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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.78 by jsr166, Sun Nov 18 18:03:10 2012 UTC vs.
Revision 1.102 by dl, Wed Jun 19 14:55:40 2013 UTC

#	Line 6 | Line 6
6
7		package jsr166e;
8
9	<	import java.util.Comparator;
9	>	import jsr166e.ForkJoinPool;
10	>
11	>	import java.io.ObjectStreamField;
12	>	import java.io.Serializable;
13	>	import java.lang.reflect.ParameterizedType;
14	>	import java.lang.reflect.Type;
15		import java.util.Arrays;
11	–	import java.util.Map;
12	–	import java.util.Set;
16		import java.util.Collection;
17	<	import java.util.AbstractMap;
18	<	import java.util.AbstractSet;
19	<	import java.util.AbstractCollection;
17	<	import java.util.Hashtable;
17	>	import java.util.Comparator;
18	>	import java.util.ConcurrentModificationException;
19	>	import java.util.Enumeration;
20		import java.util.HashMap;
21	+	import java.util.Hashtable;
22		import java.util.Iterator;
23	<	import java.util.Enumeration;
21	<	import java.util.ConcurrentModificationException;
23	>	import java.util.Map;
24		import java.util.NoSuchElementException;
25	+	import java.util.Set;
26		import java.util.concurrent.ConcurrentMap;
24	–	import java.util.concurrent.ThreadLocalRandom;
25	–	import java.util.concurrent.locks.LockSupport;
26	–	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
27		import java.util.concurrent.atomic.AtomicReference;
28	<
29	<	import java.io.Serializable;
28	>	import java.util.concurrent.atomic.AtomicInteger;
29	>	import java.util.concurrent.locks.LockSupport;
30	>	import java.util.concurrent.locks.ReentrantLock;
31
32		/**
33		* A hash table supporting full concurrency of retrievals and
#	Line 80 | Line 81 | import java.io.Serializable;
81		* expected {@code concurrencyLevel} as an additional hint for
82		* internal sizing.  Note that using many keys with exactly the same
83		* {@code hashCode()} is a sure way to slow down performance of any
84	<	* hash table.
84	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
85	>	* this class may use comparison order among keys to help break ties.
86		*
87		* <p>A {@link Set} projection of a ConcurrentHashMapV8 may be created
88		* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
#	Line 88 | Line 90 | import java.io.Serializable;
90		* mapped values are (perhaps transiently) not used or all take the
91		* same mapping value.
92		*
91	–	* <p>A ConcurrentHashMapV8 can be used as scalable frequency map (a
92	–	* form of histogram or multiset) by using {@link LongAdder} values
93	–	* and initializing via {@link #computeIfAbsent}. For example, to add
94	–	* a count to a {@code ConcurrentHashMapV8<String,LongAdder> freqs}, you
95	–	* can use {@code freqs.computeIfAbsent(k -> new
96	–	* LongAdder()).increment();}
97	–	*
93		* <p>This class and its views and iterators implement all of the
94		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
95		* interfaces.
#	Line 102 | Line 97 | import java.io.Serializable;
97		* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
98		* does <em>not</em> allow {@code null} to be used as a key or value.
99		*
100	<	* <p>ConcurrentHashMapV8s support parallel operations using the {@link
101	<	* ForkJoinPool#commonPool}. (Tasks that may be used in other contexts
102	<	* are available in class {@link ForkJoinTasks}). These operations are
103	<	* designed to be safely, and often sensibly, applied even with maps
104	<	* that are being concurrently updated by other threads; for example,
105	<	* when computing a snapshot summary of the values in a shared
106	<	* registry.  There are three kinds of operation, each with four
107	<	* forms, accepting functions with Keys, Values, Entries, and (Key,
108	<	* Value) arguments and/or return values. (The first three forms are
109	<	* also available via the {@link #keySet()}, {@link #values()} and
110	<	* {@link #entrySet()} views). Because the elements of a
111	<	* ConcurrentHashMapV8 are not ordered in any particular way, and may be
112	<	* processed in different orders in different parallel executions, the
113	<	* correctness of supplied functions should not depend on any
114	<	* ordering, or on any other objects or values that may transiently
120	<	* change while computation is in progress; and except for forEach
121	<	* actions, should ideally be side-effect-free.
100	>	* <p>ConcurrentHashMapV8s support a set of sequential and parallel bulk
101	>	* operations that are designed
102	>	* to be safely, and often sensibly, applied even with maps that are
103	>	* being concurrently updated by other threads; for example, when
104	>	* computing a snapshot summary of the values in a shared registry.
105	>	* There are three kinds of operation, each with four forms, accepting
106	>	* functions with Keys, Values, Entries, and (Key, Value) arguments
107	>	* and/or return values. Because the elements of a ConcurrentHashMapV8
108	>	* are not ordered in any particular way, and may be processed in
109	>	* different orders in different parallel executions, the correctness
110	>	* of supplied functions should not depend on any ordering, or on any
111	>	* other objects or values that may transiently change while
112	>	* computation is in progress; and except for forEach actions, should
113	>	* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry}
114	>	* objects do not support method {@code setValue}.
115		*
116		* <ul>
117		* <li> forEach: Perform a given action on each element.
#	Line 145 | Line 138 | import java.io.Serializable;
138		* <li> Reductions to scalar doubles, longs, and ints, using a
139		* given basis value.</li>
140		*
148	–	* </li>
141		* </ul>
142	+	* </li>
143		* </ul>
144		*
145	+	* <p>These bulk operations accept a {@code parallelismThreshold}
146	+	* argument. Methods proceed sequentially if the current map size is
147	+	* estimated to be less than the given threshold. Using a value of
148	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
149	+	* of {@code 1} results in maximal parallelism by partitioning into
150	+	* enough subtasks to fully utilize the {@link
151	+	* ForkJoinPool#commonPool()} that is used for all parallel
152	+	* computations. Normally, you would initially choose one of these
153	+	* extreme values, and then measure performance of using in-between
154	+	* values that trade off overhead versus throughput.
155	+	*
156		* <p>The concurrency properties of bulk operations follow
157		* from those of ConcurrentHashMapV8: Any non-null result returned
158		* from {@code get(key)} and related access methods bears a
#	Line 191 | Line 195 | import java.io.Serializable;
195		* exceptions, or would have done so if the first exception had
196		* not occurred.
197		*
198	<	* <p>Parallel speedups for bulk operations compared to sequential
199	<	* processing are common but not guaranteed.  Operations involving
200	<	* brief functions on small maps may execute more slowly than
201	<	* sequential loops if the underlying work to parallelize the
202	<	* computation is more expensive than the computation itself.
203	<	* Similarly, parallelization may not lead to much actual parallelism
204	<	* if all processors are busy performing unrelated tasks.
198	>	* <p>Speedups for parallel compared to sequential forms are common
199	>	* but not guaranteed.  Parallel operations involving brief functions
200	>	* on small maps may execute more slowly than sequential forms if the
201	>	* underlying work to parallelize the computation is more expensive
202	>	* than the computation itself.  Similarly, parallelization may not
203	>	* lead to much actual parallelism if all processors are busy
204	>	* performing unrelated tasks.
205		*
206		* <p>All arguments to all task methods must be non-null.
207		*
#	Line 214 | Line 218 | import java.io.Serializable;
218		* @param <K> the type of keys maintained by this map
219		* @param <V> the type of mapped values
220		*/
221	<	public class ConcurrentHashMapV8<K, V>
222	<	implements ConcurrentMap<K, V>, Serializable {
221	>	public class ConcurrentHashMapV8<K,V>
222	>	implements ConcurrentMap<K,V>, Serializable {
223		private static final long serialVersionUID = 7249069246763182397L;
224
225		/**
226	<	* A partitionable iterator. A Spliterator can be traversed
227	<	* directly, but can also be partitioned (before traversal) by
228	<	* creating another Spliterator that covers a non-overlapping
229	<	* portion of the elements, and so may be amenable to parallel
230	<	* execution.
231	<	*
232	<	* <p>This interface exports a subset of expected JDK8
233	<	* functionality.
234	<	*
235	<	* <p>Sample usage: Here is one (of the several) ways to compute
236	<	* the sum of the values held in a map using the ForkJoin
237	<	* framework. As illustrated here, Spliterators are well suited to
238	<	* designs in which a task repeatedly splits off half its work
239	<	* into forked subtasks until small enough to process directly,
240	<	* and then joins these subtasks. Variants of this style can also
241	<	* be used in completion-based designs.
242	<	*
243	<	* <pre>
244	<	* {@code ConcurrentHashMapV8<String, Long> m = ...
245	<	* // split as if have 8 * parallelism, for load balance
246	<	* int n = m.size();
247	<	* int p = aForkJoinPool.getParallelism() * 8;
244	<	* int split = (n < p)? n : p;
245	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
246	<	* // ...
247	<	* static class SumValues extends RecursiveTask<Long> {
248	<	*   final Spliterator<Long> s;
249	<	*   final int split;             // split while > 1
250	<	*   final SumValues nextJoin;    // records forked subtasks to join
251	<	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
252	<	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
253	<	*   }
254	<	*   public Long compute() {
255	<	*     long sum = 0;
256	<	*     SumValues subtasks = null; // fork subtasks
257	<	*     for (int s = split >>> 1; s > 0; s >>>= 1)
258	<	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
259	<	*     while (s.hasNext())        // directly process remaining elements
260	<	*       sum += s.next();
261	<	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
262	<	*       sum += t.join();         // collect subtask results
263	<	*     return sum;
264	<	*   }
265	<	* }
266	<	* }</pre>
267	<	*/
268	<	public static interface Spliterator<T> extends Iterator<T> {
269	<	/**
270	<	* Returns a Spliterator covering approximately half of the
271	<	* elements, guaranteed not to overlap with those subsequently
272	<	* returned by this Spliterator.  After invoking this method,
273	<	* the current Spliterator will <em>not</em> produce any of
274	<	* the elements of the returned Spliterator, but the two
275	<	* Spliterators together will produce all of the elements that
276	<	* would have been produced by this Spliterator had this
277	<	* method not been called. The exact number of elements
278	<	* produced by the returned Spliterator is not guaranteed, and
279	<	* may be zero (i.e., with {@code hasNext()} reporting {@code
280	<	* false}) if this Spliterator cannot be further split.
281	<	*
282	<	* @return a Spliterator covering approximately half of the
283	<	* elements
284	<	* @throws IllegalStateException if this Spliterator has
285	<	* already commenced traversing elements
286	<	*/
287	<	Spliterator<T> split();
226	>	* An object for traversing and partitioning elements of a source.
227	>	* This interface provides a subset of the functionality of JDK8
228	>	* java.util.Spliterator.
229	>	*/
230	>	public static interface ConcurrentHashMapSpliterator<T> {
231	>	/**
232	>	* If possible, returns a new spliterator covering
233	>	* approximately one half of the elements, which will not be
234	>	* covered by this spliterator. Returns null if cannot be
235	>	* split.
236	>	*/
237	>	ConcurrentHashMapSpliterator<T> trySplit();
238	>	/**
239	>	* Returns an estimate of the number of elements covered by
240	>	* this Spliterator.
241	>	*/
242	>	long estimateSize();
243	>
244	>	/** Applies the action to each untraversed element */
245	>	void forEachRemaining(Action<? super T> action);
246	>	/** If an element remains, applies the action and returns true. */
247	>	boolean tryAdvance(Action<? super T> action);
248		}
249
250	+	// Sams
251	+	/** Interface describing a void action of one argument */
252	+	public interface Action<A> { void apply(A a); }
253	+	/** Interface describing a void action of two arguments */
254	+	public interface BiAction<A,B> { void apply(A a, B b); }
255	+	/** Interface describing a function of one argument */
256	+	public interface Fun<A,T> { T apply(A a); }
257	+	/** Interface describing a function of two arguments */
258	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
259	+	/** Interface describing a function mapping its argument to a double */
260	+	public interface ObjectToDouble<A> { double apply(A a); }
261	+	/** Interface describing a function mapping its argument to a long */
262	+	public interface ObjectToLong<A> { long apply(A a); }
263	+	/** Interface describing a function mapping its argument to an int */
264	+	public interface ObjectToInt<A> {int apply(A a); }
265	+	/** Interface describing a function mapping two arguments to a double */
266	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
267	+	/** Interface describing a function mapping two arguments to a long */
268	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
269	+	/** Interface describing a function mapping two arguments to an int */
270	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
271	+	/** Interface describing a function mapping two doubles to a double */
272	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
273	+	/** Interface describing a function mapping two longs to a long */
274	+	public interface LongByLongToLong { long apply(long a, long b); }
275	+	/** Interface describing a function mapping two ints to an int */
276	+	public interface IntByIntToInt { int apply(int a, int b); }
277
278		/*
279		* Overview:
#	Line 298 | Line 285 | public class ConcurrentHashMapV8<K, V>
285		* the same or better than java.util.HashMap, and to support high
286		* initial insertion rates on an empty table by many threads.
287		*
288	<	* Each key-value mapping is held in a Node.  Because Node fields
289	<	* can contain special values, they are defined using plain Object
290	<	* types. Similarly in turn, all internal methods that use them
291	<	* work off Object types. And similarly, so do the internal
292	<	* methods of auxiliary iterator and view classes.  All public
293	<	* generic typed methods relay in/out of these internal methods,
294	<	* supplying null-checks and casts as needed. This also allows
295	<	* many of the public methods to be factored into a smaller number
296	<	* of internal methods (although sadly not so for the five
297	<	* variants of put-related operations). The validation-based
298	<	* approach explained below leads to a lot of code sprawl because
299	<	* retry-control precludes factoring into smaller methods.
288	>	* This map usually acts as a binned (bucketed) hash table.  Each
289	>	* key-value mapping is held in a Node.  Most nodes are instances
290	>	* of the basic Node class with hash, key, value, and next
291	>	* fields. However, various subclasses exist: TreeNodes are
292	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
293	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
294	>	* of bins during resizing. ReservationNodes are used as
295	>	* placeholders while establishing values in computeIfAbsent and
296	>	* related methods.  The types TreeBin, ForwardingNode, and
297	>	* ReservationNode do not hold normal user keys, values, or
298	>	* hashes, and are readily distinguishable during search etc
299	>	* because they have negative hash fields and null key and value
300	>	* fields. (These special nodes are either uncommon or transient,
301	>	* so the impact of carrying around some unused fields is
302	>	* insignficant.)
303		*
304		* The table is lazily initialized to a power-of-two size upon the
305		* first insertion.  Each bin in the table normally contains a
#	Line 317 | Line 307 | public class ConcurrentHashMapV8<K, V>
307		* Table accesses require volatile/atomic reads, writes, and
308		* CASes.  Because there is no other way to arrange this without
309		* adding further indirections, we use intrinsics
310	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
311	<	* are always accurately traversable under volatile reads, so long
312	<	* as lookups check hash code and non-nullness of value before
313	<	* checking key equality.
314	<	*
315	<	* We use the top two bits of Node hash fields for control
326	<	* purposes -- they are available anyway because of addressing
327	<	* constraints.  As explained further below, these top bits are
328	<	* used as follows:
329	<	*  00 - Normal
330	<	*  01 - Locked
331	<	*  11 - Locked and may have a thread waiting for lock
332	<	*  10 - Node is a forwarding node
333	<	*
334	<	* The lower 30 bits of each Node's hash field contain a
335	<	* transformation of the key's hash code, except for forwarding
336	<	* nodes, for which the lower bits are zero (and so always have
337	<	* hash field == MOVED).
310	>	* (sun.misc.Unsafe) operations.
311	>	*
312	>	* We use the top (sign) bit of Node hash fields for control
313	>	* purposes -- it is available anyway because of addressing
314	>	* constraints.  Nodes with negative hash fields are specially
315	>	* handled or ignored in map methods.
316		*
317		* Insertion (via put or its variants) of the first node in an
318		* empty bin is performed by just CASing it to the bin.  This is
#	Line 343 | Line 321 | public class ConcurrentHashMapV8<K, V>
321		* delete, and replace) require locks.  We do not want to waste
322		* the space required to associate a distinct lock object with
323		* each bin, so instead use the first node of a bin list itself as
324	<	* a lock. Blocking support for these locks relies on the builtin
325	<	* "synchronized" monitors.  However, we also need a tryLock
348	<	* construction, so we overlay these by using bits of the Node
349	<	* hash field for lock control (see above), and so normally use
350	<	* builtin monitors only for blocking and signalling using
351	<	* wait/notifyAll constructions. See Node.tryAwaitLock.
324	>	* a lock. Locking support for these locks relies on builtin
325	>	* "synchronized" monitors.
326		*
327		* Using the first node of a list as a lock does not by itself
328		* suffice though: When a node is locked, any update must first
329		* validate that it is still the first node after locking it, and
330		* retry if not. Because new nodes are always appended to lists,
331		* once a node is first in a bin, it remains first until deleted
332	<	* or the bin becomes invalidated (upon resizing).  However,
359	<	* operations that only conditionally update may inspect nodes
360	<	* until the point of update. This is a converse of sorts to the
361	<	* lazy locking technique described by Herlihy & Shavit.
332	>	* or the bin becomes invalidated (upon resizing).
333		*
334		* The main disadvantage of per-bin locks is that other update
335		* operations on other nodes in a bin list protected by the same
#	Line 391 | Line 362 | public class ConcurrentHashMapV8<K, V>
362		* sometimes deviate significantly from uniform randomness.  This
363		* includes the case when N > (1<<30), so some keys MUST collide.
364		* Similarly for dumb or hostile usages in which multiple keys are
365	<	* designed to have identical hash codes. Also, although we guard
366	<	* against the worst effects of this (see method spread), sets of
367	<	* hashes may differ only in bits that do not impact their bin
368	<	* index for a given power-of-two mask.  So we use a secondary
369	<	* strategy that applies when the number of nodes in a bin exceeds
370	<	* a threshold, and at least one of the keys implements
400	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
401	<	* (a specialized form of red-black trees), bounding search time
402	<	* to O(log N).  Each search step in a TreeBin is around twice as
365	>	* designed to have identical hash codes or ones that differs only
366	>	* in masked-out high bits. So we use a secondary strategy that
367	>	* applies when the number of nodes in a bin exceeds a
368	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
369	>	* specialized form of red-black trees), bounding search time to
370	>	* O(log N).  Each search step in a TreeBin is at least twice as
371		* slow as in a regular list, but given that N cannot exceed
372		* (1<<64) (before running out of addresses) this bounds search
373		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 410 | Line 378 | public class ConcurrentHashMapV8<K, V>
378		* iterators in the same way.
379		*
380		* The table is resized when occupancy exceeds a percentage
381	<	* threshold (nominally, 0.75, but see below).  Only a single
382	<	* thread performs the resize (using field "sizeCtl", to arrange
383	<	* exclusion), but the table otherwise remains usable for reads
384	<	* and updates. Resizing proceeds by transferring bins, one by
385	<	* one, from the table to the next table.  Because we are using
386	<	* power-of-two expansion, the elements from each bin must either
387	<	* stay at same index, or move with a power of two offset. We
388	<	* eliminate unnecessary node creation by catching cases where old
389	<	* nodes can be reused because their next fields won't change.  On
390	<	* average, only about one-sixth of them need cloning when a table
391	<	* doubles. The nodes they replace will be garbage collectable as
392	<	* soon as they are no longer referenced by any reader thread that
393	<	* may be in the midst of concurrently traversing table.  Upon
394	<	* transfer, the old table bin contains only a special forwarding
395	<	* node (with hash field "MOVED") that contains the next table as
396	<	* its key. On encountering a forwarding node, access and update
397	<	* operations restart, using the new table.
398	<	*
399	<	* Each bin transfer requires its bin lock. However, unlike other
400	<	* cases, a transfer can skip a bin if it fails to acquire its
401	<	* lock, and revisit it later (unless it is a TreeBin). Method
402	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
403	<	* have been skipped because of failure to acquire a lock, and
404	<	* blocks only if none are available (i.e., only very rarely).
405	<	* The transfer operation must also ensure that all accessible
406	<	* bins in both the old and new table are usable by any traversal.
407	<	* When there are no lock acquisition failures, this is arranged
408	<	* simply by proceeding from the last bin (table.length - 1) up
409	<	* towards the first.  Upon seeing a forwarding node, traversals
410	<	* (see class Iter) arrange to move to the new table
411	<	* without revisiting nodes.  However, when any node is skipped
412	<	* during a transfer, all earlier table bins may have become
413	<	* visible, so are initialized with a reverse-forwarding node back
414	<	* to the old table until the new ones are established. (This
415	<	* sometimes requires transiently locking a forwarding node, which
416	<	* is possible under the above encoding.) These more expensive
417	<	* mechanics trigger only when necessary.
381	>	* threshold (nominally, 0.75, but see below).  Any thread
382	>	* noticing an overfull bin may assist in resizing after the
383	>	* initiating thread allocates and sets up the replacement
384	>	* array. However, rather than stalling, these other threads may
385	>	* proceed with insertions etc.  The use of TreeBins shields us
386	>	* from the worst case effects of overfilling while resizes are in
387	>	* progress.  Resizing proceeds by transferring bins, one by one,
388	>	* from the table to the next table. To enable concurrency, the
389	>	* next table must be (incrementally) prefilled with place-holders
390	>	* serving as reverse forwarders to the old table.  Because we are
391	>	* using power-of-two expansion, the elements from each bin must
392	>	* either stay at same index, or move with a power of two
393	>	* offset. We eliminate unnecessary node creation by catching
394	>	* cases where old nodes can be reused because their next fields
395	>	* won't change.  On average, only about one-sixth of them need
396	>	* cloning when a table doubles. The nodes they replace will be
397	>	* garbage collectable as soon as they are no longer referenced by
398	>	* any reader thread that may be in the midst of concurrently
399	>	* traversing table.  Upon transfer, the old table bin contains
400	>	* only a special forwarding node (with hash field "MOVED") that
401	>	* contains the next table as its key. On encountering a
402	>	* forwarding node, access and update operations restart, using
403	>	* the new table.
404	>	*
405	>	* Each bin transfer requires its bin lock, which can stall
406	>	* waiting for locks while resizing. However, because other
407	>	* threads can join in and help resize rather than contend for
408	>	* locks, average aggregate waits become shorter as resizing
409	>	* progresses.  The transfer operation must also ensure that all
410	>	* accessible bins in both the old and new table are usable by any
411	>	* traversal.  This is arranged by proceeding from the last bin
412	>	* (table.length - 1) up towards the first.  Upon seeing a
413	>	* forwarding node, traversals (see class Traverser) arrange to
414	>	* move to the new table without revisiting nodes.  However, to
415	>	* ensure that no intervening nodes are skipped, bin splitting can
416	>	* only begin after the associated reverse-forwarders are in
417	>	* place.
418		*
419		* The traversal scheme also applies to partial traversals of
420		* ranges of bins (via an alternate Traverser constructor)
#	Line 461 | Line 429 | public class ConcurrentHashMapV8<K, V>
429		* These cases attempt to override the initial capacity settings,
430		* but harmlessly fail to take effect in cases of races.
431		*
432	<	* The element count is maintained using a LongAdder, which avoids
433	<	* contention on updates but can encounter cache thrashing if read
434	<	* too frequently during concurrent access. To avoid reading so
435	<	* often, resizing is attempted either when a bin lock is
436	<	* contended, or upon adding to a bin already holding two or more
437	<	* nodes (checked before adding in the xIfAbsent methods, after
438	<	* adding in others). Under uniform hash distributions, the
439	<	* probability of this occurring at threshold is around 13%,
440	<	* meaning that only about 1 in 8 puts check threshold (and after
441	<	* resizing, many fewer do so). But this approximation has high
442	<	* variance for small table sizes, so we check on any collision
443	<	* for sizes <= 64. The bulk putAll operation further reduces
444	<	* contention by only committing count updates upon these size
445	<	* checks.
432	>	* The element count is maintained using a specialization of
433	>	* LongAdder. We need to incorporate a specialization rather than
434	>	* just use a LongAdder in order to access implicit
435	>	* contention-sensing that leads to creation of multiple
436	>	* CounterCells.  The counter mechanics avoid contention on
437	>	* updates but can encounter cache thrashing if read too
438	>	* frequently during concurrent access. To avoid reading so often,
439	>	* resizing under contention is attempted only upon adding to a
440	>	* bin already holding two or more nodes. Under uniform hash
441	>	* distributions, the probability of this occurring at threshold
442	>	* is around 13%, meaning that only about 1 in 8 puts check
443	>	* threshold (and after resizing, many fewer do so).
444	>	*
445	>	* TreeBins use a special form of comparison for search and
446	>	* related operations (which is the main reason we cannot use
447	>	* existing collections such as TreeMaps). TreeBins contain
448	>	* Comparable elements, but may contain others, as well as
449	>	* elements that are Comparable but not necessarily Comparable
450	>	* for the same T, so we cannot invoke compareTo among them. To
451	>	* handle this, the tree is ordered primarily by hash value, then
452	>	* by Comparable.compareTo order if applicable.  On lookup at a
453	>	* node, if elements are not comparable or compare as 0 then both
454	>	* left and right children may need to be searched in the case of
455	>	* tied hash values. (This corresponds to the full list search
456	>	* that would be necessary if all elements were non-Comparable and
457	>	* had tied hashes.)  The red-black balancing code is updated from
458	>	* pre-jdk-collections
459	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
460	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
461	>	* Algorithms" (CLR).
462	>	*
463	>	* TreeBins also require an additional locking mechanism.  While
464	>	* list traversal is always possible by readers even during
465	>	* updates, tree traversal is not, mainly beause of tree-rotations
466	>	* that may change the root node and/or its linkages.  TreeBins
467	>	* include a simple read-write lock mechanism parasitic on the
468	>	* main bin-synchronization strategy: Structural adjustments
469	>	* associated with an insertion or removal are already bin-locked
470	>	* (and so cannot conflict with other writers) but must wait for
471	>	* ongoing readers to finish. Since there can be only one such
472	>	* waiter, we use a simple scheme using a single "waiter" field to
473	>	* block writers.  However, readers need never block.  If the root
474	>	* lock is held, they proceed along the slow traversal path (via
475	>	* next-pointers) until the lock becomes available or the list is
476	>	* exhausted, whichever comes first. These cases are not fast, but
477	>	* maximize aggregate expected throughput.
478		*
479		* Maintaining API and serialization compatibility with previous
480		* versions of this class introduces several oddities. Mainly: We
#	Line 484 | Line 484 | public class ConcurrentHashMapV8<K, V>
484		* time that we can guarantee to honor it.) We also declare an
485		* unused "Segment" class that is instantiated in minimal form
486		* only when serializing.
487	+	*
488	+	* This file is organized to make things a little easier to follow
489	+	* while reading than they might otherwise: First the main static
490	+	* declarations and utilities, then fields, then main public
491	+	* methods (with a few factorings of multiple public methods into
492	+	* internal ones), then sizing methods, trees, traversers, and
493	+	* bulk operations.
494		*/
495
496		/* ---------------- Constants -------------- */
#	Line 525 | Line 532 | public class ConcurrentHashMapV8<K, V>
532		private static final float LOAD_FACTOR = 0.75f;
533
534		/**
528	–	* The buffer size for skipped bins during transfers. The
529	–	* value is arbitrary but should be large enough to avoid
530	–	* most locking stalls during resizes.
531	–	*/
532	–	private static final int TRANSFER_BUFFER_SIZE = 32;
533	–
534	–	/**
535		* The bin count threshold for using a tree rather than list for a
536	<	* bin.  The value reflects the approximate break-even point for
537	<	* using tree-based operations.
536	>	* bin.  Bins are converted to trees when adding an element to a
537	>	* bin with at least this many nodes. The value must be greater
538	>	* than 2, and should be at least 8 to mesh with assumptions in
539	>	* tree removal about conversion back to plain bins upon
540	>	* shrinkage.
541		*/
542	<	private static final int TREE_THRESHOLD = 8;
540	<
541	<	/*
542	<	* Encodings for special uses of Node hash fields. See above for
543	<	* explanation.
544	<	*/
545	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
546	<	static final int LOCKED    = 0x40000000; // set/tested only as a bit
547	<	static final int WAITING   = 0xc0000000; // both bits set/tested together
548	<	static final int HASH_BITS = 0x3fffffff; // usable bits of normal node hash
549	<
550	<	/* ---------------- Fields -------------- */
542	>	static final int TREEIFY_THRESHOLD = 8;
543
544		/**
545	<	* The array of bins. Lazily initialized upon first insertion.
546	<	* Size is always a power of two. Accessed directly by iterators.
545	>	* The bin count threshold for untreeifying a (split) bin during a
546	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
547	>	* most 6 to mesh with shrinkage detection under removal.
548		*/
549	<	transient volatile Node[] table;
549	>	static final int UNTREEIFY_THRESHOLD = 6;
550
551		/**
552	<	* The counter maintaining number of elements.
552	>	* The smallest table capacity for which bins may be treeified.
553	>	* (Otherwise the table is resized if too many nodes in a bin.)
554	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
555	>	* conflicts between resizing and treeification thresholds.
556		*/
557	<	private transient final LongAdder counter;
557	>	static final int MIN_TREEIFY_CAPACITY = 64;
558
559		/**
560	<	* Table initialization and resizing control.  When negative, the
561	<	* table is being initialized or resized. Otherwise, when table is
562	<	* null, holds the initial table size to use upon creation, or 0
563	<	* for default. After initialization, holds the next element count
564	<	* value upon which to resize the table.
560	>	* Minimum number of rebinnings per transfer step. Ranges are
561	>	* subdivided to allow multiple resizer threads.  This value
562	>	* serves as a lower bound to avoid resizers encountering
563	>	* excessive memory contention.  The value should be at least
564	>	* DEFAULT_CAPACITY.
565		*/
566	<	private transient volatile int sizeCtl;
571	<
572	<	// views
573	<	private transient KeySetView<K,V> keySet;
574	<	private transient ValuesView<K,V> values;
575	<	private transient EntrySetView<K,V> entrySet;
576	<
577	<	/** For serialization compatibility. Null unless serialized; see below */
578	<	private Segment<K,V>[] segments;
579	<
580	<	/* ---------------- Table element access -------------- */
566	>	private static final int MIN_TRANSFER_STRIDE = 16;
567
568		/*
569	<	* Volatile access methods are used for table elements as well as
584	<	* elements of in-progress next table while resizing.  Uses are
585	<	* null checked by callers, and implicitly bounds-checked, relying
586	<	* on the invariants that tab arrays have non-zero size, and all
587	<	* indices are masked with (tab.length - 1) which is never
588	<	* negative and always less than length. Note that, to be correct
589	<	* wrt arbitrary concurrency errors by users, bounds checks must
590	<	* operate on local variables, which accounts for some odd-looking
591	<	* inline assignments below.
569	>	* Encodings for Node hash fields. See above for explanation.
570		*/
571	<
572	<	static final Node tabAt(Node[] tab, int i) { // used by Iter
573	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
574	<	}
575	<
576	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
577	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
578	<	}
579	<
580	<	private static final void setTabAt(Node[] tab, int i, Node v) {
581	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
582	<	}
571	>	static final int MOVED     = 0x8fffffff; // (-1) hash for forwarding nodes
572	>	static final int TREEBIN   = 0x80000000; // hash for heads of treea
573	>	static final int RESERVED  = 0x80000001; // hash for transient reservations
574	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
575	>
576	>	/** Number of CPUS, to place bounds on some sizings */
577	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
578	>
579	>	/** For serialization compatibility. */
580	>	private static final ObjectStreamField[] serialPersistentFields = {
581	>	new ObjectStreamField("segments", Segment[].class),
582	>	new ObjectStreamField("segmentMask", Integer.TYPE),
583	>	new ObjectStreamField("segmentShift", Integer.TYPE)
584	>	};
585
586		/* ---------------- Nodes -------------- */
587
588		/**
589	<	* Key-value entry. Note that this is never exported out as a
590	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
591	<	* field of MOVED are special, and do not contain user keys or
592	<	* values.  Otherwise, keys are never null, and null val fields
593	<	* indicate that a node is in the process of being deleted or
594	<	* created. For purposes of read-only access, a key may be read
595	<	* before a val, but can only be used after checking val to be
596	<	* non-null.
597	<	*/
598	<	static class Node {
599	<	volatile int hash;
600	<	final Object key;
621	<	volatile Object val;
622	<	volatile Node next;
589	>	* Key-value entry.  This class is never exported out as a
590	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
591	>	* MapEntry below), but can be used for read-only traversals used
592	>	* in bulk tasks.  Subclasses of Node with a negativehash field
593	>	* are special, and contain null keys and values (but are never
594	>	* exported).  Otherwise, keys and vals are never null.
595	>	*/
596	>	static class Node<K,V> implements Map.Entry<K,V> {
597	>	final int hash;
598	>	final K key;
599	>	volatile V val;
600	>	Node<K,V> next;
601
602	<	Node(int hash, Object key, Object val, Node next) {
602	>	Node(int hash, K key, V val, Node<K,V> next) {
603		this.hash = hash;
604		this.key = key;
605		this.val = val;
606		this.next = next;
607		}
608
609	<	/** CompareAndSet the hash field */
610	<	final boolean casHash(int cmp, int val) {
611	<	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
612	<	}
613	<
614	<	/** The number of spins before blocking for a lock */
637	<	static final int MAX_SPINS =
638	<	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
639	<
640	<	/**
641	<	* Spins a while if LOCKED bit set and this node is the first
642	<	* of its bin, and then sets WAITING bits on hash field and
643	<	* blocks (once) if they are still set.  It is OK for this
644	<	* method to return even if lock is not available upon exit,
645	<	* which enables these simple single-wait mechanics.
646	<	*
647	<	* The corresponding signalling operation is performed within
648	<	* callers: Upon detecting that WAITING has been set when
649	<	* unlocking lock (via a failed CAS from non-waiting LOCKED
650	<	* state), unlockers acquire the sync lock and perform a
651	<	* notifyAll.
652	<	*
653	<	* The initial sanity check on tab and bounds is not currently
654	<	* necessary in the only usages of this method, but enables
655	<	* use in other future contexts.
656	<	*/
657	<	final void tryAwaitLock(Node[] tab, int i) {
658	<	if (tab != null && i >= 0 && i < tab.length) { // sanity check
659	<	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
660	<	int spins = MAX_SPINS, h;
661	<	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
662	<	if (spins >= 0) {
663	<	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
664	<	if (r >= 0 && --spins == 0)
665	<	Thread.yield();  // yield before block
666	<	}
667	<	else if (casHash(h, h | WAITING)) {
668	<	synchronized (this) {
669	<	if (tabAt(tab, i) == this &&
670	<	(hash & WAITING) == WAITING) {
671	<	try {
672	<	wait();
673	<	} catch (InterruptedException ie) {
674	<	Thread.currentThread().interrupt();
675	<	}
676	<	}
677	<	else
678	<	notifyAll(); // possibly won race vs signaller
679	<	}
680	<	break;
681	<	}
682	<	}
683	<	}
684	<	}
685	<
686	<	// Unsafe mechanics for casHash
687	<	private static final sun.misc.Unsafe UNSAFE;
688	<	private static final long hashOffset;
689	<
690	<	static {
691	<	try {
692	<	UNSAFE = getUnsafe();
693	<	Class<?> k = Node.class;
694	<	hashOffset = UNSAFE.objectFieldOffset
695	<	(k.getDeclaredField("hash"));
696	<	} catch (Exception e) {
697	<	throw new Error(e);
698	<	}
699	<	}
700	<	}
701	<
702	<	/* ---------------- TreeBins -------------- */
703	<
704	<	/**
705	<	* Nodes for use in TreeBins
706	<	*/
707	<	static final class TreeNode extends Node {
708	<	TreeNode parent;  // red-black tree links
709	<	TreeNode left;
710	<	TreeNode right;
711	<	TreeNode prev;    // needed to unlink next upon deletion
712	<	boolean red;
713	<
714	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
715	<	super(hash, key, val, next);
716	<	this.parent = parent;
717	<	}
718	<	}
719	<
720	<	/**
721	<	* A specialized form of red-black tree for use in bins
722	<	* whose size exceeds a threshold.
723	<	*
724	<	* TreeBins use a special form of comparison for search and
725	<	* related operations (which is the main reason we cannot use
726	<	* existing collections such as TreeMaps). TreeBins contain
727	<	* Comparable elements, but may contain others, as well as
728	<	* elements that are Comparable but not necessarily Comparable<T>
729	<	* for the same T, so we cannot invoke compareTo among them. To
730	<	* handle this, the tree is ordered primarily by hash value, then
731	<	* by getClass().getName() order, and then by Comparator order
732	<	* among elements of the same class.  On lookup at a node, if
733	<	* elements are not comparable or compare as 0, both left and
734	<	* right children may need to be searched in the case of tied hash
735	<	* values. (This corresponds to the full list search that would be
736	<	* necessary if all elements were non-Comparable and had tied
737	<	* hashes.)  The red-black balancing code is updated from
738	<	* pre-jdk-collections
739	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
740	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
741	<	* Algorithms" (CLR).
742	<	*
743	<	* TreeBins also maintain a separate locking discipline than
744	<	* regular bins. Because they are forwarded via special MOVED
745	<	* nodes at bin heads (which can never change once established),
746	<	* we cannot use those nodes as locks. Instead, TreeBin
747	<	* extends AbstractQueuedSynchronizer to support a simple form of
748	<	* read-write lock. For update operations and table validation,
749	<	* the exclusive form of lock behaves in the same way as bin-head
750	<	* locks. However, lookups use shared read-lock mechanics to allow
751	<	* multiple readers in the absence of writers.  Additionally,
752	<	* these lookups do not ever block: While the lock is not
753	<	* available, they proceed along the slow traversal path (via
754	<	* next-pointers) until the lock becomes available or the list is
755	<	* exhausted, whichever comes first. (These cases are not fast,
756	<	* but maximize aggregate expected throughput.)  The AQS mechanics
757	<	* for doing this are straightforward.  The lock state is held as
758	<	* AQS getState().  Read counts are negative; the write count (1)
759	<	* is positive.  There are no signalling preferences among readers
760	<	* and writers. Since we don't need to export full Lock API, we
761	<	* just override the minimal AQS methods and use them directly.
762	<	*/
763	<	static final class TreeBin extends AbstractQueuedSynchronizer {
764	<	private static final long serialVersionUID = 2249069246763182397L;
765	<	transient TreeNode root;  // root of tree
766	<	transient TreeNode first; // head of next-pointer list
767	<
768	<	/* AQS overrides */
769	<	public final boolean isHeldExclusively() { return getState() > 0; }
770	<	public final boolean tryAcquire(int ignore) {
771	<	if (compareAndSetState(0, 1)) {
772	<	setExclusiveOwnerThread(Thread.currentThread());
773	<	return true;
774	<	}
775	<	return false;
776	<	}
777	<	public final boolean tryRelease(int ignore) {
778	<	setExclusiveOwnerThread(null);
779	<	setState(0);
780	<	return true;
781	<	}
782	<	public final int tryAcquireShared(int ignore) {
783	<	for (int c;;) {
784	<	if ((c = getState()) > 0)
785	<	return -1;
786	<	if (compareAndSetState(c, c -1))
787	<	return 1;
788	<	}
789	<	}
790	<	public final boolean tryReleaseShared(int ignore) {
791	<	int c;
792	<	do {} while (!compareAndSetState(c = getState(), c + 1));
793	<	return c == -1;
794	<	}
795	<
796	<	/** From CLR */
797	<	private void rotateLeft(TreeNode p) {
798	<	if (p != null) {
799	<	TreeNode r = p.right, pp, rl;
800	<	if ((rl = p.right = r.left) != null)
801	<	rl.parent = p;
802	<	if ((pp = r.parent = p.parent) == null)
803	<	root = r;
804	<	else if (pp.left == p)
805	<	pp.left = r;
806	<	else
807	<	pp.right = r;
808	<	r.left = p;
809	<	p.parent = r;
810	<	}
811	<	}
812	<
813	<	/** From CLR */
814	<	private void rotateRight(TreeNode p) {
815	<	if (p != null) {
816	<	TreeNode l = p.left, pp, lr;
817	<	if ((lr = p.left = l.right) != null)
818	<	lr.parent = p;
819	<	if ((pp = l.parent = p.parent) == null)
820	<	root = l;
821	<	else if (pp.right == p)
822	<	pp.right = l;
823	<	else
824	<	pp.left = l;
825	<	l.right = p;
826	<	p.parent = l;
827	<	}
828	<	}
829	<
830	<	/**
831	<	* Returns the TreeNode (or null if not found) for the given key
832	<	* starting at given root.
833	<	*/
834	<	@SuppressWarnings("unchecked") final TreeNode getTreeNode
835	<	(int h, Object k, TreeNode p) {
836	<	Class<?> c = k.getClass();
837	<	while (p != null) {
838	<	int dir, ph;  Object pk; Class<?> pc;
839	<	if ((ph = p.hash) == h) {
840	<	if ((pk = p.key) == k || k.equals(pk))
841	<	return p;
842	<	if (c != (pc = pk.getClass()) ||
843	<	!(k instanceof Comparable) ||
844	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
845	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
846	<	TreeNode r = null, s = null, pl, pr;
847	<	if (dir >= 0) {
848	<	if ((pl = p.left) != null && h <= pl.hash)
849	<	s = pl;
850	<	}
851	<	else if ((pr = p.right) != null && h >= pr.hash)
852	<	s = pr;
853	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
854	<	return r;
855	<	}
856	<	}
857	<	else
858	<	dir = (h < ph) ? -1 : 1;
859	<	p = (dir > 0) ? p.right : p.left;
860	<	}
861	<	return null;
609	>	public final K getKey()       { return key; }
610	>	public final V getValue()     { return val; }
611	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
612	>	public final String toString(){ return key + "=" + val; }
613	>	public final V setValue(V value) {
614	>	throw new UnsupportedOperationException();
615		}
616
617	<	/**
618	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
619	<	* read-lock to call getTreeNode, but during failure to get
620	<	* lock, searches along next links.
621	<	*/
622	<	final Object getValue(int h, Object k) {
623	<	Node r = null;
871	<	int c = getState(); // Must read lock state first
872	<	for (Node e = first; e != null; e = e.next) {
873	<	if (c <= 0 && compareAndSetState(c, c - 1)) {
874	<	try {
875	<	r = getTreeNode(h, k, root);
876	<	} finally {
877	<	releaseShared(0);
878	<	}
879	<	break;
880	<	}
881	<	else if ((e.hash & HASH_BITS) == h && k.equals(e.key)) {
882	<	r = e;
883	<	break;
884	<	}
885	<	else
886	<	c = getState();
887	<	}
888	<	return r == null ? null : r.val;
617	>	public final boolean equals(Object o) {
618	>	Object k, v, u; Map.Entry<?,?> e;
619	>	return ((o instanceof Map.Entry) &&
620	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
621	>	(v = e.getValue()) != null &&
622	>	(k == key || k.equals(key)) &&
623	>	(v == (u = val) || v.equals(u)));
624		}
625
626		/**
627	<	* Finds or adds a node.
893	<	* @return null if added
627	>	* Virtualized support for map.get(); overridden in subclasses.
628		*/
629	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
630	<	(int h, Object k, Object v) {
631	<	Class<?> c = k.getClass();
632	<	TreeNode pp = root, p = null;
633	<	int dir = 0;
634	<	while (pp != null) { // find existing node or leaf to insert at
635	<	int ph;  Object pk; Class<?> pc;
636	<	p = pp;
637	<	if ((ph = p.hash) == h) {
904	<	if ((pk = p.key) == k || k.equals(pk))
905	<	return p;
906	<	if (c != (pc = pk.getClass()) ||
907	<	!(k instanceof Comparable) ||
908	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
909	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
910	<	TreeNode r = null, s = null, pl, pr;
911	<	if (dir >= 0) {
912	<	if ((pl = p.left) != null && h <= pl.hash)
913	<	s = pl;
914	<	}
915	<	else if ((pr = p.right) != null && h >= pr.hash)
916	<	s = pr;
917	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
918	<	return r;
919	<	}
920	<	}
921	<	else
922	<	dir = (h < ph) ? -1 : 1;
923	<	pp = (dir > 0) ? p.right : p.left;
924	<	}
925	<
926	<	TreeNode f = first;
927	<	TreeNode x = first = new TreeNode(h, k, v, f, p);
928	<	if (p == null)
929	<	root = x;
930	<	else { // attach and rebalance; adapted from CLR
931	<	TreeNode xp, xpp;
932	<	if (f != null)
933	<	f.prev = x;
934	<	if (dir <= 0)
935	<	p.left = x;
936	<	else
937	<	p.right = x;
938	<	x.red = true;
939	<	while (x != null && (xp = x.parent) != null && xp.red &&
940	<	(xpp = xp.parent) != null) {
941	<	TreeNode xppl = xpp.left;
942	<	if (xp == xppl) {
943	<	TreeNode y = xpp.right;
944	<	if (y != null && y.red) {
945	<	y.red = false;
946	<	xp.red = false;
947	<	xpp.red = true;
948	<	x = xpp;
949	<	}
950	<	else {
951	<	if (x == xp.right) {
952	<	rotateLeft(x = xp);
953	<	xpp = (xp = x.parent) == null ? null : xp.parent;
954	<	}
955	<	if (xp != null) {
956	<	xp.red = false;
957	<	if (xpp != null) {
958	<	xpp.red = true;
959	<	rotateRight(xpp);
960	<	}
961	<	}
962	<	}
963	<	}
964	<	else {
965	<	TreeNode y = xppl;
966	<	if (y != null && y.red) {
967	<	y.red = false;
968	<	xp.red = false;
969	<	xpp.red = true;
970	<	x = xpp;
971	<	}
972	<	else {
973	<	if (x == xp.left) {
974	<	rotateRight(x = xp);
975	<	xpp = (xp = x.parent) == null ? null : xp.parent;
976	<	}
977	<	if (xp != null) {
978	<	xp.red = false;
979	<	if (xpp != null) {
980	<	xpp.red = true;
981	<	rotateLeft(xpp);
982	<	}
983	<	}
984	<	}
985	<	}
986	<	}
987	<	TreeNode r = root;
988	<	if (r != null && r.red)
989	<	r.red = false;
629	>	Node<K,V> find(int h, Object k) {
630	>	Node<K,V> e = this;
631	>	if (k != null) {
632	>	do {
633	>	K ek;
634	>	if (e.hash == h &&
635	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
636	>	return e;
637	>	} while ((e = e.next) != null);
638		}
639		return null;
640		}
993	–
994	–	/**
995	–	* Removes the given node, that must be present before this
996	–	* call.  This is messier than typical red-black deletion code
997	–	* because we cannot swap the contents of an interior node
998	–	* with a leaf successor that is pinned by "next" pointers
999	–	* that are accessible independently of lock. So instead we
1000	–	* swap the tree linkages.
1001	–	*/
1002	–	final void deleteTreeNode(TreeNode p) {
1003	–	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
1004	–	TreeNode pred = p.prev;
1005	–	if (pred == null)
1006	–	first = next;
1007	–	else
1008	–	pred.next = next;
1009	–	if (next != null)
1010	–	next.prev = pred;
1011	–	TreeNode replacement;
1012	–	TreeNode pl = p.left;
1013	–	TreeNode pr = p.right;
1014	–	if (pl != null && pr != null) {
1015	–	TreeNode s = pr, sl;
1016	–	while ((sl = s.left) != null) // find successor
1017	–	s = sl;
1018	–	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
1019	–	TreeNode sr = s.right;
1020	–	TreeNode pp = p.parent;
1021	–	if (s == pr) { // p was s's direct parent
1022	–	p.parent = s;
1023	–	s.right = p;
1024	–	}
1025	–	else {
1026	–	TreeNode sp = s.parent;
1027	–	if ((p.parent = sp) != null) {
1028	–	if (s == sp.left)
1029	–	sp.left = p;
1030	–	else
1031	–	sp.right = p;
1032	–	}
1033	–	if ((s.right = pr) != null)
1034	–	pr.parent = s;
1035	–	}
1036	–	p.left = null;
1037	–	if ((p.right = sr) != null)
1038	–	sr.parent = p;
1039	–	if ((s.left = pl) != null)
1040	–	pl.parent = s;
1041	–	if ((s.parent = pp) == null)
1042	–	root = s;
1043	–	else if (p == pp.left)
1044	–	pp.left = s;
1045	–	else
1046	–	pp.right = s;
1047	–	replacement = sr;
1048	–	}
1049	–	else
1050	–	replacement = (pl != null) ? pl : pr;
1051	–	TreeNode pp = p.parent;
1052	–	if (replacement == null) {
1053	–	if (pp == null) {
1054	–	root = null;
1055	–	return;
1056	–	}
1057	–	replacement = p;
1058	–	}
1059	–	else {
1060	–	replacement.parent = pp;
1061	–	if (pp == null)
1062	–	root = replacement;
1063	–	else if (p == pp.left)
1064	–	pp.left = replacement;
1065	–	else
1066	–	pp.right = replacement;
1067	–	p.left = p.right = p.parent = null;
1068	–	}
1069	–	if (!p.red) { // rebalance, from CLR
1070	–	TreeNode x = replacement;
1071	–	while (x != null) {
1072	–	TreeNode xp, xpl;
1073	–	if (x.red || (xp = x.parent) == null) {
1074	–	x.red = false;
1075	–	break;
1076	–	}
1077	–	if (x == (xpl = xp.left)) {
1078	–	TreeNode sib = xp.right;
1079	–	if (sib != null && sib.red) {
1080	–	sib.red = false;
1081	–	xp.red = true;
1082	–	rotateLeft(xp);
1083	–	sib = (xp = x.parent) == null ? null : xp.right;
1084	–	}
1085	–	if (sib == null)
1086	–	x = xp;
1087	–	else {
1088	–	TreeNode sl = sib.left, sr = sib.right;
1089	–	if ((sr == null || !sr.red) &&
1090	–	(sl == null || !sl.red)) {
1091	–	sib.red = true;
1092	–	x = xp;
1093	–	}
1094	–	else {
1095	–	if (sr == null || !sr.red) {
1096	–	if (sl != null)
1097	–	sl.red = false;
1098	–	sib.red = true;
1099	–	rotateRight(sib);
1100	–	sib = (xp = x.parent) == null ? null : xp.right;
1101	–	}
1102	–	if (sib != null) {
1103	–	sib.red = (xp == null) ? false : xp.red;
1104	–	if ((sr = sib.right) != null)
1105	–	sr.red = false;
1106	–	}
1107	–	if (xp != null) {
1108	–	xp.red = false;
1109	–	rotateLeft(xp);
1110	–	}
1111	–	x = root;
1112	–	}
1113	–	}
1114	–	}
1115	–	else { // symmetric
1116	–	TreeNode sib = xpl;
1117	–	if (sib != null && sib.red) {
1118	–	sib.red = false;
1119	–	xp.red = true;
1120	–	rotateRight(xp);
1121	–	sib = (xp = x.parent) == null ? null : xp.left;
1122	–	}
1123	–	if (sib == null)
1124	–	x = xp;
1125	–	else {
1126	–	TreeNode sl = sib.left, sr = sib.right;
1127	–	if ((sl == null || !sl.red) &&
1128	–	(sr == null || !sr.red)) {
1129	–	sib.red = true;
1130	–	x = xp;
1131	–	}
1132	–	else {
1133	–	if (sl == null || !sl.red) {
1134	–	if (sr != null)
1135	–	sr.red = false;
1136	–	sib.red = true;
1137	–	rotateLeft(sib);
1138	–	sib = (xp = x.parent) == null ? null : xp.left;
1139	–	}
1140	–	if (sib != null) {
1141	–	sib.red = (xp == null) ? false : xp.red;
1142	–	if ((sl = sib.left) != null)
1143	–	sl.red = false;
1144	–	}
1145	–	if (xp != null) {
1146	–	xp.red = false;
1147	–	rotateRight(xp);
1148	–	}
1149	–	x = root;
1150	–	}
1151	–	}
1152	–	}
1153	–	}
1154	–	}
1155	–	if (p == replacement && (pp = p.parent) != null) {
1156	–	if (p == pp.left) // detach pointers
1157	–	pp.left = null;
1158	–	else if (p == pp.right)
1159	–	pp.right = null;
1160	–	p.parent = null;
1161	–	}
1162	–	}
641		}
642
643	<	/* ---------------- Collision reduction methods -------------- */
643	>	/* ---------------- Static utilities -------------- */
644
645		/**
646	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
647	<	* Because the table uses power-of-two masking, sets of hashes
648	<	* that vary only in bits above the current mask will always
649	<	* collide. (Among known examples are sets of Float keys holding
650	<	* consecutive whole numbers in small tables.)  To counter this,
651	<	* we apply a transform that spreads the impact of higher bits
646	>	* Spreads (XORs) higher bits of hash to lower and also forces top
647	>	* bit to 0. Because the table uses power-of-two masking, sets of
648	>	* hashes that vary only in bits above the current mask will
649	>	* always collide. (Among known examples are sets of Float keys
650	>	* holding consecutive whole numbers in small tables.)  So we
651	>	* apply a transform that spreads the impact of higher bits
652		* downward. There is a tradeoff between speed, utility, and
653		* quality of bit-spreading. Because many common sets of hashes
654	<	* are already reasonably distributed across bits (so don't benefit
655	<	* from spreading), and because we use trees to handle large sets
656	<	* of collisions in bins, we don't need excessively high quality.
657	<	*/
658	<	private static final int spread(int h) {
659	<	h ^= (h >>> 18) ^ (h >>> 12);
1182	<	return (h ^ (h >>> 10)) & HASH_BITS;
1183	<	}
1184	<
1185	<	/**
1186	<	* Replaces a list bin with a tree bin. Call only when locked.
1187	<	* Fails to replace if the given key is non-comparable or table
1188	<	* is, or needs, resizing.
1189	<	*/
1190	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
1191	<	if ((key instanceof Comparable) &&
1192	<	(tab.length >= MAXIMUM_CAPACITY || counter.sum() < (long)sizeCtl)) {
1193	<	TreeBin t = new TreeBin();
1194	<	for (Node e = tabAt(tab, index); e != null; e = e.next)
1195	<	t.putTreeNode(e.hash & HASH_BITS, e.key, e.val);
1196	<	setTabAt(tab, index, new Node(MOVED, t, null, null));
1197	<	}
1198	<	}
1199	<
1200	<	/* ---------------- Internal access and update methods -------------- */
1201	<
1202	<	/** Implementation for get and containsKey */
1203	<	private final Object internalGet(Object k) {
1204	<	int h = spread(k.hashCode());
1205	<	retry: for (Node[] tab = table; tab != null;) {
1206	<	Node e, p; Object ek, ev; int eh;      // locals to read fields once
1207	<	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1208	<	if ((eh = e.hash) == MOVED) {
1209	<	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1210	<	return ((TreeBin)ek).getValue(h, k);
1211	<	else {                        // restart with new table
1212	<	tab = (Node[])ek;
1213	<	continue retry;
1214	<	}
1215	<	}
1216	<	else if ((eh & HASH_BITS) == h && (ev = e.val) != null &&
1217	<	((ek = e.key) == k || k.equals(ek)))
1218	<	return ev;
1219	<	}
1220	<	break;
1221	<	}
1222	<	return null;
1223	<	}
1224	<
1225	<	/**
1226	<	* Implementation for the four public remove/replace methods:
1227	<	* Replaces node value with v, conditional upon match of cv if
1228	<	* non-null.  If resulting value is null, delete.
654	>	* are already reasonably distributed (so don't benefit from
655	>	* spreading), and because we use trees to handle large sets of
656	>	* collisions in bins, we just XOR some shifted bits in the
657	>	* cheapest possible way to reduce systematic lossage, as well as
658	>	* to incorporate impact of the highest bits that would otherwise
659	>	* never be used in index calculations because of table bounds.
660		*/
661	<	private final Object internalReplace(Object k, Object v, Object cv) {
662	<	int h = spread(k.hashCode());
1232	<	Object oldVal = null;
1233	<	for (Node[] tab = table;;) {
1234	<	Node f; int i, fh; Object fk;
1235	<	if (tab == null ||
1236	<	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1237	<	break;
1238	<	else if ((fh = f.hash) == MOVED) {
1239	<	if ((fk = f.key) instanceof TreeBin) {
1240	<	TreeBin t = (TreeBin)fk;
1241	<	boolean validated = false;
1242	<	boolean deleted = false;
1243	<	t.acquire(0);
1244	<	try {
1245	<	if (tabAt(tab, i) == f) {
1246	<	validated = true;
1247	<	TreeNode p = t.getTreeNode(h, k, t.root);
1248	<	if (p != null) {
1249	<	Object pv = p.val;
1250	<	if (cv == null || cv == pv || cv.equals(pv)) {
1251	<	oldVal = pv;
1252	<	if ((p.val = v) == null) {
1253	<	deleted = true;
1254	<	t.deleteTreeNode(p);
1255	<	}
1256	<	}
1257	<	}
1258	<	}
1259	<	} finally {
1260	<	t.release(0);
1261	<	}
1262	<	if (validated) {
1263	<	if (deleted)
1264	<	counter.add(-1L);
1265	<	break;
1266	<	}
1267	<	}
1268	<	else
1269	<	tab = (Node[])fk;
1270	<	}
1271	<	else if ((fh & HASH_BITS) != h && f.next == null) // precheck
1272	<	break;                          // rules out possible existence
1273	<	else if ((fh & LOCKED) != 0) {
1274	<	checkForResize();               // try resizing if can't get lock
1275	<	f.tryAwaitLock(tab, i);
1276	<	}
1277	<	else if (f.casHash(fh, fh | LOCKED)) {
1278	<	boolean validated = false;
1279	<	boolean deleted = false;
1280	<	try {
1281	<	if (tabAt(tab, i) == f) {
1282	<	validated = true;
1283	<	for (Node e = f, pred = null;;) {
1284	<	Object ek, ev;
1285	<	if ((e.hash & HASH_BITS) == h &&
1286	<	((ev = e.val) != null) &&
1287	<	((ek = e.key) == k || k.equals(ek))) {
1288	<	if (cv == null || cv == ev || cv.equals(ev)) {
1289	<	oldVal = ev;
1290	<	if ((e.val = v) == null) {
1291	<	deleted = true;
1292	<	Node en = e.next;
1293	<	if (pred != null)
1294	<	pred.next = en;
1295	<	else
1296	<	setTabAt(tab, i, en);
1297	<	}
1298	<	}
1299	<	break;
1300	<	}
1301	<	pred = e;
1302	<	if ((e = e.next) == null)
1303	<	break;
1304	<	}
1305	<	}
1306	<	} finally {
1307	<	if (!f.casHash(fh | LOCKED, fh)) {
1308	<	f.hash = fh;
1309	<	synchronized (f) { f.notifyAll(); };
1310	<	}
1311	<	}
1312	<	if (validated) {
1313	<	if (deleted)
1314	<	counter.add(-1L);
1315	<	break;
1316	<	}
1317	<	}
1318	<	}
1319	<	return oldVal;
1320	<	}
1321	<
1322	<	/*
1323	<	* Internal versions of the six insertion methods, each a
1324	<	* little more complicated than the last. All have
1325	<	* the same basic structure as the first (internalPut):
1326	<	*  1. If table uninitialized, create
1327	<	*  2. If bin empty, try to CAS new node
1328	<	*  3. If bin stale, use new table
1329	<	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1330	<	*  5. Lock and validate; if valid, scan and add or update
1331	<	*
1332	<	* The others interweave other checks and/or alternative actions:
1333	<	*  * Plain put checks for and performs resize after insertion.
1334	<	*  * putIfAbsent prescans for mapping without lock (and fails to add
1335	<	*    if present), which also makes pre-emptive resize checks worthwhile.
1336	<	*  * computeIfAbsent extends form used in putIfAbsent with additional
1337	<	*    mechanics to deal with, calls, potential exceptions and null
1338	<	*    returns from function call.
1339	<	*  * compute uses the same function-call mechanics, but without
1340	<	*    the prescans
1341	<	*  * merge acts as putIfAbsent in the absent case, but invokes the
1342	<	*    update function if present
1343	<	*  * putAll attempts to pre-allocate enough table space
1344	<	*    and more lazily performs count updates and checks.
1345	<	*
1346	<	* Someday when details settle down a bit more, it might be worth
1347	<	* some factoring to reduce sprawl.
1348	<	*/
1349	<
1350	<	/** Implementation for put */
1351	<	private final Object internalPut(Object k, Object v) {
1352	<	int h = spread(k.hashCode());
1353	<	int count = 0;
1354	<	for (Node[] tab = table;;) {
1355	<	int i; Node f; int fh; Object fk;
1356	<	if (tab == null)
1357	<	tab = initTable();
1358	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1359	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1360	<	break;                   // no lock when adding to empty bin
1361	<	}
1362	<	else if ((fh = f.hash) == MOVED) {
1363	<	if ((fk = f.key) instanceof TreeBin) {
1364	<	TreeBin t = (TreeBin)fk;
1365	<	Object oldVal = null;
1366	<	t.acquire(0);
1367	<	try {
1368	<	if (tabAt(tab, i) == f) {
1369	<	count = 2;
1370	<	TreeNode p = t.putTreeNode(h, k, v);
1371	<	if (p != null) {
1372	<	oldVal = p.val;
1373	<	p.val = v;
1374	<	}
1375	<	}
1376	<	} finally {
1377	<	t.release(0);
1378	<	}
1379	<	if (count != 0) {
1380	<	if (oldVal != null)
1381	<	return oldVal;
1382	<	break;
1383	<	}
1384	<	}
1385	<	else
1386	<	tab = (Node[])fk;
1387	<	}
1388	<	else if ((fh & LOCKED) != 0) {
1389	<	checkForResize();
1390	<	f.tryAwaitLock(tab, i);
1391	<	}
1392	<	else if (f.casHash(fh, fh | LOCKED)) {
1393	<	Object oldVal = null;
1394	<	try {                        // needed in case equals() throws
1395	<	if (tabAt(tab, i) == f) {
1396	<	count = 1;
1397	<	for (Node e = f;; ++count) {
1398	<	Object ek, ev;
1399	<	if ((e.hash & HASH_BITS) == h &&
1400	<	(ev = e.val) != null &&
1401	<	((ek = e.key) == k || k.equals(ek))) {
1402	<	oldVal = ev;
1403	<	e.val = v;
1404	<	break;
1405	<	}
1406	<	Node last = e;
1407	<	if ((e = e.next) == null) {
1408	<	last.next = new Node(h, k, v, null);
1409	<	if (count >= TREE_THRESHOLD)
1410	<	replaceWithTreeBin(tab, i, k);
1411	<	break;
1412	<	}
1413	<	}
1414	<	}
1415	<	} finally {                  // unlock and signal if needed
1416	<	if (!f.casHash(fh | LOCKED, fh)) {
1417	<	f.hash = fh;
1418	<	synchronized (f) { f.notifyAll(); };
1419	<	}
1420	<	}
1421	<	if (count != 0) {
1422	<	if (oldVal != null)
1423	<	return oldVal;
1424	<	if (tab.length <= 64)
1425	<	count = 2;
1426	<	break;
1427	<	}
1428	<	}
1429	<	}
1430	<	counter.add(1L);
1431	<	if (count > 1)
1432	<	checkForResize();
1433	<	return null;
1434	<	}
1435	<
1436	<	/** Implementation for putIfAbsent */
1437	<	private final Object internalPutIfAbsent(Object k, Object v) {
1438	<	int h = spread(k.hashCode());
1439	<	int count = 0;
1440	<	for (Node[] tab = table;;) {
1441	<	int i; Node f; int fh; Object fk, fv;
1442	<	if (tab == null)
1443	<	tab = initTable();
1444	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1445	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1446	<	break;
1447	<	}
1448	<	else if ((fh = f.hash) == MOVED) {
1449	<	if ((fk = f.key) instanceof TreeBin) {
1450	<	TreeBin t = (TreeBin)fk;
1451	<	Object oldVal = null;
1452	<	t.acquire(0);
1453	<	try {
1454	<	if (tabAt(tab, i) == f) {
1455	<	count = 2;
1456	<	TreeNode p = t.putTreeNode(h, k, v);
1457	<	if (p != null)
1458	<	oldVal = p.val;
1459	<	}
1460	<	} finally {
1461	<	t.release(0);
1462	<	}
1463	<	if (count != 0) {
1464	<	if (oldVal != null)
1465	<	return oldVal;
1466	<	break;
1467	<	}
1468	<	}
1469	<	else
1470	<	tab = (Node[])fk;
1471	<	}
1472	<	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1473	<	((fk = f.key) == k || k.equals(fk)))
1474	<	return fv;
1475	<	else {
1476	<	Node g = f.next;
1477	<	if (g != null) { // at least 2 nodes -- search and maybe resize
1478	<	for (Node e = g;;) {
1479	<	Object ek, ev;
1480	<	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1481	<	((ek = e.key) == k || k.equals(ek)))
1482	<	return ev;
1483	<	if ((e = e.next) == null) {
1484	<	checkForResize();
1485	<	break;
1486	<	}
1487	<	}
1488	<	}
1489	<	if (((fh = f.hash) & LOCKED) != 0) {
1490	<	checkForResize();
1491	<	f.tryAwaitLock(tab, i);
1492	<	}
1493	<	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1494	<	Object oldVal = null;
1495	<	try {
1496	<	if (tabAt(tab, i) == f) {
1497	<	count = 1;
1498	<	for (Node e = f;; ++count) {
1499	<	Object ek, ev;
1500	<	if ((e.hash & HASH_BITS) == h &&
1501	<	(ev = e.val) != null &&
1502	<	((ek = e.key) == k || k.equals(ek))) {
1503	<	oldVal = ev;
1504	<	break;
1505	<	}
1506	<	Node last = e;
1507	<	if ((e = e.next) == null) {
1508	<	last.next = new Node(h, k, v, null);
1509	<	if (count >= TREE_THRESHOLD)
1510	<	replaceWithTreeBin(tab, i, k);
1511	<	break;
1512	<	}
1513	<	}
1514	<	}
1515	<	} finally {
1516	<	if (!f.casHash(fh | LOCKED, fh)) {
1517	<	f.hash = fh;
1518	<	synchronized (f) { f.notifyAll(); };
1519	<	}
1520	<	}
1521	<	if (count != 0) {
1522	<	if (oldVal != null)
1523	<	return oldVal;
1524	<	if (tab.length <= 64)
1525	<	count = 2;
1526	<	break;
1527	<	}
1528	<	}
1529	<	}
1530	<	}
1531	<	counter.add(1L);
1532	<	if (count > 1)
1533	<	checkForResize();
1534	<	return null;
1535	<	}
1536	<
1537	<	/** Implementation for computeIfAbsent */
1538	<	private final Object internalComputeIfAbsent(K k,
1539	<	Fun<? super K, ?> mf) {
1540	<	int h = spread(k.hashCode());
1541	<	Object val = null;
1542	<	int count = 0;
1543	<	for (Node[] tab = table;;) {
1544	<	Node f; int i, fh; Object fk, fv;
1545	<	if (tab == null)
1546	<	tab = initTable();
1547	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1548	<	Node node = new Node(fh = h | LOCKED, k, null, null);
1549	<	if (casTabAt(tab, i, null, node)) {
1550	<	count = 1;
1551	<	try {
1552	<	if ((val = mf.apply(k)) != null)
1553	<	node.val = val;
1554	<	} finally {
1555	<	if (val == null)
1556	<	setTabAt(tab, i, null);
1557	<	if (!node.casHash(fh, h)) {
1558	<	node.hash = h;
1559	<	synchronized (node) { node.notifyAll(); };
1560	<	}
1561	<	}
1562	<	}
1563	<	if (count != 0)
1564	<	break;
1565	<	}
1566	<	else if ((fh = f.hash) == MOVED) {
1567	<	if ((fk = f.key) instanceof TreeBin) {
1568	<	TreeBin t = (TreeBin)fk;
1569	<	boolean added = false;
1570	<	t.acquire(0);
1571	<	try {
1572	<	if (tabAt(tab, i) == f) {
1573	<	count = 1;
1574	<	TreeNode p = t.getTreeNode(h, k, t.root);
1575	<	if (p != null)
1576	<	val = p.val;
1577	<	else if ((val = mf.apply(k)) != null) {
1578	<	added = true;
1579	<	count = 2;
1580	<	t.putTreeNode(h, k, val);
1581	<	}
1582	<	}
1583	<	} finally {
1584	<	t.release(0);
1585	<	}
1586	<	if (count != 0) {
1587	<	if (!added)
1588	<	return val;
1589	<	break;
1590	<	}
1591	<	}
1592	<	else
1593	<	tab = (Node[])fk;
1594	<	}
1595	<	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1596	<	((fk = f.key) == k || k.equals(fk)))
1597	<	return fv;
1598	<	else {
1599	<	Node g = f.next;
1600	<	if (g != null) {
1601	<	for (Node e = g;;) {
1602	<	Object ek, ev;
1603	<	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1604	<	((ek = e.key) == k || k.equals(ek)))
1605	<	return ev;
1606	<	if ((e = e.next) == null) {
1607	<	checkForResize();
1608	<	break;
1609	<	}
1610	<	}
1611	<	}
1612	<	if (((fh = f.hash) & LOCKED) != 0) {
1613	<	checkForResize();
1614	<	f.tryAwaitLock(tab, i);
1615	<	}
1616	<	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1617	<	boolean added = false;
1618	<	try {
1619	<	if (tabAt(tab, i) == f) {
1620	<	count = 1;
1621	<	for (Node e = f;; ++count) {
1622	<	Object ek, ev;
1623	<	if ((e.hash & HASH_BITS) == h &&
1624	<	(ev = e.val) != null &&
1625	<	((ek = e.key) == k || k.equals(ek))) {
1626	<	val = ev;
1627	<	break;
1628	<	}
1629	<	Node last = e;
1630	<	if ((e = e.next) == null) {
1631	<	if ((val = mf.apply(k)) != null) {
1632	<	added = true;
1633	<	last.next = new Node(h, k, val, null);
1634	<	if (count >= TREE_THRESHOLD)
1635	<	replaceWithTreeBin(tab, i, k);
1636	<	}
1637	<	break;
1638	<	}
1639	<	}
1640	<	}
1641	<	} finally {
1642	<	if (!f.casHash(fh | LOCKED, fh)) {
1643	<	f.hash = fh;
1644	<	synchronized (f) { f.notifyAll(); };
1645	<	}
1646	<	}
1647	<	if (count != 0) {
1648	<	if (!added)
1649	<	return val;
1650	<	if (tab.length <= 64)
1651	<	count = 2;
1652	<	break;
1653	<	}
1654	<	}
1655	<	}
1656	<	}
1657	<	if (val != null) {
1658	<	counter.add(1L);
1659	<	if (count > 1)
1660	<	checkForResize();
1661	<	}
1662	<	return val;
1663	<	}
1664	<
1665	<	/** Implementation for compute */
1666	<	@SuppressWarnings("unchecked") private final Object internalCompute
1667	<	(K k, boolean onlyIfPresent, BiFun<? super K, ? super V, ? extends V> mf) {
1668	<	int h = spread(k.hashCode());
1669	<	Object val = null;
1670	<	int delta = 0;
1671	<	int count = 0;
1672	<	for (Node[] tab = table;;) {
1673	<	Node f; int i, fh; Object fk;
1674	<	if (tab == null)
1675	<	tab = initTable();
1676	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1677	<	if (onlyIfPresent)
1678	<	break;
1679	<	Node node = new Node(fh = h | LOCKED, k, null, null);
1680	<	if (casTabAt(tab, i, null, node)) {
1681	<	try {
1682	<	count = 1;
1683	<	if ((val = mf.apply(k, null)) != null) {
1684	<	node.val = val;
1685	<	delta = 1;
1686	<	}
1687	<	} finally {
1688	<	if (delta == 0)
1689	<	setTabAt(tab, i, null);
1690	<	if (!node.casHash(fh, h)) {
1691	<	node.hash = h;
1692	<	synchronized (node) { node.notifyAll(); };
1693	<	}
1694	<	}
1695	<	}
1696	<	if (count != 0)
1697	<	break;
1698	<	}
1699	<	else if ((fh = f.hash) == MOVED) {
1700	<	if ((fk = f.key) instanceof TreeBin) {
1701	<	TreeBin t = (TreeBin)fk;
1702	<	t.acquire(0);
1703	<	try {
1704	<	if (tabAt(tab, i) == f) {
1705	<	count = 1;
1706	<	TreeNode p = t.getTreeNode(h, k, t.root);
1707	<	Object pv = (p == null) ? null : p.val;
1708	<	if ((val = mf.apply(k, (V)pv)) != null) {
1709	<	if (p != null)
1710	<	p.val = val;
1711	<	else {
1712	<	count = 2;
1713	<	delta = 1;
1714	<	t.putTreeNode(h, k, val);
1715	<	}
1716	<	}
1717	<	else if (p != null) {
1718	<	delta = -1;
1719	<	t.deleteTreeNode(p);
1720	<	}
1721	<	}
1722	<	} finally {
1723	<	t.release(0);
1724	<	}
1725	<	if (count != 0)
1726	<	break;
1727	<	}
1728	<	else
1729	<	tab = (Node[])fk;
1730	<	}
1731	<	else if ((fh & LOCKED) != 0) {
1732	<	checkForResize();
1733	<	f.tryAwaitLock(tab, i);
1734	<	}
1735	<	else if (f.casHash(fh, fh | LOCKED)) {
1736	<	try {
1737	<	if (tabAt(tab, i) == f) {
1738	<	count = 1;
1739	<	for (Node e = f, pred = null;; ++count) {
1740	<	Object ek, ev;
1741	<	if ((e.hash & HASH_BITS) == h &&
1742	<	(ev = e.val) != null &&
1743	<	((ek = e.key) == k || k.equals(ek))) {
1744	<	val = mf.apply(k, (V)ev);
1745	<	if (val != null)
1746	<	e.val = val;
1747	<	else {
1748	<	delta = -1;
1749	<	Node en = e.next;
1750	<	if (pred != null)
1751	<	pred.next = en;
1752	<	else
1753	<	setTabAt(tab, i, en);
1754	<	}
1755	<	break;
1756	<	}
1757	<	pred = e;
1758	<	if ((e = e.next) == null) {
1759	<	if (!onlyIfPresent && (val = mf.apply(k, null)) != null) {
1760	<	pred.next = new Node(h, k, val, null);
1761	<	delta = 1;
1762	<	if (count >= TREE_THRESHOLD)
1763	<	replaceWithTreeBin(tab, i, k);
1764	<	}
1765	<	break;
1766	<	}
1767	<	}
1768	<	}
1769	<	} finally {
1770	<	if (!f.casHash(fh | LOCKED, fh)) {
1771	<	f.hash = fh;
1772	<	synchronized (f) { f.notifyAll(); };
1773	<	}
1774	<	}
1775	<	if (count != 0) {
1776	<	if (tab.length <= 64)
1777	<	count = 2;
1778	<	break;
1779	<	}
1780	<	}
1781	<	}
1782	<	if (delta != 0) {
1783	<	counter.add((long)delta);
1784	<	if (count > 1)
1785	<	checkForResize();
1786	<	}
1787	<	return val;
1788	<	}
1789	<
1790	<	/** Implementation for merge */
1791	<	@SuppressWarnings("unchecked") private final Object internalMerge
1792	<	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
1793	<	int h = spread(k.hashCode());
1794	<	Object val = null;
1795	<	int delta = 0;
1796	<	int count = 0;
1797	<	for (Node[] tab = table;;) {
1798	<	int i; Node f; int fh; Object fk, fv;
1799	<	if (tab == null)
1800	<	tab = initTable();
1801	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1802	<	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1803	<	delta = 1;
1804	<	val = v;
1805	<	break;
1806	<	}
1807	<	}
1808	<	else if ((fh = f.hash) == MOVED) {
1809	<	if ((fk = f.key) instanceof TreeBin) {
1810	<	TreeBin t = (TreeBin)fk;
1811	<	t.acquire(0);
1812	<	try {
1813	<	if (tabAt(tab, i) == f) {
1814	<	count = 1;
1815	<	TreeNode p = t.getTreeNode(h, k, t.root);
1816	<	val = (p == null) ? v : mf.apply((V)p.val, v);
1817	<	if (val != null) {
1818	<	if (p != null)
1819	<	p.val = val;
1820	<	else {
1821	<	count = 2;
1822	<	delta = 1;
1823	<	t.putTreeNode(h, k, val);
1824	<	}
1825	<	}
1826	<	else if (p != null) {
1827	<	delta = -1;
1828	<	t.deleteTreeNode(p);
1829	<	}
1830	<	}
1831	<	} finally {
1832	<	t.release(0);
1833	<	}
1834	<	if (count != 0)
1835	<	break;
1836	<	}
1837	<	else
1838	<	tab = (Node[])fk;
1839	<	}
1840	<	else if ((fh & LOCKED) != 0) {
1841	<	checkForResize();
1842	<	f.tryAwaitLock(tab, i);
1843	<	}
1844	<	else if (f.casHash(fh, fh | LOCKED)) {
1845	<	try {
1846	<	if (tabAt(tab, i) == f) {
1847	<	count = 1;
1848	<	for (Node e = f, pred = null;; ++count) {
1849	<	Object ek, ev;
1850	<	if ((e.hash & HASH_BITS) == h &&
1851	<	(ev = e.val) != null &&
1852	<	((ek = e.key) == k || k.equals(ek))) {
1853	<	val = mf.apply(v, (V)ev);
1854	<	if (val != null)
1855	<	e.val = val;
1856	<	else {
1857	<	delta = -1;
1858	<	Node en = e.next;
1859	<	if (pred != null)
1860	<	pred.next = en;
1861	<	else
1862	<	setTabAt(tab, i, en);
1863	<	}
1864	<	break;
1865	<	}
1866	<	pred = e;
1867	<	if ((e = e.next) == null) {
1868	<	val = v;
1869	<	pred.next = new Node(h, k, val, null);
1870	<	delta = 1;
1871	<	if (count >= TREE_THRESHOLD)
1872	<	replaceWithTreeBin(tab, i, k);
1873	<	break;
1874	<	}
1875	<	}
1876	<	}
1877	<	} finally {
1878	<	if (!f.casHash(fh | LOCKED, fh)) {
1879	<	f.hash = fh;
1880	<	synchronized (f) { f.notifyAll(); };
1881	<	}
1882	<	}
1883	<	if (count != 0) {
1884	<	if (tab.length <= 64)
1885	<	count = 2;
1886	<	break;
1887	<	}
1888	<	}
1889	<	}
1890	<	if (delta != 0) {
1891	<	counter.add((long)delta);
1892	<	if (count > 1)
1893	<	checkForResize();
1894	<	}
1895	<	return val;
1896	<	}
1897	<
1898	<	/** Implementation for putAll */
1899	<	private final void internalPutAll(Map<?, ?> m) {
1900	<	tryPresize(m.size());
1901	<	long delta = 0L;     // number of uncommitted additions
1902	<	boolean npe = false; // to throw exception on exit for nulls
1903	<	try {                // to clean up counts on other exceptions
1904	<	for (Map.Entry<?, ?> entry : m.entrySet()) {
1905	<	Object k, v;
1906	<	if (entry == null || (k = entry.getKey()) == null ||
1907	<	(v = entry.getValue()) == null) {
1908	<	npe = true;
1909	<	break;
1910	<	}
1911	<	int h = spread(k.hashCode());
1912	<	for (Node[] tab = table;;) {
1913	<	int i; Node f; int fh; Object fk;
1914	<	if (tab == null)
1915	<	tab = initTable();
1916	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
1917	<	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1918	<	++delta;
1919	<	break;
1920	<	}
1921	<	}
1922	<	else if ((fh = f.hash) == MOVED) {
1923	<	if ((fk = f.key) instanceof TreeBin) {
1924	<	TreeBin t = (TreeBin)fk;
1925	<	boolean validated = false;
1926	<	t.acquire(0);
1927	<	try {
1928	<	if (tabAt(tab, i) == f) {
1929	<	validated = true;
1930	<	TreeNode p = t.getTreeNode(h, k, t.root);
1931	<	if (p != null)
1932	<	p.val = v;
1933	<	else {
1934	<	t.putTreeNode(h, k, v);
1935	<	++delta;
1936	<	}
1937	<	}
1938	<	} finally {
1939	<	t.release(0);
1940	<	}
1941	<	if (validated)
1942	<	break;
1943	<	}
1944	<	else
1945	<	tab = (Node[])fk;
1946	<	}
1947	<	else if ((fh & LOCKED) != 0) {
1948	<	counter.add(delta);
1949	<	delta = 0L;
1950	<	checkForResize();
1951	<	f.tryAwaitLock(tab, i);
1952	<	}
1953	<	else if (f.casHash(fh, fh | LOCKED)) {
1954	<	int count = 0;
1955	<	try {
1956	<	if (tabAt(tab, i) == f) {
1957	<	count = 1;
1958	<	for (Node e = f;; ++count) {
1959	<	Object ek, ev;
1960	<	if ((e.hash & HASH_BITS) == h &&
1961	<	(ev = e.val) != null &&
1962	<	((ek = e.key) == k || k.equals(ek))) {
1963	<	e.val = v;
1964	<	break;
1965	<	}
1966	<	Node last = e;
1967	<	if ((e = e.next) == null) {
1968	<	++delta;
1969	<	last.next = new Node(h, k, v, null);
1970	<	if (count >= TREE_THRESHOLD)
1971	<	replaceWithTreeBin(tab, i, k);
1972	<	break;
1973	<	}
1974	<	}
1975	<	}
1976	<	} finally {
1977	<	if (!f.casHash(fh | LOCKED, fh)) {
1978	<	f.hash = fh;
1979	<	synchronized (f) { f.notifyAll(); };
1980	<	}
1981	<	}
1982	<	if (count != 0) {
1983	<	if (count > 1) {
1984	<	counter.add(delta);
1985	<	delta = 0L;
1986	<	checkForResize();
1987	<	}
1988	<	break;
1989	<	}
1990	<	}
1991	<	}
1992	<	}
1993	<	} finally {
1994	<	if (delta != 0)
1995	<	counter.add(delta);
1996	<	}
1997	<	if (npe)
1998	<	throw new NullPointerException();
661	>	static final int spread(int h) {
662	>	return (h ^ (h >>> 16)) & HASH_BITS;
663		}
664
2001	–	/* ---------------- Table Initialization and Resizing -------------- */
2002	–
665		/**
666		* Returns a power of two table size for the given desired capacity.
667		* See Hackers Delight, sec 3.2
#	Line 2015 | Line 677 | public class ConcurrentHashMapV8<K, V>
677		}
678
679		/**
680	<	* Initializes table, using the size recorded in sizeCtl.
680	>	* Returns x's Class if it is of the form "class C implements
681	>	* Comparable<C>", else null.
682		*/
683	<	private final Node[] initTable() {
684	<	Node[] tab; int sc;
685	<	while ((tab = table) == null) {
686	<	if ((sc = sizeCtl) < 0)
687	<	Thread.yield(); // lost initialization race; just spin
688	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
689	<	try {
690	<	if ((tab = table) == null) {
691	<	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
692	<	tab = table = new Node[n];
693	<	sc = n - (n >>> 2);
694	<	}
695	<	} finally {
2033	<	sizeCtl = sc;
2034	<	}
2035	<	break;
2036	<	}
2037	<	}
2038	<	return tab;
2039	<	}
2040	<
2041	<	/**
2042	<	* If table is too small and not already resizing, creates next
2043	<	* table and transfers bins.  Rechecks occupancy after a transfer
2044	<	* to see if another resize is already needed because resizings
2045	<	* are lagging additions.
2046	<	*/
2047	<	private final void checkForResize() {
2048	<	Node[] tab; int n, sc;
2049	<	while ((tab = table) != null &&
2050	<	(n = tab.length) < MAXIMUM_CAPACITY &&
2051	<	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
2052	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2053	<	try {
2054	<	if (tab == table) {
2055	<	table = rebuild(tab);
2056	<	sc = (n << 1) - (n >>> 1);
683	>	static Class<?> comparableClassFor(Object x) {
684	>	if (x instanceof Comparable) {
685	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
686	>	if ((c = x.getClass()) == String.class) // bypass checks
687	>	return c;
688	>	if ((ts = c.getGenericInterfaces()) != null) {
689	>	for (int i = 0; i < ts.length; ++i) {
690	>	if (((t = ts[i]) instanceof ParameterizedType) &&
691	>	((p = (ParameterizedType)t).getRawType() ==
692	>	Comparable.class) &&
693	>	(as = p.getActualTypeArguments()) != null &&
694	>	as.length == 1 && as[0] == c) // type arg is c
695	>	return c;
696		}
2058	–	} finally {
2059	–	sizeCtl = sc;
697		}
698		}
699	+	return null;
700		}
701
702		/**
703	<	* Tries to presize table to accommodate the given number of elements.
704	<	*
2067	<	* @param size number of elements (doesn't need to be perfectly accurate)
703	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
704	>	* class), else 0.
705		*/
706	<	private final void tryPresize(int size) {
707	<	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
708	<	tableSizeFor(size + (size >>> 1) + 1);
709	<	int sc;
2073	<	while ((sc = sizeCtl) >= 0) {
2074	<	Node[] tab = table; int n;
2075	<	if (tab == null || (n = tab.length) == 0) {
2076	<	n = (sc > c) ? sc : c;
2077	<	if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2078	<	try {
2079	<	if (table == tab) {
2080	<	table = new Node[n];
2081	<	sc = n - (n >>> 2);
2082	<	}
2083	<	} finally {
2084	<	sizeCtl = sc;
2085	<	}
2086	<	}
2087	<	}
2088	<	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2089	<	break;
2090	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2091	<	try {
2092	<	if (table == tab) {
2093	<	table = rebuild(tab);
2094	<	sc = (n << 1) - (n >>> 1);
2095	<	}
2096	<	} finally {
2097	<	sizeCtl = sc;
2098	<	}
2099	<	}
2100	<	}
706	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
707	>	static int compareComparables(Class<?> kc, Object k, Object x) {
708	>	return (x == null || x.getClass() != kc ? 0 :
709	>	((Comparable)k).compareTo(x));
710		}
711
712	+	/* ---------------- Table element access -------------- */
713	+
714		/*
715	<	* Moves and/or copies the nodes in each bin to new table. See
716	<	* above for explanation.
717	<	*
718	<	* @return the new table
719	<	*/
720	<	private static final Node[] rebuild(Node[] tab) {
721	<	int n = tab.length;
722	<	Node[] nextTab = new Node[n << 1];
723	<	Node fwd = new Node(MOVED, nextTab, null, null);
724	<	int[] buffer = null;       // holds bins to revisit; null until needed
725	<	Node rev = null;           // reverse forwarder; null until needed
726	<	int nbuffered = 0;         // the number of bins in buffer list
727	<	int bufferIndex = 0;       // buffer index of current buffered bin
728	<	int bin = n - 1;           // current non-buffered bin or -1 if none
729	<
730	<	for (int i = bin;;) {      // start upwards sweep
731	<	int fh; Node f;
732	<	if ((f = tabAt(tab, i)) == null) {
733	<	if (bin >= 0) {    // Unbuffered; no lock needed (or available)
734	<	if (!casTabAt(tab, i, f, fwd))
735	<	continue;
736	<	}
737	<	else {             // transiently use a locked forwarding node
738	<	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
739	<	if (!casTabAt(tab, i, f, g))
740	<	continue;
2130	<	setTabAt(nextTab, i, null);
2131	<	setTabAt(nextTab, i + n, null);
2132	<	setTabAt(tab, i, fwd);
2133	<	if (!g.casHash(MOVED|LOCKED, MOVED)) {
2134	<	g.hash = MOVED;
2135	<	synchronized (g) { g.notifyAll(); }
2136	<	}
2137	<	}
2138	<	}
2139	<	else if ((fh = f.hash) == MOVED) {
2140	<	Object fk = f.key;
2141	<	if (fk instanceof TreeBin) {
2142	<	TreeBin t = (TreeBin)fk;
2143	<	boolean validated = false;
2144	<	t.acquire(0);
2145	<	try {
2146	<	if (tabAt(tab, i) == f) {
2147	<	validated = true;
2148	<	splitTreeBin(nextTab, i, t);
2149	<	setTabAt(tab, i, fwd);
2150	<	}
2151	<	} finally {
2152	<	t.release(0);
2153	<	}
2154	<	if (!validated)
2155	<	continue;
2156	<	}
2157	<	}
2158	<	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
2159	<	boolean validated = false;
2160	<	try {              // split to lo and hi lists; copying as needed
2161	<	if (tabAt(tab, i) == f) {
2162	<	validated = true;
2163	<	splitBin(nextTab, i, f);
2164	<	setTabAt(tab, i, fwd);
2165	<	}
2166	<	} finally {
2167	<	if (!f.casHash(fh | LOCKED, fh)) {
2168	<	f.hash = fh;
2169	<	synchronized (f) { f.notifyAll(); };
2170	<	}
2171	<	}
2172	<	if (!validated)
2173	<	continue;
2174	<	}
2175	<	else {
2176	<	if (buffer == null) // initialize buffer for revisits
2177	<	buffer = new int[TRANSFER_BUFFER_SIZE];
2178	<	if (bin < 0 && bufferIndex > 0) {
2179	<	int j = buffer[--bufferIndex];
2180	<	buffer[bufferIndex] = i;
2181	<	i = j;         // swap with another bin
2182	<	continue;
2183	<	}
2184	<	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
2185	<	f.tryAwaitLock(tab, i);
2186	<	continue;      // no other options -- block
2187	<	}
2188	<	if (rev == null)   // initialize reverse-forwarder
2189	<	rev = new Node(MOVED, tab, null, null);
2190	<	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
2191	<	continue;      // recheck before adding to list
2192	<	buffer[nbuffered++] = i;
2193	<	setTabAt(nextTab, i, rev);     // install place-holders
2194	<	setTabAt(nextTab, i + n, rev);
2195	<	}
2196	<
2197	<	if (bin > 0)
2198	<	i = --bin;
2199	<	else if (buffer != null && nbuffered > 0) {
2200	<	bin = -1;
2201	<	i = buffer[bufferIndex = --nbuffered];
2202	<	}
2203	<	else
2204	<	return nextTab;
2205	<	}
715	>	* Volatile access methods are used for table elements as well as
716	>	* elements of in-progress next table while resizing.  All uses of
717	>	* the tab arguments must be null checked by callers.  All callers
718	>	* also paranoically precheck that tab's length is not zero (or an
719	>	* equivalent check), thus ensuring that any index argument taking
720	>	* the form of a hash value anded with (length - 1) is a valid
721	>	* index.  Note that, to be correct wrt arbitrary concurrency
722	>	* errors by users, these checks must operate on local variables,
723	>	* which accounts for some odd-looking inline assignments below.
724	>	* Note that calls to setTabAt always occur within locked regions,
725	>	* and so do not need full volatile semantics, but still require
726	>	* ordering to maintain concurrent readability.
727	>	*/
728	>
729	>	@SuppressWarnings("unchecked")
730	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
731	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
732	>	}
733	>
734	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
735	>	Node<K,V> c, Node<K,V> v) {
736	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
737	>	}
738	>
739	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
740	>	U.putOrderedObject(tab, ((long)i << ASHIFT) + ABASE, v);
741		}
742	+
743	+	/* ---------------- Fields -------------- */
744
745		/**
746	<	* Splits a normal bin with list headed by e into lo and hi parts;
747	<	* installs in given table.
746	>	* The array of bins. Lazily initialized upon first insertion.
747	>	* Size is always a power of two. Accessed directly by iterators.
748		*/
749	<	private static void splitBin(Node[] nextTab, int i, Node e) {
2213	<	int bit = nextTab.length >>> 1; // bit to split on
2214	<	int runBit = e.hash & bit;
2215	<	Node lastRun = e, lo = null, hi = null;
2216	<	for (Node p = e.next; p != null; p = p.next) {
2217	<	int b = p.hash & bit;
2218	<	if (b != runBit) {
2219	<	runBit = b;
2220	<	lastRun = p;
2221	<	}
2222	<	}
2223	<	if (runBit == 0)
2224	<	lo = lastRun;
2225	<	else
2226	<	hi = lastRun;
2227	<	for (Node p = e; p != lastRun; p = p.next) {
2228	<	int ph = p.hash & HASH_BITS;
2229	<	Object pk = p.key, pv = p.val;
2230	<	if ((ph & bit) == 0)
2231	<	lo = new Node(ph, pk, pv, lo);
2232	<	else
2233	<	hi = new Node(ph, pk, pv, hi);
2234	<	}
2235	<	setTabAt(nextTab, i, lo);
2236	<	setTabAt(nextTab, i + bit, hi);
2237	<	}
749	>	transient volatile Node<K,V>[] table;
750
751		/**
752	<	* Splits a tree bin into lo and hi parts; installs in given table.
752	>	* The next table to use; non-null only while resizing.
753		*/
754	<	private static void splitTreeBin(Node[] nextTab, int i, TreeBin t) {
2243	<	int bit = nextTab.length >>> 1;
2244	<	TreeBin lt = new TreeBin();
2245	<	TreeBin ht = new TreeBin();
2246	<	int lc = 0, hc = 0;
2247	<	for (Node e = t.first; e != null; e = e.next) {
2248	<	int h = e.hash & HASH_BITS;
2249	<	Object k = e.key, v = e.val;
2250	<	if ((h & bit) == 0) {
2251	<	++lc;
2252	<	lt.putTreeNode(h, k, v);
2253	<	}
2254	<	else {
2255	<	++hc;
2256	<	ht.putTreeNode(h, k, v);
2257	<	}
2258	<	}
2259	<	Node ln, hn; // throw away trees if too small
2260	<	if (lc <= (TREE_THRESHOLD >>> 1)) {
2261	<	ln = null;
2262	<	for (Node p = lt.first; p != null; p = p.next)
2263	<	ln = new Node(p.hash, p.key, p.val, ln);
2264	<	}
2265	<	else
2266	<	ln = new Node(MOVED, lt, null, null);
2267	<	setTabAt(nextTab, i, ln);
2268	<	if (hc <= (TREE_THRESHOLD >>> 1)) {
2269	<	hn = null;
2270	<	for (Node p = ht.first; p != null; p = p.next)
2271	<	hn = new Node(p.hash, p.key, p.val, hn);
2272	<	}
2273	<	else
2274	<	hn = new Node(MOVED, ht, null, null);
2275	<	setTabAt(nextTab, i + bit, hn);
2276	<	}
754	>	private transient volatile Node<K,V>[] nextTable;
755
756		/**
757	<	* Implementation for clear. Steps through each bin, removing all
758	<	* nodes.
757	>	* Base counter value, used mainly when there is no contention,
758	>	* but also as a fallback during table initialization
759	>	* races. Updated via CAS.
760		*/
761	<	private final void internalClear() {
2283	<	long delta = 0L; // negative number of deletions
2284	<	int i = 0;
2285	<	Node[] tab = table;
2286	<	while (tab != null && i < tab.length) {
2287	<	int fh; Object fk;
2288	<	Node f = tabAt(tab, i);
2289	<	if (f == null)
2290	<	++i;
2291	<	else if ((fh = f.hash) == MOVED) {
2292	<	if ((fk = f.key) instanceof TreeBin) {
2293	<	TreeBin t = (TreeBin)fk;
2294	<	t.acquire(0);
2295	<	try {
2296	<	if (tabAt(tab, i) == f) {
2297	<	for (Node p = t.first; p != null; p = p.next) {
2298	<	if (p.val != null) { // (currently always true)
2299	<	p.val = null;
2300	<	--delta;
2301	<	}
2302	<	}
2303	<	t.first = null;
2304	<	t.root = null;
2305	<	++i;
2306	<	}
2307	<	} finally {
2308	<	t.release(0);
2309	<	}
2310	<	}
2311	<	else
2312	<	tab = (Node[])fk;
2313	<	}
2314	<	else if ((fh & LOCKED) != 0) {
2315	<	counter.add(delta); // opportunistically update count
2316	<	delta = 0L;
2317	<	f.tryAwaitLock(tab, i);
2318	<	}
2319	<	else if (f.casHash(fh, fh | LOCKED)) {
2320	<	try {
2321	<	if (tabAt(tab, i) == f) {
2322	<	for (Node e = f; e != null; e = e.next) {
2323	<	if (e.val != null) {  // (currently always true)
2324	<	e.val = null;
2325	<	--delta;
2326	<	}
2327	<	}
2328	<	setTabAt(tab, i, null);
2329	<	++i;
2330	<	}
2331	<	} finally {
2332	<	if (!f.casHash(fh | LOCKED, fh)) {
2333	<	f.hash = fh;
2334	<	synchronized (f) { f.notifyAll(); };
2335	<	}
2336	<	}
2337	<	}
2338	<	}
2339	<	if (delta != 0)
2340	<	counter.add(delta);
2341	<	}
2342	<
2343	<	/* ----------------Table Traversal -------------- */
761	>	private transient volatile long baseCount;
762
763		/**
764	<	* Encapsulates traversal for methods such as containsValue; also
765	<	* serves as a base class for other iterators and bulk tasks.
766	<	*
767	<	* At each step, the iterator snapshots the key ("nextKey") and
768	<	* value ("nextVal") of a valid node (i.e., one that, at point of
769	<	* snapshot, has a non-null user value). Because val fields can
770	<	* change (including to null, indicating deletion), field nextVal
771	<	* might not be accurate at point of use, but still maintains the
2354	<	* weak consistency property of holding a value that was once
2355	<	* valid. To support iterator.remove, the nextKey field is not
2356	<	* updated (nulled out) when the iterator cannot advance.
2357	<	*
2358	<	* Internal traversals directly access these fields, as in:
2359	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2360	<	*
2361	<	* Exported iterators must track whether the iterator has advanced
2362	<	* (in hasNext vs next) (by setting/checking/nulling field
2363	<	* nextVal), and then extract key, value, or key-value pairs as
2364	<	* return values of next().
2365	<	*
2366	<	* The iterator visits once each still-valid node that was
2367	<	* reachable upon iterator construction. It might miss some that
2368	<	* were added to a bin after the bin was visited, which is OK wrt
2369	<	* consistency guarantees. Maintaining this property in the face
2370	<	* of possible ongoing resizes requires a fair amount of
2371	<	* bookkeeping state that is difficult to optimize away amidst
2372	<	* volatile accesses.  Even so, traversal maintains reasonable
2373	<	* throughput.
2374	<	*
2375	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2376	<	* However, if the table has been resized, then all future steps
2377	<	* must traverse both the bin at the current index as well as at
2378	<	* (index + baseSize); and so on for further resizings. To
2379	<	* paranoically cope with potential sharing by users of iterators
2380	<	* across threads, iteration terminates if a bounds checks fails
2381	<	* for a table read.
2382	<	*
2383	<	* This class extends ForkJoinTask to streamline parallel
2384	<	* iteration in bulk operations (see BulkTask). This adds only an
2385	<	* int of space overhead, which is close enough to negligible in
2386	<	* cases where it is not needed to not worry about it.  Because
2387	<	* ForkJoinTask is Serializable, but iterators need not be, we
2388	<	* need to add warning suppressions.
2389	<	*/
2390	<	@SuppressWarnings("serial") static class Traverser<K,V,R> extends ForkJoinTask<R> {
2391	<	final ConcurrentHashMapV8<K, V> map;
2392	<	Node next;           // the next entry to use
2393	<	Object nextKey;      // cached key field of next
2394	<	Object nextVal;      // cached val field of next
2395	<	Node[] tab;          // current table; updated if resized
2396	<	int index;           // index of bin to use next
2397	<	int baseIndex;       // current index of initial table
2398	<	int baseLimit;       // index bound for initial table
2399	<	int baseSize;        // initial table size
764	>	* Table initialization and resizing control.  When negative, the
765	>	* table is being initialized or resized: -1 for initialization,
766	>	* else -(1 + the number of active resizing threads).  Otherwise,
767	>	* when table is null, holds the initial table size to use upon
768	>	* creation, or 0 for default. After initialization, holds the
769	>	* next element count value upon which to resize the table.
770	>	*/
771	>	private transient volatile int sizeCtl;
772
773	<	/** Creates iterator for all entries in the table. */
774	<	Traverser(ConcurrentHashMapV8<K, V> map) {
775	<	this.map = map;
776	<	}
773	>	/**
774	>	* The next table index (plus one) to split while resizing.
775	>	*/
776	>	private transient volatile int transferIndex;
777
778	<	/** Creates iterator for split() methods */
779	<	Traverser(Traverser<K,V,?> it) {
780	<	ConcurrentHashMapV8<K, V> m; Node[] t;
781	<	if ((m = this.map = it.map) == null)
2410	<	t = null;
2411	<	else if ((t = it.tab) == null && // force parent tab initialization
2412	<	(t = it.tab = m.table) != null)
2413	<	it.baseLimit = it.baseSize = t.length;
2414	<	this.tab = t;
2415	<	this.baseSize = it.baseSize;
2416	<	it.baseLimit = this.index = this.baseIndex =
2417	<	((this.baseLimit = it.baseLimit) + it.baseIndex + 1) >>> 1;
2418	<	}
778	>	/**
779	>	* The least available table index to split while resizing.
780	>	*/
781	>	private transient volatile int transferOrigin;
782
783	<	/**
784	<	* Advances next; returns nextVal or null if terminated.
785	<	* See above for explanation.
786	<	*/
2424	<	final Object advance() {
2425	<	Node e = next;
2426	<	Object ev = null;
2427	<	outer: do {
2428	<	if (e != null)                  // advance past used/skipped node
2429	<	e = e.next;
2430	<	while (e == null) {             // get to next non-null bin
2431	<	ConcurrentHashMapV8<K, V> m;
2432	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2433	<	if ((t = tab) != null)
2434	<	n = t.length;
2435	<	else if ((m = map) != null && (t = tab = m.table) != null)
2436	<	n = baseLimit = baseSize = t.length;
2437	<	else
2438	<	break outer;
2439	<	if ((b = baseIndex) >= baseLimit ||
2440	<	(i = index) < 0 || i >= n)
2441	<	break outer;
2442	<	if ((e = tabAt(t, i)) != null && e.hash == MOVED) {
2443	<	if ((ek = e.key) instanceof TreeBin)
2444	<	e = ((TreeBin)ek).first;
2445	<	else {
2446	<	tab = (Node[])ek;
2447	<	continue;           // restarts due to null val
2448	<	}
2449	<	}                           // visit upper slots if present
2450	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2451	<	}
2452	<	nextKey = e.key;
2453	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2454	<	next = e;
2455	<	return nextVal = ev;
2456	<	}
783	>	/**
784	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
785	>	*/
786	>	private transient volatile int cellsBusy;
787
788	<	public final void remove() {
789	<	Object k = nextKey;
790	<	if (k == null && (advance() == null || (k = nextKey) == null))
791	<	throw new IllegalStateException();
2462	<	map.internalReplace(k, null, null);
2463	<	}
788	>	/**
789	>	* Table of counter cells. When non-null, size is a power of 2.
790	>	*/
791	>	private transient volatile CounterCell[] counterCells;
792
793	<	public final boolean hasNext() {
794	<	return nextVal != null || advance() != null;
795	<	}
793	>	// views
794	>	private transient KeySetView<K,V> keySet;
795	>	private transient ValuesView<K,V> values;
796	>	private transient EntrySetView<K,V> entrySet;
797
2469	–	public final boolean hasMoreElements() { return hasNext(); }
2470	–	public final void setRawResult(Object x) { }
2471	–	public R getRawResult() { return null; }
2472	–	public boolean exec() { return true; }
2473	–	}
798
799		/* ---------------- Public operations -------------- */
800
#	Line 2478 | Line 802 | public class ConcurrentHashMapV8<K, V>
802		* Creates a new, empty map with the default initial table size (16).
803		*/
804		public ConcurrentHashMapV8() {
2481	–	this.counter = new LongAdder();
805		}
806
807		/**
#	Line 2497 | Line 820 | public class ConcurrentHashMapV8<K, V>
820		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
821		MAXIMUM_CAPACITY :
822		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2500	–	this.counter = new LongAdder();
823		this.sizeCtl = cap;
824		}
825
#	Line 2507 | Line 829 | public class ConcurrentHashMapV8<K, V>
829		* @param m the map
830		*/
831		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2510	–	this.counter = new LongAdder();
832		this.sizeCtl = DEFAULT_CAPACITY;
833	<	internalPutAll(m);
833	>	putAll(m);
834		}
835
836		/**
#	Line 2550 | Line 871 | public class ConcurrentHashMapV8<K, V>
871		* nonpositive
872		*/
873		public ConcurrentHashMapV8(int initialCapacity,
874	<	float loadFactor, int concurrencyLevel) {
874	>	float loadFactor, int concurrencyLevel) {
875		if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
876		throw new IllegalArgumentException();
877		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
#	Line 2558 | Line 879 | public class ConcurrentHashMapV8<K, V>
879		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
880		int cap = (size >= (long)MAXIMUM_CAPACITY) ?
881		MAXIMUM_CAPACITY : tableSizeFor((int)size);
2561	–	this.counter = new LongAdder();
882		this.sizeCtl = cap;
883		}
884
885	<	/**
2566	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2567	<	* from the given type to {@code Boolean.TRUE}.
2568	<	*
2569	<	* @return the new set
2570	<	*/
2571	<	public static <K> KeySetView<K,Boolean> newKeySet() {
2572	<	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(),
2573	<	Boolean.TRUE);
2574	<	}
2575	<
2576	<	/**
2577	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2578	<	* from the given type to {@code Boolean.TRUE}.
2579	<	*
2580	<	* @param initialCapacity The implementation performs internal
2581	<	* sizing to accommodate this many elements.
2582	<	* @throws IllegalArgumentException if the initial capacity of
2583	<	* elements is negative
2584	<	* @return the new set
2585	<	*/
2586	<	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2587	<	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(initialCapacity),
2588	<	Boolean.TRUE);
2589	<	}
2590	<
2591	<	/**
2592	<	* {@inheritDoc}
2593	<	*/
2594	<	public boolean isEmpty() {
2595	<	return counter.sum() <= 0L; // ignore transient negative values
2596	<	}
885	>	// Original (since JDK1.2) Map methods
886
887		/**
888		* {@inheritDoc}
889		*/
890		public int size() {
891	<	long n = counter.sum();
891	>	long n = sumCount();
892		return ((n < 0L) ? 0 :
893		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
894		(int)n);
895		}
896
897		/**
898	<	* Returns the number of mappings. This method should be used
2610	<	* instead of {@link #size} because a ConcurrentHashMapV8 may
2611	<	* contain more mappings than can be represented as an int. The
2612	<	* value returned is a snapshot; the actual count may differ if
2613	<	* there are ongoing concurrent insertions or removals.
2614	<	*
2615	<	* @return the number of mappings
898	>	* {@inheritDoc}
899		*/
900	<	public long mappingCount() {
901	<	long n = counter.sum();
2619	<	return (n < 0L) ? 0L : n; // ignore transient negative values
900	>	public boolean isEmpty() {
901	>	return sumCount() <= 0L; // ignore transient negative values
902		}
903
904		/**
#	Line 2630 | Line 912 | public class ConcurrentHashMapV8<K, V>
912		*
913		* @throws NullPointerException if the specified key is null
914		*/
915	<	@SuppressWarnings("unchecked") public V get(Object key) {
916	<	if (key == null)
917	<	throw new NullPointerException();
918	<	return (V)internalGet(key);
919	<	}
920	<
921	<	/**
922	<	* Returns the value to which the specified key is mapped,
923	<	* or the given defaultValue if this map contains no mapping for the key.
924	<	*
925	<	* @param key the key
926	<	* @param defaultValue the value to return if this map contains
927	<	* no mapping for the given key
928	<	* @return the mapping for the key, if present; else the defaultValue
929	<	* @throws NullPointerException if the specified key is null
930	<	*/
931	<	@SuppressWarnings("unchecked") public V getValueOrDefault(Object key, V defaultValue) {
932	<	if (key == null)
2651	<	throw new NullPointerException();
2652	<	V v = (V) internalGet(key);
2653	<	return v == null ? defaultValue : v;
915	>	public V get(Object key) {
916	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
917	>	int h = spread(key.hashCode());
918	>	if ((tab = table) != null && (n = tab.length) > 0 &&
919	>	(e = tabAt(tab, (n - 1) & h)) != null) {
920	>	if ((eh = e.hash) == h) {
921	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
922	>	return e.val;
923	>	}
924	>	else if (eh < 0)
925	>	return (p = e.find(h, key)) != null ? p.val : null;
926	>	while ((e = e.next) != null) {
927	>	if (e.hash == h &&
928	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
929	>	return e.val;
930	>	}
931	>	}
932	>	return null;
933		}
934
935		/**
936		* Tests if the specified object is a key in this table.
937		*
938	<	* @param  key   possible key
938	>	* @param  key possible key
939		* @return {@code true} if and only if the specified object
940		*         is a key in this table, as determined by the
941		*         {@code equals} method; {@code false} otherwise
942		* @throws NullPointerException if the specified key is null
943		*/
944		public boolean containsKey(Object key) {
945	<	if (key == null)
2667	<	throw new NullPointerException();
2668	<	return internalGet(key) != null;
945	>	return get(key) != null;
946		}
947
948		/**
#	Line 2681 | Line 958 | public class ConcurrentHashMapV8<K, V>
958		public boolean containsValue(Object value) {
959		if (value == null)
960		throw new NullPointerException();
961	<	Object v;
962	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
963	<	while ((v = it.advance()) != null) {
964	<	if (v == value || value.equals(v))
965	<	return true;
961	>	Node<K,V>[] t;
962	>	if ((t = table) != null) {
963	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
964	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
965	>	V v;
966	>	if ((v = p.val) == value || (v != null && value.equals(v)))
967	>	return true;
968	>	}
969		}
970		return false;
971		}
972
973		/**
2694	–	* Legacy method testing if some key maps into the specified value
2695	–	* in this table.  This method is identical in functionality to
2696	–	* {@link #containsValue}, and exists solely to ensure
2697	–	* full compatibility with class {@link java.util.Hashtable},
2698	–	* which supported this method prior to introduction of the
2699	–	* Java Collections framework.
2700	–	*
2701	–	* @param  value a value to search for
2702	–	* @return {@code true} if and only if some key maps to the
2703	–	*         {@code value} argument in this table as
2704	–	*         determined by the {@code equals} method;
2705	–	*         {@code false} otherwise
2706	–	* @throws NullPointerException if the specified value is null
2707	–	*/
2708	–	public boolean contains(Object value) {
2709	–	return containsValue(value);
2710	–	}
2711	–
2712	–	/**
974		* Maps the specified key to the specified value in this table.
975		* Neither the key nor the value can be null.
976		*
#	Line 2722 | Line 983 | public class ConcurrentHashMapV8<K, V>
983		*         {@code null} if there was no mapping for {@code key}
984		* @throws NullPointerException if the specified key or value is null
985		*/
986	<	@SuppressWarnings("unchecked") public V put(K key, V value) {
987	<	if (key == null || value == null)
986	>	public V put(K key, V value) {
987	>	return putVal(key, value, false);
988	>	}
989	>
990	>	/** Implementation for put and putIfAbsent */
991	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
992	>	if (key == null || value == null) throw new NullPointerException();
993	>	int hash = spread(key.hashCode());
994	>	int binCount = 0;
995	>	for (Node<K,V>[] tab = table;;) {
996	>	Node<K,V> f; int n, i, fh;
997	>	if (tab == null || (n = tab.length) == 0)
998	>	tab = initTable();
999	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
1000	>	if (casTabAt(tab, i, null,
1001	>	new Node<K,V>(hash, key, value, null)))
1002	>	break;                   // no lock when adding to empty bin
1003	>	}
1004	>	else if ((fh = f.hash) == MOVED)
1005	>	tab = helpTransfer(tab, f);
1006	>	else {
1007	>	V oldVal = null;
1008	>	synchronized (f) {
1009	>	if (tabAt(tab, i) == f) {
1010	>	if (fh >= 0) {
1011	>	binCount = 1;
1012	>	for (Node<K,V> e = f;; ++binCount) {
1013	>	K ek;
1014	>	if (e.hash == hash &&
1015	>	((ek = e.key) == key ||
1016	>	(ek != null && key.equals(ek)))) {
1017	>	oldVal = e.val;
1018	>	if (!onlyIfAbsent)
1019	>	e.val = value;
1020	>	break;
1021	>	}
1022	>	Node<K,V> pred = e;
1023	>	if ((e = e.next) == null) {
1024	>	pred.next = new Node<K,V>(hash, key,
1025	>	value, null);
1026	>	break;
1027	>	}
1028	>	}
1029	>	}
1030	>	else if (f instanceof TreeBin) {
1031	>	Node<K,V> p;
1032	>	binCount = 2;
1033	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1034	>	value)) != null) {
1035	>	oldVal = p.val;
1036	>	if (!onlyIfAbsent)
1037	>	p.val = value;
1038	>	}
1039	>	}
1040	>	}
1041	>	}
1042	>	if (binCount != 0) {
1043	>	if (binCount >= TREEIFY_THRESHOLD)
1044	>	treeifyBin(tab, i);
1045	>	if (oldVal != null)
1046	>	return oldVal;
1047	>	break;
1048	>	}
1049	>	}
1050	>	}
1051	>	addCount(1L, binCount);
1052	>	return null;
1053	>	}
1054	>
1055	>	/**
1056	>	* Copies all of the mappings from the specified map to this one.
1057	>	* These mappings replace any mappings that this map had for any of the
1058	>	* keys currently in the specified map.
1059	>	*
1060	>	* @param m mappings to be stored in this map
1061	>	*/
1062	>	public void putAll(Map<? extends K, ? extends V> m) {
1063	>	tryPresize(m.size());
1064	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1065	>	putVal(e.getKey(), e.getValue(), false);
1066	>	}
1067	>
1068	>	/**
1069	>	* Removes the key (and its corresponding value) from this map.
1070	>	* This method does nothing if the key is not in the map.
1071	>	*
1072	>	* @param  key the key that needs to be removed
1073	>	* @return the previous value associated with {@code key}, or
1074	>	*         {@code null} if there was no mapping for {@code key}
1075	>	* @throws NullPointerException if the specified key is null
1076	>	*/
1077	>	public V remove(Object key) {
1078	>	return replaceNode(key, null, null);
1079	>	}
1080	>
1081	>	/**
1082	>	* Implementation for the four public remove/replace methods:
1083	>	* Replaces node value with v, conditional upon match of cv if
1084	>	* non-null.  If resulting value is null, delete.
1085	>	*/
1086	>	final V replaceNode(Object key, V value, Object cv) {
1087	>	int hash = spread(key.hashCode());
1088	>	for (Node<K,V>[] tab = table;;) {
1089	>	Node<K,V> f; int n, i, fh;
1090	>	if (tab == null || (n = tab.length) == 0 ||
1091	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1092	>	break;
1093	>	else if ((fh = f.hash) == MOVED)
1094	>	tab = helpTransfer(tab, f);
1095	>	else {
1096	>	V oldVal = null;
1097	>	boolean validated = false;
1098	>	synchronized (f) {
1099	>	if (tabAt(tab, i) == f) {
1100	>	if (fh >= 0) {
1101	>	validated = true;
1102	>	for (Node<K,V> e = f, pred = null;;) {
1103	>	K ek;
1104	>	if (e.hash == hash &&
1105	>	((ek = e.key) == key ||
1106	>	(ek != null && key.equals(ek)))) {
1107	>	V ev = e.val;
1108	>	if (cv == null || cv == ev ||
1109	>	(ev != null && cv.equals(ev))) {
1110	>	oldVal = ev;
1111	>	if (value != null)
1112	>	e.val = value;
1113	>	else if (pred != null)
1114	>	pred.next = e.next;
1115	>	else
1116	>	setTabAt(tab, i, e.next);
1117	>	}
1118	>	break;
1119	>	}
1120	>	pred = e;
1121	>	if ((e = e.next) == null)
1122	>	break;
1123	>	}
1124	>	}
1125	>	else if (f instanceof TreeBin) {
1126	>	validated = true;
1127	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1128	>	TreeNode<K,V> r, p;
1129	>	if ((r = t.root) != null &&
1130	>	(p = r.findTreeNode(hash, key, null)) != null) {
1131	>	V pv = p.val;
1132	>	if (cv == null || cv == pv ||
1133	>	(pv != null && cv.equals(pv))) {
1134	>	oldVal = pv;
1135	>	if (value != null)
1136	>	p.val = value;
1137	>	else if (t.removeTreeNode(p))
1138	>	setTabAt(tab, i, untreeify(t.first));
1139	>	}
1140	>	}
1141	>	}
1142	>	}
1143	>	}
1144	>	if (validated) {
1145	>	if (oldVal != null) {
1146	>	if (value == null)
1147	>	addCount(-1L, -1);
1148	>	return oldVal;
1149	>	}
1150	>	break;
1151	>	}
1152	>	}
1153	>	}
1154	>	return null;
1155	>	}
1156	>
1157	>	/**
1158	>	* Removes all of the mappings from this map.
1159	>	*/
1160	>	public void clear() {
1161	>	long delta = 0L; // negative number of deletions
1162	>	int i = 0;
1163	>	Node<K,V>[] tab = table;
1164	>	while (tab != null && i < tab.length) {
1165	>	int fh;
1166	>	Node<K,V> f = tabAt(tab, i);
1167	>	if (f == null)
1168	>	++i;
1169	>	else if ((fh = f.hash) == MOVED) {
1170	>	tab = helpTransfer(tab, f);
1171	>	i = 0; // restart
1172	>	}
1173	>	else {
1174	>	synchronized (f) {
1175	>	if (tabAt(tab, i) == f) {
1176	>	Node<K,V> p = (fh >= 0 ? f :
1177	>	(f instanceof TreeBin) ?
1178	>	((TreeBin<K,V>)f).first : null);
1179	>	while (p != null) {
1180	>	--delta;
1181	>	p = p.next;
1182	>	}
1183	>	setTabAt(tab, i++, null);
1184	>	}
1185	>	}
1186	>	}
1187	>	}
1188	>	if (delta != 0L)
1189	>	addCount(delta, -1);
1190	>	}
1191	>
1192	>	/**
1193	>	* Returns a {@link Set} view of the keys contained in this map.
1194	>	* The set is backed by the map, so changes to the map are
1195	>	* reflected in the set, and vice-versa. The set supports element
1196	>	* removal, which removes the corresponding mapping from this map,
1197	>	* via the {@code Iterator.remove}, {@code Set.remove},
1198	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1199	>	* operations.  It does not support the {@code add} or
1200	>	* {@code addAll} operations.
1201	>	*
1202	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1203	>	* that will never throw {@link ConcurrentModificationException},
1204	>	* and guarantees to traverse elements as they existed upon
1205	>	* construction of the iterator, and may (but is not guaranteed to)
1206	>	* reflect any modifications subsequent to construction.
1207	>	*
1208	>	* @return the set view
1209	>	*/
1210	>	public KeySetView<K,V> keySet() {
1211	>	KeySetView<K,V> ks;
1212	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1213	>	}
1214	>
1215	>	/**
1216	>	* Returns a {@link Collection} view of the values contained in this map.
1217	>	* The collection is backed by the map, so changes to the map are
1218	>	* reflected in the collection, and vice-versa.  The collection
1219	>	* supports element removal, which removes the corresponding
1220	>	* mapping from this map, via the {@code Iterator.remove},
1221	>	* {@code Collection.remove}, {@code removeAll},
1222	>	* {@code retainAll}, and {@code clear} operations.  It does not
1223	>	* support the {@code add} or {@code addAll} operations.
1224	>	*
1225	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1226	>	* that will never throw {@link ConcurrentModificationException},
1227	>	* and guarantees to traverse elements as they existed upon
1228	>	* construction of the iterator, and may (but is not guaranteed to)
1229	>	* reflect any modifications subsequent to construction.
1230	>	*
1231	>	* @return the collection view
1232	>	*/
1233	>	public Collection<V> values() {
1234	>	ValuesView<K,V> vs;
1235	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1236	>	}
1237	>
1238	>	/**
1239	>	* Returns a {@link Set} view of the mappings contained in this map.
1240	>	* The set is backed by the map, so changes to the map are
1241	>	* reflected in the set, and vice-versa.  The set supports element
1242	>	* removal, which removes the corresponding mapping from the map,
1243	>	* via the {@code Iterator.remove}, {@code Set.remove},
1244	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1245	>	* operations.
1246	>	*
1247	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1248	>	* that will never throw {@link ConcurrentModificationException},
1249	>	* and guarantees to traverse elements as they existed upon
1250	>	* construction of the iterator, and may (but is not guaranteed to)
1251	>	* reflect any modifications subsequent to construction.
1252	>	*
1253	>	* @return the set view
1254	>	*/
1255	>	public Set<Map.Entry<K,V>> entrySet() {
1256	>	EntrySetView<K,V> es;
1257	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1258	>	}
1259	>
1260	>	/**
1261	>	* Returns the hash code value for this {@link Map}, i.e.,
1262	>	* the sum of, for each key-value pair in the map,
1263	>	* {@code key.hashCode() ^ value.hashCode()}.
1264	>	*
1265	>	* @return the hash code value for this map
1266	>	*/
1267	>	public int hashCode() {
1268	>	int h = 0;
1269	>	Node<K,V>[] t;
1270	>	if ((t = table) != null) {
1271	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1272	>	for (Node<K,V> p; (p = it.advance()) != null; )
1273	>	h += p.key.hashCode() ^ p.val.hashCode();
1274	>	}
1275	>	return h;
1276	>	}
1277	>
1278	>	/**
1279	>	* Returns a string representation of this map.  The string
1280	>	* representation consists of a list of key-value mappings (in no
1281	>	* particular order) enclosed in braces ("{@code {}}").  Adjacent
1282	>	* mappings are separated by the characters {@code ", "} (comma
1283	>	* and space).  Each key-value mapping is rendered as the key
1284	>	* followed by an equals sign ("{@code =}") followed by the
1285	>	* associated value.
1286	>	*
1287	>	* @return a string representation of this map
1288	>	*/
1289	>	public String toString() {
1290	>	Node<K,V>[] t;
1291	>	int f = (t = table) == null ? 0 : t.length;
1292	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1293	>	StringBuilder sb = new StringBuilder();
1294	>	sb.append('{');
1295	>	Node<K,V> p;
1296	>	if ((p = it.advance()) != null) {
1297	>	for (;;) {
1298	>	K k = p.key;
1299	>	V v = p.val;
1300	>	sb.append(k == this ? "(this Map)" : k);
1301	>	sb.append('=');
1302	>	sb.append(v == this ? "(this Map)" : v);
1303	>	if ((p = it.advance()) == null)
1304	>	break;
1305	>	sb.append(',').append(' ');
1306	>	}
1307	>	}
1308	>	return sb.append('}').toString();
1309	>	}
1310	>
1311	>	/**
1312	>	* Compares the specified object with this map for equality.
1313	>	* Returns {@code true} if the given object is a map with the same
1314	>	* mappings as this map.  This operation may return misleading
1315	>	* results if either map is concurrently modified during execution
1316	>	* of this method.
1317	>	*
1318	>	* @param o object to be compared for equality with this map
1319	>	* @return {@code true} if the specified object is equal to this map
1320	>	*/
1321	>	public boolean equals(Object o) {
1322	>	if (o != this) {
1323	>	if (!(o instanceof Map))
1324	>	return false;
1325	>	Map<?,?> m = (Map<?,?>) o;
1326	>	Node<K,V>[] t;
1327	>	int f = (t = table) == null ? 0 : t.length;
1328	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1329	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1330	>	V val = p.val;
1331	>	Object v = m.get(p.key);
1332	>	if (v == null || (v != val && !v.equals(val)))
1333	>	return false;
1334	>	}
1335	>	for (Map.Entry<?,?> e : m.entrySet()) {
1336	>	Object mk, mv, v;
1337	>	if ((mk = e.getKey()) == null ||
1338	>	(mv = e.getValue()) == null ||
1339	>	(v = get(mk)) == null ||
1340	>	(mv != v && !mv.equals(v)))
1341	>	return false;
1342	>	}
1343	>	}
1344	>	return true;
1345	>	}
1346	>
1347	>	/**
1348	>	* Stripped-down version of helper class used in previous version,
1349	>	* declared for the sake of serialization compatibility
1350	>	*/
1351	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1352	>	private static final long serialVersionUID = 2249069246763182397L;
1353	>	final float loadFactor;
1354	>	Segment(float lf) { this.loadFactor = lf; }
1355	>	}
1356	>
1357	>	/**
1358	>	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
1359	>	* stream (i.e., serializes it).
1360	>	* @param s the stream
1361	>	* @serialData
1362	>	* the key (Object) and value (Object)
1363	>	* for each key-value mapping, followed by a null pair.
1364	>	* The key-value mappings are emitted in no particular order.
1365	>	*/
1366	>	private void writeObject(java.io.ObjectOutputStream s)
1367	>	throws java.io.IOException {
1368	>	// For serialization compatibility
1369	>	// Emulate segment calculation from previous version of this class
1370	>	int sshift = 0;
1371	>	int ssize = 1;
1372	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1373	>	++sshift;
1374	>	ssize <<= 1;
1375	>	}
1376	>	int segmentShift = 32 - sshift;
1377	>	int segmentMask = ssize - 1;
1378	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1379	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1380	>	for (int i = 0; i < segments.length; ++i)
1381	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1382	>	s.putFields().put("segments", segments);
1383	>	s.putFields().put("segmentShift", segmentShift);
1384	>	s.putFields().put("segmentMask", segmentMask);
1385	>	s.writeFields();
1386	>
1387	>	Node<K,V>[] t;
1388	>	if ((t = table) != null) {
1389	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1390	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1391	>	s.writeObject(p.key);
1392	>	s.writeObject(p.val);
1393	>	}
1394	>	}
1395	>	s.writeObject(null);
1396	>	s.writeObject(null);
1397	>	segments = null; // throw away
1398	>	}
1399	>
1400	>	/**
1401	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1402	>	* @param s the stream
1403	>	*/
1404	>	private void readObject(java.io.ObjectInputStream s)
1405	>	throws java.io.IOException, ClassNotFoundException {
1406	>	/*
1407	>	* To improve performance in typical cases, we create nodes
1408	>	* while reading, then place in table once size is known.
1409	>	* However, we must also validate uniqueness and deal with
1410	>	* overpopulated bins while doing so, which requires
1411	>	* specialized versions of putVal mechanics.
1412	>	*/
1413	>	sizeCtl = -1; // force exclusion for table construction
1414	>	s.defaultReadObject();
1415	>	long size = 0L;
1416	>	Node<K,V> p = null;
1417	>	for (;;) {
1418	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1419	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1420	>	if (k != null && v != null) {
1421	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1422	>	++size;
1423	>	}
1424	>	else
1425	>	break;
1426	>	}
1427	>	if (size == 0L)
1428	>	sizeCtl = 0;
1429	>	else {
1430	>	int n;
1431	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1432	>	n = MAXIMUM_CAPACITY;
1433	>	else {
1434	>	int sz = (int)size;
1435	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1436	>	}
1437	>	@SuppressWarnings({"rawtypes","unchecked"})
1438	>	Node<K,V>[] tab = (Node<K,V>[])new Node[n];
1439	>	int mask = n - 1;
1440	>	long added = 0L;
1441	>	while (p != null) {
1442	>	boolean insertAtFront;
1443	>	Node<K,V> next = p.next, first;
1444	>	int h = p.hash, j = h & mask;
1445	>	if ((first = tabAt(tab, j)) == null)
1446	>	insertAtFront = true;
1447	>	else {
1448	>	K k = p.key;
1449	>	if (first.hash < 0) {
1450	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1451	>	if (t.putTreeVal(h, k, p.val) == null)
1452	>	++added;
1453	>	insertAtFront = false;
1454	>	}
1455	>	else {
1456	>	int binCount = 0;
1457	>	insertAtFront = true;
1458	>	Node<K,V> q; K qk;
1459	>	for (q = first; q != null; q = q.next) {
1460	>	if (q.hash == h &&
1461	>	((qk = q.key) == k ||
1462	>	(qk != null && k.equals(qk)))) {
1463	>	insertAtFront = false;
1464	>	break;
1465	>	}
1466	>	++binCount;
1467	>	}
1468	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1469	>	insertAtFront = false;
1470	>	++added;
1471	>	p.next = first;
1472	>	TreeNode<K,V> hd = null, tl = null;
1473	>	for (q = p; q != null; q = q.next) {
1474	>	TreeNode<K,V> t = new TreeNode<K,V>
1475	>	(q.hash, q.key, q.val, null, null);
1476	>	if ((t.prev = tl) == null)
1477	>	hd = t;
1478	>	else
1479	>	tl.next = t;
1480	>	tl = t;
1481	>	}
1482	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1483	>	}
1484	>	}
1485	>	}
1486	>	if (insertAtFront) {
1487	>	++added;
1488	>	p.next = first;
1489	>	setTabAt(tab, j, p);
1490	>	}
1491	>	p = next;
1492	>	}
1493	>	table = tab;
1494	>	sizeCtl = n - (n >>> 2);
1495	>	baseCount = added;
1496	>	}
1497	>	}
1498	>
1499	>	// ConcurrentMap methods
1500	>
1501	>	/**
1502	>	* {@inheritDoc}
1503	>	*
1504	>	* @return the previous value associated with the specified key,
1505	>	*         or {@code null} if there was no mapping for the key
1506	>	* @throws NullPointerException if the specified key or value is null
1507	>	*/
1508	>	public V putIfAbsent(K key, V value) {
1509	>	return putVal(key, value, true);
1510	>	}
1511	>
1512	>	/**
1513	>	* {@inheritDoc}
1514	>	*
1515	>	* @throws NullPointerException if the specified key is null
1516	>	*/
1517	>	public boolean remove(Object key, Object value) {
1518	>	if (key == null)
1519	>	throw new NullPointerException();
1520	>	return value != null && replaceNode(key, null, value) != null;
1521	>	}
1522	>
1523	>	/**
1524	>	* {@inheritDoc}
1525	>	*
1526	>	* @throws NullPointerException if any of the arguments are null
1527	>	*/
1528	>	public boolean replace(K key, V oldValue, V newValue) {
1529	>	if (key == null || oldValue == null || newValue == null)
1530		throw new NullPointerException();
1531	<	return (V)internalPut(key, value);
1531	>	return replaceNode(key, newValue, oldValue) != null;
1532		}
1533
1534		/**
#	Line 2735 | Line 1538 | public class ConcurrentHashMapV8<K, V>
1538		*         or {@code null} if there was no mapping for the key
1539		* @throws NullPointerException if the specified key or value is null
1540		*/
1541	<	@SuppressWarnings("unchecked") public V putIfAbsent(K key, V value) {
1541	>	public V replace(K key, V value) {
1542		if (key == null || value == null)
1543		throw new NullPointerException();
1544	<	return (V)internalPutIfAbsent(key, value);
1544	>	return replaceNode(key, value, null);
1545		}
1546
1547	+	// Overrides of JDK8+ Map extension method defaults
1548	+
1549		/**
1550	<	* Copies all of the mappings from the specified map to this one.
1551	<	* These mappings replace any mappings that this map had for any of the
1552	<	* keys currently in the specified map.
1550	>	* Returns the value to which the specified key is mapped, or the
1551	>	* given default value if this map contains no mapping for the
1552	>	* key.
1553		*
1554	<	* @param m mappings to be stored in this map
1554	>	* @param key the key whose associated value is to be returned
1555	>	* @param defaultValue the value to return if this map contains
1556	>	* no mapping for the given key
1557	>	* @return the mapping for the key, if present; else the default value
1558	>	* @throws NullPointerException if the specified key is null
1559		*/
1560	<	public void putAll(Map<? extends K, ? extends V> m) {
1561	<	internalPutAll(m);
1560	>	public V getOrDefault(Object key, V defaultValue) {
1561	>	V v;
1562	>	return (v = get(key)) == null ? defaultValue : v;
1563	>	}
1564	>
1565	>	public void forEach(BiAction<? super K, ? super V> action) {
1566	>	if (action == null) throw new NullPointerException();
1567	>	Node<K,V>[] t;
1568	>	if ((t = table) != null) {
1569	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1570	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1571	>	action.apply(p.key, p.val);
1572	>	}
1573	>	}
1574	>	}
1575	>
1576	>	public void replaceAll(BiFun<? super K, ? super V, ? extends V> function) {
1577	>	if (function == null) throw new NullPointerException();
1578	>	Node<K,V>[] t;
1579	>	if ((t = table) != null) {
1580	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1581	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1582	>	V oldValue = p.val;
1583	>	for (K key = p.key;;) {
1584	>	V newValue = function.apply(key, oldValue);
1585	>	if (newValue == null)
1586	>	throw new NullPointerException();
1587	>	if (replaceNode(key, newValue, oldValue) != null ||
1588	>	(oldValue = get(key)) == null)
1589	>	break;
1590	>	}
1591	>	}
1592	>	}
1593		}
1594
1595		/**
1596		* If the specified key is not already associated with a value,
1597	<	* computes its value using the given mappingFunction and enters
1598	<	* it into the map unless null.  This is equivalent to
1599	<	* <pre> {@code
1600	<	* if (map.containsKey(key))
1601	<	*   return map.get(key);
1602	<	* value = mappingFunction.apply(key);
1603	<	* if (value != null)
2764	<	*   map.put(key, value);
2765	<	* return value;}</pre>
2766	<	*
2767	<	* except that the action is performed atomically.  If the
2768	<	* function returns {@code null} no mapping is recorded. If the
2769	<	* function itself throws an (unchecked) exception, the exception
2770	<	* is rethrown to its caller, and no mapping is recorded.  Some
2771	<	* attempted update operations on this map by other threads may be
2772	<	* blocked while computation is in progress, so the computation
2773	<	* should be short and simple, and must not attempt to update any
2774	<	* other mappings of this Map. The most appropriate usage is to
2775	<	* construct a new object serving as an initial mapped value, or
2776	<	* memoized result, as in:
2777	<	*
2778	<	*  <pre> {@code
2779	<	* map.computeIfAbsent(key, new Fun<K, V>() {
2780	<	*   public V map(K k) { return new Value(f(k)); }});}</pre>
1597	>	* attempts to compute its value using the given mapping function
1598	>	* and enters it into this map unless {@code null}.  The entire
1599	>	* method invocation is performed atomically, so the function is
1600	>	* applied at most once per key.  Some attempted update operations
1601	>	* on this map by other threads may be blocked while computation
1602	>	* is in progress, so the computation should be short and simple,
1603	>	* and must not attempt to update any other mappings of this map.
1604		*
1605		* @param key key with which the specified value is to be associated
1606		* @param mappingFunction the function to compute a value
#	Line 2791 | Line 1614 | public class ConcurrentHashMapV8<K, V>
1614		* @throws RuntimeException or Error if the mappingFunction does so,
1615		*         in which case the mapping is left unestablished
1616		*/
1617	<	@SuppressWarnings("unchecked") public V computeIfAbsent
2795	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
1617	>	public V computeIfAbsent(K key, Fun<? super K, ? extends V> mappingFunction) {
1618		if (key == null || mappingFunction == null)
1619		throw new NullPointerException();
1620	<	return (V)internalComputeIfAbsent(key, mappingFunction);
1620	>	int h = spread(key.hashCode());
1621	>	V val = null;
1622	>	int binCount = 0;
1623	>	for (Node<K,V>[] tab = table;;) {
1624	>	Node<K,V> f; int n, i, fh;
1625	>	if (tab == null || (n = tab.length) == 0)
1626	>	tab = initTable();
1627	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1628	>	Node<K,V> r = new ReservationNode<K,V>();
1629	>	synchronized (r) {
1630	>	if (casTabAt(tab, i, null, r)) {
1631	>	binCount = 1;
1632	>	Node<K,V> node = null;
1633	>	try {
1634	>	if ((val = mappingFunction.apply(key)) != null)
1635	>	node = new Node<K,V>(h, key, val, null);
1636	>	} finally {
1637	>	setTabAt(tab, i, node);
1638	>	}
1639	>	}
1640	>	}
1641	>	if (binCount != 0)
1642	>	break;
1643	>	}
1644	>	else if ((fh = f.hash) == MOVED)
1645	>	tab = helpTransfer(tab, f);
1646	>	else {
1647	>	boolean added = false;
1648	>	synchronized (f) {
1649	>	if (tabAt(tab, i) == f) {
1650	>	if (fh >= 0) {
1651	>	binCount = 1;
1652	>	for (Node<K,V> e = f;; ++binCount) {
1653	>	K ek; V ev;
1654	>	if (e.hash == h &&
1655	>	((ek = e.key) == key ||
1656	>	(ek != null && key.equals(ek)))) {
1657	>	val = e.val;
1658	>	break;
1659	>	}
1660	>	Node<K,V> pred = e;
1661	>	if ((e = e.next) == null) {
1662	>	if ((val = mappingFunction.apply(key)) != null) {
1663	>	added = true;
1664	>	pred.next = new Node<K,V>(h, key, val, null);
1665	>	}
1666	>	break;
1667	>	}
1668	>	}
1669	>	}
1670	>	else if (f instanceof TreeBin) {
1671	>	binCount = 2;
1672	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1673	>	TreeNode<K,V> r, p;
1674	>	if ((r = t.root) != null &&
1675	>	(p = r.findTreeNode(h, key, null)) != null)
1676	>	val = p.val;
1677	>	else if ((val = mappingFunction.apply(key)) != null) {
1678	>	added = true;
1679	>	t.putTreeVal(h, key, val);
1680	>	}
1681	>	}
1682	>	}
1683	>	}
1684	>	if (binCount != 0) {
1685	>	if (binCount >= TREEIFY_THRESHOLD)
1686	>	treeifyBin(tab, i);
1687	>	if (!added)
1688	>	return val;
1689	>	break;
1690	>	}
1691	>	}
1692	>	}
1693	>	if (val != null)
1694	>	addCount(1L, binCount);
1695	>	return val;
1696		}
1697
1698		/**
1699	<	* If the given key is present, computes a new mapping value given a key and
1700	<	* its current mapped value. This is equivalent to
1701	<	*  <pre> {@code
1702	<	*   if (map.containsKey(key)) {
1703	<	*     value = remappingFunction.apply(key, map.get(key));
1704	<	*     if (value != null)
1705	<	*       map.put(key, value);
2809	<	*     else
2810	<	*       map.remove(key);
2811	<	*   }
2812	<	* }</pre>
2813	<	*
2814	<	* except that the action is performed atomically.  If the
2815	<	* function returns {@code null}, the mapping is removed.  If the
2816	<	* function itself throws an (unchecked) exception, the exception
2817	<	* is rethrown to its caller, and the current mapping is left
2818	<	* unchanged.  Some attempted update operations on this map by
2819	<	* other threads may be blocked while computation is in progress,
2820	<	* so the computation should be short and simple, and must not
2821	<	* attempt to update any other mappings of this Map. For example,
2822	<	* to either create or append new messages to a value mapping:
1699	>	* If the value for the specified key is present, attempts to
1700	>	* compute a new mapping given the key and its current mapped
1701	>	* value.  The entire method invocation is performed atomically.
1702	>	* Some attempted update operations on this map by other threads
1703	>	* may be blocked while computation is in progress, so the
1704	>	* computation should be short and simple, and must not attempt to
1705	>	* update any other mappings of this map.
1706		*
1707	<	* @param key key with which the specified value is to be associated
1707	>	* @param key key with which a value may be associated
1708		* @param remappingFunction the function to compute a value
1709		* @return the new value associated with the specified key, or null if none
1710		* @throws NullPointerException if the specified key or remappingFunction
#	Line 2832 | Line 1715 | public class ConcurrentHashMapV8<K, V>
1715		* @throws RuntimeException or Error if the remappingFunction does so,
1716		*         in which case the mapping is unchanged
1717		*/
1718	<	@SuppressWarnings("unchecked") public V computeIfPresent
2836	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1718	>	public V computeIfPresent(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1719		if (key == null || remappingFunction == null)
1720		throw new NullPointerException();
1721	<	return (V)internalCompute(key, true, remappingFunction);
1721	>	int h = spread(key.hashCode());
1722	>	V val = null;
1723	>	int delta = 0;
1724	>	int binCount = 0;
1725	>	for (Node<K,V>[] tab = table;;) {
1726	>	Node<K,V> f; int n, i, fh;
1727	>	if (tab == null || (n = tab.length) == 0)
1728	>	tab = initTable();
1729	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1730	>	break;
1731	>	else if ((fh = f.hash) == MOVED)
1732	>	tab = helpTransfer(tab, f);
1733	>	else {
1734	>	synchronized (f) {
1735	>	if (tabAt(tab, i) == f) {
1736	>	if (fh >= 0) {
1737	>	binCount = 1;
1738	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1739	>	K ek;
1740	>	if (e.hash == h &&
1741	>	((ek = e.key) == key ||
1742	>	(ek != null && key.equals(ek)))) {
1743	>	val = remappingFunction.apply(key, e.val);
1744	>	if (val != null)
1745	>	e.val = val;
1746	>	else {
1747	>	delta = -1;
1748	>	Node<K,V> en = e.next;
1749	>	if (pred != null)
1750	>	pred.next = en;
1751	>	else
1752	>	setTabAt(tab, i, en);
1753	>	}
1754	>	break;
1755	>	}
1756	>	pred = e;
1757	>	if ((e = e.next) == null)
1758	>	break;
1759	>	}
1760	>	}
1761	>	else if (f instanceof TreeBin) {
1762	>	binCount = 2;
1763	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1764	>	TreeNode<K,V> r, p;
1765	>	if ((r = t.root) != null &&
1766	>	(p = r.findTreeNode(h, key, null)) != null) {
1767	>	val = remappingFunction.apply(key, p.val);
1768	>	if (val != null)
1769	>	p.val = val;
1770	>	else {
1771	>	delta = -1;
1772	>	if (t.removeTreeNode(p))
1773	>	setTabAt(tab, i, untreeify(t.first));
1774	>	}
1775	>	}
1776	>	}
1777	>	}
1778	>	}
1779	>	if (binCount != 0)
1780	>	break;
1781	>	}
1782	>	}
1783	>	if (delta != 0)
1784	>	addCount((long)delta, binCount);
1785	>	return val;
1786		}
1787
1788		/**
1789	<	* Computes a new mapping value given a key and
1790	<	* its current mapped value (or {@code null} if there is no current
1791	<	* mapping). This is equivalent to
1792	<	*  <pre> {@code
1793	<	*   value = remappingFunction.apply(key, map.get(key));
1794	<	*   if (value != null)
1795	<	*     map.put(key, value);
2850	<	*   else
2851	<	*     map.remove(key);
2852	<	* }</pre>
2853	<	*
2854	<	* except that the action is performed atomically.  If the
2855	<	* function returns {@code null}, the mapping is removed.  If the
2856	<	* function itself throws an (unchecked) exception, the exception
2857	<	* is rethrown to its caller, and the current mapping is left
2858	<	* unchanged.  Some attempted update operations on this map by
2859	<	* other threads may be blocked while computation is in progress,
2860	<	* so the computation should be short and simple, and must not
2861	<	* attempt to update any other mappings of this Map. For example,
2862	<	* to either create or append new messages to a value mapping:
2863	<	*
2864	<	* <pre> {@code
2865	<	* Map<Key, String> map = ...;
2866	<	* final String msg = ...;
2867	<	* map.compute(key, new BiFun<Key, String, String>() {
2868	<	*   public String apply(Key k, String v) {
2869	<	*    return (v == null) ? msg : v + msg;});}}</pre>
1789	>	* Attempts to compute a mapping for the specified key and its
1790	>	* current mapped value (or {@code null} if there is no current
1791	>	* mapping). The entire method invocation is performed atomically.
1792	>	* Some attempted update operations on this map by other threads
1793	>	* may be blocked while computation is in progress, so the
1794	>	* computation should be short and simple, and must not attempt to
1795	>	* update any other mappings of this Map.
1796		*
1797		* @param key key with which the specified value is to be associated
1798		* @param remappingFunction the function to compute a value
#	Line 2879 | Line 1805 | public class ConcurrentHashMapV8<K, V>
1805		* @throws RuntimeException or Error if the remappingFunction does so,
1806		*         in which case the mapping is unchanged
1807		*/
1808	<	@SuppressWarnings("unchecked") public V compute
1809	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1808	>	public V compute(K key,
1809	>	BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1810		if (key == null || remappingFunction == null)
1811		throw new NullPointerException();
1812	<	return (V)internalCompute(key, false, remappingFunction);
1812	>	int h = spread(key.hashCode());
1813	>	V val = null;
1814	>	int delta = 0;
1815	>	int binCount = 0;
1816	>	for (Node<K,V>[] tab = table;;) {
1817	>	Node<K,V> f; int n, i, fh;
1818	>	if (tab == null || (n = tab.length) == 0)
1819	>	tab = initTable();
1820	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1821	>	Node<K,V> r = new ReservationNode<K,V>();
1822	>	synchronized (r) {
1823	>	if (casTabAt(tab, i, null, r)) {
1824	>	binCount = 1;
1825	>	Node<K,V> node = null;
1826	>	try {
1827	>	if ((val = remappingFunction.apply(key, null)) != null) {
1828	>	delta = 1;
1829	>	node = new Node<K,V>(h, key, val, null);
1830	>	}
1831	>	} finally {
1832	>	setTabAt(tab, i, node);
1833	>	}
1834	>	}
1835	>	}
1836	>	if (binCount != 0)
1837	>	break;
1838	>	}
1839	>	else if ((fh = f.hash) == MOVED)
1840	>	tab = helpTransfer(tab, f);
1841	>	else {
1842	>	synchronized (f) {
1843	>	if (tabAt(tab, i) == f) {
1844	>	if (fh >= 0) {
1845	>	binCount = 1;
1846	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1847	>	K ek;
1848	>	if (e.hash == h &&
1849	>	((ek = e.key) == key ||
1850	>	(ek != null && key.equals(ek)))) {
1851	>	val = remappingFunction.apply(key, e.val);
1852	>	if (val != null)
1853	>	e.val = val;
1854	>	else {
1855	>	delta = -1;
1856	>	Node<K,V> en = e.next;
1857	>	if (pred != null)
1858	>	pred.next = en;
1859	>	else
1860	>	setTabAt(tab, i, en);
1861	>	}
1862	>	break;
1863	>	}
1864	>	pred = e;
1865	>	if ((e = e.next) == null) {
1866	>	val = remappingFunction.apply(key, null);
1867	>	if (val != null) {
1868	>	delta = 1;
1869	>	pred.next =
1870	>	new Node<K,V>(h, key, val, null);
1871	>	}
1872	>	break;
1873	>	}
1874	>	}
1875	>	}
1876	>	else if (f instanceof TreeBin) {
1877	>	binCount = 1;
1878	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1879	>	TreeNode<K,V> r, p;
1880	>	if ((r = t.root) != null)
1881	>	p = r.findTreeNode(h, key, null);
1882	>	else
1883	>	p = null;
1884	>	V pv = (p == null) ? null : p.val;
1885	>	val = remappingFunction.apply(key, pv);
1886	>	if (val != null) {
1887	>	if (p != null)
1888	>	p.val = val;
1889	>	else {
1890	>	delta = 1;
1891	>	t.putTreeVal(h, key, val);
1892	>	}
1893	>	}
1894	>	else if (p != null) {
1895	>	delta = -1;
1896	>	if (t.removeTreeNode(p))
1897	>	setTabAt(tab, i, untreeify(t.first));
1898	>	}
1899	>	}
1900	>	}
1901	>	}
1902	>	if (binCount != 0) {
1903	>	if (binCount >= TREEIFY_THRESHOLD)
1904	>	treeifyBin(tab, i);
1905	>	break;
1906	>	}
1907	>	}
1908	>	}
1909	>	if (delta != 0)
1910	>	addCount((long)delta, binCount);
1911	>	return val;
1912		}
1913
1914		/**
1915	<	* If the specified key is not already associated
1916	<	* with a value, associate it with the given value.
1917	<	* Otherwise, replace the value with the results of
1918	<	* the given remapping function. This is equivalent to:
1919	<	*  <pre> {@code
1920	<	*   if (!map.containsKey(key))
1921	<	*     map.put(value);
1922	<	*   else {
1923	<	*     newValue = remappingFunction.apply(map.get(key), value);
1924	<	*     if (value != null)
1925	<	*       map.put(key, value);
1926	<	*     else
1927	<	*       map.remove(key);
1928	<	*   }
1929	<	* }</pre>
1930	<	* except that the action is performed atomically.  If the
1931	<	* function returns {@code null}, the mapping is removed.  If the
1932	<	* function itself throws an (unchecked) exception, the exception
2908	<	* is rethrown to its caller, and the current mapping is left
2909	<	* unchanged.  Some attempted update operations on this map by
2910	<	* other threads may be blocked while computation is in progress,
2911	<	* so the computation should be short and simple, and must not
2912	<	* attempt to update any other mappings of this Map.
1915	>	* If the specified key is not already associated with a
1916	>	* (non-null) value, associates it with the given value.
1917	>	* Otherwise, replaces the value with the results of the given
1918	>	* remapping function, or removes if {@code null}. The entire
1919	>	* method invocation is performed atomically.  Some attempted
1920	>	* update operations on this map by other threads may be blocked
1921	>	* while computation is in progress, so the computation should be
1922	>	* short and simple, and must not attempt to update any other
1923	>	* mappings of this Map.
1924	>	*
1925	>	* @param key key with which the specified value is to be associated
1926	>	* @param value the value to use if absent
1927	>	* @param remappingFunction the function to recompute a value if present
1928	>	* @return the new value associated with the specified key, or null if none
1929	>	* @throws NullPointerException if the specified key or the
1930	>	*         remappingFunction is null
1931	>	* @throws RuntimeException or Error if the remappingFunction does so,
1932	>	*         in which case the mapping is unchanged
1933		*/
1934	<	@SuppressWarnings("unchecked") public V merge
2915	<	(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1934	>	public V merge(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1935		if (key == null || value == null || remappingFunction == null)
1936		throw new NullPointerException();
1937	<	return (V)internalMerge(key, value, remappingFunction);
1937	>	int h = spread(key.hashCode());
1938	>	V val = null;
1939	>	int delta = 0;
1940	>	int binCount = 0;
1941	>	for (Node<K,V>[] tab = table;;) {
1942	>	Node<K,V> f; int n, i, fh;
1943	>	if (tab == null || (n = tab.length) == 0)
1944	>	tab = initTable();
1945	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1946	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1947	>	delta = 1;
1948	>	val = value;
1949	>	break;
1950	>	}
1951	>	}
1952	>	else if ((fh = f.hash) == MOVED)
1953	>	tab = helpTransfer(tab, f);
1954	>	else {
1955	>	synchronized (f) {
1956	>	if (tabAt(tab, i) == f) {
1957	>	if (fh >= 0) {
1958	>	binCount = 1;
1959	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1960	>	K ek;
1961	>	if (e.hash == h &&
1962	>	((ek = e.key) == key ||
1963	>	(ek != null && key.equals(ek)))) {
1964	>	val = remappingFunction.apply(e.val, value);
1965	>	if (val != null)
1966	>	e.val = val;
1967	>	else {
1968	>	delta = -1;
1969	>	Node<K,V> en = e.next;
1970	>	if (pred != null)
1971	>	pred.next = en;
1972	>	else
1973	>	setTabAt(tab, i, en);
1974	>	}
1975	>	break;
1976	>	}
1977	>	pred = e;
1978	>	if ((e = e.next) == null) {
1979	>	delta = 1;
1980	>	val = value;
1981	>	pred.next =
1982	>	new Node<K,V>(h, key, val, null);
1983	>	break;
1984	>	}
1985	>	}
1986	>	}
1987	>	else if (f instanceof TreeBin) {
1988	>	binCount = 2;
1989	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1990	>	TreeNode<K,V> r = t.root;
1991	>	TreeNode<K,V> p = (r == null) ? null :
1992	>	r.findTreeNode(h, key, null);
1993	>	val = (p == null) ? value :
1994	>	remappingFunction.apply(p.val, value);
1995	>	if (val != null) {
1996	>	if (p != null)
1997	>	p.val = val;
1998	>	else {
1999	>	delta = 1;
2000	>	t.putTreeVal(h, key, val);
2001	>	}
2002	>	}
2003	>	else if (p != null) {
2004	>	delta = -1;
2005	>	if (t.removeTreeNode(p))
2006	>	setTabAt(tab, i, untreeify(t.first));
2007	>	}
2008	>	}
2009	>	}
2010	>	}
2011	>	if (binCount != 0) {
2012	>	if (binCount >= TREEIFY_THRESHOLD)
2013	>	treeifyBin(tab, i);
2014	>	break;
2015	>	}
2016	>	}
2017	>	}
2018	>	if (delta != 0)
2019	>	addCount((long)delta, binCount);
2020	>	return val;
2021		}
2022
2023	+	// Hashtable legacy methods
2024	+
2025		/**
2026	<	* Removes the key (and its corresponding value) from this map.
2027	<	* This method does nothing if the key is not in the map.
2026	>	* Legacy method testing if some key maps into the specified value
2027	>	* in this table.  This method is identical in functionality to
2028	>	* {@link #containsValue(Object)}, and exists solely to ensure
2029	>	* full compatibility with class {@link java.util.Hashtable},
2030	>	* which supported this method prior to introduction of the
2031	>	* Java Collections framework.
2032		*
2033	<	* @param  key the key that needs to be removed
2034	<	* @return the previous value associated with {@code key}, or
2035	<	*         {@code null} if there was no mapping for {@code key}
2036	<	* @throws NullPointerException if the specified key is null
2033	>	* @param  value a value to search for
2034	>	* @return {@code true} if and only if some key maps to the
2035	>	*         {@code value} argument in this table as
2036	>	*         determined by the {@code equals} method;
2037	>	*         {@code false} otherwise
2038	>	* @throws NullPointerException if the specified value is null
2039		*/
2040	<	@SuppressWarnings("unchecked") public V remove(Object key) {
2041	<	if (key == null)
2932	<	throw new NullPointerException();
2933	<	return (V)internalReplace(key, null, null);
2040	>	@Deprecated public boolean contains(Object value) {
2041	>	return containsValue(value);
2042		}
2043
2044		/**
2045	<	* {@inheritDoc}
2045	>	* Returns an enumeration of the keys in this table.
2046		*
2047	<	* @throws NullPointerException if the specified key is null
2047	>	* @return an enumeration of the keys in this table
2048	>	* @see #keySet()
2049		*/
2050	<	public boolean remove(Object key, Object value) {
2051	<	if (key == null)
2052	<	throw new NullPointerException();
2053	<	if (value == null)
2945	<	return false;
2946	<	return internalReplace(key, null, value) != null;
2050	>	public Enumeration<K> keys() {
2051	>	Node<K,V>[] t;
2052	>	int f = (t = table) == null ? 0 : t.length;
2053	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2054		}
2055
2056		/**
2057	<	* {@inheritDoc}
2057	>	* Returns an enumeration of the values in this table.
2058		*
2059	<	* @throws NullPointerException if any of the arguments are null
2059	>	* @return an enumeration of the values in this table
2060	>	* @see #values()
2061		*/
2062	<	public boolean replace(K key, V oldValue, V newValue) {
2063	<	if (key == null || oldValue == null || newValue == null)
2064	<	throw new NullPointerException();
2065	<	return internalReplace(key, newValue, oldValue) != null;
2062	>	public Enumeration<V> elements() {
2063	>	Node<K,V>[] t;
2064	>	int f = (t = table) == null ? 0 : t.length;
2065	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2066		}
2067
2068	+	// ConcurrentHashMapV8-only methods
2069	+
2070		/**
2071	<	* {@inheritDoc}
2071	>	* Returns the number of mappings. This method should be used
2072	>	* instead of {@link #size} because a ConcurrentHashMapV8 may
2073	>	* contain more mappings than can be represented as an int. The
2074	>	* value returned is an estimate; the actual count may differ if
2075	>	* there are concurrent insertions or removals.
2076		*
2077	<	* @return the previous value associated with the specified key,
2078	<	*         or {@code null} if there was no mapping for the key
2965	<	* @throws NullPointerException if the specified key or value is null
2077	>	* @return the number of mappings
2078	>	* @since 1.8
2079		*/
2080	<	@SuppressWarnings("unchecked") public V replace(K key, V value) {
2081	<	if (key == null || value == null)
2082	<	throw new NullPointerException();
2970	<	return (V)internalReplace(key, value, null);
2080	>	public long mappingCount() {
2081	>	long n = sumCount();
2082	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2083		}
2084
2085		/**
2086	<	* Removes all of the mappings from this map.
2086	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2087	>	* from the given type to {@code Boolean.TRUE}.
2088	>	*
2089	>	* @return the new set
2090	>	* @since 1.8
2091		*/
2092	<	public void clear() {
2093	<	internalClear();
2092	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2093	>	return new KeySetView<K,Boolean>
2094	>	(new ConcurrentHashMapV8<K,Boolean>(), Boolean.TRUE);
2095		}
2096
2097		/**
2098	<	* Returns a {@link Set} view of the keys contained in this map.
2099	<	* The set is backed by the map, so changes to the map are
2983	<	* reflected in the set, and vice-versa.
2098	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2099	>	* from the given type to {@code Boolean.TRUE}.
2100		*
2101	<	* @return the set view
2101	>	* @param initialCapacity The implementation performs internal
2102	>	* sizing to accommodate this many elements.
2103	>	* @throws IllegalArgumentException if the initial capacity of
2104	>	* elements is negative
2105	>	* @return the new set
2106	>	* @since 1.8
2107		*/
2108	<	public KeySetView<K,V> keySet() {
2109	<	KeySetView<K,V> ks = keySet;
2110	<	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2108	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2109	>	return new KeySetView<K,Boolean>
2110	>	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2111		}
2112
2113		/**
2114		* Returns a {@link Set} view of the keys in this map, using the
2115		* given common mapped value for any additions (i.e., {@link
2116	<	* Collection#add} and {@link Collection#addAll}). This is of
2117	<	* course only appropriate if it is acceptable to use the same
2118	<	* value for all additions from this view.
2116	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2117	>	* This is of course only appropriate if it is acceptable to use
2118	>	* the same value for all additions from this view.
2119		*
2120	<	* @param mappedValue the mapped value to use for any
3000	<	* additions.
2120	>	* @param mappedValue the mapped value to use for any additions
2121		* @return the set view
2122		* @throws NullPointerException if the mappedValue is null
2123		*/
#	Line 3007 | Line 2127 | public class ConcurrentHashMapV8<K, V>
2127		return new KeySetView<K,V>(this, mappedValue);
2128		}
2129
2130	+	/* ---------------- Special Nodes -------------- */
2131	+
2132		/**
2133	<	* Returns a {@link Collection} view of the values contained in this map.
3012	<	* The collection is backed by the map, so changes to the map are
3013	<	* reflected in the collection, and vice-versa.
2133	>	* A node inserted at head of bins during transfer operations.
2134		*/
2135	<	public ValuesView<K,V> values() {
2136	<	ValuesView<K,V> vs = values;
2137	<	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
2135	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2136	>	final Node<K,V>[] nextTable;
2137	>	ForwardingNode(Node<K,V>[] tab) {
2138	>	super(MOVED, null, null, null);
2139	>	this.nextTable = tab;
2140	>	}
2141	>
2142	>	Node<K,V> find(int h, Object k) {
2143	>	Node<K,V> e; int n;
2144	>	Node<K,V>[] tab = nextTable;
2145	>	if (k != null && tab != null && (n = tab.length) > 0 &&
2146	>	(e = tabAt(tab, (n - 1) & h)) != null) {
2147	>	do {
2148	>	int eh; K ek;
2149	>	if ((eh = e.hash) == h &&
2150	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2151	>	return e;
2152	>	if (eh < 0)
2153	>	return e.find(h, k);
2154	>	} while ((e = e.next) != null);
2155	>	}
2156	>	return null;
2157	>	}
2158		}
2159
2160		/**
2161	<	* Returns a {@link Set} view of the mappings contained in this map.
3022	<	* The set is backed by the map, so changes to the map are
3023	<	* reflected in the set, and vice-versa.  The set supports element
3024	<	* removal, which removes the corresponding mapping from the map,
3025	<	* via the {@code Iterator.remove}, {@code Set.remove},
3026	<	* {@code removeAll}, {@code retainAll}, and {@code clear}
3027	<	* operations.  It does not support the {@code add} or
3028	<	* {@code addAll} operations.
3029	<	*
3030	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
3031	<	* that will never throw {@link ConcurrentModificationException},
3032	<	* and guarantees to traverse elements as they existed upon
3033	<	* construction of the iterator, and may (but is not guaranteed to)
3034	<	* reflect any modifications subsequent to construction.
2161	>	* A place-holder node used in computeIfAbsent and compute
2162		*/
2163	<	public Set<Map.Entry<K,V>> entrySet() {
2164	<	EntrySetView<K,V> es = entrySet;
2165	<	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
2163	>	static final class ReservationNode<K,V> extends Node<K,V> {
2164	>	ReservationNode() {
2165	>	super(RESERVED, null, null, null);
2166	>	}
2167	>
2168	>	Node<K,V> find(int h, Object k) {
2169	>	return null;
2170	>	}
2171		}
2172
2173	+	/* ---------------- Table Initialization and Resizing -------------- */
2174	+
2175		/**
2176	<	* Returns an enumeration of the keys in this table.
3043	<	*
3044	<	* @return an enumeration of the keys in this table
3045	<	* @see #keySet()
2176	>	* Initializes table, using the size recorded in sizeCtl.
2177		*/
2178	<	public Enumeration<K> keys() {
2179	<	return new KeyIterator<K,V>(this);
2178	>	private final Node<K,V>[] initTable() {
2179	>	Node<K,V>[] tab; int sc;
2180	>	while ((tab = table) == null || tab.length == 0) {
2181	>	if ((sc = sizeCtl) < 0)
2182	>	Thread.yield(); // lost initialization race; just spin
2183	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2184	>	try {
2185	>	if ((tab = table) == null || tab.length == 0) {
2186	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2187	>	@SuppressWarnings({"rawtypes","unchecked"})
2188	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n];
2189	>	table = tab = nt;
2190	>	sc = n - (n >>> 2);
2191	>	}
2192	>	} finally {
2193	>	sizeCtl = sc;
2194	>	}
2195	>	break;
2196	>	}
2197	>	}
2198	>	return tab;
2199		}
2200
2201		/**
2202	<	* Returns an enumeration of the values in this table.
2203	<	*
2204	<	* @return an enumeration of the values in this table
2205	<	* @see #values()
2202	>	* Adds to count, and if table is too small and not already
2203	>	* resizing, initiates transfer. If already resizing, helps
2204	>	* perform transfer if work is available.  Rechecks occupancy
2205	>	* after a transfer to see if another resize is already needed
2206	>	* because resizings are lagging additions.
2207	>	*
2208	>	* @param x the count to add
2209	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
2210	>	*/
2211	>	private final void addCount(long x, int check) {
2212	>	CounterCell[] as; long b, s;
2213	>	if ((as = counterCells) != null ||
2214	>	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2215	>	CounterHashCode hc; CounterCell a; long v; int m;
2216	>	boolean uncontended = true;
2217	>	if ((hc = threadCounterHashCode.get()) == null ||
2218	>	as == null || (m = as.length - 1) < 0 ||
2219	>	(a = as[m & hc.code]) == null ||
2220	>	!(uncontended =
2221	>	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
2222	>	fullAddCount(x, hc, uncontended);
2223	>	return;
2224	>	}
2225	>	if (check <= 1)
2226	>	return;
2227	>	s = sumCount();
2228	>	}
2229	>	if (check >= 0) {
2230	>	Node<K,V>[] tab, nt; int sc;
2231	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2232	>	tab.length < MAXIMUM_CAPACITY) {
2233	>	if (sc < 0) {
2234	>	if (sc == -1 || transferIndex <= transferOrigin ||
2235	>	(nt = nextTable) == null)
2236	>	break;
2237	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2238	>	transfer(tab, nt);
2239	>	}
2240	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -2))
2241	>	transfer(tab, null);
2242	>	s = sumCount();
2243	>	}
2244	>	}
2245	>	}
2246	>
2247	>	/**
2248	>	* Helps transfer if a resize is in progress.
2249		*/
2250	<	public Enumeration<V> elements() {
2251	<	return new ValueIterator<K,V>(this);
2250	>	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2251	>	Node<K,V>[] nextTab; int sc;
2252	>	if ((f instanceof ForwardingNode) &&
2253	>	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2254	>	if (nextTab == nextTable && tab == table &&
2255	>	transferIndex > transferOrigin && (sc = sizeCtl) < -1 &&
2256	>	U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2257	>	transfer(tab, nextTab);
2258	>	return nextTab;
2259	>	}
2260	>	return table;
2261		}
2262
2263		/**
2264	<	* Returns a partitionable iterator of the keys in this map.
2264	>	* Tries to presize table to accommodate the given number of elements.
2265		*
2266	<	* @return a partitionable iterator of the keys in this map
2266	>	* @param size number of elements (doesn't need to be perfectly accurate)
2267		*/
2268	<	public Spliterator<K> keySpliterator() {
2269	<	return new KeyIterator<K,V>(this);
2268	>	private final void tryPresize(int size) {
2269	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2270	>	tableSizeFor(size + (size >>> 1) + 1);
2271	>	int sc;
2272	>	while ((sc = sizeCtl) >= 0) {
2273	>	Node<K,V>[] tab = table; int n;
2274	>	if (tab == null || (n = tab.length) == 0) {
2275	>	n = (sc > c) ? sc : c;
2276	>	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2277	>	try {
2278	>	if (table == tab) {
2279	>	@SuppressWarnings({"rawtypes","unchecked"})
2280	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n];
2281	>	table = nt;
2282	>	sc = n - (n >>> 2);
2283	>	}
2284	>	} finally {
2285	>	sizeCtl = sc;
2286	>	}
2287	>	}
2288	>	}
2289	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2290	>	break;
2291	>	else if (tab == table &&
2292	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2293	>	transfer(tab, null);
2294	>	}
2295		}
2296
2297		/**
2298	<	* Returns a partitionable iterator of the values in this map.
2299	<	*
3073	<	* @return a partitionable iterator of the values in this map
2298	>	* Moves and/or copies the nodes in each bin to new table. See
2299	>	* above for explanation.
2300		*/
2301	<	public Spliterator<V> valueSpliterator() {
2302	<	return new ValueIterator<K,V>(this);
2301	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2302	>	int n = tab.length, stride;
2303	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2304	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
2305	>	if (nextTab == null) {            // initiating
2306	>	try {
2307	>	@SuppressWarnings({"rawtypes","unchecked"})
2308	>	Node<K,V>[] nt = (Node<K,V>[])new Node[n << 1];
2309	>	nextTab = nt;
2310	>	} catch (Throwable ex) {      // try to cope with OOME
2311	>	sizeCtl = Integer.MAX_VALUE;
2312	>	return;
2313	>	}
2314	>	nextTable = nextTab;
2315	>	transferOrigin = n;
2316	>	transferIndex = n;
2317	>	ForwardingNode<K,V> rev = new ForwardingNode<K,V>(tab);
2318	>	for (int k = n; k > 0;) {    // progressively reveal ready slots
2319	>	int nextk = (k > stride) ? k - stride : 0;
2320	>	for (int m = nextk; m < k; ++m)
2321	>	nextTab[m] = rev;
2322	>	for (int m = n + nextk; m < n + k; ++m)
2323	>	nextTab[m] = rev;
2324	>	U.putOrderedInt(this, TRANSFERORIGIN, k = nextk);
2325	>	}
2326	>	}
2327	>	int nextn = nextTab.length;
2328	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2329	>	boolean advance = true;
2330	>	for (int i = 0, bound = 0;;) {
2331	>	int nextIndex, nextBound, fh; Node<K,V> f;
2332	>	while (advance) {
2333	>	if (--i >= bound)
2334	>	advance = false;
2335	>	else if ((nextIndex = transferIndex) <= transferOrigin) {
2336	>	i = -1;
2337	>	advance = false;
2338	>	}
2339	>	else if (U.compareAndSwapInt
2340	>	(this, TRANSFERINDEX, nextIndex,
2341	>	nextBound = (nextIndex > stride ?
2342	>	nextIndex - stride : 0))) {
2343	>	bound = nextBound;
2344	>	i = nextIndex - 1;
2345	>	advance = false;
2346	>	}
2347	>	}
2348	>	if (i < 0 || i >= n || i + n >= nextn) {
2349	>	for (int sc;;) {
2350	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, ++sc)) {
2351	>	if (sc == -1) {
2352	>	nextTable = null;
2353	>	table = nextTab;
2354	>	sizeCtl = (n << 1) - (n >>> 1);
2355	>	}
2356	>	return;
2357	>	}
2358	>	}
2359	>	}
2360	>	else if ((f = tabAt(tab, i)) == null) {
2361	>	if (casTabAt(tab, i, null, fwd)) {
2362	>	setTabAt(nextTab, i, null);
2363	>	setTabAt(nextTab, i + n, null);
2364	>	advance = true;
2365	>	}
2366	>	}
2367	>	else if ((fh = f.hash) == MOVED)
2368	>	advance = true; // already processed
2369	>	else {
2370	>	synchronized (f) {
2371	>	if (tabAt(tab, i) == f) {
2372	>	Node<K,V> ln, hn;
2373	>	if (fh >= 0) {
2374	>	int runBit = fh & n;
2375	>	Node<K,V> lastRun = f;
2376	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2377	>	int b = p.hash & n;
2378	>	if (b != runBit) {
2379	>	runBit = b;
2380	>	lastRun = p;
2381	>	}
2382	>	}
2383	>	if (runBit == 0) {
2384	>	ln = lastRun;
2385	>	hn = null;
2386	>	}
2387	>	else {
2388	>	hn = lastRun;
2389	>	ln = null;
2390	>	}
2391	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2392	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2393	>	if ((ph & n) == 0)
2394	>	ln = new Node<K,V>(ph, pk, pv, ln);
2395	>	else
2396	>	hn = new Node<K,V>(ph, pk, pv, hn);
2397	>	}
2398	>	}
2399	>	else if (f instanceof TreeBin) {
2400	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2401	>	TreeNode<K,V> lo = null, loTail = null;
2402	>	TreeNode<K,V> hi = null, hiTail = null;
2403	>	int lc = 0, hc = 0;
2404	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2405	>	int h = e.hash;
2406	>	TreeNode<K,V> p = new TreeNode<K,V>
2407	>	(h, e.key, e.val, null, null);
2408	>	if ((h & n) == 0) {
2409	>	if ((p.prev = loTail) == null)
2410	>	lo = p;
2411	>	else
2412	>	loTail.next = p;
2413	>	loTail = p;
2414	>	++lc;
2415	>	}
2416	>	else {
2417	>	if ((p.prev = hiTail) == null)
2418	>	hi = p;
2419	>	else
2420	>	hiTail.next = p;
2421	>	hiTail = p;
2422	>	++hc;
2423	>	}
2424	>	}
2425	>	ln = (lc <= UNTREEIFY_THRESHOLD ?  untreeify(lo) :
2426	>	(hc != 0) ? new TreeBin<K,V>(lo) : t);
2427	>	hn = (hc <= UNTREEIFY_THRESHOLD ? untreeify(hi) :
2428	>	(lc != 0) ? new TreeBin<K,V>(hi) : t);
2429	>	}
2430	>	else
2431	>	ln = hn = null;
2432	>	setTabAt(nextTab, i, ln);
2433	>	setTabAt(nextTab, i + n, hn);
2434	>	setTabAt(tab, i, fwd);
2435	>	advance = true;
2436	>	}
2437	>	}
2438	>	}
2439	>	}
2440		}
2441
2442	+	/* ---------------- Conversion from/to TreeBins -------------- */
2443	+
2444		/**
2445	<	* Returns a partitionable iterator of the entries in this map.
2446	<	*
3082	<	* @return a partitionable iterator of the entries in this map
2445	>	* Replaces all linked nodes in bin at given index unless table is
2446	>	* too small, in which case resizes instead.
2447		*/
2448	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2449	<	return new EntryIterator<K,V>(this);
2448	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2449	>	Node<K,V> b; int n, sc;
2450	>	if (tab != null) {
2451	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY) {
2452	>	if (tab == table && (sc = sizeCtl) >= 0 &&
2453	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2454	>	transfer(tab, null);
2455	>	}
2456	>	else if ((b = tabAt(tab, index)) != null) {
2457	>	synchronized (b) {
2458	>	if (tabAt(tab, index) == b) {
2459	>	TreeNode<K,V> hd = null, tl = null;
2460	>	for (Node<K,V> e = b; e != null; e = e.next) {
2461	>	TreeNode<K,V> p =
2462	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2463	>	null, null);
2464	>	if ((p.prev = tl) == null)
2465	>	hd = p;
2466	>	else
2467	>	tl.next = p;
2468	>	tl = p;
2469	>	}
2470	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2471	>	}
2472	>	}
2473	>	}
2474	>	}
2475		}
2476
2477		/**
2478	<	* Returns the hash code value for this {@link Map}, i.e.,
3090	<	* the sum of, for each key-value pair in the map,
3091	<	* {@code key.hashCode() ^ value.hashCode()}.
3092	<	*
3093	<	* @return the hash code value for this map
2478	>	* Returns a list on non-TreeNodes replacing those in given list
2479		*/
2480	<	public int hashCode() {
2481	<	int h = 0;
2482	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2483	<	Object v;
2484	<	while ((v = it.advance()) != null) {
2485	<	h += it.nextKey.hashCode() ^ v.hashCode();
2480	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2481	>	Node<K,V> hd = null, tl = null;
2482	>	for (Node<K,V> q = b; q != null; q = q.next) {
2483	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2484	>	if (tl == null)
2485	>	hd = p;
2486	>	else
2487	>	tl.next = p;
2488	>	tl = p;
2489		}
2490	<	return h;
2490	>	return hd;
2491		}
2492
2493	+	/* ---------------- TreeNodes -------------- */
2494	+
2495		/**
2496	<	* Returns a string representation of this map.  The string
3107	<	* representation consists of a list of key-value mappings (in no
3108	<	* particular order) enclosed in braces ("{@code {}}").  Adjacent
3109	<	* mappings are separated by the characters {@code ", "} (comma
3110	<	* and space).  Each key-value mapping is rendered as the key
3111	<	* followed by an equals sign ("{@code =}") followed by the
3112	<	* associated value.
3113	<	*
3114	<	* @return a string representation of this map
2496	>	* Nodes for use in TreeBins
2497		*/
2498	<	public String toString() {
2499	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2500	<	StringBuilder sb = new StringBuilder();
2501	<	sb.append('{');
2502	<	Object v;
2503	<	if ((v = it.advance()) != null) {
2504	<	for (;;) {
2505	<	Object k = it.nextKey;
2506	<	sb.append(k == this ? "(this Map)" : k);
2507	<	sb.append('=');
2508	<	sb.append(v == this ? "(this Map)" : v);
2509	<	if ((v = it.advance()) == null)
2498	>	static final class TreeNode<K,V> extends Node<K,V> {
2499	>	TreeNode<K,V> parent;  // red-black tree links
2500	>	TreeNode<K,V> left;
2501	>	TreeNode<K,V> right;
2502	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2503	>	boolean red;
2504	>
2505	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2506	>	TreeNode<K,V> parent) {
2507	>	super(hash, key, val, next);
2508	>	this.parent = parent;
2509	>	}
2510	>
2511	>	Node<K,V> find(int h, Object k) {
2512	>	return findTreeNode(h, k, null);
2513	>	}
2514	>
2515	>	/**
2516	>	* Returns the TreeNode (or null if not found) for the given key
2517	>	* starting at given root.
2518	>	*/
2519	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2520	>	if (k != null) {
2521	>	TreeNode<K,V> p = this;
2522	>	do  {
2523	>	int ph, dir; K pk; TreeNode<K,V> q;
2524	>	TreeNode<K,V> pl = p.left, pr = p.right;
2525	>	if ((ph = p.hash) > h)
2526	>	p = pl;
2527	>	else if (ph < h)
2528	>	p = pr;
2529	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2530	>	return p;
2531	>	else if (pl == null && pr == null)
2532	>	break;
2533	>	else if ((kc != null ||
2534	>	(kc = comparableClassFor(k)) != null) &&
2535	>	(dir = compareComparables(kc, k, pk)) != 0)
2536	>	p = (dir < 0) ? pl : pr;
2537	>	else if (pl == null)
2538	>	p = pr;
2539	>	else if (pr == null ||
2540	>	(q = pr.findTreeNode(h, k, kc)) == null)
2541	>	p = pl;
2542	>	else
2543	>	return q;
2544	>	} while (p != null);
2545	>	}
2546	>	return null;
2547	>	}
2548	>	}
2549	>
2550	>	/* ---------------- TreeBins -------------- */
2551	>
2552	>	/**
2553	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2554	>	* keys or values, but instead point to list of TreeNodes and
2555	>	* their root. They also maintain a parasitic read-write lock
2556	>	* forcing writers (who hold bin lock) to wait for readers (who do
2557	>	* not) to complete before tree restructuring operations.
2558	>	*/
2559	>	static final class TreeBin<K,V> extends Node<K,V> {
2560	>	TreeNode<K,V> root;
2561	>	volatile TreeNode<K,V> first;
2562	>	volatile Thread waiter;
2563	>	volatile int lockState;
2564	>	// values for lockState
2565	>	static final int WRITER = 1; // set while holding write lock
2566	>	static final int WAITER = 2; // set when waiting for write lock
2567	>	static final int READER = 4; // increment value for setting read lock
2568	>
2569	>	/**
2570	>	* Creates bin with initial set of nodes headed by b.
2571	>	*/
2572	>	TreeBin(TreeNode<K,V> b) {
2573	>	super(TREEBIN, null, null, null);
2574	>	this.first = b;
2575	>	TreeNode<K,V> r = null;
2576	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2577	>	next = (TreeNode<K,V>)x.next;
2578	>	x.left = x.right = null;
2579	>	if (r == null) {
2580	>	x.parent = null;
2581	>	x.red = false;
2582	>	r = x;
2583	>	}
2584	>	else {
2585	>	Object key = x.key;
2586	>	int hash = x.hash;
2587	>	Class<?> kc = null;
2588	>	for (TreeNode<K,V> p = r;;) {
2589	>	int dir, ph;
2590	>	if ((ph = p.hash) > hash)
2591	>	dir = -1;
2592	>	else if (ph < hash)
2593	>	dir = 1;
2594	>	else if ((kc != null ||
2595	>	(kc = comparableClassFor(key)) != null))
2596	>	dir = compareComparables(kc, key, p.key);
2597	>	else
2598	>	dir = 0;
2599	>	TreeNode<K,V> xp = p;
2600	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2601	>	x.parent = xp;
2602	>	if (dir <= 0)
2603	>	xp.left = x;
2604	>	else
2605	>	xp.right = x;
2606	>	r = balanceInsertion(r, x);
2607	>	break;
2608	>	}
2609	>	}
2610	>	}
2611	>	}
2612	>	this.root = r;
2613	>	}
2614	>
2615	>	/**
2616	>	* Acquires write lock for tree restructuring
2617	>	*/
2618	>	private final void lockRoot() {
2619	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2620	>	contendedLock(); // offload to separate method
2621	>	}
2622	>
2623	>	/**
2624	>	* Releases write lock for tree restructuring
2625	>	*/
2626	>	private final void unlockRoot() {
2627	>	lockState = 0;
2628	>	}
2629	>
2630	>	/**
2631	>	* Possibly blocks awaiting root lock
2632	>	*/
2633	>	private final void contendedLock() {
2634	>	boolean waiting = false;
2635	>	for (int s;;) {
2636	>	if (((s = lockState) & WRITER) == 0) {
2637	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2638	>	if (waiting)
2639	>	waiter = null;
2640	>	return;
2641	>	}
2642	>	}
2643	>	else if ((s | WAITER) == 0) {
2644	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2645	>	waiting = true;
2646	>	waiter = Thread.currentThread();
2647	>	}
2648	>	}
2649	>	else if (waiting)
2650	>	LockSupport.park(this);
2651	>	}
2652	>	}
2653	>
2654	>	/**
2655	>	* Returns matching node or null if none. Tries to search
2656	>	* using tree compareisons from root, but continues linear
2657	>	* search when lock not available.
2658	>	*/
2659	>	final Node<K,V> find(int h, Object k) {
2660	>	if (k != null) {
2661	>	for (Node<K,V> e = first; e != null; e = e.next) {
2662	>	int s; K ek;
2663	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2664	>	if (e.hash == h &&
2665	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2666	>	return e;
2667	>	}
2668	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2669	>	s + READER)) {
2670	>	TreeNode<K,V> r, p;
2671	>	try {
2672	>	p = ((r = root) == null ? null :
2673	>	r.findTreeNode(h, k, null));
2674	>	} finally {
2675	>	Thread w;
2676	>	int ls;
2677	>	do {} while (!U.compareAndSwapInt
2678	>	(this, LOCKSTATE,
2679	>	ls = lockState, ls - READER));
2680	>	if (ls == (READER|WAITER) && (w = waiter) != null)
2681	>	LockSupport.unpark(w);
2682	>	}
2683	>	return p;
2684	>	}
2685	>	}
2686	>	}
2687	>	return null;
2688	>	}
2689	>
2690	>	/**
2691	>	* Finds or adds a node.
2692	>	* @return null if added
2693	>	*/
2694	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2695	>	Class<?> kc = null;
2696	>	for (TreeNode<K,V> p = root;;) {
2697	>	int dir, ph; K pk; TreeNode<K,V> q, pr;
2698	>	if (p == null) {
2699	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2700		break;
2701	<	sb.append(',').append(' ');
2701	>	}
2702	>	else if ((ph = p.hash) > h)
2703	>	dir = -1;
2704	>	else if (ph < h)
2705	>	dir = 1;
2706	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2707	>	return p;
2708	>	else if ((kc == null &&
2709	>	(kc = comparableClassFor(k)) == null) ||
2710	>	(dir = compareComparables(kc, k, pk)) == 0) {
2711	>	if (p.left == null)
2712	>	dir = 1;
2713	>	else if ((pr = p.right) == null ||
2714	>	(q = pr.findTreeNode(h, k, kc)) == null)
2715	>	dir = -1;
2716	>	else
2717	>	return q;
2718	>	}
2719	>	TreeNode<K,V> xp = p;
2720	>	if ((p = (dir < 0) ? p.left : p.right) == null) {
2721	>	TreeNode<K,V> x, f = first;
2722	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2723	>	if (f != null)
2724	>	f.prev = x;
2725	>	if (dir < 0)
2726	>	xp.left = x;
2727	>	else
2728	>	xp.right = x;
2729	>	if (!xp.red)
2730	>	x.red = true;
2731	>	else {
2732	>	lockRoot();
2733	>	try {
2734	>	root = balanceInsertion(root, x);
2735	>	} finally {
2736	>	unlockRoot();
2737	>	}
2738	>	}
2739	>	break;
2740	>	}
2741	>	}
2742	>	assert checkInvariants(root);
2743	>	return null;
2744	>	}
2745	>
2746	>	/**
2747	>	* Removes the given node, that must be present before this
2748	>	* call.  This is messier than typical red-black deletion code
2749	>	* because we cannot swap the contents of an interior node
2750	>	* with a leaf successor that is pinned by "next" pointers
2751	>	* that are accessible independently of lock. So instead we
2752	>	* swap the tree linkages.
2753	>	*
2754	>	* @return true if now too small so should be untreeified.
2755	>	*/
2756	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2757	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2758	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2759	>	TreeNode<K,V> r, rl;
2760	>	if (pred == null)
2761	>	first = next;
2762	>	else
2763	>	pred.next = next;
2764	>	if (next != null)
2765	>	next.prev = pred;
2766	>	if (first == null) {
2767	>	root = null;
2768	>	return true;
2769	>	}
2770	>	if ((r = root) == null || r.right == null || // too small
2771	>	(rl = r.left) == null || rl.left == null)
2772	>	return true;
2773	>	lockRoot();
2774	>	try {
2775	>	TreeNode<K,V> replacement;
2776	>	TreeNode<K,V> pl = p.left;
2777	>	TreeNode<K,V> pr = p.right;
2778	>	if (pl != null && pr != null) {
2779	>	TreeNode<K,V> s = pr, sl;
2780	>	while ((sl = s.left) != null) // find successor
2781	>	s = sl;
2782	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2783	>	TreeNode<K,V> sr = s.right;
2784	>	TreeNode<K,V> pp = p.parent;
2785	>	if (s == pr) { // p was s's direct parent
2786	>	p.parent = s;
2787	>	s.right = p;
2788	>	}
2789	>	else {
2790	>	TreeNode<K,V> sp = s.parent;
2791	>	if ((p.parent = sp) != null) {
2792	>	if (s == sp.left)
2793	>	sp.left = p;
2794	>	else
2795	>	sp.right = p;
2796	>	}
2797	>	if ((s.right = pr) != null)
2798	>	pr.parent = s;
2799	>	}
2800	>	p.left = null;
2801	>	if ((p.right = sr) != null)
2802	>	sr.parent = p;
2803	>	if ((s.left = pl) != null)
2804	>	pl.parent = s;
2805	>	if ((s.parent = pp) == null)
2806	>	r = s;
2807	>	else if (p == pp.left)
2808	>	pp.left = s;
2809	>	else
2810	>	pp.right = s;
2811	>	if (sr != null)
2812	>	replacement = sr;
2813	>	else
2814	>	replacement = p;
2815	>	}
2816	>	else if (pl != null)
2817	>	replacement = pl;
2818	>	else if (pr != null)
2819	>	replacement = pr;
2820	>	else
2821	>	replacement = p;
2822	>	if (replacement != p) {
2823	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2824	>	if (pp == null)
2825	>	r = replacement;
2826	>	else if (p == pp.left)
2827	>	pp.left = replacement;
2828	>	else
2829	>	pp.right = replacement;
2830	>	p.left = p.right = p.parent = null;
2831	>	}
2832	>
2833	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2834	>
2835	>	if (p == replacement) {  // detach pointers
2836	>	TreeNode<K,V> pp;
2837	>	if ((pp = p.parent) != null) {
2838	>	if (p == pp.left)
2839	>	pp.left = null;
2840	>	else if (p == pp.right)
2841	>	pp.right = null;
2842	>	p.parent = null;
2843	>	}
2844	>	}
2845	>	} finally {
2846	>	unlockRoot();
2847	>	}
2848	>	assert checkInvariants(root);
2849	>	return false;
2850	>	}
2851	>
2852	>	/* ------------------------------------------------------------ */
2853	>	// Red-black tree methods, all adapted from CLR
2854	>
2855	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2856	>	TreeNode<K,V> p) {
2857	>	TreeNode<K,V> r, pp, rl;
2858	>	if (p != null && (r = p.right) != null) {
2859	>	if ((rl = p.right = r.left) != null)
2860	>	rl.parent = p;
2861	>	if ((pp = r.parent = p.parent) == null)
2862	>	(root = r).red = false;
2863	>	else if (pp.left == p)
2864	>	pp.left = r;
2865	>	else
2866	>	pp.right = r;
2867	>	r.left = p;
2868	>	p.parent = r;
2869	>	}
2870	>	return root;
2871	>	}
2872	>
2873	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2874	>	TreeNode<K,V> p) {
2875	>	TreeNode<K,V> l, pp, lr;
2876	>	if (p != null && (l = p.left) != null) {
2877	>	if ((lr = p.left = l.right) != null)
2878	>	lr.parent = p;
2879	>	if ((pp = l.parent = p.parent) == null)
2880	>	(root = l).red = false;
2881	>	else if (pp.right == p)
2882	>	pp.right = l;
2883	>	else
2884	>	pp.left = l;
2885	>	l.right = p;
2886	>	p.parent = l;
2887	>	}
2888	>	return root;
2889	>	}
2890	>
2891	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2892	>	TreeNode<K,V> x) {
2893	>	x.red = true;
2894	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2895	>	if ((xp = x.parent) == null) {
2896	>	x.red = false;
2897	>	return x;
2898	>	}
2899	>	else if (!xp.red || (xpp = xp.parent) == null)
2900	>	return root;
2901	>	if (xp == (xppl = xpp.left)) {
2902	>	if ((xppr = xpp.right) != null && xppr.red) {
2903	>	xppr.red = false;
2904	>	xp.red = false;
2905	>	xpp.red = true;
2906	>	x = xpp;
2907	>	}
2908	>	else {
2909	>	if (x == xp.right) {
2910	>	root = rotateLeft(root, x = xp);
2911	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2912	>	}
2913	>	if (xp != null) {
2914	>	xp.red = false;
2915	>	if (xpp != null) {
2916	>	xpp.red = true;
2917	>	root = rotateRight(root, xpp);
2918	>	}
2919	>	}
2920	>	}
2921	>	}
2922	>	else {
2923	>	if (xppl != null && xppl.red) {
2924	>	xppl.red = false;
2925	>	xp.red = false;
2926	>	xpp.red = true;
2927	>	x = xpp;
2928	>	}
2929	>	else {
2930	>	if (x == xp.left) {
2931	>	root = rotateRight(root, x = xp);
2932	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2933	>	}
2934	>	if (xp != null) {
2935	>	xp.red = false;
2936	>	if (xpp != null) {
2937	>	xpp.red = true;
2938	>	root = rotateLeft(root, xpp);
2939	>	}
2940	>	}
2941	>	}
2942	>	}
2943	>	}
2944	>	}
2945	>
2946	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
2947	>	TreeNode<K,V> x) {
2948	>	for (TreeNode<K,V> xp, xpl, xpr;;)  {
2949	>	if (x == null || x == root)
2950	>	return root;
2951	>	else if ((xp = x.parent) == null) {
2952	>	x.red = false;
2953	>	return x;
2954	>	}
2955	>	else if (x.red) {
2956	>	x.red = false;
2957	>	return root;
2958	>	}
2959	>	else if ((xpl = xp.left) == x) {
2960	>	if ((xpr = xp.right) != null && xpr.red) {
2961	>	xpr.red = false;
2962	>	xp.red = true;
2963	>	root = rotateLeft(root, xp);
2964	>	xpr = (xp = x.parent) == null ? null : xp.right;
2965	>	}
2966	>	if (xpr == null)
2967	>	x = xp;
2968	>	else {
2969	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
2970	>	if ((sr == null || !sr.red) &&
2971	>	(sl == null || !sl.red)) {
2972	>	xpr.red = true;
2973	>	x = xp;
2974	>	}
2975	>	else {
2976	>	if (sr == null || !sr.red) {
2977	>	if (sl != null)
2978	>	sl.red = false;
2979	>	xpr.red = true;
2980	>	root = rotateRight(root, xpr);
2981	>	xpr = (xp = x.parent) == null ?
2982	>	null : xp.right;
2983	>	}
2984	>	if (xpr != null) {
2985	>	xpr.red = (xp == null) ? false : xp.red;
2986	>	if ((sr = xpr.right) != null)
2987	>	sr.red = false;
2988	>	}
2989	>	if (xp != null) {
2990	>	xp.red = false;
2991	>	root = rotateLeft(root, xp);
2992	>	}
2993	>	x = root;
2994	>	}
2995	>	}
2996	>	}
2997	>	else { // symmetric
2998	>	if (xpl != null && xpl.red) {
2999	>	xpl.red = false;
3000	>	xp.red = true;
3001	>	root = rotateRight(root, xp);
3002	>	xpl = (xp = x.parent) == null ? null : xp.left;
3003	>	}
3004	>	if (xpl == null)
3005	>	x = xp;
3006	>	else {
3007	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3008	>	if ((sl == null || !sl.red) &&
3009	>	(sr == null || !sr.red)) {
3010	>	xpl.red = true;
3011	>	x = xp;
3012	>	}
3013	>	else {
3014	>	if (sl == null || !sl.red) {
3015	>	if (sr != null)
3016	>	sr.red = false;
3017	>	xpl.red = true;
3018	>	root = rotateLeft(root, xpl);
3019	>	xpl = (xp = x.parent) == null ?
3020	>	null : xp.left;
3021	>	}
3022	>	if (xpl != null) {
3023	>	xpl.red = (xp == null) ? false : xp.red;
3024	>	if ((sl = xpl.left) != null)
3025	>	sl.red = false;
3026	>	}
3027	>	if (xp != null) {
3028	>	xp.red = false;
3029	>	root = rotateRight(root, xp);
3030	>	}
3031	>	x = root;
3032	>	}
3033	>	}
3034	>	}
3035	>	}
3036	>	}
3037	>	/**
3038	>	* Recursive invariant check
3039	>	*/
3040	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3041	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3042	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3043	>	if (tb != null && tb.next != t)
3044	>	return false;
3045	>	if (tn != null && tn.prev != t)
3046	>	return false;
3047	>	if (tp != null && t != tp.left && t != tp.right)
3048	>	return false;
3049	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3050	>	return false;
3051	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3052	>	return false;
3053	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3054	>	return false;
3055	>	if (tl != null && !checkInvariants(tl))
3056	>	return false;
3057	>	if (tr != null && !checkInvariants(tr))
3058	>	return false;
3059	>	return true;
3060	>	}
3061	>
3062	>	private static final sun.misc.Unsafe U;
3063	>	private static final long LOCKSTATE;
3064	>	static {
3065	>	try {
3066	>	U = getUnsafe();
3067	>	Class<?> k = TreeBin.class;
3068	>	LOCKSTATE = U.objectFieldOffset
3069	>	(k.getDeclaredField("lockState"));
3070	>	} catch (Exception e) {
3071	>	throw new Error(e);
3072		}
3073		}
3132	–	return sb.append('}').toString();
3074		}
3075
3076	+	/* ----------------Table Traversal -------------- */
3077	+
3078		/**
3079	<	* Compares the specified object with this map for equality.
3080	<	* Returns {@code true} if the given object is a map with the same
3138	<	* mappings as this map.  This operation may return misleading
3139	<	* results if either map is concurrently modified during execution
3140	<	* of this method.
3079	>	* Encapsulates traversal for methods such as containsValue; also
3080	>	* serves as a base class for other iterators and spliterators.
3081		*
3082	<	* @param o object to be compared for equality with this map
3083	<	* @return {@code true} if the specified object is equal to this map
3082	>	* Method advance visits once each still-valid node that was
3083	>	* reachable upon iterator construction. It might miss some that
3084	>	* were added to a bin after the bin was visited, which is OK wrt
3085	>	* consistency guarantees. Maintaining this property in the face
3086	>	* of possible ongoing resizes requires a fair amount of
3087	>	* bookkeeping state that is difficult to optimize away amidst
3088	>	* volatile accesses.  Even so, traversal maintains reasonable
3089	>	* throughput.
3090	>	*
3091	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3092	>	* However, if the table has been resized, then all future steps
3093	>	* must traverse both the bin at the current index as well as at
3094	>	* (index + baseSize); and so on for further resizings. To
3095	>	* paranoically cope with potential sharing by users of iterators
3096	>	* across threads, iteration terminates if a bounds checks fails
3097	>	* for a table read.
3098		*/
3099	<	public boolean equals(Object o) {
3100	<	if (o != this) {
3101	<	if (!(o instanceof Map))
3102	<	return false;
3103	<	Map<?,?> m = (Map<?,?>) o;
3104	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3105	<	Object val;
3106	<	while ((val = it.advance()) != null) {
3107	<	Object v = m.get(it.nextKey);
3108	<	if (v == null || (v != val && !v.equals(val)))
3109	<	return false;
3110	<	}
3111	<	for (Map.Entry<?,?> e : m.entrySet()) {
3112	<	Object mk, mv, v;
3113	<	if ((mk = e.getKey()) == null ||
3114	<	(mv = e.getValue()) == null ||
3115	<	(v = internalGet(mk)) == null ||
3116	<	(mv != v && !mv.equals(v)))
3117	<	return false;
3099	>	static class Traverser<K,V> {
3100	>	Node<K,V>[] tab;        // current table; updated if resized
3101	>	Node<K,V> next;         // the next entry to use
3102	>	int index;              // index of bin to use next
3103	>	int baseIndex;          // current index of initial table
3104	>	int baseLimit;          // index bound for initial table
3105	>	final int baseSize;     // initial table size
3106	>
3107	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3108	>	this.tab = tab;
3109	>	this.baseSize = size;
3110	>	this.baseIndex = this.index = index;
3111	>	this.baseLimit = limit;
3112	>	this.next = null;
3113	>	}
3114	>
3115	>	/**
3116	>	* Advances if possible, returning next valid node, or null if none.
3117	>	*/
3118	>	final Node<K,V> advance() {
3119	>	Node<K,V> e;
3120	>	if ((e = next) != null)
3121	>	e = e.next;
3122	>	for (;;) {
3123	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
3124	>	if (e != null)
3125	>	return next = e;
3126	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3127	>	(n = t.length) <= (i = index) || i < 0)
3128	>	return next = null;
3129	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
3130	>	if (e instanceof ForwardingNode) {
3131	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3132	>	e = null;
3133	>	continue;
3134	>	}
3135	>	else if (e instanceof TreeBin)
3136	>	e = ((TreeBin<K,V>)e).first;
3137	>	else
3138	>	e = null;
3139	>	}
3140	>	if ((index += baseSize) >= n)
3141	>	index = ++baseIndex;    // visit upper slots if present
3142		}
3143		}
3166	–	return true;
3144		}
3145
3146	<	/* ----------------Iterators -------------- */
3147	<
3148	<	@SuppressWarnings("serial") static final class KeyIterator<K,V> extends Traverser<K,V,Object>
3149	<	implements Spliterator<K>, Enumeration<K> {
3150	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3151	<	KeyIterator(Traverser<K,V,Object> it) {
3152	<	super(it);
3146	>	/**
3147	>	* Base of key, value, and entry Iterators. Adds fields to
3148	>	* Traverser to support iterator.remove
3149	>	*/
3150	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3151	>	final ConcurrentHashMapV8<K,V> map;
3152	>	Node<K,V> lastReturned;
3153	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3154	>	ConcurrentHashMapV8<K,V> map) {
3155	>	super(tab, size, index, limit);
3156	>	this.map = map;
3157	>	advance();
3158		}
3159	<	public KeyIterator<K,V> split() {
3160	<	if (nextKey != null)
3159	>
3160	>	public final boolean hasNext() { return next != null; }
3161	>	public final boolean hasMoreElements() { return next != null; }
3162	>
3163	>	public final void remove() {
3164	>	Node<K,V> p;
3165	>	if ((p = lastReturned) == null)
3166		throw new IllegalStateException();
3167	<	return new KeyIterator<K,V>(this);
3167	>	lastReturned = null;
3168	>	map.replaceNode(p.key, null, null);
3169	>	}
3170	>	}
3171	>
3172	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3173	>	implements Iterator<K>, Enumeration<K> {
3174	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3175	>	ConcurrentHashMapV8<K,V> map) {
3176	>	super(tab, index, size, limit, map);
3177		}
3178	<	@SuppressWarnings("unchecked") public final K next() {
3179	<	if (nextVal == null && advance() == null)
3178	>
3179	>	public final K next() {
3180	>	Node<K,V> p;
3181	>	if ((p = next) == null)
3182		throw new NoSuchElementException();
3183	<	Object k = nextKey;
3184	<	nextVal = null;
3185	<	return (K) k;
3183	>	K k = p.key;
3184	>	lastReturned = p;
3185	>	advance();
3186	>	return k;
3187		}
3188
3189		public final K nextElement() { return next(); }
3190		}
3191
3192	<	@SuppressWarnings("serial") static final class ValueIterator<K,V> extends Traverser<K,V,Object>
3193	<	implements Spliterator<V>, Enumeration<V> {
3194	<	ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3195	<	ValueIterator(Traverser<K,V,Object> it) {
3196	<	super(it);
3198	<	}
3199	<	public ValueIterator<K,V> split() {
3200	<	if (nextKey != null)
3201	<	throw new IllegalStateException();
3202	<	return new ValueIterator<K,V>(this);
3192	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3193	>	implements Iterator<V>, Enumeration<V> {
3194	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3195	>	ConcurrentHashMapV8<K,V> map) {
3196	>	super(tab, index, size, limit, map);
3197		}
3198
3199	<	@SuppressWarnings("unchecked") public final V next() {
3200	<	Object v;
3201	<	if ((v = nextVal) == null && (v = advance()) == null)
3199	>	public final V next() {
3200	>	Node<K,V> p;
3201	>	if ((p = next) == null)
3202		throw new NoSuchElementException();
3203	<	nextVal = null;
3204	<	return (V) v;
3203	>	V v = p.val;
3204	>	lastReturned = p;
3205	>	advance();
3206	>	return v;
3207		}
3208
3209		public final V nextElement() { return next(); }
3210		}
3211
3212	<	@SuppressWarnings("serial") static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3213	<	implements Spliterator<Map.Entry<K,V>> {
3214	<	EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3215	<	EntryIterator(Traverser<K,V,Object> it) {
3216	<	super(it);
3221	<	}
3222	<	public EntryIterator<K,V> split() {
3223	<	if (nextKey != null)
3224	<	throw new IllegalStateException();
3225	<	return new EntryIterator<K,V>(this);
3212	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3213	>	implements Iterator<Map.Entry<K,V>> {
3214	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3215	>	ConcurrentHashMapV8<K,V> map) {
3216	>	super(tab, index, size, limit, map);
3217		}
3218
3219	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3220	<	Object v;
3221	<	if ((v = nextVal) == null && (v = advance()) == null)
3219	>	public final Map.Entry<K,V> next() {
3220	>	Node<K,V> p;
3221	>	if ((p = next) == null)
3222		throw new NoSuchElementException();
3223	<	Object k = nextKey;
3224	<	nextVal = null;
3225	<	return new MapEntry<K,V>((K)k, (V)v, map);
3223	>	K k = p.key;
3224	>	V v = p.val;
3225	>	lastReturned = p;
3226	>	advance();
3227	>	return new MapEntry<K,V>(k, v, map);
3228		}
3229		}
3230
3231		/**
3232	<	* Exported Entry for iterators
3232	>	* Exported Entry for EntryIterator
3233		*/
3234	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3234	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3235		final K key; // non-null
3236		V val;       // non-null
3237	<	final ConcurrentHashMapV8<K, V> map;
3238	<	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3237	>	final ConcurrentHashMapV8<K,V> map;
3238	>	MapEntry(K key, V val, ConcurrentHashMapV8<K,V> map) {
3239		this.key = key;
3240		this.val = val;
3241		this.map = map;
3242		}
3243	<	public final K getKey()       { return key; }
3244	<	public final V getValue()     { return val; }
3245	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3246	<	public final String toString(){ return key + "=" + val; }
3243	>	public K getKey()        { return key; }
3244	>	public V getValue()      { return val; }
3245	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3246	>	public String toString() { return key + "=" + val; }
3247
3248	<	public final boolean equals(Object o) {
3248	>	public boolean equals(Object o) {
3249		Object k, v; Map.Entry<?,?> e;
3250		return ((o instanceof Map.Entry) &&
3251		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3266 | Line 3259 | public class ConcurrentHashMapV8<K, V>
3259		* value to return is somewhat arbitrary here. Since we do not
3260		* necessarily track asynchronous changes, the most recent
3261		* "previous" value could be different from what we return (or
3262	<	* could even have been removed in which case the put will
3262	>	* could even have been removed, in which case the put will
3263		* re-establish). We do not and cannot guarantee more.
3264		*/
3265	<	public final V setValue(V value) {
3265	>	public V setValue(V value) {
3266		if (value == null) throw new NullPointerException();
3267		V v = val;
3268		val = value;
#	Line 3278 | Line 3271 | public class ConcurrentHashMapV8<K, V>
3271		}
3272		}
3273
3274	<	/* ---------------- Serialization Support -------------- */
3274	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3275	>	implements ConcurrentHashMapSpliterator<K> {
3276	>	long est;               // size estimate
3277	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3278	>	long est) {
3279	>	super(tab, size, index, limit);
3280	>	this.est = est;
3281	>	}
3282	>
3283	>	public ConcurrentHashMapSpliterator<K> trySplit() {
3284	>	int i, f, h;
3285	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3286	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3287	>	f, est >>>= 1);
3288	>	}
3289
3290	<	/**
3291	<	* Stripped-down version of helper class used in previous version,
3292	<	* declared for the sake of serialization compatibility
3293	<	*/
3294	<	static class Segment<K,V> implements Serializable {
3288	<	private static final long serialVersionUID = 2249069246763182397L;
3289	<	final float loadFactor;
3290	<	Segment(float lf) { this.loadFactor = lf; }
3291	<	}
3290	>	public void forEachRemaining(Action<? super K> action) {
3291	>	if (action == null) throw new NullPointerException();
3292	>	for (Node<K,V> p; (p = advance()) != null;)
3293	>	action.apply(p.key);
3294	>	}
3295
3296	<	/**
3297	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
3298	<	* stream (i.e., serializes it).
3299	<	* @param s the stream
3300	<	* @serialData
3301	<	* the key (Object) and value (Object)
3302	<	* for each key-value mapping, followed by a null pair.
3300	<	* The key-value mappings are emitted in no particular order.
3301	<	*/
3302	<	@SuppressWarnings("unchecked") private void writeObject(java.io.ObjectOutputStream s)
3303	<	throws java.io.IOException {
3304	<	if (segments == null) { // for serialization compatibility
3305	<	segments = (Segment<K,V>[])
3306	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
3307	<	for (int i = 0; i < segments.length; ++i)
3308	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
3309	<	}
3310	<	s.defaultWriteObject();
3311	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3312	<	Object v;
3313	<	while ((v = it.advance()) != null) {
3314	<	s.writeObject(it.nextKey);
3315	<	s.writeObject(v);
3296	>	public boolean tryAdvance(Action<? super K> action) {
3297	>	if (action == null) throw new NullPointerException();
3298	>	Node<K,V> p;
3299	>	if ((p = advance()) == null)
3300	>	return false;
3301	>	action.apply(p.key);
3302	>	return true;
3303		}
3304	<	s.writeObject(null);
3305	<	s.writeObject(null);
3306	<	segments = null; // throw away
3304	>
3305	>	public long estimateSize() { return est; }
3306	>
3307		}
3308
3309	<	/**
3310	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3311	<	* @param s the stream
3312	<	*/
3313	<	@SuppressWarnings("unchecked") private void readObject(java.io.ObjectInputStream s)
3314	<	throws java.io.IOException, ClassNotFoundException {
3315	<	s.defaultReadObject();
3316	<	this.segments = null; // unneeded
3330	<	// initialize transient final field
3331	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
3309	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3310	>	implements ConcurrentHashMapSpliterator<V> {
3311	>	long est;               // size estimate
3312	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3313	>	long est) {
3314	>	super(tab, size, index, limit);
3315	>	this.est = est;
3316	>	}
3317
3318	<	// Create all nodes, then place in table once size is known
3319	<	long size = 0L;
3320	<	Node p = null;
3321	<	for (;;) {
3322	<	K k = (K) s.readObject();
3338	<	V v = (V) s.readObject();
3339	<	if (k != null && v != null) {
3340	<	int h = spread(k.hashCode());
3341	<	p = new Node(h, k, v, p);
3342	<	++size;
3343	<	}
3344	<	else
3345	<	break;
3318	>	public ConcurrentHashMapSpliterator<V> trySplit() {
3319	>	int i, f, h;
3320	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3321	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3322	>	f, est >>>= 1);
3323		}
3324	<	if (p != null) {
3325	<	boolean init = false;
3326	<	int n;
3327	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3328	<	n = MAXIMUM_CAPACITY;
3352	<	else {
3353	<	int sz = (int)size;
3354	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
3355	<	}
3356	<	int sc = sizeCtl;
3357	<	boolean collide = false;
3358	<	if (n > sc &&
3359	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
3360	<	try {
3361	<	if (table == null) {
3362	<	init = true;
3363	<	Node[] tab = new Node[n];
3364	<	int mask = n - 1;
3365	<	while (p != null) {
3366	<	int j = p.hash & mask;
3367	<	Node next = p.next;
3368	<	Node q = p.next = tabAt(tab, j);
3369	<	setTabAt(tab, j, p);
3370	<	if (!collide && q != null && q.hash == p.hash)
3371	<	collide = true;
3372	<	p = next;
3373	<	}
3374	<	table = tab;
3375	<	counter.add(size);
3376	<	sc = n - (n >>> 2);
3377	<	}
3378	<	} finally {
3379	<	sizeCtl = sc;
3380	<	}
3381	<	if (collide) { // rescan and convert to TreeBins
3382	<	Node[] tab = table;
3383	<	for (int i = 0; i < tab.length; ++i) {
3384	<	int c = 0;
3385	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
3386	<	if (++c > TREE_THRESHOLD &&
3387	<	(e.key instanceof Comparable)) {
3388	<	replaceWithTreeBin(tab, i, e.key);
3389	<	break;
3390	<	}
3391	<	}
3392	<	}
3393	<	}
3394	<	}
3395	<	if (!init) { // Can only happen if unsafely published.
3396	<	while (p != null) {
3397	<	internalPut(p.key, p.val);
3398	<	p = p.next;
3399	<	}
3400	<	}
3324	>
3325	>	public void forEachRemaining(Action<? super V> action) {
3326	>	if (action == null) throw new NullPointerException();
3327	>	for (Node<K,V> p; (p = advance()) != null;)
3328	>	action.apply(p.val);
3329		}
3330	+
3331	+	public boolean tryAdvance(Action<? super V> action) {
3332	+	if (action == null) throw new NullPointerException();
3333	+	Node<K,V> p;
3334	+	if ((p = advance()) == null)
3335	+	return false;
3336	+	action.apply(p.val);
3337	+	return true;
3338	+	}
3339	+
3340	+	public long estimateSize() { return est; }
3341	+
3342		}
3343
3344	+	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3345	+	implements ConcurrentHashMapSpliterator<Map.Entry<K,V>> {
3346	+	final ConcurrentHashMapV8<K,V> map; // To export MapEntry
3347	+	long est;               // size estimate
3348	+	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3349	+	long est, ConcurrentHashMapV8<K,V> map) {
3350	+	super(tab, size, index, limit);
3351	+	this.map = map;
3352	+	this.est = est;
3353	+	}
3354
3355	<	// -------------------------------------------------------
3355	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> trySplit() {
3356	>	int i, f, h;
3357	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3358	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3359	>	f, est >>>= 1, map);
3360	>	}
3361
3362	<	// Sams
3363	<	/** Interface describing a void action of one argument */
3364	<	public interface Action<A> { void apply(A a); }
3365	<	/** Interface describing a void action of two arguments */
3366	<	public interface BiAction<A,B> { void apply(A a, B b); }
3367	<	/** Interface describing a function of one argument */
3368	<	public interface Fun<A,T> { T apply(A a); }
3369	<	/** Interface describing a function of two arguments */
3370	<	public interface BiFun<A,B,T> { T apply(A a, B b); }
3371	<	/** Interface describing a function of no arguments */
3372	<	public interface Generator<T> { T apply(); }
3373	<	/** Interface describing a function mapping its argument to a double */
3374	<	public interface ObjectToDouble<A> { double apply(A a); }
3375	<	/** Interface describing a function mapping its argument to a long */
3421	<	public interface ObjectToLong<A> { long apply(A a); }
3422	<	/** Interface describing a function mapping its argument to an int */
3423	<	public interface ObjectToInt<A> {int apply(A a); }
3424	<	/** Interface describing a function mapping two arguments to a double */
3425	<	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
3426	<	/** Interface describing a function mapping two arguments to a long */
3427	<	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
3428	<	/** Interface describing a function mapping two arguments to an int */
3429	<	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
3430	<	/** Interface describing a function mapping a double to a double */
3431	<	public interface DoubleToDouble { double apply(double a); }
3432	<	/** Interface describing a function mapping a long to a long */
3433	<	public interface LongToLong { long apply(long a); }
3434	<	/** Interface describing a function mapping an int to an int */
3435	<	public interface IntToInt { int apply(int a); }
3436	<	/** Interface describing a function mapping two doubles to a double */
3437	<	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3438	<	/** Interface describing a function mapping two longs to a long */
3439	<	public interface LongByLongToLong { long apply(long a, long b); }
3440	<	/** Interface describing a function mapping two ints to an int */
3441	<	public interface IntByIntToInt { int apply(int a, int b); }
3362	>	public void forEachRemaining(Action<? super Map.Entry<K,V>> action) {
3363	>	if (action == null) throw new NullPointerException();
3364	>	for (Node<K,V> p; (p = advance()) != null; )
3365	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3366	>	}
3367	>
3368	>	public boolean tryAdvance(Action<? super Map.Entry<K,V>> action) {
3369	>	if (action == null) throw new NullPointerException();
3370	>	Node<K,V> p;
3371	>	if ((p = advance()) == null)
3372	>	return false;
3373	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3374	>	return true;
3375	>	}
3376
3377	+	public long estimateSize() { return est; }
3378
3379	<	// -------------------------------------------------------
3379	>	}
3380	>
3381	>	// Parallel bulk operations
3382	>
3383	>	/**
3384	>	* Computes initial batch value for bulk tasks. The returned value
3385	>	* is approximately exp2 of the number of times (minus one) to
3386	>	* split task by two before executing leaf action. This value is
3387	>	* faster to compute and more convenient to use as a guide to
3388	>	* splitting than is the depth, since it is used while dividing by
3389	>	* two anyway.
3390	>	*/
3391	>	final int batchFor(long b) {
3392	>	long n;
3393	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3394	>	return 0;
3395	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3396	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3397	>	}
3398
3399		/**
3400		* Performs the given action for each (key, value).
3401		*
3402	+	* @param parallelismThreshold the (estimated) number of elements
3403	+	* needed for this operation to be executed in parallel
3404		* @param action the action
3405	+	* @since 1.8
3406		*/
3407	<	public void forEach(BiAction<K,V> action) {
3408	<	ForkJoinTasks.forEach
3409	<	(this, action).invoke();
3407	>	public void forEach(long parallelismThreshold,
3408	>	BiAction<? super K,? super V> action) {
3409	>	if (action == null) throw new NullPointerException();
3410	>	new ForEachMappingTask<K,V>
3411	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3412	>	action).invoke();
3413		}
3414
3415		/**
3416		* Performs the given action for each non-null transformation
3417		* of each (key, value).
3418		*
3419	+	* @param parallelismThreshold the (estimated) number of elements
3420	+	* needed for this operation to be executed in parallel
3421		* @param transformer a function returning the transformation
3422	<	* for an element, or null of there is no transformation (in
3423	<	* which case the action is not applied).
3422	>	* for an element, or null if there is no transformation (in
3423	>	* which case the action is not applied)
3424		* @param action the action
3425	+	* @since 1.8
3426		*/
3427	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3428	<	Action<U> action) {
3429	<	ForkJoinTasks.forEach
3430	<	(this, transformer, action).invoke();
3427	>	public <U> void forEach(long parallelismThreshold,
3428	>	BiFun<? super K, ? super V, ? extends U> transformer,
3429	>	Action<? super U> action) {
3430	>	if (transformer == null || action == null)
3431	>	throw new NullPointerException();
3432	>	new ForEachTransformedMappingTask<K,V,U>
3433	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3434	>	transformer, action).invoke();
3435		}
3436
3437		/**
#	Line 3475 | Line 3441 | public class ConcurrentHashMapV8<K, V>
3441		* results of any other parallel invocations of the search
3442		* function are ignored.
3443		*
3444	+	* @param parallelismThreshold the (estimated) number of elements
3445	+	* needed for this operation to be executed in parallel
3446		* @param searchFunction a function returning a non-null
3447		* result on success, else null
3448		* @return a non-null result from applying the given search
3449		* function on each (key, value), or null if none
3450	+	* @since 1.8
3451		*/
3452	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3453	<	return ForkJoinTasks.search
3454	<	(this, searchFunction).invoke();
3452	>	public <U> U search(long parallelismThreshold,
3453	>	BiFun<? super K, ? super V, ? extends U> searchFunction) {
3454	>	if (searchFunction == null) throw new NullPointerException();
3455	>	return new SearchMappingsTask<K,V,U>
3456	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3457	>	searchFunction, new AtomicReference<U>()).invoke();
3458		}
3459
3460		/**
#	Line 3490 | Line 3462 | public class ConcurrentHashMapV8<K, V>
3462		* of all (key, value) pairs using the given reducer to
3463		* combine values, or null if none.
3464		*
3465	+	* @param parallelismThreshold the (estimated) number of elements
3466	+	* needed for this operation to be executed in parallel
3467		* @param transformer a function returning the transformation
3468	<	* for an element, or null of there is no transformation (in
3469	<	* which case it is not combined).
3468	>	* for an element, or null if there is no transformation (in
3469	>	* which case it is not combined)
3470		* @param reducer a commutative associative combining function
3471		* @return the result of accumulating the given transformation
3472		* of all (key, value) pairs
3473	+	* @since 1.8
3474		*/
3475	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3475	>	public <U> U reduce(long parallelismThreshold,
3476	>	BiFun<? super K, ? super V, ? extends U> transformer,
3477		BiFun<? super U, ? super U, ? extends U> reducer) {
3478	<	return ForkJoinTasks.reduce
3479	<	(this, transformer, reducer).invoke();
3478	>	if (transformer == null || reducer == null)
3479	>	throw new NullPointerException();
3480	>	return new MapReduceMappingsTask<K,V,U>
3481	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3482	>	null, transformer, reducer).invoke();
3483		}
3484
3485		/**
#	Line 3508 | Line 3487 | public class ConcurrentHashMapV8<K, V>
3487		* of all (key, value) pairs using the given reducer to
3488		* combine values, and the given basis as an identity value.
3489		*
3490	+	* @param parallelismThreshold the (estimated) number of elements
3491	+	* needed for this operation to be executed in parallel
3492		* @param transformer a function returning the transformation
3493		* for an element
3494		* @param basis the identity (initial default value) for the reduction
3495		* @param reducer a commutative associative combining function
3496		* @return the result of accumulating the given transformation
3497		* of all (key, value) pairs
3498	+	* @since 1.8
3499		*/
3500	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3501	<	double basis,
3502	<	DoubleByDoubleToDouble reducer) {
3503	<	return ForkJoinTasks.reduceToDouble
3504	<	(this, transformer, basis, reducer).invoke();
3500	>	public double reduceToDoubleIn(long parallelismThreshold,
3501	>	ObjectByObjectToDouble<? super K, ? super V> transformer,
3502	>	double basis,
3503	>	DoubleByDoubleToDouble reducer) {
3504	>	if (transformer == null || reducer == null)
3505	>	throw new NullPointerException();
3506	>	return new MapReduceMappingsToDoubleTask<K,V>
3507	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3508	>	null, transformer, basis, reducer).invoke();
3509		}
3510
3511		/**
#	Line 3527 | Line 3513 | public class ConcurrentHashMapV8<K, V>
3513		* of all (key, value) pairs using the given reducer to
3514		* combine values, and the given basis as an identity value.
3515		*
3516	+	* @param parallelismThreshold the (estimated) number of elements
3517	+	* needed for this operation to be executed in parallel
3518		* @param transformer a function returning the transformation
3519		* for an element
3520		* @param basis the identity (initial default value) for the reduction
3521		* @param reducer a commutative associative combining function
3522		* @return the result of accumulating the given transformation
3523		* of all (key, value) pairs
3524	+	* @since 1.8
3525		*/
3526	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3526	>	public long reduceToLong(long parallelismThreshold,
3527	>	ObjectByObjectToLong<? super K, ? super V> transformer,
3528		long basis,
3529		LongByLongToLong reducer) {
3530	<	return ForkJoinTasks.reduceToLong
3531	<	(this, transformer, basis, reducer).invoke();
3530	>	if (transformer == null || reducer == null)
3531	>	throw new NullPointerException();
3532	>	return new MapReduceMappingsToLongTask<K,V>
3533	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3534	>	null, transformer, basis, reducer).invoke();
3535		}
3536
3537		/**
#	Line 3546 | Line 3539 | public class ConcurrentHashMapV8<K, V>
3539		* of all (key, value) pairs using the given reducer to
3540		* combine values, and the given basis as an identity value.
3541		*
3542	+	* @param parallelismThreshold the (estimated) number of elements
3543	+	* needed for this operation to be executed in parallel
3544		* @param transformer a function returning the transformation
3545		* for an element
3546		* @param basis the identity (initial default value) for the reduction
3547		* @param reducer a commutative associative combining function
3548		* @return the result of accumulating the given transformation
3549		* of all (key, value) pairs
3550	+	* @since 1.8
3551		*/
3552	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3552	>	public int reduceToInt(long parallelismThreshold,
3553	>	ObjectByObjectToInt<? super K, ? super V> transformer,
3554		int basis,
3555		IntByIntToInt reducer) {
3556	<	return ForkJoinTasks.reduceToInt
3557	<	(this, transformer, basis, reducer).invoke();
3556	>	if (transformer == null || reducer == null)
3557	>	throw new NullPointerException();
3558	>	return new MapReduceMappingsToIntTask<K,V>
3559	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3560	>	null, transformer, basis, reducer).invoke();
3561		}
3562
3563		/**
3564		* Performs the given action for each key.
3565		*
3566	+	* @param parallelismThreshold the (estimated) number of elements
3567	+	* needed for this operation to be executed in parallel
3568		* @param action the action
3569	+	* @since 1.8
3570		*/
3571	<	public void forEachKey(Action<K> action) {
3572	<	ForkJoinTasks.forEachKey
3573	<	(this, action).invoke();
3571	>	public void forEachKey(long parallelismThreshold,
3572	>	Action<? super K> action) {
3573	>	if (action == null) throw new NullPointerException();
3574	>	new ForEachKeyTask<K,V>
3575	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3576	>	action).invoke();
3577		}
3578
3579		/**
3580		* Performs the given action for each non-null transformation
3581		* of each key.
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, or null of there is no transformation (in
3587	<	* which case the action is not applied).
3586	>	* for an element, or null if there is no transformation (in
3587	>	* which case the action is not applied)
3588		* @param action the action
3589	+	* @since 1.8
3590		*/
3591	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3592	<	Action<U> action) {
3593	<	ForkJoinTasks.forEachKey
3594	<	(this, transformer, action).invoke();
3591	>	public <U> void forEachKey(long parallelismThreshold,
3592	>	Fun<? super K, ? extends U> transformer,
3593	>	Action<? super U> action) {
3594	>	if (transformer == null || action == null)
3595	>	throw new NullPointerException();
3596	>	new ForEachTransformedKeyTask<K,V,U>
3597	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3598	>	transformer, action).invoke();
3599		}
3600
3601		/**
#	Line 3592 | Line 3605 | public class ConcurrentHashMapV8<K, V>
3605		* any other parallel invocations of the search function are
3606		* ignored.
3607		*
3608	+	* @param parallelismThreshold the (estimated) number of elements
3609	+	* needed for this operation to be executed in parallel
3610		* @param searchFunction a function returning a non-null
3611		* result on success, else null
3612		* @return a non-null result from applying the given search
3613		* function on each key, or null if none
3614	+	* @since 1.8
3615		*/
3616	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3617	<	return ForkJoinTasks.searchKeys
3618	<	(this, searchFunction).invoke();
3616	>	public <U> U searchKeys(long parallelismThreshold,
3617	>	Fun<? super K, ? extends U> searchFunction) {
3618	>	if (searchFunction == null) throw new NullPointerException();
3619	>	return new SearchKeysTask<K,V,U>
3620	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3621	>	searchFunction, new AtomicReference<U>()).invoke();
3622		}
3623
3624		/**
3625		* Returns the result of accumulating all keys using the given
3626		* reducer to combine values, or null if none.
3627		*
3628	+	* @param parallelismThreshold the (estimated) number of elements
3629	+	* needed for this operation to be executed in parallel
3630		* @param reducer a commutative associative combining function
3631		* @return the result of accumulating all keys using the given
3632		* reducer to combine values, or null if none
3633	+	* @since 1.8
3634		*/
3635	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3636	<	return ForkJoinTasks.reduceKeys
3637	<	(this, reducer).invoke();
3635	>	public K reduceKeys(long parallelismThreshold,
3636	>	BiFun<? super K, ? super K, ? extends K> reducer) {
3637	>	if (reducer == null) throw new NullPointerException();
3638	>	return new ReduceKeysTask<K,V>
3639	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3640	>	null, reducer).invoke();
3641		}
3642
3643		/**
#	Line 3620 | Line 3645 | public class ConcurrentHashMapV8<K, V>
3645		* of all keys using the given reducer to combine values, or
3646		* null if none.
3647		*
3648	+	* @param parallelismThreshold the (estimated) number of elements
3649	+	* needed for this operation to be executed in parallel
3650		* @param transformer a function returning the transformation
3651	<	* for an element, or null of there is no transformation (in
3652	<	* which case it is not combined).
3651	>	* for an element, or null if there is no transformation (in
3652	>	* which case it is not combined)
3653		* @param reducer a commutative associative combining function
3654		* @return the result of accumulating the given transformation
3655		* of all keys
3656	+	* @since 1.8
3657		*/
3658	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3659	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3660	<	return ForkJoinTasks.reduceKeys
3661	<	(this, transformer, reducer).invoke();
3658	>	public <U> U reduceKeys(long parallelismThreshold,
3659	>	Fun<? super K, ? extends U> transformer,
3660	>	BiFun<? super U, ? super U, ? extends U> reducer) {
3661	>	if (transformer == null || reducer == null)
3662	>	throw new NullPointerException();
3663	>	return new MapReduceKeysTask<K,V,U>
3664	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3665	>	null, transformer, reducer).invoke();
3666		}
3667
3668		/**
#	Line 3638 | Line 3670 | public class ConcurrentHashMapV8<K, V>
3670		* of all keys using the given reducer to combine values, and
3671		* the given basis as an identity value.
3672		*
3673	+	* @param parallelismThreshold the (estimated) number of elements
3674	+	* needed for this operation to be executed in parallel
3675		* @param transformer a function returning the transformation
3676		* for an element
3677		* @param basis the identity (initial default value) for the reduction
3678		* @param reducer a commutative associative combining function
3679	<	* @return  the result of accumulating the given transformation
3679	>	* @return the result of accumulating the given transformation
3680		* of all keys
3681	+	* @since 1.8
3682		*/
3683	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3683	>	public double reduceKeysToDouble(long parallelismThreshold,
3684	>	ObjectToDouble<? super K> transformer,
3685		double basis,
3686		DoubleByDoubleToDouble reducer) {
3687	<	return ForkJoinTasks.reduceKeysToDouble
3688	<	(this, transformer, basis, reducer).invoke();
3687	>	if (transformer == null || reducer == null)
3688	>	throw new NullPointerException();
3689	>	return new MapReduceKeysToDoubleTask<K,V>
3690	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3691	>	null, transformer, basis, reducer).invoke();
3692		}
3693
3694		/**
#	Line 3657 | Line 3696 | public class ConcurrentHashMapV8<K, V>
3696		* of all keys using the given reducer to combine values, and
3697		* the given basis as an identity value.
3698		*
3699	+	* @param parallelismThreshold the (estimated) number of elements
3700	+	* needed for this operation to be executed in parallel
3701		* @param transformer a function returning the transformation
3702		* for an element
3703		* @param basis the identity (initial default value) for the reduction
3704		* @param reducer a commutative associative combining function
3705		* @return the result of accumulating the given transformation
3706		* of all keys
3707	+	* @since 1.8
3708		*/
3709	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3709	>	public long reduceKeysToLong(long parallelismThreshold,
3710	>	ObjectToLong<? super K> transformer,
3711		long basis,
3712		LongByLongToLong reducer) {
3713	<	return ForkJoinTasks.reduceKeysToLong
3714	<	(this, transformer, basis, reducer).invoke();
3713	>	if (transformer == null || reducer == null)
3714	>	throw new NullPointerException();
3715	>	return new MapReduceKeysToLongTask<K,V>
3716	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3717	>	null, transformer, basis, reducer).invoke();
3718		}
3719
3720		/**
#	Line 3676 | Line 3722 | public class ConcurrentHashMapV8<K, V>
3722		* of all keys using the given reducer to combine values, and
3723		* the given basis as an identity value.
3724		*
3725	+	* @param parallelismThreshold the (estimated) number of elements
3726	+	* needed for this operation to be executed in parallel
3727		* @param transformer a function returning the transformation
3728		* for an element
3729		* @param basis the identity (initial default value) for the reduction
3730		* @param reducer a commutative associative combining function
3731		* @return the result of accumulating the given transformation
3732		* of all keys
3733	+	* @since 1.8
3734		*/
3735	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3735	>	public int reduceKeysToInt(long parallelismThreshold,
3736	>	ObjectToInt<? super K> transformer,
3737		int basis,
3738		IntByIntToInt reducer) {
3739	<	return ForkJoinTasks.reduceKeysToInt
3740	<	(this, transformer, basis, reducer).invoke();
3739	>	if (transformer == null || reducer == null)
3740	>	throw new NullPointerException();
3741	>	return new MapReduceKeysToIntTask<K,V>
3742	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3743	>	null, transformer, basis, reducer).invoke();
3744		}
3745
3746		/**
3747		* Performs the given action for each value.
3748		*
3749	+	* @param parallelismThreshold the (estimated) number of elements
3750	+	* needed for this operation to be executed in parallel
3751		* @param action the action
3752	+	* @since 1.8
3753		*/
3754	<	public void forEachValue(Action<V> action) {
3755	<	ForkJoinTasks.forEachValue
3756	<	(this, action).invoke();
3754	>	public void forEachValue(long parallelismThreshold,
3755	>	Action<? super V> action) {
3756	>	if (action == null)
3757	>	throw new NullPointerException();
3758	>	new ForEachValueTask<K,V>
3759	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3760	>	action).invoke();
3761		}
3762
3763		/**
3764		* Performs the given action for each non-null transformation
3765		* of each value.
3766		*
3767	+	* @param parallelismThreshold the (estimated) number of elements
3768	+	* needed for this operation to be executed in parallel
3769		* @param transformer a function returning the transformation
3770	<	* for an element, or null of there is no transformation (in
3771	<	* which case the action is not applied).
3770	>	* for an element, or null if there is no transformation (in
3771	>	* which case the action is not applied)
3772	>	* @param action the action
3773	>	* @since 1.8
3774		*/
3775	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3776	<	Action<U> action) {
3777	<	ForkJoinTasks.forEachValue
3778	<	(this, transformer, action).invoke();
3775	>	public <U> void forEachValue(long parallelismThreshold,
3776	>	Fun<? super V, ? extends U> transformer,
3777	>	Action<? super U> action) {
3778	>	if (transformer == null || action == null)
3779	>	throw new NullPointerException();
3780	>	new ForEachTransformedValueTask<K,V,U>
3781	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3782	>	transformer, action).invoke();
3783		}
3784
3785		/**
#	Line 3721 | Line 3789 | public class ConcurrentHashMapV8<K, V>
3789		* any other parallel invocations of the search function are
3790		* ignored.
3791		*
3792	+	* @param parallelismThreshold the (estimated) number of elements
3793	+	* needed for this operation to be executed in parallel
3794		* @param searchFunction a function returning a non-null
3795		* result on success, else null
3796		* @return a non-null result from applying the given search
3797		* function on each value, or null if none
3798	<	*
3798	>	* @since 1.8
3799		*/
3800	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3801	<	return ForkJoinTasks.searchValues
3802	<	(this, searchFunction).invoke();
3800	>	public <U> U searchValues(long parallelismThreshold,
3801	>	Fun<? super V, ? extends U> searchFunction) {
3802	>	if (searchFunction == null) throw new NullPointerException();
3803	>	return new SearchValuesTask<K,V,U>
3804	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3805	>	searchFunction, new AtomicReference<U>()).invoke();
3806		}
3807
3808		/**
3809		* Returns the result of accumulating all values using the
3810		* given reducer to combine values, or null if none.
3811		*
3812	+	* @param parallelismThreshold the (estimated) number of elements
3813	+	* needed for this operation to be executed in parallel
3814		* @param reducer a commutative associative combining function
3815	<	* @return  the result of accumulating all values
3815	>	* @return the result of accumulating all values
3816	>	* @since 1.8
3817		*/
3818	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3819	<	return ForkJoinTasks.reduceValues
3820	<	(this, reducer).invoke();
3818	>	public V reduceValues(long parallelismThreshold,
3819	>	BiFun<? super V, ? super V, ? extends V> reducer) {
3820	>	if (reducer == null) throw new NullPointerException();
3821	>	return new ReduceValuesTask<K,V>
3822	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3823	>	null, reducer).invoke();
3824		}
3825
3826		/**
#	Line 3749 | Line 3828 | public class ConcurrentHashMapV8<K, V>
3828		* of all values using the given reducer to combine values, or
3829		* null if none.
3830		*
3831	+	* @param parallelismThreshold the (estimated) number of elements
3832	+	* needed for this operation to be executed in parallel
3833		* @param transformer a function returning the transformation
3834	<	* for an element, or null of there is no transformation (in
3835	<	* which case it is not combined).
3834	>	* for an element, or null if there is no transformation (in
3835	>	* which case it is not combined)
3836		* @param reducer a commutative associative combining function
3837		* @return the result of accumulating the given transformation
3838		* of all values
3839	+	* @since 1.8
3840		*/
3841	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3841	>	public <U> U reduceValues(long parallelismThreshold,
3842	>	Fun<? super V, ? extends U> transformer,
3843		BiFun<? super U, ? super U, ? extends U> reducer) {
3844	<	return ForkJoinTasks.reduceValues
3845	<	(this, transformer, reducer).invoke();
3844	>	if (transformer == null || reducer == null)
3845	>	throw new NullPointerException();
3846	>	return new MapReduceValuesTask<K,V,U>
3847	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3848	>	null, transformer, reducer).invoke();
3849		}
3850
3851		/**
#	Line 3767 | Line 3853 | public class ConcurrentHashMapV8<K, V>
3853		* of all values using the given reducer to combine values,
3854		* and the given basis as an identity value.
3855		*
3856	+	* @param parallelismThreshold the (estimated) number of elements
3857	+	* needed for this operation to be executed in parallel
3858		* @param transformer a function returning the transformation
3859		* for an element
3860		* @param basis the identity (initial default value) for the reduction
3861		* @param reducer a commutative associative combining function
3862		* @return the result of accumulating the given transformation
3863		* of all values
3864	+	* @since 1.8
3865		*/
3866	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
3866	>	public double reduceValuesToDouble(long parallelismThreshold,
3867	>	ObjectToDouble<? super V> transformer,
3868		double basis,
3869		DoubleByDoubleToDouble reducer) {
3870	<	return ForkJoinTasks.reduceValuesToDouble
3871	<	(this, transformer, basis, reducer).invoke();
3870	>	if (transformer == null || reducer == null)
3871	>	throw new NullPointerException();
3872	>	return new MapReduceValuesToDoubleTask<K,V>
3873	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3874	>	null, transformer, basis, reducer).invoke();
3875		}
3876
3877		/**
#	Line 3786 | Line 3879 | public class ConcurrentHashMapV8<K, V>
3879		* of all values using the given reducer to combine values,
3880		* and the given basis as an identity value.
3881		*
3882	+	* @param parallelismThreshold the (estimated) number of elements
3883	+	* needed for this operation to be executed in parallel
3884		* @param transformer a function returning the transformation
3885		* for an element
3886		* @param basis the identity (initial default value) for the reduction
3887		* @param reducer a commutative associative combining function
3888		* @return the result of accumulating the given transformation
3889		* of all values
3890	+	* @since 1.8
3891		*/
3892	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
3892	>	public long reduceValuesToLong(long parallelismThreshold,
3893	>	ObjectToLong<? super V> transformer,
3894		long basis,
3895		LongByLongToLong reducer) {
3896	<	return ForkJoinTasks.reduceValuesToLong
3897	<	(this, transformer, basis, reducer).invoke();
3896	>	if (transformer == null || reducer == null)
3897	>	throw new NullPointerException();
3898	>	return new MapReduceValuesToLongTask<K,V>
3899	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3900	>	null, transformer, basis, reducer).invoke();
3901		}
3902
3903		/**
#	Line 3805 | Line 3905 | public class ConcurrentHashMapV8<K, V>
3905		* of all values using the given reducer to combine values,
3906		* and the given basis as an identity value.
3907		*
3908	+	* @param parallelismThreshold the (estimated) number of elements
3909	+	* needed for this operation to be executed in parallel
3910		* @param transformer a function returning the transformation
3911		* for an element
3912		* @param basis the identity (initial default value) for the reduction
3913		* @param reducer a commutative associative combining function
3914		* @return the result of accumulating the given transformation
3915		* of all values
3916	+	* @since 1.8
3917		*/
3918	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
3918	>	public int reduceValuesToInt(long parallelismThreshold,
3919	>	ObjectToInt<? super V> transformer,
3920		int basis,
3921		IntByIntToInt reducer) {
3922	<	return ForkJoinTasks.reduceValuesToInt
3923	<	(this, transformer, basis, reducer).invoke();
3922	>	if (transformer == null || reducer == null)
3923	>	throw new NullPointerException();
3924	>	return new MapReduceValuesToIntTask<K,V>
3925	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3926	>	null, transformer, basis, reducer).invoke();
3927		}
3928
3929		/**
3930		* Performs the given action for each entry.
3931		*
3932	+	* @param parallelismThreshold the (estimated) number of elements
3933	+	* needed for this operation to be executed in parallel
3934		* @param action the action
3935	+	* @since 1.8
3936		*/
3937	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
3938	<	ForkJoinTasks.forEachEntry
3939	<	(this, action).invoke();
3937	>	public void forEachEntry(long parallelismThreshold,
3938	>	Action<? super Map.Entry<K,V>> action) {
3939	>	if (action == null) throw new NullPointerException();
3940	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
3941	>	action).invoke();
3942		}
3943
3944		/**
3945		* Performs the given action for each non-null transformation
3946		* of each entry.
3947		*
3948	+	* @param parallelismThreshold the (estimated) number of elements
3949	+	* needed for this operation to be executed in parallel
3950		* @param transformer a function returning the transformation
3951	<	* for an element, or null of there is no transformation (in
3952	<	* which case the action is not applied).
3951	>	* for an element, or null if there is no transformation (in
3952	>	* which case the action is not applied)
3953		* @param action the action
3954	+	* @since 1.8
3955		*/
3956	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
3957	<	Action<U> action) {
3958	<	ForkJoinTasks.forEachEntry
3959	<	(this, transformer, action).invoke();
3956	>	public <U> void forEachEntry(long parallelismThreshold,
3957	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
3958	>	Action<? super U> action) {
3959	>	if (transformer == null || action == null)
3960	>	throw new NullPointerException();
3961	>	new ForEachTransformedEntryTask<K,V,U>
3962	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3963	>	transformer, action).invoke();
3964		}
3965
3966		/**
#	Line 3851 | Line 3970 | public class ConcurrentHashMapV8<K, V>
3970		* any other parallel invocations of the search function are
3971		* ignored.
3972		*
3973	+	* @param parallelismThreshold the (estimated) number of elements
3974	+	* needed for this operation to be executed in parallel
3975		* @param searchFunction a function returning a non-null
3976		* result on success, else null
3977		* @return a non-null result from applying the given search
3978		* function on each entry, or null if none
3979	+	* @since 1.8
3980		*/
3981	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
3982	<	return ForkJoinTasks.searchEntries
3983	<	(this, searchFunction).invoke();
3981	>	public <U> U searchEntries(long parallelismThreshold,
3982	>	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
3983	>	if (searchFunction == null) throw new NullPointerException();
3984	>	return new SearchEntriesTask<K,V,U>
3985	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3986	>	searchFunction, new AtomicReference<U>()).invoke();
3987		}
3988
3989		/**
3990		* Returns the result of accumulating all entries using the
3991		* given reducer to combine values, or null if none.
3992		*
3993	+	* @param parallelismThreshold the (estimated) number of elements
3994	+	* needed for this operation to be executed in parallel
3995		* @param reducer a commutative associative combining function
3996		* @return the result of accumulating all entries
3997	+	* @since 1.8
3998		*/
3999	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4000	<	return ForkJoinTasks.reduceEntries
4001	<	(this, reducer).invoke();
3999	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4000	>	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4001	>	if (reducer == null) throw new NullPointerException();
4002	>	return new ReduceEntriesTask<K,V>
4003	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4004	>	null, reducer).invoke();
4005		}
4006
4007		/**
#	Line 3878 | Line 4009 | public class ConcurrentHashMapV8<K, V>
4009		* of all entries using the given reducer to combine values,
4010		* or null if none.
4011		*
4012	+	* @param parallelismThreshold the (estimated) number of elements
4013	+	* needed for this operation to be executed in parallel
4014		* @param transformer a function returning the transformation
4015	<	* for an element, or null of there is no transformation (in
4016	<	* which case it is not combined).
4015	>	* for an element, or null if there is no transformation (in
4016	>	* which case it is not combined)
4017		* @param reducer a commutative associative combining function
4018		* @return the result of accumulating the given transformation
4019		* of all entries
4020	+	* @since 1.8
4021		*/
4022	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4022	>	public <U> U reduceEntries(long parallelismThreshold,
4023	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4024		BiFun<? super U, ? super U, ? extends U> reducer) {
4025	<	return ForkJoinTasks.reduceEntries
4026	<	(this, transformer, reducer).invoke();
4025	>	if (transformer == null || reducer == null)
4026	>	throw new NullPointerException();
4027	>	return new MapReduceEntriesTask<K,V,U>
4028	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4029	>	null, transformer, reducer).invoke();
4030		}
4031
4032		/**
#	Line 3896 | Line 4034 | public class ConcurrentHashMapV8<K, V>
4034		* of all entries using the given reducer to combine values,
4035		* and the given basis as an identity value.
4036		*
4037	+	* @param parallelismThreshold the (estimated) number of elements
4038	+	* needed for this operation to be executed in parallel
4039		* @param transformer a function returning the transformation
4040		* for an element
4041		* @param basis the identity (initial default value) for the reduction
4042		* @param reducer a commutative associative combining function
4043		* @return the result of accumulating the given transformation
4044		* of all entries
4045	+	* @since 1.8
4046		*/
4047	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4047	>	public double reduceEntriesToDouble(long parallelismThreshold,
4048	>	ObjectToDouble<Map.Entry<K,V>> transformer,
4049		double basis,
4050		DoubleByDoubleToDouble reducer) {
4051	<	return ForkJoinTasks.reduceEntriesToDouble
4052	<	(this, transformer, basis, reducer).invoke();
4051	>	if (transformer == null || reducer == null)
4052	>	throw new NullPointerException();
4053	>	return new MapReduceEntriesToDoubleTask<K,V>
4054	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4055	>	null, transformer, basis, reducer).invoke();
4056		}
4057
4058		/**
#	Line 3915 | Line 4060 | public class ConcurrentHashMapV8<K, V>
4060		* of all entries using the given reducer to combine values,
4061		* and the given basis as an identity value.
4062		*
4063	+	* @param parallelismThreshold the (estimated) number of elements
4064	+	* needed for this operation to be executed in parallel
4065		* @param transformer a function returning the transformation
4066		* for an element
4067		* @param basis the identity (initial default value) for the reduction
4068		* @param reducer a commutative associative combining function
4069	<	* @return  the result of accumulating the given transformation
4069	>	* @return the result of accumulating the given transformation
4070		* of all entries
4071	+	* @since 1.8
4072		*/
4073	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4073	>	public long reduceEntriesToLong(long parallelismThreshold,
4074	>	ObjectToLong<Map.Entry<K,V>> transformer,
4075		long basis,
4076		LongByLongToLong reducer) {
4077	<	return ForkJoinTasks.reduceEntriesToLong
4078	<	(this, transformer, basis, reducer).invoke();
4077	>	if (transformer == null || reducer == null)
4078	>	throw new NullPointerException();
4079	>	return new MapReduceEntriesToLongTask<K,V>
4080	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4081	>	null, transformer, basis, reducer).invoke();
4082		}
4083
4084		/**
#	Line 3934 | Line 4086 | public class ConcurrentHashMapV8<K, V>
4086		* of all entries using the given reducer to combine values,
4087		* and the given basis as an identity value.
4088		*
4089	+	* @param parallelismThreshold the (estimated) number of elements
4090	+	* needed for this operation to be executed in parallel
4091		* @param transformer a function returning the transformation
4092		* for an element
4093		* @param basis the identity (initial default value) for the reduction
4094		* @param reducer a commutative associative combining function
4095		* @return the result of accumulating the given transformation
4096		* of all entries
4097	+	* @since 1.8
4098		*/
4099	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4099	>	public int reduceEntriesToInt(long parallelismThreshold,
4100	>	ObjectToInt<Map.Entry<K,V>> transformer,
4101		int basis,
4102		IntByIntToInt reducer) {
4103	<	return ForkJoinTasks.reduceEntriesToInt
4104	<	(this, transformer, basis, reducer).invoke();
4103	>	if (transformer == null || reducer == null)
4104	>	throw new NullPointerException();
4105	>	return new MapReduceEntriesToIntTask<K,V>
4106	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4107	>	null, transformer, basis, reducer).invoke();
4108		}
4109
4110	+
4111		/* ----------------Views -------------- */
4112
4113		/**
4114		* Base class for views.
4115		*/
4116	<	static abstract class CHMView<K, V> {
4117	<	final ConcurrentHashMapV8<K, V> map;
4118	<	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
4116	>	abstract static class CollectionView<K,V,E>
4117	>	implements Collection<E>, java.io.Serializable {
4118	>	private static final long serialVersionUID = 7249069246763182397L;
4119	>	final ConcurrentHashMapV8<K,V> map;
4120	>	CollectionView(ConcurrentHashMapV8<K,V> map)  { this.map = map; }
4121
4122		/**
4123		* Returns the map backing this view.
#	Line 3964 | Line 4126 | public class ConcurrentHashMapV8<K, V>
4126		*/
4127		public ConcurrentHashMapV8<K,V> getMap() { return map; }
4128
4129	<	public final int size()                 { return map.size(); }
4130	<	public final boolean isEmpty()          { return map.isEmpty(); }
4131	<	public final void clear()               { map.clear(); }
4129	>	/**
4130	>	* Removes all of the elements from this view, by removing all
4131	>	* the mappings from the map backing this view.
4132	>	*/
4133	>	public final void clear()      { map.clear(); }
4134	>	public final int size()        { return map.size(); }
4135	>	public final boolean isEmpty() { return map.isEmpty(); }
4136
4137		// implementations below rely on concrete classes supplying these
4138	<	abstract public Iterator<?> iterator();
4139	<	abstract public boolean contains(Object o);
4140	<	abstract public boolean remove(Object o);
4138	>	// abstract methods
4139	>	/**
4140	>	* Returns a "weakly consistent" iterator that will never
4141	>	* throw {@link ConcurrentModificationException}, and
4142	>	* guarantees to traverse elements as they existed upon
4143	>	* construction of the iterator, and may (but is not
4144	>	* guaranteed to) reflect any modifications subsequent to
4145	>	* construction.
4146	>	*/
4147	>	public abstract Iterator<E> iterator();
4148	>	public abstract boolean contains(Object o);
4149	>	public abstract boolean remove(Object o);
4150
4151		private static final String oomeMsg = "Required array size too large";
4152
4153		public final Object[] toArray() {
4154		long sz = map.mappingCount();
4155	<	if (sz > (long)(MAX_ARRAY_SIZE))
4155	>	if (sz > MAX_ARRAY_SIZE)
4156		throw new OutOfMemoryError(oomeMsg);
4157		int n = (int)sz;
4158		Object[] r = new Object[n];
4159		int i = 0;
4160	<	Iterator<?> it = iterator();
3986	<	while (it.hasNext()) {
4160	>	for (E e : this) {
4161		if (i == n) {
4162		if (n >= MAX_ARRAY_SIZE)
4163		throw new OutOfMemoryError(oomeMsg);
#	Line 3993 | Line 4167 | public class ConcurrentHashMapV8<K, V>
4167		n += (n >>> 1) + 1;
4168		r = Arrays.copyOf(r, n);
4169		}
4170	<	r[i++] = it.next();
4170	>	r[i++] = e;
4171		}
4172		return (i == n) ? r : Arrays.copyOf(r, i);
4173		}
4174
4175	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4175	>	@SuppressWarnings("unchecked")
4176	>	public final <T> T[] toArray(T[] a) {
4177		long sz = map.mappingCount();
4178	<	if (sz > (long)(MAX_ARRAY_SIZE))
4178	>	if (sz > MAX_ARRAY_SIZE)
4179		throw new OutOfMemoryError(oomeMsg);
4180		int m = (int)sz;
4181		T[] r = (a.length >= m) ? a :
#	Line 4008 | Line 4183 | public class ConcurrentHashMapV8<K, V>
4183		.newInstance(a.getClass().getComponentType(), m);
4184		int n = r.length;
4185		int i = 0;
4186	<	Iterator<?> it = iterator();
4012	<	while (it.hasNext()) {
4186	>	for (E e : this) {
4187		if (i == n) {
4188		if (n >= MAX_ARRAY_SIZE)
4189		throw new OutOfMemoryError(oomeMsg);
#	Line 4019 | Line 4193 | public class ConcurrentHashMapV8<K, V>
4193		n += (n >>> 1) + 1;
4194		r = Arrays.copyOf(r, n);
4195		}
4196	<	r[i++] = (T)it.next();
4196	>	r[i++] = (T)e;
4197		}
4198		if (a == r && i < n) {
4199		r[i] = null; // null-terminate
#	Line 4028 | Line 4202 | public class ConcurrentHashMapV8<K, V>
4202		return (i == n) ? r : Arrays.copyOf(r, i);
4203		}
4204
4205	<	public final int hashCode() {
4206	<	int h = 0;
4207	<	for (Iterator<?> it = iterator(); it.hasNext();)
4208	<	h += it.next().hashCode();
4209	<	return h;
4210	<	}
4211	<
4205	>	/**
4206	>	* Returns a string representation of this collection.
4207	>	* The string representation consists of the string representations
4208	>	* of the collection's elements in the order they are returned by
4209	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4210	>	* Adjacent elements are separated by the characters {@code ", "}
4211	>	* (comma and space).  Elements are converted to strings as by
4212	>	* {@link String#valueOf(Object)}.
4213	>	*
4214	>	* @return a string representation of this collection
4215	>	*/
4216		public final String toString() {
4217		StringBuilder sb = new StringBuilder();
4218		sb.append('[');
4219	<	Iterator<?> it = iterator();
4219	>	Iterator<E> it = iterator();
4220		if (it.hasNext()) {
4221		for (;;) {
4222		Object e = it.next();
#	Line 4053 | Line 4231 | public class ConcurrentHashMapV8<K, V>
4231
4232		public final boolean containsAll(Collection<?> c) {
4233		if (c != this) {
4234	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
4057	<	Object e = it.next();
4234	>	for (Object e : c) {
4235		if (e == null || !contains(e))
4236		return false;
4237		}
#	Line 4064 | Line 4241 | public class ConcurrentHashMapV8<K, V>
4241
4242		public final boolean removeAll(Collection<?> c) {
4243		boolean modified = false;
4244	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4244	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4245		if (c.contains(it.next())) {
4246		it.remove();
4247		modified = true;
#	Line 4075 | Line 4252 | public class ConcurrentHashMapV8<K, V>
4252
4253		public final boolean retainAll(Collection<?> c) {
4254		boolean modified = false;
4255	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4255	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4256		if (!c.contains(it.next())) {
4257		it.remove();
4258		modified = true;
#	Line 4089 | Line 4266 | public class ConcurrentHashMapV8<K, V>
4266		/**
4267		* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4268		* which additions may optionally be enabled by mapping to a
4269	<	* common value.  This class cannot be directly instantiated. See
4270	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4271	<	* {@link #newKeySet(int)}.
4269	>	* common value.  This class cannot be directly instantiated.
4270	>	* See {@link #keySet() keySet()},
4271	>	* {@link #keySet(Object) keySet(V)},
4272	>	* {@link #newKeySet() newKeySet()},
4273	>	* {@link #newKeySet(int) newKeySet(int)}.
4274	>	*
4275	>	* @since 1.8
4276		*/
4277	<	public static class KeySetView<K,V> extends CHMView<K,V> implements Set<K>, java.io.Serializable {
4277	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4278	>	implements Set<K>, java.io.Serializable {
4279		private static final long serialVersionUID = 7249069246763182397L;
4280		private final V value;
4281	<	KeySetView(ConcurrentHashMapV8<K, V> map, V value) {  // non-public
4281	>	KeySetView(ConcurrentHashMapV8<K,V> map, V value) {  // non-public
4282		super(map);
4283		this.value = value;
4284		}
#	Line 4106 | Line 4288 | public class ConcurrentHashMapV8<K, V>
4288		* or {@code null} if additions are not supported.
4289		*
4290		* @return the default mapped value for additions, or {@code null}
4291	<	* if not supported.
4291	>	* if not supported
4292		*/
4293		public V getMappedValue() { return value; }
4294
4295	<	// implement Set API
4296	<
4295	>	/**
4296	>	* {@inheritDoc}
4297	>	* @throws NullPointerException if the specified key is null
4298	>	*/
4299		public boolean contains(Object o) { return map.containsKey(o); }
4116	–	public boolean remove(Object o)   { return map.remove(o) != null; }
4300
4301		/**
4302	<	* Returns a "weakly consistent" iterator that will never
4303	<	* throw {@link ConcurrentModificationException}, and
4304	<	* guarantees to traverse elements as they existed upon
4305	<	* construction of the iterator, and may (but is not
4306	<	* guaranteed to) reflect any modifications subsequent to
4307	<	* construction.
4302	>	* Removes the key from this map view, by removing the key (and its
4303	>	* corresponding value) from the backing map.  This method does
4304	>	* nothing if the key is not in the map.
4305	>	*
4306	>	* @param  o the key to be removed from the backing map
4307	>	* @return {@code true} if the backing map contained the specified key
4308	>	* @throws NullPointerException if the specified key is null
4309	>	*/
4310	>	public boolean remove(Object o) { return map.remove(o) != null; }
4311	>
4312	>	/**
4313	>	* @return an iterator over the keys of the backing map
4314	>	*/
4315	>	public Iterator<K> iterator() {
4316	>	Node<K,V>[] t;
4317	>	ConcurrentHashMapV8<K,V> m = map;
4318	>	int f = (t = m.table) == null ? 0 : t.length;
4319	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4320	>	}
4321	>
4322	>	/**
4323	>	* Adds the specified key to this set view by mapping the key to
4324	>	* the default mapped value in the backing map, if defined.
4325		*
4326	<	* @return an iterator over the keys of this map
4326	>	* @param e key to be added
4327	>	* @return {@code true} if this set changed as a result of the call
4328	>	* @throws NullPointerException if the specified key is null
4329	>	* @throws UnsupportedOperationException if no default mapped value
4330	>	* for additions was provided
4331		*/
4128	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4332		public boolean add(K e) {
4333		V v;
4334		if ((v = value) == null)
4335		throw new UnsupportedOperationException();
4336	<	if (e == null)
4134	<	throw new NullPointerException();
4135	<	return map.internalPutIfAbsent(e, v) == null;
4336	>	return map.putVal(e, v, true) == null;
4337		}
4338	+
4339	+	/**
4340	+	* Adds all of the elements in the specified collection to this set,
4341	+	* as if by calling {@link #add} on each one.
4342	+	*
4343	+	* @param c the elements to be inserted into this set
4344	+	* @return {@code true} if this set changed as a result of the call
4345	+	* @throws NullPointerException if the collection or any of its
4346	+	* elements are {@code null}
4347	+	* @throws UnsupportedOperationException if no default mapped value
4348	+	* for additions was provided
4349	+	*/
4350		public boolean addAll(Collection<? extends K> c) {
4351		boolean added = false;
4352		V v;
4353		if ((v = value) == null)
4354		throw new UnsupportedOperationException();
4355		for (K e : c) {
4356	<	if (e == null)
4144	<	throw new NullPointerException();
4145	<	if (map.internalPutIfAbsent(e, v) == null)
4356	>	if (map.putVal(e, v, true) == null)
4357		added = true;
4358		}
4359		return added;
4360		}
4361	+
4362	+	public int hashCode() {
4363	+	int h = 0;
4364	+	for (K e : this)
4365	+	h += e.hashCode();
4366	+	return h;
4367	+	}
4368	+
4369		public boolean equals(Object o) {
4370		Set<?> c;
4371		return ((o instanceof Set) &&
#	Line 4154 | Line 4373 | public class ConcurrentHashMapV8<K, V>
4373		(containsAll(c) && c.containsAll(this))));
4374		}
4375
4376	<	/**
4377	<	* Performs the given action for each key.
4378	<	*
4379	<	* @param action the action
4380	<	*/
4381	<	public void forEach(Action<K> action) {
4163	<	ForkJoinTasks.forEachKey
4164	<	(map, action).invoke();
4165	<	}
4166	<
4167	<	/**
4168	<	* Performs the given action for each non-null transformation
4169	<	* of each key.
4170	<	*
4171	<	* @param transformer a function returning the transformation
4172	<	* for an element, or null of there is no transformation (in
4173	<	* which case the action is not applied).
4174	<	* @param action the action
4175	<	*/
4176	<	public <U> void forEach(Fun<? super K, ? extends U> transformer,
4177	<	Action<U> action) {
4178	<	ForkJoinTasks.forEachKey
4179	<	(map, transformer, action).invoke();
4180	<	}
4181	<
4182	<	/**
4183	<	* Returns a non-null result from applying the given search
4184	<	* function on each key, or null if none. Upon success,
4185	<	* further element processing is suppressed and the results of
4186	<	* any other parallel invocations of the search function are
4187	<	* ignored.
4188	<	*
4189	<	* @param searchFunction a function returning a non-null
4190	<	* result on success, else null
4191	<	* @return a non-null result from applying the given search
4192	<	* function on each key, or null if none
4193	<	*/
4194	<	public <U> U search(Fun<? super K, ? extends U> searchFunction) {
4195	<	return ForkJoinTasks.searchKeys
4196	<	(map, searchFunction).invoke();
4197	<	}
4198	<
4199	<	/**
4200	<	* Returns the result of accumulating all keys using the given
4201	<	* reducer to combine values, or null if none.
4202	<	*
4203	<	* @param reducer a commutative associative combining function
4204	<	* @return the result of accumulating all keys using the given
4205	<	* reducer to combine values, or null if none
4206	<	*/
4207	<	public K reduce(BiFun<? super K, ? super K, ? extends K> reducer) {
4208	<	return ForkJoinTasks.reduceKeys
4209	<	(map, reducer).invoke();
4210	<	}
4211	<
4212	<	/**
4213	<	* Returns the result of accumulating the given transformation
4214	<	* of all keys using the given reducer to combine values, and
4215	<	* the given basis as an identity value.
4216	<	*
4217	<	* @param transformer a function returning the transformation
4218	<	* for an element
4219	<	* @param basis the identity (initial default value) for the reduction
4220	<	* @param reducer a commutative associative combining function
4221	<	* @return  the result of accumulating the given transformation
4222	<	* of all keys
4223	<	*/
4224	<	public double reduceToDouble(ObjectToDouble<? super K> transformer,
4225	<	double basis,
4226	<	DoubleByDoubleToDouble reducer) {
4227	<	return ForkJoinTasks.reduceKeysToDouble
4228	<	(map, transformer, basis, reducer).invoke();
4229	<	}
4230	<
4231	<
4232	<	/**
4233	<	* Returns the result of accumulating the given transformation
4234	<	* of all keys using the given reducer to combine values, and
4235	<	* the given basis as an identity value.
4236	<	*
4237	<	* @param transformer a function returning the transformation
4238	<	* for an element
4239	<	* @param basis the identity (initial default value) for the reduction
4240	<	* @param reducer a commutative associative combining function
4241	<	* @return the result of accumulating the given transformation
4242	<	* of all keys
4243	<	*/
4244	<	public long reduceToLong(ObjectToLong<? super K> transformer,
4245	<	long basis,
4246	<	LongByLongToLong reducer) {
4247	<	return ForkJoinTasks.reduceKeysToLong
4248	<	(map, transformer, basis, reducer).invoke();
4376	>	public ConcurrentHashMapSpliterator<K> spliterator() {
4377	>	Node<K,V>[] t;
4378	>	ConcurrentHashMapV8<K,V> m = map;
4379	>	long n = m.sumCount();
4380	>	int f = (t = m.table) == null ? 0 : t.length;
4381	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4382		}
4383
4384	<	/**
4385	<	* Returns the result of accumulating the given transformation
4386	<	* of all keys using the given reducer to combine values, and
4387	<	* the given basis as an identity value.
4388	<	*
4389	<	* @param transformer a function returning the transformation
4390	<	* for an element
4391	<	* @param basis the identity (initial default value) for the reduction
4259	<	* @param reducer a commutative associative combining function
4260	<	* @return the result of accumulating the given transformation
4261	<	* of all keys
4262	<	*/
4263	<	public int reduceToInt(ObjectToInt<? super K> transformer,
4264	<	int basis,
4265	<	IntByIntToInt reducer) {
4266	<	return ForkJoinTasks.reduceKeysToInt
4267	<	(map, transformer, basis, reducer).invoke();
4384	>	public void forEach(Action<? super K> action) {
4385	>	if (action == null) throw new NullPointerException();
4386	>	Node<K,V>[] t;
4387	>	if ((t = map.table) != null) {
4388	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4389	>	for (Node<K,V> p; (p = it.advance()) != null; )
4390	>	action.apply(p.key);
4391	>	}
4392		}
4269	–
4393		}
4394
4395		/**
4396		* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4397		* values, in which additions are disabled. This class cannot be
4398	<	* directly instantiated. See {@link #values},
4276	<	*
4277	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4278	<	* that will never throw {@link ConcurrentModificationException},
4279	<	* and guarantees to traverse elements as they existed upon
4280	<	* construction of the iterator, and may (but is not guaranteed to)
4281	<	* reflect any modifications subsequent to construction.
4398	>	* directly instantiated. See {@link #values()}.
4399		*/
4400	<	public static final class ValuesView<K,V> extends CHMView<K,V>
4401	<	implements Collection<V> {
4402	<	ValuesView(ConcurrentHashMapV8<K, V> map)   { super(map); }
4403	<	public final boolean contains(Object o) { return map.containsValue(o); }
4400	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4401	>	implements Collection<V>, java.io.Serializable {
4402	>	private static final long serialVersionUID = 2249069246763182397L;
4403	>	ValuesView(ConcurrentHashMapV8<K,V> map) { super(map); }
4404	>	public final boolean contains(Object o) {
4405	>	return map.containsValue(o);
4406	>	}
4407	>
4408		public final boolean remove(Object o) {
4409		if (o != null) {
4410	<	Iterator<V> it = new ValueIterator<K,V>(map);
4290	<	while (it.hasNext()) {
4410	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4411		if (o.equals(it.next())) {
4412		it.remove();
4413		return true;
#	Line 4297 | Line 4417 | public class ConcurrentHashMapV8<K, V>
4417		return false;
4418		}
4419
4300	–	/**
4301	–	* Returns a "weakly consistent" iterator that will never
4302	–	* throw {@link ConcurrentModificationException}, and
4303	–	* guarantees to traverse elements as they existed upon
4304	–	* construction of the iterator, and may (but is not
4305	–	* guaranteed to) reflect any modifications subsequent to
4306	–	* construction.
4307	–	*
4308	–	* @return an iterator over the values of this map
4309	–	*/
4420		public final Iterator<V> iterator() {
4421	<	return new ValueIterator<K,V>(map);
4421	>	ConcurrentHashMapV8<K,V> m = map;
4422	>	Node<K,V>[] t;
4423	>	int f = (t = m.table) == null ? 0 : t.length;
4424	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4425		}
4426	+
4427		public final boolean add(V e) {
4428		throw new UnsupportedOperationException();
4429		}
#	Line 4317 | Line 4431 | public class ConcurrentHashMapV8<K, V>
4431		throw new UnsupportedOperationException();
4432		}
4433
4434	<	/**
4435	<	* Performs the given action for each value.
4436	<	*
4437	<	* @param action the action
4438	<	*/
4439	<	public void forEach(Action<V> action) {
4326	<	ForkJoinTasks.forEachValue
4327	<	(map, action).invoke();
4328	<	}
4329	<
4330	<	/**
4331	<	* Performs the given action for each non-null transformation
4332	<	* of each value.
4333	<	*
4334	<	* @param transformer a function returning the transformation
4335	<	* for an element, or null of there is no transformation (in
4336	<	* which case the action is not applied).
4337	<	*/
4338	<	public <U> void forEach(Fun<? super V, ? extends U> transformer,
4339	<	Action<U> action) {
4340	<	ForkJoinTasks.forEachValue
4341	<	(map, transformer, action).invoke();
4342	<	}
4343	<
4344	<	/**
4345	<	* Returns a non-null result from applying the given search
4346	<	* function on each value, or null if none.  Upon success,
4347	<	* further element processing is suppressed and the results of
4348	<	* any other parallel invocations of the search function are
4349	<	* ignored.
4350	<	*
4351	<	* @param searchFunction a function returning a non-null
4352	<	* result on success, else null
4353	<	* @return a non-null result from applying the given search
4354	<	* function on each value, or null if none
4355	<	*
4356	<	*/
4357	<	public <U> U search(Fun<? super V, ? extends U> searchFunction) {
4358	<	return ForkJoinTasks.searchValues
4359	<	(map, searchFunction).invoke();
4360	<	}
4361	<
4362	<	/**
4363	<	* Returns the result of accumulating all values using the
4364	<	* given reducer to combine values, or null if none.
4365	<	*
4366	<	* @param reducer a commutative associative combining function
4367	<	* @return  the result of accumulating all values
4368	<	*/
4369	<	public V reduce(BiFun<? super V, ? super V, ? extends V> reducer) {
4370	<	return ForkJoinTasks.reduceValues
4371	<	(map, reducer).invoke();
4372	<	}
4373	<
4374	<	/**
4375	<	* Returns the result of accumulating the given transformation
4376	<	* of all values using the given reducer to combine values, or
4377	<	* null if none.
4378	<	*
4379	<	* @param transformer a function returning the transformation
4380	<	* for an element, or null of there is no transformation (in
4381	<	* which case it is not combined).
4382	<	* @param reducer a commutative associative combining function
4383	<	* @return the result of accumulating the given transformation
4384	<	* of all values
4385	<	*/
4386	<	public <U> U reduce(Fun<? super V, ? extends U> transformer,
4387	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4388	<	return ForkJoinTasks.reduceValues
4389	<	(map, transformer, reducer).invoke();
4390	<	}
4391	<
4392	<	/**
4393	<	* Returns the result of accumulating the given transformation
4394	<	* of all values using the given reducer to combine values,
4395	<	* and the given basis as an identity value.
4396	<	*
4397	<	* @param transformer a function returning the transformation
4398	<	* for an element
4399	<	* @param basis the identity (initial default value) for the reduction
4400	<	* @param reducer a commutative associative combining function
4401	<	* @return the result of accumulating the given transformation
4402	<	* of all values
4403	<	*/
4404	<	public double reduceToDouble(ObjectToDouble<? super V> transformer,
4405	<	double basis,
4406	<	DoubleByDoubleToDouble reducer) {
4407	<	return ForkJoinTasks.reduceValuesToDouble
4408	<	(map, transformer, basis, reducer).invoke();
4409	<	}
4410	<
4411	<	/**
4412	<	* Returns the result of accumulating the given transformation
4413	<	* of all values using the given reducer to combine values,
4414	<	* and the given basis as an identity value.
4415	<	*
4416	<	* @param transformer a function returning the transformation
4417	<	* for an element
4418	<	* @param basis the identity (initial default value) for the reduction
4419	<	* @param reducer a commutative associative combining function
4420	<	* @return the result of accumulating the given transformation
4421	<	* of all values
4422	<	*/
4423	<	public long reduceToLong(ObjectToLong<? super V> transformer,
4424	<	long basis,
4425	<	LongByLongToLong reducer) {
4426	<	return ForkJoinTasks.reduceValuesToLong
4427	<	(map, transformer, basis, reducer).invoke();
4434	>	public ConcurrentHashMapSpliterator<V> spliterator() {
4435	>	Node<K,V>[] t;
4436	>	ConcurrentHashMapV8<K,V> m = map;
4437	>	long n = m.sumCount();
4438	>	int f = (t = m.table) == null ? 0 : t.length;
4439	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4440		}
4441
4442	<	/**
4443	<	* Returns the result of accumulating the given transformation
4444	<	* of all values using the given reducer to combine values,
4445	<	* and the given basis as an identity value.
4446	<	*
4447	<	* @param transformer a function returning the transformation
4448	<	* for an element
4449	<	* @param basis the identity (initial default value) for the reduction
4438	<	* @param reducer a commutative associative combining function
4439	<	* @return the result of accumulating the given transformation
4440	<	* of all values
4441	<	*/
4442	<	public int reduceToInt(ObjectToInt<? super V> transformer,
4443	<	int basis,
4444	<	IntByIntToInt reducer) {
4445	<	return ForkJoinTasks.reduceValuesToInt
4446	<	(map, transformer, basis, reducer).invoke();
4442	>	public void forEach(Action<? super V> action) {
4443	>	if (action == null) throw new NullPointerException();
4444	>	Node<K,V>[] t;
4445	>	if ((t = map.table) != null) {
4446	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4447	>	for (Node<K,V> p; (p = it.advance()) != null; )
4448	>	action.apply(p.val);
4449	>	}
4450		}
4448	–
4451		}
4452
4453		/**
4454		* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4455		* entries.  This class cannot be directly instantiated. See
4456	<	* {@link #entrySet}.
4456	>	* {@link #entrySet()}.
4457		*/
4458	<	public static final class EntrySetView<K,V> extends CHMView<K,V>
4459	<	implements Set<Map.Entry<K,V>> {
4460	<	EntrySetView(ConcurrentHashMapV8<K, V> map) { super(map); }
4461	<	public final boolean contains(Object o) {
4458	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4459	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4460	>	private static final long serialVersionUID = 2249069246763182397L;
4461	>	EntrySetView(ConcurrentHashMapV8<K,V> map) { super(map); }
4462	>
4463	>	public boolean contains(Object o) {
4464		Object k, v, r; Map.Entry<?,?> e;
4465		return ((o instanceof Map.Entry) &&
4466		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4464 | Line 4468 | public class ConcurrentHashMapV8<K, V>
4468		(v = e.getValue()) != null &&
4469		(v == r || v.equals(r)));
4470		}
4471	<	public final boolean remove(Object o) {
4471	>
4472	>	public boolean remove(Object o) {
4473		Object k, v; Map.Entry<?,?> e;
4474		return ((o instanceof Map.Entry) &&
4475		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4473 | Line 4478 | public class ConcurrentHashMapV8<K, V>
4478		}
4479
4480		/**
4481	<	* Returns a "weakly consistent" iterator that will never
4477	<	* throw {@link ConcurrentModificationException}, and
4478	<	* guarantees to traverse elements as they existed upon
4479	<	* construction of the iterator, and may (but is not
4480	<	* guaranteed to) reflect any modifications subsequent to
4481	<	* construction.
4482	<	*
4483	<	* @return an iterator over the entries of this map
4481	>	* @return an iterator over the entries of the backing map
4482		*/
4483	<	public final Iterator<Map.Entry<K,V>> iterator() {
4484	<	return new EntryIterator<K,V>(map);
4483	>	public Iterator<Map.Entry<K,V>> iterator() {
4484	>	ConcurrentHashMapV8<K,V> m = map;
4485	>	Node<K,V>[] t;
4486	>	int f = (t = m.table) == null ? 0 : t.length;
4487	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4488		}
4489
4490	<	public final boolean add(Entry<K,V> e) {
4491	<	K key = e.getKey();
4491	<	V value = e.getValue();
4492	<	if (key == null || value == null)
4493	<	throw new NullPointerException();
4494	<	return map.internalPut(key, value) == null;
4490	>	public boolean add(Entry<K,V> e) {
4491	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4492		}
4493	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4493	>
4494	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4495		boolean added = false;
4496		for (Entry<K,V> e : c) {
4497		if (add(e))
#	Line 4501 | Line 4499 | public class ConcurrentHashMapV8<K, V>
4499		}
4500		return added;
4501		}
4502	<	public boolean equals(Object o) {
4502	>
4503	>	public final int hashCode() {
4504	>	int h = 0;
4505	>	Node<K,V>[] t;
4506	>	if ((t = map.table) != null) {
4507	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4508	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4509	>	h += p.hashCode();
4510	>	}
4511	>	}
4512	>	return h;
4513	>	}
4514	>
4515	>	public final boolean equals(Object o) {
4516		Set<?> c;
4517		return ((o instanceof Set) &&
4518		((c = (Set<?>)o) == this ||
4519		(containsAll(c) && c.containsAll(this))));
4520		}
4521
4522	<	/**
4523	<	* Performs the given action for each entry.
4524	<	*
4525	<	* @param action the action
4526	<	*/
4527	<	public void forEach(Action<Map.Entry<K,V>> action) {
4517	<	ForkJoinTasks.forEachEntry
4518	<	(map, action).invoke();
4519	<	}
4520	<
4521	<	/**
4522	<	* Performs the given action for each non-null transformation
4523	<	* of each entry.
4524	<	*
4525	<	* @param transformer a function returning the transformation
4526	<	* for an element, or null of there is no transformation (in
4527	<	* which case the action is not applied).
4528	<	* @param action the action
4529	<	*/
4530	<	public <U> void forEach(Fun<Map.Entry<K,V>, ? extends U> transformer,
4531	<	Action<U> action) {
4532	<	ForkJoinTasks.forEachEntry
4533	<	(map, transformer, action).invoke();
4534	<	}
4535	<
4536	<	/**
4537	<	* Returns a non-null result from applying the given search
4538	<	* function on each entry, or null if none.  Upon success,
4539	<	* further element processing is suppressed and the results of
4540	<	* any other parallel invocations of the search function are
4541	<	* ignored.
4542	<	*
4543	<	* @param searchFunction a function returning a non-null
4544	<	* result on success, else null
4545	<	* @return a non-null result from applying the given search
4546	<	* function on each entry, or null if none
4547	<	*/
4548	<	public <U> U search(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4549	<	return ForkJoinTasks.searchEntries
4550	<	(map, searchFunction).invoke();
4551	<	}
4552	<
4553	<	/**
4554	<	* Returns the result of accumulating all entries using the
4555	<	* given reducer to combine values, or null if none.
4556	<	*
4557	<	* @param reducer a commutative associative combining function
4558	<	* @return the result of accumulating all entries
4559	<	*/
4560	<	public Map.Entry<K,V> reduce(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4561	<	return ForkJoinTasks.reduceEntries
4562	<	(map, reducer).invoke();
4563	<	}
4564	<
4565	<	/**
4566	<	* Returns the result of accumulating the given transformation
4567	<	* of all entries using the given reducer to combine values,
4568	<	* or null if none.
4569	<	*
4570	<	* @param transformer a function returning the transformation
4571	<	* for an element, or null of there is no transformation (in
4572	<	* which case it is not combined).
4573	<	* @param reducer a commutative associative combining function
4574	<	* @return the result of accumulating the given transformation
4575	<	* of all entries
4576	<	*/
4577	<	public <U> U reduce(Fun<Map.Entry<K,V>, ? extends U> transformer,
4578	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4579	<	return ForkJoinTasks.reduceEntries
4580	<	(map, transformer, reducer).invoke();
4581	<	}
4582	<
4583	<	/**
4584	<	* Returns the result of accumulating the given transformation
4585	<	* of all entries using the given reducer to combine values,
4586	<	* and the given basis as an identity value.
4587	<	*
4588	<	* @param transformer a function returning the transformation
4589	<	* for an element
4590	<	* @param basis the identity (initial default value) for the reduction
4591	<	* @param reducer a commutative associative combining function
4592	<	* @return the result of accumulating the given transformation
4593	<	* of all entries
4594	<	*/
4595	<	public double reduceToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4596	<	double basis,
4597	<	DoubleByDoubleToDouble reducer) {
4598	<	return ForkJoinTasks.reduceEntriesToDouble
4599	<	(map, transformer, basis, reducer).invoke();
4600	<	}
4601	<
4602	<	/**
4603	<	* Returns the result of accumulating the given transformation
4604	<	* of all entries using the given reducer to combine values,
4605	<	* and the given basis as an identity value.
4606	<	*
4607	<	* @param transformer a function returning the transformation
4608	<	* for an element
4609	<	* @param basis the identity (initial default value) for the reduction
4610	<	* @param reducer a commutative associative combining function
4611	<	* @return  the result of accumulating the given transformation
4612	<	* of all entries
4613	<	*/
4614	<	public long reduceToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4615	<	long basis,
4616	<	LongByLongToLong reducer) {
4617	<	return ForkJoinTasks.reduceEntriesToLong
4618	<	(map, transformer, basis, reducer).invoke();
4619	<	}
4620	<
4621	<	/**
4622	<	* Returns the result of accumulating the given transformation
4623	<	* of all entries using the given reducer to combine values,
4624	<	* and the given basis as an identity value.
4625	<	*
4626	<	* @param transformer a function returning the transformation
4627	<	* for an element
4628	<	* @param basis the identity (initial default value) for the reduction
4629	<	* @param reducer a commutative associative combining function
4630	<	* @return the result of accumulating the given transformation
4631	<	* of all entries
4632	<	*/
4633	<	public int reduceToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4634	<	int basis,
4635	<	IntByIntToInt reducer) {
4636	<	return ForkJoinTasks.reduceEntriesToInt
4637	<	(map, transformer, basis, reducer).invoke();
4638	<	}
4639	<
4640	<	}
4641	<
4642	<	// ---------------------------------------------------------------------
4643	<
4644	<	/**
4645	<	* Predefined tasks for performing bulk parallel operations on
4646	<	* ConcurrentHashMapV8s. These tasks follow the forms and rules used
4647	<	* for bulk operations. Each method has the same name, but returns
4648	<	* a task rather than invoking it. These methods may be useful in
4649	<	* custom applications such as submitting a task without waiting
4650	<	* for completion, using a custom pool, or combining with other
4651	<	* tasks.
4652	<	*/
4653	<	public static class ForkJoinTasks {
4654	<	private ForkJoinTasks() {}
4655	<
4656	<	/**
4657	<	* Returns a task that when invoked, performs the given
4658	<	* action for each (key, value)
4659	<	*
4660	<	* @param map the map
4661	<	* @param action the action
4662	<	* @return the task
4663	<	*/
4664	<	public static <K,V> ForkJoinTask<Void> forEach
4665	<	(ConcurrentHashMapV8<K,V> map,
4666	<	BiAction<K,V> action) {
4667	<	if (action == null) throw new NullPointerException();
4668	<	return new ForEachMappingTask<K,V>(map, null, -1, null, action);
4669	<	}
4670	<
4671	<	/**
4672	<	* Returns a task that when invoked, performs the given
4673	<	* action for each non-null transformation of each (key, value)
4674	<	*
4675	<	* @param map the map
4676	<	* @param transformer a function returning the transformation
4677	<	* for an element, or null if there is no transformation (in
4678	<	* which case the action is not applied)
4679	<	* @param action the action
4680	<	* @return the task
4681	<	*/
4682	<	public static <K,V,U> ForkJoinTask<Void> forEach
4683	<	(ConcurrentHashMapV8<K,V> map,
4684	<	BiFun<? super K, ? super V, ? extends U> transformer,
4685	<	Action<U> action) {
4686	<	if (transformer == null || action == null)
4687	<	throw new NullPointerException();
4688	<	return new ForEachTransformedMappingTask<K,V,U>
4689	<	(map, null, -1, null, transformer, action);
4690	<	}
4691	<
4692	<	/**
4693	<	* Returns a task that when invoked, returns a non-null result
4694	<	* from applying the given search function on each (key,
4695	<	* value), or null if none. Upon success, further element
4696	<	* processing is suppressed and the results of any other
4697	<	* parallel invocations of the search function are ignored.
4698	<	*
4699	<	* @param map the map
4700	<	* @param searchFunction a function returning a non-null
4701	<	* result on success, else null
4702	<	* @return the task
4703	<	*/
4704	<	public static <K,V,U> ForkJoinTask<U> search
4705	<	(ConcurrentHashMapV8<K,V> map,
4706	<	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4707	<	if (searchFunction == null) throw new NullPointerException();
4708	<	return new SearchMappingsTask<K,V,U>
4709	<	(map, null, -1, null, searchFunction,
4710	<	new AtomicReference<U>());
4711	<	}
4712	<
4713	<	/**
4714	<	* Returns a task that when invoked, returns the result of
4715	<	* accumulating the given transformation of all (key, value) pairs
4716	<	* using the given reducer to combine values, or null if none.
4717	<	*
4718	<	* @param map the map
4719	<	* @param transformer a function returning the transformation
4720	<	* for an element, or null if there is no transformation (in
4721	<	* which case it is not combined).
4722	<	* @param reducer a commutative associative combining function
4723	<	* @return the task
4724	<	*/
4725	<	public static <K,V,U> ForkJoinTask<U> reduce
4726	<	(ConcurrentHashMapV8<K,V> map,
4727	<	BiFun<? super K, ? super V, ? extends U> transformer,
4728	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4729	<	if (transformer == null || reducer == null)
4730	<	throw new NullPointerException();
4731	<	return new MapReduceMappingsTask<K,V,U>
4732	<	(map, null, -1, null, transformer, reducer);
4733	<	}
4734	<
4735	<	/**
4736	<	* Returns a task that when invoked, returns the result of
4737	<	* accumulating the given transformation of all (key, value) pairs
4738	<	* using the given reducer to combine values, and the given
4739	<	* basis as an identity value.
4740	<	*
4741	<	* @param map the map
4742	<	* @param transformer a function returning the transformation
4743	<	* for an element
4744	<	* @param basis the identity (initial default value) for the reduction
4745	<	* @param reducer a commutative associative combining function
4746	<	* @return the task
4747	<	*/
4748	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4749	<	(ConcurrentHashMapV8<K,V> map,
4750	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
4751	<	double basis,
4752	<	DoubleByDoubleToDouble reducer) {
4753	<	if (transformer == null || reducer == null)
4754	<	throw new NullPointerException();
4755	<	return new MapReduceMappingsToDoubleTask<K,V>
4756	<	(map, null, -1, null, transformer, basis, reducer);
4757	<	}
4758	<
4759	<	/**
4760	<	* Returns a task that when invoked, returns the result of
4761	<	* accumulating the given transformation of all (key, value) pairs
4762	<	* using the given reducer to combine values, and the given
4763	<	* basis as an identity value.
4764	<	*
4765	<	* @param map the map
4766	<	* @param transformer a function returning the transformation
4767	<	* for an element
4768	<	* @param basis the identity (initial default value) for the reduction
4769	<	* @param reducer a commutative associative combining function
4770	<	* @return the task
4771	<	*/
4772	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4773	<	(ConcurrentHashMapV8<K,V> map,
4774	<	ObjectByObjectToLong<? super K, ? super V> transformer,
4775	<	long basis,
4776	<	LongByLongToLong reducer) {
4777	<	if (transformer == null || reducer == null)
4778	<	throw new NullPointerException();
4779	<	return new MapReduceMappingsToLongTask<K,V>
4780	<	(map, null, -1, null, transformer, basis, reducer);
4781	<	}
4782	<
4783	<	/**
4784	<	* Returns a task that when invoked, returns the result of
4785	<	* accumulating the given transformation of all (key, value) pairs
4786	<	* using the given reducer to combine values, and the given
4787	<	* basis as an identity value.
4788	<	*
4789	<	* @param transformer a function returning the transformation
4790	<	* for an element
4791	<	* @param basis the identity (initial default value) for the reduction
4792	<	* @param reducer a commutative associative combining function
4793	<	* @return the task
4794	<	*/
4795	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4796	<	(ConcurrentHashMapV8<K,V> map,
4797	<	ObjectByObjectToInt<? super K, ? super V> transformer,
4798	<	int basis,
4799	<	IntByIntToInt reducer) {
4800	<	if (transformer == null || reducer == null)
4801	<	throw new NullPointerException();
4802	<	return new MapReduceMappingsToIntTask<K,V>
4803	<	(map, null, -1, null, transformer, basis, reducer);
4804	<	}
4805	<
4806	<	/**
4807	<	* Returns a task that when invoked, performs the given action
4808	<	* for each key.
4809	<	*
4810	<	* @param map the map
4811	<	* @param action the action
4812	<	* @return the task
4813	<	*/
4814	<	public static <K,V> ForkJoinTask<Void> forEachKey
4815	<	(ConcurrentHashMapV8<K,V> map,
4816	<	Action<K> action) {
4817	<	if (action == null) throw new NullPointerException();
4818	<	return new ForEachKeyTask<K,V>(map, null, -1, null, action);
4819	<	}
4820	<
4821	<	/**
4822	<	* Returns a task that when invoked, performs the given action
4823	<	* for each non-null transformation of each key.
4824	<	*
4825	<	* @param map the map
4826	<	* @param transformer a function returning the transformation
4827	<	* for an element, or null if there is no transformation (in
4828	<	* which case the action is not applied)
4829	<	* @param action the action
4830	<	* @return the task
4831	<	*/
4832	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4833	<	(ConcurrentHashMapV8<K,V> map,
4834	<	Fun<? super K, ? extends U> transformer,
4835	<	Action<U> action) {
4836	<	if (transformer == null || action == null)
4837	<	throw new NullPointerException();
4838	<	return new ForEachTransformedKeyTask<K,V,U>
4839	<	(map, null, -1, null, transformer, action);
4840	<	}
4841	<
4842	<	/**
4843	<	* Returns a task that when invoked, returns a non-null result
4844	<	* from applying the given search function on each key, or
4845	<	* null if none.  Upon success, further element processing is
4846	<	* suppressed and the results of any other parallel
4847	<	* invocations of the search function are ignored.
4848	<	*
4849	<	* @param map the map
4850	<	* @param searchFunction a function returning a non-null
4851	<	* result on success, else null
4852	<	* @return the task
4853	<	*/
4854	<	public static <K,V,U> ForkJoinTask<U> searchKeys
4855	<	(ConcurrentHashMapV8<K,V> map,
4856	<	Fun<? super K, ? extends U> searchFunction) {
4857	<	if (searchFunction == null) throw new NullPointerException();
4858	<	return new SearchKeysTask<K,V,U>
4859	<	(map, null, -1, null, searchFunction,
4860	<	new AtomicReference<U>());
4861	<	}
4862	<
4863	<	/**
4864	<	* Returns a task that when invoked, returns the result of
4865	<	* accumulating all keys using the given reducer to combine
4866	<	* values, or null if none.
4867	<	*
4868	<	* @param map the map
4869	<	* @param reducer a commutative associative combining function
4870	<	* @return the task
4871	<	*/
4872	<	public static <K,V> ForkJoinTask<K> reduceKeys
4873	<	(ConcurrentHashMapV8<K,V> map,
4874	<	BiFun<? super K, ? super K, ? extends K> reducer) {
4875	<	if (reducer == null) throw new NullPointerException();
4876	<	return new ReduceKeysTask<K,V>
4877	<	(map, null, -1, null, reducer);
4878	<	}
4879	<
4880	<	/**
4881	<	* Returns a task that when invoked, returns the result of
4882	<	* accumulating the given transformation of all keys using the given
4883	<	* reducer to combine values, or null if none.
4884	<	*
4885	<	* @param map the map
4886	<	* @param transformer a function returning the transformation
4887	<	* for an element, or null if there is no transformation (in
4888	<	* which case it is not combined).
4889	<	* @param reducer a commutative associative combining function
4890	<	* @return the task
4891	<	*/
4892	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
4893	<	(ConcurrentHashMapV8<K,V> map,
4894	<	Fun<? super K, ? extends U> transformer,
4895	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4896	<	if (transformer == null || reducer == null)
4897	<	throw new NullPointerException();
4898	<	return new MapReduceKeysTask<K,V,U>
4899	<	(map, null, -1, null, transformer, reducer);
4900	<	}
4901	<
4902	<	/**
4903	<	* Returns a task that when invoked, returns the result of
4904	<	* accumulating the given transformation of all keys using the given
4905	<	* reducer to combine values, and the given basis as an
4906	<	* identity value.
4907	<	*
4908	<	* @param map the map
4909	<	* @param transformer a function returning the transformation
4910	<	* for an element
4911	<	* @param basis the identity (initial default value) for the reduction
4912	<	* @param reducer a commutative associative combining function
4913	<	* @return the task
4914	<	*/
4915	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4916	<	(ConcurrentHashMapV8<K,V> map,
4917	<	ObjectToDouble<? super K> transformer,
4918	<	double basis,
4919	<	DoubleByDoubleToDouble reducer) {
4920	<	if (transformer == null || reducer == null)
4921	<	throw new NullPointerException();
4922	<	return new MapReduceKeysToDoubleTask<K,V>
4923	<	(map, null, -1, null, transformer, basis, reducer);
4924	<	}
4925	<
4926	<	/**
4927	<	* Returns a task that when invoked, returns the result of
4928	<	* accumulating the given transformation of all keys using the given
4929	<	* reducer to combine values, and the given basis as an
4930	<	* identity value.
4931	<	*
4932	<	* @param map the map
4933	<	* @param transformer a function returning the transformation
4934	<	* for an element
4935	<	* @param basis the identity (initial default value) for the reduction
4936	<	* @param reducer a commutative associative combining function
4937	<	* @return the task
4938	<	*/
4939	<	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
4940	<	(ConcurrentHashMapV8<K,V> map,
4941	<	ObjectToLong<? super K> transformer,
4942	<	long basis,
4943	<	LongByLongToLong reducer) {
4944	<	if (transformer == null || reducer == null)
4945	<	throw new NullPointerException();
4946	<	return new MapReduceKeysToLongTask<K,V>
4947	<	(map, null, -1, null, transformer, basis, reducer);
4948	<	}
4949	<
4950	<	/**
4951	<	* Returns a task that when invoked, returns the result of
4952	<	* accumulating the given transformation of all keys using the given
4953	<	* reducer to combine values, and the given basis as an
4954	<	* identity value.
4955	<	*
4956	<	* @param map the map
4957	<	* @param transformer a function returning the transformation
4958	<	* for an element
4959	<	* @param basis the identity (initial default value) for the reduction
4960	<	* @param reducer a commutative associative combining function
4961	<	* @return the task
4962	<	*/
4963	<	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
4964	<	(ConcurrentHashMapV8<K,V> map,
4965	<	ObjectToInt<? super K> transformer,
4966	<	int basis,
4967	<	IntByIntToInt reducer) {
4968	<	if (transformer == null || reducer == null)
4969	<	throw new NullPointerException();
4970	<	return new MapReduceKeysToIntTask<K,V>
4971	<	(map, null, -1, null, transformer, basis, reducer);
4972	<	}
4973	<
4974	<	/**
4975	<	* Returns a task that when invoked, performs the given action
4976	<	* for each value.
4977	<	*
4978	<	* @param map the map
4979	<	* @param action the action
4980	<	*/
4981	<	public static <K,V> ForkJoinTask<Void> forEachValue
4982	<	(ConcurrentHashMapV8<K,V> map,
4983	<	Action<V> action) {
4984	<	if (action == null) throw new NullPointerException();
4985	<	return new ForEachValueTask<K,V>(map, null, -1, null, action);
4986	<	}
4987	<
4988	<	/**
4989	<	* Returns a task that when invoked, performs the given action
4990	<	* for each non-null transformation of each value.
4991	<	*
4992	<	* @param map the map
4993	<	* @param transformer a function returning the transformation
4994	<	* for an element, or null if there is no transformation (in
4995	<	* which case the action is not applied)
4996	<	* @param action the action
4997	<	*/
4998	<	public static <K,V,U> ForkJoinTask<Void> forEachValue
4999	<	(ConcurrentHashMapV8<K,V> map,
5000	<	Fun<? super V, ? extends U> transformer,
5001	<	Action<U> action) {
5002	<	if (transformer == null || action == null)
5003	<	throw new NullPointerException();
5004	<	return new ForEachTransformedValueTask<K,V,U>
5005	<	(map, null, -1, null, transformer, action);
5006	<	}
5007	<
5008	<	/**
5009	<	* Returns a task that when invoked, returns a non-null result
5010	<	* from applying the given search function on each value, or
5011	<	* null if none.  Upon success, further element processing is
5012	<	* suppressed and the results of any other parallel
5013	<	* invocations of the search function are ignored.
5014	<	*
5015	<	* @param map the map
5016	<	* @param searchFunction a function returning a non-null
5017	<	* result on success, else null
5018	<	* @return the task
5019	<	*/
5020	<	public static <K,V,U> ForkJoinTask<U> searchValues
5021	<	(ConcurrentHashMapV8<K,V> map,
5022	<	Fun<? super V, ? extends U> searchFunction) {
5023	<	if (searchFunction == null) throw new NullPointerException();
5024	<	return new SearchValuesTask<K,V,U>
5025	<	(map, null, -1, null, searchFunction,
5026	<	new AtomicReference<U>());
5027	<	}
5028	<
5029	<	/**
5030	<	* Returns a task that when invoked, returns the result of
5031	<	* accumulating all values using the given reducer to combine
5032	<	* values, or null if none.
5033	<	*
5034	<	* @param map the map
5035	<	* @param reducer a commutative associative combining function
5036	<	* @return the task
5037	<	*/
5038	<	public static <K,V> ForkJoinTask<V> reduceValues
5039	<	(ConcurrentHashMapV8<K,V> map,
5040	<	BiFun<? super V, ? super V, ? extends V> reducer) {
5041	<	if (reducer == null) throw new NullPointerException();
5042	<	return new ReduceValuesTask<K,V>
5043	<	(map, null, -1, null, reducer);
5044	<	}
5045	<
5046	<	/**
5047	<	* Returns a task that when invoked, returns the result of
5048	<	* accumulating the given transformation of all values using the
5049	<	* given reducer to combine values, or null if none.
5050	<	*
5051	<	* @param map the map
5052	<	* @param transformer a function returning the transformation
5053	<	* for an element, or null if there is no transformation (in
5054	<	* which case it is not combined).
5055	<	* @param reducer a commutative associative combining function
5056	<	* @return the task
5057	<	*/
5058	<	public static <K,V,U> ForkJoinTask<U> reduceValues
5059	<	(ConcurrentHashMapV8<K,V> map,
5060	<	Fun<? super V, ? extends U> transformer,
5061	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5062	<	if (transformer == null || reducer == null)
5063	<	throw new NullPointerException();
5064	<	return new MapReduceValuesTask<K,V,U>
5065	<	(map, null, -1, null, transformer, reducer);
5066	<	}
5067	<
5068	<	/**
5069	<	* Returns a task that when invoked, returns the result of
5070	<	* accumulating the given transformation of all values using the
5071	<	* given reducer to combine values, and the given basis as an
5072	<	* identity value.
5073	<	*
5074	<	* @param map the map
5075	<	* @param transformer a function returning the transformation
5076	<	* for an element
5077	<	* @param basis the identity (initial default value) for the reduction
5078	<	* @param reducer a commutative associative combining function
5079	<	* @return the task
5080	<	*/
5081	<	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
5082	<	(ConcurrentHashMapV8<K,V> map,
5083	<	ObjectToDouble<? super V> transformer,
5084	<	double basis,
5085	<	DoubleByDoubleToDouble reducer) {
5086	<	if (transformer == null || reducer == null)
5087	<	throw new NullPointerException();
5088	<	return new MapReduceValuesToDoubleTask<K,V>
5089	<	(map, null, -1, null, transformer, basis, reducer);
5090	<	}
5091	<
5092	<	/**
5093	<	* Returns a task that when invoked, returns the result of
5094	<	* accumulating the given transformation of all values using the
5095	<	* given reducer to combine values, and the given basis as an
5096	<	* identity value.
5097	<	*
5098	<	* @param map the map
5099	<	* @param transformer a function returning the transformation
5100	<	* for an element
5101	<	* @param basis the identity (initial default value) for the reduction
5102	<	* @param reducer a commutative associative combining function
5103	<	* @return the task
5104	<	*/
5105	<	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
5106	<	(ConcurrentHashMapV8<K,V> map,
5107	<	ObjectToLong<? super V> transformer,
5108	<	long basis,
5109	<	LongByLongToLong reducer) {
5110	<	if (transformer == null || reducer == null)
5111	<	throw new NullPointerException();
5112	<	return new MapReduceValuesToLongTask<K,V>
5113	<	(map, null, -1, null, transformer, basis, reducer);
5114	<	}
5115	<
5116	<	/**
5117	<	* Returns a task that when invoked, returns the result of
5118	<	* accumulating the given transformation of all values using the
5119	<	* given reducer to combine values, and the given basis as an
5120	<	* identity value.
5121	<	*
5122	<	* @param map the map
5123	<	* @param transformer a function returning the transformation
5124	<	* for an element
5125	<	* @param basis the identity (initial default value) for the reduction
5126	<	* @param reducer a commutative associative combining function
5127	<	* @return the task
5128	<	*/
5129	<	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
5130	<	(ConcurrentHashMapV8<K,V> map,
5131	<	ObjectToInt<? super V> transformer,
5132	<	int basis,
5133	<	IntByIntToInt reducer) {
5134	<	if (transformer == null || reducer == null)
5135	<	throw new NullPointerException();
5136	<	return new MapReduceValuesToIntTask<K,V>
5137	<	(map, null, -1, null, transformer, basis, reducer);
4522	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> spliterator() {
4523	>	Node<K,V>[] t;
4524	>	ConcurrentHashMapV8<K,V> m = map;
4525	>	long n = m.sumCount();
4526	>	int f = (t = m.table) == null ? 0 : t.length;
4527	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4528		}
4529
4530	<	/**
5141	<	* Returns a task that when invoked, perform the given action
5142	<	* for each entry.
5143	<	*
5144	<	* @param map the map
5145	<	* @param action the action
5146	<	*/
5147	<	public static <K,V> ForkJoinTask<Void> forEachEntry
5148	<	(ConcurrentHashMapV8<K,V> map,
5149	<	Action<Map.Entry<K,V>> action) {
4530	>	public void forEach(Action<? super Map.Entry<K,V>> action) {
4531		if (action == null) throw new NullPointerException();
4532	<	return new ForEachEntryTask<K,V>(map, null, -1, null, action);
4533	<	}
4534	<
4535	<	/**
4536	<	* Returns a task that when invoked, perform the given action
4537	<	* for each non-null transformation of each entry.
5157	<	*
5158	<	* @param map the map
5159	<	* @param transformer a function returning the transformation
5160	<	* for an element, or null if there is no transformation (in
5161	<	* which case the action is not applied)
5162	<	* @param action the action
5163	<	*/
5164	<	public static <K,V,U> ForkJoinTask<Void> forEachEntry
5165	<	(ConcurrentHashMapV8<K,V> map,
5166	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5167	<	Action<U> action) {
5168	<	if (transformer == null || action == null)
5169	<	throw new NullPointerException();
5170	<	return new ForEachTransformedEntryTask<K,V,U>
5171	<	(map, null, -1, null, transformer, action);
5172	<	}
5173	<
5174	<	/**
5175	<	* Returns a task that when invoked, returns a non-null result
5176	<	* from applying the given search function on each entry, or
5177	<	* null if none.  Upon success, further element processing is
5178	<	* suppressed and the results of any other parallel
5179	<	* invocations of the search function are ignored.
5180	<	*
5181	<	* @param map the map
5182	<	* @param searchFunction a function returning a non-null
5183	<	* result on success, else null
5184	<	* @return the task
5185	<	*/
5186	<	public static <K,V,U> ForkJoinTask<U> searchEntries
5187	<	(ConcurrentHashMapV8<K,V> map,
5188	<	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
5189	<	if (searchFunction == null) throw new NullPointerException();
5190	<	return new SearchEntriesTask<K,V,U>
5191	<	(map, null, -1, null, searchFunction,
5192	<	new AtomicReference<U>());
5193	<	}
5194	<
5195	<	/**
5196	<	* Returns a task that when invoked, returns the result of
5197	<	* accumulating all entries using the given reducer to combine
5198	<	* values, or null if none.
5199	<	*
5200	<	* @param map the map
5201	<	* @param reducer a commutative associative combining function
5202	<	* @return the task
5203	<	*/
5204	<	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
5205	<	(ConcurrentHashMapV8<K,V> map,
5206	<	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5207	<	if (reducer == null) throw new NullPointerException();
5208	<	return new ReduceEntriesTask<K,V>
5209	<	(map, null, -1, null, reducer);
5210	<	}
5211	<
5212	<	/**
5213	<	* Returns a task that when invoked, returns the result of
5214	<	* accumulating the given transformation of all entries using the
5215	<	* given reducer to combine values, or null if none.
5216	<	*
5217	<	* @param map the map
5218	<	* @param transformer a function returning the transformation
5219	<	* for an element, or null if there is no transformation (in
5220	<	* which case it is not combined).
5221	<	* @param reducer a commutative associative combining function
5222	<	* @return the task
5223	<	*/
5224	<	public static <K,V,U> ForkJoinTask<U> reduceEntries
5225	<	(ConcurrentHashMapV8<K,V> map,
5226	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5227	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5228	<	if (transformer == null || reducer == null)
5229	<	throw new NullPointerException();
5230	<	return new MapReduceEntriesTask<K,V,U>
5231	<	(map, null, -1, null, transformer, reducer);
5232	<	}
5233	<
5234	<	/**
5235	<	* Returns a task that when invoked, returns the result of
5236	<	* accumulating the given transformation of all entries using the
5237	<	* given reducer to combine values, and the given basis as an
5238	<	* identity value.
5239	<	*
5240	<	* @param map the map
5241	<	* @param transformer a function returning the transformation
5242	<	* for an element
5243	<	* @param basis the identity (initial default value) for the reduction
5244	<	* @param reducer a commutative associative combining function
5245	<	* @return the task
5246	<	*/
5247	<	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
5248	<	(ConcurrentHashMapV8<K,V> map,
5249	<	ObjectToDouble<Map.Entry<K,V>> transformer,
5250	<	double basis,
5251	<	DoubleByDoubleToDouble reducer) {
5252	<	if (transformer == null || reducer == null)
5253	<	throw new NullPointerException();
5254	<	return new MapReduceEntriesToDoubleTask<K,V>
5255	<	(map, null, -1, null, transformer, basis, reducer);
5256	<	}
5257	<
5258	<	/**
5259	<	* Returns a task that when invoked, returns the result of
5260	<	* accumulating the given transformation of all entries using the
5261	<	* given reducer to combine values, and the given basis as an
5262	<	* identity value.
5263	<	*
5264	<	* @param map the map
5265	<	* @param transformer a function returning the transformation
5266	<	* for an element
5267	<	* @param basis the identity (initial default value) for the reduction
5268	<	* @param reducer a commutative associative combining function
5269	<	* @return the task
5270	<	*/
5271	<	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
5272	<	(ConcurrentHashMapV8<K,V> map,
5273	<	ObjectToLong<Map.Entry<K,V>> transformer,
5274	<	long basis,
5275	<	LongByLongToLong reducer) {
5276	<	if (transformer == null || reducer == null)
5277	<	throw new NullPointerException();
5278	<	return new MapReduceEntriesToLongTask<K,V>
5279	<	(map, null, -1, null, transformer, basis, reducer);
4532	>	Node<K,V>[] t;
4533	>	if ((t = map.table) != null) {
4534	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4535	>	for (Node<K,V> p; (p = it.advance()) != null; )
4536	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
4537	>	}
4538		}
4539
5282	–	/**
5283	–	* Returns a task that when invoked, returns the result of
5284	–	* accumulating the given transformation of all entries using the
5285	–	* given reducer to combine values, and the given basis as an
5286	–	* identity value.
5287	–	*
5288	–	* @param map the map
5289	–	* @param transformer a function returning the transformation
5290	–	* for an element
5291	–	* @param basis the identity (initial default value) for the reduction
5292	–	* @param reducer a commutative associative combining function
5293	–	* @return the task
5294	–	*/
5295	–	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
5296	–	(ConcurrentHashMapV8<K,V> map,
5297	–	ObjectToInt<Map.Entry<K,V>> transformer,
5298	–	int basis,
5299	–	IntByIntToInt reducer) {
5300	–	if (transformer == null || reducer == null)
5301	–	throw new NullPointerException();
5302	–	return new MapReduceEntriesToIntTask<K,V>
5303	–	(map, null, -1, null, transformer, basis, reducer);
5304	–	}
4540		}
4541
4542		// -------------------------------------------------------
4543
4544		/**
4545	<	* Base for FJ tasks for bulk operations. This adds a variant of
4546	<	* CountedCompleters and some split and merge bookkeeping to
5312	<	* iterator functionality. The forEach and reduce methods are
5313	<	* similar to those illustrated in CountedCompleter documentation,
5314	<	* except that bottom-up reduction completions perform them within
5315	<	* their compute methods. The search methods are like forEach
5316	<	* except they continually poll for success and exit early.  Also,
5317	<	* exceptions are handled in a simpler manner, by just trying to
5318	<	* complete root task exceptionally.
5319	<	*/
5320	<	@SuppressWarnings("serial") static abstract class BulkTask<K,V,R> extends Traverser<K,V,R> {
5321	<	final BulkTask<K,V,?> parent;  // completion target
5322	<	int batch;                     // split control; -1 for unknown
5323	<	int pending;                   // completion control
5324	<
5325	<	BulkTask(ConcurrentHashMapV8<K,V> map, BulkTask<K,V,?> parent,
5326	<	int batch) {
5327	<	super(map);
5328	<	this.parent = parent;
5329	<	this.batch = batch;
5330	<	if (parent != null && map != null) { // split parent
5331	<	Node[] t;
5332	<	if ((t = parent.tab) == null &&
5333	<	(t = parent.tab = map.table) != null)
5334	<	parent.baseLimit = parent.baseSize = t.length;
5335	<	this.tab = t;
5336	<	this.baseSize = parent.baseSize;
5337	<	int hi = this.baseLimit = parent.baseLimit;
5338	<	parent.baseLimit = this.index = this.baseIndex =
5339	<	(hi + parent.baseIndex + 1) >>> 1;
5340	<	}
5341	<	}
5342	<
5343	<	/**
5344	<	* Forces root task to complete.
5345	<	* @param ex if null, complete normally, else exceptionally
5346	<	* @return false to simplify use
5347	<	*/
5348	<	final boolean tryCompleteComputation(Throwable ex) {
5349	<	for (BulkTask<K,V,?> a = this;;) {
5350	<	BulkTask<K,V,?> p = a.parent;
5351	<	if (p == null) {
5352	<	if (ex != null)
5353	<	a.completeExceptionally(ex);
5354	<	else
5355	<	a.quietlyComplete();
5356	<	return false;
5357	<	}
5358	<	a = p;
5359	<	}
5360	<	}
5361	<
5362	<	/**
5363	<	* Version of tryCompleteComputation for function screening checks
5364	<	*/
5365	<	final boolean abortOnNullFunction() {
5366	<	return tryCompleteComputation(new Error("Unexpected null function"));
5367	<	}
5368	<
5369	<	// utilities
5370	<
5371	<	/** CompareAndSet pending count */
5372	<	final boolean casPending(int cmp, int val) {
5373	<	return U.compareAndSwapInt(this, PENDING, cmp, val);
5374	<	}
5375	<
5376	<	/**
5377	<	* Returns approx exp2 of the number of times (minus one) to
5378	<	* split task by two before executing leaf action. This value
5379	<	* is faster to compute and more convenient to use as a guide
5380	<	* to splitting than is the depth, since it is used while
5381	<	* dividing by two anyway.
5382	<	*/
5383	<	final int batch() {
5384	<	ConcurrentHashMapV8<K, V> m; int b; Node[] t;  ForkJoinPool pool;
5385	<	if ((b = batch) < 0 && (m = map) != null) { // force initialization
5386	<	if ((t = tab) == null && (t = tab = m.table) != null)
5387	<	baseLimit = baseSize = t.length;
5388	<	if (t != null) {
5389	<	long n = m.counter.sum();
5390	<	int par = ((pool = getPool()) == null) ?
5391	<	ForkJoinPool.getCommonPoolParallelism() :
5392	<	pool.getParallelism();
5393	<	int sp = par << 3; // slack of 8
5394	<	b = batch = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
5395	<	}
5396	<	}
5397	<	return b;
5398	<	}
5399	<
5400	<	/**
5401	<	* Returns exportable snapshot entry.
5402	<	*/
5403	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
5404	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
5405	<	}
5406	<
5407	<	// Unsafe mechanics
5408	<	private static final sun.misc.Unsafe U;
5409	<	private static final long PENDING;
5410	<	static {
5411	<	try {
5412	<	U = getUnsafe();
5413	<	PENDING = U.objectFieldOffset
5414	<	(BulkTask.class.getDeclaredField("pending"));
5415	<	} catch (Exception e) {
5416	<	throw new Error(e);
5417	<	}
5418	<	}
5419	<	}
5420	<
5421	<	/**
5422	<	* Base class for non-reductive actions
4545	>	* Base class for bulk tasks. Repeats some fields and code from
4546	>	* class Traverser, because we need to subclass CountedCompleter.
4547		*/
4548	<	@SuppressWarnings("serial") static abstract class BulkAction<K,V,R> extends BulkTask<K,V,R> {
4549	<	BulkAction<K,V,?> nextTask;
4550	<	BulkAction(ConcurrentHashMapV8<K,V> map, BulkTask<K,V,?> parent,
4551	<	int batch, BulkAction<K,V,?> nextTask) {
4552	<	super(map, parent, batch);
4553	<	this.nextTask = nextTask;
4548	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4549	>	Node<K,V>[] tab;        // same as Traverser
4550	>	Node<K,V> next;
4551	>	int index;
4552	>	int baseIndex;
4553	>	int baseLimit;
4554	>	final int baseSize;
4555	>	int batch;              // split control
4556	>
4557	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4558	>	super(par);
4559	>	this.batch = b;
4560	>	this.index = this.baseIndex = i;
4561	>	if ((this.tab = t) == null)
4562	>	this.baseSize = this.baseLimit = 0;
4563	>	else if (par == null)
4564	>	this.baseSize = this.baseLimit = t.length;
4565	>	else {
4566	>	this.baseLimit = f;
4567	>	this.baseSize = par.baseSize;
4568	>	}
4569		}
4570
4571		/**
4572	<	* Try to complete task and upward parents. Upon hitting
5434	<	* non-completed parent, if a non-FJ task, try to help out the
5435	<	* computation.
4572	>	* Same as Traverser version
4573		*/
4574	<	final void tryComplete(BulkAction<K,V,?> subtasks) {
4575	<	BulkTask<K,V,?> a = this, s = a;
4576	<	for (int c;;) {
4577	<	if ((c = a.pending) == 0) {
4578	<	if ((a = (s = a).parent) == null) {
4579	<	s.quietlyComplete();
4580	<	break;
4581	<	}
4582	<	}
4583	<	else if (a.casPending(c, c - 1)) {
4584	<	if (subtasks != null && !inForkJoinPool()) {
4585	<	while ((s = a.parent) != null)
4586	<	a = s;
4587	<	while (!a.isDone()) {
4588	<	BulkAction<K,V,?> next = subtasks.nextTask;
4589	<	if (subtasks.tryUnfork())
5453	<	subtasks.exec();
5454	<	if ((subtasks = next) == null)
5455	<	break;
5456	<	}
4574	>	final Node<K,V> advance() {
4575	>	Node<K,V> e;
4576	>	if ((e = next) != null)
4577	>	e = e.next;
4578	>	for (;;) {
4579	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4580	>	if (e != null)
4581	>	return next = e;
4582	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4583	>	(n = t.length) <= (i = index) || i < 0)
4584	>	return next = null;
4585	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4586	>	if (e instanceof ForwardingNode) {
4587	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4588	>	e = null;
4589	>	continue;
4590		}
4591	<	break;
4591	>	else if (e instanceof TreeBin)
4592	>	e = ((TreeBin<K,V>)e).first;
4593	>	else
4594	>	e = null;
4595		}
4596	+	if ((index += baseSize) >= n)
4597	+	index = ++baseIndex;    // visit upper slots if present
4598		}
4599		}
5462	–
4600		}
4601
4602		/*
4603		* Task classes. Coded in a regular but ugly format/style to
4604		* simplify checks that each variant differs in the right way from
4605	<	* others.
4606	<	*/
4607	<
4608	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4609	<	extends BulkAction<K,V,Void> {
4610	<	final Action<K> action;
4605	>	* others. The null screenings exist because compilers cannot tell
4606	>	* that we've already null-checked task arguments, so we force
4607	>	* simplest hoisted bypass to help avoid convoluted traps.
4608	>	*/
4609	>	@SuppressWarnings("serial")
4610	>	static final class ForEachKeyTask<K,V>
4611	>	extends BulkTask<K,V,Void> {
4612	>	final Action<? super K> action;
4613		ForEachKeyTask
4614	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4615	<	ForEachKeyTask<K,V> nextTask,
4616	<	Action<K> action) {
5478	<	super(m, p, b, nextTask);
4614	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4615	>	Action<? super K> action) {
4616	>	super(p, b, i, f, t);
4617		this.action = action;
4618		}
4619	<	@SuppressWarnings("unchecked") public final boolean exec() {
4620	<	final Action<K> action = this.action;
4621	<	if (action == null)
4622	<	return abortOnNullFunction();
4623	<	ForEachKeyTask<K,V> subtasks = null;
4624	<	try {
4625	<	int b = batch(), c;
4626	<	while (b > 1 && baseIndex != baseLimit) {
4627	<	do {} while (!casPending(c = pending, c+1));
4628	<	(subtasks = new ForEachKeyTask<K,V>
4629	<	(map, this, b >>>= 1, subtasks, action)).fork();
4630	<	}
4631	<	while (advance() != null)
5494	<	action.apply((K)nextKey);
5495	<	} catch (Throwable ex) {
5496	<	return tryCompleteComputation(ex);
4619	>	public final void compute() {
4620	>	final Action<? super K> action;
4621	>	if ((action = this.action) != null) {
4622	>	for (int i = baseIndex, f, h; batch > 0 &&
4623	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4624	>	addToPendingCount(1);
4625	>	new ForEachKeyTask<K,V>
4626	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4627	>	action).fork();
4628	>	}
4629	>	for (Node<K,V> p; (p = advance()) != null;)
4630	>	action.apply(p.key);
4631	>	propagateCompletion();
4632		}
5498	–	tryComplete(subtasks);
5499	–	return false;
4633		}
4634		}
4635
4636	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4637	<	extends BulkAction<K,V,Void> {
4638	<	final Action<V> action;
4636	>	@SuppressWarnings("serial")
4637	>	static final class ForEachValueTask<K,V>
4638	>	extends BulkTask<K,V,Void> {
4639	>	final Action<? super V> action;
4640		ForEachValueTask
4641	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4642	<	ForEachValueTask<K,V> nextTask,
4643	<	Action<V> action) {
5510	<	super(m, p, b, nextTask);
4641	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4642	>	Action<? super V> action) {
4643	>	super(p, b, i, f, t);
4644		this.action = action;
4645		}
4646	<	@SuppressWarnings("unchecked") public final boolean exec() {
4647	<	final Action<V> action = this.action;
4648	<	if (action == null)
4649	<	return abortOnNullFunction();
4650	<	ForEachValueTask<K,V> subtasks = null;
4651	<	try {
4652	<	int b = batch(), c;
4653	<	while (b > 1 && baseIndex != baseLimit) {
4654	<	do {} while (!casPending(c = pending, c+1));
4655	<	(subtasks = new ForEachValueTask<K,V>
4656	<	(map, this, b >>>= 1, subtasks, action)).fork();
4657	<	}
4658	<	Object v;
5526	<	while ((v = advance()) != null)
5527	<	action.apply((V)v);
5528	<	} catch (Throwable ex) {
5529	<	return tryCompleteComputation(ex);
4646	>	public final void compute() {
4647	>	final Action<? super V> action;
4648	>	if ((action = this.action) != null) {
4649	>	for (int i = baseIndex, f, h; batch > 0 &&
4650	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4651	>	addToPendingCount(1);
4652	>	new ForEachValueTask<K,V>
4653	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4654	>	action).fork();
4655	>	}
4656	>	for (Node<K,V> p; (p = advance()) != null;)
4657	>	action.apply(p.val);
4658	>	propagateCompletion();
4659		}
5531	–	tryComplete(subtasks);
5532	–	return false;
4660		}
4661		}
4662
4663	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4664	<	extends BulkAction<K,V,Void> {
4665	<	final Action<Entry<K,V>> action;
4663	>	@SuppressWarnings("serial")
4664	>	static final class ForEachEntryTask<K,V>
4665	>	extends BulkTask<K,V,Void> {
4666	>	final Action<? super Entry<K,V>> action;
4667		ForEachEntryTask
4668	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4669	<	ForEachEntryTask<K,V> nextTask,
4670	<	Action<Entry<K,V>> action) {
5543	<	super(m, p, b, nextTask);
4668	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4669	>	Action<? super Entry<K,V>> action) {
4670	>	super(p, b, i, f, t);
4671		this.action = action;
4672		}
4673	<	@SuppressWarnings("unchecked") public final boolean exec() {
4674	<	final Action<Entry<K,V>> action = this.action;
4675	<	if (action == null)
4676	<	return abortOnNullFunction();
4677	<	ForEachEntryTask<K,V> subtasks = null;
4678	<	try {
4679	<	int b = batch(), c;
4680	<	while (b > 1 && baseIndex != baseLimit) {
4681	<	do {} while (!casPending(c = pending, c+1));
4682	<	(subtasks = new ForEachEntryTask<K,V>
4683	<	(map, this, b >>>= 1, subtasks, action)).fork();
4684	<	}
4685	<	Object v;
5559	<	while ((v = advance()) != null)
5560	<	action.apply(entryFor((K)nextKey, (V)v));
5561	<	} catch (Throwable ex) {
5562	<	return tryCompleteComputation(ex);
4673	>	public final void compute() {
4674	>	final Action<? super Entry<K,V>> action;
4675	>	if ((action = this.action) != null) {
4676	>	for (int i = baseIndex, f, h; batch > 0 &&
4677	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4678	>	addToPendingCount(1);
4679	>	new ForEachEntryTask<K,V>
4680	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4681	>	action).fork();
4682	>	}
4683	>	for (Node<K,V> p; (p = advance()) != null; )
4684	>	action.apply(p);
4685	>	propagateCompletion();
4686		}
5564	–	tryComplete(subtasks);
5565	–	return false;
4687		}
4688		}
4689
4690	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4691	<	extends BulkAction<K,V,Void> {
4692	<	final BiAction<K,V> action;
4690	>	@SuppressWarnings("serial")
4691	>	static final class ForEachMappingTask<K,V>
4692	>	extends BulkTask<K,V,Void> {
4693	>	final BiAction<? super K, ? super V> action;
4694		ForEachMappingTask
4695	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4696	<	ForEachMappingTask<K,V> nextTask,
4697	<	BiAction<K,V> action) {
5576	<	super(m, p, b, nextTask);
4695	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4696	>	BiAction<? super K,? super V> action) {
4697	>	super(p, b, i, f, t);
4698		this.action = action;
4699		}
4700	<	@SuppressWarnings("unchecked") public final boolean exec() {
4701	<	final BiAction<K,V> action = this.action;
4702	<	if (action == null)
4703	<	return abortOnNullFunction();
4704	<	ForEachMappingTask<K,V> subtasks = null;
4705	<	try {
4706	<	int b = batch(), c;
4707	<	while (b > 1 && baseIndex != baseLimit) {
4708	<	do {} while (!casPending(c = pending, c+1));
4709	<	(subtasks = new ForEachMappingTask<K,V>
4710	<	(map, this, b >>>= 1, subtasks, action)).fork();
4711	<	}
4712	<	Object v;
5592	<	while ((v = advance()) != null)
5593	<	action.apply((K)nextKey, (V)v);
5594	<	} catch (Throwable ex) {
5595	<	return tryCompleteComputation(ex);
4700	>	public final void compute() {
4701	>	final BiAction<? super K, ? super V> action;
4702	>	if ((action = this.action) != null) {
4703	>	for (int i = baseIndex, f, h; batch > 0 &&
4704	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4705	>	addToPendingCount(1);
4706	>	new ForEachMappingTask<K,V>
4707	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4708	>	action).fork();
4709	>	}
4710	>	for (Node<K,V> p; (p = advance()) != null; )
4711	>	action.apply(p.key, p.val);
4712	>	propagateCompletion();
4713		}
5597	–	tryComplete(subtasks);
5598	–	return false;
4714		}
4715		}
4716
4717	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4718	<	extends BulkAction<K,V,Void> {
4717	>	@SuppressWarnings("serial")
4718	>	static final class ForEachTransformedKeyTask<K,V,U>
4719	>	extends BulkTask<K,V,Void> {
4720		final Fun<? super K, ? extends U> transformer;
4721	<	final Action<U> action;
4721	>	final Action<? super U> action;
4722		ForEachTransformedKeyTask
4723	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4724	<	ForEachTransformedKeyTask<K,V,U> nextTask,
4725	<	Fun<? super K, ? extends U> transformer,
4726	<	Action<U> action) {
4727	<	super(m, p, b, nextTask);
4728	<	this.transformer = transformer;
4729	<	this.action = action;
4730	<
4731	<	}
4732	<	@SuppressWarnings("unchecked") public final boolean exec() {
4733	<	final Fun<? super K, ? extends U> transformer =
4734	<	this.transformer;
4735	<	final Action<U> action = this.action;
4736	<	if (transformer == null || action == null)
4737	<	return abortOnNullFunction();
4738	<	ForEachTransformedKeyTask<K,V,U> subtasks = null;
4739	<	try {
4740	<	int b = batch(), c;
4741	<	while (b > 1 && baseIndex != baseLimit) {
4742	<	do {} while (!casPending(c = pending, c+1));
5627	<	(subtasks = new ForEachTransformedKeyTask<K,V,U>
5628	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5629	<	}
5630	<	U u;
5631	<	while (advance() != null) {
5632	<	if ((u = transformer.apply((K)nextKey)) != null)
4723	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4724	>	Fun<? super K, ? extends U> transformer, Action<? super U> action) {
4725	>	super(p, b, i, f, t);
4726	>	this.transformer = transformer; this.action = action;
4727	>	}
4728	>	public final void compute() {
4729	>	final Fun<? super K, ? extends U> transformer;
4730	>	final Action<? super U> action;
4731	>	if ((transformer = this.transformer) != null &&
4732	>	(action = this.action) != null) {
4733	>	for (int i = baseIndex, f, h; batch > 0 &&
4734	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4735	>	addToPendingCount(1);
4736	>	new ForEachTransformedKeyTask<K,V,U>
4737	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4738	>	transformer, action).fork();
4739	>	}
4740	>	for (Node<K,V> p; (p = advance()) != null; ) {
4741	>	U u;
4742	>	if ((u = transformer.apply(p.key)) != null)
4743		action.apply(u);
4744		}
4745	<	} catch (Throwable ex) {
5636	<	return tryCompleteComputation(ex);
4745	>	propagateCompletion();
4746		}
5638	–	tryComplete(subtasks);
5639	–	return false;
4747		}
4748		}
4749
4750	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4751	<	extends BulkAction<K,V,Void> {
4750	>	@SuppressWarnings("serial")
4751	>	static final class ForEachTransformedValueTask<K,V,U>
4752	>	extends BulkTask<K,V,Void> {
4753		final Fun<? super V, ? extends U> transformer;
4754	<	final Action<U> action;
4754	>	final Action<? super U> action;
4755		ForEachTransformedValueTask
4756	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4757	<	ForEachTransformedValueTask<K,V,U> nextTask,
4758	<	Fun<? super V, ? extends U> transformer,
4759	<	Action<U> action) {
4760	<	super(m, p, b, nextTask);
4761	<	this.transformer = transformer;
4762	<	this.action = action;
4763	<
4764	<	}
4765	<	@SuppressWarnings("unchecked") public final boolean exec() {
4766	<	final Fun<? super V, ? extends U> transformer =
4767	<	this.transformer;
4768	<	final Action<U> action = this.action;
4769	<	if (transformer == null || action == null)
4770	<	return abortOnNullFunction();
4771	<	ForEachTransformedValueTask<K,V,U> subtasks = null;
4772	<	try {
4773	<	int b = batch(), c;
4774	<	while (b > 1 && baseIndex != baseLimit) {
4775	<	do {} while (!casPending(c = pending, c+1));
5668	<	(subtasks = new ForEachTransformedValueTask<K,V,U>
5669	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5670	<	}
5671	<	Object v; U u;
5672	<	while ((v = advance()) != null) {
5673	<	if ((u = transformer.apply((V)v)) != null)
4756	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4757	>	Fun<? super V, ? extends U> transformer, Action<? super U> action) {
4758	>	super(p, b, i, f, t);
4759	>	this.transformer = transformer; this.action = action;
4760	>	}
4761	>	public final void compute() {
4762	>	final Fun<? super V, ? extends U> transformer;
4763	>	final Action<? super U> action;
4764	>	if ((transformer = this.transformer) != null &&
4765	>	(action = this.action) != null) {
4766	>	for (int i = baseIndex, f, h; batch > 0 &&
4767	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4768	>	addToPendingCount(1);
4769	>	new ForEachTransformedValueTask<K,V,U>
4770	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4771	>	transformer, action).fork();
4772	>	}
4773	>	for (Node<K,V> p; (p = advance()) != null; ) {
4774	>	U u;
4775	>	if ((u = transformer.apply(p.val)) != null)
4776		action.apply(u);
4777		}
4778	<	} catch (Throwable ex) {
5677	<	return tryCompleteComputation(ex);
4778	>	propagateCompletion();
4779		}
5679	–	tryComplete(subtasks);
5680	–	return false;
4780		}
4781		}
4782
4783	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4784	<	extends BulkAction<K,V,Void> {
4783	>	@SuppressWarnings("serial")
4784	>	static final class ForEachTransformedEntryTask<K,V,U>
4785	>	extends BulkTask<K,V,Void> {
4786		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4787	<	final Action<U> action;
4787	>	final Action<? super U> action;
4788		ForEachTransformedEntryTask
4789	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4790	<	ForEachTransformedEntryTask<K,V,U> nextTask,
4791	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4792	<	Action<U> action) {
4793	<	super(m, p, b, nextTask);
4794	<	this.transformer = transformer;
4795	<	this.action = action;
4796	<
4797	<	}
4798	<	@SuppressWarnings("unchecked") public final boolean exec() {
4799	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
4800	<	this.transformer;
4801	<	final Action<U> action = this.action;
4802	<	if (transformer == null || action == null)
4803	<	return abortOnNullFunction();
4804	<	ForEachTransformedEntryTask<K,V,U> subtasks = null;
4805	<	try {
4806	<	int b = batch(), c;
4807	<	while (b > 1 && baseIndex != baseLimit) {
4808	<	do {} while (!casPending(c = pending, c+1));
5709	<	(subtasks = new ForEachTransformedEntryTask<K,V,U>
5710	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5711	<	}
5712	<	Object v; U u;
5713	<	while ((v = advance()) != null) {
5714	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
4789	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4790	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<? super U> action) {
4791	>	super(p, b, i, f, t);
4792	>	this.transformer = transformer; this.action = action;
4793	>	}
4794	>	public final void compute() {
4795	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
4796	>	final Action<? super U> action;
4797	>	if ((transformer = this.transformer) != null &&
4798	>	(action = this.action) != null) {
4799	>	for (int i = baseIndex, f, h; batch > 0 &&
4800	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4801	>	addToPendingCount(1);
4802	>	new ForEachTransformedEntryTask<K,V,U>
4803	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4804	>	transformer, action).fork();
4805	>	}
4806	>	for (Node<K,V> p; (p = advance()) != null; ) {
4807	>	U u;
4808	>	if ((u = transformer.apply(p)) != null)
4809		action.apply(u);
4810		}
4811	<	} catch (Throwable ex) {
5718	<	return tryCompleteComputation(ex);
4811	>	propagateCompletion();
4812		}
5720	–	tryComplete(subtasks);
5721	–	return false;
4813		}
4814		}
4815
4816	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4817	<	extends BulkAction<K,V,Void> {
4816	>	@SuppressWarnings("serial")
4817	>	static final class ForEachTransformedMappingTask<K,V,U>
4818	>	extends BulkTask<K,V,Void> {
4819		final BiFun<? super K, ? super V, ? extends U> transformer;
4820	<	final Action<U> action;
4820	>	final Action<? super U> action;
4821		ForEachTransformedMappingTask
4822	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5731	<	ForEachTransformedMappingTask<K,V,U> nextTask,
4822	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4823		BiFun<? super K, ? super V, ? extends U> transformer,
4824	<	Action<U> action) {
4825	<	super(m, p, b, nextTask);
4826	<	this.transformer = transformer;
4827	<	this.action = action;
4828	<
4829	<	}
4830	<	@SuppressWarnings("unchecked") public final boolean exec() {
4831	<	final BiFun<? super K, ? super V, ? extends U> transformer =
4832	<	this.transformer;
4833	<	final Action<U> action = this.action;
4834	<	if (transformer == null || action == null)
4835	<	return abortOnNullFunction();
4836	<	ForEachTransformedMappingTask<K,V,U> subtasks = null;
4837	<	try {
4838	<	int b = batch(), c;
4839	<	while (b > 1 && baseIndex != baseLimit) {
4840	<	do {} while (!casPending(c = pending, c+1));
4841	<	(subtasks = new ForEachTransformedMappingTask<K,V,U>
4842	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5752	<	}
5753	<	Object v; U u;
5754	<	while ((v = advance()) != null) {
5755	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
4824	>	Action<? super U> action) {
4825	>	super(p, b, i, f, t);
4826	>	this.transformer = transformer; this.action = action;
4827	>	}
4828	>	public final void compute() {
4829	>	final BiFun<? super K, ? super V, ? extends U> transformer;
4830	>	final Action<? super U> action;
4831	>	if ((transformer = this.transformer) != null &&
4832	>	(action = this.action) != null) {
4833	>	for (int i = baseIndex, f, h; batch > 0 &&
4834	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4835	>	addToPendingCount(1);
4836	>	new ForEachTransformedMappingTask<K,V,U>
4837	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4838	>	transformer, action).fork();
4839	>	}
4840	>	for (Node<K,V> p; (p = advance()) != null; ) {
4841	>	U u;
4842	>	if ((u = transformer.apply(p.key, p.val)) != null)
4843		action.apply(u);
4844		}
4845	<	} catch (Throwable ex) {
5759	<	return tryCompleteComputation(ex);
4845	>	propagateCompletion();
4846		}
5761	–	tryComplete(subtasks);
5762	–	return false;
4847		}
4848		}
4849
4850	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4851	<	extends BulkAction<K,V,U> {
4850	>	@SuppressWarnings("serial")
4851	>	static final class SearchKeysTask<K,V,U>
4852	>	extends BulkTask<K,V,U> {
4853		final Fun<? super K, ? extends U> searchFunction;
4854		final AtomicReference<U> result;
4855		SearchKeysTask
4856	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5772	<	SearchKeysTask<K,V,U> nextTask,
4856	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4857		Fun<? super K, ? extends U> searchFunction,
4858		AtomicReference<U> result) {
4859	<	super(m, p, b, nextTask);
4859	>	super(p, b, i, f, t);
4860		this.searchFunction = searchFunction; this.result = result;
4861		}
4862	<	@SuppressWarnings("unchecked") public final boolean exec() {
4863	<	AtomicReference<U> result = this.result;
4864	<	final Fun<? super K, ? extends U> searchFunction =
4865	<	this.searchFunction;
4866	<	if (searchFunction == null || result == null)
4867	<	return abortOnNullFunction();
4868	<	SearchKeysTask<K,V,U> subtasks = null;
4869	<	try {
4870	<	int b = batch(), c;
4871	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
4872	<	do {} while (!casPending(c = pending, c+1));
4873	<	(subtasks = new SearchKeysTask<K,V,U>
4874	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
4875	<	}
4876	<	U u;
4877	<	while (result.get() == null && advance() != null) {
4878	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
4862	>	public final U getRawResult() { return result.get(); }
4863	>	public final void compute() {
4864	>	final Fun<? super K, ? extends U> searchFunction;
4865	>	final AtomicReference<U> result;
4866	>	if ((searchFunction = this.searchFunction) != null &&
4867	>	(result = this.result) != null) {
4868	>	for (int i = baseIndex, f, h; batch > 0 &&
4869	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4870	>	if (result.get() != null)
4871	>	return;
4872	>	addToPendingCount(1);
4873	>	new SearchKeysTask<K,V,U>
4874	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4875	>	searchFunction, result).fork();
4876	>	}
4877	>	while (result.get() == null) {
4878	>	U u;
4879	>	Node<K,V> p;
4880	>	if ((p = advance()) == null) {
4881	>	propagateCompletion();
4882	>	break;
4883	>	}
4884	>	if ((u = searchFunction.apply(p.key)) != null) {
4885		if (result.compareAndSet(null, u))
4886	<	tryCompleteComputation(null);
4886	>	quietlyCompleteRoot();
4887		break;
4888		}
4889		}
5800	–	} catch (Throwable ex) {
5801	–	return tryCompleteComputation(ex);
4890		}
5803	–	tryComplete(subtasks);
5804	–	return false;
4891		}
5806	–	public final U getRawResult() { return result.get(); }
4892		}
4893
4894	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
4895	<	extends BulkAction<K,V,U> {
4894	>	@SuppressWarnings("serial")
4895	>	static final class SearchValuesTask<K,V,U>
4896	>	extends BulkTask<K,V,U> {
4897		final Fun<? super V, ? extends U> searchFunction;
4898		final AtomicReference<U> result;
4899		SearchValuesTask
4900	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5815	<	SearchValuesTask<K,V,U> nextTask,
4900	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4901		Fun<? super V, ? extends U> searchFunction,
4902		AtomicReference<U> result) {
4903	<	super(m, p, b, nextTask);
4903	>	super(p, b, i, f, t);
4904		this.searchFunction = searchFunction; this.result = result;
4905		}
4906	<	@SuppressWarnings("unchecked") public final boolean exec() {
4907	<	AtomicReference<U> result = this.result;
4908	<	final Fun<? super V, ? extends U> searchFunction =
4909	<	this.searchFunction;
4910	<	if (searchFunction == null || result == null)
4911	<	return abortOnNullFunction();
4912	<	SearchValuesTask<K,V,U> subtasks = null;
4913	<	try {
4914	<	int b = batch(), c;
4915	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
4916	<	do {} while (!casPending(c = pending, c+1));
4917	<	(subtasks = new SearchValuesTask<K,V,U>
4918	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
4919	<	}
4920	<	Object v; U u;
4921	<	while (result.get() == null && (v = advance()) != null) {
4922	<	if ((u = searchFunction.apply((V)v)) != null) {
4906	>	public final U getRawResult() { return result.get(); }
4907	>	public final void compute() {
4908	>	final Fun<? super V, ? extends U> searchFunction;
4909	>	final AtomicReference<U> result;
4910	>	if ((searchFunction = this.searchFunction) != null &&
4911	>	(result = this.result) != null) {
4912	>	for (int i = baseIndex, f, h; batch > 0 &&
4913	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4914	>	if (result.get() != null)
4915	>	return;
4916	>	addToPendingCount(1);
4917	>	new SearchValuesTask<K,V,U>
4918	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4919	>	searchFunction, result).fork();
4920	>	}
4921	>	while (result.get() == null) {
4922	>	U u;
4923	>	Node<K,V> p;
4924	>	if ((p = advance()) == null) {
4925	>	propagateCompletion();
4926	>	break;
4927	>	}
4928	>	if ((u = searchFunction.apply(p.val)) != null) {
4929		if (result.compareAndSet(null, u))
4930	<	tryCompleteComputation(null);
4930	>	quietlyCompleteRoot();
4931		break;
4932		}
4933		}
5843	–	} catch (Throwable ex) {
5844	–	return tryCompleteComputation(ex);
4934		}
5846	–	tryComplete(subtasks);
5847	–	return false;
4935		}
5849	–	public final U getRawResult() { return result.get(); }
4936		}
4937
4938	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
4939	<	extends BulkAction<K,V,U> {
4938	>	@SuppressWarnings("serial")
4939	>	static final class SearchEntriesTask<K,V,U>
4940	>	extends BulkTask<K,V,U> {
4941		final Fun<Entry<K,V>, ? extends U> searchFunction;
4942		final AtomicReference<U> result;
4943		SearchEntriesTask
4944	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5858	<	SearchEntriesTask<K,V,U> nextTask,
4944	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4945		Fun<Entry<K,V>, ? extends U> searchFunction,
4946		AtomicReference<U> result) {
4947	<	super(m, p, b, nextTask);
4947	>	super(p, b, i, f, t);
4948		this.searchFunction = searchFunction; this.result = result;
4949		}
4950	<	@SuppressWarnings("unchecked") public final boolean exec() {
4951	<	AtomicReference<U> result = this.result;
4952	<	final Fun<Entry<K,V>, ? extends U> searchFunction =
4953	<	this.searchFunction;
4954	<	if (searchFunction == null || result == null)
4955	<	return abortOnNullFunction();
4956	<	SearchEntriesTask<K,V,U> subtasks = null;
4957	<	try {
4958	<	int b = batch(), c;
4959	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
4960	<	do {} while (!casPending(c = pending, c+1));
4961	<	(subtasks = new SearchEntriesTask<K,V,U>
4962	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
4963	<	}
4964	<	Object v; U u;
4965	<	while (result.get() == null && (v = advance()) != null) {
4966	<	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
4967	<	if (result.compareAndSet(null, u))
4968	<	tryCompleteComputation(null);
4950	>	public final U getRawResult() { return result.get(); }
4951	>	public final void compute() {
4952	>	final Fun<Entry<K,V>, ? extends U> searchFunction;
4953	>	final AtomicReference<U> result;
4954	>	if ((searchFunction = this.searchFunction) != null &&
4955	>	(result = this.result) != null) {
4956	>	for (int i = baseIndex, f, h; batch > 0 &&
4957	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4958	>	if (result.get() != null)
4959	>	return;
4960	>	addToPendingCount(1);
4961	>	new SearchEntriesTask<K,V,U>
4962	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4963	>	searchFunction, result).fork();
4964	>	}
4965	>	while (result.get() == null) {
4966	>	U u;
4967	>	Node<K,V> p;
4968	>	if ((p = advance()) == null) {
4969	>	propagateCompletion();
4970		break;
4971		}
4972	+	if ((u = searchFunction.apply(p)) != null) {
4973	+	if (result.compareAndSet(null, u))
4974	+	quietlyCompleteRoot();
4975	+	return;
4976	+	}
4977		}
5886	–	} catch (Throwable ex) {
5887	–	return tryCompleteComputation(ex);
4978		}
5889	–	tryComplete(subtasks);
5890	–	return false;
4979		}
5892	–	public final U getRawResult() { return result.get(); }
4980		}
4981
4982	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
4983	<	extends BulkAction<K,V,U> {
4982	>	@SuppressWarnings("serial")
4983	>	static final class SearchMappingsTask<K,V,U>
4984	>	extends BulkTask<K,V,U> {
4985		final BiFun<? super K, ? super V, ? extends U> searchFunction;
4986		final AtomicReference<U> result;
4987		SearchMappingsTask
4988	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5901	<	SearchMappingsTask<K,V,U> nextTask,
4988	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4989		BiFun<? super K, ? super V, ? extends U> searchFunction,
4990		AtomicReference<U> result) {
4991	<	super(m, p, b, nextTask);
4991	>	super(p, b, i, f, t);
4992		this.searchFunction = searchFunction; this.result = result;
4993		}
4994	<	@SuppressWarnings("unchecked") public final boolean exec() {
4995	<	AtomicReference<U> result = this.result;
4996	<	final BiFun<? super K, ? super V, ? extends U> searchFunction =
4997	<	this.searchFunction;
4998	<	if (searchFunction == null || result == null)
4999	<	return abortOnNullFunction();
5000	<	SearchMappingsTask<K,V,U> subtasks = null;
5001	<	try {
5002	<	int b = batch(), c;
5003	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5004	<	do {} while (!casPending(c = pending, c+1));
5005	<	(subtasks = new SearchMappingsTask<K,V,U>
5006	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5007	<	}
5008	<	Object v; U u;
5009	<	while (result.get() == null && (v = advance()) != null) {
5010	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
4994	>	public final U getRawResult() { return result.get(); }
4995	>	public final void compute() {
4996	>	final BiFun<? super K, ? super V, ? extends U> searchFunction;
4997	>	final AtomicReference<U> result;
4998	>	if ((searchFunction = this.searchFunction) != null &&
4999	>	(result = this.result) != null) {
5000	>	for (int i = baseIndex, f, h; batch > 0 &&
5001	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5002	>	if (result.get() != null)
5003	>	return;
5004	>	addToPendingCount(1);
5005	>	new SearchMappingsTask<K,V,U>
5006	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5007	>	searchFunction, result).fork();
5008	>	}
5009	>	while (result.get() == null) {
5010	>	U u;
5011	>	Node<K,V> p;
5012	>	if ((p = advance()) == null) {
5013	>	propagateCompletion();
5014	>	break;
5015	>	}
5016	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5017		if (result.compareAndSet(null, u))
5018	<	tryCompleteComputation(null);
5018	>	quietlyCompleteRoot();
5019		break;
5020		}
5021		}
5929	–	} catch (Throwable ex) {
5930	–	return tryCompleteComputation(ex);
5022		}
5932	–	tryComplete(subtasks);
5933	–	return false;
5023		}
5935	–	public final U getRawResult() { return result.get(); }
5024		}
5025
5026	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5026	>	@SuppressWarnings("serial")
5027	>	static final class ReduceKeysTask<K,V>
5028		extends BulkTask<K,V,K> {
5029		final BiFun<? super K, ? super K, ? extends K> reducer;
5030		K result;
5031		ReduceKeysTask<K,V> rights, nextRight;
5032		ReduceKeysTask
5033	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5033	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5034		ReduceKeysTask<K,V> nextRight,
5035		BiFun<? super K, ? super K, ? extends K> reducer) {
5036	<	super(m, p, b); this.nextRight = nextRight;
5036	>	super(p, b, i, f, t); this.nextRight = nextRight;
5037		this.reducer = reducer;
5038		}
5039	<	@SuppressWarnings("unchecked") public final boolean exec() {
5040	<	final BiFun<? super K, ? super K, ? extends K> reducer =
5041	<	this.reducer;
5042	<	if (reducer == null)
5043	<	return abortOnNullFunction();
5044	<	try {
5045	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5957	<	do {} while (!casPending(c = pending, c+1));
5039	>	public final K getRawResult() { return result; }
5040	>	public final void compute() {
5041	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5042	>	if ((reducer = this.reducer) != null) {
5043	>	for (int i = baseIndex, f, h; batch > 0 &&
5044	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5045	>	addToPendingCount(1);
5046		(rights = new ReduceKeysTask<K,V>
5047	<	(map, this, b >>>= 1, rights, reducer)).fork();
5047	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5048	>	rights, reducer)).fork();
5049		}
5050		K r = null;
5051	<	while (advance() != null) {
5052	<	K u = (K)nextKey;
5053	<	r = (r == null) ? u : reducer.apply(r, u);
5051	>	for (Node<K,V> p; (p = advance()) != null; ) {
5052	>	K u = p.key;
5053	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5054		}
5055		result = r;
5056	<	for (ReduceKeysTask<K,V> t = this, s;;) {
5057	<	int c; BulkTask<K,V,?> par; K tr, sr;
5058	<	if ((c = t.pending) == 0) {
5059	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5060	<	if ((sr = s.result) != null)
5061	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5062	<	}
5063	<	if ((par = t.parent) == null ||
5064	<	!(par instanceof ReduceKeysTask)) {
5065	<	t.quietlyComplete();
5066	<	break;
5978	<	}
5979	<	t = (ReduceKeysTask<K,V>)par;
5056	>	CountedCompleter<?> c;
5057	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5058	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5059	>	t = (ReduceKeysTask<K,V>)c,
5060	>	s = t.rights;
5061	>	while (s != null) {
5062	>	K tr, sr;
5063	>	if ((sr = s.result) != null)
5064	>	t.result = (((tr = t.result) == null) ? sr :
5065	>	reducer.apply(tr, sr));
5066	>	s = t.rights = s.nextRight;
5067		}
5981	–	else if (t.casPending(c, c - 1))
5982	–	break;
5068		}
5984	–	} catch (Throwable ex) {
5985	–	return tryCompleteComputation(ex);
5069		}
5987	–	ReduceKeysTask<K,V> s = rights;
5988	–	if (s != null && !inForkJoinPool()) {
5989	–	do  {
5990	–	if (s.tryUnfork())
5991	–	s.exec();
5992	–	} while ((s = s.nextRight) != null);
5993	–	}
5994	–	return false;
5070		}
5996	–	public final K getRawResult() { return result; }
5071		}
5072
5073	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5073	>	@SuppressWarnings("serial")
5074	>	static final class ReduceValuesTask<K,V>
5075		extends BulkTask<K,V,V> {
5076		final BiFun<? super V, ? super V, ? extends V> reducer;
5077		V result;
5078		ReduceValuesTask<K,V> rights, nextRight;
5079		ReduceValuesTask
5080	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5080	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5081		ReduceValuesTask<K,V> nextRight,
5082		BiFun<? super V, ? super V, ? extends V> reducer) {
5083	<	super(m, p, b); this.nextRight = nextRight;
5083	>	super(p, b, i, f, t); this.nextRight = nextRight;
5084		this.reducer = reducer;
5085		}
5086	<	@SuppressWarnings("unchecked") public final boolean exec() {
5087	<	final BiFun<? super V, ? super V, ? extends V> reducer =
5088	<	this.reducer;
5089	<	if (reducer == null)
5090	<	return abortOnNullFunction();
5091	<	try {
5092	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6018	<	do {} while (!casPending(c = pending, c+1));
5086	>	public final V getRawResult() { return result; }
5087	>	public final void compute() {
5088	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5089	>	if ((reducer = this.reducer) != null) {
5090	>	for (int i = baseIndex, f, h; batch > 0 &&
5091	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5092	>	addToPendingCount(1);
5093		(rights = new ReduceValuesTask<K,V>
5094	<	(map, this, b >>>= 1, rights, reducer)).fork();
5094	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5095	>	rights, reducer)).fork();
5096		}
5097		V r = null;
5098	<	Object v;
5099	<	while ((v = advance()) != null) {
5100	<	V u = (V)v;
6026	<	r = (r == null) ? u : reducer.apply(r, u);
5098	>	for (Node<K,V> p; (p = advance()) != null; ) {
5099	>	V v = p.val;
5100	>	r = (r == null) ? v : reducer.apply(r, v);
5101		}
5102		result = r;
5103	<	for (ReduceValuesTask<K,V> t = this, s;;) {
5104	<	int c; BulkTask<K,V,?> par; V tr, sr;
5105	<	if ((c = t.pending) == 0) {
5106	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5107	<	if ((sr = s.result) != null)
5108	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5109	<	}
5110	<	if ((par = t.parent) == null ||
5111	<	!(par instanceof ReduceValuesTask)) {
5112	<	t.quietlyComplete();
5113	<	break;
6040	<	}
6041	<	t = (ReduceValuesTask<K,V>)par;
5103	>	CountedCompleter<?> c;
5104	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5105	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5106	>	t = (ReduceValuesTask<K,V>)c,
5107	>	s = t.rights;
5108	>	while (s != null) {
5109	>	V tr, sr;
5110	>	if ((sr = s.result) != null)
5111	>	t.result = (((tr = t.result) == null) ? sr :
5112	>	reducer.apply(tr, sr));
5113	>	s = t.rights = s.nextRight;
5114		}
6043	–	else if (t.casPending(c, c - 1))
6044	–	break;
5115		}
6046	–	} catch (Throwable ex) {
6047	–	return tryCompleteComputation(ex);
6048	–	}
6049	–	ReduceValuesTask<K,V> s = rights;
6050	–	if (s != null && !inForkJoinPool()) {
6051	–	do  {
6052	–	if (s.tryUnfork())
6053	–	s.exec();
6054	–	} while ((s = s.nextRight) != null);
5116		}
6056	–	return false;
5117		}
6058	–	public final V getRawResult() { return result; }
5118		}
5119
5120	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5120	>	@SuppressWarnings("serial")
5121	>	static final class ReduceEntriesTask<K,V>
5122		extends BulkTask<K,V,Map.Entry<K,V>> {
5123		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5124		Map.Entry<K,V> result;
5125		ReduceEntriesTask<K,V> rights, nextRight;
5126		ReduceEntriesTask
5127	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5127	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5128		ReduceEntriesTask<K,V> nextRight,
5129		BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5130	<	super(m, p, b); this.nextRight = nextRight;
5130	>	super(p, b, i, f, t); this.nextRight = nextRight;
5131		this.reducer = reducer;
5132		}
5133	<	@SuppressWarnings("unchecked") public final boolean exec() {
5134	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5135	<	this.reducer;
5136	<	if (reducer == null)
5137	<	return abortOnNullFunction();
5138	<	try {
5139	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6080	<	do {} while (!casPending(c = pending, c+1));
5133	>	public final Map.Entry<K,V> getRawResult() { return result; }
5134	>	public final void compute() {
5135	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5136	>	if ((reducer = this.reducer) != null) {
5137	>	for (int i = baseIndex, f, h; batch > 0 &&
5138	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5139	>	addToPendingCount(1);
5140		(rights = new ReduceEntriesTask<K,V>
5141	<	(map, this, b >>>= 1, rights, reducer)).fork();
5141	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5142	>	rights, reducer)).fork();
5143		}
5144		Map.Entry<K,V> r = null;
5145	<	Object v;
5146	<	while ((v = advance()) != null) {
6087	<	Map.Entry<K,V> u = entryFor((K)nextKey, (V)v);
6088	<	r = (r == null) ? u : reducer.apply(r, u);
6089	<	}
5145	>	for (Node<K,V> p; (p = advance()) != null; )
5146	>	r = (r == null) ? p : reducer.apply(r, p);
5147		result = r;
5148	<	for (ReduceEntriesTask<K,V> t = this, s;;) {
5149	<	int c; BulkTask<K,V,?> par; Map.Entry<K,V> tr, sr;
5150	<	if ((c = t.pending) == 0) {
5151	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5152	<	if ((sr = s.result) != null)
5153	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5154	<	}
5155	<	if ((par = t.parent) == null ||
5156	<	!(par instanceof ReduceEntriesTask)) {
5157	<	t.quietlyComplete();
5158	<	break;
6102	<	}
6103	<	t = (ReduceEntriesTask<K,V>)par;
5148	>	CountedCompleter<?> c;
5149	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5150	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5151	>	t = (ReduceEntriesTask<K,V>)c,
5152	>	s = t.rights;
5153	>	while (s != null) {
5154	>	Map.Entry<K,V> tr, sr;
5155	>	if ((sr = s.result) != null)
5156	>	t.result = (((tr = t.result) == null) ? sr :
5157	>	reducer.apply(tr, sr));
5158	>	s = t.rights = s.nextRight;
5159		}
6105	–	else if (t.casPending(c, c - 1))
6106	–	break;
5160		}
6108	–	} catch (Throwable ex) {
6109	–	return tryCompleteComputation(ex);
6110	–	}
6111	–	ReduceEntriesTask<K,V> s = rights;
6112	–	if (s != null && !inForkJoinPool()) {
6113	–	do  {
6114	–	if (s.tryUnfork())
6115	–	s.exec();
6116	–	} while ((s = s.nextRight) != null);
5161		}
6118	–	return false;
5162		}
6120	–	public final Map.Entry<K,V> getRawResult() { return result; }
5163		}
5164
5165	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5165	>	@SuppressWarnings("serial")
5166	>	static final class MapReduceKeysTask<K,V,U>
5167		extends BulkTask<K,V,U> {
5168		final Fun<? super K, ? extends U> transformer;
5169		final BiFun<? super U, ? super U, ? extends U> reducer;
5170		U result;
5171		MapReduceKeysTask<K,V,U> rights, nextRight;
5172		MapReduceKeysTask
5173	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5173	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5174		MapReduceKeysTask<K,V,U> nextRight,
5175		Fun<? super K, ? extends U> transformer,
5176		BiFun<? super U, ? super U, ? extends U> reducer) {
5177	<	super(m, p, b); this.nextRight = nextRight;
5177	>	super(p, b, i, f, t); this.nextRight = nextRight;
5178		this.transformer = transformer;
5179		this.reducer = reducer;
5180		}
5181	<	@SuppressWarnings("unchecked") public final boolean exec() {
5182	<	final Fun<? super K, ? extends U> transformer =
5183	<	this.transformer;
5184	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5185	<	this.reducer;
5186	<	if (transformer == null || reducer == null)
5187	<	return abortOnNullFunction();
5188	<	try {
5189	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6147	<	do {} while (!casPending(c = pending, c+1));
5181	>	public final U getRawResult() { return result; }
5182	>	public final void compute() {
5183	>	final Fun<? super K, ? extends U> transformer;
5184	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5185	>	if ((transformer = this.transformer) != null &&
5186	>	(reducer = this.reducer) != null) {
5187	>	for (int i = baseIndex, f, h; batch > 0 &&
5188	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5189	>	addToPendingCount(1);
5190		(rights = new MapReduceKeysTask<K,V,U>
5191	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5191	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5192	>	rights, transformer, reducer)).fork();
5193		}
5194	<	U r = null, u;
5195	<	while (advance() != null) {
5196	<	if ((u = transformer.apply((K)nextKey)) != null)
5194	>	U r = null;
5195	>	for (Node<K,V> p; (p = advance()) != null; ) {
5196	>	U u;
5197	>	if ((u = transformer.apply(p.key)) != null)
5198		r = (r == null) ? u : reducer.apply(r, u);
5199		}
5200		result = r;
5201	<	for (MapReduceKeysTask<K,V,U> t = this, s;;) {
5202	<	int c; BulkTask<K,V,?> par; U tr, sr;
5203	<	if ((c = t.pending) == 0) {
5204	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5205	<	if ((sr = s.result) != null)
5206	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5207	<	}
5208	<	if ((par = t.parent) == null ||
5209	<	!(par instanceof MapReduceKeysTask)) {
5210	<	t.quietlyComplete();
5211	<	break;
6168	<	}
6169	<	t = (MapReduceKeysTask<K,V,U>)par;
5201	>	CountedCompleter<?> c;
5202	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5203	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5204	>	t = (MapReduceKeysTask<K,V,U>)c,
5205	>	s = t.rights;
5206	>	while (s != null) {
5207	>	U tr, sr;
5208	>	if ((sr = s.result) != null)
5209	>	t.result = (((tr = t.result) == null) ? sr :
5210	>	reducer.apply(tr, sr));
5211	>	s = t.rights = s.nextRight;
5212		}
6171	–	else if (t.casPending(c, c - 1))
6172	–	break;
5213		}
6174	–	} catch (Throwable ex) {
6175	–	return tryCompleteComputation(ex);
6176	–	}
6177	–	MapReduceKeysTask<K,V,U> s = rights;
6178	–	if (s != null && !inForkJoinPool()) {
6179	–	do  {
6180	–	if (s.tryUnfork())
6181	–	s.exec();
6182	–	} while ((s = s.nextRight) != null);
5214		}
6184	–	return false;
5215		}
6186	–	public final U getRawResult() { return result; }
5216		}
5217
5218	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5218	>	@SuppressWarnings("serial")
5219	>	static final class MapReduceValuesTask<K,V,U>
5220		extends BulkTask<K,V,U> {
5221		final Fun<? super V, ? extends U> transformer;
5222		final BiFun<? super U, ? super U, ? extends U> reducer;
5223		U result;
5224		MapReduceValuesTask<K,V,U> rights, nextRight;
5225		MapReduceValuesTask
5226	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5226	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5227		MapReduceValuesTask<K,V,U> nextRight,
5228		Fun<? super V, ? extends U> transformer,
5229		BiFun<? super U, ? super U, ? extends U> reducer) {
5230	<	super(m, p, b); this.nextRight = nextRight;
5230	>	super(p, b, i, f, t); this.nextRight = nextRight;
5231		this.transformer = transformer;
5232		this.reducer = reducer;
5233		}
5234	<	@SuppressWarnings("unchecked") public final boolean exec() {
5235	<	final Fun<? super V, ? extends U> transformer =
5236	<	this.transformer;
5237	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5238	<	this.reducer;
5239	<	if (transformer == null || reducer == null)
5240	<	return abortOnNullFunction();
5241	<	try {
5242	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6213	<	do {} while (!casPending(c = pending, c+1));
5234	>	public final U getRawResult() { return result; }
5235	>	public final void compute() {
5236	>	final Fun<? super V, ? extends U> transformer;
5237	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5238	>	if ((transformer = this.transformer) != null &&
5239	>	(reducer = this.reducer) != null) {
5240	>	for (int i = baseIndex, f, h; batch > 0 &&
5241	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5242	>	addToPendingCount(1);
5243		(rights = new MapReduceValuesTask<K,V,U>
5244	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5244	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5245	>	rights, transformer, reducer)).fork();
5246		}
5247	<	U r = null, u;
5248	<	Object v;
5249	<	while ((v = advance()) != null) {
5250	<	if ((u = transformer.apply((V)v)) != null)
5247	>	U r = null;
5248	>	for (Node<K,V> p; (p = advance()) != null; ) {
5249	>	U u;
5250	>	if ((u = transformer.apply(p.val)) != null)
5251		r = (r == null) ? u : reducer.apply(r, u);
5252		}
5253		result = r;
5254	<	for (MapReduceValuesTask<K,V,U> t = this, s;;) {
5255	<	int c; BulkTask<K,V,?> par; U tr, sr;
5256	<	if ((c = t.pending) == 0) {
5257	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5258	<	if ((sr = s.result) != null)
5259	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5260	<	}
5261	<	if ((par = t.parent) == null ||
5262	<	!(par instanceof MapReduceValuesTask)) {
5263	<	t.quietlyComplete();
5264	<	break;
6235	<	}
6236	<	t = (MapReduceValuesTask<K,V,U>)par;
5254	>	CountedCompleter<?> c;
5255	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5256	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5257	>	t = (MapReduceValuesTask<K,V,U>)c,
5258	>	s = t.rights;
5259	>	while (s != null) {
5260	>	U tr, sr;
5261	>	if ((sr = s.result) != null)
5262	>	t.result = (((tr = t.result) == null) ? sr :
5263	>	reducer.apply(tr, sr));
5264	>	s = t.rights = s.nextRight;
5265		}
6238	–	else if (t.casPending(c, c - 1))
6239	–	break;
5266		}
6241	–	} catch (Throwable ex) {
6242	–	return tryCompleteComputation(ex);
5267		}
6244	–	MapReduceValuesTask<K,V,U> s = rights;
6245	–	if (s != null && !inForkJoinPool()) {
6246	–	do  {
6247	–	if (s.tryUnfork())
6248	–	s.exec();
6249	–	} while ((s = s.nextRight) != null);
6250	–	}
6251	–	return false;
5268		}
6253	–	public final U getRawResult() { return result; }
5269		}
5270
5271	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5271	>	@SuppressWarnings("serial")
5272	>	static final class MapReduceEntriesTask<K,V,U>
5273		extends BulkTask<K,V,U> {
5274		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5275		final BiFun<? super U, ? super U, ? extends U> reducer;
5276		U result;
5277		MapReduceEntriesTask<K,V,U> rights, nextRight;
5278		MapReduceEntriesTask
5279	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5279	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5280		MapReduceEntriesTask<K,V,U> nextRight,
5281		Fun<Map.Entry<K,V>, ? extends U> transformer,
5282		BiFun<? super U, ? super U, ? extends U> reducer) {
5283	<	super(m, p, b); this.nextRight = nextRight;
5283	>	super(p, b, i, f, t); this.nextRight = nextRight;
5284		this.transformer = transformer;
5285		this.reducer = reducer;
5286		}
5287	<	@SuppressWarnings("unchecked") public final boolean exec() {
5288	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5289	<	this.transformer;
5290	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5291	<	this.reducer;
5292	<	if (transformer == null || reducer == null)
5293	<	return abortOnNullFunction();
5294	<	try {
5295	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6280	<	do {} while (!casPending(c = pending, c+1));
5287	>	public final U getRawResult() { return result; }
5288	>	public final void compute() {
5289	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5290	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5291	>	if ((transformer = this.transformer) != null &&
5292	>	(reducer = this.reducer) != null) {
5293	>	for (int i = baseIndex, f, h; batch > 0 &&
5294	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5295	>	addToPendingCount(1);
5296		(rights = new MapReduceEntriesTask<K,V,U>
5297	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5297	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5298	>	rights, transformer, reducer)).fork();
5299		}
5300	<	U r = null, u;
5301	<	Object v;
5302	<	while ((v = advance()) != null) {
5303	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5300	>	U r = null;
5301	>	for (Node<K,V> p; (p = advance()) != null; ) {
5302	>	U u;
5303	>	if ((u = transformer.apply(p)) != null)
5304		r = (r == null) ? u : reducer.apply(r, u);
5305		}
5306		result = r;
5307	<	for (MapReduceEntriesTask<K,V,U> t = this, s;;) {
5308	<	int c; BulkTask<K,V,?> par; U tr, sr;
5309	<	if ((c = t.pending) == 0) {
5310	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5311	<	if ((sr = s.result) != null)
5312	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5313	<	}
5314	<	if ((par = t.parent) == null ||
5315	<	!(par instanceof MapReduceEntriesTask)) {
5316	<	t.quietlyComplete();
5317	<	break;
6302	<	}
6303	<	t = (MapReduceEntriesTask<K,V,U>)par;
5307	>	CountedCompleter<?> c;
5308	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5309	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5310	>	t = (MapReduceEntriesTask<K,V,U>)c,
5311	>	s = t.rights;
5312	>	while (s != null) {
5313	>	U tr, sr;
5314	>	if ((sr = s.result) != null)
5315	>	t.result = (((tr = t.result) == null) ? sr :
5316	>	reducer.apply(tr, sr));
5317	>	s = t.rights = s.nextRight;
5318		}
6305	–	else if (t.casPending(c, c - 1))
6306	–	break;
5319		}
6308	–	} catch (Throwable ex) {
6309	–	return tryCompleteComputation(ex);
6310	–	}
6311	–	MapReduceEntriesTask<K,V,U> s = rights;
6312	–	if (s != null && !inForkJoinPool()) {
6313	–	do  {
6314	–	if (s.tryUnfork())
6315	–	s.exec();
6316	–	} while ((s = s.nextRight) != null);
5320		}
6318	–	return false;
5321		}
6320	–	public final U getRawResult() { return result; }
5322		}
5323
5324	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5324	>	@SuppressWarnings("serial")
5325	>	static final class MapReduceMappingsTask<K,V,U>
5326		extends BulkTask<K,V,U> {
5327		final BiFun<? super K, ? super V, ? extends U> transformer;
5328		final BiFun<? super U, ? super U, ? extends U> reducer;
5329		U result;
5330		MapReduceMappingsTask<K,V,U> rights, nextRight;
5331		MapReduceMappingsTask
5332	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5332	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5333		MapReduceMappingsTask<K,V,U> nextRight,
5334		BiFun<? super K, ? super V, ? extends U> transformer,
5335		BiFun<? super U, ? super U, ? extends U> reducer) {
5336	<	super(m, p, b); this.nextRight = nextRight;
5336	>	super(p, b, i, f, t); this.nextRight = nextRight;
5337		this.transformer = transformer;
5338		this.reducer = reducer;
5339		}
5340	<	@SuppressWarnings("unchecked") public final boolean exec() {
5341	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5342	<	this.transformer;
5343	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5344	<	this.reducer;
5345	<	if (transformer == null || reducer == null)
5346	<	return abortOnNullFunction();
5347	<	try {
5348	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6347	<	do {} while (!casPending(c = pending, c+1));
5340	>	public final U getRawResult() { return result; }
5341	>	public final void compute() {
5342	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5343	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5344	>	if ((transformer = this.transformer) != null &&
5345	>	(reducer = this.reducer) != null) {
5346	>	for (int i = baseIndex, f, h; batch > 0 &&
5347	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5348	>	addToPendingCount(1);
5349		(rights = new MapReduceMappingsTask<K,V,U>
5350	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5350	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5351	>	rights, transformer, reducer)).fork();
5352		}
5353	<	U r = null, u;
5354	<	Object v;
5355	<	while ((v = advance()) != null) {
5356	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5353	>	U r = null;
5354	>	for (Node<K,V> p; (p = advance()) != null; ) {
5355	>	U u;
5356	>	if ((u = transformer.apply(p.key, p.val)) != null)
5357		r = (r == null) ? u : reducer.apply(r, u);
5358		}
5359		result = r;
5360	<	for (MapReduceMappingsTask<K,V,U> t = this, s;;) {
5361	<	int c; BulkTask<K,V,?> par; U tr, sr;
5362	<	if ((c = t.pending) == 0) {
5363	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5364	<	if ((sr = s.result) != null)
5365	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5366	<	}
5367	<	if ((par = t.parent) == null ||
5368	<	!(par instanceof MapReduceMappingsTask)) {
5369	<	t.quietlyComplete();
5370	<	break;
6369	<	}
6370	<	t = (MapReduceMappingsTask<K,V,U>)par;
5360	>	CountedCompleter<?> c;
5361	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5362	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5363	>	t = (MapReduceMappingsTask<K,V,U>)c,
5364	>	s = t.rights;
5365	>	while (s != null) {
5366	>	U tr, sr;
5367	>	if ((sr = s.result) != null)
5368	>	t.result = (((tr = t.result) == null) ? sr :
5369	>	reducer.apply(tr, sr));
5370	>	s = t.rights = s.nextRight;
5371		}
6372	–	else if (t.casPending(c, c - 1))
6373	–	break;
5372		}
6375	–	} catch (Throwable ex) {
6376	–	return tryCompleteComputation(ex);
5373		}
6378	–	MapReduceMappingsTask<K,V,U> s = rights;
6379	–	if (s != null && !inForkJoinPool()) {
6380	–	do  {
6381	–	if (s.tryUnfork())
6382	–	s.exec();
6383	–	} while ((s = s.nextRight) != null);
6384	–	}
6385	–	return false;
5374		}
6387	–	public final U getRawResult() { return result; }
5375		}
5376
5377	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5377	>	@SuppressWarnings("serial")
5378	>	static final class MapReduceKeysToDoubleTask<K,V>
5379		extends BulkTask<K,V,Double> {
5380		final ObjectToDouble<? super K> transformer;
5381		final DoubleByDoubleToDouble reducer;
#	Line 6395 | Line 5383 | public class ConcurrentHashMapV8<K, V>
5383		double result;
5384		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5385		MapReduceKeysToDoubleTask
5386	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5386	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5387		MapReduceKeysToDoubleTask<K,V> nextRight,
5388		ObjectToDouble<? super K> transformer,
5389		double basis,
5390		DoubleByDoubleToDouble reducer) {
5391	<	super(m, p, b); this.nextRight = nextRight;
5391	>	super(p, b, i, f, t); this.nextRight = nextRight;
5392		this.transformer = transformer;
5393		this.basis = basis; this.reducer = reducer;
5394		}
5395	<	@SuppressWarnings("unchecked") public final boolean exec() {
5396	<	final ObjectToDouble<? super K> transformer =
5397	<	this.transformer;
5398	<	final DoubleByDoubleToDouble reducer = this.reducer;
5399	<	if (transformer == null || reducer == null)
5400	<	return abortOnNullFunction();
5401	<	try {
5402	<	final double id = this.basis;
5403	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5404	<	do {} while (!casPending(c = pending, c+1));
5395	>	public final Double getRawResult() { return result; }
5396	>	public final void compute() {
5397	>	final ObjectToDouble<? super K> transformer;
5398	>	final DoubleByDoubleToDouble reducer;
5399	>	if ((transformer = this.transformer) != null &&
5400	>	(reducer = this.reducer) != null) {
5401	>	double r = this.basis;
5402	>	for (int i = baseIndex, f, h; batch > 0 &&
5403	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5404	>	addToPendingCount(1);
5405		(rights = new MapReduceKeysToDoubleTask<K,V>
5406	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5406	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5407	>	rights, transformer, r, reducer)).fork();
5408		}
5409	<	double r = id;
5410	<	while (advance() != null)
6422	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5409	>	for (Node<K,V> p; (p = advance()) != null; )
5410	>	r = reducer.apply(r, transformer.apply(p.key));
5411		result = r;
5412	<	for (MapReduceKeysToDoubleTask<K,V> t = this, s;;) {
5413	<	int c; BulkTask<K,V,?> par;
5414	<	if ((c = t.pending) == 0) {
5415	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5416	<	t.result = reducer.apply(t.result, s.result);
5417	<	}
5418	<	if ((par = t.parent) == null ||
5419	<	!(par instanceof MapReduceKeysToDoubleTask)) {
6432	<	t.quietlyComplete();
6433	<	break;
6434	<	}
6435	<	t = (MapReduceKeysToDoubleTask<K,V>)par;
5412	>	CountedCompleter<?> c;
5413	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5414	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5415	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5416	>	s = t.rights;
5417	>	while (s != null) {
5418	>	t.result = reducer.apply(t.result, s.result);
5419	>	s = t.rights = s.nextRight;
5420		}
6437	–	else if (t.casPending(c, c - 1))
6438	–	break;
5421		}
6440	–	} catch (Throwable ex) {
6441	–	return tryCompleteComputation(ex);
5422		}
6443	–	MapReduceKeysToDoubleTask<K,V> s = rights;
6444	–	if (s != null && !inForkJoinPool()) {
6445	–	do  {
6446	–	if (s.tryUnfork())
6447	–	s.exec();
6448	–	} while ((s = s.nextRight) != null);
6449	–	}
6450	–	return false;
5423		}
6452	–	public final Double getRawResult() { return result; }
5424		}
5425
5426	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5426	>	@SuppressWarnings("serial")
5427	>	static final class MapReduceValuesToDoubleTask<K,V>
5428		extends BulkTask<K,V,Double> {
5429		final ObjectToDouble<? super V> transformer;
5430		final DoubleByDoubleToDouble reducer;
#	Line 6460 | Line 5432 | public class ConcurrentHashMapV8<K, V>
5432		double result;
5433		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5434		MapReduceValuesToDoubleTask
5435	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5435	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5436		MapReduceValuesToDoubleTask<K,V> nextRight,
5437		ObjectToDouble<? super V> transformer,
5438		double basis,
5439		DoubleByDoubleToDouble reducer) {
5440	<	super(m, p, b); this.nextRight = nextRight;
5440	>	super(p, b, i, f, t); this.nextRight = nextRight;
5441		this.transformer = transformer;
5442		this.basis = basis; this.reducer = reducer;
5443		}
5444	<	@SuppressWarnings("unchecked") public final boolean exec() {
5445	<	final ObjectToDouble<? super V> transformer =
5446	<	this.transformer;
5447	<	final DoubleByDoubleToDouble reducer = this.reducer;
5448	<	if (transformer == null || reducer == null)
5449	<	return abortOnNullFunction();
5450	<	try {
5451	<	final double id = this.basis;
5452	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5453	<	do {} while (!casPending(c = pending, c+1));
5444	>	public final Double getRawResult() { return result; }
5445	>	public final void compute() {
5446	>	final ObjectToDouble<? super V> transformer;
5447	>	final DoubleByDoubleToDouble reducer;
5448	>	if ((transformer = this.transformer) != null &&
5449	>	(reducer = this.reducer) != null) {
5450	>	double r = this.basis;
5451	>	for (int i = baseIndex, f, h; batch > 0 &&
5452	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5453	>	addToPendingCount(1);
5454		(rights = new MapReduceValuesToDoubleTask<K,V>
5455	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5455	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5456	>	rights, transformer, r, reducer)).fork();
5457		}
5458	<	double r = id;
5459	<	Object v;
6487	<	while ((v = advance()) != null)
6488	<	r = reducer.apply(r, transformer.apply((V)v));
5458	>	for (Node<K,V> p; (p = advance()) != null; )
5459	>	r = reducer.apply(r, transformer.apply(p.val));
5460		result = r;
5461	<	for (MapReduceValuesToDoubleTask<K,V> t = this, s;;) {
5462	<	int c; BulkTask<K,V,?> par;
5463	<	if ((c = t.pending) == 0) {
5464	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5465	<	t.result = reducer.apply(t.result, s.result);
5466	<	}
5467	<	if ((par = t.parent) == null ||
5468	<	!(par instanceof MapReduceValuesToDoubleTask)) {
6498	<	t.quietlyComplete();
6499	<	break;
6500	<	}
6501	<	t = (MapReduceValuesToDoubleTask<K,V>)par;
5461	>	CountedCompleter<?> c;
5462	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5463	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5464	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5465	>	s = t.rights;
5466	>	while (s != null) {
5467	>	t.result = reducer.apply(t.result, s.result);
5468	>	s = t.rights = s.nextRight;
5469		}
6503	–	else if (t.casPending(c, c - 1))
6504	–	break;
5470		}
6506	–	} catch (Throwable ex) {
6507	–	return tryCompleteComputation(ex);
6508	–	}
6509	–	MapReduceValuesToDoubleTask<K,V> s = rights;
6510	–	if (s != null && !inForkJoinPool()) {
6511	–	do  {
6512	–	if (s.tryUnfork())
6513	–	s.exec();
6514	–	} while ((s = s.nextRight) != null);
5471		}
6516	–	return false;
5472		}
6518	–	public final Double getRawResult() { return result; }
5473		}
5474
5475	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5475	>	@SuppressWarnings("serial")
5476	>	static final class MapReduceEntriesToDoubleTask<K,V>
5477		extends BulkTask<K,V,Double> {
5478		final ObjectToDouble<Map.Entry<K,V>> transformer;
5479		final DoubleByDoubleToDouble reducer;
#	Line 6526 | Line 5481 | public class ConcurrentHashMapV8<K, V>
5481		double result;
5482		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5483		MapReduceEntriesToDoubleTask
5484	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5484	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5485		MapReduceEntriesToDoubleTask<K,V> nextRight,
5486		ObjectToDouble<Map.Entry<K,V>> transformer,
5487		double basis,
5488		DoubleByDoubleToDouble reducer) {
5489	<	super(m, p, b); this.nextRight = nextRight;
5489	>	super(p, b, i, f, t); this.nextRight = nextRight;
5490		this.transformer = transformer;
5491		this.basis = basis; this.reducer = reducer;
5492		}
5493	<	@SuppressWarnings("unchecked") public final boolean exec() {
5494	<	final ObjectToDouble<Map.Entry<K,V>> transformer =
5495	<	this.transformer;
5496	<	final DoubleByDoubleToDouble reducer = this.reducer;
5497	<	if (transformer == null || reducer == null)
5498	<	return abortOnNullFunction();
5499	<	try {
5500	<	final double id = this.basis;
5501	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5502	<	do {} while (!casPending(c = pending, c+1));
5493	>	public final Double getRawResult() { return result; }
5494	>	public final void compute() {
5495	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
5496	>	final DoubleByDoubleToDouble reducer;
5497	>	if ((transformer = this.transformer) != null &&
5498	>	(reducer = this.reducer) != null) {
5499	>	double r = this.basis;
5500	>	for (int i = baseIndex, f, h; batch > 0 &&
5501	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5502	>	addToPendingCount(1);
5503		(rights = new MapReduceEntriesToDoubleTask<K,V>
5504	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5504	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5505	>	rights, transformer, r, reducer)).fork();
5506		}
5507	<	double r = id;
5508	<	Object v;
6553	<	while ((v = advance()) != null)
6554	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5507	>	for (Node<K,V> p; (p = advance()) != null; )
5508	>	r = reducer.apply(r, transformer.apply(p));
5509		result = r;
5510	<	for (MapReduceEntriesToDoubleTask<K,V> t = this, s;;) {
5511	<	int c; BulkTask<K,V,?> par;
5512	<	if ((c = t.pending) == 0) {
5513	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5514	<	t.result = reducer.apply(t.result, s.result);
5515	<	}
5516	<	if ((par = t.parent) == null ||
5517	<	!(par instanceof MapReduceEntriesToDoubleTask)) {
6564	<	t.quietlyComplete();
6565	<	break;
6566	<	}
6567	<	t = (MapReduceEntriesToDoubleTask<K,V>)par;
5510	>	CountedCompleter<?> c;
5511	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5512	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5513	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5514	>	s = t.rights;
5515	>	while (s != null) {
5516	>	t.result = reducer.apply(t.result, s.result);
5517	>	s = t.rights = s.nextRight;
5518		}
6569	–	else if (t.casPending(c, c - 1))
6570	–	break;
5519		}
6572	–	} catch (Throwable ex) {
6573	–	return tryCompleteComputation(ex);
5520		}
6575	–	MapReduceEntriesToDoubleTask<K,V> s = rights;
6576	–	if (s != null && !inForkJoinPool()) {
6577	–	do  {
6578	–	if (s.tryUnfork())
6579	–	s.exec();
6580	–	} while ((s = s.nextRight) != null);
6581	–	}
6582	–	return false;
5521		}
6584	–	public final Double getRawResult() { return result; }
5522		}
5523
5524	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5524	>	@SuppressWarnings("serial")
5525	>	static final class MapReduceMappingsToDoubleTask<K,V>
5526		extends BulkTask<K,V,Double> {
5527		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5528		final DoubleByDoubleToDouble reducer;
#	Line 6592 | Line 5530 | public class ConcurrentHashMapV8<K, V>
5530		double result;
5531		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5532		MapReduceMappingsToDoubleTask
5533	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5533	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5534		MapReduceMappingsToDoubleTask<K,V> nextRight,
5535		ObjectByObjectToDouble<? super K, ? super V> transformer,
5536		double basis,
5537		DoubleByDoubleToDouble reducer) {
5538	<	super(m, p, b); this.nextRight = nextRight;
5538	>	super(p, b, i, f, t); this.nextRight = nextRight;
5539		this.transformer = transformer;
5540		this.basis = basis; this.reducer = reducer;
5541		}
5542	<	@SuppressWarnings("unchecked") public final boolean exec() {
5543	<	final ObjectByObjectToDouble<? super K, ? super V> transformer =
5544	<	this.transformer;
5545	<	final DoubleByDoubleToDouble reducer = this.reducer;
5546	<	if (transformer == null || reducer == null)
5547	<	return abortOnNullFunction();
5548	<	try {
5549	<	final double id = this.basis;
5550	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5551	<	do {} while (!casPending(c = pending, c+1));
5542	>	public final Double getRawResult() { return result; }
5543	>	public final void compute() {
5544	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5545	>	final DoubleByDoubleToDouble reducer;
5546	>	if ((transformer = this.transformer) != null &&
5547	>	(reducer = this.reducer) != null) {
5548	>	double r = this.basis;
5549	>	for (int i = baseIndex, f, h; batch > 0 &&
5550	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5551	>	addToPendingCount(1);
5552		(rights = new MapReduceMappingsToDoubleTask<K,V>
5553	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5553	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5554	>	rights, transformer, r, reducer)).fork();
5555		}
5556	<	double r = id;
5557	<	Object v;
6619	<	while ((v = advance()) != null)
6620	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5556	>	for (Node<K,V> p; (p = advance()) != null; )
5557	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5558		result = r;
5559	<	for (MapReduceMappingsToDoubleTask<K,V> t = this, s;;) {
5560	<	int c; BulkTask<K,V,?> par;
5561	<	if ((c = t.pending) == 0) {
5562	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5563	<	t.result = reducer.apply(t.result, s.result);
5564	<	}
5565	<	if ((par = t.parent) == null ||
5566	<	!(par instanceof MapReduceMappingsToDoubleTask)) {
6630	<	t.quietlyComplete();
6631	<	break;
6632	<	}
6633	<	t = (MapReduceMappingsToDoubleTask<K,V>)par;
5559	>	CountedCompleter<?> c;
5560	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5561	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5562	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5563	>	s = t.rights;
5564	>	while (s != null) {
5565	>	t.result = reducer.apply(t.result, s.result);
5566	>	s = t.rights = s.nextRight;
5567		}
6635	–	else if (t.casPending(c, c - 1))
6636	–	break;
5568		}
6638	–	} catch (Throwable ex) {
6639	–	return tryCompleteComputation(ex);
6640	–	}
6641	–	MapReduceMappingsToDoubleTask<K,V> s = rights;
6642	–	if (s != null && !inForkJoinPool()) {
6643	–	do  {
6644	–	if (s.tryUnfork())
6645	–	s.exec();
6646	–	} while ((s = s.nextRight) != null);
5569		}
6648	–	return false;
5570		}
6650	–	public final Double getRawResult() { return result; }
5571		}
5572
5573	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5573	>	@SuppressWarnings("serial")
5574	>	static final class MapReduceKeysToLongTask<K,V>
5575		extends BulkTask<K,V,Long> {
5576		final ObjectToLong<? super K> transformer;
5577		final LongByLongToLong reducer;
#	Line 6658 | Line 5579 | public class ConcurrentHashMapV8<K, V>
5579		long result;
5580		MapReduceKeysToLongTask<K,V> rights, nextRight;
5581		MapReduceKeysToLongTask
5582	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5582	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5583		MapReduceKeysToLongTask<K,V> nextRight,
5584		ObjectToLong<? super K> transformer,
5585		long basis,
5586		LongByLongToLong reducer) {
5587	<	super(m, p, b); this.nextRight = nextRight;
5587	>	super(p, b, i, f, t); this.nextRight = nextRight;
5588		this.transformer = transformer;
5589		this.basis = basis; this.reducer = reducer;
5590		}
5591	<	@SuppressWarnings("unchecked") public final boolean exec() {
5592	<	final ObjectToLong<? super K> transformer =
5593	<	this.transformer;
5594	<	final LongByLongToLong reducer = this.reducer;
5595	<	if (transformer == null || reducer == null)
5596	<	return abortOnNullFunction();
5597	<	try {
5598	<	final long id = this.basis;
5599	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5600	<	do {} while (!casPending(c = pending, c+1));
5591	>	public final Long getRawResult() { return result; }
5592	>	public final void compute() {
5593	>	final ObjectToLong<? super K> transformer;
5594	>	final LongByLongToLong reducer;
5595	>	if ((transformer = this.transformer) != null &&
5596	>	(reducer = this.reducer) != null) {
5597	>	long r = this.basis;
5598	>	for (int i = baseIndex, f, h; batch > 0 &&
5599	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5600	>	addToPendingCount(1);
5601		(rights = new MapReduceKeysToLongTask<K,V>
5602	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5602	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5603	>	rights, transformer, r, reducer)).fork();
5604		}
5605	<	long r = id;
5606	<	while (advance() != null)
6685	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5605	>	for (Node<K,V> p; (p = advance()) != null; )
5606	>	r = reducer.apply(r, transformer.apply(p.key));
5607		result = r;
5608	<	for (MapReduceKeysToLongTask<K,V> t = this, s;;) {
5609	<	int c; BulkTask<K,V,?> par;
5610	<	if ((c = t.pending) == 0) {
5611	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5612	<	t.result = reducer.apply(t.result, s.result);
5613	<	}
5614	<	if ((par = t.parent) == null ||
5615	<	!(par instanceof MapReduceKeysToLongTask)) {
6695	<	t.quietlyComplete();
6696	<	break;
6697	<	}
6698	<	t = (MapReduceKeysToLongTask<K,V>)par;
5608	>	CountedCompleter<?> c;
5609	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5610	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5611	>	t = (MapReduceKeysToLongTask<K,V>)c,
5612	>	s = t.rights;
5613	>	while (s != null) {
5614	>	t.result = reducer.apply(t.result, s.result);
5615	>	s = t.rights = s.nextRight;
5616		}
6700	–	else if (t.casPending(c, c - 1))
6701	–	break;
5617		}
6703	–	} catch (Throwable ex) {
6704	–	return tryCompleteComputation(ex);
6705	–	}
6706	–	MapReduceKeysToLongTask<K,V> s = rights;
6707	–	if (s != null && !inForkJoinPool()) {
6708	–	do  {
6709	–	if (s.tryUnfork())
6710	–	s.exec();
6711	–	} while ((s = s.nextRight) != null);
5618		}
6713	–	return false;
5619		}
6715	–	public final Long getRawResult() { return result; }
5620		}
5621
5622	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5622	>	@SuppressWarnings("serial")
5623	>	static final class MapReduceValuesToLongTask<K,V>
5624		extends BulkTask<K,V,Long> {
5625		final ObjectToLong<? super V> transformer;
5626		final LongByLongToLong reducer;
#	Line 6723 | Line 5628 | public class ConcurrentHashMapV8<K, V>
5628		long result;
5629		MapReduceValuesToLongTask<K,V> rights, nextRight;
5630		MapReduceValuesToLongTask
5631	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5631	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5632		MapReduceValuesToLongTask<K,V> nextRight,
5633		ObjectToLong<? super V> transformer,
5634		long basis,
5635		LongByLongToLong reducer) {
5636	<	super(m, p, b); this.nextRight = nextRight;
5636	>	super(p, b, i, f, t); this.nextRight = nextRight;
5637		this.transformer = transformer;
5638		this.basis = basis; this.reducer = reducer;
5639		}
5640	<	@SuppressWarnings("unchecked") public final boolean exec() {
5641	<	final ObjectToLong<? super V> transformer =
5642	<	this.transformer;
5643	<	final LongByLongToLong reducer = this.reducer;
5644	<	if (transformer == null || reducer == null)
5645	<	return abortOnNullFunction();
5646	<	try {
5647	<	final long id = this.basis;
5648	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5649	<	do {} while (!casPending(c = pending, c+1));
5640	>	public final Long getRawResult() { return result; }
5641	>	public final void compute() {
5642	>	final ObjectToLong<? super V> transformer;
5643	>	final LongByLongToLong reducer;
5644	>	if ((transformer = this.transformer) != null &&
5645	>	(reducer = this.reducer) != null) {
5646	>	long r = this.basis;
5647	>	for (int i = baseIndex, f, h; batch > 0 &&
5648	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5649	>	addToPendingCount(1);
5650		(rights = new MapReduceValuesToLongTask<K,V>
5651	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5651	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5652	>	rights, transformer, r, reducer)).fork();
5653		}
5654	<	long r = id;
5655	<	Object v;
6750	<	while ((v = advance()) != null)
6751	<	r = reducer.apply(r, transformer.apply((V)v));
5654	>	for (Node<K,V> p; (p = advance()) != null; )
5655	>	r = reducer.apply(r, transformer.apply(p.val));
5656		result = r;
5657	<	for (MapReduceValuesToLongTask<K,V> t = this, s;;) {
5658	<	int c; BulkTask<K,V,?> par;
5659	<	if ((c = t.pending) == 0) {
5660	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5661	<	t.result = reducer.apply(t.result, s.result);
5662	<	}
5663	<	if ((par = t.parent) == null ||
5664	<	!(par instanceof MapReduceValuesToLongTask)) {
6761	<	t.quietlyComplete();
6762	<	break;
6763	<	}
6764	<	t = (MapReduceValuesToLongTask<K,V>)par;
5657	>	CountedCompleter<?> c;
5658	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5659	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5660	>	t = (MapReduceValuesToLongTask<K,V>)c,
5661	>	s = t.rights;
5662	>	while (s != null) {
5663	>	t.result = reducer.apply(t.result, s.result);
5664	>	s = t.rights = s.nextRight;
5665		}
6766	–	else if (t.casPending(c, c - 1))
6767	–	break;
5666		}
6769	–	} catch (Throwable ex) {
6770	–	return tryCompleteComputation(ex);
5667		}
6772	–	MapReduceValuesToLongTask<K,V> s = rights;
6773	–	if (s != null && !inForkJoinPool()) {
6774	–	do  {
6775	–	if (s.tryUnfork())
6776	–	s.exec();
6777	–	} while ((s = s.nextRight) != null);
6778	–	}
6779	–	return false;
5668		}
6781	–	public final Long getRawResult() { return result; }
5669		}
5670
5671	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5671	>	@SuppressWarnings("serial")
5672	>	static final class MapReduceEntriesToLongTask<K,V>
5673		extends BulkTask<K,V,Long> {
5674		final ObjectToLong<Map.Entry<K,V>> transformer;
5675		final LongByLongToLong reducer;
#	Line 6789 | Line 5677 | public class ConcurrentHashMapV8<K, V>
5677		long result;
5678		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5679		MapReduceEntriesToLongTask
5680	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5680	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5681		MapReduceEntriesToLongTask<K,V> nextRight,
5682		ObjectToLong<Map.Entry<K,V>> transformer,
5683		long basis,
5684		LongByLongToLong reducer) {
5685	<	super(m, p, b); this.nextRight = nextRight;
5685	>	super(p, b, i, f, t); this.nextRight = nextRight;
5686		this.transformer = transformer;
5687		this.basis = basis; this.reducer = reducer;
5688		}
5689	<	@SuppressWarnings("unchecked") public final boolean exec() {
5690	<	final ObjectToLong<Map.Entry<K,V>> transformer =
5691	<	this.transformer;
5692	<	final LongByLongToLong reducer = this.reducer;
5693	<	if (transformer == null || reducer == null)
5694	<	return abortOnNullFunction();
5695	<	try {
5696	<	final long id = this.basis;
5697	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5698	<	do {} while (!casPending(c = pending, c+1));
5689	>	public final Long getRawResult() { return result; }
5690	>	public final void compute() {
5691	>	final ObjectToLong<Map.Entry<K,V>> transformer;
5692	>	final LongByLongToLong reducer;
5693	>	if ((transformer = this.transformer) != null &&
5694	>	(reducer = this.reducer) != null) {
5695	>	long r = this.basis;
5696	>	for (int i = baseIndex, f, h; batch > 0 &&
5697	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5698	>	addToPendingCount(1);
5699		(rights = new MapReduceEntriesToLongTask<K,V>
5700	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5700	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5701	>	rights, transformer, r, reducer)).fork();
5702		}
5703	<	long r = id;
5704	<	Object v;
6816	<	while ((v = advance()) != null)
6817	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5703	>	for (Node<K,V> p; (p = advance()) != null; )
5704	>	r = reducer.apply(r, transformer.apply(p));
5705		result = r;
5706	<	for (MapReduceEntriesToLongTask<K,V> t = this, s;;) {
5707	<	int c; BulkTask<K,V,?> par;
5708	<	if ((c = t.pending) == 0) {
5709	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5710	<	t.result = reducer.apply(t.result, s.result);
5711	<	}
5712	<	if ((par = t.parent) == null ||
5713	<	!(par instanceof MapReduceEntriesToLongTask)) {
6827	<	t.quietlyComplete();
6828	<	break;
6829	<	}
6830	<	t = (MapReduceEntriesToLongTask<K,V>)par;
5706	>	CountedCompleter<?> c;
5707	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5708	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5709	>	t = (MapReduceEntriesToLongTask<K,V>)c,
5710	>	s = t.rights;
5711	>	while (s != null) {
5712	>	t.result = reducer.apply(t.result, s.result);
5713	>	s = t.rights = s.nextRight;
5714		}
6832	–	else if (t.casPending(c, c - 1))
6833	–	break;
5715		}
6835	–	} catch (Throwable ex) {
6836	–	return tryCompleteComputation(ex);
6837	–	}
6838	–	MapReduceEntriesToLongTask<K,V> s = rights;
6839	–	if (s != null && !inForkJoinPool()) {
6840	–	do  {
6841	–	if (s.tryUnfork())
6842	–	s.exec();
6843	–	} while ((s = s.nextRight) != null);
5716		}
6845	–	return false;
5717		}
6847	–	public final Long getRawResult() { return result; }
5718		}
5719
5720	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5720	>	@SuppressWarnings("serial")
5721	>	static final class MapReduceMappingsToLongTask<K,V>
5722		extends BulkTask<K,V,Long> {
5723		final ObjectByObjectToLong<? super K, ? super V> transformer;
5724		final LongByLongToLong reducer;
#	Line 6855 | Line 5726 | public class ConcurrentHashMapV8<K, V>
5726		long result;
5727		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5728		MapReduceMappingsToLongTask
5729	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5729	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5730		MapReduceMappingsToLongTask<K,V> nextRight,
5731		ObjectByObjectToLong<? super K, ? super V> transformer,
5732		long basis,
5733		LongByLongToLong reducer) {
5734	<	super(m, p, b); this.nextRight = nextRight;
5734	>	super(p, b, i, f, t); this.nextRight = nextRight;
5735		this.transformer = transformer;
5736		this.basis = basis; this.reducer = reducer;
5737		}
5738	<	@SuppressWarnings("unchecked") public final boolean exec() {
5739	<	final ObjectByObjectToLong<? super K, ? super V> transformer =
5740	<	this.transformer;
5741	<	final LongByLongToLong reducer = this.reducer;
5742	<	if (transformer == null || reducer == null)
5743	<	return abortOnNullFunction();
5744	<	try {
5745	<	final long id = this.basis;
5746	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5747	<	do {} while (!casPending(c = pending, c+1));
5738	>	public final Long getRawResult() { return result; }
5739	>	public final void compute() {
5740	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
5741	>	final LongByLongToLong reducer;
5742	>	if ((transformer = this.transformer) != null &&
5743	>	(reducer = this.reducer) != null) {
5744	>	long r = this.basis;
5745	>	for (int i = baseIndex, f, h; batch > 0 &&
5746	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5747	>	addToPendingCount(1);
5748		(rights = new MapReduceMappingsToLongTask<K,V>
5749	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5749	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5750	>	rights, transformer, r, reducer)).fork();
5751		}
5752	<	long r = id;
5753	<	Object v;
6882	<	while ((v = advance()) != null)
6883	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5752	>	for (Node<K,V> p; (p = advance()) != null; )
5753	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5754		result = r;
5755	<	for (MapReduceMappingsToLongTask<K,V> t = this, s;;) {
5756	<	int c; BulkTask<K,V,?> par;
5757	<	if ((c = t.pending) == 0) {
5758	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5759	<	t.result = reducer.apply(t.result, s.result);
5760	<	}
5761	<	if ((par = t.parent) == null ||
5762	<	!(par instanceof MapReduceMappingsToLongTask)) {
6893	<	t.quietlyComplete();
6894	<	break;
6895	<	}
6896	<	t = (MapReduceMappingsToLongTask<K,V>)par;
5755	>	CountedCompleter<?> c;
5756	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5757	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5758	>	t = (MapReduceMappingsToLongTask<K,V>)c,
5759	>	s = t.rights;
5760	>	while (s != null) {
5761	>	t.result = reducer.apply(t.result, s.result);
5762	>	s = t.rights = s.nextRight;
5763		}
6898	–	else if (t.casPending(c, c - 1))
6899	–	break;
5764		}
6901	–	} catch (Throwable ex) {
6902	–	return tryCompleteComputation(ex);
6903	–	}
6904	–	MapReduceMappingsToLongTask<K,V> s = rights;
6905	–	if (s != null && !inForkJoinPool()) {
6906	–	do  {
6907	–	if (s.tryUnfork())
6908	–	s.exec();
6909	–	} while ((s = s.nextRight) != null);
5765		}
6911	–	return false;
5766		}
6913	–	public final Long getRawResult() { return result; }
5767		}
5768
5769	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5769	>	@SuppressWarnings("serial")
5770	>	static final class MapReduceKeysToIntTask<K,V>
5771		extends BulkTask<K,V,Integer> {
5772		final ObjectToInt<? super K> transformer;
5773		final IntByIntToInt reducer;
#	Line 6921 | Line 5775 | public class ConcurrentHashMapV8<K, V>
5775		int result;
5776		MapReduceKeysToIntTask<K,V> rights, nextRight;
5777		MapReduceKeysToIntTask
5778	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5778	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5779		MapReduceKeysToIntTask<K,V> nextRight,
5780		ObjectToInt<? super K> transformer,
5781		int basis,
5782		IntByIntToInt reducer) {
5783	<	super(m, p, b); this.nextRight = nextRight;
5783	>	super(p, b, i, f, t); this.nextRight = nextRight;
5784		this.transformer = transformer;
5785		this.basis = basis; this.reducer = reducer;
5786		}
5787	<	@SuppressWarnings("unchecked") public final boolean exec() {
5788	<	final ObjectToInt<? super K> transformer =
5789	<	this.transformer;
5790	<	final IntByIntToInt reducer = this.reducer;
5791	<	if (transformer == null || reducer == null)
5792	<	return abortOnNullFunction();
5793	<	try {
5794	<	final int id = this.basis;
5795	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5796	<	do {} while (!casPending(c = pending, c+1));
5787	>	public final Integer getRawResult() { return result; }
5788	>	public final void compute() {
5789	>	final ObjectToInt<? super K> transformer;
5790	>	final IntByIntToInt reducer;
5791	>	if ((transformer = this.transformer) != null &&
5792	>	(reducer = this.reducer) != null) {
5793	>	int r = this.basis;
5794	>	for (int i = baseIndex, f, h; batch > 0 &&
5795	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5796	>	addToPendingCount(1);
5797		(rights = new MapReduceKeysToIntTask<K,V>
5798	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5798	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5799	>	rights, transformer, r, reducer)).fork();
5800		}
5801	<	int r = id;
5802	<	while (advance() != null)
6948	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5801	>	for (Node<K,V> p; (p = advance()) != null; )
5802	>	r = reducer.apply(r, transformer.apply(p.key));
5803		result = r;
5804	<	for (MapReduceKeysToIntTask<K,V> t = this, s;;) {
5805	<	int c; BulkTask<K,V,?> par;
5806	<	if ((c = t.pending) == 0) {
5807	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5808	<	t.result = reducer.apply(t.result, s.result);
5809	<	}
5810	<	if ((par = t.parent) == null ||
5811	<	!(par instanceof MapReduceKeysToIntTask)) {
6958	<	t.quietlyComplete();
6959	<	break;
6960	<	}
6961	<	t = (MapReduceKeysToIntTask<K,V>)par;
5804	>	CountedCompleter<?> c;
5805	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5806	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5807	>	t = (MapReduceKeysToIntTask<K,V>)c,
5808	>	s = t.rights;
5809	>	while (s != null) {
5810	>	t.result = reducer.apply(t.result, s.result);
5811	>	s = t.rights = s.nextRight;
5812		}
6963	–	else if (t.casPending(c, c - 1))
6964	–	break;
5813		}
6966	–	} catch (Throwable ex) {
6967	–	return tryCompleteComputation(ex);
5814		}
6969	–	MapReduceKeysToIntTask<K,V> s = rights;
6970	–	if (s != null && !inForkJoinPool()) {
6971	–	do  {
6972	–	if (s.tryUnfork())
6973	–	s.exec();
6974	–	} while ((s = s.nextRight) != null);
6975	–	}
6976	–	return false;
5815		}
6978	–	public final Integer getRawResult() { return result; }
5816		}
5817
5818	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5818	>	@SuppressWarnings("serial")
5819	>	static final class MapReduceValuesToIntTask<K,V>
5820		extends BulkTask<K,V,Integer> {
5821		final ObjectToInt<? super V> transformer;
5822		final IntByIntToInt reducer;
#	Line 6986 | Line 5824 | public class ConcurrentHashMapV8<K, V>
5824		int result;
5825		MapReduceValuesToIntTask<K,V> rights, nextRight;
5826		MapReduceValuesToIntTask
5827	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5827	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5828		MapReduceValuesToIntTask<K,V> nextRight,
5829		ObjectToInt<? super V> transformer,
5830		int basis,
5831		IntByIntToInt reducer) {
5832	<	super(m, p, b); this.nextRight = nextRight;
5832	>	super(p, b, i, f, t); this.nextRight = nextRight;
5833		this.transformer = transformer;
5834		this.basis = basis; this.reducer = reducer;
5835		}
5836	<	@SuppressWarnings("unchecked") public final boolean exec() {
5837	<	final ObjectToInt<? super V> transformer =
5838	<	this.transformer;
5839	<	final IntByIntToInt reducer = this.reducer;
5840	<	if (transformer == null || reducer == null)
5841	<	return abortOnNullFunction();
5842	<	try {
5843	<	final int id = this.basis;
5844	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5845	<	do {} while (!casPending(c = pending, c+1));
5836	>	public final Integer getRawResult() { return result; }
5837	>	public final void compute() {
5838	>	final ObjectToInt<? super V> transformer;
5839	>	final IntByIntToInt reducer;
5840	>	if ((transformer = this.transformer) != null &&
5841	>	(reducer = this.reducer) != null) {
5842	>	int r = this.basis;
5843	>	for (int i = baseIndex, f, h; batch > 0 &&
5844	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5845	>	addToPendingCount(1);
5846		(rights = new MapReduceValuesToIntTask<K,V>
5847	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5847	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5848	>	rights, transformer, r, reducer)).fork();
5849		}
5850	<	int r = id;
5851	<	Object v;
7013	<	while ((v = advance()) != null)
7014	<	r = reducer.apply(r, transformer.apply((V)v));
5850	>	for (Node<K,V> p; (p = advance()) != null; )
5851	>	r = reducer.apply(r, transformer.apply(p.val));
5852		result = r;
5853	<	for (MapReduceValuesToIntTask<K,V> t = this, s;;) {
5854	<	int c; BulkTask<K,V,?> par;
5855	<	if ((c = t.pending) == 0) {
5856	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5857	<	t.result = reducer.apply(t.result, s.result);
5858	<	}
5859	<	if ((par = t.parent) == null ||
5860	<	!(par instanceof MapReduceValuesToIntTask)) {
7024	<	t.quietlyComplete();
7025	<	break;
7026	<	}
7027	<	t = (MapReduceValuesToIntTask<K,V>)par;
5853	>	CountedCompleter<?> c;
5854	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5855	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5856	>	t = (MapReduceValuesToIntTask<K,V>)c,
5857	>	s = t.rights;
5858	>	while (s != null) {
5859	>	t.result = reducer.apply(t.result, s.result);
5860	>	s = t.rights = s.nextRight;
5861		}
7029	–	else if (t.casPending(c, c - 1))
7030	–	break;
5862		}
7032	–	} catch (Throwable ex) {
7033	–	return tryCompleteComputation(ex);
7034	–	}
7035	–	MapReduceValuesToIntTask<K,V> s = rights;
7036	–	if (s != null && !inForkJoinPool()) {
7037	–	do  {
7038	–	if (s.tryUnfork())
7039	–	s.exec();
7040	–	} while ((s = s.nextRight) != null);
5863		}
7042	–	return false;
5864		}
7044	–	public final Integer getRawResult() { return result; }
5865		}
5866
5867	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
5867	>	@SuppressWarnings("serial")
5868	>	static final class MapReduceEntriesToIntTask<K,V>
5869		extends BulkTask<K,V,Integer> {
5870		final ObjectToInt<Map.Entry<K,V>> transformer;
5871		final IntByIntToInt reducer;
#	Line 7052 | Line 5873 | public class ConcurrentHashMapV8<K, V>
5873		int result;
5874		MapReduceEntriesToIntTask<K,V> rights, nextRight;
5875		MapReduceEntriesToIntTask
5876	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5876	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5877		MapReduceEntriesToIntTask<K,V> nextRight,
5878		ObjectToInt<Map.Entry<K,V>> transformer,
5879		int basis,
5880		IntByIntToInt reducer) {
5881	<	super(m, p, b); this.nextRight = nextRight;
5881	>	super(p, b, i, f, t); this.nextRight = nextRight;
5882		this.transformer = transformer;
5883		this.basis = basis; this.reducer = reducer;
5884		}
5885	<	@SuppressWarnings("unchecked") public final boolean exec() {
5886	<	final ObjectToInt<Map.Entry<K,V>> transformer =
5887	<	this.transformer;
5888	<	final IntByIntToInt reducer = this.reducer;
5889	<	if (transformer == null || reducer == null)
5890	<	return abortOnNullFunction();
5891	<	try {
5892	<	final int id = this.basis;
5893	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5894	<	do {} while (!casPending(c = pending, c+1));
5885	>	public final Integer getRawResult() { return result; }
5886	>	public final void compute() {
5887	>	final ObjectToInt<Map.Entry<K,V>> transformer;
5888	>	final IntByIntToInt reducer;
5889	>	if ((transformer = this.transformer) != null &&
5890	>	(reducer = this.reducer) != null) {
5891	>	int r = this.basis;
5892	>	for (int i = baseIndex, f, h; batch > 0 &&
5893	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5894	>	addToPendingCount(1);
5895		(rights = new MapReduceEntriesToIntTask<K,V>
5896	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5896	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5897	>	rights, transformer, r, reducer)).fork();
5898		}
5899	<	int r = id;
5900	<	Object v;
7079	<	while ((v = advance()) != null)
7080	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5899	>	for (Node<K,V> p; (p = advance()) != null; )
5900	>	r = reducer.apply(r, transformer.apply(p));
5901		result = r;
5902	<	for (MapReduceEntriesToIntTask<K,V> t = this, s;;) {
5903	<	int c; BulkTask<K,V,?> par;
5904	<	if ((c = t.pending) == 0) {
5905	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5906	<	t.result = reducer.apply(t.result, s.result);
5907	<	}
5908	<	if ((par = t.parent) == null ||
5909	<	!(par instanceof MapReduceEntriesToIntTask)) {
7090	<	t.quietlyComplete();
7091	<	break;
7092	<	}
7093	<	t = (MapReduceEntriesToIntTask<K,V>)par;
5902	>	CountedCompleter<?> c;
5903	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5904	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
5905	>	t = (MapReduceEntriesToIntTask<K,V>)c,
5906	>	s = t.rights;
5907	>	while (s != null) {
5908	>	t.result = reducer.apply(t.result, s.result);
5909	>	s = t.rights = s.nextRight;
5910		}
7095	–	else if (t.casPending(c, c - 1))
7096	–	break;
5911		}
7098	–	} catch (Throwable ex) {
7099	–	return tryCompleteComputation(ex);
5912		}
7101	–	MapReduceEntriesToIntTask<K,V> s = rights;
7102	–	if (s != null && !inForkJoinPool()) {
7103	–	do  {
7104	–	if (s.tryUnfork())
7105	–	s.exec();
7106	–	} while ((s = s.nextRight) != null);
7107	–	}
7108	–	return false;
5913		}
7110	–	public final Integer getRawResult() { return result; }
5914		}
5915
5916	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
5916	>	@SuppressWarnings("serial")
5917	>	static final class MapReduceMappingsToIntTask<K,V>
5918		extends BulkTask<K,V,Integer> {
5919		final ObjectByObjectToInt<? super K, ? super V> transformer;
5920		final IntByIntToInt reducer;
#	Line 7118 | Line 5922 | public class ConcurrentHashMapV8<K, V>
5922		int result;
5923		MapReduceMappingsToIntTask<K,V> rights, nextRight;
5924		MapReduceMappingsToIntTask
5925	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5926	<	MapReduceMappingsToIntTask<K,V> rights,
5925	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5926	>	MapReduceMappingsToIntTask<K,V> nextRight,
5927		ObjectByObjectToInt<? super K, ? super V> transformer,
5928		int basis,
5929		IntByIntToInt reducer) {
5930	<	super(m, p, b); this.nextRight = nextRight;
5930	>	super(p, b, i, f, t); this.nextRight = nextRight;
5931		this.transformer = transformer;
5932		this.basis = basis; this.reducer = reducer;
5933		}
5934	<	@SuppressWarnings("unchecked") public final boolean exec() {
5935	<	final ObjectByObjectToInt<? super K, ? super V> transformer =
5936	<	this.transformer;
5937	<	final IntByIntToInt reducer = this.reducer;
5938	<	if (transformer == null || reducer == null)
5939	<	return abortOnNullFunction();
5940	<	try {
5941	<	final int id = this.basis;
5942	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5943	<	do {} while (!casPending(c = pending, c+1));
5934	>	public final Integer getRawResult() { return result; }
5935	>	public final void compute() {
5936	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
5937	>	final IntByIntToInt reducer;
5938	>	if ((transformer = this.transformer) != null &&
5939	>	(reducer = this.reducer) != null) {
5940	>	int r = this.basis;
5941	>	for (int i = baseIndex, f, h; batch > 0 &&
5942	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5943	>	addToPendingCount(1);
5944		(rights = new MapReduceMappingsToIntTask<K,V>
5945	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5945	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5946	>	rights, transformer, r, reducer)).fork();
5947		}
5948	<	int r = id;
5949	<	Object v;
7145	<	while ((v = advance()) != null)
7146	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5948	>	for (Node<K,V> p; (p = advance()) != null; )
5949	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5950		result = r;
5951	<	for (MapReduceMappingsToIntTask<K,V> t = this, s;;) {
5952	<	int c; BulkTask<K,V,?> par;
5953	<	if ((c = t.pending) == 0) {
5954	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5955	<	t.result = reducer.apply(t.result, s.result);
5951	>	CountedCompleter<?> c;
5952	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5953	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
5954	>	t = (MapReduceMappingsToIntTask<K,V>)c,
5955	>	s = t.rights;
5956	>	while (s != null) {
5957	>	t.result = reducer.apply(t.result, s.result);
5958	>	s = t.rights = s.nextRight;
5959	>	}
5960	>	}
5961	>	}
5962	>	}
5963	>	}
5964	>
5965	>	/* ---------------- Counters -------------- */
5966	>
5967	>	// Adapted from LongAdder and Striped64.
5968	>	// See their internal docs for explanation.
5969	>
5970	>	// A padded cell for distributing counts
5971	>	static final class CounterCell {
5972	>	volatile long p0, p1, p2, p3, p4, p5, p6;
5973	>	volatile long value;
5974	>	volatile long q0, q1, q2, q3, q4, q5, q6;
5975	>	CounterCell(long x) { value = x; }
5976	>	}
5977	>
5978	>	/**
5979	>	* Holder for the thread-local hash code determining which
5980	>	* CounterCell to use. The code is initialized via the
5981	>	* counterHashCodeGenerator, but may be moved upon collisions.
5982	>	*/
5983	>	static final class CounterHashCode {
5984	>	int code;
5985	>	}
5986	>
5987	>	/**
5988	>	* Generates initial value for per-thread CounterHashCodes
5989	>	*/
5990	>	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
5991	>
5992	>	/**
5993	>	* Increment for counterHashCodeGenerator. See class ThreadLocal
5994	>	* for explanation.
5995	>	*/
5996	>	static final int SEED_INCREMENT = 0x61c88647;
5997	>
5998	>	/**
5999	>	* Per-thread counter hash codes. Shared across all instances.
6000	>	*/
6001	>	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
6002	>	new ThreadLocal<CounterHashCode>();
6003	>
6004	>
6005	>	final long sumCount() {
6006	>	CounterCell[] as = counterCells; CounterCell a;
6007	>	long sum = baseCount;
6008	>	if (as != null) {
6009	>	for (int i = 0; i < as.length; ++i) {
6010	>	if ((a = as[i]) != null)
6011	>	sum += a.value;
6012	>	}
6013	>	}
6014	>	return sum;
6015	>	}
6016	>
6017	>	// See LongAdder version for explanation
6018	>	private final void fullAddCount(long x, CounterHashCode hc,
6019	>	boolean wasUncontended) {
6020	>	int h;
6021	>	if (hc == null) {
6022	>	hc = new CounterHashCode();
6023	>	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
6024	>	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
6025	>	threadCounterHashCode.set(hc);
6026	>	}
6027	>	else
6028	>	h = hc.code;
6029	>	boolean collide = false;                // True if last slot nonempty
6030	>	for (;;) {
6031	>	CounterCell[] as; CounterCell a; int n; long v;
6032	>	if ((as = counterCells) != null && (n = as.length) > 0) {
6033	>	if ((a = as[(n - 1) & h]) == null) {
6034	>	if (cellsBusy == 0) {            // Try to attach new Cell
6035	>	CounterCell r = new CounterCell(x); // Optimistic create
6036	>	if (cellsBusy == 0 &&
6037	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6038	>	boolean created = false;
6039	>	try {               // Recheck under lock
6040	>	CounterCell[] rs; int m, j;
6041	>	if ((rs = counterCells) != null &&
6042	>	(m = rs.length) > 0 &&
6043	>	rs[j = (m - 1) & h] == null) {
6044	>	rs[j] = r;
6045	>	created = true;
6046	>	}
6047	>	} finally {
6048	>	cellsBusy = 0;
6049	>	}
6050	>	if (created)
6051	>	break;
6052	>	continue;           // Slot is now non-empty
6053		}
6054	<	if ((par = t.parent) == null ||
6055	<	!(par instanceof MapReduceMappingsToIntTask)) {
6056	<	t.quietlyComplete();
6057	<	break;
6054	>	}
6055	>	collide = false;
6056	>	}
6057	>	else if (!wasUncontended)       // CAS already known to fail
6058	>	wasUncontended = true;      // Continue after rehash
6059	>	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
6060	>	break;
6061	>	else if (counterCells != as || n >= NCPU)
6062	>	collide = false;            // At max size or stale
6063	>	else if (!collide)
6064	>	collide = true;
6065	>	else if (cellsBusy == 0 &&
6066	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6067	>	try {
6068	>	if (counterCells == as) {// Expand table unless stale
6069	>	CounterCell[] rs = new CounterCell[n << 1];
6070	>	for (int i = 0; i < n; ++i)
6071	>	rs[i] = as[i];
6072	>	counterCells = rs;
6073		}
6074	<	t = (MapReduceMappingsToIntTask<K,V>)par;
6074	>	} finally {
6075	>	cellsBusy = 0;
6076		}
6077	<	else if (t.casPending(c, c - 1))
6078	<	break;
6077	>	collide = false;
6078	>	continue;                   // Retry with expanded table
6079		}
6080	<	} catch (Throwable ex) {
6081	<	return tryCompleteComputation(ex);
6082	<	}
6083	<	MapReduceMappingsToIntTask<K,V> s = rights;
6084	<	if (s != null && !inForkJoinPool()) {
6085	<	do  {
6086	<	if (s.tryUnfork())
6087	<	s.exec();
6088	<	} while ((s = s.nextRight) != null);
6080	>	h ^= h << 13;                   // Rehash
6081	>	h ^= h >>> 17;
6082	>	h ^= h << 5;
6083	>	}
6084	>	else if (cellsBusy == 0 && counterCells == as &&
6085	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6086	>	boolean init = false;
6087	>	try {                           // Initialize table
6088	>	if (counterCells == as) {
6089	>	CounterCell[] rs = new CounterCell[2];
6090	>	rs[h & 1] = new CounterCell(x);
6091	>	counterCells = rs;
6092	>	init = true;
6093	>	}
6094	>	} finally {
6095	>	cellsBusy = 0;
6096	>	}
6097	>	if (init)
6098	>	break;
6099		}
6100	<	return false;
6100	>	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
6101	>	break;                          // Fall back on using base
6102		}
6103	<	public final Integer getRawResult() { return result; }
6103	>	hc.code = h;                            // Record index for next time
6104		}
6105
6106		// Unsafe mechanics
6107	<	private static final sun.misc.Unsafe UNSAFE;
6108	<	private static final long counterOffset;
6109	<	private static final long sizeCtlOffset;
6107	>	private static final sun.misc.Unsafe U;
6108	>	private static final long SIZECTL;
6109	>	private static final long TRANSFERINDEX;
6110	>	private static final long TRANSFERORIGIN;
6111	>	private static final long BASECOUNT;
6112	>	private static final long CELLSBUSY;
6113	>	private static final long CELLVALUE;
6114		private static final long ABASE;
6115		private static final int ASHIFT;
6116
6117		static {
7187	–	int ss;
6118		try {
6119	<	UNSAFE = getUnsafe();
6119	>	U = getUnsafe();
6120		Class<?> k = ConcurrentHashMapV8.class;
6121	<	counterOffset = UNSAFE.objectFieldOffset
7192	<	(k.getDeclaredField("counter"));
7193	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6121	>	SIZECTL = U.objectFieldOffset
6122		(k.getDeclaredField("sizeCtl"));
6123	<	Class<?> sc = Node[].class;
6124	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6125	<	ss = UNSAFE.arrayIndexScale(sc);
6123	>	TRANSFERINDEX = U.objectFieldOffset
6124	>	(k.getDeclaredField("transferIndex"));
6125	>	TRANSFERORIGIN = U.objectFieldOffset
6126	>	(k.getDeclaredField("transferOrigin"));
6127	>	BASECOUNT = U.objectFieldOffset
6128	>	(k.getDeclaredField("baseCount"));
6129	>	CELLSBUSY = U.objectFieldOffset
6130	>	(k.getDeclaredField("cellsBusy"));
6131	>	Class<?> ck = CounterCell.class;
6132	>	CELLVALUE = U.objectFieldOffset
6133	>	(ck.getDeclaredField("value"));
6134	>	Class<?> ak = Node[].class;
6135	>	ABASE = U.arrayBaseOffset(ak);
6136	>	int scale = U.arrayIndexScale(ak);
6137	>	if ((scale & (scale - 1)) != 0)
6138	>	throw new Error("data type scale not a power of two");
6139	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6140		} catch (Exception e) {
6141		throw new Error(e);
6142		}
7201	–	if ((ss & (ss-1)) != 0)
7202	–	throw new Error("data type scale not a power of two");
7203	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6143		}
6144
6145		/**
#	Line 7213 | Line 6152 | public class ConcurrentHashMapV8<K, V>
6152		private static sun.misc.Unsafe getUnsafe() {
6153		try {
6154		return sun.misc.Unsafe.getUnsafe();
6155	<	} catch (SecurityException se) {
6156	<	try {
6157	<	return java.security.AccessController.doPrivileged
6158	<	(new java.security
6159	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6160	<	public sun.misc.Unsafe run() throws Exception {
6161	<	java.lang.reflect.Field f = sun.misc
6162	<	.Unsafe.class.getDeclaredField("theUnsafe");
6163	<	f.setAccessible(true);
6164	<	return (sun.misc.Unsafe) f.get(null);
6165	<	}});
6166	<	} catch (java.security.PrivilegedActionException e) {
6167	<	throw new RuntimeException("Could not initialize intrinsics",
6168	<	e.getCause());
6169	<	}
6155	>	} catch (SecurityException tryReflectionInstead) {}
6156	>	try {
6157	>	return java.security.AccessController.doPrivileged
6158	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6159	>	public sun.misc.Unsafe run() throws Exception {
6160	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6161	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6162	>	f.setAccessible(true);
6163	>	Object x = f.get(null);
6164	>	if (k.isInstance(x))
6165	>	return k.cast(x);
6166	>	}
6167	>	throw new NoSuchFieldError("the Unsafe");
6168	>	}});
6169	>	} catch (java.security.PrivilegedActionException e) {
6170	>	throw new RuntimeException("Could not initialize intrinsics",
6171	>	e.getCause());
6172		}
6173		}
6174		}

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