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Comparing jsr166/src/main/java/util/concurrent/ConcurrentHashMap.java (file contents):
Revision 1.143 by jsr166, Fri Nov 9 03:30:03 2012 UTC vs.
Revision 1.318 by jsr166, Sat Aug 10 16:48:05 2019 UTC

#	Line 5 | Line 5
5		*/
6
7		package java.util.concurrent;
8	–	import java.util.concurrent.atomic.LongAdder;
9	–	import java.util.concurrent.ForkJoinPool;
10	–	import java.util.concurrent.ForkJoinTask;
8
9	<	import java.util.Comparator;
9	>	import java.io.ObjectStreamField;
10	>	import java.io.Serializable;
11	>	import java.lang.reflect.ParameterizedType;
12	>	import java.lang.reflect.Type;
13	>	import java.util.AbstractMap;
14		import java.util.Arrays;
14	–	import java.util.Map;
15	–	import java.util.Set;
15		import java.util.Collection;
16	<	import java.util.AbstractMap;
18	<	import java.util.AbstractSet;
19	<	import java.util.AbstractCollection;
20	<	import java.util.Hashtable;
16	>	import java.util.Enumeration;
17		import java.util.HashMap;
18	+	import java.util.Hashtable;
19		import java.util.Iterator;
20	<	import java.util.Enumeration;
24	<	import java.util.ConcurrentModificationException;
20	>	import java.util.Map;
21		import java.util.NoSuchElementException;
22	<	import java.util.concurrent.ConcurrentMap;
23	<	import java.util.concurrent.ThreadLocalRandom;
28	<	import java.util.concurrent.locks.LockSupport;
29	<	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
22	>	import java.util.Set;
23	>	import java.util.Spliterator;
24		import java.util.concurrent.atomic.AtomicReference;
25	<
26	<	import java.io.Serializable;
25	>	import java.util.concurrent.locks.LockSupport;
26	>	import java.util.concurrent.locks.ReentrantLock;
27	>	import java.util.function.BiConsumer;
28	>	import java.util.function.BiFunction;
29	>	import java.util.function.Consumer;
30	>	import java.util.function.DoubleBinaryOperator;
31	>	import java.util.function.Function;
32	>	import java.util.function.IntBinaryOperator;
33	>	import java.util.function.LongBinaryOperator;
34	>	import java.util.function.Predicate;
35	>	import java.util.function.ToDoubleBiFunction;
36	>	import java.util.function.ToDoubleFunction;
37	>	import java.util.function.ToIntBiFunction;
38	>	import java.util.function.ToIntFunction;
39	>	import java.util.function.ToLongBiFunction;
40	>	import java.util.function.ToLongFunction;
41	>	import java.util.stream.Stream;
42	>	import jdk.internal.misc.Unsafe;
43
44		/**
45		* A hash table supporting full concurrency of retrievals and
#	Line 43 | Line 53 | import java.io.Serializable;
53		* interoperable with {@code Hashtable} in programs that rely on its
54		* thread safety but not on its synchronization details.
55		*
56	<	* <p> Retrieval operations (including {@code get}) generally do not
56	>	* <p>Retrieval operations (including {@code get}) generally do not
57		* block, so may overlap with update operations (including {@code put}
58		* and {@code remove}). Retrievals reflect the results of the most
59		* recently <em>completed</em> update operations holding upon their
#	Line 52 | Line 62 | import java.io.Serializable;
62		* that key reporting the updated value.)  For aggregate operations
63		* such as {@code putAll} and {@code clear}, concurrent retrievals may
64		* reflect insertion or removal of only some entries.  Similarly,
65	<	* Iterators and Enumerations return elements reflecting the state of
66	<	* the hash table at some point at or since the creation of the
65	>	* Iterators, Spliterators and Enumerations return elements reflecting the
66	>	* state of the hash table at some point at or since the creation of the
67		* iterator/enumeration.  They do <em>not</em> throw {@link
68	<	* ConcurrentModificationException}.  However, iterators are designed
69	<	* to be used by only one thread at a time.  Bear in mind that the
70	<	* results of aggregate status methods including {@code size}, {@code
71	<	* isEmpty}, and {@code containsValue} are typically useful only when
72	<	* a map is not undergoing concurrent updates in other threads.
68	>	* java.util.ConcurrentModificationException ConcurrentModificationException}.
69	>	* However, iterators are designed to be used by only one thread at a time.
70	>	* Bear in mind that the results of aggregate status methods including
71	>	* {@code size}, {@code isEmpty}, and {@code containsValue} are typically
72	>	* useful only when a map is not undergoing concurrent updates in other threads.
73		* Otherwise the results of these methods reflect transient states
74		* that may be adequate for monitoring or estimation purposes, but not
75		* for program control.
76		*
77	<	* <p> The table is dynamically expanded when there are too many
77	>	* <p>The table is dynamically expanded when there are too many
78		* collisions (i.e., keys that have distinct hash codes but fall into
79		* the same slot modulo the table size), with the expected average
80		* effect of maintaining roughly two bins per mapping (corresponding
#	Line 83 | Line 93 | import java.io.Serializable;
93		* expected {@code concurrencyLevel} as an additional hint for
94		* internal sizing.  Note that using many keys with exactly the same
95		* {@code hashCode()} is a sure way to slow down performance of any
96	<	* hash table.
96	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
97	>	* this class may use comparison order among keys to help break ties.
98		*
99	<	* <p> A {@link Set} projection of a ConcurrentHashMap may be created
99	>	* <p>A {@link Set} projection of a ConcurrentHashMap may be created
100		* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
101		* (using {@link #keySet(Object)} when only keys are of interest, and the
102		* mapped values are (perhaps transiently) not used or all take the
103		* same mapping value.
104		*
105	<	* <p> A ConcurrentHashMap can be used as scalable frequency map (a
106	<	* form of histogram or multiset) by using {@link LongAdder} values
107	<	* and initializing via {@link #computeIfAbsent}. For example, to add
108	<	* a count to a {@code ConcurrentHashMap<String,LongAdder> freqs}, you
109	<	* can use {@code freqs.computeIfAbsent(k -> new
110	<	* LongAdder()).increment();}
105	>	* <p>A ConcurrentHashMap can be used as a scalable frequency map (a
106	>	* form of histogram or multiset) by using {@link
107	>	* java.util.concurrent.atomic.LongAdder} values and initializing via
108	>	* {@link #computeIfAbsent computeIfAbsent}. For example, to add a count
109	>	* to a {@code ConcurrentHashMap<String,LongAdder> freqs}, you can use
110	>	* {@code freqs.computeIfAbsent(key, k -> new LongAdder()).increment();}
111		*
112		* <p>This class and its views and iterators implement all of the
113		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
114		* interfaces.
115		*
116	<	* <p> Like {@link Hashtable} but unlike {@link HashMap}, this class
116	>	* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
117		* does <em>not</em> allow {@code null} to be used as a key or value.
118		*
119	<	* <p>ConcurrentHashMaps support parallel operations using the {@link
120	<	* ForkJoinPool#commonPool}. (Tasks that may be used in other contexts
121	<	* are available in class {@link ForkJoinTasks}). These operations are
122	<	* designed to be safely, and often sensibly, applied even with maps
123	<	* that are being concurrently updated by other threads; for example,
124	<	* when computing a snapshot summary of the values in a shared
125	<	* registry.  There are three kinds of operation, each with four
126	<	* forms, accepting functions with Keys, Values, Entries, and (Key,
116	<	* Value) arguments and/or return values. (The first three forms are
117	<	* also available via the {@link #keySet()}, {@link #values()} and
118	<	* {@link #entrySet()} views). Because the elements of a
119	>	* <p>ConcurrentHashMaps support a set of sequential and parallel bulk
120	>	* operations that, unlike most {@link Stream} methods, are designed
121	>	* to be safely, and often sensibly, applied even with maps that are
122	>	* being concurrently updated by other threads; for example, when
123	>	* computing a snapshot summary of the values in a shared registry.
124	>	* There are three kinds of operation, each with four forms, accepting
125	>	* functions with keys, values, entries, and (key, value) pairs as
126	>	* arguments and/or return values. Because the elements of a
127		* ConcurrentHashMap are not ordered in any particular way, and may be
128		* processed in different orders in different parallel executions, the
129		* correctness of supplied functions should not depend on any
130		* ordering, or on any other objects or values that may transiently
131		* change while computation is in progress; and except for forEach
132	<	* actions, should ideally be side-effect-free.
132	>	* actions, should ideally be side-effect-free. Bulk operations on
133	>	* {@link Map.Entry} objects do not support method {@code setValue}.
134		*
135		* <ul>
136	<	* <li> forEach: Perform a given action on each element.
136	>	* <li>forEach: Performs a given action on each element.
137		* A variant form applies a given transformation on each element
138	<	* before performing the action.</li>
138	>	* before performing the action.
139		*
140	<	* <li> search: Return the first available non-null result of
140	>	* <li>search: Returns the first available non-null result of
141		* applying a given function on each element; skipping further
142	<	* search when a result is found.</li>
142	>	* search when a result is found.
143		*
144	<	* <li> reduce: Accumulate each element.  The supplied reduction
144	>	* <li>reduce: Accumulates each element.  The supplied reduction
145		* function cannot rely on ordering (more formally, it should be
146		* both associative and commutative).  There are five variants:
147		*
148		* <ul>
149		*
150	<	* <li> Plain reductions. (There is not a form of this method for
150	>	* <li>Plain reductions. (There is not a form of this method for
151		* (key, value) function arguments since there is no corresponding
152	<	* return type.)</li>
152	>	* return type.)
153		*
154	<	* <li> Mapped reductions that accumulate the results of a given
155	<	* function applied to each element.</li>
154	>	* <li>Mapped reductions that accumulate the results of a given
155	>	* function applied to each element.
156		*
157	<	* <li> Reductions to scalar doubles, longs, and ints, using a
158	<	* given basis value.</li>
157	>	* <li>Reductions to scalar doubles, longs, and ints, using a
158	>	* given basis value.
159		*
151	–	* </li>
160		* </ul>
161		* </ul>
162		*
163	+	* <p>These bulk operations accept a {@code parallelismThreshold}
164	+	* argument. Methods proceed sequentially if the current map size is
165	+	* estimated to be less than the given threshold. Using a value of
166	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
167	+	* of {@code 1} results in maximal parallelism by partitioning into
168	+	* enough subtasks to fully utilize the {@link
169	+	* ForkJoinPool#commonPool()} that is used for all parallel
170	+	* computations. Normally, you would initially choose one of these
171	+	* extreme values, and then measure performance of using in-between
172	+	* values that trade off overhead versus throughput.
173	+	*
174		* <p>The concurrency properties of bulk operations follow
175		* from those of ConcurrentHashMap: Any non-null result returned
176		* from {@code get(key)} and related access methods bears a
#	Line 187 | Line 206 | import java.io.Serializable;
206		* arguments can be supplied using {@code new
207		* AbstractMap.SimpleEntry(k,v)}.
208		*
209	<	* <p> Bulk operations may complete abruptly, throwing an
209	>	* <p>Bulk operations may complete abruptly, throwing an
210		* exception encountered in the application of a supplied
211		* function. Bear in mind when handling such exceptions that other
212		* concurrently executing functions could also have thrown
213		* exceptions, or would have done so if the first exception had
214		* not occurred.
215		*
216	<	* <p>Parallel speedups for bulk operations compared to sequential
217	<	* processing are common but not guaranteed.  Operations involving
218	<	* brief functions on small maps may execute more slowly than
219	<	* sequential loops if the underlying work to parallelize the
220	<	* computation is more expensive than the computation itself.
221	<	* Similarly, parallelization may not lead to much actual parallelism
222	<	* if all processors are busy performing unrelated tasks.
216	>	* <p>Speedups for parallel compared to sequential forms are common
217	>	* but not guaranteed.  Parallel operations involving brief functions
218	>	* on small maps may execute more slowly than sequential forms if the
219	>	* underlying work to parallelize the computation is more expensive
220	>	* than the computation itself.  Similarly, parallelization may not
221	>	* lead to much actual parallelism if all processors are busy
222	>	* performing unrelated tasks.
223		*
224	<	* <p> All arguments to all task methods must be non-null.
206	<	*
207	<	* <p><em>jsr166e note: During transition, this class
208	<	* uses nested functional interfaces with different names but the
209	<	* same forms as those expected for JDK8.<em>
224	>	* <p>All arguments to all task methods must be non-null.
225		*
226		* <p>This class is a member of the
227	<	* <a href="{@docRoot}/../technotes/guides/collections/index.html">
227	>	* <a href="{@docRoot}/java.base/java/util/package-summary.html#CollectionsFramework">
228		* Java Collections Framework</a>.
229		*
230		* @since 1.5
#	Line 217 | Line 232 | import java.io.Serializable;
232		* @param <K> the type of keys maintained by this map
233		* @param <V> the type of mapped values
234		*/
235	<	public class ConcurrentHashMap<K, V>
236	<	implements ConcurrentMap<K, V>, Serializable {
235	>	public class ConcurrentHashMap<K,V> extends AbstractMap<K,V>
236	>	implements ConcurrentMap<K,V>, Serializable {
237		private static final long serialVersionUID = 7249069246763182397L;
238
224	–	/**
225	–	* A partitionable iterator. A Spliterator can be traversed
226	–	* directly, but can also be partitioned (before traversal) by
227	–	* creating another Spliterator that covers a non-overlapping
228	–	* portion of the elements, and so may be amenable to parallel
229	–	* execution.
230	–	*
231	–	* <p> This interface exports a subset of expected JDK8
232	–	* functionality.
233	–	*
234	–	* <p>Sample usage: Here is one (of the several) ways to compute
235	–	* the sum of the values held in a map using the ForkJoin
236	–	* framework. As illustrated here, Spliterators are well suited to
237	–	* designs in which a task repeatedly splits off half its work
238	–	* into forked subtasks until small enough to process directly,
239	–	* and then joins these subtasks. Variants of this style can also
240	–	* be used in completion-based designs.
241	–	*
242	–	* <pre>
243	–	* {@code ConcurrentHashMap<String, Long> m = ...
244	–	* // split as if have 8 * parallelism, for load balance
245	–	* int n = m.size();
246	–	* int p = aForkJoinPool.getParallelism() * 8;
247	–	* int split = (n < p)? n : p;
248	–	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
249	–	* // ...
250	–	* static class SumValues extends RecursiveTask<Long> {
251	–	*   final Spliterator<Long> s;
252	–	*   final int split;             // split while > 1
253	–	*   final SumValues nextJoin;    // records forked subtasks to join
254	–	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
255	–	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
256	–	*   }
257	–	*   public Long compute() {
258	–	*     long sum = 0;
259	–	*     SumValues subtasks = null; // fork subtasks
260	–	*     for (int s = split >>> 1; s > 0; s >>>= 1)
261	–	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
262	–	*     while (s.hasNext())        // directly process remaining elements
263	–	*       sum += s.next();
264	–	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
265	–	*       sum += t.join();         // collect subtask results
266	–	*     return sum;
267	–	*   }
268	–	* }
269	–	* }</pre>
270	–	*/
271	–	public static interface Spliterator<T> extends Iterator<T> {
272	–	/**
273	–	* Returns a Spliterator covering approximately half of the
274	–	* elements, guaranteed not to overlap with those subsequently
275	–	* returned by this Spliterator.  After invoking this method,
276	–	* the current Spliterator will <em>not</em> produce any of
277	–	* the elements of the returned Spliterator, but the two
278	–	* Spliterators together will produce all of the elements that
279	–	* would have been produced by this Spliterator had this
280	–	* method not been called. The exact number of elements
281	–	* produced by the returned Spliterator is not guaranteed, and
282	–	* may be zero (i.e., with {@code hasNext()} reporting {@code
283	–	* false}) if this Spliterator cannot be further split.
284	–	*
285	–	* @return a Spliterator covering approximately half of the
286	–	* elements
287	–	* @throws IllegalStateException if this Spliterator has
288	–	* already commenced traversing elements
289	–	*/
290	–	Spliterator<T> split();
291	–	}
292	–
293	–
239		/*
240		* Overview:
241		*
#	Line 301 | Line 246 | public class ConcurrentHashMap<K, V>
246		* the same or better than java.util.HashMap, and to support high
247		* initial insertion rates on an empty table by many threads.
248		*
249	<	* Each key-value mapping is held in a Node.  Because Node fields
250	<	* can contain special values, they are defined using plain Object
251	<	* types. Similarly in turn, all internal methods that use them
252	<	* work off Object types. And similarly, so do the internal
253	<	* methods of auxiliary iterator and view classes.  All public
254	<	* generic typed methods relay in/out of these internal methods,
255	<	* supplying null-checks and casts as needed. This also allows
256	<	* many of the public methods to be factored into a smaller number
257	<	* of internal methods (although sadly not so for the five
258	<	* variants of put-related operations). The validation-based
259	<	* approach explained below leads to a lot of code sprawl because
260	<	* retry-control precludes factoring into smaller methods.
249	>	* This map usually acts as a binned (bucketed) hash table.  Each
250	>	* key-value mapping is held in a Node.  Most nodes are instances
251	>	* of the basic Node class with hash, key, value, and next
252	>	* fields. However, various subclasses exist: TreeNodes are
253	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
254	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
255	>	* of bins during resizing. ReservationNodes are used as
256	>	* placeholders while establishing values in computeIfAbsent and
257	>	* related methods.  The types TreeBin, ForwardingNode, and
258	>	* ReservationNode do not hold normal user keys, values, or
259	>	* hashes, and are readily distinguishable during search etc
260	>	* because they have negative hash fields and null key and value
261	>	* fields. (These special nodes are either uncommon or transient,
262	>	* so the impact of carrying around some unused fields is
263	>	* insignificant.)
264		*
265		* The table is lazily initialized to a power-of-two size upon the
266		* first insertion.  Each bin in the table normally contains a
#	Line 320 | Line 268 | public class ConcurrentHashMap<K, V>
268		* Table accesses require volatile/atomic reads, writes, and
269		* CASes.  Because there is no other way to arrange this without
270		* adding further indirections, we use intrinsics
271	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
272	<	* are always accurately traversable under volatile reads, so long
273	<	* as lookups check hash code and non-nullness of value before
274	<	* checking key equality.
275	<	*
276	<	* We use the top two bits of Node hash fields for control
329	<	* purposes -- they are available anyway because of addressing
330	<	* constraints.  As explained further below, these top bits are
331	<	* used as follows:
332	<	*  00 - Normal
333	<	*  01 - Locked
334	<	*  11 - Locked and may have a thread waiting for lock
335	<	*  10 - Node is a forwarding node
336	<	*
337	<	* The lower 30 bits of each Node's hash field contain a
338	<	* transformation of the key's hash code, except for forwarding
339	<	* nodes, for which the lower bits are zero (and so always have
340	<	* hash field == MOVED).
271	>	* (jdk.internal.misc.Unsafe) operations.
272	>	*
273	>	* We use the top (sign) bit of Node hash fields for control
274	>	* purposes -- it is available anyway because of addressing
275	>	* constraints.  Nodes with negative hash fields are specially
276	>	* handled or ignored in map methods.
277		*
278		* Insertion (via put or its variants) of the first node in an
279		* empty bin is performed by just CASing it to the bin.  This is
#	Line 346 | Line 282 | public class ConcurrentHashMap<K, V>
282		* delete, and replace) require locks.  We do not want to waste
283		* the space required to associate a distinct lock object with
284		* each bin, so instead use the first node of a bin list itself as
285	<	* a lock. Blocking support for these locks relies on the builtin
286	<	* "synchronized" monitors.  However, we also need a tryLock
351	<	* construction, so we overlay these by using bits of the Node
352	<	* hash field for lock control (see above), and so normally use
353	<	* builtin monitors only for blocking and signalling using
354	<	* wait/notifyAll constructions. See Node.tryAwaitLock.
285	>	* a lock. Locking support for these locks relies on builtin
286	>	* "synchronized" monitors.
287		*
288		* Using the first node of a list as a lock does not by itself
289		* suffice though: When a node is locked, any update must first
290		* validate that it is still the first node after locking it, and
291		* retry if not. Because new nodes are always appended to lists,
292		* once a node is first in a bin, it remains first until deleted
293	<	* or the bin becomes invalidated (upon resizing).  However,
362	<	* operations that only conditionally update may inspect nodes
363	<	* until the point of update. This is a converse of sorts to the
364	<	* lazy locking technique described by Herlihy & Shavit.
293	>	* or the bin becomes invalidated (upon resizing).
294		*
295		* The main disadvantage of per-bin locks is that other update
296		* operations on other nodes in a bin list protected by the same
#	Line 394 | Line 323 | public class ConcurrentHashMap<K, V>
323		* sometimes deviate significantly from uniform randomness.  This
324		* includes the case when N > (1<<30), so some keys MUST collide.
325		* Similarly for dumb or hostile usages in which multiple keys are
326	<	* designed to have identical hash codes. Also, although we guard
327	<	* against the worst effects of this (see method spread), sets of
328	<	* hashes may differ only in bits that do not impact their bin
329	<	* index for a given power-of-two mask.  So we use a secondary
330	<	* strategy that applies when the number of nodes in a bin exceeds
331	<	* a threshold, and at least one of the keys implements
403	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
404	<	* (a specialized form of red-black trees), bounding search time
405	<	* to O(log N).  Each search step in a TreeBin is around twice as
326	>	* designed to have identical hash codes or ones that differs only
327	>	* in masked-out high bits. So we use a secondary strategy that
328	>	* applies when the number of nodes in a bin exceeds a
329	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
330	>	* specialized form of red-black trees), bounding search time to
331	>	* O(log N).  Each search step in a TreeBin is at least twice as
332		* slow as in a regular list, but given that N cannot exceed
333		* (1<<64) (before running out of addresses) this bounds search
334		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 413 | Line 339 | public class ConcurrentHashMap<K, V>
339		* iterators in the same way.
340		*
341		* The table is resized when occupancy exceeds a percentage
342	<	* threshold (nominally, 0.75, but see below).  Only a single
343	<	* thread performs the resize (using field "sizeCtl", to arrange
344	<	* exclusion), but the table otherwise remains usable for reads
345	<	* and updates. Resizing proceeds by transferring bins, one by
346	<	* one, from the table to the next table.  Because we are using
347	<	* power-of-two expansion, the elements from each bin must either
348	<	* stay at same index, or move with a power of two offset. We
349	<	* eliminate unnecessary node creation by catching cases where old
350	<	* nodes can be reused because their next fields won't change.  On
351	<	* average, only about one-sixth of them need cloning when a table
352	<	* doubles. The nodes they replace will be garbage collectable as
353	<	* soon as they are no longer referenced by any reader thread that
354	<	* may be in the midst of concurrently traversing table.  Upon
355	<	* transfer, the old table bin contains only a special forwarding
356	<	* node (with hash field "MOVED") that contains the next table as
357	<	* its key. On encountering a forwarding node, access and update
358	<	* operations restart, using the new table.
359	<	*
360	<	* Each bin transfer requires its bin lock. However, unlike other
361	<	* cases, a transfer can skip a bin if it fails to acquire its
362	<	* lock, and revisit it later (unless it is a TreeBin). Method
363	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
364	<	* have been skipped because of failure to acquire a lock, and
365	<	* blocks only if none are available (i.e., only very rarely).
366	<	* The transfer operation must also ensure that all accessible
367	<	* bins in both the old and new table are usable by any traversal.
368	<	* When there are no lock acquisition failures, this is arranged
369	<	* simply by proceeding from the last bin (table.length - 1) up
370	<	* towards the first.  Upon seeing a forwarding node, traversals
371	<	* (see class Iter) arrange to move to the new table
372	<	* without revisiting nodes.  However, when any node is skipped
373	<	* during a transfer, all earlier table bins may have become
374	<	* visible, so are initialized with a reverse-forwarding node back
375	<	* to the old table until the new ones are established. (This
376	<	* sometimes requires transiently locking a forwarding node, which
377	<	* is possible under the above encoding.) These more expensive
378	<	* mechanics trigger only when necessary.
342	>	* threshold (nominally, 0.75, but see below).  Any thread
343	>	* noticing an overfull bin may assist in resizing after the
344	>	* initiating thread allocates and sets up the replacement array.
345	>	* However, rather than stalling, these other threads may proceed
346	>	* with insertions etc.  The use of TreeBins shields us from the
347	>	* worst case effects of overfilling while resizes are in
348	>	* progress.  Resizing proceeds by transferring bins, one by one,
349	>	* from the table to the next table. However, threads claim small
350	>	* blocks of indices to transfer (via field transferIndex) before
351	>	* doing so, reducing contention.  A generation stamp in field
352	>	* sizeCtl ensures that resizings do not overlap. Because we are
353	>	* using power-of-two expansion, the elements from each bin must
354	>	* either stay at same index, or move with a power of two
355	>	* offset. We eliminate unnecessary node creation by catching
356	>	* cases where old nodes can be reused because their next fields
357	>	* won't change.  On average, only about one-sixth of them need
358	>	* cloning when a table doubles. The nodes they replace will be
359	>	* garbage collectible as soon as they are no longer referenced by
360	>	* any reader thread that may be in the midst of concurrently
361	>	* traversing table.  Upon transfer, the old table bin contains
362	>	* only a special forwarding node (with hash field "MOVED") that
363	>	* contains the next table as its key. On encountering a
364	>	* forwarding node, access and update operations restart, using
365	>	* the new table.
366	>	*
367	>	* Each bin transfer requires its bin lock, which can stall
368	>	* waiting for locks while resizing. However, because other
369	>	* threads can join in and help resize rather than contend for
370	>	* locks, average aggregate waits become shorter as resizing
371	>	* progresses.  The transfer operation must also ensure that all
372	>	* accessible bins in both the old and new table are usable by any
373	>	* traversal.  This is arranged in part by proceeding from the
374	>	* last bin (table.length - 1) up towards the first.  Upon seeing
375	>	* a forwarding node, traversals (see class Traverser) arrange to
376	>	* move to the new table without revisiting nodes.  To ensure that
377	>	* no intervening nodes are skipped even when moved out of order,
378	>	* a stack (see class TableStack) is created on first encounter of
379	>	* a forwarding node during a traversal, to maintain its place if
380	>	* later processing the current table. The need for these
381	>	* save/restore mechanics is relatively rare, but when one
382	>	* forwarding node is encountered, typically many more will be.
383	>	* So Traversers use a simple caching scheme to avoid creating so
384	>	* many new TableStack nodes. (Thanks to Peter Levart for
385	>	* suggesting use of a stack here.)
386		*
387		* The traversal scheme also applies to partial traversals of
388		* ranges of bins (via an alternate Traverser constructor)
#	Line 464 | Line 397 | public class ConcurrentHashMap<K, V>
397		* These cases attempt to override the initial capacity settings,
398		* but harmlessly fail to take effect in cases of races.
399		*
400	<	* The element count is maintained using a LongAdder, which avoids
401	<	* contention on updates but can encounter cache thrashing if read
402	<	* too frequently during concurrent access. To avoid reading so
403	<	* often, resizing is attempted either when a bin lock is
404	<	* contended, or upon adding to a bin already holding two or more
405	<	* nodes (checked before adding in the xIfAbsent methods, after
406	<	* adding in others). Under uniform hash distributions, the
407	<	* probability of this occurring at threshold is around 13%,
408	<	* meaning that only about 1 in 8 puts check threshold (and after
409	<	* resizing, many fewer do so). But this approximation has high
410	<	* variance for small table sizes, so we check on any collision
411	<	* for sizes <= 64. The bulk putAll operation further reduces
412	<	* contention by only committing count updates upon these size
413	<	* checks.
400	>	* The element count is maintained using a specialization of
401	>	* LongAdder. We need to incorporate a specialization rather than
402	>	* just use a LongAdder in order to access implicit
403	>	* contention-sensing that leads to creation of multiple
404	>	* CounterCells.  The counter mechanics avoid contention on
405	>	* updates but can encounter cache thrashing if read too
406	>	* frequently during concurrent access. To avoid reading so often,
407	>	* resizing under contention is attempted only upon adding to a
408	>	* bin already holding two or more nodes. Under uniform hash
409	>	* distributions, the probability of this occurring at threshold
410	>	* is around 13%, meaning that only about 1 in 8 puts check
411	>	* threshold (and after resizing, many fewer do so).
412	>	*
413	>	* TreeBins use a special form of comparison for search and
414	>	* related operations (which is the main reason we cannot use
415	>	* existing collections such as TreeMaps). TreeBins contain
416	>	* Comparable elements, but may contain others, as well as
417	>	* elements that are Comparable but not necessarily Comparable for
418	>	* the same T, so we cannot invoke compareTo among them. To handle
419	>	* this, the tree is ordered primarily by hash value, then by
420	>	* Comparable.compareTo order if applicable.  On lookup at a node,
421	>	* if elements are not comparable or compare as 0 then both left
422	>	* and right children may need to be searched in the case of tied
423	>	* hash values. (This corresponds to the full list search that
424	>	* would be necessary if all elements were non-Comparable and had
425	>	* tied hashes.) On insertion, to keep a total ordering (or as
426	>	* close as is required here) across rebalancings, we compare
427	>	* classes and identityHashCodes as tie-breakers. The red-black
428	>	* balancing code is updated from pre-jdk-collections
429	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
430	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
431	>	* Algorithms" (CLR).
432	>	*
433	>	* TreeBins also require an additional locking mechanism.  While
434	>	* list traversal is always possible by readers even during
435	>	* updates, tree traversal is not, mainly because of tree-rotations
436	>	* that may change the root node and/or its linkages.  TreeBins
437	>	* include a simple read-write lock mechanism parasitic on the
438	>	* main bin-synchronization strategy: Structural adjustments
439	>	* associated with an insertion or removal are already bin-locked
440	>	* (and so cannot conflict with other writers) but must wait for
441	>	* ongoing readers to finish. Since there can be only one such
442	>	* waiter, we use a simple scheme using a single "waiter" field to
443	>	* block writers.  However, readers need never block.  If the root
444	>	* lock is held, they proceed along the slow traversal path (via
445	>	* next-pointers) until the lock becomes available or the list is
446	>	* exhausted, whichever comes first. These cases are not fast, but
447	>	* maximize aggregate expected throughput.
448		*
449		* Maintaining API and serialization compatibility with previous
450		* versions of this class introduces several oddities. Mainly: We
451	<	* leave untouched but unused constructor arguments refering to
451	>	* leave untouched but unused constructor arguments referring to
452		* concurrencyLevel. We accept a loadFactor constructor argument,
453		* but apply it only to initial table capacity (which is the only
454		* time that we can guarantee to honor it.) We also declare an
455		* unused "Segment" class that is instantiated in minimal form
456		* only when serializing.
457	+	*
458	+	* Also, solely for compatibility with previous versions of this
459	+	* class, it extends AbstractMap, even though all of its methods
460	+	* are overridden, so it is just useless baggage.
461	+	*
462	+	* This file is organized to make things a little easier to follow
463	+	* while reading than they might otherwise: First the main static
464	+	* declarations and utilities, then fields, then main public
465	+	* methods (with a few factorings of multiple public methods into
466	+	* internal ones), then sizing methods, trees, traversers, and
467	+	* bulk operations.
468		*/
469
470		/* ---------------- Constants -------------- */
#	Line 528 | Line 506 | public class ConcurrentHashMap<K, V>
506		private static final float LOAD_FACTOR = 0.75f;
507
508		/**
509	<	* The buffer size for skipped bins during transfers. The
510	<	* value is arbitrary but should be large enough to avoid
511	<	* most locking stalls during resizes.
509	>	* The bin count threshold for using a tree rather than list for a
510	>	* bin.  Bins are converted to trees when adding an element to a
511	>	* bin with at least this many nodes. The value must be greater
512	>	* than 2, and should be at least 8 to mesh with assumptions in
513	>	* tree removal about conversion back to plain bins upon
514	>	* shrinkage.
515		*/
516	<	private static final int TRANSFER_BUFFER_SIZE = 32;
516	>	static final int TREEIFY_THRESHOLD = 8;
517
518		/**
519	<	* The bin count threshold for using a tree rather than list for a
520	<	* bin.  The value reflects the approximate break-even point for
521	<	* using tree-based operations.
519	>	* The bin count threshold for untreeifying a (split) bin during a
520	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
521	>	* most 6 to mesh with shrinkage detection under removal.
522		*/
523	<	private static final int TREE_THRESHOLD = 8;
523	>	static final int UNTREEIFY_THRESHOLD = 6;
524
525	<	/*
526	<	* Encodings for special uses of Node hash fields. See above for
527	<	* explanation.
525	>	/**
526	>	* The smallest table capacity for which bins may be treeified.
527	>	* (Otherwise the table is resized if too many nodes in a bin.)
528	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
529	>	* conflicts between resizing and treeification thresholds.
530		*/
531	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
549	<	static final int LOCKED    = 0x40000000; // set/tested only as a bit
550	<	static final int WAITING   = 0xc0000000; // both bits set/tested together
551	<	static final int HASH_BITS = 0x3fffffff; // usable bits of normal node hash
552	<
553	<	/* ---------------- Fields -------------- */
531	>	static final int MIN_TREEIFY_CAPACITY = 64;
532
533		/**
534	<	* The array of bins. Lazily initialized upon first insertion.
535	<	* Size is always a power of two. Accessed directly by iterators.
534	>	* Minimum number of rebinnings per transfer step. Ranges are
535	>	* subdivided to allow multiple resizer threads.  This value
536	>	* serves as a lower bound to avoid resizers encountering
537	>	* excessive memory contention.  The value should be at least
538	>	* DEFAULT_CAPACITY.
539		*/
540	<	transient volatile Node[] table;
540	>	private static final int MIN_TRANSFER_STRIDE = 16;
541
542		/**
543	<	* The counter maintaining number of elements.
543	>	* The number of bits used for generation stamp in sizeCtl.
544	>	* Must be at least 6 for 32bit arrays.
545		*/
546	<	private transient final LongAdder counter;
546	>	private static final int RESIZE_STAMP_BITS = 16;
547
548		/**
549	<	* Table initialization and resizing control.  When negative, the
550	<	* table is being initialized or resized. Otherwise, when table is
569	<	* null, holds the initial table size to use upon creation, or 0
570	<	* for default. After initialization, holds the next element count
571	<	* value upon which to resize the table.
549	>	* The maximum number of threads that can help resize.
550	>	* Must fit in 32 - RESIZE_STAMP_BITS bits.
551		*/
552	<	private transient volatile int sizeCtl;
574	<
575	<	// views
576	<	private transient KeySetView<K,V> keySet;
577	<	private transient ValuesView<K,V> values;
578	<	private transient EntrySetView<K,V> entrySet;
552	>	private static final int MAX_RESIZERS = (1 << (32 - RESIZE_STAMP_BITS)) - 1;
553
554	<	/** For serialization compatibility. Null unless serialized; see below */
555	<	private Segment<K,V>[] segments;
556	<
557	<	/* ---------------- Table element access -------------- */
554	>	/**
555	>	* The bit shift for recording size stamp in sizeCtl.
556	>	*/
557	>	private static final int RESIZE_STAMP_SHIFT = 32 - RESIZE_STAMP_BITS;
558
559		/*
560	<	* Volatile access methods are used for table elements as well as
587	<	* elements of in-progress next table while resizing.  Uses are
588	<	* null checked by callers, and implicitly bounds-checked, relying
589	<	* on the invariants that tab arrays have non-zero size, and all
590	<	* indices are masked with (tab.length - 1) which is never
591	<	* negative and always less than length. Note that, to be correct
592	<	* wrt arbitrary concurrency errors by users, bounds checks must
593	<	* operate on local variables, which accounts for some odd-looking
594	<	* inline assignments below.
560	>	* Encodings for Node hash fields. See above for explanation.
561		*/
562	<
563	<	static final Node tabAt(Node[] tab, int i) { // used by Iter
564	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
565	<	}
566	<
567	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
568	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
569	<	}
570	<
571	<	private static final void setTabAt(Node[] tab, int i, Node v) {
572	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
573	<	}
562	>	static final int MOVED     = -1; // hash for forwarding nodes
563	>	static final int TREEBIN   = -2; // hash for roots of trees
564	>	static final int RESERVED  = -3; // hash for transient reservations
565	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
566	>
567	>	/** Number of CPUS, to place bounds on some sizings */
568	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
569	>
570	>	/**
571	>	* Serialized pseudo-fields, provided only for jdk7 compatibility.
572	>	* @serialField segments Segment[]
573	>	*   The segments, each of which is a specialized hash table.
574	>	* @serialField segmentMask int
575	>	*   Mask value for indexing into segments. The upper bits of a
576	>	*   key's hash code are used to choose the segment.
577	>	* @serialField segmentShift int
578	>	*   Shift value for indexing within segments.
579	>	*/
580	>	private static final ObjectStreamField[] serialPersistentFields = {
581	>	new ObjectStreamField("segments", Segment[].class),
582	>	new ObjectStreamField("segmentMask", Integer.TYPE),
583	>	new ObjectStreamField("segmentShift", Integer.TYPE),
584	>	};
585
586		/* ---------------- Nodes -------------- */
587
588		/**
589	<	* Key-value entry. Note that this is never exported out as a
590	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
591	<	* field of MOVED are special, and do not contain user keys or
592	<	* values.  Otherwise, keys are never null, and null val fields
593	<	* indicate that a node is in the process of being deleted or
594	<	* created. For purposes of read-only access, a key may be read
595	<	* before a val, but can only be used after checking val to be
596	<	* non-null.
597	<	*/
598	<	static class Node {
599	<	volatile int hash;
600	<	final Object key;
624	<	volatile Object val;
625	<	volatile Node next;
589	>	* Key-value entry.  This class is never exported out as a
590	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
591	>	* MapEntry below), but can be used for read-only traversals used
592	>	* in bulk tasks.  Subclasses of Node with a negative hash field
593	>	* are special, and contain null keys and values (but are never
594	>	* exported).  Otherwise, keys and vals are never null.
595	>	*/
596	>	static class Node<K,V> implements Map.Entry<K,V> {
597	>	final int hash;
598	>	final K key;
599	>	volatile V val;
600	>	volatile Node<K,V> next;
601
602	<	Node(int hash, Object key, Object val, Node next) {
602	>	Node(int hash, K key, V val) {
603		this.hash = hash;
604		this.key = key;
605		this.val = val;
631	–	this.next = next;
632	–	}
633	–
634	–	/** CompareAndSet the hash field */
635	–	final boolean casHash(int cmp, int val) {
636	–	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
637	–	}
638	–
639	–	/** The number of spins before blocking for a lock */
640	–	static final int MAX_SPINS =
641	–	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
642	–
643	–	/**
644	–	* Spins a while if LOCKED bit set and this node is the first
645	–	* of its bin, and then sets WAITING bits on hash field and
646	–	* blocks (once) if they are still set.  It is OK for this
647	–	* method to return even if lock is not available upon exit,
648	–	* which enables these simple single-wait mechanics.
649	–	*
650	–	* The corresponding signalling operation is performed within
651	–	* callers: Upon detecting that WAITING has been set when
652	–	* unlocking lock (via a failed CAS from non-waiting LOCKED
653	–	* state), unlockers acquire the sync lock and perform a
654	–	* notifyAll.
655	–	*
656	–	* The initial sanity check on tab and bounds is not currently
657	–	* necessary in the only usages of this method, but enables
658	–	* use in other future contexts.
659	–	*/
660	–	final void tryAwaitLock(Node[] tab, int i) {
661	–	if (tab != null && i >= 0 && i < tab.length) { // sanity check
662	–	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
663	–	int spins = MAX_SPINS, h;
664	–	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
665	–	if (spins >= 0) {
666	–	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
667	–	if (r >= 0 && --spins == 0)
668	–	Thread.yield();  // yield before block
669	–	}
670	–	else if (casHash(h, h | WAITING)) {
671	–	synchronized (this) {
672	–	if (tabAt(tab, i) == this &&
673	–	(hash & WAITING) == WAITING) {
674	–	try {
675	–	wait();
676	–	} catch (InterruptedException ie) {
677	–	try {
678	–	Thread.currentThread().interrupt();
679	–	} catch (SecurityException ignore) {
680	–	}
681	–	}
682	–	}
683	–	else
684	–	notifyAll(); // possibly won race vs signaller
685	–	}
686	–	break;
687	–	}
688	–	}
689	–	}
690	–	}
691	–
692	–	// Unsafe mechanics for casHash
693	–	private static final sun.misc.Unsafe UNSAFE;
694	–	private static final long hashOffset;
695	–
696	–	static {
697	–	try {
698	–	UNSAFE = sun.misc.Unsafe.getUnsafe();
699	–	Class<?> k = Node.class;
700	–	hashOffset = UNSAFE.objectFieldOffset
701	–	(k.getDeclaredField("hash"));
702	–	} catch (Exception e) {
703	–	throw new Error(e);
704	–	}
606		}
706	–	}
707	–
708	–	/* ---------------- TreeBins -------------- */
709	–
710	–	/**
711	–	* Nodes for use in TreeBins
712	–	*/
713	–	static final class TreeNode extends Node {
714	–	TreeNode parent;  // red-black tree links
715	–	TreeNode left;
716	–	TreeNode right;
717	–	TreeNode prev;    // needed to unlink next upon deletion
718	–	boolean red;
607
608	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
609	<	super(hash, key, val, next);
610	<	this.parent = parent;
723	<	}
724	<	}
725	<
726	<	/**
727	<	* A specialized form of red-black tree for use in bins
728	<	* whose size exceeds a threshold.
729	<	*
730	<	* TreeBins use a special form of comparison for search and
731	<	* related operations (which is the main reason we cannot use
732	<	* existing collections such as TreeMaps). TreeBins contain
733	<	* Comparable elements, but may contain others, as well as
734	<	* elements that are Comparable but not necessarily Comparable<T>
735	<	* for the same T, so we cannot invoke compareTo among them. To
736	<	* handle this, the tree is ordered primarily by hash value, then
737	<	* by getClass().getName() order, and then by Comparator order
738	<	* among elements of the same class.  On lookup at a node, if
739	<	* elements are not comparable or compare as 0, both left and
740	<	* right children may need to be searched in the case of tied hash
741	<	* values. (This corresponds to the full list search that would be
742	<	* necessary if all elements were non-Comparable and had tied
743	<	* hashes.)  The red-black balancing code is updated from
744	<	* pre-jdk-collections
745	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
746	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
747	<	* Algorithms" (CLR).
748	<	*
749	<	* TreeBins also maintain a separate locking discipline than
750	<	* regular bins. Because they are forwarded via special MOVED
751	<	* nodes at bin heads (which can never change once established),
752	<	* we cannot use those nodes as locks. Instead, TreeBin
753	<	* extends AbstractQueuedSynchronizer to support a simple form of
754	<	* read-write lock. For update operations and table validation,
755	<	* the exclusive form of lock behaves in the same way as bin-head
756	<	* locks. However, lookups use shared read-lock mechanics to allow
757	<	* multiple readers in the absence of writers.  Additionally,
758	<	* these lookups do not ever block: While the lock is not
759	<	* available, they proceed along the slow traversal path (via
760	<	* next-pointers) until the lock becomes available or the list is
761	<	* exhausted, whichever comes first. (These cases are not fast,
762	<	* but maximize aggregate expected throughput.)  The AQS mechanics
763	<	* for doing this are straightforward.  The lock state is held as
764	<	* AQS getState().  Read counts are negative; the write count (1)
765	<	* is positive.  There are no signalling preferences among readers
766	<	* and writers. Since we don't need to export full Lock API, we
767	<	* just override the minimal AQS methods and use them directly.
768	<	*/
769	<	static final class TreeBin extends AbstractQueuedSynchronizer {
770	<	private static final long serialVersionUID = 2249069246763182397L;
771	<	transient TreeNode root;  // root of tree
772	<	transient TreeNode first; // head of next-pointer list
773	<
774	<	/* AQS overrides */
775	<	public final boolean isHeldExclusively() { return getState() > 0; }
776	<	public final boolean tryAcquire(int ignore) {
777	<	if (compareAndSetState(0, 1)) {
778	<	setExclusiveOwnerThread(Thread.currentThread());
779	<	return true;
780	<	}
781	<	return false;
782	<	}
783	<	public final boolean tryRelease(int ignore) {
784	<	setExclusiveOwnerThread(null);
785	<	setState(0);
786	<	return true;
787	<	}
788	<	public final int tryAcquireShared(int ignore) {
789	<	for (int c;;) {
790	<	if ((c = getState()) > 0)
791	<	return -1;
792	<	if (compareAndSetState(c, c -1))
793	<	return 1;
794	<	}
795	<	}
796	<	public final boolean tryReleaseShared(int ignore) {
797	<	int c;
798	<	do {} while (!compareAndSetState(c = getState(), c + 1));
799	<	return c == -1;
800	<	}
801	<
802	<	/** From CLR */
803	<	private void rotateLeft(TreeNode p) {
804	<	if (p != null) {
805	<	TreeNode r = p.right, pp, rl;
806	<	if ((rl = p.right = r.left) != null)
807	<	rl.parent = p;
808	<	if ((pp = r.parent = p.parent) == null)
809	<	root = r;
810	<	else if (pp.left == p)
811	<	pp.left = r;
812	<	else
813	<	pp.right = r;
814	<	r.left = p;
815	<	p.parent = r;
816	<	}
608	>	Node(int hash, K key, V val, Node<K,V> next) {
609	>	this(hash, key, val);
610	>	this.next = next;
611		}
612
613	<	/** From CLR */
614	<	private void rotateRight(TreeNode p) {
615	<	if (p != null) {
616	<	TreeNode l = p.left, pp, lr;
617	<	if ((lr = p.left = l.right) != null)
824	<	lr.parent = p;
825	<	if ((pp = l.parent = p.parent) == null)
826	<	root = l;
827	<	else if (pp.right == p)
828	<	pp.right = l;
829	<	else
830	<	pp.left = l;
831	<	l.right = p;
832	<	p.parent = l;
833	<	}
613	>	public final K getKey()     { return key; }
614	>	public final V getValue()   { return val; }
615	>	public final int hashCode() { return key.hashCode() ^ val.hashCode(); }
616	>	public final String toString() {
617	>	return Helpers.mapEntryToString(key, val);
618		}
619	<
620	<	/**
837	<	* Returns the TreeNode (or null if not found) for the given key
838	<	* starting at given root.
839	<	*/
840	<	@SuppressWarnings("unchecked") final TreeNode getTreeNode
841	<	(int h, Object k, TreeNode p) {
842	<	Class<?> c = k.getClass();
843	<	while (p != null) {
844	<	int dir, ph;  Object pk; Class<?> pc;
845	<	if ((ph = p.hash) == h) {
846	<	if ((pk = p.key) == k || k.equals(pk))
847	<	return p;
848	<	if (c != (pc = pk.getClass()) ||
849	<	!(k instanceof Comparable) ||
850	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
851	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
852	<	TreeNode r = null, s = null, pl, pr;
853	<	if (dir >= 0) {
854	<	if ((pl = p.left) != null && h <= pl.hash)
855	<	s = pl;
856	<	}
857	<	else if ((pr = p.right) != null && h >= pr.hash)
858	<	s = pr;
859	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
860	<	return r;
861	<	}
862	<	}
863	<	else
864	<	dir = (h < ph) ? -1 : 1;
865	<	p = (dir > 0) ? p.right : p.left;
866	<	}
867	<	return null;
619	>	public final V setValue(V value) {
620	>	throw new UnsupportedOperationException();
621		}
622
623	<	/**
624	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
625	<	* read-lock to call getTreeNode, but during failure to get
626	<	* lock, searches along next links.
627	<	*/
628	<	final Object getValue(int h, Object k) {
629	<	Node r = null;
877	<	int c = getState(); // Must read lock state first
878	<	for (Node e = first; e != null; e = e.next) {
879	<	if (c <= 0 && compareAndSetState(c, c - 1)) {
880	<	try {
881	<	r = getTreeNode(h, k, root);
882	<	} finally {
883	<	releaseShared(0);
884	<	}
885	<	break;
886	<	}
887	<	else if ((e.hash & HASH_BITS) == h && k.equals(e.key)) {
888	<	r = e;
889	<	break;
890	<	}
891	<	else
892	<	c = getState();
893	<	}
894	<	return r == null ? null : r.val;
623	>	public final boolean equals(Object o) {
624	>	Object k, v, u; Map.Entry<?,?> e;
625	>	return ((o instanceof Map.Entry) &&
626	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
627	>	(v = e.getValue()) != null &&
628	>	(k == key || k.equals(key)) &&
629	>	(v == (u = val) || v.equals(u)));
630		}
631
632		/**
633	<	* Finds or adds a node.
899	<	* @return null if added
633	>	* Virtualized support for map.get(); overridden in subclasses.
634		*/
635	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
636	<	(int h, Object k, Object v) {
637	<	Class<?> c = k.getClass();
638	<	TreeNode pp = root, p = null;
639	<	int dir = 0;
640	<	while (pp != null) { // find existing node or leaf to insert at
641	<	int ph;  Object pk; Class<?> pc;
642	<	p = pp;
643	<	if ((ph = p.hash) == h) {
910	<	if ((pk = p.key) == k || k.equals(pk))
911	<	return p;
912	<	if (c != (pc = pk.getClass()) ||
913	<	!(k instanceof Comparable) ||
914	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
915	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
916	<	TreeNode r = null, s = null, pl, pr;
917	<	if (dir >= 0) {
918	<	if ((pl = p.left) != null && h <= pl.hash)
919	<	s = pl;
920	<	}
921	<	else if ((pr = p.right) != null && h >= pr.hash)
922	<	s = pr;
923	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
924	<	return r;
925	<	}
926	<	}
927	<	else
928	<	dir = (h < ph) ? -1 : 1;
929	<	pp = (dir > 0) ? p.right : p.left;
930	<	}
931	<
932	<	TreeNode f = first;
933	<	TreeNode x = first = new TreeNode(h, k, v, f, p);
934	<	if (p == null)
935	<	root = x;
936	<	else { // attach and rebalance; adapted from CLR
937	<	TreeNode xp, xpp;
938	<	if (f != null)
939	<	f.prev = x;
940	<	if (dir <= 0)
941	<	p.left = x;
942	<	else
943	<	p.right = x;
944	<	x.red = true;
945	<	while (x != null && (xp = x.parent) != null && xp.red &&
946	<	(xpp = xp.parent) != null) {
947	<	TreeNode xppl = xpp.left;
948	<	if (xp == xppl) {
949	<	TreeNode y = xpp.right;
950	<	if (y != null && y.red) {
951	<	y.red = false;
952	<	xp.red = false;
953	<	xpp.red = true;
954	<	x = xpp;
955	<	}
956	<	else {
957	<	if (x == xp.right) {
958	<	rotateLeft(x = xp);
959	<	xpp = (xp = x.parent) == null ? null : xp.parent;
960	<	}
961	<	if (xp != null) {
962	<	xp.red = false;
963	<	if (xpp != null) {
964	<	xpp.red = true;
965	<	rotateRight(xpp);
966	<	}
967	<	}
968	<	}
969	<	}
970	<	else {
971	<	TreeNode y = xppl;
972	<	if (y != null && y.red) {
973	<	y.red = false;
974	<	xp.red = false;
975	<	xpp.red = true;
976	<	x = xpp;
977	<	}
978	<	else {
979	<	if (x == xp.left) {
980	<	rotateRight(x = xp);
981	<	xpp = (xp = x.parent) == null ? null : xp.parent;
982	<	}
983	<	if (xp != null) {
984	<	xp.red = false;
985	<	if (xpp != null) {
986	<	xpp.red = true;
987	<	rotateLeft(xpp);
988	<	}
989	<	}
990	<	}
991	<	}
992	<	}
993	<	TreeNode r = root;
994	<	if (r != null && r.red)
995	<	r.red = false;
635	>	Node<K,V> find(int h, Object k) {
636	>	Node<K,V> e = this;
637	>	if (k != null) {
638	>	do {
639	>	K ek;
640	>	if (e.hash == h &&
641	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
642	>	return e;
643	>	} while ((e = e.next) != null);
644		}
645		return null;
646		}
999	–
1000	–	/**
1001	–	* Removes the given node, that must be present before this
1002	–	* call.  This is messier than typical red-black deletion code
1003	–	* because we cannot swap the contents of an interior node
1004	–	* with a leaf successor that is pinned by "next" pointers
1005	–	* that are accessible independently of lock. So instead we
1006	–	* swap the tree linkages.
1007	–	*/
1008	–	final void deleteTreeNode(TreeNode p) {
1009	–	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
1010	–	TreeNode pred = p.prev;
1011	–	if (pred == null)
1012	–	first = next;
1013	–	else
1014	–	pred.next = next;
1015	–	if (next != null)
1016	–	next.prev = pred;
1017	–	TreeNode replacement;
1018	–	TreeNode pl = p.left;
1019	–	TreeNode pr = p.right;
1020	–	if (pl != null && pr != null) {
1021	–	TreeNode s = pr, sl;
1022	–	while ((sl = s.left) != null) // find successor
1023	–	s = sl;
1024	–	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
1025	–	TreeNode sr = s.right;
1026	–	TreeNode pp = p.parent;
1027	–	if (s == pr) { // p was s's direct parent
1028	–	p.parent = s;
1029	–	s.right = p;
1030	–	}
1031	–	else {
1032	–	TreeNode sp = s.parent;
1033	–	if ((p.parent = sp) != null) {
1034	–	if (s == sp.left)
1035	–	sp.left = p;
1036	–	else
1037	–	sp.right = p;
1038	–	}
1039	–	if ((s.right = pr) != null)
1040	–	pr.parent = s;
1041	–	}
1042	–	p.left = null;
1043	–	if ((p.right = sr) != null)
1044	–	sr.parent = p;
1045	–	if ((s.left = pl) != null)
1046	–	pl.parent = s;
1047	–	if ((s.parent = pp) == null)
1048	–	root = s;
1049	–	else if (p == pp.left)
1050	–	pp.left = s;
1051	–	else
1052	–	pp.right = s;
1053	–	replacement = sr;
1054	–	}
1055	–	else
1056	–	replacement = (pl != null) ? pl : pr;
1057	–	TreeNode pp = p.parent;
1058	–	if (replacement == null) {
1059	–	if (pp == null) {
1060	–	root = null;
1061	–	return;
1062	–	}
1063	–	replacement = p;
1064	–	}
1065	–	else {
1066	–	replacement.parent = pp;
1067	–	if (pp == null)
1068	–	root = replacement;
1069	–	else if (p == pp.left)
1070	–	pp.left = replacement;
1071	–	else
1072	–	pp.right = replacement;
1073	–	p.left = p.right = p.parent = null;
1074	–	}
1075	–	if (!p.red) { // rebalance, from CLR
1076	–	TreeNode x = replacement;
1077	–	while (x != null) {
1078	–	TreeNode xp, xpl;
1079	–	if (x.red || (xp = x.parent) == null) {
1080	–	x.red = false;
1081	–	break;
1082	–	}
1083	–	if (x == (xpl = xp.left)) {
1084	–	TreeNode sib = xp.right;
1085	–	if (sib != null && sib.red) {
1086	–	sib.red = false;
1087	–	xp.red = true;
1088	–	rotateLeft(xp);
1089	–	sib = (xp = x.parent) == null ? null : xp.right;
1090	–	}
1091	–	if (sib == null)
1092	–	x = xp;
1093	–	else {
1094	–	TreeNode sl = sib.left, sr = sib.right;
1095	–	if ((sr == null || !sr.red) &&
1096	–	(sl == null || !sl.red)) {
1097	–	sib.red = true;
1098	–	x = xp;
1099	–	}
1100	–	else {
1101	–	if (sr == null || !sr.red) {
1102	–	if (sl != null)
1103	–	sl.red = false;
1104	–	sib.red = true;
1105	–	rotateRight(sib);
1106	–	sib = (xp = x.parent) == null ? null : xp.right;
1107	–	}
1108	–	if (sib != null) {
1109	–	sib.red = (xp == null) ? false : xp.red;
1110	–	if ((sr = sib.right) != null)
1111	–	sr.red = false;
1112	–	}
1113	–	if (xp != null) {
1114	–	xp.red = false;
1115	–	rotateLeft(xp);
1116	–	}
1117	–	x = root;
1118	–	}
1119	–	}
1120	–	}
1121	–	else { // symmetric
1122	–	TreeNode sib = xpl;
1123	–	if (sib != null && sib.red) {
1124	–	sib.red = false;
1125	–	xp.red = true;
1126	–	rotateRight(xp);
1127	–	sib = (xp = x.parent) == null ? null : xp.left;
1128	–	}
1129	–	if (sib == null)
1130	–	x = xp;
1131	–	else {
1132	–	TreeNode sl = sib.left, sr = sib.right;
1133	–	if ((sl == null || !sl.red) &&
1134	–	(sr == null || !sr.red)) {
1135	–	sib.red = true;
1136	–	x = xp;
1137	–	}
1138	–	else {
1139	–	if (sl == null || !sl.red) {
1140	–	if (sr != null)
1141	–	sr.red = false;
1142	–	sib.red = true;
1143	–	rotateLeft(sib);
1144	–	sib = (xp = x.parent) == null ? null : xp.left;
1145	–	}
1146	–	if (sib != null) {
1147	–	sib.red = (xp == null) ? false : xp.red;
1148	–	if ((sl = sib.left) != null)
1149	–	sl.red = false;
1150	–	}
1151	–	if (xp != null) {
1152	–	xp.red = false;
1153	–	rotateRight(xp);
1154	–	}
1155	–	x = root;
1156	–	}
1157	–	}
1158	–	}
1159	–	}
1160	–	}
1161	–	if (p == replacement && (pp = p.parent) != null) {
1162	–	if (p == pp.left) // detach pointers
1163	–	pp.left = null;
1164	–	else if (p == pp.right)
1165	–	pp.right = null;
1166	–	p.parent = null;
1167	–	}
1168	–	}
647		}
648
649	<	/* ---------------- Collision reduction methods -------------- */
649	>	/* ---------------- Static utilities -------------- */
650
651		/**
652	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
653	<	* Because the table uses power-of-two masking, sets of hashes
654	<	* that vary only in bits above the current mask will always
655	<	* collide. (Among known examples are sets of Float keys holding
656	<	* consecutive whole numbers in small tables.)  To counter this,
657	<	* we apply a transform that spreads the impact of higher bits
652	>	* Spreads (XORs) higher bits of hash to lower and also forces top
653	>	* bit to 0. Because the table uses power-of-two masking, sets of
654	>	* hashes that vary only in bits above the current mask will
655	>	* always collide. (Among known examples are sets of Float keys
656	>	* holding consecutive whole numbers in small tables.)  So we
657	>	* apply a transform that spreads the impact of higher bits
658		* downward. There is a tradeoff between speed, utility, and
659		* quality of bit-spreading. Because many common sets of hashes
660	<	* are already reasonably distributed across bits (so don't benefit
661	<	* from spreading), and because we use trees to handle large sets
662	<	* of collisions in bins, we don't need excessively high quality.
660	>	* are already reasonably distributed (so don't benefit from
661	>	* spreading), and because we use trees to handle large sets of
662	>	* collisions in bins, we just XOR some shifted bits in the
663	>	* cheapest possible way to reduce systematic lossage, as well as
664	>	* to incorporate impact of the highest bits that would otherwise
665	>	* never be used in index calculations because of table bounds.
666		*/
667	<	private static final int spread(int h) {
668	<	h ^= (h >>> 18) ^ (h >>> 12);
1188	<	return (h ^ (h >>> 10)) & HASH_BITS;
667	>	static final int spread(int h) {
668	>	return (h ^ (h >>> 16)) & HASH_BITS;
669		}
670
671		/**
672	<	* Replaces a list bin with a tree bin. Call only when locked.
673	<	* Fails to replace if the given key is non-comparable or table
1194	<	* is, or needs, resizing.
672	>	* Returns a power of two table size for the given desired capacity.
673	>	* See Hackers Delight, sec 3.2
674		*/
675	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
676	<	if ((key instanceof Comparable) &&
677	<	(tab.length >= MAXIMUM_CAPACITY || counter.sum() < (long)sizeCtl)) {
1199	<	TreeBin t = new TreeBin();
1200	<	for (Node e = tabAt(tab, index); e != null; e = e.next)
1201	<	t.putTreeNode(e.hash & HASH_BITS, e.key, e.val);
1202	<	setTabAt(tab, index, new Node(MOVED, t, null, null));
1203	<	}
1204	<	}
1205	<
1206	<	/* ---------------- Internal access and update methods -------------- */
1207	<
1208	<	/** Implementation for get and containsKey */
1209	<	private final Object internalGet(Object k) {
1210	<	int h = spread(k.hashCode());
1211	<	retry: for (Node[] tab = table; tab != null;) {
1212	<	Node e, p; Object ek, ev; int eh;      // locals to read fields once
1213	<	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1214	<	if ((eh = e.hash) == MOVED) {
1215	<	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1216	<	return ((TreeBin)ek).getValue(h, k);
1217	<	else {                        // restart with new table
1218	<	tab = (Node[])ek;
1219	<	continue retry;
1220	<	}
1221	<	}
1222	<	else if ((eh & HASH_BITS) == h && (ev = e.val) != null &&
1223	<	((ek = e.key) == k || k.equals(ek)))
1224	<	return ev;
1225	<	}
1226	<	break;
1227	<	}
1228	<	return null;
675	>	private static final int tableSizeFor(int c) {
676	>	int n = -1 >>> Integer.numberOfLeadingZeros(c - 1);
677	>	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
678		}
679
680		/**
681	<	* Implementation for the four public remove/replace methods:
682	<	* Replaces node value with v, conditional upon match of cv if
1234	<	* non-null.  If resulting value is null, delete.
681	>	* Returns x's Class if it is of the form "class C implements
682	>	* Comparable<C>", else null.
683		*/
684	<	private final Object internalReplace(Object k, Object v, Object cv) {
685	<	int h = spread(k.hashCode());
686	<	Object oldVal = null;
687	<	for (Node[] tab = table;;) {
688	<	Node f; int i, fh; Object fk;
689	<	if (tab == null ||
690	<	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
691	<	break;
692	<	else if ((fh = f.hash) == MOVED) {
693	<	if ((fk = f.key) instanceof TreeBin) {
694	<	TreeBin t = (TreeBin)fk;
695	<	boolean validated = false;
696	<	boolean deleted = false;
1249	<	t.acquire(0);
1250	<	try {
1251	<	if (tabAt(tab, i) == f) {
1252	<	validated = true;
1253	<	TreeNode p = t.getTreeNode(h, k, t.root);
1254	<	if (p != null) {
1255	<	Object pv = p.val;
1256	<	if (cv == null || cv == pv || cv.equals(pv)) {
1257	<	oldVal = pv;
1258	<	if ((p.val = v) == null) {
1259	<	deleted = true;
1260	<	t.deleteTreeNode(p);
1261	<	}
1262	<	}
1263	<	}
1264	<	}
1265	<	} finally {
1266	<	t.release(0);
1267	<	}
1268	<	if (validated) {
1269	<	if (deleted)
1270	<	counter.add(-1L);
1271	<	break;
1272	<	}
1273	<	}
1274	<	else
1275	<	tab = (Node[])fk;
1276	<	}
1277	<	else if ((fh & HASH_BITS) != h && f.next == null) // precheck
1278	<	break;                          // rules out possible existence
1279	<	else if ((fh & LOCKED) != 0) {
1280	<	checkForResize();               // try resizing if can't get lock
1281	<	f.tryAwaitLock(tab, i);
1282	<	}
1283	<	else if (f.casHash(fh, fh | LOCKED)) {
1284	<	boolean validated = false;
1285	<	boolean deleted = false;
1286	<	try {
1287	<	if (tabAt(tab, i) == f) {
1288	<	validated = true;
1289	<	for (Node e = f, pred = null;;) {
1290	<	Object ek, ev;
1291	<	if ((e.hash & HASH_BITS) == h &&
1292	<	((ev = e.val) != null) &&
1293	<	((ek = e.key) == k || k.equals(ek))) {
1294	<	if (cv == null || cv == ev || cv.equals(ev)) {
1295	<	oldVal = ev;
1296	<	if ((e.val = v) == null) {
1297	<	deleted = true;
1298	<	Node en = e.next;
1299	<	if (pred != null)
1300	<	pred.next = en;
1301	<	else
1302	<	setTabAt(tab, i, en);
1303	<	}
1304	<	}
1305	<	break;
1306	<	}
1307	<	pred = e;
1308	<	if ((e = e.next) == null)
1309	<	break;
1310	<	}
1311	<	}
1312	<	} finally {
1313	<	if (!f.casHash(fh | LOCKED, fh)) {
1314	<	f.hash = fh;
1315	<	synchronized (f) { f.notifyAll(); };
1316	<	}
1317	<	}
1318	<	if (validated) {
1319	<	if (deleted)
1320	<	counter.add(-1L);
1321	<	break;
1322	<	}
1323	<	}
1324	<	}
1325	<	return oldVal;
1326	<	}
1327	<
1328	<	/*
1329	<	* Internal versions of the six insertion methods, each a
1330	<	* little more complicated than the last. All have
1331	<	* the same basic structure as the first (internalPut):
1332	<	*  1. If table uninitialized, create
1333	<	*  2. If bin empty, try to CAS new node
1334	<	*  3. If bin stale, use new table
1335	<	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1336	<	*  5. Lock and validate; if valid, scan and add or update
1337	<	*
1338	<	* The others interweave other checks and/or alternative actions:
1339	<	*  * Plain put checks for and performs resize after insertion.
1340	<	*  * putIfAbsent prescans for mapping without lock (and fails to add
1341	<	*    if present), which also makes pre-emptive resize checks worthwhile.
1342	<	*  * computeIfAbsent extends form used in putIfAbsent with additional
1343	<	*    mechanics to deal with, calls, potential exceptions and null
1344	<	*    returns from function call.
1345	<	*  * compute uses the same function-call mechanics, but without
1346	<	*    the prescans
1347	<	*  * merge acts as putIfAbsent in the absent case, but invokes the
1348	<	*    update function if present
1349	<	*  * putAll attempts to pre-allocate enough table space
1350	<	*    and more lazily performs count updates and checks.
1351	<	*
1352	<	* Someday when details settle down a bit more, it might be worth
1353	<	* some factoring to reduce sprawl.
1354	<	*/
1355	<
1356	<	/** Implementation for put */
1357	<	private final Object internalPut(Object k, Object v) {
1358	<	int h = spread(k.hashCode());
1359	<	int count = 0;
1360	<	for (Node[] tab = table;;) {
1361	<	int i; Node f; int fh; Object fk;
1362	<	if (tab == null)
1363	<	tab = initTable();
1364	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1365	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1366	<	break;                   // no lock when adding to empty bin
1367	<	}
1368	<	else if ((fh = f.hash) == MOVED) {
1369	<	if ((fk = f.key) instanceof TreeBin) {
1370	<	TreeBin t = (TreeBin)fk;
1371	<	Object oldVal = null;
1372	<	t.acquire(0);
1373	<	try {
1374	<	if (tabAt(tab, i) == f) {
1375	<	count = 2;
1376	<	TreeNode p = t.putTreeNode(h, k, v);
1377	<	if (p != null) {
1378	<	oldVal = p.val;
1379	<	p.val = v;
1380	<	}
1381	<	}
1382	<	} finally {
1383	<	t.release(0);
1384	<	}
1385	<	if (count != 0) {
1386	<	if (oldVal != null)
1387	<	return oldVal;
1388	<	break;
1389	<	}
1390	<	}
1391	<	else
1392	<	tab = (Node[])fk;
1393	<	}
1394	<	else if ((fh & LOCKED) != 0) {
1395	<	checkForResize();
1396	<	f.tryAwaitLock(tab, i);
1397	<	}
1398	<	else if (f.casHash(fh, fh | LOCKED)) {
1399	<	Object oldVal = null;
1400	<	try {                        // needed in case equals() throws
1401	<	if (tabAt(tab, i) == f) {
1402	<	count = 1;
1403	<	for (Node e = f;; ++count) {
1404	<	Object ek, ev;
1405	<	if ((e.hash & HASH_BITS) == h &&
1406	<	(ev = e.val) != null &&
1407	<	((ek = e.key) == k || k.equals(ek))) {
1408	<	oldVal = ev;
1409	<	e.val = v;
1410	<	break;
1411	<	}
1412	<	Node last = e;
1413	<	if ((e = e.next) == null) {
1414	<	last.next = new Node(h, k, v, null);
1415	<	if (count >= TREE_THRESHOLD)
1416	<	replaceWithTreeBin(tab, i, k);
1417	<	break;
1418	<	}
1419	<	}
1420	<	}
1421	<	} finally {                  // unlock and signal if needed
1422	<	if (!f.casHash(fh | LOCKED, fh)) {
1423	<	f.hash = fh;
1424	<	synchronized (f) { f.notifyAll(); };
1425	<	}
1426	<	}
1427	<	if (count != 0) {
1428	<	if (oldVal != null)
1429	<	return oldVal;
1430	<	if (tab.length <= 64)
1431	<	count = 2;
1432	<	break;
1433	<	}
1434	<	}
1435	<	}
1436	<	counter.add(1L);
1437	<	if (count > 1)
1438	<	checkForResize();
1439	<	return null;
1440	<	}
1441	<
1442	<	/** Implementation for putIfAbsent */
1443	<	private final Object internalPutIfAbsent(Object k, Object v) {
1444	<	int h = spread(k.hashCode());
1445	<	int count = 0;
1446	<	for (Node[] tab = table;;) {
1447	<	int i; Node f; int fh; Object fk, fv;
1448	<	if (tab == null)
1449	<	tab = initTable();
1450	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1451	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1452	<	break;
1453	<	}
1454	<	else if ((fh = f.hash) == MOVED) {
1455	<	if ((fk = f.key) instanceof TreeBin) {
1456	<	TreeBin t = (TreeBin)fk;
1457	<	Object oldVal = null;
1458	<	t.acquire(0);
1459	<	try {
1460	<	if (tabAt(tab, i) == f) {
1461	<	count = 2;
1462	<	TreeNode p = t.putTreeNode(h, k, v);
1463	<	if (p != null)
1464	<	oldVal = p.val;
1465	<	}
1466	<	} finally {
1467	<	t.release(0);
1468	<	}
1469	<	if (count != 0) {
1470	<	if (oldVal != null)
1471	<	return oldVal;
1472	<	break;
1473	<	}
1474	<	}
1475	<	else
1476	<	tab = (Node[])fk;
1477	<	}
1478	<	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1479	<	((fk = f.key) == k || k.equals(fk)))
1480	<	return fv;
1481	<	else {
1482	<	Node g = f.next;
1483	<	if (g != null) { // at least 2 nodes -- search and maybe resize
1484	<	for (Node e = g;;) {
1485	<	Object ek, ev;
1486	<	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1487	<	((ek = e.key) == k || k.equals(ek)))
1488	<	return ev;
1489	<	if ((e = e.next) == null) {
1490	<	checkForResize();
1491	<	break;
1492	<	}
1493	<	}
1494	<	}
1495	<	if (((fh = f.hash) & LOCKED) != 0) {
1496	<	checkForResize();
1497	<	f.tryAwaitLock(tab, i);
1498	<	}
1499	<	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1500	<	Object oldVal = null;
1501	<	try {
1502	<	if (tabAt(tab, i) == f) {
1503	<	count = 1;
1504	<	for (Node e = f;; ++count) {
1505	<	Object ek, ev;
1506	<	if ((e.hash & HASH_BITS) == h &&
1507	<	(ev = e.val) != null &&
1508	<	((ek = e.key) == k || k.equals(ek))) {
1509	<	oldVal = ev;
1510	<	break;
1511	<	}
1512	<	Node last = e;
1513	<	if ((e = e.next) == null) {
1514	<	last.next = new Node(h, k, v, null);
1515	<	if (count >= TREE_THRESHOLD)
1516	<	replaceWithTreeBin(tab, i, k);
1517	<	break;
1518	<	}
1519	<	}
1520	<	}
1521	<	} finally {
1522	<	if (!f.casHash(fh | LOCKED, fh)) {
1523	<	f.hash = fh;
1524	<	synchronized (f) { f.notifyAll(); };
1525	<	}
1526	<	}
1527	<	if (count != 0) {
1528	<	if (oldVal != null)
1529	<	return oldVal;
1530	<	if (tab.length <= 64)
1531	<	count = 2;
1532	<	break;
1533	<	}
684	>	static Class<?> comparableClassFor(Object x) {
685	>	if (x instanceof Comparable) {
686	>	Class<?> c; Type[] ts, as; ParameterizedType p;
687	>	if ((c = x.getClass()) == String.class) // bypass checks
688	>	return c;
689	>	if ((ts = c.getGenericInterfaces()) != null) {
690	>	for (Type t : ts) {
691	>	if ((t instanceof ParameterizedType) &&
692	>	((p = (ParameterizedType)t).getRawType() ==
693	>	Comparable.class) &&
694	>	(as = p.getActualTypeArguments()) != null &&
695	>	as.length == 1 && as[0] == c) // type arg is c
696	>	return c;
697		}
698		}
699		}
1537	–	counter.add(1L);
1538	–	if (count > 1)
1539	–	checkForResize();
700		return null;
701		}
702
703	<	/** Implementation for computeIfAbsent */
704	<	private final Object internalComputeIfAbsent(K k,
705	<	Fun<? super K, ?> mf) {
706	<	int h = spread(k.hashCode());
707	<	Object val = null;
708	<	int count = 0;
709	<	for (Node[] tab = table;;) {
710	<	Node f; int i, fh; Object fk, fv;
1551	<	if (tab == null)
1552	<	tab = initTable();
1553	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1554	<	Node node = new Node(fh = h | LOCKED, k, null, null);
1555	<	if (casTabAt(tab, i, null, node)) {
1556	<	count = 1;
1557	<	try {
1558	<	if ((val = mf.apply(k)) != null)
1559	<	node.val = val;
1560	<	} finally {
1561	<	if (val == null)
1562	<	setTabAt(tab, i, null);
1563	<	if (!node.casHash(fh, h)) {
1564	<	node.hash = h;
1565	<	synchronized (node) { node.notifyAll(); };
1566	<	}
1567	<	}
1568	<	}
1569	<	if (count != 0)
1570	<	break;
1571	<	}
1572	<	else if ((fh = f.hash) == MOVED) {
1573	<	if ((fk = f.key) instanceof TreeBin) {
1574	<	TreeBin t = (TreeBin)fk;
1575	<	boolean added = false;
1576	<	t.acquire(0);
1577	<	try {
1578	<	if (tabAt(tab, i) == f) {
1579	<	count = 1;
1580	<	TreeNode p = t.getTreeNode(h, k, t.root);
1581	<	if (p != null)
1582	<	val = p.val;
1583	<	else if ((val = mf.apply(k)) != null) {
1584	<	added = true;
1585	<	count = 2;
1586	<	t.putTreeNode(h, k, val);
1587	<	}
1588	<	}
1589	<	} finally {
1590	<	t.release(0);
1591	<	}
1592	<	if (count != 0) {
1593	<	if (!added)
1594	<	return val;
1595	<	break;
1596	<	}
1597	<	}
1598	<	else
1599	<	tab = (Node[])fk;
1600	<	}
1601	<	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1602	<	((fk = f.key) == k || k.equals(fk)))
1603	<	return fv;
1604	<	else {
1605	<	Node g = f.next;
1606	<	if (g != null) {
1607	<	for (Node e = g;;) {
1608	<	Object ek, ev;
1609	<	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1610	<	((ek = e.key) == k || k.equals(ek)))
1611	<	return ev;
1612	<	if ((e = e.next) == null) {
1613	<	checkForResize();
1614	<	break;
1615	<	}
1616	<	}
1617	<	}
1618	<	if (((fh = f.hash) & LOCKED) != 0) {
1619	<	checkForResize();
1620	<	f.tryAwaitLock(tab, i);
1621	<	}
1622	<	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1623	<	boolean added = false;
1624	<	try {
1625	<	if (tabAt(tab, i) == f) {
1626	<	count = 1;
1627	<	for (Node e = f;; ++count) {
1628	<	Object ek, ev;
1629	<	if ((e.hash & HASH_BITS) == h &&
1630	<	(ev = e.val) != null &&
1631	<	((ek = e.key) == k || k.equals(ek))) {
1632	<	val = ev;
1633	<	break;
1634	<	}
1635	<	Node last = e;
1636	<	if ((e = e.next) == null) {
1637	<	if ((val = mf.apply(k)) != null) {
1638	<	added = true;
1639	<	last.next = new Node(h, k, val, null);
1640	<	if (count >= TREE_THRESHOLD)
1641	<	replaceWithTreeBin(tab, i, k);
1642	<	}
1643	<	break;
1644	<	}
1645	<	}
1646	<	}
1647	<	} finally {
1648	<	if (!f.casHash(fh | LOCKED, fh)) {
1649	<	f.hash = fh;
1650	<	synchronized (f) { f.notifyAll(); };
1651	<	}
1652	<	}
1653	<	if (count != 0) {
1654	<	if (!added)
1655	<	return val;
1656	<	if (tab.length <= 64)
1657	<	count = 2;
1658	<	break;
1659	<	}
1660	<	}
1661	<	}
1662	<	}
1663	<	if (val != null) {
1664	<	counter.add(1L);
1665	<	if (count > 1)
1666	<	checkForResize();
1667	<	}
1668	<	return val;
703	>	/**
704	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
705	>	* class), else 0.
706	>	*/
707	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
708	>	static int compareComparables(Class<?> kc, Object k, Object x) {
709	>	return (x == null || x.getClass() != kc ? 0 :
710	>	((Comparable)k).compareTo(x));
711		}
712
713	<	/** Implementation for compute */
1672	<	@SuppressWarnings("unchecked") private final Object internalCompute
1673	<	(K k, boolean onlyIfPresent, BiFun<? super K, ? super V, ? extends V> mf) {
1674	<	int h = spread(k.hashCode());
1675	<	Object val = null;
1676	<	int delta = 0;
1677	<	int count = 0;
1678	<	for (Node[] tab = table;;) {
1679	<	Node f; int i, fh; Object fk;
1680	<	if (tab == null)
1681	<	tab = initTable();
1682	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1683	<	if (onlyIfPresent)
1684	<	break;
1685	<	Node node = new Node(fh = h | LOCKED, k, null, null);
1686	<	if (casTabAt(tab, i, null, node)) {
1687	<	try {
1688	<	count = 1;
1689	<	if ((val = mf.apply(k, null)) != null) {
1690	<	node.val = val;
1691	<	delta = 1;
1692	<	}
1693	<	} finally {
1694	<	if (delta == 0)
1695	<	setTabAt(tab, i, null);
1696	<	if (!node.casHash(fh, h)) {
1697	<	node.hash = h;
1698	<	synchronized (node) { node.notifyAll(); };
1699	<	}
1700	<	}
1701	<	}
1702	<	if (count != 0)
1703	<	break;
1704	<	}
1705	<	else if ((fh = f.hash) == MOVED) {
1706	<	if ((fk = f.key) instanceof TreeBin) {
1707	<	TreeBin t = (TreeBin)fk;
1708	<	t.acquire(0);
1709	<	try {
1710	<	if (tabAt(tab, i) == f) {
1711	<	count = 1;
1712	<	TreeNode p = t.getTreeNode(h, k, t.root);
1713	<	Object pv = (p == null) ? null : p.val;
1714	<	if ((val = mf.apply(k, (V)pv)) != null) {
1715	<	if (p != null)
1716	<	p.val = val;
1717	<	else {
1718	<	count = 2;
1719	<	delta = 1;
1720	<	t.putTreeNode(h, k, val);
1721	<	}
1722	<	}
1723	<	else if (p != null) {
1724	<	delta = -1;
1725	<	t.deleteTreeNode(p);
1726	<	}
1727	<	}
1728	<	} finally {
1729	<	t.release(0);
1730	<	}
1731	<	if (count != 0)
1732	<	break;
1733	<	}
1734	<	else
1735	<	tab = (Node[])fk;
1736	<	}
1737	<	else if ((fh & LOCKED) != 0) {
1738	<	checkForResize();
1739	<	f.tryAwaitLock(tab, i);
1740	<	}
1741	<	else if (f.casHash(fh, fh | LOCKED)) {
1742	<	try {
1743	<	if (tabAt(tab, i) == f) {
1744	<	count = 1;
1745	<	for (Node e = f, pred = null;; ++count) {
1746	<	Object ek, ev;
1747	<	if ((e.hash & HASH_BITS) == h &&
1748	<	(ev = e.val) != null &&
1749	<	((ek = e.key) == k || k.equals(ek))) {
1750	<	val = mf.apply(k, (V)ev);
1751	<	if (val != null)
1752	<	e.val = val;
1753	<	else {
1754	<	delta = -1;
1755	<	Node en = e.next;
1756	<	if (pred != null)
1757	<	pred.next = en;
1758	<	else
1759	<	setTabAt(tab, i, en);
1760	<	}
1761	<	break;
1762	<	}
1763	<	pred = e;
1764	<	if ((e = e.next) == null) {
1765	<	if (!onlyIfPresent && (val = mf.apply(k, null)) != null) {
1766	<	pred.next = new Node(h, k, val, null);
1767	<	delta = 1;
1768	<	if (count >= TREE_THRESHOLD)
1769	<	replaceWithTreeBin(tab, i, k);
1770	<	}
1771	<	break;
1772	<	}
1773	<	}
1774	<	}
1775	<	} finally {
1776	<	if (!f.casHash(fh | LOCKED, fh)) {
1777	<	f.hash = fh;
1778	<	synchronized (f) { f.notifyAll(); };
1779	<	}
1780	<	}
1781	<	if (count != 0) {
1782	<	if (tab.length <= 64)
1783	<	count = 2;
1784	<	break;
1785	<	}
1786	<	}
1787	<	}
1788	<	if (delta != 0) {
1789	<	counter.add((long)delta);
1790	<	if (count > 1)
1791	<	checkForResize();
1792	<	}
1793	<	return val;
1794	<	}
713	>	/* ---------------- Table element access -------------- */
714
715	<	/** Implementation for merge */
716	<	@SuppressWarnings("unchecked") private final Object internalMerge
717	<	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
718	<	int h = spread(k.hashCode());
719	<	Object val = null;
720	<	int delta = 0;
721	<	int count = 0;
722	<	for (Node[] tab = table;;) {
723	<	int i; Node f; int fh; Object fk, fv;
724	<	if (tab == null)
725	<	tab = initTable();
726	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
727	<	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
728	<	delta = 1;
729	<	val = v;
730	<	break;
731	<	}
732	<	}
733	<	else if ((fh = f.hash) == MOVED) {
734	<	if ((fk = f.key) instanceof TreeBin) {
735	<	TreeBin t = (TreeBin)fk;
736	<	t.acquire(0);
1818	<	try {
1819	<	if (tabAt(tab, i) == f) {
1820	<	count = 1;
1821	<	TreeNode p = t.getTreeNode(h, k, t.root);
1822	<	val = (p == null) ? v : mf.apply((V)p.val, v);
1823	<	if (val != null) {
1824	<	if (p != null)
1825	<	p.val = val;
1826	<	else {
1827	<	count = 2;
1828	<	delta = 1;
1829	<	t.putTreeNode(h, k, val);
1830	<	}
1831	<	}
1832	<	else if (p != null) {
1833	<	delta = -1;
1834	<	t.deleteTreeNode(p);
1835	<	}
1836	<	}
1837	<	} finally {
1838	<	t.release(0);
1839	<	}
1840	<	if (count != 0)
1841	<	break;
1842	<	}
1843	<	else
1844	<	tab = (Node[])fk;
1845	<	}
1846	<	else if ((fh & LOCKED) != 0) {
1847	<	checkForResize();
1848	<	f.tryAwaitLock(tab, i);
1849	<	}
1850	<	else if (f.casHash(fh, fh | LOCKED)) {
1851	<	try {
1852	<	if (tabAt(tab, i) == f) {
1853	<	count = 1;
1854	<	for (Node e = f, pred = null;; ++count) {
1855	<	Object ek, ev;
1856	<	if ((e.hash & HASH_BITS) == h &&
1857	<	(ev = e.val) != null &&
1858	<	((ek = e.key) == k || k.equals(ek))) {
1859	<	val = mf.apply(v, (V)ev);
1860	<	if (val != null)
1861	<	e.val = val;
1862	<	else {
1863	<	delta = -1;
1864	<	Node en = e.next;
1865	<	if (pred != null)
1866	<	pred.next = en;
1867	<	else
1868	<	setTabAt(tab, i, en);
1869	<	}
1870	<	break;
1871	<	}
1872	<	pred = e;
1873	<	if ((e = e.next) == null) {
1874	<	val = v;
1875	<	pred.next = new Node(h, k, val, null);
1876	<	delta = 1;
1877	<	if (count >= TREE_THRESHOLD)
1878	<	replaceWithTreeBin(tab, i, k);
1879	<	break;
1880	<	}
1881	<	}
1882	<	}
1883	<	} finally {
1884	<	if (!f.casHash(fh | LOCKED, fh)) {
1885	<	f.hash = fh;
1886	<	synchronized (f) { f.notifyAll(); };
1887	<	}
1888	<	}
1889	<	if (count != 0) {
1890	<	if (tab.length <= 64)
1891	<	count = 2;
1892	<	break;
1893	<	}
1894	<	}
1895	<	}
1896	<	if (delta != 0) {
1897	<	counter.add((long)delta);
1898	<	if (count > 1)
1899	<	checkForResize();
1900	<	}
1901	<	return val;
715	>	/*
716	>	* Atomic access methods are used for table elements as well as
717	>	* elements of in-progress next table while resizing.  All uses of
718	>	* the tab arguments must be null checked by callers.  All callers
719	>	* also paranoically precheck that tab's length is not zero (or an
720	>	* equivalent check), thus ensuring that any index argument taking
721	>	* the form of a hash value anded with (length - 1) is a valid
722	>	* index.  Note that, to be correct wrt arbitrary concurrency
723	>	* errors by users, these checks must operate on local variables,
724	>	* which accounts for some odd-looking inline assignments below.
725	>	* Note that calls to setTabAt always occur within locked regions,
726	>	* and so require only release ordering.
727	>	*/
728	>
729	>	@SuppressWarnings("unchecked")
730	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
731	>	return (Node<K,V>)U.getObjectAcquire(tab, ((long)i << ASHIFT) + ABASE);
732	>	}
733	>
734	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
735	>	Node<K,V> c, Node<K,V> v) {
736	>	return U.compareAndSetObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
737		}
738
739	<	/** Implementation for putAll */
740	<	private final void internalPutAll(Map<?, ?> m) {
1906	<	tryPresize(m.size());
1907	<	long delta = 0L;     // number of uncommitted additions
1908	<	boolean npe = false; // to throw exception on exit for nulls
1909	<	try {                // to clean up counts on other exceptions
1910	<	for (Map.Entry<?, ?> entry : m.entrySet()) {
1911	<	Object k, v;
1912	<	if (entry == null || (k = entry.getKey()) == null ||
1913	<	(v = entry.getValue()) == null) {
1914	<	npe = true;
1915	<	break;
1916	<	}
1917	<	int h = spread(k.hashCode());
1918	<	for (Node[] tab = table;;) {
1919	<	int i; Node f; int fh; Object fk;
1920	<	if (tab == null)
1921	<	tab = initTable();
1922	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
1923	<	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1924	<	++delta;
1925	<	break;
1926	<	}
1927	<	}
1928	<	else if ((fh = f.hash) == MOVED) {
1929	<	if ((fk = f.key) instanceof TreeBin) {
1930	<	TreeBin t = (TreeBin)fk;
1931	<	boolean validated = false;
1932	<	t.acquire(0);
1933	<	try {
1934	<	if (tabAt(tab, i) == f) {
1935	<	validated = true;
1936	<	TreeNode p = t.getTreeNode(h, k, t.root);
1937	<	if (p != null)
1938	<	p.val = v;
1939	<	else {
1940	<	t.putTreeNode(h, k, v);
1941	<	++delta;
1942	<	}
1943	<	}
1944	<	} finally {
1945	<	t.release(0);
1946	<	}
1947	<	if (validated)
1948	<	break;
1949	<	}
1950	<	else
1951	<	tab = (Node[])fk;
1952	<	}
1953	<	else if ((fh & LOCKED) != 0) {
1954	<	counter.add(delta);
1955	<	delta = 0L;
1956	<	checkForResize();
1957	<	f.tryAwaitLock(tab, i);
1958	<	}
1959	<	else if (f.casHash(fh, fh | LOCKED)) {
1960	<	int count = 0;
1961	<	try {
1962	<	if (tabAt(tab, i) == f) {
1963	<	count = 1;
1964	<	for (Node e = f;; ++count) {
1965	<	Object ek, ev;
1966	<	if ((e.hash & HASH_BITS) == h &&
1967	<	(ev = e.val) != null &&
1968	<	((ek = e.key) == k || k.equals(ek))) {
1969	<	e.val = v;
1970	<	break;
1971	<	}
1972	<	Node last = e;
1973	<	if ((e = e.next) == null) {
1974	<	++delta;
1975	<	last.next = new Node(h, k, v, null);
1976	<	if (count >= TREE_THRESHOLD)
1977	<	replaceWithTreeBin(tab, i, k);
1978	<	break;
1979	<	}
1980	<	}
1981	<	}
1982	<	} finally {
1983	<	if (!f.casHash(fh | LOCKED, fh)) {
1984	<	f.hash = fh;
1985	<	synchronized (f) { f.notifyAll(); };
1986	<	}
1987	<	}
1988	<	if (count != 0) {
1989	<	if (count > 1) {
1990	<	counter.add(delta);
1991	<	delta = 0L;
1992	<	checkForResize();
1993	<	}
1994	<	break;
1995	<	}
1996	<	}
1997	<	}
1998	<	}
1999	<	} finally {
2000	<	if (delta != 0)
2001	<	counter.add(delta);
2002	<	}
2003	<	if (npe)
2004	<	throw new NullPointerException();
739	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
740	>	U.putObjectRelease(tab, ((long)i << ASHIFT) + ABASE, v);
741		}
742
743	<	/* ---------------- Table Initialization and Resizing -------------- */
743	>	/* ---------------- Fields -------------- */
744
745		/**
746	<	* Returns a power of two table size for the given desired capacity.
747	<	* See Hackers Delight, sec 3.2
746	>	* The array of bins. Lazily initialized upon first insertion.
747	>	* Size is always a power of two. Accessed directly by iterators.
748		*/
749	<	private static final int tableSizeFor(int c) {
2014	<	int n = c - 1;
2015	<	n |= n >>> 1;
2016	<	n |= n >>> 2;
2017	<	n |= n >>> 4;
2018	<	n |= n >>> 8;
2019	<	n |= n >>> 16;
2020	<	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
2021	<	}
749	>	transient volatile Node<K,V>[] table;
750
751		/**
752	<	* Initializes table, using the size recorded in sizeCtl.
752	>	* The next table to use; non-null only while resizing.
753		*/
754	<	private final Node[] initTable() {
2027	<	Node[] tab; int sc;
2028	<	while ((tab = table) == null) {
2029	<	if ((sc = sizeCtl) < 0)
2030	<	Thread.yield(); // lost initialization race; just spin
2031	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2032	<	try {
2033	<	if ((tab = table) == null) {
2034	<	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2035	<	tab = table = new Node[n];
2036	<	sc = n - (n >>> 2);
2037	<	}
2038	<	} finally {
2039	<	sizeCtl = sc;
2040	<	}
2041	<	break;
2042	<	}
2043	<	}
2044	<	return tab;
2045	<	}
2046	<
2047	<	/**
2048	<	* If table is too small and not already resizing, creates next
2049	<	* table and transfers bins.  Rechecks occupancy after a transfer
2050	<	* to see if another resize is already needed because resizings
2051	<	* are lagging additions.
2052	<	*/
2053	<	private final void checkForResize() {
2054	<	Node[] tab; int n, sc;
2055	<	while ((tab = table) != null &&
2056	<	(n = tab.length) < MAXIMUM_CAPACITY &&
2057	<	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
2058	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2059	<	try {
2060	<	if (tab == table) {
2061	<	table = rebuild(tab);
2062	<	sc = (n << 1) - (n >>> 1);
2063	<	}
2064	<	} finally {
2065	<	sizeCtl = sc;
2066	<	}
2067	<	}
2068	<	}
754	>	private transient volatile Node<K,V>[] nextTable;
755
756		/**
757	<	* Tries to presize table to accommodate the given number of elements.
758	<	*
759	<	* @param size number of elements (doesn't need to be perfectly accurate)
757	>	* Base counter value, used mainly when there is no contention,
758	>	* but also as a fallback during table initialization
759	>	* races. Updated via CAS.
760		*/
761	<	private final void tryPresize(int size) {
2076	<	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2077	<	tableSizeFor(size + (size >>> 1) + 1);
2078	<	int sc;
2079	<	while ((sc = sizeCtl) >= 0) {
2080	<	Node[] tab = table; int n;
2081	<	if (tab == null || (n = tab.length) == 0) {
2082	<	n = (sc > c) ? sc : c;
2083	<	if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2084	<	try {
2085	<	if (table == tab) {
2086	<	table = new Node[n];
2087	<	sc = n - (n >>> 2);
2088	<	}
2089	<	} finally {
2090	<	sizeCtl = sc;
2091	<	}
2092	<	}
2093	<	}
2094	<	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2095	<	break;
2096	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2097	<	try {
2098	<	if (table == tab) {
2099	<	table = rebuild(tab);
2100	<	sc = (n << 1) - (n >>> 1);
2101	<	}
2102	<	} finally {
2103	<	sizeCtl = sc;
2104	<	}
2105	<	}
2106	<	}
2107	<	}
2108	<
2109	<	/*
2110	<	* Moves and/or copies the nodes in each bin to new table. See
2111	<	* above for explanation.
2112	<	*
2113	<	* @return the new table
2114	<	*/
2115	<	private static final Node[] rebuild(Node[] tab) {
2116	<	int n = tab.length;
2117	<	Node[] nextTab = new Node[n << 1];
2118	<	Node fwd = new Node(MOVED, nextTab, null, null);
2119	<	int[] buffer = null;       // holds bins to revisit; null until needed
2120	<	Node rev = null;           // reverse forwarder; null until needed
2121	<	int nbuffered = 0;         // the number of bins in buffer list
2122	<	int bufferIndex = 0;       // buffer index of current buffered bin
2123	<	int bin = n - 1;           // current non-buffered bin or -1 if none
2124	<
2125	<	for (int i = bin;;) {      // start upwards sweep
2126	<	int fh; Node f;
2127	<	if ((f = tabAt(tab, i)) == null) {
2128	<	if (bin >= 0) {    // Unbuffered; no lock needed (or available)
2129	<	if (!casTabAt(tab, i, f, fwd))
2130	<	continue;
2131	<	}
2132	<	else {             // transiently use a locked forwarding node
2133	<	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
2134	<	if (!casTabAt(tab, i, f, g))
2135	<	continue;
2136	<	setTabAt(nextTab, i, null);
2137	<	setTabAt(nextTab, i + n, null);
2138	<	setTabAt(tab, i, fwd);
2139	<	if (!g.casHash(MOVED|LOCKED, MOVED)) {
2140	<	g.hash = MOVED;
2141	<	synchronized (g) { g.notifyAll(); }
2142	<	}
2143	<	}
2144	<	}
2145	<	else if ((fh = f.hash) == MOVED) {
2146	<	Object fk = f.key;
2147	<	if (fk instanceof TreeBin) {
2148	<	TreeBin t = (TreeBin)fk;
2149	<	boolean validated = false;
2150	<	t.acquire(0);
2151	<	try {
2152	<	if (tabAt(tab, i) == f) {
2153	<	validated = true;
2154	<	splitTreeBin(nextTab, i, t);
2155	<	setTabAt(tab, i, fwd);
2156	<	}
2157	<	} finally {
2158	<	t.release(0);
2159	<	}
2160	<	if (!validated)
2161	<	continue;
2162	<	}
2163	<	}
2164	<	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
2165	<	boolean validated = false;
2166	<	try {              // split to lo and hi lists; copying as needed
2167	<	if (tabAt(tab, i) == f) {
2168	<	validated = true;
2169	<	splitBin(nextTab, i, f);
2170	<	setTabAt(tab, i, fwd);
2171	<	}
2172	<	} finally {
2173	<	if (!f.casHash(fh | LOCKED, fh)) {
2174	<	f.hash = fh;
2175	<	synchronized (f) { f.notifyAll(); };
2176	<	}
2177	<	}
2178	<	if (!validated)
2179	<	continue;
2180	<	}
2181	<	else {
2182	<	if (buffer == null) // initialize buffer for revisits
2183	<	buffer = new int[TRANSFER_BUFFER_SIZE];
2184	<	if (bin < 0 && bufferIndex > 0) {
2185	<	int j = buffer[--bufferIndex];
2186	<	buffer[bufferIndex] = i;
2187	<	i = j;         // swap with another bin
2188	<	continue;
2189	<	}
2190	<	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
2191	<	f.tryAwaitLock(tab, i);
2192	<	continue;      // no other options -- block
2193	<	}
2194	<	if (rev == null)   // initialize reverse-forwarder
2195	<	rev = new Node(MOVED, tab, null, null);
2196	<	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
2197	<	continue;      // recheck before adding to list
2198	<	buffer[nbuffered++] = i;
2199	<	setTabAt(nextTab, i, rev);     // install place-holders
2200	<	setTabAt(nextTab, i + n, rev);
2201	<	}
2202	<
2203	<	if (bin > 0)
2204	<	i = --bin;
2205	<	else if (buffer != null && nbuffered > 0) {
2206	<	bin = -1;
2207	<	i = buffer[bufferIndex = --nbuffered];
2208	<	}
2209	<	else
2210	<	return nextTab;
2211	<	}
2212	<	}
761	>	private transient volatile long baseCount;
762
763		/**
764	<	* Splits a normal bin with list headed by e into lo and hi parts;
765	<	* installs in given table.
764	>	* Table initialization and resizing control.  When negative, the
765	>	* table is being initialized or resized: -1 for initialization,
766	>	* else -(1 + the number of active resizing threads).  Otherwise,
767	>	* when table is null, holds the initial table size to use upon
768	>	* creation, or 0 for default. After initialization, holds the
769	>	* next element count value upon which to resize the table.
770		*/
771	<	private static void splitBin(Node[] nextTab, int i, Node e) {
2219	<	int bit = nextTab.length >>> 1; // bit to split on
2220	<	int runBit = e.hash & bit;
2221	<	Node lastRun = e, lo = null, hi = null;
2222	<	for (Node p = e.next; p != null; p = p.next) {
2223	<	int b = p.hash & bit;
2224	<	if (b != runBit) {
2225	<	runBit = b;
2226	<	lastRun = p;
2227	<	}
2228	<	}
2229	<	if (runBit == 0)
2230	<	lo = lastRun;
2231	<	else
2232	<	hi = lastRun;
2233	<	for (Node p = e; p != lastRun; p = p.next) {
2234	<	int ph = p.hash & HASH_BITS;
2235	<	Object pk = p.key, pv = p.val;
2236	<	if ((ph & bit) == 0)
2237	<	lo = new Node(ph, pk, pv, lo);
2238	<	else
2239	<	hi = new Node(ph, pk, pv, hi);
2240	<	}
2241	<	setTabAt(nextTab, i, lo);
2242	<	setTabAt(nextTab, i + bit, hi);
2243	<	}
771	>	private transient volatile int sizeCtl;
772
773		/**
774	<	* Splits a tree bin into lo and hi parts; installs in given table.
774	>	* The next table index (plus one) to split while resizing.
775		*/
776	<	private static void splitTreeBin(Node[] nextTab, int i, TreeBin t) {
2249	<	int bit = nextTab.length >>> 1;
2250	<	TreeBin lt = new TreeBin();
2251	<	TreeBin ht = new TreeBin();
2252	<	int lc = 0, hc = 0;
2253	<	for (Node e = t.first; e != null; e = e.next) {
2254	<	int h = e.hash & HASH_BITS;
2255	<	Object k = e.key, v = e.val;
2256	<	if ((h & bit) == 0) {
2257	<	++lc;
2258	<	lt.putTreeNode(h, k, v);
2259	<	}
2260	<	else {
2261	<	++hc;
2262	<	ht.putTreeNode(h, k, v);
2263	<	}
2264	<	}
2265	<	Node ln, hn; // throw away trees if too small
2266	<	if (lc <= (TREE_THRESHOLD >>> 1)) {
2267	<	ln = null;
2268	<	for (Node p = lt.first; p != null; p = p.next)
2269	<	ln = new Node(p.hash, p.key, p.val, ln);
2270	<	}
2271	<	else
2272	<	ln = new Node(MOVED, lt, null, null);
2273	<	setTabAt(nextTab, i, ln);
2274	<	if (hc <= (TREE_THRESHOLD >>> 1)) {
2275	<	hn = null;
2276	<	for (Node p = ht.first; p != null; p = p.next)
2277	<	hn = new Node(p.hash, p.key, p.val, hn);
2278	<	}
2279	<	else
2280	<	hn = new Node(MOVED, ht, null, null);
2281	<	setTabAt(nextTab, i + bit, hn);
2282	<	}
776	>	private transient volatile int transferIndex;
777
778		/**
779	<	* Implementation for clear. Steps through each bin, removing all
2286	<	* nodes.
779	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
780		*/
781	<	private final void internalClear() {
2289	<	long delta = 0L; // negative number of deletions
2290	<	int i = 0;
2291	<	Node[] tab = table;
2292	<	while (tab != null && i < tab.length) {
2293	<	int fh; Object fk;
2294	<	Node f = tabAt(tab, i);
2295	<	if (f == null)
2296	<	++i;
2297	<	else if ((fh = f.hash) == MOVED) {
2298	<	if ((fk = f.key) instanceof TreeBin) {
2299	<	TreeBin t = (TreeBin)fk;
2300	<	t.acquire(0);
2301	<	try {
2302	<	if (tabAt(tab, i) == f) {
2303	<	for (Node p = t.first; p != null; p = p.next) {
2304	<	if (p.val != null) { // (currently always true)
2305	<	p.val = null;
2306	<	--delta;
2307	<	}
2308	<	}
2309	<	t.first = null;
2310	<	t.root = null;
2311	<	++i;
2312	<	}
2313	<	} finally {
2314	<	t.release(0);
2315	<	}
2316	<	}
2317	<	else
2318	<	tab = (Node[])fk;
2319	<	}
2320	<	else if ((fh & LOCKED) != 0) {
2321	<	counter.add(delta); // opportunistically update count
2322	<	delta = 0L;
2323	<	f.tryAwaitLock(tab, i);
2324	<	}
2325	<	else if (f.casHash(fh, fh | LOCKED)) {
2326	<	try {
2327	<	if (tabAt(tab, i) == f) {
2328	<	for (Node e = f; e != null; e = e.next) {
2329	<	if (e.val != null) {  // (currently always true)
2330	<	e.val = null;
2331	<	--delta;
2332	<	}
2333	<	}
2334	<	setTabAt(tab, i, null);
2335	<	++i;
2336	<	}
2337	<	} finally {
2338	<	if (!f.casHash(fh | LOCKED, fh)) {
2339	<	f.hash = fh;
2340	<	synchronized (f) { f.notifyAll(); };
2341	<	}
2342	<	}
2343	<	}
2344	<	}
2345	<	if (delta != 0)
2346	<	counter.add(delta);
2347	<	}
2348	<
2349	<	/* ----------------Table Traversal -------------- */
781	>	private transient volatile int cellsBusy;
782
783		/**
784	<	* Encapsulates traversal for methods such as containsValue; also
785	<	* serves as a base class for other iterators and bulk tasks.
786	<	*
2355	<	* At each step, the iterator snapshots the key ("nextKey") and
2356	<	* value ("nextVal") of a valid node (i.e., one that, at point of
2357	<	* snapshot, has a non-null user value). Because val fields can
2358	<	* change (including to null, indicating deletion), field nextVal
2359	<	* might not be accurate at point of use, but still maintains the
2360	<	* weak consistency property of holding a value that was once
2361	<	* valid. To support iterator.remove, the nextKey field is not
2362	<	* updated (nulled out) when the iterator cannot advance.
2363	<	*
2364	<	* Internal traversals directly access these fields, as in:
2365	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2366	<	*
2367	<	* Exported iterators must track whether the iterator has advanced
2368	<	* (in hasNext vs next) (by setting/checking/nulling field
2369	<	* nextVal), and then extract key, value, or key-value pairs as
2370	<	* return values of next().
2371	<	*
2372	<	* The iterator visits once each still-valid node that was
2373	<	* reachable upon iterator construction. It might miss some that
2374	<	* were added to a bin after the bin was visited, which is OK wrt
2375	<	* consistency guarantees. Maintaining this property in the face
2376	<	* of possible ongoing resizes requires a fair amount of
2377	<	* bookkeeping state that is difficult to optimize away amidst
2378	<	* volatile accesses.  Even so, traversal maintains reasonable
2379	<	* throughput.
2380	<	*
2381	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2382	<	* However, if the table has been resized, then all future steps
2383	<	* must traverse both the bin at the current index as well as at
2384	<	* (index + baseSize); and so on for further resizings. To
2385	<	* paranoically cope with potential sharing by users of iterators
2386	<	* across threads, iteration terminates if a bounds checks fails
2387	<	* for a table read.
2388	<	*
2389	<	* This class extends ForkJoinTask to streamline parallel
2390	<	* iteration in bulk operations (see BulkTask). This adds only an
2391	<	* int of space overhead, which is close enough to negligible in
2392	<	* cases where it is not needed to not worry about it.  Because
2393	<	* ForkJoinTask is Serializable, but iterators need not be, we
2394	<	* need to add warning suppressions.
2395	<	*/
2396	<	@SuppressWarnings("serial") static class Traverser<K,V,R> extends ForkJoinTask<R> {
2397	<	final ConcurrentHashMap<K, V> map;
2398	<	Node next;           // the next entry to use
2399	<	Object nextKey;      // cached key field of next
2400	<	Object nextVal;      // cached val field of next
2401	<	Node[] tab;          // current table; updated if resized
2402	<	int index;           // index of bin to use next
2403	<	int baseIndex;       // current index of initial table
2404	<	int baseLimit;       // index bound for initial table
2405	<	int baseSize;        // initial table size
2406	<
2407	<	/** Creates iterator for all entries in the table. */
2408	<	Traverser(ConcurrentHashMap<K, V> map) {
2409	<	this.map = map;
2410	<	}
2411	<
2412	<	/** Creates iterator for split() methods */
2413	<	Traverser(Traverser<K,V,?> it) {
2414	<	ConcurrentHashMap<K, V> m; Node[] t;
2415	<	if ((m = this.map = it.map) == null)
2416	<	t = null;
2417	<	else if ((t = it.tab) == null && // force parent tab initialization
2418	<	(t = it.tab = m.table) != null)
2419	<	it.baseLimit = it.baseSize = t.length;
2420	<	this.tab = t;
2421	<	this.baseSize = it.baseSize;
2422	<	it.baseLimit = this.index = this.baseIndex =
2423	<	((this.baseLimit = it.baseLimit) + it.baseIndex + 1) >>> 1;
2424	<	}
2425	<
2426	<	/**
2427	<	* Advances next; returns nextVal or null if terminated.
2428	<	* See above for explanation.
2429	<	*/
2430	<	final Object advance() {
2431	<	Node e = next;
2432	<	Object ev = null;
2433	<	outer: do {
2434	<	if (e != null)                  // advance past used/skipped node
2435	<	e = e.next;
2436	<	while (e == null) {             // get to next non-null bin
2437	<	ConcurrentHashMap<K, V> m;
2438	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2439	<	if ((t = tab) != null)
2440	<	n = t.length;
2441	<	else if ((m = map) != null && (t = tab = m.table) != null)
2442	<	n = baseLimit = baseSize = t.length;
2443	<	else
2444	<	break outer;
2445	<	if ((b = baseIndex) >= baseLimit ||
2446	<	(i = index) < 0 || i >= n)
2447	<	break outer;
2448	<	if ((e = tabAt(t, i)) != null && e.hash == MOVED) {
2449	<	if ((ek = e.key) instanceof TreeBin)
2450	<	e = ((TreeBin)ek).first;
2451	<	else {
2452	<	tab = (Node[])ek;
2453	<	continue;           // restarts due to null val
2454	<	}
2455	<	}                           // visit upper slots if present
2456	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2457	<	}
2458	<	nextKey = e.key;
2459	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2460	<	next = e;
2461	<	return nextVal = ev;
2462	<	}
2463	<
2464	<	public final void remove() {
2465	<	Object k = nextKey;
2466	<	if (k == null && (advance() == null || (k = nextKey) == null))
2467	<	throw new IllegalStateException();
2468	<	map.internalReplace(k, null, null);
2469	<	}
784	>	* Table of counter cells. When non-null, size is a power of 2.
785	>	*/
786	>	private transient volatile CounterCell[] counterCells;
787
788	<	public final boolean hasNext() {
789	<	return nextVal != null || advance() != null;
790	<	}
788	>	// views
789	>	private transient KeySetView<K,V> keySet;
790	>	private transient ValuesView<K,V> values;
791	>	private transient EntrySetView<K,V> entrySet;
792
2475	–	public final boolean hasMoreElements() { return hasNext(); }
2476	–	public final void setRawResult(Object x) { }
2477	–	public R getRawResult() { return null; }
2478	–	public boolean exec() { return true; }
2479	–	}
793
794		/* ---------------- Public operations -------------- */
795
#	Line 2484 | Line 797 | public class ConcurrentHashMap<K, V>
797		* Creates a new, empty map with the default initial table size (16).
798		*/
799		public ConcurrentHashMap() {
2487	–	this.counter = new LongAdder();
800		}
801
802		/**
#	Line 2498 | Line 810 | public class ConcurrentHashMap<K, V>
810		* elements is negative
811		*/
812		public ConcurrentHashMap(int initialCapacity) {
813	<	if (initialCapacity < 0)
2502	<	throw new IllegalArgumentException();
2503	<	int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
2504	<	MAXIMUM_CAPACITY :
2505	<	tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2506	<	this.counter = new LongAdder();
2507	<	this.sizeCtl = cap;
813	>	this(initialCapacity, LOAD_FACTOR, 1);
814		}
815
816		/**
#	Line 2513 | Line 819 | public class ConcurrentHashMap<K, V>
819		* @param m the map
820		*/
821		public ConcurrentHashMap(Map<? extends K, ? extends V> m) {
2516	–	this.counter = new LongAdder();
822		this.sizeCtl = DEFAULT_CAPACITY;
823	<	internalPutAll(m);
823	>	putAll(m);
824		}
825
826		/**
#	Line 2539 | Line 844 | public class ConcurrentHashMap<K, V>
844
845		/**
846		* Creates a new, empty map with an initial table size based on
847	<	* the given number of elements ({@code initialCapacity}), table
848	<	* density ({@code loadFactor}), and number of concurrently
847	>	* the given number of elements ({@code initialCapacity}), initial
848	>	* table density ({@code loadFactor}), and number of concurrently
849		* updating threads ({@code concurrencyLevel}).
850		*
851		* @param initialCapacity the initial capacity. The implementation
#	Line 2556 | Line 861 | public class ConcurrentHashMap<K, V>
861		* nonpositive
862		*/
863		public ConcurrentHashMap(int initialCapacity,
864	<	float loadFactor, int concurrencyLevel) {
864	>	float loadFactor, int concurrencyLevel) {
865		if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
866		throw new IllegalArgumentException();
867		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
#	Line 2564 | Line 869 | public class ConcurrentHashMap<K, V>
869		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
870		int cap = (size >= (long)MAXIMUM_CAPACITY) ?
871		MAXIMUM_CAPACITY : tableSizeFor((int)size);
2567	–	this.counter = new LongAdder();
872		this.sizeCtl = cap;
873		}
874
875	<	/**
2572	<	* Creates a new {@link Set} backed by a ConcurrentHashMap
2573	<	* from the given type to {@code Boolean.TRUE}.
2574	<	*
2575	<	* @return the new set
2576	<	*/
2577	<	public static <K> KeySetView<K,Boolean> newKeySet() {
2578	<	return new KeySetView<K,Boolean>(new ConcurrentHashMap<K,Boolean>(),
2579	<	Boolean.TRUE);
2580	<	}
2581	<
2582	<	/**
2583	<	* Creates a new {@link Set} backed by a ConcurrentHashMap
2584	<	* from the given type to {@code Boolean.TRUE}.
2585	<	*
2586	<	* @param initialCapacity The implementation performs internal
2587	<	* sizing to accommodate this many elements.
2588	<	* @throws IllegalArgumentException if the initial capacity of
2589	<	* elements is negative
2590	<	* @return the new set
2591	<	*/
2592	<	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2593	<	return new KeySetView<K,Boolean>(new ConcurrentHashMap<K,Boolean>(initialCapacity),
2594	<	Boolean.TRUE);
2595	<	}
2596	<
2597	<	/**
2598	<	* {@inheritDoc}
2599	<	*/
2600	<	public boolean isEmpty() {
2601	<	return counter.sum() <= 0L; // ignore transient negative values
2602	<	}
875	>	// Original (since JDK1.2) Map methods
876
877		/**
878		* {@inheritDoc}
879		*/
880		public int size() {
881	<	long n = counter.sum();
881	>	long n = sumCount();
882		return ((n < 0L) ? 0 :
883		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
884		(int)n);
885		}
886
887		/**
888	<	* Returns the number of mappings. This method should be used
2616	<	* instead of {@link #size} because a ConcurrentHashMap may
2617	<	* contain more mappings than can be represented as an int. The
2618	<	* value returned is a snapshot; the actual count may differ if
2619	<	* there are ongoing concurrent insertions or removals.
2620	<	*
2621	<	* @return the number of mappings
888	>	* {@inheritDoc}
889		*/
890	<	public long mappingCount() {
891	<	long n = counter.sum();
2625	<	return (n < 0L) ? 0L : n; // ignore transient negative values
890	>	public boolean isEmpty() {
891	>	return sumCount() <= 0L; // ignore transient negative values
892		}
893
894		/**
#	Line 2636 | Line 902 | public class ConcurrentHashMap<K, V>
902		*
903		* @throws NullPointerException if the specified key is null
904		*/
905	<	@SuppressWarnings("unchecked") public V get(Object key) {
906	<	if (key == null)
907	<	throw new NullPointerException();
908	<	return (V)internalGet(key);
909	<	}
910	<
911	<	/**
912	<	* Returns the value to which the specified key is mapped,
913	<	* or the given defaultValue if this map contains no mapping for the key.
914	<	*
915	<	* @param key the key
916	<	* @param defaultValue the value to return if this map contains
917	<	* no mapping for the given key
918	<	* @return the mapping for the key, if present; else the defaultValue
919	<	* @throws NullPointerException if the specified key is null
920	<	*/
921	<	@SuppressWarnings("unchecked") public V getValueOrDefault(Object key, V defaultValue) {
922	<	if (key == null)
2657	<	throw new NullPointerException();
2658	<	V v = (V) internalGet(key);
2659	<	return v == null ? defaultValue : v;
905	>	public V get(Object key) {
906	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
907	>	int h = spread(key.hashCode());
908	>	if ((tab = table) != null && (n = tab.length) > 0 &&
909	>	(e = tabAt(tab, (n - 1) & h)) != null) {
910	>	if ((eh = e.hash) == h) {
911	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
912	>	return e.val;
913	>	}
914	>	else if (eh < 0)
915	>	return (p = e.find(h, key)) != null ? p.val : null;
916	>	while ((e = e.next) != null) {
917	>	if (e.hash == h &&
918	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
919	>	return e.val;
920	>	}
921	>	}
922	>	return null;
923		}
924
925		/**
926		* Tests if the specified object is a key in this table.
927		*
928	<	* @param  key   possible key
928	>	* @param  key possible key
929		* @return {@code true} if and only if the specified object
930		*         is a key in this table, as determined by the
931		*         {@code equals} method; {@code false} otherwise
932		* @throws NullPointerException if the specified key is null
933		*/
934		public boolean containsKey(Object key) {
935	<	if (key == null)
2673	<	throw new NullPointerException();
2674	<	return internalGet(key) != null;
935	>	return get(key) != null;
936		}
937
938		/**
#	Line 2687 | Line 948 | public class ConcurrentHashMap<K, V>
948		public boolean containsValue(Object value) {
949		if (value == null)
950		throw new NullPointerException();
951	<	Object v;
952	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
953	<	while ((v = it.advance()) != null) {
954	<	if (v == value || value.equals(v))
955	<	return true;
951	>	Node<K,V>[] t;
952	>	if ((t = table) != null) {
953	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
954	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
955	>	V v;
956	>	if ((v = p.val) == value || (v != null && value.equals(v)))
957	>	return true;
958	>	}
959		}
960		return false;
961		}
962
963		/**
2700	–	* Legacy method testing if some key maps into the specified value
2701	–	* in this table.  This method is identical in functionality to
2702	–	* {@link #containsValue}, and exists solely to ensure
2703	–	* full compatibility with class {@link java.util.Hashtable},
2704	–	* which supported this method prior to introduction of the
2705	–	* Java Collections framework.
2706	–	*
2707	–	* @param  value a value to search for
2708	–	* @return {@code true} if and only if some key maps to the
2709	–	*         {@code value} argument in this table as
2710	–	*         determined by the {@code equals} method;
2711	–	*         {@code false} otherwise
2712	–	* @throws NullPointerException if the specified value is null
2713	–	*/
2714	–	public boolean contains(Object value) {
2715	–	return containsValue(value);
2716	–	}
2717	–
2718	–	/**
964		* Maps the specified key to the specified value in this table.
965		* Neither the key nor the value can be null.
966		*
967	<	* <p> The value can be retrieved by calling the {@code get} method
967	>	* <p>The value can be retrieved by calling the {@code get} method
968		* with a key that is equal to the original key.
969		*
970		* @param key key with which the specified value is to be associated
#	Line 2728 | Line 973 | public class ConcurrentHashMap<K, V>
973		*         {@code null} if there was no mapping for {@code key}
974		* @throws NullPointerException if the specified key or value is null
975		*/
976	<	@SuppressWarnings("unchecked") public V put(K key, V value) {
977	<	if (key == null || value == null)
976	>	public V put(K key, V value) {
977	>	return putVal(key, value, false);
978	>	}
979	>
980	>	/** Implementation for put and putIfAbsent */
981	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
982	>	if (key == null || value == null) throw new NullPointerException();
983	>	int hash = spread(key.hashCode());
984	>	int binCount = 0;
985	>	for (Node<K,V>[] tab = table;;) {
986	>	Node<K,V> f; int n, i, fh; K fk; V fv;
987	>	if (tab == null || (n = tab.length) == 0)
988	>	tab = initTable();
989	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
990	>	if (casTabAt(tab, i, null, new Node<K,V>(hash, key, value)))
991	>	break;                   // no lock when adding to empty bin
992	>	}
993	>	else if ((fh = f.hash) == MOVED)
994	>	tab = helpTransfer(tab, f);
995	>	else if (onlyIfAbsent // check first node without acquiring lock
996	>	&& fh == hash
997	>	&& ((fk = f.key) == key || (fk != null && key.equals(fk)))
998	>	&& (fv = f.val) != null)
999	>	return fv;
1000	>	else {
1001	>	V oldVal = null;
1002	>	synchronized (f) {
1003	>	if (tabAt(tab, i) == f) {
1004	>	if (fh >= 0) {
1005	>	binCount = 1;
1006	>	for (Node<K,V> e = f;; ++binCount) {
1007	>	K ek;
1008	>	if (e.hash == hash &&
1009	>	((ek = e.key) == key ||
1010	>	(ek != null && key.equals(ek)))) {
1011	>	oldVal = e.val;
1012	>	if (!onlyIfAbsent)
1013	>	e.val = value;
1014	>	break;
1015	>	}
1016	>	Node<K,V> pred = e;
1017	>	if ((e = e.next) == null) {
1018	>	pred.next = new Node<K,V>(hash, key, value);
1019	>	break;
1020	>	}
1021	>	}
1022	>	}
1023	>	else if (f instanceof TreeBin) {
1024	>	Node<K,V> p;
1025	>	binCount = 2;
1026	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1027	>	value)) != null) {
1028	>	oldVal = p.val;
1029	>	if (!onlyIfAbsent)
1030	>	p.val = value;
1031	>	}
1032	>	}
1033	>	else if (f instanceof ReservationNode)
1034	>	throw new IllegalStateException("Recursive update");
1035	>	}
1036	>	}
1037	>	if (binCount != 0) {
1038	>	if (binCount >= TREEIFY_THRESHOLD)
1039	>	treeifyBin(tab, i);
1040	>	if (oldVal != null)
1041	>	return oldVal;
1042	>	break;
1043	>	}
1044	>	}
1045	>	}
1046	>	addCount(1L, binCount);
1047	>	return null;
1048	>	}
1049	>
1050	>	/**
1051	>	* Copies all of the mappings from the specified map to this one.
1052	>	* These mappings replace any mappings that this map had for any of the
1053	>	* keys currently in the specified map.
1054	>	*
1055	>	* @param m mappings to be stored in this map
1056	>	*/
1057	>	public void putAll(Map<? extends K, ? extends V> m) {
1058	>	tryPresize(m.size());
1059	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1060	>	putVal(e.getKey(), e.getValue(), false);
1061	>	}
1062	>
1063	>	/**
1064	>	* Removes the key (and its corresponding value) from this map.
1065	>	* This method does nothing if the key is not in the map.
1066	>	*
1067	>	* @param  key the key that needs to be removed
1068	>	* @return the previous value associated with {@code key}, or
1069	>	*         {@code null} if there was no mapping for {@code key}
1070	>	* @throws NullPointerException if the specified key is null
1071	>	*/
1072	>	public V remove(Object key) {
1073	>	return replaceNode(key, null, null);
1074	>	}
1075	>
1076	>	/**
1077	>	* Implementation for the four public remove/replace methods:
1078	>	* Replaces node value with v, conditional upon match of cv if
1079	>	* non-null.  If resulting value is null, delete.
1080	>	*/
1081	>	final V replaceNode(Object key, V value, Object cv) {
1082	>	int hash = spread(key.hashCode());
1083	>	for (Node<K,V>[] tab = table;;) {
1084	>	Node<K,V> f; int n, i, fh;
1085	>	if (tab == null || (n = tab.length) == 0 ||
1086	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1087	>	break;
1088	>	else if ((fh = f.hash) == MOVED)
1089	>	tab = helpTransfer(tab, f);
1090	>	else {
1091	>	V oldVal = null;
1092	>	boolean validated = false;
1093	>	synchronized (f) {
1094	>	if (tabAt(tab, i) == f) {
1095	>	if (fh >= 0) {
1096	>	validated = true;
1097	>	for (Node<K,V> e = f, pred = null;;) {
1098	>	K ek;
1099	>	if (e.hash == hash &&
1100	>	((ek = e.key) == key ||
1101	>	(ek != null && key.equals(ek)))) {
1102	>	V ev = e.val;
1103	>	if (cv == null || cv == ev ||
1104	>	(ev != null && cv.equals(ev))) {
1105	>	oldVal = ev;
1106	>	if (value != null)
1107	>	e.val = value;
1108	>	else if (pred != null)
1109	>	pred.next = e.next;
1110	>	else
1111	>	setTabAt(tab, i, e.next);
1112	>	}
1113	>	break;
1114	>	}
1115	>	pred = e;
1116	>	if ((e = e.next) == null)
1117	>	break;
1118	>	}
1119	>	}
1120	>	else if (f instanceof TreeBin) {
1121	>	validated = true;
1122	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1123	>	TreeNode<K,V> r, p;
1124	>	if ((r = t.root) != null &&
1125	>	(p = r.findTreeNode(hash, key, null)) != null) {
1126	>	V pv = p.val;
1127	>	if (cv == null || cv == pv ||
1128	>	(pv != null && cv.equals(pv))) {
1129	>	oldVal = pv;
1130	>	if (value != null)
1131	>	p.val = value;
1132	>	else if (t.removeTreeNode(p))
1133	>	setTabAt(tab, i, untreeify(t.first));
1134	>	}
1135	>	}
1136	>	}
1137	>	else if (f instanceof ReservationNode)
1138	>	throw new IllegalStateException("Recursive update");
1139	>	}
1140	>	}
1141	>	if (validated) {
1142	>	if (oldVal != null) {
1143	>	if (value == null)
1144	>	addCount(-1L, -1);
1145	>	return oldVal;
1146	>	}
1147	>	break;
1148	>	}
1149	>	}
1150	>	}
1151	>	return null;
1152	>	}
1153	>
1154	>	/**
1155	>	* Removes all of the mappings from this map.
1156	>	*/
1157	>	public void clear() {
1158	>	long delta = 0L; // negative number of deletions
1159	>	int i = 0;
1160	>	Node<K,V>[] tab = table;
1161	>	while (tab != null && i < tab.length) {
1162	>	int fh;
1163	>	Node<K,V> f = tabAt(tab, i);
1164	>	if (f == null)
1165	>	++i;
1166	>	else if ((fh = f.hash) == MOVED) {
1167	>	tab = helpTransfer(tab, f);
1168	>	i = 0; // restart
1169	>	}
1170	>	else {
1171	>	synchronized (f) {
1172	>	if (tabAt(tab, i) == f) {
1173	>	Node<K,V> p = (fh >= 0 ? f :
1174	>	(f instanceof TreeBin) ?
1175	>	((TreeBin<K,V>)f).first : null);
1176	>	while (p != null) {
1177	>	--delta;
1178	>	p = p.next;
1179	>	}
1180	>	setTabAt(tab, i++, null);
1181	>	}
1182	>	}
1183	>	}
1184	>	}
1185	>	if (delta != 0L)
1186	>	addCount(delta, -1);
1187	>	}
1188	>
1189	>	/**
1190	>	* Returns a {@link Set} view of the keys contained in this map.
1191	>	* The set is backed by the map, so changes to the map are
1192	>	* reflected in the set, and vice-versa. The set supports element
1193	>	* removal, which removes the corresponding mapping from this map,
1194	>	* via the {@code Iterator.remove}, {@code Set.remove},
1195	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1196	>	* operations.  It does not support the {@code add} or
1197	>	* {@code addAll} operations.
1198	>	*
1199	>	* <p>The view's iterators and spliterators are
1200	>	* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>.
1201	>	*
1202	>	* <p>The view's {@code spliterator} reports {@link Spliterator#CONCURRENT},
1203	>	* {@link Spliterator#DISTINCT}, and {@link Spliterator#NONNULL}.
1204	>	*
1205	>	* @return the set view
1206	>	*/
1207	>	public KeySetView<K,V> keySet() {
1208	>	KeySetView<K,V> ks;
1209	>	if ((ks = keySet) != null) return ks;
1210	>	return keySet = new KeySetView<K,V>(this, null);
1211	>	}
1212	>
1213	>	/**
1214	>	* Returns a {@link Collection} view of the values contained in this map.
1215	>	* The collection is backed by the map, so changes to the map are
1216	>	* reflected in the collection, and vice-versa.  The collection
1217	>	* supports element removal, which removes the corresponding
1218	>	* mapping from this map, via the {@code Iterator.remove},
1219	>	* {@code Collection.remove}, {@code removeAll},
1220	>	* {@code retainAll}, and {@code clear} operations.  It does not
1221	>	* support the {@code add} or {@code addAll} operations.
1222	>	*
1223	>	* <p>The view's iterators and spliterators are
1224	>	* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>.
1225	>	*
1226	>	* <p>The view's {@code spliterator} reports {@link Spliterator#CONCURRENT}
1227	>	* and {@link Spliterator#NONNULL}.
1228	>	*
1229	>	* @return the collection view
1230	>	*/
1231	>	public Collection<V> values() {
1232	>	ValuesView<K,V> vs;
1233	>	if ((vs = values) != null) return vs;
1234	>	return values = new ValuesView<K,V>(this);
1235	>	}
1236	>
1237	>	/**
1238	>	* Returns a {@link Set} view of the mappings contained in this map.
1239	>	* The set is backed by the map, so changes to the map are
1240	>	* reflected in the set, and vice-versa.  The set supports element
1241	>	* removal, which removes the corresponding mapping from the map,
1242	>	* via the {@code Iterator.remove}, {@code Set.remove},
1243	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1244	>	* operations.
1245	>	*
1246	>	* <p>The view's iterators and spliterators are
1247	>	* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>.
1248	>	*
1249	>	* <p>The view's {@code spliterator} reports {@link Spliterator#CONCURRENT},
1250	>	* {@link Spliterator#DISTINCT}, and {@link Spliterator#NONNULL}.
1251	>	*
1252	>	* @return the set view
1253	>	*/
1254	>	public Set<Map.Entry<K,V>> entrySet() {
1255	>	EntrySetView<K,V> es;
1256	>	if ((es = entrySet) != null) return es;
1257	>	return entrySet = new EntrySetView<K,V>(this);
1258	>	}
1259	>
1260	>	/**
1261	>	* Returns the hash code value for this {@link Map}, i.e.,
1262	>	* the sum of, for each key-value pair in the map,
1263	>	* {@code key.hashCode() ^ value.hashCode()}.
1264	>	*
1265	>	* @return the hash code value for this map
1266	>	*/
1267	>	public int hashCode() {
1268	>	int h = 0;
1269	>	Node<K,V>[] t;
1270	>	if ((t = table) != null) {
1271	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1272	>	for (Node<K,V> p; (p = it.advance()) != null; )
1273	>	h += p.key.hashCode() ^ p.val.hashCode();
1274	>	}
1275	>	return h;
1276	>	}
1277	>
1278	>	/**
1279	>	* Returns a string representation of this map.  The string
1280	>	* representation consists of a list of key-value mappings (in no
1281	>	* particular order) enclosed in braces ("{@code {}}").  Adjacent
1282	>	* mappings are separated by the characters {@code ", "} (comma
1283	>	* and space).  Each key-value mapping is rendered as the key
1284	>	* followed by an equals sign ("{@code =}") followed by the
1285	>	* associated value.
1286	>	*
1287	>	* @return a string representation of this map
1288	>	*/
1289	>	public String toString() {
1290	>	Node<K,V>[] t;
1291	>	int f = (t = table) == null ? 0 : t.length;
1292	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1293	>	StringBuilder sb = new StringBuilder();
1294	>	sb.append('{');
1295	>	Node<K,V> p;
1296	>	if ((p = it.advance()) != null) {
1297	>	for (;;) {
1298	>	K k = p.key;
1299	>	V v = p.val;
1300	>	sb.append(k == this ? "(this Map)" : k);
1301	>	sb.append('=');
1302	>	sb.append(v == this ? "(this Map)" : v);
1303	>	if ((p = it.advance()) == null)
1304	>	break;
1305	>	sb.append(',').append(' ');
1306	>	}
1307	>	}
1308	>	return sb.append('}').toString();
1309	>	}
1310	>
1311	>	/**
1312	>	* Compares the specified object with this map for equality.
1313	>	* Returns {@code true} if the given object is a map with the same
1314	>	* mappings as this map.  This operation may return misleading
1315	>	* results if either map is concurrently modified during execution
1316	>	* of this method.
1317	>	*
1318	>	* @param o object to be compared for equality with this map
1319	>	* @return {@code true} if the specified object is equal to this map
1320	>	*/
1321	>	public boolean equals(Object o) {
1322	>	if (o != this) {
1323	>	if (!(o instanceof Map))
1324	>	return false;
1325	>	Map<?,?> m = (Map<?,?>) o;
1326	>	Node<K,V>[] t;
1327	>	int f = (t = table) == null ? 0 : t.length;
1328	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1329	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1330	>	V val = p.val;
1331	>	Object v = m.get(p.key);
1332	>	if (v == null || (v != val && !v.equals(val)))
1333	>	return false;
1334	>	}
1335	>	for (Map.Entry<?,?> e : m.entrySet()) {
1336	>	Object mk, mv, v;
1337	>	if ((mk = e.getKey()) == null ||
1338	>	(mv = e.getValue()) == null ||
1339	>	(v = get(mk)) == null ||
1340	>	(mv != v && !mv.equals(v)))
1341	>	return false;
1342	>	}
1343	>	}
1344	>	return true;
1345	>	}
1346	>
1347	>	/**
1348	>	* Stripped-down version of helper class used in previous version,
1349	>	* declared for the sake of serialization compatibility.
1350	>	*/
1351	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1352	>	private static final long serialVersionUID = 2249069246763182397L;
1353	>	final float loadFactor;
1354	>	Segment(float lf) { this.loadFactor = lf; }
1355	>	}
1356	>
1357	>	/**
1358	>	* Saves this map to a stream (that is, serializes it).
1359	>	*
1360	>	* @param s the stream
1361	>	* @throws java.io.IOException if an I/O error occurs
1362	>	* @serialData
1363	>	* the serialized fields, followed by the key (Object) and value
1364	>	* (Object) for each key-value mapping, followed by a null pair.
1365	>	* The key-value mappings are emitted in no particular order.
1366	>	*/
1367	>	private void writeObject(java.io.ObjectOutputStream s)
1368	>	throws java.io.IOException {
1369	>	// For serialization compatibility
1370	>	// Emulate segment calculation from previous version of this class
1371	>	int sshift = 0;
1372	>	int ssize = 1;
1373	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1374	>	++sshift;
1375	>	ssize <<= 1;
1376	>	}
1377	>	int segmentShift = 32 - sshift;
1378	>	int segmentMask = ssize - 1;
1379	>	@SuppressWarnings("unchecked")
1380	>	Segment<K,V>[] segments = (Segment<K,V>[])
1381	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1382	>	for (int i = 0; i < segments.length; ++i)
1383	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1384	>	java.io.ObjectOutputStream.PutField streamFields = s.putFields();
1385	>	streamFields.put("segments", segments);
1386	>	streamFields.put("segmentShift", segmentShift);
1387	>	streamFields.put("segmentMask", segmentMask);
1388	>	s.writeFields();
1389	>
1390	>	Node<K,V>[] t;
1391	>	if ((t = table) != null) {
1392	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1393	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1394	>	s.writeObject(p.key);
1395	>	s.writeObject(p.val);
1396	>	}
1397	>	}
1398	>	s.writeObject(null);
1399	>	s.writeObject(null);
1400	>	}
1401	>
1402	>	/**
1403	>	* Reconstitutes this map from a stream (that is, deserializes it).
1404	>	* @param s the stream
1405	>	* @throws ClassNotFoundException if the class of a serialized object
1406	>	*         could not be found
1407	>	* @throws java.io.IOException if an I/O error occurs
1408	>	*/
1409	>	private void readObject(java.io.ObjectInputStream s)
1410	>	throws java.io.IOException, ClassNotFoundException {
1411	>	/*
1412	>	* To improve performance in typical cases, we create nodes
1413	>	* while reading, then place in table once size is known.
1414	>	* However, we must also validate uniqueness and deal with
1415	>	* overpopulated bins while doing so, which requires
1416	>	* specialized versions of putVal mechanics.
1417	>	*/
1418	>	sizeCtl = -1; // force exclusion for table construction
1419	>	s.defaultReadObject();
1420	>	long size = 0L;
1421	>	Node<K,V> p = null;
1422	>	for (;;) {
1423	>	@SuppressWarnings("unchecked")
1424	>	K k = (K) s.readObject();
1425	>	@SuppressWarnings("unchecked")
1426	>	V v = (V) s.readObject();
1427	>	if (k != null && v != null) {
1428	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1429	>	++size;
1430	>	}
1431	>	else
1432	>	break;
1433	>	}
1434	>	if (size == 0L)
1435	>	sizeCtl = 0;
1436	>	else {
1437	>	long ts = (long)(1.0 + size / LOAD_FACTOR);
1438	>	int n = (ts >= (long)MAXIMUM_CAPACITY) ?
1439	>	MAXIMUM_CAPACITY : tableSizeFor((int)ts);
1440	>	@SuppressWarnings("unchecked")
1441	>	Node<K,V>[] tab = (Node<K,V>[])new Node<?,?>[n];
1442	>	int mask = n - 1;
1443	>	long added = 0L;
1444	>	while (p != null) {
1445	>	boolean insertAtFront;
1446	>	Node<K,V> next = p.next, first;
1447	>	int h = p.hash, j = h & mask;
1448	>	if ((first = tabAt(tab, j)) == null)
1449	>	insertAtFront = true;
1450	>	else {
1451	>	K k = p.key;
1452	>	if (first.hash < 0) {
1453	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1454	>	if (t.putTreeVal(h, k, p.val) == null)
1455	>	++added;
1456	>	insertAtFront = false;
1457	>	}
1458	>	else {
1459	>	int binCount = 0;
1460	>	insertAtFront = true;
1461	>	Node<K,V> q; K qk;
1462	>	for (q = first; q != null; q = q.next) {
1463	>	if (q.hash == h &&
1464	>	((qk = q.key) == k ||
1465	>	(qk != null && k.equals(qk)))) {
1466	>	insertAtFront = false;
1467	>	break;
1468	>	}
1469	>	++binCount;
1470	>	}
1471	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1472	>	insertAtFront = false;
1473	>	++added;
1474	>	p.next = first;
1475	>	TreeNode<K,V> hd = null, tl = null;
1476	>	for (q = p; q != null; q = q.next) {
1477	>	TreeNode<K,V> t = new TreeNode<K,V>
1478	>	(q.hash, q.key, q.val, null, null);
1479	>	if ((t.prev = tl) == null)
1480	>	hd = t;
1481	>	else
1482	>	tl.next = t;
1483	>	tl = t;
1484	>	}
1485	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1486	>	}
1487	>	}
1488	>	}
1489	>	if (insertAtFront) {
1490	>	++added;
1491	>	p.next = first;
1492	>	setTabAt(tab, j, p);
1493	>	}
1494	>	p = next;
1495	>	}
1496	>	table = tab;
1497	>	sizeCtl = n - (n >>> 2);
1498	>	baseCount = added;
1499	>	}
1500	>	}
1501	>
1502	>	// ConcurrentMap methods
1503	>
1504	>	/**
1505	>	* {@inheritDoc}
1506	>	*
1507	>	* @return the previous value associated with the specified key,
1508	>	*         or {@code null} if there was no mapping for the key
1509	>	* @throws NullPointerException if the specified key or value is null
1510	>	*/
1511	>	public V putIfAbsent(K key, V value) {
1512	>	return putVal(key, value, true);
1513	>	}
1514	>
1515	>	/**
1516	>	* {@inheritDoc}
1517	>	*
1518	>	* @throws NullPointerException if the specified key is null
1519	>	*/
1520	>	public boolean remove(Object key, Object value) {
1521	>	if (key == null)
1522	>	throw new NullPointerException();
1523	>	return value != null && replaceNode(key, null, value) != null;
1524	>	}
1525	>
1526	>	/**
1527	>	* {@inheritDoc}
1528	>	*
1529	>	* @throws NullPointerException if any of the arguments are null
1530	>	*/
1531	>	public boolean replace(K key, V oldValue, V newValue) {
1532	>	if (key == null || oldValue == null || newValue == null)
1533		throw new NullPointerException();
1534	<	return (V)internalPut(key, value);
1534	>	return replaceNode(key, newValue, oldValue) != null;
1535		}
1536
1537		/**
#	Line 2741 | Line 1541 | public class ConcurrentHashMap<K, V>
1541		*         or {@code null} if there was no mapping for the key
1542		* @throws NullPointerException if the specified key or value is null
1543		*/
1544	<	@SuppressWarnings("unchecked") public V putIfAbsent(K key, V value) {
1544	>	public V replace(K key, V value) {
1545		if (key == null || value == null)
1546		throw new NullPointerException();
1547	<	return (V)internalPutIfAbsent(key, value);
1547	>	return replaceNode(key, value, null);
1548		}
1549
1550	+	// Overrides of JDK8+ Map extension method defaults
1551	+
1552		/**
1553	<	* Copies all of the mappings from the specified map to this one.
1554	<	* These mappings replace any mappings that this map had for any of the
1555	<	* keys currently in the specified map.
1553	>	* Returns the value to which the specified key is mapped, or the
1554	>	* given default value if this map contains no mapping for the
1555	>	* key.
1556		*
1557	<	* @param m mappings to be stored in this map
1557	>	* @param key the key whose associated value is to be returned
1558	>	* @param defaultValue the value to return if this map contains
1559	>	* no mapping for the given key
1560	>	* @return the mapping for the key, if present; else the default value
1561	>	* @throws NullPointerException if the specified key is null
1562		*/
1563	<	public void putAll(Map<? extends K, ? extends V> m) {
1564	<	internalPutAll(m);
1563	>	public V getOrDefault(Object key, V defaultValue) {
1564	>	V v;
1565	>	return (v = get(key)) == null ? defaultValue : v;
1566	>	}
1567	>
1568	>	public void forEach(BiConsumer<? super K, ? super V> action) {
1569	>	if (action == null) throw new NullPointerException();
1570	>	Node<K,V>[] t;
1571	>	if ((t = table) != null) {
1572	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1573	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1574	>	action.accept(p.key, p.val);
1575	>	}
1576	>	}
1577	>	}
1578	>
1579	>	public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {
1580	>	if (function == null) throw new NullPointerException();
1581	>	Node<K,V>[] t;
1582	>	if ((t = table) != null) {
1583	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1584	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1585	>	V oldValue = p.val;
1586	>	for (K key = p.key;;) {
1587	>	V newValue = function.apply(key, oldValue);
1588	>	if (newValue == null)
1589	>	throw new NullPointerException();
1590	>	if (replaceNode(key, newValue, oldValue) != null ||
1591	>	(oldValue = get(key)) == null)
1592	>	break;
1593	>	}
1594	>	}
1595	>	}
1596	>	}
1597	>
1598	>	/**
1599	>	* Helper method for EntrySetView.removeIf.
1600	>	*/
1601	>	boolean removeEntryIf(Predicate<? super Entry<K,V>> function) {
1602	>	if (function == null) throw new NullPointerException();
1603	>	Node<K,V>[] t;
1604	>	boolean removed = false;
1605	>	if ((t = table) != null) {
1606	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1607	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1608	>	K k = p.key;
1609	>	V v = p.val;
1610	>	Map.Entry<K,V> e = new AbstractMap.SimpleImmutableEntry<>(k, v);
1611	>	if (function.test(e) && replaceNode(k, null, v) != null)
1612	>	removed = true;
1613	>	}
1614	>	}
1615	>	return removed;
1616	>	}
1617	>
1618	>	/**
1619	>	* Helper method for ValuesView.removeIf.
1620	>	*/
1621	>	boolean removeValueIf(Predicate<? super V> function) {
1622	>	if (function == null) throw new NullPointerException();
1623	>	Node<K,V>[] t;
1624	>	boolean removed = false;
1625	>	if ((t = table) != null) {
1626	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1627	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1628	>	K k = p.key;
1629	>	V v = p.val;
1630	>	if (function.test(v) && replaceNode(k, null, v) != null)
1631	>	removed = true;
1632	>	}
1633	>	}
1634	>	return removed;
1635		}
1636
1637		/**
1638		* If the specified key is not already associated with a value,
1639	<	* computes its value using the given mappingFunction and enters
1640	<	* it into the map unless null.  This is equivalent to
1641	<	* <pre> {@code
1642	<	* if (map.containsKey(key))
1643	<	*   return map.get(key);
1644	<	* value = mappingFunction.apply(key);
1645	<	* if (value != null)
2770	<	*   map.put(key, value);
2771	<	* return value;}</pre>
2772	<	*
2773	<	* except that the action is performed atomically.  If the
2774	<	* function returns {@code null} no mapping is recorded. If the
2775	<	* function itself throws an (unchecked) exception, the exception
2776	<	* is rethrown to its caller, and no mapping is recorded.  Some
2777	<	* attempted update operations on this map by other threads may be
2778	<	* blocked while computation is in progress, so the computation
2779	<	* should be short and simple, and must not attempt to update any
2780	<	* other mappings of this Map. The most appropriate usage is to
2781	<	* construct a new object serving as an initial mapped value, or
2782	<	* memoized result, as in:
2783	<	*
2784	<	*  <pre> {@code
2785	<	* map.computeIfAbsent(key, new Fun<K, V>() {
2786	<	*   public V map(K k) { return new Value(f(k)); }});}</pre>
1639	>	* attempts to compute its value using the given mapping function
1640	>	* and enters it into this map unless {@code null}.  The entire
1641	>	* method invocation is performed atomically, so the function is
1642	>	* applied at most once per key.  Some attempted update operations
1643	>	* on this map by other threads may be blocked while computation
1644	>	* is in progress, so the computation should be short and simple,
1645	>	* and must not attempt to update any other mappings of this map.
1646		*
1647		* @param key key with which the specified value is to be associated
1648		* @param mappingFunction the function to compute a value
#	Line 2797 | Line 1656 | public class ConcurrentHashMap<K, V>
1656		* @throws RuntimeException or Error if the mappingFunction does so,
1657		*         in which case the mapping is left unestablished
1658		*/
1659	<	@SuppressWarnings("unchecked") public V computeIfAbsent
2801	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
1659	>	public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
1660		if (key == null || mappingFunction == null)
1661		throw new NullPointerException();
1662	<	return (V)internalComputeIfAbsent(key, mappingFunction);
1662	>	int h = spread(key.hashCode());
1663	>	V val = null;
1664	>	int binCount = 0;
1665	>	for (Node<K,V>[] tab = table;;) {
1666	>	Node<K,V> f; int n, i, fh; K fk; V fv;
1667	>	if (tab == null || (n = tab.length) == 0)
1668	>	tab = initTable();
1669	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1670	>	Node<K,V> r = new ReservationNode<K,V>();
1671	>	synchronized (r) {
1672	>	if (casTabAt(tab, i, null, r)) {
1673	>	binCount = 1;
1674	>	Node<K,V> node = null;
1675	>	try {
1676	>	if ((val = mappingFunction.apply(key)) != null)
1677	>	node = new Node<K,V>(h, key, val);
1678	>	} finally {
1679	>	setTabAt(tab, i, node);
1680	>	}
1681	>	}
1682	>	}
1683	>	if (binCount != 0)
1684	>	break;
1685	>	}
1686	>	else if ((fh = f.hash) == MOVED)
1687	>	tab = helpTransfer(tab, f);
1688	>	else if (fh == h    // check first node without acquiring lock
1689	>	&& ((fk = f.key) == key || (fk != null && key.equals(fk)))
1690	>	&& (fv = f.val) != null)
1691	>	return fv;
1692	>	else {
1693	>	boolean added = false;
1694	>	synchronized (f) {
1695	>	if (tabAt(tab, i) == f) {
1696	>	if (fh >= 0) {
1697	>	binCount = 1;
1698	>	for (Node<K,V> e = f;; ++binCount) {
1699	>	K ek;
1700	>	if (e.hash == h &&
1701	>	((ek = e.key) == key ||
1702	>	(ek != null && key.equals(ek)))) {
1703	>	val = e.val;
1704	>	break;
1705	>	}
1706	>	Node<K,V> pred = e;
1707	>	if ((e = e.next) == null) {
1708	>	if ((val = mappingFunction.apply(key)) != null) {
1709	>	if (pred.next != null)
1710	>	throw new IllegalStateException("Recursive update");
1711	>	added = true;
1712	>	pred.next = new Node<K,V>(h, key, val);
1713	>	}
1714	>	break;
1715	>	}
1716	>	}
1717	>	}
1718	>	else if (f instanceof TreeBin) {
1719	>	binCount = 2;
1720	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1721	>	TreeNode<K,V> r, p;
1722	>	if ((r = t.root) != null &&
1723	>	(p = r.findTreeNode(h, key, null)) != null)
1724	>	val = p.val;
1725	>	else if ((val = mappingFunction.apply(key)) != null) {
1726	>	added = true;
1727	>	t.putTreeVal(h, key, val);
1728	>	}
1729	>	}
1730	>	else if (f instanceof ReservationNode)
1731	>	throw new IllegalStateException("Recursive update");
1732	>	}
1733	>	}
1734	>	if (binCount != 0) {
1735	>	if (binCount >= TREEIFY_THRESHOLD)
1736	>	treeifyBin(tab, i);
1737	>	if (!added)
1738	>	return val;
1739	>	break;
1740	>	}
1741	>	}
1742	>	}
1743	>	if (val != null)
1744	>	addCount(1L, binCount);
1745	>	return val;
1746		}
1747
1748		/**
1749	<	* If the given key is present, computes a new mapping value given a key and
1750	<	* its current mapped value. This is equivalent to
1751	<	*  <pre> {@code
1752	<	*   if (map.containsKey(key)) {
1753	<	*     value = remappingFunction.apply(key, map.get(key));
1754	<	*     if (value != null)
1755	<	*       map.put(key, value);
2815	<	*     else
2816	<	*       map.remove(key);
2817	<	*   }
2818	<	* }</pre>
2819	<	*
2820	<	* except that the action is performed atomically.  If the
2821	<	* function returns {@code null}, the mapping is removed.  If the
2822	<	* function itself throws an (unchecked) exception, the exception
2823	<	* is rethrown to its caller, and the current mapping is left
2824	<	* unchanged.  Some attempted update operations on this map by
2825	<	* other threads may be blocked while computation is in progress,
2826	<	* so the computation should be short and simple, and must not
2827	<	* attempt to update any other mappings of this Map. For example,
2828	<	* to either create or append new messages to a value mapping:
1749	>	* If the value for the specified key is present, attempts to
1750	>	* compute a new mapping given the key and its current mapped
1751	>	* value.  The entire method invocation is performed atomically.
1752	>	* Some attempted update operations on this map by other threads
1753	>	* may be blocked while computation is in progress, so the
1754	>	* computation should be short and simple, and must not attempt to
1755	>	* update any other mappings of this map.
1756		*
1757	<	* @param key key with which the specified value is to be associated
1757	>	* @param key key with which a value may be associated
1758		* @param remappingFunction the function to compute a value
1759		* @return the new value associated with the specified key, or null if none
1760		* @throws NullPointerException if the specified key or remappingFunction
#	Line 2838 | Line 1765 | public class ConcurrentHashMap<K, V>
1765		* @throws RuntimeException or Error if the remappingFunction does so,
1766		*         in which case the mapping is unchanged
1767		*/
1768	<	@SuppressWarnings("unchecked") public V computeIfPresent
2842	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1768	>	public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
1769		if (key == null || remappingFunction == null)
1770		throw new NullPointerException();
1771	<	return (V)internalCompute(key, true, remappingFunction);
1771	>	int h = spread(key.hashCode());
1772	>	V val = null;
1773	>	int delta = 0;
1774	>	int binCount = 0;
1775	>	for (Node<K,V>[] tab = table;;) {
1776	>	Node<K,V> f; int n, i, fh;
1777	>	if (tab == null || (n = tab.length) == 0)
1778	>	tab = initTable();
1779	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1780	>	break;
1781	>	else if ((fh = f.hash) == MOVED)
1782	>	tab = helpTransfer(tab, f);
1783	>	else {
1784	>	synchronized (f) {
1785	>	if (tabAt(tab, i) == f) {
1786	>	if (fh >= 0) {
1787	>	binCount = 1;
1788	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1789	>	K ek;
1790	>	if (e.hash == h &&
1791	>	((ek = e.key) == key ||
1792	>	(ek != null && key.equals(ek)))) {
1793	>	val = remappingFunction.apply(key, e.val);
1794	>	if (val != null)
1795	>	e.val = val;
1796	>	else {
1797	>	delta = -1;
1798	>	Node<K,V> en = e.next;
1799	>	if (pred != null)
1800	>	pred.next = en;
1801	>	else
1802	>	setTabAt(tab, i, en);
1803	>	}
1804	>	break;
1805	>	}
1806	>	pred = e;
1807	>	if ((e = e.next) == null)
1808	>	break;
1809	>	}
1810	>	}
1811	>	else if (f instanceof TreeBin) {
1812	>	binCount = 2;
1813	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1814	>	TreeNode<K,V> r, p;
1815	>	if ((r = t.root) != null &&
1816	>	(p = r.findTreeNode(h, key, null)) != null) {
1817	>	val = remappingFunction.apply(key, p.val);
1818	>	if (val != null)
1819	>	p.val = val;
1820	>	else {
1821	>	delta = -1;
1822	>	if (t.removeTreeNode(p))
1823	>	setTabAt(tab, i, untreeify(t.first));
1824	>	}
1825	>	}
1826	>	}
1827	>	else if (f instanceof ReservationNode)
1828	>	throw new IllegalStateException("Recursive update");
1829	>	}
1830	>	}
1831	>	if (binCount != 0)
1832	>	break;
1833	>	}
1834	>	}
1835	>	if (delta != 0)
1836	>	addCount((long)delta, binCount);
1837	>	return val;
1838		}
1839
1840		/**
1841	<	* Computes a new mapping value given a key and
1842	<	* its current mapped value (or {@code null} if there is no current
1843	<	* mapping). This is equivalent to
1844	<	*  <pre> {@code
1845	<	*   value = remappingFunction.apply(key, map.get(key));
1846	<	*   if (value != null)
1847	<	*     map.put(key, value);
2856	<	*   else
2857	<	*     map.remove(key);
2858	<	* }</pre>
2859	<	*
2860	<	* except that the action is performed atomically.  If the
2861	<	* function returns {@code null}, the mapping is removed.  If the
2862	<	* function itself throws an (unchecked) exception, the exception
2863	<	* is rethrown to its caller, and the current mapping is left
2864	<	* unchanged.  Some attempted update operations on this map by
2865	<	* other threads may be blocked while computation is in progress,
2866	<	* so the computation should be short and simple, and must not
2867	<	* attempt to update any other mappings of this Map. For example,
2868	<	* to either create or append new messages to a value mapping:
2869	<	*
2870	<	* <pre> {@code
2871	<	* Map<Key, String> map = ...;
2872	<	* final String msg = ...;
2873	<	* map.compute(key, new BiFun<Key, String, String>() {
2874	<	*   public String apply(Key k, String v) {
2875	<	*    return (v == null) ? msg : v + msg;});}}</pre>
1841	>	* Attempts to compute a mapping for the specified key and its
1842	>	* current mapped value (or {@code null} if there is no current
1843	>	* mapping). The entire method invocation is performed atomically.
1844	>	* Some attempted update operations on this map by other threads
1845	>	* may be blocked while computation is in progress, so the
1846	>	* computation should be short and simple, and must not attempt to
1847	>	* update any other mappings of this Map.
1848		*
1849		* @param key key with which the specified value is to be associated
1850		* @param remappingFunction the function to compute a value
#	Line 2885 | Line 1857 | public class ConcurrentHashMap<K, V>
1857		* @throws RuntimeException or Error if the remappingFunction does so,
1858		*         in which case the mapping is unchanged
1859		*/
1860	<	@SuppressWarnings("unchecked") public V compute
1861	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1860	>	public V compute(K key,
1861	>	BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
1862		if (key == null || remappingFunction == null)
1863		throw new NullPointerException();
1864	<	return (V)internalCompute(key, false, remappingFunction);
1864	>	int h = spread(key.hashCode());
1865	>	V val = null;
1866	>	int delta = 0;
1867	>	int binCount = 0;
1868	>	for (Node<K,V>[] tab = table;;) {
1869	>	Node<K,V> f; int n, i, fh;
1870	>	if (tab == null || (n = tab.length) == 0)
1871	>	tab = initTable();
1872	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1873	>	Node<K,V> r = new ReservationNode<K,V>();
1874	>	synchronized (r) {
1875	>	if (casTabAt(tab, i, null, r)) {
1876	>	binCount = 1;
1877	>	Node<K,V> node = null;
1878	>	try {
1879	>	if ((val = remappingFunction.apply(key, null)) != null) {
1880	>	delta = 1;
1881	>	node = new Node<K,V>(h, key, val);
1882	>	}
1883	>	} finally {
1884	>	setTabAt(tab, i, node);
1885	>	}
1886	>	}
1887	>	}
1888	>	if (binCount != 0)
1889	>	break;
1890	>	}
1891	>	else if ((fh = f.hash) == MOVED)
1892	>	tab = helpTransfer(tab, f);
1893	>	else {
1894	>	synchronized (f) {
1895	>	if (tabAt(tab, i) == f) {
1896	>	if (fh >= 0) {
1897	>	binCount = 1;
1898	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1899	>	K ek;
1900	>	if (e.hash == h &&
1901	>	((ek = e.key) == key ||
1902	>	(ek != null && key.equals(ek)))) {
1903	>	val = remappingFunction.apply(key, e.val);
1904	>	if (val != null)
1905	>	e.val = val;
1906	>	else {
1907	>	delta = -1;
1908	>	Node<K,V> en = e.next;
1909	>	if (pred != null)
1910	>	pred.next = en;
1911	>	else
1912	>	setTabAt(tab, i, en);
1913	>	}
1914	>	break;
1915	>	}
1916	>	pred = e;
1917	>	if ((e = e.next) == null) {
1918	>	val = remappingFunction.apply(key, null);
1919	>	if (val != null) {
1920	>	if (pred.next != null)
1921	>	throw new IllegalStateException("Recursive update");
1922	>	delta = 1;
1923	>	pred.next = new Node<K,V>(h, key, val);
1924	>	}
1925	>	break;
1926	>	}
1927	>	}
1928	>	}
1929	>	else if (f instanceof TreeBin) {
1930	>	binCount = 1;
1931	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1932	>	TreeNode<K,V> r, p;
1933	>	if ((r = t.root) != null)
1934	>	p = r.findTreeNode(h, key, null);
1935	>	else
1936	>	p = null;
1937	>	V pv = (p == null) ? null : p.val;
1938	>	val = remappingFunction.apply(key, pv);
1939	>	if (val != null) {
1940	>	if (p != null)
1941	>	p.val = val;
1942	>	else {
1943	>	delta = 1;
1944	>	t.putTreeVal(h, key, val);
1945	>	}
1946	>	}
1947	>	else if (p != null) {
1948	>	delta = -1;
1949	>	if (t.removeTreeNode(p))
1950	>	setTabAt(tab, i, untreeify(t.first));
1951	>	}
1952	>	}
1953	>	else if (f instanceof ReservationNode)
1954	>	throw new IllegalStateException("Recursive update");
1955	>	}
1956	>	}
1957	>	if (binCount != 0) {
1958	>	if (binCount >= TREEIFY_THRESHOLD)
1959	>	treeifyBin(tab, i);
1960	>	break;
1961	>	}
1962	>	}
1963	>	}
1964	>	if (delta != 0)
1965	>	addCount((long)delta, binCount);
1966	>	return val;
1967		}
1968
1969		/**
1970	<	* If the specified key is not already associated
1971	<	* with a value, associate it with the given value.
1972	<	* Otherwise, replace the value with the results of
1973	<	* the given remapping function. This is equivalent to:
1974	<	*  <pre> {@code
1975	<	*   if (!map.containsKey(key))
1976	<	*     map.put(value);
1977	<	*   else {
1978	<	*     newValue = remappingFunction.apply(map.get(key), value);
1979	<	*     if (value != null)
1980	<	*       map.put(key, value);
1981	<	*     else
1982	<	*       map.remove(key);
1983	<	*   }
1984	<	* }</pre>
1985	<	* except that the action is performed atomically.  If the
1986	<	* function returns {@code null}, the mapping is removed.  If the
1987	<	* function itself throws an (unchecked) exception, the exception
2914	<	* is rethrown to its caller, and the current mapping is left
2915	<	* unchanged.  Some attempted update operations on this map by
2916	<	* other threads may be blocked while computation is in progress,
2917	<	* so the computation should be short and simple, and must not
2918	<	* attempt to update any other mappings of this Map.
1970	>	* If the specified key is not already associated with a
1971	>	* (non-null) value, associates it with the given value.
1972	>	* Otherwise, replaces the value with the results of the given
1973	>	* remapping function, or removes if {@code null}. The entire
1974	>	* method invocation is performed atomically.  Some attempted
1975	>	* update operations on this map by other threads may be blocked
1976	>	* while computation is in progress, so the computation should be
1977	>	* short and simple, and must not attempt to update any other
1978	>	* mappings of this Map.
1979	>	*
1980	>	* @param key key with which the specified value is to be associated
1981	>	* @param value the value to use if absent
1982	>	* @param remappingFunction the function to recompute a value if present
1983	>	* @return the new value associated with the specified key, or null if none
1984	>	* @throws NullPointerException if the specified key or the
1985	>	*         remappingFunction is null
1986	>	* @throws RuntimeException or Error if the remappingFunction does so,
1987	>	*         in which case the mapping is unchanged
1988		*/
1989	<	@SuppressWarnings("unchecked") public V merge
2921	<	(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1989	>	public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
1990		if (key == null || value == null || remappingFunction == null)
1991		throw new NullPointerException();
1992	<	return (V)internalMerge(key, value, remappingFunction);
1992	>	int h = spread(key.hashCode());
1993	>	V val = null;
1994	>	int delta = 0;
1995	>	int binCount = 0;
1996	>	for (Node<K,V>[] tab = table;;) {
1997	>	Node<K,V> f; int n, i, fh;
1998	>	if (tab == null || (n = tab.length) == 0)
1999	>	tab = initTable();
2000	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
2001	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value))) {
2002	>	delta = 1;
2003	>	val = value;
2004	>	break;
2005	>	}
2006	>	}
2007	>	else if ((fh = f.hash) == MOVED)
2008	>	tab = helpTransfer(tab, f);
2009	>	else {
2010	>	synchronized (f) {
2011	>	if (tabAt(tab, i) == f) {
2012	>	if (fh >= 0) {
2013	>	binCount = 1;
2014	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
2015	>	K ek;
2016	>	if (e.hash == h &&
2017	>	((ek = e.key) == key ||
2018	>	(ek != null && key.equals(ek)))) {
2019	>	val = remappingFunction.apply(e.val, value);
2020	>	if (val != null)
2021	>	e.val = val;
2022	>	else {
2023	>	delta = -1;
2024	>	Node<K,V> en = e.next;
2025	>	if (pred != null)
2026	>	pred.next = en;
2027	>	else
2028	>	setTabAt(tab, i, en);
2029	>	}
2030	>	break;
2031	>	}
2032	>	pred = e;
2033	>	if ((e = e.next) == null) {
2034	>	delta = 1;
2035	>	val = value;
2036	>	pred.next = new Node<K,V>(h, key, val);
2037	>	break;
2038	>	}
2039	>	}
2040	>	}
2041	>	else if (f instanceof TreeBin) {
2042	>	binCount = 2;
2043	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2044	>	TreeNode<K,V> r = t.root;
2045	>	TreeNode<K,V> p = (r == null) ? null :
2046	>	r.findTreeNode(h, key, null);
2047	>	val = (p == null) ? value :
2048	>	remappingFunction.apply(p.val, value);
2049	>	if (val != null) {
2050	>	if (p != null)
2051	>	p.val = val;
2052	>	else {
2053	>	delta = 1;
2054	>	t.putTreeVal(h, key, val);
2055	>	}
2056	>	}
2057	>	else if (p != null) {
2058	>	delta = -1;
2059	>	if (t.removeTreeNode(p))
2060	>	setTabAt(tab, i, untreeify(t.first));
2061	>	}
2062	>	}
2063	>	else if (f instanceof ReservationNode)
2064	>	throw new IllegalStateException("Recursive update");
2065	>	}
2066	>	}
2067	>	if (binCount != 0) {
2068	>	if (binCount >= TREEIFY_THRESHOLD)
2069	>	treeifyBin(tab, i);
2070	>	break;
2071	>	}
2072	>	}
2073	>	}
2074	>	if (delta != 0)
2075	>	addCount((long)delta, binCount);
2076	>	return val;
2077		}
2078
2079	+	// Hashtable legacy methods
2080	+
2081		/**
2082	<	* Removes the key (and its corresponding value) from this map.
2929	<	* This method does nothing if the key is not in the map.
2082	>	* Tests if some key maps into the specified value in this table.
2083		*
2084	<	* @param  key the key that needs to be removed
2085	<	* @return the previous value associated with {@code key}, or
2086	<	*         {@code null} if there was no mapping for {@code key}
2087	<	* @throws NullPointerException if the specified key is null
2084	>	* <p>Note that this method is identical in functionality to
2085	>	* {@link #containsValue(Object)}, and exists solely to ensure
2086	>	* full compatibility with class {@link java.util.Hashtable},
2087	>	* which supported this method prior to introduction of the
2088	>	* Java Collections Framework.
2089	>	*
2090	>	* @param  value a value to search for
2091	>	* @return {@code true} if and only if some key maps to the
2092	>	*         {@code value} argument in this table as
2093	>	*         determined by the {@code equals} method;
2094	>	*         {@code false} otherwise
2095	>	* @throws NullPointerException if the specified value is null
2096		*/
2097	<	@SuppressWarnings("unchecked") public V remove(Object key) {
2098	<	if (key == null)
2938	<	throw new NullPointerException();
2939	<	return (V)internalReplace(key, null, null);
2097	>	public boolean contains(Object value) {
2098	>	return containsValue(value);
2099		}
2100
2101		/**
2102	<	* {@inheritDoc}
2102	>	* Returns an enumeration of the keys in this table.
2103		*
2104	<	* @throws NullPointerException if the specified key is null
2104	>	* @return an enumeration of the keys in this table
2105	>	* @see #keySet()
2106		*/
2107	<	public boolean remove(Object key, Object value) {
2108	<	if (key == null)
2109	<	throw new NullPointerException();
2110	<	if (value == null)
2951	<	return false;
2952	<	return internalReplace(key, null, value) != null;
2107	>	public Enumeration<K> keys() {
2108	>	Node<K,V>[] t;
2109	>	int f = (t = table) == null ? 0 : t.length;
2110	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2111		}
2112
2113		/**
2114	<	* {@inheritDoc}
2114	>	* Returns an enumeration of the values in this table.
2115		*
2116	<	* @throws NullPointerException if any of the arguments are null
2116	>	* @return an enumeration of the values in this table
2117	>	* @see #values()
2118		*/
2119	<	public boolean replace(K key, V oldValue, V newValue) {
2120	<	if (key == null || oldValue == null || newValue == null)
2121	<	throw new NullPointerException();
2122	<	return internalReplace(key, newValue, oldValue) != null;
2119	>	public Enumeration<V> elements() {
2120	>	Node<K,V>[] t;
2121	>	int f = (t = table) == null ? 0 : t.length;
2122	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2123		}
2124
2125	+	// ConcurrentHashMap-only methods
2126	+
2127		/**
2128	<	* {@inheritDoc}
2128	>	* Returns the number of mappings. This method should be used
2129	>	* instead of {@link #size} because a ConcurrentHashMap may
2130	>	* contain more mappings than can be represented as an int. The
2131	>	* value returned is an estimate; the actual count may differ if
2132	>	* there are concurrent insertions or removals.
2133		*
2134	<	* @return the previous value associated with the specified key,
2135	<	*         or {@code null} if there was no mapping for the key
2971	<	* @throws NullPointerException if the specified key or value is null
2134	>	* @return the number of mappings
2135	>	* @since 1.8
2136		*/
2137	<	@SuppressWarnings("unchecked") public V replace(K key, V value) {
2138	<	if (key == null || value == null)
2139	<	throw new NullPointerException();
2976	<	return (V)internalReplace(key, value, null);
2137	>	public long mappingCount() {
2138	>	long n = sumCount();
2139	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2140		}
2141
2142		/**
2143	<	* Removes all of the mappings from this map.
2143	>	* Creates a new {@link Set} backed by a ConcurrentHashMap
2144	>	* from the given type to {@code Boolean.TRUE}.
2145	>	*
2146	>	* @param <K> the element type of the returned set
2147	>	* @return the new set
2148	>	* @since 1.8
2149		*/
2150	<	public void clear() {
2151	<	internalClear();
2150	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2151	>	return new KeySetView<K,Boolean>
2152	>	(new ConcurrentHashMap<K,Boolean>(), Boolean.TRUE);
2153		}
2154
2155		/**
2156	<	* Returns a {@link Set} view of the keys contained in this map.
2157	<	* The set is backed by the map, so changes to the map are
2989	<	* reflected in the set, and vice-versa.
2156	>	* Creates a new {@link Set} backed by a ConcurrentHashMap
2157	>	* from the given type to {@code Boolean.TRUE}.
2158		*
2159	<	* @return the set view
2159	>	* @param initialCapacity The implementation performs internal
2160	>	* sizing to accommodate this many elements.
2161	>	* @param <K> the element type of the returned set
2162	>	* @return the new set
2163	>	* @throws IllegalArgumentException if the initial capacity of
2164	>	* elements is negative
2165	>	* @since 1.8
2166		*/
2167	<	public KeySetView<K,V> keySet() {
2168	<	KeySetView<K,V> ks = keySet;
2169	<	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2167	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2168	>	return new KeySetView<K,Boolean>
2169	>	(new ConcurrentHashMap<K,Boolean>(initialCapacity), Boolean.TRUE);
2170		}
2171
2172		/**
2173		* Returns a {@link Set} view of the keys in this map, using the
2174		* given common mapped value for any additions (i.e., {@link
2175	<	* Collection#add} and {@link Collection#addAll}). This is of
2176	<	* course only appropriate if it is acceptable to use the same
2177	<	* value for all additions from this view.
2175	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2176	>	* This is of course only appropriate if it is acceptable to use
2177	>	* the same value for all additions from this view.
2178		*
2179	<	* @param mappedValue the mapped value to use for any
3006	<	* additions.
2179	>	* @param mappedValue the mapped value to use for any additions
2180		* @return the set view
2181		* @throws NullPointerException if the mappedValue is null
2182		*/
#	Line 3013 | Line 2186 | public class ConcurrentHashMap<K, V>
2186		return new KeySetView<K,V>(this, mappedValue);
2187		}
2188
2189	+	/* ---------------- Special Nodes -------------- */
2190	+
2191		/**
2192	<	* Returns a {@link Collection} view of the values contained in this map.
3018	<	* The collection is backed by the map, so changes to the map are
3019	<	* reflected in the collection, and vice-versa.
2192	>	* A node inserted at head of bins during transfer operations.
2193		*/
2194	<	public ValuesView<K,V> values() {
2195	<	ValuesView<K,V> vs = values;
2196	<	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
2194	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2195	>	final Node<K,V>[] nextTable;
2196	>	ForwardingNode(Node<K,V>[] tab) {
2197	>	super(MOVED, null, null);
2198	>	this.nextTable = tab;
2199	>	}
2200	>
2201	>	Node<K,V> find(int h, Object k) {
2202	>	// loop to avoid arbitrarily deep recursion on forwarding nodes
2203	>	outer: for (Node<K,V>[] tab = nextTable;;) {
2204	>	Node<K,V> e; int n;
2205	>	if (k == null || tab == null || (n = tab.length) == 0 ||
2206	>	(e = tabAt(tab, (n - 1) & h)) == null)
2207	>	return null;
2208	>	for (;;) {
2209	>	int eh; K ek;
2210	>	if ((eh = e.hash) == h &&
2211	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2212	>	return e;
2213	>	if (eh < 0) {
2214	>	if (e instanceof ForwardingNode) {
2215	>	tab = ((ForwardingNode<K,V>)e).nextTable;
2216	>	continue outer;
2217	>	}
2218	>	else
2219	>	return e.find(h, k);
2220	>	}
2221	>	if ((e = e.next) == null)
2222	>	return null;
2223	>	}
2224	>	}
2225	>	}
2226		}
2227
2228		/**
2229	<	* Returns a {@link Set} view of the mappings contained in this map.
3028	<	* The set is backed by the map, so changes to the map are
3029	<	* reflected in the set, and vice-versa.  The set supports element
3030	<	* removal, which removes the corresponding mapping from the map,
3031	<	* via the {@code Iterator.remove}, {@code Set.remove},
3032	<	* {@code removeAll}, {@code retainAll}, and {@code clear}
3033	<	* operations.  It does not support the {@code add} or
3034	<	* {@code addAll} operations.
3035	<	*
3036	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
3037	<	* that will never throw {@link ConcurrentModificationException},
3038	<	* and guarantees to traverse elements as they existed upon
3039	<	* construction of the iterator, and may (but is not guaranteed to)
3040	<	* reflect any modifications subsequent to construction.
2229	>	* A place-holder node used in computeIfAbsent and compute.
2230		*/
2231	<	public Set<Map.Entry<K,V>> entrySet() {
2232	<	EntrySetView<K,V> es = entrySet;
2233	<	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
2231	>	static final class ReservationNode<K,V> extends Node<K,V> {
2232	>	ReservationNode() {
2233	>	super(RESERVED, null, null);
2234	>	}
2235	>
2236	>	Node<K,V> find(int h, Object k) {
2237	>	return null;
2238	>	}
2239		}
2240
2241	+	/* ---------------- Table Initialization and Resizing -------------- */
2242	+
2243		/**
2244	<	* Returns an enumeration of the keys in this table.
2245	<	*
3050	<	* @return an enumeration of the keys in this table
3051	<	* @see #keySet()
2244	>	* Returns the stamp bits for resizing a table of size n.
2245	>	* Must be negative when shifted left by RESIZE_STAMP_SHIFT.
2246		*/
2247	<	public Enumeration<K> keys() {
2248	<	return new KeyIterator<K,V>(this);
2247	>	static final int resizeStamp(int n) {
2248	>	return Integer.numberOfLeadingZeros(n) | (1 << (RESIZE_STAMP_BITS - 1));
2249		}
2250
2251		/**
2252	<	* Returns an enumeration of the values in this table.
3059	<	*
3060	<	* @return an enumeration of the values in this table
3061	<	* @see #values()
2252	>	* Initializes table, using the size recorded in sizeCtl.
2253		*/
2254	<	public Enumeration<V> elements() {
2255	<	return new ValueIterator<K,V>(this);
2254	>	private final Node<K,V>[] initTable() {
2255	>	Node<K,V>[] tab; int sc;
2256	>	while ((tab = table) == null || tab.length == 0) {
2257	>	if ((sc = sizeCtl) < 0)
2258	>	Thread.yield(); // lost initialization race; just spin
2259	>	else if (U.compareAndSetInt(this, SIZECTL, sc, -1)) {
2260	>	try {
2261	>	if ((tab = table) == null || tab.length == 0) {
2262	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2263	>	@SuppressWarnings("unchecked")
2264	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2265	>	table = tab = nt;
2266	>	sc = n - (n >>> 2);
2267	>	}
2268	>	} finally {
2269	>	sizeCtl = sc;
2270	>	}
2271	>	break;
2272	>	}
2273	>	}
2274	>	return tab;
2275		}
2276
2277		/**
2278	<	* Returns a partitionable iterator of the keys in this map.
2279	<	*
2280	<	* @return a partitionable iterator of the keys in this map
2278	>	* Adds to count, and if table is too small and not already
2279	>	* resizing, initiates transfer. If already resizing, helps
2280	>	* perform transfer if work is available.  Rechecks occupancy
2281	>	* after a transfer to see if another resize is already needed
2282	>	* because resizings are lagging additions.
2283	>	*
2284	>	* @param x the count to add
2285	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
2286	>	*/
2287	>	private final void addCount(long x, int check) {
2288	>	CounterCell[] cs; long b, s;
2289	>	if ((cs = counterCells) != null ||
2290	>	!U.compareAndSetLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2291	>	CounterCell c; long v; int m;
2292	>	boolean uncontended = true;
2293	>	if (cs == null || (m = cs.length - 1) < 0 ||
2294	>	(c = cs[ThreadLocalRandom.getProbe() & m]) == null ||
2295	>	!(uncontended =
2296	>	U.compareAndSetLong(c, CELLVALUE, v = c.value, v + x))) {
2297	>	fullAddCount(x, uncontended);
2298	>	return;
2299	>	}
2300	>	if (check <= 1)
2301	>	return;
2302	>	s = sumCount();
2303	>	}
2304	>	if (check >= 0) {
2305	>	Node<K,V>[] tab, nt; int n, sc;
2306	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2307	>	(n = tab.length) < MAXIMUM_CAPACITY) {
2308	>	int rs = resizeStamp(n) << RESIZE_STAMP_SHIFT;
2309	>	if (sc < 0) {
2310	>	if (sc == rs + MAX_RESIZERS || sc == rs + 1 ||
2311	>	(nt = nextTable) == null || transferIndex <= 0)
2312	>	break;
2313	>	if (U.compareAndSetInt(this, SIZECTL, sc, sc + 1))
2314	>	transfer(tab, nt);
2315	>	}
2316	>	else if (U.compareAndSetInt(this, SIZECTL, sc, rs + 2))
2317	>	transfer(tab, null);
2318	>	s = sumCount();
2319	>	}
2320	>	}
2321	>	}
2322	>
2323	>	/**
2324	>	* Helps transfer if a resize is in progress.
2325		*/
2326	<	public Spliterator<K> keySpliterator() {
2327	<	return new KeyIterator<K,V>(this);
2326	>	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2327	>	Node<K,V>[] nextTab; int sc;
2328	>	if (tab != null && (f instanceof ForwardingNode) &&
2329	>	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2330	>	int rs = resizeStamp(tab.length) << RESIZE_STAMP_SHIFT;
2331	>	while (nextTab == nextTable && table == tab &&
2332	>	(sc = sizeCtl) < 0) {
2333	>	if (sc == rs + MAX_RESIZERS || sc == rs + 1 ||
2334	>	transferIndex <= 0)
2335	>	break;
2336	>	if (U.compareAndSetInt(this, SIZECTL, sc, sc + 1)) {
2337	>	transfer(tab, nextTab);
2338	>	break;
2339	>	}
2340	>	}
2341	>	return nextTab;
2342	>	}
2343	>	return table;
2344		}
2345
2346		/**
2347	<	* Returns a partitionable iterator of the values in this map.
2347	>	* Tries to presize table to accommodate the given number of elements.
2348		*
2349	<	* @return a partitionable iterator of the values in this map
2349	>	* @param size number of elements (doesn't need to be perfectly accurate)
2350		*/
2351	<	public Spliterator<V> valueSpliterator() {
2352	<	return new ValueIterator<K,V>(this);
2351	>	private final void tryPresize(int size) {
2352	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2353	>	tableSizeFor(size + (size >>> 1) + 1);
2354	>	int sc;
2355	>	while ((sc = sizeCtl) >= 0) {
2356	>	Node<K,V>[] tab = table; int n;
2357	>	if (tab == null || (n = tab.length) == 0) {
2358	>	n = (sc > c) ? sc : c;
2359	>	if (U.compareAndSetInt(this, SIZECTL, sc, -1)) {
2360	>	try {
2361	>	if (table == tab) {
2362	>	@SuppressWarnings("unchecked")
2363	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2364	>	table = nt;
2365	>	sc = n - (n >>> 2);
2366	>	}
2367	>	} finally {
2368	>	sizeCtl = sc;
2369	>	}
2370	>	}
2371	>	}
2372	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2373	>	break;
2374	>	else if (tab == table) {
2375	>	int rs = resizeStamp(n);
2376	>	if (U.compareAndSetInt(this, SIZECTL, sc,
2377	>	(rs << RESIZE_STAMP_SHIFT) + 2))
2378	>	transfer(tab, null);
2379	>	}
2380	>	}
2381		}
2382
2383		/**
2384	<	* Returns a partitionable iterator of the entries in this map.
2385	<	*
3088	<	* @return a partitionable iterator of the entries in this map
2384	>	* Moves and/or copies the nodes in each bin to new table. See
2385	>	* above for explanation.
2386		*/
2387	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2388	<	return new EntryIterator<K,V>(this);
2387	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2388	>	int n = tab.length, stride;
2389	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2390	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
2391	>	if (nextTab == null) {            // initiating
2392	>	try {
2393	>	@SuppressWarnings("unchecked")
2394	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n << 1];
2395	>	nextTab = nt;
2396	>	} catch (Throwable ex) {      // try to cope with OOME
2397	>	sizeCtl = Integer.MAX_VALUE;
2398	>	return;
2399	>	}
2400	>	nextTable = nextTab;
2401	>	transferIndex = n;
2402	>	}
2403	>	int nextn = nextTab.length;
2404	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2405	>	boolean advance = true;
2406	>	boolean finishing = false; // to ensure sweep before committing nextTab
2407	>	for (int i = 0, bound = 0;;) {
2408	>	Node<K,V> f; int fh;
2409	>	while (advance) {
2410	>	int nextIndex, nextBound;
2411	>	if (--i >= bound || finishing)
2412	>	advance = false;
2413	>	else if ((nextIndex = transferIndex) <= 0) {
2414	>	i = -1;
2415	>	advance = false;
2416	>	}
2417	>	else if (U.compareAndSetInt
2418	>	(this, TRANSFERINDEX, nextIndex,
2419	>	nextBound = (nextIndex > stride ?
2420	>	nextIndex - stride : 0))) {
2421	>	bound = nextBound;
2422	>	i = nextIndex - 1;
2423	>	advance = false;
2424	>	}
2425	>	}
2426	>	if (i < 0 || i >= n || i + n >= nextn) {
2427	>	int sc;
2428	>	if (finishing) {
2429	>	nextTable = null;
2430	>	table = nextTab;
2431	>	sizeCtl = (n << 1) - (n >>> 1);
2432	>	return;
2433	>	}
2434	>	if (U.compareAndSetInt(this, SIZECTL, sc = sizeCtl, sc - 1)) {
2435	>	if ((sc - 2) != resizeStamp(n) << RESIZE_STAMP_SHIFT)
2436	>	return;
2437	>	finishing = advance = true;
2438	>	i = n; // recheck before commit
2439	>	}
2440	>	}
2441	>	else if ((f = tabAt(tab, i)) == null)
2442	>	advance = casTabAt(tab, i, null, fwd);
2443	>	else if ((fh = f.hash) == MOVED)
2444	>	advance = true; // already processed
2445	>	else {
2446	>	synchronized (f) {
2447	>	if (tabAt(tab, i) == f) {
2448	>	Node<K,V> ln, hn;
2449	>	if (fh >= 0) {
2450	>	int runBit = fh & n;
2451	>	Node<K,V> lastRun = f;
2452	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2453	>	int b = p.hash & n;
2454	>	if (b != runBit) {
2455	>	runBit = b;
2456	>	lastRun = p;
2457	>	}
2458	>	}
2459	>	if (runBit == 0) {
2460	>	ln = lastRun;
2461	>	hn = null;
2462	>	}
2463	>	else {
2464	>	hn = lastRun;
2465	>	ln = null;
2466	>	}
2467	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2468	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2469	>	if ((ph & n) == 0)
2470	>	ln = new Node<K,V>(ph, pk, pv, ln);
2471	>	else
2472	>	hn = new Node<K,V>(ph, pk, pv, hn);
2473	>	}
2474	>	setTabAt(nextTab, i, ln);
2475	>	setTabAt(nextTab, i + n, hn);
2476	>	setTabAt(tab, i, fwd);
2477	>	advance = true;
2478	>	}
2479	>	else if (f instanceof TreeBin) {
2480	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2481	>	TreeNode<K,V> lo = null, loTail = null;
2482	>	TreeNode<K,V> hi = null, hiTail = null;
2483	>	int lc = 0, hc = 0;
2484	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2485	>	int h = e.hash;
2486	>	TreeNode<K,V> p = new TreeNode<K,V>
2487	>	(h, e.key, e.val, null, null);
2488	>	if ((h & n) == 0) {
2489	>	if ((p.prev = loTail) == null)
2490	>	lo = p;
2491	>	else
2492	>	loTail.next = p;
2493	>	loTail = p;
2494	>	++lc;
2495	>	}
2496	>	else {
2497	>	if ((p.prev = hiTail) == null)
2498	>	hi = p;
2499	>	else
2500	>	hiTail.next = p;
2501	>	hiTail = p;
2502	>	++hc;
2503	>	}
2504	>	}
2505	>	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2506	>	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2507	>	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2508	>	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2509	>	setTabAt(nextTab, i, ln);
2510	>	setTabAt(nextTab, i + n, hn);
2511	>	setTabAt(tab, i, fwd);
2512	>	advance = true;
2513	>	}
2514	>	else if (f instanceof ReservationNode)
2515	>	throw new IllegalStateException("Recursive update");
2516	>	}
2517	>	}
2518	>	}
2519	>	}
2520		}
2521
2522	+	/* ---------------- Counter support -------------- */
2523	+
2524		/**
2525	<	* Returns the hash code value for this {@link Map}, i.e.,
2526	<	* the sum of, for each key-value pair in the map,
3097	<	* {@code key.hashCode() ^ value.hashCode()}.
3098	<	*
3099	<	* @return the hash code value for this map
2525	>	* A padded cell for distributing counts.  Adapted from LongAdder
2526	>	* and Striped64.  See their internal docs for explanation.
2527		*/
2528	<	public int hashCode() {
2529	<	int h = 0;
2530	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2531	<	Object v;
2532	<	while ((v = it.advance()) != null) {
2533	<	h += it.nextKey.hashCode() ^ v.hashCode();
2528	>	@jdk.internal.vm.annotation.Contended static final class CounterCell {
2529	>	volatile long value;
2530	>	CounterCell(long x) { value = x; }
2531	>	}
2532	>
2533	>	final long sumCount() {
2534	>	CounterCell[] cs = counterCells;
2535	>	long sum = baseCount;
2536	>	if (cs != null) {
2537	>	for (CounterCell c : cs)
2538	>	if (c != null)
2539	>	sum += c.value;
2540	>	}
2541	>	return sum;
2542	>	}
2543	>
2544	>	// See LongAdder version for explanation
2545	>	private final void fullAddCount(long x, boolean wasUncontended) {
2546	>	int h;
2547	>	if ((h = ThreadLocalRandom.getProbe()) == 0) {
2548	>	ThreadLocalRandom.localInit();      // force initialization
2549	>	h = ThreadLocalRandom.getProbe();
2550	>	wasUncontended = true;
2551	>	}
2552	>	boolean collide = false;                // True if last slot nonempty
2553	>	for (;;) {
2554	>	CounterCell[] cs; CounterCell c; int n; long v;
2555	>	if ((cs = counterCells) != null && (n = cs.length) > 0) {
2556	>	if ((c = cs[(n - 1) & h]) == null) {
2557	>	if (cellsBusy == 0) {            // Try to attach new Cell
2558	>	CounterCell r = new CounterCell(x); // Optimistic create
2559	>	if (cellsBusy == 0 &&
2560	>	U.compareAndSetInt(this, CELLSBUSY, 0, 1)) {
2561	>	boolean created = false;
2562	>	try {               // Recheck under lock
2563	>	CounterCell[] rs; int m, j;
2564	>	if ((rs = counterCells) != null &&
2565	>	(m = rs.length) > 0 &&
2566	>	rs[j = (m - 1) & h] == null) {
2567	>	rs[j] = r;
2568	>	created = true;
2569	>	}
2570	>	} finally {
2571	>	cellsBusy = 0;
2572	>	}
2573	>	if (created)
2574	>	break;
2575	>	continue;           // Slot is now non-empty
2576	>	}
2577	>	}
2578	>	collide = false;
2579	>	}
2580	>	else if (!wasUncontended)       // CAS already known to fail
2581	>	wasUncontended = true;      // Continue after rehash
2582	>	else if (U.compareAndSetLong(c, CELLVALUE, v = c.value, v + x))
2583	>	break;
2584	>	else if (counterCells != cs || n >= NCPU)
2585	>	collide = false;            // At max size or stale
2586	>	else if (!collide)
2587	>	collide = true;
2588	>	else if (cellsBusy == 0 &&
2589	>	U.compareAndSetInt(this, CELLSBUSY, 0, 1)) {
2590	>	try {
2591	>	if (counterCells == cs) // Expand table unless stale
2592	>	counterCells = Arrays.copyOf(cs, n << 1);
2593	>	} finally {
2594	>	cellsBusy = 0;
2595	>	}
2596	>	collide = false;
2597	>	continue;                   // Retry with expanded table
2598	>	}
2599	>	h = ThreadLocalRandom.advanceProbe(h);
2600	>	}
2601	>	else if (cellsBusy == 0 && counterCells == cs &&
2602	>	U.compareAndSetInt(this, CELLSBUSY, 0, 1)) {
2603	>	boolean init = false;
2604	>	try {                           // Initialize table
2605	>	if (counterCells == cs) {
2606	>	CounterCell[] rs = new CounterCell[2];
2607	>	rs[h & 1] = new CounterCell(x);
2608	>	counterCells = rs;
2609	>	init = true;
2610	>	}
2611	>	} finally {
2612	>	cellsBusy = 0;
2613	>	}
2614	>	if (init)
2615	>	break;
2616	>	}
2617	>	else if (U.compareAndSetLong(this, BASECOUNT, v = baseCount, v + x))
2618	>	break;                          // Fall back on using base
2619		}
3108	–	return h;
2620		}
2621
2622	+	/* ---------------- Conversion from/to TreeBins -------------- */
2623	+
2624		/**
2625	<	* Returns a string representation of this map.  The string
2626	<	* representation consists of a list of key-value mappings (in no
2627	<	* particular order) enclosed in braces ("{@code {}}").  Adjacent
2628	<	* mappings are separated by the characters {@code ", "} (comma
2629	<	* and space).  Each key-value mapping is rendered as the key
2630	<	* followed by an equals sign ("{@code =}") followed by the
2631	<	* associated value.
2632	<	*
2633	<	* @return a string representation of this map
2625	>	* Replaces all linked nodes in bin at given index unless table is
2626	>	* too small, in which case resizes instead.
2627	>	*/
2628	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2629	>	Node<K,V> b; int n;
2630	>	if (tab != null) {
2631	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY)
2632	>	tryPresize(n << 1);
2633	>	else if ((b = tabAt(tab, index)) != null && b.hash >= 0) {
2634	>	synchronized (b) {
2635	>	if (tabAt(tab, index) == b) {
2636	>	TreeNode<K,V> hd = null, tl = null;
2637	>	for (Node<K,V> e = b; e != null; e = e.next) {
2638	>	TreeNode<K,V> p =
2639	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2640	>	null, null);
2641	>	if ((p.prev = tl) == null)
2642	>	hd = p;
2643	>	else
2644	>	tl.next = p;
2645	>	tl = p;
2646	>	}
2647	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2648	>	}
2649	>	}
2650	>	}
2651	>	}
2652	>	}
2653	>
2654	>	/**
2655	>	* Returns a list of non-TreeNodes replacing those in given list.
2656		*/
2657	<	public String toString() {
2658	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2659	<	StringBuilder sb = new StringBuilder();
2660	<	sb.append('{');
2661	<	Object v;
2662	<	if ((v = it.advance()) != null) {
2663	<	for (;;) {
2664	<	Object k = it.nextKey;
2665	<	sb.append(k == this ? "(this Map)" : k);
2666	<	sb.append('=');
2667	<	sb.append(v == this ? "(this Map)" : v);
2668	<	if ((v = it.advance()) == null)
2657	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2658	>	Node<K,V> hd = null, tl = null;
2659	>	for (Node<K,V> q = b; q != null; q = q.next) {
2660	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val);
2661	>	if (tl == null)
2662	>	hd = p;
2663	>	else
2664	>	tl.next = p;
2665	>	tl = p;
2666	>	}
2667	>	return hd;
2668	>	}
2669	>
2670	>	/* ---------------- TreeNodes -------------- */
2671	>
2672	>	/**
2673	>	* Nodes for use in TreeBins.
2674	>	*/
2675	>	static final class TreeNode<K,V> extends Node<K,V> {
2676	>	TreeNode<K,V> parent;  // red-black tree links
2677	>	TreeNode<K,V> left;
2678	>	TreeNode<K,V> right;
2679	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2680	>	boolean red;
2681	>
2682	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2683	>	TreeNode<K,V> parent) {
2684	>	super(hash, key, val, next);
2685	>	this.parent = parent;
2686	>	}
2687	>
2688	>	Node<K,V> find(int h, Object k) {
2689	>	return findTreeNode(h, k, null);
2690	>	}
2691	>
2692	>	/**
2693	>	* Returns the TreeNode (or null if not found) for the given key
2694	>	* starting at given root.
2695	>	*/
2696	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2697	>	if (k != null) {
2698	>	TreeNode<K,V> p = this;
2699	>	do {
2700	>	int ph, dir; K pk; TreeNode<K,V> q;
2701	>	TreeNode<K,V> pl = p.left, pr = p.right;
2702	>	if ((ph = p.hash) > h)
2703	>	p = pl;
2704	>	else if (ph < h)
2705	>	p = pr;
2706	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2707	>	return p;
2708	>	else if (pl == null)
2709	>	p = pr;
2710	>	else if (pr == null)
2711	>	p = pl;
2712	>	else if ((kc != null ||
2713	>	(kc = comparableClassFor(k)) != null) &&
2714	>	(dir = compareComparables(kc, k, pk)) != 0)
2715	>	p = (dir < 0) ? pl : pr;
2716	>	else if ((q = pr.findTreeNode(h, k, kc)) != null)
2717	>	return q;
2718	>	else
2719	>	p = pl;
2720	>	} while (p != null);
2721	>	}
2722	>	return null;
2723	>	}
2724	>	}
2725	>
2726	>	/* ---------------- TreeBins -------------- */
2727	>
2728	>	/**
2729	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2730	>	* keys or values, but instead point to list of TreeNodes and
2731	>	* their root. They also maintain a parasitic read-write lock
2732	>	* forcing writers (who hold bin lock) to wait for readers (who do
2733	>	* not) to complete before tree restructuring operations.
2734	>	*/
2735	>	static final class TreeBin<K,V> extends Node<K,V> {
2736	>	TreeNode<K,V> root;
2737	>	volatile TreeNode<K,V> first;
2738	>	volatile Thread waiter;
2739	>	volatile int lockState;
2740	>	// values for lockState
2741	>	static final int WRITER = 1; // set while holding write lock
2742	>	static final int WAITER = 2; // set when waiting for write lock
2743	>	static final int READER = 4; // increment value for setting read lock
2744	>
2745	>	/**
2746	>	* Tie-breaking utility for ordering insertions when equal
2747	>	* hashCodes and non-comparable. We don't require a total
2748	>	* order, just a consistent insertion rule to maintain
2749	>	* equivalence across rebalancings. Tie-breaking further than
2750	>	* necessary simplifies testing a bit.
2751	>	*/
2752	>	static int tieBreakOrder(Object a, Object b) {
2753	>	int d;
2754	>	if (a == null || b == null ||
2755	>	(d = a.getClass().getName().
2756	>	compareTo(b.getClass().getName())) == 0)
2757	>	d = (System.identityHashCode(a) <= System.identityHashCode(b) ?
2758	>	-1 : 1);
2759	>	return d;
2760	>	}
2761	>
2762	>	/**
2763	>	* Creates bin with initial set of nodes headed by b.
2764	>	*/
2765	>	TreeBin(TreeNode<K,V> b) {
2766	>	super(TREEBIN, null, null);
2767	>	this.first = b;
2768	>	TreeNode<K,V> r = null;
2769	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2770	>	next = (TreeNode<K,V>)x.next;
2771	>	x.left = x.right = null;
2772	>	if (r == null) {
2773	>	x.parent = null;
2774	>	x.red = false;
2775	>	r = x;
2776	>	}
2777	>	else {
2778	>	K k = x.key;
2779	>	int h = x.hash;
2780	>	Class<?> kc = null;
2781	>	for (TreeNode<K,V> p = r;;) {
2782	>	int dir, ph;
2783	>	K pk = p.key;
2784	>	if ((ph = p.hash) > h)
2785	>	dir = -1;
2786	>	else if (ph < h)
2787	>	dir = 1;
2788	>	else if ((kc == null &&
2789	>	(kc = comparableClassFor(k)) == null) ||
2790	>	(dir = compareComparables(kc, k, pk)) == 0)
2791	>	dir = tieBreakOrder(k, pk);
2792	>	TreeNode<K,V> xp = p;
2793	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2794	>	x.parent = xp;
2795	>	if (dir <= 0)
2796	>	xp.left = x;
2797	>	else
2798	>	xp.right = x;
2799	>	r = balanceInsertion(r, x);
2800	>	break;
2801	>	}
2802	>	}
2803	>	}
2804	>	}
2805	>	this.root = r;
2806	>	assert checkInvariants(root);
2807	>	}
2808	>
2809	>	/**
2810	>	* Acquires write lock for tree restructuring.
2811	>	*/
2812	>	private final void lockRoot() {
2813	>	if (!U.compareAndSetInt(this, LOCKSTATE, 0, WRITER))
2814	>	contendedLock(); // offload to separate method
2815	>	}
2816	>
2817	>	/**
2818	>	* Releases write lock for tree restructuring.
2819	>	*/
2820	>	private final void unlockRoot() {
2821	>	lockState = 0;
2822	>	}
2823	>
2824	>	/**
2825	>	* Possibly blocks awaiting root lock.
2826	>	*/
2827	>	private final void contendedLock() {
2828	>	boolean waiting = false;
2829	>	for (int s;;) {
2830	>	if (((s = lockState) & ~WAITER) == 0) {
2831	>	if (U.compareAndSetInt(this, LOCKSTATE, s, WRITER)) {
2832	>	if (waiting)
2833	>	waiter = null;
2834	>	return;
2835	>	}
2836	>	}
2837	>	else if ((s & WAITER) == 0) {
2838	>	if (U.compareAndSetInt(this, LOCKSTATE, s, s | WAITER)) {
2839	>	waiting = true;
2840	>	waiter = Thread.currentThread();
2841	>	}
2842	>	}
2843	>	else if (waiting)
2844	>	LockSupport.park(this);
2845	>	}
2846	>	}
2847	>
2848	>	/**
2849	>	* Returns matching node or null if none. Tries to search
2850	>	* using tree comparisons from root, but continues linear
2851	>	* search when lock not available.
2852	>	*/
2853	>	final Node<K,V> find(int h, Object k) {
2854	>	if (k != null) {
2855	>	for (Node<K,V> e = first; e != null; ) {
2856	>	int s; K ek;
2857	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2858	>	if (e.hash == h &&
2859	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2860	>	return e;
2861	>	e = e.next;
2862	>	}
2863	>	else if (U.compareAndSetInt(this, LOCKSTATE, s,
2864	>	s + READER)) {
2865	>	TreeNode<K,V> r, p;
2866	>	try {
2867	>	p = ((r = root) == null ? null :
2868	>	r.findTreeNode(h, k, null));
2869	>	} finally {
2870	>	Thread w;
2871	>	if (U.getAndAddInt(this, LOCKSTATE, -READER) ==
2872	>	(READER|WAITER) && (w = waiter) != null)
2873	>	LockSupport.unpark(w);
2874	>	}
2875	>	return p;
2876	>	}
2877	>	}
2878	>	}
2879	>	return null;
2880	>	}
2881	>
2882	>	/**
2883	>	* Finds or adds a node.
2884	>	* @return null if added
2885	>	*/
2886	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2887	>	Class<?> kc = null;
2888	>	boolean searched = false;
2889	>	for (TreeNode<K,V> p = root;;) {
2890	>	int dir, ph; K pk;
2891	>	if (p == null) {
2892	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2893		break;
2894	<	sb.append(',').append(' ');
2894	>	}
2895	>	else if ((ph = p.hash) > h)
2896	>	dir = -1;
2897	>	else if (ph < h)
2898	>	dir = 1;
2899	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2900	>	return p;
2901	>	else if ((kc == null &&
2902	>	(kc = comparableClassFor(k)) == null) ||
2903	>	(dir = compareComparables(kc, k, pk)) == 0) {
2904	>	if (!searched) {
2905	>	TreeNode<K,V> q, ch;
2906	>	searched = true;
2907	>	if (((ch = p.left) != null &&
2908	>	(q = ch.findTreeNode(h, k, kc)) != null) ||
2909	>	((ch = p.right) != null &&
2910	>	(q = ch.findTreeNode(h, k, kc)) != null))
2911	>	return q;
2912	>	}
2913	>	dir = tieBreakOrder(k, pk);
2914	>	}
2915	>
2916	>	TreeNode<K,V> xp = p;
2917	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2918	>	TreeNode<K,V> x, f = first;
2919	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2920	>	if (f != null)
2921	>	f.prev = x;
2922	>	if (dir <= 0)
2923	>	xp.left = x;
2924	>	else
2925	>	xp.right = x;
2926	>	if (!xp.red)
2927	>	x.red = true;
2928	>	else {
2929	>	lockRoot();
2930	>	try {
2931	>	root = balanceInsertion(root, x);
2932	>	} finally {
2933	>	unlockRoot();
2934	>	}
2935	>	}
2936	>	break;
2937	>	}
2938		}
2939	+	assert checkInvariants(root);
2940	+	return null;
2941		}
2942	<	return sb.append('}').toString();
2942	>
2943	>	/**
2944	>	* Removes the given node, that must be present before this
2945	>	* call.  This is messier than typical red-black deletion code
2946	>	* because we cannot swap the contents of an interior node
2947	>	* with a leaf successor that is pinned by "next" pointers
2948	>	* that are accessible independently of lock. So instead we
2949	>	* swap the tree linkages.
2950	>	*
2951	>	* @return true if now too small, so should be untreeified
2952	>	*/
2953	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2954	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2955	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2956	>	TreeNode<K,V> r, rl;
2957	>	if (pred == null)
2958	>	first = next;
2959	>	else
2960	>	pred.next = next;
2961	>	if (next != null)
2962	>	next.prev = pred;
2963	>	if (first == null) {
2964	>	root = null;
2965	>	return true;
2966	>	}
2967	>	if ((r = root) == null || r.right == null || // too small
2968	>	(rl = r.left) == null || rl.left == null)
2969	>	return true;
2970	>	lockRoot();
2971	>	try {
2972	>	TreeNode<K,V> replacement;
2973	>	TreeNode<K,V> pl = p.left;
2974	>	TreeNode<K,V> pr = p.right;
2975	>	if (pl != null && pr != null) {
2976	>	TreeNode<K,V> s = pr, sl;
2977	>	while ((sl = s.left) != null) // find successor
2978	>	s = sl;
2979	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2980	>	TreeNode<K,V> sr = s.right;
2981	>	TreeNode<K,V> pp = p.parent;
2982	>	if (s == pr) { // p was s's direct parent
2983	>	p.parent = s;
2984	>	s.right = p;
2985	>	}
2986	>	else {
2987	>	TreeNode<K,V> sp = s.parent;
2988	>	if ((p.parent = sp) != null) {
2989	>	if (s == sp.left)
2990	>	sp.left = p;
2991	>	else
2992	>	sp.right = p;
2993	>	}
2994	>	if ((s.right = pr) != null)
2995	>	pr.parent = s;
2996	>	}
2997	>	p.left = null;
2998	>	if ((p.right = sr) != null)
2999	>	sr.parent = p;
3000	>	if ((s.left = pl) != null)
3001	>	pl.parent = s;
3002	>	if ((s.parent = pp) == null)
3003	>	r = s;
3004	>	else if (p == pp.left)
3005	>	pp.left = s;
3006	>	else
3007	>	pp.right = s;
3008	>	if (sr != null)
3009	>	replacement = sr;
3010	>	else
3011	>	replacement = p;
3012	>	}
3013	>	else if (pl != null)
3014	>	replacement = pl;
3015	>	else if (pr != null)
3016	>	replacement = pr;
3017	>	else
3018	>	replacement = p;
3019	>	if (replacement != p) {
3020	>	TreeNode<K,V> pp = replacement.parent = p.parent;
3021	>	if (pp == null)
3022	>	r = replacement;
3023	>	else if (p == pp.left)
3024	>	pp.left = replacement;
3025	>	else
3026	>	pp.right = replacement;
3027	>	p.left = p.right = p.parent = null;
3028	>	}
3029	>
3030	>	root = (p.red) ? r : balanceDeletion(r, replacement);
3031	>
3032	>	if (p == replacement) {  // detach pointers
3033	>	TreeNode<K,V> pp;
3034	>	if ((pp = p.parent) != null) {
3035	>	if (p == pp.left)
3036	>	pp.left = null;
3037	>	else if (p == pp.right)
3038	>	pp.right = null;
3039	>	p.parent = null;
3040	>	}
3041	>	}
3042	>	} finally {
3043	>	unlockRoot();
3044	>	}
3045	>	assert checkInvariants(root);
3046	>	return false;
3047	>	}
3048	>
3049	>	/* ------------------------------------------------------------ */
3050	>	// Red-black tree methods, all adapted from CLR
3051	>
3052	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
3053	>	TreeNode<K,V> p) {
3054	>	TreeNode<K,V> r, pp, rl;
3055	>	if (p != null && (r = p.right) != null) {
3056	>	if ((rl = p.right = r.left) != null)
3057	>	rl.parent = p;
3058	>	if ((pp = r.parent = p.parent) == null)
3059	>	(root = r).red = false;
3060	>	else if (pp.left == p)
3061	>	pp.left = r;
3062	>	else
3063	>	pp.right = r;
3064	>	r.left = p;
3065	>	p.parent = r;
3066	>	}
3067	>	return root;
3068	>	}
3069	>
3070	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
3071	>	TreeNode<K,V> p) {
3072	>	TreeNode<K,V> l, pp, lr;
3073	>	if (p != null && (l = p.left) != null) {
3074	>	if ((lr = p.left = l.right) != null)
3075	>	lr.parent = p;
3076	>	if ((pp = l.parent = p.parent) == null)
3077	>	(root = l).red = false;
3078	>	else if (pp.right == p)
3079	>	pp.right = l;
3080	>	else
3081	>	pp.left = l;
3082	>	l.right = p;
3083	>	p.parent = l;
3084	>	}
3085	>	return root;
3086	>	}
3087	>
3088	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
3089	>	TreeNode<K,V> x) {
3090	>	x.red = true;
3091	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
3092	>	if ((xp = x.parent) == null) {
3093	>	x.red = false;
3094	>	return x;
3095	>	}
3096	>	else if (!xp.red || (xpp = xp.parent) == null)
3097	>	return root;
3098	>	if (xp == (xppl = xpp.left)) {
3099	>	if ((xppr = xpp.right) != null && xppr.red) {
3100	>	xppr.red = false;
3101	>	xp.red = false;
3102	>	xpp.red = true;
3103	>	x = xpp;
3104	>	}
3105	>	else {
3106	>	if (x == xp.right) {
3107	>	root = rotateLeft(root, x = xp);
3108	>	xpp = (xp = x.parent) == null ? null : xp.parent;
3109	>	}
3110	>	if (xp != null) {
3111	>	xp.red = false;
3112	>	if (xpp != null) {
3113	>	xpp.red = true;
3114	>	root = rotateRight(root, xpp);
3115	>	}
3116	>	}
3117	>	}
3118	>	}
3119	>	else {
3120	>	if (xppl != null && xppl.red) {
3121	>	xppl.red = false;
3122	>	xp.red = false;
3123	>	xpp.red = true;
3124	>	x = xpp;
3125	>	}
3126	>	else {
3127	>	if (x == xp.left) {
3128	>	root = rotateRight(root, x = xp);
3129	>	xpp = (xp = x.parent) == null ? null : xp.parent;
3130	>	}
3131	>	if (xp != null) {
3132	>	xp.red = false;
3133	>	if (xpp != null) {
3134	>	xpp.red = true;
3135	>	root = rotateLeft(root, xpp);
3136	>	}
3137	>	}
3138	>	}
3139	>	}
3140	>	}
3141	>	}
3142	>
3143	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
3144	>	TreeNode<K,V> x) {
3145	>	for (TreeNode<K,V> xp, xpl, xpr;;) {
3146	>	if (x == null || x == root)
3147	>	return root;
3148	>	else if ((xp = x.parent) == null) {
3149	>	x.red = false;
3150	>	return x;
3151	>	}
3152	>	else if (x.red) {
3153	>	x.red = false;
3154	>	return root;
3155	>	}
3156	>	else if ((xpl = xp.left) == x) {
3157	>	if ((xpr = xp.right) != null && xpr.red) {
3158	>	xpr.red = false;
3159	>	xp.red = true;
3160	>	root = rotateLeft(root, xp);
3161	>	xpr = (xp = x.parent) == null ? null : xp.right;
3162	>	}
3163	>	if (xpr == null)
3164	>	x = xp;
3165	>	else {
3166	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
3167	>	if ((sr == null || !sr.red) &&
3168	>	(sl == null || !sl.red)) {
3169	>	xpr.red = true;
3170	>	x = xp;
3171	>	}
3172	>	else {
3173	>	if (sr == null || !sr.red) {
3174	>	if (sl != null)
3175	>	sl.red = false;
3176	>	xpr.red = true;
3177	>	root = rotateRight(root, xpr);
3178	>	xpr = (xp = x.parent) == null ?
3179	>	null : xp.right;
3180	>	}
3181	>	if (xpr != null) {
3182	>	xpr.red = (xp == null) ? false : xp.red;
3183	>	if ((sr = xpr.right) != null)
3184	>	sr.red = false;
3185	>	}
3186	>	if (xp != null) {
3187	>	xp.red = false;
3188	>	root = rotateLeft(root, xp);
3189	>	}
3190	>	x = root;
3191	>	}
3192	>	}
3193	>	}
3194	>	else { // symmetric
3195	>	if (xpl != null && xpl.red) {
3196	>	xpl.red = false;
3197	>	xp.red = true;
3198	>	root = rotateRight(root, xp);
3199	>	xpl = (xp = x.parent) == null ? null : xp.left;
3200	>	}
3201	>	if (xpl == null)
3202	>	x = xp;
3203	>	else {
3204	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3205	>	if ((sl == null || !sl.red) &&
3206	>	(sr == null || !sr.red)) {
3207	>	xpl.red = true;
3208	>	x = xp;
3209	>	}
3210	>	else {
3211	>	if (sl == null || !sl.red) {
3212	>	if (sr != null)
3213	>	sr.red = false;
3214	>	xpl.red = true;
3215	>	root = rotateLeft(root, xpl);
3216	>	xpl = (xp = x.parent) == null ?
3217	>	null : xp.left;
3218	>	}
3219	>	if (xpl != null) {
3220	>	xpl.red = (xp == null) ? false : xp.red;
3221	>	if ((sl = xpl.left) != null)
3222	>	sl.red = false;
3223	>	}
3224	>	if (xp != null) {
3225	>	xp.red = false;
3226	>	root = rotateRight(root, xp);
3227	>	}
3228	>	x = root;
3229	>	}
3230	>	}
3231	>	}
3232	>	}
3233	>	}
3234	>
3235	>	/**
3236	>	* Checks invariants recursively for the tree of Nodes rooted at t.
3237	>	*/
3238	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3239	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3240	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3241	>	if (tb != null && tb.next != t)
3242	>	return false;
3243	>	if (tn != null && tn.prev != t)
3244	>	return false;
3245	>	if (tp != null && t != tp.left && t != tp.right)
3246	>	return false;
3247	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3248	>	return false;
3249	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3250	>	return false;
3251	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3252	>	return false;
3253	>	if (tl != null && !checkInvariants(tl))
3254	>	return false;
3255	>	if (tr != null && !checkInvariants(tr))
3256	>	return false;
3257	>	return true;
3258	>	}
3259	>
3260	>	private static final Unsafe U = Unsafe.getUnsafe();
3261	>	private static final long LOCKSTATE
3262	>	= U.objectFieldOffset(TreeBin.class, "lockState");
3263		}
3264
3265	+	/* ----------------Table Traversal -------------- */
3266	+
3267		/**
3268	<	* Compares the specified object with this map for equality.
3269	<	* Returns {@code true} if the given object is a map with the same
3270	<	* mappings as this map.  This operation may return misleading
3271	<	* results if either map is concurrently modified during execution
3272	<	* of this method.
3268	>	* Records the table, its length, and current traversal index for a
3269	>	* traverser that must process a region of a forwarded table before
3270	>	* proceeding with current table.
3271	>	*/
3272	>	static final class TableStack<K,V> {
3273	>	int length;
3274	>	int index;
3275	>	Node<K,V>[] tab;
3276	>	TableStack<K,V> next;
3277	>	}
3278	>
3279	>	/**
3280	>	* Encapsulates traversal for methods such as containsValue; also
3281	>	* serves as a base class for other iterators and spliterators.
3282		*
3283	<	* @param o object to be compared for equality with this map
3284	<	* @return {@code true} if the specified object is equal to this map
3283	>	* Method advance visits once each still-valid node that was
3284	>	* reachable upon iterator construction. It might miss some that
3285	>	* were added to a bin after the bin was visited, which is OK wrt
3286	>	* consistency guarantees. Maintaining this property in the face
3287	>	* of possible ongoing resizes requires a fair amount of
3288	>	* bookkeeping state that is difficult to optimize away amidst
3289	>	* volatile accesses.  Even so, traversal maintains reasonable
3290	>	* throughput.
3291	>	*
3292	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3293	>	* However, if the table has been resized, then all future steps
3294	>	* must traverse both the bin at the current index as well as at
3295	>	* (index + baseSize); and so on for further resizings. To
3296	>	* paranoically cope with potential sharing by users of iterators
3297	>	* across threads, iteration terminates if a bounds checks fails
3298	>	* for a table read.
3299		*/
3300	<	public boolean equals(Object o) {
3301	<	if (o != this) {
3302	<	if (!(o instanceof Map))
3303	<	return false;
3304	<	Map<?,?> m = (Map<?,?>) o;
3305	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3306	<	Object val;
3307	<	while ((val = it.advance()) != null) {
3308	<	Object v = m.get(it.nextKey);
3309	<	if (v == null || (v != val && !v.equals(val)))
3310	<	return false;
3300	>	static class Traverser<K,V> {
3301	>	Node<K,V>[] tab;        // current table; updated if resized
3302	>	Node<K,V> next;         // the next entry to use
3303	>	TableStack<K,V> stack, spare; // to save/restore on ForwardingNodes
3304	>	int index;              // index of bin to use next
3305	>	int baseIndex;          // current index of initial table
3306	>	int baseLimit;          // index bound for initial table
3307	>	final int baseSize;     // initial table size
3308	>
3309	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3310	>	this.tab = tab;
3311	>	this.baseSize = size;
3312	>	this.baseIndex = this.index = index;
3313	>	this.baseLimit = limit;
3314	>	this.next = null;
3315	>	}
3316	>
3317	>	/**
3318	>	* Advances if possible, returning next valid node, or null if none.
3319	>	*/
3320	>	final Node<K,V> advance() {
3321	>	Node<K,V> e;
3322	>	if ((e = next) != null)
3323	>	e = e.next;
3324	>	for (;;) {
3325	>	Node<K,V>[] t; int i, n;  // must use locals in checks
3326	>	if (e != null)
3327	>	return next = e;
3328	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3329	>	(n = t.length) <= (i = index) || i < 0)
3330	>	return next = null;
3331	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
3332	>	if (e instanceof ForwardingNode) {
3333	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3334	>	e = null;
3335	>	pushState(t, i, n);
3336	>	continue;
3337	>	}
3338	>	else if (e instanceof TreeBin)
3339	>	e = ((TreeBin<K,V>)e).first;
3340	>	else
3341	>	e = null;
3342	>	}
3343	>	if (stack != null)
3344	>	recoverState(n);
3345	>	else if ((index = i + baseSize) >= n)
3346	>	index = ++baseIndex; // visit upper slots if present
3347		}
3348	<	for (Map.Entry<?,?> e : m.entrySet()) {
3349	<	Object mk, mv, v;
3350	<	if ((mk = e.getKey()) == null ||
3351	<	(mv = e.getValue()) == null ||
3352	<	(v = internalGet(mk)) == null ||
3353	<	(mv != v && !mv.equals(v)))
3354	<	return false;
3348	>	}
3349	>
3350	>	/**
3351	>	* Saves traversal state upon encountering a forwarding node.
3352	>	*/
3353	>	private void pushState(Node<K,V>[] t, int i, int n) {
3354	>	TableStack<K,V> s = spare;  // reuse if possible
3355	>	if (s != null)
3356	>	spare = s.next;
3357	>	else
3358	>	s = new TableStack<K,V>();
3359	>	s.tab = t;
3360	>	s.length = n;
3361	>	s.index = i;
3362	>	s.next = stack;
3363	>	stack = s;
3364	>	}
3365	>
3366	>	/**
3367	>	* Possibly pops traversal state.
3368	>	*
3369	>	* @param n length of current table
3370	>	*/
3371	>	private void recoverState(int n) {
3372	>	TableStack<K,V> s; int len;
3373	>	while ((s = stack) != null && (index += (len = s.length)) >= n) {
3374	>	n = len;
3375	>	index = s.index;
3376	>	tab = s.tab;
3377	>	s.tab = null;
3378	>	TableStack<K,V> next = s.next;
3379	>	s.next = spare; // save for reuse
3380	>	stack = next;
3381	>	spare = s;
3382		}
3383	+	if (s == null && (index += baseSize) >= n)
3384	+	index = ++baseIndex;
3385		}
3172	–	return true;
3386		}
3387
3388	<	/* ----------------Iterators -------------- */
3389	<
3390	<	@SuppressWarnings("serial") static final class KeyIterator<K,V> extends Traverser<K,V,Object>
3391	<	implements Spliterator<K>, Enumeration<K> {
3392	<	KeyIterator(ConcurrentHashMap<K, V> map) { super(map); }
3393	<	KeyIterator(Traverser<K,V,Object> it) {
3394	<	super(it);
3388	>	/**
3389	>	* Base of key, value, and entry Iterators. Adds fields to
3390	>	* Traverser to support iterator.remove.
3391	>	*/
3392	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3393	>	final ConcurrentHashMap<K,V> map;
3394	>	Node<K,V> lastReturned;
3395	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3396	>	ConcurrentHashMap<K,V> map) {
3397	>	super(tab, size, index, limit);
3398	>	this.map = map;
3399	>	advance();
3400		}
3401	<	public KeyIterator<K,V> split() {
3402	<	if (nextKey != null)
3401	>
3402	>	public final boolean hasNext() { return next != null; }
3403	>	public final boolean hasMoreElements() { return next != null; }
3404	>
3405	>	public final void remove() {
3406	>	Node<K,V> p;
3407	>	if ((p = lastReturned) == null)
3408		throw new IllegalStateException();
3409	<	return new KeyIterator<K,V>(this);
3409	>	lastReturned = null;
3410	>	map.replaceNode(p.key, null, null);
3411		}
3412	<	@SuppressWarnings("unchecked") public final K next() {
3413	<	if (nextVal == null && advance() == null)
3412	>	}
3413	>
3414	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3415	>	implements Iterator<K>, Enumeration<K> {
3416	>	KeyIterator(Node<K,V>[] tab, int size, int index, int limit,
3417	>	ConcurrentHashMap<K,V> map) {
3418	>	super(tab, size, index, limit, map);
3419	>	}
3420	>
3421	>	public final K next() {
3422	>	Node<K,V> p;
3423	>	if ((p = next) == null)
3424		throw new NoSuchElementException();
3425	<	Object k = nextKey;
3426	<	nextVal = null;
3427	<	return (K) k;
3425	>	K k = p.key;
3426	>	lastReturned = p;
3427	>	advance();
3428	>	return k;
3429		}
3430
3431		public final K nextElement() { return next(); }
3432		}
3433
3434	<	@SuppressWarnings("serial") static final class ValueIterator<K,V> extends Traverser<K,V,Object>
3435	<	implements Spliterator<V>, Enumeration<V> {
3436	<	ValueIterator(ConcurrentHashMap<K, V> map) { super(map); }
3437	<	ValueIterator(Traverser<K,V,Object> it) {
3438	<	super(it);
3204	<	}
3205	<	public ValueIterator<K,V> split() {
3206	<	if (nextKey != null)
3207	<	throw new IllegalStateException();
3208	<	return new ValueIterator<K,V>(this);
3434	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3435	>	implements Iterator<V>, Enumeration<V> {
3436	>	ValueIterator(Node<K,V>[] tab, int size, int index, int limit,
3437	>	ConcurrentHashMap<K,V> map) {
3438	>	super(tab, size, index, limit, map);
3439		}
3440
3441	<	@SuppressWarnings("unchecked") public final V next() {
3442	<	Object v;
3443	<	if ((v = nextVal) == null && (v = advance()) == null)
3441	>	public final V next() {
3442	>	Node<K,V> p;
3443	>	if ((p = next) == null)
3444		throw new NoSuchElementException();
3445	<	nextVal = null;
3446	<	return (V) v;
3445	>	V v = p.val;
3446	>	lastReturned = p;
3447	>	advance();
3448	>	return v;
3449		}
3450
3451		public final V nextElement() { return next(); }
3452		}
3453
3454	<	@SuppressWarnings("serial") static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3455	<	implements Spliterator<Map.Entry<K,V>> {
3456	<	EntryIterator(ConcurrentHashMap<K, V> map) { super(map); }
3457	<	EntryIterator(Traverser<K,V,Object> it) {
3458	<	super(it);
3227	<	}
3228	<	public EntryIterator<K,V> split() {
3229	<	if (nextKey != null)
3230	<	throw new IllegalStateException();
3231	<	return new EntryIterator<K,V>(this);
3454	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3455	>	implements Iterator<Map.Entry<K,V>> {
3456	>	EntryIterator(Node<K,V>[] tab, int size, int index, int limit,
3457	>	ConcurrentHashMap<K,V> map) {
3458	>	super(tab, size, index, limit, map);
3459		}
3460
3461	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3462	<	Object v;
3463	<	if ((v = nextVal) == null && (v = advance()) == null)
3461	>	public final Map.Entry<K,V> next() {
3462	>	Node<K,V> p;
3463	>	if ((p = next) == null)
3464		throw new NoSuchElementException();
3465	<	Object k = nextKey;
3466	<	nextVal = null;
3467	<	return new MapEntry<K,V>((K)k, (V)v, map);
3465	>	K k = p.key;
3466	>	V v = p.val;
3467	>	lastReturned = p;
3468	>	advance();
3469	>	return new MapEntry<K,V>(k, v, map);
3470		}
3471		}
3472
3473		/**
3474	<	* Exported Entry for iterators
3474	>	* Exported Entry for EntryIterator.
3475		*/
3476	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3476	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3477		final K key; // non-null
3478		V val;       // non-null
3479	<	final ConcurrentHashMap<K, V> map;
3480	<	MapEntry(K key, V val, ConcurrentHashMap<K, V> map) {
3479	>	final ConcurrentHashMap<K,V> map;
3480	>	MapEntry(K key, V val, ConcurrentHashMap<K,V> map) {
3481		this.key = key;
3482		this.val = val;
3483		this.map = map;
3484		}
3485	<	public final K getKey()       { return key; }
3486	<	public final V getValue()     { return val; }
3487	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3488	<	public final String toString(){ return key + "=" + val; }
3485	>	public K getKey()        { return key; }
3486	>	public V getValue()      { return val; }
3487	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3488	>	public String toString() {
3489	>	return Helpers.mapEntryToString(key, val);
3490	>	}
3491
3492	<	public final boolean equals(Object o) {
3492	>	public boolean equals(Object o) {
3493		Object k, v; Map.Entry<?,?> e;
3494		return ((o instanceof Map.Entry) &&
3495		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3272 | Line 3503 | public class ConcurrentHashMap<K, V>
3503		* value to return is somewhat arbitrary here. Since we do not
3504		* necessarily track asynchronous changes, the most recent
3505		* "previous" value could be different from what we return (or
3506	<	* could even have been removed in which case the put will
3506	>	* could even have been removed, in which case the put will
3507		* re-establish). We do not and cannot guarantee more.
3508		*/
3509	<	public final V setValue(V value) {
3509	>	public V setValue(V value) {
3510		if (value == null) throw new NullPointerException();
3511		V v = val;
3512		val = value;
#	Line 3284 | Line 3515 | public class ConcurrentHashMap<K, V>
3515		}
3516		}
3517
3518	<	/* ---------------- Serialization Support -------------- */
3518	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3519	>	implements Spliterator<K> {
3520	>	long est;               // size estimate
3521	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3522	>	long est) {
3523	>	super(tab, size, index, limit);
3524	>	this.est = est;
3525	>	}
3526	>
3527	>	public KeySpliterator<K,V> trySplit() {
3528	>	int i, f, h;
3529	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3530	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3531	>	f, est >>>= 1);
3532	>	}
3533
3534	<	/**
3535	<	* Stripped-down version of helper class used in previous version,
3536	<	* declared for the sake of serialization compatibility
3537	<	*/
3538	<	static class Segment<K,V> implements Serializable {
3294	<	private static final long serialVersionUID = 2249069246763182397L;
3295	<	final float loadFactor;
3296	<	Segment(float lf) { this.loadFactor = lf; }
3297	<	}
3534	>	public void forEachRemaining(Consumer<? super K> action) {
3535	>	if (action == null) throw new NullPointerException();
3536	>	for (Node<K,V> p; (p = advance()) != null;)
3537	>	action.accept(p.key);
3538	>	}
3539
3540	<	/**
3541	<	* Saves the state of the {@code ConcurrentHashMap} instance to a
3542	<	* stream (i.e., serializes it).
3543	<	* @param s the stream
3544	<	* @serialData
3545	<	* the key (Object) and value (Object)
3546	<	* for each key-value mapping, followed by a null pair.
3547	<	* The key-value mappings are emitted in no particular order.
3548	<	*/
3549	<	@SuppressWarnings("unchecked") private void writeObject(java.io.ObjectOutputStream s)
3550	<	throws java.io.IOException {
3551	<	if (segments == null) { // for serialization compatibility
3552	<	segments = (Segment<K,V>[])
3553	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
3313	<	for (int i = 0; i < segments.length; ++i)
3314	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
3315	<	}
3316	<	s.defaultWriteObject();
3317	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3318	<	Object v;
3319	<	while ((v = it.advance()) != null) {
3320	<	s.writeObject(it.nextKey);
3321	<	s.writeObject(v);
3540	>	public boolean tryAdvance(Consumer<? super K> action) {
3541	>	if (action == null) throw new NullPointerException();
3542	>	Node<K,V> p;
3543	>	if ((p = advance()) == null)
3544	>	return false;
3545	>	action.accept(p.key);
3546	>	return true;
3547	>	}
3548	>
3549	>	public long estimateSize() { return est; }
3550	>
3551	>	public int characteristics() {
3552	>	return Spliterator.DISTINCT | Spliterator.CONCURRENT |
3553	>	Spliterator.NONNULL;
3554		}
3323	–	s.writeObject(null);
3324	–	s.writeObject(null);
3325	–	segments = null; // throw away
3555		}
3556
3557	<	/**
3558	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3559	<	* @param s the stream
3560	<	*/
3561	<	@SuppressWarnings("unchecked") private void readObject(java.io.ObjectInputStream s)
3562	<	throws java.io.IOException, ClassNotFoundException {
3563	<	s.defaultReadObject();
3564	<	this.segments = null; // unneeded
3336	<	// initialize transient final field
3337	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
3557	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3558	>	implements Spliterator<V> {
3559	>	long est;               // size estimate
3560	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3561	>	long est) {
3562	>	super(tab, size, index, limit);
3563	>	this.est = est;
3564	>	}
3565
3566	<	// Create all nodes, then place in table once size is known
3567	<	long size = 0L;
3568	<	Node p = null;
3569	<	for (;;) {
3570	<	K k = (K) s.readObject();
3344	<	V v = (V) s.readObject();
3345	<	if (k != null && v != null) {
3346	<	int h = spread(k.hashCode());
3347	<	p = new Node(h, k, v, p);
3348	<	++size;
3349	<	}
3350	<	else
3351	<	break;
3566	>	public ValueSpliterator<K,V> trySplit() {
3567	>	int i, f, h;
3568	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3569	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3570	>	f, est >>>= 1);
3571		}
3572	<	if (p != null) {
3573	<	boolean init = false;
3574	<	int n;
3575	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3576	<	n = MAXIMUM_CAPACITY;
3577	<	else {
3578	<	int sz = (int)size;
3579	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
3580	<	}
3581	<	int sc = sizeCtl;
3582	<	boolean collide = false;
3583	<	if (n > sc &&
3584	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
3585	<	try {
3586	<	if (table == null) {
3587	<	init = true;
3588	<	Node[] tab = new Node[n];
3589	<	int mask = n - 1;
3590	<	while (p != null) {
3591	<	int j = p.hash & mask;
3373	<	Node next = p.next;
3374	<	Node q = p.next = tabAt(tab, j);
3375	<	setTabAt(tab, j, p);
3376	<	if (!collide && q != null && q.hash == p.hash)
3377	<	collide = true;
3378	<	p = next;
3379	<	}
3380	<	table = tab;
3381	<	counter.add(size);
3382	<	sc = n - (n >>> 2);
3383	<	}
3384	<	} finally {
3385	<	sizeCtl = sc;
3386	<	}
3387	<	if (collide) { // rescan and convert to TreeBins
3388	<	Node[] tab = table;
3389	<	for (int i = 0; i < tab.length; ++i) {
3390	<	int c = 0;
3391	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
3392	<	if (++c > TREE_THRESHOLD &&
3393	<	(e.key instanceof Comparable)) {
3394	<	replaceWithTreeBin(tab, i, e.key);
3395	<	break;
3396	<	}
3397	<	}
3398	<	}
3399	<	}
3400	<	}
3401	<	if (!init) { // Can only happen if unsafely published.
3402	<	while (p != null) {
3403	<	internalPut(p.key, p.val);
3404	<	p = p.next;
3405	<	}
3406	<	}
3572	>
3573	>	public void forEachRemaining(Consumer<? super V> action) {
3574	>	if (action == null) throw new NullPointerException();
3575	>	for (Node<K,V> p; (p = advance()) != null;)
3576	>	action.accept(p.val);
3577	>	}
3578	>
3579	>	public boolean tryAdvance(Consumer<? super V> action) {
3580	>	if (action == null) throw new NullPointerException();
3581	>	Node<K,V> p;
3582	>	if ((p = advance()) == null)
3583	>	return false;
3584	>	action.accept(p.val);
3585	>	return true;
3586	>	}
3587	>
3588	>	public long estimateSize() { return est; }
3589	>
3590	>	public int characteristics() {
3591	>	return Spliterator.CONCURRENT | Spliterator.NONNULL;
3592		}
3593		}
3594
3595	+	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3596	+	implements Spliterator<Map.Entry<K,V>> {
3597	+	final ConcurrentHashMap<K,V> map; // To export MapEntry
3598	+	long est;               // size estimate
3599	+	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3600	+	long est, ConcurrentHashMap<K,V> map) {
3601	+	super(tab, size, index, limit);
3602	+	this.map = map;
3603	+	this.est = est;
3604	+	}
3605
3606	<	// -------------------------------------------------------
3606	>	public EntrySpliterator<K,V> trySplit() {
3607	>	int i, f, h;
3608	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3609	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3610	>	f, est >>>= 1, map);
3611	>	}
3612
3613	<	// Sams
3614	<	/** Interface describing a void action of one argument */
3615	<	public interface Action<A> { void apply(A a); }
3616	<	/** Interface describing a void action of two arguments */
3617	<	public interface BiAction<A,B> { void apply(A a, B b); }
3418	<	/** Interface describing a function of one argument */
3419	<	public interface Fun<A,T> { T apply(A a); }
3420	<	/** Interface describing a function of two arguments */
3421	<	public interface BiFun<A,B,T> { T apply(A a, B b); }
3422	<	/** Interface describing a function of no arguments */
3423	<	public interface Generator<T> { T apply(); }
3424	<	/** Interface describing a function mapping its argument to a double */
3425	<	public interface ObjectToDouble<A> { double apply(A a); }
3426	<	/** Interface describing a function mapping its argument to a long */
3427	<	public interface ObjectToLong<A> { long apply(A a); }
3428	<	/** Interface describing a function mapping its argument to an int */
3429	<	public interface ObjectToInt<A> {int apply(A a); }
3430	<	/** Interface describing a function mapping two arguments to a double */
3431	<	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
3432	<	/** Interface describing a function mapping two arguments to a long */
3433	<	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
3434	<	/** Interface describing a function mapping two arguments to an int */
3435	<	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
3436	<	/** Interface describing a function mapping a double to a double */
3437	<	public interface DoubleToDouble { double apply(double a); }
3438	<	/** Interface describing a function mapping a long to a long */
3439	<	public interface LongToLong { long apply(long a); }
3440	<	/** Interface describing a function mapping an int to an int */
3441	<	public interface IntToInt { int apply(int a); }
3442	<	/** Interface describing a function mapping two doubles to a double */
3443	<	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3444	<	/** Interface describing a function mapping two longs to a long */
3445	<	public interface LongByLongToLong { long apply(long a, long b); }
3446	<	/** Interface describing a function mapping two ints to an int */
3447	<	public interface IntByIntToInt { int apply(int a, int b); }
3613	>	public void forEachRemaining(Consumer<? super Map.Entry<K,V>> action) {
3614	>	if (action == null) throw new NullPointerException();
3615	>	for (Node<K,V> p; (p = advance()) != null; )
3616	>	action.accept(new MapEntry<K,V>(p.key, p.val, map));
3617	>	}
3618
3619	+	public boolean tryAdvance(Consumer<? super Map.Entry<K,V>> action) {
3620	+	if (action == null) throw new NullPointerException();
3621	+	Node<K,V> p;
3622	+	if ((p = advance()) == null)
3623	+	return false;
3624	+	action.accept(new MapEntry<K,V>(p.key, p.val, map));
3625	+	return true;
3626	+	}
3627
3628	<	// -------------------------------------------------------
3628	>	public long estimateSize() { return est; }
3629	>
3630	>	public int characteristics() {
3631	>	return Spliterator.DISTINCT | Spliterator.CONCURRENT |
3632	>	Spliterator.NONNULL;
3633	>	}
3634	>	}
3635	>
3636	>	// Parallel bulk operations
3637	>
3638	>	/**
3639	>	* Computes initial batch value for bulk tasks. The returned value
3640	>	* is approximately exp2 of the number of times (minus one) to
3641	>	* split task by two before executing leaf action. This value is
3642	>	* faster to compute and more convenient to use as a guide to
3643	>	* splitting than is the depth, since it is used while dividing by
3644	>	* two anyway.
3645	>	*/
3646	>	final int batchFor(long b) {
3647	>	long n;
3648	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3649	>	return 0;
3650	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3651	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3652	>	}
3653
3654		/**
3655		* Performs the given action for each (key, value).
3656		*
3657	+	* @param parallelismThreshold the (estimated) number of elements
3658	+	* needed for this operation to be executed in parallel
3659		* @param action the action
3660	+	* @since 1.8
3661		*/
3662	<	public void forEach(BiAction<K,V> action) {
3663	<	ForkJoinTasks.forEach
3664	<	(this, action).invoke();
3662	>	public void forEach(long parallelismThreshold,
3663	>	BiConsumer<? super K,? super V> action) {
3664	>	if (action == null) throw new NullPointerException();
3665	>	new ForEachMappingTask<K,V>
3666	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3667	>	action).invoke();
3668		}
3669
3670		/**
3671		* Performs the given action for each non-null transformation
3672		* of each (key, value).
3673		*
3674	+	* @param parallelismThreshold the (estimated) number of elements
3675	+	* needed for this operation to be executed in parallel
3676		* @param transformer a function returning the transformation
3677	<	* for an element, or null of there is no transformation (in
3678	<	* which case the action is not applied).
3677	>	* for an element, or null if there is no transformation (in
3678	>	* which case the action is not applied)
3679		* @param action the action
3680	+	* @param <U> the return type of the transformer
3681	+	* @since 1.8
3682		*/
3683	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3684	<	Action<U> action) {
3685	<	ForkJoinTasks.forEach
3686	<	(this, transformer, action).invoke();
3683	>	public <U> void forEach(long parallelismThreshold,
3684	>	BiFunction<? super K, ? super V, ? extends U> transformer,
3685	>	Consumer<? super U> action) {
3686	>	if (transformer == null || action == null)
3687	>	throw new NullPointerException();
3688	>	new ForEachTransformedMappingTask<K,V,U>
3689	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3690	>	transformer, action).invoke();
3691		}
3692
3693		/**
#	Line 3481 | Line 3697 | public class ConcurrentHashMap<K, V>
3697		* results of any other parallel invocations of the search
3698		* function are ignored.
3699		*
3700	+	* @param parallelismThreshold the (estimated) number of elements
3701	+	* needed for this operation to be executed in parallel
3702		* @param searchFunction a function returning a non-null
3703		* result on success, else null
3704	+	* @param <U> the return type of the search function
3705		* @return a non-null result from applying the given search
3706		* function on each (key, value), or null if none
3707	+	* @since 1.8
3708		*/
3709	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3710	<	return ForkJoinTasks.search
3711	<	(this, searchFunction).invoke();
3709	>	public <U> U search(long parallelismThreshold,
3710	>	BiFunction<? super K, ? super V, ? extends U> searchFunction) {
3711	>	if (searchFunction == null) throw new NullPointerException();
3712	>	return new SearchMappingsTask<K,V,U>
3713	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3714	>	searchFunction, new AtomicReference<U>()).invoke();
3715		}
3716
3717		/**
#	Line 3496 | Line 3719 | public class ConcurrentHashMap<K, V>
3719		* of all (key, value) pairs using the given reducer to
3720		* combine values, or null if none.
3721		*
3722	+	* @param parallelismThreshold the (estimated) number of elements
3723	+	* needed for this operation to be executed in parallel
3724		* @param transformer a function returning the transformation
3725	<	* for an element, or null of there is no transformation (in
3726	<	* which case it is not combined).
3725	>	* for an element, or null if there is no transformation (in
3726	>	* which case it is not combined)
3727		* @param reducer a commutative associative combining function
3728	+	* @param <U> the return type of the transformer
3729		* @return the result of accumulating the given transformation
3730		* of all (key, value) pairs
3731	+	* @since 1.8
3732		*/
3733	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3734	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3735	<	return ForkJoinTasks.reduce
3736	<	(this, transformer, reducer).invoke();
3733	>	public <U> U reduce(long parallelismThreshold,
3734	>	BiFunction<? super K, ? super V, ? extends U> transformer,
3735	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
3736	>	if (transformer == null || reducer == null)
3737	>	throw new NullPointerException();
3738	>	return new MapReduceMappingsTask<K,V,U>
3739	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3740	>	null, transformer, reducer).invoke();
3741		}
3742
3743		/**
#	Line 3514 | Line 3745 | public class ConcurrentHashMap<K, V>
3745		* of all (key, value) pairs using the given reducer to
3746		* combine values, and the given basis as an identity value.
3747		*
3748	+	* @param parallelismThreshold the (estimated) number of elements
3749	+	* needed for this operation to be executed in parallel
3750		* @param transformer a function returning the transformation
3751		* for an element
3752		* @param basis the identity (initial default value) for the reduction
3753		* @param reducer a commutative associative combining function
3754		* @return the result of accumulating the given transformation
3755		* of all (key, value) pairs
3756	+	* @since 1.8
3757		*/
3758	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3758	>	public double reduceToDouble(long parallelismThreshold,
3759	>	ToDoubleBiFunction<? super K, ? super V> transformer,
3760		double basis,
3761	<	DoubleByDoubleToDouble reducer) {
3762	<	return ForkJoinTasks.reduceToDouble
3763	<	(this, transformer, basis, reducer).invoke();
3761	>	DoubleBinaryOperator reducer) {
3762	>	if (transformer == null || reducer == null)
3763	>	throw new NullPointerException();
3764	>	return new MapReduceMappingsToDoubleTask<K,V>
3765	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3766	>	null, transformer, basis, reducer).invoke();
3767		}
3768
3769		/**
#	Line 3533 | Line 3771 | public class ConcurrentHashMap<K, V>
3771		* of all (key, value) pairs using the given reducer to
3772		* combine values, and the given basis as an identity value.
3773		*
3774	+	* @param parallelismThreshold the (estimated) number of elements
3775	+	* needed for this operation to be executed in parallel
3776		* @param transformer a function returning the transformation
3777		* for an element
3778		* @param basis the identity (initial default value) for the reduction
3779		* @param reducer a commutative associative combining function
3780		* @return the result of accumulating the given transformation
3781		* of all (key, value) pairs
3782	+	* @since 1.8
3783		*/
3784	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3784	>	public long reduceToLong(long parallelismThreshold,
3785	>	ToLongBiFunction<? super K, ? super V> transformer,
3786		long basis,
3787	<	LongByLongToLong reducer) {
3788	<	return ForkJoinTasks.reduceToLong
3789	<	(this, transformer, basis, reducer).invoke();
3787	>	LongBinaryOperator reducer) {
3788	>	if (transformer == null || reducer == null)
3789	>	throw new NullPointerException();
3790	>	return new MapReduceMappingsToLongTask<K,V>
3791	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3792	>	null, transformer, basis, reducer).invoke();
3793		}
3794
3795		/**
#	Line 3552 | Line 3797 | public class ConcurrentHashMap<K, V>
3797		* of all (key, value) pairs using the given reducer to
3798		* combine values, and the given basis as an identity value.
3799		*
3800	+	* @param parallelismThreshold the (estimated) number of elements
3801	+	* needed for this operation to be executed in parallel
3802		* @param transformer a function returning the transformation
3803		* for an element
3804		* @param basis the identity (initial default value) for the reduction
3805		* @param reducer a commutative associative combining function
3806		* @return the result of accumulating the given transformation
3807		* of all (key, value) pairs
3808	+	* @since 1.8
3809		*/
3810	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3810	>	public int reduceToInt(long parallelismThreshold,
3811	>	ToIntBiFunction<? super K, ? super V> transformer,
3812		int basis,
3813	<	IntByIntToInt reducer) {
3814	<	return ForkJoinTasks.reduceToInt
3815	<	(this, transformer, basis, reducer).invoke();
3813	>	IntBinaryOperator reducer) {
3814	>	if (transformer == null || reducer == null)
3815	>	throw new NullPointerException();
3816	>	return new MapReduceMappingsToIntTask<K,V>
3817	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3818	>	null, transformer, basis, reducer).invoke();
3819		}
3820
3821		/**
3822		* Performs the given action for each key.
3823		*
3824	+	* @param parallelismThreshold the (estimated) number of elements
3825	+	* needed for this operation to be executed in parallel
3826		* @param action the action
3827	+	* @since 1.8
3828		*/
3829	<	public void forEachKey(Action<K> action) {
3830	<	ForkJoinTasks.forEachKey
3831	<	(this, action).invoke();
3829	>	public void forEachKey(long parallelismThreshold,
3830	>	Consumer<? super K> action) {
3831	>	if (action == null) throw new NullPointerException();
3832	>	new ForEachKeyTask<K,V>
3833	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3834	>	action).invoke();
3835		}
3836
3837		/**
3838		* Performs the given action for each non-null transformation
3839		* of each key.
3840		*
3841	+	* @param parallelismThreshold the (estimated) number of elements
3842	+	* needed for this operation to be executed in parallel
3843		* @param transformer a function returning the transformation
3844	<	* for an element, or null of there is no transformation (in
3845	<	* which case the action is not applied).
3844	>	* for an element, or null if there is no transformation (in
3845	>	* which case the action is not applied)
3846		* @param action the action
3847	+	* @param <U> the return type of the transformer
3848	+	* @since 1.8
3849		*/
3850	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3851	<	Action<U> action) {
3852	<	ForkJoinTasks.forEachKey
3853	<	(this, transformer, action).invoke();
3850	>	public <U> void forEachKey(long parallelismThreshold,
3851	>	Function<? super K, ? extends U> transformer,
3852	>	Consumer<? super U> action) {
3853	>	if (transformer == null || action == null)
3854	>	throw new NullPointerException();
3855	>	new ForEachTransformedKeyTask<K,V,U>
3856	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3857	>	transformer, action).invoke();
3858		}
3859
3860		/**
#	Line 3598 | Line 3864 | public class ConcurrentHashMap<K, V>
3864		* any other parallel invocations of the search function are
3865		* ignored.
3866		*
3867	+	* @param parallelismThreshold the (estimated) number of elements
3868	+	* needed for this operation to be executed in parallel
3869		* @param searchFunction a function returning a non-null
3870		* result on success, else null
3871	+	* @param <U> the return type of the search function
3872		* @return a non-null result from applying the given search
3873		* function on each key, or null if none
3874	+	* @since 1.8
3875		*/
3876	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3877	<	return ForkJoinTasks.searchKeys
3878	<	(this, searchFunction).invoke();
3876	>	public <U> U searchKeys(long parallelismThreshold,
3877	>	Function<? super K, ? extends U> searchFunction) {
3878	>	if (searchFunction == null) throw new NullPointerException();
3879	>	return new SearchKeysTask<K,V,U>
3880	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3881	>	searchFunction, new AtomicReference<U>()).invoke();
3882		}
3883
3884		/**
3885		* Returns the result of accumulating all keys using the given
3886		* reducer to combine values, or null if none.
3887		*
3888	+	* @param parallelismThreshold the (estimated) number of elements
3889	+	* needed for this operation to be executed in parallel
3890		* @param reducer a commutative associative combining function
3891		* @return the result of accumulating all keys using the given
3892		* reducer to combine values, or null if none
3893	+	* @since 1.8
3894		*/
3895	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3896	<	return ForkJoinTasks.reduceKeys
3897	<	(this, reducer).invoke();
3895	>	public K reduceKeys(long parallelismThreshold,
3896	>	BiFunction<? super K, ? super K, ? extends K> reducer) {
3897	>	if (reducer == null) throw new NullPointerException();
3898	>	return new ReduceKeysTask<K,V>
3899	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3900	>	null, reducer).invoke();
3901		}
3902
3903		/**
#	Line 3626 | Line 3905 | public class ConcurrentHashMap<K, V>
3905		* of all keys using the given reducer to combine values, or
3906		* null if none.
3907		*
3908	+	* @param parallelismThreshold the (estimated) number of elements
3909	+	* needed for this operation to be executed in parallel
3910		* @param transformer a function returning the transformation
3911	<	* for an element, or null of there is no transformation (in
3912	<	* which case it is not combined).
3911	>	* for an element, or null if there is no transformation (in
3912	>	* which case it is not combined)
3913		* @param reducer a commutative associative combining function
3914	+	* @param <U> the return type of the transformer
3915		* @return the result of accumulating the given transformation
3916		* of all keys
3917	+	* @since 1.8
3918		*/
3919	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3920	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3921	<	return ForkJoinTasks.reduceKeys
3922	<	(this, transformer, reducer).invoke();
3919	>	public <U> U reduceKeys(long parallelismThreshold,
3920	>	Function<? super K, ? extends U> transformer,
3921	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
3922	>	if (transformer == null || reducer == null)
3923	>	throw new NullPointerException();
3924	>	return new MapReduceKeysTask<K,V,U>
3925	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3926	>	null, transformer, reducer).invoke();
3927		}
3928
3929		/**
#	Line 3644 | Line 3931 | public class ConcurrentHashMap<K, V>
3931		* of all keys using the given reducer to combine values, and
3932		* the given basis as an identity value.
3933		*
3934	+	* @param parallelismThreshold the (estimated) number of elements
3935	+	* needed for this operation to be executed in parallel
3936		* @param transformer a function returning the transformation
3937		* for an element
3938		* @param basis the identity (initial default value) for the reduction
3939		* @param reducer a commutative associative combining function
3940	<	* @return  the result of accumulating the given transformation
3940	>	* @return the result of accumulating the given transformation
3941		* of all keys
3942	+	* @since 1.8
3943		*/
3944	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3944	>	public double reduceKeysToDouble(long parallelismThreshold,
3945	>	ToDoubleFunction<? super K> transformer,
3946		double basis,
3947	<	DoubleByDoubleToDouble reducer) {
3948	<	return ForkJoinTasks.reduceKeysToDouble
3949	<	(this, transformer, basis, reducer).invoke();
3947	>	DoubleBinaryOperator reducer) {
3948	>	if (transformer == null || reducer == null)
3949	>	throw new NullPointerException();
3950	>	return new MapReduceKeysToDoubleTask<K,V>
3951	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3952	>	null, transformer, basis, reducer).invoke();
3953		}
3954
3955		/**
#	Line 3663 | Line 3957 | public class ConcurrentHashMap<K, V>
3957		* of all keys using the given reducer to combine values, and
3958		* the given basis as an identity value.
3959		*
3960	+	* @param parallelismThreshold the (estimated) number of elements
3961	+	* needed for this operation to be executed in parallel
3962		* @param transformer a function returning the transformation
3963		* for an element
3964		* @param basis the identity (initial default value) for the reduction
3965		* @param reducer a commutative associative combining function
3966		* @return the result of accumulating the given transformation
3967		* of all keys
3968	+	* @since 1.8
3969		*/
3970	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3970	>	public long reduceKeysToLong(long parallelismThreshold,
3971	>	ToLongFunction<? super K> transformer,
3972		long basis,
3973	<	LongByLongToLong reducer) {
3974	<	return ForkJoinTasks.reduceKeysToLong
3975	<	(this, transformer, basis, reducer).invoke();
3973	>	LongBinaryOperator reducer) {
3974	>	if (transformer == null || reducer == null)
3975	>	throw new NullPointerException();
3976	>	return new MapReduceKeysToLongTask<K,V>
3977	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3978	>	null, transformer, basis, reducer).invoke();
3979		}
3980
3981		/**
#	Line 3682 | Line 3983 | public class ConcurrentHashMap<K, V>
3983		* of all keys using the given reducer to combine values, and
3984		* the given basis as an identity value.
3985		*
3986	+	* @param parallelismThreshold the (estimated) number of elements
3987	+	* needed for this operation to be executed in parallel
3988		* @param transformer a function returning the transformation
3989		* for an element
3990		* @param basis the identity (initial default value) for the reduction
3991		* @param reducer a commutative associative combining function
3992		* @return the result of accumulating the given transformation
3993		* of all keys
3994	+	* @since 1.8
3995		*/
3996	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3996	>	public int reduceKeysToInt(long parallelismThreshold,
3997	>	ToIntFunction<? super K> transformer,
3998		int basis,
3999	<	IntByIntToInt reducer) {
4000	<	return ForkJoinTasks.reduceKeysToInt
4001	<	(this, transformer, basis, reducer).invoke();
3999	>	IntBinaryOperator reducer) {
4000	>	if (transformer == null || reducer == null)
4001	>	throw new NullPointerException();
4002	>	return new MapReduceKeysToIntTask<K,V>
4003	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4004	>	null, transformer, basis, reducer).invoke();
4005		}
4006
4007		/**
4008		* Performs the given action for each value.
4009		*
4010	+	* @param parallelismThreshold the (estimated) number of elements
4011	+	* needed for this operation to be executed in parallel
4012		* @param action the action
4013	+	* @since 1.8
4014		*/
4015	<	public void forEachValue(Action<V> action) {
4016	<	ForkJoinTasks.forEachValue
4017	<	(this, action).invoke();
4015	>	public void forEachValue(long parallelismThreshold,
4016	>	Consumer<? super V> action) {
4017	>	if (action == null)
4018	>	throw new NullPointerException();
4019	>	new ForEachValueTask<K,V>
4020	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4021	>	action).invoke();
4022		}
4023
4024		/**
4025		* Performs the given action for each non-null transformation
4026		* of each value.
4027		*
4028	+	* @param parallelismThreshold the (estimated) number of elements
4029	+	* needed for this operation to be executed in parallel
4030		* @param transformer a function returning the transformation
4031	<	* for an element, or null of there is no transformation (in
4032	<	* which case the action is not applied).
4031	>	* for an element, or null if there is no transformation (in
4032	>	* which case the action is not applied)
4033	>	* @param action the action
4034	>	* @param <U> the return type of the transformer
4035	>	* @since 1.8
4036		*/
4037	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
4038	<	Action<U> action) {
4039	<	ForkJoinTasks.forEachValue
4040	<	(this, transformer, action).invoke();
4037	>	public <U> void forEachValue(long parallelismThreshold,
4038	>	Function<? super V, ? extends U> transformer,
4039	>	Consumer<? super U> action) {
4040	>	if (transformer == null || action == null)
4041	>	throw new NullPointerException();
4042	>	new ForEachTransformedValueTask<K,V,U>
4043	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4044	>	transformer, action).invoke();
4045		}
4046
4047		/**
#	Line 3727 | Line 4051 | public class ConcurrentHashMap<K, V>
4051		* any other parallel invocations of the search function are
4052		* ignored.
4053		*
4054	+	* @param parallelismThreshold the (estimated) number of elements
4055	+	* needed for this operation to be executed in parallel
4056		* @param searchFunction a function returning a non-null
4057		* result on success, else null
4058	+	* @param <U> the return type of the search function
4059		* @return a non-null result from applying the given search
4060		* function on each value, or null if none
4061	<	*
4061	>	* @since 1.8
4062		*/
4063	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
4064	<	return ForkJoinTasks.searchValues
4065	<	(this, searchFunction).invoke();
4063	>	public <U> U searchValues(long parallelismThreshold,
4064	>	Function<? super V, ? extends U> searchFunction) {
4065	>	if (searchFunction == null) throw new NullPointerException();
4066	>	return new SearchValuesTask<K,V,U>
4067	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4068	>	searchFunction, new AtomicReference<U>()).invoke();
4069		}
4070
4071		/**
4072		* Returns the result of accumulating all values using the
4073		* given reducer to combine values, or null if none.
4074		*
4075	+	* @param parallelismThreshold the (estimated) number of elements
4076	+	* needed for this operation to be executed in parallel
4077		* @param reducer a commutative associative combining function
4078	<	* @return  the result of accumulating all values
4078	>	* @return the result of accumulating all values
4079	>	* @since 1.8
4080		*/
4081	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
4082	<	return ForkJoinTasks.reduceValues
4083	<	(this, reducer).invoke();
4081	>	public V reduceValues(long parallelismThreshold,
4082	>	BiFunction<? super V, ? super V, ? extends V> reducer) {
4083	>	if (reducer == null) throw new NullPointerException();
4084	>	return new ReduceValuesTask<K,V>
4085	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4086	>	null, reducer).invoke();
4087		}
4088
4089		/**
#	Line 3755 | Line 4091 | public class ConcurrentHashMap<K, V>
4091		* of all values using the given reducer to combine values, or
4092		* null if none.
4093		*
4094	+	* @param parallelismThreshold the (estimated) number of elements
4095	+	* needed for this operation to be executed in parallel
4096		* @param transformer a function returning the transformation
4097	<	* for an element, or null of there is no transformation (in
4098	<	* which case it is not combined).
4097	>	* for an element, or null if there is no transformation (in
4098	>	* which case it is not combined)
4099		* @param reducer a commutative associative combining function
4100	+	* @param <U> the return type of the transformer
4101		* @return the result of accumulating the given transformation
4102		* of all values
4103	+	* @since 1.8
4104		*/
4105	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
4106	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4107	<	return ForkJoinTasks.reduceValues
4108	<	(this, transformer, reducer).invoke();
4105	>	public <U> U reduceValues(long parallelismThreshold,
4106	>	Function<? super V, ? extends U> transformer,
4107	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
4108	>	if (transformer == null || reducer == null)
4109	>	throw new NullPointerException();
4110	>	return new MapReduceValuesTask<K,V,U>
4111	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4112	>	null, transformer, reducer).invoke();
4113		}
4114
4115		/**
#	Line 3773 | Line 4117 | public class ConcurrentHashMap<K, V>
4117		* of all values using the given reducer to combine values,
4118		* and the given basis as an identity value.
4119		*
4120	+	* @param parallelismThreshold the (estimated) number of elements
4121	+	* needed for this operation to be executed in parallel
4122		* @param transformer a function returning the transformation
4123		* for an element
4124		* @param basis the identity (initial default value) for the reduction
4125		* @param reducer a commutative associative combining function
4126		* @return the result of accumulating the given transformation
4127		* of all values
4128	+	* @since 1.8
4129		*/
4130	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
4130	>	public double reduceValuesToDouble(long parallelismThreshold,
4131	>	ToDoubleFunction<? super V> transformer,
4132		double basis,
4133	<	DoubleByDoubleToDouble reducer) {
4134	<	return ForkJoinTasks.reduceValuesToDouble
4135	<	(this, transformer, basis, reducer).invoke();
4133	>	DoubleBinaryOperator reducer) {
4134	>	if (transformer == null || reducer == null)
4135	>	throw new NullPointerException();
4136	>	return new MapReduceValuesToDoubleTask<K,V>
4137	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4138	>	null, transformer, basis, reducer).invoke();
4139		}
4140
4141		/**
#	Line 3792 | Line 4143 | public class ConcurrentHashMap<K, V>
4143		* of all values using the given reducer to combine values,
4144		* and the given basis as an identity value.
4145		*
4146	+	* @param parallelismThreshold the (estimated) number of elements
4147	+	* needed for this operation to be executed in parallel
4148		* @param transformer a function returning the transformation
4149		* for an element
4150		* @param basis the identity (initial default value) for the reduction
4151		* @param reducer a commutative associative combining function
4152		* @return the result of accumulating the given transformation
4153		* of all values
4154	+	* @since 1.8
4155		*/
4156	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
4156	>	public long reduceValuesToLong(long parallelismThreshold,
4157	>	ToLongFunction<? super V> transformer,
4158		long basis,
4159	<	LongByLongToLong reducer) {
4160	<	return ForkJoinTasks.reduceValuesToLong
4161	<	(this, transformer, basis, reducer).invoke();
4159	>	LongBinaryOperator reducer) {
4160	>	if (transformer == null || reducer == null)
4161	>	throw new NullPointerException();
4162	>	return new MapReduceValuesToLongTask<K,V>
4163	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4164	>	null, transformer, basis, reducer).invoke();
4165		}
4166
4167		/**
#	Line 3811 | Line 4169 | public class ConcurrentHashMap<K, V>
4169		* of all values using the given reducer to combine values,
4170		* and the given basis as an identity value.
4171		*
4172	+	* @param parallelismThreshold the (estimated) number of elements
4173	+	* needed for this operation to be executed in parallel
4174		* @param transformer a function returning the transformation
4175		* for an element
4176		* @param basis the identity (initial default value) for the reduction
4177		* @param reducer a commutative associative combining function
4178		* @return the result of accumulating the given transformation
4179		* of all values
4180	+	* @since 1.8
4181		*/
4182	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
4182	>	public int reduceValuesToInt(long parallelismThreshold,
4183	>	ToIntFunction<? super V> transformer,
4184		int basis,
4185	<	IntByIntToInt reducer) {
4186	<	return ForkJoinTasks.reduceValuesToInt
4187	<	(this, transformer, basis, reducer).invoke();
4185	>	IntBinaryOperator reducer) {
4186	>	if (transformer == null || reducer == null)
4187	>	throw new NullPointerException();
4188	>	return new MapReduceValuesToIntTask<K,V>
4189	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4190	>	null, transformer, basis, reducer).invoke();
4191		}
4192
4193		/**
4194		* Performs the given action for each entry.
4195		*
4196	+	* @param parallelismThreshold the (estimated) number of elements
4197	+	* needed for this operation to be executed in parallel
4198		* @param action the action
4199	+	* @since 1.8
4200		*/
4201	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
4202	<	ForkJoinTasks.forEachEntry
4203	<	(this, action).invoke();
4201	>	public void forEachEntry(long parallelismThreshold,
4202	>	Consumer<? super Map.Entry<K,V>> action) {
4203	>	if (action == null) throw new NullPointerException();
4204	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
4205	>	action).invoke();
4206		}
4207
4208		/**
4209		* Performs the given action for each non-null transformation
4210		* of each entry.
4211		*
4212	+	* @param parallelismThreshold the (estimated) number of elements
4213	+	* needed for this operation to be executed in parallel
4214		* @param transformer a function returning the transformation
4215	<	* for an element, or null of there is no transformation (in
4216	<	* which case the action is not applied).
4215	>	* for an element, or null if there is no transformation (in
4216	>	* which case the action is not applied)
4217		* @param action the action
4218	+	* @param <U> the return type of the transformer
4219	+	* @since 1.8
4220		*/
4221	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
4222	<	Action<U> action) {
4223	<	ForkJoinTasks.forEachEntry
4224	<	(this, transformer, action).invoke();
4221	>	public <U> void forEachEntry(long parallelismThreshold,
4222	>	Function<Map.Entry<K,V>, ? extends U> transformer,
4223	>	Consumer<? super U> action) {
4224	>	if (transformer == null || action == null)
4225	>	throw new NullPointerException();
4226	>	new ForEachTransformedEntryTask<K,V,U>
4227	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4228	>	transformer, action).invoke();
4229		}
4230
4231		/**
#	Line 3857 | Line 4235 | public class ConcurrentHashMap<K, V>
4235		* any other parallel invocations of the search function are
4236		* ignored.
4237		*
4238	+	* @param parallelismThreshold the (estimated) number of elements
4239	+	* needed for this operation to be executed in parallel
4240		* @param searchFunction a function returning a non-null
4241		* result on success, else null
4242	+	* @param <U> the return type of the search function
4243		* @return a non-null result from applying the given search
4244		* function on each entry, or null if none
4245	+	* @since 1.8
4246		*/
4247	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4248	<	return ForkJoinTasks.searchEntries
4249	<	(this, searchFunction).invoke();
4247	>	public <U> U searchEntries(long parallelismThreshold,
4248	>	Function<Map.Entry<K,V>, ? extends U> searchFunction) {
4249	>	if (searchFunction == null) throw new NullPointerException();
4250	>	return new SearchEntriesTask<K,V,U>
4251	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4252	>	searchFunction, new AtomicReference<U>()).invoke();
4253		}
4254
4255		/**
4256		* Returns the result of accumulating all entries using the
4257		* given reducer to combine values, or null if none.
4258		*
4259	+	* @param parallelismThreshold the (estimated) number of elements
4260	+	* needed for this operation to be executed in parallel
4261		* @param reducer a commutative associative combining function
4262		* @return the result of accumulating all entries
4263	+	* @since 1.8
4264		*/
4265	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4266	<	return ForkJoinTasks.reduceEntries
4267	<	(this, reducer).invoke();
4265	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4266	>	BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4267	>	if (reducer == null) throw new NullPointerException();
4268	>	return new ReduceEntriesTask<K,V>
4269	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4270	>	null, reducer).invoke();
4271		}
4272
4273		/**
#	Line 3884 | Line 4275 | public class ConcurrentHashMap<K, V>
4275		* of all entries using the given reducer to combine values,
4276		* or null if none.
4277		*
4278	+	* @param parallelismThreshold the (estimated) number of elements
4279	+	* needed for this operation to be executed in parallel
4280		* @param transformer a function returning the transformation
4281	<	* for an element, or null of there is no transformation (in
4282	<	* which case it is not combined).
4281	>	* for an element, or null if there is no transformation (in
4282	>	* which case it is not combined)
4283		* @param reducer a commutative associative combining function
4284	+	* @param <U> the return type of the transformer
4285		* @return the result of accumulating the given transformation
4286		* of all entries
4287	+	* @since 1.8
4288		*/
4289	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4290	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4291	<	return ForkJoinTasks.reduceEntries
4292	<	(this, transformer, reducer).invoke();
4289	>	public <U> U reduceEntries(long parallelismThreshold,
4290	>	Function<Map.Entry<K,V>, ? extends U> transformer,
4291	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
4292	>	if (transformer == null || reducer == null)
4293	>	throw new NullPointerException();
4294	>	return new MapReduceEntriesTask<K,V,U>
4295	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4296	>	null, transformer, reducer).invoke();
4297		}
4298
4299		/**
#	Line 3902 | Line 4301 | public class ConcurrentHashMap<K, V>
4301		* of all entries using the given reducer to combine values,
4302		* and the given basis as an identity value.
4303		*
4304	+	* @param parallelismThreshold the (estimated) number of elements
4305	+	* needed for this operation to be executed in parallel
4306		* @param transformer a function returning the transformation
4307		* for an element
4308		* @param basis the identity (initial default value) for the reduction
4309		* @param reducer a commutative associative combining function
4310		* @return the result of accumulating the given transformation
4311		* of all entries
4312	+	* @since 1.8
4313		*/
4314	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4314	>	public double reduceEntriesToDouble(long parallelismThreshold,
4315	>	ToDoubleFunction<Map.Entry<K,V>> transformer,
4316		double basis,
4317	<	DoubleByDoubleToDouble reducer) {
4318	<	return ForkJoinTasks.reduceEntriesToDouble
4319	<	(this, transformer, basis, reducer).invoke();
4317	>	DoubleBinaryOperator reducer) {
4318	>	if (transformer == null || reducer == null)
4319	>	throw new NullPointerException();
4320	>	return new MapReduceEntriesToDoubleTask<K,V>
4321	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4322	>	null, transformer, basis, reducer).invoke();
4323		}
4324
4325		/**
#	Line 3921 | Line 4327 | public class ConcurrentHashMap<K, V>
4327		* of all entries using the given reducer to combine values,
4328		* and the given basis as an identity value.
4329		*
4330	+	* @param parallelismThreshold the (estimated) number of elements
4331	+	* needed for this operation to be executed in parallel
4332		* @param transformer a function returning the transformation
4333		* for an element
4334		* @param basis the identity (initial default value) for the reduction
4335		* @param reducer a commutative associative combining function
4336	<	* @return  the result of accumulating the given transformation
4336	>	* @return the result of accumulating the given transformation
4337		* of all entries
4338	+	* @since 1.8
4339		*/
4340	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4340	>	public long reduceEntriesToLong(long parallelismThreshold,
4341	>	ToLongFunction<Map.Entry<K,V>> transformer,
4342		long basis,
4343	<	LongByLongToLong reducer) {
4344	<	return ForkJoinTasks.reduceEntriesToLong
4345	<	(this, transformer, basis, reducer).invoke();
4343	>	LongBinaryOperator reducer) {
4344	>	if (transformer == null || reducer == null)
4345	>	throw new NullPointerException();
4346	>	return new MapReduceEntriesToLongTask<K,V>
4347	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4348	>	null, transformer, basis, reducer).invoke();
4349		}
4350
4351		/**
#	Line 3940 | Line 4353 | public class ConcurrentHashMap<K, V>
4353		* of all entries using the given reducer to combine values,
4354		* and the given basis as an identity value.
4355		*
4356	+	* @param parallelismThreshold the (estimated) number of elements
4357	+	* needed for this operation to be executed in parallel
4358		* @param transformer a function returning the transformation
4359		* for an element
4360		* @param basis the identity (initial default value) for the reduction
4361		* @param reducer a commutative associative combining function
4362		* @return the result of accumulating the given transformation
4363		* of all entries
4364	+	* @since 1.8
4365		*/
4366	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4366	>	public int reduceEntriesToInt(long parallelismThreshold,
4367	>	ToIntFunction<Map.Entry<K,V>> transformer,
4368		int basis,
4369	<	IntByIntToInt reducer) {
4370	<	return ForkJoinTasks.reduceEntriesToInt
4371	<	(this, transformer, basis, reducer).invoke();
4369	>	IntBinaryOperator reducer) {
4370	>	if (transformer == null || reducer == null)
4371	>	throw new NullPointerException();
4372	>	return new MapReduceEntriesToIntTask<K,V>
4373	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4374	>	null, transformer, basis, reducer).invoke();
4375		}
4376
4377	+
4378		/* ----------------Views -------------- */
4379
4380		/**
4381		* Base class for views.
4382		*/
4383	<	static abstract class CHMView<K, V> {
4384	<	final ConcurrentHashMap<K, V> map;
4385	<	CHMView(ConcurrentHashMap<K, V> map)  { this.map = map; }
4383	>	abstract static class CollectionView<K,V,E>
4384	>	implements Collection<E>, java.io.Serializable {
4385	>	private static final long serialVersionUID = 7249069246763182397L;
4386	>	final ConcurrentHashMap<K,V> map;
4387	>	CollectionView(ConcurrentHashMap<K,V> map)  { this.map = map; }
4388
4389		/**
4390		* Returns the map backing this view.
#	Line 3970 | Line 4393 | public class ConcurrentHashMap<K, V>
4393		*/
4394		public ConcurrentHashMap<K,V> getMap() { return map; }
4395
4396	<	public final int size()                 { return map.size(); }
4397	<	public final boolean isEmpty()          { return map.isEmpty(); }
4398	<	public final void clear()               { map.clear(); }
4396	>	/**
4397	>	* Removes all of the elements from this view, by removing all
4398	>	* the mappings from the map backing this view.
4399	>	*/
4400	>	public final void clear()      { map.clear(); }
4401	>	public final int size()        { return map.size(); }
4402	>	public final boolean isEmpty() { return map.isEmpty(); }
4403
4404		// implementations below rely on concrete classes supplying these
4405	<	abstract public Iterator<?> iterator();
4406	<	abstract public boolean contains(Object o);
4407	<	abstract public boolean remove(Object o);
4405	>	// abstract methods
4406	>	/**
4407	>	* Returns an iterator over the elements in this collection.
4408	>	*
4409	>	* <p>The returned iterator is
4410	>	* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>.
4411	>	*
4412	>	* @return an iterator over the elements in this collection
4413	>	*/
4414	>	public abstract Iterator<E> iterator();
4415	>	public abstract boolean contains(Object o);
4416	>	public abstract boolean remove(Object o);
4417
4418	<	private static final String oomeMsg = "Required array size too large";
4418	>	private static final String OOME_MSG = "Required array size too large";
4419
4420		public final Object[] toArray() {
4421		long sz = map.mappingCount();
4422	<	if (sz > (long)(MAX_ARRAY_SIZE))
4423	<	throw new OutOfMemoryError(oomeMsg);
4422	>	if (sz > MAX_ARRAY_SIZE)
4423	>	throw new OutOfMemoryError(OOME_MSG);
4424		int n = (int)sz;
4425		Object[] r = new Object[n];
4426		int i = 0;
4427	<	Iterator<?> it = iterator();
3992	<	while (it.hasNext()) {
4427	>	for (E e : this) {
4428		if (i == n) {
4429		if (n >= MAX_ARRAY_SIZE)
4430	<	throw new OutOfMemoryError(oomeMsg);
4430	>	throw new OutOfMemoryError(OOME_MSG);
4431		if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
4432		n = MAX_ARRAY_SIZE;
4433		else
4434		n += (n >>> 1) + 1;
4435		r = Arrays.copyOf(r, n);
4436		}
4437	<	r[i++] = it.next();
4437	>	r[i++] = e;
4438		}
4439		return (i == n) ? r : Arrays.copyOf(r, i);
4440		}
4441
4442	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4442	>	@SuppressWarnings("unchecked")
4443	>	public final <T> T[] toArray(T[] a) {
4444		long sz = map.mappingCount();
4445	<	if (sz > (long)(MAX_ARRAY_SIZE))
4446	<	throw new OutOfMemoryError(oomeMsg);
4445	>	if (sz > MAX_ARRAY_SIZE)
4446	>	throw new OutOfMemoryError(OOME_MSG);
4447		int m = (int)sz;
4448		T[] r = (a.length >= m) ? a :
4449		(T[])java.lang.reflect.Array
4450		.newInstance(a.getClass().getComponentType(), m);
4451		int n = r.length;
4452		int i = 0;
4453	<	Iterator<?> it = iterator();
4018	<	while (it.hasNext()) {
4453	>	for (E e : this) {
4454		if (i == n) {
4455		if (n >= MAX_ARRAY_SIZE)
4456	<	throw new OutOfMemoryError(oomeMsg);
4456	>	throw new OutOfMemoryError(OOME_MSG);
4457		if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
4458		n = MAX_ARRAY_SIZE;
4459		else
4460		n += (n >>> 1) + 1;
4461		r = Arrays.copyOf(r, n);
4462		}
4463	<	r[i++] = (T)it.next();
4463	>	r[i++] = (T)e;
4464		}
4465		if (a == r && i < n) {
4466		r[i] = null; // null-terminate
#	Line 4034 | Line 4469 | public class ConcurrentHashMap<K, V>
4469		return (i == n) ? r : Arrays.copyOf(r, i);
4470		}
4471
4472	<	public final int hashCode() {
4473	<	int h = 0;
4474	<	for (Iterator<?> it = iterator(); it.hasNext();)
4475	<	h += it.next().hashCode();
4476	<	return h;
4477	<	}
4478	<
4472	>	/**
4473	>	* Returns a string representation of this collection.
4474	>	* The string representation consists of the string representations
4475	>	* of the collection's elements in the order they are returned by
4476	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4477	>	* Adjacent elements are separated by the characters {@code ", "}
4478	>	* (comma and space).  Elements are converted to strings as by
4479	>	* {@link String#valueOf(Object)}.
4480	>	*
4481	>	* @return a string representation of this collection
4482	>	*/
4483		public final String toString() {
4484		StringBuilder sb = new StringBuilder();
4485		sb.append('[');
4486	<	Iterator<?> it = iterator();
4486	>	Iterator<E> it = iterator();
4487		if (it.hasNext()) {
4488		for (;;) {
4489		Object e = it.next();
#	Line 4059 | Line 4498 | public class ConcurrentHashMap<K, V>
4498
4499		public final boolean containsAll(Collection<?> c) {
4500		if (c != this) {
4501	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
4063	<	Object e = it.next();
4501	>	for (Object e : c) {
4502		if (e == null || !contains(e))
4503		return false;
4504		}
#	Line 4068 | Line 4506 | public class ConcurrentHashMap<K, V>
4506		return true;
4507		}
4508
4509	<	public final boolean removeAll(Collection<?> c) {
4509	>	public boolean removeAll(Collection<?> c) {
4510	>	if (c == null) throw new NullPointerException();
4511		boolean modified = false;
4512	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4513	<	if (c.contains(it.next())) {
4514	<	it.remove();
4515	<	modified = true;
4512	>	// Use (c instanceof Set) as a hint that lookup in c is as
4513	>	// efficient as this view
4514	>	Node<K,V>[] t;
4515	>	if ((t = map.table) == null) {
4516	>	return false;
4517	>	} else if (c instanceof Set<?> && c.size() > t.length) {
4518	>	for (Iterator<?> it = iterator(); it.hasNext(); ) {
4519	>	if (c.contains(it.next())) {
4520	>	it.remove();
4521	>	modified = true;
4522	>	}
4523		}
4524	+	} else {
4525	+	for (Object e : c)
4526	+	modified |= remove(e);
4527		}
4528		return modified;
4529		}
4530
4531		public final boolean retainAll(Collection<?> c) {
4532	+	if (c == null) throw new NullPointerException();
4533		boolean modified = false;
4534	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4534	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4535		if (!c.contains(it.next())) {
4536		it.remove();
4537		modified = true;
#	Line 4095 | Line 4545 | public class ConcurrentHashMap<K, V>
4545		/**
4546		* A view of a ConcurrentHashMap as a {@link Set} of keys, in
4547		* which additions may optionally be enabled by mapping to a
4548	<	* common value.  This class cannot be directly instantiated. See
4549	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4550	<	* {@link #newKeySet(int)}.
4548	>	* common value.  This class cannot be directly instantiated.
4549	>	* See {@link #keySet() keySet()},
4550	>	* {@link #keySet(Object) keySet(V)},
4551	>	* {@link #newKeySet() newKeySet()},
4552	>	* {@link #newKeySet(int) newKeySet(int)}.
4553	>	*
4554	>	* @since 1.8
4555		*/
4556	<	public static class KeySetView<K,V> extends CHMView<K,V> implements Set<K>, java.io.Serializable {
4556	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4557	>	implements Set<K>, java.io.Serializable {
4558		private static final long serialVersionUID = 7249069246763182397L;
4559		private final V value;
4560	<	KeySetView(ConcurrentHashMap<K, V> map, V value) {  // non-public
4560	>	KeySetView(ConcurrentHashMap<K,V> map, V value) {  // non-public
4561		super(map);
4562		this.value = value;
4563		}
#	Line 4112 | Line 4567 | public class ConcurrentHashMap<K, V>
4567		* or {@code null} if additions are not supported.
4568		*
4569		* @return the default mapped value for additions, or {@code null}
4570	<	* if not supported.
4570	>	* if not supported
4571		*/
4572		public V getMappedValue() { return value; }
4573
4574	<	// implement Set API
4575	<
4574	>	/**
4575	>	* {@inheritDoc}
4576	>	* @throws NullPointerException if the specified key is null
4577	>	*/
4578		public boolean contains(Object o) { return map.containsKey(o); }
4122	–	public boolean remove(Object o)   { return map.remove(o) != null; }
4579
4580		/**
4581	<	* Returns a "weakly consistent" iterator that will never
4582	<	* throw {@link ConcurrentModificationException}, and
4583	<	* guarantees to traverse elements as they existed upon
4584	<	* construction of the iterator, and may (but is not
4585	<	* guaranteed to) reflect any modifications subsequent to
4586	<	* construction.
4581	>	* Removes the key from this map view, by removing the key (and its
4582	>	* corresponding value) from the backing map.  This method does
4583	>	* nothing if the key is not in the map.
4584	>	*
4585	>	* @param  o the key to be removed from the backing map
4586	>	* @return {@code true} if the backing map contained the specified key
4587	>	* @throws NullPointerException if the specified key is null
4588	>	*/
4589	>	public boolean remove(Object o) { return map.remove(o) != null; }
4590	>
4591	>	/**
4592	>	* @return an iterator over the keys of the backing map
4593	>	*/
4594	>	public Iterator<K> iterator() {
4595	>	Node<K,V>[] t;
4596	>	ConcurrentHashMap<K,V> m = map;
4597	>	int f = (t = m.table) == null ? 0 : t.length;
4598	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4599	>	}
4600	>
4601	>	/**
4602	>	* Adds the specified key to this set view by mapping the key to
4603	>	* the default mapped value in the backing map, if defined.
4604		*
4605	<	* @return an iterator over the keys of this map
4605	>	* @param e key to be added
4606	>	* @return {@code true} if this set changed as a result of the call
4607	>	* @throws NullPointerException if the specified key is null
4608	>	* @throws UnsupportedOperationException if no default mapped value
4609	>	* for additions was provided
4610		*/
4134	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4611		public boolean add(K e) {
4612		V v;
4613		if ((v = value) == null)
4614		throw new UnsupportedOperationException();
4615	<	if (e == null)
4140	<	throw new NullPointerException();
4141	<	return map.internalPutIfAbsent(e, v) == null;
4615	>	return map.putVal(e, v, true) == null;
4616		}
4617	+
4618	+	/**
4619	+	* Adds all of the elements in the specified collection to this set,
4620	+	* as if by calling {@link #add} on each one.
4621	+	*
4622	+	* @param c the elements to be inserted into this set
4623	+	* @return {@code true} if this set changed as a result of the call
4624	+	* @throws NullPointerException if the collection or any of its
4625	+	* elements are {@code null}
4626	+	* @throws UnsupportedOperationException if no default mapped value
4627	+	* for additions was provided
4628	+	*/
4629		public boolean addAll(Collection<? extends K> c) {
4630		boolean added = false;
4631		V v;
4632		if ((v = value) == null)
4633		throw new UnsupportedOperationException();
4634		for (K e : c) {
4635	<	if (e == null)
4150	<	throw new NullPointerException();
4151	<	if (map.internalPutIfAbsent(e, v) == null)
4635	>	if (map.putVal(e, v, true) == null)
4636		added = true;
4637		}
4638		return added;
4639		}
4640	+
4641	+	public int hashCode() {
4642	+	int h = 0;
4643	+	for (K e : this)
4644	+	h += e.hashCode();
4645	+	return h;
4646	+	}
4647	+
4648		public boolean equals(Object o) {
4649		Set<?> c;
4650		return ((o instanceof Set) &&
#	Line 4160 | Line 4652 | public class ConcurrentHashMap<K, V>
4652		(containsAll(c) && c.containsAll(this))));
4653		}
4654
4655	<	/**
4656	<	* Performs the given action for each key.
4657	<	*
4658	<	* @param action the action
4659	<	*/
4660	<	public void forEach(Action<K> action) {
4169	<	ForkJoinTasks.forEachKey
4170	<	(map, action).invoke();
4171	<	}
4172	<
4173	<	/**
4174	<	* Performs the given action for each non-null transformation
4175	<	* of each key.
4176	<	*
4177	<	* @param transformer a function returning the transformation
4178	<	* for an element, or null of there is no transformation (in
4179	<	* which case the action is not applied).
4180	<	* @param action the action
4181	<	*/
4182	<	public <U> void forEach(Fun<? super K, ? extends U> transformer,
4183	<	Action<U> action) {
4184	<	ForkJoinTasks.forEachKey
4185	<	(map, transformer, action).invoke();
4655	>	public Spliterator<K> spliterator() {
4656	>	Node<K,V>[] t;
4657	>	ConcurrentHashMap<K,V> m = map;
4658	>	long n = m.sumCount();
4659	>	int f = (t = m.table) == null ? 0 : t.length;
4660	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4661		}
4662
4663	<	/**
4664	<	* Returns a non-null result from applying the given search
4665	<	* function on each key, or null if none. Upon success,
4666	<	* further element processing is suppressed and the results of
4667	<	* any other parallel invocations of the search function are
4668	<	* ignored.
4669	<	*
4670	<	* @param searchFunction a function returning a non-null
4196	<	* result on success, else null
4197	<	* @return a non-null result from applying the given search
4198	<	* function on each key, or null if none
4199	<	*/
4200	<	public <U> U search(Fun<? super K, ? extends U> searchFunction) {
4201	<	return ForkJoinTasks.searchKeys
4202	<	(map, searchFunction).invoke();
4203	<	}
4204	<
4205	<	/**
4206	<	* Returns the result of accumulating all keys using the given
4207	<	* reducer to combine values, or null if none.
4208	<	*
4209	<	* @param reducer a commutative associative combining function
4210	<	* @return the result of accumulating all keys using the given
4211	<	* reducer to combine values, or null if none
4212	<	*/
4213	<	public K reduce(BiFun<? super K, ? super K, ? extends K> reducer) {
4214	<	return ForkJoinTasks.reduceKeys
4215	<	(map, reducer).invoke();
4216	<	}
4217	<
4218	<	/**
4219	<	* Returns the result of accumulating the given transformation
4220	<	* of all keys using the given reducer to combine values, and
4221	<	* the given basis as an identity value.
4222	<	*
4223	<	* @param transformer a function returning the transformation
4224	<	* for an element
4225	<	* @param basis the identity (initial default value) for the reduction
4226	<	* @param reducer a commutative associative combining function
4227	<	* @return  the result of accumulating the given transformation
4228	<	* of all keys
4229	<	*/
4230	<	public double reduceToDouble(ObjectToDouble<? super K> transformer,
4231	<	double basis,
4232	<	DoubleByDoubleToDouble reducer) {
4233	<	return ForkJoinTasks.reduceKeysToDouble
4234	<	(map, transformer, basis, reducer).invoke();
4235	<	}
4236	<
4237	<
4238	<	/**
4239	<	* Returns the result of accumulating the given transformation
4240	<	* of all keys using the given reducer to combine values, and
4241	<	* the given basis as an identity value.
4242	<	*
4243	<	* @param transformer a function returning the transformation
4244	<	* for an element
4245	<	* @param basis the identity (initial default value) for the reduction
4246	<	* @param reducer a commutative associative combining function
4247	<	* @return the result of accumulating the given transformation
4248	<	* of all keys
4249	<	*/
4250	<	public long reduceToLong(ObjectToLong<? super K> transformer,
4251	<	long basis,
4252	<	LongByLongToLong reducer) {
4253	<	return ForkJoinTasks.reduceKeysToLong
4254	<	(map, transformer, basis, reducer).invoke();
4255	<	}
4256	<
4257	<	/**
4258	<	* Returns the result of accumulating the given transformation
4259	<	* of all keys using the given reducer to combine values, and
4260	<	* the given basis as an identity value.
4261	<	*
4262	<	* @param transformer a function returning the transformation
4263	<	* for an element
4264	<	* @param basis the identity (initial default value) for the reduction
4265	<	* @param reducer a commutative associative combining function
4266	<	* @return the result of accumulating the given transformation
4267	<	* of all keys
4268	<	*/
4269	<	public int reduceToInt(ObjectToInt<? super K> transformer,
4270	<	int basis,
4271	<	IntByIntToInt reducer) {
4272	<	return ForkJoinTasks.reduceKeysToInt
4273	<	(map, transformer, basis, reducer).invoke();
4663	>	public void forEach(Consumer<? super K> action) {
4664	>	if (action == null) throw new NullPointerException();
4665	>	Node<K,V>[] t;
4666	>	if ((t = map.table) != null) {
4667	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4668	>	for (Node<K,V> p; (p = it.advance()) != null; )
4669	>	action.accept(p.key);
4670	>	}
4671		}
4275	–
4672		}
4673
4674		/**
4675		* A view of a ConcurrentHashMap as a {@link Collection} of
4676		* values, in which additions are disabled. This class cannot be
4677	<	* directly instantiated. See {@link #values},
4678	<	*
4679	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4680	<	* that will never throw {@link ConcurrentModificationException},
4681	<	* and guarantees to traverse elements as they existed upon
4682	<	* construction of the iterator, and may (but is not guaranteed to)
4683	<	* reflect any modifications subsequent to construction.
4684	<	*/
4685	<	public static final class ValuesView<K,V> extends CHMView<K,V>
4686	<	implements Collection<V> {
4291	<	ValuesView(ConcurrentHashMap<K, V> map)   { super(map); }
4292	<	public final boolean contains(Object o) { return map.containsValue(o); }
4677	>	* directly instantiated. See {@link #values()}.
4678	>	*/
4679	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4680	>	implements Collection<V>, java.io.Serializable {
4681	>	private static final long serialVersionUID = 2249069246763182397L;
4682	>	ValuesView(ConcurrentHashMap<K,V> map) { super(map); }
4683	>	public final boolean contains(Object o) {
4684	>	return map.containsValue(o);
4685	>	}
4686	>
4687		public final boolean remove(Object o) {
4688		if (o != null) {
4689	<	Iterator<V> it = new ValueIterator<K,V>(map);
4296	<	while (it.hasNext()) {
4689	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4690		if (o.equals(it.next())) {
4691		it.remove();
4692		return true;
#	Line 4303 | Line 4696 | public class ConcurrentHashMap<K, V>
4696		return false;
4697		}
4698
4306	–	/**
4307	–	* Returns a "weakly consistent" iterator that will never
4308	–	* throw {@link ConcurrentModificationException}, and
4309	–	* guarantees to traverse elements as they existed upon
4310	–	* construction of the iterator, and may (but is not
4311	–	* guaranteed to) reflect any modifications subsequent to
4312	–	* construction.
4313	–	*
4314	–	* @return an iterator over the values of this map
4315	–	*/
4699		public final Iterator<V> iterator() {
4700	<	return new ValueIterator<K,V>(map);
4700	>	ConcurrentHashMap<K,V> m = map;
4701	>	Node<K,V>[] t;
4702	>	int f = (t = m.table) == null ? 0 : t.length;
4703	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4704		}
4705	+
4706		public final boolean add(V e) {
4707		throw new UnsupportedOperationException();
4708		}
#	Line 4323 | Line 4710 | public class ConcurrentHashMap<K, V>
4710		throw new UnsupportedOperationException();
4711		}
4712
4713	<	/**
4714	<	* Performs the given action for each value.
4715	<	*
4716	<	* @param action the action
4717	<	*/
4718	<	public void forEach(Action<V> action) {
4719	<	ForkJoinTasks.forEachValue
4720	<	(map, action).invoke();
4721	<	}
4722	<
4336	<	/**
4337	<	* Performs the given action for each non-null transformation
4338	<	* of each value.
4339	<	*
4340	<	* @param transformer a function returning the transformation
4341	<	* for an element, or null of there is no transformation (in
4342	<	* which case the action is not applied).
4343	<	*/
4344	<	public <U> void forEach(Fun<? super V, ? extends U> transformer,
4345	<	Action<U> action) {
4346	<	ForkJoinTasks.forEachValue
4347	<	(map, transformer, action).invoke();
4348	<	}
4349	<
4350	<	/**
4351	<	* Returns a non-null result from applying the given search
4352	<	* function on each value, or null if none.  Upon success,
4353	<	* further element processing is suppressed and the results of
4354	<	* any other parallel invocations of the search function are
4355	<	* ignored.
4356	<	*
4357	<	* @param searchFunction a function returning a non-null
4358	<	* result on success, else null
4359	<	* @return a non-null result from applying the given search
4360	<	* function on each value, or null if none
4361	<	*
4362	<	*/
4363	<	public <U> U search(Fun<? super V, ? extends U> searchFunction) {
4364	<	return ForkJoinTasks.searchValues
4365	<	(map, searchFunction).invoke();
4366	<	}
4367	<
4368	<	/**
4369	<	* Returns the result of accumulating all values using the
4370	<	* given reducer to combine values, or null if none.
4371	<	*
4372	<	* @param reducer a commutative associative combining function
4373	<	* @return  the result of accumulating all values
4374	<	*/
4375	<	public V reduce(BiFun<? super V, ? super V, ? extends V> reducer) {
4376	<	return ForkJoinTasks.reduceValues
4377	<	(map, reducer).invoke();
4378	<	}
4379	<
4380	<	/**
4381	<	* Returns the result of accumulating the given transformation
4382	<	* of all values using the given reducer to combine values, or
4383	<	* null if none.
4384	<	*
4385	<	* @param transformer a function returning the transformation
4386	<	* for an element, or null of there is no transformation (in
4387	<	* which case it is not combined).
4388	<	* @param reducer a commutative associative combining function
4389	<	* @return the result of accumulating the given transformation
4390	<	* of all values
4391	<	*/
4392	<	public <U> U reduce(Fun<? super V, ? extends U> transformer,
4393	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4394	<	return ForkJoinTasks.reduceValues
4395	<	(map, transformer, reducer).invoke();
4713	>	@Override public boolean removeAll(Collection<?> c) {
4714	>	if (c == null) throw new NullPointerException();
4715	>	boolean modified = false;
4716	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4717	>	if (c.contains(it.next())) {
4718	>	it.remove();
4719	>	modified = true;
4720	>	}
4721	>	}
4722	>	return modified;
4723		}
4724
4725	<	/**
4726	<	* Returns the result of accumulating the given transformation
4400	<	* of all values using the given reducer to combine values,
4401	<	* and the given basis as an identity value.
4402	<	*
4403	<	* @param transformer a function returning the transformation
4404	<	* for an element
4405	<	* @param basis the identity (initial default value) for the reduction
4406	<	* @param reducer a commutative associative combining function
4407	<	* @return the result of accumulating the given transformation
4408	<	* of all values
4409	<	*/
4410	<	public double reduceToDouble(ObjectToDouble<? super V> transformer,
4411	<	double basis,
4412	<	DoubleByDoubleToDouble reducer) {
4413	<	return ForkJoinTasks.reduceValuesToDouble
4414	<	(map, transformer, basis, reducer).invoke();
4725	>	public boolean removeIf(Predicate<? super V> filter) {
4726	>	return map.removeValueIf(filter);
4727		}
4728
4729	<	/**
4730	<	* Returns the result of accumulating the given transformation
4731	<	* of all values using the given reducer to combine values,
4732	<	* and the given basis as an identity value.
4733	<	*
4734	<	* @param transformer a function returning the transformation
4423	<	* for an element
4424	<	* @param basis the identity (initial default value) for the reduction
4425	<	* @param reducer a commutative associative combining function
4426	<	* @return the result of accumulating the given transformation
4427	<	* of all values
4428	<	*/
4429	<	public long reduceToLong(ObjectToLong<? super V> transformer,
4430	<	long basis,
4431	<	LongByLongToLong reducer) {
4432	<	return ForkJoinTasks.reduceValuesToLong
4433	<	(map, transformer, basis, reducer).invoke();
4729	>	public Spliterator<V> spliterator() {
4730	>	Node<K,V>[] t;
4731	>	ConcurrentHashMap<K,V> m = map;
4732	>	long n = m.sumCount();
4733	>	int f = (t = m.table) == null ? 0 : t.length;
4734	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4735		}
4736
4737	<	/**
4738	<	* Returns the result of accumulating the given transformation
4739	<	* of all values using the given reducer to combine values,
4740	<	* and the given basis as an identity value.
4741	<	*
4742	<	* @param transformer a function returning the transformation
4743	<	* for an element
4744	<	* @param basis the identity (initial default value) for the reduction
4444	<	* @param reducer a commutative associative combining function
4445	<	* @return the result of accumulating the given transformation
4446	<	* of all values
4447	<	*/
4448	<	public int reduceToInt(ObjectToInt<? super V> transformer,
4449	<	int basis,
4450	<	IntByIntToInt reducer) {
4451	<	return ForkJoinTasks.reduceValuesToInt
4452	<	(map, transformer, basis, reducer).invoke();
4737	>	public void forEach(Consumer<? super V> action) {
4738	>	if (action == null) throw new NullPointerException();
4739	>	Node<K,V>[] t;
4740	>	if ((t = map.table) != null) {
4741	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4742	>	for (Node<K,V> p; (p = it.advance()) != null; )
4743	>	action.accept(p.val);
4744	>	}
4745		}
4454	–
4746		}
4747
4748		/**
4749		* A view of a ConcurrentHashMap as a {@link Set} of (key, value)
4750		* entries.  This class cannot be directly instantiated. See
4751	<	* {@link #entrySet}.
4751	>	* {@link #entrySet()}.
4752		*/
4753	<	public static final class EntrySetView<K,V> extends CHMView<K,V>
4754	<	implements Set<Map.Entry<K,V>> {
4755	<	EntrySetView(ConcurrentHashMap<K, V> map) { super(map); }
4756	<	public final boolean contains(Object o) {
4753	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4754	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4755	>	private static final long serialVersionUID = 2249069246763182397L;
4756	>	EntrySetView(ConcurrentHashMap<K,V> map) { super(map); }
4757	>
4758	>	public boolean contains(Object o) {
4759		Object k, v, r; Map.Entry<?,?> e;
4760		return ((o instanceof Map.Entry) &&
4761		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4470 | Line 4763 | public class ConcurrentHashMap<K, V>
4763		(v = e.getValue()) != null &&
4764		(v == r || v.equals(r)));
4765		}
4766	<	public final boolean remove(Object o) {
4766	>
4767	>	public boolean remove(Object o) {
4768		Object k, v; Map.Entry<?,?> e;
4769		return ((o instanceof Map.Entry) &&
4770		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4479 | Line 4773 | public class ConcurrentHashMap<K, V>
4773		}
4774
4775		/**
4776	<	* Returns a "weakly consistent" iterator that will never
4483	<	* throw {@link ConcurrentModificationException}, and
4484	<	* guarantees to traverse elements as they existed upon
4485	<	* construction of the iterator, and may (but is not
4486	<	* guaranteed to) reflect any modifications subsequent to
4487	<	* construction.
4488	<	*
4489	<	* @return an iterator over the entries of this map
4776	>	* @return an iterator over the entries of the backing map
4777		*/
4778	<	public final Iterator<Map.Entry<K,V>> iterator() {
4779	<	return new EntryIterator<K,V>(map);
4778	>	public Iterator<Map.Entry<K,V>> iterator() {
4779	>	ConcurrentHashMap<K,V> m = map;
4780	>	Node<K,V>[] t;
4781	>	int f = (t = m.table) == null ? 0 : t.length;
4782	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4783		}
4784
4785	<	public final boolean add(Entry<K,V> e) {
4786	<	K key = e.getKey();
4497	<	V value = e.getValue();
4498	<	if (key == null || value == null)
4499	<	throw new NullPointerException();
4500	<	return map.internalPut(key, value) == null;
4785	>	public boolean add(Entry<K,V> e) {
4786	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4787		}
4788	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4788	>
4789	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4790		boolean added = false;
4791		for (Entry<K,V> e : c) {
4792		if (add(e))
#	Line 4507 | Line 4794 | public class ConcurrentHashMap<K, V>
4794		}
4795		return added;
4796		}
4510	–	public boolean equals(Object o) {
4511	–	Set<?> c;
4512	–	return ((o instanceof Set) &&
4513	–	((c = (Set<?>)o) == this ||
4514	–	(containsAll(c) && c.containsAll(this))));
4515	–	}
4516	–
4517	–	/**
4518	–	* Performs the given action for each entry.
4519	–	*
4520	–	* @param action the action
4521	–	*/
4522	–	public void forEach(Action<Map.Entry<K,V>> action) {
4523	–	ForkJoinTasks.forEachEntry
4524	–	(map, action).invoke();
4525	–	}
4526	–
4527	–	/**
4528	–	* Performs the given action for each non-null transformation
4529	–	* of each entry.
4530	–	*
4531	–	* @param transformer a function returning the transformation
4532	–	* for an element, or null of there is no transformation (in
4533	–	* which case the action is not applied).
4534	–	* @param action the action
4535	–	*/
4536	–	public <U> void forEach(Fun<Map.Entry<K,V>, ? extends U> transformer,
4537	–	Action<U> action) {
4538	–	ForkJoinTasks.forEachEntry
4539	–	(map, transformer, action).invoke();
4540	–	}
4797
4798	<	/**
4799	<	* Returns a non-null result from applying the given search
4544	<	* function on each entry, or null if none.  Upon success,
4545	<	* further element processing is suppressed and the results of
4546	<	* any other parallel invocations of the search function are
4547	<	* ignored.
4548	<	*
4549	<	* @param searchFunction a function returning a non-null
4550	<	* result on success, else null
4551	<	* @return a non-null result from applying the given search
4552	<	* function on each entry, or null if none
4553	<	*/
4554	<	public <U> U search(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4555	<	return ForkJoinTasks.searchEntries
4556	<	(map, searchFunction).invoke();
4798	>	public boolean removeIf(Predicate<? super Entry<K,V>> filter) {
4799	>	return map.removeEntryIf(filter);
4800		}
4801
4802	<	/**
4803	<	* Returns the result of accumulating all entries using the
4804	<	* given reducer to combine values, or null if none.
4805	<	*
4806	<	* @param reducer a commutative associative combining function
4807	<	* @return the result of accumulating all entries
4808	<	*/
4809	<	public Map.Entry<K,V> reduce(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4810	<	return ForkJoinTasks.reduceEntries
4811	<	(map, reducer).invoke();
4569	<	}
4570	<
4571	<	/**
4572	<	* Returns the result of accumulating the given transformation
4573	<	* of all entries using the given reducer to combine values,
4574	<	* or null if none.
4575	<	*
4576	<	* @param transformer a function returning the transformation
4577	<	* for an element, or null of there is no transformation (in
4578	<	* which case it is not combined).
4579	<	* @param reducer a commutative associative combining function
4580	<	* @return the result of accumulating the given transformation
4581	<	* of all entries
4582	<	*/
4583	<	public <U> U reduce(Fun<Map.Entry<K,V>, ? extends U> transformer,
4584	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4585	<	return ForkJoinTasks.reduceEntries
4586	<	(map, transformer, reducer).invoke();
4587	<	}
4588	<
4589	<	/**
4590	<	* Returns the result of accumulating the given transformation
4591	<	* of all entries using the given reducer to combine values,
4592	<	* and the given basis as an identity value.
4593	<	*
4594	<	* @param transformer a function returning the transformation
4595	<	* for an element
4596	<	* @param basis the identity (initial default value) for the reduction
4597	<	* @param reducer a commutative associative combining function
4598	<	* @return the result of accumulating the given transformation
4599	<	* of all entries
4600	<	*/
4601	<	public double reduceToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4602	<	double basis,
4603	<	DoubleByDoubleToDouble reducer) {
4604	<	return ForkJoinTasks.reduceEntriesToDouble
4605	<	(map, transformer, basis, reducer).invoke();
4606	<	}
4607	<
4608	<	/**
4609	<	* Returns the result of accumulating the given transformation
4610	<	* of all entries using the given reducer to combine values,
4611	<	* and the given basis as an identity value.
4612	<	*
4613	<	* @param transformer a function returning the transformation
4614	<	* for an element
4615	<	* @param basis the identity (initial default value) for the reduction
4616	<	* @param reducer a commutative associative combining function
4617	<	* @return  the result of accumulating the given transformation
4618	<	* of all entries
4619	<	*/
4620	<	public long reduceToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4621	<	long basis,
4622	<	LongByLongToLong reducer) {
4623	<	return ForkJoinTasks.reduceEntriesToLong
4624	<	(map, transformer, basis, reducer).invoke();
4625	<	}
4626	<
4627	<	/**
4628	<	* Returns the result of accumulating the given transformation
4629	<	* of all entries using the given reducer to combine values,
4630	<	* and the given basis as an identity value.
4631	<	*
4632	<	* @param transformer a function returning the transformation
4633	<	* for an element
4634	<	* @param basis the identity (initial default value) for the reduction
4635	<	* @param reducer a commutative associative combining function
4636	<	* @return the result of accumulating the given transformation
4637	<	* of all entries
4638	<	*/
4639	<	public int reduceToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4640	<	int basis,
4641	<	IntByIntToInt reducer) {
4642	<	return ForkJoinTasks.reduceEntriesToInt
4643	<	(map, transformer, basis, reducer).invoke();
4644	<	}
4645	<
4646	<	}
4647	<
4648	<	// ---------------------------------------------------------------------
4649	<
4650	<	/**
4651	<	* Predefined tasks for performing bulk parallel operations on
4652	<	* ConcurrentHashMaps. These tasks follow the forms and rules used
4653	<	* for bulk operations. Each method has the same name, but returns
4654	<	* a task rather than invoking it. These methods may be useful in
4655	<	* custom applications such as submitting a task without waiting
4656	<	* for completion, using a custom pool, or combining with other
4657	<	* tasks.
4658	<	*/
4659	<	public static class ForkJoinTasks {
4660	<	private ForkJoinTasks() {}
4661	<
4662	<	/**
4663	<	* Returns a task that when invoked, performs the given
4664	<	* action for each (key, value)
4665	<	*
4666	<	* @param map the map
4667	<	* @param action the action
4668	<	* @return the task
4669	<	*/
4670	<	public static <K,V> ForkJoinTask<Void> forEach
4671	<	(ConcurrentHashMap<K,V> map,
4672	<	BiAction<K,V> action) {
4673	<	if (action == null) throw new NullPointerException();
4674	<	return new ForEachMappingTask<K,V>(map, null, -1, null, action);
4675	<	}
4676	<
4677	<	/**
4678	<	* Returns a task that when invoked, performs the given
4679	<	* action for each non-null transformation of each (key, value)
4680	<	*
4681	<	* @param map the map
4682	<	* @param transformer a function returning the transformation
4683	<	* for an element, or null if there is no transformation (in
4684	<	* which case the action is not applied)
4685	<	* @param action the action
4686	<	* @return the task
4687	<	*/
4688	<	public static <K,V,U> ForkJoinTask<Void> forEach
4689	<	(ConcurrentHashMap<K,V> map,
4690	<	BiFun<? super K, ? super V, ? extends U> transformer,
4691	<	Action<U> action) {
4692	<	if (transformer == null || action == null)
4693	<	throw new NullPointerException();
4694	<	return new ForEachTransformedMappingTask<K,V,U>
4695	<	(map, null, -1, null, transformer, action);
4696	<	}
4697	<
4698	<	/**
4699	<	* Returns a task that when invoked, returns a non-null result
4700	<	* from applying the given search function on each (key,
4701	<	* value), or null if none. Upon success, further element
4702	<	* processing is suppressed and the results of any other
4703	<	* parallel invocations of the search function are ignored.
4704	<	*
4705	<	* @param map the map
4706	<	* @param searchFunction a function returning a non-null
4707	<	* result on success, else null
4708	<	* @return the task
4709	<	*/
4710	<	public static <K,V,U> ForkJoinTask<U> search
4711	<	(ConcurrentHashMap<K,V> map,
4712	<	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4713	<	if (searchFunction == null) throw new NullPointerException();
4714	<	return new SearchMappingsTask<K,V,U>
4715	<	(map, null, -1, null, searchFunction,
4716	<	new AtomicReference<U>());
4717	<	}
4718	<
4719	<	/**
4720	<	* Returns a task that when invoked, returns the result of
4721	<	* accumulating the given transformation of all (key, value) pairs
4722	<	* using the given reducer to combine values, or null if none.
4723	<	*
4724	<	* @param map the map
4725	<	* @param transformer a function returning the transformation
4726	<	* for an element, or null if there is no transformation (in
4727	<	* which case it is not combined).
4728	<	* @param reducer a commutative associative combining function
4729	<	* @return the task
4730	<	*/
4731	<	public static <K,V,U> ForkJoinTask<U> reduce
4732	<	(ConcurrentHashMap<K,V> map,
4733	<	BiFun<? super K, ? super V, ? extends U> transformer,
4734	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4735	<	if (transformer == null || reducer == null)
4736	<	throw new NullPointerException();
4737	<	return new MapReduceMappingsTask<K,V,U>
4738	<	(map, null, -1, null, transformer, reducer);
4739	<	}
4740	<
4741	<	/**
4742	<	* Returns a task that when invoked, returns the result of
4743	<	* accumulating the given transformation of all (key, value) pairs
4744	<	* using the given reducer to combine values, and the given
4745	<	* basis as an identity value.
4746	<	*
4747	<	* @param map the map
4748	<	* @param transformer a function returning the transformation
4749	<	* for an element
4750	<	* @param basis the identity (initial default value) for the reduction
4751	<	* @param reducer a commutative associative combining function
4752	<	* @return the task
4753	<	*/
4754	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4755	<	(ConcurrentHashMap<K,V> map,
4756	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
4757	<	double basis,
4758	<	DoubleByDoubleToDouble reducer) {
4759	<	if (transformer == null || reducer == null)
4760	<	throw new NullPointerException();
4761	<	return new MapReduceMappingsToDoubleTask<K,V>
4762	<	(map, null, -1, null, transformer, basis, reducer);
4763	<	}
4764	<
4765	<	/**
4766	<	* Returns a task that when invoked, returns the result of
4767	<	* accumulating the given transformation of all (key, value) pairs
4768	<	* using the given reducer to combine values, and the given
4769	<	* basis as an identity value.
4770	<	*
4771	<	* @param map the map
4772	<	* @param transformer a function returning the transformation
4773	<	* for an element
4774	<	* @param basis the identity (initial default value) for the reduction
4775	<	* @param reducer a commutative associative combining function
4776	<	* @return the task
4777	<	*/
4778	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4779	<	(ConcurrentHashMap<K,V> map,
4780	<	ObjectByObjectToLong<? super K, ? super V> transformer,
4781	<	long basis,
4782	<	LongByLongToLong reducer) {
4783	<	if (transformer == null || reducer == null)
4784	<	throw new NullPointerException();
4785	<	return new MapReduceMappingsToLongTask<K,V>
4786	<	(map, null, -1, null, transformer, basis, reducer);
4787	<	}
4788	<
4789	<	/**
4790	<	* Returns a task that when invoked, returns the result of
4791	<	* accumulating the given transformation of all (key, value) pairs
4792	<	* using the given reducer to combine values, and the given
4793	<	* basis as an identity value.
4794	<	*
4795	<	* @param transformer a function returning the transformation
4796	<	* for an element
4797	<	* @param basis the identity (initial default value) for the reduction
4798	<	* @param reducer a commutative associative combining function
4799	<	* @return the task
4800	<	*/
4801	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4802	<	(ConcurrentHashMap<K,V> map,
4803	<	ObjectByObjectToInt<? super K, ? super V> transformer,
4804	<	int basis,
4805	<	IntByIntToInt reducer) {
4806	<	if (transformer == null || reducer == null)
4807	<	throw new NullPointerException();
4808	<	return new MapReduceMappingsToIntTask<K,V>
4809	<	(map, null, -1, null, transformer, basis, reducer);
4810	<	}
4811	<
4812	<	/**
4813	<	* Returns a task that when invoked, performs the given action
4814	<	* for each key.
4815	<	*
4816	<	* @param map the map
4817	<	* @param action the action
4818	<	* @return the task
4819	<	*/
4820	<	public static <K,V> ForkJoinTask<Void> forEachKey
4821	<	(ConcurrentHashMap<K,V> map,
4822	<	Action<K> action) {
4823	<	if (action == null) throw new NullPointerException();
4824	<	return new ForEachKeyTask<K,V>(map, null, -1, null, action);
4825	<	}
4826	<
4827	<	/**
4828	<	* Returns a task that when invoked, performs the given action
4829	<	* for each non-null transformation of each key.
4830	<	*
4831	<	* @param map the map
4832	<	* @param transformer a function returning the transformation
4833	<	* for an element, or null if there is no transformation (in
4834	<	* which case the action is not applied)
4835	<	* @param action the action
4836	<	* @return the task
4837	<	*/
4838	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4839	<	(ConcurrentHashMap<K,V> map,
4840	<	Fun<? super K, ? extends U> transformer,
4841	<	Action<U> action) {
4842	<	if (transformer == null || action == null)
4843	<	throw new NullPointerException();
4844	<	return new ForEachTransformedKeyTask<K,V,U>
4845	<	(map, null, -1, null, transformer, action);
4846	<	}
4847	<
4848	<	/**
4849	<	* Returns a task that when invoked, returns a non-null result
4850	<	* from applying the given search function on each key, or
4851	<	* null if none.  Upon success, further element processing is
4852	<	* suppressed and the results of any other parallel
4853	<	* invocations of the search function are ignored.
4854	<	*
4855	<	* @param map the map
4856	<	* @param searchFunction a function returning a non-null
4857	<	* result on success, else null
4858	<	* @return the task
4859	<	*/
4860	<	public static <K,V,U> ForkJoinTask<U> searchKeys
4861	<	(ConcurrentHashMap<K,V> map,
4862	<	Fun<? super K, ? extends U> searchFunction) {
4863	<	if (searchFunction == null) throw new NullPointerException();
4864	<	return new SearchKeysTask<K,V,U>
4865	<	(map, null, -1, null, searchFunction,
4866	<	new AtomicReference<U>());
4867	<	}
4868	<
4869	<	/**
4870	<	* Returns a task that when invoked, returns the result of
4871	<	* accumulating all keys using the given reducer to combine
4872	<	* values, or null if none.
4873	<	*
4874	<	* @param map the map
4875	<	* @param reducer a commutative associative combining function
4876	<	* @return the task
4877	<	*/
4878	<	public static <K,V> ForkJoinTask<K> reduceKeys
4879	<	(ConcurrentHashMap<K,V> map,
4880	<	BiFun<? super K, ? super K, ? extends K> reducer) {
4881	<	if (reducer == null) throw new NullPointerException();
4882	<	return new ReduceKeysTask<K,V>
4883	<	(map, null, -1, null, reducer);
4884	<	}
4885	<
4886	<	/**
4887	<	* Returns a task that when invoked, returns the result of
4888	<	* accumulating the given transformation of all keys using the given
4889	<	* reducer to combine values, or null if none.
4890	<	*
4891	<	* @param map the map
4892	<	* @param transformer a function returning the transformation
4893	<	* for an element, or null if there is no transformation (in
4894	<	* which case it is not combined).
4895	<	* @param reducer a commutative associative combining function
4896	<	* @return the task
4897	<	*/
4898	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
4899	<	(ConcurrentHashMap<K,V> map,
4900	<	Fun<? super K, ? extends U> transformer,
4901	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4902	<	if (transformer == null || reducer == null)
4903	<	throw new NullPointerException();
4904	<	return new MapReduceKeysTask<K,V,U>
4905	<	(map, null, -1, null, transformer, reducer);
4906	<	}
4907	<
4908	<	/**
4909	<	* Returns a task that when invoked, returns the result of
4910	<	* accumulating the given transformation of all keys using the given
4911	<	* reducer to combine values, and the given basis as an
4912	<	* identity value.
4913	<	*
4914	<	* @param map the map
4915	<	* @param transformer a function returning the transformation
4916	<	* for an element
4917	<	* @param basis the identity (initial default value) for the reduction
4918	<	* @param reducer a commutative associative combining function
4919	<	* @return the task
4920	<	*/
4921	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4922	<	(ConcurrentHashMap<K,V> map,
4923	<	ObjectToDouble<? super K> transformer,
4924	<	double basis,
4925	<	DoubleByDoubleToDouble reducer) {
4926	<	if (transformer == null || reducer == null)
4927	<	throw new NullPointerException();
4928	<	return new MapReduceKeysToDoubleTask<K,V>
4929	<	(map, null, -1, null, transformer, basis, reducer);
4802	>	public final int hashCode() {
4803	>	int h = 0;
4804	>	Node<K,V>[] t;
4805	>	if ((t = map.table) != null) {
4806	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4807	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4808	>	h += p.hashCode();
4809	>	}
4810	>	}
4811	>	return h;
4812		}
4813
4814	<	/**
4815	<	* Returns a task that when invoked, returns the result of
4816	<	* accumulating the given transformation of all keys using the given
4817	<	* reducer to combine values, and the given basis as an
4818	<	* identity value.
4937	<	*
4938	<	* @param map the map
4939	<	* @param transformer a function returning the transformation
4940	<	* for an element
4941	<	* @param basis the identity (initial default value) for the reduction
4942	<	* @param reducer a commutative associative combining function
4943	<	* @return the task
4944	<	*/
4945	<	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
4946	<	(ConcurrentHashMap<K,V> map,
4947	<	ObjectToLong<? super K> transformer,
4948	<	long basis,
4949	<	LongByLongToLong reducer) {
4950	<	if (transformer == null || reducer == null)
4951	<	throw new NullPointerException();
4952	<	return new MapReduceKeysToLongTask<K,V>
4953	<	(map, null, -1, null, transformer, basis, reducer);
4814	>	public final boolean equals(Object o) {
4815	>	Set<?> c;
4816	>	return ((o instanceof Set) &&
4817	>	((c = (Set<?>)o) == this ||
4818	>	(containsAll(c) && c.containsAll(this))));
4819		}
4820
4821	<	/**
4822	<	* Returns a task that when invoked, returns the result of
4823	<	* accumulating the given transformation of all keys using the given
4824	<	* reducer to combine values, and the given basis as an
4825	<	* identity value.
4826	<	*
4962	<	* @param map the map
4963	<	* @param transformer a function returning the transformation
4964	<	* for an element
4965	<	* @param basis the identity (initial default value) for the reduction
4966	<	* @param reducer a commutative associative combining function
4967	<	* @return the task
4968	<	*/
4969	<	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
4970	<	(ConcurrentHashMap<K,V> map,
4971	<	ObjectToInt<? super K> transformer,
4972	<	int basis,
4973	<	IntByIntToInt reducer) {
4974	<	if (transformer == null || reducer == null)
4975	<	throw new NullPointerException();
4976	<	return new MapReduceKeysToIntTask<K,V>
4977	<	(map, null, -1, null, transformer, basis, reducer);
4821	>	public Spliterator<Map.Entry<K,V>> spliterator() {
4822	>	Node<K,V>[] t;
4823	>	ConcurrentHashMap<K,V> m = map;
4824	>	long n = m.sumCount();
4825	>	int f = (t = m.table) == null ? 0 : t.length;
4826	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4827		}
4828
4829	<	/**
4981	<	* Returns a task that when invoked, performs the given action
4982	<	* for each value.
4983	<	*
4984	<	* @param map the map
4985	<	* @param action the action
4986	<	*/
4987	<	public static <K,V> ForkJoinTask<Void> forEachValue
4988	<	(ConcurrentHashMap<K,V> map,
4989	<	Action<V> action) {
4829	>	public void forEach(Consumer<? super Map.Entry<K,V>> action) {
4830		if (action == null) throw new NullPointerException();
4831	<	return new ForEachValueTask<K,V>(map, null, -1, null, action);
4832	<	}
4833	<
4834	<	/**
4835	<	* Returns a task that when invoked, performs the given action
4836	<	* for each non-null transformation of each value.
4997	<	*
4998	<	* @param map the map
4999	<	* @param transformer a function returning the transformation
5000	<	* for an element, or null if there is no transformation (in
5001	<	* which case the action is not applied)
5002	<	* @param action the action
5003	<	*/
5004	<	public static <K,V,U> ForkJoinTask<Void> forEachValue
5005	<	(ConcurrentHashMap<K,V> map,
5006	<	Fun<? super V, ? extends U> transformer,
5007	<	Action<U> action) {
5008	<	if (transformer == null || action == null)
5009	<	throw new NullPointerException();
5010	<	return new ForEachTransformedValueTask<K,V,U>
5011	<	(map, null, -1, null, transformer, action);
5012	<	}
5013	<
5014	<	/**
5015	<	* Returns a task that when invoked, returns a non-null result
5016	<	* from applying the given search function on each value, or
5017	<	* null if none.  Upon success, further element processing is
5018	<	* suppressed and the results of any other parallel
5019	<	* invocations of the search function are ignored.
5020	<	*
5021	<	* @param map the map
5022	<	* @param searchFunction a function returning a non-null
5023	<	* result on success, else null
5024	<	* @return the task
5025	<	*/
5026	<	public static <K,V,U> ForkJoinTask<U> searchValues
5027	<	(ConcurrentHashMap<K,V> map,
5028	<	Fun<? super V, ? extends U> searchFunction) {
5029	<	if (searchFunction == null) throw new NullPointerException();
5030	<	return new SearchValuesTask<K,V,U>
5031	<	(map, null, -1, null, searchFunction,
5032	<	new AtomicReference<U>());
5033	<	}
5034	<
5035	<	/**
5036	<	* Returns a task that when invoked, returns the result of
5037	<	* accumulating all values using the given reducer to combine
5038	<	* values, or null if none.
5039	<	*
5040	<	* @param map the map
5041	<	* @param reducer a commutative associative combining function
5042	<	* @return the task
5043	<	*/
5044	<	public static <K,V> ForkJoinTask<V> reduceValues
5045	<	(ConcurrentHashMap<K,V> map,
5046	<	BiFun<? super V, ? super V, ? extends V> reducer) {
5047	<	if (reducer == null) throw new NullPointerException();
5048	<	return new ReduceValuesTask<K,V>
5049	<	(map, null, -1, null, reducer);
5050	<	}
5051	<
5052	<	/**
5053	<	* Returns a task that when invoked, returns the result of
5054	<	* accumulating the given transformation of all values using the
5055	<	* given reducer to combine values, or null if none.
5056	<	*
5057	<	* @param map the map
5058	<	* @param transformer a function returning the transformation
5059	<	* for an element, or null if there is no transformation (in
5060	<	* which case it is not combined).
5061	<	* @param reducer a commutative associative combining function
5062	<	* @return the task
5063	<	*/
5064	<	public static <K,V,U> ForkJoinTask<U> reduceValues
5065	<	(ConcurrentHashMap<K,V> map,
5066	<	Fun<? super V, ? extends U> transformer,
5067	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5068	<	if (transformer == null || reducer == null)
5069	<	throw new NullPointerException();
5070	<	return new MapReduceValuesTask<K,V,U>
5071	<	(map, null, -1, null, transformer, reducer);
5072	<	}
5073	<
5074	<	/**
5075	<	* Returns a task that when invoked, returns the result of
5076	<	* accumulating the given transformation of all values using the
5077	<	* given reducer to combine values, and the given basis as an
5078	<	* identity value.
5079	<	*
5080	<	* @param map the map
5081	<	* @param transformer a function returning the transformation
5082	<	* for an element
5083	<	* @param basis the identity (initial default value) for the reduction
5084	<	* @param reducer a commutative associative combining function
5085	<	* @return the task
5086	<	*/
5087	<	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
5088	<	(ConcurrentHashMap<K,V> map,
5089	<	ObjectToDouble<? super V> transformer,
5090	<	double basis,
5091	<	DoubleByDoubleToDouble reducer) {
5092	<	if (transformer == null || reducer == null)
5093	<	throw new NullPointerException();
5094	<	return new MapReduceValuesToDoubleTask<K,V>
5095	<	(map, null, -1, null, transformer, basis, reducer);
5096	<	}
5097	<
5098	<	/**
5099	<	* Returns a task that when invoked, returns the result of
5100	<	* accumulating the given transformation of all values using the
5101	<	* given reducer to combine values, and the given basis as an
5102	<	* identity value.
5103	<	*
5104	<	* @param map the map
5105	<	* @param transformer a function returning the transformation
5106	<	* for an element
5107	<	* @param basis the identity (initial default value) for the reduction
5108	<	* @param reducer a commutative associative combining function
5109	<	* @return the task
5110	<	*/
5111	<	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
5112	<	(ConcurrentHashMap<K,V> map,
5113	<	ObjectToLong<? super V> transformer,
5114	<	long basis,
5115	<	LongByLongToLong reducer) {
5116	<	if (transformer == null || reducer == null)
5117	<	throw new NullPointerException();
5118	<	return new MapReduceValuesToLongTask<K,V>
5119	<	(map, null, -1, null, transformer, basis, reducer);
5120	<	}
5121	<
5122	<	/**
5123	<	* Returns a task that when invoked, returns the result of
5124	<	* accumulating the given transformation of all values using the
5125	<	* given reducer to combine values, and the given basis as an
5126	<	* identity value.
5127	<	*
5128	<	* @param map the map
5129	<	* @param transformer a function returning the transformation
5130	<	* for an element
5131	<	* @param basis the identity (initial default value) for the reduction
5132	<	* @param reducer a commutative associative combining function
5133	<	* @return the task
5134	<	*/
5135	<	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
5136	<	(ConcurrentHashMap<K,V> map,
5137	<	ObjectToInt<? super V> transformer,
5138	<	int basis,
5139	<	IntByIntToInt reducer) {
5140	<	if (transformer == null || reducer == null)
5141	<	throw new NullPointerException();
5142	<	return new MapReduceValuesToIntTask<K,V>
5143	<	(map, null, -1, null, transformer, basis, reducer);
5144	<	}
5145	<
5146	<	/**
5147	<	* Returns a task that when invoked, perform the given action
5148	<	* for each entry.
5149	<	*
5150	<	* @param map the map
5151	<	* @param action the action
5152	<	*/
5153	<	public static <K,V> ForkJoinTask<Void> forEachEntry
5154	<	(ConcurrentHashMap<K,V> map,
5155	<	Action<Map.Entry<K,V>> action) {
5156	<	if (action == null) throw new NullPointerException();
5157	<	return new ForEachEntryTask<K,V>(map, null, -1, null, action);
5158	<	}
5159	<
5160	<	/**
5161	<	* Returns a task that when invoked, perform the given action
5162	<	* for each non-null transformation of each entry.
5163	<	*
5164	<	* @param map the map
5165	<	* @param transformer a function returning the transformation
5166	<	* for an element, or null if there is no transformation (in
5167	<	* which case the action is not applied)
5168	<	* @param action the action
5169	<	*/
5170	<	public static <K,V,U> ForkJoinTask<Void> forEachEntry
5171	<	(ConcurrentHashMap<K,V> map,
5172	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5173	<	Action<U> action) {
5174	<	if (transformer == null || action == null)
5175	<	throw new NullPointerException();
5176	<	return new ForEachTransformedEntryTask<K,V,U>
5177	<	(map, null, -1, null, transformer, action);
5178	<	}
5179	<
5180	<	/**
5181	<	* Returns a task that when invoked, returns a non-null result
5182	<	* from applying the given search function on each entry, or
5183	<	* null if none.  Upon success, further element processing is
5184	<	* suppressed and the results of any other parallel
5185	<	* invocations of the search function are ignored.
5186	<	*
5187	<	* @param map the map
5188	<	* @param searchFunction a function returning a non-null
5189	<	* result on success, else null
5190	<	* @return the task
5191	<	*/
5192	<	public static <K,V,U> ForkJoinTask<U> searchEntries
5193	<	(ConcurrentHashMap<K,V> map,
5194	<	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
5195	<	if (searchFunction == null) throw new NullPointerException();
5196	<	return new SearchEntriesTask<K,V,U>
5197	<	(map, null, -1, null, searchFunction,
5198	<	new AtomicReference<U>());
5199	<	}
5200	<
5201	<	/**
5202	<	* Returns a task that when invoked, returns the result of
5203	<	* accumulating all entries using the given reducer to combine
5204	<	* values, or null if none.
5205	<	*
5206	<	* @param map the map
5207	<	* @param reducer a commutative associative combining function
5208	<	* @return the task
5209	<	*/
5210	<	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
5211	<	(ConcurrentHashMap<K,V> map,
5212	<	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5213	<	if (reducer == null) throw new NullPointerException();
5214	<	return new ReduceEntriesTask<K,V>
5215	<	(map, null, -1, null, reducer);
5216	<	}
5217	<
5218	<	/**
5219	<	* Returns a task that when invoked, returns the result of
5220	<	* accumulating the given transformation of all entries using the
5221	<	* given reducer to combine values, or null if none.
5222	<	*
5223	<	* @param map the map
5224	<	* @param transformer a function returning the transformation
5225	<	* for an element, or null if there is no transformation (in
5226	<	* which case it is not combined).
5227	<	* @param reducer a commutative associative combining function
5228	<	* @return the task
5229	<	*/
5230	<	public static <K,V,U> ForkJoinTask<U> reduceEntries
5231	<	(ConcurrentHashMap<K,V> map,
5232	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5233	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5234	<	if (transformer == null || reducer == null)
5235	<	throw new NullPointerException();
5236	<	return new MapReduceEntriesTask<K,V,U>
5237	<	(map, null, -1, null, transformer, reducer);
5238	<	}
5239	<
5240	<	/**
5241	<	* Returns a task that when invoked, returns the result of
5242	<	* accumulating the given transformation of all entries using the
5243	<	* given reducer to combine values, and the given basis as an
5244	<	* identity value.
5245	<	*
5246	<	* @param map the map
5247	<	* @param transformer a function returning the transformation
5248	<	* for an element
5249	<	* @param basis the identity (initial default value) for the reduction
5250	<	* @param reducer a commutative associative combining function
5251	<	* @return the task
5252	<	*/
5253	<	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
5254	<	(ConcurrentHashMap<K,V> map,
5255	<	ObjectToDouble<Map.Entry<K,V>> transformer,
5256	<	double basis,
5257	<	DoubleByDoubleToDouble reducer) {
5258	<	if (transformer == null || reducer == null)
5259	<	throw new NullPointerException();
5260	<	return new MapReduceEntriesToDoubleTask<K,V>
5261	<	(map, null, -1, null, transformer, basis, reducer);
5262	<	}
5263	<
5264	<	/**
5265	<	* Returns a task that when invoked, returns the result of
5266	<	* accumulating the given transformation of all entries using the
5267	<	* given reducer to combine values, and the given basis as an
5268	<	* identity value.
5269	<	*
5270	<	* @param map the map
5271	<	* @param transformer a function returning the transformation
5272	<	* for an element
5273	<	* @param basis the identity (initial default value) for the reduction
5274	<	* @param reducer a commutative associative combining function
5275	<	* @return the task
5276	<	*/
5277	<	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
5278	<	(ConcurrentHashMap<K,V> map,
5279	<	ObjectToLong<Map.Entry<K,V>> transformer,
5280	<	long basis,
5281	<	LongByLongToLong reducer) {
5282	<	if (transformer == null || reducer == null)
5283	<	throw new NullPointerException();
5284	<	return new MapReduceEntriesToLongTask<K,V>
5285	<	(map, null, -1, null, transformer, basis, reducer);
4831	>	Node<K,V>[] t;
4832	>	if ((t = map.table) != null) {
4833	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4834	>	for (Node<K,V> p; (p = it.advance()) != null; )
4835	>	action.accept(new MapEntry<K,V>(p.key, p.val, map));
4836	>	}
4837		}
4838
5288	–	/**
5289	–	* Returns a task that when invoked, returns the result of
5290	–	* accumulating the given transformation of all entries using the
5291	–	* given reducer to combine values, and the given basis as an
5292	–	* identity value.
5293	–	*
5294	–	* @param map the map
5295	–	* @param transformer a function returning the transformation
5296	–	* for an element
5297	–	* @param basis the identity (initial default value) for the reduction
5298	–	* @param reducer a commutative associative combining function
5299	–	* @return the task
5300	–	*/
5301	–	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
5302	–	(ConcurrentHashMap<K,V> map,
5303	–	ObjectToInt<Map.Entry<K,V>> transformer,
5304	–	int basis,
5305	–	IntByIntToInt reducer) {
5306	–	if (transformer == null || reducer == null)
5307	–	throw new NullPointerException();
5308	–	return new MapReduceEntriesToIntTask<K,V>
5309	–	(map, null, -1, null, transformer, basis, reducer);
5310	–	}
4839		}
4840
4841		// -------------------------------------------------------
4842
4843		/**
4844	<	* Base for FJ tasks for bulk operations. This adds a variant of
4845	<	* CountedCompleters and some split and merge bookkeeping to
4846	<	* iterator functionality. The forEach and reduce methods are
4847	<	* similar to those illustrated in CountedCompleter documentation,
4848	<	* except that bottom-up reduction completions perform them within
4849	<	* their compute methods. The search methods are like forEach
4850	<	* except they continually poll for success and exit early.  Also,
4851	<	* exceptions are handled in a simpler manner, by just trying to
4852	<	* complete root task exceptionally.
4853	<	*/
4854	<	@SuppressWarnings("serial") static abstract class BulkTask<K,V,R> extends Traverser<K,V,R> {
4855	<	final BulkTask<K,V,?> parent;  // completion target
4856	<	int batch;                     // split control; -1 for unknown
4857	<	int pending;                   // completion control
4858	<
4859	<	BulkTask(ConcurrentHashMap<K,V> map, BulkTask<K,V,?> parent,
4860	<	int batch) {
4861	<	super(map);
4862	<	this.parent = parent;
4863	<	this.batch = batch;
4864	<	if (parent != null && map != null) { // split parent
4865	<	Node[] t;
4866	<	if ((t = parent.tab) == null &&
4867	<	(t = parent.tab = map.table) != null)
4868	<	parent.baseLimit = parent.baseSize = t.length;
5341	<	this.tab = t;
5342	<	this.baseSize = parent.baseSize;
5343	<	int hi = this.baseLimit = parent.baseLimit;
5344	<	parent.baseLimit = this.index = this.baseIndex =
5345	<	(hi + parent.baseIndex + 1) >>> 1;
4844	>	* Base class for bulk tasks. Repeats some fields and code from
4845	>	* class Traverser, because we need to subclass CountedCompleter.
4846	>	*/
4847	>	@SuppressWarnings("serial")
4848	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4849	>	Node<K,V>[] tab;        // same as Traverser
4850	>	Node<K,V> next;
4851	>	TableStack<K,V> stack, spare;
4852	>	int index;
4853	>	int baseIndex;
4854	>	int baseLimit;
4855	>	final int baseSize;
4856	>	int batch;              // split control
4857	>
4858	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4859	>	super(par);
4860	>	this.batch = b;
4861	>	this.index = this.baseIndex = i;
4862	>	if ((this.tab = t) == null)
4863	>	this.baseSize = this.baseLimit = 0;
4864	>	else if (par == null)
4865	>	this.baseSize = this.baseLimit = t.length;
4866	>	else {
4867	>	this.baseLimit = f;
4868	>	this.baseSize = par.baseSize;
4869		}
4870		}
4871
4872		/**
4873	<	* Forces root task to complete.
5351	<	* @param ex if null, complete normally, else exceptionally
5352	<	* @return false to simplify use
4873	>	* Same as Traverser version.
4874		*/
4875	<	final boolean tryCompleteComputation(Throwable ex) {
4876	<	for (BulkTask<K,V,?> a = this;;) {
4877	<	BulkTask<K,V,?> p = a.parent;
4878	<	if (p == null) {
4879	<	if (ex != null)
4880	<	a.completeExceptionally(ex);
4875	>	final Node<K,V> advance() {
4876	>	Node<K,V> e;
4877	>	if ((e = next) != null)
4878	>	e = e.next;
4879	>	for (;;) {
4880	>	Node<K,V>[] t; int i, n;
4881	>	if (e != null)
4882	>	return next = e;
4883	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4884	>	(n = t.length) <= (i = index) || i < 0)
4885	>	return next = null;
4886	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
4887	>	if (e instanceof ForwardingNode) {
4888	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4889	>	e = null;
4890	>	pushState(t, i, n);
4891	>	continue;
4892	>	}
4893	>	else if (e instanceof TreeBin)
4894	>	e = ((TreeBin<K,V>)e).first;
4895		else
4896	<	a.quietlyComplete();
5362	<	return false;
5363	<	}
5364	<	a = p;
5365	<	}
5366	<	}
5367	<
5368	<	/**
5369	<	* Version of tryCompleteComputation for function screening checks
5370	<	*/
5371	<	final boolean abortOnNullFunction() {
5372	<	return tryCompleteComputation(new Error("Unexpected null function"));
5373	<	}
5374	<
5375	<	// utilities
5376	<
5377	<	/** CompareAndSet pending count */
5378	<	final boolean casPending(int cmp, int val) {
5379	<	return U.compareAndSwapInt(this, PENDING, cmp, val);
5380	<	}
5381	<
5382	<	/**
5383	<	* Returns approx exp2 of the number of times (minus one) to
5384	<	* split task by two before executing leaf action. This value
5385	<	* is faster to compute and more convenient to use as a guide
5386	<	* to splitting than is the depth, since it is used while
5387	<	* dividing by two anyway.
5388	<	*/
5389	<	final int batch() {
5390	<	ConcurrentHashMap<K, V> m; int b; Node[] t;  ForkJoinPool pool;
5391	<	if ((b = batch) < 0 && (m = map) != null) { // force initialization
5392	<	if ((t = tab) == null && (t = tab = m.table) != null)
5393	<	baseLimit = baseSize = t.length;
5394	<	if (t != null) {
5395	<	long n = m.counter.sum();
5396	<	int par = ((pool = getPool()) == null) ?
5397	<	ForkJoinPool.getCommonPoolParallelism() :
5398	<	pool.getParallelism();
5399	<	int sp = par << 3; // slack of 8
5400	<	b = batch = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
4896	>	e = null;
4897		}
4898	+	if (stack != null)
4899	+	recoverState(n);
4900	+	else if ((index = i + baseSize) >= n)
4901	+	index = ++baseIndex;
4902		}
5403	–	return b;
4903		}
4904
4905	<	/**
4906	<	* Returns exportable snapshot entry.
4907	<	*/
4908	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
4909	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
4910	<	}
4911	<
4912	<	// Unsafe mechanics
4913	<	private static final sun.misc.Unsafe U;
4914	<	private static final long PENDING;
4915	<	static {
4916	<	try {
4917	<	U = sun.misc.Unsafe.getUnsafe();
4918	<	PENDING = U.objectFieldOffset
4919	<	(BulkTask.class.getDeclaredField("pending"));
4920	<	} catch (Exception e) {
4921	<	throw new Error(e);
4922	<	}
4923	<	}
4924	<	}
4925	<
4926	<	/**
4927	<	* Base class for non-reductive actions
4928	<	*/
5430	<	@SuppressWarnings("serial") static abstract class BulkAction<K,V,R> extends BulkTask<K,V,R> {
5431	<	BulkAction<K,V,?> nextTask;
5432	<	BulkAction(ConcurrentHashMap<K,V> map, BulkTask<K,V,?> parent,
5433	<	int batch, BulkAction<K,V,?> nextTask) {
5434	<	super(map, parent, batch);
5435	<	this.nextTask = nextTask;
5436	<	}
5437	<
5438	<	/**
5439	<	* Try to complete task and upward parents. Upon hitting
5440	<	* non-completed parent, if a non-FJ task, try to help out the
5441	<	* computation.
5442	<	*/
5443	<	final void tryComplete(BulkAction<K,V,?> subtasks) {
5444	<	BulkTask<K,V,?> a = this, s = a;
5445	<	for (int c;;) {
5446	<	if ((c = a.pending) == 0) {
5447	<	if ((a = (s = a).parent) == null) {
5448	<	s.quietlyComplete();
5449	<	break;
5450	<	}
5451	<	}
5452	<	else if (a.casPending(c, c - 1)) {
5453	<	if (subtasks != null && !inForkJoinPool()) {
5454	<	while ((s = a.parent) != null)
5455	<	a = s;
5456	<	while (!a.isDone()) {
5457	<	BulkAction<K,V,?> next = subtasks.nextTask;
5458	<	if (subtasks.tryUnfork())
5459	<	subtasks.exec();
5460	<	if ((subtasks = next) == null)
5461	<	break;
5462	<	}
5463	<	}
5464	<	break;
5465	<	}
4905	>	private void pushState(Node<K,V>[] t, int i, int n) {
4906	>	TableStack<K,V> s = spare;
4907	>	if (s != null)
4908	>	spare = s.next;
4909	>	else
4910	>	s = new TableStack<K,V>();
4911	>	s.tab = t;
4912	>	s.length = n;
4913	>	s.index = i;
4914	>	s.next = stack;
4915	>	stack = s;
4916	>	}
4917	>
4918	>	private void recoverState(int n) {
4919	>	TableStack<K,V> s; int len;
4920	>	while ((s = stack) != null && (index += (len = s.length)) >= n) {
4921	>	n = len;
4922	>	index = s.index;
4923	>	tab = s.tab;
4924	>	s.tab = null;
4925	>	TableStack<K,V> next = s.next;
4926	>	s.next = spare; // save for reuse
4927	>	stack = next;
4928	>	spare = s;
4929		}
4930	+	if (s == null && (index += baseSize) >= n)
4931	+	index = ++baseIndex;
4932		}
5468	–
4933		}
4934
4935		/*
4936		* Task classes. Coded in a regular but ugly format/style to
4937		* simplify checks that each variant differs in the right way from
4938	<	* others.
4939	<	*/
4940	<
4941	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4942	<	extends BulkAction<K,V,Void> {
4943	<	final Action<K> action;
4938	>	* others. The null screenings exist because compilers cannot tell
4939	>	* that we've already null-checked task arguments, so we force
4940	>	* simplest hoisted bypass to help avoid convoluted traps.
4941	>	*/
4942	>	@SuppressWarnings("serial")
4943	>	static final class ForEachKeyTask<K,V>
4944	>	extends BulkTask<K,V,Void> {
4945	>	final Consumer<? super K> action;
4946		ForEachKeyTask
4947	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4948	<	ForEachKeyTask<K,V> nextTask,
4949	<	Action<K> action) {
5484	<	super(m, p, b, nextTask);
4947	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4948	>	Consumer<? super K> action) {
4949	>	super(p, b, i, f, t);
4950		this.action = action;
4951		}
4952	<	@SuppressWarnings("unchecked") public final boolean exec() {
4953	<	final Action<K> action = this.action;
4954	<	if (action == null)
4955	<	return abortOnNullFunction();
4956	<	ForEachKeyTask<K,V> subtasks = null;
4957	<	try {
4958	<	int b = batch(), c;
4959	<	while (b > 1 && baseIndex != baseLimit) {
4960	<	do {} while (!casPending(c = pending, c+1));
4961	<	(subtasks = new ForEachKeyTask<K,V>
4962	<	(map, this, b >>>= 1, subtasks, action)).fork();
4963	<	}
4964	<	while (advance() != null)
5500	<	action.apply((K)nextKey);
5501	<	} catch (Throwable ex) {
5502	<	return tryCompleteComputation(ex);
4952	>	public final void compute() {
4953	>	final Consumer<? super K> action;
4954	>	if ((action = this.action) != null) {
4955	>	for (int i = baseIndex, f, h; batch > 0 &&
4956	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4957	>	addToPendingCount(1);
4958	>	new ForEachKeyTask<K,V>
4959	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4960	>	action).fork();
4961	>	}
4962	>	for (Node<K,V> p; (p = advance()) != null;)
4963	>	action.accept(p.key);
4964	>	propagateCompletion();
4965		}
5504	–	tryComplete(subtasks);
5505	–	return false;
4966		}
4967		}
4968
4969	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4970	<	extends BulkAction<K,V,Void> {
4971	<	final Action<V> action;
4969	>	@SuppressWarnings("serial")
4970	>	static final class ForEachValueTask<K,V>
4971	>	extends BulkTask<K,V,Void> {
4972	>	final Consumer<? super V> action;
4973		ForEachValueTask
4974	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4975	<	ForEachValueTask<K,V> nextTask,
4976	<	Action<V> action) {
5516	<	super(m, p, b, nextTask);
4974	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4975	>	Consumer<? super V> action) {
4976	>	super(p, b, i, f, t);
4977		this.action = action;
4978		}
4979	<	@SuppressWarnings("unchecked") public final boolean exec() {
4980	<	final Action<V> action = this.action;
4981	<	if (action == null)
4982	<	return abortOnNullFunction();
4983	<	ForEachValueTask<K,V> subtasks = null;
4984	<	try {
4985	<	int b = batch(), c;
4986	<	while (b > 1 && baseIndex != baseLimit) {
4987	<	do {} while (!casPending(c = pending, c+1));
4988	<	(subtasks = new ForEachValueTask<K,V>
4989	<	(map, this, b >>>= 1, subtasks, action)).fork();
4990	<	}
4991	<	Object v;
5532	<	while ((v = advance()) != null)
5533	<	action.apply((V)v);
5534	<	} catch (Throwable ex) {
5535	<	return tryCompleteComputation(ex);
4979	>	public final void compute() {
4980	>	final Consumer<? super V> action;
4981	>	if ((action = this.action) != null) {
4982	>	for (int i = baseIndex, f, h; batch > 0 &&
4983	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4984	>	addToPendingCount(1);
4985	>	new ForEachValueTask<K,V>
4986	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4987	>	action).fork();
4988	>	}
4989	>	for (Node<K,V> p; (p = advance()) != null;)
4990	>	action.accept(p.val);
4991	>	propagateCompletion();
4992		}
5537	–	tryComplete(subtasks);
5538	–	return false;
4993		}
4994		}
4995
4996	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4997	<	extends BulkAction<K,V,Void> {
4998	<	final Action<Entry<K,V>> action;
4996	>	@SuppressWarnings("serial")
4997	>	static final class ForEachEntryTask<K,V>
4998	>	extends BulkTask<K,V,Void> {
4999	>	final Consumer<? super Entry<K,V>> action;
5000		ForEachEntryTask
5001	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5002	<	ForEachEntryTask<K,V> nextTask,
5003	<	Action<Entry<K,V>> action) {
5549	<	super(m, p, b, nextTask);
5001	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5002	>	Consumer<? super Entry<K,V>> action) {
5003	>	super(p, b, i, f, t);
5004		this.action = action;
5005		}
5006	<	@SuppressWarnings("unchecked") public final boolean exec() {
5007	<	final Action<Entry<K,V>> action = this.action;
5008	<	if (action == null)
5009	<	return abortOnNullFunction();
5010	<	ForEachEntryTask<K,V> subtasks = null;
5011	<	try {
5012	<	int b = batch(), c;
5013	<	while (b > 1 && baseIndex != baseLimit) {
5014	<	do {} while (!casPending(c = pending, c+1));
5015	<	(subtasks = new ForEachEntryTask<K,V>
5016	<	(map, this, b >>>= 1, subtasks, action)).fork();
5017	<	}
5018	<	Object v;
5565	<	while ((v = advance()) != null)
5566	<	action.apply(entryFor((K)nextKey, (V)v));
5567	<	} catch (Throwable ex) {
5568	<	return tryCompleteComputation(ex);
5006	>	public final void compute() {
5007	>	final Consumer<? super Entry<K,V>> action;
5008	>	if ((action = this.action) != null) {
5009	>	for (int i = baseIndex, f, h; batch > 0 &&
5010	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5011	>	addToPendingCount(1);
5012	>	new ForEachEntryTask<K,V>
5013	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5014	>	action).fork();
5015	>	}
5016	>	for (Node<K,V> p; (p = advance()) != null; )
5017	>	action.accept(p);
5018	>	propagateCompletion();
5019		}
5570	–	tryComplete(subtasks);
5571	–	return false;
5020		}
5021		}
5022
5023	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
5024	<	extends BulkAction<K,V,Void> {
5025	<	final BiAction<K,V> action;
5023	>	@SuppressWarnings("serial")
5024	>	static final class ForEachMappingTask<K,V>
5025	>	extends BulkTask<K,V,Void> {
5026	>	final BiConsumer<? super K, ? super V> action;
5027		ForEachMappingTask
5028	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5029	<	ForEachMappingTask<K,V> nextTask,
5030	<	BiAction<K,V> action) {
5582	<	super(m, p, b, nextTask);
5028	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5029	>	BiConsumer<? super K,? super V> action) {
5030	>	super(p, b, i, f, t);
5031		this.action = action;
5032		}
5033	<	@SuppressWarnings("unchecked") public final boolean exec() {
5034	<	final BiAction<K,V> action = this.action;
5035	<	if (action == null)
5036	<	return abortOnNullFunction();
5037	<	ForEachMappingTask<K,V> subtasks = null;
5038	<	try {
5039	<	int b = batch(), c;
5040	<	while (b > 1 && baseIndex != baseLimit) {
5041	<	do {} while (!casPending(c = pending, c+1));
5042	<	(subtasks = new ForEachMappingTask<K,V>
5043	<	(map, this, b >>>= 1, subtasks, action)).fork();
5044	<	}
5045	<	Object v;
5598	<	while ((v = advance()) != null)
5599	<	action.apply((K)nextKey, (V)v);
5600	<	} catch (Throwable ex) {
5601	<	return tryCompleteComputation(ex);
5033	>	public final void compute() {
5034	>	final BiConsumer<? super K, ? super V> action;
5035	>	if ((action = this.action) != null) {
5036	>	for (int i = baseIndex, f, h; batch > 0 &&
5037	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5038	>	addToPendingCount(1);
5039	>	new ForEachMappingTask<K,V>
5040	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5041	>	action).fork();
5042	>	}
5043	>	for (Node<K,V> p; (p = advance()) != null; )
5044	>	action.accept(p.key, p.val);
5045	>	propagateCompletion();
5046		}
5603	–	tryComplete(subtasks);
5604	–	return false;
5047		}
5048		}
5049
5050	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
5051	<	extends BulkAction<K,V,Void> {
5052	<	final Fun<? super K, ? extends U> transformer;
5053	<	final Action<U> action;
5050	>	@SuppressWarnings("serial")
5051	>	static final class ForEachTransformedKeyTask<K,V,U>
5052	>	extends BulkTask<K,V,Void> {
5053	>	final Function<? super K, ? extends U> transformer;
5054	>	final Consumer<? super U> action;
5055		ForEachTransformedKeyTask
5056	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5057	<	ForEachTransformedKeyTask<K,V,U> nextTask,
5058	<	Fun<? super K, ? extends U> transformer,
5059	<	Action<U> action) {
5060	<	super(m, p, b, nextTask);
5061	<	this.transformer = transformer;
5062	<	this.action = action;
5063	<
5064	<	}
5065	<	@SuppressWarnings("unchecked") public final boolean exec() {
5066	<	final Fun<? super K, ? extends U> transformer =
5067	<	this.transformer;
5068	<	final Action<U> action = this.action;
5069	<	if (transformer == null || action == null)
5070	<	return abortOnNullFunction();
5071	<	ForEachTransformedKeyTask<K,V,U> subtasks = null;
5072	<	try {
5073	<	int b = batch(), c;
5074	<	while (b > 1 && baseIndex != baseLimit) {
5075	<	do {} while (!casPending(c = pending, c+1));
5076	<	(subtasks = new ForEachTransformedKeyTask<K,V,U>
5077	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5078	<	}
5636	<	U u;
5637	<	while (advance() != null) {
5638	<	if ((u = transformer.apply((K)nextKey)) != null)
5639	<	action.apply(u);
5640	<	}
5641	<	} catch (Throwable ex) {
5642	<	return tryCompleteComputation(ex);
5056	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5057	>	Function<? super K, ? extends U> transformer, Consumer<? super U> action) {
5058	>	super(p, b, i, f, t);
5059	>	this.transformer = transformer; this.action = action;
5060	>	}
5061	>	public final void compute() {
5062	>	final Function<? super K, ? extends U> transformer;
5063	>	final Consumer<? super U> action;
5064	>	if ((transformer = this.transformer) != null &&
5065	>	(action = this.action) != null) {
5066	>	for (int i = baseIndex, f, h; batch > 0 &&
5067	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5068	>	addToPendingCount(1);
5069	>	new ForEachTransformedKeyTask<K,V,U>
5070	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5071	>	transformer, action).fork();
5072	>	}
5073	>	for (Node<K,V> p; (p = advance()) != null; ) {
5074	>	U u;
5075	>	if ((u = transformer.apply(p.key)) != null)
5076	>	action.accept(u);
5077	>	}
5078	>	propagateCompletion();
5079		}
5644	–	tryComplete(subtasks);
5645	–	return false;
5080		}
5081		}
5082
5083	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
5084	<	extends BulkAction<K,V,Void> {
5085	<	final Fun<? super V, ? extends U> transformer;
5086	<	final Action<U> action;
5083	>	@SuppressWarnings("serial")
5084	>	static final class ForEachTransformedValueTask<K,V,U>
5085	>	extends BulkTask<K,V,Void> {
5086	>	final Function<? super V, ? extends U> transformer;
5087	>	final Consumer<? super U> action;
5088		ForEachTransformedValueTask
5089	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5090	<	ForEachTransformedValueTask<K,V,U> nextTask,
5091	<	Fun<? super V, ? extends U> transformer,
5092	<	Action<U> action) {
5093	<	super(m, p, b, nextTask);
5094	<	this.transformer = transformer;
5095	<	this.action = action;
5096	<
5097	<	}
5098	<	@SuppressWarnings("unchecked") public final boolean exec() {
5099	<	final Fun<? super V, ? extends U> transformer =
5100	<	this.transformer;
5101	<	final Action<U> action = this.action;
5102	<	if (transformer == null || action == null)
5103	<	return abortOnNullFunction();
5104	<	ForEachTransformedValueTask<K,V,U> subtasks = null;
5105	<	try {
5106	<	int b = batch(), c;
5107	<	while (b > 1 && baseIndex != baseLimit) {
5108	<	do {} while (!casPending(c = pending, c+1));
5109	<	(subtasks = new ForEachTransformedValueTask<K,V,U>
5110	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5111	<	}
5677	<	Object v; U u;
5678	<	while ((v = advance()) != null) {
5679	<	if ((u = transformer.apply((V)v)) != null)
5680	<	action.apply(u);
5681	<	}
5682	<	} catch (Throwable ex) {
5683	<	return tryCompleteComputation(ex);
5089	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5090	>	Function<? super V, ? extends U> transformer, Consumer<? super U> action) {
5091	>	super(p, b, i, f, t);
5092	>	this.transformer = transformer; this.action = action;
5093	>	}
5094	>	public final void compute() {
5095	>	final Function<? super V, ? extends U> transformer;
5096	>	final Consumer<? super U> action;
5097	>	if ((transformer = this.transformer) != null &&
5098	>	(action = this.action) != null) {
5099	>	for (int i = baseIndex, f, h; batch > 0 &&
5100	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5101	>	addToPendingCount(1);
5102	>	new ForEachTransformedValueTask<K,V,U>
5103	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5104	>	transformer, action).fork();
5105	>	}
5106	>	for (Node<K,V> p; (p = advance()) != null; ) {
5107	>	U u;
5108	>	if ((u = transformer.apply(p.val)) != null)
5109	>	action.accept(u);
5110	>	}
5111	>	propagateCompletion();
5112		}
5685	–	tryComplete(subtasks);
5686	–	return false;
5113		}
5114		}
5115
5116	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
5117	<	extends BulkAction<K,V,Void> {
5118	<	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5119	<	final Action<U> action;
5116	>	@SuppressWarnings("serial")
5117	>	static final class ForEachTransformedEntryTask<K,V,U>
5118	>	extends BulkTask<K,V,Void> {
5119	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
5120	>	final Consumer<? super U> action;
5121		ForEachTransformedEntryTask
5122	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5123	<	ForEachTransformedEntryTask<K,V,U> nextTask,
5124	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5125	<	Action<U> action) {
5126	<	super(m, p, b, nextTask);
5127	<	this.transformer = transformer;
5128	<	this.action = action;
5129	<
5130	<	}
5131	<	@SuppressWarnings("unchecked") public final boolean exec() {
5132	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5133	<	this.transformer;
5134	<	final Action<U> action = this.action;
5135	<	if (transformer == null || action == null)
5136	<	return abortOnNullFunction();
5137	<	ForEachTransformedEntryTask<K,V,U> subtasks = null;
5138	<	try {
5139	<	int b = batch(), c;
5140	<	while (b > 1 && baseIndex != baseLimit) {
5141	<	do {} while (!casPending(c = pending, c+1));
5142	<	(subtasks = new ForEachTransformedEntryTask<K,V,U>
5143	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5144	<	}
5718	<	Object v; U u;
5719	<	while ((v = advance()) != null) {
5720	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5721	<	action.apply(u);
5722	<	}
5723	<	} catch (Throwable ex) {
5724	<	return tryCompleteComputation(ex);
5122	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5123	>	Function<Map.Entry<K,V>, ? extends U> transformer, Consumer<? super U> action) {
5124	>	super(p, b, i, f, t);
5125	>	this.transformer = transformer; this.action = action;
5126	>	}
5127	>	public final void compute() {
5128	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
5129	>	final Consumer<? super U> action;
5130	>	if ((transformer = this.transformer) != null &&
5131	>	(action = this.action) != null) {
5132	>	for (int i = baseIndex, f, h; batch > 0 &&
5133	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5134	>	addToPendingCount(1);
5135	>	new ForEachTransformedEntryTask<K,V,U>
5136	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5137	>	transformer, action).fork();
5138	>	}
5139	>	for (Node<K,V> p; (p = advance()) != null; ) {
5140	>	U u;
5141	>	if ((u = transformer.apply(p)) != null)
5142	>	action.accept(u);
5143	>	}
5144	>	propagateCompletion();
5145		}
5726	–	tryComplete(subtasks);
5727	–	return false;
5146		}
5147		}
5148
5149	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
5150	<	extends BulkAction<K,V,Void> {
5151	<	final BiFun<? super K, ? super V, ? extends U> transformer;
5152	<	final Action<U> action;
5149	>	@SuppressWarnings("serial")
5150	>	static final class ForEachTransformedMappingTask<K,V,U>
5151	>	extends BulkTask<K,V,Void> {
5152	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
5153	>	final Consumer<? super U> action;
5154		ForEachTransformedMappingTask
5155	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5156	<	ForEachTransformedMappingTask<K,V,U> nextTask,
5157	<	BiFun<? super K, ? super V, ? extends U> transformer,
5158	<	Action<U> action) {
5159	<	super(m, p, b, nextTask);
5160	<	this.transformer = transformer;
5161	<	this.action = action;
5162	<
5163	<	}
5164	<	@SuppressWarnings("unchecked") public final boolean exec() {
5165	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5166	<	this.transformer;
5167	<	final Action<U> action = this.action;
5168	<	if (transformer == null || action == null)
5169	<	return abortOnNullFunction();
5170	<	ForEachTransformedMappingTask<K,V,U> subtasks = null;
5171	<	try {
5172	<	int b = batch(), c;
5173	<	while (b > 1 && baseIndex != baseLimit) {
5174	<	do {} while (!casPending(c = pending, c+1));
5175	<	(subtasks = new ForEachTransformedMappingTask<K,V,U>
5176	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5758	<	}
5759	<	Object v; U u;
5760	<	while ((v = advance()) != null) {
5761	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5762	<	action.apply(u);
5155	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5156	>	BiFunction<? super K, ? super V, ? extends U> transformer,
5157	>	Consumer<? super U> action) {
5158	>	super(p, b, i, f, t);
5159	>	this.transformer = transformer; this.action = action;
5160	>	}
5161	>	public final void compute() {
5162	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
5163	>	final Consumer<? super U> action;
5164	>	if ((transformer = this.transformer) != null &&
5165	>	(action = this.action) != null) {
5166	>	for (int i = baseIndex, f, h; batch > 0 &&
5167	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5168	>	addToPendingCount(1);
5169	>	new ForEachTransformedMappingTask<K,V,U>
5170	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5171	>	transformer, action).fork();
5172	>	}
5173	>	for (Node<K,V> p; (p = advance()) != null; ) {
5174	>	U u;
5175	>	if ((u = transformer.apply(p.key, p.val)) != null)
5176	>	action.accept(u);
5177		}
5178	<	} catch (Throwable ex) {
5765	<	return tryCompleteComputation(ex);
5178	>	propagateCompletion();
5179		}
5767	–	tryComplete(subtasks);
5768	–	return false;
5180		}
5181		}
5182
5183	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
5184	<	extends BulkAction<K,V,U> {
5185	<	final Fun<? super K, ? extends U> searchFunction;
5183	>	@SuppressWarnings("serial")
5184	>	static final class SearchKeysTask<K,V,U>
5185	>	extends BulkTask<K,V,U> {
5186	>	final Function<? super K, ? extends U> searchFunction;
5187		final AtomicReference<U> result;
5188		SearchKeysTask
5189	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5190	<	SearchKeysTask<K,V,U> nextTask,
5779	<	Fun<? super K, ? extends U> searchFunction,
5189	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5190	>	Function<? super K, ? extends U> searchFunction,
5191		AtomicReference<U> result) {
5192	<	super(m, p, b, nextTask);
5192	>	super(p, b, i, f, t);
5193		this.searchFunction = searchFunction; this.result = result;
5194		}
5195	<	@SuppressWarnings("unchecked") public final boolean exec() {
5196	<	AtomicReference<U> result = this.result;
5197	<	final Fun<? super K, ? extends U> searchFunction =
5198	<	this.searchFunction;
5199	<	if (searchFunction == null || result == null)
5200	<	return abortOnNullFunction();
5201	<	SearchKeysTask<K,V,U> subtasks = null;
5202	<	try {
5203	<	int b = batch(), c;
5204	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5205	<	do {} while (!casPending(c = pending, c+1));
5206	<	(subtasks = new SearchKeysTask<K,V,U>
5207	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5208	<	}
5209	<	U u;
5210	<	while (result.get() == null && advance() != null) {
5211	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
5195	>	public final U getRawResult() { return result.get(); }
5196	>	public final void compute() {
5197	>	final Function<? super K, ? extends U> searchFunction;
5198	>	final AtomicReference<U> result;
5199	>	if ((searchFunction = this.searchFunction) != null &&
5200	>	(result = this.result) != null) {
5201	>	for (int i = baseIndex, f, h; batch > 0 &&
5202	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5203	>	if (result.get() != null)
5204	>	return;
5205	>	addToPendingCount(1);
5206	>	new SearchKeysTask<K,V,U>
5207	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5208	>	searchFunction, result).fork();
5209	>	}
5210	>	while (result.get() == null) {
5211	>	U u;
5212	>	Node<K,V> p;
5213	>	if ((p = advance()) == null) {
5214	>	propagateCompletion();
5215	>	break;
5216	>	}
5217	>	if ((u = searchFunction.apply(p.key)) != null) {
5218		if (result.compareAndSet(null, u))
5219	<	tryCompleteComputation(null);
5219	>	quietlyCompleteRoot();
5220		break;
5221		}
5222		}
5806	–	} catch (Throwable ex) {
5807	–	return tryCompleteComputation(ex);
5223		}
5809	–	tryComplete(subtasks);
5810	–	return false;
5224		}
5812	–	public final U getRawResult() { return result.get(); }
5225		}
5226
5227	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
5228	<	extends BulkAction<K,V,U> {
5229	<	final Fun<? super V, ? extends U> searchFunction;
5227	>	@SuppressWarnings("serial")
5228	>	static final class SearchValuesTask<K,V,U>
5229	>	extends BulkTask<K,V,U> {
5230	>	final Function<? super V, ? extends U> searchFunction;
5231		final AtomicReference<U> result;
5232		SearchValuesTask
5233	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5234	<	SearchValuesTask<K,V,U> nextTask,
5822	<	Fun<? super V, ? extends U> searchFunction,
5233	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5234	>	Function<? super V, ? extends U> searchFunction,
5235		AtomicReference<U> result) {
5236	<	super(m, p, b, nextTask);
5236	>	super(p, b, i, f, t);
5237		this.searchFunction = searchFunction; this.result = result;
5238		}
5239	<	@SuppressWarnings("unchecked") public final boolean exec() {
5240	<	AtomicReference<U> result = this.result;
5241	<	final Fun<? super V, ? extends U> searchFunction =
5242	<	this.searchFunction;
5243	<	if (searchFunction == null || result == null)
5244	<	return abortOnNullFunction();
5245	<	SearchValuesTask<K,V,U> subtasks = null;
5246	<	try {
5247	<	int b = batch(), c;
5248	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5249	<	do {} while (!casPending(c = pending, c+1));
5250	<	(subtasks = new SearchValuesTask<K,V,U>
5251	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5252	<	}
5253	<	Object v; U u;
5254	<	while (result.get() == null && (v = advance()) != null) {
5255	<	if ((u = searchFunction.apply((V)v)) != null) {
5239	>	public final U getRawResult() { return result.get(); }
5240	>	public final void compute() {
5241	>	final Function<? super V, ? extends U> searchFunction;
5242	>	final AtomicReference<U> result;
5243	>	if ((searchFunction = this.searchFunction) != null &&
5244	>	(result = this.result) != null) {
5245	>	for (int i = baseIndex, f, h; batch > 0 &&
5246	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5247	>	if (result.get() != null)
5248	>	return;
5249	>	addToPendingCount(1);
5250	>	new SearchValuesTask<K,V,U>
5251	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5252	>	searchFunction, result).fork();
5253	>	}
5254	>	while (result.get() == null) {
5255	>	U u;
5256	>	Node<K,V> p;
5257	>	if ((p = advance()) == null) {
5258	>	propagateCompletion();
5259	>	break;
5260	>	}
5261	>	if ((u = searchFunction.apply(p.val)) != null) {
5262		if (result.compareAndSet(null, u))
5263	<	tryCompleteComputation(null);
5263	>	quietlyCompleteRoot();
5264		break;
5265		}
5266		}
5849	–	} catch (Throwable ex) {
5850	–	return tryCompleteComputation(ex);
5267		}
5852	–	tryComplete(subtasks);
5853	–	return false;
5268		}
5855	–	public final U getRawResult() { return result.get(); }
5269		}
5270
5271	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5272	<	extends BulkAction<K,V,U> {
5273	<	final Fun<Entry<K,V>, ? extends U> searchFunction;
5271	>	@SuppressWarnings("serial")
5272	>	static final class SearchEntriesTask<K,V,U>
5273	>	extends BulkTask<K,V,U> {
5274	>	final Function<Entry<K,V>, ? extends U> searchFunction;
5275		final AtomicReference<U> result;
5276		SearchEntriesTask
5277	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5278	<	SearchEntriesTask<K,V,U> nextTask,
5865	<	Fun<Entry<K,V>, ? extends U> searchFunction,
5277	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5278	>	Function<Entry<K,V>, ? extends U> searchFunction,
5279		AtomicReference<U> result) {
5280	<	super(m, p, b, nextTask);
5280	>	super(p, b, i, f, t);
5281		this.searchFunction = searchFunction; this.result = result;
5282		}
5283	<	@SuppressWarnings("unchecked") public final boolean exec() {
5284	<	AtomicReference<U> result = this.result;
5285	<	final Fun<Entry<K,V>, ? extends U> searchFunction =
5286	<	this.searchFunction;
5287	<	if (searchFunction == null || result == null)
5288	<	return abortOnNullFunction();
5289	<	SearchEntriesTask<K,V,U> subtasks = null;
5290	<	try {
5291	<	int b = batch(), c;
5292	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5293	<	do {} while (!casPending(c = pending, c+1));
5294	<	(subtasks = new SearchEntriesTask<K,V,U>
5295	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5296	<	}
5297	<	Object v; U u;
5298	<	while (result.get() == null && (v = advance()) != null) {
5299	<	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
5300	<	if (result.compareAndSet(null, u))
5301	<	tryCompleteComputation(null);
5283	>	public final U getRawResult() { return result.get(); }
5284	>	public final void compute() {
5285	>	final Function<Entry<K,V>, ? extends U> searchFunction;
5286	>	final AtomicReference<U> result;
5287	>	if ((searchFunction = this.searchFunction) != null &&
5288	>	(result = this.result) != null) {
5289	>	for (int i = baseIndex, f, h; batch > 0 &&
5290	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5291	>	if (result.get() != null)
5292	>	return;
5293	>	addToPendingCount(1);
5294	>	new SearchEntriesTask<K,V,U>
5295	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5296	>	searchFunction, result).fork();
5297	>	}
5298	>	while (result.get() == null) {
5299	>	U u;
5300	>	Node<K,V> p;
5301	>	if ((p = advance()) == null) {
5302	>	propagateCompletion();
5303		break;
5304		}
5305	+	if ((u = searchFunction.apply(p)) != null) {
5306	+	if (result.compareAndSet(null, u))
5307	+	quietlyCompleteRoot();
5308	+	return;
5309	+	}
5310		}
5892	–	} catch (Throwable ex) {
5893	–	return tryCompleteComputation(ex);
5311		}
5895	–	tryComplete(subtasks);
5896	–	return false;
5312		}
5898	–	public final U getRawResult() { return result.get(); }
5313		}
5314
5315	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5316	<	extends BulkAction<K,V,U> {
5317	<	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5315	>	@SuppressWarnings("serial")
5316	>	static final class SearchMappingsTask<K,V,U>
5317	>	extends BulkTask<K,V,U> {
5318	>	final BiFunction<? super K, ? super V, ? extends U> searchFunction;
5319		final AtomicReference<U> result;
5320		SearchMappingsTask
5321	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5322	<	SearchMappingsTask<K,V,U> nextTask,
5908	<	BiFun<? super K, ? super V, ? extends U> searchFunction,
5321	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5322	>	BiFunction<? super K, ? super V, ? extends U> searchFunction,
5323		AtomicReference<U> result) {
5324	<	super(m, p, b, nextTask);
5324	>	super(p, b, i, f, t);
5325		this.searchFunction = searchFunction; this.result = result;
5326		}
5327	<	@SuppressWarnings("unchecked") public final boolean exec() {
5328	<	AtomicReference<U> result = this.result;
5329	<	final BiFun<? super K, ? super V, ? extends U> searchFunction =
5330	<	this.searchFunction;
5331	<	if (searchFunction == null || result == null)
5332	<	return abortOnNullFunction();
5333	<	SearchMappingsTask<K,V,U> subtasks = null;
5334	<	try {
5335	<	int b = batch(), c;
5336	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5337	<	do {} while (!casPending(c = pending, c+1));
5338	<	(subtasks = new SearchMappingsTask<K,V,U>
5339	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5340	<	}
5341	<	Object v; U u;
5342	<	while (result.get() == null && (v = advance()) != null) {
5343	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5327	>	public final U getRawResult() { return result.get(); }
5328	>	public final void compute() {
5329	>	final BiFunction<? super K, ? super V, ? extends U> searchFunction;
5330	>	final AtomicReference<U> result;
5331	>	if ((searchFunction = this.searchFunction) != null &&
5332	>	(result = this.result) != null) {
5333	>	for (int i = baseIndex, f, h; batch > 0 &&
5334	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5335	>	if (result.get() != null)
5336	>	return;
5337	>	addToPendingCount(1);
5338	>	new SearchMappingsTask<K,V,U>
5339	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5340	>	searchFunction, result).fork();
5341	>	}
5342	>	while (result.get() == null) {
5343	>	U u;
5344	>	Node<K,V> p;
5345	>	if ((p = advance()) == null) {
5346	>	propagateCompletion();
5347	>	break;
5348	>	}
5349	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5350		if (result.compareAndSet(null, u))
5351	<	tryCompleteComputation(null);
5351	>	quietlyCompleteRoot();
5352		break;
5353		}
5354		}
5935	–	} catch (Throwable ex) {
5936	–	return tryCompleteComputation(ex);
5355		}
5938	–	tryComplete(subtasks);
5939	–	return false;
5356		}
5941	–	public final U getRawResult() { return result.get(); }
5357		}
5358
5359	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5359	>	@SuppressWarnings("serial")
5360	>	static final class ReduceKeysTask<K,V>
5361		extends BulkTask<K,V,K> {
5362	<	final BiFun<? super K, ? super K, ? extends K> reducer;
5362	>	final BiFunction<? super K, ? super K, ? extends K> reducer;
5363		K result;
5364		ReduceKeysTask<K,V> rights, nextRight;
5365		ReduceKeysTask
5366	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5366	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5367		ReduceKeysTask<K,V> nextRight,
5368	<	BiFun<? super K, ? super K, ? extends K> reducer) {
5369	<	super(m, p, b); this.nextRight = nextRight;
5368	>	BiFunction<? super K, ? super K, ? extends K> reducer) {
5369	>	super(p, b, i, f, t); this.nextRight = nextRight;
5370		this.reducer = reducer;
5371		}
5372	<	@SuppressWarnings("unchecked") public final boolean exec() {
5373	<	final BiFun<? super K, ? super K, ? extends K> reducer =
5374	<	this.reducer;
5375	<	if (reducer == null)
5376	<	return abortOnNullFunction();
5377	<	try {
5378	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5963	<	do {} while (!casPending(c = pending, c+1));
5372	>	public final K getRawResult() { return result; }
5373	>	public final void compute() {
5374	>	final BiFunction<? super K, ? super K, ? extends K> reducer;
5375	>	if ((reducer = this.reducer) != null) {
5376	>	for (int i = baseIndex, f, h; batch > 0 &&
5377	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5378	>	addToPendingCount(1);
5379		(rights = new ReduceKeysTask<K,V>
5380	<	(map, this, b >>>= 1, rights, reducer)).fork();
5380	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5381	>	rights, reducer)).fork();
5382		}
5383		K r = null;
5384	<	while (advance() != null) {
5385	<	K u = (K)nextKey;
5386	<	r = (r == null) ? u : reducer.apply(r, u);
5384	>	for (Node<K,V> p; (p = advance()) != null; ) {
5385	>	K u = p.key;
5386	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5387		}
5388		result = r;
5389	<	for (ReduceKeysTask<K,V> t = this, s;;) {
5390	<	int c; BulkTask<K,V,?> par; K tr, sr;
5391	<	if ((c = t.pending) == 0) {
5392	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5393	<	if ((sr = s.result) != null)
5394	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5395	<	}
5396	<	if ((par = t.parent) == null ||
5397	<	!(par instanceof ReduceKeysTask)) {
5398	<	t.quietlyComplete();
5399	<	break;
5400	<	}
5985	<	t = (ReduceKeysTask<K,V>)par;
5389	>	CountedCompleter<?> c;
5390	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5391	>	@SuppressWarnings("unchecked")
5392	>	ReduceKeysTask<K,V>
5393	>	t = (ReduceKeysTask<K,V>)c,
5394	>	s = t.rights;
5395	>	while (s != null) {
5396	>	K tr, sr;
5397	>	if ((sr = s.result) != null)
5398	>	t.result = (((tr = t.result) == null) ? sr :
5399	>	reducer.apply(tr, sr));
5400	>	s = t.rights = s.nextRight;
5401		}
5987	–	else if (t.casPending(c, c - 1))
5988	–	break;
5402		}
5990	–	} catch (Throwable ex) {
5991	–	return tryCompleteComputation(ex);
5992	–	}
5993	–	ReduceKeysTask<K,V> s = rights;
5994	–	if (s != null && !inForkJoinPool()) {
5995	–	do  {
5996	–	if (s.tryUnfork())
5997	–	s.exec();
5998	–	} while ((s = s.nextRight) != null);
5403		}
6000	–	return false;
5404		}
6002	–	public final K getRawResult() { return result; }
5405		}
5406
5407	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5407	>	@SuppressWarnings("serial")
5408	>	static final class ReduceValuesTask<K,V>
5409		extends BulkTask<K,V,V> {
5410	<	final BiFun<? super V, ? super V, ? extends V> reducer;
5410	>	final BiFunction<? super V, ? super V, ? extends V> reducer;
5411		V result;
5412		ReduceValuesTask<K,V> rights, nextRight;
5413		ReduceValuesTask
5414	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5414	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5415		ReduceValuesTask<K,V> nextRight,
5416	<	BiFun<? super V, ? super V, ? extends V> reducer) {
5417	<	super(m, p, b); this.nextRight = nextRight;
5416	>	BiFunction<? super V, ? super V, ? extends V> reducer) {
5417	>	super(p, b, i, f, t); this.nextRight = nextRight;
5418		this.reducer = reducer;
5419		}
5420	<	@SuppressWarnings("unchecked") public final boolean exec() {
5421	<	final BiFun<? super V, ? super V, ? extends V> reducer =
5422	<	this.reducer;
5423	<	if (reducer == null)
5424	<	return abortOnNullFunction();
5425	<	try {
5426	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6024	<	do {} while (!casPending(c = pending, c+1));
5420	>	public final V getRawResult() { return result; }
5421	>	public final void compute() {
5422	>	final BiFunction<? super V, ? super V, ? extends V> reducer;
5423	>	if ((reducer = this.reducer) != null) {
5424	>	for (int i = baseIndex, f, h; batch > 0 &&
5425	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5426	>	addToPendingCount(1);
5427		(rights = new ReduceValuesTask<K,V>
5428	<	(map, this, b >>>= 1, rights, reducer)).fork();
5428	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5429	>	rights, reducer)).fork();
5430		}
5431		V r = null;
5432	<	Object v;
5433	<	while ((v = advance()) != null) {
5434	<	V u = (V)v;
6032	<	r = (r == null) ? u : reducer.apply(r, u);
5432	>	for (Node<K,V> p; (p = advance()) != null; ) {
5433	>	V v = p.val;
5434	>	r = (r == null) ? v : reducer.apply(r, v);
5435		}
5436		result = r;
5437	<	for (ReduceValuesTask<K,V> t = this, s;;) {
5438	<	int c; BulkTask<K,V,?> par; V tr, sr;
5439	<	if ((c = t.pending) == 0) {
5440	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5441	<	if ((sr = s.result) != null)
5442	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5443	<	}
5444	<	if ((par = t.parent) == null ||
5445	<	!(par instanceof ReduceValuesTask)) {
5446	<	t.quietlyComplete();
5447	<	break;
5448	<	}
6047	<	t = (ReduceValuesTask<K,V>)par;
5437	>	CountedCompleter<?> c;
5438	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5439	>	@SuppressWarnings("unchecked")
5440	>	ReduceValuesTask<K,V>
5441	>	t = (ReduceValuesTask<K,V>)c,
5442	>	s = t.rights;
5443	>	while (s != null) {
5444	>	V tr, sr;
5445	>	if ((sr = s.result) != null)
5446	>	t.result = (((tr = t.result) == null) ? sr :
5447	>	reducer.apply(tr, sr));
5448	>	s = t.rights = s.nextRight;
5449		}
6049	–	else if (t.casPending(c, c - 1))
6050	–	break;
5450		}
6052	–	} catch (Throwable ex) {
6053	–	return tryCompleteComputation(ex);
6054	–	}
6055	–	ReduceValuesTask<K,V> s = rights;
6056	–	if (s != null && !inForkJoinPool()) {
6057	–	do  {
6058	–	if (s.tryUnfork())
6059	–	s.exec();
6060	–	} while ((s = s.nextRight) != null);
5451		}
6062	–	return false;
5452		}
6064	–	public final V getRawResult() { return result; }
5453		}
5454
5455	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5455	>	@SuppressWarnings("serial")
5456	>	static final class ReduceEntriesTask<K,V>
5457		extends BulkTask<K,V,Map.Entry<K,V>> {
5458	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5458	>	final BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5459		Map.Entry<K,V> result;
5460		ReduceEntriesTask<K,V> rights, nextRight;
5461		ReduceEntriesTask
5462	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5462	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5463		ReduceEntriesTask<K,V> nextRight,
5464	<	BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5465	<	super(m, p, b); this.nextRight = nextRight;
5464	>	BiFunction<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5465	>	super(p, b, i, f, t); this.nextRight = nextRight;
5466		this.reducer = reducer;
5467		}
5468	<	@SuppressWarnings("unchecked") public final boolean exec() {
5469	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5470	<	this.reducer;
5471	<	if (reducer == null)
5472	<	return abortOnNullFunction();
5473	<	try {
5474	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6086	<	do {} while (!casPending(c = pending, c+1));
5468	>	public final Map.Entry<K,V> getRawResult() { return result; }
5469	>	public final void compute() {
5470	>	final BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5471	>	if ((reducer = this.reducer) != null) {
5472	>	for (int i = baseIndex, f, h; batch > 0 &&
5473	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5474	>	addToPendingCount(1);
5475		(rights = new ReduceEntriesTask<K,V>
5476	<	(map, this, b >>>= 1, rights, reducer)).fork();
5476	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5477	>	rights, reducer)).fork();
5478		}
5479		Map.Entry<K,V> r = null;
5480	<	Object v;
5481	<	while ((v = advance()) != null) {
6093	<	Map.Entry<K,V> u = entryFor((K)nextKey, (V)v);
6094	<	r = (r == null) ? u : reducer.apply(r, u);
6095	<	}
5480	>	for (Node<K,V> p; (p = advance()) != null; )
5481	>	r = (r == null) ? p : reducer.apply(r, p);
5482		result = r;
5483	<	for (ReduceEntriesTask<K,V> t = this, s;;) {
5484	<	int c; BulkTask<K,V,?> par; Map.Entry<K,V> tr, sr;
5485	<	if ((c = t.pending) == 0) {
5486	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5487	<	if ((sr = s.result) != null)
5488	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5489	<	}
5490	<	if ((par = t.parent) == null ||
5491	<	!(par instanceof ReduceEntriesTask)) {
5492	<	t.quietlyComplete();
5493	<	break;
5494	<	}
6109	<	t = (ReduceEntriesTask<K,V>)par;
5483	>	CountedCompleter<?> c;
5484	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5485	>	@SuppressWarnings("unchecked")
5486	>	ReduceEntriesTask<K,V>
5487	>	t = (ReduceEntriesTask<K,V>)c,
5488	>	s = t.rights;
5489	>	while (s != null) {
5490	>	Map.Entry<K,V> tr, sr;
5491	>	if ((sr = s.result) != null)
5492	>	t.result = (((tr = t.result) == null) ? sr :
5493	>	reducer.apply(tr, sr));
5494	>	s = t.rights = s.nextRight;
5495		}
6111	–	else if (t.casPending(c, c - 1))
6112	–	break;
5496		}
6114	–	} catch (Throwable ex) {
6115	–	return tryCompleteComputation(ex);
6116	–	}
6117	–	ReduceEntriesTask<K,V> s = rights;
6118	–	if (s != null && !inForkJoinPool()) {
6119	–	do  {
6120	–	if (s.tryUnfork())
6121	–	s.exec();
6122	–	} while ((s = s.nextRight) != null);
5497		}
6124	–	return false;
5498		}
6126	–	public final Map.Entry<K,V> getRawResult() { return result; }
5499		}
5500
5501	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5501	>	@SuppressWarnings("serial")
5502	>	static final class MapReduceKeysTask<K,V,U>
5503		extends BulkTask<K,V,U> {
5504	<	final Fun<? super K, ? extends U> transformer;
5505	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5504	>	final Function<? super K, ? extends U> transformer;
5505	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5506		U result;
5507		MapReduceKeysTask<K,V,U> rights, nextRight;
5508		MapReduceKeysTask
5509	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5509	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5510		MapReduceKeysTask<K,V,U> nextRight,
5511	<	Fun<? super K, ? extends U> transformer,
5512	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5513	<	super(m, p, b); this.nextRight = nextRight;
5511	>	Function<? super K, ? extends U> transformer,
5512	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5513	>	super(p, b, i, f, t); this.nextRight = nextRight;
5514		this.transformer = transformer;
5515		this.reducer = reducer;
5516		}
5517	<	@SuppressWarnings("unchecked") public final boolean exec() {
5518	<	final Fun<? super K, ? extends U> transformer =
5519	<	this.transformer;
5520	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5521	<	this.reducer;
5522	<	if (transformer == null || reducer == null)
5523	<	return abortOnNullFunction();
5524	<	try {
5525	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6153	<	do {} while (!casPending(c = pending, c+1));
5517	>	public final U getRawResult() { return result; }
5518	>	public final void compute() {
5519	>	final Function<? super K, ? extends U> transformer;
5520	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5521	>	if ((transformer = this.transformer) != null &&
5522	>	(reducer = this.reducer) != null) {
5523	>	for (int i = baseIndex, f, h; batch > 0 &&
5524	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5525	>	addToPendingCount(1);
5526		(rights = new MapReduceKeysTask<K,V,U>
5527	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5527	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5528	>	rights, transformer, reducer)).fork();
5529		}
5530	<	U r = null, u;
5531	<	while (advance() != null) {
5532	<	if ((u = transformer.apply((K)nextKey)) != null)
5530	>	U r = null;
5531	>	for (Node<K,V> p; (p = advance()) != null; ) {
5532	>	U u;
5533	>	if ((u = transformer.apply(p.key)) != null)
5534		r = (r == null) ? u : reducer.apply(r, u);
5535		}
5536		result = r;
5537	<	for (MapReduceKeysTask<K,V,U> t = this, s;;) {
5538	<	int c; BulkTask<K,V,?> par; U tr, sr;
5539	<	if ((c = t.pending) == 0) {
5540	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5541	<	if ((sr = s.result) != null)
5542	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5543	<	}
5544	<	if ((par = t.parent) == null ||
5545	<	!(par instanceof MapReduceKeysTask)) {
5546	<	t.quietlyComplete();
5547	<	break;
5548	<	}
6175	<	t = (MapReduceKeysTask<K,V,U>)par;
5537	>	CountedCompleter<?> c;
5538	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5539	>	@SuppressWarnings("unchecked")
5540	>	MapReduceKeysTask<K,V,U>
5541	>	t = (MapReduceKeysTask<K,V,U>)c,
5542	>	s = t.rights;
5543	>	while (s != null) {
5544	>	U tr, sr;
5545	>	if ((sr = s.result) != null)
5546	>	t.result = (((tr = t.result) == null) ? sr :
5547	>	reducer.apply(tr, sr));
5548	>	s = t.rights = s.nextRight;
5549		}
6177	–	else if (t.casPending(c, c - 1))
6178	–	break;
5550		}
6180	–	} catch (Throwable ex) {
6181	–	return tryCompleteComputation(ex);
5551		}
6183	–	MapReduceKeysTask<K,V,U> s = rights;
6184	–	if (s != null && !inForkJoinPool()) {
6185	–	do  {
6186	–	if (s.tryUnfork())
6187	–	s.exec();
6188	–	} while ((s = s.nextRight) != null);
6189	–	}
6190	–	return false;
5552		}
6192	–	public final U getRawResult() { return result; }
5553		}
5554
5555	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5555	>	@SuppressWarnings("serial")
5556	>	static final class MapReduceValuesTask<K,V,U>
5557		extends BulkTask<K,V,U> {
5558	<	final Fun<? super V, ? extends U> transformer;
5559	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5558	>	final Function<? super V, ? extends U> transformer;
5559	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5560		U result;
5561		MapReduceValuesTask<K,V,U> rights, nextRight;
5562		MapReduceValuesTask
5563	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5563	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5564		MapReduceValuesTask<K,V,U> nextRight,
5565	<	Fun<? super V, ? extends U> transformer,
5566	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5567	<	super(m, p, b); this.nextRight = nextRight;
5565	>	Function<? super V, ? extends U> transformer,
5566	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5567	>	super(p, b, i, f, t); this.nextRight = nextRight;
5568		this.transformer = transformer;
5569		this.reducer = reducer;
5570		}
5571	<	@SuppressWarnings("unchecked") public final boolean exec() {
5572	<	final Fun<? super V, ? extends U> transformer =
5573	<	this.transformer;
5574	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5575	<	this.reducer;
5576	<	if (transformer == null || reducer == null)
5577	<	return abortOnNullFunction();
5578	<	try {
5579	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6219	<	do {} while (!casPending(c = pending, c+1));
5571	>	public final U getRawResult() { return result; }
5572	>	public final void compute() {
5573	>	final Function<? super V, ? extends U> transformer;
5574	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5575	>	if ((transformer = this.transformer) != null &&
5576	>	(reducer = this.reducer) != null) {
5577	>	for (int i = baseIndex, f, h; batch > 0 &&
5578	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5579	>	addToPendingCount(1);
5580		(rights = new MapReduceValuesTask<K,V,U>
5581	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5581	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5582	>	rights, transformer, reducer)).fork();
5583		}
5584	<	U r = null, u;
5585	<	Object v;
5586	<	while ((v = advance()) != null) {
5587	<	if ((u = transformer.apply((V)v)) != null)
5584	>	U r = null;
5585	>	for (Node<K,V> p; (p = advance()) != null; ) {
5586	>	U u;
5587	>	if ((u = transformer.apply(p.val)) != null)
5588		r = (r == null) ? u : reducer.apply(r, u);
5589		}
5590		result = r;
5591	<	for (MapReduceValuesTask<K,V,U> t = this, s;;) {
5592	<	int c; BulkTask<K,V,?> par; U tr, sr;
5593	<	if ((c = t.pending) == 0) {
5594	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5595	<	if ((sr = s.result) != null)
5596	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5597	<	}
5598	<	if ((par = t.parent) == null ||
5599	<	!(par instanceof MapReduceValuesTask)) {
5600	<	t.quietlyComplete();
5601	<	break;
5602	<	}
6242	<	t = (MapReduceValuesTask<K,V,U>)par;
5591	>	CountedCompleter<?> c;
5592	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5593	>	@SuppressWarnings("unchecked")
5594	>	MapReduceValuesTask<K,V,U>
5595	>	t = (MapReduceValuesTask<K,V,U>)c,
5596	>	s = t.rights;
5597	>	while (s != null) {
5598	>	U tr, sr;
5599	>	if ((sr = s.result) != null)
5600	>	t.result = (((tr = t.result) == null) ? sr :
5601	>	reducer.apply(tr, sr));
5602	>	s = t.rights = s.nextRight;
5603		}
6244	–	else if (t.casPending(c, c - 1))
6245	–	break;
5604		}
6247	–	} catch (Throwable ex) {
6248	–	return tryCompleteComputation(ex);
6249	–	}
6250	–	MapReduceValuesTask<K,V,U> s = rights;
6251	–	if (s != null && !inForkJoinPool()) {
6252	–	do  {
6253	–	if (s.tryUnfork())
6254	–	s.exec();
6255	–	} while ((s = s.nextRight) != null);
5605		}
6257	–	return false;
5606		}
6259	–	public final U getRawResult() { return result; }
5607		}
5608
5609	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5609	>	@SuppressWarnings("serial")
5610	>	static final class MapReduceEntriesTask<K,V,U>
5611		extends BulkTask<K,V,U> {
5612	<	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5613	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5612	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
5613	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5614		U result;
5615		MapReduceEntriesTask<K,V,U> rights, nextRight;
5616		MapReduceEntriesTask
5617	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5617	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5618		MapReduceEntriesTask<K,V,U> nextRight,
5619	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5620	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5621	<	super(m, p, b); this.nextRight = nextRight;
5619	>	Function<Map.Entry<K,V>, ? extends U> transformer,
5620	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5621	>	super(p, b, i, f, t); this.nextRight = nextRight;
5622		this.transformer = transformer;
5623		this.reducer = reducer;
5624		}
5625	<	@SuppressWarnings("unchecked") public final boolean exec() {
5626	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5627	<	this.transformer;
5628	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5629	<	this.reducer;
5630	<	if (transformer == null || reducer == null)
5631	<	return abortOnNullFunction();
5632	<	try {
5633	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6286	<	do {} while (!casPending(c = pending, c+1));
5625	>	public final U getRawResult() { return result; }
5626	>	public final void compute() {
5627	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
5628	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5629	>	if ((transformer = this.transformer) != null &&
5630	>	(reducer = this.reducer) != null) {
5631	>	for (int i = baseIndex, f, h; batch > 0 &&
5632	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5633	>	addToPendingCount(1);
5634		(rights = new MapReduceEntriesTask<K,V,U>
5635	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5635	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5636	>	rights, transformer, reducer)).fork();
5637		}
5638	<	U r = null, u;
5639	<	Object v;
5640	<	while ((v = advance()) != null) {
5641	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5638	>	U r = null;
5639	>	for (Node<K,V> p; (p = advance()) != null; ) {
5640	>	U u;
5641	>	if ((u = transformer.apply(p)) != null)
5642		r = (r == null) ? u : reducer.apply(r, u);
5643		}
5644		result = r;
5645	<	for (MapReduceEntriesTask<K,V,U> t = this, s;;) {
5646	<	int c; BulkTask<K,V,?> par; U tr, sr;
5647	<	if ((c = t.pending) == 0) {
5648	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5649	<	if ((sr = s.result) != null)
5650	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5651	<	}
5652	<	if ((par = t.parent) == null ||
5653	<	!(par instanceof MapReduceEntriesTask)) {
5654	<	t.quietlyComplete();
5655	<	break;
5656	<	}
6309	<	t = (MapReduceEntriesTask<K,V,U>)par;
5645	>	CountedCompleter<?> c;
5646	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5647	>	@SuppressWarnings("unchecked")
5648	>	MapReduceEntriesTask<K,V,U>
5649	>	t = (MapReduceEntriesTask<K,V,U>)c,
5650	>	s = t.rights;
5651	>	while (s != null) {
5652	>	U tr, sr;
5653	>	if ((sr = s.result) != null)
5654	>	t.result = (((tr = t.result) == null) ? sr :
5655	>	reducer.apply(tr, sr));
5656	>	s = t.rights = s.nextRight;
5657		}
6311	–	else if (t.casPending(c, c - 1))
6312	–	break;
5658		}
6314	–	} catch (Throwable ex) {
6315	–	return tryCompleteComputation(ex);
6316	–	}
6317	–	MapReduceEntriesTask<K,V,U> s = rights;
6318	–	if (s != null && !inForkJoinPool()) {
6319	–	do  {
6320	–	if (s.tryUnfork())
6321	–	s.exec();
6322	–	} while ((s = s.nextRight) != null);
5659		}
6324	–	return false;
5660		}
6326	–	public final U getRawResult() { return result; }
5661		}
5662
5663	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5663	>	@SuppressWarnings("serial")
5664	>	static final class MapReduceMappingsTask<K,V,U>
5665		extends BulkTask<K,V,U> {
5666	<	final BiFun<? super K, ? super V, ? extends U> transformer;
5667	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5666	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
5667	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5668		U result;
5669		MapReduceMappingsTask<K,V,U> rights, nextRight;
5670		MapReduceMappingsTask
5671	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5671	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5672		MapReduceMappingsTask<K,V,U> nextRight,
5673	<	BiFun<? super K, ? super V, ? extends U> transformer,
5674	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5675	<	super(m, p, b); this.nextRight = nextRight;
5673	>	BiFunction<? super K, ? super V, ? extends U> transformer,
5674	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5675	>	super(p, b, i, f, t); this.nextRight = nextRight;
5676		this.transformer = transformer;
5677		this.reducer = reducer;
5678		}
5679	<	@SuppressWarnings("unchecked") public final boolean exec() {
5680	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5681	<	this.transformer;
5682	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5683	<	this.reducer;
5684	<	if (transformer == null || reducer == null)
5685	<	return abortOnNullFunction();
5686	<	try {
5687	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6353	<	do {} while (!casPending(c = pending, c+1));
5679	>	public final U getRawResult() { return result; }
5680	>	public final void compute() {
5681	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
5682	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5683	>	if ((transformer = this.transformer) != null &&
5684	>	(reducer = this.reducer) != null) {
5685	>	for (int i = baseIndex, f, h; batch > 0 &&
5686	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5687	>	addToPendingCount(1);
5688		(rights = new MapReduceMappingsTask<K,V,U>
5689	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5689	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5690	>	rights, transformer, reducer)).fork();
5691		}
5692	<	U r = null, u;
5693	<	Object v;
5694	<	while ((v = advance()) != null) {
5695	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5692	>	U r = null;
5693	>	for (Node<K,V> p; (p = advance()) != null; ) {
5694	>	U u;
5695	>	if ((u = transformer.apply(p.key, p.val)) != null)
5696		r = (r == null) ? u : reducer.apply(r, u);
5697		}
5698		result = r;
5699	<	for (MapReduceMappingsTask<K,V,U> t = this, s;;) {
5700	<	int c; BulkTask<K,V,?> par; U tr, sr;
5701	<	if ((c = t.pending) == 0) {
5702	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5703	<	if ((sr = s.result) != null)
5704	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5705	<	}
5706	<	if ((par = t.parent) == null ||
5707	<	!(par instanceof MapReduceMappingsTask)) {
5708	<	t.quietlyComplete();
5709	<	break;
5710	<	}
6376	<	t = (MapReduceMappingsTask<K,V,U>)par;
5699	>	CountedCompleter<?> c;
5700	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5701	>	@SuppressWarnings("unchecked")
5702	>	MapReduceMappingsTask<K,V,U>
5703	>	t = (MapReduceMappingsTask<K,V,U>)c,
5704	>	s = t.rights;
5705	>	while (s != null) {
5706	>	U tr, sr;
5707	>	if ((sr = s.result) != null)
5708	>	t.result = (((tr = t.result) == null) ? sr :
5709	>	reducer.apply(tr, sr));
5710	>	s = t.rights = s.nextRight;
5711		}
6378	–	else if (t.casPending(c, c - 1))
6379	–	break;
5712		}
6381	–	} catch (Throwable ex) {
6382	–	return tryCompleteComputation(ex);
6383	–	}
6384	–	MapReduceMappingsTask<K,V,U> s = rights;
6385	–	if (s != null && !inForkJoinPool()) {
6386	–	do  {
6387	–	if (s.tryUnfork())
6388	–	s.exec();
6389	–	} while ((s = s.nextRight) != null);
5713		}
6391	–	return false;
5714		}
6393	–	public final U getRawResult() { return result; }
5715		}
5716
5717	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5717	>	@SuppressWarnings("serial")
5718	>	static final class MapReduceKeysToDoubleTask<K,V>
5719		extends BulkTask<K,V,Double> {
5720	<	final ObjectToDouble<? super K> transformer;
5721	<	final DoubleByDoubleToDouble reducer;
5720	>	final ToDoubleFunction<? super K> transformer;
5721	>	final DoubleBinaryOperator reducer;
5722		final double basis;
5723		double result;
5724		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5725		MapReduceKeysToDoubleTask
5726	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5726	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5727		MapReduceKeysToDoubleTask<K,V> nextRight,
5728	<	ObjectToDouble<? super K> transformer,
5728	>	ToDoubleFunction<? super K> transformer,
5729		double basis,
5730	<	DoubleByDoubleToDouble reducer) {
5731	<	super(m, p, b); this.nextRight = nextRight;
5730	>	DoubleBinaryOperator reducer) {
5731	>	super(p, b, i, f, t); this.nextRight = nextRight;
5732		this.transformer = transformer;
5733		this.basis = basis; this.reducer = reducer;
5734		}
5735	<	@SuppressWarnings("unchecked") public final boolean exec() {
5736	<	final ObjectToDouble<? super K> transformer =
5737	<	this.transformer;
5738	<	final DoubleByDoubleToDouble reducer = this.reducer;
5739	<	if (transformer == null || reducer == null)
5740	<	return abortOnNullFunction();
5741	<	try {
5742	<	final double id = this.basis;
5743	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5744	<	do {} while (!casPending(c = pending, c+1));
5735	>	public final Double getRawResult() { return result; }
5736	>	public final void compute() {
5737	>	final ToDoubleFunction<? super K> transformer;
5738	>	final DoubleBinaryOperator reducer;
5739	>	if ((transformer = this.transformer) != null &&
5740	>	(reducer = this.reducer) != null) {
5741	>	double r = this.basis;
5742	>	for (int i = baseIndex, f, h; batch > 0 &&
5743	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5744	>	addToPendingCount(1);
5745		(rights = new MapReduceKeysToDoubleTask<K,V>
5746	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5746	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5747	>	rights, transformer, r, reducer)).fork();
5748		}
5749	<	double r = id;
5750	<	while (advance() != null)
6428	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5749	>	for (Node<K,V> p; (p = advance()) != null; )
5750	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.key));
5751		result = r;
5752	<	for (MapReduceKeysToDoubleTask<K,V> t = this, s;;) {
5753	<	int c; BulkTask<K,V,?> par;
5754	<	if ((c = t.pending) == 0) {
5755	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5756	<	t.result = reducer.apply(t.result, s.result);
5757	<	}
5758	<	if ((par = t.parent) == null ||
5759	<	!(par instanceof MapReduceKeysToDoubleTask)) {
5760	<	t.quietlyComplete();
6439	<	break;
6440	<	}
6441	<	t = (MapReduceKeysToDoubleTask<K,V>)par;
5752	>	CountedCompleter<?> c;
5753	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5754	>	@SuppressWarnings("unchecked")
5755	>	MapReduceKeysToDoubleTask<K,V>
5756	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5757	>	s = t.rights;
5758	>	while (s != null) {
5759	>	t.result = reducer.applyAsDouble(t.result, s.result);
5760	>	s = t.rights = s.nextRight;
5761		}
6443	–	else if (t.casPending(c, c - 1))
6444	–	break;
5762		}
6446	–	} catch (Throwable ex) {
6447	–	return tryCompleteComputation(ex);
5763		}
6449	–	MapReduceKeysToDoubleTask<K,V> s = rights;
6450	–	if (s != null && !inForkJoinPool()) {
6451	–	do  {
6452	–	if (s.tryUnfork())
6453	–	s.exec();
6454	–	} while ((s = s.nextRight) != null);
6455	–	}
6456	–	return false;
5764		}
6458	–	public final Double getRawResult() { return result; }
5765		}
5766
5767	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5767	>	@SuppressWarnings("serial")
5768	>	static final class MapReduceValuesToDoubleTask<K,V>
5769		extends BulkTask<K,V,Double> {
5770	<	final ObjectToDouble<? super V> transformer;
5771	<	final DoubleByDoubleToDouble reducer;
5770	>	final ToDoubleFunction<? super V> transformer;
5771	>	final DoubleBinaryOperator reducer;
5772		final double basis;
5773		double result;
5774		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5775		MapReduceValuesToDoubleTask
5776	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5776	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5777		MapReduceValuesToDoubleTask<K,V> nextRight,
5778	<	ObjectToDouble<? super V> transformer,
5778	>	ToDoubleFunction<? super V> transformer,
5779		double basis,
5780	<	DoubleByDoubleToDouble reducer) {
5781	<	super(m, p, b); this.nextRight = nextRight;
5780	>	DoubleBinaryOperator reducer) {
5781	>	super(p, b, i, f, t); this.nextRight = nextRight;
5782		this.transformer = transformer;
5783		this.basis = basis; this.reducer = reducer;
5784		}
5785	<	@SuppressWarnings("unchecked") public final boolean exec() {
5786	<	final ObjectToDouble<? super V> transformer =
5787	<	this.transformer;
5788	<	final DoubleByDoubleToDouble reducer = this.reducer;
5789	<	if (transformer == null || reducer == null)
5790	<	return abortOnNullFunction();
5791	<	try {
5792	<	final double id = this.basis;
5793	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5794	<	do {} while (!casPending(c = pending, c+1));
5785	>	public final Double getRawResult() { return result; }
5786	>	public final void compute() {
5787	>	final ToDoubleFunction<? super V> transformer;
5788	>	final DoubleBinaryOperator reducer;
5789	>	if ((transformer = this.transformer) != null &&
5790	>	(reducer = this.reducer) != null) {
5791	>	double r = this.basis;
5792	>	for (int i = baseIndex, f, h; batch > 0 &&
5793	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5794	>	addToPendingCount(1);
5795		(rights = new MapReduceValuesToDoubleTask<K,V>
5796	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5796	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5797	>	rights, transformer, r, reducer)).fork();
5798		}
5799	<	double r = id;
5800	<	Object v;
6493	<	while ((v = advance()) != null)
6494	<	r = reducer.apply(r, transformer.apply((V)v));
5799	>	for (Node<K,V> p; (p = advance()) != null; )
5800	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.val));
5801		result = r;
5802	<	for (MapReduceValuesToDoubleTask<K,V> t = this, s;;) {
5803	<	int c; BulkTask<K,V,?> par;
5804	<	if ((c = t.pending) == 0) {
5805	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5806	<	t.result = reducer.apply(t.result, s.result);
5807	<	}
5808	<	if ((par = t.parent) == null ||
5809	<	!(par instanceof MapReduceValuesToDoubleTask)) {
5810	<	t.quietlyComplete();
6505	<	break;
6506	<	}
6507	<	t = (MapReduceValuesToDoubleTask<K,V>)par;
5802	>	CountedCompleter<?> c;
5803	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5804	>	@SuppressWarnings("unchecked")
5805	>	MapReduceValuesToDoubleTask<K,V>
5806	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5807	>	s = t.rights;
5808	>	while (s != null) {
5809	>	t.result = reducer.applyAsDouble(t.result, s.result);
5810	>	s = t.rights = s.nextRight;
5811		}
6509	–	else if (t.casPending(c, c - 1))
6510	–	break;
5812		}
6512	–	} catch (Throwable ex) {
6513	–	return tryCompleteComputation(ex);
6514	–	}
6515	–	MapReduceValuesToDoubleTask<K,V> s = rights;
6516	–	if (s != null && !inForkJoinPool()) {
6517	–	do  {
6518	–	if (s.tryUnfork())
6519	–	s.exec();
6520	–	} while ((s = s.nextRight) != null);
5813		}
6522	–	return false;
5814		}
6524	–	public final Double getRawResult() { return result; }
5815		}
5816
5817	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5817	>	@SuppressWarnings("serial")
5818	>	static final class MapReduceEntriesToDoubleTask<K,V>
5819		extends BulkTask<K,V,Double> {
5820	<	final ObjectToDouble<Map.Entry<K,V>> transformer;
5821	<	final DoubleByDoubleToDouble reducer;
5820	>	final ToDoubleFunction<Map.Entry<K,V>> transformer;
5821	>	final DoubleBinaryOperator reducer;
5822		final double basis;
5823		double result;
5824		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5825		MapReduceEntriesToDoubleTask
5826	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5826	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5827		MapReduceEntriesToDoubleTask<K,V> nextRight,
5828	<	ObjectToDouble<Map.Entry<K,V>> transformer,
5828	>	ToDoubleFunction<Map.Entry<K,V>> transformer,
5829		double basis,
5830	<	DoubleByDoubleToDouble reducer) {
5831	<	super(m, p, b); this.nextRight = nextRight;
5830	>	DoubleBinaryOperator reducer) {
5831	>	super(p, b, i, f, t); this.nextRight = nextRight;
5832		this.transformer = transformer;
5833		this.basis = basis; this.reducer = reducer;
5834		}
5835	<	@SuppressWarnings("unchecked") public final boolean exec() {
5836	<	final ObjectToDouble<Map.Entry<K,V>> transformer =
5837	<	this.transformer;
5838	<	final DoubleByDoubleToDouble reducer = this.reducer;
5839	<	if (transformer == null || reducer == null)
5840	<	return abortOnNullFunction();
5841	<	try {
5842	<	final double id = this.basis;
5843	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5844	<	do {} while (!casPending(c = pending, c+1));
5835	>	public final Double getRawResult() { return result; }
5836	>	public final void compute() {
5837	>	final ToDoubleFunction<Map.Entry<K,V>> transformer;
5838	>	final DoubleBinaryOperator reducer;
5839	>	if ((transformer = this.transformer) != null &&
5840	>	(reducer = this.reducer) != null) {
5841	>	double r = this.basis;
5842	>	for (int i = baseIndex, f, h; batch > 0 &&
5843	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5844	>	addToPendingCount(1);
5845		(rights = new MapReduceEntriesToDoubleTask<K,V>
5846	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5846	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5847	>	rights, transformer, r, reducer)).fork();
5848		}
5849	<	double r = id;
5850	<	Object v;
6559	<	while ((v = advance()) != null)
6560	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5849	>	for (Node<K,V> p; (p = advance()) != null; )
5850	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p));
5851		result = r;
5852	<	for (MapReduceEntriesToDoubleTask<K,V> t = this, s;;) {
5853	<	int c; BulkTask<K,V,?> par;
5854	<	if ((c = t.pending) == 0) {
5855	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5856	<	t.result = reducer.apply(t.result, s.result);
5857	<	}
5858	<	if ((par = t.parent) == null ||
5859	<	!(par instanceof MapReduceEntriesToDoubleTask)) {
5860	<	t.quietlyComplete();
6571	<	break;
6572	<	}
6573	<	t = (MapReduceEntriesToDoubleTask<K,V>)par;
5852	>	CountedCompleter<?> c;
5853	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5854	>	@SuppressWarnings("unchecked")
5855	>	MapReduceEntriesToDoubleTask<K,V>
5856	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5857	>	s = t.rights;
5858	>	while (s != null) {
5859	>	t.result = reducer.applyAsDouble(t.result, s.result);
5860	>	s = t.rights = s.nextRight;
5861		}
6575	–	else if (t.casPending(c, c - 1))
6576	–	break;
5862		}
6578	–	} catch (Throwable ex) {
6579	–	return tryCompleteComputation(ex);
6580	–	}
6581	–	MapReduceEntriesToDoubleTask<K,V> s = rights;
6582	–	if (s != null && !inForkJoinPool()) {
6583	–	do  {
6584	–	if (s.tryUnfork())
6585	–	s.exec();
6586	–	} while ((s = s.nextRight) != null);
5863		}
6588	–	return false;
5864		}
6590	–	public final Double getRawResult() { return result; }
5865		}
5866
5867	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5867	>	@SuppressWarnings("serial")
5868	>	static final class MapReduceMappingsToDoubleTask<K,V>
5869		extends BulkTask<K,V,Double> {
5870	<	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5871	<	final DoubleByDoubleToDouble reducer;
5870	>	final ToDoubleBiFunction<? super K, ? super V> transformer;
5871	>	final DoubleBinaryOperator reducer;
5872		final double basis;
5873		double result;
5874		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5875		MapReduceMappingsToDoubleTask
5876	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5876	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5877		MapReduceMappingsToDoubleTask<K,V> nextRight,
5878	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
5878	>	ToDoubleBiFunction<? super K, ? super V> transformer,
5879		double basis,
5880	<	DoubleByDoubleToDouble reducer) {
5881	<	super(m, p, b); this.nextRight = nextRight;
5880	>	DoubleBinaryOperator reducer) {
5881	>	super(p, b, i, f, t); this.nextRight = nextRight;
5882		this.transformer = transformer;
5883		this.basis = basis; this.reducer = reducer;
5884		}
5885	<	@SuppressWarnings("unchecked") public final boolean exec() {
5886	<	final ObjectByObjectToDouble<? super K, ? super V> transformer =
5887	<	this.transformer;
5888	<	final DoubleByDoubleToDouble reducer = this.reducer;
5889	<	if (transformer == null || reducer == null)
5890	<	return abortOnNullFunction();
5891	<	try {
5892	<	final double id = this.basis;
5893	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5894	<	do {} while (!casPending(c = pending, c+1));
5885	>	public final Double getRawResult() { return result; }
5886	>	public final void compute() {
5887	>	final ToDoubleBiFunction<? super K, ? super V> transformer;
5888	>	final DoubleBinaryOperator reducer;
5889	>	if ((transformer = this.transformer) != null &&
5890	>	(reducer = this.reducer) != null) {
5891	>	double r = this.basis;
5892	>	for (int i = baseIndex, f, h; batch > 0 &&
5893	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5894	>	addToPendingCount(1);
5895		(rights = new MapReduceMappingsToDoubleTask<K,V>
5896	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5896	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5897	>	rights, transformer, r, reducer)).fork();
5898		}
5899	<	double r = id;
5900	<	Object v;
6625	<	while ((v = advance()) != null)
6626	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5899	>	for (Node<K,V> p; (p = advance()) != null; )
5900	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.key, p.val));
5901		result = r;
5902	<	for (MapReduceMappingsToDoubleTask<K,V> t = this, s;;) {
5903	<	int c; BulkTask<K,V,?> par;
5904	<	if ((c = t.pending) == 0) {
5905	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5906	<	t.result = reducer.apply(t.result, s.result);
5907	<	}
5908	<	if ((par = t.parent) == null ||
5909	<	!(par instanceof MapReduceMappingsToDoubleTask)) {
5910	<	t.quietlyComplete();
6637	<	break;
6638	<	}
6639	<	t = (MapReduceMappingsToDoubleTask<K,V>)par;
5902	>	CountedCompleter<?> c;
5903	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5904	>	@SuppressWarnings("unchecked")
5905	>	MapReduceMappingsToDoubleTask<K,V>
5906	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5907	>	s = t.rights;
5908	>	while (s != null) {
5909	>	t.result = reducer.applyAsDouble(t.result, s.result);
5910	>	s = t.rights = s.nextRight;
5911		}
6641	–	else if (t.casPending(c, c - 1))
6642	–	break;
5912		}
6644	–	} catch (Throwable ex) {
6645	–	return tryCompleteComputation(ex);
6646	–	}
6647	–	MapReduceMappingsToDoubleTask<K,V> s = rights;
6648	–	if (s != null && !inForkJoinPool()) {
6649	–	do  {
6650	–	if (s.tryUnfork())
6651	–	s.exec();
6652	–	} while ((s = s.nextRight) != null);
5913		}
6654	–	return false;
5914		}
6656	–	public final Double getRawResult() { return result; }
5915		}
5916
5917	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5917	>	@SuppressWarnings("serial")
5918	>	static final class MapReduceKeysToLongTask<K,V>
5919		extends BulkTask<K,V,Long> {
5920	<	final ObjectToLong<? super K> transformer;
5921	<	final LongByLongToLong reducer;
5920	>	final ToLongFunction<? super K> transformer;
5921	>	final LongBinaryOperator reducer;
5922		final long basis;
5923		long result;
5924		MapReduceKeysToLongTask<K,V> rights, nextRight;
5925		MapReduceKeysToLongTask
5926	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5926	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5927		MapReduceKeysToLongTask<K,V> nextRight,
5928	<	ObjectToLong<? super K> transformer,
5928	>	ToLongFunction<? super K> transformer,
5929		long basis,
5930	<	LongByLongToLong reducer) {
5931	<	super(m, p, b); this.nextRight = nextRight;
5930	>	LongBinaryOperator reducer) {
5931	>	super(p, b, i, f, t); this.nextRight = nextRight;
5932		this.transformer = transformer;
5933		this.basis = basis; this.reducer = reducer;
5934		}
5935	<	@SuppressWarnings("unchecked") public final boolean exec() {
5936	<	final ObjectToLong<? super K> transformer =
5937	<	this.transformer;
5938	<	final LongByLongToLong reducer = this.reducer;
5939	<	if (transformer == null || reducer == null)
5940	<	return abortOnNullFunction();
5941	<	try {
5942	<	final long id = this.basis;
5943	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5944	<	do {} while (!casPending(c = pending, c+1));
5935	>	public final Long getRawResult() { return result; }
5936	>	public final void compute() {
5937	>	final ToLongFunction<? super K> transformer;
5938	>	final LongBinaryOperator reducer;
5939	>	if ((transformer = this.transformer) != null &&
5940	>	(reducer = this.reducer) != null) {
5941	>	long r = this.basis;
5942	>	for (int i = baseIndex, f, h; batch > 0 &&
5943	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5944	>	addToPendingCount(1);
5945		(rights = new MapReduceKeysToLongTask<K,V>
5946	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5946	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5947	>	rights, transformer, r, reducer)).fork();
5948		}
5949	<	long r = id;
5950	<	while (advance() != null)
6691	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5949	>	for (Node<K,V> p; (p = advance()) != null; )
5950	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.key));
5951		result = r;
5952	<	for (MapReduceKeysToLongTask<K,V> t = this, s;;) {
5953	<	int c; BulkTask<K,V,?> par;
5954	<	if ((c = t.pending) == 0) {
5955	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5956	<	t.result = reducer.apply(t.result, s.result);
5957	<	}
5958	<	if ((par = t.parent) == null ||
5959	<	!(par instanceof MapReduceKeysToLongTask)) {
5960	<	t.quietlyComplete();
6702	<	break;
6703	<	}
6704	<	t = (MapReduceKeysToLongTask<K,V>)par;
5952	>	CountedCompleter<?> c;
5953	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5954	>	@SuppressWarnings("unchecked")
5955	>	MapReduceKeysToLongTask<K,V>
5956	>	t = (MapReduceKeysToLongTask<K,V>)c,
5957	>	s = t.rights;
5958	>	while (s != null) {
5959	>	t.result = reducer.applyAsLong(t.result, s.result);
5960	>	s = t.rights = s.nextRight;
5961		}
6706	–	else if (t.casPending(c, c - 1))
6707	–	break;
5962		}
6709	–	} catch (Throwable ex) {
6710	–	return tryCompleteComputation(ex);
5963		}
6712	–	MapReduceKeysToLongTask<K,V> s = rights;
6713	–	if (s != null && !inForkJoinPool()) {
6714	–	do  {
6715	–	if (s.tryUnfork())
6716	–	s.exec();
6717	–	} while ((s = s.nextRight) != null);
6718	–	}
6719	–	return false;
5964		}
6721	–	public final Long getRawResult() { return result; }
5965		}
5966
5967	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5967	>	@SuppressWarnings("serial")
5968	>	static final class MapReduceValuesToLongTask<K,V>
5969		extends BulkTask<K,V,Long> {
5970	<	final ObjectToLong<? super V> transformer;
5971	<	final LongByLongToLong reducer;
5970	>	final ToLongFunction<? super V> transformer;
5971	>	final LongBinaryOperator reducer;
5972		final long basis;
5973		long result;
5974		MapReduceValuesToLongTask<K,V> rights, nextRight;
5975		MapReduceValuesToLongTask
5976	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5976	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5977		MapReduceValuesToLongTask<K,V> nextRight,
5978	<	ObjectToLong<? super V> transformer,
5978	>	ToLongFunction<? super V> transformer,
5979		long basis,
5980	<	LongByLongToLong reducer) {
5981	<	super(m, p, b); this.nextRight = nextRight;
5980	>	LongBinaryOperator reducer) {
5981	>	super(p, b, i, f, t); this.nextRight = nextRight;
5982		this.transformer = transformer;
5983		this.basis = basis; this.reducer = reducer;
5984		}
5985	<	@SuppressWarnings("unchecked") public final boolean exec() {
5986	<	final ObjectToLong<? super V> transformer =
5987	<	this.transformer;
5988	<	final LongByLongToLong reducer = this.reducer;
5989	<	if (transformer == null || reducer == null)
5990	<	return abortOnNullFunction();
5991	<	try {
5992	<	final long id = this.basis;
5993	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5994	<	do {} while (!casPending(c = pending, c+1));
5985	>	public final Long getRawResult() { return result; }
5986	>	public final void compute() {
5987	>	final ToLongFunction<? super V> transformer;
5988	>	final LongBinaryOperator reducer;
5989	>	if ((transformer = this.transformer) != null &&
5990	>	(reducer = this.reducer) != null) {
5991	>	long r = this.basis;
5992	>	for (int i = baseIndex, f, h; batch > 0 &&
5993	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5994	>	addToPendingCount(1);
5995		(rights = new MapReduceValuesToLongTask<K,V>
5996	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5996	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5997	>	rights, transformer, r, reducer)).fork();
5998		}
5999	<	long r = id;
6000	<	Object v;
6756	<	while ((v = advance()) != null)
6757	<	r = reducer.apply(r, transformer.apply((V)v));
5999	>	for (Node<K,V> p; (p = advance()) != null; )
6000	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.val));
6001		result = r;
6002	<	for (MapReduceValuesToLongTask<K,V> t = this, s;;) {
6003	<	int c; BulkTask<K,V,?> par;
6004	<	if ((c = t.pending) == 0) {
6005	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6006	<	t.result = reducer.apply(t.result, s.result);
6007	<	}
6008	<	if ((par = t.parent) == null ||
6009	<	!(par instanceof MapReduceValuesToLongTask)) {
6010	<	t.quietlyComplete();
6768	<	break;
6769	<	}
6770	<	t = (MapReduceValuesToLongTask<K,V>)par;
6002	>	CountedCompleter<?> c;
6003	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6004	>	@SuppressWarnings("unchecked")
6005	>	MapReduceValuesToLongTask<K,V>
6006	>	t = (MapReduceValuesToLongTask<K,V>)c,
6007	>	s = t.rights;
6008	>	while (s != null) {
6009	>	t.result = reducer.applyAsLong(t.result, s.result);
6010	>	s = t.rights = s.nextRight;
6011		}
6772	–	else if (t.casPending(c, c - 1))
6773	–	break;
6012		}
6775	–	} catch (Throwable ex) {
6776	–	return tryCompleteComputation(ex);
6777	–	}
6778	–	MapReduceValuesToLongTask<K,V> s = rights;
6779	–	if (s != null && !inForkJoinPool()) {
6780	–	do  {
6781	–	if (s.tryUnfork())
6782	–	s.exec();
6783	–	} while ((s = s.nextRight) != null);
6013		}
6785	–	return false;
6014		}
6787	–	public final Long getRawResult() { return result; }
6015		}
6016
6017	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
6017	>	@SuppressWarnings("serial")
6018	>	static final class MapReduceEntriesToLongTask<K,V>
6019		extends BulkTask<K,V,Long> {
6020	<	final ObjectToLong<Map.Entry<K,V>> transformer;
6021	<	final LongByLongToLong reducer;
6020	>	final ToLongFunction<Map.Entry<K,V>> transformer;
6021	>	final LongBinaryOperator reducer;
6022		final long basis;
6023		long result;
6024		MapReduceEntriesToLongTask<K,V> rights, nextRight;
6025		MapReduceEntriesToLongTask
6026	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6026	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6027		MapReduceEntriesToLongTask<K,V> nextRight,
6028	<	ObjectToLong<Map.Entry<K,V>> transformer,
6028	>	ToLongFunction<Map.Entry<K,V>> transformer,
6029		long basis,
6030	<	LongByLongToLong reducer) {
6031	<	super(m, p, b); this.nextRight = nextRight;
6030	>	LongBinaryOperator reducer) {
6031	>	super(p, b, i, f, t); this.nextRight = nextRight;
6032		this.transformer = transformer;
6033		this.basis = basis; this.reducer = reducer;
6034		}
6035	<	@SuppressWarnings("unchecked") public final boolean exec() {
6036	<	final ObjectToLong<Map.Entry<K,V>> transformer =
6037	<	this.transformer;
6038	<	final LongByLongToLong reducer = this.reducer;
6039	<	if (transformer == null || reducer == null)
6040	<	return abortOnNullFunction();
6041	<	try {
6042	<	final long id = this.basis;
6043	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6044	<	do {} while (!casPending(c = pending, c+1));
6035	>	public final Long getRawResult() { return result; }
6036	>	public final void compute() {
6037	>	final ToLongFunction<Map.Entry<K,V>> transformer;
6038	>	final LongBinaryOperator reducer;
6039	>	if ((transformer = this.transformer) != null &&
6040	>	(reducer = this.reducer) != null) {
6041	>	long r = this.basis;
6042	>	for (int i = baseIndex, f, h; batch > 0 &&
6043	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6044	>	addToPendingCount(1);
6045		(rights = new MapReduceEntriesToLongTask<K,V>
6046	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6046	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6047	>	rights, transformer, r, reducer)).fork();
6048		}
6049	<	long r = id;
6050	<	Object v;
6822	<	while ((v = advance()) != null)
6823	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
6049	>	for (Node<K,V> p; (p = advance()) != null; )
6050	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p));
6051		result = r;
6052	<	for (MapReduceEntriesToLongTask<K,V> t = this, s;;) {
6053	<	int c; BulkTask<K,V,?> par;
6054	<	if ((c = t.pending) == 0) {
6055	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6056	<	t.result = reducer.apply(t.result, s.result);
6057	<	}
6058	<	if ((par = t.parent) == null ||
6059	<	!(par instanceof MapReduceEntriesToLongTask)) {
6060	<	t.quietlyComplete();
6834	<	break;
6835	<	}
6836	<	t = (MapReduceEntriesToLongTask<K,V>)par;
6052	>	CountedCompleter<?> c;
6053	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6054	>	@SuppressWarnings("unchecked")
6055	>	MapReduceEntriesToLongTask<K,V>
6056	>	t = (MapReduceEntriesToLongTask<K,V>)c,
6057	>	s = t.rights;
6058	>	while (s != null) {
6059	>	t.result = reducer.applyAsLong(t.result, s.result);
6060	>	s = t.rights = s.nextRight;
6061		}
6838	–	else if (t.casPending(c, c - 1))
6839	–	break;
6062		}
6841	–	} catch (Throwable ex) {
6842	–	return tryCompleteComputation(ex);
6843	–	}
6844	–	MapReduceEntriesToLongTask<K,V> s = rights;
6845	–	if (s != null && !inForkJoinPool()) {
6846	–	do  {
6847	–	if (s.tryUnfork())
6848	–	s.exec();
6849	–	} while ((s = s.nextRight) != null);
6063		}
6851	–	return false;
6064		}
6853	–	public final Long getRawResult() { return result; }
6065		}
6066
6067	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
6067	>	@SuppressWarnings("serial")
6068	>	static final class MapReduceMappingsToLongTask<K,V>
6069		extends BulkTask<K,V,Long> {
6070	<	final ObjectByObjectToLong<? super K, ? super V> transformer;
6071	<	final LongByLongToLong reducer;
6070	>	final ToLongBiFunction<? super K, ? super V> transformer;
6071	>	final LongBinaryOperator reducer;
6072		final long basis;
6073		long result;
6074		MapReduceMappingsToLongTask<K,V> rights, nextRight;
6075		MapReduceMappingsToLongTask
6076	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6076	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6077		MapReduceMappingsToLongTask<K,V> nextRight,
6078	<	ObjectByObjectToLong<? super K, ? super V> transformer,
6078	>	ToLongBiFunction<? super K, ? super V> transformer,
6079		long basis,
6080	<	LongByLongToLong reducer) {
6081	<	super(m, p, b); this.nextRight = nextRight;
6080	>	LongBinaryOperator reducer) {
6081	>	super(p, b, i, f, t); this.nextRight = nextRight;
6082		this.transformer = transformer;
6083		this.basis = basis; this.reducer = reducer;
6084		}
6085	<	@SuppressWarnings("unchecked") public final boolean exec() {
6086	<	final ObjectByObjectToLong<? super K, ? super V> transformer =
6087	<	this.transformer;
6088	<	final LongByLongToLong reducer = this.reducer;
6089	<	if (transformer == null || reducer == null)
6090	<	return abortOnNullFunction();
6091	<	try {
6092	<	final long id = this.basis;
6093	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6094	<	do {} while (!casPending(c = pending, c+1));
6085	>	public final Long getRawResult() { return result; }
6086	>	public final void compute() {
6087	>	final ToLongBiFunction<? super K, ? super V> transformer;
6088	>	final LongBinaryOperator reducer;
6089	>	if ((transformer = this.transformer) != null &&
6090	>	(reducer = this.reducer) != null) {
6091	>	long r = this.basis;
6092	>	for (int i = baseIndex, f, h; batch > 0 &&
6093	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6094	>	addToPendingCount(1);
6095		(rights = new MapReduceMappingsToLongTask<K,V>
6096	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6096	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6097	>	rights, transformer, r, reducer)).fork();
6098		}
6099	<	long r = id;
6100	<	Object v;
6888	<	while ((v = advance()) != null)
6889	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
6099	>	for (Node<K,V> p; (p = advance()) != null; )
6100	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.key, p.val));
6101		result = r;
6102	<	for (MapReduceMappingsToLongTask<K,V> t = this, s;;) {
6103	<	int c; BulkTask<K,V,?> par;
6104	<	if ((c = t.pending) == 0) {
6105	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6106	<	t.result = reducer.apply(t.result, s.result);
6107	<	}
6108	<	if ((par = t.parent) == null ||
6109	<	!(par instanceof MapReduceMappingsToLongTask)) {
6110	<	t.quietlyComplete();
6900	<	break;
6901	<	}
6902	<	t = (MapReduceMappingsToLongTask<K,V>)par;
6102	>	CountedCompleter<?> c;
6103	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6104	>	@SuppressWarnings("unchecked")
6105	>	MapReduceMappingsToLongTask<K,V>
6106	>	t = (MapReduceMappingsToLongTask<K,V>)c,
6107	>	s = t.rights;
6108	>	while (s != null) {
6109	>	t.result = reducer.applyAsLong(t.result, s.result);
6110	>	s = t.rights = s.nextRight;
6111		}
6904	–	else if (t.casPending(c, c - 1))
6905	–	break;
6112		}
6907	–	} catch (Throwable ex) {
6908	–	return tryCompleteComputation(ex);
6113		}
6910	–	MapReduceMappingsToLongTask<K,V> s = rights;
6911	–	if (s != null && !inForkJoinPool()) {
6912	–	do  {
6913	–	if (s.tryUnfork())
6914	–	s.exec();
6915	–	} while ((s = s.nextRight) != null);
6916	–	}
6917	–	return false;
6114		}
6919	–	public final Long getRawResult() { return result; }
6115		}
6116
6117	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
6117	>	@SuppressWarnings("serial")
6118	>	static final class MapReduceKeysToIntTask<K,V>
6119		extends BulkTask<K,V,Integer> {
6120	<	final ObjectToInt<? super K> transformer;
6121	<	final IntByIntToInt reducer;
6120	>	final ToIntFunction<? super K> transformer;
6121	>	final IntBinaryOperator reducer;
6122		final int basis;
6123		int result;
6124		MapReduceKeysToIntTask<K,V> rights, nextRight;
6125		MapReduceKeysToIntTask
6126	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6126	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6127		MapReduceKeysToIntTask<K,V> nextRight,
6128	<	ObjectToInt<? super K> transformer,
6128	>	ToIntFunction<? super K> transformer,
6129		int basis,
6130	<	IntByIntToInt reducer) {
6131	<	super(m, p, b); this.nextRight = nextRight;
6130	>	IntBinaryOperator reducer) {
6131	>	super(p, b, i, f, t); this.nextRight = nextRight;
6132		this.transformer = transformer;
6133		this.basis = basis; this.reducer = reducer;
6134		}
6135	<	@SuppressWarnings("unchecked") public final boolean exec() {
6136	<	final ObjectToInt<? super K> transformer =
6137	<	this.transformer;
6138	<	final IntByIntToInt reducer = this.reducer;
6139	<	if (transformer == null || reducer == null)
6140	<	return abortOnNullFunction();
6141	<	try {
6142	<	final int id = this.basis;
6143	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6144	<	do {} while (!casPending(c = pending, c+1));
6135	>	public final Integer getRawResult() { return result; }
6136	>	public final void compute() {
6137	>	final ToIntFunction<? super K> transformer;
6138	>	final IntBinaryOperator reducer;
6139	>	if ((transformer = this.transformer) != null &&
6140	>	(reducer = this.reducer) != null) {
6141	>	int r = this.basis;
6142	>	for (int i = baseIndex, f, h; batch > 0 &&
6143	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6144	>	addToPendingCount(1);
6145		(rights = new MapReduceKeysToIntTask<K,V>
6146	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6146	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6147	>	rights, transformer, r, reducer)).fork();
6148		}
6149	<	int r = id;
6150	<	while (advance() != null)
6954	<	r = reducer.apply(r, transformer.apply((K)nextKey));
6149	>	for (Node<K,V> p; (p = advance()) != null; )
6150	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.key));
6151		result = r;
6152	<	for (MapReduceKeysToIntTask<K,V> t = this, s;;) {
6153	<	int c; BulkTask<K,V,?> par;
6154	<	if ((c = t.pending) == 0) {
6155	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6156	<	t.result = reducer.apply(t.result, s.result);
6157	<	}
6158	<	if ((par = t.parent) == null ||
6159	<	!(par instanceof MapReduceKeysToIntTask)) {
6160	<	t.quietlyComplete();
6965	<	break;
6966	<	}
6967	<	t = (MapReduceKeysToIntTask<K,V>)par;
6152	>	CountedCompleter<?> c;
6153	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6154	>	@SuppressWarnings("unchecked")
6155	>	MapReduceKeysToIntTask<K,V>
6156	>	t = (MapReduceKeysToIntTask<K,V>)c,
6157	>	s = t.rights;
6158	>	while (s != null) {
6159	>	t.result = reducer.applyAsInt(t.result, s.result);
6160	>	s = t.rights = s.nextRight;
6161		}
6969	–	else if (t.casPending(c, c - 1))
6970	–	break;
6162		}
6972	–	} catch (Throwable ex) {
6973	–	return tryCompleteComputation(ex);
6974	–	}
6975	–	MapReduceKeysToIntTask<K,V> s = rights;
6976	–	if (s != null && !inForkJoinPool()) {
6977	–	do  {
6978	–	if (s.tryUnfork())
6979	–	s.exec();
6980	–	} while ((s = s.nextRight) != null);
6163		}
6982	–	return false;
6164		}
6984	–	public final Integer getRawResult() { return result; }
6165		}
6166
6167	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
6167	>	@SuppressWarnings("serial")
6168	>	static final class MapReduceValuesToIntTask<K,V>
6169		extends BulkTask<K,V,Integer> {
6170	<	final ObjectToInt<? super V> transformer;
6171	<	final IntByIntToInt reducer;
6170	>	final ToIntFunction<? super V> transformer;
6171	>	final IntBinaryOperator reducer;
6172		final int basis;
6173		int result;
6174		MapReduceValuesToIntTask<K,V> rights, nextRight;
6175		MapReduceValuesToIntTask
6176	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6176	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6177		MapReduceValuesToIntTask<K,V> nextRight,
6178	<	ObjectToInt<? super V> transformer,
6178	>	ToIntFunction<? super V> transformer,
6179		int basis,
6180	<	IntByIntToInt reducer) {
6181	<	super(m, p, b); this.nextRight = nextRight;
6180	>	IntBinaryOperator reducer) {
6181	>	super(p, b, i, f, t); this.nextRight = nextRight;
6182		this.transformer = transformer;
6183		this.basis = basis; this.reducer = reducer;
6184		}
6185	<	@SuppressWarnings("unchecked") public final boolean exec() {
6186	<	final ObjectToInt<? super V> transformer =
6187	<	this.transformer;
6188	<	final IntByIntToInt reducer = this.reducer;
6189	<	if (transformer == null || reducer == null)
6190	<	return abortOnNullFunction();
6191	<	try {
6192	<	final int id = this.basis;
6193	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6194	<	do {} while (!casPending(c = pending, c+1));
6185	>	public final Integer getRawResult() { return result; }
6186	>	public final void compute() {
6187	>	final ToIntFunction<? super V> transformer;
6188	>	final IntBinaryOperator reducer;
6189	>	if ((transformer = this.transformer) != null &&
6190	>	(reducer = this.reducer) != null) {
6191	>	int r = this.basis;
6192	>	for (int i = baseIndex, f, h; batch > 0 &&
6193	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6194	>	addToPendingCount(1);
6195		(rights = new MapReduceValuesToIntTask<K,V>
6196	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6196	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6197	>	rights, transformer, r, reducer)).fork();
6198		}
6199	<	int r = id;
6200	<	Object v;
7019	<	while ((v = advance()) != null)
7020	<	r = reducer.apply(r, transformer.apply((V)v));
6199	>	for (Node<K,V> p; (p = advance()) != null; )
6200	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.val));
6201		result = r;
6202	<	for (MapReduceValuesToIntTask<K,V> t = this, s;;) {
6203	<	int c; BulkTask<K,V,?> par;
6204	<	if ((c = t.pending) == 0) {
6205	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6206	<	t.result = reducer.apply(t.result, s.result);
6207	<	}
6208	<	if ((par = t.parent) == null ||
6209	<	!(par instanceof MapReduceValuesToIntTask)) {
6210	<	t.quietlyComplete();
7031	<	break;
7032	<	}
7033	<	t = (MapReduceValuesToIntTask<K,V>)par;
6202	>	CountedCompleter<?> c;
6203	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6204	>	@SuppressWarnings("unchecked")
6205	>	MapReduceValuesToIntTask<K,V>
6206	>	t = (MapReduceValuesToIntTask<K,V>)c,
6207	>	s = t.rights;
6208	>	while (s != null) {
6209	>	t.result = reducer.applyAsInt(t.result, s.result);
6210	>	s = t.rights = s.nextRight;
6211		}
7035	–	else if (t.casPending(c, c - 1))
7036	–	break;
6212		}
7038	–	} catch (Throwable ex) {
7039	–	return tryCompleteComputation(ex);
6213		}
7041	–	MapReduceValuesToIntTask<K,V> s = rights;
7042	–	if (s != null && !inForkJoinPool()) {
7043	–	do  {
7044	–	if (s.tryUnfork())
7045	–	s.exec();
7046	–	} while ((s = s.nextRight) != null);
7047	–	}
7048	–	return false;
6214		}
7050	–	public final Integer getRawResult() { return result; }
6215		}
6216
6217	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
6217	>	@SuppressWarnings("serial")
6218	>	static final class MapReduceEntriesToIntTask<K,V>
6219		extends BulkTask<K,V,Integer> {
6220	<	final ObjectToInt<Map.Entry<K,V>> transformer;
6221	<	final IntByIntToInt reducer;
6220	>	final ToIntFunction<Map.Entry<K,V>> transformer;
6221	>	final IntBinaryOperator reducer;
6222		final int basis;
6223		int result;
6224		MapReduceEntriesToIntTask<K,V> rights, nextRight;
6225		MapReduceEntriesToIntTask
6226	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6226	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6227		MapReduceEntriesToIntTask<K,V> nextRight,
6228	<	ObjectToInt<Map.Entry<K,V>> transformer,
6228	>	ToIntFunction<Map.Entry<K,V>> transformer,
6229		int basis,
6230	<	IntByIntToInt reducer) {
6231	<	super(m, p, b); this.nextRight = nextRight;
6230	>	IntBinaryOperator reducer) {
6231	>	super(p, b, i, f, t); this.nextRight = nextRight;
6232		this.transformer = transformer;
6233		this.basis = basis; this.reducer = reducer;
6234		}
6235	<	@SuppressWarnings("unchecked") public final boolean exec() {
6236	<	final ObjectToInt<Map.Entry<K,V>> transformer =
6237	<	this.transformer;
6238	<	final IntByIntToInt reducer = this.reducer;
6239	<	if (transformer == null || reducer == null)
6240	<	return abortOnNullFunction();
6241	<	try {
6242	<	final int id = this.basis;
6243	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6244	<	do {} while (!casPending(c = pending, c+1));
6235	>	public final Integer getRawResult() { return result; }
6236	>	public final void compute() {
6237	>	final ToIntFunction<Map.Entry<K,V>> transformer;
6238	>	final IntBinaryOperator reducer;
6239	>	if ((transformer = this.transformer) != null &&
6240	>	(reducer = this.reducer) != null) {
6241	>	int r = this.basis;
6242	>	for (int i = baseIndex, f, h; batch > 0 &&
6243	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6244	>	addToPendingCount(1);
6245		(rights = new MapReduceEntriesToIntTask<K,V>
6246	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6246	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6247	>	rights, transformer, r, reducer)).fork();
6248		}
6249	<	int r = id;
6250	<	Object v;
7085	<	while ((v = advance()) != null)
7086	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
6249	>	for (Node<K,V> p; (p = advance()) != null; )
6250	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p));
6251		result = r;
6252	<	for (MapReduceEntriesToIntTask<K,V> t = this, s;;) {
6253	<	int c; BulkTask<K,V,?> par;
6254	<	if ((c = t.pending) == 0) {
6255	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6256	<	t.result = reducer.apply(t.result, s.result);
6257	<	}
6258	<	if ((par = t.parent) == null ||
6259	<	!(par instanceof MapReduceEntriesToIntTask)) {
6260	<	t.quietlyComplete();
7097	<	break;
7098	<	}
7099	<	t = (MapReduceEntriesToIntTask<K,V>)par;
6252	>	CountedCompleter<?> c;
6253	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6254	>	@SuppressWarnings("unchecked")
6255	>	MapReduceEntriesToIntTask<K,V>
6256	>	t = (MapReduceEntriesToIntTask<K,V>)c,
6257	>	s = t.rights;
6258	>	while (s != null) {
6259	>	t.result = reducer.applyAsInt(t.result, s.result);
6260	>	s = t.rights = s.nextRight;
6261		}
7101	–	else if (t.casPending(c, c - 1))
7102	–	break;
6262		}
7104	–	} catch (Throwable ex) {
7105	–	return tryCompleteComputation(ex);
7106	–	}
7107	–	MapReduceEntriesToIntTask<K,V> s = rights;
7108	–	if (s != null && !inForkJoinPool()) {
7109	–	do  {
7110	–	if (s.tryUnfork())
7111	–	s.exec();
7112	–	} while ((s = s.nextRight) != null);
6263		}
7114	–	return false;
6264		}
7116	–	public final Integer getRawResult() { return result; }
6265		}
6266
6267	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
6267	>	@SuppressWarnings("serial")
6268	>	static final class MapReduceMappingsToIntTask<K,V>
6269		extends BulkTask<K,V,Integer> {
6270	<	final ObjectByObjectToInt<? super K, ? super V> transformer;
6271	<	final IntByIntToInt reducer;
6270	>	final ToIntBiFunction<? super K, ? super V> transformer;
6271	>	final IntBinaryOperator reducer;
6272		final int basis;
6273		int result;
6274		MapReduceMappingsToIntTask<K,V> rights, nextRight;
6275		MapReduceMappingsToIntTask
6276	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6277	<	MapReduceMappingsToIntTask<K,V> rights,
6278	<	ObjectByObjectToInt<? super K, ? super V> transformer,
6276	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6277	>	MapReduceMappingsToIntTask<K,V> nextRight,
6278	>	ToIntBiFunction<? super K, ? super V> transformer,
6279		int basis,
6280	<	IntByIntToInt reducer) {
6281	<	super(m, p, b); this.nextRight = nextRight;
6280	>	IntBinaryOperator reducer) {
6281	>	super(p, b, i, f, t); this.nextRight = nextRight;
6282		this.transformer = transformer;
6283		this.basis = basis; this.reducer = reducer;
6284		}
6285	<	@SuppressWarnings("unchecked") public final boolean exec() {
6286	<	final ObjectByObjectToInt<? super K, ? super V> transformer =
6287	<	this.transformer;
6288	<	final IntByIntToInt reducer = this.reducer;
6289	<	if (transformer == null || reducer == null)
6290	<	return abortOnNullFunction();
6291	<	try {
6292	<	final int id = this.basis;
6293	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6294	<	do {} while (!casPending(c = pending, c+1));
6285	>	public final Integer getRawResult() { return result; }
6286	>	public final void compute() {
6287	>	final ToIntBiFunction<? super K, ? super V> transformer;
6288	>	final IntBinaryOperator reducer;
6289	>	if ((transformer = this.transformer) != null &&
6290	>	(reducer = this.reducer) != null) {
6291	>	int r = this.basis;
6292	>	for (int i = baseIndex, f, h; batch > 0 &&
6293	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6294	>	addToPendingCount(1);
6295		(rights = new MapReduceMappingsToIntTask<K,V>
6296	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6296	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6297	>	rights, transformer, r, reducer)).fork();
6298		}
6299	<	int r = id;
6300	<	Object v;
7151	<	while ((v = advance()) != null)
7152	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
6299	>	for (Node<K,V> p; (p = advance()) != null; )
6300	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.key, p.val));
6301		result = r;
6302	<	for (MapReduceMappingsToIntTask<K,V> t = this, s;;) {
6303	<	int c; BulkTask<K,V,?> par;
6304	<	if ((c = t.pending) == 0) {
6305	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6306	<	t.result = reducer.apply(t.result, s.result);
6307	<	}
6308	<	if ((par = t.parent) == null ||
6309	<	!(par instanceof MapReduceMappingsToIntTask)) {
6310	<	t.quietlyComplete();
7163	<	break;
7164	<	}
7165	<	t = (MapReduceMappingsToIntTask<K,V>)par;
6302	>	CountedCompleter<?> c;
6303	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6304	>	@SuppressWarnings("unchecked")
6305	>	MapReduceMappingsToIntTask<K,V>
6306	>	t = (MapReduceMappingsToIntTask<K,V>)c,
6307	>	s = t.rights;
6308	>	while (s != null) {
6309	>	t.result = reducer.applyAsInt(t.result, s.result);
6310	>	s = t.rights = s.nextRight;
6311		}
7167	–	else if (t.casPending(c, c - 1))
7168	–	break;
6312		}
7170	–	} catch (Throwable ex) {
7171	–	return tryCompleteComputation(ex);
7172	–	}
7173	–	MapReduceMappingsToIntTask<K,V> s = rights;
7174	–	if (s != null && !inForkJoinPool()) {
7175	–	do  {
7176	–	if (s.tryUnfork())
7177	–	s.exec();
7178	–	} while ((s = s.nextRight) != null);
6313		}
7180	–	return false;
6314		}
7182	–	public final Integer getRawResult() { return result; }
6315		}
6316
6317		// Unsafe mechanics
6318	<	private static final sun.misc.Unsafe UNSAFE;
6319	<	private static final long counterOffset;
6320	<	private static final long sizeCtlOffset;
6321	<	private static final long ABASE;
6318	>	private static final Unsafe U = Unsafe.getUnsafe();
6319	>	private static final long SIZECTL;
6320	>	private static final long TRANSFERINDEX;
6321	>	private static final long BASECOUNT;
6322	>	private static final long CELLSBUSY;
6323	>	private static final long CELLVALUE;
6324	>	private static final int ABASE;
6325		private static final int ASHIFT;
6326
6327		static {
6328	<	int ss;
6329	<	try {
6330	<	UNSAFE = sun.misc.Unsafe.getUnsafe();
6331	<	Class<?> k = ConcurrentHashMap.class;
6332	<	counterOffset = UNSAFE.objectFieldOffset
6333	<	(k.getDeclaredField("counter"));
6334	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6335	<	(k.getDeclaredField("sizeCtl"));
6336	<	Class<?> sc = Node[].class;
6337	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6338	<	ss = UNSAFE.arrayIndexScale(sc);
6339	<	} catch (Exception e) {
6340	<	throw new Error(e);
6341	<	}
6342	<	if ((ss & (ss-1)) != 0)
6343	<	throw new Error("data type scale not a power of two");
6344	<	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6328	>	SIZECTL = U.objectFieldOffset
6329	>	(ConcurrentHashMap.class, "sizeCtl");
6330	>	TRANSFERINDEX = U.objectFieldOffset
6331	>	(ConcurrentHashMap.class, "transferIndex");
6332	>	BASECOUNT = U.objectFieldOffset
6333	>	(ConcurrentHashMap.class, "baseCount");
6334	>	CELLSBUSY = U.objectFieldOffset
6335	>	(ConcurrentHashMap.class, "cellsBusy");
6336	>
6337	>	CELLVALUE = U.objectFieldOffset
6338	>	(CounterCell.class, "value");
6339	>
6340	>	ABASE = U.arrayBaseOffset(Node[].class);
6341	>	int scale = U.arrayIndexScale(Node[].class);
6342	>	if ((scale & (scale - 1)) != 0)
6343	>	throw new ExceptionInInitializerError("array index scale not a power of two");
6344	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6345	>
6346	>	// Reduce the risk of rare disastrous classloading in first call to
6347	>	// LockSupport.park: https://bugs.openjdk.java.net/browse/JDK-8074773
6348	>	Class<?> ensureLoaded = LockSupport.class;
6349	>
6350	>	// Eager class load observed to help JIT during startup
6351	>	ensureLoaded = ReservationNode.class;
6352		}
6353		}

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