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Comparing jsr166/src/main/java/util/concurrent/ConcurrentHashMap.java (file contents):
Revision 1.173 by jsr166, Mon Feb 11 06:53:24 2013 UTC vs.
Revision 1.228 by jsr166, Tue Jun 18 18:39:14 2013 UTC

#	Line 5 | Line 5
5		*/
6
7		package java.util.concurrent;
8	–	import java.util.concurrent.ForkJoinPool;
9	–	import java.util.concurrent.CountedCompleter;
10	–	import java.util.function.*;
11	–	import java.util.Spliterator;
12	–	import java.util.stream.Stream;
13	–	import java.util.stream.Streams;
8
9	<	import java.util.Comparator;
9	>	import java.io.ObjectStreamField;
10	>	import java.io.Serializable;
11	>	import java.lang.reflect.ParameterizedType;
12	>	import java.lang.reflect.Type;
13		import java.util.Arrays;
17	–	import java.util.Map;
18	–	import java.util.Set;
14		import java.util.Collection;
15	<	import java.util.AbstractMap;
16	<	import java.util.AbstractSet;
17	<	import java.util.AbstractCollection;
23	<	import java.util.Hashtable;
15	>	import java.util.Comparator;
16	>	import java.util.ConcurrentModificationException;
17	>	import java.util.Enumeration;
18		import java.util.HashMap;
19	+	import java.util.Hashtable;
20		import java.util.Iterator;
21	<	import java.util.Enumeration;
27	<	import java.util.ConcurrentModificationException;
21	>	import java.util.Map;
22		import java.util.NoSuchElementException;
23	+	import java.util.Set;
24	+	import java.util.Spliterator;
25		import java.util.concurrent.ConcurrentMap;
26	<	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
31	<	import java.util.concurrent.atomic.AtomicInteger;
26	>	import java.util.concurrent.ForkJoinPool;
27		import java.util.concurrent.atomic.AtomicReference;
28	<	import java.io.Serializable;
28	>	import java.util.concurrent.locks.LockSupport;
29	>	import java.util.concurrent.locks.ReentrantLock;
30	>	import java.util.function.BiConsumer;
31	>	import java.util.function.BiFunction;
32	>	import java.util.function.BinaryOperator;
33	>	import java.util.function.Consumer;
34	>	import java.util.function.DoubleBinaryOperator;
35	>	import java.util.function.Function;
36	>	import java.util.function.IntBinaryOperator;
37	>	import java.util.function.LongBinaryOperator;
38	>	import java.util.function.ToDoubleBiFunction;
39	>	import java.util.function.ToDoubleFunction;
40	>	import java.util.function.ToIntBiFunction;
41	>	import java.util.function.ToIntFunction;
42	>	import java.util.function.ToLongBiFunction;
43	>	import java.util.function.ToLongFunction;
44	>	import java.util.stream.Stream;
45
46		/**
47		* A hash table supporting full concurrency of retrievals and
#	Line 84 | Line 95 | import java.io.Serializable;
95		* expected {@code concurrencyLevel} as an additional hint for
96		* internal sizing.  Note that using many keys with exactly the same
97		* {@code hashCode()} is a sure way to slow down performance of any
98	<	* hash table.
98	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
99	>	* this class may use comparison order among keys to help break ties.
100		*
101		* <p>A {@link Set} projection of a ConcurrentHashMap may be created
102		* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
#	Line 95 | Line 107 | import java.io.Serializable;
107		* <p>A ConcurrentHashMap can be used as scalable frequency map (a
108		* form of histogram or multiset) by using {@link
109		* java.util.concurrent.atomic.LongAdder} values and initializing via
110	<	* {@link #computeIfAbsent}. For example, to add a count to a {@code
111	<	* ConcurrentHashMap<String,LongAdder> freqs}, you can use {@code
112	<	* freqs.computeIfAbsent(k -> new LongAdder()).increment();}
110	>	* {@link #computeIfAbsent computeIfAbsent}. For example, to add a count
111	>	* to a {@code ConcurrentHashMap<String,LongAdder> freqs}, you can use
112	>	* {@code freqs.computeIfAbsent(k -> new LongAdder()).increment();}
113		*
114		* <p>This class and its views and iterators implement all of the
115		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
#	Line 106 | Line 118 | import java.io.Serializable;
118		* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
119		* does <em>not</em> allow {@code null} to be used as a key or value.
120		*
121	<	* <p>ConcurrentHashMaps support sequential and parallel operations
122	<	* bulk operations. (Parallel forms use the {@link
123	<	* ForkJoinPool#commonPool()}). Tasks that may be used in other
124	<	* contexts are available in class {@link ForkJoinTasks}. These
125	<	* operations are designed to be safely, and often sensibly, applied
126	<	* even with maps that are being concurrently updated by other
127	<	* threads; for example, when computing a snapshot summary of the
128	<	* values in a shared registry.  There are three kinds of operation,
129	<	* each with four forms, accepting functions with Keys, Values,
130	<	* Entries, and (Key, Value) arguments and/or return values. Because
131	<	* the elements of a ConcurrentHashMap are not ordered in any
132	<	* particular way, and may be processed in different orders in
133	<	* different parallel executions, the correctness of supplied
134	<	* functions should not depend on any ordering, or on any other
135	<	* objects or values that may transiently change while computation is
124	<	* in progress; and except for forEach actions, should ideally be
125	<	* side-effect-free.
121	>	* <p>ConcurrentHashMaps support a set of sequential and parallel bulk
122	>	* operations that, unlike most {@link Stream} methods, are designed
123	>	* to be safely, and often sensibly, applied even with maps that are
124	>	* being concurrently updated by other threads; for example, when
125	>	* computing a snapshot summary of the values in a shared registry.
126	>	* There are three kinds of operation, each with four forms, accepting
127	>	* functions with Keys, Values, Entries, and (Key, Value) arguments
128	>	* and/or return values. Because the elements of a ConcurrentHashMap
129	>	* are not ordered in any particular way, and may be processed in
130	>	* different orders in different parallel executions, the correctness
131	>	* of supplied functions should not depend on any ordering, or on any
132	>	* other objects or values that may transiently change while
133	>	* computation is in progress; and except for forEach actions, should
134	>	* ideally be side-effect-free. Bulk operations on {@link Map.Entry}
135	>	* objects do not support method {@code setValue}.
136		*
137		* <ul>
138		* <li> forEach: Perform a given action on each element.
#	Line 149 | Line 159 | import java.io.Serializable;
159		* <li> Reductions to scalar doubles, longs, and ints, using a
160		* given basis value.</li>
161		*
152	–	* </li>
162		* </ul>
163	+	* </li>
164		* </ul>
165		*
166	+	* <p>These bulk operations accept a {@code parallelismThreshold}
167	+	* argument. Methods proceed sequentially if the current map size is
168	+	* estimated to be less than the given threshold. Using a value of
169	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
170	+	* of {@code 1} results in maximal parallelism by partitioning into
171	+	* enough subtasks to fully utilize the {@link
172	+	* ForkJoinPool#commonPool()} that is used for all parallel
173	+	* computations. Normally, you would initially choose one of these
174	+	* extreme values, and then measure performance of using in-between
175	+	* values that trade off overhead versus throughput.
176	+	*
177		* <p>The concurrency properties of bulk operations follow
178		* from those of ConcurrentHashMap: Any non-null result returned
179		* from {@code get(key)} and related access methods bears a
#	Line 214 | Line 235 | import java.io.Serializable;
235		* @param <K> the type of keys maintained by this map
236		* @param <V> the type of mapped values
237		*/
238	<	public class ConcurrentHashMap<K, V>
218	<	implements ConcurrentMap<K, V>, Serializable {
238	>	public class ConcurrentHashMap<K,V> implements ConcurrentMap<K,V>, Serializable {
239		private static final long serialVersionUID = 7249069246763182397L;
240
241		/*
#	Line 228 | Line 248 | public class ConcurrentHashMap<K, V>
248		* the same or better than java.util.HashMap, and to support high
249		* initial insertion rates on an empty table by many threads.
250		*
251	<	* Each key-value mapping is held in a Node.  Because Node key
252	<	* fields can contain special values, they are defined using plain
253	<	* Object types (not type "K"). This leads to a lot of explicit
254	<	* casting (and many explicit warning suppressions to tell
255	<	* compilers not to complain about it). It also allows some of the
256	<	* public methods to be factored into a smaller number of internal
257	<	* methods (although sadly not so for the five variants of
258	<	* put-related operations). The validation-based approach
259	<	* explained below leads to a lot of code sprawl because
260	<	* retry-control precludes factoring into smaller methods.
251	>	* This map usually acts as a binned (bucketed) hash table.  Each
252	>	* key-value mapping is held in a Node.  Most nodes are instances
253	>	* of the basic Node class with hash, key, value, and next
254	>	* fields. However, various subclasses exist: TreeNodes are
255	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
256	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
257	>	* of bins during resizing. ReservationNodes are used as
258	>	* placeholders while establishing values in computeIfAbsent and
259	>	* related methods.  The types TreeBin, ForwardingNode, and
260	>	* ReservationNode do not hold normal user keys, values, or
261	>	* hashes, and are readily distinguishable during search etc
262	>	* because they have negative hash fields and null key and value
263	>	* fields. (These special nodes are either uncommon or transient,
264	>	* so the impact of carrying around some unused fields is
265	>	* insignficant.)
266		*
267		* The table is lazily initialized to a power-of-two size upon the
268		* first insertion.  Each bin in the table normally contains a
#	Line 245 | Line 270 | public class ConcurrentHashMap<K, V>
270		* Table accesses require volatile/atomic reads, writes, and
271		* CASes.  Because there is no other way to arrange this without
272		* adding further indirections, we use intrinsics
273	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
249	<	* are always accurately traversable under volatile reads, so long
250	<	* as lookups check hash code and non-nullness of value before
251	<	* checking key equality.
273	>	* (sun.misc.Unsafe) operations.
274		*
275		* We use the top (sign) bit of Node hash fields for control
276		* purposes -- it is available anyway because of addressing
277	<	* constraints.  Nodes with negative hash fields are forwarding
278	<	* nodes to either TreeBins or resized tables.  The lower 31 bits
257	<	* of each normal Node's hash field contain a transformation of
258	<	* the key's hash code.
277	>	* constraints.  Nodes with negative hash fields are specially
278	>	* handled or ignored in map methods.
279		*
280		* Insertion (via put or its variants) of the first node in an
281		* empty bin is performed by just CASing it to the bin.  This is
#	Line 272 | Line 292 | public class ConcurrentHashMap<K, V>
292		* validate that it is still the first node after locking it, and
293		* retry if not. Because new nodes are always appended to lists,
294		* once a node is first in a bin, it remains first until deleted
295	<	* or the bin becomes invalidated (upon resizing).  However,
276	<	* operations that only conditionally update may inspect nodes
277	<	* until the point of update. This is a converse of sorts to the
278	<	* lazy locking technique described by Herlihy & Shavit.
295	>	* or the bin becomes invalidated (upon resizing).
296		*
297		* The main disadvantage of per-bin locks is that other update
298		* operations on other nodes in a bin list protected by the same
#	Line 308 | Line 325 | public class ConcurrentHashMap<K, V>
325		* sometimes deviate significantly from uniform randomness.  This
326		* includes the case when N > (1<<30), so some keys MUST collide.
327		* Similarly for dumb or hostile usages in which multiple keys are
328	<	* designed to have identical hash codes. Also, although we guard
329	<	* against the worst effects of this (see method spread), sets of
330	<	* hashes may differ only in bits that do not impact their bin
331	<	* index for a given power-of-two mask.  So we use a secondary
332	<	* strategy that applies when the number of nodes in a bin exceeds
333	<	* a threshold, and at least one of the keys implements
317	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
318	<	* (a specialized form of red-black trees), bounding search time
319	<	* to O(log N).  Each search step in a TreeBin is around twice as
328	>	* designed to have identical hash codes or ones that differs only
329	>	* in masked-out high bits. So we use a secondary strategy that
330	>	* applies when the number of nodes in a bin exceeds a
331	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
332	>	* specialized form of red-black trees), bounding search time to
333	>	* O(log N).  Each search step in a TreeBin is at least twice as
334		* slow as in a regular list, but given that N cannot exceed
335		* (1<<64) (before running out of addresses) this bounds search
336		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 382 | Line 396 | public class ConcurrentHashMap<K, V>
396		* LongAdder. We need to incorporate a specialization rather than
397		* just use a LongAdder in order to access implicit
398		* contention-sensing that leads to creation of multiple
399	<	* Cells.  The counter mechanics avoid contention on
399	>	* CounterCells.  The counter mechanics avoid contention on
400		* updates but can encounter cache thrashing if read too
401		* frequently during concurrent access. To avoid reading so often,
402		* resizing under contention is attempted only upon adding to a
403		* bin already holding two or more nodes. Under uniform hash
404		* distributions, the probability of this occurring at threshold
405		* is around 13%, meaning that only about 1 in 8 puts check
406	<	* threshold (and after resizing, many fewer do so). The bulk
407	<	* putAll operation further reduces contention by only committing
408	<	* count updates upon these size checks.
406	>	* threshold (and after resizing, many fewer do so).
407	>	*
408	>	* TreeBins use a special form of comparison for search and
409	>	* related operations (which is the main reason we cannot use
410	>	* existing collections such as TreeMaps). TreeBins contain
411	>	* Comparable elements, but may contain others, as well as
412	>	* elements that are Comparable but not necessarily Comparable
413	>	* for the same T, so we cannot invoke compareTo among them. To
414	>	* handle this, the tree is ordered primarily by hash value, then
415	>	* by Comparable.compareTo order if applicable.  On lookup at a
416	>	* node, if elements are not comparable or compare as 0 then both
417	>	* left and right children may need to be searched in the case of
418	>	* tied hash values. (This corresponds to the full list search
419	>	* that would be necessary if all elements were non-Comparable and
420	>	* had tied hashes.)  The red-black balancing code is updated from
421	>	* pre-jdk-collections
422	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
423	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
424	>	* Algorithms" (CLR).
425	>	*
426	>	* TreeBins also require an additional locking mechanism.  While
427	>	* list traversal is always possible by readers even during
428	>	* updates, tree traversal is not, mainly beause of tree-rotations
429	>	* that may change the root node and/or its linkages.  TreeBins
430	>	* include a simple read-write lock mechanism parasitic on the
431	>	* main bin-synchronization strategy: Structural adjustments
432	>	* associated with an insertion or removal are already bin-locked
433	>	* (and so cannot conflict with other writers) but must wait for
434	>	* ongoing readers to finish. Since there can be only one such
435	>	* waiter, we use a simple scheme using a single "waiter" field to
436	>	* block writers.  However, readers need never block.  If the root
437	>	* lock is held, they proceed along the slow traversal path (via
438	>	* next-pointers) until the lock becomes available or the list is
439	>	* exhausted, whichever comes first. These cases are not fast, but
440	>	* maximize aggregate expected throughput.
441		*
442		* Maintaining API and serialization compatibility with previous
443		* versions of this class introduces several oddities. Mainly: We
#	Line 401 | Line 447 | public class ConcurrentHashMap<K, V>
447		* time that we can guarantee to honor it.) We also declare an
448		* unused "Segment" class that is instantiated in minimal form
449		* only when serializing.
450	+	*
451	+	* This file is organized to make things a little easier to follow
452	+	* while reading than they might otherwise: First the main static
453	+	* declarations and utilities, then fields, then main public
454	+	* methods (with a few factorings of multiple public methods into
455	+	* internal ones), then sizing methods, trees, traversers, and
456	+	* bulk operations.
457		*/
458
459		/* ---------------- Constants -------------- */
#	Line 443 | Line 496 | public class ConcurrentHashMap<K, V>
496
497		/**
498		* The bin count threshold for using a tree rather than list for a
499	<	* bin.  The value reflects the approximate break-even point for
500	<	* using tree-based operations.
499	>	* bin.  Bins are converted to trees when adding an element to a
500	>	* bin with at least this many nodes. The value must be greater
501	>	* than 2, and should be at least 8 to mesh with assumptions in
502	>	* tree removal about conversion back to plain bins upon
503	>	* shrinkage.
504	>	*/
505	>	static final int TREEIFY_THRESHOLD = 8;
506	>
507	>	/**
508	>	* The bin count threshold for untreeifying a (split) bin during a
509	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
510	>	* most 6 to mesh with shrinkage detection under removal.
511		*/
512	<	private static final int TREE_THRESHOLD = 8;
512	>	static final int UNTREEIFY_THRESHOLD = 6;
513	>
514	>	/**
515	>	* The smallest table capacity for which bins may be treeified.
516	>	* (Otherwise the table is resized if too many nodes in a bin.)
517	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
518	>	* conflicts between resizing and treeification thresholds.
519	>	*/
520	>	static final int MIN_TREEIFY_CAPACITY = 64;
521
522		/**
523		* Minimum number of rebinnings per transfer step. Ranges are
#	Line 460 | Line 531 | public class ConcurrentHashMap<K, V>
531		/*
532		* Encodings for Node hash fields. See above for explanation.
533		*/
534	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
534	>	static final int MOVED     = 0x8fffffff; // (-1) hash for forwarding nodes
535	>	static final int TREEBIN   = 0x80000000; // hash for heads of treea
536	>	static final int RESERVED  = 0x80000001; // hash for transient reservations
537		static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
538
539		/** Number of CPUS, to place bounds on some sizings */
540		static final int NCPU = Runtime.getRuntime().availableProcessors();
541
542	<	/* ---------------- Counters -------------- */
542	>	/** For serialization compatibility. */
543	>	private static final ObjectStreamField[] serialPersistentFields = {
544	>	new ObjectStreamField("segments", Segment[].class),
545	>	new ObjectStreamField("segmentMask", Integer.TYPE),
546	>	new ObjectStreamField("segmentShift", Integer.TYPE)
547	>	};
548
549	<	// Adapted from LongAdder and Striped64.
472	<	// See their internal docs for explanation.
549	>	/* ---------------- Nodes -------------- */
550
551	<	// A padded cell for distributing counts
552	<	static final class Cell {
553	<	volatile long p0, p1, p2, p3, p4, p5, p6;
554	<	volatile long value;
555	<	volatile long q0, q1, q2, q3, q4, q5, q6;
556	<	Cell(long x) { value = x; }
551	>	/**
552	>	* Key-value entry.  This class is never exported out as a
553	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
554	>	* MapEntry below), but can be used for read-only traversals used
555	>	* in bulk tasks.  Subclasses of Node with a negativehash field
556	>	* are special, and contain null keys and values (but are never
557	>	* exported).  Otherwise, keys and vals are never null.
558	>	*/
559	>	static class Node<K,V> implements Map.Entry<K,V> {
560	>	final int hash;
561	>	final K key;
562	>	volatile V val;
563	>	Node<K,V> next;
564	>
565	>	Node(int hash, K key, V val, Node<K,V> next) {
566	>	this.hash = hash;
567	>	this.key = key;
568	>	this.val = val;
569	>	this.next = next;
570	>	}
571	>
572	>	public final K getKey()       { return key; }
573	>	public final V getValue()     { return val; }
574	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
575	>	public final String toString(){ return key + "=" + val; }
576	>	public final V setValue(V value) {
577	>	throw new UnsupportedOperationException();
578	>	}
579	>
580	>	public final boolean equals(Object o) {
581	>	Object k, v, u; Map.Entry<?,?> e;
582	>	return ((o instanceof Map.Entry) &&
583	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
584	>	(v = e.getValue()) != null &&
585	>	(k == key || k.equals(key)) &&
586	>	(v == (u = val) || v.equals(u)));
587	>	}
588	>
589	>	/**
590	>	* Virtualized support for map.get(); overridden in subclasses.
591	>	*/
592	>	Node<K,V> find(int h, Object k) {
593	>	Node<K,V> e = this;
594	>	if (k != null) {
595	>	do {
596	>	K ek;
597	>	if (e.hash == h &&
598	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
599	>	return e;
600	>	} while ((e = e.next) != null);
601	>	}
602	>	return null;
603	>	}
604	>	}
605	>
606	>	/* ---------------- Static utilities -------------- */
607	>
608	>	/**
609	>	* Spreads (XORs) higher bits of hash to lower and also forces top
610	>	* bit to 0. Because the table uses power-of-two masking, sets of
611	>	* hashes that vary only in bits above the current mask will
612	>	* always collide. (Among known examples are sets of Float keys
613	>	* holding consecutive whole numbers in small tables.)  So we
614	>	* apply a transform that spreads the impact of higher bits
615	>	* downward. There is a tradeoff between speed, utility, and
616	>	* quality of bit-spreading. Because many common sets of hashes
617	>	* are already reasonably distributed (so don't benefit from
618	>	* spreading), and because we use trees to handle large sets of
619	>	* collisions in bins, we just XOR some shifted bits in the
620	>	* cheapest possible way to reduce systematic lossage, as well as
621	>	* to incorporate impact of the highest bits that would otherwise
622	>	* never be used in index calculations because of table bounds.
623	>	*/
624	>	static final int spread(int h) {
625	>	return (h ^ (h >>> 16)) & HASH_BITS;
626	>	}
627	>
628	>	/**
629	>	* Returns a power of two table size for the given desired capacity.
630	>	* See Hackers Delight, sec 3.2
631	>	*/
632	>	private static final int tableSizeFor(int c) {
633	>	int n = c - 1;
634	>	n |= n >>> 1;
635	>	n |= n >>> 2;
636	>	n |= n >>> 4;
637	>	n |= n >>> 8;
638	>	n |= n >>> 16;
639	>	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
640	>	}
641	>
642	>	/**
643	>	* Returns x's Class if it is of the form "class C implements
644	>	* Comparable<C>", else null.
645	>	*/
646	>	static Class<?> comparableClassFor(Object x) {
647	>	if (x instanceof Comparable) {
648	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
649	>	if ((c = x.getClass()) == String.class) // bypass checks
650	>	return c;
651	>	if ((ts = c.getGenericInterfaces()) != null) {
652	>	for (int i = 0; i < ts.length; ++i) {
653	>	if (((t = ts[i]) instanceof ParameterizedType) &&
654	>	((p = (ParameterizedType)t).getRawType() ==
655	>	Comparable.class) &&
656	>	(as = p.getActualTypeArguments()) != null &&
657	>	as.length == 1 && as[0] == c) // type arg is c
658	>	return c;
659	>	}
660	>	}
661	>	}
662	>	return null;
663	>	}
664	>
665	>	/**
666	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
667	>	* class), else 0.
668	>	*/
669	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
670	>	static int compareComparables(Class<?> kc, Object k, Object x) {
671	>	return (x == null || x.getClass() != kc ? 0 :
672	>	((Comparable)k).compareTo(x));
673	>	}
674	>
675	>	/* ---------------- Table element access -------------- */
676	>
677	>	/*
678	>	* Volatile access methods are used for table elements as well as
679	>	* elements of in-progress next table while resizing.  All uses of
680	>	* the tab arguments must be null checked by callers.  All callers
681	>	* also paranoically precheck that tab's length is not zero (or an
682	>	* equivalent check), thus ensuring that any index argument taking
683	>	* the form of a hash value anded with (length - 1) is a valid
684	>	* index.  Note that, to be correct wrt arbitrary concurrency
685	>	* errors by users, these checks must operate on local variables,
686	>	* which accounts for some odd-looking inline assignments below.
687	>	* Note that calls to setTabAt always occur within locked regions,
688	>	* and so do not need full volatile semantics, but still require
689	>	* ordering to maintain concurrent readability.
690	>	*/
691	>
692	>	@SuppressWarnings("unchecked")
693	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
694	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
695	>	}
696	>
697	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
698	>	Node<K,V> c, Node<K,V> v) {
699	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
700	>	}
701	>
702	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
703	>	U.putOrderedObject(tab, ((long)i << ASHIFT) + ABASE, v);
704		}
705
706		/* ---------------- Fields -------------- */
#	Line 485 | Line 709 | public class ConcurrentHashMap<K, V>
709		* The array of bins. Lazily initialized upon first insertion.
710		* Size is always a power of two. Accessed directly by iterators.
711		*/
712	<	transient volatile Node<V>[] table;
712	>	transient volatile Node<K,V>[] table;
713
714		/**
715		* The next table to use; non-null only while resizing.
716		*/
717	<	private transient volatile Node<V>[] nextTable;
717	>	private transient volatile Node<K,V>[] nextTable;
718
719		/**
720		* Base counter value, used mainly when there is no contention,
#	Line 520 | Line 744 | public class ConcurrentHashMap<K, V>
744		private transient volatile int transferOrigin;
745
746		/**
747	<	* Spinlock (locked via CAS) used when resizing and/or creating Cells.
747	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
748		*/
749		private transient volatile int cellsBusy;
750
751		/**
752		* Table of counter cells. When non-null, size is a power of 2.
753		*/
754	<	private transient volatile Cell[] counterCells;
754	>	private transient volatile CounterCell[] counterCells;
755
756		// views
757		private transient KeySetView<K,V> keySet;
758		private transient ValuesView<K,V> values;
759		private transient EntrySetView<K,V> entrySet;
760
537	–	/** For serialization compatibility. Null unless serialized; see below */
538	–	private Segment<K,V>[] segments;
761
762	<	/* ---------------- Table element access -------------- */
762	>	/* ---------------- Public operations -------------- */
763
764	<	/*
765	<	* Volatile access methods are used for table elements as well as
766	<	* elements of in-progress next table while resizing.  Uses are
767	<	* null checked by callers, and implicitly bounds-checked, relying
546	<	* on the invariants that tab arrays have non-zero size, and all
547	<	* indices are masked with (tab.length - 1) which is never
548	<	* negative and always less than length. Note that, to be correct
549	<	* wrt arbitrary concurrency errors by users, bounds checks must
550	<	* operate on local variables, which accounts for some odd-looking
551	<	* inline assignments below.
552	<	*/
553	<
554	<	@SuppressWarnings("unchecked") static final <V> Node<V> tabAt
555	<	(Node<V>[] tab, int i) { // used by Traverser
556	<	return (Node<V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
764	>	/**
765	>	* Creates a new, empty map with the default initial table size (16).
766	>	*/
767	>	public ConcurrentHashMap() {
768		}
769
770	<	private static final <V> boolean casTabAt
771	<	(Node<V>[] tab, int i, Node<V> c, Node<V> v) {
772	<	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
770	>	/**
771	>	* Creates a new, empty map with an initial table size
772	>	* accommodating the specified number of elements without the need
773	>	* to dynamically resize.
774	>	*
775	>	* @param initialCapacity The implementation performs internal
776	>	* sizing to accommodate this many elements.
777	>	* @throws IllegalArgumentException if the initial capacity of
778	>	* elements is negative
779	>	*/
780	>	public ConcurrentHashMap(int initialCapacity) {
781	>	if (initialCapacity < 0)
782	>	throw new IllegalArgumentException();
783	>	int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
784	>	MAXIMUM_CAPACITY :
785	>	tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
786	>	this.sizeCtl = cap;
787		}
788
789	<	private static final <V> void setTabAt
790	<	(Node<V>[] tab, int i, Node<V> v) {
791	<	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
789	>	/**
790	>	* Creates a new map with the same mappings as the given map.
791	>	*
792	>	* @param m the map
793	>	*/
794	>	public ConcurrentHashMap(Map<? extends K, ? extends V> m) {
795	>	this.sizeCtl = DEFAULT_CAPACITY;
796	>	putAll(m);
797		}
798
569	–	/* ---------------- Nodes -------------- */
570	–
799		/**
800	<	* Key-value entry. Note that this is never exported out as a
801	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
802	<	* field of MOVED are special, and do not contain user keys or
803	<	* values.  Otherwise, keys are never null, and null val fields
804	<	* indicate that a node is in the process of being deleted or
805	<	* created. For purposes of read-only access, a key may be read
806	<	* before a val, but can only be used after checking val to be
807	<	* non-null.
800	>	* Creates a new, empty map with an initial table size based on
801	>	* the given number of elements ({@code initialCapacity}) and
802	>	* initial table density ({@code loadFactor}).
803	>	*
804	>	* @param initialCapacity the initial capacity. The implementation
805	>	* performs internal sizing to accommodate this many elements,
806	>	* given the specified load factor.
807	>	* @param loadFactor the load factor (table density) for
808	>	* establishing the initial table size
809	>	* @throws IllegalArgumentException if the initial capacity of
810	>	* elements is negative or the load factor is nonpositive
811	>	*
812	>	* @since 1.6
813		*/
814	<	static class Node<V> {
815	<	final int hash;
816	<	final Object key;
584	<	volatile V val;
585	<	volatile Node<V> next;
814	>	public ConcurrentHashMap(int initialCapacity, float loadFactor) {
815	>	this(initialCapacity, loadFactor, 1);
816	>	}
817
818	<	Node(int hash, Object key, V val, Node<V> next) {
819	<	this.hash = hash;
820	<	this.key = key;
821	<	this.val = val;
822	<	this.next = next;
823	<	}
818	>	/**
819	>	* Creates a new, empty map with an initial table size based on
820	>	* the given number of elements ({@code initialCapacity}), table
821	>	* density ({@code loadFactor}), and number of concurrently
822	>	* updating threads ({@code concurrencyLevel}).
823	>	*
824	>	* @param initialCapacity the initial capacity. The implementation
825	>	* performs internal sizing to accommodate this many elements,
826	>	* given the specified load factor.
827	>	* @param loadFactor the load factor (table density) for
828	>	* establishing the initial table size
829	>	* @param concurrencyLevel the estimated number of concurrently
830	>	* updating threads. The implementation may use this value as
831	>	* a sizing hint.
832	>	* @throws IllegalArgumentException if the initial capacity is
833	>	* negative or the load factor or concurrencyLevel are
834	>	* nonpositive
835	>	*/
836	>	public ConcurrentHashMap(int initialCapacity,
837	>	float loadFactor, int concurrencyLevel) {
838	>	if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
839	>	throw new IllegalArgumentException();
840	>	if (initialCapacity < concurrencyLevel)   // Use at least as many bins
841	>	initialCapacity = concurrencyLevel;   // as estimated threads
842	>	long size = (long)(1.0 + (long)initialCapacity / loadFactor);
843	>	int cap = (size >= (long)MAXIMUM_CAPACITY) ?
844	>	MAXIMUM_CAPACITY : tableSizeFor((int)size);
845	>	this.sizeCtl = cap;
846		}
847
848	<	/* ---------------- TreeBins -------------- */
848	>	// Original (since JDK1.2) Map methods
849
850		/**
851	<	* Nodes for use in TreeBins
851	>	* {@inheritDoc}
852		*/
853	<	static final class TreeNode<V> extends Node<V> {
854	<	TreeNode<V> parent;  // red-black tree links
855	<	TreeNode<V> left;
856	<	TreeNode<V> right;
857	<	TreeNode<V> prev;    // needed to unlink next upon deletion
858	<	boolean red;
853	>	public int size() {
854	>	long n = sumCount();
855	>	return ((n < 0L) ? 0 :
856	>	(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
857	>	(int)n);
858	>	}
859
860	<	TreeNode(int hash, Object key, V val, Node<V> next, TreeNode<V> parent) {
861	<	super(hash, key, val, next);
862	<	this.parent = parent;
863	<	}
860	>	/**
861	>	* {@inheritDoc}
862	>	*/
863	>	public boolean isEmpty() {
864	>	return sumCount() <= 0L; // ignore transient negative values
865		}
866
867		/**
868	<	* A specialized form of red-black tree for use in bins
869	<	* whose size exceeds a threshold.
868	>	* Returns the value to which the specified key is mapped,
869	>	* or {@code null} if this map contains no mapping for the key.
870		*
871	<	* TreeBins use a special form of comparison for search and
872	<	* related operations (which is the main reason we cannot use
873	<	* existing collections such as TreeMaps). TreeBins contain
874	<	* Comparable elements, but may contain others, as well as
621	<	* elements that are Comparable but not necessarily Comparable<T>
622	<	* for the same T, so we cannot invoke compareTo among them. To
623	<	* handle this, the tree is ordered primarily by hash value, then
624	<	* by getClass().getName() order, and then by Comparator order
625	<	* among elements of the same class.  On lookup at a node, if
626	<	* elements are not comparable or compare as 0, both left and
627	<	* right children may need to be searched in the case of tied hash
628	<	* values. (This corresponds to the full list search that would be
629	<	* necessary if all elements were non-Comparable and had tied
630	<	* hashes.)  The red-black balancing code is updated from
631	<	* pre-jdk-collections
632	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
633	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
634	<	* Algorithms" (CLR).
871	>	* <p>More formally, if this map contains a mapping from a key
872	>	* {@code k} to a value {@code v} such that {@code key.equals(k)},
873	>	* then this method returns {@code v}; otherwise it returns
874	>	* {@code null}.  (There can be at most one such mapping.)
875		*
876	<	* TreeBins also maintain a separate locking discipline than
637	<	* regular bins. Because they are forwarded via special MOVED
638	<	* nodes at bin heads (which can never change once established),
639	<	* we cannot use those nodes as locks. Instead, TreeBin
640	<	* extends AbstractQueuedSynchronizer to support a simple form of
641	<	* read-write lock. For update operations and table validation,
642	<	* the exclusive form of lock behaves in the same way as bin-head
643	<	* locks. However, lookups use shared read-lock mechanics to allow
644	<	* multiple readers in the absence of writers.  Additionally,
645	<	* these lookups do not ever block: While the lock is not
646	<	* available, they proceed along the slow traversal path (via
647	<	* next-pointers) until the lock becomes available or the list is
648	<	* exhausted, whichever comes first. (These cases are not fast,
649	<	* but maximize aggregate expected throughput.)  The AQS mechanics
650	<	* for doing this are straightforward.  The lock state is held as
651	<	* AQS getState().  Read counts are negative; the write count (1)
652	<	* is positive.  There are no signalling preferences among readers
653	<	* and writers. Since we don't need to export full Lock API, we
654	<	* just override the minimal AQS methods and use them directly.
876	>	* @throws NullPointerException if the specified key is null
877		*/
878	<	static final class TreeBin<V> extends AbstractQueuedSynchronizer {
879	<	private static final long serialVersionUID = 2249069246763182397L;
880	<	transient TreeNode<V> root;  // root of tree
881	<	transient TreeNode<V> first; // head of next-pointer list
882	<
883	<	/* AQS overrides */
884	<	public final boolean isHeldExclusively() { return getState() > 0; }
885	<	public final boolean tryAcquire(int ignore) {
886	<	if (compareAndSetState(0, 1)) {
887	<	setExclusiveOwnerThread(Thread.currentThread());
888	<	return true;
889	<	}
890	<	return false;
891	<	}
892	<	public final boolean tryRelease(int ignore) {
671	<	setExclusiveOwnerThread(null);
672	<	setState(0);
673	<	return true;
674	<	}
675	<	public final int tryAcquireShared(int ignore) {
676	<	for (int c;;) {
677	<	if ((c = getState()) > 0)
678	<	return -1;
679	<	if (compareAndSetState(c, c -1))
680	<	return 1;
681	<	}
682	<	}
683	<	public final boolean tryReleaseShared(int ignore) {
684	<	int c;
685	<	do {} while (!compareAndSetState(c = getState(), c + 1));
686	<	return c == -1;
687	<	}
688	<
689	<	/** From CLR */
690	<	private void rotateLeft(TreeNode<V> p) {
691	<	if (p != null) {
692	<	TreeNode<V> r = p.right, pp, rl;
693	<	if ((rl = p.right = r.left) != null)
694	<	rl.parent = p;
695	<	if ((pp = r.parent = p.parent) == null)
696	<	root = r;
697	<	else if (pp.left == p)
698	<	pp.left = r;
699	<	else
700	<	pp.right = r;
701	<	r.left = p;
702	<	p.parent = r;
703	<	}
704	<	}
705	<
706	<	/** From CLR */
707	<	private void rotateRight(TreeNode<V> p) {
708	<	if (p != null) {
709	<	TreeNode<V> l = p.left, pp, lr;
710	<	if ((lr = p.left = l.right) != null)
711	<	lr.parent = p;
712	<	if ((pp = l.parent = p.parent) == null)
713	<	root = l;
714	<	else if (pp.right == p)
715	<	pp.right = l;
716	<	else
717	<	pp.left = l;
718	<	l.right = p;
719	<	p.parent = l;
878	>	public V get(Object key) {
879	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
880	>	int h = spread(key.hashCode());
881	>	if ((tab = table) != null && (n = tab.length) > 0 &&
882	>	(e = tabAt(tab, (n - 1) & h)) != null) {
883	>	if ((eh = e.hash) == h) {
884	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
885	>	return e.val;
886	>	}
887	>	else if (eh < 0)
888	>	return (p = e.find(h, key)) != null ? p.val : null;
889	>	while ((e = e.next) != null) {
890	>	if (e.hash == h &&
891	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
892	>	return e.val;
893		}
894		}
895	+	return null;
896	+	}
897
898	<	/**
899	<	* Returns the TreeNode (or null if not found) for the given key
900	<	* starting at given root.
901	<	*/
902	<	@SuppressWarnings("unchecked") final TreeNode<V> getTreeNode
903	<	(int h, Object k, TreeNode<V> p) {
904	<	Class<?> c = k.getClass();
905	<	while (p != null) {
906	<	int dir, ph;  Object pk; Class<?> pc;
907	<	if ((ph = p.hash) == h) {
908	<	if ((pk = p.key) == k || k.equals(pk))
909	<	return p;
735	<	if (c != (pc = pk.getClass()) ||
736	<	!(k instanceof Comparable) ||
737	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
738	<	if ((dir = (c == pc) ? 0 :
739	<	c.getName().compareTo(pc.getName())) == 0) {
740	<	TreeNode<V> r = null, pl, pr; // check both sides
741	<	if ((pr = p.right) != null && h >= pr.hash &&
742	<	(r = getTreeNode(h, k, pr)) != null)
743	<	return r;
744	<	else if ((pl = p.left) != null && h <= pl.hash)
745	<	dir = -1;
746	<	else // nothing there
747	<	return null;
748	<	}
749	<	}
750	<	}
751	<	else
752	<	dir = (h < ph) ? -1 : 1;
753	<	p = (dir > 0) ? p.right : p.left;
754	<	}
755	<	return null;
756	<	}
898	>	/**
899	>	* Tests if the specified object is a key in this table.
900	>	*
901	>	* @param  key possible key
902	>	* @return {@code true} if and only if the specified object
903	>	*         is a key in this table, as determined by the
904	>	*         {@code equals} method; {@code false} otherwise
905	>	* @throws NullPointerException if the specified key is null
906	>	*/
907	>	public boolean containsKey(Object key) {
908	>	return get(key) != null;
909	>	}
910
911	<	/**
912	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
913	<	* read-lock to call getTreeNode, but during failure to get
914	<	* lock, searches along next links.
915	<	*/
916	<	final V getValue(int h, Object k) {
917	<	Node<V> r = null;
918	<	int c = getState(); // Must read lock state first
919	<	for (Node<V> e = first; e != null; e = e.next) {
920	<	if (c <= 0 && compareAndSetState(c, c - 1)) {
921	<	try {
922	<	r = getTreeNode(h, k, root);
923	<	} finally {
924	<	releaseShared(0);
925	<	}
926	<	break;
927	<	}
928	<	else if (e.hash == h && k.equals(e.key)) {
929	<	r = e;
930	<	break;
778	<	}
779	<	else
780	<	c = getState();
911	>	/**
912	>	* Returns {@code true} if this map maps one or more keys to the
913	>	* specified value. Note: This method may require a full traversal
914	>	* of the map, and is much slower than method {@code containsKey}.
915	>	*
916	>	* @param value value whose presence in this map is to be tested
917	>	* @return {@code true} if this map maps one or more keys to the
918	>	*         specified value
919	>	* @throws NullPointerException if the specified value is null
920	>	*/
921	>	public boolean containsValue(Object value) {
922	>	if (value == null)
923	>	throw new NullPointerException();
924	>	Node<K,V>[] t;
925	>	if ((t = table) != null) {
926	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
927	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
928	>	V v;
929	>	if ((v = p.val) == value || (v != null && value.equals(v)))
930	>	return true;
931		}
782	–	return r == null ? null : r.val;
932		}
933	+	return false;
934	+	}
935
936	<	/**
937	<	* Finds or adds a node.
938	<	* @return null if added
939	<	*/
940	<	@SuppressWarnings("unchecked") final TreeNode<V> putTreeNode
941	<	(int h, Object k, V v) {
942	<	Class<?> c = k.getClass();
943	<	TreeNode<V> pp = root, p = null;
944	<	int dir = 0;
945	<	while (pp != null) { // find existing node or leaf to insert at
946	<	int ph;  Object pk; Class<?> pc;
947	<	p = pp;
948	<	if ((ph = p.hash) == h) {
949	<	if ((pk = p.key) == k || k.equals(pk))
950	<	return p;
951	<	if (c != (pc = pk.getClass()) ||
801	<	!(k instanceof Comparable) ||
802	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
803	<	TreeNode<V> s = null, r = null, pr;
804	<	if ((dir = (c == pc) ? 0 :
805	<	c.getName().compareTo(pc.getName())) == 0) {
806	<	if ((pr = p.right) != null && h >= pr.hash &&
807	<	(r = getTreeNode(h, k, pr)) != null)
808	<	return r;
809	<	else // continue left
810	<	dir = -1;
811	<	}
812	<	else if ((pr = p.right) != null && h >= pr.hash)
813	<	s = pr;
814	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
815	<	return r;
816	<	}
817	<	}
818	<	else
819	<	dir = (h < ph) ? -1 : 1;
820	<	pp = (dir > 0) ? p.right : p.left;
821	<	}
822	<
823	<	TreeNode<V> f = first;
824	<	TreeNode<V> x = first = new TreeNode<V>(h, k, v, f, p);
825	<	if (p == null)
826	<	root = x;
827	<	else { // attach and rebalance; adapted from CLR
828	<	TreeNode<V> xp, xpp;
829	<	if (f != null)
830	<	f.prev = x;
831	<	if (dir <= 0)
832	<	p.left = x;
833	<	else
834	<	p.right = x;
835	<	x.red = true;
836	<	while (x != null && (xp = x.parent) != null && xp.red &&
837	<	(xpp = xp.parent) != null) {
838	<	TreeNode<V> xppl = xpp.left;
839	<	if (xp == xppl) {
840	<	TreeNode<V> y = xpp.right;
841	<	if (y != null && y.red) {
842	<	y.red = false;
843	<	xp.red = false;
844	<	xpp.red = true;
845	<	x = xpp;
846	<	}
847	<	else {
848	<	if (x == xp.right) {
849	<	rotateLeft(x = xp);
850	<	xpp = (xp = x.parent) == null ? null : xp.parent;
851	<	}
852	<	if (xp != null) {
853	<	xp.red = false;
854	<	if (xpp != null) {
855	<	xpp.red = true;
856	<	rotateRight(xpp);
857	<	}
858	<	}
859	<	}
860	<	}
861	<	else {
862	<	TreeNode<V> y = xppl;
863	<	if (y != null && y.red) {
864	<	y.red = false;
865	<	xp.red = false;
866	<	xpp.red = true;
867	<	x = xpp;
868	<	}
869	<	else {
870	<	if (x == xp.left) {
871	<	rotateRight(x = xp);
872	<	xpp = (xp = x.parent) == null ? null : xp.parent;
873	<	}
874	<	if (xp != null) {
875	<	xp.red = false;
876	<	if (xpp != null) {
877	<	xpp.red = true;
878	<	rotateLeft(xpp);
879	<	}
880	<	}
881	<	}
882	<	}
883	<	}
884	<	TreeNode<V> r = root;
885	<	if (r != null && r.red)
886	<	r.red = false;
887	<	}
888	<	return null;
889	<	}
936	>	/**
937	>	* Maps the specified key to the specified value in this table.
938	>	* Neither the key nor the value can be null.
939	>	*
940	>	* <p>The value can be retrieved by calling the {@code get} method
941	>	* with a key that is equal to the original key.
942	>	*
943	>	* @param key key with which the specified value is to be associated
944	>	* @param value value to be associated with the specified key
945	>	* @return the previous value associated with {@code key}, or
946	>	*         {@code null} if there was no mapping for {@code key}
947	>	* @throws NullPointerException if the specified key or value is null
948	>	*/
949	>	public V put(K key, V value) {
950	>	return putVal(key, value, false);
951	>	}
952
953	<	/**
954	<	* Removes the given node, that must be present before this
955	<	* call.  This is messier than typical red-black deletion code
956	<	* because we cannot swap the contents of an interior node
957	<	* with a leaf successor that is pinned by "next" pointers
958	<	* that are accessible independently of lock. So instead we
959	<	* swap the tree linkages.
960	<	*/
961	<	final void deleteTreeNode(TreeNode<V> p) {
962	<	TreeNode<V> next = (TreeNode<V>)p.next; // unlink traversal pointers
963	<	TreeNode<V> pred = p.prev;
964	<	if (pred == null)
965	<	first = next;
904	<	else
905	<	pred.next = next;
906	<	if (next != null)
907	<	next.prev = pred;
908	<	TreeNode<V> replacement;
909	<	TreeNode<V> pl = p.left;
910	<	TreeNode<V> pr = p.right;
911	<	if (pl != null && pr != null) {
912	<	TreeNode<V> s = pr, sl;
913	<	while ((sl = s.left) != null) // find successor
914	<	s = sl;
915	<	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
916	<	TreeNode<V> sr = s.right;
917	<	TreeNode<V> pp = p.parent;
918	<	if (s == pr) { // p was s's direct parent
919	<	p.parent = s;
920	<	s.right = p;
921	<	}
922	<	else {
923	<	TreeNode<V> sp = s.parent;
924	<	if ((p.parent = sp) != null) {
925	<	if (s == sp.left)
926	<	sp.left = p;
927	<	else
928	<	sp.right = p;
929	<	}
930	<	if ((s.right = pr) != null)
931	<	pr.parent = s;
932	<	}
933	<	p.left = null;
934	<	if ((p.right = sr) != null)
935	<	sr.parent = p;
936	<	if ((s.left = pl) != null)
937	<	pl.parent = s;
938	<	if ((s.parent = pp) == null)
939	<	root = s;
940	<	else if (p == pp.left)
941	<	pp.left = s;
942	<	else
943	<	pp.right = s;
944	<	replacement = sr;
945	<	}
946	<	else
947	<	replacement = (pl != null) ? pl : pr;
948	<	TreeNode<V> pp = p.parent;
949	<	if (replacement == null) {
950	<	if (pp == null) {
951	<	root = null;
952	<	return;
953	<	}
954	<	replacement = p;
953	>	/** Implementation for put and putIfAbsent */
954	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
955	>	if (key == null || value == null) throw new NullPointerException();
956	>	int hash = spread(key.hashCode());
957	>	int binCount = 0;
958	>	for (Node<K,V>[] tab = table;;) {
959	>	Node<K,V> f; int n, i, fh;
960	>	if (tab == null || (n = tab.length) == 0)
961	>	tab = initTable();
962	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
963	>	if (casTabAt(tab, i, null,
964	>	new Node<K,V>(hash, key, value, null)))
965	>	break;                   // no lock when adding to empty bin
966		}
967	+	else if ((fh = f.hash) == MOVED)
968	+	tab = helpTransfer(tab, f);
969		else {
970	<	replacement.parent = pp;
971	<	if (pp == null)
972	<	root = replacement;
973	<	else if (p == pp.left)
974	<	pp.left = replacement;
975	<	else
976	<	pp.right = replacement;
977	<	p.left = p.right = p.parent = null;
978	<	}
979	<	if (!p.red) { // rebalance, from CLR
980	<	TreeNode<V> x = replacement;
981	<	while (x != null) {
982	<	TreeNode<V> xp, xpl;
983	<	if (x.red || (xp = x.parent) == null) {
971	<	x.red = false;
972	<	break;
973	<	}
974	<	if (x == (xpl = xp.left)) {
975	<	TreeNode<V> sib = xp.right;
976	<	if (sib != null && sib.red) {
977	<	sib.red = false;
978	<	xp.red = true;
979	<	rotateLeft(xp);
980	<	sib = (xp = x.parent) == null ? null : xp.right;
981	<	}
982	<	if (sib == null)
983	<	x = xp;
984	<	else {
985	<	TreeNode<V> sl = sib.left, sr = sib.right;
986	<	if ((sr == null || !sr.red) &&
987	<	(sl == null || !sl.red)) {
988	<	sib.red = true;
989	<	x = xp;
990	<	}
991	<	else {
992	<	if (sr == null || !sr.red) {
993	<	if (sl != null)
994	<	sl.red = false;
995	<	sib.red = true;
996	<	rotateRight(sib);
997	<	sib = (xp = x.parent) == null ?
998	<	null : xp.right;
999	<	}
1000	<	if (sib != null) {
1001	<	sib.red = (xp == null) ? false : xp.red;
1002	<	if ((sr = sib.right) != null)
1003	<	sr.red = false;
970	>	V oldVal = null;
971	>	synchronized (f) {
972	>	if (tabAt(tab, i) == f) {
973	>	if (fh >= 0) {
974	>	binCount = 1;
975	>	for (Node<K,V> e = f;; ++binCount) {
976	>	K ek;
977	>	if (e.hash == hash &&
978	>	((ek = e.key) == key ||
979	>	(ek != null && key.equals(ek)))) {
980	>	oldVal = e.val;
981	>	if (!onlyIfAbsent)
982	>	e.val = value;
983	>	break;
984		}
985	<	if (xp != null) {
986	<	xp.red = false;
987	<	rotateLeft(xp);
985	>	Node<K,V> pred = e;
986	>	if ((e = e.next) == null) {
987	>	pred.next = new Node<K,V>(hash, key,
988	>	value, null);
989	>	break;
990		}
1009	–	x = root;
991		}
992		}
993	<	}
994	<	else { // symmetric
995	<	TreeNode<V> sib = xpl;
996	<	if (sib != null && sib.red) {
997	<	sib.red = false;
998	<	xp.red = true;
999	<	rotateRight(xp);
1000	<	sib = (xp = x.parent) == null ? null : xp.left;
1020	<	}
1021	<	if (sib == null)
1022	<	x = xp;
1023	<	else {
1024	<	TreeNode<V> sl = sib.left, sr = sib.right;
1025	<	if ((sl == null || !sl.red) &&
1026	<	(sr == null || !sr.red)) {
1027	<	sib.red = true;
1028	<	x = xp;
1029	<	}
1030	<	else {
1031	<	if (sl == null || !sl.red) {
1032	<	if (sr != null)
1033	<	sr.red = false;
1034	<	sib.red = true;
1035	<	rotateLeft(sib);
1036	<	sib = (xp = x.parent) == null ?
1037	<	null : xp.left;
1038	<	}
1039	<	if (sib != null) {
1040	<	sib.red = (xp == null) ? false : xp.red;
1041	<	if ((sl = sib.left) != null)
1042	<	sl.red = false;
1043	<	}
1044	<	if (xp != null) {
1045	<	xp.red = false;
1046	<	rotateRight(xp);
1047	<	}
1048	<	x = root;
993	>	else if (f instanceof TreeBin) {
994	>	Node<K,V> p;
995	>	binCount = 2;
996	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
997	>	value)) != null) {
998	>	oldVal = p.val;
999	>	if (!onlyIfAbsent)
1000	>	p.val = value;
1001		}
1002		}
1003		}
1004		}
1005	<	}
1006	<	if (p == replacement && (pp = p.parent) != null) {
1007	<	if (p == pp.left) // detach pointers
1008	<	pp.left = null;
1009	<	else if (p == pp.right)
1010	<	pp.right = null;
1011	<	p.parent = null;
1005	>	if (binCount != 0) {
1006	>	if (binCount >= TREEIFY_THRESHOLD)
1007	>	treeifyBin(tab, i);
1008	>	if (oldVal != null)
1009	>	return oldVal;
1010	>	break;
1011	>	}
1012		}
1013		}
1014	+	addCount(1L, binCount);
1015	+	return null;
1016		}
1017
1064	–	/* ---------------- Collision reduction methods -------------- */
1065	–
1018		/**
1019	<	* Spreads higher bits to lower, and also forces top bit to 0.
1020	<	* Because the table uses power-of-two masking, sets of hashes
1021	<	* that vary only in bits above the current mask will always
1022	<	* collide. (Among known examples are sets of Float keys holding
1023	<	* consecutive whole numbers in small tables.)  To counter this,
1072	<	* we apply a transform that spreads the impact of higher bits
1073	<	* downward. There is a tradeoff between speed, utility, and
1074	<	* quality of bit-spreading. Because many common sets of hashes
1075	<	* are already reasonably distributed across bits (so don't benefit
1076	<	* from spreading), and because we use trees to handle large sets
1077	<	* of collisions in bins, we don't need excessively high quality.
1019	>	* Copies all of the mappings from the specified map to this one.
1020	>	* These mappings replace any mappings that this map had for any of the
1021	>	* keys currently in the specified map.
1022	>	*
1023	>	* @param m mappings to be stored in this map
1024		*/
1025	<	private static final int spread(int h) {
1026	<	h ^= (h >>> 18) ^ (h >>> 12);
1027	<	return (h ^ (h >>> 10)) & HASH_BITS;
1025	>	public void putAll(Map<? extends K, ? extends V> m) {
1026	>	tryPresize(m.size());
1027	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1028	>	putVal(e.getKey(), e.getValue(), false);
1029		}
1030
1031		/**
1032	<	* Replaces a list bin with a tree bin if key is comparable.  Call
1033	<	* only when locked.
1032	>	* Removes the key (and its corresponding value) from this map.
1033	>	* This method does nothing if the key is not in the map.
1034	>	*
1035	>	* @param  key the key that needs to be removed
1036	>	* @return the previous value associated with {@code key}, or
1037	>	*         {@code null} if there was no mapping for {@code key}
1038	>	* @throws NullPointerException if the specified key is null
1039		*/
1040	<	private final void replaceWithTreeBin(Node<V>[] tab, int index, Object key) {
1041	<	if (key instanceof Comparable) {
1090	<	TreeBin<V> t = new TreeBin<V>();
1091	<	for (Node<V> e = tabAt(tab, index); e != null; e = e.next)
1092	<	t.putTreeNode(e.hash, e.key, e.val);
1093	<	setTabAt(tab, index, new Node<V>(MOVED, t, null, null));
1094	<	}
1095	<	}
1096	<
1097	<	/* ---------------- Internal access and update methods -------------- */
1098	<
1099	<	/** Implementation for get and containsKey */
1100	<	@SuppressWarnings("unchecked") private final V internalGet(Object k) {
1101	<	int h = spread(k.hashCode());
1102	<	retry: for (Node<V>[] tab = table; tab != null;) {
1103	<	Node<V> e; Object ek; V ev; int eh; // locals to read fields once
1104	<	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1105	<	if ((eh = e.hash) < 0) {
1106	<	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1107	<	return ((TreeBin<V>)ek).getValue(h, k);
1108	<	else {                      // restart with new table
1109	<	tab = (Node<V>[])ek;
1110	<	continue retry;
1111	<	}
1112	<	}
1113	<	else if (eh == h && (ev = e.val) != null &&
1114	<	((ek = e.key) == k || k.equals(ek)))
1115	<	return ev;
1116	<	}
1117	<	break;
1118	<	}
1119	<	return null;
1040	>	public V remove(Object key) {
1041	>	return replaceNode(key, null, null);
1042		}
1043
1044		/**
#	Line 1124 | Line 1046 | public class ConcurrentHashMap<K, V>
1046		* Replaces node value with v, conditional upon match of cv if
1047		* non-null.  If resulting value is null, delete.
1048		*/
1049	<	@SuppressWarnings("unchecked") private final V internalReplace
1050	<	(Object k, V v, Object cv) {
1051	<	int h = spread(k.hashCode());
1052	<	V oldVal = null;
1053	<	for (Node<V>[] tab = table;;) {
1054	<	Node<V> f; int i, fh; Object fk;
1133	<	if (tab == null ||
1134	<	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1049	>	final V replaceNode(Object key, V value, Object cv) {
1050	>	int hash = spread(key.hashCode());
1051	>	for (Node<K,V>[] tab = table;;) {
1052	>	Node<K,V> f; int n, i, fh;
1053	>	if (tab == null || (n = tab.length) == 0 ||
1054	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1055		break;
1056	<	else if ((fh = f.hash) < 0) {
1057	<	if ((fk = f.key) instanceof TreeBin) {
1058	<	TreeBin<V> t = (TreeBin<V>)fk;
1059	<	boolean validated = false;
1060	<	boolean deleted = false;
1061	<	t.acquire(0);
1062	<	try {
1063	<	if (tabAt(tab, i) == f) {
1056	>	else if ((fh = f.hash) == MOVED)
1057	>	tab = helpTransfer(tab, f);
1058	>	else {
1059	>	V oldVal = null;
1060	>	boolean validated = false;
1061	>	synchronized (f) {
1062	>	if (tabAt(tab, i) == f) {
1063	>	if (fh >= 0) {
1064		validated = true;
1065	<	TreeNode<V> p = t.getTreeNode(h, k, t.root);
1066	<	if (p != null) {
1065	>	for (Node<K,V> e = f, pred = null;;) {
1066	>	K ek;
1067	>	if (e.hash == hash &&
1068	>	((ek = e.key) == key ||
1069	>	(ek != null && key.equals(ek)))) {
1070	>	V ev = e.val;
1071	>	if (cv == null || cv == ev ||
1072	>	(ev != null && cv.equals(ev))) {
1073	>	oldVal = ev;
1074	>	if (value != null)
1075	>	e.val = value;
1076	>	else if (pred != null)
1077	>	pred.next = e.next;
1078	>	else
1079	>	setTabAt(tab, i, e.next);
1080	>	}
1081	>	break;
1082	>	}
1083	>	pred = e;
1084	>	if ((e = e.next) == null)
1085	>	break;
1086	>	}
1087	>	}
1088	>	else if (f instanceof TreeBin) {
1089	>	validated = true;
1090	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1091	>	TreeNode<K,V> r, p;
1092	>	if ((r = t.root) != null &&
1093	>	(p = r.findTreeNode(hash, key, null)) != null) {
1094		V pv = p.val;
1095	<	if (cv == null || cv == pv || cv.equals(pv)) {
1095	>	if (cv == null || cv == pv ||
1096	>	(pv != null && cv.equals(pv))) {
1097		oldVal = pv;
1098	<	if ((p.val = v) == null) {
1099	<	deleted = true;
1100	<	t.deleteTreeNode(p);
1101	<	}
1098	>	if (value != null)
1099	>	p.val = value;
1100	>	else if (t.removeTreeNode(p))
1101	>	setTabAt(tab, i, untreeify(t.first));
1102		}
1103		}
1104		}
1157	–	} finally {
1158	–	t.release(0);
1105		}
1106	<	if (validated) {
1107	<	if (deleted)
1106	>	}
1107	>	if (validated) {
1108	>	if (oldVal != null) {
1109	>	if (value == null)
1110		addCount(-1L, -1);
1111	<	break;
1111	>	return oldVal;
1112		}
1113	+	break;
1114		}
1166	–	else
1167	–	tab = (Node<V>[])fk;
1115		}
1116	<	else if (fh != h && f.next == null) // precheck
1117	<	break;                          // rules out possible existence
1116	>	}
1117	>	return null;
1118	>	}
1119	>
1120	>	/**
1121	>	* Removes all of the mappings from this map.
1122	>	*/
1123	>	public void clear() {
1124	>	long delta = 0L; // negative number of deletions
1125	>	int i = 0;
1126	>	Node<K,V>[] tab = table;
1127	>	while (tab != null && i < tab.length) {
1128	>	int fh;
1129	>	Node<K,V> f = tabAt(tab, i);
1130	>	if (f == null)
1131	>	++i;
1132	>	else if ((fh = f.hash) == MOVED) {
1133	>	tab = helpTransfer(tab, f);
1134	>	i = 0; // restart
1135	>	}
1136		else {
1172	–	boolean validated = false;
1173	–	boolean deleted = false;
1137		synchronized (f) {
1138		if (tabAt(tab, i) == f) {
1139	<	validated = true;
1140	<	for (Node<V> e = f, pred = null;;) {
1141	<	Object ek; V ev;
1142	<	if (e.hash == h &&
1143	<	((ev = e.val) != null) &&
1144	<	((ek = e.key) == k || k.equals(ek))) {
1182	<	if (cv == null || cv == ev || cv.equals(ev)) {
1183	<	oldVal = ev;
1184	<	if ((e.val = v) == null) {
1185	<	deleted = true;
1186	<	Node<V> en = e.next;
1187	<	if (pred != null)
1188	<	pred.next = en;
1189	<	else
1190	<	setTabAt(tab, i, en);
1191	<	}
1192	<	}
1193	<	break;
1194	<	}
1195	<	pred = e;
1196	<	if ((e = e.next) == null)
1197	<	break;
1139	>	Node<K,V> p = (fh >= 0 ? f :
1140	>	(f instanceof TreeBin) ?
1141	>	((TreeBin<K,V>)f).first : null);
1142	>	while (p != null) {
1143	>	--delta;
1144	>	p = p.next;
1145		}
1146	+	setTabAt(tab, i++, null);
1147		}
1148		}
1149	<	if (validated) {
1150	<	if (deleted)
1151	<	addCount(-1L, -1);
1149	>	}
1150	>	}
1151	>	if (delta != 0L)
1152	>	addCount(delta, -1);
1153	>	}
1154	>
1155	>	/**
1156	>	* Returns a {@link Set} view of the keys contained in this map.
1157	>	* The set is backed by the map, so changes to the map are
1158	>	* reflected in the set, and vice-versa. The set supports element
1159	>	* removal, which removes the corresponding mapping from this map,
1160	>	* via the {@code Iterator.remove}, {@code Set.remove},
1161	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1162	>	* operations.  It does not support the {@code add} or
1163	>	* {@code addAll} operations.
1164	>	*
1165	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1166	>	* that will never throw {@link ConcurrentModificationException},
1167	>	* and guarantees to traverse elements as they existed upon
1168	>	* construction of the iterator, and may (but is not guaranteed to)
1169	>	* reflect any modifications subsequent to construction.
1170	>	*
1171	>	* @return the set view
1172	>	*/
1173	>	public KeySetView<K,V> keySet() {
1174	>	KeySetView<K,V> ks;
1175	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1176	>	}
1177	>
1178	>	/**
1179	>	* Returns a {@link Collection} view of the values contained in this map.
1180	>	* The collection is backed by the map, so changes to the map are
1181	>	* reflected in the collection, and vice-versa.  The collection
1182	>	* supports element removal, which removes the corresponding
1183	>	* mapping from this map, via the {@code Iterator.remove},
1184	>	* {@code Collection.remove}, {@code removeAll},
1185	>	* {@code retainAll}, and {@code clear} operations.  It does not
1186	>	* support the {@code add} or {@code addAll} operations.
1187	>	*
1188	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1189	>	* that will never throw {@link ConcurrentModificationException},
1190	>	* and guarantees to traverse elements as they existed upon
1191	>	* construction of the iterator, and may (but is not guaranteed to)
1192	>	* reflect any modifications subsequent to construction.
1193	>	*
1194	>	* @return the collection view
1195	>	*/
1196	>	public Collection<V> values() {
1197	>	ValuesView<K,V> vs;
1198	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1199	>	}
1200	>
1201	>	/**
1202	>	* Returns a {@link Set} view of the mappings contained in this map.
1203	>	* The set is backed by the map, so changes to the map are
1204	>	* reflected in the set, and vice-versa.  The set supports element
1205	>	* removal, which removes the corresponding mapping from the map,
1206	>	* via the {@code Iterator.remove}, {@code Set.remove},
1207	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1208	>	* operations.
1209	>	*
1210	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1211	>	* that will never throw {@link ConcurrentModificationException},
1212	>	* and guarantees to traverse elements as they existed upon
1213	>	* construction of the iterator, and may (but is not guaranteed to)
1214	>	* reflect any modifications subsequent to construction.
1215	>	*
1216	>	* @return the set view
1217	>	*/
1218	>	public Set<Map.Entry<K,V>> entrySet() {
1219	>	EntrySetView<K,V> es;
1220	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1221	>	}
1222	>
1223	>	/**
1224	>	* Returns the hash code value for this {@link Map}, i.e.,
1225	>	* the sum of, for each key-value pair in the map,
1226	>	* {@code key.hashCode() ^ value.hashCode()}.
1227	>	*
1228	>	* @return the hash code value for this map
1229	>	*/
1230	>	public int hashCode() {
1231	>	int h = 0;
1232	>	Node<K,V>[] t;
1233	>	if ((t = table) != null) {
1234	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1235	>	for (Node<K,V> p; (p = it.advance()) != null; )
1236	>	h += p.key.hashCode() ^ p.val.hashCode();
1237	>	}
1238	>	return h;
1239	>	}
1240	>
1241	>	/**
1242	>	* Returns a string representation of this map.  The string
1243	>	* representation consists of a list of key-value mappings (in no
1244	>	* particular order) enclosed in braces ("{@code {}}").  Adjacent
1245	>	* mappings are separated by the characters {@code ", "} (comma
1246	>	* and space).  Each key-value mapping is rendered as the key
1247	>	* followed by an equals sign ("{@code =}") followed by the
1248	>	* associated value.
1249	>	*
1250	>	* @return a string representation of this map
1251	>	*/
1252	>	public String toString() {
1253	>	Node<K,V>[] t;
1254	>	int f = (t = table) == null ? 0 : t.length;
1255	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1256	>	StringBuilder sb = new StringBuilder();
1257	>	sb.append('{');
1258	>	Node<K,V> p;
1259	>	if ((p = it.advance()) != null) {
1260	>	for (;;) {
1261	>	K k = p.key;
1262	>	V v = p.val;
1263	>	sb.append(k == this ? "(this Map)" : k);
1264	>	sb.append('=');
1265	>	sb.append(v == this ? "(this Map)" : v);
1266	>	if ((p = it.advance()) == null)
1267		break;
1268	<	}
1268	>	sb.append(',').append(' ');
1269		}
1270		}
1271	<	return oldVal;
1271	>	return sb.append('}').toString();
1272		}
1273
1274	<	/*
1275	<	* Internal versions of insertion methods
1276	<	* All have the same basic structure as the first (internalPut):
1277	<	*  1. If table uninitialized, create
1278	<	*  2. If bin empty, try to CAS new node
1279	<	*  3. If bin stale, use new table
1280	<	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1281	<	*  5. Lock and validate; if valid, scan and add or update
1282	<	*
1220	<	* The putAll method differs mainly in attempting to pre-allocate
1221	<	* enough table space, and also more lazily performs count updates
1222	<	* and checks.
1223	<	*
1224	<	* Most of the function-accepting methods can't be factored nicely
1225	<	* because they require different functional forms, so instead
1226	<	* sprawl out similar mechanics.
1274	>	/**
1275	>	* Compares the specified object with this map for equality.
1276	>	* Returns {@code true} if the given object is a map with the same
1277	>	* mappings as this map.  This operation may return misleading
1278	>	* results if either map is concurrently modified during execution
1279	>	* of this method.
1280	>	*
1281	>	* @param o object to be compared for equality with this map
1282	>	* @return {@code true} if the specified object is equal to this map
1283		*/
1284	+	public boolean equals(Object o) {
1285	+	if (o != this) {
1286	+	if (!(o instanceof Map))
1287	+	return false;
1288	+	Map<?,?> m = (Map<?,?>) o;
1289	+	Node<K,V>[] t;
1290	+	int f = (t = table) == null ? 0 : t.length;
1291	+	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1292	+	for (Node<K,V> p; (p = it.advance()) != null; ) {
1293	+	V val = p.val;
1294	+	Object v = m.get(p.key);
1295	+	if (v == null || (v != val && !v.equals(val)))
1296	+	return false;
1297	+	}
1298	+	for (Map.Entry<?,?> e : m.entrySet()) {
1299	+	Object mk, mv, v;
1300	+	if ((mk = e.getKey()) == null ||
1301	+	(mv = e.getValue()) == null ||
1302	+	(v = get(mk)) == null ||
1303	+	(mv != v && !mv.equals(v)))
1304	+	return false;
1305	+	}
1306	+	}
1307	+	return true;
1308	+	}
1309
1310	<	/** Implementation for put and putIfAbsent */
1311	<	@SuppressWarnings("unchecked") private final V internalPut
1312	<	(K k, V v, boolean onlyIfAbsent) {
1313	<	if (k == null || v == null) throw new NullPointerException();
1314	<	int h = spread(k.hashCode());
1315	<	int len = 0;
1316	<	for (Node<V>[] tab = table;;) {
1317	<	int i, fh; Node<V> f; Object fk; V fv;
1318	<	if (tab == null)
1319	<	tab = initTable();
1320	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1321	<	if (casTabAt(tab, i, null, new Node<V>(h, k, v, null)))
1322	<	break;                   // no lock when adding to empty bin
1310	>	/**
1311	>	* Stripped-down version of helper class used in previous version,
1312	>	* declared for the sake of serialization compatibility
1313	>	*/
1314	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1315	>	private static final long serialVersionUID = 2249069246763182397L;
1316	>	final float loadFactor;
1317	>	Segment(float lf) { this.loadFactor = lf; }
1318	>	}
1319	>
1320	>	/**
1321	>	* Saves the state of the {@code ConcurrentHashMap} instance to a
1322	>	* stream (i.e., serializes it).
1323	>	* @param s the stream
1324	>	* @serialData
1325	>	* the key (Object) and value (Object)
1326	>	* for each key-value mapping, followed by a null pair.
1327	>	* The key-value mappings are emitted in no particular order.
1328	>	*/
1329	>	private void writeObject(java.io.ObjectOutputStream s)
1330	>	throws java.io.IOException {
1331	>	// For serialization compatibility
1332	>	// Emulate segment calculation from previous version of this class
1333	>	int sshift = 0;
1334	>	int ssize = 1;
1335	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1336	>	++sshift;
1337	>	ssize <<= 1;
1338	>	}
1339	>	int segmentShift = 32 - sshift;
1340	>	int segmentMask = ssize - 1;
1341	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1342	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1343	>	for (int i = 0; i < segments.length; ++i)
1344	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1345	>	s.putFields().put("segments", segments);
1346	>	s.putFields().put("segmentShift", segmentShift);
1347	>	s.putFields().put("segmentMask", segmentMask);
1348	>	s.writeFields();
1349	>
1350	>	Node<K,V>[] t;
1351	>	if ((t = table) != null) {
1352	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1353	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1354	>	s.writeObject(p.key);
1355	>	s.writeObject(p.val);
1356		}
1357	<	else if ((fh = f.hash) < 0) {
1358	<	if ((fk = f.key) instanceof TreeBin) {
1359	<	TreeBin<V> t = (TreeBin<V>)fk;
1360	<	V oldVal = null;
1361	<	t.acquire(0);
1362	<	try {
1363	<	if (tabAt(tab, i) == f) {
1364	<	len = 2;
1365	<	TreeNode<V> p = t.putTreeNode(h, k, v);
1366	<	if (p != null) {
1367	<	oldVal = p.val;
1368	<	if (!onlyIfAbsent)
1369	<	p.val = v;
1370	<	}
1371	<	}
1372	<	} finally {
1373	<	t.release(0);
1374	<	}
1375	<	if (len != 0) {
1376	<	if (oldVal != null)
1377	<	return oldVal;
1378	<	break;
1379	<	}
1380	<	}
1381	<	else
1382	<	tab = (Node<V>[])fk;
1357	>	}
1358	>	s.writeObject(null);
1359	>	s.writeObject(null);
1360	>	segments = null; // throw away
1361	>	}
1362	>
1363	>	/**
1364	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1365	>	* @param s the stream
1366	>	*/
1367	>	private void readObject(java.io.ObjectInputStream s)
1368	>	throws java.io.IOException, ClassNotFoundException {
1369	>	/*
1370	>	* To improve performance in typical cases, we create nodes
1371	>	* while reading, then place in table once size is known.
1372	>	* However, we must also validate uniqueness and deal with
1373	>	* overpopulated bins while doing so, which requires
1374	>	* specialized versions of putVal mechanics.
1375	>	*/
1376	>	sizeCtl = -1; // force exclusion for table construction
1377	>	s.defaultReadObject();
1378	>	long size = 0L;
1379	>	Node<K,V> p = null;
1380	>	for (;;) {
1381	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1382	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1383	>	if (k != null && v != null) {
1384	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1385	>	++size;
1386		}
1387	<	else if (onlyIfAbsent && fh == h && (fv = f.val) != null &&
1388	<	((fk = f.key) == k || k.equals(fk))) // peek while nearby
1389	<	return fv;
1387	>	else
1388	>	break;
1389	>	}
1390	>	if (size == 0L)
1391	>	sizeCtl = 0;
1392	>	else {
1393	>	int n;
1394	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1395	>	n = MAXIMUM_CAPACITY;
1396		else {
1397	<	V oldVal = null;
1398	<	synchronized (f) {
1399	<	if (tabAt(tab, i) == f) {
1400	<	len = 1;
1401	<	for (Node<V> e = f;; ++len) {
1402	<	Object ek; V ev;
1403	<	if (e.hash == h &&
1404	<	(ev = e.val) != null &&
1405	<	((ek = e.key) == k || k.equals(ek))) {
1406	<	oldVal = ev;
1407	<	if (!onlyIfAbsent)
1408	<	e.val = v;
1397	>	int sz = (int)size;
1398	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1399	>	}
1400	>	@SuppressWarnings({"rawtypes","unchecked"})
1401	>	Node<K,V>[] tab = (Node<K,V>[])new Node[n];
1402	>	int mask = n - 1;
1403	>	long added = 0L;
1404	>	while (p != null) {
1405	>	boolean insertAtFront;
1406	>	Node<K,V> next = p.next, first;
1407	>	int h = p.hash, j = h & mask;
1408	>	if ((first = tabAt(tab, j)) == null)
1409	>	insertAtFront = true;
1410	>	else {
1411	>	K k = p.key;
1412	>	if (first.hash < 0) {
1413	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1414	>	if (t.putTreeVal(h, k, p.val) == null)
1415	>	++added;
1416	>	insertAtFront = false;
1417	>	}
1418	>	else {
1419	>	int binCount = 0;
1420	>	insertAtFront = true;
1421	>	Node<K,V> q; K qk;
1422	>	for (q = first; q != null; q = q.next) {
1423	>	if (q.hash == h &&
1424	>	((qk = q.key) == k ||
1425	>	(qk != null && k.equals(qk)))) {
1426	>	insertAtFront = false;
1427		break;
1428		}
1429	<	Node<V> last = e;
1430	<	if ((e = e.next) == null) {
1431	<	last.next = new Node<V>(h, k, v, null);
1432	<	if (len >= TREE_THRESHOLD)
1433	<	replaceWithTreeBin(tab, i, k);
1434	<	break;
1429	>	++binCount;
1430	>	}
1431	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1432	>	insertAtFront = false;
1433	>	++added;
1434	>	p.next = first;
1435	>	TreeNode<K,V> hd = null, tl = null;
1436	>	for (q = p; q != null; q = q.next) {
1437	>	TreeNode<K,V> t = new TreeNode<K,V>
1438	>	(q.hash, q.key, q.val, null, null);
1439	>	if ((t.prev = tl) == null)
1440	>	hd = t;
1441	>	else
1442	>	tl.next = t;
1443	>	tl = t;
1444		}
1445	+	setTabAt(tab, j, new TreeBin<K,V>(hd));
1446		}
1447		}
1448		}
1449	<	if (len != 0) {
1450	<	if (oldVal != null)
1451	<	return oldVal;
1452	<	break;
1449	>	if (insertAtFront) {
1450	>	++added;
1451	>	p.next = first;
1452	>	setTabAt(tab, j, p);
1453		}
1454	+	p = next;
1455		}
1456	+	table = tab;
1457	+	sizeCtl = n - (n >>> 2);
1458	+	baseCount = added;
1459		}
1305	–	addCount(1L, len);
1306	–	return null;
1460		}
1461
1462	<	/** Implementation for computeIfAbsent */
1463	<	@SuppressWarnings("unchecked") private final V internalComputeIfAbsent
1464	<	(K k, Function<? super K, ? extends V> mf) {
1465	<	if (k == null || mf == null)
1462	>	// ConcurrentMap methods
1463	>
1464	>	/**
1465	>	* {@inheritDoc}
1466	>	*
1467	>	* @return the previous value associated with the specified key,
1468	>	*         or {@code null} if there was no mapping for the key
1469	>	* @throws NullPointerException if the specified key or value is null
1470	>	*/
1471	>	public V putIfAbsent(K key, V value) {
1472	>	return putVal(key, value, true);
1473	>	}
1474	>
1475	>	/**
1476	>	* {@inheritDoc}
1477	>	*
1478	>	* @throws NullPointerException if the specified key is null
1479	>	*/
1480	>	public boolean remove(Object key, Object value) {
1481	>	if (key == null)
1482		throw new NullPointerException();
1483	<	int h = spread(k.hashCode());
1483	>	return value != null && replaceNode(key, null, value) != null;
1484	>	}
1485	>
1486	>	/**
1487	>	* {@inheritDoc}
1488	>	*
1489	>	* @throws NullPointerException if any of the arguments are null
1490	>	*/
1491	>	public boolean replace(K key, V oldValue, V newValue) {
1492	>	if (key == null || oldValue == null || newValue == null)
1493	>	throw new NullPointerException();
1494	>	return replaceNode(key, newValue, oldValue) != null;
1495	>	}
1496	>
1497	>	/**
1498	>	* {@inheritDoc}
1499	>	*
1500	>	* @return the previous value associated with the specified key,
1501	>	*         or {@code null} if there was no mapping for the key
1502	>	* @throws NullPointerException if the specified key or value is null
1503	>	*/
1504	>	public V replace(K key, V value) {
1505	>	if (key == null || value == null)
1506	>	throw new NullPointerException();
1507	>	return replaceNode(key, value, null);
1508	>	}
1509	>
1510	>	// Overrides of JDK8+ Map extension method defaults
1511	>
1512	>	/**
1513	>	* Returns the value to which the specified key is mapped, or the
1514	>	* given default value if this map contains no mapping for the
1515	>	* key.
1516	>	*
1517	>	* @param key the key whose associated value is to be returned
1518	>	* @param defaultValue the value to return if this map contains
1519	>	* no mapping for the given key
1520	>	* @return the mapping for the key, if present; else the default value
1521	>	* @throws NullPointerException if the specified key is null
1522	>	*/
1523	>	public V getOrDefault(Object key, V defaultValue) {
1524	>	V v;
1525	>	return (v = get(key)) == null ? defaultValue : v;
1526	>	}
1527	>
1528	>	public void forEach(BiConsumer<? super K, ? super V> action) {
1529	>	if (action == null) throw new NullPointerException();
1530	>	Node<K,V>[] t;
1531	>	if ((t = table) != null) {
1532	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1533	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1534	>	action.accept(p.key, p.val);
1535	>	}
1536	>	}
1537	>	}
1538	>
1539	>	public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {
1540	>	if (function == null) throw new NullPointerException();
1541	>	Node<K,V>[] t;
1542	>	if ((t = table) != null) {
1543	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1544	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1545	>	V oldValue = p.val;
1546	>	for (K key = p.key;;) {
1547	>	V newValue = function.apply(key, oldValue);
1548	>	if (newValue == null)
1549	>	throw new NullPointerException();
1550	>	if (replaceNode(key, newValue, oldValue) != null ||
1551	>	(oldValue = get(key)) == null)
1552	>	break;
1553	>	}
1554	>	}
1555	>	}
1556	>	}
1557	>
1558	>	/**
1559	>	* If the specified key is not already associated with a value,
1560	>	* attempts to compute its value using the given mapping function
1561	>	* and enters it into this map unless {@code null}.  The entire
1562	>	* method invocation is performed atomically, so the function is
1563	>	* applied at most once per key.  Some attempted update operations
1564	>	* on this map by other threads may be blocked while computation
1565	>	* is in progress, so the computation should be short and simple,
1566	>	* and must not attempt to update any other mappings of this map.
1567	>	*
1568	>	* @param key key with which the specified value is to be associated
1569	>	* @param mappingFunction the function to compute a value
1570	>	* @return the current (existing or computed) value associated with
1571	>	*         the specified key, or null if the computed value is null
1572	>	* @throws NullPointerException if the specified key or mappingFunction
1573	>	*         is null
1574	>	* @throws IllegalStateException if the computation detectably
1575	>	*         attempts a recursive update to this map that would
1576	>	*         otherwise never complete
1577	>	* @throws RuntimeException or Error if the mappingFunction does so,
1578	>	*         in which case the mapping is left unestablished
1579	>	*/
1580	>	public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
1581	>	if (key == null || mappingFunction == null)
1582	>	throw new NullPointerException();
1583	>	int h = spread(key.hashCode());
1584		V val = null;
1585	<	int len = 0;
1586	<	for (Node<V>[] tab = table;;) {
1587	<	Node<V> f; int i; Object fk;
1588	<	if (tab == null)
1585	>	int binCount = 0;
1586	>	for (Node<K,V>[] tab = table;;) {
1587	>	Node<K,V> f; int n, i, fh;
1588	>	if (tab == null || (n = tab.length) == 0)
1589		tab = initTable();
1590	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1591	<	Node<V> node = new Node<V>(h, k, null, null);
1592	<	synchronized (node) {
1593	<	if (casTabAt(tab, i, null, node)) {
1594	<	len = 1;
1590	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1591	>	Node<K,V> r = new ReservationNode<K,V>();
1592	>	synchronized (r) {
1593	>	if (casTabAt(tab, i, null, r)) {
1594	>	binCount = 1;
1595	>	Node<K,V> node = null;
1596		try {
1597	<	if ((val = mf.apply(k)) != null)
1598	<	node.val = val;
1597	>	if ((val = mappingFunction.apply(key)) != null)
1598	>	node = new Node<K,V>(h, key, val, null);
1599		} finally {
1600	<	if (val == null)
1331	<	setTabAt(tab, i, null);
1600	>	setTabAt(tab, i, node);
1601		}
1602		}
1603		}
1604	<	if (len != 0)
1604	>	if (binCount != 0)
1605		break;
1606		}
1607	<	else if (f.hash < 0) {
1608	<	if ((fk = f.key) instanceof TreeBin) {
1609	<	TreeBin<V> t = (TreeBin<V>)fk;
1610	<	boolean added = false;
1611	<	t.acquire(0);
1612	<	try {
1613	<	if (tabAt(tab, i) == f) {
1614	<	len = 1;
1615	<	TreeNode<V> p = t.getTreeNode(h, k, t.root);
1616	<	if (p != null)
1607	>	else if ((fh = f.hash) == MOVED)
1608	>	tab = helpTransfer(tab, f);
1609	>	else {
1610	>	boolean added = false;
1611	>	synchronized (f) {
1612	>	if (tabAt(tab, i) == f) {
1613	>	if (fh >= 0) {
1614	>	binCount = 1;
1615	>	for (Node<K,V> e = f;; ++binCount) {
1616	>	K ek; V ev;
1617	>	if (e.hash == h &&
1618	>	((ek = e.key) == key ||
1619	>	(ek != null && key.equals(ek)))) {
1620	>	val = e.val;
1621	>	break;
1622	>	}
1623	>	Node<K,V> pred = e;
1624	>	if ((e = e.next) == null) {
1625	>	if ((val = mappingFunction.apply(key)) != null) {
1626	>	added = true;
1627	>	pred.next = new Node<K,V>(h, key, val, null);
1628	>	}
1629	>	break;
1630	>	}
1631	>	}
1632	>	}
1633	>	else if (f instanceof TreeBin) {
1634	>	binCount = 2;
1635	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1636	>	TreeNode<K,V> r, p;
1637	>	if ((r = t.root) != null &&
1638	>	(p = r.findTreeNode(h, key, null)) != null)
1639		val = p.val;
1640	<	else if ((val = mf.apply(k)) != null) {
1640	>	else if ((val = mappingFunction.apply(key)) != null) {
1641		added = true;
1642	<	len = 2;
1352	<	t.putTreeNode(h, k, val);
1642	>	t.putTreeVal(h, key, val);
1643		}
1644		}
1355	–	} finally {
1356	–	t.release(0);
1357	–	}
1358	–	if (len != 0) {
1359	–	if (!added)
1360	–	return val;
1361	–	break;
1645		}
1646		}
1647	<	else
1648	<	tab = (Node<V>[])fk;
1647	>	if (binCount != 0) {
1648	>	if (binCount >= TREEIFY_THRESHOLD)
1649	>	treeifyBin(tab, i);
1650	>	if (!added)
1651	>	return val;
1652	>	break;
1653	>	}
1654		}
1655	+	}
1656	+	if (val != null)
1657	+	addCount(1L, binCount);
1658	+	return val;
1659	+	}
1660	+
1661	+	/**
1662	+	* If the value for the specified key is present, attempts to
1663	+	* compute a new mapping given the key and its current mapped
1664	+	* value.  The entire method invocation is performed atomically.
1665	+	* Some attempted update operations on this map by other threads
1666	+	* may be blocked while computation is in progress, so the
1667	+	* computation should be short and simple, and must not attempt to
1668	+	* update any other mappings of this map.
1669	+	*
1670	+	* @param key key with which a value may be associated
1671	+	* @param remappingFunction the function to compute a value
1672	+	* @return the new value associated with the specified key, or null if none
1673	+	* @throws NullPointerException if the specified key or remappingFunction
1674	+	*         is null
1675	+	* @throws IllegalStateException if the computation detectably
1676	+	*         attempts a recursive update to this map that would
1677	+	*         otherwise never complete
1678	+	* @throws RuntimeException or Error if the remappingFunction does so,
1679	+	*         in which case the mapping is unchanged
1680	+	*/
1681	+	public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
1682	+	if (key == null || remappingFunction == null)
1683	+	throw new NullPointerException();
1684	+	int h = spread(key.hashCode());
1685	+	V val = null;
1686	+	int delta = 0;
1687	+	int binCount = 0;
1688	+	for (Node<K,V>[] tab = table;;) {
1689	+	Node<K,V> f; int n, i, fh;
1690	+	if (tab == null || (n = tab.length) == 0)
1691	+	tab = initTable();
1692	+	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1693	+	break;
1694	+	else if ((fh = f.hash) == MOVED)
1695	+	tab = helpTransfer(tab, f);
1696		else {
1368	–	for (Node<V> e = f; e != null; e = e.next) { // prescan
1369	–	Object ek; V ev;
1370	–	if (e.hash == h && (ev = e.val) != null &&
1371	–	((ek = e.key) == k || k.equals(ek)))
1372	–	return ev;
1373	–	}
1374	–	boolean added = false;
1697		synchronized (f) {
1698		if (tabAt(tab, i) == f) {
1699	<	len = 1;
1700	<	for (Node<V> e = f;; ++len) {
1701	<	Object ek; V ev;
1702	<	if (e.hash == h &&
1703	<	(ev = e.val) != null &&
1704	<	((ek = e.key) == k || k.equals(ek))) {
1705	<	val = ev;
1706	<	break;
1699	>	if (fh >= 0) {
1700	>	binCount = 1;
1701	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1702	>	K ek;
1703	>	if (e.hash == h &&
1704	>	((ek = e.key) == key ||
1705	>	(ek != null && key.equals(ek)))) {
1706	>	val = remappingFunction.apply(key, e.val);
1707	>	if (val != null)
1708	>	e.val = val;
1709	>	else {
1710	>	delta = -1;
1711	>	Node<K,V> en = e.next;
1712	>	if (pred != null)
1713	>	pred.next = en;
1714	>	else
1715	>	setTabAt(tab, i, en);
1716	>	}
1717	>	break;
1718	>	}
1719	>	pred = e;
1720	>	if ((e = e.next) == null)
1721	>	break;
1722		}
1723	<	Node<V> last = e;
1724	<	if ((e = e.next) == null) {
1725	<	if ((val = mf.apply(k)) != null) {
1726	<	added = true;
1727	<	last.next = new Node<V>(h, k, val, null);
1728	<	if (len >= TREE_THRESHOLD)
1729	<	replaceWithTreeBin(tab, i, k);
1723	>	}
1724	>	else if (f instanceof TreeBin) {
1725	>	binCount = 2;
1726	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1727	>	TreeNode<K,V> r, p;
1728	>	if ((r = t.root) != null &&
1729	>	(p = r.findTreeNode(h, key, null)) != null) {
1730	>	val = remappingFunction.apply(key, p.val);
1731	>	if (val != null)
1732	>	p.val = val;
1733	>	else {
1734	>	delta = -1;
1735	>	if (t.removeTreeNode(p))
1736	>	setTabAt(tab, i, untreeify(t.first));
1737		}
1394	–	break;
1738		}
1739		}
1740		}
1741		}
1742	<	if (len != 0) {
1400	<	if (!added)
1401	<	return val;
1742	>	if (binCount != 0)
1743		break;
1403	–	}
1744		}
1745		}
1746	<	if (val != null)
1747	<	addCount(1L, len);
1746	>	if (delta != 0)
1747	>	addCount((long)delta, binCount);
1748		return val;
1749		}
1750
1751	<	/** Implementation for compute */
1752	<	@SuppressWarnings("unchecked") private final V internalCompute
1753	<	(K k, boolean onlyIfPresent,
1754	<	BiFunction<? super K, ? super V, ? extends V> mf) {
1755	<	if (k == null || mf == null)
1751	>	/**
1752	>	* Attempts to compute a mapping for the specified key and its
1753	>	* current mapped value (or {@code null} if there is no current
1754	>	* mapping). The entire method invocation is performed atomically.
1755	>	* Some attempted update operations on this map by other threads
1756	>	* may be blocked while computation is in progress, so the
1757	>	* computation should be short and simple, and must not attempt to
1758	>	* update any other mappings of this Map.
1759	>	*
1760	>	* @param key key with which the specified value is to be associated
1761	>	* @param remappingFunction the function to compute a value
1762	>	* @return the new value associated with the specified key, or null if none
1763	>	* @throws NullPointerException if the specified key or remappingFunction
1764	>	*         is null
1765	>	* @throws IllegalStateException if the computation detectably
1766	>	*         attempts a recursive update to this map that would
1767	>	*         otherwise never complete
1768	>	* @throws RuntimeException or Error if the remappingFunction does so,
1769	>	*         in which case the mapping is unchanged
1770	>	*/
1771	>	public V compute(K key,
1772	>	BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
1773	>	if (key == null || remappingFunction == null)
1774		throw new NullPointerException();
1775	<	int h = spread(k.hashCode());
1775	>	int h = spread(key.hashCode());
1776		V val = null;
1777		int delta = 0;
1778	<	int len = 0;
1779	<	for (Node<V>[] tab = table;;) {
1780	<	Node<V> f; int i, fh; Object fk;
1781	<	if (tab == null)
1778	>	int binCount = 0;
1779	>	for (Node<K,V>[] tab = table;;) {
1780	>	Node<K,V> f; int n, i, fh;
1781	>	if (tab == null || (n = tab.length) == 0)
1782		tab = initTable();
1783	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1784	<	if (onlyIfPresent)
1785	<	break;
1786	<	Node<V> node = new Node<V>(h, k, null, null);
1787	<	synchronized (node) {
1788	<	if (casTabAt(tab, i, null, node)) {
1783	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1784	>	Node<K,V> r = new ReservationNode<K,V>();
1785	>	synchronized (r) {
1786	>	if (casTabAt(tab, i, null, r)) {
1787	>	binCount = 1;
1788	>	Node<K,V> node = null;
1789		try {
1790	<	len = 1;
1433	<	if ((val = mf.apply(k, null)) != null) {
1434	<	node.val = val;
1790	>	if ((val = remappingFunction.apply(key, null)) != null) {
1791		delta = 1;
1792	+	node = new Node<K,V>(h, key, val, null);
1793		}
1794		} finally {
1795	<	if (delta == 0)
1439	<	setTabAt(tab, i, null);
1795	>	setTabAt(tab, i, node);
1796		}
1797		}
1798		}
1799	<	if (len != 0)
1799	>	if (binCount != 0)
1800		break;
1801		}
1802	<	else if ((fh = f.hash) < 0) {
1803	<	if ((fk = f.key) instanceof TreeBin) {
1804	<	TreeBin<V> t = (TreeBin<V>)fk;
1805	<	t.acquire(0);
1806	<	try {
1807	<	if (tabAt(tab, i) == f) {
1808	<	len = 1;
1809	<	TreeNode<V> p = t.getTreeNode(h, k, t.root);
1810	<	if (p == null && onlyIfPresent)
1811	<	break;
1802	>	else if ((fh = f.hash) == MOVED)
1803	>	tab = helpTransfer(tab, f);
1804	>	else {
1805	>	synchronized (f) {
1806	>	if (tabAt(tab, i) == f) {
1807	>	if (fh >= 0) {
1808	>	binCount = 1;
1809	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1810	>	K ek;
1811	>	if (e.hash == h &&
1812	>	((ek = e.key) == key ||
1813	>	(ek != null && key.equals(ek)))) {
1814	>	val = remappingFunction.apply(key, e.val);
1815	>	if (val != null)
1816	>	e.val = val;
1817	>	else {
1818	>	delta = -1;
1819	>	Node<K,V> en = e.next;
1820	>	if (pred != null)
1821	>	pred.next = en;
1822	>	else
1823	>	setTabAt(tab, i, en);
1824	>	}
1825	>	break;
1826	>	}
1827	>	pred = e;
1828	>	if ((e = e.next) == null) {
1829	>	val = remappingFunction.apply(key, null);
1830	>	if (val != null) {
1831	>	delta = 1;
1832	>	pred.next =
1833	>	new Node<K,V>(h, key, val, null);
1834	>	}
1835	>	break;
1836	>	}
1837	>	}
1838	>	}
1839	>	else if (f instanceof TreeBin) {
1840	>	binCount = 1;
1841	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1842	>	TreeNode<K,V> r, p;
1843	>	if ((r = t.root) != null)
1844	>	p = r.findTreeNode(h, key, null);
1845	>	else
1846	>	p = null;
1847		V pv = (p == null) ? null : p.val;
1848	<	if ((val = mf.apply(k, pv)) != null) {
1848	>	val = remappingFunction.apply(key, pv);
1849	>	if (val != null) {
1850		if (p != null)
1851		p.val = val;
1852		else {
1461	–	len = 2;
1853		delta = 1;
1854	<	t.putTreeNode(h, k, val);
1854	>	t.putTreeVal(h, key, val);
1855		}
1856		}
1857		else if (p != null) {
1858		delta = -1;
1859	<	t.deleteTreeNode(p);
1860	<	}
1470	<	}
1471	<	} finally {
1472	<	t.release(0);
1473	<	}
1474	<	if (len != 0)
1475	<	break;
1476	<	}
1477	<	else
1478	<	tab = (Node<V>[])fk;
1479	<	}
1480	<	else {
1481	<	synchronized (f) {
1482	<	if (tabAt(tab, i) == f) {
1483	<	len = 1;
1484	<	for (Node<V> e = f, pred = null;; ++len) {
1485	<	Object ek; V ev;
1486	<	if (e.hash == h &&
1487	<	(ev = e.val) != null &&
1488	<	((ek = e.key) == k || k.equals(ek))) {
1489	<	val = mf.apply(k, ev);
1490	<	if (val != null)
1491	<	e.val = val;
1492	<	else {
1493	<	delta = -1;
1494	<	Node<V> en = e.next;
1495	<	if (pred != null)
1496	<	pred.next = en;
1497	<	else
1498	<	setTabAt(tab, i, en);
1499	<	}
1500	<	break;
1501	<	}
1502	<	pred = e;
1503	<	if ((e = e.next) == null) {
1504	<	if (!onlyIfPresent &&
1505	<	(val = mf.apply(k, null)) != null) {
1506	<	pred.next = new Node<V>(h, k, val, null);
1507	<	delta = 1;
1508	<	if (len >= TREE_THRESHOLD)
1509	<	replaceWithTreeBin(tab, i, k);
1510	<	}
1511	<	break;
1859	>	if (t.removeTreeNode(p))
1860	>	setTabAt(tab, i, untreeify(t.first));
1861		}
1862		}
1863		}
1864		}
1865	<	if (len != 0)
1865	>	if (binCount != 0) {
1866	>	if (binCount >= TREEIFY_THRESHOLD)
1867	>	treeifyBin(tab, i);
1868		break;
1869	+	}
1870		}
1871		}
1872		if (delta != 0)
1873	<	addCount((long)delta, len);
1873	>	addCount((long)delta, binCount);
1874		return val;
1875		}
1876
1877	<	/** Implementation for merge */
1878	<	@SuppressWarnings("unchecked") private final V internalMerge
1879	<	(K k, V v, BiFunction<? super V, ? super V, ? extends V> mf) {
1880	<	if (k == null || v == null || mf == null)
1877	>	/**
1878	>	* If the specified key is not already associated with a
1879	>	* (non-null) value, associates it with the given value.
1880	>	* Otherwise, replaces the value with the results of the given
1881	>	* remapping function, or removes if {@code null}. The entire
1882	>	* method invocation is performed atomically.  Some attempted
1883	>	* update operations on this map by other threads may be blocked
1884	>	* while computation is in progress, so the computation should be
1885	>	* short and simple, and must not attempt to update any other
1886	>	* mappings of this Map.
1887	>	*
1888	>	* @param key key with which the specified value is to be associated
1889	>	* @param value the value to use if absent
1890	>	* @param remappingFunction the function to recompute a value if present
1891	>	* @return the new value associated with the specified key, or null if none
1892	>	* @throws NullPointerException if the specified key or the
1893	>	*         remappingFunction is null
1894	>	* @throws RuntimeException or Error if the remappingFunction does so,
1895	>	*         in which case the mapping is unchanged
1896	>	*/
1897	>	public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
1898	>	if (key == null || value == null || remappingFunction == null)
1899		throw new NullPointerException();
1900	<	int h = spread(k.hashCode());
1900	>	int h = spread(key.hashCode());
1901		V val = null;
1902		int delta = 0;
1903	<	int len = 0;
1904	<	for (Node<V>[] tab = table;;) {
1905	<	int i; Node<V> f; Object fk; V fv;
1906	<	if (tab == null)
1903	>	int binCount = 0;
1904	>	for (Node<K,V>[] tab = table;;) {
1905	>	Node<K,V> f; int n, i, fh;
1906	>	if (tab == null || (n = tab.length) == 0)
1907		tab = initTable();
1908	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1909	<	if (casTabAt(tab, i, null, new Node<V>(h, k, v, null))) {
1908	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1909	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1910		delta = 1;
1911	<	val = v;
1911	>	val = value;
1912		break;
1913		}
1914		}
1915	<	else if (f.hash < 0) {
1916	<	if ((fk = f.key) instanceof TreeBin) {
1917	<	TreeBin<V> t = (TreeBin<V>)fk;
1918	<	t.acquire(0);
1919	<	try {
1920	<	if (tabAt(tab, i) == f) {
1921	<	len = 1;
1922	<	TreeNode<V> p = t.getTreeNode(h, k, t.root);
1923	<	val = (p == null) ? v : mf.apply(p.val, v);
1915	>	else if ((fh = f.hash) == MOVED)
1916	>	tab = helpTransfer(tab, f);
1917	>	else {
1918	>	synchronized (f) {
1919	>	if (tabAt(tab, i) == f) {
1920	>	if (fh >= 0) {
1921	>	binCount = 1;
1922	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1923	>	K ek;
1924	>	if (e.hash == h &&
1925	>	((ek = e.key) == key ||
1926	>	(ek != null && key.equals(ek)))) {
1927	>	val = remappingFunction.apply(e.val, value);
1928	>	if (val != null)
1929	>	e.val = val;
1930	>	else {
1931	>	delta = -1;
1932	>	Node<K,V> en = e.next;
1933	>	if (pred != null)
1934	>	pred.next = en;
1935	>	else
1936	>	setTabAt(tab, i, en);
1937	>	}
1938	>	break;
1939	>	}
1940	>	pred = e;
1941	>	if ((e = e.next) == null) {
1942	>	delta = 1;
1943	>	val = value;
1944	>	pred.next =
1945	>	new Node<K,V>(h, key, val, null);
1946	>	break;
1947	>	}
1948	>	}
1949	>	}
1950	>	else if (f instanceof TreeBin) {
1951	>	binCount = 2;
1952	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1953	>	TreeNode<K,V> r = t.root;
1954	>	TreeNode<K,V> p = (r == null) ? null :
1955	>	r.findTreeNode(h, key, null);
1956	>	val = (p == null) ? value :
1957	>	remappingFunction.apply(p.val, value);
1958		if (val != null) {
1959		if (p != null)
1960		p.val = val;
1961		else {
1558	–	len = 2;
1962		delta = 1;
1963	<	t.putTreeNode(h, k, val);
1963	>	t.putTreeVal(h, key, val);
1964		}
1965		}
1966		else if (p != null) {
1967		delta = -1;
1968	<	t.deleteTreeNode(p);
1969	<	}
1567	<	}
1568	<	} finally {
1569	<	t.release(0);
1570	<	}
1571	<	if (len != 0)
1572	<	break;
1573	<	}
1574	<	else
1575	<	tab = (Node<V>[])fk;
1576	<	}
1577	<	else {
1578	<	synchronized (f) {
1579	<	if (tabAt(tab, i) == f) {
1580	<	len = 1;
1581	<	for (Node<V> e = f, pred = null;; ++len) {
1582	<	Object ek; V ev;
1583	<	if (e.hash == h &&
1584	<	(ev = e.val) != null &&
1585	<	((ek = e.key) == k || k.equals(ek))) {
1586	<	val = mf.apply(ev, v);
1587	<	if (val != null)
1588	<	e.val = val;
1589	<	else {
1590	<	delta = -1;
1591	<	Node<V> en = e.next;
1592	<	if (pred != null)
1593	<	pred.next = en;
1594	<	else
1595	<	setTabAt(tab, i, en);
1596	<	}
1597	<	break;
1598	<	}
1599	<	pred = e;
1600	<	if ((e = e.next) == null) {
1601	<	val = v;
1602	<	pred.next = new Node<V>(h, k, val, null);
1603	<	delta = 1;
1604	<	if (len >= TREE_THRESHOLD)
1605	<	replaceWithTreeBin(tab, i, k);
1606	<	break;
1968	>	if (t.removeTreeNode(p))
1969	>	setTabAt(tab, i, untreeify(t.first));
1970		}
1971		}
1972		}
1973		}
1974	<	if (len != 0)
1974	>	if (binCount != 0) {
1975	>	if (binCount >= TREEIFY_THRESHOLD)
1976	>	treeifyBin(tab, i);
1977		break;
1978	+	}
1979		}
1980		}
1981		if (delta != 0)
1982	<	addCount((long)delta, len);
1982	>	addCount((long)delta, binCount);
1983		return val;
1984		}
1985
1986	<	/** Implementation for putAll */
1987	<	@SuppressWarnings("unchecked") private final void internalPutAll
1988	<	(Map<? extends K, ? extends V> m) {
1989	<	tryPresize(m.size());
1990	<	long delta = 0L;     // number of uncommitted additions
1991	<	boolean npe = false; // to throw exception on exit for nulls
1992	<	try {                // to clean up counts on other exceptions
1993	<	for (Map.Entry<?, ? extends V> entry : m.entrySet()) {
1994	<	Object k; V v;
1995	<	if (entry == null || (k = entry.getKey()) == null ||
1996	<	(v = entry.getValue()) == null) {
1997	<	npe = true;
1998	<	break;
1999	<	}
2000	<	int h = spread(k.hashCode());
2001	<	for (Node<V>[] tab = table;;) {
2002	<	int i; Node<V> f; int fh; Object fk;
2003	<	if (tab == null)
2004	<	tab = initTable();
2005	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
2006	<	if (casTabAt(tab, i, null, new Node<V>(h, k, v, null))) {
2007	<	++delta;
2008	<	break;
2009	<	}
2010	<	}
2011	<	else if ((fh = f.hash) < 0) {
2012	<	if ((fk = f.key) instanceof TreeBin) {
2013	<	TreeBin<V> t = (TreeBin<V>)fk;
2014	<	boolean validated = false;
2015	<	t.acquire(0);
2016	<	try {
2017	<	if (tabAt(tab, i) == f) {
2018	<	validated = true;
2019	<	TreeNode<V> p = t.getTreeNode(h, k, t.root);
2020	<	if (p != null)
2021	<	p.val = v;
2022	<	else {
2023	<	t.putTreeNode(h, k, v);
2024	<	++delta;
2025	<	}
2026	<	}
2027	<	} finally {
2028	<	t.release(0);
2029	<	}
2030	<	if (validated)
2031	<	break;
2032	<	}
2033	<	else
2034	<	tab = (Node<V>[])fk;
2035	<	}
2036	<	else {
2037	<	int len = 0;
2038	<	synchronized (f) {
2039	<	if (tabAt(tab, i) == f) {
2040	<	len = 1;
2041	<	for (Node<V> e = f;; ++len) {
2042	<	Object ek; V ev;
2043	<	if (e.hash == h &&
2044	<	(ev = e.val) != null &&
2045	<	((ek = e.key) == k || k.equals(ek))) {
2046	<	e.val = v;
2047	<	break;
2048	<	}
2049	<	Node<V> last = e;
2050	<	if ((e = e.next) == null) {
2051	<	++delta;
2052	<	last.next = new Node<V>(h, k, v, null);
2053	<	if (len >= TREE_THRESHOLD)
2054	<	replaceWithTreeBin(tab, i, k);
2055	<	break;
2056	<	}
2057	<	}
2058	<	}
2059	<	}
2060	<	if (len != 0) {
2061	<	if (len > 1) {
2062	<	addCount(delta, len);
2063	<	delta = 0L;
2064	<	}
2065	<	break;
2066	<	}
2067	<	}
2068	<	}
2069	<	}
2070	<	} finally {
2071	<	if (delta != 0L)
2072	<	addCount(delta, 2);
2073	<	}
2074	<	if (npe)
1986	>	// Hashtable legacy methods
1987	>
1988	>	/**
1989	>	* Legacy method testing if some key maps into the specified value
1990	>	* in this table.  This method is identical in functionality to
1991	>	* {@link #containsValue(Object)}, and exists solely to ensure
1992	>	* full compatibility with class {@link java.util.Hashtable},
1993	>	* which supported this method prior to introduction of the
1994	>	* Java Collections framework.
1995	>	*
1996	>	* @param  value a value to search for
1997	>	* @return {@code true} if and only if some key maps to the
1998	>	*         {@code value} argument in this table as
1999	>	*         determined by the {@code equals} method;
2000	>	*         {@code false} otherwise
2001	>	* @throws NullPointerException if the specified value is null
2002	>	*/
2003	>	@Deprecated public boolean contains(Object value) {
2004	>	return containsValue(value);
2005	>	}
2006	>
2007	>	/**
2008	>	* Returns an enumeration of the keys in this table.
2009	>	*
2010	>	* @return an enumeration of the keys in this table
2011	>	* @see #keySet()
2012	>	*/
2013	>	public Enumeration<K> keys() {
2014	>	Node<K,V>[] t;
2015	>	int f = (t = table) == null ? 0 : t.length;
2016	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2017	>	}
2018	>
2019	>	/**
2020	>	* Returns an enumeration of the values in this table.
2021	>	*
2022	>	* @return an enumeration of the values in this table
2023	>	* @see #values()
2024	>	*/
2025	>	public Enumeration<V> elements() {
2026	>	Node<K,V>[] t;
2027	>	int f = (t = table) == null ? 0 : t.length;
2028	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2029	>	}
2030	>
2031	>	// ConcurrentHashMap-only methods
2032	>
2033	>	/**
2034	>	* Returns the number of mappings. This method should be used
2035	>	* instead of {@link #size} because a ConcurrentHashMap may
2036	>	* contain more mappings than can be represented as an int. The
2037	>	* value returned is an estimate; the actual count may differ if
2038	>	* there are concurrent insertions or removals.
2039	>	*
2040	>	* @return the number of mappings
2041	>	* @since 1.8
2042	>	*/
2043	>	public long mappingCount() {
2044	>	long n = sumCount();
2045	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2046	>	}
2047	>
2048	>	/**
2049	>	* Creates a new {@link Set} backed by a ConcurrentHashMap
2050	>	* from the given type to {@code Boolean.TRUE}.
2051	>	*
2052	>	* @return the new set
2053	>	* @since 1.8
2054	>	*/
2055	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2056	>	return new KeySetView<K,Boolean>
2057	>	(new ConcurrentHashMap<K,Boolean>(), Boolean.TRUE);
2058	>	}
2059	>
2060	>	/**
2061	>	* Creates a new {@link Set} backed by a ConcurrentHashMap
2062	>	* from the given type to {@code Boolean.TRUE}.
2063	>	*
2064	>	* @param initialCapacity The implementation performs internal
2065	>	* sizing to accommodate this many elements.
2066	>	* @throws IllegalArgumentException if the initial capacity of
2067	>	* elements is negative
2068	>	* @return the new set
2069	>	* @since 1.8
2070	>	*/
2071	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2072	>	return new KeySetView<K,Boolean>
2073	>	(new ConcurrentHashMap<K,Boolean>(initialCapacity), Boolean.TRUE);
2074	>	}
2075	>
2076	>	/**
2077	>	* Returns a {@link Set} view of the keys in this map, using the
2078	>	* given common mapped value for any additions (i.e., {@link
2079	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2080	>	* This is of course only appropriate if it is acceptable to use
2081	>	* the same value for all additions from this view.
2082	>	*
2083	>	* @param mappedValue the mapped value to use for any additions
2084	>	* @return the set view
2085	>	* @throws NullPointerException if the mappedValue is null
2086	>	*/
2087	>	public KeySetView<K,V> keySet(V mappedValue) {
2088	>	if (mappedValue == null)
2089		throw new NullPointerException();
2090	+	return new KeySetView<K,V>(this, mappedValue);
2091		}
2092
2093	+	/* ---------------- Special Nodes -------------- */
2094	+
2095		/**
2096	<	* Implementation for clear. Steps through each bin, removing all
1714	<	* nodes.
2096	>	* A node inserted at head of bins during transfer operations.
2097		*/
2098	<	@SuppressWarnings("unchecked") private final void internalClear() {
2099	<	long delta = 0L; // negative number of deletions
2100	<	int i = 0;
2101	<	Node<V>[] tab = table;
2102	<	while (tab != null && i < tab.length) {
2103	<	Node<V> f = tabAt(tab, i);
2104	<	if (f == null)
2105	<	++i;
2106	<	else if (f.hash < 0) {
2107	<	Object fk;
2108	<	if ((fk = f.key) instanceof TreeBin) {
2109	<	TreeBin<V> t = (TreeBin<V>)fk;
2110	<	t.acquire(0);
2111	<	try {
2112	<	if (tabAt(tab, i) == f) {
2113	<	for (Node<V> p = t.first; p != null; p = p.next) {
2114	<	if (p.val != null) { // (currently always true)
2115	<	p.val = null;
2116	<	--delta;
2117	<	}
1736	<	}
1737	<	t.first = null;
1738	<	t.root = null;
1739	<	++i;
1740	<	}
1741	<	} finally {
1742	<	t.release(0);
1743	<	}
1744	<	}
1745	<	else
1746	<	tab = (Node<V>[])fk;
1747	<	}
1748	<	else {
1749	<	synchronized (f) {
1750	<	if (tabAt(tab, i) == f) {
1751	<	for (Node<V> e = f; e != null; e = e.next) {
1752	<	if (e.val != null) {  // (currently always true)
1753	<	e.val = null;
1754	<	--delta;
1755	<	}
1756	<	}
1757	<	setTabAt(tab, i, null);
1758	<	++i;
1759	<	}
1760	<	}
2098	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2099	>	final Node<K,V>[] nextTable;
2100	>	ForwardingNode(Node<K,V>[] tab) {
2101	>	super(MOVED, null, null, null);
2102	>	this.nextTable = tab;
2103	>	}
2104	>
2105	>	Node<K,V> find(int h, Object k) {
2106	>	Node<K,V> e; int n;
2107	>	Node<K,V>[] tab = nextTable;
2108	>	if (k != null && tab != null && (n = tab.length) > 0 &&
2109	>	(e = tabAt(tab, (n - 1) & h)) != null) {
2110	>	do {
2111	>	int eh; K ek;
2112	>	if ((eh = e.hash) == h &&
2113	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2114	>	return e;
2115	>	if (eh < 0)
2116	>	return e.find(h, k);
2117	>	} while ((e = e.next) != null);
2118		}
2119	+	return null;
2120		}
1763	–	if (delta != 0L)
1764	–	addCount(delta, -1);
2121		}
2122
1767	–	/* ---------------- Table Initialization and Resizing -------------- */
1768	–
2123		/**
2124	<	* Returns a power of two table size for the given desired capacity.
1771	<	* See Hackers Delight, sec 3.2
2124	>	* A place-holder node used in computeIfAbsent and compute
2125		*/
2126	<	private static final int tableSizeFor(int c) {
2127	<	int n = c - 1;
2128	<	n |= n >>> 1;
2129	<	n |= n >>> 2;
2130	<	n |= n >>> 4;
2131	<	n |= n >>> 8;
2132	<	n |= n >>> 16;
2133	<	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
2126	>	static final class ReservationNode<K,V> extends Node<K,V> {
2127	>	ReservationNode() {
2128	>	super(RESERVED, null, null, null);
2129	>	}
2130	>
2131	>	Node<K,V> find(int h, Object k) {
2132	>	return null;
2133	>	}
2134		}
2135
2136	+	/* ---------------- Table Initialization and Resizing -------------- */
2137	+
2138		/**
2139		* Initializes table, using the size recorded in sizeCtl.
2140		*/
2141	<	@SuppressWarnings("unchecked") private final Node<V>[] initTable() {
2142	<	Node<V>[] tab; int sc;
2143	<	while ((tab = table) == null) {
2141	>	private final Node<K,V>[] initTable() {
2142	>	Node<K,V>[] tab; int sc;
2143	>	while ((tab = table) == null || tab.length == 0) {
2144		if ((sc = sizeCtl) < 0)
2145		Thread.yield(); // lost initialization race; just spin
2146		else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2147		try {
2148	<	if ((tab = table) == null) {
2148	>	if ((tab = table) == null || tab.length == 0) {
2149		int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2150	<	@SuppressWarnings("rawtypes") Node[] tb = new Node[n];
2151	<	table = tab = (Node<V>[])tb;
2150	>	@SuppressWarnings({"rawtypes","unchecked"})
2151	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n];
2152	>	table = tab = nt;
2153		sc = n - (n >>> 2);
2154		}
2155		} finally {
#	Line 1816 | Line 2172 | public class ConcurrentHashMap<K, V>
2172		* @param check if <0, don't check resize, if <= 1 only check if uncontended
2173		*/
2174		private final void addCount(long x, int check) {
2175	<	Cell[] as; long b, s;
2175	>	CounterCell[] as; long b, s;
2176		if ((as = counterCells) != null ||
2177		!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2178	<	Cell a; long v; int m;
2178	>	CounterCell a; long v; int m;
2179		boolean uncontended = true;
2180		if (as == null || (m = as.length - 1) < 0 ||
2181		(a = as[ThreadLocalRandom.getProbe() & m]) == null ||
#	Line 1833 | Line 2189 | public class ConcurrentHashMap<K, V>
2189		s = sumCount();
2190		}
2191		if (check >= 0) {
2192	<	Node<V>[] tab, nt; int sc;
2192	>	Node<K,V>[] tab, nt; int sc;
2193		while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2194		tab.length < MAXIMUM_CAPACITY) {
2195		if (sc < 0) {
#	Line 1851 | Line 2207 | public class ConcurrentHashMap<K, V>
2207		}
2208
2209		/**
2210	+	* Helps transfer if a resize is in progress.
2211	+	*/
2212	+	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2213	+	Node<K,V>[] nextTab; int sc;
2214	+	if ((f instanceof ForwardingNode) &&
2215	+	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2216	+	if (nextTab == nextTable && tab == table &&
2217	+	transferIndex > transferOrigin && (sc = sizeCtl) < -1 &&
2218	+	U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2219	+	transfer(tab, nextTab);
2220	+	return nextTab;
2221	+	}
2222	+	return table;
2223	+	}
2224	+
2225	+	/**
2226		* Tries to presize table to accommodate the given number of elements.
2227		*
2228		* @param size number of elements (doesn't need to be perfectly accurate)
2229		*/
2230	<	@SuppressWarnings("unchecked") private final void tryPresize(int size) {
2230	>	private final void tryPresize(int size) {
2231		int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2232		tableSizeFor(size + (size >>> 1) + 1);
2233		int sc;
2234		while ((sc = sizeCtl) >= 0) {
2235	<	Node<V>[] tab = table; int n;
2235	>	Node<K,V>[] tab = table; int n;
2236		if (tab == null || (n = tab.length) == 0) {
2237		n = (sc > c) ? sc : c;
2238		if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2239		try {
2240		if (table == tab) {
2241	<	@SuppressWarnings("rawtypes") Node[] tb = new Node[n];
2242	<	table = (Node<V>[])tb;
2241	>	@SuppressWarnings({"rawtypes","unchecked"})
2242	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n];
2243	>	table = nt;
2244		sc = n - (n >>> 2);
2245		}
2246		} finally {
#	Line 1887 | Line 2260 | public class ConcurrentHashMap<K, V>
2260		* Moves and/or copies the nodes in each bin to new table. See
2261		* above for explanation.
2262		*/
2263	<	@SuppressWarnings("unchecked") private final void transfer
1891	<	(Node<V>[] tab, Node<V>[] nextTab) {
2263	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2264		int n = tab.length, stride;
2265		if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2266		stride = MIN_TRANSFER_STRIDE; // subdivide range
2267		if (nextTab == null) {            // initiating
2268		try {
2269	<	@SuppressWarnings("rawtypes") Node[] tb = new Node[n << 1];
2270	<	nextTab = (Node<V>[])tb;
2269	>	@SuppressWarnings({"rawtypes","unchecked"})
2270	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n << 1];
2271	>	nextTab = nt;
2272		} catch (Throwable ex) {      // try to cope with OOME
2273		sizeCtl = Integer.MAX_VALUE;
2274		return;
#	Line 1903 | Line 2276 | public class ConcurrentHashMap<K, V>
2276		nextTable = nextTab;
2277		transferOrigin = n;
2278		transferIndex = n;
2279	<	Node<V> rev = new Node<V>(MOVED, tab, null, null);
2279	>	ForwardingNode<K,V> rev = new ForwardingNode<K,V>(tab);
2280		for (int k = n; k > 0;) {    // progressively reveal ready slots
2281		int nextk = (k > stride) ? k - stride : 0;
2282		for (int m = nextk; m < k; ++m)
#	Line 1914 | Line 2287 | public class ConcurrentHashMap<K, V>
2287		}
2288		}
2289		int nextn = nextTab.length;
2290	<	Node<V> fwd = new Node<V>(MOVED, nextTab, null, null);
2290	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2291		boolean advance = true;
2292		for (int i = 0, bound = 0;;) {
2293	<	int nextIndex, nextBound; Node<V> f; Object fk;
2293	>	int nextIndex, nextBound, fh; Node<K,V> f;
2294		while (advance) {
2295		if (--i >= bound)
2296		advance = false;
#	Line 1953 | Line 2326 | public class ConcurrentHashMap<K, V>
2326		advance = true;
2327		}
2328		}
2329	<	else if (f.hash >= 0) {
2329	>	else if ((fh = f.hash) == MOVED)
2330	>	advance = true; // already processed
2331	>	else {
2332		synchronized (f) {
2333		if (tabAt(tab, i) == f) {
2334	<	int runBit = f.hash & n;
2335	<	Node<V> lastRun = f, lo = null, hi = null;
2336	<	for (Node<V> p = f.next; p != null; p = p.next) {
2337	<	int b = p.hash & n;
2338	<	if (b != runBit) {
2339	<	runBit = b;
2340	<	lastRun = p;
2334	>	Node<K,V> ln, hn;
2335	>	if (fh >= 0) {
2336	>	int runBit = fh & n;
2337	>	Node<K,V> lastRun = f;
2338	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2339	>	int b = p.hash & n;
2340	>	if (b != runBit) {
2341	>	runBit = b;
2342	>	lastRun = p;
2343	>	}
2344		}
2345	<	}
2346	<	if (runBit == 0)
2347	<	lo = lastRun;
1970	<	else
1971	<	hi = lastRun;
1972	<	for (Node<V> p = f; p != lastRun; p = p.next) {
1973	<	int ph = p.hash;
1974	<	Object pk = p.key; V pv = p.val;
1975	<	if ((ph & n) == 0)
1976	<	lo = new Node<V>(ph, pk, pv, lo);
1977	<	else
1978	<	hi = new Node<V>(ph, pk, pv, hi);
1979	<	}
1980	<	setTabAt(nextTab, i, lo);
1981	<	setTabAt(nextTab, i + n, hi);
1982	<	setTabAt(tab, i, fwd);
1983	<	advance = true;
1984	<	}
1985	<	}
1986	<	}
1987	<	else if ((fk = f.key) instanceof TreeBin) {
1988	<	TreeBin<V> t = (TreeBin<V>)fk;
1989	<	t.acquire(0);
1990	<	try {
1991	<	if (tabAt(tab, i) == f) {
1992	<	TreeBin<V> lt = new TreeBin<V>();
1993	<	TreeBin<V> ht = new TreeBin<V>();
1994	<	int lc = 0, hc = 0;
1995	<	for (Node<V> e = t.first; e != null; e = e.next) {
1996	<	int h = e.hash;
1997	<	Object k = e.key; V v = e.val;
1998	<	if ((h & n) == 0) {
1999	<	++lc;
2000	<	lt.putTreeNode(h, k, v);
2345	>	if (runBit == 0) {
2346	>	ln = lastRun;
2347	>	hn = null;
2348		}
2349		else {
2350	<	++hc;
2351	<	ht.putTreeNode(h, k, v);
2350	>	hn = lastRun;
2351	>	ln = null;
2352	>	}
2353	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2354	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2355	>	if ((ph & n) == 0)
2356	>	ln = new Node<K,V>(ph, pk, pv, ln);
2357	>	else
2358	>	hn = new Node<K,V>(ph, pk, pv, hn);
2359		}
2360		}
2361	<	Node<V> ln, hn; // throw away trees if too small
2362	<	if (lc < TREE_THRESHOLD) {
2363	<	ln = null;
2364	<	for (Node<V> p = lt.first; p != null; p = p.next)
2365	<	ln = new Node<V>(p.hash, p.key, p.val, ln);
2361	>	else if (f instanceof TreeBin) {
2362	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2363	>	TreeNode<K,V> lo = null, loTail = null;
2364	>	TreeNode<K,V> hi = null, hiTail = null;
2365	>	int lc = 0, hc = 0;
2366	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2367	>	int h = e.hash;
2368	>	TreeNode<K,V> p = new TreeNode<K,V>
2369	>	(h, e.key, e.val, null, null);
2370	>	if ((h & n) == 0) {
2371	>	if ((p.prev = loTail) == null)
2372	>	lo = p;
2373	>	else
2374	>	loTail.next = p;
2375	>	loTail = p;
2376	>	++lc;
2377	>	}
2378	>	else {
2379	>	if ((p.prev = hiTail) == null)
2380	>	hi = p;
2381	>	else
2382	>	hiTail.next = p;
2383	>	hiTail = p;
2384	>	++hc;
2385	>	}
2386	>	}
2387	>	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2388	>	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2389	>	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2390	>	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2391		}
2392		else
2393	<	ln = new Node<V>(MOVED, lt, null, null);
2393	>	ln = hn = null;
2394		setTabAt(nextTab, i, ln);
2016	–	if (hc < TREE_THRESHOLD) {
2017	–	hn = null;
2018	–	for (Node<V> p = ht.first; p != null; p = p.next)
2019	–	hn = new Node<V>(p.hash, p.key, p.val, hn);
2020	–	}
2021	–	else
2022	–	hn = new Node<V>(MOVED, ht, null, null);
2395		setTabAt(nextTab, i + n, hn);
2396		setTabAt(tab, i, fwd);
2397		advance = true;
2398		}
2027	–	} finally {
2028	–	t.release(0);
2399		}
2400		}
2031	–	else
2032	–	advance = true; // already processed
2401		}
2402		}
2403
2404		/* ---------------- Counter support -------------- */
2405
2406	+	/**
2407	+	* A padded cell for distributing counts.  Adapted from LongAdder
2408	+	* and Striped64.  See their internal docs for explanation.
2409	+	*/
2410	+	@sun.misc.Contended static final class CounterCell {
2411	+	volatile long value;
2412	+	CounterCell(long x) { value = x; }
2413	+	}
2414	+
2415		final long sumCount() {
2416	<	Cell[] as = counterCells; Cell a;
2416	>	CounterCell[] as = counterCells; CounterCell a;
2417		long sum = baseCount;
2418		if (as != null) {
2419		for (int i = 0; i < as.length; ++i) {
#	Line 2057 | Line 2434 | public class ConcurrentHashMap<K, V>
2434		}
2435		boolean collide = false;                // True if last slot nonempty
2436		for (;;) {
2437	<	Cell[] as; Cell a; int n; long v;
2437	>	CounterCell[] as; CounterCell a; int n; long v;
2438		if ((as = counterCells) != null && (n = as.length) > 0) {
2439		if ((a = as[(n - 1) & h]) == null) {
2440		if (cellsBusy == 0) {            // Try to attach new Cell
2441	<	Cell r = new Cell(x); // Optimistic create
2441	>	CounterCell r = new CounterCell(x); // Optimistic create
2442		if (cellsBusy == 0 &&
2443		U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
2444		boolean created = false;
2445		try {               // Recheck under lock
2446	<	Cell[] rs; int m, j;
2446	>	CounterCell[] rs; int m, j;
2447		if ((rs = counterCells) != null &&
2448		(m = rs.length) > 0 &&
2449		rs[j = (m - 1) & h] == null) {
#	Line 2095 | Line 2472 | public class ConcurrentHashMap<K, V>
2472		U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
2473		try {
2474		if (counterCells == as) {// Expand table unless stale
2475	<	Cell[] rs = new Cell[n << 1];
2475	>	CounterCell[] rs = new CounterCell[n << 1];
2476		for (int i = 0; i < n; ++i)
2477		rs[i] = as[i];
2478		counterCells = rs;
#	Line 2113 | Line 2490 | public class ConcurrentHashMap<K, V>
2490		boolean init = false;
2491		try {                           // Initialize table
2492		if (counterCells == as) {
2493	<	Cell[] rs = new Cell[2];
2494	<	rs[h & 1] = new Cell(x);
2493	>	CounterCell[] rs = new CounterCell[2];
2494	>	rs[h & 1] = new CounterCell(x);
2495		counterCells = rs;
2496		init = true;
2497		}
#	Line 2129 | Line 2506 | public class ConcurrentHashMap<K, V>
2506		}
2507		}
2508
2509	<	/* ----------------Table Traversal -------------- */
2509	>	/* ---------------- Conversion from/to TreeBins -------------- */
2510
2511		/**
2512	<	* Encapsulates traversal for methods such as containsValue; also
2513	<	* serves as a base class for other iterators and bulk tasks.
2514	<	*
2515	<	* At each step, the iterator snapshots the key ("nextKey") and
2516	<	* value ("nextVal") of a valid node (i.e., one that, at point of
2517	<	* snapshot, has a non-null user value). Because val fields can
2518	<	* change (including to null, indicating deletion), field nextVal
2519	<	* might not be accurate at point of use, but still maintains the
2520	<	* weak consistency property of holding a value that was once
2521	<	* valid. To support iterator.remove, the nextKey field is not
2145	<	* updated (nulled out) when the iterator cannot advance.
2146	<	*
2147	<	* Internal traversals directly access these fields, as in:
2148	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2149	<	*
2150	<	* Exported iterators must track whether the iterator has advanced
2151	<	* (in hasNext vs next) (by setting/checking/nulling field
2152	<	* nextVal), and then extract key, value, or key-value pairs as
2153	<	* return values of next().
2154	<	*
2155	<	* The iterator visits once each still-valid node that was
2156	<	* reachable upon iterator construction. It might miss some that
2157	<	* were added to a bin after the bin was visited, which is OK wrt
2158	<	* consistency guarantees. Maintaining this property in the face
2159	<	* of possible ongoing resizes requires a fair amount of
2160	<	* bookkeeping state that is difficult to optimize away amidst
2161	<	* volatile accesses.  Even so, traversal maintains reasonable
2162	<	* throughput.
2163	<	*
2164	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2165	<	* However, if the table has been resized, then all future steps
2166	<	* must traverse both the bin at the current index as well as at
2167	<	* (index + baseSize); and so on for further resizings. To
2168	<	* paranoically cope with potential sharing by users of iterators
2169	<	* across threads, iteration terminates if a bounds checks fails
2170	<	* for a table read.
2171	<	*
2172	<	* This class supports both Spliterator-based traversal and
2173	<	* CountedCompleter-based bulk tasks. The same "batch" field is
2174	<	* used, but in slightly different ways, in the two cases.  For
2175	<	* Spliterators, it is a saturating (at Integer.MAX_VALUE)
2176	<	* estimate of element coverage. For CHM tasks, it is a pre-scaled
2177	<	* size that halves down to zero for leaf tasks, that is only
2178	<	* computed upon execution of the task. (Tasks can be submitted to
2179	<	* any pool, of any size, so we don't know scale factors until
2180	<	* running.)
2181	<	*
2182	<	* This class extends CountedCompleter to streamline parallel
2183	<	* iteration in bulk operations. This adds only a few fields of
2184	<	* space overhead, which is small enough in cases where it is not
2185	<	* needed to not worry about it.  Because CountedCompleter is
2186	<	* Serializable, but iterators need not be, we need to add warning
2187	<	* suppressions.
2188	<	*/
2189	<	@SuppressWarnings("serial") static class Traverser<K,V,R>
2190	<	extends CountedCompleter<R> {
2191	<	final ConcurrentHashMap<K, V> map;
2192	<	Node<V> next;        // the next entry to use
2193	<	K nextKey;           // cached key field of next
2194	<	V nextVal;           // cached val field of next
2195	<	Node<V>[] tab;       // current table; updated if resized
2196	<	int index;           // index of bin to use next
2197	<	int baseIndex;       // current index of initial table
2198	<	int baseLimit;       // index bound for initial table
2199	<	int baseSize;        // initial table size
2200	<	int batch;           // split control
2201	<	/** Creates iterator for all entries in the table. */
2202	<	Traverser(ConcurrentHashMap<K, V> map) {
2203	<	this.map = map;
2204	<	Node<V>[] t;
2205	<	if ((t = tab = map.table) != null)
2206	<	baseLimit = baseSize = t.length;
2207	<	}
2208	<
2209	<	/** Task constructor */
2210	<	Traverser(ConcurrentHashMap<K,V> map, Traverser<K,V,?> it, int batch) {
2211	<	super(it);
2212	<	this.map = map;
2213	<	this.batch = batch; // -1 if unknown
2214	<	if (it == null) {
2215	<	Node<V>[] t;
2216	<	if ((t = tab = map.table) != null)
2217	<	baseLimit = baseSize = t.length;
2218	<	}
2219	<	else { // split parent
2220	<	this.tab = it.tab;
2221	<	this.baseSize = it.baseSize;
2222	<	int hi = this.baseLimit = it.baseLimit;
2223	<	it.baseLimit = this.index = this.baseIndex =
2224	<	(hi + it.baseIndex + 1) >>> 1;
2225	<	}
2226	<	}
2227	<
2228	<	/** Spliterator constructor */
2229	<	Traverser(ConcurrentHashMap<K,V> map, Traverser<K,V,?> it) {
2230	<	super(it);
2231	<	this.map = map;
2232	<	if (it == null) {
2233	<	Node<V>[] t;
2234	<	if ((t = tab = map.table) != null)
2235	<	baseLimit = baseSize = t.length;
2236	<	long n = map.sumCount();
2237	<	batch = ((n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
2238	<	(int)n);
2239	<	}
2240	<	else {
2241	<	this.tab = it.tab;
2242	<	this.baseSize = it.baseSize;
2243	<	int hi = this.baseLimit = it.baseLimit;
2244	<	it.baseLimit = this.index = this.baseIndex =
2245	<	(hi + it.baseIndex + 1) >>> 1;
2246	<	this.batch = it.batch >>>= 1;
2512	>	* Replaces all linked nodes in bin at given index unless table is
2513	>	* too small, in which case resizes instead.
2514	>	*/
2515	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2516	>	Node<K,V> b; int n, sc;
2517	>	if (tab != null) {
2518	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY) {
2519	>	if (tab == table && (sc = sizeCtl) >= 0 &&
2520	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2521	>	transfer(tab, null);
2522		}
2523	<	}
2524	<
2525	<	/**
2526	<	* Advances next; returns nextVal or null if terminated.
2527	<	* See above for explanation.
2528	<	*/
2529	<	@SuppressWarnings("unchecked") final V advance() {
2530	<	Node<V> e = next;
2531	<	V ev = null;
2532	<	outer: do {
2533	<	if (e != null)                  // advance past used/skipped node
2534	<	e = e.next;
2535	<	while (e == null) {             // get to next non-null bin
2261	<	ConcurrentHashMap<K, V> m;
2262	<	Node<V>[] t; int b, i, n; Object ek; //  must use locals
2263	<	if ((t = tab) != null)
2264	<	n = t.length;
2265	<	else if ((m = map) != null && (t = tab = m.table) != null)
2266	<	n = baseLimit = baseSize = t.length;
2267	<	else
2268	<	break outer;
2269	<	if ((b = baseIndex) >= baseLimit ||
2270	<	(i = index) < 0 || i >= n)
2271	<	break outer;
2272	<	if ((e = tabAt(t, i)) != null && e.hash < 0) {
2273	<	if ((ek = e.key) instanceof TreeBin)
2274	<	e = ((TreeBin<V>)ek).first;
2275	<	else {
2276	<	tab = (Node<V>[])ek;
2277	<	continue;           // restarts due to null val
2523	>	else if ((b = tabAt(tab, index)) != null) {
2524	>	synchronized (b) {
2525	>	if (tabAt(tab, index) == b) {
2526	>	TreeNode<K,V> hd = null, tl = null;
2527	>	for (Node<K,V> e = b; e != null; e = e.next) {
2528	>	TreeNode<K,V> p =
2529	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2530	>	null, null);
2531	>	if ((p.prev = tl) == null)
2532	>	hd = p;
2533	>	else
2534	>	tl.next = p;
2535	>	tl = p;
2536		}
2537	<	}                           // visit upper slots if present
2538	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2537	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2538	>	}
2539		}
2540	<	nextKey = (K)e.key;
2283	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2284	<	next = e;
2285	<	return nextVal = ev;
2286	<	}
2287	<
2288	<	public final void remove() {
2289	<	K k = nextKey;
2290	<	if (k == null && (advance() == null || (k = nextKey) == null))
2291	<	throw new IllegalStateException();
2292	<	map.internalReplace(k, null, null);
2293	<	}
2294	<
2295	<	public final boolean hasNext() {
2296	<	return nextVal != null || advance() != null;
2297	<	}
2298	<
2299	<	public final boolean hasMoreElements() { return hasNext(); }
2300	<
2301	<	public void compute() { } // default no-op CountedCompleter body
2302	<
2303	<	/**
2304	<	* Returns a batch value > 0 if this task should (and must) be
2305	<	* split, if so, adding to pending count, and in any case
2306	<	* updating batch value. The initial batch value is approx
2307	<	* exp2 of the number of times (minus one) to split task by
2308	<	* two before executing leaf action. This value is faster to
2309	<	* compute and more convenient to use as a guide to splitting
2310	<	* than is the depth, since it is used while dividing by two
2311	<	* anyway.
2312	<	*/
2313	<	final int preSplit() {
2314	<	int b;  ForkJoinPool pool;
2315	<	if ((b = batch) < 0) { // force initialization
2316	<	int sp = (((pool = getPool()) == null) ?
2317	<	ForkJoinPool.getCommonPoolParallelism() :
2318	<	pool.getParallelism()) << 3; // slack of 8
2319	<	long n = map.sumCount();
2320	<	b = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
2321	<	}
2322	<	b = (b <= 1 || baseIndex == baseLimit) ? 0 : (b >>> 1);
2323	<	if ((batch = b) > 0)
2324	<	addToPendingCount(1);
2325	<	return b;
2326	<	}
2327	<
2328	<	// spliterator support
2329	<
2330	<	public boolean hasExactSize() {
2331	<	return false;
2332	<	}
2333	<
2334	<	public boolean hasExactSplits() {
2335	<	return false;
2336	<	}
2337	<
2338	<	public long estimateSize() {
2339	<	return batch;
2540	>	}
2541		}
2542		}
2543
2343	–	/* ---------------- Public operations -------------- */
2344	–
2345	–	/**
2346	–	* Creates a new, empty map with the default initial table size (16).
2347	–	*/
2348	–	public ConcurrentHashMap() {
2349	–	}
2350	–
2351	–	/**
2352	–	* Creates a new, empty map with an initial table size
2353	–	* accommodating the specified number of elements without the need
2354	–	* to dynamically resize.
2355	–	*
2356	–	* @param initialCapacity The implementation performs internal
2357	–	* sizing to accommodate this many elements.
2358	–	* @throws IllegalArgumentException if the initial capacity of
2359	–	* elements is negative
2360	–	*/
2361	–	public ConcurrentHashMap(int initialCapacity) {
2362	–	if (initialCapacity < 0)
2363	–	throw new IllegalArgumentException();
2364	–	int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
2365	–	MAXIMUM_CAPACITY :
2366	–	tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2367	–	this.sizeCtl = cap;
2368	–	}
2369	–
2370	–	/**
2371	–	* Creates a new map with the same mappings as the given map.
2372	–	*
2373	–	* @param m the map
2374	–	*/
2375	–	public ConcurrentHashMap(Map<? extends K, ? extends V> m) {
2376	–	this.sizeCtl = DEFAULT_CAPACITY;
2377	–	internalPutAll(m);
2378	–	}
2379	–
2380	–	/**
2381	–	* Creates a new, empty map with an initial table size based on
2382	–	* the given number of elements ({@code initialCapacity}) and
2383	–	* initial table density ({@code loadFactor}).
2384	–	*
2385	–	* @param initialCapacity the initial capacity. The implementation
2386	–	* performs internal sizing to accommodate this many elements,
2387	–	* given the specified load factor.
2388	–	* @param loadFactor the load factor (table density) for
2389	–	* establishing the initial table size
2390	–	* @throws IllegalArgumentException if the initial capacity of
2391	–	* elements is negative or the load factor is nonpositive
2392	–	*
2393	–	* @since 1.6
2394	–	*/
2395	–	public ConcurrentHashMap(int initialCapacity, float loadFactor) {
2396	–	this(initialCapacity, loadFactor, 1);
2397	–	}
2398	–
2399	–	/**
2400	–	* Creates a new, empty map with an initial table size based on
2401	–	* the given number of elements ({@code initialCapacity}), table
2402	–	* density ({@code loadFactor}), and number of concurrently
2403	–	* updating threads ({@code concurrencyLevel}).
2404	–	*
2405	–	* @param initialCapacity the initial capacity. The implementation
2406	–	* performs internal sizing to accommodate this many elements,
2407	–	* given the specified load factor.
2408	–	* @param loadFactor the load factor (table density) for
2409	–	* establishing the initial table size
2410	–	* @param concurrencyLevel the estimated number of concurrently
2411	–	* updating threads. The implementation may use this value as
2412	–	* a sizing hint.
2413	–	* @throws IllegalArgumentException if the initial capacity is
2414	–	* negative or the load factor or concurrencyLevel are
2415	–	* nonpositive
2416	–	*/
2417	–	public ConcurrentHashMap(int initialCapacity,
2418	–	float loadFactor, int concurrencyLevel) {
2419	–	if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
2420	–	throw new IllegalArgumentException();
2421	–	if (initialCapacity < concurrencyLevel)   // Use at least as many bins
2422	–	initialCapacity = concurrencyLevel;   // as estimated threads
2423	–	long size = (long)(1.0 + (long)initialCapacity / loadFactor);
2424	–	int cap = (size >= (long)MAXIMUM_CAPACITY) ?
2425	–	MAXIMUM_CAPACITY : tableSizeFor((int)size);
2426	–	this.sizeCtl = cap;
2427	–	}
2428	–
2429	–	/**
2430	–	* Creates a new {@link Set} backed by a ConcurrentHashMap
2431	–	* from the given type to {@code Boolean.TRUE}.
2432	–	*
2433	–	* @return the new set
2434	–	*/
2435	–	public static <K> KeySetView<K,Boolean> newKeySet() {
2436	–	return new KeySetView<K,Boolean>(new ConcurrentHashMap<K,Boolean>(),
2437	–	Boolean.TRUE);
2438	–	}
2439	–
2544		/**
2545	<	* Creates a new {@link Set} backed by a ConcurrentHashMap
2442	<	* from the given type to {@code Boolean.TRUE}.
2443	<	*
2444	<	* @param initialCapacity The implementation performs internal
2445	<	* sizing to accommodate this many elements.
2446	<	* @throws IllegalArgumentException if the initial capacity of
2447	<	* elements is negative
2448	<	* @return the new set
2545	>	* Returns a list on non-TreeNodes replacing those in given list
2546		*/
2547	<	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2548	<	return new KeySetView<K,Boolean>
2549	<	(new ConcurrentHashMap<K,Boolean>(initialCapacity), Boolean.TRUE);
2550	<	}
2551	<
2552	<	/**
2553	<	* {@inheritDoc}
2554	<	*/
2555	<	public boolean isEmpty() {
2556	<	return sumCount() <= 0L; // ignore transient negative values
2547	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2548	>	Node<K,V> hd = null, tl = null;
2549	>	for (Node<K,V> q = b; q != null; q = q.next) {
2550	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2551	>	if (tl == null)
2552	>	hd = p;
2553	>	else
2554	>	tl.next = p;
2555	>	tl = p;
2556	>	}
2557	>	return hd;
2558		}
2559
2560	<	/**
2463	<	* {@inheritDoc}
2464	<	*/
2465	<	public int size() {
2466	<	long n = sumCount();
2467	<	return ((n < 0L) ? 0 :
2468	<	(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
2469	<	(int)n);
2470	<	}
2560	>	/* ---------------- TreeNodes -------------- */
2561
2562		/**
2563	<	* Returns the number of mappings. This method should be used
2474	<	* instead of {@link #size} because a ConcurrentHashMap may
2475	<	* contain more mappings than can be represented as an int. The
2476	<	* value returned is an estimate; the actual count may differ if
2477	<	* there are concurrent insertions or removals.
2478	<	*
2479	<	* @return the number of mappings
2480	<	*/
2481	<	public long mappingCount() {
2482	<	long n = sumCount();
2483	<	return (n < 0L) ? 0L : n; // ignore transient negative values
2484	<	}
2485	<
2486	<	/**
2487	<	* Returns the value to which the specified key is mapped,
2488	<	* or {@code null} if this map contains no mapping for the key.
2489	<	*
2490	<	* <p>More formally, if this map contains a mapping from a key
2491	<	* {@code k} to a value {@code v} such that {@code key.equals(k)},
2492	<	* then this method returns {@code v}; otherwise it returns
2493	<	* {@code null}.  (There can be at most one such mapping.)
2494	<	*
2495	<	* @throws NullPointerException if the specified key is null
2563	>	* Nodes for use in TreeBins
2564		*/
2565	<	public V get(Object key) {
2566	<	return internalGet(key);
2567	<	}
2565	>	static final class TreeNode<K,V> extends Node<K,V> {
2566	>	TreeNode<K,V> parent;  // red-black tree links
2567	>	TreeNode<K,V> left;
2568	>	TreeNode<K,V> right;
2569	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2570	>	boolean red;
2571
2572	<	/**
2573	<	* Returns the value to which the specified key is mapped,
2574	<	* or the given defaultValue if this map contains no mapping for the key.
2575	<	*
2576	<	* @param key the key
2506	<	* @param defaultValue the value to return if this map contains
2507	<	* no mapping for the given key
2508	<	* @return the mapping for the key, if present; else the defaultValue
2509	<	* @throws NullPointerException if the specified key is null
2510	<	*/
2511	<	public V getValueOrDefault(Object key, V defaultValue) {
2512	<	V v;
2513	<	return (v = internalGet(key)) == null ? defaultValue : v;
2514	<	}
2572	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2573	>	TreeNode<K,V> parent) {
2574	>	super(hash, key, val, next);
2575	>	this.parent = parent;
2576	>	}
2577
2578	<	/**
2579	<	* Tests if the specified object is a key in this table.
2580	<	*
2519	<	* @param  key   possible key
2520	<	* @return {@code true} if and only if the specified object
2521	<	*         is a key in this table, as determined by the
2522	<	*         {@code equals} method; {@code false} otherwise
2523	<	* @throws NullPointerException if the specified key is null
2524	<	*/
2525	<	public boolean containsKey(Object key) {
2526	<	return internalGet(key) != null;
2527	<	}
2578	>	Node<K,V> find(int h, Object k) {
2579	>	return findTreeNode(h, k, null);
2580	>	}
2581
2582	<	/**
2583	<	* Returns {@code true} if this map maps one or more keys to the
2584	<	* specified value. Note: This method may require a full traversal
2585	<	* of the map, and is much slower than method {@code containsKey}.
2586	<	*
2587	<	* @param value value whose presence in this map is to be tested
2588	<	* @return {@code true} if this map maps one or more keys to the
2589	<	*         specified value
2590	<	* @throws NullPointerException if the specified value is null
2591	<	*/
2592	<	public boolean containsValue(Object value) {
2593	<	if (value == null)
2594	<	throw new NullPointerException();
2595	<	V v;
2596	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2597	<	while ((v = it.advance()) != null) {
2598	<	if (v == value || value.equals(v))
2599	<	return true;
2582	>	/**
2583	>	* Returns the TreeNode (or null if not found) for the given key
2584	>	* starting at given root.
2585	>	*/
2586	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2587	>	if (k != null) {
2588	>	TreeNode<K,V> p = this;
2589	>	do  {
2590	>	int ph, dir; K pk; TreeNode<K,V> q;
2591	>	TreeNode<K,V> pl = p.left, pr = p.right;
2592	>	if ((ph = p.hash) > h)
2593	>	p = pl;
2594	>	else if (ph < h)
2595	>	p = pr;
2596	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2597	>	return p;
2598	>	else if (pl == null && pr == null)
2599	>	break;
2600	>	else if ((kc != null ||
2601	>	(kc = comparableClassFor(k)) != null) &&
2602	>	(dir = compareComparables(kc, k, pk)) != 0)
2603	>	p = (dir < 0) ? pl : pr;
2604	>	else if (pl == null)
2605	>	p = pr;
2606	>	else if (pr == null ||
2607	>	(q = pr.findTreeNode(h, k, kc)) == null)
2608	>	p = pl;
2609	>	else
2610	>	return q;
2611	>	} while (p != null);
2612	>	}
2613	>	return null;
2614		}
2548	–	return false;
2615		}
2616
2617	<	/**
2552	<	* Legacy method testing if some key maps into the specified value
2553	<	* in this table.  This method is identical in functionality to
2554	<	* {@link #containsValue}, and exists solely to ensure
2555	<	* full compatibility with class {@link java.util.Hashtable},
2556	<	* which supported this method prior to introduction of the
2557	<	* Java Collections framework.
2558	<	*
2559	<	* @param  value a value to search for
2560	<	* @return {@code true} if and only if some key maps to the
2561	<	*         {@code value} argument in this table as
2562	<	*         determined by the {@code equals} method;
2563	<	*         {@code false} otherwise
2564	<	* @throws NullPointerException if the specified value is null
2565	<	*/
2566	<	@Deprecated public boolean contains(Object value) {
2567	<	return containsValue(value);
2568	<	}
2617	>	/* ---------------- TreeBins -------------- */
2618
2619		/**
2620	<	* Maps the specified key to the specified value in this table.
2621	<	* Neither the key nor the value can be null.
2622	<	*
2623	<	* <p>The value can be retrieved by calling the {@code get} method
2624	<	* with a key that is equal to the original key.
2625	<	*
2626	<	* @param key key with which the specified value is to be associated
2627	<	* @param value value to be associated with the specified key
2628	<	* @return the previous value associated with {@code key}, or
2629	<	*         {@code null} if there was no mapping for {@code key}
2630	<	* @throws NullPointerException if the specified key or value is null
2631	<	*/
2632	<	public V put(K key, V value) {
2633	<	return internalPut(key, value, false);
2634	<	}
2620	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2621	>	* keys or values, but instead point to list of TreeNodes and
2622	>	* their root. They also maintain a parasitic read-write lock
2623	>	* forcing writers (who hold bin lock) to wait for readers (who do
2624	>	* not) to complete before tree restructuring operations.
2625	>	*/
2626	>	static final class TreeBin<K,V> extends Node<K,V> {
2627	>	TreeNode<K,V> root;
2628	>	volatile TreeNode<K,V> first;
2629	>	volatile Thread waiter;
2630	>	volatile int lockState;
2631	>	// values for lockState
2632	>	static final int WRITER = 1; // set while holding write lock
2633	>	static final int WAITER = 2; // set when waiting for write lock
2634	>	static final int READER = 4; // increment value for setting read lock
2635	>
2636	>	/**
2637	>	* Creates bin with initial set of nodes headed by b.
2638	>	*/
2639	>	TreeBin(TreeNode<K,V> b) {
2640	>	super(TREEBIN, null, null, null);
2641	>	this.first = b;
2642	>	TreeNode<K,V> r = null;
2643	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2644	>	next = (TreeNode<K,V>)x.next;
2645	>	x.left = x.right = null;
2646	>	if (r == null) {
2647	>	x.parent = null;
2648	>	x.red = false;
2649	>	r = x;
2650	>	}
2651	>	else {
2652	>	Object key = x.key;
2653	>	int hash = x.hash;
2654	>	Class<?> kc = null;
2655	>	for (TreeNode<K,V> p = r;;) {
2656	>	int dir, ph;
2657	>	if ((ph = p.hash) > hash)
2658	>	dir = -1;
2659	>	else if (ph < hash)
2660	>	dir = 1;
2661	>	else if ((kc != null ||
2662	>	(kc = comparableClassFor(key)) != null))
2663	>	dir = compareComparables(kc, key, p.key);
2664	>	else
2665	>	dir = 0;
2666	>	TreeNode<K,V> xp = p;
2667	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2668	>	x.parent = xp;
2669	>	if (dir <= 0)
2670	>	xp.left = x;
2671	>	else
2672	>	xp.right = x;
2673	>	r = balanceInsertion(r, x);
2674	>	break;
2675	>	}
2676	>	}
2677	>	}
2678	>	}
2679	>	this.root = r;
2680	>	}
2681
2682	<	/**
2683	<	* {@inheritDoc}
2684	<	*
2685	<	* @return the previous value associated with the specified key,
2686	<	*         or {@code null} if there was no mapping for the key
2687	<	* @throws NullPointerException if the specified key or value is null
2688	<	*/
2594	<	public V putIfAbsent(K key, V value) {
2595	<	return internalPut(key, value, true);
2596	<	}
2682	>	/**
2683	>	* Acquires write lock for tree restructuring
2684	>	*/
2685	>	private final void lockRoot() {
2686	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2687	>	contendedLock(); // offload to separate method
2688	>	}
2689
2690	<	/**
2691	<	* Copies all of the mappings from the specified map to this one.
2692	<	* These mappings replace any mappings that this map had for any of the
2693	<	* keys currently in the specified map.
2694	<	*
2695	<	* @param m mappings to be stored in this map
2604	<	*/
2605	<	public void putAll(Map<? extends K, ? extends V> m) {
2606	<	internalPutAll(m);
2607	<	}
2690	>	/**
2691	>	* Releases write lock for tree restructuring
2692	>	*/
2693	>	private final void unlockRoot() {
2694	>	lockState = 0;
2695	>	}
2696
2697	<	/**
2698	<	* If the specified key is not already associated with a value (or
2699	<	* is mapped to {@code null}), attempts to compute its value using
2700	<	* the given mapping function and enters it into this map unless
2701	<	* {@code null}. The entire method invocation is performed
2702	<	* atomically, so the function is applied at most once per key.
2703	<	* Some attempted update operations on this map by other threads
2704	<	* may be blocked while computation is in progress, so the
2705	<	* computation should be short and simple, and must not attempt to
2706	<	* update any other mappings of this Map.
2707	<	*
2708	<	* @param key key with which the specified value is to be associated
2709	<	* @param mappingFunction the function to compute a value
2710	<	* @return the current (existing or computed) value associated with
2711	<	*         the specified key, or null if the computed value is null
2712	<	* @throws NullPointerException if the specified key or mappingFunction
2713	<	*         is null
2714	<	* @throws IllegalStateException if the computation detectably
2715	<	*         attempts a recursive update to this map that would
2716	<	*         otherwise never complete
2717	<	* @throws RuntimeException or Error if the mappingFunction does so,
2718	<	*         in which case the mapping is left unestablished
2719	<	*/
2632	<	public V computeIfAbsent
2633	<	(K key, Function<? super K, ? extends V> mappingFunction) {
2634	<	return internalComputeIfAbsent(key, mappingFunction);
2635	<	}
2697	>	/**
2698	>	* Possibly blocks awaiting root lock
2699	>	*/
2700	>	private final void contendedLock() {
2701	>	boolean waiting = false;
2702	>	for (int s;;) {
2703	>	if (((s = lockState) & WRITER) == 0) {
2704	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2705	>	if (waiting)
2706	>	waiter = null;
2707	>	return;
2708	>	}
2709	>	}
2710	>	else if ((s | WAITER) == 0) {
2711	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2712	>	waiting = true;
2713	>	waiter = Thread.currentThread();
2714	>	}
2715	>	}
2716	>	else if (waiting)
2717	>	LockSupport.park(this);
2718	>	}
2719	>	}
2720
2721	<	/**
2722	<	* If the value for the specified key is present and non-null,
2723	<	* attempts to compute a new mapping given the key and its current
2724	<	* mapped value.  The entire method invocation is performed
2725	<	* atomically.  Some attempted update operations on this map by
2726	<	* other threads may be blocked while computation is in progress,
2727	<	* so the computation should be short and simple, and must not
2728	<	* attempt to update any other mappings of this Map.
2729	<	*
2730	<	* @param key key with which the specified value is to be associated
2731	<	* @param remappingFunction the function to compute a value
2732	<	* @return the new value associated with the specified key, or null if none
2733	<	* @throws NullPointerException if the specified key or remappingFunction
2734	<	*         is null
2735	<	* @throws IllegalStateException if the computation detectably
2736	<	*         attempts a recursive update to this map that would
2737	<	*         otherwise never complete
2738	<	* @throws RuntimeException or Error if the remappingFunction does so,
2739	<	*         in which case the mapping is unchanged
2740	<	*/
2741	<	public V computeIfPresent
2742	<	(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
2743	<	return internalCompute(key, true, remappingFunction);
2744	<	}
2721	>	/**
2722	>	* Returns matching node or null if none. Tries to search
2723	>	* using tree compareisons from root, but continues linear
2724	>	* search when lock not available.
2725	>	*/
2726	>	final Node<K,V> find(int h, Object k) {
2727	>	if (k != null) {
2728	>	for (Node<K,V> e = first; e != null; e = e.next) {
2729	>	int s; K ek;
2730	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2731	>	if (e.hash == h &&
2732	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2733	>	return e;
2734	>	}
2735	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2736	>	s + READER)) {
2737	>	TreeNode<K,V> r, p;
2738	>	try {
2739	>	p = ((r = root) == null ? null :
2740	>	r.findTreeNode(h, k, null));
2741	>	} finally {
2742	>	Thread w;
2743	>	if (U.getAndAddInt(this, LOCKSTATE, -READER) ==
2744	>	(READER|WAITER) && (w = waiter) != null)
2745	>	LockSupport.unpark(w);
2746	>	}
2747	>	return p;
2748	>	}
2749	>	}
2750	>	}
2751	>	return null;
2752	>	}
2753
2754	<	/**
2755	<	* Attempts to compute a mapping for the specified key and its
2756	<	* current mapped value (or {@code null} if there is no current
2757	<	* mapping). The entire method invocation is performed atomically.
2758	<	* Some attempted update operations on this map by other threads
2759	<	* may be blocked while computation is in progress, so the
2760	<	* computation should be short and simple, and must not attempt to
2761	<	* update any other mappings of this Map.
2762	<	*
2763	<	* @param key key with which the specified value is to be associated
2764	<	* @param remappingFunction the function to compute a value
2765	<	* @return the new value associated with the specified key, or null if none
2766	<	* @throws NullPointerException if the specified key or remappingFunction
2767	<	*         is null
2768	<	* @throws IllegalStateException if the computation detectably
2769	<	*         attempts a recursive update to this map that would
2770	<	*         otherwise never complete
2771	<	* @throws RuntimeException or Error if the remappingFunction does so,
2772	<	*         in which case the mapping is unchanged
2773	<	*/
2774	<	public V compute
2775	<	(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
2776	<	return internalCompute(key, false, remappingFunction);
2777	<	}
2754	>	/**
2755	>	* Finds or adds a node.
2756	>	* @return null if added
2757	>	*/
2758	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2759	>	Class<?> kc = null;
2760	>	for (TreeNode<K,V> p = root;;) {
2761	>	int dir, ph; K pk; TreeNode<K,V> q, pr;
2762	>	if (p == null) {
2763	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2764	>	break;
2765	>	}
2766	>	else if ((ph = p.hash) > h)
2767	>	dir = -1;
2768	>	else if (ph < h)
2769	>	dir = 1;
2770	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2771	>	return p;
2772	>	else if ((kc == null &&
2773	>	(kc = comparableClassFor(k)) == null) ||
2774	>	(dir = compareComparables(kc, k, pk)) == 0) {
2775	>	if (p.left == null)
2776	>	dir = 1;
2777	>	else if ((pr = p.right) == null ||
2778	>	(q = pr.findTreeNode(h, k, kc)) == null)
2779	>	dir = -1;
2780	>	else
2781	>	return q;
2782	>	}
2783	>	TreeNode<K,V> xp = p;
2784	>	if ((p = (dir < 0) ? p.left : p.right) == null) {
2785	>	TreeNode<K,V> x, f = first;
2786	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2787	>	if (f != null)
2788	>	f.prev = x;
2789	>	if (dir < 0)
2790	>	xp.left = x;
2791	>	else
2792	>	xp.right = x;
2793	>	if (!xp.red)
2794	>	x.red = true;
2795	>	else {
2796	>	lockRoot();
2797	>	try {
2798	>	root = balanceInsertion(root, x);
2799	>	} finally {
2800	>	unlockRoot();
2801	>	}
2802	>	}
2803	>	break;
2804	>	}
2805	>	}
2806	>	assert checkInvariants(root);
2807	>	return null;
2808	>	}
2809
2810	<	/**
2811	<	* If the specified key is not already associated with a
2812	<	* (non-null) value, associates it with the given value.
2813	<	* Otherwise, replaces the value with the results of the given
2814	<	* remapping function, or removes if {@code null}. The entire
2815	<	* method invocation is performed atomically.  Some attempted
2816	<	* update operations on this map by other threads may be blocked
2817	<	* while computation is in progress, so the computation should be
2818	<	* short and simple, and must not attempt to update any other
2819	<	* mappings of this Map.
2820	<	*
2821	<	* @param key key with which the specified value is to be associated
2822	<	* @param value the value to use if absent
2823	<	* @param remappingFunction the function to recompute a value if present
2824	<	* @return the new value associated with the specified key, or null if none
2825	<	* @throws NullPointerException if the specified key or the
2826	<	*         remappingFunction is null
2827	<	* @throws RuntimeException or Error if the remappingFunction does so,
2828	<	*         in which case the mapping is unchanged
2829	<	*/
2830	<	public V merge
2831	<	(K key, V value,
2832	<	BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
2833	<	return internalMerge(key, value, remappingFunction);
2834	<	}
2810	>	/**
2811	>	* Removes the given node, that must be present before this
2812	>	* call.  This is messier than typical red-black deletion code
2813	>	* because we cannot swap the contents of an interior node
2814	>	* with a leaf successor that is pinned by "next" pointers
2815	>	* that are accessible independently of lock. So instead we
2816	>	* swap the tree linkages.
2817	>	*
2818	>	* @return true if now too small so should be untreeified.
2819	>	*/
2820	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2821	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2822	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2823	>	TreeNode<K,V> r, rl;
2824	>	if (pred == null)
2825	>	first = next;
2826	>	else
2827	>	pred.next = next;
2828	>	if (next != null)
2829	>	next.prev = pred;
2830	>	if (first == null) {
2831	>	root = null;
2832	>	return true;
2833	>	}
2834	>	if ((r = root) == null || r.right == null || // too small
2835	>	(rl = r.left) == null || rl.left == null)
2836	>	return true;
2837	>	lockRoot();
2838	>	try {
2839	>	TreeNode<K,V> replacement;
2840	>	TreeNode<K,V> pl = p.left;
2841	>	TreeNode<K,V> pr = p.right;
2842	>	if (pl != null && pr != null) {
2843	>	TreeNode<K,V> s = pr, sl;
2844	>	while ((sl = s.left) != null) // find successor
2845	>	s = sl;
2846	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2847	>	TreeNode<K,V> sr = s.right;
2848	>	TreeNode<K,V> pp = p.parent;
2849	>	if (s == pr) { // p was s's direct parent
2850	>	p.parent = s;
2851	>	s.right = p;
2852	>	}
2853	>	else {
2854	>	TreeNode<K,V> sp = s.parent;
2855	>	if ((p.parent = sp) != null) {
2856	>	if (s == sp.left)
2857	>	sp.left = p;
2858	>	else
2859	>	sp.right = p;
2860	>	}
2861	>	if ((s.right = pr) != null)
2862	>	pr.parent = s;
2863	>	}
2864	>	p.left = null;
2865	>	if ((p.right = sr) != null)
2866	>	sr.parent = p;
2867	>	if ((s.left = pl) != null)
2868	>	pl.parent = s;
2869	>	if ((s.parent = pp) == null)
2870	>	r = s;
2871	>	else if (p == pp.left)
2872	>	pp.left = s;
2873	>	else
2874	>	pp.right = s;
2875	>	if (sr != null)
2876	>	replacement = sr;
2877	>	else
2878	>	replacement = p;
2879	>	}
2880	>	else if (pl != null)
2881	>	replacement = pl;
2882	>	else if (pr != null)
2883	>	replacement = pr;
2884	>	else
2885	>	replacement = p;
2886	>	if (replacement != p) {
2887	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2888	>	if (pp == null)
2889	>	r = replacement;
2890	>	else if (p == pp.left)
2891	>	pp.left = replacement;
2892	>	else
2893	>	pp.right = replacement;
2894	>	p.left = p.right = p.parent = null;
2895	>	}
2896
2897	<	/**
2714	<	* Removes the key (and its corresponding value) from this map.
2715	<	* This method does nothing if the key is not in the map.
2716	<	*
2717	<	* @param  key the key that needs to be removed
2718	<	* @return the previous value associated with {@code key}, or
2719	<	*         {@code null} if there was no mapping for {@code key}
2720	<	* @throws NullPointerException if the specified key is null
2721	<	*/
2722	<	public V remove(Object key) {
2723	<	return internalReplace(key, null, null);
2724	<	}
2897	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2898
2899	<	/**
2900	<	* {@inheritDoc}
2901	<	*
2902	<	* @throws NullPointerException if the specified key is null
2903	<	*/
2904	<	public boolean remove(Object key, Object value) {
2905	<	if (key == null)
2906	<	throw new NullPointerException();
2907	<	return value != null && internalReplace(key, null, value) != null;
2908	<	}
2899	>	if (p == replacement) {  // detach pointers
2900	>	TreeNode<K,V> pp;
2901	>	if ((pp = p.parent) != null) {
2902	>	if (p == pp.left)
2903	>	pp.left = null;
2904	>	else if (p == pp.right)
2905	>	pp.right = null;
2906	>	p.parent = null;
2907	>	}
2908	>	}
2909	>	} finally {
2910	>	unlockRoot();
2911	>	}
2912	>	assert checkInvariants(root);
2913	>	return false;
2914	>	}
2915
2916	<	/**
2917	<	* {@inheritDoc}
2739	<	*
2740	<	* @throws NullPointerException if any of the arguments are null
2741	<	*/
2742	<	public boolean replace(K key, V oldValue, V newValue) {
2743	<	if (key == null || oldValue == null || newValue == null)
2744	<	throw new NullPointerException();
2745	<	return internalReplace(key, newValue, oldValue) != null;
2746	<	}
2916	>	/* ------------------------------------------------------------ */
2917	>	// Red-black tree methods, all adapted from CLR
2918
2919	<	/**
2920	<	* {@inheritDoc}
2921	<	*
2922	<	* @return the previous value associated with the specified key,
2923	<	*         or {@code null} if there was no mapping for the key
2924	<	* @throws NullPointerException if the specified key or value is null
2925	<	*/
2926	<	public V replace(K key, V value) {
2927	<	if (key == null || value == null)
2928	<	throw new NullPointerException();
2929	<	return internalReplace(key, value, null);
2930	<	}
2919	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2920	>	TreeNode<K,V> p) {
2921	>	TreeNode<K,V> r, pp, rl;
2922	>	if (p != null && (r = p.right) != null) {
2923	>	if ((rl = p.right = r.left) != null)
2924	>	rl.parent = p;
2925	>	if ((pp = r.parent = p.parent) == null)
2926	>	(root = r).red = false;
2927	>	else if (pp.left == p)
2928	>	pp.left = r;
2929	>	else
2930	>	pp.right = r;
2931	>	r.left = p;
2932	>	p.parent = r;
2933	>	}
2934	>	return root;
2935	>	}
2936
2937	<	/**
2938	<	* Removes all of the mappings from this map.
2939	<	*/
2940	<	public void clear() {
2941	<	internalClear();
2942	<	}
2937	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2938	>	TreeNode<K,V> p) {
2939	>	TreeNode<K,V> l, pp, lr;
2940	>	if (p != null && (l = p.left) != null) {
2941	>	if ((lr = p.left = l.right) != null)
2942	>	lr.parent = p;
2943	>	if ((pp = l.parent = p.parent) == null)
2944	>	(root = l).red = false;
2945	>	else if (pp.right == p)
2946	>	pp.right = l;
2947	>	else
2948	>	pp.left = l;
2949	>	l.right = p;
2950	>	p.parent = l;
2951	>	}
2952	>	return root;
2953	>	}
2954
2955	<	/**
2956	<	* Returns a {@link Set} view of the keys contained in this map.
2957	<	* The set is backed by the map, so changes to the map are
2958	<	* reflected in the set, and vice-versa.
2959	<	*
2960	<	* @return the set view
2961	<	*/
2962	<	public KeySetView<K,V> keySet() {
2963	<	KeySetView<K,V> ks = keySet;
2964	<	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2965	<	}
2955	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2956	>	TreeNode<K,V> x) {
2957	>	x.red = true;
2958	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2959	>	if ((xp = x.parent) == null) {
2960	>	x.red = false;
2961	>	return x;
2962	>	}
2963	>	else if (!xp.red || (xpp = xp.parent) == null)
2964	>	return root;
2965	>	if (xp == (xppl = xpp.left)) {
2966	>	if ((xppr = xpp.right) != null && xppr.red) {
2967	>	xppr.red = false;
2968	>	xp.red = false;
2969	>	xpp.red = true;
2970	>	x = xpp;
2971	>	}
2972	>	else {
2973	>	if (x == xp.right) {
2974	>	root = rotateLeft(root, x = xp);
2975	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2976	>	}
2977	>	if (xp != null) {
2978	>	xp.red = false;
2979	>	if (xpp != null) {
2980	>	xpp.red = true;
2981	>	root = rotateRight(root, xpp);
2982	>	}
2983	>	}
2984	>	}
2985	>	}
2986	>	else {
2987	>	if (xppl != null && xppl.red) {
2988	>	xppl.red = false;
2989	>	xp.red = false;
2990	>	xpp.red = true;
2991	>	x = xpp;
2992	>	}
2993	>	else {
2994	>	if (x == xp.left) {
2995	>	root = rotateRight(root, x = xp);
2996	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2997	>	}
2998	>	if (xp != null) {
2999	>	xp.red = false;
3000	>	if (xpp != null) {
3001	>	xpp.red = true;
3002	>	root = rotateLeft(root, xpp);
3003	>	}
3004	>	}
3005	>	}
3006	>	}
3007	>	}
3008	>	}
3009
3010	<	/**
3011	<	* Returns a {@link Set} view of the keys in this map, using the
3012	<	* given common mapped value for any additions (i.e., {@link
3013	<	* Collection#add} and {@link Collection#addAll}). This is of
3014	<	* course only appropriate if it is acceptable to use the same
3015	<	* value for all additions from this view.
3016	<	*
3017	<	* @param mappedValue the mapped value to use for any additions
3018	<	* @return the set view
3019	<	* @throws NullPointerException if the mappedValue is null
3020	<	*/
3021	<	public KeySetView<K,V> keySet(V mappedValue) {
3022	<	if (mappedValue == null)
3023	<	throw new NullPointerException();
3024	<	return new KeySetView<K,V>(this, mappedValue);
3025	<	}
3010	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
3011	>	TreeNode<K,V> x) {
3012	>	for (TreeNode<K,V> xp, xpl, xpr;;)  {
3013	>	if (x == null || x == root)
3014	>	return root;
3015	>	else if ((xp = x.parent) == null) {
3016	>	x.red = false;
3017	>	return x;
3018	>	}
3019	>	else if (x.red) {
3020	>	x.red = false;
3021	>	return root;
3022	>	}
3023	>	else if ((xpl = xp.left) == x) {
3024	>	if ((xpr = xp.right) != null && xpr.red) {
3025	>	xpr.red = false;
3026	>	xp.red = true;
3027	>	root = rotateLeft(root, xp);
3028	>	xpr = (xp = x.parent) == null ? null : xp.right;
3029	>	}
3030	>	if (xpr == null)
3031	>	x = xp;
3032	>	else {
3033	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
3034	>	if ((sr == null || !sr.red) &&
3035	>	(sl == null || !sl.red)) {
3036	>	xpr.red = true;
3037	>	x = xp;
3038	>	}
3039	>	else {
3040	>	if (sr == null || !sr.red) {
3041	>	if (sl != null)
3042	>	sl.red = false;
3043	>	xpr.red = true;
3044	>	root = rotateRight(root, xpr);
3045	>	xpr = (xp = x.parent) == null ?
3046	>	null : xp.right;
3047	>	}
3048	>	if (xpr != null) {
3049	>	xpr.red = (xp == null) ? false : xp.red;
3050	>	if ((sr = xpr.right) != null)
3051	>	sr.red = false;
3052	>	}
3053	>	if (xp != null) {
3054	>	xp.red = false;
3055	>	root = rotateLeft(root, xp);
3056	>	}
3057	>	x = root;
3058	>	}
3059	>	}
3060	>	}
3061	>	else { // symmetric
3062	>	if (xpl != null && xpl.red) {
3063	>	xpl.red = false;
3064	>	xp.red = true;
3065	>	root = rotateRight(root, xp);
3066	>	xpl = (xp = x.parent) == null ? null : xp.left;
3067	>	}
3068	>	if (xpl == null)
3069	>	x = xp;
3070	>	else {
3071	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3072	>	if ((sl == null || !sl.red) &&
3073	>	(sr == null || !sr.red)) {
3074	>	xpl.red = true;
3075	>	x = xp;
3076	>	}
3077	>	else {
3078	>	if (sl == null || !sl.red) {
3079	>	if (sr != null)
3080	>	sr.red = false;
3081	>	xpl.red = true;
3082	>	root = rotateLeft(root, xpl);
3083	>	xpl = (xp = x.parent) == null ?
3084	>	null : xp.left;
3085	>	}
3086	>	if (xpl != null) {
3087	>	xpl.red = (xp == null) ? false : xp.red;
3088	>	if ((sl = xpl.left) != null)
3089	>	sl.red = false;
3090	>	}
3091	>	if (xp != null) {
3092	>	xp.red = false;
3093	>	root = rotateRight(root, xp);
3094	>	}
3095	>	x = root;
3096	>	}
3097	>	}
3098	>	}
3099	>	}
3100	>	}
3101
3102	<	/**
3103	<	* Returns a {@link Collection} view of the values contained in this map.
3104	<	* The collection is backed by the map, so changes to the map are
3105	<	* reflected in the collection, and vice-versa.
3106	<	*/
3107	<	public ValuesView<K,V> values() {
3108	<	ValuesView<K,V> vs = values;
3109	<	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
3110	<	}
3102	>	/**
3103	>	* Recursive invariant check
3104	>	*/
3105	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3106	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3107	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3108	>	if (tb != null && tb.next != t)
3109	>	return false;
3110	>	if (tn != null && tn.prev != t)
3111	>	return false;
3112	>	if (tp != null && t != tp.left && t != tp.right)
3113	>	return false;
3114	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3115	>	return false;
3116	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3117	>	return false;
3118	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3119	>	return false;
3120	>	if (tl != null && !checkInvariants(tl))
3121	>	return false;
3122	>	if (tr != null && !checkInvariants(tr))
3123	>	return false;
3124	>	return true;
3125	>	}
3126
3127	<	/**
3128	<	* Returns a {@link Set} view of the mappings contained in this map.
3129	<	* The set is backed by the map, so changes to the map are
3130	<	* reflected in the set, and vice-versa.  The set supports element
3131	<	* removal, which removes the corresponding mapping from the map,
3132	<	* via the {@code Iterator.remove}, {@code Set.remove},
3133	<	* {@code removeAll}, {@code retainAll}, and {@code clear}
3134	<	* operations.  It does not support the {@code add} or
3135	<	* {@code addAll} operations.
3136	<	*
3137	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
3138	<	* that will never throw {@link ConcurrentModificationException},
2819	<	* and guarantees to traverse elements as they existed upon
2820	<	* construction of the iterator, and may (but is not guaranteed to)
2821	<	* reflect any modifications subsequent to construction.
2822	<	*/
2823	<	public Set<Map.Entry<K,V>> entrySet() {
2824	<	EntrySetView<K,V> es = entrySet;
2825	<	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
3127	>	private static final sun.misc.Unsafe U;
3128	>	private static final long LOCKSTATE;
3129	>	static {
3130	>	try {
3131	>	U = sun.misc.Unsafe.getUnsafe();
3132	>	Class<?> k = TreeBin.class;
3133	>	LOCKSTATE = U.objectFieldOffset
3134	>	(k.getDeclaredField("lockState"));
3135	>	} catch (Exception e) {
3136	>	throw new Error(e);
3137	>	}
3138	>	}
3139		}
3140
3141	<	/**
2829	<	* Returns an enumeration of the keys in this table.
2830	<	*
2831	<	* @return an enumeration of the keys in this table
2832	<	* @see #keySet()
2833	<	*/
2834	<	public Enumeration<K> keys() {
2835	<	return new KeyIterator<K,V>(this);
2836	<	}
3141	>	/* ----------------Table Traversal -------------- */
3142
3143		/**
3144	<	* Returns an enumeration of the values in this table.
3144	>	* Encapsulates traversal for methods such as containsValue; also
3145	>	* serves as a base class for other iterators and spliterators.
3146		*
3147	<	* @return an enumeration of the values in this table
3148	<	* @see #values()
3149	<	*/
3150	<	public Enumeration<V> elements() {
3151	<	return new ValueIterator<K,V>(this);
3152	<	}
3153	<
3154	<	/**
2849	<	* Returns the hash code value for this {@link Map}, i.e.,
2850	<	* the sum of, for each key-value pair in the map,
2851	<	* {@code key.hashCode() ^ value.hashCode()}.
3147	>	* Method advance visits once each still-valid node that was
3148	>	* reachable upon iterator construction. It might miss some that
3149	>	* were added to a bin after the bin was visited, which is OK wrt
3150	>	* consistency guarantees. Maintaining this property in the face
3151	>	* of possible ongoing resizes requires a fair amount of
3152	>	* bookkeeping state that is difficult to optimize away amidst
3153	>	* volatile accesses.  Even so, traversal maintains reasonable
3154	>	* throughput.
3155		*
3156	<	* @return the hash code value for this map
3156	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3157	>	* However, if the table has been resized, then all future steps
3158	>	* must traverse both the bin at the current index as well as at
3159	>	* (index + baseSize); and so on for further resizings. To
3160	>	* paranoically cope with potential sharing by users of iterators
3161	>	* across threads, iteration terminates if a bounds checks fails
3162	>	* for a table read.
3163		*/
3164	<	public int hashCode() {
3165	<	int h = 0;
3166	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3167	<	V v;
3168	<	while ((v = it.advance()) != null) {
3169	<	h += it.nextKey.hashCode() ^ v.hashCode();
3164	>	static class Traverser<K,V> {
3165	>	Node<K,V>[] tab;        // current table; updated if resized
3166	>	Node<K,V> next;         // the next entry to use
3167	>	int index;              // index of bin to use next
3168	>	int baseIndex;          // current index of initial table
3169	>	int baseLimit;          // index bound for initial table
3170	>	final int baseSize;     // initial table size
3171	>
3172	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3173	>	this.tab = tab;
3174	>	this.baseSize = size;
3175	>	this.baseIndex = this.index = index;
3176	>	this.baseLimit = limit;
3177	>	this.next = null;
3178		}
2862	–	return h;
2863	–	}
3179
3180	<	/**
3181	<	* Returns a string representation of this map.  The string
3182	<	* representation consists of a list of key-value mappings (in no
3183	<	* particular order) enclosed in braces ("{@code {}}").  Adjacent
3184	<	* mappings are separated by the characters {@code ", "} (comma
3185	<	* and space).  Each key-value mapping is rendered as the key
3186	<	* followed by an equals sign ("{@code =}") followed by the
2872	<	* associated value.
2873	<	*
2874	<	* @return a string representation of this map
2875	<	*/
2876	<	public String toString() {
2877	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2878	<	StringBuilder sb = new StringBuilder();
2879	<	sb.append('{');
2880	<	V v;
2881	<	if ((v = it.advance()) != null) {
3180	>	/**
3181	>	* Advances if possible, returning next valid node, or null if none.
3182	>	*/
3183	>	final Node<K,V> advance() {
3184	>	Node<K,V> e;
3185	>	if ((e = next) != null)
3186	>	e = e.next;
3187		for (;;) {
3188	<	K k = it.nextKey;
3189	<	sb.append(k == this ? "(this Map)" : k);
3190	<	sb.append('=');
3191	<	sb.append(v == this ? "(this Map)" : v);
3192	<	if ((v = it.advance()) == null)
3193	<	break;
3194	<	sb.append(',').append(' ');
3188	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
3189	>	if (e != null)
3190	>	return next = e;
3191	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3192	>	(n = t.length) <= (i = index) || i < 0)
3193	>	return next = null;
3194	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
3195	>	if (e instanceof ForwardingNode) {
3196	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3197	>	e = null;
3198	>	continue;
3199	>	}
3200	>	else if (e instanceof TreeBin)
3201	>	e = ((TreeBin<K,V>)e).first;
3202	>	else
3203	>	e = null;
3204	>	}
3205	>	if ((index += baseSize) >= n)
3206	>	index = ++baseIndex;    // visit upper slots if present
3207		}
3208		}
2892	–	return sb.append('}').toString();
3209		}
3210
3211		/**
3212	<	* Compares the specified object with this map for equality.
3213	<	* Returns {@code true} if the given object is a map with the same
2898	<	* mappings as this map.  This operation may return misleading
2899	<	* results if either map is concurrently modified during execution
2900	<	* of this method.
2901	<	*
2902	<	* @param o object to be compared for equality with this map
2903	<	* @return {@code true} if the specified object is equal to this map
3212	>	* Base of key, value, and entry Iterators. Adds fields to
3213	>	* Traverser to support iterator.remove
3214		*/
3215	<	public boolean equals(Object o) {
3216	<	if (o != this) {
3217	<	if (!(o instanceof Map))
3218	<	return false;
3219	<	Map<?,?> m = (Map<?,?>) o;
3220	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3221	<	V val;
3222	<	while ((val = it.advance()) != null) {
2913	<	Object v = m.get(it.nextKey);
2914	<	if (v == null || (v != val && !v.equals(val)))
2915	<	return false;
2916	<	}
2917	<	for (Map.Entry<?,?> e : m.entrySet()) {
2918	<	Object mk, mv, v;
2919	<	if ((mk = e.getKey()) == null ||
2920	<	(mv = e.getValue()) == null ||
2921	<	(v = internalGet(mk)) == null ||
2922	<	(mv != v && !mv.equals(v)))
2923	<	return false;
2924	<	}
3215	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3216	>	final ConcurrentHashMap<K,V> map;
3217	>	Node<K,V> lastReturned;
3218	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3219	>	ConcurrentHashMap<K,V> map) {
3220	>	super(tab, size, index, limit);
3221	>	this.map = map;
3222	>	advance();
3223		}
2926	–	return true;
2927	–	}
3224
3225	<	/* ----------------Iterators -------------- */
3225	>	public final boolean hasNext() { return next != null; }
3226	>	public final boolean hasMoreElements() { return next != null; }
3227
3228	<	@SuppressWarnings("serial") static final class KeyIterator<K,V>
3229	<	extends Traverser<K,V,Object>
3230	<	implements Spliterator<K>, Iterator<K>, Enumeration<K> {
3231	<	KeyIterator(ConcurrentHashMap<K, V> map) { super(map); }
3232	<	KeyIterator(ConcurrentHashMap<K, V> map, Traverser<K,V,Object> it) {
3233	<	super(map, it);
3234	<	}
3235	<	public KeyIterator<K,V> trySplit() {
3236	<	if (tab != null && baseIndex == baseLimit)
3237	<	return null;
3238	<	return new KeyIterator<K,V>(map, this);
3228	>	public final void remove() {
3229	>	Node<K,V> p;
3230	>	if ((p = lastReturned) == null)
3231	>	throw new IllegalStateException();
3232	>	lastReturned = null;
3233	>	map.replaceNode(p.key, null, null);
3234	>	}
3235	>	}
3236	>
3237	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3238	>	implements Iterator<K>, Enumeration<K> {
3239	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3240	>	ConcurrentHashMap<K,V> map) {
3241	>	super(tab, index, size, limit, map);
3242		}
3243	+
3244		public final K next() {
3245	<	if (nextVal == null && advance() == null)
3245	>	Node<K,V> p;
3246	>	if ((p = next) == null)
3247		throw new NoSuchElementException();
3248	<	K k = nextKey;
3249	<	nextVal = null;
3248	>	K k = p.key;
3249	>	lastReturned = p;
3250	>	advance();
3251		return k;
3252		}
3253
3254		public final K nextElement() { return next(); }
2952	–
2953	–	public Iterator<K> iterator() { return this; }
2954	–
2955	–	public void forEach(Consumer<? super K> action) {
2956	–	if (action == null) throw new NullPointerException();
2957	–	while (advance() != null)
2958	–	action.accept(nextKey);
2959	–	}
2960	–
2961	–	public boolean tryAdvance(Consumer<? super K> block) {
2962	–	if (block == null) throw new NullPointerException();
2963	–	if (advance() == null)
2964	–	return false;
2965	–	block.accept(nextKey);
2966	–	return true;
2967	–	}
3255		}
3256
3257	<	@SuppressWarnings("serial") static final class ValueIterator<K,V>
3258	<	extends Traverser<K,V,Object>
3259	<	implements Spliterator<V>, Iterator<V>, Enumeration<V> {
3260	<	ValueIterator(ConcurrentHashMap<K, V> map) { super(map); }
3261	<	ValueIterator(ConcurrentHashMap<K, V> map, Traverser<K,V,Object> it) {
2975	<	super(map, it);
2976	<	}
2977	<	public ValueIterator<K,V> trySplit() {
2978	<	if (tab != null && baseIndex == baseLimit)
2979	<	return null;
2980	<	return new ValueIterator<K,V>(map, this);
3257	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3258	>	implements Iterator<V>, Enumeration<V> {
3259	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3260	>	ConcurrentHashMap<K,V> map) {
3261	>	super(tab, index, size, limit, map);
3262		}
3263
3264		public final V next() {
3265	<	V v;
3266	<	if ((v = nextVal) == null && (v = advance()) == null)
3265	>	Node<K,V> p;
3266	>	if ((p = next) == null)
3267		throw new NoSuchElementException();
3268	<	nextVal = null;
3268	>	V v = p.val;
3269	>	lastReturned = p;
3270	>	advance();
3271		return v;
3272		}
3273
3274		public final V nextElement() { return next(); }
2992	–
2993	–	public Iterator<V> iterator() { return this; }
2994	–
2995	–	public void forEach(Consumer<? super V> action) {
2996	–	if (action == null) throw new NullPointerException();
2997	–	V v;
2998	–	while ((v = advance()) != null)
2999	–	action.accept(v);
3000	–	}
3001	–
3002	–	public boolean tryAdvance(Consumer<? super V> block) {
3003	–	V v;
3004	–	if (block == null) throw new NullPointerException();
3005	–	if ((v = advance()) == null)
3006	–	return false;
3007	–	block.accept(v);
3008	–	return true;
3009	–	}
3010	–
3275		}
3276
3277	<	@SuppressWarnings("serial") static final class EntryIterator<K,V>
3278	<	extends Traverser<K,V,Object>
3279	<	implements Spliterator<Map.Entry<K,V>>, Iterator<Map.Entry<K,V>> {
3280	<	EntryIterator(ConcurrentHashMap<K, V> map) { super(map); }
3281	<	EntryIterator(ConcurrentHashMap<K, V> map, Traverser<K,V,Object> it) {
3018	<	super(map, it);
3019	<	}
3020	<	public EntryIterator<K,V> trySplit() {
3021	<	if (tab != null && baseIndex == baseLimit)
3022	<	return null;
3023	<	return new EntryIterator<K,V>(map, this);
3277	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3278	>	implements Iterator<Map.Entry<K,V>> {
3279	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3280	>	ConcurrentHashMap<K,V> map) {
3281	>	super(tab, index, size, limit, map);
3282		}
3283
3284		public final Map.Entry<K,V> next() {
3285	<	V v;
3286	<	if ((v = nextVal) == null && (v = advance()) == null)
3285	>	Node<K,V> p;
3286	>	if ((p = next) == null)
3287		throw new NoSuchElementException();
3288	<	K k = nextKey;
3289	<	nextVal = null;
3288	>	K k = p.key;
3289	>	V v = p.val;
3290	>	lastReturned = p;
3291	>	advance();
3292		return new MapEntry<K,V>(k, v, map);
3293		}
3034	–
3035	–	public Iterator<Map.Entry<K,V>> iterator() { return this; }
3036	–
3037	–	public void forEach(Consumer<? super Map.Entry<K,V>> action) {
3038	–	if (action == null) throw new NullPointerException();
3039	–	V v;
3040	–	while ((v = advance()) != null)
3041	–	action.accept(entryFor(nextKey, v));
3042	–	}
3043	–
3044	–	public boolean tryAdvance(Consumer<? super Map.Entry<K,V>> block) {
3045	–	V v;
3046	–	if (block == null) throw new NullPointerException();
3047	–	if ((v = advance()) == null)
3048	–	return false;
3049	–	block.accept(entryFor(nextKey, v));
3050	–	return true;
3051	–	}
3052	–
3294		}
3295
3296		/**
3297	<	* Exported Entry for iterators
3297	>	* Exported Entry for EntryIterator
3298		*/
3299	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3299	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3300		final K key; // non-null
3301		V val;       // non-null
3302	<	final ConcurrentHashMap<K, V> map;
3303	<	MapEntry(K key, V val, ConcurrentHashMap<K, V> map) {
3302	>	final ConcurrentHashMap<K,V> map;
3303	>	MapEntry(K key, V val, ConcurrentHashMap<K,V> map) {
3304		this.key = key;
3305		this.val = val;
3306		this.map = map;
3307		}
3308	<	public final K getKey()       { return key; }
3309	<	public final V getValue()     { return val; }
3310	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3311	<	public final String toString(){ return key + "=" + val; }
3308	>	public K getKey()        { return key; }
3309	>	public V getValue()      { return val; }
3310	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3311	>	public String toString() { return key + "=" + val; }
3312
3313	<	public final boolean equals(Object o) {
3313	>	public boolean equals(Object o) {
3314		Object k, v; Map.Entry<?,?> e;
3315		return ((o instanceof Map.Entry) &&
3316		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3083 | Line 3324 | public class ConcurrentHashMap<K, V>
3324		* value to return is somewhat arbitrary here. Since we do not
3325		* necessarily track asynchronous changes, the most recent
3326		* "previous" value could be different from what we return (or
3327	<	* could even have been removed in which case the put will
3327	>	* could even have been removed, in which case the put will
3328		* re-establish). We do not and cannot guarantee more.
3329		*/
3330	<	public final V setValue(V value) {
3330	>	public V setValue(V value) {
3331		if (value == null) throw new NullPointerException();
3332		V v = val;
3333		val = value;
#	Line 3095 | Line 3336 | public class ConcurrentHashMap<K, V>
3336		}
3337		}
3338
3339	<	/**
3340	<	* Returns exportable snapshot entry for the given key and value
3341	<	* when write-through can't or shouldn't be used.
3342	<	*/
3343	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
3344	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
3345	<	}
3339	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3340	>	implements Spliterator<K> {
3341	>	long est;               // size estimate
3342	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3343	>	long est) {
3344	>	super(tab, size, index, limit);
3345	>	this.est = est;
3346	>	}
3347	>
3348	>	public Spliterator<K> trySplit() {
3349	>	int i, f, h;
3350	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3351	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3352	>	f, est >>>= 1);
3353	>	}
3354
3355	<	/* ---------------- Serialization Support -------------- */
3355	>	public void forEachRemaining(Consumer<? super K> action) {
3356	>	if (action == null) throw new NullPointerException();
3357	>	for (Node<K,V> p; (p = advance()) != null;)
3358	>	action.accept(p.key);
3359	>	}
3360
3361	<	/**
3362	<	* Stripped-down version of helper class used in previous version,
3363	<	* declared for the sake of serialization compatibility
3364	<	*/
3365	<	static class Segment<K,V> implements Serializable {
3366	<	private static final long serialVersionUID = 2249069246763182397L;
3367	<	final float loadFactor;
3368	<	Segment(float lf) { this.loadFactor = lf; }
3361	>	public boolean tryAdvance(Consumer<? super K> action) {
3362	>	if (action == null) throw new NullPointerException();
3363	>	Node<K,V> p;
3364	>	if ((p = advance()) == null)
3365	>	return false;
3366	>	action.accept(p.key);
3367	>	return true;
3368	>	}
3369	>
3370	>	public long estimateSize() { return est; }
3371	>
3372	>	public int characteristics() {
3373	>	return Spliterator.DISTINCT | Spliterator.CONCURRENT |
3374	>	Spliterator.NONNULL;
3375	>	}
3376		}
3377
3378	<	/**
3379	<	* Saves the state of the {@code ConcurrentHashMap} instance to a
3380	<	* stream (i.e., serializes it).
3381	<	* @param s the stream
3382	<	* @serialData
3383	<	* the key (Object) and value (Object)
3384	<	* for each key-value mapping, followed by a null pair.
3125	<	* The key-value mappings are emitted in no particular order.
3126	<	*/
3127	<	@SuppressWarnings("unchecked") private void writeObject
3128	<	(java.io.ObjectOutputStream s)
3129	<	throws java.io.IOException {
3130	<	if (segments == null) { // for serialization compatibility
3131	<	segments = (Segment<K,V>[])
3132	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
3133	<	for (int i = 0; i < segments.length; ++i)
3134	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
3378	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3379	>	implements Spliterator<V> {
3380	>	long est;               // size estimate
3381	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3382	>	long est) {
3383	>	super(tab, size, index, limit);
3384	>	this.est = est;
3385		}
3386	<	s.defaultWriteObject();
3387	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3388	<	V v;
3389	<	while ((v = it.advance()) != null) {
3390	<	s.writeObject(it.nextKey);
3391	<	s.writeObject(v);
3386	>
3387	>	public Spliterator<V> trySplit() {
3388	>	int i, f, h;
3389	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3390	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3391	>	f, est >>>= 1);
3392	>	}
3393	>
3394	>	public void forEachRemaining(Consumer<? super V> action) {
3395	>	if (action == null) throw new NullPointerException();
3396	>	for (Node<K,V> p; (p = advance()) != null;)
3397	>	action.accept(p.val);
3398	>	}
3399	>
3400	>	public boolean tryAdvance(Consumer<? super V> action) {
3401	>	if (action == null) throw new NullPointerException();
3402	>	Node<K,V> p;
3403	>	if ((p = advance()) == null)
3404	>	return false;
3405	>	action.accept(p.val);
3406	>	return true;
3407	>	}
3408	>
3409	>	public long estimateSize() { return est; }
3410	>
3411	>	public int characteristics() {
3412	>	return Spliterator.CONCURRENT | Spliterator.NONNULL;
3413		}
3143	–	s.writeObject(null);
3144	–	s.writeObject(null);
3145	–	segments = null; // throw away
3414		}
3415
3416	<	/**
3417	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3418	<	* @param s the stream
3419	<	*/
3420	<	@SuppressWarnings("unchecked") private void readObject
3421	<	(java.io.ObjectInputStream s)
3422	<	throws java.io.IOException, ClassNotFoundException {
3423	<	s.defaultReadObject();
3424	<	this.segments = null; // unneeded
3416	>	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3417	>	implements Spliterator<Map.Entry<K,V>> {
3418	>	final ConcurrentHashMap<K,V> map; // To export MapEntry
3419	>	long est;               // size estimate
3420	>	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3421	>	long est, ConcurrentHashMap<K,V> map) {
3422	>	super(tab, size, index, limit);
3423	>	this.map = map;
3424	>	this.est = est;
3425	>	}
3426
3427	<	// Create all nodes, then place in table once size is known
3428	<	long size = 0L;
3429	<	Node<V> p = null;
3430	<	for (;;) {
3431	<	K k = (K) s.readObject();
3163	<	V v = (V) s.readObject();
3164	<	if (k != null && v != null) {
3165	<	int h = spread(k.hashCode());
3166	<	p = new Node<V>(h, k, v, p);
3167	<	++size;
3168	<	}
3169	<	else
3170	<	break;
3427	>	public Spliterator<Map.Entry<K,V>> trySplit() {
3428	>	int i, f, h;
3429	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3430	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3431	>	f, est >>>= 1, map);
3432		}
3433	<	if (p != null) {
3434	<	boolean init = false;
3435	<	int n;
3436	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3437	<	n = MAXIMUM_CAPACITY;
3438	<	else {
3439	<	int sz = (int)size;
3440	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
3441	<	}
3442	<	int sc = sizeCtl;
3443	<	boolean collide = false;
3444	<	if (n > sc &&
3445	<	U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
3446	<	try {
3447	<	if (table == null) {
3448	<	init = true;
3449	<	@SuppressWarnings("rawtypes") Node[] rt = new Node[n];
3450	<	Node<V>[] tab = (Node<V>[])rt;
3451	<	int mask = n - 1;
3452	<	while (p != null) {
3453	<	int j = p.hash & mask;
3193	<	Node<V> next = p.next;
3194	<	Node<V> q = p.next = tabAt(tab, j);
3195	<	setTabAt(tab, j, p);
3196	<	if (!collide && q != null && q.hash == p.hash)
3197	<	collide = true;
3198	<	p = next;
3199	<	}
3200	<	table = tab;
3201	<	addCount(size, -1);
3202	<	sc = n - (n >>> 2);
3203	<	}
3204	<	} finally {
3205	<	sizeCtl = sc;
3206	<	}
3207	<	if (collide) { // rescan and convert to TreeBins
3208	<	Node<V>[] tab = table;
3209	<	for (int i = 0; i < tab.length; ++i) {
3210	<	int c = 0;
3211	<	for (Node<V> e = tabAt(tab, i); e != null; e = e.next) {
3212	<	if (++c > TREE_THRESHOLD &&
3213	<	(e.key instanceof Comparable)) {
3214	<	replaceWithTreeBin(tab, i, e.key);
3215	<	break;
3216	<	}
3217	<	}
3218	<	}
3219	<	}
3220	<	}
3221	<	if (!init) { // Can only happen if unsafely published.
3222	<	while (p != null) {
3223	<	internalPut((K)p.key, p.val, false);
3224	<	p = p.next;
3225	<	}
3226	<	}
3433	>
3434	>	public void forEachRemaining(Consumer<? super Map.Entry<K,V>> action) {
3435	>	if (action == null) throw new NullPointerException();
3436	>	for (Node<K,V> p; (p = advance()) != null; )
3437	>	action.accept(new MapEntry<K,V>(p.key, p.val, map));
3438	>	}
3439	>
3440	>	public boolean tryAdvance(Consumer<? super Map.Entry<K,V>> action) {
3441	>	if (action == null) throw new NullPointerException();
3442	>	Node<K,V> p;
3443	>	if ((p = advance()) == null)
3444	>	return false;
3445	>	action.accept(new MapEntry<K,V>(p.key, p.val, map));
3446	>	return true;
3447	>	}
3448	>
3449	>	public long estimateSize() { return est; }
3450	>
3451	>	public int characteristics() {
3452	>	return Spliterator.DISTINCT | Spliterator.CONCURRENT |
3453	>	Spliterator.NONNULL;
3454		}
3455		}
3456
3457	<	// -------------------------------------------------------
3457	>	// Parallel bulk operations
3458
3459	<	// Sequential bulk operations
3459	>	/**
3460	>	* Computes initial batch value for bulk tasks. The returned value
3461	>	* is approximately exp2 of the number of times (minus one) to
3462	>	* split task by two before executing leaf action. This value is
3463	>	* faster to compute and more convenient to use as a guide to
3464	>	* splitting than is the depth, since it is used while dividing by
3465	>	* two anyway.
3466	>	*/
3467	>	final int batchFor(long b) {
3468	>	long n;
3469	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3470	>	return 0;
3471	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3472	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3473	>	}
3474
3475		/**
3476		* Performs the given action for each (key, value).
3477		*
3478	+	* @param parallelismThreshold the (estimated) number of elements
3479	+	* needed for this operation to be executed in parallel
3480		* @param action the action
3481	+	* @since 1.8
3482		*/
3483	<	public void forEachSequentially
3484	<	(BiConsumer<? super K, ? super V> action) {
3483	>	public void forEach(long parallelismThreshold,
3484	>	BiConsumer<? super K,? super V> action) {
3485		if (action == null) throw new NullPointerException();
3486	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3487	<	V v;
3488	<	while ((v = it.advance()) != null)
3245	<	action.accept(it.nextKey, v);
3486	>	new ForEachMappingTask<K,V>
3487	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3488	>	action).invoke();
3489		}
3490
3491		/**
3492		* Performs the given action for each non-null transformation
3493		* of each (key, value).
3494		*
3495	+	* @param parallelismThreshold the (estimated) number of elements
3496	+	* needed for this operation to be executed in parallel
3497		* @param transformer a function returning the transformation
3498		* for an element, or null if there is no transformation (in
3499		* which case the action is not applied)
3500		* @param action the action
3501	+	* @since 1.8
3502		*/
3503	<	public <U> void forEachSequentially
3504	<	(BiFunction<? super K, ? super V, ? extends U> transformer,
3505	<	Consumer<? super U> action) {
3503	>	public <U> void forEach(long parallelismThreshold,
3504	>	BiFunction<? super K, ? super V, ? extends U> transformer,
3505	>	Consumer<? super U> action) {
3506		if (transformer == null || action == null)
3507		throw new NullPointerException();
3508	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3509	<	V v; U u;
3510	<	while ((v = it.advance()) != null) {
3265	<	if ((u = transformer.apply(it.nextKey, v)) != null)
3266	<	action.accept(u);
3267	<	}
3508	>	new ForEachTransformedMappingTask<K,V,U>
3509	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3510	>	transformer, action).invoke();
3511		}
3512
3513		/**
3514		* Returns a non-null result from applying the given search
3515	<	* function on each (key, value), or null if none.
3515	>	* function on each (key, value), or null if none.  Upon
3516	>	* success, further element processing is suppressed and the
3517	>	* results of any other parallel invocations of the search
3518	>	* function are ignored.
3519		*
3520	+	* @param parallelismThreshold the (estimated) number of elements
3521	+	* needed for this operation to be executed in parallel
3522		* @param searchFunction a function returning a non-null
3523		* result on success, else null
3524		* @return a non-null result from applying the given search
3525		* function on each (key, value), or null if none
3526	+	* @since 1.8
3527		*/
3528	<	public <U> U searchSequentially
3529	<	(BiFunction<? super K, ? super V, ? extends U> searchFunction) {
3528	>	public <U> U search(long parallelismThreshold,
3529	>	BiFunction<? super K, ? super V, ? extends U> searchFunction) {
3530		if (searchFunction == null) throw new NullPointerException();
3531	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3532	<	V v; U u;
3533	<	while ((v = it.advance()) != null) {
3285	<	if ((u = searchFunction.apply(it.nextKey, v)) != null)
3286	<	return u;
3287	<	}
3288	<	return null;
3531	>	return new SearchMappingsTask<K,V,U>
3532	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3533	>	searchFunction, new AtomicReference<U>()).invoke();
3534		}
3535
3536		/**
#	Line 3293 | Line 3538 | public class ConcurrentHashMap<K, V>
3538		* of all (key, value) pairs using the given reducer to
3539		* combine values, or null if none.
3540		*
3541	+	* @param parallelismThreshold the (estimated) number of elements
3542	+	* needed for this operation to be executed in parallel
3543		* @param transformer a function returning the transformation
3544		* for an element, or null if there is no transformation (in
3545		* which case it is not combined)
3546		* @param reducer a commutative associative combining function
3547		* @return the result of accumulating the given transformation
3548		* of all (key, value) pairs
3549	+	* @since 1.8
3550		*/
3551	<	public <U> U reduceSequentially
3552	<	(BiFunction<? super K, ? super V, ? extends U> transformer,
3553	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
3551	>	public <U> U reduce(long parallelismThreshold,
3552	>	BiFunction<? super K, ? super V, ? extends U> transformer,
3553	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
3554		if (transformer == null || reducer == null)
3555		throw new NullPointerException();
3556	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3557	<	U r = null, u; V v;
3558	<	while ((v = it.advance()) != null) {
3311	<	if ((u = transformer.apply(it.nextKey, v)) != null)
3312	<	r = (r == null) ? u : reducer.apply(r, u);
3313	<	}
3314	<	return r;
3556	>	return new MapReduceMappingsTask<K,V,U>
3557	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3558	>	null, transformer, reducer).invoke();
3559		}
3560
3561		/**
#	Line 3319 | Line 3563 | public class ConcurrentHashMap<K, V>
3563		* of all (key, value) pairs using the given reducer to
3564		* combine values, and the given basis as an identity value.
3565		*
3566	+	* @param parallelismThreshold the (estimated) number of elements
3567	+	* needed for this operation to be executed in parallel
3568		* @param transformer a function returning the transformation
3569		* for an element
3570		* @param basis the identity (initial default value) for the reduction
3571		* @param reducer a commutative associative combining function
3572		* @return the result of accumulating the given transformation
3573		* of all (key, value) pairs
3574	+	* @since 1.8
3575		*/
3576	<	public double reduceToDoubleSequentially
3577	<	(ToDoubleBiFunction<? super K, ? super V> transformer,
3578	<	double basis,
3579	<	DoubleBinaryOperator reducer) {
3576	>	public double reduceToDoubleIn(long parallelismThreshold,
3577	>	ToDoubleBiFunction<? super K, ? super V> transformer,
3578	>	double basis,
3579	>	DoubleBinaryOperator reducer) {
3580		if (transformer == null || reducer == null)
3581		throw new NullPointerException();
3582	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3583	<	double r = basis; V v;
3584	<	while ((v = it.advance()) != null)
3338	<	r = reducer.applyAsDouble(r, transformer.applyAsDouble(it.nextKey, v));
3339	<	return r;
3582	>	return new MapReduceMappingsToDoubleTask<K,V>
3583	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3584	>	null, transformer, basis, reducer).invoke();
3585		}
3586
3587		/**
#	Line 3344 | Line 3589 | public class ConcurrentHashMap<K, V>
3589		* of all (key, value) pairs using the given reducer to
3590		* combine values, and the given basis as an identity value.
3591		*
3592	+	* @param parallelismThreshold the (estimated) number of elements
3593	+	* needed for this operation to be executed in parallel
3594		* @param transformer a function returning the transformation
3595		* for an element
3596		* @param basis the identity (initial default value) for the reduction
3597		* @param reducer a commutative associative combining function
3598		* @return the result of accumulating the given transformation
3599		* of all (key, value) pairs
3600	+	* @since 1.8
3601		*/
3602	<	public long reduceToLongSequentially
3603	<	(ToLongBiFunction<? super K, ? super V> transformer,
3604	<	long basis,
3605	<	LongBinaryOperator reducer) {
3602	>	public long reduceToLong(long parallelismThreshold,
3603	>	ToLongBiFunction<? super K, ? super V> transformer,
3604	>	long basis,
3605	>	LongBinaryOperator reducer) {
3606		if (transformer == null || reducer == null)
3607		throw new NullPointerException();
3608	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3609	<	long r = basis; V v;
3610	<	while ((v = it.advance()) != null)
3363	<	r = reducer.applyAsLong(r, transformer.applyAsLong(it.nextKey, v));
3364	<	return r;
3608	>	return new MapReduceMappingsToLongTask<K,V>
3609	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3610	>	null, transformer, basis, reducer).invoke();
3611		}
3612
3613		/**
#	Line 3369 | Line 3615 | public class ConcurrentHashMap<K, V>
3615		* of all (key, value) pairs using the given reducer to
3616		* combine values, and the given basis as an identity value.
3617		*
3618	+	* @param parallelismThreshold the (estimated) number of elements
3619	+	* needed for this operation to be executed in parallel
3620		* @param transformer a function returning the transformation
3621		* for an element
3622		* @param basis the identity (initial default value) for the reduction
3623		* @param reducer a commutative associative combining function
3624		* @return the result of accumulating the given transformation
3625		* of all (key, value) pairs
3626	+	* @since 1.8
3627		*/
3628	<	public int reduceToIntSequentially
3629	<	(ToIntBiFunction<? super K, ? super V> transformer,
3630	<	int basis,
3631	<	IntBinaryOperator reducer) {
3628	>	public int reduceToInt(long parallelismThreshold,
3629	>	ToIntBiFunction<? super K, ? super V> transformer,
3630	>	int basis,
3631	>	IntBinaryOperator reducer) {
3632		if (transformer == null || reducer == null)
3633		throw new NullPointerException();
3634	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3635	<	int r = basis; V v;
3636	<	while ((v = it.advance()) != null)
3388	<	r = reducer.applyAsInt(r, transformer.applyAsInt(it.nextKey, v));
3389	<	return r;
3634	>	return new MapReduceMappingsToIntTask<K,V>
3635	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3636	>	null, transformer, basis, reducer).invoke();
3637		}
3638
3639		/**
3640		* Performs the given action for each key.
3641		*
3642	+	* @param parallelismThreshold the (estimated) number of elements
3643	+	* needed for this operation to be executed in parallel
3644		* @param action the action
3645	+	* @since 1.8
3646		*/
3647	<	public void forEachKeySequentially
3648	<	(Consumer<? super K> action) {
3647	>	public void forEachKey(long parallelismThreshold,
3648	>	Consumer<? super K> action) {
3649		if (action == null) throw new NullPointerException();
3650	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3651	<	while (it.advance() != null)
3652	<	action.accept(it.nextKey);
3650	>	new ForEachKeyTask<K,V>
3651	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3652	>	action).invoke();
3653		}
3654
3655		/**
3656		* Performs the given action for each non-null transformation
3657		* of each key.
3658		*
3659	+	* @param parallelismThreshold the (estimated) number of elements
3660	+	* needed for this operation to be executed in parallel
3661		* @param transformer a function returning the transformation
3662		* for an element, or null if there is no transformation (in
3663		* which case the action is not applied)
3664		* @param action the action
3665	+	* @since 1.8
3666		*/
3667	<	public <U> void forEachKeySequentially
3668	<	(Function<? super K, ? extends U> transformer,
3669	<	Consumer<? super U> action) {
3667	>	public <U> void forEachKey(long parallelismThreshold,
3668	>	Function<? super K, ? extends U> transformer,
3669	>	Consumer<? super U> action) {
3670		if (transformer == null || action == null)
3671		throw new NullPointerException();
3672	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3673	<	U u;
3674	<	while (it.advance() != null) {
3422	<	if ((u = transformer.apply(it.nextKey)) != null)
3423	<	action.accept(u);
3424	<	}
3425	<	ForkJoinTasks.forEachKey
3426	<	(this, transformer, action).invoke();
3672	>	new ForEachTransformedKeyTask<K,V,U>
3673	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3674	>	transformer, action).invoke();
3675		}
3676
3677		/**
3678		* Returns a non-null result from applying the given search
3679	<	* function on each key, or null if none.
3679	>	* function on each key, or null if none. Upon success,
3680	>	* further element processing is suppressed and the results of
3681	>	* any other parallel invocations of the search function are
3682	>	* ignored.
3683		*
3684	+	* @param parallelismThreshold the (estimated) number of elements
3685	+	* needed for this operation to be executed in parallel
3686		* @param searchFunction a function returning a non-null
3687		* result on success, else null
3688		* @return a non-null result from applying the given search
3689		* function on each key, or null if none
3690	+	* @since 1.8
3691		*/
3692	<	public <U> U searchKeysSequentially
3693	<	(Function<? super K, ? extends U> searchFunction) {
3694	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3695	<	U u;
3696	<	while (it.advance() != null) {
3697	<	if ((u = searchFunction.apply(it.nextKey)) != null)
3444	<	return u;
3445	<	}
3446	<	return null;
3692	>	public <U> U searchKeys(long parallelismThreshold,
3693	>	Function<? super K, ? extends U> searchFunction) {
3694	>	if (searchFunction == null) throw new NullPointerException();
3695	>	return new SearchKeysTask<K,V,U>
3696	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3697	>	searchFunction, new AtomicReference<U>()).invoke();
3698		}
3699
3700		/**
3701		* Returns the result of accumulating all keys using the given
3702		* reducer to combine values, or null if none.
3703		*
3704	+	* @param parallelismThreshold the (estimated) number of elements
3705	+	* needed for this operation to be executed in parallel
3706		* @param reducer a commutative associative combining function
3707		* @return the result of accumulating all keys using the given
3708		* reducer to combine values, or null if none
3709	+	* @since 1.8
3710		*/
3711	<	public K reduceKeysSequentially
3712	<	(BiFunction<? super K, ? super K, ? extends K> reducer) {
3711	>	public K reduceKeys(long parallelismThreshold,
3712	>	BiFunction<? super K, ? super K, ? extends K> reducer) {
3713		if (reducer == null) throw new NullPointerException();
3714	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3715	<	K r = null;
3716	<	while (it.advance() != null) {
3463	<	K u = it.nextKey;
3464	<	r = (r == null) ? u : reducer.apply(r, u);
3465	<	}
3466	<	return r;
3714	>	return new ReduceKeysTask<K,V>
3715	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3716	>	null, reducer).invoke();
3717		}
3718
3719		/**
#	Line 3471 | Line 3721 | public class ConcurrentHashMap<K, V>
3721		* of all keys using the given reducer to combine values, or
3722		* null if none.
3723		*
3724	+	* @param parallelismThreshold the (estimated) number of elements
3725	+	* needed for this operation to be executed in parallel
3726		* @param transformer a function returning the transformation
3727		* for an element, or null if there is no transformation (in
3728		* which case it is not combined)
3729		* @param reducer a commutative associative combining function
3730		* @return the result of accumulating the given transformation
3731		* of all keys
3732	+	* @since 1.8
3733		*/
3734	<	public <U> U reduceKeysSequentially
3735	<	(Function<? super K, ? extends U> transformer,
3734	>	public <U> U reduceKeys(long parallelismThreshold,
3735	>	Function<? super K, ? extends U> transformer,
3736		BiFunction<? super U, ? super U, ? extends U> reducer) {
3737		if (transformer == null || reducer == null)
3738		throw new NullPointerException();
3739	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3740	<	U r = null, u;
3741	<	while (it.advance() != null) {
3489	<	if ((u = transformer.apply(it.nextKey)) != null)
3490	<	r = (r == null) ? u : reducer.apply(r, u);
3491	<	}
3492	<	return r;
3739	>	return new MapReduceKeysTask<K,V,U>
3740	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3741	>	null, transformer, reducer).invoke();
3742		}
3743
3744		/**
#	Line 3497 | Line 3746 | public class ConcurrentHashMap<K, V>
3746		* of all keys using the given reducer to combine values, and
3747		* the given basis as an identity value.
3748		*
3749	+	* @param parallelismThreshold the (estimated) number of elements
3750	+	* needed for this operation to be executed in parallel
3751		* @param transformer a function returning the transformation
3752		* for an element
3753		* @param basis the identity (initial default value) for the reduction
3754		* @param reducer a commutative associative combining function
3755		* @return the result of accumulating the given transformation
3756		* of all keys
3757	+	* @since 1.8
3758		*/
3759	<	public double reduceKeysToDoubleSequentially
3760	<	(ToDoubleFunction<? super K> transformer,
3761	<	double basis,
3762	<	DoubleBinaryOperator reducer) {
3759	>	public double reduceKeysToDouble(long parallelismThreshold,
3760	>	ToDoubleFunction<? super K> transformer,
3761	>	double basis,
3762	>	DoubleBinaryOperator reducer) {
3763		if (transformer == null || reducer == null)
3764		throw new NullPointerException();
3765	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3766	<	double r = basis;
3767	<	while (it.advance() != null)
3516	<	r = reducer.applyAsDouble(r, transformer.applyAsDouble(it.nextKey));
3517	<	return r;
3765	>	return new MapReduceKeysToDoubleTask<K,V>
3766	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3767	>	null, transformer, basis, reducer).invoke();
3768		}
3769
3770		/**
#	Line 3522 | Line 3772 | public class ConcurrentHashMap<K, V>
3772		* of all keys using the given reducer to combine values, and
3773		* the given basis as an identity value.
3774		*
3775	+	* @param parallelismThreshold the (estimated) number of elements
3776	+	* needed for this operation to be executed in parallel
3777		* @param transformer a function returning the transformation
3778		* for an element
3779		* @param basis the identity (initial default value) for the reduction
3780		* @param reducer a commutative associative combining function
3781		* @return the result of accumulating the given transformation
3782		* of all keys
3783	+	* @since 1.8
3784		*/
3785	<	public long reduceKeysToLongSequentially
3786	<	(ToLongFunction<? super K> transformer,
3787	<	long basis,
3788	<	LongBinaryOperator reducer) {
3785	>	public long reduceKeysToLong(long parallelismThreshold,
3786	>	ToLongFunction<? super K> transformer,
3787	>	long basis,
3788	>	LongBinaryOperator reducer) {
3789		if (transformer == null || reducer == null)
3790		throw new NullPointerException();
3791	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3792	<	long r = basis;
3793	<	while (it.advance() != null)
3541	<	r = reducer.applyAsLong(r, transformer.applyAsLong(it.nextKey));
3542	<	return r;
3791	>	return new MapReduceKeysToLongTask<K,V>
3792	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3793	>	null, transformer, basis, reducer).invoke();
3794		}
3795
3796		/**
#	Line 3547 | Line 3798 | public class ConcurrentHashMap<K, V>
3798		* of all keys using the given reducer to combine values, and
3799		* the given basis as an identity value.
3800		*
3801	+	* @param parallelismThreshold the (estimated) number of elements
3802	+	* needed for this operation to be executed in parallel
3803		* @param transformer a function returning the transformation
3804		* for an element
3805		* @param basis the identity (initial default value) for the reduction
3806		* @param reducer a commutative associative combining function
3807		* @return the result of accumulating the given transformation
3808		* of all keys
3809	+	* @since 1.8
3810		*/
3811	<	public int reduceKeysToIntSequentially
3812	<	(ToIntFunction<? super K> transformer,
3813	<	int basis,
3814	<	IntBinaryOperator reducer) {
3811	>	public int reduceKeysToInt(long parallelismThreshold,
3812	>	ToIntFunction<? super K> transformer,
3813	>	int basis,
3814	>	IntBinaryOperator reducer) {
3815		if (transformer == null || reducer == null)
3816		throw new NullPointerException();
3817	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3818	<	int r = basis;
3819	<	while (it.advance() != null)
3566	<	r = reducer.applyAsInt(r, transformer.applyAsInt(it.nextKey));
3567	<	return r;
3817	>	return new MapReduceKeysToIntTask<K,V>
3818	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3819	>	null, transformer, basis, reducer).invoke();
3820		}
3821
3822		/**
3823		* Performs the given action for each value.
3824		*
3825	+	* @param parallelismThreshold the (estimated) number of elements
3826	+	* needed for this operation to be executed in parallel
3827		* @param action the action
3828	+	* @since 1.8
3829		*/
3830	<	public void forEachValueSequentially(Consumer<? super V> action) {
3831	<	if (action == null) throw new NullPointerException();
3832	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3833	<	V v;
3834	<	while ((v = it.advance()) != null)
3835	<	action.accept(v);
3830	>	public void forEachValue(long parallelismThreshold,
3831	>	Consumer<? super V> action) {
3832	>	if (action == null)
3833	>	throw new NullPointerException();
3834	>	new ForEachValueTask<K,V>
3835	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3836	>	action).invoke();
3837		}
3838
3839		/**
3840		* Performs the given action for each non-null transformation
3841		* of each value.
3842		*
3843	+	* @param parallelismThreshold the (estimated) number of elements
3844	+	* needed for this operation to be executed in parallel
3845		* @param transformer a function returning the transformation
3846		* for an element, or null if there is no transformation (in
3847		* which case the action is not applied)
3848	+	* @param action the action
3849	+	* @since 1.8
3850		*/
3851	<	public <U> void forEachValueSequentially
3852	<	(Function<? super V, ? extends U> transformer,
3853	<	Consumer<? super U> action) {
3851	>	public <U> void forEachValue(long parallelismThreshold,
3852	>	Function<? super V, ? extends U> transformer,
3853	>	Consumer<? super U> action) {
3854		if (transformer == null || action == null)
3855		throw new NullPointerException();
3856	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3857	<	V v; U u;
3858	<	while ((v = it.advance()) != null) {
3599	<	if ((u = transformer.apply(v)) != null)
3600	<	action.accept(u);
3601	<	}
3856	>	new ForEachTransformedValueTask<K,V,U>
3857	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3858	>	transformer, action).invoke();
3859		}
3860
3861		/**
3862		* Returns a non-null result from applying the given search
3863	<	* function on each value, or null if none.
3863	>	* function on each value, or null if none.  Upon success,
3864	>	* further element processing is suppressed and the results of
3865	>	* any other parallel invocations of the search function are
3866	>	* ignored.
3867		*
3868	+	* @param parallelismThreshold the (estimated) number of elements
3869	+	* needed for this operation to be executed in parallel
3870		* @param searchFunction a function returning a non-null
3871		* result on success, else null
3872		* @return a non-null result from applying the given search
3873		* function on each value, or null if none
3874	+	* @since 1.8
3875		*/
3876	<	public <U> U searchValuesSequentially
3877	<	(Function<? super V, ? extends U> searchFunction) {
3876	>	public <U> U searchValues(long parallelismThreshold,
3877	>	Function<? super V, ? extends U> searchFunction) {
3878		if (searchFunction == null) throw new NullPointerException();
3879	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3880	<	V v; U u;
3881	<	while ((v = it.advance()) != null) {
3619	<	if ((u = searchFunction.apply(v)) != null)
3620	<	return u;
3621	<	}
3622	<	return null;
3879	>	return new SearchValuesTask<K,V,U>
3880	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3881	>	searchFunction, new AtomicReference<U>()).invoke();
3882		}
3883
3884		/**
3885		* Returns the result of accumulating all values using the
3886		* given reducer to combine values, or null if none.
3887		*
3888	+	* @param parallelismThreshold the (estimated) number of elements
3889	+	* needed for this operation to be executed in parallel
3890		* @param reducer a commutative associative combining function
3891		* @return the result of accumulating all values
3892	+	* @since 1.8
3893		*/
3894	<	public V reduceValuesSequentially
3895	<	(BiFunction<? super V, ? super V, ? extends V> reducer) {
3894	>	public V reduceValues(long parallelismThreshold,
3895	>	BiFunction<? super V, ? super V, ? extends V> reducer) {
3896		if (reducer == null) throw new NullPointerException();
3897	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3898	<	V r = null; V v;
3899	<	while ((v = it.advance()) != null)
3638	<	r = (r == null) ? v : reducer.apply(r, v);
3639	<	return r;
3897	>	return new ReduceValuesTask<K,V>
3898	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3899	>	null, reducer).invoke();
3900		}
3901
3902		/**
#	Line 3644 | Line 3904 | public class ConcurrentHashMap<K, V>
3904		* of all values using the given reducer to combine values, or
3905		* null if none.
3906		*
3907	+	* @param parallelismThreshold the (estimated) number of elements
3908	+	* needed for this operation to be executed in parallel
3909		* @param transformer a function returning the transformation
3910		* for an element, or null if there is no transformation (in
3911		* which case it is not combined)
3912		* @param reducer a commutative associative combining function
3913		* @return the result of accumulating the given transformation
3914		* of all values
3915	+	* @since 1.8
3916		*/
3917	<	public <U> U reduceValuesSequentially
3918	<	(Function<? super V, ? extends U> transformer,
3919	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
3917	>	public <U> U reduceValues(long parallelismThreshold,
3918	>	Function<? super V, ? extends U> transformer,
3919	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
3920		if (transformer == null || reducer == null)
3921		throw new NullPointerException();
3922	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3923	<	U r = null, u; V v;
3924	<	while ((v = it.advance()) != null) {
3662	<	if ((u = transformer.apply(v)) != null)
3663	<	r = (r == null) ? u : reducer.apply(r, u);
3664	<	}
3665	<	return r;
3922	>	return new MapReduceValuesTask<K,V,U>
3923	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3924	>	null, transformer, reducer).invoke();
3925		}
3926
3927		/**
#	Line 3670 | Line 3929 | public class ConcurrentHashMap<K, V>
3929		* of all values using the given reducer to combine values,
3930		* and the given basis as an identity value.
3931		*
3932	+	* @param parallelismThreshold the (estimated) number of elements
3933	+	* needed for this operation to be executed in parallel
3934		* @param transformer a function returning the transformation
3935		* for an element
3936		* @param basis the identity (initial default value) for the reduction
3937		* @param reducer a commutative associative combining function
3938		* @return the result of accumulating the given transformation
3939		* of all values
3940	+	* @since 1.8
3941		*/
3942	<	public double reduceValuesToDoubleSequentially
3943	<	(ToDoubleFunction<? super V> transformer,
3944	<	double basis,
3945	<	DoubleBinaryOperator reducer) {
3942	>	public double reduceValuesToDouble(long parallelismThreshold,
3943	>	ToDoubleFunction<? super V> transformer,
3944	>	double basis,
3945	>	DoubleBinaryOperator reducer) {
3946		if (transformer == null || reducer == null)
3947		throw new NullPointerException();
3948	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3949	<	double r = basis; V v;
3950	<	while ((v = it.advance()) != null)
3689	<	r = reducer.applyAsDouble(r, transformer.applyAsDouble(v));
3690	<	return r;
3948	>	return new MapReduceValuesToDoubleTask<K,V>
3949	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3950	>	null, transformer, basis, reducer).invoke();
3951		}
3952
3953		/**
#	Line 3695 | Line 3955 | public class ConcurrentHashMap<K, V>
3955		* of all values using the given reducer to combine values,
3956		* and the given basis as an identity value.
3957		*
3958	+	* @param parallelismThreshold the (estimated) number of elements
3959	+	* needed for this operation to be executed in parallel
3960		* @param transformer a function returning the transformation
3961		* for an element
3962		* @param basis the identity (initial default value) for the reduction
3963		* @param reducer a commutative associative combining function
3964		* @return the result of accumulating the given transformation
3965		* of all values
3966	+	* @since 1.8
3967		*/
3968	<	public long reduceValuesToLongSequentially
3969	<	(ToLongFunction<? super V> transformer,
3970	<	long basis,
3971	<	LongBinaryOperator reducer) {
3968	>	public long reduceValuesToLong(long parallelismThreshold,
3969	>	ToLongFunction<? super V> transformer,
3970	>	long basis,
3971	>	LongBinaryOperator reducer) {
3972		if (transformer == null || reducer == null)
3973		throw new NullPointerException();
3974	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3975	<	long r = basis; V v;
3976	<	while ((v = it.advance()) != null)
3714	<	r = reducer.applyAsLong(r, transformer.applyAsLong(v));
3715	<	return r;
3974	>	return new MapReduceValuesToLongTask<K,V>
3975	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3976	>	null, transformer, basis, reducer).invoke();
3977		}
3978
3979		/**
#	Line 3720 | Line 3981 | public class ConcurrentHashMap<K, V>
3981		* of all values using the given reducer to combine values,
3982		* and the given basis as an identity value.
3983		*
3984	+	* @param parallelismThreshold the (estimated) number of elements
3985	+	* needed for this operation to be executed in parallel
3986		* @param transformer a function returning the transformation
3987		* for an element
3988		* @param basis the identity (initial default value) for the reduction
3989		* @param reducer a commutative associative combining function
3990		* @return the result of accumulating the given transformation
3991		* of all values
3992	+	* @since 1.8
3993		*/
3994	<	public int reduceValuesToIntSequentially
3995	<	(ToIntFunction<? super V> transformer,
3996	<	int basis,
3997	<	IntBinaryOperator reducer) {
3994	>	public int reduceValuesToInt(long parallelismThreshold,
3995	>	ToIntFunction<? super V> transformer,
3996	>	int basis,
3997	>	IntBinaryOperator reducer) {
3998		if (transformer == null || reducer == null)
3999		throw new NullPointerException();
4000	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4001	<	int r = basis; V v;
4002	<	while ((v = it.advance()) != null)
3739	<	r = reducer.applyAsInt(r, transformer.applyAsInt(v));
3740	<	return r;
4000	>	return new MapReduceValuesToIntTask<K,V>
4001	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4002	>	null, transformer, basis, reducer).invoke();
4003		}
4004
4005		/**
4006		* Performs the given action for each entry.
4007		*
4008	+	* @param parallelismThreshold the (estimated) number of elements
4009	+	* needed for this operation to be executed in parallel
4010		* @param action the action
4011	+	* @since 1.8
4012		*/
4013	<	public void forEachEntrySequentially
4014	<	(Consumer<? super Map.Entry<K,V>> action) {
4013	>	public void forEachEntry(long parallelismThreshold,
4014	>	Consumer<? super Map.Entry<K,V>> action) {
4015		if (action == null) throw new NullPointerException();
4016	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4017	<	V v;
3753	<	while ((v = it.advance()) != null)
3754	<	action.accept(entryFor(it.nextKey, v));
4016	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
4017	>	action).invoke();
4018		}
4019
4020		/**
4021		* Performs the given action for each non-null transformation
4022		* of each entry.
4023		*
4024	+	* @param parallelismThreshold the (estimated) number of elements
4025	+	* needed for this operation to be executed in parallel
4026		* @param transformer a function returning the transformation
4027		* for an element, or null if there is no transformation (in
4028		* which case the action is not applied)
4029		* @param action the action
4030	+	* @since 1.8
4031		*/
4032	<	public <U> void forEachEntrySequentially
4033	<	(Function<Map.Entry<K,V>, ? extends U> transformer,
4034	<	Consumer<? super U> action) {
4032	>	public <U> void forEachEntry(long parallelismThreshold,
4033	>	Function<Map.Entry<K,V>, ? extends U> transformer,
4034	>	Consumer<? super U> action) {
4035		if (transformer == null || action == null)
4036		throw new NullPointerException();
4037	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4038	<	V v; U u;
4039	<	while ((v = it.advance()) != null) {
3774	<	if ((u = transformer.apply(entryFor(it.nextKey, v))) != null)
3775	<	action.accept(u);
3776	<	}
4037	>	new ForEachTransformedEntryTask<K,V,U>
4038	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4039	>	transformer, action).invoke();
4040		}
4041
4042		/**
4043		* Returns a non-null result from applying the given search
4044	<	* function on each entry, or null if none.
4044	>	* function on each entry, or null if none.  Upon success,
4045	>	* further element processing is suppressed and the results of
4046	>	* any other parallel invocations of the search function are
4047	>	* ignored.
4048		*
4049	+	* @param parallelismThreshold the (estimated) number of elements
4050	+	* needed for this operation to be executed in parallel
4051		* @param searchFunction a function returning a non-null
4052		* result on success, else null
4053		* @return a non-null result from applying the given search
4054		* function on each entry, or null if none
4055	+	* @since 1.8
4056		*/
4057	<	public <U> U searchEntriesSequentially
4058	<	(Function<Map.Entry<K,V>, ? extends U> searchFunction) {
4057	>	public <U> U searchEntries(long parallelismThreshold,
4058	>	Function<Map.Entry<K,V>, ? extends U> searchFunction) {
4059		if (searchFunction == null) throw new NullPointerException();
4060	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4061	<	V v; U u;
4062	<	while ((v = it.advance()) != null) {
3794	<	if ((u = searchFunction.apply(entryFor(it.nextKey, v))) != null)
3795	<	return u;
3796	<	}
3797	<	return null;
4060	>	return new SearchEntriesTask<K,V,U>
4061	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4062	>	searchFunction, new AtomicReference<U>()).invoke();
4063		}
4064
4065		/**
4066		* Returns the result of accumulating all entries using the
4067		* given reducer to combine values, or null if none.
4068		*
4069	+	* @param parallelismThreshold the (estimated) number of elements
4070	+	* needed for this operation to be executed in parallel
4071		* @param reducer a commutative associative combining function
4072		* @return the result of accumulating all entries
4073	+	* @since 1.8
4074		*/
4075	<	public Map.Entry<K,V> reduceEntriesSequentially
4076	<	(BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4075	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4076	>	BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4077		if (reducer == null) throw new NullPointerException();
4078	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4079	<	Map.Entry<K,V> r = null; V v;
4080	<	while ((v = it.advance()) != null) {
3813	<	Map.Entry<K,V> u = entryFor(it.nextKey, v);
3814	<	r = (r == null) ? u : reducer.apply(r, u);
3815	<	}
3816	<	return r;
4078	>	return new ReduceEntriesTask<K,V>
4079	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4080	>	null, reducer).invoke();
4081		}
4082
4083		/**
#	Line 3821 | Line 4085 | public class ConcurrentHashMap<K, V>
4085		* of all entries using the given reducer to combine values,
4086		* or null if none.
4087		*
4088	+	* @param parallelismThreshold the (estimated) number of elements
4089	+	* needed for this operation to be executed in parallel
4090		* @param transformer a function returning the transformation
4091		* for an element, or null if there is no transformation (in
4092		* which case it is not combined)
4093		* @param reducer a commutative associative combining function
4094		* @return the result of accumulating the given transformation
4095		* of all entries
4096	+	* @since 1.8
4097		*/
4098	<	public <U> U reduceEntriesSequentially
4099	<	(Function<Map.Entry<K,V>, ? extends U> transformer,
4100	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
4098	>	public <U> U reduceEntries(long parallelismThreshold,
4099	>	Function<Map.Entry<K,V>, ? extends U> transformer,
4100	>	BiFunction<? super U, ? super U, ? extends U> reducer) {
4101		if (transformer == null || reducer == null)
4102		throw new NullPointerException();
4103	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4104	<	U r = null, u; V v;
4105	<	while ((v = it.advance()) != null) {
3839	<	if ((u = transformer.apply(entryFor(it.nextKey, v))) != null)
3840	<	r = (r == null) ? u : reducer.apply(r, u);
3841	<	}
3842	<	return r;
4103	>	return new MapReduceEntriesTask<K,V,U>
4104	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4105	>	null, transformer, reducer).invoke();
4106		}
4107
4108		/**
#	Line 3847 | Line 4110 | public class ConcurrentHashMap<K, V>
4110		* of all entries using the given reducer to combine values,
4111		* and the given basis as an identity value.
4112		*
4113	+	* @param parallelismThreshold the (estimated) number of elements
4114	+	* needed for this operation to be executed in parallel
4115		* @param transformer a function returning the transformation
4116		* for an element
4117		* @param basis the identity (initial default value) for the reduction
4118		* @param reducer a commutative associative combining function
4119		* @return the result of accumulating the given transformation
4120		* of all entries
4121	+	* @since 1.8
4122		*/
4123	<	public double reduceEntriesToDoubleSequentially
4124	<	(ToDoubleFunction<Map.Entry<K,V>> transformer,
4125	<	double basis,
4126	<	DoubleBinaryOperator reducer) {
4123	>	public double reduceEntriesToDouble(long parallelismThreshold,
4124	>	ToDoubleFunction<Map.Entry<K,V>> transformer,
4125	>	double basis,
4126	>	DoubleBinaryOperator reducer) {
4127		if (transformer == null || reducer == null)
4128		throw new NullPointerException();
4129	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4130	<	double r = basis; V v;
4131	<	while ((v = it.advance()) != null)
3866	<	r = reducer.applyAsDouble(r, transformer.applyAsDouble(entryFor(it.nextKey, v)));
3867	<	return r;
4129	>	return new MapReduceEntriesToDoubleTask<K,V>
4130	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4131	>	null, transformer, basis, reducer).invoke();
4132		}
4133
4134		/**
#	Line 3872 | Line 4136 | public class ConcurrentHashMap<K, V>
4136		* of all entries using the given reducer to combine values,
4137		* and the given basis as an identity value.
4138		*
4139	+	* @param parallelismThreshold the (estimated) number of elements
4140	+	* needed for this operation to be executed in parallel
4141		* @param transformer a function returning the transformation
4142		* for an element
4143		* @param basis the identity (initial default value) for the reduction
4144		* @param reducer a commutative associative combining function
4145		* @return the result of accumulating the given transformation
4146		* of all entries
4147	+	* @since 1.8
4148		*/
4149	<	public long reduceEntriesToLongSequentially
4150	<	(ToLongFunction<Map.Entry<K,V>> transformer,
4151	<	long basis,
4152	<	LongBinaryOperator reducer) {
4149	>	public long reduceEntriesToLong(long parallelismThreshold,
4150	>	ToLongFunction<Map.Entry<K,V>> transformer,
4151	>	long basis,
4152	>	LongBinaryOperator reducer) {
4153		if (transformer == null || reducer == null)
4154		throw new NullPointerException();
4155	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4156	<	long r = basis; V v;
4157	<	while ((v = it.advance()) != null)
3891	<	r = reducer.applyAsLong(r, transformer.applyAsLong(entryFor(it.nextKey, v)));
3892	<	return r;
4155	>	return new MapReduceEntriesToLongTask<K,V>
4156	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4157	>	null, transformer, basis, reducer).invoke();
4158		}
4159
4160		/**
#	Line 3897 | Line 4162 | public class ConcurrentHashMap<K, V>
4162		* of all entries using the given reducer to combine values,
4163		* and the given basis as an identity value.
4164		*
4165	+	* @param parallelismThreshold the (estimated) number of elements
4166	+	* needed for this operation to be executed in parallel
4167		* @param transformer a function returning the transformation
4168		* for an element
4169		* @param basis the identity (initial default value) for the reduction
4170		* @param reducer a commutative associative combining function
4171		* @return the result of accumulating the given transformation
4172		* of all entries
4173	+	* @since 1.8
4174		*/
4175	<	public int reduceEntriesToIntSequentially
4176	<	(ToIntFunction<Map.Entry<K,V>> transformer,
4177	<	int basis,
4178	<	IntBinaryOperator reducer) {
4175	>	public int reduceEntriesToInt(long parallelismThreshold,
4176	>	ToIntFunction<Map.Entry<K,V>> transformer,
4177	>	int basis,
4178	>	IntBinaryOperator reducer) {
4179		if (transformer == null || reducer == null)
4180		throw new NullPointerException();
4181	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4182	<	int r = basis; V v;
4183	<	while ((v = it.advance()) != null)
3916	<	r = reducer.applyAsInt(r, transformer.applyAsInt(entryFor(it.nextKey, v)));
3917	<	return r;
3918	<	}
3919	<
3920	<	// Parallel bulk operations
3921	<
3922	<	/**
3923	<	* Performs the given action for each (key, value).
3924	<	*
3925	<	* @param action the action
3926	<	*/
3927	<	public void forEachInParallel(BiConsumer<? super K,? super V> action) {
3928	<	ForkJoinTasks.forEach
3929	<	(this, action).invoke();
3930	<	}
3931	<
3932	<	/**
3933	<	* Performs the given action for each non-null transformation
3934	<	* of each (key, value).
3935	<	*
3936	<	* @param transformer a function returning the transformation
3937	<	* for an element, or null if there is no transformation (in
3938	<	* which case the action is not applied)
3939	<	* @param action the action
3940	<	*/
3941	<	public <U> void forEachInParallel
3942	<	(BiFunction<? super K, ? super V, ? extends U> transformer,
3943	<	Consumer<? super U> action) {
3944	<	ForkJoinTasks.forEach
3945	<	(this, transformer, action).invoke();
3946	<	}
3947	<
3948	<	/**
3949	<	* Returns a non-null result from applying the given search
3950	<	* function on each (key, value), or null if none.  Upon
3951	<	* success, further element processing is suppressed and the
3952	<	* results of any other parallel invocations of the search
3953	<	* function are ignored.
3954	<	*
3955	<	* @param searchFunction a function returning a non-null
3956	<	* result on success, else null
3957	<	* @return a non-null result from applying the given search
3958	<	* function on each (key, value), or null if none
3959	<	*/
3960	<	public <U> U searchInParallel
3961	<	(BiFunction<? super K, ? super V, ? extends U> searchFunction) {
3962	<	return ForkJoinTasks.search
3963	<	(this, searchFunction).invoke();
3964	<	}
3965	<
3966	<	/**
3967	<	* Returns the result of accumulating the given transformation
3968	<	* of all (key, value) pairs using the given reducer to
3969	<	* combine values, or null if none.
3970	<	*
3971	<	* @param transformer a function returning the transformation
3972	<	* for an element, or null if there is no transformation (in
3973	<	* which case it is not combined)
3974	<	* @param reducer a commutative associative combining function
3975	<	* @return the result of accumulating the given transformation
3976	<	* of all (key, value) pairs
3977	<	*/
3978	<	public <U> U reduceInParallel
3979	<	(BiFunction<? super K, ? super V, ? extends U> transformer,
3980	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
3981	<	return ForkJoinTasks.reduce
3982	<	(this, transformer, reducer).invoke();
3983	<	}
3984	<
3985	<	/**
3986	<	* Returns the result of accumulating the given transformation
3987	<	* of all (key, value) pairs using the given reducer to
3988	<	* combine values, and the given basis as an identity value.
3989	<	*
3990	<	* @param transformer a function returning the transformation
3991	<	* for an element
3992	<	* @param basis the identity (initial default value) for the reduction
3993	<	* @param reducer a commutative associative combining function
3994	<	* @return the result of accumulating the given transformation
3995	<	* of all (key, value) pairs
3996	<	*/
3997	<	public double reduceToDoubleInParallel
3998	<	(ToDoubleBiFunction<? super K, ? super V> transformer,
3999	<	double basis,
4000	<	DoubleBinaryOperator reducer) {
4001	<	return ForkJoinTasks.reduceToDouble
4002	<	(this, transformer, basis, reducer).invoke();
4003	<	}
4004	<
4005	<	/**
4006	<	* Returns the result of accumulating the given transformation
4007	<	* of all (key, value) pairs using the given reducer to
4008	<	* combine values, and the given basis as an identity value.
4009	<	*
4010	<	* @param transformer a function returning the transformation
4011	<	* for an element
4012	<	* @param basis the identity (initial default value) for the reduction
4013	<	* @param reducer a commutative associative combining function
4014	<	* @return the result of accumulating the given transformation
4015	<	* of all (key, value) pairs
4016	<	*/
4017	<	public long reduceToLongInParallel
4018	<	(ToLongBiFunction<? super K, ? super V> transformer,
4019	<	long basis,
4020	<	LongBinaryOperator reducer) {
4021	<	return ForkJoinTasks.reduceToLong
4022	<	(this, transformer, basis, reducer).invoke();
4023	<	}
4024	<
4025	<	/**
4026	<	* Returns the result of accumulating the given transformation
4027	<	* of all (key, value) pairs using the given reducer to
4028	<	* combine values, and the given basis as an identity value.
4029	<	*
4030	<	* @param transformer a function returning the transformation
4031	<	* for an element
4032	<	* @param basis the identity (initial default value) for the reduction
4033	<	* @param reducer a commutative associative combining function
4034	<	* @return the result of accumulating the given transformation
4035	<	* of all (key, value) pairs
4036	<	*/
4037	<	public int reduceToIntInParallel
4038	<	(ToIntBiFunction<? super K, ? super V> transformer,
4039	<	int basis,
4040	<	IntBinaryOperator reducer) {
4041	<	return ForkJoinTasks.reduceToInt
4042	<	(this, transformer, basis, reducer).invoke();
4043	<	}
4044	<
4045	<	/**
4046	<	* Performs the given action for each key.
4047	<	*
4048	<	* @param action the action
4049	<	*/
4050	<	public void forEachKeyInParallel(Consumer<? super K> action) {
4051	<	ForkJoinTasks.forEachKey
4052	<	(this, action).invoke();
4053	<	}
4054	<
4055	<	/**
4056	<	* Performs the given action for each non-null transformation
4057	<	* of each key.
4058	<	*
4059	<	* @param transformer a function returning the transformation
4060	<	* for an element, or null if there is no transformation (in
4061	<	* which case the action is not applied)
4062	<	* @param action the action
4063	<	*/
4064	<	public <U> void forEachKeyInParallel
4065	<	(Function<? super K, ? extends U> transformer,
4066	<	Consumer<? super U> action) {
4067	<	ForkJoinTasks.forEachKey
4068	<	(this, transformer, action).invoke();
4069	<	}
4070	<
4071	<	/**
4072	<	* Returns a non-null result from applying the given search
4073	<	* function on each key, or null if none. Upon success,
4074	<	* further element processing is suppressed and the results of
4075	<	* any other parallel invocations of the search function are
4076	<	* ignored.
4077	<	*
4078	<	* @param searchFunction a function returning a non-null
4079	<	* result on success, else null
4080	<	* @return a non-null result from applying the given search
4081	<	* function on each key, or null if none
4082	<	*/
4083	<	public <U> U searchKeysInParallel
4084	<	(Function<? super K, ? extends U> searchFunction) {
4085	<	return ForkJoinTasks.searchKeys
4086	<	(this, searchFunction).invoke();
4087	<	}
4088	<
4089	<	/**
4090	<	* Returns the result of accumulating all keys using the given
4091	<	* reducer to combine values, or null if none.
4092	<	*
4093	<	* @param reducer a commutative associative combining function
4094	<	* @return the result of accumulating all keys using the given
4095	<	* reducer to combine values, or null if none
4096	<	*/
4097	<	public K reduceKeysInParallel
4098	<	(BiFunction<? super K, ? super K, ? extends K> reducer) {
4099	<	return ForkJoinTasks.reduceKeys
4100	<	(this, reducer).invoke();
4101	<	}
4102	<
4103	<	/**
4104	<	* Returns the result of accumulating the given transformation
4105	<	* of all keys using the given reducer to combine values, or
4106	<	* null if none.
4107	<	*
4108	<	* @param transformer a function returning the transformation
4109	<	* for an element, or null if there is no transformation (in
4110	<	* which case it is not combined)
4111	<	* @param reducer a commutative associative combining function
4112	<	* @return the result of accumulating the given transformation
4113	<	* of all keys
4114	<	*/
4115	<	public <U> U reduceKeysInParallel
4116	<	(Function<? super K, ? extends U> transformer,
4117	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
4118	<	return ForkJoinTasks.reduceKeys
4119	<	(this, transformer, reducer).invoke();
4120	<	}
4121	<
4122	<	/**
4123	<	* Returns the result of accumulating the given transformation
4124	<	* of all keys using the given reducer to combine values, and
4125	<	* the given basis as an identity value.
4126	<	*
4127	<	* @param transformer a function returning the transformation
4128	<	* for an element
4129	<	* @param basis the identity (initial default value) for the reduction
4130	<	* @param reducer a commutative associative combining function
4131	<	* @return the result of accumulating the given transformation
4132	<	* of all keys
4133	<	*/
4134	<	public double reduceKeysToDoubleInParallel
4135	<	(ToDoubleFunction<? super K> transformer,
4136	<	double basis,
4137	<	DoubleBinaryOperator reducer) {
4138	<	return ForkJoinTasks.reduceKeysToDouble
4139	<	(this, transformer, basis, reducer).invoke();
4140	<	}
4141	<
4142	<	/**
4143	<	* Returns the result of accumulating the given transformation
4144	<	* of all keys using the given reducer to combine values, and
4145	<	* the given basis as an identity value.
4146	<	*
4147	<	* @param transformer a function returning the transformation
4148	<	* for an element
4149	<	* @param basis the identity (initial default value) for the reduction
4150	<	* @param reducer a commutative associative combining function
4151	<	* @return the result of accumulating the given transformation
4152	<	* of all keys
4153	<	*/
4154	<	public long reduceKeysToLongInParallel
4155	<	(ToLongFunction<? super K> transformer,
4156	<	long basis,
4157	<	LongBinaryOperator reducer) {
4158	<	return ForkJoinTasks.reduceKeysToLong
4159	<	(this, transformer, basis, reducer).invoke();
4160	<	}
4161	<
4162	<	/**
4163	<	* Returns the result of accumulating the given transformation
4164	<	* of all keys using the given reducer to combine values, and
4165	<	* the given basis as an identity value.
4166	<	*
4167	<	* @param transformer a function returning the transformation
4168	<	* for an element
4169	<	* @param basis the identity (initial default value) for the reduction
4170	<	* @param reducer a commutative associative combining function
4171	<	* @return the result of accumulating the given transformation
4172	<	* of all keys
4173	<	*/
4174	<	public int reduceKeysToIntInParallel
4175	<	(ToIntFunction<? super K> transformer,
4176	<	int basis,
4177	<	IntBinaryOperator reducer) {
4178	<	return ForkJoinTasks.reduceKeysToInt
4179	<	(this, transformer, basis, reducer).invoke();
4180	<	}
4181	<
4182	<	/**
4183	<	* Performs the given action for each value.
4184	<	*
4185	<	* @param action the action
4186	<	*/
4187	<	public void forEachValueInParallel(Consumer<? super V> action) {
4188	<	ForkJoinTasks.forEachValue
4189	<	(this, action).invoke();
4190	<	}
4191	<
4192	<	/**
4193	<	* Performs the given action for each non-null transformation
4194	<	* of each value.
4195	<	*
4196	<	* @param transformer a function returning the transformation
4197	<	* for an element, or null if there is no transformation (in
4198	<	* which case the action is not applied)
4199	<	*/
4200	<	public <U> void forEachValueInParallel
4201	<	(Function<? super V, ? extends U> transformer,
4202	<	Consumer<? super U> action) {
4203	<	ForkJoinTasks.forEachValue
4204	<	(this, transformer, action).invoke();
4205	<	}
4206	<
4207	<	/**
4208	<	* Returns a non-null result from applying the given search
4209	<	* function on each value, or null if none.  Upon success,
4210	<	* further element processing is suppressed and the results of
4211	<	* any other parallel invocations of the search function are
4212	<	* ignored.
4213	<	*
4214	<	* @param searchFunction a function returning a non-null
4215	<	* result on success, else null
4216	<	* @return a non-null result from applying the given search
4217	<	* function on each value, or null if none
4218	<	*/
4219	<	public <U> U searchValuesInParallel
4220	<	(Function<? super V, ? extends U> searchFunction) {
4221	<	return ForkJoinTasks.searchValues
4222	<	(this, searchFunction).invoke();
4223	<	}
4224	<
4225	<	/**
4226	<	* Returns the result of accumulating all values using the
4227	<	* given reducer to combine values, or null if none.
4228	<	*
4229	<	* @param reducer a commutative associative combining function
4230	<	* @return the result of accumulating all values
4231	<	*/
4232	<	public V reduceValuesInParallel
4233	<	(BiFunction<? super V, ? super V, ? extends V> reducer) {
4234	<	return ForkJoinTasks.reduceValues
4235	<	(this, reducer).invoke();
4236	<	}
4237	<
4238	<	/**
4239	<	* Returns the result of accumulating the given transformation
4240	<	* of all values using the given reducer to combine values, or
4241	<	* null if none.
4242	<	*
4243	<	* @param transformer a function returning the transformation
4244	<	* for an element, or null if there is no transformation (in
4245	<	* which case it is not combined)
4246	<	* @param reducer a commutative associative combining function
4247	<	* @return the result of accumulating the given transformation
4248	<	* of all values
4249	<	*/
4250	<	public <U> U reduceValuesInParallel
4251	<	(Function<? super V, ? extends U> transformer,
4252	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
4253	<	return ForkJoinTasks.reduceValues
4254	<	(this, transformer, reducer).invoke();
4255	<	}
4256	<
4257	<	/**
4258	<	* Returns the result of accumulating the given transformation
4259	<	* of all values using the given reducer to combine values,
4260	<	* and the given basis as an identity value.
4261	<	*
4262	<	* @param transformer a function returning the transformation
4263	<	* for an element
4264	<	* @param basis the identity (initial default value) for the reduction
4265	<	* @param reducer a commutative associative combining function
4266	<	* @return the result of accumulating the given transformation
4267	<	* of all values
4268	<	*/
4269	<	public double reduceValuesToDoubleInParallel
4270	<	(ToDoubleFunction<? super V> transformer,
4271	<	double basis,
4272	<	DoubleBinaryOperator reducer) {
4273	<	return ForkJoinTasks.reduceValuesToDouble
4274	<	(this, transformer, basis, reducer).invoke();
4275	<	}
4276	<
4277	<	/**
4278	<	* Returns the result of accumulating the given transformation
4279	<	* of all values using the given reducer to combine values,
4280	<	* and the given basis as an identity value.
4281	<	*
4282	<	* @param transformer a function returning the transformation
4283	<	* for an element
4284	<	* @param basis the identity (initial default value) for the reduction
4285	<	* @param reducer a commutative associative combining function
4286	<	* @return the result of accumulating the given transformation
4287	<	* of all values
4288	<	*/
4289	<	public long reduceValuesToLongInParallel
4290	<	(ToLongFunction<? super V> transformer,
4291	<	long basis,
4292	<	LongBinaryOperator reducer) {
4293	<	return ForkJoinTasks.reduceValuesToLong
4294	<	(this, transformer, basis, reducer).invoke();
4295	<	}
4296	<
4297	<	/**
4298	<	* Returns the result of accumulating the given transformation
4299	<	* of all values using the given reducer to combine values,
4300	<	* and the given basis as an identity value.
4301	<	*
4302	<	* @param transformer a function returning the transformation
4303	<	* for an element
4304	<	* @param basis the identity (initial default value) for the reduction
4305	<	* @param reducer a commutative associative combining function
4306	<	* @return the result of accumulating the given transformation
4307	<	* of all values
4308	<	*/
4309	<	public int reduceValuesToIntInParallel
4310	<	(ToIntFunction<? super V> transformer,
4311	<	int basis,
4312	<	IntBinaryOperator reducer) {
4313	<	return ForkJoinTasks.reduceValuesToInt
4314	<	(this, transformer, basis, reducer).invoke();
4315	<	}
4316	<
4317	<	/**
4318	<	* Performs the given action for each entry.
4319	<	*
4320	<	* @param action the action
4321	<	*/
4322	<	public void forEachEntryInParallel(Consumer<? super Map.Entry<K,V>> action) {
4323	<	ForkJoinTasks.forEachEntry
4324	<	(this, action).invoke();
4325	<	}
4326	<
4327	<	/**
4328	<	* Performs the given action for each non-null transformation
4329	<	* of each entry.
4330	<	*
4331	<	* @param transformer a function returning the transformation
4332	<	* for an element, or null if there is no transformation (in
4333	<	* which case the action is not applied)
4334	<	* @param action the action
4335	<	*/
4336	<	public <U> void forEachEntryInParallel
4337	<	(Function<Map.Entry<K,V>, ? extends U> transformer,
4338	<	Consumer<? super U> action) {
4339	<	ForkJoinTasks.forEachEntry
4340	<	(this, transformer, action).invoke();
4341	<	}
4342	<
4343	<	/**
4344	<	* Returns a non-null result from applying the given search
4345	<	* function on each entry, or null if none.  Upon success,
4346	<	* further element processing is suppressed and the results of
4347	<	* any other parallel invocations of the search function are
4348	<	* ignored.
4349	<	*
4350	<	* @param searchFunction a function returning a non-null
4351	<	* result on success, else null
4352	<	* @return a non-null result from applying the given search
4353	<	* function on each entry, or null if none
4354	<	*/
4355	<	public <U> U searchEntriesInParallel
4356	<	(Function<Map.Entry<K,V>, ? extends U> searchFunction) {
4357	<	return ForkJoinTasks.searchEntries
4358	<	(this, searchFunction).invoke();
4359	<	}
4360	<
4361	<	/**
4362	<	* Returns the result of accumulating all entries using the
4363	<	* given reducer to combine values, or null if none.
4364	<	*
4365	<	* @param reducer a commutative associative combining function
4366	<	* @return the result of accumulating all entries
4367	<	*/
4368	<	public Map.Entry<K,V> reduceEntriesInParallel
4369	<	(BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4370	<	return ForkJoinTasks.reduceEntries
4371	<	(this, reducer).invoke();
4372	<	}
4373	<
4374	<	/**
4375	<	* Returns the result of accumulating the given transformation
4376	<	* of all entries using the given reducer to combine values,
4377	<	* or null if none.
4378	<	*
4379	<	* @param transformer a function returning the transformation
4380	<	* for an element, or null if there is no transformation (in
4381	<	* which case it is not combined)
4382	<	* @param reducer a commutative associative combining function
4383	<	* @return the result of accumulating the given transformation
4384	<	* of all entries
4385	<	*/
4386	<	public <U> U reduceEntriesInParallel
4387	<	(Function<Map.Entry<K,V>, ? extends U> transformer,
4388	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
4389	<	return ForkJoinTasks.reduceEntries
4390	<	(this, transformer, reducer).invoke();
4391	<	}
4392	<
4393	<	/**
4394	<	* Returns the result of accumulating the given transformation
4395	<	* of all entries using the given reducer to combine values,
4396	<	* and the given basis as an identity value.
4397	<	*
4398	<	* @param transformer a function returning the transformation
4399	<	* for an element
4400	<	* @param basis the identity (initial default value) for the reduction
4401	<	* @param reducer a commutative associative combining function
4402	<	* @return the result of accumulating the given transformation
4403	<	* of all entries
4404	<	*/
4405	<	public double reduceEntriesToDoubleInParallel
4406	<	(ToDoubleFunction<Map.Entry<K,V>> transformer,
4407	<	double basis,
4408	<	DoubleBinaryOperator reducer) {
4409	<	return ForkJoinTasks.reduceEntriesToDouble
4410	<	(this, transformer, basis, reducer).invoke();
4411	<	}
4412	<
4413	<	/**
4414	<	* Returns the result of accumulating the given transformation
4415	<	* of all entries using the given reducer to combine values,
4416	<	* and the given basis as an identity value.
4417	<	*
4418	<	* @param transformer a function returning the transformation
4419	<	* for an element
4420	<	* @param basis the identity (initial default value) for the reduction
4421	<	* @param reducer a commutative associative combining function
4422	<	* @return the result of accumulating the given transformation
4423	<	* of all entries
4424	<	*/
4425	<	public long reduceEntriesToLongInParallel
4426	<	(ToLongFunction<Map.Entry<K,V>> transformer,
4427	<	long basis,
4428	<	LongBinaryOperator reducer) {
4429	<	return ForkJoinTasks.reduceEntriesToLong
4430	<	(this, transformer, basis, reducer).invoke();
4431	<	}
4432	<
4433	<	/**
4434	<	* Returns the result of accumulating the given transformation
4435	<	* of all entries using the given reducer to combine values,
4436	<	* and the given basis as an identity value.
4437	<	*
4438	<	* @param transformer a function returning the transformation
4439	<	* for an element
4440	<	* @param basis the identity (initial default value) for the reduction
4441	<	* @param reducer a commutative associative combining function
4442	<	* @return the result of accumulating the given transformation
4443	<	* of all entries
4444	<	*/
4445	<	public int reduceEntriesToIntInParallel
4446	<	(ToIntFunction<Map.Entry<K,V>> transformer,
4447	<	int basis,
4448	<	IntBinaryOperator reducer) {
4449	<	return ForkJoinTasks.reduceEntriesToInt
4450	<	(this, transformer, basis, reducer).invoke();
4181	>	return new MapReduceEntriesToIntTask<K,V>
4182	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4183	>	null, transformer, basis, reducer).invoke();
4184		}
4185
4186
#	Line 4456 | Line 4189 | public class ConcurrentHashMap<K, V>
4189		/**
4190		* Base class for views.
4191		*/
4192	<	abstract static class CHMView<K, V> implements java.io.Serializable {
4192	>	abstract static class CollectionView<K,V,E>
4193	>	implements Collection<E>, java.io.Serializable {
4194		private static final long serialVersionUID = 7249069246763182397L;
4195	<	final ConcurrentHashMap<K, V> map;
4196	<	CHMView(ConcurrentHashMap<K, V> map)  { this.map = map; }
4195	>	final ConcurrentHashMap<K,V> map;
4196	>	CollectionView(ConcurrentHashMap<K,V> map)  { this.map = map; }
4197
4198		/**
4199		* Returns the map backing this view.
#	Line 4468 | Line 4202 | public class ConcurrentHashMap<K, V>
4202		*/
4203		public ConcurrentHashMap<K,V> getMap() { return map; }
4204
4205	<	public final int size()                 { return map.size(); }
4206	<	public final boolean isEmpty()          { return map.isEmpty(); }
4207	<	public final void clear()               { map.clear(); }
4205	>	/**
4206	>	* Removes all of the elements from this view, by removing all
4207	>	* the mappings from the map backing this view.
4208	>	*/
4209	>	public final void clear()      { map.clear(); }
4210	>	public final int size()        { return map.size(); }
4211	>	public final boolean isEmpty() { return map.isEmpty(); }
4212
4213		// implementations below rely on concrete classes supplying these
4214	<	public abstract Iterator<?> iterator();
4214	>	// abstract methods
4215	>	/**
4216	>	* Returns a "weakly consistent" iterator that will never
4217	>	* throw {@link ConcurrentModificationException}, and
4218	>	* guarantees to traverse elements as they existed upon
4219	>	* construction of the iterator, and may (but is not
4220	>	* guaranteed to) reflect any modifications subsequent to
4221	>	* construction.
4222	>	*/
4223	>	public abstract Iterator<E> iterator();
4224		public abstract boolean contains(Object o);
4225		public abstract boolean remove(Object o);
4226
#	Line 4481 | Line 4228 | public class ConcurrentHashMap<K, V>
4228
4229		public final Object[] toArray() {
4230		long sz = map.mappingCount();
4231	<	if (sz > (long)(MAX_ARRAY_SIZE))
4231	>	if (sz > MAX_ARRAY_SIZE)
4232		throw new OutOfMemoryError(oomeMsg);
4233		int n = (int)sz;
4234		Object[] r = new Object[n];
4235		int i = 0;
4236	<	Iterator<?> it = iterator();
4490	<	while (it.hasNext()) {
4236	>	for (E e : this) {
4237		if (i == n) {
4238		if (n >= MAX_ARRAY_SIZE)
4239		throw new OutOfMemoryError(oomeMsg);
#	Line 4497 | Line 4243 | public class ConcurrentHashMap<K, V>
4243		n += (n >>> 1) + 1;
4244		r = Arrays.copyOf(r, n);
4245		}
4246	<	r[i++] = it.next();
4246	>	r[i++] = e;
4247		}
4248		return (i == n) ? r : Arrays.copyOf(r, i);
4249		}
4250
4251	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4251	>	@SuppressWarnings("unchecked")
4252	>	public final <T> T[] toArray(T[] a) {
4253		long sz = map.mappingCount();
4254	<	if (sz > (long)(MAX_ARRAY_SIZE))
4254	>	if (sz > MAX_ARRAY_SIZE)
4255		throw new OutOfMemoryError(oomeMsg);
4256		int m = (int)sz;
4257		T[] r = (a.length >= m) ? a :
#	Line 4512 | Line 4259 | public class ConcurrentHashMap<K, V>
4259		.newInstance(a.getClass().getComponentType(), m);
4260		int n = r.length;
4261		int i = 0;
4262	<	Iterator<?> it = iterator();
4516	<	while (it.hasNext()) {
4262	>	for (E e : this) {
4263		if (i == n) {
4264		if (n >= MAX_ARRAY_SIZE)
4265		throw new OutOfMemoryError(oomeMsg);
#	Line 4523 | Line 4269 | public class ConcurrentHashMap<K, V>
4269		n += (n >>> 1) + 1;
4270		r = Arrays.copyOf(r, n);
4271		}
4272	<	r[i++] = (T)it.next();
4272	>	r[i++] = (T)e;
4273		}
4274		if (a == r && i < n) {
4275		r[i] = null; // null-terminate
#	Line 4532 | Line 4278 | public class ConcurrentHashMap<K, V>
4278		return (i == n) ? r : Arrays.copyOf(r, i);
4279		}
4280
4281	<	public final int hashCode() {
4282	<	int h = 0;
4283	<	for (Iterator<?> it = iterator(); it.hasNext();)
4284	<	h += it.next().hashCode();
4285	<	return h;
4286	<	}
4287	<
4281	>	/**
4282	>	* Returns a string representation of this collection.
4283	>	* The string representation consists of the string representations
4284	>	* of the collection's elements in the order they are returned by
4285	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4286	>	* Adjacent elements are separated by the characters {@code ", "}
4287	>	* (comma and space).  Elements are converted to strings as by
4288	>	* {@link String#valueOf(Object)}.
4289	>	*
4290	>	* @return a string representation of this collection
4291	>	*/
4292		public final String toString() {
4293		StringBuilder sb = new StringBuilder();
4294		sb.append('[');
4295	<	Iterator<?> it = iterator();
4295	>	Iterator<E> it = iterator();
4296		if (it.hasNext()) {
4297		for (;;) {
4298		Object e = it.next();
#	Line 4557 | Line 4307 | public class ConcurrentHashMap<K, V>
4307
4308		public final boolean containsAll(Collection<?> c) {
4309		if (c != this) {
4310	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
4561	<	Object e = it.next();
4310	>	for (Object e : c) {
4311		if (e == null || !contains(e))
4312		return false;
4313		}
#	Line 4568 | Line 4317 | public class ConcurrentHashMap<K, V>
4317
4318		public final boolean removeAll(Collection<?> c) {
4319		boolean modified = false;
4320	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4320	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4321		if (c.contains(it.next())) {
4322		it.remove();
4323		modified = true;
#	Line 4579 | Line 4328 | public class ConcurrentHashMap<K, V>
4328
4329		public final boolean retainAll(Collection<?> c) {
4330		boolean modified = false;
4331	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4331	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4332		if (!c.contains(it.next())) {
4333		it.remove();
4334		modified = true;
#	Line 4593 | Line 4342 | public class ConcurrentHashMap<K, V>
4342		/**
4343		* A view of a ConcurrentHashMap as a {@link Set} of keys, in
4344		* which additions may optionally be enabled by mapping to a
4345	<	* common value.  This class cannot be directly instantiated. See
4346	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4347	<	* {@link #newKeySet(int)}.
4345	>	* common value.  This class cannot be directly instantiated.
4346	>	* See {@link #keySet() keySet()},
4347	>	* {@link #keySet(Object) keySet(V)},
4348	>	* {@link #newKeySet() newKeySet()},
4349	>	* {@link #newKeySet(int) newKeySet(int)}.
4350	>	*
4351	>	* @since 1.8
4352		*/
4353	<	public static class KeySetView<K,V> extends CHMView<K,V>
4353	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4354		implements Set<K>, java.io.Serializable {
4355		private static final long serialVersionUID = 7249069246763182397L;
4356		private final V value;
4357	<	KeySetView(ConcurrentHashMap<K, V> map, V value) {  // non-public
4357	>	KeySetView(ConcurrentHashMap<K,V> map, V value) {  // non-public
4358		super(map);
4359		this.value = value;
4360		}
#	Line 4615 | Line 4368 | public class ConcurrentHashMap<K, V>
4368		*/
4369		public V getMappedValue() { return value; }
4370
4371	<	// implement Set API
4372	<
4371	>	/**
4372	>	* {@inheritDoc}
4373	>	* @throws NullPointerException if the specified key is null
4374	>	*/
4375		public boolean contains(Object o) { return map.containsKey(o); }
4621	–	public boolean remove(Object o)   { return map.remove(o) != null; }
4376
4377		/**
4378	<	* Returns a "weakly consistent" iterator that will never
4379	<	* throw {@link ConcurrentModificationException}, and
4380	<	* guarantees to traverse elements as they existed upon
4381	<	* construction of the iterator, and may (but is not
4382	<	* guaranteed to) reflect any modifications subsequent to
4383	<	* construction.
4378	>	* Removes the key from this map view, by removing the key (and its
4379	>	* corresponding value) from the backing map.  This method does
4380	>	* nothing if the key is not in the map.
4381	>	*
4382	>	* @param  o the key to be removed from the backing map
4383	>	* @return {@code true} if the backing map contained the specified key
4384	>	* @throws NullPointerException if the specified key is null
4385	>	*/
4386	>	public boolean remove(Object o) { return map.remove(o) != null; }
4387	>
4388	>	/**
4389	>	* @return an iterator over the keys of the backing map
4390	>	*/
4391	>	public Iterator<K> iterator() {
4392	>	Node<K,V>[] t;
4393	>	ConcurrentHashMap<K,V> m = map;
4394	>	int f = (t = m.table) == null ? 0 : t.length;
4395	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4396	>	}
4397	>
4398	>	/**
4399	>	* Adds the specified key to this set view by mapping the key to
4400	>	* the default mapped value in the backing map, if defined.
4401		*
4402	<	* @return an iterator over the keys of this map
4402	>	* @param e key to be added
4403	>	* @return {@code true} if this set changed as a result of the call
4404	>	* @throws NullPointerException if the specified key is null
4405	>	* @throws UnsupportedOperationException if no default mapped value
4406	>	* for additions was provided
4407		*/
4633	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4408		public boolean add(K e) {
4409		V v;
4410		if ((v = value) == null)
4411		throw new UnsupportedOperationException();
4412	<	if (e == null)
4639	<	throw new NullPointerException();
4640	<	return map.internalPut(e, v, true) == null;
4412	>	return map.putVal(e, v, true) == null;
4413		}
4414	+
4415	+	/**
4416	+	* Adds all of the elements in the specified collection to this set,
4417	+	* as if by calling {@link #add} on each one.
4418	+	*
4419	+	* @param c the elements to be inserted into this set
4420	+	* @return {@code true} if this set changed as a result of the call
4421	+	* @throws NullPointerException if the collection or any of its
4422	+	* elements are {@code null}
4423	+	* @throws UnsupportedOperationException if no default mapped value
4424	+	* for additions was provided
4425	+	*/
4426		public boolean addAll(Collection<? extends K> c) {
4427		boolean added = false;
4428		V v;
4429		if ((v = value) == null)
4430		throw new UnsupportedOperationException();
4431		for (K e : c) {
4432	<	if (e == null)
4649	<	throw new NullPointerException();
4650	<	if (map.internalPut(e, v, true) == null)
4432	>	if (map.putVal(e, v, true) == null)
4433		added = true;
4434		}
4435		return added;
4436		}
4437	+
4438	+	public int hashCode() {
4439	+	int h = 0;
4440	+	for (K e : this)
4441	+	h += e.hashCode();
4442	+	return h;
4443	+	}
4444	+
4445		public boolean equals(Object o) {
4446		Set<?> c;
4447		return ((o instanceof Set) &&
#	Line 4659 | Line 4449 | public class ConcurrentHashMap<K, V>
4449		(containsAll(c) && c.containsAll(this))));
4450		}
4451
4452	<	public Stream<K> stream() {
4453	<	return Streams.stream(() -> new KeyIterator<K,V>(map), 0);
4452	>	public Spliterator<K> spliterator() {
4453	>	Node<K,V>[] t;
4454	>	ConcurrentHashMap<K,V> m = map;
4455	>	long n = m.sumCount();
4456	>	int f = (t = m.table) == null ? 0 : t.length;
4457	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4458		}
4459	<	public Stream<K> parallelStream() {
4460	<	return Streams.parallelStream(() -> new KeyIterator<K,V>(map, null),
4461	<	0);
4459	>
4460	>	public void forEach(Consumer<? super K> action) {
4461	>	if (action == null) throw new NullPointerException();
4462	>	Node<K,V>[] t;
4463	>	if ((t = map.table) != null) {
4464	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4465	>	for (Node<K,V> p; (p = it.advance()) != null; )
4466	>	action.accept(p.key);
4467	>	}
4468		}
4469		}
4470
4471		/**
4472		* A view of a ConcurrentHashMap as a {@link Collection} of
4473		* values, in which additions are disabled. This class cannot be
4474	<	* directly instantiated. See {@link #values},
4675	<	*
4676	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4677	<	* that will never throw {@link ConcurrentModificationException},
4678	<	* and guarantees to traverse elements as they existed upon
4679	<	* construction of the iterator, and may (but is not guaranteed to)
4680	<	* reflect any modifications subsequent to construction.
4474	>	* directly instantiated. See {@link #values()}.
4475		*/
4476	<	public static final class ValuesView<K,V> extends CHMView<K,V>
4477	<	implements Collection<V> {
4476	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4477	>	implements Collection<V>, java.io.Serializable {
4478		private static final long serialVersionUID = 2249069246763182397L;
4479	<	ValuesView(ConcurrentHashMap<K, V> map)   { super(map); }
4480	<	public final boolean contains(Object o) { return map.containsValue(o); }
4479	>	ValuesView(ConcurrentHashMap<K,V> map) { super(map); }
4480	>	public final boolean contains(Object o) {
4481	>	return map.containsValue(o);
4482	>	}
4483	>
4484		public final boolean remove(Object o) {
4485		if (o != null) {
4486	<	Iterator<V> it = new ValueIterator<K,V>(map);
4690	<	while (it.hasNext()) {
4486	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4487		if (o.equals(it.next())) {
4488		it.remove();
4489		return true;
#	Line 4697 | Line 4493 | public class ConcurrentHashMap<K, V>
4493		return false;
4494		}
4495
4700	–	/**
4701	–	* Returns a "weakly consistent" iterator that will never
4702	–	* throw {@link ConcurrentModificationException}, and
4703	–	* guarantees to traverse elements as they existed upon
4704	–	* construction of the iterator, and may (but is not
4705	–	* guaranteed to) reflect any modifications subsequent to
4706	–	* construction.
4707	–	*
4708	–	* @return an iterator over the values of this map
4709	–	*/
4496		public final Iterator<V> iterator() {
4497	<	return new ValueIterator<K,V>(map);
4497	>	ConcurrentHashMap<K,V> m = map;
4498	>	Node<K,V>[] t;
4499	>	int f = (t = m.table) == null ? 0 : t.length;
4500	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4501		}
4502	+
4503		public final boolean add(V e) {
4504		throw new UnsupportedOperationException();
4505		}
#	Line 4717 | Line 4507 | public class ConcurrentHashMap<K, V>
4507		throw new UnsupportedOperationException();
4508		}
4509
4510	<	public Stream<V> stream() {
4511	<	return Streams.stream(() -> new ValueIterator<K,V>(map), 0);
4510	>	public Spliterator<V> spliterator() {
4511	>	Node<K,V>[] t;
4512	>	ConcurrentHashMap<K,V> m = map;
4513	>	long n = m.sumCount();
4514	>	int f = (t = m.table) == null ? 0 : t.length;
4515	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4516		}
4517
4518	<	public Stream<V> parallelStream() {
4519	<	return Streams.parallelStream(() -> new ValueIterator<K,V>(map, null),
4520	<	0);
4518	>	public void forEach(Consumer<? super V> action) {
4519	>	if (action == null) throw new NullPointerException();
4520	>	Node<K,V>[] t;
4521	>	if ((t = map.table) != null) {
4522	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4523	>	for (Node<K,V> p; (p = it.advance()) != null; )
4524	>	action.accept(p.val);
4525	>	}
4526		}
4728	–
4527		}
4528
4529		/**
4530		* A view of a ConcurrentHashMap as a {@link Set} of (key, value)
4531		* entries.  This class cannot be directly instantiated. See
4532	<	* {@link #entrySet}.
4532	>	* {@link #entrySet()}.
4533		*/
4534	<	public static final class EntrySetView<K,V> extends CHMView<K,V>
4535	<	implements Set<Map.Entry<K,V>> {
4534	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4535	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4536		private static final long serialVersionUID = 2249069246763182397L;
4537	<	EntrySetView(ConcurrentHashMap<K, V> map) { super(map); }
4538	<	public final boolean contains(Object o) {
4537	>	EntrySetView(ConcurrentHashMap<K,V> map) { super(map); }
4538	>
4539	>	public boolean contains(Object o) {
4540		Object k, v, r; Map.Entry<?,?> e;
4541		return ((o instanceof Map.Entry) &&
4542		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4745 | Line 4544 | public class ConcurrentHashMap<K, V>
4544		(v = e.getValue()) != null &&
4545		(v == r || v.equals(r)));
4546		}
4547	<	public final boolean remove(Object o) {
4547	>
4548	>	public boolean remove(Object o) {
4549		Object k, v; Map.Entry<?,?> e;
4550		return ((o instanceof Map.Entry) &&
4551		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4754 | Line 4554 | public class ConcurrentHashMap<K, V>
4554		}
4555
4556		/**
4557	<	* Returns a "weakly consistent" iterator that will never
4758	<	* throw {@link ConcurrentModificationException}, and
4759	<	* guarantees to traverse elements as they existed upon
4760	<	* construction of the iterator, and may (but is not
4761	<	* guaranteed to) reflect any modifications subsequent to
4762	<	* construction.
4763	<	*
4764	<	* @return an iterator over the entries of this map
4557	>	* @return an iterator over the entries of the backing map
4558		*/
4559	<	public final Iterator<Map.Entry<K,V>> iterator() {
4560	<	return new EntryIterator<K,V>(map);
4559	>	public Iterator<Map.Entry<K,V>> iterator() {
4560	>	ConcurrentHashMap<K,V> m = map;
4561	>	Node<K,V>[] t;
4562	>	int f = (t = m.table) == null ? 0 : t.length;
4563	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4564		}
4565
4566	<	public final boolean add(Entry<K,V> e) {
4567	<	K key = e.getKey();
4772	<	V value = e.getValue();
4773	<	if (key == null || value == null)
4774	<	throw new NullPointerException();
4775	<	return map.internalPut(key, value, false) == null;
4566	>	public boolean add(Entry<K,V> e) {
4567	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4568		}
4569	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4569	>
4570	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4571		boolean added = false;
4572		for (Entry<K,V> e : c) {
4573		if (add(e))
#	Line 4782 | Line 4575 | public class ConcurrentHashMap<K, V>
4575		}
4576		return added;
4577		}
4578	<	public boolean equals(Object o) {
4578	>
4579	>	public final int hashCode() {
4580	>	int h = 0;
4581	>	Node<K,V>[] t;
4582	>	if ((t = map.table) != null) {
4583	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4584	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4585	>	h += p.hashCode();
4586	>	}
4587	>	}
4588	>	return h;
4589	>	}
4590	>
4591	>	public final boolean equals(Object o) {
4592		Set<?> c;
4593		return ((o instanceof Set) &&
4594		((c = (Set<?>)o) == this ||
4595		(containsAll(c) && c.containsAll(this))));
4596		}
4597
4598	<	public Stream<Map.Entry<K,V>> stream() {
4599	<	return Streams.stream(() -> new EntryIterator<K,V>(map), 0);
4598	>	public Spliterator<Map.Entry<K,V>> spliterator() {
4599	>	Node<K,V>[] t;
4600	>	ConcurrentHashMap<K,V> m = map;
4601	>	long n = m.sumCount();
4602	>	int f = (t = m.table) == null ? 0 : t.length;
4603	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4604		}
4605
4606	<	public Stream<Map.Entry<K,V>> parallelStream() {
4607	<	return Streams.parallelStream(() -> new EntryIterator<K,V>(map, null),
4608	<	0);
4606	>	public void forEach(Consumer<? super Map.Entry<K,V>> action) {
4607	>	if (action == null) throw new NullPointerException();
4608	>	Node<K,V>[] t;
4609	>	if ((t = map.table) != null) {
4610	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4611	>	for (Node<K,V> p; (p = it.advance()) != null; )
4612	>	action.accept(new MapEntry<K,V>(p.key, p.val, map));
4613	>	}
4614		}
4615	+
4616		}
4617
4618	<	// ---------------------------------------------------------------------
4618	>	// -------------------------------------------------------
4619
4620		/**
4621	<	* Predefined tasks for performing bulk parallel operations on
4622	<	* ConcurrentHashMaps. These tasks follow the forms and rules used
4807	<	* for bulk operations. Each method has the same name, but returns
4808	<	* a task rather than invoking it. These methods may be useful in
4809	<	* custom applications such as submitting a task without waiting
4810	<	* for completion, using a custom pool, or combining with other
4811	<	* tasks.
4621	>	* Base class for bulk tasks. Repeats some fields and code from
4622	>	* class Traverser, because we need to subclass CountedCompleter.
4623		*/
4624	<	public static class ForkJoinTasks {
4625	<	private ForkJoinTasks() {}
4626	<
4627	<	/**
4628	<	* Returns a task that when invoked, performs the given
4629	<	* action for each (key, value)
4630	<	*
4631	<	* @param map the map
4632	<	* @param action the action
4633	<	* @return the task
4634	<	*/
4635	<	public static <K,V> ForkJoinTask<Void> forEach
4636	<	(ConcurrentHashMap<K,V> map,
4637	<	BiConsumer<? super K, ? super V> action) {
4638	<	if (action == null) throw new NullPointerException();
4639	<	return new ForEachMappingTask<K,V>(map, null, -1, action);
4640	<	}
4641	<
4642	<	/**
4643	<	* Returns a task that when invoked, performs the given
4644	<	* action for each non-null transformation of each (key, value)
4834	<	*
4835	<	* @param map the map
4836	<	* @param transformer a function returning the transformation
4837	<	* for an element, or null if there is no transformation (in
4838	<	* which case the action is not applied)
4839	<	* @param action the action
4840	<	* @return the task
4841	<	*/
4842	<	public static <K,V,U> ForkJoinTask<Void> forEach
4843	<	(ConcurrentHashMap<K,V> map,
4844	<	BiFunction<? super K, ? super V, ? extends U> transformer,
4845	<	Consumer<? super U> action) {
4846	<	if (transformer == null || action == null)
4847	<	throw new NullPointerException();
4848	<	return new ForEachTransformedMappingTask<K,V,U>
4849	<	(map, null, -1, transformer, action);
4850	<	}
4851	<
4852	<	/**
4853	<	* Returns a task that when invoked, returns a non-null result
4854	<	* from applying the given search function on each (key,
4855	<	* value), or null if none. Upon success, further element
4856	<	* processing is suppressed and the results of any other
4857	<	* parallel invocations of the search function are ignored.
4858	<	*
4859	<	* @param map the map
4860	<	* @param searchFunction a function returning a non-null
4861	<	* result on success, else null
4862	<	* @return the task
4863	<	*/
4864	<	public static <K,V,U> ForkJoinTask<U> search
4865	<	(ConcurrentHashMap<K,V> map,
4866	<	BiFunction<? super K, ? super V, ? extends U> searchFunction) {
4867	<	if (searchFunction == null) throw new NullPointerException();
4868	<	return new SearchMappingsTask<K,V,U>
4869	<	(map, null, -1, searchFunction,
4870	<	new AtomicReference<U>());
4871	<	}
4872	<
4873	<	/**
4874	<	* Returns a task that when invoked, returns the result of
4875	<	* accumulating the given transformation of all (key, value) pairs
4876	<	* using the given reducer to combine values, or null if none.
4877	<	*
4878	<	* @param map the map
4879	<	* @param transformer a function returning the transformation
4880	<	* for an element, or null if there is no transformation (in
4881	<	* which case it is not combined)
4882	<	* @param reducer a commutative associative combining function
4883	<	* @return the task
4884	<	*/
4885	<	public static <K,V,U> ForkJoinTask<U> reduce
4886	<	(ConcurrentHashMap<K,V> map,
4887	<	BiFunction<? super K, ? super V, ? extends U> transformer,
4888	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
4889	<	if (transformer == null || reducer == null)
4890	<	throw new NullPointerException();
4891	<	return new MapReduceMappingsTask<K,V,U>
4892	<	(map, null, -1, null, transformer, reducer);
4893	<	}
4894	<
4895	<	/**
4896	<	* Returns a task that when invoked, returns the result of
4897	<	* accumulating the given transformation of all (key, value) pairs
4898	<	* using the given reducer to combine values, and the given
4899	<	* basis as an identity value.
4900	<	*
4901	<	* @param map the map
4902	<	* @param transformer a function returning the transformation
4903	<	* for an element
4904	<	* @param basis the identity (initial default value) for the reduction
4905	<	* @param reducer a commutative associative combining function
4906	<	* @return the task
4907	<	*/
4908	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4909	<	(ConcurrentHashMap<K,V> map,
4910	<	ToDoubleBiFunction<? super K, ? super V> transformer,
4911	<	double basis,
4912	<	DoubleBinaryOperator reducer) {
4913	<	if (transformer == null || reducer == null)
4914	<	throw new NullPointerException();
4915	<	return new MapReduceMappingsToDoubleTask<K,V>
4916	<	(map, null, -1, null, transformer, basis, reducer);
4917	<	}
4918	<
4919	<	/**
4920	<	* Returns a task that when invoked, returns the result of
4921	<	* accumulating the given transformation of all (key, value) pairs
4922	<	* using the given reducer to combine values, and the given
4923	<	* basis as an identity value.
4924	<	*
4925	<	* @param map the map
4926	<	* @param transformer a function returning the transformation
4927	<	* for an element
4928	<	* @param basis the identity (initial default value) for the reduction
4929	<	* @param reducer a commutative associative combining function
4930	<	* @return the task
4931	<	*/
4932	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4933	<	(ConcurrentHashMap<K,V> map,
4934	<	ToLongBiFunction<? super K, ? super V> transformer,
4935	<	long basis,
4936	<	LongBinaryOperator reducer) {
4937	<	if (transformer == null || reducer == null)
4938	<	throw new NullPointerException();
4939	<	return new MapReduceMappingsToLongTask<K,V>
4940	<	(map, null, -1, null, transformer, basis, reducer);
4941	<	}
4942	<
4943	<	/**
4944	<	* Returns a task that when invoked, returns the result of
4945	<	* accumulating the given transformation of all (key, value) pairs
4946	<	* using the given reducer to combine values, and the given
4947	<	* basis as an identity value.
4948	<	*
4949	<	* @param transformer a function returning the transformation
4950	<	* for an element
4951	<	* @param basis the identity (initial default value) for the reduction
4952	<	* @param reducer a commutative associative combining function
4953	<	* @return the task
4954	<	*/
4955	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4956	<	(ConcurrentHashMap<K,V> map,
4957	<	ToIntBiFunction<? super K, ? super V> transformer,
4958	<	int basis,
4959	<	IntBinaryOperator reducer) {
4960	<	if (transformer == null || reducer == null)
4961	<	throw new NullPointerException();
4962	<	return new MapReduceMappingsToIntTask<K,V>
4963	<	(map, null, -1, null, transformer, basis, reducer);
4964	<	}
4965	<
4966	<	/**
4967	<	* Returns a task that when invoked, performs the given action
4968	<	* for each key.
4969	<	*
4970	<	* @param map the map
4971	<	* @param action the action
4972	<	* @return the task
4973	<	*/
4974	<	public static <K,V> ForkJoinTask<Void> forEachKey
4975	<	(ConcurrentHashMap<K,V> map,
4976	<	Consumer<? super K> action) {
4977	<	if (action == null) throw new NullPointerException();
4978	<	return new ForEachKeyTask<K,V>(map, null, -1, action);
4979	<	}
4980	<
4981	<	/**
4982	<	* Returns a task that when invoked, performs the given action
4983	<	* for each non-null transformation of each key.
4984	<	*
4985	<	* @param map the map
4986	<	* @param transformer a function returning the transformation
4987	<	* for an element, or null if there is no transformation (in
4988	<	* which case the action is not applied)
4989	<	* @param action the action
4990	<	* @return the task
4991	<	*/
4992	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4993	<	(ConcurrentHashMap<K,V> map,
4994	<	Function<? super K, ? extends U> transformer,
4995	<	Consumer<? super U> action) {
4996	<	if (transformer == null || action == null)
4997	<	throw new NullPointerException();
4998	<	return new ForEachTransformedKeyTask<K,V,U>
4999	<	(map, null, -1, transformer, action);
5000	<	}
5001	<
5002	<	/**
5003	<	* Returns a task that when invoked, returns a non-null result
5004	<	* from applying the given search function on each key, or
5005	<	* null if none.  Upon success, further element processing is
5006	<	* suppressed and the results of any other parallel
5007	<	* invocations of the search function are ignored.
5008	<	*
5009	<	* @param map the map
5010	<	* @param searchFunction a function returning a non-null
5011	<	* result on success, else null
5012	<	* @return the task
5013	<	*/
5014	<	public static <K,V,U> ForkJoinTask<U> searchKeys
5015	<	(ConcurrentHashMap<K,V> map,
5016	<	Function<? super K, ? extends U> searchFunction) {
5017	<	if (searchFunction == null) throw new NullPointerException();
5018	<	return new SearchKeysTask<K,V,U>
5019	<	(map, null, -1, searchFunction,
5020	<	new AtomicReference<U>());
5021	<	}
5022	<
5023	<	/**
5024	<	* Returns a task that when invoked, returns the result of
5025	<	* accumulating all keys using the given reducer to combine
5026	<	* values, or null if none.
5027	<	*
5028	<	* @param map the map
5029	<	* @param reducer a commutative associative combining function
5030	<	* @return the task
5031	<	*/
5032	<	public static <K,V> ForkJoinTask<K> reduceKeys
5033	<	(ConcurrentHashMap<K,V> map,
5034	<	BiFunction<? super K, ? super K, ? extends K> reducer) {
5035	<	if (reducer == null) throw new NullPointerException();
5036	<	return new ReduceKeysTask<K,V>
5037	<	(map, null, -1, null, reducer);
5038	<	}
5039	<
5040	<	/**
5041	<	* Returns a task that when invoked, returns the result of
5042	<	* accumulating the given transformation of all keys using the given
5043	<	* reducer to combine values, or null if none.
5044	<	*
5045	<	* @param map the map
5046	<	* @param transformer a function returning the transformation
5047	<	* for an element, or null if there is no transformation (in
5048	<	* which case it is not combined)
5049	<	* @param reducer a commutative associative combining function
5050	<	* @return the task
5051	<	*/
5052	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
5053	<	(ConcurrentHashMap<K,V> map,
5054	<	Function<? super K, ? extends U> transformer,
5055	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
5056	<	if (transformer == null || reducer == null)
5057	<	throw new NullPointerException();
5058	<	return new MapReduceKeysTask<K,V,U>
5059	<	(map, null, -1, null, transformer, reducer);
5060	<	}
5061	<
5062	<	/**
5063	<	* Returns a task that when invoked, returns the result of
5064	<	* accumulating the given transformation of all keys using the given
5065	<	* reducer to combine values, and the given basis as an
5066	<	* identity value.
5067	<	*
5068	<	* @param map the map
5069	<	* @param transformer a function returning the transformation
5070	<	* for an element
5071	<	* @param basis the identity (initial default value) for the reduction
5072	<	* @param reducer a commutative associative combining function
5073	<	* @return the task
5074	<	*/
5075	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
5076	<	(ConcurrentHashMap<K,V> map,
5077	<	ToDoubleFunction<? super K> transformer,
5078	<	double basis,
5079	<	DoubleBinaryOperator reducer) {
5080	<	if (transformer == null || reducer == null)
5081	<	throw new NullPointerException();
5082	<	return new MapReduceKeysToDoubleTask<K,V>
5083	<	(map, null, -1, null, transformer, basis, reducer);
5084	<	}
5085	<
5086	<	/**
5087	<	* Returns a task that when invoked, returns the result of
5088	<	* accumulating the given transformation of all keys using the given
5089	<	* reducer to combine values, and the given basis as an
5090	<	* identity value.
5091	<	*
5092	<	* @param map the map
5093	<	* @param transformer a function returning the transformation
5094	<	* for an element
5095	<	* @param basis the identity (initial default value) for the reduction
5096	<	* @param reducer a commutative associative combining function
5097	<	* @return the task
5098	<	*/
5099	<	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
5100	<	(ConcurrentHashMap<K,V> map,
5101	<	ToLongFunction<? super K> transformer,
5102	<	long basis,
5103	<	LongBinaryOperator reducer) {
5104	<	if (transformer == null || reducer == null)
5105	<	throw new NullPointerException();
5106	<	return new MapReduceKeysToLongTask<K,V>
5107	<	(map, null, -1, null, transformer, basis, reducer);
5108	<	}
5109	<
5110	<	/**
5111	<	* Returns a task that when invoked, returns the result of
5112	<	* accumulating the given transformation of all keys using the given
5113	<	* reducer to combine values, and the given basis as an
5114	<	* identity value.
5115	<	*
5116	<	* @param map the map
5117	<	* @param transformer a function returning the transformation
5118	<	* for an element
5119	<	* @param basis the identity (initial default value) for the reduction
5120	<	* @param reducer a commutative associative combining function
5121	<	* @return the task
5122	<	*/
5123	<	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
5124	<	(ConcurrentHashMap<K,V> map,
5125	<	ToIntFunction<? super K> transformer,
5126	<	int basis,
5127	<	IntBinaryOperator reducer) {
5128	<	if (transformer == null || reducer == null)
5129	<	throw new NullPointerException();
5130	<	return new MapReduceKeysToIntTask<K,V>
5131	<	(map, null, -1, null, transformer, basis, reducer);
5132	<	}
5133	<
5134	<	/**
5135	<	* Returns a task that when invoked, performs the given action
5136	<	* for each value.
5137	<	*
5138	<	* @param map the map
5139	<	* @param action the action
5140	<	* @return the task
5141	<	*/
5142	<	public static <K,V> ForkJoinTask<Void> forEachValue
5143	<	(ConcurrentHashMap<K,V> map,
5144	<	Consumer<? super V> action) {
5145	<	if (action == null) throw new NullPointerException();
5146	<	return new ForEachValueTask<K,V>(map, null, -1, action);
5147	<	}
5148	<
5149	<	/**
5150	<	* Returns a task that when invoked, performs the given action
5151	<	* for each non-null transformation of each value.
5152	<	*
5153	<	* @param map the map
5154	<	* @param transformer a function returning the transformation
5155	<	* for an element, or null if there is no transformation (in
5156	<	* which case the action is not applied)
5157	<	* @param action the action
5158	<	* @return the task
5159	<	*/
5160	<	public static <K,V,U> ForkJoinTask<Void> forEachValue
5161	<	(ConcurrentHashMap<K,V> map,
5162	<	Function<? super V, ? extends U> transformer,
5163	<	Consumer<? super U> action) {
5164	<	if (transformer == null || action == null)
5165	<	throw new NullPointerException();
5166	<	return new ForEachTransformedValueTask<K,V,U>
5167	<	(map, null, -1, transformer, action);
5168	<	}
5169	<
5170	<	/**
5171	<	* Returns a task that when invoked, returns a non-null result
5172	<	* from applying the given search function on each value, or
5173	<	* null if none.  Upon success, further element processing is
5174	<	* suppressed and the results of any other parallel
5175	<	* invocations of the search function are ignored.
5176	<	*
5177	<	* @param map the map
5178	<	* @param searchFunction a function returning a non-null
5179	<	* result on success, else null
5180	<	* @return the task
5181	<	*/
5182	<	public static <K,V,U> ForkJoinTask<U> searchValues
5183	<	(ConcurrentHashMap<K,V> map,
5184	<	Function<? super V, ? extends U> searchFunction) {
5185	<	if (searchFunction == null) throw new NullPointerException();
5186	<	return new SearchValuesTask<K,V,U>
5187	<	(map, null, -1, searchFunction,
5188	<	new AtomicReference<U>());
5189	<	}
5190	<
5191	<	/**
5192	<	* Returns a task that when invoked, returns the result of
5193	<	* accumulating all values using the given reducer to combine
5194	<	* values, or null if none.
5195	<	*
5196	<	* @param map the map
5197	<	* @param reducer a commutative associative combining function
5198	<	* @return the task
5199	<	*/
5200	<	public static <K,V> ForkJoinTask<V> reduceValues
5201	<	(ConcurrentHashMap<K,V> map,
5202	<	BiFunction<? super V, ? super V, ? extends V> reducer) {
5203	<	if (reducer == null) throw new NullPointerException();
5204	<	return new ReduceValuesTask<K,V>
5205	<	(map, null, -1, null, reducer);
5206	<	}
5207	<
5208	<	/**
5209	<	* Returns a task that when invoked, returns the result of
5210	<	* accumulating the given transformation of all values using the
5211	<	* given reducer to combine values, or null if none.
5212	<	*
5213	<	* @param map the map
5214	<	* @param transformer a function returning the transformation
5215	<	* for an element, or null if there is no transformation (in
5216	<	* which case it is not combined)
5217	<	* @param reducer a commutative associative combining function
5218	<	* @return the task
5219	<	*/
5220	<	public static <K,V,U> ForkJoinTask<U> reduceValues
5221	<	(ConcurrentHashMap<K,V> map,
5222	<	Function<? super V, ? extends U> transformer,
5223	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
5224	<	if (transformer == null || reducer == null)
5225	<	throw new NullPointerException();
5226	<	return new MapReduceValuesTask<K,V,U>
5227	<	(map, null, -1, null, transformer, reducer);
5228	<	}
5229	<
5230	<	/**
5231	<	* Returns a task that when invoked, returns the result of
5232	<	* accumulating the given transformation of all values using the
5233	<	* given reducer to combine values, and the given basis as an
5234	<	* identity value.
5235	<	*
5236	<	* @param map the map
5237	<	* @param transformer a function returning the transformation
5238	<	* for an element
5239	<	* @param basis the identity (initial default value) for the reduction
5240	<	* @param reducer a commutative associative combining function
5241	<	* @return the task
5242	<	*/
5243	<	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
5244	<	(ConcurrentHashMap<K,V> map,
5245	<	ToDoubleFunction<? super V> transformer,
5246	<	double basis,
5247	<	DoubleBinaryOperator reducer) {
5248	<	if (transformer == null || reducer == null)
5249	<	throw new NullPointerException();
5250	<	return new MapReduceValuesToDoubleTask<K,V>
5251	<	(map, null, -1, null, transformer, basis, reducer);
5252	<	}
5253	<
5254	<	/**
5255	<	* Returns a task that when invoked, returns the result of
5256	<	* accumulating the given transformation of all values using the
5257	<	* given reducer to combine values, and the given basis as an
5258	<	* identity value.
5259	<	*
5260	<	* @param map the map
5261	<	* @param transformer a function returning the transformation
5262	<	* for an element
5263	<	* @param basis the identity (initial default value) for the reduction
5264	<	* @param reducer a commutative associative combining function
5265	<	* @return the task
5266	<	*/
5267	<	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
5268	<	(ConcurrentHashMap<K,V> map,
5269	<	ToLongFunction<? super V> transformer,
5270	<	long basis,
5271	<	LongBinaryOperator reducer) {
5272	<	if (transformer == null || reducer == null)
5273	<	throw new NullPointerException();
5274	<	return new MapReduceValuesToLongTask<K,V>
5275	<	(map, null, -1, null, transformer, basis, reducer);
5276	<	}
5277	<
5278	<	/**
5279	<	* Returns a task that when invoked, returns the result of
5280	<	* accumulating the given transformation of all values using the
5281	<	* given reducer to combine values, and the given basis as an
5282	<	* identity value.
5283	<	*
5284	<	* @param map the map
5285	<	* @param transformer a function returning the transformation
5286	<	* for an element
5287	<	* @param basis the identity (initial default value) for the reduction
5288	<	* @param reducer a commutative associative combining function
5289	<	* @return the task
5290	<	*/
5291	<	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
5292	<	(ConcurrentHashMap<K,V> map,
5293	<	ToIntFunction<? super V> transformer,
5294	<	int basis,
5295	<	IntBinaryOperator reducer) {
5296	<	if (transformer == null || reducer == null)
5297	<	throw new NullPointerException();
5298	<	return new MapReduceValuesToIntTask<K,V>
5299	<	(map, null, -1, null, transformer, basis, reducer);
5300	<	}
5301	<
5302	<	/**
5303	<	* Returns a task that when invoked, perform the given action
5304	<	* for each entry.
5305	<	*
5306	<	* @param map the map
5307	<	* @param action the action
5308	<	* @return the task
5309	<	*/
5310	<	public static <K,V> ForkJoinTask<Void> forEachEntry
5311	<	(ConcurrentHashMap<K,V> map,
5312	<	Consumer<? super Map.Entry<K,V>> action) {
5313	<	if (action == null) throw new NullPointerException();
5314	<	return new ForEachEntryTask<K,V>(map, null, -1, action);
5315	<	}
5316	<
5317	<	/**
5318	<	* Returns a task that when invoked, perform the given action
5319	<	* for each non-null transformation of each entry.
5320	<	*
5321	<	* @param map the map
5322	<	* @param transformer a function returning the transformation
5323	<	* for an element, or null if there is no transformation (in
5324	<	* which case the action is not applied)
5325	<	* @param action the action
5326	<	* @return the task
5327	<	*/
5328	<	public static <K,V,U> ForkJoinTask<Void> forEachEntry
5329	<	(ConcurrentHashMap<K,V> map,
5330	<	Function<Map.Entry<K,V>, ? extends U> transformer,
5331	<	Consumer<? super U> action) {
5332	<	if (transformer == null || action == null)
5333	<	throw new NullPointerException();
5334	<	return new ForEachTransformedEntryTask<K,V,U>
5335	<	(map, null, -1, transformer, action);
5336	<	}
5337	<
5338	<	/**
5339	<	* Returns a task that when invoked, returns a non-null result
5340	<	* from applying the given search function on each entry, or
5341	<	* null if none.  Upon success, further element processing is
5342	<	* suppressed and the results of any other parallel
5343	<	* invocations of the search function are ignored.
5344	<	*
5345	<	* @param map the map
5346	<	* @param searchFunction a function returning a non-null
5347	<	* result on success, else null
5348	<	* @return the task
5349	<	*/
5350	<	public static <K,V,U> ForkJoinTask<U> searchEntries
5351	<	(ConcurrentHashMap<K,V> map,
5352	<	Function<Map.Entry<K,V>, ? extends U> searchFunction) {
5353	<	if (searchFunction == null) throw new NullPointerException();
5354	<	return new SearchEntriesTask<K,V,U>
5355	<	(map, null, -1, searchFunction,
5356	<	new AtomicReference<U>());
5357	<	}
5358	<
5359	<	/**
5360	<	* Returns a task that when invoked, returns the result of
5361	<	* accumulating all entries using the given reducer to combine
5362	<	* values, or null if none.
5363	<	*
5364	<	* @param map the map
5365	<	* @param reducer a commutative associative combining function
5366	<	* @return the task
5367	<	*/
5368	<	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
5369	<	(ConcurrentHashMap<K,V> map,
5370	<	BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5371	<	if (reducer == null) throw new NullPointerException();
5372	<	return new ReduceEntriesTask<K,V>
5373	<	(map, null, -1, null, reducer);
5374	<	}
5375	<
5376	<	/**
5377	<	* Returns a task that when invoked, returns the result of
5378	<	* accumulating the given transformation of all entries using the
5379	<	* given reducer to combine values, or null if none.
5380	<	*
5381	<	* @param map the map
5382	<	* @param transformer a function returning the transformation
5383	<	* for an element, or null if there is no transformation (in
5384	<	* which case it is not combined)
5385	<	* @param reducer a commutative associative combining function
5386	<	* @return the task
5387	<	*/
5388	<	public static <K,V,U> ForkJoinTask<U> reduceEntries
5389	<	(ConcurrentHashMap<K,V> map,
5390	<	Function<Map.Entry<K,V>, ? extends U> transformer,
5391	<	BiFunction<? super U, ? super U, ? extends U> reducer) {
5392	<	if (transformer == null || reducer == null)
5393	<	throw new NullPointerException();
5394	<	return new MapReduceEntriesTask<K,V,U>
5395	<	(map, null, -1, null, transformer, reducer);
5396	<	}
5397	<
5398	<	/**
5399	<	* Returns a task that when invoked, returns the result of
5400	<	* accumulating the given transformation of all entries using the
5401	<	* given reducer to combine values, and the given basis as an
5402	<	* identity value.
5403	<	*
5404	<	* @param map the map
5405	<	* @param transformer a function returning the transformation
5406	<	* for an element
5407	<	* @param basis the identity (initial default value) for the reduction
5408	<	* @param reducer a commutative associative combining function
5409	<	* @return the task
5410	<	*/
5411	<	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
5412	<	(ConcurrentHashMap<K,V> map,
5413	<	ToDoubleFunction<Map.Entry<K,V>> transformer,
5414	<	double basis,
5415	<	DoubleBinaryOperator reducer) {
5416	<	if (transformer == null || reducer == null)
5417	<	throw new NullPointerException();
5418	<	return new MapReduceEntriesToDoubleTask<K,V>
5419	<	(map, null, -1, null, transformer, basis, reducer);
5420	<	}
5421	<
5422	<	/**
5423	<	* Returns a task that when invoked, returns the result of
5424	<	* accumulating the given transformation of all entries using the
5425	<	* given reducer to combine values, and the given basis as an
5426	<	* identity value.
5427	<	*
5428	<	* @param map the map
5429	<	* @param transformer a function returning the transformation
5430	<	* for an element
5431	<	* @param basis the identity (initial default value) for the reduction
5432	<	* @param reducer a commutative associative combining function
5433	<	* @return the task
5434	<	*/
5435	<	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
5436	<	(ConcurrentHashMap<K,V> map,
5437	<	ToLongFunction<Map.Entry<K,V>> transformer,
5438	<	long basis,
5439	<	LongBinaryOperator reducer) {
5440	<	if (transformer == null || reducer == null)
5441	<	throw new NullPointerException();
5442	<	return new MapReduceEntriesToLongTask<K,V>
5443	<	(map, null, -1, null, transformer, basis, reducer);
4624	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4625	>	Node<K,V>[] tab;        // same as Traverser
4626	>	Node<K,V> next;
4627	>	int index;
4628	>	int baseIndex;
4629	>	int baseLimit;
4630	>	final int baseSize;
4631	>	int batch;              // split control
4632	>
4633	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4634	>	super(par);
4635	>	this.batch = b;
4636	>	this.index = this.baseIndex = i;
4637	>	if ((this.tab = t) == null)
4638	>	this.baseSize = this.baseLimit = 0;
4639	>	else if (par == null)
4640	>	this.baseSize = this.baseLimit = t.length;
4641	>	else {
4642	>	this.baseLimit = f;
4643	>	this.baseSize = par.baseSize;
4644	>	}
4645		}
4646
4647		/**
4648	<	* Returns a task that when invoked, returns the result of
5448	<	* accumulating the given transformation of all entries using the
5449	<	* given reducer to combine values, and the given basis as an
5450	<	* identity value.
5451	<	*
5452	<	* @param map the map
5453	<	* @param transformer a function returning the transformation
5454	<	* for an element
5455	<	* @param basis the identity (initial default value) for the reduction
5456	<	* @param reducer a commutative associative combining function
5457	<	* @return the task
4648	>	* Same as Traverser version
4649		*/
4650	<	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
4651	<	(ConcurrentHashMap<K,V> map,
4652	<	ToIntFunction<Map.Entry<K,V>> transformer,
4653	<	int basis,
4654	<	IntBinaryOperator reducer) {
4655	<	if (transformer == null || reducer == null)
4656	<	throw new NullPointerException();
4657	<	return new MapReduceEntriesToIntTask<K,V>
4658	<	(map, null, -1, null, transformer, basis, reducer);
4650	>	final Node<K,V> advance() {
4651	>	Node<K,V> e;
4652	>	if ((e = next) != null)
4653	>	e = e.next;
4654	>	for (;;) {
4655	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4656	>	if (e != null)
4657	>	return next = e;
4658	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4659	>	(n = t.length) <= (i = index) || i < 0)
4660	>	return next = null;
4661	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4662	>	if (e instanceof ForwardingNode) {
4663	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4664	>	e = null;
4665	>	continue;
4666	>	}
4667	>	else if (e instanceof TreeBin)
4668	>	e = ((TreeBin<K,V>)e).first;
4669	>	else
4670	>	e = null;
4671	>	}
4672	>	if ((index += baseSize) >= n)
4673	>	index = ++baseIndex;    // visit upper slots if present
4674	>	}
4675		}
4676		}
4677
5471	–	// -------------------------------------------------------
5472	–
4678		/*
4679		* Task classes. Coded in a regular but ugly format/style to
4680		* simplify checks that each variant differs in the right way from
#	Line 5477 | Line 4682 | public class ConcurrentHashMap<K, V>
4682		* that we've already null-checked task arguments, so we force
4683		* simplest hoisted bypass to help avoid convoluted traps.
4684		*/
4685	<
4686	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4687	<	extends Traverser<K,V,Void> {
4685	>	@SuppressWarnings("serial")
4686	>	static final class ForEachKeyTask<K,V>
4687	>	extends BulkTask<K,V,Void> {
4688		final Consumer<? super K> action;
4689		ForEachKeyTask
4690	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
4690	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4691		Consumer<? super K> action) {
4692	<	super(m, p, b);
4692	>	super(p, b, i, f, t);
4693		this.action = action;
4694		}
4695		public final void compute() {
4696		final Consumer<? super K> action;
4697		if ((action = this.action) != null) {
4698	<	for (int b; (b = preSplit()) > 0;)
4699	<	new ForEachKeyTask<K,V>(map, this, b, action).fork();
4700	<	while (advance() != null)
4701	<	action.accept(nextKey);
4698	>	for (int i = baseIndex, f, h; batch > 0 &&
4699	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4700	>	addToPendingCount(1);
4701	>	new ForEachKeyTask<K,V>
4702	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4703	>	action).fork();
4704	>	}
4705	>	for (Node<K,V> p; (p = advance()) != null;)
4706	>	action.accept(p.key);
4707		propagateCompletion();
4708		}
4709		}
4710		}
4711
4712	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4713	<	extends Traverser<K,V,Void> {
4712	>	@SuppressWarnings("serial")
4713	>	static final class ForEachValueTask<K,V>
4714	>	extends BulkTask<K,V,Void> {
4715		final Consumer<? super V> action;
4716		ForEachValueTask
4717	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
4717	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4718		Consumer<? super V> action) {
4719	<	super(m, p, b);
4719	>	super(p, b, i, f, t);
4720		this.action = action;
4721		}
4722		public final void compute() {
4723		final Consumer<? super V> action;
4724		if ((action = this.action) != null) {
4725	<	for (int b; (b = preSplit()) > 0;)
4726	<	new ForEachValueTask<K,V>(map, this, b, action).fork();
4727	<	V v;
4728	<	while ((v = advance()) != null)
4729	<	action.accept(v);
4725	>	for (int i = baseIndex, f, h; batch > 0 &&
4726	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4727	>	addToPendingCount(1);
4728	>	new ForEachValueTask<K,V>
4729	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4730	>	action).fork();
4731	>	}
4732	>	for (Node<K,V> p; (p = advance()) != null;)
4733	>	action.accept(p.val);
4734		propagateCompletion();
4735		}
4736		}
4737		}
4738
4739	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4740	<	extends Traverser<K,V,Void> {
4739	>	@SuppressWarnings("serial")
4740	>	static final class ForEachEntryTask<K,V>
4741	>	extends BulkTask<K,V,Void> {
4742		final Consumer<? super Entry<K,V>> action;
4743		ForEachEntryTask
4744	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
4744	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4745		Consumer<? super Entry<K,V>> action) {
4746	<	super(m, p, b);
4746	>	super(p, b, i, f, t);
4747		this.action = action;
4748		}
4749		public final void compute() {
4750		final Consumer<? super Entry<K,V>> action;
4751		if ((action = this.action) != null) {
4752	<	for (int b; (b = preSplit()) > 0;)
4753	<	new ForEachEntryTask<K,V>(map, this, b, action).fork();
4754	<	V v;
4755	<	while ((v = advance()) != null)
4756	<	action.accept(entryFor(nextKey, v));
4752	>	for (int i = baseIndex, f, h; batch > 0 &&
4753	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4754	>	addToPendingCount(1);
4755	>	new ForEachEntryTask<K,V>
4756	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4757	>	action).fork();
4758	>	}
4759	>	for (Node<K,V> p; (p = advance()) != null; )
4760	>	action.accept(p);
4761		propagateCompletion();
4762		}
4763		}
4764		}
4765
4766	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4767	<	extends Traverser<K,V,Void> {
4766	>	@SuppressWarnings("serial")
4767	>	static final class ForEachMappingTask<K,V>
4768	>	extends BulkTask<K,V,Void> {
4769		final BiConsumer<? super K, ? super V> action;
4770		ForEachMappingTask
4771	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
4771	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4772		BiConsumer<? super K,? super V> action) {
4773	<	super(m, p, b);
4773	>	super(p, b, i, f, t);
4774		this.action = action;
4775		}
4776		public final void compute() {
4777		final BiConsumer<? super K, ? super V> action;
4778		if ((action = this.action) != null) {
4779	<	for (int b; (b = preSplit()) > 0;)
4780	<	new ForEachMappingTask<K,V>(map, this, b, action).fork();
4781	<	V v;
4782	<	while ((v = advance()) != null)
4783	<	action.accept(nextKey, v);
4779	>	for (int i = baseIndex, f, h; batch > 0 &&
4780	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4781	>	addToPendingCount(1);
4782	>	new ForEachMappingTask<K,V>
4783	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4784	>	action).fork();
4785	>	}
4786	>	for (Node<K,V> p; (p = advance()) != null; )
4787	>	action.accept(p.key, p.val);
4788		propagateCompletion();
4789		}
4790		}
4791		}
4792
4793	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4794	<	extends Traverser<K,V,Void> {
4793	>	@SuppressWarnings("serial")
4794	>	static final class ForEachTransformedKeyTask<K,V,U>
4795	>	extends BulkTask<K,V,Void> {
4796		final Function<? super K, ? extends U> transformer;
4797		final Consumer<? super U> action;
4798		ForEachTransformedKeyTask
4799	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
4799	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4800		Function<? super K, ? extends U> transformer, Consumer<? super U> action) {
4801	<	super(m, p, b);
4801	>	super(p, b, i, f, t);
4802		this.transformer = transformer; this.action = action;
4803		}
4804		public final void compute() {
#	Line 5580 | Line 4806 | public class ConcurrentHashMap<K, V>
4806		final Consumer<? super U> action;
4807		if ((transformer = this.transformer) != null &&
4808		(action = this.action) != null) {
4809	<	for (int b; (b = preSplit()) > 0;)
4809	>	for (int i = baseIndex, f, h; batch > 0 &&
4810	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4811	>	addToPendingCount(1);
4812		new ForEachTransformedKeyTask<K,V,U>
4813	<	(map, this, b, transformer, action).fork();
4814	<	U u;
4815	<	while (advance() != null) {
4816	<	if ((u = transformer.apply(nextKey)) != null)
4813	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4814	>	transformer, action).fork();
4815	>	}
4816	>	for (Node<K,V> p; (p = advance()) != null; ) {
4817	>	U u;
4818	>	if ((u = transformer.apply(p.key)) != null)
4819		action.accept(u);
4820		}
4821		propagateCompletion();
#	Line 5593 | Line 4823 | public class ConcurrentHashMap<K, V>
4823		}
4824		}
4825
4826	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4827	<	extends Traverser<K,V,Void> {
4826	>	@SuppressWarnings("serial")
4827	>	static final class ForEachTransformedValueTask<K,V,U>
4828	>	extends BulkTask<K,V,Void> {
4829		final Function<? super V, ? extends U> transformer;
4830		final Consumer<? super U> action;
4831		ForEachTransformedValueTask
4832	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
4832	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4833		Function<? super V, ? extends U> transformer, Consumer<? super U> action) {
4834	<	super(m, p, b);
4834	>	super(p, b, i, f, t);
4835		this.transformer = transformer; this.action = action;
4836		}
4837		public final void compute() {
#	Line 5608 | Line 4839 | public class ConcurrentHashMap<K, V>
4839		final Consumer<? super U> action;
4840		if ((transformer = this.transformer) != null &&
4841		(action = this.action) != null) {
4842	<	for (int b; (b = preSplit()) > 0;)
4842	>	for (int i = baseIndex, f, h; batch > 0 &&
4843	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4844	>	addToPendingCount(1);
4845		new ForEachTransformedValueTask<K,V,U>
4846	<	(map, this, b, transformer, action).fork();
4847	<	V v; U u;
4848	<	while ((v = advance()) != null) {
4849	<	if ((u = transformer.apply(v)) != null)
4846	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4847	>	transformer, action).fork();
4848	>	}
4849	>	for (Node<K,V> p; (p = advance()) != null; ) {
4850	>	U u;
4851	>	if ((u = transformer.apply(p.val)) != null)
4852		action.accept(u);
4853		}
4854		propagateCompletion();
#	Line 5621 | Line 4856 | public class ConcurrentHashMap<K, V>
4856		}
4857		}
4858
4859	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4860	<	extends Traverser<K,V,Void> {
4859	>	@SuppressWarnings("serial")
4860	>	static final class ForEachTransformedEntryTask<K,V,U>
4861	>	extends BulkTask<K,V,Void> {
4862		final Function<Map.Entry<K,V>, ? extends U> transformer;
4863		final Consumer<? super U> action;
4864		ForEachTransformedEntryTask
4865	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
4865	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4866		Function<Map.Entry<K,V>, ? extends U> transformer, Consumer<? super U> action) {
4867	<	super(m, p, b);
4867	>	super(p, b, i, f, t);
4868		this.transformer = transformer; this.action = action;
4869		}
4870		public final void compute() {
#	Line 5636 | Line 4872 | public class ConcurrentHashMap<K, V>
4872		final Consumer<? super U> action;
4873		if ((transformer = this.transformer) != null &&
4874		(action = this.action) != null) {
4875	<	for (int b; (b = preSplit()) > 0;)
4875	>	for (int i = baseIndex, f, h; batch > 0 &&
4876	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4877	>	addToPendingCount(1);
4878		new ForEachTransformedEntryTask<K,V,U>
4879	<	(map, this, b, transformer, action).fork();
4880	<	V v; U u;
4881	<	while ((v = advance()) != null) {
4882	<	if ((u = transformer.apply(entryFor(nextKey,
4883	<	v))) != null)
4879	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4880	>	transformer, action).fork();
4881	>	}
4882	>	for (Node<K,V> p; (p = advance()) != null; ) {
4883	>	U u;
4884	>	if ((u = transformer.apply(p)) != null)
4885		action.accept(u);
4886		}
4887		propagateCompletion();
#	Line 5650 | Line 4889 | public class ConcurrentHashMap<K, V>
4889		}
4890		}
4891
4892	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4893	<	extends Traverser<K,V,Void> {
4892	>	@SuppressWarnings("serial")
4893	>	static final class ForEachTransformedMappingTask<K,V,U>
4894	>	extends BulkTask<K,V,Void> {
4895		final BiFunction<? super K, ? super V, ? extends U> transformer;
4896		final Consumer<? super U> action;
4897		ForEachTransformedMappingTask
4898	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
4898	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4899		BiFunction<? super K, ? super V, ? extends U> transformer,
4900		Consumer<? super U> action) {
4901	<	super(m, p, b);
4901	>	super(p, b, i, f, t);
4902		this.transformer = transformer; this.action = action;
4903		}
4904		public final void compute() {
#	Line 5666 | Line 4906 | public class ConcurrentHashMap<K, V>
4906		final Consumer<? super U> action;
4907		if ((transformer = this.transformer) != null &&
4908		(action = this.action) != null) {
4909	<	for (int b; (b = preSplit()) > 0;)
4909	>	for (int i = baseIndex, f, h; batch > 0 &&
4910	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4911	>	addToPendingCount(1);
4912		new ForEachTransformedMappingTask<K,V,U>
4913	<	(map, this, b, transformer, action).fork();
4914	<	V v; U u;
4915	<	while ((v = advance()) != null) {
4916	<	if ((u = transformer.apply(nextKey, v)) != null)
4913	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4914	>	transformer, action).fork();
4915	>	}
4916	>	for (Node<K,V> p; (p = advance()) != null; ) {
4917	>	U u;
4918	>	if ((u = transformer.apply(p.key, p.val)) != null)
4919		action.accept(u);
4920		}
4921		propagateCompletion();
#	Line 5679 | Line 4923 | public class ConcurrentHashMap<K, V>
4923		}
4924		}
4925
4926	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4927	<	extends Traverser<K,V,U> {
4926	>	@SuppressWarnings("serial")
4927	>	static final class SearchKeysTask<K,V,U>
4928	>	extends BulkTask<K,V,U> {
4929		final Function<? super K, ? extends U> searchFunction;
4930		final AtomicReference<U> result;
4931		SearchKeysTask
4932	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
4932	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4933		Function<? super K, ? extends U> searchFunction,
4934		AtomicReference<U> result) {
4935	<	super(m, p, b);
4935	>	super(p, b, i, f, t);
4936		this.searchFunction = searchFunction; this.result = result;
4937		}
4938		public final U getRawResult() { return result.get(); }
#	Line 5696 | Line 4941 | public class ConcurrentHashMap<K, V>
4941		final AtomicReference<U> result;
4942		if ((searchFunction = this.searchFunction) != null &&
4943		(result = this.result) != null) {
4944	<	for (int b;;) {
4944	>	for (int i = baseIndex, f, h; batch > 0 &&
4945	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4946		if (result.get() != null)
4947		return;
4948	<	if ((b = preSplit()) <= 0)
5703	<	break;
4948	>	addToPendingCount(1);
4949		new SearchKeysTask<K,V,U>
4950	<	(map, this, b, searchFunction, result).fork();
4950	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4951	>	searchFunction, result).fork();
4952		}
4953		while (result.get() == null) {
4954		U u;
4955	<	if (advance() == null) {
4955	>	Node<K,V> p;
4956	>	if ((p = advance()) == null) {
4957		propagateCompletion();
4958		break;
4959		}
4960	<	if ((u = searchFunction.apply(nextKey)) != null) {
4960	>	if ((u = searchFunction.apply(p.key)) != null) {
4961		if (result.compareAndSet(null, u))
4962		quietlyCompleteRoot();
4963		break;
#	Line 5720 | Line 4967 | public class ConcurrentHashMap<K, V>
4967		}
4968		}
4969
4970	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
4971	<	extends Traverser<K,V,U> {
4970	>	@SuppressWarnings("serial")
4971	>	static final class SearchValuesTask<K,V,U>
4972	>	extends BulkTask<K,V,U> {
4973		final Function<? super V, ? extends U> searchFunction;
4974		final AtomicReference<U> result;
4975		SearchValuesTask
4976	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
4976	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4977		Function<? super V, ? extends U> searchFunction,
4978		AtomicReference<U> result) {
4979	<	super(m, p, b);
4979	>	super(p, b, i, f, t);
4980		this.searchFunction = searchFunction; this.result = result;
4981		}
4982		public final U getRawResult() { return result.get(); }
#	Line 5737 | Line 4985 | public class ConcurrentHashMap<K, V>
4985		final AtomicReference<U> result;
4986		if ((searchFunction = this.searchFunction) != null &&
4987		(result = this.result) != null) {
4988	<	for (int b;;) {
4988	>	for (int i = baseIndex, f, h; batch > 0 &&
4989	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4990		if (result.get() != null)
4991		return;
4992	<	if ((b = preSplit()) <= 0)
5744	<	break;
4992	>	addToPendingCount(1);
4993		new SearchValuesTask<K,V,U>
4994	<	(map, this, b, searchFunction, result).fork();
4994	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4995	>	searchFunction, result).fork();
4996		}
4997		while (result.get() == null) {
4998	<	V v; U u;
4999	<	if ((v = advance()) == null) {
4998	>	U u;
4999	>	Node<K,V> p;
5000	>	if ((p = advance()) == null) {
5001		propagateCompletion();
5002		break;
5003		}
5004	<	if ((u = searchFunction.apply(v)) != null) {
5004	>	if ((u = searchFunction.apply(p.val)) != null) {
5005		if (result.compareAndSet(null, u))
5006		quietlyCompleteRoot();
5007		break;
#	Line 5761 | Line 5011 | public class ConcurrentHashMap<K, V>
5011		}
5012		}
5013
5014	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5015	<	extends Traverser<K,V,U> {
5014	>	@SuppressWarnings("serial")
5015	>	static final class SearchEntriesTask<K,V,U>
5016	>	extends BulkTask<K,V,U> {
5017		final Function<Entry<K,V>, ? extends U> searchFunction;
5018		final AtomicReference<U> result;
5019		SearchEntriesTask
5020	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5020	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5021		Function<Entry<K,V>, ? extends U> searchFunction,
5022		AtomicReference<U> result) {
5023	<	super(m, p, b);
5023	>	super(p, b, i, f, t);
5024		this.searchFunction = searchFunction; this.result = result;
5025		}
5026		public final U getRawResult() { return result.get(); }
#	Line 5778 | Line 5029 | public class ConcurrentHashMap<K, V>
5029		final AtomicReference<U> result;
5030		if ((searchFunction = this.searchFunction) != null &&
5031		(result = this.result) != null) {
5032	<	for (int b;;) {
5032	>	for (int i = baseIndex, f, h; batch > 0 &&
5033	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5034		if (result.get() != null)
5035		return;
5036	<	if ((b = preSplit()) <= 0)
5785	<	break;
5036	>	addToPendingCount(1);
5037		new SearchEntriesTask<K,V,U>
5038	<	(map, this, b, searchFunction, result).fork();
5038	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5039	>	searchFunction, result).fork();
5040		}
5041		while (result.get() == null) {
5042	<	V v; U u;
5043	<	if ((v = advance()) == null) {
5042	>	U u;
5043	>	Node<K,V> p;
5044	>	if ((p = advance()) == null) {
5045		propagateCompletion();
5046		break;
5047		}
5048	<	if ((u = searchFunction.apply(entryFor(nextKey,
5796	<	v))) != null) {
5048	>	if ((u = searchFunction.apply(p)) != null) {
5049		if (result.compareAndSet(null, u))
5050		quietlyCompleteRoot();
5051		return;
#	Line 5803 | Line 5055 | public class ConcurrentHashMap<K, V>
5055		}
5056		}
5057
5058	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5059	<	extends Traverser<K,V,U> {
5058	>	@SuppressWarnings("serial")
5059	>	static final class SearchMappingsTask<K,V,U>
5060	>	extends BulkTask<K,V,U> {
5061		final BiFunction<? super K, ? super V, ? extends U> searchFunction;
5062		final AtomicReference<U> result;
5063		SearchMappingsTask
5064	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5064	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5065		BiFunction<? super K, ? super V, ? extends U> searchFunction,
5066		AtomicReference<U> result) {
5067	<	super(m, p, b);
5067	>	super(p, b, i, f, t);
5068		this.searchFunction = searchFunction; this.result = result;
5069		}
5070		public final U getRawResult() { return result.get(); }
#	Line 5820 | Line 5073 | public class ConcurrentHashMap<K, V>
5073		final AtomicReference<U> result;
5074		if ((searchFunction = this.searchFunction) != null &&
5075		(result = this.result) != null) {
5076	<	for (int b;;) {
5076	>	for (int i = baseIndex, f, h; batch > 0 &&
5077	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5078		if (result.get() != null)
5079		return;
5080	<	if ((b = preSplit()) <= 0)
5827	<	break;
5080	>	addToPendingCount(1);
5081		new SearchMappingsTask<K,V,U>
5082	<	(map, this, b, searchFunction, result).fork();
5082	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5083	>	searchFunction, result).fork();
5084		}
5085		while (result.get() == null) {
5086	<	V v; U u;
5087	<	if ((v = advance()) == null) {
5086	>	U u;
5087	>	Node<K,V> p;
5088	>	if ((p = advance()) == null) {
5089		propagateCompletion();
5090		break;
5091		}
5092	<	if ((u = searchFunction.apply(nextKey, v)) != null) {
5092	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5093		if (result.compareAndSet(null, u))
5094		quietlyCompleteRoot();
5095		break;
#	Line 5844 | Line 5099 | public class ConcurrentHashMap<K, V>
5099		}
5100		}
5101
5102	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5103	<	extends Traverser<K,V,K> {
5102	>	@SuppressWarnings("serial")
5103	>	static final class ReduceKeysTask<K,V>
5104	>	extends BulkTask<K,V,K> {
5105		final BiFunction<? super K, ? super K, ? extends K> reducer;
5106		K result;
5107		ReduceKeysTask<K,V> rights, nextRight;
5108		ReduceKeysTask
5109	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5109	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5110		ReduceKeysTask<K,V> nextRight,
5111		BiFunction<? super K, ? super K, ? extends K> reducer) {
5112	<	super(m, p, b); this.nextRight = nextRight;
5112	>	super(p, b, i, f, t); this.nextRight = nextRight;
5113		this.reducer = reducer;
5114		}
5115		public final K getRawResult() { return result; }
5116	<	@SuppressWarnings("unchecked") public final void compute() {
5116	>	public final void compute() {
5117		final BiFunction<? super K, ? super K, ? extends K> reducer;
5118		if ((reducer = this.reducer) != null) {
5119	<	for (int b; (b = preSplit()) > 0;)
5119	>	for (int i = baseIndex, f, h; batch > 0 &&
5120	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5121	>	addToPendingCount(1);
5122		(rights = new ReduceKeysTask<K,V>
5123	<	(map, this, b, rights, reducer)).fork();
5123	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5124	>	rights, reducer)).fork();
5125	>	}
5126		K r = null;
5127	<	while (advance() != null) {
5128	<	K u = nextKey;
5127	>	for (Node<K,V> p; (p = advance()) != null; ) {
5128	>	K u = p.key;
5129		r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5130		}
5131		result = r;
5132		CountedCompleter<?> c;
5133		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5134	<	ReduceKeysTask<K,V>
5134	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5135		t = (ReduceKeysTask<K,V>)c,
5136		s = t.rights;
5137		while (s != null) {
#	Line 5886 | Line 5146 | public class ConcurrentHashMap<K, V>
5146		}
5147		}
5148
5149	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5150	<	extends Traverser<K,V,V> {
5149	>	@SuppressWarnings("serial")
5150	>	static final class ReduceValuesTask<K,V>
5151	>	extends BulkTask<K,V,V> {
5152		final BiFunction<? super V, ? super V, ? extends V> reducer;
5153		V result;
5154		ReduceValuesTask<K,V> rights, nextRight;
5155		ReduceValuesTask
5156	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5156	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5157		ReduceValuesTask<K,V> nextRight,
5158		BiFunction<? super V, ? super V, ? extends V> reducer) {
5159	<	super(m, p, b); this.nextRight = nextRight;
5159	>	super(p, b, i, f, t); this.nextRight = nextRight;
5160		this.reducer = reducer;
5161		}
5162		public final V getRawResult() { return result; }
5163	<	@SuppressWarnings("unchecked") public final void compute() {
5163	>	public final void compute() {
5164		final BiFunction<? super V, ? super V, ? extends V> reducer;
5165		if ((reducer = this.reducer) != null) {
5166	<	for (int b; (b = preSplit()) > 0;)
5166	>	for (int i = baseIndex, f, h; batch > 0 &&
5167	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5168	>	addToPendingCount(1);
5169		(rights = new ReduceValuesTask<K,V>
5170	<	(map, this, b, rights, reducer)).fork();
5171	<	V r = null, v;
5172	<	while ((v = advance()) != null)
5170	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5171	>	rights, reducer)).fork();
5172	>	}
5173	>	V r = null;
5174	>	for (Node<K,V> p; (p = advance()) != null; ) {
5175	>	V v = p.val;
5176		r = (r == null) ? v : reducer.apply(r, v);
5177	+	}
5178		result = r;
5179		CountedCompleter<?> c;
5180		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5181	<	ReduceValuesTask<K,V>
5181	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5182		t = (ReduceValuesTask<K,V>)c,
5183		s = t.rights;
5184		while (s != null) {
#	Line 5926 | Line 5193 | public class ConcurrentHashMap<K, V>
5193		}
5194		}
5195
5196	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5197	<	extends Traverser<K,V,Map.Entry<K,V>> {
5196	>	@SuppressWarnings("serial")
5197	>	static final class ReduceEntriesTask<K,V>
5198	>	extends BulkTask<K,V,Map.Entry<K,V>> {
5199		final BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5200		Map.Entry<K,V> result;
5201		ReduceEntriesTask<K,V> rights, nextRight;
5202		ReduceEntriesTask
5203	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5203	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5204		ReduceEntriesTask<K,V> nextRight,
5205		BiFunction<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5206	<	super(m, p, b); this.nextRight = nextRight;
5206	>	super(p, b, i, f, t); this.nextRight = nextRight;
5207		this.reducer = reducer;
5208		}
5209		public final Map.Entry<K,V> getRawResult() { return result; }
5210	<	@SuppressWarnings("unchecked") public final void compute() {
5210	>	public final void compute() {
5211		final BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5212		if ((reducer = this.reducer) != null) {
5213	<	for (int b; (b = preSplit()) > 0;)
5213	>	for (int i = baseIndex, f, h; batch > 0 &&
5214	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5215	>	addToPendingCount(1);
5216		(rights = new ReduceEntriesTask<K,V>
5217	<	(map, this, b, rights, reducer)).fork();
5218	<	Map.Entry<K,V> r = null;
5949	<	V v;
5950	<	while ((v = advance()) != null) {
5951	<	Map.Entry<K,V> u = entryFor(nextKey, v);
5952	<	r = (r == null) ? u : reducer.apply(r, u);
5217	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5218	>	rights, reducer)).fork();
5219		}
5220	+	Map.Entry<K,V> r = null;
5221	+	for (Node<K,V> p; (p = advance()) != null; )
5222	+	r = (r == null) ? p : reducer.apply(r, p);
5223		result = r;
5224		CountedCompleter<?> c;
5225		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5226	<	ReduceEntriesTask<K,V>
5226	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5227		t = (ReduceEntriesTask<K,V>)c,
5228		s = t.rights;
5229		while (s != null) {
#	Line 5969 | Line 5238 | public class ConcurrentHashMap<K, V>
5238		}
5239		}
5240
5241	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5242	<	extends Traverser<K,V,U> {
5241	>	@SuppressWarnings("serial")
5242	>	static final class MapReduceKeysTask<K,V,U>
5243	>	extends BulkTask<K,V,U> {
5244		final Function<? super K, ? extends U> transformer;
5245		final BiFunction<? super U, ? super U, ? extends U> reducer;
5246		U result;
5247		MapReduceKeysTask<K,V,U> rights, nextRight;
5248		MapReduceKeysTask
5249	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5249	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5250		MapReduceKeysTask<K,V,U> nextRight,
5251		Function<? super K, ? extends U> transformer,
5252		BiFunction<? super U, ? super U, ? extends U> reducer) {
5253	<	super(m, p, b); this.nextRight = nextRight;
5253	>	super(p, b, i, f, t); this.nextRight = nextRight;
5254		this.transformer = transformer;
5255		this.reducer = reducer;
5256		}
5257		public final U getRawResult() { return result; }
5258	<	@SuppressWarnings("unchecked") public final void compute() {
5258	>	public final void compute() {
5259		final Function<? super K, ? extends U> transformer;
5260		final BiFunction<? super U, ? super U, ? extends U> reducer;
5261		if ((transformer = this.transformer) != null &&
5262		(reducer = this.reducer) != null) {
5263	<	for (int b; (b = preSplit()) > 0;)
5263	>	for (int i = baseIndex, f, h; batch > 0 &&
5264	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5265	>	addToPendingCount(1);
5266		(rights = new MapReduceKeysTask<K,V,U>
5267	<	(map, this, b, rights, transformer, reducer)).fork();
5268	<	U r = null, u;
5269	<	while (advance() != null) {
5270	<	if ((u = transformer.apply(nextKey)) != null)
5267	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5268	>	rights, transformer, reducer)).fork();
5269	>	}
5270	>	U r = null;
5271	>	for (Node<K,V> p; (p = advance()) != null; ) {
5272	>	U u;
5273	>	if ((u = transformer.apply(p.key)) != null)
5274		r = (r == null) ? u : reducer.apply(r, u);
5275		}
5276		result = r;
5277		CountedCompleter<?> c;
5278		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5279	<	MapReduceKeysTask<K,V,U>
5279	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5280		t = (MapReduceKeysTask<K,V,U>)c,
5281		s = t.rights;
5282		while (s != null) {
#	Line 6016 | Line 5291 | public class ConcurrentHashMap<K, V>
5291		}
5292		}
5293
5294	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5295	<	extends Traverser<K,V,U> {
5294	>	@SuppressWarnings("serial")
5295	>	static final class MapReduceValuesTask<K,V,U>
5296	>	extends BulkTask<K,V,U> {
5297		final Function<? super V, ? extends U> transformer;
5298		final BiFunction<? super U, ? super U, ? extends U> reducer;
5299		U result;
5300		MapReduceValuesTask<K,V,U> rights, nextRight;
5301		MapReduceValuesTask
5302	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5302	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5303		MapReduceValuesTask<K,V,U> nextRight,
5304		Function<? super V, ? extends U> transformer,
5305		BiFunction<? super U, ? super U, ? extends U> reducer) {
5306	<	super(m, p, b); this.nextRight = nextRight;
5306	>	super(p, b, i, f, t); this.nextRight = nextRight;
5307		this.transformer = transformer;
5308		this.reducer = reducer;
5309		}
5310		public final U getRawResult() { return result; }
5311	<	@SuppressWarnings("unchecked") public final void compute() {
5311	>	public final void compute() {
5312		final Function<? super V, ? extends U> transformer;
5313		final BiFunction<? super U, ? super U, ? extends U> reducer;
5314		if ((transformer = this.transformer) != null &&
5315		(reducer = this.reducer) != null) {
5316	<	for (int b; (b = preSplit()) > 0;)
5316	>	for (int i = baseIndex, f, h; batch > 0 &&
5317	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5318	>	addToPendingCount(1);
5319		(rights = new MapReduceValuesTask<K,V,U>
5320	<	(map, this, b, rights, transformer, reducer)).fork();
5321	<	U r = null, u;
5322	<	V v;
5323	<	while ((v = advance()) != null) {
5324	<	if ((u = transformer.apply(v)) != null)
5320	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5321	>	rights, transformer, reducer)).fork();
5322	>	}
5323	>	U r = null;
5324	>	for (Node<K,V> p; (p = advance()) != null; ) {
5325	>	U u;
5326	>	if ((u = transformer.apply(p.val)) != null)
5327		r = (r == null) ? u : reducer.apply(r, u);
5328		}
5329		result = r;
5330		CountedCompleter<?> c;
5331		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5332	<	MapReduceValuesTask<K,V,U>
5332	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5333		t = (MapReduceValuesTask<K,V,U>)c,
5334		s = t.rights;
5335		while (s != null) {
#	Line 6064 | Line 5344 | public class ConcurrentHashMap<K, V>
5344		}
5345		}
5346
5347	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5348	<	extends Traverser<K,V,U> {
5347	>	@SuppressWarnings("serial")
5348	>	static final class MapReduceEntriesTask<K,V,U>
5349	>	extends BulkTask<K,V,U> {
5350		final Function<Map.Entry<K,V>, ? extends U> transformer;
5351		final BiFunction<? super U, ? super U, ? extends U> reducer;
5352		U result;
5353		MapReduceEntriesTask<K,V,U> rights, nextRight;
5354		MapReduceEntriesTask
5355	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5355	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5356		MapReduceEntriesTask<K,V,U> nextRight,
5357		Function<Map.Entry<K,V>, ? extends U> transformer,
5358		BiFunction<? super U, ? super U, ? extends U> reducer) {
5359	<	super(m, p, b); this.nextRight = nextRight;
5359	>	super(p, b, i, f, t); this.nextRight = nextRight;
5360		this.transformer = transformer;
5361		this.reducer = reducer;
5362		}
5363		public final U getRawResult() { return result; }
5364	<	@SuppressWarnings("unchecked") public final void compute() {
5364	>	public final void compute() {
5365		final Function<Map.Entry<K,V>, ? extends U> transformer;
5366		final BiFunction<? super U, ? super U, ? extends U> reducer;
5367		if ((transformer = this.transformer) != null &&
5368		(reducer = this.reducer) != null) {
5369	<	for (int b; (b = preSplit()) > 0;)
5369	>	for (int i = baseIndex, f, h; batch > 0 &&
5370	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5371	>	addToPendingCount(1);
5372		(rights = new MapReduceEntriesTask<K,V,U>
5373	<	(map, this, b, rights, transformer, reducer)).fork();
5374	<	U r = null, u;
5375	<	V v;
5376	<	while ((v = advance()) != null) {
5377	<	if ((u = transformer.apply(entryFor(nextKey,
5378	<	v))) != null)
5373	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5374	>	rights, transformer, reducer)).fork();
5375	>	}
5376	>	U r = null;
5377	>	for (Node<K,V> p; (p = advance()) != null; ) {
5378	>	U u;
5379	>	if ((u = transformer.apply(p)) != null)
5380		r = (r == null) ? u : reducer.apply(r, u);
5381		}
5382		result = r;
5383		CountedCompleter<?> c;
5384		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5385	<	MapReduceEntriesTask<K,V,U>
5385	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5386		t = (MapReduceEntriesTask<K,V,U>)c,
5387		s = t.rights;
5388		while (s != null) {
#	Line 6113 | Line 5397 | public class ConcurrentHashMap<K, V>
5397		}
5398		}
5399
5400	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5401	<	extends Traverser<K,V,U> {
5400	>	@SuppressWarnings("serial")
5401	>	static final class MapReduceMappingsTask<K,V,U>
5402	>	extends BulkTask<K,V,U> {
5403		final BiFunction<? super K, ? super V, ? extends U> transformer;
5404		final BiFunction<? super U, ? super U, ? extends U> reducer;
5405		U result;
5406		MapReduceMappingsTask<K,V,U> rights, nextRight;
5407		MapReduceMappingsTask
5408	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5408	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5409		MapReduceMappingsTask<K,V,U> nextRight,
5410		BiFunction<? super K, ? super V, ? extends U> transformer,
5411		BiFunction<? super U, ? super U, ? extends U> reducer) {
5412	<	super(m, p, b); this.nextRight = nextRight;
5412	>	super(p, b, i, f, t); this.nextRight = nextRight;
5413		this.transformer = transformer;
5414		this.reducer = reducer;
5415		}
5416		public final U getRawResult() { return result; }
5417	<	@SuppressWarnings("unchecked") public final void compute() {
5417	>	public final void compute() {
5418		final BiFunction<? super K, ? super V, ? extends U> transformer;
5419		final BiFunction<? super U, ? super U, ? extends U> reducer;
5420		if ((transformer = this.transformer) != null &&
5421		(reducer = this.reducer) != null) {
5422	<	for (int b; (b = preSplit()) > 0;)
5422	>	for (int i = baseIndex, f, h; batch > 0 &&
5423	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5424	>	addToPendingCount(1);
5425		(rights = new MapReduceMappingsTask<K,V,U>
5426	<	(map, this, b, rights, transformer, reducer)).fork();
5427	<	U r = null, u;
5428	<	V v;
5429	<	while ((v = advance()) != null) {
5430	<	if ((u = transformer.apply(nextKey, v)) != null)
5426	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5427	>	rights, transformer, reducer)).fork();
5428	>	}
5429	>	U r = null;
5430	>	for (Node<K,V> p; (p = advance()) != null; ) {
5431	>	U u;
5432	>	if ((u = transformer.apply(p.key, p.val)) != null)
5433		r = (r == null) ? u : reducer.apply(r, u);
5434		}
5435		result = r;
5436		CountedCompleter<?> c;
5437		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5438	<	MapReduceMappingsTask<K,V,U>
5438	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5439		t = (MapReduceMappingsTask<K,V,U>)c,
5440		s = t.rights;
5441		while (s != null) {
#	Line 6161 | Line 5450 | public class ConcurrentHashMap<K, V>
5450		}
5451		}
5452
5453	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5454	<	extends Traverser<K,V,Double> {
5453	>	@SuppressWarnings("serial")
5454	>	static final class MapReduceKeysToDoubleTask<K,V>
5455	>	extends BulkTask<K,V,Double> {
5456		final ToDoubleFunction<? super K> transformer;
5457		final DoubleBinaryOperator reducer;
5458		final double basis;
5459		double result;
5460		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5461		MapReduceKeysToDoubleTask
5462	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5462	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5463		MapReduceKeysToDoubleTask<K,V> nextRight,
5464		ToDoubleFunction<? super K> transformer,
5465		double basis,
5466		DoubleBinaryOperator reducer) {
5467	<	super(m, p, b); this.nextRight = nextRight;
5467	>	super(p, b, i, f, t); this.nextRight = nextRight;
5468		this.transformer = transformer;
5469		this.basis = basis; this.reducer = reducer;
5470		}
5471		public final Double getRawResult() { return result; }
5472	<	@SuppressWarnings("unchecked") public final void compute() {
5472	>	public final void compute() {
5473		final ToDoubleFunction<? super K> transformer;
5474		final DoubleBinaryOperator reducer;
5475		if ((transformer = this.transformer) != null &&
5476		(reducer = this.reducer) != null) {
5477		double r = this.basis;
5478	<	for (int b; (b = preSplit()) > 0;)
5478	>	for (int i = baseIndex, f, h; batch > 0 &&
5479	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5480	>	addToPendingCount(1);
5481		(rights = new MapReduceKeysToDoubleTask<K,V>
5482	<	(map, this, b, rights, transformer, r, reducer)).fork();
5483	<	while (advance() != null)
5484	<	r = reducer.applyAsDouble(r, transformer.applyAsDouble(nextKey));
5482	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5483	>	rights, transformer, r, reducer)).fork();
5484	>	}
5485	>	for (Node<K,V> p; (p = advance()) != null; )
5486	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.key));
5487		result = r;
5488		CountedCompleter<?> c;
5489		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5490	<	MapReduceKeysToDoubleTask<K,V>
5490	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5491		t = (MapReduceKeysToDoubleTask<K,V>)c,
5492		s = t.rights;
5493		while (s != null) {
#	Line 6205 | Line 5499 | public class ConcurrentHashMap<K, V>
5499		}
5500		}
5501
5502	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5503	<	extends Traverser<K,V,Double> {
5502	>	@SuppressWarnings("serial")
5503	>	static final class MapReduceValuesToDoubleTask<K,V>
5504	>	extends BulkTask<K,V,Double> {
5505		final ToDoubleFunction<? super V> transformer;
5506		final DoubleBinaryOperator reducer;
5507		final double basis;
5508		double result;
5509		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5510		MapReduceValuesToDoubleTask
5511	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5511	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5512		MapReduceValuesToDoubleTask<K,V> nextRight,
5513		ToDoubleFunction<? super V> transformer,
5514		double basis,
5515		DoubleBinaryOperator reducer) {
5516	<	super(m, p, b); this.nextRight = nextRight;
5516	>	super(p, b, i, f, t); this.nextRight = nextRight;
5517		this.transformer = transformer;
5518		this.basis = basis; this.reducer = reducer;
5519		}
5520		public final Double getRawResult() { return result; }
5521	<	@SuppressWarnings("unchecked") public final void compute() {
5521	>	public final void compute() {
5522		final ToDoubleFunction<? super V> transformer;
5523		final DoubleBinaryOperator reducer;
5524		if ((transformer = this.transformer) != null &&
5525		(reducer = this.reducer) != null) {
5526		double r = this.basis;
5527	<	for (int b; (b = preSplit()) > 0;)
5527	>	for (int i = baseIndex, f, h; batch > 0 &&
5528	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5529	>	addToPendingCount(1);
5530		(rights = new MapReduceValuesToDoubleTask<K,V>
5531	<	(map, this, b, rights, transformer, r, reducer)).fork();
5532	<	V v;
5533	<	while ((v = advance()) != null)
5534	<	r = reducer.applyAsDouble(r, transformer.applyAsDouble(v));
5531	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5532	>	rights, transformer, r, reducer)).fork();
5533	>	}
5534	>	for (Node<K,V> p; (p = advance()) != null; )
5535	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.val));
5536		result = r;
5537		CountedCompleter<?> c;
5538		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5539	<	MapReduceValuesToDoubleTask<K,V>
5539	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5540		t = (MapReduceValuesToDoubleTask<K,V>)c,
5541		s = t.rights;
5542		while (s != null) {
#	Line 6250 | Line 5548 | public class ConcurrentHashMap<K, V>
5548		}
5549		}
5550
5551	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5552	<	extends Traverser<K,V,Double> {
5551	>	@SuppressWarnings("serial")
5552	>	static final class MapReduceEntriesToDoubleTask<K,V>
5553	>	extends BulkTask<K,V,Double> {
5554		final ToDoubleFunction<Map.Entry<K,V>> transformer;
5555		final DoubleBinaryOperator reducer;
5556		final double basis;
5557		double result;
5558		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5559		MapReduceEntriesToDoubleTask
5560	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5560	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5561		MapReduceEntriesToDoubleTask<K,V> nextRight,
5562		ToDoubleFunction<Map.Entry<K,V>> transformer,
5563		double basis,
5564		DoubleBinaryOperator reducer) {
5565	<	super(m, p, b); this.nextRight = nextRight;
5565	>	super(p, b, i, f, t); this.nextRight = nextRight;
5566		this.transformer = transformer;
5567		this.basis = basis; this.reducer = reducer;
5568		}
5569		public final Double getRawResult() { return result; }
5570	<	@SuppressWarnings("unchecked") public final void compute() {
5570	>	public final void compute() {
5571		final ToDoubleFunction<Map.Entry<K,V>> transformer;
5572		final DoubleBinaryOperator reducer;
5573		if ((transformer = this.transformer) != null &&
5574		(reducer = this.reducer) != null) {
5575		double r = this.basis;
5576	<	for (int b; (b = preSplit()) > 0;)
5576	>	for (int i = baseIndex, f, h; batch > 0 &&
5577	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5578	>	addToPendingCount(1);
5579		(rights = new MapReduceEntriesToDoubleTask<K,V>
5580	<	(map, this, b, rights, transformer, r, reducer)).fork();
5581	<	V v;
5582	<	while ((v = advance()) != null)
5583	<	r = reducer.applyAsDouble(r, transformer.applyAsDouble(entryFor(nextKey,
5584	<	v)));
5580	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5581	>	rights, transformer, r, reducer)).fork();
5582	>	}
5583	>	for (Node<K,V> p; (p = advance()) != null; )
5584	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p));
5585		result = r;
5586		CountedCompleter<?> c;
5587		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5588	<	MapReduceEntriesToDoubleTask<K,V>
5588	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5589		t = (MapReduceEntriesToDoubleTask<K,V>)c,
5590		s = t.rights;
5591		while (s != null) {
#	Line 6296 | Line 5597 | public class ConcurrentHashMap<K, V>
5597		}
5598		}
5599
5600	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5601	<	extends Traverser<K,V,Double> {
5600	>	@SuppressWarnings("serial")
5601	>	static final class MapReduceMappingsToDoubleTask<K,V>
5602	>	extends BulkTask<K,V,Double> {
5603		final ToDoubleBiFunction<? super K, ? super V> transformer;
5604		final DoubleBinaryOperator reducer;
5605		final double basis;
5606		double result;
5607		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5608		MapReduceMappingsToDoubleTask
5609	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5609	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5610		MapReduceMappingsToDoubleTask<K,V> nextRight,
5611		ToDoubleBiFunction<? super K, ? super V> transformer,
5612		double basis,
5613		DoubleBinaryOperator reducer) {
5614	<	super(m, p, b); this.nextRight = nextRight;
5614	>	super(p, b, i, f, t); this.nextRight = nextRight;
5615		this.transformer = transformer;
5616		this.basis = basis; this.reducer = reducer;
5617		}
5618		public final Double getRawResult() { return result; }
5619	<	@SuppressWarnings("unchecked") public final void compute() {
5619	>	public final void compute() {
5620		final ToDoubleBiFunction<? super K, ? super V> transformer;
5621		final DoubleBinaryOperator reducer;
5622		if ((transformer = this.transformer) != null &&
5623		(reducer = this.reducer) != null) {
5624		double r = this.basis;
5625	<	for (int b; (b = preSplit()) > 0;)
5625	>	for (int i = baseIndex, f, h; batch > 0 &&
5626	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5627	>	addToPendingCount(1);
5628		(rights = new MapReduceMappingsToDoubleTask<K,V>
5629	<	(map, this, b, rights, transformer, r, reducer)).fork();
5630	<	V v;
5631	<	while ((v = advance()) != null)
5632	<	r = reducer.applyAsDouble(r, transformer.applyAsDouble(nextKey, v));
5629	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5630	>	rights, transformer, r, reducer)).fork();
5631	>	}
5632	>	for (Node<K,V> p; (p = advance()) != null; )
5633	>	r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.key, p.val));
5634		result = r;
5635		CountedCompleter<?> c;
5636		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5637	<	MapReduceMappingsToDoubleTask<K,V>
5637	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5638		t = (MapReduceMappingsToDoubleTask<K,V>)c,
5639		s = t.rights;
5640		while (s != null) {
#	Line 6341 | Line 5646 | public class ConcurrentHashMap<K, V>
5646		}
5647		}
5648
5649	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5650	<	extends Traverser<K,V,Long> {
5649	>	@SuppressWarnings("serial")
5650	>	static final class MapReduceKeysToLongTask<K,V>
5651	>	extends BulkTask<K,V,Long> {
5652		final ToLongFunction<? super K> transformer;
5653		final LongBinaryOperator reducer;
5654		final long basis;
5655		long result;
5656		MapReduceKeysToLongTask<K,V> rights, nextRight;
5657		MapReduceKeysToLongTask
5658	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5658	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5659		MapReduceKeysToLongTask<K,V> nextRight,
5660		ToLongFunction<? super K> transformer,
5661		long basis,
5662		LongBinaryOperator reducer) {
5663	<	super(m, p, b); this.nextRight = nextRight;
5663	>	super(p, b, i, f, t); this.nextRight = nextRight;
5664		this.transformer = transformer;
5665		this.basis = basis; this.reducer = reducer;
5666		}
5667		public final Long getRawResult() { return result; }
5668	<	@SuppressWarnings("unchecked") public final void compute() {
5668	>	public final void compute() {
5669		final ToLongFunction<? super K> transformer;
5670		final LongBinaryOperator reducer;
5671		if ((transformer = this.transformer) != null &&
5672		(reducer = this.reducer) != null) {
5673		long r = this.basis;
5674	<	for (int b; (b = preSplit()) > 0;)
5674	>	for (int i = baseIndex, f, h; batch > 0 &&
5675	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5676	>	addToPendingCount(1);
5677		(rights = new MapReduceKeysToLongTask<K,V>
5678	<	(map, this, b, rights, transformer, r, reducer)).fork();
5679	<	while (advance() != null)
5680	<	r = reducer.applyAsLong(r, transformer.applyAsLong(nextKey));
5678	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5679	>	rights, transformer, r, reducer)).fork();
5680	>	}
5681	>	for (Node<K,V> p; (p = advance()) != null; )
5682	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.key));
5683		result = r;
5684		CountedCompleter<?> c;
5685		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5686	<	MapReduceKeysToLongTask<K,V>
5686	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5687		t = (MapReduceKeysToLongTask<K,V>)c,
5688		s = t.rights;
5689		while (s != null) {
#	Line 6385 | Line 5695 | public class ConcurrentHashMap<K, V>
5695		}
5696		}
5697
5698	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5699	<	extends Traverser<K,V,Long> {
5698	>	@SuppressWarnings("serial")
5699	>	static final class MapReduceValuesToLongTask<K,V>
5700	>	extends BulkTask<K,V,Long> {
5701		final ToLongFunction<? super V> transformer;
5702		final LongBinaryOperator reducer;
5703		final long basis;
5704		long result;
5705		MapReduceValuesToLongTask<K,V> rights, nextRight;
5706		MapReduceValuesToLongTask
5707	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5707	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5708		MapReduceValuesToLongTask<K,V> nextRight,
5709		ToLongFunction<? super V> transformer,
5710		long basis,
5711		LongBinaryOperator reducer) {
5712	<	super(m, p, b); this.nextRight = nextRight;
5712	>	super(p, b, i, f, t); this.nextRight = nextRight;
5713		this.transformer = transformer;
5714		this.basis = basis; this.reducer = reducer;
5715		}
5716		public final Long getRawResult() { return result; }
5717	<	@SuppressWarnings("unchecked") public final void compute() {
5717	>	public final void compute() {
5718		final ToLongFunction<? super V> transformer;
5719		final LongBinaryOperator reducer;
5720		if ((transformer = this.transformer) != null &&
5721		(reducer = this.reducer) != null) {
5722		long r = this.basis;
5723	<	for (int b; (b = preSplit()) > 0;)
5723	>	for (int i = baseIndex, f, h; batch > 0 &&
5724	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5725	>	addToPendingCount(1);
5726		(rights = new MapReduceValuesToLongTask<K,V>
5727	<	(map, this, b, rights, transformer, r, reducer)).fork();
5728	<	V v;
5729	<	while ((v = advance()) != null)
5730	<	r = reducer.applyAsLong(r, transformer.applyAsLong(v));
5727	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5728	>	rights, transformer, r, reducer)).fork();
5729	>	}
5730	>	for (Node<K,V> p; (p = advance()) != null; )
5731	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.val));
5732		result = r;
5733		CountedCompleter<?> c;
5734		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5735	<	MapReduceValuesToLongTask<K,V>
5735	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5736		t = (MapReduceValuesToLongTask<K,V>)c,
5737		s = t.rights;
5738		while (s != null) {
#	Line 6430 | Line 5744 | public class ConcurrentHashMap<K, V>
5744		}
5745		}
5746
5747	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5748	<	extends Traverser<K,V,Long> {
5747	>	@SuppressWarnings("serial")
5748	>	static final class MapReduceEntriesToLongTask<K,V>
5749	>	extends BulkTask<K,V,Long> {
5750		final ToLongFunction<Map.Entry<K,V>> transformer;
5751		final LongBinaryOperator reducer;
5752		final long basis;
5753		long result;
5754		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5755		MapReduceEntriesToLongTask
5756	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5756	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5757		MapReduceEntriesToLongTask<K,V> nextRight,
5758		ToLongFunction<Map.Entry<K,V>> transformer,
5759		long basis,
5760		LongBinaryOperator reducer) {
5761	<	super(m, p, b); this.nextRight = nextRight;
5761	>	super(p, b, i, f, t); this.nextRight = nextRight;
5762		this.transformer = transformer;
5763		this.basis = basis; this.reducer = reducer;
5764		}
5765		public final Long getRawResult() { return result; }
5766	<	@SuppressWarnings("unchecked") public final void compute() {
5766	>	public final void compute() {
5767		final ToLongFunction<Map.Entry<K,V>> transformer;
5768		final LongBinaryOperator reducer;
5769		if ((transformer = this.transformer) != null &&
5770		(reducer = this.reducer) != null) {
5771		long r = this.basis;
5772	<	for (int b; (b = preSplit()) > 0;)
5772	>	for (int i = baseIndex, f, h; batch > 0 &&
5773	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5774	>	addToPendingCount(1);
5775		(rights = new MapReduceEntriesToLongTask<K,V>
5776	<	(map, this, b, rights, transformer, r, reducer)).fork();
5777	<	V v;
5778	<	while ((v = advance()) != null)
5779	<	r = reducer.applyAsLong(r, transformer.applyAsLong(entryFor(nextKey, v)));
5776	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5777	>	rights, transformer, r, reducer)).fork();
5778	>	}
5779	>	for (Node<K,V> p; (p = advance()) != null; )
5780	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p));
5781		result = r;
5782		CountedCompleter<?> c;
5783		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5784	<	MapReduceEntriesToLongTask<K,V>
5784	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5785		t = (MapReduceEntriesToLongTask<K,V>)c,
5786		s = t.rights;
5787		while (s != null) {
#	Line 6475 | Line 5793 | public class ConcurrentHashMap<K, V>
5793		}
5794		}
5795
5796	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5797	<	extends Traverser<K,V,Long> {
5796	>	@SuppressWarnings("serial")
5797	>	static final class MapReduceMappingsToLongTask<K,V>
5798	>	extends BulkTask<K,V,Long> {
5799		final ToLongBiFunction<? super K, ? super V> transformer;
5800		final LongBinaryOperator reducer;
5801		final long basis;
5802		long result;
5803		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5804		MapReduceMappingsToLongTask
5805	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5805	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5806		MapReduceMappingsToLongTask<K,V> nextRight,
5807		ToLongBiFunction<? super K, ? super V> transformer,
5808		long basis,
5809		LongBinaryOperator reducer) {
5810	<	super(m, p, b); this.nextRight = nextRight;
5810	>	super(p, b, i, f, t); this.nextRight = nextRight;
5811		this.transformer = transformer;
5812		this.basis = basis; this.reducer = reducer;
5813		}
5814		public final Long getRawResult() { return result; }
5815	<	@SuppressWarnings("unchecked") public final void compute() {
5815	>	public final void compute() {
5816		final ToLongBiFunction<? super K, ? super V> transformer;
5817		final LongBinaryOperator reducer;
5818		if ((transformer = this.transformer) != null &&
5819		(reducer = this.reducer) != null) {
5820		long r = this.basis;
5821	<	for (int b; (b = preSplit()) > 0;)
5821	>	for (int i = baseIndex, f, h; batch > 0 &&
5822	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5823	>	addToPendingCount(1);
5824		(rights = new MapReduceMappingsToLongTask<K,V>
5825	<	(map, this, b, rights, transformer, r, reducer)).fork();
5826	<	V v;
5827	<	while ((v = advance()) != null)
5828	<	r = reducer.applyAsLong(r, transformer.applyAsLong(nextKey, v));
5825	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5826	>	rights, transformer, r, reducer)).fork();
5827	>	}
5828	>	for (Node<K,V> p; (p = advance()) != null; )
5829	>	r = reducer.applyAsLong(r, transformer.applyAsLong(p.key, p.val));
5830		result = r;
5831		CountedCompleter<?> c;
5832		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5833	<	MapReduceMappingsToLongTask<K,V>
5833	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5834		t = (MapReduceMappingsToLongTask<K,V>)c,
5835		s = t.rights;
5836		while (s != null) {
#	Line 6520 | Line 5842 | public class ConcurrentHashMap<K, V>
5842		}
5843		}
5844
5845	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5846	<	extends Traverser<K,V,Integer> {
5845	>	@SuppressWarnings("serial")
5846	>	static final class MapReduceKeysToIntTask<K,V>
5847	>	extends BulkTask<K,V,Integer> {
5848		final ToIntFunction<? super K> transformer;
5849		final IntBinaryOperator reducer;
5850		final int basis;
5851		int result;
5852		MapReduceKeysToIntTask<K,V> rights, nextRight;
5853		MapReduceKeysToIntTask
5854	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5854	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5855		MapReduceKeysToIntTask<K,V> nextRight,
5856		ToIntFunction<? super K> transformer,
5857		int basis,
5858		IntBinaryOperator reducer) {
5859	<	super(m, p, b); this.nextRight = nextRight;
5859	>	super(p, b, i, f, t); this.nextRight = nextRight;
5860		this.transformer = transformer;
5861		this.basis = basis; this.reducer = reducer;
5862		}
5863		public final Integer getRawResult() { return result; }
5864	<	@SuppressWarnings("unchecked") public final void compute() {
5864	>	public final void compute() {
5865		final ToIntFunction<? super K> transformer;
5866		final IntBinaryOperator reducer;
5867		if ((transformer = this.transformer) != null &&
5868		(reducer = this.reducer) != null) {
5869		int r = this.basis;
5870	<	for (int b; (b = preSplit()) > 0;)
5870	>	for (int i = baseIndex, f, h; batch > 0 &&
5871	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5872	>	addToPendingCount(1);
5873		(rights = new MapReduceKeysToIntTask<K,V>
5874	<	(map, this, b, rights, transformer, r, reducer)).fork();
5875	<	while (advance() != null)
5876	<	r = reducer.applyAsInt(r, transformer.applyAsInt(nextKey));
5874	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5875	>	rights, transformer, r, reducer)).fork();
5876	>	}
5877	>	for (Node<K,V> p; (p = advance()) != null; )
5878	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.key));
5879		result = r;
5880		CountedCompleter<?> c;
5881		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5882	<	MapReduceKeysToIntTask<K,V>
5882	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5883		t = (MapReduceKeysToIntTask<K,V>)c,
5884		s = t.rights;
5885		while (s != null) {
#	Line 6564 | Line 5891 | public class ConcurrentHashMap<K, V>
5891		}
5892		}
5893
5894	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5895	<	extends Traverser<K,V,Integer> {
5894	>	@SuppressWarnings("serial")
5895	>	static final class MapReduceValuesToIntTask<K,V>
5896	>	extends BulkTask<K,V,Integer> {
5897		final ToIntFunction<? super V> transformer;
5898		final IntBinaryOperator reducer;
5899		final int basis;
5900		int result;
5901		MapReduceValuesToIntTask<K,V> rights, nextRight;
5902		MapReduceValuesToIntTask
5903	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5903	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5904		MapReduceValuesToIntTask<K,V> nextRight,
5905		ToIntFunction<? super V> transformer,
5906		int basis,
5907		IntBinaryOperator reducer) {
5908	<	super(m, p, b); this.nextRight = nextRight;
5908	>	super(p, b, i, f, t); this.nextRight = nextRight;
5909		this.transformer = transformer;
5910		this.basis = basis; this.reducer = reducer;
5911		}
5912		public final Integer getRawResult() { return result; }
5913	<	@SuppressWarnings("unchecked") public final void compute() {
5913	>	public final void compute() {
5914		final ToIntFunction<? super V> transformer;
5915		final IntBinaryOperator reducer;
5916		if ((transformer = this.transformer) != null &&
5917		(reducer = this.reducer) != null) {
5918		int r = this.basis;
5919	<	for (int b; (b = preSplit()) > 0;)
5919	>	for (int i = baseIndex, f, h; batch > 0 &&
5920	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5921	>	addToPendingCount(1);
5922		(rights = new MapReduceValuesToIntTask<K,V>
5923	<	(map, this, b, rights, transformer, r, reducer)).fork();
5924	<	V v;
5925	<	while ((v = advance()) != null)
5926	<	r = reducer.applyAsInt(r, transformer.applyAsInt(v));
5923	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5924	>	rights, transformer, r, reducer)).fork();
5925	>	}
5926	>	for (Node<K,V> p; (p = advance()) != null; )
5927	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.val));
5928		result = r;
5929		CountedCompleter<?> c;
5930		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5931	<	MapReduceValuesToIntTask<K,V>
5931	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5932		t = (MapReduceValuesToIntTask<K,V>)c,
5933		s = t.rights;
5934		while (s != null) {
#	Line 6609 | Line 5940 | public class ConcurrentHashMap<K, V>
5940		}
5941		}
5942
5943	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
5944	<	extends Traverser<K,V,Integer> {
5943	>	@SuppressWarnings("serial")
5944	>	static final class MapReduceEntriesToIntTask<K,V>
5945	>	extends BulkTask<K,V,Integer> {
5946		final ToIntFunction<Map.Entry<K,V>> transformer;
5947		final IntBinaryOperator reducer;
5948		final int basis;
5949		int result;
5950		MapReduceEntriesToIntTask<K,V> rights, nextRight;
5951		MapReduceEntriesToIntTask
5952	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
5952	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5953		MapReduceEntriesToIntTask<K,V> nextRight,
5954		ToIntFunction<Map.Entry<K,V>> transformer,
5955		int basis,
5956		IntBinaryOperator reducer) {
5957	<	super(m, p, b); this.nextRight = nextRight;
5957	>	super(p, b, i, f, t); this.nextRight = nextRight;
5958		this.transformer = transformer;
5959		this.basis = basis; this.reducer = reducer;
5960		}
5961		public final Integer getRawResult() { return result; }
5962	<	@SuppressWarnings("unchecked") public final void compute() {
5962	>	public final void compute() {
5963		final ToIntFunction<Map.Entry<K,V>> transformer;
5964		final IntBinaryOperator reducer;
5965		if ((transformer = this.transformer) != null &&
5966		(reducer = this.reducer) != null) {
5967		int r = this.basis;
5968	<	for (int b; (b = preSplit()) > 0;)
5968	>	for (int i = baseIndex, f, h; batch > 0 &&
5969	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5970	>	addToPendingCount(1);
5971		(rights = new MapReduceEntriesToIntTask<K,V>
5972	<	(map, this, b, rights, transformer, r, reducer)).fork();
5973	<	V v;
5974	<	while ((v = advance()) != null)
5975	<	r = reducer.applyAsInt(r, transformer.applyAsInt(entryFor(nextKey,
5976	<	v)));
5972	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5973	>	rights, transformer, r, reducer)).fork();
5974	>	}
5975	>	for (Node<K,V> p; (p = advance()) != null; )
5976	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p));
5977		result = r;
5978		CountedCompleter<?> c;
5979		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5980	<	MapReduceEntriesToIntTask<K,V>
5980	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
5981		t = (MapReduceEntriesToIntTask<K,V>)c,
5982		s = t.rights;
5983		while (s != null) {
#	Line 6655 | Line 5989 | public class ConcurrentHashMap<K, V>
5989		}
5990		}
5991
5992	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
5993	<	extends Traverser<K,V,Integer> {
5992	>	@SuppressWarnings("serial")
5993	>	static final class MapReduceMappingsToIntTask<K,V>
5994	>	extends BulkTask<K,V,Integer> {
5995		final ToIntBiFunction<? super K, ? super V> transformer;
5996		final IntBinaryOperator reducer;
5997		final int basis;
5998		int result;
5999		MapReduceMappingsToIntTask<K,V> rights, nextRight;
6000		MapReduceMappingsToIntTask
6001	<	(ConcurrentHashMap<K,V> m, Traverser<K,V,?> p, int b,
6001	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6002		MapReduceMappingsToIntTask<K,V> nextRight,
6003		ToIntBiFunction<? super K, ? super V> transformer,
6004		int basis,
6005		IntBinaryOperator reducer) {
6006	<	super(m, p, b); this.nextRight = nextRight;
6006	>	super(p, b, i, f, t); this.nextRight = nextRight;
6007		this.transformer = transformer;
6008		this.basis = basis; this.reducer = reducer;
6009		}
6010		public final Integer getRawResult() { return result; }
6011	<	@SuppressWarnings("unchecked") public final void compute() {
6011	>	public final void compute() {
6012		final ToIntBiFunction<? super K, ? super V> transformer;
6013		final IntBinaryOperator reducer;
6014		if ((transformer = this.transformer) != null &&
6015		(reducer = this.reducer) != null) {
6016		int r = this.basis;
6017	<	for (int b; (b = preSplit()) > 0;)
6017	>	for (int i = baseIndex, f, h; batch > 0 &&
6018	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6019	>	addToPendingCount(1);
6020		(rights = new MapReduceMappingsToIntTask<K,V>
6021	<	(map, this, b, rights, transformer, r, reducer)).fork();
6022	<	V v;
6023	<	while ((v = advance()) != null)
6024	<	r = reducer.applyAsInt(r, transformer.applyAsInt(nextKey, v));
6021	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6022	>	rights, transformer, r, reducer)).fork();
6023	>	}
6024	>	for (Node<K,V> p; (p = advance()) != null; )
6025	>	r = reducer.applyAsInt(r, transformer.applyAsInt(p.key, p.val));
6026		result = r;
6027		CountedCompleter<?> c;
6028		for (c = firstComplete(); c != null; c = c.nextComplete()) {
6029	<	MapReduceMappingsToIntTask<K,V>
6029	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
6030		t = (MapReduceMappingsToIntTask<K,V>)c,
6031		s = t.rights;
6032		while (s != null) {
#	Line 6725 | Line 6063 | public class ConcurrentHashMap<K, V>
6063		(k.getDeclaredField("baseCount"));
6064		CELLSBUSY = U.objectFieldOffset
6065		(k.getDeclaredField("cellsBusy"));
6066	<	Class<?> ck = Cell.class;
6066	>	Class<?> ck = CounterCell.class;
6067		CELLVALUE = U.objectFieldOffset
6068		(ck.getDeclaredField("value"));
6069	<	Class<?> sc = Node[].class;
6070	<	ABASE = U.arrayBaseOffset(sc);
6071	<	int scale = U.arrayIndexScale(sc);
6069	>	Class<?> ak = Node[].class;
6070	>	ABASE = U.arrayBaseOffset(ak);
6071	>	int scale = U.arrayIndexScale(ak);
6072		if ((scale & (scale - 1)) != 0)
6073		throw new Error("data type scale not a power of two");
6074		ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
#	Line 6738 | Line 6076 | public class ConcurrentHashMap<K, V>
6076		throw new Error(e);
6077		}
6078		}
6741	–
6079		}

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