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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.82 by dl, Thu Dec 13 20:34:00 2012 UTC vs.
Revision 1.110 by dl, Thu Jul 4 18:34:49 2013 UTC

#	Line 6 | Line 6
6
7		package jsr166e;
8
9	<	import java.util.Comparator;
9	>	import jsr166e.ForkJoinPool;
10	>
11	>	import java.io.ObjectStreamField;
12	>	import java.io.Serializable;
13	>	import java.lang.reflect.ParameterizedType;
14	>	import java.lang.reflect.Type;
15		import java.util.Arrays;
11	–	import java.util.Map;
12	–	import java.util.Set;
16		import java.util.Collection;
17	<	import java.util.AbstractMap;
18	<	import java.util.AbstractSet;
19	<	import java.util.AbstractCollection;
17	<	import java.util.Hashtable;
17	>	import java.util.Comparator;
18	>	import java.util.ConcurrentModificationException;
19	>	import java.util.Enumeration;
20		import java.util.HashMap;
21	+	import java.util.Hashtable;
22		import java.util.Iterator;
23	<	import java.util.Enumeration;
21	<	import java.util.ConcurrentModificationException;
23	>	import java.util.Map;
24		import java.util.NoSuchElementException;
25	+	import java.util.Set;
26		import java.util.concurrent.ConcurrentMap;
24	–	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
25	–	import java.util.concurrent.atomic.AtomicInteger;
27		import java.util.concurrent.atomic.AtomicReference;
28	<	import java.io.Serializable;
28	>	import java.util.concurrent.atomic.AtomicInteger;
29	>	import java.util.concurrent.locks.LockSupport;
30	>	import java.util.concurrent.locks.ReentrantLock;
31
32		/**
33		* A hash table supporting full concurrency of retrievals and
#	Line 78 | Line 81 | import java.io.Serializable;
81		* expected {@code concurrencyLevel} as an additional hint for
82		* internal sizing.  Note that using many keys with exactly the same
83		* {@code hashCode()} is a sure way to slow down performance of any
84	<	* hash table.
84	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
85	>	* this class may use comparison order among keys to help break ties.
86		*
87		* <p>A {@link Set} projection of a ConcurrentHashMapV8 may be created
88		* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
#	Line 86 | Line 90 | import java.io.Serializable;
90		* mapped values are (perhaps transiently) not used or all take the
91		* same mapping value.
92		*
89	–	* <p>A ConcurrentHashMapV8 can be used as scalable frequency map (a
90	–	* form of histogram or multiset) by using {@link LongAdder} values
91	–	* and initializing via {@link #computeIfAbsent}. For example, to add
92	–	* a count to a {@code ConcurrentHashMapV8<String,LongAdder> freqs}, you
93	–	* can use {@code freqs.computeIfAbsent(k -> new
94	–	* LongAdder()).increment();}
95	–	*
93		* <p>This class and its views and iterators implement all of the
94		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
95		* interfaces.
#	Line 100 | Line 97 | import java.io.Serializable;
97		* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
98		* does <em>not</em> allow {@code null} to be used as a key or value.
99		*
100	<	* <p>ConcurrentHashMapV8s support parallel operations using the {@link
101	<	* ForkJoinPool#commonPool}. (Tasks that may be used in other contexts
102	<	* are available in class {@link ForkJoinTasks}). These operations are
103	<	* designed to be safely, and often sensibly, applied even with maps
104	<	* that are being concurrently updated by other threads; for example,
105	<	* when computing a snapshot summary of the values in a shared
106	<	* registry.  There are three kinds of operation, each with four
107	<	* forms, accepting functions with Keys, Values, Entries, and (Key,
108	<	* Value) arguments and/or return values. (The first three forms are
109	<	* also available via the {@link #keySet()}, {@link #values()} and
110	<	* {@link #entrySet()} views). Because the elements of a
111	<	* ConcurrentHashMapV8 are not ordered in any particular way, and may be
112	<	* processed in different orders in different parallel executions, the
113	<	* correctness of supplied functions should not depend on any
114	<	* ordering, or on any other objects or values that may transiently
118	<	* change while computation is in progress; and except for forEach
119	<	* actions, should ideally be side-effect-free.
100	>	* <p>ConcurrentHashMapV8s support a set of sequential and parallel bulk
101	>	* operations that are designed
102	>	* to be safely, and often sensibly, applied even with maps that are
103	>	* being concurrently updated by other threads; for example, when
104	>	* computing a snapshot summary of the values in a shared registry.
105	>	* There are three kinds of operation, each with four forms, accepting
106	>	* functions with Keys, Values, Entries, and (Key, Value) arguments
107	>	* and/or return values. Because the elements of a ConcurrentHashMapV8
108	>	* are not ordered in any particular way, and may be processed in
109	>	* different orders in different parallel executions, the correctness
110	>	* of supplied functions should not depend on any ordering, or on any
111	>	* other objects or values that may transiently change while
112	>	* computation is in progress; and except for forEach actions, should
113	>	* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry}
114	>	* objects do not support method {@code setValue}.
115		*
116		* <ul>
117		* <li> forEach: Perform a given action on each element.
#	Line 143 | Line 138 | import java.io.Serializable;
138		* <li> Reductions to scalar doubles, longs, and ints, using a
139		* given basis value.</li>
140		*
146	–	* </li>
141		* </ul>
142	+	* </li>
143		* </ul>
144		*
145	+	* <p>These bulk operations accept a {@code parallelismThreshold}
146	+	* argument. Methods proceed sequentially if the current map size is
147	+	* estimated to be less than the given threshold. Using a value of
148	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
149	+	* of {@code 1} results in maximal parallelism by partitioning into
150	+	* enough subtasks to fully utilize the {@link
151	+	* ForkJoinPool#commonPool()} that is used for all parallel
152	+	* computations. Normally, you would initially choose one of these
153	+	* extreme values, and then measure performance of using in-between
154	+	* values that trade off overhead versus throughput.
155	+	*
156		* <p>The concurrency properties of bulk operations follow
157		* from those of ConcurrentHashMapV8: Any non-null result returned
158		* from {@code get(key)} and related access methods bears a
#	Line 189 | Line 195 | import java.io.Serializable;
195		* exceptions, or would have done so if the first exception had
196		* not occurred.
197		*
198	<	* <p>Parallel speedups for bulk operations compared to sequential
199	<	* processing are common but not guaranteed.  Operations involving
200	<	* brief functions on small maps may execute more slowly than
201	<	* sequential loops if the underlying work to parallelize the
202	<	* computation is more expensive than the computation itself.
203	<	* Similarly, parallelization may not lead to much actual parallelism
204	<	* if all processors are busy performing unrelated tasks.
198	>	* <p>Speedups for parallel compared to sequential forms are common
199	>	* but not guaranteed.  Parallel operations involving brief functions
200	>	* on small maps may execute more slowly than sequential forms if the
201	>	* underlying work to parallelize the computation is more expensive
202	>	* than the computation itself.  Similarly, parallelization may not
203	>	* lead to much actual parallelism if all processors are busy
204	>	* performing unrelated tasks.
205		*
206		* <p>All arguments to all task methods must be non-null.
207		*
#	Line 212 | Line 218 | import java.io.Serializable;
218		* @param <K> the type of keys maintained by this map
219		* @param <V> the type of mapped values
220		*/
221	<	public class ConcurrentHashMapV8<K, V>
222	<	implements ConcurrentMap<K, V>, Serializable {
221	>	public class ConcurrentHashMapV8<K,V>
222	>	implements ConcurrentMap<K,V>, Serializable {
223		private static final long serialVersionUID = 7249069246763182397L;
224
225		/**
226	<	* A partitionable iterator. A Spliterator can be traversed
227	<	* directly, but can also be partitioned (before traversal) by
228	<	* creating another Spliterator that covers a non-overlapping
223	<	* portion of the elements, and so may be amenable to parallel
224	<	* execution.
225	<	*
226	<	* <p>This interface exports a subset of expected JDK8
227	<	* functionality.
228	<	*
229	<	* <p>Sample usage: Here is one (of the several) ways to compute
230	<	* the sum of the values held in a map using the ForkJoin
231	<	* framework. As illustrated here, Spliterators are well suited to
232	<	* designs in which a task repeatedly splits off half its work
233	<	* into forked subtasks until small enough to process directly,
234	<	* and then joins these subtasks. Variants of this style can also
235	<	* be used in completion-based designs.
236	<	*
237	<	* <pre>
238	<	* {@code ConcurrentHashMapV8<String, Long> m = ...
239	<	* // split as if have 8 * parallelism, for load balance
240	<	* int n = m.size();
241	<	* int p = aForkJoinPool.getParallelism() * 8;
242	<	* int split = (n < p)? n : p;
243	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
244	<	* // ...
245	<	* static class SumValues extends RecursiveTask<Long> {
246	<	*   final Spliterator<Long> s;
247	<	*   final int split;             // split while > 1
248	<	*   final SumValues nextJoin;    // records forked subtasks to join
249	<	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
250	<	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
251	<	*   }
252	<	*   public Long compute() {
253	<	*     long sum = 0;
254	<	*     SumValues subtasks = null; // fork subtasks
255	<	*     for (int s = split >>> 1; s > 0; s >>>= 1)
256	<	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
257	<	*     while (s.hasNext())        // directly process remaining elements
258	<	*       sum += s.next();
259	<	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
260	<	*       sum += t.join();         // collect subtask results
261	<	*     return sum;
262	<	*   }
263	<	* }
264	<	* }</pre>
226	>	* An object for traversing and partitioning elements of a source.
227	>	* This interface provides a subset of the functionality of JDK8
228	>	* java.util.Spliterator.
229		*/
230	<	public static interface Spliterator<T> extends Iterator<T> {
230	>	public static interface ConcurrentHashMapSpliterator<T> {
231		/**
232	<	* Returns a Spliterator covering approximately half of the
233	<	* elements, guaranteed not to overlap with those subsequently
234	<	* returned by this Spliterator.  After invoking this method,
235	<	* the current Spliterator will <em>not</em> produce any of
272	<	* the elements of the returned Spliterator, but the two
273	<	* Spliterators together will produce all of the elements that
274	<	* would have been produced by this Spliterator had this
275	<	* method not been called. The exact number of elements
276	<	* produced by the returned Spliterator is not guaranteed, and
277	<	* may be zero (i.e., with {@code hasNext()} reporting {@code
278	<	* false}) if this Spliterator cannot be further split.
279	<	*
280	<	* @return a Spliterator covering approximately half of the
281	<	* elements
282	<	* @throws IllegalStateException if this Spliterator has
283	<	* already commenced traversing elements
232	>	* If possible, returns a new spliterator covering
233	>	* approximately one half of the elements, which will not be
234	>	* covered by this spliterator. Returns null if cannot be
235	>	* split.
236		*/
237	<	Spliterator<T> split();
237	>	ConcurrentHashMapSpliterator<T> trySplit();
238	>	/**
239	>	* Returns an estimate of the number of elements covered by
240	>	* this Spliterator.
241	>	*/
242	>	long estimateSize();
243	>
244	>	/** Applies the action to each untraversed element */
245	>	void forEachRemaining(Action<? super T> action);
246	>	/** If an element remains, applies the action and returns true. */
247	>	boolean tryAdvance(Action<? super T> action);
248		}
249
250	+	// Sams
251	+	/** Interface describing a void action of one argument */
252	+	public interface Action<A> { void apply(A a); }
253	+	/** Interface describing a void action of two arguments */
254	+	public interface BiAction<A,B> { void apply(A a, B b); }
255	+	/** Interface describing a function of one argument */
256	+	public interface Fun<A,T> { T apply(A a); }
257	+	/** Interface describing a function of two arguments */
258	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
259	+	/** Interface describing a function mapping its argument to a double */
260	+	public interface ObjectToDouble<A> { double apply(A a); }
261	+	/** Interface describing a function mapping its argument to a long */
262	+	public interface ObjectToLong<A> { long apply(A a); }
263	+	/** Interface describing a function mapping its argument to an int */
264	+	public interface ObjectToInt<A> {int apply(A a); }
265	+	/** Interface describing a function mapping two arguments to a double */
266	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
267	+	/** Interface describing a function mapping two arguments to a long */
268	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
269	+	/** Interface describing a function mapping two arguments to an int */
270	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
271	+	/** Interface describing a function mapping two doubles to a double */
272	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
273	+	/** Interface describing a function mapping two longs to a long */
274	+	public interface LongByLongToLong { long apply(long a, long b); }
275	+	/** Interface describing a function mapping two ints to an int */
276	+	public interface IntByIntToInt { int apply(int a, int b); }
277	+
278		/*
279		* Overview:
280		*
#	Line 295 | Line 285 | public class ConcurrentHashMapV8<K, V>
285		* the same or better than java.util.HashMap, and to support high
286		* initial insertion rates on an empty table by many threads.
287		*
288	<	* Each key-value mapping is held in a Node.  Because Node fields
289	<	* can contain special values, they are defined using plain Object
290	<	* types. Similarly in turn, all internal methods that use them
291	<	* work off Object types. And similarly, so do the internal
292	<	* methods of auxiliary iterator and view classes. This also
293	<	* allows many of the public methods to be factored into a smaller
294	<	* number of internal methods (although sadly not so for the five
295	<	* variants of put-related operations). The validation-based
296	<	* approach explained below leads to a lot of code sprawl because
297	<	* retry-control precludes factoring into smaller methods.
288	>	* This map usually acts as a binned (bucketed) hash table.  Each
289	>	* key-value mapping is held in a Node.  Most nodes are instances
290	>	* of the basic Node class with hash, key, value, and next
291	>	* fields. However, various subclasses exist: TreeNodes are
292	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
293	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
294	>	* of bins during resizing. ReservationNodes are used as
295	>	* placeholders while establishing values in computeIfAbsent and
296	>	* related methods.  The types TreeBin, ForwardingNode, and
297	>	* ReservationNode do not hold normal user keys, values, or
298	>	* hashes, and are readily distinguishable during search etc
299	>	* because they have negative hash fields and null key and value
300	>	* fields. (These special nodes are either uncommon or transient,
301	>	* so the impact of carrying around some unused fields is
302	>	* insignificant.)
303		*
304		* The table is lazily initialized to a power-of-two size upon the
305		* first insertion.  Each bin in the table normally contains a
#	Line 312 | Line 307 | public class ConcurrentHashMapV8<K, V>
307		* Table accesses require volatile/atomic reads, writes, and
308		* CASes.  Because there is no other way to arrange this without
309		* adding further indirections, we use intrinsics
310	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
316	<	* are always accurately traversable under volatile reads, so long
317	<	* as lookups check hash code and non-nullness of value before
318	<	* checking key equality.
310	>	* (sun.misc.Unsafe) operations.
311		*
312		* We use the top (sign) bit of Node hash fields for control
313		* purposes -- it is available anyway because of addressing
314	<	* constraints.  Nodes with negative hash fields are forwarding
315	<	* nodes to either TreeBins or resized tables.  The lower 31 bits
324	<	* of each normal Node's hash field contain a transformation of
325	<	* the key's hash code.
314	>	* constraints.  Nodes with negative hash fields are specially
315	>	* handled or ignored in map methods.
316		*
317		* Insertion (via put or its variants) of the first node in an
318		* empty bin is performed by just CASing it to the bin.  This is
#	Line 339 | Line 329 | public class ConcurrentHashMapV8<K, V>
329		* validate that it is still the first node after locking it, and
330		* retry if not. Because new nodes are always appended to lists,
331		* once a node is first in a bin, it remains first until deleted
332	<	* or the bin becomes invalidated (upon resizing).  However,
343	<	* operations that only conditionally update may inspect nodes
344	<	* until the point of update. This is a converse of sorts to the
345	<	* lazy locking technique described by Herlihy & Shavit.
332	>	* or the bin becomes invalidated (upon resizing).
333		*
334		* The main disadvantage of per-bin locks is that other update
335		* operations on other nodes in a bin list protected by the same
#	Line 375 | Line 362 | public class ConcurrentHashMapV8<K, V>
362		* sometimes deviate significantly from uniform randomness.  This
363		* includes the case when N > (1<<30), so some keys MUST collide.
364		* Similarly for dumb or hostile usages in which multiple keys are
365	<	* designed to have identical hash codes. Also, although we guard
366	<	* against the worst effects of this (see method spread), sets of
367	<	* hashes may differ only in bits that do not impact their bin
368	<	* index for a given power-of-two mask.  So we use a secondary
369	<	* strategy that applies when the number of nodes in a bin exceeds
370	<	* a threshold, and at least one of the keys implements
384	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
385	<	* (a specialized form of red-black trees), bounding search time
386	<	* to O(log N).  Each search step in a TreeBin is around twice as
365	>	* designed to have identical hash codes or ones that differs only
366	>	* in masked-out high bits. So we use a secondary strategy that
367	>	* applies when the number of nodes in a bin exceeds a
368	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
369	>	* specialized form of red-black trees), bounding search time to
370	>	* O(log N).  Each search step in a TreeBin is at least twice as
371		* slow as in a regular list, but given that N cannot exceed
372		* (1<<64) (before running out of addresses) this bounds search
373		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 456 | Line 440 | public class ConcurrentHashMapV8<K, V>
440		* bin already holding two or more nodes. Under uniform hash
441		* distributions, the probability of this occurring at threshold
442		* is around 13%, meaning that only about 1 in 8 puts check
443	<	* threshold (and after resizing, many fewer do so). The bulk
444	<	* putAll operation further reduces contention by only committing
445	<	* count updates upon these size checks.
443	>	* threshold (and after resizing, many fewer do so).
444	>	*
445	>	* TreeBins use a special form of comparison for search and
446	>	* related operations (which is the main reason we cannot use
447	>	* existing collections such as TreeMaps). TreeBins contain
448	>	* Comparable elements, but may contain others, as well as
449	>	* elements that are Comparable but not necessarily Comparable
450	>	* for the same T, so we cannot invoke compareTo among them. To
451	>	* handle this, the tree is ordered primarily by hash value, then
452	>	* by Comparable.compareTo order if applicable.  On lookup at a
453	>	* node, if elements are not comparable or compare as 0 then both
454	>	* left and right children may need to be searched in the case of
455	>	* tied hash values. (This corresponds to the full list search
456	>	* that would be necessary if all elements were non-Comparable and
457	>	* had tied hashes.)  The red-black balancing code is updated from
458	>	* pre-jdk-collections
459	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
460	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
461	>	* Algorithms" (CLR).
462	>	*
463	>	* TreeBins also require an additional locking mechanism.  While
464	>	* list traversal is always possible by readers even during
465	>	* updates, tree traversal is not, mainly because of tree-rotations
466	>	* that may change the root node and/or its linkages.  TreeBins
467	>	* include a simple read-write lock mechanism parasitic on the
468	>	* main bin-synchronization strategy: Structural adjustments
469	>	* associated with an insertion or removal are already bin-locked
470	>	* (and so cannot conflict with other writers) but must wait for
471	>	* ongoing readers to finish. Since there can be only one such
472	>	* waiter, we use a simple scheme using a single "waiter" field to
473	>	* block writers.  However, readers need never block.  If the root
474	>	* lock is held, they proceed along the slow traversal path (via
475	>	* next-pointers) until the lock becomes available or the list is
476	>	* exhausted, whichever comes first. These cases are not fast, but
477	>	* maximize aggregate expected throughput.
478		*
479		* Maintaining API and serialization compatibility with previous
480		* versions of this class introduces several oddities. Mainly: We
#	Line 468 | Line 484 | public class ConcurrentHashMapV8<K, V>
484		* time that we can guarantee to honor it.) We also declare an
485		* unused "Segment" class that is instantiated in minimal form
486		* only when serializing.
487	+	*
488	+	* This file is organized to make things a little easier to follow
489	+	* while reading than they might otherwise: First the main static
490	+	* declarations and utilities, then fields, then main public
491	+	* methods (with a few factorings of multiple public methods into
492	+	* internal ones), then sizing methods, trees, traversers, and
493	+	* bulk operations.
494		*/
495
496		/* ---------------- Constants -------------- */
#	Line 510 | Line 533 | public class ConcurrentHashMapV8<K, V>
533
534		/**
535		* The bin count threshold for using a tree rather than list for a
536	<	* bin.  The value reflects the approximate break-even point for
537	<	* using tree-based operations.
536	>	* bin.  Bins are converted to trees when adding an element to a
537	>	* bin with at least this many nodes. The value must be greater
538	>	* than 2, and should be at least 8 to mesh with assumptions in
539	>	* tree removal about conversion back to plain bins upon
540	>	* shrinkage.
541	>	*/
542	>	static final int TREEIFY_THRESHOLD = 8;
543	>
544	>	/**
545	>	* The bin count threshold for untreeifying a (split) bin during a
546	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
547	>	* most 6 to mesh with shrinkage detection under removal.
548		*/
549	<	private static final int TREE_THRESHOLD = 8;
549	>	static final int UNTREEIFY_THRESHOLD = 6;
550	>
551	>	/**
552	>	* The smallest table capacity for which bins may be treeified.
553	>	* (Otherwise the table is resized if too many nodes in a bin.)
554	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
555	>	* conflicts between resizing and treeification thresholds.
556	>	*/
557	>	static final int MIN_TREEIFY_CAPACITY = 64;
558
559		/**
560		* Minimum number of rebinnings per transfer step. Ranges are
#	Line 527 | Line 568 | public class ConcurrentHashMapV8<K, V>
568		/*
569		* Encodings for Node hash fields. See above for explanation.
570		*/
571	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
571	>	static final int MOVED     = -1; // hash for forwarding nodes
572	>	static final int TREEBIN   = -2; // hash for roots of trees
573	>	static final int RESERVED  = -3; // hash for transient reservations
574		static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
575
576		/** Number of CPUS, to place bounds on some sizings */
577		static final int NCPU = Runtime.getRuntime().availableProcessors();
578
579	<	/* ---------------- Counters -------------- */
579	>	/** For serialization compatibility. */
580	>	private static final ObjectStreamField[] serialPersistentFields = {
581	>	new ObjectStreamField("segments", Segment[].class),
582	>	new ObjectStreamField("segmentMask", Integer.TYPE),
583	>	new ObjectStreamField("segmentShift", Integer.TYPE)
584	>	};
585
586	<	// Adapted from LongAdder and Striped64.
539	<	// See their internal docs for explanation.
586	>	/* ---------------- Nodes -------------- */
587
588	<	// A padded cell for distributing counts
589	<	static final class CounterCell {
590	<	volatile long p0, p1, p2, p3, p4, p5, p6;
591	<	volatile long value;
592	<	volatile long q0, q1, q2, q3, q4, q5, q6;
593	<	CounterCell(long x) { value = x; }
588	>	/**
589	>	* Key-value entry.  This class is never exported out as a
590	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
591	>	* MapEntry below), but can be used for read-only traversals used
592	>	* in bulk tasks.  Subclasses of Node with a negative hash field
593	>	* are special, and contain null keys and values (but are never
594	>	* exported).  Otherwise, keys and vals are never null.
595	>	*/
596	>	static class Node<K,V> implements Map.Entry<K,V> {
597	>	final int hash;
598	>	final K key;
599	>	volatile V val;
600	>	volatile Node<K,V> next;
601	>
602	>	Node(int hash, K key, V val, Node<K,V> next) {
603	>	this.hash = hash;
604	>	this.key = key;
605	>	this.val = val;
606	>	this.next = next;
607	>	}
608	>
609	>	public final K getKey()       { return key; }
610	>	public final V getValue()     { return val; }
611	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
612	>	public final String toString(){ return key + "=" + val; }
613	>	public final V setValue(V value) {
614	>	throw new UnsupportedOperationException();
615	>	}
616	>
617	>	public final boolean equals(Object o) {
618	>	Object k, v, u; Map.Entry<?,?> e;
619	>	return ((o instanceof Map.Entry) &&
620	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
621	>	(v = e.getValue()) != null &&
622	>	(k == key || k.equals(key)) &&
623	>	(v == (u = val) || v.equals(u)));
624	>	}
625	>
626	>	/**
627	>	* Virtualized support for map.get(); overridden in subclasses.
628	>	*/
629	>	Node<K,V> find(int h, Object k) {
630	>	Node<K,V> e = this;
631	>	if (k != null) {
632	>	do {
633	>	K ek;
634	>	if (e.hash == h &&
635	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
636	>	return e;
637	>	} while ((e = e.next) != null);
638	>	}
639	>	return null;
640	>	}
641		}
642
643	+	/* ---------------- Static utilities -------------- */
644	+
645		/**
646	<	* Holder for the thread-local hash code determining which
647	<	* CounterCell to use. The code is initialized via the
648	<	* counterHashCodeGenerator, but may be moved upon collisions.
646	>	* Spreads (XORs) higher bits of hash to lower and also forces top
647	>	* bit to 0. Because the table uses power-of-two masking, sets of
648	>	* hashes that vary only in bits above the current mask will
649	>	* always collide. (Among known examples are sets of Float keys
650	>	* holding consecutive whole numbers in small tables.)  So we
651	>	* apply a transform that spreads the impact of higher bits
652	>	* downward. There is a tradeoff between speed, utility, and
653	>	* quality of bit-spreading. Because many common sets of hashes
654	>	* are already reasonably distributed (so don't benefit from
655	>	* spreading), and because we use trees to handle large sets of
656	>	* collisions in bins, we just XOR some shifted bits in the
657	>	* cheapest possible way to reduce systematic lossage, as well as
658	>	* to incorporate impact of the highest bits that would otherwise
659	>	* never be used in index calculations because of table bounds.
660		*/
661	<	static final class CounterHashCode {
662	<	int code;
661	>	static final int spread(int h) {
662	>	return (h ^ (h >>> 16)) & HASH_BITS;
663		}
664
665		/**
666	<	* Generates initial value for per-thread CounterHashCodes
666	>	* Returns a power of two table size for the given desired capacity.
667	>	* See Hackers Delight, sec 3.2
668		*/
669	<	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
669	>	private static final int tableSizeFor(int c) {
670	>	int n = c - 1;
671	>	n |= n >>> 1;
672	>	n |= n >>> 2;
673	>	n |= n >>> 4;
674	>	n |= n >>> 8;
675	>	n |= n >>> 16;
676	>	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
677	>	}
678
679		/**
680	<	* Increment for counterHashCodeGenerator. See class ThreadLocal
681	<	* for explanation.
680	>	* Returns x's Class if it is of the form "class C implements
681	>	* Comparable<C>", else null.
682		*/
683	<	static final int SEED_INCREMENT = 0x61c88647;
683	>	static Class<?> comparableClassFor(Object x) {
684	>	if (x instanceof Comparable) {
685	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
686	>	if ((c = x.getClass()) == String.class) // bypass checks
687	>	return c;
688	>	if ((ts = c.getGenericInterfaces()) != null) {
689	>	for (int i = 0; i < ts.length; ++i) {
690	>	if (((t = ts[i]) instanceof ParameterizedType) &&
691	>	((p = (ParameterizedType)t).getRawType() ==
692	>	Comparable.class) &&
693	>	(as = p.getActualTypeArguments()) != null &&
694	>	as.length == 1 && as[0] == c) // type arg is c
695	>	return c;
696	>	}
697	>	}
698	>	}
699	>	return null;
700	>	}
701
702		/**
703	<	* Per-thread counter hash codes. Shared across all instances
703	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
704	>	* class), else 0.
705		*/
706	<	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
707	<	new ThreadLocal<CounterHashCode>();
706	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
707	>	static int compareComparables(Class<?> kc, Object k, Object x) {
708	>	return (x == null || x.getClass() != kc ? 0 :
709	>	((Comparable)k).compareTo(x));
710	>	}
711	>
712	>	/* ---------------- Table element access -------------- */
713	>
714	>	/*
715	>	* Volatile access methods are used for table elements as well as
716	>	* elements of in-progress next table while resizing.  All uses of
717	>	* the tab arguments must be null checked by callers.  All callers
718	>	* also paranoically precheck that tab's length is not zero (or an
719	>	* equivalent check), thus ensuring that any index argument taking
720	>	* the form of a hash value anded with (length - 1) is a valid
721	>	* index.  Note that, to be correct wrt arbitrary concurrency
722	>	* errors by users, these checks must operate on local variables,
723	>	* which accounts for some odd-looking inline assignments below.
724	>	* Note that calls to setTabAt always occur within locked regions,
725	>	* and so in principle require only release ordering, not need
726	>	* full volatile semantics, but are currently coded as volatile
727	>	* writes to be conservative.
728	>	*/
729	>
730	>	@SuppressWarnings("unchecked")
731	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
732	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
733	>	}
734	>
735	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
736	>	Node<K,V> c, Node<K,V> v) {
737	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
738	>	}
739	>
740	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
741	>	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
742	>	}
743
744		/* ---------------- Fields -------------- */
745
#	Line 578 | Line 747 | public class ConcurrentHashMapV8<K, V>
747		* The array of bins. Lazily initialized upon first insertion.
748		* Size is always a power of two. Accessed directly by iterators.
749		*/
750	<	transient volatile Node[] table;
750	>	transient volatile Node<K,V>[] table;
751
752		/**
753		* The next table to use; non-null only while resizing.
754		*/
755	<	private transient volatile Node[] nextTable;
755	>	private transient volatile Node<K,V>[] nextTable;
756
757		/**
758		* Base counter value, used mainly when there is no contention,
#	Line 613 | Line 782 | public class ConcurrentHashMapV8<K, V>
782		private transient volatile int transferOrigin;
783
784		/**
785	<	* Spinlock (locked via CAS) used when resizing and/or creating Cells.
785	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
786		*/
787	<	private transient volatile int counterBusy;
787	>	private transient volatile int cellsBusy;
788
789		/**
790		* Table of counter cells. When non-null, size is a power of 2.
#	Line 627 | Line 796 | public class ConcurrentHashMapV8<K, V>
796		private transient ValuesView<K,V> values;
797		private transient EntrySetView<K,V> entrySet;
798
630	–	/** For serialization compatibility. Null unless serialized; see below */
631	–	private Segment<K,V>[] segments;
799
800	<	/* ---------------- Table element access -------------- */
800	>	/* ---------------- Public operations -------------- */
801
802	<	/*
803	<	* Volatile access methods are used for table elements as well as
637	<	* elements of in-progress next table while resizing.  Uses are
638	<	* null checked by callers, and implicitly bounds-checked, relying
639	<	* on the invariants that tab arrays have non-zero size, and all
640	<	* indices are masked with (tab.length - 1) which is never
641	<	* negative and always less than length. Note that, to be correct
642	<	* wrt arbitrary concurrency errors by users, bounds checks must
643	<	* operate on local variables, which accounts for some odd-looking
644	<	* inline assignments below.
802	>	/**
803	>	* Creates a new, empty map with the default initial table size (16).
804		*/
805	<
647	<	static final Node tabAt(Node[] tab, int i) { // used by Traverser
648	<	return (Node)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
805	>	public ConcurrentHashMapV8() {
806		}
807
808	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
809	<	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
808	>	/**
809	>	* Creates a new, empty map with an initial table size
810	>	* accommodating the specified number of elements without the need
811	>	* to dynamically resize.
812	>	*
813	>	* @param initialCapacity The implementation performs internal
814	>	* sizing to accommodate this many elements.
815	>	* @throws IllegalArgumentException if the initial capacity of
816	>	* elements is negative
817	>	*/
818	>	public ConcurrentHashMapV8(int initialCapacity) {
819	>	if (initialCapacity < 0)
820	>	throw new IllegalArgumentException();
821	>	int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
822	>	MAXIMUM_CAPACITY :
823	>	tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
824	>	this.sizeCtl = cap;
825		}
826
827	<	private static final void setTabAt(Node[] tab, int i, Node v) {
828	<	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
827	>	/**
828	>	* Creates a new map with the same mappings as the given map.
829	>	*
830	>	* @param m the map
831	>	*/
832	>	public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
833	>	this.sizeCtl = DEFAULT_CAPACITY;
834	>	putAll(m);
835		}
836
659	–	/* ---------------- Nodes -------------- */
660	–
837		/**
838	<	* Key-value entry. Note that this is never exported out as a
839	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
840	<	* field of MOVED are special, and do not contain user keys or
841	<	* values.  Otherwise, keys are never null, and null val fields
842	<	* indicate that a node is in the process of being deleted or
843	<	* created. For purposes of read-only access, a key may be read
844	<	* before a val, but can only be used after checking val to be
845	<	* non-null.
838	>	* Creates a new, empty map with an initial table size based on
839	>	* the given number of elements ({@code initialCapacity}) and
840	>	* initial table density ({@code loadFactor}).
841	>	*
842	>	* @param initialCapacity the initial capacity. The implementation
843	>	* performs internal sizing to accommodate this many elements,
844	>	* given the specified load factor.
845	>	* @param loadFactor the load factor (table density) for
846	>	* establishing the initial table size
847	>	* @throws IllegalArgumentException if the initial capacity of
848	>	* elements is negative or the load factor is nonpositive
849	>	*
850	>	* @since 1.6
851		*/
852	<	static class Node {
853	<	final int hash;
854	<	final Object key;
674	<	volatile Object val;
675	<	volatile Node next;
852	>	public ConcurrentHashMapV8(int initialCapacity, float loadFactor) {
853	>	this(initialCapacity, loadFactor, 1);
854	>	}
855
856	<	Node(int hash, Object key, Object val, Node next) {
857	<	this.hash = hash;
858	<	this.key = key;
859	<	this.val = val;
860	<	this.next = next;
861	<	}
856	>	/**
857	>	* Creates a new, empty map with an initial table size based on
858	>	* the given number of elements ({@code initialCapacity}), table
859	>	* density ({@code loadFactor}), and number of concurrently
860	>	* updating threads ({@code concurrencyLevel}).
861	>	*
862	>	* @param initialCapacity the initial capacity. The implementation
863	>	* performs internal sizing to accommodate this many elements,
864	>	* given the specified load factor.
865	>	* @param loadFactor the load factor (table density) for
866	>	* establishing the initial table size
867	>	* @param concurrencyLevel the estimated number of concurrently
868	>	* updating threads. The implementation may use this value as
869	>	* a sizing hint.
870	>	* @throws IllegalArgumentException if the initial capacity is
871	>	* negative or the load factor or concurrencyLevel are
872	>	* nonpositive
873	>	*/
874	>	public ConcurrentHashMapV8(int initialCapacity,
875	>	float loadFactor, int concurrencyLevel) {
876	>	if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
877	>	throw new IllegalArgumentException();
878	>	if (initialCapacity < concurrencyLevel)   // Use at least as many bins
879	>	initialCapacity = concurrencyLevel;   // as estimated threads
880	>	long size = (long)(1.0 + (long)initialCapacity / loadFactor);
881	>	int cap = (size >= (long)MAXIMUM_CAPACITY) ?
882	>	MAXIMUM_CAPACITY : tableSizeFor((int)size);
883	>	this.sizeCtl = cap;
884		}
885
886	<	/* ---------------- TreeBins -------------- */
886	>	// Original (since JDK1.2) Map methods
887
888		/**
889	<	* Nodes for use in TreeBins
889	>	* {@inheritDoc}
890		*/
891	<	static final class TreeNode extends Node {
892	<	TreeNode parent;  // red-black tree links
893	<	TreeNode left;
894	<	TreeNode right;
895	<	TreeNode prev;    // needed to unlink next upon deletion
896	<	boolean red;
891	>	public int size() {
892	>	long n = sumCount();
893	>	return ((n < 0L) ? 0 :
894	>	(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
895	>	(int)n);
896	>	}
897
898	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
899	<	super(hash, key, val, next);
900	<	this.parent = parent;
901	<	}
898	>	/**
899	>	* {@inheritDoc}
900	>	*/
901	>	public boolean isEmpty() {
902	>	return sumCount() <= 0L; // ignore transient negative values
903		}
904
905		/**
906	<	* A specialized form of red-black tree for use in bins
907	<	* whose size exceeds a threshold.
906	>	* Returns the value to which the specified key is mapped,
907	>	* or {@code null} if this map contains no mapping for the key.
908		*
909	<	* TreeBins use a special form of comparison for search and
910	<	* related operations (which is the main reason we cannot use
911	<	* existing collections such as TreeMaps). TreeBins contain
912	<	* Comparable elements, but may contain others, as well as
711	<	* elements that are Comparable but not necessarily Comparable<T>
712	<	* for the same T, so we cannot invoke compareTo among them. To
713	<	* handle this, the tree is ordered primarily by hash value, then
714	<	* by getClass().getName() order, and then by Comparator order
715	<	* among elements of the same class.  On lookup at a node, if
716	<	* elements are not comparable or compare as 0, both left and
717	<	* right children may need to be searched in the case of tied hash
718	<	* values. (This corresponds to the full list search that would be
719	<	* necessary if all elements were non-Comparable and had tied
720	<	* hashes.)  The red-black balancing code is updated from
721	<	* pre-jdk-collections
722	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
723	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
724	<	* Algorithms" (CLR).
909	>	* <p>More formally, if this map contains a mapping from a key
910	>	* {@code k} to a value {@code v} such that {@code key.equals(k)},
911	>	* then this method returns {@code v}; otherwise it returns
912	>	* {@code null}.  (There can be at most one such mapping.)
913		*
914	<	* TreeBins also maintain a separate locking discipline than
727	<	* regular bins. Because they are forwarded via special MOVED
728	<	* nodes at bin heads (which can never change once established),
729	<	* we cannot use those nodes as locks. Instead, TreeBin
730	<	* extends AbstractQueuedSynchronizer to support a simple form of
731	<	* read-write lock. For update operations and table validation,
732	<	* the exclusive form of lock behaves in the same way as bin-head
733	<	* locks. However, lookups use shared read-lock mechanics to allow
734	<	* multiple readers in the absence of writers.  Additionally,
735	<	* these lookups do not ever block: While the lock is not
736	<	* available, they proceed along the slow traversal path (via
737	<	* next-pointers) until the lock becomes available or the list is
738	<	* exhausted, whichever comes first. (These cases are not fast,
739	<	* but maximize aggregate expected throughput.)  The AQS mechanics
740	<	* for doing this are straightforward.  The lock state is held as
741	<	* AQS getState().  Read counts are negative; the write count (1)
742	<	* is positive.  There are no signalling preferences among readers
743	<	* and writers. Since we don't need to export full Lock API, we
744	<	* just override the minimal AQS methods and use them directly.
914	>	* @throws NullPointerException if the specified key is null
915		*/
916	<	static final class TreeBin extends AbstractQueuedSynchronizer {
917	<	private static final long serialVersionUID = 2249069246763182397L;
918	<	transient TreeNode root;  // root of tree
919	<	transient TreeNode first; // head of next-pointer list
920	<
921	<	/* AQS overrides */
922	<	public final boolean isHeldExclusively() { return getState() > 0; }
923	<	public final boolean tryAcquire(int ignore) {
924	<	if (compareAndSetState(0, 1)) {
925	<	setExclusiveOwnerThread(Thread.currentThread());
926	<	return true;
927	<	}
928	<	return false;
929	<	}
930	<	public final boolean tryRelease(int ignore) {
761	<	setExclusiveOwnerThread(null);
762	<	setState(0);
763	<	return true;
764	<	}
765	<	public final int tryAcquireShared(int ignore) {
766	<	for (int c;;) {
767	<	if ((c = getState()) > 0)
768	<	return -1;
769	<	if (compareAndSetState(c, c -1))
770	<	return 1;
771	<	}
772	<	}
773	<	public final boolean tryReleaseShared(int ignore) {
774	<	int c;
775	<	do {} while (!compareAndSetState(c = getState(), c + 1));
776	<	return c == -1;
777	<	}
778	<
779	<	/** From CLR */
780	<	private void rotateLeft(TreeNode p) {
781	<	if (p != null) {
782	<	TreeNode r = p.right, pp, rl;
783	<	if ((rl = p.right = r.left) != null)
784	<	rl.parent = p;
785	<	if ((pp = r.parent = p.parent) == null)
786	<	root = r;
787	<	else if (pp.left == p)
788	<	pp.left = r;
789	<	else
790	<	pp.right = r;
791	<	r.left = p;
792	<	p.parent = r;
916	>	public V get(Object key) {
917	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
918	>	int h = spread(key.hashCode());
919	>	if ((tab = table) != null && (n = tab.length) > 0 &&
920	>	(e = tabAt(tab, (n - 1) & h)) != null) {
921	>	if ((eh = e.hash) == h) {
922	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
923	>	return e.val;
924	>	}
925	>	else if (eh < 0)
926	>	return (p = e.find(h, key)) != null ? p.val : null;
927	>	while ((e = e.next) != null) {
928	>	if (e.hash == h &&
929	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
930	>	return e.val;
931		}
932		}
933	+	return null;
934	+	}
935
936	<	/** From CLR */
937	<	private void rotateRight(TreeNode p) {
938	<	if (p != null) {
939	<	TreeNode l = p.left, pp, lr;
940	<	if ((lr = p.left = l.right) != null)
941	<	lr.parent = p;
942	<	if ((pp = l.parent = p.parent) == null)
943	<	root = l;
944	<	else if (pp.right == p)
945	<	pp.right = l;
946	<	else
947	<	pp.left = l;
808	<	l.right = p;
809	<	p.parent = l;
810	<	}
811	<	}
936	>	/**
937	>	* Tests if the specified object is a key in this table.
938	>	*
939	>	* @param  key possible key
940	>	* @return {@code true} if and only if the specified object
941	>	*         is a key in this table, as determined by the
942	>	*         {@code equals} method; {@code false} otherwise
943	>	* @throws NullPointerException if the specified key is null
944	>	*/
945	>	public boolean containsKey(Object key) {
946	>	return get(key) != null;
947	>	}
948
949	<	/**
950	<	* Returns the TreeNode (or null if not found) for the given key
951	<	* starting at given root.
952	<	*/
953	<	@SuppressWarnings("unchecked") final TreeNode getTreeNode
954	<	(int h, Object k, TreeNode p) {
955	<	Class<?> c = k.getClass();
956	<	while (p != null) {
957	<	int dir, ph;  Object pk; Class<?> pc;
958	<	if ((ph = p.hash) == h) {
959	<	if ((pk = p.key) == k || k.equals(pk))
960	<	return p;
961	<	if (c != (pc = pk.getClass()) ||
962	<	!(k instanceof Comparable) ||
963	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
964	<	if ((dir = (c == pc) ? 0 :
965	<	c.getName().compareTo(pc.getName())) == 0) {
966	<	TreeNode r = null, pl, pr; // check both sides
967	<	if ((pr = p.right) != null && h >= pr.hash &&
968	<	(r = getTreeNode(h, k, pr)) != null)
833	<	return r;
834	<	else if ((pl = p.left) != null && h <= pl.hash)
835	<	dir = -1;
836	<	else // nothing there
837	<	return null;
838	<	}
839	<	}
840	<	}
841	<	else
842	<	dir = (h < ph) ? -1 : 1;
843	<	p = (dir > 0) ? p.right : p.left;
949	>	/**
950	>	* Returns {@code true} if this map maps one or more keys to the
951	>	* specified value. Note: This method may require a full traversal
952	>	* of the map, and is much slower than method {@code containsKey}.
953	>	*
954	>	* @param value value whose presence in this map is to be tested
955	>	* @return {@code true} if this map maps one or more keys to the
956	>	*         specified value
957	>	* @throws NullPointerException if the specified value is null
958	>	*/
959	>	public boolean containsValue(Object value) {
960	>	if (value == null)
961	>	throw new NullPointerException();
962	>	Node<K,V>[] t;
963	>	if ((t = table) != null) {
964	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
965	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
966	>	V v;
967	>	if ((v = p.val) == value || (v != null && value.equals(v)))
968	>	return true;
969		}
845	–	return null;
970		}
971	+	return false;
972	+	}
973
974	<	/**
975	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
976	<	* read-lock to call getTreeNode, but during failure to get
977	<	* lock, searches along next links.
978	<	*/
979	<	final Object getValue(int h, Object k) {
980	<	Node r = null;
981	<	int c = getState(); // Must read lock state first
982	<	for (Node e = first; e != null; e = e.next) {
983	<	if (c <= 0 && compareAndSetState(c, c - 1)) {
984	<	try {
985	<	r = getTreeNode(h, k, root);
986	<	} finally {
987	<	releaseShared(0);
974	>	/**
975	>	* Maps the specified key to the specified value in this table.
976	>	* Neither the key nor the value can be null.
977	>	*
978	>	* <p>The value can be retrieved by calling the {@code get} method
979	>	* with a key that is equal to the original key.
980	>	*
981	>	* @param key key with which the specified value is to be associated
982	>	* @param value value to be associated with the specified key
983	>	* @return the previous value associated with {@code key}, or
984	>	*         {@code null} if there was no mapping for {@code key}
985	>	* @throws NullPointerException if the specified key or value is null
986	>	*/
987	>	public V put(K key, V value) {
988	>	return putVal(key, value, false);
989	>	}
990	>
991	>	/** Implementation for put and putIfAbsent */
992	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
993	>	if (key == null || value == null) throw new NullPointerException();
994	>	int hash = spread(key.hashCode());
995	>	int binCount = 0;
996	>	for (Node<K,V>[] tab = table;;) {
997	>	Node<K,V> f; int n, i, fh;
998	>	if (tab == null || (n = tab.length) == 0)
999	>	tab = initTable();
1000	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
1001	>	if (casTabAt(tab, i, null,
1002	>	new Node<K,V>(hash, key, value, null)))
1003	>	break;                   // no lock when adding to empty bin
1004	>	}
1005	>	else if ((fh = f.hash) == MOVED)
1006	>	tab = helpTransfer(tab, f);
1007	>	else {
1008	>	V oldVal = null;
1009	>	synchronized (f) {
1010	>	if (tabAt(tab, i) == f) {
1011	>	if (fh >= 0) {
1012	>	binCount = 1;
1013	>	for (Node<K,V> e = f;; ++binCount) {
1014	>	K ek;
1015	>	if (e.hash == hash &&
1016	>	((ek = e.key) == key ||
1017	>	(ek != null && key.equals(ek)))) {
1018	>	oldVal = e.val;
1019	>	if (!onlyIfAbsent)
1020	>	e.val = value;
1021	>	break;
1022	>	}
1023	>	Node<K,V> pred = e;
1024	>	if ((e = e.next) == null) {
1025	>	pred.next = new Node<K,V>(hash, key,
1026	>	value, null);
1027	>	break;
1028	>	}
1029	>	}
1030	>	}
1031	>	else if (f instanceof TreeBin) {
1032	>	Node<K,V> p;
1033	>	binCount = 2;
1034	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1035	>	value)) != null) {
1036	>	oldVal = p.val;
1037	>	if (!onlyIfAbsent)
1038	>	p.val = value;
1039	>	}
1040	>	}
1041		}
863	–	break;
1042		}
1043	<	else if (e.hash == h && k.equals(e.key)) {
1044	<	r = e;
1043	>	if (binCount != 0) {
1044	>	if (binCount >= TREEIFY_THRESHOLD)
1045	>	treeifyBin(tab, i);
1046	>	if (oldVal != null)
1047	>	return oldVal;
1048		break;
1049		}
869	–	else
870	–	c = getState();
1050		}
872	–	return r == null ? null : r.val;
1051		}
1052	+	addCount(1L, binCount);
1053	+	return null;
1054	+	}
1055
1056	<	/**
1057	<	* Finds or adds a node.
1058	<	* @return null if added
1059	<	*/
1060	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
1061	<	(int h, Object k, Object v) {
1062	<	Class<?> c = k.getClass();
1063	<	TreeNode pp = root, p = null;
1064	<	int dir = 0;
1065	<	while (pp != null) { // find existing node or leaf to insert at
1066	<	int ph;  Object pk; Class<?> pc;
1067	<	p = pp;
887	<	if ((ph = p.hash) == h) {
888	<	if ((pk = p.key) == k || k.equals(pk))
889	<	return p;
890	<	if (c != (pc = pk.getClass()) ||
891	<	!(k instanceof Comparable) ||
892	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
893	<	TreeNode s = null, r = null, pr;
894	<	if ((dir = (c == pc) ? 0 :
895	<	c.getName().compareTo(pc.getName())) == 0) {
896	<	if ((pr = p.right) != null && h >= pr.hash &&
897	<	(r = getTreeNode(h, k, pr)) != null)
898	<	return r;
899	<	else // continue left
900	<	dir = -1;
901	<	}
902	<	else if ((pr = p.right) != null && h >= pr.hash)
903	<	s = pr;
904	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
905	<	return r;
906	<	}
907	<	}
908	<	else
909	<	dir = (h < ph) ? -1 : 1;
910	<	pp = (dir > 0) ? p.right : p.left;
911	<	}
1056	>	/**
1057	>	* Copies all of the mappings from the specified map to this one.
1058	>	* These mappings replace any mappings that this map had for any of the
1059	>	* keys currently in the specified map.
1060	>	*
1061	>	* @param m mappings to be stored in this map
1062	>	*/
1063	>	public void putAll(Map<? extends K, ? extends V> m) {
1064	>	tryPresize(m.size());
1065	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1066	>	putVal(e.getKey(), e.getValue(), false);
1067	>	}
1068
1069	<	TreeNode f = first;
1070	<	TreeNode x = first = new TreeNode(h, k, v, f, p);
1071	<	if (p == null)
1072	<	root = x;
1073	<	else { // attach and rebalance; adapted from CLR
1074	<	TreeNode xp, xpp;
1075	<	if (f != null)
1076	<	f.prev = x;
1077	<	if (dir <= 0)
1078	<	p.left = x;
1079	<	else
1080	<	p.right = x;
1081	<	x.red = true;
1082	<	while (x != null && (xp = x.parent) != null && xp.red &&
1083	<	(xpp = xp.parent) != null) {
1084	<	TreeNode xppl = xpp.left;
1085	<	if (xp == xppl) {
1086	<	TreeNode y = xpp.right;
1087	<	if (y != null && y.red) {
1088	<	y.red = false;
1089	<	xp.red = false;
1090	<	xpp.red = true;
1091	<	x = xpp;
1092	<	}
1093	<	else {
1094	<	if (x == xp.right) {
1095	<	rotateLeft(x = xp);
1096	<	xpp = (xp = x.parent) == null ? null : xp.parent;
1097	<	}
1098	<	if (xp != null) {
1099	<	xp.red = false;
1100	<	if (xpp != null) {
1101	<	xpp.red = true;
1102	<	rotateRight(xpp);
1069	>	/**
1070	>	* Removes the key (and its corresponding value) from this map.
1071	>	* This method does nothing if the key is not in the map.
1072	>	*
1073	>	* @param  key the key that needs to be removed
1074	>	* @return the previous value associated with {@code key}, or
1075	>	*         {@code null} if there was no mapping for {@code key}
1076	>	* @throws NullPointerException if the specified key is null
1077	>	*/
1078	>	public V remove(Object key) {
1079	>	return replaceNode(key, null, null);
1080	>	}
1081	>
1082	>	/**
1083	>	* Implementation for the four public remove/replace methods:
1084	>	* Replaces node value with v, conditional upon match of cv if
1085	>	* non-null.  If resulting value is null, delete.
1086	>	*/
1087	>	final V replaceNode(Object key, V value, Object cv) {
1088	>	int hash = spread(key.hashCode());
1089	>	for (Node<K,V>[] tab = table;;) {
1090	>	Node<K,V> f; int n, i, fh;
1091	>	if (tab == null || (n = tab.length) == 0 ||
1092	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1093	>	break;
1094	>	else if ((fh = f.hash) == MOVED)
1095	>	tab = helpTransfer(tab, f);
1096	>	else {
1097	>	V oldVal = null;
1098	>	boolean validated = false;
1099	>	synchronized (f) {
1100	>	if (tabAt(tab, i) == f) {
1101	>	if (fh >= 0) {
1102	>	validated = true;
1103	>	for (Node<K,V> e = f, pred = null;;) {
1104	>	K ek;
1105	>	if (e.hash == hash &&
1106	>	((ek = e.key) == key ||
1107	>	(ek != null && key.equals(ek)))) {
1108	>	V ev = e.val;
1109	>	if (cv == null || cv == ev ||
1110	>	(ev != null && cv.equals(ev))) {
1111	>	oldVal = ev;
1112	>	if (value != null)
1113	>	e.val = value;
1114	>	else if (pred != null)
1115	>	pred.next = e.next;
1116	>	else
1117	>	setTabAt(tab, i, e.next);
1118	>	}
1119	>	break;
1120		}
1121	+	pred = e;
1122	+	if ((e = e.next) == null)
1123	+	break;
1124		}
1125		}
1126	<	}
1127	<	else {
1128	<	TreeNode y = xppl;
1129	<	if (y != null && y.red) {
1130	<	y.red = false;
1131	<	xp.red = false;
1132	<	xpp.red = true;
1133	<	x = xpp;
1134	<	}
1135	<	else {
1136	<	if (x == xp.left) {
1137	<	rotateRight(x = xp);
1138	<	xpp = (xp = x.parent) == null ? null : xp.parent;
1139	<	}
964	<	if (xp != null) {
965	<	xp.red = false;
966	<	if (xpp != null) {
967	<	xpp.red = true;
968	<	rotateLeft(xpp);
1126	>	else if (f instanceof TreeBin) {
1127	>	validated = true;
1128	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1129	>	TreeNode<K,V> r, p;
1130	>	if ((r = t.root) != null &&
1131	>	(p = r.findTreeNode(hash, key, null)) != null) {
1132	>	V pv = p.val;
1133	>	if (cv == null || cv == pv ||
1134	>	(pv != null && cv.equals(pv))) {
1135	>	oldVal = pv;
1136	>	if (value != null)
1137	>	p.val = value;
1138	>	else if (t.removeTreeNode(p))
1139	>	setTabAt(tab, i, untreeify(t.first));
1140		}
1141		}
1142		}
1143		}
1144		}
1145	<	TreeNode r = root;
1146	<	if (r != null && r.red)
1147	<	r.red = false;
1148	<	}
1149	<	return null;
979	<	}
980	<
981	<	/**
982	<	* Removes the given node, that must be present before this
983	<	* call.  This is messier than typical red-black deletion code
984	<	* because we cannot swap the contents of an interior node
985	<	* with a leaf successor that is pinned by "next" pointers
986	<	* that are accessible independently of lock. So instead we
987	<	* swap the tree linkages.
988	<	*/
989	<	final void deleteTreeNode(TreeNode p) {
990	<	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
991	<	TreeNode pred = p.prev;
992	<	if (pred == null)
993	<	first = next;
994	<	else
995	<	pred.next = next;
996	<	if (next != null)
997	<	next.prev = pred;
998	<	TreeNode replacement;
999	<	TreeNode pl = p.left;
1000	<	TreeNode pr = p.right;
1001	<	if (pl != null && pr != null) {
1002	<	TreeNode s = pr, sl;
1003	<	while ((sl = s.left) != null) // find successor
1004	<	s = sl;
1005	<	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
1006	<	TreeNode sr = s.right;
1007	<	TreeNode pp = p.parent;
1008	<	if (s == pr) { // p was s's direct parent
1009	<	p.parent = s;
1010	<	s.right = p;
1011	<	}
1012	<	else {
1013	<	TreeNode sp = s.parent;
1014	<	if ((p.parent = sp) != null) {
1015	<	if (s == sp.left)
1016	<	sp.left = p;
1017	<	else
1018	<	sp.right = p;
1145	>	if (validated) {
1146	>	if (oldVal != null) {
1147	>	if (value == null)
1148	>	addCount(-1L, -1);
1149	>	return oldVal;
1150		}
1151	<	if ((s.right = pr) != null)
1021	<	pr.parent = s;
1151	>	break;
1152		}
1023	–	p.left = null;
1024	–	if ((p.right = sr) != null)
1025	–	sr.parent = p;
1026	–	if ((s.left = pl) != null)
1027	–	pl.parent = s;
1028	–	if ((s.parent = pp) == null)
1029	–	root = s;
1030	–	else if (p == pp.left)
1031	–	pp.left = s;
1032	–	else
1033	–	pp.right = s;
1034	–	replacement = sr;
1153		}
1154	<	else
1155	<	replacement = (pl != null) ? pl : pr;
1156	<	TreeNode pp = p.parent;
1157	<	if (replacement == null) {
1158	<	if (pp == null) {
1159	<	root = null;
1160	<	return;
1161	<	}
1162	<	replacement = p;
1154	>	}
1155	>	return null;
1156	>	}
1157	>
1158	>	/**
1159	>	* Removes all of the mappings from this map.
1160	>	*/
1161	>	public void clear() {
1162	>	long delta = 0L; // negative number of deletions
1163	>	int i = 0;
1164	>	Node<K,V>[] tab = table;
1165	>	while (tab != null && i < tab.length) {
1166	>	int fh;
1167	>	Node<K,V> f = tabAt(tab, i);
1168	>	if (f == null)
1169	>	++i;
1170	>	else if ((fh = f.hash) == MOVED) {
1171	>	tab = helpTransfer(tab, f);
1172	>	i = 0; // restart
1173		}
1174		else {
1175	<	replacement.parent = pp;
1176	<	if (pp == null)
1177	<	root = replacement;
1178	<	else if (p == pp.left)
1179	<	pp.left = replacement;
1180	<	else
1181	<	pp.right = replacement;
1182	<	p.left = p.right = p.parent = null;
1055	<	}
1056	<	if (!p.red) { // rebalance, from CLR
1057	<	TreeNode x = replacement;
1058	<	while (x != null) {
1059	<	TreeNode xp, xpl;
1060	<	if (x.red || (xp = x.parent) == null) {
1061	<	x.red = false;
1062	<	break;
1063	<	}
1064	<	if (x == (xpl = xp.left)) {
1065	<	TreeNode sib = xp.right;
1066	<	if (sib != null && sib.red) {
1067	<	sib.red = false;
1068	<	xp.red = true;
1069	<	rotateLeft(xp);
1070	<	sib = (xp = x.parent) == null ? null : xp.right;
1071	<	}
1072	<	if (sib == null)
1073	<	x = xp;
1074	<	else {
1075	<	TreeNode sl = sib.left, sr = sib.right;
1076	<	if ((sr == null || !sr.red) &&
1077	<	(sl == null || !sl.red)) {
1078	<	sib.red = true;
1079	<	x = xp;
1080	<	}
1081	<	else {
1082	<	if (sr == null || !sr.red) {
1083	<	if (sl != null)
1084	<	sl.red = false;
1085	<	sib.red = true;
1086	<	rotateRight(sib);
1087	<	sib = (xp = x.parent) == null ?
1088	<	null : xp.right;
1089	<	}
1090	<	if (sib != null) {
1091	<	sib.red = (xp == null) ? false : xp.red;
1092	<	if ((sr = sib.right) != null)
1093	<	sr.red = false;
1094	<	}
1095	<	if (xp != null) {
1096	<	xp.red = false;
1097	<	rotateLeft(xp);
1098	<	}
1099	<	x = root;
1100	<	}
1101	<	}
1102	<	}
1103	<	else { // symmetric
1104	<	TreeNode sib = xpl;
1105	<	if (sib != null && sib.red) {
1106	<	sib.red = false;
1107	<	xp.red = true;
1108	<	rotateRight(xp);
1109	<	sib = (xp = x.parent) == null ? null : xp.left;
1110	<	}
1111	<	if (sib == null)
1112	<	x = xp;
1113	<	else {
1114	<	TreeNode sl = sib.left, sr = sib.right;
1115	<	if ((sl == null || !sl.red) &&
1116	<	(sr == null || !sr.red)) {
1117	<	sib.red = true;
1118	<	x = xp;
1119	<	}
1120	<	else {
1121	<	if (sl == null || !sl.red) {
1122	<	if (sr != null)
1123	<	sr.red = false;
1124	<	sib.red = true;
1125	<	rotateLeft(sib);
1126	<	sib = (xp = x.parent) == null ?
1127	<	null : xp.left;
1128	<	}
1129	<	if (sib != null) {
1130	<	sib.red = (xp == null) ? false : xp.red;
1131	<	if ((sl = sib.left) != null)
1132	<	sl.red = false;
1133	<	}
1134	<	if (xp != null) {
1135	<	xp.red = false;
1136	<	rotateRight(xp);
1137	<	}
1138	<	x = root;
1139	<	}
1175	>	synchronized (f) {
1176	>	if (tabAt(tab, i) == f) {
1177	>	Node<K,V> p = (fh >= 0 ? f :
1178	>	(f instanceof TreeBin) ?
1179	>	((TreeBin<K,V>)f).first : null);
1180	>	while (p != null) {
1181	>	--delta;
1182	>	p = p.next;
1183		}
1184	+	setTabAt(tab, i++, null);
1185		}
1186		}
1187		}
1144	–	if (p == replacement && (pp = p.parent) != null) {
1145	–	if (p == pp.left) // detach pointers
1146	–	pp.left = null;
1147	–	else if (p == pp.right)
1148	–	pp.right = null;
1149	–	p.parent = null;
1150	–	}
1188		}
1189	+	if (delta != 0L)
1190	+	addCount(delta, -1);
1191		}
1192
1193	<	/* ---------------- Collision reduction methods -------------- */
1193	>	/**
1194	>	* Returns a {@link Set} view of the keys contained in this map.
1195	>	* The set is backed by the map, so changes to the map are
1196	>	* reflected in the set, and vice-versa. The set supports element
1197	>	* removal, which removes the corresponding mapping from this map,
1198	>	* via the {@code Iterator.remove}, {@code Set.remove},
1199	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1200	>	* operations.  It does not support the {@code add} or
1201	>	* {@code addAll} operations.
1202	>	*
1203	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1204	>	* that will never throw {@link ConcurrentModificationException},
1205	>	* and guarantees to traverse elements as they existed upon
1206	>	* construction of the iterator, and may (but is not guaranteed to)
1207	>	* reflect any modifications subsequent to construction.
1208	>	*
1209	>	* @return the set view
1210	>	*/
1211	>	public KeySetView<K,V> keySet() {
1212	>	KeySetView<K,V> ks;
1213	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1214	>	}
1215
1216		/**
1217	<	* Spreads higher bits to lower, and also forces top bit to 0.
1218	<	* Because the table uses power-of-two masking, sets of hashes
1219	<	* that vary only in bits above the current mask will always
1220	<	* collide. (Among known examples are sets of Float keys holding
1221	<	* consecutive whole numbers in small tables.)  To counter this,
1222	<	* we apply a transform that spreads the impact of higher bits
1223	<	* downward. There is a tradeoff between speed, utility, and
1224	<	* quality of bit-spreading. Because many common sets of hashes
1225	<	* are already reasonably distributed across bits (so don't benefit
1226	<	* from spreading), and because we use trees to handle large sets
1227	<	* of collisions in bins, we don't need excessively high quality.
1217	>	* Returns a {@link Collection} view of the values contained in this map.
1218	>	* The collection is backed by the map, so changes to the map are
1219	>	* reflected in the collection, and vice-versa.  The collection
1220	>	* supports element removal, which removes the corresponding
1221	>	* mapping from this map, via the {@code Iterator.remove},
1222	>	* {@code Collection.remove}, {@code removeAll},
1223	>	* {@code retainAll}, and {@code clear} operations.  It does not
1224	>	* support the {@code add} or {@code addAll} operations.
1225	>	*
1226	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1227	>	* that will never throw {@link ConcurrentModificationException},
1228	>	* and guarantees to traverse elements as they existed upon
1229	>	* construction of the iterator, and may (but is not guaranteed to)
1230	>	* reflect any modifications subsequent to construction.
1231	>	*
1232	>	* @return the collection view
1233		*/
1234	<	private static final int spread(int h) {
1235	<	h ^= (h >>> 18) ^ (h >>> 12);
1236	<	return (h ^ (h >>> 10)) & HASH_BITS;
1234	>	public Collection<V> values() {
1235	>	ValuesView<K,V> vs;
1236	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1237		}
1238
1239		/**
1240	<	* Replaces a list bin with a tree bin if key is comparable.  Call
1241	<	* only when locked.
1240	>	* Returns a {@link Set} view of the mappings contained in this map.
1241	>	* The set is backed by the map, so changes to the map are
1242	>	* reflected in the set, and vice-versa.  The set supports element
1243	>	* removal, which removes the corresponding mapping from the map,
1244	>	* via the {@code Iterator.remove}, {@code Set.remove},
1245	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1246	>	* operations.
1247	>	*
1248	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1249	>	* that will never throw {@link ConcurrentModificationException},
1250	>	* and guarantees to traverse elements as they existed upon
1251	>	* construction of the iterator, and may (but is not guaranteed to)
1252	>	* reflect any modifications subsequent to construction.
1253	>	*
1254	>	* @return the set view
1255		*/
1256	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
1257	<	if (key instanceof Comparable) {
1258	<	TreeBin t = new TreeBin();
1259	<	for (Node e = tabAt(tab, index); e != null; e = e.next)
1260	<	t.putTreeNode(e.hash, e.key, e.val);
1261	<	setTabAt(tab, index, new Node(MOVED, t, null, null));
1256	>	public Set<Map.Entry<K,V>> entrySet() {
1257	>	EntrySetView<K,V> es;
1258	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1259	>	}
1260	>
1261	>	/**
1262	>	* Returns the hash code value for this {@link Map}, i.e.,
1263	>	* the sum of, for each key-value pair in the map,
1264	>	* {@code key.hashCode() ^ value.hashCode()}.
1265	>	*
1266	>	* @return the hash code value for this map
1267	>	*/
1268	>	public int hashCode() {
1269	>	int h = 0;
1270	>	Node<K,V>[] t;
1271	>	if ((t = table) != null) {
1272	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1273	>	for (Node<K,V> p; (p = it.advance()) != null; )
1274	>	h += p.key.hashCode() ^ p.val.hashCode();
1275		}
1276	+	return h;
1277		}
1278
1279	<	/* ---------------- Internal access and update methods -------------- */
1279	>	/**
1280	>	* Returns a string representation of this map.  The string
1281	>	* representation consists of a list of key-value mappings (in no
1282	>	* particular order) enclosed in braces ("{@code {}}").  Adjacent
1283	>	* mappings are separated by the characters {@code ", "} (comma
1284	>	* and space).  Each key-value mapping is rendered as the key
1285	>	* followed by an equals sign ("{@code =}") followed by the
1286	>	* associated value.
1287	>	*
1288	>	* @return a string representation of this map
1289	>	*/
1290	>	public String toString() {
1291	>	Node<K,V>[] t;
1292	>	int f = (t = table) == null ? 0 : t.length;
1293	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1294	>	StringBuilder sb = new StringBuilder();
1295	>	sb.append('{');
1296	>	Node<K,V> p;
1297	>	if ((p = it.advance()) != null) {
1298	>	for (;;) {
1299	>	K k = p.key;
1300	>	V v = p.val;
1301	>	sb.append(k == this ? "(this Map)" : k);
1302	>	sb.append('=');
1303	>	sb.append(v == this ? "(this Map)" : v);
1304	>	if ((p = it.advance()) == null)
1305	>	break;
1306	>	sb.append(',').append(' ');
1307	>	}
1308	>	}
1309	>	return sb.append('}').toString();
1310	>	}
1311
1312	<	/** Implementation for get and containsKey */
1313	<	@SuppressWarnings("unchecked") private final V internalGet(Object k) {
1314	<	int h = spread(k.hashCode());
1315	<	retry: for (Node[] tab = table; tab != null;) {
1316	<	Node e; Object ek, ev; int eh;      // locals to read fields once
1317	<	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1318	<	if ((eh = e.hash) < 0) {
1319	<	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1320	<	return (V)((TreeBin)ek).getValue(h, k);
1321	<	else {                        // restart with new table
1322	<	tab = (Node[])ek;
1323	<	continue retry;
1324	<	}
1325	<	}
1326	<	else if (eh == h && (ev = e.val) != null &&
1327	<	((ek = e.key) == k || k.equals(ek)))
1328	<	return (V)ev;
1312	>	/**
1313	>	* Compares the specified object with this map for equality.
1314	>	* Returns {@code true} if the given object is a map with the same
1315	>	* mappings as this map.  This operation may return misleading
1316	>	* results if either map is concurrently modified during execution
1317	>	* of this method.
1318	>	*
1319	>	* @param o object to be compared for equality with this map
1320	>	* @return {@code true} if the specified object is equal to this map
1321	>	*/
1322	>	public boolean equals(Object o) {
1323	>	if (o != this) {
1324	>	if (!(o instanceof Map))
1325	>	return false;
1326	>	Map<?,?> m = (Map<?,?>) o;
1327	>	Node<K,V>[] t;
1328	>	int f = (t = table) == null ? 0 : t.length;
1329	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1330	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1331	>	V val = p.val;
1332	>	Object v = m.get(p.key);
1333	>	if (v == null || (v != val && !v.equals(val)))
1334	>	return false;
1335	>	}
1336	>	for (Map.Entry<?,?> e : m.entrySet()) {
1337	>	Object mk, mv, v;
1338	>	if ((mk = e.getKey()) == null ||
1339	>	(mv = e.getValue()) == null ||
1340	>	(v = get(mk)) == null ||
1341	>	(mv != v && !mv.equals(v)))
1342	>	return false;
1343		}
1207	–	break;
1344		}
1345	<	return null;
1345	>	return true;
1346		}
1347
1348		/**
1349	<	* Implementation for the four public remove/replace methods:
1350	<	* Replaces node value with v, conditional upon match of cv if
1215	<	* non-null.  If resulting value is null, delete.
1349	>	* Stripped-down version of helper class used in previous version,
1350	>	* declared for the sake of serialization compatibility
1351		*/
1352	<	@SuppressWarnings("unchecked") private final V internalReplace
1353	<	(Object k, V v, Object cv) {
1354	<	int h = spread(k.hashCode());
1355	<	Object oldVal = null;
1356	<	for (Node[] tab = table;;) {
1357	<	Node f; int i, fh; Object fk;
1358	<	if (tab == null ||
1359	<	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1360	<	break;
1361	<	else if ((fh = f.hash) < 0) {
1362	<	if ((fk = f.key) instanceof TreeBin) {
1363	<	TreeBin t = (TreeBin)fk;
1364	<	boolean validated = false;
1365	<	boolean deleted = false;
1366	<	t.acquire(0);
1367	<	try {
1368	<	if (tabAt(tab, i) == f) {
1369	<	validated = true;
1370	<	TreeNode p = t.getTreeNode(h, k, t.root);
1371	<	if (p != null) {
1372	<	Object pv = p.val;
1373	<	if (cv == null || cv == pv || cv.equals(pv)) {
1374	<	oldVal = pv;
1375	<	if ((p.val = v) == null) {
1376	<	deleted = true;
1377	<	t.deleteTreeNode(p);
1378	<	}
1379	<	}
1380	<	}
1381	<	}
1382	<	} finally {
1383	<	t.release(0);
1384	<	}
1385	<	if (validated) {
1386	<	if (deleted)
1387	<	addCount(-1L, -1);
1388	<	break;
1389	<	}
1390	<	}
1391	<	else
1392	<	tab = (Node[])fk;
1352	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1353	>	private static final long serialVersionUID = 2249069246763182397L;
1354	>	final float loadFactor;
1355	>	Segment(float lf) { this.loadFactor = lf; }
1356	>	}
1357	>
1358	>	/**
1359	>	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
1360	>	* stream (i.e., serializes it).
1361	>	* @param s the stream
1362	>	* @serialData
1363	>	* the key (Object) and value (Object)
1364	>	* for each key-value mapping, followed by a null pair.
1365	>	* The key-value mappings are emitted in no particular order.
1366	>	*/
1367	>	private void writeObject(java.io.ObjectOutputStream s)
1368	>	throws java.io.IOException {
1369	>	// For serialization compatibility
1370	>	// Emulate segment calculation from previous version of this class
1371	>	int sshift = 0;
1372	>	int ssize = 1;
1373	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1374	>	++sshift;
1375	>	ssize <<= 1;
1376	>	}
1377	>	int segmentShift = 32 - sshift;
1378	>	int segmentMask = ssize - 1;
1379	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1380	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1381	>	for (int i = 0; i < segments.length; ++i)
1382	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1383	>	s.putFields().put("segments", segments);
1384	>	s.putFields().put("segmentShift", segmentShift);
1385	>	s.putFields().put("segmentMask", segmentMask);
1386	>	s.writeFields();
1387	>
1388	>	Node<K,V>[] t;
1389	>	if ((t = table) != null) {
1390	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1391	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1392	>	s.writeObject(p.key);
1393	>	s.writeObject(p.val);
1394		}
1395	<	else if (fh != h && f.next == null) // precheck
1396	<	break;                          // rules out possible existence
1395	>	}
1396	>	s.writeObject(null);
1397	>	s.writeObject(null);
1398	>	segments = null; // throw away
1399	>	}
1400	>
1401	>	/**
1402	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1403	>	* @param s the stream
1404	>	*/
1405	>	private void readObject(java.io.ObjectInputStream s)
1406	>	throws java.io.IOException, ClassNotFoundException {
1407	>	/*
1408	>	* To improve performance in typical cases, we create nodes
1409	>	* while reading, then place in table once size is known.
1410	>	* However, we must also validate uniqueness and deal with
1411	>	* overpopulated bins while doing so, which requires
1412	>	* specialized versions of putVal mechanics.
1413	>	*/
1414	>	sizeCtl = -1; // force exclusion for table construction
1415	>	s.defaultReadObject();
1416	>	long size = 0L;
1417	>	Node<K,V> p = null;
1418	>	for (;;) {
1419	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1420	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1421	>	if (k != null && v != null) {
1422	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1423	>	++size;
1424	>	}
1425	>	else
1426	>	break;
1427	>	}
1428	>	if (size == 0L)
1429	>	sizeCtl = 0;
1430	>	else {
1431	>	int n;
1432	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1433	>	n = MAXIMUM_CAPACITY;
1434		else {
1435	<	boolean validated = false;
1436	<	boolean deleted = false;
1437	<	synchronized(f) {
1438	<	if (tabAt(tab, i) == f) {
1439	<	validated = true;
1440	<	for (Node e = f, pred = null;;) {
1441	<	Object ek, ev;
1442	<	if (e.hash == h &&
1443	<	((ev = e.val) != null) &&
1444	<	((ek = e.key) == k || k.equals(ek))) {
1445	<	if (cv == null || cv == ev || cv.equals(ev)) {
1446	<	oldVal = ev;
1447	<	if ((e.val = v) == null) {
1448	<	deleted = true;
1449	<	Node en = e.next;
1450	<	if (pred != null)
1451	<	pred.next = en;
1452	<	else
1453	<	setTabAt(tab, i, en);
1454	<	}
1455	<	}
1435	>	int sz = (int)size;
1436	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1437	>	}
1438	>	@SuppressWarnings({"rawtypes","unchecked"})
1439	>	Node<K,V>[] tab = (Node<K,V>[])new Node[n];
1440	>	int mask = n - 1;
1441	>	long added = 0L;
1442	>	while (p != null) {
1443	>	boolean insertAtFront;
1444	>	Node<K,V> next = p.next, first;
1445	>	int h = p.hash, j = h & mask;
1446	>	if ((first = tabAt(tab, j)) == null)
1447	>	insertAtFront = true;
1448	>	else {
1449	>	K k = p.key;
1450	>	if (first.hash < 0) {
1451	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1452	>	if (t.putTreeVal(h, k, p.val) == null)
1453	>	++added;
1454	>	insertAtFront = false;
1455	>	}
1456	>	else {
1457	>	int binCount = 0;
1458	>	insertAtFront = true;
1459	>	Node<K,V> q; K qk;
1460	>	for (q = first; q != null; q = q.next) {
1461	>	if (q.hash == h &&
1462	>	((qk = q.key) == k ||
1463	>	(qk != null && k.equals(qk)))) {
1464	>	insertAtFront = false;
1465		break;
1466		}
1467	<	pred = e;
1468	<	if ((e = e.next) == null)
1469	<	break;
1467	>	++binCount;
1468	>	}
1469	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1470	>	insertAtFront = false;
1471	>	++added;
1472	>	p.next = first;
1473	>	TreeNode<K,V> hd = null, tl = null;
1474	>	for (q = p; q != null; q = q.next) {
1475	>	TreeNode<K,V> t = new TreeNode<K,V>
1476	>	(q.hash, q.key, q.val, null, null);
1477	>	if ((t.prev = tl) == null)
1478	>	hd = t;
1479	>	else
1480	>	tl.next = t;
1481	>	tl = t;
1482	>	}
1483	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1484		}
1485		}
1486		}
1487	<	if (validated) {
1488	<	if (deleted)
1489	<	addCount(-1L, -1);
1490	<	break;
1487	>	if (insertAtFront) {
1488	>	++added;
1489	>	p.next = first;
1490	>	setTabAt(tab, j, p);
1491		}
1492	+	p = next;
1493		}
1494	+	table = tab;
1495	+	sizeCtl = n - (n >>> 2);
1496	+	baseCount = added;
1497		}
1298	–	return (V)oldVal;
1498		}
1499
1500	<	/*
1501	<	* Internal versions of insertion methods
1502	<	* All have the same basic structure as the first (internalPut):
1503	<	*  1. If table uninitialized, create
1504	<	*  2. If bin empty, try to CAS new node
1505	<	*  3. If bin stale, use new table
1506	<	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1507	<	*  5. Lock and validate; if valid, scan and add or update
1309	<	*
1310	<	* The putAll method differs mainly in attempting to pre-allocate
1311	<	* enough table space, and also more lazily performs count updates
1312	<	* and checks.
1313	<	*
1314	<	* Most of the function-accepting methods can't be factored nicely
1315	<	* because they require different functional forms, so instead
1316	<	* sprawl out similar mechanics.
1500	>	// ConcurrentMap methods
1501	>
1502	>	/**
1503	>	* {@inheritDoc}
1504	>	*
1505	>	* @return the previous value associated with the specified key,
1506	>	*         or {@code null} if there was no mapping for the key
1507	>	* @throws NullPointerException if the specified key or value is null
1508		*/
1509	+	public V putIfAbsent(K key, V value) {
1510	+	return putVal(key, value, true);
1511	+	}
1512
1513	<	/** Implementation for put and putIfAbsent */
1514	<	@SuppressWarnings("unchecked") private final V internalPut
1515	<	(K k, V v, boolean onlyIfAbsent) {
1516	<	if (k == null || v == null) throw new NullPointerException();
1517	<	int h = spread(k.hashCode());
1518	<	int len = 0;
1519	<	for (Node[] tab = table;;) {
1520	<	int i, fh; Node f; Object fk, fv;
1521	<	if (tab == null)
1522	<	tab = initTable();
1523	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1524	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1525	<	break;                   // no lock when adding to empty bin
1513	>	/**
1514	>	* {@inheritDoc}
1515	>	*
1516	>	* @throws NullPointerException if the specified key is null
1517	>	*/
1518	>	public boolean remove(Object key, Object value) {
1519	>	if (key == null)
1520	>	throw new NullPointerException();
1521	>	return value != null && replaceNode(key, null, value) != null;
1522	>	}
1523	>
1524	>	/**
1525	>	* {@inheritDoc}
1526	>	*
1527	>	* @throws NullPointerException if any of the arguments are null
1528	>	*/
1529	>	public boolean replace(K key, V oldValue, V newValue) {
1530	>	if (key == null || oldValue == null || newValue == null)
1531	>	throw new NullPointerException();
1532	>	return replaceNode(key, newValue, oldValue) != null;
1533	>	}
1534	>
1535	>	/**
1536	>	* {@inheritDoc}
1537	>	*
1538	>	* @return the previous value associated with the specified key,
1539	>	*         or {@code null} if there was no mapping for the key
1540	>	* @throws NullPointerException if the specified key or value is null
1541	>	*/
1542	>	public V replace(K key, V value) {
1543	>	if (key == null || value == null)
1544	>	throw new NullPointerException();
1545	>	return replaceNode(key, value, null);
1546	>	}
1547	>
1548	>	// Overrides of JDK8+ Map extension method defaults
1549	>
1550	>	/**
1551	>	* Returns the value to which the specified key is mapped, or the
1552	>	* given default value if this map contains no mapping for the
1553	>	* key.
1554	>	*
1555	>	* @param key the key whose associated value is to be returned
1556	>	* @param defaultValue the value to return if this map contains
1557	>	* no mapping for the given key
1558	>	* @return the mapping for the key, if present; else the default value
1559	>	* @throws NullPointerException if the specified key is null
1560	>	*/
1561	>	public V getOrDefault(Object key, V defaultValue) {
1562	>	V v;
1563	>	return (v = get(key)) == null ? defaultValue : v;
1564	>	}
1565	>
1566	>	public void forEach(BiAction<? super K, ? super V> action) {
1567	>	if (action == null) throw new NullPointerException();
1568	>	Node<K,V>[] t;
1569	>	if ((t = table) != null) {
1570	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1571	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1572	>	action.apply(p.key, p.val);
1573		}
1574	<	else if ((fh = f.hash) < 0) {
1575	<	if ((fk = f.key) instanceof TreeBin) {
1576	<	TreeBin t = (TreeBin)fk;
1577	<	Object oldVal = null;
1578	<	t.acquire(0);
1579	<	try {
1580	<	if (tabAt(tab, i) == f) {
1581	<	len = 2;
1582	<	TreeNode p = t.putTreeNode(h, k, v);
1583	<	if (p != null) {
1584	<	oldVal = p.val;
1585	<	if (!onlyIfAbsent)
1586	<	p.val = v;
1587	<	}
1588	<	}
1589	<	} finally {
1349	<	t.release(0);
1350	<	}
1351	<	if (len != 0) {
1352	<	if (oldVal != null)
1353	<	return (V)oldVal;
1574	>	}
1575	>	}
1576	>
1577	>	public void replaceAll(BiFun<? super K, ? super V, ? extends V> function) {
1578	>	if (function == null) throw new NullPointerException();
1579	>	Node<K,V>[] t;
1580	>	if ((t = table) != null) {
1581	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1582	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1583	>	V oldValue = p.val;
1584	>	for (K key = p.key;;) {
1585	>	V newValue = function.apply(key, oldValue);
1586	>	if (newValue == null)
1587	>	throw new NullPointerException();
1588	>	if (replaceNode(key, newValue, oldValue) != null ||
1589	>	(oldValue = get(key)) == null)
1590		break;
1355	–	}
1356	–	}
1357	–	else
1358	–	tab = (Node[])fk;
1359	–	}
1360	–	else if (onlyIfAbsent && fh == h && (fv = f.val) != null &&
1361	–	((fk = f.key) == k || k.equals(fk))) // peek while nearby
1362	–	return (V)fv;
1363	–	else {
1364	–	Object oldVal = null;
1365	–	synchronized(f) {
1366	–	if (tabAt(tab, i) == f) {
1367	–	len = 1;
1368	–	for (Node e = f;; ++len) {
1369	–	Object ek, ev;
1370	–	if (e.hash == h &&
1371	–	(ev = e.val) != null &&
1372	–	((ek = e.key) == k || k.equals(ek))) {
1373	–	oldVal = ev;
1374	–	if (!onlyIfAbsent)
1375	–	e.val = v;
1376	–	break;
1377	–	}
1378	–	Node last = e;
1379	–	if ((e = e.next) == null) {
1380	–	last.next = new Node(h, k, v, null);
1381	–	if (len >= TREE_THRESHOLD)
1382	–	replaceWithTreeBin(tab, i, k);
1383	–	break;
1384	–	}
1385	–	}
1386	–	}
1387	–	}
1388	–	if (len != 0) {
1389	–	if (oldVal != null)
1390	–	return (V)oldVal;
1391	–	break;
1591		}
1592		}
1593		}
1395	–	addCount(1L, len);
1396	–	return null;
1594		}
1595
1596	<	/** Implementation for computeIfAbsent */
1597	<	@SuppressWarnings("unchecked") private final V internalComputeIfAbsent
1598	<	(K k, Fun<? super K, ?> mf) {
1599	<	if (k == null || mf == null)
1596	>	/**
1597	>	* If the specified key is not already associated with a value,
1598	>	* attempts to compute its value using the given mapping function
1599	>	* and enters it into this map unless {@code null}.  The entire
1600	>	* method invocation is performed atomically, so the function is
1601	>	* applied at most once per key.  Some attempted update operations
1602	>	* on this map by other threads may be blocked while computation
1603	>	* is in progress, so the computation should be short and simple,
1604	>	* and must not attempt to update any other mappings of this map.
1605	>	*
1606	>	* @param key key with which the specified value is to be associated
1607	>	* @param mappingFunction the function to compute a value
1608	>	* @return the current (existing or computed) value associated with
1609	>	*         the specified key, or null if the computed value is null
1610	>	* @throws NullPointerException if the specified key or mappingFunction
1611	>	*         is null
1612	>	* @throws IllegalStateException if the computation detectably
1613	>	*         attempts a recursive update to this map that would
1614	>	*         otherwise never complete
1615	>	* @throws RuntimeException or Error if the mappingFunction does so,
1616	>	*         in which case the mapping is left unestablished
1617	>	*/
1618	>	public V computeIfAbsent(K key, Fun<? super K, ? extends V> mappingFunction) {
1619	>	if (key == null || mappingFunction == null)
1620		throw new NullPointerException();
1621	<	int h = spread(k.hashCode());
1622	<	Object val = null;
1623	<	int len = 0;
1624	<	for (Node[] tab = table;;) {
1625	<	Node f; int i; Object fk;
1626	<	if (tab == null)
1621	>	int h = spread(key.hashCode());
1622	>	V val = null;
1623	>	int binCount = 0;
1624	>	for (Node<K,V>[] tab = table;;) {
1625	>	Node<K,V> f; int n, i, fh;
1626	>	if (tab == null || (n = tab.length) == 0)
1627		tab = initTable();
1628	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1629	<	Node node = new Node(h, k, null, null);
1630	<	synchronized(node) {
1631	<	if (casTabAt(tab, i, null, node)) {
1632	<	len = 1;
1628	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1629	>	Node<K,V> r = new ReservationNode<K,V>();
1630	>	synchronized (r) {
1631	>	if (casTabAt(tab, i, null, r)) {
1632	>	binCount = 1;
1633	>	Node<K,V> node = null;
1634		try {
1635	<	if ((val = mf.apply(k)) != null)
1636	<	node.val = val;
1635	>	if ((val = mappingFunction.apply(key)) != null)
1636	>	node = new Node<K,V>(h, key, val, null);
1637		} finally {
1638	<	if (val == null)
1421	<	setTabAt(tab, i, null);
1638	>	setTabAt(tab, i, node);
1639		}
1640		}
1641		}
1642	<	if (len != 0)
1642	>	if (binCount != 0)
1643		break;
1644		}
1645	<	else if (f.hash < 0) {
1646	<	if ((fk = f.key) instanceof TreeBin) {
1647	<	TreeBin t = (TreeBin)fk;
1648	<	boolean added = false;
1649	<	t.acquire(0);
1650	<	try {
1651	<	if (tabAt(tab, i) == f) {
1652	<	len = 1;
1653	<	TreeNode p = t.getTreeNode(h, k, t.root);
1654	<	if (p != null)
1645	>	else if ((fh = f.hash) == MOVED)
1646	>	tab = helpTransfer(tab, f);
1647	>	else {
1648	>	boolean added = false;
1649	>	synchronized (f) {
1650	>	if (tabAt(tab, i) == f) {
1651	>	if (fh >= 0) {
1652	>	binCount = 1;
1653	>	for (Node<K,V> e = f;; ++binCount) {
1654	>	K ek; V ev;
1655	>	if (e.hash == h &&
1656	>	((ek = e.key) == key ||
1657	>	(ek != null && key.equals(ek)))) {
1658	>	val = e.val;
1659	>	break;
1660	>	}
1661	>	Node<K,V> pred = e;
1662	>	if ((e = e.next) == null) {
1663	>	if ((val = mappingFunction.apply(key)) != null) {
1664	>	added = true;
1665	>	pred.next = new Node<K,V>(h, key, val, null);
1666	>	}
1667	>	break;
1668	>	}
1669	>	}
1670	>	}
1671	>	else if (f instanceof TreeBin) {
1672	>	binCount = 2;
1673	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1674	>	TreeNode<K,V> r, p;
1675	>	if ((r = t.root) != null &&
1676	>	(p = r.findTreeNode(h, key, null)) != null)
1677		val = p.val;
1678	<	else if ((val = mf.apply(k)) != null) {
1678	>	else if ((val = mappingFunction.apply(key)) != null) {
1679		added = true;
1680	<	len = 2;
1442	<	t.putTreeNode(h, k, val);
1680	>	t.putTreeVal(h, key, val);
1681		}
1682		}
1445	–	} finally {
1446	–	t.release(0);
1447	–	}
1448	–	if (len != 0) {
1449	–	if (!added)
1450	–	return (V)val;
1451	–	break;
1683		}
1684		}
1685	<	else
1686	<	tab = (Node[])fk;
1685	>	if (binCount != 0) {
1686	>	if (binCount >= TREEIFY_THRESHOLD)
1687	>	treeifyBin(tab, i);
1688	>	if (!added)
1689	>	return val;
1690	>	break;
1691	>	}
1692		}
1693	+	}
1694	+	if (val != null)
1695	+	addCount(1L, binCount);
1696	+	return val;
1697	+	}
1698	+
1699	+	/**
1700	+	* If the value for the specified key is present, attempts to
1701	+	* compute a new mapping given the key and its current mapped
1702	+	* value.  The entire method invocation is performed atomically.
1703	+	* Some attempted update operations on this map by other threads
1704	+	* may be blocked while computation is in progress, so the
1705	+	* computation should be short and simple, and must not attempt to
1706	+	* update any other mappings of this map.
1707	+	*
1708	+	* @param key key with which a value may be associated
1709	+	* @param remappingFunction the function to compute a value
1710	+	* @return the new value associated with the specified key, or null if none
1711	+	* @throws NullPointerException if the specified key or remappingFunction
1712	+	*         is null
1713	+	* @throws IllegalStateException if the computation detectably
1714	+	*         attempts a recursive update to this map that would
1715	+	*         otherwise never complete
1716	+	* @throws RuntimeException or Error if the remappingFunction does so,
1717	+	*         in which case the mapping is unchanged
1718	+	*/
1719	+	public V computeIfPresent(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1720	+	if (key == null || remappingFunction == null)
1721	+	throw new NullPointerException();
1722	+	int h = spread(key.hashCode());
1723	+	V val = null;
1724	+	int delta = 0;
1725	+	int binCount = 0;
1726	+	for (Node<K,V>[] tab = table;;) {
1727	+	Node<K,V> f; int n, i, fh;
1728	+	if (tab == null || (n = tab.length) == 0)
1729	+	tab = initTable();
1730	+	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1731	+	break;
1732	+	else if ((fh = f.hash) == MOVED)
1733	+	tab = helpTransfer(tab, f);
1734		else {
1735	<	for (Node e = f; e != null; e = e.next) { // prescan
1459	<	Object ek, ev;
1460	<	if (e.hash == h && (ev = e.val) != null &&
1461	<	((ek = e.key) == k || k.equals(ek)))
1462	<	return (V)ev;
1463	<	}
1464	<	boolean added = false;
1465	<	synchronized(f) {
1735	>	synchronized (f) {
1736		if (tabAt(tab, i) == f) {
1737	<	len = 1;
1738	<	for (Node e = f;; ++len) {
1739	<	Object ek, ev;
1740	<	if (e.hash == h &&
1741	<	(ev = e.val) != null &&
1742	<	((ek = e.key) == k || k.equals(ek))) {
1743	<	val = ev;
1744	<	break;
1737	>	if (fh >= 0) {
1738	>	binCount = 1;
1739	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1740	>	K ek;
1741	>	if (e.hash == h &&
1742	>	((ek = e.key) == key ||
1743	>	(ek != null && key.equals(ek)))) {
1744	>	val = remappingFunction.apply(key, e.val);
1745	>	if (val != null)
1746	>	e.val = val;
1747	>	else {
1748	>	delta = -1;
1749	>	Node<K,V> en = e.next;
1750	>	if (pred != null)
1751	>	pred.next = en;
1752	>	else
1753	>	setTabAt(tab, i, en);
1754	>	}
1755	>	break;
1756	>	}
1757	>	pred = e;
1758	>	if ((e = e.next) == null)
1759	>	break;
1760		}
1761	<	Node last = e;
1762	<	if ((e = e.next) == null) {
1763	<	if ((val = mf.apply(k)) != null) {
1764	<	added = true;
1765	<	last.next = new Node(h, k, val, null);
1766	<	if (len >= TREE_THRESHOLD)
1767	<	replaceWithTreeBin(tab, i, k);
1761	>	}
1762	>	else if (f instanceof TreeBin) {
1763	>	binCount = 2;
1764	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1765	>	TreeNode<K,V> r, p;
1766	>	if ((r = t.root) != null &&
1767	>	(p = r.findTreeNode(h, key, null)) != null) {
1768	>	val = remappingFunction.apply(key, p.val);
1769	>	if (val != null)
1770	>	p.val = val;
1771	>	else {
1772	>	delta = -1;
1773	>	if (t.removeTreeNode(p))
1774	>	setTabAt(tab, i, untreeify(t.first));
1775		}
1484	–	break;
1776		}
1777		}
1778		}
1779		}
1780	<	if (len != 0) {
1490	<	if (!added)
1491	<	return (V)val;
1780	>	if (binCount != 0)
1781		break;
1493	–	}
1782		}
1783		}
1784	<	if (val != null)
1785	<	addCount(1L, len);
1786	<	return (V)val;
1784	>	if (delta != 0)
1785	>	addCount((long)delta, binCount);
1786	>	return val;
1787		}
1788
1789	<	/** Implementation for compute */
1790	<	@SuppressWarnings("unchecked") private final V internalCompute
1791	<	(K k, boolean onlyIfPresent,
1792	<	BiFun<? super K, ? super V, ? extends V> mf) {
1793	<	if (k == null || mf == null)
1789	>	/**
1790	>	* Attempts to compute a mapping for the specified key and its
1791	>	* current mapped value (or {@code null} if there is no current
1792	>	* mapping). The entire method invocation is performed atomically.
1793	>	* Some attempted update operations on this map by other threads
1794	>	* may be blocked while computation is in progress, so the
1795	>	* computation should be short and simple, and must not attempt to
1796	>	* update any other mappings of this Map.
1797	>	*
1798	>	* @param key key with which the specified value is to be associated
1799	>	* @param remappingFunction the function to compute a value
1800	>	* @return the new value associated with the specified key, or null if none
1801	>	* @throws NullPointerException if the specified key or remappingFunction
1802	>	*         is null
1803	>	* @throws IllegalStateException if the computation detectably
1804	>	*         attempts a recursive update to this map that would
1805	>	*         otherwise never complete
1806	>	* @throws RuntimeException or Error if the remappingFunction does so,
1807	>	*         in which case the mapping is unchanged
1808	>	*/
1809	>	public V compute(K key,
1810	>	BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1811	>	if (key == null || remappingFunction == null)
1812		throw new NullPointerException();
1813	<	int h = spread(k.hashCode());
1814	<	Object val = null;
1813	>	int h = spread(key.hashCode());
1814	>	V val = null;
1815		int delta = 0;
1816	<	int len = 0;
1817	<	for (Node[] tab = table;;) {
1818	<	Node f; int i, fh; Object fk;
1819	<	if (tab == null)
1816	>	int binCount = 0;
1817	>	for (Node<K,V>[] tab = table;;) {
1818	>	Node<K,V> f; int n, i, fh;
1819	>	if (tab == null || (n = tab.length) == 0)
1820		tab = initTable();
1821	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1822	<	if (onlyIfPresent)
1823	<	break;
1824	<	Node node = new Node(h, k, null, null);
1825	<	synchronized(node) {
1826	<	if (casTabAt(tab, i, null, node)) {
1821	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1822	>	Node<K,V> r = new ReservationNode<K,V>();
1823	>	synchronized (r) {
1824	>	if (casTabAt(tab, i, null, r)) {
1825	>	binCount = 1;
1826	>	Node<K,V> node = null;
1827		try {
1828	<	len = 1;
1523	<	if ((val = mf.apply(k, null)) != null) {
1524	<	node.val = val;
1828	>	if ((val = remappingFunction.apply(key, null)) != null) {
1829		delta = 1;
1830	+	node = new Node<K,V>(h, key, val, null);
1831		}
1832		} finally {
1833	<	if (delta == 0)
1529	<	setTabAt(tab, i, null);
1833	>	setTabAt(tab, i, node);
1834		}
1835		}
1836		}
1837	<	if (len != 0)
1837	>	if (binCount != 0)
1838		break;
1839		}
1840	<	else if ((fh = f.hash) < 0) {
1841	<	if ((fk = f.key) instanceof TreeBin) {
1842	<	TreeBin t = (TreeBin)fk;
1843	<	t.acquire(0);
1844	<	try {
1845	<	if (tabAt(tab, i) == f) {
1846	<	len = 1;
1847	<	TreeNode p = t.getTreeNode(h, k, t.root);
1848	<	if (p == null && onlyIfPresent)
1849	<	break;
1850	<	Object pv = (p == null) ? null : p.val;
1851	<	if ((val = mf.apply(k, (V)pv)) != null) {
1840	>	else if ((fh = f.hash) == MOVED)
1841	>	tab = helpTransfer(tab, f);
1842	>	else {
1843	>	synchronized (f) {
1844	>	if (tabAt(tab, i) == f) {
1845	>	if (fh >= 0) {
1846	>	binCount = 1;
1847	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1848	>	K ek;
1849	>	if (e.hash == h &&
1850	>	((ek = e.key) == key ||
1851	>	(ek != null && key.equals(ek)))) {
1852	>	val = remappingFunction.apply(key, e.val);
1853	>	if (val != null)
1854	>	e.val = val;
1855	>	else {
1856	>	delta = -1;
1857	>	Node<K,V> en = e.next;
1858	>	if (pred != null)
1859	>	pred.next = en;
1860	>	else
1861	>	setTabAt(tab, i, en);
1862	>	}
1863	>	break;
1864	>	}
1865	>	pred = e;
1866	>	if ((e = e.next) == null) {
1867	>	val = remappingFunction.apply(key, null);
1868	>	if (val != null) {
1869	>	delta = 1;
1870	>	pred.next =
1871	>	new Node<K,V>(h, key, val, null);
1872	>	}
1873	>	break;
1874	>	}
1875	>	}
1876	>	}
1877	>	else if (f instanceof TreeBin) {
1878	>	binCount = 1;
1879	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1880	>	TreeNode<K,V> r, p;
1881	>	if ((r = t.root) != null)
1882	>	p = r.findTreeNode(h, key, null);
1883	>	else
1884	>	p = null;
1885	>	V pv = (p == null) ? null : p.val;
1886	>	val = remappingFunction.apply(key, pv);
1887	>	if (val != null) {
1888		if (p != null)
1889		p.val = val;
1890		else {
1551	–	len = 2;
1891		delta = 1;
1892	<	t.putTreeNode(h, k, val);
1892	>	t.putTreeVal(h, key, val);
1893		}
1894		}
1895		else if (p != null) {
1896		delta = -1;
1897	<	t.deleteTreeNode(p);
1897	>	if (t.removeTreeNode(p))
1898	>	setTabAt(tab, i, untreeify(t.first));
1899		}
1900		}
1561	–	} finally {
1562	–	t.release(0);
1901		}
1564	–	if (len != 0)
1565	–	break;
1902		}
1903	<	else
1904	<	tab = (Node[])fk;
1905	<	}
1570	<	else {
1571	<	synchronized(f) {
1572	<	if (tabAt(tab, i) == f) {
1573	<	len = 1;
1574	<	for (Node e = f, pred = null;; ++len) {
1575	<	Object ek, ev;
1576	<	if (e.hash == h &&
1577	<	(ev = e.val) != null &&
1578	<	((ek = e.key) == k || k.equals(ek))) {
1579	<	val = mf.apply(k, (V)ev);
1580	<	if (val != null)
1581	<	e.val = val;
1582	<	else {
1583	<	delta = -1;
1584	<	Node en = e.next;
1585	<	if (pred != null)
1586	<	pred.next = en;
1587	<	else
1588	<	setTabAt(tab, i, en);
1589	<	}
1590	<	break;
1591	<	}
1592	<	pred = e;
1593	<	if ((e = e.next) == null) {
1594	<	if (!onlyIfPresent &&
1595	<	(val = mf.apply(k, null)) != null) {
1596	<	pred.next = new Node(h, k, val, null);
1597	<	delta = 1;
1598	<	if (len >= TREE_THRESHOLD)
1599	<	replaceWithTreeBin(tab, i, k);
1600	<	}
1601	<	break;
1602	<	}
1603	<	}
1604	<	}
1605	<	}
1606	<	if (len != 0)
1903	>	if (binCount != 0) {
1904	>	if (binCount >= TREEIFY_THRESHOLD)
1905	>	treeifyBin(tab, i);
1906		break;
1907	+	}
1908		}
1909		}
1910		if (delta != 0)
1911	<	addCount((long)delta, len);
1912	<	return (V)val;
1911	>	addCount((long)delta, binCount);
1912	>	return val;
1913		}
1914
1915	<	/** Implementation for merge */
1916	<	@SuppressWarnings("unchecked") private final V internalMerge
1917	<	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
1918	<	if (k == null || v == null || mf == null)
1915	>	/**
1916	>	* If the specified key is not already associated with a
1917	>	* (non-null) value, associates it with the given value.
1918	>	* Otherwise, replaces the value with the results of the given
1919	>	* remapping function, or removes if {@code null}. The entire
1920	>	* method invocation is performed atomically.  Some attempted
1921	>	* update operations on this map by other threads may be blocked
1922	>	* while computation is in progress, so the computation should be
1923	>	* short and simple, and must not attempt to update any other
1924	>	* mappings of this Map.
1925	>	*
1926	>	* @param key key with which the specified value is to be associated
1927	>	* @param value the value to use if absent
1928	>	* @param remappingFunction the function to recompute a value if present
1929	>	* @return the new value associated with the specified key, or null if none
1930	>	* @throws NullPointerException if the specified key or the
1931	>	*         remappingFunction is null
1932	>	* @throws RuntimeException or Error if the remappingFunction does so,
1933	>	*         in which case the mapping is unchanged
1934	>	*/
1935	>	public V merge(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1936	>	if (key == null || value == null || remappingFunction == null)
1937		throw new NullPointerException();
1938	<	int h = spread(k.hashCode());
1939	<	Object val = null;
1938	>	int h = spread(key.hashCode());
1939	>	V val = null;
1940		int delta = 0;
1941	<	int len = 0;
1942	<	for (Node[] tab = table;;) {
1943	<	int i; Node f; Object fk, fv;
1944	<	if (tab == null)
1941	>	int binCount = 0;
1942	>	for (Node<K,V>[] tab = table;;) {
1943	>	Node<K,V> f; int n, i, fh;
1944	>	if (tab == null || (n = tab.length) == 0)
1945		tab = initTable();
1946	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1947	<	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1946	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1947	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1948		delta = 1;
1949	<	val = v;
1949	>	val = value;
1950		break;
1951		}
1952		}
1953	<	else if (f.hash < 0) {
1954	<	if ((fk = f.key) instanceof TreeBin) {
1955	<	TreeBin t = (TreeBin)fk;
1956	<	t.acquire(0);
1957	<	try {
1958	<	if (tabAt(tab, i) == f) {
1959	<	len = 1;
1960	<	TreeNode p = t.getTreeNode(h, k, t.root);
1961	<	val = (p == null) ? v : mf.apply((V)p.val, v);
1953	>	else if ((fh = f.hash) == MOVED)
1954	>	tab = helpTransfer(tab, f);
1955	>	else {
1956	>	synchronized (f) {
1957	>	if (tabAt(tab, i) == f) {
1958	>	if (fh >= 0) {
1959	>	binCount = 1;
1960	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1961	>	K ek;
1962	>	if (e.hash == h &&
1963	>	((ek = e.key) == key ||
1964	>	(ek != null && key.equals(ek)))) {
1965	>	val = remappingFunction.apply(e.val, value);
1966	>	if (val != null)
1967	>	e.val = val;
1968	>	else {
1969	>	delta = -1;
1970	>	Node<K,V> en = e.next;
1971	>	if (pred != null)
1972	>	pred.next = en;
1973	>	else
1974	>	setTabAt(tab, i, en);
1975	>	}
1976	>	break;
1977	>	}
1978	>	pred = e;
1979	>	if ((e = e.next) == null) {
1980	>	delta = 1;
1981	>	val = value;
1982	>	pred.next =
1983	>	new Node<K,V>(h, key, val, null);
1984	>	break;
1985	>	}
1986	>	}
1987	>	}
1988	>	else if (f instanceof TreeBin) {
1989	>	binCount = 2;
1990	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1991	>	TreeNode<K,V> r = t.root;
1992	>	TreeNode<K,V> p = (r == null) ? null :
1993	>	r.findTreeNode(h, key, null);
1994	>	val = (p == null) ? value :
1995	>	remappingFunction.apply(p.val, value);
1996		if (val != null) {
1997		if (p != null)
1998		p.val = val;
1999		else {
1648	–	len = 2;
2000		delta = 1;
2001	<	t.putTreeNode(h, k, val);
2001	>	t.putTreeVal(h, key, val);
2002		}
2003		}
2004		else if (p != null) {
2005		delta = -1;
2006	<	t.deleteTreeNode(p);
2006	>	if (t.removeTreeNode(p))
2007	>	setTabAt(tab, i, untreeify(t.first));
2008		}
2009		}
1658	–	} finally {
1659	–	t.release(0);
2010		}
1661	–	if (len != 0)
1662	–	break;
2011		}
2012	<	else
2013	<	tab = (Node[])fk;
2014	<	}
1667	<	else {
1668	<	synchronized(f) {
1669	<	if (tabAt(tab, i) == f) {
1670	<	len = 1;
1671	<	for (Node e = f, pred = null;; ++len) {
1672	<	Object ek, ev;
1673	<	if (e.hash == h &&
1674	<	(ev = e.val) != null &&
1675	<	((ek = e.key) == k || k.equals(ek))) {
1676	<	val = mf.apply((V)ev, v);
1677	<	if (val != null)
1678	<	e.val = val;
1679	<	else {
1680	<	delta = -1;
1681	<	Node en = e.next;
1682	<	if (pred != null)
1683	<	pred.next = en;
1684	<	else
1685	<	setTabAt(tab, i, en);
1686	<	}
1687	<	break;
1688	<	}
1689	<	pred = e;
1690	<	if ((e = e.next) == null) {
1691	<	val = v;
1692	<	pred.next = new Node(h, k, val, null);
1693	<	delta = 1;
1694	<	if (len >= TREE_THRESHOLD)
1695	<	replaceWithTreeBin(tab, i, k);
1696	<	break;
1697	<	}
1698	<	}
1699	<	}
1700	<	}
1701	<	if (len != 0)
2012	>	if (binCount != 0) {
2013	>	if (binCount >= TREEIFY_THRESHOLD)
2014	>	treeifyBin(tab, i);
2015		break;
2016	+	}
2017		}
2018		}
2019		if (delta != 0)
2020	<	addCount((long)delta, len);
2021	<	return (V)val;
2020	>	addCount((long)delta, binCount);
2021	>	return val;
2022		}
2023
2024	<	/** Implementation for putAll */
2025	<	private final void internalPutAll(Map<?, ?> m) {
2026	<	tryPresize(m.size());
2027	<	long delta = 0L;     // number of uncommitted additions
2028	<	boolean npe = false; // to throw exception on exit for nulls
2029	<	try {                // to clean up counts on other exceptions
2030	<	for (Map.Entry<?, ?> entry : m.entrySet()) {
2031	<	Object k, v;
2032	<	if (entry == null || (k = entry.getKey()) == null ||
2033	<	(v = entry.getValue()) == null) {
2034	<	npe = true;
2035	<	break;
2036	<	}
2037	<	int h = spread(k.hashCode());
2038	<	for (Node[] tab = table;;) {
2039	<	int i; Node f; int fh; Object fk;
2040	<	if (tab == null)
2041	<	tab = initTable();
2042	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
2043	<	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
2044	<	++delta;
2045	<	break;
2046	<	}
2047	<	}
2048	<	else if ((fh = f.hash) < 0) {
2049	<	if ((fk = f.key) instanceof TreeBin) {
2050	<	TreeBin t = (TreeBin)fk;
2051	<	boolean validated = false;
2052	<	t.acquire(0);
2053	<	try {
2054	<	if (tabAt(tab, i) == f) {
2055	<	validated = true;
2056	<	TreeNode p = t.getTreeNode(h, k, t.root);
2057	<	if (p != null)
2058	<	p.val = v;
2059	<	else {
2060	<	t.putTreeNode(h, k, v);
2061	<	++delta;
2062	<	}
2063	<	}
2064	<	} finally {
2065	<	t.release(0);
2066	<	}
2067	<	if (validated)
2068	<	break;
2069	<	}
2070	<	else
2071	<	tab = (Node[])fk;
2072	<	}
2073	<	else {
2074	<	int len = 0;
2075	<	synchronized(f) {
2076	<	if (tabAt(tab, i) == f) {
2077	<	len = 1;
2078	<	for (Node e = f;; ++len) {
2079	<	Object ek, ev;
2080	<	if (e.hash == h &&
2081	<	(ev = e.val) != null &&
2082	<	((ek = e.key) == k || k.equals(ek))) {
2083	<	e.val = v;
2084	<	break;
2085	<	}
2086	<	Node last = e;
2087	<	if ((e = e.next) == null) {
2088	<	++delta;
2089	<	last.next = new Node(h, k, v, null);
2090	<	if (len >= TREE_THRESHOLD)
2091	<	replaceWithTreeBin(tab, i, k);
2092	<	break;
2093	<	}
2094	<	}
2095	<	}
2096	<	}
2097	<	if (len != 0) {
2098	<	if (len > 1)
2099	<	addCount(delta, len);
2100	<	break;
2101	<	}
2102	<	}
2103	<	}
2104	<	}
2105	<	} finally {
2106	<	if (delta != 0L)
2107	<	addCount(delta, 2);
2108	<	}
2109	<	if (npe)
2024	>	// Hashtable legacy methods
2025	>
2026	>	/**
2027	>	* Legacy method testing if some key maps into the specified value
2028	>	* in this table.  This method is identical in functionality to
2029	>	* {@link #containsValue(Object)}, and exists solely to ensure
2030	>	* full compatibility with class {@link java.util.Hashtable},
2031	>	* which supported this method prior to introduction of the
2032	>	* Java Collections framework.
2033	>	*
2034	>	* @param  value a value to search for
2035	>	* @return {@code true} if and only if some key maps to the
2036	>	*         {@code value} argument in this table as
2037	>	*         determined by the {@code equals} method;
2038	>	*         {@code false} otherwise
2039	>	* @throws NullPointerException if the specified value is null
2040	>	*/
2041	>	@Deprecated public boolean contains(Object value) {
2042	>	return containsValue(value);
2043	>	}
2044	>
2045	>	/**
2046	>	* Returns an enumeration of the keys in this table.
2047	>	*
2048	>	* @return an enumeration of the keys in this table
2049	>	* @see #keySet()
2050	>	*/
2051	>	public Enumeration<K> keys() {
2052	>	Node<K,V>[] t;
2053	>	int f = (t = table) == null ? 0 : t.length;
2054	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2055	>	}
2056	>
2057	>	/**
2058	>	* Returns an enumeration of the values in this table.
2059	>	*
2060	>	* @return an enumeration of the values in this table
2061	>	* @see #values()
2062	>	*/
2063	>	public Enumeration<V> elements() {
2064	>	Node<K,V>[] t;
2065	>	int f = (t = table) == null ? 0 : t.length;
2066	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2067	>	}
2068	>
2069	>	// ConcurrentHashMapV8-only methods
2070	>
2071	>	/**
2072	>	* Returns the number of mappings. This method should be used
2073	>	* instead of {@link #size} because a ConcurrentHashMapV8 may
2074	>	* contain more mappings than can be represented as an int. The
2075	>	* value returned is an estimate; the actual count may differ if
2076	>	* there are concurrent insertions or removals.
2077	>	*
2078	>	* @return the number of mappings
2079	>	* @since 1.8
2080	>	*/
2081	>	public long mappingCount() {
2082	>	long n = sumCount();
2083	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2084	>	}
2085	>
2086	>	/**
2087	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2088	>	* from the given type to {@code Boolean.TRUE}.
2089	>	*
2090	>	* @return the new set
2091	>	* @since 1.8
2092	>	*/
2093	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2094	>	return new KeySetView<K,Boolean>
2095	>	(new ConcurrentHashMapV8<K,Boolean>(), Boolean.TRUE);
2096	>	}
2097	>
2098	>	/**
2099	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2100	>	* from the given type to {@code Boolean.TRUE}.
2101	>	*
2102	>	* @param initialCapacity The implementation performs internal
2103	>	* sizing to accommodate this many elements.
2104	>	* @throws IllegalArgumentException if the initial capacity of
2105	>	* elements is negative
2106	>	* @return the new set
2107	>	* @since 1.8
2108	>	*/
2109	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2110	>	return new KeySetView<K,Boolean>
2111	>	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2112	>	}
2113	>
2114	>	/**
2115	>	* Returns a {@link Set} view of the keys in this map, using the
2116	>	* given common mapped value for any additions (i.e., {@link
2117	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2118	>	* This is of course only appropriate if it is acceptable to use
2119	>	* the same value for all additions from this view.
2120	>	*
2121	>	* @param mappedValue the mapped value to use for any additions
2122	>	* @return the set view
2123	>	* @throws NullPointerException if the mappedValue is null
2124	>	*/
2125	>	public KeySetView<K,V> keySet(V mappedValue) {
2126	>	if (mappedValue == null)
2127		throw new NullPointerException();
2128	+	return new KeySetView<K,V>(this, mappedValue);
2129		}
2130
2131	+	/* ---------------- Special Nodes -------------- */
2132	+
2133		/**
2134	<	* Implementation for clear. Steps through each bin, removing all
1801	<	* nodes.
2134	>	* A node inserted at head of bins during transfer operations.
2135		*/
2136	<	private final void internalClear() {
2137	<	long delta = 0L; // negative number of deletions
2138	<	int i = 0;
2139	<	Node[] tab = table;
2140	<	while (tab != null && i < tab.length) {
2141	<	Node f = tabAt(tab, i);
2142	<	if (f == null)
2143	<	++i;
2144	<	else if (f.hash < 0) {
2145	<	Object fk;
2146	<	if ((fk = f.key) instanceof TreeBin) {
2147	<	TreeBin t = (TreeBin)fk;
2148	<	t.acquire(0);
2149	<	try {
2150	<	if (tabAt(tab, i) == f) {
2151	<	for (Node p = t.first; p != null; p = p.next) {
2152	<	if (p.val != null) { // (currently always true)
2153	<	p.val = null;
2154	<	--delta;
2155	<	}
2156	<	}
2157	<	t.first = null;
2158	<	t.root = null;
1826	<	++i;
1827	<	}
1828	<	} finally {
1829	<	t.release(0);
1830	<	}
1831	<	}
1832	<	else
1833	<	tab = (Node[])fk;
1834	<	}
1835	<	else {
1836	<	synchronized(f) {
1837	<	if (tabAt(tab, i) == f) {
1838	<	for (Node e = f; e != null; e = e.next) {
1839	<	if (e.val != null) {  // (currently always true)
1840	<	e.val = null;
1841	<	--delta;
1842	<	}
2136	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2137	>	final Node<K,V>[] nextTable;
2138	>	ForwardingNode(Node<K,V>[] tab) {
2139	>	super(MOVED, null, null, null);
2140	>	this.nextTable = tab;
2141	>	}
2142	>
2143	>	Node<K,V> find(int h, Object k) {
2144	>	// loop to avoid arbitrarily deep recursion on forwarding nodes
2145	>	outer: for (Node<K,V>[] tab = nextTable;;) {
2146	>	Node<K,V> e; int n;
2147	>	if (k == null || tab == null || (n = tab.length) == 0 ||
2148	>	(e = tabAt(tab, (n - 1) & h)) == null)
2149	>	return null;
2150	>	for (;;) {
2151	>	int eh; K ek;
2152	>	if ((eh = e.hash) == h &&
2153	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2154	>	return e;
2155	>	if (eh < 0) {
2156	>	if (e instanceof ForwardingNode) {
2157	>	tab = ((ForwardingNode<K,V>)e).nextTable;
2158	>	continue outer;
2159		}
2160	<	setTabAt(tab, i, null);
2161	<	++i;
2160	>	else
2161	>	return e.find(h, k);
2162		}
2163	+	if ((e = e.next) == null)
2164	+	return null;
2165		}
2166		}
2167		}
1850	–	if (delta != 0L)
1851	–	addCount(delta, -1);
2168		}
2169
1854	–	/* ---------------- Table Initialization and Resizing -------------- */
1855	–
2170		/**
2171	<	* Returns a power of two table size for the given desired capacity.
1858	<	* See Hackers Delight, sec 3.2
2171	>	* A place-holder node used in computeIfAbsent and compute
2172		*/
2173	<	private static final int tableSizeFor(int c) {
2174	<	int n = c - 1;
2175	<	n |= n >>> 1;
2176	<	n |= n >>> 2;
2177	<	n |= n >>> 4;
2178	<	n |= n >>> 8;
2179	<	n |= n >>> 16;
2180	<	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
2173	>	static final class ReservationNode<K,V> extends Node<K,V> {
2174	>	ReservationNode() {
2175	>	super(RESERVED, null, null, null);
2176	>	}
2177	>
2178	>	Node<K,V> find(int h, Object k) {
2179	>	return null;
2180	>	}
2181		}
2182
2183	+	/* ---------------- Table Initialization and Resizing -------------- */
2184	+
2185		/**
2186		* Initializes table, using the size recorded in sizeCtl.
2187		*/
2188	<	private final Node[] initTable() {
2189	<	Node[] tab; int sc;
2190	<	while ((tab = table) == null) {
2188	>	private final Node<K,V>[] initTable() {
2189	>	Node<K,V>[] tab; int sc;
2190	>	while ((tab = table) == null || tab.length == 0) {
2191		if ((sc = sizeCtl) < 0)
2192		Thread.yield(); // lost initialization race; just spin
2193		else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2194		try {
2195	<	if ((tab = table) == null) {
2195	>	if ((tab = table) == null || tab.length == 0) {
2196		int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2197	<	tab = table = new Node[n];
2197	>	@SuppressWarnings({"rawtypes","unchecked"})
2198	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n];
2199	>	table = tab = nt;
2200		sc = n - (n >>> 2);
2201		}
2202		} finally {
#	Line 1920 | Line 2237 | public class ConcurrentHashMapV8<K, V>
2237		s = sumCount();
2238		}
2239		if (check >= 0) {
2240	<	Node[] tab, nt; int sc;
2240	>	Node<K,V>[] tab, nt; int sc;
2241		while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2242		tab.length < MAXIMUM_CAPACITY) {
2243		if (sc < 0) {
#	Line 1938 | Line 2255 | public class ConcurrentHashMapV8<K, V>
2255		}
2256
2257		/**
2258	+	* Helps transfer if a resize is in progress.
2259	+	*/
2260	+	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2261	+	Node<K,V>[] nextTab; int sc;
2262	+	if ((f instanceof ForwardingNode) &&
2263	+	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2264	+	if (nextTab == nextTable && tab == table &&
2265	+	transferIndex > transferOrigin && (sc = sizeCtl) < -1 &&
2266	+	U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2267	+	transfer(tab, nextTab);
2268	+	return nextTab;
2269	+	}
2270	+	return table;
2271	+	}
2272	+
2273	+	/**
2274		* Tries to presize table to accommodate the given number of elements.
2275		*
2276		* @param size number of elements (doesn't need to be perfectly accurate)
#	Line 1947 | Line 2280 | public class ConcurrentHashMapV8<K, V>
2280		tableSizeFor(size + (size >>> 1) + 1);
2281		int sc;
2282		while ((sc = sizeCtl) >= 0) {
2283	<	Node[] tab = table; int n;
2283	>	Node<K,V>[] tab = table; int n;
2284		if (tab == null || (n = tab.length) == 0) {
2285		n = (sc > c) ? sc : c;
2286		if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2287		try {
2288		if (table == tab) {
2289	<	table = new Node[n];
2289	>	@SuppressWarnings({"rawtypes","unchecked"})
2290	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n];
2291	>	table = nt;
2292		sc = n - (n >>> 2);
2293		}
2294		} finally {
#	Line 1969 | Line 2304 | public class ConcurrentHashMapV8<K, V>
2304		}
2305		}
2306
2307	<	/*
2307	>	/**
2308		* Moves and/or copies the nodes in each bin to new table. See
2309		* above for explanation.
2310		*/
2311	<	private final void transfer(Node[] tab, Node[] nextTab) {
2311	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2312		int n = tab.length, stride;
2313		if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2314		stride = MIN_TRANSFER_STRIDE; // subdivide range
2315		if (nextTab == null) {            // initiating
2316		try {
2317	<	nextTab = new Node[n << 1];
2318	<	} catch(Throwable ex) {       // try to cope with OOME
2317	>	@SuppressWarnings({"rawtypes","unchecked"})
2318	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n << 1];
2319	>	nextTab = nt;
2320	>	} catch (Throwable ex) {      // try to cope with OOME
2321		sizeCtl = Integer.MAX_VALUE;
2322		return;
2323		}
2324		nextTable = nextTab;
2325		transferOrigin = n;
2326		transferIndex = n;
2327	<	Node rev = new Node(MOVED, tab, null, null);
2327	>	ForwardingNode<K,V> rev = new ForwardingNode<K,V>(tab);
2328		for (int k = n; k > 0;) {    // progressively reveal ready slots
2329	<	int nextk = k > stride? k - stride : 0;
2329	>	int nextk = (k > stride) ? k - stride : 0;
2330		for (int m = nextk; m < k; ++m)
2331		nextTab[m] = rev;
2332		for (int m = n + nextk; m < n + k; ++m)
#	Line 1998 | Line 2335 | public class ConcurrentHashMapV8<K, V>
2335		}
2336		}
2337		int nextn = nextTab.length;
2338	<	Node fwd = new Node(MOVED, nextTab, null, null);
2338	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2339		boolean advance = true;
2340	+	boolean finishing = false; // to ensure sweep before committing nextTab
2341		for (int i = 0, bound = 0;;) {
2342	<	int nextIndex, nextBound; Node f; Object fk;
2342	>	int nextIndex, nextBound, fh; Node<K,V> f;
2343		while (advance) {
2344	<	if (--i >= bound)
2344	>	if (--i >= bound || finishing)
2345		advance = false;
2346		else if ((nextIndex = transferIndex) <= transferOrigin) {
2347		i = -1;
#	Line 2011 | Line 2349 | public class ConcurrentHashMapV8<K, V>
2349		}
2350		else if (U.compareAndSwapInt
2351		(this, TRANSFERINDEX, nextIndex,
2352	<	nextBound = (nextIndex > stride?
2352	>	nextBound = (nextIndex > stride ?
2353		nextIndex - stride : 0))) {
2354		bound = nextBound;
2355		i = nextIndex - 1;
#	Line 2019 | Line 2357 | public class ConcurrentHashMapV8<K, V>
2357		}
2358		}
2359		if (i < 0 || i >= n || i + n >= nextn) {
2360	+	if (finishing) {
2361	+	nextTable = null;
2362	+	table = nextTab;
2363	+	sizeCtl = (n << 1) - (n >>> 1);
2364	+	return;
2365	+	}
2366		for (int sc;;) {
2367		if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, ++sc)) {
2368	<	if (sc == -1) {
2369	<	nextTable = null;
2370	<	table = nextTab;
2371	<	sizeCtl = (n << 1) - (n >>> 1);
2372	<	}
2029	<	return;
2368	>	if (sc != -1)
2369	>	return;
2370	>	finishing = advance = true;
2371	>	i = n; // recheck before commit
2372	>	break;
2373		}
2374		}
2375		}
#	Line 2037 | Line 2380 | public class ConcurrentHashMapV8<K, V>
2380		advance = true;
2381		}
2382		}
2383	<	else if (f.hash >= 0) {
2384	<	synchronized(f) {
2383	>	else if ((fh = f.hash) == MOVED)
2384	>	advance = true; // already processed
2385	>	else {
2386	>	synchronized (f) {
2387		if (tabAt(tab, i) == f) {
2388	<	int runBit = f.hash & n;
2389	<	Node lastRun = f, lo = null, hi = null;
2390	<	for (Node p = f.next; p != null; p = p.next) {
2391	<	int b = p.hash & n;
2392	<	if (b != runBit) {
2393	<	runBit = b;
2394	<	lastRun = p;
2388	>	Node<K,V> ln, hn;
2389	>	if (fh >= 0) {
2390	>	int runBit = fh & n;
2391	>	Node<K,V> lastRun = f;
2392	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2393	>	int b = p.hash & n;
2394	>	if (b != runBit) {
2395	>	runBit = b;
2396	>	lastRun = p;
2397	>	}
2398		}
2399	<	}
2400	<	if (runBit == 0)
2401	<	lo = lastRun;
2054	<	else
2055	<	hi = lastRun;
2056	<	for (Node p = f; p != lastRun; p = p.next) {
2057	<	int ph = p.hash;
2058	<	Object pk = p.key, pv = p.val;
2059	<	if ((ph & n) == 0)
2060	<	lo = new Node(ph, pk, pv, lo);
2061	<	else
2062	<	hi = new Node(ph, pk, pv, hi);
2063	<	}
2064	<	setTabAt(nextTab, i, lo);
2065	<	setTabAt(nextTab, i + n, hi);
2066	<	setTabAt(tab, i, fwd);
2067	<	advance = true;
2068	<	}
2069	<	}
2070	<	}
2071	<	else if ((fk = f.key) instanceof TreeBin) {
2072	<	TreeBin t = (TreeBin)fk;
2073	<	t.acquire(0);
2074	<	try {
2075	<	if (tabAt(tab, i) == f) {
2076	<	TreeBin lt = new TreeBin();
2077	<	TreeBin ht = new TreeBin();
2078	<	int lc = 0, hc = 0;
2079	<	for (Node e = t.first; e != null; e = e.next) {
2080	<	int h = e.hash;
2081	<	Object k = e.key, v = e.val;
2082	<	if ((h & n) == 0) {
2083	<	++lc;
2084	<	lt.putTreeNode(h, k, v);
2399	>	if (runBit == 0) {
2400	>	ln = lastRun;
2401	>	hn = null;
2402		}
2403		else {
2404	<	++hc;
2405	<	ht.putTreeNode(h, k, v);
2404	>	hn = lastRun;
2405	>	ln = null;
2406		}
2407	+	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2408	+	int ph = p.hash; K pk = p.key; V pv = p.val;
2409	+	if ((ph & n) == 0)
2410	+	ln = new Node<K,V>(ph, pk, pv, ln);
2411	+	else
2412	+	hn = new Node<K,V>(ph, pk, pv, hn);
2413	+	}
2414	+	setTabAt(nextTab, i, ln);
2415	+	setTabAt(nextTab, i + n, hn);
2416	+	setTabAt(tab, i, fwd);
2417	+	advance = true;
2418		}
2419	<	Node ln, hn; // throw away trees if too small
2420	<	if (lc < TREE_THRESHOLD) {
2421	<	ln = null;
2422	<	for (Node p = lt.first; p != null; p = p.next)
2423	<	ln = new Node(p.hash, p.key, p.val, ln);
2424	<	}
2425	<	else
2426	<	ln = new Node(MOVED, lt, null, null);
2427	<	setTabAt(nextTab, i, ln);
2428	<	if (hc < TREE_THRESHOLD) {
2429	<	hn = null;
2430	<	for (Node p = ht.first; p != null; p = p.next)
2431	<	hn = new Node(p.hash, p.key, p.val, hn);
2419	>	else if (f instanceof TreeBin) {
2420	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2421	>	TreeNode<K,V> lo = null, loTail = null;
2422	>	TreeNode<K,V> hi = null, hiTail = null;
2423	>	int lc = 0, hc = 0;
2424	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2425	>	int h = e.hash;
2426	>	TreeNode<K,V> p = new TreeNode<K,V>
2427	>	(h, e.key, e.val, null, null);
2428	>	if ((h & n) == 0) {
2429	>	if ((p.prev = loTail) == null)
2430	>	lo = p;
2431	>	else
2432	>	loTail.next = p;
2433	>	loTail = p;
2434	>	++lc;
2435	>	}
2436	>	else {
2437	>	if ((p.prev = hiTail) == null)
2438	>	hi = p;
2439	>	else
2440	>	hiTail.next = p;
2441	>	hiTail = p;
2442	>	++hc;
2443	>	}
2444	>	}
2445	>	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2446	>	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2447	>	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2448	>	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2449	>	setTabAt(nextTab, i, ln);
2450	>	setTabAt(nextTab, i + n, hn);
2451	>	setTabAt(tab, i, fwd);
2452	>	advance = true;
2453		}
2105	–	else
2106	–	hn = new Node(MOVED, ht, null, null);
2107	–	setTabAt(nextTab, i + n, hn);
2108	–	setTabAt(tab, i, fwd);
2109	–	advance = true;
2454		}
2111	–	} finally {
2112	–	t.release(0);
2455		}
2456		}
2115	–	else
2116	–	advance = true; // already processed
2457		}
2458		}
2459
2460	<	/* ---------------- Counter support -------------- */
2460	>	/* ---------------- Conversion from/to TreeBins -------------- */
2461
2462	<	final long sumCount() {
2463	<	CounterCell[] as = counterCells; CounterCell a;
2464	<	long sum = baseCount;
2465	<	if (as != null) {
2466	<	for (int i = 0; i < as.length; ++i) {
2467	<	if ((a = as[i]) != null)
2468	<	sum += a.value;
2462	>	/**
2463	>	* Replaces all linked nodes in bin at given index unless table is
2464	>	* too small, in which case resizes instead.
2465	>	*/
2466	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2467	>	Node<K,V> b; int n, sc;
2468	>	if (tab != null) {
2469	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY) {
2470	>	if (tab == table && (sc = sizeCtl) >= 0 &&
2471	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2472	>	transfer(tab, null);
2473		}
2474	<	}
2475	<	return sum;
2476	<	}
2477	<
2478	<	// See LongAdder version for explanation
2479	<	private final void fullAddCount(long x, CounterHashCode hc,
2480	<	boolean wasUncontended) {
2481	<	int h;
2482	<	if (hc == null) {
2483	<	hc = new CounterHashCode();
2484	<	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
2485	<	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
2486	<	threadCounterHashCode.set(hc);
2143	<	}
2144	<	else
2145	<	h = hc.code;
2146	<	boolean collide = false;                // True if last slot nonempty
2147	<	for (;;) {
2148	<	CounterCell[] as; CounterCell a; int n; long v;
2149	<	if ((as = counterCells) != null && (n = as.length) > 0) {
2150	<	if ((a = as[(n - 1) & h]) == null) {
2151	<	if (counterBusy == 0) {            // Try to attach new Cell
2152	<	CounterCell r = new CounterCell(x); // Optimistic create
2153	<	if (counterBusy == 0 &&
2154	<	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2155	<	boolean created = false;
2156	<	try {               // Recheck under lock
2157	<	CounterCell[] rs; int m, j;
2158	<	if ((rs = counterCells) != null &&
2159	<	(m = rs.length) > 0 &&
2160	<	rs[j = (m - 1) & h] == null) {
2161	<	rs[j] = r;
2162	<	created = true;
2163	<	}
2164	<	} finally {
2165	<	counterBusy = 0;
2166	<	}
2167	<	if (created)
2168	<	break;
2169	<	continue;           // Slot is now non-empty
2170	<	}
2171	<	}
2172	<	collide = false;
2173	<	}
2174	<	else if (!wasUncontended)       // CAS already known to fail
2175	<	wasUncontended = true;      // Continue after rehash
2176	<	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
2177	<	break;
2178	<	else if (counterCells != as || n >= NCPU)
2179	<	collide = false;            // At max size or stale
2180	<	else if (!collide)
2181	<	collide = true;
2182	<	else if (counterBusy == 0 &&
2183	<	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2184	<	try {
2185	<	if (counterCells == as) {// Expand table unless stale
2186	<	CounterCell[] rs = new CounterCell[n << 1];
2187	<	for (int i = 0; i < n; ++i)
2188	<	rs[i] = as[i];
2189	<	counterCells = rs;
2474	>	else if ((b = tabAt(tab, index)) != null && b.hash >= 0) {
2475	>	synchronized (b) {
2476	>	if (tabAt(tab, index) == b) {
2477	>	TreeNode<K,V> hd = null, tl = null;
2478	>	for (Node<K,V> e = b; e != null; e = e.next) {
2479	>	TreeNode<K,V> p =
2480	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2481	>	null, null);
2482	>	if ((p.prev = tl) == null)
2483	>	hd = p;
2484	>	else
2485	>	tl.next = p;
2486	>	tl = p;
2487		}
2488	<	} finally {
2192	<	counterBusy = 0;
2488	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2489		}
2194	–	collide = false;
2195	–	continue;                   // Retry with expanded table
2490		}
2197	–	h ^= h << 13;                   // Rehash
2198	–	h ^= h >>> 17;
2199	–	h ^= h << 5;
2491		}
2201	–	else if (counterBusy == 0 && counterCells == as &&
2202	–	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2203	–	boolean init = false;
2204	–	try {                           // Initialize table
2205	–	if (counterCells == as) {
2206	–	CounterCell[] rs = new CounterCell[2];
2207	–	rs[h & 1] = new CounterCell(x);
2208	–	counterCells = rs;
2209	–	init = true;
2210	–	}
2211	–	} finally {
2212	–	counterBusy = 0;
2213	–	}
2214	–	if (init)
2215	–	break;
2216	–	}
2217	–	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
2218	–	break;                          // Fall back on using base
2492		}
2220	–	hc.code = h;                            // Record index for next time
2493		}
2494
2495	<	/* ----------------Table Traversal -------------- */
2495	>	/**
2496	>	* Returns a list on non-TreeNodes replacing those in given list.
2497	>	*/
2498	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2499	>	Node<K,V> hd = null, tl = null;
2500	>	for (Node<K,V> q = b; q != null; q = q.next) {
2501	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2502	>	if (tl == null)
2503	>	hd = p;
2504	>	else
2505	>	tl.next = p;
2506	>	tl = p;
2507	>	}
2508	>	return hd;
2509	>	}
2510	>
2511	>	/* ---------------- TreeNodes -------------- */
2512
2513		/**
2514	<	* Encapsulates traversal for methods such as containsValue; also
2515	<	* serves as a base class for other iterators and bulk tasks.
2516	<	*
2517	<	* At each step, the iterator snapshots the key ("nextKey") and
2518	<	* value ("nextVal") of a valid node (i.e., one that, at point of
2519	<	* snapshot, has a non-null user value). Because val fields can
2520	<	* change (including to null, indicating deletion), field nextVal
2521	<	* might not be accurate at point of use, but still maintains the
2234	<	* weak consistency property of holding a value that was once
2235	<	* valid. To support iterator.remove, the nextKey field is not
2236	<	* updated (nulled out) when the iterator cannot advance.
2237	<	*
2238	<	* Internal traversals directly access these fields, as in:
2239	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2240	<	*
2241	<	* Exported iterators must track whether the iterator has advanced
2242	<	* (in hasNext vs next) (by setting/checking/nulling field
2243	<	* nextVal), and then extract key, value, or key-value pairs as
2244	<	* return values of next().
2245	<	*
2246	<	* The iterator visits once each still-valid node that was
2247	<	* reachable upon iterator construction. It might miss some that
2248	<	* were added to a bin after the bin was visited, which is OK wrt
2249	<	* consistency guarantees. Maintaining this property in the face
2250	<	* of possible ongoing resizes requires a fair amount of
2251	<	* bookkeeping state that is difficult to optimize away amidst
2252	<	* volatile accesses.  Even so, traversal maintains reasonable
2253	<	* throughput.
2254	<	*
2255	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2256	<	* However, if the table has been resized, then all future steps
2257	<	* must traverse both the bin at the current index as well as at
2258	<	* (index + baseSize); and so on for further resizings. To
2259	<	* paranoically cope with potential sharing by users of iterators
2260	<	* across threads, iteration terminates if a bounds checks fails
2261	<	* for a table read.
2262	<	*
2263	<	* This class extends CountedCompleter to streamline parallel
2264	<	* iteration in bulk operations. This adds only a few fields of
2265	<	* space overhead, which is small enough in cases where it is not
2266	<	* needed to not worry about it.  Because CountedCompleter is
2267	<	* Serializable, but iterators need not be, we need to add warning
2268	<	* suppressions.
2269	<	*/
2270	<	@SuppressWarnings("serial") static class Traverser<K,V,R>
2271	<	extends CountedCompleter<R> {
2272	<	final ConcurrentHashMapV8<K, V> map;
2273	<	Node next;           // the next entry to use
2274	<	Object nextKey;      // cached key field of next
2275	<	Object nextVal;      // cached val field of next
2276	<	Node[] tab;          // current table; updated if resized
2277	<	int index;           // index of bin to use next
2278	<	int baseIndex;       // current index of initial table
2279	<	int baseLimit;       // index bound for initial table
2280	<	int baseSize;        // initial table size
2281	<	int batch;           // split control
2514	>	* Nodes for use in TreeBins
2515	>	*/
2516	>	static final class TreeNode<K,V> extends Node<K,V> {
2517	>	TreeNode<K,V> parent;  // red-black tree links
2518	>	TreeNode<K,V> left;
2519	>	TreeNode<K,V> right;
2520	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2521	>	boolean red;
2522
2523	<	/** Creates iterator for all entries in the table. */
2524	<	Traverser(ConcurrentHashMapV8<K, V> map) {
2525	<	this.map = map;
2523	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2524	>	TreeNode<K,V> parent) {
2525	>	super(hash, key, val, next);
2526	>	this.parent = parent;
2527		}
2528
2529	<	/** Creates iterator for split() methods and task constructors */
2530	<	Traverser(ConcurrentHashMapV8<K,V> map, Traverser<K,V,?> it, int batch) {
2290	<	super(it);
2291	<	this.batch = batch;
2292	<	if ((this.map = map) != null && it != null) { // split parent
2293	<	Node[] t;
2294	<	if ((t = it.tab) == null &&
2295	<	(t = it.tab = map.table) != null)
2296	<	it.baseLimit = it.baseSize = t.length;
2297	<	this.tab = t;
2298	<	this.baseSize = it.baseSize;
2299	<	int hi = this.baseLimit = it.baseLimit;
2300	<	it.baseLimit = this.index = this.baseIndex =
2301	<	(hi + it.baseIndex + 1) >>> 1;
2302	<	}
2529	>	Node<K,V> find(int h, Object k) {
2530	>	return findTreeNode(h, k, null);
2531		}
2532
2533		/**
2534	<	* Advances next; returns nextVal or null if terminated.
2535	<	* See above for explanation.
2534	>	* Returns the TreeNode (or null if not found) for the given key
2535	>	* starting at given root.
2536		*/
2537	<	final Object advance() {
2538	<	Node e = next;
2539	<	Object ev = null;
2540	<	outer: do {
2541	<	if (e != null)                  // advance past used/skipped node
2542	<	e = e.next;
2543	<	while (e == null) {             // get to next non-null bin
2544	<	ConcurrentHashMapV8<K, V> m;
2545	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2546	<	if ((t = tab) != null)
2547	<	n = t.length;
2548	<	else if ((m = map) != null && (t = tab = m.table) != null)
2549	<	n = baseLimit = baseSize = t.length;
2537	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2538	>	if (k != null) {
2539	>	TreeNode<K,V> p = this;
2540	>	do  {
2541	>	int ph, dir; K pk; TreeNode<K,V> q;
2542	>	TreeNode<K,V> pl = p.left, pr = p.right;
2543	>	if ((ph = p.hash) > h)
2544	>	p = pl;
2545	>	else if (ph < h)
2546	>	p = pr;
2547	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2548	>	return p;
2549	>	else if (pl == null && pr == null)
2550	>	break;
2551	>	else if ((kc != null ||
2552	>	(kc = comparableClassFor(k)) != null) &&
2553	>	(dir = compareComparables(kc, k, pk)) != 0)
2554	>	p = (dir < 0) ? pl : pr;
2555	>	else if (pl == null)
2556	>	p = pr;
2557	>	else if (pr == null ||
2558	>	(q = pr.findTreeNode(h, k, kc)) == null)
2559	>	p = pl;
2560		else
2561	<	break outer;
2562	<	if ((b = baseIndex) >= baseLimit ||
2563	<	(i = index) < 0 || i >= n)
2564	<	break outer;
2565	<	if ((e = tabAt(t, i)) != null && e.hash < 0) {
2566	<	if ((ek = e.key) instanceof TreeBin)
2567	<	e = ((TreeBin)ek).first;
2568	<	else {
2569	<	tab = (Node[])ek;
2570	<	continue;           // restarts due to null val
2561	>	return q;
2562	>	} while (p != null);
2563	>	}
2564	>	return null;
2565	>	}
2566	>	}
2567	>
2568	>	/* ---------------- TreeBins -------------- */
2569	>
2570	>	/**
2571	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2572	>	* keys or values, but instead point to list of TreeNodes and
2573	>	* their root. They also maintain a parasitic read-write lock
2574	>	* forcing writers (who hold bin lock) to wait for readers (who do
2575	>	* not) to complete before tree restructuring operations.
2576	>	*/
2577	>	static final class TreeBin<K,V> extends Node<K,V> {
2578	>	TreeNode<K,V> root;
2579	>	volatile TreeNode<K,V> first;
2580	>	volatile Thread waiter;
2581	>	volatile int lockState;
2582	>	// values for lockState
2583	>	static final int WRITER = 1; // set while holding write lock
2584	>	static final int WAITER = 2; // set when waiting for write lock
2585	>	static final int READER = 4; // increment value for setting read lock
2586	>
2587	>	/**
2588	>	* Creates bin with initial set of nodes headed by b.
2589	>	*/
2590	>	TreeBin(TreeNode<K,V> b) {
2591	>	super(TREEBIN, null, null, null);
2592	>	this.first = b;
2593	>	TreeNode<K,V> r = null;
2594	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2595	>	next = (TreeNode<K,V>)x.next;
2596	>	x.left = x.right = null;
2597	>	if (r == null) {
2598	>	x.parent = null;
2599	>	x.red = false;
2600	>	r = x;
2601	>	}
2602	>	else {
2603	>	Object key = x.key;
2604	>	int hash = x.hash;
2605	>	Class<?> kc = null;
2606	>	for (TreeNode<K,V> p = r;;) {
2607	>	int dir, ph;
2608	>	if ((ph = p.hash) > hash)
2609	>	dir = -1;
2610	>	else if (ph < hash)
2611	>	dir = 1;
2612	>	else if ((kc != null ||
2613	>	(kc = comparableClassFor(key)) != null))
2614	>	dir = compareComparables(kc, key, p.key);
2615	>	else
2616	>	dir = 0;
2617	>	TreeNode<K,V> xp = p;
2618	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2619	>	x.parent = xp;
2620	>	if (dir <= 0)
2621	>	xp.left = x;
2622	>	else
2623	>	xp.right = x;
2624	>	r = balanceInsertion(r, x);
2625	>	break;
2626		}
2627	<	}                           // visit upper slots if present
2335	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2627	>	}
2628		}
2629	<	nextKey = e.key;
2630	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2339	<	next = e;
2340	<	return nextVal = ev;
2629	>	}
2630	>	this.root = r;
2631		}
2632
2633	<	public final void remove() {
2634	<	Object k = nextKey;
2635	<	if (k == null && (advance() == null || (k = nextKey) == null))
2636	<	throw new IllegalStateException();
2637	<	map.internalReplace(k, null, null);
2633	>	/**
2634	>	* Acquires write lock for tree restructuring.
2635	>	*/
2636	>	private final void lockRoot() {
2637	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2638	>	contendedLock(); // offload to separate method
2639		}
2640
2641	<	public final boolean hasNext() {
2642	<	return nextVal != null || advance() != null;
2641	>	/**
2642	>	* Releases write lock for tree restructuring.
2643	>	*/
2644	>	private final void unlockRoot() {
2645	>	lockState = 0;
2646		}
2647
2354	–	public final boolean hasMoreElements() { return hasNext(); }
2355	–
2356	–	public void compute() { } // default no-op CountedCompleter body
2357	–
2648		/**
2649	<	* Returns a batch value > 0 if this task should (and must) be
2360	<	* split, if so, adding to pending count, and in any case
2361	<	* updating batch value. The initial batch value is approx
2362	<	* exp2 of the number of times (minus one) to split task by
2363	<	* two before executing leaf action. This value is faster to
2364	<	* compute and more convenient to use as a guide to splitting
2365	<	* than is the depth, since it is used while dividing by two
2366	<	* anyway.
2649	>	* Possibly blocks awaiting root lock.
2650		*/
2651	<	final int preSplit() {
2652	<	ConcurrentHashMapV8<K, V> m; int b; Node[] t;  ForkJoinPool pool;
2653	<	if ((b = batch) < 0 && (m = map) != null) { // force initialization
2654	<	if ((t = tab) == null && (t = tab = m.table) != null)
2655	<	baseLimit = baseSize = t.length;
2656	<	if (t != null) {
2657	<	long n = m.sumCount();
2658	<	int par = ((pool = getPool()) == null) ?
2659	<	ForkJoinPool.getCommonPoolParallelism() :
2660	<	pool.getParallelism();
2661	<	int sp = par << 3; // slack of 8
2662	<	b = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
2663	<	}
2664	<	}
2665	<	b = (b <= 1 || baseIndex == baseLimit) ? 0 : (b >>> 1);
2666	<	if ((batch = b) > 0)
2667	<	addToPendingCount(1);
2668	<	return b;
2651	>	private final void contendedLock() {
2652	>	boolean waiting = false;
2653	>	for (int s;;) {
2654	>	if (((s = lockState) & WRITER) == 0) {
2655	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2656	>	if (waiting)
2657	>	waiter = null;
2658	>	return;
2659	>	}
2660	>	}
2661	>	else if ((s | WAITER) == 0) {
2662	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2663	>	waiting = true;
2664	>	waiter = Thread.currentThread();
2665	>	}
2666	>	}
2667	>	else if (waiting)
2668	>	LockSupport.park(this);
2669	>	}
2670		}
2671
2672	<	}
2673	<
2674	<	/* ---------------- Public operations -------------- */
2675	<
2676	<	/**
2677	<	* Creates a new, empty map with the default initial table size (16).
2678	<	*/
2679	<	public ConcurrentHashMapV8() {
2680	<	}
2681	<
2682	<	/**
2683	<	* Creates a new, empty map with an initial table size
2684	<	* accommodating the specified number of elements without the need
2685	<	* to dynamically resize.
2686	<	*
2687	<	* @param initialCapacity The implementation performs internal
2688	<	* sizing to accommodate this many elements.
2689	<	* @throws IllegalArgumentException if the initial capacity of
2690	<	* elements is negative
2691	<	*/
2692	<	public ConcurrentHashMapV8(int initialCapacity) {
2693	<	if (initialCapacity < 0)
2694	<	throw new IllegalArgumentException();
2695	<	int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
2696	<	MAXIMUM_CAPACITY :
2697	<	tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2698	<	this.sizeCtl = cap;
2699	<	}
2700	<
2701	<	/**
2702	<	* Creates a new map with the same mappings as the given map.
2703	<	*
2704	<	* @param m the map
2705	<	*/
2422	<	public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2423	<	this.sizeCtl = DEFAULT_CAPACITY;
2424	<	internalPutAll(m);
2425	<	}
2426	<
2427	<	/**
2428	<	* Creates a new, empty map with an initial table size based on
2429	<	* the given number of elements ({@code initialCapacity}) and
2430	<	* initial table density ({@code loadFactor}).
2431	<	*
2432	<	* @param initialCapacity the initial capacity. The implementation
2433	<	* performs internal sizing to accommodate this many elements,
2434	<	* given the specified load factor.
2435	<	* @param loadFactor the load factor (table density) for
2436	<	* establishing the initial table size
2437	<	* @throws IllegalArgumentException if the initial capacity of
2438	<	* elements is negative or the load factor is nonpositive
2439	<	*
2440	<	* @since 1.6
2441	<	*/
2442	<	public ConcurrentHashMapV8(int initialCapacity, float loadFactor) {
2443	<	this(initialCapacity, loadFactor, 1);
2444	<	}
2445	<
2446	<	/**
2447	<	* Creates a new, empty map with an initial table size based on
2448	<	* the given number of elements ({@code initialCapacity}), table
2449	<	* density ({@code loadFactor}), and number of concurrently
2450	<	* updating threads ({@code concurrencyLevel}).
2451	<	*
2452	<	* @param initialCapacity the initial capacity. The implementation
2453	<	* performs internal sizing to accommodate this many elements,
2454	<	* given the specified load factor.
2455	<	* @param loadFactor the load factor (table density) for
2456	<	* establishing the initial table size
2457	<	* @param concurrencyLevel the estimated number of concurrently
2458	<	* updating threads. The implementation may use this value as
2459	<	* a sizing hint.
2460	<	* @throws IllegalArgumentException if the initial capacity is
2461	<	* negative or the load factor or concurrencyLevel are
2462	<	* nonpositive
2463	<	*/
2464	<	public ConcurrentHashMapV8(int initialCapacity,
2465	<	float loadFactor, int concurrencyLevel) {
2466	<	if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
2467	<	throw new IllegalArgumentException();
2468	<	if (initialCapacity < concurrencyLevel)   // Use at least as many bins
2469	<	initialCapacity = concurrencyLevel;   // as estimated threads
2470	<	long size = (long)(1.0 + (long)initialCapacity / loadFactor);
2471	<	int cap = (size >= (long)MAXIMUM_CAPACITY) ?
2472	<	MAXIMUM_CAPACITY : tableSizeFor((int)size);
2473	<	this.sizeCtl = cap;
2474	<	}
2475	<
2476	<	/**
2477	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2478	<	* from the given type to {@code Boolean.TRUE}.
2479	<	*
2480	<	* @return the new set
2481	<	*/
2482	<	public static <K> KeySetView<K,Boolean> newKeySet() {
2483	<	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(),
2484	<	Boolean.TRUE);
2485	<	}
2486	<
2487	<	/**
2488	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2489	<	* from the given type to {@code Boolean.TRUE}.
2490	<	*
2491	<	* @param initialCapacity The implementation performs internal
2492	<	* sizing to accommodate this many elements.
2493	<	* @throws IllegalArgumentException if the initial capacity of
2494	<	* elements is negative
2495	<	* @return the new set
2496	<	*/
2497	<	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2498	<	return new KeySetView<K,Boolean>
2499	<	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2500	<	}
2501	<
2502	<	/**
2503	<	* {@inheritDoc}
2504	<	*/
2505	<	public boolean isEmpty() {
2506	<	return sumCount() <= 0L; // ignore transient negative values
2507	<	}
2508	<
2509	<	/**
2510	<	* {@inheritDoc}
2511	<	*/
2512	<	public int size() {
2513	<	long n = sumCount();
2514	<	return ((n < 0L) ? 0 :
2515	<	(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
2516	<	(int)n);
2517	<	}
2518	<
2519	<	/**
2520	<	* Returns the number of mappings. This method should be used
2521	<	* instead of {@link #size} because a ConcurrentHashMapV8 may
2522	<	* contain more mappings than can be represented as an int. The
2523	<	* value returned is an estimate; the actual count may differ if
2524	<	* there are concurrent insertions or removals.
2525	<	*
2526	<	* @return the number of mappings
2527	<	*/
2528	<	public long mappingCount() {
2529	<	long n = sumCount();
2530	<	return (n < 0L) ? 0L : n; // ignore transient negative values
2531	<	}
2532	<
2533	<	/**
2534	<	* Returns the value to which the specified key is mapped,
2535	<	* or {@code null} if this map contains no mapping for the key.
2536	<	*
2537	<	* <p>More formally, if this map contains a mapping from a key
2538	<	* {@code k} to a value {@code v} such that {@code key.equals(k)},
2539	<	* then this method returns {@code v}; otherwise it returns
2540	<	* {@code null}.  (There can be at most one such mapping.)
2541	<	*
2542	<	* @throws NullPointerException if the specified key is null
2543	<	*/
2544	<	public V get(Object key) {
2545	<	return internalGet(key);
2546	<	}
2547	<
2548	<	/**
2549	<	* Returns the value to which the specified key is mapped,
2550	<	* or the given defaultValue if this map contains no mapping for the key.
2551	<	*
2552	<	* @param key the key
2553	<	* @param defaultValue the value to return if this map contains
2554	<	* no mapping for the given key
2555	<	* @return the mapping for the key, if present; else the defaultValue
2556	<	* @throws NullPointerException if the specified key is null
2557	<	*/
2558	<	public V getValueOrDefault(Object key, V defaultValue) {
2559	<	V v;
2560	<	return (v = internalGet(key)) == null ? defaultValue : v;
2561	<	}
2562	<
2563	<	/**
2564	<	* Tests if the specified object is a key in this table.
2565	<	*
2566	<	* @param  key   possible key
2567	<	* @return {@code true} if and only if the specified object
2568	<	*         is a key in this table, as determined by the
2569	<	*         {@code equals} method; {@code false} otherwise
2570	<	* @throws NullPointerException if the specified key is null
2571	<	*/
2572	<	public boolean containsKey(Object key) {
2573	<	return internalGet(key) != null;
2574	<	}
2575	<
2576	<	/**
2577	<	* Returns {@code true} if this map maps one or more keys to the
2578	<	* specified value. Note: This method may require a full traversal
2579	<	* of the map, and is much slower than method {@code containsKey}.
2580	<	*
2581	<	* @param value value whose presence in this map is to be tested
2582	<	* @return {@code true} if this map maps one or more keys to the
2583	<	*         specified value
2584	<	* @throws NullPointerException if the specified value is null
2585	<	*/
2586	<	public boolean containsValue(Object value) {
2587	<	if (value == null)
2588	<	throw new NullPointerException();
2589	<	Object v;
2590	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2591	<	while ((v = it.advance()) != null) {
2592	<	if (v == value || value.equals(v))
2593	<	return true;
2672	>	/**
2673	>	* Returns matching node or null if none. Tries to search
2674	>	* using tree comparisons from root, but continues linear
2675	>	* search when lock not available.
2676	>	*/
2677	>	final Node<K,V> find(int h, Object k) {
2678	>	if (k != null) {
2679	>	for (Node<K,V> e = first; e != null; e = e.next) {
2680	>	int s; K ek;
2681	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2682	>	if (e.hash == h &&
2683	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2684	>	return e;
2685	>	}
2686	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2687	>	s + READER)) {
2688	>	TreeNode<K,V> r, p;
2689	>	try {
2690	>	p = ((r = root) == null ? null :
2691	>	r.findTreeNode(h, k, null));
2692	>	} finally {
2693	>	Thread w;
2694	>	int ls;
2695	>	do {} while (!U.compareAndSwapInt
2696	>	(this, LOCKSTATE,
2697	>	ls = lockState, ls - READER));
2698	>	if (ls == (READER|WAITER) && (w = waiter) != null)
2699	>	LockSupport.unpark(w);
2700	>	}
2701	>	return p;
2702	>	}
2703	>	}
2704	>	}
2705	>	return null;
2706		}
2595	–	return false;
2596	–	}
2597	–
2598	–	/**
2599	–	* Legacy method testing if some key maps into the specified value
2600	–	* in this table.  This method is identical in functionality to
2601	–	* {@link #containsValue}, and exists solely to ensure
2602	–	* full compatibility with class {@link java.util.Hashtable},
2603	–	* which supported this method prior to introduction of the
2604	–	* Java Collections framework.
2605	–	*
2606	–	* @param  value a value to search for
2607	–	* @return {@code true} if and only if some key maps to the
2608	–	*         {@code value} argument in this table as
2609	–	*         determined by the {@code equals} method;
2610	–	*         {@code false} otherwise
2611	–	* @throws NullPointerException if the specified value is null
2612	–	*/
2613	–	public boolean contains(Object value) {
2614	–	return containsValue(value);
2615	–	}
2616	–
2617	–	/**
2618	–	* Maps the specified key to the specified value in this table.
2619	–	* Neither the key nor the value can be null.
2620	–	*
2621	–	* <p>The value can be retrieved by calling the {@code get} method
2622	–	* with a key that is equal to the original key.
2623	–	*
2624	–	* @param key key with which the specified value is to be associated
2625	–	* @param value value to be associated with the specified key
2626	–	* @return the previous value associated with {@code key}, or
2627	–	*         {@code null} if there was no mapping for {@code key}
2628	–	* @throws NullPointerException if the specified key or value is null
2629	–	*/
2630	–	public V put(K key, V value) {
2631	–	return internalPut(key, value, false);
2632	–	}
2633	–
2634	–	/**
2635	–	* {@inheritDoc}
2636	–	*
2637	–	* @return the previous value associated with the specified key,
2638	–	*         or {@code null} if there was no mapping for the key
2639	–	* @throws NullPointerException if the specified key or value is null
2640	–	*/
2641	–	public V putIfAbsent(K key, V value) {
2642	–	return internalPut(key, value, true);
2643	–	}
2707
2708	<	/**
2709	<	* Copies all of the mappings from the specified map to this one.
2710	<	* These mappings replace any mappings that this map had for any of the
2711	<	* keys currently in the specified map.
2712	<	*
2713	<	* @param m mappings to be stored in this map
2714	<	*/
2715	<	public void putAll(Map<? extends K, ? extends V> m) {
2716	<	internalPutAll(m);
2717	<	}
2718	<
2719	<	/**
2720	<	* If the specified key is not already associated with a value,
2721	<	* computes its value using the given mappingFunction and enters
2722	<	* it into the map unless null.  This is equivalent to
2723	<	* <pre> {@code
2724	<	* if (map.containsKey(key))
2725	<	*   return map.get(key);
2726	<	* value = mappingFunction.apply(key);
2727	<	* if (value != null)
2728	<	*   map.put(key, value);
2729	<	* return value;}</pre>
2730	<	*
2731	<	* except that the action is performed atomically.  If the
2732	<	* function returns {@code null} no mapping is recorded. If the
2733	<	* function itself throws an (unchecked) exception, the exception
2734	<	* is rethrown to its caller, and no mapping is recorded.  Some
2735	<	* attempted update operations on this map by other threads may be
2736	<	* blocked while computation is in progress, so the computation
2737	<	* should be short and simple, and must not attempt to update any
2738	<	* other mappings of this Map. The most appropriate usage is to
2739	<	* construct a new object serving as an initial mapped value, or
2740	<	* memoized result, as in:
2741	<	*
2742	<	*  <pre> {@code
2743	<	* map.computeIfAbsent(key, new Fun<K, V>() {
2744	<	*   public V map(K k) { return new Value(f(k)); }});}</pre>
2745	<	*
2746	<	* @param key key with which the specified value is to be associated
2747	<	* @param mappingFunction the function to compute a value
2748	<	* @return the current (existing or computed) value associated with
2749	<	*         the specified key, or null if the computed value is null
2750	<	* @throws NullPointerException if the specified key or mappingFunction
2751	<	*         is null
2752	<	* @throws IllegalStateException if the computation detectably
2753	<	*         attempts a recursive update to this map that would
2754	<	*         otherwise never complete
2755	<	* @throws RuntimeException or Error if the mappingFunction does so,
2756	<	*         in which case the mapping is left unestablished
2757	<	*/
2758	<	public V computeIfAbsent
2759	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
2760	<	return internalComputeIfAbsent(key, mappingFunction);
2761	<	}
2762	<
2700	<	/**
2701	<	* If the given key is present, computes a new mapping value given a key and
2702	<	* its current mapped value. This is equivalent to
2703	<	*  <pre> {@code
2704	<	*   if (map.containsKey(key)) {
2705	<	*     value = remappingFunction.apply(key, map.get(key));
2706	<	*     if (value != null)
2707	<	*       map.put(key, value);
2708	<	*     else
2709	<	*       map.remove(key);
2710	<	*   }
2711	<	* }</pre>
2712	<	*
2713	<	* except that the action is performed atomically.  If the
2714	<	* function returns {@code null}, the mapping is removed.  If the
2715	<	* function itself throws an (unchecked) exception, the exception
2716	<	* is rethrown to its caller, and the current mapping is left
2717	<	* unchanged.  Some attempted update operations on this map by
2718	<	* other threads may be blocked while computation is in progress,
2719	<	* so the computation should be short and simple, and must not
2720	<	* attempt to update any other mappings of this Map. For example,
2721	<	* to either create or append new messages to a value mapping:
2722	<	*
2723	<	* @param key key with which the specified value is to be associated
2724	<	* @param remappingFunction the function to compute a value
2725	<	* @return the new value associated with the specified key, or null if none
2726	<	* @throws NullPointerException if the specified key or remappingFunction
2727	<	*         is null
2728	<	* @throws IllegalStateException if the computation detectably
2729	<	*         attempts a recursive update to this map that would
2730	<	*         otherwise never complete
2731	<	* @throws RuntimeException or Error if the remappingFunction does so,
2732	<	*         in which case the mapping is unchanged
2733	<	*/
2734	<	public V computeIfPresent
2735	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2736	<	return internalCompute(key, true, remappingFunction);
2737	<	}
2738	<
2739	<	/**
2740	<	* Computes a new mapping value given a key and
2741	<	* its current mapped value (or {@code null} if there is no current
2742	<	* mapping). This is equivalent to
2743	<	*  <pre> {@code
2744	<	*   value = remappingFunction.apply(key, map.get(key));
2745	<	*   if (value != null)
2746	<	*     map.put(key, value);
2747	<	*   else
2748	<	*     map.remove(key);
2749	<	* }</pre>
2750	<	*
2751	<	* except that the action is performed atomically.  If the
2752	<	* function returns {@code null}, the mapping is removed.  If the
2753	<	* function itself throws an (unchecked) exception, the exception
2754	<	* is rethrown to its caller, and the current mapping is left
2755	<	* unchanged.  Some attempted update operations on this map by
2756	<	* other threads may be blocked while computation is in progress,
2757	<	* so the computation should be short and simple, and must not
2758	<	* attempt to update any other mappings of this Map. For example,
2759	<	* to either create or append new messages to a value mapping:
2760	<	*
2761	<	* <pre> {@code
2762	<	* Map<Key, String> map = ...;
2763	<	* final String msg = ...;
2764	<	* map.compute(key, new BiFun<Key, String, String>() {
2765	<	*   public String apply(Key k, String v) {
2766	<	*    return (v == null) ? msg : v + msg;});}}</pre>
2767	<	*
2768	<	* @param key key with which the specified value is to be associated
2769	<	* @param remappingFunction the function to compute a value
2770	<	* @return the new value associated with the specified key, or null if none
2771	<	* @throws NullPointerException if the specified key or remappingFunction
2772	<	*         is null
2773	<	* @throws IllegalStateException if the computation detectably
2774	<	*         attempts a recursive update to this map that would
2775	<	*         otherwise never complete
2776	<	* @throws RuntimeException or Error if the remappingFunction does so,
2777	<	*         in which case the mapping is unchanged
2778	<	*/
2779	<	public V compute
2780	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2781	<	return internalCompute(key, false, remappingFunction);
2782	<	}
2783	<
2784	<	/**
2785	<	* If the specified key is not already associated
2786	<	* with a value, associate it with the given value.
2787	<	* Otherwise, replace the value with the results of
2788	<	* the given remapping function. This is equivalent to:
2789	<	*  <pre> {@code
2790	<	*   if (!map.containsKey(key))
2791	<	*     map.put(value);
2792	<	*   else {
2793	<	*     newValue = remappingFunction.apply(map.get(key), value);
2794	<	*     if (value != null)
2795	<	*       map.put(key, value);
2796	<	*     else
2797	<	*       map.remove(key);
2798	<	*   }
2799	<	* }</pre>
2800	<	* except that the action is performed atomically.  If the
2801	<	* function returns {@code null}, the mapping is removed.  If the
2802	<	* function itself throws an (unchecked) exception, the exception
2803	<	* is rethrown to its caller, and the current mapping is left
2804	<	* unchanged.  Some attempted update operations on this map by
2805	<	* other threads may be blocked while computation is in progress,
2806	<	* so the computation should be short and simple, and must not
2807	<	* attempt to update any other mappings of this Map.
2808	<	*/
2809	<	public V merge
2810	<	(K key, V value,
2811	<	BiFun<? super V, ? super V, ? extends V> remappingFunction) {
2812	<	return internalMerge(key, value, remappingFunction);
2813	<	}
2814	<
2815	<	/**
2816	<	* Removes the key (and its corresponding value) from this map.
2817	<	* This method does nothing if the key is not in the map.
2818	<	*
2819	<	* @param  key the key that needs to be removed
2820	<	* @return the previous value associated with {@code key}, or
2821	<	*         {@code null} if there was no mapping for {@code key}
2822	<	* @throws NullPointerException if the specified key is null
2823	<	*/
2824	<	public V remove(Object key) {
2825	<	return internalReplace(key, null, null);
2826	<	}
2827	<
2828	<	/**
2829	<	* {@inheritDoc}
2830	<	*
2831	<	* @throws NullPointerException if the specified key is null
2832	<	*/
2833	<	public boolean remove(Object key, Object value) {
2834	<	return value != null && internalReplace(key, null, value) != null;
2835	<	}
2708	>	/**
2709	>	* Finds or adds a node.
2710	>	* @return null if added
2711	>	*/
2712	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2713	>	Class<?> kc = null;
2714	>	for (TreeNode<K,V> p = root;;) {
2715	>	int dir, ph; K pk; TreeNode<K,V> q, pr;
2716	>	if (p == null) {
2717	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2718	>	break;
2719	>	}
2720	>	else if ((ph = p.hash) > h)
2721	>	dir = -1;
2722	>	else if (ph < h)
2723	>	dir = 1;
2724	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2725	>	return p;
2726	>	else if ((kc == null &&
2727	>	(kc = comparableClassFor(k)) == null) ||
2728	>	(dir = compareComparables(kc, k, pk)) == 0) {
2729	>	if (p.left == null)
2730	>	dir = 1;
2731	>	else if ((pr = p.right) == null ||
2732	>	(q = pr.findTreeNode(h, k, kc)) == null)
2733	>	dir = -1;
2734	>	else
2735	>	return q;
2736	>	}
2737	>	TreeNode<K,V> xp = p;
2738	>	if ((p = (dir < 0) ? p.left : p.right) == null) {
2739	>	TreeNode<K,V> x, f = first;
2740	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2741	>	if (f != null)
2742	>	f.prev = x;
2743	>	if (dir < 0)
2744	>	xp.left = x;
2745	>	else
2746	>	xp.right = x;
2747	>	if (!xp.red)
2748	>	x.red = true;
2749	>	else {
2750	>	lockRoot();
2751	>	try {
2752	>	root = balanceInsertion(root, x);
2753	>	} finally {
2754	>	unlockRoot();
2755	>	}
2756	>	}
2757	>	break;
2758	>	}
2759	>	}
2760	>	assert checkInvariants(root);
2761	>	return null;
2762	>	}
2763
2764	<	/**
2765	<	* {@inheritDoc}
2766	<	*
2767	<	* @throws NullPointerException if any of the arguments are null
2768	<	*/
2769	<	public boolean replace(K key, V oldValue, V newValue) {
2770	<	if (key == null || oldValue == null || newValue == null)
2771	<	throw new NullPointerException();
2772	<	return internalReplace(key, newValue, oldValue) != null;
2773	<	}
2764	>	/**
2765	>	* Removes the given node, that must be present before this
2766	>	* call.  This is messier than typical red-black deletion code
2767	>	* because we cannot swap the contents of an interior node
2768	>	* with a leaf successor that is pinned by "next" pointers
2769	>	* that are accessible independently of lock. So instead we
2770	>	* swap the tree linkages.
2771	>	*
2772	>	* @return true if now too small, so should be untreeified
2773	>	*/
2774	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2775	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2776	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2777	>	TreeNode<K,V> r, rl;
2778	>	if (pred == null)
2779	>	first = next;
2780	>	else
2781	>	pred.next = next;
2782	>	if (next != null)
2783	>	next.prev = pred;
2784	>	if (first == null) {
2785	>	root = null;
2786	>	return true;
2787	>	}
2788	>	if ((r = root) == null || r.right == null || // too small
2789	>	(rl = r.left) == null || rl.left == null)
2790	>	return true;
2791	>	lockRoot();
2792	>	try {
2793	>	TreeNode<K,V> replacement;
2794	>	TreeNode<K,V> pl = p.left;
2795	>	TreeNode<K,V> pr = p.right;
2796	>	if (pl != null && pr != null) {
2797	>	TreeNode<K,V> s = pr, sl;
2798	>	while ((sl = s.left) != null) // find successor
2799	>	s = sl;
2800	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2801	>	TreeNode<K,V> sr = s.right;
2802	>	TreeNode<K,V> pp = p.parent;
2803	>	if (s == pr) { // p was s's direct parent
2804	>	p.parent = s;
2805	>	s.right = p;
2806	>	}
2807	>	else {
2808	>	TreeNode<K,V> sp = s.parent;
2809	>	if ((p.parent = sp) != null) {
2810	>	if (s == sp.left)
2811	>	sp.left = p;
2812	>	else
2813	>	sp.right = p;
2814	>	}
2815	>	if ((s.right = pr) != null)
2816	>	pr.parent = s;
2817	>	}
2818	>	p.left = null;
2819	>	if ((p.right = sr) != null)
2820	>	sr.parent = p;
2821	>	if ((s.left = pl) != null)
2822	>	pl.parent = s;
2823	>	if ((s.parent = pp) == null)
2824	>	r = s;
2825	>	else if (p == pp.left)
2826	>	pp.left = s;
2827	>	else
2828	>	pp.right = s;
2829	>	if (sr != null)
2830	>	replacement = sr;
2831	>	else
2832	>	replacement = p;
2833	>	}
2834	>	else if (pl != null)
2835	>	replacement = pl;
2836	>	else if (pr != null)
2837	>	replacement = pr;
2838	>	else
2839	>	replacement = p;
2840	>	if (replacement != p) {
2841	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2842	>	if (pp == null)
2843	>	r = replacement;
2844	>	else if (p == pp.left)
2845	>	pp.left = replacement;
2846	>	else
2847	>	pp.right = replacement;
2848	>	p.left = p.right = p.parent = null;
2849	>	}
2850
2851	<	/**
2849	<	* {@inheritDoc}
2850	<	*
2851	<	* @return the previous value associated with the specified key,
2852	<	*         or {@code null} if there was no mapping for the key
2853	<	* @throws NullPointerException if the specified key or value is null
2854	<	*/
2855	<	public V replace(K key, V value) {
2856	<	if (key == null || value == null)
2857	<	throw new NullPointerException();
2858	<	return internalReplace(key, value, null);
2859	<	}
2851	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2852
2853	<	/**
2854	<	* Removes all of the mappings from this map.
2855	<	*/
2856	<	public void clear() {
2857	<	internalClear();
2858	<	}
2853	>	if (p == replacement) {  // detach pointers
2854	>	TreeNode<K,V> pp;
2855	>	if ((pp = p.parent) != null) {
2856	>	if (p == pp.left)
2857	>	pp.left = null;
2858	>	else if (p == pp.right)
2859	>	pp.right = null;
2860	>	p.parent = null;
2861	>	}
2862	>	}
2863	>	} finally {
2864	>	unlockRoot();
2865	>	}
2866	>	assert checkInvariants(root);
2867	>	return false;
2868	>	}
2869
2870	<	/**
2871	<	* Returns a {@link Set} view of the keys contained in this map.
2870	<	* The set is backed by the map, so changes to the map are
2871	<	* reflected in the set, and vice-versa.
2872	<	*
2873	<	* @return the set view
2874	<	*/
2875	<	public KeySetView<K,V> keySet() {
2876	<	KeySetView<K,V> ks = keySet;
2877	<	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2878	<	}
2870	>	/* ------------------------------------------------------------ */
2871	>	// Red-black tree methods, all adapted from CLR
2872
2873	<	/**
2874	<	* Returns a {@link Set} view of the keys in this map, using the
2875	<	* given common mapped value for any additions (i.e., {@link
2876	<	* Collection#add} and {@link Collection#addAll}). This is of
2877	<	* course only appropriate if it is acceptable to use the same
2878	<	* value for all additions from this view.
2879	<	*
2880	<	* @param mappedValue the mapped value to use for any
2881	<	* additions.
2882	<	* @return the set view
2883	<	* @throws NullPointerException if the mappedValue is null
2884	<	*/
2885	<	public KeySetView<K,V> keySet(V mappedValue) {
2886	<	if (mappedValue == null)
2887	<	throw new NullPointerException();
2888	<	return new KeySetView<K,V>(this, mappedValue);
2889	<	}
2873	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2874	>	TreeNode<K,V> p) {
2875	>	TreeNode<K,V> r, pp, rl;
2876	>	if (p != null && (r = p.right) != null) {
2877	>	if ((rl = p.right = r.left) != null)
2878	>	rl.parent = p;
2879	>	if ((pp = r.parent = p.parent) == null)
2880	>	(root = r).red = false;
2881	>	else if (pp.left == p)
2882	>	pp.left = r;
2883	>	else
2884	>	pp.right = r;
2885	>	r.left = p;
2886	>	p.parent = r;
2887	>	}
2888	>	return root;
2889	>	}
2890
2891	<	/**
2892	<	* Returns a {@link Collection} view of the values contained in this map.
2893	<	* The collection is backed by the map, so changes to the map are
2894	<	* reflected in the collection, and vice-versa.
2895	<	*/
2896	<	public ValuesView<K,V> values() {
2897	<	ValuesView<K,V> vs = values;
2898	<	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
2899	<	}
2891	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2892	>	TreeNode<K,V> p) {
2893	>	TreeNode<K,V> l, pp, lr;
2894	>	if (p != null && (l = p.left) != null) {
2895	>	if ((lr = p.left = l.right) != null)
2896	>	lr.parent = p;
2897	>	if ((pp = l.parent = p.parent) == null)
2898	>	(root = l).red = false;
2899	>	else if (pp.right == p)
2900	>	pp.right = l;
2901	>	else
2902	>	pp.left = l;
2903	>	l.right = p;
2904	>	p.parent = l;
2905	>	}
2906	>	return root;
2907	>	}
2908
2909	<	/**
2910	<	* Returns a {@link Set} view of the mappings contained in this map.
2911	<	* The set is backed by the map, so changes to the map are
2912	<	* reflected in the set, and vice-versa.  The set supports element
2913	<	* removal, which removes the corresponding mapping from the map,
2914	<	* via the {@code Iterator.remove}, {@code Set.remove},
2915	<	* {@code removeAll}, {@code retainAll}, and {@code clear}
2916	<	* operations.  It does not support the {@code add} or
2917	<	* {@code addAll} operations.
2918	<	*
2919	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
2920	<	* that will never throw {@link ConcurrentModificationException},
2921	<	* and guarantees to traverse elements as they existed upon
2922	<	* construction of the iterator, and may (but is not guaranteed to)
2923	<	* reflect any modifications subsequent to construction.
2924	<	*/
2925	<	public Set<Map.Entry<K,V>> entrySet() {
2926	<	EntrySetView<K,V> es = entrySet;
2927	<	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
2928	<	}
2909	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2910	>	TreeNode<K,V> x) {
2911	>	x.red = true;
2912	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2913	>	if ((xp = x.parent) == null) {
2914	>	x.red = false;
2915	>	return x;
2916	>	}
2917	>	else if (!xp.red || (xpp = xp.parent) == null)
2918	>	return root;
2919	>	if (xp == (xppl = xpp.left)) {
2920	>	if ((xppr = xpp.right) != null && xppr.red) {
2921	>	xppr.red = false;
2922	>	xp.red = false;
2923	>	xpp.red = true;
2924	>	x = xpp;
2925	>	}
2926	>	else {
2927	>	if (x == xp.right) {
2928	>	root = rotateLeft(root, x = xp);
2929	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2930	>	}
2931	>	if (xp != null) {
2932	>	xp.red = false;
2933	>	if (xpp != null) {
2934	>	xpp.red = true;
2935	>	root = rotateRight(root, xpp);
2936	>	}
2937	>	}
2938	>	}
2939	>	}
2940	>	else {
2941	>	if (xppl != null && xppl.red) {
2942	>	xppl.red = false;
2943	>	xp.red = false;
2944	>	xpp.red = true;
2945	>	x = xpp;
2946	>	}
2947	>	else {
2948	>	if (x == xp.left) {
2949	>	root = rotateRight(root, x = xp);
2950	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2951	>	}
2952	>	if (xp != null) {
2953	>	xp.red = false;
2954	>	if (xpp != null) {
2955	>	xpp.red = true;
2956	>	root = rotateLeft(root, xpp);
2957	>	}
2958	>	}
2959	>	}
2960	>	}
2961	>	}
2962	>	}
2963
2964	<	/**
2965	<	* Returns an enumeration of the keys in this table.
2966	<	*
2967	<	* @return an enumeration of the keys in this table
2968	<	* @see #keySet()
2969	<	*/
2970	<	public Enumeration<K> keys() {
2971	<	return new KeyIterator<K,V>(this);
2972	<	}
2964	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
2965	>	TreeNode<K,V> x) {
2966	>	for (TreeNode<K,V> xp, xpl, xpr;;)  {
2967	>	if (x == null || x == root)
2968	>	return root;
2969	>	else if ((xp = x.parent) == null) {
2970	>	x.red = false;
2971	>	return x;
2972	>	}
2973	>	else if (x.red) {
2974	>	x.red = false;
2975	>	return root;
2976	>	}
2977	>	else if ((xpl = xp.left) == x) {
2978	>	if ((xpr = xp.right) != null && xpr.red) {
2979	>	xpr.red = false;
2980	>	xp.red = true;
2981	>	root = rotateLeft(root, xp);
2982	>	xpr = (xp = x.parent) == null ? null : xp.right;
2983	>	}
2984	>	if (xpr == null)
2985	>	x = xp;
2986	>	else {
2987	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
2988	>	if ((sr == null || !sr.red) &&
2989	>	(sl == null || !sl.red)) {
2990	>	xpr.red = true;
2991	>	x = xp;
2992	>	}
2993	>	else {
2994	>	if (sr == null || !sr.red) {
2995	>	if (sl != null)
2996	>	sl.red = false;
2997	>	xpr.red = true;
2998	>	root = rotateRight(root, xpr);
2999	>	xpr = (xp = x.parent) == null ?
3000	>	null : xp.right;
3001	>	}
3002	>	if (xpr != null) {
3003	>	xpr.red = (xp == null) ? false : xp.red;
3004	>	if ((sr = xpr.right) != null)
3005	>	sr.red = false;
3006	>	}
3007	>	if (xp != null) {
3008	>	xp.red = false;
3009	>	root = rotateLeft(root, xp);
3010	>	}
3011	>	x = root;
3012	>	}
3013	>	}
3014	>	}
3015	>	else { // symmetric
3016	>	if (xpl != null && xpl.red) {
3017	>	xpl.red = false;
3018	>	xp.red = true;
3019	>	root = rotateRight(root, xp);
3020	>	xpl = (xp = x.parent) == null ? null : xp.left;
3021	>	}
3022	>	if (xpl == null)
3023	>	x = xp;
3024	>	else {
3025	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3026	>	if ((sl == null || !sl.red) &&
3027	>	(sr == null || !sr.red)) {
3028	>	xpl.red = true;
3029	>	x = xp;
3030	>	}
3031	>	else {
3032	>	if (sl == null || !sl.red) {
3033	>	if (sr != null)
3034	>	sr.red = false;
3035	>	xpl.red = true;
3036	>	root = rotateLeft(root, xpl);
3037	>	xpl = (xp = x.parent) == null ?
3038	>	null : xp.left;
3039	>	}
3040	>	if (xpl != null) {
3041	>	xpl.red = (xp == null) ? false : xp.red;
3042	>	if ((sl = xpl.left) != null)
3043	>	sl.red = false;
3044	>	}
3045	>	if (xp != null) {
3046	>	xp.red = false;
3047	>	root = rotateRight(root, xp);
3048	>	}
3049	>	x = root;
3050	>	}
3051	>	}
3052	>	}
3053	>	}
3054	>	}
3055
3056	<	/**
3057	<	* Returns an enumeration of the values in this table.
3058	<	*
3059	<	* @return an enumeration of the values in this table
3060	<	* @see #values()
3061	<	*/
3062	<	public Enumeration<V> elements() {
3063	<	return new ValueIterator<K,V>(this);
3064	<	}
3056	>	/**
3057	>	* Recursive invariant check
3058	>	*/
3059	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3060	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3061	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3062	>	if (tb != null && tb.next != t)
3063	>	return false;
3064	>	if (tn != null && tn.prev != t)
3065	>	return false;
3066	>	if (tp != null && t != tp.left && t != tp.right)
3067	>	return false;
3068	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3069	>	return false;
3070	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3071	>	return false;
3072	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3073	>	return false;
3074	>	if (tl != null && !checkInvariants(tl))
3075	>	return false;
3076	>	if (tr != null && !checkInvariants(tr))
3077	>	return false;
3078	>	return true;
3079	>	}
3080
3081	<	/**
3082	<	* Returns a partitionable iterator of the keys in this map.
3083	<	*
3084	<	* @return a partitionable iterator of the keys in this map
3085	<	*/
3086	<	public Spliterator<K> keySpliterator() {
3087	<	return new KeyIterator<K,V>(this);
3081	>	private static final sun.misc.Unsafe U;
3082	>	private static final long LOCKSTATE;
3083	>	static {
3084	>	try {
3085	>	U = getUnsafe();
3086	>	Class<?> k = TreeBin.class;
3087	>	LOCKSTATE = U.objectFieldOffset
3088	>	(k.getDeclaredField("lockState"));
3089	>	} catch (Exception e) {
3090	>	throw new Error(e);
3091	>	}
3092	>	}
3093		}
3094
3095	<	/**
2959	<	* Returns a partitionable iterator of the values in this map.
2960	<	*
2961	<	* @return a partitionable iterator of the values in this map
2962	<	*/
2963	<	public Spliterator<V> valueSpliterator() {
2964	<	return new ValueIterator<K,V>(this);
2965	<	}
3095	>	/* ----------------Table Traversal -------------- */
3096
3097		/**
3098	<	* Returns a partitionable iterator of the entries in this map.
3098	>	* Encapsulates traversal for methods such as containsValue; also
3099	>	* serves as a base class for other iterators and spliterators.
3100		*
3101	<	* @return a partitionable iterator of the entries in this map
3102	<	*/
3103	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
3104	<	return new EntryIterator<K,V>(this);
3105	<	}
3106	<
3107	<	/**
3108	<	* Returns the hash code value for this {@link Map}, i.e.,
2978	<	* the sum of, for each key-value pair in the map,
2979	<	* {@code key.hashCode() ^ value.hashCode()}.
3101	>	* Method advance visits once each still-valid node that was
3102	>	* reachable upon iterator construction. It might miss some that
3103	>	* were added to a bin after the bin was visited, which is OK wrt
3104	>	* consistency guarantees. Maintaining this property in the face
3105	>	* of possible ongoing resizes requires a fair amount of
3106	>	* bookkeeping state that is difficult to optimize away amidst
3107	>	* volatile accesses.  Even so, traversal maintains reasonable
3108	>	* throughput.
3109		*
3110	<	* @return the hash code value for this map
3110	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3111	>	* However, if the table has been resized, then all future steps
3112	>	* must traverse both the bin at the current index as well as at
3113	>	* (index + baseSize); and so on for further resizings. To
3114	>	* paranoically cope with potential sharing by users of iterators
3115	>	* across threads, iteration terminates if a bounds checks fails
3116	>	* for a table read.
3117		*/
3118	<	public int hashCode() {
3119	<	int h = 0;
3120	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3121	<	Object v;
3122	<	while ((v = it.advance()) != null) {
3123	<	h += it.nextKey.hashCode() ^ v.hashCode();
3118	>	static class Traverser<K,V> {
3119	>	Node<K,V>[] tab;        // current table; updated if resized
3120	>	Node<K,V> next;         // the next entry to use
3121	>	int index;              // index of bin to use next
3122	>	int baseIndex;          // current index of initial table
3123	>	int baseLimit;          // index bound for initial table
3124	>	final int baseSize;     // initial table size
3125	>
3126	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3127	>	this.tab = tab;
3128	>	this.baseSize = size;
3129	>	this.baseIndex = this.index = index;
3130	>	this.baseLimit = limit;
3131	>	this.next = null;
3132		}
2990	–	return h;
2991	–	}
3133
3134	<	/**
3135	<	* Returns a string representation of this map.  The string
3136	<	* representation consists of a list of key-value mappings (in no
3137	<	* particular order) enclosed in braces ("{@code {}}").  Adjacent
3138	<	* mappings are separated by the characters {@code ", "} (comma
3139	<	* and space).  Each key-value mapping is rendered as the key
3140	<	* followed by an equals sign ("{@code =}") followed by the
3000	<	* associated value.
3001	<	*
3002	<	* @return a string representation of this map
3003	<	*/
3004	<	public String toString() {
3005	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3006	<	StringBuilder sb = new StringBuilder();
3007	<	sb.append('{');
3008	<	Object v;
3009	<	if ((v = it.advance()) != null) {
3134	>	/**
3135	>	* Advances if possible, returning next valid node, or null if none.
3136	>	*/
3137	>	final Node<K,V> advance() {
3138	>	Node<K,V> e;
3139	>	if ((e = next) != null)
3140	>	e = e.next;
3141		for (;;) {
3142	<	Object k = it.nextKey;
3143	<	sb.append(k == this ? "(this Map)" : k);
3144	<	sb.append('=');
3145	<	sb.append(v == this ? "(this Map)" : v);
3146	<	if ((v = it.advance()) == null)
3147	<	break;
3148	<	sb.append(',').append(' ');
3142	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
3143	>	if (e != null)
3144	>	return next = e;
3145	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3146	>	(n = t.length) <= (i = index) || i < 0)
3147	>	return next = null;
3148	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
3149	>	if (e instanceof ForwardingNode) {
3150	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3151	>	e = null;
3152	>	continue;
3153	>	}
3154	>	else if (e instanceof TreeBin)
3155	>	e = ((TreeBin<K,V>)e).first;
3156	>	else
3157	>	e = null;
3158	>	}
3159	>	if ((index += baseSize) >= n)
3160	>	index = ++baseIndex;    // visit upper slots if present
3161		}
3162		}
3020	–	return sb.append('}').toString();
3163		}
3164
3165		/**
3166	<	* Compares the specified object with this map for equality.
3167	<	* Returns {@code true} if the given object is a map with the same
3026	<	* mappings as this map.  This operation may return misleading
3027	<	* results if either map is concurrently modified during execution
3028	<	* of this method.
3029	<	*
3030	<	* @param o object to be compared for equality with this map
3031	<	* @return {@code true} if the specified object is equal to this map
3166	>	* Base of key, value, and entry Iterators. Adds fields to
3167	>	* Traverser to support iterator.remove.
3168		*/
3169	<	public boolean equals(Object o) {
3170	<	if (o != this) {
3171	<	if (!(o instanceof Map))
3172	<	return false;
3173	<	Map<?,?> m = (Map<?,?>) o;
3174	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3175	<	Object val;
3176	<	while ((val = it.advance()) != null) {
3041	<	Object v = m.get(it.nextKey);
3042	<	if (v == null || (v != val && !v.equals(val)))
3043	<	return false;
3044	<	}
3045	<	for (Map.Entry<?,?> e : m.entrySet()) {
3046	<	Object mk, mv, v;
3047	<	if ((mk = e.getKey()) == null ||
3048	<	(mv = e.getValue()) == null ||
3049	<	(v = internalGet(mk)) == null ||
3050	<	(mv != v && !mv.equals(v)))
3051	<	return false;
3052	<	}
3169	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3170	>	final ConcurrentHashMapV8<K,V> map;
3171	>	Node<K,V> lastReturned;
3172	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3173	>	ConcurrentHashMapV8<K,V> map) {
3174	>	super(tab, size, index, limit);
3175	>	this.map = map;
3176	>	advance();
3177		}
3054	–	return true;
3055	–	}
3178
3179	<	/* ----------------Iterators -------------- */
3179	>	public final boolean hasNext() { return next != null; }
3180	>	public final boolean hasMoreElements() { return next != null; }
3181
3182	<	@SuppressWarnings("serial") static final class KeyIterator<K,V>
3183	<	extends Traverser<K,V,Object>
3184	<	implements Spliterator<K>, Enumeration<K> {
3062	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3063	<	KeyIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3064	<	super(map, it, -1);
3065	<	}
3066	<	public KeyIterator<K,V> split() {
3067	<	if (nextKey != null)
3182	>	public final void remove() {
3183	>	Node<K,V> p;
3184	>	if ((p = lastReturned) == null)
3185		throw new IllegalStateException();
3186	<	return new KeyIterator<K,V>(map, this);
3186	>	lastReturned = null;
3187	>	map.replaceNode(p.key, null, null);
3188		}
3189	<	@SuppressWarnings("unchecked") public final K next() {
3190	<	if (nextVal == null && advance() == null)
3189	>	}
3190	>
3191	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3192	>	implements Iterator<K>, Enumeration<K> {
3193	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3194	>	ConcurrentHashMapV8<K,V> map) {
3195	>	super(tab, index, size, limit, map);
3196	>	}
3197	>
3198	>	public final K next() {
3199	>	Node<K,V> p;
3200	>	if ((p = next) == null)
3201		throw new NoSuchElementException();
3202	<	Object k = nextKey;
3203	<	nextVal = null;
3204	<	return (K) k;
3202	>	K k = p.key;
3203	>	lastReturned = p;
3204	>	advance();
3205	>	return k;
3206		}
3207
3208		public final K nextElement() { return next(); }
3209		}
3210
3211	<	@SuppressWarnings("serial") static final class ValueIterator<K,V>
3212	<	extends Traverser<K,V,Object>
3213	<	implements Spliterator<V>, Enumeration<V> {
3214	<	ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3215	<	ValueIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3087	<	super(map, it, -1);
3088	<	}
3089	<	public ValueIterator<K,V> split() {
3090	<	if (nextKey != null)
3091	<	throw new IllegalStateException();
3092	<	return new ValueIterator<K,V>(map, this);
3211	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3212	>	implements Iterator<V>, Enumeration<V> {
3213	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3214	>	ConcurrentHashMapV8<K,V> map) {
3215	>	super(tab, index, size, limit, map);
3216		}
3217
3218	<	@SuppressWarnings("unchecked") public final V next() {
3219	<	Object v;
3220	<	if ((v = nextVal) == null && (v = advance()) == null)
3218	>	public final V next() {
3219	>	Node<K,V> p;
3220	>	if ((p = next) == null)
3221		throw new NoSuchElementException();
3222	<	nextVal = null;
3223	<	return (V) v;
3222	>	V v = p.val;
3223	>	lastReturned = p;
3224	>	advance();
3225	>	return v;
3226		}
3227
3228		public final V nextElement() { return next(); }
3229		}
3230
3231	<	@SuppressWarnings("serial") static final class EntryIterator<K,V>
3232	<	extends Traverser<K,V,Object>
3233	<	implements Spliterator<Map.Entry<K,V>> {
3234	<	EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3235	<	EntryIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3111	<	super(map, it, -1);
3112	<	}
3113	<	public EntryIterator<K,V> split() {
3114	<	if (nextKey != null)
3115	<	throw new IllegalStateException();
3116	<	return new EntryIterator<K,V>(map, this);
3231	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3232	>	implements Iterator<Map.Entry<K,V>> {
3233	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3234	>	ConcurrentHashMapV8<K,V> map) {
3235	>	super(tab, index, size, limit, map);
3236		}
3237
3238	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3239	<	Object v;
3240	<	if ((v = nextVal) == null && (v = advance()) == null)
3238	>	public final Map.Entry<K,V> next() {
3239	>	Node<K,V> p;
3240	>	if ((p = next) == null)
3241		throw new NoSuchElementException();
3242	<	Object k = nextKey;
3243	<	nextVal = null;
3244	<	return new MapEntry<K,V>((K)k, (V)v, map);
3242	>	K k = p.key;
3243	>	V v = p.val;
3244	>	lastReturned = p;
3245	>	advance();
3246	>	return new MapEntry<K,V>(k, v, map);
3247		}
3248		}
3249
3250		/**
3251	<	* Exported Entry for iterators
3251	>	* Exported Entry for EntryIterator
3252		*/
3253	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3253	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3254		final K key; // non-null
3255		V val;       // non-null
3256	<	final ConcurrentHashMapV8<K, V> map;
3257	<	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3256	>	final ConcurrentHashMapV8<K,V> map;
3257	>	MapEntry(K key, V val, ConcurrentHashMapV8<K,V> map) {
3258		this.key = key;
3259		this.val = val;
3260		this.map = map;
3261		}
3262	<	public final K getKey()       { return key; }
3263	<	public final V getValue()     { return val; }
3264	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3265	<	public final String toString(){ return key + "=" + val; }
3262	>	public K getKey()        { return key; }
3263	>	public V getValue()      { return val; }
3264	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3265	>	public String toString() { return key + "=" + val; }
3266
3267	<	public final boolean equals(Object o) {
3267	>	public boolean equals(Object o) {
3268		Object k, v; Map.Entry<?,?> e;
3269		return ((o instanceof Map.Entry) &&
3270		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3157 | Line 3278 | public class ConcurrentHashMapV8<K, V>
3278		* value to return is somewhat arbitrary here. Since we do not
3279		* necessarily track asynchronous changes, the most recent
3280		* "previous" value could be different from what we return (or
3281	<	* could even have been removed in which case the put will
3281	>	* could even have been removed, in which case the put will
3282		* re-establish). We do not and cannot guarantee more.
3283		*/
3284	<	public final V setValue(V value) {
3284	>	public V setValue(V value) {
3285		if (value == null) throw new NullPointerException();
3286		V v = val;
3287		val = value;
#	Line 3169 | Line 3290 | public class ConcurrentHashMapV8<K, V>
3290		}
3291		}
3292
3293	<	/**
3294	<	* Returns exportable snapshot entry for the given key and value
3295	<	* when write-through can't or shouldn't be used.
3296	<	*/
3297	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
3298	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
3299	<	}
3293	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3294	>	implements ConcurrentHashMapSpliterator<K> {
3295	>	long est;               // size estimate
3296	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3297	>	long est) {
3298	>	super(tab, size, index, limit);
3299	>	this.est = est;
3300	>	}
3301	>
3302	>	public ConcurrentHashMapSpliterator<K> trySplit() {
3303	>	int i, f, h;
3304	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3305	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3306	>	f, est >>>= 1);
3307	>	}
3308
3309	<	/* ---------------- Serialization Support -------------- */
3309	>	public void forEachRemaining(Action<? super K> action) {
3310	>	if (action == null) throw new NullPointerException();
3311	>	for (Node<K,V> p; (p = advance()) != null;)
3312	>	action.apply(p.key);
3313	>	}
3314	>
3315	>	public boolean tryAdvance(Action<? super K> action) {
3316	>	if (action == null) throw new NullPointerException();
3317	>	Node<K,V> p;
3318	>	if ((p = advance()) == null)
3319	>	return false;
3320	>	action.apply(p.key);
3321	>	return true;
3322	>	}
3323	>
3324	>	public long estimateSize() { return est; }
3325
3182	–	/**
3183	–	* Stripped-down version of helper class used in previous version,
3184	–	* declared for the sake of serialization compatibility
3185	–	*/
3186	–	static class Segment<K,V> implements Serializable {
3187	–	private static final long serialVersionUID = 2249069246763182397L;
3188	–	final float loadFactor;
3189	–	Segment(float lf) { this.loadFactor = lf; }
3326		}
3327
3328	<	/**
3329	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
3330	<	* stream (i.e., serializes it).
3331	<	* @param s the stream
3332	<	* @serialData
3333	<	* the key (Object) and value (Object)
3334	<	* for each key-value mapping, followed by a null pair.
3199	<	* The key-value mappings are emitted in no particular order.
3200	<	*/
3201	<	@SuppressWarnings("unchecked") private void writeObject
3202	<	(java.io.ObjectOutputStream s)
3203	<	throws java.io.IOException {
3204	<	if (segments == null) { // for serialization compatibility
3205	<	segments = (Segment<K,V>[])
3206	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
3207	<	for (int i = 0; i < segments.length; ++i)
3208	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
3209	<	}
3210	<	s.defaultWriteObject();
3211	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3212	<	Object v;
3213	<	while ((v = it.advance()) != null) {
3214	<	s.writeObject(it.nextKey);
3215	<	s.writeObject(v);
3328	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3329	>	implements ConcurrentHashMapSpliterator<V> {
3330	>	long est;               // size estimate
3331	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3332	>	long est) {
3333	>	super(tab, size, index, limit);
3334	>	this.est = est;
3335		}
3217	–	s.writeObject(null);
3218	–	s.writeObject(null);
3219	–	segments = null; // throw away
3220	–	}
3336
3337	<	/**
3338	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3339	<	* @param s the stream
3340	<	*/
3341	<	@SuppressWarnings("unchecked") private void readObject
3342	<	(java.io.ObjectInputStream s)
3228	<	throws java.io.IOException, ClassNotFoundException {
3229	<	s.defaultReadObject();
3230	<	this.segments = null; // unneeded
3337	>	public ConcurrentHashMapSpliterator<V> trySplit() {
3338	>	int i, f, h;
3339	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3340	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3341	>	f, est >>>= 1);
3342	>	}
3343
3344	<	// Create all nodes, then place in table once size is known
3345	<	long size = 0L;
3346	<	Node p = null;
3347	<	for (;;) {
3236	<	K k = (K) s.readObject();
3237	<	V v = (V) s.readObject();
3238	<	if (k != null && v != null) {
3239	<	int h = spread(k.hashCode());
3240	<	p = new Node(h, k, v, p);
3241	<	++size;
3242	<	}
3243	<	else
3244	<	break;
3344	>	public void forEachRemaining(Action<? super V> action) {
3345	>	if (action == null) throw new NullPointerException();
3346	>	for (Node<K,V> p; (p = advance()) != null;)
3347	>	action.apply(p.val);
3348		}
3349	<	if (p != null) {
3350	<	boolean init = false;
3351	<	int n;
3352	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3353	<	n = MAXIMUM_CAPACITY;
3354	<	else {
3355	<	int sz = (int)size;
3356	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
3254	<	}
3255	<	int sc = sizeCtl;
3256	<	boolean collide = false;
3257	<	if (n > sc &&
3258	<	U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
3259	<	try {
3260	<	if (table == null) {
3261	<	init = true;
3262	<	Node[] tab = new Node[n];
3263	<	int mask = n - 1;
3264	<	while (p != null) {
3265	<	int j = p.hash & mask;
3266	<	Node next = p.next;
3267	<	Node q = p.next = tabAt(tab, j);
3268	<	setTabAt(tab, j, p);
3269	<	if (!collide && q != null && q.hash == p.hash)
3270	<	collide = true;
3271	<	p = next;
3272	<	}
3273	<	table = tab;
3274	<	addCount(size, -1);
3275	<	sc = n - (n >>> 2);
3276	<	}
3277	<	} finally {
3278	<	sizeCtl = sc;
3279	<	}
3280	<	if (collide) { // rescan and convert to TreeBins
3281	<	Node[] tab = table;
3282	<	for (int i = 0; i < tab.length; ++i) {
3283	<	int c = 0;
3284	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
3285	<	if (++c > TREE_THRESHOLD &&
3286	<	(e.key instanceof Comparable)) {
3287	<	replaceWithTreeBin(tab, i, e.key);
3288	<	break;
3289	<	}
3290	<	}
3291	<	}
3292	<	}
3293	<	}
3294	<	if (!init) { // Can only happen if unsafely published.
3295	<	while (p != null) {
3296	<	internalPut((K)p.key, (V)p.val, false);
3297	<	p = p.next;
3298	<	}
3299	<	}
3349	>
3350	>	public boolean tryAdvance(Action<? super V> action) {
3351	>	if (action == null) throw new NullPointerException();
3352	>	Node<K,V> p;
3353	>	if ((p = advance()) == null)
3354	>	return false;
3355	>	action.apply(p.val);
3356	>	return true;
3357		}
3358	+
3359	+	public long estimateSize() { return est; }
3360	+
3361		}
3362
3363	<	// -------------------------------------------------------
3363	>	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3364	>	implements ConcurrentHashMapSpliterator<Map.Entry<K,V>> {
3365	>	final ConcurrentHashMapV8<K,V> map; // To export MapEntry
3366	>	long est;               // size estimate
3367	>	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3368	>	long est, ConcurrentHashMapV8<K,V> map) {
3369	>	super(tab, size, index, limit);
3370	>	this.map = map;
3371	>	this.est = est;
3372	>	}
3373
3374	<	// Sams
3375	<	/** Interface describing a void action of one argument */
3376	<	public interface Action<A> { void apply(A a); }
3377	<	/** Interface describing a void action of two arguments */
3378	<	public interface BiAction<A,B> { void apply(A a, B b); }
3379	<	/** Interface describing a function of one argument */
3311	<	public interface Fun<A,T> { T apply(A a); }
3312	<	/** Interface describing a function of two arguments */
3313	<	public interface BiFun<A,B,T> { T apply(A a, B b); }
3314	<	/** Interface describing a function of no arguments */
3315	<	public interface Generator<T> { T apply(); }
3316	<	/** Interface describing a function mapping its argument to a double */
3317	<	public interface ObjectToDouble<A> { double apply(A a); }
3318	<	/** Interface describing a function mapping its argument to a long */
3319	<	public interface ObjectToLong<A> { long apply(A a); }
3320	<	/** Interface describing a function mapping its argument to an int */
3321	<	public interface ObjectToInt<A> {int apply(A a); }
3322	<	/** Interface describing a function mapping two arguments to a double */
3323	<	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
3324	<	/** Interface describing a function mapping two arguments to a long */
3325	<	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
3326	<	/** Interface describing a function mapping two arguments to an int */
3327	<	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
3328	<	/** Interface describing a function mapping a double to a double */
3329	<	public interface DoubleToDouble { double apply(double a); }
3330	<	/** Interface describing a function mapping a long to a long */
3331	<	public interface LongToLong { long apply(long a); }
3332	<	/** Interface describing a function mapping an int to an int */
3333	<	public interface IntToInt { int apply(int a); }
3334	<	/** Interface describing a function mapping two doubles to a double */
3335	<	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3336	<	/** Interface describing a function mapping two longs to a long */
3337	<	public interface LongByLongToLong { long apply(long a, long b); }
3338	<	/** Interface describing a function mapping two ints to an int */
3339	<	public interface IntByIntToInt { int apply(int a, int b); }
3374	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> trySplit() {
3375	>	int i, f, h;
3376	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3377	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3378	>	f, est >>>= 1, map);
3379	>	}
3380
3381	+	public void forEachRemaining(Action<? super Map.Entry<K,V>> action) {
3382	+	if (action == null) throw new NullPointerException();
3383	+	for (Node<K,V> p; (p = advance()) != null; )
3384	+	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3385	+	}
3386
3387	<	// -------------------------------------------------------
3387	>	public boolean tryAdvance(Action<? super Map.Entry<K,V>> action) {
3388	>	if (action == null) throw new NullPointerException();
3389	>	Node<K,V> p;
3390	>	if ((p = advance()) == null)
3391	>	return false;
3392	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3393	>	return true;
3394	>	}
3395	>
3396	>	public long estimateSize() { return est; }
3397	>
3398	>	}
3399	>
3400	>	// Parallel bulk operations
3401	>
3402	>	/**
3403	>	* Computes initial batch value for bulk tasks. The returned value
3404	>	* is approximately exp2 of the number of times (minus one) to
3405	>	* split task by two before executing leaf action. This value is
3406	>	* faster to compute and more convenient to use as a guide to
3407	>	* splitting than is the depth, since it is used while dividing by
3408	>	* two anyway.
3409	>	*/
3410	>	final int batchFor(long b) {
3411	>	long n;
3412	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3413	>	return 0;
3414	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3415	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3416	>	}
3417
3418		/**
3419		* Performs the given action for each (key, value).
3420		*
3421	+	* @param parallelismThreshold the (estimated) number of elements
3422	+	* needed for this operation to be executed in parallel
3423		* @param action the action
3424	+	* @since 1.8
3425		*/
3426	<	public void forEach(BiAction<K,V> action) {
3427	<	ForkJoinTasks.forEach
3428	<	(this, action).invoke();
3426	>	public void forEach(long parallelismThreshold,
3427	>	BiAction<? super K,? super V> action) {
3428	>	if (action == null) throw new NullPointerException();
3429	>	new ForEachMappingTask<K,V>
3430	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3431	>	action).invoke();
3432		}
3433
3434		/**
3435		* Performs the given action for each non-null transformation
3436		* of each (key, value).
3437		*
3438	+	* @param parallelismThreshold the (estimated) number of elements
3439	+	* needed for this operation to be executed in parallel
3440		* @param transformer a function returning the transformation
3441	<	* for an element, or null of there is no transformation (in
3442	<	* which case the action is not applied).
3441	>	* for an element, or null if there is no transformation (in
3442	>	* which case the action is not applied)
3443		* @param action the action
3444	+	* @since 1.8
3445		*/
3446	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3447	<	Action<U> action) {
3448	<	ForkJoinTasks.forEach
3449	<	(this, transformer, action).invoke();
3446	>	public <U> void forEach(long parallelismThreshold,
3447	>	BiFun<? super K, ? super V, ? extends U> transformer,
3448	>	Action<? super U> action) {
3449	>	if (transformer == null || action == null)
3450	>	throw new NullPointerException();
3451	>	new ForEachTransformedMappingTask<K,V,U>
3452	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3453	>	transformer, action).invoke();
3454		}
3455
3456		/**
#	Line 3373 | Line 3460 | public class ConcurrentHashMapV8<K, V>
3460		* results of any other parallel invocations of the search
3461		* function are ignored.
3462		*
3463	+	* @param parallelismThreshold the (estimated) number of elements
3464	+	* needed for this operation to be executed in parallel
3465		* @param searchFunction a function returning a non-null
3466		* result on success, else null
3467		* @return a non-null result from applying the given search
3468		* function on each (key, value), or null if none
3469	+	* @since 1.8
3470		*/
3471	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3472	<	return ForkJoinTasks.search
3473	<	(this, searchFunction).invoke();
3471	>	public <U> U search(long parallelismThreshold,
3472	>	BiFun<? super K, ? super V, ? extends U> searchFunction) {
3473	>	if (searchFunction == null) throw new NullPointerException();
3474	>	return new SearchMappingsTask<K,V,U>
3475	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3476	>	searchFunction, new AtomicReference<U>()).invoke();
3477		}
3478
3479		/**
#	Line 3388 | Line 3481 | public class ConcurrentHashMapV8<K, V>
3481		* of all (key, value) pairs using the given reducer to
3482		* combine values, or null if none.
3483		*
3484	+	* @param parallelismThreshold the (estimated) number of elements
3485	+	* needed for this operation to be executed in parallel
3486		* @param transformer a function returning the transformation
3487	<	* for an element, or null of there is no transformation (in
3488	<	* which case it is not combined).
3487	>	* for an element, or null if there is no transformation (in
3488	>	* which case it is not combined)
3489		* @param reducer a commutative associative combining function
3490		* @return the result of accumulating the given transformation
3491		* of all (key, value) pairs
3492	+	* @since 1.8
3493		*/
3494	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3494	>	public <U> U reduce(long parallelismThreshold,
3495	>	BiFun<? super K, ? super V, ? extends U> transformer,
3496		BiFun<? super U, ? super U, ? extends U> reducer) {
3497	<	return ForkJoinTasks.reduce
3498	<	(this, transformer, reducer).invoke();
3497	>	if (transformer == null || reducer == null)
3498	>	throw new NullPointerException();
3499	>	return new MapReduceMappingsTask<K,V,U>
3500	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3501	>	null, transformer, reducer).invoke();
3502		}
3503
3504		/**
#	Line 3406 | Line 3506 | public class ConcurrentHashMapV8<K, V>
3506		* of all (key, value) pairs using the given reducer to
3507		* combine values, and the given basis as an identity value.
3508		*
3509	+	* @param parallelismThreshold the (estimated) number of elements
3510	+	* needed for this operation to be executed in parallel
3511		* @param transformer a function returning the transformation
3512		* for an element
3513		* @param basis the identity (initial default value) for the reduction
3514		* @param reducer a commutative associative combining function
3515		* @return the result of accumulating the given transformation
3516		* of all (key, value) pairs
3517	+	* @since 1.8
3518		*/
3519	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3519	>	public double reduceToDouble(long parallelismThreshold,
3520	>	ObjectByObjectToDouble<? super K, ? super V> transformer,
3521		double basis,
3522		DoubleByDoubleToDouble reducer) {
3523	<	return ForkJoinTasks.reduceToDouble
3524	<	(this, transformer, basis, reducer).invoke();
3523	>	if (transformer == null || reducer == null)
3524	>	throw new NullPointerException();
3525	>	return new MapReduceMappingsToDoubleTask<K,V>
3526	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3527	>	null, transformer, basis, reducer).invoke();
3528		}
3529
3530		/**
#	Line 3425 | Line 3532 | public class ConcurrentHashMapV8<K, V>
3532		* of all (key, value) pairs using the given reducer to
3533		* combine values, and the given basis as an identity value.
3534		*
3535	+	* @param parallelismThreshold the (estimated) number of elements
3536	+	* needed for this operation to be executed in parallel
3537		* @param transformer a function returning the transformation
3538		* for an element
3539		* @param basis the identity (initial default value) for the reduction
3540		* @param reducer a commutative associative combining function
3541		* @return the result of accumulating the given transformation
3542		* of all (key, value) pairs
3543	+	* @since 1.8
3544		*/
3545	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3545	>	public long reduceToLong(long parallelismThreshold,
3546	>	ObjectByObjectToLong<? super K, ? super V> transformer,
3547		long basis,
3548		LongByLongToLong reducer) {
3549	<	return ForkJoinTasks.reduceToLong
3550	<	(this, transformer, basis, reducer).invoke();
3549	>	if (transformer == null || reducer == null)
3550	>	throw new NullPointerException();
3551	>	return new MapReduceMappingsToLongTask<K,V>
3552	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3553	>	null, transformer, basis, reducer).invoke();
3554		}
3555
3556		/**
#	Line 3444 | Line 3558 | public class ConcurrentHashMapV8<K, V>
3558		* of all (key, value) pairs using the given reducer to
3559		* combine values, and the given basis as an identity value.
3560		*
3561	+	* @param parallelismThreshold the (estimated) number of elements
3562	+	* needed for this operation to be executed in parallel
3563		* @param transformer a function returning the transformation
3564		* for an element
3565		* @param basis the identity (initial default value) for the reduction
3566		* @param reducer a commutative associative combining function
3567		* @return the result of accumulating the given transformation
3568		* of all (key, value) pairs
3569	+	* @since 1.8
3570		*/
3571	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3571	>	public int reduceToInt(long parallelismThreshold,
3572	>	ObjectByObjectToInt<? super K, ? super V> transformer,
3573		int basis,
3574		IntByIntToInt reducer) {
3575	<	return ForkJoinTasks.reduceToInt
3576	<	(this, transformer, basis, reducer).invoke();
3575	>	if (transformer == null || reducer == null)
3576	>	throw new NullPointerException();
3577	>	return new MapReduceMappingsToIntTask<K,V>
3578	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3579	>	null, transformer, basis, reducer).invoke();
3580		}
3581
3582		/**
3583		* Performs the given action for each key.
3584		*
3585	+	* @param parallelismThreshold the (estimated) number of elements
3586	+	* needed for this operation to be executed in parallel
3587		* @param action the action
3588	+	* @since 1.8
3589		*/
3590	<	public void forEachKey(Action<K> action) {
3591	<	ForkJoinTasks.forEachKey
3592	<	(this, action).invoke();
3590	>	public void forEachKey(long parallelismThreshold,
3591	>	Action<? super K> action) {
3592	>	if (action == null) throw new NullPointerException();
3593	>	new ForEachKeyTask<K,V>
3594	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3595	>	action).invoke();
3596		}
3597
3598		/**
3599		* Performs the given action for each non-null transformation
3600		* of each key.
3601		*
3602	+	* @param parallelismThreshold the (estimated) number of elements
3603	+	* needed for this operation to be executed in parallel
3604		* @param transformer a function returning the transformation
3605	<	* for an element, or null of there is no transformation (in
3606	<	* which case the action is not applied).
3605	>	* for an element, or null if there is no transformation (in
3606	>	* which case the action is not applied)
3607		* @param action the action
3608	+	* @since 1.8
3609		*/
3610	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3611	<	Action<U> action) {
3612	<	ForkJoinTasks.forEachKey
3613	<	(this, transformer, action).invoke();
3610	>	public <U> void forEachKey(long parallelismThreshold,
3611	>	Fun<? super K, ? extends U> transformer,
3612	>	Action<? super U> action) {
3613	>	if (transformer == null || action == null)
3614	>	throw new NullPointerException();
3615	>	new ForEachTransformedKeyTask<K,V,U>
3616	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3617	>	transformer, action).invoke();
3618		}
3619
3620		/**
#	Line 3490 | Line 3624 | public class ConcurrentHashMapV8<K, V>
3624		* any other parallel invocations of the search function are
3625		* ignored.
3626		*
3627	+	* @param parallelismThreshold the (estimated) number of elements
3628	+	* needed for this operation to be executed in parallel
3629		* @param searchFunction a function returning a non-null
3630		* result on success, else null
3631		* @return a non-null result from applying the given search
3632		* function on each key, or null if none
3633	+	* @since 1.8
3634		*/
3635	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3636	<	return ForkJoinTasks.searchKeys
3637	<	(this, searchFunction).invoke();
3635	>	public <U> U searchKeys(long parallelismThreshold,
3636	>	Fun<? super K, ? extends U> searchFunction) {
3637	>	if (searchFunction == null) throw new NullPointerException();
3638	>	return new SearchKeysTask<K,V,U>
3639	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3640	>	searchFunction, new AtomicReference<U>()).invoke();
3641		}
3642
3643		/**
3644		* Returns the result of accumulating all keys using the given
3645		* reducer to combine values, or null if none.
3646		*
3647	+	* @param parallelismThreshold the (estimated) number of elements
3648	+	* needed for this operation to be executed in parallel
3649		* @param reducer a commutative associative combining function
3650		* @return the result of accumulating all keys using the given
3651		* reducer to combine values, or null if none
3652	+	* @since 1.8
3653		*/
3654	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3655	<	return ForkJoinTasks.reduceKeys
3656	<	(this, reducer).invoke();
3654	>	public K reduceKeys(long parallelismThreshold,
3655	>	BiFun<? super K, ? super K, ? extends K> reducer) {
3656	>	if (reducer == null) throw new NullPointerException();
3657	>	return new ReduceKeysTask<K,V>
3658	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3659	>	null, reducer).invoke();
3660		}
3661
3662		/**
#	Line 3518 | Line 3664 | public class ConcurrentHashMapV8<K, V>
3664		* of all keys using the given reducer to combine values, or
3665		* null if none.
3666		*
3667	+	* @param parallelismThreshold the (estimated) number of elements
3668	+	* needed for this operation to be executed in parallel
3669		* @param transformer a function returning the transformation
3670	<	* for an element, or null of there is no transformation (in
3671	<	* which case it is not combined).
3670	>	* for an element, or null if there is no transformation (in
3671	>	* which case it is not combined)
3672		* @param reducer a commutative associative combining function
3673		* @return the result of accumulating the given transformation
3674		* of all keys
3675	+	* @since 1.8
3676		*/
3677	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3678	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3679	<	return ForkJoinTasks.reduceKeys
3680	<	(this, transformer, reducer).invoke();
3677	>	public <U> U reduceKeys(long parallelismThreshold,
3678	>	Fun<? super K, ? extends U> transformer,
3679	>	BiFun<? super U, ? super U, ? extends U> reducer) {
3680	>	if (transformer == null || reducer == null)
3681	>	throw new NullPointerException();
3682	>	return new MapReduceKeysTask<K,V,U>
3683	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3684	>	null, transformer, reducer).invoke();
3685		}
3686
3687		/**
#	Line 3536 | Line 3689 | public class ConcurrentHashMapV8<K, V>
3689		* of all keys using the given reducer to combine values, and
3690		* the given basis as an identity value.
3691		*
3692	+	* @param parallelismThreshold the (estimated) number of elements
3693	+	* needed for this operation to be executed in parallel
3694		* @param transformer a function returning the transformation
3695		* for an element
3696		* @param basis the identity (initial default value) for the reduction
3697		* @param reducer a commutative associative combining function
3698	<	* @return  the result of accumulating the given transformation
3698	>	* @return the result of accumulating the given transformation
3699		* of all keys
3700	+	* @since 1.8
3701		*/
3702	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3702	>	public double reduceKeysToDouble(long parallelismThreshold,
3703	>	ObjectToDouble<? super K> transformer,
3704		double basis,
3705		DoubleByDoubleToDouble reducer) {
3706	<	return ForkJoinTasks.reduceKeysToDouble
3707	<	(this, transformer, basis, reducer).invoke();
3706	>	if (transformer == null || reducer == null)
3707	>	throw new NullPointerException();
3708	>	return new MapReduceKeysToDoubleTask<K,V>
3709	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3710	>	null, transformer, basis, reducer).invoke();
3711		}
3712
3713		/**
#	Line 3555 | Line 3715 | public class ConcurrentHashMapV8<K, V>
3715		* of all keys using the given reducer to combine values, and
3716		* the given basis as an identity value.
3717		*
3718	+	* @param parallelismThreshold the (estimated) number of elements
3719	+	* needed for this operation to be executed in parallel
3720		* @param transformer a function returning the transformation
3721		* for an element
3722		* @param basis the identity (initial default value) for the reduction
3723		* @param reducer a commutative associative combining function
3724		* @return the result of accumulating the given transformation
3725		* of all keys
3726	+	* @since 1.8
3727		*/
3728	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3728	>	public long reduceKeysToLong(long parallelismThreshold,
3729	>	ObjectToLong<? super K> transformer,
3730		long basis,
3731		LongByLongToLong reducer) {
3732	<	return ForkJoinTasks.reduceKeysToLong
3733	<	(this, transformer, basis, reducer).invoke();
3732	>	if (transformer == null || reducer == null)
3733	>	throw new NullPointerException();
3734	>	return new MapReduceKeysToLongTask<K,V>
3735	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3736	>	null, transformer, basis, reducer).invoke();
3737		}
3738
3739		/**
#	Line 3574 | Line 3741 | public class ConcurrentHashMapV8<K, V>
3741		* of all keys using the given reducer to combine values, and
3742		* the given basis as an identity value.
3743		*
3744	+	* @param parallelismThreshold the (estimated) number of elements
3745	+	* needed for this operation to be executed in parallel
3746		* @param transformer a function returning the transformation
3747		* for an element
3748		* @param basis the identity (initial default value) for the reduction
3749		* @param reducer a commutative associative combining function
3750		* @return the result of accumulating the given transformation
3751		* of all keys
3752	+	* @since 1.8
3753		*/
3754	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3754	>	public int reduceKeysToInt(long parallelismThreshold,
3755	>	ObjectToInt<? super K> transformer,
3756		int basis,
3757		IntByIntToInt reducer) {
3758	<	return ForkJoinTasks.reduceKeysToInt
3759	<	(this, transformer, basis, reducer).invoke();
3758	>	if (transformer == null || reducer == null)
3759	>	throw new NullPointerException();
3760	>	return new MapReduceKeysToIntTask<K,V>
3761	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3762	>	null, transformer, basis, reducer).invoke();
3763		}
3764
3765		/**
3766		* Performs the given action for each value.
3767		*
3768	+	* @param parallelismThreshold the (estimated) number of elements
3769	+	* needed for this operation to be executed in parallel
3770		* @param action the action
3771	+	* @since 1.8
3772		*/
3773	<	public void forEachValue(Action<V> action) {
3774	<	ForkJoinTasks.forEachValue
3775	<	(this, action).invoke();
3773	>	public void forEachValue(long parallelismThreshold,
3774	>	Action<? super V> action) {
3775	>	if (action == null)
3776	>	throw new NullPointerException();
3777	>	new ForEachValueTask<K,V>
3778	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3779	>	action).invoke();
3780		}
3781
3782		/**
3783		* Performs the given action for each non-null transformation
3784		* of each value.
3785		*
3786	+	* @param parallelismThreshold the (estimated) number of elements
3787	+	* needed for this operation to be executed in parallel
3788		* @param transformer a function returning the transformation
3789	<	* for an element, or null of there is no transformation (in
3790	<	* which case the action is not applied).
3789	>	* for an element, or null if there is no transformation (in
3790	>	* which case the action is not applied)
3791	>	* @param action the action
3792	>	* @since 1.8
3793		*/
3794	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3795	<	Action<U> action) {
3796	<	ForkJoinTasks.forEachValue
3797	<	(this, transformer, action).invoke();
3794	>	public <U> void forEachValue(long parallelismThreshold,
3795	>	Fun<? super V, ? extends U> transformer,
3796	>	Action<? super U> action) {
3797	>	if (transformer == null || action == null)
3798	>	throw new NullPointerException();
3799	>	new ForEachTransformedValueTask<K,V,U>
3800	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3801	>	transformer, action).invoke();
3802		}
3803
3804		/**
#	Line 3619 | Line 3808 | public class ConcurrentHashMapV8<K, V>
3808		* any other parallel invocations of the search function are
3809		* ignored.
3810		*
3811	+	* @param parallelismThreshold the (estimated) number of elements
3812	+	* needed for this operation to be executed in parallel
3813		* @param searchFunction a function returning a non-null
3814		* result on success, else null
3815		* @return a non-null result from applying the given search
3816		* function on each value, or null if none
3817	<	*
3817	>	* @since 1.8
3818		*/
3819	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3820	<	return ForkJoinTasks.searchValues
3821	<	(this, searchFunction).invoke();
3819	>	public <U> U searchValues(long parallelismThreshold,
3820	>	Fun<? super V, ? extends U> searchFunction) {
3821	>	if (searchFunction == null) throw new NullPointerException();
3822	>	return new SearchValuesTask<K,V,U>
3823	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3824	>	searchFunction, new AtomicReference<U>()).invoke();
3825		}
3826
3827		/**
3828		* Returns the result of accumulating all values using the
3829		* given reducer to combine values, or null if none.
3830		*
3831	+	* @param parallelismThreshold the (estimated) number of elements
3832	+	* needed for this operation to be executed in parallel
3833		* @param reducer a commutative associative combining function
3834	<	* @return  the result of accumulating all values
3834	>	* @return the result of accumulating all values
3835	>	* @since 1.8
3836		*/
3837	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3838	<	return ForkJoinTasks.reduceValues
3839	<	(this, reducer).invoke();
3837	>	public V reduceValues(long parallelismThreshold,
3838	>	BiFun<? super V, ? super V, ? extends V> reducer) {
3839	>	if (reducer == null) throw new NullPointerException();
3840	>	return new ReduceValuesTask<K,V>
3841	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3842	>	null, reducer).invoke();
3843		}
3844
3845		/**
#	Line 3647 | Line 3847 | public class ConcurrentHashMapV8<K, V>
3847		* of all values using the given reducer to combine values, or
3848		* null if none.
3849		*
3850	+	* @param parallelismThreshold the (estimated) number of elements
3851	+	* needed for this operation to be executed in parallel
3852		* @param transformer a function returning the transformation
3853	<	* for an element, or null of there is no transformation (in
3854	<	* which case it is not combined).
3853	>	* for an element, or null if there is no transformation (in
3854	>	* which case it is not combined)
3855		* @param reducer a commutative associative combining function
3856		* @return the result of accumulating the given transformation
3857		* of all values
3858	+	* @since 1.8
3859		*/
3860	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3860	>	public <U> U reduceValues(long parallelismThreshold,
3861	>	Fun<? super V, ? extends U> transformer,
3862		BiFun<? super U, ? super U, ? extends U> reducer) {
3863	<	return ForkJoinTasks.reduceValues
3864	<	(this, transformer, reducer).invoke();
3863	>	if (transformer == null || reducer == null)
3864	>	throw new NullPointerException();
3865	>	return new MapReduceValuesTask<K,V,U>
3866	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3867	>	null, transformer, reducer).invoke();
3868		}
3869
3870		/**
#	Line 3665 | Line 3872 | public class ConcurrentHashMapV8<K, V>
3872		* of all values using the given reducer to combine values,
3873		* and the given basis as an identity value.
3874		*
3875	+	* @param parallelismThreshold the (estimated) number of elements
3876	+	* needed for this operation to be executed in parallel
3877		* @param transformer a function returning the transformation
3878		* for an element
3879		* @param basis the identity (initial default value) for the reduction
3880		* @param reducer a commutative associative combining function
3881		* @return the result of accumulating the given transformation
3882		* of all values
3883	+	* @since 1.8
3884		*/
3885	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
3885	>	public double reduceValuesToDouble(long parallelismThreshold,
3886	>	ObjectToDouble<? super V> transformer,
3887		double basis,
3888		DoubleByDoubleToDouble reducer) {
3889	<	return ForkJoinTasks.reduceValuesToDouble
3890	<	(this, transformer, basis, reducer).invoke();
3889	>	if (transformer == null || reducer == null)
3890	>	throw new NullPointerException();
3891	>	return new MapReduceValuesToDoubleTask<K,V>
3892	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3893	>	null, transformer, basis, reducer).invoke();
3894		}
3895
3896		/**
#	Line 3684 | Line 3898 | public class ConcurrentHashMapV8<K, V>
3898		* of all values using the given reducer to combine values,
3899		* and the given basis as an identity value.
3900		*
3901	+	* @param parallelismThreshold the (estimated) number of elements
3902	+	* needed for this operation to be executed in parallel
3903		* @param transformer a function returning the transformation
3904		* for an element
3905		* @param basis the identity (initial default value) for the reduction
3906		* @param reducer a commutative associative combining function
3907		* @return the result of accumulating the given transformation
3908		* of all values
3909	+	* @since 1.8
3910		*/
3911	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
3911	>	public long reduceValuesToLong(long parallelismThreshold,
3912	>	ObjectToLong<? super V> transformer,
3913		long basis,
3914		LongByLongToLong reducer) {
3915	<	return ForkJoinTasks.reduceValuesToLong
3916	<	(this, transformer, basis, reducer).invoke();
3915	>	if (transformer == null || reducer == null)
3916	>	throw new NullPointerException();
3917	>	return new MapReduceValuesToLongTask<K,V>
3918	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3919	>	null, transformer, basis, reducer).invoke();
3920		}
3921
3922		/**
#	Line 3703 | Line 3924 | public class ConcurrentHashMapV8<K, V>
3924		* of all values using the given reducer to combine values,
3925		* and the given basis as an identity value.
3926		*
3927	+	* @param parallelismThreshold the (estimated) number of elements
3928	+	* needed for this operation to be executed in parallel
3929		* @param transformer a function returning the transformation
3930		* for an element
3931		* @param basis the identity (initial default value) for the reduction
3932		* @param reducer a commutative associative combining function
3933		* @return the result of accumulating the given transformation
3934		* of all values
3935	+	* @since 1.8
3936		*/
3937	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
3937	>	public int reduceValuesToInt(long parallelismThreshold,
3938	>	ObjectToInt<? super V> transformer,
3939		int basis,
3940		IntByIntToInt reducer) {
3941	<	return ForkJoinTasks.reduceValuesToInt
3942	<	(this, transformer, basis, reducer).invoke();
3941	>	if (transformer == null || reducer == null)
3942	>	throw new NullPointerException();
3943	>	return new MapReduceValuesToIntTask<K,V>
3944	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3945	>	null, transformer, basis, reducer).invoke();
3946		}
3947
3948		/**
3949		* Performs the given action for each entry.
3950		*
3951	+	* @param parallelismThreshold the (estimated) number of elements
3952	+	* needed for this operation to be executed in parallel
3953		* @param action the action
3954	+	* @since 1.8
3955		*/
3956	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
3957	<	ForkJoinTasks.forEachEntry
3958	<	(this, action).invoke();
3956	>	public void forEachEntry(long parallelismThreshold,
3957	>	Action<? super Map.Entry<K,V>> action) {
3958	>	if (action == null) throw new NullPointerException();
3959	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
3960	>	action).invoke();
3961		}
3962
3963		/**
3964		* Performs the given action for each non-null transformation
3965		* of each entry.
3966		*
3967	+	* @param parallelismThreshold the (estimated) number of elements
3968	+	* needed for this operation to be executed in parallel
3969		* @param transformer a function returning the transformation
3970	<	* for an element, or null of there is no transformation (in
3971	<	* which case the action is not applied).
3970	>	* for an element, or null if there is no transformation (in
3971	>	* which case the action is not applied)
3972		* @param action the action
3973	+	* @since 1.8
3974		*/
3975	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
3976	<	Action<U> action) {
3977	<	ForkJoinTasks.forEachEntry
3978	<	(this, transformer, action).invoke();
3975	>	public <U> void forEachEntry(long parallelismThreshold,
3976	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
3977	>	Action<? super U> action) {
3978	>	if (transformer == null || action == null)
3979	>	throw new NullPointerException();
3980	>	new ForEachTransformedEntryTask<K,V,U>
3981	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3982	>	transformer, action).invoke();
3983		}
3984
3985		/**
#	Line 3749 | Line 3989 | public class ConcurrentHashMapV8<K, V>
3989		* any other parallel invocations of the search function are
3990		* ignored.
3991		*
3992	+	* @param parallelismThreshold the (estimated) number of elements
3993	+	* needed for this operation to be executed in parallel
3994		* @param searchFunction a function returning a non-null
3995		* result on success, else null
3996		* @return a non-null result from applying the given search
3997		* function on each entry, or null if none
3998	+	* @since 1.8
3999		*/
4000	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4001	<	return ForkJoinTasks.searchEntries
4002	<	(this, searchFunction).invoke();
4000	>	public <U> U searchEntries(long parallelismThreshold,
4001	>	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4002	>	if (searchFunction == null) throw new NullPointerException();
4003	>	return new SearchEntriesTask<K,V,U>
4004	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4005	>	searchFunction, new AtomicReference<U>()).invoke();
4006		}
4007
4008		/**
4009		* Returns the result of accumulating all entries using the
4010		* given reducer to combine values, or null if none.
4011		*
4012	+	* @param parallelismThreshold the (estimated) number of elements
4013	+	* needed for this operation to be executed in parallel
4014		* @param reducer a commutative associative combining function
4015		* @return the result of accumulating all entries
4016	+	* @since 1.8
4017		*/
4018	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4019	<	return ForkJoinTasks.reduceEntries
4020	<	(this, reducer).invoke();
4018	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4019	>	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4020	>	if (reducer == null) throw new NullPointerException();
4021	>	return new ReduceEntriesTask<K,V>
4022	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4023	>	null, reducer).invoke();
4024		}
4025
4026		/**
#	Line 3776 | Line 4028 | public class ConcurrentHashMapV8<K, V>
4028		* of all entries using the given reducer to combine values,
4029		* or null if none.
4030		*
4031	+	* @param parallelismThreshold the (estimated) number of elements
4032	+	* needed for this operation to be executed in parallel
4033		* @param transformer a function returning the transformation
4034	<	* for an element, or null of there is no transformation (in
4035	<	* which case it is not combined).
4034	>	* for an element, or null if there is no transformation (in
4035	>	* which case it is not combined)
4036		* @param reducer a commutative associative combining function
4037		* @return the result of accumulating the given transformation
4038		* of all entries
4039	+	* @since 1.8
4040		*/
4041	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4041	>	public <U> U reduceEntries(long parallelismThreshold,
4042	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4043		BiFun<? super U, ? super U, ? extends U> reducer) {
4044	<	return ForkJoinTasks.reduceEntries
4045	<	(this, transformer, reducer).invoke();
4044	>	if (transformer == null || reducer == null)
4045	>	throw new NullPointerException();
4046	>	return new MapReduceEntriesTask<K,V,U>
4047	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4048	>	null, transformer, reducer).invoke();
4049		}
4050
4051		/**
#	Line 3794 | Line 4053 | public class ConcurrentHashMapV8<K, V>
4053		* of all entries using the given reducer to combine values,
4054		* and the given basis as an identity value.
4055		*
4056	+	* @param parallelismThreshold the (estimated) number of elements
4057	+	* needed for this operation to be executed in parallel
4058		* @param transformer a function returning the transformation
4059		* for an element
4060		* @param basis the identity (initial default value) for the reduction
4061		* @param reducer a commutative associative combining function
4062		* @return the result of accumulating the given transformation
4063		* of all entries
4064	+	* @since 1.8
4065		*/
4066	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4066	>	public double reduceEntriesToDouble(long parallelismThreshold,
4067	>	ObjectToDouble<Map.Entry<K,V>> transformer,
4068		double basis,
4069		DoubleByDoubleToDouble reducer) {
4070	<	return ForkJoinTasks.reduceEntriesToDouble
4071	<	(this, transformer, basis, reducer).invoke();
4070	>	if (transformer == null || reducer == null)
4071	>	throw new NullPointerException();
4072	>	return new MapReduceEntriesToDoubleTask<K,V>
4073	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4074	>	null, transformer, basis, reducer).invoke();
4075		}
4076
4077		/**
#	Line 3813 | Line 4079 | public class ConcurrentHashMapV8<K, V>
4079		* of all entries using the given reducer to combine values,
4080		* and the given basis as an identity value.
4081		*
4082	+	* @param parallelismThreshold the (estimated) number of elements
4083	+	* needed for this operation to be executed in parallel
4084		* @param transformer a function returning the transformation
4085		* for an element
4086		* @param basis the identity (initial default value) for the reduction
4087		* @param reducer a commutative associative combining function
4088	<	* @return  the result of accumulating the given transformation
4088	>	* @return the result of accumulating the given transformation
4089		* of all entries
4090	+	* @since 1.8
4091		*/
4092	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4092	>	public long reduceEntriesToLong(long parallelismThreshold,
4093	>	ObjectToLong<Map.Entry<K,V>> transformer,
4094		long basis,
4095		LongByLongToLong reducer) {
4096	<	return ForkJoinTasks.reduceEntriesToLong
4097	<	(this, transformer, basis, reducer).invoke();
4096	>	if (transformer == null || reducer == null)
4097	>	throw new NullPointerException();
4098	>	return new MapReduceEntriesToLongTask<K,V>
4099	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4100	>	null, transformer, basis, reducer).invoke();
4101		}
4102
4103		/**
#	Line 3832 | Line 4105 | public class ConcurrentHashMapV8<K, V>
4105		* of all entries using the given reducer to combine values,
4106		* and the given basis as an identity value.
4107		*
4108	+	* @param parallelismThreshold the (estimated) number of elements
4109	+	* needed for this operation to be executed in parallel
4110		* @param transformer a function returning the transformation
4111		* for an element
4112		* @param basis the identity (initial default value) for the reduction
4113		* @param reducer a commutative associative combining function
4114		* @return the result of accumulating the given transformation
4115		* of all entries
4116	+	* @since 1.8
4117		*/
4118	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4118	>	public int reduceEntriesToInt(long parallelismThreshold,
4119	>	ObjectToInt<Map.Entry<K,V>> transformer,
4120		int basis,
4121		IntByIntToInt reducer) {
4122	<	return ForkJoinTasks.reduceEntriesToInt
4123	<	(this, transformer, basis, reducer).invoke();
4122	>	if (transformer == null || reducer == null)
4123	>	throw new NullPointerException();
4124	>	return new MapReduceEntriesToIntTask<K,V>
4125	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4126	>	null, transformer, basis, reducer).invoke();
4127		}
4128
4129	+
4130		/* ----------------Views -------------- */
4131
4132		/**
4133		* Base class for views.
4134		*/
4135	<	static abstract class CHMView<K, V> {
4136	<	final ConcurrentHashMapV8<K, V> map;
4137	<	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
4135	>	abstract static class CollectionView<K,V,E>
4136	>	implements Collection<E>, java.io.Serializable {
4137	>	private static final long serialVersionUID = 7249069246763182397L;
4138	>	final ConcurrentHashMapV8<K,V> map;
4139	>	CollectionView(ConcurrentHashMapV8<K,V> map)  { this.map = map; }
4140
4141		/**
4142		* Returns the map backing this view.
#	Line 3862 | Line 4145 | public class ConcurrentHashMapV8<K, V>
4145		*/
4146		public ConcurrentHashMapV8<K,V> getMap() { return map; }
4147
4148	<	public final int size()                 { return map.size(); }
4149	<	public final boolean isEmpty()          { return map.isEmpty(); }
4150	<	public final void clear()               { map.clear(); }
4148	>	/**
4149	>	* Removes all of the elements from this view, by removing all
4150	>	* the mappings from the map backing this view.
4151	>	*/
4152	>	public final void clear()      { map.clear(); }
4153	>	public final int size()        { return map.size(); }
4154	>	public final boolean isEmpty() { return map.isEmpty(); }
4155
4156		// implementations below rely on concrete classes supplying these
4157	<	abstract public Iterator<?> iterator();
4158	<	abstract public boolean contains(Object o);
4159	<	abstract public boolean remove(Object o);
4157	>	// abstract methods
4158	>	/**
4159	>	* Returns a "weakly consistent" iterator that will never
4160	>	* throw {@link ConcurrentModificationException}, and
4161	>	* guarantees to traverse elements as they existed upon
4162	>	* construction of the iterator, and may (but is not
4163	>	* guaranteed to) reflect any modifications subsequent to
4164	>	* construction.
4165	>	*/
4166	>	public abstract Iterator<E> iterator();
4167	>	public abstract boolean contains(Object o);
4168	>	public abstract boolean remove(Object o);
4169
4170		private static final String oomeMsg = "Required array size too large";
4171
4172		public final Object[] toArray() {
4173		long sz = map.mappingCount();
4174	<	if (sz > (long)(MAX_ARRAY_SIZE))
4174	>	if (sz > MAX_ARRAY_SIZE)
4175		throw new OutOfMemoryError(oomeMsg);
4176		int n = (int)sz;
4177		Object[] r = new Object[n];
4178		int i = 0;
4179	<	Iterator<?> it = iterator();
3884	<	while (it.hasNext()) {
4179	>	for (E e : this) {
4180		if (i == n) {
4181		if (n >= MAX_ARRAY_SIZE)
4182		throw new OutOfMemoryError(oomeMsg);
#	Line 3891 | Line 4186 | public class ConcurrentHashMapV8<K, V>
4186		n += (n >>> 1) + 1;
4187		r = Arrays.copyOf(r, n);
4188		}
4189	<	r[i++] = it.next();
4189	>	r[i++] = e;
4190		}
4191		return (i == n) ? r : Arrays.copyOf(r, i);
4192		}
4193
4194	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4194	>	@SuppressWarnings("unchecked")
4195	>	public final <T> T[] toArray(T[] a) {
4196		long sz = map.mappingCount();
4197	<	if (sz > (long)(MAX_ARRAY_SIZE))
4197	>	if (sz > MAX_ARRAY_SIZE)
4198		throw new OutOfMemoryError(oomeMsg);
4199		int m = (int)sz;
4200		T[] r = (a.length >= m) ? a :
#	Line 3906 | Line 4202 | public class ConcurrentHashMapV8<K, V>
4202		.newInstance(a.getClass().getComponentType(), m);
4203		int n = r.length;
4204		int i = 0;
4205	<	Iterator<?> it = iterator();
3910	<	while (it.hasNext()) {
4205	>	for (E e : this) {
4206		if (i == n) {
4207		if (n >= MAX_ARRAY_SIZE)
4208		throw new OutOfMemoryError(oomeMsg);
#	Line 3917 | Line 4212 | public class ConcurrentHashMapV8<K, V>
4212		n += (n >>> 1) + 1;
4213		r = Arrays.copyOf(r, n);
4214		}
4215	<	r[i++] = (T)it.next();
4215	>	r[i++] = (T)e;
4216		}
4217		if (a == r && i < n) {
4218		r[i] = null; // null-terminate
#	Line 3926 | Line 4221 | public class ConcurrentHashMapV8<K, V>
4221		return (i == n) ? r : Arrays.copyOf(r, i);
4222		}
4223
4224	<	public final int hashCode() {
4225	<	int h = 0;
4226	<	for (Iterator<?> it = iterator(); it.hasNext();)
4227	<	h += it.next().hashCode();
4228	<	return h;
4229	<	}
4230	<
4224	>	/**
4225	>	* Returns a string representation of this collection.
4226	>	* The string representation consists of the string representations
4227	>	* of the collection's elements in the order they are returned by
4228	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4229	>	* Adjacent elements are separated by the characters {@code ", "}
4230	>	* (comma and space).  Elements are converted to strings as by
4231	>	* {@link String#valueOf(Object)}.
4232	>	*
4233	>	* @return a string representation of this collection
4234	>	*/
4235		public final String toString() {
4236		StringBuilder sb = new StringBuilder();
4237		sb.append('[');
4238	<	Iterator<?> it = iterator();
4238	>	Iterator<E> it = iterator();
4239		if (it.hasNext()) {
4240		for (;;) {
4241		Object e = it.next();
#	Line 3951 | Line 4250 | public class ConcurrentHashMapV8<K, V>
4250
4251		public final boolean containsAll(Collection<?> c) {
4252		if (c != this) {
4253	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
3955	<	Object e = it.next();
4253	>	for (Object e : c) {
4254		if (e == null || !contains(e))
4255		return false;
4256		}
#	Line 3962 | Line 4260 | public class ConcurrentHashMapV8<K, V>
4260
4261		public final boolean removeAll(Collection<?> c) {
4262		boolean modified = false;
4263	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4263	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4264		if (c.contains(it.next())) {
4265		it.remove();
4266		modified = true;
#	Line 3973 | Line 4271 | public class ConcurrentHashMapV8<K, V>
4271
4272		public final boolean retainAll(Collection<?> c) {
4273		boolean modified = false;
4274	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4274	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4275		if (!c.contains(it.next())) {
4276		it.remove();
4277		modified = true;
#	Line 3987 | Line 4285 | public class ConcurrentHashMapV8<K, V>
4285		/**
4286		* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4287		* which additions may optionally be enabled by mapping to a
4288	<	* common value.  This class cannot be directly instantiated. See
4289	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4290	<	* {@link #newKeySet(int)}.
4288	>	* common value.  This class cannot be directly instantiated.
4289	>	* See {@link #keySet() keySet()},
4290	>	* {@link #keySet(Object) keySet(V)},
4291	>	* {@link #newKeySet() newKeySet()},
4292	>	* {@link #newKeySet(int) newKeySet(int)}.
4293	>	*
4294	>	* @since 1.8
4295		*/
4296	<	public static class KeySetView<K,V> extends CHMView<K,V>
4296	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4297		implements Set<K>, java.io.Serializable {
4298		private static final long serialVersionUID = 7249069246763182397L;
4299		private final V value;
4300	<	KeySetView(ConcurrentHashMapV8<K, V> map, V value) {  // non-public
4300	>	KeySetView(ConcurrentHashMapV8<K,V> map, V value) {  // non-public
4301		super(map);
4302		this.value = value;
4303		}
#	Line 4005 | Line 4307 | public class ConcurrentHashMapV8<K, V>
4307		* or {@code null} if additions are not supported.
4308		*
4309		* @return the default mapped value for additions, or {@code null}
4310	<	* if not supported.
4310	>	* if not supported
4311		*/
4312		public V getMappedValue() { return value; }
4313
4314	<	// implement Set API
4315	<
4314	>	/**
4315	>	* {@inheritDoc}
4316	>	* @throws NullPointerException if the specified key is null
4317	>	*/
4318		public boolean contains(Object o) { return map.containsKey(o); }
4015	–	public boolean remove(Object o)   { return map.remove(o) != null; }
4319
4320		/**
4321	<	* Returns a "weakly consistent" iterator that will never
4322	<	* throw {@link ConcurrentModificationException}, and
4323	<	* guarantees to traverse elements as they existed upon
4021	<	* construction of the iterator, and may (but is not
4022	<	* guaranteed to) reflect any modifications subsequent to
4023	<	* construction.
4321	>	* Removes the key from this map view, by removing the key (and its
4322	>	* corresponding value) from the backing map.  This method does
4323	>	* nothing if the key is not in the map.
4324		*
4325	<	* @return an iterator over the keys of this map
4325	>	* @param  o the key to be removed from the backing map
4326	>	* @return {@code true} if the backing map contained the specified key
4327	>	* @throws NullPointerException if the specified key is null
4328	>	*/
4329	>	public boolean remove(Object o) { return map.remove(o) != null; }
4330	>
4331	>	/**
4332	>	* @return an iterator over the keys of the backing map
4333	>	*/
4334	>	public Iterator<K> iterator() {
4335	>	Node<K,V>[] t;
4336	>	ConcurrentHashMapV8<K,V> m = map;
4337	>	int f = (t = m.table) == null ? 0 : t.length;
4338	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4339	>	}
4340	>
4341	>	/**
4342	>	* Adds the specified key to this set view by mapping the key to
4343	>	* the default mapped value in the backing map, if defined.
4344	>	*
4345	>	* @param e key to be added
4346	>	* @return {@code true} if this set changed as a result of the call
4347	>	* @throws NullPointerException if the specified key is null
4348	>	* @throws UnsupportedOperationException if no default mapped value
4349	>	* for additions was provided
4350		*/
4027	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4351		public boolean add(K e) {
4352		V v;
4353		if ((v = value) == null)
4354		throw new UnsupportedOperationException();
4355	<	if (e == null)
4033	<	throw new NullPointerException();
4034	<	return map.internalPut(e, v, true) == null;
4355	>	return map.putVal(e, v, true) == null;
4356		}
4357	+
4358	+	/**
4359	+	* Adds all of the elements in the specified collection to this set,
4360	+	* as if by calling {@link #add} on each one.
4361	+	*
4362	+	* @param c the elements to be inserted into this set
4363	+	* @return {@code true} if this set changed as a result of the call
4364	+	* @throws NullPointerException if the collection or any of its
4365	+	* elements are {@code null}
4366	+	* @throws UnsupportedOperationException if no default mapped value
4367	+	* for additions was provided
4368	+	*/
4369		public boolean addAll(Collection<? extends K> c) {
4370		boolean added = false;
4371		V v;
4372		if ((v = value) == null)
4373		throw new UnsupportedOperationException();
4374		for (K e : c) {
4375	<	if (e == null)
4043	<	throw new NullPointerException();
4044	<	if (map.internalPut(e, v, true) == null)
4375	>	if (map.putVal(e, v, true) == null)
4376		added = true;
4377		}
4378		return added;
4379		}
4380	+
4381	+	public int hashCode() {
4382	+	int h = 0;
4383	+	for (K e : this)
4384	+	h += e.hashCode();
4385	+	return h;
4386	+	}
4387	+
4388		public boolean equals(Object o) {
4389		Set<?> c;
4390		return ((o instanceof Set) &&
#	Line 4053 | Line 4392 | public class ConcurrentHashMapV8<K, V>
4392		(containsAll(c) && c.containsAll(this))));
4393		}
4394
4395	<	/**
4396	<	* Performs the given action for each key.
4397	<	*
4398	<	* @param action the action
4399	<	*/
4400	<	public void forEach(Action<K> action) {
4062	<	ForkJoinTasks.forEachKey
4063	<	(map, action).invoke();
4064	<	}
4065	<
4066	<	/**
4067	<	* Performs the given action for each non-null transformation
4068	<	* of each key.
4069	<	*
4070	<	* @param transformer a function returning the transformation
4071	<	* for an element, or null of there is no transformation (in
4072	<	* which case the action is not applied).
4073	<	* @param action the action
4074	<	*/
4075	<	public <U> void forEach(Fun<? super K, ? extends U> transformer,
4076	<	Action<U> action) {
4077	<	ForkJoinTasks.forEachKey
4078	<	(map, transformer, action).invoke();
4079	<	}
4080	<
4081	<	/**
4082	<	* Returns a non-null result from applying the given search
4083	<	* function on each key, or null if none. Upon success,
4084	<	* further element processing is suppressed and the results of
4085	<	* any other parallel invocations of the search function are
4086	<	* ignored.
4087	<	*
4088	<	* @param searchFunction a function returning a non-null
4089	<	* result on success, else null
4090	<	* @return a non-null result from applying the given search
4091	<	* function on each key, or null if none
4092	<	*/
4093	<	public <U> U search(Fun<? super K, ? extends U> searchFunction) {
4094	<	return ForkJoinTasks.searchKeys
4095	<	(map, searchFunction).invoke();
4096	<	}
4097	<
4098	<	/**
4099	<	* Returns the result of accumulating all keys using the given
4100	<	* reducer to combine values, or null if none.
4101	<	*
4102	<	* @param reducer a commutative associative combining function
4103	<	* @return the result of accumulating all keys using the given
4104	<	* reducer to combine values, or null if none
4105	<	*/
4106	<	public K reduce(BiFun<? super K, ? super K, ? extends K> reducer) {
4107	<	return ForkJoinTasks.reduceKeys
4108	<	(map, reducer).invoke();
4395	>	public ConcurrentHashMapSpliterator<K> spliterator() {
4396	>	Node<K,V>[] t;
4397	>	ConcurrentHashMapV8<K,V> m = map;
4398	>	long n = m.sumCount();
4399	>	int f = (t = m.table) == null ? 0 : t.length;
4400	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4401		}
4402
4403	<	/**
4404	<	* Returns the result of accumulating the given transformation
4405	<	* of all keys using the given reducer to combine values, and
4406	<	* the given basis as an identity value.
4407	<	*
4408	<	* @param transformer a function returning the transformation
4409	<	* for an element
4410	<	* @param basis the identity (initial default value) for the reduction
4119	<	* @param reducer a commutative associative combining function
4120	<	* @return  the result of accumulating the given transformation
4121	<	* of all keys
4122	<	*/
4123	<	public double reduceToDouble(ObjectToDouble<? super K> transformer,
4124	<	double basis,
4125	<	DoubleByDoubleToDouble reducer) {
4126	<	return ForkJoinTasks.reduceKeysToDouble
4127	<	(map, transformer, basis, reducer).invoke();
4128	<	}
4129	<
4130	<	/**
4131	<	* Returns the result of accumulating the given transformation
4132	<	* of all keys using the given reducer to combine values, and
4133	<	* the given basis as an identity value.
4134	<	*
4135	<	* @param transformer a function returning the transformation
4136	<	* for an element
4137	<	* @param basis the identity (initial default value) for the reduction
4138	<	* @param reducer a commutative associative combining function
4139	<	* @return the result of accumulating the given transformation
4140	<	* of all keys
4141	<	*/
4142	<	public long reduceToLong(ObjectToLong<? super K> transformer,
4143	<	long basis,
4144	<	LongByLongToLong reducer) {
4145	<	return ForkJoinTasks.reduceKeysToLong
4146	<	(map, transformer, basis, reducer).invoke();
4147	<	}
4148	<
4149	<	/**
4150	<	* Returns the result of accumulating the given transformation
4151	<	* of all keys using the given reducer to combine values, and
4152	<	* the given basis as an identity value.
4153	<	*
4154	<	* @param transformer a function returning the transformation
4155	<	* for an element
4156	<	* @param basis the identity (initial default value) for the reduction
4157	<	* @param reducer a commutative associative combining function
4158	<	* @return the result of accumulating the given transformation
4159	<	* of all keys
4160	<	*/
4161	<	public int reduceToInt(ObjectToInt<? super K> transformer,
4162	<	int basis,
4163	<	IntByIntToInt reducer) {
4164	<	return ForkJoinTasks.reduceKeysToInt
4165	<	(map, transformer, basis, reducer).invoke();
4403	>	public void forEach(Action<? super K> action) {
4404	>	if (action == null) throw new NullPointerException();
4405	>	Node<K,V>[] t;
4406	>	if ((t = map.table) != null) {
4407	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4408	>	for (Node<K,V> p; (p = it.advance()) != null; )
4409	>	action.apply(p.key);
4410	>	}
4411		}
4167	–
4412		}
4413
4414		/**
4415		* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4416		* values, in which additions are disabled. This class cannot be
4417	<	* directly instantiated. See {@link #values},
4174	<	*
4175	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4176	<	* that will never throw {@link ConcurrentModificationException},
4177	<	* and guarantees to traverse elements as they existed upon
4178	<	* construction of the iterator, and may (but is not guaranteed to)
4179	<	* reflect any modifications subsequent to construction.
4417	>	* directly instantiated. See {@link #values()}.
4418		*/
4419	<	public static final class ValuesView<K,V> extends CHMView<K,V>
4420	<	implements Collection<V> {
4421	<	ValuesView(ConcurrentHashMapV8<K, V> map)   { super(map); }
4422	<	public final boolean contains(Object o) { return map.containsValue(o); }
4419	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4420	>	implements Collection<V>, java.io.Serializable {
4421	>	private static final long serialVersionUID = 2249069246763182397L;
4422	>	ValuesView(ConcurrentHashMapV8<K,V> map) { super(map); }
4423	>	public final boolean contains(Object o) {
4424	>	return map.containsValue(o);
4425	>	}
4426	>
4427		public final boolean remove(Object o) {
4428		if (o != null) {
4429	<	Iterator<V> it = new ValueIterator<K,V>(map);
4188	<	while (it.hasNext()) {
4429	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4430		if (o.equals(it.next())) {
4431		it.remove();
4432		return true;
#	Line 4195 | Line 4436 | public class ConcurrentHashMapV8<K, V>
4436		return false;
4437		}
4438
4198	–	/**
4199	–	* Returns a "weakly consistent" iterator that will never
4200	–	* throw {@link ConcurrentModificationException}, and
4201	–	* guarantees to traverse elements as they existed upon
4202	–	* construction of the iterator, and may (but is not
4203	–	* guaranteed to) reflect any modifications subsequent to
4204	–	* construction.
4205	–	*
4206	–	* @return an iterator over the values of this map
4207	–	*/
4439		public final Iterator<V> iterator() {
4440	<	return new ValueIterator<K,V>(map);
4440	>	ConcurrentHashMapV8<K,V> m = map;
4441	>	Node<K,V>[] t;
4442	>	int f = (t = m.table) == null ? 0 : t.length;
4443	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4444		}
4445	+
4446		public final boolean add(V e) {
4447		throw new UnsupportedOperationException();
4448		}
#	Line 4215 | Line 4450 | public class ConcurrentHashMapV8<K, V>
4450		throw new UnsupportedOperationException();
4451		}
4452
4453	<	/**
4454	<	* Performs the given action for each value.
4455	<	*
4456	<	* @param action the action
4457	<	*/
4458	<	public void forEach(Action<V> action) {
4224	<	ForkJoinTasks.forEachValue
4225	<	(map, action).invoke();
4226	<	}
4227	<
4228	<	/**
4229	<	* Performs the given action for each non-null transformation
4230	<	* of each value.
4231	<	*
4232	<	* @param transformer a function returning the transformation
4233	<	* for an element, or null of there is no transformation (in
4234	<	* which case the action is not applied).
4235	<	*/
4236	<	public <U> void forEach(Fun<? super V, ? extends U> transformer,
4237	<	Action<U> action) {
4238	<	ForkJoinTasks.forEachValue
4239	<	(map, transformer, action).invoke();
4240	<	}
4241	<
4242	<	/**
4243	<	* Returns a non-null result from applying the given search
4244	<	* function on each value, or null if none.  Upon success,
4245	<	* further element processing is suppressed and the results of
4246	<	* any other parallel invocations of the search function are
4247	<	* ignored.
4248	<	*
4249	<	* @param searchFunction a function returning a non-null
4250	<	* result on success, else null
4251	<	* @return a non-null result from applying the given search
4252	<	* function on each value, or null if none
4253	<	*
4254	<	*/
4255	<	public <U> U search(Fun<? super V, ? extends U> searchFunction) {
4256	<	return ForkJoinTasks.searchValues
4257	<	(map, searchFunction).invoke();
4258	<	}
4259	<
4260	<	/**
4261	<	* Returns the result of accumulating all values using the
4262	<	* given reducer to combine values, or null if none.
4263	<	*
4264	<	* @param reducer a commutative associative combining function
4265	<	* @return  the result of accumulating all values
4266	<	*/
4267	<	public V reduce(BiFun<? super V, ? super V, ? extends V> reducer) {
4268	<	return ForkJoinTasks.reduceValues
4269	<	(map, reducer).invoke();
4453	>	public ConcurrentHashMapSpliterator<V> spliterator() {
4454	>	Node<K,V>[] t;
4455	>	ConcurrentHashMapV8<K,V> m = map;
4456	>	long n = m.sumCount();
4457	>	int f = (t = m.table) == null ? 0 : t.length;
4458	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4459		}
4460
4461	<	/**
4462	<	* Returns the result of accumulating the given transformation
4463	<	* of all values using the given reducer to combine values, or
4464	<	* null if none.
4465	<	*
4466	<	* @param transformer a function returning the transformation
4467	<	* for an element, or null of there is no transformation (in
4468	<	* which case it is not combined).
4280	<	* @param reducer a commutative associative combining function
4281	<	* @return the result of accumulating the given transformation
4282	<	* of all values
4283	<	*/
4284	<	public <U> U reduce(Fun<? super V, ? extends U> transformer,
4285	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4286	<	return ForkJoinTasks.reduceValues
4287	<	(map, transformer, reducer).invoke();
4288	<	}
4289	<
4290	<	/**
4291	<	* Returns the result of accumulating the given transformation
4292	<	* of all values using the given reducer to combine values,
4293	<	* and the given basis as an identity value.
4294	<	*
4295	<	* @param transformer a function returning the transformation
4296	<	* for an element
4297	<	* @param basis the identity (initial default value) for the reduction
4298	<	* @param reducer a commutative associative combining function
4299	<	* @return the result of accumulating the given transformation
4300	<	* of all values
4301	<	*/
4302	<	public double reduceToDouble(ObjectToDouble<? super V> transformer,
4303	<	double basis,
4304	<	DoubleByDoubleToDouble reducer) {
4305	<	return ForkJoinTasks.reduceValuesToDouble
4306	<	(map, transformer, basis, reducer).invoke();
4307	<	}
4308	<
4309	<	/**
4310	<	* Returns the result of accumulating the given transformation
4311	<	* of all values using the given reducer to combine values,
4312	<	* and the given basis as an identity value.
4313	<	*
4314	<	* @param transformer a function returning the transformation
4315	<	* for an element
4316	<	* @param basis the identity (initial default value) for the reduction
4317	<	* @param reducer a commutative associative combining function
4318	<	* @return the result of accumulating the given transformation
4319	<	* of all values
4320	<	*/
4321	<	public long reduceToLong(ObjectToLong<? super V> transformer,
4322	<	long basis,
4323	<	LongByLongToLong reducer) {
4324	<	return ForkJoinTasks.reduceValuesToLong
4325	<	(map, transformer, basis, reducer).invoke();
4326	<	}
4327	<
4328	<	/**
4329	<	* Returns the result of accumulating the given transformation
4330	<	* of all values using the given reducer to combine values,
4331	<	* and the given basis as an identity value.
4332	<	*
4333	<	* @param transformer a function returning the transformation
4334	<	* for an element
4335	<	* @param basis the identity (initial default value) for the reduction
4336	<	* @param reducer a commutative associative combining function
4337	<	* @return the result of accumulating the given transformation
4338	<	* of all values
4339	<	*/
4340	<	public int reduceToInt(ObjectToInt<? super V> transformer,
4341	<	int basis,
4342	<	IntByIntToInt reducer) {
4343	<	return ForkJoinTasks.reduceValuesToInt
4344	<	(map, transformer, basis, reducer).invoke();
4461	>	public void forEach(Action<? super V> action) {
4462	>	if (action == null) throw new NullPointerException();
4463	>	Node<K,V>[] t;
4464	>	if ((t = map.table) != null) {
4465	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4466	>	for (Node<K,V> p; (p = it.advance()) != null; )
4467	>	action.apply(p.val);
4468	>	}
4469		}
4346	–
4470		}
4471
4472		/**
4473		* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4474		* entries.  This class cannot be directly instantiated. See
4475	<	* {@link #entrySet}.
4475	>	* {@link #entrySet()}.
4476		*/
4477	<	public static final class EntrySetView<K,V> extends CHMView<K,V>
4478	<	implements Set<Map.Entry<K,V>> {
4479	<	EntrySetView(ConcurrentHashMapV8<K, V> map) { super(map); }
4480	<	public final boolean contains(Object o) {
4477	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4478	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4479	>	private static final long serialVersionUID = 2249069246763182397L;
4480	>	EntrySetView(ConcurrentHashMapV8<K,V> map) { super(map); }
4481	>
4482	>	public boolean contains(Object o) {
4483		Object k, v, r; Map.Entry<?,?> e;
4484		return ((o instanceof Map.Entry) &&
4485		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4362 | Line 4487 | public class ConcurrentHashMapV8<K, V>
4487		(v = e.getValue()) != null &&
4488		(v == r || v.equals(r)));
4489		}
4490	<	public final boolean remove(Object o) {
4490	>
4491	>	public boolean remove(Object o) {
4492		Object k, v; Map.Entry<?,?> e;
4493		return ((o instanceof Map.Entry) &&
4494		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4371 | Line 4497 | public class ConcurrentHashMapV8<K, V>
4497		}
4498
4499		/**
4500	<	* Returns a "weakly consistent" iterator that will never
4375	<	* throw {@link ConcurrentModificationException}, and
4376	<	* guarantees to traverse elements as they existed upon
4377	<	* construction of the iterator, and may (but is not
4378	<	* guaranteed to) reflect any modifications subsequent to
4379	<	* construction.
4380	<	*
4381	<	* @return an iterator over the entries of this map
4500	>	* @return an iterator over the entries of the backing map
4501		*/
4502	<	public final Iterator<Map.Entry<K,V>> iterator() {
4503	<	return new EntryIterator<K,V>(map);
4502	>	public Iterator<Map.Entry<K,V>> iterator() {
4503	>	ConcurrentHashMapV8<K,V> m = map;
4504	>	Node<K,V>[] t;
4505	>	int f = (t = m.table) == null ? 0 : t.length;
4506	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4507		}
4508
4509	<	public final boolean add(Entry<K,V> e) {
4510	<	K key = e.getKey();
4389	<	V value = e.getValue();
4390	<	if (key == null || value == null)
4391	<	throw new NullPointerException();
4392	<	return map.internalPut(key, value, false) == null;
4509	>	public boolean add(Entry<K,V> e) {
4510	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4511		}
4512	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4512	>
4513	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4514		boolean added = false;
4515		for (Entry<K,V> e : c) {
4516		if (add(e))
#	Line 4399 | Line 4518 | public class ConcurrentHashMapV8<K, V>
4518		}
4519		return added;
4520		}
4521	<	public boolean equals(Object o) {
4521	>
4522	>	public final int hashCode() {
4523	>	int h = 0;
4524	>	Node<K,V>[] t;
4525	>	if ((t = map.table) != null) {
4526	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4527	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4528	>	h += p.hashCode();
4529	>	}
4530	>	}
4531	>	return h;
4532	>	}
4533	>
4534	>	public final boolean equals(Object o) {
4535		Set<?> c;
4536		return ((o instanceof Set) &&
4537		((c = (Set<?>)o) == this ||
4538		(containsAll(c) && c.containsAll(this))));
4539		}
4540
4541	<	/**
4542	<	* Performs the given action for each entry.
4543	<	*
4544	<	* @param action the action
4545	<	*/
4546	<	public void forEach(Action<Map.Entry<K,V>> action) {
4415	<	ForkJoinTasks.forEachEntry
4416	<	(map, action).invoke();
4417	<	}
4418	<
4419	<	/**
4420	<	* Performs the given action for each non-null transformation
4421	<	* of each entry.
4422	<	*
4423	<	* @param transformer a function returning the transformation
4424	<	* for an element, or null of there is no transformation (in
4425	<	* which case the action is not applied).
4426	<	* @param action the action
4427	<	*/
4428	<	public <U> void forEach(Fun<Map.Entry<K,V>, ? extends U> transformer,
4429	<	Action<U> action) {
4430	<	ForkJoinTasks.forEachEntry
4431	<	(map, transformer, action).invoke();
4432	<	}
4433	<
4434	<	/**
4435	<	* Returns a non-null result from applying the given search
4436	<	* function on each entry, or null if none.  Upon success,
4437	<	* further element processing is suppressed and the results of
4438	<	* any other parallel invocations of the search function are
4439	<	* ignored.
4440	<	*
4441	<	* @param searchFunction a function returning a non-null
4442	<	* result on success, else null
4443	<	* @return a non-null result from applying the given search
4444	<	* function on each entry, or null if none
4445	<	*/
4446	<	public <U> U search(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4447	<	return ForkJoinTasks.searchEntries
4448	<	(map, searchFunction).invoke();
4541	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> spliterator() {
4542	>	Node<K,V>[] t;
4543	>	ConcurrentHashMapV8<K,V> m = map;
4544	>	long n = m.sumCount();
4545	>	int f = (t = m.table) == null ? 0 : t.length;
4546	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4547		}
4548
4549	<	/**
4550	<	* Returns the result of accumulating all entries using the
4551	<	* given reducer to combine values, or null if none.
4552	<	*
4553	<	* @param reducer a commutative associative combining function
4554	<	* @return the result of accumulating all entries
4555	<	*/
4556	<	public Map.Entry<K,V> reduce(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4459	<	return ForkJoinTasks.reduceEntries
4460	<	(map, reducer).invoke();
4461	<	}
4462	<
4463	<	/**
4464	<	* Returns the result of accumulating the given transformation
4465	<	* of all entries using the given reducer to combine values,
4466	<	* or null if none.
4467	<	*
4468	<	* @param transformer a function returning the transformation
4469	<	* for an element, or null of there is no transformation (in
4470	<	* which case it is not combined).
4471	<	* @param reducer a commutative associative combining function
4472	<	* @return the result of accumulating the given transformation
4473	<	* of all entries
4474	<	*/
4475	<	public <U> U reduce(Fun<Map.Entry<K,V>, ? extends U> transformer,
4476	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4477	<	return ForkJoinTasks.reduceEntries
4478	<	(map, transformer, reducer).invoke();
4479	<	}
4480	<
4481	<	/**
4482	<	* Returns the result of accumulating the given transformation
4483	<	* of all entries using the given reducer to combine values,
4484	<	* and the given basis as an identity value.
4485	<	*
4486	<	* @param transformer a function returning the transformation
4487	<	* for an element
4488	<	* @param basis the identity (initial default value) for the reduction
4489	<	* @param reducer a commutative associative combining function
4490	<	* @return the result of accumulating the given transformation
4491	<	* of all entries
4492	<	*/
4493	<	public double reduceToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4494	<	double basis,
4495	<	DoubleByDoubleToDouble reducer) {
4496	<	return ForkJoinTasks.reduceEntriesToDouble
4497	<	(map, transformer, basis, reducer).invoke();
4498	<	}
4499	<
4500	<	/**
4501	<	* Returns the result of accumulating the given transformation
4502	<	* of all entries using the given reducer to combine values,
4503	<	* and the given basis as an identity value.
4504	<	*
4505	<	* @param transformer a function returning the transformation
4506	<	* for an element
4507	<	* @param basis the identity (initial default value) for the reduction
4508	<	* @param reducer a commutative associative combining function
4509	<	* @return  the result of accumulating the given transformation
4510	<	* of all entries
4511	<	*/
4512	<	public long reduceToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4513	<	long basis,
4514	<	LongByLongToLong reducer) {
4515	<	return ForkJoinTasks.reduceEntriesToLong
4516	<	(map, transformer, basis, reducer).invoke();
4517	<	}
4518	<
4519	<	/**
4520	<	* Returns the result of accumulating the given transformation
4521	<	* of all entries using the given reducer to combine values,
4522	<	* and the given basis as an identity value.
4523	<	*
4524	<	* @param transformer a function returning the transformation
4525	<	* for an element
4526	<	* @param basis the identity (initial default value) for the reduction
4527	<	* @param reducer a commutative associative combining function
4528	<	* @return the result of accumulating the given transformation
4529	<	* of all entries
4530	<	*/
4531	<	public int reduceToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4532	<	int basis,
4533	<	IntByIntToInt reducer) {
4534	<	return ForkJoinTasks.reduceEntriesToInt
4535	<	(map, transformer, basis, reducer).invoke();
4549	>	public void forEach(Action<? super Map.Entry<K,V>> action) {
4550	>	if (action == null) throw new NullPointerException();
4551	>	Node<K,V>[] t;
4552	>	if ((t = map.table) != null) {
4553	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4554	>	for (Node<K,V> p; (p = it.advance()) != null; )
4555	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
4556	>	}
4557		}
4558
4559		}
4560
4561	<	// ---------------------------------------------------------------------
4561	>	// -------------------------------------------------------
4562
4563		/**
4564	<	* Predefined tasks for performing bulk parallel operations on
4565	<	* ConcurrentHashMapV8s. These tasks follow the forms and rules used
4545	<	* for bulk operations. Each method has the same name, but returns
4546	<	* a task rather than invoking it. These methods may be useful in
4547	<	* custom applications such as submitting a task without waiting
4548	<	* for completion, using a custom pool, or combining with other
4549	<	* tasks.
4564	>	* Base class for bulk tasks. Repeats some fields and code from
4565	>	* class Traverser, because we need to subclass CountedCompleter.
4566		*/
4567	<	public static class ForkJoinTasks {
4568	<	private ForkJoinTasks() {}
4569	<
4570	<	/**
4571	<	* Returns a task that when invoked, performs the given
4572	<	* action for each (key, value)
4573	<	*
4574	<	* @param map the map
4575	<	* @param action the action
4576	<	* @return the task
4577	<	*/
4578	<	public static <K,V> ForkJoinTask<Void> forEach
4579	<	(ConcurrentHashMapV8<K,V> map,
4580	<	BiAction<K,V> action) {
4581	<	if (action == null) throw new NullPointerException();
4582	<	return new ForEachMappingTask<K,V>(map, null, -1, action);
4583	<	}
4584	<
4585	<	/**
4586	<	* Returns a task that when invoked, performs the given
4587	<	* action for each non-null transformation of each (key, value)
4572	<	*
4573	<	* @param map the map
4574	<	* @param transformer a function returning the transformation
4575	<	* for an element, or null if there is no transformation (in
4576	<	* which case the action is not applied)
4577	<	* @param action the action
4578	<	* @return the task
4579	<	*/
4580	<	public static <K,V,U> ForkJoinTask<Void> forEach
4581	<	(ConcurrentHashMapV8<K,V> map,
4582	<	BiFun<? super K, ? super V, ? extends U> transformer,
4583	<	Action<U> action) {
4584	<	if (transformer == null || action == null)
4585	<	throw new NullPointerException();
4586	<	return new ForEachTransformedMappingTask<K,V,U>
4587	<	(map, null, -1, transformer, action);
4588	<	}
4589	<
4590	<	/**
4591	<	* Returns a task that when invoked, returns a non-null result
4592	<	* from applying the given search function on each (key,
4593	<	* value), or null if none. Upon success, further element
4594	<	* processing is suppressed and the results of any other
4595	<	* parallel invocations of the search function are ignored.
4596	<	*
4597	<	* @param map the map
4598	<	* @param searchFunction a function returning a non-null
4599	<	* result on success, else null
4600	<	* @return the task
4601	<	*/
4602	<	public static <K,V,U> ForkJoinTask<U> search
4603	<	(ConcurrentHashMapV8<K,V> map,
4604	<	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4605	<	if (searchFunction == null) throw new NullPointerException();
4606	<	return new SearchMappingsTask<K,V,U>
4607	<	(map, null, -1, searchFunction,
4608	<	new AtomicReference<U>());
4609	<	}
4610	<
4611	<	/**
4612	<	* Returns a task that when invoked, returns the result of
4613	<	* accumulating the given transformation of all (key, value) pairs
4614	<	* using the given reducer to combine values, or null if none.
4615	<	*
4616	<	* @param map the map
4617	<	* @param transformer a function returning the transformation
4618	<	* for an element, or null if there is no transformation (in
4619	<	* which case it is not combined).
4620	<	* @param reducer a commutative associative combining function
4621	<	* @return the task
4622	<	*/
4623	<	public static <K,V,U> ForkJoinTask<U> reduce
4624	<	(ConcurrentHashMapV8<K,V> map,
4625	<	BiFun<? super K, ? super V, ? extends U> transformer,
4626	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4627	<	if (transformer == null || reducer == null)
4628	<	throw new NullPointerException();
4629	<	return new MapReduceMappingsTask<K,V,U>
4630	<	(map, null, -1, null, transformer, reducer);
4631	<	}
4632	<
4633	<	/**
4634	<	* Returns a task that when invoked, returns the result of
4635	<	* accumulating the given transformation of all (key, value) pairs
4636	<	* using the given reducer to combine values, and the given
4637	<	* basis as an identity value.
4638	<	*
4639	<	* @param map the map
4640	<	* @param transformer a function returning the transformation
4641	<	* for an element
4642	<	* @param basis the identity (initial default value) for the reduction
4643	<	* @param reducer a commutative associative combining function
4644	<	* @return the task
4645	<	*/
4646	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4647	<	(ConcurrentHashMapV8<K,V> map,
4648	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
4649	<	double basis,
4650	<	DoubleByDoubleToDouble reducer) {
4651	<	if (transformer == null || reducer == null)
4652	<	throw new NullPointerException();
4653	<	return new MapReduceMappingsToDoubleTask<K,V>
4654	<	(map, null, -1, null, transformer, basis, reducer);
4655	<	}
4656	<
4657	<	/**
4658	<	* Returns a task that when invoked, returns the result of
4659	<	* accumulating the given transformation of all (key, value) pairs
4660	<	* using the given reducer to combine values, and the given
4661	<	* basis as an identity value.
4662	<	*
4663	<	* @param map the map
4664	<	* @param transformer a function returning the transformation
4665	<	* for an element
4666	<	* @param basis the identity (initial default value) for the reduction
4667	<	* @param reducer a commutative associative combining function
4668	<	* @return the task
4669	<	*/
4670	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4671	<	(ConcurrentHashMapV8<K,V> map,
4672	<	ObjectByObjectToLong<? super K, ? super V> transformer,
4673	<	long basis,
4674	<	LongByLongToLong reducer) {
4675	<	if (transformer == null || reducer == null)
4676	<	throw new NullPointerException();
4677	<	return new MapReduceMappingsToLongTask<K,V>
4678	<	(map, null, -1, null, transformer, basis, reducer);
4679	<	}
4680	<
4681	<	/**
4682	<	* Returns a task that when invoked, returns the result of
4683	<	* accumulating the given transformation of all (key, value) pairs
4684	<	* using the given reducer to combine values, and the given
4685	<	* basis as an identity value.
4686	<	*
4687	<	* @param transformer a function returning the transformation
4688	<	* for an element
4689	<	* @param basis the identity (initial default value) for the reduction
4690	<	* @param reducer a commutative associative combining function
4691	<	* @return the task
4692	<	*/
4693	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4694	<	(ConcurrentHashMapV8<K,V> map,
4695	<	ObjectByObjectToInt<? super K, ? super V> transformer,
4696	<	int basis,
4697	<	IntByIntToInt reducer) {
4698	<	if (transformer == null || reducer == null)
4699	<	throw new NullPointerException();
4700	<	return new MapReduceMappingsToIntTask<K,V>
4701	<	(map, null, -1, null, transformer, basis, reducer);
4702	<	}
4703	<
4704	<	/**
4705	<	* Returns a task that when invoked, performs the given action
4706	<	* for each key.
4707	<	*
4708	<	* @param map the map
4709	<	* @param action the action
4710	<	* @return the task
4711	<	*/
4712	<	public static <K,V> ForkJoinTask<Void> forEachKey
4713	<	(ConcurrentHashMapV8<K,V> map,
4714	<	Action<K> action) {
4715	<	if (action == null) throw new NullPointerException();
4716	<	return new ForEachKeyTask<K,V>(map, null, -1, action);
4717	<	}
4718	<
4719	<	/**
4720	<	* Returns a task that when invoked, performs the given action
4721	<	* for each non-null transformation of each key.
4722	<	*
4723	<	* @param map the map
4724	<	* @param transformer a function returning the transformation
4725	<	* for an element, or null if there is no transformation (in
4726	<	* which case the action is not applied)
4727	<	* @param action the action
4728	<	* @return the task
4729	<	*/
4730	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4731	<	(ConcurrentHashMapV8<K,V> map,
4732	<	Fun<? super K, ? extends U> transformer,
4733	<	Action<U> action) {
4734	<	if (transformer == null || action == null)
4735	<	throw new NullPointerException();
4736	<	return new ForEachTransformedKeyTask<K,V,U>
4737	<	(map, null, -1, transformer, action);
4738	<	}
4739	<
4740	<	/**
4741	<	* Returns a task that when invoked, returns a non-null result
4742	<	* from applying the given search function on each key, or
4743	<	* null if none.  Upon success, further element processing is
4744	<	* suppressed and the results of any other parallel
4745	<	* invocations of the search function are ignored.
4746	<	*
4747	<	* @param map the map
4748	<	* @param searchFunction a function returning a non-null
4749	<	* result on success, else null
4750	<	* @return the task
4751	<	*/
4752	<	public static <K,V,U> ForkJoinTask<U> searchKeys
4753	<	(ConcurrentHashMapV8<K,V> map,
4754	<	Fun<? super K, ? extends U> searchFunction) {
4755	<	if (searchFunction == null) throw new NullPointerException();
4756	<	return new SearchKeysTask<K,V,U>
4757	<	(map, null, -1, searchFunction,
4758	<	new AtomicReference<U>());
4759	<	}
4760	<
4761	<	/**
4762	<	* Returns a task that when invoked, returns the result of
4763	<	* accumulating all keys using the given reducer to combine
4764	<	* values, or null if none.
4765	<	*
4766	<	* @param map the map
4767	<	* @param reducer a commutative associative combining function
4768	<	* @return the task
4769	<	*/
4770	<	public static <K,V> ForkJoinTask<K> reduceKeys
4771	<	(ConcurrentHashMapV8<K,V> map,
4772	<	BiFun<? super K, ? super K, ? extends K> reducer) {
4773	<	if (reducer == null) throw new NullPointerException();
4774	<	return new ReduceKeysTask<K,V>
4775	<	(map, null, -1, null, reducer);
4776	<	}
4777	<
4778	<	/**
4779	<	* Returns a task that when invoked, returns the result of
4780	<	* accumulating the given transformation of all keys using the given
4781	<	* reducer to combine values, or null if none.
4782	<	*
4783	<	* @param map the map
4784	<	* @param transformer a function returning the transformation
4785	<	* for an element, or null if there is no transformation (in
4786	<	* which case it is not combined).
4787	<	* @param reducer a commutative associative combining function
4788	<	* @return the task
4789	<	*/
4790	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
4791	<	(ConcurrentHashMapV8<K,V> map,
4792	<	Fun<? super K, ? extends U> transformer,
4793	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4794	<	if (transformer == null || reducer == null)
4795	<	throw new NullPointerException();
4796	<	return new MapReduceKeysTask<K,V,U>
4797	<	(map, null, -1, null, transformer, reducer);
4798	<	}
4799	<
4800	<	/**
4801	<	* Returns a task that when invoked, returns the result of
4802	<	* accumulating the given transformation of all keys using the given
4803	<	* reducer to combine values, and the given basis as an
4804	<	* identity value.
4805	<	*
4806	<	* @param map the map
4807	<	* @param transformer a function returning the transformation
4808	<	* for an element
4809	<	* @param basis the identity (initial default value) for the reduction
4810	<	* @param reducer a commutative associative combining function
4811	<	* @return the task
4812	<	*/
4813	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4814	<	(ConcurrentHashMapV8<K,V> map,
4815	<	ObjectToDouble<? super K> transformer,
4816	<	double basis,
4817	<	DoubleByDoubleToDouble reducer) {
4818	<	if (transformer == null || reducer == null)
4819	<	throw new NullPointerException();
4820	<	return new MapReduceKeysToDoubleTask<K,V>
4821	<	(map, null, -1, null, transformer, basis, reducer);
4822	<	}
4823	<
4824	<	/**
4825	<	* Returns a task that when invoked, returns the result of
4826	<	* accumulating the given transformation of all keys using the given
4827	<	* reducer to combine values, and the given basis as an
4828	<	* identity value.
4829	<	*
4830	<	* @param map the map
4831	<	* @param transformer a function returning the transformation
4832	<	* for an element
4833	<	* @param basis the identity (initial default value) for the reduction
4834	<	* @param reducer a commutative associative combining function
4835	<	* @return the task
4836	<	*/
4837	<	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
4838	<	(ConcurrentHashMapV8<K,V> map,
4839	<	ObjectToLong<? super K> transformer,
4840	<	long basis,
4841	<	LongByLongToLong reducer) {
4842	<	if (transformer == null || reducer == null)
4843	<	throw new NullPointerException();
4844	<	return new MapReduceKeysToLongTask<K,V>
4845	<	(map, null, -1, null, transformer, basis, reducer);
4846	<	}
4847	<
4848	<	/**
4849	<	* Returns a task that when invoked, returns the result of
4850	<	* accumulating the given transformation of all keys using the given
4851	<	* reducer to combine values, and the given basis as an
4852	<	* identity value.
4853	<	*
4854	<	* @param map the map
4855	<	* @param transformer a function returning the transformation
4856	<	* for an element
4857	<	* @param basis the identity (initial default value) for the reduction
4858	<	* @param reducer a commutative associative combining function
4859	<	* @return the task
4860	<	*/
4861	<	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
4862	<	(ConcurrentHashMapV8<K,V> map,
4863	<	ObjectToInt<? super K> transformer,
4864	<	int basis,
4865	<	IntByIntToInt reducer) {
4866	<	if (transformer == null || reducer == null)
4867	<	throw new NullPointerException();
4868	<	return new MapReduceKeysToIntTask<K,V>
4869	<	(map, null, -1, null, transformer, basis, reducer);
4870	<	}
4871	<
4872	<	/**
4873	<	* Returns a task that when invoked, performs the given action
4874	<	* for each value.
4875	<	*
4876	<	* @param map the map
4877	<	* @param action the action
4878	<	*/
4879	<	public static <K,V> ForkJoinTask<Void> forEachValue
4880	<	(ConcurrentHashMapV8<K,V> map,
4881	<	Action<V> action) {
4882	<	if (action == null) throw new NullPointerException();
4883	<	return new ForEachValueTask<K,V>(map, null, -1, action);
4884	<	}
4885	<
4886	<	/**
4887	<	* Returns a task that when invoked, performs the given action
4888	<	* for each non-null transformation of each value.
4889	<	*
4890	<	* @param map the map
4891	<	* @param transformer a function returning the transformation
4892	<	* for an element, or null if there is no transformation (in
4893	<	* which case the action is not applied)
4894	<	* @param action the action
4895	<	*/
4896	<	public static <K,V,U> ForkJoinTask<Void> forEachValue
4897	<	(ConcurrentHashMapV8<K,V> map,
4898	<	Fun<? super V, ? extends U> transformer,
4899	<	Action<U> action) {
4900	<	if (transformer == null || action == null)
4901	<	throw new NullPointerException();
4902	<	return new ForEachTransformedValueTask<K,V,U>
4903	<	(map, null, -1, transformer, action);
4904	<	}
4905	<
4906	<	/**
4907	<	* Returns a task that when invoked, returns a non-null result
4908	<	* from applying the given search function on each value, or
4909	<	* null if none.  Upon success, further element processing is
4910	<	* suppressed and the results of any other parallel
4911	<	* invocations of the search function are ignored.
4912	<	*
4913	<	* @param map the map
4914	<	* @param searchFunction a function returning a non-null
4915	<	* result on success, else null
4916	<	* @return the task
4917	<	*/
4918	<	public static <K,V,U> ForkJoinTask<U> searchValues
4919	<	(ConcurrentHashMapV8<K,V> map,
4920	<	Fun<? super V, ? extends U> searchFunction) {
4921	<	if (searchFunction == null) throw new NullPointerException();
4922	<	return new SearchValuesTask<K,V,U>
4923	<	(map, null, -1, searchFunction,
4924	<	new AtomicReference<U>());
4925	<	}
4926	<
4927	<	/**
4928	<	* Returns a task that when invoked, returns the result of
4929	<	* accumulating all values using the given reducer to combine
4930	<	* values, or null if none.
4931	<	*
4932	<	* @param map the map
4933	<	* @param reducer a commutative associative combining function
4934	<	* @return the task
4935	<	*/
4936	<	public static <K,V> ForkJoinTask<V> reduceValues
4937	<	(ConcurrentHashMapV8<K,V> map,
4938	<	BiFun<? super V, ? super V, ? extends V> reducer) {
4939	<	if (reducer == null) throw new NullPointerException();
4940	<	return new ReduceValuesTask<K,V>
4941	<	(map, null, -1, null, reducer);
4942	<	}
4943	<
4944	<	/**
4945	<	* Returns a task that when invoked, returns the result of
4946	<	* accumulating the given transformation of all values using the
4947	<	* given reducer to combine values, or null if none.
4948	<	*
4949	<	* @param map the map
4950	<	* @param transformer a function returning the transformation
4951	<	* for an element, or null if there is no transformation (in
4952	<	* which case it is not combined).
4953	<	* @param reducer a commutative associative combining function
4954	<	* @return the task
4955	<	*/
4956	<	public static <K,V,U> ForkJoinTask<U> reduceValues
4957	<	(ConcurrentHashMapV8<K,V> map,
4958	<	Fun<? super V, ? extends U> transformer,
4959	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4960	<	if (transformer == null || reducer == null)
4961	<	throw new NullPointerException();
4962	<	return new MapReduceValuesTask<K,V,U>
4963	<	(map, null, -1, null, transformer, reducer);
4964	<	}
4965	<
4966	<	/**
4967	<	* Returns a task that when invoked, returns the result of
4968	<	* accumulating the given transformation of all values using the
4969	<	* given reducer to combine values, and the given basis as an
4970	<	* identity value.
4971	<	*
4972	<	* @param map the map
4973	<	* @param transformer a function returning the transformation
4974	<	* for an element
4975	<	* @param basis the identity (initial default value) for the reduction
4976	<	* @param reducer a commutative associative combining function
4977	<	* @return the task
4978	<	*/
4979	<	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
4980	<	(ConcurrentHashMapV8<K,V> map,
4981	<	ObjectToDouble<? super V> transformer,
4982	<	double basis,
4983	<	DoubleByDoubleToDouble reducer) {
4984	<	if (transformer == null || reducer == null)
4985	<	throw new NullPointerException();
4986	<	return new MapReduceValuesToDoubleTask<K,V>
4987	<	(map, null, -1, null, transformer, basis, reducer);
4988	<	}
4989	<
4990	<	/**
4991	<	* Returns a task that when invoked, returns the result of
4992	<	* accumulating the given transformation of all values using the
4993	<	* given reducer to combine values, and the given basis as an
4994	<	* identity value.
4995	<	*
4996	<	* @param map the map
4997	<	* @param transformer a function returning the transformation
4998	<	* for an element
4999	<	* @param basis the identity (initial default value) for the reduction
5000	<	* @param reducer a commutative associative combining function
5001	<	* @return the task
5002	<	*/
5003	<	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
5004	<	(ConcurrentHashMapV8<K,V> map,
5005	<	ObjectToLong<? super V> transformer,
5006	<	long basis,
5007	<	LongByLongToLong reducer) {
5008	<	if (transformer == null || reducer == null)
5009	<	throw new NullPointerException();
5010	<	return new MapReduceValuesToLongTask<K,V>
5011	<	(map, null, -1, null, transformer, basis, reducer);
5012	<	}
5013	<
5014	<	/**
5015	<	* Returns a task that when invoked, returns the result of
5016	<	* accumulating the given transformation of all values using the
5017	<	* given reducer to combine values, and the given basis as an
5018	<	* identity value.
5019	<	*
5020	<	* @param map the map
5021	<	* @param transformer a function returning the transformation
5022	<	* for an element
5023	<	* @param basis the identity (initial default value) for the reduction
5024	<	* @param reducer a commutative associative combining function
5025	<	* @return the task
5026	<	*/
5027	<	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
5028	<	(ConcurrentHashMapV8<K,V> map,
5029	<	ObjectToInt<? super V> transformer,
5030	<	int basis,
5031	<	IntByIntToInt reducer) {
5032	<	if (transformer == null || reducer == null)
5033	<	throw new NullPointerException();
5034	<	return new MapReduceValuesToIntTask<K,V>
5035	<	(map, null, -1, null, transformer, basis, reducer);
5036	<	}
5037	<
5038	<	/**
5039	<	* Returns a task that when invoked, perform the given action
5040	<	* for each entry.
5041	<	*
5042	<	* @param map the map
5043	<	* @param action the action
5044	<	*/
5045	<	public static <K,V> ForkJoinTask<Void> forEachEntry
5046	<	(ConcurrentHashMapV8<K,V> map,
5047	<	Action<Map.Entry<K,V>> action) {
5048	<	if (action == null) throw new NullPointerException();
5049	<	return new ForEachEntryTask<K,V>(map, null, -1, action);
5050	<	}
5051	<
5052	<	/**
5053	<	* Returns a task that when invoked, perform the given action
5054	<	* for each non-null transformation of each entry.
5055	<	*
5056	<	* @param map the map
5057	<	* @param transformer a function returning the transformation
5058	<	* for an element, or null if there is no transformation (in
5059	<	* which case the action is not applied)
5060	<	* @param action the action
5061	<	*/
5062	<	public static <K,V,U> ForkJoinTask<Void> forEachEntry
5063	<	(ConcurrentHashMapV8<K,V> map,
5064	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5065	<	Action<U> action) {
5066	<	if (transformer == null || action == null)
5067	<	throw new NullPointerException();
5068	<	return new ForEachTransformedEntryTask<K,V,U>
5069	<	(map, null, -1, transformer, action);
5070	<	}
5071	<
5072	<	/**
5073	<	* Returns a task that when invoked, returns a non-null result
5074	<	* from applying the given search function on each entry, or
5075	<	* null if none.  Upon success, further element processing is
5076	<	* suppressed and the results of any other parallel
5077	<	* invocations of the search function are ignored.
5078	<	*
5079	<	* @param map the map
5080	<	* @param searchFunction a function returning a non-null
5081	<	* result on success, else null
5082	<	* @return the task
5083	<	*/
5084	<	public static <K,V,U> ForkJoinTask<U> searchEntries
5085	<	(ConcurrentHashMapV8<K,V> map,
5086	<	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
5087	<	if (searchFunction == null) throw new NullPointerException();
5088	<	return new SearchEntriesTask<K,V,U>
5089	<	(map, null, -1, searchFunction,
5090	<	new AtomicReference<U>());
5091	<	}
5092	<
5093	<	/**
5094	<	* Returns a task that when invoked, returns the result of
5095	<	* accumulating all entries using the given reducer to combine
5096	<	* values, or null if none.
5097	<	*
5098	<	* @param map the map
5099	<	* @param reducer a commutative associative combining function
5100	<	* @return the task
5101	<	*/
5102	<	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
5103	<	(ConcurrentHashMapV8<K,V> map,
5104	<	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5105	<	if (reducer == null) throw new NullPointerException();
5106	<	return new ReduceEntriesTask<K,V>
5107	<	(map, null, -1, null, reducer);
5108	<	}
5109	<
5110	<	/**
5111	<	* Returns a task that when invoked, returns the result of
5112	<	* accumulating the given transformation of all entries using the
5113	<	* given reducer to combine values, or null if none.
5114	<	*
5115	<	* @param map the map
5116	<	* @param transformer a function returning the transformation
5117	<	* for an element, or null if there is no transformation (in
5118	<	* which case it is not combined).
5119	<	* @param reducer a commutative associative combining function
5120	<	* @return the task
5121	<	*/
5122	<	public static <K,V,U> ForkJoinTask<U> reduceEntries
5123	<	(ConcurrentHashMapV8<K,V> map,
5124	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5125	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5126	<	if (transformer == null || reducer == null)
5127	<	throw new NullPointerException();
5128	<	return new MapReduceEntriesTask<K,V,U>
5129	<	(map, null, -1, null, transformer, reducer);
5130	<	}
5131	<
5132	<	/**
5133	<	* Returns a task that when invoked, returns the result of
5134	<	* accumulating the given transformation of all entries using the
5135	<	* given reducer to combine values, and the given basis as an
5136	<	* identity value.
5137	<	*
5138	<	* @param map the map
5139	<	* @param transformer a function returning the transformation
5140	<	* for an element
5141	<	* @param basis the identity (initial default value) for the reduction
5142	<	* @param reducer a commutative associative combining function
5143	<	* @return the task
5144	<	*/
5145	<	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
5146	<	(ConcurrentHashMapV8<K,V> map,
5147	<	ObjectToDouble<Map.Entry<K,V>> transformer,
5148	<	double basis,
5149	<	DoubleByDoubleToDouble reducer) {
5150	<	if (transformer == null || reducer == null)
5151	<	throw new NullPointerException();
5152	<	return new MapReduceEntriesToDoubleTask<K,V>
5153	<	(map, null, -1, null, transformer, basis, reducer);
5154	<	}
5155	<
5156	<	/**
5157	<	* Returns a task that when invoked, returns the result of
5158	<	* accumulating the given transformation of all entries using the
5159	<	* given reducer to combine values, and the given basis as an
5160	<	* identity value.
5161	<	*
5162	<	* @param map the map
5163	<	* @param transformer a function returning the transformation
5164	<	* for an element
5165	<	* @param basis the identity (initial default value) for the reduction
5166	<	* @param reducer a commutative associative combining function
5167	<	* @return the task
5168	<	*/
5169	<	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
5170	<	(ConcurrentHashMapV8<K,V> map,
5171	<	ObjectToLong<Map.Entry<K,V>> transformer,
5172	<	long basis,
5173	<	LongByLongToLong reducer) {
5174	<	if (transformer == null || reducer == null)
5175	<	throw new NullPointerException();
5176	<	return new MapReduceEntriesToLongTask<K,V>
5177	<	(map, null, -1, null, transformer, basis, reducer);
4567	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4568	>	Node<K,V>[] tab;        // same as Traverser
4569	>	Node<K,V> next;
4570	>	int index;
4571	>	int baseIndex;
4572	>	int baseLimit;
4573	>	final int baseSize;
4574	>	int batch;              // split control
4575	>
4576	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4577	>	super(par);
4578	>	this.batch = b;
4579	>	this.index = this.baseIndex = i;
4580	>	if ((this.tab = t) == null)
4581	>	this.baseSize = this.baseLimit = 0;
4582	>	else if (par == null)
4583	>	this.baseSize = this.baseLimit = t.length;
4584	>	else {
4585	>	this.baseLimit = f;
4586	>	this.baseSize = par.baseSize;
4587	>	}
4588		}
4589
4590		/**
4591	<	* Returns a task that when invoked, returns the result of
5182	<	* accumulating the given transformation of all entries using the
5183	<	* given reducer to combine values, and the given basis as an
5184	<	* identity value.
5185	<	*
5186	<	* @param map the map
5187	<	* @param transformer a function returning the transformation
5188	<	* for an element
5189	<	* @param basis the identity (initial default value) for the reduction
5190	<	* @param reducer a commutative associative combining function
5191	<	* @return the task
4591	>	* Same as Traverser version
4592		*/
4593	<	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
4594	<	(ConcurrentHashMapV8<K,V> map,
4595	<	ObjectToInt<Map.Entry<K,V>> transformer,
4596	<	int basis,
4597	<	IntByIntToInt reducer) {
4598	<	if (transformer == null || reducer == null)
4599	<	throw new NullPointerException();
4600	<	return new MapReduceEntriesToIntTask<K,V>
4601	<	(map, null, -1, null, transformer, basis, reducer);
4593	>	final Node<K,V> advance() {
4594	>	Node<K,V> e;
4595	>	if ((e = next) != null)
4596	>	e = e.next;
4597	>	for (;;) {
4598	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4599	>	if (e != null)
4600	>	return next = e;
4601	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4602	>	(n = t.length) <= (i = index) || i < 0)
4603	>	return next = null;
4604	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4605	>	if (e instanceof ForwardingNode) {
4606	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4607	>	e = null;
4608	>	continue;
4609	>	}
4610	>	else if (e instanceof TreeBin)
4611	>	e = ((TreeBin<K,V>)e).first;
4612	>	else
4613	>	e = null;
4614	>	}
4615	>	if ((index += baseSize) >= n)
4616	>	index = ++baseIndex;    // visit upper slots if present
4617	>	}
4618		}
4619		}
4620
5205	–	// -------------------------------------------------------
5206	–
4621		/*
4622		* Task classes. Coded in a regular but ugly format/style to
4623		* simplify checks that each variant differs in the right way from
#	Line 5211 | Line 4625 | public class ConcurrentHashMapV8<K, V>
4625		* that we've already null-checked task arguments, so we force
4626		* simplest hoisted bypass to help avoid convoluted traps.
4627		*/
4628	<
4629	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4630	<	extends Traverser<K,V,Void> {
4631	<	final Action<K> action;
4628	>	@SuppressWarnings("serial")
4629	>	static final class ForEachKeyTask<K,V>
4630	>	extends BulkTask<K,V,Void> {
4631	>	final Action<? super K> action;
4632		ForEachKeyTask
4633	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4634	<	Action<K> action) {
4635	<	super(m, p, b);
4633	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4634	>	Action<? super K> action) {
4635	>	super(p, b, i, f, t);
4636		this.action = action;
4637		}
4638	<	@SuppressWarnings("unchecked") public final void compute() {
4639	<	final Action<K> action;
4638	>	public final void compute() {
4639	>	final Action<? super K> action;
4640		if ((action = this.action) != null) {
4641	<	for (int b; (b = preSplit()) > 0;)
4642	<	new ForEachKeyTask<K,V>(map, this, b, action).fork();
4643	<	while (advance() != null)
4644	<	action.apply((K)nextKey);
4641	>	for (int i = baseIndex, f, h; batch > 0 &&
4642	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4643	>	addToPendingCount(1);
4644	>	new ForEachKeyTask<K,V>
4645	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4646	>	action).fork();
4647	>	}
4648	>	for (Node<K,V> p; (p = advance()) != null;)
4649	>	action.apply(p.key);
4650		propagateCompletion();
4651		}
4652		}
4653		}
4654
4655	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4656	<	extends Traverser<K,V,Void> {
4657	<	final Action<V> action;
4655	>	@SuppressWarnings("serial")
4656	>	static final class ForEachValueTask<K,V>
4657	>	extends BulkTask<K,V,Void> {
4658	>	final Action<? super V> action;
4659		ForEachValueTask
4660	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4661	<	Action<V> action) {
4662	<	super(m, p, b);
4660	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4661	>	Action<? super V> action) {
4662	>	super(p, b, i, f, t);
4663		this.action = action;
4664		}
4665	<	@SuppressWarnings("unchecked") public final void compute() {
4666	<	final Action<V> action;
4665	>	public final void compute() {
4666	>	final Action<? super V> action;
4667		if ((action = this.action) != null) {
4668	<	for (int b; (b = preSplit()) > 0;)
4669	<	new ForEachValueTask<K,V>(map, this, b, action).fork();
4670	<	Object v;
4671	<	while ((v = advance()) != null)
4672	<	action.apply((V)v);
4668	>	for (int i = baseIndex, f, h; batch > 0 &&
4669	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4670	>	addToPendingCount(1);
4671	>	new ForEachValueTask<K,V>
4672	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4673	>	action).fork();
4674	>	}
4675	>	for (Node<K,V> p; (p = advance()) != null;)
4676	>	action.apply(p.val);
4677		propagateCompletion();
4678		}
4679		}
4680		}
4681
4682	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4683	<	extends Traverser<K,V,Void> {
4684	<	final Action<Entry<K,V>> action;
4682	>	@SuppressWarnings("serial")
4683	>	static final class ForEachEntryTask<K,V>
4684	>	extends BulkTask<K,V,Void> {
4685	>	final Action<? super Entry<K,V>> action;
4686		ForEachEntryTask
4687	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4688	<	Action<Entry<K,V>> action) {
4689	<	super(m, p, b);
4687	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4688	>	Action<? super Entry<K,V>> action) {
4689	>	super(p, b, i, f, t);
4690		this.action = action;
4691		}
4692	<	@SuppressWarnings("unchecked") public final void compute() {
4693	<	final Action<Entry<K,V>> action;
4692	>	public final void compute() {
4693	>	final Action<? super Entry<K,V>> action;
4694		if ((action = this.action) != null) {
4695	<	for (int b; (b = preSplit()) > 0;)
4696	<	new ForEachEntryTask<K,V>(map, this, b, action).fork();
4697	<	Object v;
4698	<	while ((v = advance()) != null)
4699	<	action.apply(entryFor((K)nextKey, (V)v));
4695	>	for (int i = baseIndex, f, h; batch > 0 &&
4696	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4697	>	addToPendingCount(1);
4698	>	new ForEachEntryTask<K,V>
4699	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4700	>	action).fork();
4701	>	}
4702	>	for (Node<K,V> p; (p = advance()) != null; )
4703	>	action.apply(p);
4704		propagateCompletion();
4705		}
4706		}
4707		}
4708
4709	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4710	<	extends Traverser<K,V,Void> {
4711	<	final BiAction<K,V> action;
4709	>	@SuppressWarnings("serial")
4710	>	static final class ForEachMappingTask<K,V>
4711	>	extends BulkTask<K,V,Void> {
4712	>	final BiAction<? super K, ? super V> action;
4713		ForEachMappingTask
4714	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4715	<	BiAction<K,V> action) {
4716	<	super(m, p, b);
4714	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4715	>	BiAction<? super K,? super V> action) {
4716	>	super(p, b, i, f, t);
4717		this.action = action;
4718		}
4719	<	@SuppressWarnings("unchecked") public final void compute() {
4720	<	final BiAction<K,V> action;
4719	>	public final void compute() {
4720	>	final BiAction<? super K, ? super V> action;
4721		if ((action = this.action) != null) {
4722	<	for (int b; (b = preSplit()) > 0;)
4723	<	new ForEachMappingTask<K,V>(map, this, b, action).fork();
4724	<	Object v;
4725	<	while ((v = advance()) != null)
4726	<	action.apply((K)nextKey, (V)v);
4722	>	for (int i = baseIndex, f, h; batch > 0 &&
4723	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4724	>	addToPendingCount(1);
4725	>	new ForEachMappingTask<K,V>
4726	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4727	>	action).fork();
4728	>	}
4729	>	for (Node<K,V> p; (p = advance()) != null; )
4730	>	action.apply(p.key, p.val);
4731		propagateCompletion();
4732		}
4733		}
4734		}
4735
4736	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4737	<	extends Traverser<K,V,Void> {
4736	>	@SuppressWarnings("serial")
4737	>	static final class ForEachTransformedKeyTask<K,V,U>
4738	>	extends BulkTask<K,V,Void> {
4739		final Fun<? super K, ? extends U> transformer;
4740	<	final Action<U> action;
4740	>	final Action<? super U> action;
4741		ForEachTransformedKeyTask
4742	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4743	<	Fun<? super K, ? extends U> transformer, Action<U> action) {
4744	<	super(m, p, b);
4742	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4743	>	Fun<? super K, ? extends U> transformer, Action<? super U> action) {
4744	>	super(p, b, i, f, t);
4745		this.transformer = transformer; this.action = action;
4746		}
4747	<	@SuppressWarnings("unchecked") public final void compute() {
4747	>	public final void compute() {
4748		final Fun<? super K, ? extends U> transformer;
4749	<	final Action<U> action;
4749	>	final Action<? super U> action;
4750		if ((transformer = this.transformer) != null &&
4751		(action = this.action) != null) {
4752	<	for (int b; (b = preSplit()) > 0;)
4752	>	for (int i = baseIndex, f, h; batch > 0 &&
4753	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4754	>	addToPendingCount(1);
4755		new ForEachTransformedKeyTask<K,V,U>
4756	<	(map, this, b, transformer, action).fork();
4757	<	U u;
4758	<	while (advance() != null) {
4759	<	if ((u = transformer.apply((K)nextKey)) != null)
4756	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4757	>	transformer, action).fork();
4758	>	}
4759	>	for (Node<K,V> p; (p = advance()) != null; ) {
4760	>	U u;
4761	>	if ((u = transformer.apply(p.key)) != null)
4762		action.apply(u);
4763		}
4764		propagateCompletion();
#	Line 5327 | Line 4766 | public class ConcurrentHashMapV8<K, V>
4766		}
4767		}
4768
4769	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4770	<	extends Traverser<K,V,Void> {
4769	>	@SuppressWarnings("serial")
4770	>	static final class ForEachTransformedValueTask<K,V,U>
4771	>	extends BulkTask<K,V,Void> {
4772		final Fun<? super V, ? extends U> transformer;
4773	<	final Action<U> action;
4773	>	final Action<? super U> action;
4774		ForEachTransformedValueTask
4775	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4776	<	Fun<? super V, ? extends U> transformer, Action<U> action) {
4777	<	super(m, p, b);
4775	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4776	>	Fun<? super V, ? extends U> transformer, Action<? super U> action) {
4777	>	super(p, b, i, f, t);
4778		this.transformer = transformer; this.action = action;
4779		}
4780	<	@SuppressWarnings("unchecked") public final void compute() {
4780	>	public final void compute() {
4781		final Fun<? super V, ? extends U> transformer;
4782	<	final Action<U> action;
4782	>	final Action<? super U> action;
4783		if ((transformer = this.transformer) != null &&
4784		(action = this.action) != null) {
4785	<	for (int b; (b = preSplit()) > 0;)
4785	>	for (int i = baseIndex, f, h; batch > 0 &&
4786	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4787	>	addToPendingCount(1);
4788		new ForEachTransformedValueTask<K,V,U>
4789	<	(map, this, b, transformer, action).fork();
4790	<	Object v; U u;
4791	<	while ((v = advance()) != null) {
4792	<	if ((u = transformer.apply((V)v)) != null)
4789	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4790	>	transformer, action).fork();
4791	>	}
4792	>	for (Node<K,V> p; (p = advance()) != null; ) {
4793	>	U u;
4794	>	if ((u = transformer.apply(p.val)) != null)
4795		action.apply(u);
4796		}
4797		propagateCompletion();
#	Line 5355 | Line 4799 | public class ConcurrentHashMapV8<K, V>
4799		}
4800		}
4801
4802	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4803	<	extends Traverser<K,V,Void> {
4802	>	@SuppressWarnings("serial")
4803	>	static final class ForEachTransformedEntryTask<K,V,U>
4804	>	extends BulkTask<K,V,Void> {
4805		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4806	<	final Action<U> action;
4806	>	final Action<? super U> action;
4807		ForEachTransformedEntryTask
4808	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4809	<	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<U> action) {
4810	<	super(m, p, b);
4808	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4809	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<? super U> action) {
4810	>	super(p, b, i, f, t);
4811		this.transformer = transformer; this.action = action;
4812		}
4813	<	@SuppressWarnings("unchecked") public final void compute() {
4813	>	public final void compute() {
4814		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4815	<	final Action<U> action;
4815	>	final Action<? super U> action;
4816		if ((transformer = this.transformer) != null &&
4817		(action = this.action) != null) {
4818	<	for (int b; (b = preSplit()) > 0;)
4818	>	for (int i = baseIndex, f, h; batch > 0 &&
4819	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4820	>	addToPendingCount(1);
4821		new ForEachTransformedEntryTask<K,V,U>
4822	<	(map, this, b, transformer, action).fork();
4823	<	Object v; U u;
4824	<	while ((v = advance()) != null) {
4825	<	if ((u = transformer.apply(entryFor((K)nextKey,
4826	<	(V)v))) != null)
4822	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4823	>	transformer, action).fork();
4824	>	}
4825	>	for (Node<K,V> p; (p = advance()) != null; ) {
4826	>	U u;
4827	>	if ((u = transformer.apply(p)) != null)
4828		action.apply(u);
4829		}
4830		propagateCompletion();
#	Line 5384 | Line 4832 | public class ConcurrentHashMapV8<K, V>
4832		}
4833		}
4834
4835	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4836	<	extends Traverser<K,V,Void> {
4835	>	@SuppressWarnings("serial")
4836	>	static final class ForEachTransformedMappingTask<K,V,U>
4837	>	extends BulkTask<K,V,Void> {
4838		final BiFun<? super K, ? super V, ? extends U> transformer;
4839	<	final Action<U> action;
4839	>	final Action<? super U> action;
4840		ForEachTransformedMappingTask
4841	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4841	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4842		BiFun<? super K, ? super V, ? extends U> transformer,
4843	<	Action<U> action) {
4844	<	super(m, p, b);
4843	>	Action<? super U> action) {
4844	>	super(p, b, i, f, t);
4845		this.transformer = transformer; this.action = action;
4846		}
4847	<	@SuppressWarnings("unchecked") public final void compute() {
4847	>	public final void compute() {
4848		final BiFun<? super K, ? super V, ? extends U> transformer;
4849	<	final Action<U> action;
4849	>	final Action<? super U> action;
4850		if ((transformer = this.transformer) != null &&
4851		(action = this.action) != null) {
4852	<	for (int b; (b = preSplit()) > 0;)
4852	>	for (int i = baseIndex, f, h; batch > 0 &&
4853	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4854	>	addToPendingCount(1);
4855		new ForEachTransformedMappingTask<K,V,U>
4856	<	(map, this, b, transformer, action).fork();
4857	<	Object v; U u;
4858	<	while ((v = advance()) != null) {
4859	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
4856	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4857	>	transformer, action).fork();
4858	>	}
4859	>	for (Node<K,V> p; (p = advance()) != null; ) {
4860	>	U u;
4861	>	if ((u = transformer.apply(p.key, p.val)) != null)
4862		action.apply(u);
4863		}
4864		propagateCompletion();
#	Line 5413 | Line 4866 | public class ConcurrentHashMapV8<K, V>
4866		}
4867		}
4868
4869	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4870	<	extends Traverser<K,V,U> {
4869	>	@SuppressWarnings("serial")
4870	>	static final class SearchKeysTask<K,V,U>
4871	>	extends BulkTask<K,V,U> {
4872		final Fun<? super K, ? extends U> searchFunction;
4873		final AtomicReference<U> result;
4874		SearchKeysTask
4875	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4875	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4876		Fun<? super K, ? extends U> searchFunction,
4877		AtomicReference<U> result) {
4878	<	super(m, p, b);
4878	>	super(p, b, i, f, t);
4879		this.searchFunction = searchFunction; this.result = result;
4880		}
4881		public final U getRawResult() { return result.get(); }
4882	<	@SuppressWarnings("unchecked") public final void compute() {
4882	>	public final void compute() {
4883		final Fun<? super K, ? extends U> searchFunction;
4884		final AtomicReference<U> result;
4885		if ((searchFunction = this.searchFunction) != null &&
4886		(result = this.result) != null) {
4887	<	for (int b;;) {
4887	>	for (int i = baseIndex, f, h; batch > 0 &&
4888	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4889		if (result.get() != null)
4890		return;
4891	<	if ((b = preSplit()) <= 0)
5437	<	break;
4891	>	addToPendingCount(1);
4892		new SearchKeysTask<K,V,U>
4893	<	(map, this, b, searchFunction, result).fork();
4893	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4894	>	searchFunction, result).fork();
4895		}
4896		while (result.get() == null) {
4897		U u;
4898	<	if (advance() == null) {
4898	>	Node<K,V> p;
4899	>	if ((p = advance()) == null) {
4900		propagateCompletion();
4901		break;
4902		}
4903	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
4903	>	if ((u = searchFunction.apply(p.key)) != null) {
4904		if (result.compareAndSet(null, u))
4905		quietlyCompleteRoot();
4906		break;
#	Line 5454 | Line 4910 | public class ConcurrentHashMapV8<K, V>
4910		}
4911		}
4912
4913	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
4914	<	extends Traverser<K,V,U> {
4913	>	@SuppressWarnings("serial")
4914	>	static final class SearchValuesTask<K,V,U>
4915	>	extends BulkTask<K,V,U> {
4916		final Fun<? super V, ? extends U> searchFunction;
4917		final AtomicReference<U> result;
4918		SearchValuesTask
4919	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4919	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4920		Fun<? super V, ? extends U> searchFunction,
4921		AtomicReference<U> result) {
4922	<	super(m, p, b);
4922	>	super(p, b, i, f, t);
4923		this.searchFunction = searchFunction; this.result = result;
4924		}
4925		public final U getRawResult() { return result.get(); }
4926	<	@SuppressWarnings("unchecked") public final void compute() {
4926	>	public final void compute() {
4927		final Fun<? super V, ? extends U> searchFunction;
4928		final AtomicReference<U> result;
4929		if ((searchFunction = this.searchFunction) != null &&
4930		(result = this.result) != null) {
4931	<	for (int b;;) {
4931	>	for (int i = baseIndex, f, h; batch > 0 &&
4932	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4933		if (result.get() != null)
4934		return;
4935	<	if ((b = preSplit()) <= 0)
5478	<	break;
4935	>	addToPendingCount(1);
4936		new SearchValuesTask<K,V,U>
4937	<	(map, this, b, searchFunction, result).fork();
4937	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4938	>	searchFunction, result).fork();
4939		}
4940		while (result.get() == null) {
4941	<	Object v; U u;
4942	<	if ((v = advance()) == null) {
4941	>	U u;
4942	>	Node<K,V> p;
4943	>	if ((p = advance()) == null) {
4944		propagateCompletion();
4945		break;
4946		}
4947	<	if ((u = searchFunction.apply((V)v)) != null) {
4947	>	if ((u = searchFunction.apply(p.val)) != null) {
4948		if (result.compareAndSet(null, u))
4949		quietlyCompleteRoot();
4950		break;
#	Line 5495 | Line 4954 | public class ConcurrentHashMapV8<K, V>
4954		}
4955		}
4956
4957	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
4958	<	extends Traverser<K,V,U> {
4957	>	@SuppressWarnings("serial")
4958	>	static final class SearchEntriesTask<K,V,U>
4959	>	extends BulkTask<K,V,U> {
4960		final Fun<Entry<K,V>, ? extends U> searchFunction;
4961		final AtomicReference<U> result;
4962		SearchEntriesTask
4963	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4963	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4964		Fun<Entry<K,V>, ? extends U> searchFunction,
4965		AtomicReference<U> result) {
4966	<	super(m, p, b);
4966	>	super(p, b, i, f, t);
4967		this.searchFunction = searchFunction; this.result = result;
4968		}
4969		public final U getRawResult() { return result.get(); }
4970	<	@SuppressWarnings("unchecked") public final void compute() {
4970	>	public final void compute() {
4971		final Fun<Entry<K,V>, ? extends U> searchFunction;
4972		final AtomicReference<U> result;
4973		if ((searchFunction = this.searchFunction) != null &&
4974		(result = this.result) != null) {
4975	<	for (int b;;) {
4975	>	for (int i = baseIndex, f, h; batch > 0 &&
4976	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4977		if (result.get() != null)
4978		return;
4979	<	if ((b = preSplit()) <= 0)
5519	<	break;
4979	>	addToPendingCount(1);
4980		new SearchEntriesTask<K,V,U>
4981	<	(map, this, b, searchFunction, result).fork();
4981	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4982	>	searchFunction, result).fork();
4983		}
4984		while (result.get() == null) {
4985	<	Object v; U u;
4986	<	if ((v = advance()) == null) {
4985	>	U u;
4986	>	Node<K,V> p;
4987	>	if ((p = advance()) == null) {
4988		propagateCompletion();
4989		break;
4990		}
4991	<	if ((u = searchFunction.apply(entryFor((K)nextKey,
5530	<	(V)v))) != null) {
4991	>	if ((u = searchFunction.apply(p)) != null) {
4992		if (result.compareAndSet(null, u))
4993		quietlyCompleteRoot();
4994		return;
#	Line 5537 | Line 4998 | public class ConcurrentHashMapV8<K, V>
4998		}
4999		}
5000
5001	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5002	<	extends Traverser<K,V,U> {
5001	>	@SuppressWarnings("serial")
5002	>	static final class SearchMappingsTask<K,V,U>
5003	>	extends BulkTask<K,V,U> {
5004		final BiFun<? super K, ? super V, ? extends U> searchFunction;
5005		final AtomicReference<U> result;
5006		SearchMappingsTask
5007	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5007	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5008		BiFun<? super K, ? super V, ? extends U> searchFunction,
5009		AtomicReference<U> result) {
5010	<	super(m, p, b);
5010	>	super(p, b, i, f, t);
5011		this.searchFunction = searchFunction; this.result = result;
5012		}
5013		public final U getRawResult() { return result.get(); }
5014	<	@SuppressWarnings("unchecked") public final void compute() {
5014	>	public final void compute() {
5015		final BiFun<? super K, ? super V, ? extends U> searchFunction;
5016		final AtomicReference<U> result;
5017		if ((searchFunction = this.searchFunction) != null &&
5018		(result = this.result) != null) {
5019	<	for (int b;;) {
5019	>	for (int i = baseIndex, f, h; batch > 0 &&
5020	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5021		if (result.get() != null)
5022		return;
5023	<	if ((b = preSplit()) <= 0)
5561	<	break;
5023	>	addToPendingCount(1);
5024		new SearchMappingsTask<K,V,U>
5025	<	(map, this, b, searchFunction, result).fork();
5025	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5026	>	searchFunction, result).fork();
5027		}
5028		while (result.get() == null) {
5029	<	Object v; U u;
5030	<	if ((v = advance()) == null) {
5029	>	U u;
5030	>	Node<K,V> p;
5031	>	if ((p = advance()) == null) {
5032		propagateCompletion();
5033		break;
5034		}
5035	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5035	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5036		if (result.compareAndSet(null, u))
5037		quietlyCompleteRoot();
5038		break;
#	Line 5578 | Line 5042 | public class ConcurrentHashMapV8<K, V>
5042		}
5043		}
5044
5045	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5046	<	extends Traverser<K,V,K> {
5045	>	@SuppressWarnings("serial")
5046	>	static final class ReduceKeysTask<K,V>
5047	>	extends BulkTask<K,V,K> {
5048		final BiFun<? super K, ? super K, ? extends K> reducer;
5049		K result;
5050		ReduceKeysTask<K,V> rights, nextRight;
5051		ReduceKeysTask
5052	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5052	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5053		ReduceKeysTask<K,V> nextRight,
5054		BiFun<? super K, ? super K, ? extends K> reducer) {
5055	<	super(m, p, b); this.nextRight = nextRight;
5055	>	super(p, b, i, f, t); this.nextRight = nextRight;
5056		this.reducer = reducer;
5057		}
5058		public final K getRawResult() { return result; }
5059	<	@SuppressWarnings("unchecked") public final void compute() {
5059	>	public final void compute() {
5060		final BiFun<? super K, ? super K, ? extends K> reducer;
5061		if ((reducer = this.reducer) != null) {
5062	<	for (int b; (b = preSplit()) > 0;)
5062	>	for (int i = baseIndex, f, h; batch > 0 &&
5063	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5064	>	addToPendingCount(1);
5065		(rights = new ReduceKeysTask<K,V>
5066	<	(map, this, b, rights, reducer)).fork();
5066	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5067	>	rights, reducer)).fork();
5068	>	}
5069		K r = null;
5070	<	while (advance() != null) {
5071	<	K u = (K)nextKey;
5072	<	r = (r == null) ? u : reducer.apply(r, u);
5070	>	for (Node<K,V> p; (p = advance()) != null; ) {
5071	>	K u = p.key;
5072	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5073		}
5074		result = r;
5075		CountedCompleter<?> c;
5076		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5077	<	ReduceKeysTask<K,V>
5077	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5078		t = (ReduceKeysTask<K,V>)c,
5079		s = t.rights;
5080		while (s != null) {
#	Line 5620 | Line 5089 | public class ConcurrentHashMapV8<K, V>
5089		}
5090		}
5091
5092	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5093	<	extends Traverser<K,V,V> {
5092	>	@SuppressWarnings("serial")
5093	>	static final class ReduceValuesTask<K,V>
5094	>	extends BulkTask<K,V,V> {
5095		final BiFun<? super V, ? super V, ? extends V> reducer;
5096		V result;
5097		ReduceValuesTask<K,V> rights, nextRight;
5098		ReduceValuesTask
5099	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5099	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5100		ReduceValuesTask<K,V> nextRight,
5101		BiFun<? super V, ? super V, ? extends V> reducer) {
5102	<	super(m, p, b); this.nextRight = nextRight;
5102	>	super(p, b, i, f, t); this.nextRight = nextRight;
5103		this.reducer = reducer;
5104		}
5105		public final V getRawResult() { return result; }
5106	<	@SuppressWarnings("unchecked") public final void compute() {
5106	>	public final void compute() {
5107		final BiFun<? super V, ? super V, ? extends V> reducer;
5108		if ((reducer = this.reducer) != null) {
5109	<	for (int b; (b = preSplit()) > 0;)
5109	>	for (int i = baseIndex, f, h; batch > 0 &&
5110	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5111	>	addToPendingCount(1);
5112		(rights = new ReduceValuesTask<K,V>
5113	<	(map, this, b, rights, reducer)).fork();
5113	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5114	>	rights, reducer)).fork();
5115	>	}
5116		V r = null;
5117	<	Object v;
5118	<	while ((v = advance()) != null) {
5119	<	V u = (V)v;
5646	<	r = (r == null) ? u : reducer.apply(r, u);
5117	>	for (Node<K,V> p; (p = advance()) != null; ) {
5118	>	V v = p.val;
5119	>	r = (r == null) ? v : reducer.apply(r, v);
5120		}
5121		result = r;
5122		CountedCompleter<?> c;
5123		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5124	<	ReduceValuesTask<K,V>
5124	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5125		t = (ReduceValuesTask<K,V>)c,
5126		s = t.rights;
5127		while (s != null) {
#	Line 5663 | Line 5136 | public class ConcurrentHashMapV8<K, V>
5136		}
5137		}
5138
5139	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5140	<	extends Traverser<K,V,Map.Entry<K,V>> {
5139	>	@SuppressWarnings("serial")
5140	>	static final class ReduceEntriesTask<K,V>
5141	>	extends BulkTask<K,V,Map.Entry<K,V>> {
5142		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5143		Map.Entry<K,V> result;
5144		ReduceEntriesTask<K,V> rights, nextRight;
5145		ReduceEntriesTask
5146	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5146	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5147		ReduceEntriesTask<K,V> nextRight,
5148		BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5149	<	super(m, p, b); this.nextRight = nextRight;
5149	>	super(p, b, i, f, t); this.nextRight = nextRight;
5150		this.reducer = reducer;
5151		}
5152		public final Map.Entry<K,V> getRawResult() { return result; }
5153	<	@SuppressWarnings("unchecked") public final void compute() {
5153	>	public final void compute() {
5154		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5155		if ((reducer = this.reducer) != null) {
5156	<	for (int b; (b = preSplit()) > 0;)
5156	>	for (int i = baseIndex, f, h; batch > 0 &&
5157	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5158	>	addToPendingCount(1);
5159		(rights = new ReduceEntriesTask<K,V>
5160	<	(map, this, b, rights, reducer)).fork();
5161	<	Map.Entry<K,V> r = null;
5686	<	Object v;
5687	<	while ((v = advance()) != null) {
5688	<	Map.Entry<K,V> u = entryFor((K)nextKey, (V)v);
5689	<	r = (r == null) ? u : reducer.apply(r, u);
5160	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5161	>	rights, reducer)).fork();
5162		}
5163	+	Map.Entry<K,V> r = null;
5164	+	for (Node<K,V> p; (p = advance()) != null; )
5165	+	r = (r == null) ? p : reducer.apply(r, p);
5166		result = r;
5167		CountedCompleter<?> c;
5168		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5169	<	ReduceEntriesTask<K,V>
5169	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5170		t = (ReduceEntriesTask<K,V>)c,
5171		s = t.rights;
5172		while (s != null) {
#	Line 5706 | Line 5181 | public class ConcurrentHashMapV8<K, V>
5181		}
5182		}
5183
5184	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5185	<	extends Traverser<K,V,U> {
5184	>	@SuppressWarnings("serial")
5185	>	static final class MapReduceKeysTask<K,V,U>
5186	>	extends BulkTask<K,V,U> {
5187		final Fun<? super K, ? extends U> transformer;
5188		final BiFun<? super U, ? super U, ? extends U> reducer;
5189		U result;
5190		MapReduceKeysTask<K,V,U> rights, nextRight;
5191		MapReduceKeysTask
5192	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5192	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5193		MapReduceKeysTask<K,V,U> nextRight,
5194		Fun<? super K, ? extends U> transformer,
5195		BiFun<? super U, ? super U, ? extends U> reducer) {
5196	<	super(m, p, b); this.nextRight = nextRight;
5196	>	super(p, b, i, f, t); this.nextRight = nextRight;
5197		this.transformer = transformer;
5198		this.reducer = reducer;
5199		}
5200		public final U getRawResult() { return result; }
5201	<	@SuppressWarnings("unchecked") public final void compute() {
5201	>	public final void compute() {
5202		final Fun<? super K, ? extends U> transformer;
5203		final BiFun<? super U, ? super U, ? extends U> reducer;
5204		if ((transformer = this.transformer) != null &&
5205		(reducer = this.reducer) != null) {
5206	<	for (int b; (b = preSplit()) > 0;)
5206	>	for (int i = baseIndex, f, h; batch > 0 &&
5207	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5208	>	addToPendingCount(1);
5209		(rights = new MapReduceKeysTask<K,V,U>
5210	<	(map, this, b, rights, transformer, reducer)).fork();
5211	<	U r = null, u;
5212	<	while (advance() != null) {
5213	<	if ((u = transformer.apply((K)nextKey)) != null)
5210	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5211	>	rights, transformer, reducer)).fork();
5212	>	}
5213	>	U r = null;
5214	>	for (Node<K,V> p; (p = advance()) != null; ) {
5215	>	U u;
5216	>	if ((u = transformer.apply(p.key)) != null)
5217		r = (r == null) ? u : reducer.apply(r, u);
5218		}
5219		result = r;
5220		CountedCompleter<?> c;
5221		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5222	<	MapReduceKeysTask<K,V,U>
5222	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5223		t = (MapReduceKeysTask<K,V,U>)c,
5224		s = t.rights;
5225		while (s != null) {
#	Line 5753 | Line 5234 | public class ConcurrentHashMapV8<K, V>
5234		}
5235		}
5236
5237	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5238	<	extends Traverser<K,V,U> {
5237	>	@SuppressWarnings("serial")
5238	>	static final class MapReduceValuesTask<K,V,U>
5239	>	extends BulkTask<K,V,U> {
5240		final Fun<? super V, ? extends U> transformer;
5241		final BiFun<? super U, ? super U, ? extends U> reducer;
5242		U result;
5243		MapReduceValuesTask<K,V,U> rights, nextRight;
5244		MapReduceValuesTask
5245	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5245	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5246		MapReduceValuesTask<K,V,U> nextRight,
5247		Fun<? super V, ? extends U> transformer,
5248		BiFun<? super U, ? super U, ? extends U> reducer) {
5249	<	super(m, p, b); this.nextRight = nextRight;
5249	>	super(p, b, i, f, t); this.nextRight = nextRight;
5250		this.transformer = transformer;
5251		this.reducer = reducer;
5252		}
5253		public final U getRawResult() { return result; }
5254	<	@SuppressWarnings("unchecked") public final void compute() {
5254	>	public final void compute() {
5255		final Fun<? super V, ? extends U> transformer;
5256		final BiFun<? super U, ? super U, ? extends U> reducer;
5257		if ((transformer = this.transformer) != null &&
5258		(reducer = this.reducer) != null) {
5259	<	for (int b; (b = preSplit()) > 0;)
5259	>	for (int i = baseIndex, f, h; batch > 0 &&
5260	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5261	>	addToPendingCount(1);
5262		(rights = new MapReduceValuesTask<K,V,U>
5263	<	(map, this, b, rights, transformer, reducer)).fork();
5264	<	U r = null, u;
5265	<	Object v;
5266	<	while ((v = advance()) != null) {
5267	<	if ((u = transformer.apply((V)v)) != null)
5263	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5264	>	rights, transformer, reducer)).fork();
5265	>	}
5266	>	U r = null;
5267	>	for (Node<K,V> p; (p = advance()) != null; ) {
5268	>	U u;
5269	>	if ((u = transformer.apply(p.val)) != null)
5270		r = (r == null) ? u : reducer.apply(r, u);
5271		}
5272		result = r;
5273		CountedCompleter<?> c;
5274		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5275	<	MapReduceValuesTask<K,V,U>
5275	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5276		t = (MapReduceValuesTask<K,V,U>)c,
5277		s = t.rights;
5278		while (s != null) {
#	Line 5801 | Line 5287 | public class ConcurrentHashMapV8<K, V>
5287		}
5288		}
5289
5290	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5291	<	extends Traverser<K,V,U> {
5290	>	@SuppressWarnings("serial")
5291	>	static final class MapReduceEntriesTask<K,V,U>
5292	>	extends BulkTask<K,V,U> {
5293		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5294		final BiFun<? super U, ? super U, ? extends U> reducer;
5295		U result;
5296		MapReduceEntriesTask<K,V,U> rights, nextRight;
5297		MapReduceEntriesTask
5298	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5298	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5299		MapReduceEntriesTask<K,V,U> nextRight,
5300		Fun<Map.Entry<K,V>, ? extends U> transformer,
5301		BiFun<? super U, ? super U, ? extends U> reducer) {
5302	<	super(m, p, b); this.nextRight = nextRight;
5302	>	super(p, b, i, f, t); this.nextRight = nextRight;
5303		this.transformer = transformer;
5304		this.reducer = reducer;
5305		}
5306		public final U getRawResult() { return result; }
5307	<	@SuppressWarnings("unchecked") public final void compute() {
5307	>	public final void compute() {
5308		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5309		final BiFun<? super U, ? super U, ? extends U> reducer;
5310		if ((transformer = this.transformer) != null &&
5311		(reducer = this.reducer) != null) {
5312	<	for (int b; (b = preSplit()) > 0;)
5312	>	for (int i = baseIndex, f, h; batch > 0 &&
5313	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5314	>	addToPendingCount(1);
5315		(rights = new MapReduceEntriesTask<K,V,U>
5316	<	(map, this, b, rights, transformer, reducer)).fork();
5317	<	U r = null, u;
5318	<	Object v;
5319	<	while ((v = advance()) != null) {
5320	<	if ((u = transformer.apply(entryFor((K)nextKey,
5321	<	(V)v))) != null)
5316	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5317	>	rights, transformer, reducer)).fork();
5318	>	}
5319	>	U r = null;
5320	>	for (Node<K,V> p; (p = advance()) != null; ) {
5321	>	U u;
5322	>	if ((u = transformer.apply(p)) != null)
5323		r = (r == null) ? u : reducer.apply(r, u);
5324		}
5325		result = r;
5326		CountedCompleter<?> c;
5327		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5328	<	MapReduceEntriesTask<K,V,U>
5328	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5329		t = (MapReduceEntriesTask<K,V,U>)c,
5330		s = t.rights;
5331		while (s != null) {
#	Line 5850 | Line 5340 | public class ConcurrentHashMapV8<K, V>
5340		}
5341		}
5342
5343	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5344	<	extends Traverser<K,V,U> {
5343	>	@SuppressWarnings("serial")
5344	>	static final class MapReduceMappingsTask<K,V,U>
5345	>	extends BulkTask<K,V,U> {
5346		final BiFun<? super K, ? super V, ? extends U> transformer;
5347		final BiFun<? super U, ? super U, ? extends U> reducer;
5348		U result;
5349		MapReduceMappingsTask<K,V,U> rights, nextRight;
5350		MapReduceMappingsTask
5351	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5351	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5352		MapReduceMappingsTask<K,V,U> nextRight,
5353		BiFun<? super K, ? super V, ? extends U> transformer,
5354		BiFun<? super U, ? super U, ? extends U> reducer) {
5355	<	super(m, p, b); this.nextRight = nextRight;
5355	>	super(p, b, i, f, t); this.nextRight = nextRight;
5356		this.transformer = transformer;
5357		this.reducer = reducer;
5358		}
5359		public final U getRawResult() { return result; }
5360	<	@SuppressWarnings("unchecked") public final void compute() {
5360	>	public final void compute() {
5361		final BiFun<? super K, ? super V, ? extends U> transformer;
5362		final BiFun<? super U, ? super U, ? extends U> reducer;
5363		if ((transformer = this.transformer) != null &&
5364		(reducer = this.reducer) != null) {
5365	<	for (int b; (b = preSplit()) > 0;)
5365	>	for (int i = baseIndex, f, h; batch > 0 &&
5366	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5367	>	addToPendingCount(1);
5368		(rights = new MapReduceMappingsTask<K,V,U>
5369	<	(map, this, b, rights, transformer, reducer)).fork();
5370	<	U r = null, u;
5371	<	Object v;
5372	<	while ((v = advance()) != null) {
5373	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5369	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5370	>	rights, transformer, reducer)).fork();
5371	>	}
5372	>	U r = null;
5373	>	for (Node<K,V> p; (p = advance()) != null; ) {
5374	>	U u;
5375	>	if ((u = transformer.apply(p.key, p.val)) != null)
5376		r = (r == null) ? u : reducer.apply(r, u);
5377		}
5378		result = r;
5379		CountedCompleter<?> c;
5380		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5381	<	MapReduceMappingsTask<K,V,U>
5381	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5382		t = (MapReduceMappingsTask<K,V,U>)c,
5383		s = t.rights;
5384		while (s != null) {
#	Line 5898 | Line 5393 | public class ConcurrentHashMapV8<K, V>
5393		}
5394		}
5395
5396	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5397	<	extends Traverser<K,V,Double> {
5396	>	@SuppressWarnings("serial")
5397	>	static final class MapReduceKeysToDoubleTask<K,V>
5398	>	extends BulkTask<K,V,Double> {
5399		final ObjectToDouble<? super K> transformer;
5400		final DoubleByDoubleToDouble reducer;
5401		final double basis;
5402		double result;
5403		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5404		MapReduceKeysToDoubleTask
5405	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5405	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5406		MapReduceKeysToDoubleTask<K,V> nextRight,
5407		ObjectToDouble<? super K> transformer,
5408		double basis,
5409		DoubleByDoubleToDouble reducer) {
5410	<	super(m, p, b); this.nextRight = nextRight;
5410	>	super(p, b, i, f, t); this.nextRight = nextRight;
5411		this.transformer = transformer;
5412		this.basis = basis; this.reducer = reducer;
5413		}
5414		public final Double getRawResult() { return result; }
5415	<	@SuppressWarnings("unchecked") public final void compute() {
5415	>	public final void compute() {
5416		final ObjectToDouble<? super K> transformer;
5417		final DoubleByDoubleToDouble reducer;
5418		if ((transformer = this.transformer) != null &&
5419		(reducer = this.reducer) != null) {
5420		double r = this.basis;
5421	<	for (int b; (b = preSplit()) > 0;)
5421	>	for (int i = baseIndex, f, h; batch > 0 &&
5422	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5423	>	addToPendingCount(1);
5424		(rights = new MapReduceKeysToDoubleTask<K,V>
5425	<	(map, this, b, rights, transformer, r, reducer)).fork();
5426	<	while (advance() != null)
5427	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5425	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5426	>	rights, transformer, r, reducer)).fork();
5427	>	}
5428	>	for (Node<K,V> p; (p = advance()) != null; )
5429	>	r = reducer.apply(r, transformer.apply(p.key));
5430		result = r;
5431		CountedCompleter<?> c;
5432		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5433	<	MapReduceKeysToDoubleTask<K,V>
5433	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5434		t = (MapReduceKeysToDoubleTask<K,V>)c,
5435		s = t.rights;
5436		while (s != null) {
#	Line 5942 | Line 5442 | public class ConcurrentHashMapV8<K, V>
5442		}
5443		}
5444
5445	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5446	<	extends Traverser<K,V,Double> {
5445	>	@SuppressWarnings("serial")
5446	>	static final class MapReduceValuesToDoubleTask<K,V>
5447	>	extends BulkTask<K,V,Double> {
5448		final ObjectToDouble<? super V> transformer;
5449		final DoubleByDoubleToDouble reducer;
5450		final double basis;
5451		double result;
5452		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5453		MapReduceValuesToDoubleTask
5454	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5454	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5455		MapReduceValuesToDoubleTask<K,V> nextRight,
5456		ObjectToDouble<? super V> transformer,
5457		double basis,
5458		DoubleByDoubleToDouble reducer) {
5459	<	super(m, p, b); this.nextRight = nextRight;
5459	>	super(p, b, i, f, t); this.nextRight = nextRight;
5460		this.transformer = transformer;
5461		this.basis = basis; this.reducer = reducer;
5462		}
5463		public final Double getRawResult() { return result; }
5464	<	@SuppressWarnings("unchecked") public final void compute() {
5464	>	public final void compute() {
5465		final ObjectToDouble<? super V> transformer;
5466		final DoubleByDoubleToDouble reducer;
5467		if ((transformer = this.transformer) != null &&
5468		(reducer = this.reducer) != null) {
5469		double r = this.basis;
5470	<	for (int b; (b = preSplit()) > 0;)
5470	>	for (int i = baseIndex, f, h; batch > 0 &&
5471	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5472	>	addToPendingCount(1);
5473		(rights = new MapReduceValuesToDoubleTask<K,V>
5474	<	(map, this, b, rights, transformer, r, reducer)).fork();
5475	<	Object v;
5476	<	while ((v = advance()) != null)
5477	<	r = reducer.apply(r, transformer.apply((V)v));
5474	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5475	>	rights, transformer, r, reducer)).fork();
5476	>	}
5477	>	for (Node<K,V> p; (p = advance()) != null; )
5478	>	r = reducer.apply(r, transformer.apply(p.val));
5479		result = r;
5480		CountedCompleter<?> c;
5481		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5482	<	MapReduceValuesToDoubleTask<K,V>
5482	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5483		t = (MapReduceValuesToDoubleTask<K,V>)c,
5484		s = t.rights;
5485		while (s != null) {
#	Line 5987 | Line 5491 | public class ConcurrentHashMapV8<K, V>
5491		}
5492		}
5493
5494	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5495	<	extends Traverser<K,V,Double> {
5494	>	@SuppressWarnings("serial")
5495	>	static final class MapReduceEntriesToDoubleTask<K,V>
5496	>	extends BulkTask<K,V,Double> {
5497		final ObjectToDouble<Map.Entry<K,V>> transformer;
5498		final DoubleByDoubleToDouble reducer;
5499		final double basis;
5500		double result;
5501		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5502		MapReduceEntriesToDoubleTask
5503	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5503	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5504		MapReduceEntriesToDoubleTask<K,V> nextRight,
5505		ObjectToDouble<Map.Entry<K,V>> transformer,
5506		double basis,
5507		DoubleByDoubleToDouble reducer) {
5508	<	super(m, p, b); this.nextRight = nextRight;
5508	>	super(p, b, i, f, t); this.nextRight = nextRight;
5509		this.transformer = transformer;
5510		this.basis = basis; this.reducer = reducer;
5511		}
5512		public final Double getRawResult() { return result; }
5513	<	@SuppressWarnings("unchecked") public final void compute() {
5513	>	public final void compute() {
5514		final ObjectToDouble<Map.Entry<K,V>> transformer;
5515		final DoubleByDoubleToDouble reducer;
5516		if ((transformer = this.transformer) != null &&
5517		(reducer = this.reducer) != null) {
5518		double r = this.basis;
5519	<	for (int b; (b = preSplit()) > 0;)
5519	>	for (int i = baseIndex, f, h; batch > 0 &&
5520	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5521	>	addToPendingCount(1);
5522		(rights = new MapReduceEntriesToDoubleTask<K,V>
5523	<	(map, this, b, rights, transformer, r, reducer)).fork();
5524	<	Object v;
5525	<	while ((v = advance()) != null)
5526	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
5527	<	(V)v)));
5523	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5524	>	rights, transformer, r, reducer)).fork();
5525	>	}
5526	>	for (Node<K,V> p; (p = advance()) != null; )
5527	>	r = reducer.apply(r, transformer.apply(p));
5528		result = r;
5529		CountedCompleter<?> c;
5530		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5531	<	MapReduceEntriesToDoubleTask<K,V>
5531	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5532		t = (MapReduceEntriesToDoubleTask<K,V>)c,
5533		s = t.rights;
5534		while (s != null) {
#	Line 6033 | Line 5540 | public class ConcurrentHashMapV8<K, V>
5540		}
5541		}
5542
5543	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5544	<	extends Traverser<K,V,Double> {
5543	>	@SuppressWarnings("serial")
5544	>	static final class MapReduceMappingsToDoubleTask<K,V>
5545	>	extends BulkTask<K,V,Double> {
5546		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5547		final DoubleByDoubleToDouble reducer;
5548		final double basis;
5549		double result;
5550		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5551		MapReduceMappingsToDoubleTask
5552	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5552	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5553		MapReduceMappingsToDoubleTask<K,V> nextRight,
5554		ObjectByObjectToDouble<? super K, ? super V> transformer,
5555		double basis,
5556		DoubleByDoubleToDouble reducer) {
5557	<	super(m, p, b); this.nextRight = nextRight;
5557	>	super(p, b, i, f, t); this.nextRight = nextRight;
5558		this.transformer = transformer;
5559		this.basis = basis; this.reducer = reducer;
5560		}
5561		public final Double getRawResult() { return result; }
5562	<	@SuppressWarnings("unchecked") public final void compute() {
5562	>	public final void compute() {
5563		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5564		final DoubleByDoubleToDouble reducer;
5565		if ((transformer = this.transformer) != null &&
5566		(reducer = this.reducer) != null) {
5567		double r = this.basis;
5568	<	for (int b; (b = preSplit()) > 0;)
5568	>	for (int i = baseIndex, f, h; batch > 0 &&
5569	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5570	>	addToPendingCount(1);
5571		(rights = new MapReduceMappingsToDoubleTask<K,V>
5572	<	(map, this, b, rights, transformer, r, reducer)).fork();
5573	<	Object v;
5574	<	while ((v = advance()) != null)
5575	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5572	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5573	>	rights, transformer, r, reducer)).fork();
5574	>	}
5575	>	for (Node<K,V> p; (p = advance()) != null; )
5576	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5577		result = r;
5578		CountedCompleter<?> c;
5579		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5580	<	MapReduceMappingsToDoubleTask<K,V>
5580	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5581		t = (MapReduceMappingsToDoubleTask<K,V>)c,
5582		s = t.rights;
5583		while (s != null) {
#	Line 6078 | Line 5589 | public class ConcurrentHashMapV8<K, V>
5589		}
5590		}
5591
5592	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5593	<	extends Traverser<K,V,Long> {
5592	>	@SuppressWarnings("serial")
5593	>	static final class MapReduceKeysToLongTask<K,V>
5594	>	extends BulkTask<K,V,Long> {
5595		final ObjectToLong<? super K> transformer;
5596		final LongByLongToLong reducer;
5597		final long basis;
5598		long result;
5599		MapReduceKeysToLongTask<K,V> rights, nextRight;
5600		MapReduceKeysToLongTask
5601	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5601	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5602		MapReduceKeysToLongTask<K,V> nextRight,
5603		ObjectToLong<? super K> transformer,
5604		long basis,
5605		LongByLongToLong reducer) {
5606	<	super(m, p, b); this.nextRight = nextRight;
5606	>	super(p, b, i, f, t); this.nextRight = nextRight;
5607		this.transformer = transformer;
5608		this.basis = basis; this.reducer = reducer;
5609		}
5610		public final Long getRawResult() { return result; }
5611	<	@SuppressWarnings("unchecked") public final void compute() {
5611	>	public final void compute() {
5612		final ObjectToLong<? super K> transformer;
5613		final LongByLongToLong reducer;
5614		if ((transformer = this.transformer) != null &&
5615		(reducer = this.reducer) != null) {
5616		long r = this.basis;
5617	<	for (int b; (b = preSplit()) > 0;)
5617	>	for (int i = baseIndex, f, h; batch > 0 &&
5618	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5619	>	addToPendingCount(1);
5620		(rights = new MapReduceKeysToLongTask<K,V>
5621	<	(map, this, b, rights, transformer, r, reducer)).fork();
5622	<	while (advance() != null)
5623	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5621	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5622	>	rights, transformer, r, reducer)).fork();
5623	>	}
5624	>	for (Node<K,V> p; (p = advance()) != null; )
5625	>	r = reducer.apply(r, transformer.apply(p.key));
5626		result = r;
5627		CountedCompleter<?> c;
5628		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5629	<	MapReduceKeysToLongTask<K,V>
5629	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5630		t = (MapReduceKeysToLongTask<K,V>)c,
5631		s = t.rights;
5632		while (s != null) {
#	Line 6122 | Line 5638 | public class ConcurrentHashMapV8<K, V>
5638		}
5639		}
5640
5641	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5642	<	extends Traverser<K,V,Long> {
5641	>	@SuppressWarnings("serial")
5642	>	static final class MapReduceValuesToLongTask<K,V>
5643	>	extends BulkTask<K,V,Long> {
5644		final ObjectToLong<? super V> transformer;
5645		final LongByLongToLong reducer;
5646		final long basis;
5647		long result;
5648		MapReduceValuesToLongTask<K,V> rights, nextRight;
5649		MapReduceValuesToLongTask
5650	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5650	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5651		MapReduceValuesToLongTask<K,V> nextRight,
5652		ObjectToLong<? super V> transformer,
5653		long basis,
5654		LongByLongToLong reducer) {
5655	<	super(m, p, b); this.nextRight = nextRight;
5655	>	super(p, b, i, f, t); this.nextRight = nextRight;
5656		this.transformer = transformer;
5657		this.basis = basis; this.reducer = reducer;
5658		}
5659		public final Long getRawResult() { return result; }
5660	<	@SuppressWarnings("unchecked") public final void compute() {
5660	>	public final void compute() {
5661		final ObjectToLong<? super V> transformer;
5662		final LongByLongToLong reducer;
5663		if ((transformer = this.transformer) != null &&
5664		(reducer = this.reducer) != null) {
5665		long r = this.basis;
5666	<	for (int b; (b = preSplit()) > 0;)
5666	>	for (int i = baseIndex, f, h; batch > 0 &&
5667	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5668	>	addToPendingCount(1);
5669		(rights = new MapReduceValuesToLongTask<K,V>
5670	<	(map, this, b, rights, transformer, r, reducer)).fork();
5671	<	Object v;
5672	<	while ((v = advance()) != null)
5673	<	r = reducer.apply(r, transformer.apply((V)v));
5670	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5671	>	rights, transformer, r, reducer)).fork();
5672	>	}
5673	>	for (Node<K,V> p; (p = advance()) != null; )
5674	>	r = reducer.apply(r, transformer.apply(p.val));
5675		result = r;
5676		CountedCompleter<?> c;
5677		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5678	<	MapReduceValuesToLongTask<K,V>
5678	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5679		t = (MapReduceValuesToLongTask<K,V>)c,
5680		s = t.rights;
5681		while (s != null) {
#	Line 6167 | Line 5687 | public class ConcurrentHashMapV8<K, V>
5687		}
5688		}
5689
5690	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5691	<	extends Traverser<K,V,Long> {
5690	>	@SuppressWarnings("serial")
5691	>	static final class MapReduceEntriesToLongTask<K,V>
5692	>	extends BulkTask<K,V,Long> {
5693		final ObjectToLong<Map.Entry<K,V>> transformer;
5694		final LongByLongToLong reducer;
5695		final long basis;
5696		long result;
5697		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5698		MapReduceEntriesToLongTask
5699	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5699	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5700		MapReduceEntriesToLongTask<K,V> nextRight,
5701		ObjectToLong<Map.Entry<K,V>> transformer,
5702		long basis,
5703		LongByLongToLong reducer) {
5704	<	super(m, p, b); this.nextRight = nextRight;
5704	>	super(p, b, i, f, t); this.nextRight = nextRight;
5705		this.transformer = transformer;
5706		this.basis = basis; this.reducer = reducer;
5707		}
5708		public final Long getRawResult() { return result; }
5709	<	@SuppressWarnings("unchecked") public final void compute() {
5709	>	public final void compute() {
5710		final ObjectToLong<Map.Entry<K,V>> transformer;
5711		final LongByLongToLong reducer;
5712		if ((transformer = this.transformer) != null &&
5713		(reducer = this.reducer) != null) {
5714		long r = this.basis;
5715	<	for (int b; (b = preSplit()) > 0;)
5715	>	for (int i = baseIndex, f, h; batch > 0 &&
5716	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5717	>	addToPendingCount(1);
5718		(rights = new MapReduceEntriesToLongTask<K,V>
5719	<	(map, this, b, rights, transformer, r, reducer)).fork();
5720	<	Object v;
5721	<	while ((v = advance()) != null)
5722	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
5723	<	(V)v)));
5719	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5720	>	rights, transformer, r, reducer)).fork();
5721	>	}
5722	>	for (Node<K,V> p; (p = advance()) != null; )
5723	>	r = reducer.apply(r, transformer.apply(p));
5724		result = r;
5725		CountedCompleter<?> c;
5726		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5727	<	MapReduceEntriesToLongTask<K,V>
5727	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5728		t = (MapReduceEntriesToLongTask<K,V>)c,
5729		s = t.rights;
5730		while (s != null) {
#	Line 6213 | Line 5736 | public class ConcurrentHashMapV8<K, V>
5736		}
5737		}
5738
5739	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5740	<	extends Traverser<K,V,Long> {
5739	>	@SuppressWarnings("serial")
5740	>	static final class MapReduceMappingsToLongTask<K,V>
5741	>	extends BulkTask<K,V,Long> {
5742		final ObjectByObjectToLong<? super K, ? super V> transformer;
5743		final LongByLongToLong reducer;
5744		final long basis;
5745		long result;
5746		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5747		MapReduceMappingsToLongTask
5748	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5748	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5749		MapReduceMappingsToLongTask<K,V> nextRight,
5750		ObjectByObjectToLong<? super K, ? super V> transformer,
5751		long basis,
5752		LongByLongToLong reducer) {
5753	<	super(m, p, b); this.nextRight = nextRight;
5753	>	super(p, b, i, f, t); this.nextRight = nextRight;
5754		this.transformer = transformer;
5755		this.basis = basis; this.reducer = reducer;
5756		}
5757		public final Long getRawResult() { return result; }
5758	<	@SuppressWarnings("unchecked") public final void compute() {
5758	>	public final void compute() {
5759		final ObjectByObjectToLong<? super K, ? super V> transformer;
5760		final LongByLongToLong reducer;
5761		if ((transformer = this.transformer) != null &&
5762		(reducer = this.reducer) != null) {
5763		long r = this.basis;
5764	<	for (int b; (b = preSplit()) > 0;)
5764	>	for (int i = baseIndex, f, h; batch > 0 &&
5765	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5766	>	addToPendingCount(1);
5767		(rights = new MapReduceMappingsToLongTask<K,V>
5768	<	(map, this, b, rights, transformer, r, reducer)).fork();
5769	<	Object v;
5770	<	while ((v = advance()) != null)
5771	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5768	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5769	>	rights, transformer, r, reducer)).fork();
5770	>	}
5771	>	for (Node<K,V> p; (p = advance()) != null; )
5772	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5773		result = r;
5774		CountedCompleter<?> c;
5775		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5776	<	MapReduceMappingsToLongTask<K,V>
5776	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5777		t = (MapReduceMappingsToLongTask<K,V>)c,
5778		s = t.rights;
5779		while (s != null) {
#	Line 6258 | Line 5785 | public class ConcurrentHashMapV8<K, V>
5785		}
5786		}
5787
5788	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5789	<	extends Traverser<K,V,Integer> {
5788	>	@SuppressWarnings("serial")
5789	>	static final class MapReduceKeysToIntTask<K,V>
5790	>	extends BulkTask<K,V,Integer> {
5791		final ObjectToInt<? super K> transformer;
5792		final IntByIntToInt reducer;
5793		final int basis;
5794		int result;
5795		MapReduceKeysToIntTask<K,V> rights, nextRight;
5796		MapReduceKeysToIntTask
5797	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5797	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5798		MapReduceKeysToIntTask<K,V> nextRight,
5799		ObjectToInt<? super K> transformer,
5800		int basis,
5801		IntByIntToInt reducer) {
5802	<	super(m, p, b); this.nextRight = nextRight;
5802	>	super(p, b, i, f, t); this.nextRight = nextRight;
5803		this.transformer = transformer;
5804		this.basis = basis; this.reducer = reducer;
5805		}
5806		public final Integer getRawResult() { return result; }
5807	<	@SuppressWarnings("unchecked") public final void compute() {
5807	>	public final void compute() {
5808		final ObjectToInt<? super K> transformer;
5809		final IntByIntToInt reducer;
5810		if ((transformer = this.transformer) != null &&
5811		(reducer = this.reducer) != null) {
5812		int r = this.basis;
5813	<	for (int b; (b = preSplit()) > 0;)
5813	>	for (int i = baseIndex, f, h; batch > 0 &&
5814	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5815	>	addToPendingCount(1);
5816		(rights = new MapReduceKeysToIntTask<K,V>
5817	<	(map, this, b, rights, transformer, r, reducer)).fork();
5818	<	while (advance() != null)
5819	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5817	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5818	>	rights, transformer, r, reducer)).fork();
5819	>	}
5820	>	for (Node<K,V> p; (p = advance()) != null; )
5821	>	r = reducer.apply(r, transformer.apply(p.key));
5822		result = r;
5823		CountedCompleter<?> c;
5824		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5825	<	MapReduceKeysToIntTask<K,V>
5825	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5826		t = (MapReduceKeysToIntTask<K,V>)c,
5827		s = t.rights;
5828		while (s != null) {
#	Line 6302 | Line 5834 | public class ConcurrentHashMapV8<K, V>
5834		}
5835		}
5836
5837	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5838	<	extends Traverser<K,V,Integer> {
5837	>	@SuppressWarnings("serial")
5838	>	static final class MapReduceValuesToIntTask<K,V>
5839	>	extends BulkTask<K,V,Integer> {
5840		final ObjectToInt<? super V> transformer;
5841		final IntByIntToInt reducer;
5842		final int basis;
5843		int result;
5844		MapReduceValuesToIntTask<K,V> rights, nextRight;
5845		MapReduceValuesToIntTask
5846	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5846	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5847		MapReduceValuesToIntTask<K,V> nextRight,
5848		ObjectToInt<? super V> transformer,
5849		int basis,
5850		IntByIntToInt reducer) {
5851	<	super(m, p, b); this.nextRight = nextRight;
5851	>	super(p, b, i, f, t); this.nextRight = nextRight;
5852		this.transformer = transformer;
5853		this.basis = basis; this.reducer = reducer;
5854		}
5855		public final Integer getRawResult() { return result; }
5856	<	@SuppressWarnings("unchecked") public final void compute() {
5856	>	public final void compute() {
5857		final ObjectToInt<? super V> transformer;
5858		final IntByIntToInt reducer;
5859		if ((transformer = this.transformer) != null &&
5860		(reducer = this.reducer) != null) {
5861		int r = this.basis;
5862	<	for (int b; (b = preSplit()) > 0;)
5862	>	for (int i = baseIndex, f, h; batch > 0 &&
5863	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5864	>	addToPendingCount(1);
5865		(rights = new MapReduceValuesToIntTask<K,V>
5866	<	(map, this, b, rights, transformer, r, reducer)).fork();
5867	<	Object v;
5868	<	while ((v = advance()) != null)
5869	<	r = reducer.apply(r, transformer.apply((V)v));
5866	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5867	>	rights, transformer, r, reducer)).fork();
5868	>	}
5869	>	for (Node<K,V> p; (p = advance()) != null; )
5870	>	r = reducer.apply(r, transformer.apply(p.val));
5871		result = r;
5872		CountedCompleter<?> c;
5873		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5874	<	MapReduceValuesToIntTask<K,V>
5874	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5875		t = (MapReduceValuesToIntTask<K,V>)c,
5876		s = t.rights;
5877		while (s != null) {
#	Line 6347 | Line 5883 | public class ConcurrentHashMapV8<K, V>
5883		}
5884		}
5885
5886	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
5887	<	extends Traverser<K,V,Integer> {
5886	>	@SuppressWarnings("serial")
5887	>	static final class MapReduceEntriesToIntTask<K,V>
5888	>	extends BulkTask<K,V,Integer> {
5889		final ObjectToInt<Map.Entry<K,V>> transformer;
5890		final IntByIntToInt reducer;
5891		final int basis;
5892		int result;
5893		MapReduceEntriesToIntTask<K,V> rights, nextRight;
5894		MapReduceEntriesToIntTask
5895	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5895	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5896		MapReduceEntriesToIntTask<K,V> nextRight,
5897		ObjectToInt<Map.Entry<K,V>> transformer,
5898		int basis,
5899		IntByIntToInt reducer) {
5900	<	super(m, p, b); this.nextRight = nextRight;
5900	>	super(p, b, i, f, t); this.nextRight = nextRight;
5901		this.transformer = transformer;
5902		this.basis = basis; this.reducer = reducer;
5903		}
5904		public final Integer getRawResult() { return result; }
5905	<	@SuppressWarnings("unchecked") public final void compute() {
5905	>	public final void compute() {
5906		final ObjectToInt<Map.Entry<K,V>> transformer;
5907		final IntByIntToInt reducer;
5908		if ((transformer = this.transformer) != null &&
5909		(reducer = this.reducer) != null) {
5910		int r = this.basis;
5911	<	for (int b; (b = preSplit()) > 0;)
5911	>	for (int i = baseIndex, f, h; batch > 0 &&
5912	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5913	>	addToPendingCount(1);
5914		(rights = new MapReduceEntriesToIntTask<K,V>
5915	<	(map, this, b, rights, transformer, r, reducer)).fork();
5916	<	Object v;
5917	<	while ((v = advance()) != null)
5918	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
5919	<	(V)v)));
5915	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5916	>	rights, transformer, r, reducer)).fork();
5917	>	}
5918	>	for (Node<K,V> p; (p = advance()) != null; )
5919	>	r = reducer.apply(r, transformer.apply(p));
5920		result = r;
5921		CountedCompleter<?> c;
5922		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5923	<	MapReduceEntriesToIntTask<K,V>
5923	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
5924		t = (MapReduceEntriesToIntTask<K,V>)c,
5925		s = t.rights;
5926		while (s != null) {
#	Line 6393 | Line 5932 | public class ConcurrentHashMapV8<K, V>
5932		}
5933		}
5934
5935	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
5936	<	extends Traverser<K,V,Integer> {
5935	>	@SuppressWarnings("serial")
5936	>	static final class MapReduceMappingsToIntTask<K,V>
5937	>	extends BulkTask<K,V,Integer> {
5938		final ObjectByObjectToInt<? super K, ? super V> transformer;
5939		final IntByIntToInt reducer;
5940		final int basis;
5941		int result;
5942		MapReduceMappingsToIntTask<K,V> rights, nextRight;
5943		MapReduceMappingsToIntTask
5944	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5944	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5945		MapReduceMappingsToIntTask<K,V> nextRight,
5946		ObjectByObjectToInt<? super K, ? super V> transformer,
5947		int basis,
5948		IntByIntToInt reducer) {
5949	<	super(m, p, b); this.nextRight = nextRight;
5949	>	super(p, b, i, f, t); this.nextRight = nextRight;
5950		this.transformer = transformer;
5951		this.basis = basis; this.reducer = reducer;
5952		}
5953		public final Integer getRawResult() { return result; }
5954	<	@SuppressWarnings("unchecked") public final void compute() {
5954	>	public final void compute() {
5955		final ObjectByObjectToInt<? super K, ? super V> transformer;
5956		final IntByIntToInt reducer;
5957		if ((transformer = this.transformer) != null &&
5958		(reducer = this.reducer) != null) {
5959		int r = this.basis;
5960	<	for (int b; (b = preSplit()) > 0;)
5960	>	for (int i = baseIndex, f, h; batch > 0 &&
5961	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5962	>	addToPendingCount(1);
5963		(rights = new MapReduceMappingsToIntTask<K,V>
5964	<	(map, this, b, rights, transformer, r, reducer)).fork();
5965	<	Object v;
5966	<	while ((v = advance()) != null)
5967	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5964	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5965	>	rights, transformer, r, reducer)).fork();
5966	>	}
5967	>	for (Node<K,V> p; (p = advance()) != null; )
5968	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5969		result = r;
5970		CountedCompleter<?> c;
5971		for (c = firstComplete(); c != null; c = c.nextComplete()) {
5972	<	MapReduceMappingsToIntTask<K,V>
5972	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
5973		t = (MapReduceMappingsToIntTask<K,V>)c,
5974		s = t.rights;
5975		while (s != null) {
#	Line 6438 | Line 5981 | public class ConcurrentHashMapV8<K, V>
5981		}
5982		}
5983
5984	+	/* ---------------- Counters -------------- */
5985	+
5986	+	// Adapted from LongAdder and Striped64.
5987	+	// See their internal docs for explanation.
5988	+
5989	+	// A padded cell for distributing counts
5990	+	static final class CounterCell {
5991	+	volatile long p0, p1, p2, p3, p4, p5, p6;
5992	+	volatile long value;
5993	+	volatile long q0, q1, q2, q3, q4, q5, q6;
5994	+	CounterCell(long x) { value = x; }
5995	+	}
5996	+
5997	+	/**
5998	+	* Holder for the thread-local hash code determining which
5999	+	* CounterCell to use. The code is initialized via the
6000	+	* counterHashCodeGenerator, but may be moved upon collisions.
6001	+	*/
6002	+	static final class CounterHashCode {
6003	+	int code;
6004	+	}
6005	+
6006	+	/**
6007	+	* Generates initial value for per-thread CounterHashCodes.
6008	+	*/
6009	+	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
6010	+
6011	+	/**
6012	+	* Increment for counterHashCodeGenerator. See class ThreadLocal
6013	+	* for explanation.
6014	+	*/
6015	+	static final int SEED_INCREMENT = 0x61c88647;
6016	+
6017	+	/**
6018	+	* Per-thread counter hash codes. Shared across all instances.
6019	+	*/
6020	+	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
6021	+	new ThreadLocal<CounterHashCode>();
6022	+
6023	+
6024	+	final long sumCount() {
6025	+	CounterCell[] as = counterCells; CounterCell a;
6026	+	long sum = baseCount;
6027	+	if (as != null) {
6028	+	for (int i = 0; i < as.length; ++i) {
6029	+	if ((a = as[i]) != null)
6030	+	sum += a.value;
6031	+	}
6032	+	}
6033	+	return sum;
6034	+	}
6035	+
6036	+	// See LongAdder version for explanation
6037	+	private final void fullAddCount(long x, CounterHashCode hc,
6038	+	boolean wasUncontended) {
6039	+	int h;
6040	+	if (hc == null) {
6041	+	hc = new CounterHashCode();
6042	+	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
6043	+	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
6044	+	threadCounterHashCode.set(hc);
6045	+	}
6046	+	else
6047	+	h = hc.code;
6048	+	boolean collide = false;                // True if last slot nonempty
6049	+	for (;;) {
6050	+	CounterCell[] as; CounterCell a; int n; long v;
6051	+	if ((as = counterCells) != null && (n = as.length) > 0) {
6052	+	if ((a = as[(n - 1) & h]) == null) {
6053	+	if (cellsBusy == 0) {            // Try to attach new Cell
6054	+	CounterCell r = new CounterCell(x); // Optimistic create
6055	+	if (cellsBusy == 0 &&
6056	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6057	+	boolean created = false;
6058	+	try {               // Recheck under lock
6059	+	CounterCell[] rs; int m, j;
6060	+	if ((rs = counterCells) != null &&
6061	+	(m = rs.length) > 0 &&
6062	+	rs[j = (m - 1) & h] == null) {
6063	+	rs[j] = r;
6064	+	created = true;
6065	+	}
6066	+	} finally {
6067	+	cellsBusy = 0;
6068	+	}
6069	+	if (created)
6070	+	break;
6071	+	continue;           // Slot is now non-empty
6072	+	}
6073	+	}
6074	+	collide = false;
6075	+	}
6076	+	else if (!wasUncontended)       // CAS already known to fail
6077	+	wasUncontended = true;      // Continue after rehash
6078	+	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
6079	+	break;
6080	+	else if (counterCells != as || n >= NCPU)
6081	+	collide = false;            // At max size or stale
6082	+	else if (!collide)
6083	+	collide = true;
6084	+	else if (cellsBusy == 0 &&
6085	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6086	+	try {
6087	+	if (counterCells == as) {// Expand table unless stale
6088	+	CounterCell[] rs = new CounterCell[n << 1];
6089	+	for (int i = 0; i < n; ++i)
6090	+	rs[i] = as[i];
6091	+	counterCells = rs;
6092	+	}
6093	+	} finally {
6094	+	cellsBusy = 0;
6095	+	}
6096	+	collide = false;
6097	+	continue;                   // Retry with expanded table
6098	+	}
6099	+	h ^= h << 13;                   // Rehash
6100	+	h ^= h >>> 17;
6101	+	h ^= h << 5;
6102	+	}
6103	+	else if (cellsBusy == 0 && counterCells == as &&
6104	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6105	+	boolean init = false;
6106	+	try {                           // Initialize table
6107	+	if (counterCells == as) {
6108	+	CounterCell[] rs = new CounterCell[2];
6109	+	rs[h & 1] = new CounterCell(x);
6110	+	counterCells = rs;
6111	+	init = true;
6112	+	}
6113	+	} finally {
6114	+	cellsBusy = 0;
6115	+	}
6116	+	if (init)
6117	+	break;
6118	+	}
6119	+	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
6120	+	break;                          // Fall back on using base
6121	+	}
6122	+	hc.code = h;                            // Record index for next time
6123	+	}
6124	+
6125		// Unsafe mechanics
6126		private static final sun.misc.Unsafe U;
6127		private static final long SIZECTL;
6128		private static final long TRANSFERINDEX;
6129		private static final long TRANSFERORIGIN;
6130		private static final long BASECOUNT;
6131	<	private static final long COUNTERBUSY;
6131	>	private static final long CELLSBUSY;
6132		private static final long CELLVALUE;
6133		private static final long ABASE;
6134		private static final int ASHIFT;
6135
6136		static {
6453	–	int ss;
6137		try {
6138		U = getUnsafe();
6139		Class<?> k = ConcurrentHashMapV8.class;
#	Line 6462 | Line 6145 | public class ConcurrentHashMapV8<K, V>
6145		(k.getDeclaredField("transferOrigin"));
6146		BASECOUNT = U.objectFieldOffset
6147		(k.getDeclaredField("baseCount"));
6148	<	COUNTERBUSY = U.objectFieldOffset
6149	<	(k.getDeclaredField("counterBusy"));
6148	>	CELLSBUSY = U.objectFieldOffset
6149	>	(k.getDeclaredField("cellsBusy"));
6150		Class<?> ck = CounterCell.class;
6151		CELLVALUE = U.objectFieldOffset
6152		(ck.getDeclaredField("value"));
6153	<	Class<?> sc = Node[].class;
6154	<	ABASE = U.arrayBaseOffset(sc);
6155	<	ss = U.arrayIndexScale(sc);
6156	<	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6153	>	Class<?> ak = Node[].class;
6154	>	ABASE = U.arrayBaseOffset(ak);
6155	>	int scale = U.arrayIndexScale(ak);
6156	>	if ((scale & (scale - 1)) != 0)
6157	>	throw new Error("data type scale not a power of two");
6158	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6159		} catch (Exception e) {
6160		throw new Error(e);
6161		}
6477	–	if ((ss & (ss-1)) != 0)
6478	–	throw new Error("data type scale not a power of two");
6162		}
6163
6164		/**
#	Line 6488 | Line 6171 | public class ConcurrentHashMapV8<K, V>
6171		private static sun.misc.Unsafe getUnsafe() {
6172		try {
6173		return sun.misc.Unsafe.getUnsafe();
6174	<	} catch (SecurityException se) {
6175	<	try {
6176	<	return java.security.AccessController.doPrivileged
6177	<	(new java.security
6178	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6179	<	public sun.misc.Unsafe run() throws Exception {
6180	<	java.lang.reflect.Field f = sun.misc
6181	<	.Unsafe.class.getDeclaredField("theUnsafe");
6182	<	f.setAccessible(true);
6183	<	return (sun.misc.Unsafe) f.get(null);
6184	<	}});
6185	<	} catch (java.security.PrivilegedActionException e) {
6186	<	throw new RuntimeException("Could not initialize intrinsics",
6187	<	e.getCause());
6188	<	}
6174	>	} catch (SecurityException tryReflectionInstead) {}
6175	>	try {
6176	>	return java.security.AccessController.doPrivileged
6177	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6178	>	public sun.misc.Unsafe run() throws Exception {
6179	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6180	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6181	>	f.setAccessible(true);
6182	>	Object x = f.get(null);
6183	>	if (k.isInstance(x))
6184	>	return k.cast(x);
6185	>	}
6186	>	throw new NoSuchFieldError("the Unsafe");
6187	>	}});
6188	>	} catch (java.security.PrivilegedActionException e) {
6189	>	throw new RuntimeException("Could not initialize intrinsics",
6190	>	e.getCause());
6191		}
6192		}
6193		}

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