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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 1.250 by jsr166, Sun Sep 1 05:22:49 2013 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;
17	<	import java.util.AbstractSet;
19	<	import java.util.AbstractCollection;
20	<	import java.util.Hashtable;
16	>	import java.util.Comparator;
17	>	import java.util.Enumeration;
18		import java.util.HashMap;
19	+	import java.util.Hashtable;
20		import java.util.Iterator;
21	<	import java.util.Enumeration;
24	<	import java.util.ConcurrentModificationException;
21	>	import java.util.Map;
22		import java.util.NoSuchElementException;
23	+	import java.util.Set;
24	+	import java.util.Spliterator;
25		import java.util.concurrent.ConcurrentMap;
26	<	import java.util.concurrent.ThreadLocalRandom;
28	<	import java.util.concurrent.locks.LockSupport;
29	<	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
26	>	import java.util.concurrent.ForkJoinPool;
27		import java.util.concurrent.atomic.AtomicReference;
28	<
29	<	import java.io.Serializable;
28	>	import java.util.concurrent.locks.LockSupport;
29	>	import java.util.concurrent.locks.ReentrantLock;
30	>	import java.util.function.BiConsumer;
31	>	import java.util.function.BiFunction;
32	>	import java.util.function.BinaryOperator;
33	>	import java.util.function.Consumer;
34	>	import java.util.function.DoubleBinaryOperator;
35	>	import java.util.function.Function;
36	>	import java.util.function.IntBinaryOperator;
37	>	import java.util.function.LongBinaryOperator;
38	>	import java.util.function.ToDoubleBiFunction;
39	>	import java.util.function.ToDoubleFunction;
40	>	import java.util.function.ToIntBiFunction;
41	>	import java.util.function.ToIntFunction;
42	>	import java.util.function.ToLongBiFunction;
43	>	import java.util.function.ToLongFunction;
44	>	import java.util.stream.Stream;
45
46		/**
47		* A hash table supporting full concurrency of retrievals and
#	Line 43 | Line 55 | import java.io.Serializable;
55		* interoperable with {@code Hashtable} in programs that rely on its
56		* thread safety but not on its synchronization details.
57		*
58	<	* <p> Retrieval operations (including {@code get}) generally do not
58	>	* <p>Retrieval operations (including {@code get}) generally do not
59		* block, so may overlap with update operations (including {@code put}
60		* and {@code remove}). Retrievals reflect the results of the most
61		* recently <em>completed</em> update operations holding upon their
#	Line 52 | Line 64 | import java.io.Serializable;
64		* that key reporting the updated value.)  For aggregate operations
65		* such as {@code putAll} and {@code clear}, concurrent retrievals may
66		* reflect insertion or removal of only some entries.  Similarly,
67	<	* Iterators and Enumerations return elements reflecting the state of
68	<	* the hash table at some point at or since the creation of the
67	>	* Iterators, Spliterators and Enumerations return elements reflecting the
68	>	* state of the hash table at some point at or since the creation of the
69		* iterator/enumeration.  They do <em>not</em> throw {@link
70	<	* ConcurrentModificationException}.  However, iterators are designed
71	<	* to be used by only one thread at a time.  Bear in mind that the
72	<	* results of aggregate status methods including {@code size}, {@code
73	<	* isEmpty}, and {@code containsValue} are typically useful only when
74	<	* a map is not undergoing concurrent updates in other threads.
70	>	* java.util.ConcurrentModificationException ConcurrentModificationException}.
71	>	* However, iterators are designed to be used by only one thread at a time.
72	>	* Bear in mind that the results of aggregate status methods including
73	>	* {@code size}, {@code isEmpty}, and {@code containsValue} are typically
74	>	* useful only when a map is not undergoing concurrent updates in other threads.
75		* Otherwise the results of these methods reflect transient states
76		* that may be adequate for monitoring or estimation purposes, but not
77		* for program control.
78		*
79	<	* <p> The table is dynamically expanded when there are too many
79	>	* <p>The table is dynamically expanded when there are too many
80		* collisions (i.e., keys that have distinct hash codes but fall into
81		* the same slot modulo the table size), with the expected average
82		* effect of maintaining roughly two bins per mapping (corresponding
#	Line 83 | Line 95 | import java.io.Serializable;
95		* expected {@code concurrencyLevel} as an additional hint for
96		* internal sizing.  Note that using many keys with exactly the same
97		* {@code hashCode()} is a sure way to slow down performance of any
98	<	* hash table.
98	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
99	>	* this class may use comparison order among keys to help break ties.
100		*
101	<	* <p> A {@link Set} projection of a ConcurrentHashMap may be created
101	>	* <p>A {@link Set} projection of a ConcurrentHashMap may be created
102		* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
103		* (using {@link #keySet(Object)} when only keys are of interest, and the
104		* mapped values are (perhaps transiently) not used or all take the
105		* same mapping value.
106		*
107	<	* <p> A ConcurrentHashMap can be used as scalable frequency map (a
108	<	* form of histogram or multiset) by using {@link LongAdder} values
109	<	* and initializing via {@link #computeIfAbsent}. For example, to add
110	<	* a count to a {@code ConcurrentHashMap<String,LongAdder> freqs}, you
111	<	* can use {@code freqs.computeIfAbsent(k -> new
112	<	* LongAdder()).increment();}
107	>	* <p>A ConcurrentHashMap can be used as scalable frequency map (a
108	>	* form of histogram or multiset) by using {@link
109	>	* java.util.concurrent.atomic.LongAdder} values and initializing via
110	>	* {@link #computeIfAbsent computeIfAbsent}. For example, to add a count
111	>	* to a {@code ConcurrentHashMap<String,LongAdder> freqs}, you can use
112	>	* {@code freqs.computeIfAbsent(k -> new LongAdder()).increment();}
113		*
114		* <p>This class and its views and iterators implement all of the
115		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
116		* interfaces.
117		*
118	<	* <p> Like {@link Hashtable} but unlike {@link HashMap}, this class
118	>	* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
119		* does <em>not</em> allow {@code null} to be used as a key or value.
120		*
121	<	* <p>ConcurrentHashMaps support parallel operations using the {@link
122	<	* ForkJoinPool#commonPool}. (Tasks that may be used in other contexts
123	<	* are available in class {@link ForkJoinTasks}). These operations are
124	<	* designed to be safely, and often sensibly, applied even with maps
125	<	* that are being concurrently updated by other threads; for example,
126	<	* when computing a snapshot summary of the values in a shared
127	<	* registry.  There are three kinds of operation, each with four
128	<	* forms, accepting functions with Keys, Values, Entries, and (Key,
129	<	* Value) arguments and/or return values. (The first three forms are
130	<	* also available via the {@link #keySet()}, {@link #values()} and
131	<	* {@link #entrySet()} views). Because the elements of a
132	<	* ConcurrentHashMap are not ordered in any particular way, and may be
133	<	* processed in different orders in different parallel executions, the
134	<	* correctness of supplied functions should not depend on any
135	<	* ordering, or on any other objects or values that may transiently
123	<	* change while computation is in progress; and except for forEach
124	<	* actions, should ideally be side-effect-free.
121	>	* <p>ConcurrentHashMaps support a set of sequential and parallel bulk
122	>	* operations that, unlike most {@link Stream} methods, are designed
123	>	* to be safely, and often sensibly, applied even with maps that are
124	>	* being concurrently updated by other threads; for example, when
125	>	* computing a snapshot summary of the values in a shared registry.
126	>	* There are three kinds of operation, each with four forms, accepting
127	>	* functions with Keys, Values, Entries, and (Key, Value) arguments
128	>	* and/or return values. Because the elements of a ConcurrentHashMap
129	>	* are not ordered in any particular way, and may be processed in
130	>	* different orders in different parallel executions, the correctness
131	>	* of supplied functions should not depend on any ordering, or on any
132	>	* other objects or values that may transiently change while
133	>	* computation is in progress; and except for forEach actions, should
134	>	* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry}
135	>	* objects do not support method {@code setValue}.
136		*
137		* <ul>
138		* <li> forEach: Perform a given action on each element.
#	Line 148 | Line 159 | import java.io.Serializable;
159		* <li> Reductions to scalar doubles, longs, and ints, using a
160		* given basis value.</li>
161		*
151	–	* </li>
162		* </ul>
163	+	* </li>
164		* </ul>
165		*
166	+	* <p>These bulk operations accept a {@code parallelismThreshold}
167	+	* argument. Methods proceed sequentially if the current map size is
168	+	* estimated to be less than the given threshold. Using a value of
169	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
170	+	* of {@code 1} results in maximal parallelism by partitioning into
171	+	* enough subtasks to fully utilize the {@link
172	+	* ForkJoinPool#commonPool()} that is used for all parallel
173	+	* computations. Normally, you would initially choose one of these
174	+	* extreme values, and then measure performance of using in-between
175	+	* values that trade off overhead versus throughput.
176	+	*
177		* <p>The concurrency properties of bulk operations follow
178		* from those of ConcurrentHashMap: Any non-null result returned
179		* from {@code get(key)} and related access methods bears a
#	Line 187 | Line 209 | import java.io.Serializable;
209		* arguments can be supplied using {@code new
210		* AbstractMap.SimpleEntry(k,v)}.
211		*
212	<	* <p> Bulk operations may complete abruptly, throwing an
212	>	* <p>Bulk operations may complete abruptly, throwing an
213		* exception encountered in the application of a supplied
214		* function. Bear in mind when handling such exceptions that other
215		* concurrently executing functions could also have thrown
216		* exceptions, or would have done so if the first exception had
217		* not occurred.
218		*
219	<	* <p>Parallel speedups for bulk operations compared to sequential
220	<	* processing are common but not guaranteed.  Operations involving
221	<	* brief functions on small maps may execute more slowly than
222	<	* sequential loops if the underlying work to parallelize the
223	<	* computation is more expensive than the computation itself.
224	<	* Similarly, parallelization may not lead to much actual parallelism
225	<	* if all processors are busy performing unrelated tasks.
204	<	*
205	<	* <p> All arguments to all task methods must be non-null.
219	>	* <p>Speedups for parallel compared to sequential forms are common
220	>	* but not guaranteed.  Parallel operations involving brief functions
221	>	* on small maps may execute more slowly than sequential forms if the
222	>	* underlying work to parallelize the computation is more expensive
223	>	* than the computation itself.  Similarly, parallelization may not
224	>	* lead to much actual parallelism if all processors are busy
225	>	* performing unrelated tasks.
226		*
227	<	* <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>
227	>	* <p>All arguments to all task methods must be non-null.
228		*
229		* <p>This class is a member of the
230		* <a href="{@docRoot}/../technotes/guides/collections/index.html">
#	Line 217 | Line 235 | import java.io.Serializable;
235		* @param <K> the type of keys maintained by this map
236		* @param <V> the type of mapped values
237		*/
238	<	public class ConcurrentHashMap<K, V>
239	<	implements ConcurrentMap<K, V>, Serializable {
238	>	public class ConcurrentHashMap<K,V> extends AbstractMap<K,V>
239	>	implements ConcurrentMap<K,V>, Serializable {
240		private static final long serialVersionUID = 7249069246763182397L;
241
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	–
242		/*
243		* Overview:
244		*
#	Line 301 | Line 249 | public class ConcurrentHashMap<K, V>
249		* the same or better than java.util.HashMap, and to support high
250		* initial insertion rates on an empty table by many threads.
251		*
252	<	* Each key-value mapping is held in a Node.  Because Node fields
253	<	* can contain special values, they are defined using plain Object
254	<	* types. Similarly in turn, all internal methods that use them
255	<	* work off Object types. And similarly, so do the internal
256	<	* methods of auxiliary iterator and view classes.  All public
257	<	* generic typed methods relay in/out of these internal methods,
258	<	* supplying null-checks and casts as needed. This also allows
259	<	* many of the public methods to be factored into a smaller number
260	<	* of internal methods (although sadly not so for the five
261	<	* variants of put-related operations). The validation-based
262	<	* approach explained below leads to a lot of code sprawl because
263	<	* retry-control precludes factoring into smaller methods.
252	>	* This map usually acts as a binned (bucketed) hash table.  Each
253	>	* key-value mapping is held in a Node.  Most nodes are instances
254	>	* of the basic Node class with hash, key, value, and next
255	>	* fields. However, various subclasses exist: TreeNodes are
256	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
257	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
258	>	* of bins during resizing. ReservationNodes are used as
259	>	* placeholders while establishing values in computeIfAbsent and
260	>	* related methods.  The types TreeBin, ForwardingNode, and
261	>	* ReservationNode do not hold normal user keys, values, or
262	>	* hashes, and are readily distinguishable during search etc
263	>	* because they have negative hash fields and null key and value
264	>	* fields. (These special nodes are either uncommon or transient,
265	>	* so the impact of carrying around some unused fields is
266	>	* insignificant.)
267		*
268		* The table is lazily initialized to a power-of-two size upon the
269		* first insertion.  Each bin in the table normally contains a
#	Line 320 | Line 271 | public class ConcurrentHashMap<K, V>
271		* Table accesses require volatile/atomic reads, writes, and
272		* CASes.  Because there is no other way to arrange this without
273		* adding further indirections, we use intrinsics
274	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
275	<	* are always accurately traversable under volatile reads, so long
276	<	* as lookups check hash code and non-nullness of value before
277	<	* checking key equality.
278	<	*
279	<	* 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).
274	>	* (sun.misc.Unsafe) operations.
275	>	*
276	>	* We use the top (sign) bit of Node hash fields for control
277	>	* purposes -- it is available anyway because of addressing
278	>	* constraints.  Nodes with negative hash fields are specially
279	>	* handled or ignored in map methods.
280		*
281		* Insertion (via put or its variants) of the first node in an
282		* empty bin is performed by just CASing it to the bin.  This is
#	Line 346 | Line 285 | public class ConcurrentHashMap<K, V>
285		* delete, and replace) require locks.  We do not want to waste
286		* the space required to associate a distinct lock object with
287		* each bin, so instead use the first node of a bin list itself as
288	<	* a lock. Blocking support for these locks relies on the builtin
289	<	* "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.
288	>	* a lock. Locking support for these locks relies on builtin
289	>	* "synchronized" monitors.
290		*
291		* Using the first node of a list as a lock does not by itself
292		* suffice though: When a node is locked, any update must first
293		* validate that it is still the first node after locking it, and
294		* retry if not. Because new nodes are always appended to lists,
295		* once a node is first in a bin, it remains first until deleted
296	<	* 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.
296	>	* or the bin becomes invalidated (upon resizing).
297		*
298		* The main disadvantage of per-bin locks is that other update
299		* operations on other nodes in a bin list protected by the same
#	Line 394 | Line 326 | public class ConcurrentHashMap<K, V>
326		* sometimes deviate significantly from uniform randomness.  This
327		* includes the case when N > (1<<30), so some keys MUST collide.
328		* Similarly for dumb or hostile usages in which multiple keys are
329	<	* designed to have identical hash codes. Also, although we guard
330	<	* against the worst effects of this (see method spread), sets of
331	<	* hashes may differ only in bits that do not impact their bin
332	<	* index for a given power-of-two mask.  So we use a secondary
333	<	* strategy that applies when the number of nodes in a bin exceeds
334	<	* 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
329	>	* designed to have identical hash codes or ones that differs only
330	>	* in masked-out high bits. So we use a secondary strategy that
331	>	* applies when the number of nodes in a bin exceeds a
332	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
333	>	* specialized form of red-black trees), bounding search time to
334	>	* O(log N).  Each search step in a TreeBin is at least twice as
335		* slow as in a regular list, but given that N cannot exceed
336		* (1<<64) (before running out of addresses) this bounds search
337		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 413 | Line 342 | public class ConcurrentHashMap<K, V>
342		* iterators in the same way.
343		*
344		* The table is resized when occupancy exceeds a percentage
345	<	* threshold (nominally, 0.75, but see below).  Only a single
346	<	* thread performs the resize (using field "sizeCtl", to arrange
347	<	* exclusion), but the table otherwise remains usable for reads
348	<	* and updates. Resizing proceeds by transferring bins, one by
349	<	* one, from the table to the next table.  Because we are using
345	>	* threshold (nominally, 0.75, but see below).  Any thread
346	>	* noticing an overfull bin may assist in resizing after the
347	>	* initiating thread allocates and sets up the replacement array.
348	>	* However, rather than stalling, these other threads may proceed
349	>	* with insertions etc.  The use of TreeBins shields us from the
350	>	* worst case effects of overfilling while resizes are in
351	>	* progress.  Resizing proceeds by transferring bins, one by one,
352	>	* from the table to the next table. However, threads claim small
353	>	* blocks of indices to transfer (via field transferIndex) before
354	>	* doing so, reducing contention.  Because we are using
355		* power-of-two expansion, the elements from each bin must either
356		* stay at same index, or move with a power of two offset. We
357		* eliminate unnecessary node creation by catching cases where old
#	Line 431 | Line 365 | public class ConcurrentHashMap<K, V>
365		* its key. On encountering a forwarding node, access and update
366		* operations restart, using the new table.
367		*
368	<	* Each bin transfer requires its bin lock. However, unlike other
369	<	* cases, a transfer can skip a bin if it fails to acquire its
370	<	* lock, and revisit it later (unless it is a TreeBin). Method
371	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
372	<	* have been skipped because of failure to acquire a lock, and
373	<	* blocks only if none are available (i.e., only very rarely).
374	<	* The transfer operation must also ensure that all accessible
375	<	* bins in both the old and new table are usable by any traversal.
376	<	* When there are no lock acquisition failures, this is arranged
377	<	* simply by proceeding from the last bin (table.length - 1) up
378	<	* towards the first.  Upon seeing a forwarding node, traversals
379	<	* (see class Iter) arrange to move to the new table
380	<	* without revisiting nodes.  However, when any node is skipped
381	<	* during a transfer, all earlier table bins may have become
382	<	* visible, so are initialized with a reverse-forwarding node back
383	<	* to the old table until the new ones are established. (This
384	<	* sometimes requires transiently locking a forwarding node, which
385	<	* is possible under the above encoding.) These more expensive
386	<	* mechanics trigger only when necessary.
368	>	* Each bin transfer requires its bin lock, which can stall
369	>	* waiting for locks while resizing. However, because other
370	>	* threads can join in and help resize rather than contend for
371	>	* locks, average aggregate waits become shorter as resizing
372	>	* progresses.  The transfer operation must also ensure that all
373	>	* accessible bins in both the old and new table are usable by any
374	>	* traversal.  This is arranged in part by proceeding from the
375	>	* last bin (table.length - 1) up towards the first.  Upon seeing
376	>	* a forwarding node, traversals (see class Traverser) arrange to
377	>	* move to the new table without revisiting nodes.  To ensure that
378	>	* no intervening nodes are skipped even when moved out of order,
379	>	* a stack (see class TableStack) is created on first encounter of
380	>	* a forwarding node during a traversal, to maintain its place if
381	>	* later processing the current table. The need for these
382	>	* save/restore mechanics is relatively rare, but when one
383	>	* forwarding node is encountered, typically many more will be.
384	>	* So Traversers use a simple caching scheme to avoid creating so
385	>	* many new TableStack nodes. (Thanks to Peter Levart for
386	>	* suggesting use of a stack here.)
387		*
388		* The traversal scheme also applies to partial traversals of
389		* ranges of bins (via an alternate Traverser constructor)
#	Line 464 | Line 398 | public class ConcurrentHashMap<K, V>
398		* These cases attempt to override the initial capacity settings,
399		* but harmlessly fail to take effect in cases of races.
400		*
401	<	* The element count is maintained using a LongAdder, which avoids
402	<	* contention on updates but can encounter cache thrashing if read
403	<	* too frequently during concurrent access. To avoid reading so
404	<	* often, resizing is attempted either when a bin lock is
405	<	* contended, or upon adding to a bin already holding two or more
406	<	* nodes (checked before adding in the xIfAbsent methods, after
407	<	* adding in others). Under uniform hash distributions, the
408	<	* probability of this occurring at threshold is around 13%,
409	<	* meaning that only about 1 in 8 puts check threshold (and after
410	<	* resizing, many fewer do so). But this approximation has high
411	<	* variance for small table sizes, so we check on any collision
412	<	* for sizes <= 64. The bulk putAll operation further reduces
413	<	* contention by only committing count updates upon these size
414	<	* checks.
401	>	* The element count is maintained using a specialization of
402	>	* LongAdder. We need to incorporate a specialization rather than
403	>	* just use a LongAdder in order to access implicit
404	>	* contention-sensing that leads to creation of multiple
405	>	* CounterCells.  The counter mechanics avoid contention on
406	>	* updates but can encounter cache thrashing if read too
407	>	* frequently during concurrent access. To avoid reading so often,
408	>	* resizing under contention is attempted only upon adding to a
409	>	* bin already holding two or more nodes. Under uniform hash
410	>	* distributions, the probability of this occurring at threshold
411	>	* is around 13%, meaning that only about 1 in 8 puts check
412	>	* threshold (and after resizing, many fewer do so).
413	>	*
414	>	* TreeBins use a special form of comparison for search and
415	>	* related operations (which is the main reason we cannot use
416	>	* existing collections such as TreeMaps). TreeBins contain
417	>	* Comparable elements, but may contain others, as well as
418	>	* elements that are Comparable but not necessarily Comparable for
419	>	* the same T, so we cannot invoke compareTo among them. To handle
420	>	* this, the tree is ordered primarily by hash value, then by
421	>	* Comparable.compareTo order if applicable.  On lookup at a node,
422	>	* if elements are not comparable or compare as 0 then both left
423	>	* and right children may need to be searched in the case of tied
424	>	* hash values. (This corresponds to the full list search that
425	>	* would be necessary if all elements were non-Comparable and had
426	>	* tied hashes.) On insertion, to keep a total ordering (or as
427	>	* close as is required here) across rebalancings, we compare
428	>	* classes and identityHashCodes as tie-breakers. The red-black
429	>	* balancing code is updated from pre-jdk-collections
430	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
431	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
432	>	* Algorithms" (CLR).
433	>	*
434	>	* TreeBins also require an additional locking mechanism.  While
435	>	* list traversal is always possible by readers even during
436	>	* updates, tree traversal is not, mainly because of tree-rotations
437	>	* that may change the root node and/or its linkages.  TreeBins
438	>	* include a simple read-write lock mechanism parasitic on the
439	>	* main bin-synchronization strategy: Structural adjustments
440	>	* associated with an insertion or removal are already bin-locked
441	>	* (and so cannot conflict with other writers) but must wait for
442	>	* ongoing readers to finish. Since there can be only one such
443	>	* waiter, we use a simple scheme using a single "waiter" field to
444	>	* block writers.  However, readers need never block.  If the root
445	>	* lock is held, they proceed along the slow traversal path (via
446	>	* next-pointers) until the lock becomes available or the list is
447	>	* exhausted, whichever comes first. These cases are not fast, but
448	>	* maximize aggregate expected throughput.
449		*
450		* Maintaining API and serialization compatibility with previous
451		* versions of this class introduces several oddities. Mainly: We
#	Line 487 | Line 455 | public class ConcurrentHashMap<K, V>
455		* time that we can guarantee to honor it.) We also declare an
456		* unused "Segment" class that is instantiated in minimal form
457		* only when serializing.
458	+	*
459	+	* Also, solely for compatibility with previous versions of this
460	+	* class, it extends AbstractMap, even though all of its methods
461	+	* are overridden, so it is just useless baggage.
462	+	*
463	+	* This file is organized to make things a little easier to follow
464	+	* while reading than they might otherwise: First the main static
465	+	* declarations and utilities, then fields, then main public
466	+	* methods (with a few factorings of multiple public methods into
467	+	* internal ones), then sizing methods, trees, traversers, and
468	+	* bulk operations.
469		*/
470
471		/* ---------------- Constants -------------- */
#	Line 528 | Line 507 | public class ConcurrentHashMap<K, V>
507		private static final float LOAD_FACTOR = 0.75f;
508
509		/**
531	–	* The buffer size for skipped bins during transfers. The
532	–	* value is arbitrary but should be large enough to avoid
533	–	* most locking stalls during resizes.
534	–	*/
535	–	private static final int TRANSFER_BUFFER_SIZE = 32;
536	–
537	–	/**
510		* The bin count threshold for using a tree rather than list for a
511	<	* bin.  The value reflects the approximate break-even point for
512	<	* using tree-based operations.
511	>	* bin.  Bins are converted to trees when adding an element to a
512	>	* bin with at least this many nodes. The value must be greater
513	>	* than 2, and should be at least 8 to mesh with assumptions in
514	>	* tree removal about conversion back to plain bins upon
515	>	* shrinkage.
516		*/
517	<	private static final int TREE_THRESHOLD = 8;
543	<
544	<	/*
545	<	* Encodings for special uses of Node hash fields. See above for
546	<	* explanation.
547	<	*/
548	<	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 -------------- */
517	>	static final int TREEIFY_THRESHOLD = 8;
518
519		/**
520	<	* The array of bins. Lazily initialized upon first insertion.
521	<	* Size is always a power of two. Accessed directly by iterators.
520	>	* The bin count threshold for untreeifying a (split) bin during a
521	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
522	>	* most 6 to mesh with shrinkage detection under removal.
523		*/
524	<	transient volatile Node[] table;
524	>	static final int UNTREEIFY_THRESHOLD = 6;
525
526		/**
527	<	* The counter maintaining number of elements.
527	>	* The smallest table capacity for which bins may be treeified.
528	>	* (Otherwise the table is resized if too many nodes in a bin.)
529	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
530	>	* conflicts between resizing and treeification thresholds.
531		*/
532	<	private transient final LongAdder counter;
532	>	static final int MIN_TREEIFY_CAPACITY = 64;
533
534		/**
535	<	* Table initialization and resizing control.  When negative, the
536	<	* table is being initialized or resized. Otherwise, when table is
537	<	* null, holds the initial table size to use upon creation, or 0
538	<	* for default. After initialization, holds the next element count
539	<	* value upon which to resize the table.
535	>	* Minimum number of rebinnings per transfer step. Ranges are
536	>	* subdivided to allow multiple resizer threads.  This value
537	>	* serves as a lower bound to avoid resizers encountering
538	>	* excessive memory contention.  The value should be at least
539	>	* DEFAULT_CAPACITY.
540		*/
541	<	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;
579	<
580	<	/** For serialization compatibility. Null unless serialized; see below */
581	<	private Segment<K,V>[] segments;
582	<
583	<	/* ---------------- Table element access -------------- */
541	>	private static final int MIN_TRANSFER_STRIDE = 16;
542
543		/*
544	<	* 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.
544	>	* Encodings for Node hash fields. See above for explanation.
545		*/
546	<
547	<	static final Node tabAt(Node[] tab, int i) { // used by Iter
548	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
549	<	}
550	<
551	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
552	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
553	<	}
554	<
555	<	private static final void setTabAt(Node[] tab, int i, Node v) {
556	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
557	<	}
546	>	static final int MOVED     = -1; // hash for forwarding nodes
547	>	static final int TREEBIN   = -2; // hash for roots of trees
548	>	static final int RESERVED  = -3; // hash for transient reservations
549	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
550	>
551	>	/** Number of CPUS, to place bounds on some sizings */
552	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
553	>
554	>	/** For serialization compatibility. */
555	>	private static final ObjectStreamField[] serialPersistentFields = {
556	>	new ObjectStreamField("segments", Segment[].class),
557	>	new ObjectStreamField("segmentMask", Integer.TYPE),
558	>	new ObjectStreamField("segmentShift", Integer.TYPE)
559	>	};
560
561		/* ---------------- Nodes -------------- */
562
563		/**
564	<	* Key-value entry. Note that this is never exported out as a
565	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
566	<	* field of MOVED are special, and do not contain user keys or
567	<	* values.  Otherwise, keys are never null, and null val fields
568	<	* indicate that a node is in the process of being deleted or
569	<	* created. For purposes of read-only access, a key may be read
570	<	* before a val, but can only be used after checking val to be
571	<	* non-null.
572	<	*/
573	<	static class Node {
574	<	volatile int hash;
575	<	final Object key;
624	<	volatile Object val;
625	<	volatile Node next;
564	>	* Key-value entry.  This class is never exported out as a
565	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
566	>	* MapEntry below), but can be used for read-only traversals used
567	>	* in bulk tasks.  Subclasses of Node with a negative hash field
568	>	* are special, and contain null keys and values (but are never
569	>	* exported).  Otherwise, keys and vals are never null.
570	>	*/
571	>	static class Node<K,V> implements Map.Entry<K,V> {
572	>	final int hash;
573	>	final K key;
574	>	volatile V val;
575	>	volatile Node<K,V> next;
576
577	<	Node(int hash, Object key, Object val, Node next) {
577	>	Node(int hash, K key, V val, Node<K,V> next) {
578		this.hash = hash;
579		this.key = key;
580		this.val = val;
581		this.next = next;
582		}
583
584	<	/** CompareAndSet the hash field */
585	<	final boolean casHash(int cmp, int val) {
586	<	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
587	<	}
588	<
589	<	/** 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	<	}
705	<	}
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;
719	<
720	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
721	<	super(hash, key, val, next);
722	<	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	<	}
817	<	}
818	<
819	<	/** From CLR */
820	<	private void rotateRight(TreeNode p) {
821	<	if (p != null) {
822	<	TreeNode l = p.left, pp, lr;
823	<	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	<	}
834	<	}
835	<
836	<	/**
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;
584	>	public final K getKey()       { return key; }
585	>	public final V getValue()     { return val; }
586	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
587	>	public final String toString(){ return key + "=" + val; }
588	>	public final V setValue(V value) {
589	>	throw new UnsupportedOperationException();
590		}
591
592	<	/**
593	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
594	<	* read-lock to call getTreeNode, but during failure to get
595	<	* lock, searches along next links.
596	<	*/
597	<	final Object getValue(int h, Object k) {
598	<	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;
592	>	public final boolean equals(Object o) {
593	>	Object k, v, u; Map.Entry<?,?> e;
594	>	return ((o instanceof Map.Entry) &&
595	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
596	>	(v = e.getValue()) != null &&
597	>	(k == key || k.equals(key)) &&
598	>	(v == (u = val) || v.equals(u)));
599		}
600
601		/**
602	<	* Finds or adds a node.
899	<	* @return null if added
602	>	* Virtualized support for map.get(); overridden in subclasses.
603		*/
604	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
605	<	(int h, Object k, Object v) {
606	<	Class<?> c = k.getClass();
607	<	TreeNode pp = root, p = null;
608	<	int dir = 0;
609	<	while (pp != null) { // find existing node or leaf to insert at
610	<	int ph;  Object pk; Class<?> pc;
611	<	p = pp;
612	<	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;
604	>	Node<K,V> find(int h, Object k) {
605	>	Node<K,V> e = this;
606	>	if (k != null) {
607	>	do {
608	>	K ek;
609	>	if (e.hash == h &&
610	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
611	>	return e;
612	>	} while ((e = e.next) != null);
613		}
614		return null;
615		}
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	–	}
616		}
617
618	<	/* ---------------- Collision reduction methods -------------- */
618	>	/* ---------------- Static utilities -------------- */
619
620		/**
621	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
622	<	* Because the table uses power-of-two masking, sets of hashes
623	<	* that vary only in bits above the current mask will always
624	<	* collide. (Among known examples are sets of Float keys holding
625	<	* consecutive whole numbers in small tables.)  To counter this,
626	<	* we apply a transform that spreads the impact of higher bits
621	>	* Spreads (XORs) higher bits of hash to lower and also forces top
622	>	* bit to 0. Because the table uses power-of-two masking, sets of
623	>	* hashes that vary only in bits above the current mask will
624	>	* always collide. (Among known examples are sets of Float keys
625	>	* holding consecutive whole numbers in small tables.)  So we
626	>	* apply a transform that spreads the impact of higher bits
627		* downward. There is a tradeoff between speed, utility, and
628		* quality of bit-spreading. Because many common sets of hashes
629	<	* are already reasonably distributed across bits (so don't benefit
630	<	* from spreading), and because we use trees to handle large sets
631	<	* of collisions in bins, we don't need excessively high quality.
629	>	* are already reasonably distributed (so don't benefit from
630	>	* spreading), and because we use trees to handle large sets of
631	>	* collisions in bins, we just XOR some shifted bits in the
632	>	* cheapest possible way to reduce systematic lossage, as well as
633	>	* to incorporate impact of the highest bits that would otherwise
634	>	* never be used in index calculations because of table bounds.
635		*/
636	<	private static final int spread(int h) {
637	<	h ^= (h >>> 18) ^ (h >>> 12);
1188	<	return (h ^ (h >>> 10)) & HASH_BITS;
636	>	static final int spread(int h) {
637	>	return (h ^ (h >>> 16)) & HASH_BITS;
638		}
639
640		/**
1192	–	* Replaces a list bin with a tree bin. Call only when locked.
1193	–	* Fails to replace if the given key is non-comparable or table
1194	–	* is, or needs, resizing.
1195	–	*/
1196	–	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
1197	–	if ((key instanceof Comparable) &&
1198	–	(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;
1229	–	}
1230	–
1231	–	/**
1232	–	* Implementation for the four public remove/replace methods:
1233	–	* Replaces node value with v, conditional upon match of cv if
1234	–	* non-null.  If resulting value is null, delete.
1235	–	*/
1236	–	private final Object internalReplace(Object k, Object v, Object cv) {
1237	–	int h = spread(k.hashCode());
1238	–	Object oldVal = null;
1239	–	for (Node[] tab = table;;) {
1240	–	Node f; int i, fh; Object fk;
1241	–	if (tab == null ||
1242	–	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1243	–	break;
1244	–	else if ((fh = f.hash) == MOVED) {
1245	–	if ((fk = f.key) instanceof TreeBin) {
1246	–	TreeBin t = (TreeBin)fk;
1247	–	boolean validated = false;
1248	–	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	–	}
1534	–	}
1535	–	}
1536	–	}
1537	–	counter.add(1L);
1538	–	if (count > 1)
1539	–	checkForResize();
1540	–	return null;
1541	–	}
1542	–
1543	–	/** Implementation for computeIfAbsent */
1544	–	private final Object internalComputeIfAbsent(K k,
1545	–	Fun<? super K, ?> mf) {
1546	–	int h = spread(k.hashCode());
1547	–	Object val = null;
1548	–	int count = 0;
1549	–	for (Node[] tab = table;;) {
1550	–	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;
1669	–	}
1670	–
1671	–	/** 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	–	}
1795	–
1796	–	/** Implementation for merge */
1797	–	@SuppressWarnings("unchecked") private final Object internalMerge
1798	–	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
1799	–	int h = spread(k.hashCode());
1800	–	Object val = null;
1801	–	int delta = 0;
1802	–	int count = 0;
1803	–	for (Node[] tab = table;;) {
1804	–	int i; Node f; int fh; Object fk, fv;
1805	–	if (tab == null)
1806	–	tab = initTable();
1807	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1808	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1809	–	delta = 1;
1810	–	val = v;
1811	–	break;
1812	–	}
1813	–	}
1814	–	else if ((fh = f.hash) == MOVED) {
1815	–	if ((fk = f.key) instanceof TreeBin) {
1816	–	TreeBin t = (TreeBin)fk;
1817	–	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;
1902	–	}
1903	–
1904	–	/** Implementation for putAll */
1905	–	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();
2005	–	}
2006	–
2007	–	/* ---------------- Table Initialization and Resizing -------------- */
2008	–
2009	–	/**
641		* Returns a power of two table size for the given desired capacity.
642		* See Hackers Delight, sec 3.2
643		*/
#	Line 2021 | Line 652 | public class ConcurrentHashMap<K, V>
652		}
653
654		/**
655	<	* Initializes table, using the size recorded in sizeCtl.
655	>	* Returns x's Class if it is of the form "class C implements
656	>	* Comparable<C>", else null.
657		*/
658	<	private final Node[] initTable() {
659	<	Node[] tab; int sc;
660	<	while ((tab = table) == null) {
661	<	if ((sc = sizeCtl) < 0)
662	<	Thread.yield(); // lost initialization race; just spin
663	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
664	<	try {
665	<	if ((tab = table) == null) {
666	<	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
667	<	tab = table = new Node[n];
668	<	sc = n - (n >>> 2);
669	<	}
670	<	} finally {
2039	<	sizeCtl = sc;
658	>	static Class<?> comparableClassFor(Object x) {
659	>	if (x instanceof Comparable) {
660	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
661	>	if ((c = x.getClass()) == String.class) // bypass checks
662	>	return c;
663	>	if ((ts = c.getGenericInterfaces()) != null) {
664	>	for (int i = 0; i < ts.length; ++i) {
665	>	if (((t = ts[i]) instanceof ParameterizedType) &&
666	>	((p = (ParameterizedType)t).getRawType() ==
667	>	Comparable.class) &&
668	>	(as = p.getActualTypeArguments()) != null &&
669	>	as.length == 1 && as[0] == c) // type arg is c
670	>	return c;
671		}
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;
672		}
673		}
674	+	return null;
675		}
676
677		/**
678	<	* Tries to presize table to accommodate the given number of elements.
679	<	*
2073	<	* @param size number of elements (doesn't need to be perfectly accurate)
678	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
679	>	* class), else 0.
680		*/
681	<	private final void tryPresize(int size) {
682	<	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
683	<	tableSizeFor(size + (size >>> 1) + 1);
684	<	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	<	}
681	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
682	>	static int compareComparables(Class<?> kc, Object k, Object x) {
683	>	return (x == null || x.getClass() != kc ? 0 :
684	>	((Comparable)k).compareTo(x));
685		}
686
687	+	/* ---------------- Table element access -------------- */
688	+
689		/*
690	<	* Moves and/or copies the nodes in each bin to new table. See
691	<	* above for explanation.
692	<	*
693	<	* @return the new table
694	<	*/
695	<	private static final Node[] rebuild(Node[] tab) {
696	<	int n = tab.length;
697	<	Node[] nextTab = new Node[n << 1];
698	<	Node fwd = new Node(MOVED, nextTab, null, null);
699	<	int[] buffer = null;       // holds bins to revisit; null until needed
700	<	Node rev = null;           // reverse forwarder; null until needed
701	<	int nbuffered = 0;         // the number of bins in buffer list
702	<	int bufferIndex = 0;       // buffer index of current buffered bin
703	<	int bin = n - 1;           // current non-buffered bin or -1 if none
704	<
705	<	for (int i = bin;;) {      // start upwards sweep
706	<	int fh; Node f;
707	<	if ((f = tabAt(tab, i)) == null) {
708	<	if (bin >= 0) {    // Unbuffered; no lock needed (or available)
709	<	if (!casTabAt(tab, i, f, fwd))
710	<	continue;
711	<	}
712	<	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	<	}
690	>	* Volatile access methods are used for table elements as well as
691	>	* elements of in-progress next table while resizing.  All uses of
692	>	* the tab arguments must be null checked by callers.  All callers
693	>	* also paranoically precheck that tab's length is not zero (or an
694	>	* equivalent check), thus ensuring that any index argument taking
695	>	* the form of a hash value anded with (length - 1) is a valid
696	>	* index.  Note that, to be correct wrt arbitrary concurrency
697	>	* errors by users, these checks must operate on local variables,
698	>	* which accounts for some odd-looking inline assignments below.
699	>	* Note that calls to setTabAt always occur within locked regions,
700	>	* and so in principle require only release ordering, not need
701	>	* full volatile semantics, but are currently coded as volatile
702	>	* writes to be conservative.
703	>	*/
704	>
705	>	@SuppressWarnings("unchecked")
706	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
707	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
708	>	}
709	>
710	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
711	>	Node<K,V> c, Node<K,V> v) {
712	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
713		}
714
715	<	/**
716	<	* Splits a normal bin with list headed by e into lo and hi parts;
2216	<	* installs in given table.
2217	<	*/
2218	<	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);
715	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
716	>	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
717		}
718
719	+	/* ---------------- Fields -------------- */
720	+
721		/**
722	<	* Splits a tree bin into lo and hi parts; installs in given table.
722	>	* The array of bins. Lazily initialized upon first insertion.
723	>	* Size is always a power of two. Accessed directly by iterators.
724		*/
725	<	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	<	}
725	>	transient volatile Node<K,V>[] table;
726
727		/**
728	<	* Implementation for clear. Steps through each bin, removing all
2286	<	* nodes.
728	>	* The next table to use; non-null only while resizing.
729		*/
730	<	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 -------------- */
730	>	private transient volatile Node<K,V>[] nextTable;
731
732		/**
733	<	* Encapsulates traversal for methods such as containsValue; also
734	<	* serves as a base class for other iterators and bulk tasks.
735	<	*
736	<	* At each step, the iterator snapshots the key ("nextKey") and
737	<	* 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
733	>	* Base counter value, used mainly when there is no contention,
734	>	* but also as a fallback during table initialization
735	>	* races. Updated via CAS.
736	>	*/
737	>	private transient volatile long baseCount;
738
739	<	/** Creates iterator for all entries in the table. */
740	<	Traverser(ConcurrentHashMap<K, V> map) {
741	<	this.map = map;
742	<	}
739	>	/**
740	>	* Table initialization and resizing control.  When negative, the
741	>	* table is being initialized or resized: -1 for initialization,
742	>	* else -(1 + the number of active resizing threads).  Otherwise,
743	>	* when table is null, holds the initial table size to use upon
744	>	* creation, or 0 for default. After initialization, holds the
745	>	* next element count value upon which to resize the table.
746	>	*/
747	>	private transient volatile int sizeCtl;
748
749	<	/** Creates iterator for split() methods */
750	<	Traverser(Traverser<K,V,?> it) {
751	<	ConcurrentHashMap<K, V> m; Node[] t;
752	<	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	<	}
749	>	/**
750	>	* The next table index (plus one) to split while resizing.
751	>	*/
752	>	private transient volatile int transferIndex;
753
754	<	/**
755	<	* Advances next; returns nextVal or null if terminated.
756	<	* See above for explanation.
757	<	*/
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	<	}
754	>	/**
755	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
756	>	*/
757	>	private transient volatile int cellsBusy;
758
759	<	public final void remove() {
760	<	Object k = nextKey;
761	<	if (k == null && (advance() == null || (k = nextKey) == null))
762	<	throw new IllegalStateException();
2468	<	map.internalReplace(k, null, null);
2469	<	}
759	>	/**
760	>	* Table of counter cells. When non-null, size is a power of 2.
761	>	*/
762	>	private transient volatile CounterCell[] counterCells;
763
764	<	public final boolean hasNext() {
765	<	return nextVal != null || advance() != null;
766	<	}
764	>	// views
765	>	private transient KeySetView<K,V> keySet;
766	>	private transient ValuesView<K,V> values;
767	>	private transient EntrySetView<K,V> entrySet;
768
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	–	}
769
770		/* ---------------- Public operations -------------- */
771
#	Line 2484 | Line 773 | public class ConcurrentHashMap<K, V>
773		* Creates a new, empty map with the default initial table size (16).
774		*/
775		public ConcurrentHashMap() {
2487	–	this.counter = new LongAdder();
776		}
777
778		/**
#	Line 2503 | Line 791 | public class ConcurrentHashMap<K, V>
791		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
792		MAXIMUM_CAPACITY :
793		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2506	–	this.counter = new LongAdder();
794		this.sizeCtl = cap;
795		}
796
#	Line 2513 | Line 800 | public class ConcurrentHashMap<K, V>
800		* @param m the map
801		*/
802		public ConcurrentHashMap(Map<? extends K, ? extends V> m) {
2516	–	this.counter = new LongAdder();
803		this.sizeCtl = DEFAULT_CAPACITY;
804	<	internalPutAll(m);
804	>	putAll(m);
805		}
806
807		/**
#	Line 2556 | Line 842 | public class ConcurrentHashMap<K, V>
842		* nonpositive
843		*/
844		public ConcurrentHashMap(int initialCapacity,
845	<	float loadFactor, int concurrencyLevel) {
845	>	float loadFactor, int concurrencyLevel) {
846		if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
847		throw new IllegalArgumentException();
848		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
#	Line 2564 | Line 850 | public class ConcurrentHashMap<K, V>
850		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
851		int cap = (size >= (long)MAXIMUM_CAPACITY) ?
852		MAXIMUM_CAPACITY : tableSizeFor((int)size);
2567	–	this.counter = new LongAdder();
853		this.sizeCtl = cap;
854		}
855
856	<	/**
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	<	}
856	>	// Original (since JDK1.2) Map methods
857
858		/**
859		* {@inheritDoc}
860		*/
861		public int size() {
862	<	long n = counter.sum();
862	>	long n = sumCount();
863		return ((n < 0L) ? 0 :
864		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
865		(int)n);
866		}
867
868		/**
869	<	* 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
869	>	* {@inheritDoc}
870		*/
871	<	public long mappingCount() {
872	<	long n = counter.sum();
2625	<	return (n < 0L) ? 0L : n; // ignore transient negative values
871	>	public boolean isEmpty() {
872	>	return sumCount() <= 0L; // ignore transient negative values
873		}
874
875		/**
#	Line 2636 | Line 883 | public class ConcurrentHashMap<K, V>
883		*
884		* @throws NullPointerException if the specified key is null
885		*/
886	<	@SuppressWarnings("unchecked") public V get(Object key) {
887	<	if (key == null)
888	<	throw new NullPointerException();
889	<	return (V)internalGet(key);
890	<	}
891	<
892	<	/**
893	<	* Returns the value to which the specified key is mapped,
894	<	* or the given defaultValue if this map contains no mapping for the key.
895	<	*
896	<	* @param key the key
897	<	* @param defaultValue the value to return if this map contains
898	<	* no mapping for the given key
899	<	* @return the mapping for the key, if present; else the defaultValue
900	<	* @throws NullPointerException if the specified key is null
901	<	*/
902	<	@SuppressWarnings("unchecked") public V getValueOrDefault(Object key, V defaultValue) {
903	<	if (key == null)
2657	<	throw new NullPointerException();
2658	<	V v = (V) internalGet(key);
2659	<	return v == null ? defaultValue : v;
886	>	public V get(Object key) {
887	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
888	>	int h = spread(key.hashCode());
889	>	if ((tab = table) != null && (n = tab.length) > 0 &&
890	>	(e = tabAt(tab, (n - 1) & h)) != null) {
891	>	if ((eh = e.hash) == h) {
892	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
893	>	return e.val;
894	>	}
895	>	else if (eh < 0)
896	>	return (p = e.find(h, key)) != null ? p.val : null;
897	>	while ((e = e.next) != null) {
898	>	if (e.hash == h &&
899	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
900	>	return e.val;
901	>	}
902	>	}
903	>	return null;
904		}
905
906		/**
907		* Tests if the specified object is a key in this table.
908		*
909	<	* @param  key   possible key
909	>	* @param  key possible key
910		* @return {@code true} if and only if the specified object
911		*         is a key in this table, as determined by the
912		*         {@code equals} method; {@code false} otherwise
913		* @throws NullPointerException if the specified key is null
914		*/
915		public boolean containsKey(Object key) {
916	<	if (key == null)
2673	<	throw new NullPointerException();
2674	<	return internalGet(key) != null;
916	>	return get(key) != null;
917		}
918
919		/**
#	Line 2687 | Line 929 | public class ConcurrentHashMap<K, V>
929		public boolean containsValue(Object value) {
930		if (value == null)
931		throw new NullPointerException();
932	<	Object v;
933	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
934	<	while ((v = it.advance()) != null) {
935	<	if (v == value || value.equals(v))
936	<	return true;
932	>	Node<K,V>[] t;
933	>	if ((t = table) != null) {
934	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
935	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
936	>	V v;
937	>	if ((v = p.val) == value || (v != null && value.equals(v)))
938	>	return true;
939	>	}
940		}
941		return false;
942		}
943
944		/**
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	–	/**
945		* Maps the specified key to the specified value in this table.
946		* Neither the key nor the value can be null.
947		*
948	<	* <p> The value can be retrieved by calling the {@code get} method
948	>	* <p>The value can be retrieved by calling the {@code get} method
949		* with a key that is equal to the original key.
950		*
951		* @param key key with which the specified value is to be associated
#	Line 2728 | Line 954 | public class ConcurrentHashMap<K, V>
954		*         {@code null} if there was no mapping for {@code key}
955		* @throws NullPointerException if the specified key or value is null
956		*/
957	<	@SuppressWarnings("unchecked") public V put(K key, V value) {
958	<	if (key == null || value == null)
957	>	public V put(K key, V value) {
958	>	return putVal(key, value, false);
959	>	}
960	>
961	>	/** Implementation for put and putIfAbsent */
962	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
963	>	if (key == null || value == null) throw new NullPointerException();
964	>	int hash = spread(key.hashCode());
965	>	int binCount = 0;
966	>	for (Node<K,V>[] tab = table;;) {
967	>	Node<K,V> f; int n, i, fh;
968	>	if (tab == null || (n = tab.length) == 0)
969	>	tab = initTable();
970	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
971	>	if (casTabAt(tab, i, null,
972	>	new Node<K,V>(hash, key, value, null)))
973	>	break;                   // no lock when adding to empty bin
974	>	}
975	>	else if ((fh = f.hash) == MOVED)
976	>	tab = helpTransfer(tab, f);
977	>	else {
978	>	V oldVal = null;
979	>	synchronized (f) {
980	>	if (tabAt(tab, i) == f) {
981	>	if (fh >= 0) {
982	>	binCount = 1;
983	>	for (Node<K,V> e = f;; ++binCount) {
984	>	K ek;
985	>	if (e.hash == hash &&
986	>	((ek = e.key) == key ||
987	>	(ek != null && key.equals(ek)))) {
988	>	oldVal = e.val;
989	>	if (!onlyIfAbsent)
990	>	e.val = value;
991	>	break;
992	>	}
993	>	Node<K,V> pred = e;
994	>	if ((e = e.next) == null) {
995	>	pred.next = new Node<K,V>(hash, key,
996	>	value, null);
997	>	break;
998	>	}
999	>	}
1000	>	}
1001	>	else if (f instanceof TreeBin) {
1002	>	Node<K,V> p;
1003	>	binCount = 2;
1004	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1005	>	value)) != null) {
1006	>	oldVal = p.val;
1007	>	if (!onlyIfAbsent)
1008	>	p.val = value;
1009	>	}
1010	>	}
1011	>	}
1012	>	}
1013	>	if (binCount != 0) {
1014	>	if (binCount >= TREEIFY_THRESHOLD)
1015	>	treeifyBin(tab, i);
1016	>	if (oldVal != null)
1017	>	return oldVal;
1018	>	break;
1019	>	}
1020	>	}
1021	>	}
1022	>	addCount(1L, binCount);
1023	>	return null;
1024	>	}
1025	>
1026	>	/**
1027	>	* Copies all of the mappings from the specified map to this one.
1028	>	* These mappings replace any mappings that this map had for any of the
1029	>	* keys currently in the specified map.
1030	>	*
1031	>	* @param m mappings to be stored in this map
1032	>	*/
1033	>	public void putAll(Map<? extends K, ? extends V> m) {
1034	>	tryPresize(m.size());
1035	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1036	>	putVal(e.getKey(), e.getValue(), false);
1037	>	}
1038	>
1039	>	/**
1040	>	* Removes the key (and its corresponding value) from this map.
1041	>	* This method does nothing if the key is not in the map.
1042	>	*
1043	>	* @param  key the key that needs to be removed
1044	>	* @return the previous value associated with {@code key}, or
1045	>	*         {@code null} if there was no mapping for {@code key}
1046	>	* @throws NullPointerException if the specified key is null
1047	>	*/
1048	>	public V remove(Object key) {
1049	>	return replaceNode(key, null, null);
1050	>	}
1051	>
1052	>	/**
1053	>	* Implementation for the four public remove/replace methods:
1054	>	* Replaces node value with v, conditional upon match of cv if
1055	>	* non-null.  If resulting value is null, delete.
1056	>	*/
1057	>	final V replaceNode(Object key, V value, Object cv) {
1058	>	int hash = spread(key.hashCode());
1059	>	for (Node<K,V>[] tab = table;;) {
1060	>	Node<K,V> f; int n, i, fh;
1061	>	if (tab == null || (n = tab.length) == 0 ||
1062	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1063	>	break;
1064	>	else if ((fh = f.hash) == MOVED)
1065	>	tab = helpTransfer(tab, f);
1066	>	else {
1067	>	V oldVal = null;
1068	>	boolean validated = false;
1069	>	synchronized (f) {
1070	>	if (tabAt(tab, i) == f) {
1071	>	if (fh >= 0) {
1072	>	validated = true;
1073	>	for (Node<K,V> e = f, pred = null;;) {
1074	>	K ek;
1075	>	if (e.hash == hash &&
1076	>	((ek = e.key) == key ||
1077	>	(ek != null && key.equals(ek)))) {
1078	>	V ev = e.val;
1079	>	if (cv == null || cv == ev ||
1080	>	(ev != null && cv.equals(ev))) {
1081	>	oldVal = ev;
1082	>	if (value != null)
1083	>	e.val = value;
1084	>	else if (pred != null)
1085	>	pred.next = e.next;
1086	>	else
1087	>	setTabAt(tab, i, e.next);
1088	>	}
1089	>	break;
1090	>	}
1091	>	pred = e;
1092	>	if ((e = e.next) == null)
1093	>	break;
1094	>	}
1095	>	}
1096	>	else if (f instanceof TreeBin) {
1097	>	validated = true;
1098	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1099	>	TreeNode<K,V> r, p;
1100	>	if ((r = t.root) != null &&
1101	>	(p = r.findTreeNode(hash, key, null)) != null) {
1102	>	V pv = p.val;
1103	>	if (cv == null || cv == pv ||
1104	>	(pv != null && cv.equals(pv))) {
1105	>	oldVal = pv;
1106	>	if (value != null)
1107	>	p.val = value;
1108	>	else if (t.removeTreeNode(p))
1109	>	setTabAt(tab, i, untreeify(t.first));
1110	>	}
1111	>	}
1112	>	}
1113	>	}
1114	>	}
1115	>	if (validated) {
1116	>	if (oldVal != null) {
1117	>	if (value == null)
1118	>	addCount(-1L, -1);
1119	>	return oldVal;
1120	>	}
1121	>	break;
1122	>	}
1123	>	}
1124	>	}
1125	>	return null;
1126	>	}
1127	>
1128	>	/**
1129	>	* Removes all of the mappings from this map.
1130	>	*/
1131	>	public void clear() {
1132	>	long delta = 0L; // negative number of deletions
1133	>	int i = 0;
1134	>	Node<K,V>[] tab = table;
1135	>	while (tab != null && i < tab.length) {
1136	>	int fh;
1137	>	Node<K,V> f = tabAt(tab, i);
1138	>	if (f == null)
1139	>	++i;
1140	>	else if ((fh = f.hash) == MOVED) {
1141	>	tab = helpTransfer(tab, f);
1142	>	i = 0; // restart
1143	>	}
1144	>	else {
1145	>	synchronized (f) {
1146	>	if (tabAt(tab, i) == f) {
1147	>	Node<K,V> p = (fh >= 0 ? f :
1148	>	(f instanceof TreeBin) ?
1149	>	((TreeBin<K,V>)f).first : null);
1150	>	while (p != null) {
1151	>	--delta;
1152	>	p = p.next;
1153	>	}
1154	>	setTabAt(tab, i++, null);
1155	>	}
1156	>	}
1157	>	}
1158	>	}
1159	>	if (delta != 0L)
1160	>	addCount(delta, -1);
1161	>	}
1162	>
1163	>	/**
1164	>	* Returns a {@link Set} view of the keys contained in this map.
1165	>	* The set is backed by the map, so changes to the map are
1166	>	* reflected in the set, and vice-versa. The set supports element
1167	>	* removal, which removes the corresponding mapping from this map,
1168	>	* via the {@code Iterator.remove}, {@code Set.remove},
1169	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1170	>	* operations.  It does not support the {@code add} or
1171	>	* {@code addAll} operations.
1172	>	*
1173	>	* <p>The view's iterators and spliterators are
1174	>	* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>.
1175	>	*
1176	>	* <p>The view's {@code spliterator} reports {@link Spliterator#CONCURRENT},
1177	>	* {@link Spliterator#DISTINCT}, and {@link Spliterator#NONNULL}.
1178	>	*
1179	>	* @return the set view
1180	>	*/
1181	>	public KeySetView<K,V> keySet() {
1182	>	KeySetView<K,V> ks;
1183	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1184	>	}
1185	>
1186	>	/**
1187	>	* Returns a {@link Collection} view of the values contained in this map.
1188	>	* The collection is backed by the map, so changes to the map are
1189	>	* reflected in the collection, and vice-versa.  The collection
1190	>	* supports element removal, which removes the corresponding
1191	>	* mapping from this map, via the {@code Iterator.remove},
1192	>	* {@code Collection.remove}, {@code removeAll},
1193	>	* {@code retainAll}, and {@code clear} operations.  It does not
1194	>	* support the {@code add} or {@code addAll} operations.
1195	>	*
1196	>	* <p>The view's iterators and spliterators are
1197	>	* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>.
1198	>	*
1199	>	* <p>The view's {@code spliterator} reports {@link Spliterator#CONCURRENT}
1200	>	* and {@link Spliterator#NONNULL}.
1201	>	*
1202	>	* @return the collection view
1203	>	*/
1204	>	public Collection<V> values() {
1205	>	ValuesView<K,V> vs;
1206	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1207	>	}
1208	>
1209	>	/**
1210	>	* Returns a {@link Set} view of the mappings contained in this map.
1211	>	* The set is backed by the map, so changes to the map are
1212	>	* reflected in the set, and vice-versa.  The set supports element
1213	>	* removal, which removes the corresponding mapping from the map,
1214	>	* via the {@code Iterator.remove}, {@code Set.remove},
1215	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1216	>	* operations.
1217	>	*
1218	>	* <p>The view's iterators and spliterators are
1219	>	* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>.
1220	>	*
1221	>	* <p>The view's {@code spliterator} reports {@link Spliterator#CONCURRENT},
1222	>	* {@link Spliterator#DISTINCT}, and {@link Spliterator#NONNULL}.
1223	>	*
1224	>	* @return the set view
1225	>	*/
1226	>	public Set<Map.Entry<K,V>> entrySet() {
1227	>	EntrySetView<K,V> es;
1228	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1229	>	}
1230	>
1231	>	/**
1232	>	* Returns the hash code value for this {@link Map}, i.e.,
1233	>	* the sum of, for each key-value pair in the map,
1234	>	* {@code key.hashCode() ^ value.hashCode()}.
1235	>	*
1236	>	* @return the hash code value for this map
1237	>	*/
1238	>	public int hashCode() {
1239	>	int h = 0;
1240	>	Node<K,V>[] t;
1241	>	if ((t = table) != null) {
1242	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1243	>	for (Node<K,V> p; (p = it.advance()) != null; )
1244	>	h += p.key.hashCode() ^ p.val.hashCode();
1245	>	}
1246	>	return h;
1247	>	}
1248	>
1249	>	/**
1250	>	* Returns a string representation of this map.  The string
1251	>	* representation consists of a list of key-value mappings (in no
1252	>	* particular order) enclosed in braces ("{@code {}}").  Adjacent
1253	>	* mappings are separated by the characters {@code ", "} (comma
1254	>	* and space).  Each key-value mapping is rendered as the key
1255	>	* followed by an equals sign ("{@code =}") followed by the
1256	>	* associated value.
1257	>	*
1258	>	* @return a string representation of this map
1259	>	*/
1260	>	public String toString() {
1261	>	Node<K,V>[] t;
1262	>	int f = (t = table) == null ? 0 : t.length;
1263	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1264	>	StringBuilder sb = new StringBuilder();
1265	>	sb.append('{');
1266	>	Node<K,V> p;
1267	>	if ((p = it.advance()) != null) {
1268	>	for (;;) {
1269	>	K k = p.key;
1270	>	V v = p.val;
1271	>	sb.append(k == this ? "(this Map)" : k);
1272	>	sb.append('=');
1273	>	sb.append(v == this ? "(this Map)" : v);
1274	>	if ((p = it.advance()) == null)
1275	>	break;
1276	>	sb.append(',').append(' ');
1277	>	}
1278	>	}
1279	>	return sb.append('}').toString();
1280	>	}
1281	>
1282	>	/**
1283	>	* Compares the specified object with this map for equality.
1284	>	* Returns {@code true} if the given object is a map with the same
1285	>	* mappings as this map.  This operation may return misleading
1286	>	* results if either map is concurrently modified during execution
1287	>	* of this method.
1288	>	*
1289	>	* @param o object to be compared for equality with this map
1290	>	* @return {@code true} if the specified object is equal to this map
1291	>	*/
1292	>	public boolean equals(Object o) {
1293	>	if (o != this) {
1294	>	if (!(o instanceof Map))
1295	>	return false;
1296	>	Map<?,?> m = (Map<?,?>) o;
1297	>	Node<K,V>[] t;
1298	>	int f = (t = table) == null ? 0 : t.length;
1299	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1300	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1301	>	V val = p.val;
1302	>	Object v = m.get(p.key);
1303	>	if (v == null || (v != val && !v.equals(val)))
1304	>	return false;
1305	>	}
1306	>	for (Map.Entry<?,?> e : m.entrySet()) {
1307	>	Object mk, mv, v;
1308	>	if ((mk = e.getKey()) == null ||
1309	>	(mv = e.getValue()) == null ||
1310	>	(v = get(mk)) == null ||
1311	>	(mv != v && !mv.equals(v)))
1312	>	return false;
1313	>	}
1314	>	}
1315	>	return true;
1316	>	}
1317	>
1318	>	/**
1319	>	* Stripped-down version of helper class used in previous version,
1320	>	* declared for the sake of serialization compatibility
1321	>	*/
1322	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1323	>	private static final long serialVersionUID = 2249069246763182397L;
1324	>	final float loadFactor;
1325	>	Segment(float lf) { this.loadFactor = lf; }
1326	>	}
1327	>
1328	>	/**
1329	>	* Saves the state of the {@code ConcurrentHashMap} instance to a
1330	>	* stream (i.e., serializes it).
1331	>	* @param s the stream
1332	>	* @throws java.io.IOException if an I/O error occurs
1333	>	* @serialData
1334	>	* the key (Object) and value (Object)
1335	>	* for each key-value mapping, followed by a null pair.
1336	>	* The key-value mappings are emitted in no particular order.
1337	>	*/
1338	>	private void writeObject(java.io.ObjectOutputStream s)
1339	>	throws java.io.IOException {
1340	>	// For serialization compatibility
1341	>	// Emulate segment calculation from previous version of this class
1342	>	int sshift = 0;
1343	>	int ssize = 1;
1344	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1345	>	++sshift;
1346	>	ssize <<= 1;
1347	>	}
1348	>	int segmentShift = 32 - sshift;
1349	>	int segmentMask = ssize - 1;
1350	>	@SuppressWarnings("unchecked")
1351	>	Segment<K,V>[] segments = (Segment<K,V>[])
1352	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1353	>	for (int i = 0; i < segments.length; ++i)
1354	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1355	>	s.putFields().put("segments", segments);
1356	>	s.putFields().put("segmentShift", segmentShift);
1357	>	s.putFields().put("segmentMask", segmentMask);
1358	>	s.writeFields();
1359	>
1360	>	Node<K,V>[] t;
1361	>	if ((t = table) != null) {
1362	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1363	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1364	>	s.writeObject(p.key);
1365	>	s.writeObject(p.val);
1366	>	}
1367	>	}
1368	>	s.writeObject(null);
1369	>	s.writeObject(null);
1370	>	segments = null; // throw away
1371	>	}
1372	>
1373	>	/**
1374	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1375	>	* @param s the stream
1376	>	* @throws ClassNotFoundException if the class of a serialized object
1377	>	*         could not be found
1378	>	* @throws java.io.IOException if an I/O error occurs
1379	>	*/
1380	>	private void readObject(java.io.ObjectInputStream s)
1381	>	throws java.io.IOException, ClassNotFoundException {
1382	>	/*
1383	>	* To improve performance in typical cases, we create nodes
1384	>	* while reading, then place in table once size is known.
1385	>	* However, we must also validate uniqueness and deal with
1386	>	* overpopulated bins while doing so, which requires
1387	>	* specialized versions of putVal mechanics.
1388	>	*/
1389	>	sizeCtl = -1; // force exclusion for table construction
1390	>	s.defaultReadObject();
1391	>	long size = 0L;
1392	>	Node<K,V> p = null;
1393	>	for (;;) {
1394	>	@SuppressWarnings("unchecked")
1395	>	K k = (K) s.readObject();
1396	>	@SuppressWarnings("unchecked")
1397	>	V v = (V) s.readObject();
1398	>	if (k != null && v != null) {
1399	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1400	>	++size;
1401	>	}
1402	>	else
1403	>	break;
1404	>	}
1405	>	if (size == 0L)
1406	>	sizeCtl = 0;
1407	>	else {
1408	>	int n;
1409	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1410	>	n = MAXIMUM_CAPACITY;
1411	>	else {
1412	>	int sz = (int)size;
1413	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1414	>	}
1415	>	@SuppressWarnings("unchecked")
1416	>	Node<K,V>[] tab = (Node<K,V>[])new Node<?,?>[n];
1417	>	int mask = n - 1;
1418	>	long added = 0L;
1419	>	while (p != null) {
1420	>	boolean insertAtFront;
1421	>	Node<K,V> next = p.next, first;
1422	>	int h = p.hash, j = h & mask;
1423	>	if ((first = tabAt(tab, j)) == null)
1424	>	insertAtFront = true;
1425	>	else {
1426	>	K k = p.key;
1427	>	if (first.hash < 0) {
1428	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1429	>	if (t.putTreeVal(h, k, p.val) == null)
1430	>	++added;
1431	>	insertAtFront = false;
1432	>	}
1433	>	else {
1434	>	int binCount = 0;
1435	>	insertAtFront = true;
1436	>	Node<K,V> q; K qk;
1437	>	for (q = first; q != null; q = q.next) {
1438	>	if (q.hash == h &&
1439	>	((qk = q.key) == k ||
1440	>	(qk != null && k.equals(qk)))) {
1441	>	insertAtFront = false;
1442	>	break;
1443	>	}
1444	>	++binCount;
1445	>	}
1446	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1447	>	insertAtFront = false;
1448	>	++added;
1449	>	p.next = first;
1450	>	TreeNode<K,V> hd = null, tl = null;
1451	>	for (q = p; q != null; q = q.next) {
1452	>	TreeNode<K,V> t = new TreeNode<K,V>
1453	>	(q.hash, q.key, q.val, null, null);
1454	>	if ((t.prev = tl) == null)
1455	>	hd = t;
1456	>	else
1457	>	tl.next = t;
1458	>	tl = t;
1459	>	}
1460	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1461	>	}
1462	>	}
1463	>	}
1464	>	if (insertAtFront) {
1465	>	++added;
1466	>	p.next = first;
1467	>	setTabAt(tab, j, p);
1468	>	}
1469	>	p = next;
1470	>	}
1471	>	table = tab;
1472	>	sizeCtl = n - (n >>> 2);
1473	>	baseCount = added;
1474	>	}
1475	>	}
1476	>
1477	>	// ConcurrentMap methods
1478	>
1479	>	/**
1480	>	* {@inheritDoc}
1481	>	*
1482	>	* @return the previous value associated with the specified key,
1483	>	*         or {@code null} if there was no mapping for the key
1484	>	* @throws NullPointerException if the specified key or value is null
1485	>	*/
1486	>	public V putIfAbsent(K key, V value) {
1487	>	return putVal(key, value, true);
1488	>	}
1489	>
1490	>	/**
1491	>	* {@inheritDoc}
1492	>	*
1493	>	* @throws NullPointerException if the specified key is null
1494	>	*/
1495	>	public boolean remove(Object key, Object value) {
1496	>	if (key == null)
1497		throw new NullPointerException();
1498	<	return (V)internalPut(key, value);
1498	>	return value != null && replaceNode(key, null, value) != null;
1499	>	}
1500	>
1501	>	/**
1502	>	* {@inheritDoc}
1503	>	*
1504	>	* @throws NullPointerException if any of the arguments are null
1505	>	*/
1506	>	public boolean replace(K key, V oldValue, V newValue) {
1507	>	if (key == null || oldValue == null || newValue == null)
1508	>	throw new NullPointerException();
1509	>	return replaceNode(key, newValue, oldValue) != null;
1510		}
1511
1512		/**
#	Line 2741 | Line 1516 | public class ConcurrentHashMap<K, V>
1516		*         or {@code null} if there was no mapping for the key
1517		* @throws NullPointerException if the specified key or value is null
1518		*/
1519	<	@SuppressWarnings("unchecked") public V putIfAbsent(K key, V value) {
1519	>	public V replace(K key, V value) {
1520		if (key == null || value == null)
1521		throw new NullPointerException();
1522	<	return (V)internalPutIfAbsent(key, value);
1522	>	return replaceNode(key, value, null);
1523		}
1524
1525	+	// Overrides of JDK8+ Map extension method defaults
1526	+
1527		/**
1528	<	* Copies all of the mappings from the specified map to this one.
1529	<	* These mappings replace any mappings that this map had for any of the
1530	<	* keys currently in the specified map.
1528	>	* Returns the value to which the specified key is mapped, or the
1529	>	* given default value if this map contains no mapping for the
1530	>	* key.
1531		*
1532	<	* @param m mappings to be stored in this map
1532	>	* @param key the key whose associated value is to be returned
1533	>	* @param defaultValue the value to return if this map contains
1534	>	* no mapping for the given key
1535	>	* @return the mapping for the key, if present; else the default value
1536	>	* @throws NullPointerException if the specified key is null
1537		*/
1538	<	public void putAll(Map<? extends K, ? extends V> m) {
1539	<	internalPutAll(m);
1538	>	public V getOrDefault(Object key, V defaultValue) {
1539	>	V v;
1540	>	return (v = get(key)) == null ? defaultValue : v;
1541	>	}
1542	>
1543	>	public void forEach(BiConsumer<? super K, ? super V> action) {
1544	>	if (action == null) throw new NullPointerException();
1545	>	Node<K,V>[] t;
1546	>	if ((t = table) != null) {
1547	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1548	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1549	>	action.accept(p.key, p.val);
1550	>	}
1551	>	}
1552	>	}
1553	>
1554	>	public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {
1555	>	if (function == null) throw new NullPointerException();
1556	>	Node<K,V>[] t;
1557	>	if ((t = table) != null) {
1558	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1559	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1560	>	V oldValue = p.val;
1561	>	for (K key = p.key;;) {
1562	>	V newValue = function.apply(key, oldValue);
1563	>	if (newValue == null)
1564	>	throw new NullPointerException();
1565	>	if (replaceNode(key, newValue, oldValue) != null ||
1566	>	(oldValue = get(key)) == null)
1567	>	break;
1568	>	}
1569	>	}
1570	>	}
1571		}
1572
1573		/**
1574		* If the specified key is not already associated with a value,
1575	<	* computes its value using the given mappingFunction and enters
1576	<	* it into the map unless null.  This is equivalent to
1577	<	* <pre> {@code
1578	<	* if (map.containsKey(key))
1579	<	*   return map.get(key);
1580	<	* value = mappingFunction.apply(key);
1581	<	* 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>
1575	>	* attempts to compute its value using the given mapping function
1576	>	* and enters it into this map unless {@code null}.  The entire
1577	>	* method invocation is performed atomically, so the function is
1578	>	* applied at most once per key.  Some attempted update operations
1579	>	* on this map by other threads may be blocked while computation
1580	>	* is in progress, so the computation should be short and simple,
1581	>	* and must not attempt to update any other mappings of this map.
1582		*
1583		* @param key key with which the specified value is to be associated
1584		* @param mappingFunction the function to compute a value
#	Line 2797 | Line 1592 | public class ConcurrentHashMap<K, V>
1592		* @throws RuntimeException or Error if the mappingFunction does so,
1593		*         in which case the mapping is left unestablished
1594		*/
1595	<	@SuppressWarnings("unchecked") public V computeIfAbsent
2801	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
1595	>	public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
1596		if (key == null || mappingFunction == null)
1597		throw new NullPointerException();
1598	<	return (V)internalComputeIfAbsent(key, mappingFunction);
1598	>	int h = spread(key.hashCode());
1599	>	V val = null;
1600	>	int binCount = 0;
1601	>	for (Node<K,V>[] tab = table;;) {
1602	>	Node<K,V> f; int n, i, fh;
1603	>	if (tab == null || (n = tab.length) == 0)
1604	>	tab = initTable();
1605	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1606	>	Node<K,V> r = new ReservationNode<K,V>();
1607	>	synchronized (r) {
1608	>	if (casTabAt(tab, i, null, r)) {
1609	>	binCount = 1;
1610	>	Node<K,V> node = null;
1611	>	try {
1612	>	if ((val = mappingFunction.apply(key)) != null)
1613	>	node = new Node<K,V>(h, key, val, null);
1614	>	} finally {
1615	>	setTabAt(tab, i, node);
1616	>	}
1617	>	}
1618	>	}
1619	>	if (binCount != 0)
1620	>	break;
1621	>	}
1622	>	else if ((fh = f.hash) == MOVED)
1623	>	tab = helpTransfer(tab, f);
1624	>	else {
1625	>	boolean added = false;
1626	>	synchronized (f) {
1627	>	if (tabAt(tab, i) == f) {
1628	>	if (fh >= 0) {
1629	>	binCount = 1;
1630	>	for (Node<K,V> e = f;; ++binCount) {
1631	>	K ek; V ev;
1632	>	if (e.hash == h &&
1633	>	((ek = e.key) == key ||
1634	>	(ek != null && key.equals(ek)))) {
1635	>	val = e.val;
1636	>	break;
1637	>	}
1638	>	Node<K,V> pred = e;
1639	>	if ((e = e.next) == null) {
1640	>	if ((val = mappingFunction.apply(key)) != null) {
1641	>	added = true;
1642	>	pred.next = new Node<K,V>(h, key, val, null);
1643	>	}
1644	>	break;
1645	>	}
1646	>	}
1647	>	}
1648	>	else if (f instanceof TreeBin) {
1649	>	binCount = 2;
1650	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1651	>	TreeNode<K,V> r, p;
1652	>	if ((r = t.root) != null &&
1653	>	(p = r.findTreeNode(h, key, null)) != null)
1654	>	val = p.val;
1655	>	else if ((val = mappingFunction.apply(key)) != null) {
1656	>	added = true;
1657	>	t.putTreeVal(h, key, val);
1658	>	}
1659	>	}
1660	>	}
1661	>	}
1662	>	if (binCount != 0) {
1663	>	if (binCount >= TREEIFY_THRESHOLD)
1664	>	treeifyBin(tab, i);
1665	>	if (!added)
1666	>	return val;
1667	>	break;
1668	>	}
1669	>	}
1670	>	}
1671	>	if (val != null)
1672	>	addCount(1L, binCount);
1673	>	return val;
1674		}
1675
1676		/**
1677	<	* If the given key is present, computes a new mapping value given a key and
1678	<	* its current mapped value. This is equivalent to
1679	<	*  <pre> {@code
1680	<	*   if (map.containsKey(key)) {
1681	<	*     value = remappingFunction.apply(key, map.get(key));
1682	<	*     if (value != null)
1683	<	*       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:
1677	>	* If the value for the specified key is present, attempts to
1678	>	* compute a new mapping given the key and its current mapped
1679	>	* value.  The entire method invocation is performed atomically.
1680	>	* Some attempted update operations on this map by other threads
1681	>	* may be blocked while computation is in progress, so the
1682	>	* computation should be short and simple, and must not attempt to
1683	>	* update any other mappings of this map.
1684		*
1685	<	* @param key key with which the specified value is to be associated
1685	>	* @param key key with which a value may be associated
1686		* @param remappingFunction the function to compute a value
1687		* @return the new value associated with the specified key, or null if none
1688		* @throws NullPointerException if the specified key or remappingFunction
#	Line 2838 | Line 1693 | public class ConcurrentHashMap<K, V>
1693		* @throws RuntimeException or Error if the remappingFunction does so,
1694		*         in which case the mapping is unchanged
1695		*/
1696	<	@SuppressWarnings("unchecked") public V computeIfPresent
2842	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1696	>	public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
1697		if (key == null || remappingFunction == null)
1698		throw new NullPointerException();
1699	<	return (V)internalCompute(key, true, remappingFunction);
1699	>	int h = spread(key.hashCode());
1700	>	V val = null;
1701	>	int delta = 0;
1702	>	int binCount = 0;
1703	>	for (Node<K,V>[] tab = table;;) {
1704	>	Node<K,V> f; int n, i, fh;
1705	>	if (tab == null || (n = tab.length) == 0)
1706	>	tab = initTable();
1707	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1708	>	break;
1709	>	else if ((fh = f.hash) == MOVED)
1710	>	tab = helpTransfer(tab, f);
1711	>	else {
1712	>	synchronized (f) {
1713	>	if (tabAt(tab, i) == f) {
1714	>	if (fh >= 0) {
1715	>	binCount = 1;
1716	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1717	>	K ek;
1718	>	if (e.hash == h &&
1719	>	((ek = e.key) == key ||
1720	>	(ek != null && key.equals(ek)))) {
1721	>	val = remappingFunction.apply(key, e.val);
1722	>	if (val != null)
1723	>	e.val = val;
1724	>	else {
1725	>	delta = -1;
1726	>	Node<K,V> en = e.next;
1727	>	if (pred != null)
1728	>	pred.next = en;
1729	>	else
1730	>	setTabAt(tab, i, en);
1731	>	}
1732	>	break;
1733	>	}
1734	>	pred = e;
1735	>	if ((e = e.next) == null)
1736	>	break;
1737	>	}
1738	>	}
1739	>	else if (f instanceof TreeBin) {
1740	>	binCount = 2;
1741	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1742	>	TreeNode<K,V> r, p;
1743	>	if ((r = t.root) != null &&
1744	>	(p = r.findTreeNode(h, key, null)) != null) {
1745	>	val = remappingFunction.apply(key, p.val);
1746	>	if (val != null)
1747	>	p.val = val;
1748	>	else {
1749	>	delta = -1;
1750	>	if (t.removeTreeNode(p))
1751	>	setTabAt(tab, i, untreeify(t.first));
1752	>	}
1753	>	}
1754	>	}
1755	>	}
1756	>	}
1757	>	if (binCount != 0)
1758	>	break;
1759	>	}
1760	>	}
1761	>	if (delta != 0)
1762	>	addCount((long)delta, binCount);
1763	>	return val;
1764		}
1765
1766		/**
1767	<	* Computes a new mapping value given a key and
1768	<	* its current mapped value (or {@code null} if there is no current
1769	<	* mapping). This is equivalent to
1770	<	*  <pre> {@code
1771	<	*   value = remappingFunction.apply(key, map.get(key));
1772	<	*   if (value != null)
1773	<	*     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>
1767	>	* Attempts to compute a mapping for the specified key and its
1768	>	* current mapped value (or {@code null} if there is no current
1769	>	* mapping). The entire method invocation is performed atomically.
1770	>	* Some attempted update operations on this map by other threads
1771	>	* may be blocked while computation is in progress, so the
1772	>	* computation should be short and simple, and must not attempt to
1773	>	* update any other mappings of this Map.
1774		*
1775		* @param key key with which the specified value is to be associated
1776		* @param remappingFunction the function to compute a value
#	Line 2885 | Line 1783 | public class ConcurrentHashMap<K, V>
1783		* @throws RuntimeException or Error if the remappingFunction does so,
1784		*         in which case the mapping is unchanged
1785		*/
1786	<	@SuppressWarnings("unchecked") public V compute
1787	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1786	>	public V compute(K key,
1787	>	BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
1788		if (key == null || remappingFunction == null)
1789		throw new NullPointerException();
1790	<	return (V)internalCompute(key, false, remappingFunction);
1790	>	int h = spread(key.hashCode());
1791	>	V val = null;
1792	>	int delta = 0;
1793	>	int binCount = 0;
1794	>	for (Node<K,V>[] tab = table;;) {
1795	>	Node<K,V> f; int n, i, fh;
1796	>	if (tab == null || (n = tab.length) == 0)
1797	>	tab = initTable();
1798	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1799	>	Node<K,V> r = new ReservationNode<K,V>();
1800	>	synchronized (r) {
1801	>	if (casTabAt(tab, i, null, r)) {
1802	>	binCount = 1;
1803	>	Node<K,V> node = null;
1804	>	try {
1805	>	if ((val = remappingFunction.apply(key, null)) != null) {
1806	>	delta = 1;
1807	>	node = new Node<K,V>(h, key, val, null);
1808	>	}
1809	>	} finally {
1810	>	setTabAt(tab, i, node);
1811	>	}
1812	>	}
1813	>	}
1814	>	if (binCount != 0)
1815	>	break;
1816	>	}
1817	>	else if ((fh = f.hash) == MOVED)
1818	>	tab = helpTransfer(tab, f);
1819	>	else {
1820	>	synchronized (f) {
1821	>	if (tabAt(tab, i) == f) {
1822	>	if (fh >= 0) {
1823	>	binCount = 1;
1824	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1825	>	K ek;
1826	>	if (e.hash == h &&
1827	>	((ek = e.key) == key ||
1828	>	(ek != null && key.equals(ek)))) {
1829	>	val = remappingFunction.apply(key, e.val);
1830	>	if (val != null)
1831	>	e.val = val;
1832	>	else {
1833	>	delta = -1;
1834	>	Node<K,V> en = e.next;
1835	>	if (pred != null)
1836	>	pred.next = en;
1837	>	else
1838	>	setTabAt(tab, i, en);
1839	>	}
1840	>	break;
1841	>	}
1842	>	pred = e;
1843	>	if ((e = e.next) == null) {
1844	>	val = remappingFunction.apply(key, null);
1845	>	if (val != null) {
1846	>	delta = 1;
1847	>	pred.next =
1848	>	new Node<K,V>(h, key, val, null);
1849	>	}
1850	>	break;
1851	>	}
1852	>	}
1853	>	}
1854	>	else if (f instanceof TreeBin) {
1855	>	binCount = 1;
1856	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1857	>	TreeNode<K,V> r, p;
1858	>	if ((r = t.root) != null)
1859	>	p = r.findTreeNode(h, key, null);
1860	>	else
1861	>	p = null;
1862	>	V pv = (p == null) ? null : p.val;
1863	>	val = remappingFunction.apply(key, pv);
1864	>	if (val != null) {
1865	>	if (p != null)
1866	>	p.val = val;
1867	>	else {
1868	>	delta = 1;
1869	>	t.putTreeVal(h, key, val);
1870	>	}
1871	>	}
1872	>	else if (p != null) {
1873	>	delta = -1;
1874	>	if (t.removeTreeNode(p))
1875	>	setTabAt(tab, i, untreeify(t.first));
1876	>	}
1877	>	}
1878	>	}
1879	>	}
1880	>	if (binCount != 0) {
1881	>	if (binCount >= TREEIFY_THRESHOLD)
1882	>	treeifyBin(tab, i);
1883	>	break;
1884	>	}
1885	>	}
1886	>	}
1887	>	if (delta != 0)
1888	>	addCount((long)delta, binCount);
1889	>	return val;
1890		}
1891
1892		/**
1893	<	* If the specified key is not already associated
1894	<	* with a value, associate it with the given value.
1895	<	* Otherwise, replace the value with the results of
1896	<	* the given remapping function. This is equivalent to:
1897	<	*  <pre> {@code
1898	<	*   if (!map.containsKey(key))
1899	<	*     map.put(value);
1900	<	*   else {
1901	<	*     newValue = remappingFunction.apply(map.get(key), value);
1902	<	*     if (value != null)
1903	<	*       map.put(key, value);
1904	<	*     else
1905	<	*       map.remove(key);
1906	<	*   }
1907	<	* }</pre>
1908	<	* except that the action is performed atomically.  If the
1909	<	* function returns {@code null}, the mapping is removed.  If the
1910	<	* 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.
1893	>	* If the specified key is not already associated with a
1894	>	* (non-null) value, associates it with the given value.
1895	>	* Otherwise, replaces the value with the results of the given
1896	>	* remapping function, or removes if {@code null}. The entire
1897	>	* method invocation is performed atomically.  Some attempted
1898	>	* update operations on this map by other threads may be blocked
1899	>	* while computation is in progress, so the computation should be
1900	>	* short and simple, and must not attempt to update any other
1901	>	* mappings of this Map.
1902	>	*
1903	>	* @param key key with which the specified value is to be associated
1904	>	* @param value the value to use if absent
1905	>	* @param remappingFunction the function to recompute a value if present
1906	>	* @return the new value associated with the specified key, or null if none
1907	>	* @throws NullPointerException if the specified key or the
1908	>	*         remappingFunction is null
1909	>	* @throws RuntimeException or Error if the remappingFunction does so,
1910	>	*         in which case the mapping is unchanged
1911		*/
1912	<	@SuppressWarnings("unchecked") public V merge
2921	<	(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1912	>	public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
1913		if (key == null || value == null || remappingFunction == null)
1914		throw new NullPointerException();
1915	<	return (V)internalMerge(key, value, remappingFunction);
1915	>	int h = spread(key.hashCode());
1916	>	V val = null;
1917	>	int delta = 0;
1918	>	int binCount = 0;
1919	>	for (Node<K,V>[] tab = table;;) {
1920	>	Node<K,V> f; int n, i, fh;
1921	>	if (tab == null || (n = tab.length) == 0)
1922	>	tab = initTable();
1923	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1924	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1925	>	delta = 1;
1926	>	val = value;
1927	>	break;
1928	>	}
1929	>	}
1930	>	else if ((fh = f.hash) == MOVED)
1931	>	tab = helpTransfer(tab, f);
1932	>	else {
1933	>	synchronized (f) {
1934	>	if (tabAt(tab, i) == f) {
1935	>	if (fh >= 0) {
1936	>	binCount = 1;
1937	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1938	>	K ek;
1939	>	if (e.hash == h &&
1940	>	((ek = e.key) == key ||
1941	>	(ek != null && key.equals(ek)))) {
1942	>	val = remappingFunction.apply(e.val, value);
1943	>	if (val != null)
1944	>	e.val = val;
1945	>	else {
1946	>	delta = -1;
1947	>	Node<K,V> en = e.next;
1948	>	if (pred != null)
1949	>	pred.next = en;
1950	>	else
1951	>	setTabAt(tab, i, en);
1952	>	}
1953	>	break;
1954	>	}
1955	>	pred = e;
1956	>	if ((e = e.next) == null) {
1957	>	delta = 1;
1958	>	val = value;
1959	>	pred.next =
1960	>	new Node<K,V>(h, key, val, null);
1961	>	break;
1962	>	}
1963	>	}
1964	>	}
1965	>	else if (f instanceof TreeBin) {
1966	>	binCount = 2;
1967	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1968	>	TreeNode<K,V> r = t.root;
1969	>	TreeNode<K,V> p = (r == null) ? null :
1970	>	r.findTreeNode(h, key, null);
1971	>	val = (p == null) ? value :
1972	>	remappingFunction.apply(p.val, value);
1973	>	if (val != null) {
1974	>	if (p != null)
1975	>	p.val = val;
1976	>	else {
1977	>	delta = 1;
1978	>	t.putTreeVal(h, key, val);
1979	>	}
1980	>	}
1981	>	else if (p != null) {
1982	>	delta = -1;
1983	>	if (t.removeTreeNode(p))
1984	>	setTabAt(tab, i, untreeify(t.first));
1985	>	}
1986	>	}
1987	>	}
1988	>	}
1989	>	if (binCount != 0) {
1990	>	if (binCount >= TREEIFY_THRESHOLD)
1991	>	treeifyBin(tab, i);
1992	>	break;
1993	>	}
1994	>	}
1995	>	}
1996	>	if (delta != 0)
1997	>	addCount((long)delta, binCount);
1998	>	return val;
1999		}
2000
2001	+	// Hashtable legacy methods
2002	+
2003		/**
2004	<	* Removes the key (and its corresponding value) from this map.
2005	<	* This method does nothing if the key is not in the map.
2004	>	* Legacy method testing if some key maps into the specified value
2005	>	* in this table.
2006		*
2007	<	* @param  key the key that needs to be removed
2008	<	* @return the previous value associated with {@code key}, or
2009	<	*         {@code null} if there was no mapping for {@code key}
2010	<	* @throws NullPointerException if the specified key is null
2007	>	* @deprecated This method is identical in functionality to
2008	>	* {@link #containsValue(Object)}, and exists solely to ensure
2009	>	* full compatibility with class {@link java.util.Hashtable},
2010	>	* which supported this method prior to introduction of the
2011	>	* Java Collections framework.
2012	>	*
2013	>	* @param  value a value to search for
2014	>	* @return {@code true} if and only if some key maps to the
2015	>	*         {@code value} argument in this table as
2016	>	*         determined by the {@code equals} method;
2017	>	*         {@code false} otherwise
2018	>	* @throws NullPointerException if the specified value is null
2019		*/
2020	<	@SuppressWarnings("unchecked") public V remove(Object key) {
2021	<	if (key == null)
2022	<	throw new NullPointerException();
2939	<	return (V)internalReplace(key, null, null);
2020	>	@Deprecated
2021	>	public boolean contains(Object value) {
2022	>	return containsValue(value);
2023		}
2024
2025		/**
2026	<	* {@inheritDoc}
2026	>	* Returns an enumeration of the keys in this table.
2027		*
2028	<	* @throws NullPointerException if the specified key is null
2028	>	* @return an enumeration of the keys in this table
2029	>	* @see #keySet()
2030		*/
2031	<	public boolean remove(Object key, Object value) {
2032	<	if (key == null)
2033	<	throw new NullPointerException();
2034	<	if (value == null)
2951	<	return false;
2952	<	return internalReplace(key, null, value) != null;
2031	>	public Enumeration<K> keys() {
2032	>	Node<K,V>[] t;
2033	>	int f = (t = table) == null ? 0 : t.length;
2034	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2035		}
2036
2037		/**
2038	<	* {@inheritDoc}
2038	>	* Returns an enumeration of the values in this table.
2039		*
2040	<	* @throws NullPointerException if any of the arguments are null
2040	>	* @return an enumeration of the values in this table
2041	>	* @see #values()
2042		*/
2043	<	public boolean replace(K key, V oldValue, V newValue) {
2044	<	if (key == null || oldValue == null || newValue == null)
2045	<	throw new NullPointerException();
2046	<	return internalReplace(key, newValue, oldValue) != null;
2043	>	public Enumeration<V> elements() {
2044	>	Node<K,V>[] t;
2045	>	int f = (t = table) == null ? 0 : t.length;
2046	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2047		}
2048
2049	+	// ConcurrentHashMap-only methods
2050	+
2051		/**
2052	<	* {@inheritDoc}
2052	>	* Returns the number of mappings. This method should be used
2053	>	* instead of {@link #size} because a ConcurrentHashMap may
2054	>	* contain more mappings than can be represented as an int. The
2055	>	* value returned is an estimate; the actual count may differ if
2056	>	* there are concurrent insertions or removals.
2057		*
2058	<	* @return the previous value associated with the specified key,
2059	<	*         or {@code null} if there was no mapping for the key
2971	<	* @throws NullPointerException if the specified key or value is null
2058	>	* @return the number of mappings
2059	>	* @since 1.8
2060		*/
2061	<	@SuppressWarnings("unchecked") public V replace(K key, V value) {
2062	<	if (key == null || value == null)
2063	<	throw new NullPointerException();
2976	<	return (V)internalReplace(key, value, null);
2061	>	public long mappingCount() {
2062	>	long n = sumCount();
2063	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2064		}
2065
2066		/**
2067	<	* Removes all of the mappings from this map.
2067	>	* Creates a new {@link Set} backed by a ConcurrentHashMap
2068	>	* from the given type to {@code Boolean.TRUE}.
2069	>	*
2070	>	* @param <K> the element type of the returned set
2071	>	* @return the new set
2072	>	* @since 1.8
2073		*/
2074	<	public void clear() {
2075	<	internalClear();
2074	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2075	>	return new KeySetView<K,Boolean>
2076	>	(new ConcurrentHashMap<K,Boolean>(), Boolean.TRUE);
2077		}
2078
2079		/**
2080	<	* Returns a {@link Set} view of the keys contained in this map.
2081	<	* The set is backed by the map, so changes to the map are
2989	<	* reflected in the set, and vice-versa.
2080	>	* Creates a new {@link Set} backed by a ConcurrentHashMap
2081	>	* from the given type to {@code Boolean.TRUE}.
2082		*
2083	<	* @return the set view
2083	>	* @param initialCapacity The implementation performs internal
2084	>	* sizing to accommodate this many elements.
2085	>	* @param <K> the element type of the returned set
2086	>	* @return the new set
2087	>	* @throws IllegalArgumentException if the initial capacity of
2088	>	* elements is negative
2089	>	* @since 1.8
2090		*/
2091	<	public KeySetView<K,V> keySet() {
2092	<	KeySetView<K,V> ks = keySet;
2093	<	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2091	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2092	>	return new KeySetView<K,Boolean>
2093	>	(new ConcurrentHashMap<K,Boolean>(initialCapacity), Boolean.TRUE);
2094		}
2095
2096		/**
2097		* Returns a {@link Set} view of the keys in this map, using the
2098		* given common mapped value for any additions (i.e., {@link
2099	<	* Collection#add} and {@link Collection#addAll}). This is of
2100	<	* course only appropriate if it is acceptable to use the same
2101	<	* value for all additions from this view.
2099	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2100	>	* This is of course only appropriate if it is acceptable to use
2101	>	* the same value for all additions from this view.
2102		*
2103	<	* @param mappedValue the mapped value to use for any
3006	<	* additions.
2103	>	* @param mappedValue the mapped value to use for any additions
2104		* @return the set view
2105		* @throws NullPointerException if the mappedValue is null
2106		*/
#	Line 3013 | Line 2110 | public class ConcurrentHashMap<K, V>
2110		return new KeySetView<K,V>(this, mappedValue);
2111		}
2112
2113	+	/* ---------------- Special Nodes -------------- */
2114	+
2115		/**
2116	<	* 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.
2116	>	* A node inserted at head of bins during transfer operations.
2117		*/
2118	<	public ValuesView<K,V> values() {
2119	<	ValuesView<K,V> vs = values;
2120	<	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
2118	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2119	>	final Node<K,V>[] nextTable;
2120	>	ForwardingNode(Node<K,V>[] tab) {
2121	>	super(MOVED, null, null, null);
2122	>	this.nextTable = tab;
2123	>	}
2124	>
2125	>	Node<K,V> find(int h, Object k) {
2126	>	// loop to avoid arbitrarily deep recursion on forwarding nodes
2127	>	outer: for (Node<K,V>[] tab = nextTable;;) {
2128	>	Node<K,V> e; int n;
2129	>	if (k == null || tab == null || (n = tab.length) == 0 ||
2130	>	(e = tabAt(tab, (n - 1) & h)) == null)
2131	>	return null;
2132	>	for (;;) {
2133	>	int eh; K ek;
2134	>	if ((eh = e.hash) == h &&
2135	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2136	>	return e;
2137	>	if (eh < 0) {
2138	>	if (e instanceof ForwardingNode) {
2139	>	tab = ((ForwardingNode<K,V>)e).nextTable;
2140	>	continue outer;
2141	>	}
2142	>	else
2143	>	return e.find(h, k);
2144	>	}
2145	>	if ((e = e.next) == null)
2146	>	return null;
2147	>	}
2148	>	}
2149	>	}
2150		}
2151
2152		/**
2153	<	* 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.
2153	>	* A place-holder node used in computeIfAbsent and compute
2154		*/
2155	<	public Set<Map.Entry<K,V>> entrySet() {
2156	<	EntrySetView<K,V> es = entrySet;
2157	<	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
2155	>	static final class ReservationNode<K,V> extends Node<K,V> {
2156	>	ReservationNode() {
2157	>	super(RESERVED, null, null, null);
2158	>	}
2159	>
2160	>	Node<K,V> find(int h, Object k) {
2161	>	return null;
2162	>	}
2163		}
2164
2165	+	/* ---------------- Table Initialization and Resizing -------------- */
2166	+
2167		/**
2168	<	* Returns an enumeration of the keys in this table.
3049	<	*
3050	<	* @return an enumeration of the keys in this table
3051	<	* @see #keySet()
2168	>	* Initializes table, using the size recorded in sizeCtl.
2169		*/
2170	<	public Enumeration<K> keys() {
2171	<	return new KeyIterator<K,V>(this);
2170	>	private final Node<K,V>[] initTable() {
2171	>	Node<K,V>[] tab; int sc;
2172	>	while ((tab = table) == null || tab.length == 0) {
2173	>	if ((sc = sizeCtl) < 0)
2174	>	Thread.yield(); // lost initialization race; just spin
2175	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2176	>	try {
2177	>	if ((tab = table) == null || tab.length == 0) {
2178	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2179	>	@SuppressWarnings("unchecked")
2180	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2181	>	table = tab = nt;
2182	>	sc = n - (n >>> 2);
2183	>	}
2184	>	} finally {
2185	>	sizeCtl = sc;
2186	>	}
2187	>	break;
2188	>	}
2189	>	}
2190	>	return tab;
2191		}
2192
2193		/**
2194	<	* Returns an enumeration of the values in this table.
2195	<	*
2196	<	* @return an enumeration of the values in this table
2197	<	* @see #values()
2194	>	* Adds to count, and if table is too small and not already
2195	>	* resizing, initiates transfer. If already resizing, helps
2196	>	* perform transfer if work is available.  Rechecks occupancy
2197	>	* after a transfer to see if another resize is already needed
2198	>	* because resizings are lagging additions.
2199	>	*
2200	>	* @param x the count to add
2201	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
2202	>	*/
2203	>	private final void addCount(long x, int check) {
2204	>	CounterCell[] as; long b, s;
2205	>	if ((as = counterCells) != null ||
2206	>	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2207	>	CounterCell a; long v; int m;
2208	>	boolean uncontended = true;
2209	>	if (as == null || (m = as.length - 1) < 0 ||
2210	>	(a = as[ThreadLocalRandom.getProbe() & m]) == null ||
2211	>	!(uncontended =
2212	>	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
2213	>	fullAddCount(x, uncontended);
2214	>	return;
2215	>	}
2216	>	if (check <= 1)
2217	>	return;
2218	>	s = sumCount();
2219	>	}
2220	>	if (check >= 0) {
2221	>	Node<K,V>[] tab, nt; int sc;
2222	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2223	>	tab.length < MAXIMUM_CAPACITY) {
2224	>	if (sc < 0) {
2225	>	if (sc == -1 || transferIndex <= 0 ||
2226	>	(nt = nextTable) == null)
2227	>	break;
2228	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2229	>	transfer(tab, nt);
2230	>	}
2231	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -2))
2232	>	transfer(tab, null);
2233	>	s = sumCount();
2234	>	}
2235	>	}
2236	>	}
2237	>
2238	>	/**
2239	>	* Helps transfer if a resize is in progress.
2240		*/
2241	<	public Enumeration<V> elements() {
2242	<	return new ValueIterator<K,V>(this);
2241	>	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2242	>	Node<K,V>[] nextTab; int sc;
2243	>	if ((f instanceof ForwardingNode) &&
2244	>	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2245	>	while (transferIndex > 0 && nextTab == nextTable &&
2246	>	(sc = sizeCtl) < -1) {
2247	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1)) {
2248	>	transfer(tab, nextTab);
2249	>	break;
2250	>	}
2251	>	}
2252	>	return nextTab;
2253	>	}
2254	>	return table;
2255		}
2256
2257		/**
2258	<	* Returns a partitionable iterator of the keys in this map.
2258	>	* Tries to presize table to accommodate the given number of elements.
2259		*
2260	<	* @return a partitionable iterator of the keys in this map
2260	>	* @param size number of elements (doesn't need to be perfectly accurate)
2261		*/
2262	<	public Spliterator<K> keySpliterator() {
2263	<	return new KeyIterator<K,V>(this);
2262	>	private final void tryPresize(int size) {
2263	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2264	>	tableSizeFor(size + (size >>> 1) + 1);
2265	>	int sc;
2266	>	while ((sc = sizeCtl) >= 0) {
2267	>	Node<K,V>[] tab = table; int n;
2268	>	if (tab == null || (n = tab.length) == 0) {
2269	>	n = (sc > c) ? sc : c;
2270	>	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2271	>	try {
2272	>	if (table == tab) {
2273	>	@SuppressWarnings("unchecked")
2274	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2275	>	table = nt;
2276	>	sc = n - (n >>> 2);
2277	>	}
2278	>	} finally {
2279	>	sizeCtl = sc;
2280	>	}
2281	>	}
2282	>	}
2283	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2284	>	break;
2285	>	else if (tab == table &&
2286	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2287	>	transfer(tab, null);
2288	>	}
2289		}
2290
2291		/**
2292	<	* Returns a partitionable iterator of the values in this map.
2293	<	*
3079	<	* @return a partitionable iterator of the values in this map
2292	>	* Moves and/or copies the nodes in each bin to new table. See
2293	>	* above for explanation.
2294		*/
2295	<	public Spliterator<V> valueSpliterator() {
2296	<	return new ValueIterator<K,V>(this);
2295	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2296	>	int n = tab.length, stride;
2297	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2298	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
2299	>	if (nextTab == null) {            // initiating
2300	>	try {
2301	>	@SuppressWarnings("unchecked")
2302	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n << 1];
2303	>	nextTab = nt;
2304	>	} catch (Throwable ex) {      // try to cope with OOME
2305	>	sizeCtl = Integer.MAX_VALUE;
2306	>	return;
2307	>	}
2308	>	nextTable = nextTab;
2309	>	transferIndex = n;
2310	>	}
2311	>	int nextn = nextTab.length;
2312	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2313	>	boolean advance = true;
2314	>	boolean finishing = false; // to ensure sweep before committing nextTab
2315	>	for (int i = 0, bound = 0;;) {
2316	>	Node<K,V> f; int fh;
2317	>	while (advance) {
2318	>	int nextIndex, nextBound;
2319	>	if (--i >= bound || finishing)
2320	>	advance = false;
2321	>	else if ((nextIndex = transferIndex) <= 0) {
2322	>	i = -1;
2323	>	advance = false;
2324	>	}
2325	>	else if (U.compareAndSwapInt
2326	>	(this, TRANSFERINDEX, nextIndex,
2327	>	nextBound = (nextIndex > stride ?
2328	>	nextIndex - stride : 0))) {
2329	>	bound = nextBound;
2330	>	i = nextIndex - 1;
2331	>	advance = false;
2332	>	}
2333	>	}
2334	>	if (i < 0 || i >= n || i + n >= nextn) {
2335	>	int sc;
2336	>	if (finishing) {
2337	>	nextTable = null;
2338	>	table = nextTab;
2339	>	sizeCtl = (n << 1) - (n >>> 1);
2340	>	return;
2341	>	}
2342	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, ++sc)) {
2343	>	if (sc != -1)
2344	>	return;
2345	>	finishing = advance = true;
2346	>	i = n; // recheck before commit
2347	>	}
2348	>	}
2349	>	else if ((f = tabAt(tab, i)) == null)
2350	>	advance = casTabAt(tab, i, null, fwd);
2351	>	else if ((fh = f.hash) == MOVED)
2352	>	advance = true; // already processed
2353	>	else {
2354	>	synchronized (f) {
2355	>	if (tabAt(tab, i) == f) {
2356	>	Node<K,V> ln, hn;
2357	>	if (fh >= 0) {
2358	>	int runBit = fh & n;
2359	>	Node<K,V> lastRun = f;
2360	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2361	>	int b = p.hash & n;
2362	>	if (b != runBit) {
2363	>	runBit = b;
2364	>	lastRun = p;
2365	>	}
2366	>	}
2367	>	if (runBit == 0) {
2368	>	ln = lastRun;
2369	>	hn = null;
2370	>	}
2371	>	else {
2372	>	hn = lastRun;
2373	>	ln = null;
2374	>	}
2375	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2376	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2377	>	if ((ph & n) == 0)
2378	>	ln = new Node<K,V>(ph, pk, pv, ln);
2379	>	else
2380	>	hn = new Node<K,V>(ph, pk, pv, hn);
2381	>	}
2382	>	setTabAt(nextTab, i, ln);
2383	>	setTabAt(nextTab, i + n, hn);
2384	>	setTabAt(tab, i, fwd);
2385	>	advance = true;
2386	>	}
2387	>	else if (f instanceof TreeBin) {
2388	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2389	>	TreeNode<K,V> lo = null, loTail = null;
2390	>	TreeNode<K,V> hi = null, hiTail = null;
2391	>	int lc = 0, hc = 0;
2392	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2393	>	int h = e.hash;
2394	>	TreeNode<K,V> p = new TreeNode<K,V>
2395	>	(h, e.key, e.val, null, null);
2396	>	if ((h & n) == 0) {
2397	>	if ((p.prev = loTail) == null)
2398	>	lo = p;
2399	>	else
2400	>	loTail.next = p;
2401	>	loTail = p;
2402	>	++lc;
2403	>	}
2404	>	else {
2405	>	if ((p.prev = hiTail) == null)
2406	>	hi = p;
2407	>	else
2408	>	hiTail.next = p;
2409	>	hiTail = p;
2410	>	++hc;
2411	>	}
2412	>	}
2413	>	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2414	>	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2415	>	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2416	>	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2417	>	setTabAt(nextTab, i, ln);
2418	>	setTabAt(nextTab, i + n, hn);
2419	>	setTabAt(tab, i, fwd);
2420	>	advance = true;
2421	>	}
2422	>	}
2423	>	}
2424	>	}
2425	>	}
2426		}
2427
2428	+	/* ---------------- Counter support -------------- */
2429	+
2430		/**
2431	<	* Returns a partitionable iterator of the entries in this map.
2432	<	*
3088	<	* @return a partitionable iterator of the entries in this map
2431	>	* A padded cell for distributing counts.  Adapted from LongAdder
2432	>	* and Striped64.  See their internal docs for explanation.
2433		*/
2434	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2435	<	return new EntryIterator<K,V>(this);
2434	>	@sun.misc.Contended static final class CounterCell {
2435	>	volatile long value;
2436	>	CounterCell(long x) { value = x; }
2437	>	}
2438	>
2439	>	final long sumCount() {
2440	>	CounterCell[] as = counterCells; CounterCell a;
2441	>	long sum = baseCount;
2442	>	if (as != null) {
2443	>	for (int i = 0; i < as.length; ++i) {
2444	>	if ((a = as[i]) != null)
2445	>	sum += a.value;
2446	>	}
2447	>	}
2448	>	return sum;
2449	>	}
2450	>
2451	>	// See LongAdder version for explanation
2452	>	private final void fullAddCount(long x, boolean wasUncontended) {
2453	>	int h;
2454	>	if ((h = ThreadLocalRandom.getProbe()) == 0) {
2455	>	ThreadLocalRandom.localInit();      // force initialization
2456	>	h = ThreadLocalRandom.getProbe();
2457	>	wasUncontended = true;
2458	>	}
2459	>	boolean collide = false;                // True if last slot nonempty
2460	>	for (;;) {
2461	>	CounterCell[] as; CounterCell a; int n; long v;
2462	>	if ((as = counterCells) != null && (n = as.length) > 0) {
2463	>	if ((a = as[(n - 1) & h]) == null) {
2464	>	if (cellsBusy == 0) {            // Try to attach new Cell
2465	>	CounterCell r = new CounterCell(x); // Optimistic create
2466	>	if (cellsBusy == 0 &&
2467	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
2468	>	boolean created = false;
2469	>	try {               // Recheck under lock
2470	>	CounterCell[] rs; int m, j;
2471	>	if ((rs = counterCells) != null &&
2472	>	(m = rs.length) > 0 &&
2473	>	rs[j = (m - 1) & h] == null) {
2474	>	rs[j] = r;
2475	>	created = true;
2476	>	}
2477	>	} finally {
2478	>	cellsBusy = 0;
2479	>	}
2480	>	if (created)
2481	>	break;
2482	>	continue;           // Slot is now non-empty
2483	>	}
2484	>	}
2485	>	collide = false;
2486	>	}
2487	>	else if (!wasUncontended)       // CAS already known to fail
2488	>	wasUncontended = true;      // Continue after rehash
2489	>	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
2490	>	break;
2491	>	else if (counterCells != as || n >= NCPU)
2492	>	collide = false;            // At max size or stale
2493	>	else if (!collide)
2494	>	collide = true;
2495	>	else if (cellsBusy == 0 &&
2496	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
2497	>	try {
2498	>	if (counterCells == as) {// Expand table unless stale
2499	>	CounterCell[] rs = new CounterCell[n << 1];
2500	>	for (int i = 0; i < n; ++i)
2501	>	rs[i] = as[i];
2502	>	counterCells = rs;
2503	>	}
2504	>	} finally {
2505	>	cellsBusy = 0;
2506	>	}
2507	>	collide = false;
2508	>	continue;                   // Retry with expanded table
2509	>	}
2510	>	h = ThreadLocalRandom.advanceProbe(h);
2511	>	}
2512	>	else if (cellsBusy == 0 && counterCells == as &&
2513	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
2514	>	boolean init = false;
2515	>	try {                           // Initialize table
2516	>	if (counterCells == as) {
2517	>	CounterCell[] rs = new CounterCell[2];
2518	>	rs[h & 1] = new CounterCell(x);
2519	>	counterCells = rs;
2520	>	init = true;
2521	>	}
2522	>	} finally {
2523	>	cellsBusy = 0;
2524	>	}
2525	>	if (init)
2526	>	break;
2527	>	}
2528	>	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
2529	>	break;                          // Fall back on using base
2530	>	}
2531		}
2532
2533	+	/* ---------------- Conversion from/to TreeBins -------------- */
2534	+
2535		/**
2536	<	* Returns the hash code value for this {@link Map}, i.e.,
2537	<	* the sum of, for each key-value pair in the map,
2538	<	* {@code key.hashCode() ^ value.hashCode()}.
2539	<	*
2540	<	* @return the hash code value for this map
2536	>	* Replaces all linked nodes in bin at given index unless table is
2537	>	* too small, in which case resizes instead.
2538	>	*/
2539	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2540	>	Node<K,V> b; int n, sc;
2541	>	if (tab != null) {
2542	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY) {
2543	>	if (tab == table && (sc = sizeCtl) >= 0 &&
2544	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2545	>	transfer(tab, null);
2546	>	}
2547	>	else if ((b = tabAt(tab, index)) != null && b.hash >= 0) {
2548	>	synchronized (b) {
2549	>	if (tabAt(tab, index) == b) {
2550	>	TreeNode<K,V> hd = null, tl = null;
2551	>	for (Node<K,V> e = b; e != null; e = e.next) {
2552	>	TreeNode<K,V> p =
2553	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2554	>	null, null);
2555	>	if ((p.prev = tl) == null)
2556	>	hd = p;
2557	>	else
2558	>	tl.next = p;
2559	>	tl = p;
2560	>	}
2561	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2562	>	}
2563	>	}
2564	>	}
2565	>	}
2566	>	}
2567	>
2568	>	/**
2569	>	* Returns a list on non-TreeNodes replacing those in given list.
2570		*/
2571	<	public int hashCode() {
2572	<	int h = 0;
2573	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2574	<	Object v;
2575	<	while ((v = it.advance()) != null) {
2576	<	h += it.nextKey.hashCode() ^ v.hashCode();
2571	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2572	>	Node<K,V> hd = null, tl = null;
2573	>	for (Node<K,V> q = b; q != null; q = q.next) {
2574	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2575	>	if (tl == null)
2576	>	hd = p;
2577	>	else
2578	>	tl.next = p;
2579	>	tl = p;
2580		}
2581	<	return h;
2581	>	return hd;
2582		}
2583
2584	+	/* ---------------- TreeNodes -------------- */
2585	+
2586		/**
2587	<	* Returns a string representation of this map.  The string
3113	<	* representation consists of a list of key-value mappings (in no
3114	<	* particular order) enclosed in braces ("{@code {}}").  Adjacent
3115	<	* mappings are separated by the characters {@code ", "} (comma
3116	<	* and space).  Each key-value mapping is rendered as the key
3117	<	* followed by an equals sign ("{@code =}") followed by the
3118	<	* associated value.
3119	<	*
3120	<	* @return a string representation of this map
2587	>	* Nodes for use in TreeBins
2588		*/
2589	<	public String toString() {
2590	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2591	<	StringBuilder sb = new StringBuilder();
2592	<	sb.append('{');
2593	<	Object v;
2594	<	if ((v = it.advance()) != null) {
2595	<	for (;;) {
2596	<	Object k = it.nextKey;
2597	<	sb.append(k == this ? "(this Map)" : k);
2598	<	sb.append('=');
2599	<	sb.append(v == this ? "(this Map)" : v);
2600	<	if ((v = it.advance()) == null)
2589	>	static final class TreeNode<K,V> extends Node<K,V> {
2590	>	TreeNode<K,V> parent;  // red-black tree links
2591	>	TreeNode<K,V> left;
2592	>	TreeNode<K,V> right;
2593	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2594	>	boolean red;
2595	>
2596	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2597	>	TreeNode<K,V> parent) {
2598	>	super(hash, key, val, next);
2599	>	this.parent = parent;
2600	>	}
2601	>
2602	>	Node<K,V> find(int h, Object k) {
2603	>	return findTreeNode(h, k, null);
2604	>	}
2605	>
2606	>	/**
2607	>	* Returns the TreeNode (or null if not found) for the given key
2608	>	* starting at given root.
2609	>	*/
2610	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2611	>	if (k != null) {
2612	>	TreeNode<K,V> p = this;
2613	>	do  {
2614	>	int ph, dir; K pk; TreeNode<K,V> q;
2615	>	TreeNode<K,V> pl = p.left, pr = p.right;
2616	>	if ((ph = p.hash) > h)
2617	>	p = pl;
2618	>	else if (ph < h)
2619	>	p = pr;
2620	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2621	>	return p;
2622	>	else if (pl == null)
2623	>	p = pr;
2624	>	else if (pr == null)
2625	>	p = pl;
2626	>	else if ((kc != null ||
2627	>	(kc = comparableClassFor(k)) != null) &&
2628	>	(dir = compareComparables(kc, k, pk)) != 0)
2629	>	p = (dir < 0) ? pl : pr;
2630	>	else if ((q = pr.findTreeNode(h, k, kc)) != null)
2631	>	return q;
2632	>	else
2633	>	p = pl;
2634	>	} while (p != null);
2635	>	}
2636	>	return null;
2637	>	}
2638	>	}
2639	>
2640	>	/* ---------------- TreeBins -------------- */
2641	>
2642	>	/**
2643	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2644	>	* keys or values, but instead point to list of TreeNodes and
2645	>	* their root. They also maintain a parasitic read-write lock
2646	>	* forcing writers (who hold bin lock) to wait for readers (who do
2647	>	* not) to complete before tree restructuring operations.
2648	>	*/
2649	>	static final class TreeBin<K,V> extends Node<K,V> {
2650	>	TreeNode<K,V> root;
2651	>	volatile TreeNode<K,V> first;
2652	>	volatile Thread waiter;
2653	>	volatile int lockState;
2654	>	// values for lockState
2655	>	static final int WRITER = 1; // set while holding write lock
2656	>	static final int WAITER = 2; // set when waiting for write lock
2657	>	static final int READER = 4; // increment value for setting read lock
2658	>
2659	>	/**
2660	>	* Tie-breaking utility for ordering insertions when equal
2661	>	* hashCodes and non-comparable. We don't require a total
2662	>	* order, just a consistent insertion rule to maintain
2663	>	* equivalence across rebalancings. Tie-breaking further than
2664	>	* necessary simplifies testing a bit.
2665	>	*/
2666	>	static int tieBreakOrder(Object a, Object b) {
2667	>	int d;
2668	>	if (a == null || b == null ||
2669	>	(d = a.getClass().getName().
2670	>	compareTo(b.getClass().getName())) == 0)
2671	>	d = (System.identityHashCode(a) <= System.identityHashCode(b) ?
2672	>	-1 : 1);
2673	>	return d;
2674	>	}
2675	>
2676	>	/**
2677	>	* Creates bin with initial set of nodes headed by b.
2678	>	*/
2679	>	TreeBin(TreeNode<K,V> b) {
2680	>	super(TREEBIN, null, null, null);
2681	>	this.first = b;
2682	>	TreeNode<K,V> r = null;
2683	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2684	>	next = (TreeNode<K,V>)x.next;
2685	>	x.left = x.right = null;
2686	>	if (r == null) {
2687	>	x.parent = null;
2688	>	x.red = false;
2689	>	r = x;
2690	>	}
2691	>	else {
2692	>	K k = x.key;
2693	>	int h = x.hash;
2694	>	Class<?> kc = null;
2695	>	for (TreeNode<K,V> p = r;;) {
2696	>	int dir, ph;
2697	>	K pk = p.key;
2698	>	if ((ph = p.hash) > h)
2699	>	dir = -1;
2700	>	else if (ph < h)
2701	>	dir = 1;
2702	>	else if ((kc == null &&
2703	>	(kc = comparableClassFor(k)) == null) ||
2704	>	(dir = compareComparables(kc, k, pk)) == 0)
2705	>	dir = tieBreakOrder(k, pk);
2706	>	TreeNode<K,V> xp = p;
2707	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2708	>	x.parent = xp;
2709	>	if (dir <= 0)
2710	>	xp.left = x;
2711	>	else
2712	>	xp.right = x;
2713	>	r = balanceInsertion(r, x);
2714	>	break;
2715	>	}
2716	>	}
2717	>	}
2718	>	}
2719	>	this.root = r;
2720	>	assert checkInvariants(root);
2721	>	}
2722	>
2723	>	/**
2724	>	* Acquires write lock for tree restructuring.
2725	>	*/
2726	>	private final void lockRoot() {
2727	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2728	>	contendedLock(); // offload to separate method
2729	>	}
2730	>
2731	>	/**
2732	>	* Releases write lock for tree restructuring.
2733	>	*/
2734	>	private final void unlockRoot() {
2735	>	lockState = 0;
2736	>	}
2737	>
2738	>	/**
2739	>	* Possibly blocks awaiting root lock.
2740	>	*/
2741	>	private final void contendedLock() {
2742	>	boolean waiting = false;
2743	>	for (int s;;) {
2744	>	if (((s = lockState) & WRITER) == 0) {
2745	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2746	>	if (waiting)
2747	>	waiter = null;
2748	>	return;
2749	>	}
2750	>	}
2751	>	else if ((s & WAITER) == 0) {
2752	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2753	>	waiting = true;
2754	>	waiter = Thread.currentThread();
2755	>	}
2756	>	}
2757	>	else if (waiting)
2758	>	LockSupport.park(this);
2759	>	}
2760	>	}
2761	>
2762	>	/**
2763	>	* Returns matching node or null if none. Tries to search
2764	>	* using tree comparisons from root, but continues linear
2765	>	* search when lock not available.
2766	>	*/
2767	>	final Node<K,V> find(int h, Object k) {
2768	>	if (k != null) {
2769	>	for (Node<K,V> e = first; e != null; e = e.next) {
2770	>	int s; K ek;
2771	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2772	>	if (e.hash == h &&
2773	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2774	>	return e;
2775	>	}
2776	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2777	>	s + READER)) {
2778	>	TreeNode<K,V> r, p;
2779	>	try {
2780	>	p = ((r = root) == null ? null :
2781	>	r.findTreeNode(h, k, null));
2782	>	} finally {
2783	>	Thread w;
2784	>	if (U.getAndAddInt(this, LOCKSTATE, -READER) ==
2785	>	(READER|WAITER) && (w = waiter) != null)
2786	>	LockSupport.unpark(w);
2787	>	}
2788	>	return p;
2789	>	}
2790	>	}
2791	>	}
2792	>	return null;
2793	>	}
2794	>
2795	>	/**
2796	>	* Finds or adds a node.
2797	>	* @return null if added
2798	>	*/
2799	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2800	>	Class<?> kc = null;
2801	>	boolean searched = false;
2802	>	for (TreeNode<K,V> p = root;;) {
2803	>	int dir, ph; K pk;
2804	>	if (p == null) {
2805	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2806		break;
2807	<	sb.append(',').append(' ');
2807	>	}
2808	>	else if ((ph = p.hash) > h)
2809	>	dir = -1;
2810	>	else if (ph < h)
2811	>	dir = 1;
2812	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2813	>	return p;
2814	>	else if ((kc == null &&
2815	>	(kc = comparableClassFor(k)) == null) ||
2816	>	(dir = compareComparables(kc, k, pk)) == 0) {
2817	>	if (!searched) {
2818	>	TreeNode<K,V> q, ch;
2819	>	searched = true;
2820	>	if (((ch = p.left) != null &&
2821	>	(q = ch.findTreeNode(h, k, kc)) != null) ||
2822	>	((ch = p.right) != null &&
2823	>	(q = ch.findTreeNode(h, k, kc)) != null))
2824	>	return q;
2825	>	}
2826	>	dir = tieBreakOrder(k, pk);
2827	>	}
2828	>
2829	>	TreeNode<K,V> xp = p;
2830	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2831	>	TreeNode<K,V> x, f = first;
2832	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2833	>	if (f != null)
2834	>	f.prev = x;
2835	>	if (dir <= 0)
2836	>	xp.left = x;
2837	>	else
2838	>	xp.right = x;
2839	>	if (!xp.red)
2840	>	x.red = true;
2841	>	else {
2842	>	lockRoot();
2843	>	try {
2844	>	root = balanceInsertion(root, x);
2845	>	} finally {
2846	>	unlockRoot();
2847	>	}
2848	>	}
2849	>	break;
2850	>	}
2851	>	}
2852	>	assert checkInvariants(root);
2853	>	return null;
2854	>	}
2855	>
2856	>	/**
2857	>	* Removes the given node, that must be present before this
2858	>	* call.  This is messier than typical red-black deletion code
2859	>	* because we cannot swap the contents of an interior node
2860	>	* with a leaf successor that is pinned by "next" pointers
2861	>	* that are accessible independently of lock. So instead we
2862	>	* swap the tree linkages.
2863	>	*
2864	>	* @return true if now too small, so should be untreeified
2865	>	*/
2866	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2867	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2868	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2869	>	TreeNode<K,V> r, rl;
2870	>	if (pred == null)
2871	>	first = next;
2872	>	else
2873	>	pred.next = next;
2874	>	if (next != null)
2875	>	next.prev = pred;
2876	>	if (first == null) {
2877	>	root = null;
2878	>	return true;
2879	>	}
2880	>	if ((r = root) == null || r.right == null || // too small
2881	>	(rl = r.left) == null || rl.left == null)
2882	>	return true;
2883	>	lockRoot();
2884	>	try {
2885	>	TreeNode<K,V> replacement;
2886	>	TreeNode<K,V> pl = p.left;
2887	>	TreeNode<K,V> pr = p.right;
2888	>	if (pl != null && pr != null) {
2889	>	TreeNode<K,V> s = pr, sl;
2890	>	while ((sl = s.left) != null) // find successor
2891	>	s = sl;
2892	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2893	>	TreeNode<K,V> sr = s.right;
2894	>	TreeNode<K,V> pp = p.parent;
2895	>	if (s == pr) { // p was s's direct parent
2896	>	p.parent = s;
2897	>	s.right = p;
2898	>	}
2899	>	else {
2900	>	TreeNode<K,V> sp = s.parent;
2901	>	if ((p.parent = sp) != null) {
2902	>	if (s == sp.left)
2903	>	sp.left = p;
2904	>	else
2905	>	sp.right = p;
2906	>	}
2907	>	if ((s.right = pr) != null)
2908	>	pr.parent = s;
2909	>	}
2910	>	p.left = null;
2911	>	if ((p.right = sr) != null)
2912	>	sr.parent = p;
2913	>	if ((s.left = pl) != null)
2914	>	pl.parent = s;
2915	>	if ((s.parent = pp) == null)
2916	>	r = s;
2917	>	else if (p == pp.left)
2918	>	pp.left = s;
2919	>	else
2920	>	pp.right = s;
2921	>	if (sr != null)
2922	>	replacement = sr;
2923	>	else
2924	>	replacement = p;
2925	>	}
2926	>	else if (pl != null)
2927	>	replacement = pl;
2928	>	else if (pr != null)
2929	>	replacement = pr;
2930	>	else
2931	>	replacement = p;
2932	>	if (replacement != p) {
2933	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2934	>	if (pp == null)
2935	>	r = replacement;
2936	>	else if (p == pp.left)
2937	>	pp.left = replacement;
2938	>	else
2939	>	pp.right = replacement;
2940	>	p.left = p.right = p.parent = null;
2941	>	}
2942	>
2943	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2944	>
2945	>	if (p == replacement) {  // detach pointers
2946	>	TreeNode<K,V> pp;
2947	>	if ((pp = p.parent) != null) {
2948	>	if (p == pp.left)
2949	>	pp.left = null;
2950	>	else if (p == pp.right)
2951	>	pp.right = null;
2952	>	p.parent = null;
2953	>	}
2954	>	}
2955	>	} finally {
2956	>	unlockRoot();
2957	>	}
2958	>	assert checkInvariants(root);
2959	>	return false;
2960	>	}
2961	>
2962	>	/* ------------------------------------------------------------ */
2963	>	// Red-black tree methods, all adapted from CLR
2964	>
2965	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2966	>	TreeNode<K,V> p) {
2967	>	TreeNode<K,V> r, pp, rl;
2968	>	if (p != null && (r = p.right) != null) {
2969	>	if ((rl = p.right = r.left) != null)
2970	>	rl.parent = p;
2971	>	if ((pp = r.parent = p.parent) == null)
2972	>	(root = r).red = false;
2973	>	else if (pp.left == p)
2974	>	pp.left = r;
2975	>	else
2976	>	pp.right = r;
2977	>	r.left = p;
2978	>	p.parent = r;
2979	>	}
2980	>	return root;
2981	>	}
2982	>
2983	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2984	>	TreeNode<K,V> p) {
2985	>	TreeNode<K,V> l, pp, lr;
2986	>	if (p != null && (l = p.left) != null) {
2987	>	if ((lr = p.left = l.right) != null)
2988	>	lr.parent = p;
2989	>	if ((pp = l.parent = p.parent) == null)
2990	>	(root = l).red = false;
2991	>	else if (pp.right == p)
2992	>	pp.right = l;
2993	>	else
2994	>	pp.left = l;
2995	>	l.right = p;
2996	>	p.parent = l;
2997	>	}
2998	>	return root;
2999	>	}
3000	>
3001	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
3002	>	TreeNode<K,V> x) {
3003	>	x.red = true;
3004	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
3005	>	if ((xp = x.parent) == null) {
3006	>	x.red = false;
3007	>	return x;
3008	>	}
3009	>	else if (!xp.red || (xpp = xp.parent) == null)
3010	>	return root;
3011	>	if (xp == (xppl = xpp.left)) {
3012	>	if ((xppr = xpp.right) != null && xppr.red) {
3013	>	xppr.red = false;
3014	>	xp.red = false;
3015	>	xpp.red = true;
3016	>	x = xpp;
3017	>	}
3018	>	else {
3019	>	if (x == xp.right) {
3020	>	root = rotateLeft(root, x = xp);
3021	>	xpp = (xp = x.parent) == null ? null : xp.parent;
3022	>	}
3023	>	if (xp != null) {
3024	>	xp.red = false;
3025	>	if (xpp != null) {
3026	>	xpp.red = true;
3027	>	root = rotateRight(root, xpp);
3028	>	}
3029	>	}
3030	>	}
3031	>	}
3032	>	else {
3033	>	if (xppl != null && xppl.red) {
3034	>	xppl.red = false;
3035	>	xp.red = false;
3036	>	xpp.red = true;
3037	>	x = xpp;
3038	>	}
3039	>	else {
3040	>	if (x == xp.left) {
3041	>	root = rotateRight(root, x = xp);
3042	>	xpp = (xp = x.parent) == null ? null : xp.parent;
3043	>	}
3044	>	if (xp != null) {
3045	>	xp.red = false;
3046	>	if (xpp != null) {
3047	>	xpp.red = true;
3048	>	root = rotateLeft(root, xpp);
3049	>	}
3050	>	}
3051	>	}
3052	>	}
3053	>	}
3054	>	}
3055	>
3056	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
3057	>	TreeNode<K,V> x) {
3058	>	for (TreeNode<K,V> xp, xpl, xpr;;)  {
3059	>	if (x == null || x == root)
3060	>	return root;
3061	>	else if ((xp = x.parent) == null) {
3062	>	x.red = false;
3063	>	return x;
3064	>	}
3065	>	else if (x.red) {
3066	>	x.red = false;
3067	>	return root;
3068	>	}
3069	>	else if ((xpl = xp.left) == x) {
3070	>	if ((xpr = xp.right) != null && xpr.red) {
3071	>	xpr.red = false;
3072	>	xp.red = true;
3073	>	root = rotateLeft(root, xp);
3074	>	xpr = (xp = x.parent) == null ? null : xp.right;
3075	>	}
3076	>	if (xpr == null)
3077	>	x = xp;
3078	>	else {
3079	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
3080	>	if ((sr == null || !sr.red) &&
3081	>	(sl == null || !sl.red)) {
3082	>	xpr.red = true;
3083	>	x = xp;
3084	>	}
3085	>	else {
3086	>	if (sr == null || !sr.red) {
3087	>	if (sl != null)
3088	>	sl.red = false;
3089	>	xpr.red = true;
3090	>	root = rotateRight(root, xpr);
3091	>	xpr = (xp = x.parent) == null ?
3092	>	null : xp.right;
3093	>	}
3094	>	if (xpr != null) {
3095	>	xpr.red = (xp == null) ? false : xp.red;
3096	>	if ((sr = xpr.right) != null)
3097	>	sr.red = false;
3098	>	}
3099	>	if (xp != null) {
3100	>	xp.red = false;
3101	>	root = rotateLeft(root, xp);
3102	>	}
3103	>	x = root;
3104	>	}
3105	>	}
3106	>	}
3107	>	else { // symmetric
3108	>	if (xpl != null && xpl.red) {
3109	>	xpl.red = false;
3110	>	xp.red = true;
3111	>	root = rotateRight(root, xp);
3112	>	xpl = (xp = x.parent) == null ? null : xp.left;
3113	>	}
3114	>	if (xpl == null)
3115	>	x = xp;
3116	>	else {
3117	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3118	>	if ((sl == null || !sl.red) &&
3119	>	(sr == null || !sr.red)) {
3120	>	xpl.red = true;
3121	>	x = xp;
3122	>	}
3123	>	else {
3124	>	if (sl == null || !sl.red) {
3125	>	if (sr != null)
3126	>	sr.red = false;
3127	>	xpl.red = true;
3128	>	root = rotateLeft(root, xpl);
3129	>	xpl = (xp = x.parent) == null ?
3130	>	null : xp.left;
3131	>	}
3132	>	if (xpl != null) {
3133	>	xpl.red = (xp == null) ? false : xp.red;
3134	>	if ((sl = xpl.left) != null)
3135	>	sl.red = false;
3136	>	}
3137	>	if (xp != null) {
3138	>	xp.red = false;
3139	>	root = rotateRight(root, xp);
3140	>	}
3141	>	x = root;
3142	>	}
3143	>	}
3144	>	}
3145	>	}
3146	>	}
3147	>
3148	>	/**
3149	>	* Recursive invariant check
3150	>	*/
3151	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3152	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3153	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3154	>	if (tb != null && tb.next != t)
3155	>	return false;
3156	>	if (tn != null && tn.prev != t)
3157	>	return false;
3158	>	if (tp != null && t != tp.left && t != tp.right)
3159	>	return false;
3160	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3161	>	return false;
3162	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3163	>	return false;
3164	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3165	>	return false;
3166	>	if (tl != null && !checkInvariants(tl))
3167	>	return false;
3168	>	if (tr != null && !checkInvariants(tr))
3169	>	return false;
3170	>	return true;
3171	>	}
3172	>
3173	>	private static final sun.misc.Unsafe U;
3174	>	private static final long LOCKSTATE;
3175	>	static {
3176	>	try {
3177	>	U = sun.misc.Unsafe.getUnsafe();
3178	>	Class<?> k = TreeBin.class;
3179	>	LOCKSTATE = U.objectFieldOffset
3180	>	(k.getDeclaredField("lockState"));
3181	>	} catch (Exception e) {
3182	>	throw new Error(e);
3183		}
3184		}
3138	–	return sb.append('}').toString();
3185		}
3186
3187	+	/* ----------------Table Traversal -------------- */
3188	+
3189		/**
3190	<	* Compares the specified object with this map for equality.
3191	<	* Returns {@code true} if the given object is a map with the same
3192	<	* mappings as this map.  This operation may return misleading
3193	<	* results if either map is concurrently modified during execution
3194	<	* of this method.
3190	>	* Records the table, its length, and current traversal index for a
3191	>	* traverser that must process a region of a forwarded table before
3192	>	* proceeding with current table.
3193	>	*/
3194	>	static final class TableStack<K,V> {
3195	>	int length;
3196	>	int index;
3197	>	Node<K,V>[] tab;
3198	>	TableStack<K,V> next;
3199	>	}
3200	>
3201	>	/**
3202	>	* Encapsulates traversal for methods such as containsValue; also
3203	>	* serves as a base class for other iterators and spliterators.
3204		*
3205	<	* @param o object to be compared for equality with this map
3206	<	* @return {@code true} if the specified object is equal to this map
3205	>	* Method advance visits once each still-valid node that was
3206	>	* reachable upon iterator construction. It might miss some that
3207	>	* were added to a bin after the bin was visited, which is OK wrt
3208	>	* consistency guarantees. Maintaining this property in the face
3209	>	* of possible ongoing resizes requires a fair amount of
3210	>	* bookkeeping state that is difficult to optimize away amidst
3211	>	* volatile accesses.  Even so, traversal maintains reasonable
3212	>	* throughput.
3213	>	*
3214	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3215	>	* However, if the table has been resized, then all future steps
3216	>	* must traverse both the bin at the current index as well as at
3217	>	* (index + baseSize); and so on for further resizings. To
3218	>	* paranoically cope with potential sharing by users of iterators
3219	>	* across threads, iteration terminates if a bounds checks fails
3220	>	* for a table read.
3221		*/
3222	<	public boolean equals(Object o) {
3223	<	if (o != this) {
3224	<	if (!(o instanceof Map))
3225	<	return false;
3226	<	Map<?,?> m = (Map<?,?>) o;
3227	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3228	<	Object val;
3229	<	while ((val = it.advance()) != null) {
3230	<	Object v = m.get(it.nextKey);
3231	<	if (v == null || (v != val && !v.equals(val)))
3232	<	return false;
3222	>	static class Traverser<K,V> {
3223	>	Node<K,V>[] tab;        // current table; updated if resized
3224	>	Node<K,V> next;         // the next entry to use
3225	>	TableStack<K,V> stack, spare; // to save/restore on ForwardingNodes
3226	>	int index;              // index of bin to use next
3227	>	int baseIndex;          // current index of initial table
3228	>	int baseLimit;          // index bound for initial table
3229	>	final int baseSize;     // initial table size
3230	>
3231	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3232	>	this.tab = tab;
3233	>	this.baseSize = size;
3234	>	this.baseIndex = this.index = index;
3235	>	this.baseLimit = limit;
3236	>	this.next = null;
3237	>	}
3238	>
3239	>	/**
3240	>	* Advances if possible, returning next valid node, or null if none.
3241	>	*/
3242	>	final Node<K,V> advance() {
3243	>	Node<K,V> e;
3244	>	if ((e = next) != null)
3245	>	e = e.next;
3246	>	for (;;) {
3247	>	Node<K,V>[] t; int i, n;  // must use locals in checks
3248	>	if (e != null)
3249	>	return next = e;
3250	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3251	>	(n = t.length) <= (i = index) || i < 0)
3252	>	return next = null;
3253	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
3254	>	if (e instanceof ForwardingNode) {
3255	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3256	>	e = null;
3257	>	pushState(t, i, n);
3258	>	continue;
3259	>	}
3260	>	else if (e instanceof TreeBin)
3261	>	e = ((TreeBin<K,V>)e).first;
3262	>	else
3263	>	e = null;
3264	>	}
3265	>	if (stack != null)
3266	>	recoverState(n);
3267	>	else if ((index = i + baseSize) >= n)
3268	>	index = ++baseIndex; // visit upper slots if present
3269		}
3270	<	for (Map.Entry<?,?> e : m.entrySet()) {
3271	<	Object mk, mv, v;
3272	<	if ((mk = e.getKey()) == null ||
3273	<	(mv = e.getValue()) == null ||
3274	<	(v = internalGet(mk)) == null ||
3275	<	(mv != v && !mv.equals(v)))
3276	<	return false;
3270	>	}
3271	>
3272	>	/**
3273	>	* Saves traversal state upon encountering a forwarding node.
3274	>	*/
3275	>	private void pushState(Node<K,V>[] t, int i, int n) {
3276	>	TableStack<K,V> s = spare;  // reuse if possible
3277	>	if (s != null)
3278	>	spare = s.next;
3279	>	else
3280	>	s = new TableStack<K,V>();
3281	>	s.tab = t;
3282	>	s.length = n;
3283	>	s.index = i;
3284	>	s.next = stack;
3285	>	stack = s;
3286	>	}
3287	>
3288	>	/**
3289	>	* Possibly pops traversal state.
3290	>	*
3291	>	* @param n length of current table
3292	>	*/
3293	>	private void recoverState(int n) {
3294	>	TableStack<K,V> s; int len;
3295	>	while ((s = stack) != null && (index += (len = s.length)) >= n) {
3296	>	n = len;
3297	>	index = s.index;
3298	>	tab = s.tab;
3299	>	s.tab = null;
3300	>	TableStack<K,V> next = s.next;
3301	>	s.next = spare; // save for reuse
3302	>	stack = next;
3303	>	spare = s;
3304		}
3305	+	if (s == null && (index += baseSize) >= n)
3306	+	index = ++baseIndex;
3307		}
3172	–	return true;
3308		}
3309
3310	<	/* ----------------Iterators -------------- */
3311	<
3312	<	@SuppressWarnings("serial") static final class KeyIterator<K,V> extends Traverser<K,V,Object>
3313	<	implements Spliterator<K>, Enumeration<K> {
3314	<	KeyIterator(ConcurrentHashMap<K, V> map) { super(map); }
3315	<	KeyIterator(Traverser<K,V,Object> it) {
3316	<	super(it);
3310	>	/**
3311	>	* Base of key, value, and entry Iterators. Adds fields to
3312	>	* Traverser to support iterator.remove.
3313	>	*/
3314	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3315	>	final ConcurrentHashMap<K,V> map;
3316	>	Node<K,V> lastReturned;
3317	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3318	>	ConcurrentHashMap<K,V> map) {
3319	>	super(tab, size, index, limit);
3320	>	this.map = map;
3321	>	advance();
3322		}
3323	<	public KeyIterator<K,V> split() {
3324	<	if (nextKey != null)
3323	>
3324	>	public final boolean hasNext() { return next != null; }
3325	>	public final boolean hasMoreElements() { return next != null; }
3326	>
3327	>	public final void remove() {
3328	>	Node<K,V> p;
3329	>	if ((p = lastReturned) == null)
3330		throw new IllegalStateException();
3331	<	return new KeyIterator<K,V>(this);
3331	>	lastReturned = null;
3332	>	map.replaceNode(p.key, null, null);
3333	>	}
3334	>	}
3335	>
3336	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3337	>	implements Iterator<K>, Enumeration<K> {
3338	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3339	>	ConcurrentHashMap<K,V> map) {
3340	>	super(tab, index, size, limit, map);
3341		}
3342	<	@SuppressWarnings("unchecked") public final K next() {
3343	<	if (nextVal == null && advance() == null)
3342	>
3343	>	public final K next() {
3344	>	Node<K,V> p;
3345	>	if ((p = next) == null)
3346		throw new NoSuchElementException();
3347	<	Object k = nextKey;
3348	<	nextVal = null;
3349	<	return (K) k;
3347	>	K k = p.key;
3348	>	lastReturned = p;
3349	>	advance();
3350	>	return k;
3351		}
3352
3353		public final K nextElement() { return next(); }
3354		}
3355
3356	<	@SuppressWarnings("serial") static final class ValueIterator<K,V> extends Traverser<K,V,Object>
3357	<	implements Spliterator<V>, Enumeration<V> {
3358	<	ValueIterator(ConcurrentHashMap<K, V> map) { super(map); }
3359	<	ValueIterator(Traverser<K,V,Object> it) {
3360	<	super(it);
3204	<	}
3205	<	public ValueIterator<K,V> split() {
3206	<	if (nextKey != null)
3207	<	throw new IllegalStateException();
3208	<	return new ValueIterator<K,V>(this);
3356	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3357	>	implements Iterator<V>, Enumeration<V> {
3358	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3359	>	ConcurrentHashMap<K,V> map) {
3360	>	super(tab, index, size, limit, map);
3361		}
3362
3363	<	@SuppressWarnings("unchecked") public final V next() {
3364	<	Object v;
3365	<	if ((v = nextVal) == null && (v = advance()) == null)
3363	>	public final V next() {
3364	>	Node<K,V> p;
3365	>	if ((p = next) == null)
3366		throw new NoSuchElementException();
3367	<	nextVal = null;
3368	<	return (V) v;
3367	>	V v = p.val;
3368	>	lastReturned = p;
3369	>	advance();
3370	>	return v;
3371		}
3372
3373		public final V nextElement() { return next(); }
3374		}
3375
3376	<	@SuppressWarnings("serial") static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3377	<	implements Spliterator<Map.Entry<K,V>> {
3378	<	EntryIterator(ConcurrentHashMap<K, V> map) { super(map); }
3379	<	EntryIterator(Traverser<K,V,Object> it) {
3380	<	super(it);
3227	<	}
3228	<	public EntryIterator<K,V> split() {
3229	<	if (nextKey != null)
3230	<	throw new IllegalStateException();
3231	<	return new EntryIterator<K,V>(this);
3376	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3377	>	implements Iterator<Map.Entry<K,V>> {
3378	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3379	>	ConcurrentHashMap<K,V> map) {
3380	>	super(tab, index, size, limit, map);
3381		}
3382
3383	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3384	<	Object v;
3385	<	if ((v = nextVal) == null && (v = advance()) == null)
3383	>	public final Map.Entry<K,V> next() {
3384	>	Node<K,V> p;
3385	>	if ((p = next) == null)
3386		throw new NoSuchElementException();
3387	<	Object k = nextKey;
3388	<	nextVal = null;
3389	<	return new MapEntry<K,V>((K)k, (V)v, map);
3387	>	K k = p.key;
3388	>	V v = p.val;
3389	>	lastReturned = p;
3390	>	advance();
3391	>	return new MapEntry<K,V>(k, v, map);
3392		}
3393		}
3394
3395		/**
3396	<	* Exported Entry for iterators
3396	>	* Exported Entry for EntryIterator
3397		*/
3398	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3398	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3399		final K key; // non-null
3400		V val;       // non-null
3401	<	final ConcurrentHashMap<K, V> map;
3402	<	MapEntry(K key, V val, ConcurrentHashMap<K, V> map) {
3401	>	final ConcurrentHashMap<K,V> map;
3402	>	MapEntry(K key, V val, ConcurrentHashMap<K,V> map) {
3403		this.key = key;
3404		this.val = val;
3405		this.map = map;
3406		}
3407	<	public final K getKey()       { return key; }
3408	<	public final V getValue()     { return val; }
3409	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3410	<	public final String toString(){ return key + "=" + val; }
3407	>	public K getKey()        { return key; }
3408	>	public V getValue()      { return val; }
3409	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3410	>	public String toString() { return key + "=" + val; }
3411
3412	<	public final boolean equals(Object o) {
3412	>	public boolean equals(Object o) {
3413		Object k, v; Map.Entry<?,?> e;
3414		return ((o instanceof Map.Entry) &&
3415		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3272 | Line 3423 | public class ConcurrentHashMap<K, V>
3423		* value to return is somewhat arbitrary here. Since we do not
3424		* necessarily track asynchronous changes, the most recent
3425		* "previous" value could be different from what we return (or
3426	<	* could even have been removed in which case the put will
3426	>	* could even have been removed, in which case the put will
3427		* re-establish). We do not and cannot guarantee more.
3428		*/
3429	<	public final V setValue(V value) {
3429	>	public V setValue(V value) {
3430		if (value == null) throw new NullPointerException();
3431		V v = val;
3432		val = value;
#	Line 3284 | Line 3435 | public class ConcurrentHashMap<K, V>
3435		}
3436		}
3437
3438	<	/* ---------------- Serialization Support -------------- */
3438	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3439	>	implements Spliterator<K> {
3440	>	long est;               // size estimate
3441	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3442	>	long est) {
3443	>	super(tab, size, index, limit);
3444	>	this.est = est;
3445	>	}
3446	>
3447	>	public Spliterator<K> trySplit() {
3448	>	int i, f, h;
3449	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3450	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3451	>	f, est >>>= 1);
3452	>	}
3453
3454	<	/**
3455	<	* Stripped-down version of helper class used in previous version,
3456	<	* declared for the sake of serialization compatibility
3457	<	*/
3458	<	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	<	}
3454	>	public void forEachRemaining(Consumer<? super K> action) {
3455	>	if (action == null) throw new NullPointerException();
3456	>	for (Node<K,V> p; (p = advance()) != null;)
3457	>	action.accept(p.key);
3458	>	}
3459
3460	<	/**
3461	<	* Saves the state of the {@code ConcurrentHashMap} instance to a
3462	<	* stream (i.e., serializes it).
3463	<	* @param s the stream
3464	<	* @serialData
3465	<	* the key (Object) and value (Object)
3466	<	* for each key-value mapping, followed by a null pair.
3467	<	* The key-value mappings are emitted in no particular order.
3468	<	*/
3469	<	@SuppressWarnings("unchecked") private void writeObject(java.io.ObjectOutputStream s)
3470	<	throws java.io.IOException {
3471	<	if (segments == null) { // for serialization compatibility
3472	<	segments = (Segment<K,V>[])
3473	<	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);
3460	>	public boolean tryAdvance(Consumer<? super K> action) {
3461	>	if (action == null) throw new NullPointerException();
3462	>	Node<K,V> p;
3463	>	if ((p = advance()) == null)
3464	>	return false;
3465	>	action.accept(p.key);
3466	>	return true;
3467	>	}
3468	>
3469	>	public long estimateSize() { return est; }
3470	>
3471	>	public int characteristics() {
3472	>	return Spliterator.DISTINCT | Spliterator.CONCURRENT |
3473	>	Spliterator.NONNULL;
3474		}
3323	–	s.writeObject(null);
3324	–	s.writeObject(null);
3325	–	segments = null; // throw away
3475		}
3476
3477	<	/**
3478	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3479	<	* @param s the stream
3480	<	*/
3481	<	@SuppressWarnings("unchecked") private void readObject(java.io.ObjectInputStream s)
3482	<	throws java.io.IOException, ClassNotFoundException {
3483	<	s.defaultReadObject();
3484	<	this.segments = null; // unneeded
3336	<	// initialize transient final field
3337	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
3477	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3478	>	implements Spliterator<V> {
3479	>	long est;               // size estimate
3480	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3481	>	long est) {
3482	>	super(tab, size, index, limit);
3483	>	this.est = est;
3484	>	}
3485
3486	<	// Create all nodes, then place in table once size is known
3487	<	long size = 0L;
3488	<	Node p = null;
3489	<	for (;;) {
3490	<	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;
3486	>	public Spliterator<V> trySplit() {
3487	>	int i, f, h;
3488	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3489	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3490	>	f, est >>>= 1);
3491		}
3492	<	if (p != null) {
3493	<	boolean init = false;
3494	<	int n;
3495	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3496	<	n = MAXIMUM_CAPACITY;
3497	<	else {
3498	<	int sz = (int)size;
3499	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
3500	<	}
3501	<	int sc = sizeCtl;
3502	<	boolean collide = false;
3503	<	if (n > sc &&
3504	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
3505	<	try {
3506	<	if (table == null) {
3507	<	init = true;
3508	<	Node[] tab = new Node[n];
3509	<	int mask = n - 1;
3510	<	while (p != null) {
3511	<	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	<	}
3492	>
3493	>	public void forEachRemaining(Consumer<? super V> action) {
3494	>	if (action == null) throw new NullPointerException();
3495	>	for (Node<K,V> p; (p = advance()) != null;)
3496	>	action.accept(p.val);
3497	>	}
3498	>
3499	>	public boolean tryAdvance(Consumer<? super V> action) {
3500	>	if (action == null) throw new NullPointerException();
3501	>	Node<K,V> p;
3502	>	if ((p = advance()) == null)
3503	>	return false;
3504	>	action.accept(p.val);
3505	>	return true;
3506	>	}
3507	>
3508	>	public long estimateSize() { return est; }
3509	>
3510	>	public int characteristics() {
3511	>	return Spliterator.CONCURRENT | Spliterator.NONNULL;
3512		}
3513		}
3514
3515	+	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3516	+	implements Spliterator<Map.Entry<K,V>> {
3517	+	final ConcurrentHashMap<K,V> map; // To export MapEntry
3518	+	long est;               // size estimate
3519	+	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3520	+	long est, ConcurrentHashMap<K,V> map) {
3521	+	super(tab, size, index, limit);
3522	+	this.map = map;
3523	+	this.est = est;
3524	+	}
3525
3526	<	// -------------------------------------------------------
3526	>	public Spliterator<Map.Entry<K,V>> trySplit() {
3527	>	int i, f, h;
3528	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3529	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3530	>	f, est >>>= 1, map);
3531	>	}
3532
3533	<	// Sams
3534	<	/** Interface describing a void action of one argument */
3535	<	public interface Action<A> { void apply(A a); }
3536	<	/** Interface describing a void action of two arguments */
3537	<	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); }
3533	>	public void forEachRemaining(Consumer<? super Map.Entry<K,V>> action) {
3534	>	if (action == null) throw new NullPointerException();
3535	>	for (Node<K,V> p; (p = advance()) != null; )
3536	>	action.accept(new MapEntry<K,V>(p.key, p.val, map));
3537	>	}
3538
3539	+	public boolean tryAdvance(Consumer<? super Map.Entry<K,V>> action) {
3540	+	if (action == null) throw new NullPointerException();
3541	+	Node<K,V> p;
3542	+	if ((p = advance()) == null)
3543	+	return false;
3544	+	action.accept(new MapEntry<K,V>(p.key, p.val, map));
3545	+	return true;
3546	+	}
3547
3548	<	// -------------------------------------------------------
3548	>	public long estimateSize() { return est; }
3549	>
3550	>	public int characteristics() {
3551	>	return Spliterator.DISTINCT | Spliterator.CONCURRENT |
3552	>	Spliterator.NONNULL;
3553	>	}
3554	>	}
3555	>
3556	>	// Parallel bulk operations
3557	>
3558	>	/**
3559	>	* Computes initial batch value for bulk tasks. The returned value
3560	>	* is approximately exp2 of the number of times (minus one) to
3561	>	* split task by two before executing leaf action. This value is
3562	>	* faster to compute and more convenient to use as a guide to
3563	>	* splitting than is the depth, since it is used while dividing by
3564	>	* two anyway.
3565	>	*/
3566	>	final int batchFor(long b) {
3567	>	long n;
3568	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3569	>	return 0;
3570	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3571	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3572	>	}
3573
3574		/**
3575		* Performs the given action for each (key, value).
3576		*
3577	+	* @param parallelismThreshold the (estimated) number of elements
3578	+	* needed for this operation to be executed in parallel
3579		* @param action the action
3580	+	* @since 1.8
3581		*/
3582	<	public void forEach(BiAction<K,V> action) {
3583	<	ForkJoinTasks.forEach
3584	<	(this, action).invoke();
3582	>	public void forEach(long parallelismThreshold,
3583	>	BiConsumer<? super K,? super V> action) {
3584	>	if (action == null) throw new NullPointerException();
3585	>	new ForEachMappingTask<K,V>
3586	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3587	>	action).invoke();
3588		}
3589
3590		/**
3591		* Performs the given action for each non-null transformation
3592		* of each (key, value).
3593		*
3594	+	* @param parallelismThreshold the (estimated) number of elements
3595	+	* needed for this operation to be executed in parallel
3596		* @param transformer a function returning the transformation
3597	<	* for an element, or null of there is no transformation (in
3598	<	* which case the action is not applied).
3597	>	* for an element, or null if there is no transformation (in
3598	>	* which case the action is not applied)
3599		* @param action the action
3600	+	* @param <U> the return type of the transformer
3601	+	* @since 1.8
3602		*/
3603	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3604	<	Action<U> action) {
3605	<	ForkJoinTasks.forEach
3606	<	(this, transformer, action).invoke();
3603	>	public <U> void forEach(long parallelismThreshold,
3604	>	BiFunction<? super K, ? super V, ? extends U> transformer,
3605	>	Consumer<? super U> action) {
3606	>	if (transformer == null || action == null)
3607	>	throw new NullPointerException();
3608	>	new ForEachTransformedMappingTask<K,V,U>
3609	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3610	>	transformer, action).invoke();
3611		}
3612
3613		/**
#	Line 3481 | Line 3617 | public class ConcurrentHashMap<K, V>
3617		* results of any other parallel invocations of the search
3618		* function are ignored.
3619		*
3620	+	* @param parallelismThreshold the (estimated) number of elements
3621	+	* needed for this operation to be executed in parallel
3622		* @param searchFunction a function returning a non-null
3623		* result on success, else null
3624	+	* @param <U> the return type of the search function
3625		* @return a non-null result from applying the given search
3626		* function on each (key, value), or null if none
3627	+	* @since 1.8
3628		*/
3629	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3630	<	return ForkJoinTasks.search
3631	<	(this, searchFunction).invoke();
3629	>	public <U> U search(long parallelismThreshold,
3630	>	BiFunction<? super K, ? super V, ? extends U> searchFunction) {
3631	>	if (searchFunction == null) throw new NullPointerException();
3632	>	return new SearchMappingsTask<K,V,U>
3633	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3634	>	searchFunction, new AtomicReference<U>()).invoke();
3635		}
3636
3637		/**
#	Line 3496 | Line 3639 | public class ConcurrentHashMap<K, V>
3639		* of all (key, value) pairs using the given reducer to
3640		* combine values, or null if none.
3641		*
3642	+	* @param parallelismThreshold the (estimated) number of elements
3643	+	* needed for this operation to be executed in parallel
3644		* @param transformer a function returning the transformation
3645	<	* for an element, or null of there is no transformation (in
3646	<	* which case it is not combined).
3645	>	* for an element, or null if there is no transformation (in
3646	>	* which case it is not combined)
3647		* @param reducer a commutative associative combining function
3648	+	* @param <U> the return type of the transformer
3649		* @return the result of accumulating the given transformation
3650		* of all (key, value) pairs
3651	+	* @since 1.8
3652		*/
3653	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3654	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3655	<	return ForkJoinTasks.reduce
3656	<	(this, transformer, reducer).invoke();
3653	>	public <U> U reduce(long parallelismThreshold,
3654	>	BiFunction<? super K, ? super V, ? extends U> transformer,
3655	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
3656	>	if (transformer == null || reducer == null)
3657	>	throw new NullPointerException();
3658	>	return new MapReduceMappingsTask<K,V,U>
3659	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3660	>	null, transformer, reducer).invoke();
3661		}
3662
3663		/**
#	Line 3514 | Line 3665 | public class ConcurrentHashMap<K, V>
3665		* of all (key, value) pairs using the given reducer to
3666		* combine values, and the given basis as an identity value.
3667		*
3668	+	* @param parallelismThreshold the (estimated) number of elements
3669	+	* needed for this operation to be executed in parallel
3670		* @param transformer a function returning the transformation
3671		* for an element
3672		* @param basis the identity (initial default value) for the reduction
3673		* @param reducer a commutative associative combining function
3674		* @return the result of accumulating the given transformation
3675		* of all (key, value) pairs
3676	+	* @since 1.8
3677		*/
3678	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3678	>	public double reduceToDouble(long parallelismThreshold,
3679	>	ToDoubleBiFunction<? super K, ? super V> transformer,
3680		double basis,
3681	<	DoubleByDoubleToDouble reducer) {
3682	<	return ForkJoinTasks.reduceToDouble
3683	<	(this, transformer, basis, reducer).invoke();
3681	>	DoubleBinaryOperator reducer) {
3682	>	if (transformer == null || reducer == null)
3683	>	throw new NullPointerException();
3684	>	return new MapReduceMappingsToDoubleTask<K,V>
3685	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3686	>	null, transformer, basis, reducer).invoke();
3687		}
3688
3689		/**
#	Line 3533 | Line 3691 | public class ConcurrentHashMap<K, V>
3691		* of all (key, value) pairs using the given reducer to
3692		* combine values, and the given basis as an identity value.
3693		*
3694	+	* @param parallelismThreshold the (estimated) number of elements
3695	+	* needed for this operation to be executed in parallel
3696		* @param transformer a function returning the transformation
3697		* for an element
3698		* @param basis the identity (initial default value) for the reduction
3699		* @param reducer a commutative associative combining function
3700		* @return the result of accumulating the given transformation
3701		* of all (key, value) pairs
3702	+	* @since 1.8
3703		*/
3704	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3704	>	public long reduceToLong(long parallelismThreshold,
3705	>	ToLongBiFunction<? super K, ? super V> transformer,
3706		long basis,
3707	<	LongByLongToLong reducer) {
3708	<	return ForkJoinTasks.reduceToLong
3709	<	(this, transformer, basis, reducer).invoke();
3707	>	LongBinaryOperator reducer) {
3708	>	if (transformer == null || reducer == null)
3709	>	throw new NullPointerException();
3710	>	return new MapReduceMappingsToLongTask<K,V>
3711	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3712	>	null, transformer, basis, reducer).invoke();
3713		}
3714
3715		/**
#	Line 3552 | Line 3717 | public class ConcurrentHashMap<K, V>
3717		* of all (key, value) pairs using the given reducer to
3718		* combine values, and the given basis as an identity value.
3719		*
3720	+	* @param parallelismThreshold the (estimated) number of elements
3721	+	* needed for this operation to be executed in parallel
3722		* @param transformer a function returning the transformation
3723		* for an element
3724		* @param basis the identity (initial default value) for the reduction
3725		* @param reducer a commutative associative combining function
3726		* @return the result of accumulating the given transformation
3727		* of all (key, value) pairs
3728	+	* @since 1.8
3729		*/
3730	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3730	>	public int reduceToInt(long parallelismThreshold,
3731	>	ToIntBiFunction<? super K, ? super V> transformer,
3732		int basis,
3733	<	IntByIntToInt reducer) {
3734	<	return ForkJoinTasks.reduceToInt
3735	<	(this, transformer, basis, reducer).invoke();
3733	>	IntBinaryOperator reducer) {
3734	>	if (transformer == null || reducer == null)
3735	>	throw new NullPointerException();
3736	>	return new MapReduceMappingsToIntTask<K,V>
3737	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3738	>	null, transformer, basis, reducer).invoke();
3739		}
3740
3741		/**
3742		* Performs the given action for each key.
3743		*
3744	+	* @param parallelismThreshold the (estimated) number of elements
3745	+	* needed for this operation to be executed in parallel
3746		* @param action the action
3747	+	* @since 1.8
3748		*/
3749	<	public void forEachKey(Action<K> action) {
3750	<	ForkJoinTasks.forEachKey
3751	<	(this, action).invoke();
3749	>	public void forEachKey(long parallelismThreshold,
3750	>	Consumer<? super K> action) {
3751	>	if (action == null) throw new NullPointerException();
3752	>	new ForEachKeyTask<K,V>
3753	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3754	>	action).invoke();
3755		}
3756
3757		/**
3758		* Performs the given action for each non-null transformation
3759		* of each key.
3760		*
3761	+	* @param parallelismThreshold the (estimated) number of elements
3762	+	* needed for this operation to be executed in parallel
3763		* @param transformer a function returning the transformation
3764	<	* for an element, or null of there is no transformation (in
3765	<	* which case the action is not applied).
3764	>	* for an element, or null if there is no transformation (in
3765	>	* which case the action is not applied)
3766		* @param action the action
3767	+	* @param <U> the return type of the transformer
3768	+	* @since 1.8
3769		*/
3770	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3771	<	Action<U> action) {
3772	<	ForkJoinTasks.forEachKey
3773	<	(this, transformer, action).invoke();
3770	>	public <U> void forEachKey(long parallelismThreshold,
3771	>	Function<? super K, ? extends U> transformer,
3772	>	Consumer<? super U> action) {
3773	>	if (transformer == null || action == null)
3774	>	throw new NullPointerException();
3775	>	new ForEachTransformedKeyTask<K,V,U>
3776	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3777	>	transformer, action).invoke();
3778		}
3779
3780		/**
#	Line 3598 | Line 3784 | public class ConcurrentHashMap<K, V>
3784		* any other parallel invocations of the search function are
3785		* ignored.
3786		*
3787	+	* @param parallelismThreshold the (estimated) number of elements
3788	+	* needed for this operation to be executed in parallel
3789		* @param searchFunction a function returning a non-null
3790		* result on success, else null
3791	+	* @param <U> the return type of the search function
3792		* @return a non-null result from applying the given search
3793		* function on each key, or null if none
3794	+	* @since 1.8
3795		*/
3796	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3797	<	return ForkJoinTasks.searchKeys
3798	<	(this, searchFunction).invoke();
3796	>	public <U> U searchKeys(long parallelismThreshold,
3797	>	Function<? super K, ? extends U> searchFunction) {
3798	>	if (searchFunction == null) throw new NullPointerException();
3799	>	return new SearchKeysTask<K,V,U>
3800	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3801	>	searchFunction, new AtomicReference<U>()).invoke();
3802		}
3803
3804		/**
3805		* Returns the result of accumulating all keys using the given
3806		* reducer to combine values, or null if none.
3807		*
3808	+	* @param parallelismThreshold the (estimated) number of elements
3809	+	* needed for this operation to be executed in parallel
3810		* @param reducer a commutative associative combining function
3811		* @return the result of accumulating all keys using the given
3812		* reducer to combine values, or null if none
3813	+	* @since 1.8
3814		*/
3815	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3816	<	return ForkJoinTasks.reduceKeys
3817	<	(this, reducer).invoke();
3815	>	public K reduceKeys(long parallelismThreshold,
3816	>	BiFunction<? super K, ? super K, ? extends K> reducer) {
3817	>	if (reducer == null) throw new NullPointerException();
3818	>	return new ReduceKeysTask<K,V>
3819	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3820	>	null, reducer).invoke();
3821		}
3822
3823		/**
#	Line 3626 | Line 3825 | public class ConcurrentHashMap<K, V>
3825		* of all keys using the given reducer to combine values, or
3826		* null if none.
3827		*
3828	+	* @param parallelismThreshold the (estimated) number of elements
3829	+	* needed for this operation to be executed in parallel
3830		* @param transformer a function returning the transformation
3831	<	* for an element, or null of there is no transformation (in
3832	<	* which case it is not combined).
3831	>	* for an element, or null if there is no transformation (in
3832	>	* which case it is not combined)
3833		* @param reducer a commutative associative combining function
3834	+	* @param <U> the return type of the transformer
3835		* @return the result of accumulating the given transformation
3836		* of all keys
3837	+	* @since 1.8
3838		*/
3839	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3840	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3841	<	return ForkJoinTasks.reduceKeys
3842	<	(this, transformer, reducer).invoke();
3839	>	public <U> U reduceKeys(long parallelismThreshold,
3840	>	Function<? super K, ? extends U> transformer,
3841	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
3842	>	if (transformer == null || reducer == null)
3843	>	throw new NullPointerException();
3844	>	return new MapReduceKeysTask<K,V,U>
3845	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3846	>	null, transformer, reducer).invoke();
3847		}
3848
3849		/**
#	Line 3644 | Line 3851 | public class ConcurrentHashMap<K, V>
3851		* of all keys using the given reducer to combine values, and
3852		* the given basis as an identity value.
3853		*
3854	+	* @param parallelismThreshold the (estimated) number of elements
3855	+	* needed for this operation to be executed in parallel
3856		* @param transformer a function returning the transformation
3857		* for an element
3858		* @param basis the identity (initial default value) for the reduction
3859		* @param reducer a commutative associative combining function
3860	<	* @return  the result of accumulating the given transformation
3860	>	* @return the result of accumulating the given transformation
3861		* of all keys
3862	+	* @since 1.8
3863		*/
3864	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3864	>	public double reduceKeysToDouble(long parallelismThreshold,
3865	>	ToDoubleFunction<? super K> transformer,
3866		double basis,
3867	<	DoubleByDoubleToDouble reducer) {
3868	<	return ForkJoinTasks.reduceKeysToDouble
3869	<	(this, transformer, basis, reducer).invoke();
3867	>	DoubleBinaryOperator reducer) {
3868	>	if (transformer == null || reducer == null)
3869	>	throw new NullPointerException();
3870	>	return new MapReduceKeysToDoubleTask<K,V>
3871	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3872	>	null, transformer, basis, reducer).invoke();
3873		}
3874
3875		/**
#	Line 3663 | Line 3877 | public class ConcurrentHashMap<K, V>
3877		* of all keys using the given reducer to combine values, and
3878		* the given basis as an identity value.
3879		*
3880	+	* @param parallelismThreshold the (estimated) number of elements
3881	+	* needed for this operation to be executed in parallel
3882		* @param transformer a function returning the transformation
3883		* for an element
3884		* @param basis the identity (initial default value) for the reduction
3885		* @param reducer a commutative associative combining function
3886		* @return the result of accumulating the given transformation
3887		* of all keys
3888	+	* @since 1.8
3889		*/
3890	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3890	>	public long reduceKeysToLong(long parallelismThreshold,
3891	>	ToLongFunction<? super K> transformer,
3892		long basis,
3893	<	LongByLongToLong reducer) {
3894	<	return ForkJoinTasks.reduceKeysToLong
3895	<	(this, transformer, basis, reducer).invoke();
3893	>	LongBinaryOperator reducer) {
3894	>	if (transformer == null || reducer == null)
3895	>	throw new NullPointerException();
3896	>	return new MapReduceKeysToLongTask<K,V>
3897	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3898	>	null, transformer, basis, reducer).invoke();
3899		}
3900
3901		/**
#	Line 3682 | Line 3903 | public class ConcurrentHashMap<K, V>
3903		* of all keys using the given reducer to combine values, and
3904		* the given basis as an identity value.
3905		*
3906	+	* @param parallelismThreshold the (estimated) number of elements
3907	+	* needed for this operation to be executed in parallel
3908		* @param transformer a function returning the transformation
3909		* for an element
3910		* @param basis the identity (initial default value) for the reduction
3911		* @param reducer a commutative associative combining function
3912		* @return the result of accumulating the given transformation
3913		* of all keys
3914	+	* @since 1.8
3915		*/
3916	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3916	>	public int reduceKeysToInt(long parallelismThreshold,
3917	>	ToIntFunction<? super K> transformer,
3918		int basis,
3919	<	IntByIntToInt reducer) {
3920	<	return ForkJoinTasks.reduceKeysToInt
3921	<	(this, transformer, basis, reducer).invoke();
3919	>	IntBinaryOperator reducer) {
3920	>	if (transformer == null || reducer == null)
3921	>	throw new NullPointerException();
3922	>	return new MapReduceKeysToIntTask<K,V>
3923	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3924	>	null, transformer, basis, reducer).invoke();
3925		}
3926
3927		/**
3928		* Performs the given action for each value.
3929		*
3930	+	* @param parallelismThreshold the (estimated) number of elements
3931	+	* needed for this operation to be executed in parallel
3932		* @param action the action
3933	+	* @since 1.8
3934		*/
3935	<	public void forEachValue(Action<V> action) {
3936	<	ForkJoinTasks.forEachValue
3937	<	(this, action).invoke();
3935	>	public void forEachValue(long parallelismThreshold,
3936	>	Consumer<? super V> action) {
3937	>	if (action == null)
3938	>	throw new NullPointerException();
3939	>	new ForEachValueTask<K,V>
3940	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3941	>	action).invoke();
3942		}
3943
3944		/**
3945		* Performs the given action for each non-null transformation
3946		* of each value.
3947		*
3948	+	* @param parallelismThreshold the (estimated) number of elements
3949	+	* needed for this operation to be executed in parallel
3950		* @param transformer a function returning the transformation
3951	<	* for an element, or null of there is no transformation (in
3952	<	* which case the action is not applied).
3951	>	* for an element, or null if there is no transformation (in
3952	>	* which case the action is not applied)
3953	>	* @param action the action
3954	>	* @param <U> the return type of the transformer
3955	>	* @since 1.8
3956		*/
3957	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3958	<	Action<U> action) {
3959	<	ForkJoinTasks.forEachValue
3960	<	(this, transformer, action).invoke();
3957	>	public <U> void forEachValue(long parallelismThreshold,
3958	>	Function<? super V, ? extends U> transformer,
3959	>	Consumer<? super U> action) {
3960	>	if (transformer == null || action == null)
3961	>	throw new NullPointerException();
3962	>	new ForEachTransformedValueTask<K,V,U>
3963	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3964	>	transformer, action).invoke();
3965		}
3966
3967		/**
#	Line 3727 | Line 3971 | public class ConcurrentHashMap<K, V>
3971		* any other parallel invocations of the search function are
3972		* ignored.
3973		*
3974	+	* @param parallelismThreshold the (estimated) number of elements
3975	+	* needed for this operation to be executed in parallel
3976		* @param searchFunction a function returning a non-null
3977		* result on success, else null
3978	+	* @param <U> the return type of the search function
3979		* @return a non-null result from applying the given search
3980		* function on each value, or null if none
3981	<	*
3981	>	* @since 1.8
3982		*/
3983	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3984	<	return ForkJoinTasks.searchValues
3985	<	(this, searchFunction).invoke();
3983	>	public <U> U searchValues(long parallelismThreshold,
3984	>	Function<? super V, ? extends U> searchFunction) {
3985	>	if (searchFunction == null) throw new NullPointerException();
3986	>	return new SearchValuesTask<K,V,U>
3987	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3988	>	searchFunction, new AtomicReference<U>()).invoke();
3989		}
3990
3991		/**
3992		* Returns the result of accumulating all values using the
3993		* given reducer to combine values, or null if none.
3994		*
3995	+	* @param parallelismThreshold the (estimated) number of elements
3996	+	* needed for this operation to be executed in parallel
3997		* @param reducer a commutative associative combining function
3998	<	* @return  the result of accumulating all values
3998	>	* @return the result of accumulating all values
3999	>	* @since 1.8
4000		*/
4001	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
4002	<	return ForkJoinTasks.reduceValues
4003	<	(this, reducer).invoke();
4001	>	public V reduceValues(long parallelismThreshold,
4002	>	BiFunction<? super V, ? super V, ? extends V> reducer) {
4003	>	if (reducer == null) throw new NullPointerException();
4004	>	return new ReduceValuesTask<K,V>
4005	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4006	>	null, reducer).invoke();
4007		}
4008
4009		/**
#	Line 3755 | Line 4011 | public class ConcurrentHashMap<K, V>
4011		* of all values using the given reducer to combine values, or
4012		* null if none.
4013		*
4014	+	* @param parallelismThreshold the (estimated) number of elements
4015	+	* needed for this operation to be executed in parallel
4016		* @param transformer a function returning the transformation
4017	<	* for an element, or null of there is no transformation (in
4018	<	* which case it is not combined).
4017	>	* for an element, or null if there is no transformation (in
4018	>	* which case it is not combined)
4019		* @param reducer a commutative associative combining function
4020	+	* @param <U> the return type of the transformer
4021		* @return the result of accumulating the given transformation
4022		* of all values
4023	+	* @since 1.8
4024		*/
4025	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
4026	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4027	<	return ForkJoinTasks.reduceValues
4028	<	(this, transformer, reducer).invoke();
4025	>	public <U> U reduceValues(long parallelismThreshold,
4026	>	Function<? super V, ? extends U> transformer,
4027	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
4028	>	if (transformer == null || reducer == null)
4029	>	throw new NullPointerException();
4030	>	return new MapReduceValuesTask<K,V,U>
4031	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4032	>	null, transformer, reducer).invoke();
4033		}
4034
4035		/**
#	Line 3773 | Line 4037 | public class ConcurrentHashMap<K, V>
4037		* of all values using the given reducer to combine values,
4038		* and the given basis as an identity value.
4039		*
4040	+	* @param parallelismThreshold the (estimated) number of elements
4041	+	* needed for this operation to be executed in parallel
4042		* @param transformer a function returning the transformation
4043		* for an element
4044		* @param basis the identity (initial default value) for the reduction
4045		* @param reducer a commutative associative combining function
4046		* @return the result of accumulating the given transformation
4047		* of all values
4048	+	* @since 1.8
4049		*/
4050	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
4050	>	public double reduceValuesToDouble(long parallelismThreshold,
4051	>	ToDoubleFunction<? super V> transformer,
4052		double basis,
4053	<	DoubleByDoubleToDouble reducer) {
4054	<	return ForkJoinTasks.reduceValuesToDouble
4055	<	(this, transformer, basis, reducer).invoke();
4053	>	DoubleBinaryOperator reducer) {
4054	>	if (transformer == null || reducer == null)
4055	>	throw new NullPointerException();
4056	>	return new MapReduceValuesToDoubleTask<K,V>
4057	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4058	>	null, transformer, basis, reducer).invoke();
4059		}
4060
4061		/**
#	Line 3792 | Line 4063 | public class ConcurrentHashMap<K, V>
4063		* of all values using the given reducer to combine values,
4064		* and the given basis as an identity value.
4065		*
4066	+	* @param parallelismThreshold the (estimated) number of elements
4067	+	* needed for this operation to be executed in parallel
4068		* @param transformer a function returning the transformation
4069		* for an element
4070		* @param basis the identity (initial default value) for the reduction
4071		* @param reducer a commutative associative combining function
4072		* @return the result of accumulating the given transformation
4073		* of all values
4074	+	* @since 1.8
4075		*/
4076	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
4076	>	public long reduceValuesToLong(long parallelismThreshold,
4077	>	ToLongFunction<? super V> transformer,
4078		long basis,
4079	<	LongByLongToLong reducer) {
4080	<	return ForkJoinTasks.reduceValuesToLong
4081	<	(this, transformer, basis, reducer).invoke();
4079	>	LongBinaryOperator reducer) {
4080	>	if (transformer == null || reducer == null)
4081	>	throw new NullPointerException();
4082	>	return new MapReduceValuesToLongTask<K,V>
4083	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4084	>	null, transformer, basis, reducer).invoke();
4085		}
4086
4087		/**
#	Line 3811 | Line 4089 | public class ConcurrentHashMap<K, V>
4089		* of all values using the given reducer to combine values,
4090		* and the given basis as an identity value.
4091		*
4092	+	* @param parallelismThreshold the (estimated) number of elements
4093	+	* needed for this operation to be executed in parallel
4094		* @param transformer a function returning the transformation
4095		* for an element
4096		* @param basis the identity (initial default value) for the reduction
4097		* @param reducer a commutative associative combining function
4098		* @return the result of accumulating the given transformation
4099		* of all values
4100	+	* @since 1.8
4101		*/
4102	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
4102	>	public int reduceValuesToInt(long parallelismThreshold,
4103	>	ToIntFunction<? super V> transformer,
4104		int basis,
4105	<	IntByIntToInt reducer) {
4106	<	return ForkJoinTasks.reduceValuesToInt
4107	<	(this, transformer, basis, reducer).invoke();
4105	>	IntBinaryOperator reducer) {
4106	>	if (transformer == null || reducer == null)
4107	>	throw new NullPointerException();
4108	>	return new MapReduceValuesToIntTask<K,V>
4109	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4110	>	null, transformer, basis, reducer).invoke();
4111		}
4112
4113		/**
4114		* Performs the given action for each entry.
4115		*
4116	+	* @param parallelismThreshold the (estimated) number of elements
4117	+	* needed for this operation to be executed in parallel
4118		* @param action the action
4119	+	* @since 1.8
4120		*/
4121	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
4122	<	ForkJoinTasks.forEachEntry
4123	<	(this, action).invoke();
4121	>	public void forEachEntry(long parallelismThreshold,
4122	>	Consumer<? super Map.Entry<K,V>> action) {
4123	>	if (action == null) throw new NullPointerException();
4124	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
4125	>	action).invoke();
4126		}
4127
4128		/**
4129		* Performs the given action for each non-null transformation
4130		* of each entry.
4131		*
4132	+	* @param parallelismThreshold the (estimated) number of elements
4133	+	* needed for this operation to be executed in parallel
4134		* @param transformer a function returning the transformation
4135	<	* for an element, or null of there is no transformation (in
4136	<	* which case the action is not applied).
4135	>	* for an element, or null if there is no transformation (in
4136	>	* which case the action is not applied)
4137		* @param action the action
4138	+	* @param <U> the return type of the transformer
4139	+	* @since 1.8
4140		*/
4141	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
4142	<	Action<U> action) {
4143	<	ForkJoinTasks.forEachEntry
4144	<	(this, transformer, action).invoke();
4141	>	public <U> void forEachEntry(long parallelismThreshold,
4142	>	Function<Map.Entry<K,V>, ? extends U> transformer,
4143	>	Consumer<? super U> action) {
4144	>	if (transformer == null || action == null)
4145	>	throw new NullPointerException();
4146	>	new ForEachTransformedEntryTask<K,V,U>
4147	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4148	>	transformer, action).invoke();
4149		}
4150
4151		/**
#	Line 3857 | Line 4155 | public class ConcurrentHashMap<K, V>
4155		* any other parallel invocations of the search function are
4156		* ignored.
4157		*
4158	+	* @param parallelismThreshold the (estimated) number of elements
4159	+	* needed for this operation to be executed in parallel
4160		* @param searchFunction a function returning a non-null
4161		* result on success, else null
4162	+	* @param <U> the return type of the search function
4163		* @return a non-null result from applying the given search
4164		* function on each entry, or null if none
4165	+	* @since 1.8
4166		*/
4167	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4168	<	return ForkJoinTasks.searchEntries
4169	<	(this, searchFunction).invoke();
4167	>	public <U> U searchEntries(long parallelismThreshold,
4168	>	Function<Map.Entry<K,V>, ? extends U> searchFunction) {
4169	>	if (searchFunction == null) throw new NullPointerException();
4170	>	return new SearchEntriesTask<K,V,U>
4171	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4172	>	searchFunction, new AtomicReference<U>()).invoke();
4173		}
4174
4175		/**
4176		* Returns the result of accumulating all entries using the
4177		* given reducer to combine values, or null if none.
4178		*
4179	+	* @param parallelismThreshold the (estimated) number of elements
4180	+	* needed for this operation to be executed in parallel
4181		* @param reducer a commutative associative combining function
4182		* @return the result of accumulating all entries
4183	+	* @since 1.8
4184		*/
4185	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4186	<	return ForkJoinTasks.reduceEntries
4187	<	(this, reducer).invoke();
4185	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4186	>	BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4187	>	if (reducer == null) throw new NullPointerException();
4188	>	return new ReduceEntriesTask<K,V>
4189	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4190	>	null, reducer).invoke();
4191		}
4192
4193		/**
#	Line 3884 | Line 4195 | public class ConcurrentHashMap<K, V>
4195		* of all entries using the given reducer to combine values,
4196		* or null if none.
4197		*
4198	+	* @param parallelismThreshold the (estimated) number of elements
4199	+	* needed for this operation to be executed in parallel
4200		* @param transformer a function returning the transformation
4201	<	* for an element, or null of there is no transformation (in
4202	<	* which case it is not combined).
4201	>	* for an element, or null if there is no transformation (in
4202	>	* which case it is not combined)
4203		* @param reducer a commutative associative combining function
4204	+	* @param <U> the return type of the transformer
4205		* @return the result of accumulating the given transformation
4206		* of all entries
4207	+	* @since 1.8
4208		*/
4209	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4210	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4211	<	return ForkJoinTasks.reduceEntries
4212	<	(this, transformer, reducer).invoke();
4209	>	public <U> U reduceEntries(long parallelismThreshold,
4210	>	Function<Map.Entry<K,V>, ? extends U> transformer,
4211	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
4212	>	if (transformer == null || reducer == null)
4213	>	throw new NullPointerException();
4214	>	return new MapReduceEntriesTask<K,V,U>
4215	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4216	>	null, transformer, reducer).invoke();
4217		}
4218
4219		/**
#	Line 3902 | Line 4221 | public class ConcurrentHashMap<K, V>
4221		* of all entries using the given reducer to combine values,
4222		* and the given basis as an identity value.
4223		*
4224	+	* @param parallelismThreshold the (estimated) number of elements
4225	+	* needed for this operation to be executed in parallel
4226		* @param transformer a function returning the transformation
4227		* for an element
4228		* @param basis the identity (initial default value) for the reduction
4229		* @param reducer a commutative associative combining function
4230		* @return the result of accumulating the given transformation
4231		* of all entries
4232	+	* @since 1.8
4233		*/
4234	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4234	>	public double reduceEntriesToDouble(long parallelismThreshold,
4235	>	ToDoubleFunction<Map.Entry<K,V>> transformer,
4236		double basis,
4237	<	DoubleByDoubleToDouble reducer) {
4238	<	return ForkJoinTasks.reduceEntriesToDouble
4239	<	(this, transformer, basis, reducer).invoke();
4237	>	DoubleBinaryOperator reducer) {
4238	>	if (transformer == null || reducer == null)
4239	>	throw new NullPointerException();
4240	>	return new MapReduceEntriesToDoubleTask<K,V>
4241	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4242	>	null, transformer, basis, reducer).invoke();
4243		}
4244
4245		/**
#	Line 3921 | Line 4247 | public class ConcurrentHashMap<K, V>
4247		* of all entries using the given reducer to combine values,
4248		* and the given basis as an identity value.
4249		*
4250	+	* @param parallelismThreshold the (estimated) number of elements
4251	+	* needed for this operation to be executed in parallel
4252		* @param transformer a function returning the transformation
4253		* for an element
4254		* @param basis the identity (initial default value) for the reduction
4255		* @param reducer a commutative associative combining function
4256	<	* @return  the result of accumulating the given transformation
4256	>	* @return the result of accumulating the given transformation
4257		* of all entries
4258	+	* @since 1.8
4259		*/
4260	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4260	>	public long reduceEntriesToLong(long parallelismThreshold,
4261	>	ToLongFunction<Map.Entry<K,V>> transformer,
4262		long basis,
4263	<	LongByLongToLong reducer) {
4264	<	return ForkJoinTasks.reduceEntriesToLong
4265	<	(this, transformer, basis, reducer).invoke();
4263	>	LongBinaryOperator reducer) {
4264	>	if (transformer == null || reducer == null)
4265	>	throw new NullPointerException();
4266	>	return new MapReduceEntriesToLongTask<K,V>
4267	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4268	>	null, transformer, basis, reducer).invoke();
4269		}
4270
4271		/**
#	Line 3940 | Line 4273 | public class ConcurrentHashMap<K, V>
4273		* of all entries using the given reducer to combine values,
4274		* and the given basis as an identity value.
4275		*
4276	+	* @param parallelismThreshold the (estimated) number of elements
4277	+	* needed for this operation to be executed in parallel
4278		* @param transformer a function returning the transformation
4279		* for an element
4280		* @param basis the identity (initial default value) for the reduction
4281		* @param reducer a commutative associative combining function
4282		* @return the result of accumulating the given transformation
4283		* of all entries
4284	+	* @since 1.8
4285		*/
4286	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4286	>	public int reduceEntriesToInt(long parallelismThreshold,
4287	>	ToIntFunction<Map.Entry<K,V>> transformer,
4288		int basis,
4289	<	IntByIntToInt reducer) {
4290	<	return ForkJoinTasks.reduceEntriesToInt
4291	<	(this, transformer, basis, reducer).invoke();
4289	>	IntBinaryOperator reducer) {
4290	>	if (transformer == null || reducer == null)
4291	>	throw new NullPointerException();
4292	>	return new MapReduceEntriesToIntTask<K,V>
4293	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4294	>	null, transformer, basis, reducer).invoke();
4295		}
4296
4297	+
4298		/* ----------------Views -------------- */
4299
4300		/**
4301		* Base class for views.
4302		*/
4303	<	static abstract class CHMView<K, V> {
4304	<	final ConcurrentHashMap<K, V> map;
4305	<	CHMView(ConcurrentHashMap<K, V> map)  { this.map = map; }
4303	>	abstract static class CollectionView<K,V,E>
4304	>	implements Collection<E>, java.io.Serializable {
4305	>	private static final long serialVersionUID = 7249069246763182397L;
4306	>	final ConcurrentHashMap<K,V> map;
4307	>	CollectionView(ConcurrentHashMap<K,V> map)  { this.map = map; }
4308
4309		/**
4310		* Returns the map backing this view.
#	Line 3970 | Line 4313 | public class ConcurrentHashMap<K, V>
4313		*/
4314		public ConcurrentHashMap<K,V> getMap() { return map; }
4315
4316	<	public final int size()                 { return map.size(); }
4317	<	public final boolean isEmpty()          { return map.isEmpty(); }
4318	<	public final void clear()               { map.clear(); }
4316	>	/**
4317	>	* Removes all of the elements from this view, by removing all
4318	>	* the mappings from the map backing this view.
4319	>	*/
4320	>	public final void clear()      { map.clear(); }
4321	>	public final int size()        { return map.size(); }
4322	>	public final boolean isEmpty() { return map.isEmpty(); }
4323
4324		// implementations below rely on concrete classes supplying these
4325	<	abstract public Iterator<?> iterator();
4326	<	abstract public boolean contains(Object o);
4327	<	abstract public boolean remove(Object o);
4325	>	// abstract methods
4326	>	/**
4327	>	* Returns an iterator over the elements in this collection.
4328	>	*
4329	>	* <p>The returned iterator is
4330	>	* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>.
4331	>	*
4332	>	* @return an iterator over the elements in this collection
4333	>	*/
4334	>	public abstract Iterator<E> iterator();
4335	>	public abstract boolean contains(Object o);
4336	>	public abstract boolean remove(Object o);
4337
4338		private static final String oomeMsg = "Required array size too large";
4339
4340		public final Object[] toArray() {
4341		long sz = map.mappingCount();
4342	<	if (sz > (long)(MAX_ARRAY_SIZE))
4342	>	if (sz > MAX_ARRAY_SIZE)
4343		throw new OutOfMemoryError(oomeMsg);
4344		int n = (int)sz;
4345		Object[] r = new Object[n];
4346		int i = 0;
4347	<	Iterator<?> it = iterator();
3992	<	while (it.hasNext()) {
4347	>	for (E e : this) {
4348		if (i == n) {
4349		if (n >= MAX_ARRAY_SIZE)
4350		throw new OutOfMemoryError(oomeMsg);
#	Line 3999 | Line 4354 | public class ConcurrentHashMap<K, V>
4354		n += (n >>> 1) + 1;
4355		r = Arrays.copyOf(r, n);
4356		}
4357	<	r[i++] = it.next();
4357	>	r[i++] = e;
4358		}
4359		return (i == n) ? r : Arrays.copyOf(r, i);
4360		}
4361
4362	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4362	>	@SuppressWarnings("unchecked")
4363	>	public final <T> T[] toArray(T[] a) {
4364		long sz = map.mappingCount();
4365	<	if (sz > (long)(MAX_ARRAY_SIZE))
4365	>	if (sz > MAX_ARRAY_SIZE)
4366		throw new OutOfMemoryError(oomeMsg);
4367		int m = (int)sz;
4368		T[] r = (a.length >= m) ? a :
#	Line 4014 | Line 4370 | public class ConcurrentHashMap<K, V>
4370		.newInstance(a.getClass().getComponentType(), m);
4371		int n = r.length;
4372		int i = 0;
4373	<	Iterator<?> it = iterator();
4018	<	while (it.hasNext()) {
4373	>	for (E e : this) {
4374		if (i == n) {
4375		if (n >= MAX_ARRAY_SIZE)
4376		throw new OutOfMemoryError(oomeMsg);
#	Line 4025 | Line 4380 | public class ConcurrentHashMap<K, V>
4380		n += (n >>> 1) + 1;
4381		r = Arrays.copyOf(r, n);
4382		}
4383	<	r[i++] = (T)it.next();
4383	>	r[i++] = (T)e;
4384		}
4385		if (a == r && i < n) {
4386		r[i] = null; // null-terminate
#	Line 4034 | Line 4389 | public class ConcurrentHashMap<K, V>
4389		return (i == n) ? r : Arrays.copyOf(r, i);
4390		}
4391
4392	<	public final int hashCode() {
4393	<	int h = 0;
4394	<	for (Iterator<?> it = iterator(); it.hasNext();)
4395	<	h += it.next().hashCode();
4396	<	return h;
4397	<	}
4398	<
4392	>	/**
4393	>	* Returns a string representation of this collection.
4394	>	* The string representation consists of the string representations
4395	>	* of the collection's elements in the order they are returned by
4396	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4397	>	* Adjacent elements are separated by the characters {@code ", "}
4398	>	* (comma and space).  Elements are converted to strings as by
4399	>	* {@link String#valueOf(Object)}.
4400	>	*
4401	>	* @return a string representation of this collection
4402	>	*/
4403		public final String toString() {
4404		StringBuilder sb = new StringBuilder();
4405		sb.append('[');
4406	<	Iterator<?> it = iterator();
4406	>	Iterator<E> it = iterator();
4407		if (it.hasNext()) {
4408		for (;;) {
4409		Object e = it.next();
#	Line 4059 | Line 4418 | public class ConcurrentHashMap<K, V>
4418
4419		public final boolean containsAll(Collection<?> c) {
4420		if (c != this) {
4421	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
4063	<	Object e = it.next();
4421	>	for (Object e : c) {
4422		if (e == null || !contains(e))
4423		return false;
4424		}
#	Line 4070 | Line 4428 | public class ConcurrentHashMap<K, V>
4428
4429		public final boolean removeAll(Collection<?> c) {
4430		boolean modified = false;
4431	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4431	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4432		if (c.contains(it.next())) {
4433		it.remove();
4434		modified = true;
#	Line 4081 | Line 4439 | public class ConcurrentHashMap<K, V>
4439
4440		public final boolean retainAll(Collection<?> c) {
4441		boolean modified = false;
4442	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4442	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4443		if (!c.contains(it.next())) {
4444		it.remove();
4445		modified = true;
#	Line 4095 | Line 4453 | public class ConcurrentHashMap<K, V>
4453		/**
4454		* A view of a ConcurrentHashMap as a {@link Set} of keys, in
4455		* which additions may optionally be enabled by mapping to a
4456	<	* common value.  This class cannot be directly instantiated. See
4457	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4458	<	* {@link #newKeySet(int)}.
4456	>	* common value.  This class cannot be directly instantiated.
4457	>	* See {@link #keySet() keySet()},
4458	>	* {@link #keySet(Object) keySet(V)},
4459	>	* {@link #newKeySet() newKeySet()},
4460	>	* {@link #newKeySet(int) newKeySet(int)}.
4461	>	*
4462	>	* @since 1.8
4463		*/
4464	<	public static class KeySetView<K,V> extends CHMView<K,V> implements Set<K>, java.io.Serializable {
4464	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4465	>	implements Set<K>, java.io.Serializable {
4466		private static final long serialVersionUID = 7249069246763182397L;
4467		private final V value;
4468	<	KeySetView(ConcurrentHashMap<K, V> map, V value) {  // non-public
4468	>	KeySetView(ConcurrentHashMap<K,V> map, V value) {  // non-public
4469		super(map);
4470		this.value = value;
4471		}
#	Line 4112 | Line 4475 | public class ConcurrentHashMap<K, V>
4475		* or {@code null} if additions are not supported.
4476		*
4477		* @return the default mapped value for additions, or {@code null}
4478	<	* if not supported.
4478	>	* if not supported
4479		*/
4480		public V getMappedValue() { return value; }
4481
4482	<	// implement Set API
4483	<
4482	>	/**
4483	>	* {@inheritDoc}
4484	>	* @throws NullPointerException if the specified key is null
4485	>	*/
4486		public boolean contains(Object o) { return map.containsKey(o); }
4122	–	public boolean remove(Object o)   { return map.remove(o) != null; }
4487
4488		/**
4489	<	* Returns a "weakly consistent" iterator that will never
4490	<	* throw {@link ConcurrentModificationException}, and
4491	<	* guarantees to traverse elements as they existed upon
4492	<	* construction of the iterator, and may (but is not
4493	<	* guaranteed to) reflect any modifications subsequent to
4494	<	* construction.
4489	>	* Removes the key from this map view, by removing the key (and its
4490	>	* corresponding value) from the backing map.  This method does
4491	>	* nothing if the key is not in the map.
4492	>	*
4493	>	* @param  o the key to be removed from the backing map
4494	>	* @return {@code true} if the backing map contained the specified key
4495	>	* @throws NullPointerException if the specified key is null
4496	>	*/
4497	>	public boolean remove(Object o) { return map.remove(o) != null; }
4498	>
4499	>	/**
4500	>	* @return an iterator over the keys of the backing map
4501	>	*/
4502	>	public Iterator<K> iterator() {
4503	>	Node<K,V>[] t;
4504	>	ConcurrentHashMap<K,V> m = map;
4505	>	int f = (t = m.table) == null ? 0 : t.length;
4506	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4507	>	}
4508	>
4509	>	/**
4510	>	* Adds the specified key to this set view by mapping the key to
4511	>	* the default mapped value in the backing map, if defined.
4512		*
4513	<	* @return an iterator over the keys of this map
4513	>	* @param e key to be added
4514	>	* @return {@code true} if this set changed as a result of the call
4515	>	* @throws NullPointerException if the specified key is null
4516	>	* @throws UnsupportedOperationException if no default mapped value
4517	>	* for additions was provided
4518		*/
4134	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4519		public boolean add(K e) {
4520		V v;
4521		if ((v = value) == null)
4522		throw new UnsupportedOperationException();
4523	<	if (e == null)
4140	<	throw new NullPointerException();
4141	<	return map.internalPutIfAbsent(e, v) == null;
4523	>	return map.putVal(e, v, true) == null;
4524		}
4525	+
4526	+	/**
4527	+	* Adds all of the elements in the specified collection to this set,
4528	+	* as if by calling {@link #add} on each one.
4529	+	*
4530	+	* @param c the elements to be inserted into this set
4531	+	* @return {@code true} if this set changed as a result of the call
4532	+	* @throws NullPointerException if the collection or any of its
4533	+	* elements are {@code null}
4534	+	* @throws UnsupportedOperationException if no default mapped value
4535	+	* for additions was provided
4536	+	*/
4537		public boolean addAll(Collection<? extends K> c) {
4538		boolean added = false;
4539		V v;
4540		if ((v = value) == null)
4541		throw new UnsupportedOperationException();
4542		for (K e : c) {
4543	<	if (e == null)
4150	<	throw new NullPointerException();
4151	<	if (map.internalPutIfAbsent(e, v) == null)
4543	>	if (map.putVal(e, v, true) == null)
4544		added = true;
4545		}
4546		return added;
4547		}
4548	+
4549	+	public int hashCode() {
4550	+	int h = 0;
4551	+	for (K e : this)
4552	+	h += e.hashCode();
4553	+	return h;
4554	+	}
4555	+
4556		public boolean equals(Object o) {
4557		Set<?> c;
4558		return ((o instanceof Set) &&
#	Line 4160 | Line 4560 | public class ConcurrentHashMap<K, V>
4560		(containsAll(c) && c.containsAll(this))));
4561		}
4562
4563	<	/**
4564	<	* Performs the given action for each key.
4565	<	*
4566	<	* @param action the action
4567	<	*/
4568	<	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();
4186	<	}
4187	<
4188	<	/**
4189	<	* Returns a non-null result from applying the given search
4190	<	* function on each key, or null if none. Upon success,
4191	<	* further element processing is suppressed and the results of
4192	<	* any other parallel invocations of the search function are
4193	<	* ignored.
4194	<	*
4195	<	* @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();
4563	>	public Spliterator<K> spliterator() {
4564	>	Node<K,V>[] t;
4565	>	ConcurrentHashMap<K,V> m = map;
4566	>	long n = m.sumCount();
4567	>	int f = (t = m.table) == null ? 0 : t.length;
4568	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4569		}
4570
4571	<	/**
4572	<	* Returns the result of accumulating the given transformation
4573	<	* of all keys using the given reducer to combine values, and
4574	<	* the given basis as an identity value.
4575	<	*
4576	<	* @param transformer a function returning the transformation
4577	<	* for an element
4578	<	* @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();
4571	>	public void forEach(Consumer<? super K> action) {
4572	>	if (action == null) throw new NullPointerException();
4573	>	Node<K,V>[] t;
4574	>	if ((t = map.table) != null) {
4575	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4576	>	for (Node<K,V> p; (p = it.advance()) != null; )
4577	>	action.accept(p.key);
4578	>	}
4579		}
4275	–
4580		}
4581
4582		/**
4583		* A view of a ConcurrentHashMap as a {@link Collection} of
4584		* values, in which additions are disabled. This class cannot be
4585	<	* directly instantiated. See {@link #values},
4586	<	*
4587	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4588	<	* that will never throw {@link ConcurrentModificationException},
4589	<	* and guarantees to traverse elements as they existed upon
4590	<	* construction of the iterator, and may (but is not guaranteed to)
4591	<	* reflect any modifications subsequent to construction.
4592	<	*/
4593	<	public static final class ValuesView<K,V> extends CHMView<K,V>
4594	<	implements Collection<V> {
4291	<	ValuesView(ConcurrentHashMap<K, V> map)   { super(map); }
4292	<	public final boolean contains(Object o) { return map.containsValue(o); }
4585	>	* directly instantiated. See {@link #values()}.
4586	>	*/
4587	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4588	>	implements Collection<V>, java.io.Serializable {
4589	>	private static final long serialVersionUID = 2249069246763182397L;
4590	>	ValuesView(ConcurrentHashMap<K,V> map) { super(map); }
4591	>	public final boolean contains(Object o) {
4592	>	return map.containsValue(o);
4593	>	}
4594	>
4595		public final boolean remove(Object o) {
4596		if (o != null) {
4597	<	Iterator<V> it = new ValueIterator<K,V>(map);
4296	<	while (it.hasNext()) {
4597	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4598		if (o.equals(it.next())) {
4599		it.remove();
4600		return true;
#	Line 4303 | Line 4604 | public class ConcurrentHashMap<K, V>
4604		return false;
4605		}
4606
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	–	*/
4607		public final Iterator<V> iterator() {
4608	<	return new ValueIterator<K,V>(map);
4608	>	ConcurrentHashMap<K,V> m = map;
4609	>	Node<K,V>[] t;
4610	>	int f = (t = m.table) == null ? 0 : t.length;
4611	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4612		}
4613	+
4614		public final boolean add(V e) {
4615		throw new UnsupportedOperationException();
4616		}
#	Line 4323 | Line 4618 | public class ConcurrentHashMap<K, V>
4618		throw new UnsupportedOperationException();
4619		}
4620
4621	<	/**
4622	<	* Performs the given action for each value.
4623	<	*
4624	<	* @param action the action
4625	<	*/
4626	<	public void forEach(Action<V> action) {
4332	<	ForkJoinTasks.forEachValue
4333	<	(map, action).invoke();
4334	<	}
4335	<
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();
4621	>	public Spliterator<V> spliterator() {
4622	>	Node<K,V>[] t;
4623	>	ConcurrentHashMap<K,V> m = map;
4624	>	long n = m.sumCount();
4625	>	int f = (t = m.table) == null ? 0 : t.length;
4626	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4627		}
4628
4629	<	/**
4630	<	* Returns the result of accumulating the given transformation
4631	<	* of all values using the given reducer to combine values,
4632	<	* and the given basis as an identity value.
4633	<	*
4634	<	* @param transformer a function returning the transformation
4635	<	* for an element
4636	<	* @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();
4415	<	}
4416	<
4417	<	/**
4418	<	* Returns the result of accumulating the given transformation
4419	<	* of all values using the given reducer to combine values,
4420	<	* and the given basis as an identity value.
4421	<	*
4422	<	* @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();
4434	<	}
4435	<
4436	<	/**
4437	<	* Returns the result of accumulating the given transformation
4438	<	* of all values using the given reducer to combine values,
4439	<	* and the given basis as an identity value.
4440	<	*
4441	<	* @param transformer a function returning the transformation
4442	<	* for an element
4443	<	* @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();
4629	>	public void forEach(Consumer<? super V> action) {
4630	>	if (action == null) throw new NullPointerException();
4631	>	Node<K,V>[] t;
4632	>	if ((t = map.table) != null) {
4633	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4634	>	for (Node<K,V> p; (p = it.advance()) != null; )
4635	>	action.accept(p.val);
4636	>	}
4637		}
4454	–
4638		}
4639
4640		/**
4641		* A view of a ConcurrentHashMap as a {@link Set} of (key, value)
4642		* entries.  This class cannot be directly instantiated. See
4643	<	* {@link #entrySet}.
4643	>	* {@link #entrySet()}.
4644		*/
4645	<	public static final class EntrySetView<K,V> extends CHMView<K,V>
4646	<	implements Set<Map.Entry<K,V>> {
4647	<	EntrySetView(ConcurrentHashMap<K, V> map) { super(map); }
4648	<	public final boolean contains(Object o) {
4645	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4646	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4647	>	private static final long serialVersionUID = 2249069246763182397L;
4648	>	EntrySetView(ConcurrentHashMap<K,V> map) { super(map); }
4649	>
4650	>	public boolean contains(Object o) {
4651		Object k, v, r; Map.Entry<?,?> e;
4652		return ((o instanceof Map.Entry) &&
4653		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4470 | Line 4655 | public class ConcurrentHashMap<K, V>
4655		(v = e.getValue()) != null &&
4656		(v == r || v.equals(r)));
4657		}
4658	<	public final boolean remove(Object o) {
4658	>
4659	>	public boolean remove(Object o) {
4660		Object k, v; Map.Entry<?,?> e;
4661		return ((o instanceof Map.Entry) &&
4662		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4479 | Line 4665 | public class ConcurrentHashMap<K, V>
4665		}
4666
4667		/**
4668	<	* 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
4668	>	* @return an iterator over the entries of the backing map
4669		*/
4670	<	public final Iterator<Map.Entry<K,V>> iterator() {
4671	<	return new EntryIterator<K,V>(map);
4670	>	public Iterator<Map.Entry<K,V>> iterator() {
4671	>	ConcurrentHashMap<K,V> m = map;
4672	>	Node<K,V>[] t;
4673	>	int f = (t = m.table) == null ? 0 : t.length;
4674	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4675		}
4676
4677	<	public final boolean add(Entry<K,V> e) {
4678	<	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;
4677	>	public boolean add(Entry<K,V> e) {
4678	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4679		}
4680	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4680	>
4681	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4682		boolean added = false;
4683		for (Entry<K,V> e : c) {
4684		if (add(e))
#	Line 4507 | Line 4686 | public class ConcurrentHashMap<K, V>
4686		}
4687		return added;
4688		}
4689	<	public boolean equals(Object o) {
4689	>
4690	>	public final int hashCode() {
4691	>	int h = 0;
4692	>	Node<K,V>[] t;
4693	>	if ((t = map.table) != null) {
4694	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4695	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4696	>	h += p.hashCode();
4697	>	}
4698	>	}
4699	>	return h;
4700	>	}
4701	>
4702	>	public final boolean equals(Object o) {
4703		Set<?> c;
4704		return ((o instanceof Set) &&
4705		((c = (Set<?>)o) == this ||
4706		(containsAll(c) && c.containsAll(this))));
4707		}
4708
4709	<	/**
4710	<	* Performs the given action for each entry.
4711	<	*
4712	<	* @param action the action
4713	<	*/
4714	<	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	<	}
4541	<
4542	<	/**
4543	<	* 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();
4557	<	}
4558	<
4559	<	/**
4560	<	* Returns the result of accumulating all entries using the
4561	<	* given reducer to combine values, or null if none.
4562	<	*
4563	<	* @param reducer a commutative associative combining function
4564	<	* @return the result of accumulating all entries
4565	<	*/
4566	<	public Map.Entry<K,V> reduce(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4567	<	return ForkJoinTasks.reduceEntries
4568	<	(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);
4709	>	public Spliterator<Map.Entry<K,V>> spliterator() {
4710	>	Node<K,V>[] t;
4711	>	ConcurrentHashMap<K,V> m = map;
4712	>	long n = m.sumCount();
4713	>	int f = (t = m.table) == null ? 0 : t.length;
4714	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4715		}
4716
4717	<	/**
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) {
4717	>	public void forEach(Consumer<? super Map.Entry<K,V>> action) {
4718		if (action == null) throw new NullPointerException();
4719	<	return new ForEachKeyTask<K,V>(map, null, -1, null, action);
4720	<	}
4721	<
4722	<	/**
4723	<	* Returns a task that when invoked, performs the given action
4724	<	* 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);
4930	<	}
4931	<
4932	<	/**
4933	<	* Returns a task that when invoked, returns the result of
4934	<	* accumulating the given transformation of all keys using the given
4935	<	* reducer to combine values, and the given basis as an
4936	<	* 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);
4954	<	}
4955	<
4956	<	/**
4957	<	* Returns a task that when invoked, returns the result of
4958	<	* accumulating the given transformation of all keys using the given
4959	<	* reducer to combine values, and the given basis as an
4960	<	* identity value.
4961	<	*
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);
4978	<	}
4979	<
4980	<	/**
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) {
4990	<	if (action == null) throw new NullPointerException();
4991	<	return new ForEachValueTask<K,V>(map, null, -1, null, action);
4992	<	}
4993	<
4994	<	/**
4995	<	* Returns a task that when invoked, performs the given action
4996	<	* 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);
4719	>	Node<K,V>[] t;
4720	>	if ((t = map.table) != null) {
4721	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4722	>	for (Node<K,V> p; (p = it.advance()) != null; )
4723	>	action.accept(new MapEntry<K,V>(p.key, p.val, map));
4724	>	}
4725		}
4726
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	–	}
4727		}
4728
4729		// -------------------------------------------------------
4730
4731		/**
4732	<	* Base for FJ tasks for bulk operations. This adds a variant of
4733	<	* CountedCompleters and some split and merge bookkeeping to
4734	<	* iterator functionality. The forEach and reduce methods are
4735	<	* similar to those illustrated in CountedCompleter documentation,
4736	<	* except that bottom-up reduction completions perform them within
4737	<	* their compute methods. The search methods are like forEach
4738	<	* except they continually poll for success and exit early.  Also,
4739	<	* exceptions are handled in a simpler manner, by just trying to
4740	<	* complete root task exceptionally.
4741	<	*/
4742	<	@SuppressWarnings("serial") static abstract class BulkTask<K,V,R> extends Traverser<K,V,R> {
4743	<	final BulkTask<K,V,?> parent;  // completion target
4744	<	int batch;                     // split control; -1 for unknown
4745	<	int pending;                   // completion control
4746	<
4747	<	BulkTask(ConcurrentHashMap<K,V> map, BulkTask<K,V,?> parent,
4748	<	int batch) {
4749	<	super(map);
4750	<	this.parent = parent;
4751	<	this.batch = batch;
4752	<	if (parent != null && map != null) { // split parent
4753	<	Node[] t;
4754	<	if ((t = parent.tab) == null &&
4755	<	(t = parent.tab = map.table) != null)
4756	<	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;
4732	>	* Base class for bulk tasks. Repeats some fields and code from
4733	>	* class Traverser, because we need to subclass CountedCompleter.
4734	>	*/
4735	>	@SuppressWarnings("serial")
4736	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4737	>	Node<K,V>[] tab;        // same as Traverser
4738	>	Node<K,V> next;
4739	>	TableStack<K,V> stack, spare;
4740	>	int index;
4741	>	int baseIndex;
4742	>	int baseLimit;
4743	>	final int baseSize;
4744	>	int batch;              // split control
4745	>
4746	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4747	>	super(par);
4748	>	this.batch = b;
4749	>	this.index = this.baseIndex = i;
4750	>	if ((this.tab = t) == null)
4751	>	this.baseSize = this.baseLimit = 0;
4752	>	else if (par == null)
4753	>	this.baseSize = this.baseLimit = t.length;
4754	>	else {
4755	>	this.baseLimit = f;
4756	>	this.baseSize = par.baseSize;
4757		}
4758		}
4759
4760		/**
4761	<	* Forces root task to complete.
5351	<	* @param ex if null, complete normally, else exceptionally
5352	<	* @return false to simplify use
4761	>	* Same as Traverser version
4762		*/
4763	<	final boolean tryCompleteComputation(Throwable ex) {
4764	<	for (BulkTask<K,V,?> a = this;;) {
4765	<	BulkTask<K,V,?> p = a.parent;
4766	<	if (p == null) {
4767	<	if (ex != null)
4768	<	a.completeExceptionally(ex);
4763	>	final Node<K,V> advance() {
4764	>	Node<K,V> e;
4765	>	if ((e = next) != null)
4766	>	e = e.next;
4767	>	for (;;) {
4768	>	Node<K,V>[] t; int i, n;
4769	>	if (e != null)
4770	>	return next = e;
4771	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4772	>	(n = t.length) <= (i = index) || i < 0)
4773	>	return next = null;
4774	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
4775	>	if (e instanceof ForwardingNode) {
4776	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4777	>	e = null;
4778	>	pushState(t, i, n);
4779	>	continue;
4780	>	}
4781	>	else if (e instanceof TreeBin)
4782	>	e = ((TreeBin<K,V>)e).first;
4783		else
4784	<	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;
4784	>	e = null;
4785		}
4786	+	if (stack != null)
4787	+	recoverState(n);
4788	+	else if ((index = i + baseSize) >= n)
4789	+	index = ++baseIndex;
4790		}
5403	–	return b;
5404	–	}
5405	–
5406	–	/**
5407	–	* Returns exportable snapshot entry.
5408	–	*/
5409	–	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
5410	–	return new AbstractMap.SimpleEntry<K,V>(k, v);
5411	–	}
5412	–
5413	–	// Unsafe mechanics
5414	–	private static final sun.misc.Unsafe U;
5415	–	private static final long PENDING;
5416	–	static {
5417	–	try {
5418	–	U = sun.misc.Unsafe.getUnsafe();
5419	–	PENDING = U.objectFieldOffset
5420	–	(BulkTask.class.getDeclaredField("pending"));
5421	–	} catch (Exception e) {
5422	–	throw new Error(e);
5423	–	}
5424	–	}
5425	–	}
5426	–
5427	–	/**
5428	–	* Base class for non-reductive actions
5429	–	*/
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;
4791		}
4792
4793	<	/**
4794	<	* Try to complete task and upward parents. Upon hitting
4795	<	* non-completed parent, if a non-FJ task, try to help out the
4796	<	* computation.
4797	<	*/
4798	<	final void tryComplete(BulkAction<K,V,?> subtasks) {
4799	<	BulkTask<K,V,?> a = this, s = a;
4800	<	for (int c;;) {
4801	<	if ((c = a.pending) == 0) {
4802	<	if ((a = (s = a).parent) == null) {
4803	<	s.quietlyComplete();
4804	<	break;
4805	<	}
4806	<	}
4807	<	else if (a.casPending(c, c - 1)) {
4808	<	if (subtasks != null && !inForkJoinPool()) {
4809	<	while ((s = a.parent) != null)
4810	<	a = s;
4811	<	while (!a.isDone()) {
4812	<	BulkAction<K,V,?> next = subtasks.nextTask;
4813	<	if (subtasks.tryUnfork())
4814	<	subtasks.exec();
4815	<	if ((subtasks = next) == null)
4816	<	break;
5462	<	}
5463	<	}
5464	<	break;
5465	<	}
4793	>	private void pushState(Node<K,V>[] t, int i, int n) {
4794	>	TableStack<K,V> s = spare;
4795	>	if (s != null)
4796	>	spare = s.next;
4797	>	else
4798	>	s = new TableStack<K,V>();
4799	>	s.tab = t;
4800	>	s.length = n;
4801	>	s.index = i;
4802	>	s.next = stack;
4803	>	stack = s;
4804	>	}
4805	>
4806	>	private void recoverState(int n) {
4807	>	TableStack<K,V> s; int len;
4808	>	while ((s = stack) != null && (index += (len = s.length)) >= n) {
4809	>	n = len;
4810	>	index = s.index;
4811	>	tab = s.tab;
4812	>	s.tab = null;
4813	>	TableStack<K,V> next = s.next;
4814	>	s.next = spare; // save for reuse
4815	>	stack = next;
4816	>	spare = s;
4817		}
4818	+	if (s == null && (index += baseSize) >= n)
4819	+	index = ++baseIndex;
4820		}
5468	–
4821		}
4822
4823		/*
4824		* Task classes. Coded in a regular but ugly format/style to
4825		* simplify checks that each variant differs in the right way from
4826	<	* others.
4827	<	*/
4828	<
4829	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4830	<	extends BulkAction<K,V,Void> {
4831	<	final Action<K> action;
4826	>	* others. The null screenings exist because compilers cannot tell
4827	>	* that we've already null-checked task arguments, so we force
4828	>	* simplest hoisted bypass to help avoid convoluted traps.
4829	>	*/
4830	>	@SuppressWarnings("serial")
4831	>	static final class ForEachKeyTask<K,V>
4832	>	extends BulkTask<K,V,Void> {
4833	>	final Consumer<? super K> action;
4834		ForEachKeyTask
4835	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4836	<	ForEachKeyTask<K,V> nextTask,
4837	<	Action<K> action) {
5484	<	super(m, p, b, nextTask);
4835	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4836	>	Consumer<? super K> action) {
4837	>	super(p, b, i, f, t);
4838		this.action = action;
4839		}
4840	<	@SuppressWarnings("unchecked") public final boolean exec() {
4841	<	final Action<K> action = this.action;
4842	<	if (action == null)
4843	<	return abortOnNullFunction();
4844	<	ForEachKeyTask<K,V> subtasks = null;
4845	<	try {
4846	<	int b = batch(), c;
4847	<	while (b > 1 && baseIndex != baseLimit) {
4848	<	do {} while (!casPending(c = pending, c+1));
4849	<	(subtasks = new ForEachKeyTask<K,V>
4850	<	(map, this, b >>>= 1, subtasks, action)).fork();
4851	<	}
4852	<	while (advance() != null)
5500	<	action.apply((K)nextKey);
5501	<	} catch (Throwable ex) {
5502	<	return tryCompleteComputation(ex);
4840	>	public final void compute() {
4841	>	final Consumer<? super K> action;
4842	>	if ((action = this.action) != null) {
4843	>	for (int i = baseIndex, f, h; batch > 0 &&
4844	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4845	>	addToPendingCount(1);
4846	>	new ForEachKeyTask<K,V>
4847	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4848	>	action).fork();
4849	>	}
4850	>	for (Node<K,V> p; (p = advance()) != null;)
4851	>	action.accept(p.key);
4852	>	propagateCompletion();
4853		}
5504	–	tryComplete(subtasks);
5505	–	return false;
4854		}
4855		}
4856
4857	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4858	<	extends BulkAction<K,V,Void> {
4859	<	final Action<V> action;
4857	>	@SuppressWarnings("serial")
4858	>	static final class ForEachValueTask<K,V>
4859	>	extends BulkTask<K,V,Void> {
4860	>	final Consumer<? super V> action;
4861		ForEachValueTask
4862	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4863	<	ForEachValueTask<K,V> nextTask,
4864	<	Action<V> action) {
5516	<	super(m, p, b, nextTask);
4862	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4863	>	Consumer<? super V> action) {
4864	>	super(p, b, i, f, t);
4865		this.action = action;
4866		}
4867	<	@SuppressWarnings("unchecked") public final boolean exec() {
4868	<	final Action<V> action = this.action;
4869	<	if (action == null)
4870	<	return abortOnNullFunction();
4871	<	ForEachValueTask<K,V> subtasks = null;
4872	<	try {
4873	<	int b = batch(), c;
4874	<	while (b > 1 && baseIndex != baseLimit) {
4875	<	do {} while (!casPending(c = pending, c+1));
4876	<	(subtasks = new ForEachValueTask<K,V>
4877	<	(map, this, b >>>= 1, subtasks, action)).fork();
4878	<	}
4879	<	Object v;
5532	<	while ((v = advance()) != null)
5533	<	action.apply((V)v);
5534	<	} catch (Throwable ex) {
5535	<	return tryCompleteComputation(ex);
4867	>	public final void compute() {
4868	>	final Consumer<? super V> action;
4869	>	if ((action = this.action) != null) {
4870	>	for (int i = baseIndex, f, h; batch > 0 &&
4871	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4872	>	addToPendingCount(1);
4873	>	new ForEachValueTask<K,V>
4874	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4875	>	action).fork();
4876	>	}
4877	>	for (Node<K,V> p; (p = advance()) != null;)
4878	>	action.accept(p.val);
4879	>	propagateCompletion();
4880		}
5537	–	tryComplete(subtasks);
5538	–	return false;
4881		}
4882		}
4883
4884	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4885	<	extends BulkAction<K,V,Void> {
4886	<	final Action<Entry<K,V>> action;
4884	>	@SuppressWarnings("serial")
4885	>	static final class ForEachEntryTask<K,V>
4886	>	extends BulkTask<K,V,Void> {
4887	>	final Consumer<? super Entry<K,V>> action;
4888		ForEachEntryTask
4889	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4890	<	ForEachEntryTask<K,V> nextTask,
4891	<	Action<Entry<K,V>> action) {
5549	<	super(m, p, b, nextTask);
4889	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4890	>	Consumer<? super Entry<K,V>> action) {
4891	>	super(p, b, i, f, t);
4892		this.action = action;
4893		}
4894	<	@SuppressWarnings("unchecked") public final boolean exec() {
4895	<	final Action<Entry<K,V>> action = this.action;
4896	<	if (action == null)
4897	<	return abortOnNullFunction();
4898	<	ForEachEntryTask<K,V> subtasks = null;
4899	<	try {
4900	<	int b = batch(), c;
4901	<	while (b > 1 && baseIndex != baseLimit) {
4902	<	do {} while (!casPending(c = pending, c+1));
4903	<	(subtasks = new ForEachEntryTask<K,V>
4904	<	(map, this, b >>>= 1, subtasks, action)).fork();
4905	<	}
4906	<	Object v;
5565	<	while ((v = advance()) != null)
5566	<	action.apply(entryFor((K)nextKey, (V)v));
5567	<	} catch (Throwable ex) {
5568	<	return tryCompleteComputation(ex);
4894	>	public final void compute() {
4895	>	final Consumer<? super Entry<K,V>> action;
4896	>	if ((action = this.action) != null) {
4897	>	for (int i = baseIndex, f, h; batch > 0 &&
4898	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4899	>	addToPendingCount(1);
4900	>	new ForEachEntryTask<K,V>
4901	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4902	>	action).fork();
4903	>	}
4904	>	for (Node<K,V> p; (p = advance()) != null; )
4905	>	action.accept(p);
4906	>	propagateCompletion();
4907		}
5570	–	tryComplete(subtasks);
5571	–	return false;
4908		}
4909		}
4910
4911	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4912	<	extends BulkAction<K,V,Void> {
4913	<	final BiAction<K,V> action;
4911	>	@SuppressWarnings("serial")
4912	>	static final class ForEachMappingTask<K,V>
4913	>	extends BulkTask<K,V,Void> {
4914	>	final BiConsumer<? super K, ? super V> action;
4915		ForEachMappingTask
4916	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4917	<	ForEachMappingTask<K,V> nextTask,
4918	<	BiAction<K,V> action) {
5582	<	super(m, p, b, nextTask);
4916	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4917	>	BiConsumer<? super K,? super V> action) {
4918	>	super(p, b, i, f, t);
4919		this.action = action;
4920		}
4921	<	@SuppressWarnings("unchecked") public final boolean exec() {
4922	<	final BiAction<K,V> action = this.action;
4923	<	if (action == null)
4924	<	return abortOnNullFunction();
4925	<	ForEachMappingTask<K,V> subtasks = null;
4926	<	try {
4927	<	int b = batch(), c;
4928	<	while (b > 1 && baseIndex != baseLimit) {
4929	<	do {} while (!casPending(c = pending, c+1));
4930	<	(subtasks = new ForEachMappingTask<K,V>
4931	<	(map, this, b >>>= 1, subtasks, action)).fork();
4932	<	}
4933	<	Object v;
5598	<	while ((v = advance()) != null)
5599	<	action.apply((K)nextKey, (V)v);
5600	<	} catch (Throwable ex) {
5601	<	return tryCompleteComputation(ex);
4921	>	public final void compute() {
4922	>	final BiConsumer<? super K, ? super V> action;
4923	>	if ((action = this.action) != null) {
4924	>	for (int i = baseIndex, f, h; batch > 0 &&
4925	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4926	>	addToPendingCount(1);
4927	>	new ForEachMappingTask<K,V>
4928	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4929	>	action).fork();
4930	>	}
4931	>	for (Node<K,V> p; (p = advance()) != null; )
4932	>	action.accept(p.key, p.val);
4933	>	propagateCompletion();
4934		}
5603	–	tryComplete(subtasks);
5604	–	return false;
4935		}
4936		}
4937
4938	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4939	<	extends BulkAction<K,V,Void> {
4940	<	final Fun<? super K, ? extends U> transformer;
4941	<	final Action<U> action;
4938	>	@SuppressWarnings("serial")
4939	>	static final class ForEachTransformedKeyTask<K,V,U>
4940	>	extends BulkTask<K,V,Void> {
4941	>	final Function<? super K, ? extends U> transformer;
4942	>	final Consumer<? super U> action;
4943		ForEachTransformedKeyTask
4944	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4945	<	ForEachTransformedKeyTask<K,V,U> nextTask,
4946	<	Fun<? super K, ? extends U> transformer,
4947	<	Action<U> action) {
4948	<	super(m, p, b, nextTask);
4949	<	this.transformer = transformer;
4950	<	this.action = action;
4951	<
4952	<	}
4953	<	@SuppressWarnings("unchecked") public final boolean exec() {
4954	<	final Fun<? super K, ? extends U> transformer =
4955	<	this.transformer;
4956	<	final Action<U> action = this.action;
4957	<	if (transformer == null || action == null)
4958	<	return abortOnNullFunction();
4959	<	ForEachTransformedKeyTask<K,V,U> subtasks = null;
4960	<	try {
4961	<	int b = batch(), c;
4962	<	while (b > 1 && baseIndex != baseLimit) {
4963	<	do {} while (!casPending(c = pending, c+1));
4964	<	(subtasks = new ForEachTransformedKeyTask<K,V,U>
4965	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
4966	<	}
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);
4944	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4945	>	Function<? super K, ? extends U> transformer, Consumer<? super U> action) {
4946	>	super(p, b, i, f, t);
4947	>	this.transformer = transformer; this.action = action;
4948	>	}
4949	>	public final void compute() {
4950	>	final Function<? super K, ? extends U> transformer;
4951	>	final Consumer<? super U> action;
4952	>	if ((transformer = this.transformer) != null &&
4953	>	(action = this.action) != null) {
4954	>	for (int i = baseIndex, f, h; batch > 0 &&
4955	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4956	>	addToPendingCount(1);
4957	>	new ForEachTransformedKeyTask<K,V,U>
4958	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4959	>	transformer, action).fork();
4960	>	}
4961	>	for (Node<K,V> p; (p = advance()) != null; ) {
4962	>	U u;
4963	>	if ((u = transformer.apply(p.key)) != null)
4964	>	action.accept(u);
4965	>	}
4966	>	propagateCompletion();
4967		}
5644	–	tryComplete(subtasks);
5645	–	return false;
4968		}
4969		}
4970
4971	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4972	<	extends BulkAction<K,V,Void> {
4973	<	final Fun<? super V, ? extends U> transformer;
4974	<	final Action<U> action;
4971	>	@SuppressWarnings("serial")
4972	>	static final class ForEachTransformedValueTask<K,V,U>
4973	>	extends BulkTask<K,V,Void> {
4974	>	final Function<? super V, ? extends U> transformer;
4975	>	final Consumer<? super U> action;
4976		ForEachTransformedValueTask
4977	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4978	<	ForEachTransformedValueTask<K,V,U> nextTask,
4979	<	Fun<? super V, ? extends U> transformer,
4980	<	Action<U> action) {
4981	<	super(m, p, b, nextTask);
4982	<	this.transformer = transformer;
4983	<	this.action = action;
4984	<
4985	<	}
4986	<	@SuppressWarnings("unchecked") public final boolean exec() {
4987	<	final Fun<? super V, ? extends U> transformer =
4988	<	this.transformer;
4989	<	final Action<U> action = this.action;
4990	<	if (transformer == null || action == null)
4991	<	return abortOnNullFunction();
4992	<	ForEachTransformedValueTask<K,V,U> subtasks = null;
4993	<	try {
4994	<	int b = batch(), c;
4995	<	while (b > 1 && baseIndex != baseLimit) {
4996	<	do {} while (!casPending(c = pending, c+1));
4997	<	(subtasks = new ForEachTransformedValueTask<K,V,U>
4998	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
4999	<	}
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);
4977	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4978	>	Function<? super V, ? extends U> transformer, Consumer<? super U> action) {
4979	>	super(p, b, i, f, t);
4980	>	this.transformer = transformer; this.action = action;
4981	>	}
4982	>	public final void compute() {
4983	>	final Function<? super V, ? extends U> transformer;
4984	>	final Consumer<? super U> action;
4985	>	if ((transformer = this.transformer) != null &&
4986	>	(action = this.action) != null) {
4987	>	for (int i = baseIndex, f, h; batch > 0 &&
4988	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4989	>	addToPendingCount(1);
4990	>	new ForEachTransformedValueTask<K,V,U>
4991	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4992	>	transformer, action).fork();
4993	>	}
4994	>	for (Node<K,V> p; (p = advance()) != null; ) {
4995	>	U u;
4996	>	if ((u = transformer.apply(p.val)) != null)
4997	>	action.accept(u);
4998	>	}
4999	>	propagateCompletion();
5000		}
5685	–	tryComplete(subtasks);
5686	–	return false;
5001		}
5002		}
5003
5004	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
5005	<	extends BulkAction<K,V,Void> {
5006	<	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5007	<	final Action<U> action;
5004	>	@SuppressWarnings("serial")
5005	>	static final class ForEachTransformedEntryTask<K,V,U>
5006	>	extends BulkTask<K,V,Void> {
5007	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
5008	>	final Consumer<? super U> action;
5009		ForEachTransformedEntryTask
5010	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5011	<	ForEachTransformedEntryTask<K,V,U> nextTask,
5012	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5013	<	Action<U> action) {
5014	<	super(m, p, b, nextTask);
5015	<	this.transformer = transformer;
5016	<	this.action = action;
5017	<
5018	<	}
5019	<	@SuppressWarnings("unchecked") public final boolean exec() {
5020	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5021	<	this.transformer;
5022	<	final Action<U> action = this.action;
5023	<	if (transformer == null || action == null)
5024	<	return abortOnNullFunction();
5025	<	ForEachTransformedEntryTask<K,V,U> subtasks = null;
5026	<	try {
5027	<	int b = batch(), c;
5028	<	while (b > 1 && baseIndex != baseLimit) {
5029	<	do {} while (!casPending(c = pending, c+1));
5030	<	(subtasks = new ForEachTransformedEntryTask<K,V,U>
5031	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5032	<	}
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);
5010	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5011	>	Function<Map.Entry<K,V>, ? extends U> transformer, Consumer<? super U> action) {
5012	>	super(p, b, i, f, t);
5013	>	this.transformer = transformer; this.action = action;
5014	>	}
5015	>	public final void compute() {
5016	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
5017	>	final Consumer<? super U> action;
5018	>	if ((transformer = this.transformer) != null &&
5019	>	(action = this.action) != null) {
5020	>	for (int i = baseIndex, f, h; batch > 0 &&
5021	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5022	>	addToPendingCount(1);
5023	>	new ForEachTransformedEntryTask<K,V,U>
5024	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5025	>	transformer, action).fork();
5026	>	}
5027	>	for (Node<K,V> p; (p = advance()) != null; ) {
5028	>	U u;
5029	>	if ((u = transformer.apply(p)) != null)
5030	>	action.accept(u);
5031	>	}
5032	>	propagateCompletion();
5033		}
5726	–	tryComplete(subtasks);
5727	–	return false;
5034		}
5035		}
5036
5037	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
5038	<	extends BulkAction<K,V,Void> {
5039	<	final BiFun<? super K, ? super V, ? extends U> transformer;
5040	<	final Action<U> action;
5037	>	@SuppressWarnings("serial")
5038	>	static final class ForEachTransformedMappingTask<K,V,U>
5039	>	extends BulkTask<K,V,Void> {
5040	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
5041	>	final Consumer<? super U> action;
5042		ForEachTransformedMappingTask
5043	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5044	<	ForEachTransformedMappingTask<K,V,U> nextTask,
5045	<	BiFun<? super K, ? super V, ? extends U> transformer,
5046	<	Action<U> action) {
5047	<	super(m, p, b, nextTask);
5048	<	this.transformer = transformer;
5049	<	this.action = action;
5050	<
5051	<	}
5052	<	@SuppressWarnings("unchecked") public final boolean exec() {
5053	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5054	<	this.transformer;
5055	<	final Action<U> action = this.action;
5056	<	if (transformer == null || action == null)
5057	<	return abortOnNullFunction();
5058	<	ForEachTransformedMappingTask<K,V,U> subtasks = null;
5059	<	try {
5060	<	int b = batch(), c;
5061	<	while (b > 1 && baseIndex != baseLimit) {
5062	<	do {} while (!casPending(c = pending, c+1));
5063	<	(subtasks = new ForEachTransformedMappingTask<K,V,U>
5064	<	(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);
5043	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5044	>	BiFunction<? super K, ? super V, ? extends U> transformer,
5045	>	Consumer<? super U> action) {
5046	>	super(p, b, i, f, t);
5047	>	this.transformer = transformer; this.action = action;
5048	>	}
5049	>	public final void compute() {
5050	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
5051	>	final Consumer<? super U> action;
5052	>	if ((transformer = this.transformer) != null &&
5053	>	(action = this.action) != null) {
5054	>	for (int i = baseIndex, f, h; batch > 0 &&
5055	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5056	>	addToPendingCount(1);
5057	>	new ForEachTransformedMappingTask<K,V,U>
5058	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5059	>	transformer, action).fork();
5060	>	}
5061	>	for (Node<K,V> p; (p = advance()) != null; ) {
5062	>	U u;
5063	>	if ((u = transformer.apply(p.key, p.val)) != null)
5064	>	action.accept(u);
5065		}
5066	<	} catch (Throwable ex) {
5765	<	return tryCompleteComputation(ex);
5066	>	propagateCompletion();
5067		}
5767	–	tryComplete(subtasks);
5768	–	return false;
5068		}
5069		}
5070
5071	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
5072	<	extends BulkAction<K,V,U> {
5073	<	final Fun<? super K, ? extends U> searchFunction;
5071	>	@SuppressWarnings("serial")
5072	>	static final class SearchKeysTask<K,V,U>
5073	>	extends BulkTask<K,V,U> {
5074	>	final Function<? super K, ? extends U> searchFunction;
5075		final AtomicReference<U> result;
5076		SearchKeysTask
5077	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5078	<	SearchKeysTask<K,V,U> nextTask,
5779	<	Fun<? super K, ? extends U> searchFunction,
5077	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5078	>	Function<? super K, ? extends U> searchFunction,
5079		AtomicReference<U> result) {
5080	<	super(m, p, b, nextTask);
5080	>	super(p, b, i, f, t);
5081		this.searchFunction = searchFunction; this.result = result;
5082		}
5083	<	@SuppressWarnings("unchecked") public final boolean exec() {
5084	<	AtomicReference<U> result = this.result;
5085	<	final Fun<? super K, ? extends U> searchFunction =
5086	<	this.searchFunction;
5087	<	if (searchFunction == null || result == null)
5088	<	return abortOnNullFunction();
5089	<	SearchKeysTask<K,V,U> subtasks = null;
5090	<	try {
5091	<	int b = batch(), c;
5092	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5093	<	do {} while (!casPending(c = pending, c+1));
5094	<	(subtasks = new SearchKeysTask<K,V,U>
5095	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5096	<	}
5097	<	U u;
5098	<	while (result.get() == null && advance() != null) {
5099	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
5083	>	public final U getRawResult() { return result.get(); }
5084	>	public final void compute() {
5085	>	final Function<? super K, ? extends U> searchFunction;
5086	>	final AtomicReference<U> result;
5087	>	if ((searchFunction = this.searchFunction) != null &&
5088	>	(result = this.result) != null) {
5089	>	for (int i = baseIndex, f, h; batch > 0 &&
5090	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5091	>	if (result.get() != null)
5092	>	return;
5093	>	addToPendingCount(1);
5094	>	new SearchKeysTask<K,V,U>
5095	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5096	>	searchFunction, result).fork();
5097	>	}
5098	>	while (result.get() == null) {
5099	>	U u;
5100	>	Node<K,V> p;
5101	>	if ((p = advance()) == null) {
5102	>	propagateCompletion();
5103	>	break;
5104	>	}
5105	>	if ((u = searchFunction.apply(p.key)) != null) {
5106		if (result.compareAndSet(null, u))
5107	<	tryCompleteComputation(null);
5107	>	quietlyCompleteRoot();
5108		break;
5109		}
5110		}
5806	–	} catch (Throwable ex) {
5807	–	return tryCompleteComputation(ex);
5111		}
5809	–	tryComplete(subtasks);
5810	–	return false;
5112		}
5812	–	public final U getRawResult() { return result.get(); }
5113		}
5114
5115	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
5116	<	extends BulkAction<K,V,U> {
5117	<	final Fun<? super V, ? extends U> searchFunction;
5115	>	@SuppressWarnings("serial")
5116	>	static final class SearchValuesTask<K,V,U>
5117	>	extends BulkTask<K,V,U> {
5118	>	final Function<? super V, ? extends U> searchFunction;
5119		final AtomicReference<U> result;
5120		SearchValuesTask
5121	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5122	<	SearchValuesTask<K,V,U> nextTask,
5822	<	Fun<? super V, ? extends U> searchFunction,
5121	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5122	>	Function<? super V, ? extends U> searchFunction,
5123		AtomicReference<U> result) {
5124	<	super(m, p, b, nextTask);
5124	>	super(p, b, i, f, t);
5125		this.searchFunction = searchFunction; this.result = result;
5126		}
5127	<	@SuppressWarnings("unchecked") public final boolean exec() {
5128	<	AtomicReference<U> result = this.result;
5129	<	final Fun<? super V, ? extends U> searchFunction =
5130	<	this.searchFunction;
5131	<	if (searchFunction == null || result == null)
5132	<	return abortOnNullFunction();
5133	<	SearchValuesTask<K,V,U> subtasks = null;
5134	<	try {
5135	<	int b = batch(), c;
5136	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5137	<	do {} while (!casPending(c = pending, c+1));
5138	<	(subtasks = new SearchValuesTask<K,V,U>
5139	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5140	<	}
5141	<	Object v; U u;
5142	<	while (result.get() == null && (v = advance()) != null) {
5143	<	if ((u = searchFunction.apply((V)v)) != null) {
5127	>	public final U getRawResult() { return result.get(); }
5128	>	public final void compute() {
5129	>	final Function<? super V, ? extends U> searchFunction;
5130	>	final AtomicReference<U> result;
5131	>	if ((searchFunction = this.searchFunction) != null &&
5132	>	(result = this.result) != null) {
5133	>	for (int i = baseIndex, f, h; batch > 0 &&
5134	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5135	>	if (result.get() != null)
5136	>	return;
5137	>	addToPendingCount(1);
5138	>	new SearchValuesTask<K,V,U>
5139	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5140	>	searchFunction, result).fork();
5141	>	}
5142	>	while (result.get() == null) {
5143	>	U u;
5144	>	Node<K,V> p;
5145	>	if ((p = advance()) == null) {
5146	>	propagateCompletion();
5147	>	break;
5148	>	}
5149	>	if ((u = searchFunction.apply(p.val)) != null) {
5150		if (result.compareAndSet(null, u))
5151	<	tryCompleteComputation(null);
5151	>	quietlyCompleteRoot();
5152		break;
5153		}
5154		}
5849	–	} catch (Throwable ex) {
5850	–	return tryCompleteComputation(ex);
5155		}
5852	–	tryComplete(subtasks);
5853	–	return false;
5156		}
5855	–	public final U getRawResult() { return result.get(); }
5157		}
5158
5159	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5160	<	extends BulkAction<K,V,U> {
5161	<	final Fun<Entry<K,V>, ? extends U> searchFunction;
5159	>	@SuppressWarnings("serial")
5160	>	static final class SearchEntriesTask<K,V,U>
5161	>	extends BulkTask<K,V,U> {
5162	>	final Function<Entry<K,V>, ? extends U> searchFunction;
5163		final AtomicReference<U> result;
5164		SearchEntriesTask
5165	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5166	<	SearchEntriesTask<K,V,U> nextTask,
5865	<	Fun<Entry<K,V>, ? extends U> searchFunction,
5165	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5166	>	Function<Entry<K,V>, ? extends U> searchFunction,
5167		AtomicReference<U> result) {
5168	<	super(m, p, b, nextTask);
5168	>	super(p, b, i, f, t);
5169		this.searchFunction = searchFunction; this.result = result;
5170		}
5171	<	@SuppressWarnings("unchecked") public final boolean exec() {
5172	<	AtomicReference<U> result = this.result;
5173	<	final Fun<Entry<K,V>, ? extends U> searchFunction =
5174	<	this.searchFunction;
5175	<	if (searchFunction == null || result == null)
5176	<	return abortOnNullFunction();
5177	<	SearchEntriesTask<K,V,U> subtasks = null;
5178	<	try {
5179	<	int b = batch(), c;
5180	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5181	<	do {} while (!casPending(c = pending, c+1));
5182	<	(subtasks = new SearchEntriesTask<K,V,U>
5183	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5184	<	}
5185	<	Object v; U u;
5186	<	while (result.get() == null && (v = advance()) != null) {
5187	<	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
5188	<	if (result.compareAndSet(null, u))
5189	<	tryCompleteComputation(null);
5171	>	public final U getRawResult() { return result.get(); }
5172	>	public final void compute() {
5173	>	final Function<Entry<K,V>, ? extends U> searchFunction;
5174	>	final AtomicReference<U> result;
5175	>	if ((searchFunction = this.searchFunction) != null &&
5176	>	(result = this.result) != null) {
5177	>	for (int i = baseIndex, f, h; batch > 0 &&
5178	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5179	>	if (result.get() != null)
5180	>	return;
5181	>	addToPendingCount(1);
5182	>	new SearchEntriesTask<K,V,U>
5183	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5184	>	searchFunction, result).fork();
5185	>	}
5186	>	while (result.get() == null) {
5187	>	U u;
5188	>	Node<K,V> p;
5189	>	if ((p = advance()) == null) {
5190	>	propagateCompletion();
5191		break;
5192		}
5193	+	if ((u = searchFunction.apply(p)) != null) {
5194	+	if (result.compareAndSet(null, u))
5195	+	quietlyCompleteRoot();
5196	+	return;
5197	+	}
5198		}
5892	–	} catch (Throwable ex) {
5893	–	return tryCompleteComputation(ex);
5199		}
5895	–	tryComplete(subtasks);
5896	–	return false;
5200		}
5898	–	public final U getRawResult() { return result.get(); }
5201		}
5202
5203	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5204	<	extends BulkAction<K,V,U> {
5205	<	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5203	>	@SuppressWarnings("serial")
5204	>	static final class SearchMappingsTask<K,V,U>
5205	>	extends BulkTask<K,V,U> {
5206	>	final BiFunction<? super K, ? super V, ? extends U> searchFunction;
5207		final AtomicReference<U> result;
5208		SearchMappingsTask
5209	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5210	<	SearchMappingsTask<K,V,U> nextTask,
5908	<	BiFun<? super K, ? super V, ? extends U> searchFunction,
5209	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5210	>	BiFunction<? super K, ? super V, ? extends U> searchFunction,
5211		AtomicReference<U> result) {
5212	<	super(m, p, b, nextTask);
5212	>	super(p, b, i, f, t);
5213		this.searchFunction = searchFunction; this.result = result;
5214		}
5215	<	@SuppressWarnings("unchecked") public final boolean exec() {
5216	<	AtomicReference<U> result = this.result;
5217	<	final BiFun<? super K, ? super V, ? extends U> searchFunction =
5218	<	this.searchFunction;
5219	<	if (searchFunction == null || result == null)
5220	<	return abortOnNullFunction();
5221	<	SearchMappingsTask<K,V,U> subtasks = null;
5222	<	try {
5223	<	int b = batch(), c;
5224	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5225	<	do {} while (!casPending(c = pending, c+1));
5226	<	(subtasks = new SearchMappingsTask<K,V,U>
5227	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5228	<	}
5229	<	Object v; U u;
5230	<	while (result.get() == null && (v = advance()) != null) {
5231	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5215	>	public final U getRawResult() { return result.get(); }
5216	>	public final void compute() {
5217	>	final BiFunction<? super K, ? super V, ? extends U> searchFunction;
5218	>	final AtomicReference<U> result;
5219	>	if ((searchFunction = this.searchFunction) != null &&
5220	>	(result = this.result) != null) {
5221	>	for (int i = baseIndex, f, h; batch > 0 &&
5222	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5223	>	if (result.get() != null)
5224	>	return;
5225	>	addToPendingCount(1);
5226	>	new SearchMappingsTask<K,V,U>
5227	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5228	>	searchFunction, result).fork();
5229	>	}
5230	>	while (result.get() == null) {
5231	>	U u;
5232	>	Node<K,V> p;
5233	>	if ((p = advance()) == null) {
5234	>	propagateCompletion();
5235	>	break;
5236	>	}
5237	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5238		if (result.compareAndSet(null, u))
5239	<	tryCompleteComputation(null);
5239	>	quietlyCompleteRoot();
5240		break;
5241		}
5242		}
5935	–	} catch (Throwable ex) {
5936	–	return tryCompleteComputation(ex);
5243		}
5938	–	tryComplete(subtasks);
5939	–	return false;
5244		}
5941	–	public final U getRawResult() { return result.get(); }
5245		}
5246
5247	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5247	>	@SuppressWarnings("serial")
5248	>	static final class ReduceKeysTask<K,V>
5249		extends BulkTask<K,V,K> {
5250	<	final BiFun<? super K, ? super K, ? extends K> reducer;
5250	>	final BiFunction<? super K, ? super K, ? extends K> reducer;
5251		K result;
5252		ReduceKeysTask<K,V> rights, nextRight;
5253		ReduceKeysTask
5254	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5254	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5255		ReduceKeysTask<K,V> nextRight,
5256	<	BiFun<? super K, ? super K, ? extends K> reducer) {
5257	<	super(m, p, b); this.nextRight = nextRight;
5256	>	BiFunction<? super K, ? super K, ? extends K> reducer) {
5257	>	super(p, b, i, f, t); this.nextRight = nextRight;
5258		this.reducer = reducer;
5259		}
5260	<	@SuppressWarnings("unchecked") public final boolean exec() {
5261	<	final BiFun<? super K, ? super K, ? extends K> reducer =
5262	<	this.reducer;
5263	<	if (reducer == null)
5264	<	return abortOnNullFunction();
5265	<	try {
5266	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5963	<	do {} while (!casPending(c = pending, c+1));
5260	>	public final K getRawResult() { return result; }
5261	>	public final void compute() {
5262	>	final BiFunction<? super K, ? super K, ? extends K> reducer;
5263	>	if ((reducer = this.reducer) != null) {
5264	>	for (int i = baseIndex, f, h; batch > 0 &&
5265	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5266	>	addToPendingCount(1);
5267		(rights = new ReduceKeysTask<K,V>
5268	<	(map, this, b >>>= 1, rights, reducer)).fork();
5268	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5269	>	rights, reducer)).fork();
5270		}
5271		K r = null;
5272	<	while (advance() != null) {
5273	<	K u = (K)nextKey;
5274	<	r = (r == null) ? u : reducer.apply(r, u);
5272	>	for (Node<K,V> p; (p = advance()) != null; ) {
5273	>	K u = p.key;
5274	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5275		}
5276		result = r;
5277	<	for (ReduceKeysTask<K,V> t = this, s;;) {
5278	<	int c; BulkTask<K,V,?> par; K tr, sr;
5279	<	if ((c = t.pending) == 0) {
5280	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5281	<	if ((sr = s.result) != null)
5282	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5283	<	}
5284	<	if ((par = t.parent) == null ||
5285	<	!(par instanceof ReduceKeysTask)) {
5286	<	t.quietlyComplete();
5287	<	break;
5288	<	}
5985	<	t = (ReduceKeysTask<K,V>)par;
5277	>	CountedCompleter<?> c;
5278	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5279	>	@SuppressWarnings("unchecked")
5280	>	ReduceKeysTask<K,V>
5281	>	t = (ReduceKeysTask<K,V>)c,
5282	>	s = t.rights;
5283	>	while (s != null) {
5284	>	K tr, sr;
5285	>	if ((sr = s.result) != null)
5286	>	t.result = (((tr = t.result) == null) ? sr :
5287	>	reducer.apply(tr, sr));
5288	>	s = t.rights = s.nextRight;
5289		}
5987	–	else if (t.casPending(c, c - 1))
5988	–	break;
5290		}
5990	–	} catch (Throwable ex) {
5991	–	return tryCompleteComputation(ex);
5291		}
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);
5999	–	}
6000	–	return false;
5292		}
6002	–	public final K getRawResult() { return result; }
5293		}
5294
5295	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5295	>	@SuppressWarnings("serial")
5296	>	static final class ReduceValuesTask<K,V>
5297		extends BulkTask<K,V,V> {
5298	<	final BiFun<? super V, ? super V, ? extends V> reducer;
5298	>	final BiFunction<? super V, ? super V, ? extends V> reducer;
5299		V result;
5300		ReduceValuesTask<K,V> rights, nextRight;
5301		ReduceValuesTask
5302	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5302	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5303		ReduceValuesTask<K,V> nextRight,
5304	<	BiFun<? super V, ? super V, ? extends V> reducer) {
5305	<	super(m, p, b); this.nextRight = nextRight;
5304	>	BiFunction<? super V, ? super V, ? extends V> reducer) {
5305	>	super(p, b, i, f, t); this.nextRight = nextRight;
5306		this.reducer = reducer;
5307		}
5308	<	@SuppressWarnings("unchecked") public final boolean exec() {
5309	<	final BiFun<? super V, ? super V, ? extends V> reducer =
5310	<	this.reducer;
5311	<	if (reducer == null)
5312	<	return abortOnNullFunction();
5313	<	try {
5314	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6024	<	do {} while (!casPending(c = pending, c+1));
5308	>	public final V getRawResult() { return result; }
5309	>	public final void compute() {
5310	>	final BiFunction<? super V, ? super V, ? extends V> reducer;
5311	>	if ((reducer = this.reducer) != null) {
5312	>	for (int i = baseIndex, f, h; batch > 0 &&
5313	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5314	>	addToPendingCount(1);
5315		(rights = new ReduceValuesTask<K,V>
5316	<	(map, this, b >>>= 1, rights, reducer)).fork();
5316	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5317	>	rights, reducer)).fork();
5318		}
5319		V r = null;
5320	<	Object v;
5321	<	while ((v = advance()) != null) {
5322	<	V u = (V)v;
6032	<	r = (r == null) ? u : reducer.apply(r, u);
5320	>	for (Node<K,V> p; (p = advance()) != null; ) {
5321	>	V v = p.val;
5322	>	r = (r == null) ? v : reducer.apply(r, v);
5323		}
5324		result = r;
5325	<	for (ReduceValuesTask<K,V> t = this, s;;) {
5326	<	int c; BulkTask<K,V,?> par; V tr, sr;
5327	<	if ((c = t.pending) == 0) {
5328	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5329	<	if ((sr = s.result) != null)
5330	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5331	<	}
5332	<	if ((par = t.parent) == null ||
5333	<	!(par instanceof ReduceValuesTask)) {
5334	<	t.quietlyComplete();
5335	<	break;
5336	<	}
6047	<	t = (ReduceValuesTask<K,V>)par;
5325	>	CountedCompleter<?> c;
5326	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5327	>	@SuppressWarnings("unchecked")
5328	>	ReduceValuesTask<K,V>
5329	>	t = (ReduceValuesTask<K,V>)c,
5330	>	s = t.rights;
5331	>	while (s != null) {
5332	>	V tr, sr;
5333	>	if ((sr = s.result) != null)
5334	>	t.result = (((tr = t.result) == null) ? sr :
5335	>	reducer.apply(tr, sr));
5336	>	s = t.rights = s.nextRight;
5337		}
6049	–	else if (t.casPending(c, c - 1))
6050	–	break;
5338		}
6052	–	} catch (Throwable ex) {
6053	–	return tryCompleteComputation(ex);
5339		}
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);
6061	–	}
6062	–	return false;
5340		}
6064	–	public final V getRawResult() { return result; }
5341		}
5342
5343	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5343	>	@SuppressWarnings("serial")
5344	>	static final class ReduceEntriesTask<K,V>
5345		extends BulkTask<K,V,Map.Entry<K,V>> {
5346	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5346	>	final BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5347		Map.Entry<K,V> result;
5348		ReduceEntriesTask<K,V> rights, nextRight;
5349		ReduceEntriesTask
5350	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5350	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5351		ReduceEntriesTask<K,V> nextRight,
5352	<	BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5353	<	super(m, p, b); this.nextRight = nextRight;
5352	>	BiFunction<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5353	>	super(p, b, i, f, t); this.nextRight = nextRight;
5354		this.reducer = reducer;
5355		}
5356	<	@SuppressWarnings("unchecked") public final boolean exec() {
5357	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5358	<	this.reducer;
5359	<	if (reducer == null)
5360	<	return abortOnNullFunction();
5361	<	try {
5362	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6086	<	do {} while (!casPending(c = pending, c+1));
5356	>	public final Map.Entry<K,V> getRawResult() { return result; }
5357	>	public final void compute() {
5358	>	final BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5359	>	if ((reducer = this.reducer) != null) {
5360	>	for (int i = baseIndex, f, h; batch > 0 &&
5361	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5362	>	addToPendingCount(1);
5363		(rights = new ReduceEntriesTask<K,V>
5364	<	(map, this, b >>>= 1, rights, reducer)).fork();
5364	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5365	>	rights, reducer)).fork();
5366		}
5367		Map.Entry<K,V> r = null;
5368	<	Object v;
5369	<	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	<	}
5368	>	for (Node<K,V> p; (p = advance()) != null; )
5369	>	r = (r == null) ? p : reducer.apply(r, p);
5370		result = r;
5371	<	for (ReduceEntriesTask<K,V> t = this, s;;) {
5372	<	int c; BulkTask<K,V,?> par; Map.Entry<K,V> tr, sr;
5373	<	if ((c = t.pending) == 0) {
5374	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5375	<	if ((sr = s.result) != null)
5376	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5377	<	}
5378	<	if ((par = t.parent) == null ||
5379	<	!(par instanceof ReduceEntriesTask)) {
5380	<	t.quietlyComplete();
5381	<	break;
5382	<	}
6109	<	t = (ReduceEntriesTask<K,V>)par;
5371	>	CountedCompleter<?> c;
5372	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5373	>	@SuppressWarnings("unchecked")
5374	>	ReduceEntriesTask<K,V>
5375	>	t = (ReduceEntriesTask<K,V>)c,
5376	>	s = t.rights;
5377	>	while (s != null) {
5378	>	Map.Entry<K,V> tr, sr;
5379	>	if ((sr = s.result) != null)
5380	>	t.result = (((tr = t.result) == null) ? sr :
5381	>	reducer.apply(tr, sr));
5382	>	s = t.rights = s.nextRight;
5383		}
6111	–	else if (t.casPending(c, c - 1))
6112	–	break;
5384		}
6114	–	} catch (Throwable ex) {
6115	–	return tryCompleteComputation(ex);
5385		}
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);
6123	–	}
6124	–	return false;
5386		}
6126	–	public final Map.Entry<K,V> getRawResult() { return result; }
5387		}
5388
5389	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5389	>	@SuppressWarnings("serial")
5390	>	static final class MapReduceKeysTask<K,V,U>
5391		extends BulkTask<K,V,U> {
5392	<	final Fun<? super K, ? extends U> transformer;
5393	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5392	>	final Function<? super K, ? extends U> transformer;
5393	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5394		U result;
5395		MapReduceKeysTask<K,V,U> rights, nextRight;
5396		MapReduceKeysTask
5397	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5397	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5398		MapReduceKeysTask<K,V,U> nextRight,
5399	<	Fun<? super K, ? extends U> transformer,
5400	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5401	<	super(m, p, b); this.nextRight = nextRight;
5399	>	Function<? super K, ? extends U> transformer,
5400	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5401	>	super(p, b, i, f, t); this.nextRight = nextRight;
5402		this.transformer = transformer;
5403		this.reducer = reducer;
5404		}
5405	<	@SuppressWarnings("unchecked") public final boolean exec() {
5406	<	final Fun<? super K, ? extends U> transformer =
5407	<	this.transformer;
5408	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5409	<	this.reducer;
5410	<	if (transformer == null || reducer == null)
5411	<	return abortOnNullFunction();
5412	<	try {
5413	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6153	<	do {} while (!casPending(c = pending, c+1));
5405	>	public final U getRawResult() { return result; }
5406	>	public final void compute() {
5407	>	final Function<? super K, ? extends U> transformer;
5408	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5409	>	if ((transformer = this.transformer) != null &&
5410	>	(reducer = this.reducer) != null) {
5411	>	for (int i = baseIndex, f, h; batch > 0 &&
5412	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5413	>	addToPendingCount(1);
5414		(rights = new MapReduceKeysTask<K,V,U>
5415	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5415	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5416	>	rights, transformer, reducer)).fork();
5417		}
5418	<	U r = null, u;
5419	<	while (advance() != null) {
5420	<	if ((u = transformer.apply((K)nextKey)) != null)
5418	>	U r = null;
5419	>	for (Node<K,V> p; (p = advance()) != null; ) {
5420	>	U u;
5421	>	if ((u = transformer.apply(p.key)) != null)
5422		r = (r == null) ? u : reducer.apply(r, u);
5423		}
5424		result = r;
5425	<	for (MapReduceKeysTask<K,V,U> t = this, s;;) {
5426	<	int c; BulkTask<K,V,?> par; U tr, sr;
5427	<	if ((c = t.pending) == 0) {
5428	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5429	<	if ((sr = s.result) != null)
5430	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5431	<	}
5432	<	if ((par = t.parent) == null ||
5433	<	!(par instanceof MapReduceKeysTask)) {
5434	<	t.quietlyComplete();
5435	<	break;
5436	<	}
6175	<	t = (MapReduceKeysTask<K,V,U>)par;
5425	>	CountedCompleter<?> c;
5426	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5427	>	@SuppressWarnings("unchecked")
5428	>	MapReduceKeysTask<K,V,U>
5429	>	t = (MapReduceKeysTask<K,V,U>)c,
5430	>	s = t.rights;
5431	>	while (s != null) {
5432	>	U tr, sr;
5433	>	if ((sr = s.result) != null)
5434	>	t.result = (((tr = t.result) == null) ? sr :
5435	>	reducer.apply(tr, sr));
5436	>	s = t.rights = s.nextRight;
5437		}
6177	–	else if (t.casPending(c, c - 1))
6178	–	break;
5438		}
6180	–	} catch (Throwable ex) {
6181	–	return tryCompleteComputation(ex);
5439		}
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;
5440		}
6192	–	public final U getRawResult() { return result; }
5441		}
5442
5443	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5443	>	@SuppressWarnings("serial")
5444	>	static final class MapReduceValuesTask<K,V,U>
5445		extends BulkTask<K,V,U> {
5446	<	final Fun<? super V, ? extends U> transformer;
5447	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5446	>	final Function<? super V, ? extends U> transformer;
5447	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5448		U result;
5449		MapReduceValuesTask<K,V,U> rights, nextRight;
5450		MapReduceValuesTask
5451	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5451	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5452		MapReduceValuesTask<K,V,U> nextRight,
5453	<	Fun<? super V, ? extends U> transformer,
5454	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5455	<	super(m, p, b); this.nextRight = nextRight;
5453	>	Function<? super V, ? extends U> transformer,
5454	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5455	>	super(p, b, i, f, t); this.nextRight = nextRight;
5456		this.transformer = transformer;
5457		this.reducer = reducer;
5458		}
5459	<	@SuppressWarnings("unchecked") public final boolean exec() {
5460	<	final Fun<? super V, ? extends U> transformer =
5461	<	this.transformer;
5462	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5463	<	this.reducer;
5464	<	if (transformer == null || reducer == null)
5465	<	return abortOnNullFunction();
5466	<	try {
5467	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6219	<	do {} while (!casPending(c = pending, c+1));
5459	>	public final U getRawResult() { return result; }
5460	>	public final void compute() {
5461	>	final Function<? super V, ? extends U> transformer;
5462	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5463	>	if ((transformer = this.transformer) != null &&
5464	>	(reducer = this.reducer) != null) {
5465	>	for (int i = baseIndex, f, h; batch > 0 &&
5466	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5467	>	addToPendingCount(1);
5468		(rights = new MapReduceValuesTask<K,V,U>
5469	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5469	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5470	>	rights, transformer, reducer)).fork();
5471		}
5472	<	U r = null, u;
5473	<	Object v;
5474	<	while ((v = advance()) != null) {
5475	<	if ((u = transformer.apply((V)v)) != null)
5472	>	U r = null;
5473	>	for (Node<K,V> p; (p = advance()) != null; ) {
5474	>	U u;
5475	>	if ((u = transformer.apply(p.val)) != null)
5476		r = (r == null) ? u : reducer.apply(r, u);
5477		}
5478		result = r;
5479	<	for (MapReduceValuesTask<K,V,U> t = this, s;;) {
5480	<	int c; BulkTask<K,V,?> par; U tr, sr;
5481	<	if ((c = t.pending) == 0) {
5482	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5483	<	if ((sr = s.result) != null)
5484	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5485	<	}
5486	<	if ((par = t.parent) == null ||
5487	<	!(par instanceof MapReduceValuesTask)) {
5488	<	t.quietlyComplete();
5489	<	break;
5490	<	}
6242	<	t = (MapReduceValuesTask<K,V,U>)par;
5479	>	CountedCompleter<?> c;
5480	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5481	>	@SuppressWarnings("unchecked")
5482	>	MapReduceValuesTask<K,V,U>
5483	>	t = (MapReduceValuesTask<K,V,U>)c,
5484	>	s = t.rights;
5485	>	while (s != null) {
5486	>	U tr, sr;
5487	>	if ((sr = s.result) != null)
5488	>	t.result = (((tr = t.result) == null) ? sr :
5489	>	reducer.apply(tr, sr));
5490	>	s = t.rights = s.nextRight;
5491		}
6244	–	else if (t.casPending(c, c - 1))
6245	–	break;
5492		}
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);
5493		}
6257	–	return false;
5494		}
6259	–	public final U getRawResult() { return result; }
5495		}
5496
5497	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5497	>	@SuppressWarnings("serial")
5498	>	static final class MapReduceEntriesTask<K,V,U>
5499		extends BulkTask<K,V,U> {
5500	<	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5501	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5500	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
5501	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5502		U result;
5503		MapReduceEntriesTask<K,V,U> rights, nextRight;
5504		MapReduceEntriesTask
5505	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5505	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5506		MapReduceEntriesTask<K,V,U> nextRight,
5507	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5508	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5509	<	super(m, p, b); this.nextRight = nextRight;
5507	>	Function<Map.Entry<K,V>, ? extends U> transformer,
5508	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5509	>	super(p, b, i, f, t); this.nextRight = nextRight;
5510		this.transformer = transformer;
5511		this.reducer = reducer;
5512		}
5513	<	@SuppressWarnings("unchecked") public final boolean exec() {
5514	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5515	<	this.transformer;
5516	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5517	<	this.reducer;
5518	<	if (transformer == null || reducer == null)
5519	<	return abortOnNullFunction();
5520	<	try {
5521	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6286	<	do {} while (!casPending(c = pending, c+1));
5513	>	public final U getRawResult() { return result; }
5514	>	public final void compute() {
5515	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
5516	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5517	>	if ((transformer = this.transformer) != null &&
5518	>	(reducer = this.reducer) != null) {
5519	>	for (int i = baseIndex, f, h; batch > 0 &&
5520	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5521	>	addToPendingCount(1);
5522		(rights = new MapReduceEntriesTask<K,V,U>
5523	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5523	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5524	>	rights, transformer, reducer)).fork();
5525		}
5526	<	U r = null, u;
5527	<	Object v;
5528	<	while ((v = advance()) != null) {
5529	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5526	>	U r = null;
5527	>	for (Node<K,V> p; (p = advance()) != null; ) {
5528	>	U u;
5529	>	if ((u = transformer.apply(p)) != null)
5530		r = (r == null) ? u : reducer.apply(r, u);
5531		}
5532		result = r;
5533	<	for (MapReduceEntriesTask<K,V,U> t = this, s;;) {
5534	<	int c; BulkTask<K,V,?> par; U tr, sr;
5535	<	if ((c = t.pending) == 0) {
5536	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5537	<	if ((sr = s.result) != null)
5538	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5539	<	}
5540	<	if ((par = t.parent) == null ||
5541	<	!(par instanceof MapReduceEntriesTask)) {
5542	<	t.quietlyComplete();
5543	<	break;
5544	<	}
6309	<	t = (MapReduceEntriesTask<K,V,U>)par;
5533	>	CountedCompleter<?> c;
5534	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5535	>	@SuppressWarnings("unchecked")
5536	>	MapReduceEntriesTask<K,V,U>
5537	>	t = (MapReduceEntriesTask<K,V,U>)c,
5538	>	s = t.rights;
5539	>	while (s != null) {
5540	>	U tr, sr;
5541	>	if ((sr = s.result) != null)
5542	>	t.result = (((tr = t.result) == null) ? sr :
5543	>	reducer.apply(tr, sr));
5544	>	s = t.rights = s.nextRight;
5545		}
6311	–	else if (t.casPending(c, c - 1))
6312	–	break;
5546		}
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);
5547		}
6324	–	return false;
5548		}
6326	–	public final U getRawResult() { return result; }
5549		}
5550
5551	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5551	>	@SuppressWarnings("serial")
5552	>	static final class MapReduceMappingsTask<K,V,U>
5553		extends BulkTask<K,V,U> {
5554	<	final BiFun<? super K, ? super V, ? extends U> transformer;
5555	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5554	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
5555	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5556		U result;
5557		MapReduceMappingsTask<K,V,U> rights, nextRight;
5558		MapReduceMappingsTask
5559	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5559	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5560		MapReduceMappingsTask<K,V,U> nextRight,
5561	<	BiFun<? super K, ? super V, ? extends U> transformer,
5562	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5563	<	super(m, p, b); this.nextRight = nextRight;
5561	>	BiFunction<? super K, ? super V, ? extends U> transformer,
5562	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5563	>	super(p, b, i, f, t); this.nextRight = nextRight;
5564		this.transformer = transformer;
5565		this.reducer = reducer;
5566		}
5567	<	@SuppressWarnings("unchecked") public final boolean exec() {
5568	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5569	<	this.transformer;
5570	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5571	<	this.reducer;
5572	<	if (transformer == null || reducer == null)
5573	<	return abortOnNullFunction();
5574	<	try {
5575	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6353	<	do {} while (!casPending(c = pending, c+1));
5567	>	public final U getRawResult() { return result; }
5568	>	public final void compute() {
5569	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
5570	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5571	>	if ((transformer = this.transformer) != null &&
5572	>	(reducer = this.reducer) != null) {
5573	>	for (int i = baseIndex, f, h; batch > 0 &&
5574	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5575	>	addToPendingCount(1);
5576		(rights = new MapReduceMappingsTask<K,V,U>
5577	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5577	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5578	>	rights, transformer, reducer)).fork();
5579		}
5580	<	U r = null, u;
5581	<	Object v;
5582	<	while ((v = advance()) != null) {
5583	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5580	>	U r = null;
5581	>	for (Node<K,V> p; (p = advance()) != null; ) {
5582	>	U u;
5583	>	if ((u = transformer.apply(p.key, p.val)) != null)
5584		r = (r == null) ? u : reducer.apply(r, u);
5585		}
5586		result = r;
5587	<	for (MapReduceMappingsTask<K,V,U> t = this, s;;) {
5588	<	int c; BulkTask<K,V,?> par; U tr, sr;
5589	<	if ((c = t.pending) == 0) {
5590	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5591	<	if ((sr = s.result) != null)
5592	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5593	<	}
5594	<	if ((par = t.parent) == null ||
5595	<	!(par instanceof MapReduceMappingsTask)) {
5596	<	t.quietlyComplete();
5597	<	break;
5598	<	}
6376	<	t = (MapReduceMappingsTask<K,V,U>)par;
5587	>	CountedCompleter<?> c;
5588	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5589	>	@SuppressWarnings("unchecked")
5590	>	MapReduceMappingsTask<K,V,U>
5591	>	t = (MapReduceMappingsTask<K,V,U>)c,
5592	>	s = t.rights;
5593	>	while (s != null) {
5594	>	U tr, sr;
5595	>	if ((sr = s.result) != null)
5596	>	t.result = (((tr = t.result) == null) ? sr :
5597	>	reducer.apply(tr, sr));
5598	>	s = t.rights = s.nextRight;
5599		}
6378	–	else if (t.casPending(c, c - 1))
6379	–	break;
5600		}
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);
5601		}
6391	–	return false;
5602		}
6393	–	public final U getRawResult() { return result; }
5603		}
5604
5605	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5605	>	@SuppressWarnings("serial")
5606	>	static final class MapReduceKeysToDoubleTask<K,V>
5607		extends BulkTask<K,V,Double> {
5608	<	final ObjectToDouble<? super K> transformer;
5609	<	final DoubleByDoubleToDouble reducer;
5608	>	final ToDoubleFunction<? super K> transformer;
5609	>	final DoubleBinaryOperator reducer;
5610		final double basis;
5611		double result;
5612		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5613		MapReduceKeysToDoubleTask
5614	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5614	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5615		MapReduceKeysToDoubleTask<K,V> nextRight,
5616	<	ObjectToDouble<? super K> transformer,
5616	>	ToDoubleFunction<? super K> transformer,
5617		double basis,
5618	<	DoubleByDoubleToDouble reducer) {
5619	<	super(m, p, b); this.nextRight = nextRight;
5618	>	DoubleBinaryOperator reducer) {
5619	>	super(p, b, i, f, t); this.nextRight = nextRight;
5620		this.transformer = transformer;
5621		this.basis = basis; this.reducer = reducer;
5622		}
5623	<	@SuppressWarnings("unchecked") public final boolean exec() {
5624	<	final ObjectToDouble<? super K> transformer =
5625	<	this.transformer;
5626	<	final DoubleByDoubleToDouble reducer = this.reducer;
5627	<	if (transformer == null || reducer == null)
5628	<	return abortOnNullFunction();
5629	<	try {
5630	<	final double id = this.basis;
5631	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5632	<	do {} while (!casPending(c = pending, c+1));
5623	>	public final Double getRawResult() { return result; }
5624	>	public final void compute() {
5625	>	final ToDoubleFunction<? super K> transformer;
5626	>	final DoubleBinaryOperator reducer;
5627	>	if ((transformer = this.transformer) != null &&
5628	>	(reducer = this.reducer) != null) {
5629	>	double r = this.basis;
5630	>	for (int i = baseIndex, f, h; batch > 0 &&
5631	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5632	>	addToPendingCount(1);
5633		(rights = new MapReduceKeysToDoubleTask<K,V>
5634	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5634	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5635	>	rights, transformer, r, reducer)).fork();
5636		}
5637	<	double r = id;
5638	<	while (advance() != null)
6428	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5637	>	for (Node<K,V> p; (p = advance()) != null; )
5638	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.key));
5639		result = r;
5640	<	for (MapReduceKeysToDoubleTask<K,V> t = this, s;;) {
5641	<	int c; BulkTask<K,V,?> par;
5642	<	if ((c = t.pending) == 0) {
5643	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5644	<	t.result = reducer.apply(t.result, s.result);
5645	<	}
5646	<	if ((par = t.parent) == null ||
5647	<	!(par instanceof MapReduceKeysToDoubleTask)) {
5648	<	t.quietlyComplete();
6439	<	break;
6440	<	}
6441	<	t = (MapReduceKeysToDoubleTask<K,V>)par;
5640	>	CountedCompleter<?> c;
5641	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5642	>	@SuppressWarnings("unchecked")
5643	>	MapReduceKeysToDoubleTask<K,V>
5644	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5645	>	s = t.rights;
5646	>	while (s != null) {
5647	>	t.result = reducer.applyAsDouble(t.result, s.result);
5648	>	s = t.rights = s.nextRight;
5649		}
6443	–	else if (t.casPending(c, c - 1))
6444	–	break;
5650		}
6446	–	} catch (Throwable ex) {
6447	–	return tryCompleteComputation(ex);
5651		}
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;
5652		}
6458	–	public final Double getRawResult() { return result; }
5653		}
5654
5655	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5655	>	@SuppressWarnings("serial")
5656	>	static final class MapReduceValuesToDoubleTask<K,V>
5657		extends BulkTask<K,V,Double> {
5658	<	final ObjectToDouble<? super V> transformer;
5659	<	final DoubleByDoubleToDouble reducer;
5658	>	final ToDoubleFunction<? super V> transformer;
5659	>	final DoubleBinaryOperator reducer;
5660		final double basis;
5661		double result;
5662		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5663		MapReduceValuesToDoubleTask
5664	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5664	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5665		MapReduceValuesToDoubleTask<K,V> nextRight,
5666	<	ObjectToDouble<? super V> transformer,
5666	>	ToDoubleFunction<? super V> transformer,
5667		double basis,
5668	<	DoubleByDoubleToDouble reducer) {
5669	<	super(m, p, b); this.nextRight = nextRight;
5668	>	DoubleBinaryOperator reducer) {
5669	>	super(p, b, i, f, t); this.nextRight = nextRight;
5670		this.transformer = transformer;
5671		this.basis = basis; this.reducer = reducer;
5672		}
5673	<	@SuppressWarnings("unchecked") public final boolean exec() {
5674	<	final ObjectToDouble<? super V> transformer =
5675	<	this.transformer;
5676	<	final DoubleByDoubleToDouble reducer = this.reducer;
5677	<	if (transformer == null || reducer == null)
5678	<	return abortOnNullFunction();
5679	<	try {
5680	<	final double id = this.basis;
5681	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5682	<	do {} while (!casPending(c = pending, c+1));
5673	>	public final Double getRawResult() { return result; }
5674	>	public final void compute() {
5675	>	final ToDoubleFunction<? super V> transformer;
5676	>	final DoubleBinaryOperator reducer;
5677	>	if ((transformer = this.transformer) != null &&
5678	>	(reducer = this.reducer) != null) {
5679	>	double r = this.basis;
5680	>	for (int i = baseIndex, f, h; batch > 0 &&
5681	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5682	>	addToPendingCount(1);
5683		(rights = new MapReduceValuesToDoubleTask<K,V>
5684	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5684	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5685	>	rights, transformer, r, reducer)).fork();
5686		}
5687	<	double r = id;
5688	<	Object v;
6493	<	while ((v = advance()) != null)
6494	<	r = reducer.apply(r, transformer.apply((V)v));
5687	>	for (Node<K,V> p; (p = advance()) != null; )
5688	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.val));
5689		result = r;
5690	<	for (MapReduceValuesToDoubleTask<K,V> t = this, s;;) {
5691	<	int c; BulkTask<K,V,?> par;
5692	<	if ((c = t.pending) == 0) {
5693	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5694	<	t.result = reducer.apply(t.result, s.result);
5695	<	}
5696	<	if ((par = t.parent) == null ||
5697	<	!(par instanceof MapReduceValuesToDoubleTask)) {
5698	<	t.quietlyComplete();
6505	<	break;
6506	<	}
6507	<	t = (MapReduceValuesToDoubleTask<K,V>)par;
5690	>	CountedCompleter<?> c;
5691	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5692	>	@SuppressWarnings("unchecked")
5693	>	MapReduceValuesToDoubleTask<K,V>
5694	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5695	>	s = t.rights;
5696	>	while (s != null) {
5697	>	t.result = reducer.applyAsDouble(t.result, s.result);
5698	>	s = t.rights = s.nextRight;
5699		}
6509	–	else if (t.casPending(c, c - 1))
6510	–	break;
5700		}
6512	–	} catch (Throwable ex) {
6513	–	return tryCompleteComputation(ex);
5701		}
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);
6521	–	}
6522	–	return false;
5702		}
6524	–	public final Double getRawResult() { return result; }
5703		}
5704
5705	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5705	>	@SuppressWarnings("serial")
5706	>	static final class MapReduceEntriesToDoubleTask<K,V>
5707		extends BulkTask<K,V,Double> {
5708	<	final ObjectToDouble<Map.Entry<K,V>> transformer;
5709	<	final DoubleByDoubleToDouble reducer;
5708	>	final ToDoubleFunction<Map.Entry<K,V>> transformer;
5709	>	final DoubleBinaryOperator reducer;
5710		final double basis;
5711		double result;
5712		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5713		MapReduceEntriesToDoubleTask
5714	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5714	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5715		MapReduceEntriesToDoubleTask<K,V> nextRight,
5716	<	ObjectToDouble<Map.Entry<K,V>> transformer,
5716	>	ToDoubleFunction<Map.Entry<K,V>> transformer,
5717		double basis,
5718	<	DoubleByDoubleToDouble reducer) {
5719	<	super(m, p, b); this.nextRight = nextRight;
5718	>	DoubleBinaryOperator reducer) {
5719	>	super(p, b, i, f, t); this.nextRight = nextRight;
5720		this.transformer = transformer;
5721		this.basis = basis; this.reducer = reducer;
5722		}
5723	<	@SuppressWarnings("unchecked") public final boolean exec() {
5724	<	final ObjectToDouble<Map.Entry<K,V>> transformer =
5725	<	this.transformer;
5726	<	final DoubleByDoubleToDouble reducer = this.reducer;
5727	<	if (transformer == null || reducer == null)
5728	<	return abortOnNullFunction();
5729	<	try {
5730	<	final double id = this.basis;
5731	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5732	<	do {} while (!casPending(c = pending, c+1));
5723	>	public final Double getRawResult() { return result; }
5724	>	public final void compute() {
5725	>	final ToDoubleFunction<Map.Entry<K,V>> transformer;
5726	>	final DoubleBinaryOperator reducer;
5727	>	if ((transformer = this.transformer) != null &&
5728	>	(reducer = this.reducer) != null) {
5729	>	double r = this.basis;
5730	>	for (int i = baseIndex, f, h; batch > 0 &&
5731	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5732	>	addToPendingCount(1);
5733		(rights = new MapReduceEntriesToDoubleTask<K,V>
5734	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5734	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5735	>	rights, transformer, r, reducer)).fork();
5736		}
5737	<	double r = id;
5738	<	Object v;
6559	<	while ((v = advance()) != null)
6560	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5737	>	for (Node<K,V> p; (p = advance()) != null; )
5738	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p));
5739		result = r;
5740	<	for (MapReduceEntriesToDoubleTask<K,V> t = this, s;;) {
5741	<	int c; BulkTask<K,V,?> par;
5742	<	if ((c = t.pending) == 0) {
5743	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5744	<	t.result = reducer.apply(t.result, s.result);
5745	<	}
5746	<	if ((par = t.parent) == null ||
5747	<	!(par instanceof MapReduceEntriesToDoubleTask)) {
5748	<	t.quietlyComplete();
6571	<	break;
6572	<	}
6573	<	t = (MapReduceEntriesToDoubleTask<K,V>)par;
5740	>	CountedCompleter<?> c;
5741	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5742	>	@SuppressWarnings("unchecked")
5743	>	MapReduceEntriesToDoubleTask<K,V>
5744	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5745	>	s = t.rights;
5746	>	while (s != null) {
5747	>	t.result = reducer.applyAsDouble(t.result, s.result);
5748	>	s = t.rights = s.nextRight;
5749		}
6575	–	else if (t.casPending(c, c - 1))
6576	–	break;
5750		}
6578	–	} catch (Throwable ex) {
6579	–	return tryCompleteComputation(ex);
5751		}
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);
6587	–	}
6588	–	return false;
5752		}
6590	–	public final Double getRawResult() { return result; }
5753		}
5754
5755	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5755	>	@SuppressWarnings("serial")
5756	>	static final class MapReduceMappingsToDoubleTask<K,V>
5757		extends BulkTask<K,V,Double> {
5758	<	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5759	<	final DoubleByDoubleToDouble reducer;
5758	>	final ToDoubleBiFunction<? super K, ? super V> transformer;
5759	>	final DoubleBinaryOperator reducer;
5760		final double basis;
5761		double result;
5762		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5763		MapReduceMappingsToDoubleTask
5764	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5764	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5765		MapReduceMappingsToDoubleTask<K,V> nextRight,
5766	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
5766	>	ToDoubleBiFunction<? super K, ? super V> transformer,
5767		double basis,
5768	<	DoubleByDoubleToDouble reducer) {
5769	<	super(m, p, b); this.nextRight = nextRight;
5768	>	DoubleBinaryOperator reducer) {
5769	>	super(p, b, i, f, t); this.nextRight = nextRight;
5770		this.transformer = transformer;
5771		this.basis = basis; this.reducer = reducer;
5772		}
5773	<	@SuppressWarnings("unchecked") public final boolean exec() {
5774	<	final ObjectByObjectToDouble<? super K, ? super V> transformer =
5775	<	this.transformer;
5776	<	final DoubleByDoubleToDouble reducer = this.reducer;
5777	<	if (transformer == null || reducer == null)
5778	<	return abortOnNullFunction();
5779	<	try {
5780	<	final double id = this.basis;
5781	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5782	<	do {} while (!casPending(c = pending, c+1));
5773	>	public final Double getRawResult() { return result; }
5774	>	public final void compute() {
5775	>	final ToDoubleBiFunction<? super K, ? super V> transformer;
5776	>	final DoubleBinaryOperator reducer;
5777	>	if ((transformer = this.transformer) != null &&
5778	>	(reducer = this.reducer) != null) {
5779	>	double r = this.basis;
5780	>	for (int i = baseIndex, f, h; batch > 0 &&
5781	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5782	>	addToPendingCount(1);
5783		(rights = new MapReduceMappingsToDoubleTask<K,V>
5784	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5784	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5785	>	rights, transformer, r, reducer)).fork();
5786		}
5787	<	double r = id;
5788	<	Object v;
6625	<	while ((v = advance()) != null)
6626	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5787	>	for (Node<K,V> p; (p = advance()) != null; )
5788	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.key, p.val));
5789		result = r;
5790	<	for (MapReduceMappingsToDoubleTask<K,V> t = this, s;;) {
5791	<	int c; BulkTask<K,V,?> par;
5792	<	if ((c = t.pending) == 0) {
5793	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5794	<	t.result = reducer.apply(t.result, s.result);
5795	<	}
5796	<	if ((par = t.parent) == null ||
5797	<	!(par instanceof MapReduceMappingsToDoubleTask)) {
5798	<	t.quietlyComplete();
6637	<	break;
6638	<	}
6639	<	t = (MapReduceMappingsToDoubleTask<K,V>)par;
5790	>	CountedCompleter<?> c;
5791	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5792	>	@SuppressWarnings("unchecked")
5793	>	MapReduceMappingsToDoubleTask<K,V>
5794	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5795	>	s = t.rights;
5796	>	while (s != null) {
5797	>	t.result = reducer.applyAsDouble(t.result, s.result);
5798	>	s = t.rights = s.nextRight;
5799		}
6641	–	else if (t.casPending(c, c - 1))
6642	–	break;
5800		}
6644	–	} catch (Throwable ex) {
6645	–	return tryCompleteComputation(ex);
5801		}
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);
6653	–	}
6654	–	return false;
5802		}
6656	–	public final Double getRawResult() { return result; }
5803		}
5804
5805	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5805	>	@SuppressWarnings("serial")
5806	>	static final class MapReduceKeysToLongTask<K,V>
5807		extends BulkTask<K,V,Long> {
5808	<	final ObjectToLong<? super K> transformer;
5809	<	final LongByLongToLong reducer;
5808	>	final ToLongFunction<? super K> transformer;
5809	>	final LongBinaryOperator reducer;
5810		final long basis;
5811		long result;
5812		MapReduceKeysToLongTask<K,V> rights, nextRight;
5813		MapReduceKeysToLongTask
5814	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5814	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5815		MapReduceKeysToLongTask<K,V> nextRight,
5816	<	ObjectToLong<? super K> transformer,
5816	>	ToLongFunction<? super K> transformer,
5817		long basis,
5818	<	LongByLongToLong reducer) {
5819	<	super(m, p, b); this.nextRight = nextRight;
5818	>	LongBinaryOperator reducer) {
5819	>	super(p, b, i, f, t); this.nextRight = nextRight;
5820		this.transformer = transformer;
5821		this.basis = basis; this.reducer = reducer;
5822		}
5823	<	@SuppressWarnings("unchecked") public final boolean exec() {
5824	<	final ObjectToLong<? super K> transformer =
5825	<	this.transformer;
5826	<	final LongByLongToLong reducer = this.reducer;
5827	<	if (transformer == null || reducer == null)
5828	<	return abortOnNullFunction();
5829	<	try {
5830	<	final long id = this.basis;
5831	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5832	<	do {} while (!casPending(c = pending, c+1));
5823	>	public final Long getRawResult() { return result; }
5824	>	public final void compute() {
5825	>	final ToLongFunction<? super K> transformer;
5826	>	final LongBinaryOperator reducer;
5827	>	if ((transformer = this.transformer) != null &&
5828	>	(reducer = this.reducer) != null) {
5829	>	long r = this.basis;
5830	>	for (int i = baseIndex, f, h; batch > 0 &&
5831	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5832	>	addToPendingCount(1);
5833		(rights = new MapReduceKeysToLongTask<K,V>
5834	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5834	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5835	>	rights, transformer, r, reducer)).fork();
5836		}
5837	<	long r = id;
5838	<	while (advance() != null)
6691	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5837	>	for (Node<K,V> p; (p = advance()) != null; )
5838	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.key));
5839		result = r;
5840	<	for (MapReduceKeysToLongTask<K,V> t = this, s;;) {
5841	<	int c; BulkTask<K,V,?> par;
5842	<	if ((c = t.pending) == 0) {
5843	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5844	<	t.result = reducer.apply(t.result, s.result);
5845	<	}
5846	<	if ((par = t.parent) == null ||
5847	<	!(par instanceof MapReduceKeysToLongTask)) {
5848	<	t.quietlyComplete();
6702	<	break;
6703	<	}
6704	<	t = (MapReduceKeysToLongTask<K,V>)par;
5840	>	CountedCompleter<?> c;
5841	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5842	>	@SuppressWarnings("unchecked")
5843	>	MapReduceKeysToLongTask<K,V>
5844	>	t = (MapReduceKeysToLongTask<K,V>)c,
5845	>	s = t.rights;
5846	>	while (s != null) {
5847	>	t.result = reducer.applyAsLong(t.result, s.result);
5848	>	s = t.rights = s.nextRight;
5849		}
6706	–	else if (t.casPending(c, c - 1))
6707	–	break;
5850		}
6709	–	} catch (Throwable ex) {
6710	–	return tryCompleteComputation(ex);
6711	–	}
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);
5851		}
6719	–	return false;
5852		}
6721	–	public final Long getRawResult() { return result; }
5853		}
5854
5855	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5855	>	@SuppressWarnings("serial")
5856	>	static final class MapReduceValuesToLongTask<K,V>
5857		extends BulkTask<K,V,Long> {
5858	<	final ObjectToLong<? super V> transformer;
5859	<	final LongByLongToLong reducer;
5858	>	final ToLongFunction<? super V> transformer;
5859	>	final LongBinaryOperator reducer;
5860		final long basis;
5861		long result;
5862		MapReduceValuesToLongTask<K,V> rights, nextRight;
5863		MapReduceValuesToLongTask
5864	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5864	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5865		MapReduceValuesToLongTask<K,V> nextRight,
5866	<	ObjectToLong<? super V> transformer,
5866	>	ToLongFunction<? super V> transformer,
5867		long basis,
5868	<	LongByLongToLong reducer) {
5869	<	super(m, p, b); this.nextRight = nextRight;
5868	>	LongBinaryOperator reducer) {
5869	>	super(p, b, i, f, t); this.nextRight = nextRight;
5870		this.transformer = transformer;
5871		this.basis = basis; this.reducer = reducer;
5872		}
5873	<	@SuppressWarnings("unchecked") public final boolean exec() {
5874	<	final ObjectToLong<? super V> transformer =
5875	<	this.transformer;
5876	<	final LongByLongToLong reducer = this.reducer;
5877	<	if (transformer == null || reducer == null)
5878	<	return abortOnNullFunction();
5879	<	try {
5880	<	final long id = this.basis;
5881	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5882	<	do {} while (!casPending(c = pending, c+1));
5873	>	public final Long getRawResult() { return result; }
5874	>	public final void compute() {
5875	>	final ToLongFunction<? super V> transformer;
5876	>	final LongBinaryOperator reducer;
5877	>	if ((transformer = this.transformer) != null &&
5878	>	(reducer = this.reducer) != null) {
5879	>	long r = this.basis;
5880	>	for (int i = baseIndex, f, h; batch > 0 &&
5881	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5882	>	addToPendingCount(1);
5883		(rights = new MapReduceValuesToLongTask<K,V>
5884	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5884	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5885	>	rights, transformer, r, reducer)).fork();
5886		}
5887	<	long r = id;
5888	<	Object v;
6756	<	while ((v = advance()) != null)
6757	<	r = reducer.apply(r, transformer.apply((V)v));
5887	>	for (Node<K,V> p; (p = advance()) != null; )
5888	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.val));
5889		result = r;
5890	<	for (MapReduceValuesToLongTask<K,V> t = this, s;;) {
5891	<	int c; BulkTask<K,V,?> par;
5892	<	if ((c = t.pending) == 0) {
5893	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5894	<	t.result = reducer.apply(t.result, s.result);
5895	<	}
5896	<	if ((par = t.parent) == null ||
5897	<	!(par instanceof MapReduceValuesToLongTask)) {
5898	<	t.quietlyComplete();
6768	<	break;
6769	<	}
6770	<	t = (MapReduceValuesToLongTask<K,V>)par;
5890	>	CountedCompleter<?> c;
5891	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5892	>	@SuppressWarnings("unchecked")
5893	>	MapReduceValuesToLongTask<K,V>
5894	>	t = (MapReduceValuesToLongTask<K,V>)c,
5895	>	s = t.rights;
5896	>	while (s != null) {
5897	>	t.result = reducer.applyAsLong(t.result, s.result);
5898	>	s = t.rights = s.nextRight;
5899		}
6772	–	else if (t.casPending(c, c - 1))
6773	–	break;
5900		}
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);
5901		}
6785	–	return false;
5902		}
6787	–	public final Long getRawResult() { return result; }
5903		}
5904
5905	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5905	>	@SuppressWarnings("serial")
5906	>	static final class MapReduceEntriesToLongTask<K,V>
5907		extends BulkTask<K,V,Long> {
5908	<	final ObjectToLong<Map.Entry<K,V>> transformer;
5909	<	final LongByLongToLong reducer;
5908	>	final ToLongFunction<Map.Entry<K,V>> transformer;
5909	>	final LongBinaryOperator reducer;
5910		final long basis;
5911		long result;
5912		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5913		MapReduceEntriesToLongTask
5914	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5914	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5915		MapReduceEntriesToLongTask<K,V> nextRight,
5916	<	ObjectToLong<Map.Entry<K,V>> transformer,
5916	>	ToLongFunction<Map.Entry<K,V>> transformer,
5917		long basis,
5918	<	LongByLongToLong reducer) {
5919	<	super(m, p, b); this.nextRight = nextRight;
5918	>	LongBinaryOperator reducer) {
5919	>	super(p, b, i, f, t); this.nextRight = nextRight;
5920		this.transformer = transformer;
5921		this.basis = basis; this.reducer = reducer;
5922		}
5923	<	@SuppressWarnings("unchecked") public final boolean exec() {
5924	<	final ObjectToLong<Map.Entry<K,V>> transformer =
5925	<	this.transformer;
5926	<	final LongByLongToLong reducer = this.reducer;
5927	<	if (transformer == null || reducer == null)
5928	<	return abortOnNullFunction();
5929	<	try {
5930	<	final long id = this.basis;
5931	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5932	<	do {} while (!casPending(c = pending, c+1));
5923	>	public final Long getRawResult() { return result; }
5924	>	public final void compute() {
5925	>	final ToLongFunction<Map.Entry<K,V>> transformer;
5926	>	final LongBinaryOperator reducer;
5927	>	if ((transformer = this.transformer) != null &&
5928	>	(reducer = this.reducer) != null) {
5929	>	long r = this.basis;
5930	>	for (int i = baseIndex, f, h; batch > 0 &&
5931	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5932	>	addToPendingCount(1);
5933		(rights = new MapReduceEntriesToLongTask<K,V>
5934	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5934	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5935	>	rights, transformer, r, reducer)).fork();
5936		}
5937	<	long r = id;
5938	<	Object v;
6822	<	while ((v = advance()) != null)
6823	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5937	>	for (Node<K,V> p; (p = advance()) != null; )
5938	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p));
5939		result = r;
5940	<	for (MapReduceEntriesToLongTask<K,V> t = this, s;;) {
5941	<	int c; BulkTask<K,V,?> par;
5942	<	if ((c = t.pending) == 0) {
5943	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5944	<	t.result = reducer.apply(t.result, s.result);
5945	<	}
5946	<	if ((par = t.parent) == null ||
5947	<	!(par instanceof MapReduceEntriesToLongTask)) {
5948	<	t.quietlyComplete();
6834	<	break;
6835	<	}
6836	<	t = (MapReduceEntriesToLongTask<K,V>)par;
5940	>	CountedCompleter<?> c;
5941	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5942	>	@SuppressWarnings("unchecked")
5943	>	MapReduceEntriesToLongTask<K,V>
5944	>	t = (MapReduceEntriesToLongTask<K,V>)c,
5945	>	s = t.rights;
5946	>	while (s != null) {
5947	>	t.result = reducer.applyAsLong(t.result, s.result);
5948	>	s = t.rights = s.nextRight;
5949		}
6838	–	else if (t.casPending(c, c - 1))
6839	–	break;
5950		}
6841	–	} catch (Throwable ex) {
6842	–	return tryCompleteComputation(ex);
5951		}
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);
6850	–	}
6851	–	return false;
5952		}
6853	–	public final Long getRawResult() { return result; }
5953		}
5954
5955	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5955	>	@SuppressWarnings("serial")
5956	>	static final class MapReduceMappingsToLongTask<K,V>
5957		extends BulkTask<K,V,Long> {
5958	<	final ObjectByObjectToLong<? super K, ? super V> transformer;
5959	<	final LongByLongToLong reducer;
5958	>	final ToLongBiFunction<? super K, ? super V> transformer;
5959	>	final LongBinaryOperator reducer;
5960		final long basis;
5961		long result;
5962		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5963		MapReduceMappingsToLongTask
5964	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5964	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5965		MapReduceMappingsToLongTask<K,V> nextRight,
5966	<	ObjectByObjectToLong<? super K, ? super V> transformer,
5966	>	ToLongBiFunction<? super K, ? super V> transformer,
5967		long basis,
5968	<	LongByLongToLong reducer) {
5969	<	super(m, p, b); this.nextRight = nextRight;
5968	>	LongBinaryOperator reducer) {
5969	>	super(p, b, i, f, t); this.nextRight = nextRight;
5970		this.transformer = transformer;
5971		this.basis = basis; this.reducer = reducer;
5972		}
5973	<	@SuppressWarnings("unchecked") public final boolean exec() {
5974	<	final ObjectByObjectToLong<? super K, ? super V> transformer =
5975	<	this.transformer;
5976	<	final LongByLongToLong reducer = this.reducer;
5977	<	if (transformer == null || reducer == null)
5978	<	return abortOnNullFunction();
5979	<	try {
5980	<	final long id = this.basis;
5981	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5982	<	do {} while (!casPending(c = pending, c+1));
5973	>	public final Long getRawResult() { return result; }
5974	>	public final void compute() {
5975	>	final ToLongBiFunction<? super K, ? super V> transformer;
5976	>	final LongBinaryOperator reducer;
5977	>	if ((transformer = this.transformer) != null &&
5978	>	(reducer = this.reducer) != null) {
5979	>	long r = this.basis;
5980	>	for (int i = baseIndex, f, h; batch > 0 &&
5981	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5982	>	addToPendingCount(1);
5983		(rights = new MapReduceMappingsToLongTask<K,V>
5984	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5984	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5985	>	rights, transformer, r, reducer)).fork();
5986		}
5987	<	long r = id;
5988	<	Object v;
6888	<	while ((v = advance()) != null)
6889	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5987	>	for (Node<K,V> p; (p = advance()) != null; )
5988	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.key, p.val));
5989		result = r;
5990	<	for (MapReduceMappingsToLongTask<K,V> t = this, s;;) {
5991	<	int c; BulkTask<K,V,?> par;
5992	<	if ((c = t.pending) == 0) {
5993	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5994	<	t.result = reducer.apply(t.result, s.result);
5995	<	}
5996	<	if ((par = t.parent) == null ||
5997	<	!(par instanceof MapReduceMappingsToLongTask)) {
5998	<	t.quietlyComplete();
6900	<	break;
6901	<	}
6902	<	t = (MapReduceMappingsToLongTask<K,V>)par;
5990	>	CountedCompleter<?> c;
5991	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5992	>	@SuppressWarnings("unchecked")
5993	>	MapReduceMappingsToLongTask<K,V>
5994	>	t = (MapReduceMappingsToLongTask<K,V>)c,
5995	>	s = t.rights;
5996	>	while (s != null) {
5997	>	t.result = reducer.applyAsLong(t.result, s.result);
5998	>	s = t.rights = s.nextRight;
5999		}
6904	–	else if (t.casPending(c, c - 1))
6905	–	break;
6000		}
6907	–	} catch (Throwable ex) {
6908	–	return tryCompleteComputation(ex);
6001		}
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;
6002		}
6919	–	public final Long getRawResult() { return result; }
6003		}
6004
6005	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
6005	>	@SuppressWarnings("serial")
6006	>	static final class MapReduceKeysToIntTask<K,V>
6007		extends BulkTask<K,V,Integer> {
6008	<	final ObjectToInt<? super K> transformer;
6009	<	final IntByIntToInt reducer;
6008	>	final ToIntFunction<? super K> transformer;
6009	>	final IntBinaryOperator reducer;
6010		final int basis;
6011		int result;
6012		MapReduceKeysToIntTask<K,V> rights, nextRight;
6013		MapReduceKeysToIntTask
6014	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6014	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6015		MapReduceKeysToIntTask<K,V> nextRight,
6016	<	ObjectToInt<? super K> transformer,
6016	>	ToIntFunction<? super K> transformer,
6017		int basis,
6018	<	IntByIntToInt reducer) {
6019	<	super(m, p, b); this.nextRight = nextRight;
6018	>	IntBinaryOperator reducer) {
6019	>	super(p, b, i, f, t); this.nextRight = nextRight;
6020		this.transformer = transformer;
6021		this.basis = basis; this.reducer = reducer;
6022		}
6023	<	@SuppressWarnings("unchecked") public final boolean exec() {
6024	<	final ObjectToInt<? super K> transformer =
6025	<	this.transformer;
6026	<	final IntByIntToInt reducer = this.reducer;
6027	<	if (transformer == null || reducer == null)
6028	<	return abortOnNullFunction();
6029	<	try {
6030	<	final int id = this.basis;
6031	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6032	<	do {} while (!casPending(c = pending, c+1));
6023	>	public final Integer getRawResult() { return result; }
6024	>	public final void compute() {
6025	>	final ToIntFunction<? super K> transformer;
6026	>	final IntBinaryOperator reducer;
6027	>	if ((transformer = this.transformer) != null &&
6028	>	(reducer = this.reducer) != null) {
6029	>	int r = this.basis;
6030	>	for (int i = baseIndex, f, h; batch > 0 &&
6031	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6032	>	addToPendingCount(1);
6033		(rights = new MapReduceKeysToIntTask<K,V>
6034	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6034	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6035	>	rights, transformer, r, reducer)).fork();
6036		}
6037	<	int r = id;
6038	<	while (advance() != null)
6954	<	r = reducer.apply(r, transformer.apply((K)nextKey));
6037	>	for (Node<K,V> p; (p = advance()) != null; )
6038	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.key));
6039		result = r;
6040	<	for (MapReduceKeysToIntTask<K,V> t = this, s;;) {
6041	<	int c; BulkTask<K,V,?> par;
6042	<	if ((c = t.pending) == 0) {
6043	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6044	<	t.result = reducer.apply(t.result, s.result);
6045	<	}
6046	<	if ((par = t.parent) == null ||
6047	<	!(par instanceof MapReduceKeysToIntTask)) {
6048	<	t.quietlyComplete();
6965	<	break;
6966	<	}
6967	<	t = (MapReduceKeysToIntTask<K,V>)par;
6040	>	CountedCompleter<?> c;
6041	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6042	>	@SuppressWarnings("unchecked")
6043	>	MapReduceKeysToIntTask<K,V>
6044	>	t = (MapReduceKeysToIntTask<K,V>)c,
6045	>	s = t.rights;
6046	>	while (s != null) {
6047	>	t.result = reducer.applyAsInt(t.result, s.result);
6048	>	s = t.rights = s.nextRight;
6049		}
6969	–	else if (t.casPending(c, c - 1))
6970	–	break;
6050		}
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);
6051		}
6982	–	return false;
6052		}
6984	–	public final Integer getRawResult() { return result; }
6053		}
6054
6055	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
6055	>	@SuppressWarnings("serial")
6056	>	static final class MapReduceValuesToIntTask<K,V>
6057		extends BulkTask<K,V,Integer> {
6058	<	final ObjectToInt<? super V> transformer;
6059	<	final IntByIntToInt reducer;
6058	>	final ToIntFunction<? super V> transformer;
6059	>	final IntBinaryOperator reducer;
6060		final int basis;
6061		int result;
6062		MapReduceValuesToIntTask<K,V> rights, nextRight;
6063		MapReduceValuesToIntTask
6064	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6064	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6065		MapReduceValuesToIntTask<K,V> nextRight,
6066	<	ObjectToInt<? super V> transformer,
6066	>	ToIntFunction<? super V> transformer,
6067		int basis,
6068	<	IntByIntToInt reducer) {
6069	<	super(m, p, b); this.nextRight = nextRight;
6068	>	IntBinaryOperator reducer) {
6069	>	super(p, b, i, f, t); this.nextRight = nextRight;
6070		this.transformer = transformer;
6071		this.basis = basis; this.reducer = reducer;
6072		}
6073	<	@SuppressWarnings("unchecked") public final boolean exec() {
6074	<	final ObjectToInt<? super V> transformer =
6075	<	this.transformer;
6076	<	final IntByIntToInt reducer = this.reducer;
6077	<	if (transformer == null || reducer == null)
6078	<	return abortOnNullFunction();
6079	<	try {
6080	<	final int id = this.basis;
6081	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6082	<	do {} while (!casPending(c = pending, c+1));
6073	>	public final Integer getRawResult() { return result; }
6074	>	public final void compute() {
6075	>	final ToIntFunction<? super V> transformer;
6076	>	final IntBinaryOperator reducer;
6077	>	if ((transformer = this.transformer) != null &&
6078	>	(reducer = this.reducer) != null) {
6079	>	int r = this.basis;
6080	>	for (int i = baseIndex, f, h; batch > 0 &&
6081	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6082	>	addToPendingCount(1);
6083		(rights = new MapReduceValuesToIntTask<K,V>
6084	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6084	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6085	>	rights, transformer, r, reducer)).fork();
6086		}
6087	<	int r = id;
6088	<	Object v;
7019	<	while ((v = advance()) != null)
7020	<	r = reducer.apply(r, transformer.apply((V)v));
6087	>	for (Node<K,V> p; (p = advance()) != null; )
6088	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.val));
6089		result = r;
6090	<	for (MapReduceValuesToIntTask<K,V> t = this, s;;) {
6091	<	int c; BulkTask<K,V,?> par;
6092	<	if ((c = t.pending) == 0) {
6093	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6094	<	t.result = reducer.apply(t.result, s.result);
6095	<	}
6096	<	if ((par = t.parent) == null ||
6097	<	!(par instanceof MapReduceValuesToIntTask)) {
6098	<	t.quietlyComplete();
7031	<	break;
7032	<	}
7033	<	t = (MapReduceValuesToIntTask<K,V>)par;
6090	>	CountedCompleter<?> c;
6091	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6092	>	@SuppressWarnings("unchecked")
6093	>	MapReduceValuesToIntTask<K,V>
6094	>	t = (MapReduceValuesToIntTask<K,V>)c,
6095	>	s = t.rights;
6096	>	while (s != null) {
6097	>	t.result = reducer.applyAsInt(t.result, s.result);
6098	>	s = t.rights = s.nextRight;
6099		}
7035	–	else if (t.casPending(c, c - 1))
7036	–	break;
6100		}
7038	–	} catch (Throwable ex) {
7039	–	return tryCompleteComputation(ex);
7040	–	}
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);
6101		}
7048	–	return false;
6102		}
7050	–	public final Integer getRawResult() { return result; }
6103		}
6104
6105	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
6105	>	@SuppressWarnings("serial")
6106	>	static final class MapReduceEntriesToIntTask<K,V>
6107		extends BulkTask<K,V,Integer> {
6108	<	final ObjectToInt<Map.Entry<K,V>> transformer;
6109	<	final IntByIntToInt reducer;
6108	>	final ToIntFunction<Map.Entry<K,V>> transformer;
6109	>	final IntBinaryOperator reducer;
6110		final int basis;
6111		int result;
6112		MapReduceEntriesToIntTask<K,V> rights, nextRight;
6113		MapReduceEntriesToIntTask
6114	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6114	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6115		MapReduceEntriesToIntTask<K,V> nextRight,
6116	<	ObjectToInt<Map.Entry<K,V>> transformer,
6116	>	ToIntFunction<Map.Entry<K,V>> transformer,
6117		int basis,
6118	<	IntByIntToInt reducer) {
6119	<	super(m, p, b); this.nextRight = nextRight;
6118	>	IntBinaryOperator reducer) {
6119	>	super(p, b, i, f, t); this.nextRight = nextRight;
6120		this.transformer = transformer;
6121		this.basis = basis; this.reducer = reducer;
6122		}
6123	<	@SuppressWarnings("unchecked") public final boolean exec() {
6124	<	final ObjectToInt<Map.Entry<K,V>> transformer =
6125	<	this.transformer;
6126	<	final IntByIntToInt reducer = this.reducer;
6127	<	if (transformer == null || reducer == null)
6128	<	return abortOnNullFunction();
6129	<	try {
6130	<	final int id = this.basis;
6131	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6132	<	do {} while (!casPending(c = pending, c+1));
6123	>	public final Integer getRawResult() { return result; }
6124	>	public final void compute() {
6125	>	final ToIntFunction<Map.Entry<K,V>> transformer;
6126	>	final IntBinaryOperator reducer;
6127	>	if ((transformer = this.transformer) != null &&
6128	>	(reducer = this.reducer) != null) {
6129	>	int r = this.basis;
6130	>	for (int i = baseIndex, f, h; batch > 0 &&
6131	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6132	>	addToPendingCount(1);
6133		(rights = new MapReduceEntriesToIntTask<K,V>
6134	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6134	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6135	>	rights, transformer, r, reducer)).fork();
6136		}
6137	<	int r = id;
6138	<	Object v;
7085	<	while ((v = advance()) != null)
7086	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
6137	>	for (Node<K,V> p; (p = advance()) != null; )
6138	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p));
6139		result = r;
6140	<	for (MapReduceEntriesToIntTask<K,V> t = this, s;;) {
6141	<	int c; BulkTask<K,V,?> par;
6142	<	if ((c = t.pending) == 0) {
6143	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6144	<	t.result = reducer.apply(t.result, s.result);
6145	<	}
6146	<	if ((par = t.parent) == null ||
6147	<	!(par instanceof MapReduceEntriesToIntTask)) {
6148	<	t.quietlyComplete();
7097	<	break;
7098	<	}
7099	<	t = (MapReduceEntriesToIntTask<K,V>)par;
6140	>	CountedCompleter<?> c;
6141	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6142	>	@SuppressWarnings("unchecked")
6143	>	MapReduceEntriesToIntTask<K,V>
6144	>	t = (MapReduceEntriesToIntTask<K,V>)c,
6145	>	s = t.rights;
6146	>	while (s != null) {
6147	>	t.result = reducer.applyAsInt(t.result, s.result);
6148	>	s = t.rights = s.nextRight;
6149		}
7101	–	else if (t.casPending(c, c - 1))
7102	–	break;
6150		}
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);
6151		}
7114	–	return false;
6152		}
7116	–	public final Integer getRawResult() { return result; }
6153		}
6154
6155	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
6155	>	@SuppressWarnings("serial")
6156	>	static final class MapReduceMappingsToIntTask<K,V>
6157		extends BulkTask<K,V,Integer> {
6158	<	final ObjectByObjectToInt<? super K, ? super V> transformer;
6159	<	final IntByIntToInt reducer;
6158	>	final ToIntBiFunction<? super K, ? super V> transformer;
6159	>	final IntBinaryOperator reducer;
6160		final int basis;
6161		int result;
6162		MapReduceMappingsToIntTask<K,V> rights, nextRight;
6163		MapReduceMappingsToIntTask
6164	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6165	<	MapReduceMappingsToIntTask<K,V> rights,
6166	<	ObjectByObjectToInt<? super K, ? super V> transformer,
6164	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6165	>	MapReduceMappingsToIntTask<K,V> nextRight,
6166	>	ToIntBiFunction<? super K, ? super V> transformer,
6167		int basis,
6168	<	IntByIntToInt reducer) {
6169	<	super(m, p, b); this.nextRight = nextRight;
6168	>	IntBinaryOperator reducer) {
6169	>	super(p, b, i, f, t); this.nextRight = nextRight;
6170		this.transformer = transformer;
6171		this.basis = basis; this.reducer = reducer;
6172		}
6173	<	@SuppressWarnings("unchecked") public final boolean exec() {
6174	<	final ObjectByObjectToInt<? super K, ? super V> transformer =
6175	<	this.transformer;
6176	<	final IntByIntToInt reducer = this.reducer;
6177	<	if (transformer == null || reducer == null)
6178	<	return abortOnNullFunction();
6179	<	try {
6180	<	final int id = this.basis;
6181	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6182	<	do {} while (!casPending(c = pending, c+1));
6173	>	public final Integer getRawResult() { return result; }
6174	>	public final void compute() {
6175	>	final ToIntBiFunction<? super K, ? super V> transformer;
6176	>	final IntBinaryOperator reducer;
6177	>	if ((transformer = this.transformer) != null &&
6178	>	(reducer = this.reducer) != null) {
6179	>	int r = this.basis;
6180	>	for (int i = baseIndex, f, h; batch > 0 &&
6181	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6182	>	addToPendingCount(1);
6183		(rights = new MapReduceMappingsToIntTask<K,V>
6184	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6184	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6185	>	rights, transformer, r, reducer)).fork();
6186		}
6187	<	int r = id;
6188	<	Object v;
7151	<	while ((v = advance()) != null)
7152	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
6187	>	for (Node<K,V> p; (p = advance()) != null; )
6188	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.key, p.val));
6189		result = r;
6190	<	for (MapReduceMappingsToIntTask<K,V> t = this, s;;) {
6191	<	int c; BulkTask<K,V,?> par;
6192	<	if ((c = t.pending) == 0) {
6193	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6194	<	t.result = reducer.apply(t.result, s.result);
6195	<	}
6196	<	if ((par = t.parent) == null ||
6197	<	!(par instanceof MapReduceMappingsToIntTask)) {
6198	<	t.quietlyComplete();
7163	<	break;
7164	<	}
7165	<	t = (MapReduceMappingsToIntTask<K,V>)par;
6190	>	CountedCompleter<?> c;
6191	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6192	>	@SuppressWarnings("unchecked")
6193	>	MapReduceMappingsToIntTask<K,V>
6194	>	t = (MapReduceMappingsToIntTask<K,V>)c,
6195	>	s = t.rights;
6196	>	while (s != null) {
6197	>	t.result = reducer.applyAsInt(t.result, s.result);
6198	>	s = t.rights = s.nextRight;
6199		}
7167	–	else if (t.casPending(c, c - 1))
7168	–	break;
6200		}
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);
6201		}
7180	–	return false;
6202		}
7182	–	public final Integer getRawResult() { return result; }
6203		}
6204
6205		// Unsafe mechanics
6206	<	private static final sun.misc.Unsafe UNSAFE;
6207	<	private static final long counterOffset;
6208	<	private static final long sizeCtlOffset;
6206	>	private static final sun.misc.Unsafe U;
6207	>	private static final long SIZECTL;
6208	>	private static final long TRANSFERINDEX;
6209	>	private static final long BASECOUNT;
6210	>	private static final long CELLSBUSY;
6211	>	private static final long CELLVALUE;
6212		private static final long ABASE;
6213		private static final int ASHIFT;
6214
6215		static {
7193	–	int ss;
6216		try {
6217	<	UNSAFE = sun.misc.Unsafe.getUnsafe();
6217	>	U = sun.misc.Unsafe.getUnsafe();
6218		Class<?> k = ConcurrentHashMap.class;
6219	<	counterOffset = UNSAFE.objectFieldOffset
7198	<	(k.getDeclaredField("counter"));
7199	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6219	>	SIZECTL = U.objectFieldOffset
6220		(k.getDeclaredField("sizeCtl"));
6221	<	Class<?> sc = Node[].class;
6222	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6223	<	ss = UNSAFE.arrayIndexScale(sc);
6221	>	TRANSFERINDEX = U.objectFieldOffset
6222	>	(k.getDeclaredField("transferIndex"));
6223	>	BASECOUNT = U.objectFieldOffset
6224	>	(k.getDeclaredField("baseCount"));
6225	>	CELLSBUSY = U.objectFieldOffset
6226	>	(k.getDeclaredField("cellsBusy"));
6227	>	Class<?> ck = CounterCell.class;
6228	>	CELLVALUE = U.objectFieldOffset
6229	>	(ck.getDeclaredField("value"));
6230	>	Class<?> ak = Node[].class;
6231	>	ABASE = U.arrayBaseOffset(ak);
6232	>	int scale = U.arrayIndexScale(ak);
6233	>	if ((scale & (scale - 1)) != 0)
6234	>	throw new Error("data type scale not a power of two");
6235	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6236		} catch (Exception e) {
6237		throw new Error(e);
6238		}
7207	–	if ((ss & (ss-1)) != 0)
7208	–	throw new Error("data type scale not a power of two");
7209	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6239		}
6240		}

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