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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 1.224 by dl, Tue Jun 18 17:11:45 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.Arrays;
14	–	import java.util.Map;
15	–	import java.util.Set;
14		import java.util.Collection;
15	<	import java.util.AbstractMap;
16	<	import java.util.AbstractSet;
17	<	import java.util.AbstractCollection;
20	<	import java.util.Hashtable;
15	>	import java.util.Comparator;
16	>	import java.util.ConcurrentModificationException;
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 64 | Line 76 | import java.io.Serializable;
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 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.
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> All arguments to all task methods must be non-null.
206	<	*
207	<	* <p><em>jsr166e note: During transition, this class
208	<	* uses nested functional interfaces with different names but the
209	<	* same forms as those expected for JDK8.<em>
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>
221	<	implements ConcurrentMap<K, V>, Serializable {
238	>	public class ConcurrentHashMap<K,V> implements ConcurrentMap<K,V>, Serializable {
239		private static final long serialVersionUID = 7249069246763182397L;
240
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	–
241		/*
242		* Overview:
243		*
#	Line 301 | Line 248 | public class ConcurrentHashMap<K, V>
248		* the same or better than java.util.HashMap, and to support high
249		* initial insertion rates on an empty table by many threads.
250		*
251	<	* Each key-value mapping is held in a Node.  Because Node fields
252	<	* can contain special values, they are defined using plain Object
253	<	* types. Similarly in turn, all internal methods that use them
254	<	* work off Object types. And similarly, so do the internal
255	<	* methods of auxiliary iterator and view classes.  All public
256	<	* generic typed methods relay in/out of these internal methods,
257	<	* supplying null-checks and casts as needed. This also allows
258	<	* many of the public methods to be factored into a smaller number
259	<	* of internal methods (although sadly not so for the five
260	<	* variants of put-related operations). The validation-based
261	<	* approach explained below leads to a lot of code sprawl because
262	<	* retry-control precludes factoring into smaller methods.
251	>	* This map usually acts as a binned (bucketed) hash table.  Each
252	>	* key-value mapping is held in a Node.  Most nodes are instances
253	>	* of the basic Node class with hash, key, value, and next
254	>	* fields. However, various subclasses exist: TreeNodes are
255	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
256	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
257	>	* of bins during resizing. ReservationNodes are used as
258	>	* placeholders while establishing values in computeIfAbsent and
259	>	* related methods.  The types TreeBin, ForwardingNode, and
260	>	* ReservationNode do not hold normal user keys, values, or
261	>	* hashes, and are readily distinguishable during search etc
262	>	* because they have negative hash fields and null key and value
263	>	* fields. (These special nodes are either uncommon or transient,
264	>	* so the impact of carrying around some unused fields is
265	>	* insignficant.)
266		*
267		* The table is lazily initialized to a power-of-two size upon the
268		* first insertion.  Each bin in the table normally contains a
#	Line 320 | Line 270 | public class ConcurrentHashMap<K, V>
270		* Table accesses require volatile/atomic reads, writes, and
271		* CASes.  Because there is no other way to arrange this without
272		* adding further indirections, we use intrinsics
273	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
274	<	* are always accurately traversable under volatile reads, so long
275	<	* as lookups check hash code and non-nullness of value before
276	<	* checking key equality.
277	<	*
278	<	* 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).
273	>	* (sun.misc.Unsafe) operations.
274	>	*
275	>	* We use the top (sign) bit of Node hash fields for control
276	>	* purposes -- it is available anyway because of addressing
277	>	* constraints.  Nodes with negative hash fields are specially
278	>	* handled or ignored in map methods.
279		*
280		* Insertion (via put or its variants) of the first node in an
281		* empty bin is performed by just CASing it to the bin.  This is
#	Line 346 | Line 284 | public class ConcurrentHashMap<K, V>
284		* delete, and replace) require locks.  We do not want to waste
285		* the space required to associate a distinct lock object with
286		* each bin, so instead use the first node of a bin list itself as
287	<	* a lock. Blocking support for these locks relies on the builtin
288	<	* "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.
287	>	* a lock. Locking support for these locks relies on builtin
288	>	* "synchronized" monitors.
289		*
290		* Using the first node of a list as a lock does not by itself
291		* suffice though: When a node is locked, any update must first
292		* validate that it is still the first node after locking it, and
293		* retry if not. Because new nodes are always appended to lists,
294		* once a node is first in a bin, it remains first until deleted
295	<	* 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.
295	>	* or the bin becomes invalidated (upon resizing).
296		*
297		* The main disadvantage of per-bin locks is that other update
298		* operations on other nodes in a bin list protected by the same
#	Line 394 | Line 325 | public class ConcurrentHashMap<K, V>
325		* sometimes deviate significantly from uniform randomness.  This
326		* includes the case when N > (1<<30), so some keys MUST collide.
327		* Similarly for dumb or hostile usages in which multiple keys are
328	<	* designed to have identical hash codes. Also, although we guard
329	<	* against the worst effects of this (see method spread), sets of
330	<	* hashes may differ only in bits that do not impact their bin
331	<	* index for a given power-of-two mask.  So we use a secondary
332	<	* strategy that applies when the number of nodes in a bin exceeds
333	<	* 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
328	>	* designed to have identical hash codes or ones that differs only
329	>	* in masked-out high bits. So we use a secondary strategy that
330	>	* applies when the number of nodes in a bin exceeds a
331	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
332	>	* specialized form of red-black trees), bounding search time to
333	>	* O(log N).  Each search step in a TreeBin is at least twice as
334		* slow as in a regular list, but given that N cannot exceed
335		* (1<<64) (before running out of addresses) this bounds search
336		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 413 | Line 341 | public class ConcurrentHashMap<K, V>
341		* iterators in the same way.
342		*
343		* The table is resized when occupancy exceeds a percentage
344	<	* threshold (nominally, 0.75, but see below).  Only a single
345	<	* thread performs the resize (using field "sizeCtl", to arrange
346	<	* exclusion), but the table otherwise remains usable for reads
347	<	* and updates. Resizing proceeds by transferring bins, one by
348	<	* one, from the table to the next table.  Because we are using
349	<	* power-of-two expansion, the elements from each bin must either
350	<	* stay at same index, or move with a power of two offset. We
351	<	* eliminate unnecessary node creation by catching cases where old
352	<	* nodes can be reused because their next fields won't change.  On
353	<	* average, only about one-sixth of them need cloning when a table
354	<	* doubles. The nodes they replace will be garbage collectable as
355	<	* soon as they are no longer referenced by any reader thread that
356	<	* may be in the midst of concurrently traversing table.  Upon
357	<	* transfer, the old table bin contains only a special forwarding
358	<	* node (with hash field "MOVED") that contains the next table as
359	<	* its key. On encountering a forwarding node, access and update
360	<	* operations restart, using the new table.
361	<	*
362	<	* Each bin transfer requires its bin lock. However, unlike other
363	<	* cases, a transfer can skip a bin if it fails to acquire its
364	<	* lock, and revisit it later (unless it is a TreeBin). Method
365	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
366	<	* have been skipped because of failure to acquire a lock, and
367	<	* blocks only if none are available (i.e., only very rarely).
368	<	* The transfer operation must also ensure that all accessible
369	<	* bins in both the old and new table are usable by any traversal.
370	<	* When there are no lock acquisition failures, this is arranged
371	<	* simply by proceeding from the last bin (table.length - 1) up
372	<	* towards the first.  Upon seeing a forwarding node, traversals
373	<	* (see class Iter) arrange to move to the new table
374	<	* without revisiting nodes.  However, when any node is skipped
375	<	* during a transfer, all earlier table bins may have become
376	<	* visible, so are initialized with a reverse-forwarding node back
377	<	* to the old table until the new ones are established. (This
378	<	* sometimes requires transiently locking a forwarding node, which
379	<	* is possible under the above encoding.) These more expensive
380	<	* mechanics trigger only when necessary.
344	>	* threshold (nominally, 0.75, but see below).  Any thread
345	>	* noticing an overfull bin may assist in resizing after the
346	>	* initiating thread allocates and sets up the replacement
347	>	* array. However, rather than stalling, these other threads may
348	>	* proceed with insertions etc.  The use of TreeBins shields us
349	>	* from the worst case effects of overfilling while resizes are in
350	>	* progress.  Resizing proceeds by transferring bins, one by one,
351	>	* from the table to the next table. To enable concurrency, the
352	>	* next table must be (incrementally) prefilled with place-holders
353	>	* serving as reverse forwarders to the old table.  Because we are
354	>	* using power-of-two expansion, the elements from each bin must
355	>	* either stay at same index, or move with a power of two
356	>	* offset. We eliminate unnecessary node creation by catching
357	>	* cases where old nodes can be reused because their next fields
358	>	* won't change.  On average, only about one-sixth of them need
359	>	* cloning when a table doubles. The nodes they replace will be
360	>	* garbage collectable as soon as they are no longer referenced by
361	>	* any reader thread that may be in the midst of concurrently
362	>	* traversing table.  Upon transfer, the old table bin contains
363	>	* only a special forwarding node (with hash field "MOVED") that
364	>	* contains the next table as its key. On encountering a
365	>	* forwarding node, access and update operations restart, using
366	>	* the new table.
367	>	*
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 by proceeding from the last bin
375	>	* (table.length - 1) up towards the first.  Upon seeing a
376	>	* forwarding node, traversals (see class Traverser) arrange to
377	>	* move to the new table without revisiting nodes.  However, to
378	>	* ensure that no intervening nodes are skipped, bin splitting can
379	>	* only begin after the associated reverse-forwarders are in
380	>	* place.
381		*
382		* The traversal scheme also applies to partial traversals of
383		* ranges of bins (via an alternate Traverser constructor)
#	Line 464 | Line 392 | public class ConcurrentHashMap<K, V>
392		* These cases attempt to override the initial capacity settings,
393		* but harmlessly fail to take effect in cases of races.
394		*
395	<	* The element count is maintained using a LongAdder, which avoids
396	<	* contention on updates but can encounter cache thrashing if read
397	<	* too frequently during concurrent access. To avoid reading so
398	<	* often, resizing is attempted either when a bin lock is
399	<	* contended, or upon adding to a bin already holding two or more
400	<	* nodes (checked before adding in the xIfAbsent methods, after
401	<	* adding in others). Under uniform hash distributions, the
402	<	* probability of this occurring at threshold is around 13%,
403	<	* meaning that only about 1 in 8 puts check threshold (and after
404	<	* resizing, many fewer do so). But this approximation has high
405	<	* variance for small table sizes, so we check on any collision
406	<	* for sizes <= 64. The bulk putAll operation further reduces
407	<	* contention by only committing count updates upon these size
408	<	* checks.
395	>	* The element count is maintained using a specialization of
396	>	* LongAdder. We need to incorporate a specialization rather than
397	>	* just use a LongAdder in order to access implicit
398	>	* contention-sensing that leads to creation of multiple
399	>	* CounterCells.  The counter mechanics avoid contention on
400	>	* updates but can encounter cache thrashing if read too
401	>	* frequently during concurrent access. To avoid reading so often,
402	>	* resizing under contention is attempted only upon adding to a
403	>	* bin already holding two or more nodes. Under uniform hash
404	>	* distributions, the probability of this occurring at threshold
405	>	* is around 13%, meaning that only about 1 in 8 puts check
406	>	* threshold (and after resizing, many fewer do so).
407	>	*
408	>	* TreeBins use a special form of comparison for search and
409	>	* related operations (which is the main reason we cannot use
410	>	* existing collections such as TreeMaps). TreeBins contain
411	>	* Comparable elements, but may contain others, as well as
412	>	* elements that are Comparable but not necessarily Comparable
413	>	* for the same T, so we cannot invoke compareTo among them. To
414	>	* handle this, the tree is ordered primarily by hash value, then
415	>	* by Comparable.compareTo order if applicable.  On lookup at a
416	>	* node, if elements are not comparable or compare as 0 then both
417	>	* left and right children may need to be searched in the case of
418	>	* tied hash values. (This corresponds to the full list search
419	>	* that would be necessary if all elements were non-Comparable and
420	>	* had tied hashes.)  The red-black balancing code is updated from
421	>	* pre-jdk-collections
422	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
423	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
424	>	* Algorithms" (CLR).
425	>	*
426	>	* TreeBins also require an additional locking mechanism.  While
427	>	* list traversal is always possible by readers even during
428	>	* updates, tree traversal is not, mainly beause of tree-rotations
429	>	* that may change the root node and/or its linkages.  TreeBins
430	>	* include a simple read-write lock mechanism parasitic on the
431	>	* main bin-synchronization strategy: Structural adjustments
432	>	* associated with an insertion or removal are already bin-locked
433	>	* (and so cannot conflict with other writers) but must wait for
434	>	* ongoing readers to finish. Since there can be only one such
435	>	* waiter, we use a simple scheme using a single "waiter" field to
436	>	* block writers.  However, readers need never block.  If the root
437	>	* lock is held, they proceed along the slow traversal path (via
438	>	* next-pointers) until the lock becomes available or the list is
439	>	* exhausted, whichever comes first. These cases are not fast, but
440	>	* maximize aggregate expected throughput.
441		*
442		* Maintaining API and serialization compatibility with previous
443		* versions of this class introduces several oddities. Mainly: We
#	Line 487 | Line 447 | public class ConcurrentHashMap<K, V>
447		* time that we can guarantee to honor it.) We also declare an
448		* unused "Segment" class that is instantiated in minimal form
449		* only when serializing.
450	+	*
451	+	* This file is organized to make things a little easier to follow
452	+	* while reading than they might otherwise: First the main static
453	+	* declarations and utilities, then fields, then main public
454	+	* methods (with a few factorings of multiple public methods into
455	+	* internal ones), then sizing methods, trees, traversers, and
456	+	* bulk operations.
457		*/
458
459		/* ---------------- Constants -------------- */
#	Line 528 | Line 495 | public class ConcurrentHashMap<K, V>
495		private static final float LOAD_FACTOR = 0.75f;
496
497		/**
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	–	/**
498		* The bin count threshold for using a tree rather than list for a
499	<	* bin.  The value reflects the approximate break-even point for
500	<	* using tree-based operations.
499	>	* bin.  Bins are converted to trees when adding an element to a
500	>	* bin with at least this many nodes. The value must be greater
501	>	* than 2, and should be at least 8 to mesh with assumptions in
502	>	* tree removal about conversion back to plain bins upon
503	>	* shrinkage.
504		*/
505	<	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 -------------- */
505	>	static final int TREEIFY_THRESHOLD = 8;
506
507		/**
508	<	* The array of bins. Lazily initialized upon first insertion.
509	<	* Size is always a power of two. Accessed directly by iterators.
508	>	* The bin count threshold for untreeifying a (split) bin during a
509	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
510	>	* most 6 to mesh with shrinkage detection under removal.
511		*/
512	<	transient volatile Node[] table;
512	>	static final int UNTREEIFY_THRESHOLD = 6;
513
514		/**
515	<	* The counter maintaining number of elements.
515	>	* The smallest table capacity for which bins may be treeified.
516	>	* (Otherwise the table is resized if too many nodes in a bin.)
517	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
518	>	* conflicts between resizing and treeification thresholds.
519		*/
520	<	private transient final LongAdder counter;
520	>	static final int MIN_TREEIFY_CAPACITY = 64;
521
522		/**
523	<	* Table initialization and resizing control.  When negative, the
524	<	* table is being initialized or resized. Otherwise, when table is
525	<	* null, holds the initial table size to use upon creation, or 0
526	<	* for default. After initialization, holds the next element count
527	<	* value upon which to resize the table.
523	>	* Minimum number of rebinnings per transfer step. Ranges are
524	>	* subdivided to allow multiple resizer threads.  This value
525	>	* serves as a lower bound to avoid resizers encountering
526	>	* excessive memory contention.  The value should be at least
527	>	* DEFAULT_CAPACITY.
528		*/
529	<	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 -------------- */
529	>	private static final int MIN_TRANSFER_STRIDE = 16;
530
531		/*
532	<	* 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.
532	>	* Encodings for Node hash fields. See above for explanation.
533		*/
534	<
535	<	static final Node tabAt(Node[] tab, int i) { // used by Iter
536	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
537	<	}
538	<
539	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
540	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
541	<	}
542	<
543	<	private static final void setTabAt(Node[] tab, int i, Node v) {
544	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
545	<	}
534	>	static final int MOVED     = 0x8fffffff; // (-1) hash for forwarding nodes
535	>	static final int TREEBIN   = 0x80000000; // hash for heads of treea
536	>	static final int RESERVED  = 0x80000001; // hash for transient reservations
537	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
538	>
539	>	/** Number of CPUS, to place bounds on some sizings */
540	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
541	>
542	>	/** For serialization compatibility. */
543	>	private static final ObjectStreamField[] serialPersistentFields = {
544	>	new ObjectStreamField("segments", Segment[].class),
545	>	new ObjectStreamField("segmentMask", Integer.TYPE),
546	>	new ObjectStreamField("segmentShift", Integer.TYPE)
547	>	};
548
549		/* ---------------- Nodes -------------- */
550
551		/**
552	<	* Key-value entry. Note that this is never exported out as a
553	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
554	<	* field of MOVED are special, and do not contain user keys or
555	<	* values.  Otherwise, keys are never null, and null val fields
556	<	* indicate that a node is in the process of being deleted or
557	<	* created. For purposes of read-only access, a key may be read
558	<	* before a val, but can only be used after checking val to be
559	<	* non-null.
560	<	*/
561	<	static class Node {
562	<	volatile int hash;
563	<	final Object key;
624	<	volatile Object val;
625	<	volatile Node next;
552	>	* Key-value entry.  This class is never exported out as a
553	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
554	>	* MapEntry below), but can be used for read-only traversals used
555	>	* in bulk tasks.  Subclasses of Node with a negativehash field
556	>	* are special, and contain null keys and values (but are never
557	>	* exported).  Otherwise, keys and vals are never null.
558	>	*/
559	>	static class Node<K,V> implements Map.Entry<K,V> {
560	>	final int hash;
561	>	final K key;
562	>	volatile V val;
563	>	Node<K,V> next;
564
565	<	Node(int hash, Object key, Object val, Node next) {
565	>	Node(int hash, K key, V val, Node<K,V> next) {
566		this.hash = hash;
567		this.key = key;
568		this.val = val;
569		this.next = next;
570		}
571
572	<	/** CompareAndSet the hash field */
573	<	final boolean casHash(int cmp, int val) {
574	<	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
575	<	}
576	<
577	<	/** 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;
572	>	public final K getKey()       { return key; }
573	>	public final V getValue()     { return val; }
574	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
575	>	public final String toString(){ return key + "=" + val; }
576	>	public final V setValue(V value) {
577	>	throw new UnsupportedOperationException();
578		}
579
580	<	/**
581	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
582	<	* read-lock to call getTreeNode, but during failure to get
583	<	* lock, searches along next links.
584	<	*/
585	<	final Object getValue(int h, Object k) {
586	<	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;
580	>	public final boolean equals(Object o) {
581	>	Object k, v, u; Map.Entry<?,?> e;
582	>	return ((o instanceof Map.Entry) &&
583	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
584	>	(v = e.getValue()) != null &&
585	>	(k == key || k.equals(key)) &&
586	>	(v == (u = val) || v.equals(u)));
587		}
588
589		/**
590	<	* Finds or adds a node.
899	<	* @return null if added
590	>	* Virtualized support for map.get(); overridden in subclasses.
591		*/
592	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
593	<	(int h, Object k, Object v) {
594	<	Class<?> c = k.getClass();
595	<	TreeNode pp = root, p = null;
596	<	int dir = 0;
597	<	while (pp != null) { // find existing node or leaf to insert at
598	<	int ph;  Object pk; Class<?> pc;
599	<	p = pp;
600	<	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;
592	>	Node<K,V> find(int h, Object k) {
593	>	Node<K,V> e = this;
594	>	if (k != null) {
595	>	do {
596	>	K ek;
597	>	if (e.hash == h &&
598	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
599	>	return e;
600	>	} while ((e = e.next) != null);
601		}
602		return null;
603		}
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	–	}
604		}
605
606	<	/* ---------------- Collision reduction methods -------------- */
606	>	/* ---------------- Static utilities -------------- */
607
608		/**
609	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
610	<	* Because the table uses power-of-two masking, sets of hashes
611	<	* that vary only in bits above the current mask will always
612	<	* collide. (Among known examples are sets of Float keys holding
613	<	* consecutive whole numbers in small tables.)  To counter this,
614	<	* we apply a transform that spreads the impact of higher bits
609	>	* Spreads (XORs) higher bits of hash to lower and also forces top
610	>	* bit to 0. Because the table uses power-of-two masking, sets of
611	>	* hashes that vary only in bits above the current mask will
612	>	* always collide. (Among known examples are sets of Float keys
613	>	* holding consecutive whole numbers in small tables.)  So we
614	>	* apply a transform that spreads the impact of higher bits
615		* downward. There is a tradeoff between speed, utility, and
616		* quality of bit-spreading. Because many common sets of hashes
617	<	* are already reasonably distributed across bits (so don't benefit
618	<	* from spreading), and because we use trees to handle large sets
619	<	* of collisions in bins, we don't need excessively high quality.
620	<	*/
621	<	private static final int spread(int h) {
622	<	h ^= (h >>> 18) ^ (h >>> 12);
1188	<	return (h ^ (h >>> 10)) & HASH_BITS;
1189	<	}
1190	<
1191	<	/**
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.
617	>	* are already reasonably distributed (so don't benefit from
618	>	* spreading), and because we use trees to handle large sets of
619	>	* collisions in bins, we just XOR some shifted bits in the
620	>	* cheapest possible way to reduce systematic lossage, as well as
621	>	* to incorporate impact of the highest bits that would otherwise
622	>	* never be used in index calculations because of table bounds.
623		*/
624	<	private final Object internalReplace(Object k, Object v, Object cv) {
625	<	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;
624	>	static final int spread(int h) {
625	>	return (h ^ (h >>> 16)) & HASH_BITS;
626		}
627
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	–
628		/**
629		* Returns a power of two table size for the given desired capacity.
630		* See Hackers Delight, sec 3.2
#	Line 2021 | Line 640 | public class ConcurrentHashMap<K, V>
640		}
641
642		/**
643	<	* Initializes table, using the size recorded in sizeCtl.
643	>	* Returns x's Class if it is of the form "class C implements
644	>	* Comparable<C>", else null.
645		*/
646	<	private final Node[] initTable() {
647	<	Node[] tab; int sc;
648	<	while ((tab = table) == null) {
649	<	if ((sc = sizeCtl) < 0)
650	<	Thread.yield(); // lost initialization race; just spin
651	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
652	<	try {
653	<	if ((tab = table) == null) {
654	<	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
655	<	tab = table = new Node[n];
656	<	sc = n - (n >>> 2);
657	<	}
658	<	} finally {
2039	<	sizeCtl = sc;
2040	<	}
2041	<	break;
2042	<	}
2043	<	}
2044	<	return tab;
2045	<	}
2046	<
2047	<	/**
2048	<	* If table is too small and not already resizing, creates next
2049	<	* table and transfers bins.  Rechecks occupancy after a transfer
2050	<	* to see if another resize is already needed because resizings
2051	<	* are lagging additions.
2052	<	*/
2053	<	private final void checkForResize() {
2054	<	Node[] tab; int n, sc;
2055	<	while ((tab = table) != null &&
2056	<	(n = tab.length) < MAXIMUM_CAPACITY &&
2057	<	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
2058	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2059	<	try {
2060	<	if (tab == table) {
2061	<	table = rebuild(tab);
2062	<	sc = (n << 1) - (n >>> 1);
646	>	static Class<?> comparableClassFor(Object x) {
647	>	if (x instanceof Comparable) {
648	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
649	>	if ((c = x.getClass()) == String.class) // bypass checks
650	>	return c;
651	>	if ((ts = c.getGenericInterfaces()) != null) {
652	>	for (int i = 0; i < ts.length; ++i) {
653	>	if (((t = ts[i]) instanceof ParameterizedType) &&
654	>	((p = (ParameterizedType)t).getRawType() ==
655	>	Comparable.class) &&
656	>	(as = p.getActualTypeArguments()) != null &&
657	>	as.length == 1 && as[0] == c) // type arg is c
658	>	return c;
659		}
2064	–	} finally {
2065	–	sizeCtl = sc;
660		}
661		}
662	+	return null;
663		}
664
665		/**
666	<	* Tries to presize table to accommodate the given number of elements.
667	<	*
2073	<	* @param size number of elements (doesn't need to be perfectly accurate)
666	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
667	>	* class), else 0.
668		*/
669	<	private final void tryPresize(int size) {
670	<	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
671	<	tableSizeFor(size + (size >>> 1) + 1);
672	<	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	<	}
669	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
670	>	static int compareComparables(Class<?> kc, Object k, Object x) {
671	>	return (x == null || x.getClass() != kc ? 0 :
672	>	((Comparable)k).compareTo(x));
673		}
674
675	+	/* ---------------- Table element access -------------- */
676	+
677		/*
678	<	* Moves and/or copies the nodes in each bin to new table. See
679	<	* above for explanation.
680	<	*
681	<	* @return the new table
682	<	*/
683	<	private static final Node[] rebuild(Node[] tab) {
684	<	int n = tab.length;
685	<	Node[] nextTab = new Node[n << 1];
686	<	Node fwd = new Node(MOVED, nextTab, null, null);
687	<	int[] buffer = null;       // holds bins to revisit; null until needed
688	<	Node rev = null;           // reverse forwarder; null until needed
689	<	int nbuffered = 0;         // the number of bins in buffer list
690	<	int bufferIndex = 0;       // buffer index of current buffered bin
691	<	int bin = n - 1;           // current non-buffered bin or -1 if none
692	<
693	<	for (int i = bin;;) {      // start upwards sweep
694	<	int fh; Node f;
695	<	if ((f = tabAt(tab, i)) == null) {
696	<	if (bin >= 0) {    // Unbuffered; no lock needed (or available)
697	<	if (!casTabAt(tab, i, f, fwd))
698	<	continue;
699	<	}
2132	<	else {             // transiently use a locked forwarding node
2133	<	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
2134	<	if (!casTabAt(tab, i, f, g))
2135	<	continue;
2136	<	setTabAt(nextTab, i, null);
2137	<	setTabAt(nextTab, i + n, null);
2138	<	setTabAt(tab, i, fwd);
2139	<	if (!g.casHash(MOVED|LOCKED, MOVED)) {
2140	<	g.hash = MOVED;
2141	<	synchronized (g) { g.notifyAll(); }
2142	<	}
2143	<	}
2144	<	}
2145	<	else if ((fh = f.hash) == MOVED) {
2146	<	Object fk = f.key;
2147	<	if (fk instanceof TreeBin) {
2148	<	TreeBin t = (TreeBin)fk;
2149	<	boolean validated = false;
2150	<	t.acquire(0);
2151	<	try {
2152	<	if (tabAt(tab, i) == f) {
2153	<	validated = true;
2154	<	splitTreeBin(nextTab, i, t);
2155	<	setTabAt(tab, i, fwd);
2156	<	}
2157	<	} finally {
2158	<	t.release(0);
2159	<	}
2160	<	if (!validated)
2161	<	continue;
2162	<	}
2163	<	}
2164	<	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
2165	<	boolean validated = false;
2166	<	try {              // split to lo and hi lists; copying as needed
2167	<	if (tabAt(tab, i) == f) {
2168	<	validated = true;
2169	<	splitBin(nextTab, i, f);
2170	<	setTabAt(tab, i, fwd);
2171	<	}
2172	<	} finally {
2173	<	if (!f.casHash(fh | LOCKED, fh)) {
2174	<	f.hash = fh;
2175	<	synchronized (f) { f.notifyAll(); };
2176	<	}
2177	<	}
2178	<	if (!validated)
2179	<	continue;
2180	<	}
2181	<	else {
2182	<	if (buffer == null) // initialize buffer for revisits
2183	<	buffer = new int[TRANSFER_BUFFER_SIZE];
2184	<	if (bin < 0 && bufferIndex > 0) {
2185	<	int j = buffer[--bufferIndex];
2186	<	buffer[bufferIndex] = i;
2187	<	i = j;         // swap with another bin
2188	<	continue;
2189	<	}
2190	<	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
2191	<	f.tryAwaitLock(tab, i);
2192	<	continue;      // no other options -- block
2193	<	}
2194	<	if (rev == null)   // initialize reverse-forwarder
2195	<	rev = new Node(MOVED, tab, null, null);
2196	<	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
2197	<	continue;      // recheck before adding to list
2198	<	buffer[nbuffered++] = i;
2199	<	setTabAt(nextTab, i, rev);     // install place-holders
2200	<	setTabAt(nextTab, i + n, rev);
2201	<	}
2202	<
2203	<	if (bin > 0)
2204	<	i = --bin;
2205	<	else if (buffer != null && nbuffered > 0) {
2206	<	bin = -1;
2207	<	i = buffer[bufferIndex = --nbuffered];
2208	<	}
2209	<	else
2210	<	return nextTab;
2211	<	}
678	>	* Volatile access methods are used for table elements as well as
679	>	* elements of in-progress next table while resizing.  All uses of
680	>	* the tab arguments must be null checked by callers.  All callers
681	>	* also paranoically precheck that tab's length is not zero (or an
682	>	* equivalent check), thus ensuring that any index argument taking
683	>	* the form of a hash value anded with (length - 1) is a valid
684	>	* index.  Note that, to be correct wrt arbitrary concurrency
685	>	* errors by users, these checks must operate on local variables,
686	>	* which accounts for some odd-looking inline assignments below.
687	>	* Note that calls to setTabAt always occur within locked regions,
688	>	* and so do not need full volatile semantics, but still require
689	>	* ordering to maintain concurrent readability.
690	>	*/
691	>
692	>	@SuppressWarnings("unchecked")
693	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
694	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
695	>	}
696	>
697	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
698	>	Node<K,V> c, Node<K,V> v) {
699	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
700		}
701
702	<	/**
703	<	* 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);
702	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
703	>	U.putOrderedObject(tab, ((long)i << ASHIFT) + ABASE, v);
704		}
705
706	+	/* ---------------- Fields -------------- */
707	+
708		/**
709	<	* Splits a tree bin into lo and hi parts; installs in given table.
709	>	* The array of bins. Lazily initialized upon first insertion.
710	>	* Size is always a power of two. Accessed directly by iterators.
711		*/
712	<	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	<	}
712	>	transient volatile Node<K,V>[] table;
713
714		/**
715	<	* Implementation for clear. Steps through each bin, removing all
2286	<	* nodes.
715	>	* The next table to use; non-null only while resizing.
716		*/
717	<	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	<	}
717	>	private transient volatile Node<K,V>[] nextTable;
718
719	<	/* ----------------Table Traversal -------------- */
719	>	/**
720	>	* Base counter value, used mainly when there is no contention,
721	>	* but also as a fallback during table initialization
722	>	* races. Updated via CAS.
723	>	*/
724	>	private transient volatile long baseCount;
725
726		/**
727	<	* Encapsulates traversal for methods such as containsValue; also
728	<	* serves as a base class for other iterators and bulk tasks.
729	<	*
730	<	* At each step, the iterator snapshots the key ("nextKey") and
731	<	* value ("nextVal") of a valid node (i.e., one that, at point of
732	<	* snapshot, has a non-null user value). Because val fields can
733	<	* change (including to null, indicating deletion), field nextVal
734	<	* 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
727	>	* Table initialization and resizing control.  When negative, the
728	>	* table is being initialized or resized: -1 for initialization,
729	>	* else -(1 + the number of active resizing threads).  Otherwise,
730	>	* when table is null, holds the initial table size to use upon
731	>	* creation, or 0 for default. After initialization, holds the
732	>	* next element count value upon which to resize the table.
733	>	*/
734	>	private transient volatile int sizeCtl;
735
736	<	/** Creates iterator for all entries in the table. */
737	<	Traverser(ConcurrentHashMap<K, V> map) {
738	<	this.map = map;
739	<	}
736	>	/**
737	>	* The next table index (plus one) to split while resizing.
738	>	*/
739	>	private transient volatile int transferIndex;
740
741	<	/** Creates iterator for split() methods */
742	<	Traverser(Traverser<K,V,?> it) {
743	<	ConcurrentHashMap<K, V> m; Node[] t;
744	<	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	<	}
741	>	/**
742	>	* The least available table index to split while resizing.
743	>	*/
744	>	private transient volatile int transferOrigin;
745
746	<	/**
747	<	* Advances next; returns nextVal or null if terminated.
748	<	* See above for explanation.
749	<	*/
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	<	}
746	>	/**
747	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
748	>	*/
749	>	private transient volatile int cellsBusy;
750
751	<	public final void remove() {
752	<	Object k = nextKey;
753	<	if (k == null && (advance() == null || (k = nextKey) == null))
754	<	throw new IllegalStateException();
2468	<	map.internalReplace(k, null, null);
2469	<	}
751	>	/**
752	>	* Table of counter cells. When non-null, size is a power of 2.
753	>	*/
754	>	private transient volatile CounterCell[] counterCells;
755
756	<	public final boolean hasNext() {
757	<	return nextVal != null || advance() != null;
758	<	}
756	>	// views
757	>	private transient KeySetView<K,V> keySet;
758	>	private transient ValuesView<K,V> values;
759	>	private transient EntrySetView<K,V> entrySet;
760
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	–	}
761
762		/* ---------------- Public operations -------------- */
763
#	Line 2484 | Line 765 | public class ConcurrentHashMap<K, V>
765		* Creates a new, empty map with the default initial table size (16).
766		*/
767		public ConcurrentHashMap() {
2487	–	this.counter = new LongAdder();
768		}
769
770		/**
#	Line 2503 | Line 783 | public class ConcurrentHashMap<K, V>
783		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
784		MAXIMUM_CAPACITY :
785		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2506	–	this.counter = new LongAdder();
786		this.sizeCtl = cap;
787		}
788
#	Line 2513 | Line 792 | public class ConcurrentHashMap<K, V>
792		* @param m the map
793		*/
794		public ConcurrentHashMap(Map<? extends K, ? extends V> m) {
2516	–	this.counter = new LongAdder();
795		this.sizeCtl = DEFAULT_CAPACITY;
796	<	internalPutAll(m);
796	>	putAll(m);
797		}
798
799		/**
#	Line 2556 | Line 834 | public class ConcurrentHashMap<K, V>
834		* nonpositive
835		*/
836		public ConcurrentHashMap(int initialCapacity,
837	<	float loadFactor, int concurrencyLevel) {
837	>	float loadFactor, int concurrencyLevel) {
838		if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
839		throw new IllegalArgumentException();
840		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
#	Line 2564 | Line 842 | public class ConcurrentHashMap<K, V>
842		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
843		int cap = (size >= (long)MAXIMUM_CAPACITY) ?
844		MAXIMUM_CAPACITY : tableSizeFor((int)size);
2567	–	this.counter = new LongAdder();
845		this.sizeCtl = cap;
846		}
847
848	<	/**
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	<	}
848	>	// Original (since JDK1.2) Map methods
849
850		/**
851		* {@inheritDoc}
852		*/
853		public int size() {
854	<	long n = counter.sum();
854	>	long n = sumCount();
855		return ((n < 0L) ? 0 :
856		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
857		(int)n);
858		}
859
860		/**
861	<	* 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
861	>	* {@inheritDoc}
862		*/
863	<	public long mappingCount() {
864	<	long n = counter.sum();
2625	<	return (n < 0L) ? 0L : n; // ignore transient negative values
863	>	public boolean isEmpty() {
864	>	return sumCount() <= 0L; // ignore transient negative values
865		}
866
867		/**
#	Line 2636 | Line 875 | public class ConcurrentHashMap<K, V>
875		*
876		* @throws NullPointerException if the specified key is null
877		*/
878	<	@SuppressWarnings("unchecked") public V get(Object key) {
879	<	if (key == null)
880	<	throw new NullPointerException();
881	<	return (V)internalGet(key);
882	<	}
883	<
884	<	/**
885	<	* Returns the value to which the specified key is mapped,
886	<	* or the given defaultValue if this map contains no mapping for the key.
887	<	*
888	<	* @param key the key
889	<	* @param defaultValue the value to return if this map contains
890	<	* no mapping for the given key
891	<	* @return the mapping for the key, if present; else the defaultValue
892	<	* @throws NullPointerException if the specified key is null
893	<	*/
894	<	@SuppressWarnings("unchecked") public V getValueOrDefault(Object key, V defaultValue) {
895	<	if (key == null)
2657	<	throw new NullPointerException();
2658	<	V v = (V) internalGet(key);
2659	<	return v == null ? defaultValue : v;
878	>	public V get(Object key) {
879	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
880	>	int h = spread(key.hashCode());
881	>	if ((tab = table) != null && (n = tab.length) > 0 &&
882	>	(e = tabAt(tab, (n - 1) & h)) != null) {
883	>	if ((eh = e.hash) == h) {
884	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
885	>	return e.val;
886	>	}
887	>	else if (eh < 0)
888	>	return (p = e.find(h, key)) != null ? p.val : null;
889	>	while ((e = e.next) != null) {
890	>	if (e.hash == h &&
891	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
892	>	return e.val;
893	>	}
894	>	}
895	>	return null;
896		}
897
898		/**
899		* Tests if the specified object is a key in this table.
900		*
901	<	* @param  key   possible key
901	>	* @param  key possible key
902		* @return {@code true} if and only if the specified object
903		*         is a key in this table, as determined by the
904		*         {@code equals} method; {@code false} otherwise
905		* @throws NullPointerException if the specified key is null
906		*/
907		public boolean containsKey(Object key) {
908	<	if (key == null)
2673	<	throw new NullPointerException();
2674	<	return internalGet(key) != null;
908	>	return get(key) != null;
909		}
910
911		/**
#	Line 2687 | Line 921 | public class ConcurrentHashMap<K, V>
921		public boolean containsValue(Object value) {
922		if (value == null)
923		throw new NullPointerException();
924	<	Object v;
925	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
926	<	while ((v = it.advance()) != null) {
927	<	if (v == value || value.equals(v))
928	<	return true;
924	>	Node<K,V>[] t;
925	>	if ((t = table) != null) {
926	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
927	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
928	>	V v;
929	>	if ((v = p.val) == value || (v != null && value.equals(v)))
930	>	return true;
931	>	}
932		}
933		return false;
934		}
935
936		/**
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	–	/**
937		* Maps the specified key to the specified value in this table.
938		* Neither the key nor the value can be null.
939		*
940	<	* <p> The value can be retrieved by calling the {@code get} method
940	>	* <p>The value can be retrieved by calling the {@code get} method
941		* with a key that is equal to the original key.
942		*
943		* @param key key with which the specified value is to be associated
#	Line 2728 | Line 946 | public class ConcurrentHashMap<K, V>
946		*         {@code null} if there was no mapping for {@code key}
947		* @throws NullPointerException if the specified key or value is null
948		*/
949	<	@SuppressWarnings("unchecked") public V put(K key, V value) {
950	<	if (key == null || value == null)
949	>	public V put(K key, V value) {
950	>	return putVal(key, value, false);
951	>	}
952	>
953	>	/** Implementation for put and putIfAbsent */
954	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
955	>	if (key == null || value == null) throw new NullPointerException();
956	>	int hash = spread(key.hashCode());
957	>	int binCount = 0;
958	>	for (Node<K,V>[] tab = table;;) {
959	>	Node<K,V> f; int n, i, fh;
960	>	if (tab == null || (n = tab.length) == 0)
961	>	tab = initTable();
962	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
963	>	if (casTabAt(tab, i, null,
964	>	new Node<K,V>(hash, key, value, null)))
965	>	break;                   // no lock when adding to empty bin
966	>	}
967	>	else if ((fh = f.hash) == MOVED)
968	>	tab = helpTransfer(tab, f);
969	>	else {
970	>	V oldVal = null;
971	>	synchronized (f) {
972	>	if (tabAt(tab, i) == f) {
973	>	if (fh >= 0) {
974	>	binCount = 1;
975	>	for (Node<K,V> e = f;; ++binCount) {
976	>	K ek;
977	>	if (e.hash == hash &&
978	>	((ek = e.key) == key ||
979	>	(ek != null && key.equals(ek)))) {
980	>	oldVal = e.val;
981	>	if (!onlyIfAbsent)
982	>	e.val = value;
983	>	break;
984	>	}
985	>	Node<K,V> pred = e;
986	>	if ((e = e.next) == null) {
987	>	pred.next = new Node<K,V>(hash, key,
988	>	value, null);
989	>	break;
990	>	}
991	>	}
992	>	}
993	>	else if (f instanceof TreeBin) {
994	>	Node<K,V> p;
995	>	binCount = 2;
996	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
997	>	value)) != null) {
998	>	oldVal = p.val;
999	>	if (!onlyIfAbsent)
1000	>	p.val = value;
1001	>	}
1002	>	}
1003	>	}
1004	>	}
1005	>	if (binCount != 0) {
1006	>	if (binCount >= TREEIFY_THRESHOLD)
1007	>	treeifyBin(tab, i);
1008	>	if (oldVal != null)
1009	>	return oldVal;
1010	>	break;
1011	>	}
1012	>	}
1013	>	}
1014	>	addCount(1L, binCount);
1015	>	return null;
1016	>	}
1017	>
1018	>	/**
1019	>	* Copies all of the mappings from the specified map to this one.
1020	>	* These mappings replace any mappings that this map had for any of the
1021	>	* keys currently in the specified map.
1022	>	*
1023	>	* @param m mappings to be stored in this map
1024	>	*/
1025	>	public void putAll(Map<? extends K, ? extends V> m) {
1026	>	tryPresize(m.size());
1027	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1028	>	putVal(e.getKey(), e.getValue(), false);
1029	>	}
1030	>
1031	>	/**
1032	>	* Removes the key (and its corresponding value) from this map.
1033	>	* This method does nothing if the key is not in the map.
1034	>	*
1035	>	* @param  key the key that needs to be removed
1036	>	* @return the previous value associated with {@code key}, or
1037	>	*         {@code null} if there was no mapping for {@code key}
1038	>	* @throws NullPointerException if the specified key is null
1039	>	*/
1040	>	public V remove(Object key) {
1041	>	return replaceNode(key, null, null);
1042	>	}
1043	>
1044	>	/**
1045	>	* Implementation for the four public remove/replace methods:
1046	>	* Replaces node value with v, conditional upon match of cv if
1047	>	* non-null.  If resulting value is null, delete.
1048	>	*/
1049	>	final V replaceNode(Object key, V value, Object cv) {
1050	>	int hash = spread(key.hashCode());
1051	>	for (Node<K,V>[] tab = table;;) {
1052	>	Node<K,V> f; int n, i, fh;
1053	>	if (tab == null || (n = tab.length) == 0 ||
1054	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1055	>	break;
1056	>	else if ((fh = f.hash) == MOVED)
1057	>	tab = helpTransfer(tab, f);
1058	>	else {
1059	>	V oldVal = null;
1060	>	boolean validated = false;
1061	>	synchronized (f) {
1062	>	if (tabAt(tab, i) == f) {
1063	>	if (fh >= 0) {
1064	>	validated = true;
1065	>	for (Node<K,V> e = f, pred = null;;) {
1066	>	K ek;
1067	>	if (e.hash == hash &&
1068	>	((ek = e.key) == key ||
1069	>	(ek != null && key.equals(ek)))) {
1070	>	V ev = e.val;
1071	>	if (cv == null || cv == ev ||
1072	>	(ev != null && cv.equals(ev))) {
1073	>	oldVal = ev;
1074	>	if (value != null)
1075	>	e.val = value;
1076	>	else if (pred != null)
1077	>	pred.next = e.next;
1078	>	else
1079	>	setTabAt(tab, i, e.next);
1080	>	}
1081	>	break;
1082	>	}
1083	>	pred = e;
1084	>	if ((e = e.next) == null)
1085	>	break;
1086	>	}
1087	>	}
1088	>	else if (f instanceof TreeBin) {
1089	>	validated = true;
1090	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1091	>	TreeNode<K,V> r, p;
1092	>	if ((r = t.root) != null &&
1093	>	(p = r.findTreeNode(hash, key, null)) != null) {
1094	>	V pv = p.val;
1095	>	if (cv == null || cv == pv ||
1096	>	(pv != null && cv.equals(pv))) {
1097	>	oldVal = pv;
1098	>	if (value != null)
1099	>	p.val = value;
1100	>	else if (t.removeTreeNode(p))
1101	>	setTabAt(tab, i, untreeify(t.first));
1102	>	}
1103	>	}
1104	>	}
1105	>	}
1106	>	}
1107	>	if (validated) {
1108	>	if (oldVal != null) {
1109	>	if (value == null)
1110	>	addCount(-1L, -1);
1111	>	return oldVal;
1112	>	}
1113	>	break;
1114	>	}
1115	>	}
1116	>	}
1117	>	return null;
1118	>	}
1119	>
1120	>	/**
1121	>	* Removes all of the mappings from this map.
1122	>	*/
1123	>	public void clear() {
1124	>	long delta = 0L; // negative number of deletions
1125	>	int i = 0;
1126	>	Node<K,V>[] tab = table;
1127	>	while (tab != null && i < tab.length) {
1128	>	int fh;
1129	>	Node<K,V> f = tabAt(tab, i);
1130	>	if (f == null)
1131	>	++i;
1132	>	else if ((fh = f.hash) == MOVED) {
1133	>	tab = helpTransfer(tab, f);
1134	>	i = 0; // restart
1135	>	}
1136	>	else {
1137	>	synchronized (f) {
1138	>	if (tabAt(tab, i) == f) {
1139	>	Node<K,V> p = (fh >= 0 ? f :
1140	>	(f instanceof TreeBin) ?
1141	>	((TreeBin<K,V>)f).first : null);
1142	>	while (p != null) {
1143	>	--delta;
1144	>	p = p.next;
1145	>	}
1146	>	setTabAt(tab, i++, null);
1147	>	}
1148	>	}
1149	>	}
1150	>	}
1151	>	if (delta != 0L)
1152	>	addCount(delta, -1);
1153	>	}
1154	>
1155	>	/**
1156	>	* Returns a {@link Set} view of the keys contained in this map.
1157	>	* The set is backed by the map, so changes to the map are
1158	>	* reflected in the set, and vice-versa. The set supports element
1159	>	* removal, which removes the corresponding mapping from this map,
1160	>	* via the {@code Iterator.remove}, {@code Set.remove},
1161	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1162	>	* operations.  It does not support the {@code add} or
1163	>	* {@code addAll} operations.
1164	>	*
1165	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1166	>	* that will never throw {@link ConcurrentModificationException},
1167	>	* and guarantees to traverse elements as they existed upon
1168	>	* construction of the iterator, and may (but is not guaranteed to)
1169	>	* reflect any modifications subsequent to construction.
1170	>	*
1171	>	* @return the set view
1172	>	*/
1173	>	public KeySetView<K,V> keySet() {
1174	>	KeySetView<K,V> ks;
1175	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1176	>	}
1177	>
1178	>	/**
1179	>	* Returns a {@link Collection} view of the values contained in this map.
1180	>	* The collection is backed by the map, so changes to the map are
1181	>	* reflected in the collection, and vice-versa.  The collection
1182	>	* supports element removal, which removes the corresponding
1183	>	* mapping from this map, via the {@code Iterator.remove},
1184	>	* {@code Collection.remove}, {@code removeAll},
1185	>	* {@code retainAll}, and {@code clear} operations.  It does not
1186	>	* support the {@code add} or {@code addAll} operations.
1187	>	*
1188	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1189	>	* that will never throw {@link ConcurrentModificationException},
1190	>	* and guarantees to traverse elements as they existed upon
1191	>	* construction of the iterator, and may (but is not guaranteed to)
1192	>	* reflect any modifications subsequent to construction.
1193	>	*
1194	>	* @return the collection view
1195	>	*/
1196	>	public Collection<V> values() {
1197	>	ValuesView<K,V> vs;
1198	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1199	>	}
1200	>
1201	>	/**
1202	>	* Returns a {@link Set} view of the mappings contained in this map.
1203	>	* The set is backed by the map, so changes to the map are
1204	>	* reflected in the set, and vice-versa.  The set supports element
1205	>	* removal, which removes the corresponding mapping from the map,
1206	>	* via the {@code Iterator.remove}, {@code Set.remove},
1207	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1208	>	* operations.
1209	>	*
1210	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1211	>	* that will never throw {@link ConcurrentModificationException},
1212	>	* and guarantees to traverse elements as they existed upon
1213	>	* construction of the iterator, and may (but is not guaranteed to)
1214	>	* reflect any modifications subsequent to construction.
1215	>	*
1216	>	* @return the set view
1217	>	*/
1218	>	public Set<Map.Entry<K,V>> entrySet() {
1219	>	EntrySetView<K,V> es;
1220	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1221	>	}
1222	>
1223	>	/**
1224	>	* Returns the hash code value for this {@link Map}, i.e.,
1225	>	* the sum of, for each key-value pair in the map,
1226	>	* {@code key.hashCode() ^ value.hashCode()}.
1227	>	*
1228	>	* @return the hash code value for this map
1229	>	*/
1230	>	public int hashCode() {
1231	>	int h = 0;
1232	>	Node<K,V>[] t;
1233	>	if ((t = table) != null) {
1234	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1235	>	for (Node<K,V> p; (p = it.advance()) != null; )
1236	>	h += p.key.hashCode() ^ p.val.hashCode();
1237	>	}
1238	>	return h;
1239	>	}
1240	>
1241	>	/**
1242	>	* Returns a string representation of this map.  The string
1243	>	* representation consists of a list of key-value mappings (in no
1244	>	* particular order) enclosed in braces ("{@code {}}").  Adjacent
1245	>	* mappings are separated by the characters {@code ", "} (comma
1246	>	* and space).  Each key-value mapping is rendered as the key
1247	>	* followed by an equals sign ("{@code =}") followed by the
1248	>	* associated value.
1249	>	*
1250	>	* @return a string representation of this map
1251	>	*/
1252	>	public String toString() {
1253	>	Node<K,V>[] t;
1254	>	int f = (t = table) == null ? 0 : t.length;
1255	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1256	>	StringBuilder sb = new StringBuilder();
1257	>	sb.append('{');
1258	>	Node<K,V> p;
1259	>	if ((p = it.advance()) != null) {
1260	>	for (;;) {
1261	>	K k = p.key;
1262	>	V v = p.val;
1263	>	sb.append(k == this ? "(this Map)" : k);
1264	>	sb.append('=');
1265	>	sb.append(v == this ? "(this Map)" : v);
1266	>	if ((p = it.advance()) == null)
1267	>	break;
1268	>	sb.append(',').append(' ');
1269	>	}
1270	>	}
1271	>	return sb.append('}').toString();
1272	>	}
1273	>
1274	>	/**
1275	>	* Compares the specified object with this map for equality.
1276	>	* Returns {@code true} if the given object is a map with the same
1277	>	* mappings as this map.  This operation may return misleading
1278	>	* results if either map is concurrently modified during execution
1279	>	* of this method.
1280	>	*
1281	>	* @param o object to be compared for equality with this map
1282	>	* @return {@code true} if the specified object is equal to this map
1283	>	*/
1284	>	public boolean equals(Object o) {
1285	>	if (o != this) {
1286	>	if (!(o instanceof Map))
1287	>	return false;
1288	>	Map<?,?> m = (Map<?,?>) o;
1289	>	Node<K,V>[] t;
1290	>	int f = (t = table) == null ? 0 : t.length;
1291	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1292	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1293	>	V val = p.val;
1294	>	Object v = m.get(p.key);
1295	>	if (v == null || (v != val && !v.equals(val)))
1296	>	return false;
1297	>	}
1298	>	for (Map.Entry<?,?> e : m.entrySet()) {
1299	>	Object mk, mv, v;
1300	>	if ((mk = e.getKey()) == null ||
1301	>	(mv = e.getValue()) == null ||
1302	>	(v = get(mk)) == null ||
1303	>	(mv != v && !mv.equals(v)))
1304	>	return false;
1305	>	}
1306	>	}
1307	>	return true;
1308	>	}
1309	>
1310	>	/**
1311	>	* Stripped-down version of helper class used in previous version,
1312	>	* declared for the sake of serialization compatibility
1313	>	*/
1314	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1315	>	private static final long serialVersionUID = 2249069246763182397L;
1316	>	final float loadFactor;
1317	>	Segment(float lf) { this.loadFactor = lf; }
1318	>	}
1319	>
1320	>	/**
1321	>	* Saves the state of the {@code ConcurrentHashMap} instance to a
1322	>	* stream (i.e., serializes it).
1323	>	* @param s the stream
1324	>	* @serialData
1325	>	* the key (Object) and value (Object)
1326	>	* for each key-value mapping, followed by a null pair.
1327	>	* The key-value mappings are emitted in no particular order.
1328	>	*/
1329	>	private void writeObject(java.io.ObjectOutputStream s)
1330	>	throws java.io.IOException {
1331	>	// For serialization compatibility
1332	>	// Emulate segment calculation from previous version of this class
1333	>	int sshift = 0;
1334	>	int ssize = 1;
1335	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1336	>	++sshift;
1337	>	ssize <<= 1;
1338	>	}
1339	>	int segmentShift = 32 - sshift;
1340	>	int segmentMask = ssize - 1;
1341	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1342	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1343	>	for (int i = 0; i < segments.length; ++i)
1344	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1345	>	s.putFields().put("segments", segments);
1346	>	s.putFields().put("segmentShift", segmentShift);
1347	>	s.putFields().put("segmentMask", segmentMask);
1348	>	s.writeFields();
1349	>
1350	>	Node<K,V>[] t;
1351	>	if ((t = table) != null) {
1352	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1353	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1354	>	s.writeObject(p.key);
1355	>	s.writeObject(p.val);
1356	>	}
1357	>	}
1358	>	s.writeObject(null);
1359	>	s.writeObject(null);
1360	>	segments = null; // throw away
1361	>	}
1362	>
1363	>	/**
1364	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1365	>	* @param s the stream
1366	>	*/
1367	>	private void readObject(java.io.ObjectInputStream s)
1368	>	throws java.io.IOException, ClassNotFoundException {
1369	>	/*
1370	>	* To improve performance in typical cases, we create nodes
1371	>	* while reading, then place in table once size is known.
1372	>	* However, we must also validate uniqueness and deal with
1373	>	* overpopulated bins while doing so, which requires
1374	>	* specialized versions of putVal mechanics.
1375	>	*/
1376	>	sizeCtl = -1; // force exclusion for table construction
1377	>	s.defaultReadObject();
1378	>	long size = 0L;
1379	>	Node<K,V> p = null;
1380	>	for (;;) {
1381	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1382	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1383	>	if (k != null && v != null) {
1384	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1385	>	++size;
1386	>	}
1387	>	else
1388	>	break;
1389	>	}
1390	>	if (size == 0L)
1391	>	sizeCtl = 0;
1392	>	else {
1393	>	int n;
1394	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1395	>	n = MAXIMUM_CAPACITY;
1396	>	else {
1397	>	int sz = (int)size;
1398	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1399	>	}
1400	>	@SuppressWarnings({"rawtypes","unchecked"})
1401	>	Node<K,V>[] tab = (Node<K,V>[])new Node[n];
1402	>	int mask = n - 1;
1403	>	long added = 0L;
1404	>	while (p != null) {
1405	>	boolean insertAtFront;
1406	>	Node<K,V> next = p.next, first;
1407	>	int h = p.hash, j = h & mask;
1408	>	if ((first = tabAt(tab, j)) == null)
1409	>	insertAtFront = true;
1410	>	else {
1411	>	K k = p.key;
1412	>	if (first.hash < 0) {
1413	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1414	>	if (t.putTreeVal(h, k, p.val) == null)
1415	>	++added;
1416	>	insertAtFront = false;
1417	>	}
1418	>	else {
1419	>	int binCount = 0;
1420	>	insertAtFront = true;
1421	>	Node<K,V> q; K qk;
1422	>	for (q = first; q != null; q = q.next) {
1423	>	if (q.hash == h &&
1424	>	((qk = q.key) == k ||
1425	>	(qk != null && k.equals(qk)))) {
1426	>	insertAtFront = false;
1427	>	break;
1428	>	}
1429	>	++binCount;
1430	>	}
1431	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1432	>	insertAtFront = false;
1433	>	++added;
1434	>	p.next = first;
1435	>	TreeNode<K,V> hd = null, tl = null;
1436	>	for (q = p; q != null; q = q.next) {
1437	>	TreeNode<K,V> t = new TreeNode<K,V>
1438	>	(q.hash, q.key, q.val, null, null);
1439	>	if ((t.prev = tl) == null)
1440	>	hd = t;
1441	>	else
1442	>	tl.next = t;
1443	>	tl = t;
1444	>	}
1445	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1446	>	}
1447	>	}
1448	>	}
1449	>	if (insertAtFront) {
1450	>	++added;
1451	>	p.next = first;
1452	>	setTabAt(tab, j, p);
1453	>	}
1454	>	p = next;
1455	>	}
1456	>	table = tab;
1457	>	sizeCtl = n - (n >>> 2);
1458	>	baseCount = added;
1459	>	}
1460	>	}
1461	>
1462	>	// ConcurrentMap methods
1463	>
1464	>	/**
1465	>	* {@inheritDoc}
1466	>	*
1467	>	* @return the previous value associated with the specified key,
1468	>	*         or {@code null} if there was no mapping for the key
1469	>	* @throws NullPointerException if the specified key or value is null
1470	>	*/
1471	>	public V putIfAbsent(K key, V value) {
1472	>	return putVal(key, value, true);
1473	>	}
1474	>
1475	>	/**
1476	>	* {@inheritDoc}
1477	>	*
1478	>	* @throws NullPointerException if the specified key is null
1479	>	*/
1480	>	public boolean remove(Object key, Object value) {
1481	>	if (key == null)
1482	>	throw new NullPointerException();
1483	>	return value != null && replaceNode(key, null, value) != null;
1484	>	}
1485	>
1486	>	/**
1487	>	* {@inheritDoc}
1488	>	*
1489	>	* @throws NullPointerException if any of the arguments are null
1490	>	*/
1491	>	public boolean replace(K key, V oldValue, V newValue) {
1492	>	if (key == null || oldValue == null || newValue == null)
1493		throw new NullPointerException();
1494	<	return (V)internalPut(key, value);
1494	>	return replaceNode(key, newValue, oldValue) != null;
1495		}
1496
1497		/**
#	Line 2741 | Line 1501 | public class ConcurrentHashMap<K, V>
1501		*         or {@code null} if there was no mapping for the key
1502		* @throws NullPointerException if the specified key or value is null
1503		*/
1504	<	@SuppressWarnings("unchecked") public V putIfAbsent(K key, V value) {
1504	>	public V replace(K key, V value) {
1505		if (key == null || value == null)
1506		throw new NullPointerException();
1507	<	return (V)internalPutIfAbsent(key, value);
1507	>	return replaceNode(key, value, null);
1508		}
1509
1510	+	// Overrides of JDK8+ Map extension method defaults
1511	+
1512		/**
1513	<	* Copies all of the mappings from the specified map to this one.
1514	<	* These mappings replace any mappings that this map had for any of the
1515	<	* keys currently in the specified map.
1513	>	* Returns the value to which the specified key is mapped, or the
1514	>	* given default value if this map contains no mapping for the
1515	>	* key.
1516		*
1517	<	* @param m mappings to be stored in this map
1517	>	* @param key the key whose associated value is to be returned
1518	>	* @param defaultValue the value to return if this map contains
1519	>	* no mapping for the given key
1520	>	* @return the mapping for the key, if present; else the default value
1521	>	* @throws NullPointerException if the specified key is null
1522		*/
1523	<	public void putAll(Map<? extends K, ? extends V> m) {
1524	<	internalPutAll(m);
1523	>	public V getOrDefault(Object key, V defaultValue) {
1524	>	V v;
1525	>	return (v = get(key)) == null ? defaultValue : v;
1526	>	}
1527	>
1528	>	public void forEach(BiConsumer<? super K, ? super V> action) {
1529	>	if (action == null) throw new NullPointerException();
1530	>	Node<K,V>[] t;
1531	>	if ((t = table) != null) {
1532	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1533	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1534	>	action.accept(p.key, p.val);
1535	>	}
1536	>	}
1537	>	}
1538	>
1539	>	public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {
1540	>	if (function == null) throw new NullPointerException();
1541	>	Node<K,V>[] t;
1542	>	if ((t = table) != null) {
1543	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1544	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1545	>	V oldValue = p.val;
1546	>	for (K key = p.key;;) {
1547	>	V newValue = function.apply(key, oldValue);
1548	>	if (newValue == null)
1549	>	throw new NullPointerException();
1550	>	if (replaceNode(key, newValue, oldValue) != null ||
1551	>	(oldValue = get(key)) == null)
1552	>	break;
1553	>	}
1554	>	}
1555	>	}
1556		}
1557
1558		/**
1559		* If the specified key is not already associated with a value,
1560	<	* computes its value using the given mappingFunction and enters
1561	<	* it into the map unless null.  This is equivalent to
1562	<	* <pre> {@code
1563	<	* if (map.containsKey(key))
1564	<	*   return map.get(key);
1565	<	* value = mappingFunction.apply(key);
1566	<	* 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>
1560	>	* attempts to compute its value using the given mapping function
1561	>	* and enters it into this map unless {@code null}.  The entire
1562	>	* method invocation is performed atomically, so the function is
1563	>	* applied at most once per key.  Some attempted update operations
1564	>	* on this map by other threads may be blocked while computation
1565	>	* is in progress, so the computation should be short and simple,
1566	>	* and must not attempt to update any other mappings of this map.
1567		*
1568		* @param key key with which the specified value is to be associated
1569		* @param mappingFunction the function to compute a value
#	Line 2797 | Line 1577 | public class ConcurrentHashMap<K, V>
1577		* @throws RuntimeException or Error if the mappingFunction does so,
1578		*         in which case the mapping is left unestablished
1579		*/
1580	<	@SuppressWarnings("unchecked") public V computeIfAbsent
2801	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
1580	>	public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
1581		if (key == null || mappingFunction == null)
1582		throw new NullPointerException();
1583	<	return (V)internalComputeIfAbsent(key, mappingFunction);
1583	>	int h = spread(key.hashCode());
1584	>	V val = null;
1585	>	int binCount = 0;
1586	>	for (Node<K,V>[] tab = table;;) {
1587	>	Node<K,V> f; int n, i, fh;
1588	>	if (tab == null || (n = tab.length) == 0)
1589	>	tab = initTable();
1590	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1591	>	Node<K,V> r = new ReservationNode<K,V>();
1592	>	synchronized (r) {
1593	>	if (casTabAt(tab, i, null, r)) {
1594	>	binCount = 1;
1595	>	Node<K,V> node = null;
1596	>	try {
1597	>	if ((val = mappingFunction.apply(key)) != null)
1598	>	node = new Node<K,V>(h, key, val, null);
1599	>	} finally {
1600	>	setTabAt(tab, i, node);
1601	>	}
1602	>	}
1603	>	}
1604	>	if (binCount != 0)
1605	>	break;
1606	>	}
1607	>	else if ((fh = f.hash) == MOVED)
1608	>	tab = helpTransfer(tab, f);
1609	>	else {
1610	>	boolean added = false;
1611	>	synchronized (f) {
1612	>	if (tabAt(tab, i) == f) {
1613	>	if (fh >= 0) {
1614	>	binCount = 1;
1615	>	for (Node<K,V> e = f;; ++binCount) {
1616	>	K ek; V ev;
1617	>	if (e.hash == h &&
1618	>	((ek = e.key) == key ||
1619	>	(ek != null && key.equals(ek)))) {
1620	>	val = e.val;
1621	>	break;
1622	>	}
1623	>	Node<K,V> pred = e;
1624	>	if ((e = e.next) == null) {
1625	>	if ((val = mappingFunction.apply(key)) != null) {
1626	>	added = true;
1627	>	pred.next = new Node<K,V>(h, key, val, null);
1628	>	}
1629	>	break;
1630	>	}
1631	>	}
1632	>	}
1633	>	else if (f instanceof TreeBin) {
1634	>	binCount = 2;
1635	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1636	>	TreeNode<K,V> r, p;
1637	>	if ((r = t.root) != null &&
1638	>	(p = r.findTreeNode(h, key, null)) != null)
1639	>	val = p.val;
1640	>	else if ((val = mappingFunction.apply(key)) != null) {
1641	>	added = true;
1642	>	t.putTreeVal(h, key, val);
1643	>	}
1644	>	}
1645	>	}
1646	>	}
1647	>	if (binCount != 0) {
1648	>	if (binCount >= TREEIFY_THRESHOLD)
1649	>	treeifyBin(tab, i);
1650	>	if (!added)
1651	>	return val;
1652	>	break;
1653	>	}
1654	>	}
1655	>	}
1656	>	if (val != null)
1657	>	addCount(1L, binCount);
1658	>	return val;
1659		}
1660
1661		/**
1662	<	* If the given key is present, computes a new mapping value given a key and
1663	<	* its current mapped value. This is equivalent to
1664	<	*  <pre> {@code
1665	<	*   if (map.containsKey(key)) {
1666	<	*     value = remappingFunction.apply(key, map.get(key));
1667	<	*     if (value != null)
1668	<	*       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:
1662	>	* If the value for the specified key is present, attempts to
1663	>	* compute a new mapping given the key and its current mapped
1664	>	* value.  The entire method invocation is performed atomically.
1665	>	* Some attempted update operations on this map by other threads
1666	>	* may be blocked while computation is in progress, so the
1667	>	* computation should be short and simple, and must not attempt to
1668	>	* update any other mappings of this map.
1669		*
1670	<	* @param key key with which the specified value is to be associated
1670	>	* @param key key with which a value may be associated
1671		* @param remappingFunction the function to compute a value
1672		* @return the new value associated with the specified key, or null if none
1673		* @throws NullPointerException if the specified key or remappingFunction
#	Line 2838 | Line 1678 | public class ConcurrentHashMap<K, V>
1678		* @throws RuntimeException or Error if the remappingFunction does so,
1679		*         in which case the mapping is unchanged
1680		*/
1681	<	@SuppressWarnings("unchecked") public V computeIfPresent
2842	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1681	>	public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
1682		if (key == null || remappingFunction == null)
1683		throw new NullPointerException();
1684	<	return (V)internalCompute(key, true, remappingFunction);
1684	>	int h = spread(key.hashCode());
1685	>	V val = null;
1686	>	int delta = 0;
1687	>	int binCount = 0;
1688	>	for (Node<K,V>[] tab = table;;) {
1689	>	Node<K,V> f; int n, i, fh;
1690	>	if (tab == null || (n = tab.length) == 0)
1691	>	tab = initTable();
1692	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1693	>	break;
1694	>	else if ((fh = f.hash) == MOVED)
1695	>	tab = helpTransfer(tab, f);
1696	>	else {
1697	>	synchronized (f) {
1698	>	if (tabAt(tab, i) == f) {
1699	>	if (fh >= 0) {
1700	>	binCount = 1;
1701	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1702	>	K ek;
1703	>	if (e.hash == h &&
1704	>	((ek = e.key) == key ||
1705	>	(ek != null && key.equals(ek)))) {
1706	>	val = remappingFunction.apply(key, e.val);
1707	>	if (val != null)
1708	>	e.val = val;
1709	>	else {
1710	>	delta = -1;
1711	>	Node<K,V> en = e.next;
1712	>	if (pred != null)
1713	>	pred.next = en;
1714	>	else
1715	>	setTabAt(tab, i, en);
1716	>	}
1717	>	break;
1718	>	}
1719	>	pred = e;
1720	>	if ((e = e.next) == null)
1721	>	break;
1722	>	}
1723	>	}
1724	>	else if (f instanceof TreeBin) {
1725	>	binCount = 2;
1726	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1727	>	TreeNode<K,V> r, p;
1728	>	if ((r = t.root) != null &&
1729	>	(p = r.findTreeNode(h, key, null)) != null) {
1730	>	val = remappingFunction.apply(key, p.val);
1731	>	if (val != null)
1732	>	p.val = val;
1733	>	else {
1734	>	delta = -1;
1735	>	if (t.removeTreeNode(p))
1736	>	setTabAt(tab, i, untreeify(t.first));
1737	>	}
1738	>	}
1739	>	}
1740	>	}
1741	>	}
1742	>	if (binCount != 0)
1743	>	break;
1744	>	}
1745	>	}
1746	>	if (delta != 0)
1747	>	addCount((long)delta, binCount);
1748	>	return val;
1749		}
1750
1751		/**
1752	<	* Computes a new mapping value given a key and
1753	<	* its current mapped value (or {@code null} if there is no current
1754	<	* mapping). This is equivalent to
1755	<	*  <pre> {@code
1756	<	*   value = remappingFunction.apply(key, map.get(key));
1757	<	*   if (value != null)
1758	<	*     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>
1752	>	* Attempts to compute a mapping for the specified key and its
1753	>	* current mapped value (or {@code null} if there is no current
1754	>	* mapping). The entire method invocation is performed atomically.
1755	>	* Some attempted update operations on this map by other threads
1756	>	* may be blocked while computation is in progress, so the
1757	>	* computation should be short and simple, and must not attempt to
1758	>	* update any other mappings of this Map.
1759		*
1760		* @param key key with which the specified value is to be associated
1761		* @param remappingFunction the function to compute a value
#	Line 2885 | Line 1768 | public class ConcurrentHashMap<K, V>
1768		* @throws RuntimeException or Error if the remappingFunction does so,
1769		*         in which case the mapping is unchanged
1770		*/
1771	<	@SuppressWarnings("unchecked") public V compute
1772	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1771	>	public V compute(K key,
1772	>	BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
1773		if (key == null || remappingFunction == null)
1774		throw new NullPointerException();
1775	<	return (V)internalCompute(key, false, remappingFunction);
1775	>	int h = spread(key.hashCode());
1776	>	V val = null;
1777	>	int delta = 0;
1778	>	int binCount = 0;
1779	>	for (Node<K,V>[] tab = table;;) {
1780	>	Node<K,V> f; int n, i, fh;
1781	>	if (tab == null || (n = tab.length) == 0)
1782	>	tab = initTable();
1783	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1784	>	Node<K,V> r = new ReservationNode<K,V>();
1785	>	synchronized (r) {
1786	>	if (casTabAt(tab, i, null, r)) {
1787	>	binCount = 1;
1788	>	Node<K,V> node = null;
1789	>	try {
1790	>	if ((val = remappingFunction.apply(key, null)) != null) {
1791	>	delta = 1;
1792	>	node = new Node<K,V>(h, key, val, null);
1793	>	}
1794	>	} finally {
1795	>	setTabAt(tab, i, node);
1796	>	}
1797	>	}
1798	>	}
1799	>	if (binCount != 0)
1800	>	break;
1801	>	}
1802	>	else if ((fh = f.hash) == MOVED)
1803	>	tab = helpTransfer(tab, f);
1804	>	else {
1805	>	synchronized (f) {
1806	>	if (tabAt(tab, i) == f) {
1807	>	if (fh >= 0) {
1808	>	binCount = 1;
1809	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1810	>	K ek;
1811	>	if (e.hash == h &&
1812	>	((ek = e.key) == key ||
1813	>	(ek != null && key.equals(ek)))) {
1814	>	val = remappingFunction.apply(key, e.val);
1815	>	if (val != null)
1816	>	e.val = val;
1817	>	else {
1818	>	delta = -1;
1819	>	Node<K,V> en = e.next;
1820	>	if (pred != null)
1821	>	pred.next = en;
1822	>	else
1823	>	setTabAt(tab, i, en);
1824	>	}
1825	>	break;
1826	>	}
1827	>	pred = e;
1828	>	if ((e = e.next) == null) {
1829	>	val = remappingFunction.apply(key, null);
1830	>	if (val != null) {
1831	>	delta = 1;
1832	>	pred.next =
1833	>	new Node<K,V>(h, key, val, null);
1834	>	}
1835	>	break;
1836	>	}
1837	>	}
1838	>	}
1839	>	else if (f instanceof TreeBin) {
1840	>	binCount = 1;
1841	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1842	>	TreeNode<K,V> r, p;
1843	>	if ((r = t.root) != null)
1844	>	p = r.findTreeNode(h, key, null);
1845	>	else
1846	>	p = null;
1847	>	V pv = (p == null) ? null : p.val;
1848	>	val = remappingFunction.apply(key, pv);
1849	>	if (val != null) {
1850	>	if (p != null)
1851	>	p.val = val;
1852	>	else {
1853	>	delta = 1;
1854	>	t.putTreeVal(h, key, val);
1855	>	}
1856	>	}
1857	>	else if (p != null) {
1858	>	delta = -1;
1859	>	if (t.removeTreeNode(p))
1860	>	setTabAt(tab, i, untreeify(t.first));
1861	>	}
1862	>	}
1863	>	}
1864	>	}
1865	>	if (binCount != 0) {
1866	>	if (binCount >= TREEIFY_THRESHOLD)
1867	>	treeifyBin(tab, i);
1868	>	break;
1869	>	}
1870	>	}
1871	>	}
1872	>	if (delta != 0)
1873	>	addCount((long)delta, binCount);
1874	>	return val;
1875		}
1876
1877		/**
1878	<	* If the specified key is not already associated
1879	<	* with a value, associate it with the given value.
1880	<	* Otherwise, replace the value with the results of
1881	<	* the given remapping function. This is equivalent to:
1882	<	*  <pre> {@code
1883	<	*   if (!map.containsKey(key))
1884	<	*     map.put(value);
1885	<	*   else {
1886	<	*     newValue = remappingFunction.apply(map.get(key), value);
1887	<	*     if (value != null)
1888	<	*       map.put(key, value);
1889	<	*     else
1890	<	*       map.remove(key);
1891	<	*   }
1892	<	* }</pre>
1893	<	* except that the action is performed atomically.  If the
1894	<	* function returns {@code null}, the mapping is removed.  If the
1895	<	* 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.
1878	>	* If the specified key is not already associated with a
1879	>	* (non-null) value, associates it with the given value.
1880	>	* Otherwise, replaces the value with the results of the given
1881	>	* remapping function, or removes if {@code null}. The entire
1882	>	* method invocation is performed atomically.  Some attempted
1883	>	* update operations on this map by other threads may be blocked
1884	>	* while computation is in progress, so the computation should be
1885	>	* short and simple, and must not attempt to update any other
1886	>	* mappings of this Map.
1887	>	*
1888	>	* @param key key with which the specified value is to be associated
1889	>	* @param value the value to use if absent
1890	>	* @param remappingFunction the function to recompute a value if present
1891	>	* @return the new value associated with the specified key, or null if none
1892	>	* @throws NullPointerException if the specified key or the
1893	>	*         remappingFunction is null
1894	>	* @throws RuntimeException or Error if the remappingFunction does so,
1895	>	*         in which case the mapping is unchanged
1896		*/
1897	<	@SuppressWarnings("unchecked") public V merge
2921	<	(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1897	>	public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
1898		if (key == null || value == null || remappingFunction == null)
1899		throw new NullPointerException();
1900	<	return (V)internalMerge(key, value, remappingFunction);
1900	>	int h = spread(key.hashCode());
1901	>	V val = null;
1902	>	int delta = 0;
1903	>	int binCount = 0;
1904	>	for (Node<K,V>[] tab = table;;) {
1905	>	Node<K,V> f; int n, i, fh;
1906	>	if (tab == null || (n = tab.length) == 0)
1907	>	tab = initTable();
1908	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1909	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1910	>	delta = 1;
1911	>	val = value;
1912	>	break;
1913	>	}
1914	>	}
1915	>	else if ((fh = f.hash) == MOVED)
1916	>	tab = helpTransfer(tab, f);
1917	>	else {
1918	>	synchronized (f) {
1919	>	if (tabAt(tab, i) == f) {
1920	>	if (fh >= 0) {
1921	>	binCount = 1;
1922	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1923	>	K ek;
1924	>	if (e.hash == h &&
1925	>	((ek = e.key) == key ||
1926	>	(ek != null && key.equals(ek)))) {
1927	>	val = remappingFunction.apply(e.val, value);
1928	>	if (val != null)
1929	>	e.val = val;
1930	>	else {
1931	>	delta = -1;
1932	>	Node<K,V> en = e.next;
1933	>	if (pred != null)
1934	>	pred.next = en;
1935	>	else
1936	>	setTabAt(tab, i, en);
1937	>	}
1938	>	break;
1939	>	}
1940	>	pred = e;
1941	>	if ((e = e.next) == null) {
1942	>	delta = 1;
1943	>	val = value;
1944	>	pred.next =
1945	>	new Node<K,V>(h, key, val, null);
1946	>	break;
1947	>	}
1948	>	}
1949	>	}
1950	>	else if (f instanceof TreeBin) {
1951	>	binCount = 2;
1952	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1953	>	TreeNode<K,V> r = t.root;
1954	>	TreeNode<K,V> p = (r == null) ? null :
1955	>	r.findTreeNode(h, key, null);
1956	>	val = (p == null) ? value :
1957	>	remappingFunction.apply(p.val, value);
1958	>	if (val != null) {
1959	>	if (p != null)
1960	>	p.val = val;
1961	>	else {
1962	>	delta = 1;
1963	>	t.putTreeVal(h, key, val);
1964	>	}
1965	>	}
1966	>	else if (p != null) {
1967	>	delta = -1;
1968	>	if (t.removeTreeNode(p))
1969	>	setTabAt(tab, i, untreeify(t.first));
1970	>	}
1971	>	}
1972	>	}
1973	>	}
1974	>	if (binCount != 0) {
1975	>	if (binCount >= TREEIFY_THRESHOLD)
1976	>	treeifyBin(tab, i);
1977	>	break;
1978	>	}
1979	>	}
1980	>	}
1981	>	if (delta != 0)
1982	>	addCount((long)delta, binCount);
1983	>	return val;
1984		}
1985
1986	+	// Hashtable legacy methods
1987	+
1988		/**
1989	<	* Removes the key (and its corresponding value) from this map.
1990	<	* This method does nothing if the key is not in the map.
1989	>	* Legacy method testing if some key maps into the specified value
1990	>	* in this table.  This method is identical in functionality to
1991	>	* {@link #containsValue(Object)}, and exists solely to ensure
1992	>	* full compatibility with class {@link java.util.Hashtable},
1993	>	* which supported this method prior to introduction of the
1994	>	* Java Collections framework.
1995		*
1996	<	* @param  key the key that needs to be removed
1997	<	* @return the previous value associated with {@code key}, or
1998	<	*         {@code null} if there was no mapping for {@code key}
1999	<	* @throws NullPointerException if the specified key is null
1996	>	* @param  value a value to search for
1997	>	* @return {@code true} if and only if some key maps to the
1998	>	*         {@code value} argument in this table as
1999	>	*         determined by the {@code equals} method;
2000	>	*         {@code false} otherwise
2001	>	* @throws NullPointerException if the specified value is null
2002		*/
2003	<	@SuppressWarnings("unchecked") public V remove(Object key) {
2004	<	if (key == null)
2938	<	throw new NullPointerException();
2939	<	return (V)internalReplace(key, null, null);
2003	>	@Deprecated public boolean contains(Object value) {
2004	>	return containsValue(value);
2005		}
2006
2007		/**
2008	<	* {@inheritDoc}
2008	>	* Returns an enumeration of the keys in this table.
2009		*
2010	<	* @throws NullPointerException if the specified key is null
2010	>	* @return an enumeration of the keys in this table
2011	>	* @see #keySet()
2012		*/
2013	<	public boolean remove(Object key, Object value) {
2014	<	if (key == null)
2015	<	throw new NullPointerException();
2016	<	if (value == null)
2951	<	return false;
2952	<	return internalReplace(key, null, value) != null;
2013	>	public Enumeration<K> keys() {
2014	>	Node<K,V>[] t;
2015	>	int f = (t = table) == null ? 0 : t.length;
2016	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2017		}
2018
2019		/**
2020	<	* {@inheritDoc}
2020	>	* Returns an enumeration of the values in this table.
2021		*
2022	<	* @throws NullPointerException if any of the arguments are null
2022	>	* @return an enumeration of the values in this table
2023	>	* @see #values()
2024		*/
2025	<	public boolean replace(K key, V oldValue, V newValue) {
2026	<	if (key == null || oldValue == null || newValue == null)
2027	<	throw new NullPointerException();
2028	<	return internalReplace(key, newValue, oldValue) != null;
2025	>	public Enumeration<V> elements() {
2026	>	Node<K,V>[] t;
2027	>	int f = (t = table) == null ? 0 : t.length;
2028	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2029		}
2030
2031	+	// ConcurrentHashMap-only methods
2032	+
2033		/**
2034	<	* {@inheritDoc}
2034	>	* Returns the number of mappings. This method should be used
2035	>	* instead of {@link #size} because a ConcurrentHashMap may
2036	>	* contain more mappings than can be represented as an int. The
2037	>	* value returned is an estimate; the actual count may differ if
2038	>	* there are concurrent insertions or removals.
2039		*
2040	<	* @return the previous value associated with the specified key,
2041	<	*         or {@code null} if there was no mapping for the key
2971	<	* @throws NullPointerException if the specified key or value is null
2040	>	* @return the number of mappings
2041	>	* @since 1.8
2042		*/
2043	<	@SuppressWarnings("unchecked") public V replace(K key, V value) {
2044	<	if (key == null || value == null)
2045	<	throw new NullPointerException();
2976	<	return (V)internalReplace(key, value, null);
2043	>	public long mappingCount() {
2044	>	long n = sumCount();
2045	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2046		}
2047
2048		/**
2049	<	* Removes all of the mappings from this map.
2049	>	* Creates a new {@link Set} backed by a ConcurrentHashMap
2050	>	* from the given type to {@code Boolean.TRUE}.
2051	>	*
2052	>	* @return the new set
2053	>	* @since 1.8
2054		*/
2055	<	public void clear() {
2056	<	internalClear();
2055	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2056	>	return new KeySetView<K,Boolean>
2057	>	(new ConcurrentHashMap<K,Boolean>(), Boolean.TRUE);
2058		}
2059
2060		/**
2061	<	* Returns a {@link Set} view of the keys contained in this map.
2062	<	* The set is backed by the map, so changes to the map are
2989	<	* reflected in the set, and vice-versa.
2061	>	* Creates a new {@link Set} backed by a ConcurrentHashMap
2062	>	* from the given type to {@code Boolean.TRUE}.
2063		*
2064	<	* @return the set view
2064	>	* @param initialCapacity The implementation performs internal
2065	>	* sizing to accommodate this many elements.
2066	>	* @throws IllegalArgumentException if the initial capacity of
2067	>	* elements is negative
2068	>	* @return the new set
2069	>	* @since 1.8
2070		*/
2071	<	public KeySetView<K,V> keySet() {
2072	<	KeySetView<K,V> ks = keySet;
2073	<	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2071	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2072	>	return new KeySetView<K,Boolean>
2073	>	(new ConcurrentHashMap<K,Boolean>(initialCapacity), Boolean.TRUE);
2074		}
2075
2076		/**
2077		* Returns a {@link Set} view of the keys in this map, using the
2078		* given common mapped value for any additions (i.e., {@link
2079	<	* Collection#add} and {@link Collection#addAll}). This is of
2080	<	* course only appropriate if it is acceptable to use the same
2081	<	* value for all additions from this view.
2079	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2080	>	* This is of course only appropriate if it is acceptable to use
2081	>	* the same value for all additions from this view.
2082		*
2083	<	* @param mappedValue the mapped value to use for any
3006	<	* additions.
2083	>	* @param mappedValue the mapped value to use for any additions
2084		* @return the set view
2085		* @throws NullPointerException if the mappedValue is null
2086		*/
#	Line 3013 | Line 2090 | public class ConcurrentHashMap<K, V>
2090		return new KeySetView<K,V>(this, mappedValue);
2091		}
2092
2093	+	/* ---------------- Special Nodes -------------- */
2094	+
2095		/**
2096	<	* 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.
2096	>	* A node inserted at head of bins during transfer operations.
2097		*/
2098	<	public ValuesView<K,V> values() {
2099	<	ValuesView<K,V> vs = values;
2100	<	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
2098	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2099	>	final Node<K,V>[] nextTable;
2100	>	ForwardingNode(Node<K,V>[] tab) {
2101	>	super(MOVED, null, null, null);
2102	>	this.nextTable = tab;
2103	>	}
2104	>
2105	>	Node<K,V> find(int h, Object k) {
2106	>	Node<K,V> e; int n;
2107	>	Node<K,V>[] tab = nextTable;
2108	>	if (k != null && tab != null && (n = tab.length) > 0 &&
2109	>	(e = tabAt(tab, (n - 1) & h)) != null) {
2110	>	do {
2111	>	int eh; K ek;
2112	>	if ((eh = e.hash) == h &&
2113	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2114	>	return e;
2115	>	if (eh < 0)
2116	>	return e.find(h, k);
2117	>	} while ((e = e.next) != null);
2118	>	}
2119	>	return null;
2120	>	}
2121		}
2122
2123		/**
2124	<	* 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.
2124	>	* A place-holder node used in computeIfAbsent and compute
2125		*/
2126	<	public Set<Map.Entry<K,V>> entrySet() {
2127	<	EntrySetView<K,V> es = entrySet;
2128	<	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
2126	>	static final class ReservationNode<K,V> extends Node<K,V> {
2127	>	ReservationNode() {
2128	>	super(RESERVED, null, null, null);
2129	>	}
2130	>
2131	>	Node<K,V> find(int h, Object k) {
2132	>	return null;
2133	>	}
2134		}
2135
2136	+	/* ---------------- Table Initialization and Resizing -------------- */
2137	+
2138		/**
2139	<	* Returns an enumeration of the keys in this table.
3049	<	*
3050	<	* @return an enumeration of the keys in this table
3051	<	* @see #keySet()
2139	>	* Initializes table, using the size recorded in sizeCtl.
2140		*/
2141	<	public Enumeration<K> keys() {
2142	<	return new KeyIterator<K,V>(this);
2141	>	private final Node<K,V>[] initTable() {
2142	>	Node<K,V>[] tab; int sc;
2143	>	while ((tab = table) == null || tab.length == 0) {
2144	>	if ((sc = sizeCtl) < 0)
2145	>	Thread.yield(); // lost initialization race; just spin
2146	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2147	>	try {
2148	>	if ((tab = table) == null || tab.length == 0) {
2149	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2150	>	@SuppressWarnings({"rawtypes","unchecked"})
2151	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n];
2152	>	table = tab = nt;
2153	>	sc = n - (n >>> 2);
2154	>	}
2155	>	} finally {
2156	>	sizeCtl = sc;
2157	>	}
2158	>	break;
2159	>	}
2160	>	}
2161	>	return tab;
2162		}
2163
2164		/**
2165	<	* Returns an enumeration of the values in this table.
2166	<	*
2167	<	* @return an enumeration of the values in this table
2168	<	* @see #values()
2165	>	* Adds to count, and if table is too small and not already
2166	>	* resizing, initiates transfer. If already resizing, helps
2167	>	* perform transfer if work is available.  Rechecks occupancy
2168	>	* after a transfer to see if another resize is already needed
2169	>	* because resizings are lagging additions.
2170	>	*
2171	>	* @param x the count to add
2172	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
2173	>	*/
2174	>	private final void addCount(long x, int check) {
2175	>	CounterCell[] as; long b, s;
2176	>	if ((as = counterCells) != null ||
2177	>	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2178	>	CounterCell a; long v; int m;
2179	>	boolean uncontended = true;
2180	>	if (as == null || (m = as.length - 1) < 0 ||
2181	>	(a = as[ThreadLocalRandom.getProbe() & m]) == null ||
2182	>	!(uncontended =
2183	>	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
2184	>	fullAddCount(x, uncontended);
2185	>	return;
2186	>	}
2187	>	if (check <= 1)
2188	>	return;
2189	>	s = sumCount();
2190	>	}
2191	>	if (check >= 0) {
2192	>	Node<K,V>[] tab, nt; int sc;
2193	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2194	>	tab.length < MAXIMUM_CAPACITY) {
2195	>	if (sc < 0) {
2196	>	if (sc == -1 || transferIndex <= transferOrigin ||
2197	>	(nt = nextTable) == null)
2198	>	break;
2199	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2200	>	transfer(tab, nt);
2201	>	}
2202	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -2))
2203	>	transfer(tab, null);
2204	>	s = sumCount();
2205	>	}
2206	>	}
2207	>	}
2208	>
2209	>	/**
2210	>	* Helps transfer if a resize is in progress.
2211		*/
2212	<	public Enumeration<V> elements() {
2213	<	return new ValueIterator<K,V>(this);
2212	>	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2213	>	Node<K,V>[] nextTab; int sc;
2214	>	if ((f instanceof ForwardingNode) &&
2215	>	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2216	>	if (nextTab == nextTable && tab == table &&
2217	>	transferIndex > transferOrigin && (sc = sizeCtl) < -1 &&
2218	>	U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2219	>	transfer(tab, nextTab);
2220	>	return nextTab;
2221	>	}
2222	>	return table;
2223		}
2224
2225		/**
2226	<	* Returns a partitionable iterator of the keys in this map.
2226	>	* Tries to presize table to accommodate the given number of elements.
2227		*
2228	<	* @return a partitionable iterator of the keys in this map
2228	>	* @param size number of elements (doesn't need to be perfectly accurate)
2229		*/
2230	<	public Spliterator<K> keySpliterator() {
2231	<	return new KeyIterator<K,V>(this);
2230	>	private final void tryPresize(int size) {
2231	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2232	>	tableSizeFor(size + (size >>> 1) + 1);
2233	>	int sc;
2234	>	while ((sc = sizeCtl) >= 0) {
2235	>	Node<K,V>[] tab = table; int n;
2236	>	if (tab == null || (n = tab.length) == 0) {
2237	>	n = (sc > c) ? sc : c;
2238	>	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2239	>	try {
2240	>	if (table == tab) {
2241	>	@SuppressWarnings({"rawtypes","unchecked"})
2242	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n];
2243	>	table = nt;
2244	>	sc = n - (n >>> 2);
2245	>	}
2246	>	} finally {
2247	>	sizeCtl = sc;
2248	>	}
2249	>	}
2250	>	}
2251	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2252	>	break;
2253	>	else if (tab == table &&
2254	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2255	>	transfer(tab, null);
2256	>	}
2257		}
2258
2259		/**
2260	<	* Returns a partitionable iterator of the values in this map.
2261	<	*
3079	<	* @return a partitionable iterator of the values in this map
2260	>	* Moves and/or copies the nodes in each bin to new table. See
2261	>	* above for explanation.
2262		*/
2263	<	public Spliterator<V> valueSpliterator() {
2264	<	return new ValueIterator<K,V>(this);
2263	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2264	>	int n = tab.length, stride;
2265	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2266	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
2267	>	if (nextTab == null) {            // initiating
2268	>	try {
2269	>	@SuppressWarnings({"rawtypes","unchecked"})
2270	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n << 1];
2271	>	nextTab = nt;
2272	>	} catch (Throwable ex) {      // try to cope with OOME
2273	>	sizeCtl = Integer.MAX_VALUE;
2274	>	return;
2275	>	}
2276	>	nextTable = nextTab;
2277	>	transferOrigin = n;
2278	>	transferIndex = n;
2279	>	ForwardingNode<K,V> rev = new ForwardingNode<K,V>(tab);
2280	>	for (int k = n; k > 0;) {    // progressively reveal ready slots
2281	>	int nextk = (k > stride) ? k - stride : 0;
2282	>	for (int m = nextk; m < k; ++m)
2283	>	nextTab[m] = rev;
2284	>	for (int m = n + nextk; m < n + k; ++m)
2285	>	nextTab[m] = rev;
2286	>	U.putOrderedInt(this, TRANSFERORIGIN, k = nextk);
2287	>	}
2288	>	}
2289	>	int nextn = nextTab.length;
2290	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2291	>	boolean advance = true;
2292	>	for (int i = 0, bound = 0;;) {
2293	>	int nextIndex, nextBound, fh; Node<K,V> f;
2294	>	while (advance) {
2295	>	if (--i >= bound)
2296	>	advance = false;
2297	>	else if ((nextIndex = transferIndex) <= transferOrigin) {
2298	>	i = -1;
2299	>	advance = false;
2300	>	}
2301	>	else if (U.compareAndSwapInt
2302	>	(this, TRANSFERINDEX, nextIndex,
2303	>	nextBound = (nextIndex > stride ?
2304	>	nextIndex - stride : 0))) {
2305	>	bound = nextBound;
2306	>	i = nextIndex - 1;
2307	>	advance = false;
2308	>	}
2309	>	}
2310	>	if (i < 0 || i >= n || i + n >= nextn) {
2311	>	for (int sc;;) {
2312	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, ++sc)) {
2313	>	if (sc == -1) {
2314	>	nextTable = null;
2315	>	table = nextTab;
2316	>	sizeCtl = (n << 1) - (n >>> 1);
2317	>	}
2318	>	return;
2319	>	}
2320	>	}
2321	>	}
2322	>	else if ((f = tabAt(tab, i)) == null) {
2323	>	if (casTabAt(tab, i, null, fwd)) {
2324	>	setTabAt(nextTab, i, null);
2325	>	setTabAt(nextTab, i + n, null);
2326	>	advance = true;
2327	>	}
2328	>	}
2329	>	else if ((fh = f.hash) == MOVED)
2330	>	advance = true; // already processed
2331	>	else {
2332	>	synchronized (f) {
2333	>	if (tabAt(tab, i) == f) {
2334	>	Node<K,V> ln, hn;
2335	>	if (fh >= 0) {
2336	>	int runBit = fh & n;
2337	>	Node<K,V> lastRun = f;
2338	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2339	>	int b = p.hash & n;
2340	>	if (b != runBit) {
2341	>	runBit = b;
2342	>	lastRun = p;
2343	>	}
2344	>	}
2345	>	if (runBit == 0) {
2346	>	ln = lastRun;
2347	>	hn = null;
2348	>	}
2349	>	else {
2350	>	hn = lastRun;
2351	>	ln = null;
2352	>	}
2353	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2354	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2355	>	if ((ph & n) == 0)
2356	>	ln = new Node<K,V>(ph, pk, pv, ln);
2357	>	else
2358	>	hn = new Node<K,V>(ph, pk, pv, hn);
2359	>	}
2360	>	}
2361	>	else if (f instanceof TreeBin) {
2362	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2363	>	TreeNode<K,V> lo = null, loTail = null;
2364	>	TreeNode<K,V> hi = null, hiTail = null;
2365	>	int lc = 0, hc = 0;
2366	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2367	>	int h = e.hash;
2368	>	TreeNode<K,V> p = new TreeNode<K,V>
2369	>	(h, e.key, e.val, null, null);
2370	>	if ((h & n) == 0) {
2371	>	if ((p.prev = loTail) == null)
2372	>	lo = p;
2373	>	else
2374	>	loTail.next = p;
2375	>	loTail = p;
2376	>	++lc;
2377	>	}
2378	>	else {
2379	>	if ((p.prev = hiTail) == null)
2380	>	hi = p;
2381	>	else
2382	>	hiTail.next = p;
2383	>	hiTail = p;
2384	>	++hc;
2385	>	}
2386	>	}
2387	>	ln = (lc <= UNTREEIFY_THRESHOLD ?  untreeify(lo) :
2388	>	(hc != 0) ? new TreeBin<K,V>(lo) : t);
2389	>	hn = (hc <= UNTREEIFY_THRESHOLD ? untreeify(hi) :
2390	>	(lc != 0) ? new TreeBin<K,V>(hi) : t);
2391	>	}
2392	>	else
2393	>	ln = hn = null;
2394	>	setTabAt(nextTab, i, ln);
2395	>	setTabAt(nextTab, i + n, hn);
2396	>	setTabAt(tab, i, fwd);
2397	>	advance = true;
2398	>	}
2399	>	}
2400	>	}
2401	>	}
2402		}
2403
2404	+	/* ---------------- Counter support -------------- */
2405	+
2406		/**
2407	<	* Returns a partitionable iterator of the entries in this map.
2408	<	*
3088	<	* @return a partitionable iterator of the entries in this map
2407	>	* A padded cell for distributing counts.  Adapted from LongAdder
2408	>	* and Striped64.  See their internal docs for explanation.
2409		*/
2410	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2411	<	return new EntryIterator<K,V>(this);
2410	>	@sun.misc.Contended static final class CounterCell {
2411	>	volatile long value;
2412	>	CounterCell(long x) { value = x; }
2413	>	}
2414	>
2415	>	final long sumCount() {
2416	>	CounterCell[] as = counterCells; CounterCell a;
2417	>	long sum = baseCount;
2418	>	if (as != null) {
2419	>	for (int i = 0; i < as.length; ++i) {
2420	>	if ((a = as[i]) != null)
2421	>	sum += a.value;
2422	>	}
2423	>	}
2424	>	return sum;
2425		}
2426
2427	+	// See LongAdder version for explanation
2428	+	private final void fullAddCount(long x, boolean wasUncontended) {
2429	+	int h;
2430	+	if ((h = ThreadLocalRandom.getProbe()) == 0) {
2431	+	ThreadLocalRandom.localInit();      // force initialization
2432	+	h = ThreadLocalRandom.getProbe();
2433	+	wasUncontended = true;
2434	+	}
2435	+	boolean collide = false;                // True if last slot nonempty
2436	+	for (;;) {
2437	+	CounterCell[] as; CounterCell a; int n; long v;
2438	+	if ((as = counterCells) != null && (n = as.length) > 0) {
2439	+	if ((a = as[(n - 1) & h]) == null) {
2440	+	if (cellsBusy == 0) {            // Try to attach new Cell
2441	+	CounterCell r = new CounterCell(x); // Optimistic create
2442	+	if (cellsBusy == 0 &&
2443	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
2444	+	boolean created = false;
2445	+	try {               // Recheck under lock
2446	+	CounterCell[] rs; int m, j;
2447	+	if ((rs = counterCells) != null &&
2448	+	(m = rs.length) > 0 &&
2449	+	rs[j = (m - 1) & h] == null) {
2450	+	rs[j] = r;
2451	+	created = true;
2452	+	}
2453	+	} finally {
2454	+	cellsBusy = 0;
2455	+	}
2456	+	if (created)
2457	+	break;
2458	+	continue;           // Slot is now non-empty
2459	+	}
2460	+	}
2461	+	collide = false;
2462	+	}
2463	+	else if (!wasUncontended)       // CAS already known to fail
2464	+	wasUncontended = true;      // Continue after rehash
2465	+	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
2466	+	break;
2467	+	else if (counterCells != as || n >= NCPU)
2468	+	collide = false;            // At max size or stale
2469	+	else if (!collide)
2470	+	collide = true;
2471	+	else if (cellsBusy == 0 &&
2472	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
2473	+	try {
2474	+	if (counterCells == as) {// Expand table unless stale
2475	+	CounterCell[] rs = new CounterCell[n << 1];
2476	+	for (int i = 0; i < n; ++i)
2477	+	rs[i] = as[i];
2478	+	counterCells = rs;
2479	+	}
2480	+	} finally {
2481	+	cellsBusy = 0;
2482	+	}
2483	+	collide = false;
2484	+	continue;                   // Retry with expanded table
2485	+	}
2486	+	h = ThreadLocalRandom.advanceProbe(h);
2487	+	}
2488	+	else if (cellsBusy == 0 && counterCells == as &&
2489	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
2490	+	boolean init = false;
2491	+	try {                           // Initialize table
2492	+	if (counterCells == as) {
2493	+	CounterCell[] rs = new CounterCell[2];
2494	+	rs[h & 1] = new CounterCell(x);
2495	+	counterCells = rs;
2496	+	init = true;
2497	+	}
2498	+	} finally {
2499	+	cellsBusy = 0;
2500	+	}
2501	+	if (init)
2502	+	break;
2503	+	}
2504	+	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
2505	+	break;                          // Fall back on using base
2506	+	}
2507	+	}
2508	+
2509	+	/* ---------------- Conversion from/to TreeBins -------------- */
2510	+
2511		/**
2512	<	* Returns the hash code value for this {@link Map}, i.e.,
2513	<	* the sum of, for each key-value pair in the map,
2514	<	* {@code key.hashCode() ^ value.hashCode()}.
2515	<	*
2516	<	* @return the hash code value for this map
2512	>	* Replaces all linked nodes in bin at given index unless table is
2513	>	* too small, in which case resizes instead.
2514	>	*/
2515	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2516	>	Node<K,V> b; int n, sc;
2517	>	if (tab != null) {
2518	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY) {
2519	>	if (tab == table && (sc = sizeCtl) >= 0 &&
2520	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2521	>	transfer(tab, null);
2522	>	}
2523	>	else if ((b = tabAt(tab, index)) != null) {
2524	>	synchronized (b) {
2525	>	if (tabAt(tab, index) == b) {
2526	>	TreeNode<K,V> hd = null, tl = null;
2527	>	for (Node<K,V> e = b; e != null; e = e.next) {
2528	>	TreeNode<K,V> p =
2529	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2530	>	null, null);
2531	>	if ((p.prev = tl) == null)
2532	>	hd = p;
2533	>	else
2534	>	tl.next = p;
2535	>	tl = p;
2536	>	}
2537	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2538	>	}
2539	>	}
2540	>	}
2541	>	}
2542	>	}
2543	>
2544	>	/**
2545	>	* Returns a list on non-TreeNodes replacing those in given list
2546		*/
2547	<	public int hashCode() {
2548	<	int h = 0;
2549	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2550	<	Object v;
2551	<	while ((v = it.advance()) != null) {
2552	<	h += it.nextKey.hashCode() ^ v.hashCode();
2547	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2548	>	Node<K,V> hd = null, tl = null;
2549	>	for (Node<K,V> q = b; q != null; q = q.next) {
2550	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2551	>	if (tl == null)
2552	>	hd = p;
2553	>	else
2554	>	tl.next = p;
2555	>	tl = p;
2556		}
2557	<	return h;
2557	>	return hd;
2558		}
2559
2560	+	/* ---------------- TreeNodes -------------- */
2561	+
2562		/**
2563	<	* 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
2563	>	* Nodes for use in TreeBins
2564		*/
2565	<	public String toString() {
2566	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2567	<	StringBuilder sb = new StringBuilder();
2568	<	sb.append('{');
2569	<	Object v;
2570	<	if ((v = it.advance()) != null) {
2571	<	for (;;) {
2572	<	Object k = it.nextKey;
2573	<	sb.append(k == this ? "(this Map)" : k);
2574	<	sb.append('=');
2575	<	sb.append(v == this ? "(this Map)" : v);
2576	<	if ((v = it.advance()) == null)
2565	>	static final class TreeNode<K,V> extends Node<K,V> {
2566	>	TreeNode<K,V> parent;  // red-black tree links
2567	>	TreeNode<K,V> left;
2568	>	TreeNode<K,V> right;
2569	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2570	>	boolean red;
2571	>
2572	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2573	>	TreeNode<K,V> parent) {
2574	>	super(hash, key, val, next);
2575	>	this.parent = parent;
2576	>	}
2577	>
2578	>	Node<K,V> find(int h, Object k) {
2579	>	return findTreeNode(h, k, null);
2580	>	}
2581	>
2582	>	/**
2583	>	* Returns the TreeNode (or null if not found) for the given key
2584	>	* starting at given root.
2585	>	*/
2586	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2587	>	if (k != null) {
2588	>	TreeNode<K,V> p = this;
2589	>	do  {
2590	>	int ph, dir; K pk; TreeNode<K,V> q;
2591	>	TreeNode<K,V> pl = p.left, pr = p.right;
2592	>	if ((ph = p.hash) > h)
2593	>	p = pl;
2594	>	else if (ph < h)
2595	>	p = pr;
2596	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2597	>	return p;
2598	>	else if (pl == null && pr == null)
2599	>	break;
2600	>	else if ((kc != null ||
2601	>	(kc = comparableClassFor(k)) != null) &&
2602	>	(dir = compareComparables(kc, k, pk)) != 0)
2603	>	p = (dir < 0) ? pl : pr;
2604	>	else if (pl == null)
2605	>	p = pr;
2606	>	else if (pr == null ||
2607	>	(q = pr.findTreeNode(h, k, kc)) == null)
2608	>	p = pl;
2609	>	else
2610	>	return q;
2611	>	} while (p != null);
2612	>	}
2613	>	return null;
2614	>	}
2615	>	}
2616	>
2617	>	/* ---------------- TreeBins -------------- */
2618	>
2619	>	/**
2620	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2621	>	* keys or values, but instead point to list of TreeNodes and
2622	>	* their root. They also maintain a parasitic read-write lock
2623	>	* forcing writers (who hold bin lock) to wait for readers (who do
2624	>	* not) to complete before tree restructuring operations.
2625	>	*/
2626	>	static final class TreeBin<K,V> extends Node<K,V> {
2627	>	TreeNode<K,V> root;
2628	>	volatile TreeNode<K,V> first;
2629	>	volatile Thread waiter;
2630	>	volatile int lockState;
2631	>	// values for lockState
2632	>	static final int WRITER = 1; // set while holding write lock
2633	>	static final int WAITER = 2; // set when waiting for write lock
2634	>	static final int READER = 4; // increment value for setting read lock
2635	>
2636	>	/**
2637	>	* Creates bin with initial set of nodes headed by b.
2638	>	*/
2639	>	TreeBin(TreeNode<K,V> b) {
2640	>	super(TREEBIN, null, null, null);
2641	>	this.first = b;
2642	>	TreeNode<K,V> r = null;
2643	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2644	>	next = (TreeNode<K,V>)x.next;
2645	>	x.left = x.right = null;
2646	>	if (r == null) {
2647	>	x.parent = null;
2648	>	x.red = false;
2649	>	r = x;
2650	>	}
2651	>	else {
2652	>	Object key = x.key;
2653	>	int hash = x.hash;
2654	>	Class<?> kc = null;
2655	>	for (TreeNode<K,V> p = r;;) {
2656	>	int dir, ph;
2657	>	if ((ph = p.hash) > hash)
2658	>	dir = -1;
2659	>	else if (ph < hash)
2660	>	dir = 1;
2661	>	else if ((kc != null ||
2662	>	(kc = comparableClassFor(key)) != null))
2663	>	dir = compareComparables(kc, key, p.key);
2664	>	else
2665	>	dir = 0;
2666	>	TreeNode<K,V> xp = p;
2667	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2668	>	x.parent = xp;
2669	>	if (dir <= 0)
2670	>	xp.left = x;
2671	>	else
2672	>	xp.right = x;
2673	>	r = balanceInsertion(r, x);
2674	>	break;
2675	>	}
2676	>	}
2677	>	}
2678	>	}
2679	>	this.root = r;
2680	>	}
2681	>
2682	>	/**
2683	>	* Acquires write lock for tree restructuring
2684	>	*/
2685	>	private final void lockRoot() {
2686	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2687	>	contendedLock(); // offload to separate method
2688	>	}
2689	>
2690	>	/**
2691	>	* Releases write lock for tree restructuring
2692	>	*/
2693	>	private final void unlockRoot() {
2694	>	lockState = 0;
2695	>	}
2696	>
2697	>	/**
2698	>	* Possibly blocks awaiting root lock
2699	>	*/
2700	>	private final void contendedLock() {
2701	>	boolean waiting = false;
2702	>	for (int s;;) {
2703	>	if (((s = lockState) & WRITER) == 0) {
2704	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2705	>	if (waiting)
2706	>	waiter = null;
2707	>	return;
2708	>	}
2709	>	}
2710	>	else if ((s | WAITER) == 0) {
2711	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2712	>	waiting = true;
2713	>	waiter = Thread.currentThread();
2714	>	}
2715	>	}
2716	>	else if (waiting)
2717	>	LockSupport.park(this);
2718	>	}
2719	>	}
2720	>
2721	>	/**
2722	>	* Returns matching node or null if none. Tries to search
2723	>	* using tree compareisons from root, but continues linear
2724	>	* search when lock not available.
2725	>	*/
2726	>	final Node<K,V> find(int h, Object k) {
2727	>	if (k != null) {
2728	>	for (Node<K,V> e = first; e != null; e = e.next) {
2729	>	int s; K ek;
2730	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2731	>	if (e.hash == h &&
2732	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2733	>	return e;
2734	>	}
2735	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2736	>	s + READER)) {
2737	>	TreeNode<K,V> r, p;
2738	>	try {
2739	>	p = ((r = root) == null ? null :
2740	>	r.findTreeNode(h, k, null));
2741	>	} finally {
2742	>	Thread w;
2743	>	if (U.getAndAddInt(this, LOCKSTATE, -READER) ==
2744	>	(READER|WAITER) && (w = waiter) != null)
2745	>	LockSupport.unpark(w);
2746	>	}
2747	>	return p;
2748	>	}
2749	>	}
2750	>	}
2751	>	return null;
2752	>	}
2753	>
2754	>	/**
2755	>	* Finds or adds a node.
2756	>	* @return null if added
2757	>	*/
2758	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2759	>	Class<?> kc = null;
2760	>	for (TreeNode<K,V> p = root;;) {
2761	>	int dir, ph; K pk; TreeNode<K,V> q, pr;
2762	>	if (p == null) {
2763	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2764		break;
2765	<	sb.append(',').append(' ');
2765	>	}
2766	>	else if ((ph = p.hash) > h)
2767	>	dir = -1;
2768	>	else if (ph < h)
2769	>	dir = 1;
2770	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2771	>	return p;
2772	>	else if ((kc == null &&
2773	>	(kc = comparableClassFor(k)) == null) ||
2774	>	(dir = compareComparables(kc, k, pk)) == 0) {
2775	>	if (p.left == null)
2776	>	dir = 1;
2777	>	else if ((pr = p.right) == null ||
2778	>	(q = pr.findTreeNode(h, k, kc)) == null)
2779	>	dir = -1;
2780	>	else
2781	>	return q;
2782	>	}
2783	>	TreeNode<K,V> xp = p;
2784	>	if ((p = (dir < 0) ? p.left : p.right) == null) {
2785	>	TreeNode<K,V> x, f = first;
2786	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2787	>	if (f != null)
2788	>	f.prev = x;
2789	>	if (dir < 0)
2790	>	xp.left = x;
2791	>	else
2792	>	xp.right = x;
2793	>	if (!xp.red)
2794	>	x.red = true;
2795	>	else {
2796	>	lockRoot();
2797	>	try {
2798	>	root = balanceInsertion(root, x);
2799	>	} finally {
2800	>	unlockRoot();
2801	>	}
2802	>	}
2803	>	break;
2804	>	}
2805	>	}
2806	>	assert checkInvariants(root);
2807	>	return null;
2808	>	}
2809	>
2810	>	/**
2811	>	* Removes the given node, that must be present before this
2812	>	* call.  This is messier than typical red-black deletion code
2813	>	* because we cannot swap the contents of an interior node
2814	>	* with a leaf successor that is pinned by "next" pointers
2815	>	* that are accessible independently of lock. So instead we
2816	>	* swap the tree linkages.
2817	>	*
2818	>	* @return true if now too small so should be untreeified.
2819	>	*/
2820	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2821	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2822	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2823	>	TreeNode<K,V> r, rl;
2824	>	if (pred == null)
2825	>	first = next;
2826	>	else
2827	>	pred.next = next;
2828	>	if (next != null)
2829	>	next.prev = pred;
2830	>	if (first == null) {
2831	>	root = null;
2832	>	return true;
2833	>	}
2834	>	if ((r = root) == null || r.right == null || // too small
2835	>	(rl = r.left) == null || rl.left == null)
2836	>	return true;
2837	>	lockRoot();
2838	>	try {
2839	>	TreeNode<K,V> replacement;
2840	>	TreeNode<K,V> pl = p.left;
2841	>	TreeNode<K,V> pr = p.right;
2842	>	if (pl != null && pr != null) {
2843	>	TreeNode<K,V> s = pr, sl;
2844	>	while ((sl = s.left) != null) // find successor
2845	>	s = sl;
2846	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2847	>	TreeNode<K,V> sr = s.right;
2848	>	TreeNode<K,V> pp = p.parent;
2849	>	if (s == pr) { // p was s's direct parent
2850	>	p.parent = s;
2851	>	s.right = p;
2852	>	}
2853	>	else {
2854	>	TreeNode<K,V> sp = s.parent;
2855	>	if ((p.parent = sp) != null) {
2856	>	if (s == sp.left)
2857	>	sp.left = p;
2858	>	else
2859	>	sp.right = p;
2860	>	}
2861	>	if ((s.right = pr) != null)
2862	>	pr.parent = s;
2863	>	}
2864	>	p.left = null;
2865	>	if ((p.right = sr) != null)
2866	>	sr.parent = p;
2867	>	if ((s.left = pl) != null)
2868	>	pl.parent = s;
2869	>	if ((s.parent = pp) == null)
2870	>	r = s;
2871	>	else if (p == pp.left)
2872	>	pp.left = s;
2873	>	else
2874	>	pp.right = s;
2875	>	if (sr != null)
2876	>	replacement = sr;
2877	>	else
2878	>	replacement = p;
2879	>	}
2880	>	else if (pl != null)
2881	>	replacement = pl;
2882	>	else if (pr != null)
2883	>	replacement = pr;
2884	>	else
2885	>	replacement = p;
2886	>	if (replacement != p) {
2887	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2888	>	if (pp == null)
2889	>	r = replacement;
2890	>	else if (p == pp.left)
2891	>	pp.left = replacement;
2892	>	else
2893	>	pp.right = replacement;
2894	>	p.left = p.right = p.parent = null;
2895	>	}
2896	>
2897	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2898	>
2899	>	if (p == replacement) {  // detach pointers
2900	>	TreeNode<K,V> pp;
2901	>	if ((pp = p.parent) != null) {
2902	>	if (p == pp.left)
2903	>	pp.left = null;
2904	>	else if (p == pp.right)
2905	>	pp.right = null;
2906	>	p.parent = null;
2907	>	}
2908	>	}
2909	>	} finally {
2910	>	unlockRoot();
2911	>	}
2912	>	assert checkInvariants(root);
2913	>	return false;
2914	>	}
2915	>
2916	>	/* ------------------------------------------------------------ */
2917	>	// Red-black tree methods, all adapted from CLR
2918	>
2919	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2920	>	TreeNode<K,V> p) {
2921	>	TreeNode<K,V> r, pp, rl;
2922	>	if (p != null && (r = p.right) != null) {
2923	>	if ((rl = p.right = r.left) != null)
2924	>	rl.parent = p;
2925	>	if ((pp = r.parent = p.parent) == null)
2926	>	(root = r).red = false;
2927	>	else if (pp.left == p)
2928	>	pp.left = r;
2929	>	else
2930	>	pp.right = r;
2931	>	r.left = p;
2932	>	p.parent = r;
2933	>	}
2934	>	return root;
2935	>	}
2936	>
2937	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2938	>	TreeNode<K,V> p) {
2939	>	TreeNode<K,V> l, pp, lr;
2940	>	if (p != null && (l = p.left) != null) {
2941	>	if ((lr = p.left = l.right) != null)
2942	>	lr.parent = p;
2943	>	if ((pp = l.parent = p.parent) == null)
2944	>	(root = l).red = false;
2945	>	else if (pp.right == p)
2946	>	pp.right = l;
2947	>	else
2948	>	pp.left = l;
2949	>	l.right = p;
2950	>	p.parent = l;
2951	>	}
2952	>	return root;
2953	>	}
2954	>
2955	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2956	>	TreeNode<K,V> x) {
2957	>	x.red = true;
2958	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2959	>	if ((xp = x.parent) == null) {
2960	>	x.red = false;
2961	>	return x;
2962	>	}
2963	>	else if (!xp.red || (xpp = xp.parent) == null)
2964	>	return root;
2965	>	if (xp == (xppl = xpp.left)) {
2966	>	if ((xppr = xpp.right) != null && xppr.red) {
2967	>	xppr.red = false;
2968	>	xp.red = false;
2969	>	xpp.red = true;
2970	>	x = xpp;
2971	>	}
2972	>	else {
2973	>	if (x == xp.right) {
2974	>	root = rotateLeft(root, x = xp);
2975	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2976	>	}
2977	>	if (xp != null) {
2978	>	xp.red = false;
2979	>	if (xpp != null) {
2980	>	xpp.red = true;
2981	>	root = rotateRight(root, xpp);
2982	>	}
2983	>	}
2984	>	}
2985	>	}
2986	>	else {
2987	>	if (xppl != null && xppl.red) {
2988	>	xppl.red = false;
2989	>	xp.red = false;
2990	>	xpp.red = true;
2991	>	x = xpp;
2992	>	}
2993	>	else {
2994	>	if (x == xp.left) {
2995	>	root = rotateRight(root, x = xp);
2996	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2997	>	}
2998	>	if (xp != null) {
2999	>	xp.red = false;
3000	>	if (xpp != null) {
3001	>	xpp.red = true;
3002	>	root = rotateLeft(root, xpp);
3003	>	}
3004	>	}
3005	>	}
3006	>	}
3007	>	}
3008	>	}
3009	>
3010	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
3011	>	TreeNode<K,V> x) {
3012	>	for (TreeNode<K,V> xp, xpl, xpr;;)  {
3013	>	if (x == null || x == root)
3014	>	return root;
3015	>	else if ((xp = x.parent) == null) {
3016	>	x.red = false;
3017	>	return x;
3018	>	}
3019	>	else if (x.red) {
3020	>	x.red = false;
3021	>	return root;
3022	>	}
3023	>	else if ((xpl = xp.left) == x) {
3024	>	if ((xpr = xp.right) != null && xpr.red) {
3025	>	xpr.red = false;
3026	>	xp.red = true;
3027	>	root = rotateLeft(root, xp);
3028	>	xpr = (xp = x.parent) == null ? null : xp.right;
3029	>	}
3030	>	if (xpr == null)
3031	>	x = xp;
3032	>	else {
3033	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
3034	>	if ((sr == null || !sr.red) &&
3035	>	(sl == null || !sl.red)) {
3036	>	xpr.red = true;
3037	>	x = xp;
3038	>	}
3039	>	else {
3040	>	if (sr == null || !sr.red) {
3041	>	if (sl != null)
3042	>	sl.red = false;
3043	>	xpr.red = true;
3044	>	root = rotateRight(root, xpr);
3045	>	xpr = (xp = x.parent) == null ?
3046	>	null : xp.right;
3047	>	}
3048	>	if (xpr != null) {
3049	>	xpr.red = (xp == null) ? false : xp.red;
3050	>	if ((sr = xpr.right) != null)
3051	>	sr.red = false;
3052	>	}
3053	>	if (xp != null) {
3054	>	xp.red = false;
3055	>	root = rotateLeft(root, xp);
3056	>	}
3057	>	x = root;
3058	>	}
3059	>	}
3060	>	}
3061	>	else { // symmetric
3062	>	if (xpl != null && xpl.red) {
3063	>	xpl.red = false;
3064	>	xp.red = true;
3065	>	root = rotateRight(root, xp);
3066	>	xpl = (xp = x.parent) == null ? null : xp.left;
3067	>	}
3068	>	if (xpl == null)
3069	>	x = xp;
3070	>	else {
3071	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3072	>	if ((sl == null || !sl.red) &&
3073	>	(sr == null || !sr.red)) {
3074	>	xpl.red = true;
3075	>	x = xp;
3076	>	}
3077	>	else {
3078	>	if (sl == null || !sl.red) {
3079	>	if (sr != null)
3080	>	sr.red = false;
3081	>	xpl.red = true;
3082	>	root = rotateLeft(root, xpl);
3083	>	xpl = (xp = x.parent) == null ?
3084	>	null : xp.left;
3085	>	}
3086	>	if (xpl != null) {
3087	>	xpl.red = (xp == null) ? false : xp.red;
3088	>	if ((sl = xpl.left) != null)
3089	>	sl.red = false;
3090	>	}
3091	>	if (xp != null) {
3092	>	xp.red = false;
3093	>	root = rotateRight(root, xp);
3094	>	}
3095	>	x = root;
3096	>	}
3097	>	}
3098	>	}
3099	>	}
3100	>	}
3101	>	/**
3102	>	* Recursive invariant check
3103	>	*/
3104	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3105	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3106	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3107	>	if (tb != null && tb.next != t)
3108	>	return false;
3109	>	if (tn != null && tn.prev != t)
3110	>	return false;
3111	>	if (tp != null && t != tp.left && t != tp.right)
3112	>	return false;
3113	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3114	>	return false;
3115	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3116	>	return false;
3117	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3118	>	return false;
3119	>	if (tl != null && !checkInvariants(tl))
3120	>	return false;
3121	>	if (tr != null && !checkInvariants(tr))
3122	>	return false;
3123	>	return true;
3124	>	}
3125	>
3126	>	private static final sun.misc.Unsafe U;
3127	>	private static final long LOCKSTATE;
3128	>	static {
3129	>	try {
3130	>	U = sun.misc.Unsafe.getUnsafe();
3131	>	Class<?> k = TreeBin.class;
3132	>	LOCKSTATE = U.objectFieldOffset
3133	>	(k.getDeclaredField("lockState"));
3134	>	} catch (Exception e) {
3135	>	throw new Error(e);
3136		}
3137		}
3138	–	return sb.append('}').toString();
3138		}
3139
3140	+	/* ----------------Table Traversal -------------- */
3141	+
3142		/**
3143	<	* Compares the specified object with this map for equality.
3144	<	* Returns {@code true} if the given object is a map with the same
3144	<	* mappings as this map.  This operation may return misleading
3145	<	* results if either map is concurrently modified during execution
3146	<	* of this method.
3143	>	* Encapsulates traversal for methods such as containsValue; also
3144	>	* serves as a base class for other iterators and spliterators.
3145		*
3146	<	* @param o object to be compared for equality with this map
3147	<	* @return {@code true} if the specified object is equal to this map
3146	>	* Method advance visits once each still-valid node that was
3147	>	* reachable upon iterator construction. It might miss some that
3148	>	* were added to a bin after the bin was visited, which is OK wrt
3149	>	* consistency guarantees. Maintaining this property in the face
3150	>	* of possible ongoing resizes requires a fair amount of
3151	>	* bookkeeping state that is difficult to optimize away amidst
3152	>	* volatile accesses.  Even so, traversal maintains reasonable
3153	>	* throughput.
3154	>	*
3155	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3156	>	* However, if the table has been resized, then all future steps
3157	>	* must traverse both the bin at the current index as well as at
3158	>	* (index + baseSize); and so on for further resizings. To
3159	>	* paranoically cope with potential sharing by users of iterators
3160	>	* across threads, iteration terminates if a bounds checks fails
3161	>	* for a table read.
3162		*/
3163	<	public boolean equals(Object o) {
3164	<	if (o != this) {
3165	<	if (!(o instanceof Map))
3166	<	return false;
3167	<	Map<?,?> m = (Map<?,?>) o;
3168	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3169	<	Object val;
3170	<	while ((val = it.advance()) != null) {
3171	<	Object v = m.get(it.nextKey);
3172	<	if (v == null || (v != val && !v.equals(val)))
3173	<	return false;
3174	<	}
3175	<	for (Map.Entry<?,?> e : m.entrySet()) {
3176	<	Object mk, mv, v;
3177	<	if ((mk = e.getKey()) == null ||
3178	<	(mv = e.getValue()) == null ||
3179	<	(v = internalGet(mk)) == null ||
3180	<	(mv != v && !mv.equals(v)))
3181	<	return false;
3163	>	static class Traverser<K,V> {
3164	>	Node<K,V>[] tab;        // current table; updated if resized
3165	>	Node<K,V> next;         // the next entry to use
3166	>	int index;              // index of bin to use next
3167	>	int baseIndex;          // current index of initial table
3168	>	int baseLimit;          // index bound for initial table
3169	>	final int baseSize;     // initial table size
3170	>
3171	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3172	>	this.tab = tab;
3173	>	this.baseSize = size;
3174	>	this.baseIndex = this.index = index;
3175	>	this.baseLimit = limit;
3176	>	this.next = null;
3177	>	}
3178	>
3179	>	/**
3180	>	* Advances if possible, returning next valid node, or null if none.
3181	>	*/
3182	>	final Node<K,V> advance() {
3183	>	Node<K,V> e;
3184	>	if ((e = next) != null)
3185	>	e = e.next;
3186	>	for (;;) {
3187	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
3188	>	if (e != null)
3189	>	return next = e;
3190	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3191	>	(n = t.length) <= (i = index) || i < 0)
3192	>	return next = null;
3193	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
3194	>	if (e instanceof ForwardingNode) {
3195	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3196	>	e = null;
3197	>	continue;
3198	>	}
3199	>	else if (e instanceof TreeBin)
3200	>	e = ((TreeBin<K,V>)e).first;
3201	>	else
3202	>	e = null;
3203	>	}
3204	>	if ((index += baseSize) >= n)
3205	>	index = ++baseIndex;    // visit upper slots if present
3206		}
3207		}
3172	–	return true;
3208		}
3209
3210	<	/* ----------------Iterators -------------- */
3211	<
3212	<	@SuppressWarnings("serial") static final class KeyIterator<K,V> extends Traverser<K,V,Object>
3213	<	implements Spliterator<K>, Enumeration<K> {
3214	<	KeyIterator(ConcurrentHashMap<K, V> map) { super(map); }
3215	<	KeyIterator(Traverser<K,V,Object> it) {
3216	<	super(it);
3210	>	/**
3211	>	* Base of key, value, and entry Iterators. Adds fields to
3212	>	* Traverser to support iterator.remove
3213	>	*/
3214	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3215	>	final ConcurrentHashMap<K,V> map;
3216	>	Node<K,V> lastReturned;
3217	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3218	>	ConcurrentHashMap<K,V> map) {
3219	>	super(tab, size, index, limit);
3220	>	this.map = map;
3221	>	advance();
3222		}
3223	<	public KeyIterator<K,V> split() {
3224	<	if (nextKey != null)
3223	>
3224	>	public final boolean hasNext() { return next != null; }
3225	>	public final boolean hasMoreElements() { return next != null; }
3226	>
3227	>	public final void remove() {
3228	>	Node<K,V> p;
3229	>	if ((p = lastReturned) == null)
3230		throw new IllegalStateException();
3231	<	return new KeyIterator<K,V>(this);
3231	>	lastReturned = null;
3232	>	map.replaceNode(p.key, null, null);
3233		}
3234	<	@SuppressWarnings("unchecked") public final K next() {
3235	<	if (nextVal == null && advance() == null)
3234	>	}
3235	>
3236	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3237	>	implements Iterator<K>, Enumeration<K> {
3238	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3239	>	ConcurrentHashMap<K,V> map) {
3240	>	super(tab, index, size, limit, map);
3241	>	}
3242	>
3243	>	public final K next() {
3244	>	Node<K,V> p;
3245	>	if ((p = next) == null)
3246		throw new NoSuchElementException();
3247	<	Object k = nextKey;
3248	<	nextVal = null;
3249	<	return (K) k;
3247	>	K k = p.key;
3248	>	lastReturned = p;
3249	>	advance();
3250	>	return k;
3251		}
3252
3253		public final K nextElement() { return next(); }
3254		}
3255
3256	<	@SuppressWarnings("serial") static final class ValueIterator<K,V> extends Traverser<K,V,Object>
3257	<	implements Spliterator<V>, Enumeration<V> {
3258	<	ValueIterator(ConcurrentHashMap<K, V> map) { super(map); }
3259	<	ValueIterator(Traverser<K,V,Object> it) {
3260	<	super(it);
3204	<	}
3205	<	public ValueIterator<K,V> split() {
3206	<	if (nextKey != null)
3207	<	throw new IllegalStateException();
3208	<	return new ValueIterator<K,V>(this);
3256	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3257	>	implements Iterator<V>, Enumeration<V> {
3258	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3259	>	ConcurrentHashMap<K,V> map) {
3260	>	super(tab, index, size, limit, map);
3261		}
3262
3263	<	@SuppressWarnings("unchecked") public final V next() {
3264	<	Object v;
3265	<	if ((v = nextVal) == null && (v = advance()) == null)
3263	>	public final V next() {
3264	>	Node<K,V> p;
3265	>	if ((p = next) == null)
3266		throw new NoSuchElementException();
3267	<	nextVal = null;
3268	<	return (V) v;
3267	>	V v = p.val;
3268	>	lastReturned = p;
3269	>	advance();
3270	>	return v;
3271		}
3272
3273		public final V nextElement() { return next(); }
3274		}
3275
3276	<	@SuppressWarnings("serial") static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3277	<	implements Spliterator<Map.Entry<K,V>> {
3278	<	EntryIterator(ConcurrentHashMap<K, V> map) { super(map); }
3279	<	EntryIterator(Traverser<K,V,Object> it) {
3280	<	super(it);
3227	<	}
3228	<	public EntryIterator<K,V> split() {
3229	<	if (nextKey != null)
3230	<	throw new IllegalStateException();
3231	<	return new EntryIterator<K,V>(this);
3276	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3277	>	implements Iterator<Map.Entry<K,V>> {
3278	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3279	>	ConcurrentHashMap<K,V> map) {
3280	>	super(tab, index, size, limit, map);
3281		}
3282
3283	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3284	<	Object v;
3285	<	if ((v = nextVal) == null && (v = advance()) == null)
3283	>	public final Map.Entry<K,V> next() {
3284	>	Node<K,V> p;
3285	>	if ((p = next) == null)
3286		throw new NoSuchElementException();
3287	<	Object k = nextKey;
3288	<	nextVal = null;
3289	<	return new MapEntry<K,V>((K)k, (V)v, map);
3287	>	K k = p.key;
3288	>	V v = p.val;
3289	>	lastReturned = p;
3290	>	advance();
3291	>	return new MapEntry<K,V>(k, v, map);
3292		}
3293		}
3294
3295		/**
3296	<	* Exported Entry for iterators
3296	>	* Exported Entry for EntryIterator
3297		*/
3298	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3298	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3299		final K key; // non-null
3300		V val;       // non-null
3301	<	final ConcurrentHashMap<K, V> map;
3302	<	MapEntry(K key, V val, ConcurrentHashMap<K, V> map) {
3301	>	final ConcurrentHashMap<K,V> map;
3302	>	MapEntry(K key, V val, ConcurrentHashMap<K,V> map) {
3303		this.key = key;
3304		this.val = val;
3305		this.map = map;
3306		}
3307	<	public final K getKey()       { return key; }
3308	<	public final V getValue()     { return val; }
3309	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3310	<	public final String toString(){ return key + "=" + val; }
3307	>	public K getKey()        { return key; }
3308	>	public V getValue()      { return val; }
3309	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3310	>	public String toString() { return key + "=" + val; }
3311
3312	<	public final boolean equals(Object o) {
3312	>	public boolean equals(Object o) {
3313		Object k, v; Map.Entry<?,?> e;
3314		return ((o instanceof Map.Entry) &&
3315		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3272 | Line 3323 | public class ConcurrentHashMap<K, V>
3323		* value to return is somewhat arbitrary here. Since we do not
3324		* necessarily track asynchronous changes, the most recent
3325		* "previous" value could be different from what we return (or
3326	<	* could even have been removed in which case the put will
3326	>	* could even have been removed, in which case the put will
3327		* re-establish). We do not and cannot guarantee more.
3328		*/
3329	<	public final V setValue(V value) {
3329	>	public V setValue(V value) {
3330		if (value == null) throw new NullPointerException();
3331		V v = val;
3332		val = value;
#	Line 3284 | Line 3335 | public class ConcurrentHashMap<K, V>
3335		}
3336		}
3337
3338	<	/* ---------------- Serialization Support -------------- */
3338	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3339	>	implements Spliterator<K> {
3340	>	long est;               // size estimate
3341	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3342	>	long est) {
3343	>	super(tab, size, index, limit);
3344	>	this.est = est;
3345	>	}
3346	>
3347	>	public Spliterator<K> trySplit() {
3348	>	int i, f, h;
3349	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3350	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3351	>	f, est >>>= 1);
3352	>	}
3353
3354	<	/**
3355	<	* Stripped-down version of helper class used in previous version,
3356	<	* declared for the sake of serialization compatibility
3357	<	*/
3358	<	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	<	}
3354	>	public void forEachRemaining(Consumer<? super K> action) {
3355	>	if (action == null) throw new NullPointerException();
3356	>	for (Node<K,V> p; (p = advance()) != null;)
3357	>	action.accept(p.key);
3358	>	}
3359
3360	<	/**
3361	<	* Saves the state of the {@code ConcurrentHashMap} instance to a
3362	<	* stream (i.e., serializes it).
3363	<	* @param s the stream
3364	<	* @serialData
3365	<	* the key (Object) and value (Object)
3366	<	* for each key-value mapping, followed by a null pair.
3367	<	* The key-value mappings are emitted in no particular order.
3368	<	*/
3369	<	@SuppressWarnings("unchecked") private void writeObject(java.io.ObjectOutputStream s)
3370	<	throws java.io.IOException {
3371	<	if (segments == null) { // for serialization compatibility
3372	<	segments = (Segment<K,V>[])
3373	<	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);
3360	>	public boolean tryAdvance(Consumer<? super K> action) {
3361	>	if (action == null) throw new NullPointerException();
3362	>	Node<K,V> p;
3363	>	if ((p = advance()) == null)
3364	>	return false;
3365	>	action.accept(p.key);
3366	>	return true;
3367	>	}
3368	>
3369	>	public long estimateSize() { return est; }
3370	>
3371	>	public int characteristics() {
3372	>	return Spliterator.DISTINCT | Spliterator.CONCURRENT |
3373	>	Spliterator.NONNULL;
3374		}
3323	–	s.writeObject(null);
3324	–	s.writeObject(null);
3325	–	segments = null; // throw away
3375		}
3376
3377	<	/**
3378	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3379	<	* @param s the stream
3380	<	*/
3381	<	@SuppressWarnings("unchecked") private void readObject(java.io.ObjectInputStream s)
3382	<	throws java.io.IOException, ClassNotFoundException {
3383	<	s.defaultReadObject();
3384	<	this.segments = null; // unneeded
3336	<	// initialize transient final field
3337	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
3377	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3378	>	implements Spliterator<V> {
3379	>	long est;               // size estimate
3380	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3381	>	long est) {
3382	>	super(tab, size, index, limit);
3383	>	this.est = est;
3384	>	}
3385
3386	<	// Create all nodes, then place in table once size is known
3387	<	long size = 0L;
3388	<	Node p = null;
3389	<	for (;;) {
3390	<	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;
3386	>	public Spliterator<V> trySplit() {
3387	>	int i, f, h;
3388	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3389	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3390	>	f, est >>>= 1);
3391		}
3392	<	if (p != null) {
3393	<	boolean init = false;
3394	<	int n;
3395	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3396	<	n = MAXIMUM_CAPACITY;
3397	<	else {
3398	<	int sz = (int)size;
3399	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
3400	<	}
3401	<	int sc = sizeCtl;
3402	<	boolean collide = false;
3403	<	if (n > sc &&
3404	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
3405	<	try {
3406	<	if (table == null) {
3407	<	init = true;
3408	<	Node[] tab = new Node[n];
3409	<	int mask = n - 1;
3410	<	while (p != null) {
3411	<	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	<	}
3392	>
3393	>	public void forEachRemaining(Consumer<? super V> action) {
3394	>	if (action == null) throw new NullPointerException();
3395	>	for (Node<K,V> p; (p = advance()) != null;)
3396	>	action.accept(p.val);
3397	>	}
3398	>
3399	>	public boolean tryAdvance(Consumer<? super V> action) {
3400	>	if (action == null) throw new NullPointerException();
3401	>	Node<K,V> p;
3402	>	if ((p = advance()) == null)
3403	>	return false;
3404	>	action.accept(p.val);
3405	>	return true;
3406	>	}
3407	>
3408	>	public long estimateSize() { return est; }
3409	>
3410	>	public int characteristics() {
3411	>	return Spliterator.CONCURRENT | Spliterator.NONNULL;
3412		}
3413		}
3414
3415	+	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3416	+	implements Spliterator<Map.Entry<K,V>> {
3417	+	final ConcurrentHashMap<K,V> map; // To export MapEntry
3418	+	long est;               // size estimate
3419	+	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3420	+	long est, ConcurrentHashMap<K,V> map) {
3421	+	super(tab, size, index, limit);
3422	+	this.map = map;
3423	+	this.est = est;
3424	+	}
3425
3426	<	// -------------------------------------------------------
3426	>	public Spliterator<Map.Entry<K,V>> trySplit() {
3427	>	int i, f, h;
3428	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3429	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3430	>	f, est >>>= 1, map);
3431	>	}
3432
3433	<	// Sams
3434	<	/** Interface describing a void action of one argument */
3435	<	public interface Action<A> { void apply(A a); }
3436	<	/** Interface describing a void action of two arguments */
3437	<	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); }
3433	>	public void forEachRemaining(Consumer<? super Map.Entry<K,V>> action) {
3434	>	if (action == null) throw new NullPointerException();
3435	>	for (Node<K,V> p; (p = advance()) != null; )
3436	>	action.accept(new MapEntry<K,V>(p.key, p.val, map));
3437	>	}
3438
3439	+	public boolean tryAdvance(Consumer<? super Map.Entry<K,V>> action) {
3440	+	if (action == null) throw new NullPointerException();
3441	+	Node<K,V> p;
3442	+	if ((p = advance()) == null)
3443	+	return false;
3444	+	action.accept(new MapEntry<K,V>(p.key, p.val, map));
3445	+	return true;
3446	+	}
3447
3448	<	// -------------------------------------------------------
3448	>	public long estimateSize() { return est; }
3449	>
3450	>	public int characteristics() {
3451	>	return Spliterator.DISTINCT | Spliterator.CONCURRENT |
3452	>	Spliterator.NONNULL;
3453	>	}
3454	>	}
3455	>
3456	>	// Parallel bulk operations
3457	>
3458	>	/**
3459	>	* Computes initial batch value for bulk tasks. The returned value
3460	>	* is approximately exp2 of the number of times (minus one) to
3461	>	* split task by two before executing leaf action. This value is
3462	>	* faster to compute and more convenient to use as a guide to
3463	>	* splitting than is the depth, since it is used while dividing by
3464	>	* two anyway.
3465	>	*/
3466	>	final int batchFor(long b) {
3467	>	long n;
3468	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3469	>	return 0;
3470	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3471	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3472	>	}
3473
3474		/**
3475		* Performs the given action for each (key, value).
3476		*
3477	+	* @param parallelismThreshold the (estimated) number of elements
3478	+	* needed for this operation to be executed in parallel
3479		* @param action the action
3480	+	* @since 1.8
3481		*/
3482	<	public void forEach(BiAction<K,V> action) {
3483	<	ForkJoinTasks.forEach
3484	<	(this, action).invoke();
3482	>	public void forEach(long parallelismThreshold,
3483	>	BiConsumer<? super K,? super V> action) {
3484	>	if (action == null) throw new NullPointerException();
3485	>	new ForEachMappingTask<K,V>
3486	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3487	>	action).invoke();
3488		}
3489
3490		/**
3491		* Performs the given action for each non-null transformation
3492		* of each (key, value).
3493		*
3494	+	* @param parallelismThreshold the (estimated) number of elements
3495	+	* needed for this operation to be executed in parallel
3496		* @param transformer a function returning the transformation
3497	<	* for an element, or null of there is no transformation (in
3498	<	* which case the action is not applied).
3497	>	* for an element, or null if there is no transformation (in
3498	>	* which case the action is not applied)
3499		* @param action the action
3500	+	* @since 1.8
3501		*/
3502	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3503	<	Action<U> action) {
3504	<	ForkJoinTasks.forEach
3505	<	(this, transformer, action).invoke();
3502	>	public <U> void forEach(long parallelismThreshold,
3503	>	BiFunction<? super K, ? super V, ? extends U> transformer,
3504	>	Consumer<? super U> action) {
3505	>	if (transformer == null || action == null)
3506	>	throw new NullPointerException();
3507	>	new ForEachTransformedMappingTask<K,V,U>
3508	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3509	>	transformer, action).invoke();
3510		}
3511
3512		/**
#	Line 3481 | Line 3516 | public class ConcurrentHashMap<K, V>
3516		* results of any other parallel invocations of the search
3517		* function are ignored.
3518		*
3519	+	* @param parallelismThreshold the (estimated) number of elements
3520	+	* needed for this operation to be executed in parallel
3521		* @param searchFunction a function returning a non-null
3522		* result on success, else null
3523		* @return a non-null result from applying the given search
3524		* function on each (key, value), or null if none
3525	+	* @since 1.8
3526		*/
3527	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3528	<	return ForkJoinTasks.search
3529	<	(this, searchFunction).invoke();
3527	>	public <U> U search(long parallelismThreshold,
3528	>	BiFunction<? super K, ? super V, ? extends U> searchFunction) {
3529	>	if (searchFunction == null) throw new NullPointerException();
3530	>	return new SearchMappingsTask<K,V,U>
3531	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3532	>	searchFunction, new AtomicReference<U>()).invoke();
3533		}
3534
3535		/**
#	Line 3496 | Line 3537 | public class ConcurrentHashMap<K, V>
3537		* of all (key, value) pairs using the given reducer to
3538		* combine values, or null if none.
3539		*
3540	+	* @param parallelismThreshold the (estimated) number of elements
3541	+	* needed for this operation to be executed in parallel
3542		* @param transformer a function returning the transformation
3543	<	* for an element, or null of there is no transformation (in
3544	<	* which case it is not combined).
3543	>	* for an element, or null if there is no transformation (in
3544	>	* which case it is not combined)
3545		* @param reducer a commutative associative combining function
3546		* @return the result of accumulating the given transformation
3547		* of all (key, value) pairs
3548	+	* @since 1.8
3549		*/
3550	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3551	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3552	<	return ForkJoinTasks.reduce
3553	<	(this, transformer, reducer).invoke();
3550	>	public <U> U reduce(long parallelismThreshold,
3551	>	BiFunction<? super K, ? super V, ? extends U> transformer,
3552	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
3553	>	if (transformer == null || reducer == null)
3554	>	throw new NullPointerException();
3555	>	return new MapReduceMappingsTask<K,V,U>
3556	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3557	>	null, transformer, reducer).invoke();
3558		}
3559
3560		/**
#	Line 3514 | Line 3562 | public class ConcurrentHashMap<K, V>
3562		* of all (key, value) pairs using the given reducer to
3563		* combine values, and the given basis as an identity value.
3564		*
3565	+	* @param parallelismThreshold the (estimated) number of elements
3566	+	* needed for this operation to be executed in parallel
3567		* @param transformer a function returning the transformation
3568		* for an element
3569		* @param basis the identity (initial default value) for the reduction
3570		* @param reducer a commutative associative combining function
3571		* @return the result of accumulating the given transformation
3572		* of all (key, value) pairs
3573	+	* @since 1.8
3574		*/
3575	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3576	<	double basis,
3577	<	DoubleByDoubleToDouble reducer) {
3578	<	return ForkJoinTasks.reduceToDouble
3579	<	(this, transformer, basis, reducer).invoke();
3575	>	public double reduceToDoubleIn(long parallelismThreshold,
3576	>	ToDoubleBiFunction<? super K, ? super V> transformer,
3577	>	double basis,
3578	>	DoubleBinaryOperator reducer) {
3579	>	if (transformer == null || reducer == null)
3580	>	throw new NullPointerException();
3581	>	return new MapReduceMappingsToDoubleTask<K,V>
3582	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3583	>	null, transformer, basis, reducer).invoke();
3584		}
3585
3586		/**
#	Line 3533 | Line 3588 | public class ConcurrentHashMap<K, V>
3588		* of all (key, value) pairs using the given reducer to
3589		* combine values, and the given basis as an identity value.
3590		*
3591	+	* @param parallelismThreshold the (estimated) number of elements
3592	+	* needed for this operation to be executed in parallel
3593		* @param transformer a function returning the transformation
3594		* for an element
3595		* @param basis the identity (initial default value) for the reduction
3596		* @param reducer a commutative associative combining function
3597		* @return the result of accumulating the given transformation
3598		* of all (key, value) pairs
3599	+	* @since 1.8
3600		*/
3601	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3601	>	public long reduceToLong(long parallelismThreshold,
3602	>	ToLongBiFunction<? super K, ? super V> transformer,
3603		long basis,
3604	<	LongByLongToLong reducer) {
3605	<	return ForkJoinTasks.reduceToLong
3606	<	(this, transformer, basis, reducer).invoke();
3604	>	LongBinaryOperator reducer) {
3605	>	if (transformer == null || reducer == null)
3606	>	throw new NullPointerException();
3607	>	return new MapReduceMappingsToLongTask<K,V>
3608	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3609	>	null, transformer, basis, reducer).invoke();
3610		}
3611
3612		/**
#	Line 3552 | Line 3614 | public class ConcurrentHashMap<K, V>
3614		* of all (key, value) pairs using the given reducer to
3615		* combine values, and the given basis as an identity value.
3616		*
3617	+	* @param parallelismThreshold the (estimated) number of elements
3618	+	* needed for this operation to be executed in parallel
3619		* @param transformer a function returning the transformation
3620		* for an element
3621		* @param basis the identity (initial default value) for the reduction
3622		* @param reducer a commutative associative combining function
3623		* @return the result of accumulating the given transformation
3624		* of all (key, value) pairs
3625	+	* @since 1.8
3626		*/
3627	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3627	>	public int reduceToInt(long parallelismThreshold,
3628	>	ToIntBiFunction<? super K, ? super V> transformer,
3629		int basis,
3630	<	IntByIntToInt reducer) {
3631	<	return ForkJoinTasks.reduceToInt
3632	<	(this, transformer, basis, reducer).invoke();
3630	>	IntBinaryOperator reducer) {
3631	>	if (transformer == null || reducer == null)
3632	>	throw new NullPointerException();
3633	>	return new MapReduceMappingsToIntTask<K,V>
3634	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3635	>	null, transformer, basis, reducer).invoke();
3636		}
3637
3638		/**
3639		* Performs the given action for each key.
3640		*
3641	+	* @param parallelismThreshold the (estimated) number of elements
3642	+	* needed for this operation to be executed in parallel
3643		* @param action the action
3644	+	* @since 1.8
3645		*/
3646	<	public void forEachKey(Action<K> action) {
3647	<	ForkJoinTasks.forEachKey
3648	<	(this, action).invoke();
3646	>	public void forEachKey(long parallelismThreshold,
3647	>	Consumer<? super K> action) {
3648	>	if (action == null) throw new NullPointerException();
3649	>	new ForEachKeyTask<K,V>
3650	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3651	>	action).invoke();
3652		}
3653
3654		/**
3655		* Performs the given action for each non-null transformation
3656		* of each key.
3657		*
3658	+	* @param parallelismThreshold the (estimated) number of elements
3659	+	* needed for this operation to be executed in parallel
3660		* @param transformer a function returning the transformation
3661	<	* for an element, or null of there is no transformation (in
3662	<	* which case the action is not applied).
3661	>	* for an element, or null if there is no transformation (in
3662	>	* which case the action is not applied)
3663		* @param action the action
3664	+	* @since 1.8
3665		*/
3666	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3667	<	Action<U> action) {
3668	<	ForkJoinTasks.forEachKey
3669	<	(this, transformer, action).invoke();
3666	>	public <U> void forEachKey(long parallelismThreshold,
3667	>	Function<? super K, ? extends U> transformer,
3668	>	Consumer<? super U> action) {
3669	>	if (transformer == null || action == null)
3670	>	throw new NullPointerException();
3671	>	new ForEachTransformedKeyTask<K,V,U>
3672	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3673	>	transformer, action).invoke();
3674		}
3675
3676		/**
#	Line 3598 | Line 3680 | public class ConcurrentHashMap<K, V>
3680		* any other parallel invocations of the search function are
3681		* ignored.
3682		*
3683	+	* @param parallelismThreshold the (estimated) number of elements
3684	+	* needed for this operation to be executed in parallel
3685		* @param searchFunction a function returning a non-null
3686		* result on success, else null
3687		* @return a non-null result from applying the given search
3688		* function on each key, or null if none
3689	+	* @since 1.8
3690		*/
3691	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3692	<	return ForkJoinTasks.searchKeys
3693	<	(this, searchFunction).invoke();
3691	>	public <U> U searchKeys(long parallelismThreshold,
3692	>	Function<? super K, ? extends U> searchFunction) {
3693	>	if (searchFunction == null) throw new NullPointerException();
3694	>	return new SearchKeysTask<K,V,U>
3695	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3696	>	searchFunction, new AtomicReference<U>()).invoke();
3697		}
3698
3699		/**
3700		* Returns the result of accumulating all keys using the given
3701		* reducer to combine values, or null if none.
3702		*
3703	+	* @param parallelismThreshold the (estimated) number of elements
3704	+	* needed for this operation to be executed in parallel
3705		* @param reducer a commutative associative combining function
3706		* @return the result of accumulating all keys using the given
3707		* reducer to combine values, or null if none
3708	+	* @since 1.8
3709		*/
3710	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3711	<	return ForkJoinTasks.reduceKeys
3712	<	(this, reducer).invoke();
3710	>	public K reduceKeys(long parallelismThreshold,
3711	>	BiFunction<? super K, ? super K, ? extends K> reducer) {
3712	>	if (reducer == null) throw new NullPointerException();
3713	>	return new ReduceKeysTask<K,V>
3714	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3715	>	null, reducer).invoke();
3716		}
3717
3718		/**
#	Line 3626 | Line 3720 | public class ConcurrentHashMap<K, V>
3720		* of all keys using the given reducer to combine values, or
3721		* null if none.
3722		*
3723	+	* @param parallelismThreshold the (estimated) number of elements
3724	+	* needed for this operation to be executed in parallel
3725		* @param transformer a function returning the transformation
3726	<	* for an element, or null of there is no transformation (in
3727	<	* which case it is not combined).
3726	>	* for an element, or null if there is no transformation (in
3727	>	* which case it is not combined)
3728		* @param reducer a commutative associative combining function
3729		* @return the result of accumulating the given transformation
3730		* of all keys
3731	+	* @since 1.8
3732		*/
3733	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3734	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3735	<	return ForkJoinTasks.reduceKeys
3736	<	(this, transformer, reducer).invoke();
3733	>	public <U> U reduceKeys(long parallelismThreshold,
3734	>	Function<? super K, ? extends U> transformer,
3735	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
3736	>	if (transformer == null || reducer == null)
3737	>	throw new NullPointerException();
3738	>	return new MapReduceKeysTask<K,V,U>
3739	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3740	>	null, transformer, reducer).invoke();
3741		}
3742
3743		/**
#	Line 3644 | Line 3745 | public class ConcurrentHashMap<K, V>
3745		* of all keys using the given reducer to combine values, and
3746		* the given basis as an identity value.
3747		*
3748	+	* @param parallelismThreshold the (estimated) number of elements
3749	+	* needed for this operation to be executed in parallel
3750		* @param transformer a function returning the transformation
3751		* for an element
3752		* @param basis the identity (initial default value) for the reduction
3753		* @param reducer a commutative associative combining function
3754	<	* @return  the result of accumulating the given transformation
3754	>	* @return the result of accumulating the given transformation
3755		* of all keys
3756	+	* @since 1.8
3757		*/
3758	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3758	>	public double reduceKeysToDouble(long parallelismThreshold,
3759	>	ToDoubleFunction<? super K> transformer,
3760		double basis,
3761	<	DoubleByDoubleToDouble reducer) {
3762	<	return ForkJoinTasks.reduceKeysToDouble
3763	<	(this, transformer, basis, reducer).invoke();
3761	>	DoubleBinaryOperator reducer) {
3762	>	if (transformer == null || reducer == null)
3763	>	throw new NullPointerException();
3764	>	return new MapReduceKeysToDoubleTask<K,V>
3765	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3766	>	null, transformer, basis, reducer).invoke();
3767		}
3768
3769		/**
#	Line 3663 | Line 3771 | public class ConcurrentHashMap<K, V>
3771		* of all keys using the given reducer to combine values, and
3772		* the given basis as an identity value.
3773		*
3774	+	* @param parallelismThreshold the (estimated) number of elements
3775	+	* needed for this operation to be executed in parallel
3776		* @param transformer a function returning the transformation
3777		* for an element
3778		* @param basis the identity (initial default value) for the reduction
3779		* @param reducer a commutative associative combining function
3780		* @return the result of accumulating the given transformation
3781		* of all keys
3782	+	* @since 1.8
3783		*/
3784	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3784	>	public long reduceKeysToLong(long parallelismThreshold,
3785	>	ToLongFunction<? super K> transformer,
3786		long basis,
3787	<	LongByLongToLong reducer) {
3788	<	return ForkJoinTasks.reduceKeysToLong
3789	<	(this, transformer, basis, reducer).invoke();
3787	>	LongBinaryOperator reducer) {
3788	>	if (transformer == null || reducer == null)
3789	>	throw new NullPointerException();
3790	>	return new MapReduceKeysToLongTask<K,V>
3791	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3792	>	null, transformer, basis, reducer).invoke();
3793		}
3794
3795		/**
#	Line 3682 | Line 3797 | public class ConcurrentHashMap<K, V>
3797		* of all keys using the given reducer to combine values, and
3798		* the given basis as an identity value.
3799		*
3800	+	* @param parallelismThreshold the (estimated) number of elements
3801	+	* needed for this operation to be executed in parallel
3802		* @param transformer a function returning the transformation
3803		* for an element
3804		* @param basis the identity (initial default value) for the reduction
3805		* @param reducer a commutative associative combining function
3806		* @return the result of accumulating the given transformation
3807		* of all keys
3808	+	* @since 1.8
3809		*/
3810	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3810	>	public int reduceKeysToInt(long parallelismThreshold,
3811	>	ToIntFunction<? super K> transformer,
3812		int basis,
3813	<	IntByIntToInt reducer) {
3814	<	return ForkJoinTasks.reduceKeysToInt
3815	<	(this, transformer, basis, reducer).invoke();
3813	>	IntBinaryOperator reducer) {
3814	>	if (transformer == null || reducer == null)
3815	>	throw new NullPointerException();
3816	>	return new MapReduceKeysToIntTask<K,V>
3817	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3818	>	null, transformer, basis, reducer).invoke();
3819		}
3820
3821		/**
3822		* Performs the given action for each value.
3823		*
3824	+	* @param parallelismThreshold the (estimated) number of elements
3825	+	* needed for this operation to be executed in parallel
3826		* @param action the action
3827	+	* @since 1.8
3828		*/
3829	<	public void forEachValue(Action<V> action) {
3830	<	ForkJoinTasks.forEachValue
3831	<	(this, action).invoke();
3829	>	public void forEachValue(long parallelismThreshold,
3830	>	Consumer<? super V> action) {
3831	>	if (action == null)
3832	>	throw new NullPointerException();
3833	>	new ForEachValueTask<K,V>
3834	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3835	>	action).invoke();
3836		}
3837
3838		/**
3839		* Performs the given action for each non-null transformation
3840		* of each value.
3841		*
3842	+	* @param parallelismThreshold the (estimated) number of elements
3843	+	* needed for this operation to be executed in parallel
3844		* @param transformer a function returning the transformation
3845	<	* for an element, or null of there is no transformation (in
3846	<	* which case the action is not applied).
3845	>	* for an element, or null if there is no transformation (in
3846	>	* which case the action is not applied)
3847	>	* @param action the action
3848	>	* @since 1.8
3849		*/
3850	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3851	<	Action<U> action) {
3852	<	ForkJoinTasks.forEachValue
3853	<	(this, transformer, action).invoke();
3850	>	public <U> void forEachValue(long parallelismThreshold,
3851	>	Function<? super V, ? extends U> transformer,
3852	>	Consumer<? super U> action) {
3853	>	if (transformer == null || action == null)
3854	>	throw new NullPointerException();
3855	>	new ForEachTransformedValueTask<K,V,U>
3856	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3857	>	transformer, action).invoke();
3858		}
3859
3860		/**
#	Line 3727 | Line 3864 | public class ConcurrentHashMap<K, V>
3864		* any other parallel invocations of the search function are
3865		* ignored.
3866		*
3867	+	* @param parallelismThreshold the (estimated) number of elements
3868	+	* needed for this operation to be executed in parallel
3869		* @param searchFunction a function returning a non-null
3870		* result on success, else null
3871		* @return a non-null result from applying the given search
3872		* function on each value, or null if none
3873	<	*
3873	>	* @since 1.8
3874		*/
3875	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3876	<	return ForkJoinTasks.searchValues
3877	<	(this, searchFunction).invoke();
3875	>	public <U> U searchValues(long parallelismThreshold,
3876	>	Function<? super V, ? extends U> searchFunction) {
3877	>	if (searchFunction == null) throw new NullPointerException();
3878	>	return new SearchValuesTask<K,V,U>
3879	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3880	>	searchFunction, new AtomicReference<U>()).invoke();
3881		}
3882
3883		/**
3884		* Returns the result of accumulating all values using the
3885		* given reducer to combine values, or null if none.
3886		*
3887	+	* @param parallelismThreshold the (estimated) number of elements
3888	+	* needed for this operation to be executed in parallel
3889		* @param reducer a commutative associative combining function
3890	<	* @return  the result of accumulating all values
3890	>	* @return the result of accumulating all values
3891	>	* @since 1.8
3892		*/
3893	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3894	<	return ForkJoinTasks.reduceValues
3895	<	(this, reducer).invoke();
3893	>	public V reduceValues(long parallelismThreshold,
3894	>	BiFunction<? super V, ? super V, ? extends V> reducer) {
3895	>	if (reducer == null) throw new NullPointerException();
3896	>	return new ReduceValuesTask<K,V>
3897	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3898	>	null, reducer).invoke();
3899		}
3900
3901		/**
#	Line 3755 | Line 3903 | public class ConcurrentHashMap<K, V>
3903		* of all values using the given reducer to combine values, or
3904		* null if none.
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, or null of there is no transformation (in
3910	<	* which case it is not combined).
3909	>	* for an element, or null if there is no transformation (in
3910	>	* which case it is not combined)
3911		* @param reducer a commutative associative combining function
3912		* @return the result of accumulating the given transformation
3913		* of all values
3914	+	* @since 1.8
3915		*/
3916	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3917	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3918	<	return ForkJoinTasks.reduceValues
3919	<	(this, transformer, reducer).invoke();
3916	>	public <U> U reduceValues(long parallelismThreshold,
3917	>	Function<? super V, ? extends U> transformer,
3918	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
3919	>	if (transformer == null || reducer == null)
3920	>	throw new NullPointerException();
3921	>	return new MapReduceValuesTask<K,V,U>
3922	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3923	>	null, transformer, reducer).invoke();
3924		}
3925
3926		/**
#	Line 3773 | Line 3928 | public class ConcurrentHashMap<K, V>
3928		* of all values using the given reducer to combine values,
3929		* and the given basis as an identity value.
3930		*
3931	+	* @param parallelismThreshold the (estimated) number of elements
3932	+	* needed for this operation to be executed in parallel
3933		* @param transformer a function returning the transformation
3934		* for an element
3935		* @param basis the identity (initial default value) for the reduction
3936		* @param reducer a commutative associative combining function
3937		* @return the result of accumulating the given transformation
3938		* of all values
3939	+	* @since 1.8
3940		*/
3941	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
3941	>	public double reduceValuesToDouble(long parallelismThreshold,
3942	>	ToDoubleFunction<? super V> transformer,
3943		double basis,
3944	<	DoubleByDoubleToDouble reducer) {
3945	<	return ForkJoinTasks.reduceValuesToDouble
3946	<	(this, transformer, basis, reducer).invoke();
3944	>	DoubleBinaryOperator reducer) {
3945	>	if (transformer == null || reducer == null)
3946	>	throw new NullPointerException();
3947	>	return new MapReduceValuesToDoubleTask<K,V>
3948	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3949	>	null, transformer, basis, reducer).invoke();
3950		}
3951
3952		/**
#	Line 3792 | Line 3954 | public class ConcurrentHashMap<K, V>
3954		* of all values using the given reducer to combine values,
3955		* and the given basis as an identity value.
3956		*
3957	+	* @param parallelismThreshold the (estimated) number of elements
3958	+	* needed for this operation to be executed in parallel
3959		* @param transformer a function returning the transformation
3960		* for an element
3961		* @param basis the identity (initial default value) for the reduction
3962		* @param reducer a commutative associative combining function
3963		* @return the result of accumulating the given transformation
3964		* of all values
3965	+	* @since 1.8
3966		*/
3967	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
3967	>	public long reduceValuesToLong(long parallelismThreshold,
3968	>	ToLongFunction<? super V> transformer,
3969		long basis,
3970	<	LongByLongToLong reducer) {
3971	<	return ForkJoinTasks.reduceValuesToLong
3972	<	(this, transformer, basis, reducer).invoke();
3970	>	LongBinaryOperator reducer) {
3971	>	if (transformer == null || reducer == null)
3972	>	throw new NullPointerException();
3973	>	return new MapReduceValuesToLongTask<K,V>
3974	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3975	>	null, transformer, basis, reducer).invoke();
3976		}
3977
3978		/**
#	Line 3811 | Line 3980 | public class ConcurrentHashMap<K, V>
3980		* of all values using the given reducer to combine values,
3981		* and the given basis as an identity value.
3982		*
3983	+	* @param parallelismThreshold the (estimated) number of elements
3984	+	* needed for this operation to be executed in parallel
3985		* @param transformer a function returning the transformation
3986		* for an element
3987		* @param basis the identity (initial default value) for the reduction
3988		* @param reducer a commutative associative combining function
3989		* @return the result of accumulating the given transformation
3990		* of all values
3991	+	* @since 1.8
3992		*/
3993	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
3993	>	public int reduceValuesToInt(long parallelismThreshold,
3994	>	ToIntFunction<? super V> transformer,
3995		int basis,
3996	<	IntByIntToInt reducer) {
3997	<	return ForkJoinTasks.reduceValuesToInt
3998	<	(this, transformer, basis, reducer).invoke();
3996	>	IntBinaryOperator reducer) {
3997	>	if (transformer == null || reducer == null)
3998	>	throw new NullPointerException();
3999	>	return new MapReduceValuesToIntTask<K,V>
4000	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4001	>	null, transformer, basis, reducer).invoke();
4002		}
4003
4004		/**
4005		* Performs the given action for each entry.
4006		*
4007	+	* @param parallelismThreshold the (estimated) number of elements
4008	+	* needed for this operation to be executed in parallel
4009		* @param action the action
4010	+	* @since 1.8
4011		*/
4012	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
4013	<	ForkJoinTasks.forEachEntry
4014	<	(this, action).invoke();
4012	>	public void forEachEntry(long parallelismThreshold,
4013	>	Consumer<? super Map.Entry<K,V>> action) {
4014	>	if (action == null) throw new NullPointerException();
4015	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
4016	>	action).invoke();
4017		}
4018
4019		/**
4020		* Performs the given action for each non-null transformation
4021		* of each entry.
4022		*
4023	+	* @param parallelismThreshold the (estimated) number of elements
4024	+	* needed for this operation to be executed in parallel
4025		* @param transformer a function returning the transformation
4026	<	* for an element, or null of there is no transformation (in
4027	<	* which case the action is not applied).
4026	>	* for an element, or null if there is no transformation (in
4027	>	* which case the action is not applied)
4028		* @param action the action
4029	+	* @since 1.8
4030		*/
4031	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
4032	<	Action<U> action) {
4033	<	ForkJoinTasks.forEachEntry
4034	<	(this, transformer, action).invoke();
4031	>	public <U> void forEachEntry(long parallelismThreshold,
4032	>	Function<Map.Entry<K,V>, ? extends U> transformer,
4033	>	Consumer<? super U> action) {
4034	>	if (transformer == null || action == null)
4035	>	throw new NullPointerException();
4036	>	new ForEachTransformedEntryTask<K,V,U>
4037	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4038	>	transformer, action).invoke();
4039		}
4040
4041		/**
#	Line 3857 | Line 4045 | public class ConcurrentHashMap<K, V>
4045		* any other parallel invocations of the search function are
4046		* ignored.
4047		*
4048	+	* @param parallelismThreshold the (estimated) number of elements
4049	+	* needed for this operation to be executed in parallel
4050		* @param searchFunction a function returning a non-null
4051		* result on success, else null
4052		* @return a non-null result from applying the given search
4053		* function on each entry, or null if none
4054	+	* @since 1.8
4055		*/
4056	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4057	<	return ForkJoinTasks.searchEntries
4058	<	(this, searchFunction).invoke();
4056	>	public <U> U searchEntries(long parallelismThreshold,
4057	>	Function<Map.Entry<K,V>, ? extends U> searchFunction) {
4058	>	if (searchFunction == null) throw new NullPointerException();
4059	>	return new SearchEntriesTask<K,V,U>
4060	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4061	>	searchFunction, new AtomicReference<U>()).invoke();
4062		}
4063
4064		/**
4065		* Returns the result of accumulating all entries using the
4066		* given reducer to combine values, or null if none.
4067		*
4068	+	* @param parallelismThreshold the (estimated) number of elements
4069	+	* needed for this operation to be executed in parallel
4070		* @param reducer a commutative associative combining function
4071		* @return the result of accumulating all entries
4072	+	* @since 1.8
4073		*/
4074	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4075	<	return ForkJoinTasks.reduceEntries
4076	<	(this, reducer).invoke();
4074	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4075	>	BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4076	>	if (reducer == null) throw new NullPointerException();
4077	>	return new ReduceEntriesTask<K,V>
4078	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4079	>	null, reducer).invoke();
4080		}
4081
4082		/**
#	Line 3884 | Line 4084 | public class ConcurrentHashMap<K, V>
4084		* of all entries using the given reducer to combine values,
4085		* or null if none.
4086		*
4087	+	* @param parallelismThreshold the (estimated) number of elements
4088	+	* needed for this operation to be executed in parallel
4089		* @param transformer a function returning the transformation
4090	<	* for an element, or null of there is no transformation (in
4091	<	* which case it is not combined).
4090	>	* for an element, or null if there is no transformation (in
4091	>	* which case it is not combined)
4092		* @param reducer a commutative associative combining function
4093		* @return the result of accumulating the given transformation
4094		* of all entries
4095	+	* @since 1.8
4096		*/
4097	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4098	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4099	<	return ForkJoinTasks.reduceEntries
4100	<	(this, transformer, reducer).invoke();
4097	>	public <U> U reduceEntries(long parallelismThreshold,
4098	>	Function<Map.Entry<K,V>, ? extends U> transformer,
4099	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
4100	>	if (transformer == null || reducer == null)
4101	>	throw new NullPointerException();
4102	>	return new MapReduceEntriesTask<K,V,U>
4103	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4104	>	null, transformer, reducer).invoke();
4105		}
4106
4107		/**
#	Line 3902 | Line 4109 | public class ConcurrentHashMap<K, V>
4109		* of all entries using the given reducer to combine values,
4110		* and the given basis as an identity value.
4111		*
4112	+	* @param parallelismThreshold the (estimated) number of elements
4113	+	* needed for this operation to be executed in parallel
4114		* @param transformer a function returning the transformation
4115		* for an element
4116		* @param basis the identity (initial default value) for the reduction
4117		* @param reducer a commutative associative combining function
4118		* @return the result of accumulating the given transformation
4119		* of all entries
4120	+	* @since 1.8
4121		*/
4122	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4122	>	public double reduceEntriesToDouble(long parallelismThreshold,
4123	>	ToDoubleFunction<Map.Entry<K,V>> transformer,
4124		double basis,
4125	<	DoubleByDoubleToDouble reducer) {
4126	<	return ForkJoinTasks.reduceEntriesToDouble
4127	<	(this, transformer, basis, reducer).invoke();
4125	>	DoubleBinaryOperator reducer) {
4126	>	if (transformer == null || reducer == null)
4127	>	throw new NullPointerException();
4128	>	return new MapReduceEntriesToDoubleTask<K,V>
4129	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4130	>	null, transformer, basis, reducer).invoke();
4131		}
4132
4133		/**
#	Line 3921 | Line 4135 | public class ConcurrentHashMap<K, V>
4135		* of all entries using the given reducer to combine values,
4136		* and the given basis as an identity value.
4137		*
4138	+	* @param parallelismThreshold the (estimated) number of elements
4139	+	* needed for this operation to be executed in parallel
4140		* @param transformer a function returning the transformation
4141		* for an element
4142		* @param basis the identity (initial default value) for the reduction
4143		* @param reducer a commutative associative combining function
4144	<	* @return  the result of accumulating the given transformation
4144	>	* @return the result of accumulating the given transformation
4145		* of all entries
4146	+	* @since 1.8
4147		*/
4148	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4148	>	public long reduceEntriesToLong(long parallelismThreshold,
4149	>	ToLongFunction<Map.Entry<K,V>> transformer,
4150		long basis,
4151	<	LongByLongToLong reducer) {
4152	<	return ForkJoinTasks.reduceEntriesToLong
4153	<	(this, transformer, basis, reducer).invoke();
4151	>	LongBinaryOperator reducer) {
4152	>	if (transformer == null || reducer == null)
4153	>	throw new NullPointerException();
4154	>	return new MapReduceEntriesToLongTask<K,V>
4155	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4156	>	null, transformer, basis, reducer).invoke();
4157		}
4158
4159		/**
#	Line 3940 | Line 4161 | public class ConcurrentHashMap<K, V>
4161		* of all entries using the given reducer to combine values,
4162		* and the given basis as an identity value.
4163		*
4164	+	* @param parallelismThreshold the (estimated) number of elements
4165	+	* needed for this operation to be executed in parallel
4166		* @param transformer a function returning the transformation
4167		* for an element
4168		* @param basis the identity (initial default value) for the reduction
4169		* @param reducer a commutative associative combining function
4170		* @return the result of accumulating the given transformation
4171		* of all entries
4172	+	* @since 1.8
4173		*/
4174	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4174	>	public int reduceEntriesToInt(long parallelismThreshold,
4175	>	ToIntFunction<Map.Entry<K,V>> transformer,
4176		int basis,
4177	<	IntByIntToInt reducer) {
4178	<	return ForkJoinTasks.reduceEntriesToInt
4179	<	(this, transformer, basis, reducer).invoke();
4177	>	IntBinaryOperator reducer) {
4178	>	if (transformer == null || reducer == null)
4179	>	throw new NullPointerException();
4180	>	return new MapReduceEntriesToIntTask<K,V>
4181	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4182	>	null, transformer, basis, reducer).invoke();
4183		}
4184
4185	+
4186		/* ----------------Views -------------- */
4187
4188		/**
4189		* Base class for views.
4190		*/
4191	<	static abstract class CHMView<K, V> {
4192	<	final ConcurrentHashMap<K, V> map;
4193	<	CHMView(ConcurrentHashMap<K, V> map)  { this.map = map; }
4191	>	abstract static class CollectionView<K,V,E>
4192	>	implements Collection<E>, java.io.Serializable {
4193	>	private static final long serialVersionUID = 7249069246763182397L;
4194	>	final ConcurrentHashMap<K,V> map;
4195	>	CollectionView(ConcurrentHashMap<K,V> map)  { this.map = map; }
4196
4197		/**
4198		* Returns the map backing this view.
#	Line 3970 | Line 4201 | public class ConcurrentHashMap<K, V>
4201		*/
4202		public ConcurrentHashMap<K,V> getMap() { return map; }
4203
4204	<	public final int size()                 { return map.size(); }
4205	<	public final boolean isEmpty()          { return map.isEmpty(); }
4206	<	public final void clear()               { map.clear(); }
4204	>	/**
4205	>	* Removes all of the elements from this view, by removing all
4206	>	* the mappings from the map backing this view.
4207	>	*/
4208	>	public final void clear()      { map.clear(); }
4209	>	public final int size()        { return map.size(); }
4210	>	public final boolean isEmpty() { return map.isEmpty(); }
4211
4212		// implementations below rely on concrete classes supplying these
4213	<	abstract public Iterator<?> iterator();
4214	<	abstract public boolean contains(Object o);
4215	<	abstract public boolean remove(Object o);
4213	>	// abstract methods
4214	>	/**
4215	>	* Returns a "weakly consistent" iterator that will never
4216	>	* throw {@link ConcurrentModificationException}, and
4217	>	* guarantees to traverse elements as they existed upon
4218	>	* construction of the iterator, and may (but is not
4219	>	* guaranteed to) reflect any modifications subsequent to
4220	>	* construction.
4221	>	*/
4222	>	public abstract Iterator<E> iterator();
4223	>	public abstract boolean contains(Object o);
4224	>	public abstract boolean remove(Object o);
4225
4226		private static final String oomeMsg = "Required array size too large";
4227
4228		public final Object[] toArray() {
4229		long sz = map.mappingCount();
4230	<	if (sz > (long)(MAX_ARRAY_SIZE))
4230	>	if (sz > MAX_ARRAY_SIZE)
4231		throw new OutOfMemoryError(oomeMsg);
4232		int n = (int)sz;
4233		Object[] r = new Object[n];
4234		int i = 0;
4235	<	Iterator<?> it = iterator();
3992	<	while (it.hasNext()) {
4235	>	for (E e : this) {
4236		if (i == n) {
4237		if (n >= MAX_ARRAY_SIZE)
4238		throw new OutOfMemoryError(oomeMsg);
#	Line 3999 | Line 4242 | public class ConcurrentHashMap<K, V>
4242		n += (n >>> 1) + 1;
4243		r = Arrays.copyOf(r, n);
4244		}
4245	<	r[i++] = it.next();
4245	>	r[i++] = e;
4246		}
4247		return (i == n) ? r : Arrays.copyOf(r, i);
4248		}
4249
4250	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4250	>	@SuppressWarnings("unchecked")
4251	>	public final <T> T[] toArray(T[] a) {
4252		long sz = map.mappingCount();
4253	<	if (sz > (long)(MAX_ARRAY_SIZE))
4253	>	if (sz > MAX_ARRAY_SIZE)
4254		throw new OutOfMemoryError(oomeMsg);
4255		int m = (int)sz;
4256		T[] r = (a.length >= m) ? a :
#	Line 4014 | Line 4258 | public class ConcurrentHashMap<K, V>
4258		.newInstance(a.getClass().getComponentType(), m);
4259		int n = r.length;
4260		int i = 0;
4261	<	Iterator<?> it = iterator();
4018	<	while (it.hasNext()) {
4261	>	for (E e : this) {
4262		if (i == n) {
4263		if (n >= MAX_ARRAY_SIZE)
4264		throw new OutOfMemoryError(oomeMsg);
#	Line 4025 | Line 4268 | public class ConcurrentHashMap<K, V>
4268		n += (n >>> 1) + 1;
4269		r = Arrays.copyOf(r, n);
4270		}
4271	<	r[i++] = (T)it.next();
4271	>	r[i++] = (T)e;
4272		}
4273		if (a == r && i < n) {
4274		r[i] = null; // null-terminate
#	Line 4034 | Line 4277 | public class ConcurrentHashMap<K, V>
4277		return (i == n) ? r : Arrays.copyOf(r, i);
4278		}
4279
4280	<	public final int hashCode() {
4281	<	int h = 0;
4282	<	for (Iterator<?> it = iterator(); it.hasNext();)
4283	<	h += it.next().hashCode();
4284	<	return h;
4285	<	}
4286	<
4280	>	/**
4281	>	* Returns a string representation of this collection.
4282	>	* The string representation consists of the string representations
4283	>	* of the collection's elements in the order they are returned by
4284	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4285	>	* Adjacent elements are separated by the characters {@code ", "}
4286	>	* (comma and space).  Elements are converted to strings as by
4287	>	* {@link String#valueOf(Object)}.
4288	>	*
4289	>	* @return a string representation of this collection
4290	>	*/
4291		public final String toString() {
4292		StringBuilder sb = new StringBuilder();
4293		sb.append('[');
4294	<	Iterator<?> it = iterator();
4294	>	Iterator<E> it = iterator();
4295		if (it.hasNext()) {
4296		for (;;) {
4297		Object e = it.next();
#	Line 4059 | Line 4306 | public class ConcurrentHashMap<K, V>
4306
4307		public final boolean containsAll(Collection<?> c) {
4308		if (c != this) {
4309	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
4063	<	Object e = it.next();
4309	>	for (Object e : c) {
4310		if (e == null || !contains(e))
4311		return false;
4312		}
#	Line 4070 | Line 4316 | public class ConcurrentHashMap<K, V>
4316
4317		public final boolean removeAll(Collection<?> c) {
4318		boolean modified = false;
4319	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4319	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4320		if (c.contains(it.next())) {
4321		it.remove();
4322		modified = true;
#	Line 4081 | Line 4327 | public class ConcurrentHashMap<K, V>
4327
4328		public final boolean retainAll(Collection<?> c) {
4329		boolean modified = false;
4330	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4330	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4331		if (!c.contains(it.next())) {
4332		it.remove();
4333		modified = true;
#	Line 4095 | Line 4341 | public class ConcurrentHashMap<K, V>
4341		/**
4342		* A view of a ConcurrentHashMap as a {@link Set} of keys, in
4343		* which additions may optionally be enabled by mapping to a
4344	<	* common value.  This class cannot be directly instantiated. See
4345	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4346	<	* {@link #newKeySet(int)}.
4344	>	* common value.  This class cannot be directly instantiated.
4345	>	* See {@link #keySet() keySet()},
4346	>	* {@link #keySet(Object) keySet(V)},
4347	>	* {@link #newKeySet() newKeySet()},
4348	>	* {@link #newKeySet(int) newKeySet(int)}.
4349	>	*
4350	>	* @since 1.8
4351		*/
4352	<	public static class KeySetView<K,V> extends CHMView<K,V> implements Set<K>, java.io.Serializable {
4352	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4353	>	implements Set<K>, java.io.Serializable {
4354		private static final long serialVersionUID = 7249069246763182397L;
4355		private final V value;
4356	<	KeySetView(ConcurrentHashMap<K, V> map, V value) {  // non-public
4356	>	KeySetView(ConcurrentHashMap<K,V> map, V value) {  // non-public
4357		super(map);
4358		this.value = value;
4359		}
#	Line 4112 | Line 4363 | public class ConcurrentHashMap<K, V>
4363		* or {@code null} if additions are not supported.
4364		*
4365		* @return the default mapped value for additions, or {@code null}
4366	<	* if not supported.
4366	>	* if not supported
4367		*/
4368		public V getMappedValue() { return value; }
4369
4370	<	// implement Set API
4371	<
4370	>	/**
4371	>	* {@inheritDoc}
4372	>	* @throws NullPointerException if the specified key is null
4373	>	*/
4374		public boolean contains(Object o) { return map.containsKey(o); }
4122	–	public boolean remove(Object o)   { return map.remove(o) != null; }
4375
4376		/**
4377	<	* Returns a "weakly consistent" iterator that will never
4378	<	* throw {@link ConcurrentModificationException}, and
4379	<	* guarantees to traverse elements as they existed upon
4380	<	* construction of the iterator, and may (but is not
4381	<	* guaranteed to) reflect any modifications subsequent to
4382	<	* construction.
4377	>	* Removes the key from this map view, by removing the key (and its
4378	>	* corresponding value) from the backing map.  This method does
4379	>	* nothing if the key is not in the map.
4380	>	*
4381	>	* @param  o the key to be removed from the backing map
4382	>	* @return {@code true} if the backing map contained the specified key
4383	>	* @throws NullPointerException if the specified key is null
4384	>	*/
4385	>	public boolean remove(Object o) { return map.remove(o) != null; }
4386	>
4387	>	/**
4388	>	* @return an iterator over the keys of the backing map
4389	>	*/
4390	>	public Iterator<K> iterator() {
4391	>	Node<K,V>[] t;
4392	>	ConcurrentHashMap<K,V> m = map;
4393	>	int f = (t = m.table) == null ? 0 : t.length;
4394	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4395	>	}
4396	>
4397	>	/**
4398	>	* Adds the specified key to this set view by mapping the key to
4399	>	* the default mapped value in the backing map, if defined.
4400		*
4401	<	* @return an iterator over the keys of this map
4401	>	* @param e key to be added
4402	>	* @return {@code true} if this set changed as a result of the call
4403	>	* @throws NullPointerException if the specified key is null
4404	>	* @throws UnsupportedOperationException if no default mapped value
4405	>	* for additions was provided
4406		*/
4134	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4407		public boolean add(K e) {
4408		V v;
4409		if ((v = value) == null)
4410		throw new UnsupportedOperationException();
4411	<	if (e == null)
4140	<	throw new NullPointerException();
4141	<	return map.internalPutIfAbsent(e, v) == null;
4411	>	return map.putVal(e, v, true) == null;
4412		}
4413	+
4414	+	/**
4415	+	* Adds all of the elements in the specified collection to this set,
4416	+	* as if by calling {@link #add} on each one.
4417	+	*
4418	+	* @param c the elements to be inserted into this set
4419	+	* @return {@code true} if this set changed as a result of the call
4420	+	* @throws NullPointerException if the collection or any of its
4421	+	* elements are {@code null}
4422	+	* @throws UnsupportedOperationException if no default mapped value
4423	+	* for additions was provided
4424	+	*/
4425		public boolean addAll(Collection<? extends K> c) {
4426		boolean added = false;
4427		V v;
4428		if ((v = value) == null)
4429		throw new UnsupportedOperationException();
4430		for (K e : c) {
4431	<	if (e == null)
4150	<	throw new NullPointerException();
4151	<	if (map.internalPutIfAbsent(e, v) == null)
4431	>	if (map.putVal(e, v, true) == null)
4432		added = true;
4433		}
4434		return added;
4435		}
4436	+
4437	+	public int hashCode() {
4438	+	int h = 0;
4439	+	for (K e : this)
4440	+	h += e.hashCode();
4441	+	return h;
4442	+	}
4443	+
4444		public boolean equals(Object o) {
4445		Set<?> c;
4446		return ((o instanceof Set) &&
#	Line 4160 | Line 4448 | public class ConcurrentHashMap<K, V>
4448		(containsAll(c) && c.containsAll(this))));
4449		}
4450
4451	<	/**
4452	<	* Performs the given action for each key.
4453	<	*
4454	<	* @param action the action
4455	<	*/
4456	<	public void forEach(Action<K> action) {
4169	<	ForkJoinTasks.forEachKey
4170	<	(map, action).invoke();
4451	>	public Spliterator<K> spliterator() {
4452	>	Node<K,V>[] t;
4453	>	ConcurrentHashMap<K,V> m = map;
4454	>	long n = m.sumCount();
4455	>	int f = (t = m.table) == null ? 0 : t.length;
4456	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4457		}
4458
4459	<	/**
4460	<	* Performs the given action for each non-null transformation
4461	<	* of each key.
4462	<	*
4463	<	* @param transformer a function returning the transformation
4464	<	* for an element, or null of there is no transformation (in
4465	<	* which case the action is not applied).
4466	<	* @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();
4255	<	}
4256	<
4257	<	/**
4258	<	* Returns the result of accumulating the given transformation
4259	<	* of all keys using the given reducer to combine values, and
4260	<	* the given basis as an identity value.
4261	<	*
4262	<	* @param transformer a function returning the transformation
4263	<	* for an element
4264	<	* @param basis the identity (initial default value) for the reduction
4265	<	* @param reducer a commutative associative combining function
4266	<	* @return the result of accumulating the given transformation
4267	<	* of all keys
4268	<	*/
4269	<	public int reduceToInt(ObjectToInt<? super K> transformer,
4270	<	int basis,
4271	<	IntByIntToInt reducer) {
4272	<	return ForkJoinTasks.reduceKeysToInt
4273	<	(map, transformer, basis, reducer).invoke();
4459	>	public void forEach(Consumer<? super K> action) {
4460	>	if (action == null) throw new NullPointerException();
4461	>	Node<K,V>[] t;
4462	>	if ((t = map.table) != null) {
4463	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4464	>	for (Node<K,V> p; (p = it.advance()) != null; )
4465	>	action.accept(p.key);
4466	>	}
4467		}
4275	–
4468		}
4469
4470		/**
4471		* A view of a ConcurrentHashMap as a {@link Collection} of
4472		* values, in which additions are disabled. This class cannot be
4473	<	* directly instantiated. See {@link #values},
4282	<	*
4283	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4284	<	* that will never throw {@link ConcurrentModificationException},
4285	<	* and guarantees to traverse elements as they existed upon
4286	<	* construction of the iterator, and may (but is not guaranteed to)
4287	<	* reflect any modifications subsequent to construction.
4473	>	* directly instantiated. See {@link #values()}.
4474		*/
4475	<	public static final class ValuesView<K,V> extends CHMView<K,V>
4476	<	implements Collection<V> {
4477	<	ValuesView(ConcurrentHashMap<K, V> map)   { super(map); }
4478	<	public final boolean contains(Object o) { return map.containsValue(o); }
4475	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4476	>	implements Collection<V>, java.io.Serializable {
4477	>	private static final long serialVersionUID = 2249069246763182397L;
4478	>	ValuesView(ConcurrentHashMap<K,V> map) { super(map); }
4479	>	public final boolean contains(Object o) {
4480	>	return map.containsValue(o);
4481	>	}
4482	>
4483		public final boolean remove(Object o) {
4484		if (o != null) {
4485	<	Iterator<V> it = new ValueIterator<K,V>(map);
4296	<	while (it.hasNext()) {
4485	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4486		if (o.equals(it.next())) {
4487		it.remove();
4488		return true;
#	Line 4303 | Line 4492 | public class ConcurrentHashMap<K, V>
4492		return false;
4493		}
4494
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	–	*/
4495		public final Iterator<V> iterator() {
4496	<	return new ValueIterator<K,V>(map);
4496	>	ConcurrentHashMap<K,V> m = map;
4497	>	Node<K,V>[] t;
4498	>	int f = (t = m.table) == null ? 0 : t.length;
4499	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4500		}
4501	+
4502		public final boolean add(V e) {
4503		throw new UnsupportedOperationException();
4504		}
#	Line 4323 | Line 4506 | public class ConcurrentHashMap<K, V>
4506		throw new UnsupportedOperationException();
4507		}
4508
4509	<	/**
4510	<	* Performs the given action for each value.
4511	<	*
4512	<	* @param action the action
4513	<	*/
4514	<	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();
4509	>	public Spliterator<V> spliterator() {
4510	>	Node<K,V>[] t;
4511	>	ConcurrentHashMap<K,V> m = map;
4512	>	long n = m.sumCount();
4513	>	int f = (t = m.table) == null ? 0 : t.length;
4514	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4515		}
4516
4517	<	/**
4518	<	* Returns the result of accumulating the given transformation
4519	<	* of all values using the given reducer to combine values, or
4520	<	* null if none.
4521	<	*
4522	<	* @param transformer a function returning the transformation
4523	<	* for an element, or null of there is no transformation (in
4524	<	* 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();
4396	<	}
4397	<
4398	<	/**
4399	<	* Returns the result of accumulating the given transformation
4400	<	* of all values using the given reducer to combine values,
4401	<	* and the given basis as an identity value.
4402	<	*
4403	<	* @param transformer a function returning the transformation
4404	<	* for an element
4405	<	* @param basis the identity (initial default value) for the reduction
4406	<	* @param reducer a commutative associative combining function
4407	<	* @return the result of accumulating the given transformation
4408	<	* of all values
4409	<	*/
4410	<	public double reduceToDouble(ObjectToDouble<? super V> transformer,
4411	<	double basis,
4412	<	DoubleByDoubleToDouble reducer) {
4413	<	return ForkJoinTasks.reduceValuesToDouble
4414	<	(map, transformer, basis, reducer).invoke();
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();
4517	>	public void forEach(Consumer<? super V> action) {
4518	>	if (action == null) throw new NullPointerException();
4519	>	Node<K,V>[] t;
4520	>	if ((t = map.table) != null) {
4521	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4522	>	for (Node<K,V> p; (p = it.advance()) != null; )
4523	>	action.accept(p.val);
4524	>	}
4525		}
4454	–
4526		}
4527
4528		/**
4529		* A view of a ConcurrentHashMap as a {@link Set} of (key, value)
4530		* entries.  This class cannot be directly instantiated. See
4531	<	* {@link #entrySet}.
4531	>	* {@link #entrySet()}.
4532		*/
4533	<	public static final class EntrySetView<K,V> extends CHMView<K,V>
4534	<	implements Set<Map.Entry<K,V>> {
4535	<	EntrySetView(ConcurrentHashMap<K, V> map) { super(map); }
4536	<	public final boolean contains(Object o) {
4533	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4534	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4535	>	private static final long serialVersionUID = 2249069246763182397L;
4536	>	EntrySetView(ConcurrentHashMap<K,V> map) { super(map); }
4537	>
4538	>	public boolean contains(Object o) {
4539		Object k, v, r; Map.Entry<?,?> e;
4540		return ((o instanceof Map.Entry) &&
4541		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4470 | Line 4543 | public class ConcurrentHashMap<K, V>
4543		(v = e.getValue()) != null &&
4544		(v == r || v.equals(r)));
4545		}
4546	<	public final boolean remove(Object o) {
4546	>
4547	>	public boolean remove(Object o) {
4548		Object k, v; Map.Entry<?,?> e;
4549		return ((o instanceof Map.Entry) &&
4550		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4479 | Line 4553 | public class ConcurrentHashMap<K, V>
4553		}
4554
4555		/**
4556	<	* 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
4556	>	* @return an iterator over the entries of the backing map
4557		*/
4558	<	public final Iterator<Map.Entry<K,V>> iterator() {
4559	<	return new EntryIterator<K,V>(map);
4558	>	public Iterator<Map.Entry<K,V>> iterator() {
4559	>	ConcurrentHashMap<K,V> m = map;
4560	>	Node<K,V>[] t;
4561	>	int f = (t = m.table) == null ? 0 : t.length;
4562	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4563		}
4564
4565	<	public final boolean add(Entry<K,V> e) {
4566	<	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;
4565	>	public boolean add(Entry<K,V> e) {
4566	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4567		}
4568	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4568	>
4569	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4570		boolean added = false;
4571		for (Entry<K,V> e : c) {
4572		if (add(e))
#	Line 4507 | Line 4574 | public class ConcurrentHashMap<K, V>
4574		}
4575		return added;
4576		}
4577	<	public boolean equals(Object o) {
4577	>
4578	>	public final int hashCode() {
4579	>	int h = 0;
4580	>	Node<K,V>[] t;
4581	>	if ((t = map.table) != null) {
4582	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4583	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4584	>	h += p.hashCode();
4585	>	}
4586	>	}
4587	>	return h;
4588	>	}
4589	>
4590	>	public final boolean equals(Object o) {
4591		Set<?> c;
4592		return ((o instanceof Set) &&
4593		((c = (Set<?>)o) == this ||
4594		(containsAll(c) && c.containsAll(this))));
4595		}
4596
4597	<	/**
4598	<	* Performs the given action for each entry.
4599	<	*
4600	<	* @param action the action
4601	<	*/
4602	<	public void forEach(Action<Map.Entry<K,V>> action) {
4523	<	ForkJoinTasks.forEachEntry
4524	<	(map, action).invoke();
4597	>	public Spliterator<Map.Entry<K,V>> spliterator() {
4598	>	Node<K,V>[] t;
4599	>	ConcurrentHashMap<K,V> m = map;
4600	>	long n = m.sumCount();
4601	>	int f = (t = m.table) == null ? 0 : t.length;
4602	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4603		}
4604
4605	<	/**
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) {
4605	>	public void forEach(Consumer<? super Map.Entry<K,V>> action) {
4606		if (action == null) throw new NullPointerException();
4607	<	return new ForEachMappingTask<K,V>(map, null, -1, null, action);
4608	<	}
4609	<
4610	<	/**
4611	<	* Returns a task that when invoked, performs the given
4612	<	* action for each non-null transformation of each (key, value)
4680	<	*
4681	<	* @param map the map
4682	<	* @param transformer a function returning the transformation
4683	<	* for an element, or null if there is no transformation (in
4684	<	* which case the action is not applied)
4685	<	* @param action the action
4686	<	* @return the task
4687	<	*/
4688	<	public static <K,V,U> ForkJoinTask<Void> forEach
4689	<	(ConcurrentHashMap<K,V> map,
4690	<	BiFun<? super K, ? super V, ? extends U> transformer,
4691	<	Action<U> action) {
4692	<	if (transformer == null || action == null)
4693	<	throw new NullPointerException();
4694	<	return new ForEachTransformedMappingTask<K,V,U>
4695	<	(map, null, -1, null, transformer, action);
4696	<	}
4697	<
4698	<	/**
4699	<	* Returns a task that when invoked, returns a non-null result
4700	<	* from applying the given search function on each (key,
4701	<	* value), or null if none. Upon success, further element
4702	<	* processing is suppressed and the results of any other
4703	<	* parallel invocations of the search function are ignored.
4704	<	*
4705	<	* @param map the map
4706	<	* @param searchFunction a function returning a non-null
4707	<	* result on success, else null
4708	<	* @return the task
4709	<	*/
4710	<	public static <K,V,U> ForkJoinTask<U> search
4711	<	(ConcurrentHashMap<K,V> map,
4712	<	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4713	<	if (searchFunction == null) throw new NullPointerException();
4714	<	return new SearchMappingsTask<K,V,U>
4715	<	(map, null, -1, null, searchFunction,
4716	<	new AtomicReference<U>());
4717	<	}
4718	<
4719	<	/**
4720	<	* Returns a task that when invoked, returns the result of
4721	<	* accumulating the given transformation of all (key, value) pairs
4722	<	* using the given reducer to combine values, or null if none.
4723	<	*
4724	<	* @param map the map
4725	<	* @param transformer a function returning the transformation
4726	<	* for an element, or null if there is no transformation (in
4727	<	* which case it is not combined).
4728	<	* @param reducer a commutative associative combining function
4729	<	* @return the task
4730	<	*/
4731	<	public static <K,V,U> ForkJoinTask<U> reduce
4732	<	(ConcurrentHashMap<K,V> map,
4733	<	BiFun<? super K, ? super V, ? extends U> transformer,
4734	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4735	<	if (transformer == null || reducer == null)
4736	<	throw new NullPointerException();
4737	<	return new MapReduceMappingsTask<K,V,U>
4738	<	(map, null, -1, null, transformer, reducer);
4739	<	}
4740	<
4741	<	/**
4742	<	* Returns a task that when invoked, returns the result of
4743	<	* accumulating the given transformation of all (key, value) pairs
4744	<	* using the given reducer to combine values, and the given
4745	<	* basis as an identity value.
4746	<	*
4747	<	* @param map the map
4748	<	* @param transformer a function returning the transformation
4749	<	* for an element
4750	<	* @param basis the identity (initial default value) for the reduction
4751	<	* @param reducer a commutative associative combining function
4752	<	* @return the task
4753	<	*/
4754	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4755	<	(ConcurrentHashMap<K,V> map,
4756	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
4757	<	double basis,
4758	<	DoubleByDoubleToDouble reducer) {
4759	<	if (transformer == null || reducer == null)
4760	<	throw new NullPointerException();
4761	<	return new MapReduceMappingsToDoubleTask<K,V>
4762	<	(map, null, -1, null, transformer, basis, reducer);
4763	<	}
4764	<
4765	<	/**
4766	<	* Returns a task that when invoked, returns the result of
4767	<	* accumulating the given transformation of all (key, value) pairs
4768	<	* using the given reducer to combine values, and the given
4769	<	* basis as an identity value.
4770	<	*
4771	<	* @param map the map
4772	<	* @param transformer a function returning the transformation
4773	<	* for an element
4774	<	* @param basis the identity (initial default value) for the reduction
4775	<	* @param reducer a commutative associative combining function
4776	<	* @return the task
4777	<	*/
4778	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4779	<	(ConcurrentHashMap<K,V> map,
4780	<	ObjectByObjectToLong<? super K, ? super V> transformer,
4781	<	long basis,
4782	<	LongByLongToLong reducer) {
4783	<	if (transformer == null || reducer == null)
4784	<	throw new NullPointerException();
4785	<	return new MapReduceMappingsToLongTask<K,V>
4786	<	(map, null, -1, null, transformer, basis, reducer);
4787	<	}
4788	<
4789	<	/**
4790	<	* Returns a task that when invoked, returns the result of
4791	<	* accumulating the given transformation of all (key, value) pairs
4792	<	* using the given reducer to combine values, and the given
4793	<	* basis as an identity value.
4794	<	*
4795	<	* @param transformer a function returning the transformation
4796	<	* for an element
4797	<	* @param basis the identity (initial default value) for the reduction
4798	<	* @param reducer a commutative associative combining function
4799	<	* @return the task
4800	<	*/
4801	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4802	<	(ConcurrentHashMap<K,V> map,
4803	<	ObjectByObjectToInt<? super K, ? super V> transformer,
4804	<	int basis,
4805	<	IntByIntToInt reducer) {
4806	<	if (transformer == null || reducer == null)
4807	<	throw new NullPointerException();
4808	<	return new MapReduceMappingsToIntTask<K,V>
4809	<	(map, null, -1, null, transformer, basis, reducer);
4810	<	}
4811	<
4812	<	/**
4813	<	* Returns a task that when invoked, performs the given action
4814	<	* for each key.
4815	<	*
4816	<	* @param map the map
4817	<	* @param action the action
4818	<	* @return the task
4819	<	*/
4820	<	public static <K,V> ForkJoinTask<Void> forEachKey
4821	<	(ConcurrentHashMap<K,V> map,
4822	<	Action<K> action) {
4823	<	if (action == null) throw new NullPointerException();
4824	<	return new ForEachKeyTask<K,V>(map, null, -1, null, action);
4825	<	}
4826	<
4827	<	/**
4828	<	* Returns a task that when invoked, performs the given action
4829	<	* for each non-null transformation of each key.
4830	<	*
4831	<	* @param map the map
4832	<	* @param transformer a function returning the transformation
4833	<	* for an element, or null if there is no transformation (in
4834	<	* which case the action is not applied)
4835	<	* @param action the action
4836	<	* @return the task
4837	<	*/
4838	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4839	<	(ConcurrentHashMap<K,V> map,
4840	<	Fun<? super K, ? extends U> transformer,
4841	<	Action<U> action) {
4842	<	if (transformer == null || action == null)
4843	<	throw new NullPointerException();
4844	<	return new ForEachTransformedKeyTask<K,V,U>
4845	<	(map, null, -1, null, transformer, action);
4846	<	}
4847	<
4848	<	/**
4849	<	* Returns a task that when invoked, returns a non-null result
4850	<	* from applying the given search function on each key, or
4851	<	* null if none.  Upon success, further element processing is
4852	<	* suppressed and the results of any other parallel
4853	<	* invocations of the search function are ignored.
4854	<	*
4855	<	* @param map the map
4856	<	* @param searchFunction a function returning a non-null
4857	<	* result on success, else null
4858	<	* @return the task
4859	<	*/
4860	<	public static <K,V,U> ForkJoinTask<U> searchKeys
4861	<	(ConcurrentHashMap<K,V> map,
4862	<	Fun<? super K, ? extends U> searchFunction) {
4863	<	if (searchFunction == null) throw new NullPointerException();
4864	<	return new SearchKeysTask<K,V,U>
4865	<	(map, null, -1, null, searchFunction,
4866	<	new AtomicReference<U>());
4867	<	}
4868	<
4869	<	/**
4870	<	* Returns a task that when invoked, returns the result of
4871	<	* accumulating all keys using the given reducer to combine
4872	<	* values, or null if none.
4873	<	*
4874	<	* @param map the map
4875	<	* @param reducer a commutative associative combining function
4876	<	* @return the task
4877	<	*/
4878	<	public static <K,V> ForkJoinTask<K> reduceKeys
4879	<	(ConcurrentHashMap<K,V> map,
4880	<	BiFun<? super K, ? super K, ? extends K> reducer) {
4881	<	if (reducer == null) throw new NullPointerException();
4882	<	return new ReduceKeysTask<K,V>
4883	<	(map, null, -1, null, reducer);
4884	<	}
4885	<
4886	<	/**
4887	<	* Returns a task that when invoked, returns the result of
4888	<	* accumulating the given transformation of all keys using the given
4889	<	* reducer to combine values, or null if none.
4890	<	*
4891	<	* @param map the map
4892	<	* @param transformer a function returning the transformation
4893	<	* for an element, or null if there is no transformation (in
4894	<	* which case it is not combined).
4895	<	* @param reducer a commutative associative combining function
4896	<	* @return the task
4897	<	*/
4898	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
4899	<	(ConcurrentHashMap<K,V> map,
4900	<	Fun<? super K, ? extends U> transformer,
4901	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4902	<	if (transformer == null || reducer == null)
4903	<	throw new NullPointerException();
4904	<	return new MapReduceKeysTask<K,V,U>
4905	<	(map, null, -1, null, transformer, reducer);
4906	<	}
4907	<
4908	<	/**
4909	<	* Returns a task that when invoked, returns the result of
4910	<	* accumulating the given transformation of all keys using the given
4911	<	* reducer to combine values, and the given basis as an
4912	<	* identity value.
4913	<	*
4914	<	* @param map the map
4915	<	* @param transformer a function returning the transformation
4916	<	* for an element
4917	<	* @param basis the identity (initial default value) for the reduction
4918	<	* @param reducer a commutative associative combining function
4919	<	* @return the task
4920	<	*/
4921	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4922	<	(ConcurrentHashMap<K,V> map,
4923	<	ObjectToDouble<? super K> transformer,
4924	<	double basis,
4925	<	DoubleByDoubleToDouble reducer) {
4926	<	if (transformer == null || reducer == null)
4927	<	throw new NullPointerException();
4928	<	return new MapReduceKeysToDoubleTask<K,V>
4929	<	(map, null, -1, null, transformer, basis, reducer);
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);
4607	>	Node<K,V>[] t;
4608	>	if ((t = map.table) != null) {
4609	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4610	>	for (Node<K,V> p; (p = it.advance()) != null; )
4611	>	action.accept(new MapEntry<K,V>(p.key, p.val, map));
4612	>	}
4613		}
4614
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	–	}
4615		}
4616
4617		// -------------------------------------------------------
4618
4619		/**
4620	<	* Base for FJ tasks for bulk operations. This adds a variant of
4621	<	* CountedCompleters and some split and merge bookkeeping to
5318	<	* iterator functionality. The forEach and reduce methods are
5319	<	* similar to those illustrated in CountedCompleter documentation,
5320	<	* except that bottom-up reduction completions perform them within
5321	<	* their compute methods. The search methods are like forEach
5322	<	* except they continually poll for success and exit early.  Also,
5323	<	* exceptions are handled in a simpler manner, by just trying to
5324	<	* complete root task exceptionally.
5325	<	*/
5326	<	@SuppressWarnings("serial") static abstract class BulkTask<K,V,R> extends Traverser<K,V,R> {
5327	<	final BulkTask<K,V,?> parent;  // completion target
5328	<	int batch;                     // split control; -1 for unknown
5329	<	int pending;                   // completion control
5330	<
5331	<	BulkTask(ConcurrentHashMap<K,V> map, BulkTask<K,V,?> parent,
5332	<	int batch) {
5333	<	super(map);
5334	<	this.parent = parent;
5335	<	this.batch = batch;
5336	<	if (parent != null && map != null) { // split parent
5337	<	Node[] t;
5338	<	if ((t = parent.tab) == null &&
5339	<	(t = parent.tab = map.table) != null)
5340	<	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;
5346	<	}
5347	<	}
5348	<
5349	<	/**
5350	<	* Forces root task to complete.
5351	<	* @param ex if null, complete normally, else exceptionally
5352	<	* @return false to simplify use
5353	<	*/
5354	<	final boolean tryCompleteComputation(Throwable ex) {
5355	<	for (BulkTask<K,V,?> a = this;;) {
5356	<	BulkTask<K,V,?> p = a.parent;
5357	<	if (p == null) {
5358	<	if (ex != null)
5359	<	a.completeExceptionally(ex);
5360	<	else
5361	<	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;
5401	<	}
5402	<	}
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
4620	>	* Base class for bulk tasks. Repeats some fields and code from
4621	>	* class Traverser, because we need to subclass CountedCompleter.
4622		*/
4623	<	@SuppressWarnings("serial") static abstract class BulkAction<K,V,R> extends BulkTask<K,V,R> {
4624	<	BulkAction<K,V,?> nextTask;
4625	<	BulkAction(ConcurrentHashMap<K,V> map, BulkTask<K,V,?> parent,
4626	<	int batch, BulkAction<K,V,?> nextTask) {
4627	<	super(map, parent, batch);
4628	<	this.nextTask = nextTask;
4623	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4624	>	Node<K,V>[] tab;        // same as Traverser
4625	>	Node<K,V> next;
4626	>	int index;
4627	>	int baseIndex;
4628	>	int baseLimit;
4629	>	final int baseSize;
4630	>	int batch;              // split control
4631	>
4632	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4633	>	super(par);
4634	>	this.batch = b;
4635	>	this.index = this.baseIndex = i;
4636	>	if ((this.tab = t) == null)
4637	>	this.baseSize = this.baseLimit = 0;
4638	>	else if (par == null)
4639	>	this.baseSize = this.baseLimit = t.length;
4640	>	else {
4641	>	this.baseLimit = f;
4642	>	this.baseSize = par.baseSize;
4643	>	}
4644		}
4645
4646		/**
4647	<	* Try to complete task and upward parents. Upon hitting
5440	<	* non-completed parent, if a non-FJ task, try to help out the
5441	<	* computation.
4647	>	* Same as Traverser version
4648		*/
4649	<	final void tryComplete(BulkAction<K,V,?> subtasks) {
4650	<	BulkTask<K,V,?> a = this, s = a;
4651	<	for (int c;;) {
4652	<	if ((c = a.pending) == 0) {
4653	<	if ((a = (s = a).parent) == null) {
4654	<	s.quietlyComplete();
4655	<	break;
4656	<	}
4657	<	}
4658	<	else if (a.casPending(c, c - 1)) {
4659	<	if (subtasks != null && !inForkJoinPool()) {
4660	<	while ((s = a.parent) != null)
4661	<	a = s;
4662	<	while (!a.isDone()) {
4663	<	BulkAction<K,V,?> next = subtasks.nextTask;
4664	<	if (subtasks.tryUnfork())
5459	<	subtasks.exec();
5460	<	if ((subtasks = next) == null)
5461	<	break;
5462	<	}
4649	>	final Node<K,V> advance() {
4650	>	Node<K,V> e;
4651	>	if ((e = next) != null)
4652	>	e = e.next;
4653	>	for (;;) {
4654	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4655	>	if (e != null)
4656	>	return next = e;
4657	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4658	>	(n = t.length) <= (i = index) || i < 0)
4659	>	return next = null;
4660	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4661	>	if (e instanceof ForwardingNode) {
4662	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4663	>	e = null;
4664	>	continue;
4665		}
4666	<	break;
4666	>	else if (e instanceof TreeBin)
4667	>	e = ((TreeBin<K,V>)e).first;
4668	>	else
4669	>	e = null;
4670		}
4671	+	if ((index += baseSize) >= n)
4672	+	index = ++baseIndex;    // visit upper slots if present
4673		}
4674		}
5468	–
4675		}
4676
4677		/*
4678		* Task classes. Coded in a regular but ugly format/style to
4679		* simplify checks that each variant differs in the right way from
4680	<	* others.
4681	<	*/
4682	<
4683	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4684	<	extends BulkAction<K,V,Void> {
4685	<	final Action<K> action;
4680	>	* others. The null screenings exist because compilers cannot tell
4681	>	* that we've already null-checked task arguments, so we force
4682	>	* simplest hoisted bypass to help avoid convoluted traps.
4683	>	*/
4684	>	@SuppressWarnings("serial")
4685	>	static final class ForEachKeyTask<K,V>
4686	>	extends BulkTask<K,V,Void> {
4687	>	final Consumer<? super K> action;
4688		ForEachKeyTask
4689	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4690	<	ForEachKeyTask<K,V> nextTask,
4691	<	Action<K> action) {
5484	<	super(m, p, b, nextTask);
4689	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4690	>	Consumer<? super K> action) {
4691	>	super(p, b, i, f, t);
4692		this.action = action;
4693		}
4694	<	@SuppressWarnings("unchecked") public final boolean exec() {
4695	<	final Action<K> action = this.action;
4696	<	if (action == null)
4697	<	return abortOnNullFunction();
4698	<	ForEachKeyTask<K,V> subtasks = null;
4699	<	try {
4700	<	int b = batch(), c;
4701	<	while (b > 1 && baseIndex != baseLimit) {
4702	<	do {} while (!casPending(c = pending, c+1));
4703	<	(subtasks = new ForEachKeyTask<K,V>
4704	<	(map, this, b >>>= 1, subtasks, action)).fork();
4705	<	}
4706	<	while (advance() != null)
5500	<	action.apply((K)nextKey);
5501	<	} catch (Throwable ex) {
5502	<	return tryCompleteComputation(ex);
4694	>	public final void compute() {
4695	>	final Consumer<? super K> action;
4696	>	if ((action = this.action) != null) {
4697	>	for (int i = baseIndex, f, h; batch > 0 &&
4698	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4699	>	addToPendingCount(1);
4700	>	new ForEachKeyTask<K,V>
4701	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4702	>	action).fork();
4703	>	}
4704	>	for (Node<K,V> p; (p = advance()) != null;)
4705	>	action.accept(p.key);
4706	>	propagateCompletion();
4707		}
5504	–	tryComplete(subtasks);
5505	–	return false;
4708		}
4709		}
4710
4711	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4712	<	extends BulkAction<K,V,Void> {
4713	<	final Action<V> action;
4711	>	@SuppressWarnings("serial")
4712	>	static final class ForEachValueTask<K,V>
4713	>	extends BulkTask<K,V,Void> {
4714	>	final Consumer<? super V> action;
4715		ForEachValueTask
4716	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4717	<	ForEachValueTask<K,V> nextTask,
4718	<	Action<V> action) {
5516	<	super(m, p, b, nextTask);
4716	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4717	>	Consumer<? super V> action) {
4718	>	super(p, b, i, f, t);
4719		this.action = action;
4720		}
4721	<	@SuppressWarnings("unchecked") public final boolean exec() {
4722	<	final Action<V> action = this.action;
4723	<	if (action == null)
4724	<	return abortOnNullFunction();
4725	<	ForEachValueTask<K,V> subtasks = null;
4726	<	try {
4727	<	int b = batch(), c;
4728	<	while (b > 1 && baseIndex != baseLimit) {
4729	<	do {} while (!casPending(c = pending, c+1));
4730	<	(subtasks = new ForEachValueTask<K,V>
4731	<	(map, this, b >>>= 1, subtasks, action)).fork();
4732	<	}
4733	<	Object v;
5532	<	while ((v = advance()) != null)
5533	<	action.apply((V)v);
5534	<	} catch (Throwable ex) {
5535	<	return tryCompleteComputation(ex);
4721	>	public final void compute() {
4722	>	final Consumer<? super V> action;
4723	>	if ((action = this.action) != null) {
4724	>	for (int i = baseIndex, f, h; batch > 0 &&
4725	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4726	>	addToPendingCount(1);
4727	>	new ForEachValueTask<K,V>
4728	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4729	>	action).fork();
4730	>	}
4731	>	for (Node<K,V> p; (p = advance()) != null;)
4732	>	action.accept(p.val);
4733	>	propagateCompletion();
4734		}
5537	–	tryComplete(subtasks);
5538	–	return false;
4735		}
4736		}
4737
4738	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4739	<	extends BulkAction<K,V,Void> {
4740	<	final Action<Entry<K,V>> action;
4738	>	@SuppressWarnings("serial")
4739	>	static final class ForEachEntryTask<K,V>
4740	>	extends BulkTask<K,V,Void> {
4741	>	final Consumer<? super Entry<K,V>> action;
4742		ForEachEntryTask
4743	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4744	<	ForEachEntryTask<K,V> nextTask,
4745	<	Action<Entry<K,V>> action) {
5549	<	super(m, p, b, nextTask);
4743	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4744	>	Consumer<? super Entry<K,V>> action) {
4745	>	super(p, b, i, f, t);
4746		this.action = action;
4747		}
4748	<	@SuppressWarnings("unchecked") public final boolean exec() {
4749	<	final Action<Entry<K,V>> action = this.action;
4750	<	if (action == null)
4751	<	return abortOnNullFunction();
4752	<	ForEachEntryTask<K,V> subtasks = null;
4753	<	try {
4754	<	int b = batch(), c;
4755	<	while (b > 1 && baseIndex != baseLimit) {
4756	<	do {} while (!casPending(c = pending, c+1));
4757	<	(subtasks = new ForEachEntryTask<K,V>
4758	<	(map, this, b >>>= 1, subtasks, action)).fork();
4759	<	}
4760	<	Object v;
5565	<	while ((v = advance()) != null)
5566	<	action.apply(entryFor((K)nextKey, (V)v));
5567	<	} catch (Throwable ex) {
5568	<	return tryCompleteComputation(ex);
4748	>	public final void compute() {
4749	>	final Consumer<? super Entry<K,V>> action;
4750	>	if ((action = this.action) != null) {
4751	>	for (int i = baseIndex, f, h; batch > 0 &&
4752	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4753	>	addToPendingCount(1);
4754	>	new ForEachEntryTask<K,V>
4755	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4756	>	action).fork();
4757	>	}
4758	>	for (Node<K,V> p; (p = advance()) != null; )
4759	>	action.accept(p);
4760	>	propagateCompletion();
4761		}
5570	–	tryComplete(subtasks);
5571	–	return false;
4762		}
4763		}
4764
4765	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4766	<	extends BulkAction<K,V,Void> {
4767	<	final BiAction<K,V> action;
4765	>	@SuppressWarnings("serial")
4766	>	static final class ForEachMappingTask<K,V>
4767	>	extends BulkTask<K,V,Void> {
4768	>	final BiConsumer<? super K, ? super V> action;
4769		ForEachMappingTask
4770	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4771	<	ForEachMappingTask<K,V> nextTask,
4772	<	BiAction<K,V> action) {
5582	<	super(m, p, b, nextTask);
4770	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4771	>	BiConsumer<? super K,? super V> action) {
4772	>	super(p, b, i, f, t);
4773		this.action = action;
4774		}
4775	<	@SuppressWarnings("unchecked") public final boolean exec() {
4776	<	final BiAction<K,V> action = this.action;
4777	<	if (action == null)
4778	<	return abortOnNullFunction();
4779	<	ForEachMappingTask<K,V> subtasks = null;
4780	<	try {
4781	<	int b = batch(), c;
4782	<	while (b > 1 && baseIndex != baseLimit) {
4783	<	do {} while (!casPending(c = pending, c+1));
4784	<	(subtasks = new ForEachMappingTask<K,V>
4785	<	(map, this, b >>>= 1, subtasks, action)).fork();
4786	<	}
4787	<	Object v;
5598	<	while ((v = advance()) != null)
5599	<	action.apply((K)nextKey, (V)v);
5600	<	} catch (Throwable ex) {
5601	<	return tryCompleteComputation(ex);
4775	>	public final void compute() {
4776	>	final BiConsumer<? super K, ? super V> action;
4777	>	if ((action = this.action) != null) {
4778	>	for (int i = baseIndex, f, h; batch > 0 &&
4779	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4780	>	addToPendingCount(1);
4781	>	new ForEachMappingTask<K,V>
4782	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4783	>	action).fork();
4784	>	}
4785	>	for (Node<K,V> p; (p = advance()) != null; )
4786	>	action.accept(p.key, p.val);
4787	>	propagateCompletion();
4788		}
5603	–	tryComplete(subtasks);
5604	–	return false;
4789		}
4790		}
4791
4792	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4793	<	extends BulkAction<K,V,Void> {
4794	<	final Fun<? super K, ? extends U> transformer;
4795	<	final Action<U> action;
4792	>	@SuppressWarnings("serial")
4793	>	static final class ForEachTransformedKeyTask<K,V,U>
4794	>	extends BulkTask<K,V,Void> {
4795	>	final Function<? super K, ? extends U> transformer;
4796	>	final Consumer<? super U> action;
4797		ForEachTransformedKeyTask
4798	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4799	<	ForEachTransformedKeyTask<K,V,U> nextTask,
4800	<	Fun<? super K, ? extends U> transformer,
4801	<	Action<U> action) {
4802	<	super(m, p, b, nextTask);
4803	<	this.transformer = transformer;
4804	<	this.action = action;
4805	<
4806	<	}
4807	<	@SuppressWarnings("unchecked") public final boolean exec() {
4808	<	final Fun<? super K, ? extends U> transformer =
4809	<	this.transformer;
4810	<	final Action<U> action = this.action;
4811	<	if (transformer == null || action == null)
4812	<	return abortOnNullFunction();
4813	<	ForEachTransformedKeyTask<K,V,U> subtasks = null;
4814	<	try {
4815	<	int b = batch(), c;
4816	<	while (b > 1 && baseIndex != baseLimit) {
4817	<	do {} while (!casPending(c = pending, c+1));
4818	<	(subtasks = new ForEachTransformedKeyTask<K,V,U>
4819	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
4820	<	}
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);
4798	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4799	>	Function<? super K, ? extends U> transformer, Consumer<? super U> action) {
4800	>	super(p, b, i, f, t);
4801	>	this.transformer = transformer; this.action = action;
4802	>	}
4803	>	public final void compute() {
4804	>	final Function<? super K, ? extends U> transformer;
4805	>	final Consumer<? super U> action;
4806	>	if ((transformer = this.transformer) != null &&
4807	>	(action = this.action) != null) {
4808	>	for (int i = baseIndex, f, h; batch > 0 &&
4809	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4810	>	addToPendingCount(1);
4811	>	new ForEachTransformedKeyTask<K,V,U>
4812	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4813	>	transformer, action).fork();
4814	>	}
4815	>	for (Node<K,V> p; (p = advance()) != null; ) {
4816	>	U u;
4817	>	if ((u = transformer.apply(p.key)) != null)
4818	>	action.accept(u);
4819	>	}
4820	>	propagateCompletion();
4821		}
5644	–	tryComplete(subtasks);
5645	–	return false;
4822		}
4823		}
4824
4825	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4826	<	extends BulkAction<K,V,Void> {
4827	<	final Fun<? super V, ? extends U> transformer;
4828	<	final Action<U> action;
4825	>	@SuppressWarnings("serial")
4826	>	static final class ForEachTransformedValueTask<K,V,U>
4827	>	extends BulkTask<K,V,Void> {
4828	>	final Function<? super V, ? extends U> transformer;
4829	>	final Consumer<? super U> action;
4830		ForEachTransformedValueTask
4831	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4832	<	ForEachTransformedValueTask<K,V,U> nextTask,
4833	<	Fun<? super V, ? extends U> transformer,
4834	<	Action<U> action) {
4835	<	super(m, p, b, nextTask);
4836	<	this.transformer = transformer;
4837	<	this.action = action;
4838	<
4839	<	}
4840	<	@SuppressWarnings("unchecked") public final boolean exec() {
4841	<	final Fun<? super V, ? extends U> transformer =
4842	<	this.transformer;
4843	<	final Action<U> action = this.action;
4844	<	if (transformer == null || action == null)
4845	<	return abortOnNullFunction();
4846	<	ForEachTransformedValueTask<K,V,U> subtasks = null;
4847	<	try {
4848	<	int b = batch(), c;
4849	<	while (b > 1 && baseIndex != baseLimit) {
4850	<	do {} while (!casPending(c = pending, c+1));
4851	<	(subtasks = new ForEachTransformedValueTask<K,V,U>
4852	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
4853	<	}
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);
4831	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4832	>	Function<? super V, ? extends U> transformer, Consumer<? super U> action) {
4833	>	super(p, b, i, f, t);
4834	>	this.transformer = transformer; this.action = action;
4835	>	}
4836	>	public final void compute() {
4837	>	final Function<? super V, ? extends U> transformer;
4838	>	final Consumer<? super U> action;
4839	>	if ((transformer = this.transformer) != null &&
4840	>	(action = this.action) != null) {
4841	>	for (int i = baseIndex, f, h; batch > 0 &&
4842	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4843	>	addToPendingCount(1);
4844	>	new ForEachTransformedValueTask<K,V,U>
4845	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4846	>	transformer, action).fork();
4847	>	}
4848	>	for (Node<K,V> p; (p = advance()) != null; ) {
4849	>	U u;
4850	>	if ((u = transformer.apply(p.val)) != null)
4851	>	action.accept(u);
4852	>	}
4853	>	propagateCompletion();
4854		}
5685	–	tryComplete(subtasks);
5686	–	return false;
4855		}
4856		}
4857
4858	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4859	<	extends BulkAction<K,V,Void> {
4860	<	final Fun<Map.Entry<K,V>, ? extends U> transformer;
4861	<	final Action<U> action;
4858	>	@SuppressWarnings("serial")
4859	>	static final class ForEachTransformedEntryTask<K,V,U>
4860	>	extends BulkTask<K,V,Void> {
4861	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
4862	>	final Consumer<? super U> action;
4863		ForEachTransformedEntryTask
4864	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4865	<	ForEachTransformedEntryTask<K,V,U> nextTask,
4866	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4867	<	Action<U> action) {
4868	<	super(m, p, b, nextTask);
4869	<	this.transformer = transformer;
4870	<	this.action = action;
4871	<
4872	<	}
4873	<	@SuppressWarnings("unchecked") public final boolean exec() {
4874	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
4875	<	this.transformer;
4876	<	final Action<U> action = this.action;
4877	<	if (transformer == null || action == null)
4878	<	return abortOnNullFunction();
4879	<	ForEachTransformedEntryTask<K,V,U> subtasks = null;
4880	<	try {
4881	<	int b = batch(), c;
4882	<	while (b > 1 && baseIndex != baseLimit) {
4883	<	do {} while (!casPending(c = pending, c+1));
4884	<	(subtasks = new ForEachTransformedEntryTask<K,V,U>
4885	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
4886	<	}
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);
4864	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4865	>	Function<Map.Entry<K,V>, ? extends U> transformer, Consumer<? super U> action) {
4866	>	super(p, b, i, f, t);
4867	>	this.transformer = transformer; this.action = action;
4868	>	}
4869	>	public final void compute() {
4870	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
4871	>	final Consumer<? super U> action;
4872	>	if ((transformer = this.transformer) != null &&
4873	>	(action = this.action) != null) {
4874	>	for (int i = baseIndex, f, h; batch > 0 &&
4875	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4876	>	addToPendingCount(1);
4877	>	new ForEachTransformedEntryTask<K,V,U>
4878	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4879	>	transformer, action).fork();
4880	>	}
4881	>	for (Node<K,V> p; (p = advance()) != null; ) {
4882	>	U u;
4883	>	if ((u = transformer.apply(p)) != null)
4884	>	action.accept(u);
4885	>	}
4886	>	propagateCompletion();
4887		}
5726	–	tryComplete(subtasks);
5727	–	return false;
4888		}
4889		}
4890
4891	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4892	<	extends BulkAction<K,V,Void> {
4893	<	final BiFun<? super K, ? super V, ? extends U> transformer;
4894	<	final Action<U> action;
4891	>	@SuppressWarnings("serial")
4892	>	static final class ForEachTransformedMappingTask<K,V,U>
4893	>	extends BulkTask<K,V,Void> {
4894	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
4895	>	final Consumer<? super U> action;
4896		ForEachTransformedMappingTask
4897	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4898	<	ForEachTransformedMappingTask<K,V,U> nextTask,
4899	<	BiFun<? super K, ? super V, ? extends U> transformer,
4900	<	Action<U> action) {
4901	<	super(m, p, b, nextTask);
4902	<	this.transformer = transformer;
4903	<	this.action = action;
4904	<
4905	<	}
4906	<	@SuppressWarnings("unchecked") public final boolean exec() {
4907	<	final BiFun<? super K, ? super V, ? extends U> transformer =
4908	<	this.transformer;
4909	<	final Action<U> action = this.action;
4910	<	if (transformer == null || action == null)
4911	<	return abortOnNullFunction();
4912	<	ForEachTransformedMappingTask<K,V,U> subtasks = null;
4913	<	try {
4914	<	int b = batch(), c;
4915	<	while (b > 1 && baseIndex != baseLimit) {
4916	<	do {} while (!casPending(c = pending, c+1));
4917	<	(subtasks = new ForEachTransformedMappingTask<K,V,U>
4918	<	(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);
4897	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4898	>	BiFunction<? super K, ? super V, ? extends U> transformer,
4899	>	Consumer<? super U> action) {
4900	>	super(p, b, i, f, t);
4901	>	this.transformer = transformer; this.action = action;
4902	>	}
4903	>	public final void compute() {
4904	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
4905	>	final Consumer<? super U> action;
4906	>	if ((transformer = this.transformer) != null &&
4907	>	(action = this.action) != null) {
4908	>	for (int i = baseIndex, f, h; batch > 0 &&
4909	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4910	>	addToPendingCount(1);
4911	>	new ForEachTransformedMappingTask<K,V,U>
4912	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4913	>	transformer, action).fork();
4914	>	}
4915	>	for (Node<K,V> p; (p = advance()) != null; ) {
4916	>	U u;
4917	>	if ((u = transformer.apply(p.key, p.val)) != null)
4918	>	action.accept(u);
4919		}
4920	<	} catch (Throwable ex) {
5765	<	return tryCompleteComputation(ex);
4920	>	propagateCompletion();
4921		}
5767	–	tryComplete(subtasks);
5768	–	return false;
4922		}
4923		}
4924
4925	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4926	<	extends BulkAction<K,V,U> {
4927	<	final Fun<? super K, ? extends U> searchFunction;
4925	>	@SuppressWarnings("serial")
4926	>	static final class SearchKeysTask<K,V,U>
4927	>	extends BulkTask<K,V,U> {
4928	>	final Function<? super K, ? extends U> searchFunction;
4929		final AtomicReference<U> result;
4930		SearchKeysTask
4931	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4932	<	SearchKeysTask<K,V,U> nextTask,
5779	<	Fun<? super K, ? extends U> searchFunction,
4931	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4932	>	Function<? super K, ? extends U> searchFunction,
4933		AtomicReference<U> result) {
4934	<	super(m, p, b, nextTask);
4934	>	super(p, b, i, f, t);
4935		this.searchFunction = searchFunction; this.result = result;
4936		}
4937	<	@SuppressWarnings("unchecked") public final boolean exec() {
4938	<	AtomicReference<U> result = this.result;
4939	<	final Fun<? super K, ? extends U> searchFunction =
4940	<	this.searchFunction;
4941	<	if (searchFunction == null || result == null)
4942	<	return abortOnNullFunction();
4943	<	SearchKeysTask<K,V,U> subtasks = null;
4944	<	try {
4945	<	int b = batch(), c;
4946	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
4947	<	do {} while (!casPending(c = pending, c+1));
4948	<	(subtasks = new SearchKeysTask<K,V,U>
4949	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
4950	<	}
4951	<	U u;
4952	<	while (result.get() == null && advance() != null) {
4953	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
4937	>	public final U getRawResult() { return result.get(); }
4938	>	public final void compute() {
4939	>	final Function<? super K, ? extends U> searchFunction;
4940	>	final AtomicReference<U> result;
4941	>	if ((searchFunction = this.searchFunction) != null &&
4942	>	(result = this.result) != null) {
4943	>	for (int i = baseIndex, f, h; batch > 0 &&
4944	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4945	>	if (result.get() != null)
4946	>	return;
4947	>	addToPendingCount(1);
4948	>	new SearchKeysTask<K,V,U>
4949	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4950	>	searchFunction, result).fork();
4951	>	}
4952	>	while (result.get() == null) {
4953	>	U u;
4954	>	Node<K,V> p;
4955	>	if ((p = advance()) == null) {
4956	>	propagateCompletion();
4957	>	break;
4958	>	}
4959	>	if ((u = searchFunction.apply(p.key)) != null) {
4960		if (result.compareAndSet(null, u))
4961	<	tryCompleteComputation(null);
4961	>	quietlyCompleteRoot();
4962		break;
4963		}
4964		}
5806	–	} catch (Throwable ex) {
5807	–	return tryCompleteComputation(ex);
4965		}
5809	–	tryComplete(subtasks);
5810	–	return false;
4966		}
5812	–	public final U getRawResult() { return result.get(); }
4967		}
4968
4969	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
4970	<	extends BulkAction<K,V,U> {
4971	<	final Fun<? super V, ? extends U> searchFunction;
4969	>	@SuppressWarnings("serial")
4970	>	static final class SearchValuesTask<K,V,U>
4971	>	extends BulkTask<K,V,U> {
4972	>	final Function<? super V, ? extends U> searchFunction;
4973		final AtomicReference<U> result;
4974		SearchValuesTask
4975	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
4976	<	SearchValuesTask<K,V,U> nextTask,
5822	<	Fun<? super V, ? extends U> searchFunction,
4975	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4976	>	Function<? super V, ? extends U> searchFunction,
4977		AtomicReference<U> result) {
4978	<	super(m, p, b, nextTask);
4978	>	super(p, b, i, f, t);
4979		this.searchFunction = searchFunction; this.result = result;
4980		}
4981	<	@SuppressWarnings("unchecked") public final boolean exec() {
4982	<	AtomicReference<U> result = this.result;
4983	<	final Fun<? super V, ? extends U> searchFunction =
4984	<	this.searchFunction;
4985	<	if (searchFunction == null || result == null)
4986	<	return abortOnNullFunction();
4987	<	SearchValuesTask<K,V,U> subtasks = null;
4988	<	try {
4989	<	int b = batch(), c;
4990	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
4991	<	do {} while (!casPending(c = pending, c+1));
4992	<	(subtasks = new SearchValuesTask<K,V,U>
4993	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
4994	<	}
4995	<	Object v; U u;
4996	<	while (result.get() == null && (v = advance()) != null) {
4997	<	if ((u = searchFunction.apply((V)v)) != null) {
4981	>	public final U getRawResult() { return result.get(); }
4982	>	public final void compute() {
4983	>	final Function<? super V, ? extends U> searchFunction;
4984	>	final AtomicReference<U> result;
4985	>	if ((searchFunction = this.searchFunction) != null &&
4986	>	(result = this.result) != null) {
4987	>	for (int i = baseIndex, f, h; batch > 0 &&
4988	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4989	>	if (result.get() != null)
4990	>	return;
4991	>	addToPendingCount(1);
4992	>	new SearchValuesTask<K,V,U>
4993	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4994	>	searchFunction, result).fork();
4995	>	}
4996	>	while (result.get() == null) {
4997	>	U u;
4998	>	Node<K,V> p;
4999	>	if ((p = advance()) == null) {
5000	>	propagateCompletion();
5001	>	break;
5002	>	}
5003	>	if ((u = searchFunction.apply(p.val)) != null) {
5004		if (result.compareAndSet(null, u))
5005	<	tryCompleteComputation(null);
5005	>	quietlyCompleteRoot();
5006		break;
5007		}
5008		}
5849	–	} catch (Throwable ex) {
5850	–	return tryCompleteComputation(ex);
5009		}
5852	–	tryComplete(subtasks);
5853	–	return false;
5010		}
5855	–	public final U getRawResult() { return result.get(); }
5011		}
5012
5013	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5014	<	extends BulkAction<K,V,U> {
5015	<	final Fun<Entry<K,V>, ? extends U> searchFunction;
5013	>	@SuppressWarnings("serial")
5014	>	static final class SearchEntriesTask<K,V,U>
5015	>	extends BulkTask<K,V,U> {
5016	>	final Function<Entry<K,V>, ? extends U> searchFunction;
5017		final AtomicReference<U> result;
5018		SearchEntriesTask
5019	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5020	<	SearchEntriesTask<K,V,U> nextTask,
5865	<	Fun<Entry<K,V>, ? extends U> searchFunction,
5019	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5020	>	Function<Entry<K,V>, ? extends U> searchFunction,
5021		AtomicReference<U> result) {
5022	<	super(m, p, b, nextTask);
5022	>	super(p, b, i, f, t);
5023		this.searchFunction = searchFunction; this.result = result;
5024		}
5025	<	@SuppressWarnings("unchecked") public final boolean exec() {
5026	<	AtomicReference<U> result = this.result;
5027	<	final Fun<Entry<K,V>, ? extends U> searchFunction =
5028	<	this.searchFunction;
5029	<	if (searchFunction == null || result == null)
5030	<	return abortOnNullFunction();
5031	<	SearchEntriesTask<K,V,U> subtasks = null;
5032	<	try {
5033	<	int b = batch(), c;
5034	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5035	<	do {} while (!casPending(c = pending, c+1));
5036	<	(subtasks = new SearchEntriesTask<K,V,U>
5037	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5038	<	}
5039	<	Object v; U u;
5040	<	while (result.get() == null && (v = advance()) != null) {
5041	<	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
5042	<	if (result.compareAndSet(null, u))
5043	<	tryCompleteComputation(null);
5025	>	public final U getRawResult() { return result.get(); }
5026	>	public final void compute() {
5027	>	final Function<Entry<K,V>, ? extends U> searchFunction;
5028	>	final AtomicReference<U> result;
5029	>	if ((searchFunction = this.searchFunction) != null &&
5030	>	(result = this.result) != null) {
5031	>	for (int i = baseIndex, f, h; batch > 0 &&
5032	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5033	>	if (result.get() != null)
5034	>	return;
5035	>	addToPendingCount(1);
5036	>	new SearchEntriesTask<K,V,U>
5037	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5038	>	searchFunction, result).fork();
5039	>	}
5040	>	while (result.get() == null) {
5041	>	U u;
5042	>	Node<K,V> p;
5043	>	if ((p = advance()) == null) {
5044	>	propagateCompletion();
5045		break;
5046		}
5047	+	if ((u = searchFunction.apply(p)) != null) {
5048	+	if (result.compareAndSet(null, u))
5049	+	quietlyCompleteRoot();
5050	+	return;
5051	+	}
5052		}
5892	–	} catch (Throwable ex) {
5893	–	return tryCompleteComputation(ex);
5053		}
5895	–	tryComplete(subtasks);
5896	–	return false;
5054		}
5898	–	public final U getRawResult() { return result.get(); }
5055		}
5056
5057	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5058	<	extends BulkAction<K,V,U> {
5059	<	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5057	>	@SuppressWarnings("serial")
5058	>	static final class SearchMappingsTask<K,V,U>
5059	>	extends BulkTask<K,V,U> {
5060	>	final BiFunction<? super K, ? super V, ? extends U> searchFunction;
5061		final AtomicReference<U> result;
5062		SearchMappingsTask
5063	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5064	<	SearchMappingsTask<K,V,U> nextTask,
5908	<	BiFun<? super K, ? super V, ? extends U> searchFunction,
5063	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5064	>	BiFunction<? super K, ? super V, ? extends U> searchFunction,
5065		AtomicReference<U> result) {
5066	<	super(m, p, b, nextTask);
5066	>	super(p, b, i, f, t);
5067		this.searchFunction = searchFunction; this.result = result;
5068		}
5069	<	@SuppressWarnings("unchecked") public final boolean exec() {
5070	<	AtomicReference<U> result = this.result;
5071	<	final BiFun<? super K, ? super V, ? extends U> searchFunction =
5072	<	this.searchFunction;
5073	<	if (searchFunction == null || result == null)
5074	<	return abortOnNullFunction();
5075	<	SearchMappingsTask<K,V,U> subtasks = null;
5076	<	try {
5077	<	int b = batch(), c;
5078	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5079	<	do {} while (!casPending(c = pending, c+1));
5080	<	(subtasks = new SearchMappingsTask<K,V,U>
5081	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5082	<	}
5083	<	Object v; U u;
5084	<	while (result.get() == null && (v = advance()) != null) {
5085	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5069	>	public final U getRawResult() { return result.get(); }
5070	>	public final void compute() {
5071	>	final BiFunction<? super K, ? super V, ? extends U> searchFunction;
5072	>	final AtomicReference<U> result;
5073	>	if ((searchFunction = this.searchFunction) != null &&
5074	>	(result = this.result) != null) {
5075	>	for (int i = baseIndex, f, h; batch > 0 &&
5076	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5077	>	if (result.get() != null)
5078	>	return;
5079	>	addToPendingCount(1);
5080	>	new SearchMappingsTask<K,V,U>
5081	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5082	>	searchFunction, result).fork();
5083	>	}
5084	>	while (result.get() == null) {
5085	>	U u;
5086	>	Node<K,V> p;
5087	>	if ((p = advance()) == null) {
5088	>	propagateCompletion();
5089	>	break;
5090	>	}
5091	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5092		if (result.compareAndSet(null, u))
5093	<	tryCompleteComputation(null);
5093	>	quietlyCompleteRoot();
5094		break;
5095		}
5096		}
5935	–	} catch (Throwable ex) {
5936	–	return tryCompleteComputation(ex);
5097		}
5938	–	tryComplete(subtasks);
5939	–	return false;
5098		}
5941	–	public final U getRawResult() { return result.get(); }
5099		}
5100
5101	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5101	>	@SuppressWarnings("serial")
5102	>	static final class ReduceKeysTask<K,V>
5103		extends BulkTask<K,V,K> {
5104	<	final BiFun<? super K, ? super K, ? extends K> reducer;
5104	>	final BiFunction<? super K, ? super K, ? extends K> reducer;
5105		K result;
5106		ReduceKeysTask<K,V> rights, nextRight;
5107		ReduceKeysTask
5108	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5108	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5109		ReduceKeysTask<K,V> nextRight,
5110	<	BiFun<? super K, ? super K, ? extends K> reducer) {
5111	<	super(m, p, b); this.nextRight = nextRight;
5110	>	BiFunction<? super K, ? super K, ? extends K> reducer) {
5111	>	super(p, b, i, f, t); this.nextRight = nextRight;
5112		this.reducer = reducer;
5113		}
5114	<	@SuppressWarnings("unchecked") public final boolean exec() {
5115	<	final BiFun<? super K, ? super K, ? extends K> reducer =
5116	<	this.reducer;
5117	<	if (reducer == null)
5118	<	return abortOnNullFunction();
5119	<	try {
5120	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5963	<	do {} while (!casPending(c = pending, c+1));
5114	>	public final K getRawResult() { return result; }
5115	>	public final void compute() {
5116	>	final BiFunction<? super K, ? super K, ? extends K> reducer;
5117	>	if ((reducer = this.reducer) != null) {
5118	>	for (int i = baseIndex, f, h; batch > 0 &&
5119	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5120	>	addToPendingCount(1);
5121		(rights = new ReduceKeysTask<K,V>
5122	<	(map, this, b >>>= 1, rights, reducer)).fork();
5122	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5123	>	rights, reducer)).fork();
5124		}
5125		K r = null;
5126	<	while (advance() != null) {
5127	<	K u = (K)nextKey;
5128	<	r = (r == null) ? u : reducer.apply(r, u);
5126	>	for (Node<K,V> p; (p = advance()) != null; ) {
5127	>	K u = p.key;
5128	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5129		}
5130		result = r;
5131	<	for (ReduceKeysTask<K,V> t = this, s;;) {
5132	<	int c; BulkTask<K,V,?> par; K tr, sr;
5133	<	if ((c = t.pending) == 0) {
5134	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5135	<	if ((sr = s.result) != null)
5136	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5137	<	}
5138	<	if ((par = t.parent) == null ||
5139	<	!(par instanceof ReduceKeysTask)) {
5140	<	t.quietlyComplete();
5141	<	break;
5984	<	}
5985	<	t = (ReduceKeysTask<K,V>)par;
5131	>	CountedCompleter<?> c;
5132	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5133	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5134	>	t = (ReduceKeysTask<K,V>)c,
5135	>	s = t.rights;
5136	>	while (s != null) {
5137	>	K tr, sr;
5138	>	if ((sr = s.result) != null)
5139	>	t.result = (((tr = t.result) == null) ? sr :
5140	>	reducer.apply(tr, sr));
5141	>	s = t.rights = s.nextRight;
5142		}
5987	–	else if (t.casPending(c, c - 1))
5988	–	break;
5143		}
5990	–	} catch (Throwable ex) {
5991	–	return tryCompleteComputation(ex);
5144		}
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;
5145		}
6002	–	public final K getRawResult() { return result; }
5146		}
5147
5148	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5148	>	@SuppressWarnings("serial")
5149	>	static final class ReduceValuesTask<K,V>
5150		extends BulkTask<K,V,V> {
5151	<	final BiFun<? super V, ? super V, ? extends V> reducer;
5151	>	final BiFunction<? super V, ? super V, ? extends V> reducer;
5152		V result;
5153		ReduceValuesTask<K,V> rights, nextRight;
5154		ReduceValuesTask
5155	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5155	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5156		ReduceValuesTask<K,V> nextRight,
5157	<	BiFun<? super V, ? super V, ? extends V> reducer) {
5158	<	super(m, p, b); this.nextRight = nextRight;
5157	>	BiFunction<? super V, ? super V, ? extends V> reducer) {
5158	>	super(p, b, i, f, t); this.nextRight = nextRight;
5159		this.reducer = reducer;
5160		}
5161	<	@SuppressWarnings("unchecked") public final boolean exec() {
5162	<	final BiFun<? super V, ? super V, ? extends V> reducer =
5163	<	this.reducer;
5164	<	if (reducer == null)
5165	<	return abortOnNullFunction();
5166	<	try {
5167	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6024	<	do {} while (!casPending(c = pending, c+1));
5161	>	public final V getRawResult() { return result; }
5162	>	public final void compute() {
5163	>	final BiFunction<? super V, ? super V, ? extends V> reducer;
5164	>	if ((reducer = this.reducer) != null) {
5165	>	for (int i = baseIndex, f, h; batch > 0 &&
5166	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5167	>	addToPendingCount(1);
5168		(rights = new ReduceValuesTask<K,V>
5169	<	(map, this, b >>>= 1, rights, reducer)).fork();
5169	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5170	>	rights, reducer)).fork();
5171		}
5172		V r = null;
5173	<	Object v;
5174	<	while ((v = advance()) != null) {
5175	<	V u = (V)v;
6032	<	r = (r == null) ? u : reducer.apply(r, u);
5173	>	for (Node<K,V> p; (p = advance()) != null; ) {
5174	>	V v = p.val;
5175	>	r = (r == null) ? v : reducer.apply(r, v);
5176		}
5177		result = r;
5178	<	for (ReduceValuesTask<K,V> t = this, s;;) {
5179	<	int c; BulkTask<K,V,?> par; V tr, sr;
5180	<	if ((c = t.pending) == 0) {
5181	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5182	<	if ((sr = s.result) != null)
5183	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5184	<	}
5185	<	if ((par = t.parent) == null ||
5186	<	!(par instanceof ReduceValuesTask)) {
5187	<	t.quietlyComplete();
5188	<	break;
6046	<	}
6047	<	t = (ReduceValuesTask<K,V>)par;
5178	>	CountedCompleter<?> c;
5179	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5180	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5181	>	t = (ReduceValuesTask<K,V>)c,
5182	>	s = t.rights;
5183	>	while (s != null) {
5184	>	V tr, sr;
5185	>	if ((sr = s.result) != null)
5186	>	t.result = (((tr = t.result) == null) ? sr :
5187	>	reducer.apply(tr, sr));
5188	>	s = t.rights = s.nextRight;
5189		}
6049	–	else if (t.casPending(c, c - 1))
6050	–	break;
5190		}
6052	–	} catch (Throwable ex) {
6053	–	return tryCompleteComputation(ex);
6054	–	}
6055	–	ReduceValuesTask<K,V> s = rights;
6056	–	if (s != null && !inForkJoinPool()) {
6057	–	do  {
6058	–	if (s.tryUnfork())
6059	–	s.exec();
6060	–	} while ((s = s.nextRight) != null);
5191		}
6062	–	return false;
5192		}
6064	–	public final V getRawResult() { return result; }
5193		}
5194
5195	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5195	>	@SuppressWarnings("serial")
5196	>	static final class ReduceEntriesTask<K,V>
5197		extends BulkTask<K,V,Map.Entry<K,V>> {
5198	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5198	>	final BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5199		Map.Entry<K,V> result;
5200		ReduceEntriesTask<K,V> rights, nextRight;
5201		ReduceEntriesTask
5202	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5202	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5203		ReduceEntriesTask<K,V> nextRight,
5204	<	BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5205	<	super(m, p, b); this.nextRight = nextRight;
5204	>	BiFunction<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5205	>	super(p, b, i, f, t); this.nextRight = nextRight;
5206		this.reducer = reducer;
5207		}
5208	<	@SuppressWarnings("unchecked") public final boolean exec() {
5209	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5210	<	this.reducer;
5211	<	if (reducer == null)
5212	<	return abortOnNullFunction();
5213	<	try {
5214	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6086	<	do {} while (!casPending(c = pending, c+1));
5208	>	public final Map.Entry<K,V> getRawResult() { return result; }
5209	>	public final void compute() {
5210	>	final BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5211	>	if ((reducer = this.reducer) != null) {
5212	>	for (int i = baseIndex, f, h; batch > 0 &&
5213	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5214	>	addToPendingCount(1);
5215		(rights = new ReduceEntriesTask<K,V>
5216	<	(map, this, b >>>= 1, rights, reducer)).fork();
5216	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5217	>	rights, reducer)).fork();
5218		}
5219		Map.Entry<K,V> r = null;
5220	<	Object v;
5221	<	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	<	}
5220	>	for (Node<K,V> p; (p = advance()) != null; )
5221	>	r = (r == null) ? p : reducer.apply(r, p);
5222		result = r;
5223	<	for (ReduceEntriesTask<K,V> t = this, s;;) {
5224	<	int c; BulkTask<K,V,?> par; Map.Entry<K,V> tr, sr;
5225	<	if ((c = t.pending) == 0) {
5226	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5227	<	if ((sr = s.result) != null)
5228	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5229	<	}
5230	<	if ((par = t.parent) == null ||
5231	<	!(par instanceof ReduceEntriesTask)) {
5232	<	t.quietlyComplete();
5233	<	break;
6108	<	}
6109	<	t = (ReduceEntriesTask<K,V>)par;
5223	>	CountedCompleter<?> c;
5224	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5225	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5226	>	t = (ReduceEntriesTask<K,V>)c,
5227	>	s = t.rights;
5228	>	while (s != null) {
5229	>	Map.Entry<K,V> tr, sr;
5230	>	if ((sr = s.result) != null)
5231	>	t.result = (((tr = t.result) == null) ? sr :
5232	>	reducer.apply(tr, sr));
5233	>	s = t.rights = s.nextRight;
5234		}
6111	–	else if (t.casPending(c, c - 1))
6112	–	break;
5235		}
6114	–	} catch (Throwable ex) {
6115	–	return tryCompleteComputation(ex);
5236		}
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;
5237		}
6126	–	public final Map.Entry<K,V> getRawResult() { return result; }
5238		}
5239
5240	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5240	>	@SuppressWarnings("serial")
5241	>	static final class MapReduceKeysTask<K,V,U>
5242		extends BulkTask<K,V,U> {
5243	<	final Fun<? super K, ? extends U> transformer;
5244	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5243	>	final Function<? super K, ? extends U> transformer;
5244	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5245		U result;
5246		MapReduceKeysTask<K,V,U> rights, nextRight;
5247		MapReduceKeysTask
5248	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5248	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5249		MapReduceKeysTask<K,V,U> nextRight,
5250	<	Fun<? super K, ? extends U> transformer,
5251	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5252	<	super(m, p, b); this.nextRight = nextRight;
5250	>	Function<? super K, ? extends U> transformer,
5251	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5252	>	super(p, b, i, f, t); this.nextRight = nextRight;
5253		this.transformer = transformer;
5254		this.reducer = reducer;
5255		}
5256	<	@SuppressWarnings("unchecked") public final boolean exec() {
5257	<	final Fun<? super K, ? extends U> transformer =
5258	<	this.transformer;
5259	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5260	<	this.reducer;
5261	<	if (transformer == null || reducer == null)
5262	<	return abortOnNullFunction();
5263	<	try {
5264	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6153	<	do {} while (!casPending(c = pending, c+1));
5256	>	public final U getRawResult() { return result; }
5257	>	public final void compute() {
5258	>	final Function<? super K, ? extends U> transformer;
5259	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5260	>	if ((transformer = this.transformer) != null &&
5261	>	(reducer = this.reducer) != null) {
5262	>	for (int i = baseIndex, f, h; batch > 0 &&
5263	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5264	>	addToPendingCount(1);
5265		(rights = new MapReduceKeysTask<K,V,U>
5266	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5266	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5267	>	rights, transformer, reducer)).fork();
5268		}
5269	<	U r = null, u;
5270	<	while (advance() != null) {
5271	<	if ((u = transformer.apply((K)nextKey)) != null)
5269	>	U r = null;
5270	>	for (Node<K,V> p; (p = advance()) != null; ) {
5271	>	U u;
5272	>	if ((u = transformer.apply(p.key)) != null)
5273		r = (r == null) ? u : reducer.apply(r, u);
5274		}
5275		result = r;
5276	<	for (MapReduceKeysTask<K,V,U> t = this, s;;) {
5277	<	int c; BulkTask<K,V,?> par; U tr, sr;
5278	<	if ((c = t.pending) == 0) {
5279	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5280	<	if ((sr = s.result) != null)
5281	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5282	<	}
5283	<	if ((par = t.parent) == null ||
5284	<	!(par instanceof MapReduceKeysTask)) {
5285	<	t.quietlyComplete();
5286	<	break;
6174	<	}
6175	<	t = (MapReduceKeysTask<K,V,U>)par;
5276	>	CountedCompleter<?> c;
5277	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5278	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5279	>	t = (MapReduceKeysTask<K,V,U>)c,
5280	>	s = t.rights;
5281	>	while (s != null) {
5282	>	U tr, sr;
5283	>	if ((sr = s.result) != null)
5284	>	t.result = (((tr = t.result) == null) ? sr :
5285	>	reducer.apply(tr, sr));
5286	>	s = t.rights = s.nextRight;
5287		}
6177	–	else if (t.casPending(c, c - 1))
6178	–	break;
5288		}
6180	–	} catch (Throwable ex) {
6181	–	return tryCompleteComputation(ex);
6182	–	}
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);
5289		}
6190	–	return false;
5290		}
6192	–	public final U getRawResult() { return result; }
5291		}
5292
5293	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5293	>	@SuppressWarnings("serial")
5294	>	static final class MapReduceValuesTask<K,V,U>
5295		extends BulkTask<K,V,U> {
5296	<	final Fun<? super V, ? extends U> transformer;
5297	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5296	>	final Function<? super V, ? extends U> transformer;
5297	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5298		U result;
5299		MapReduceValuesTask<K,V,U> rights, nextRight;
5300		MapReduceValuesTask
5301	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5301	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5302		MapReduceValuesTask<K,V,U> nextRight,
5303	<	Fun<? super V, ? extends U> transformer,
5304	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5305	<	super(m, p, b); this.nextRight = nextRight;
5303	>	Function<? super V, ? extends U> transformer,
5304	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5305	>	super(p, b, i, f, t); this.nextRight = nextRight;
5306		this.transformer = transformer;
5307		this.reducer = reducer;
5308		}
5309	<	@SuppressWarnings("unchecked") public final boolean exec() {
5310	<	final Fun<? super V, ? extends U> transformer =
5311	<	this.transformer;
5312	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5313	<	this.reducer;
5314	<	if (transformer == null || reducer == null)
5315	<	return abortOnNullFunction();
5316	<	try {
5317	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6219	<	do {} while (!casPending(c = pending, c+1));
5309	>	public final U getRawResult() { return result; }
5310	>	public final void compute() {
5311	>	final Function<? super V, ? extends U> transformer;
5312	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5313	>	if ((transformer = this.transformer) != null &&
5314	>	(reducer = this.reducer) != null) {
5315	>	for (int i = baseIndex, f, h; batch > 0 &&
5316	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5317	>	addToPendingCount(1);
5318		(rights = new MapReduceValuesTask<K,V,U>
5319	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5319	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5320	>	rights, transformer, reducer)).fork();
5321		}
5322	<	U r = null, u;
5323	<	Object v;
5324	<	while ((v = advance()) != null) {
5325	<	if ((u = transformer.apply((V)v)) != null)
5322	>	U r = null;
5323	>	for (Node<K,V> p; (p = advance()) != null; ) {
5324	>	U u;
5325	>	if ((u = transformer.apply(p.val)) != null)
5326		r = (r == null) ? u : reducer.apply(r, u);
5327		}
5328		result = r;
5329	<	for (MapReduceValuesTask<K,V,U> t = this, s;;) {
5330	<	int c; BulkTask<K,V,?> par; U tr, sr;
5331	<	if ((c = t.pending) == 0) {
5332	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5333	<	if ((sr = s.result) != null)
5334	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5335	<	}
5336	<	if ((par = t.parent) == null ||
5337	<	!(par instanceof MapReduceValuesTask)) {
5338	<	t.quietlyComplete();
5339	<	break;
6241	<	}
6242	<	t = (MapReduceValuesTask<K,V,U>)par;
5329	>	CountedCompleter<?> c;
5330	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5331	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5332	>	t = (MapReduceValuesTask<K,V,U>)c,
5333	>	s = t.rights;
5334	>	while (s != null) {
5335	>	U tr, sr;
5336	>	if ((sr = s.result) != null)
5337	>	t.result = (((tr = t.result) == null) ? sr :
5338	>	reducer.apply(tr, sr));
5339	>	s = t.rights = s.nextRight;
5340		}
6244	–	else if (t.casPending(c, c - 1))
6245	–	break;
5341		}
6247	–	} catch (Throwable ex) {
6248	–	return tryCompleteComputation(ex);
5342		}
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);
6256	–	}
6257	–	return false;
5343		}
6259	–	public final U getRawResult() { return result; }
5344		}
5345
5346	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5346	>	@SuppressWarnings("serial")
5347	>	static final class MapReduceEntriesTask<K,V,U>
5348		extends BulkTask<K,V,U> {
5349	<	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5350	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5349	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
5350	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5351		U result;
5352		MapReduceEntriesTask<K,V,U> rights, nextRight;
5353		MapReduceEntriesTask
5354	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5354	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5355		MapReduceEntriesTask<K,V,U> nextRight,
5356	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5357	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5358	<	super(m, p, b); this.nextRight = nextRight;
5356	>	Function<Map.Entry<K,V>, ? extends U> transformer,
5357	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5358	>	super(p, b, i, f, t); this.nextRight = nextRight;
5359		this.transformer = transformer;
5360		this.reducer = reducer;
5361		}
5362	<	@SuppressWarnings("unchecked") public final boolean exec() {
5363	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5364	<	this.transformer;
5365	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5366	<	this.reducer;
5367	<	if (transformer == null || reducer == null)
5368	<	return abortOnNullFunction();
5369	<	try {
5370	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6286	<	do {} while (!casPending(c = pending, c+1));
5362	>	public final U getRawResult() { return result; }
5363	>	public final void compute() {
5364	>	final Function<Map.Entry<K,V>, ? extends U> transformer;
5365	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5366	>	if ((transformer = this.transformer) != null &&
5367	>	(reducer = this.reducer) != null) {
5368	>	for (int i = baseIndex, f, h; batch > 0 &&
5369	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5370	>	addToPendingCount(1);
5371		(rights = new MapReduceEntriesTask<K,V,U>
5372	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5372	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5373	>	rights, transformer, reducer)).fork();
5374		}
5375	<	U r = null, u;
5376	<	Object v;
5377	<	while ((v = advance()) != null) {
5378	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5375	>	U r = null;
5376	>	for (Node<K,V> p; (p = advance()) != null; ) {
5377	>	U u;
5378	>	if ((u = transformer.apply(p)) != null)
5379		r = (r == null) ? u : reducer.apply(r, u);
5380		}
5381		result = r;
5382	<	for (MapReduceEntriesTask<K,V,U> t = this, s;;) {
5383	<	int c; BulkTask<K,V,?> par; U tr, sr;
5384	<	if ((c = t.pending) == 0) {
5385	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5386	<	if ((sr = s.result) != null)
5387	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5388	<	}
5389	<	if ((par = t.parent) == null ||
5390	<	!(par instanceof MapReduceEntriesTask)) {
5391	<	t.quietlyComplete();
5392	<	break;
6308	<	}
6309	<	t = (MapReduceEntriesTask<K,V,U>)par;
5382	>	CountedCompleter<?> c;
5383	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5384	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5385	>	t = (MapReduceEntriesTask<K,V,U>)c,
5386	>	s = t.rights;
5387	>	while (s != null) {
5388	>	U tr, sr;
5389	>	if ((sr = s.result) != null)
5390	>	t.result = (((tr = t.result) == null) ? sr :
5391	>	reducer.apply(tr, sr));
5392	>	s = t.rights = s.nextRight;
5393		}
6311	–	else if (t.casPending(c, c - 1))
6312	–	break;
5394		}
6314	–	} catch (Throwable ex) {
6315	–	return tryCompleteComputation(ex);
5395		}
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);
6323	–	}
6324	–	return false;
5396		}
6326	–	public final U getRawResult() { return result; }
5397		}
5398
5399	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5399	>	@SuppressWarnings("serial")
5400	>	static final class MapReduceMappingsTask<K,V,U>
5401		extends BulkTask<K,V,U> {
5402	<	final BiFun<? super K, ? super V, ? extends U> transformer;
5403	<	final BiFun<? super U, ? super U, ? extends U> reducer;
5402	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
5403	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5404		U result;
5405		MapReduceMappingsTask<K,V,U> rights, nextRight;
5406		MapReduceMappingsTask
5407	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5407	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5408		MapReduceMappingsTask<K,V,U> nextRight,
5409	<	BiFun<? super K, ? super V, ? extends U> transformer,
5410	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5411	<	super(m, p, b); this.nextRight = nextRight;
5409	>	BiFunction<? super K, ? super V, ? extends U> transformer,
5410	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
5411	>	super(p, b, i, f, t); this.nextRight = nextRight;
5412		this.transformer = transformer;
5413		this.reducer = reducer;
5414		}
5415	<	@SuppressWarnings("unchecked") public final boolean exec() {
5416	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5417	<	this.transformer;
5418	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5419	<	this.reducer;
5420	<	if (transformer == null || reducer == null)
5421	<	return abortOnNullFunction();
5422	<	try {
5423	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6353	<	do {} while (!casPending(c = pending, c+1));
5415	>	public final U getRawResult() { return result; }
5416	>	public final void compute() {
5417	>	final BiFunction<? super K, ? super V, ? extends U> transformer;
5418	>	final BiFunction<? super U, ? super U, ? extends U> reducer;
5419	>	if ((transformer = this.transformer) != null &&
5420	>	(reducer = this.reducer) != null) {
5421	>	for (int i = baseIndex, f, h; batch > 0 &&
5422	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5423	>	addToPendingCount(1);
5424		(rights = new MapReduceMappingsTask<K,V,U>
5425	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5425	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5426	>	rights, transformer, reducer)).fork();
5427		}
5428	<	U r = null, u;
5429	<	Object v;
5430	<	while ((v = advance()) != null) {
5431	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5428	>	U r = null;
5429	>	for (Node<K,V> p; (p = advance()) != null; ) {
5430	>	U u;
5431	>	if ((u = transformer.apply(p.key, p.val)) != null)
5432		r = (r == null) ? u : reducer.apply(r, u);
5433		}
5434		result = r;
5435	<	for (MapReduceMappingsTask<K,V,U> t = this, s;;) {
5436	<	int c; BulkTask<K,V,?> par; U tr, sr;
5437	<	if ((c = t.pending) == 0) {
5438	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5439	<	if ((sr = s.result) != null)
5440	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5441	<	}
5442	<	if ((par = t.parent) == null ||
5443	<	!(par instanceof MapReduceMappingsTask)) {
5444	<	t.quietlyComplete();
5445	<	break;
6375	<	}
6376	<	t = (MapReduceMappingsTask<K,V,U>)par;
5435	>	CountedCompleter<?> c;
5436	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5437	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5438	>	t = (MapReduceMappingsTask<K,V,U>)c,
5439	>	s = t.rights;
5440	>	while (s != null) {
5441	>	U tr, sr;
5442	>	if ((sr = s.result) != null)
5443	>	t.result = (((tr = t.result) == null) ? sr :
5444	>	reducer.apply(tr, sr));
5445	>	s = t.rights = s.nextRight;
5446		}
6378	–	else if (t.casPending(c, c - 1))
6379	–	break;
5447		}
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);
5448		}
6391	–	return false;
5449		}
6393	–	public final U getRawResult() { return result; }
5450		}
5451
5452	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5452	>	@SuppressWarnings("serial")
5453	>	static final class MapReduceKeysToDoubleTask<K,V>
5454		extends BulkTask<K,V,Double> {
5455	<	final ObjectToDouble<? super K> transformer;
5456	<	final DoubleByDoubleToDouble reducer;
5455	>	final ToDoubleFunction<? super K> transformer;
5456	>	final DoubleBinaryOperator reducer;
5457		final double basis;
5458		double result;
5459		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5460		MapReduceKeysToDoubleTask
5461	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5461	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5462		MapReduceKeysToDoubleTask<K,V> nextRight,
5463	<	ObjectToDouble<? super K> transformer,
5463	>	ToDoubleFunction<? super K> transformer,
5464		double basis,
5465	<	DoubleByDoubleToDouble reducer) {
5466	<	super(m, p, b); this.nextRight = nextRight;
5465	>	DoubleBinaryOperator reducer) {
5466	>	super(p, b, i, f, t); this.nextRight = nextRight;
5467		this.transformer = transformer;
5468		this.basis = basis; this.reducer = reducer;
5469		}
5470	<	@SuppressWarnings("unchecked") public final boolean exec() {
5471	<	final ObjectToDouble<? super K> transformer =
5472	<	this.transformer;
5473	<	final DoubleByDoubleToDouble reducer = this.reducer;
5474	<	if (transformer == null || reducer == null)
5475	<	return abortOnNullFunction();
5476	<	try {
5477	<	final double id = this.basis;
5478	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5479	<	do {} while (!casPending(c = pending, c+1));
5470	>	public final Double getRawResult() { return result; }
5471	>	public final void compute() {
5472	>	final ToDoubleFunction<? super K> transformer;
5473	>	final DoubleBinaryOperator reducer;
5474	>	if ((transformer = this.transformer) != null &&
5475	>	(reducer = this.reducer) != null) {
5476	>	double r = this.basis;
5477	>	for (int i = baseIndex, f, h; batch > 0 &&
5478	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5479	>	addToPendingCount(1);
5480		(rights = new MapReduceKeysToDoubleTask<K,V>
5481	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5481	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5482	>	rights, transformer, r, reducer)).fork();
5483		}
5484	<	double r = id;
5485	<	while (advance() != null)
6428	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5484	>	for (Node<K,V> p; (p = advance()) != null; )
5485	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.key));
5486		result = r;
5487	<	for (MapReduceKeysToDoubleTask<K,V> t = this, s;;) {
5488	<	int c; BulkTask<K,V,?> par;
5489	<	if ((c = t.pending) == 0) {
5490	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5491	<	t.result = reducer.apply(t.result, s.result);
5492	<	}
5493	<	if ((par = t.parent) == null ||
5494	<	!(par instanceof MapReduceKeysToDoubleTask)) {
6438	<	t.quietlyComplete();
6439	<	break;
6440	<	}
6441	<	t = (MapReduceKeysToDoubleTask<K,V>)par;
5487	>	CountedCompleter<?> c;
5488	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5489	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5490	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5491	>	s = t.rights;
5492	>	while (s != null) {
5493	>	t.result = reducer.applyAsDouble(t.result, s.result);
5494	>	s = t.rights = s.nextRight;
5495		}
6443	–	else if (t.casPending(c, c - 1))
6444	–	break;
5496		}
6446	–	} catch (Throwable ex) {
6447	–	return tryCompleteComputation(ex);
6448	–	}
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);
5497		}
6456	–	return false;
5498		}
6458	–	public final Double getRawResult() { return result; }
5499		}
5500
5501	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5501	>	@SuppressWarnings("serial")
5502	>	static final class MapReduceValuesToDoubleTask<K,V>
5503		extends BulkTask<K,V,Double> {
5504	<	final ObjectToDouble<? super V> transformer;
5505	<	final DoubleByDoubleToDouble reducer;
5504	>	final ToDoubleFunction<? super V> transformer;
5505	>	final DoubleBinaryOperator reducer;
5506		final double basis;
5507		double result;
5508		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5509		MapReduceValuesToDoubleTask
5510	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5510	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5511		MapReduceValuesToDoubleTask<K,V> nextRight,
5512	<	ObjectToDouble<? super V> transformer,
5512	>	ToDoubleFunction<? super V> transformer,
5513		double basis,
5514	<	DoubleByDoubleToDouble reducer) {
5515	<	super(m, p, b); this.nextRight = nextRight;
5514	>	DoubleBinaryOperator reducer) {
5515	>	super(p, b, i, f, t); this.nextRight = nextRight;
5516		this.transformer = transformer;
5517		this.basis = basis; this.reducer = reducer;
5518		}
5519	<	@SuppressWarnings("unchecked") public final boolean exec() {
5520	<	final ObjectToDouble<? super V> transformer =
5521	<	this.transformer;
5522	<	final DoubleByDoubleToDouble reducer = this.reducer;
5523	<	if (transformer == null || reducer == null)
5524	<	return abortOnNullFunction();
5525	<	try {
5526	<	final double id = this.basis;
5527	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5528	<	do {} while (!casPending(c = pending, c+1));
5519	>	public final Double getRawResult() { return result; }
5520	>	public final void compute() {
5521	>	final ToDoubleFunction<? super V> transformer;
5522	>	final DoubleBinaryOperator reducer;
5523	>	if ((transformer = this.transformer) != null &&
5524	>	(reducer = this.reducer) != null) {
5525	>	double r = this.basis;
5526	>	for (int i = baseIndex, f, h; batch > 0 &&
5527	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5528	>	addToPendingCount(1);
5529		(rights = new MapReduceValuesToDoubleTask<K,V>
5530	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5530	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5531	>	rights, transformer, r, reducer)).fork();
5532		}
5533	<	double r = id;
5534	<	Object v;
6493	<	while ((v = advance()) != null)
6494	<	r = reducer.apply(r, transformer.apply((V)v));
5533	>	for (Node<K,V> p; (p = advance()) != null; )
5534	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.val));
5535		result = r;
5536	<	for (MapReduceValuesToDoubleTask<K,V> t = this, s;;) {
5537	<	int c; BulkTask<K,V,?> par;
5538	<	if ((c = t.pending) == 0) {
5539	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5540	<	t.result = reducer.apply(t.result, s.result);
5541	<	}
5542	<	if ((par = t.parent) == null ||
5543	<	!(par instanceof MapReduceValuesToDoubleTask)) {
6504	<	t.quietlyComplete();
6505	<	break;
6506	<	}
6507	<	t = (MapReduceValuesToDoubleTask<K,V>)par;
5536	>	CountedCompleter<?> c;
5537	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5538	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5539	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5540	>	s = t.rights;
5541	>	while (s != null) {
5542	>	t.result = reducer.applyAsDouble(t.result, s.result);
5543	>	s = t.rights = s.nextRight;
5544		}
6509	–	else if (t.casPending(c, c - 1))
6510	–	break;
5545		}
6512	–	} catch (Throwable ex) {
6513	–	return tryCompleteComputation(ex);
6514	–	}
6515	–	MapReduceValuesToDoubleTask<K,V> s = rights;
6516	–	if (s != null && !inForkJoinPool()) {
6517	–	do  {
6518	–	if (s.tryUnfork())
6519	–	s.exec();
6520	–	} while ((s = s.nextRight) != null);
5546		}
6522	–	return false;
5547		}
6524	–	public final Double getRawResult() { return result; }
5548		}
5549
5550	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5550	>	@SuppressWarnings("serial")
5551	>	static final class MapReduceEntriesToDoubleTask<K,V>
5552		extends BulkTask<K,V,Double> {
5553	<	final ObjectToDouble<Map.Entry<K,V>> transformer;
5554	<	final DoubleByDoubleToDouble reducer;
5553	>	final ToDoubleFunction<Map.Entry<K,V>> transformer;
5554	>	final DoubleBinaryOperator reducer;
5555		final double basis;
5556		double result;
5557		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5558		MapReduceEntriesToDoubleTask
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		MapReduceEntriesToDoubleTask<K,V> nextRight,
5561	<	ObjectToDouble<Map.Entry<K,V>> transformer,
5561	>	ToDoubleFunction<Map.Entry<K,V>> transformer,
5562		double basis,
5563	<	DoubleByDoubleToDouble reducer) {
5564	<	super(m, p, b); this.nextRight = nextRight;
5563	>	DoubleBinaryOperator reducer) {
5564	>	super(p, b, i, f, t); this.nextRight = nextRight;
5565		this.transformer = transformer;
5566		this.basis = basis; this.reducer = reducer;
5567		}
5568	<	@SuppressWarnings("unchecked") public final boolean exec() {
5569	<	final ObjectToDouble<Map.Entry<K,V>> transformer =
5570	<	this.transformer;
5571	<	final DoubleByDoubleToDouble reducer = this.reducer;
5572	<	if (transformer == null || reducer == null)
5573	<	return abortOnNullFunction();
5574	<	try {
5575	<	final double id = this.basis;
5576	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5577	<	do {} while (!casPending(c = pending, c+1));
5568	>	public final Double getRawResult() { return result; }
5569	>	public final void compute() {
5570	>	final ToDoubleFunction<Map.Entry<K,V>> transformer;
5571	>	final DoubleBinaryOperator reducer;
5572	>	if ((transformer = this.transformer) != null &&
5573	>	(reducer = this.reducer) != null) {
5574	>	double r = this.basis;
5575	>	for (int i = baseIndex, f, h; batch > 0 &&
5576	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5577	>	addToPendingCount(1);
5578		(rights = new MapReduceEntriesToDoubleTask<K,V>
5579	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5579	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5580	>	rights, transformer, r, reducer)).fork();
5581		}
5582	<	double r = id;
5583	<	Object v;
6559	<	while ((v = advance()) != null)
6560	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5582	>	for (Node<K,V> p; (p = advance()) != null; )
5583	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p));
5584		result = r;
5585	<	for (MapReduceEntriesToDoubleTask<K,V> t = this, s;;) {
5586	<	int c; BulkTask<K,V,?> par;
5587	<	if ((c = t.pending) == 0) {
5588	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5589	<	t.result = reducer.apply(t.result, s.result);
5590	<	}
5591	<	if ((par = t.parent) == null ||
5592	<	!(par instanceof MapReduceEntriesToDoubleTask)) {
6570	<	t.quietlyComplete();
6571	<	break;
6572	<	}
6573	<	t = (MapReduceEntriesToDoubleTask<K,V>)par;
5585	>	CountedCompleter<?> c;
5586	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5587	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5588	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5589	>	s = t.rights;
5590	>	while (s != null) {
5591	>	t.result = reducer.applyAsDouble(t.result, s.result);
5592	>	s = t.rights = s.nextRight;
5593		}
6575	–	else if (t.casPending(c, c - 1))
6576	–	break;
5594		}
6578	–	} catch (Throwable ex) {
6579	–	return tryCompleteComputation(ex);
5595		}
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;
5596		}
6590	–	public final Double getRawResult() { return result; }
5597		}
5598
5599	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5599	>	@SuppressWarnings("serial")
5600	>	static final class MapReduceMappingsToDoubleTask<K,V>
5601		extends BulkTask<K,V,Double> {
5602	<	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5603	<	final DoubleByDoubleToDouble reducer;
5602	>	final ToDoubleBiFunction<? super K, ? super V> transformer;
5603	>	final DoubleBinaryOperator reducer;
5604		final double basis;
5605		double result;
5606		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5607		MapReduceMappingsToDoubleTask
5608	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5608	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5609		MapReduceMappingsToDoubleTask<K,V> nextRight,
5610	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
5610	>	ToDoubleBiFunction<? super K, ? super V> transformer,
5611		double basis,
5612	<	DoubleByDoubleToDouble reducer) {
5613	<	super(m, p, b); this.nextRight = nextRight;
5612	>	DoubleBinaryOperator reducer) {
5613	>	super(p, b, i, f, t); this.nextRight = nextRight;
5614		this.transformer = transformer;
5615		this.basis = basis; this.reducer = reducer;
5616		}
5617	<	@SuppressWarnings("unchecked") public final boolean exec() {
5618	<	final ObjectByObjectToDouble<? super K, ? super V> transformer =
5619	<	this.transformer;
5620	<	final DoubleByDoubleToDouble reducer = this.reducer;
5621	<	if (transformer == null || reducer == null)
5622	<	return abortOnNullFunction();
5623	<	try {
5624	<	final double id = this.basis;
5625	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5626	<	do {} while (!casPending(c = pending, c+1));
5617	>	public final Double getRawResult() { return result; }
5618	>	public final void compute() {
5619	>	final ToDoubleBiFunction<? super K, ? super V> transformer;
5620	>	final DoubleBinaryOperator reducer;
5621	>	if ((transformer = this.transformer) != null &&
5622	>	(reducer = this.reducer) != null) {
5623	>	double r = this.basis;
5624	>	for (int i = baseIndex, f, h; batch > 0 &&
5625	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5626	>	addToPendingCount(1);
5627		(rights = new MapReduceMappingsToDoubleTask<K,V>
5628	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5628	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5629	>	rights, transformer, r, reducer)).fork();
5630		}
5631	<	double r = id;
5632	<	Object v;
6625	<	while ((v = advance()) != null)
6626	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5631	>	for (Node<K,V> p; (p = advance()) != null; )
5632	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.key, p.val));
5633		result = r;
5634	<	for (MapReduceMappingsToDoubleTask<K,V> t = this, s;;) {
5635	<	int c; BulkTask<K,V,?> par;
5636	<	if ((c = t.pending) == 0) {
5637	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5638	<	t.result = reducer.apply(t.result, s.result);
5639	<	}
5640	<	if ((par = t.parent) == null ||
5641	<	!(par instanceof MapReduceMappingsToDoubleTask)) {
6636	<	t.quietlyComplete();
6637	<	break;
6638	<	}
6639	<	t = (MapReduceMappingsToDoubleTask<K,V>)par;
5634	>	CountedCompleter<?> c;
5635	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5636	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5637	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5638	>	s = t.rights;
5639	>	while (s != null) {
5640	>	t.result = reducer.applyAsDouble(t.result, s.result);
5641	>	s = t.rights = s.nextRight;
5642		}
6641	–	else if (t.casPending(c, c - 1))
6642	–	break;
5643		}
6644	–	} catch (Throwable ex) {
6645	–	return tryCompleteComputation(ex);
5644		}
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;
5645		}
6656	–	public final Double getRawResult() { return result; }
5646		}
5647
5648	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5648	>	@SuppressWarnings("serial")
5649	>	static final class MapReduceKeysToLongTask<K,V>
5650		extends BulkTask<K,V,Long> {
5651	<	final ObjectToLong<? super K> transformer;
5652	<	final LongByLongToLong reducer;
5651	>	final ToLongFunction<? super K> transformer;
5652	>	final LongBinaryOperator reducer;
5653		final long basis;
5654		long result;
5655		MapReduceKeysToLongTask<K,V> rights, nextRight;
5656		MapReduceKeysToLongTask
5657	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5657	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5658		MapReduceKeysToLongTask<K,V> nextRight,
5659	<	ObjectToLong<? super K> transformer,
5659	>	ToLongFunction<? super K> transformer,
5660		long basis,
5661	<	LongByLongToLong reducer) {
5662	<	super(m, p, b); this.nextRight = nextRight;
5661	>	LongBinaryOperator reducer) {
5662	>	super(p, b, i, f, t); this.nextRight = nextRight;
5663		this.transformer = transformer;
5664		this.basis = basis; this.reducer = reducer;
5665		}
5666	<	@SuppressWarnings("unchecked") public final boolean exec() {
5667	<	final ObjectToLong<? super K> transformer =
5668	<	this.transformer;
5669	<	final LongByLongToLong reducer = this.reducer;
5670	<	if (transformer == null || reducer == null)
5671	<	return abortOnNullFunction();
5672	<	try {
5673	<	final long id = this.basis;
5674	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5675	<	do {} while (!casPending(c = pending, c+1));
5666	>	public final Long getRawResult() { return result; }
5667	>	public final void compute() {
5668	>	final ToLongFunction<? super K> transformer;
5669	>	final LongBinaryOperator reducer;
5670	>	if ((transformer = this.transformer) != null &&
5671	>	(reducer = this.reducer) != null) {
5672	>	long r = this.basis;
5673	>	for (int i = baseIndex, f, h; batch > 0 &&
5674	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5675	>	addToPendingCount(1);
5676		(rights = new MapReduceKeysToLongTask<K,V>
5677	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5677	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5678	>	rights, transformer, r, reducer)).fork();
5679		}
5680	<	long r = id;
5681	<	while (advance() != null)
6691	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5680	>	for (Node<K,V> p; (p = advance()) != null; )
5681	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.key));
5682		result = r;
5683	<	for (MapReduceKeysToLongTask<K,V> t = this, s;;) {
5684	<	int c; BulkTask<K,V,?> par;
5685	<	if ((c = t.pending) == 0) {
5686	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5687	<	t.result = reducer.apply(t.result, s.result);
5688	<	}
5689	<	if ((par = t.parent) == null ||
5690	<	!(par instanceof MapReduceKeysToLongTask)) {
6701	<	t.quietlyComplete();
6702	<	break;
6703	<	}
6704	<	t = (MapReduceKeysToLongTask<K,V>)par;
5683	>	CountedCompleter<?> c;
5684	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5685	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5686	>	t = (MapReduceKeysToLongTask<K,V>)c,
5687	>	s = t.rights;
5688	>	while (s != null) {
5689	>	t.result = reducer.applyAsLong(t.result, s.result);
5690	>	s = t.rights = s.nextRight;
5691		}
6706	–	else if (t.casPending(c, c - 1))
6707	–	break;
5692		}
6709	–	} catch (Throwable ex) {
6710	–	return tryCompleteComputation(ex);
5693		}
6712	–	MapReduceKeysToLongTask<K,V> s = rights;
6713	–	if (s != null && !inForkJoinPool()) {
6714	–	do  {
6715	–	if (s.tryUnfork())
6716	–	s.exec();
6717	–	} while ((s = s.nextRight) != null);
6718	–	}
6719	–	return false;
5694		}
6721	–	public final Long getRawResult() { return result; }
5695		}
5696
5697	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5697	>	@SuppressWarnings("serial")
5698	>	static final class MapReduceValuesToLongTask<K,V>
5699		extends BulkTask<K,V,Long> {
5700	<	final ObjectToLong<? super V> transformer;
5701	<	final LongByLongToLong reducer;
5700	>	final ToLongFunction<? super V> transformer;
5701	>	final LongBinaryOperator reducer;
5702		final long basis;
5703		long result;
5704		MapReduceValuesToLongTask<K,V> rights, nextRight;
5705		MapReduceValuesToLongTask
5706	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5706	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5707		MapReduceValuesToLongTask<K,V> nextRight,
5708	<	ObjectToLong<? super V> transformer,
5708	>	ToLongFunction<? super V> transformer,
5709		long basis,
5710	<	LongByLongToLong reducer) {
5711	<	super(m, p, b); this.nextRight = nextRight;
5710	>	LongBinaryOperator reducer) {
5711	>	super(p, b, i, f, t); this.nextRight = nextRight;
5712		this.transformer = transformer;
5713		this.basis = basis; this.reducer = reducer;
5714		}
5715	<	@SuppressWarnings("unchecked") public final boolean exec() {
5716	<	final ObjectToLong<? super V> transformer =
5717	<	this.transformer;
5718	<	final LongByLongToLong reducer = this.reducer;
5719	<	if (transformer == null || reducer == null)
5720	<	return abortOnNullFunction();
5721	<	try {
5722	<	final long id = this.basis;
5723	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5724	<	do {} while (!casPending(c = pending, c+1));
5715	>	public final Long getRawResult() { return result; }
5716	>	public final void compute() {
5717	>	final ToLongFunction<? super V> transformer;
5718	>	final LongBinaryOperator reducer;
5719	>	if ((transformer = this.transformer) != null &&
5720	>	(reducer = this.reducer) != null) {
5721	>	long r = this.basis;
5722	>	for (int i = baseIndex, f, h; batch > 0 &&
5723	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5724	>	addToPendingCount(1);
5725		(rights = new MapReduceValuesToLongTask<K,V>
5726	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5726	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5727	>	rights, transformer, r, reducer)).fork();
5728		}
5729	<	long r = id;
5730	<	Object v;
6756	<	while ((v = advance()) != null)
6757	<	r = reducer.apply(r, transformer.apply((V)v));
5729	>	for (Node<K,V> p; (p = advance()) != null; )
5730	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.val));
5731		result = r;
5732	<	for (MapReduceValuesToLongTask<K,V> t = this, s;;) {
5733	<	int c; BulkTask<K,V,?> par;
5734	<	if ((c = t.pending) == 0) {
5735	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5736	<	t.result = reducer.apply(t.result, s.result);
5737	<	}
5738	<	if ((par = t.parent) == null ||
5739	<	!(par instanceof MapReduceValuesToLongTask)) {
6767	<	t.quietlyComplete();
6768	<	break;
6769	<	}
6770	<	t = (MapReduceValuesToLongTask<K,V>)par;
5732	>	CountedCompleter<?> c;
5733	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5734	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5735	>	t = (MapReduceValuesToLongTask<K,V>)c,
5736	>	s = t.rights;
5737	>	while (s != null) {
5738	>	t.result = reducer.applyAsLong(t.result, s.result);
5739	>	s = t.rights = s.nextRight;
5740		}
6772	–	else if (t.casPending(c, c - 1))
6773	–	break;
5741		}
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);
5742		}
6785	–	return false;
5743		}
6787	–	public final Long getRawResult() { return result; }
5744		}
5745
5746	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5746	>	@SuppressWarnings("serial")
5747	>	static final class MapReduceEntriesToLongTask<K,V>
5748		extends BulkTask<K,V,Long> {
5749	<	final ObjectToLong<Map.Entry<K,V>> transformer;
5750	<	final LongByLongToLong reducer;
5749	>	final ToLongFunction<Map.Entry<K,V>> transformer;
5750	>	final LongBinaryOperator reducer;
5751		final long basis;
5752		long result;
5753		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5754		MapReduceEntriesToLongTask
5755	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5755	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5756		MapReduceEntriesToLongTask<K,V> nextRight,
5757	<	ObjectToLong<Map.Entry<K,V>> transformer,
5757	>	ToLongFunction<Map.Entry<K,V>> transformer,
5758		long basis,
5759	<	LongByLongToLong reducer) {
5760	<	super(m, p, b); this.nextRight = nextRight;
5759	>	LongBinaryOperator reducer) {
5760	>	super(p, b, i, f, t); this.nextRight = nextRight;
5761		this.transformer = transformer;
5762		this.basis = basis; this.reducer = reducer;
5763		}
5764	<	@SuppressWarnings("unchecked") public final boolean exec() {
5765	<	final ObjectToLong<Map.Entry<K,V>> transformer =
5766	<	this.transformer;
5767	<	final LongByLongToLong reducer = this.reducer;
5768	<	if (transformer == null || reducer == null)
5769	<	return abortOnNullFunction();
5770	<	try {
5771	<	final long id = this.basis;
5772	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5773	<	do {} while (!casPending(c = pending, c+1));
5764	>	public final Long getRawResult() { return result; }
5765	>	public final void compute() {
5766	>	final ToLongFunction<Map.Entry<K,V>> transformer;
5767	>	final LongBinaryOperator reducer;
5768	>	if ((transformer = this.transformer) != null &&
5769	>	(reducer = this.reducer) != null) {
5770	>	long r = this.basis;
5771	>	for (int i = baseIndex, f, h; batch > 0 &&
5772	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5773	>	addToPendingCount(1);
5774		(rights = new MapReduceEntriesToLongTask<K,V>
5775	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5775	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5776	>	rights, transformer, r, reducer)).fork();
5777		}
5778	<	long r = id;
5779	<	Object v;
6822	<	while ((v = advance()) != null)
6823	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5778	>	for (Node<K,V> p; (p = advance()) != null; )
5779	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p));
5780		result = r;
5781	<	for (MapReduceEntriesToLongTask<K,V> t = this, s;;) {
5782	<	int c; BulkTask<K,V,?> par;
5783	<	if ((c = t.pending) == 0) {
5784	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5785	<	t.result = reducer.apply(t.result, s.result);
5786	<	}
5787	<	if ((par = t.parent) == null ||
5788	<	!(par instanceof MapReduceEntriesToLongTask)) {
6833	<	t.quietlyComplete();
6834	<	break;
6835	<	}
6836	<	t = (MapReduceEntriesToLongTask<K,V>)par;
5781	>	CountedCompleter<?> c;
5782	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5783	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5784	>	t = (MapReduceEntriesToLongTask<K,V>)c,
5785	>	s = t.rights;
5786	>	while (s != null) {
5787	>	t.result = reducer.applyAsLong(t.result, s.result);
5788	>	s = t.rights = s.nextRight;
5789		}
6838	–	else if (t.casPending(c, c - 1))
6839	–	break;
5790		}
6841	–	} catch (Throwable ex) {
6842	–	return tryCompleteComputation(ex);
6843	–	}
6844	–	MapReduceEntriesToLongTask<K,V> s = rights;
6845	–	if (s != null && !inForkJoinPool()) {
6846	–	do  {
6847	–	if (s.tryUnfork())
6848	–	s.exec();
6849	–	} while ((s = s.nextRight) != null);
5791		}
6851	–	return false;
5792		}
6853	–	public final Long getRawResult() { return result; }
5793		}
5794
5795	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5795	>	@SuppressWarnings("serial")
5796	>	static final class MapReduceMappingsToLongTask<K,V>
5797		extends BulkTask<K,V,Long> {
5798	<	final ObjectByObjectToLong<? super K, ? super V> transformer;
5799	<	final LongByLongToLong reducer;
5798	>	final ToLongBiFunction<? super K, ? super V> transformer;
5799	>	final LongBinaryOperator reducer;
5800		final long basis;
5801		long result;
5802		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5803		MapReduceMappingsToLongTask
5804	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5804	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5805		MapReduceMappingsToLongTask<K,V> nextRight,
5806	<	ObjectByObjectToLong<? super K, ? super V> transformer,
5806	>	ToLongBiFunction<? super K, ? super V> transformer,
5807		long basis,
5808	<	LongByLongToLong reducer) {
5809	<	super(m, p, b); this.nextRight = nextRight;
5808	>	LongBinaryOperator reducer) {
5809	>	super(p, b, i, f, t); this.nextRight = nextRight;
5810		this.transformer = transformer;
5811		this.basis = basis; this.reducer = reducer;
5812		}
5813	<	@SuppressWarnings("unchecked") public final boolean exec() {
5814	<	final ObjectByObjectToLong<? super K, ? super V> transformer =
5815	<	this.transformer;
5816	<	final LongByLongToLong reducer = this.reducer;
5817	<	if (transformer == null || reducer == null)
5818	<	return abortOnNullFunction();
5819	<	try {
5820	<	final long id = this.basis;
5821	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5822	<	do {} while (!casPending(c = pending, c+1));
5813	>	public final Long getRawResult() { return result; }
5814	>	public final void compute() {
5815	>	final ToLongBiFunction<? super K, ? super V> transformer;
5816	>	final LongBinaryOperator reducer;
5817	>	if ((transformer = this.transformer) != null &&
5818	>	(reducer = this.reducer) != null) {
5819	>	long r = this.basis;
5820	>	for (int i = baseIndex, f, h; batch > 0 &&
5821	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5822	>	addToPendingCount(1);
5823		(rights = new MapReduceMappingsToLongTask<K,V>
5824	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5824	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5825	>	rights, transformer, r, reducer)).fork();
5826		}
5827	<	long r = id;
5828	<	Object v;
6888	<	while ((v = advance()) != null)
6889	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5827	>	for (Node<K,V> p; (p = advance()) != null; )
5828	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.key, p.val));
5829		result = r;
5830	<	for (MapReduceMappingsToLongTask<K,V> t = this, s;;) {
5831	<	int c; BulkTask<K,V,?> par;
5832	<	if ((c = t.pending) == 0) {
5833	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5834	<	t.result = reducer.apply(t.result, s.result);
5835	<	}
5836	<	if ((par = t.parent) == null ||
5837	<	!(par instanceof MapReduceMappingsToLongTask)) {
6899	<	t.quietlyComplete();
6900	<	break;
6901	<	}
6902	<	t = (MapReduceMappingsToLongTask<K,V>)par;
5830	>	CountedCompleter<?> c;
5831	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5832	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5833	>	t = (MapReduceMappingsToLongTask<K,V>)c,
5834	>	s = t.rights;
5835	>	while (s != null) {
5836	>	t.result = reducer.applyAsLong(t.result, s.result);
5837	>	s = t.rights = s.nextRight;
5838		}
6904	–	else if (t.casPending(c, c - 1))
6905	–	break;
5839		}
6907	–	} catch (Throwable ex) {
6908	–	return tryCompleteComputation(ex);
6909	–	}
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);
5840		}
6917	–	return false;
5841		}
6919	–	public final Long getRawResult() { return result; }
5842		}
5843
5844	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5844	>	@SuppressWarnings("serial")
5845	>	static final class MapReduceKeysToIntTask<K,V>
5846		extends BulkTask<K,V,Integer> {
5847	<	final ObjectToInt<? super K> transformer;
5848	<	final IntByIntToInt reducer;
5847	>	final ToIntFunction<? super K> transformer;
5848	>	final IntBinaryOperator reducer;
5849		final int basis;
5850		int result;
5851		MapReduceKeysToIntTask<K,V> rights, nextRight;
5852		MapReduceKeysToIntTask
5853	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5853	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5854		MapReduceKeysToIntTask<K,V> nextRight,
5855	<	ObjectToInt<? super K> transformer,
5855	>	ToIntFunction<? super K> transformer,
5856		int basis,
5857	<	IntByIntToInt reducer) {
5858	<	super(m, p, b); this.nextRight = nextRight;
5857	>	IntBinaryOperator reducer) {
5858	>	super(p, b, i, f, t); this.nextRight = nextRight;
5859		this.transformer = transformer;
5860		this.basis = basis; this.reducer = reducer;
5861		}
5862	<	@SuppressWarnings("unchecked") public final boolean exec() {
5863	<	final ObjectToInt<? super K> transformer =
5864	<	this.transformer;
5865	<	final IntByIntToInt reducer = this.reducer;
5866	<	if (transformer == null || reducer == null)
5867	<	return abortOnNullFunction();
5868	<	try {
5869	<	final int id = this.basis;
5870	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5871	<	do {} while (!casPending(c = pending, c+1));
5862	>	public final Integer getRawResult() { return result; }
5863	>	public final void compute() {
5864	>	final ToIntFunction<? super K> transformer;
5865	>	final IntBinaryOperator reducer;
5866	>	if ((transformer = this.transformer) != null &&
5867	>	(reducer = this.reducer) != null) {
5868	>	int r = this.basis;
5869	>	for (int i = baseIndex, f, h; batch > 0 &&
5870	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5871	>	addToPendingCount(1);
5872		(rights = new MapReduceKeysToIntTask<K,V>
5873	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5873	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5874	>	rights, transformer, r, reducer)).fork();
5875		}
5876	<	int r = id;
5877	<	while (advance() != null)
6954	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5876	>	for (Node<K,V> p; (p = advance()) != null; )
5877	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.key));
5878		result = r;
5879	<	for (MapReduceKeysToIntTask<K,V> t = this, s;;) {
5880	<	int c; BulkTask<K,V,?> par;
5881	<	if ((c = t.pending) == 0) {
5882	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5883	<	t.result = reducer.apply(t.result, s.result);
5884	<	}
5885	<	if ((par = t.parent) == null ||
5886	<	!(par instanceof MapReduceKeysToIntTask)) {
6964	<	t.quietlyComplete();
6965	<	break;
6966	<	}
6967	<	t = (MapReduceKeysToIntTask<K,V>)par;
5879	>	CountedCompleter<?> c;
5880	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5881	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5882	>	t = (MapReduceKeysToIntTask<K,V>)c,
5883	>	s = t.rights;
5884	>	while (s != null) {
5885	>	t.result = reducer.applyAsInt(t.result, s.result);
5886	>	s = t.rights = s.nextRight;
5887		}
6969	–	else if (t.casPending(c, c - 1))
6970	–	break;
5888		}
6972	–	} catch (Throwable ex) {
6973	–	return tryCompleteComputation(ex);
5889		}
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);
6981	–	}
6982	–	return false;
5890		}
6984	–	public final Integer getRawResult() { return result; }
5891		}
5892
5893	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5893	>	@SuppressWarnings("serial")
5894	>	static final class MapReduceValuesToIntTask<K,V>
5895		extends BulkTask<K,V,Integer> {
5896	<	final ObjectToInt<? super V> transformer;
5897	<	final IntByIntToInt reducer;
5896	>	final ToIntFunction<? super V> transformer;
5897	>	final IntBinaryOperator reducer;
5898		final int basis;
5899		int result;
5900		MapReduceValuesToIntTask<K,V> rights, nextRight;
5901		MapReduceValuesToIntTask
5902	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5902	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5903		MapReduceValuesToIntTask<K,V> nextRight,
5904	<	ObjectToInt<? super V> transformer,
5904	>	ToIntFunction<? super V> transformer,
5905		int basis,
5906	<	IntByIntToInt reducer) {
5907	<	super(m, p, b); this.nextRight = nextRight;
5906	>	IntBinaryOperator reducer) {
5907	>	super(p, b, i, f, t); this.nextRight = nextRight;
5908		this.transformer = transformer;
5909		this.basis = basis; this.reducer = reducer;
5910		}
5911	<	@SuppressWarnings("unchecked") public final boolean exec() {
5912	<	final ObjectToInt<? super V> transformer =
5913	<	this.transformer;
5914	<	final IntByIntToInt reducer = this.reducer;
5915	<	if (transformer == null || reducer == null)
5916	<	return abortOnNullFunction();
5917	<	try {
5918	<	final int id = this.basis;
5919	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5920	<	do {} while (!casPending(c = pending, c+1));
5911	>	public final Integer getRawResult() { return result; }
5912	>	public final void compute() {
5913	>	final ToIntFunction<? super V> transformer;
5914	>	final IntBinaryOperator reducer;
5915	>	if ((transformer = this.transformer) != null &&
5916	>	(reducer = this.reducer) != null) {
5917	>	int r = this.basis;
5918	>	for (int i = baseIndex, f, h; batch > 0 &&
5919	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5920	>	addToPendingCount(1);
5921		(rights = new MapReduceValuesToIntTask<K,V>
5922	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5922	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5923	>	rights, transformer, r, reducer)).fork();
5924		}
5925	<	int r = id;
5926	<	Object v;
7019	<	while ((v = advance()) != null)
7020	<	r = reducer.apply(r, transformer.apply((V)v));
5925	>	for (Node<K,V> p; (p = advance()) != null; )
5926	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.val));
5927		result = r;
5928	<	for (MapReduceValuesToIntTask<K,V> t = this, s;;) {
5929	<	int c; BulkTask<K,V,?> par;
5930	<	if ((c = t.pending) == 0) {
5931	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5932	<	t.result = reducer.apply(t.result, s.result);
5933	<	}
5934	<	if ((par = t.parent) == null ||
5935	<	!(par instanceof MapReduceValuesToIntTask)) {
7030	<	t.quietlyComplete();
7031	<	break;
7032	<	}
7033	<	t = (MapReduceValuesToIntTask<K,V>)par;
5928	>	CountedCompleter<?> c;
5929	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5930	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5931	>	t = (MapReduceValuesToIntTask<K,V>)c,
5932	>	s = t.rights;
5933	>	while (s != null) {
5934	>	t.result = reducer.applyAsInt(t.result, s.result);
5935	>	s = t.rights = s.nextRight;
5936		}
7035	–	else if (t.casPending(c, c - 1))
7036	–	break;
5937		}
7038	–	} catch (Throwable ex) {
7039	–	return tryCompleteComputation(ex);
5938		}
7041	–	MapReduceValuesToIntTask<K,V> s = rights;
7042	–	if (s != null && !inForkJoinPool()) {
7043	–	do  {
7044	–	if (s.tryUnfork())
7045	–	s.exec();
7046	–	} while ((s = s.nextRight) != null);
7047	–	}
7048	–	return false;
5939		}
7050	–	public final Integer getRawResult() { return result; }
5940		}
5941
5942	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
5942	>	@SuppressWarnings("serial")
5943	>	static final class MapReduceEntriesToIntTask<K,V>
5944		extends BulkTask<K,V,Integer> {
5945	<	final ObjectToInt<Map.Entry<K,V>> transformer;
5946	<	final IntByIntToInt reducer;
5945	>	final ToIntFunction<Map.Entry<K,V>> transformer;
5946	>	final IntBinaryOperator reducer;
5947		final int basis;
5948		int result;
5949		MapReduceEntriesToIntTask<K,V> rights, nextRight;
5950		MapReduceEntriesToIntTask
5951	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
5951	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5952		MapReduceEntriesToIntTask<K,V> nextRight,
5953	<	ObjectToInt<Map.Entry<K,V>> transformer,
5953	>	ToIntFunction<Map.Entry<K,V>> transformer,
5954		int basis,
5955	<	IntByIntToInt reducer) {
5956	<	super(m, p, b); this.nextRight = nextRight;
5955	>	IntBinaryOperator reducer) {
5956	>	super(p, b, i, f, t); this.nextRight = nextRight;
5957		this.transformer = transformer;
5958		this.basis = basis; this.reducer = reducer;
5959		}
5960	<	@SuppressWarnings("unchecked") public final boolean exec() {
5961	<	final ObjectToInt<Map.Entry<K,V>> transformer =
5962	<	this.transformer;
5963	<	final IntByIntToInt reducer = this.reducer;
5964	<	if (transformer == null || reducer == null)
5965	<	return abortOnNullFunction();
5966	<	try {
5967	<	final int id = this.basis;
5968	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5969	<	do {} while (!casPending(c = pending, c+1));
5960	>	public final Integer getRawResult() { return result; }
5961	>	public final void compute() {
5962	>	final ToIntFunction<Map.Entry<K,V>> transformer;
5963	>	final IntBinaryOperator reducer;
5964	>	if ((transformer = this.transformer) != null &&
5965	>	(reducer = this.reducer) != null) {
5966	>	int r = this.basis;
5967	>	for (int i = baseIndex, f, h; batch > 0 &&
5968	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5969	>	addToPendingCount(1);
5970		(rights = new MapReduceEntriesToIntTask<K,V>
5971	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5971	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5972	>	rights, transformer, r, reducer)).fork();
5973		}
5974	<	int r = id;
5975	<	Object v;
7085	<	while ((v = advance()) != null)
7086	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5974	>	for (Node<K,V> p; (p = advance()) != null; )
5975	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p));
5976		result = r;
5977	<	for (MapReduceEntriesToIntTask<K,V> t = this, s;;) {
5978	<	int c; BulkTask<K,V,?> par;
5979	<	if ((c = t.pending) == 0) {
5980	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5981	<	t.result = reducer.apply(t.result, s.result);
5982	<	}
5983	<	if ((par = t.parent) == null ||
5984	<	!(par instanceof MapReduceEntriesToIntTask)) {
7096	<	t.quietlyComplete();
7097	<	break;
7098	<	}
7099	<	t = (MapReduceEntriesToIntTask<K,V>)par;
5977	>	CountedCompleter<?> c;
5978	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5979	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
5980	>	t = (MapReduceEntriesToIntTask<K,V>)c,
5981	>	s = t.rights;
5982	>	while (s != null) {
5983	>	t.result = reducer.applyAsInt(t.result, s.result);
5984	>	s = t.rights = s.nextRight;
5985		}
7101	–	else if (t.casPending(c, c - 1))
7102	–	break;
5986		}
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);
5987		}
7114	–	return false;
5988		}
7116	–	public final Integer getRawResult() { return result; }
5989		}
5990
5991	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
5991	>	@SuppressWarnings("serial")
5992	>	static final class MapReduceMappingsToIntTask<K,V>
5993		extends BulkTask<K,V,Integer> {
5994	<	final ObjectByObjectToInt<? super K, ? super V> transformer;
5995	<	final IntByIntToInt reducer;
5994	>	final ToIntBiFunction<? super K, ? super V> transformer;
5995	>	final IntBinaryOperator reducer;
5996		final int basis;
5997		int result;
5998		MapReduceMappingsToIntTask<K,V> rights, nextRight;
5999		MapReduceMappingsToIntTask
6000	<	(ConcurrentHashMap<K,V> m, BulkTask<K,V,?> p, int b,
6001	<	MapReduceMappingsToIntTask<K,V> rights,
6002	<	ObjectByObjectToInt<? super K, ? super V> transformer,
6000	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6001	>	MapReduceMappingsToIntTask<K,V> nextRight,
6002	>	ToIntBiFunction<? super K, ? super V> transformer,
6003		int basis,
6004	<	IntByIntToInt reducer) {
6005	<	super(m, p, b); this.nextRight = nextRight;
6004	>	IntBinaryOperator reducer) {
6005	>	super(p, b, i, f, t); this.nextRight = nextRight;
6006		this.transformer = transformer;
6007		this.basis = basis; this.reducer = reducer;
6008		}
6009	<	@SuppressWarnings("unchecked") public final boolean exec() {
6010	<	final ObjectByObjectToInt<? super K, ? super V> transformer =
6011	<	this.transformer;
6012	<	final IntByIntToInt reducer = this.reducer;
6013	<	if (transformer == null || reducer == null)
6014	<	return abortOnNullFunction();
6015	<	try {
6016	<	final int id = this.basis;
6017	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6018	<	do {} while (!casPending(c = pending, c+1));
6009	>	public final Integer getRawResult() { return result; }
6010	>	public final void compute() {
6011	>	final ToIntBiFunction<? super K, ? super V> transformer;
6012	>	final IntBinaryOperator reducer;
6013	>	if ((transformer = this.transformer) != null &&
6014	>	(reducer = this.reducer) != null) {
6015	>	int r = this.basis;
6016	>	for (int i = baseIndex, f, h; batch > 0 &&
6017	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6018	>	addToPendingCount(1);
6019		(rights = new MapReduceMappingsToIntTask<K,V>
6020	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6020	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6021	>	rights, transformer, r, reducer)).fork();
6022		}
6023	<	int r = id;
6024	<	Object v;
7151	<	while ((v = advance()) != null)
7152	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
6023	>	for (Node<K,V> p; (p = advance()) != null; )
6024	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.key, p.val));
6025		result = r;
6026	<	for (MapReduceMappingsToIntTask<K,V> t = this, s;;) {
6027	<	int c; BulkTask<K,V,?> par;
6028	<	if ((c = t.pending) == 0) {
6029	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6030	<	t.result = reducer.apply(t.result, s.result);
6031	<	}
6032	<	if ((par = t.parent) == null ||
6033	<	!(par instanceof MapReduceMappingsToIntTask)) {
7162	<	t.quietlyComplete();
7163	<	break;
7164	<	}
7165	<	t = (MapReduceMappingsToIntTask<K,V>)par;
6026	>	CountedCompleter<?> c;
6027	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6028	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
6029	>	t = (MapReduceMappingsToIntTask<K,V>)c,
6030	>	s = t.rights;
6031	>	while (s != null) {
6032	>	t.result = reducer.applyAsInt(t.result, s.result);
6033	>	s = t.rights = s.nextRight;
6034		}
7167	–	else if (t.casPending(c, c - 1))
7168	–	break;
6035		}
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);
6036		}
7180	–	return false;
6037		}
7182	–	public final Integer getRawResult() { return result; }
6038		}
6039
6040		// Unsafe mechanics
6041	<	private static final sun.misc.Unsafe UNSAFE;
6042	<	private static final long counterOffset;
6043	<	private static final long sizeCtlOffset;
6041	>	private static final sun.misc.Unsafe U;
6042	>	private static final long SIZECTL;
6043	>	private static final long TRANSFERINDEX;
6044	>	private static final long TRANSFERORIGIN;
6045	>	private static final long BASECOUNT;
6046	>	private static final long CELLSBUSY;
6047	>	private static final long CELLVALUE;
6048		private static final long ABASE;
6049		private static final int ASHIFT;
6050
6051		static {
7193	–	int ss;
6052		try {
6053	<	UNSAFE = sun.misc.Unsafe.getUnsafe();
6053	>	U = sun.misc.Unsafe.getUnsafe();
6054		Class<?> k = ConcurrentHashMap.class;
6055	<	counterOffset = UNSAFE.objectFieldOffset
7198	<	(k.getDeclaredField("counter"));
7199	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6055	>	SIZECTL = U.objectFieldOffset
6056		(k.getDeclaredField("sizeCtl"));
6057	+	TRANSFERINDEX = U.objectFieldOffset
6058	+	(k.getDeclaredField("transferIndex"));
6059	+	TRANSFERORIGIN = U.objectFieldOffset
6060	+	(k.getDeclaredField("transferOrigin"));
6061	+	BASECOUNT = U.objectFieldOffset
6062	+	(k.getDeclaredField("baseCount"));
6063	+	CELLSBUSY = U.objectFieldOffset
6064	+	(k.getDeclaredField("cellsBusy"));
6065	+	Class<?> ck = CounterCell.class;
6066	+	CELLVALUE = U.objectFieldOffset
6067	+	(ck.getDeclaredField("value"));
6068		Class<?> sc = Node[].class;
6069	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6070	<	ss = UNSAFE.arrayIndexScale(sc);
6069	>	ABASE = U.arrayBaseOffset(sc);
6070	>	int scale = U.arrayIndexScale(sc);
6071	>	if ((scale & (scale - 1)) != 0)
6072	>	throw new Error("data type scale not a power of two");
6073	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6074		} catch (Exception e) {
6075		throw new Error(e);
6076		}
7207	–	if ((ss & (ss-1)) != 0)
7208	–	throw new Error("data type scale not a power of two");
7209	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6077		}
6078		}

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