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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.80 by jsr166, Sat Nov 24 03:46:28 2012 UTC vs.
Revision 1.116 by dl, Wed Sep 11 14:53:38 2013 UTC

#	Line 6 | Line 6
6
7		package jsr166e;
8
9	<	import java.util.Comparator;
10	<	import java.util.Arrays;
11	<	import java.util.Map;
12	<	import java.util.Set;
13	<	import java.util.Collection;
14	<	import java.util.AbstractMap;
15	<	import java.util.AbstractSet;
16	<	import java.util.AbstractCollection;
17	<	import java.util.Hashtable;
18	<	import java.util.HashMap;
19	<	import java.util.Iterator;
20	<	import java.util.Enumeration;
21	<	import java.util.ConcurrentModificationException;
22	<	import java.util.NoSuchElementException;
23	<	import java.util.concurrent.ConcurrentMap;
24	<	import java.util.concurrent.ThreadLocalRandom;
25	<	import java.util.concurrent.locks.LockSupport;
26	<	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
27	<	import java.util.concurrent.atomic.AtomicReference;
9	>	import jsr166e.ForkJoinPool;
10
11	+	import java.io.ObjectStreamField;
12		import java.io.Serializable;
13	<
14	<	import java.util.Comparator;
13	>	import java.lang.reflect.ParameterizedType;
14	>	import java.lang.reflect.Type;
15	>	import java.util.AbstractMap;
16		import java.util.Arrays;
33	–	import java.util.Map;
34	–	import java.util.Set;
17		import java.util.Collection;
18	<	import java.util.AbstractMap;
19	<	import java.util.AbstractSet;
20	<	import java.util.AbstractCollection;
39	<	import java.util.Hashtable;
18	>	import java.util.Comparator;
19	>	import java.util.ConcurrentModificationException;
20	>	import java.util.Enumeration;
21		import java.util.HashMap;
22	+	import java.util.Hashtable;
23		import java.util.Iterator;
24	<	import java.util.Enumeration;
43	<	import java.util.ConcurrentModificationException;
24	>	import java.util.Map;
25		import java.util.NoSuchElementException;
26	+	import java.util.Set;
27		import java.util.concurrent.ConcurrentMap;
46	–	import java.util.concurrent.ThreadLocalRandom;
47	–	import java.util.concurrent.locks.LockSupport;
48	–	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
28		import java.util.concurrent.atomic.AtomicReference;
29	<
30	<	import java.io.Serializable;
29	>	import java.util.concurrent.atomic.AtomicInteger;
30	>	import java.util.concurrent.locks.LockSupport;
31	>	import java.util.concurrent.locks.ReentrantLock;
32
33		/**
34		* A hash table supporting full concurrency of retrievals and
#	Line 102 | Line 82 | import java.io.Serializable;
82		* expected {@code concurrencyLevel} as an additional hint for
83		* internal sizing.  Note that using many keys with exactly the same
84		* {@code hashCode()} is a sure way to slow down performance of any
85	<	* hash table.
85	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
86	>	* this class may use comparison order among keys to help break ties.
87		*
88		* <p>A {@link Set} projection of a ConcurrentHashMapV8 may be created
89		* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
#	Line 110 | Line 91 | import java.io.Serializable;
91		* mapped values are (perhaps transiently) not used or all take the
92		* same mapping value.
93		*
113	–	* <p>A ConcurrentHashMapV8 can be used as scalable frequency map (a
114	–	* form of histogram or multiset) by using {@link LongAdder} values
115	–	* and initializing via {@link #computeIfAbsent}. For example, to add
116	–	* a count to a {@code ConcurrentHashMapV8<String,LongAdder> freqs}, you
117	–	* can use {@code freqs.computeIfAbsent(k -> new
118	–	* LongAdder()).increment();}
119	–	*
94		* <p>This class and its views and iterators implement all of the
95		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
96		* interfaces.
#	Line 124 | Line 98 | import java.io.Serializable;
98		* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
99		* does <em>not</em> allow {@code null} to be used as a key or value.
100		*
101	<	* <p>ConcurrentHashMapV8s support parallel operations using the {@link
102	<	* ForkJoinPool#commonPool}. (Tasks that may be used in other contexts
103	<	* are available in class {@link ForkJoinTasks}). These operations are
104	<	* designed to be safely, and often sensibly, applied even with maps
105	<	* that are being concurrently updated by other threads; for example,
106	<	* when computing a snapshot summary of the values in a shared
107	<	* registry.  There are three kinds of operation, each with four
108	<	* forms, accepting functions with Keys, Values, Entries, and (Key,
109	<	* Value) arguments and/or return values. (The first three forms are
110	<	* also available via the {@link #keySet()}, {@link #values()} and
111	<	* {@link #entrySet()} views). Because the elements of a
112	<	* ConcurrentHashMapV8 are not ordered in any particular way, and may be
113	<	* processed in different orders in different parallel executions, the
114	<	* correctness of supplied functions should not depend on any
115	<	* ordering, or on any other objects or values that may transiently
142	<	* change while computation is in progress; and except for forEach
143	<	* actions, should ideally be side-effect-free.
101	>	* <p>ConcurrentHashMapV8s support a set of sequential and parallel bulk
102	>	* operations that are designed
103	>	* to be safely, and often sensibly, applied even with maps that are
104	>	* being concurrently updated by other threads; for example, when
105	>	* computing a snapshot summary of the values in a shared registry.
106	>	* There are three kinds of operation, each with four forms, accepting
107	>	* functions with Keys, Values, Entries, and (Key, Value) arguments
108	>	* and/or return values. Because the elements of a ConcurrentHashMapV8
109	>	* are not ordered in any particular way, and may be processed in
110	>	* different orders in different parallel executions, the correctness
111	>	* of supplied functions should not depend on any ordering, or on any
112	>	* other objects or values that may transiently change while
113	>	* computation is in progress; and except for forEach actions, should
114	>	* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry}
115	>	* objects do not support method {@code setValue}.
116		*
117		* <ul>
118		* <li> forEach: Perform a given action on each element.
#	Line 167 | Line 139 | import java.io.Serializable;
139		* <li> Reductions to scalar doubles, longs, and ints, using a
140		* given basis value.</li>
141		*
170	–	* </li>
142		* </ul>
143	+	* </li>
144		* </ul>
145		*
146	+	* <p>These bulk operations accept a {@code parallelismThreshold}
147	+	* argument. Methods proceed sequentially if the current map size is
148	+	* estimated to be less than the given threshold. Using a value of
149	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
150	+	* of {@code 1} results in maximal parallelism by partitioning into
151	+	* enough subtasks to fully utilize the {@link
152	+	* ForkJoinPool#commonPool()} that is used for all parallel
153	+	* computations. Normally, you would initially choose one of these
154	+	* extreme values, and then measure performance of using in-between
155	+	* values that trade off overhead versus throughput.
156	+	*
157		* <p>The concurrency properties of bulk operations follow
158		* from those of ConcurrentHashMapV8: Any non-null result returned
159		* from {@code get(key)} and related access methods bears a
#	Line 213 | Line 196 | import java.io.Serializable;
196		* exceptions, or would have done so if the first exception had
197		* not occurred.
198		*
199	<	* <p>Parallel speedups for bulk operations compared to sequential
200	<	* processing are common but not guaranteed.  Operations involving
201	<	* brief functions on small maps may execute more slowly than
202	<	* sequential loops if the underlying work to parallelize the
203	<	* computation is more expensive than the computation itself.
204	<	* Similarly, parallelization may not lead to much actual parallelism
205	<	* if all processors are busy performing unrelated tasks.
199	>	* <p>Speedups for parallel compared to sequential forms are common
200	>	* but not guaranteed.  Parallel operations involving brief functions
201	>	* on small maps may execute more slowly than sequential forms if the
202	>	* underlying work to parallelize the computation is more expensive
203	>	* than the computation itself.  Similarly, parallelization may not
204	>	* lead to much actual parallelism if all processors are busy
205	>	* performing unrelated tasks.
206		*
207		* <p>All arguments to all task methods must be non-null.
208		*
#	Line 236 | Line 219 | import java.io.Serializable;
219		* @param <K> the type of keys maintained by this map
220		* @param <V> the type of mapped values
221		*/
222	<	public class ConcurrentHashMapV8<K, V>
223	<	implements ConcurrentMap<K, V>, Serializable {
222	>	public class ConcurrentHashMapV8<K,V> extends AbstractMap<K,V>
223	>	implements ConcurrentMap<K,V>, Serializable {
224		private static final long serialVersionUID = 7249069246763182397L;
225
226		/**
227	<	* A partitionable iterator. A Spliterator can be traversed
228	<	* directly, but can also be partitioned (before traversal) by
229	<	* creating another Spliterator that covers a non-overlapping
247	<	* portion of the elements, and so may be amenable to parallel
248	<	* execution.
249	<	*
250	<	* <p>This interface exports a subset of expected JDK8
251	<	* functionality.
252	<	*
253	<	* <p>Sample usage: Here is one (of the several) ways to compute
254	<	* the sum of the values held in a map using the ForkJoin
255	<	* framework. As illustrated here, Spliterators are well suited to
256	<	* designs in which a task repeatedly splits off half its work
257	<	* into forked subtasks until small enough to process directly,
258	<	* and then joins these subtasks. Variants of this style can also
259	<	* be used in completion-based designs.
260	<	*
261	<	* <pre>
262	<	* {@code ConcurrentHashMapV8<String, Long> m = ...
263	<	* // split as if have 8 * parallelism, for load balance
264	<	* int n = m.size();
265	<	* int p = aForkJoinPool.getParallelism() * 8;
266	<	* int split = (n < p)? n : p;
267	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
268	<	* // ...
269	<	* static class SumValues extends RecursiveTask<Long> {
270	<	*   final Spliterator<Long> s;
271	<	*   final int split;             // split while > 1
272	<	*   final SumValues nextJoin;    // records forked subtasks to join
273	<	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
274	<	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
275	<	*   }
276	<	*   public Long compute() {
277	<	*     long sum = 0;
278	<	*     SumValues subtasks = null; // fork subtasks
279	<	*     for (int s = split >>> 1; s > 0; s >>>= 1)
280	<	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
281	<	*     while (s.hasNext())        // directly process remaining elements
282	<	*       sum += s.next();
283	<	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
284	<	*       sum += t.join();         // collect subtask results
285	<	*     return sum;
286	<	*   }
287	<	* }
288	<	* }</pre>
227	>	* An object for traversing and partitioning elements of a source.
228	>	* This interface provides a subset of the functionality of JDK8
229	>	* java.util.Spliterator.
230		*/
231	<	public static interface Spliterator<T> extends Iterator<T> {
231	>	public static interface ConcurrentHashMapSpliterator<T> {
232		/**
233	<	* Returns a Spliterator covering approximately half of the
234	<	* elements, guaranteed not to overlap with those subsequently
235	<	* returned by this Spliterator.  After invoking this method,
236	<	* the current Spliterator will <em>not</em> produce any of
296	<	* the elements of the returned Spliterator, but the two
297	<	* Spliterators together will produce all of the elements that
298	<	* would have been produced by this Spliterator had this
299	<	* method not been called. The exact number of elements
300	<	* produced by the returned Spliterator is not guaranteed, and
301	<	* may be zero (i.e., with {@code hasNext()} reporting {@code
302	<	* false}) if this Spliterator cannot be further split.
303	<	*
304	<	* @return a Spliterator covering approximately half of the
305	<	* elements
306	<	* @throws IllegalStateException if this Spliterator has
307	<	* already commenced traversing elements
233	>	* If possible, returns a new spliterator covering
234	>	* approximately one half of the elements, which will not be
235	>	* covered by this spliterator. Returns null if cannot be
236	>	* split.
237		*/
238	<	Spliterator<T> split();
238	>	ConcurrentHashMapSpliterator<T> trySplit();
239	>	/**
240	>	* Returns an estimate of the number of elements covered by
241	>	* this Spliterator.
242	>	*/
243	>	long estimateSize();
244	>
245	>	/** Applies the action to each untraversed element */
246	>	void forEachRemaining(Action<? super T> action);
247	>	/** If an element remains, applies the action and returns true. */
248	>	boolean tryAdvance(Action<? super T> action);
249		}
250
251	+	// Sams
252	+	/** Interface describing a void action of one argument */
253	+	public interface Action<A> { void apply(A a); }
254	+	/** Interface describing a void action of two arguments */
255	+	public interface BiAction<A,B> { void apply(A a, B b); }
256	+	/** Interface describing a function of one argument */
257	+	public interface Fun<A,T> { T apply(A a); }
258	+	/** Interface describing a function of two arguments */
259	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
260	+	/** Interface describing a function mapping its argument to a double */
261	+	public interface ObjectToDouble<A> { double apply(A a); }
262	+	/** Interface describing a function mapping its argument to a long */
263	+	public interface ObjectToLong<A> { long apply(A a); }
264	+	/** Interface describing a function mapping its argument to an int */
265	+	public interface ObjectToInt<A> {int apply(A a); }
266	+	/** Interface describing a function mapping two arguments to a double */
267	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
268	+	/** Interface describing a function mapping two arguments to a long */
269	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
270	+	/** Interface describing a function mapping two arguments to an int */
271	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
272	+	/** Interface describing a function mapping two doubles to a double */
273	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
274	+	/** Interface describing a function mapping two longs to a long */
275	+	public interface LongByLongToLong { long apply(long a, long b); }
276	+	/** Interface describing a function mapping two ints to an int */
277	+	public interface IntByIntToInt { int apply(int a, int b); }
278	+
279
280		/*
281		* Overview:
#	Line 320 | Line 287 | public class ConcurrentHashMapV8<K, V>
287		* the same or better than java.util.HashMap, and to support high
288		* initial insertion rates on an empty table by many threads.
289		*
290	<	* Each key-value mapping is held in a Node.  Because Node fields
291	<	* can contain special values, they are defined using plain Object
292	<	* types. Similarly in turn, all internal methods that use them
293	<	* work off Object types. And similarly, so do the internal
294	<	* methods of auxiliary iterator and view classes.  All public
295	<	* generic typed methods relay in/out of these internal methods,
296	<	* supplying null-checks and casts as needed. This also allows
297	<	* many of the public methods to be factored into a smaller number
298	<	* of internal methods (although sadly not so for the five
299	<	* variants of put-related operations). The validation-based
300	<	* approach explained below leads to a lot of code sprawl because
301	<	* retry-control precludes factoring into smaller methods.
290	>	* This map usually acts as a binned (bucketed) hash table.  Each
291	>	* key-value mapping is held in a Node.  Most nodes are instances
292	>	* of the basic Node class with hash, key, value, and next
293	>	* fields. However, various subclasses exist: TreeNodes are
294	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
295	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
296	>	* of bins during resizing. ReservationNodes are used as
297	>	* placeholders while establishing values in computeIfAbsent and
298	>	* related methods.  The types TreeBin, ForwardingNode, and
299	>	* ReservationNode do not hold normal user keys, values, or
300	>	* hashes, and are readily distinguishable during search etc
301	>	* because they have negative hash fields and null key and value
302	>	* fields. (These special nodes are either uncommon or transient,
303	>	* so the impact of carrying around some unused fields is
304	>	* insignificant.)
305		*
306		* The table is lazily initialized to a power-of-two size upon the
307		* first insertion.  Each bin in the table normally contains a
#	Line 339 | Line 309 | public class ConcurrentHashMapV8<K, V>
309		* Table accesses require volatile/atomic reads, writes, and
310		* CASes.  Because there is no other way to arrange this without
311		* adding further indirections, we use intrinsics
312	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
313	<	* are always accurately traversable under volatile reads, so long
314	<	* as lookups check hash code and non-nullness of value before
315	<	* checking key equality.
316	<	*
317	<	* We use the top two bits of Node hash fields for control
348	<	* purposes -- they are available anyway because of addressing
349	<	* constraints.  As explained further below, these top bits are
350	<	* used as follows:
351	<	*  00 - Normal
352	<	*  01 - Locked
353	<	*  11 - Locked and may have a thread waiting for lock
354	<	*  10 - Node is a forwarding node
355	<	*
356	<	* The lower 30 bits of each Node's hash field contain a
357	<	* transformation of the key's hash code, except for forwarding
358	<	* nodes, for which the lower bits are zero (and so always have
359	<	* hash field == MOVED).
312	>	* (sun.misc.Unsafe) operations.
313	>	*
314	>	* We use the top (sign) bit of Node hash fields for control
315	>	* purposes -- it is available anyway because of addressing
316	>	* constraints.  Nodes with negative hash fields are specially
317	>	* handled or ignored in map methods.
318		*
319		* Insertion (via put or its variants) of the first node in an
320		* empty bin is performed by just CASing it to the bin.  This is
#	Line 365 | Line 323 | public class ConcurrentHashMapV8<K, V>
323		* delete, and replace) require locks.  We do not want to waste
324		* the space required to associate a distinct lock object with
325		* each bin, so instead use the first node of a bin list itself as
326	<	* a lock. Blocking support for these locks relies on the builtin
327	<	* "synchronized" monitors.  However, we also need a tryLock
370	<	* construction, so we overlay these by using bits of the Node
371	<	* hash field for lock control (see above), and so normally use
372	<	* builtin monitors only for blocking and signalling using
373	<	* wait/notifyAll constructions. See Node.tryAwaitLock.
326	>	* a lock. Locking support for these locks relies on builtin
327	>	* "synchronized" monitors.
328		*
329		* Using the first node of a list as a lock does not by itself
330		* suffice though: When a node is locked, any update must first
331		* validate that it is still the first node after locking it, and
332		* retry if not. Because new nodes are always appended to lists,
333		* once a node is first in a bin, it remains first until deleted
334	<	* or the bin becomes invalidated (upon resizing).  However,
381	<	* operations that only conditionally update may inspect nodes
382	<	* until the point of update. This is a converse of sorts to the
383	<	* lazy locking technique described by Herlihy & Shavit.
334	>	* or the bin becomes invalidated (upon resizing).
335		*
336		* The main disadvantage of per-bin locks is that other update
337		* operations on other nodes in a bin list protected by the same
#	Line 413 | Line 364 | public class ConcurrentHashMapV8<K, V>
364		* sometimes deviate significantly from uniform randomness.  This
365		* includes the case when N > (1<<30), so some keys MUST collide.
366		* Similarly for dumb or hostile usages in which multiple keys are
367	<	* designed to have identical hash codes. Also, although we guard
368	<	* against the worst effects of this (see method spread), sets of
369	<	* hashes may differ only in bits that do not impact their bin
370	<	* index for a given power-of-two mask.  So we use a secondary
371	<	* strategy that applies when the number of nodes in a bin exceeds
372	<	* a threshold, and at least one of the keys implements
422	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
423	<	* (a specialized form of red-black trees), bounding search time
424	<	* to O(log N).  Each search step in a TreeBin is around twice as
367	>	* designed to have identical hash codes or ones that differs only
368	>	* in masked-out high bits. So we use a secondary strategy that
369	>	* applies when the number of nodes in a bin exceeds a
370	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
371	>	* specialized form of red-black trees), bounding search time to
372	>	* O(log N).  Each search step in a TreeBin is at least twice as
373		* slow as in a regular list, but given that N cannot exceed
374		* (1<<64) (before running out of addresses) this bounds search
375		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 432 | Line 380 | public class ConcurrentHashMapV8<K, V>
380		* iterators in the same way.
381		*
382		* The table is resized when occupancy exceeds a percentage
383	<	* threshold (nominally, 0.75, but see below).  Only a single
384	<	* thread performs the resize (using field "sizeCtl", to arrange
385	<	* exclusion), but the table otherwise remains usable for reads
386	<	* and updates. Resizing proceeds by transferring bins, one by
387	<	* one, from the table to the next table.  Because we are using
383	>	* threshold (nominally, 0.75, but see below).  Any thread
384	>	* noticing an overfull bin may assist in resizing after the
385	>	* initiating thread allocates and sets up the replacement array.
386	>	* However, rather than stalling, these other threads may proceed
387	>	* with insertions etc.  The use of TreeBins shields us from the
388	>	* worst case effects of overfilling while resizes are in
389	>	* progress.  Resizing proceeds by transferring bins, one by one,
390	>	* from the table to the next table. However, threads claim small
391	>	* blocks of indices to transfer (via field transferIndex) before
392	>	* doing so, reducing contention.  Because we are using
393		* power-of-two expansion, the elements from each bin must either
394		* stay at same index, or move with a power of two offset. We
395		* eliminate unnecessary node creation by catching cases where old
#	Line 450 | Line 403 | public class ConcurrentHashMapV8<K, V>
403		* its key. On encountering a forwarding node, access and update
404		* operations restart, using the new table.
405		*
406	<	* Each bin transfer requires its bin lock. However, unlike other
407	<	* cases, a transfer can skip a bin if it fails to acquire its
408	<	* lock, and revisit it later (unless it is a TreeBin). Method
409	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
410	<	* have been skipped because of failure to acquire a lock, and
411	<	* blocks only if none are available (i.e., only very rarely).
412	<	* The transfer operation must also ensure that all accessible
413	<	* bins in both the old and new table are usable by any traversal.
414	<	* When there are no lock acquisition failures, this is arranged
415	<	* simply by proceeding from the last bin (table.length - 1) up
416	<	* towards the first.  Upon seeing a forwarding node, traversals
417	<	* (see class Iter) arrange to move to the new table
418	<	* without revisiting nodes.  However, when any node is skipped
419	<	* during a transfer, all earlier table bins may have become
420	<	* visible, so are initialized with a reverse-forwarding node back
421	<	* to the old table until the new ones are established. (This
422	<	* sometimes requires transiently locking a forwarding node, which
423	<	* is possible under the above encoding.) These more expensive
424	<	* mechanics trigger only when necessary.
406	>	* Each bin transfer requires its bin lock, which can stall
407	>	* waiting for locks while resizing. However, because other
408	>	* threads can join in and help resize rather than contend for
409	>	* locks, average aggregate waits become shorter as resizing
410	>	* progresses.  The transfer operation must also ensure that all
411	>	* accessible bins in both the old and new table are usable by any
412	>	* traversal.  This is arranged in part by proceeding from the
413	>	* last bin (table.length - 1) up towards the first.  Upon seeing
414	>	* a forwarding node, traversals (see class Traverser) arrange to
415	>	* move to the new table without revisiting nodes.  To ensure that
416	>	* no intervening nodes are skipped even when moved out of order,
417	>	* a stack (see class TableStack) is created on first encounter of
418	>	* a forwarding node during a traversal, to maintain its place if
419	>	* later processing the current table. The need for these
420	>	* save/restore mechanics is relatively rare, but when one
421	>	* forwarding node is encountered, typically many more will be.
422	>	* So Traversers use a simple caching scheme to avoid creating so
423	>	* many new TableStack nodes. (Thanks to Peter Levart for
424	>	* suggesting use of a stack here.)
425		*
426		* The traversal scheme also applies to partial traversals of
427		* ranges of bins (via an alternate Traverser constructor)
#	Line 483 | Line 436 | public class ConcurrentHashMapV8<K, V>
436		* These cases attempt to override the initial capacity settings,
437		* but harmlessly fail to take effect in cases of races.
438		*
439	<	* The element count is maintained using a LongAdder, which avoids
440	<	* contention on updates but can encounter cache thrashing if read
441	<	* too frequently during concurrent access. To avoid reading so
442	<	* often, resizing is attempted either when a bin lock is
443	<	* contended, or upon adding to a bin already holding two or more
444	<	* nodes (checked before adding in the xIfAbsent methods, after
445	<	* adding in others). Under uniform hash distributions, the
446	<	* probability of this occurring at threshold is around 13%,
447	<	* meaning that only about 1 in 8 puts check threshold (and after
448	<	* resizing, many fewer do so). But this approximation has high
449	<	* variance for small table sizes, so we check on any collision
450	<	* for sizes <= 64. The bulk putAll operation further reduces
451	<	* contention by only committing count updates upon these size
452	<	* checks.
439	>	* The element count is maintained using a specialization of
440	>	* LongAdder. We need to incorporate a specialization rather than
441	>	* just use a LongAdder in order to access implicit
442	>	* contention-sensing that leads to creation of multiple
443	>	* CounterCells.  The counter mechanics avoid contention on
444	>	* updates but can encounter cache thrashing if read too
445	>	* frequently during concurrent access. To avoid reading so often,
446	>	* resizing under contention is attempted only upon adding to a
447	>	* bin already holding two or more nodes. Under uniform hash
448	>	* distributions, the probability of this occurring at threshold
449	>	* is around 13%, meaning that only about 1 in 8 puts check
450	>	* threshold (and after resizing, many fewer do so).
451	>	*
452	>	* TreeBins use a special form of comparison for search and
453	>	* related operations (which is the main reason we cannot use
454	>	* existing collections such as TreeMaps). TreeBins contain
455	>	* Comparable elements, but may contain others, as well as
456	>	* elements that are Comparable but not necessarily Comparable for
457	>	* the same T, so we cannot invoke compareTo among them. To handle
458	>	* this, the tree is ordered primarily by hash value, then by
459	>	* Comparable.compareTo order if applicable.  On lookup at a node,
460	>	* if elements are not comparable or compare as 0 then both left
461	>	* and right children may need to be searched in the case of tied
462	>	* hash values. (This corresponds to the full list search that
463	>	* would be necessary if all elements were non-Comparable and had
464	>	* tied hashes.) On insertion, to keep a total ordering (or as
465	>	* close as is required here) across rebalancings, we compare
466	>	* classes and identityHashCodes as tie-breakers. The red-black
467	>	* balancing code is updated from pre-jdk-collections
468	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
469	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
470	>	* Algorithms" (CLR).
471	>	*
472	>	* TreeBins also require an additional locking mechanism.  While
473	>	* list traversal is always possible by readers even during
474	>	* updates, tree traversal is not, mainly because of tree-rotations
475	>	* that may change the root node and/or its linkages.  TreeBins
476	>	* include a simple read-write lock mechanism parasitic on the
477	>	* main bin-synchronization strategy: Structural adjustments
478	>	* associated with an insertion or removal are already bin-locked
479	>	* (and so cannot conflict with other writers) but must wait for
480	>	* ongoing readers to finish. Since there can be only one such
481	>	* waiter, we use a simple scheme using a single "waiter" field to
482	>	* block writers.  However, readers need never block.  If the root
483	>	* lock is held, they proceed along the slow traversal path (via
484	>	* next-pointers) until the lock becomes available or the list is
485	>	* exhausted, whichever comes first. These cases are not fast, but
486	>	* maximize aggregate expected throughput.
487		*
488		* Maintaining API and serialization compatibility with previous
489		* versions of this class introduces several oddities. Mainly: We
#	Line 506 | Line 493 | public class ConcurrentHashMapV8<K, V>
493		* time that we can guarantee to honor it.) We also declare an
494		* unused "Segment" class that is instantiated in minimal form
495		* only when serializing.
496	+	*
497	+	* Also, solely for compatibility with previous versions of this
498	+	* class, it extends AbstractMap, even though all of its methods
499	+	* are overridden, so it is just useless baggage.
500	+	*
501	+	* This file is organized to make things a little easier to follow
502	+	* while reading than they might otherwise: First the main static
503	+	* declarations and utilities, then fields, then main public
504	+	* methods (with a few factorings of multiple public methods into
505	+	* internal ones), then sizing methods, trees, traversers, and
506	+	* bulk operations.
507		*/
508
509		/* ---------------- Constants -------------- */
#	Line 547 | Line 545 | public class ConcurrentHashMapV8<K, V>
545		private static final float LOAD_FACTOR = 0.75f;
546
547		/**
550	–	* The buffer size for skipped bins during transfers. The
551	–	* value is arbitrary but should be large enough to avoid
552	–	* most locking stalls during resizes.
553	–	*/
554	–	private static final int TRANSFER_BUFFER_SIZE = 32;
555	–
556	–	/**
548		* The bin count threshold for using a tree rather than list for a
549	<	* bin.  The value reflects the approximate break-even point for
550	<	* using tree-based operations.
551	<	*/
552	<	private static final int TREE_THRESHOLD = 8;
553	<
563	<	/*
564	<	* Encodings for special uses of Node hash fields. See above for
565	<	* explanation.
549	>	* bin.  Bins are converted to trees when adding an element to a
550	>	* bin with at least this many nodes. The value must be greater
551	>	* than 2, and should be at least 8 to mesh with assumptions in
552	>	* tree removal about conversion back to plain bins upon
553	>	* shrinkage.
554		*/
555	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
568	<	static final int LOCKED    = 0x40000000; // set/tested only as a bit
569	<	static final int WAITING   = 0xc0000000; // both bits set/tested together
570	<	static final int HASH_BITS = 0x3fffffff; // usable bits of normal node hash
571	<
572	<	/* ---------------- Fields -------------- */
555	>	static final int TREEIFY_THRESHOLD = 8;
556
557		/**
558	<	* The array of bins. Lazily initialized upon first insertion.
559	<	* Size is always a power of two. Accessed directly by iterators.
558	>	* The bin count threshold for untreeifying a (split) bin during a
559	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
560	>	* most 6 to mesh with shrinkage detection under removal.
561		*/
562	<	transient volatile Node[] table;
562	>	static final int UNTREEIFY_THRESHOLD = 6;
563
564		/**
565	<	* The counter maintaining number of elements.
565	>	* The smallest table capacity for which bins may be treeified.
566	>	* (Otherwise the table is resized if too many nodes in a bin.)
567	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
568	>	* conflicts between resizing and treeification thresholds.
569		*/
570	<	private transient final LongAdder counter;
570	>	static final int MIN_TREEIFY_CAPACITY = 64;
571
572		/**
573	<	* Table initialization and resizing control.  When negative, the
574	<	* table is being initialized or resized. Otherwise, when table is
575	<	* null, holds the initial table size to use upon creation, or 0
576	<	* for default. After initialization, holds the next element count
577	<	* value upon which to resize the table.
573	>	* Minimum number of rebinnings per transfer step. Ranges are
574	>	* subdivided to allow multiple resizer threads.  This value
575	>	* serves as a lower bound to avoid resizers encountering
576	>	* excessive memory contention.  The value should be at least
577	>	* DEFAULT_CAPACITY.
578		*/
579	<	private transient volatile int sizeCtl;
593	<
594	<	// views
595	<	private transient KeySetView<K,V> keySet;
596	<	private transient ValuesView<K,V> values;
597	<	private transient EntrySetView<K,V> entrySet;
598	<
599	<	/** For serialization compatibility. Null unless serialized; see below */
600	<	private Segment<K,V>[] segments;
601	<
602	<	/* ---------------- Table element access -------------- */
579	>	private static final int MIN_TRANSFER_STRIDE = 16;
580
581		/*
582	<	* Volatile access methods are used for table elements as well as
606	<	* elements of in-progress next table while resizing.  Uses are
607	<	* null checked by callers, and implicitly bounds-checked, relying
608	<	* on the invariants that tab arrays have non-zero size, and all
609	<	* indices are masked with (tab.length - 1) which is never
610	<	* negative and always less than length. Note that, to be correct
611	<	* wrt arbitrary concurrency errors by users, bounds checks must
612	<	* operate on local variables, which accounts for some odd-looking
613	<	* inline assignments below.
582	>	* Encodings for Node hash fields. See above for explanation.
583		*/
584	<
585	<	static final Node tabAt(Node[] tab, int i) { // used by Iter
586	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
587	<	}
588	<
589	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
590	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
591	<	}
592	<
593	<	private static final void setTabAt(Node[] tab, int i, Node v) {
594	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
595	<	}
584	>	static final int MOVED     = -1; // hash for forwarding nodes
585	>	static final int TREEBIN   = -2; // hash for roots of trees
586	>	static final int RESERVED  = -3; // hash for transient reservations
587	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
588	>
589	>	/** Number of CPUS, to place bounds on some sizings */
590	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
591	>
592	>	/** For serialization compatibility. */
593	>	private static final ObjectStreamField[] serialPersistentFields = {
594	>	new ObjectStreamField("segments", Segment[].class),
595	>	new ObjectStreamField("segmentMask", Integer.TYPE),
596	>	new ObjectStreamField("segmentShift", Integer.TYPE)
597	>	};
598
599		/* ---------------- Nodes -------------- */
600
601		/**
602	<	* Key-value entry. Note that this is never exported out as a
603	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
604	<	* field of MOVED are special, and do not contain user keys or
605	<	* values.  Otherwise, keys are never null, and null val fields
606	<	* indicate that a node is in the process of being deleted or
607	<	* created. For purposes of read-only access, a key may be read
608	<	* before a val, but can only be used after checking val to be
609	<	* non-null.
610	<	*/
611	<	static class Node {
612	<	volatile int hash;
613	<	final Object key;
643	<	volatile Object val;
644	<	volatile Node next;
602	>	* Key-value entry.  This class is never exported out as a
603	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
604	>	* MapEntry below), but can be used for read-only traversals used
605	>	* in bulk tasks.  Subclasses of Node with a negative hash field
606	>	* are special, and contain null keys and values (but are never
607	>	* exported).  Otherwise, keys and vals are never null.
608	>	*/
609	>	static class Node<K,V> implements Map.Entry<K,V> {
610	>	final int hash;
611	>	final K key;
612	>	volatile V val;
613	>	volatile Node<K,V> next;
614
615	<	Node(int hash, Object key, Object val, Node next) {
615	>	Node(int hash, K key, V val, Node<K,V> next) {
616		this.hash = hash;
617		this.key = key;
618		this.val = val;
619		this.next = next;
620		}
621
622	<	/** CompareAndSet the hash field */
623	<	final boolean casHash(int cmp, int val) {
624	<	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
625	<	}
626	<
627	<	/** The number of spins before blocking for a lock */
659	<	static final int MAX_SPINS =
660	<	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
661	<
662	<	/**
663	<	* Spins a while if LOCKED bit set and this node is the first
664	<	* of its bin, and then sets WAITING bits on hash field and
665	<	* blocks (once) if they are still set.  It is OK for this
666	<	* method to return even if lock is not available upon exit,
667	<	* which enables these simple single-wait mechanics.
668	<	*
669	<	* The corresponding signalling operation is performed within
670	<	* callers: Upon detecting that WAITING has been set when
671	<	* unlocking lock (via a failed CAS from non-waiting LOCKED
672	<	* state), unlockers acquire the sync lock and perform a
673	<	* notifyAll.
674	<	*
675	<	* The initial sanity check on tab and bounds is not currently
676	<	* necessary in the only usages of this method, but enables
677	<	* use in other future contexts.
678	<	*/
679	<	final void tryAwaitLock(Node[] tab, int i) {
680	<	if (tab != null && i >= 0 && i < tab.length) { // sanity check
681	<	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
682	<	int spins = MAX_SPINS, h;
683	<	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
684	<	if (spins >= 0) {
685	<	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
686	<	if (r >= 0 && --spins == 0)
687	<	Thread.yield();  // yield before block
688	<	}
689	<	else if (casHash(h, h | WAITING)) {
690	<	synchronized (this) {
691	<	if (tabAt(tab, i) == this &&
692	<	(hash & WAITING) == WAITING) {
693	<	try {
694	<	wait();
695	<	} catch (InterruptedException ie) {
696	<	try {
697	<	Thread.currentThread().interrupt();
698	<	} catch (SecurityException ignore) {
699	<	}
700	<	}
701	<	}
702	<	else
703	<	notifyAll(); // possibly won race vs signaller
704	<	}
705	<	break;
706	<	}
707	<	}
708	<	}
709	<	}
710	<
711	<	// Unsafe mechanics for casHash
712	<	private static final sun.misc.Unsafe UNSAFE;
713	<	private static final long hashOffset;
714	<
715	<	static {
716	<	try {
717	<	UNSAFE = getUnsafe();
718	<	Class<?> k = Node.class;
719	<	hashOffset = UNSAFE.objectFieldOffset
720	<	(k.getDeclaredField("hash"));
721	<	} catch (Exception e) {
722	<	throw new Error(e);
723	<	}
724	<	}
725	<	}
726	<
727	<	/* ---------------- TreeBins -------------- */
728	<
729	<	/**
730	<	* Nodes for use in TreeBins
731	<	*/
732	<	static final class TreeNode extends Node {
733	<	TreeNode parent;  // red-black tree links
734	<	TreeNode left;
735	<	TreeNode right;
736	<	TreeNode prev;    // needed to unlink next upon deletion
737	<	boolean red;
738	<
739	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
740	<	super(hash, key, val, next);
741	<	this.parent = parent;
742	<	}
743	<	}
744	<
745	<	/**
746	<	* A specialized form of red-black tree for use in bins
747	<	* whose size exceeds a threshold.
748	<	*
749	<	* TreeBins use a special form of comparison for search and
750	<	* related operations (which is the main reason we cannot use
751	<	* existing collections such as TreeMaps). TreeBins contain
752	<	* Comparable elements, but may contain others, as well as
753	<	* elements that are Comparable but not necessarily Comparable<T>
754	<	* for the same T, so we cannot invoke compareTo among them. To
755	<	* handle this, the tree is ordered primarily by hash value, then
756	<	* by getClass().getName() order, and then by Comparator order
757	<	* among elements of the same class.  On lookup at a node, if
758	<	* elements are not comparable or compare as 0, both left and
759	<	* right children may need to be searched in the case of tied hash
760	<	* values. (This corresponds to the full list search that would be
761	<	* necessary if all elements were non-Comparable and had tied
762	<	* hashes.)  The red-black balancing code is updated from
763	<	* pre-jdk-collections
764	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
765	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
766	<	* Algorithms" (CLR).
767	<	*
768	<	* TreeBins also maintain a separate locking discipline than
769	<	* regular bins. Because they are forwarded via special MOVED
770	<	* nodes at bin heads (which can never change once established),
771	<	* we cannot use those nodes as locks. Instead, TreeBin
772	<	* extends AbstractQueuedSynchronizer to support a simple form of
773	<	* read-write lock. For update operations and table validation,
774	<	* the exclusive form of lock behaves in the same way as bin-head
775	<	* locks. However, lookups use shared read-lock mechanics to allow
776	<	* multiple readers in the absence of writers.  Additionally,
777	<	* these lookups do not ever block: While the lock is not
778	<	* available, they proceed along the slow traversal path (via
779	<	* next-pointers) until the lock becomes available or the list is
780	<	* exhausted, whichever comes first. (These cases are not fast,
781	<	* but maximize aggregate expected throughput.)  The AQS mechanics
782	<	* for doing this are straightforward.  The lock state is held as
783	<	* AQS getState().  Read counts are negative; the write count (1)
784	<	* is positive.  There are no signalling preferences among readers
785	<	* and writers. Since we don't need to export full Lock API, we
786	<	* just override the minimal AQS methods and use them directly.
787	<	*/
788	<	static final class TreeBin extends AbstractQueuedSynchronizer {
789	<	private static final long serialVersionUID = 2249069246763182397L;
790	<	transient TreeNode root;  // root of tree
791	<	transient TreeNode first; // head of next-pointer list
792	<
793	<	/* AQS overrides */
794	<	public final boolean isHeldExclusively() { return getState() > 0; }
795	<	public final boolean tryAcquire(int ignore) {
796	<	if (compareAndSetState(0, 1)) {
797	<	setExclusiveOwnerThread(Thread.currentThread());
798	<	return true;
799	<	}
800	<	return false;
801	<	}
802	<	public final boolean tryRelease(int ignore) {
803	<	setExclusiveOwnerThread(null);
804	<	setState(0);
805	<	return true;
806	<	}
807	<	public final int tryAcquireShared(int ignore) {
808	<	for (int c;;) {
809	<	if ((c = getState()) > 0)
810	<	return -1;
811	<	if (compareAndSetState(c, c -1))
812	<	return 1;
813	<	}
814	<	}
815	<	public final boolean tryReleaseShared(int ignore) {
816	<	int c;
817	<	do {} while (!compareAndSetState(c = getState(), c + 1));
818	<	return c == -1;
819	<	}
820	<
821	<	/** From CLR */
822	<	private void rotateLeft(TreeNode p) {
823	<	if (p != null) {
824	<	TreeNode r = p.right, pp, rl;
825	<	if ((rl = p.right = r.left) != null)
826	<	rl.parent = p;
827	<	if ((pp = r.parent = p.parent) == null)
828	<	root = r;
829	<	else if (pp.left == p)
830	<	pp.left = r;
831	<	else
832	<	pp.right = r;
833	<	r.left = p;
834	<	p.parent = r;
835	<	}
836	<	}
837	<
838	<	/** From CLR */
839	<	private void rotateRight(TreeNode p) {
840	<	if (p != null) {
841	<	TreeNode l = p.left, pp, lr;
842	<	if ((lr = p.left = l.right) != null)
843	<	lr.parent = p;
844	<	if ((pp = l.parent = p.parent) == null)
845	<	root = l;
846	<	else if (pp.right == p)
847	<	pp.right = l;
848	<	else
849	<	pp.left = l;
850	<	l.right = p;
851	<	p.parent = l;
852	<	}
853	<	}
854	<
855	<	/**
856	<	* Returns the TreeNode (or null if not found) for the given key
857	<	* starting at given root.
858	<	*/
859	<	@SuppressWarnings("unchecked") final TreeNode getTreeNode
860	<	(int h, Object k, TreeNode p) {
861	<	Class<?> c = k.getClass();
862	<	while (p != null) {
863	<	int dir, ph;  Object pk; Class<?> pc;
864	<	if ((ph = p.hash) == h) {
865	<	if ((pk = p.key) == k || k.equals(pk))
866	<	return p;
867	<	if (c != (pc = pk.getClass()) ||
868	<	!(k instanceof Comparable) ||
869	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
870	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
871	<	TreeNode r = null, s = null, pl, pr;
872	<	if (dir >= 0) {
873	<	if ((pl = p.left) != null && h <= pl.hash)
874	<	s = pl;
875	<	}
876	<	else if ((pr = p.right) != null && h >= pr.hash)
877	<	s = pr;
878	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
879	<	return r;
880	<	}
881	<	}
882	<	else
883	<	dir = (h < ph) ? -1 : 1;
884	<	p = (dir > 0) ? p.right : p.left;
885	<	}
886	<	return null;
622	>	public final K getKey()       { return key; }
623	>	public final V getValue()     { return val; }
624	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
625	>	public final String toString(){ return key + "=" + val; }
626	>	public final V setValue(V value) {
627	>	throw new UnsupportedOperationException();
628		}
629
630	<	/**
631	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
632	<	* read-lock to call getTreeNode, but during failure to get
633	<	* lock, searches along next links.
634	<	*/
635	<	final Object getValue(int h, Object k) {
636	<	Node r = null;
896	<	int c = getState(); // Must read lock state first
897	<	for (Node e = first; e != null; e = e.next) {
898	<	if (c <= 0 && compareAndSetState(c, c - 1)) {
899	<	try {
900	<	r = getTreeNode(h, k, root);
901	<	} finally {
902	<	releaseShared(0);
903	<	}
904	<	break;
905	<	}
906	<	else if ((e.hash & HASH_BITS) == h && k.equals(e.key)) {
907	<	r = e;
908	<	break;
909	<	}
910	<	else
911	<	c = getState();
912	<	}
913	<	return r == null ? null : r.val;
630	>	public final boolean equals(Object o) {
631	>	Object k, v, u; Map.Entry<?,?> e;
632	>	return ((o instanceof Map.Entry) &&
633	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
634	>	(v = e.getValue()) != null &&
635	>	(k == key || k.equals(key)) &&
636	>	(v == (u = val) || v.equals(u)));
637		}
638
639		/**
640	<	* Finds or adds a node.
918	<	* @return null if added
640	>	* Virtualized support for map.get(); overridden in subclasses.
641		*/
642	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
643	<	(int h, Object k, Object v) {
644	<	Class<?> c = k.getClass();
645	<	TreeNode pp = root, p = null;
646	<	int dir = 0;
647	<	while (pp != null) { // find existing node or leaf to insert at
648	<	int ph;  Object pk; Class<?> pc;
649	<	p = pp;
650	<	if ((ph = p.hash) == h) {
929	<	if ((pk = p.key) == k || k.equals(pk))
930	<	return p;
931	<	if (c != (pc = pk.getClass()) ||
932	<	!(k instanceof Comparable) ||
933	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
934	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
935	<	TreeNode r = null, s = null, pl, pr;
936	<	if (dir >= 0) {
937	<	if ((pl = p.left) != null && h <= pl.hash)
938	<	s = pl;
939	<	}
940	<	else if ((pr = p.right) != null && h >= pr.hash)
941	<	s = pr;
942	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
943	<	return r;
944	<	}
945	<	}
946	<	else
947	<	dir = (h < ph) ? -1 : 1;
948	<	pp = (dir > 0) ? p.right : p.left;
949	<	}
950	<
951	<	TreeNode f = first;
952	<	TreeNode x = first = new TreeNode(h, k, v, f, p);
953	<	if (p == null)
954	<	root = x;
955	<	else { // attach and rebalance; adapted from CLR
956	<	TreeNode xp, xpp;
957	<	if (f != null)
958	<	f.prev = x;
959	<	if (dir <= 0)
960	<	p.left = x;
961	<	else
962	<	p.right = x;
963	<	x.red = true;
964	<	while (x != null && (xp = x.parent) != null && xp.red &&
965	<	(xpp = xp.parent) != null) {
966	<	TreeNode xppl = xpp.left;
967	<	if (xp == xppl) {
968	<	TreeNode y = xpp.right;
969	<	if (y != null && y.red) {
970	<	y.red = false;
971	<	xp.red = false;
972	<	xpp.red = true;
973	<	x = xpp;
974	<	}
975	<	else {
976	<	if (x == xp.right) {
977	<	rotateLeft(x = xp);
978	<	xpp = (xp = x.parent) == null ? null : xp.parent;
979	<	}
980	<	if (xp != null) {
981	<	xp.red = false;
982	<	if (xpp != null) {
983	<	xpp.red = true;
984	<	rotateRight(xpp);
985	<	}
986	<	}
987	<	}
988	<	}
989	<	else {
990	<	TreeNode y = xppl;
991	<	if (y != null && y.red) {
992	<	y.red = false;
993	<	xp.red = false;
994	<	xpp.red = true;
995	<	x = xpp;
996	<	}
997	<	else {
998	<	if (x == xp.left) {
999	<	rotateRight(x = xp);
1000	<	xpp = (xp = x.parent) == null ? null : xp.parent;
1001	<	}
1002	<	if (xp != null) {
1003	<	xp.red = false;
1004	<	if (xpp != null) {
1005	<	xpp.red = true;
1006	<	rotateLeft(xpp);
1007	<	}
1008	<	}
1009	<	}
1010	<	}
1011	<	}
1012	<	TreeNode r = root;
1013	<	if (r != null && r.red)
1014	<	r.red = false;
642	>	Node<K,V> find(int h, Object k) {
643	>	Node<K,V> e = this;
644	>	if (k != null) {
645	>	do {
646	>	K ek;
647	>	if (e.hash == h &&
648	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
649	>	return e;
650	>	} while ((e = e.next) != null);
651		}
652		return null;
653		}
1018	–
1019	–	/**
1020	–	* Removes the given node, that must be present before this
1021	–	* call.  This is messier than typical red-black deletion code
1022	–	* because we cannot swap the contents of an interior node
1023	–	* with a leaf successor that is pinned by "next" pointers
1024	–	* that are accessible independently of lock. So instead we
1025	–	* swap the tree linkages.
1026	–	*/
1027	–	final void deleteTreeNode(TreeNode p) {
1028	–	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
1029	–	TreeNode pred = p.prev;
1030	–	if (pred == null)
1031	–	first = next;
1032	–	else
1033	–	pred.next = next;
1034	–	if (next != null)
1035	–	next.prev = pred;
1036	–	TreeNode replacement;
1037	–	TreeNode pl = p.left;
1038	–	TreeNode pr = p.right;
1039	–	if (pl != null && pr != null) {
1040	–	TreeNode s = pr, sl;
1041	–	while ((sl = s.left) != null) // find successor
1042	–	s = sl;
1043	–	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
1044	–	TreeNode sr = s.right;
1045	–	TreeNode pp = p.parent;
1046	–	if (s == pr) { // p was s's direct parent
1047	–	p.parent = s;
1048	–	s.right = p;
1049	–	}
1050	–	else {
1051	–	TreeNode sp = s.parent;
1052	–	if ((p.parent = sp) != null) {
1053	–	if (s == sp.left)
1054	–	sp.left = p;
1055	–	else
1056	–	sp.right = p;
1057	–	}
1058	–	if ((s.right = pr) != null)
1059	–	pr.parent = s;
1060	–	}
1061	–	p.left = null;
1062	–	if ((p.right = sr) != null)
1063	–	sr.parent = p;
1064	–	if ((s.left = pl) != null)
1065	–	pl.parent = s;
1066	–	if ((s.parent = pp) == null)
1067	–	root = s;
1068	–	else if (p == pp.left)
1069	–	pp.left = s;
1070	–	else
1071	–	pp.right = s;
1072	–	replacement = sr;
1073	–	}
1074	–	else
1075	–	replacement = (pl != null) ? pl : pr;
1076	–	TreeNode pp = p.parent;
1077	–	if (replacement == null) {
1078	–	if (pp == null) {
1079	–	root = null;
1080	–	return;
1081	–	}
1082	–	replacement = p;
1083	–	}
1084	–	else {
1085	–	replacement.parent = pp;
1086	–	if (pp == null)
1087	–	root = replacement;
1088	–	else if (p == pp.left)
1089	–	pp.left = replacement;
1090	–	else
1091	–	pp.right = replacement;
1092	–	p.left = p.right = p.parent = null;
1093	–	}
1094	–	if (!p.red) { // rebalance, from CLR
1095	–	TreeNode x = replacement;
1096	–	while (x != null) {
1097	–	TreeNode xp, xpl;
1098	–	if (x.red || (xp = x.parent) == null) {
1099	–	x.red = false;
1100	–	break;
1101	–	}
1102	–	if (x == (xpl = xp.left)) {
1103	–	TreeNode sib = xp.right;
1104	–	if (sib != null && sib.red) {
1105	–	sib.red = false;
1106	–	xp.red = true;
1107	–	rotateLeft(xp);
1108	–	sib = (xp = x.parent) == null ? null : xp.right;
1109	–	}
1110	–	if (sib == null)
1111	–	x = xp;
1112	–	else {
1113	–	TreeNode sl = sib.left, sr = sib.right;
1114	–	if ((sr == null || !sr.red) &&
1115	–	(sl == null || !sl.red)) {
1116	–	sib.red = true;
1117	–	x = xp;
1118	–	}
1119	–	else {
1120	–	if (sr == null || !sr.red) {
1121	–	if (sl != null)
1122	–	sl.red = false;
1123	–	sib.red = true;
1124	–	rotateRight(sib);
1125	–	sib = (xp = x.parent) == null ? null : xp.right;
1126	–	}
1127	–	if (sib != null) {
1128	–	sib.red = (xp == null) ? false : xp.red;
1129	–	if ((sr = sib.right) != null)
1130	–	sr.red = false;
1131	–	}
1132	–	if (xp != null) {
1133	–	xp.red = false;
1134	–	rotateLeft(xp);
1135	–	}
1136	–	x = root;
1137	–	}
1138	–	}
1139	–	}
1140	–	else { // symmetric
1141	–	TreeNode sib = xpl;
1142	–	if (sib != null && sib.red) {
1143	–	sib.red = false;
1144	–	xp.red = true;
1145	–	rotateRight(xp);
1146	–	sib = (xp = x.parent) == null ? null : xp.left;
1147	–	}
1148	–	if (sib == null)
1149	–	x = xp;
1150	–	else {
1151	–	TreeNode sl = sib.left, sr = sib.right;
1152	–	if ((sl == null || !sl.red) &&
1153	–	(sr == null || !sr.red)) {
1154	–	sib.red = true;
1155	–	x = xp;
1156	–	}
1157	–	else {
1158	–	if (sl == null || !sl.red) {
1159	–	if (sr != null)
1160	–	sr.red = false;
1161	–	sib.red = true;
1162	–	rotateLeft(sib);
1163	–	sib = (xp = x.parent) == null ? null : xp.left;
1164	–	}
1165	–	if (sib != null) {
1166	–	sib.red = (xp == null) ? false : xp.red;
1167	–	if ((sl = sib.left) != null)
1168	–	sl.red = false;
1169	–	}
1170	–	if (xp != null) {
1171	–	xp.red = false;
1172	–	rotateRight(xp);
1173	–	}
1174	–	x = root;
1175	–	}
1176	–	}
1177	–	}
1178	–	}
1179	–	}
1180	–	if (p == replacement && (pp = p.parent) != null) {
1181	–	if (p == pp.left) // detach pointers
1182	–	pp.left = null;
1183	–	else if (p == pp.right)
1184	–	pp.right = null;
1185	–	p.parent = null;
1186	–	}
1187	–	}
654		}
655
656	<	/* ---------------- Collision reduction methods -------------- */
656	>	/* ---------------- Static utilities -------------- */
657
658		/**
659	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
660	<	* Because the table uses power-of-two masking, sets of hashes
661	<	* that vary only in bits above the current mask will always
662	<	* collide. (Among known examples are sets of Float keys holding
663	<	* consecutive whole numbers in small tables.)  To counter this,
664	<	* we apply a transform that spreads the impact of higher bits
659	>	* Spreads (XORs) higher bits of hash to lower and also forces top
660	>	* bit to 0. Because the table uses power-of-two masking, sets of
661	>	* hashes that vary only in bits above the current mask will
662	>	* always collide. (Among known examples are sets of Float keys
663	>	* holding consecutive whole numbers in small tables.)  So we
664	>	* apply a transform that spreads the impact of higher bits
665		* downward. There is a tradeoff between speed, utility, and
666		* quality of bit-spreading. Because many common sets of hashes
667	<	* are already reasonably distributed across bits (so don't benefit
668	<	* from spreading), and because we use trees to handle large sets
669	<	* of collisions in bins, we don't need excessively high quality.
670	<	*/
671	<	private static final int spread(int h) {
672	<	h ^= (h >>> 18) ^ (h >>> 12);
1207	<	return (h ^ (h >>> 10)) & HASH_BITS;
1208	<	}
1209	<
1210	<	/**
1211	<	* Replaces a list bin with a tree bin. Call only when locked.
1212	<	* Fails to replace if the given key is non-comparable or table
1213	<	* is, or needs, resizing.
667	>	* are already reasonably distributed (so don't benefit from
668	>	* spreading), and because we use trees to handle large sets of
669	>	* collisions in bins, we just XOR some shifted bits in the
670	>	* cheapest possible way to reduce systematic lossage, as well as
671	>	* to incorporate impact of the highest bits that would otherwise
672	>	* never be used in index calculations because of table bounds.
673		*/
674	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
675	<	if ((key instanceof Comparable) &&
1217	<	(tab.length >= MAXIMUM_CAPACITY || counter.sum() < (long)sizeCtl)) {
1218	<	TreeBin t = new TreeBin();
1219	<	for (Node e = tabAt(tab, index); e != null; e = e.next)
1220	<	t.putTreeNode(e.hash & HASH_BITS, e.key, e.val);
1221	<	setTabAt(tab, index, new Node(MOVED, t, null, null));
1222	<	}
1223	<	}
1224	<
1225	<	/* ---------------- Internal access and update methods -------------- */
1226	<
1227	<	/** Implementation for get and containsKey */
1228	<	private final Object internalGet(Object k) {
1229	<	int h = spread(k.hashCode());
1230	<	retry: for (Node[] tab = table; tab != null;) {
1231	<	Node e, p; Object ek, ev; int eh;      // locals to read fields once
1232	<	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1233	<	if ((eh = e.hash) == MOVED) {
1234	<	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1235	<	return ((TreeBin)ek).getValue(h, k);
1236	<	else {                        // restart with new table
1237	<	tab = (Node[])ek;
1238	<	continue retry;
1239	<	}
1240	<	}
1241	<	else if ((eh & HASH_BITS) == h && (ev = e.val) != null &&
1242	<	((ek = e.key) == k || k.equals(ek)))
1243	<	return ev;
1244	<	}
1245	<	break;
1246	<	}
1247	<	return null;
674	>	static final int spread(int h) {
675	>	return (h ^ (h >>> 16)) & HASH_BITS;
676		}
677
678		/**
1251	–	* Implementation for the four public remove/replace methods:
1252	–	* Replaces node value with v, conditional upon match of cv if
1253	–	* non-null.  If resulting value is null, delete.
1254	–	*/
1255	–	private final Object internalReplace(Object k, Object v, Object cv) {
1256	–	int h = spread(k.hashCode());
1257	–	Object oldVal = null;
1258	–	for (Node[] tab = table;;) {
1259	–	Node f; int i, fh; Object fk;
1260	–	if (tab == null ||
1261	–	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1262	–	break;
1263	–	else if ((fh = f.hash) == MOVED) {
1264	–	if ((fk = f.key) instanceof TreeBin) {
1265	–	TreeBin t = (TreeBin)fk;
1266	–	boolean validated = false;
1267	–	boolean deleted = false;
1268	–	t.acquire(0);
1269	–	try {
1270	–	if (tabAt(tab, i) == f) {
1271	–	validated = true;
1272	–	TreeNode p = t.getTreeNode(h, k, t.root);
1273	–	if (p != null) {
1274	–	Object pv = p.val;
1275	–	if (cv == null || cv == pv || cv.equals(pv)) {
1276	–	oldVal = pv;
1277	–	if ((p.val = v) == null) {
1278	–	deleted = true;
1279	–	t.deleteTreeNode(p);
1280	–	}
1281	–	}
1282	–	}
1283	–	}
1284	–	} finally {
1285	–	t.release(0);
1286	–	}
1287	–	if (validated) {
1288	–	if (deleted)
1289	–	counter.add(-1L);
1290	–	break;
1291	–	}
1292	–	}
1293	–	else
1294	–	tab = (Node[])fk;
1295	–	}
1296	–	else if ((fh & HASH_BITS) != h && f.next == null) // precheck
1297	–	break;                          // rules out possible existence
1298	–	else if ((fh & LOCKED) != 0) {
1299	–	checkForResize();               // try resizing if can't get lock
1300	–	f.tryAwaitLock(tab, i);
1301	–	}
1302	–	else if (f.casHash(fh, fh | LOCKED)) {
1303	–	boolean validated = false;
1304	–	boolean deleted = false;
1305	–	try {
1306	–	if (tabAt(tab, i) == f) {
1307	–	validated = true;
1308	–	for (Node e = f, pred = null;;) {
1309	–	Object ek, ev;
1310	–	if ((e.hash & HASH_BITS) == h &&
1311	–	((ev = e.val) != null) &&
1312	–	((ek = e.key) == k || k.equals(ek))) {
1313	–	if (cv == null || cv == ev || cv.equals(ev)) {
1314	–	oldVal = ev;
1315	–	if ((e.val = v) == null) {
1316	–	deleted = true;
1317	–	Node en = e.next;
1318	–	if (pred != null)
1319	–	pred.next = en;
1320	–	else
1321	–	setTabAt(tab, i, en);
1322	–	}
1323	–	}
1324	–	break;
1325	–	}
1326	–	pred = e;
1327	–	if ((e = e.next) == null)
1328	–	break;
1329	–	}
1330	–	}
1331	–	} finally {
1332	–	if (!f.casHash(fh | LOCKED, fh)) {
1333	–	f.hash = fh;
1334	–	synchronized (f) { f.notifyAll(); };
1335	–	}
1336	–	}
1337	–	if (validated) {
1338	–	if (deleted)
1339	–	counter.add(-1L);
1340	–	break;
1341	–	}
1342	–	}
1343	–	}
1344	–	return oldVal;
1345	–	}
1346	–
1347	–	/*
1348	–	* Internal versions of the six insertion methods, each a
1349	–	* little more complicated than the last. All have
1350	–	* the same basic structure as the first (internalPut):
1351	–	*  1. If table uninitialized, create
1352	–	*  2. If bin empty, try to CAS new node
1353	–	*  3. If bin stale, use new table
1354	–	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1355	–	*  5. Lock and validate; if valid, scan and add or update
1356	–	*
1357	–	* The others interweave other checks and/or alternative actions:
1358	–	*  * Plain put checks for and performs resize after insertion.
1359	–	*  * putIfAbsent prescans for mapping without lock (and fails to add
1360	–	*    if present), which also makes pre-emptive resize checks worthwhile.
1361	–	*  * computeIfAbsent extends form used in putIfAbsent with additional
1362	–	*    mechanics to deal with, calls, potential exceptions and null
1363	–	*    returns from function call.
1364	–	*  * compute uses the same function-call mechanics, but without
1365	–	*    the prescans
1366	–	*  * merge acts as putIfAbsent in the absent case, but invokes the
1367	–	*    update function if present
1368	–	*  * putAll attempts to pre-allocate enough table space
1369	–	*    and more lazily performs count updates and checks.
1370	–	*
1371	–	* Someday when details settle down a bit more, it might be worth
1372	–	* some factoring to reduce sprawl.
1373	–	*/
1374	–
1375	–	/** Implementation for put */
1376	–	private final Object internalPut(Object k, Object v) {
1377	–	int h = spread(k.hashCode());
1378	–	int count = 0;
1379	–	for (Node[] tab = table;;) {
1380	–	int i; Node f; int fh; Object fk;
1381	–	if (tab == null)
1382	–	tab = initTable();
1383	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1384	–	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1385	–	break;                   // no lock when adding to empty bin
1386	–	}
1387	–	else if ((fh = f.hash) == MOVED) {
1388	–	if ((fk = f.key) instanceof TreeBin) {
1389	–	TreeBin t = (TreeBin)fk;
1390	–	Object oldVal = null;
1391	–	t.acquire(0);
1392	–	try {
1393	–	if (tabAt(tab, i) == f) {
1394	–	count = 2;
1395	–	TreeNode p = t.putTreeNode(h, k, v);
1396	–	if (p != null) {
1397	–	oldVal = p.val;
1398	–	p.val = v;
1399	–	}
1400	–	}
1401	–	} finally {
1402	–	t.release(0);
1403	–	}
1404	–	if (count != 0) {
1405	–	if (oldVal != null)
1406	–	return oldVal;
1407	–	break;
1408	–	}
1409	–	}
1410	–	else
1411	–	tab = (Node[])fk;
1412	–	}
1413	–	else if ((fh & LOCKED) != 0) {
1414	–	checkForResize();
1415	–	f.tryAwaitLock(tab, i);
1416	–	}
1417	–	else if (f.casHash(fh, fh | LOCKED)) {
1418	–	Object oldVal = null;
1419	–	try {                        // needed in case equals() throws
1420	–	if (tabAt(tab, i) == f) {
1421	–	count = 1;
1422	–	for (Node e = f;; ++count) {
1423	–	Object ek, ev;
1424	–	if ((e.hash & HASH_BITS) == h &&
1425	–	(ev = e.val) != null &&
1426	–	((ek = e.key) == k || k.equals(ek))) {
1427	–	oldVal = ev;
1428	–	e.val = v;
1429	–	break;
1430	–	}
1431	–	Node last = e;
1432	–	if ((e = e.next) == null) {
1433	–	last.next = new Node(h, k, v, null);
1434	–	if (count >= TREE_THRESHOLD)
1435	–	replaceWithTreeBin(tab, i, k);
1436	–	break;
1437	–	}
1438	–	}
1439	–	}
1440	–	} finally {                  // unlock and signal if needed
1441	–	if (!f.casHash(fh | LOCKED, fh)) {
1442	–	f.hash = fh;
1443	–	synchronized (f) { f.notifyAll(); };
1444	–	}
1445	–	}
1446	–	if (count != 0) {
1447	–	if (oldVal != null)
1448	–	return oldVal;
1449	–	if (tab.length <= 64)
1450	–	count = 2;
1451	–	break;
1452	–	}
1453	–	}
1454	–	}
1455	–	counter.add(1L);
1456	–	if (count > 1)
1457	–	checkForResize();
1458	–	return null;
1459	–	}
1460	–
1461	–	/** Implementation for putIfAbsent */
1462	–	private final Object internalPutIfAbsent(Object k, Object v) {
1463	–	int h = spread(k.hashCode());
1464	–	int count = 0;
1465	–	for (Node[] tab = table;;) {
1466	–	int i; Node f; int fh; Object fk, fv;
1467	–	if (tab == null)
1468	–	tab = initTable();
1469	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1470	–	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1471	–	break;
1472	–	}
1473	–	else if ((fh = f.hash) == MOVED) {
1474	–	if ((fk = f.key) instanceof TreeBin) {
1475	–	TreeBin t = (TreeBin)fk;
1476	–	Object oldVal = null;
1477	–	t.acquire(0);
1478	–	try {
1479	–	if (tabAt(tab, i) == f) {
1480	–	count = 2;
1481	–	TreeNode p = t.putTreeNode(h, k, v);
1482	–	if (p != null)
1483	–	oldVal = p.val;
1484	–	}
1485	–	} finally {
1486	–	t.release(0);
1487	–	}
1488	–	if (count != 0) {
1489	–	if (oldVal != null)
1490	–	return oldVal;
1491	–	break;
1492	–	}
1493	–	}
1494	–	else
1495	–	tab = (Node[])fk;
1496	–	}
1497	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1498	–	((fk = f.key) == k || k.equals(fk)))
1499	–	return fv;
1500	–	else {
1501	–	Node g = f.next;
1502	–	if (g != null) { // at least 2 nodes -- search and maybe resize
1503	–	for (Node e = g;;) {
1504	–	Object ek, ev;
1505	–	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1506	–	((ek = e.key) == k || k.equals(ek)))
1507	–	return ev;
1508	–	if ((e = e.next) == null) {
1509	–	checkForResize();
1510	–	break;
1511	–	}
1512	–	}
1513	–	}
1514	–	if (((fh = f.hash) & LOCKED) != 0) {
1515	–	checkForResize();
1516	–	f.tryAwaitLock(tab, i);
1517	–	}
1518	–	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1519	–	Object oldVal = null;
1520	–	try {
1521	–	if (tabAt(tab, i) == f) {
1522	–	count = 1;
1523	–	for (Node e = f;; ++count) {
1524	–	Object ek, ev;
1525	–	if ((e.hash & HASH_BITS) == h &&
1526	–	(ev = e.val) != null &&
1527	–	((ek = e.key) == k || k.equals(ek))) {
1528	–	oldVal = ev;
1529	–	break;
1530	–	}
1531	–	Node last = e;
1532	–	if ((e = e.next) == null) {
1533	–	last.next = new Node(h, k, v, null);
1534	–	if (count >= TREE_THRESHOLD)
1535	–	replaceWithTreeBin(tab, i, k);
1536	–	break;
1537	–	}
1538	–	}
1539	–	}
1540	–	} finally {
1541	–	if (!f.casHash(fh | LOCKED, fh)) {
1542	–	f.hash = fh;
1543	–	synchronized (f) { f.notifyAll(); };
1544	–	}
1545	–	}
1546	–	if (count != 0) {
1547	–	if (oldVal != null)
1548	–	return oldVal;
1549	–	if (tab.length <= 64)
1550	–	count = 2;
1551	–	break;
1552	–	}
1553	–	}
1554	–	}
1555	–	}
1556	–	counter.add(1L);
1557	–	if (count > 1)
1558	–	checkForResize();
1559	–	return null;
1560	–	}
1561	–
1562	–	/** Implementation for computeIfAbsent */
1563	–	private final Object internalComputeIfAbsent(K k,
1564	–	Fun<? super K, ?> mf) {
1565	–	int h = spread(k.hashCode());
1566	–	Object val = null;
1567	–	int count = 0;
1568	–	for (Node[] tab = table;;) {
1569	–	Node f; int i, fh; Object fk, fv;
1570	–	if (tab == null)
1571	–	tab = initTable();
1572	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1573	–	Node node = new Node(fh = h | LOCKED, k, null, null);
1574	–	if (casTabAt(tab, i, null, node)) {
1575	–	count = 1;
1576	–	try {
1577	–	if ((val = mf.apply(k)) != null)
1578	–	node.val = val;
1579	–	} finally {
1580	–	if (val == null)
1581	–	setTabAt(tab, i, null);
1582	–	if (!node.casHash(fh, h)) {
1583	–	node.hash = h;
1584	–	synchronized (node) { node.notifyAll(); };
1585	–	}
1586	–	}
1587	–	}
1588	–	if (count != 0)
1589	–	break;
1590	–	}
1591	–	else if ((fh = f.hash) == MOVED) {
1592	–	if ((fk = f.key) instanceof TreeBin) {
1593	–	TreeBin t = (TreeBin)fk;
1594	–	boolean added = false;
1595	–	t.acquire(0);
1596	–	try {
1597	–	if (tabAt(tab, i) == f) {
1598	–	count = 1;
1599	–	TreeNode p = t.getTreeNode(h, k, t.root);
1600	–	if (p != null)
1601	–	val = p.val;
1602	–	else if ((val = mf.apply(k)) != null) {
1603	–	added = true;
1604	–	count = 2;
1605	–	t.putTreeNode(h, k, val);
1606	–	}
1607	–	}
1608	–	} finally {
1609	–	t.release(0);
1610	–	}
1611	–	if (count != 0) {
1612	–	if (!added)
1613	–	return val;
1614	–	break;
1615	–	}
1616	–	}
1617	–	else
1618	–	tab = (Node[])fk;
1619	–	}
1620	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1621	–	((fk = f.key) == k || k.equals(fk)))
1622	–	return fv;
1623	–	else {
1624	–	Node g = f.next;
1625	–	if (g != null) {
1626	–	for (Node e = g;;) {
1627	–	Object ek, ev;
1628	–	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1629	–	((ek = e.key) == k || k.equals(ek)))
1630	–	return ev;
1631	–	if ((e = e.next) == null) {
1632	–	checkForResize();
1633	–	break;
1634	–	}
1635	–	}
1636	–	}
1637	–	if (((fh = f.hash) & LOCKED) != 0) {
1638	–	checkForResize();
1639	–	f.tryAwaitLock(tab, i);
1640	–	}
1641	–	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1642	–	boolean added = false;
1643	–	try {
1644	–	if (tabAt(tab, i) == f) {
1645	–	count = 1;
1646	–	for (Node e = f;; ++count) {
1647	–	Object ek, ev;
1648	–	if ((e.hash & HASH_BITS) == h &&
1649	–	(ev = e.val) != null &&
1650	–	((ek = e.key) == k || k.equals(ek))) {
1651	–	val = ev;
1652	–	break;
1653	–	}
1654	–	Node last = e;
1655	–	if ((e = e.next) == null) {
1656	–	if ((val = mf.apply(k)) != null) {
1657	–	added = true;
1658	–	last.next = new Node(h, k, val, null);
1659	–	if (count >= TREE_THRESHOLD)
1660	–	replaceWithTreeBin(tab, i, k);
1661	–	}
1662	–	break;
1663	–	}
1664	–	}
1665	–	}
1666	–	} finally {
1667	–	if (!f.casHash(fh | LOCKED, fh)) {
1668	–	f.hash = fh;
1669	–	synchronized (f) { f.notifyAll(); };
1670	–	}
1671	–	}
1672	–	if (count != 0) {
1673	–	if (!added)
1674	–	return val;
1675	–	if (tab.length <= 64)
1676	–	count = 2;
1677	–	break;
1678	–	}
1679	–	}
1680	–	}
1681	–	}
1682	–	if (val != null) {
1683	–	counter.add(1L);
1684	–	if (count > 1)
1685	–	checkForResize();
1686	–	}
1687	–	return val;
1688	–	}
1689	–
1690	–	/** Implementation for compute */
1691	–	@SuppressWarnings("unchecked") private final Object internalCompute
1692	–	(K k, boolean onlyIfPresent, BiFun<? super K, ? super V, ? extends V> mf) {
1693	–	int h = spread(k.hashCode());
1694	–	Object val = null;
1695	–	int delta = 0;
1696	–	int count = 0;
1697	–	for (Node[] tab = table;;) {
1698	–	Node f; int i, fh; Object fk;
1699	–	if (tab == null)
1700	–	tab = initTable();
1701	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1702	–	if (onlyIfPresent)
1703	–	break;
1704	–	Node node = new Node(fh = h | LOCKED, k, null, null);
1705	–	if (casTabAt(tab, i, null, node)) {
1706	–	try {
1707	–	count = 1;
1708	–	if ((val = mf.apply(k, null)) != null) {
1709	–	node.val = val;
1710	–	delta = 1;
1711	–	}
1712	–	} finally {
1713	–	if (delta == 0)
1714	–	setTabAt(tab, i, null);
1715	–	if (!node.casHash(fh, h)) {
1716	–	node.hash = h;
1717	–	synchronized (node) { node.notifyAll(); };
1718	–	}
1719	–	}
1720	–	}
1721	–	if (count != 0)
1722	–	break;
1723	–	}
1724	–	else if ((fh = f.hash) == MOVED) {
1725	–	if ((fk = f.key) instanceof TreeBin) {
1726	–	TreeBin t = (TreeBin)fk;
1727	–	t.acquire(0);
1728	–	try {
1729	–	if (tabAt(tab, i) == f) {
1730	–	count = 1;
1731	–	TreeNode p = t.getTreeNode(h, k, t.root);
1732	–	Object pv = (p == null) ? null : p.val;
1733	–	if ((val = mf.apply(k, (V)pv)) != null) {
1734	–	if (p != null)
1735	–	p.val = val;
1736	–	else {
1737	–	count = 2;
1738	–	delta = 1;
1739	–	t.putTreeNode(h, k, val);
1740	–	}
1741	–	}
1742	–	else if (p != null) {
1743	–	delta = -1;
1744	–	t.deleteTreeNode(p);
1745	–	}
1746	–	}
1747	–	} finally {
1748	–	t.release(0);
1749	–	}
1750	–	if (count != 0)
1751	–	break;
1752	–	}
1753	–	else
1754	–	tab = (Node[])fk;
1755	–	}
1756	–	else if ((fh & LOCKED) != 0) {
1757	–	checkForResize();
1758	–	f.tryAwaitLock(tab, i);
1759	–	}
1760	–	else if (f.casHash(fh, fh | LOCKED)) {
1761	–	try {
1762	–	if (tabAt(tab, i) == f) {
1763	–	count = 1;
1764	–	for (Node e = f, pred = null;; ++count) {
1765	–	Object ek, ev;
1766	–	if ((e.hash & HASH_BITS) == h &&
1767	–	(ev = e.val) != null &&
1768	–	((ek = e.key) == k || k.equals(ek))) {
1769	–	val = mf.apply(k, (V)ev);
1770	–	if (val != null)
1771	–	e.val = val;
1772	–	else {
1773	–	delta = -1;
1774	–	Node en = e.next;
1775	–	if (pred != null)
1776	–	pred.next = en;
1777	–	else
1778	–	setTabAt(tab, i, en);
1779	–	}
1780	–	break;
1781	–	}
1782	–	pred = e;
1783	–	if ((e = e.next) == null) {
1784	–	if (!onlyIfPresent && (val = mf.apply(k, null)) != null) {
1785	–	pred.next = new Node(h, k, val, null);
1786	–	delta = 1;
1787	–	if (count >= TREE_THRESHOLD)
1788	–	replaceWithTreeBin(tab, i, k);
1789	–	}
1790	–	break;
1791	–	}
1792	–	}
1793	–	}
1794	–	} finally {
1795	–	if (!f.casHash(fh | LOCKED, fh)) {
1796	–	f.hash = fh;
1797	–	synchronized (f) { f.notifyAll(); };
1798	–	}
1799	–	}
1800	–	if (count != 0) {
1801	–	if (tab.length <= 64)
1802	–	count = 2;
1803	–	break;
1804	–	}
1805	–	}
1806	–	}
1807	–	if (delta != 0) {
1808	–	counter.add((long)delta);
1809	–	if (count > 1)
1810	–	checkForResize();
1811	–	}
1812	–	return val;
1813	–	}
1814	–
1815	–	/** Implementation for merge */
1816	–	@SuppressWarnings("unchecked") private final Object internalMerge
1817	–	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
1818	–	int h = spread(k.hashCode());
1819	–	Object val = null;
1820	–	int delta = 0;
1821	–	int count = 0;
1822	–	for (Node[] tab = table;;) {
1823	–	int i; Node f; int fh; Object fk, fv;
1824	–	if (tab == null)
1825	–	tab = initTable();
1826	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1827	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1828	–	delta = 1;
1829	–	val = v;
1830	–	break;
1831	–	}
1832	–	}
1833	–	else if ((fh = f.hash) == MOVED) {
1834	–	if ((fk = f.key) instanceof TreeBin) {
1835	–	TreeBin t = (TreeBin)fk;
1836	–	t.acquire(0);
1837	–	try {
1838	–	if (tabAt(tab, i) == f) {
1839	–	count = 1;
1840	–	TreeNode p = t.getTreeNode(h, k, t.root);
1841	–	val = (p == null) ? v : mf.apply((V)p.val, v);
1842	–	if (val != null) {
1843	–	if (p != null)
1844	–	p.val = val;
1845	–	else {
1846	–	count = 2;
1847	–	delta = 1;
1848	–	t.putTreeNode(h, k, val);
1849	–	}
1850	–	}
1851	–	else if (p != null) {
1852	–	delta = -1;
1853	–	t.deleteTreeNode(p);
1854	–	}
1855	–	}
1856	–	} finally {
1857	–	t.release(0);
1858	–	}
1859	–	if (count != 0)
1860	–	break;
1861	–	}
1862	–	else
1863	–	tab = (Node[])fk;
1864	–	}
1865	–	else if ((fh & LOCKED) != 0) {
1866	–	checkForResize();
1867	–	f.tryAwaitLock(tab, i);
1868	–	}
1869	–	else if (f.casHash(fh, fh | LOCKED)) {
1870	–	try {
1871	–	if (tabAt(tab, i) == f) {
1872	–	count = 1;
1873	–	for (Node e = f, pred = null;; ++count) {
1874	–	Object ek, ev;
1875	–	if ((e.hash & HASH_BITS) == h &&
1876	–	(ev = e.val) != null &&
1877	–	((ek = e.key) == k || k.equals(ek))) {
1878	–	val = mf.apply(v, (V)ev);
1879	–	if (val != null)
1880	–	e.val = val;
1881	–	else {
1882	–	delta = -1;
1883	–	Node en = e.next;
1884	–	if (pred != null)
1885	–	pred.next = en;
1886	–	else
1887	–	setTabAt(tab, i, en);
1888	–	}
1889	–	break;
1890	–	}
1891	–	pred = e;
1892	–	if ((e = e.next) == null) {
1893	–	val = v;
1894	–	pred.next = new Node(h, k, val, null);
1895	–	delta = 1;
1896	–	if (count >= TREE_THRESHOLD)
1897	–	replaceWithTreeBin(tab, i, k);
1898	–	break;
1899	–	}
1900	–	}
1901	–	}
1902	–	} finally {
1903	–	if (!f.casHash(fh | LOCKED, fh)) {
1904	–	f.hash = fh;
1905	–	synchronized (f) { f.notifyAll(); };
1906	–	}
1907	–	}
1908	–	if (count != 0) {
1909	–	if (tab.length <= 64)
1910	–	count = 2;
1911	–	break;
1912	–	}
1913	–	}
1914	–	}
1915	–	if (delta != 0) {
1916	–	counter.add((long)delta);
1917	–	if (count > 1)
1918	–	checkForResize();
1919	–	}
1920	–	return val;
1921	–	}
1922	–
1923	–	/** Implementation for putAll */
1924	–	private final void internalPutAll(Map<?, ?> m) {
1925	–	tryPresize(m.size());
1926	–	long delta = 0L;     // number of uncommitted additions
1927	–	boolean npe = false; // to throw exception on exit for nulls
1928	–	try {                // to clean up counts on other exceptions
1929	–	for (Map.Entry<?, ?> entry : m.entrySet()) {
1930	–	Object k, v;
1931	–	if (entry == null || (k = entry.getKey()) == null ||
1932	–	(v = entry.getValue()) == null) {
1933	–	npe = true;
1934	–	break;
1935	–	}
1936	–	int h = spread(k.hashCode());
1937	–	for (Node[] tab = table;;) {
1938	–	int i; Node f; int fh; Object fk;
1939	–	if (tab == null)
1940	–	tab = initTable();
1941	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
1942	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1943	–	++delta;
1944	–	break;
1945	–	}
1946	–	}
1947	–	else if ((fh = f.hash) == MOVED) {
1948	–	if ((fk = f.key) instanceof TreeBin) {
1949	–	TreeBin t = (TreeBin)fk;
1950	–	boolean validated = false;
1951	–	t.acquire(0);
1952	–	try {
1953	–	if (tabAt(tab, i) == f) {
1954	–	validated = true;
1955	–	TreeNode p = t.getTreeNode(h, k, t.root);
1956	–	if (p != null)
1957	–	p.val = v;
1958	–	else {
1959	–	t.putTreeNode(h, k, v);
1960	–	++delta;
1961	–	}
1962	–	}
1963	–	} finally {
1964	–	t.release(0);
1965	–	}
1966	–	if (validated)
1967	–	break;
1968	–	}
1969	–	else
1970	–	tab = (Node[])fk;
1971	–	}
1972	–	else if ((fh & LOCKED) != 0) {
1973	–	counter.add(delta);
1974	–	delta = 0L;
1975	–	checkForResize();
1976	–	f.tryAwaitLock(tab, i);
1977	–	}
1978	–	else if (f.casHash(fh, fh | LOCKED)) {
1979	–	int count = 0;
1980	–	try {
1981	–	if (tabAt(tab, i) == f) {
1982	–	count = 1;
1983	–	for (Node e = f;; ++count) {
1984	–	Object ek, ev;
1985	–	if ((e.hash & HASH_BITS) == h &&
1986	–	(ev = e.val) != null &&
1987	–	((ek = e.key) == k || k.equals(ek))) {
1988	–	e.val = v;
1989	–	break;
1990	–	}
1991	–	Node last = e;
1992	–	if ((e = e.next) == null) {
1993	–	++delta;
1994	–	last.next = new Node(h, k, v, null);
1995	–	if (count >= TREE_THRESHOLD)
1996	–	replaceWithTreeBin(tab, i, k);
1997	–	break;
1998	–	}
1999	–	}
2000	–	}
2001	–	} finally {
2002	–	if (!f.casHash(fh | LOCKED, fh)) {
2003	–	f.hash = fh;
2004	–	synchronized (f) { f.notifyAll(); };
2005	–	}
2006	–	}
2007	–	if (count != 0) {
2008	–	if (count > 1) {
2009	–	counter.add(delta);
2010	–	delta = 0L;
2011	–	checkForResize();
2012	–	}
2013	–	break;
2014	–	}
2015	–	}
2016	–	}
2017	–	}
2018	–	} finally {
2019	–	if (delta != 0)
2020	–	counter.add(delta);
2021	–	}
2022	–	if (npe)
2023	–	throw new NullPointerException();
2024	–	}
2025	–
2026	–	/* ---------------- Table Initialization and Resizing -------------- */
2027	–
2028	–	/**
679		* Returns a power of two table size for the given desired capacity.
680		* See Hackers Delight, sec 3.2
681		*/
#	Line 2040 | Line 690 | public class ConcurrentHashMapV8<K, V>
690		}
691
692		/**
693	<	* Initializes table, using the size recorded in sizeCtl.
693	>	* Returns x's Class if it is of the form "class C implements
694	>	* Comparable<C>", else null.
695		*/
696	<	private final Node[] initTable() {
697	<	Node[] tab; int sc;
698	<	while ((tab = table) == null) {
699	<	if ((sc = sizeCtl) < 0)
700	<	Thread.yield(); // lost initialization race; just spin
701	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
702	<	try {
703	<	if ((tab = table) == null) {
704	<	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
705	<	tab = table = new Node[n];
706	<	sc = n - (n >>> 2);
707	<	}
708	<	} finally {
2058	<	sizeCtl = sc;
2059	<	}
2060	<	break;
2061	<	}
2062	<	}
2063	<	return tab;
2064	<	}
2065	<
2066	<	/**
2067	<	* If table is too small and not already resizing, creates next
2068	<	* table and transfers bins.  Rechecks occupancy after a transfer
2069	<	* to see if another resize is already needed because resizings
2070	<	* are lagging additions.
2071	<	*/
2072	<	private final void checkForResize() {
2073	<	Node[] tab; int n, sc;
2074	<	while ((tab = table) != null &&
2075	<	(n = tab.length) < MAXIMUM_CAPACITY &&
2076	<	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
2077	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2078	<	try {
2079	<	if (tab == table) {
2080	<	table = rebuild(tab);
2081	<	sc = (n << 1) - (n >>> 1);
696	>	static Class<?> comparableClassFor(Object x) {
697	>	if (x instanceof Comparable) {
698	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
699	>	if ((c = x.getClass()) == String.class) // bypass checks
700	>	return c;
701	>	if ((ts = c.getGenericInterfaces()) != null) {
702	>	for (int i = 0; i < ts.length; ++i) {
703	>	if (((t = ts[i]) instanceof ParameterizedType) &&
704	>	((p = (ParameterizedType)t).getRawType() ==
705	>	Comparable.class) &&
706	>	(as = p.getActualTypeArguments()) != null &&
707	>	as.length == 1 && as[0] == c) // type arg is c
708	>	return c;
709		}
2083	–	} finally {
2084	–	sizeCtl = sc;
710		}
711		}
712	+	return null;
713		}
714
715		/**
716	<	* Tries to presize table to accommodate the given number of elements.
717	<	*
2092	<	* @param size number of elements (doesn't need to be perfectly accurate)
716	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
717	>	* class), else 0.
718		*/
719	<	private final void tryPresize(int size) {
720	<	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
721	<	tableSizeFor(size + (size >>> 1) + 1);
722	<	int sc;
2098	<	while ((sc = sizeCtl) >= 0) {
2099	<	Node[] tab = table; int n;
2100	<	if (tab == null || (n = tab.length) == 0) {
2101	<	n = (sc > c) ? sc : c;
2102	<	if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2103	<	try {
2104	<	if (table == tab) {
2105	<	table = new Node[n];
2106	<	sc = n - (n >>> 2);
2107	<	}
2108	<	} finally {
2109	<	sizeCtl = sc;
2110	<	}
2111	<	}
2112	<	}
2113	<	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2114	<	break;
2115	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2116	<	try {
2117	<	if (table == tab) {
2118	<	table = rebuild(tab);
2119	<	sc = (n << 1) - (n >>> 1);
2120	<	}
2121	<	} finally {
2122	<	sizeCtl = sc;
2123	<	}
2124	<	}
2125	<	}
719	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
720	>	static int compareComparables(Class<?> kc, Object k, Object x) {
721	>	return (x == null || x.getClass() != kc ? 0 :
722	>	((Comparable)k).compareTo(x));
723		}
724
725	+	/* ---------------- Table element access -------------- */
726	+
727		/*
728	<	* Moves and/or copies the nodes in each bin to new table. See
729	<	* above for explanation.
730	<	*
731	<	* @return the new table
732	<	*/
733	<	private static final Node[] rebuild(Node[] tab) {
734	<	int n = tab.length;
735	<	Node[] nextTab = new Node[n << 1];
736	<	Node fwd = new Node(MOVED, nextTab, null, null);
737	<	int[] buffer = null;       // holds bins to revisit; null until needed
738	<	Node rev = null;           // reverse forwarder; null until needed
739	<	int nbuffered = 0;         // the number of bins in buffer list
740	<	int bufferIndex = 0;       // buffer index of current buffered bin
741	<	int bin = n - 1;           // current non-buffered bin or -1 if none
742	<
743	<	for (int i = bin;;) {      // start upwards sweep
744	<	int fh; Node f;
745	<	if ((f = tabAt(tab, i)) == null) {
746	<	if (bin >= 0) {    // Unbuffered; no lock needed (or available)
747	<	if (!casTabAt(tab, i, f, fwd))
748	<	continue;
749	<	}
750	<	else {             // transiently use a locked forwarding node
2152	<	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
2153	<	if (!casTabAt(tab, i, f, g))
2154	<	continue;
2155	<	setTabAt(nextTab, i, null);
2156	<	setTabAt(nextTab, i + n, null);
2157	<	setTabAt(tab, i, fwd);
2158	<	if (!g.casHash(MOVED|LOCKED, MOVED)) {
2159	<	g.hash = MOVED;
2160	<	synchronized (g) { g.notifyAll(); }
2161	<	}
2162	<	}
2163	<	}
2164	<	else if ((fh = f.hash) == MOVED) {
2165	<	Object fk = f.key;
2166	<	if (fk instanceof TreeBin) {
2167	<	TreeBin t = (TreeBin)fk;
2168	<	boolean validated = false;
2169	<	t.acquire(0);
2170	<	try {
2171	<	if (tabAt(tab, i) == f) {
2172	<	validated = true;
2173	<	splitTreeBin(nextTab, i, t);
2174	<	setTabAt(tab, i, fwd);
2175	<	}
2176	<	} finally {
2177	<	t.release(0);
2178	<	}
2179	<	if (!validated)
2180	<	continue;
2181	<	}
2182	<	}
2183	<	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
2184	<	boolean validated = false;
2185	<	try {              // split to lo and hi lists; copying as needed
2186	<	if (tabAt(tab, i) == f) {
2187	<	validated = true;
2188	<	splitBin(nextTab, i, f);
2189	<	setTabAt(tab, i, fwd);
2190	<	}
2191	<	} finally {
2192	<	if (!f.casHash(fh | LOCKED, fh)) {
2193	<	f.hash = fh;
2194	<	synchronized (f) { f.notifyAll(); };
2195	<	}
2196	<	}
2197	<	if (!validated)
2198	<	continue;
2199	<	}
2200	<	else {
2201	<	if (buffer == null) // initialize buffer for revisits
2202	<	buffer = new int[TRANSFER_BUFFER_SIZE];
2203	<	if (bin < 0 && bufferIndex > 0) {
2204	<	int j = buffer[--bufferIndex];
2205	<	buffer[bufferIndex] = i;
2206	<	i = j;         // swap with another bin
2207	<	continue;
2208	<	}
2209	<	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
2210	<	f.tryAwaitLock(tab, i);
2211	<	continue;      // no other options -- block
2212	<	}
2213	<	if (rev == null)   // initialize reverse-forwarder
2214	<	rev = new Node(MOVED, tab, null, null);
2215	<	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
2216	<	continue;      // recheck before adding to list
2217	<	buffer[nbuffered++] = i;
2218	<	setTabAt(nextTab, i, rev);     // install place-holders
2219	<	setTabAt(nextTab, i + n, rev);
2220	<	}
2221	<
2222	<	if (bin > 0)
2223	<	i = --bin;
2224	<	else if (buffer != null && nbuffered > 0) {
2225	<	bin = -1;
2226	<	i = buffer[bufferIndex = --nbuffered];
2227	<	}
2228	<	else
2229	<	return nextTab;
2230	<	}
728	>	* Volatile access methods are used for table elements as well as
729	>	* elements of in-progress next table while resizing.  All uses of
730	>	* the tab arguments must be null checked by callers.  All callers
731	>	* also paranoically precheck that tab's length is not zero (or an
732	>	* equivalent check), thus ensuring that any index argument taking
733	>	* the form of a hash value anded with (length - 1) is a valid
734	>	* index.  Note that, to be correct wrt arbitrary concurrency
735	>	* errors by users, these checks must operate on local variables,
736	>	* which accounts for some odd-looking inline assignments below.
737	>	* Note that calls to setTabAt always occur within locked regions,
738	>	* and so in principle require only release ordering, not need
739	>	* full volatile semantics, but are currently coded as volatile
740	>	* writes to be conservative.
741	>	*/
742	>
743	>	@SuppressWarnings("unchecked")
744	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
745	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
746	>	}
747	>
748	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
749	>	Node<K,V> c, Node<K,V> v) {
750	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
751		}
752
753	<	/**
754	<	* Splits a normal bin with list headed by e into lo and hi parts;
2235	<	* installs in given table.
2236	<	*/
2237	<	private static void splitBin(Node[] nextTab, int i, Node e) {
2238	<	int bit = nextTab.length >>> 1; // bit to split on
2239	<	int runBit = e.hash & bit;
2240	<	Node lastRun = e, lo = null, hi = null;
2241	<	for (Node p = e.next; p != null; p = p.next) {
2242	<	int b = p.hash & bit;
2243	<	if (b != runBit) {
2244	<	runBit = b;
2245	<	lastRun = p;
2246	<	}
2247	<	}
2248	<	if (runBit == 0)
2249	<	lo = lastRun;
2250	<	else
2251	<	hi = lastRun;
2252	<	for (Node p = e; p != lastRun; p = p.next) {
2253	<	int ph = p.hash & HASH_BITS;
2254	<	Object pk = p.key, pv = p.val;
2255	<	if ((ph & bit) == 0)
2256	<	lo = new Node(ph, pk, pv, lo);
2257	<	else
2258	<	hi = new Node(ph, pk, pv, hi);
2259	<	}
2260	<	setTabAt(nextTab, i, lo);
2261	<	setTabAt(nextTab, i + bit, hi);
753	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
754	>	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
755		}
756
757	+	/* ---------------- Fields -------------- */
758	+
759		/**
760	<	* Splits a tree bin into lo and hi parts; installs in given table.
760	>	* The array of bins. Lazily initialized upon first insertion.
761	>	* Size is always a power of two. Accessed directly by iterators.
762		*/
763	<	private static void splitTreeBin(Node[] nextTab, int i, TreeBin t) {
2268	<	int bit = nextTab.length >>> 1;
2269	<	TreeBin lt = new TreeBin();
2270	<	TreeBin ht = new TreeBin();
2271	<	int lc = 0, hc = 0;
2272	<	for (Node e = t.first; e != null; e = e.next) {
2273	<	int h = e.hash & HASH_BITS;
2274	<	Object k = e.key, v = e.val;
2275	<	if ((h & bit) == 0) {
2276	<	++lc;
2277	<	lt.putTreeNode(h, k, v);
2278	<	}
2279	<	else {
2280	<	++hc;
2281	<	ht.putTreeNode(h, k, v);
2282	<	}
2283	<	}
2284	<	Node ln, hn; // throw away trees if too small
2285	<	if (lc <= (TREE_THRESHOLD >>> 1)) {
2286	<	ln = null;
2287	<	for (Node p = lt.first; p != null; p = p.next)
2288	<	ln = new Node(p.hash, p.key, p.val, ln);
2289	<	}
2290	<	else
2291	<	ln = new Node(MOVED, lt, null, null);
2292	<	setTabAt(nextTab, i, ln);
2293	<	if (hc <= (TREE_THRESHOLD >>> 1)) {
2294	<	hn = null;
2295	<	for (Node p = ht.first; p != null; p = p.next)
2296	<	hn = new Node(p.hash, p.key, p.val, hn);
2297	<	}
2298	<	else
2299	<	hn = new Node(MOVED, ht, null, null);
2300	<	setTabAt(nextTab, i + bit, hn);
2301	<	}
763	>	transient volatile Node<K,V>[] table;
764
765		/**
766	<	* Implementation for clear. Steps through each bin, removing all
2305	<	* nodes.
766	>	* The next table to use; non-null only while resizing.
767		*/
768	<	private final void internalClear() {
2308	<	long delta = 0L; // negative number of deletions
2309	<	int i = 0;
2310	<	Node[] tab = table;
2311	<	while (tab != null && i < tab.length) {
2312	<	int fh; Object fk;
2313	<	Node f = tabAt(tab, i);
2314	<	if (f == null)
2315	<	++i;
2316	<	else if ((fh = f.hash) == MOVED) {
2317	<	if ((fk = f.key) instanceof TreeBin) {
2318	<	TreeBin t = (TreeBin)fk;
2319	<	t.acquire(0);
2320	<	try {
2321	<	if (tabAt(tab, i) == f) {
2322	<	for (Node p = t.first; p != null; p = p.next) {
2323	<	if (p.val != null) { // (currently always true)
2324	<	p.val = null;
2325	<	--delta;
2326	<	}
2327	<	}
2328	<	t.first = null;
2329	<	t.root = null;
2330	<	++i;
2331	<	}
2332	<	} finally {
2333	<	t.release(0);
2334	<	}
2335	<	}
2336	<	else
2337	<	tab = (Node[])fk;
2338	<	}
2339	<	else if ((fh & LOCKED) != 0) {
2340	<	counter.add(delta); // opportunistically update count
2341	<	delta = 0L;
2342	<	f.tryAwaitLock(tab, i);
2343	<	}
2344	<	else if (f.casHash(fh, fh | LOCKED)) {
2345	<	try {
2346	<	if (tabAt(tab, i) == f) {
2347	<	for (Node e = f; e != null; e = e.next) {
2348	<	if (e.val != null) {  // (currently always true)
2349	<	e.val = null;
2350	<	--delta;
2351	<	}
2352	<	}
2353	<	setTabAt(tab, i, null);
2354	<	++i;
2355	<	}
2356	<	} finally {
2357	<	if (!f.casHash(fh | LOCKED, fh)) {
2358	<	f.hash = fh;
2359	<	synchronized (f) { f.notifyAll(); };
2360	<	}
2361	<	}
2362	<	}
2363	<	}
2364	<	if (delta != 0)
2365	<	counter.add(delta);
2366	<	}
2367	<
2368	<	/* ----------------Table Traversal -------------- */
768	>	private transient volatile Node<K,V>[] nextTable;
769
770		/**
771	<	* Encapsulates traversal for methods such as containsValue; also
772	<	* serves as a base class for other iterators and bulk tasks.
773	<	*
774	<	* At each step, the iterator snapshots the key ("nextKey") and
775	<	* value ("nextVal") of a valid node (i.e., one that, at point of
2376	<	* snapshot, has a non-null user value). Because val fields can
2377	<	* change (including to null, indicating deletion), field nextVal
2378	<	* might not be accurate at point of use, but still maintains the
2379	<	* weak consistency property of holding a value that was once
2380	<	* valid. To support iterator.remove, the nextKey field is not
2381	<	* updated (nulled out) when the iterator cannot advance.
2382	<	*
2383	<	* Internal traversals directly access these fields, as in:
2384	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2385	<	*
2386	<	* Exported iterators must track whether the iterator has advanced
2387	<	* (in hasNext vs next) (by setting/checking/nulling field
2388	<	* nextVal), and then extract key, value, or key-value pairs as
2389	<	* return values of next().
2390	<	*
2391	<	* The iterator visits once each still-valid node that was
2392	<	* reachable upon iterator construction. It might miss some that
2393	<	* were added to a bin after the bin was visited, which is OK wrt
2394	<	* consistency guarantees. Maintaining this property in the face
2395	<	* of possible ongoing resizes requires a fair amount of
2396	<	* bookkeeping state that is difficult to optimize away amidst
2397	<	* volatile accesses.  Even so, traversal maintains reasonable
2398	<	* throughput.
2399	<	*
2400	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2401	<	* However, if the table has been resized, then all future steps
2402	<	* must traverse both the bin at the current index as well as at
2403	<	* (index + baseSize); and so on for further resizings. To
2404	<	* paranoically cope with potential sharing by users of iterators
2405	<	* across threads, iteration terminates if a bounds checks fails
2406	<	* for a table read.
2407	<	*
2408	<	* This class extends CountedCompleter to streamline parallel
2409	<	* iteration in bulk operations. This adds only a few fields of
2410	<	* space overhead, which is small enough in cases where it is not
2411	<	* needed to not worry about it.  Because CountedCompleter is
2412	<	* Serializable, but iterators need not be, we need to add warning
2413	<	* suppressions.
2414	<	*/
2415	<	@SuppressWarnings("serial") static class Traverser<K,V,R> extends CountedCompleter<R> {
2416	<	final ConcurrentHashMapV8<K, V> map;
2417	<	Node next;           // the next entry to use
2418	<	Object nextKey;      // cached key field of next
2419	<	Object nextVal;      // cached val field of next
2420	<	Node[] tab;          // current table; updated if resized
2421	<	int index;           // index of bin to use next
2422	<	int baseIndex;       // current index of initial table
2423	<	int baseLimit;       // index bound for initial table
2424	<	int baseSize;        // initial table size
2425	<	int batch;           // split control
2426	<
2427	<	/** Creates iterator for all entries in the table. */
2428	<	Traverser(ConcurrentHashMapV8<K, V> map) {
2429	<	this.map = map;
2430	<	}
2431	<
2432	<	/** Creates iterator for split() methods and task constructors */
2433	<	Traverser(ConcurrentHashMapV8<K,V> map, Traverser<K,V,?> it, int batch) {
2434	<	super(it);
2435	<	this.batch = batch;
2436	<	if ((this.map = map) != null && it != null) { // split parent
2437	<	Node[] t;
2438	<	if ((t = it.tab) == null &&
2439	<	(t = it.tab = map.table) != null)
2440	<	it.baseLimit = it.baseSize = t.length;
2441	<	this.tab = t;
2442	<	this.baseSize = it.baseSize;
2443	<	int hi = this.baseLimit = it.baseLimit;
2444	<	it.baseLimit = this.index = this.baseIndex =
2445	<	(hi + it.baseIndex + 1) >>> 1;
2446	<	}
2447	<	}
2448	<
2449	<	/**
2450	<	* Advances next; returns nextVal or null if terminated.
2451	<	* See above for explanation.
2452	<	*/
2453	<	final Object advance() {
2454	<	Node e = next;
2455	<	Object ev = null;
2456	<	outer: do {
2457	<	if (e != null)                  // advance past used/skipped node
2458	<	e = e.next;
2459	<	while (e == null) {             // get to next non-null bin
2460	<	ConcurrentHashMapV8<K, V> m;
2461	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2462	<	if ((t = tab) != null)
2463	<	n = t.length;
2464	<	else if ((m = map) != null && (t = tab = m.table) != null)
2465	<	n = baseLimit = baseSize = t.length;
2466	<	else
2467	<	break outer;
2468	<	if ((b = baseIndex) >= baseLimit ||
2469	<	(i = index) < 0 || i >= n)
2470	<	break outer;
2471	<	if ((e = tabAt(t, i)) != null && e.hash == MOVED) {
2472	<	if ((ek = e.key) instanceof TreeBin)
2473	<	e = ((TreeBin)ek).first;
2474	<	else {
2475	<	tab = (Node[])ek;
2476	<	continue;           // restarts due to null val
2477	<	}
2478	<	}                           // visit upper slots if present
2479	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2480	<	}
2481	<	nextKey = e.key;
2482	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2483	<	next = e;
2484	<	return nextVal = ev;
2485	<	}
771	>	* Base counter value, used mainly when there is no contention,
772	>	* but also as a fallback during table initialization
773	>	* races. Updated via CAS.
774	>	*/
775	>	private transient volatile long baseCount;
776
777	<	public final void remove() {
778	<	Object k = nextKey;
779	<	if (k == null && (advance() == null || (k = nextKey) == null))
780	<	throw new IllegalStateException();
781	<	map.internalReplace(k, null, null);
782	<	}
777	>	/**
778	>	* Table initialization and resizing control.  When negative, the
779	>	* table is being initialized or resized: -1 for initialization,
780	>	* else -(1 + the number of active resizing threads).  Otherwise,
781	>	* when table is null, holds the initial table size to use upon
782	>	* creation, or 0 for default. After initialization, holds the
783	>	* next element count value upon which to resize the table.
784	>	*/
785	>	private transient volatile int sizeCtl;
786
787	<	public final boolean hasNext() {
788	<	return nextVal != null || advance() != null;
789	<	}
787	>	/**
788	>	* The next table index (plus one) to split while resizing.
789	>	*/
790	>	private transient volatile int transferIndex;
791
792	<	public final boolean hasMoreElements() { return hasNext(); }
792	>	/**
793	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
794	>	*/
795	>	private transient volatile int cellsBusy;
796
797	<	public void compute() { } // default no-op CountedCompleter body
797	>	/**
798	>	* Table of counter cells. When non-null, size is a power of 2.
799	>	*/
800	>	private transient volatile CounterCell[] counterCells;
801
802	<	/**
803	<	* Returns a batch value > 0 if this task should (and must) be
804	<	* split, if so, adding to pending count, and in any case
805	<	* updating batch value. The initial batch value is approx
2506	<	* exp2 of the number of times (minus one) to split task by
2507	<	* two before executing leaf action. This value is faster to
2508	<	* compute and more convenient to use as a guide to splitting
2509	<	* than is the depth, since it is used while dividing by two
2510	<	* anyway.
2511	<	*/
2512	<	final int preSplit() {
2513	<	ConcurrentHashMapV8<K, V> m; int b; Node[] t;  ForkJoinPool pool;
2514	<	if ((b = batch) < 0 && (m = map) != null) { // force initialization
2515	<	if ((t = tab) == null && (t = tab = m.table) != null)
2516	<	baseLimit = baseSize = t.length;
2517	<	if (t != null) {
2518	<	long n = m.counter.sum();
2519	<	int par = ((pool = getPool()) == null) ?
2520	<	ForkJoinPool.getCommonPoolParallelism() :
2521	<	pool.getParallelism();
2522	<	int sp = par << 3; // slack of 8
2523	<	b = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
2524	<	}
2525	<	}
2526	<	b = (b <= 1 || baseIndex == baseLimit) ? 0 : (b >>> 1);
2527	<	if ((batch = b) > 0)
2528	<	addToPendingCount(1);
2529	<	return b;
2530	<	}
802	>	// views
803	>	private transient KeySetView<K,V> keySet;
804	>	private transient ValuesView<K,V> values;
805	>	private transient EntrySetView<K,V> entrySet;
806
2532	–	}
807
808		/* ---------------- Public operations -------------- */
809
#	Line 2537 | Line 811 | public class ConcurrentHashMapV8<K, V>
811		* Creates a new, empty map with the default initial table size (16).
812		*/
813		public ConcurrentHashMapV8() {
2540	–	this.counter = new LongAdder();
814		}
815
816		/**
#	Line 2556 | Line 829 | public class ConcurrentHashMapV8<K, V>
829		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
830		MAXIMUM_CAPACITY :
831		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2559	–	this.counter = new LongAdder();
832		this.sizeCtl = cap;
833		}
834
#	Line 2566 | Line 838 | public class ConcurrentHashMapV8<K, V>
838		* @param m the map
839		*/
840		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2569	–	this.counter = new LongAdder();
841		this.sizeCtl = DEFAULT_CAPACITY;
842	<	internalPutAll(m);
842	>	putAll(m);
843		}
844
845		/**
#	Line 2609 | Line 880 | public class ConcurrentHashMapV8<K, V>
880		* nonpositive
881		*/
882		public ConcurrentHashMapV8(int initialCapacity,
883	<	float loadFactor, int concurrencyLevel) {
883	>	float loadFactor, int concurrencyLevel) {
884		if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
885		throw new IllegalArgumentException();
886		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
#	Line 2617 | Line 888 | public class ConcurrentHashMapV8<K, V>
888		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
889		int cap = (size >= (long)MAXIMUM_CAPACITY) ?
890		MAXIMUM_CAPACITY : tableSizeFor((int)size);
2620	–	this.counter = new LongAdder();
891		this.sizeCtl = cap;
892		}
893
894	<	/**
2625	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2626	<	* from the given type to {@code Boolean.TRUE}.
2627	<	*
2628	<	* @return the new set
2629	<	*/
2630	<	public static <K> KeySetView<K,Boolean> newKeySet() {
2631	<	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(),
2632	<	Boolean.TRUE);
2633	<	}
2634	<
2635	<	/**
2636	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2637	<	* from the given type to {@code Boolean.TRUE}.
2638	<	*
2639	<	* @param initialCapacity The implementation performs internal
2640	<	* sizing to accommodate this many elements.
2641	<	* @throws IllegalArgumentException if the initial capacity of
2642	<	* elements is negative
2643	<	* @return the new set
2644	<	*/
2645	<	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2646	<	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(initialCapacity),
2647	<	Boolean.TRUE);
2648	<	}
2649	<
2650	<	/**
2651	<	* {@inheritDoc}
2652	<	*/
2653	<	public boolean isEmpty() {
2654	<	return counter.sum() <= 0L; // ignore transient negative values
2655	<	}
894	>	// Original (since JDK1.2) Map methods
895
896		/**
897		* {@inheritDoc}
898		*/
899		public int size() {
900	<	long n = counter.sum();
900	>	long n = sumCount();
901		return ((n < 0L) ? 0 :
902		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
903		(int)n);
904		}
905
906		/**
907	<	* Returns the number of mappings. This method should be used
2669	<	* instead of {@link #size} because a ConcurrentHashMapV8 may
2670	<	* contain more mappings than can be represented as an int. The
2671	<	* value returned is an estimate; the actual count may differ if
2672	<	* there are concurrent insertions or removals.
2673	<	*
2674	<	* @return the number of mappings
907	>	* {@inheritDoc}
908		*/
909	<	public long mappingCount() {
910	<	long n = counter.sum();
2678	<	return (n < 0L) ? 0L : n; // ignore transient negative values
909	>	public boolean isEmpty() {
910	>	return sumCount() <= 0L; // ignore transient negative values
911		}
912
913		/**
#	Line 2689 | Line 921 | public class ConcurrentHashMapV8<K, V>
921		*
922		* @throws NullPointerException if the specified key is null
923		*/
924	<	@SuppressWarnings("unchecked") public V get(Object key) {
925	<	if (key == null)
926	<	throw new NullPointerException();
927	<	return (V)internalGet(key);
928	<	}
929	<
930	<	/**
931	<	* Returns the value to which the specified key is mapped,
932	<	* or the given defaultValue if this map contains no mapping for the key.
933	<	*
934	<	* @param key the key
935	<	* @param defaultValue the value to return if this map contains
936	<	* no mapping for the given key
937	<	* @return the mapping for the key, if present; else the defaultValue
938	<	* @throws NullPointerException if the specified key is null
939	<	*/
940	<	@SuppressWarnings("unchecked") public V getValueOrDefault(Object key, V defaultValue) {
941	<	if (key == null)
2710	<	throw new NullPointerException();
2711	<	V v = (V) internalGet(key);
2712	<	return v == null ? defaultValue : v;
924	>	public V get(Object key) {
925	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
926	>	int h = spread(key.hashCode());
927	>	if ((tab = table) != null && (n = tab.length) > 0 &&
928	>	(e = tabAt(tab, (n - 1) & h)) != null) {
929	>	if ((eh = e.hash) == h) {
930	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
931	>	return e.val;
932	>	}
933	>	else if (eh < 0)
934	>	return (p = e.find(h, key)) != null ? p.val : null;
935	>	while ((e = e.next) != null) {
936	>	if (e.hash == h &&
937	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
938	>	return e.val;
939	>	}
940	>	}
941	>	return null;
942		}
943
944		/**
945		* Tests if the specified object is a key in this table.
946		*
947	<	* @param  key   possible key
947	>	* @param  key possible key
948		* @return {@code true} if and only if the specified object
949		*         is a key in this table, as determined by the
950		*         {@code equals} method; {@code false} otherwise
951		* @throws NullPointerException if the specified key is null
952		*/
953		public boolean containsKey(Object key) {
954	<	if (key == null)
2726	<	throw new NullPointerException();
2727	<	return internalGet(key) != null;
954	>	return get(key) != null;
955		}
956
957		/**
#	Line 2740 | Line 967 | public class ConcurrentHashMapV8<K, V>
967		public boolean containsValue(Object value) {
968		if (value == null)
969		throw new NullPointerException();
970	<	Object v;
971	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
972	<	while ((v = it.advance()) != null) {
973	<	if (v == value || value.equals(v))
974	<	return true;
970	>	Node<K,V>[] t;
971	>	if ((t = table) != null) {
972	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
973	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
974	>	V v;
975	>	if ((v = p.val) == value || (v != null && value.equals(v)))
976	>	return true;
977	>	}
978		}
979		return false;
980		}
981
982		/**
2753	–	* Legacy method testing if some key maps into the specified value
2754	–	* in this table.  This method is identical in functionality to
2755	–	* {@link #containsValue}, and exists solely to ensure
2756	–	* full compatibility with class {@link java.util.Hashtable},
2757	–	* which supported this method prior to introduction of the
2758	–	* Java Collections framework.
2759	–	*
2760	–	* @param  value a value to search for
2761	–	* @return {@code true} if and only if some key maps to the
2762	–	*         {@code value} argument in this table as
2763	–	*         determined by the {@code equals} method;
2764	–	*         {@code false} otherwise
2765	–	* @throws NullPointerException if the specified value is null
2766	–	*/
2767	–	public boolean contains(Object value) {
2768	–	return containsValue(value);
2769	–	}
2770	–
2771	–	/**
983		* Maps the specified key to the specified value in this table.
984		* Neither the key nor the value can be null.
985		*
#	Line 2781 | Line 992 | public class ConcurrentHashMapV8<K, V>
992		*         {@code null} if there was no mapping for {@code key}
993		* @throws NullPointerException if the specified key or value is null
994		*/
995	<	@SuppressWarnings("unchecked") public V put(K key, V value) {
996	<	if (key == null || value == null)
995	>	public V put(K key, V value) {
996	>	return putVal(key, value, false);
997	>	}
998	>
999	>	/** Implementation for put and putIfAbsent */
1000	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
1001	>	if (key == null || value == null) throw new NullPointerException();
1002	>	int hash = spread(key.hashCode());
1003	>	int binCount = 0;
1004	>	for (Node<K,V>[] tab = table;;) {
1005	>	Node<K,V> f; int n, i, fh;
1006	>	if (tab == null || (n = tab.length) == 0)
1007	>	tab = initTable();
1008	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
1009	>	if (casTabAt(tab, i, null,
1010	>	new Node<K,V>(hash, key, value, null)))
1011	>	break;                   // no lock when adding to empty bin
1012	>	}
1013	>	else if ((fh = f.hash) == MOVED)
1014	>	tab = helpTransfer(tab, f);
1015	>	else {
1016	>	V oldVal = null;
1017	>	synchronized (f) {
1018	>	if (tabAt(tab, i) == f) {
1019	>	if (fh >= 0) {
1020	>	binCount = 1;
1021	>	for (Node<K,V> e = f;; ++binCount) {
1022	>	K ek;
1023	>	if (e.hash == hash &&
1024	>	((ek = e.key) == key ||
1025	>	(ek != null && key.equals(ek)))) {
1026	>	oldVal = e.val;
1027	>	if (!onlyIfAbsent)
1028	>	e.val = value;
1029	>	break;
1030	>	}
1031	>	Node<K,V> pred = e;
1032	>	if ((e = e.next) == null) {
1033	>	pred.next = new Node<K,V>(hash, key,
1034	>	value, null);
1035	>	break;
1036	>	}
1037	>	}
1038	>	}
1039	>	else if (f instanceof TreeBin) {
1040	>	Node<K,V> p;
1041	>	binCount = 2;
1042	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1043	>	value)) != null) {
1044	>	oldVal = p.val;
1045	>	if (!onlyIfAbsent)
1046	>	p.val = value;
1047	>	}
1048	>	}
1049	>	}
1050	>	}
1051	>	if (binCount != 0) {
1052	>	if (binCount >= TREEIFY_THRESHOLD)
1053	>	treeifyBin(tab, i);
1054	>	if (oldVal != null)
1055	>	return oldVal;
1056	>	break;
1057	>	}
1058	>	}
1059	>	}
1060	>	addCount(1L, binCount);
1061	>	return null;
1062	>	}
1063	>
1064	>	/**
1065	>	* Copies all of the mappings from the specified map to this one.
1066	>	* These mappings replace any mappings that this map had for any of the
1067	>	* keys currently in the specified map.
1068	>	*
1069	>	* @param m mappings to be stored in this map
1070	>	*/
1071	>	public void putAll(Map<? extends K, ? extends V> m) {
1072	>	tryPresize(m.size());
1073	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1074	>	putVal(e.getKey(), e.getValue(), false);
1075	>	}
1076	>
1077	>	/**
1078	>	* Removes the key (and its corresponding value) from this map.
1079	>	* This method does nothing if the key is not in the map.
1080	>	*
1081	>	* @param  key the key that needs to be removed
1082	>	* @return the previous value associated with {@code key}, or
1083	>	*         {@code null} if there was no mapping for {@code key}
1084	>	* @throws NullPointerException if the specified key is null
1085	>	*/
1086	>	public V remove(Object key) {
1087	>	return replaceNode(key, null, null);
1088	>	}
1089	>
1090	>	/**
1091	>	* Implementation for the four public remove/replace methods:
1092	>	* Replaces node value with v, conditional upon match of cv if
1093	>	* non-null.  If resulting value is null, delete.
1094	>	*/
1095	>	final V replaceNode(Object key, V value, Object cv) {
1096	>	int hash = spread(key.hashCode());
1097	>	for (Node<K,V>[] tab = table;;) {
1098	>	Node<K,V> f; int n, i, fh;
1099	>	if (tab == null || (n = tab.length) == 0 ||
1100	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1101	>	break;
1102	>	else if ((fh = f.hash) == MOVED)
1103	>	tab = helpTransfer(tab, f);
1104	>	else {
1105	>	V oldVal = null;
1106	>	boolean validated = false;
1107	>	synchronized (f) {
1108	>	if (tabAt(tab, i) == f) {
1109	>	if (fh >= 0) {
1110	>	validated = true;
1111	>	for (Node<K,V> e = f, pred = null;;) {
1112	>	K ek;
1113	>	if (e.hash == hash &&
1114	>	((ek = e.key) == key ||
1115	>	(ek != null && key.equals(ek)))) {
1116	>	V ev = e.val;
1117	>	if (cv == null || cv == ev ||
1118	>	(ev != null && cv.equals(ev))) {
1119	>	oldVal = ev;
1120	>	if (value != null)
1121	>	e.val = value;
1122	>	else if (pred != null)
1123	>	pred.next = e.next;
1124	>	else
1125	>	setTabAt(tab, i, e.next);
1126	>	}
1127	>	break;
1128	>	}
1129	>	pred = e;
1130	>	if ((e = e.next) == null)
1131	>	break;
1132	>	}
1133	>	}
1134	>	else if (f instanceof TreeBin) {
1135	>	validated = true;
1136	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1137	>	TreeNode<K,V> r, p;
1138	>	if ((r = t.root) != null &&
1139	>	(p = r.findTreeNode(hash, key, null)) != null) {
1140	>	V pv = p.val;
1141	>	if (cv == null || cv == pv ||
1142	>	(pv != null && cv.equals(pv))) {
1143	>	oldVal = pv;
1144	>	if (value != null)
1145	>	p.val = value;
1146	>	else if (t.removeTreeNode(p))
1147	>	setTabAt(tab, i, untreeify(t.first));
1148	>	}
1149	>	}
1150	>	}
1151	>	}
1152	>	}
1153	>	if (validated) {
1154	>	if (oldVal != null) {
1155	>	if (value == null)
1156	>	addCount(-1L, -1);
1157	>	return oldVal;
1158	>	}
1159	>	break;
1160	>	}
1161	>	}
1162	>	}
1163	>	return null;
1164	>	}
1165	>
1166	>	/**
1167	>	* Removes all of the mappings from this map.
1168	>	*/
1169	>	public void clear() {
1170	>	long delta = 0L; // negative number of deletions
1171	>	int i = 0;
1172	>	Node<K,V>[] tab = table;
1173	>	while (tab != null && i < tab.length) {
1174	>	int fh;
1175	>	Node<K,V> f = tabAt(tab, i);
1176	>	if (f == null)
1177	>	++i;
1178	>	else if ((fh = f.hash) == MOVED) {
1179	>	tab = helpTransfer(tab, f);
1180	>	i = 0; // restart
1181	>	}
1182	>	else {
1183	>	synchronized (f) {
1184	>	if (tabAt(tab, i) == f) {
1185	>	Node<K,V> p = (fh >= 0 ? f :
1186	>	(f instanceof TreeBin) ?
1187	>	((TreeBin<K,V>)f).first : null);
1188	>	while (p != null) {
1189	>	--delta;
1190	>	p = p.next;
1191	>	}
1192	>	setTabAt(tab, i++, null);
1193	>	}
1194	>	}
1195	>	}
1196	>	}
1197	>	if (delta != 0L)
1198	>	addCount(delta, -1);
1199	>	}
1200	>
1201	>	/**
1202	>	* Returns a {@link Set} view of the keys contained in this map.
1203	>	* The set is backed by the map, so changes to the map are
1204	>	* reflected in the set, and vice-versa. The set supports element
1205	>	* removal, which removes the corresponding mapping from this map,
1206	>	* via the {@code Iterator.remove}, {@code Set.remove},
1207	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1208	>	* operations.  It does not support the {@code add} or
1209	>	* {@code addAll} operations.
1210	>	*
1211	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1212	>	* that will never throw {@link ConcurrentModificationException},
1213	>	* and guarantees to traverse elements as they existed upon
1214	>	* construction of the iterator, and may (but is not guaranteed to)
1215	>	* reflect any modifications subsequent to construction.
1216	>	*
1217	>	* @return the set view
1218	>	*/
1219	>	public KeySetView<K,V> keySet() {
1220	>	KeySetView<K,V> ks;
1221	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1222	>	}
1223	>
1224	>	/**
1225	>	* Returns a {@link Collection} view of the values contained in this map.
1226	>	* The collection is backed by the map, so changes to the map are
1227	>	* reflected in the collection, and vice-versa.  The collection
1228	>	* supports element removal, which removes the corresponding
1229	>	* mapping from this map, via the {@code Iterator.remove},
1230	>	* {@code Collection.remove}, {@code removeAll},
1231	>	* {@code retainAll}, and {@code clear} operations.  It does not
1232	>	* support the {@code add} or {@code addAll} operations.
1233	>	*
1234	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1235	>	* that will never throw {@link ConcurrentModificationException},
1236	>	* and guarantees to traverse elements as they existed upon
1237	>	* construction of the iterator, and may (but is not guaranteed to)
1238	>	* reflect any modifications subsequent to construction.
1239	>	*
1240	>	* @return the collection view
1241	>	*/
1242	>	public Collection<V> values() {
1243	>	ValuesView<K,V> vs;
1244	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1245	>	}
1246	>
1247	>	/**
1248	>	* Returns a {@link Set} view of the mappings contained in this map.
1249	>	* The set is backed by the map, so changes to the map are
1250	>	* reflected in the set, and vice-versa.  The set supports element
1251	>	* removal, which removes the corresponding mapping from the map,
1252	>	* via the {@code Iterator.remove}, {@code Set.remove},
1253	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1254	>	* operations.
1255	>	*
1256	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1257	>	* that will never throw {@link ConcurrentModificationException},
1258	>	* and guarantees to traverse elements as they existed upon
1259	>	* construction of the iterator, and may (but is not guaranteed to)
1260	>	* reflect any modifications subsequent to construction.
1261	>	*
1262	>	* @return the set view
1263	>	*/
1264	>	public Set<Map.Entry<K,V>> entrySet() {
1265	>	EntrySetView<K,V> es;
1266	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1267	>	}
1268	>
1269	>	/**
1270	>	* Returns the hash code value for this {@link Map}, i.e.,
1271	>	* the sum of, for each key-value pair in the map,
1272	>	* {@code key.hashCode() ^ value.hashCode()}.
1273	>	*
1274	>	* @return the hash code value for this map
1275	>	*/
1276	>	public int hashCode() {
1277	>	int h = 0;
1278	>	Node<K,V>[] t;
1279	>	if ((t = table) != null) {
1280	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1281	>	for (Node<K,V> p; (p = it.advance()) != null; )
1282	>	h += p.key.hashCode() ^ p.val.hashCode();
1283	>	}
1284	>	return h;
1285	>	}
1286	>
1287	>	/**
1288	>	* Returns a string representation of this map.  The string
1289	>	* representation consists of a list of key-value mappings (in no
1290	>	* particular order) enclosed in braces ("{@code {}}").  Adjacent
1291	>	* mappings are separated by the characters {@code ", "} (comma
1292	>	* and space).  Each key-value mapping is rendered as the key
1293	>	* followed by an equals sign ("{@code =}") followed by the
1294	>	* associated value.
1295	>	*
1296	>	* @return a string representation of this map
1297	>	*/
1298	>	public String toString() {
1299	>	Node<K,V>[] t;
1300	>	int f = (t = table) == null ? 0 : t.length;
1301	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1302	>	StringBuilder sb = new StringBuilder();
1303	>	sb.append('{');
1304	>	Node<K,V> p;
1305	>	if ((p = it.advance()) != null) {
1306	>	for (;;) {
1307	>	K k = p.key;
1308	>	V v = p.val;
1309	>	sb.append(k == this ? "(this Map)" : k);
1310	>	sb.append('=');
1311	>	sb.append(v == this ? "(this Map)" : v);
1312	>	if ((p = it.advance()) == null)
1313	>	break;
1314	>	sb.append(',').append(' ');
1315	>	}
1316	>	}
1317	>	return sb.append('}').toString();
1318	>	}
1319	>
1320	>	/**
1321	>	* Compares the specified object with this map for equality.
1322	>	* Returns {@code true} if the given object is a map with the same
1323	>	* mappings as this map.  This operation may return misleading
1324	>	* results if either map is concurrently modified during execution
1325	>	* of this method.
1326	>	*
1327	>	* @param o object to be compared for equality with this map
1328	>	* @return {@code true} if the specified object is equal to this map
1329	>	*/
1330	>	public boolean equals(Object o) {
1331	>	if (o != this) {
1332	>	if (!(o instanceof Map))
1333	>	return false;
1334	>	Map<?,?> m = (Map<?,?>) o;
1335	>	Node<K,V>[] t;
1336	>	int f = (t = table) == null ? 0 : t.length;
1337	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1338	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1339	>	V val = p.val;
1340	>	Object v = m.get(p.key);
1341	>	if (v == null || (v != val && !v.equals(val)))
1342	>	return false;
1343	>	}
1344	>	for (Map.Entry<?,?> e : m.entrySet()) {
1345	>	Object mk, mv, v;
1346	>	if ((mk = e.getKey()) == null ||
1347	>	(mv = e.getValue()) == null ||
1348	>	(v = get(mk)) == null ||
1349	>	(mv != v && !mv.equals(v)))
1350	>	return false;
1351	>	}
1352	>	}
1353	>	return true;
1354	>	}
1355	>
1356	>	/**
1357	>	* Stripped-down version of helper class used in previous version,
1358	>	* declared for the sake of serialization compatibility
1359	>	*/
1360	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1361	>	private static final long serialVersionUID = 2249069246763182397L;
1362	>	final float loadFactor;
1363	>	Segment(float lf) { this.loadFactor = lf; }
1364	>	}
1365	>
1366	>	/**
1367	>	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
1368	>	* stream (i.e., serializes it).
1369	>	* @param s the stream
1370	>	* @throws java.io.IOException if an I/O error occurs
1371	>	* @serialData
1372	>	* the key (Object) and value (Object)
1373	>	* for each key-value mapping, followed by a null pair.
1374	>	* The key-value mappings are emitted in no particular order.
1375	>	*/
1376	>	private void writeObject(java.io.ObjectOutputStream s)
1377	>	throws java.io.IOException {
1378	>	// For serialization compatibility
1379	>	// Emulate segment calculation from previous version of this class
1380	>	int sshift = 0;
1381	>	int ssize = 1;
1382	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1383	>	++sshift;
1384	>	ssize <<= 1;
1385	>	}
1386	>	int segmentShift = 32 - sshift;
1387	>	int segmentMask = ssize - 1;
1388	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1389	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1390	>	for (int i = 0; i < segments.length; ++i)
1391	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1392	>	s.putFields().put("segments", segments);
1393	>	s.putFields().put("segmentShift", segmentShift);
1394	>	s.putFields().put("segmentMask", segmentMask);
1395	>	s.writeFields();
1396	>
1397	>	Node<K,V>[] t;
1398	>	if ((t = table) != null) {
1399	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1400	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1401	>	s.writeObject(p.key);
1402	>	s.writeObject(p.val);
1403	>	}
1404	>	}
1405	>	s.writeObject(null);
1406	>	s.writeObject(null);
1407	>	segments = null; // throw away
1408	>	}
1409	>
1410	>	/**
1411	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1412	>	* @param s the stream
1413	>	* @throws ClassNotFoundException if the class of a serialized object
1414	>	*         could not be found
1415	>	* @throws java.io.IOException if an I/O error occurs
1416	>	*/
1417	>	private void readObject(java.io.ObjectInputStream s)
1418	>	throws java.io.IOException, ClassNotFoundException {
1419	>	/*
1420	>	* To improve performance in typical cases, we create nodes
1421	>	* while reading, then place in table once size is known.
1422	>	* However, we must also validate uniqueness and deal with
1423	>	* overpopulated bins while doing so, which requires
1424	>	* specialized versions of putVal mechanics.
1425	>	*/
1426	>	sizeCtl = -1; // force exclusion for table construction
1427	>	s.defaultReadObject();
1428	>	long size = 0L;
1429	>	Node<K,V> p = null;
1430	>	for (;;) {
1431	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1432	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1433	>	if (k != null && v != null) {
1434	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1435	>	++size;
1436	>	}
1437	>	else
1438	>	break;
1439	>	}
1440	>	if (size == 0L)
1441	>	sizeCtl = 0;
1442	>	else {
1443	>	int n;
1444	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1445	>	n = MAXIMUM_CAPACITY;
1446	>	else {
1447	>	int sz = (int)size;
1448	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1449	>	}
1450	>	@SuppressWarnings("unchecked")
1451	>	Node<K,V>[] tab = (Node<K,V>[])new Node<?,?>[n];
1452	>	int mask = n - 1;
1453	>	long added = 0L;
1454	>	while (p != null) {
1455	>	boolean insertAtFront;
1456	>	Node<K,V> next = p.next, first;
1457	>	int h = p.hash, j = h & mask;
1458	>	if ((first = tabAt(tab, j)) == null)
1459	>	insertAtFront = true;
1460	>	else {
1461	>	K k = p.key;
1462	>	if (first.hash < 0) {
1463	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1464	>	if (t.putTreeVal(h, k, p.val) == null)
1465	>	++added;
1466	>	insertAtFront = false;
1467	>	}
1468	>	else {
1469	>	int binCount = 0;
1470	>	insertAtFront = true;
1471	>	Node<K,V> q; K qk;
1472	>	for (q = first; q != null; q = q.next) {
1473	>	if (q.hash == h &&
1474	>	((qk = q.key) == k ||
1475	>	(qk != null && k.equals(qk)))) {
1476	>	insertAtFront = false;
1477	>	break;
1478	>	}
1479	>	++binCount;
1480	>	}
1481	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1482	>	insertAtFront = false;
1483	>	++added;
1484	>	p.next = first;
1485	>	TreeNode<K,V> hd = null, tl = null;
1486	>	for (q = p; q != null; q = q.next) {
1487	>	TreeNode<K,V> t = new TreeNode<K,V>
1488	>	(q.hash, q.key, q.val, null, null);
1489	>	if ((t.prev = tl) == null)
1490	>	hd = t;
1491	>	else
1492	>	tl.next = t;
1493	>	tl = t;
1494	>	}
1495	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1496	>	}
1497	>	}
1498	>	}
1499	>	if (insertAtFront) {
1500	>	++added;
1501	>	p.next = first;
1502	>	setTabAt(tab, j, p);
1503	>	}
1504	>	p = next;
1505	>	}
1506	>	table = tab;
1507	>	sizeCtl = n - (n >>> 2);
1508	>	baseCount = added;
1509	>	}
1510	>	}
1511	>
1512	>	// ConcurrentMap methods
1513	>
1514	>	/**
1515	>	* {@inheritDoc}
1516	>	*
1517	>	* @return the previous value associated with the specified key,
1518	>	*         or {@code null} if there was no mapping for the key
1519	>	* @throws NullPointerException if the specified key or value is null
1520	>	*/
1521	>	public V putIfAbsent(K key, V value) {
1522	>	return putVal(key, value, true);
1523	>	}
1524	>
1525	>	/**
1526	>	* {@inheritDoc}
1527	>	*
1528	>	* @throws NullPointerException if the specified key is null
1529	>	*/
1530	>	public boolean remove(Object key, Object value) {
1531	>	if (key == null)
1532		throw new NullPointerException();
1533	<	return (V)internalPut(key, value);
1533	>	return value != null && replaceNode(key, null, value) != null;
1534	>	}
1535	>
1536	>	/**
1537	>	* {@inheritDoc}
1538	>	*
1539	>	* @throws NullPointerException if any of the arguments are null
1540	>	*/
1541	>	public boolean replace(K key, V oldValue, V newValue) {
1542	>	if (key == null || oldValue == null || newValue == null)
1543	>	throw new NullPointerException();
1544	>	return replaceNode(key, newValue, oldValue) != null;
1545		}
1546
1547		/**
#	Line 2794 | Line 1551 | public class ConcurrentHashMapV8<K, V>
1551		*         or {@code null} if there was no mapping for the key
1552		* @throws NullPointerException if the specified key or value is null
1553		*/
1554	<	@SuppressWarnings("unchecked") public V putIfAbsent(K key, V value) {
1554	>	public V replace(K key, V value) {
1555		if (key == null || value == null)
1556		throw new NullPointerException();
1557	<	return (V)internalPutIfAbsent(key, value);
1557	>	return replaceNode(key, value, null);
1558		}
1559
1560	+	// Overrides of JDK8+ Map extension method defaults
1561	+
1562		/**
1563	<	* Copies all of the mappings from the specified map to this one.
1564	<	* These mappings replace any mappings that this map had for any of the
1565	<	* keys currently in the specified map.
1563	>	* Returns the value to which the specified key is mapped, or the
1564	>	* given default value if this map contains no mapping for the
1565	>	* key.
1566		*
1567	<	* @param m mappings to be stored in this map
1567	>	* @param key the key whose associated value is to be returned
1568	>	* @param defaultValue the value to return if this map contains
1569	>	* no mapping for the given key
1570	>	* @return the mapping for the key, if present; else the default value
1571	>	* @throws NullPointerException if the specified key is null
1572		*/
1573	<	public void putAll(Map<? extends K, ? extends V> m) {
1574	<	internalPutAll(m);
1573	>	public V getOrDefault(Object key, V defaultValue) {
1574	>	V v;
1575	>	return (v = get(key)) == null ? defaultValue : v;
1576	>	}
1577	>
1578	>	public void forEach(BiAction<? super K, ? super V> action) {
1579	>	if (action == null) throw new NullPointerException();
1580	>	Node<K,V>[] t;
1581	>	if ((t = table) != null) {
1582	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1583	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1584	>	action.apply(p.key, p.val);
1585	>	}
1586	>	}
1587	>	}
1588	>
1589	>	public void replaceAll(BiFun<? super K, ? super V, ? extends V> function) {
1590	>	if (function == null) throw new NullPointerException();
1591	>	Node<K,V>[] t;
1592	>	if ((t = table) != null) {
1593	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1594	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1595	>	V oldValue = p.val;
1596	>	for (K key = p.key;;) {
1597	>	V newValue = function.apply(key, oldValue);
1598	>	if (newValue == null)
1599	>	throw new NullPointerException();
1600	>	if (replaceNode(key, newValue, oldValue) != null ||
1601	>	(oldValue = get(key)) == null)
1602	>	break;
1603	>	}
1604	>	}
1605	>	}
1606		}
1607
1608		/**
1609		* If the specified key is not already associated with a value,
1610	<	* computes its value using the given mappingFunction and enters
1611	<	* it into the map unless null.  This is equivalent to
1612	<	* <pre> {@code
1613	<	* if (map.containsKey(key))
1614	<	*   return map.get(key);
1615	<	* value = mappingFunction.apply(key);
1616	<	* if (value != null)
2823	<	*   map.put(key, value);
2824	<	* return value;}</pre>
2825	<	*
2826	<	* except that the action is performed atomically.  If the
2827	<	* function returns {@code null} no mapping is recorded. If the
2828	<	* function itself throws an (unchecked) exception, the exception
2829	<	* is rethrown to its caller, and no mapping is recorded.  Some
2830	<	* attempted update operations on this map by other threads may be
2831	<	* blocked while computation is in progress, so the computation
2832	<	* should be short and simple, and must not attempt to update any
2833	<	* other mappings of this Map. The most appropriate usage is to
2834	<	* construct a new object serving as an initial mapped value, or
2835	<	* memoized result, as in:
2836	<	*
2837	<	*  <pre> {@code
2838	<	* map.computeIfAbsent(key, new Fun<K, V>() {
2839	<	*   public V map(K k) { return new Value(f(k)); }});}</pre>
1610	>	* attempts to compute its value using the given mapping function
1611	>	* and enters it into this map unless {@code null}.  The entire
1612	>	* method invocation is performed atomically, so the function is
1613	>	* applied at most once per key.  Some attempted update operations
1614	>	* on this map by other threads may be blocked while computation
1615	>	* is in progress, so the computation should be short and simple,
1616	>	* and must not attempt to update any other mappings of this map.
1617		*
1618		* @param key key with which the specified value is to be associated
1619		* @param mappingFunction the function to compute a value
#	Line 2850 | Line 1627 | public class ConcurrentHashMapV8<K, V>
1627		* @throws RuntimeException or Error if the mappingFunction does so,
1628		*         in which case the mapping is left unestablished
1629		*/
1630	<	@SuppressWarnings("unchecked") public V computeIfAbsent
2854	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
1630	>	public V computeIfAbsent(K key, Fun<? super K, ? extends V> mappingFunction) {
1631		if (key == null || mappingFunction == null)
1632		throw new NullPointerException();
1633	<	return (V)internalComputeIfAbsent(key, mappingFunction);
1633	>	int h = spread(key.hashCode());
1634	>	V val = null;
1635	>	int binCount = 0;
1636	>	for (Node<K,V>[] tab = table;;) {
1637	>	Node<K,V> f; int n, i, fh;
1638	>	if (tab == null || (n = tab.length) == 0)
1639	>	tab = initTable();
1640	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1641	>	Node<K,V> r = new ReservationNode<K,V>();
1642	>	synchronized (r) {
1643	>	if (casTabAt(tab, i, null, r)) {
1644	>	binCount = 1;
1645	>	Node<K,V> node = null;
1646	>	try {
1647	>	if ((val = mappingFunction.apply(key)) != null)
1648	>	node = new Node<K,V>(h, key, val, null);
1649	>	} finally {
1650	>	setTabAt(tab, i, node);
1651	>	}
1652	>	}
1653	>	}
1654	>	if (binCount != 0)
1655	>	break;
1656	>	}
1657	>	else if ((fh = f.hash) == MOVED)
1658	>	tab = helpTransfer(tab, f);
1659	>	else {
1660	>	boolean added = false;
1661	>	synchronized (f) {
1662	>	if (tabAt(tab, i) == f) {
1663	>	if (fh >= 0) {
1664	>	binCount = 1;
1665	>	for (Node<K,V> e = f;; ++binCount) {
1666	>	K ek; V ev;
1667	>	if (e.hash == h &&
1668	>	((ek = e.key) == key ||
1669	>	(ek != null && key.equals(ek)))) {
1670	>	val = e.val;
1671	>	break;
1672	>	}
1673	>	Node<K,V> pred = e;
1674	>	if ((e = e.next) == null) {
1675	>	if ((val = mappingFunction.apply(key)) != null) {
1676	>	added = true;
1677	>	pred.next = new Node<K,V>(h, key, val, null);
1678	>	}
1679	>	break;
1680	>	}
1681	>	}
1682	>	}
1683	>	else if (f instanceof TreeBin) {
1684	>	binCount = 2;
1685	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1686	>	TreeNode<K,V> r, p;
1687	>	if ((r = t.root) != null &&
1688	>	(p = r.findTreeNode(h, key, null)) != null)
1689	>	val = p.val;
1690	>	else if ((val = mappingFunction.apply(key)) != null) {
1691	>	added = true;
1692	>	t.putTreeVal(h, key, val);
1693	>	}
1694	>	}
1695	>	}
1696	>	}
1697	>	if (binCount != 0) {
1698	>	if (binCount >= TREEIFY_THRESHOLD)
1699	>	treeifyBin(tab, i);
1700	>	if (!added)
1701	>	return val;
1702	>	break;
1703	>	}
1704	>	}
1705	>	}
1706	>	if (val != null)
1707	>	addCount(1L, binCount);
1708	>	return val;
1709		}
1710
1711		/**
1712	<	* If the given key is present, computes a new mapping value given a key and
1713	<	* its current mapped value. This is equivalent to
1714	<	*  <pre> {@code
1715	<	*   if (map.containsKey(key)) {
1716	<	*     value = remappingFunction.apply(key, map.get(key));
1717	<	*     if (value != null)
1718	<	*       map.put(key, value);
2868	<	*     else
2869	<	*       map.remove(key);
2870	<	*   }
2871	<	* }</pre>
2872	<	*
2873	<	* except that the action is performed atomically.  If the
2874	<	* function returns {@code null}, the mapping is removed.  If the
2875	<	* function itself throws an (unchecked) exception, the exception
2876	<	* is rethrown to its caller, and the current mapping is left
2877	<	* unchanged.  Some attempted update operations on this map by
2878	<	* other threads may be blocked while computation is in progress,
2879	<	* so the computation should be short and simple, and must not
2880	<	* attempt to update any other mappings of this Map. For example,
2881	<	* to either create or append new messages to a value mapping:
1712	>	* If the value for the specified key is present, attempts to
1713	>	* compute a new mapping given the key and its current mapped
1714	>	* value.  The entire method invocation is performed atomically.
1715	>	* Some attempted update operations on this map by other threads
1716	>	* may be blocked while computation is in progress, so the
1717	>	* computation should be short and simple, and must not attempt to
1718	>	* update any other mappings of this map.
1719		*
1720	<	* @param key key with which the specified value is to be associated
1720	>	* @param key key with which a value may be associated
1721		* @param remappingFunction the function to compute a value
1722		* @return the new value associated with the specified key, or null if none
1723		* @throws NullPointerException if the specified key or remappingFunction
#	Line 2891 | Line 1728 | public class ConcurrentHashMapV8<K, V>
1728		* @throws RuntimeException or Error if the remappingFunction does so,
1729		*         in which case the mapping is unchanged
1730		*/
1731	<	@SuppressWarnings("unchecked") public V computeIfPresent
2895	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1731	>	public V computeIfPresent(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1732		if (key == null || remappingFunction == null)
1733		throw new NullPointerException();
1734	<	return (V)internalCompute(key, true, remappingFunction);
1734	>	int h = spread(key.hashCode());
1735	>	V val = null;
1736	>	int delta = 0;
1737	>	int binCount = 0;
1738	>	for (Node<K,V>[] tab = table;;) {
1739	>	Node<K,V> f; int n, i, fh;
1740	>	if (tab == null || (n = tab.length) == 0)
1741	>	tab = initTable();
1742	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1743	>	break;
1744	>	else if ((fh = f.hash) == MOVED)
1745	>	tab = helpTransfer(tab, f);
1746	>	else {
1747	>	synchronized (f) {
1748	>	if (tabAt(tab, i) == f) {
1749	>	if (fh >= 0) {
1750	>	binCount = 1;
1751	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1752	>	K ek;
1753	>	if (e.hash == h &&
1754	>	((ek = e.key) == key ||
1755	>	(ek != null && key.equals(ek)))) {
1756	>	val = remappingFunction.apply(key, e.val);
1757	>	if (val != null)
1758	>	e.val = val;
1759	>	else {
1760	>	delta = -1;
1761	>	Node<K,V> en = e.next;
1762	>	if (pred != null)
1763	>	pred.next = en;
1764	>	else
1765	>	setTabAt(tab, i, en);
1766	>	}
1767	>	break;
1768	>	}
1769	>	pred = e;
1770	>	if ((e = e.next) == null)
1771	>	break;
1772	>	}
1773	>	}
1774	>	else if (f instanceof TreeBin) {
1775	>	binCount = 2;
1776	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1777	>	TreeNode<K,V> r, p;
1778	>	if ((r = t.root) != null &&
1779	>	(p = r.findTreeNode(h, key, null)) != null) {
1780	>	val = remappingFunction.apply(key, p.val);
1781	>	if (val != null)
1782	>	p.val = val;
1783	>	else {
1784	>	delta = -1;
1785	>	if (t.removeTreeNode(p))
1786	>	setTabAt(tab, i, untreeify(t.first));
1787	>	}
1788	>	}
1789	>	}
1790	>	}
1791	>	}
1792	>	if (binCount != 0)
1793	>	break;
1794	>	}
1795	>	}
1796	>	if (delta != 0)
1797	>	addCount((long)delta, binCount);
1798	>	return val;
1799		}
1800
1801		/**
1802	<	* Computes a new mapping value given a key and
1803	<	* its current mapped value (or {@code null} if there is no current
1804	<	* mapping). This is equivalent to
1805	<	*  <pre> {@code
1806	<	*   value = remappingFunction.apply(key, map.get(key));
1807	<	*   if (value != null)
1808	<	*     map.put(key, value);
2909	<	*   else
2910	<	*     map.remove(key);
2911	<	* }</pre>
2912	<	*
2913	<	* except that the action is performed atomically.  If the
2914	<	* function returns {@code null}, the mapping is removed.  If the
2915	<	* function itself throws an (unchecked) exception, the exception
2916	<	* is rethrown to its caller, and the current mapping is left
2917	<	* unchanged.  Some attempted update operations on this map by
2918	<	* other threads may be blocked while computation is in progress,
2919	<	* so the computation should be short and simple, and must not
2920	<	* attempt to update any other mappings of this Map. For example,
2921	<	* to either create or append new messages to a value mapping:
2922	<	*
2923	<	* <pre> {@code
2924	<	* Map<Key, String> map = ...;
2925	<	* final String msg = ...;
2926	<	* map.compute(key, new BiFun<Key, String, String>() {
2927	<	*   public String apply(Key k, String v) {
2928	<	*    return (v == null) ? msg : v + msg;});}}</pre>
1802	>	* Attempts to compute a mapping for the specified key and its
1803	>	* current mapped value (or {@code null} if there is no current
1804	>	* mapping). The entire method invocation is performed atomically.
1805	>	* Some attempted update operations on this map by other threads
1806	>	* may be blocked while computation is in progress, so the
1807	>	* computation should be short and simple, and must not attempt to
1808	>	* update any other mappings of this Map.
1809		*
1810		* @param key key with which the specified value is to be associated
1811		* @param remappingFunction the function to compute a value
#	Line 2938 | Line 1818 | public class ConcurrentHashMapV8<K, V>
1818		* @throws RuntimeException or Error if the remappingFunction does so,
1819		*         in which case the mapping is unchanged
1820		*/
1821	<	@SuppressWarnings("unchecked") public V compute
1822	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1821	>	public V compute(K key,
1822	>	BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1823		if (key == null || remappingFunction == null)
1824		throw new NullPointerException();
1825	<	return (V)internalCompute(key, false, remappingFunction);
1825	>	int h = spread(key.hashCode());
1826	>	V val = null;
1827	>	int delta = 0;
1828	>	int binCount = 0;
1829	>	for (Node<K,V>[] tab = table;;) {
1830	>	Node<K,V> f; int n, i, fh;
1831	>	if (tab == null || (n = tab.length) == 0)
1832	>	tab = initTable();
1833	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1834	>	Node<K,V> r = new ReservationNode<K,V>();
1835	>	synchronized (r) {
1836	>	if (casTabAt(tab, i, null, r)) {
1837	>	binCount = 1;
1838	>	Node<K,V> node = null;
1839	>	try {
1840	>	if ((val = remappingFunction.apply(key, null)) != null) {
1841	>	delta = 1;
1842	>	node = new Node<K,V>(h, key, val, null);
1843	>	}
1844	>	} finally {
1845	>	setTabAt(tab, i, node);
1846	>	}
1847	>	}
1848	>	}
1849	>	if (binCount != 0)
1850	>	break;
1851	>	}
1852	>	else if ((fh = f.hash) == MOVED)
1853	>	tab = helpTransfer(tab, f);
1854	>	else {
1855	>	synchronized (f) {
1856	>	if (tabAt(tab, i) == f) {
1857	>	if (fh >= 0) {
1858	>	binCount = 1;
1859	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1860	>	K ek;
1861	>	if (e.hash == h &&
1862	>	((ek = e.key) == key ||
1863	>	(ek != null && key.equals(ek)))) {
1864	>	val = remappingFunction.apply(key, e.val);
1865	>	if (val != null)
1866	>	e.val = val;
1867	>	else {
1868	>	delta = -1;
1869	>	Node<K,V> en = e.next;
1870	>	if (pred != null)
1871	>	pred.next = en;
1872	>	else
1873	>	setTabAt(tab, i, en);
1874	>	}
1875	>	break;
1876	>	}
1877	>	pred = e;
1878	>	if ((e = e.next) == null) {
1879	>	val = remappingFunction.apply(key, null);
1880	>	if (val != null) {
1881	>	delta = 1;
1882	>	pred.next =
1883	>	new Node<K,V>(h, key, val, null);
1884	>	}
1885	>	break;
1886	>	}
1887	>	}
1888	>	}
1889	>	else if (f instanceof TreeBin) {
1890	>	binCount = 1;
1891	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1892	>	TreeNode<K,V> r, p;
1893	>	if ((r = t.root) != null)
1894	>	p = r.findTreeNode(h, key, null);
1895	>	else
1896	>	p = null;
1897	>	V pv = (p == null) ? null : p.val;
1898	>	val = remappingFunction.apply(key, pv);
1899	>	if (val != null) {
1900	>	if (p != null)
1901	>	p.val = val;
1902	>	else {
1903	>	delta = 1;
1904	>	t.putTreeVal(h, key, val);
1905	>	}
1906	>	}
1907	>	else if (p != null) {
1908	>	delta = -1;
1909	>	if (t.removeTreeNode(p))
1910	>	setTabAt(tab, i, untreeify(t.first));
1911	>	}
1912	>	}
1913	>	}
1914	>	}
1915	>	if (binCount != 0) {
1916	>	if (binCount >= TREEIFY_THRESHOLD)
1917	>	treeifyBin(tab, i);
1918	>	break;
1919	>	}
1920	>	}
1921	>	}
1922	>	if (delta != 0)
1923	>	addCount((long)delta, binCount);
1924	>	return val;
1925		}
1926
1927		/**
1928	<	* If the specified key is not already associated
1929	<	* with a value, associate it with the given value.
1930	<	* Otherwise, replace the value with the results of
1931	<	* the given remapping function. This is equivalent to:
1932	<	*  <pre> {@code
1933	<	*   if (!map.containsKey(key))
1934	<	*     map.put(value);
1935	<	*   else {
1936	<	*     newValue = remappingFunction.apply(map.get(key), value);
1937	<	*     if (value != null)
1938	<	*       map.put(key, value);
1939	<	*     else
1940	<	*       map.remove(key);
1941	<	*   }
1942	<	* }</pre>
1943	<	* except that the action is performed atomically.  If the
1944	<	* function returns {@code null}, the mapping is removed.  If the
1945	<	* function itself throws an (unchecked) exception, the exception
2967	<	* is rethrown to its caller, and the current mapping is left
2968	<	* unchanged.  Some attempted update operations on this map by
2969	<	* other threads may be blocked while computation is in progress,
2970	<	* so the computation should be short and simple, and must not
2971	<	* attempt to update any other mappings of this Map.
1928	>	* If the specified key is not already associated with a
1929	>	* (non-null) value, associates it with the given value.
1930	>	* Otherwise, replaces the value with the results of the given
1931	>	* remapping function, or removes if {@code null}. The entire
1932	>	* method invocation is performed atomically.  Some attempted
1933	>	* update operations on this map by other threads may be blocked
1934	>	* while computation is in progress, so the computation should be
1935	>	* short and simple, and must not attempt to update any other
1936	>	* mappings of this Map.
1937	>	*
1938	>	* @param key key with which the specified value is to be associated
1939	>	* @param value the value to use if absent
1940	>	* @param remappingFunction the function to recompute a value if present
1941	>	* @return the new value associated with the specified key, or null if none
1942	>	* @throws NullPointerException if the specified key or the
1943	>	*         remappingFunction is null
1944	>	* @throws RuntimeException or Error if the remappingFunction does so,
1945	>	*         in which case the mapping is unchanged
1946		*/
1947	<	@SuppressWarnings("unchecked") public V merge
2974	<	(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1947	>	public V merge(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1948		if (key == null || value == null || remappingFunction == null)
1949		throw new NullPointerException();
1950	<	return (V)internalMerge(key, value, remappingFunction);
1950	>	int h = spread(key.hashCode());
1951	>	V val = null;
1952	>	int delta = 0;
1953	>	int binCount = 0;
1954	>	for (Node<K,V>[] tab = table;;) {
1955	>	Node<K,V> f; int n, i, fh;
1956	>	if (tab == null || (n = tab.length) == 0)
1957	>	tab = initTable();
1958	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1959	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1960	>	delta = 1;
1961	>	val = value;
1962	>	break;
1963	>	}
1964	>	}
1965	>	else if ((fh = f.hash) == MOVED)
1966	>	tab = helpTransfer(tab, f);
1967	>	else {
1968	>	synchronized (f) {
1969	>	if (tabAt(tab, i) == f) {
1970	>	if (fh >= 0) {
1971	>	binCount = 1;
1972	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1973	>	K ek;
1974	>	if (e.hash == h &&
1975	>	((ek = e.key) == key ||
1976	>	(ek != null && key.equals(ek)))) {
1977	>	val = remappingFunction.apply(e.val, value);
1978	>	if (val != null)
1979	>	e.val = val;
1980	>	else {
1981	>	delta = -1;
1982	>	Node<K,V> en = e.next;
1983	>	if (pred != null)
1984	>	pred.next = en;
1985	>	else
1986	>	setTabAt(tab, i, en);
1987	>	}
1988	>	break;
1989	>	}
1990	>	pred = e;
1991	>	if ((e = e.next) == null) {
1992	>	delta = 1;
1993	>	val = value;
1994	>	pred.next =
1995	>	new Node<K,V>(h, key, val, null);
1996	>	break;
1997	>	}
1998	>	}
1999	>	}
2000	>	else if (f instanceof TreeBin) {
2001	>	binCount = 2;
2002	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2003	>	TreeNode<K,V> r = t.root;
2004	>	TreeNode<K,V> p = (r == null) ? null :
2005	>	r.findTreeNode(h, key, null);
2006	>	val = (p == null) ? value :
2007	>	remappingFunction.apply(p.val, value);
2008	>	if (val != null) {
2009	>	if (p != null)
2010	>	p.val = val;
2011	>	else {
2012	>	delta = 1;
2013	>	t.putTreeVal(h, key, val);
2014	>	}
2015	>	}
2016	>	else if (p != null) {
2017	>	delta = -1;
2018	>	if (t.removeTreeNode(p))
2019	>	setTabAt(tab, i, untreeify(t.first));
2020	>	}
2021	>	}
2022	>	}
2023	>	}
2024	>	if (binCount != 0) {
2025	>	if (binCount >= TREEIFY_THRESHOLD)
2026	>	treeifyBin(tab, i);
2027	>	break;
2028	>	}
2029	>	}
2030	>	}
2031	>	if (delta != 0)
2032	>	addCount((long)delta, binCount);
2033	>	return val;
2034		}
2035
2036	+	// Hashtable legacy methods
2037	+
2038		/**
2039	<	* Removes the key (and its corresponding value) from this map.
2040	<	* This method does nothing if the key is not in the map.
2039	>	* Legacy method testing if some key maps into the specified value
2040	>	* in this table.  This method is identical in functionality to
2041	>	* {@link #containsValue(Object)}, and exists solely to ensure
2042	>	* full compatibility with class {@link java.util.Hashtable},
2043	>	* which supported this method prior to introduction of the
2044	>	* Java Collections framework.
2045		*
2046	<	* @param  key the key that needs to be removed
2047	<	* @return the previous value associated with {@code key}, or
2048	<	*         {@code null} if there was no mapping for {@code key}
2049	<	* @throws NullPointerException if the specified key is null
2046	>	* @param  value a value to search for
2047	>	* @return {@code true} if and only if some key maps to the
2048	>	*         {@code value} argument in this table as
2049	>	*         determined by the {@code equals} method;
2050	>	*         {@code false} otherwise
2051	>	* @throws NullPointerException if the specified value is null
2052		*/
2053	<	@SuppressWarnings("unchecked") public V remove(Object key) {
2054	<	if (key == null)
2991	<	throw new NullPointerException();
2992	<	return (V)internalReplace(key, null, null);
2053	>	@Deprecated public boolean contains(Object value) {
2054	>	return containsValue(value);
2055		}
2056
2057		/**
2058	<	* {@inheritDoc}
2058	>	* Returns an enumeration of the keys in this table.
2059		*
2060	<	* @throws NullPointerException if the specified key is null
2060	>	* @return an enumeration of the keys in this table
2061	>	* @see #keySet()
2062		*/
2063	<	public boolean remove(Object key, Object value) {
2064	<	if (key == null)
2065	<	throw new NullPointerException();
2066	<	if (value == null)
3004	<	return false;
3005	<	return internalReplace(key, null, value) != null;
2063	>	public Enumeration<K> keys() {
2064	>	Node<K,V>[] t;
2065	>	int f = (t = table) == null ? 0 : t.length;
2066	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2067		}
2068
2069		/**
2070	<	* {@inheritDoc}
2070	>	* Returns an enumeration of the values in this table.
2071		*
2072	<	* @throws NullPointerException if any of the arguments are null
2072	>	* @return an enumeration of the values in this table
2073	>	* @see #values()
2074		*/
2075	<	public boolean replace(K key, V oldValue, V newValue) {
2076	<	if (key == null || oldValue == null || newValue == null)
2077	<	throw new NullPointerException();
2078	<	return internalReplace(key, newValue, oldValue) != null;
2075	>	public Enumeration<V> elements() {
2076	>	Node<K,V>[] t;
2077	>	int f = (t = table) == null ? 0 : t.length;
2078	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2079		}
2080
2081	+	// ConcurrentHashMapV8-only methods
2082	+
2083		/**
2084	<	* {@inheritDoc}
2084	>	* Returns the number of mappings. This method should be used
2085	>	* instead of {@link #size} because a ConcurrentHashMapV8 may
2086	>	* contain more mappings than can be represented as an int. The
2087	>	* value returned is an estimate; the actual count may differ if
2088	>	* there are concurrent insertions or removals.
2089		*
2090	<	* @return the previous value associated with the specified key,
2091	<	*         or {@code null} if there was no mapping for the key
3024	<	* @throws NullPointerException if the specified key or value is null
2090	>	* @return the number of mappings
2091	>	* @since 1.8
2092		*/
2093	<	@SuppressWarnings("unchecked") public V replace(K key, V value) {
2094	<	if (key == null || value == null)
2095	<	throw new NullPointerException();
3029	<	return (V)internalReplace(key, value, null);
2093	>	public long mappingCount() {
2094	>	long n = sumCount();
2095	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2096		}
2097
2098		/**
2099	<	* Removes all of the mappings from this map.
2099	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2100	>	* from the given type to {@code Boolean.TRUE}.
2101	>	*
2102	>	* @return the new set
2103	>	* @since 1.8
2104		*/
2105	<	public void clear() {
2106	<	internalClear();
2105	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2106	>	return new KeySetView<K,Boolean>
2107	>	(new ConcurrentHashMapV8<K,Boolean>(), Boolean.TRUE);
2108		}
2109
2110		/**
2111	<	* Returns a {@link Set} view of the keys contained in this map.
2112	<	* The set is backed by the map, so changes to the map are
3042	<	* reflected in the set, and vice-versa.
2111	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2112	>	* from the given type to {@code Boolean.TRUE}.
2113		*
2114	<	* @return the set view
2114	>	* @param initialCapacity The implementation performs internal
2115	>	* sizing to accommodate this many elements.
2116	>	* @return the new set
2117	>	* @throws IllegalArgumentException if the initial capacity of
2118	>	* elements is negative
2119	>	* @since 1.8
2120		*/
2121	<	public KeySetView<K,V> keySet() {
2122	<	KeySetView<K,V> ks = keySet;
2123	<	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2121	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2122	>	return new KeySetView<K,Boolean>
2123	>	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2124		}
2125
2126		/**
2127		* Returns a {@link Set} view of the keys in this map, using the
2128		* given common mapped value for any additions (i.e., {@link
2129	<	* Collection#add} and {@link Collection#addAll}). This is of
2130	<	* course only appropriate if it is acceptable to use the same
2131	<	* value for all additions from this view.
2129	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2130	>	* This is of course only appropriate if it is acceptable to use
2131	>	* the same value for all additions from this view.
2132		*
2133	<	* @param mappedValue the mapped value to use for any
3059	<	* additions.
2133	>	* @param mappedValue the mapped value to use for any additions
2134		* @return the set view
2135		* @throws NullPointerException if the mappedValue is null
2136		*/
#	Line 3066 | Line 2140 | public class ConcurrentHashMapV8<K, V>
2140		return new KeySetView<K,V>(this, mappedValue);
2141		}
2142
2143	+	/* ---------------- Special Nodes -------------- */
2144	+
2145		/**
2146	<	* Returns a {@link Collection} view of the values contained in this map.
3071	<	* The collection is backed by the map, so changes to the map are
3072	<	* reflected in the collection, and vice-versa.
2146	>	* A node inserted at head of bins during transfer operations.
2147		*/
2148	<	public ValuesView<K,V> values() {
2149	<	ValuesView<K,V> vs = values;
2150	<	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
2148	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2149	>	final Node<K,V>[] nextTable;
2150	>	ForwardingNode(Node<K,V>[] tab) {
2151	>	super(MOVED, null, null, null);
2152	>	this.nextTable = tab;
2153	>	}
2154	>
2155	>	Node<K,V> find(int h, Object k) {
2156	>	// loop to avoid arbitrarily deep recursion on forwarding nodes
2157	>	outer: for (Node<K,V>[] tab = nextTable;;) {
2158	>	Node<K,V> e; int n;
2159	>	if (k == null || tab == null || (n = tab.length) == 0 ||
2160	>	(e = tabAt(tab, (n - 1) & h)) == null)
2161	>	return null;
2162	>	for (;;) {
2163	>	int eh; K ek;
2164	>	if ((eh = e.hash) == h &&
2165	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2166	>	return e;
2167	>	if (eh < 0) {
2168	>	if (e instanceof ForwardingNode) {
2169	>	tab = ((ForwardingNode<K,V>)e).nextTable;
2170	>	continue outer;
2171	>	}
2172	>	else
2173	>	return e.find(h, k);
2174	>	}
2175	>	if ((e = e.next) == null)
2176	>	return null;
2177	>	}
2178	>	}
2179	>	}
2180		}
2181
2182		/**
2183	<	* Returns a {@link Set} view of the mappings contained in this map.
3081	<	* The set is backed by the map, so changes to the map are
3082	<	* reflected in the set, and vice-versa.  The set supports element
3083	<	* removal, which removes the corresponding mapping from the map,
3084	<	* via the {@code Iterator.remove}, {@code Set.remove},
3085	<	* {@code removeAll}, {@code retainAll}, and {@code clear}
3086	<	* operations.  It does not support the {@code add} or
3087	<	* {@code addAll} operations.
3088	<	*
3089	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
3090	<	* that will never throw {@link ConcurrentModificationException},
3091	<	* and guarantees to traverse elements as they existed upon
3092	<	* construction of the iterator, and may (but is not guaranteed to)
3093	<	* reflect any modifications subsequent to construction.
2183	>	* A place-holder node used in computeIfAbsent and compute
2184		*/
2185	<	public Set<Map.Entry<K,V>> entrySet() {
2186	<	EntrySetView<K,V> es = entrySet;
2187	<	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
2185	>	static final class ReservationNode<K,V> extends Node<K,V> {
2186	>	ReservationNode() {
2187	>	super(RESERVED, null, null, null);
2188	>	}
2189	>
2190	>	Node<K,V> find(int h, Object k) {
2191	>	return null;
2192	>	}
2193		}
2194
2195	+	/* ---------------- Table Initialization and Resizing -------------- */
2196	+
2197		/**
2198	<	* Returns an enumeration of the keys in this table.
3102	<	*
3103	<	* @return an enumeration of the keys in this table
3104	<	* @see #keySet()
2198	>	* Initializes table, using the size recorded in sizeCtl.
2199		*/
2200	<	public Enumeration<K> keys() {
2201	<	return new KeyIterator<K,V>(this);
2200	>	private final Node<K,V>[] initTable() {
2201	>	Node<K,V>[] tab; int sc;
2202	>	while ((tab = table) == null || tab.length == 0) {
2203	>	if ((sc = sizeCtl) < 0)
2204	>	Thread.yield(); // lost initialization race; just spin
2205	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2206	>	try {
2207	>	if ((tab = table) == null || tab.length == 0) {
2208	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2209	>	@SuppressWarnings("unchecked")
2210	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2211	>	table = tab = nt;
2212	>	sc = n - (n >>> 2);
2213	>	}
2214	>	} finally {
2215	>	sizeCtl = sc;
2216	>	}
2217	>	break;
2218	>	}
2219	>	}
2220	>	return tab;
2221		}
2222
2223		/**
2224	<	* Returns an enumeration of the values in this table.
2225	<	*
2226	<	* @return an enumeration of the values in this table
2227	<	* @see #values()
2224	>	* Adds to count, and if table is too small and not already
2225	>	* resizing, initiates transfer. If already resizing, helps
2226	>	* perform transfer if work is available.  Rechecks occupancy
2227	>	* after a transfer to see if another resize is already needed
2228	>	* because resizings are lagging additions.
2229	>	*
2230	>	* @param x the count to add
2231	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
2232	>	*/
2233	>	private final void addCount(long x, int check) {
2234	>	CounterCell[] as; long b, s;
2235	>	if ((as = counterCells) != null ||
2236	>	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2237	>	CounterHashCode hc; CounterCell a; long v; int m;
2238	>	boolean uncontended = true;
2239	>	if ((hc = threadCounterHashCode.get()) == null ||
2240	>	as == null || (m = as.length - 1) < 0 ||
2241	>	(a = as[m & hc.code]) == null ||
2242	>	!(uncontended =
2243	>	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
2244	>	fullAddCount(x, hc, uncontended);
2245	>	return;
2246	>	}
2247	>	if (check <= 1)
2248	>	return;
2249	>	s = sumCount();
2250	>	}
2251	>	if (check >= 0) {
2252	>	Node<K,V>[] tab, nt; int sc;
2253	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2254	>	tab.length < MAXIMUM_CAPACITY) {
2255	>	if (sc < 0) {
2256	>	if (sc == -1 || transferIndex <= 0 ||
2257	>	(nt = nextTable) == null)
2258	>	break;
2259	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2260	>	transfer(tab, nt);
2261	>	}
2262	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -2))
2263	>	transfer(tab, null);
2264	>	s = sumCount();
2265	>	}
2266	>	}
2267	>	}
2268	>
2269	>	/**
2270	>	* Helps transfer if a resize is in progress.
2271		*/
2272	<	public Enumeration<V> elements() {
2273	<	return new ValueIterator<K,V>(this);
2272	>	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2273	>	Node<K,V>[] nextTab; int sc;
2274	>	if ((f instanceof ForwardingNode) &&
2275	>	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2276	>	while (transferIndex > 0 && nextTab == nextTable &&
2277	>	(sc = sizeCtl) < -1) {
2278	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1)) {
2279	>	transfer(tab, nextTab);
2280	>	break;
2281	>	}
2282	>	}
2283	>	return nextTab;
2284	>	}
2285	>	return table;
2286		}
2287
2288		/**
2289	<	* Returns a partitionable iterator of the keys in this map.
2289	>	* Tries to presize table to accommodate the given number of elements.
2290		*
2291	<	* @return a partitionable iterator of the keys in this map
2291	>	* @param size number of elements (doesn't need to be perfectly accurate)
2292		*/
2293	<	public Spliterator<K> keySpliterator() {
2294	<	return new KeyIterator<K,V>(this);
2293	>	private final void tryPresize(int size) {
2294	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2295	>	tableSizeFor(size + (size >>> 1) + 1);
2296	>	int sc;
2297	>	while ((sc = sizeCtl) >= 0) {
2298	>	Node<K,V>[] tab = table; int n;
2299	>	if (tab == null || (n = tab.length) == 0) {
2300	>	n = (sc > c) ? sc : c;
2301	>	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2302	>	try {
2303	>	if (table == tab) {
2304	>	@SuppressWarnings("unchecked")
2305	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2306	>	table = nt;
2307	>	sc = n - (n >>> 2);
2308	>	}
2309	>	} finally {
2310	>	sizeCtl = sc;
2311	>	}
2312	>	}
2313	>	}
2314	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2315	>	break;
2316	>	else if (tab == table &&
2317	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2318	>	transfer(tab, null);
2319	>	}
2320		}
2321
2322		/**
2323	<	* Returns a partitionable iterator of the values in this map.
2324	<	*
3132	<	* @return a partitionable iterator of the values in this map
2323	>	* Moves and/or copies the nodes in each bin to new table. See
2324	>	* above for explanation.
2325		*/
2326	<	public Spliterator<V> valueSpliterator() {
2327	<	return new ValueIterator<K,V>(this);
2326	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2327	>	int n = tab.length, stride;
2328	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2329	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
2330	>	if (nextTab == null) {            // initiating
2331	>	try {
2332	>	@SuppressWarnings("unchecked")
2333	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n << 1];
2334	>	nextTab = nt;
2335	>	} catch (Throwable ex) {      // try to cope with OOME
2336	>	sizeCtl = Integer.MAX_VALUE;
2337	>	return;
2338	>	}
2339	>	nextTable = nextTab;
2340	>	transferIndex = n;
2341	>	}
2342	>	int nextn = nextTab.length;
2343	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2344	>	boolean advance = true;
2345	>	boolean finishing = false; // to ensure sweep before committing nextTab
2346	>	for (int i = 0, bound = 0;;) {
2347	>	Node<K,V> f; int fh;
2348	>	while (advance) {
2349	>	int nextIndex, nextBound;
2350	>	if (--i >= bound || finishing)
2351	>	advance = false;
2352	>	else if ((nextIndex = transferIndex) <= 0) {
2353	>	i = -1;
2354	>	advance = false;
2355	>	}
2356	>	else if (U.compareAndSwapInt
2357	>	(this, TRANSFERINDEX, nextIndex,
2358	>	nextBound = (nextIndex > stride ?
2359	>	nextIndex - stride : 0))) {
2360	>	bound = nextBound;
2361	>	i = nextIndex - 1;
2362	>	advance = false;
2363	>	}
2364	>	}
2365	>	if (i < 0 || i >= n || i + n >= nextn) {
2366	>	int sc;
2367	>	if (finishing) {
2368	>	nextTable = null;
2369	>	table = nextTab;
2370	>	sizeCtl = (n << 1) - (n >>> 1);
2371	>	return;
2372	>	}
2373	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, ++sc)) {
2374	>	if (sc != -1)
2375	>	return;
2376	>	finishing = advance = true;
2377	>	i = n; // recheck before commit
2378	>	}
2379	>	}
2380	>	else if ((f = tabAt(tab, i)) == null)
2381	>	advance = casTabAt(tab, i, null, fwd);
2382	>	else if ((fh = f.hash) == MOVED)
2383	>	advance = true; // already processed
2384	>	else {
2385	>	synchronized (f) {
2386	>	if (tabAt(tab, i) == f) {
2387	>	Node<K,V> ln, hn;
2388	>	if (fh >= 0) {
2389	>	int runBit = fh & n;
2390	>	Node<K,V> lastRun = f;
2391	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2392	>	int b = p.hash & n;
2393	>	if (b != runBit) {
2394	>	runBit = b;
2395	>	lastRun = p;
2396	>	}
2397	>	}
2398	>	if (runBit == 0) {
2399	>	ln = lastRun;
2400	>	hn = null;
2401	>	}
2402	>	else {
2403	>	hn = lastRun;
2404	>	ln = null;
2405	>	}
2406	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2407	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2408	>	if ((ph & n) == 0)
2409	>	ln = new Node<K,V>(ph, pk, pv, ln);
2410	>	else
2411	>	hn = new Node<K,V>(ph, pk, pv, hn);
2412	>	}
2413	>	setTabAt(nextTab, i, ln);
2414	>	setTabAt(nextTab, i + n, hn);
2415	>	setTabAt(tab, i, fwd);
2416	>	advance = true;
2417	>	}
2418	>	else if (f instanceof TreeBin) {
2419	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2420	>	TreeNode<K,V> lo = null, loTail = null;
2421	>	TreeNode<K,V> hi = null, hiTail = null;
2422	>	int lc = 0, hc = 0;
2423	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2424	>	int h = e.hash;
2425	>	TreeNode<K,V> p = new TreeNode<K,V>
2426	>	(h, e.key, e.val, null, null);
2427	>	if ((h & n) == 0) {
2428	>	if ((p.prev = loTail) == null)
2429	>	lo = p;
2430	>	else
2431	>	loTail.next = p;
2432	>	loTail = p;
2433	>	++lc;
2434	>	}
2435	>	else {
2436	>	if ((p.prev = hiTail) == null)
2437	>	hi = p;
2438	>	else
2439	>	hiTail.next = p;
2440	>	hiTail = p;
2441	>	++hc;
2442	>	}
2443	>	}
2444	>	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2445	>	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2446	>	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2447	>	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2448	>	setTabAt(nextTab, i, ln);
2449	>	setTabAt(nextTab, i + n, hn);
2450	>	setTabAt(tab, i, fwd);
2451	>	advance = true;
2452	>	}
2453	>	}
2454	>	}
2455	>	}
2456	>	}
2457		}
2458
2459	+	/* ---------------- Conversion from/to TreeBins -------------- */
2460	+
2461		/**
2462	<	* Returns a partitionable iterator of the entries in this map.
2463	<	*
3141	<	* @return a partitionable iterator of the entries in this map
2462	>	* Replaces all linked nodes in bin at given index unless table is
2463	>	* too small, in which case resizes instead.
2464		*/
2465	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2466	<	return new EntryIterator<K,V>(this);
2465	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2466	>	Node<K,V> b; int n, sc;
2467	>	if (tab != null) {
2468	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY) {
2469	>	if (tab == table && (sc = sizeCtl) >= 0 &&
2470	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2471	>	transfer(tab, null);
2472	>	}
2473	>	else if ((b = tabAt(tab, index)) != null && b.hash >= 0) {
2474	>	synchronized (b) {
2475	>	if (tabAt(tab, index) == b) {
2476	>	TreeNode<K,V> hd = null, tl = null;
2477	>	for (Node<K,V> e = b; e != null; e = e.next) {
2478	>	TreeNode<K,V> p =
2479	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2480	>	null, null);
2481	>	if ((p.prev = tl) == null)
2482	>	hd = p;
2483	>	else
2484	>	tl.next = p;
2485	>	tl = p;
2486	>	}
2487	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2488	>	}
2489	>	}
2490	>	}
2491	>	}
2492		}
2493
2494		/**
2495	<	* Returns the hash code value for this {@link Map}, i.e.,
3149	<	* the sum of, for each key-value pair in the map,
3150	<	* {@code key.hashCode() ^ value.hashCode()}.
3151	<	*
3152	<	* @return the hash code value for this map
2495	>	* Returns a list on non-TreeNodes replacing those in given list.
2496		*/
2497	<	public int hashCode() {
2498	<	int h = 0;
2499	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2500	<	Object v;
2501	<	while ((v = it.advance()) != null) {
2502	<	h += it.nextKey.hashCode() ^ v.hashCode();
2497	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2498	>	Node<K,V> hd = null, tl = null;
2499	>	for (Node<K,V> q = b; q != null; q = q.next) {
2500	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2501	>	if (tl == null)
2502	>	hd = p;
2503	>	else
2504	>	tl.next = p;
2505	>	tl = p;
2506		}
2507	<	return h;
2507	>	return hd;
2508		}
2509
2510	+	/* ---------------- TreeNodes -------------- */
2511	+
2512		/**
2513	<	* Returns a string representation of this map.  The string
3166	<	* representation consists of a list of key-value mappings (in no
3167	<	* particular order) enclosed in braces ("{@code {}}").  Adjacent
3168	<	* mappings are separated by the characters {@code ", "} (comma
3169	<	* and space).  Each key-value mapping is rendered as the key
3170	<	* followed by an equals sign ("{@code =}") followed by the
3171	<	* associated value.
3172	<	*
3173	<	* @return a string representation of this map
2513	>	* Nodes for use in TreeBins
2514		*/
2515	<	public String toString() {
2516	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2517	<	StringBuilder sb = new StringBuilder();
2518	<	sb.append('{');
2519	<	Object v;
2520	<	if ((v = it.advance()) != null) {
2521	<	for (;;) {
2522	<	Object k = it.nextKey;
2523	<	sb.append(k == this ? "(this Map)" : k);
2524	<	sb.append('=');
2525	<	sb.append(v == this ? "(this Map)" : v);
2526	<	if ((v = it.advance()) == null)
2515	>	static final class TreeNode<K,V> extends Node<K,V> {
2516	>	TreeNode<K,V> parent;  // red-black tree links
2517	>	TreeNode<K,V> left;
2518	>	TreeNode<K,V> right;
2519	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2520	>	boolean red;
2521	>
2522	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2523	>	TreeNode<K,V> parent) {
2524	>	super(hash, key, val, next);
2525	>	this.parent = parent;
2526	>	}
2527	>
2528	>	Node<K,V> find(int h, Object k) {
2529	>	return findTreeNode(h, k, null);
2530	>	}
2531	>
2532	>	/**
2533	>	* Returns the TreeNode (or null if not found) for the given key
2534	>	* starting at given root.
2535	>	*/
2536	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2537	>	if (k != null) {
2538	>	TreeNode<K,V> p = this;
2539	>	do  {
2540	>	int ph, dir; K pk; TreeNode<K,V> q;
2541	>	TreeNode<K,V> pl = p.left, pr = p.right;
2542	>	if ((ph = p.hash) > h)
2543	>	p = pl;
2544	>	else if (ph < h)
2545	>	p = pr;
2546	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2547	>	return p;
2548	>	else if (pl == null)
2549	>	p = pr;
2550	>	else if (pr == null)
2551	>	p = pl;
2552	>	else if ((kc != null ||
2553	>	(kc = comparableClassFor(k)) != null) &&
2554	>	(dir = compareComparables(kc, k, pk)) != 0)
2555	>	p = (dir < 0) ? pl : pr;
2556	>	else if ((q = pr.findTreeNode(h, k, kc)) != null)
2557	>	return q;
2558	>	else
2559	>	p = pl;
2560	>	} while (p != null);
2561	>	}
2562	>	return null;
2563	>	}
2564	>	}
2565	>
2566	>	/* ---------------- TreeBins -------------- */
2567	>
2568	>	/**
2569	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2570	>	* keys or values, but instead point to list of TreeNodes and
2571	>	* their root. They also maintain a parasitic read-write lock
2572	>	* forcing writers (who hold bin lock) to wait for readers (who do
2573	>	* not) to complete before tree restructuring operations.
2574	>	*/
2575	>	static final class TreeBin<K,V> extends Node<K,V> {
2576	>	TreeNode<K,V> root;
2577	>	volatile TreeNode<K,V> first;
2578	>	volatile Thread waiter;
2579	>	volatile int lockState;
2580	>	// values for lockState
2581	>	static final int WRITER = 1; // set while holding write lock
2582	>	static final int WAITER = 2; // set when waiting for write lock
2583	>	static final int READER = 4; // increment value for setting read lock
2584	>
2585	>	/**
2586	>	* Tie-breaking utility for ordering insertions when equal
2587	>	* hashCodes and non-comparable. We don't require a total
2588	>	* order, just a consistent insertion rule to maintain
2589	>	* equivalence across rebalancings. Tie-breaking further than
2590	>	* necessary simplifies testing a bit.
2591	>	*/
2592	>	static int tieBreakOrder(Object a, Object b) {
2593	>	int d;
2594	>	if (a == null || b == null ||
2595	>	(d = a.getClass().getName().
2596	>	compareTo(b.getClass().getName())) == 0)
2597	>	d = (System.identityHashCode(a) <= System.identityHashCode(b) ?
2598	>	-1 : 1);
2599	>	return d;
2600	>	}
2601	>
2602	>	/**
2603	>	* Creates bin with initial set of nodes headed by b.
2604	>	*/
2605	>	TreeBin(TreeNode<K,V> b) {
2606	>	super(TREEBIN, null, null, null);
2607	>	this.first = b;
2608	>	TreeNode<K,V> r = null;
2609	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2610	>	next = (TreeNode<K,V>)x.next;
2611	>	x.left = x.right = null;
2612	>	if (r == null) {
2613	>	x.parent = null;
2614	>	x.red = false;
2615	>	r = x;
2616	>	}
2617	>	else {
2618	>	K k = x.key;
2619	>	int h = x.hash;
2620	>	Class<?> kc = null;
2621	>	for (TreeNode<K,V> p = r;;) {
2622	>	int dir, ph;
2623	>	K pk = p.key;
2624	>	if ((ph = p.hash) > h)
2625	>	dir = -1;
2626	>	else if (ph < h)
2627	>	dir = 1;
2628	>	else if ((kc == null &&
2629	>	(kc = comparableClassFor(k)) == null) ||
2630	>	(dir = compareComparables(kc, k, pk)) == 0)
2631	>	dir = tieBreakOrder(k, pk);
2632	>	TreeNode<K,V> xp = p;
2633	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2634	>	x.parent = xp;
2635	>	if (dir <= 0)
2636	>	xp.left = x;
2637	>	else
2638	>	xp.right = x;
2639	>	r = balanceInsertion(r, x);
2640	>	break;
2641	>	}
2642	>	}
2643	>	}
2644	>	}
2645	>	this.root = r;
2646	>	assert checkInvariants(root);
2647	>	}
2648	>
2649	>	/**
2650	>	* Acquires write lock for tree restructuring.
2651	>	*/
2652	>	private final void lockRoot() {
2653	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2654	>	contendedLock(); // offload to separate method
2655	>	}
2656	>
2657	>	/**
2658	>	* Releases write lock for tree restructuring.
2659	>	*/
2660	>	private final void unlockRoot() {
2661	>	lockState = 0;
2662	>	}
2663	>
2664	>	/**
2665	>	* Possibly blocks awaiting root lock.
2666	>	*/
2667	>	private final void contendedLock() {
2668	>	boolean waiting = false;
2669	>	for (int s;;) {
2670	>	if (((s = lockState) & WRITER) == 0) {
2671	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2672	>	if (waiting)
2673	>	waiter = null;
2674	>	return;
2675	>	}
2676	>	}
2677	>	else if ((s & WAITER) == 0) {
2678	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2679	>	waiting = true;
2680	>	waiter = Thread.currentThread();
2681	>	}
2682	>	}
2683	>	else if (waiting)
2684	>	LockSupport.park(this);
2685	>	}
2686	>	}
2687	>
2688	>	/**
2689	>	* Returns matching node or null if none. Tries to search
2690	>	* using tree comparisons from root, but continues linear
2691	>	* search when lock not available.
2692	>	*/
2693	>	final Node<K,V> find(int h, Object k) {
2694	>	if (k != null) {
2695	>	for (Node<K,V> e = first; e != null; e = e.next) {
2696	>	int s; K ek;
2697	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2698	>	if (e.hash == h &&
2699	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2700	>	return e;
2701	>	}
2702	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2703	>	s + READER)) {
2704	>	TreeNode<K,V> r, p;
2705	>	try {
2706	>	p = ((r = root) == null ? null :
2707	>	r.findTreeNode(h, k, null));
2708	>	} finally {
2709	>	Thread w;
2710	>	int ls;
2711	>	do {} while (!U.compareAndSwapInt
2712	>	(this, LOCKSTATE,
2713	>	ls = lockState, ls - READER));
2714	>	if (ls == (READER|WAITER) && (w = waiter) != null)
2715	>	LockSupport.unpark(w);
2716	>	}
2717	>	return p;
2718	>	}
2719	>	}
2720	>	}
2721	>	return null;
2722	>	}
2723	>
2724	>	/**
2725	>	* Finds or adds a node.
2726	>	* @return null if added
2727	>	*/
2728	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2729	>	Class<?> kc = null;
2730	>	boolean searched = false;
2731	>	for (TreeNode<K,V> p = root;;) {
2732	>	int dir, ph; K pk;
2733	>	if (p == null) {
2734	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2735		break;
2736	<	sb.append(',').append(' ');
2736	>	}
2737	>	else if ((ph = p.hash) > h)
2738	>	dir = -1;
2739	>	else if (ph < h)
2740	>	dir = 1;
2741	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2742	>	return p;
2743	>	else if ((kc == null &&
2744	>	(kc = comparableClassFor(k)) == null) ||
2745	>	(dir = compareComparables(kc, k, pk)) == 0) {
2746	>	if (!searched) {
2747	>	TreeNode<K,V> q, ch;
2748	>	searched = true;
2749	>	if (((ch = p.left) != null &&
2750	>	(q = ch.findTreeNode(h, k, kc)) != null) ||
2751	>	((ch = p.right) != null &&
2752	>	(q = ch.findTreeNode(h, k, kc)) != null))
2753	>	return q;
2754	>	}
2755	>	dir = tieBreakOrder(k, pk);
2756	>	}
2757	>
2758	>	TreeNode<K,V> xp = p;
2759	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2760	>	TreeNode<K,V> x, f = first;
2761	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2762	>	if (f != null)
2763	>	f.prev = x;
2764	>	if (dir <= 0)
2765	>	xp.left = x;
2766	>	else
2767	>	xp.right = x;
2768	>	if (!xp.red)
2769	>	x.red = true;
2770	>	else {
2771	>	lockRoot();
2772	>	try {
2773	>	root = balanceInsertion(root, x);
2774	>	} finally {
2775	>	unlockRoot();
2776	>	}
2777	>	}
2778	>	break;
2779	>	}
2780	>	}
2781	>	assert checkInvariants(root);
2782	>	return null;
2783	>	}
2784	>
2785	>	/**
2786	>	* Removes the given node, that must be present before this
2787	>	* call.  This is messier than typical red-black deletion code
2788	>	* because we cannot swap the contents of an interior node
2789	>	* with a leaf successor that is pinned by "next" pointers
2790	>	* that are accessible independently of lock. So instead we
2791	>	* swap the tree linkages.
2792	>	*
2793	>	* @return true if now too small, so should be untreeified
2794	>	*/
2795	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2796	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2797	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2798	>	TreeNode<K,V> r, rl;
2799	>	if (pred == null)
2800	>	first = next;
2801	>	else
2802	>	pred.next = next;
2803	>	if (next != null)
2804	>	next.prev = pred;
2805	>	if (first == null) {
2806	>	root = null;
2807	>	return true;
2808	>	}
2809	>	if ((r = root) == null || r.right == null || // too small
2810	>	(rl = r.left) == null || rl.left == null)
2811	>	return true;
2812	>	lockRoot();
2813	>	try {
2814	>	TreeNode<K,V> replacement;
2815	>	TreeNode<K,V> pl = p.left;
2816	>	TreeNode<K,V> pr = p.right;
2817	>	if (pl != null && pr != null) {
2818	>	TreeNode<K,V> s = pr, sl;
2819	>	while ((sl = s.left) != null) // find successor
2820	>	s = sl;
2821	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2822	>	TreeNode<K,V> sr = s.right;
2823	>	TreeNode<K,V> pp = p.parent;
2824	>	if (s == pr) { // p was s's direct parent
2825	>	p.parent = s;
2826	>	s.right = p;
2827	>	}
2828	>	else {
2829	>	TreeNode<K,V> sp = s.parent;
2830	>	if ((p.parent = sp) != null) {
2831	>	if (s == sp.left)
2832	>	sp.left = p;
2833	>	else
2834	>	sp.right = p;
2835	>	}
2836	>	if ((s.right = pr) != null)
2837	>	pr.parent = s;
2838	>	}
2839	>	p.left = null;
2840	>	if ((p.right = sr) != null)
2841	>	sr.parent = p;
2842	>	if ((s.left = pl) != null)
2843	>	pl.parent = s;
2844	>	if ((s.parent = pp) == null)
2845	>	r = s;
2846	>	else if (p == pp.left)
2847	>	pp.left = s;
2848	>	else
2849	>	pp.right = s;
2850	>	if (sr != null)
2851	>	replacement = sr;
2852	>	else
2853	>	replacement = p;
2854	>	}
2855	>	else if (pl != null)
2856	>	replacement = pl;
2857	>	else if (pr != null)
2858	>	replacement = pr;
2859	>	else
2860	>	replacement = p;
2861	>	if (replacement != p) {
2862	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2863	>	if (pp == null)
2864	>	r = replacement;
2865	>	else if (p == pp.left)
2866	>	pp.left = replacement;
2867	>	else
2868	>	pp.right = replacement;
2869	>	p.left = p.right = p.parent = null;
2870	>	}
2871	>
2872	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2873	>
2874	>	if (p == replacement) {  // detach pointers
2875	>	TreeNode<K,V> pp;
2876	>	if ((pp = p.parent) != null) {
2877	>	if (p == pp.left)
2878	>	pp.left = null;
2879	>	else if (p == pp.right)
2880	>	pp.right = null;
2881	>	p.parent = null;
2882	>	}
2883	>	}
2884	>	} finally {
2885	>	unlockRoot();
2886	>	}
2887	>	assert checkInvariants(root);
2888	>	return false;
2889	>	}
2890	>
2891	>	/* ------------------------------------------------------------ */
2892	>	// Red-black tree methods, all adapted from CLR
2893	>
2894	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2895	>	TreeNode<K,V> p) {
2896	>	TreeNode<K,V> r, pp, rl;
2897	>	if (p != null && (r = p.right) != null) {
2898	>	if ((rl = p.right = r.left) != null)
2899	>	rl.parent = p;
2900	>	if ((pp = r.parent = p.parent) == null)
2901	>	(root = r).red = false;
2902	>	else if (pp.left == p)
2903	>	pp.left = r;
2904	>	else
2905	>	pp.right = r;
2906	>	r.left = p;
2907	>	p.parent = r;
2908	>	}
2909	>	return root;
2910	>	}
2911	>
2912	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2913	>	TreeNode<K,V> p) {
2914	>	TreeNode<K,V> l, pp, lr;
2915	>	if (p != null && (l = p.left) != null) {
2916	>	if ((lr = p.left = l.right) != null)
2917	>	lr.parent = p;
2918	>	if ((pp = l.parent = p.parent) == null)
2919	>	(root = l).red = false;
2920	>	else if (pp.right == p)
2921	>	pp.right = l;
2922	>	else
2923	>	pp.left = l;
2924	>	l.right = p;
2925	>	p.parent = l;
2926	>	}
2927	>	return root;
2928	>	}
2929	>
2930	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2931	>	TreeNode<K,V> x) {
2932	>	x.red = true;
2933	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2934	>	if ((xp = x.parent) == null) {
2935	>	x.red = false;
2936	>	return x;
2937	>	}
2938	>	else if (!xp.red || (xpp = xp.parent) == null)
2939	>	return root;
2940	>	if (xp == (xppl = xpp.left)) {
2941	>	if ((xppr = xpp.right) != null && xppr.red) {
2942	>	xppr.red = false;
2943	>	xp.red = false;
2944	>	xpp.red = true;
2945	>	x = xpp;
2946	>	}
2947	>	else {
2948	>	if (x == xp.right) {
2949	>	root = rotateLeft(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 = rotateRight(root, xpp);
2957	>	}
2958	>	}
2959	>	}
2960	>	}
2961	>	else {
2962	>	if (xppl != null && xppl.red) {
2963	>	xppl.red = false;
2964	>	xp.red = false;
2965	>	xpp.red = true;
2966	>	x = xpp;
2967	>	}
2968	>	else {
2969	>	if (x == xp.left) {
2970	>	root = rotateRight(root, x = xp);
2971	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2972	>	}
2973	>	if (xp != null) {
2974	>	xp.red = false;
2975	>	if (xpp != null) {
2976	>	xpp.red = true;
2977	>	root = rotateLeft(root, xpp);
2978	>	}
2979	>	}
2980	>	}
2981	>	}
2982	>	}
2983	>	}
2984	>
2985	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
2986	>	TreeNode<K,V> x) {
2987	>	for (TreeNode<K,V> xp, xpl, xpr;;)  {
2988	>	if (x == null || x == root)
2989	>	return root;
2990	>	else if ((xp = x.parent) == null) {
2991	>	x.red = false;
2992	>	return x;
2993	>	}
2994	>	else if (x.red) {
2995	>	x.red = false;
2996	>	return root;
2997	>	}
2998	>	else if ((xpl = xp.left) == x) {
2999	>	if ((xpr = xp.right) != null && xpr.red) {
3000	>	xpr.red = false;
3001	>	xp.red = true;
3002	>	root = rotateLeft(root, xp);
3003	>	xpr = (xp = x.parent) == null ? null : xp.right;
3004	>	}
3005	>	if (xpr == null)
3006	>	x = xp;
3007	>	else {
3008	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
3009	>	if ((sr == null || !sr.red) &&
3010	>	(sl == null || !sl.red)) {
3011	>	xpr.red = true;
3012	>	x = xp;
3013	>	}
3014	>	else {
3015	>	if (sr == null || !sr.red) {
3016	>	if (sl != null)
3017	>	sl.red = false;
3018	>	xpr.red = true;
3019	>	root = rotateRight(root, xpr);
3020	>	xpr = (xp = x.parent) == null ?
3021	>	null : xp.right;
3022	>	}
3023	>	if (xpr != null) {
3024	>	xpr.red = (xp == null) ? false : xp.red;
3025	>	if ((sr = xpr.right) != null)
3026	>	sr.red = false;
3027	>	}
3028	>	if (xp != null) {
3029	>	xp.red = false;
3030	>	root = rotateLeft(root, xp);
3031	>	}
3032	>	x = root;
3033	>	}
3034	>	}
3035	>	}
3036	>	else { // symmetric
3037	>	if (xpl != null && xpl.red) {
3038	>	xpl.red = false;
3039	>	xp.red = true;
3040	>	root = rotateRight(root, xp);
3041	>	xpl = (xp = x.parent) == null ? null : xp.left;
3042	>	}
3043	>	if (xpl == null)
3044	>	x = xp;
3045	>	else {
3046	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3047	>	if ((sl == null || !sl.red) &&
3048	>	(sr == null || !sr.red)) {
3049	>	xpl.red = true;
3050	>	x = xp;
3051	>	}
3052	>	else {
3053	>	if (sl == null || !sl.red) {
3054	>	if (sr != null)
3055	>	sr.red = false;
3056	>	xpl.red = true;
3057	>	root = rotateLeft(root, xpl);
3058	>	xpl = (xp = x.parent) == null ?
3059	>	null : xp.left;
3060	>	}
3061	>	if (xpl != null) {
3062	>	xpl.red = (xp == null) ? false : xp.red;
3063	>	if ((sl = xpl.left) != null)
3064	>	sl.red = false;
3065	>	}
3066	>	if (xp != null) {
3067	>	xp.red = false;
3068	>	root = rotateRight(root, xp);
3069	>	}
3070	>	x = root;
3071	>	}
3072	>	}
3073	>	}
3074	>	}
3075	>	}
3076	>
3077	>	/**
3078	>	* Recursive invariant check
3079	>	*/
3080	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3081	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3082	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3083	>	if (tb != null && tb.next != t)
3084	>	return false;
3085	>	if (tn != null && tn.prev != t)
3086	>	return false;
3087	>	if (tp != null && t != tp.left && t != tp.right)
3088	>	return false;
3089	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3090	>	return false;
3091	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3092	>	return false;
3093	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3094	>	return false;
3095	>	if (tl != null && !checkInvariants(tl))
3096	>	return false;
3097	>	if (tr != null && !checkInvariants(tr))
3098	>	return false;
3099	>	return true;
3100	>	}
3101	>
3102	>	private static final sun.misc.Unsafe U;
3103	>	private static final long LOCKSTATE;
3104	>	static {
3105	>	try {
3106	>	U = getUnsafe();
3107	>	Class<?> k = TreeBin.class;
3108	>	LOCKSTATE = U.objectFieldOffset
3109	>	(k.getDeclaredField("lockState"));
3110	>	} catch (Exception e) {
3111	>	throw new Error(e);
3112		}
3113		}
3191	–	return sb.append('}').toString();
3114		}
3115
3116	+	/* ----------------Table Traversal -------------- */
3117	+
3118		/**
3119	<	* Compares the specified object with this map for equality.
3120	<	* Returns {@code true} if the given object is a map with the same
3121	<	* mappings as this map.  This operation may return misleading
3122	<	* results if either map is concurrently modified during execution
3123	<	* of this method.
3119	>	* Records the table, its length, and current traversal index for a
3120	>	* traverser that must process a region of a forwarded table before
3121	>	* proceeding with current table.
3122	>	*/
3123	>	static final class TableStack<K,V> {
3124	>	int length;
3125	>	int index;
3126	>	Node<K,V>[] tab;
3127	>	TableStack<K,V> next;
3128	>	}
3129	>
3130	>	/**
3131	>	* Encapsulates traversal for methods such as containsValue; also
3132	>	* serves as a base class for other iterators and spliterators.
3133		*
3134	<	* @param o object to be compared for equality with this map
3135	<	* @return {@code true} if the specified object is equal to this map
3134	>	* Method advance visits once each still-valid node that was
3135	>	* reachable upon iterator construction. It might miss some that
3136	>	* were added to a bin after the bin was visited, which is OK wrt
3137	>	* consistency guarantees. Maintaining this property in the face
3138	>	* of possible ongoing resizes requires a fair amount of
3139	>	* bookkeeping state that is difficult to optimize away amidst
3140	>	* volatile accesses.  Even so, traversal maintains reasonable
3141	>	* throughput.
3142	>	*
3143	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3144	>	* However, if the table has been resized, then all future steps
3145	>	* must traverse both the bin at the current index as well as at
3146	>	* (index + baseSize); and so on for further resizings. To
3147	>	* paranoically cope with potential sharing by users of iterators
3148	>	* across threads, iteration terminates if a bounds checks fails
3149	>	* for a table read.
3150		*/
3151	<	public boolean equals(Object o) {
3152	<	if (o != this) {
3153	<	if (!(o instanceof Map))
3154	<	return false;
3155	<	Map<?,?> m = (Map<?,?>) o;
3156	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3157	<	Object val;
3158	<	while ((val = it.advance()) != null) {
3159	<	Object v = m.get(it.nextKey);
3160	<	if (v == null || (v != val && !v.equals(val)))
3161	<	return false;
3151	>	static class Traverser<K,V> {
3152	>	Node<K,V>[] tab;        // current table; updated if resized
3153	>	Node<K,V> next;         // the next entry to use
3154	>	TableStack<K,V> stack, spare; // to save/restore on ForwardingNodes
3155	>	int index;              // index of bin to use next
3156	>	int baseIndex;          // current index of initial table
3157	>	int baseLimit;          // index bound for initial table
3158	>	final int baseSize;     // initial table size
3159	>
3160	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3161	>	this.tab = tab;
3162	>	this.baseSize = size;
3163	>	this.baseIndex = this.index = index;
3164	>	this.baseLimit = limit;
3165	>	this.next = null;
3166	>	}
3167	>
3168	>	/**
3169	>	* Advances if possible, returning next valid node, or null if none.
3170	>	*/
3171	>	final Node<K,V> advance() {
3172	>	Node<K,V> e;
3173	>	if ((e = next) != null)
3174	>	e = e.next;
3175	>	for (;;) {
3176	>	Node<K,V>[] t; int i, n;  // must use locals in checks
3177	>	if (e != null)
3178	>	return next = e;
3179	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3180	>	(n = t.length) <= (i = index) || i < 0)
3181	>	return next = null;
3182	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
3183	>	if (e instanceof ForwardingNode) {
3184	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3185	>	e = null;
3186	>	pushState(t, i, n);
3187	>	continue;
3188	>	}
3189	>	else if (e instanceof TreeBin)
3190	>	e = ((TreeBin<K,V>)e).first;
3191	>	else
3192	>	e = null;
3193	>	}
3194	>	if (stack != null)
3195	>	recoverState(n);
3196	>	else if ((index = i + baseSize) >= n)
3197	>	index = ++baseIndex; // visit upper slots if present
3198		}
3199	<	for (Map.Entry<?,?> e : m.entrySet()) {
3200	<	Object mk, mv, v;
3201	<	if ((mk = e.getKey()) == null ||
3202	<	(mv = e.getValue()) == null ||
3203	<	(v = internalGet(mk)) == null ||
3204	<	(mv != v && !mv.equals(v)))
3205	<	return false;
3199	>	}
3200	>
3201	>	/**
3202	>	* Saves traversal state upon encountering a forwarding node.
3203	>	*/
3204	>	private void pushState(Node<K,V>[] t, int i, int n) {
3205	>	TableStack<K,V> s = spare;  // reuse if possible
3206	>	if (s != null)
3207	>	spare = s.next;
3208	>	else
3209	>	s = new TableStack<K,V>();
3210	>	s.tab = t;
3211	>	s.length = n;
3212	>	s.index = i;
3213	>	s.next = stack;
3214	>	stack = s;
3215	>	}
3216	>
3217	>	/**
3218	>	* Possibly pops traversal state.
3219	>	*
3220	>	* @param n length of current table
3221	>	*/
3222	>	private void recoverState(int n) {
3223	>	TableStack<K,V> s; int len;
3224	>	while ((s = stack) != null && (index += (len = s.length)) >= n) {
3225	>	n = len;
3226	>	index = s.index;
3227	>	tab = s.tab;
3228	>	s.tab = null;
3229	>	TableStack<K,V> next = s.next;
3230	>	s.next = spare; // save for reuse
3231	>	stack = next;
3232	>	spare = s;
3233		}
3234	+	if (s == null && (index += baseSize) >= n)
3235	+	index = ++baseIndex;
3236		}
3225	–	return true;
3237		}
3238
3239	<	/* ----------------Iterators -------------- */
3240	<
3241	<	@SuppressWarnings("serial") static final class KeyIterator<K,V> extends Traverser<K,V,Object>
3242	<	implements Spliterator<K>, Enumeration<K> {
3243	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3244	<	KeyIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3245	<	super(map, it, -1);
3239	>	/**
3240	>	* Base of key, value, and entry Iterators. Adds fields to
3241	>	* Traverser to support iterator.remove.
3242	>	*/
3243	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3244	>	final ConcurrentHashMapV8<K,V> map;
3245	>	Node<K,V> lastReturned;
3246	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3247	>	ConcurrentHashMapV8<K,V> map) {
3248	>	super(tab, size, index, limit);
3249	>	this.map = map;
3250	>	advance();
3251		}
3252	<	public KeyIterator<K,V> split() {
3253	<	if (nextKey != null)
3252	>
3253	>	public final boolean hasNext() { return next != null; }
3254	>	public final boolean hasMoreElements() { return next != null; }
3255	>
3256	>	public final void remove() {
3257	>	Node<K,V> p;
3258	>	if ((p = lastReturned) == null)
3259		throw new IllegalStateException();
3260	<	return new KeyIterator<K,V>(map, this);
3260	>	lastReturned = null;
3261	>	map.replaceNode(p.key, null, null);
3262		}
3263	<	@SuppressWarnings("unchecked") public final K next() {
3264	<	if (nextVal == null && advance() == null)
3263	>	}
3264	>
3265	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3266	>	implements Iterator<K>, Enumeration<K> {
3267	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3268	>	ConcurrentHashMapV8<K,V> map) {
3269	>	super(tab, index, size, limit, map);
3270	>	}
3271	>
3272	>	public final K next() {
3273	>	Node<K,V> p;
3274	>	if ((p = next) == null)
3275		throw new NoSuchElementException();
3276	<	Object k = nextKey;
3277	<	nextVal = null;
3278	<	return (K) k;
3276	>	K k = p.key;
3277	>	lastReturned = p;
3278	>	advance();
3279	>	return k;
3280		}
3281
3282		public final K nextElement() { return next(); }
3283		}
3284
3285	<	@SuppressWarnings("serial") static final class ValueIterator<K,V> extends Traverser<K,V,Object>
3286	<	implements Spliterator<V>, Enumeration<V> {
3287	<	ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3288	<	ValueIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3289	<	super(map, it, -1);
3257	<	}
3258	<	public ValueIterator<K,V> split() {
3259	<	if (nextKey != null)
3260	<	throw new IllegalStateException();
3261	<	return new ValueIterator<K,V>(map, this);
3285	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3286	>	implements Iterator<V>, Enumeration<V> {
3287	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3288	>	ConcurrentHashMapV8<K,V> map) {
3289	>	super(tab, index, size, limit, map);
3290		}
3291
3292	<	@SuppressWarnings("unchecked") public final V next() {
3293	<	Object v;
3294	<	if ((v = nextVal) == null && (v = advance()) == null)
3292	>	public final V next() {
3293	>	Node<K,V> p;
3294	>	if ((p = next) == null)
3295		throw new NoSuchElementException();
3296	<	nextVal = null;
3297	<	return (V) v;
3296	>	V v = p.val;
3297	>	lastReturned = p;
3298	>	advance();
3299	>	return v;
3300		}
3301
3302		public final V nextElement() { return next(); }
3303		}
3304
3305	<	@SuppressWarnings("serial") static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3306	<	implements Spliterator<Map.Entry<K,V>> {
3307	<	EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3308	<	EntryIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3309	<	super(map, it, -1);
3280	<	}
3281	<	public EntryIterator<K,V> split() {
3282	<	if (nextKey != null)
3283	<	throw new IllegalStateException();
3284	<	return new EntryIterator<K,V>(map, this);
3305	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3306	>	implements Iterator<Map.Entry<K,V>> {
3307	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3308	>	ConcurrentHashMapV8<K,V> map) {
3309	>	super(tab, index, size, limit, map);
3310		}
3311
3312	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3313	<	Object v;
3314	<	if ((v = nextVal) == null && (v = advance()) == null)
3312	>	public final Map.Entry<K,V> next() {
3313	>	Node<K,V> p;
3314	>	if ((p = next) == null)
3315		throw new NoSuchElementException();
3316	<	Object k = nextKey;
3317	<	nextVal = null;
3318	<	return new MapEntry<K,V>((K)k, (V)v, map);
3316	>	K k = p.key;
3317	>	V v = p.val;
3318	>	lastReturned = p;
3319	>	advance();
3320	>	return new MapEntry<K,V>(k, v, map);
3321		}
3322		}
3323
3324		/**
3325	<	* Exported Entry for iterators
3325	>	* Exported Entry for EntryIterator
3326		*/
3327	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3327	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3328		final K key; // non-null
3329		V val;       // non-null
3330	<	final ConcurrentHashMapV8<K, V> map;
3331	<	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3330	>	final ConcurrentHashMapV8<K,V> map;
3331	>	MapEntry(K key, V val, ConcurrentHashMapV8<K,V> map) {
3332		this.key = key;
3333		this.val = val;
3334		this.map = map;
3335		}
3336	<	public final K getKey()       { return key; }
3337	<	public final V getValue()     { return val; }
3338	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3339	<	public final String toString(){ return key + "=" + val; }
3336	>	public K getKey()        { return key; }
3337	>	public V getValue()      { return val; }
3338	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3339	>	public String toString() { return key + "=" + val; }
3340
3341	<	public final boolean equals(Object o) {
3341	>	public boolean equals(Object o) {
3342		Object k, v; Map.Entry<?,?> e;
3343		return ((o instanceof Map.Entry) &&
3344		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3325 | Line 3352 | public class ConcurrentHashMapV8<K, V>
3352		* value to return is somewhat arbitrary here. Since we do not
3353		* necessarily track asynchronous changes, the most recent
3354		* "previous" value could be different from what we return (or
3355	<	* could even have been removed in which case the put will
3355	>	* could even have been removed, in which case the put will
3356		* re-establish). We do not and cannot guarantee more.
3357		*/
3358	<	public final V setValue(V value) {
3358	>	public V setValue(V value) {
3359		if (value == null) throw new NullPointerException();
3360		V v = val;
3361		val = value;
#	Line 3337 | Line 3364 | public class ConcurrentHashMapV8<K, V>
3364		}
3365		}
3366
3367	<	/**
3368	<	* Returns exportable snapshot entry for the given key and value
3369	<	* when write-through can't or shouldn't be used.
3370	<	*/
3371	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
3372	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
3373	<	}
3367	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3368	>	implements ConcurrentHashMapSpliterator<K> {
3369	>	long est;               // size estimate
3370	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3371	>	long est) {
3372	>	super(tab, size, index, limit);
3373	>	this.est = est;
3374	>	}
3375	>
3376	>	public ConcurrentHashMapSpliterator<K> trySplit() {
3377	>	int i, f, h;
3378	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3379	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3380	>	f, est >>>= 1);
3381	>	}
3382
3383	<	/* ---------------- Serialization Support -------------- */
3383	>	public void forEachRemaining(Action<? super K> action) {
3384	>	if (action == null) throw new NullPointerException();
3385	>	for (Node<K,V> p; (p = advance()) != null;)
3386	>	action.apply(p.key);
3387	>	}
3388	>
3389	>	public boolean tryAdvance(Action<? super K> action) {
3390	>	if (action == null) throw new NullPointerException();
3391	>	Node<K,V> p;
3392	>	if ((p = advance()) == null)
3393	>	return false;
3394	>	action.apply(p.key);
3395	>	return true;
3396	>	}
3397	>
3398	>	public long estimateSize() { return est; }
3399
3350	–	/**
3351	–	* Stripped-down version of helper class used in previous version,
3352	–	* declared for the sake of serialization compatibility
3353	–	*/
3354	–	static class Segment<K,V> implements Serializable {
3355	–	private static final long serialVersionUID = 2249069246763182397L;
3356	–	final float loadFactor;
3357	–	Segment(float lf) { this.loadFactor = lf; }
3400		}
3401
3402	<	/**
3403	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
3404	<	* stream (i.e., serializes it).
3405	<	* @param s the stream
3406	<	* @serialData
3407	<	* the key (Object) and value (Object)
3408	<	* for each key-value mapping, followed by a null pair.
3367	<	* The key-value mappings are emitted in no particular order.
3368	<	*/
3369	<	@SuppressWarnings("unchecked") private void writeObject(java.io.ObjectOutputStream s)
3370	<	throws java.io.IOException {
3371	<	if (segments == null) { // for serialization compatibility
3372	<	segments = (Segment<K,V>[])
3373	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
3374	<	for (int i = 0; i < segments.length; ++i)
3375	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
3376	<	}
3377	<	s.defaultWriteObject();
3378	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3379	<	Object v;
3380	<	while ((v = it.advance()) != null) {
3381	<	s.writeObject(it.nextKey);
3382	<	s.writeObject(v);
3402	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3403	>	implements ConcurrentHashMapSpliterator<V> {
3404	>	long est;               // size estimate
3405	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3406	>	long est) {
3407	>	super(tab, size, index, limit);
3408	>	this.est = est;
3409		}
3384	–	s.writeObject(null);
3385	–	s.writeObject(null);
3386	–	segments = null; // throw away
3387	–	}
3410
3411	<	/**
3412	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3413	<	* @param s the stream
3414	<	*/
3415	<	@SuppressWarnings("unchecked") private void readObject(java.io.ObjectInputStream s)
3416	<	throws java.io.IOException, ClassNotFoundException {
3395	<	s.defaultReadObject();
3396	<	this.segments = null; // unneeded
3397	<	// initialize transient final field
3398	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
3411	>	public ConcurrentHashMapSpliterator<V> trySplit() {
3412	>	int i, f, h;
3413	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3414	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3415	>	f, est >>>= 1);
3416	>	}
3417
3418	<	// Create all nodes, then place in table once size is known
3419	<	long size = 0L;
3420	<	Node p = null;
3421	<	for (;;) {
3404	<	K k = (K) s.readObject();
3405	<	V v = (V) s.readObject();
3406	<	if (k != null && v != null) {
3407	<	int h = spread(k.hashCode());
3408	<	p = new Node(h, k, v, p);
3409	<	++size;
3410	<	}
3411	<	else
3412	<	break;
3418	>	public void forEachRemaining(Action<? super V> action) {
3419	>	if (action == null) throw new NullPointerException();
3420	>	for (Node<K,V> p; (p = advance()) != null;)
3421	>	action.apply(p.val);
3422		}
3423	<	if (p != null) {
3424	<	boolean init = false;
3425	<	int n;
3426	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3427	<	n = MAXIMUM_CAPACITY;
3428	<	else {
3429	<	int sz = (int)size;
3430	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
3422	<	}
3423	<	int sc = sizeCtl;
3424	<	boolean collide = false;
3425	<	if (n > sc &&
3426	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
3427	<	try {
3428	<	if (table == null) {
3429	<	init = true;
3430	<	Node[] tab = new Node[n];
3431	<	int mask = n - 1;
3432	<	while (p != null) {
3433	<	int j = p.hash & mask;
3434	<	Node next = p.next;
3435	<	Node q = p.next = tabAt(tab, j);
3436	<	setTabAt(tab, j, p);
3437	<	if (!collide && q != null && q.hash == p.hash)
3438	<	collide = true;
3439	<	p = next;
3440	<	}
3441	<	table = tab;
3442	<	counter.add(size);
3443	<	sc = n - (n >>> 2);
3444	<	}
3445	<	} finally {
3446	<	sizeCtl = sc;
3447	<	}
3448	<	if (collide) { // rescan and convert to TreeBins
3449	<	Node[] tab = table;
3450	<	for (int i = 0; i < tab.length; ++i) {
3451	<	int c = 0;
3452	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
3453	<	if (++c > TREE_THRESHOLD &&
3454	<	(e.key instanceof Comparable)) {
3455	<	replaceWithTreeBin(tab, i, e.key);
3456	<	break;
3457	<	}
3458	<	}
3459	<	}
3460	<	}
3461	<	}
3462	<	if (!init) { // Can only happen if unsafely published.
3463	<	while (p != null) {
3464	<	internalPut(p.key, p.val);
3465	<	p = p.next;
3466	<	}
3467	<	}
3423	>
3424	>	public boolean tryAdvance(Action<? super V> action) {
3425	>	if (action == null) throw new NullPointerException();
3426	>	Node<K,V> p;
3427	>	if ((p = advance()) == null)
3428	>	return false;
3429	>	action.apply(p.val);
3430	>	return true;
3431		}
3432	+
3433	+	public long estimateSize() { return est; }
3434	+
3435		}
3436
3437	+	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3438	+	implements ConcurrentHashMapSpliterator<Map.Entry<K,V>> {
3439	+	final ConcurrentHashMapV8<K,V> map; // To export MapEntry
3440	+	long est;               // size estimate
3441	+	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3442	+	long est, ConcurrentHashMapV8<K,V> map) {
3443	+	super(tab, size, index, limit);
3444	+	this.map = map;
3445	+	this.est = est;
3446	+	}
3447
3448	<	// -------------------------------------------------------
3448	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> trySplit() {
3449	>	int i, f, h;
3450	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3451	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3452	>	f, est >>>= 1, map);
3453	>	}
3454
3455	<	// Sams
3456	<	/** Interface describing a void action of one argument */
3457	<	public interface Action<A> { void apply(A a); }
3458	<	/** Interface describing a void action of two arguments */
3459	<	public interface BiAction<A,B> { void apply(A a, B b); }
3460	<	/** Interface describing a function of one argument */
3461	<	public interface Fun<A,T> { T apply(A a); }
3462	<	/** Interface describing a function of two arguments */
3463	<	public interface BiFun<A,B,T> { T apply(A a, B b); }
3464	<	/** Interface describing a function of no arguments */
3465	<	public interface Generator<T> { T apply(); }
3466	<	/** Interface describing a function mapping its argument to a double */
3467	<	public interface ObjectToDouble<A> { double apply(A a); }
3468	<	/** Interface describing a function mapping its argument to a long */
3488	<	public interface ObjectToLong<A> { long apply(A a); }
3489	<	/** Interface describing a function mapping its argument to an int */
3490	<	public interface ObjectToInt<A> {int apply(A a); }
3491	<	/** Interface describing a function mapping two arguments to a double */
3492	<	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
3493	<	/** Interface describing a function mapping two arguments to a long */
3494	<	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
3495	<	/** Interface describing a function mapping two arguments to an int */
3496	<	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
3497	<	/** Interface describing a function mapping a double to a double */
3498	<	public interface DoubleToDouble { double apply(double a); }
3499	<	/** Interface describing a function mapping a long to a long */
3500	<	public interface LongToLong { long apply(long a); }
3501	<	/** Interface describing a function mapping an int to an int */
3502	<	public interface IntToInt { int apply(int a); }
3503	<	/** Interface describing a function mapping two doubles to a double */
3504	<	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3505	<	/** Interface describing a function mapping two longs to a long */
3506	<	public interface LongByLongToLong { long apply(long a, long b); }
3507	<	/** Interface describing a function mapping two ints to an int */
3508	<	public interface IntByIntToInt { int apply(int a, int b); }
3455	>	public void forEachRemaining(Action<? super Map.Entry<K,V>> action) {
3456	>	if (action == null) throw new NullPointerException();
3457	>	for (Node<K,V> p; (p = advance()) != null; )
3458	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3459	>	}
3460	>
3461	>	public boolean tryAdvance(Action<? super Map.Entry<K,V>> action) {
3462	>	if (action == null) throw new NullPointerException();
3463	>	Node<K,V> p;
3464	>	if ((p = advance()) == null)
3465	>	return false;
3466	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3467	>	return true;
3468	>	}
3469
3470	+	public long estimateSize() { return est; }
3471
3472	<	// -------------------------------------------------------
3472	>	}
3473	>
3474	>	// Parallel bulk operations
3475	>
3476	>	/**
3477	>	* Computes initial batch value for bulk tasks. The returned value
3478	>	* is approximately exp2 of the number of times (minus one) to
3479	>	* split task by two before executing leaf action. This value is
3480	>	* faster to compute and more convenient to use as a guide to
3481	>	* splitting than is the depth, since it is used while dividing by
3482	>	* two anyway.
3483	>	*/
3484	>	final int batchFor(long b) {
3485	>	long n;
3486	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3487	>	return 0;
3488	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3489	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3490	>	}
3491
3492		/**
3493		* Performs the given action for each (key, value).
3494		*
3495	+	* @param parallelismThreshold the (estimated) number of elements
3496	+	* needed for this operation to be executed in parallel
3497		* @param action the action
3498	+	* @since 1.8
3499		*/
3500	<	public void forEach(BiAction<K,V> action) {
3501	<	ForkJoinTasks.forEach
3502	<	(this, action).invoke();
3500	>	public void forEach(long parallelismThreshold,
3501	>	BiAction<? super K,? super V> action) {
3502	>	if (action == null) throw new NullPointerException();
3503	>	new ForEachMappingTask<K,V>
3504	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3505	>	action).invoke();
3506		}
3507
3508		/**
3509		* Performs the given action for each non-null transformation
3510		* of each (key, value).
3511		*
3512	+	* @param parallelismThreshold the (estimated) number of elements
3513	+	* needed for this operation to be executed in parallel
3514		* @param transformer a function returning the transformation
3515	<	* for an element, or null of there is no transformation (in
3516	<	* which case the action is not applied).
3515	>	* for an element, or null if there is no transformation (in
3516	>	* which case the action is not applied)
3517		* @param action the action
3518	+	* @since 1.8
3519		*/
3520	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3521	<	Action<U> action) {
3522	<	ForkJoinTasks.forEach
3523	<	(this, transformer, action).invoke();
3520	>	public <U> void forEach(long parallelismThreshold,
3521	>	BiFun<? super K, ? super V, ? extends U> transformer,
3522	>	Action<? super U> action) {
3523	>	if (transformer == null || action == null)
3524	>	throw new NullPointerException();
3525	>	new ForEachTransformedMappingTask<K,V,U>
3526	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3527	>	transformer, action).invoke();
3528		}
3529
3530		/**
#	Line 3542 | Line 3534 | public class ConcurrentHashMapV8<K, V>
3534		* results of any other parallel invocations of the search
3535		* function are ignored.
3536		*
3537	+	* @param parallelismThreshold the (estimated) number of elements
3538	+	* needed for this operation to be executed in parallel
3539		* @param searchFunction a function returning a non-null
3540		* result on success, else null
3541		* @return a non-null result from applying the given search
3542		* function on each (key, value), or null if none
3543	+	* @since 1.8
3544		*/
3545	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3546	<	return ForkJoinTasks.search
3547	<	(this, searchFunction).invoke();
3545	>	public <U> U search(long parallelismThreshold,
3546	>	BiFun<? super K, ? super V, ? extends U> searchFunction) {
3547	>	if (searchFunction == null) throw new NullPointerException();
3548	>	return new SearchMappingsTask<K,V,U>
3549	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3550	>	searchFunction, new AtomicReference<U>()).invoke();
3551		}
3552
3553		/**
#	Line 3557 | Line 3555 | public class ConcurrentHashMapV8<K, V>
3555		* of all (key, value) pairs using the given reducer to
3556		* combine values, or null if none.
3557		*
3558	+	* @param parallelismThreshold the (estimated) number of elements
3559	+	* needed for this operation to be executed in parallel
3560		* @param transformer a function returning the transformation
3561	<	* for an element, or null of there is no transformation (in
3562	<	* which case it is not combined).
3561	>	* for an element, or null if there is no transformation (in
3562	>	* which case it is not combined)
3563		* @param reducer a commutative associative combining function
3564		* @return the result of accumulating the given transformation
3565		* of all (key, value) pairs
3566	+	* @since 1.8
3567		*/
3568	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3568	>	public <U> U reduce(long parallelismThreshold,
3569	>	BiFun<? super K, ? super V, ? extends U> transformer,
3570		BiFun<? super U, ? super U, ? extends U> reducer) {
3571	<	return ForkJoinTasks.reduce
3572	<	(this, transformer, reducer).invoke();
3571	>	if (transformer == null || reducer == null)
3572	>	throw new NullPointerException();
3573	>	return new MapReduceMappingsTask<K,V,U>
3574	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3575	>	null, transformer, reducer).invoke();
3576		}
3577
3578		/**
#	Line 3575 | Line 3580 | public class ConcurrentHashMapV8<K, V>
3580		* of all (key, value) pairs using the given reducer to
3581		* combine values, and the given basis as an identity value.
3582		*
3583	+	* @param parallelismThreshold the (estimated) number of elements
3584	+	* needed for this operation to be executed in parallel
3585		* @param transformer a function returning the transformation
3586		* for an element
3587		* @param basis the identity (initial default value) for the reduction
3588		* @param reducer a commutative associative combining function
3589		* @return the result of accumulating the given transformation
3590		* of all (key, value) pairs
3591	+	* @since 1.8
3592		*/
3593	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3593	>	public double reduceToDouble(long parallelismThreshold,
3594	>	ObjectByObjectToDouble<? super K, ? super V> transformer,
3595		double basis,
3596		DoubleByDoubleToDouble reducer) {
3597	<	return ForkJoinTasks.reduceToDouble
3598	<	(this, transformer, basis, reducer).invoke();
3597	>	if (transformer == null || reducer == null)
3598	>	throw new NullPointerException();
3599	>	return new MapReduceMappingsToDoubleTask<K,V>
3600	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3601	>	null, transformer, basis, reducer).invoke();
3602		}
3603
3604		/**
#	Line 3594 | Line 3606 | public class ConcurrentHashMapV8<K, V>
3606		* of all (key, value) pairs using the given reducer to
3607		* combine values, and the given basis as an identity value.
3608		*
3609	+	* @param parallelismThreshold the (estimated) number of elements
3610	+	* needed for this operation to be executed in parallel
3611		* @param transformer a function returning the transformation
3612		* for an element
3613		* @param basis the identity (initial default value) for the reduction
3614		* @param reducer a commutative associative combining function
3615		* @return the result of accumulating the given transformation
3616		* of all (key, value) pairs
3617	+	* @since 1.8
3618		*/
3619	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3619	>	public long reduceToLong(long parallelismThreshold,
3620	>	ObjectByObjectToLong<? super K, ? super V> transformer,
3621		long basis,
3622		LongByLongToLong reducer) {
3623	<	return ForkJoinTasks.reduceToLong
3624	<	(this, transformer, basis, reducer).invoke();
3623	>	if (transformer == null || reducer == null)
3624	>	throw new NullPointerException();
3625	>	return new MapReduceMappingsToLongTask<K,V>
3626	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3627	>	null, transformer, basis, reducer).invoke();
3628		}
3629
3630		/**
#	Line 3613 | Line 3632 | public class ConcurrentHashMapV8<K, V>
3632		* of all (key, value) pairs using the given reducer to
3633		* combine values, and the given basis as an identity value.
3634		*
3635	+	* @param parallelismThreshold the (estimated) number of elements
3636	+	* needed for this operation to be executed in parallel
3637		* @param transformer a function returning the transformation
3638		* for an element
3639		* @param basis the identity (initial default value) for the reduction
3640		* @param reducer a commutative associative combining function
3641		* @return the result of accumulating the given transformation
3642		* of all (key, value) pairs
3643	+	* @since 1.8
3644		*/
3645	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3645	>	public int reduceToInt(long parallelismThreshold,
3646	>	ObjectByObjectToInt<? super K, ? super V> transformer,
3647		int basis,
3648		IntByIntToInt reducer) {
3649	<	return ForkJoinTasks.reduceToInt
3650	<	(this, transformer, basis, reducer).invoke();
3649	>	if (transformer == null || reducer == null)
3650	>	throw new NullPointerException();
3651	>	return new MapReduceMappingsToIntTask<K,V>
3652	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3653	>	null, transformer, basis, reducer).invoke();
3654		}
3655
3656		/**
3657		* Performs the given action for each key.
3658		*
3659	+	* @param parallelismThreshold the (estimated) number of elements
3660	+	* needed for this operation to be executed in parallel
3661		* @param action the action
3662	+	* @since 1.8
3663		*/
3664	<	public void forEachKey(Action<K> action) {
3665	<	ForkJoinTasks.forEachKey
3666	<	(this, action).invoke();
3664	>	public void forEachKey(long parallelismThreshold,
3665	>	Action<? super K> action) {
3666	>	if (action == null) throw new NullPointerException();
3667	>	new ForEachKeyTask<K,V>
3668	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3669	>	action).invoke();
3670		}
3671
3672		/**
3673		* Performs the given action for each non-null transformation
3674		* of each key.
3675		*
3676	+	* @param parallelismThreshold the (estimated) number of elements
3677	+	* needed for this operation to be executed in parallel
3678		* @param transformer a function returning the transformation
3679	<	* for an element, or null of there is no transformation (in
3680	<	* which case the action is not applied).
3679	>	* for an element, or null if there is no transformation (in
3680	>	* which case the action is not applied)
3681		* @param action the action
3682	+	* @since 1.8
3683		*/
3684	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3685	<	Action<U> action) {
3686	<	ForkJoinTasks.forEachKey
3687	<	(this, transformer, action).invoke();
3684	>	public <U> void forEachKey(long parallelismThreshold,
3685	>	Fun<? super K, ? extends U> transformer,
3686	>	Action<? super U> action) {
3687	>	if (transformer == null || action == null)
3688	>	throw new NullPointerException();
3689	>	new ForEachTransformedKeyTask<K,V,U>
3690	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3691	>	transformer, action).invoke();
3692		}
3693
3694		/**
#	Line 3659 | Line 3698 | public class ConcurrentHashMapV8<K, V>
3698		* any other parallel invocations of the search function are
3699		* ignored.
3700		*
3701	+	* @param parallelismThreshold the (estimated) number of elements
3702	+	* needed for this operation to be executed in parallel
3703		* @param searchFunction a function returning a non-null
3704		* result on success, else null
3705		* @return a non-null result from applying the given search
3706		* function on each key, or null if none
3707	+	* @since 1.8
3708		*/
3709	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3710	<	return ForkJoinTasks.searchKeys
3711	<	(this, searchFunction).invoke();
3709	>	public <U> U searchKeys(long parallelismThreshold,
3710	>	Fun<? super K, ? extends U> searchFunction) {
3711	>	if (searchFunction == null) throw new NullPointerException();
3712	>	return new SearchKeysTask<K,V,U>
3713	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3714	>	searchFunction, new AtomicReference<U>()).invoke();
3715		}
3716
3717		/**
3718		* Returns the result of accumulating all keys using the given
3719		* reducer to combine values, or null if none.
3720		*
3721	+	* @param parallelismThreshold the (estimated) number of elements
3722	+	* needed for this operation to be executed in parallel
3723		* @param reducer a commutative associative combining function
3724		* @return the result of accumulating all keys using the given
3725		* reducer to combine values, or null if none
3726	+	* @since 1.8
3727		*/
3728	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3729	<	return ForkJoinTasks.reduceKeys
3730	<	(this, reducer).invoke();
3728	>	public K reduceKeys(long parallelismThreshold,
3729	>	BiFun<? super K, ? super K, ? extends K> reducer) {
3730	>	if (reducer == null) throw new NullPointerException();
3731	>	return new ReduceKeysTask<K,V>
3732	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3733	>	null, reducer).invoke();
3734		}
3735
3736		/**
#	Line 3687 | Line 3738 | public class ConcurrentHashMapV8<K, V>
3738		* of all keys using the given reducer to combine values, or
3739		* null if none.
3740		*
3741	+	* @param parallelismThreshold the (estimated) number of elements
3742	+	* needed for this operation to be executed in parallel
3743		* @param transformer a function returning the transformation
3744	<	* for an element, or null of there is no transformation (in
3745	<	* which case it is not combined).
3744	>	* for an element, or null if there is no transformation (in
3745	>	* which case it is not combined)
3746		* @param reducer a commutative associative combining function
3747		* @return the result of accumulating the given transformation
3748		* of all keys
3749	+	* @since 1.8
3750		*/
3751	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3752	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3753	<	return ForkJoinTasks.reduceKeys
3754	<	(this, transformer, reducer).invoke();
3751	>	public <U> U reduceKeys(long parallelismThreshold,
3752	>	Fun<? super K, ? extends U> transformer,
3753	>	BiFun<? super U, ? super U, ? extends U> reducer) {
3754	>	if (transformer == null || reducer == null)
3755	>	throw new NullPointerException();
3756	>	return new MapReduceKeysTask<K,V,U>
3757	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3758	>	null, transformer, reducer).invoke();
3759		}
3760
3761		/**
#	Line 3705 | Line 3763 | public class ConcurrentHashMapV8<K, V>
3763		* of all keys using the given reducer to combine values, and
3764		* the given basis as an identity value.
3765		*
3766	+	* @param parallelismThreshold the (estimated) number of elements
3767	+	* needed for this operation to be executed in parallel
3768		* @param transformer a function returning the transformation
3769		* for an element
3770		* @param basis the identity (initial default value) for the reduction
3771		* @param reducer a commutative associative combining function
3772	<	* @return  the result of accumulating the given transformation
3772	>	* @return the result of accumulating the given transformation
3773		* of all keys
3774	+	* @since 1.8
3775		*/
3776	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3776	>	public double reduceKeysToDouble(long parallelismThreshold,
3777	>	ObjectToDouble<? super K> transformer,
3778		double basis,
3779		DoubleByDoubleToDouble reducer) {
3780	<	return ForkJoinTasks.reduceKeysToDouble
3781	<	(this, transformer, basis, reducer).invoke();
3780	>	if (transformer == null || reducer == null)
3781	>	throw new NullPointerException();
3782	>	return new MapReduceKeysToDoubleTask<K,V>
3783	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3784	>	null, transformer, basis, reducer).invoke();
3785		}
3786
3787		/**
#	Line 3724 | Line 3789 | public class ConcurrentHashMapV8<K, V>
3789		* of all keys using the given reducer to combine values, and
3790		* the given basis as an identity value.
3791		*
3792	+	* @param parallelismThreshold the (estimated) number of elements
3793	+	* needed for this operation to be executed in parallel
3794		* @param transformer a function returning the transformation
3795		* for an element
3796		* @param basis the identity (initial default value) for the reduction
3797		* @param reducer a commutative associative combining function
3798		* @return the result of accumulating the given transformation
3799		* of all keys
3800	+	* @since 1.8
3801		*/
3802	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3802	>	public long reduceKeysToLong(long parallelismThreshold,
3803	>	ObjectToLong<? super K> transformer,
3804		long basis,
3805		LongByLongToLong reducer) {
3806	<	return ForkJoinTasks.reduceKeysToLong
3807	<	(this, transformer, basis, reducer).invoke();
3806	>	if (transformer == null || reducer == null)
3807	>	throw new NullPointerException();
3808	>	return new MapReduceKeysToLongTask<K,V>
3809	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3810	>	null, transformer, basis, reducer).invoke();
3811		}
3812
3813		/**
#	Line 3743 | Line 3815 | public class ConcurrentHashMapV8<K, V>
3815		* of all keys using the given reducer to combine values, and
3816		* the given basis as an identity value.
3817		*
3818	+	* @param parallelismThreshold the (estimated) number of elements
3819	+	* needed for this operation to be executed in parallel
3820		* @param transformer a function returning the transformation
3821		* for an element
3822		* @param basis the identity (initial default value) for the reduction
3823		* @param reducer a commutative associative combining function
3824		* @return the result of accumulating the given transformation
3825		* of all keys
3826	+	* @since 1.8
3827		*/
3828	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3828	>	public int reduceKeysToInt(long parallelismThreshold,
3829	>	ObjectToInt<? super K> transformer,
3830		int basis,
3831		IntByIntToInt reducer) {
3832	<	return ForkJoinTasks.reduceKeysToInt
3833	<	(this, transformer, basis, reducer).invoke();
3832	>	if (transformer == null || reducer == null)
3833	>	throw new NullPointerException();
3834	>	return new MapReduceKeysToIntTask<K,V>
3835	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3836	>	null, transformer, basis, reducer).invoke();
3837		}
3838
3839		/**
3840		* Performs the given action for each value.
3841		*
3842	+	* @param parallelismThreshold the (estimated) number of elements
3843	+	* needed for this operation to be executed in parallel
3844		* @param action the action
3845	+	* @since 1.8
3846		*/
3847	<	public void forEachValue(Action<V> action) {
3848	<	ForkJoinTasks.forEachValue
3849	<	(this, action).invoke();
3847	>	public void forEachValue(long parallelismThreshold,
3848	>	Action<? super V> action) {
3849	>	if (action == null)
3850	>	throw new NullPointerException();
3851	>	new ForEachValueTask<K,V>
3852	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3853	>	action).invoke();
3854		}
3855
3856		/**
3857		* Performs the given action for each non-null transformation
3858		* of each value.
3859		*
3860	+	* @param parallelismThreshold the (estimated) number of elements
3861	+	* needed for this operation to be executed in parallel
3862		* @param transformer a function returning the transformation
3863	<	* for an element, or null of there is no transformation (in
3864	<	* which case the action is not applied).
3863	>	* for an element, or null if there is no transformation (in
3864	>	* which case the action is not applied)
3865	>	* @param action the action
3866	>	* @since 1.8
3867		*/
3868	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3869	<	Action<U> action) {
3870	<	ForkJoinTasks.forEachValue
3871	<	(this, transformer, action).invoke();
3868	>	public <U> void forEachValue(long parallelismThreshold,
3869	>	Fun<? super V, ? extends U> transformer,
3870	>	Action<? super U> action) {
3871	>	if (transformer == null || action == null)
3872	>	throw new NullPointerException();
3873	>	new ForEachTransformedValueTask<K,V,U>
3874	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3875	>	transformer, action).invoke();
3876		}
3877
3878		/**
#	Line 3788 | Line 3882 | public class ConcurrentHashMapV8<K, V>
3882		* any other parallel invocations of the search function are
3883		* ignored.
3884		*
3885	+	* @param parallelismThreshold the (estimated) number of elements
3886	+	* needed for this operation to be executed in parallel
3887		* @param searchFunction a function returning a non-null
3888		* result on success, else null
3889		* @return a non-null result from applying the given search
3890		* function on each value, or null if none
3891	<	*
3891	>	* @since 1.8
3892		*/
3893	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3894	<	return ForkJoinTasks.searchValues
3895	<	(this, searchFunction).invoke();
3893	>	public <U> U searchValues(long parallelismThreshold,
3894	>	Fun<? super V, ? extends U> searchFunction) {
3895	>	if (searchFunction == null) throw new NullPointerException();
3896	>	return new SearchValuesTask<K,V,U>
3897	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3898	>	searchFunction, new AtomicReference<U>()).invoke();
3899		}
3900
3901		/**
3902		* Returns the result of accumulating all values using the
3903		* given reducer to combine values, or null if none.
3904		*
3905	+	* @param parallelismThreshold the (estimated) number of elements
3906	+	* needed for this operation to be executed in parallel
3907		* @param reducer a commutative associative combining function
3908	<	* @return  the result of accumulating all values
3908	>	* @return the result of accumulating all values
3909	>	* @since 1.8
3910		*/
3911	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3912	<	return ForkJoinTasks.reduceValues
3913	<	(this, reducer).invoke();
3911	>	public V reduceValues(long parallelismThreshold,
3912	>	BiFun<? super V, ? super V, ? extends V> reducer) {
3913	>	if (reducer == null) throw new NullPointerException();
3914	>	return new ReduceValuesTask<K,V>
3915	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3916	>	null, reducer).invoke();
3917		}
3918
3919		/**
#	Line 3816 | Line 3921 | public class ConcurrentHashMapV8<K, V>
3921		* of all values using the given reducer to combine values, or
3922		* null if none.
3923		*
3924	+	* @param parallelismThreshold the (estimated) number of elements
3925	+	* needed for this operation to be executed in parallel
3926		* @param transformer a function returning the transformation
3927	<	* for an element, or null of there is no transformation (in
3928	<	* which case it is not combined).
3927	>	* for an element, or null if there is no transformation (in
3928	>	* which case it is not combined)
3929		* @param reducer a commutative associative combining function
3930		* @return the result of accumulating the given transformation
3931		* of all values
3932	+	* @since 1.8
3933		*/
3934	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3934	>	public <U> U reduceValues(long parallelismThreshold,
3935	>	Fun<? super V, ? extends U> transformer,
3936		BiFun<? super U, ? super U, ? extends U> reducer) {
3937	<	return ForkJoinTasks.reduceValues
3938	<	(this, transformer, reducer).invoke();
3937	>	if (transformer == null || reducer == null)
3938	>	throw new NullPointerException();
3939	>	return new MapReduceValuesTask<K,V,U>
3940	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3941	>	null, transformer, reducer).invoke();
3942		}
3943
3944		/**
#	Line 3834 | Line 3946 | public class ConcurrentHashMapV8<K, V>
3946		* of all values using the given reducer to combine values,
3947		* and the given basis as an identity value.
3948		*
3949	+	* @param parallelismThreshold the (estimated) number of elements
3950	+	* needed for this operation to be executed in parallel
3951		* @param transformer a function returning the transformation
3952		* for an element
3953		* @param basis the identity (initial default value) for the reduction
3954		* @param reducer a commutative associative combining function
3955		* @return the result of accumulating the given transformation
3956		* of all values
3957	+	* @since 1.8
3958		*/
3959	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
3959	>	public double reduceValuesToDouble(long parallelismThreshold,
3960	>	ObjectToDouble<? super V> transformer,
3961		double basis,
3962		DoubleByDoubleToDouble reducer) {
3963	<	return ForkJoinTasks.reduceValuesToDouble
3964	<	(this, transformer, basis, reducer).invoke();
3963	>	if (transformer == null || reducer == null)
3964	>	throw new NullPointerException();
3965	>	return new MapReduceValuesToDoubleTask<K,V>
3966	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3967	>	null, transformer, basis, reducer).invoke();
3968		}
3969
3970		/**
#	Line 3853 | Line 3972 | public class ConcurrentHashMapV8<K, V>
3972		* of all values using the given reducer to combine values,
3973		* and the given basis as an identity value.
3974		*
3975	+	* @param parallelismThreshold the (estimated) number of elements
3976	+	* needed for this operation to be executed in parallel
3977		* @param transformer a function returning the transformation
3978		* for an element
3979		* @param basis the identity (initial default value) for the reduction
3980		* @param reducer a commutative associative combining function
3981		* @return the result of accumulating the given transformation
3982		* of all values
3983	+	* @since 1.8
3984		*/
3985	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
3985	>	public long reduceValuesToLong(long parallelismThreshold,
3986	>	ObjectToLong<? super V> transformer,
3987		long basis,
3988		LongByLongToLong reducer) {
3989	<	return ForkJoinTasks.reduceValuesToLong
3990	<	(this, transformer, basis, reducer).invoke();
3989	>	if (transformer == null || reducer == null)
3990	>	throw new NullPointerException();
3991	>	return new MapReduceValuesToLongTask<K,V>
3992	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3993	>	null, transformer, basis, reducer).invoke();
3994		}
3995
3996		/**
#	Line 3872 | Line 3998 | public class ConcurrentHashMapV8<K, V>
3998		* of all values using the given reducer to combine values,
3999		* and the given basis as an identity value.
4000		*
4001	+	* @param parallelismThreshold the (estimated) number of elements
4002	+	* needed for this operation to be executed in parallel
4003		* @param transformer a function returning the transformation
4004		* for an element
4005		* @param basis the identity (initial default value) for the reduction
4006		* @param reducer a commutative associative combining function
4007		* @return the result of accumulating the given transformation
4008		* of all values
4009	+	* @since 1.8
4010		*/
4011	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
4011	>	public int reduceValuesToInt(long parallelismThreshold,
4012	>	ObjectToInt<? super V> transformer,
4013		int basis,
4014		IntByIntToInt reducer) {
4015	<	return ForkJoinTasks.reduceValuesToInt
4016	<	(this, transformer, basis, reducer).invoke();
4015	>	if (transformer == null || reducer == null)
4016	>	throw new NullPointerException();
4017	>	return new MapReduceValuesToIntTask<K,V>
4018	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4019	>	null, transformer, basis, reducer).invoke();
4020		}
4021
4022		/**
4023		* Performs the given action for each entry.
4024		*
4025	+	* @param parallelismThreshold the (estimated) number of elements
4026	+	* needed for this operation to be executed in parallel
4027		* @param action the action
4028	+	* @since 1.8
4029		*/
4030	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
4031	<	ForkJoinTasks.forEachEntry
4032	<	(this, action).invoke();
4030	>	public void forEachEntry(long parallelismThreshold,
4031	>	Action<? super Map.Entry<K,V>> action) {
4032	>	if (action == null) throw new NullPointerException();
4033	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
4034	>	action).invoke();
4035		}
4036
4037		/**
4038		* Performs the given action for each non-null transformation
4039		* of each entry.
4040		*
4041	+	* @param parallelismThreshold the (estimated) number of elements
4042	+	* needed for this operation to be executed in parallel
4043		* @param transformer a function returning the transformation
4044	<	* for an element, or null of there is no transformation (in
4045	<	* which case the action is not applied).
4044	>	* for an element, or null if there is no transformation (in
4045	>	* which case the action is not applied)
4046		* @param action the action
4047	+	* @since 1.8
4048		*/
4049	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
4050	<	Action<U> action) {
4051	<	ForkJoinTasks.forEachEntry
4052	<	(this, transformer, action).invoke();
4049	>	public <U> void forEachEntry(long parallelismThreshold,
4050	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4051	>	Action<? super U> action) {
4052	>	if (transformer == null || action == null)
4053	>	throw new NullPointerException();
4054	>	new ForEachTransformedEntryTask<K,V,U>
4055	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4056	>	transformer, action).invoke();
4057		}
4058
4059		/**
#	Line 3918 | Line 4063 | public class ConcurrentHashMapV8<K, V>
4063		* any other parallel invocations of the search function are
4064		* ignored.
4065		*
4066	+	* @param parallelismThreshold the (estimated) number of elements
4067	+	* needed for this operation to be executed in parallel
4068		* @param searchFunction a function returning a non-null
4069		* result on success, else null
4070		* @return a non-null result from applying the given search
4071		* function on each entry, or null if none
4072	+	* @since 1.8
4073		*/
4074	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4075	<	return ForkJoinTasks.searchEntries
4076	<	(this, searchFunction).invoke();
4074	>	public <U> U searchEntries(long parallelismThreshold,
4075	>	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4076	>	if (searchFunction == null) throw new NullPointerException();
4077	>	return new SearchEntriesTask<K,V,U>
4078	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4079	>	searchFunction, new AtomicReference<U>()).invoke();
4080		}
4081
4082		/**
4083		* Returns the result of accumulating all entries using the
4084		* given reducer to combine values, or null if none.
4085		*
4086	+	* @param parallelismThreshold the (estimated) number of elements
4087	+	* needed for this operation to be executed in parallel
4088		* @param reducer a commutative associative combining function
4089		* @return the result of accumulating all entries
4090	+	* @since 1.8
4091		*/
4092	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4093	<	return ForkJoinTasks.reduceEntries
4094	<	(this, reducer).invoke();
4092	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4093	>	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4094	>	if (reducer == null) throw new NullPointerException();
4095	>	return new ReduceEntriesTask<K,V>
4096	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4097	>	null, reducer).invoke();
4098		}
4099
4100		/**
#	Line 3945 | Line 4102 | public class ConcurrentHashMapV8<K, V>
4102		* of all entries using the given reducer to combine values,
4103		* or null if none.
4104		*
4105	+	* @param parallelismThreshold the (estimated) number of elements
4106	+	* needed for this operation to be executed in parallel
4107		* @param transformer a function returning the transformation
4108	<	* for an element, or null of there is no transformation (in
4109	<	* which case it is not combined).
4108	>	* for an element, or null if there is no transformation (in
4109	>	* which case it is not combined)
4110		* @param reducer a commutative associative combining function
4111		* @return the result of accumulating the given transformation
4112		* of all entries
4113	+	* @since 1.8
4114		*/
4115	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4115	>	public <U> U reduceEntries(long parallelismThreshold,
4116	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4117		BiFun<? super U, ? super U, ? extends U> reducer) {
4118	<	return ForkJoinTasks.reduceEntries
4119	<	(this, transformer, reducer).invoke();
4118	>	if (transformer == null || reducer == null)
4119	>	throw new NullPointerException();
4120	>	return new MapReduceEntriesTask<K,V,U>
4121	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4122	>	null, transformer, reducer).invoke();
4123		}
4124
4125		/**
#	Line 3963 | Line 4127 | public class ConcurrentHashMapV8<K, V>
4127		* of all entries using the given reducer to combine values,
4128		* and the given basis as an identity value.
4129		*
4130	+	* @param parallelismThreshold the (estimated) number of elements
4131	+	* needed for this operation to be executed in parallel
4132		* @param transformer a function returning the transformation
4133		* for an element
4134		* @param basis the identity (initial default value) for the reduction
4135		* @param reducer a commutative associative combining function
4136		* @return the result of accumulating the given transformation
4137		* of all entries
4138	+	* @since 1.8
4139		*/
4140	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4140	>	public double reduceEntriesToDouble(long parallelismThreshold,
4141	>	ObjectToDouble<Map.Entry<K,V>> transformer,
4142		double basis,
4143		DoubleByDoubleToDouble reducer) {
4144	<	return ForkJoinTasks.reduceEntriesToDouble
4145	<	(this, transformer, basis, reducer).invoke();
4144	>	if (transformer == null || reducer == null)
4145	>	throw new NullPointerException();
4146	>	return new MapReduceEntriesToDoubleTask<K,V>
4147	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4148	>	null, transformer, basis, reducer).invoke();
4149		}
4150
4151		/**
#	Line 3982 | Line 4153 | public class ConcurrentHashMapV8<K, V>
4153		* of all entries using the given reducer to combine values,
4154		* and the given basis as an identity value.
4155		*
4156	+	* @param parallelismThreshold the (estimated) number of elements
4157	+	* needed for this operation to be executed in parallel
4158		* @param transformer a function returning the transformation
4159		* for an element
4160		* @param basis the identity (initial default value) for the reduction
4161		* @param reducer a commutative associative combining function
4162	<	* @return  the result of accumulating the given transformation
4162	>	* @return the result of accumulating the given transformation
4163		* of all entries
4164	+	* @since 1.8
4165		*/
4166	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4166	>	public long reduceEntriesToLong(long parallelismThreshold,
4167	>	ObjectToLong<Map.Entry<K,V>> transformer,
4168		long basis,
4169		LongByLongToLong reducer) {
4170	<	return ForkJoinTasks.reduceEntriesToLong
4171	<	(this, transformer, basis, reducer).invoke();
4170	>	if (transformer == null || reducer == null)
4171	>	throw new NullPointerException();
4172	>	return new MapReduceEntriesToLongTask<K,V>
4173	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4174	>	null, transformer, basis, reducer).invoke();
4175		}
4176
4177		/**
#	Line 4001 | Line 4179 | public class ConcurrentHashMapV8<K, V>
4179		* of all entries using the given reducer to combine values,
4180		* and the given basis as an identity value.
4181		*
4182	+	* @param parallelismThreshold the (estimated) number of elements
4183	+	* needed for this operation to be executed in parallel
4184		* @param transformer a function returning the transformation
4185		* for an element
4186		* @param basis the identity (initial default value) for the reduction
4187		* @param reducer a commutative associative combining function
4188		* @return the result of accumulating the given transformation
4189		* of all entries
4190	+	* @since 1.8
4191		*/
4192	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4192	>	public int reduceEntriesToInt(long parallelismThreshold,
4193	>	ObjectToInt<Map.Entry<K,V>> transformer,
4194		int basis,
4195		IntByIntToInt reducer) {
4196	<	return ForkJoinTasks.reduceEntriesToInt
4197	<	(this, transformer, basis, reducer).invoke();
4196	>	if (transformer == null || reducer == null)
4197	>	throw new NullPointerException();
4198	>	return new MapReduceEntriesToIntTask<K,V>
4199	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4200	>	null, transformer, basis, reducer).invoke();
4201		}
4202
4203	+
4204		/* ----------------Views -------------- */
4205
4206		/**
4207		* Base class for views.
4208		*/
4209	<	static abstract class CHMView<K, V> {
4210	<	final ConcurrentHashMapV8<K, V> map;
4211	<	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
4209	>	abstract static class CollectionView<K,V,E>
4210	>	implements Collection<E>, java.io.Serializable {
4211	>	private static final long serialVersionUID = 7249069246763182397L;
4212	>	final ConcurrentHashMapV8<K,V> map;
4213	>	CollectionView(ConcurrentHashMapV8<K,V> map)  { this.map = map; }
4214
4215		/**
4216		* Returns the map backing this view.
#	Line 4031 | Line 4219 | public class ConcurrentHashMapV8<K, V>
4219		*/
4220		public ConcurrentHashMapV8<K,V> getMap() { return map; }
4221
4222	<	public final int size()                 { return map.size(); }
4223	<	public final boolean isEmpty()          { return map.isEmpty(); }
4224	<	public final void clear()               { map.clear(); }
4222	>	/**
4223	>	* Removes all of the elements from this view, by removing all
4224	>	* the mappings from the map backing this view.
4225	>	*/
4226	>	public final void clear()      { map.clear(); }
4227	>	public final int size()        { return map.size(); }
4228	>	public final boolean isEmpty() { return map.isEmpty(); }
4229
4230		// implementations below rely on concrete classes supplying these
4231	<	abstract public Iterator<?> iterator();
4232	<	abstract public boolean contains(Object o);
4233	<	abstract public boolean remove(Object o);
4231	>	// abstract methods
4232	>	/**
4233	>	* Returns a "weakly consistent" iterator that will never
4234	>	* throw {@link ConcurrentModificationException}, and
4235	>	* guarantees to traverse elements as they existed upon
4236	>	* construction of the iterator, and may (but is not
4237	>	* guaranteed to) reflect any modifications subsequent to
4238	>	* construction.
4239	>	*/
4240	>	public abstract Iterator<E> iterator();
4241	>	public abstract boolean contains(Object o);
4242	>	public abstract boolean remove(Object o);
4243
4244		private static final String oomeMsg = "Required array size too large";
4245
4246		public final Object[] toArray() {
4247		long sz = map.mappingCount();
4248	<	if (sz > (long)(MAX_ARRAY_SIZE))
4248	>	if (sz > MAX_ARRAY_SIZE)
4249		throw new OutOfMemoryError(oomeMsg);
4250		int n = (int)sz;
4251		Object[] r = new Object[n];
4252		int i = 0;
4253	<	Iterator<?> it = iterator();
4053	<	while (it.hasNext()) {
4253	>	for (E e : this) {
4254		if (i == n) {
4255		if (n >= MAX_ARRAY_SIZE)
4256		throw new OutOfMemoryError(oomeMsg);
#	Line 4060 | Line 4260 | public class ConcurrentHashMapV8<K, V>
4260		n += (n >>> 1) + 1;
4261		r = Arrays.copyOf(r, n);
4262		}
4263	<	r[i++] = it.next();
4263	>	r[i++] = e;
4264		}
4265		return (i == n) ? r : Arrays.copyOf(r, i);
4266		}
4267
4268	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4268	>	@SuppressWarnings("unchecked")
4269	>	public final <T> T[] toArray(T[] a) {
4270		long sz = map.mappingCount();
4271	<	if (sz > (long)(MAX_ARRAY_SIZE))
4271	>	if (sz > MAX_ARRAY_SIZE)
4272		throw new OutOfMemoryError(oomeMsg);
4273		int m = (int)sz;
4274		T[] r = (a.length >= m) ? a :
#	Line 4075 | Line 4276 | public class ConcurrentHashMapV8<K, V>
4276		.newInstance(a.getClass().getComponentType(), m);
4277		int n = r.length;
4278		int i = 0;
4279	<	Iterator<?> it = iterator();
4079	<	while (it.hasNext()) {
4279	>	for (E e : this) {
4280		if (i == n) {
4281		if (n >= MAX_ARRAY_SIZE)
4282		throw new OutOfMemoryError(oomeMsg);
#	Line 4086 | Line 4286 | public class ConcurrentHashMapV8<K, V>
4286		n += (n >>> 1) + 1;
4287		r = Arrays.copyOf(r, n);
4288		}
4289	<	r[i++] = (T)it.next();
4289	>	r[i++] = (T)e;
4290		}
4291		if (a == r && i < n) {
4292		r[i] = null; // null-terminate
#	Line 4095 | Line 4295 | public class ConcurrentHashMapV8<K, V>
4295		return (i == n) ? r : Arrays.copyOf(r, i);
4296		}
4297
4298	<	public final int hashCode() {
4299	<	int h = 0;
4300	<	for (Iterator<?> it = iterator(); it.hasNext();)
4301	<	h += it.next().hashCode();
4302	<	return h;
4303	<	}
4304	<
4298	>	/**
4299	>	* Returns a string representation of this collection.
4300	>	* The string representation consists of the string representations
4301	>	* of the collection's elements in the order they are returned by
4302	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4303	>	* Adjacent elements are separated by the characters {@code ", "}
4304	>	* (comma and space).  Elements are converted to strings as by
4305	>	* {@link String#valueOf(Object)}.
4306	>	*
4307	>	* @return a string representation of this collection
4308	>	*/
4309		public final String toString() {
4310		StringBuilder sb = new StringBuilder();
4311		sb.append('[');
4312	<	Iterator<?> it = iterator();
4312	>	Iterator<E> it = iterator();
4313		if (it.hasNext()) {
4314		for (;;) {
4315		Object e = it.next();
#	Line 4120 | Line 4324 | public class ConcurrentHashMapV8<K, V>
4324
4325		public final boolean containsAll(Collection<?> c) {
4326		if (c != this) {
4327	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
4124	<	Object e = it.next();
4327	>	for (Object e : c) {
4328		if (e == null || !contains(e))
4329		return false;
4330		}
#	Line 4131 | Line 4334 | public class ConcurrentHashMapV8<K, V>
4334
4335		public final boolean removeAll(Collection<?> c) {
4336		boolean modified = false;
4337	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4337	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4338		if (c.contains(it.next())) {
4339		it.remove();
4340		modified = true;
#	Line 4142 | Line 4345 | public class ConcurrentHashMapV8<K, V>
4345
4346		public final boolean retainAll(Collection<?> c) {
4347		boolean modified = false;
4348	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4348	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4349		if (!c.contains(it.next())) {
4350		it.remove();
4351		modified = true;
#	Line 4156 | Line 4359 | public class ConcurrentHashMapV8<K, V>
4359		/**
4360		* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4361		* which additions may optionally be enabled by mapping to a
4362	<	* common value.  This class cannot be directly instantiated. See
4363	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4364	<	* {@link #newKeySet(int)}.
4362	>	* common value.  This class cannot be directly instantiated.
4363	>	* See {@link #keySet() keySet()},
4364	>	* {@link #keySet(Object) keySet(V)},
4365	>	* {@link #newKeySet() newKeySet()},
4366	>	* {@link #newKeySet(int) newKeySet(int)}.
4367	>	*
4368	>	* @since 1.8
4369		*/
4370	<	public static class KeySetView<K,V> extends CHMView<K,V> implements Set<K>, java.io.Serializable {
4370	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4371	>	implements Set<K>, java.io.Serializable {
4372		private static final long serialVersionUID = 7249069246763182397L;
4373		private final V value;
4374	<	KeySetView(ConcurrentHashMapV8<K, V> map, V value) {  // non-public
4374	>	KeySetView(ConcurrentHashMapV8<K,V> map, V value) {  // non-public
4375		super(map);
4376		this.value = value;
4377		}
#	Line 4173 | Line 4381 | public class ConcurrentHashMapV8<K, V>
4381		* or {@code null} if additions are not supported.
4382		*
4383		* @return the default mapped value for additions, or {@code null}
4384	<	* if not supported.
4384	>	* if not supported
4385		*/
4386		public V getMappedValue() { return value; }
4387
4388	<	// implement Set API
4389	<
4388	>	/**
4389	>	* {@inheritDoc}
4390	>	* @throws NullPointerException if the specified key is null
4391	>	*/
4392		public boolean contains(Object o) { return map.containsKey(o); }
4183	–	public boolean remove(Object o)   { return map.remove(o) != null; }
4393
4394		/**
4395	<	* Returns a "weakly consistent" iterator that will never
4396	<	* throw {@link ConcurrentModificationException}, and
4397	<	* guarantees to traverse elements as they existed upon
4189	<	* construction of the iterator, and may (but is not
4190	<	* guaranteed to) reflect any modifications subsequent to
4191	<	* construction.
4395	>	* Removes the key from this map view, by removing the key (and its
4396	>	* corresponding value) from the backing map.  This method does
4397	>	* nothing if the key is not in the map.
4398		*
4399	<	* @return an iterator over the keys of this map
4399	>	* @param  o the key to be removed from the backing map
4400	>	* @return {@code true} if the backing map contained the specified key
4401	>	* @throws NullPointerException if the specified key is null
4402	>	*/
4403	>	public boolean remove(Object o) { return map.remove(o) != null; }
4404	>
4405	>	/**
4406	>	* @return an iterator over the keys of the backing map
4407	>	*/
4408	>	public Iterator<K> iterator() {
4409	>	Node<K,V>[] t;
4410	>	ConcurrentHashMapV8<K,V> m = map;
4411	>	int f = (t = m.table) == null ? 0 : t.length;
4412	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4413	>	}
4414	>
4415	>	/**
4416	>	* Adds the specified key to this set view by mapping the key to
4417	>	* the default mapped value in the backing map, if defined.
4418	>	*
4419	>	* @param e key to be added
4420	>	* @return {@code true} if this set changed as a result of the call
4421	>	* @throws NullPointerException if the specified key is null
4422	>	* @throws UnsupportedOperationException if no default mapped value
4423	>	* for additions was provided
4424		*/
4195	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4425		public boolean add(K e) {
4426		V v;
4427		if ((v = value) == null)
4428		throw new UnsupportedOperationException();
4429	<	if (e == null)
4201	<	throw new NullPointerException();
4202	<	return map.internalPutIfAbsent(e, v) == null;
4429	>	return map.putVal(e, v, true) == null;
4430		}
4431	+
4432	+	/**
4433	+	* Adds all of the elements in the specified collection to this set,
4434	+	* as if by calling {@link #add} on each one.
4435	+	*
4436	+	* @param c the elements to be inserted into this set
4437	+	* @return {@code true} if this set changed as a result of the call
4438	+	* @throws NullPointerException if the collection or any of its
4439	+	* elements are {@code null}
4440	+	* @throws UnsupportedOperationException if no default mapped value
4441	+	* for additions was provided
4442	+	*/
4443		public boolean addAll(Collection<? extends K> c) {
4444		boolean added = false;
4445		V v;
4446		if ((v = value) == null)
4447		throw new UnsupportedOperationException();
4448		for (K e : c) {
4449	<	if (e == null)
4211	<	throw new NullPointerException();
4212	<	if (map.internalPutIfAbsent(e, v) == null)
4449	>	if (map.putVal(e, v, true) == null)
4450		added = true;
4451		}
4452		return added;
4453		}
4454	+
4455	+	public int hashCode() {
4456	+	int h = 0;
4457	+	for (K e : this)
4458	+	h += e.hashCode();
4459	+	return h;
4460	+	}
4461	+
4462		public boolean equals(Object o) {
4463		Set<?> c;
4464		return ((o instanceof Set) &&
#	Line 4221 | Line 4466 | public class ConcurrentHashMapV8<K, V>
4466		(containsAll(c) && c.containsAll(this))));
4467		}
4468
4469	<	/**
4470	<	* Performs the given action for each key.
4471	<	*
4472	<	* @param action the action
4473	<	*/
4474	<	public void forEach(Action<K> action) {
4230	<	ForkJoinTasks.forEachKey
4231	<	(map, action).invoke();
4232	<	}
4233	<
4234	<	/**
4235	<	* Performs the given action for each non-null transformation
4236	<	* of each key.
4237	<	*
4238	<	* @param transformer a function returning the transformation
4239	<	* for an element, or null of there is no transformation (in
4240	<	* which case the action is not applied).
4241	<	* @param action the action
4242	<	*/
4243	<	public <U> void forEach(Fun<? super K, ? extends U> transformer,
4244	<	Action<U> action) {
4245	<	ForkJoinTasks.forEachKey
4246	<	(map, transformer, action).invoke();
4247	<	}
4248	<
4249	<	/**
4250	<	* Returns a non-null result from applying the given search
4251	<	* function on each key, or null if none. Upon success,
4252	<	* further element processing is suppressed and the results of
4253	<	* any other parallel invocations of the search function are
4254	<	* ignored.
4255	<	*
4256	<	* @param searchFunction a function returning a non-null
4257	<	* result on success, else null
4258	<	* @return a non-null result from applying the given search
4259	<	* function on each key, or null if none
4260	<	*/
4261	<	public <U> U search(Fun<? super K, ? extends U> searchFunction) {
4262	<	return ForkJoinTasks.searchKeys
4263	<	(map, searchFunction).invoke();
4264	<	}
4265	<
4266	<	/**
4267	<	* Returns the result of accumulating all keys using the given
4268	<	* reducer to combine values, or null if none.
4269	<	*
4270	<	* @param reducer a commutative associative combining function
4271	<	* @return the result of accumulating all keys using the given
4272	<	* reducer to combine values, or null if none
4273	<	*/
4274	<	public K reduce(BiFun<? super K, ? super K, ? extends K> reducer) {
4275	<	return ForkJoinTasks.reduceKeys
4276	<	(map, reducer).invoke();
4277	<	}
4278	<
4279	<	/**
4280	<	* Returns the result of accumulating the given transformation
4281	<	* of all keys using the given reducer to combine values, and
4282	<	* the given basis as an identity value.
4283	<	*
4284	<	* @param transformer a function returning the transformation
4285	<	* for an element
4286	<	* @param basis the identity (initial default value) for the reduction
4287	<	* @param reducer a commutative associative combining function
4288	<	* @return  the result of accumulating the given transformation
4289	<	* of all keys
4290	<	*/
4291	<	public double reduceToDouble(ObjectToDouble<? super K> transformer,
4292	<	double basis,
4293	<	DoubleByDoubleToDouble reducer) {
4294	<	return ForkJoinTasks.reduceKeysToDouble
4295	<	(map, transformer, basis, reducer).invoke();
4296	<	}
4297	<
4298	<
4299	<	/**
4300	<	* Returns the result of accumulating the given transformation
4301	<	* of all keys using the given reducer to combine values, and
4302	<	* the given basis as an identity value.
4303	<	*
4304	<	* @param transformer a function returning the transformation
4305	<	* for an element
4306	<	* @param basis the identity (initial default value) for the reduction
4307	<	* @param reducer a commutative associative combining function
4308	<	* @return the result of accumulating the given transformation
4309	<	* of all keys
4310	<	*/
4311	<	public long reduceToLong(ObjectToLong<? super K> transformer,
4312	<	long basis,
4313	<	LongByLongToLong reducer) {
4314	<	return ForkJoinTasks.reduceKeysToLong
4315	<	(map, transformer, basis, reducer).invoke();
4469	>	public ConcurrentHashMapSpliterator<K> spliterator() {
4470	>	Node<K,V>[] t;
4471	>	ConcurrentHashMapV8<K,V> m = map;
4472	>	long n = m.sumCount();
4473	>	int f = (t = m.table) == null ? 0 : t.length;
4474	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4475		}
4476
4477	<	/**
4478	<	* Returns the result of accumulating the given transformation
4479	<	* of all keys using the given reducer to combine values, and
4480	<	* the given basis as an identity value.
4481	<	*
4482	<	* @param transformer a function returning the transformation
4483	<	* for an element
4484	<	* @param basis the identity (initial default value) for the reduction
4326	<	* @param reducer a commutative associative combining function
4327	<	* @return the result of accumulating the given transformation
4328	<	* of all keys
4329	<	*/
4330	<	public int reduceToInt(ObjectToInt<? super K> transformer,
4331	<	int basis,
4332	<	IntByIntToInt reducer) {
4333	<	return ForkJoinTasks.reduceKeysToInt
4334	<	(map, transformer, basis, reducer).invoke();
4477	>	public void forEach(Action<? super K> action) {
4478	>	if (action == null) throw new NullPointerException();
4479	>	Node<K,V>[] t;
4480	>	if ((t = map.table) != null) {
4481	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4482	>	for (Node<K,V> p; (p = it.advance()) != null; )
4483	>	action.apply(p.key);
4484	>	}
4485		}
4336	–
4486		}
4487
4488		/**
4489		* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4490		* values, in which additions are disabled. This class cannot be
4491	<	* directly instantiated. See {@link #values},
4343	<	*
4344	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4345	<	* that will never throw {@link ConcurrentModificationException},
4346	<	* and guarantees to traverse elements as they existed upon
4347	<	* construction of the iterator, and may (but is not guaranteed to)
4348	<	* reflect any modifications subsequent to construction.
4491	>	* directly instantiated. See {@link #values()}.
4492		*/
4493	<	public static final class ValuesView<K,V> extends CHMView<K,V>
4494	<	implements Collection<V> {
4495	<	ValuesView(ConcurrentHashMapV8<K, V> map)   { super(map); }
4496	<	public final boolean contains(Object o) { return map.containsValue(o); }
4493	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4494	>	implements Collection<V>, java.io.Serializable {
4495	>	private static final long serialVersionUID = 2249069246763182397L;
4496	>	ValuesView(ConcurrentHashMapV8<K,V> map) { super(map); }
4497	>	public final boolean contains(Object o) {
4498	>	return map.containsValue(o);
4499	>	}
4500	>
4501		public final boolean remove(Object o) {
4502		if (o != null) {
4503	<	Iterator<V> it = new ValueIterator<K,V>(map);
4357	<	while (it.hasNext()) {
4503	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4504		if (o.equals(it.next())) {
4505		it.remove();
4506		return true;
#	Line 4364 | Line 4510 | public class ConcurrentHashMapV8<K, V>
4510		return false;
4511		}
4512
4367	–	/**
4368	–	* Returns a "weakly consistent" iterator that will never
4369	–	* throw {@link ConcurrentModificationException}, and
4370	–	* guarantees to traverse elements as they existed upon
4371	–	* construction of the iterator, and may (but is not
4372	–	* guaranteed to) reflect any modifications subsequent to
4373	–	* construction.
4374	–	*
4375	–	* @return an iterator over the values of this map
4376	–	*/
4513		public final Iterator<V> iterator() {
4514	<	return new ValueIterator<K,V>(map);
4514	>	ConcurrentHashMapV8<K,V> m = map;
4515	>	Node<K,V>[] t;
4516	>	int f = (t = m.table) == null ? 0 : t.length;
4517	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4518		}
4519	+
4520		public final boolean add(V e) {
4521		throw new UnsupportedOperationException();
4522		}
#	Line 4384 | Line 4524 | public class ConcurrentHashMapV8<K, V>
4524		throw new UnsupportedOperationException();
4525		}
4526
4527	<	/**
4528	<	* Performs the given action for each value.
4529	<	*
4530	<	* @param action the action
4531	<	*/
4532	<	public void forEach(Action<V> action) {
4393	<	ForkJoinTasks.forEachValue
4394	<	(map, action).invoke();
4395	<	}
4396	<
4397	<	/**
4398	<	* Performs the given action for each non-null transformation
4399	<	* of each value.
4400	<	*
4401	<	* @param transformer a function returning the transformation
4402	<	* for an element, or null of there is no transformation (in
4403	<	* which case the action is not applied).
4404	<	*/
4405	<	public <U> void forEach(Fun<? super V, ? extends U> transformer,
4406	<	Action<U> action) {
4407	<	ForkJoinTasks.forEachValue
4408	<	(map, transformer, action).invoke();
4527	>	public ConcurrentHashMapSpliterator<V> spliterator() {
4528	>	Node<K,V>[] t;
4529	>	ConcurrentHashMapV8<K,V> m = map;
4530	>	long n = m.sumCount();
4531	>	int f = (t = m.table) == null ? 0 : t.length;
4532	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4533		}
4534
4535	<	/**
4536	<	* Returns a non-null result from applying the given search
4537	<	* function on each value, or null if none.  Upon success,
4538	<	* further element processing is suppressed and the results of
4539	<	* any other parallel invocations of the search function are
4540	<	* ignored.
4541	<	*
4542	<	* @param searchFunction a function returning a non-null
4419	<	* result on success, else null
4420	<	* @return a non-null result from applying the given search
4421	<	* function on each value, or null if none
4422	<	*
4423	<	*/
4424	<	public <U> U search(Fun<? super V, ? extends U> searchFunction) {
4425	<	return ForkJoinTasks.searchValues
4426	<	(map, searchFunction).invoke();
4427	<	}
4428	<
4429	<	/**
4430	<	* Returns the result of accumulating all values using the
4431	<	* given reducer to combine values, or null if none.
4432	<	*
4433	<	* @param reducer a commutative associative combining function
4434	<	* @return  the result of accumulating all values
4435	<	*/
4436	<	public V reduce(BiFun<? super V, ? super V, ? extends V> reducer) {
4437	<	return ForkJoinTasks.reduceValues
4438	<	(map, reducer).invoke();
4439	<	}
4440	<
4441	<	/**
4442	<	* Returns the result of accumulating the given transformation
4443	<	* of all values using the given reducer to combine values, or
4444	<	* null if none.
4445	<	*
4446	<	* @param transformer a function returning the transformation
4447	<	* for an element, or null of there is no transformation (in
4448	<	* which case it is not combined).
4449	<	* @param reducer a commutative associative combining function
4450	<	* @return the result of accumulating the given transformation
4451	<	* of all values
4452	<	*/
4453	<	public <U> U reduce(Fun<? super V, ? extends U> transformer,
4454	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4455	<	return ForkJoinTasks.reduceValues
4456	<	(map, transformer, reducer).invoke();
4457	<	}
4458	<
4459	<	/**
4460	<	* Returns the result of accumulating the given transformation
4461	<	* of all values using the given reducer to combine values,
4462	<	* and the given basis as an identity value.
4463	<	*
4464	<	* @param transformer a function returning the transformation
4465	<	* for an element
4466	<	* @param basis the identity (initial default value) for the reduction
4467	<	* @param reducer a commutative associative combining function
4468	<	* @return the result of accumulating the given transformation
4469	<	* of all values
4470	<	*/
4471	<	public double reduceToDouble(ObjectToDouble<? super V> transformer,
4472	<	double basis,
4473	<	DoubleByDoubleToDouble reducer) {
4474	<	return ForkJoinTasks.reduceValuesToDouble
4475	<	(map, transformer, basis, reducer).invoke();
4476	<	}
4477	<
4478	<	/**
4479	<	* Returns the result of accumulating the given transformation
4480	<	* of all values using the given reducer to combine values,
4481	<	* and the given basis as an identity value.
4482	<	*
4483	<	* @param transformer a function returning the transformation
4484	<	* for an element
4485	<	* @param basis the identity (initial default value) for the reduction
4486	<	* @param reducer a commutative associative combining function
4487	<	* @return the result of accumulating the given transformation
4488	<	* of all values
4489	<	*/
4490	<	public long reduceToLong(ObjectToLong<? super V> transformer,
4491	<	long basis,
4492	<	LongByLongToLong reducer) {
4493	<	return ForkJoinTasks.reduceValuesToLong
4494	<	(map, transformer, basis, reducer).invoke();
4495	<	}
4496	<
4497	<	/**
4498	<	* Returns the result of accumulating the given transformation
4499	<	* of all values using the given reducer to combine values,
4500	<	* and the given basis as an identity value.
4501	<	*
4502	<	* @param transformer a function returning the transformation
4503	<	* for an element
4504	<	* @param basis the identity (initial default value) for the reduction
4505	<	* @param reducer a commutative associative combining function
4506	<	* @return the result of accumulating the given transformation
4507	<	* of all values
4508	<	*/
4509	<	public int reduceToInt(ObjectToInt<? super V> transformer,
4510	<	int basis,
4511	<	IntByIntToInt reducer) {
4512	<	return ForkJoinTasks.reduceValuesToInt
4513	<	(map, transformer, basis, reducer).invoke();
4535	>	public void forEach(Action<? super V> action) {
4536	>	if (action == null) throw new NullPointerException();
4537	>	Node<K,V>[] t;
4538	>	if ((t = map.table) != null) {
4539	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4540	>	for (Node<K,V> p; (p = it.advance()) != null; )
4541	>	action.apply(p.val);
4542	>	}
4543		}
4515	–
4544		}
4545
4546		/**
4547		* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4548		* entries.  This class cannot be directly instantiated. See
4549	<	* {@link #entrySet}.
4549	>	* {@link #entrySet()}.
4550		*/
4551	<	public static final class EntrySetView<K,V> extends CHMView<K,V>
4552	<	implements Set<Map.Entry<K,V>> {
4553	<	EntrySetView(ConcurrentHashMapV8<K, V> map) { super(map); }
4554	<	public final boolean contains(Object o) {
4551	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4552	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4553	>	private static final long serialVersionUID = 2249069246763182397L;
4554	>	EntrySetView(ConcurrentHashMapV8<K,V> map) { super(map); }
4555	>
4556	>	public boolean contains(Object o) {
4557		Object k, v, r; Map.Entry<?,?> e;
4558		return ((o instanceof Map.Entry) &&
4559		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4531 | Line 4561 | public class ConcurrentHashMapV8<K, V>
4561		(v = e.getValue()) != null &&
4562		(v == r || v.equals(r)));
4563		}
4564	<	public final boolean remove(Object o) {
4564	>
4565	>	public boolean remove(Object o) {
4566		Object k, v; Map.Entry<?,?> e;
4567		return ((o instanceof Map.Entry) &&
4568		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4540 | Line 4571 | public class ConcurrentHashMapV8<K, V>
4571		}
4572
4573		/**
4574	<	* Returns a "weakly consistent" iterator that will never
4544	<	* throw {@link ConcurrentModificationException}, and
4545	<	* guarantees to traverse elements as they existed upon
4546	<	* construction of the iterator, and may (but is not
4547	<	* guaranteed to) reflect any modifications subsequent to
4548	<	* construction.
4549	<	*
4550	<	* @return an iterator over the entries of this map
4574	>	* @return an iterator over the entries of the backing map
4575		*/
4576	<	public final Iterator<Map.Entry<K,V>> iterator() {
4577	<	return new EntryIterator<K,V>(map);
4576	>	public Iterator<Map.Entry<K,V>> iterator() {
4577	>	ConcurrentHashMapV8<K,V> m = map;
4578	>	Node<K,V>[] t;
4579	>	int f = (t = m.table) == null ? 0 : t.length;
4580	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4581		}
4582
4583	<	public final boolean add(Entry<K,V> e) {
4584	<	K key = e.getKey();
4558	<	V value = e.getValue();
4559	<	if (key == null || value == null)
4560	<	throw new NullPointerException();
4561	<	return map.internalPut(key, value) == null;
4583	>	public boolean add(Entry<K,V> e) {
4584	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4585		}
4586	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4586	>
4587	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4588		boolean added = false;
4589		for (Entry<K,V> e : c) {
4590		if (add(e))
#	Line 4568 | Line 4592 | public class ConcurrentHashMapV8<K, V>
4592		}
4593		return added;
4594		}
4595	<	public boolean equals(Object o) {
4595	>
4596	>	public final int hashCode() {
4597	>	int h = 0;
4598	>	Node<K,V>[] t;
4599	>	if ((t = map.table) != null) {
4600	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4601	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4602	>	h += p.hashCode();
4603	>	}
4604	>	}
4605	>	return h;
4606	>	}
4607	>
4608	>	public final boolean equals(Object o) {
4609		Set<?> c;
4610		return ((o instanceof Set) &&
4611		((c = (Set<?>)o) == this ||
4612		(containsAll(c) && c.containsAll(this))));
4613		}
4614
4615	<	/**
4616	<	* Performs the given action for each entry.
4617	<	*
4618	<	* @param action the action
4619	<	*/
4620	<	public void forEach(Action<Map.Entry<K,V>> action) {
4584	<	ForkJoinTasks.forEachEntry
4585	<	(map, action).invoke();
4586	<	}
4587	<
4588	<	/**
4589	<	* Performs the given action for each non-null transformation
4590	<	* of each entry.
4591	<	*
4592	<	* @param transformer a function returning the transformation
4593	<	* for an element, or null of there is no transformation (in
4594	<	* which case the action is not applied).
4595	<	* @param action the action
4596	<	*/
4597	<	public <U> void forEach(Fun<Map.Entry<K,V>, ? extends U> transformer,
4598	<	Action<U> action) {
4599	<	ForkJoinTasks.forEachEntry
4600	<	(map, transformer, action).invoke();
4601	<	}
4602	<
4603	<	/**
4604	<	* Returns a non-null result from applying the given search
4605	<	* function on each entry, or null if none.  Upon success,
4606	<	* further element processing is suppressed and the results of
4607	<	* any other parallel invocations of the search function are
4608	<	* ignored.
4609	<	*
4610	<	* @param searchFunction a function returning a non-null
4611	<	* result on success, else null
4612	<	* @return a non-null result from applying the given search
4613	<	* function on each entry, or null if none
4614	<	*/
4615	<	public <U> U search(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4616	<	return ForkJoinTasks.searchEntries
4617	<	(map, searchFunction).invoke();
4618	<	}
4619	<
4620	<	/**
4621	<	* Returns the result of accumulating all entries using the
4622	<	* given reducer to combine values, or null if none.
4623	<	*
4624	<	* @param reducer a commutative associative combining function
4625	<	* @return the result of accumulating all entries
4626	<	*/
4627	<	public Map.Entry<K,V> reduce(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4628	<	return ForkJoinTasks.reduceEntries
4629	<	(map, reducer).invoke();
4630	<	}
4631	<
4632	<	/**
4633	<	* Returns the result of accumulating the given transformation
4634	<	* of all entries using the given reducer to combine values,
4635	<	* or null if none.
4636	<	*
4637	<	* @param transformer a function returning the transformation
4638	<	* for an element, or null of there is no transformation (in
4639	<	* which case it is not combined).
4640	<	* @param reducer a commutative associative combining function
4641	<	* @return the result of accumulating the given transformation
4642	<	* of all entries
4643	<	*/
4644	<	public <U> U reduce(Fun<Map.Entry<K,V>, ? extends U> transformer,
4645	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4646	<	return ForkJoinTasks.reduceEntries
4647	<	(map, transformer, reducer).invoke();
4615	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> spliterator() {
4616	>	Node<K,V>[] t;
4617	>	ConcurrentHashMapV8<K,V> m = map;
4618	>	long n = m.sumCount();
4619	>	int f = (t = m.table) == null ? 0 : t.length;
4620	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4621		}
4622
4623	<	/**
4624	<	* Returns the result of accumulating the given transformation
4625	<	* of all entries using the given reducer to combine values,
4626	<	* and the given basis as an identity value.
4627	<	*
4628	<	* @param transformer a function returning the transformation
4629	<	* for an element
4630	<	* @param basis the identity (initial default value) for the reduction
4658	<	* @param reducer a commutative associative combining function
4659	<	* @return the result of accumulating the given transformation
4660	<	* of all entries
4661	<	*/
4662	<	public double reduceToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4663	<	double basis,
4664	<	DoubleByDoubleToDouble reducer) {
4665	<	return ForkJoinTasks.reduceEntriesToDouble
4666	<	(map, transformer, basis, reducer).invoke();
4667	<	}
4668	<
4669	<	/**
4670	<	* Returns the result of accumulating the given transformation
4671	<	* of all entries using the given reducer to combine values,
4672	<	* and the given basis as an identity value.
4673	<	*
4674	<	* @param transformer a function returning the transformation
4675	<	* for an element
4676	<	* @param basis the identity (initial default value) for the reduction
4677	<	* @param reducer a commutative associative combining function
4678	<	* @return  the result of accumulating the given transformation
4679	<	* of all entries
4680	<	*/
4681	<	public long reduceToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4682	<	long basis,
4683	<	LongByLongToLong reducer) {
4684	<	return ForkJoinTasks.reduceEntriesToLong
4685	<	(map, transformer, basis, reducer).invoke();
4686	<	}
4687	<
4688	<	/**
4689	<	* Returns the result of accumulating the given transformation
4690	<	* of all entries using the given reducer to combine values,
4691	<	* and the given basis as an identity value.
4692	<	*
4693	<	* @param transformer a function returning the transformation
4694	<	* for an element
4695	<	* @param basis the identity (initial default value) for the reduction
4696	<	* @param reducer a commutative associative combining function
4697	<	* @return the result of accumulating the given transformation
4698	<	* of all entries
4699	<	*/
4700	<	public int reduceToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4701	<	int basis,
4702	<	IntByIntToInt reducer) {
4703	<	return ForkJoinTasks.reduceEntriesToInt
4704	<	(map, transformer, basis, reducer).invoke();
4623	>	public void forEach(Action<? super Map.Entry<K,V>> action) {
4624	>	if (action == null) throw new NullPointerException();
4625	>	Node<K,V>[] t;
4626	>	if ((t = map.table) != null) {
4627	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4628	>	for (Node<K,V> p; (p = it.advance()) != null; )
4629	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
4630	>	}
4631		}
4632
4633		}
4634
4635	<	// ---------------------------------------------------------------------
4635	>	// -------------------------------------------------------
4636
4637		/**
4638	<	* Predefined tasks for performing bulk parallel operations on
4639	<	* ConcurrentHashMapV8s. These tasks follow the forms and rules used
4714	<	* for bulk operations. Each method has the same name, but returns
4715	<	* a task rather than invoking it. These methods may be useful in
4716	<	* custom applications such as submitting a task without waiting
4717	<	* for completion, using a custom pool, or combining with other
4718	<	* tasks.
4638	>	* Base class for bulk tasks. Repeats some fields and code from
4639	>	* class Traverser, because we need to subclass CountedCompleter.
4640		*/
4641	<	public static class ForkJoinTasks {
4642	<	private ForkJoinTasks() {}
4643	<
4644	<	/**
4645	<	* Returns a task that when invoked, performs the given
4646	<	* action for each (key, value)
4647	<	*
4648	<	* @param map the map
4649	<	* @param action the action
4650	<	* @return the task
4651	<	*/
4652	<	public static <K,V> ForkJoinTask<Void> forEach
4653	<	(ConcurrentHashMapV8<K,V> map,
4654	<	BiAction<K,V> action) {
4655	<	if (action == null) throw new NullPointerException();
4656	<	return new ForEachMappingTask<K,V>(map, null, -1, action);
4657	<	}
4658	<
4659	<	/**
4660	<	* Returns a task that when invoked, performs the given
4661	<	* action for each non-null transformation of each (key, value)
4741	<	*
4742	<	* @param map the map
4743	<	* @param transformer a function returning the transformation
4744	<	* for an element, or null if there is no transformation (in
4745	<	* which case the action is not applied)
4746	<	* @param action the action
4747	<	* @return the task
4748	<	*/
4749	<	public static <K,V,U> ForkJoinTask<Void> forEach
4750	<	(ConcurrentHashMapV8<K,V> map,
4751	<	BiFun<? super K, ? super V, ? extends U> transformer,
4752	<	Action<U> action) {
4753	<	if (transformer == null || action == null)
4754	<	throw new NullPointerException();
4755	<	return new ForEachTransformedMappingTask<K,V,U>
4756	<	(map, null, -1, transformer, action);
4757	<	}
4758	<
4759	<	/**
4760	<	* Returns a task that when invoked, returns a non-null result
4761	<	* from applying the given search function on each (key,
4762	<	* value), or null if none. Upon success, further element
4763	<	* processing is suppressed and the results of any other
4764	<	* parallel invocations of the search function are ignored.
4765	<	*
4766	<	* @param map the map
4767	<	* @param searchFunction a function returning a non-null
4768	<	* result on success, else null
4769	<	* @return the task
4770	<	*/
4771	<	public static <K,V,U> ForkJoinTask<U> search
4772	<	(ConcurrentHashMapV8<K,V> map,
4773	<	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4774	<	if (searchFunction == null) throw new NullPointerException();
4775	<	return new SearchMappingsTask<K,V,U>
4776	<	(map, null, -1, searchFunction,
4777	<	new AtomicReference<U>());
4778	<	}
4779	<
4780	<	/**
4781	<	* Returns a task that when invoked, returns the result of
4782	<	* accumulating the given transformation of all (key, value) pairs
4783	<	* using the given reducer to combine values, or null if none.
4784	<	*
4785	<	* @param map the map
4786	<	* @param transformer a function returning the transformation
4787	<	* for an element, or null if there is no transformation (in
4788	<	* which case it is not combined).
4789	<	* @param reducer a commutative associative combining function
4790	<	* @return the task
4791	<	*/
4792	<	public static <K,V,U> ForkJoinTask<U> reduce
4793	<	(ConcurrentHashMapV8<K,V> map,
4794	<	BiFun<? super K, ? super V, ? extends U> transformer,
4795	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4796	<	if (transformer == null || reducer == null)
4797	<	throw new NullPointerException();
4798	<	return new MapReduceMappingsTask<K,V,U>
4799	<	(map, null, -1, null, transformer, reducer);
4800	<	}
4801	<
4802	<	/**
4803	<	* Returns a task that when invoked, returns the result of
4804	<	* accumulating the given transformation of all (key, value) pairs
4805	<	* using the given reducer to combine values, and the given
4806	<	* basis as an identity value.
4807	<	*
4808	<	* @param map the map
4809	<	* @param transformer a function returning the transformation
4810	<	* for an element
4811	<	* @param basis the identity (initial default value) for the reduction
4812	<	* @param reducer a commutative associative combining function
4813	<	* @return the task
4814	<	*/
4815	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4816	<	(ConcurrentHashMapV8<K,V> map,
4817	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
4818	<	double basis,
4819	<	DoubleByDoubleToDouble reducer) {
4820	<	if (transformer == null || reducer == null)
4821	<	throw new NullPointerException();
4822	<	return new MapReduceMappingsToDoubleTask<K,V>
4823	<	(map, null, -1, null, transformer, basis, reducer);
4824	<	}
4825	<
4826	<	/**
4827	<	* Returns a task that when invoked, returns the result of
4828	<	* accumulating the given transformation of all (key, value) pairs
4829	<	* using the given reducer to combine values, and the given
4830	<	* basis as an identity value.
4831	<	*
4832	<	* @param map the map
4833	<	* @param transformer a function returning the transformation
4834	<	* for an element
4835	<	* @param basis the identity (initial default value) for the reduction
4836	<	* @param reducer a commutative associative combining function
4837	<	* @return the task
4838	<	*/
4839	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4840	<	(ConcurrentHashMapV8<K,V> map,
4841	<	ObjectByObjectToLong<? super K, ? super V> transformer,
4842	<	long basis,
4843	<	LongByLongToLong reducer) {
4844	<	if (transformer == null || reducer == null)
4845	<	throw new NullPointerException();
4846	<	return new MapReduceMappingsToLongTask<K,V>
4847	<	(map, null, -1, null, transformer, basis, reducer);
4848	<	}
4849	<
4850	<	/**
4851	<	* Returns a task that when invoked, returns the result of
4852	<	* accumulating the given transformation of all (key, value) pairs
4853	<	* using the given reducer to combine values, and the given
4854	<	* basis as an identity value.
4855	<	*
4856	<	* @param transformer a function returning the transformation
4857	<	* for an element
4858	<	* @param basis the identity (initial default value) for the reduction
4859	<	* @param reducer a commutative associative combining function
4860	<	* @return the task
4861	<	*/
4862	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4863	<	(ConcurrentHashMapV8<K,V> map,
4864	<	ObjectByObjectToInt<? super K, ? super V> transformer,
4865	<	int basis,
4866	<	IntByIntToInt reducer) {
4867	<	if (transformer == null || reducer == null)
4868	<	throw new NullPointerException();
4869	<	return new MapReduceMappingsToIntTask<K,V>
4870	<	(map, null, -1, null, transformer, basis, reducer);
4871	<	}
4872	<
4873	<	/**
4874	<	* Returns a task that when invoked, performs the given action
4875	<	* for each key.
4876	<	*
4877	<	* @param map the map
4878	<	* @param action the action
4879	<	* @return the task
4880	<	*/
4881	<	public static <K,V> ForkJoinTask<Void> forEachKey
4882	<	(ConcurrentHashMapV8<K,V> map,
4883	<	Action<K> action) {
4884	<	if (action == null) throw new NullPointerException();
4885	<	return new ForEachKeyTask<K,V>(map, null, -1, action);
4886	<	}
4887	<
4888	<	/**
4889	<	* Returns a task that when invoked, performs the given action
4890	<	* for each non-null transformation of each key.
4891	<	*
4892	<	* @param map the map
4893	<	* @param transformer a function returning the transformation
4894	<	* for an element, or null if there is no transformation (in
4895	<	* which case the action is not applied)
4896	<	* @param action the action
4897	<	* @return the task
4898	<	*/
4899	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4900	<	(ConcurrentHashMapV8<K,V> map,
4901	<	Fun<? super K, ? extends U> transformer,
4902	<	Action<U> action) {
4903	<	if (transformer == null || action == null)
4904	<	throw new NullPointerException();
4905	<	return new ForEachTransformedKeyTask<K,V,U>
4906	<	(map, null, -1, transformer, action);
4907	<	}
4908	<
4909	<	/**
4910	<	* Returns a task that when invoked, returns a non-null result
4911	<	* from applying the given search function on each key, or
4912	<	* null if none.  Upon success, further element processing is
4913	<	* suppressed and the results of any other parallel
4914	<	* invocations of the search function are ignored.
4915	<	*
4916	<	* @param map the map
4917	<	* @param searchFunction a function returning a non-null
4918	<	* result on success, else null
4919	<	* @return the task
4920	<	*/
4921	<	public static <K,V,U> ForkJoinTask<U> searchKeys
4922	<	(ConcurrentHashMapV8<K,V> map,
4923	<	Fun<? super K, ? extends U> searchFunction) {
4924	<	if (searchFunction == null) throw new NullPointerException();
4925	<	return new SearchKeysTask<K,V,U>
4926	<	(map, null, -1, searchFunction,
4927	<	new AtomicReference<U>());
4928	<	}
4929	<
4930	<	/**
4931	<	* Returns a task that when invoked, returns the result of
4932	<	* accumulating all keys using the given reducer to combine
4933	<	* values, or null if none.
4934	<	*
4935	<	* @param map the map
4936	<	* @param reducer a commutative associative combining function
4937	<	* @return the task
4938	<	*/
4939	<	public static <K,V> ForkJoinTask<K> reduceKeys
4940	<	(ConcurrentHashMapV8<K,V> map,
4941	<	BiFun<? super K, ? super K, ? extends K> reducer) {
4942	<	if (reducer == null) throw new NullPointerException();
4943	<	return new ReduceKeysTask<K,V>
4944	<	(map, null, -1, null, reducer);
4945	<	}
4946	<
4947	<	/**
4948	<	* Returns a task that when invoked, returns the result of
4949	<	* accumulating the given transformation of all keys using the given
4950	<	* reducer to combine values, or null if none.
4951	<	*
4952	<	* @param map the map
4953	<	* @param transformer a function returning the transformation
4954	<	* for an element, or null if there is no transformation (in
4955	<	* which case it is not combined).
4956	<	* @param reducer a commutative associative combining function
4957	<	* @return the task
4958	<	*/
4959	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
4960	<	(ConcurrentHashMapV8<K,V> map,
4961	<	Fun<? super K, ? extends U> transformer,
4962	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4963	<	if (transformer == null || reducer == null)
4964	<	throw new NullPointerException();
4965	<	return new MapReduceKeysTask<K,V,U>
4966	<	(map, null, -1, null, transformer, reducer);
4967	<	}
4968	<
4969	<	/**
4970	<	* Returns a task that when invoked, returns the result of
4971	<	* accumulating the given transformation of all keys using the given
4972	<	* reducer to combine values, and the given basis as an
4973	<	* identity value.
4974	<	*
4975	<	* @param map the map
4976	<	* @param transformer a function returning the transformation
4977	<	* for an element
4978	<	* @param basis the identity (initial default value) for the reduction
4979	<	* @param reducer a commutative associative combining function
4980	<	* @return the task
4981	<	*/
4982	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4983	<	(ConcurrentHashMapV8<K,V> map,
4984	<	ObjectToDouble<? super K> transformer,
4985	<	double basis,
4986	<	DoubleByDoubleToDouble reducer) {
4987	<	if (transformer == null || reducer == null)
4988	<	throw new NullPointerException();
4989	<	return new MapReduceKeysToDoubleTask<K,V>
4990	<	(map, null, -1, null, transformer, basis, reducer);
4991	<	}
4992	<
4993	<	/**
4994	<	* Returns a task that when invoked, returns the result of
4995	<	* accumulating the given transformation of all keys using the given
4996	<	* reducer to combine values, and the given basis as an
4997	<	* identity value.
4998	<	*
4999	<	* @param map the map
5000	<	* @param transformer a function returning the transformation
5001	<	* for an element
5002	<	* @param basis the identity (initial default value) for the reduction
5003	<	* @param reducer a commutative associative combining function
5004	<	* @return the task
5005	<	*/
5006	<	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
5007	<	(ConcurrentHashMapV8<K,V> map,
5008	<	ObjectToLong<? super K> transformer,
5009	<	long basis,
5010	<	LongByLongToLong reducer) {
5011	<	if (transformer == null || reducer == null)
5012	<	throw new NullPointerException();
5013	<	return new MapReduceKeysToLongTask<K,V>
5014	<	(map, null, -1, null, transformer, basis, reducer);
5015	<	}
5016	<
5017	<	/**
5018	<	* Returns a task that when invoked, returns the result of
5019	<	* accumulating the given transformation of all keys using the given
5020	<	* reducer to combine values, and the given basis as an
5021	<	* identity value.
5022	<	*
5023	<	* @param map the map
5024	<	* @param transformer a function returning the transformation
5025	<	* for an element
5026	<	* @param basis the identity (initial default value) for the reduction
5027	<	* @param reducer a commutative associative combining function
5028	<	* @return the task
5029	<	*/
5030	<	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
5031	<	(ConcurrentHashMapV8<K,V> map,
5032	<	ObjectToInt<? super K> transformer,
5033	<	int basis,
5034	<	IntByIntToInt reducer) {
5035	<	if (transformer == null || reducer == null)
5036	<	throw new NullPointerException();
5037	<	return new MapReduceKeysToIntTask<K,V>
5038	<	(map, null, -1, null, transformer, basis, reducer);
5039	<	}
5040	<
5041	<	/**
5042	<	* Returns a task that when invoked, performs the given action
5043	<	* for each value.
5044	<	*
5045	<	* @param map the map
5046	<	* @param action the action
5047	<	*/
5048	<	public static <K,V> ForkJoinTask<Void> forEachValue
5049	<	(ConcurrentHashMapV8<K,V> map,
5050	<	Action<V> action) {
5051	<	if (action == null) throw new NullPointerException();
5052	<	return new ForEachValueTask<K,V>(map, null, -1, action);
5053	<	}
5054	<
5055	<	/**
5056	<	* Returns a task that when invoked, performs the given action
5057	<	* for each non-null transformation of each value.
5058	<	*
5059	<	* @param map the map
5060	<	* @param transformer a function returning the transformation
5061	<	* for an element, or null if there is no transformation (in
5062	<	* which case the action is not applied)
5063	<	* @param action the action
5064	<	*/
5065	<	public static <K,V,U> ForkJoinTask<Void> forEachValue
5066	<	(ConcurrentHashMapV8<K,V> map,
5067	<	Fun<? super V, ? extends U> transformer,
5068	<	Action<U> action) {
5069	<	if (transformer == null || action == null)
5070	<	throw new NullPointerException();
5071	<	return new ForEachTransformedValueTask<K,V,U>
5072	<	(map, null, -1, transformer, action);
5073	<	}
5074	<
5075	<	/**
5076	<	* Returns a task that when invoked, returns a non-null result
5077	<	* from applying the given search function on each value, or
5078	<	* null if none.  Upon success, further element processing is
5079	<	* suppressed and the results of any other parallel
5080	<	* invocations of the search function are ignored.
5081	<	*
5082	<	* @param map the map
5083	<	* @param searchFunction a function returning a non-null
5084	<	* result on success, else null
5085	<	* @return the task
5086	<	*/
5087	<	public static <K,V,U> ForkJoinTask<U> searchValues
5088	<	(ConcurrentHashMapV8<K,V> map,
5089	<	Fun<? super V, ? extends U> searchFunction) {
5090	<	if (searchFunction == null) throw new NullPointerException();
5091	<	return new SearchValuesTask<K,V,U>
5092	<	(map, null, -1, searchFunction,
5093	<	new AtomicReference<U>());
5094	<	}
5095	<
5096	<	/**
5097	<	* Returns a task that when invoked, returns the result of
5098	<	* accumulating all values using the given reducer to combine
5099	<	* values, or null if none.
5100	<	*
5101	<	* @param map the map
5102	<	* @param reducer a commutative associative combining function
5103	<	* @return the task
5104	<	*/
5105	<	public static <K,V> ForkJoinTask<V> reduceValues
5106	<	(ConcurrentHashMapV8<K,V> map,
5107	<	BiFun<? super V, ? super V, ? extends V> reducer) {
5108	<	if (reducer == null) throw new NullPointerException();
5109	<	return new ReduceValuesTask<K,V>
5110	<	(map, null, -1, null, reducer);
5111	<	}
5112	<
5113	<	/**
5114	<	* Returns a task that when invoked, returns the result of
5115	<	* accumulating the given transformation of all values using the
5116	<	* given reducer to combine values, or null if none.
5117	<	*
5118	<	* @param map the map
5119	<	* @param transformer a function returning the transformation
5120	<	* for an element, or null if there is no transformation (in
5121	<	* which case it is not combined).
5122	<	* @param reducer a commutative associative combining function
5123	<	* @return the task
5124	<	*/
5125	<	public static <K,V,U> ForkJoinTask<U> reduceValues
5126	<	(ConcurrentHashMapV8<K,V> map,
5127	<	Fun<? super V, ? extends U> transformer,
5128	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5129	<	if (transformer == null || reducer == null)
5130	<	throw new NullPointerException();
5131	<	return new MapReduceValuesTask<K,V,U>
5132	<	(map, null, -1, null, transformer, reducer);
5133	<	}
5134	<
5135	<	/**
5136	<	* Returns a task that when invoked, returns the result of
5137	<	* accumulating the given transformation of all values using the
5138	<	* given reducer to combine values, and the given basis as an
5139	<	* identity value.
5140	<	*
5141	<	* @param map the map
5142	<	* @param transformer a function returning the transformation
5143	<	* for an element
5144	<	* @param basis the identity (initial default value) for the reduction
5145	<	* @param reducer a commutative associative combining function
5146	<	* @return the task
5147	<	*/
5148	<	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
5149	<	(ConcurrentHashMapV8<K,V> map,
5150	<	ObjectToDouble<? super V> transformer,
5151	<	double basis,
5152	<	DoubleByDoubleToDouble reducer) {
5153	<	if (transformer == null || reducer == null)
5154	<	throw new NullPointerException();
5155	<	return new MapReduceValuesToDoubleTask<K,V>
5156	<	(map, null, -1, null, transformer, basis, reducer);
5157	<	}
5158	<
5159	<	/**
5160	<	* Returns a task that when invoked, returns the result of
5161	<	* accumulating the given transformation of all values using the
5162	<	* given reducer to combine values, and the given basis as an
5163	<	* identity value.
5164	<	*
5165	<	* @param map the map
5166	<	* @param transformer a function returning the transformation
5167	<	* for an element
5168	<	* @param basis the identity (initial default value) for the reduction
5169	<	* @param reducer a commutative associative combining function
5170	<	* @return the task
5171	<	*/
5172	<	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
5173	<	(ConcurrentHashMapV8<K,V> map,
5174	<	ObjectToLong<? super V> transformer,
5175	<	long basis,
5176	<	LongByLongToLong reducer) {
5177	<	if (transformer == null || reducer == null)
5178	<	throw new NullPointerException();
5179	<	return new MapReduceValuesToLongTask<K,V>
5180	<	(map, null, -1, null, transformer, basis, reducer);
5181	<	}
5182	<
5183	<	/**
5184	<	* Returns a task that when invoked, returns the result of
5185	<	* accumulating the given transformation of all values using the
5186	<	* given reducer to combine values, and the given basis as an
5187	<	* identity value.
5188	<	*
5189	<	* @param map the map
5190	<	* @param transformer a function returning the transformation
5191	<	* for an element
5192	<	* @param basis the identity (initial default value) for the reduction
5193	<	* @param reducer a commutative associative combining function
5194	<	* @return the task
5195	<	*/
5196	<	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
5197	<	(ConcurrentHashMapV8<K,V> map,
5198	<	ObjectToInt<? super V> transformer,
5199	<	int basis,
5200	<	IntByIntToInt reducer) {
5201	<	if (transformer == null || reducer == null)
5202	<	throw new NullPointerException();
5203	<	return new MapReduceValuesToIntTask<K,V>
5204	<	(map, null, -1, null, transformer, basis, reducer);
5205	<	}
5206	<
5207	<	/**
5208	<	* Returns a task that when invoked, perform the given action
5209	<	* for each entry.
5210	<	*
5211	<	* @param map the map
5212	<	* @param action the action
5213	<	*/
5214	<	public static <K,V> ForkJoinTask<Void> forEachEntry
5215	<	(ConcurrentHashMapV8<K,V> map,
5216	<	Action<Map.Entry<K,V>> action) {
5217	<	if (action == null) throw new NullPointerException();
5218	<	return new ForEachEntryTask<K,V>(map, null, -1, action);
5219	<	}
5220	<
5221	<	/**
5222	<	* Returns a task that when invoked, perform the given action
5223	<	* for each non-null transformation of each entry.
5224	<	*
5225	<	* @param map the map
5226	<	* @param transformer a function returning the transformation
5227	<	* for an element, or null if there is no transformation (in
5228	<	* which case the action is not applied)
5229	<	* @param action the action
5230	<	*/
5231	<	public static <K,V,U> ForkJoinTask<Void> forEachEntry
5232	<	(ConcurrentHashMapV8<K,V> map,
5233	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5234	<	Action<U> action) {
5235	<	if (transformer == null || action == null)
5236	<	throw new NullPointerException();
5237	<	return new ForEachTransformedEntryTask<K,V,U>
5238	<	(map, null, -1, transformer, action);
5239	<	}
5240	<
5241	<	/**
5242	<	* Returns a task that when invoked, returns a non-null result
5243	<	* from applying the given search function on each entry, or
5244	<	* null if none.  Upon success, further element processing is
5245	<	* suppressed and the results of any other parallel
5246	<	* invocations of the search function are ignored.
5247	<	*
5248	<	* @param map the map
5249	<	* @param searchFunction a function returning a non-null
5250	<	* result on success, else null
5251	<	* @return the task
5252	<	*/
5253	<	public static <K,V,U> ForkJoinTask<U> searchEntries
5254	<	(ConcurrentHashMapV8<K,V> map,
5255	<	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
5256	<	if (searchFunction == null) throw new NullPointerException();
5257	<	return new SearchEntriesTask<K,V,U>
5258	<	(map, null, -1, searchFunction,
5259	<	new AtomicReference<U>());
5260	<	}
5261	<
5262	<	/**
5263	<	* Returns a task that when invoked, returns the result of
5264	<	* accumulating all entries using the given reducer to combine
5265	<	* values, or null if none.
5266	<	*
5267	<	* @param map the map
5268	<	* @param reducer a commutative associative combining function
5269	<	* @return the task
5270	<	*/
5271	<	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
5272	<	(ConcurrentHashMapV8<K,V> map,
5273	<	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5274	<	if (reducer == null) throw new NullPointerException();
5275	<	return new ReduceEntriesTask<K,V>
5276	<	(map, null, -1, null, reducer);
5277	<	}
5278	<
5279	<	/**
5280	<	* Returns a task that when invoked, returns the result of
5281	<	* accumulating the given transformation of all entries using the
5282	<	* given reducer to combine values, or null if none.
5283	<	*
5284	<	* @param map the map
5285	<	* @param transformer a function returning the transformation
5286	<	* for an element, or null if there is no transformation (in
5287	<	* which case it is not combined).
5288	<	* @param reducer a commutative associative combining function
5289	<	* @return the task
5290	<	*/
5291	<	public static <K,V,U> ForkJoinTask<U> reduceEntries
5292	<	(ConcurrentHashMapV8<K,V> map,
5293	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5294	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5295	<	if (transformer == null || reducer == null)
5296	<	throw new NullPointerException();
5297	<	return new MapReduceEntriesTask<K,V,U>
5298	<	(map, null, -1, null, transformer, reducer);
5299	<	}
5300	<
5301	<	/**
5302	<	* Returns a task that when invoked, returns the result of
5303	<	* accumulating the given transformation of all entries using the
5304	<	* given reducer to combine values, and the given basis as an
5305	<	* identity value.
5306	<	*
5307	<	* @param map the map
5308	<	* @param transformer a function returning the transformation
5309	<	* for an element
5310	<	* @param basis the identity (initial default value) for the reduction
5311	<	* @param reducer a commutative associative combining function
5312	<	* @return the task
5313	<	*/
5314	<	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
5315	<	(ConcurrentHashMapV8<K,V> map,
5316	<	ObjectToDouble<Map.Entry<K,V>> transformer,
5317	<	double basis,
5318	<	DoubleByDoubleToDouble reducer) {
5319	<	if (transformer == null || reducer == null)
5320	<	throw new NullPointerException();
5321	<	return new MapReduceEntriesToDoubleTask<K,V>
5322	<	(map, null, -1, null, transformer, basis, reducer);
5323	<	}
5324	<
5325	<	/**
5326	<	* Returns a task that when invoked, returns the result of
5327	<	* accumulating the given transformation of all entries using the
5328	<	* given reducer to combine values, and the given basis as an
5329	<	* identity value.
5330	<	*
5331	<	* @param map the map
5332	<	* @param transformer a function returning the transformation
5333	<	* for an element
5334	<	* @param basis the identity (initial default value) for the reduction
5335	<	* @param reducer a commutative associative combining function
5336	<	* @return the task
5337	<	*/
5338	<	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
5339	<	(ConcurrentHashMapV8<K,V> map,
5340	<	ObjectToLong<Map.Entry<K,V>> transformer,
5341	<	long basis,
5342	<	LongByLongToLong reducer) {
5343	<	if (transformer == null || reducer == null)
5344	<	throw new NullPointerException();
5345	<	return new MapReduceEntriesToLongTask<K,V>
5346	<	(map, null, -1, null, transformer, basis, reducer);
4641	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4642	>	Node<K,V>[] tab;        // same as Traverser
4643	>	Node<K,V> next;
4644	>	int index;
4645	>	int baseIndex;
4646	>	int baseLimit;
4647	>	final int baseSize;
4648	>	int batch;              // split control
4649	>
4650	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4651	>	super(par);
4652	>	this.batch = b;
4653	>	this.index = this.baseIndex = i;
4654	>	if ((this.tab = t) == null)
4655	>	this.baseSize = this.baseLimit = 0;
4656	>	else if (par == null)
4657	>	this.baseSize = this.baseLimit = t.length;
4658	>	else {
4659	>	this.baseLimit = f;
4660	>	this.baseSize = par.baseSize;
4661	>	}
4662		}
4663
4664		/**
4665	<	* Returns a task that when invoked, returns the result of
5351	<	* accumulating the given transformation of all entries using the
5352	<	* given reducer to combine values, and the given basis as an
5353	<	* identity value.
5354	<	*
5355	<	* @param map the map
5356	<	* @param transformer a function returning the transformation
5357	<	* for an element
5358	<	* @param basis the identity (initial default value) for the reduction
5359	<	* @param reducer a commutative associative combining function
5360	<	* @return the task
4665	>	* Same as Traverser version
4666		*/
4667	<	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
4668	<	(ConcurrentHashMapV8<K,V> map,
4669	<	ObjectToInt<Map.Entry<K,V>> transformer,
4670	<	int basis,
4671	<	IntByIntToInt reducer) {
4672	<	if (transformer == null || reducer == null)
4673	<	throw new NullPointerException();
4674	<	return new MapReduceEntriesToIntTask<K,V>
4675	<	(map, null, -1, null, transformer, basis, reducer);
4667	>	final Node<K,V> advance() {
4668	>	Node<K,V> e;
4669	>	if ((e = next) != null)
4670	>	e = e.next;
4671	>	for (;;) {
4672	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4673	>	if (e != null)
4674	>	return next = e;
4675	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4676	>	(n = t.length) <= (i = index) || i < 0)
4677	>	return next = null;
4678	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4679	>	if (e instanceof ForwardingNode) {
4680	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4681	>	e = null;
4682	>	continue;
4683	>	}
4684	>	else if (e instanceof TreeBin)
4685	>	e = ((TreeBin<K,V>)e).first;
4686	>	else
4687	>	e = null;
4688	>	}
4689	>	if ((index += baseSize) >= n)
4690	>	index = ++baseIndex;    // visit upper slots if present
4691	>	}
4692		}
4693		}
4694
5374	–	// -------------------------------------------------------
5375	–
4695		/*
4696		* Task classes. Coded in a regular but ugly format/style to
4697		* simplify checks that each variant differs in the right way from
4698	<	* others.
4699	<	*/
4700	<
4701	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4702	<	extends Traverser<K,V,Void> {
4703	<	final Action<K> action;
4698	>	* others. The null screenings exist because compilers cannot tell
4699	>	* that we've already null-checked task arguments, so we force
4700	>	* simplest hoisted bypass to help avoid convoluted traps.
4701	>	*/
4702	>	@SuppressWarnings("serial")
4703	>	static final class ForEachKeyTask<K,V>
4704	>	extends BulkTask<K,V,Void> {
4705	>	final Action<? super K> action;
4706		ForEachKeyTask
4707	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4708	<	Action<K> action) {
4709	<	super(m, p, b);
4707	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4708	>	Action<? super K> action) {
4709	>	super(p, b, i, f, t);
4710		this.action = action;
4711		}
4712	<	@SuppressWarnings("unchecked") public final void compute() {
4713	<	final Action<K> action;
4714	<	if ((action = this.action) == null)
4715	<	throw new NullPointerException();
4716	<	for (int b; (b = preSplit()) > 0;)
4717	<	new ForEachKeyTask<K,V>(map, this, b, action).fork();
4718	<	while (advance() != null)
4719	<	action.apply((K)nextKey);
4720	<	propagateCompletion();
4712	>	public final void compute() {
4713	>	final Action<? super K> action;
4714	>	if ((action = this.action) != null) {
4715	>	for (int i = baseIndex, f, h; batch > 0 &&
4716	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4717	>	addToPendingCount(1);
4718	>	new ForEachKeyTask<K,V>
4719	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4720	>	action).fork();
4721	>	}
4722	>	for (Node<K,V> p; (p = advance()) != null;)
4723	>	action.apply(p.key);
4724	>	propagateCompletion();
4725	>	}
4726		}
4727		}
4728
4729	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4730	<	extends Traverser<K,V,Void> {
4731	<	final Action<V> action;
4729	>	@SuppressWarnings("serial")
4730	>	static final class ForEachValueTask<K,V>
4731	>	extends BulkTask<K,V,Void> {
4732	>	final Action<? super V> action;
4733		ForEachValueTask
4734	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4735	<	Action<V> action) {
4736	<	super(m, p, b);
4734	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4735	>	Action<? super V> action) {
4736	>	super(p, b, i, f, t);
4737		this.action = action;
4738		}
4739	<	@SuppressWarnings("unchecked") public final void compute() {
4740	<	final Action<V> action;
4741	<	if ((action = this.action) == null)
4742	<	throw new NullPointerException();
4743	<	for (int b; (b = preSplit()) > 0;)
4744	<	new ForEachValueTask<K,V>(map, this, b, action).fork();
4745	<	Object v;
4746	<	while ((v = advance()) != null)
4747	<	action.apply((V)v);
4748	<	propagateCompletion();
4739	>	public final void compute() {
4740	>	final Action<? super V> action;
4741	>	if ((action = this.action) != null) {
4742	>	for (int i = baseIndex, f, h; batch > 0 &&
4743	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4744	>	addToPendingCount(1);
4745	>	new ForEachValueTask<K,V>
4746	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4747	>	action).fork();
4748	>	}
4749	>	for (Node<K,V> p; (p = advance()) != null;)
4750	>	action.apply(p.val);
4751	>	propagateCompletion();
4752	>	}
4753		}
4754		}
4755
4756	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4757	<	extends Traverser<K,V,Void> {
4758	<	final Action<Entry<K,V>> action;
4756	>	@SuppressWarnings("serial")
4757	>	static final class ForEachEntryTask<K,V>
4758	>	extends BulkTask<K,V,Void> {
4759	>	final Action<? super Entry<K,V>> action;
4760		ForEachEntryTask
4761	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4762	<	Action<Entry<K,V>> action) {
4763	<	super(m, p, b);
4761	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4762	>	Action<? super Entry<K,V>> action) {
4763	>	super(p, b, i, f, t);
4764		this.action = action;
4765		}
4766	<	@SuppressWarnings("unchecked") public final void compute() {
4767	<	final Action<Entry<K,V>> action;
4768	<	if ((action = this.action) == null)
4769	<	throw new NullPointerException();
4770	<	for (int b; (b = preSplit()) > 0;)
4771	<	new ForEachEntryTask<K,V>(map, this, b, action).fork();
4772	<	Object v;
4773	<	while ((v = advance()) != null)
4774	<	action.apply(entryFor((K)nextKey, (V)v));
4775	<	propagateCompletion();
4766	>	public final void compute() {
4767	>	final Action<? super Entry<K,V>> action;
4768	>	if ((action = this.action) != null) {
4769	>	for (int i = baseIndex, f, h; batch > 0 &&
4770	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4771	>	addToPendingCount(1);
4772	>	new ForEachEntryTask<K,V>
4773	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4774	>	action).fork();
4775	>	}
4776	>	for (Node<K,V> p; (p = advance()) != null; )
4777	>	action.apply(p);
4778	>	propagateCompletion();
4779	>	}
4780		}
4781		}
4782
4783	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4784	<	extends Traverser<K,V,Void> {
4785	<	final BiAction<K,V> action;
4783	>	@SuppressWarnings("serial")
4784	>	static final class ForEachMappingTask<K,V>
4785	>	extends BulkTask<K,V,Void> {
4786	>	final BiAction<? super K, ? super V> action;
4787		ForEachMappingTask
4788	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4789	<	BiAction<K,V> action) {
4790	<	super(m, p, b);
4788	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4789	>	BiAction<? super K,? super V> action) {
4790	>	super(p, b, i, f, t);
4791		this.action = action;
4792		}
4793	<	@SuppressWarnings("unchecked") public final void compute() {
4794	<	final BiAction<K,V> action;
4795	<	if ((action = this.action) == null)
4796	<	throw new NullPointerException();
4797	<	for (int b; (b = preSplit()) > 0;)
4798	<	new ForEachMappingTask<K,V>(map, this, b, action).fork();
4799	<	Object v;
4800	<	while ((v = advance()) != null)
4801	<	action.apply((K)nextKey, (V)v);
4802	<	propagateCompletion();
4793	>	public final void compute() {
4794	>	final BiAction<? super K, ? super V> action;
4795	>	if ((action = this.action) != null) {
4796	>	for (int i = baseIndex, f, h; batch > 0 &&
4797	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4798	>	addToPendingCount(1);
4799	>	new ForEachMappingTask<K,V>
4800	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4801	>	action).fork();
4802	>	}
4803	>	for (Node<K,V> p; (p = advance()) != null; )
4804	>	action.apply(p.key, p.val);
4805	>	propagateCompletion();
4806	>	}
4807		}
4808		}
4809
4810	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4811	<	extends Traverser<K,V,Void> {
4810	>	@SuppressWarnings("serial")
4811	>	static final class ForEachTransformedKeyTask<K,V,U>
4812	>	extends BulkTask<K,V,Void> {
4813		final Fun<? super K, ? extends U> transformer;
4814	<	final Action<U> action;
4814	>	final Action<? super U> action;
4815		ForEachTransformedKeyTask
4816	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4817	<	Fun<? super K, ? extends U> transformer, Action<U> action) {
4818	<	super(m, p, b);
4816	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4817	>	Fun<? super K, ? extends U> transformer, Action<? super U> action) {
4818	>	super(p, b, i, f, t);
4819		this.transformer = transformer; this.action = action;
4820		}
4821	<	@SuppressWarnings("unchecked") public final void compute() {
4821	>	public final void compute() {
4822		final Fun<? super K, ? extends U> transformer;
4823	<	final Action<U> action;
4824	<	if ((transformer = this.transformer) == null ||
4825	<	(action = this.action) == null)
4826	<	throw new NullPointerException();
4827	<	for (int b; (b = preSplit()) > 0;)
4828	<	new ForEachTransformedKeyTask<K,V,U>
4829	<	(map, this, b, transformer, action).fork();
4830	<	U u;
4831	<	while (advance() != null) {
4832	<	if ((u = transformer.apply((K)nextKey)) != null)
4833	<	action.apply(u);
4823	>	final Action<? super U> action;
4824	>	if ((transformer = this.transformer) != null &&
4825	>	(action = this.action) != null) {
4826	>	for (int i = baseIndex, f, h; batch > 0 &&
4827	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4828	>	addToPendingCount(1);
4829	>	new ForEachTransformedKeyTask<K,V,U>
4830	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4831	>	transformer, action).fork();
4832	>	}
4833	>	for (Node<K,V> p; (p = advance()) != null; ) {
4834	>	U u;
4835	>	if ((u = transformer.apply(p.key)) != null)
4836	>	action.apply(u);
4837	>	}
4838	>	propagateCompletion();
4839		}
5493	–	propagateCompletion();
4840		}
4841		}
4842
4843	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4844	<	extends Traverser<K,V,Void> {
4843	>	@SuppressWarnings("serial")
4844	>	static final class ForEachTransformedValueTask<K,V,U>
4845	>	extends BulkTask<K,V,Void> {
4846		final Fun<? super V, ? extends U> transformer;
4847	<	final Action<U> action;
4847	>	final Action<? super U> action;
4848		ForEachTransformedValueTask
4849	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4850	<	Fun<? super V, ? extends U> transformer, Action<U> action) {
4851	<	super(m, p, b);
4849	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4850	>	Fun<? super V, ? extends U> transformer, Action<? super U> action) {
4851	>	super(p, b, i, f, t);
4852		this.transformer = transformer; this.action = action;
4853		}
4854	<	@SuppressWarnings("unchecked") public final void compute() {
4854	>	public final void compute() {
4855		final Fun<? super V, ? extends U> transformer;
4856	<	final Action<U> action;
4857	<	if ((transformer = this.transformer) == null ||
4858	<	(action = this.action) == null)
4859	<	throw new NullPointerException();
4860	<	for (int b; (b = preSplit()) > 0;)
4861	<	new ForEachTransformedValueTask<K,V,U>
4862	<	(map, this, b, transformer, action).fork();
4863	<	Object v; U u;
4864	<	while ((v = advance()) != null) {
4865	<	if ((u = transformer.apply((V)v)) != null)
4866	<	action.apply(u);
4856	>	final Action<? super U> action;
4857	>	if ((transformer = this.transformer) != null &&
4858	>	(action = this.action) != null) {
4859	>	for (int i = baseIndex, f, h; batch > 0 &&
4860	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4861	>	addToPendingCount(1);
4862	>	new ForEachTransformedValueTask<K,V,U>
4863	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4864	>	transformer, action).fork();
4865	>	}
4866	>	for (Node<K,V> p; (p = advance()) != null; ) {
4867	>	U u;
4868	>	if ((u = transformer.apply(p.val)) != null)
4869	>	action.apply(u);
4870	>	}
4871	>	propagateCompletion();
4872		}
5521	–	propagateCompletion();
4873		}
4874		}
4875
4876	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4877	<	extends Traverser<K,V,Void> {
4876	>	@SuppressWarnings("serial")
4877	>	static final class ForEachTransformedEntryTask<K,V,U>
4878	>	extends BulkTask<K,V,Void> {
4879		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4880	<	final Action<U> action;
4880	>	final Action<? super U> action;
4881		ForEachTransformedEntryTask
4882	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4883	<	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<U> action) {
4884	<	super(m, p, b);
4882	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4883	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<? super U> action) {
4884	>	super(p, b, i, f, t);
4885		this.transformer = transformer; this.action = action;
4886		}
4887	<	@SuppressWarnings("unchecked") public final void compute() {
4887	>	public final void compute() {
4888		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4889	<	final Action<U> action;
4890	<	if ((transformer = this.transformer) == null ||
4891	<	(action = this.action) == null)
4892	<	throw new NullPointerException();
4893	<	for (int b; (b = preSplit()) > 0;)
4894	<	new ForEachTransformedEntryTask<K,V,U>
4895	<	(map, this, b, transformer, action).fork();
4896	<	Object v; U u;
4897	<	while ((v = advance()) != null) {
4898	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
4899	<	action.apply(u);
4889	>	final Action<? super U> action;
4890	>	if ((transformer = this.transformer) != null &&
4891	>	(action = this.action) != null) {
4892	>	for (int i = baseIndex, f, h; batch > 0 &&
4893	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4894	>	addToPendingCount(1);
4895	>	new ForEachTransformedEntryTask<K,V,U>
4896	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4897	>	transformer, action).fork();
4898	>	}
4899	>	for (Node<K,V> p; (p = advance()) != null; ) {
4900	>	U u;
4901	>	if ((u = transformer.apply(p)) != null)
4902	>	action.apply(u);
4903	>	}
4904	>	propagateCompletion();
4905		}
5549	–	propagateCompletion();
4906		}
4907		}
4908
4909	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4910	<	extends Traverser<K,V,Void> {
4909	>	@SuppressWarnings("serial")
4910	>	static final class ForEachTransformedMappingTask<K,V,U>
4911	>	extends BulkTask<K,V,Void> {
4912		final BiFun<? super K, ? super V, ? extends U> transformer;
4913	<	final Action<U> action;
4913	>	final Action<? super U> action;
4914		ForEachTransformedMappingTask
4915	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4915	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4916		BiFun<? super K, ? super V, ? extends U> transformer,
4917	<	Action<U> action) {
4918	<	super(m, p, b);
4917	>	Action<? super U> action) {
4918	>	super(p, b, i, f, t);
4919		this.transformer = transformer; this.action = action;
4920		}
4921	<	@SuppressWarnings("unchecked") public final void compute() {
4921	>	public final void compute() {
4922		final BiFun<? super K, ? super V, ? extends U> transformer;
4923	<	final Action<U> action;
4924	<	if ((transformer = this.transformer) == null ||
4925	<	(action = this.action) == null)
4926	<	throw new NullPointerException();
4927	<	for (int b; (b = preSplit()) > 0;)
4928	<	new ForEachTransformedMappingTask<K,V,U>
4929	<	(map, this, b, transformer, action).fork();
4930	<	Object v; U u;
4931	<	while ((v = advance()) != null) {
4932	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
4933	<	action.apply(u);
4923	>	final Action<? super U> action;
4924	>	if ((transformer = this.transformer) != null &&
4925	>	(action = this.action) != null) {
4926	>	for (int i = baseIndex, f, h; batch > 0 &&
4927	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4928	>	addToPendingCount(1);
4929	>	new ForEachTransformedMappingTask<K,V,U>
4930	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4931	>	transformer, action).fork();
4932	>	}
4933	>	for (Node<K,V> p; (p = advance()) != null; ) {
4934	>	U u;
4935	>	if ((u = transformer.apply(p.key, p.val)) != null)
4936	>	action.apply(u);
4937	>	}
4938	>	propagateCompletion();
4939		}
5578	–	propagateCompletion();
4940		}
4941		}
4942
4943	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4944	<	extends Traverser<K,V,U> {
4943	>	@SuppressWarnings("serial")
4944	>	static final class SearchKeysTask<K,V,U>
4945	>	extends BulkTask<K,V,U> {
4946		final Fun<? super K, ? extends U> searchFunction;
4947		final AtomicReference<U> result;
4948		SearchKeysTask
4949	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4949	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4950		Fun<? super K, ? extends U> searchFunction,
4951		AtomicReference<U> result) {
4952	<	super(m, p, b);
4952	>	super(p, b, i, f, t);
4953		this.searchFunction = searchFunction; this.result = result;
4954		}
4955		public final U getRawResult() { return result.get(); }
4956	<	@SuppressWarnings("unchecked") public final void compute() {
4956	>	public final void compute() {
4957		final Fun<? super K, ? extends U> searchFunction;
4958		final AtomicReference<U> result;
4959	<	if ((searchFunction = this.searchFunction) == null ||
4960	<	(result = this.result) == null)
4961	<	throw new NullPointerException();
4962	<	for (int b;;) {
4963	<	if (result.get() != null)
4964	<	return;
4965	<	if ((b = preSplit()) <= 0)
4966	<	break;
4967	<	new SearchKeysTask<K,V,U>
4968	<	(map, this, b, searchFunction, result).fork();
4969	<	}
4970	<	while (result.get() == null) {
4971	<	U u;
4972	<	if (advance() == null) {
4973	<	propagateCompletion();
4974	<	break;
4975	<	}
4976	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
4977	<	if (result.compareAndSet(null, u))
4978	<	quietlyCompleteRoot();
4979	<	break;
4959	>	if ((searchFunction = this.searchFunction) != null &&
4960	>	(result = this.result) != null) {
4961	>	for (int i = baseIndex, f, h; batch > 0 &&
4962	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4963	>	if (result.get() != null)
4964	>	return;
4965	>	addToPendingCount(1);
4966	>	new SearchKeysTask<K,V,U>
4967	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4968	>	searchFunction, result).fork();
4969	>	}
4970	>	while (result.get() == null) {
4971	>	U u;
4972	>	Node<K,V> p;
4973	>	if ((p = advance()) == null) {
4974	>	propagateCompletion();
4975	>	break;
4976	>	}
4977	>	if ((u = searchFunction.apply(p.key)) != null) {
4978	>	if (result.compareAndSet(null, u))
4979	>	quietlyCompleteRoot();
4980	>	break;
4981	>	}
4982		}
4983		}
4984		}
4985		}
4986
4987	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
4988	<	extends Traverser<K,V,U> {
4987	>	@SuppressWarnings("serial")
4988	>	static final class SearchValuesTask<K,V,U>
4989	>	extends BulkTask<K,V,U> {
4990		final Fun<? super V, ? extends U> searchFunction;
4991		final AtomicReference<U> result;
4992		SearchValuesTask
4993	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4993	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4994		Fun<? super V, ? extends U> searchFunction,
4995		AtomicReference<U> result) {
4996	<	super(m, p, b);
4996	>	super(p, b, i, f, t);
4997		this.searchFunction = searchFunction; this.result = result;
4998		}
4999		public final U getRawResult() { return result.get(); }
5000	<	@SuppressWarnings("unchecked") public final void compute() {
5000	>	public final void compute() {
5001		final Fun<? super V, ? extends U> searchFunction;
5002		final AtomicReference<U> result;
5003	<	if ((searchFunction = this.searchFunction) == null ||
5004	<	(result = this.result) == null)
5005	<	throw new NullPointerException();
5006	<	for (int b;;) {
5007	<	if (result.get() != null)
5008	<	return;
5009	<	if ((b = preSplit()) <= 0)
5010	<	break;
5011	<	new SearchValuesTask<K,V,U>
5012	<	(map, this, b, searchFunction, result).fork();
5013	<	}
5014	<	while (result.get() == null) {
5015	<	Object v; U u;
5016	<	if ((v = advance()) == null) {
5017	<	propagateCompletion();
5018	<	break;
5019	<	}
5020	<	if ((u = searchFunction.apply((V)v)) != null) {
5021	<	if (result.compareAndSet(null, u))
5022	<	quietlyCompleteRoot();
5023	<	break;
5003	>	if ((searchFunction = this.searchFunction) != null &&
5004	>	(result = this.result) != null) {
5005	>	for (int i = baseIndex, f, h; batch > 0 &&
5006	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5007	>	if (result.get() != null)
5008	>	return;
5009	>	addToPendingCount(1);
5010	>	new SearchValuesTask<K,V,U>
5011	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5012	>	searchFunction, result).fork();
5013	>	}
5014	>	while (result.get() == null) {
5015	>	U u;
5016	>	Node<K,V> p;
5017	>	if ((p = advance()) == null) {
5018	>	propagateCompletion();
5019	>	break;
5020	>	}
5021	>	if ((u = searchFunction.apply(p.val)) != null) {
5022	>	if (result.compareAndSet(null, u))
5023	>	quietlyCompleteRoot();
5024	>	break;
5025	>	}
5026		}
5027		}
5028		}
5029		}
5030
5031	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5032	<	extends Traverser<K,V,U> {
5031	>	@SuppressWarnings("serial")
5032	>	static final class SearchEntriesTask<K,V,U>
5033	>	extends BulkTask<K,V,U> {
5034		final Fun<Entry<K,V>, ? extends U> searchFunction;
5035		final AtomicReference<U> result;
5036		SearchEntriesTask
5037	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5037	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5038		Fun<Entry<K,V>, ? extends U> searchFunction,
5039		AtomicReference<U> result) {
5040	<	super(m, p, b);
5040	>	super(p, b, i, f, t);
5041		this.searchFunction = searchFunction; this.result = result;
5042		}
5043		public final U getRawResult() { return result.get(); }
5044	<	@SuppressWarnings("unchecked") public final void compute() {
5044	>	public final void compute() {
5045		final Fun<Entry<K,V>, ? extends U> searchFunction;
5046		final AtomicReference<U> result;
5047	<	if ((searchFunction = this.searchFunction) == null ||
5048	<	(result = this.result) == null)
5049	<	throw new NullPointerException();
5050	<	for (int b;;) {
5051	<	if (result.get() != null)
5052	<	return;
5053	<	if ((b = preSplit()) <= 0)
5054	<	break;
5055	<	new SearchEntriesTask<K,V,U>
5056	<	(map, this, b, searchFunction, result).fork();
5057	<	}
5058	<	while (result.get() == null) {
5059	<	Object v; U u;
5060	<	if ((v = advance()) == null) {
5061	<	propagateCompletion();
5062	<	break;
5063	<	}
5064	<	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
5065	<	if (result.compareAndSet(null, u))
5066	<	quietlyCompleteRoot();
5067	<	return;
5047	>	if ((searchFunction = this.searchFunction) != null &&
5048	>	(result = this.result) != null) {
5049	>	for (int i = baseIndex, f, h; batch > 0 &&
5050	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5051	>	if (result.get() != null)
5052	>	return;
5053	>	addToPendingCount(1);
5054	>	new SearchEntriesTask<K,V,U>
5055	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5056	>	searchFunction, result).fork();
5057	>	}
5058	>	while (result.get() == null) {
5059	>	U u;
5060	>	Node<K,V> p;
5061	>	if ((p = advance()) == null) {
5062	>	propagateCompletion();
5063	>	break;
5064	>	}
5065	>	if ((u = searchFunction.apply(p)) != null) {
5066	>	if (result.compareAndSet(null, u))
5067	>	quietlyCompleteRoot();
5068	>	return;
5069	>	}
5070		}
5071		}
5072		}
5073		}
5074
5075	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5076	<	extends Traverser<K,V,U> {
5075	>	@SuppressWarnings("serial")
5076	>	static final class SearchMappingsTask<K,V,U>
5077	>	extends BulkTask<K,V,U> {
5078		final BiFun<? super K, ? super V, ? extends U> searchFunction;
5079		final AtomicReference<U> result;
5080		SearchMappingsTask
5081	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5081	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5082		BiFun<? super K, ? super V, ? extends U> searchFunction,
5083		AtomicReference<U> result) {
5084	<	super(m, p, b);
5084	>	super(p, b, i, f, t);
5085		this.searchFunction = searchFunction; this.result = result;
5086		}
5087		public final U getRawResult() { return result.get(); }
5088	<	@SuppressWarnings("unchecked") public final void compute() {
5088	>	public final void compute() {
5089		final BiFun<? super K, ? super V, ? extends U> searchFunction;
5090		final AtomicReference<U> result;
5091	<	if ((searchFunction = this.searchFunction) == null ||
5092	<	(result = this.result) == null)
5093	<	throw new NullPointerException();
5094	<	for (int b;;) {
5095	<	if (result.get() != null)
5096	<	return;
5097	<	if ((b = preSplit()) <= 0)
5098	<	break;
5099	<	new SearchMappingsTask<K,V,U>
5100	<	(map, this, b, searchFunction, result).fork();
5101	<	}
5102	<	while (result.get() == null) {
5103	<	Object v; U u;
5104	<	if ((v = advance()) == null) {
5105	<	propagateCompletion();
5106	<	break;
5107	<	}
5108	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5109	<	if (result.compareAndSet(null, u))
5110	<	quietlyCompleteRoot();
5111	<	break;
5091	>	if ((searchFunction = this.searchFunction) != null &&
5092	>	(result = this.result) != null) {
5093	>	for (int i = baseIndex, f, h; batch > 0 &&
5094	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5095	>	if (result.get() != null)
5096	>	return;
5097	>	addToPendingCount(1);
5098	>	new SearchMappingsTask<K,V,U>
5099	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5100	>	searchFunction, result).fork();
5101	>	}
5102	>	while (result.get() == null) {
5103	>	U u;
5104	>	Node<K,V> p;
5105	>	if ((p = advance()) == null) {
5106	>	propagateCompletion();
5107	>	break;
5108	>	}
5109	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5110	>	if (result.compareAndSet(null, u))
5111	>	quietlyCompleteRoot();
5112	>	break;
5113	>	}
5114		}
5115		}
5116		}
5117		}
5118
5119	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5120	<	extends Traverser<K,V,K> {
5119	>	@SuppressWarnings("serial")
5120	>	static final class ReduceKeysTask<K,V>
5121	>	extends BulkTask<K,V,K> {
5122		final BiFun<? super K, ? super K, ? extends K> reducer;
5123		K result;
5124		ReduceKeysTask<K,V> rights, nextRight;
5125		ReduceKeysTask
5126	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5126	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5127		ReduceKeysTask<K,V> nextRight,
5128		BiFun<? super K, ? super K, ? extends K> reducer) {
5129	<	super(m, p, b); this.nextRight = nextRight;
5129	>	super(p, b, i, f, t); this.nextRight = nextRight;
5130		this.reducer = reducer;
5131		}
5132		public final K getRawResult() { return result; }
5133	<	@SuppressWarnings("unchecked") public final void compute() {
5134	<	final BiFun<? super K, ? super K, ? extends K> reducer =
5135	<	this.reducer;
5136	<	if (reducer == null)
5137	<	throw new NullPointerException();
5138	<	for (int b; (b = preSplit()) > 0;)
5139	<	(rights = new ReduceKeysTask<K,V>
5140	<	(map, this, b, rights, reducer)).fork();
5141	<	K r = null;
5142	<	while (advance() != null) {
5143	<	K u = (K)nextKey;
5144	<	r = (r == null) ? u : reducer.apply(r, u);
5145	<	}
5146	<	result = r;
5147	<	CountedCompleter<?> c;
5148	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5149	<	ReduceKeysTask<K,V>
5150	<	t = (ReduceKeysTask<K,V>)c,
5151	<	s = t.rights;
5152	<	while (s != null) {
5153	<	K tr, sr;
5154	<	if ((sr = s.result) != null)
5155	<	t.result = (((tr = t.result) == null) ? sr :
5156	<	reducer.apply(tr, sr));
5157	<	s = t.rights = s.nextRight;
5133	>	public final void compute() {
5134	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5135	>	if ((reducer = this.reducer) != null) {
5136	>	for (int i = baseIndex, f, h; batch > 0 &&
5137	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5138	>	addToPendingCount(1);
5139	>	(rights = new ReduceKeysTask<K,V>
5140	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5141	>	rights, reducer)).fork();
5142	>	}
5143	>	K r = null;
5144	>	for (Node<K,V> p; (p = advance()) != null; ) {
5145	>	K u = p.key;
5146	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5147	>	}
5148	>	result = r;
5149	>	CountedCompleter<?> c;
5150	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5151	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5152	>	t = (ReduceKeysTask<K,V>)c,
5153	>	s = t.rights;
5154	>	while (s != null) {
5155	>	K tr, sr;
5156	>	if ((sr = s.result) != null)
5157	>	t.result = (((tr = t.result) == null) ? sr :
5158	>	reducer.apply(tr, sr));
5159	>	s = t.rights = s.nextRight;
5160	>	}
5161		}
5162		}
5163		}
5164		}
5165
5166	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5167	<	extends Traverser<K,V,V> {
5166	>	@SuppressWarnings("serial")
5167	>	static final class ReduceValuesTask<K,V>
5168	>	extends BulkTask<K,V,V> {
5169		final BiFun<? super V, ? super V, ? extends V> reducer;
5170		V result;
5171		ReduceValuesTask<K,V> rights, nextRight;
5172		ReduceValuesTask
5173	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5173	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5174		ReduceValuesTask<K,V> nextRight,
5175		BiFun<? super V, ? super V, ? extends V> reducer) {
5176	<	super(m, p, b); this.nextRight = nextRight;
5176	>	super(p, b, i, f, t); this.nextRight = nextRight;
5177		this.reducer = reducer;
5178		}
5179		public final V getRawResult() { return result; }
5180	<	@SuppressWarnings("unchecked") public final void compute() {
5181	<	final BiFun<? super V, ? super V, ? extends V> reducer =
5182	<	this.reducer;
5183	<	if (reducer == null)
5184	<	throw new NullPointerException();
5185	<	for (int b; (b = preSplit()) > 0;)
5186	<	(rights = new ReduceValuesTask<K,V>
5187	<	(map, this, b, rights, reducer)).fork();
5188	<	V r = null;
5189	<	Object v;
5190	<	while ((v = advance()) != null) {
5191	<	V u = (V)v;
5192	<	r = (r == null) ? u : reducer.apply(r, u);
5193	<	}
5194	<	result = r;
5195	<	CountedCompleter<?> c;
5196	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5197	<	ReduceValuesTask<K,V>
5198	<	t = (ReduceValuesTask<K,V>)c,
5199	<	s = t.rights;
5200	<	while (s != null) {
5201	<	V tr, sr;
5202	<	if ((sr = s.result) != null)
5203	<	t.result = (((tr = t.result) == null) ? sr :
5204	<	reducer.apply(tr, sr));
5205	<	s = t.rights = s.nextRight;
5180	>	public final void compute() {
5181	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5182	>	if ((reducer = this.reducer) != null) {
5183	>	for (int i = baseIndex, f, h; batch > 0 &&
5184	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5185	>	addToPendingCount(1);
5186	>	(rights = new ReduceValuesTask<K,V>
5187	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5188	>	rights, reducer)).fork();
5189	>	}
5190	>	V r = null;
5191	>	for (Node<K,V> p; (p = advance()) != null; ) {
5192	>	V v = p.val;
5193	>	r = (r == null) ? v : reducer.apply(r, v);
5194	>	}
5195	>	result = r;
5196	>	CountedCompleter<?> c;
5197	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5198	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5199	>	t = (ReduceValuesTask<K,V>)c,
5200	>	s = t.rights;
5201	>	while (s != null) {
5202	>	V tr, sr;
5203	>	if ((sr = s.result) != null)
5204	>	t.result = (((tr = t.result) == null) ? sr :
5205	>	reducer.apply(tr, sr));
5206	>	s = t.rights = s.nextRight;
5207	>	}
5208		}
5209		}
5210		}
5211		}
5212
5213	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5214	<	extends Traverser<K,V,Map.Entry<K,V>> {
5213	>	@SuppressWarnings("serial")
5214	>	static final class ReduceEntriesTask<K,V>
5215	>	extends BulkTask<K,V,Map.Entry<K,V>> {
5216		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5217		Map.Entry<K,V> result;
5218		ReduceEntriesTask<K,V> rights, nextRight;
5219		ReduceEntriesTask
5220	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5220	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5221		ReduceEntriesTask<K,V> nextRight,
5222		BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5223	<	super(m, p, b); this.nextRight = nextRight;
5223	>	super(p, b, i, f, t); this.nextRight = nextRight;
5224		this.reducer = reducer;
5225		}
5226		public final Map.Entry<K,V> getRawResult() { return result; }
5227	<	@SuppressWarnings("unchecked") public final void compute() {
5228	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5229	<	this.reducer;
5230	<	if (reducer == null)
5231	<	throw new NullPointerException();
5232	<	for (int b; (b = preSplit()) > 0;)
5233	<	(rights = new ReduceEntriesTask<K,V>
5234	<	(map, this, b, rights, reducer)).fork();
5235	<	Map.Entry<K,V> r = null;
5236	<	Object v;
5237	<	while ((v = advance()) != null) {
5238	<	Map.Entry<K,V> u = entryFor((K)nextKey, (V)v);
5239	<	r = (r == null) ? u : reducer.apply(r, u);
5240	<	}
5241	<	result = r;
5242	<	CountedCompleter<?> c;
5243	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5244	<	ReduceEntriesTask<K,V>
5245	<	t = (ReduceEntriesTask<K,V>)c,
5246	<	s = t.rights;
5247	<	while (s != null) {
5248	<	Map.Entry<K,V> tr, sr;
5249	<	if ((sr = s.result) != null)
5250	<	t.result = (((tr = t.result) == null) ? sr :
5251	<	reducer.apply(tr, sr));
5252	<	s = t.rights = s.nextRight;
5227	>	public final void compute() {
5228	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5229	>	if ((reducer = this.reducer) != null) {
5230	>	for (int i = baseIndex, f, h; batch > 0 &&
5231	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5232	>	addToPendingCount(1);
5233	>	(rights = new ReduceEntriesTask<K,V>
5234	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5235	>	rights, reducer)).fork();
5236	>	}
5237	>	Map.Entry<K,V> r = null;
5238	>	for (Node<K,V> p; (p = advance()) != null; )
5239	>	r = (r == null) ? p : reducer.apply(r, p);
5240	>	result = r;
5241	>	CountedCompleter<?> c;
5242	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5243	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5244	>	t = (ReduceEntriesTask<K,V>)c,
5245	>	s = t.rights;
5246	>	while (s != null) {
5247	>	Map.Entry<K,V> tr, sr;
5248	>	if ((sr = s.result) != null)
5249	>	t.result = (((tr = t.result) == null) ? sr :
5250	>	reducer.apply(tr, sr));
5251	>	s = t.rights = s.nextRight;
5252	>	}
5253		}
5254		}
5255		}
5256		}
5257
5258	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5259	<	extends Traverser<K,V,U> {
5258	>	@SuppressWarnings("serial")
5259	>	static final class MapReduceKeysTask<K,V,U>
5260	>	extends BulkTask<K,V,U> {
5261		final Fun<? super K, ? extends U> transformer;
5262		final BiFun<? super U, ? super U, ? extends U> reducer;
5263		U result;
5264		MapReduceKeysTask<K,V,U> rights, nextRight;
5265		MapReduceKeysTask
5266	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5266	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5267		MapReduceKeysTask<K,V,U> nextRight,
5268		Fun<? super K, ? extends U> transformer,
5269		BiFun<? super U, ? super U, ? extends U> reducer) {
5270	<	super(m, p, b); this.nextRight = nextRight;
5270	>	super(p, b, i, f, t); this.nextRight = nextRight;
5271		this.transformer = transformer;
5272		this.reducer = reducer;
5273		}
5274		public final U getRawResult() { return result; }
5275	<	@SuppressWarnings("unchecked") public final void compute() {
5276	<	final Fun<? super K, ? extends U> transformer =
5277	<	this.transformer;
5278	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5279	<	this.reducer;
5280	<	if (transformer == null || reducer == null)
5281	<	throw new NullPointerException();
5282	<	for (int b; (b = preSplit()) > 0;)
5283	<	(rights = new MapReduceKeysTask<K,V,U>
5284	<	(map, this, b, rights, transformer, reducer)).fork();
5285	<	U r = null, u;
5286	<	while (advance() != null) {
5287	<	if ((u = transformer.apply((K)nextKey)) != null)
5288	<	r = (r == null) ? u : reducer.apply(r, u);
5289	<	}
5290	<	result = r;
5291	<	CountedCompleter<?> c;
5292	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5293	<	MapReduceKeysTask<K,V,U>
5294	<	t = (MapReduceKeysTask<K,V,U>)c,
5295	<	s = t.rights;
5296	<	while (s != null) {
5297	<	U tr, sr;
5298	<	if ((sr = s.result) != null)
5299	<	t.result = (((tr = t.result) == null) ? sr :
5300	<	reducer.apply(tr, sr));
5301	<	s = t.rights = s.nextRight;
5275	>	public final void compute() {
5276	>	final Fun<? super K, ? extends U> transformer;
5277	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5278	>	if ((transformer = this.transformer) != null &&
5279	>	(reducer = this.reducer) != null) {
5280	>	for (int i = baseIndex, f, h; batch > 0 &&
5281	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5282	>	addToPendingCount(1);
5283	>	(rights = new MapReduceKeysTask<K,V,U>
5284	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5285	>	rights, transformer, reducer)).fork();
5286	>	}
5287	>	U r = null;
5288	>	for (Node<K,V> p; (p = advance()) != null; ) {
5289	>	U u;
5290	>	if ((u = transformer.apply(p.key)) != null)
5291	>	r = (r == null) ? u : reducer.apply(r, u);
5292	>	}
5293	>	result = r;
5294	>	CountedCompleter<?> c;
5295	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5296	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5297	>	t = (MapReduceKeysTask<K,V,U>)c,
5298	>	s = t.rights;
5299	>	while (s != null) {
5300	>	U tr, sr;
5301	>	if ((sr = s.result) != null)
5302	>	t.result = (((tr = t.result) == null) ? sr :
5303	>	reducer.apply(tr, sr));
5304	>	s = t.rights = s.nextRight;
5305	>	}
5306		}
5307		}
5308		}
5309		}
5310
5311	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5312	<	extends Traverser<K,V,U> {
5311	>	@SuppressWarnings("serial")
5312	>	static final class MapReduceValuesTask<K,V,U>
5313	>	extends BulkTask<K,V,U> {
5314		final Fun<? super V, ? extends U> transformer;
5315		final BiFun<? super U, ? super U, ? extends U> reducer;
5316		U result;
5317		MapReduceValuesTask<K,V,U> rights, nextRight;
5318		MapReduceValuesTask
5319	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5319	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5320		MapReduceValuesTask<K,V,U> nextRight,
5321		Fun<? super V, ? extends U> transformer,
5322		BiFun<? super U, ? super U, ? extends U> reducer) {
5323	<	super(m, p, b); this.nextRight = nextRight;
5323	>	super(p, b, i, f, t); this.nextRight = nextRight;
5324		this.transformer = transformer;
5325		this.reducer = reducer;
5326		}
5327		public final U getRawResult() { return result; }
5328	<	@SuppressWarnings("unchecked") public final void compute() {
5329	<	final Fun<? super V, ? extends U> transformer =
5330	<	this.transformer;
5331	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5332	<	this.reducer;
5333	<	if (transformer == null || reducer == null)
5334	<	throw new NullPointerException();
5335	<	for (int b; (b = preSplit()) > 0;)
5336	<	(rights = new MapReduceValuesTask<K,V,U>
5337	<	(map, this, b, rights, transformer, reducer)).fork();
5338	<	U r = null, u;
5339	<	Object v;
5340	<	while ((v = advance()) != null) {
5341	<	if ((u = transformer.apply((V)v)) != null)
5342	<	r = (r == null) ? u : reducer.apply(r, u);
5343	<	}
5344	<	result = r;
5345	<	CountedCompleter<?> c;
5346	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5347	<	MapReduceValuesTask<K,V,U>
5348	<	t = (MapReduceValuesTask<K,V,U>)c,
5349	<	s = t.rights;
5350	<	while (s != null) {
5351	<	U tr, sr;
5352	<	if ((sr = s.result) != null)
5353	<	t.result = (((tr = t.result) == null) ? sr :
5354	<	reducer.apply(tr, sr));
5355	<	s = t.rights = s.nextRight;
5328	>	public final void compute() {
5329	>	final Fun<? super V, ? extends U> transformer;
5330	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5331	>	if ((transformer = this.transformer) != null &&
5332	>	(reducer = this.reducer) != null) {
5333	>	for (int i = baseIndex, f, h; batch > 0 &&
5334	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5335	>	addToPendingCount(1);
5336	>	(rights = new MapReduceValuesTask<K,V,U>
5337	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5338	>	rights, transformer, reducer)).fork();
5339	>	}
5340	>	U r = null;
5341	>	for (Node<K,V> p; (p = advance()) != null; ) {
5342	>	U u;
5343	>	if ((u = transformer.apply(p.val)) != null)
5344	>	r = (r == null) ? u : reducer.apply(r, u);
5345	>	}
5346	>	result = r;
5347	>	CountedCompleter<?> c;
5348	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5349	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5350	>	t = (MapReduceValuesTask<K,V,U>)c,
5351	>	s = t.rights;
5352	>	while (s != null) {
5353	>	U tr, sr;
5354	>	if ((sr = s.result) != null)
5355	>	t.result = (((tr = t.result) == null) ? sr :
5356	>	reducer.apply(tr, sr));
5357	>	s = t.rights = s.nextRight;
5358	>	}
5359		}
5360		}
5361		}
5362		}
5363
5364	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5365	<	extends Traverser<K,V,U> {
5364	>	@SuppressWarnings("serial")
5365	>	static final class MapReduceEntriesTask<K,V,U>
5366	>	extends BulkTask<K,V,U> {
5367		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5368		final BiFun<? super U, ? super U, ? extends U> reducer;
5369		U result;
5370		MapReduceEntriesTask<K,V,U> rights, nextRight;
5371		MapReduceEntriesTask
5372	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5372	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5373		MapReduceEntriesTask<K,V,U> nextRight,
5374		Fun<Map.Entry<K,V>, ? extends U> transformer,
5375		BiFun<? super U, ? super U, ? extends U> reducer) {
5376	<	super(m, p, b); this.nextRight = nextRight;
5376	>	super(p, b, i, f, t); this.nextRight = nextRight;
5377		this.transformer = transformer;
5378		this.reducer = reducer;
5379		}
5380		public final U getRawResult() { return result; }
5381	<	@SuppressWarnings("unchecked") public final void compute() {
5382	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5383	<	this.transformer;
5384	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5385	<	this.reducer;
5386	<	if (transformer == null || reducer == null)
5387	<	throw new NullPointerException();
5388	<	for (int b; (b = preSplit()) > 0;)
5389	<	(rights = new MapReduceEntriesTask<K,V,U>
5390	<	(map, this, b, rights, transformer, reducer)).fork();
5391	<	U r = null, u;
5392	<	Object v;
5393	<	while ((v = advance()) != null) {
5394	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5395	<	r = (r == null) ? u : reducer.apply(r, u);
5396	<	}
5397	<	result = r;
5398	<	CountedCompleter<?> c;
5399	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5400	<	MapReduceEntriesTask<K,V,U>
5401	<	t = (MapReduceEntriesTask<K,V,U>)c,
5402	<	s = t.rights;
5403	<	while (s != null) {
5404	<	U tr, sr;
5405	<	if ((sr = s.result) != null)
5406	<	t.result = (((tr = t.result) == null) ? sr :
5407	<	reducer.apply(tr, sr));
5408	<	s = t.rights = s.nextRight;
5381	>	public final void compute() {
5382	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5383	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5384	>	if ((transformer = this.transformer) != null &&
5385	>	(reducer = this.reducer) != null) {
5386	>	for (int i = baseIndex, f, h; batch > 0 &&
5387	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5388	>	addToPendingCount(1);
5389	>	(rights = new MapReduceEntriesTask<K,V,U>
5390	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5391	>	rights, transformer, reducer)).fork();
5392	>	}
5393	>	U r = null;
5394	>	for (Node<K,V> p; (p = advance()) != null; ) {
5395	>	U u;
5396	>	if ((u = transformer.apply(p)) != null)
5397	>	r = (r == null) ? u : reducer.apply(r, u);
5398	>	}
5399	>	result = r;
5400	>	CountedCompleter<?> c;
5401	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5402	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5403	>	t = (MapReduceEntriesTask<K,V,U>)c,
5404	>	s = t.rights;
5405	>	while (s != null) {
5406	>	U tr, sr;
5407	>	if ((sr = s.result) != null)
5408	>	t.result = (((tr = t.result) == null) ? sr :
5409	>	reducer.apply(tr, sr));
5410	>	s = t.rights = s.nextRight;
5411	>	}
5412		}
5413		}
5414		}
5415		}
5416
5417	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5418	<	extends Traverser<K,V,U> {
5417	>	@SuppressWarnings("serial")
5418	>	static final class MapReduceMappingsTask<K,V,U>
5419	>	extends BulkTask<K,V,U> {
5420		final BiFun<? super K, ? super V, ? extends U> transformer;
5421		final BiFun<? super U, ? super U, ? extends U> reducer;
5422		U result;
5423		MapReduceMappingsTask<K,V,U> rights, nextRight;
5424		MapReduceMappingsTask
5425	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5425	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5426		MapReduceMappingsTask<K,V,U> nextRight,
5427		BiFun<? super K, ? super V, ? extends U> transformer,
5428		BiFun<? super U, ? super U, ? extends U> reducer) {
5429	<	super(m, p, b); this.nextRight = nextRight;
5429	>	super(p, b, i, f, t); this.nextRight = nextRight;
5430		this.transformer = transformer;
5431		this.reducer = reducer;
5432		}
5433		public final U getRawResult() { return result; }
5434	<	@SuppressWarnings("unchecked") public final void compute() {
5435	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5436	<	this.transformer;
5437	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5438	<	this.reducer;
5439	<	if (transformer == null || reducer == null)
5440	<	throw new NullPointerException();
5441	<	for (int b; (b = preSplit()) > 0;)
5442	<	(rights = new MapReduceMappingsTask<K,V,U>
5443	<	(map, this, b, rights, transformer, reducer)).fork();
5444	<	U r = null, u;
5445	<	Object v;
5446	<	while ((v = advance()) != null) {
5447	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5448	<	r = (r == null) ? u : reducer.apply(r, u);
5449	<	}
5450	<	result = r;
5451	<	CountedCompleter<?> c;
5452	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5453	<	MapReduceMappingsTask<K,V,U>
5454	<	t = (MapReduceMappingsTask<K,V,U>)c,
5455	<	s = t.rights;
5456	<	while (s != null) {
5457	<	U tr, sr;
5458	<	if ((sr = s.result) != null)
5459	<	t.result = (((tr = t.result) == null) ? sr :
5460	<	reducer.apply(tr, sr));
5461	<	s = t.rights = s.nextRight;
5434	>	public final void compute() {
5435	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5436	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5437	>	if ((transformer = this.transformer) != null &&
5438	>	(reducer = this.reducer) != null) {
5439	>	for (int i = baseIndex, f, h; batch > 0 &&
5440	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5441	>	addToPendingCount(1);
5442	>	(rights = new MapReduceMappingsTask<K,V,U>
5443	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5444	>	rights, transformer, reducer)).fork();
5445	>	}
5446	>	U r = null;
5447	>	for (Node<K,V> p; (p = advance()) != null; ) {
5448	>	U u;
5449	>	if ((u = transformer.apply(p.key, p.val)) != null)
5450	>	r = (r == null) ? u : reducer.apply(r, u);
5451	>	}
5452	>	result = r;
5453	>	CountedCompleter<?> c;
5454	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5455	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5456	>	t = (MapReduceMappingsTask<K,V,U>)c,
5457	>	s = t.rights;
5458	>	while (s != null) {
5459	>	U tr, sr;
5460	>	if ((sr = s.result) != null)
5461	>	t.result = (((tr = t.result) == null) ? sr :
5462	>	reducer.apply(tr, sr));
5463	>	s = t.rights = s.nextRight;
5464	>	}
5465		}
5466		}
5467		}
5468		}
5469
5470	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5471	<	extends Traverser<K,V,Double> {
5470	>	@SuppressWarnings("serial")
5471	>	static final class MapReduceKeysToDoubleTask<K,V>
5472	>	extends BulkTask<K,V,Double> {
5473		final ObjectToDouble<? super K> transformer;
5474		final DoubleByDoubleToDouble reducer;
5475		final double basis;
5476		double result;
5477		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5478		MapReduceKeysToDoubleTask
5479	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5479	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5480		MapReduceKeysToDoubleTask<K,V> nextRight,
5481		ObjectToDouble<? super K> transformer,
5482		double basis,
5483		DoubleByDoubleToDouble reducer) {
5484	<	super(m, p, b); this.nextRight = nextRight;
5484	>	super(p, b, i, f, t); this.nextRight = nextRight;
5485		this.transformer = transformer;
5486		this.basis = basis; this.reducer = reducer;
5487		}
5488		public final Double getRawResult() { return result; }
5489	<	@SuppressWarnings("unchecked") public final void compute() {
5490	<	final ObjectToDouble<? super K> transformer =
5491	<	this.transformer;
5492	<	final DoubleByDoubleToDouble reducer = this.reducer;
5493	<	if (transformer == null || reducer == null)
5494	<	throw new NullPointerException();
5495	<	double r = this.basis;
5496	<	for (int b; (b = preSplit()) > 0;)
5497	<	(rights = new MapReduceKeysToDoubleTask<K,V>
5498	<	(map, this, b, rights, transformer, r, reducer)).fork();
5499	<	while (advance() != null)
5500	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5501	<	result = r;
5502	<	CountedCompleter<?> c;
5503	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5504	<	MapReduceKeysToDoubleTask<K,V>
5505	<	t = (MapReduceKeysToDoubleTask<K,V>)c,
5506	<	s = t.rights;
5507	<	while (s != null) {
5508	<	t.result = reducer.apply(t.result, s.result);
5509	<	s = t.rights = s.nextRight;
5489	>	public final void compute() {
5490	>	final ObjectToDouble<? super K> transformer;
5491	>	final DoubleByDoubleToDouble reducer;
5492	>	if ((transformer = this.transformer) != null &&
5493	>	(reducer = this.reducer) != null) {
5494	>	double r = this.basis;
5495	>	for (int i = baseIndex, f, h; batch > 0 &&
5496	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5497	>	addToPendingCount(1);
5498	>	(rights = new MapReduceKeysToDoubleTask<K,V>
5499	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5500	>	rights, transformer, r, reducer)).fork();
5501	>	}
5502	>	for (Node<K,V> p; (p = advance()) != null; )
5503	>	r = reducer.apply(r, transformer.apply(p.key));
5504	>	result = r;
5505	>	CountedCompleter<?> c;
5506	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5507	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5508	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5509	>	s = t.rights;
5510	>	while (s != null) {
5511	>	t.result = reducer.apply(t.result, s.result);
5512	>	s = t.rights = s.nextRight;
5513	>	}
5514		}
5515		}
5516		}
5517		}
5518
5519	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5520	<	extends Traverser<K,V,Double> {
5519	>	@SuppressWarnings("serial")
5520	>	static final class MapReduceValuesToDoubleTask<K,V>
5521	>	extends BulkTask<K,V,Double> {
5522		final ObjectToDouble<? super V> transformer;
5523		final DoubleByDoubleToDouble reducer;
5524		final double basis;
5525		double result;
5526		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5527		MapReduceValuesToDoubleTask
5528	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5528	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5529		MapReduceValuesToDoubleTask<K,V> nextRight,
5530		ObjectToDouble<? super V> transformer,
5531		double basis,
5532		DoubleByDoubleToDouble reducer) {
5533	<	super(m, p, b); this.nextRight = nextRight;
5533	>	super(p, b, i, f, t); this.nextRight = nextRight;
5534		this.transformer = transformer;
5535		this.basis = basis; this.reducer = reducer;
5536		}
5537		public final Double getRawResult() { return result; }
5538	<	@SuppressWarnings("unchecked") public final void compute() {
5539	<	final ObjectToDouble<? super V> transformer =
5540	<	this.transformer;
5541	<	final DoubleByDoubleToDouble reducer = this.reducer;
5542	<	if (transformer == null || reducer == null)
5543	<	throw new NullPointerException();
5544	<	double r = this.basis;
5545	<	for (int b; (b = preSplit()) > 0;)
5546	<	(rights = new MapReduceValuesToDoubleTask<K,V>
5547	<	(map, this, b, rights, transformer, r, reducer)).fork();
5548	<	Object v;
5549	<	while ((v = advance()) != null)
5550	<	r = reducer.apply(r, transformer.apply((V)v));
5551	<	result = r;
5552	<	CountedCompleter<?> c;
5553	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5554	<	MapReduceValuesToDoubleTask<K,V>
5555	<	t = (MapReduceValuesToDoubleTask<K,V>)c,
5556	<	s = t.rights;
5557	<	while (s != null) {
5558	<	t.result = reducer.apply(t.result, s.result);
5559	<	s = t.rights = s.nextRight;
5538	>	public final void compute() {
5539	>	final ObjectToDouble<? super V> transformer;
5540	>	final DoubleByDoubleToDouble reducer;
5541	>	if ((transformer = this.transformer) != null &&
5542	>	(reducer = this.reducer) != null) {
5543	>	double r = this.basis;
5544	>	for (int i = baseIndex, f, h; batch > 0 &&
5545	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5546	>	addToPendingCount(1);
5547	>	(rights = new MapReduceValuesToDoubleTask<K,V>
5548	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5549	>	rights, transformer, r, reducer)).fork();
5550	>	}
5551	>	for (Node<K,V> p; (p = advance()) != null; )
5552	>	r = reducer.apply(r, transformer.apply(p.val));
5553	>	result = r;
5554	>	CountedCompleter<?> c;
5555	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5556	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5557	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5558	>	s = t.rights;
5559	>	while (s != null) {
5560	>	t.result = reducer.apply(t.result, s.result);
5561	>	s = t.rights = s.nextRight;
5562	>	}
5563		}
5564		}
5565		}
5566		}
5567
5568	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5569	<	extends Traverser<K,V,Double> {
5568	>	@SuppressWarnings("serial")
5569	>	static final class MapReduceEntriesToDoubleTask<K,V>
5570	>	extends BulkTask<K,V,Double> {
5571		final ObjectToDouble<Map.Entry<K,V>> transformer;
5572		final DoubleByDoubleToDouble reducer;
5573		final double basis;
5574		double result;
5575		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5576		MapReduceEntriesToDoubleTask
5577	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5577	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5578		MapReduceEntriesToDoubleTask<K,V> nextRight,
5579		ObjectToDouble<Map.Entry<K,V>> transformer,
5580		double basis,
5581		DoubleByDoubleToDouble reducer) {
5582	<	super(m, p, b); this.nextRight = nextRight;
5582	>	super(p, b, i, f, t); this.nextRight = nextRight;
5583		this.transformer = transformer;
5584		this.basis = basis; this.reducer = reducer;
5585		}
5586		public final Double getRawResult() { return result; }
5587	<	@SuppressWarnings("unchecked") public final void compute() {
5588	<	final ObjectToDouble<Map.Entry<K,V>> transformer =
5589	<	this.transformer;
5590	<	final DoubleByDoubleToDouble reducer = this.reducer;
5591	<	if (transformer == null || reducer == null)
5592	<	throw new NullPointerException();
5593	<	double r = this.basis;
5594	<	for (int b; (b = preSplit()) > 0;)
5595	<	(rights = new MapReduceEntriesToDoubleTask<K,V>
5596	<	(map, this, b, rights, transformer, r, reducer)).fork();
5597	<	Object v;
5598	<	while ((v = advance()) != null)
5599	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5600	<	result = r;
5601	<	CountedCompleter<?> c;
5602	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5603	<	MapReduceEntriesToDoubleTask<K,V>
5604	<	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5605	<	s = t.rights;
5606	<	while (s != null) {
5607	<	t.result = reducer.apply(t.result, s.result);
5608	<	s = t.rights = s.nextRight;
5587	>	public final void compute() {
5588	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
5589	>	final DoubleByDoubleToDouble reducer;
5590	>	if ((transformer = this.transformer) != null &&
5591	>	(reducer = this.reducer) != null) {
5592	>	double r = this.basis;
5593	>	for (int i = baseIndex, f, h; batch > 0 &&
5594	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5595	>	addToPendingCount(1);
5596	>	(rights = new MapReduceEntriesToDoubleTask<K,V>
5597	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5598	>	rights, transformer, r, reducer)).fork();
5599	>	}
5600	>	for (Node<K,V> p; (p = advance()) != null; )
5601	>	r = reducer.apply(r, transformer.apply(p));
5602	>	result = r;
5603	>	CountedCompleter<?> c;
5604	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5605	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5606	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5607	>	s = t.rights;
5608	>	while (s != null) {
5609	>	t.result = reducer.apply(t.result, s.result);
5610	>	s = t.rights = s.nextRight;
5611	>	}
5612		}
5613		}
5614		}
5615		}
5616
5617	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5618	<	extends Traverser<K,V,Double> {
5617	>	@SuppressWarnings("serial")
5618	>	static final class MapReduceMappingsToDoubleTask<K,V>
5619	>	extends BulkTask<K,V,Double> {
5620		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5621		final DoubleByDoubleToDouble reducer;
5622		final double basis;
5623		double result;
5624		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5625		MapReduceMappingsToDoubleTask
5626	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5626	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5627		MapReduceMappingsToDoubleTask<K,V> nextRight,
5628		ObjectByObjectToDouble<? super K, ? super V> transformer,
5629		double basis,
5630		DoubleByDoubleToDouble reducer) {
5631	<	super(m, p, b); this.nextRight = nextRight;
5631	>	super(p, b, i, f, t); this.nextRight = nextRight;
5632		this.transformer = transformer;
5633		this.basis = basis; this.reducer = reducer;
5634		}
5635		public final Double getRawResult() { return result; }
5636	<	@SuppressWarnings("unchecked") public final void compute() {
5637	<	final ObjectByObjectToDouble<? super K, ? super V> transformer =
5638	<	this.transformer;
5639	<	final DoubleByDoubleToDouble reducer = this.reducer;
5640	<	if (transformer == null || reducer == null)
5641	<	throw new NullPointerException();
5642	<	double r = this.basis;
5643	<	for (int b; (b = preSplit()) > 0;)
5644	<	(rights = new MapReduceMappingsToDoubleTask<K,V>
5645	<	(map, this, b, rights, transformer, r, reducer)).fork();
5646	<	Object v;
5647	<	while ((v = advance()) != null)
5648	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5649	<	result = r;
5650	<	CountedCompleter<?> c;
5651	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5652	<	MapReduceMappingsToDoubleTask<K,V>
5653	<	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5654	<	s = t.rights;
5655	<	while (s != null) {
5656	<	t.result = reducer.apply(t.result, s.result);
5657	<	s = t.rights = s.nextRight;
5636	>	public final void compute() {
5637	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5638	>	final DoubleByDoubleToDouble reducer;
5639	>	if ((transformer = this.transformer) != null &&
5640	>	(reducer = this.reducer) != null) {
5641	>	double r = this.basis;
5642	>	for (int i = baseIndex, f, h; batch > 0 &&
5643	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5644	>	addToPendingCount(1);
5645	>	(rights = new MapReduceMappingsToDoubleTask<K,V>
5646	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5647	>	rights, transformer, r, reducer)).fork();
5648	>	}
5649	>	for (Node<K,V> p; (p = advance()) != null; )
5650	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5651	>	result = r;
5652	>	CountedCompleter<?> c;
5653	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5654	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5655	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5656	>	s = t.rights;
5657	>	while (s != null) {
5658	>	t.result = reducer.apply(t.result, s.result);
5659	>	s = t.rights = s.nextRight;
5660	>	}
5661		}
5662		}
5663		}
5664		}
5665
5666	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5667	<	extends Traverser<K,V,Long> {
5666	>	@SuppressWarnings("serial")
5667	>	static final class MapReduceKeysToLongTask<K,V>
5668	>	extends BulkTask<K,V,Long> {
5669		final ObjectToLong<? super K> transformer;
5670		final LongByLongToLong reducer;
5671		final long basis;
5672		long result;
5673		MapReduceKeysToLongTask<K,V> rights, nextRight;
5674		MapReduceKeysToLongTask
5675	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5675	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5676		MapReduceKeysToLongTask<K,V> nextRight,
5677		ObjectToLong<? super K> transformer,
5678		long basis,
5679		LongByLongToLong reducer) {
5680	<	super(m, p, b); this.nextRight = nextRight;
5680	>	super(p, b, i, f, t); this.nextRight = nextRight;
5681		this.transformer = transformer;
5682		this.basis = basis; this.reducer = reducer;
5683		}
5684		public final Long getRawResult() { return result; }
5685	<	@SuppressWarnings("unchecked") public final void compute() {
5686	<	final ObjectToLong<? super K> transformer =
5687	<	this.transformer;
5688	<	final LongByLongToLong reducer = this.reducer;
5689	<	if (transformer == null || reducer == null)
5690	<	throw new NullPointerException();
5691	<	long r = this.basis;
5692	<	for (int b; (b = preSplit()) > 0;)
5693	<	(rights = new MapReduceKeysToLongTask<K,V>
5694	<	(map, this, b, rights, transformer, r, reducer)).fork();
5695	<	while (advance() != null)
5696	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5697	<	result = r;
5698	<	CountedCompleter<?> c;
5699	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5700	<	MapReduceKeysToLongTask<K,V>
5701	<	t = (MapReduceKeysToLongTask<K,V>)c,
5702	<	s = t.rights;
5703	<	while (s != null) {
5704	<	t.result = reducer.apply(t.result, s.result);
5705	<	s = t.rights = s.nextRight;
5685	>	public final void compute() {
5686	>	final ObjectToLong<? super K> transformer;
5687	>	final LongByLongToLong reducer;
5688	>	if ((transformer = this.transformer) != null &&
5689	>	(reducer = this.reducer) != null) {
5690	>	long r = this.basis;
5691	>	for (int i = baseIndex, f, h; batch > 0 &&
5692	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5693	>	addToPendingCount(1);
5694	>	(rights = new MapReduceKeysToLongTask<K,V>
5695	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5696	>	rights, transformer, r, reducer)).fork();
5697	>	}
5698	>	for (Node<K,V> p; (p = advance()) != null; )
5699	>	r = reducer.apply(r, transformer.apply(p.key));
5700	>	result = r;
5701	>	CountedCompleter<?> c;
5702	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5703	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5704	>	t = (MapReduceKeysToLongTask<K,V>)c,
5705	>	s = t.rights;
5706	>	while (s != null) {
5707	>	t.result = reducer.apply(t.result, s.result);
5708	>	s = t.rights = s.nextRight;
5709	>	}
5710		}
5711		}
5712		}
5713		}
5714
5715	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5716	<	extends Traverser<K,V,Long> {
5715	>	@SuppressWarnings("serial")
5716	>	static final class MapReduceValuesToLongTask<K,V>
5717	>	extends BulkTask<K,V,Long> {
5718		final ObjectToLong<? super V> transformer;
5719		final LongByLongToLong reducer;
5720		final long basis;
5721		long result;
5722		MapReduceValuesToLongTask<K,V> rights, nextRight;
5723		MapReduceValuesToLongTask
5724	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5724	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5725		MapReduceValuesToLongTask<K,V> nextRight,
5726		ObjectToLong<? super V> transformer,
5727		long basis,
5728		LongByLongToLong reducer) {
5729	<	super(m, p, b); this.nextRight = nextRight;
5729	>	super(p, b, i, f, t); this.nextRight = nextRight;
5730		this.transformer = transformer;
5731		this.basis = basis; this.reducer = reducer;
5732		}
5733		public final Long getRawResult() { return result; }
5734	<	@SuppressWarnings("unchecked") public final void compute() {
5735	<	final ObjectToLong<? super V> transformer =
5736	<	this.transformer;
5737	<	final LongByLongToLong reducer = this.reducer;
5738	<	if (transformer == null || reducer == null)
5739	<	throw new NullPointerException();
5740	<	long r = this.basis;
5741	<	for (int b; (b = preSplit()) > 0;)
5742	<	(rights = new MapReduceValuesToLongTask<K,V>
5743	<	(map, this, b, rights, transformer, r, reducer)).fork();
5744	<	Object v;
5745	<	while ((v = advance()) != null)
5746	<	r = reducer.apply(r, transformer.apply((V)v));
5747	<	result = r;
5748	<	CountedCompleter<?> c;
5749	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5750	<	MapReduceValuesToLongTask<K,V>
5751	<	t = (MapReduceValuesToLongTask<K,V>)c,
5752	<	s = t.rights;
5753	<	while (s != null) {
5754	<	t.result = reducer.apply(t.result, s.result);
5755	<	s = t.rights = s.nextRight;
5734	>	public final void compute() {
5735	>	final ObjectToLong<? super V> transformer;
5736	>	final LongByLongToLong reducer;
5737	>	if ((transformer = this.transformer) != null &&
5738	>	(reducer = this.reducer) != null) {
5739	>	long r = this.basis;
5740	>	for (int i = baseIndex, f, h; batch > 0 &&
5741	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5742	>	addToPendingCount(1);
5743	>	(rights = new MapReduceValuesToLongTask<K,V>
5744	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5745	>	rights, transformer, r, reducer)).fork();
5746	>	}
5747	>	for (Node<K,V> p; (p = advance()) != null; )
5748	>	r = reducer.apply(r, transformer.apply(p.val));
5749	>	result = r;
5750	>	CountedCompleter<?> c;
5751	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5752	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5753	>	t = (MapReduceValuesToLongTask<K,V>)c,
5754	>	s = t.rights;
5755	>	while (s != null) {
5756	>	t.result = reducer.apply(t.result, s.result);
5757	>	s = t.rights = s.nextRight;
5758	>	}
5759		}
5760		}
5761		}
5762		}
5763
5764	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5765	<	extends Traverser<K,V,Long> {
5764	>	@SuppressWarnings("serial")
5765	>	static final class MapReduceEntriesToLongTask<K,V>
5766	>	extends BulkTask<K,V,Long> {
5767		final ObjectToLong<Map.Entry<K,V>> transformer;
5768		final LongByLongToLong reducer;
5769		final long basis;
5770		long result;
5771		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5772		MapReduceEntriesToLongTask
5773	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5773	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5774		MapReduceEntriesToLongTask<K,V> nextRight,
5775		ObjectToLong<Map.Entry<K,V>> transformer,
5776		long basis,
5777		LongByLongToLong reducer) {
5778	<	super(m, p, b); this.nextRight = nextRight;
5778	>	super(p, b, i, f, t); this.nextRight = nextRight;
5779		this.transformer = transformer;
5780		this.basis = basis; this.reducer = reducer;
5781		}
5782		public final Long getRawResult() { return result; }
5783	<	@SuppressWarnings("unchecked") public final void compute() {
5784	<	final ObjectToLong<Map.Entry<K,V>> transformer =
5785	<	this.transformer;
5786	<	final LongByLongToLong reducer = this.reducer;
5787	<	if (transformer == null || reducer == null)
5788	<	throw new NullPointerException();
5789	<	long r = this.basis;
5790	<	for (int b; (b = preSplit()) > 0;)
5791	<	(rights = new MapReduceEntriesToLongTask<K,V>
5792	<	(map, this, b, rights, transformer, r, reducer)).fork();
5793	<	Object v;
5794	<	while ((v = advance()) != null)
5795	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5796	<	result = r;
5797	<	CountedCompleter<?> c;
5798	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5799	<	MapReduceEntriesToLongTask<K,V>
5800	<	t = (MapReduceEntriesToLongTask<K,V>)c,
5801	<	s = t.rights;
5802	<	while (s != null) {
5803	<	t.result = reducer.apply(t.result, s.result);
5804	<	s = t.rights = s.nextRight;
5783	>	public final void compute() {
5784	>	final ObjectToLong<Map.Entry<K,V>> transformer;
5785	>	final LongByLongToLong reducer;
5786	>	if ((transformer = this.transformer) != null &&
5787	>	(reducer = this.reducer) != null) {
5788	>	long r = this.basis;
5789	>	for (int i = baseIndex, f, h; batch > 0 &&
5790	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5791	>	addToPendingCount(1);
5792	>	(rights = new MapReduceEntriesToLongTask<K,V>
5793	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5794	>	rights, transformer, r, reducer)).fork();
5795	>	}
5796	>	for (Node<K,V> p; (p = advance()) != null; )
5797	>	r = reducer.apply(r, transformer.apply(p));
5798	>	result = r;
5799	>	CountedCompleter<?> c;
5800	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5801	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5802	>	t = (MapReduceEntriesToLongTask<K,V>)c,
5803	>	s = t.rights;
5804	>	while (s != null) {
5805	>	t.result = reducer.apply(t.result, s.result);
5806	>	s = t.rights = s.nextRight;
5807	>	}
5808		}
5809		}
5810		}
5811		}
5812
5813	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5814	<	extends Traverser<K,V,Long> {
5813	>	@SuppressWarnings("serial")
5814	>	static final class MapReduceMappingsToLongTask<K,V>
5815	>	extends BulkTask<K,V,Long> {
5816		final ObjectByObjectToLong<? super K, ? super V> transformer;
5817		final LongByLongToLong reducer;
5818		final long basis;
5819		long result;
5820		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5821		MapReduceMappingsToLongTask
5822	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5822	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5823		MapReduceMappingsToLongTask<K,V> nextRight,
5824		ObjectByObjectToLong<? super K, ? super V> transformer,
5825		long basis,
5826		LongByLongToLong reducer) {
5827	<	super(m, p, b); this.nextRight = nextRight;
5827	>	super(p, b, i, f, t); this.nextRight = nextRight;
5828		this.transformer = transformer;
5829		this.basis = basis; this.reducer = reducer;
5830		}
5831		public final Long getRawResult() { return result; }
5832	<	@SuppressWarnings("unchecked") public final void compute() {
5833	<	final ObjectByObjectToLong<? super K, ? super V> transformer =
5834	<	this.transformer;
5835	<	final LongByLongToLong reducer = this.reducer;
5836	<	if (transformer == null || reducer == null)
5837	<	throw new NullPointerException();
5838	<	long r = this.basis;
5839	<	for (int b; (b = preSplit()) > 0;)
5840	<	(rights = new MapReduceMappingsToLongTask<K,V>
5841	<	(map, this, b, rights, transformer, r, reducer)).fork();
5842	<	Object v;
5843	<	while ((v = advance()) != null)
5844	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5845	<	result = r;
5846	<	CountedCompleter<?> c;
5847	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5848	<	MapReduceMappingsToLongTask<K,V>
5849	<	t = (MapReduceMappingsToLongTask<K,V>)c,
5850	<	s = t.rights;
5851	<	while (s != null) {
5852	<	t.result = reducer.apply(t.result, s.result);
5853	<	s = t.rights = s.nextRight;
5832	>	public final void compute() {
5833	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
5834	>	final LongByLongToLong reducer;
5835	>	if ((transformer = this.transformer) != null &&
5836	>	(reducer = this.reducer) != null) {
5837	>	long r = this.basis;
5838	>	for (int i = baseIndex, f, h; batch > 0 &&
5839	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5840	>	addToPendingCount(1);
5841	>	(rights = new MapReduceMappingsToLongTask<K,V>
5842	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5843	>	rights, transformer, r, reducer)).fork();
5844	>	}
5845	>	for (Node<K,V> p; (p = advance()) != null; )
5846	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5847	>	result = r;
5848	>	CountedCompleter<?> c;
5849	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5850	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5851	>	t = (MapReduceMappingsToLongTask<K,V>)c,
5852	>	s = t.rights;
5853	>	while (s != null) {
5854	>	t.result = reducer.apply(t.result, s.result);
5855	>	s = t.rights = s.nextRight;
5856	>	}
5857		}
5858		}
5859		}
5860		}
5861
5862	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5863	<	extends Traverser<K,V,Integer> {
5862	>	@SuppressWarnings("serial")
5863	>	static final class MapReduceKeysToIntTask<K,V>
5864	>	extends BulkTask<K,V,Integer> {
5865		final ObjectToInt<? super K> transformer;
5866		final IntByIntToInt reducer;
5867		final int basis;
5868		int result;
5869		MapReduceKeysToIntTask<K,V> rights, nextRight;
5870		MapReduceKeysToIntTask
5871	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5871	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5872		MapReduceKeysToIntTask<K,V> nextRight,
5873		ObjectToInt<? super K> transformer,
5874		int basis,
5875		IntByIntToInt reducer) {
5876	<	super(m, p, b); this.nextRight = nextRight;
5876	>	super(p, b, i, f, t); this.nextRight = nextRight;
5877		this.transformer = transformer;
5878		this.basis = basis; this.reducer = reducer;
5879		}
5880		public final Integer getRawResult() { return result; }
5881	<	@SuppressWarnings("unchecked") public final void compute() {
5882	<	final ObjectToInt<? super K> transformer =
5883	<	this.transformer;
5884	<	final IntByIntToInt reducer = this.reducer;
5885	<	if (transformer == null || reducer == null)
5886	<	throw new NullPointerException();
5887	<	int r = this.basis;
5888	<	for (int b; (b = preSplit()) > 0;)
5889	<	(rights = new MapReduceKeysToIntTask<K,V>
5890	<	(map, this, b, rights, transformer, r, reducer)).fork();
5891	<	while (advance() != null)
5892	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5893	<	result = r;
5894	<	CountedCompleter<?> c;
5895	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5896	<	MapReduceKeysToIntTask<K,V>
5897	<	t = (MapReduceKeysToIntTask<K,V>)c,
5898	<	s = t.rights;
5899	<	while (s != null) {
5900	<	t.result = reducer.apply(t.result, s.result);
5901	<	s = t.rights = s.nextRight;
5881	>	public final void compute() {
5882	>	final ObjectToInt<? super K> transformer;
5883	>	final IntByIntToInt reducer;
5884	>	if ((transformer = this.transformer) != null &&
5885	>	(reducer = this.reducer) != null) {
5886	>	int r = this.basis;
5887	>	for (int i = baseIndex, f, h; batch > 0 &&
5888	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5889	>	addToPendingCount(1);
5890	>	(rights = new MapReduceKeysToIntTask<K,V>
5891	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5892	>	rights, transformer, r, reducer)).fork();
5893	>	}
5894	>	for (Node<K,V> p; (p = advance()) != null; )
5895	>	r = reducer.apply(r, transformer.apply(p.key));
5896	>	result = r;
5897	>	CountedCompleter<?> c;
5898	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5899	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5900	>	t = (MapReduceKeysToIntTask<K,V>)c,
5901	>	s = t.rights;
5902	>	while (s != null) {
5903	>	t.result = reducer.apply(t.result, s.result);
5904	>	s = t.rights = s.nextRight;
5905	>	}
5906		}
5907		}
5908		}
5909		}
5910
5911	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5912	<	extends Traverser<K,V,Integer> {
5911	>	@SuppressWarnings("serial")
5912	>	static final class MapReduceValuesToIntTask<K,V>
5913	>	extends BulkTask<K,V,Integer> {
5914		final ObjectToInt<? super V> transformer;
5915		final IntByIntToInt reducer;
5916		final int basis;
5917		int result;
5918		MapReduceValuesToIntTask<K,V> rights, nextRight;
5919		MapReduceValuesToIntTask
5920	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5920	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5921		MapReduceValuesToIntTask<K,V> nextRight,
5922		ObjectToInt<? super V> transformer,
5923		int basis,
5924		IntByIntToInt reducer) {
5925	<	super(m, p, b); this.nextRight = nextRight;
5925	>	super(p, b, i, f, t); this.nextRight = nextRight;
5926		this.transformer = transformer;
5927		this.basis = basis; this.reducer = reducer;
5928		}
5929		public final Integer getRawResult() { return result; }
5930	<	@SuppressWarnings("unchecked") public final void compute() {
5931	<	final ObjectToInt<? super V> transformer =
5932	<	this.transformer;
5933	<	final IntByIntToInt reducer = this.reducer;
5934	<	if (transformer == null || reducer == null)
5935	<	throw new NullPointerException();
5936	<	int r = this.basis;
5937	<	for (int b; (b = preSplit()) > 0;)
5938	<	(rights = new MapReduceValuesToIntTask<K,V>
5939	<	(map, this, b, rights, transformer, r, reducer)).fork();
5940	<	Object v;
5941	<	while ((v = advance()) != null)
5942	<	r = reducer.apply(r, transformer.apply((V)v));
5943	<	result = r;
5944	<	CountedCompleter<?> c;
5945	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5946	<	MapReduceValuesToIntTask<K,V>
5947	<	t = (MapReduceValuesToIntTask<K,V>)c,
5948	<	s = t.rights;
5949	<	while (s != null) {
5950	<	t.result = reducer.apply(t.result, s.result);
5951	<	s = t.rights = s.nextRight;
5930	>	public final void compute() {
5931	>	final ObjectToInt<? super V> transformer;
5932	>	final IntByIntToInt reducer;
5933	>	if ((transformer = this.transformer) != null &&
5934	>	(reducer = this.reducer) != null) {
5935	>	int r = this.basis;
5936	>	for (int i = baseIndex, f, h; batch > 0 &&
5937	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5938	>	addToPendingCount(1);
5939	>	(rights = new MapReduceValuesToIntTask<K,V>
5940	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5941	>	rights, transformer, r, reducer)).fork();
5942	>	}
5943	>	for (Node<K,V> p; (p = advance()) != null; )
5944	>	r = reducer.apply(r, transformer.apply(p.val));
5945	>	result = r;
5946	>	CountedCompleter<?> c;
5947	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5948	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5949	>	t = (MapReduceValuesToIntTask<K,V>)c,
5950	>	s = t.rights;
5951	>	while (s != null) {
5952	>	t.result = reducer.apply(t.result, s.result);
5953	>	s = t.rights = s.nextRight;
5954	>	}
5955		}
5956		}
5957		}
5958		}
5959
5960	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
5961	<	extends Traverser<K,V,Integer> {
5960	>	@SuppressWarnings("serial")
5961	>	static final class MapReduceEntriesToIntTask<K,V>
5962	>	extends BulkTask<K,V,Integer> {
5963		final ObjectToInt<Map.Entry<K,V>> transformer;
5964		final IntByIntToInt reducer;
5965		final int basis;
5966		int result;
5967		MapReduceEntriesToIntTask<K,V> rights, nextRight;
5968		MapReduceEntriesToIntTask
5969	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5969	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5970		MapReduceEntriesToIntTask<K,V> nextRight,
5971		ObjectToInt<Map.Entry<K,V>> transformer,
5972		int basis,
5973		IntByIntToInt reducer) {
5974	<	super(m, p, b); this.nextRight = nextRight;
5974	>	super(p, b, i, f, t); this.nextRight = nextRight;
5975		this.transformer = transformer;
5976		this.basis = basis; this.reducer = reducer;
5977		}
5978		public final Integer getRawResult() { return result; }
5979	<	@SuppressWarnings("unchecked") public final void compute() {
5980	<	final ObjectToInt<Map.Entry<K,V>> transformer =
5981	<	this.transformer;
5982	<	final IntByIntToInt reducer = this.reducer;
5983	<	if (transformer == null || reducer == null)
5984	<	throw new NullPointerException();
5985	<	int r = this.basis;
5986	<	for (int b; (b = preSplit()) > 0;)
5987	<	(rights = new MapReduceEntriesToIntTask<K,V>
5988	<	(map, this, b, rights, transformer, r, reducer)).fork();
5989	<	Object v;
5990	<	while ((v = advance()) != null)
5991	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5992	<	result = r;
5993	<	CountedCompleter<?> c;
5994	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5995	<	MapReduceEntriesToIntTask<K,V>
5996	<	t = (MapReduceEntriesToIntTask<K,V>)c,
5997	<	s = t.rights;
5998	<	while (s != null) {
5999	<	t.result = reducer.apply(t.result, s.result);
6000	<	s = t.rights = s.nextRight;
5979	>	public final void compute() {
5980	>	final ObjectToInt<Map.Entry<K,V>> transformer;
5981	>	final IntByIntToInt reducer;
5982	>	if ((transformer = this.transformer) != null &&
5983	>	(reducer = this.reducer) != null) {
5984	>	int r = this.basis;
5985	>	for (int i = baseIndex, f, h; batch > 0 &&
5986	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5987	>	addToPendingCount(1);
5988	>	(rights = new MapReduceEntriesToIntTask<K,V>
5989	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5990	>	rights, transformer, r, reducer)).fork();
5991	>	}
5992	>	for (Node<K,V> p; (p = advance()) != null; )
5993	>	r = reducer.apply(r, transformer.apply(p));
5994	>	result = r;
5995	>	CountedCompleter<?> c;
5996	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5997	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
5998	>	t = (MapReduceEntriesToIntTask<K,V>)c,
5999	>	s = t.rights;
6000	>	while (s != null) {
6001	>	t.result = reducer.apply(t.result, s.result);
6002	>	s = t.rights = s.nextRight;
6003	>	}
6004		}
6005		}
6006		}
6007		}
6008
6009	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
6010	<	extends Traverser<K,V,Integer> {
6009	>	@SuppressWarnings("serial")
6010	>	static final class MapReduceMappingsToIntTask<K,V>
6011	>	extends BulkTask<K,V,Integer> {
6012		final ObjectByObjectToInt<? super K, ? super V> transformer;
6013		final IntByIntToInt reducer;
6014		final int basis;
6015		int result;
6016		MapReduceMappingsToIntTask<K,V> rights, nextRight;
6017		MapReduceMappingsToIntTask
6018	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6018	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6019		MapReduceMappingsToIntTask<K,V> nextRight,
6020		ObjectByObjectToInt<? super K, ? super V> transformer,
6021		int basis,
6022		IntByIntToInt reducer) {
6023	<	super(m, p, b); this.nextRight = nextRight;
6023	>	super(p, b, i, f, t); this.nextRight = nextRight;
6024		this.transformer = transformer;
6025		this.basis = basis; this.reducer = reducer;
6026		}
6027		public final Integer getRawResult() { return result; }
6028	<	@SuppressWarnings("unchecked") public final void compute() {
6029	<	final ObjectByObjectToInt<? super K, ? super V> transformer =
6030	<	this.transformer;
6031	<	final IntByIntToInt reducer = this.reducer;
6032	<	if (transformer == null || reducer == null)
6033	<	throw new NullPointerException();
6034	<	int r = this.basis;
6035	<	for (int b; (b = preSplit()) > 0;)
6036	<	(rights = new MapReduceMappingsToIntTask<K,V>
6037	<	(map, this, b, rights, transformer, r, reducer)).fork();
6038	<	Object v;
6039	<	while ((v = advance()) != null)
6040	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
6041	<	result = r;
6042	<	CountedCompleter<?> c;
6043	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6044	<	MapReduceMappingsToIntTask<K,V>
6045	<	t = (MapReduceMappingsToIntTask<K,V>)c,
6046	<	s = t.rights;
6047	<	while (s != null) {
6048	<	t.result = reducer.apply(t.result, s.result);
6049	<	s = t.rights = s.nextRight;
6028	>	public final void compute() {
6029	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
6030	>	final IntByIntToInt reducer;
6031	>	if ((transformer = this.transformer) != null &&
6032	>	(reducer = this.reducer) != null) {
6033	>	int r = this.basis;
6034	>	for (int i = baseIndex, f, h; batch > 0 &&
6035	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6036	>	addToPendingCount(1);
6037	>	(rights = new MapReduceMappingsToIntTask<K,V>
6038	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6039	>	rights, transformer, r, reducer)).fork();
6040	>	}
6041	>	for (Node<K,V> p; (p = advance()) != null; )
6042	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
6043	>	result = r;
6044	>	CountedCompleter<?> c;
6045	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6046	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
6047	>	t = (MapReduceMappingsToIntTask<K,V>)c,
6048	>	s = t.rights;
6049	>	while (s != null) {
6050	>	t.result = reducer.apply(t.result, s.result);
6051	>	s = t.rights = s.nextRight;
6052	>	}
6053	>	}
6054	>	}
6055	>	}
6056	>	}
6057	>
6058	>	/* ---------------- Counters -------------- */
6059	>
6060	>	// Adapted from LongAdder and Striped64.
6061	>	// See their internal docs for explanation.
6062	>
6063	>	// A padded cell for distributing counts
6064	>	static final class CounterCell {
6065	>	volatile long p0, p1, p2, p3, p4, p5, p6;
6066	>	volatile long value;
6067	>	volatile long q0, q1, q2, q3, q4, q5, q6;
6068	>	CounterCell(long x) { value = x; }
6069	>	}
6070	>
6071	>	/**
6072	>	* Holder for the thread-local hash code determining which
6073	>	* CounterCell to use. The code is initialized via the
6074	>	* counterHashCodeGenerator, but may be moved upon collisions.
6075	>	*/
6076	>	static final class CounterHashCode {
6077	>	int code;
6078	>	}
6079	>
6080	>	/**
6081	>	* Generates initial value for per-thread CounterHashCodes.
6082	>	*/
6083	>	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
6084	>
6085	>	/**
6086	>	* Increment for counterHashCodeGenerator. See class ThreadLocal
6087	>	* for explanation.
6088	>	*/
6089	>	static final int SEED_INCREMENT = 0x61c88647;
6090	>
6091	>	/**
6092	>	* Per-thread counter hash codes. Shared across all instances.
6093	>	*/
6094	>	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
6095	>	new ThreadLocal<CounterHashCode>();
6096	>
6097	>
6098	>	final long sumCount() {
6099	>	CounterCell[] as = counterCells; CounterCell a;
6100	>	long sum = baseCount;
6101	>	if (as != null) {
6102	>	for (int i = 0; i < as.length; ++i) {
6103	>	if ((a = as[i]) != null)
6104	>	sum += a.value;
6105	>	}
6106	>	}
6107	>	return sum;
6108	>	}
6109	>
6110	>	// See LongAdder version for explanation
6111	>	private final void fullAddCount(long x, CounterHashCode hc,
6112	>	boolean wasUncontended) {
6113	>	int h;
6114	>	if (hc == null) {
6115	>	hc = new CounterHashCode();
6116	>	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
6117	>	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
6118	>	threadCounterHashCode.set(hc);
6119	>	}
6120	>	else
6121	>	h = hc.code;
6122	>	boolean collide = false;                // True if last slot nonempty
6123	>	for (;;) {
6124	>	CounterCell[] as; CounterCell a; int n; long v;
6125	>	if ((as = counterCells) != null && (n = as.length) > 0) {
6126	>	if ((a = as[(n - 1) & h]) == null) {
6127	>	if (cellsBusy == 0) {            // Try to attach new Cell
6128	>	CounterCell r = new CounterCell(x); // Optimistic create
6129	>	if (cellsBusy == 0 &&
6130	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6131	>	boolean created = false;
6132	>	try {               // Recheck under lock
6133	>	CounterCell[] rs; int m, j;
6134	>	if ((rs = counterCells) != null &&
6135	>	(m = rs.length) > 0 &&
6136	>	rs[j = (m - 1) & h] == null) {
6137	>	rs[j] = r;
6138	>	created = true;
6139	>	}
6140	>	} finally {
6141	>	cellsBusy = 0;
6142	>	}
6143	>	if (created)
6144	>	break;
6145	>	continue;           // Slot is now non-empty
6146	>	}
6147	>	}
6148	>	collide = false;
6149	>	}
6150	>	else if (!wasUncontended)       // CAS already known to fail
6151	>	wasUncontended = true;      // Continue after rehash
6152	>	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
6153	>	break;
6154	>	else if (counterCells != as || n >= NCPU)
6155	>	collide = false;            // At max size or stale
6156	>	else if (!collide)
6157	>	collide = true;
6158	>	else if (cellsBusy == 0 &&
6159	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6160	>	try {
6161	>	if (counterCells == as) {// Expand table unless stale
6162	>	CounterCell[] rs = new CounterCell[n << 1];
6163	>	for (int i = 0; i < n; ++i)
6164	>	rs[i] = as[i];
6165	>	counterCells = rs;
6166	>	}
6167	>	} finally {
6168	>	cellsBusy = 0;
6169	>	}
6170	>	collide = false;
6171	>	continue;                   // Retry with expanded table
6172	>	}
6173	>	h ^= h << 13;                   // Rehash
6174	>	h ^= h >>> 17;
6175	>	h ^= h << 5;
6176	>	}
6177	>	else if (cellsBusy == 0 && counterCells == as &&
6178	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6179	>	boolean init = false;
6180	>	try {                           // Initialize table
6181	>	if (counterCells == as) {
6182	>	CounterCell[] rs = new CounterCell[2];
6183	>	rs[h & 1] = new CounterCell(x);
6184	>	counterCells = rs;
6185	>	init = true;
6186	>	}
6187	>	} finally {
6188	>	cellsBusy = 0;
6189		}
6190	+	if (init)
6191	+	break;
6192		}
6193	+	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
6194	+	break;                          // Fall back on using base
6195		}
6196	+	hc.code = h;                            // Record index for next time
6197		}
6198
6199		// Unsafe mechanics
6200	<	private static final sun.misc.Unsafe UNSAFE;
6201	<	private static final long counterOffset;
6202	<	private static final long sizeCtlOffset;
6200	>	private static final sun.misc.Unsafe U;
6201	>	private static final long SIZECTL;
6202	>	private static final long TRANSFERINDEX;
6203	>	private static final long BASECOUNT;
6204	>	private static final long CELLSBUSY;
6205	>	private static final long CELLVALUE;
6206		private static final long ABASE;
6207		private static final int ASHIFT;
6208
6209		static {
6617	–	int ss;
6210		try {
6211	<	UNSAFE = getUnsafe();
6211	>	U = getUnsafe();
6212		Class<?> k = ConcurrentHashMapV8.class;
6213	<	counterOffset = UNSAFE.objectFieldOffset
6622	<	(k.getDeclaredField("counter"));
6623	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6213	>	SIZECTL = U.objectFieldOffset
6214		(k.getDeclaredField("sizeCtl"));
6215	<	Class<?> sc = Node[].class;
6216	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6217	<	ss = UNSAFE.arrayIndexScale(sc);
6215	>	TRANSFERINDEX = U.objectFieldOffset
6216	>	(k.getDeclaredField("transferIndex"));
6217	>	BASECOUNT = U.objectFieldOffset
6218	>	(k.getDeclaredField("baseCount"));
6219	>	CELLSBUSY = U.objectFieldOffset
6220	>	(k.getDeclaredField("cellsBusy"));
6221	>	Class<?> ck = CounterCell.class;
6222	>	CELLVALUE = U.objectFieldOffset
6223	>	(ck.getDeclaredField("value"));
6224	>	Class<?> ak = Node[].class;
6225	>	ABASE = U.arrayBaseOffset(ak);
6226	>	int scale = U.arrayIndexScale(ak);
6227	>	if ((scale & (scale - 1)) != 0)
6228	>	throw new Error("data type scale not a power of two");
6229	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6230		} catch (Exception e) {
6231		throw new Error(e);
6232		}
6631	–	if ((ss & (ss-1)) != 0)
6632	–	throw new Error("data type scale not a power of two");
6633	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6233		}
6234
6235		/**
#	Line 6643 | Line 6242 | public class ConcurrentHashMapV8<K, V>
6242		private static sun.misc.Unsafe getUnsafe() {
6243		try {
6244		return sun.misc.Unsafe.getUnsafe();
6245	<	} catch (SecurityException se) {
6246	<	try {
6247	<	return java.security.AccessController.doPrivileged
6248	<	(new java.security
6249	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6250	<	public sun.misc.Unsafe run() throws Exception {
6251	<	java.lang.reflect.Field f = sun.misc
6252	<	.Unsafe.class.getDeclaredField("theUnsafe");
6253	<	f.setAccessible(true);
6254	<	return (sun.misc.Unsafe) f.get(null);
6255	<	}});
6256	<	} catch (java.security.PrivilegedActionException e) {
6257	<	throw new RuntimeException("Could not initialize intrinsics",
6258	<	e.getCause());
6259	<	}
6245	>	} catch (SecurityException tryReflectionInstead) {}
6246	>	try {
6247	>	return java.security.AccessController.doPrivileged
6248	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6249	>	public sun.misc.Unsafe run() throws Exception {
6250	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6251	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6252	>	f.setAccessible(true);
6253	>	Object x = f.get(null);
6254	>	if (k.isInstance(x))
6255	>	return k.cast(x);
6256	>	}
6257	>	throw new NoSuchFieldError("the Unsafe");
6258	>	}});
6259	>	} catch (java.security.PrivilegedActionException e) {
6260	>	throw new RuntimeException("Could not initialize intrinsics",
6261	>	e.getCause());
6262		}
6263		}
6264		}

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