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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.82 by dl, Thu Dec 13 20:34:00 2012 UTC vs.
Revision 1.118 by dl, Sun Dec 1 16:08:12 2013 UTC

#	Line 6 | Line 6
6
7		package jsr166e;
8
9	<	import java.util.Comparator;
9	>	import jsr166e.ForkJoinPool;
10	>
11	>	import java.io.ObjectStreamField;
12	>	import java.io.Serializable;
13	>	import java.lang.reflect.ParameterizedType;
14	>	import java.lang.reflect.Type;
15	>	import java.util.AbstractMap;
16		import java.util.Arrays;
11	–	import java.util.Map;
12	–	import java.util.Set;
17		import java.util.Collection;
18	<	import java.util.AbstractMap;
19	<	import java.util.AbstractSet;
20	<	import java.util.AbstractCollection;
17	<	import java.util.Hashtable;
18	>	import java.util.Comparator;
19	>	import java.util.ConcurrentModificationException;
20	>	import java.util.Enumeration;
21		import java.util.HashMap;
22	+	import java.util.Hashtable;
23		import java.util.Iterator;
24	<	import java.util.Enumeration;
21	<	import java.util.ConcurrentModificationException;
24	>	import java.util.Map;
25		import java.util.NoSuchElementException;
26	+	import java.util.Set;
27		import java.util.concurrent.ConcurrentMap;
24	–	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
25	–	import java.util.concurrent.atomic.AtomicInteger;
28		import java.util.concurrent.atomic.AtomicReference;
29	<	import java.io.Serializable;
29	>	import java.util.concurrent.atomic.AtomicInteger;
30	>	import java.util.concurrent.locks.LockSupport;
31	>	import java.util.concurrent.locks.ReentrantLock;
32
33		/**
34		* A hash table supporting full concurrency of retrievals and
#	Line 78 | Line 82 | import java.io.Serializable;
82		* expected {@code concurrencyLevel} as an additional hint for
83		* internal sizing.  Note that using many keys with exactly the same
84		* {@code hashCode()} is a sure way to slow down performance of any
85	<	* hash table.
85	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
86	>	* this class may use comparison order among keys to help break ties.
87		*
88		* <p>A {@link Set} projection of a ConcurrentHashMapV8 may be created
89		* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
#	Line 86 | Line 91 | import java.io.Serializable;
91		* mapped values are (perhaps transiently) not used or all take the
92		* same mapping value.
93		*
89	–	* <p>A ConcurrentHashMapV8 can be used as scalable frequency map (a
90	–	* form of histogram or multiset) by using {@link LongAdder} values
91	–	* and initializing via {@link #computeIfAbsent}. For example, to add
92	–	* a count to a {@code ConcurrentHashMapV8<String,LongAdder> freqs}, you
93	–	* can use {@code freqs.computeIfAbsent(k -> new
94	–	* LongAdder()).increment();}
95	–	*
94		* <p>This class and its views and iterators implement all of the
95		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
96		* interfaces.
#	Line 100 | Line 98 | import java.io.Serializable;
98		* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
99		* does <em>not</em> allow {@code null} to be used as a key or value.
100		*
101	<	* <p>ConcurrentHashMapV8s support parallel operations using the {@link
102	<	* ForkJoinPool#commonPool}. (Tasks that may be used in other contexts
103	<	* are available in class {@link ForkJoinTasks}). These operations are
104	<	* designed to be safely, and often sensibly, applied even with maps
105	<	* that are being concurrently updated by other threads; for example,
106	<	* when computing a snapshot summary of the values in a shared
107	<	* registry.  There are three kinds of operation, each with four
108	<	* forms, accepting functions with Keys, Values, Entries, and (Key,
109	<	* Value) arguments and/or return values. (The first three forms are
110	<	* also available via the {@link #keySet()}, {@link #values()} and
111	<	* {@link #entrySet()} views). Because the elements of a
112	<	* ConcurrentHashMapV8 are not ordered in any particular way, and may be
113	<	* processed in different orders in different parallel executions, the
114	<	* correctness of supplied functions should not depend on any
115	<	* ordering, or on any other objects or values that may transiently
118	<	* change while computation is in progress; and except for forEach
119	<	* actions, should ideally be side-effect-free.
101	>	* <p>ConcurrentHashMapV8s support a set of sequential and parallel bulk
102	>	* operations that are designed
103	>	* to be safely, and often sensibly, applied even with maps that are
104	>	* being concurrently updated by other threads; for example, when
105	>	* computing a snapshot summary of the values in a shared registry.
106	>	* There are three kinds of operation, each with four forms, accepting
107	>	* functions with Keys, Values, Entries, and (Key, Value) arguments
108	>	* and/or return values. Because the elements of a ConcurrentHashMapV8
109	>	* are not ordered in any particular way, and may be processed in
110	>	* different orders in different parallel executions, the correctness
111	>	* of supplied functions should not depend on any ordering, or on any
112	>	* other objects or values that may transiently change while
113	>	* computation is in progress; and except for forEach actions, should
114	>	* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry}
115	>	* objects do not support method {@code setValue}.
116		*
117		* <ul>
118		* <li> forEach: Perform a given action on each element.
#	Line 143 | Line 139 | import java.io.Serializable;
139		* <li> Reductions to scalar doubles, longs, and ints, using a
140		* given basis value.</li>
141		*
146	–	* </li>
142		* </ul>
143	+	* </li>
144		* </ul>
145		*
146	+	* <p>These bulk operations accept a {@code parallelismThreshold}
147	+	* argument. Methods proceed sequentially if the current map size is
148	+	* estimated to be less than the given threshold. Using a value of
149	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
150	+	* of {@code 1} results in maximal parallelism by partitioning into
151	+	* enough subtasks to fully utilize the {@link
152	+	* ForkJoinPool#commonPool()} that is used for all parallel
153	+	* computations. Normally, you would initially choose one of these
154	+	* extreme values, and then measure performance of using in-between
155	+	* values that trade off overhead versus throughput.
156	+	*
157		* <p>The concurrency properties of bulk operations follow
158		* from those of ConcurrentHashMapV8: Any non-null result returned
159		* from {@code get(key)} and related access methods bears a
#	Line 189 | Line 196 | import java.io.Serializable;
196		* exceptions, or would have done so if the first exception had
197		* not occurred.
198		*
199	<	* <p>Parallel speedups for bulk operations compared to sequential
200	<	* processing are common but not guaranteed.  Operations involving
201	<	* brief functions on small maps may execute more slowly than
202	<	* sequential loops if the underlying work to parallelize the
203	<	* computation is more expensive than the computation itself.
204	<	* Similarly, parallelization may not lead to much actual parallelism
205	<	* if all processors are busy performing unrelated tasks.
199	>	* <p>Speedups for parallel compared to sequential forms are common
200	>	* but not guaranteed.  Parallel operations involving brief functions
201	>	* on small maps may execute more slowly than sequential forms if the
202	>	* underlying work to parallelize the computation is more expensive
203	>	* than the computation itself.  Similarly, parallelization may not
204	>	* lead to much actual parallelism if all processors are busy
205	>	* performing unrelated tasks.
206		*
207		* <p>All arguments to all task methods must be non-null.
208		*
#	Line 212 | Line 219 | import java.io.Serializable;
219		* @param <K> the type of keys maintained by this map
220		* @param <V> the type of mapped values
221		*/
222	<	public class ConcurrentHashMapV8<K, V>
223	<	implements ConcurrentMap<K, V>, Serializable {
222	>	public class ConcurrentHashMapV8<K,V> extends AbstractMap<K,V>
223	>	implements ConcurrentMap<K,V>, Serializable {
224		private static final long serialVersionUID = 7249069246763182397L;
225
226		/**
227	<	* A partitionable iterator. A Spliterator can be traversed
228	<	* directly, but can also be partitioned (before traversal) by
229	<	* creating another Spliterator that covers a non-overlapping
223	<	* portion of the elements, and so may be amenable to parallel
224	<	* execution.
225	<	*
226	<	* <p>This interface exports a subset of expected JDK8
227	<	* functionality.
228	<	*
229	<	* <p>Sample usage: Here is one (of the several) ways to compute
230	<	* the sum of the values held in a map using the ForkJoin
231	<	* framework. As illustrated here, Spliterators are well suited to
232	<	* designs in which a task repeatedly splits off half its work
233	<	* into forked subtasks until small enough to process directly,
234	<	* and then joins these subtasks. Variants of this style can also
235	<	* be used in completion-based designs.
236	<	*
237	<	* <pre>
238	<	* {@code ConcurrentHashMapV8<String, Long> m = ...
239	<	* // split as if have 8 * parallelism, for load balance
240	<	* int n = m.size();
241	<	* int p = aForkJoinPool.getParallelism() * 8;
242	<	* int split = (n < p)? n : p;
243	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
244	<	* // ...
245	<	* static class SumValues extends RecursiveTask<Long> {
246	<	*   final Spliterator<Long> s;
247	<	*   final int split;             // split while > 1
248	<	*   final SumValues nextJoin;    // records forked subtasks to join
249	<	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
250	<	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
251	<	*   }
252	<	*   public Long compute() {
253	<	*     long sum = 0;
254	<	*     SumValues subtasks = null; // fork subtasks
255	<	*     for (int s = split >>> 1; s > 0; s >>>= 1)
256	<	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
257	<	*     while (s.hasNext())        // directly process remaining elements
258	<	*       sum += s.next();
259	<	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
260	<	*       sum += t.join();         // collect subtask results
261	<	*     return sum;
262	<	*   }
263	<	* }
264	<	* }</pre>
227	>	* An object for traversing and partitioning elements of a source.
228	>	* This interface provides a subset of the functionality of JDK8
229	>	* java.util.Spliterator.
230		*/
231	<	public static interface Spliterator<T> extends Iterator<T> {
231	>	public static interface ConcurrentHashMapSpliterator<T> {
232		/**
233	<	* Returns a Spliterator covering approximately half of the
234	<	* elements, guaranteed not to overlap with those subsequently
235	<	* returned by this Spliterator.  After invoking this method,
236	<	* the current Spliterator will <em>not</em> produce any of
237	<	* the elements of the returned Spliterator, but the two
238	<	* Spliterators together will produce all of the elements that
239	<	* would have been produced by this Spliterator had this
240	<	* method not been called. The exact number of elements
241	<	* produced by the returned Spliterator is not guaranteed, and
277	<	* may be zero (i.e., with {@code hasNext()} reporting {@code
278	<	* false}) if this Spliterator cannot be further split.
279	<	*
280	<	* @return a Spliterator covering approximately half of the
281	<	* elements
282	<	* @throws IllegalStateException if this Spliterator has
283	<	* already commenced traversing elements
233	>	* If possible, returns a new spliterator covering
234	>	* approximately one half of the elements, which will not be
235	>	* covered by this spliterator. Returns null if cannot be
236	>	* split.
237	>	*/
238	>	ConcurrentHashMapSpliterator<T> trySplit();
239	>	/**
240	>	* Returns an estimate of the number of elements covered by
241	>	* this Spliterator.
242		*/
243	<	Spliterator<T> split();
243	>	long estimateSize();
244	>
245	>	/** Applies the action to each untraversed element */
246	>	void forEachRemaining(Action<? super T> action);
247	>	/** If an element remains, applies the action and returns true. */
248	>	boolean tryAdvance(Action<? super T> action);
249		}
250
251	+	// Sams
252	+	/** Interface describing a void action of one argument */
253	+	public interface Action<A> { void apply(A a); }
254	+	/** Interface describing a void action of two arguments */
255	+	public interface BiAction<A,B> { void apply(A a, B b); }
256	+	/** Interface describing a function of one argument */
257	+	public interface Fun<A,T> { T apply(A a); }
258	+	/** Interface describing a function of two arguments */
259	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
260	+	/** Interface describing a function mapping its argument to a double */
261	+	public interface ObjectToDouble<A> { double apply(A a); }
262	+	/** Interface describing a function mapping its argument to a long */
263	+	public interface ObjectToLong<A> { long apply(A a); }
264	+	/** Interface describing a function mapping its argument to an int */
265	+	public interface ObjectToInt<A> {int apply(A a); }
266	+	/** Interface describing a function mapping two arguments to a double */
267	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
268	+	/** Interface describing a function mapping two arguments to a long */
269	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
270	+	/** Interface describing a function mapping two arguments to an int */
271	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
272	+	/** Interface describing a function mapping two doubles to a double */
273	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
274	+	/** Interface describing a function mapping two longs to a long */
275	+	public interface LongByLongToLong { long apply(long a, long b); }
276	+	/** Interface describing a function mapping two ints to an int */
277	+	public interface IntByIntToInt { int apply(int a, int b); }
278	+
279	+
280		/*
281		* Overview:
282		*
#	Line 295 | Line 287 | public class ConcurrentHashMapV8<K, V>
287		* the same or better than java.util.HashMap, and to support high
288		* initial insertion rates on an empty table by many threads.
289		*
290	<	* Each key-value mapping is held in a Node.  Because Node fields
291	<	* can contain special values, they are defined using plain Object
292	<	* types. Similarly in turn, all internal methods that use them
293	<	* work off Object types. And similarly, so do the internal
294	<	* methods of auxiliary iterator and view classes. This also
295	<	* allows many of the public methods to be factored into a smaller
296	<	* number of internal methods (although sadly not so for the five
297	<	* variants of put-related operations). The validation-based
298	<	* approach explained below leads to a lot of code sprawl because
299	<	* retry-control precludes factoring into smaller methods.
290	>	* This map usually acts as a binned (bucketed) hash table.  Each
291	>	* key-value mapping is held in a Node.  Most nodes are instances
292	>	* of the basic Node class with hash, key, value, and next
293	>	* fields. However, various subclasses exist: TreeNodes are
294	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
295	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
296	>	* of bins during resizing. ReservationNodes are used as
297	>	* placeholders while establishing values in computeIfAbsent and
298	>	* related methods.  The types TreeBin, ForwardingNode, and
299	>	* ReservationNode do not hold normal user keys, values, or
300	>	* hashes, and are readily distinguishable during search etc
301	>	* because they have negative hash fields and null key and value
302	>	* fields. (These special nodes are either uncommon or transient,
303	>	* so the impact of carrying around some unused fields is
304	>	* insignificant.)
305		*
306		* The table is lazily initialized to a power-of-two size upon the
307		* first insertion.  Each bin in the table normally contains a
#	Line 312 | Line 309 | public class ConcurrentHashMapV8<K, V>
309		* Table accesses require volatile/atomic reads, writes, and
310		* CASes.  Because there is no other way to arrange this without
311		* adding further indirections, we use intrinsics
312	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
316	<	* are always accurately traversable under volatile reads, so long
317	<	* as lookups check hash code and non-nullness of value before
318	<	* checking key equality.
312	>	* (sun.misc.Unsafe) operations.
313		*
314		* We use the top (sign) bit of Node hash fields for control
315		* purposes -- it is available anyway because of addressing
316	<	* constraints.  Nodes with negative hash fields are forwarding
317	<	* nodes to either TreeBins or resized tables.  The lower 31 bits
324	<	* of each normal Node's hash field contain a transformation of
325	<	* the key's hash code.
316	>	* constraints.  Nodes with negative hash fields are specially
317	>	* handled or ignored in map methods.
318		*
319		* Insertion (via put or its variants) of the first node in an
320		* empty bin is performed by just CASing it to the bin.  This is
#	Line 339 | Line 331 | public class ConcurrentHashMapV8<K, V>
331		* validate that it is still the first node after locking it, and
332		* retry if not. Because new nodes are always appended to lists,
333		* once a node is first in a bin, it remains first until deleted
334	<	* or the bin becomes invalidated (upon resizing).  However,
343	<	* operations that only conditionally update may inspect nodes
344	<	* until the point of update. This is a converse of sorts to the
345	<	* lazy locking technique described by Herlihy & Shavit.
334	>	* or the bin becomes invalidated (upon resizing).
335		*
336		* The main disadvantage of per-bin locks is that other update
337		* operations on other nodes in a bin list protected by the same
#	Line 375 | Line 364 | public class ConcurrentHashMapV8<K, V>
364		* sometimes deviate significantly from uniform randomness.  This
365		* includes the case when N > (1<<30), so some keys MUST collide.
366		* Similarly for dumb or hostile usages in which multiple keys are
367	<	* designed to have identical hash codes. Also, although we guard
368	<	* against the worst effects of this (see method spread), sets of
369	<	* hashes may differ only in bits that do not impact their bin
370	<	* index for a given power-of-two mask.  So we use a secondary
371	<	* strategy that applies when the number of nodes in a bin exceeds
372	<	* a threshold, and at least one of the keys implements
384	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
385	<	* (a specialized form of red-black trees), bounding search time
386	<	* to O(log N).  Each search step in a TreeBin is around twice as
367	>	* designed to have identical hash codes or ones that differs only
368	>	* in masked-out high bits. So we use a secondary strategy that
369	>	* applies when the number of nodes in a bin exceeds a
370	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
371	>	* specialized form of red-black trees), bounding search time to
372	>	* O(log N).  Each search step in a TreeBin is at least twice as
373		* slow as in a regular list, but given that N cannot exceed
374		* (1<<64) (before running out of addresses) this bounds search
375		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 396 | Line 382 | public class ConcurrentHashMapV8<K, V>
382		* The table is resized when occupancy exceeds a percentage
383		* threshold (nominally, 0.75, but see below).  Any thread
384		* noticing an overfull bin may assist in resizing after the
385	<	* initiating thread allocates and sets up the replacement
386	<	* array. However, rather than stalling, these other threads may
387	<	* proceed with insertions etc.  The use of TreeBins shields us
388	<	* from the worst case effects of overfilling while resizes are in
385	>	* initiating thread allocates and sets up the replacement array.
386	>	* However, rather than stalling, these other threads may proceed
387	>	* with insertions etc.  The use of TreeBins shields us from the
388	>	* worst case effects of overfilling while resizes are in
389		* progress.  Resizing proceeds by transferring bins, one by one,
390	<	* from the table to the next table. To enable concurrency, the
391	<	* next table must be (incrementally) prefilled with place-holders
392	<	* serving as reverse forwarders to the old table.  Because we are
390	>	* from the table to the next table. However, threads claim small
391	>	* blocks of indices to transfer (via field transferIndex) before
392	>	* doing so, reducing contention.  A generation stamp in field
393	>	* sizeCtl ensures that resizings do not overlap. Because we are
394		* using power-of-two expansion, the elements from each bin must
395		* either stay at same index, or move with a power of two
396		* offset. We eliminate unnecessary node creation by catching
#	Line 424 | Line 411 | public class ConcurrentHashMapV8<K, V>
411		* locks, average aggregate waits become shorter as resizing
412		* progresses.  The transfer operation must also ensure that all
413		* accessible bins in both the old and new table are usable by any
414	<	* traversal.  This is arranged by proceeding from the last bin
415	<	* (table.length - 1) up towards the first.  Upon seeing a
416	<	* forwarding node, traversals (see class Traverser) arrange to
417	<	* move to the new table without revisiting nodes.  However, to
418	<	* ensure that no intervening nodes are skipped, bin splitting can
419	<	* only begin after the associated reverse-forwarders are in
420	<	* place.
414	>	* traversal.  This is arranged in part by proceeding from the
415	>	* last bin (table.length - 1) up towards the first.  Upon seeing
416	>	* a forwarding node, traversals (see class Traverser) arrange to
417	>	* move to the new table without revisiting nodes.  To ensure that
418	>	* no intervening nodes are skipped even when moved out of order,
419	>	* a stack (see class TableStack) is created on first encounter of
420	>	* a forwarding node during a traversal, to maintain its place if
421	>	* later processing the current table. The need for these
422	>	* save/restore mechanics is relatively rare, but when one
423	>	* forwarding node is encountered, typically many more will be.
424	>	* So Traversers use a simple caching scheme to avoid creating so
425	>	* many new TableStack nodes. (Thanks to Peter Levart for
426	>	* suggesting use of a stack here.)
427		*
428		* The traversal scheme also applies to partial traversals of
429		* ranges of bins (via an alternate Traverser constructor)
#	Line 456 | Line 449 | public class ConcurrentHashMapV8<K, V>
449		* bin already holding two or more nodes. Under uniform hash
450		* distributions, the probability of this occurring at threshold
451		* is around 13%, meaning that only about 1 in 8 puts check
452	<	* threshold (and after resizing, many fewer do so). The bulk
453	<	* putAll operation further reduces contention by only committing
454	<	* count updates upon these size checks.
452	>	* threshold (and after resizing, many fewer do so).
453	>	*
454	>	* TreeBins use a special form of comparison for search and
455	>	* related operations (which is the main reason we cannot use
456	>	* existing collections such as TreeMaps). TreeBins contain
457	>	* Comparable elements, but may contain others, as well as
458	>	* elements that are Comparable but not necessarily Comparable for
459	>	* the same T, so we cannot invoke compareTo among them. To handle
460	>	* this, the tree is ordered primarily by hash value, then by
461	>	* Comparable.compareTo order if applicable.  On lookup at a node,
462	>	* if elements are not comparable or compare as 0 then both left
463	>	* and right children may need to be searched in the case of tied
464	>	* hash values. (This corresponds to the full list search that
465	>	* would be necessary if all elements were non-Comparable and had
466	>	* tied hashes.) On insertion, to keep a total ordering (or as
467	>	* close as is required here) across rebalancings, we compare
468	>	* classes and identityHashCodes as tie-breakers. The red-black
469	>	* balancing code is updated from pre-jdk-collections
470	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
471	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
472	>	* Algorithms" (CLR).
473	>	*
474	>	* TreeBins also require an additional locking mechanism.  While
475	>	* list traversal is always possible by readers even during
476	>	* updates, tree traversal is not, mainly because of tree-rotations
477	>	* that may change the root node and/or its linkages.  TreeBins
478	>	* include a simple read-write lock mechanism parasitic on the
479	>	* main bin-synchronization strategy: Structural adjustments
480	>	* associated with an insertion or removal are already bin-locked
481	>	* (and so cannot conflict with other writers) but must wait for
482	>	* ongoing readers to finish. Since there can be only one such
483	>	* waiter, we use a simple scheme using a single "waiter" field to
484	>	* block writers.  However, readers need never block.  If the root
485	>	* lock is held, they proceed along the slow traversal path (via
486	>	* next-pointers) until the lock becomes available or the list is
487	>	* exhausted, whichever comes first. These cases are not fast, but
488	>	* maximize aggregate expected throughput.
489		*
490		* Maintaining API and serialization compatibility with previous
491		* versions of this class introduces several oddities. Mainly: We
#	Line 468 | Line 495 | public class ConcurrentHashMapV8<K, V>
495		* time that we can guarantee to honor it.) We also declare an
496		* unused "Segment" class that is instantiated in minimal form
497		* only when serializing.
498	+	*
499	+	* Also, solely for compatibility with previous versions of this
500	+	* class, it extends AbstractMap, even though all of its methods
501	+	* are overridden, so it is just useless baggage.
502	+	*
503	+	* This file is organized to make things a little easier to follow
504	+	* while reading than they might otherwise: First the main static
505	+	* declarations and utilities, then fields, then main public
506	+	* methods (with a few factorings of multiple public methods into
507	+	* internal ones), then sizing methods, trees, traversers, and
508	+	* bulk operations.
509		*/
510
511		/* ---------------- Constants -------------- */
#	Line 510 | Line 548 | public class ConcurrentHashMapV8<K, V>
548
549		/**
550		* The bin count threshold for using a tree rather than list for a
551	<	* bin.  The value reflects the approximate break-even point for
552	<	* using tree-based operations.
551	>	* bin.  Bins are converted to trees when adding an element to a
552	>	* bin with at least this many nodes. The value must be greater
553	>	* than 2, and should be at least 8 to mesh with assumptions in
554	>	* tree removal about conversion back to plain bins upon
555	>	* shrinkage.
556	>	*/
557	>	static final int TREEIFY_THRESHOLD = 8;
558	>
559	>	/**
560	>	* The bin count threshold for untreeifying a (split) bin during a
561	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
562	>	* most 6 to mesh with shrinkage detection under removal.
563		*/
564	<	private static final int TREE_THRESHOLD = 8;
564	>	static final int UNTREEIFY_THRESHOLD = 6;
565	>
566	>	/**
567	>	* The smallest table capacity for which bins may be treeified.
568	>	* (Otherwise the table is resized if too many nodes in a bin.)
569	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
570	>	* conflicts between resizing and treeification thresholds.
571	>	*/
572	>	static final int MIN_TREEIFY_CAPACITY = 64;
573
574		/**
575		* Minimum number of rebinnings per transfer step. Ranges are
#	Line 524 | Line 580 | public class ConcurrentHashMapV8<K, V>
580		*/
581		private static final int MIN_TRANSFER_STRIDE = 16;
582
583	+	/**
584	+	* The number of bits used for generation stamp in sizeCtl.
585	+	* Must be at least 6 for 32bit arrays.
586	+	*/
587	+	private static int RESIZE_STAMP_BITS = 16;
588	+
589	+	/**
590	+	* The maximum number of threads that can help resize.
591	+	* Must fit in 32 - RESIZE_STAMP_BITS bits.
592	+	*/
593	+	private static final int MAX_RESIZERS = (1 << (32 - RESIZE_STAMP_BITS)) - 1;
594	+
595	+	/**
596	+	* The bit shift for recording size stamp in sizeCtl.
597	+	*/
598	+	private static final int RESIZE_STAMP_SHIFT = 32 - RESIZE_STAMP_BITS;
599	+
600		/*
601		* Encodings for Node hash fields. See above for explanation.
602		*/
603	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
603	>	static final int MOVED     = -1; // hash for forwarding nodes
604	>	static final int TREEBIN   = -2; // hash for roots of trees
605	>	static final int RESERVED  = -3; // hash for transient reservations
606		static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
607
608		/** Number of CPUS, to place bounds on some sizings */
609		static final int NCPU = Runtime.getRuntime().availableProcessors();
610
611	<	/* ---------------- Counters -------------- */
611	>	/** For serialization compatibility. */
612	>	private static final ObjectStreamField[] serialPersistentFields = {
613	>	new ObjectStreamField("segments", Segment[].class),
614	>	new ObjectStreamField("segmentMask", Integer.TYPE),
615	>	new ObjectStreamField("segmentShift", Integer.TYPE)
616	>	};
617
618	<	// Adapted from LongAdder and Striped64.
539	<	// See their internal docs for explanation.
618	>	/* ---------------- Nodes -------------- */
619
620	<	// A padded cell for distributing counts
621	<	static final class CounterCell {
622	<	volatile long p0, p1, p2, p3, p4, p5, p6;
623	<	volatile long value;
624	<	volatile long q0, q1, q2, q3, q4, q5, q6;
625	<	CounterCell(long x) { value = x; }
620	>	/**
621	>	* Key-value entry.  This class is never exported out as a
622	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
623	>	* MapEntry below), but can be used for read-only traversals used
624	>	* in bulk tasks.  Subclasses of Node with a negative hash field
625	>	* are special, and contain null keys and values (but are never
626	>	* exported).  Otherwise, keys and vals are never null.
627	>	*/
628	>	static class Node<K,V> implements Map.Entry<K,V> {
629	>	final int hash;
630	>	final K key;
631	>	volatile V val;
632	>	volatile Node<K,V> next;
633	>
634	>	Node(int hash, K key, V val, Node<K,V> next) {
635	>	this.hash = hash;
636	>	this.key = key;
637	>	this.val = val;
638	>	this.next = next;
639	>	}
640	>
641	>	public final K getKey()       { return key; }
642	>	public final V getValue()     { return val; }
643	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
644	>	public final String toString(){ return key + "=" + val; }
645	>	public final V setValue(V value) {
646	>	throw new UnsupportedOperationException();
647	>	}
648	>
649	>	public final boolean equals(Object o) {
650	>	Object k, v, u; Map.Entry<?,?> e;
651	>	return ((o instanceof Map.Entry) &&
652	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
653	>	(v = e.getValue()) != null &&
654	>	(k == key || k.equals(key)) &&
655	>	(v == (u = val) || v.equals(u)));
656	>	}
657	>
658	>	/**
659	>	* Virtualized support for map.get(); overridden in subclasses.
660	>	*/
661	>	Node<K,V> find(int h, Object k) {
662	>	Node<K,V> e = this;
663	>	if (k != null) {
664	>	do {
665	>	K ek;
666	>	if (e.hash == h &&
667	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
668	>	return e;
669	>	} while ((e = e.next) != null);
670	>	}
671	>	return null;
672	>	}
673		}
674
675	+	/* ---------------- Static utilities -------------- */
676	+
677		/**
678	<	* Holder for the thread-local hash code determining which
679	<	* CounterCell to use. The code is initialized via the
680	<	* counterHashCodeGenerator, but may be moved upon collisions.
678	>	* Spreads (XORs) higher bits of hash to lower and also forces top
679	>	* bit to 0. Because the table uses power-of-two masking, sets of
680	>	* hashes that vary only in bits above the current mask will
681	>	* always collide. (Among known examples are sets of Float keys
682	>	* holding consecutive whole numbers in small tables.)  So we
683	>	* apply a transform that spreads the impact of higher bits
684	>	* downward. There is a tradeoff between speed, utility, and
685	>	* quality of bit-spreading. Because many common sets of hashes
686	>	* are already reasonably distributed (so don't benefit from
687	>	* spreading), and because we use trees to handle large sets of
688	>	* collisions in bins, we just XOR some shifted bits in the
689	>	* cheapest possible way to reduce systematic lossage, as well as
690	>	* to incorporate impact of the highest bits that would otherwise
691	>	* never be used in index calculations because of table bounds.
692		*/
693	<	static final class CounterHashCode {
694	<	int code;
693	>	static final int spread(int h) {
694	>	return (h ^ (h >>> 16)) & HASH_BITS;
695		}
696
697		/**
698	<	* Generates initial value for per-thread CounterHashCodes
698	>	* Returns a power of two table size for the given desired capacity.
699	>	* See Hackers Delight, sec 3.2
700		*/
701	<	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
701	>	private static final int tableSizeFor(int c) {
702	>	int n = c - 1;
703	>	n |= n >>> 1;
704	>	n |= n >>> 2;
705	>	n |= n >>> 4;
706	>	n |= n >>> 8;
707	>	n |= n >>> 16;
708	>	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
709	>	}
710
711		/**
712	<	* Increment for counterHashCodeGenerator. See class ThreadLocal
713	<	* for explanation.
712	>	* Returns x's Class if it is of the form "class C implements
713	>	* Comparable<C>", else null.
714		*/
715	<	static final int SEED_INCREMENT = 0x61c88647;
715	>	static Class<?> comparableClassFor(Object x) {
716	>	if (x instanceof Comparable) {
717	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
718	>	if ((c = x.getClass()) == String.class) // bypass checks
719	>	return c;
720	>	if ((ts = c.getGenericInterfaces()) != null) {
721	>	for (int i = 0; i < ts.length; ++i) {
722	>	if (((t = ts[i]) instanceof ParameterizedType) &&
723	>	((p = (ParameterizedType)t).getRawType() ==
724	>	Comparable.class) &&
725	>	(as = p.getActualTypeArguments()) != null &&
726	>	as.length == 1 && as[0] == c) // type arg is c
727	>	return c;
728	>	}
729	>	}
730	>	}
731	>	return null;
732	>	}
733
734		/**
735	<	* Per-thread counter hash codes. Shared across all instances
735	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
736	>	* class), else 0.
737		*/
738	<	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
739	<	new ThreadLocal<CounterHashCode>();
738	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
739	>	static int compareComparables(Class<?> kc, Object k, Object x) {
740	>	return (x == null || x.getClass() != kc ? 0 :
741	>	((Comparable)k).compareTo(x));
742	>	}
743	>
744	>	/* ---------------- Table element access -------------- */
745	>
746	>	/*
747	>	* Volatile access methods are used for table elements as well as
748	>	* elements of in-progress next table while resizing.  All uses of
749	>	* the tab arguments must be null checked by callers.  All callers
750	>	* also paranoically precheck that tab's length is not zero (or an
751	>	* equivalent check), thus ensuring that any index argument taking
752	>	* the form of a hash value anded with (length - 1) is a valid
753	>	* index.  Note that, to be correct wrt arbitrary concurrency
754	>	* errors by users, these checks must operate on local variables,
755	>	* which accounts for some odd-looking inline assignments below.
756	>	* Note that calls to setTabAt always occur within locked regions,
757	>	* and so in principle require only release ordering, not
758	>	* full volatile semantics, but are currently coded as volatile
759	>	* writes to be conservative.
760	>	*/
761	>
762	>	@SuppressWarnings("unchecked")
763	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
764	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
765	>	}
766	>
767	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
768	>	Node<K,V> c, Node<K,V> v) {
769	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
770	>	}
771	>
772	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
773	>	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
774	>	}
775
776		/* ---------------- Fields -------------- */
777
#	Line 578 | Line 779 | public class ConcurrentHashMapV8<K, V>
779		* The array of bins. Lazily initialized upon first insertion.
780		* Size is always a power of two. Accessed directly by iterators.
781		*/
782	<	transient volatile Node[] table;
782	>	transient volatile Node<K,V>[] table;
783
784		/**
785		* The next table to use; non-null only while resizing.
786		*/
787	<	private transient volatile Node[] nextTable;
787	>	private transient volatile Node<K,V>[] nextTable;
788
789		/**
790		* Base counter value, used mainly when there is no contention,
#	Line 608 | Line 809 | public class ConcurrentHashMapV8<K, V>
809		private transient volatile int transferIndex;
810
811		/**
812	<	* The least available table index to split while resizing.
612	<	*/
613	<	private transient volatile int transferOrigin;
614	<
615	<	/**
616	<	* Spinlock (locked via CAS) used when resizing and/or creating Cells.
812	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
813		*/
814	<	private transient volatile int counterBusy;
814	>	private transient volatile int cellsBusy;
815
816		/**
817		* Table of counter cells. When non-null, size is a power of 2.
#	Line 627 | Line 823 | public class ConcurrentHashMapV8<K, V>
823		private transient ValuesView<K,V> values;
824		private transient EntrySetView<K,V> entrySet;
825
630	–	/** For serialization compatibility. Null unless serialized; see below */
631	–	private Segment<K,V>[] segments;
826
827	<	/* ---------------- Table element access -------------- */
827	>	/* ---------------- Public operations -------------- */
828
829	<	/*
830	<	* Volatile access methods are used for table elements as well as
637	<	* elements of in-progress next table while resizing.  Uses are
638	<	* null checked by callers, and implicitly bounds-checked, relying
639	<	* on the invariants that tab arrays have non-zero size, and all
640	<	* indices are masked with (tab.length - 1) which is never
641	<	* negative and always less than length. Note that, to be correct
642	<	* wrt arbitrary concurrency errors by users, bounds checks must
643	<	* operate on local variables, which accounts for some odd-looking
644	<	* inline assignments below.
829	>	/**
830	>	* Creates a new, empty map with the default initial table size (16).
831		*/
832	<
647	<	static final Node tabAt(Node[] tab, int i) { // used by Traverser
648	<	return (Node)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
832	>	public ConcurrentHashMapV8() {
833		}
834
835	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
836	<	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
835	>	/**
836	>	* Creates a new, empty map with an initial table size
837	>	* accommodating the specified number of elements without the need
838	>	* to dynamically resize.
839	>	*
840	>	* @param initialCapacity The implementation performs internal
841	>	* sizing to accommodate this many elements.
842	>	* @throws IllegalArgumentException if the initial capacity of
843	>	* elements is negative
844	>	*/
845	>	public ConcurrentHashMapV8(int initialCapacity) {
846	>	if (initialCapacity < 0)
847	>	throw new IllegalArgumentException();
848	>	int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
849	>	MAXIMUM_CAPACITY :
850	>	tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
851	>	this.sizeCtl = cap;
852		}
853
854	<	private static final void setTabAt(Node[] tab, int i, Node v) {
855	<	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
854	>	/**
855	>	* Creates a new map with the same mappings as the given map.
856	>	*
857	>	* @param m the map
858	>	*/
859	>	public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
860	>	this.sizeCtl = DEFAULT_CAPACITY;
861	>	putAll(m);
862		}
863
659	–	/* ---------------- Nodes -------------- */
660	–
864		/**
865	<	* Key-value entry. Note that this is never exported out as a
866	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
867	<	* field of MOVED are special, and do not contain user keys or
868	<	* values.  Otherwise, keys are never null, and null val fields
869	<	* indicate that a node is in the process of being deleted or
870	<	* created. For purposes of read-only access, a key may be read
871	<	* before a val, but can only be used after checking val to be
872	<	* non-null.
865	>	* Creates a new, empty map with an initial table size based on
866	>	* the given number of elements ({@code initialCapacity}) and
867	>	* initial table density ({@code loadFactor}).
868	>	*
869	>	* @param initialCapacity the initial capacity. The implementation
870	>	* performs internal sizing to accommodate this many elements,
871	>	* given the specified load factor.
872	>	* @param loadFactor the load factor (table density) for
873	>	* establishing the initial table size
874	>	* @throws IllegalArgumentException if the initial capacity of
875	>	* elements is negative or the load factor is nonpositive
876	>	*
877	>	* @since 1.6
878		*/
879	<	static class Node {
880	<	final int hash;
881	<	final Object key;
674	<	volatile Object val;
675	<	volatile Node next;
879	>	public ConcurrentHashMapV8(int initialCapacity, float loadFactor) {
880	>	this(initialCapacity, loadFactor, 1);
881	>	}
882
883	<	Node(int hash, Object key, Object val, Node next) {
884	<	this.hash = hash;
885	<	this.key = key;
886	<	this.val = val;
887	<	this.next = next;
888	<	}
883	>	/**
884	>	* Creates a new, empty map with an initial table size based on
885	>	* the given number of elements ({@code initialCapacity}), table
886	>	* density ({@code loadFactor}), and number of concurrently
887	>	* updating threads ({@code concurrencyLevel}).
888	>	*
889	>	* @param initialCapacity the initial capacity. The implementation
890	>	* performs internal sizing to accommodate this many elements,
891	>	* given the specified load factor.
892	>	* @param loadFactor the load factor (table density) for
893	>	* establishing the initial table size
894	>	* @param concurrencyLevel the estimated number of concurrently
895	>	* updating threads. The implementation may use this value as
896	>	* a sizing hint.
897	>	* @throws IllegalArgumentException if the initial capacity is
898	>	* negative or the load factor or concurrencyLevel are
899	>	* nonpositive
900	>	*/
901	>	public ConcurrentHashMapV8(int initialCapacity,
902	>	float loadFactor, int concurrencyLevel) {
903	>	if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
904	>	throw new IllegalArgumentException();
905	>	if (initialCapacity < concurrencyLevel)   // Use at least as many bins
906	>	initialCapacity = concurrencyLevel;   // as estimated threads
907	>	long size = (long)(1.0 + (long)initialCapacity / loadFactor);
908	>	int cap = (size >= (long)MAXIMUM_CAPACITY) ?
909	>	MAXIMUM_CAPACITY : tableSizeFor((int)size);
910	>	this.sizeCtl = cap;
911		}
912
913	<	/* ---------------- TreeBins -------------- */
913	>	// Original (since JDK1.2) Map methods
914
915		/**
916	<	* Nodes for use in TreeBins
916	>	* {@inheritDoc}
917		*/
918	<	static final class TreeNode extends Node {
919	<	TreeNode parent;  // red-black tree links
920	<	TreeNode left;
921	<	TreeNode right;
922	<	TreeNode prev;    // needed to unlink next upon deletion
923	<	boolean red;
918	>	public int size() {
919	>	long n = sumCount();
920	>	return ((n < 0L) ? 0 :
921	>	(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
922	>	(int)n);
923	>	}
924
925	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
926	<	super(hash, key, val, next);
927	<	this.parent = parent;
928	<	}
925	>	/**
926	>	* {@inheritDoc}
927	>	*/
928	>	public boolean isEmpty() {
929	>	return sumCount() <= 0L; // ignore transient negative values
930		}
931
932		/**
933	<	* A specialized form of red-black tree for use in bins
934	<	* whose size exceeds a threshold.
933	>	* Returns the value to which the specified key is mapped,
934	>	* or {@code null} if this map contains no mapping for the key.
935		*
936	<	* TreeBins use a special form of comparison for search and
937	<	* related operations (which is the main reason we cannot use
938	<	* existing collections such as TreeMaps). TreeBins contain
939	<	* Comparable elements, but may contain others, as well as
711	<	* elements that are Comparable but not necessarily Comparable<T>
712	<	* for the same T, so we cannot invoke compareTo among them. To
713	<	* handle this, the tree is ordered primarily by hash value, then
714	<	* by getClass().getName() order, and then by Comparator order
715	<	* among elements of the same class.  On lookup at a node, if
716	<	* elements are not comparable or compare as 0, both left and
717	<	* right children may need to be searched in the case of tied hash
718	<	* values. (This corresponds to the full list search that would be
719	<	* necessary if all elements were non-Comparable and had tied
720	<	* hashes.)  The red-black balancing code is updated from
721	<	* pre-jdk-collections
722	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
723	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
724	<	* Algorithms" (CLR).
936	>	* <p>More formally, if this map contains a mapping from a key
937	>	* {@code k} to a value {@code v} such that {@code key.equals(k)},
938	>	* then this method returns {@code v}; otherwise it returns
939	>	* {@code null}.  (There can be at most one such mapping.)
940		*
941	<	* TreeBins also maintain a separate locking discipline than
727	<	* regular bins. Because they are forwarded via special MOVED
728	<	* nodes at bin heads (which can never change once established),
729	<	* we cannot use those nodes as locks. Instead, TreeBin
730	<	* extends AbstractQueuedSynchronizer to support a simple form of
731	<	* read-write lock. For update operations and table validation,
732	<	* the exclusive form of lock behaves in the same way as bin-head
733	<	* locks. However, lookups use shared read-lock mechanics to allow
734	<	* multiple readers in the absence of writers.  Additionally,
735	<	* these lookups do not ever block: While the lock is not
736	<	* available, they proceed along the slow traversal path (via
737	<	* next-pointers) until the lock becomes available or the list is
738	<	* exhausted, whichever comes first. (These cases are not fast,
739	<	* but maximize aggregate expected throughput.)  The AQS mechanics
740	<	* for doing this are straightforward.  The lock state is held as
741	<	* AQS getState().  Read counts are negative; the write count (1)
742	<	* is positive.  There are no signalling preferences among readers
743	<	* and writers. Since we don't need to export full Lock API, we
744	<	* just override the minimal AQS methods and use them directly.
941	>	* @throws NullPointerException if the specified key is null
942		*/
943	<	static final class TreeBin extends AbstractQueuedSynchronizer {
944	<	private static final long serialVersionUID = 2249069246763182397L;
945	<	transient TreeNode root;  // root of tree
946	<	transient TreeNode first; // head of next-pointer list
947	<
948	<	/* AQS overrides */
949	<	public final boolean isHeldExclusively() { return getState() > 0; }
950	<	public final boolean tryAcquire(int ignore) {
951	<	if (compareAndSetState(0, 1)) {
952	<	setExclusiveOwnerThread(Thread.currentThread());
953	<	return true;
954	<	}
955	<	return false;
956	<	}
957	<	public final boolean tryRelease(int ignore) {
761	<	setExclusiveOwnerThread(null);
762	<	setState(0);
763	<	return true;
764	<	}
765	<	public final int tryAcquireShared(int ignore) {
766	<	for (int c;;) {
767	<	if ((c = getState()) > 0)
768	<	return -1;
769	<	if (compareAndSetState(c, c -1))
770	<	return 1;
771	<	}
772	<	}
773	<	public final boolean tryReleaseShared(int ignore) {
774	<	int c;
775	<	do {} while (!compareAndSetState(c = getState(), c + 1));
776	<	return c == -1;
777	<	}
778	<
779	<	/** From CLR */
780	<	private void rotateLeft(TreeNode p) {
781	<	if (p != null) {
782	<	TreeNode r = p.right, pp, rl;
783	<	if ((rl = p.right = r.left) != null)
784	<	rl.parent = p;
785	<	if ((pp = r.parent = p.parent) == null)
786	<	root = r;
787	<	else if (pp.left == p)
788	<	pp.left = r;
789	<	else
790	<	pp.right = r;
791	<	r.left = p;
792	<	p.parent = r;
943	>	public V get(Object key) {
944	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
945	>	int h = spread(key.hashCode());
946	>	if ((tab = table) != null && (n = tab.length) > 0 &&
947	>	(e = tabAt(tab, (n - 1) & h)) != null) {
948	>	if ((eh = e.hash) == h) {
949	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
950	>	return e.val;
951	>	}
952	>	else if (eh < 0)
953	>	return (p = e.find(h, key)) != null ? p.val : null;
954	>	while ((e = e.next) != null) {
955	>	if (e.hash == h &&
956	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
957	>	return e.val;
958		}
959		}
960	+	return null;
961	+	}
962
963	<	/** From CLR */
964	<	private void rotateRight(TreeNode p) {
965	<	if (p != null) {
966	<	TreeNode l = p.left, pp, lr;
967	<	if ((lr = p.left = l.right) != null)
968	<	lr.parent = p;
969	<	if ((pp = l.parent = p.parent) == null)
970	<	root = l;
971	<	else if (pp.right == p)
972	<	pp.right = l;
973	<	else
974	<	pp.left = l;
808	<	l.right = p;
809	<	p.parent = l;
810	<	}
811	<	}
963	>	/**
964	>	* Tests if the specified object is a key in this table.
965	>	*
966	>	* @param  key possible key
967	>	* @return {@code true} if and only if the specified object
968	>	*         is a key in this table, as determined by the
969	>	*         {@code equals} method; {@code false} otherwise
970	>	* @throws NullPointerException if the specified key is null
971	>	*/
972	>	public boolean containsKey(Object key) {
973	>	return get(key) != null;
974	>	}
975
976	<	/**
977	<	* Returns the TreeNode (or null if not found) for the given key
978	<	* starting at given root.
979	<	*/
980	<	@SuppressWarnings("unchecked") final TreeNode getTreeNode
981	<	(int h, Object k, TreeNode p) {
982	<	Class<?> c = k.getClass();
983	<	while (p != null) {
984	<	int dir, ph;  Object pk; Class<?> pc;
985	<	if ((ph = p.hash) == h) {
986	<	if ((pk = p.key) == k || k.equals(pk))
987	<	return p;
988	<	if (c != (pc = pk.getClass()) ||
989	<	!(k instanceof Comparable) ||
990	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
991	<	if ((dir = (c == pc) ? 0 :
992	<	c.getName().compareTo(pc.getName())) == 0) {
993	<	TreeNode r = null, pl, pr; // check both sides
994	<	if ((pr = p.right) != null && h >= pr.hash &&
995	<	(r = getTreeNode(h, k, pr)) != null)
833	<	return r;
834	<	else if ((pl = p.left) != null && h <= pl.hash)
835	<	dir = -1;
836	<	else // nothing there
837	<	return null;
838	<	}
839	<	}
840	<	}
841	<	else
842	<	dir = (h < ph) ? -1 : 1;
843	<	p = (dir > 0) ? p.right : p.left;
976	>	/**
977	>	* Returns {@code true} if this map maps one or more keys to the
978	>	* specified value. Note: This method may require a full traversal
979	>	* of the map, and is much slower than method {@code containsKey}.
980	>	*
981	>	* @param value value whose presence in this map is to be tested
982	>	* @return {@code true} if this map maps one or more keys to the
983	>	*         specified value
984	>	* @throws NullPointerException if the specified value is null
985	>	*/
986	>	public boolean containsValue(Object value) {
987	>	if (value == null)
988	>	throw new NullPointerException();
989	>	Node<K,V>[] t;
990	>	if ((t = table) != null) {
991	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
992	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
993	>	V v;
994	>	if ((v = p.val) == value || (v != null && value.equals(v)))
995	>	return true;
996		}
845	–	return null;
997		}
998	+	return false;
999	+	}
1000
1001	<	/**
1002	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
1003	<	* read-lock to call getTreeNode, but during failure to get
1004	<	* lock, searches along next links.
1005	<	*/
1006	<	final Object getValue(int h, Object k) {
1007	<	Node r = null;
1008	<	int c = getState(); // Must read lock state first
1009	<	for (Node e = first; e != null; e = e.next) {
1010	<	if (c <= 0 && compareAndSetState(c, c - 1)) {
1011	<	try {
1012	<	r = getTreeNode(h, k, root);
1013	<	} finally {
1014	<	releaseShared(0);
1001	>	/**
1002	>	* Maps the specified key to the specified value in this table.
1003	>	* Neither the key nor the value can be null.
1004	>	*
1005	>	* <p>The value can be retrieved by calling the {@code get} method
1006	>	* with a key that is equal to the original key.
1007	>	*
1008	>	* @param key key with which the specified value is to be associated
1009	>	* @param value value to be associated with the specified key
1010	>	* @return the previous value associated with {@code key}, or
1011	>	*         {@code null} if there was no mapping for {@code key}
1012	>	* @throws NullPointerException if the specified key or value is null
1013	>	*/
1014	>	public V put(K key, V value) {
1015	>	return putVal(key, value, false);
1016	>	}
1017	>
1018	>	/** Implementation for put and putIfAbsent */
1019	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
1020	>	if (key == null || value == null) throw new NullPointerException();
1021	>	int hash = spread(key.hashCode());
1022	>	int binCount = 0;
1023	>	for (Node<K,V>[] tab = table;;) {
1024	>	Node<K,V> f; int n, i, fh;
1025	>	if (tab == null || (n = tab.length) == 0)
1026	>	tab = initTable();
1027	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
1028	>	if (casTabAt(tab, i, null,
1029	>	new Node<K,V>(hash, key, value, null)))
1030	>	break;                   // no lock when adding to empty bin
1031	>	}
1032	>	else if ((fh = f.hash) == MOVED)
1033	>	tab = helpTransfer(tab, f);
1034	>	else {
1035	>	V oldVal = null;
1036	>	synchronized (f) {
1037	>	if (tabAt(tab, i) == f) {
1038	>	if (fh >= 0) {
1039	>	binCount = 1;
1040	>	for (Node<K,V> e = f;; ++binCount) {
1041	>	K ek;
1042	>	if (e.hash == hash &&
1043	>	((ek = e.key) == key ||
1044	>	(ek != null && key.equals(ek)))) {
1045	>	oldVal = e.val;
1046	>	if (!onlyIfAbsent)
1047	>	e.val = value;
1048	>	break;
1049	>	}
1050	>	Node<K,V> pred = e;
1051	>	if ((e = e.next) == null) {
1052	>	pred.next = new Node<K,V>(hash, key,
1053	>	value, null);
1054	>	break;
1055	>	}
1056	>	}
1057	>	}
1058	>	else if (f instanceof TreeBin) {
1059	>	Node<K,V> p;
1060	>	binCount = 2;
1061	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1062	>	value)) != null) {
1063	>	oldVal = p.val;
1064	>	if (!onlyIfAbsent)
1065	>	p.val = value;
1066	>	}
1067	>	}
1068		}
863	–	break;
1069		}
1070	<	else if (e.hash == h && k.equals(e.key)) {
1071	<	r = e;
1070	>	if (binCount != 0) {
1071	>	if (binCount >= TREEIFY_THRESHOLD)
1072	>	treeifyBin(tab, i);
1073	>	if (oldVal != null)
1074	>	return oldVal;
1075		break;
1076		}
869	–	else
870	–	c = getState();
1077		}
872	–	return r == null ? null : r.val;
1078		}
1079	+	addCount(1L, binCount);
1080	+	return null;
1081	+	}
1082
1083	<	/**
1084	<	* Finds or adds a node.
1085	<	* @return null if added
1086	<	*/
1087	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
1088	<	(int h, Object k, Object v) {
1089	<	Class<?> c = k.getClass();
1090	<	TreeNode pp = root, p = null;
1091	<	int dir = 0;
1092	<	while (pp != null) { // find existing node or leaf to insert at
1093	<	int ph;  Object pk; Class<?> pc;
1094	<	p = pp;
887	<	if ((ph = p.hash) == h) {
888	<	if ((pk = p.key) == k || k.equals(pk))
889	<	return p;
890	<	if (c != (pc = pk.getClass()) ||
891	<	!(k instanceof Comparable) ||
892	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
893	<	TreeNode s = null, r = null, pr;
894	<	if ((dir = (c == pc) ? 0 :
895	<	c.getName().compareTo(pc.getName())) == 0) {
896	<	if ((pr = p.right) != null && h >= pr.hash &&
897	<	(r = getTreeNode(h, k, pr)) != null)
898	<	return r;
899	<	else // continue left
900	<	dir = -1;
901	<	}
902	<	else if ((pr = p.right) != null && h >= pr.hash)
903	<	s = pr;
904	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
905	<	return r;
906	<	}
907	<	}
908	<	else
909	<	dir = (h < ph) ? -1 : 1;
910	<	pp = (dir > 0) ? p.right : p.left;
911	<	}
1083	>	/**
1084	>	* Copies all of the mappings from the specified map to this one.
1085	>	* These mappings replace any mappings that this map had for any of the
1086	>	* keys currently in the specified map.
1087	>	*
1088	>	* @param m mappings to be stored in this map
1089	>	*/
1090	>	public void putAll(Map<? extends K, ? extends V> m) {
1091	>	tryPresize(m.size());
1092	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1093	>	putVal(e.getKey(), e.getValue(), false);
1094	>	}
1095
1096	<	TreeNode f = first;
1097	<	TreeNode x = first = new TreeNode(h, k, v, f, p);
1098	<	if (p == null)
1099	<	root = x;
1100	<	else { // attach and rebalance; adapted from CLR
1101	<	TreeNode xp, xpp;
1102	<	if (f != null)
1103	<	f.prev = x;
1104	<	if (dir <= 0)
1105	<	p.left = x;
1106	<	else
1107	<	p.right = x;
1108	<	x.red = true;
1109	<	while (x != null && (xp = x.parent) != null && xp.red &&
1110	<	(xpp = xp.parent) != null) {
1111	<	TreeNode xppl = xpp.left;
1112	<	if (xp == xppl) {
1113	<	TreeNode y = xpp.right;
1114	<	if (y != null && y.red) {
1115	<	y.red = false;
1116	<	xp.red = false;
1117	<	xpp.red = true;
1118	<	x = xpp;
1119	<	}
1120	<	else {
1121	<	if (x == xp.right) {
1122	<	rotateLeft(x = xp);
1123	<	xpp = (xp = x.parent) == null ? null : xp.parent;
1124	<	}
1125	<	if (xp != null) {
1126	<	xp.red = false;
1127	<	if (xpp != null) {
1128	<	xpp.red = true;
1129	<	rotateRight(xpp);
1096	>	/**
1097	>	* Removes the key (and its corresponding value) from this map.
1098	>	* This method does nothing if the key is not in the map.
1099	>	*
1100	>	* @param  key the key that needs to be removed
1101	>	* @return the previous value associated with {@code key}, or
1102	>	*         {@code null} if there was no mapping for {@code key}
1103	>	* @throws NullPointerException if the specified key is null
1104	>	*/
1105	>	public V remove(Object key) {
1106	>	return replaceNode(key, null, null);
1107	>	}
1108	>
1109	>	/**
1110	>	* Implementation for the four public remove/replace methods:
1111	>	* Replaces node value with v, conditional upon match of cv if
1112	>	* non-null.  If resulting value is null, delete.
1113	>	*/
1114	>	final V replaceNode(Object key, V value, Object cv) {
1115	>	int hash = spread(key.hashCode());
1116	>	for (Node<K,V>[] tab = table;;) {
1117	>	Node<K,V> f; int n, i, fh;
1118	>	if (tab == null || (n = tab.length) == 0 ||
1119	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1120	>	break;
1121	>	else if ((fh = f.hash) == MOVED)
1122	>	tab = helpTransfer(tab, f);
1123	>	else {
1124	>	V oldVal = null;
1125	>	boolean validated = false;
1126	>	synchronized (f) {
1127	>	if (tabAt(tab, i) == f) {
1128	>	if (fh >= 0) {
1129	>	validated = true;
1130	>	for (Node<K,V> e = f, pred = null;;) {
1131	>	K ek;
1132	>	if (e.hash == hash &&
1133	>	((ek = e.key) == key ||
1134	>	(ek != null && key.equals(ek)))) {
1135	>	V ev = e.val;
1136	>	if (cv == null || cv == ev ||
1137	>	(ev != null && cv.equals(ev))) {
1138	>	oldVal = ev;
1139	>	if (value != null)
1140	>	e.val = value;
1141	>	else if (pred != null)
1142	>	pred.next = e.next;
1143	>	else
1144	>	setTabAt(tab, i, e.next);
1145	>	}
1146	>	break;
1147		}
1148	+	pred = e;
1149	+	if ((e = e.next) == null)
1150	+	break;
1151		}
1152		}
1153	<	}
1154	<	else {
1155	<	TreeNode y = xppl;
1156	<	if (y != null && y.red) {
1157	<	y.red = false;
1158	<	xp.red = false;
1159	<	xpp.red = true;
1160	<	x = xpp;
1161	<	}
1162	<	else {
1163	<	if (x == xp.left) {
1164	<	rotateRight(x = xp);
1165	<	xpp = (xp = x.parent) == null ? null : xp.parent;
1166	<	}
964	<	if (xp != null) {
965	<	xp.red = false;
966	<	if (xpp != null) {
967	<	xpp.red = true;
968	<	rotateLeft(xpp);
1153	>	else if (f instanceof TreeBin) {
1154	>	validated = true;
1155	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1156	>	TreeNode<K,V> r, p;
1157	>	if ((r = t.root) != null &&
1158	>	(p = r.findTreeNode(hash, key, null)) != null) {
1159	>	V pv = p.val;
1160	>	if (cv == null || cv == pv ||
1161	>	(pv != null && cv.equals(pv))) {
1162	>	oldVal = pv;
1163	>	if (value != null)
1164	>	p.val = value;
1165	>	else if (t.removeTreeNode(p))
1166	>	setTabAt(tab, i, untreeify(t.first));
1167		}
1168		}
1169		}
1170		}
1171		}
1172	<	TreeNode r = root;
1173	<	if (r != null && r.red)
1174	<	r.red = false;
1175	<	}
1176	<	return null;
979	<	}
980	<
981	<	/**
982	<	* Removes the given node, that must be present before this
983	<	* call.  This is messier than typical red-black deletion code
984	<	* because we cannot swap the contents of an interior node
985	<	* with a leaf successor that is pinned by "next" pointers
986	<	* that are accessible independently of lock. So instead we
987	<	* swap the tree linkages.
988	<	*/
989	<	final void deleteTreeNode(TreeNode p) {
990	<	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
991	<	TreeNode pred = p.prev;
992	<	if (pred == null)
993	<	first = next;
994	<	else
995	<	pred.next = next;
996	<	if (next != null)
997	<	next.prev = pred;
998	<	TreeNode replacement;
999	<	TreeNode pl = p.left;
1000	<	TreeNode pr = p.right;
1001	<	if (pl != null && pr != null) {
1002	<	TreeNode s = pr, sl;
1003	<	while ((sl = s.left) != null) // find successor
1004	<	s = sl;
1005	<	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
1006	<	TreeNode sr = s.right;
1007	<	TreeNode pp = p.parent;
1008	<	if (s == pr) { // p was s's direct parent
1009	<	p.parent = s;
1010	<	s.right = p;
1011	<	}
1012	<	else {
1013	<	TreeNode sp = s.parent;
1014	<	if ((p.parent = sp) != null) {
1015	<	if (s == sp.left)
1016	<	sp.left = p;
1017	<	else
1018	<	sp.right = p;
1172	>	if (validated) {
1173	>	if (oldVal != null) {
1174	>	if (value == null)
1175	>	addCount(-1L, -1);
1176	>	return oldVal;
1177		}
1178	<	if ((s.right = pr) != null)
1021	<	pr.parent = s;
1178	>	break;
1179		}
1023	–	p.left = null;
1024	–	if ((p.right = sr) != null)
1025	–	sr.parent = p;
1026	–	if ((s.left = pl) != null)
1027	–	pl.parent = s;
1028	–	if ((s.parent = pp) == null)
1029	–	root = s;
1030	–	else if (p == pp.left)
1031	–	pp.left = s;
1032	–	else
1033	–	pp.right = s;
1034	–	replacement = sr;
1180		}
1181	<	else
1182	<	replacement = (pl != null) ? pl : pr;
1183	<	TreeNode pp = p.parent;
1184	<	if (replacement == null) {
1185	<	if (pp == null) {
1186	<	root = null;
1187	<	return;
1188	<	}
1189	<	replacement = p;
1181	>	}
1182	>	return null;
1183	>	}
1184	>
1185	>	/**
1186	>	* Removes all of the mappings from this map.
1187	>	*/
1188	>	public void clear() {
1189	>	long delta = 0L; // negative number of deletions
1190	>	int i = 0;
1191	>	Node<K,V>[] tab = table;
1192	>	while (tab != null && i < tab.length) {
1193	>	int fh;
1194	>	Node<K,V> f = tabAt(tab, i);
1195	>	if (f == null)
1196	>	++i;
1197	>	else if ((fh = f.hash) == MOVED) {
1198	>	tab = helpTransfer(tab, f);
1199	>	i = 0; // restart
1200		}
1201		else {
1202	<	replacement.parent = pp;
1203	<	if (pp == null)
1204	<	root = replacement;
1205	<	else if (p == pp.left)
1206	<	pp.left = replacement;
1207	<	else
1208	<	pp.right = replacement;
1209	<	p.left = p.right = p.parent = null;
1055	<	}
1056	<	if (!p.red) { // rebalance, from CLR
1057	<	TreeNode x = replacement;
1058	<	while (x != null) {
1059	<	TreeNode xp, xpl;
1060	<	if (x.red || (xp = x.parent) == null) {
1061	<	x.red = false;
1062	<	break;
1063	<	}
1064	<	if (x == (xpl = xp.left)) {
1065	<	TreeNode sib = xp.right;
1066	<	if (sib != null && sib.red) {
1067	<	sib.red = false;
1068	<	xp.red = true;
1069	<	rotateLeft(xp);
1070	<	sib = (xp = x.parent) == null ? null : xp.right;
1071	<	}
1072	<	if (sib == null)
1073	<	x = xp;
1074	<	else {
1075	<	TreeNode sl = sib.left, sr = sib.right;
1076	<	if ((sr == null || !sr.red) &&
1077	<	(sl == null || !sl.red)) {
1078	<	sib.red = true;
1079	<	x = xp;
1080	<	}
1081	<	else {
1082	<	if (sr == null || !sr.red) {
1083	<	if (sl != null)
1084	<	sl.red = false;
1085	<	sib.red = true;
1086	<	rotateRight(sib);
1087	<	sib = (xp = x.parent) == null ?
1088	<	null : xp.right;
1089	<	}
1090	<	if (sib != null) {
1091	<	sib.red = (xp == null) ? false : xp.red;
1092	<	if ((sr = sib.right) != null)
1093	<	sr.red = false;
1094	<	}
1095	<	if (xp != null) {
1096	<	xp.red = false;
1097	<	rotateLeft(xp);
1098	<	}
1099	<	x = root;
1100	<	}
1101	<	}
1102	<	}
1103	<	else { // symmetric
1104	<	TreeNode sib = xpl;
1105	<	if (sib != null && sib.red) {
1106	<	sib.red = false;
1107	<	xp.red = true;
1108	<	rotateRight(xp);
1109	<	sib = (xp = x.parent) == null ? null : xp.left;
1110	<	}
1111	<	if (sib == null)
1112	<	x = xp;
1113	<	else {
1114	<	TreeNode sl = sib.left, sr = sib.right;
1115	<	if ((sl == null || !sl.red) &&
1116	<	(sr == null || !sr.red)) {
1117	<	sib.red = true;
1118	<	x = xp;
1119	<	}
1120	<	else {
1121	<	if (sl == null || !sl.red) {
1122	<	if (sr != null)
1123	<	sr.red = false;
1124	<	sib.red = true;
1125	<	rotateLeft(sib);
1126	<	sib = (xp = x.parent) == null ?
1127	<	null : xp.left;
1128	<	}
1129	<	if (sib != null) {
1130	<	sib.red = (xp == null) ? false : xp.red;
1131	<	if ((sl = sib.left) != null)
1132	<	sl.red = false;
1133	<	}
1134	<	if (xp != null) {
1135	<	xp.red = false;
1136	<	rotateRight(xp);
1137	<	}
1138	<	x = root;
1139	<	}
1202	>	synchronized (f) {
1203	>	if (tabAt(tab, i) == f) {
1204	>	Node<K,V> p = (fh >= 0 ? f :
1205	>	(f instanceof TreeBin) ?
1206	>	((TreeBin<K,V>)f).first : null);
1207	>	while (p != null) {
1208	>	--delta;
1209	>	p = p.next;
1210		}
1211	+	setTabAt(tab, i++, null);
1212		}
1213		}
1214		}
1144	–	if (p == replacement && (pp = p.parent) != null) {
1145	–	if (p == pp.left) // detach pointers
1146	–	pp.left = null;
1147	–	else if (p == pp.right)
1148	–	pp.right = null;
1149	–	p.parent = null;
1150	–	}
1215		}
1216	+	if (delta != 0L)
1217	+	addCount(delta, -1);
1218		}
1219
1220	<	/* ---------------- Collision reduction methods -------------- */
1220	>	/**
1221	>	* Returns a {@link Set} view of the keys contained in this map.
1222	>	* The set is backed by the map, so changes to the map are
1223	>	* reflected in the set, and vice-versa. The set supports element
1224	>	* removal, which removes the corresponding mapping from this map,
1225	>	* via the {@code Iterator.remove}, {@code Set.remove},
1226	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1227	>	* operations.  It does not support the {@code add} or
1228	>	* {@code addAll} operations.
1229	>	*
1230	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1231	>	* that will never throw {@link ConcurrentModificationException},
1232	>	* and guarantees to traverse elements as they existed upon
1233	>	* construction of the iterator, and may (but is not guaranteed to)
1234	>	* reflect any modifications subsequent to construction.
1235	>	*
1236	>	* @return the set view
1237	>	*/
1238	>	public KeySetView<K,V> keySet() {
1239	>	KeySetView<K,V> ks;
1240	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1241	>	}
1242
1243		/**
1244	<	* Spreads higher bits to lower, and also forces top bit to 0.
1245	<	* Because the table uses power-of-two masking, sets of hashes
1246	<	* that vary only in bits above the current mask will always
1247	<	* collide. (Among known examples are sets of Float keys holding
1248	<	* consecutive whole numbers in small tables.)  To counter this,
1249	<	* we apply a transform that spreads the impact of higher bits
1250	<	* downward. There is a tradeoff between speed, utility, and
1251	<	* quality of bit-spreading. Because many common sets of hashes
1252	<	* are already reasonably distributed across bits (so don't benefit
1253	<	* from spreading), and because we use trees to handle large sets
1254	<	* of collisions in bins, we don't need excessively high quality.
1244	>	* Returns a {@link Collection} view of the values contained in this map.
1245	>	* The collection is backed by the map, so changes to the map are
1246	>	* reflected in the collection, and vice-versa.  The collection
1247	>	* supports element removal, which removes the corresponding
1248	>	* mapping from this map, via the {@code Iterator.remove},
1249	>	* {@code Collection.remove}, {@code removeAll},
1250	>	* {@code retainAll}, and {@code clear} operations.  It does not
1251	>	* support the {@code add} or {@code addAll} operations.
1252	>	*
1253	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1254	>	* that will never throw {@link ConcurrentModificationException},
1255	>	* and guarantees to traverse elements as they existed upon
1256	>	* construction of the iterator, and may (but is not guaranteed to)
1257	>	* reflect any modifications subsequent to construction.
1258	>	*
1259	>	* @return the collection view
1260	>	*/
1261	>	public Collection<V> values() {
1262	>	ValuesView<K,V> vs;
1263	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1264	>	}
1265	>
1266	>	/**
1267	>	* Returns a {@link Set} view of the mappings contained in this map.
1268	>	* The set is backed by the map, so changes to the map are
1269	>	* reflected in the set, and vice-versa.  The set supports element
1270	>	* removal, which removes the corresponding mapping from the map,
1271	>	* via the {@code Iterator.remove}, {@code Set.remove},
1272	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1273	>	* operations.
1274	>	*
1275	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1276	>	* that will never throw {@link ConcurrentModificationException},
1277	>	* and guarantees to traverse elements as they existed upon
1278	>	* construction of the iterator, and may (but is not guaranteed to)
1279	>	* reflect any modifications subsequent to construction.
1280	>	*
1281	>	* @return the set view
1282	>	*/
1283	>	public Set<Map.Entry<K,V>> entrySet() {
1284	>	EntrySetView<K,V> es;
1285	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1286	>	}
1287	>
1288	>	/**
1289	>	* Returns the hash code value for this {@link Map}, i.e.,
1290	>	* the sum of, for each key-value pair in the map,
1291	>	* {@code key.hashCode() ^ value.hashCode()}.
1292	>	*
1293	>	* @return the hash code value for this map
1294	>	*/
1295	>	public int hashCode() {
1296	>	int h = 0;
1297	>	Node<K,V>[] t;
1298	>	if ((t = table) != null) {
1299	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1300	>	for (Node<K,V> p; (p = it.advance()) != null; )
1301	>	h += p.key.hashCode() ^ p.val.hashCode();
1302	>	}
1303	>	return h;
1304	>	}
1305	>
1306	>	/**
1307	>	* Returns a string representation of this map.  The string
1308	>	* representation consists of a list of key-value mappings (in no
1309	>	* particular order) enclosed in braces ("{@code {}}").  Adjacent
1310	>	* mappings are separated by the characters {@code ", "} (comma
1311	>	* and space).  Each key-value mapping is rendered as the key
1312	>	* followed by an equals sign ("{@code =}") followed by the
1313	>	* associated value.
1314	>	*
1315	>	* @return a string representation of this map
1316		*/
1317	<	private static final int spread(int h) {
1318	<	h ^= (h >>> 18) ^ (h >>> 12);
1319	<	return (h ^ (h >>> 10)) & HASH_BITS;
1317	>	public String toString() {
1318	>	Node<K,V>[] t;
1319	>	int f = (t = table) == null ? 0 : t.length;
1320	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1321	>	StringBuilder sb = new StringBuilder();
1322	>	sb.append('{');
1323	>	Node<K,V> p;
1324	>	if ((p = it.advance()) != null) {
1325	>	for (;;) {
1326	>	K k = p.key;
1327	>	V v = p.val;
1328	>	sb.append(k == this ? "(this Map)" : k);
1329	>	sb.append('=');
1330	>	sb.append(v == this ? "(this Map)" : v);
1331	>	if ((p = it.advance()) == null)
1332	>	break;
1333	>	sb.append(',').append(' ');
1334	>	}
1335	>	}
1336	>	return sb.append('}').toString();
1337		}
1338
1339		/**
1340	<	* Replaces a list bin with a tree bin if key is comparable.  Call
1341	<	* only when locked.
1340	>	* Compares the specified object with this map for equality.
1341	>	* Returns {@code true} if the given object is a map with the same
1342	>	* mappings as this map.  This operation may return misleading
1343	>	* results if either map is concurrently modified during execution
1344	>	* of this method.
1345	>	*
1346	>	* @param o object to be compared for equality with this map
1347	>	* @return {@code true} if the specified object is equal to this map
1348		*/
1349	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
1350	<	if (key instanceof Comparable) {
1351	<	TreeBin t = new TreeBin();
1352	<	for (Node e = tabAt(tab, index); e != null; e = e.next)
1353	<	t.putTreeNode(e.hash, e.key, e.val);
1354	<	setTabAt(tab, index, new Node(MOVED, t, null, null));
1349	>	public boolean equals(Object o) {
1350	>	if (o != this) {
1351	>	if (!(o instanceof Map))
1352	>	return false;
1353	>	Map<?,?> m = (Map<?,?>) o;
1354	>	Node<K,V>[] t;
1355	>	int f = (t = table) == null ? 0 : t.length;
1356	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1357	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1358	>	V val = p.val;
1359	>	Object v = m.get(p.key);
1360	>	if (v == null || (v != val && !v.equals(val)))
1361	>	return false;
1362	>	}
1363	>	for (Map.Entry<?,?> e : m.entrySet()) {
1364	>	Object mk, mv, v;
1365	>	if ((mk = e.getKey()) == null ||
1366	>	(mv = e.getValue()) == null ||
1367	>	(v = get(mk)) == null ||
1368	>	(mv != v && !mv.equals(v)))
1369	>	return false;
1370	>	}
1371		}
1372	+	return true;
1373		}
1374
1375	<	/* ---------------- Internal access and update methods -------------- */
1375	>	/**
1376	>	* Stripped-down version of helper class used in previous version,
1377	>	* declared for the sake of serialization compatibility
1378	>	*/
1379	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1380	>	private static final long serialVersionUID = 2249069246763182397L;
1381	>	final float loadFactor;
1382	>	Segment(float lf) { this.loadFactor = lf; }
1383	>	}
1384
1385	<	/** Implementation for get and containsKey */
1386	<	@SuppressWarnings("unchecked") private final V internalGet(Object k) {
1387	<	int h = spread(k.hashCode());
1388	<	retry: for (Node[] tab = table; tab != null;) {
1389	<	Node e; Object ek, ev; int eh;      // locals to read fields once
1390	<	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1391	<	if ((eh = e.hash) < 0) {
1392	<	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1393	<	return (V)((TreeBin)ek).getValue(h, k);
1394	<	else {                        // restart with new table
1395	<	tab = (Node[])ek;
1396	<	continue retry;
1397	<	}
1398	<	}
1399	<	else if (eh == h && (ev = e.val) != null &&
1400	<	((ek = e.key) == k || k.equals(ek)))
1401	<	return (V)ev;
1385	>	/**
1386	>	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
1387	>	* stream (i.e., serializes it).
1388	>	* @param s the stream
1389	>	* @throws java.io.IOException if an I/O error occurs
1390	>	* @serialData
1391	>	* the key (Object) and value (Object)
1392	>	* for each key-value mapping, followed by a null pair.
1393	>	* The key-value mappings are emitted in no particular order.
1394	>	*/
1395	>	private void writeObject(java.io.ObjectOutputStream s)
1396	>	throws java.io.IOException {
1397	>	// For serialization compatibility
1398	>	// Emulate segment calculation from previous version of this class
1399	>	int sshift = 0;
1400	>	int ssize = 1;
1401	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1402	>	++sshift;
1403	>	ssize <<= 1;
1404	>	}
1405	>	int segmentShift = 32 - sshift;
1406	>	int segmentMask = ssize - 1;
1407	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1408	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1409	>	for (int i = 0; i < segments.length; ++i)
1410	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1411	>	s.putFields().put("segments", segments);
1412	>	s.putFields().put("segmentShift", segmentShift);
1413	>	s.putFields().put("segmentMask", segmentMask);
1414	>	s.writeFields();
1415	>
1416	>	Node<K,V>[] t;
1417	>	if ((t = table) != null) {
1418	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1419	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1420	>	s.writeObject(p.key);
1421	>	s.writeObject(p.val);
1422		}
1207	–	break;
1423		}
1424	<	return null;
1424	>	s.writeObject(null);
1425	>	s.writeObject(null);
1426	>	segments = null; // throw away
1427		}
1428
1429		/**
1430	<	* Implementation for the four public remove/replace methods:
1431	<	* Replaces node value with v, conditional upon match of cv if
1432	<	* non-null.  If resulting value is null, delete.
1430	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1431	>	* @param s the stream
1432	>	* @throws ClassNotFoundException if the class of a serialized object
1433	>	*         could not be found
1434	>	* @throws java.io.IOException if an I/O error occurs
1435		*/
1436	<	@SuppressWarnings("unchecked") private final V internalReplace
1437	<	(Object k, V v, Object cv) {
1438	<	int h = spread(k.hashCode());
1439	<	Object oldVal = null;
1440	<	for (Node[] tab = table;;) {
1441	<	Node f; int i, fh; Object fk;
1442	<	if (tab == null ||
1443	<	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1444	<	break;
1445	<	else if ((fh = f.hash) < 0) {
1446	<	if ((fk = f.key) instanceof TreeBin) {
1447	<	TreeBin t = (TreeBin)fk;
1448	<	boolean validated = false;
1449	<	boolean deleted = false;
1450	<	t.acquire(0);
1451	<	try {
1452	<	if (tabAt(tab, i) == f) {
1453	<	validated = true;
1454	<	TreeNode p = t.getTreeNode(h, k, t.root);
1236	<	if (p != null) {
1237	<	Object pv = p.val;
1238	<	if (cv == null || cv == pv || cv.equals(pv)) {
1239	<	oldVal = pv;
1240	<	if ((p.val = v) == null) {
1241	<	deleted = true;
1242	<	t.deleteTreeNode(p);
1243	<	}
1244	<	}
1245	<	}
1246	<	}
1247	<	} finally {
1248	<	t.release(0);
1249	<	}
1250	<	if (validated) {
1251	<	if (deleted)
1252	<	addCount(-1L, -1);
1253	<	break;
1254	<	}
1255	<	}
1256	<	else
1257	<	tab = (Node[])fk;
1436	>	private void readObject(java.io.ObjectInputStream s)
1437	>	throws java.io.IOException, ClassNotFoundException {
1438	>	/*
1439	>	* To improve performance in typical cases, we create nodes
1440	>	* while reading, then place in table once size is known.
1441	>	* However, we must also validate uniqueness and deal with
1442	>	* overpopulated bins while doing so, which requires
1443	>	* specialized versions of putVal mechanics.
1444	>	*/
1445	>	sizeCtl = -1; // force exclusion for table construction
1446	>	s.defaultReadObject();
1447	>	long size = 0L;
1448	>	Node<K,V> p = null;
1449	>	for (;;) {
1450	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1451	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1452	>	if (k != null && v != null) {
1453	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1454	>	++size;
1455		}
1456	<	else if (fh != h && f.next == null) // precheck
1457	<	break;                          // rules out possible existence
1456	>	else
1457	>	break;
1458	>	}
1459	>	if (size == 0L)
1460	>	sizeCtl = 0;
1461	>	else {
1462	>	int n;
1463	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1464	>	n = MAXIMUM_CAPACITY;
1465		else {
1466	<	boolean validated = false;
1467	<	boolean deleted = false;
1468	<	synchronized(f) {
1469	<	if (tabAt(tab, i) == f) {
1470	<	validated = true;
1471	<	for (Node e = f, pred = null;;) {
1472	<	Object ek, ev;
1473	<	if (e.hash == h &&
1474	<	((ev = e.val) != null) &&
1475	<	((ek = e.key) == k || k.equals(ek))) {
1476	<	if (cv == null || cv == ev || cv.equals(ev)) {
1477	<	oldVal = ev;
1478	<	if ((e.val = v) == null) {
1479	<	deleted = true;
1480	<	Node en = e.next;
1481	<	if (pred != null)
1482	<	pred.next = en;
1483	<	else
1484	<	setTabAt(tab, i, en);
1485	<	}
1486	<	}
1466	>	int sz = (int)size;
1467	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1468	>	}
1469	>	@SuppressWarnings("unchecked")
1470	>	Node<K,V>[] tab = (Node<K,V>[])new Node<?,?>[n];
1471	>	int mask = n - 1;
1472	>	long added = 0L;
1473	>	while (p != null) {
1474	>	boolean insertAtFront;
1475	>	Node<K,V> next = p.next, first;
1476	>	int h = p.hash, j = h & mask;
1477	>	if ((first = tabAt(tab, j)) == null)
1478	>	insertAtFront = true;
1479	>	else {
1480	>	K k = p.key;
1481	>	if (first.hash < 0) {
1482	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1483	>	if (t.putTreeVal(h, k, p.val) == null)
1484	>	++added;
1485	>	insertAtFront = false;
1486	>	}
1487	>	else {
1488	>	int binCount = 0;
1489	>	insertAtFront = true;
1490	>	Node<K,V> q; K qk;
1491	>	for (q = first; q != null; q = q.next) {
1492	>	if (q.hash == h &&
1493	>	((qk = q.key) == k ||
1494	>	(qk != null && k.equals(qk)))) {
1495	>	insertAtFront = false;
1496		break;
1497		}
1498	<	pred = e;
1499	<	if ((e = e.next) == null)
1500	<	break;
1498	>	++binCount;
1499	>	}
1500	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1501	>	insertAtFront = false;
1502	>	++added;
1503	>	p.next = first;
1504	>	TreeNode<K,V> hd = null, tl = null;
1505	>	for (q = p; q != null; q = q.next) {
1506	>	TreeNode<K,V> t = new TreeNode<K,V>
1507	>	(q.hash, q.key, q.val, null, null);
1508	>	if ((t.prev = tl) == null)
1509	>	hd = t;
1510	>	else
1511	>	tl.next = t;
1512	>	tl = t;
1513	>	}
1514	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1515		}
1516		}
1517		}
1518	<	if (validated) {
1519	<	if (deleted)
1520	<	addCount(-1L, -1);
1521	<	break;
1518	>	if (insertAtFront) {
1519	>	++added;
1520	>	p.next = first;
1521	>	setTabAt(tab, j, p);
1522		}
1523	+	p = next;
1524		}
1525	+	table = tab;
1526	+	sizeCtl = n - (n >>> 2);
1527	+	baseCount = added;
1528		}
1298	–	return (V)oldVal;
1529		}
1530
1531	<	/*
1532	<	* Internal versions of insertion methods
1533	<	* All have the same basic structure as the first (internalPut):
1534	<	*  1. If table uninitialized, create
1535	<	*  2. If bin empty, try to CAS new node
1536	<	*  3. If bin stale, use new table
1537	<	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1538	<	*  5. Lock and validate; if valid, scan and add or update
1309	<	*
1310	<	* The putAll method differs mainly in attempting to pre-allocate
1311	<	* enough table space, and also more lazily performs count updates
1312	<	* and checks.
1313	<	*
1314	<	* Most of the function-accepting methods can't be factored nicely
1315	<	* because they require different functional forms, so instead
1316	<	* sprawl out similar mechanics.
1531	>	// ConcurrentMap methods
1532	>
1533	>	/**
1534	>	* {@inheritDoc}
1535	>	*
1536	>	* @return the previous value associated with the specified key,
1537	>	*         or {@code null} if there was no mapping for the key
1538	>	* @throws NullPointerException if the specified key or value is null
1539		*/
1540	+	public V putIfAbsent(K key, V value) {
1541	+	return putVal(key, value, true);
1542	+	}
1543
1544	<	/** Implementation for put and putIfAbsent */
1545	<	@SuppressWarnings("unchecked") private final V internalPut
1546	<	(K k, V v, boolean onlyIfAbsent) {
1547	<	if (k == null || v == null) throw new NullPointerException();
1548	<	int h = spread(k.hashCode());
1549	<	int len = 0;
1550	<	for (Node[] tab = table;;) {
1551	<	int i, fh; Node f; Object fk, fv;
1552	<	if (tab == null)
1553	<	tab = initTable();
1554	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1555	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1556	<	break;                   // no lock when adding to empty bin
1544	>	/**
1545	>	* {@inheritDoc}
1546	>	*
1547	>	* @throws NullPointerException if the specified key is null
1548	>	*/
1549	>	public boolean remove(Object key, Object value) {
1550	>	if (key == null)
1551	>	throw new NullPointerException();
1552	>	return value != null && replaceNode(key, null, value) != null;
1553	>	}
1554	>
1555	>	/**
1556	>	* {@inheritDoc}
1557	>	*
1558	>	* @throws NullPointerException if any of the arguments are null
1559	>	*/
1560	>	public boolean replace(K key, V oldValue, V newValue) {
1561	>	if (key == null || oldValue == null || newValue == null)
1562	>	throw new NullPointerException();
1563	>	return replaceNode(key, newValue, oldValue) != null;
1564	>	}
1565	>
1566	>	/**
1567	>	* {@inheritDoc}
1568	>	*
1569	>	* @return the previous value associated with the specified key,
1570	>	*         or {@code null} if there was no mapping for the key
1571	>	* @throws NullPointerException if the specified key or value is null
1572	>	*/
1573	>	public V replace(K key, V value) {
1574	>	if (key == null || value == null)
1575	>	throw new NullPointerException();
1576	>	return replaceNode(key, value, null);
1577	>	}
1578	>
1579	>	// Overrides of JDK8+ Map extension method defaults
1580	>
1581	>	/**
1582	>	* Returns the value to which the specified key is mapped, or the
1583	>	* given default value if this map contains no mapping for the
1584	>	* key.
1585	>	*
1586	>	* @param key the key whose associated value is to be returned
1587	>	* @param defaultValue the value to return if this map contains
1588	>	* no mapping for the given key
1589	>	* @return the mapping for the key, if present; else the default value
1590	>	* @throws NullPointerException if the specified key is null
1591	>	*/
1592	>	public V getOrDefault(Object key, V defaultValue) {
1593	>	V v;
1594	>	return (v = get(key)) == null ? defaultValue : v;
1595	>	}
1596	>
1597	>	public void forEach(BiAction<? super K, ? super V> action) {
1598	>	if (action == null) throw new NullPointerException();
1599	>	Node<K,V>[] t;
1600	>	if ((t = table) != null) {
1601	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1602	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1603	>	action.apply(p.key, p.val);
1604		}
1605	<	else if ((fh = f.hash) < 0) {
1606	<	if ((fk = f.key) instanceof TreeBin) {
1607	<	TreeBin t = (TreeBin)fk;
1608	<	Object oldVal = null;
1609	<	t.acquire(0);
1610	<	try {
1611	<	if (tabAt(tab, i) == f) {
1612	<	len = 2;
1613	<	TreeNode p = t.putTreeNode(h, k, v);
1614	<	if (p != null) {
1615	<	oldVal = p.val;
1616	<	if (!onlyIfAbsent)
1617	<	p.val = v;
1618	<	}
1619	<	}
1620	<	} finally {
1349	<	t.release(0);
1350	<	}
1351	<	if (len != 0) {
1352	<	if (oldVal != null)
1353	<	return (V)oldVal;
1605	>	}
1606	>	}
1607	>
1608	>	public void replaceAll(BiFun<? super K, ? super V, ? extends V> function) {
1609	>	if (function == null) throw new NullPointerException();
1610	>	Node<K,V>[] t;
1611	>	if ((t = table) != null) {
1612	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1613	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1614	>	V oldValue = p.val;
1615	>	for (K key = p.key;;) {
1616	>	V newValue = function.apply(key, oldValue);
1617	>	if (newValue == null)
1618	>	throw new NullPointerException();
1619	>	if (replaceNode(key, newValue, oldValue) != null ||
1620	>	(oldValue = get(key)) == null)
1621		break;
1355	–	}
1356	–	}
1357	–	else
1358	–	tab = (Node[])fk;
1359	–	}
1360	–	else if (onlyIfAbsent && fh == h && (fv = f.val) != null &&
1361	–	((fk = f.key) == k || k.equals(fk))) // peek while nearby
1362	–	return (V)fv;
1363	–	else {
1364	–	Object oldVal = null;
1365	–	synchronized(f) {
1366	–	if (tabAt(tab, i) == f) {
1367	–	len = 1;
1368	–	for (Node e = f;; ++len) {
1369	–	Object ek, ev;
1370	–	if (e.hash == h &&
1371	–	(ev = e.val) != null &&
1372	–	((ek = e.key) == k || k.equals(ek))) {
1373	–	oldVal = ev;
1374	–	if (!onlyIfAbsent)
1375	–	e.val = v;
1376	–	break;
1377	–	}
1378	–	Node last = e;
1379	–	if ((e = e.next) == null) {
1380	–	last.next = new Node(h, k, v, null);
1381	–	if (len >= TREE_THRESHOLD)
1382	–	replaceWithTreeBin(tab, i, k);
1383	–	break;
1384	–	}
1385	–	}
1386	–	}
1387	–	}
1388	–	if (len != 0) {
1389	–	if (oldVal != null)
1390	–	return (V)oldVal;
1391	–	break;
1622		}
1623		}
1624		}
1395	–	addCount(1L, len);
1396	–	return null;
1625		}
1626
1627	<	/** Implementation for computeIfAbsent */
1628	<	@SuppressWarnings("unchecked") private final V internalComputeIfAbsent
1629	<	(K k, Fun<? super K, ?> mf) {
1630	<	if (k == null || mf == null)
1627	>	/**
1628	>	* If the specified key is not already associated with a value,
1629	>	* attempts to compute its value using the given mapping function
1630	>	* and enters it into this map unless {@code null}.  The entire
1631	>	* method invocation is performed atomically, so the function is
1632	>	* applied at most once per key.  Some attempted update operations
1633	>	* on this map by other threads may be blocked while computation
1634	>	* is in progress, so the computation should be short and simple,
1635	>	* and must not attempt to update any other mappings of this map.
1636	>	*
1637	>	* @param key key with which the specified value is to be associated
1638	>	* @param mappingFunction the function to compute a value
1639	>	* @return the current (existing or computed) value associated with
1640	>	*         the specified key, or null if the computed value is null
1641	>	* @throws NullPointerException if the specified key or mappingFunction
1642	>	*         is null
1643	>	* @throws IllegalStateException if the computation detectably
1644	>	*         attempts a recursive update to this map that would
1645	>	*         otherwise never complete
1646	>	* @throws RuntimeException or Error if the mappingFunction does so,
1647	>	*         in which case the mapping is left unestablished
1648	>	*/
1649	>	public V computeIfAbsent(K key, Fun<? super K, ? extends V> mappingFunction) {
1650	>	if (key == null || mappingFunction == null)
1651		throw new NullPointerException();
1652	<	int h = spread(k.hashCode());
1653	<	Object val = null;
1654	<	int len = 0;
1655	<	for (Node[] tab = table;;) {
1656	<	Node f; int i; Object fk;
1657	<	if (tab == null)
1652	>	int h = spread(key.hashCode());
1653	>	V val = null;
1654	>	int binCount = 0;
1655	>	for (Node<K,V>[] tab = table;;) {
1656	>	Node<K,V> f; int n, i, fh;
1657	>	if (tab == null || (n = tab.length) == 0)
1658		tab = initTable();
1659	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1660	<	Node node = new Node(h, k, null, null);
1661	<	synchronized(node) {
1662	<	if (casTabAt(tab, i, null, node)) {
1663	<	len = 1;
1659	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1660	>	Node<K,V> r = new ReservationNode<K,V>();
1661	>	synchronized (r) {
1662	>	if (casTabAt(tab, i, null, r)) {
1663	>	binCount = 1;
1664	>	Node<K,V> node = null;
1665		try {
1666	<	if ((val = mf.apply(k)) != null)
1667	<	node.val = val;
1666	>	if ((val = mappingFunction.apply(key)) != null)
1667	>	node = new Node<K,V>(h, key, val, null);
1668		} finally {
1669	<	if (val == null)
1421	<	setTabAt(tab, i, null);
1669	>	setTabAt(tab, i, node);
1670		}
1671		}
1672		}
1673	<	if (len != 0)
1673	>	if (binCount != 0)
1674		break;
1675		}
1676	<	else if (f.hash < 0) {
1677	<	if ((fk = f.key) instanceof TreeBin) {
1678	<	TreeBin t = (TreeBin)fk;
1679	<	boolean added = false;
1680	<	t.acquire(0);
1681	<	try {
1682	<	if (tabAt(tab, i) == f) {
1683	<	len = 1;
1684	<	TreeNode p = t.getTreeNode(h, k, t.root);
1685	<	if (p != null)
1676	>	else if ((fh = f.hash) == MOVED)
1677	>	tab = helpTransfer(tab, f);
1678	>	else {
1679	>	boolean added = false;
1680	>	synchronized (f) {
1681	>	if (tabAt(tab, i) == f) {
1682	>	if (fh >= 0) {
1683	>	binCount = 1;
1684	>	for (Node<K,V> e = f;; ++binCount) {
1685	>	K ek; V ev;
1686	>	if (e.hash == h &&
1687	>	((ek = e.key) == key ||
1688	>	(ek != null && key.equals(ek)))) {
1689	>	val = e.val;
1690	>	break;
1691	>	}
1692	>	Node<K,V> pred = e;
1693	>	if ((e = e.next) == null) {
1694	>	if ((val = mappingFunction.apply(key)) != null) {
1695	>	added = true;
1696	>	pred.next = new Node<K,V>(h, key, val, null);
1697	>	}
1698	>	break;
1699	>	}
1700	>	}
1701	>	}
1702	>	else if (f instanceof TreeBin) {
1703	>	binCount = 2;
1704	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1705	>	TreeNode<K,V> r, p;
1706	>	if ((r = t.root) != null &&
1707	>	(p = r.findTreeNode(h, key, null)) != null)
1708		val = p.val;
1709	<	else if ((val = mf.apply(k)) != null) {
1709	>	else if ((val = mappingFunction.apply(key)) != null) {
1710		added = true;
1711	<	len = 2;
1442	<	t.putTreeNode(h, k, val);
1711	>	t.putTreeVal(h, key, val);
1712		}
1713		}
1445	–	} finally {
1446	–	t.release(0);
1447	–	}
1448	–	if (len != 0) {
1449	–	if (!added)
1450	–	return (V)val;
1451	–	break;
1714		}
1715		}
1716	<	else
1717	<	tab = (Node[])fk;
1716	>	if (binCount != 0) {
1717	>	if (binCount >= TREEIFY_THRESHOLD)
1718	>	treeifyBin(tab, i);
1719	>	if (!added)
1720	>	return val;
1721	>	break;
1722	>	}
1723		}
1724	+	}
1725	+	if (val != null)
1726	+	addCount(1L, binCount);
1727	+	return val;
1728	+	}
1729	+
1730	+	/**
1731	+	* If the value for the specified key is present, attempts to
1732	+	* compute a new mapping given the key and its current mapped
1733	+	* value.  The entire method invocation is performed atomically.
1734	+	* Some attempted update operations on this map by other threads
1735	+	* may be blocked while computation is in progress, so the
1736	+	* computation should be short and simple, and must not attempt to
1737	+	* update any other mappings of this map.
1738	+	*
1739	+	* @param key key with which a value may be associated
1740	+	* @param remappingFunction the function to compute a value
1741	+	* @return the new value associated with the specified key, or null if none
1742	+	* @throws NullPointerException if the specified key or remappingFunction
1743	+	*         is null
1744	+	* @throws IllegalStateException if the computation detectably
1745	+	*         attempts a recursive update to this map that would
1746	+	*         otherwise never complete
1747	+	* @throws RuntimeException or Error if the remappingFunction does so,
1748	+	*         in which case the mapping is unchanged
1749	+	*/
1750	+	public V computeIfPresent(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1751	+	if (key == null || remappingFunction == null)
1752	+	throw new NullPointerException();
1753	+	int h = spread(key.hashCode());
1754	+	V val = null;
1755	+	int delta = 0;
1756	+	int binCount = 0;
1757	+	for (Node<K,V>[] tab = table;;) {
1758	+	Node<K,V> f; int n, i, fh;
1759	+	if (tab == null || (n = tab.length) == 0)
1760	+	tab = initTable();
1761	+	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1762	+	break;
1763	+	else if ((fh = f.hash) == MOVED)
1764	+	tab = helpTransfer(tab, f);
1765		else {
1766	<	for (Node e = f; e != null; e = e.next) { // prescan
1459	<	Object ek, ev;
1460	<	if (e.hash == h && (ev = e.val) != null &&
1461	<	((ek = e.key) == k || k.equals(ek)))
1462	<	return (V)ev;
1463	<	}
1464	<	boolean added = false;
1465	<	synchronized(f) {
1766	>	synchronized (f) {
1767		if (tabAt(tab, i) == f) {
1768	<	len = 1;
1769	<	for (Node e = f;; ++len) {
1770	<	Object ek, ev;
1771	<	if (e.hash == h &&
1772	<	(ev = e.val) != null &&
1773	<	((ek = e.key) == k || k.equals(ek))) {
1774	<	val = ev;
1775	<	break;
1768	>	if (fh >= 0) {
1769	>	binCount = 1;
1770	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1771	>	K ek;
1772	>	if (e.hash == h &&
1773	>	((ek = e.key) == key ||
1774	>	(ek != null && key.equals(ek)))) {
1775	>	val = remappingFunction.apply(key, e.val);
1776	>	if (val != null)
1777	>	e.val = val;
1778	>	else {
1779	>	delta = -1;
1780	>	Node<K,V> en = e.next;
1781	>	if (pred != null)
1782	>	pred.next = en;
1783	>	else
1784	>	setTabAt(tab, i, en);
1785	>	}
1786	>	break;
1787	>	}
1788	>	pred = e;
1789	>	if ((e = e.next) == null)
1790	>	break;
1791		}
1792	<	Node last = e;
1793	<	if ((e = e.next) == null) {
1794	<	if ((val = mf.apply(k)) != null) {
1795	<	added = true;
1796	<	last.next = new Node(h, k, val, null);
1797	<	if (len >= TREE_THRESHOLD)
1798	<	replaceWithTreeBin(tab, i, k);
1792	>	}
1793	>	else if (f instanceof TreeBin) {
1794	>	binCount = 2;
1795	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1796	>	TreeNode<K,V> r, p;
1797	>	if ((r = t.root) != null &&
1798	>	(p = r.findTreeNode(h, key, null)) != null) {
1799	>	val = remappingFunction.apply(key, p.val);
1800	>	if (val != null)
1801	>	p.val = val;
1802	>	else {
1803	>	delta = -1;
1804	>	if (t.removeTreeNode(p))
1805	>	setTabAt(tab, i, untreeify(t.first));
1806		}
1484	–	break;
1807		}
1808		}
1809		}
1810		}
1811	<	if (len != 0) {
1490	<	if (!added)
1491	<	return (V)val;
1811	>	if (binCount != 0)
1812		break;
1493	–	}
1813		}
1814		}
1815	<	if (val != null)
1816	<	addCount(1L, len);
1817	<	return (V)val;
1815	>	if (delta != 0)
1816	>	addCount((long)delta, binCount);
1817	>	return val;
1818		}
1819
1820	<	/** Implementation for compute */
1821	<	@SuppressWarnings("unchecked") private final V internalCompute
1822	<	(K k, boolean onlyIfPresent,
1823	<	BiFun<? super K, ? super V, ? extends V> mf) {
1824	<	if (k == null || mf == null)
1820	>	/**
1821	>	* Attempts to compute a mapping for the specified key and its
1822	>	* current mapped value (or {@code null} if there is no current
1823	>	* mapping). The entire method invocation is performed atomically.
1824	>	* Some attempted update operations on this map by other threads
1825	>	* may be blocked while computation is in progress, so the
1826	>	* computation should be short and simple, and must not attempt to
1827	>	* update any other mappings of this Map.
1828	>	*
1829	>	* @param key key with which the specified value is to be associated
1830	>	* @param remappingFunction the function to compute a value
1831	>	* @return the new value associated with the specified key, or null if none
1832	>	* @throws NullPointerException if the specified key or remappingFunction
1833	>	*         is null
1834	>	* @throws IllegalStateException if the computation detectably
1835	>	*         attempts a recursive update to this map that would
1836	>	*         otherwise never complete
1837	>	* @throws RuntimeException or Error if the remappingFunction does so,
1838	>	*         in which case the mapping is unchanged
1839	>	*/
1840	>	public V compute(K key,
1841	>	BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1842	>	if (key == null || remappingFunction == null)
1843		throw new NullPointerException();
1844	<	int h = spread(k.hashCode());
1845	<	Object val = null;
1844	>	int h = spread(key.hashCode());
1845	>	V val = null;
1846		int delta = 0;
1847	<	int len = 0;
1848	<	for (Node[] tab = table;;) {
1849	<	Node f; int i, fh; Object fk;
1850	<	if (tab == null)
1847	>	int binCount = 0;
1848	>	for (Node<K,V>[] tab = table;;) {
1849	>	Node<K,V> f; int n, i, fh;
1850	>	if (tab == null || (n = tab.length) == 0)
1851		tab = initTable();
1852	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1853	<	if (onlyIfPresent)
1854	<	break;
1855	<	Node node = new Node(h, k, null, null);
1856	<	synchronized(node) {
1857	<	if (casTabAt(tab, i, null, node)) {
1852	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1853	>	Node<K,V> r = new ReservationNode<K,V>();
1854	>	synchronized (r) {
1855	>	if (casTabAt(tab, i, null, r)) {
1856	>	binCount = 1;
1857	>	Node<K,V> node = null;
1858		try {
1859	<	len = 1;
1523	<	if ((val = mf.apply(k, null)) != null) {
1524	<	node.val = val;
1859	>	if ((val = remappingFunction.apply(key, null)) != null) {
1860		delta = 1;
1861	+	node = new Node<K,V>(h, key, val, null);
1862		}
1863		} finally {
1864	<	if (delta == 0)
1529	<	setTabAt(tab, i, null);
1864	>	setTabAt(tab, i, node);
1865		}
1866		}
1867		}
1868	<	if (len != 0)
1868	>	if (binCount != 0)
1869		break;
1870		}
1871	<	else if ((fh = f.hash) < 0) {
1872	<	if ((fk = f.key) instanceof TreeBin) {
1873	<	TreeBin t = (TreeBin)fk;
1874	<	t.acquire(0);
1875	<	try {
1876	<	if (tabAt(tab, i) == f) {
1877	<	len = 1;
1878	<	TreeNode p = t.getTreeNode(h, k, t.root);
1879	<	if (p == null && onlyIfPresent)
1880	<	break;
1881	<	Object pv = (p == null) ? null : p.val;
1882	<	if ((val = mf.apply(k, (V)pv)) != null) {
1871	>	else if ((fh = f.hash) == MOVED)
1872	>	tab = helpTransfer(tab, f);
1873	>	else {
1874	>	synchronized (f) {
1875	>	if (tabAt(tab, i) == f) {
1876	>	if (fh >= 0) {
1877	>	binCount = 1;
1878	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1879	>	K ek;
1880	>	if (e.hash == h &&
1881	>	((ek = e.key) == key ||
1882	>	(ek != null && key.equals(ek)))) {
1883	>	val = remappingFunction.apply(key, e.val);
1884	>	if (val != null)
1885	>	e.val = val;
1886	>	else {
1887	>	delta = -1;
1888	>	Node<K,V> en = e.next;
1889	>	if (pred != null)
1890	>	pred.next = en;
1891	>	else
1892	>	setTabAt(tab, i, en);
1893	>	}
1894	>	break;
1895	>	}
1896	>	pred = e;
1897	>	if ((e = e.next) == null) {
1898	>	val = remappingFunction.apply(key, null);
1899	>	if (val != null) {
1900	>	delta = 1;
1901	>	pred.next =
1902	>	new Node<K,V>(h, key, val, null);
1903	>	}
1904	>	break;
1905	>	}
1906	>	}
1907	>	}
1908	>	else if (f instanceof TreeBin) {
1909	>	binCount = 1;
1910	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1911	>	TreeNode<K,V> r, p;
1912	>	if ((r = t.root) != null)
1913	>	p = r.findTreeNode(h, key, null);
1914	>	else
1915	>	p = null;
1916	>	V pv = (p == null) ? null : p.val;
1917	>	val = remappingFunction.apply(key, pv);
1918	>	if (val != null) {
1919		if (p != null)
1920		p.val = val;
1921		else {
1551	–	len = 2;
1922		delta = 1;
1923	<	t.putTreeNode(h, k, val);
1923	>	t.putTreeVal(h, key, val);
1924		}
1925		}
1926		else if (p != null) {
1927		delta = -1;
1928	<	t.deleteTreeNode(p);
1928	>	if (t.removeTreeNode(p))
1929	>	setTabAt(tab, i, untreeify(t.first));
1930		}
1931		}
1561	–	} finally {
1562	–	t.release(0);
1932		}
1564	–	if (len != 0)
1565	–	break;
1933		}
1934	<	else
1935	<	tab = (Node[])fk;
1936	<	}
1570	<	else {
1571	<	synchronized(f) {
1572	<	if (tabAt(tab, i) == f) {
1573	<	len = 1;
1574	<	for (Node e = f, pred = null;; ++len) {
1575	<	Object ek, ev;
1576	<	if (e.hash == h &&
1577	<	(ev = e.val) != null &&
1578	<	((ek = e.key) == k || k.equals(ek))) {
1579	<	val = mf.apply(k, (V)ev);
1580	<	if (val != null)
1581	<	e.val = val;
1582	<	else {
1583	<	delta = -1;
1584	<	Node en = e.next;
1585	<	if (pred != null)
1586	<	pred.next = en;
1587	<	else
1588	<	setTabAt(tab, i, en);
1589	<	}
1590	<	break;
1591	<	}
1592	<	pred = e;
1593	<	if ((e = e.next) == null) {
1594	<	if (!onlyIfPresent &&
1595	<	(val = mf.apply(k, null)) != null) {
1596	<	pred.next = new Node(h, k, val, null);
1597	<	delta = 1;
1598	<	if (len >= TREE_THRESHOLD)
1599	<	replaceWithTreeBin(tab, i, k);
1600	<	}
1601	<	break;
1602	<	}
1603	<	}
1604	<	}
1605	<	}
1606	<	if (len != 0)
1934	>	if (binCount != 0) {
1935	>	if (binCount >= TREEIFY_THRESHOLD)
1936	>	treeifyBin(tab, i);
1937		break;
1938	+	}
1939		}
1940		}
1941		if (delta != 0)
1942	<	addCount((long)delta, len);
1943	<	return (V)val;
1942	>	addCount((long)delta, binCount);
1943	>	return val;
1944		}
1945
1946	<	/** Implementation for merge */
1947	<	@SuppressWarnings("unchecked") private final V internalMerge
1948	<	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
1949	<	if (k == null || v == null || mf == null)
1946	>	/**
1947	>	* If the specified key is not already associated with a
1948	>	* (non-null) value, associates it with the given value.
1949	>	* Otherwise, replaces the value with the results of the given
1950	>	* remapping function, or removes if {@code null}. The entire
1951	>	* method invocation is performed atomically.  Some attempted
1952	>	* update operations on this map by other threads may be blocked
1953	>	* while computation is in progress, so the computation should be
1954	>	* short and simple, and must not attempt to update any other
1955	>	* mappings of this Map.
1956	>	*
1957	>	* @param key key with which the specified value is to be associated
1958	>	* @param value the value to use if absent
1959	>	* @param remappingFunction the function to recompute a value if present
1960	>	* @return the new value associated with the specified key, or null if none
1961	>	* @throws NullPointerException if the specified key or the
1962	>	*         remappingFunction is null
1963	>	* @throws RuntimeException or Error if the remappingFunction does so,
1964	>	*         in which case the mapping is unchanged
1965	>	*/
1966	>	public V merge(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1967	>	if (key == null || value == null || remappingFunction == null)
1968		throw new NullPointerException();
1969	<	int h = spread(k.hashCode());
1970	<	Object val = null;
1969	>	int h = spread(key.hashCode());
1970	>	V val = null;
1971		int delta = 0;
1972	<	int len = 0;
1973	<	for (Node[] tab = table;;) {
1974	<	int i; Node f; Object fk, fv;
1975	<	if (tab == null)
1972	>	int binCount = 0;
1973	>	for (Node<K,V>[] tab = table;;) {
1974	>	Node<K,V> f; int n, i, fh;
1975	>	if (tab == null || (n = tab.length) == 0)
1976		tab = initTable();
1977	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1978	<	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1977	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1978	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1979		delta = 1;
1980	<	val = v;
1980	>	val = value;
1981		break;
1982		}
1983		}
1984	<	else if (f.hash < 0) {
1985	<	if ((fk = f.key) instanceof TreeBin) {
1986	<	TreeBin t = (TreeBin)fk;
1987	<	t.acquire(0);
1988	<	try {
1989	<	if (tabAt(tab, i) == f) {
1990	<	len = 1;
1991	<	TreeNode p = t.getTreeNode(h, k, t.root);
1992	<	val = (p == null) ? v : mf.apply((V)p.val, v);
1984	>	else if ((fh = f.hash) == MOVED)
1985	>	tab = helpTransfer(tab, f);
1986	>	else {
1987	>	synchronized (f) {
1988	>	if (tabAt(tab, i) == f) {
1989	>	if (fh >= 0) {
1990	>	binCount = 1;
1991	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1992	>	K ek;
1993	>	if (e.hash == h &&
1994	>	((ek = e.key) == key ||
1995	>	(ek != null && key.equals(ek)))) {
1996	>	val = remappingFunction.apply(e.val, value);
1997	>	if (val != null)
1998	>	e.val = val;
1999	>	else {
2000	>	delta = -1;
2001	>	Node<K,V> en = e.next;
2002	>	if (pred != null)
2003	>	pred.next = en;
2004	>	else
2005	>	setTabAt(tab, i, en);
2006	>	}
2007	>	break;
2008	>	}
2009	>	pred = e;
2010	>	if ((e = e.next) == null) {
2011	>	delta = 1;
2012	>	val = value;
2013	>	pred.next =
2014	>	new Node<K,V>(h, key, val, null);
2015	>	break;
2016	>	}
2017	>	}
2018	>	}
2019	>	else if (f instanceof TreeBin) {
2020	>	binCount = 2;
2021	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2022	>	TreeNode<K,V> r = t.root;
2023	>	TreeNode<K,V> p = (r == null) ? null :
2024	>	r.findTreeNode(h, key, null);
2025	>	val = (p == null) ? value :
2026	>	remappingFunction.apply(p.val, value);
2027		if (val != null) {
2028		if (p != null)
2029		p.val = val;
2030		else {
1648	–	len = 2;
2031		delta = 1;
2032	<	t.putTreeNode(h, k, val);
2032	>	t.putTreeVal(h, key, val);
2033		}
2034		}
2035		else if (p != null) {
2036		delta = -1;
2037	<	t.deleteTreeNode(p);
2038	<	}
1657	<	}
1658	<	} finally {
1659	<	t.release(0);
1660	<	}
1661	<	if (len != 0)
1662	<	break;
1663	<	}
1664	<	else
1665	<	tab = (Node[])fk;
1666	<	}
1667	<	else {
1668	<	synchronized(f) {
1669	<	if (tabAt(tab, i) == f) {
1670	<	len = 1;
1671	<	for (Node e = f, pred = null;; ++len) {
1672	<	Object ek, ev;
1673	<	if (e.hash == h &&
1674	<	(ev = e.val) != null &&
1675	<	((ek = e.key) == k || k.equals(ek))) {
1676	<	val = mf.apply((V)ev, v);
1677	<	if (val != null)
1678	<	e.val = val;
1679	<	else {
1680	<	delta = -1;
1681	<	Node en = e.next;
1682	<	if (pred != null)
1683	<	pred.next = en;
1684	<	else
1685	<	setTabAt(tab, i, en);
1686	<	}
1687	<	break;
1688	<	}
1689	<	pred = e;
1690	<	if ((e = e.next) == null) {
1691	<	val = v;
1692	<	pred.next = new Node(h, k, val, null);
1693	<	delta = 1;
1694	<	if (len >= TREE_THRESHOLD)
1695	<	replaceWithTreeBin(tab, i, k);
1696	<	break;
2037	>	if (t.removeTreeNode(p))
2038	>	setTabAt(tab, i, untreeify(t.first));
2039		}
2040		}
2041		}
2042		}
2043	<	if (len != 0)
2043	>	if (binCount != 0) {
2044	>	if (binCount >= TREEIFY_THRESHOLD)
2045	>	treeifyBin(tab, i);
2046		break;
2047	+	}
2048		}
2049		}
2050		if (delta != 0)
2051	<	addCount((long)delta, len);
2052	<	return (V)val;
2051	>	addCount((long)delta, binCount);
2052	>	return val;
2053		}
2054
2055	<	/** Implementation for putAll */
2056	<	private final void internalPutAll(Map<?, ?> m) {
2057	<	tryPresize(m.size());
2058	<	long delta = 0L;     // number of uncommitted additions
2059	<	boolean npe = false; // to throw exception on exit for nulls
2060	<	try {                // to clean up counts on other exceptions
2061	<	for (Map.Entry<?, ?> entry : m.entrySet()) {
2062	<	Object k, v;
2063	<	if (entry == null || (k = entry.getKey()) == null ||
2064	<	(v = entry.getValue()) == null) {
2065	<	npe = true;
2066	<	break;
2067	<	}
2068	<	int h = spread(k.hashCode());
2069	<	for (Node[] tab = table;;) {
2070	<	int i; Node f; int fh; Object fk;
2071	<	if (tab == null)
2072	<	tab = initTable();
2073	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
2074	<	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
2075	<	++delta;
2076	<	break;
2077	<	}
2078	<	}
2079	<	else if ((fh = f.hash) < 0) {
2080	<	if ((fk = f.key) instanceof TreeBin) {
2081	<	TreeBin t = (TreeBin)fk;
2082	<	boolean validated = false;
2083	<	t.acquire(0);
2084	<	try {
2085	<	if (tabAt(tab, i) == f) {
2086	<	validated = true;
2087	<	TreeNode p = t.getTreeNode(h, k, t.root);
2088	<	if (p != null)
2089	<	p.val = v;
2090	<	else {
2091	<	t.putTreeNode(h, k, v);
2092	<	++delta;
2093	<	}
2094	<	}
2095	<	} finally {
2096	<	t.release(0);
2097	<	}
2098	<	if (validated)
2099	<	break;
2055	>	// Hashtable legacy methods
2056	>
2057	>	/**
2058	>	* Legacy method testing if some key maps into the specified value
2059	>	* in this table.  This method is identical in functionality to
2060	>	* {@link #containsValue(Object)}, and exists solely to ensure
2061	>	* full compatibility with class {@link java.util.Hashtable},
2062	>	* which supported this method prior to introduction of the
2063	>	* Java Collections framework.
2064	>	*
2065	>	* @param  value a value to search for
2066	>	* @return {@code true} if and only if some key maps to the
2067	>	*         {@code value} argument in this table as
2068	>	*         determined by the {@code equals} method;
2069	>	*         {@code false} otherwise
2070	>	* @throws NullPointerException if the specified value is null
2071	>	*/
2072	>	@Deprecated public boolean contains(Object value) {
2073	>	return containsValue(value);
2074	>	}
2075	>
2076	>	/**
2077	>	* Returns an enumeration of the keys in this table.
2078	>	*
2079	>	* @return an enumeration of the keys in this table
2080	>	* @see #keySet()
2081	>	*/
2082	>	public Enumeration<K> keys() {
2083	>	Node<K,V>[] t;
2084	>	int f = (t = table) == null ? 0 : t.length;
2085	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2086	>	}
2087	>
2088	>	/**
2089	>	* Returns an enumeration of the values in this table.
2090	>	*
2091	>	* @return an enumeration of the values in this table
2092	>	* @see #values()
2093	>	*/
2094	>	public Enumeration<V> elements() {
2095	>	Node<K,V>[] t;
2096	>	int f = (t = table) == null ? 0 : t.length;
2097	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2098	>	}
2099	>
2100	>	// ConcurrentHashMapV8-only methods
2101	>
2102	>	/**
2103	>	* Returns the number of mappings. This method should be used
2104	>	* instead of {@link #size} because a ConcurrentHashMapV8 may
2105	>	* contain more mappings than can be represented as an int. The
2106	>	* value returned is an estimate; the actual count may differ if
2107	>	* there are concurrent insertions or removals.
2108	>	*
2109	>	* @return the number of mappings
2110	>	* @since 1.8
2111	>	*/
2112	>	public long mappingCount() {
2113	>	long n = sumCount();
2114	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2115	>	}
2116	>
2117	>	/**
2118	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2119	>	* from the given type to {@code Boolean.TRUE}.
2120	>	*
2121	>	* @return the new set
2122	>	* @since 1.8
2123	>	*/
2124	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2125	>	return new KeySetView<K,Boolean>
2126	>	(new ConcurrentHashMapV8<K,Boolean>(), Boolean.TRUE);
2127	>	}
2128	>
2129	>	/**
2130	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2131	>	* from the given type to {@code Boolean.TRUE}.
2132	>	*
2133	>	* @param initialCapacity The implementation performs internal
2134	>	* sizing to accommodate this many elements.
2135	>	* @return the new set
2136	>	* @throws IllegalArgumentException if the initial capacity of
2137	>	* elements is negative
2138	>	* @since 1.8
2139	>	*/
2140	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2141	>	return new KeySetView<K,Boolean>
2142	>	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2143	>	}
2144	>
2145	>	/**
2146	>	* Returns a {@link Set} view of the keys in this map, using the
2147	>	* given common mapped value for any additions (i.e., {@link
2148	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2149	>	* This is of course only appropriate if it is acceptable to use
2150	>	* the same value for all additions from this view.
2151	>	*
2152	>	* @param mappedValue the mapped value to use for any additions
2153	>	* @return the set view
2154	>	* @throws NullPointerException if the mappedValue is null
2155	>	*/
2156	>	public KeySetView<K,V> keySet(V mappedValue) {
2157	>	if (mappedValue == null)
2158	>	throw new NullPointerException();
2159	>	return new KeySetView<K,V>(this, mappedValue);
2160	>	}
2161	>
2162	>	/* ---------------- Special Nodes -------------- */
2163	>
2164	>	/**
2165	>	* A node inserted at head of bins during transfer operations.
2166	>	*/
2167	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2168	>	final Node<K,V>[] nextTable;
2169	>	ForwardingNode(Node<K,V>[] tab) {
2170	>	super(MOVED, null, null, null);
2171	>	this.nextTable = tab;
2172	>	}
2173	>
2174	>	Node<K,V> find(int h, Object k) {
2175	>	// loop to avoid arbitrarily deep recursion on forwarding nodes
2176	>	outer: for (Node<K,V>[] tab = nextTable;;) {
2177	>	Node<K,V> e; int n;
2178	>	if (k == null || tab == null || (n = tab.length) == 0 ||
2179	>	(e = tabAt(tab, (n - 1) & h)) == null)
2180	>	return null;
2181	>	for (;;) {
2182	>	int eh; K ek;
2183	>	if ((eh = e.hash) == h &&
2184	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2185	>	return e;
2186	>	if (eh < 0) {
2187	>	if (e instanceof ForwardingNode) {
2188	>	tab = ((ForwardingNode<K,V>)e).nextTable;
2189	>	continue outer;
2190		}
2191		else
2192	<	tab = (Node[])fk;
1758	<	}
1759	<	else {
1760	<	int len = 0;
1761	<	synchronized(f) {
1762	<	if (tabAt(tab, i) == f) {
1763	<	len = 1;
1764	<	for (Node e = f;; ++len) {
1765	<	Object ek, ev;
1766	<	if (e.hash == h &&
1767	<	(ev = e.val) != null &&
1768	<	((ek = e.key) == k || k.equals(ek))) {
1769	<	e.val = v;
1770	<	break;
1771	<	}
1772	<	Node last = e;
1773	<	if ((e = e.next) == null) {
1774	<	++delta;
1775	<	last.next = new Node(h, k, v, null);
1776	<	if (len >= TREE_THRESHOLD)
1777	<	replaceWithTreeBin(tab, i, k);
1778	<	break;
1779	<	}
1780	<	}
1781	<	}
1782	<	}
1783	<	if (len != 0) {
1784	<	if (len > 1)
1785	<	addCount(delta, len);
1786	<	break;
1787	<	}
2192	>	return e.find(h, k);
2193		}
2194	+	if ((e = e.next) == null)
2195	+	return null;
2196		}
2197		}
1791	–	} finally {
1792	–	if (delta != 0L)
1793	–	addCount(delta, 2);
2198		}
1795	–	if (npe)
1796	–	throw new NullPointerException();
2199		}
2200
2201		/**
2202	<	* Implementation for clear. Steps through each bin, removing all
1801	<	* nodes.
2202	>	* A place-holder node used in computeIfAbsent and compute
2203		*/
2204	<	private final void internalClear() {
2205	<	long delta = 0L; // negative number of deletions
2206	<	int i = 0;
2207	<	Node[] tab = table;
2208	<	while (tab != null && i < tab.length) {
2209	<	Node f = tabAt(tab, i);
2210	<	if (f == null)
1810	<	++i;
1811	<	else if (f.hash < 0) {
1812	<	Object fk;
1813	<	if ((fk = f.key) instanceof TreeBin) {
1814	<	TreeBin t = (TreeBin)fk;
1815	<	t.acquire(0);
1816	<	try {
1817	<	if (tabAt(tab, i) == f) {
1818	<	for (Node p = t.first; p != null; p = p.next) {
1819	<	if (p.val != null) { // (currently always true)
1820	<	p.val = null;
1821	<	--delta;
1822	<	}
1823	<	}
1824	<	t.first = null;
1825	<	t.root = null;
1826	<	++i;
1827	<	}
1828	<	} finally {
1829	<	t.release(0);
1830	<	}
1831	<	}
1832	<	else
1833	<	tab = (Node[])fk;
1834	<	}
1835	<	else {
1836	<	synchronized(f) {
1837	<	if (tabAt(tab, i) == f) {
1838	<	for (Node e = f; e != null; e = e.next) {
1839	<	if (e.val != null) {  // (currently always true)
1840	<	e.val = null;
1841	<	--delta;
1842	<	}
1843	<	}
1844	<	setTabAt(tab, i, null);
1845	<	++i;
1846	<	}
1847	<	}
1848	<	}
2204	>	static final class ReservationNode<K,V> extends Node<K,V> {
2205	>	ReservationNode() {
2206	>	super(RESERVED, null, null, null);
2207	>	}
2208	>
2209	>	Node<K,V> find(int h, Object k) {
2210	>	return null;
2211		}
1850	–	if (delta != 0L)
1851	–	addCount(delta, -1);
2212		}
2213
2214		/* ---------------- Table Initialization and Resizing -------------- */
2215
2216		/**
2217	<	* Returns a power of two table size for the given desired capacity.
2218	<	* See Hackers Delight, sec 3.2
2217	>	* Returns the stamp bits for resizing a table of size n.
2218	>	* Must be negative when shifted left by RESIZE_STAMP_SHIFT.
2219		*/
2220	<	private static final int tableSizeFor(int c) {
2221	<	int n = c - 1;
1862	<	n |= n >>> 1;
1863	<	n |= n >>> 2;
1864	<	n |= n >>> 4;
1865	<	n |= n >>> 8;
1866	<	n |= n >>> 16;
1867	<	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
2220	>	static final int resizeStamp(int n) {
2221	>	return Integer.numberOfLeadingZeros(n) | (1 << (RESIZE_STAMP_BITS - 1));
2222		}
2223
2224		/**
2225		* Initializes table, using the size recorded in sizeCtl.
2226		*/
2227	<	private final Node[] initTable() {
2228	<	Node[] tab; int sc;
2229	<	while ((tab = table) == null) {
2227	>	private final Node<K,V>[] initTable() {
2228	>	Node<K,V>[] tab; int sc;
2229	>	while ((tab = table) == null || tab.length == 0) {
2230		if ((sc = sizeCtl) < 0)
2231		Thread.yield(); // lost initialization race; just spin
2232		else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2233		try {
2234	<	if ((tab = table) == null) {
2234	>	if ((tab = table) == null || tab.length == 0) {
2235		int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2236	<	tab = table = new Node[n];
2236	>	@SuppressWarnings("unchecked")
2237	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2238	>	table = tab = nt;
2239		sc = n - (n >>> 2);
2240		}
2241		} finally {
#	Line 1920 | Line 2276 | public class ConcurrentHashMapV8<K, V>
2276		s = sumCount();
2277		}
2278		if (check >= 0) {
2279	<	Node[] tab, nt; int sc;
2279	>	Node<K,V>[] tab, nt; int n, sc;
2280		while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2281	<	tab.length < MAXIMUM_CAPACITY) {
2281	>	(n = tab.length) < MAXIMUM_CAPACITY) {
2282	>	int rs = resizeStamp(n);
2283		if (sc < 0) {
2284	<	if (sc == -1 || transferIndex <= transferOrigin ||
2285	<	(nt = nextTable) == null)
2284	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2285	>	sc == rs + MAX_RESIZERS || (nt = nextTable) == null ||
2286	>	transferIndex <= 0)
2287		break;
2288	<	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2288	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1))
2289		transfer(tab, nt);
2290		}
2291	<	else if (U.compareAndSwapInt(this, SIZECTL, sc, -2))
2291	>	else if (U.compareAndSwapInt(this, SIZECTL, sc,
2292	>	(rs << RESIZE_STAMP_SHIFT) + 2))
2293		transfer(tab, null);
2294		s = sumCount();
2295		}
#	Line 1938 | Line 2297 | public class ConcurrentHashMapV8<K, V>
2297		}
2298
2299		/**
2300	+	* Helps transfer if a resize is in progress.
2301	+	*/
2302	+	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2303	+	Node<K,V>[] nextTab; int sc;
2304	+	if (tab != null && (f instanceof ForwardingNode) &&
2305	+	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2306	+	int rs = resizeStamp(tab.length);
2307	+	while (nextTab == nextTable && table == tab &&
2308	+	(sc = sizeCtl) < 0) {
2309	+	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2310	+	sc == rs + MAX_RESIZERS || transferIndex <= 0)
2311	+	break;
2312	+	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1)) {
2313	+	transfer(tab, nextTab);
2314	+	break;
2315	+	}
2316	+	}
2317	+	return nextTab;
2318	+	}
2319	+	return table;
2320	+	}
2321	+
2322	+	/**
2323		* Tries to presize table to accommodate the given number of elements.
2324		*
2325		* @param size number of elements (doesn't need to be perfectly accurate)
#	Line 1947 | Line 2329 | public class ConcurrentHashMapV8<K, V>
2329		tableSizeFor(size + (size >>> 1) + 1);
2330		int sc;
2331		while ((sc = sizeCtl) >= 0) {
2332	<	Node[] tab = table; int n;
2332	>	Node<K,V>[] tab = table; int n;
2333		if (tab == null || (n = tab.length) == 0) {
2334		n = (sc > c) ? sc : c;
2335		if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2336		try {
2337		if (table == tab) {
2338	<	table = new Node[n];
2338	>	@SuppressWarnings("unchecked")
2339	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2340	>	table = nt;
2341		sc = n - (n >>> 2);
2342		}
2343		} finally {
#	Line 1963 | Line 2347 | public class ConcurrentHashMapV8<K, V>
2347		}
2348		else if (c <= sc || n >= MAXIMUM_CAPACITY)
2349		break;
2350	<	else if (tab == table &&
2351	<	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2352	<	transfer(tab, null);
2350	>	else if (tab == table) {
2351	>	int rs = resizeStamp(n);
2352	>	if (sc < 0) {
2353	>	Node<K,V>[] nt;
2354	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2355	>	sc == rs + MAX_RESIZERS || (nt = nextTable) == null ||
2356	>	transferIndex <= 0)
2357	>	break;
2358	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1))
2359	>	transfer(tab, nt);
2360	>	}
2361	>	else if (U.compareAndSwapInt(this, SIZECTL, sc,
2362	>	(rs << RESIZE_STAMP_SHIFT) + 2))
2363	>	transfer(tab, null);
2364	>	}
2365		}
2366		}
2367
2368	<	/*
2368	>	/**
2369		* Moves and/or copies the nodes in each bin to new table. See
2370		* above for explanation.
2371		*/
2372	<	private final void transfer(Node[] tab, Node[] nextTab) {
2372	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2373		int n = tab.length, stride;
2374		if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2375		stride = MIN_TRANSFER_STRIDE; // subdivide range
2376		if (nextTab == null) {            // initiating
2377		try {
2378	<	nextTab = new Node[n << 1];
2379	<	} catch(Throwable ex) {       // try to cope with OOME
2378	>	@SuppressWarnings("unchecked")
2379	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n << 1];
2380	>	nextTab = nt;
2381	>	} catch (Throwable ex) {      // try to cope with OOME
2382		sizeCtl = Integer.MAX_VALUE;
2383		return;
2384		}
2385		nextTable = nextTab;
1988	–	transferOrigin = n;
2386		transferIndex = n;
1990	–	Node rev = new Node(MOVED, tab, null, null);
1991	–	for (int k = n; k > 0;) {    // progressively reveal ready slots
1992	–	int nextk = k > stride? k - stride : 0;
1993	–	for (int m = nextk; m < k; ++m)
1994	–	nextTab[m] = rev;
1995	–	for (int m = n + nextk; m < n + k; ++m)
1996	–	nextTab[m] = rev;
1997	–	U.putOrderedInt(this, TRANSFERORIGIN, k = nextk);
1998	–	}
2387		}
2388		int nextn = nextTab.length;
2389	<	Node fwd = new Node(MOVED, nextTab, null, null);
2389	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2390		boolean advance = true;
2391	+	boolean finishing = false; // to ensure sweep before committing nextTab
2392		for (int i = 0, bound = 0;;) {
2393	<	int nextIndex, nextBound; Node f; Object fk;
2393	>	Node<K,V> f; int fh;
2394		while (advance) {
2395	<	if (--i >= bound)
2395	>	int nextIndex, nextBound;
2396	>	if (--i >= bound || finishing)
2397		advance = false;
2398	<	else if ((nextIndex = transferIndex) <= transferOrigin) {
2398	>	else if ((nextIndex = transferIndex) <= 0) {
2399		i = -1;
2400		advance = false;
2401		}
2402		else if (U.compareAndSwapInt
2403		(this, TRANSFERINDEX, nextIndex,
2404	<	nextBound = (nextIndex > stride?
2404	>	nextBound = (nextIndex > stride ?
2405		nextIndex - stride : 0))) {
2406		bound = nextBound;
2407		i = nextIndex - 1;
#	Line 2019 | Line 2409 | public class ConcurrentHashMapV8<K, V>
2409		}
2410		}
2411		if (i < 0 || i >= n || i + n >= nextn) {
2412	<	for (int sc;;) {
2413	<	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, ++sc)) {
2414	<	if (sc == -1) {
2415	<	nextTable = null;
2416	<	table = nextTab;
2417	<	sizeCtl = (n << 1) - (n >>> 1);
2028	<	}
2029	<	return;
2030	<	}
2412	>	int sc;
2413	>	if (finishing) {
2414	>	nextTable = null;
2415	>	table = nextTab;
2416	>	sizeCtl = (n << 1) - (n >>> 1);
2417	>	return;
2418		}
2419	<	}
2420	<	else if ((f = tabAt(tab, i)) == null) {
2421	<	if (casTabAt(tab, i, null, fwd)) {
2422	<	setTabAt(nextTab, i, null);
2423	<	setTabAt(nextTab, i + n, null);
2037	<	advance = true;
2419	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, sc - 1)) {
2420	>	if ((sc - 2) != resizeStamp(n))
2421	>	return;
2422	>	finishing = advance = true;
2423	>	i = n; // recheck before commit
2424		}
2425		}
2426	<	else if (f.hash >= 0) {
2427	<	synchronized(f) {
2426	>	else if ((f = tabAt(tab, i)) == null)
2427	>	advance = casTabAt(tab, i, null, fwd);
2428	>	else if ((fh = f.hash) == MOVED)
2429	>	advance = true; // already processed
2430	>	else {
2431	>	synchronized (f) {
2432		if (tabAt(tab, i) == f) {
2433	<	int runBit = f.hash & n;
2434	<	Node lastRun = f, lo = null, hi = null;
2435	<	for (Node p = f.next; p != null; p = p.next) {
2436	<	int b = p.hash & n;
2437	<	if (b != runBit) {
2438	<	runBit = b;
2439	<	lastRun = p;
2433	>	Node<K,V> ln, hn;
2434	>	if (fh >= 0) {
2435	>	int runBit = fh & n;
2436	>	Node<K,V> lastRun = f;
2437	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2438	>	int b = p.hash & n;
2439	>	if (b != runBit) {
2440	>	runBit = b;
2441	>	lastRun = p;
2442	>	}
2443		}
2444	<	}
2445	<	if (runBit == 0)
2446	<	lo = lastRun;
2054	<	else
2055	<	hi = lastRun;
2056	<	for (Node p = f; p != lastRun; p = p.next) {
2057	<	int ph = p.hash;
2058	<	Object pk = p.key, pv = p.val;
2059	<	if ((ph & n) == 0)
2060	<	lo = new Node(ph, pk, pv, lo);
2061	<	else
2062	<	hi = new Node(ph, pk, pv, hi);
2063	<	}
2064	<	setTabAt(nextTab, i, lo);
2065	<	setTabAt(nextTab, i + n, hi);
2066	<	setTabAt(tab, i, fwd);
2067	<	advance = true;
2068	<	}
2069	<	}
2070	<	}
2071	<	else if ((fk = f.key) instanceof TreeBin) {
2072	<	TreeBin t = (TreeBin)fk;
2073	<	t.acquire(0);
2074	<	try {
2075	<	if (tabAt(tab, i) == f) {
2076	<	TreeBin lt = new TreeBin();
2077	<	TreeBin ht = new TreeBin();
2078	<	int lc = 0, hc = 0;
2079	<	for (Node e = t.first; e != null; e = e.next) {
2080	<	int h = e.hash;
2081	<	Object k = e.key, v = e.val;
2082	<	if ((h & n) == 0) {
2083	<	++lc;
2084	<	lt.putTreeNode(h, k, v);
2444	>	if (runBit == 0) {
2445	>	ln = lastRun;
2446	>	hn = null;
2447		}
2448		else {
2449	<	++hc;
2450	<	ht.putTreeNode(h, k, v);
2449	>	hn = lastRun;
2450	>	ln = null;
2451		}
2452	+	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2453	+	int ph = p.hash; K pk = p.key; V pv = p.val;
2454	+	if ((ph & n) == 0)
2455	+	ln = new Node<K,V>(ph, pk, pv, ln);
2456	+	else
2457	+	hn = new Node<K,V>(ph, pk, pv, hn);
2458	+	}
2459	+	setTabAt(nextTab, i, ln);
2460	+	setTabAt(nextTab, i + n, hn);
2461	+	setTabAt(tab, i, fwd);
2462	+	advance = true;
2463		}
2464	<	Node ln, hn; // throw away trees if too small
2465	<	if (lc < TREE_THRESHOLD) {
2466	<	ln = null;
2467	<	for (Node p = lt.first; p != null; p = p.next)
2468	<	ln = new Node(p.hash, p.key, p.val, ln);
2469	<	}
2470	<	else
2471	<	ln = new Node(MOVED, lt, null, null);
2472	<	setTabAt(nextTab, i, ln);
2473	<	if (hc < TREE_THRESHOLD) {
2474	<	hn = null;
2475	<	for (Node p = ht.first; p != null; p = p.next)
2476	<	hn = new Node(p.hash, p.key, p.val, hn);
2464	>	else if (f instanceof TreeBin) {
2465	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2466	>	TreeNode<K,V> lo = null, loTail = null;
2467	>	TreeNode<K,V> hi = null, hiTail = null;
2468	>	int lc = 0, hc = 0;
2469	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2470	>	int h = e.hash;
2471	>	TreeNode<K,V> p = new TreeNode<K,V>
2472	>	(h, e.key, e.val, null, null);
2473	>	if ((h & n) == 0) {
2474	>	if ((p.prev = loTail) == null)
2475	>	lo = p;
2476	>	else
2477	>	loTail.next = p;
2478	>	loTail = p;
2479	>	++lc;
2480	>	}
2481	>	else {
2482	>	if ((p.prev = hiTail) == null)
2483	>	hi = p;
2484	>	else
2485	>	hiTail.next = p;
2486	>	hiTail = p;
2487	>	++hc;
2488	>	}
2489	>	}
2490	>	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2491	>	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2492	>	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2493	>	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2494	>	setTabAt(nextTab, i, ln);
2495	>	setTabAt(nextTab, i + n, hn);
2496	>	setTabAt(tab, i, fwd);
2497	>	advance = true;
2498		}
2105	–	else
2106	–	hn = new Node(MOVED, ht, null, null);
2107	–	setTabAt(nextTab, i + n, hn);
2108	–	setTabAt(tab, i, fwd);
2109	–	advance = true;
2499		}
2111	–	} finally {
2112	–	t.release(0);
2500		}
2501		}
2115	–	else
2116	–	advance = true; // already processed
2502		}
2503		}
2504
2505	<	/* ---------------- Counter support -------------- */
2505	>	/* ---------------- Conversion from/to TreeBins -------------- */
2506
2507	<	final long sumCount() {
2508	<	CounterCell[] as = counterCells; CounterCell a;
2509	<	long sum = baseCount;
2510	<	if (as != null) {
2511	<	for (int i = 0; i < as.length; ++i) {
2512	<	if ((a = as[i]) != null)
2513	<	sum += a.value;
2514	<	}
2515	<	}
2516	<	return sum;
2517	<	}
2518	<
2519	<	// See LongAdder version for explanation
2520	<	private final void fullAddCount(long x, CounterHashCode hc,
2521	<	boolean wasUncontended) {
2522	<	int h;
2523	<	if (hc == null) {
2524	<	hc = new CounterHashCode();
2525	<	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
2526	<	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
2527	<	threadCounterHashCode.set(hc);
2528	<	}
2144	<	else
2145	<	h = hc.code;
2146	<	boolean collide = false;                // True if last slot nonempty
2147	<	for (;;) {
2148	<	CounterCell[] as; CounterCell a; int n; long v;
2149	<	if ((as = counterCells) != null && (n = as.length) > 0) {
2150	<	if ((a = as[(n - 1) & h]) == null) {
2151	<	if (counterBusy == 0) {            // Try to attach new Cell
2152	<	CounterCell r = new CounterCell(x); // Optimistic create
2153	<	if (counterBusy == 0 &&
2154	<	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2155	<	boolean created = false;
2156	<	try {               // Recheck under lock
2157	<	CounterCell[] rs; int m, j;
2158	<	if ((rs = counterCells) != null &&
2159	<	(m = rs.length) > 0 &&
2160	<	rs[j = (m - 1) & h] == null) {
2161	<	rs[j] = r;
2162	<	created = true;
2163	<	}
2164	<	} finally {
2165	<	counterBusy = 0;
2166	<	}
2167	<	if (created)
2168	<	break;
2169	<	continue;           // Slot is now non-empty
2170	<	}
2171	<	}
2172	<	collide = false;
2173	<	}
2174	<	else if (!wasUncontended)       // CAS already known to fail
2175	<	wasUncontended = true;      // Continue after rehash
2176	<	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
2177	<	break;
2178	<	else if (counterCells != as || n >= NCPU)
2179	<	collide = false;            // At max size or stale
2180	<	else if (!collide)
2181	<	collide = true;
2182	<	else if (counterBusy == 0 &&
2183	<	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2184	<	try {
2185	<	if (counterCells == as) {// Expand table unless stale
2186	<	CounterCell[] rs = new CounterCell[n << 1];
2187	<	for (int i = 0; i < n; ++i)
2188	<	rs[i] = as[i];
2189	<	counterCells = rs;
2507	>	/**
2508	>	* Replaces all linked nodes in bin at given index unless table is
2509	>	* too small, in which case resizes instead.
2510	>	*/
2511	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2512	>	Node<K,V> b; int n, sc;
2513	>	if (tab != null) {
2514	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY)
2515	>	tryPresize(n << 1);
2516	>	else if ((b = tabAt(tab, index)) != null && b.hash >= 0) {
2517	>	synchronized (b) {
2518	>	if (tabAt(tab, index) == b) {
2519	>	TreeNode<K,V> hd = null, tl = null;
2520	>	for (Node<K,V> e = b; e != null; e = e.next) {
2521	>	TreeNode<K,V> p =
2522	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2523	>	null, null);
2524	>	if ((p.prev = tl) == null)
2525	>	hd = p;
2526	>	else
2527	>	tl.next = p;
2528	>	tl = p;
2529		}
2530	<	} finally {
2192	<	counterBusy = 0;
2530	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2531		}
2194	–	collide = false;
2195	–	continue;                   // Retry with expanded table
2532		}
2197	–	h ^= h << 13;                   // Rehash
2198	–	h ^= h >>> 17;
2199	–	h ^= h << 5;
2533		}
2201	–	else if (counterBusy == 0 && counterCells == as &&
2202	–	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2203	–	boolean init = false;
2204	–	try {                           // Initialize table
2205	–	if (counterCells == as) {
2206	–	CounterCell[] rs = new CounterCell[2];
2207	–	rs[h & 1] = new CounterCell(x);
2208	–	counterCells = rs;
2209	–	init = true;
2210	–	}
2211	–	} finally {
2212	–	counterBusy = 0;
2213	–	}
2214	–	if (init)
2215	–	break;
2216	–	}
2217	–	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
2218	–	break;                          // Fall back on using base
2534		}
2535	<	hc.code = h;                            // Record index for next time
2535	>	}
2536	>	/**
2537	>	* Returns a list on non-TreeNodes replacing those in given list.
2538	>	*/
2539	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2540	>	Node<K,V> hd = null, tl = null;
2541	>	for (Node<K,V> q = b; q != null; q = q.next) {
2542	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2543	>	if (tl == null)
2544	>	hd = p;
2545	>	else
2546	>	tl.next = p;
2547	>	tl = p;
2548	>	}
2549	>	return hd;
2550		}
2551
2552	<	/* ----------------Table Traversal -------------- */
2552	>	/* ---------------- TreeNodes -------------- */
2553
2554		/**
2555	<	* Encapsulates traversal for methods such as containsValue; also
2556	<	* serves as a base class for other iterators and bulk tasks.
2557	<	*
2558	<	* At each step, the iterator snapshots the key ("nextKey") and
2559	<	* value ("nextVal") of a valid node (i.e., one that, at point of
2560	<	* snapshot, has a non-null user value). Because val fields can
2561	<	* change (including to null, indicating deletion), field nextVal
2562	<	* might not be accurate at point of use, but still maintains the
2234	<	* weak consistency property of holding a value that was once
2235	<	* valid. To support iterator.remove, the nextKey field is not
2236	<	* updated (nulled out) when the iterator cannot advance.
2237	<	*
2238	<	* Internal traversals directly access these fields, as in:
2239	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2240	<	*
2241	<	* Exported iterators must track whether the iterator has advanced
2242	<	* (in hasNext vs next) (by setting/checking/nulling field
2243	<	* nextVal), and then extract key, value, or key-value pairs as
2244	<	* return values of next().
2245	<	*
2246	<	* The iterator visits once each still-valid node that was
2247	<	* reachable upon iterator construction. It might miss some that
2248	<	* were added to a bin after the bin was visited, which is OK wrt
2249	<	* consistency guarantees. Maintaining this property in the face
2250	<	* of possible ongoing resizes requires a fair amount of
2251	<	* bookkeeping state that is difficult to optimize away amidst
2252	<	* volatile accesses.  Even so, traversal maintains reasonable
2253	<	* throughput.
2254	<	*
2255	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2256	<	* However, if the table has been resized, then all future steps
2257	<	* must traverse both the bin at the current index as well as at
2258	<	* (index + baseSize); and so on for further resizings. To
2259	<	* paranoically cope with potential sharing by users of iterators
2260	<	* across threads, iteration terminates if a bounds checks fails
2261	<	* for a table read.
2262	<	*
2263	<	* This class extends CountedCompleter to streamline parallel
2264	<	* iteration in bulk operations. This adds only a few fields of
2265	<	* space overhead, which is small enough in cases where it is not
2266	<	* needed to not worry about it.  Because CountedCompleter is
2267	<	* Serializable, but iterators need not be, we need to add warning
2268	<	* suppressions.
2269	<	*/
2270	<	@SuppressWarnings("serial") static class Traverser<K,V,R>
2271	<	extends CountedCompleter<R> {
2272	<	final ConcurrentHashMapV8<K, V> map;
2273	<	Node next;           // the next entry to use
2274	<	Object nextKey;      // cached key field of next
2275	<	Object nextVal;      // cached val field of next
2276	<	Node[] tab;          // current table; updated if resized
2277	<	int index;           // index of bin to use next
2278	<	int baseIndex;       // current index of initial table
2279	<	int baseLimit;       // index bound for initial table
2280	<	int baseSize;        // initial table size
2281	<	int batch;           // split control
2555	>	* Nodes for use in TreeBins
2556	>	*/
2557	>	static final class TreeNode<K,V> extends Node<K,V> {
2558	>	TreeNode<K,V> parent;  // red-black tree links
2559	>	TreeNode<K,V> left;
2560	>	TreeNode<K,V> right;
2561	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2562	>	boolean red;
2563
2564	<	/** Creates iterator for all entries in the table. */
2565	<	Traverser(ConcurrentHashMapV8<K, V> map) {
2566	<	this.map = map;
2564	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2565	>	TreeNode<K,V> parent) {
2566	>	super(hash, key, val, next);
2567	>	this.parent = parent;
2568		}
2569
2570	<	/** Creates iterator for split() methods and task constructors */
2571	<	Traverser(ConcurrentHashMapV8<K,V> map, Traverser<K,V,?> it, int batch) {
2290	<	super(it);
2291	<	this.batch = batch;
2292	<	if ((this.map = map) != null && it != null) { // split parent
2293	<	Node[] t;
2294	<	if ((t = it.tab) == null &&
2295	<	(t = it.tab = map.table) != null)
2296	<	it.baseLimit = it.baseSize = t.length;
2297	<	this.tab = t;
2298	<	this.baseSize = it.baseSize;
2299	<	int hi = this.baseLimit = it.baseLimit;
2300	<	it.baseLimit = this.index = this.baseIndex =
2301	<	(hi + it.baseIndex + 1) >>> 1;
2302	<	}
2570	>	Node<K,V> find(int h, Object k) {
2571	>	return findTreeNode(h, k, null);
2572		}
2573
2574		/**
2575	<	* Advances next; returns nextVal or null if terminated.
2576	<	* See above for explanation.
2575	>	* Returns the TreeNode (or null if not found) for the given key
2576	>	* starting at given root.
2577		*/
2578	<	final Object advance() {
2579	<	Node e = next;
2580	<	Object ev = null;
2581	<	outer: do {
2582	<	if (e != null)                  // advance past used/skipped node
2583	<	e = e.next;
2584	<	while (e == null) {             // get to next non-null bin
2585	<	ConcurrentHashMapV8<K, V> m;
2586	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2587	<	if ((t = tab) != null)
2588	<	n = t.length;
2589	<	else if ((m = map) != null && (t = tab = m.table) != null)
2590	<	n = baseLimit = baseSize = t.length;
2578	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2579	>	if (k != null) {
2580	>	TreeNode<K,V> p = this;
2581	>	do  {
2582	>	int ph, dir; K pk; TreeNode<K,V> q;
2583	>	TreeNode<K,V> pl = p.left, pr = p.right;
2584	>	if ((ph = p.hash) > h)
2585	>	p = pl;
2586	>	else if (ph < h)
2587	>	p = pr;
2588	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2589	>	return p;
2590	>	else if (pl == null)
2591	>	p = pr;
2592	>	else if (pr == null)
2593	>	p = pl;
2594	>	else if ((kc != null ||
2595	>	(kc = comparableClassFor(k)) != null) &&
2596	>	(dir = compareComparables(kc, k, pk)) != 0)
2597	>	p = (dir < 0) ? pl : pr;
2598	>	else if ((q = pr.findTreeNode(h, k, kc)) != null)
2599	>	return q;
2600		else
2601	<	break outer;
2602	<	if ((b = baseIndex) >= baseLimit ||
2603	<	(i = index) < 0 || i >= n)
2604	<	break outer;
2327	<	if ((e = tabAt(t, i)) != null && e.hash < 0) {
2328	<	if ((ek = e.key) instanceof TreeBin)
2329	<	e = ((TreeBin)ek).first;
2330	<	else {
2331	<	tab = (Node[])ek;
2332	<	continue;           // restarts due to null val
2333	<	}
2334	<	}                           // visit upper slots if present
2335	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2336	<	}
2337	<	nextKey = e.key;
2338	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2339	<	next = e;
2340	<	return nextVal = ev;
2601	>	p = pl;
2602	>	} while (p != null);
2603	>	}
2604	>	return null;
2605		}
2606	+	}
2607
2608	<	public final void remove() {
2344	<	Object k = nextKey;
2345	<	if (k == null && (advance() == null || (k = nextKey) == null))
2346	<	throw new IllegalStateException();
2347	<	map.internalReplace(k, null, null);
2348	<	}
2608	>	/* ---------------- TreeBins -------------- */
2609
2610	<	public final boolean hasNext() {
2611	<	return nextVal != null || advance() != null;
2610	>	/**
2611	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2612	>	* keys or values, but instead point to list of TreeNodes and
2613	>	* their root. They also maintain a parasitic read-write lock
2614	>	* forcing writers (who hold bin lock) to wait for readers (who do
2615	>	* not) to complete before tree restructuring operations.
2616	>	*/
2617	>	static final class TreeBin<K,V> extends Node<K,V> {
2618	>	TreeNode<K,V> root;
2619	>	volatile TreeNode<K,V> first;
2620	>	volatile Thread waiter;
2621	>	volatile int lockState;
2622	>	// values for lockState
2623	>	static final int WRITER = 1; // set while holding write lock
2624	>	static final int WAITER = 2; // set when waiting for write lock
2625	>	static final int READER = 4; // increment value for setting read lock
2626	>
2627	>	/**
2628	>	* Tie-breaking utility for ordering insertions when equal
2629	>	* hashCodes and non-comparable. We don't require a total
2630	>	* order, just a consistent insertion rule to maintain
2631	>	* equivalence across rebalancings. Tie-breaking further than
2632	>	* necessary simplifies testing a bit.
2633	>	*/
2634	>	static int tieBreakOrder(Object a, Object b) {
2635	>	int d;
2636	>	if (a == null || b == null ||
2637	>	(d = a.getClass().getName().
2638	>	compareTo(b.getClass().getName())) == 0)
2639	>	d = (System.identityHashCode(a) <= System.identityHashCode(b) ?
2640	>	-1 : 1);
2641	>	return d;
2642		}
2643
2644	<	public final boolean hasMoreElements() { return hasNext(); }
2645	<
2646	<	public void compute() { } // default no-op CountedCompleter body
2644	>	/**
2645	>	* Creates bin with initial set of nodes headed by b.
2646	>	*/
2647	>	TreeBin(TreeNode<K,V> b) {
2648	>	super(TREEBIN, null, null, null);
2649	>	this.first = b;
2650	>	TreeNode<K,V> r = null;
2651	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2652	>	next = (TreeNode<K,V>)x.next;
2653	>	x.left = x.right = null;
2654	>	if (r == null) {
2655	>	x.parent = null;
2656	>	x.red = false;
2657	>	r = x;
2658	>	}
2659	>	else {
2660	>	K k = x.key;
2661	>	int h = x.hash;
2662	>	Class<?> kc = null;
2663	>	for (TreeNode<K,V> p = r;;) {
2664	>	int dir, ph;
2665	>	K pk = p.key;
2666	>	if ((ph = p.hash) > h)
2667	>	dir = -1;
2668	>	else if (ph < h)
2669	>	dir = 1;
2670	>	else if ((kc == null &&
2671	>	(kc = comparableClassFor(k)) == null) ||
2672	>	(dir = compareComparables(kc, k, pk)) == 0)
2673	>	dir = tieBreakOrder(k, pk);
2674	>	TreeNode<K,V> xp = p;
2675	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2676	>	x.parent = xp;
2677	>	if (dir <= 0)
2678	>	xp.left = x;
2679	>	else
2680	>	xp.right = x;
2681	>	r = balanceInsertion(r, x);
2682	>	break;
2683	>	}
2684	>	}
2685	>	}
2686	>	}
2687	>	this.root = r;
2688	>	assert checkInvariants(root);
2689	>	}
2690
2691		/**
2692	<	* Returns a batch value > 0 if this task should (and must) be
2360	<	* split, if so, adding to pending count, and in any case
2361	<	* updating batch value. The initial batch value is approx
2362	<	* exp2 of the number of times (minus one) to split task by
2363	<	* two before executing leaf action. This value is faster to
2364	<	* compute and more convenient to use as a guide to splitting
2365	<	* than is the depth, since it is used while dividing by two
2366	<	* anyway.
2692	>	* Acquires write lock for tree restructuring.
2693		*/
2694	<	final int preSplit() {
2695	<	ConcurrentHashMapV8<K, V> m; int b; Node[] t;  ForkJoinPool pool;
2696	<	if ((b = batch) < 0 && (m = map) != null) { // force initialization
2371	<	if ((t = tab) == null && (t = tab = m.table) != null)
2372	<	baseLimit = baseSize = t.length;
2373	<	if (t != null) {
2374	<	long n = m.sumCount();
2375	<	int par = ((pool = getPool()) == null) ?
2376	<	ForkJoinPool.getCommonPoolParallelism() :
2377	<	pool.getParallelism();
2378	<	int sp = par << 3; // slack of 8
2379	<	b = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
2380	<	}
2381	<	}
2382	<	b = (b <= 1 || baseIndex == baseLimit) ? 0 : (b >>> 1);
2383	<	if ((batch = b) > 0)
2384	<	addToPendingCount(1);
2385	<	return b;
2694	>	private final void lockRoot() {
2695	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2696	>	contendedLock(); // offload to separate method
2697		}
2698
2699	<	}
2700	<
2701	<	/* ---------------- Public operations -------------- */
2702	<
2703	<	/**
2393	<	* Creates a new, empty map with the default initial table size (16).
2394	<	*/
2395	<	public ConcurrentHashMapV8() {
2396	<	}
2397	<
2398	<	/**
2399	<	* Creates a new, empty map with an initial table size
2400	<	* accommodating the specified number of elements without the need
2401	<	* to dynamically resize.
2402	<	*
2403	<	* @param initialCapacity The implementation performs internal
2404	<	* sizing to accommodate this many elements.
2405	<	* @throws IllegalArgumentException if the initial capacity of
2406	<	* elements is negative
2407	<	*/
2408	<	public ConcurrentHashMapV8(int initialCapacity) {
2409	<	if (initialCapacity < 0)
2410	<	throw new IllegalArgumentException();
2411	<	int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
2412	<	MAXIMUM_CAPACITY :
2413	<	tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2414	<	this.sizeCtl = cap;
2415	<	}
2416	<
2417	<	/**
2418	<	* Creates a new map with the same mappings as the given map.
2419	<	*
2420	<	* @param m the map
2421	<	*/
2422	<	public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2423	<	this.sizeCtl = DEFAULT_CAPACITY;
2424	<	internalPutAll(m);
2425	<	}
2426	<
2427	<	/**
2428	<	* Creates a new, empty map with an initial table size based on
2429	<	* the given number of elements ({@code initialCapacity}) and
2430	<	* initial table density ({@code loadFactor}).
2431	<	*
2432	<	* @param initialCapacity the initial capacity. The implementation
2433	<	* performs internal sizing to accommodate this many elements,
2434	<	* given the specified load factor.
2435	<	* @param loadFactor the load factor (table density) for
2436	<	* establishing the initial table size
2437	<	* @throws IllegalArgumentException if the initial capacity of
2438	<	* elements is negative or the load factor is nonpositive
2439	<	*
2440	<	* @since 1.6
2441	<	*/
2442	<	public ConcurrentHashMapV8(int initialCapacity, float loadFactor) {
2443	<	this(initialCapacity, loadFactor, 1);
2444	<	}
2445	<
2446	<	/**
2447	<	* Creates a new, empty map with an initial table size based on
2448	<	* the given number of elements ({@code initialCapacity}), table
2449	<	* density ({@code loadFactor}), and number of concurrently
2450	<	* updating threads ({@code concurrencyLevel}).
2451	<	*
2452	<	* @param initialCapacity the initial capacity. The implementation
2453	<	* performs internal sizing to accommodate this many elements,
2454	<	* given the specified load factor.
2455	<	* @param loadFactor the load factor (table density) for
2456	<	* establishing the initial table size
2457	<	* @param concurrencyLevel the estimated number of concurrently
2458	<	* updating threads. The implementation may use this value as
2459	<	* a sizing hint.
2460	<	* @throws IllegalArgumentException if the initial capacity is
2461	<	* negative or the load factor or concurrencyLevel are
2462	<	* nonpositive
2463	<	*/
2464	<	public ConcurrentHashMapV8(int initialCapacity,
2465	<	float loadFactor, int concurrencyLevel) {
2466	<	if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
2467	<	throw new IllegalArgumentException();
2468	<	if (initialCapacity < concurrencyLevel)   // Use at least as many bins
2469	<	initialCapacity = concurrencyLevel;   // as estimated threads
2470	<	long size = (long)(1.0 + (long)initialCapacity / loadFactor);
2471	<	int cap = (size >= (long)MAXIMUM_CAPACITY) ?
2472	<	MAXIMUM_CAPACITY : tableSizeFor((int)size);
2473	<	this.sizeCtl = cap;
2474	<	}
2475	<
2476	<	/**
2477	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2478	<	* from the given type to {@code Boolean.TRUE}.
2479	<	*
2480	<	* @return the new set
2481	<	*/
2482	<	public static <K> KeySetView<K,Boolean> newKeySet() {
2483	<	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(),
2484	<	Boolean.TRUE);
2485	<	}
2486	<
2487	<	/**
2488	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2489	<	* from the given type to {@code Boolean.TRUE}.
2490	<	*
2491	<	* @param initialCapacity The implementation performs internal
2492	<	* sizing to accommodate this many elements.
2493	<	* @throws IllegalArgumentException if the initial capacity of
2494	<	* elements is negative
2495	<	* @return the new set
2496	<	*/
2497	<	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2498	<	return new KeySetView<K,Boolean>
2499	<	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2500	<	}
2501	<
2502	<	/**
2503	<	* {@inheritDoc}
2504	<	*/
2505	<	public boolean isEmpty() {
2506	<	return sumCount() <= 0L; // ignore transient negative values
2507	<	}
2508	<
2509	<	/**
2510	<	* {@inheritDoc}
2511	<	*/
2512	<	public int size() {
2513	<	long n = sumCount();
2514	<	return ((n < 0L) ? 0 :
2515	<	(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
2516	<	(int)n);
2517	<	}
2518	<
2519	<	/**
2520	<	* Returns the number of mappings. This method should be used
2521	<	* instead of {@link #size} because a ConcurrentHashMapV8 may
2522	<	* contain more mappings than can be represented as an int. The
2523	<	* value returned is an estimate; the actual count may differ if
2524	<	* there are concurrent insertions or removals.
2525	<	*
2526	<	* @return the number of mappings
2527	<	*/
2528	<	public long mappingCount() {
2529	<	long n = sumCount();
2530	<	return (n < 0L) ? 0L : n; // ignore transient negative values
2531	<	}
2532	<
2533	<	/**
2534	<	* Returns the value to which the specified key is mapped,
2535	<	* or {@code null} if this map contains no mapping for the key.
2536	<	*
2537	<	* <p>More formally, if this map contains a mapping from a key
2538	<	* {@code k} to a value {@code v} such that {@code key.equals(k)},
2539	<	* then this method returns {@code v}; otherwise it returns
2540	<	* {@code null}.  (There can be at most one such mapping.)
2541	<	*
2542	<	* @throws NullPointerException if the specified key is null
2543	<	*/
2544	<	public V get(Object key) {
2545	<	return internalGet(key);
2546	<	}
2547	<
2548	<	/**
2549	<	* Returns the value to which the specified key is mapped,
2550	<	* or the given defaultValue if this map contains no mapping for the key.
2551	<	*
2552	<	* @param key the key
2553	<	* @param defaultValue the value to return if this map contains
2554	<	* no mapping for the given key
2555	<	* @return the mapping for the key, if present; else the defaultValue
2556	<	* @throws NullPointerException if the specified key is null
2557	<	*/
2558	<	public V getValueOrDefault(Object key, V defaultValue) {
2559	<	V v;
2560	<	return (v = internalGet(key)) == null ? defaultValue : v;
2561	<	}
2562	<
2563	<	/**
2564	<	* Tests if the specified object is a key in this table.
2565	<	*
2566	<	* @param  key   possible key
2567	<	* @return {@code true} if and only if the specified object
2568	<	*         is a key in this table, as determined by the
2569	<	*         {@code equals} method; {@code false} otherwise
2570	<	* @throws NullPointerException if the specified key is null
2571	<	*/
2572	<	public boolean containsKey(Object key) {
2573	<	return internalGet(key) != null;
2574	<	}
2575	<
2576	<	/**
2577	<	* Returns {@code true} if this map maps one or more keys to the
2578	<	* specified value. Note: This method may require a full traversal
2579	<	* of the map, and is much slower than method {@code containsKey}.
2580	<	*
2581	<	* @param value value whose presence in this map is to be tested
2582	<	* @return {@code true} if this map maps one or more keys to the
2583	<	*         specified value
2584	<	* @throws NullPointerException if the specified value is null
2585	<	*/
2586	<	public boolean containsValue(Object value) {
2587	<	if (value == null)
2588	<	throw new NullPointerException();
2589	<	Object v;
2590	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2591	<	while ((v = it.advance()) != null) {
2592	<	if (v == value || value.equals(v))
2593	<	return true;
2699	>	/**
2700	>	* Releases write lock for tree restructuring.
2701	>	*/
2702	>	private final void unlockRoot() {
2703	>	lockState = 0;
2704		}
2595	–	return false;
2596	–	}
2597	–
2598	–	/**
2599	–	* Legacy method testing if some key maps into the specified value
2600	–	* in this table.  This method is identical in functionality to
2601	–	* {@link #containsValue}, and exists solely to ensure
2602	–	* full compatibility with class {@link java.util.Hashtable},
2603	–	* which supported this method prior to introduction of the
2604	–	* Java Collections framework.
2605	–	*
2606	–	* @param  value a value to search for
2607	–	* @return {@code true} if and only if some key maps to the
2608	–	*         {@code value} argument in this table as
2609	–	*         determined by the {@code equals} method;
2610	–	*         {@code false} otherwise
2611	–	* @throws NullPointerException if the specified value is null
2612	–	*/
2613	–	public boolean contains(Object value) {
2614	–	return containsValue(value);
2615	–	}
2616	–
2617	–	/**
2618	–	* Maps the specified key to the specified value in this table.
2619	–	* Neither the key nor the value can be null.
2620	–	*
2621	–	* <p>The value can be retrieved by calling the {@code get} method
2622	–	* with a key that is equal to the original key.
2623	–	*
2624	–	* @param key key with which the specified value is to be associated
2625	–	* @param value value to be associated with the specified key
2626	–	* @return the previous value associated with {@code key}, or
2627	–	*         {@code null} if there was no mapping for {@code key}
2628	–	* @throws NullPointerException if the specified key or value is null
2629	–	*/
2630	–	public V put(K key, V value) {
2631	–	return internalPut(key, value, false);
2632	–	}
2705
2706	<	/**
2707	<	* {@inheritDoc}
2708	<	*
2709	<	* @return the previous value associated with the specified key,
2710	<	*         or {@code null} if there was no mapping for the key
2711	<	* @throws NullPointerException if the specified key or value is null
2712	<	*/
2713	<	public V putIfAbsent(K key, V value) {
2714	<	return internalPut(key, value, true);
2715	<	}
2716	<
2717	<	/**
2718	<	* Copies all of the mappings from the specified map to this one.
2719	<	* These mappings replace any mappings that this map had for any of the
2720	<	* keys currently in the specified map.
2721	<	*
2722	<	* @param m mappings to be stored in this map
2723	<	*/
2724	<	public void putAll(Map<? extends K, ? extends V> m) {
2725	<	internalPutAll(m);
2726	<	}
2727	<
2728	<	/**
2657	<	* If the specified key is not already associated with a value,
2658	<	* computes its value using the given mappingFunction and enters
2659	<	* it into the map unless null.  This is equivalent to
2660	<	* <pre> {@code
2661	<	* if (map.containsKey(key))
2662	<	*   return map.get(key);
2663	<	* value = mappingFunction.apply(key);
2664	<	* if (value != null)
2665	<	*   map.put(key, value);
2666	<	* return value;}</pre>
2667	<	*
2668	<	* except that the action is performed atomically.  If the
2669	<	* function returns {@code null} no mapping is recorded. If the
2670	<	* function itself throws an (unchecked) exception, the exception
2671	<	* is rethrown to its caller, and no mapping is recorded.  Some
2672	<	* attempted update operations on this map by other threads may be
2673	<	* blocked while computation is in progress, so the computation
2674	<	* should be short and simple, and must not attempt to update any
2675	<	* other mappings of this Map. The most appropriate usage is to
2676	<	* construct a new object serving as an initial mapped value, or
2677	<	* memoized result, as in:
2678	<	*
2679	<	*  <pre> {@code
2680	<	* map.computeIfAbsent(key, new Fun<K, V>() {
2681	<	*   public V map(K k) { return new Value(f(k)); }});}</pre>
2682	<	*
2683	<	* @param key key with which the specified value is to be associated
2684	<	* @param mappingFunction the function to compute a value
2685	<	* @return the current (existing or computed) value associated with
2686	<	*         the specified key, or null if the computed value is null
2687	<	* @throws NullPointerException if the specified key or mappingFunction
2688	<	*         is null
2689	<	* @throws IllegalStateException if the computation detectably
2690	<	*         attempts a recursive update to this map that would
2691	<	*         otherwise never complete
2692	<	* @throws RuntimeException or Error if the mappingFunction does so,
2693	<	*         in which case the mapping is left unestablished
2694	<	*/
2695	<	public V computeIfAbsent
2696	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
2697	<	return internalComputeIfAbsent(key, mappingFunction);
2698	<	}
2706	>	/**
2707	>	* Possibly blocks awaiting root lock.
2708	>	*/
2709	>	private final void contendedLock() {
2710	>	boolean waiting = false;
2711	>	for (int s;;) {
2712	>	if (((s = lockState) & ~WAITER) == 0) {
2713	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2714	>	if (waiting)
2715	>	waiter = null;
2716	>	return;
2717	>	}
2718	>	}
2719	>	else if ((s & WAITER) == 0) {
2720	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2721	>	waiting = true;
2722	>	waiter = Thread.currentThread();
2723	>	}
2724	>	}
2725	>	else if (waiting)
2726	>	LockSupport.park(this);
2727	>	}
2728	>	}
2729
2730	<	/**
2731	<	* If the given key is present, computes a new mapping value given a key and
2732	<	* its current mapped value. This is equivalent to
2733	<	*  <pre> {@code
2734	<	*   if (map.containsKey(key)) {
2735	<	*     value = remappingFunction.apply(key, map.get(key));
2736	<	*     if (value != null)
2737	<	*       map.put(key, value);
2738	<	*     else
2739	<	*       map.remove(key);
2740	<	*   }
2741	<	* }</pre>
2742	<	*
2743	<	* except that the action is performed atomically.  If the
2744	<	* function returns {@code null}, the mapping is removed.  If the
2745	<	* function itself throws an (unchecked) exception, the exception
2746	<	* is rethrown to its caller, and the current mapping is left
2747	<	* unchanged.  Some attempted update operations on this map by
2748	<	* other threads may be blocked while computation is in progress,
2749	<	* so the computation should be short and simple, and must not
2750	<	* attempt to update any other mappings of this Map. For example,
2751	<	* to either create or append new messages to a value mapping:
2752	<	*
2753	<	* @param key key with which the specified value is to be associated
2754	<	* @param remappingFunction the function to compute a value
2755	<	* @return the new value associated with the specified key, or null if none
2756	<	* @throws NullPointerException if the specified key or remappingFunction
2757	<	*         is null
2758	<	* @throws IllegalStateException if the computation detectably
2759	<	*         attempts a recursive update to this map that would
2760	<	*         otherwise never complete
2761	<	* @throws RuntimeException or Error if the remappingFunction does so,
2762	<	*         in which case the mapping is unchanged
2763	<	*/
2764	<	public V computeIfPresent
2765	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2736	<	return internalCompute(key, true, remappingFunction);
2737	<	}
2730	>	/**
2731	>	* Returns matching node or null if none. Tries to search
2732	>	* using tree comparisons from root, but continues linear
2733	>	* search when lock not available.
2734	>	*/
2735	>	final Node<K,V> find(int h, Object k) {
2736	>	if (k != null) {
2737	>	for (Node<K,V> e = first; e != null; ) {
2738	>	int s; K ek;
2739	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2740	>	if (e.hash == h &&
2741	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2742	>	return e;
2743	>	e = e.next;
2744	>	}
2745	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2746	>	s + READER)) {
2747	>	TreeNode<K,V> r, p;
2748	>	try {
2749	>	p = ((r = root) == null ? null :
2750	>	r.findTreeNode(h, k, null));
2751	>	} finally {
2752	>	Thread w;
2753	>	int ls;
2754	>	do {} while (!U.compareAndSwapInt
2755	>	(this, LOCKSTATE,
2756	>	ls = lockState, ls - READER));
2757	>	if (ls == (READER|WAITER) && (w = waiter) != null)
2758	>	LockSupport.unpark(w);
2759	>	}
2760	>	return p;
2761	>	}
2762	>	}
2763	>	}
2764	>	return null;
2765	>	}
2766
2767	<	/**
2768	<	* Computes a new mapping value given a key and
2769	<	* its current mapped value (or {@code null} if there is no current
2770	<	* mapping). This is equivalent to
2771	<	*  <pre> {@code
2772	<	*   value = remappingFunction.apply(key, map.get(key));
2773	<	*   if (value != null)
2774	<	*     map.put(key, value);
2775	<	*   else
2776	<	*     map.remove(key);
2777	<	* }</pre>
2778	<	*
2779	<	* except that the action is performed atomically.  If the
2780	<	* function returns {@code null}, the mapping is removed.  If the
2781	<	* function itself throws an (unchecked) exception, the exception
2782	<	* is rethrown to its caller, and the current mapping is left
2783	<	* unchanged.  Some attempted update operations on this map by
2784	<	* other threads may be blocked while computation is in progress,
2785	<	* so the computation should be short and simple, and must not
2786	<	* attempt to update any other mappings of this Map. For example,
2787	<	* to either create or append new messages to a value mapping:
2788	<	*
2789	<	* <pre> {@code
2790	<	* Map<Key, String> map = ...;
2791	<	* final String msg = ...;
2792	<	* map.compute(key, new BiFun<Key, String, String>() {
2793	<	*   public String apply(Key k, String v) {
2794	<	*    return (v == null) ? msg : v + msg;});}}</pre>
2795	<	*
2796	<	* @param key key with which the specified value is to be associated
2797	<	* @param remappingFunction the function to compute a value
2798	<	* @return the new value associated with the specified key, or null if none
2799	<	* @throws NullPointerException if the specified key or remappingFunction
2800	<	*         is null
2801	<	* @throws IllegalStateException if the computation detectably
2802	<	*         attempts a recursive update to this map that would
2803	<	*         otherwise never complete
2804	<	* @throws RuntimeException or Error if the remappingFunction does so,
2805	<	*         in which case the mapping is unchanged
2806	<	*/
2807	<	public V compute
2808	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2809	<	return internalCompute(key, false, remappingFunction);
2810	<	}
2767	>	/**
2768	>	* Finds or adds a node.
2769	>	* @return null if added
2770	>	*/
2771	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2772	>	Class<?> kc = null;
2773	>	boolean searched = false;
2774	>	for (TreeNode<K,V> p = root;;) {
2775	>	int dir, ph; K pk;
2776	>	if (p == null) {
2777	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2778	>	break;
2779	>	}
2780	>	else if ((ph = p.hash) > h)
2781	>	dir = -1;
2782	>	else if (ph < h)
2783	>	dir = 1;
2784	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2785	>	return p;
2786	>	else if ((kc == null &&
2787	>	(kc = comparableClassFor(k)) == null) ||
2788	>	(dir = compareComparables(kc, k, pk)) == 0) {
2789	>	if (!searched) {
2790	>	TreeNode<K,V> q, ch;
2791	>	searched = true;
2792	>	if (((ch = p.left) != null &&
2793	>	(q = ch.findTreeNode(h, k, kc)) != null) ||
2794	>	((ch = p.right) != null &&
2795	>	(q = ch.findTreeNode(h, k, kc)) != null))
2796	>	return q;
2797	>	}
2798	>	dir = tieBreakOrder(k, pk);
2799	>	}
2800	>
2801	>	TreeNode<K,V> xp = p;
2802	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2803	>	TreeNode<K,V> x, f = first;
2804	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2805	>	if (f != null)
2806	>	f.prev = x;
2807	>	if (dir <= 0)
2808	>	xp.left = x;
2809	>	else
2810	>	xp.right = x;
2811	>	if (!xp.red)
2812	>	x.red = true;
2813	>	else {
2814	>	lockRoot();
2815	>	try {
2816	>	root = balanceInsertion(root, x);
2817	>	} finally {
2818	>	unlockRoot();
2819	>	}
2820	>	}
2821	>	break;
2822	>	}
2823	>	}
2824	>	assert checkInvariants(root);
2825	>	return null;
2826	>	}
2827
2828	<	/**
2829	<	* If the specified key is not already associated
2830	<	* with a value, associate it with the given value.
2831	<	* Otherwise, replace the value with the results of
2832	<	* the given remapping function. This is equivalent to:
2833	<	*  <pre> {@code
2834	<	*   if (!map.containsKey(key))
2835	<	*     map.put(value);
2836	<	*   else {
2837	<	*     newValue = remappingFunction.apply(map.get(key), value);
2838	<	*     if (value != null)
2839	<	*       map.put(key, value);
2840	<	*     else
2841	<	*       map.remove(key);
2842	<	*   }
2843	<	* }</pre>
2844	<	* except that the action is performed atomically.  If the
2845	<	* function returns {@code null}, the mapping is removed.  If the
2846	<	* function itself throws an (unchecked) exception, the exception
2847	<	* is rethrown to its caller, and the current mapping is left
2848	<	* unchanged.  Some attempted update operations on this map by
2849	<	* other threads may be blocked while computation is in progress,
2850	<	* so the computation should be short and simple, and must not
2851	<	* attempt to update any other mappings of this Map.
2852	<	*/
2853	<	public V merge
2854	<	(K key, V value,
2855	<	BiFun<? super V, ? super V, ? extends V> remappingFunction) {
2856	<	return internalMerge(key, value, remappingFunction);
2857	<	}
2828	>	/**
2829	>	* Removes the given node, that must be present before this
2830	>	* call.  This is messier than typical red-black deletion code
2831	>	* because we cannot swap the contents of an interior node
2832	>	* with a leaf successor that is pinned by "next" pointers
2833	>	* that are accessible independently of lock. So instead we
2834	>	* swap the tree linkages.
2835	>	*
2836	>	* @return true if now too small, so should be untreeified
2837	>	*/
2838	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2839	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2840	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2841	>	TreeNode<K,V> r, rl;
2842	>	if (pred == null)
2843	>	first = next;
2844	>	else
2845	>	pred.next = next;
2846	>	if (next != null)
2847	>	next.prev = pred;
2848	>	if (first == null) {
2849	>	root = null;
2850	>	return true;
2851	>	}
2852	>	if ((r = root) == null || r.right == null || // too small
2853	>	(rl = r.left) == null || rl.left == null)
2854	>	return true;
2855	>	lockRoot();
2856	>	try {
2857	>	TreeNode<K,V> replacement;
2858	>	TreeNode<K,V> pl = p.left;
2859	>	TreeNode<K,V> pr = p.right;
2860	>	if (pl != null && pr != null) {
2861	>	TreeNode<K,V> s = pr, sl;
2862	>	while ((sl = s.left) != null) // find successor
2863	>	s = sl;
2864	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2865	>	TreeNode<K,V> sr = s.right;
2866	>	TreeNode<K,V> pp = p.parent;
2867	>	if (s == pr) { // p was s's direct parent
2868	>	p.parent = s;
2869	>	s.right = p;
2870	>	}
2871	>	else {
2872	>	TreeNode<K,V> sp = s.parent;
2873	>	if ((p.parent = sp) != null) {
2874	>	if (s == sp.left)
2875	>	sp.left = p;
2876	>	else
2877	>	sp.right = p;
2878	>	}
2879	>	if ((s.right = pr) != null)
2880	>	pr.parent = s;
2881	>	}
2882	>	p.left = null;
2883	>	if ((p.right = sr) != null)
2884	>	sr.parent = p;
2885	>	if ((s.left = pl) != null)
2886	>	pl.parent = s;
2887	>	if ((s.parent = pp) == null)
2888	>	r = s;
2889	>	else if (p == pp.left)
2890	>	pp.left = s;
2891	>	else
2892	>	pp.right = s;
2893	>	if (sr != null)
2894	>	replacement = sr;
2895	>	else
2896	>	replacement = p;
2897	>	}
2898	>	else if (pl != null)
2899	>	replacement = pl;
2900	>	else if (pr != null)
2901	>	replacement = pr;
2902	>	else
2903	>	replacement = p;
2904	>	if (replacement != p) {
2905	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2906	>	if (pp == null)
2907	>	r = replacement;
2908	>	else if (p == pp.left)
2909	>	pp.left = replacement;
2910	>	else
2911	>	pp.right = replacement;
2912	>	p.left = p.right = p.parent = null;
2913	>	}
2914
2915	<	/**
2816	<	* Removes the key (and its corresponding value) from this map.
2817	<	* This method does nothing if the key is not in the map.
2818	<	*
2819	<	* @param  key the key that needs to be removed
2820	<	* @return the previous value associated with {@code key}, or
2821	<	*         {@code null} if there was no mapping for {@code key}
2822	<	* @throws NullPointerException if the specified key is null
2823	<	*/
2824	<	public V remove(Object key) {
2825	<	return internalReplace(key, null, null);
2826	<	}
2915	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2916
2917	<	/**
2918	<	* {@inheritDoc}
2919	<	*
2920	<	* @throws NullPointerException if the specified key is null
2921	<	*/
2922	<	public boolean remove(Object key, Object value) {
2923	<	return value != null && internalReplace(key, null, value) != null;
2924	<	}
2917	>	if (p == replacement) {  // detach pointers
2918	>	TreeNode<K,V> pp;
2919	>	if ((pp = p.parent) != null) {
2920	>	if (p == pp.left)
2921	>	pp.left = null;
2922	>	else if (p == pp.right)
2923	>	pp.right = null;
2924	>	p.parent = null;
2925	>	}
2926	>	}
2927	>	} finally {
2928	>	unlockRoot();
2929	>	}
2930	>	assert checkInvariants(root);
2931	>	return false;
2932	>	}
2933
2934	<	/**
2935	<	* {@inheritDoc}
2839	<	*
2840	<	* @throws NullPointerException if any of the arguments are null
2841	<	*/
2842	<	public boolean replace(K key, V oldValue, V newValue) {
2843	<	if (key == null || oldValue == null || newValue == null)
2844	<	throw new NullPointerException();
2845	<	return internalReplace(key, newValue, oldValue) != null;
2846	<	}
2934	>	/* ------------------------------------------------------------ */
2935	>	// Red-black tree methods, all adapted from CLR
2936
2937	<	/**
2938	<	* {@inheritDoc}
2939	<	*
2940	<	* @return the previous value associated with the specified key,
2941	<	*         or {@code null} if there was no mapping for the key
2942	<	* @throws NullPointerException if the specified key or value is null
2943	<	*/
2944	<	public V replace(K key, V value) {
2945	<	if (key == null || value == null)
2946	<	throw new NullPointerException();
2947	<	return internalReplace(key, value, null);
2948	<	}
2937	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2938	>	TreeNode<K,V> p) {
2939	>	TreeNode<K,V> r, pp, rl;
2940	>	if (p != null && (r = p.right) != null) {
2941	>	if ((rl = p.right = r.left) != null)
2942	>	rl.parent = p;
2943	>	if ((pp = r.parent = p.parent) == null)
2944	>	(root = r).red = false;
2945	>	else if (pp.left == p)
2946	>	pp.left = r;
2947	>	else
2948	>	pp.right = r;
2949	>	r.left = p;
2950	>	p.parent = r;
2951	>	}
2952	>	return root;
2953	>	}
2954
2955	<	/**
2956	<	* Removes all of the mappings from this map.
2957	<	*/
2958	<	public void clear() {
2959	<	internalClear();
2960	<	}
2955	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2956	>	TreeNode<K,V> p) {
2957	>	TreeNode<K,V> l, pp, lr;
2958	>	if (p != null && (l = p.left) != null) {
2959	>	if ((lr = p.left = l.right) != null)
2960	>	lr.parent = p;
2961	>	if ((pp = l.parent = p.parent) == null)
2962	>	(root = l).red = false;
2963	>	else if (pp.right == p)
2964	>	pp.right = l;
2965	>	else
2966	>	pp.left = l;
2967	>	l.right = p;
2968	>	p.parent = l;
2969	>	}
2970	>	return root;
2971	>	}
2972
2973	<	/**
2974	<	* Returns a {@link Set} view of the keys contained in this map.
2975	<	* The set is backed by the map, so changes to the map are
2976	<	* reflected in the set, and vice-versa.
2977	<	*
2978	<	* @return the set view
2979	<	*/
2980	<	public KeySetView<K,V> keySet() {
2981	<	KeySetView<K,V> ks = keySet;
2982	<	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2983	<	}
2973	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2974	>	TreeNode<K,V> x) {
2975	>	x.red = true;
2976	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2977	>	if ((xp = x.parent) == null) {
2978	>	x.red = false;
2979	>	return x;
2980	>	}
2981	>	else if (!xp.red || (xpp = xp.parent) == null)
2982	>	return root;
2983	>	if (xp == (xppl = xpp.left)) {
2984	>	if ((xppr = xpp.right) != null && xppr.red) {
2985	>	xppr.red = false;
2986	>	xp.red = false;
2987	>	xpp.red = true;
2988	>	x = xpp;
2989	>	}
2990	>	else {
2991	>	if (x == xp.right) {
2992	>	root = rotateLeft(root, x = xp);
2993	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2994	>	}
2995	>	if (xp != null) {
2996	>	xp.red = false;
2997	>	if (xpp != null) {
2998	>	xpp.red = true;
2999	>	root = rotateRight(root, xpp);
3000	>	}
3001	>	}
3002	>	}
3003	>	}
3004	>	else {
3005	>	if (xppl != null && xppl.red) {
3006	>	xppl.red = false;
3007	>	xp.red = false;
3008	>	xpp.red = true;
3009	>	x = xpp;
3010	>	}
3011	>	else {
3012	>	if (x == xp.left) {
3013	>	root = rotateRight(root, x = xp);
3014	>	xpp = (xp = x.parent) == null ? null : xp.parent;
3015	>	}
3016	>	if (xp != null) {
3017	>	xp.red = false;
3018	>	if (xpp != null) {
3019	>	xpp.red = true;
3020	>	root = rotateLeft(root, xpp);
3021	>	}
3022	>	}
3023	>	}
3024	>	}
3025	>	}
3026	>	}
3027
3028	<	/**
3029	<	* Returns a {@link Set} view of the keys in this map, using the
3030	<	* given common mapped value for any additions (i.e., {@link
3031	<	* Collection#add} and {@link Collection#addAll}). This is of
3032	<	* course only appropriate if it is acceptable to use the same
3033	<	* value for all additions from this view.
3034	<	*
3035	<	* @param mappedValue the mapped value to use for any
3036	<	* additions.
3037	<	* @return the set view
3038	<	* @throws NullPointerException if the mappedValue is null
3039	<	*/
3040	<	public KeySetView<K,V> keySet(V mappedValue) {
3041	<	if (mappedValue == null)
3042	<	throw new NullPointerException();
3043	<	return new KeySetView<K,V>(this, mappedValue);
3044	<	}
3028	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
3029	>	TreeNode<K,V> x) {
3030	>	for (TreeNode<K,V> xp, xpl, xpr;;)  {
3031	>	if (x == null || x == root)
3032	>	return root;
3033	>	else if ((xp = x.parent) == null) {
3034	>	x.red = false;
3035	>	return x;
3036	>	}
3037	>	else if (x.red) {
3038	>	x.red = false;
3039	>	return root;
3040	>	}
3041	>	else if ((xpl = xp.left) == x) {
3042	>	if ((xpr = xp.right) != null && xpr.red) {
3043	>	xpr.red = false;
3044	>	xp.red = true;
3045	>	root = rotateLeft(root, xp);
3046	>	xpr = (xp = x.parent) == null ? null : xp.right;
3047	>	}
3048	>	if (xpr == null)
3049	>	x = xp;
3050	>	else {
3051	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
3052	>	if ((sr == null || !sr.red) &&
3053	>	(sl == null || !sl.red)) {
3054	>	xpr.red = true;
3055	>	x = xp;
3056	>	}
3057	>	else {
3058	>	if (sr == null || !sr.red) {
3059	>	if (sl != null)
3060	>	sl.red = false;
3061	>	xpr.red = true;
3062	>	root = rotateRight(root, xpr);
3063	>	xpr = (xp = x.parent) == null ?
3064	>	null : xp.right;
3065	>	}
3066	>	if (xpr != null) {
3067	>	xpr.red = (xp == null) ? false : xp.red;
3068	>	if ((sr = xpr.right) != null)
3069	>	sr.red = false;
3070	>	}
3071	>	if (xp != null) {
3072	>	xp.red = false;
3073	>	root = rotateLeft(root, xp);
3074	>	}
3075	>	x = root;
3076	>	}
3077	>	}
3078	>	}
3079	>	else { // symmetric
3080	>	if (xpl != null && xpl.red) {
3081	>	xpl.red = false;
3082	>	xp.red = true;
3083	>	root = rotateRight(root, xp);
3084	>	xpl = (xp = x.parent) == null ? null : xp.left;
3085	>	}
3086	>	if (xpl == null)
3087	>	x = xp;
3088	>	else {
3089	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3090	>	if ((sl == null || !sl.red) &&
3091	>	(sr == null || !sr.red)) {
3092	>	xpl.red = true;
3093	>	x = xp;
3094	>	}
3095	>	else {
3096	>	if (sl == null || !sl.red) {
3097	>	if (sr != null)
3098	>	sr.red = false;
3099	>	xpl.red = true;
3100	>	root = rotateLeft(root, xpl);
3101	>	xpl = (xp = x.parent) == null ?
3102	>	null : xp.left;
3103	>	}
3104	>	if (xpl != null) {
3105	>	xpl.red = (xp == null) ? false : xp.red;
3106	>	if ((sl = xpl.left) != null)
3107	>	sl.red = false;
3108	>	}
3109	>	if (xp != null) {
3110	>	xp.red = false;
3111	>	root = rotateRight(root, xp);
3112	>	}
3113	>	x = root;
3114	>	}
3115	>	}
3116	>	}
3117	>	}
3118	>	}
3119
3120	<	/**
3121	<	* Returns a {@link Collection} view of the values contained in this map.
3122	<	* The collection is backed by the map, so changes to the map are
3123	<	* reflected in the collection, and vice-versa.
3124	<	*/
3125	<	public ValuesView<K,V> values() {
3126	<	ValuesView<K,V> vs = values;
3127	<	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
3128	<	}
3120	>	/**
3121	>	* Recursive invariant check
3122	>	*/
3123	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3124	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3125	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3126	>	if (tb != null && tb.next != t)
3127	>	return false;
3128	>	if (tn != null && tn.prev != t)
3129	>	return false;
3130	>	if (tp != null && t != tp.left && t != tp.right)
3131	>	return false;
3132	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3133	>	return false;
3134	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3135	>	return false;
3136	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3137	>	return false;
3138	>	if (tl != null && !checkInvariants(tl))
3139	>	return false;
3140	>	if (tr != null && !checkInvariants(tr))
3141	>	return false;
3142	>	return true;
3143	>	}
3144
3145	<	/**
3146	<	* Returns a {@link Set} view of the mappings contained in this map.
3147	<	* The set is backed by the map, so changes to the map are
3148	<	* reflected in the set, and vice-versa.  The set supports element
3149	<	* removal, which removes the corresponding mapping from the map,
3150	<	* via the {@code Iterator.remove}, {@code Set.remove},
3151	<	* {@code removeAll}, {@code retainAll}, and {@code clear}
3152	<	* operations.  It does not support the {@code add} or
3153	<	* {@code addAll} operations.
3154	<	*
3155	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
3156	<	* that will never throw {@link ConcurrentModificationException},
2920	<	* and guarantees to traverse elements as they existed upon
2921	<	* construction of the iterator, and may (but is not guaranteed to)
2922	<	* reflect any modifications subsequent to construction.
2923	<	*/
2924	<	public Set<Map.Entry<K,V>> entrySet() {
2925	<	EntrySetView<K,V> es = entrySet;
2926	<	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
3145	>	private static final sun.misc.Unsafe U;
3146	>	private static final long LOCKSTATE;
3147	>	static {
3148	>	try {
3149	>	U = getUnsafe();
3150	>	Class<?> k = TreeBin.class;
3151	>	LOCKSTATE = U.objectFieldOffset
3152	>	(k.getDeclaredField("lockState"));
3153	>	} catch (Exception e) {
3154	>	throw new Error(e);
3155	>	}
3156	>	}
3157		}
3158
3159	<	/**
2930	<	* Returns an enumeration of the keys in this table.
2931	<	*
2932	<	* @return an enumeration of the keys in this table
2933	<	* @see #keySet()
2934	<	*/
2935	<	public Enumeration<K> keys() {
2936	<	return new KeyIterator<K,V>(this);
2937	<	}
3159	>	/* ----------------Table Traversal -------------- */
3160
3161		/**
3162	<	* Returns an enumeration of the values in this table.
3163	<	*
3164	<	* @return an enumeration of the values in this table
3165	<	* @see #values()
3166	<	*/
3167	<	public Enumeration<V> elements() {
3168	<	return new ValueIterator<K,V>(this);
3162	>	* Records the table, its length, and current traversal index for a
3163	>	* traverser that must process a region of a forwarded table before
3164	>	* proceeding with current table.
3165	>	*/
3166	>	static final class TableStack<K,V> {
3167	>	int length;
3168	>	int index;
3169	>	Node<K,V>[] tab;
3170	>	TableStack<K,V> next;
3171		}
3172
3173		/**
3174	<	* Returns a partitionable iterator of the keys in this map.
3174	>	* Encapsulates traversal for methods such as containsValue; also
3175	>	* serves as a base class for other iterators and spliterators.
3176		*
3177	<	* @return a partitionable iterator of the keys in this map
3178	<	*/
3179	<	public Spliterator<K> keySpliterator() {
3180	<	return new KeyIterator<K,V>(this);
3181	<	}
3182	<
3183	<	/**
3184	<	* Returns a partitionable iterator of the values in this map.
3177	>	* Method advance visits once each still-valid node that was
3178	>	* reachable upon iterator construction. It might miss some that
3179	>	* were added to a bin after the bin was visited, which is OK wrt
3180	>	* consistency guarantees. Maintaining this property in the face
3181	>	* of possible ongoing resizes requires a fair amount of
3182	>	* bookkeeping state that is difficult to optimize away amidst
3183	>	* volatile accesses.  Even so, traversal maintains reasonable
3184	>	* throughput.
3185		*
3186	<	* @return a partitionable iterator of the values in this map
3186	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3187	>	* However, if the table has been resized, then all future steps
3188	>	* must traverse both the bin at the current index as well as at
3189	>	* (index + baseSize); and so on for further resizings. To
3190	>	* paranoically cope with potential sharing by users of iterators
3191	>	* across threads, iteration terminates if a bounds checks fails
3192	>	* for a table read.
3193		*/
3194	<	public Spliterator<V> valueSpliterator() {
3195	<	return new ValueIterator<K,V>(this);
3196	<	}
3194	>	static class Traverser<K,V> {
3195	>	Node<K,V>[] tab;        // current table; updated if resized
3196	>	Node<K,V> next;         // the next entry to use
3197	>	TableStack<K,V> stack, spare; // to save/restore on ForwardingNodes
3198	>	int index;              // index of bin to use next
3199	>	int baseIndex;          // current index of initial table
3200	>	int baseLimit;          // index bound for initial table
3201	>	final int baseSize;     // initial table size
3202	>
3203	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3204	>	this.tab = tab;
3205	>	this.baseSize = size;
3206	>	this.baseIndex = this.index = index;
3207	>	this.baseLimit = limit;
3208	>	this.next = null;
3209	>	}
3210
3211	<	/**
3212	<	* Returns a partitionable iterator of the entries in this map.
3213	<	*
3214	<	* @return a partitionable iterator of the entries in this map
3215	<	*/
3216	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
3217	<	return new EntryIterator<K,V>(this);
3218	<	}
3211	>	/**
3212	>	* Advances if possible, returning next valid node, or null if none.
3213	>	*/
3214	>	final Node<K,V> advance() {
3215	>	Node<K,V> e;
3216	>	if ((e = next) != null)
3217	>	e = e.next;
3218	>	for (;;) {
3219	>	Node<K,V>[] t; int i, n;  // must use locals in checks
3220	>	if (e != null)
3221	>	return next = e;
3222	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3223	>	(n = t.length) <= (i = index) || i < 0)
3224	>	return next = null;
3225	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
3226	>	if (e instanceof ForwardingNode) {
3227	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3228	>	e = null;
3229	>	pushState(t, i, n);
3230	>	continue;
3231	>	}
3232	>	else if (e instanceof TreeBin)
3233	>	e = ((TreeBin<K,V>)e).first;
3234	>	else
3235	>	e = null;
3236	>	}
3237	>	if (stack != null)
3238	>	recoverState(n);
3239	>	else if ((index = i + baseSize) >= n)
3240	>	index = ++baseIndex; // visit upper slots if present
3241	>	}
3242	>	}
3243
3244	<	/**
3245	<	* Returns the hash code value for this {@link Map}, i.e.,
3246	<	* the sum of, for each key-value pair in the map,
3247	<	* {@code key.hashCode() ^ value.hashCode()}.
3248	<	*
3249	<	* @return the hash code value for this map
3250	<	*/
3251	<	public int hashCode() {
3252	<	int h = 0;
3253	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3254	<	Object v;
3255	<	while ((v = it.advance()) != null) {
3256	<	h += it.nextKey.hashCode() ^ v.hashCode();
3244	>	/**
3245	>	* Saves traversal state upon encountering a forwarding node.
3246	>	*/
3247	>	private void pushState(Node<K,V>[] t, int i, int n) {
3248	>	TableStack<K,V> s = spare;  // reuse if possible
3249	>	if (s != null)
3250	>	spare = s.next;
3251	>	else
3252	>	s = new TableStack<K,V>();
3253	>	s.tab = t;
3254	>	s.length = n;
3255	>	s.index = i;
3256	>	s.next = stack;
3257	>	stack = s;
3258		}
2990	–	return h;
2991	–	}
3259
3260	<	/**
3261	<	* Returns a string representation of this map.  The string
3262	<	* representation consists of a list of key-value mappings (in no
3263	<	* particular order) enclosed in braces ("{@code {}}").  Adjacent
3264	<	* mappings are separated by the characters {@code ", "} (comma
3265	<	* and space).  Each key-value mapping is rendered as the key
3266	<	* followed by an equals sign ("{@code =}") followed by the
3267	<	* associated value.
3268	<	*
3269	<	* @return a string representation of this map
3270	<	*/
3271	<	public String toString() {
3272	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3273	<	StringBuilder sb = new StringBuilder();
3274	<	sb.append('{');
3275	<	Object v;
3009	<	if ((v = it.advance()) != null) {
3010	<	for (;;) {
3011	<	Object k = it.nextKey;
3012	<	sb.append(k == this ? "(this Map)" : k);
3013	<	sb.append('=');
3014	<	sb.append(v == this ? "(this Map)" : v);
3015	<	if ((v = it.advance()) == null)
3016	<	break;
3017	<	sb.append(',').append(' ');
3260	>	/**
3261	>	* Possibly pops traversal state.
3262	>	*
3263	>	* @param n length of current table
3264	>	*/
3265	>	private void recoverState(int n) {
3266	>	TableStack<K,V> s; int len;
3267	>	while ((s = stack) != null && (index += (len = s.length)) >= n) {
3268	>	n = len;
3269	>	index = s.index;
3270	>	tab = s.tab;
3271	>	s.tab = null;
3272	>	TableStack<K,V> next = s.next;
3273	>	s.next = spare; // save for reuse
3274	>	stack = next;
3275	>	spare = s;
3276		}
3277	+	if (s == null && (index += baseSize) >= n)
3278	+	index = ++baseIndex;
3279		}
3020	–	return sb.append('}').toString();
3280		}
3281
3282		/**
3283	<	* Compares the specified object with this map for equality.
3284	<	* Returns {@code true} if the given object is a map with the same
3026	<	* mappings as this map.  This operation may return misleading
3027	<	* results if either map is concurrently modified during execution
3028	<	* of this method.
3029	<	*
3030	<	* @param o object to be compared for equality with this map
3031	<	* @return {@code true} if the specified object is equal to this map
3283	>	* Base of key, value, and entry Iterators. Adds fields to
3284	>	* Traverser to support iterator.remove.
3285		*/
3286	<	public boolean equals(Object o) {
3287	<	if (o != this) {
3288	<	if (!(o instanceof Map))
3289	<	return false;
3290	<	Map<?,?> m = (Map<?,?>) o;
3291	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3292	<	Object val;
3293	<	while ((val = it.advance()) != null) {
3041	<	Object v = m.get(it.nextKey);
3042	<	if (v == null || (v != val && !v.equals(val)))
3043	<	return false;
3044	<	}
3045	<	for (Map.Entry<?,?> e : m.entrySet()) {
3046	<	Object mk, mv, v;
3047	<	if ((mk = e.getKey()) == null ||
3048	<	(mv = e.getValue()) == null ||
3049	<	(v = internalGet(mk)) == null ||
3050	<	(mv != v && !mv.equals(v)))
3051	<	return false;
3052	<	}
3286	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3287	>	final ConcurrentHashMapV8<K,V> map;
3288	>	Node<K,V> lastReturned;
3289	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3290	>	ConcurrentHashMapV8<K,V> map) {
3291	>	super(tab, size, index, limit);
3292	>	this.map = map;
3293	>	advance();
3294		}
3054	–	return true;
3055	–	}
3295
3296	<	/* ----------------Iterators -------------- */
3296	>	public final boolean hasNext() { return next != null; }
3297	>	public final boolean hasMoreElements() { return next != null; }
3298
3299	<	@SuppressWarnings("serial") static final class KeyIterator<K,V>
3300	<	extends Traverser<K,V,Object>
3301	<	implements Spliterator<K>, Enumeration<K> {
3062	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3063	<	KeyIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3064	<	super(map, it, -1);
3065	<	}
3066	<	public KeyIterator<K,V> split() {
3067	<	if (nextKey != null)
3299	>	public final void remove() {
3300	>	Node<K,V> p;
3301	>	if ((p = lastReturned) == null)
3302		throw new IllegalStateException();
3303	<	return new KeyIterator<K,V>(map, this);
3303	>	lastReturned = null;
3304	>	map.replaceNode(p.key, null, null);
3305		}
3306	<	@SuppressWarnings("unchecked") public final K next() {
3307	<	if (nextVal == null && advance() == null)
3306	>	}
3307	>
3308	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3309	>	implements Iterator<K>, Enumeration<K> {
3310	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3311	>	ConcurrentHashMapV8<K,V> map) {
3312	>	super(tab, index, size, limit, map);
3313	>	}
3314	>
3315	>	public final K next() {
3316	>	Node<K,V> p;
3317	>	if ((p = next) == null)
3318		throw new NoSuchElementException();
3319	<	Object k = nextKey;
3320	<	nextVal = null;
3321	<	return (K) k;
3319	>	K k = p.key;
3320	>	lastReturned = p;
3321	>	advance();
3322	>	return k;
3323		}
3324
3325		public final K nextElement() { return next(); }
3326		}
3327
3328	<	@SuppressWarnings("serial") static final class ValueIterator<K,V>
3329	<	extends Traverser<K,V,Object>
3330	<	implements Spliterator<V>, Enumeration<V> {
3331	<	ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3332	<	ValueIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3087	<	super(map, it, -1);
3088	<	}
3089	<	public ValueIterator<K,V> split() {
3090	<	if (nextKey != null)
3091	<	throw new IllegalStateException();
3092	<	return new ValueIterator<K,V>(map, this);
3328	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3329	>	implements Iterator<V>, Enumeration<V> {
3330	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3331	>	ConcurrentHashMapV8<K,V> map) {
3332	>	super(tab, index, size, limit, map);
3333		}
3334
3335	<	@SuppressWarnings("unchecked") public final V next() {
3336	<	Object v;
3337	<	if ((v = nextVal) == null && (v = advance()) == null)
3335	>	public final V next() {
3336	>	Node<K,V> p;
3337	>	if ((p = next) == null)
3338		throw new NoSuchElementException();
3339	<	nextVal = null;
3340	<	return (V) v;
3339	>	V v = p.val;
3340	>	lastReturned = p;
3341	>	advance();
3342	>	return v;
3343		}
3344
3345		public final V nextElement() { return next(); }
3346		}
3347
3348	<	@SuppressWarnings("serial") static final class EntryIterator<K,V>
3349	<	extends Traverser<K,V,Object>
3350	<	implements Spliterator<Map.Entry<K,V>> {
3351	<	EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3352	<	EntryIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3111	<	super(map, it, -1);
3112	<	}
3113	<	public EntryIterator<K,V> split() {
3114	<	if (nextKey != null)
3115	<	throw new IllegalStateException();
3116	<	return new EntryIterator<K,V>(map, this);
3348	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3349	>	implements Iterator<Map.Entry<K,V>> {
3350	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3351	>	ConcurrentHashMapV8<K,V> map) {
3352	>	super(tab, index, size, limit, map);
3353		}
3354
3355	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3356	<	Object v;
3357	<	if ((v = nextVal) == null && (v = advance()) == null)
3355	>	public final Map.Entry<K,V> next() {
3356	>	Node<K,V> p;
3357	>	if ((p = next) == null)
3358		throw new NoSuchElementException();
3359	<	Object k = nextKey;
3360	<	nextVal = null;
3361	<	return new MapEntry<K,V>((K)k, (V)v, map);
3359	>	K k = p.key;
3360	>	V v = p.val;
3361	>	lastReturned = p;
3362	>	advance();
3363	>	return new MapEntry<K,V>(k, v, map);
3364		}
3365		}
3366
3367		/**
3368	<	* Exported Entry for iterators
3368	>	* Exported Entry for EntryIterator
3369		*/
3370	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3370	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3371		final K key; // non-null
3372		V val;       // non-null
3373	<	final ConcurrentHashMapV8<K, V> map;
3374	<	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3373	>	final ConcurrentHashMapV8<K,V> map;
3374	>	MapEntry(K key, V val, ConcurrentHashMapV8<K,V> map) {
3375		this.key = key;
3376		this.val = val;
3377		this.map = map;
3378		}
3379	<	public final K getKey()       { return key; }
3380	<	public final V getValue()     { return val; }
3381	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3382	<	public final String toString(){ return key + "=" + val; }
3379	>	public K getKey()        { return key; }
3380	>	public V getValue()      { return val; }
3381	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3382	>	public String toString() { return key + "=" + val; }
3383
3384	<	public final boolean equals(Object o) {
3384	>	public boolean equals(Object o) {
3385		Object k, v; Map.Entry<?,?> e;
3386		return ((o instanceof Map.Entry) &&
3387		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3157 | Line 3395 | public class ConcurrentHashMapV8<K, V>
3395		* value to return is somewhat arbitrary here. Since we do not
3396		* necessarily track asynchronous changes, the most recent
3397		* "previous" value could be different from what we return (or
3398	<	* could even have been removed in which case the put will
3398	>	* could even have been removed, in which case the put will
3399		* re-establish). We do not and cannot guarantee more.
3400		*/
3401	<	public final V setValue(V value) {
3401	>	public V setValue(V value) {
3402		if (value == null) throw new NullPointerException();
3403		V v = val;
3404		val = value;
#	Line 3169 | Line 3407 | public class ConcurrentHashMapV8<K, V>
3407		}
3408		}
3409
3410	<	/**
3411	<	* Returns exportable snapshot entry for the given key and value
3412	<	* when write-through can't or shouldn't be used.
3413	<	*/
3414	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
3415	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
3416	<	}
3410	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3411	>	implements ConcurrentHashMapSpliterator<K> {
3412	>	long est;               // size estimate
3413	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3414	>	long est) {
3415	>	super(tab, size, index, limit);
3416	>	this.est = est;
3417	>	}
3418	>
3419	>	public ConcurrentHashMapSpliterator<K> trySplit() {
3420	>	int i, f, h;
3421	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3422	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3423	>	f, est >>>= 1);
3424	>	}
3425
3426	<	/* ---------------- Serialization Support -------------- */
3426	>	public void forEachRemaining(Action<? super K> action) {
3427	>	if (action == null) throw new NullPointerException();
3428	>	for (Node<K,V> p; (p = advance()) != null;)
3429	>	action.apply(p.key);
3430	>	}
3431	>
3432	>	public boolean tryAdvance(Action<? super K> action) {
3433	>	if (action == null) throw new NullPointerException();
3434	>	Node<K,V> p;
3435	>	if ((p = advance()) == null)
3436	>	return false;
3437	>	action.apply(p.key);
3438	>	return true;
3439	>	}
3440	>
3441	>	public long estimateSize() { return est; }
3442
3182	–	/**
3183	–	* Stripped-down version of helper class used in previous version,
3184	–	* declared for the sake of serialization compatibility
3185	–	*/
3186	–	static class Segment<K,V> implements Serializable {
3187	–	private static final long serialVersionUID = 2249069246763182397L;
3188	–	final float loadFactor;
3189	–	Segment(float lf) { this.loadFactor = lf; }
3443		}
3444
3445	<	/**
3446	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
3447	<	* stream (i.e., serializes it).
3448	<	* @param s the stream
3449	<	* @serialData
3450	<	* the key (Object) and value (Object)
3451	<	* for each key-value mapping, followed by a null pair.
3199	<	* The key-value mappings are emitted in no particular order.
3200	<	*/
3201	<	@SuppressWarnings("unchecked") private void writeObject
3202	<	(java.io.ObjectOutputStream s)
3203	<	throws java.io.IOException {
3204	<	if (segments == null) { // for serialization compatibility
3205	<	segments = (Segment<K,V>[])
3206	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
3207	<	for (int i = 0; i < segments.length; ++i)
3208	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
3209	<	}
3210	<	s.defaultWriteObject();
3211	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3212	<	Object v;
3213	<	while ((v = it.advance()) != null) {
3214	<	s.writeObject(it.nextKey);
3215	<	s.writeObject(v);
3445	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3446	>	implements ConcurrentHashMapSpliterator<V> {
3447	>	long est;               // size estimate
3448	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3449	>	long est) {
3450	>	super(tab, size, index, limit);
3451	>	this.est = est;
3452		}
3217	–	s.writeObject(null);
3218	–	s.writeObject(null);
3219	–	segments = null; // throw away
3220	–	}
3453
3454	<	/**
3455	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3456	<	* @param s the stream
3457	<	*/
3458	<	@SuppressWarnings("unchecked") private void readObject
3459	<	(java.io.ObjectInputStream s)
3228	<	throws java.io.IOException, ClassNotFoundException {
3229	<	s.defaultReadObject();
3230	<	this.segments = null; // unneeded
3454	>	public ConcurrentHashMapSpliterator<V> trySplit() {
3455	>	int i, f, h;
3456	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3457	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3458	>	f, est >>>= 1);
3459	>	}
3460
3461	<	// Create all nodes, then place in table once size is known
3462	<	long size = 0L;
3463	<	Node p = null;
3464	<	for (;;) {
3236	<	K k = (K) s.readObject();
3237	<	V v = (V) s.readObject();
3238	<	if (k != null && v != null) {
3239	<	int h = spread(k.hashCode());
3240	<	p = new Node(h, k, v, p);
3241	<	++size;
3242	<	}
3243	<	else
3244	<	break;
3461	>	public void forEachRemaining(Action<? super V> action) {
3462	>	if (action == null) throw new NullPointerException();
3463	>	for (Node<K,V> p; (p = advance()) != null;)
3464	>	action.apply(p.val);
3465		}
3466	<	if (p != null) {
3467	<	boolean init = false;
3468	<	int n;
3469	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3470	<	n = MAXIMUM_CAPACITY;
3471	<	else {
3472	<	int sz = (int)size;
3473	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
3254	<	}
3255	<	int sc = sizeCtl;
3256	<	boolean collide = false;
3257	<	if (n > sc &&
3258	<	U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
3259	<	try {
3260	<	if (table == null) {
3261	<	init = true;
3262	<	Node[] tab = new Node[n];
3263	<	int mask = n - 1;
3264	<	while (p != null) {
3265	<	int j = p.hash & mask;
3266	<	Node next = p.next;
3267	<	Node q = p.next = tabAt(tab, j);
3268	<	setTabAt(tab, j, p);
3269	<	if (!collide && q != null && q.hash == p.hash)
3270	<	collide = true;
3271	<	p = next;
3272	<	}
3273	<	table = tab;
3274	<	addCount(size, -1);
3275	<	sc = n - (n >>> 2);
3276	<	}
3277	<	} finally {
3278	<	sizeCtl = sc;
3279	<	}
3280	<	if (collide) { // rescan and convert to TreeBins
3281	<	Node[] tab = table;
3282	<	for (int i = 0; i < tab.length; ++i) {
3283	<	int c = 0;
3284	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
3285	<	if (++c > TREE_THRESHOLD &&
3286	<	(e.key instanceof Comparable)) {
3287	<	replaceWithTreeBin(tab, i, e.key);
3288	<	break;
3289	<	}
3290	<	}
3291	<	}
3292	<	}
3293	<	}
3294	<	if (!init) { // Can only happen if unsafely published.
3295	<	while (p != null) {
3296	<	internalPut((K)p.key, (V)p.val, false);
3297	<	p = p.next;
3298	<	}
3299	<	}
3466	>
3467	>	public boolean tryAdvance(Action<? super V> action) {
3468	>	if (action == null) throw new NullPointerException();
3469	>	Node<K,V> p;
3470	>	if ((p = advance()) == null)
3471	>	return false;
3472	>	action.apply(p.val);
3473	>	return true;
3474		}
3475	+
3476	+	public long estimateSize() { return est; }
3477	+
3478		}
3479
3480	<	// -------------------------------------------------------
3480	>	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3481	>	implements ConcurrentHashMapSpliterator<Map.Entry<K,V>> {
3482	>	final ConcurrentHashMapV8<K,V> map; // To export MapEntry
3483	>	long est;               // size estimate
3484	>	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3485	>	long est, ConcurrentHashMapV8<K,V> map) {
3486	>	super(tab, size, index, limit);
3487	>	this.map = map;
3488	>	this.est = est;
3489	>	}
3490
3491	<	// Sams
3492	<	/** Interface describing a void action of one argument */
3493	<	public interface Action<A> { void apply(A a); }
3494	<	/** Interface describing a void action of two arguments */
3495	<	public interface BiAction<A,B> { void apply(A a, B b); }
3496	<	/** Interface describing a function of one argument */
3311	<	public interface Fun<A,T> { T apply(A a); }
3312	<	/** Interface describing a function of two arguments */
3313	<	public interface BiFun<A,B,T> { T apply(A a, B b); }
3314	<	/** Interface describing a function of no arguments */
3315	<	public interface Generator<T> { T apply(); }
3316	<	/** Interface describing a function mapping its argument to a double */
3317	<	public interface ObjectToDouble<A> { double apply(A a); }
3318	<	/** Interface describing a function mapping its argument to a long */
3319	<	public interface ObjectToLong<A> { long apply(A a); }
3320	<	/** Interface describing a function mapping its argument to an int */
3321	<	public interface ObjectToInt<A> {int apply(A a); }
3322	<	/** Interface describing a function mapping two arguments to a double */
3323	<	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
3324	<	/** Interface describing a function mapping two arguments to a long */
3325	<	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
3326	<	/** Interface describing a function mapping two arguments to an int */
3327	<	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
3328	<	/** Interface describing a function mapping a double to a double */
3329	<	public interface DoubleToDouble { double apply(double a); }
3330	<	/** Interface describing a function mapping a long to a long */
3331	<	public interface LongToLong { long apply(long a); }
3332	<	/** Interface describing a function mapping an int to an int */
3333	<	public interface IntToInt { int apply(int a); }
3334	<	/** Interface describing a function mapping two doubles to a double */
3335	<	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3336	<	/** Interface describing a function mapping two longs to a long */
3337	<	public interface LongByLongToLong { long apply(long a, long b); }
3338	<	/** Interface describing a function mapping two ints to an int */
3339	<	public interface IntByIntToInt { int apply(int a, int b); }
3491	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> trySplit() {
3492	>	int i, f, h;
3493	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3494	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3495	>	f, est >>>= 1, map);
3496	>	}
3497
3498	+	public void forEachRemaining(Action<? super Map.Entry<K,V>> action) {
3499	+	if (action == null) throw new NullPointerException();
3500	+	for (Node<K,V> p; (p = advance()) != null; )
3501	+	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3502	+	}
3503
3504	<	// -------------------------------------------------------
3504	>	public boolean tryAdvance(Action<? super Map.Entry<K,V>> action) {
3505	>	if (action == null) throw new NullPointerException();
3506	>	Node<K,V> p;
3507	>	if ((p = advance()) == null)
3508	>	return false;
3509	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3510	>	return true;
3511	>	}
3512	>
3513	>	public long estimateSize() { return est; }
3514	>
3515	>	}
3516	>
3517	>	// Parallel bulk operations
3518	>
3519	>	/**
3520	>	* Computes initial batch value for bulk tasks. The returned value
3521	>	* is approximately exp2 of the number of times (minus one) to
3522	>	* split task by two before executing leaf action. This value is
3523	>	* faster to compute and more convenient to use as a guide to
3524	>	* splitting than is the depth, since it is used while dividing by
3525	>	* two anyway.
3526	>	*/
3527	>	final int batchFor(long b) {
3528	>	long n;
3529	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3530	>	return 0;
3531	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3532	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3533	>	}
3534
3535		/**
3536		* Performs the given action for each (key, value).
3537		*
3538	+	* @param parallelismThreshold the (estimated) number of elements
3539	+	* needed for this operation to be executed in parallel
3540		* @param action the action
3541	+	* @since 1.8
3542		*/
3543	<	public void forEach(BiAction<K,V> action) {
3544	<	ForkJoinTasks.forEach
3545	<	(this, action).invoke();
3543	>	public void forEach(long parallelismThreshold,
3544	>	BiAction<? super K,? super V> action) {
3545	>	if (action == null) throw new NullPointerException();
3546	>	new ForEachMappingTask<K,V>
3547	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3548	>	action).invoke();
3549		}
3550
3551		/**
3552		* Performs the given action for each non-null transformation
3553		* of each (key, value).
3554		*
3555	+	* @param parallelismThreshold the (estimated) number of elements
3556	+	* needed for this operation to be executed in parallel
3557		* @param transformer a function returning the transformation
3558	<	* for an element, or null of there is no transformation (in
3559	<	* which case the action is not applied).
3558	>	* for an element, or null if there is no transformation (in
3559	>	* which case the action is not applied)
3560		* @param action the action
3561	+	* @since 1.8
3562		*/
3563	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3564	<	Action<U> action) {
3565	<	ForkJoinTasks.forEach
3566	<	(this, transformer, action).invoke();
3563	>	public <U> void forEach(long parallelismThreshold,
3564	>	BiFun<? super K, ? super V, ? extends U> transformer,
3565	>	Action<? super U> action) {
3566	>	if (transformer == null || action == null)
3567	>	throw new NullPointerException();
3568	>	new ForEachTransformedMappingTask<K,V,U>
3569	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3570	>	transformer, action).invoke();
3571		}
3572
3573		/**
#	Line 3373 | Line 3577 | public class ConcurrentHashMapV8<K, V>
3577		* results of any other parallel invocations of the search
3578		* function are ignored.
3579		*
3580	+	* @param parallelismThreshold the (estimated) number of elements
3581	+	* needed for this operation to be executed in parallel
3582		* @param searchFunction a function returning a non-null
3583		* result on success, else null
3584		* @return a non-null result from applying the given search
3585		* function on each (key, value), or null if none
3586	+	* @since 1.8
3587		*/
3588	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3589	<	return ForkJoinTasks.search
3590	<	(this, searchFunction).invoke();
3588	>	public <U> U search(long parallelismThreshold,
3589	>	BiFun<? super K, ? super V, ? extends U> searchFunction) {
3590	>	if (searchFunction == null) throw new NullPointerException();
3591	>	return new SearchMappingsTask<K,V,U>
3592	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3593	>	searchFunction, new AtomicReference<U>()).invoke();
3594		}
3595
3596		/**
#	Line 3388 | Line 3598 | public class ConcurrentHashMapV8<K, V>
3598		* of all (key, value) pairs using the given reducer to
3599		* combine values, or null if none.
3600		*
3601	+	* @param parallelismThreshold the (estimated) number of elements
3602	+	* needed for this operation to be executed in parallel
3603		* @param transformer a function returning the transformation
3604	<	* for an element, or null of there is no transformation (in
3605	<	* which case it is not combined).
3604	>	* for an element, or null if there is no transformation (in
3605	>	* which case it is not combined)
3606		* @param reducer a commutative associative combining function
3607		* @return the result of accumulating the given transformation
3608		* of all (key, value) pairs
3609	+	* @since 1.8
3610		*/
3611	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3611	>	public <U> U reduce(long parallelismThreshold,
3612	>	BiFun<? super K, ? super V, ? extends U> transformer,
3613		BiFun<? super U, ? super U, ? extends U> reducer) {
3614	<	return ForkJoinTasks.reduce
3615	<	(this, transformer, reducer).invoke();
3614	>	if (transformer == null || reducer == null)
3615	>	throw new NullPointerException();
3616	>	return new MapReduceMappingsTask<K,V,U>
3617	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3618	>	null, transformer, reducer).invoke();
3619		}
3620
3621		/**
#	Line 3406 | Line 3623 | public class ConcurrentHashMapV8<K, V>
3623		* of all (key, value) pairs using the given reducer to
3624		* combine values, and the given basis as an identity value.
3625		*
3626	+	* @param parallelismThreshold the (estimated) number of elements
3627	+	* needed for this operation to be executed in parallel
3628		* @param transformer a function returning the transformation
3629		* for an element
3630		* @param basis the identity (initial default value) for the reduction
3631		* @param reducer a commutative associative combining function
3632		* @return the result of accumulating the given transformation
3633		* of all (key, value) pairs
3634	+	* @since 1.8
3635		*/
3636	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3636	>	public double reduceToDouble(long parallelismThreshold,
3637	>	ObjectByObjectToDouble<? super K, ? super V> transformer,
3638		double basis,
3639		DoubleByDoubleToDouble reducer) {
3640	<	return ForkJoinTasks.reduceToDouble
3641	<	(this, transformer, basis, reducer).invoke();
3640	>	if (transformer == null || reducer == null)
3641	>	throw new NullPointerException();
3642	>	return new MapReduceMappingsToDoubleTask<K,V>
3643	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3644	>	null, transformer, basis, reducer).invoke();
3645		}
3646
3647		/**
#	Line 3425 | Line 3649 | public class ConcurrentHashMapV8<K, V>
3649		* of all (key, value) pairs using the given reducer to
3650		* combine values, and the given basis as an identity value.
3651		*
3652	+	* @param parallelismThreshold the (estimated) number of elements
3653	+	* needed for this operation to be executed in parallel
3654		* @param transformer a function returning the transformation
3655		* for an element
3656		* @param basis the identity (initial default value) for the reduction
3657		* @param reducer a commutative associative combining function
3658		* @return the result of accumulating the given transformation
3659		* of all (key, value) pairs
3660	+	* @since 1.8
3661		*/
3662	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3662	>	public long reduceToLong(long parallelismThreshold,
3663	>	ObjectByObjectToLong<? super K, ? super V> transformer,
3664		long basis,
3665		LongByLongToLong reducer) {
3666	<	return ForkJoinTasks.reduceToLong
3667	<	(this, transformer, basis, reducer).invoke();
3666	>	if (transformer == null || reducer == null)
3667	>	throw new NullPointerException();
3668	>	return new MapReduceMappingsToLongTask<K,V>
3669	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3670	>	null, transformer, basis, reducer).invoke();
3671		}
3672
3673		/**
#	Line 3444 | Line 3675 | public class ConcurrentHashMapV8<K, V>
3675		* of all (key, value) pairs using the given reducer to
3676		* combine values, and the given basis as an identity value.
3677		*
3678	+	* @param parallelismThreshold the (estimated) number of elements
3679	+	* needed for this operation to be executed in parallel
3680		* @param transformer a function returning the transformation
3681		* for an element
3682		* @param basis the identity (initial default value) for the reduction
3683		* @param reducer a commutative associative combining function
3684		* @return the result of accumulating the given transformation
3685		* of all (key, value) pairs
3686	+	* @since 1.8
3687		*/
3688	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3688	>	public int reduceToInt(long parallelismThreshold,
3689	>	ObjectByObjectToInt<? super K, ? super V> transformer,
3690		int basis,
3691		IntByIntToInt reducer) {
3692	<	return ForkJoinTasks.reduceToInt
3693	<	(this, transformer, basis, reducer).invoke();
3692	>	if (transformer == null || reducer == null)
3693	>	throw new NullPointerException();
3694	>	return new MapReduceMappingsToIntTask<K,V>
3695	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3696	>	null, transformer, basis, reducer).invoke();
3697		}
3698
3699		/**
3700		* Performs the given action for each key.
3701		*
3702	+	* @param parallelismThreshold the (estimated) number of elements
3703	+	* needed for this operation to be executed in parallel
3704		* @param action the action
3705	+	* @since 1.8
3706		*/
3707	<	public void forEachKey(Action<K> action) {
3708	<	ForkJoinTasks.forEachKey
3709	<	(this, action).invoke();
3707	>	public void forEachKey(long parallelismThreshold,
3708	>	Action<? super K> action) {
3709	>	if (action == null) throw new NullPointerException();
3710	>	new ForEachKeyTask<K,V>
3711	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3712	>	action).invoke();
3713		}
3714
3715		/**
3716		* Performs the given action for each non-null transformation
3717		* of each key.
3718		*
3719	+	* @param parallelismThreshold the (estimated) number of elements
3720	+	* needed for this operation to be executed in parallel
3721		* @param transformer a function returning the transformation
3722	<	* for an element, or null of there is no transformation (in
3723	<	* which case the action is not applied).
3722	>	* for an element, or null if there is no transformation (in
3723	>	* which case the action is not applied)
3724		* @param action the action
3725	+	* @since 1.8
3726		*/
3727	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3728	<	Action<U> action) {
3729	<	ForkJoinTasks.forEachKey
3730	<	(this, transformer, action).invoke();
3727	>	public <U> void forEachKey(long parallelismThreshold,
3728	>	Fun<? super K, ? extends U> transformer,
3729	>	Action<? super U> action) {
3730	>	if (transformer == null || action == null)
3731	>	throw new NullPointerException();
3732	>	new ForEachTransformedKeyTask<K,V,U>
3733	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3734	>	transformer, action).invoke();
3735		}
3736
3737		/**
#	Line 3490 | Line 3741 | public class ConcurrentHashMapV8<K, V>
3741		* any other parallel invocations of the search function are
3742		* ignored.
3743		*
3744	+	* @param parallelismThreshold the (estimated) number of elements
3745	+	* needed for this operation to be executed in parallel
3746		* @param searchFunction a function returning a non-null
3747		* result on success, else null
3748		* @return a non-null result from applying the given search
3749		* function on each key, or null if none
3750	+	* @since 1.8
3751		*/
3752	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3753	<	return ForkJoinTasks.searchKeys
3754	<	(this, searchFunction).invoke();
3752	>	public <U> U searchKeys(long parallelismThreshold,
3753	>	Fun<? super K, ? extends U> searchFunction) {
3754	>	if (searchFunction == null) throw new NullPointerException();
3755	>	return new SearchKeysTask<K,V,U>
3756	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3757	>	searchFunction, new AtomicReference<U>()).invoke();
3758		}
3759
3760		/**
3761		* Returns the result of accumulating all keys using the given
3762		* reducer to combine values, or null if none.
3763		*
3764	+	* @param parallelismThreshold the (estimated) number of elements
3765	+	* needed for this operation to be executed in parallel
3766		* @param reducer a commutative associative combining function
3767		* @return the result of accumulating all keys using the given
3768		* reducer to combine values, or null if none
3769	+	* @since 1.8
3770		*/
3771	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3772	<	return ForkJoinTasks.reduceKeys
3773	<	(this, reducer).invoke();
3771	>	public K reduceKeys(long parallelismThreshold,
3772	>	BiFun<? super K, ? super K, ? extends K> reducer) {
3773	>	if (reducer == null) throw new NullPointerException();
3774	>	return new ReduceKeysTask<K,V>
3775	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3776	>	null, reducer).invoke();
3777		}
3778
3779		/**
#	Line 3518 | Line 3781 | public class ConcurrentHashMapV8<K, V>
3781		* of all keys using the given reducer to combine values, or
3782		* null if none.
3783		*
3784	+	* @param parallelismThreshold the (estimated) number of elements
3785	+	* needed for this operation to be executed in parallel
3786		* @param transformer a function returning the transformation
3787	<	* for an element, or null of there is no transformation (in
3788	<	* which case it is not combined).
3787	>	* for an element, or null if there is no transformation (in
3788	>	* which case it is not combined)
3789		* @param reducer a commutative associative combining function
3790		* @return the result of accumulating the given transformation
3791		* of all keys
3792	+	* @since 1.8
3793		*/
3794	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3795	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3796	<	return ForkJoinTasks.reduceKeys
3797	<	(this, transformer, reducer).invoke();
3794	>	public <U> U reduceKeys(long parallelismThreshold,
3795	>	Fun<? super K, ? extends U> transformer,
3796	>	BiFun<? super U, ? super U, ? extends U> reducer) {
3797	>	if (transformer == null || reducer == null)
3798	>	throw new NullPointerException();
3799	>	return new MapReduceKeysTask<K,V,U>
3800	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3801	>	null, transformer, reducer).invoke();
3802		}
3803
3804		/**
#	Line 3536 | Line 3806 | public class ConcurrentHashMapV8<K, V>
3806		* of all keys using the given reducer to combine values, and
3807		* the given basis as an identity value.
3808		*
3809	+	* @param parallelismThreshold the (estimated) number of elements
3810	+	* needed for this operation to be executed in parallel
3811		* @param transformer a function returning the transformation
3812		* for an element
3813		* @param basis the identity (initial default value) for the reduction
3814		* @param reducer a commutative associative combining function
3815	<	* @return  the result of accumulating the given transformation
3815	>	* @return the result of accumulating the given transformation
3816		* of all keys
3817	+	* @since 1.8
3818		*/
3819	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3819	>	public double reduceKeysToDouble(long parallelismThreshold,
3820	>	ObjectToDouble<? super K> transformer,
3821		double basis,
3822		DoubleByDoubleToDouble reducer) {
3823	<	return ForkJoinTasks.reduceKeysToDouble
3824	<	(this, transformer, basis, reducer).invoke();
3823	>	if (transformer == null || reducer == null)
3824	>	throw new NullPointerException();
3825	>	return new MapReduceKeysToDoubleTask<K,V>
3826	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3827	>	null, transformer, basis, reducer).invoke();
3828		}
3829
3830		/**
#	Line 3555 | Line 3832 | public class ConcurrentHashMapV8<K, V>
3832		* of all keys using the given reducer to combine values, and
3833		* the given basis as an identity value.
3834		*
3835	+	* @param parallelismThreshold the (estimated) number of elements
3836	+	* needed for this operation to be executed in parallel
3837		* @param transformer a function returning the transformation
3838		* for an element
3839		* @param basis the identity (initial default value) for the reduction
3840		* @param reducer a commutative associative combining function
3841		* @return the result of accumulating the given transformation
3842		* of all keys
3843	+	* @since 1.8
3844		*/
3845	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3845	>	public long reduceKeysToLong(long parallelismThreshold,
3846	>	ObjectToLong<? super K> transformer,
3847		long basis,
3848		LongByLongToLong reducer) {
3849	<	return ForkJoinTasks.reduceKeysToLong
3850	<	(this, transformer, basis, reducer).invoke();
3849	>	if (transformer == null || reducer == null)
3850	>	throw new NullPointerException();
3851	>	return new MapReduceKeysToLongTask<K,V>
3852	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3853	>	null, transformer, basis, reducer).invoke();
3854		}
3855
3856		/**
#	Line 3574 | Line 3858 | public class ConcurrentHashMapV8<K, V>
3858		* of all keys using the given reducer to combine values, and
3859		* the given basis as an identity value.
3860		*
3861	+	* @param parallelismThreshold the (estimated) number of elements
3862	+	* needed for this operation to be executed in parallel
3863		* @param transformer a function returning the transformation
3864		* for an element
3865		* @param basis the identity (initial default value) for the reduction
3866		* @param reducer a commutative associative combining function
3867		* @return the result of accumulating the given transformation
3868		* of all keys
3869	+	* @since 1.8
3870		*/
3871	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3871	>	public int reduceKeysToInt(long parallelismThreshold,
3872	>	ObjectToInt<? super K> transformer,
3873		int basis,
3874		IntByIntToInt reducer) {
3875	<	return ForkJoinTasks.reduceKeysToInt
3876	<	(this, transformer, basis, reducer).invoke();
3875	>	if (transformer == null || reducer == null)
3876	>	throw new NullPointerException();
3877	>	return new MapReduceKeysToIntTask<K,V>
3878	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3879	>	null, transformer, basis, reducer).invoke();
3880		}
3881
3882		/**
3883		* Performs the given action for each value.
3884		*
3885	+	* @param parallelismThreshold the (estimated) number of elements
3886	+	* needed for this operation to be executed in parallel
3887		* @param action the action
3888	+	* @since 1.8
3889		*/
3890	<	public void forEachValue(Action<V> action) {
3891	<	ForkJoinTasks.forEachValue
3892	<	(this, action).invoke();
3890	>	public void forEachValue(long parallelismThreshold,
3891	>	Action<? super V> action) {
3892	>	if (action == null)
3893	>	throw new NullPointerException();
3894	>	new ForEachValueTask<K,V>
3895	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3896	>	action).invoke();
3897		}
3898
3899		/**
3900		* Performs the given action for each non-null transformation
3901		* of each value.
3902		*
3903	+	* @param parallelismThreshold the (estimated) number of elements
3904	+	* needed for this operation to be executed in parallel
3905		* @param transformer a function returning the transformation
3906	<	* for an element, or null of there is no transformation (in
3907	<	* which case the action is not applied).
3906	>	* for an element, or null if there is no transformation (in
3907	>	* which case the action is not applied)
3908	>	* @param action the action
3909	>	* @since 1.8
3910		*/
3911	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3912	<	Action<U> action) {
3913	<	ForkJoinTasks.forEachValue
3914	<	(this, transformer, action).invoke();
3911	>	public <U> void forEachValue(long parallelismThreshold,
3912	>	Fun<? super V, ? extends U> transformer,
3913	>	Action<? super U> action) {
3914	>	if (transformer == null || action == null)
3915	>	throw new NullPointerException();
3916	>	new ForEachTransformedValueTask<K,V,U>
3917	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3918	>	transformer, action).invoke();
3919		}
3920
3921		/**
#	Line 3619 | Line 3925 | public class ConcurrentHashMapV8<K, V>
3925		* any other parallel invocations of the search function are
3926		* ignored.
3927		*
3928	+	* @param parallelismThreshold the (estimated) number of elements
3929	+	* needed for this operation to be executed in parallel
3930		* @param searchFunction a function returning a non-null
3931		* result on success, else null
3932		* @return a non-null result from applying the given search
3933		* function on each value, or null if none
3934	<	*
3934	>	* @since 1.8
3935		*/
3936	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3937	<	return ForkJoinTasks.searchValues
3938	<	(this, searchFunction).invoke();
3936	>	public <U> U searchValues(long parallelismThreshold,
3937	>	Fun<? super V, ? extends U> searchFunction) {
3938	>	if (searchFunction == null) throw new NullPointerException();
3939	>	return new SearchValuesTask<K,V,U>
3940	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3941	>	searchFunction, new AtomicReference<U>()).invoke();
3942		}
3943
3944		/**
3945		* Returns the result of accumulating all values using the
3946		* given reducer to combine values, or null if none.
3947		*
3948	+	* @param parallelismThreshold the (estimated) number of elements
3949	+	* needed for this operation to be executed in parallel
3950		* @param reducer a commutative associative combining function
3951	<	* @return  the result of accumulating all values
3951	>	* @return the result of accumulating all values
3952	>	* @since 1.8
3953		*/
3954	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3955	<	return ForkJoinTasks.reduceValues
3956	<	(this, reducer).invoke();
3954	>	public V reduceValues(long parallelismThreshold,
3955	>	BiFun<? super V, ? super V, ? extends V> reducer) {
3956	>	if (reducer == null) throw new NullPointerException();
3957	>	return new ReduceValuesTask<K,V>
3958	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3959	>	null, reducer).invoke();
3960		}
3961
3962		/**
#	Line 3647 | Line 3964 | public class ConcurrentHashMapV8<K, V>
3964		* of all values using the given reducer to combine values, or
3965		* null if none.
3966		*
3967	+	* @param parallelismThreshold the (estimated) number of elements
3968	+	* needed for this operation to be executed in parallel
3969		* @param transformer a function returning the transformation
3970	<	* for an element, or null of there is no transformation (in
3971	<	* which case it is not combined).
3970	>	* for an element, or null if there is no transformation (in
3971	>	* which case it is not combined)
3972		* @param reducer a commutative associative combining function
3973		* @return the result of accumulating the given transformation
3974		* of all values
3975	+	* @since 1.8
3976		*/
3977	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3977	>	public <U> U reduceValues(long parallelismThreshold,
3978	>	Fun<? super V, ? extends U> transformer,
3979		BiFun<? super U, ? super U, ? extends U> reducer) {
3980	<	return ForkJoinTasks.reduceValues
3981	<	(this, transformer, reducer).invoke();
3980	>	if (transformer == null || reducer == null)
3981	>	throw new NullPointerException();
3982	>	return new MapReduceValuesTask<K,V,U>
3983	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3984	>	null, transformer, reducer).invoke();
3985		}
3986
3987		/**
#	Line 3665 | Line 3989 | public class ConcurrentHashMapV8<K, V>
3989		* of all values using the given reducer to combine values,
3990		* and the given basis as an identity value.
3991		*
3992	+	* @param parallelismThreshold the (estimated) number of elements
3993	+	* needed for this operation to be executed in parallel
3994		* @param transformer a function returning the transformation
3995		* for an element
3996		* @param basis the identity (initial default value) for the reduction
3997		* @param reducer a commutative associative combining function
3998		* @return the result of accumulating the given transformation
3999		* of all values
4000	+	* @since 1.8
4001		*/
4002	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
4002	>	public double reduceValuesToDouble(long parallelismThreshold,
4003	>	ObjectToDouble<? super V> transformer,
4004		double basis,
4005		DoubleByDoubleToDouble reducer) {
4006	<	return ForkJoinTasks.reduceValuesToDouble
4007	<	(this, transformer, basis, reducer).invoke();
4006	>	if (transformer == null || reducer == null)
4007	>	throw new NullPointerException();
4008	>	return new MapReduceValuesToDoubleTask<K,V>
4009	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4010	>	null, transformer, basis, reducer).invoke();
4011		}
4012
4013		/**
#	Line 3684 | Line 4015 | public class ConcurrentHashMapV8<K, V>
4015		* of all values using the given reducer to combine values,
4016		* and the given basis as an identity value.
4017		*
4018	+	* @param parallelismThreshold the (estimated) number of elements
4019	+	* needed for this operation to be executed in parallel
4020		* @param transformer a function returning the transformation
4021		* for an element
4022		* @param basis the identity (initial default value) for the reduction
4023		* @param reducer a commutative associative combining function
4024		* @return the result of accumulating the given transformation
4025		* of all values
4026	+	* @since 1.8
4027		*/
4028	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
4028	>	public long reduceValuesToLong(long parallelismThreshold,
4029	>	ObjectToLong<? super V> transformer,
4030		long basis,
4031		LongByLongToLong reducer) {
4032	<	return ForkJoinTasks.reduceValuesToLong
4033	<	(this, transformer, basis, reducer).invoke();
4032	>	if (transformer == null || reducer == null)
4033	>	throw new NullPointerException();
4034	>	return new MapReduceValuesToLongTask<K,V>
4035	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4036	>	null, transformer, basis, reducer).invoke();
4037		}
4038
4039		/**
#	Line 3703 | Line 4041 | public class ConcurrentHashMapV8<K, V>
4041		* of all values using the given reducer to combine values,
4042		* and the given basis as an identity value.
4043		*
4044	+	* @param parallelismThreshold the (estimated) number of elements
4045	+	* needed for this operation to be executed in parallel
4046		* @param transformer a function returning the transformation
4047		* for an element
4048		* @param basis the identity (initial default value) for the reduction
4049		* @param reducer a commutative associative combining function
4050		* @return the result of accumulating the given transformation
4051		* of all values
4052	+	* @since 1.8
4053		*/
4054	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
4054	>	public int reduceValuesToInt(long parallelismThreshold,
4055	>	ObjectToInt<? super V> transformer,
4056		int basis,
4057		IntByIntToInt reducer) {
4058	<	return ForkJoinTasks.reduceValuesToInt
4059	<	(this, transformer, basis, reducer).invoke();
4058	>	if (transformer == null || reducer == null)
4059	>	throw new NullPointerException();
4060	>	return new MapReduceValuesToIntTask<K,V>
4061	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4062	>	null, transformer, basis, reducer).invoke();
4063		}
4064
4065		/**
4066		* Performs the given action for each entry.
4067		*
4068	+	* @param parallelismThreshold the (estimated) number of elements
4069	+	* needed for this operation to be executed in parallel
4070		* @param action the action
4071	+	* @since 1.8
4072		*/
4073	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
4074	<	ForkJoinTasks.forEachEntry
4075	<	(this, action).invoke();
4073	>	public void forEachEntry(long parallelismThreshold,
4074	>	Action<? super Map.Entry<K,V>> action) {
4075	>	if (action == null) throw new NullPointerException();
4076	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
4077	>	action).invoke();
4078		}
4079
4080		/**
4081		* Performs the given action for each non-null transformation
4082		* of each entry.
4083		*
4084	+	* @param parallelismThreshold the (estimated) number of elements
4085	+	* needed for this operation to be executed in parallel
4086		* @param transformer a function returning the transformation
4087	<	* for an element, or null of there is no transformation (in
4088	<	* which case the action is not applied).
4087	>	* for an element, or null if there is no transformation (in
4088	>	* which case the action is not applied)
4089		* @param action the action
4090	+	* @since 1.8
4091		*/
4092	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
4093	<	Action<U> action) {
4094	<	ForkJoinTasks.forEachEntry
4095	<	(this, transformer, action).invoke();
4092	>	public <U> void forEachEntry(long parallelismThreshold,
4093	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4094	>	Action<? super U> action) {
4095	>	if (transformer == null || action == null)
4096	>	throw new NullPointerException();
4097	>	new ForEachTransformedEntryTask<K,V,U>
4098	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4099	>	transformer, action).invoke();
4100		}
4101
4102		/**
#	Line 3749 | Line 4106 | public class ConcurrentHashMapV8<K, V>
4106		* any other parallel invocations of the search function are
4107		* ignored.
4108		*
4109	+	* @param parallelismThreshold the (estimated) number of elements
4110	+	* needed for this operation to be executed in parallel
4111		* @param searchFunction a function returning a non-null
4112		* result on success, else null
4113		* @return a non-null result from applying the given search
4114		* function on each entry, or null if none
4115	+	* @since 1.8
4116		*/
4117	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4118	<	return ForkJoinTasks.searchEntries
4119	<	(this, searchFunction).invoke();
4117	>	public <U> U searchEntries(long parallelismThreshold,
4118	>	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4119	>	if (searchFunction == null) throw new NullPointerException();
4120	>	return new SearchEntriesTask<K,V,U>
4121	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4122	>	searchFunction, new AtomicReference<U>()).invoke();
4123		}
4124
4125		/**
4126		* Returns the result of accumulating all entries using the
4127		* given reducer to combine values, or null if none.
4128		*
4129	+	* @param parallelismThreshold the (estimated) number of elements
4130	+	* needed for this operation to be executed in parallel
4131		* @param reducer a commutative associative combining function
4132		* @return the result of accumulating all entries
4133	+	* @since 1.8
4134		*/
4135	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4136	<	return ForkJoinTasks.reduceEntries
4137	<	(this, reducer).invoke();
4135	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4136	>	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4137	>	if (reducer == null) throw new NullPointerException();
4138	>	return new ReduceEntriesTask<K,V>
4139	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4140	>	null, reducer).invoke();
4141		}
4142
4143		/**
#	Line 3776 | Line 4145 | public class ConcurrentHashMapV8<K, V>
4145		* of all entries using the given reducer to combine values,
4146		* or null if none.
4147		*
4148	+	* @param parallelismThreshold the (estimated) number of elements
4149	+	* needed for this operation to be executed in parallel
4150		* @param transformer a function returning the transformation
4151	<	* for an element, or null of there is no transformation (in
4152	<	* which case it is not combined).
4151	>	* for an element, or null if there is no transformation (in
4152	>	* which case it is not combined)
4153		* @param reducer a commutative associative combining function
4154		* @return the result of accumulating the given transformation
4155		* of all entries
4156	+	* @since 1.8
4157		*/
4158	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4158	>	public <U> U reduceEntries(long parallelismThreshold,
4159	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4160		BiFun<? super U, ? super U, ? extends U> reducer) {
4161	<	return ForkJoinTasks.reduceEntries
4162	<	(this, transformer, reducer).invoke();
4161	>	if (transformer == null || reducer == null)
4162	>	throw new NullPointerException();
4163	>	return new MapReduceEntriesTask<K,V,U>
4164	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4165	>	null, transformer, reducer).invoke();
4166		}
4167
4168		/**
#	Line 3794 | Line 4170 | public class ConcurrentHashMapV8<K, V>
4170		* of all entries using the given reducer to combine values,
4171		* and the given basis as an identity value.
4172		*
4173	+	* @param parallelismThreshold the (estimated) number of elements
4174	+	* needed for this operation to be executed in parallel
4175		* @param transformer a function returning the transformation
4176		* for an element
4177		* @param basis the identity (initial default value) for the reduction
4178		* @param reducer a commutative associative combining function
4179		* @return the result of accumulating the given transformation
4180		* of all entries
4181	+	* @since 1.8
4182		*/
4183	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4183	>	public double reduceEntriesToDouble(long parallelismThreshold,
4184	>	ObjectToDouble<Map.Entry<K,V>> transformer,
4185		double basis,
4186		DoubleByDoubleToDouble reducer) {
4187	<	return ForkJoinTasks.reduceEntriesToDouble
4188	<	(this, transformer, basis, reducer).invoke();
4187	>	if (transformer == null || reducer == null)
4188	>	throw new NullPointerException();
4189	>	return new MapReduceEntriesToDoubleTask<K,V>
4190	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4191	>	null, transformer, basis, reducer).invoke();
4192		}
4193
4194		/**
#	Line 3813 | Line 4196 | public class ConcurrentHashMapV8<K, V>
4196		* of all entries using the given reducer to combine values,
4197		* and the given basis as an identity value.
4198		*
4199	+	* @param parallelismThreshold the (estimated) number of elements
4200	+	* needed for this operation to be executed in parallel
4201		* @param transformer a function returning the transformation
4202		* for an element
4203		* @param basis the identity (initial default value) for the reduction
4204		* @param reducer a commutative associative combining function
4205	<	* @return  the result of accumulating the given transformation
4205	>	* @return the result of accumulating the given transformation
4206		* of all entries
4207	+	* @since 1.8
4208		*/
4209	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4209	>	public long reduceEntriesToLong(long parallelismThreshold,
4210	>	ObjectToLong<Map.Entry<K,V>> transformer,
4211		long basis,
4212		LongByLongToLong reducer) {
4213	<	return ForkJoinTasks.reduceEntriesToLong
4214	<	(this, transformer, basis, reducer).invoke();
4213	>	if (transformer == null || reducer == null)
4214	>	throw new NullPointerException();
4215	>	return new MapReduceEntriesToLongTask<K,V>
4216	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4217	>	null, transformer, basis, reducer).invoke();
4218		}
4219
4220		/**
#	Line 3832 | Line 4222 | public class ConcurrentHashMapV8<K, V>
4222		* of all entries using the given reducer to combine values,
4223		* and the given basis as an identity value.
4224		*
4225	+	* @param parallelismThreshold the (estimated) number of elements
4226	+	* needed for this operation to be executed in parallel
4227		* @param transformer a function returning the transformation
4228		* for an element
4229		* @param basis the identity (initial default value) for the reduction
4230		* @param reducer a commutative associative combining function
4231		* @return the result of accumulating the given transformation
4232		* of all entries
4233	+	* @since 1.8
4234		*/
4235	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4235	>	public int reduceEntriesToInt(long parallelismThreshold,
4236	>	ObjectToInt<Map.Entry<K,V>> transformer,
4237		int basis,
4238		IntByIntToInt reducer) {
4239	<	return ForkJoinTasks.reduceEntriesToInt
4240	<	(this, transformer, basis, reducer).invoke();
4239	>	if (transformer == null || reducer == null)
4240	>	throw new NullPointerException();
4241	>	return new MapReduceEntriesToIntTask<K,V>
4242	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4243	>	null, transformer, basis, reducer).invoke();
4244		}
4245
4246	+
4247		/* ----------------Views -------------- */
4248
4249		/**
4250		* Base class for views.
4251		*/
4252	<	static abstract class CHMView<K, V> {
4253	<	final ConcurrentHashMapV8<K, V> map;
4254	<	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
4252	>	abstract static class CollectionView<K,V,E>
4253	>	implements Collection<E>, java.io.Serializable {
4254	>	private static final long serialVersionUID = 7249069246763182397L;
4255	>	final ConcurrentHashMapV8<K,V> map;
4256	>	CollectionView(ConcurrentHashMapV8<K,V> map)  { this.map = map; }
4257
4258		/**
4259		* Returns the map backing this view.
#	Line 3862 | Line 4262 | public class ConcurrentHashMapV8<K, V>
4262		*/
4263		public ConcurrentHashMapV8<K,V> getMap() { return map; }
4264
4265	<	public final int size()                 { return map.size(); }
4266	<	public final boolean isEmpty()          { return map.isEmpty(); }
4267	<	public final void clear()               { map.clear(); }
4265	>	/**
4266	>	* Removes all of the elements from this view, by removing all
4267	>	* the mappings from the map backing this view.
4268	>	*/
4269	>	public final void clear()      { map.clear(); }
4270	>	public final int size()        { return map.size(); }
4271	>	public final boolean isEmpty() { return map.isEmpty(); }
4272
4273		// implementations below rely on concrete classes supplying these
4274	<	abstract public Iterator<?> iterator();
4275	<	abstract public boolean contains(Object o);
4276	<	abstract public boolean remove(Object o);
4274	>	// abstract methods
4275	>	/**
4276	>	* Returns a "weakly consistent" iterator that will never
4277	>	* throw {@link ConcurrentModificationException}, and
4278	>	* guarantees to traverse elements as they existed upon
4279	>	* construction of the iterator, and may (but is not
4280	>	* guaranteed to) reflect any modifications subsequent to
4281	>	* construction.
4282	>	*/
4283	>	public abstract Iterator<E> iterator();
4284	>	public abstract boolean contains(Object o);
4285	>	public abstract boolean remove(Object o);
4286
4287		private static final String oomeMsg = "Required array size too large";
4288
4289		public final Object[] toArray() {
4290		long sz = map.mappingCount();
4291	<	if (sz > (long)(MAX_ARRAY_SIZE))
4291	>	if (sz > MAX_ARRAY_SIZE)
4292		throw new OutOfMemoryError(oomeMsg);
4293		int n = (int)sz;
4294		Object[] r = new Object[n];
4295		int i = 0;
4296	<	Iterator<?> it = iterator();
3884	<	while (it.hasNext()) {
4296	>	for (E e : this) {
4297		if (i == n) {
4298		if (n >= MAX_ARRAY_SIZE)
4299		throw new OutOfMemoryError(oomeMsg);
#	Line 3891 | Line 4303 | public class ConcurrentHashMapV8<K, V>
4303		n += (n >>> 1) + 1;
4304		r = Arrays.copyOf(r, n);
4305		}
4306	<	r[i++] = it.next();
4306	>	r[i++] = e;
4307		}
4308		return (i == n) ? r : Arrays.copyOf(r, i);
4309		}
4310
4311	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4311	>	@SuppressWarnings("unchecked")
4312	>	public final <T> T[] toArray(T[] a) {
4313		long sz = map.mappingCount();
4314	<	if (sz > (long)(MAX_ARRAY_SIZE))
4314	>	if (sz > MAX_ARRAY_SIZE)
4315		throw new OutOfMemoryError(oomeMsg);
4316		int m = (int)sz;
4317		T[] r = (a.length >= m) ? a :
#	Line 3906 | Line 4319 | public class ConcurrentHashMapV8<K, V>
4319		.newInstance(a.getClass().getComponentType(), m);
4320		int n = r.length;
4321		int i = 0;
4322	<	Iterator<?> it = iterator();
3910	<	while (it.hasNext()) {
4322	>	for (E e : this) {
4323		if (i == n) {
4324		if (n >= MAX_ARRAY_SIZE)
4325		throw new OutOfMemoryError(oomeMsg);
#	Line 3917 | Line 4329 | public class ConcurrentHashMapV8<K, V>
4329		n += (n >>> 1) + 1;
4330		r = Arrays.copyOf(r, n);
4331		}
4332	<	r[i++] = (T)it.next();
4332	>	r[i++] = (T)e;
4333		}
4334		if (a == r && i < n) {
4335		r[i] = null; // null-terminate
#	Line 3926 | Line 4338 | public class ConcurrentHashMapV8<K, V>
4338		return (i == n) ? r : Arrays.copyOf(r, i);
4339		}
4340
4341	<	public final int hashCode() {
4342	<	int h = 0;
4343	<	for (Iterator<?> it = iterator(); it.hasNext();)
4344	<	h += it.next().hashCode();
4345	<	return h;
4346	<	}
4347	<
4341	>	/**
4342	>	* Returns a string representation of this collection.
4343	>	* The string representation consists of the string representations
4344	>	* of the collection's elements in the order they are returned by
4345	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4346	>	* Adjacent elements are separated by the characters {@code ", "}
4347	>	* (comma and space).  Elements are converted to strings as by
4348	>	* {@link String#valueOf(Object)}.
4349	>	*
4350	>	* @return a string representation of this collection
4351	>	*/
4352		public final String toString() {
4353		StringBuilder sb = new StringBuilder();
4354		sb.append('[');
4355	<	Iterator<?> it = iterator();
4355	>	Iterator<E> it = iterator();
4356		if (it.hasNext()) {
4357		for (;;) {
4358		Object e = it.next();
#	Line 3951 | Line 4367 | public class ConcurrentHashMapV8<K, V>
4367
4368		public final boolean containsAll(Collection<?> c) {
4369		if (c != this) {
4370	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
3955	<	Object e = it.next();
4370	>	for (Object e : c) {
4371		if (e == null || !contains(e))
4372		return false;
4373		}
#	Line 3962 | Line 4377 | public class ConcurrentHashMapV8<K, V>
4377
4378		public final boolean removeAll(Collection<?> c) {
4379		boolean modified = false;
4380	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4380	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4381		if (c.contains(it.next())) {
4382		it.remove();
4383		modified = true;
#	Line 3973 | Line 4388 | public class ConcurrentHashMapV8<K, V>
4388
4389		public final boolean retainAll(Collection<?> c) {
4390		boolean modified = false;
4391	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4391	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4392		if (!c.contains(it.next())) {
4393		it.remove();
4394		modified = true;
#	Line 3987 | Line 4402 | public class ConcurrentHashMapV8<K, V>
4402		/**
4403		* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4404		* which additions may optionally be enabled by mapping to a
4405	<	* common value.  This class cannot be directly instantiated. See
4406	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4407	<	* {@link #newKeySet(int)}.
4405	>	* common value.  This class cannot be directly instantiated.
4406	>	* See {@link #keySet() keySet()},
4407	>	* {@link #keySet(Object) keySet(V)},
4408	>	* {@link #newKeySet() newKeySet()},
4409	>	* {@link #newKeySet(int) newKeySet(int)}.
4410	>	*
4411	>	* @since 1.8
4412		*/
4413	<	public static class KeySetView<K,V> extends CHMView<K,V>
4413	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4414		implements Set<K>, java.io.Serializable {
4415		private static final long serialVersionUID = 7249069246763182397L;
4416		private final V value;
4417	<	KeySetView(ConcurrentHashMapV8<K, V> map, V value) {  // non-public
4417	>	KeySetView(ConcurrentHashMapV8<K,V> map, V value) {  // non-public
4418		super(map);
4419		this.value = value;
4420		}
#	Line 4005 | Line 4424 | public class ConcurrentHashMapV8<K, V>
4424		* or {@code null} if additions are not supported.
4425		*
4426		* @return the default mapped value for additions, or {@code null}
4427	<	* if not supported.
4427	>	* if not supported
4428		*/
4429		public V getMappedValue() { return value; }
4430
4431	<	// implement Set API
4432	<
4431	>	/**
4432	>	* {@inheritDoc}
4433	>	* @throws NullPointerException if the specified key is null
4434	>	*/
4435		public boolean contains(Object o) { return map.containsKey(o); }
4015	–	public boolean remove(Object o)   { return map.remove(o) != null; }
4436
4437		/**
4438	<	* Returns a "weakly consistent" iterator that will never
4439	<	* throw {@link ConcurrentModificationException}, and
4440	<	* guarantees to traverse elements as they existed upon
4021	<	* construction of the iterator, and may (but is not
4022	<	* guaranteed to) reflect any modifications subsequent to
4023	<	* construction.
4438	>	* Removes the key from this map view, by removing the key (and its
4439	>	* corresponding value) from the backing map.  This method does
4440	>	* nothing if the key is not in the map.
4441		*
4442	<	* @return an iterator over the keys of this map
4442	>	* @param  o the key to be removed from the backing map
4443	>	* @return {@code true} if the backing map contained the specified key
4444	>	* @throws NullPointerException if the specified key is null
4445	>	*/
4446	>	public boolean remove(Object o) { return map.remove(o) != null; }
4447	>
4448	>	/**
4449	>	* @return an iterator over the keys of the backing map
4450	>	*/
4451	>	public Iterator<K> iterator() {
4452	>	Node<K,V>[] t;
4453	>	ConcurrentHashMapV8<K,V> m = map;
4454	>	int f = (t = m.table) == null ? 0 : t.length;
4455	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4456	>	}
4457	>
4458	>	/**
4459	>	* Adds the specified key to this set view by mapping the key to
4460	>	* the default mapped value in the backing map, if defined.
4461	>	*
4462	>	* @param e key to be added
4463	>	* @return {@code true} if this set changed as a result of the call
4464	>	* @throws NullPointerException if the specified key is null
4465	>	* @throws UnsupportedOperationException if no default mapped value
4466	>	* for additions was provided
4467		*/
4027	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4468		public boolean add(K e) {
4469		V v;
4470		if ((v = value) == null)
4471		throw new UnsupportedOperationException();
4472	<	if (e == null)
4033	<	throw new NullPointerException();
4034	<	return map.internalPut(e, v, true) == null;
4472	>	return map.putVal(e, v, true) == null;
4473		}
4474	+
4475	+	/**
4476	+	* Adds all of the elements in the specified collection to this set,
4477	+	* as if by calling {@link #add} on each one.
4478	+	*
4479	+	* @param c the elements to be inserted into this set
4480	+	* @return {@code true} if this set changed as a result of the call
4481	+	* @throws NullPointerException if the collection or any of its
4482	+	* elements are {@code null}
4483	+	* @throws UnsupportedOperationException if no default mapped value
4484	+	* for additions was provided
4485	+	*/
4486		public boolean addAll(Collection<? extends K> c) {
4487		boolean added = false;
4488		V v;
4489		if ((v = value) == null)
4490		throw new UnsupportedOperationException();
4491		for (K e : c) {
4492	<	if (e == null)
4043	<	throw new NullPointerException();
4044	<	if (map.internalPut(e, v, true) == null)
4492	>	if (map.putVal(e, v, true) == null)
4493		added = true;
4494		}
4495		return added;
4496		}
4497	+
4498	+	public int hashCode() {
4499	+	int h = 0;
4500	+	for (K e : this)
4501	+	h += e.hashCode();
4502	+	return h;
4503	+	}
4504	+
4505		public boolean equals(Object o) {
4506		Set<?> c;
4507		return ((o instanceof Set) &&
#	Line 4053 | Line 4509 | public class ConcurrentHashMapV8<K, V>
4509		(containsAll(c) && c.containsAll(this))));
4510		}
4511
4512	<	/**
4513	<	* Performs the given action for each key.
4514	<	*
4515	<	* @param action the action
4516	<	*/
4517	<	public void forEach(Action<K> action) {
4062	<	ForkJoinTasks.forEachKey
4063	<	(map, action).invoke();
4064	<	}
4065	<
4066	<	/**
4067	<	* Performs the given action for each non-null transformation
4068	<	* of each key.
4069	<	*
4070	<	* @param transformer a function returning the transformation
4071	<	* for an element, or null of there is no transformation (in
4072	<	* which case the action is not applied).
4073	<	* @param action the action
4074	<	*/
4075	<	public <U> void forEach(Fun<? super K, ? extends U> transformer,
4076	<	Action<U> action) {
4077	<	ForkJoinTasks.forEachKey
4078	<	(map, transformer, action).invoke();
4512	>	public ConcurrentHashMapSpliterator<K> spliterator() {
4513	>	Node<K,V>[] t;
4514	>	ConcurrentHashMapV8<K,V> m = map;
4515	>	long n = m.sumCount();
4516	>	int f = (t = m.table) == null ? 0 : t.length;
4517	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4518		}
4519
4520	<	/**
4521	<	* Returns a non-null result from applying the given search
4522	<	* function on each key, or null if none. Upon success,
4523	<	* further element processing is suppressed and the results of
4524	<	* any other parallel invocations of the search function are
4525	<	* ignored.
4526	<	*
4527	<	* @param searchFunction a function returning a non-null
4089	<	* result on success, else null
4090	<	* @return a non-null result from applying the given search
4091	<	* function on each key, or null if none
4092	<	*/
4093	<	public <U> U search(Fun<? super K, ? extends U> searchFunction) {
4094	<	return ForkJoinTasks.searchKeys
4095	<	(map, searchFunction).invoke();
4096	<	}
4097	<
4098	<	/**
4099	<	* Returns the result of accumulating all keys using the given
4100	<	* reducer to combine values, or null if none.
4101	<	*
4102	<	* @param reducer a commutative associative combining function
4103	<	* @return the result of accumulating all keys using the given
4104	<	* reducer to combine values, or null if none
4105	<	*/
4106	<	public K reduce(BiFun<? super K, ? super K, ? extends K> reducer) {
4107	<	return ForkJoinTasks.reduceKeys
4108	<	(map, reducer).invoke();
4109	<	}
4110	<
4111	<	/**
4112	<	* Returns the result of accumulating the given transformation
4113	<	* of all keys using the given reducer to combine values, and
4114	<	* the given basis as an identity value.
4115	<	*
4116	<	* @param transformer a function returning the transformation
4117	<	* for an element
4118	<	* @param basis the identity (initial default value) for the reduction
4119	<	* @param reducer a commutative associative combining function
4120	<	* @return  the result of accumulating the given transformation
4121	<	* of all keys
4122	<	*/
4123	<	public double reduceToDouble(ObjectToDouble<? super K> transformer,
4124	<	double basis,
4125	<	DoubleByDoubleToDouble reducer) {
4126	<	return ForkJoinTasks.reduceKeysToDouble
4127	<	(map, transformer, basis, reducer).invoke();
4128	<	}
4129	<
4130	<	/**
4131	<	* Returns the result of accumulating the given transformation
4132	<	* of all keys using the given reducer to combine values, and
4133	<	* the given basis as an identity value.
4134	<	*
4135	<	* @param transformer a function returning the transformation
4136	<	* for an element
4137	<	* @param basis the identity (initial default value) for the reduction
4138	<	* @param reducer a commutative associative combining function
4139	<	* @return the result of accumulating the given transformation
4140	<	* of all keys
4141	<	*/
4142	<	public long reduceToLong(ObjectToLong<? super K> transformer,
4143	<	long basis,
4144	<	LongByLongToLong reducer) {
4145	<	return ForkJoinTasks.reduceKeysToLong
4146	<	(map, transformer, basis, reducer).invoke();
4147	<	}
4148	<
4149	<	/**
4150	<	* Returns the result of accumulating the given transformation
4151	<	* of all keys using the given reducer to combine values, and
4152	<	* the given basis as an identity value.
4153	<	*
4154	<	* @param transformer a function returning the transformation
4155	<	* for an element
4156	<	* @param basis the identity (initial default value) for the reduction
4157	<	* @param reducer a commutative associative combining function
4158	<	* @return the result of accumulating the given transformation
4159	<	* of all keys
4160	<	*/
4161	<	public int reduceToInt(ObjectToInt<? super K> transformer,
4162	<	int basis,
4163	<	IntByIntToInt reducer) {
4164	<	return ForkJoinTasks.reduceKeysToInt
4165	<	(map, transformer, basis, reducer).invoke();
4520	>	public void forEach(Action<? super K> action) {
4521	>	if (action == null) throw new NullPointerException();
4522	>	Node<K,V>[] t;
4523	>	if ((t = map.table) != null) {
4524	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4525	>	for (Node<K,V> p; (p = it.advance()) != null; )
4526	>	action.apply(p.key);
4527	>	}
4528		}
4167	–
4529		}
4530
4531		/**
4532		* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4533		* values, in which additions are disabled. This class cannot be
4534	<	* directly instantiated. See {@link #values},
4174	<	*
4175	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4176	<	* that will never throw {@link ConcurrentModificationException},
4177	<	* and guarantees to traverse elements as they existed upon
4178	<	* construction of the iterator, and may (but is not guaranteed to)
4179	<	* reflect any modifications subsequent to construction.
4534	>	* directly instantiated. See {@link #values()}.
4535		*/
4536	<	public static final class ValuesView<K,V> extends CHMView<K,V>
4537	<	implements Collection<V> {
4538	<	ValuesView(ConcurrentHashMapV8<K, V> map)   { super(map); }
4539	<	public final boolean contains(Object o) { return map.containsValue(o); }
4536	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4537	>	implements Collection<V>, java.io.Serializable {
4538	>	private static final long serialVersionUID = 2249069246763182397L;
4539	>	ValuesView(ConcurrentHashMapV8<K,V> map) { super(map); }
4540	>	public final boolean contains(Object o) {
4541	>	return map.containsValue(o);
4542	>	}
4543	>
4544		public final boolean remove(Object o) {
4545		if (o != null) {
4546	<	Iterator<V> it = new ValueIterator<K,V>(map);
4188	<	while (it.hasNext()) {
4546	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4547		if (o.equals(it.next())) {
4548		it.remove();
4549		return true;
#	Line 4195 | Line 4553 | public class ConcurrentHashMapV8<K, V>
4553		return false;
4554		}
4555
4198	–	/**
4199	–	* Returns a "weakly consistent" iterator that will never
4200	–	* throw {@link ConcurrentModificationException}, and
4201	–	* guarantees to traverse elements as they existed upon
4202	–	* construction of the iterator, and may (but is not
4203	–	* guaranteed to) reflect any modifications subsequent to
4204	–	* construction.
4205	–	*
4206	–	* @return an iterator over the values of this map
4207	–	*/
4556		public final Iterator<V> iterator() {
4557	<	return new ValueIterator<K,V>(map);
4557	>	ConcurrentHashMapV8<K,V> m = map;
4558	>	Node<K,V>[] t;
4559	>	int f = (t = m.table) == null ? 0 : t.length;
4560	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4561		}
4562	+
4563		public final boolean add(V e) {
4564		throw new UnsupportedOperationException();
4565		}
#	Line 4215 | Line 4567 | public class ConcurrentHashMapV8<K, V>
4567		throw new UnsupportedOperationException();
4568		}
4569
4570	<	/**
4571	<	* Performs the given action for each value.
4572	<	*
4573	<	* @param action the action
4574	<	*/
4575	<	public void forEach(Action<V> action) {
4224	<	ForkJoinTasks.forEachValue
4225	<	(map, action).invoke();
4226	<	}
4227	<
4228	<	/**
4229	<	* Performs the given action for each non-null transformation
4230	<	* of each value.
4231	<	*
4232	<	* @param transformer a function returning the transformation
4233	<	* for an element, or null of there is no transformation (in
4234	<	* which case the action is not applied).
4235	<	*/
4236	<	public <U> void forEach(Fun<? super V, ? extends U> transformer,
4237	<	Action<U> action) {
4238	<	ForkJoinTasks.forEachValue
4239	<	(map, transformer, action).invoke();
4570	>	public ConcurrentHashMapSpliterator<V> spliterator() {
4571	>	Node<K,V>[] t;
4572	>	ConcurrentHashMapV8<K,V> m = map;
4573	>	long n = m.sumCount();
4574	>	int f = (t = m.table) == null ? 0 : t.length;
4575	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4576		}
4577
4578	<	/**
4579	<	* Returns a non-null result from applying the given search
4580	<	* function on each value, or null if none.  Upon success,
4581	<	* further element processing is suppressed and the results of
4582	<	* any other parallel invocations of the search function are
4583	<	* ignored.
4584	<	*
4585	<	* @param searchFunction a function returning a non-null
4250	<	* result on success, else null
4251	<	* @return a non-null result from applying the given search
4252	<	* function on each value, or null if none
4253	<	*
4254	<	*/
4255	<	public <U> U search(Fun<? super V, ? extends U> searchFunction) {
4256	<	return ForkJoinTasks.searchValues
4257	<	(map, searchFunction).invoke();
4258	<	}
4259	<
4260	<	/**
4261	<	* Returns the result of accumulating all values using the
4262	<	* given reducer to combine values, or null if none.
4263	<	*
4264	<	* @param reducer a commutative associative combining function
4265	<	* @return  the result of accumulating all values
4266	<	*/
4267	<	public V reduce(BiFun<? super V, ? super V, ? extends V> reducer) {
4268	<	return ForkJoinTasks.reduceValues
4269	<	(map, reducer).invoke();
4270	<	}
4271	<
4272	<	/**
4273	<	* Returns the result of accumulating the given transformation
4274	<	* of all values using the given reducer to combine values, or
4275	<	* null if none.
4276	<	*
4277	<	* @param transformer a function returning the transformation
4278	<	* for an element, or null of there is no transformation (in
4279	<	* which case it is not combined).
4280	<	* @param reducer a commutative associative combining function
4281	<	* @return the result of accumulating the given transformation
4282	<	* of all values
4283	<	*/
4284	<	public <U> U reduce(Fun<? super V, ? extends U> transformer,
4285	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4286	<	return ForkJoinTasks.reduceValues
4287	<	(map, transformer, reducer).invoke();
4288	<	}
4289	<
4290	<	/**
4291	<	* Returns the result of accumulating the given transformation
4292	<	* of all values using the given reducer to combine values,
4293	<	* and the given basis as an identity value.
4294	<	*
4295	<	* @param transformer a function returning the transformation
4296	<	* for an element
4297	<	* @param basis the identity (initial default value) for the reduction
4298	<	* @param reducer a commutative associative combining function
4299	<	* @return the result of accumulating the given transformation
4300	<	* of all values
4301	<	*/
4302	<	public double reduceToDouble(ObjectToDouble<? super V> transformer,
4303	<	double basis,
4304	<	DoubleByDoubleToDouble reducer) {
4305	<	return ForkJoinTasks.reduceValuesToDouble
4306	<	(map, transformer, basis, reducer).invoke();
4307	<	}
4308	<
4309	<	/**
4310	<	* Returns the result of accumulating the given transformation
4311	<	* of all values using the given reducer to combine values,
4312	<	* and the given basis as an identity value.
4313	<	*
4314	<	* @param transformer a function returning the transformation
4315	<	* for an element
4316	<	* @param basis the identity (initial default value) for the reduction
4317	<	* @param reducer a commutative associative combining function
4318	<	* @return the result of accumulating the given transformation
4319	<	* of all values
4320	<	*/
4321	<	public long reduceToLong(ObjectToLong<? super V> transformer,
4322	<	long basis,
4323	<	LongByLongToLong reducer) {
4324	<	return ForkJoinTasks.reduceValuesToLong
4325	<	(map, transformer, basis, reducer).invoke();
4326	<	}
4327	<
4328	<	/**
4329	<	* Returns the result of accumulating the given transformation
4330	<	* of all values using the given reducer to combine values,
4331	<	* and the given basis as an identity value.
4332	<	*
4333	<	* @param transformer a function returning the transformation
4334	<	* for an element
4335	<	* @param basis the identity (initial default value) for the reduction
4336	<	* @param reducer a commutative associative combining function
4337	<	* @return the result of accumulating the given transformation
4338	<	* of all values
4339	<	*/
4340	<	public int reduceToInt(ObjectToInt<? super V> transformer,
4341	<	int basis,
4342	<	IntByIntToInt reducer) {
4343	<	return ForkJoinTasks.reduceValuesToInt
4344	<	(map, transformer, basis, reducer).invoke();
4578	>	public void forEach(Action<? super V> action) {
4579	>	if (action == null) throw new NullPointerException();
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	>	action.apply(p.val);
4585	>	}
4586		}
4346	–
4587		}
4588
4589		/**
4590		* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4591		* entries.  This class cannot be directly instantiated. See
4592	<	* {@link #entrySet}.
4592	>	* {@link #entrySet()}.
4593		*/
4594	<	public static final class EntrySetView<K,V> extends CHMView<K,V>
4595	<	implements Set<Map.Entry<K,V>> {
4596	<	EntrySetView(ConcurrentHashMapV8<K, V> map) { super(map); }
4597	<	public final boolean contains(Object o) {
4594	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4595	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4596	>	private static final long serialVersionUID = 2249069246763182397L;
4597	>	EntrySetView(ConcurrentHashMapV8<K,V> map) { super(map); }
4598	>
4599	>	public boolean contains(Object o) {
4600		Object k, v, r; Map.Entry<?,?> e;
4601		return ((o instanceof Map.Entry) &&
4602		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4362 | Line 4604 | public class ConcurrentHashMapV8<K, V>
4604		(v = e.getValue()) != null &&
4605		(v == r || v.equals(r)));
4606		}
4607	<	public final boolean remove(Object o) {
4607	>
4608	>	public boolean remove(Object o) {
4609		Object k, v; Map.Entry<?,?> e;
4610		return ((o instanceof Map.Entry) &&
4611		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4371 | Line 4614 | public class ConcurrentHashMapV8<K, V>
4614		}
4615
4616		/**
4617	<	* Returns a "weakly consistent" iterator that will never
4375	<	* throw {@link ConcurrentModificationException}, and
4376	<	* guarantees to traverse elements as they existed upon
4377	<	* construction of the iterator, and may (but is not
4378	<	* guaranteed to) reflect any modifications subsequent to
4379	<	* construction.
4380	<	*
4381	<	* @return an iterator over the entries of this map
4617	>	* @return an iterator over the entries of the backing map
4618		*/
4619	<	public final Iterator<Map.Entry<K,V>> iterator() {
4620	<	return new EntryIterator<K,V>(map);
4619	>	public Iterator<Map.Entry<K,V>> iterator() {
4620	>	ConcurrentHashMapV8<K,V> m = map;
4621	>	Node<K,V>[] t;
4622	>	int f = (t = m.table) == null ? 0 : t.length;
4623	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4624		}
4625
4626	<	public final boolean add(Entry<K,V> e) {
4627	<	K key = e.getKey();
4389	<	V value = e.getValue();
4390	<	if (key == null || value == null)
4391	<	throw new NullPointerException();
4392	<	return map.internalPut(key, value, false) == null;
4626	>	public boolean add(Entry<K,V> e) {
4627	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4628		}
4629	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4629	>
4630	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4631		boolean added = false;
4632		for (Entry<K,V> e : c) {
4633		if (add(e))
#	Line 4399 | Line 4635 | public class ConcurrentHashMapV8<K, V>
4635		}
4636		return added;
4637		}
4638	<	public boolean equals(Object o) {
4638	>
4639	>	public final int hashCode() {
4640	>	int h = 0;
4641	>	Node<K,V>[] t;
4642	>	if ((t = map.table) != null) {
4643	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4644	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4645	>	h += p.hashCode();
4646	>	}
4647	>	}
4648	>	return h;
4649	>	}
4650	>
4651	>	public final boolean equals(Object o) {
4652		Set<?> c;
4653		return ((o instanceof Set) &&
4654		((c = (Set<?>)o) == this ||
4655		(containsAll(c) && c.containsAll(this))));
4656		}
4657
4658	<	/**
4659	<	* Performs the given action for each entry.
4660	<	*
4661	<	* @param action the action
4662	<	*/
4663	<	public void forEach(Action<Map.Entry<K,V>> action) {
4415	<	ForkJoinTasks.forEachEntry
4416	<	(map, action).invoke();
4417	<	}
4418	<
4419	<	/**
4420	<	* Performs the given action for each non-null transformation
4421	<	* of each entry.
4422	<	*
4423	<	* @param transformer a function returning the transformation
4424	<	* for an element, or null of there is no transformation (in
4425	<	* which case the action is not applied).
4426	<	* @param action the action
4427	<	*/
4428	<	public <U> void forEach(Fun<Map.Entry<K,V>, ? extends U> transformer,
4429	<	Action<U> action) {
4430	<	ForkJoinTasks.forEachEntry
4431	<	(map, transformer, action).invoke();
4432	<	}
4433	<
4434	<	/**
4435	<	* Returns a non-null result from applying the given search
4436	<	* function on each entry, or null if none.  Upon success,
4437	<	* further element processing is suppressed and the results of
4438	<	* any other parallel invocations of the search function are
4439	<	* ignored.
4440	<	*
4441	<	* @param searchFunction a function returning a non-null
4442	<	* result on success, else null
4443	<	* @return a non-null result from applying the given search
4444	<	* function on each entry, or null if none
4445	<	*/
4446	<	public <U> U search(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4447	<	return ForkJoinTasks.searchEntries
4448	<	(map, searchFunction).invoke();
4449	<	}
4450	<
4451	<	/**
4452	<	* Returns the result of accumulating all entries using the
4453	<	* given reducer to combine values, or null if none.
4454	<	*
4455	<	* @param reducer a commutative associative combining function
4456	<	* @return the result of accumulating all entries
4457	<	*/
4458	<	public Map.Entry<K,V> reduce(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4459	<	return ForkJoinTasks.reduceEntries
4460	<	(map, reducer).invoke();
4461	<	}
4462	<
4463	<	/**
4464	<	* Returns the result of accumulating the given transformation
4465	<	* of all entries using the given reducer to combine values,
4466	<	* or null if none.
4467	<	*
4468	<	* @param transformer a function returning the transformation
4469	<	* for an element, or null of there is no transformation (in
4470	<	* which case it is not combined).
4471	<	* @param reducer a commutative associative combining function
4472	<	* @return the result of accumulating the given transformation
4473	<	* of all entries
4474	<	*/
4475	<	public <U> U reduce(Fun<Map.Entry<K,V>, ? extends U> transformer,
4476	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4477	<	return ForkJoinTasks.reduceEntries
4478	<	(map, transformer, reducer).invoke();
4658	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> spliterator() {
4659	>	Node<K,V>[] t;
4660	>	ConcurrentHashMapV8<K,V> m = map;
4661	>	long n = m.sumCount();
4662	>	int f = (t = m.table) == null ? 0 : t.length;
4663	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4664		}
4665
4666	<	/**
4667	<	* Returns the result of accumulating the given transformation
4668	<	* of all entries using the given reducer to combine values,
4669	<	* and the given basis as an identity value.
4670	<	*
4671	<	* @param transformer a function returning the transformation
4672	<	* for an element
4673	<	* @param basis the identity (initial default value) for the reduction
4489	<	* @param reducer a commutative associative combining function
4490	<	* @return the result of accumulating the given transformation
4491	<	* of all entries
4492	<	*/
4493	<	public double reduceToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4494	<	double basis,
4495	<	DoubleByDoubleToDouble reducer) {
4496	<	return ForkJoinTasks.reduceEntriesToDouble
4497	<	(map, transformer, basis, reducer).invoke();
4498	<	}
4499	<
4500	<	/**
4501	<	* Returns the result of accumulating the given transformation
4502	<	* of all entries using the given reducer to combine values,
4503	<	* and the given basis as an identity value.
4504	<	*
4505	<	* @param transformer a function returning the transformation
4506	<	* for an element
4507	<	* @param basis the identity (initial default value) for the reduction
4508	<	* @param reducer a commutative associative combining function
4509	<	* @return  the result of accumulating the given transformation
4510	<	* of all entries
4511	<	*/
4512	<	public long reduceToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4513	<	long basis,
4514	<	LongByLongToLong reducer) {
4515	<	return ForkJoinTasks.reduceEntriesToLong
4516	<	(map, transformer, basis, reducer).invoke();
4517	<	}
4518	<
4519	<	/**
4520	<	* Returns the result of accumulating the given transformation
4521	<	* of all entries using the given reducer to combine values,
4522	<	* and the given basis as an identity value.
4523	<	*
4524	<	* @param transformer a function returning the transformation
4525	<	* for an element
4526	<	* @param basis the identity (initial default value) for the reduction
4527	<	* @param reducer a commutative associative combining function
4528	<	* @return the result of accumulating the given transformation
4529	<	* of all entries
4530	<	*/
4531	<	public int reduceToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4532	<	int basis,
4533	<	IntByIntToInt reducer) {
4534	<	return ForkJoinTasks.reduceEntriesToInt
4535	<	(map, transformer, basis, reducer).invoke();
4666	>	public void forEach(Action<? super Map.Entry<K,V>> action) {
4667	>	if (action == null) throw new NullPointerException();
4668	>	Node<K,V>[] t;
4669	>	if ((t = map.table) != null) {
4670	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4671	>	for (Node<K,V> p; (p = it.advance()) != null; )
4672	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
4673	>	}
4674		}
4675
4676		}
4677
4678	<	// ---------------------------------------------------------------------
4678	>	// -------------------------------------------------------
4679
4680		/**
4681	<	* Predefined tasks for performing bulk parallel operations on
4682	<	* ConcurrentHashMapV8s. These tasks follow the forms and rules used
4545	<	* for bulk operations. Each method has the same name, but returns
4546	<	* a task rather than invoking it. These methods may be useful in
4547	<	* custom applications such as submitting a task without waiting
4548	<	* for completion, using a custom pool, or combining with other
4549	<	* tasks.
4681	>	* Base class for bulk tasks. Repeats some fields and code from
4682	>	* class Traverser, because we need to subclass CountedCompleter.
4683		*/
4684	<	public static class ForkJoinTasks {
4685	<	private ForkJoinTasks() {}
4686	<
4687	<	/**
4688	<	* Returns a task that when invoked, performs the given
4689	<	* action for each (key, value)
4690	<	*
4691	<	* @param map the map
4692	<	* @param action the action
4693	<	* @return the task
4694	<	*/
4695	<	public static <K,V> ForkJoinTask<Void> forEach
4696	<	(ConcurrentHashMapV8<K,V> map,
4697	<	BiAction<K,V> action) {
4698	<	if (action == null) throw new NullPointerException();
4699	<	return new ForEachMappingTask<K,V>(map, null, -1, action);
4700	<	}
4701	<
4702	<	/**
4703	<	* Returns a task that when invoked, performs the given
4704	<	* action for each non-null transformation of each (key, value)
4572	<	*
4573	<	* @param map the map
4574	<	* @param transformer a function returning the transformation
4575	<	* for an element, or null if there is no transformation (in
4576	<	* which case the action is not applied)
4577	<	* @param action the action
4578	<	* @return the task
4579	<	*/
4580	<	public static <K,V,U> ForkJoinTask<Void> forEach
4581	<	(ConcurrentHashMapV8<K,V> map,
4582	<	BiFun<? super K, ? super V, ? extends U> transformer,
4583	<	Action<U> action) {
4584	<	if (transformer == null || action == null)
4585	<	throw new NullPointerException();
4586	<	return new ForEachTransformedMappingTask<K,V,U>
4587	<	(map, null, -1, transformer, action);
4588	<	}
4589	<
4590	<	/**
4591	<	* Returns a task that when invoked, returns a non-null result
4592	<	* from applying the given search function on each (key,
4593	<	* value), or null if none. Upon success, further element
4594	<	* processing is suppressed and the results of any other
4595	<	* parallel invocations of the search function are ignored.
4596	<	*
4597	<	* @param map the map
4598	<	* @param searchFunction a function returning a non-null
4599	<	* result on success, else null
4600	<	* @return the task
4601	<	*/
4602	<	public static <K,V,U> ForkJoinTask<U> search
4603	<	(ConcurrentHashMapV8<K,V> map,
4604	<	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4605	<	if (searchFunction == null) throw new NullPointerException();
4606	<	return new SearchMappingsTask<K,V,U>
4607	<	(map, null, -1, searchFunction,
4608	<	new AtomicReference<U>());
4609	<	}
4610	<
4611	<	/**
4612	<	* Returns a task that when invoked, returns the result of
4613	<	* accumulating the given transformation of all (key, value) pairs
4614	<	* using the given reducer to combine values, or null if none.
4615	<	*
4616	<	* @param map the map
4617	<	* @param transformer a function returning the transformation
4618	<	* for an element, or null if there is no transformation (in
4619	<	* which case it is not combined).
4620	<	* @param reducer a commutative associative combining function
4621	<	* @return the task
4622	<	*/
4623	<	public static <K,V,U> ForkJoinTask<U> reduce
4624	<	(ConcurrentHashMapV8<K,V> map,
4625	<	BiFun<? super K, ? super V, ? extends U> transformer,
4626	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4627	<	if (transformer == null || reducer == null)
4628	<	throw new NullPointerException();
4629	<	return new MapReduceMappingsTask<K,V,U>
4630	<	(map, null, -1, null, transformer, reducer);
4631	<	}
4632	<
4633	<	/**
4634	<	* Returns a task that when invoked, returns the result of
4635	<	* accumulating the given transformation of all (key, value) pairs
4636	<	* using the given reducer to combine values, and the given
4637	<	* basis as an identity value.
4638	<	*
4639	<	* @param map the map
4640	<	* @param transformer a function returning the transformation
4641	<	* for an element
4642	<	* @param basis the identity (initial default value) for the reduction
4643	<	* @param reducer a commutative associative combining function
4644	<	* @return the task
4645	<	*/
4646	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4647	<	(ConcurrentHashMapV8<K,V> map,
4648	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
4649	<	double basis,
4650	<	DoubleByDoubleToDouble reducer) {
4651	<	if (transformer == null || reducer == null)
4652	<	throw new NullPointerException();
4653	<	return new MapReduceMappingsToDoubleTask<K,V>
4654	<	(map, null, -1, null, transformer, basis, reducer);
4655	<	}
4656	<
4657	<	/**
4658	<	* Returns a task that when invoked, returns the result of
4659	<	* accumulating the given transformation of all (key, value) pairs
4660	<	* using the given reducer to combine values, and the given
4661	<	* basis as an identity value.
4662	<	*
4663	<	* @param map the map
4664	<	* @param transformer a function returning the transformation
4665	<	* for an element
4666	<	* @param basis the identity (initial default value) for the reduction
4667	<	* @param reducer a commutative associative combining function
4668	<	* @return the task
4669	<	*/
4670	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4671	<	(ConcurrentHashMapV8<K,V> map,
4672	<	ObjectByObjectToLong<? super K, ? super V> transformer,
4673	<	long basis,
4674	<	LongByLongToLong reducer) {
4675	<	if (transformer == null || reducer == null)
4676	<	throw new NullPointerException();
4677	<	return new MapReduceMappingsToLongTask<K,V>
4678	<	(map, null, -1, null, transformer, basis, reducer);
4679	<	}
4680	<
4681	<	/**
4682	<	* Returns a task that when invoked, returns the result of
4683	<	* accumulating the given transformation of all (key, value) pairs
4684	<	* using the given reducer to combine values, and the given
4685	<	* basis as an identity value.
4686	<	*
4687	<	* @param transformer a function returning the transformation
4688	<	* for an element
4689	<	* @param basis the identity (initial default value) for the reduction
4690	<	* @param reducer a commutative associative combining function
4691	<	* @return the task
4692	<	*/
4693	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4694	<	(ConcurrentHashMapV8<K,V> map,
4695	<	ObjectByObjectToInt<? super K, ? super V> transformer,
4696	<	int basis,
4697	<	IntByIntToInt reducer) {
4698	<	if (transformer == null || reducer == null)
4699	<	throw new NullPointerException();
4700	<	return new MapReduceMappingsToIntTask<K,V>
4701	<	(map, null, -1, null, transformer, basis, reducer);
4702	<	}
4703	<
4704	<	/**
4705	<	* Returns a task that when invoked, performs the given action
4706	<	* for each key.
4707	<	*
4708	<	* @param map the map
4709	<	* @param action the action
4710	<	* @return the task
4711	<	*/
4712	<	public static <K,V> ForkJoinTask<Void> forEachKey
4713	<	(ConcurrentHashMapV8<K,V> map,
4714	<	Action<K> action) {
4715	<	if (action == null) throw new NullPointerException();
4716	<	return new ForEachKeyTask<K,V>(map, null, -1, action);
4717	<	}
4718	<
4719	<	/**
4720	<	* Returns a task that when invoked, performs the given action
4721	<	* for each non-null transformation of each key.
4722	<	*
4723	<	* @param map the map
4724	<	* @param transformer a function returning the transformation
4725	<	* for an element, or null if there is no transformation (in
4726	<	* which case the action is not applied)
4727	<	* @param action the action
4728	<	* @return the task
4729	<	*/
4730	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4731	<	(ConcurrentHashMapV8<K,V> map,
4732	<	Fun<? super K, ? extends U> transformer,
4733	<	Action<U> action) {
4734	<	if (transformer == null || action == null)
4735	<	throw new NullPointerException();
4736	<	return new ForEachTransformedKeyTask<K,V,U>
4737	<	(map, null, -1, transformer, action);
4738	<	}
4739	<
4740	<	/**
4741	<	* Returns a task that when invoked, returns a non-null result
4742	<	* from applying the given search function on each key, or
4743	<	* null if none.  Upon success, further element processing is
4744	<	* suppressed and the results of any other parallel
4745	<	* invocations of the search function are ignored.
4746	<	*
4747	<	* @param map the map
4748	<	* @param searchFunction a function returning a non-null
4749	<	* result on success, else null
4750	<	* @return the task
4751	<	*/
4752	<	public static <K,V,U> ForkJoinTask<U> searchKeys
4753	<	(ConcurrentHashMapV8<K,V> map,
4754	<	Fun<? super K, ? extends U> searchFunction) {
4755	<	if (searchFunction == null) throw new NullPointerException();
4756	<	return new SearchKeysTask<K,V,U>
4757	<	(map, null, -1, searchFunction,
4758	<	new AtomicReference<U>());
4759	<	}
4760	<
4761	<	/**
4762	<	* Returns a task that when invoked, returns the result of
4763	<	* accumulating all keys using the given reducer to combine
4764	<	* values, or null if none.
4765	<	*
4766	<	* @param map the map
4767	<	* @param reducer a commutative associative combining function
4768	<	* @return the task
4769	<	*/
4770	<	public static <K,V> ForkJoinTask<K> reduceKeys
4771	<	(ConcurrentHashMapV8<K,V> map,
4772	<	BiFun<? super K, ? super K, ? extends K> reducer) {
4773	<	if (reducer == null) throw new NullPointerException();
4774	<	return new ReduceKeysTask<K,V>
4775	<	(map, null, -1, null, reducer);
4776	<	}
4777	<
4778	<	/**
4779	<	* Returns a task that when invoked, returns the result of
4780	<	* accumulating the given transformation of all keys using the given
4781	<	* reducer to combine values, or null if none.
4782	<	*
4783	<	* @param map the map
4784	<	* @param transformer a function returning the transformation
4785	<	* for an element, or null if there is no transformation (in
4786	<	* which case it is not combined).
4787	<	* @param reducer a commutative associative combining function
4788	<	* @return the task
4789	<	*/
4790	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
4791	<	(ConcurrentHashMapV8<K,V> map,
4792	<	Fun<? super K, ? extends U> transformer,
4793	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4794	<	if (transformer == null || reducer == null)
4795	<	throw new NullPointerException();
4796	<	return new MapReduceKeysTask<K,V,U>
4797	<	(map, null, -1, null, transformer, reducer);
4798	<	}
4799	<
4800	<	/**
4801	<	* Returns a task that when invoked, returns the result of
4802	<	* accumulating the given transformation of all keys using the given
4803	<	* reducer to combine values, and the given basis as an
4804	<	* identity value.
4805	<	*
4806	<	* @param map the map
4807	<	* @param transformer a function returning the transformation
4808	<	* for an element
4809	<	* @param basis the identity (initial default value) for the reduction
4810	<	* @param reducer a commutative associative combining function
4811	<	* @return the task
4812	<	*/
4813	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4814	<	(ConcurrentHashMapV8<K,V> map,
4815	<	ObjectToDouble<? super K> transformer,
4816	<	double basis,
4817	<	DoubleByDoubleToDouble reducer) {
4818	<	if (transformer == null || reducer == null)
4819	<	throw new NullPointerException();
4820	<	return new MapReduceKeysToDoubleTask<K,V>
4821	<	(map, null, -1, null, transformer, basis, reducer);
4822	<	}
4823	<
4824	<	/**
4825	<	* Returns a task that when invoked, returns the result of
4826	<	* accumulating the given transformation of all keys using the given
4827	<	* reducer to combine values, and the given basis as an
4828	<	* identity value.
4829	<	*
4830	<	* @param map the map
4831	<	* @param transformer a function returning the transformation
4832	<	* for an element
4833	<	* @param basis the identity (initial default value) for the reduction
4834	<	* @param reducer a commutative associative combining function
4835	<	* @return the task
4836	<	*/
4837	<	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
4838	<	(ConcurrentHashMapV8<K,V> map,
4839	<	ObjectToLong<? super K> transformer,
4840	<	long basis,
4841	<	LongByLongToLong reducer) {
4842	<	if (transformer == null || reducer == null)
4843	<	throw new NullPointerException();
4844	<	return new MapReduceKeysToLongTask<K,V>
4845	<	(map, null, -1, null, transformer, basis, reducer);
4846	<	}
4847	<
4848	<	/**
4849	<	* Returns a task that when invoked, returns the result of
4850	<	* accumulating the given transformation of all keys using the given
4851	<	* reducer to combine values, and the given basis as an
4852	<	* identity value.
4853	<	*
4854	<	* @param map the map
4855	<	* @param transformer a function returning the transformation
4856	<	* for an element
4857	<	* @param basis the identity (initial default value) for the reduction
4858	<	* @param reducer a commutative associative combining function
4859	<	* @return the task
4860	<	*/
4861	<	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
4862	<	(ConcurrentHashMapV8<K,V> map,
4863	<	ObjectToInt<? super K> transformer,
4864	<	int basis,
4865	<	IntByIntToInt reducer) {
4866	<	if (transformer == null || reducer == null)
4867	<	throw new NullPointerException();
4868	<	return new MapReduceKeysToIntTask<K,V>
4869	<	(map, null, -1, null, transformer, basis, reducer);
4870	<	}
4871	<
4872	<	/**
4873	<	* Returns a task that when invoked, performs the given action
4874	<	* for each value.
4875	<	*
4876	<	* @param map the map
4877	<	* @param action the action
4878	<	*/
4879	<	public static <K,V> ForkJoinTask<Void> forEachValue
4880	<	(ConcurrentHashMapV8<K,V> map,
4881	<	Action<V> action) {
4882	<	if (action == null) throw new NullPointerException();
4883	<	return new ForEachValueTask<K,V>(map, null, -1, action);
4884	<	}
4885	<
4886	<	/**
4887	<	* Returns a task that when invoked, performs the given action
4888	<	* for each non-null transformation of each value.
4889	<	*
4890	<	* @param map the map
4891	<	* @param transformer a function returning the transformation
4892	<	* for an element, or null if there is no transformation (in
4893	<	* which case the action is not applied)
4894	<	* @param action the action
4895	<	*/
4896	<	public static <K,V,U> ForkJoinTask<Void> forEachValue
4897	<	(ConcurrentHashMapV8<K,V> map,
4898	<	Fun<? super V, ? extends U> transformer,
4899	<	Action<U> action) {
4900	<	if (transformer == null || action == null)
4901	<	throw new NullPointerException();
4902	<	return new ForEachTransformedValueTask<K,V,U>
4903	<	(map, null, -1, transformer, action);
4904	<	}
4905	<
4906	<	/**
4907	<	* Returns a task that when invoked, returns a non-null result
4908	<	* from applying the given search function on each value, or
4909	<	* null if none.  Upon success, further element processing is
4910	<	* suppressed and the results of any other parallel
4911	<	* invocations of the search function are ignored.
4912	<	*
4913	<	* @param map the map
4914	<	* @param searchFunction a function returning a non-null
4915	<	* result on success, else null
4916	<	* @return the task
4917	<	*/
4918	<	public static <K,V,U> ForkJoinTask<U> searchValues
4919	<	(ConcurrentHashMapV8<K,V> map,
4920	<	Fun<? super V, ? extends U> searchFunction) {
4921	<	if (searchFunction == null) throw new NullPointerException();
4922	<	return new SearchValuesTask<K,V,U>
4923	<	(map, null, -1, searchFunction,
4924	<	new AtomicReference<U>());
4925	<	}
4926	<
4927	<	/**
4928	<	* Returns a task that when invoked, returns the result of
4929	<	* accumulating all values using the given reducer to combine
4930	<	* values, or null if none.
4931	<	*
4932	<	* @param map the map
4933	<	* @param reducer a commutative associative combining function
4934	<	* @return the task
4935	<	*/
4936	<	public static <K,V> ForkJoinTask<V> reduceValues
4937	<	(ConcurrentHashMapV8<K,V> map,
4938	<	BiFun<? super V, ? super V, ? extends V> reducer) {
4939	<	if (reducer == null) throw new NullPointerException();
4940	<	return new ReduceValuesTask<K,V>
4941	<	(map, null, -1, null, reducer);
4942	<	}
4943	<
4944	<	/**
4945	<	* Returns a task that when invoked, returns the result of
4946	<	* accumulating the given transformation of all values using the
4947	<	* given reducer to combine values, or null if none.
4948	<	*
4949	<	* @param map the map
4950	<	* @param transformer a function returning the transformation
4951	<	* for an element, or null if there is no transformation (in
4952	<	* which case it is not combined).
4953	<	* @param reducer a commutative associative combining function
4954	<	* @return the task
4955	<	*/
4956	<	public static <K,V,U> ForkJoinTask<U> reduceValues
4957	<	(ConcurrentHashMapV8<K,V> map,
4958	<	Fun<? super V, ? extends U> transformer,
4959	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4960	<	if (transformer == null || reducer == null)
4961	<	throw new NullPointerException();
4962	<	return new MapReduceValuesTask<K,V,U>
4963	<	(map, null, -1, null, transformer, reducer);
4964	<	}
4965	<
4966	<	/**
4967	<	* Returns a task that when invoked, returns the result of
4968	<	* accumulating the given transformation of all values using the
4969	<	* given reducer to combine values, and the given basis as an
4970	<	* identity value.
4971	<	*
4972	<	* @param map the map
4973	<	* @param transformer a function returning the transformation
4974	<	* for an element
4975	<	* @param basis the identity (initial default value) for the reduction
4976	<	* @param reducer a commutative associative combining function
4977	<	* @return the task
4978	<	*/
4979	<	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
4980	<	(ConcurrentHashMapV8<K,V> map,
4981	<	ObjectToDouble<? super V> transformer,
4982	<	double basis,
4983	<	DoubleByDoubleToDouble reducer) {
4984	<	if (transformer == null || reducer == null)
4985	<	throw new NullPointerException();
4986	<	return new MapReduceValuesToDoubleTask<K,V>
4987	<	(map, null, -1, null, transformer, basis, reducer);
4988	<	}
4989	<
4990	<	/**
4991	<	* Returns a task that when invoked, returns the result of
4992	<	* accumulating the given transformation of all values using the
4993	<	* given reducer to combine values, and the given basis as an
4994	<	* identity value.
4995	<	*
4996	<	* @param map the map
4997	<	* @param transformer a function returning the transformation
4998	<	* for an element
4999	<	* @param basis the identity (initial default value) for the reduction
5000	<	* @param reducer a commutative associative combining function
5001	<	* @return the task
5002	<	*/
5003	<	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
5004	<	(ConcurrentHashMapV8<K,V> map,
5005	<	ObjectToLong<? super V> transformer,
5006	<	long basis,
5007	<	LongByLongToLong reducer) {
5008	<	if (transformer == null || reducer == null)
5009	<	throw new NullPointerException();
5010	<	return new MapReduceValuesToLongTask<K,V>
5011	<	(map, null, -1, null, transformer, basis, reducer);
5012	<	}
5013	<
5014	<	/**
5015	<	* Returns a task that when invoked, returns the result of
5016	<	* accumulating the given transformation of all values using the
5017	<	* given reducer to combine values, and the given basis as an
5018	<	* identity value.
5019	<	*
5020	<	* @param map the map
5021	<	* @param transformer a function returning the transformation
5022	<	* for an element
5023	<	* @param basis the identity (initial default value) for the reduction
5024	<	* @param reducer a commutative associative combining function
5025	<	* @return the task
5026	<	*/
5027	<	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
5028	<	(ConcurrentHashMapV8<K,V> map,
5029	<	ObjectToInt<? super V> transformer,
5030	<	int basis,
5031	<	IntByIntToInt reducer) {
5032	<	if (transformer == null || reducer == null)
5033	<	throw new NullPointerException();
5034	<	return new MapReduceValuesToIntTask<K,V>
5035	<	(map, null, -1, null, transformer, basis, reducer);
5036	<	}
5037	<
5038	<	/**
5039	<	* Returns a task that when invoked, perform the given action
5040	<	* for each entry.
5041	<	*
5042	<	* @param map the map
5043	<	* @param action the action
5044	<	*/
5045	<	public static <K,V> ForkJoinTask<Void> forEachEntry
5046	<	(ConcurrentHashMapV8<K,V> map,
5047	<	Action<Map.Entry<K,V>> action) {
5048	<	if (action == null) throw new NullPointerException();
5049	<	return new ForEachEntryTask<K,V>(map, null, -1, action);
5050	<	}
5051	<
5052	<	/**
5053	<	* Returns a task that when invoked, perform the given action
5054	<	* for each non-null transformation of each entry.
5055	<	*
5056	<	* @param map the map
5057	<	* @param transformer a function returning the transformation
5058	<	* for an element, or null if there is no transformation (in
5059	<	* which case the action is not applied)
5060	<	* @param action the action
5061	<	*/
5062	<	public static <K,V,U> ForkJoinTask<Void> forEachEntry
5063	<	(ConcurrentHashMapV8<K,V> map,
5064	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5065	<	Action<U> action) {
5066	<	if (transformer == null || action == null)
5067	<	throw new NullPointerException();
5068	<	return new ForEachTransformedEntryTask<K,V,U>
5069	<	(map, null, -1, transformer, action);
5070	<	}
5071	<
5072	<	/**
5073	<	* Returns a task that when invoked, returns a non-null result
5074	<	* from applying the given search function on each entry, or
5075	<	* null if none.  Upon success, further element processing is
5076	<	* suppressed and the results of any other parallel
5077	<	* invocations of the search function are ignored.
5078	<	*
5079	<	* @param map the map
5080	<	* @param searchFunction a function returning a non-null
5081	<	* result on success, else null
5082	<	* @return the task
5083	<	*/
5084	<	public static <K,V,U> ForkJoinTask<U> searchEntries
5085	<	(ConcurrentHashMapV8<K,V> map,
5086	<	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
5087	<	if (searchFunction == null) throw new NullPointerException();
5088	<	return new SearchEntriesTask<K,V,U>
5089	<	(map, null, -1, searchFunction,
5090	<	new AtomicReference<U>());
5091	<	}
5092	<
5093	<	/**
5094	<	* Returns a task that when invoked, returns the result of
5095	<	* accumulating all entries using the given reducer to combine
5096	<	* values, or null if none.
5097	<	*
5098	<	* @param map the map
5099	<	* @param reducer a commutative associative combining function
5100	<	* @return the task
5101	<	*/
5102	<	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
5103	<	(ConcurrentHashMapV8<K,V> map,
5104	<	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5105	<	if (reducer == null) throw new NullPointerException();
5106	<	return new ReduceEntriesTask<K,V>
5107	<	(map, null, -1, null, reducer);
5108	<	}
5109	<
5110	<	/**
5111	<	* Returns a task that when invoked, returns the result of
5112	<	* accumulating the given transformation of all entries using the
5113	<	* given reducer to combine values, or null if none.
5114	<	*
5115	<	* @param map the map
5116	<	* @param transformer a function returning the transformation
5117	<	* for an element, or null if there is no transformation (in
5118	<	* which case it is not combined).
5119	<	* @param reducer a commutative associative combining function
5120	<	* @return the task
5121	<	*/
5122	<	public static <K,V,U> ForkJoinTask<U> reduceEntries
5123	<	(ConcurrentHashMapV8<K,V> map,
5124	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5125	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5126	<	if (transformer == null || reducer == null)
5127	<	throw new NullPointerException();
5128	<	return new MapReduceEntriesTask<K,V,U>
5129	<	(map, null, -1, null, transformer, reducer);
5130	<	}
5131	<
5132	<	/**
5133	<	* Returns a task that when invoked, returns the result of
5134	<	* accumulating the given transformation of all entries using the
5135	<	* given reducer to combine values, and the given basis as an
5136	<	* identity value.
5137	<	*
5138	<	* @param map the map
5139	<	* @param transformer a function returning the transformation
5140	<	* for an element
5141	<	* @param basis the identity (initial default value) for the reduction
5142	<	* @param reducer a commutative associative combining function
5143	<	* @return the task
5144	<	*/
5145	<	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
5146	<	(ConcurrentHashMapV8<K,V> map,
5147	<	ObjectToDouble<Map.Entry<K,V>> transformer,
5148	<	double basis,
5149	<	DoubleByDoubleToDouble reducer) {
5150	<	if (transformer == null || reducer == null)
5151	<	throw new NullPointerException();
5152	<	return new MapReduceEntriesToDoubleTask<K,V>
5153	<	(map, null, -1, null, transformer, basis, reducer);
5154	<	}
5155	<
5156	<	/**
5157	<	* Returns a task that when invoked, returns the result of
5158	<	* accumulating the given transformation of all entries using the
5159	<	* given reducer to combine values, and the given basis as an
5160	<	* identity value.
5161	<	*
5162	<	* @param map the map
5163	<	* @param transformer a function returning the transformation
5164	<	* for an element
5165	<	* @param basis the identity (initial default value) for the reduction
5166	<	* @param reducer a commutative associative combining function
5167	<	* @return the task
5168	<	*/
5169	<	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
5170	<	(ConcurrentHashMapV8<K,V> map,
5171	<	ObjectToLong<Map.Entry<K,V>> transformer,
5172	<	long basis,
5173	<	LongByLongToLong reducer) {
5174	<	if (transformer == null || reducer == null)
5175	<	throw new NullPointerException();
5176	<	return new MapReduceEntriesToLongTask<K,V>
5177	<	(map, null, -1, null, transformer, basis, reducer);
4684	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4685	>	Node<K,V>[] tab;        // same as Traverser
4686	>	Node<K,V> next;
4687	>	int index;
4688	>	int baseIndex;
4689	>	int baseLimit;
4690	>	final int baseSize;
4691	>	int batch;              // split control
4692	>
4693	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4694	>	super(par);
4695	>	this.batch = b;
4696	>	this.index = this.baseIndex = i;
4697	>	if ((this.tab = t) == null)
4698	>	this.baseSize = this.baseLimit = 0;
4699	>	else if (par == null)
4700	>	this.baseSize = this.baseLimit = t.length;
4701	>	else {
4702	>	this.baseLimit = f;
4703	>	this.baseSize = par.baseSize;
4704	>	}
4705		}
4706
4707		/**
4708	<	* Returns a task that when invoked, returns the result of
5182	<	* accumulating the given transformation of all entries using the
5183	<	* given reducer to combine values, and the given basis as an
5184	<	* identity value.
5185	<	*
5186	<	* @param map the map
5187	<	* @param transformer a function returning the transformation
5188	<	* for an element
5189	<	* @param basis the identity (initial default value) for the reduction
5190	<	* @param reducer a commutative associative combining function
5191	<	* @return the task
4708	>	* Same as Traverser version
4709		*/
4710	<	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
4711	<	(ConcurrentHashMapV8<K,V> map,
4712	<	ObjectToInt<Map.Entry<K,V>> transformer,
4713	<	int basis,
4714	<	IntByIntToInt reducer) {
4715	<	if (transformer == null || reducer == null)
4716	<	throw new NullPointerException();
4717	<	return new MapReduceEntriesToIntTask<K,V>
4718	<	(map, null, -1, null, transformer, basis, reducer);
4710	>	final Node<K,V> advance() {
4711	>	Node<K,V> e;
4712	>	if ((e = next) != null)
4713	>	e = e.next;
4714	>	for (;;) {
4715	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4716	>	if (e != null)
4717	>	return next = e;
4718	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4719	>	(n = t.length) <= (i = index) || i < 0)
4720	>	return next = null;
4721	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4722	>	if (e instanceof ForwardingNode) {
4723	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4724	>	e = null;
4725	>	continue;
4726	>	}
4727	>	else if (e instanceof TreeBin)
4728	>	e = ((TreeBin<K,V>)e).first;
4729	>	else
4730	>	e = null;
4731	>	}
4732	>	if ((index += baseSize) >= n)
4733	>	index = ++baseIndex;    // visit upper slots if present
4734	>	}
4735		}
4736		}
4737
5205	–	// -------------------------------------------------------
5206	–
4738		/*
4739		* Task classes. Coded in a regular but ugly format/style to
4740		* simplify checks that each variant differs in the right way from
#	Line 5211 | Line 4742 | public class ConcurrentHashMapV8<K, V>
4742		* that we've already null-checked task arguments, so we force
4743		* simplest hoisted bypass to help avoid convoluted traps.
4744		*/
4745	<
4746	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4747	<	extends Traverser<K,V,Void> {
4748	<	final Action<K> action;
4745	>	@SuppressWarnings("serial")
4746	>	static final class ForEachKeyTask<K,V>
4747	>	extends BulkTask<K,V,Void> {
4748	>	final Action<? super K> action;
4749		ForEachKeyTask
4750	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4751	<	Action<K> action) {
4752	<	super(m, p, b);
4750	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4751	>	Action<? super K> action) {
4752	>	super(p, b, i, f, t);
4753		this.action = action;
4754		}
4755	<	@SuppressWarnings("unchecked") public final void compute() {
4756	<	final Action<K> action;
4755	>	public final void compute() {
4756	>	final Action<? super K> action;
4757		if ((action = this.action) != null) {
4758	<	for (int b; (b = preSplit()) > 0;)
4759	<	new ForEachKeyTask<K,V>(map, this, b, action).fork();
4760	<	while (advance() != null)
4761	<	action.apply((K)nextKey);
4758	>	for (int i = baseIndex, f, h; batch > 0 &&
4759	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4760	>	addToPendingCount(1);
4761	>	new ForEachKeyTask<K,V>
4762	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4763	>	action).fork();
4764	>	}
4765	>	for (Node<K,V> p; (p = advance()) != null;)
4766	>	action.apply(p.key);
4767		propagateCompletion();
4768		}
4769		}
4770		}
4771
4772	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4773	<	extends Traverser<K,V,Void> {
4774	<	final Action<V> action;
4772	>	@SuppressWarnings("serial")
4773	>	static final class ForEachValueTask<K,V>
4774	>	extends BulkTask<K,V,Void> {
4775	>	final Action<? super V> action;
4776		ForEachValueTask
4777	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4778	<	Action<V> action) {
4779	<	super(m, p, b);
4777	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4778	>	Action<? super V> action) {
4779	>	super(p, b, i, f, t);
4780		this.action = action;
4781		}
4782	<	@SuppressWarnings("unchecked") public final void compute() {
4783	<	final Action<V> action;
4782	>	public final void compute() {
4783	>	final Action<? super V> action;
4784		if ((action = this.action) != null) {
4785	<	for (int b; (b = preSplit()) > 0;)
4786	<	new ForEachValueTask<K,V>(map, this, b, action).fork();
4787	<	Object v;
4788	<	while ((v = advance()) != null)
4789	<	action.apply((V)v);
4785	>	for (int i = baseIndex, f, h; batch > 0 &&
4786	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4787	>	addToPendingCount(1);
4788	>	new ForEachValueTask<K,V>
4789	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4790	>	action).fork();
4791	>	}
4792	>	for (Node<K,V> p; (p = advance()) != null;)
4793	>	action.apply(p.val);
4794		propagateCompletion();
4795		}
4796		}
4797		}
4798
4799	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4800	<	extends Traverser<K,V,Void> {
4801	<	final Action<Entry<K,V>> action;
4799	>	@SuppressWarnings("serial")
4800	>	static final class ForEachEntryTask<K,V>
4801	>	extends BulkTask<K,V,Void> {
4802	>	final Action<? super Entry<K,V>> action;
4803		ForEachEntryTask
4804	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4805	<	Action<Entry<K,V>> action) {
4806	<	super(m, p, b);
4804	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4805	>	Action<? super Entry<K,V>> action) {
4806	>	super(p, b, i, f, t);
4807		this.action = action;
4808		}
4809	<	@SuppressWarnings("unchecked") public final void compute() {
4810	<	final Action<Entry<K,V>> action;
4809	>	public final void compute() {
4810	>	final Action<? super Entry<K,V>> action;
4811		if ((action = this.action) != null) {
4812	<	for (int b; (b = preSplit()) > 0;)
4813	<	new ForEachEntryTask<K,V>(map, this, b, action).fork();
4814	<	Object v;
4815	<	while ((v = advance()) != null)
4816	<	action.apply(entryFor((K)nextKey, (V)v));
4812	>	for (int i = baseIndex, f, h; batch > 0 &&
4813	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4814	>	addToPendingCount(1);
4815	>	new ForEachEntryTask<K,V>
4816	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4817	>	action).fork();
4818	>	}
4819	>	for (Node<K,V> p; (p = advance()) != null; )
4820	>	action.apply(p);
4821		propagateCompletion();
4822		}
4823		}
4824		}
4825
4826	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4827	<	extends Traverser<K,V,Void> {
4828	<	final BiAction<K,V> action;
4826	>	@SuppressWarnings("serial")
4827	>	static final class ForEachMappingTask<K,V>
4828	>	extends BulkTask<K,V,Void> {
4829	>	final BiAction<? super K, ? super V> action;
4830		ForEachMappingTask
4831	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4832	<	BiAction<K,V> action) {
4833	<	super(m, p, b);
4831	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4832	>	BiAction<? super K,? super V> action) {
4833	>	super(p, b, i, f, t);
4834		this.action = action;
4835		}
4836	<	@SuppressWarnings("unchecked") public final void compute() {
4837	<	final BiAction<K,V> action;
4836	>	public final void compute() {
4837	>	final BiAction<? super K, ? super V> action;
4838		if ((action = this.action) != null) {
4839	<	for (int b; (b = preSplit()) > 0;)
4840	<	new ForEachMappingTask<K,V>(map, this, b, action).fork();
4841	<	Object v;
4842	<	while ((v = advance()) != null)
4843	<	action.apply((K)nextKey, (V)v);
4839	>	for (int i = baseIndex, f, h; batch > 0 &&
4840	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4841	>	addToPendingCount(1);
4842	>	new ForEachMappingTask<K,V>
4843	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4844	>	action).fork();
4845	>	}
4846	>	for (Node<K,V> p; (p = advance()) != null; )
4847	>	action.apply(p.key, p.val);
4848		propagateCompletion();
4849		}
4850		}
4851		}
4852
4853	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4854	<	extends Traverser<K,V,Void> {
4853	>	@SuppressWarnings("serial")
4854	>	static final class ForEachTransformedKeyTask<K,V,U>
4855	>	extends BulkTask<K,V,Void> {
4856		final Fun<? super K, ? extends U> transformer;
4857	<	final Action<U> action;
4857	>	final Action<? super U> action;
4858		ForEachTransformedKeyTask
4859	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4860	<	Fun<? super K, ? extends U> transformer, Action<U> action) {
4861	<	super(m, p, b);
4859	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4860	>	Fun<? super K, ? extends U> transformer, Action<? super U> action) {
4861	>	super(p, b, i, f, t);
4862		this.transformer = transformer; this.action = action;
4863		}
4864	<	@SuppressWarnings("unchecked") public final void compute() {
4864	>	public final void compute() {
4865		final Fun<? super K, ? extends U> transformer;
4866	<	final Action<U> action;
4866	>	final Action<? super U> action;
4867		if ((transformer = this.transformer) != null &&
4868		(action = this.action) != null) {
4869	<	for (int b; (b = preSplit()) > 0;)
4869	>	for (int i = baseIndex, f, h; batch > 0 &&
4870	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4871	>	addToPendingCount(1);
4872		new ForEachTransformedKeyTask<K,V,U>
4873	<	(map, this, b, transformer, action).fork();
4874	<	U u;
4875	<	while (advance() != null) {
4876	<	if ((u = transformer.apply((K)nextKey)) != null)
4873	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4874	>	transformer, action).fork();
4875	>	}
4876	>	for (Node<K,V> p; (p = advance()) != null; ) {
4877	>	U u;
4878	>	if ((u = transformer.apply(p.key)) != null)
4879		action.apply(u);
4880		}
4881		propagateCompletion();
#	Line 5327 | Line 4883 | public class ConcurrentHashMapV8<K, V>
4883		}
4884		}
4885
4886	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4887	<	extends Traverser<K,V,Void> {
4886	>	@SuppressWarnings("serial")
4887	>	static final class ForEachTransformedValueTask<K,V,U>
4888	>	extends BulkTask<K,V,Void> {
4889		final Fun<? super V, ? extends U> transformer;
4890	<	final Action<U> action;
4890	>	final Action<? super U> action;
4891		ForEachTransformedValueTask
4892	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4893	<	Fun<? super V, ? extends U> transformer, Action<U> action) {
4894	<	super(m, p, b);
4892	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4893	>	Fun<? super V, ? extends U> transformer, Action<? super U> action) {
4894	>	super(p, b, i, f, t);
4895		this.transformer = transformer; this.action = action;
4896		}
4897	<	@SuppressWarnings("unchecked") public final void compute() {
4897	>	public final void compute() {
4898		final Fun<? super V, ? extends U> transformer;
4899	<	final Action<U> action;
4899	>	final Action<? super U> action;
4900		if ((transformer = this.transformer) != null &&
4901		(action = this.action) != null) {
4902	<	for (int b; (b = preSplit()) > 0;)
4902	>	for (int i = baseIndex, f, h; batch > 0 &&
4903	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4904	>	addToPendingCount(1);
4905		new ForEachTransformedValueTask<K,V,U>
4906	<	(map, this, b, transformer, action).fork();
4907	<	Object v; U u;
4908	<	while ((v = advance()) != null) {
4909	<	if ((u = transformer.apply((V)v)) != null)
4906	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4907	>	transformer, action).fork();
4908	>	}
4909	>	for (Node<K,V> p; (p = advance()) != null; ) {
4910	>	U u;
4911	>	if ((u = transformer.apply(p.val)) != null)
4912		action.apply(u);
4913		}
4914		propagateCompletion();
#	Line 5355 | Line 4916 | public class ConcurrentHashMapV8<K, V>
4916		}
4917		}
4918
4919	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4920	<	extends Traverser<K,V,Void> {
4919	>	@SuppressWarnings("serial")
4920	>	static final class ForEachTransformedEntryTask<K,V,U>
4921	>	extends BulkTask<K,V,Void> {
4922		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4923	<	final Action<U> action;
4923	>	final Action<? super U> action;
4924		ForEachTransformedEntryTask
4925	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4926	<	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<U> action) {
4927	<	super(m, p, b);
4925	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4926	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<? super U> action) {
4927	>	super(p, b, i, f, t);
4928		this.transformer = transformer; this.action = action;
4929		}
4930	<	@SuppressWarnings("unchecked") public final void compute() {
4930	>	public final void compute() {
4931		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4932	<	final Action<U> action;
4932	>	final Action<? super U> action;
4933		if ((transformer = this.transformer) != null &&
4934		(action = this.action) != null) {
4935	<	for (int b; (b = preSplit()) > 0;)
4935	>	for (int i = baseIndex, f, h; batch > 0 &&
4936	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4937	>	addToPendingCount(1);
4938		new ForEachTransformedEntryTask<K,V,U>
4939	<	(map, this, b, transformer, action).fork();
4940	<	Object v; U u;
4941	<	while ((v = advance()) != null) {
4942	<	if ((u = transformer.apply(entryFor((K)nextKey,
4943	<	(V)v))) != null)
4939	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4940	>	transformer, action).fork();
4941	>	}
4942	>	for (Node<K,V> p; (p = advance()) != null; ) {
4943	>	U u;
4944	>	if ((u = transformer.apply(p)) != null)
4945		action.apply(u);
4946		}
4947		propagateCompletion();
#	Line 5384 | Line 4949 | public class ConcurrentHashMapV8<K, V>
4949		}
4950		}
4951
4952	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4953	<	extends Traverser<K,V,Void> {
4952	>	@SuppressWarnings("serial")
4953	>	static final class ForEachTransformedMappingTask<K,V,U>
4954	>	extends BulkTask<K,V,Void> {
4955		final BiFun<? super K, ? super V, ? extends U> transformer;
4956	<	final Action<U> action;
4956	>	final Action<? super U> action;
4957		ForEachTransformedMappingTask
4958	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4958	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4959		BiFun<? super K, ? super V, ? extends U> transformer,
4960	<	Action<U> action) {
4961	<	super(m, p, b);
4960	>	Action<? super U> action) {
4961	>	super(p, b, i, f, t);
4962		this.transformer = transformer; this.action = action;
4963		}
4964	<	@SuppressWarnings("unchecked") public final void compute() {
4964	>	public final void compute() {
4965		final BiFun<? super K, ? super V, ? extends U> transformer;
4966	<	final Action<U> action;
4966	>	final Action<? super U> action;
4967		if ((transformer = this.transformer) != null &&
4968		(action = this.action) != null) {
4969	<	for (int b; (b = preSplit()) > 0;)
4969	>	for (int i = baseIndex, f, h; batch > 0 &&
4970	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4971	>	addToPendingCount(1);
4972		new ForEachTransformedMappingTask<K,V,U>
4973	<	(map, this, b, transformer, action).fork();
4974	<	Object v; U u;
4975	<	while ((v = advance()) != null) {
4976	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
4973	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4974	>	transformer, action).fork();
4975	>	}
4976	>	for (Node<K,V> p; (p = advance()) != null; ) {
4977	>	U u;
4978	>	if ((u = transformer.apply(p.key, p.val)) != null)
4979		action.apply(u);
4980		}
4981		propagateCompletion();
#	Line 5413 | Line 4983 | public class ConcurrentHashMapV8<K, V>
4983		}
4984		}
4985
4986	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4987	<	extends Traverser<K,V,U> {
4986	>	@SuppressWarnings("serial")
4987	>	static final class SearchKeysTask<K,V,U>
4988	>	extends BulkTask<K,V,U> {
4989		final Fun<? super K, ? extends U> searchFunction;
4990		final AtomicReference<U> result;
4991		SearchKeysTask
4992	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4992	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4993		Fun<? super K, ? extends U> searchFunction,
4994		AtomicReference<U> result) {
4995	<	super(m, p, b);
4995	>	super(p, b, i, f, t);
4996		this.searchFunction = searchFunction; this.result = result;
4997		}
4998		public final U getRawResult() { return result.get(); }
4999	<	@SuppressWarnings("unchecked") public final void compute() {
4999	>	public final void compute() {
5000		final Fun<? super K, ? extends U> searchFunction;
5001		final AtomicReference<U> result;
5002		if ((searchFunction = this.searchFunction) != null &&
5003		(result = this.result) != null) {
5004	<	for (int b;;) {
5004	>	for (int i = baseIndex, f, h; batch > 0 &&
5005	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5006		if (result.get() != null)
5007		return;
5008	<	if ((b = preSplit()) <= 0)
5437	<	break;
5008	>	addToPendingCount(1);
5009		new SearchKeysTask<K,V,U>
5010	<	(map, this, b, searchFunction, result).fork();
5010	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5011	>	searchFunction, result).fork();
5012		}
5013		while (result.get() == null) {
5014		U u;
5015	<	if (advance() == null) {
5015	>	Node<K,V> p;
5016	>	if ((p = advance()) == null) {
5017		propagateCompletion();
5018		break;
5019		}
5020	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
5020	>	if ((u = searchFunction.apply(p.key)) != null) {
5021		if (result.compareAndSet(null, u))
5022		quietlyCompleteRoot();
5023		break;
#	Line 5454 | Line 5027 | public class ConcurrentHashMapV8<K, V>
5027		}
5028		}
5029
5030	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
5031	<	extends Traverser<K,V,U> {
5030	>	@SuppressWarnings("serial")
5031	>	static final class SearchValuesTask<K,V,U>
5032	>	extends BulkTask<K,V,U> {
5033		final Fun<? super V, ? extends U> searchFunction;
5034		final AtomicReference<U> result;
5035		SearchValuesTask
5036	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5036	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5037		Fun<? super V, ? extends U> searchFunction,
5038		AtomicReference<U> result) {
5039	<	super(m, p, b);
5039	>	super(p, b, i, f, t);
5040		this.searchFunction = searchFunction; this.result = result;
5041		}
5042		public final U getRawResult() { return result.get(); }
5043	<	@SuppressWarnings("unchecked") public final void compute() {
5043	>	public final void compute() {
5044		final Fun<? super V, ? extends U> searchFunction;
5045		final AtomicReference<U> result;
5046		if ((searchFunction = this.searchFunction) != null &&
5047		(result = this.result) != null) {
5048	<	for (int b;;) {
5048	>	for (int i = baseIndex, f, h; batch > 0 &&
5049	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5050		if (result.get() != null)
5051		return;
5052	<	if ((b = preSplit()) <= 0)
5478	<	break;
5052	>	addToPendingCount(1);
5053		new SearchValuesTask<K,V,U>
5054	<	(map, this, b, searchFunction, result).fork();
5054	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5055	>	searchFunction, result).fork();
5056		}
5057		while (result.get() == null) {
5058	<	Object v; U u;
5059	<	if ((v = advance()) == null) {
5058	>	U u;
5059	>	Node<K,V> p;
5060	>	if ((p = advance()) == null) {
5061		propagateCompletion();
5062		break;
5063		}
5064	<	if ((u = searchFunction.apply((V)v)) != null) {
5064	>	if ((u = searchFunction.apply(p.val)) != null) {
5065		if (result.compareAndSet(null, u))
5066		quietlyCompleteRoot();
5067		break;
#	Line 5495 | Line 5071 | public class ConcurrentHashMapV8<K, V>
5071		}
5072		}
5073
5074	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5075	<	extends Traverser<K,V,U> {
5074	>	@SuppressWarnings("serial")
5075	>	static final class SearchEntriesTask<K,V,U>
5076	>	extends BulkTask<K,V,U> {
5077		final Fun<Entry<K,V>, ? extends U> searchFunction;
5078		final AtomicReference<U> result;
5079		SearchEntriesTask
5080	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5080	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5081		Fun<Entry<K,V>, ? extends U> searchFunction,
5082		AtomicReference<U> result) {
5083	<	super(m, p, b);
5083	>	super(p, b, i, f, t);
5084		this.searchFunction = searchFunction; this.result = result;
5085		}
5086		public final U getRawResult() { return result.get(); }
5087	<	@SuppressWarnings("unchecked") public final void compute() {
5087	>	public final void compute() {
5088		final Fun<Entry<K,V>, ? extends U> searchFunction;
5089		final AtomicReference<U> result;
5090		if ((searchFunction = this.searchFunction) != null &&
5091		(result = this.result) != null) {
5092	<	for (int b;;) {
5092	>	for (int i = baseIndex, f, h; batch > 0 &&
5093	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5094		if (result.get() != null)
5095		return;
5096	<	if ((b = preSplit()) <= 0)
5519	<	break;
5096	>	addToPendingCount(1);
5097		new SearchEntriesTask<K,V,U>
5098	<	(map, this, b, searchFunction, result).fork();
5098	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5099	>	searchFunction, result).fork();
5100		}
5101		while (result.get() == null) {
5102	<	Object v; U u;
5103	<	if ((v = advance()) == null) {
5102	>	U u;
5103	>	Node<K,V> p;
5104	>	if ((p = advance()) == null) {
5105		propagateCompletion();
5106		break;
5107		}
5108	<	if ((u = searchFunction.apply(entryFor((K)nextKey,
5530	<	(V)v))) != null) {
5108	>	if ((u = searchFunction.apply(p)) != null) {
5109		if (result.compareAndSet(null, u))
5110		quietlyCompleteRoot();
5111		return;
#	Line 5537 | Line 5115 | public class ConcurrentHashMapV8<K, V>
5115		}
5116		}
5117
5118	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5119	<	extends Traverser<K,V,U> {
5118	>	@SuppressWarnings("serial")
5119	>	static final class SearchMappingsTask<K,V,U>
5120	>	extends BulkTask<K,V,U> {
5121		final BiFun<? super K, ? super V, ? extends U> searchFunction;
5122		final AtomicReference<U> result;
5123		SearchMappingsTask
5124	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5124	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5125		BiFun<? super K, ? super V, ? extends U> searchFunction,
5126		AtomicReference<U> result) {
5127	<	super(m, p, b);
5127	>	super(p, b, i, f, t);
5128		this.searchFunction = searchFunction; this.result = result;
5129		}
5130		public final U getRawResult() { return result.get(); }
5131	<	@SuppressWarnings("unchecked") public final void compute() {
5131	>	public final void compute() {
5132		final BiFun<? super K, ? super V, ? extends U> searchFunction;
5133		final AtomicReference<U> result;
5134		if ((searchFunction = this.searchFunction) != null &&
5135		(result = this.result) != null) {
5136	<	for (int b;;) {
5136	>	for (int i = baseIndex, f, h; batch > 0 &&
5137	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5138		if (result.get() != null)
5139		return;
5140	<	if ((b = preSplit()) <= 0)
5561	<	break;
5140	>	addToPendingCount(1);
5141		new SearchMappingsTask<K,V,U>
5142	<	(map, this, b, searchFunction, result).fork();
5142	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5143	>	searchFunction, result).fork();
5144		}
5145		while (result.get() == null) {
5146	<	Object v; U u;
5147	<	if ((v = advance()) == null) {
5146	>	U u;
5147	>	Node<K,V> p;
5148	>	if ((p = advance()) == null) {
5149		propagateCompletion();
5150		break;
5151		}
5152	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5152	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5153		if (result.compareAndSet(null, u))
5154		quietlyCompleteRoot();
5155		break;
#	Line 5578 | Line 5159 | public class ConcurrentHashMapV8<K, V>
5159		}
5160		}
5161
5162	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5163	<	extends Traverser<K,V,K> {
5162	>	@SuppressWarnings("serial")
5163	>	static final class ReduceKeysTask<K,V>
5164	>	extends BulkTask<K,V,K> {
5165		final BiFun<? super K, ? super K, ? extends K> reducer;
5166		K result;
5167		ReduceKeysTask<K,V> rights, nextRight;
5168		ReduceKeysTask
5169	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5169	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5170		ReduceKeysTask<K,V> nextRight,
5171		BiFun<? super K, ? super K, ? extends K> reducer) {
5172	<	super(m, p, b); this.nextRight = nextRight;
5172	>	super(p, b, i, f, t); this.nextRight = nextRight;
5173		this.reducer = reducer;
5174		}
5175		public final K getRawResult() { return result; }
5176	<	@SuppressWarnings("unchecked") public final void compute() {
5176	>	public final void compute() {
5177		final BiFun<? super K, ? super K, ? extends K> reducer;
5178		if ((reducer = this.reducer) != null) {
5179	<	for (int b; (b = preSplit()) > 0;)
5179	>	for (int i = baseIndex, f, h; batch > 0 &&
5180	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5181	>	addToPendingCount(1);
5182		(rights = new ReduceKeysTask<K,V>
5183	<	(map, this, b, rights, reducer)).fork();
5183	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5184	>	rights, reducer)).fork();
5185	>	}
5186		K r = null;
5187	<	while (advance() != null) {
5188	<	K u = (K)nextKey;
5189	<	r = (r == null) ? u : reducer.apply(r, u);
5187	>	for (Node<K,V> p; (p = advance()) != null; ) {
5188	>	K u = p.key;
5189	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5190		}
5191		result = r;
5192		CountedCompleter<?> c;
5193		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5194	<	ReduceKeysTask<K,V>
5194	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5195		t = (ReduceKeysTask<K,V>)c,
5196		s = t.rights;
5197		while (s != null) {
#	Line 5620 | Line 5206 | public class ConcurrentHashMapV8<K, V>
5206		}
5207		}
5208
5209	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5210	<	extends Traverser<K,V,V> {
5209	>	@SuppressWarnings("serial")
5210	>	static final class ReduceValuesTask<K,V>
5211	>	extends BulkTask<K,V,V> {
5212		final BiFun<? super V, ? super V, ? extends V> reducer;
5213		V result;
5214		ReduceValuesTask<K,V> rights, nextRight;
5215		ReduceValuesTask
5216	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5216	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5217		ReduceValuesTask<K,V> nextRight,
5218		BiFun<? super V, ? super V, ? extends V> reducer) {
5219	<	super(m, p, b); this.nextRight = nextRight;
5219	>	super(p, b, i, f, t); this.nextRight = nextRight;
5220		this.reducer = reducer;
5221		}
5222		public final V getRawResult() { return result; }
5223	<	@SuppressWarnings("unchecked") public final void compute() {
5223	>	public final void compute() {
5224		final BiFun<? super V, ? super V, ? extends V> reducer;
5225		if ((reducer = this.reducer) != null) {
5226	<	for (int b; (b = preSplit()) > 0;)
5226	>	for (int i = baseIndex, f, h; batch > 0 &&
5227	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5228	>	addToPendingCount(1);
5229		(rights = new ReduceValuesTask<K,V>
5230	<	(map, this, b, rights, reducer)).fork();
5230	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5231	>	rights, reducer)).fork();
5232	>	}
5233		V r = null;
5234	<	Object v;
5235	<	while ((v = advance()) != null) {
5236	<	V u = (V)v;
5646	<	r = (r == null) ? u : reducer.apply(r, u);
5234	>	for (Node<K,V> p; (p = advance()) != null; ) {
5235	>	V v = p.val;
5236	>	r = (r == null) ? v : reducer.apply(r, v);
5237		}
5238		result = r;
5239		CountedCompleter<?> c;
5240		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5241	<	ReduceValuesTask<K,V>
5241	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5242		t = (ReduceValuesTask<K,V>)c,
5243		s = t.rights;
5244		while (s != null) {
#	Line 5663 | Line 5253 | public class ConcurrentHashMapV8<K, V>
5253		}
5254		}
5255
5256	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5257	<	extends Traverser<K,V,Map.Entry<K,V>> {
5256	>	@SuppressWarnings("serial")
5257	>	static final class ReduceEntriesTask<K,V>
5258	>	extends BulkTask<K,V,Map.Entry<K,V>> {
5259		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5260		Map.Entry<K,V> result;
5261		ReduceEntriesTask<K,V> rights, nextRight;
5262		ReduceEntriesTask
5263	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5263	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5264		ReduceEntriesTask<K,V> nextRight,
5265		BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5266	<	super(m, p, b); this.nextRight = nextRight;
5266	>	super(p, b, i, f, t); this.nextRight = nextRight;
5267		this.reducer = reducer;
5268		}
5269		public final Map.Entry<K,V> getRawResult() { return result; }
5270	<	@SuppressWarnings("unchecked") public final void compute() {
5270	>	public final void compute() {
5271		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5272		if ((reducer = this.reducer) != null) {
5273	<	for (int b; (b = preSplit()) > 0;)
5273	>	for (int i = baseIndex, f, h; batch > 0 &&
5274	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5275	>	addToPendingCount(1);
5276		(rights = new ReduceEntriesTask<K,V>
5277	<	(map, this, b, rights, reducer)).fork();
5278	<	Map.Entry<K,V> r = null;
5686	<	Object v;
5687	<	while ((v = advance()) != null) {
5688	<	Map.Entry<K,V> u = entryFor((K)nextKey, (V)v);
5689	<	r = (r == null) ? u : reducer.apply(r, u);
5277	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5278	>	rights, reducer)).fork();
5279		}
5280	+	Map.Entry<K,V> r = null;
5281	+	for (Node<K,V> p; (p = advance()) != null; )
5282	+	r = (r == null) ? p : reducer.apply(r, p);
5283		result = r;
5284		CountedCompleter<?> c;
5285		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5286	<	ReduceEntriesTask<K,V>
5286	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5287		t = (ReduceEntriesTask<K,V>)c,
5288		s = t.rights;
5289		while (s != null) {
#	Line 5706 | Line 5298 | public class ConcurrentHashMapV8<K, V>
5298		}
5299		}
5300
5301	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5302	<	extends Traverser<K,V,U> {
5301	>	@SuppressWarnings("serial")
5302	>	static final class MapReduceKeysTask<K,V,U>
5303	>	extends BulkTask<K,V,U> {
5304		final Fun<? super K, ? extends U> transformer;
5305		final BiFun<? super U, ? super U, ? extends U> reducer;
5306		U result;
5307		MapReduceKeysTask<K,V,U> rights, nextRight;
5308		MapReduceKeysTask
5309	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5309	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5310		MapReduceKeysTask<K,V,U> nextRight,
5311		Fun<? super K, ? extends U> transformer,
5312		BiFun<? super U, ? super U, ? extends U> reducer) {
5313	<	super(m, p, b); this.nextRight = nextRight;
5313	>	super(p, b, i, f, t); this.nextRight = nextRight;
5314		this.transformer = transformer;
5315		this.reducer = reducer;
5316		}
5317		public final U getRawResult() { return result; }
5318	<	@SuppressWarnings("unchecked") public final void compute() {
5318	>	public final void compute() {
5319		final Fun<? super K, ? extends U> transformer;
5320		final BiFun<? super U, ? super U, ? extends U> reducer;
5321		if ((transformer = this.transformer) != null &&
5322		(reducer = this.reducer) != null) {
5323	<	for (int b; (b = preSplit()) > 0;)
5323	>	for (int i = baseIndex, f, h; batch > 0 &&
5324	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5325	>	addToPendingCount(1);
5326		(rights = new MapReduceKeysTask<K,V,U>
5327	<	(map, this, b, rights, transformer, reducer)).fork();
5328	<	U r = null, u;
5329	<	while (advance() != null) {
5330	<	if ((u = transformer.apply((K)nextKey)) != null)
5327	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5328	>	rights, transformer, reducer)).fork();
5329	>	}
5330	>	U r = null;
5331	>	for (Node<K,V> p; (p = advance()) != null; ) {
5332	>	U u;
5333	>	if ((u = transformer.apply(p.key)) != null)
5334		r = (r == null) ? u : reducer.apply(r, u);
5335		}
5336		result = r;
5337		CountedCompleter<?> c;
5338		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5339	<	MapReduceKeysTask<K,V,U>
5339	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5340		t = (MapReduceKeysTask<K,V,U>)c,
5341		s = t.rights;
5342		while (s != null) {
#	Line 5753 | Line 5351 | public class ConcurrentHashMapV8<K, V>
5351		}
5352		}
5353
5354	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5355	<	extends Traverser<K,V,U> {
5354	>	@SuppressWarnings("serial")
5355	>	static final class MapReduceValuesTask<K,V,U>
5356	>	extends BulkTask<K,V,U> {
5357		final Fun<? super V, ? extends U> transformer;
5358		final BiFun<? super U, ? super U, ? extends U> reducer;
5359		U result;
5360		MapReduceValuesTask<K,V,U> rights, nextRight;
5361		MapReduceValuesTask
5362	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5362	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5363		MapReduceValuesTask<K,V,U> nextRight,
5364		Fun<? super V, ? extends U> transformer,
5365		BiFun<? super U, ? super U, ? extends U> reducer) {
5366	<	super(m, p, b); this.nextRight = nextRight;
5366	>	super(p, b, i, f, t); this.nextRight = nextRight;
5367		this.transformer = transformer;
5368		this.reducer = reducer;
5369		}
5370		public final U getRawResult() { return result; }
5371	<	@SuppressWarnings("unchecked") public final void compute() {
5371	>	public final void compute() {
5372		final Fun<? super V, ? extends U> transformer;
5373		final BiFun<? super U, ? super U, ? extends U> reducer;
5374		if ((transformer = this.transformer) != null &&
5375		(reducer = this.reducer) != null) {
5376	<	for (int b; (b = preSplit()) > 0;)
5376	>	for (int i = baseIndex, f, h; batch > 0 &&
5377	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5378	>	addToPendingCount(1);
5379		(rights = new MapReduceValuesTask<K,V,U>
5380	<	(map, this, b, rights, transformer, reducer)).fork();
5381	<	U r = null, u;
5382	<	Object v;
5383	<	while ((v = advance()) != null) {
5384	<	if ((u = transformer.apply((V)v)) != null)
5380	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5381	>	rights, transformer, reducer)).fork();
5382	>	}
5383	>	U r = null;
5384	>	for (Node<K,V> p; (p = advance()) != null; ) {
5385	>	U u;
5386	>	if ((u = transformer.apply(p.val)) != null)
5387		r = (r == null) ? u : reducer.apply(r, u);
5388		}
5389		result = r;
5390		CountedCompleter<?> c;
5391		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5392	<	MapReduceValuesTask<K,V,U>
5392	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5393		t = (MapReduceValuesTask<K,V,U>)c,
5394		s = t.rights;
5395		while (s != null) {
#	Line 5801 | Line 5404 | public class ConcurrentHashMapV8<K, V>
5404		}
5405		}
5406
5407	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5408	<	extends Traverser<K,V,U> {
5407	>	@SuppressWarnings("serial")
5408	>	static final class MapReduceEntriesTask<K,V,U>
5409	>	extends BulkTask<K,V,U> {
5410		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5411		final BiFun<? super U, ? super U, ? extends U> reducer;
5412		U result;
5413		MapReduceEntriesTask<K,V,U> rights, nextRight;
5414		MapReduceEntriesTask
5415	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5415	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5416		MapReduceEntriesTask<K,V,U> nextRight,
5417		Fun<Map.Entry<K,V>, ? extends U> transformer,
5418		BiFun<? super U, ? super U, ? extends U> reducer) {
5419	<	super(m, p, b); this.nextRight = nextRight;
5419	>	super(p, b, i, f, t); this.nextRight = nextRight;
5420		this.transformer = transformer;
5421		this.reducer = reducer;
5422		}
5423		public final U getRawResult() { return result; }
5424	<	@SuppressWarnings("unchecked") public final void compute() {
5424	>	public final void compute() {
5425		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5426		final BiFun<? super U, ? super U, ? extends U> reducer;
5427		if ((transformer = this.transformer) != null &&
5428		(reducer = this.reducer) != null) {
5429	<	for (int b; (b = preSplit()) > 0;)
5429	>	for (int i = baseIndex, f, h; batch > 0 &&
5430	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5431	>	addToPendingCount(1);
5432		(rights = new MapReduceEntriesTask<K,V,U>
5433	<	(map, this, b, rights, transformer, reducer)).fork();
5434	<	U r = null, u;
5435	<	Object v;
5436	<	while ((v = advance()) != null) {
5437	<	if ((u = transformer.apply(entryFor((K)nextKey,
5438	<	(V)v))) != null)
5433	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5434	>	rights, transformer, reducer)).fork();
5435	>	}
5436	>	U r = null;
5437	>	for (Node<K,V> p; (p = advance()) != null; ) {
5438	>	U u;
5439	>	if ((u = transformer.apply(p)) != null)
5440		r = (r == null) ? u : reducer.apply(r, u);
5441		}
5442		result = r;
5443		CountedCompleter<?> c;
5444		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5445	<	MapReduceEntriesTask<K,V,U>
5445	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5446		t = (MapReduceEntriesTask<K,V,U>)c,
5447		s = t.rights;
5448		while (s != null) {
#	Line 5850 | Line 5457 | public class ConcurrentHashMapV8<K, V>
5457		}
5458		}
5459
5460	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5461	<	extends Traverser<K,V,U> {
5460	>	@SuppressWarnings("serial")
5461	>	static final class MapReduceMappingsTask<K,V,U>
5462	>	extends BulkTask<K,V,U> {
5463		final BiFun<? super K, ? super V, ? extends U> transformer;
5464		final BiFun<? super U, ? super U, ? extends U> reducer;
5465		U result;
5466		MapReduceMappingsTask<K,V,U> rights, nextRight;
5467		MapReduceMappingsTask
5468	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5468	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5469		MapReduceMappingsTask<K,V,U> nextRight,
5470		BiFun<? super K, ? super V, ? extends U> transformer,
5471		BiFun<? super U, ? super U, ? extends U> reducer) {
5472	<	super(m, p, b); this.nextRight = nextRight;
5472	>	super(p, b, i, f, t); this.nextRight = nextRight;
5473		this.transformer = transformer;
5474		this.reducer = reducer;
5475		}
5476		public final U getRawResult() { return result; }
5477	<	@SuppressWarnings("unchecked") public final void compute() {
5477	>	public final void compute() {
5478		final BiFun<? super K, ? super V, ? extends U> transformer;
5479		final BiFun<? super U, ? super U, ? extends U> reducer;
5480		if ((transformer = this.transformer) != null &&
5481		(reducer = this.reducer) != null) {
5482	<	for (int b; (b = preSplit()) > 0;)
5482	>	for (int i = baseIndex, f, h; batch > 0 &&
5483	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5484	>	addToPendingCount(1);
5485		(rights = new MapReduceMappingsTask<K,V,U>
5486	<	(map, this, b, rights, transformer, reducer)).fork();
5487	<	U r = null, u;
5488	<	Object v;
5489	<	while ((v = advance()) != null) {
5490	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5486	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5487	>	rights, transformer, reducer)).fork();
5488	>	}
5489	>	U r = null;
5490	>	for (Node<K,V> p; (p = advance()) != null; ) {
5491	>	U u;
5492	>	if ((u = transformer.apply(p.key, p.val)) != null)
5493		r = (r == null) ? u : reducer.apply(r, u);
5494		}
5495		result = r;
5496		CountedCompleter<?> c;
5497		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5498	<	MapReduceMappingsTask<K,V,U>
5498	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5499		t = (MapReduceMappingsTask<K,V,U>)c,
5500		s = t.rights;
5501		while (s != null) {
#	Line 5898 | Line 5510 | public class ConcurrentHashMapV8<K, V>
5510		}
5511		}
5512
5513	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5514	<	extends Traverser<K,V,Double> {
5513	>	@SuppressWarnings("serial")
5514	>	static final class MapReduceKeysToDoubleTask<K,V>
5515	>	extends BulkTask<K,V,Double> {
5516		final ObjectToDouble<? super K> transformer;
5517		final DoubleByDoubleToDouble reducer;
5518		final double basis;
5519		double result;
5520		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5521		MapReduceKeysToDoubleTask
5522	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5522	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5523		MapReduceKeysToDoubleTask<K,V> nextRight,
5524		ObjectToDouble<? super K> transformer,
5525		double basis,
5526		DoubleByDoubleToDouble reducer) {
5527	<	super(m, p, b); this.nextRight = nextRight;
5527	>	super(p, b, i, f, t); this.nextRight = nextRight;
5528		this.transformer = transformer;
5529		this.basis = basis; this.reducer = reducer;
5530		}
5531		public final Double getRawResult() { return result; }
5532	<	@SuppressWarnings("unchecked") public final void compute() {
5532	>	public final void compute() {
5533		final ObjectToDouble<? super K> transformer;
5534		final DoubleByDoubleToDouble reducer;
5535		if ((transformer = this.transformer) != null &&
5536		(reducer = this.reducer) != null) {
5537		double r = this.basis;
5538	<	for (int b; (b = preSplit()) > 0;)
5538	>	for (int i = baseIndex, f, h; batch > 0 &&
5539	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5540	>	addToPendingCount(1);
5541		(rights = new MapReduceKeysToDoubleTask<K,V>
5542	<	(map, this, b, rights, transformer, r, reducer)).fork();
5543	<	while (advance() != null)
5544	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5542	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5543	>	rights, transformer, r, reducer)).fork();
5544	>	}
5545	>	for (Node<K,V> p; (p = advance()) != null; )
5546	>	r = reducer.apply(r, transformer.apply(p.key));
5547		result = r;
5548		CountedCompleter<?> c;
5549		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5550	<	MapReduceKeysToDoubleTask<K,V>
5550	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5551		t = (MapReduceKeysToDoubleTask<K,V>)c,
5552		s = t.rights;
5553		while (s != null) {
#	Line 5942 | Line 5559 | public class ConcurrentHashMapV8<K, V>
5559		}
5560		}
5561
5562	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5563	<	extends Traverser<K,V,Double> {
5562	>	@SuppressWarnings("serial")
5563	>	static final class MapReduceValuesToDoubleTask<K,V>
5564	>	extends BulkTask<K,V,Double> {
5565		final ObjectToDouble<? super V> transformer;
5566		final DoubleByDoubleToDouble reducer;
5567		final double basis;
5568		double result;
5569		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5570		MapReduceValuesToDoubleTask
5571	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5571	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5572		MapReduceValuesToDoubleTask<K,V> nextRight,
5573		ObjectToDouble<? super V> transformer,
5574		double basis,
5575		DoubleByDoubleToDouble reducer) {
5576	<	super(m, p, b); this.nextRight = nextRight;
5576	>	super(p, b, i, f, t); this.nextRight = nextRight;
5577		this.transformer = transformer;
5578		this.basis = basis; this.reducer = reducer;
5579		}
5580		public final Double getRawResult() { return result; }
5581	<	@SuppressWarnings("unchecked") public final void compute() {
5581	>	public final void compute() {
5582		final ObjectToDouble<? super V> transformer;
5583		final DoubleByDoubleToDouble reducer;
5584		if ((transformer = this.transformer) != null &&
5585		(reducer = this.reducer) != null) {
5586		double r = this.basis;
5587	<	for (int b; (b = preSplit()) > 0;)
5587	>	for (int i = baseIndex, f, h; batch > 0 &&
5588	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5589	>	addToPendingCount(1);
5590		(rights = new MapReduceValuesToDoubleTask<K,V>
5591	<	(map, this, b, rights, transformer, r, reducer)).fork();
5592	<	Object v;
5593	<	while ((v = advance()) != null)
5594	<	r = reducer.apply(r, transformer.apply((V)v));
5591	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5592	>	rights, transformer, r, reducer)).fork();
5593	>	}
5594	>	for (Node<K,V> p; (p = advance()) != null; )
5595	>	r = reducer.apply(r, transformer.apply(p.val));
5596		result = r;
5597		CountedCompleter<?> c;
5598		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5599	<	MapReduceValuesToDoubleTask<K,V>
5599	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5600		t = (MapReduceValuesToDoubleTask<K,V>)c,
5601		s = t.rights;
5602		while (s != null) {
#	Line 5987 | Line 5608 | public class ConcurrentHashMapV8<K, V>
5608		}
5609		}
5610
5611	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5612	<	extends Traverser<K,V,Double> {
5611	>	@SuppressWarnings("serial")
5612	>	static final class MapReduceEntriesToDoubleTask<K,V>
5613	>	extends BulkTask<K,V,Double> {
5614		final ObjectToDouble<Map.Entry<K,V>> transformer;
5615		final DoubleByDoubleToDouble reducer;
5616		final double basis;
5617		double result;
5618		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5619		MapReduceEntriesToDoubleTask
5620	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5620	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5621		MapReduceEntriesToDoubleTask<K,V> nextRight,
5622		ObjectToDouble<Map.Entry<K,V>> transformer,
5623		double basis,
5624		DoubleByDoubleToDouble reducer) {
5625	<	super(m, p, b); this.nextRight = nextRight;
5625	>	super(p, b, i, f, t); this.nextRight = nextRight;
5626		this.transformer = transformer;
5627		this.basis = basis; this.reducer = reducer;
5628		}
5629		public final Double getRawResult() { return result; }
5630	<	@SuppressWarnings("unchecked") public final void compute() {
5630	>	public final void compute() {
5631		final ObjectToDouble<Map.Entry<K,V>> transformer;
5632		final DoubleByDoubleToDouble reducer;
5633		if ((transformer = this.transformer) != null &&
5634		(reducer = this.reducer) != null) {
5635		double r = this.basis;
5636	<	for (int b; (b = preSplit()) > 0;)
5636	>	for (int i = baseIndex, f, h; batch > 0 &&
5637	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5638	>	addToPendingCount(1);
5639		(rights = new MapReduceEntriesToDoubleTask<K,V>
5640	<	(map, this, b, rights, transformer, r, reducer)).fork();
5641	<	Object v;
5642	<	while ((v = advance()) != null)
5643	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
5644	<	(V)v)));
5640	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5641	>	rights, transformer, r, reducer)).fork();
5642	>	}
5643	>	for (Node<K,V> p; (p = advance()) != null; )
5644	>	r = reducer.apply(r, transformer.apply(p));
5645		result = r;
5646		CountedCompleter<?> c;
5647		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5648	<	MapReduceEntriesToDoubleTask<K,V>
5648	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5649		t = (MapReduceEntriesToDoubleTask<K,V>)c,
5650		s = t.rights;
5651		while (s != null) {
#	Line 6033 | Line 5657 | public class ConcurrentHashMapV8<K, V>
5657		}
5658		}
5659
5660	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5661	<	extends Traverser<K,V,Double> {
5660	>	@SuppressWarnings("serial")
5661	>	static final class MapReduceMappingsToDoubleTask<K,V>
5662	>	extends BulkTask<K,V,Double> {
5663		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5664		final DoubleByDoubleToDouble reducer;
5665		final double basis;
5666		double result;
5667		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5668		MapReduceMappingsToDoubleTask
5669	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5669	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5670		MapReduceMappingsToDoubleTask<K,V> nextRight,
5671		ObjectByObjectToDouble<? super K, ? super V> transformer,
5672		double basis,
5673		DoubleByDoubleToDouble reducer) {
5674	<	super(m, p, b); this.nextRight = nextRight;
5674	>	super(p, b, i, f, t); this.nextRight = nextRight;
5675		this.transformer = transformer;
5676		this.basis = basis; this.reducer = reducer;
5677		}
5678		public final Double getRawResult() { return result; }
5679	<	@SuppressWarnings("unchecked") public final void compute() {
5679	>	public final void compute() {
5680		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5681		final DoubleByDoubleToDouble reducer;
5682		if ((transformer = this.transformer) != null &&
5683		(reducer = this.reducer) != null) {
5684		double r = this.basis;
5685	<	for (int b; (b = preSplit()) > 0;)
5685	>	for (int i = baseIndex, f, h; batch > 0 &&
5686	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5687	>	addToPendingCount(1);
5688		(rights = new MapReduceMappingsToDoubleTask<K,V>
5689	<	(map, this, b, rights, transformer, r, reducer)).fork();
5690	<	Object v;
5691	<	while ((v = advance()) != null)
5692	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5689	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5690	>	rights, transformer, r, reducer)).fork();
5691	>	}
5692	>	for (Node<K,V> p; (p = advance()) != null; )
5693	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5694		result = r;
5695		CountedCompleter<?> c;
5696		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5697	<	MapReduceMappingsToDoubleTask<K,V>
5697	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5698		t = (MapReduceMappingsToDoubleTask<K,V>)c,
5699		s = t.rights;
5700		while (s != null) {
#	Line 6078 | Line 5706 | public class ConcurrentHashMapV8<K, V>
5706		}
5707		}
5708
5709	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5710	<	extends Traverser<K,V,Long> {
5709	>	@SuppressWarnings("serial")
5710	>	static final class MapReduceKeysToLongTask<K,V>
5711	>	extends BulkTask<K,V,Long> {
5712		final ObjectToLong<? super K> transformer;
5713		final LongByLongToLong reducer;
5714		final long basis;
5715		long result;
5716		MapReduceKeysToLongTask<K,V> rights, nextRight;
5717		MapReduceKeysToLongTask
5718	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5718	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5719		MapReduceKeysToLongTask<K,V> nextRight,
5720		ObjectToLong<? super K> transformer,
5721		long basis,
5722		LongByLongToLong reducer) {
5723	<	super(m, p, b); this.nextRight = nextRight;
5723	>	super(p, b, i, f, t); this.nextRight = nextRight;
5724		this.transformer = transformer;
5725		this.basis = basis; this.reducer = reducer;
5726		}
5727		public final Long getRawResult() { return result; }
5728	<	@SuppressWarnings("unchecked") public final void compute() {
5728	>	public final void compute() {
5729		final ObjectToLong<? super K> transformer;
5730		final LongByLongToLong reducer;
5731		if ((transformer = this.transformer) != null &&
5732		(reducer = this.reducer) != null) {
5733		long r = this.basis;
5734	<	for (int b; (b = preSplit()) > 0;)
5734	>	for (int i = baseIndex, f, h; batch > 0 &&
5735	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5736	>	addToPendingCount(1);
5737		(rights = new MapReduceKeysToLongTask<K,V>
5738	<	(map, this, b, rights, transformer, r, reducer)).fork();
5739	<	while (advance() != null)
5740	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5738	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5739	>	rights, transformer, r, reducer)).fork();
5740	>	}
5741	>	for (Node<K,V> p; (p = advance()) != null; )
5742	>	r = reducer.apply(r, transformer.apply(p.key));
5743		result = r;
5744		CountedCompleter<?> c;
5745		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5746	<	MapReduceKeysToLongTask<K,V>
5746	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5747		t = (MapReduceKeysToLongTask<K,V>)c,
5748		s = t.rights;
5749		while (s != null) {
#	Line 6122 | Line 5755 | public class ConcurrentHashMapV8<K, V>
5755		}
5756		}
5757
5758	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5759	<	extends Traverser<K,V,Long> {
5758	>	@SuppressWarnings("serial")
5759	>	static final class MapReduceValuesToLongTask<K,V>
5760	>	extends BulkTask<K,V,Long> {
5761		final ObjectToLong<? super V> transformer;
5762		final LongByLongToLong reducer;
5763		final long basis;
5764		long result;
5765		MapReduceValuesToLongTask<K,V> rights, nextRight;
5766		MapReduceValuesToLongTask
5767	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5767	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5768		MapReduceValuesToLongTask<K,V> nextRight,
5769		ObjectToLong<? super V> transformer,
5770		long basis,
5771		LongByLongToLong reducer) {
5772	<	super(m, p, b); this.nextRight = nextRight;
5772	>	super(p, b, i, f, t); this.nextRight = nextRight;
5773		this.transformer = transformer;
5774		this.basis = basis; this.reducer = reducer;
5775		}
5776		public final Long getRawResult() { return result; }
5777	<	@SuppressWarnings("unchecked") public final void compute() {
5777	>	public final void compute() {
5778		final ObjectToLong<? super V> transformer;
5779		final LongByLongToLong reducer;
5780		if ((transformer = this.transformer) != null &&
5781		(reducer = this.reducer) != null) {
5782		long r = this.basis;
5783	<	for (int b; (b = preSplit()) > 0;)
5783	>	for (int i = baseIndex, f, h; batch > 0 &&
5784	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5785	>	addToPendingCount(1);
5786		(rights = new MapReduceValuesToLongTask<K,V>
5787	<	(map, this, b, rights, transformer, r, reducer)).fork();
5788	<	Object v;
5789	<	while ((v = advance()) != null)
5790	<	r = reducer.apply(r, transformer.apply((V)v));
5787	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5788	>	rights, transformer, r, reducer)).fork();
5789	>	}
5790	>	for (Node<K,V> p; (p = advance()) != null; )
5791	>	r = reducer.apply(r, transformer.apply(p.val));
5792		result = r;
5793		CountedCompleter<?> c;
5794		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5795	<	MapReduceValuesToLongTask<K,V>
5795	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5796		t = (MapReduceValuesToLongTask<K,V>)c,
5797		s = t.rights;
5798		while (s != null) {
#	Line 6167 | Line 5804 | public class ConcurrentHashMapV8<K, V>
5804		}
5805		}
5806
5807	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5808	<	extends Traverser<K,V,Long> {
5807	>	@SuppressWarnings("serial")
5808	>	static final class MapReduceEntriesToLongTask<K,V>
5809	>	extends BulkTask<K,V,Long> {
5810		final ObjectToLong<Map.Entry<K,V>> transformer;
5811		final LongByLongToLong reducer;
5812		final long basis;
5813		long result;
5814		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5815		MapReduceEntriesToLongTask
5816	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5816	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5817		MapReduceEntriesToLongTask<K,V> nextRight,
5818		ObjectToLong<Map.Entry<K,V>> transformer,
5819		long basis,
5820		LongByLongToLong reducer) {
5821	<	super(m, p, b); this.nextRight = nextRight;
5821	>	super(p, b, i, f, t); this.nextRight = nextRight;
5822		this.transformer = transformer;
5823		this.basis = basis; this.reducer = reducer;
5824		}
5825		public final Long getRawResult() { return result; }
5826	<	@SuppressWarnings("unchecked") public final void compute() {
5826	>	public final void compute() {
5827		final ObjectToLong<Map.Entry<K,V>> transformer;
5828		final LongByLongToLong reducer;
5829		if ((transformer = this.transformer) != null &&
5830		(reducer = this.reducer) != null) {
5831		long r = this.basis;
5832	<	for (int b; (b = preSplit()) > 0;)
5832	>	for (int i = baseIndex, f, h; batch > 0 &&
5833	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5834	>	addToPendingCount(1);
5835		(rights = new MapReduceEntriesToLongTask<K,V>
5836	<	(map, this, b, rights, transformer, r, reducer)).fork();
5837	<	Object v;
5838	<	while ((v = advance()) != null)
5839	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
5840	<	(V)v)));
5836	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5837	>	rights, transformer, r, reducer)).fork();
5838	>	}
5839	>	for (Node<K,V> p; (p = advance()) != null; )
5840	>	r = reducer.apply(r, transformer.apply(p));
5841		result = r;
5842		CountedCompleter<?> c;
5843		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5844	<	MapReduceEntriesToLongTask<K,V>
5844	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5845		t = (MapReduceEntriesToLongTask<K,V>)c,
5846		s = t.rights;
5847		while (s != null) {
#	Line 6213 | Line 5853 | public class ConcurrentHashMapV8<K, V>
5853		}
5854		}
5855
5856	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5857	<	extends Traverser<K,V,Long> {
5856	>	@SuppressWarnings("serial")
5857	>	static final class MapReduceMappingsToLongTask<K,V>
5858	>	extends BulkTask<K,V,Long> {
5859		final ObjectByObjectToLong<? super K, ? super V> transformer;
5860		final LongByLongToLong reducer;
5861		final long basis;
5862		long result;
5863		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5864		MapReduceMappingsToLongTask
5865	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5865	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5866		MapReduceMappingsToLongTask<K,V> nextRight,
5867		ObjectByObjectToLong<? super K, ? super V> transformer,
5868		long basis,
5869		LongByLongToLong reducer) {
5870	<	super(m, p, b); this.nextRight = nextRight;
5870	>	super(p, b, i, f, t); this.nextRight = nextRight;
5871		this.transformer = transformer;
5872		this.basis = basis; this.reducer = reducer;
5873		}
5874		public final Long getRawResult() { return result; }
5875	<	@SuppressWarnings("unchecked") public final void compute() {
5875	>	public final void compute() {
5876		final ObjectByObjectToLong<? super K, ? super V> transformer;
5877		final LongByLongToLong reducer;
5878		if ((transformer = this.transformer) != null &&
5879		(reducer = this.reducer) != null) {
5880		long r = this.basis;
5881	<	for (int b; (b = preSplit()) > 0;)
5881	>	for (int i = baseIndex, f, h; batch > 0 &&
5882	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5883	>	addToPendingCount(1);
5884		(rights = new MapReduceMappingsToLongTask<K,V>
5885	<	(map, this, b, rights, transformer, r, reducer)).fork();
5886	<	Object v;
5887	<	while ((v = advance()) != null)
5888	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5885	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5886	>	rights, transformer, r, reducer)).fork();
5887	>	}
5888	>	for (Node<K,V> p; (p = advance()) != null; )
5889	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5890		result = r;
5891		CountedCompleter<?> c;
5892		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5893	<	MapReduceMappingsToLongTask<K,V>
5893	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5894		t = (MapReduceMappingsToLongTask<K,V>)c,
5895		s = t.rights;
5896		while (s != null) {
#	Line 6258 | Line 5902 | public class ConcurrentHashMapV8<K, V>
5902		}
5903		}
5904
5905	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5906	<	extends Traverser<K,V,Integer> {
5905	>	@SuppressWarnings("serial")
5906	>	static final class MapReduceKeysToIntTask<K,V>
5907	>	extends BulkTask<K,V,Integer> {
5908		final ObjectToInt<? super K> transformer;
5909		final IntByIntToInt reducer;
5910		final int basis;
5911		int result;
5912		MapReduceKeysToIntTask<K,V> rights, nextRight;
5913		MapReduceKeysToIntTask
5914	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5914	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5915		MapReduceKeysToIntTask<K,V> nextRight,
5916		ObjectToInt<? super K> transformer,
5917		int basis,
5918		IntByIntToInt reducer) {
5919	<	super(m, p, b); this.nextRight = nextRight;
5919	>	super(p, b, i, f, t); this.nextRight = nextRight;
5920		this.transformer = transformer;
5921		this.basis = basis; this.reducer = reducer;
5922		}
5923		public final Integer getRawResult() { return result; }
5924	<	@SuppressWarnings("unchecked") public final void compute() {
5924	>	public final void compute() {
5925		final ObjectToInt<? super K> transformer;
5926		final IntByIntToInt reducer;
5927		if ((transformer = this.transformer) != null &&
5928		(reducer = this.reducer) != null) {
5929		int r = this.basis;
5930	<	for (int b; (b = preSplit()) > 0;)
5930	>	for (int i = baseIndex, f, h; batch > 0 &&
5931	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5932	>	addToPendingCount(1);
5933		(rights = new MapReduceKeysToIntTask<K,V>
5934	<	(map, this, b, rights, transformer, r, reducer)).fork();
5935	<	while (advance() != null)
5936	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5934	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5935	>	rights, transformer, r, reducer)).fork();
5936	>	}
5937	>	for (Node<K,V> p; (p = advance()) != null; )
5938	>	r = reducer.apply(r, transformer.apply(p.key));
5939		result = r;
5940		CountedCompleter<?> c;
5941		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5942	<	MapReduceKeysToIntTask<K,V>
5942	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5943		t = (MapReduceKeysToIntTask<K,V>)c,
5944		s = t.rights;
5945		while (s != null) {
#	Line 6302 | Line 5951 | public class ConcurrentHashMapV8<K, V>
5951		}
5952		}
5953
5954	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5955	<	extends Traverser<K,V,Integer> {
5954	>	@SuppressWarnings("serial")
5955	>	static final class MapReduceValuesToIntTask<K,V>
5956	>	extends BulkTask<K,V,Integer> {
5957		final ObjectToInt<? super V> transformer;
5958		final IntByIntToInt reducer;
5959		final int basis;
5960		int result;
5961		MapReduceValuesToIntTask<K,V> rights, nextRight;
5962		MapReduceValuesToIntTask
5963	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5963	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5964		MapReduceValuesToIntTask<K,V> nextRight,
5965		ObjectToInt<? super V> transformer,
5966		int basis,
5967		IntByIntToInt reducer) {
5968	<	super(m, p, b); this.nextRight = nextRight;
5968	>	super(p, b, i, f, t); this.nextRight = nextRight;
5969		this.transformer = transformer;
5970		this.basis = basis; this.reducer = reducer;
5971		}
5972		public final Integer getRawResult() { return result; }
5973	<	@SuppressWarnings("unchecked") public final void compute() {
5973	>	public final void compute() {
5974		final ObjectToInt<? super V> transformer;
5975		final IntByIntToInt reducer;
5976		if ((transformer = this.transformer) != null &&
5977		(reducer = this.reducer) != null) {
5978		int r = this.basis;
5979	<	for (int b; (b = preSplit()) > 0;)
5979	>	for (int i = baseIndex, f, h; batch > 0 &&
5980	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5981	>	addToPendingCount(1);
5982		(rights = new MapReduceValuesToIntTask<K,V>
5983	<	(map, this, b, rights, transformer, r, reducer)).fork();
5984	<	Object v;
5985	<	while ((v = advance()) != null)
5986	<	r = reducer.apply(r, transformer.apply((V)v));
5983	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5984	>	rights, transformer, r, reducer)).fork();
5985	>	}
5986	>	for (Node<K,V> p; (p = advance()) != null; )
5987	>	r = reducer.apply(r, transformer.apply(p.val));
5988		result = r;
5989		CountedCompleter<?> c;
5990		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5991	<	MapReduceValuesToIntTask<K,V>
5991	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5992		t = (MapReduceValuesToIntTask<K,V>)c,
5993		s = t.rights;
5994		while (s != null) {
#	Line 6347 | Line 6000 | public class ConcurrentHashMapV8<K, V>
6000		}
6001		}
6002
6003	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
6004	<	extends Traverser<K,V,Integer> {
6003	>	@SuppressWarnings("serial")
6004	>	static final class MapReduceEntriesToIntTask<K,V>
6005	>	extends BulkTask<K,V,Integer> {
6006		final ObjectToInt<Map.Entry<K,V>> transformer;
6007		final IntByIntToInt reducer;
6008		final int basis;
6009		int result;
6010		MapReduceEntriesToIntTask<K,V> rights, nextRight;
6011		MapReduceEntriesToIntTask
6012	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6012	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6013		MapReduceEntriesToIntTask<K,V> nextRight,
6014		ObjectToInt<Map.Entry<K,V>> transformer,
6015		int basis,
6016		IntByIntToInt reducer) {
6017	<	super(m, p, b); this.nextRight = nextRight;
6017	>	super(p, b, i, f, t); this.nextRight = nextRight;
6018		this.transformer = transformer;
6019		this.basis = basis; this.reducer = reducer;
6020		}
6021		public final Integer getRawResult() { return result; }
6022	<	@SuppressWarnings("unchecked") public final void compute() {
6022	>	public final void compute() {
6023		final ObjectToInt<Map.Entry<K,V>> transformer;
6024		final IntByIntToInt reducer;
6025		if ((transformer = this.transformer) != null &&
6026		(reducer = this.reducer) != null) {
6027		int r = this.basis;
6028	<	for (int b; (b = preSplit()) > 0;)
6028	>	for (int i = baseIndex, f, h; batch > 0 &&
6029	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6030	>	addToPendingCount(1);
6031		(rights = new MapReduceEntriesToIntTask<K,V>
6032	<	(map, this, b, rights, transformer, r, reducer)).fork();
6033	<	Object v;
6034	<	while ((v = advance()) != null)
6035	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
6036	<	(V)v)));
6032	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6033	>	rights, transformer, r, reducer)).fork();
6034	>	}
6035	>	for (Node<K,V> p; (p = advance()) != null; )
6036	>	r = reducer.apply(r, transformer.apply(p));
6037		result = r;
6038		CountedCompleter<?> c;
6039		for (c = firstComplete(); c != null; c = c.nextComplete()) {
6040	<	MapReduceEntriesToIntTask<K,V>
6040	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
6041		t = (MapReduceEntriesToIntTask<K,V>)c,
6042		s = t.rights;
6043		while (s != null) {
#	Line 6393 | Line 6049 | public class ConcurrentHashMapV8<K, V>
6049		}
6050		}
6051
6052	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
6053	<	extends Traverser<K,V,Integer> {
6052	>	@SuppressWarnings("serial")
6053	>	static final class MapReduceMappingsToIntTask<K,V>
6054	>	extends BulkTask<K,V,Integer> {
6055		final ObjectByObjectToInt<? super K, ? super V> transformer;
6056		final IntByIntToInt reducer;
6057		final int basis;
6058		int result;
6059		MapReduceMappingsToIntTask<K,V> rights, nextRight;
6060		MapReduceMappingsToIntTask
6061	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6061	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6062		MapReduceMappingsToIntTask<K,V> nextRight,
6063		ObjectByObjectToInt<? super K, ? super V> transformer,
6064		int basis,
6065		IntByIntToInt reducer) {
6066	<	super(m, p, b); this.nextRight = nextRight;
6066	>	super(p, b, i, f, t); this.nextRight = nextRight;
6067		this.transformer = transformer;
6068		this.basis = basis; this.reducer = reducer;
6069		}
6070		public final Integer getRawResult() { return result; }
6071	<	@SuppressWarnings("unchecked") public final void compute() {
6071	>	public final void compute() {
6072		final ObjectByObjectToInt<? super K, ? super V> transformer;
6073		final IntByIntToInt reducer;
6074		if ((transformer = this.transformer) != null &&
6075		(reducer = this.reducer) != null) {
6076		int r = this.basis;
6077	<	for (int b; (b = preSplit()) > 0;)
6077	>	for (int i = baseIndex, f, h; batch > 0 &&
6078	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6079	>	addToPendingCount(1);
6080		(rights = new MapReduceMappingsToIntTask<K,V>
6081	<	(map, this, b, rights, transformer, r, reducer)).fork();
6082	<	Object v;
6083	<	while ((v = advance()) != null)
6084	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
6081	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6082	>	rights, transformer, r, reducer)).fork();
6083	>	}
6084	>	for (Node<K,V> p; (p = advance()) != null; )
6085	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
6086		result = r;
6087		CountedCompleter<?> c;
6088		for (c = firstComplete(); c != null; c = c.nextComplete()) {
6089	<	MapReduceMappingsToIntTask<K,V>
6089	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
6090		t = (MapReduceMappingsToIntTask<K,V>)c,
6091		s = t.rights;
6092		while (s != null) {
#	Line 6438 | Line 6098 | public class ConcurrentHashMapV8<K, V>
6098		}
6099		}
6100
6101	+	/* ---------------- Counters -------------- */
6102	+
6103	+	// Adapted from LongAdder and Striped64.
6104	+	// See their internal docs for explanation.
6105	+
6106	+	// A padded cell for distributing counts
6107	+	static final class CounterCell {
6108	+	volatile long p0, p1, p2, p3, p4, p5, p6;
6109	+	volatile long value;
6110	+	volatile long q0, q1, q2, q3, q4, q5, q6;
6111	+	CounterCell(long x) { value = x; }
6112	+	}
6113	+
6114	+	/**
6115	+	* Holder for the thread-local hash code determining which
6116	+	* CounterCell to use. The code is initialized via the
6117	+	* counterHashCodeGenerator, but may be moved upon collisions.
6118	+	*/
6119	+	static final class CounterHashCode {
6120	+	int code;
6121	+	}
6122	+
6123	+	/**
6124	+	* Generates initial value for per-thread CounterHashCodes.
6125	+	*/
6126	+	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
6127	+
6128	+	/**
6129	+	* Increment for counterHashCodeGenerator. See class ThreadLocal
6130	+	* for explanation.
6131	+	*/
6132	+	static final int SEED_INCREMENT = 0x61c88647;
6133	+
6134	+	/**
6135	+	* Per-thread counter hash codes. Shared across all instances.
6136	+	*/
6137	+	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
6138	+	new ThreadLocal<CounterHashCode>();
6139	+
6140	+
6141	+	final long sumCount() {
6142	+	CounterCell[] as = counterCells; CounterCell a;
6143	+	long sum = baseCount;
6144	+	if (as != null) {
6145	+	for (int i = 0; i < as.length; ++i) {
6146	+	if ((a = as[i]) != null)
6147	+	sum += a.value;
6148	+	}
6149	+	}
6150	+	return sum;
6151	+	}
6152	+
6153	+	// See LongAdder version for explanation
6154	+	private final void fullAddCount(long x, CounterHashCode hc,
6155	+	boolean wasUncontended) {
6156	+	int h;
6157	+	if (hc == null) {
6158	+	hc = new CounterHashCode();
6159	+	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
6160	+	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
6161	+	threadCounterHashCode.set(hc);
6162	+	}
6163	+	else
6164	+	h = hc.code;
6165	+	boolean collide = false;                // True if last slot nonempty
6166	+	for (;;) {
6167	+	CounterCell[] as; CounterCell a; int n; long v;
6168	+	if ((as = counterCells) != null && (n = as.length) > 0) {
6169	+	if ((a = as[(n - 1) & h]) == null) {
6170	+	if (cellsBusy == 0) {            // Try to attach new Cell
6171	+	CounterCell r = new CounterCell(x); // Optimistic create
6172	+	if (cellsBusy == 0 &&
6173	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6174	+	boolean created = false;
6175	+	try {               // Recheck under lock
6176	+	CounterCell[] rs; int m, j;
6177	+	if ((rs = counterCells) != null &&
6178	+	(m = rs.length) > 0 &&
6179	+	rs[j = (m - 1) & h] == null) {
6180	+	rs[j] = r;
6181	+	created = true;
6182	+	}
6183	+	} finally {
6184	+	cellsBusy = 0;
6185	+	}
6186	+	if (created)
6187	+	break;
6188	+	continue;           // Slot is now non-empty
6189	+	}
6190	+	}
6191	+	collide = false;
6192	+	}
6193	+	else if (!wasUncontended)       // CAS already known to fail
6194	+	wasUncontended = true;      // Continue after rehash
6195	+	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
6196	+	break;
6197	+	else if (counterCells != as || n >= NCPU)
6198	+	collide = false;            // At max size or stale
6199	+	else if (!collide)
6200	+	collide = true;
6201	+	else if (cellsBusy == 0 &&
6202	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6203	+	try {
6204	+	if (counterCells == as) {// Expand table unless stale
6205	+	CounterCell[] rs = new CounterCell[n << 1];
6206	+	for (int i = 0; i < n; ++i)
6207	+	rs[i] = as[i];
6208	+	counterCells = rs;
6209	+	}
6210	+	} finally {
6211	+	cellsBusy = 0;
6212	+	}
6213	+	collide = false;
6214	+	continue;                   // Retry with expanded table
6215	+	}
6216	+	h ^= h << 13;                   // Rehash
6217	+	h ^= h >>> 17;
6218	+	h ^= h << 5;
6219	+	}
6220	+	else if (cellsBusy == 0 && counterCells == as &&
6221	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6222	+	boolean init = false;
6223	+	try {                           // Initialize table
6224	+	if (counterCells == as) {
6225	+	CounterCell[] rs = new CounterCell[2];
6226	+	rs[h & 1] = new CounterCell(x);
6227	+	counterCells = rs;
6228	+	init = true;
6229	+	}
6230	+	} finally {
6231	+	cellsBusy = 0;
6232	+	}
6233	+	if (init)
6234	+	break;
6235	+	}
6236	+	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
6237	+	break;                          // Fall back on using base
6238	+	}
6239	+	hc.code = h;                            // Record index for next time
6240	+	}
6241	+
6242		// Unsafe mechanics
6243		private static final sun.misc.Unsafe U;
6244		private static final long SIZECTL;
6245		private static final long TRANSFERINDEX;
6445	–	private static final long TRANSFERORIGIN;
6246		private static final long BASECOUNT;
6247	<	private static final long COUNTERBUSY;
6247	>	private static final long CELLSBUSY;
6248		private static final long CELLVALUE;
6249		private static final long ABASE;
6250		private static final int ASHIFT;
6251
6252		static {
6453	–	int ss;
6253		try {
6254		U = getUnsafe();
6255		Class<?> k = ConcurrentHashMapV8.class;
#	Line 6458 | Line 6257 | public class ConcurrentHashMapV8<K, V>
6257		(k.getDeclaredField("sizeCtl"));
6258		TRANSFERINDEX = U.objectFieldOffset
6259		(k.getDeclaredField("transferIndex"));
6461	–	TRANSFERORIGIN = U.objectFieldOffset
6462	–	(k.getDeclaredField("transferOrigin"));
6260		BASECOUNT = U.objectFieldOffset
6261		(k.getDeclaredField("baseCount"));
6262	<	COUNTERBUSY = U.objectFieldOffset
6263	<	(k.getDeclaredField("counterBusy"));
6262	>	CELLSBUSY = U.objectFieldOffset
6263	>	(k.getDeclaredField("cellsBusy"));
6264		Class<?> ck = CounterCell.class;
6265		CELLVALUE = U.objectFieldOffset
6266		(ck.getDeclaredField("value"));
6267	<	Class<?> sc = Node[].class;
6268	<	ABASE = U.arrayBaseOffset(sc);
6269	<	ss = U.arrayIndexScale(sc);
6270	<	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6267	>	Class<?> ak = Node[].class;
6268	>	ABASE = U.arrayBaseOffset(ak);
6269	>	int scale = U.arrayIndexScale(ak);
6270	>	if ((scale & (scale - 1)) != 0)
6271	>	throw new Error("data type scale not a power of two");
6272	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6273		} catch (Exception e) {
6274		throw new Error(e);
6275		}
6477	–	if ((ss & (ss-1)) != 0)
6478	–	throw new Error("data type scale not a power of two");
6276		}
6277
6278		/**
#	Line 6488 | Line 6285 | public class ConcurrentHashMapV8<K, V>
6285		private static sun.misc.Unsafe getUnsafe() {
6286		try {
6287		return sun.misc.Unsafe.getUnsafe();
6288	<	} catch (SecurityException se) {
6289	<	try {
6290	<	return java.security.AccessController.doPrivileged
6291	<	(new java.security
6292	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6293	<	public sun.misc.Unsafe run() throws Exception {
6294	<	java.lang.reflect.Field f = sun.misc
6295	<	.Unsafe.class.getDeclaredField("theUnsafe");
6296	<	f.setAccessible(true);
6297	<	return (sun.misc.Unsafe) f.get(null);
6298	<	}});
6299	<	} catch (java.security.PrivilegedActionException e) {
6300	<	throw new RuntimeException("Could not initialize intrinsics",
6301	<	e.getCause());
6302	<	}
6288	>	} catch (SecurityException tryReflectionInstead) {}
6289	>	try {
6290	>	return java.security.AccessController.doPrivileged
6291	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6292	>	public sun.misc.Unsafe run() throws Exception {
6293	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6294	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6295	>	f.setAccessible(true);
6296	>	Object x = f.get(null);
6297	>	if (k.isInstance(x))
6298	>	return k.cast(x);
6299	>	}
6300	>	throw new NoSuchFieldError("the Unsafe");
6301	>	}});
6302	>	} catch (java.security.PrivilegedActionException e) {
6303	>	throw new RuntimeException("Could not initialize intrinsics",
6304	>	e.getCause());
6305		}
6306		}
6307		}

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