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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.81 by dl, Sat Dec 8 14:10:38 2012 UTC vs.
Revision 1.108 by jsr166, Mon Jul 1 19:19:31 2013 UTC

#	Line 6 | Line 6
6
7		package jsr166e;
8
9	<	import java.util.Comparator;
10	<	import java.util.Arrays;
11	<	import java.util.Map;
12	<	import java.util.Set;
13	<	import java.util.Collection;
14	<	import java.util.AbstractMap;
15	<	import java.util.AbstractSet;
16	<	import java.util.AbstractCollection;
17	<	import java.util.Hashtable;
18	<	import java.util.HashMap;
19	<	import java.util.Iterator;
20	<	import java.util.Enumeration;
21	<	import java.util.ConcurrentModificationException;
22	<	import java.util.NoSuchElementException;
23	<	import java.util.concurrent.ConcurrentMap;
24	<	import java.util.concurrent.ThreadLocalRandom;
25	<	import java.util.concurrent.locks.LockSupport;
26	<	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
27	<	import java.util.concurrent.atomic.AtomicReference;
9	>	import jsr166e.ForkJoinPool;
10
11	+	import java.io.ObjectStreamField;
12		import java.io.Serializable;
13	<
14	<	import java.util.Comparator;
13	>	import java.lang.reflect.ParameterizedType;
14	>	import java.lang.reflect.Type;
15		import java.util.Arrays;
33	–	import java.util.Map;
34	–	import java.util.Set;
16		import java.util.Collection;
17	<	import java.util.AbstractMap;
18	<	import java.util.AbstractSet;
19	<	import java.util.AbstractCollection;
39	<	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;
43	<	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;
46	–	import java.util.concurrent.ThreadLocalRandom;
47	–	import java.util.concurrent.locks.LockSupport;
48	–	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 102 | 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 110 | Line 90 | import java.io.Serializable;
90		* mapped values are (perhaps transiently) not used or all take the
91		* same mapping value.
92		*
113	–	* <p>A ConcurrentHashMapV8 can be used as scalable frequency map (a
114	–	* form of histogram or multiset) by using {@link LongAdder} values
115	–	* and initializing via {@link #computeIfAbsent}. For example, to add
116	–	* a count to a {@code ConcurrentHashMapV8<String,LongAdder> freqs}, you
117	–	* can use {@code freqs.computeIfAbsent(k -> new
118	–	* LongAdder()).increment();}
119	–	*
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 124 | 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
142	<	* change while computation is in progress; and except for forEach
143	<	* 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 167 | Line 138 | import java.io.Serializable;
138		* <li> Reductions to scalar doubles, longs, and ints, using a
139		* given basis value.</li>
140		*
170	–	* </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 213 | 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 236 | 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
247	<	* portion of the elements, and so may be amenable to parallel
248	<	* execution.
249	<	*
250	<	* <p>This interface exports a subset of expected JDK8
251	<	* functionality.
252	<	*
253	<	* <p>Sample usage: Here is one (of the several) ways to compute
254	<	* the sum of the values held in a map using the ForkJoin
255	<	* framework. As illustrated here, Spliterators are well suited to
256	<	* designs in which a task repeatedly splits off half its work
257	<	* into forked subtasks until small enough to process directly,
258	<	* and then joins these subtasks. Variants of this style can also
259	<	* be used in completion-based designs.
260	<	*
261	<	* <pre>
262	<	* {@code ConcurrentHashMapV8<String, Long> m = ...
263	<	* // split as if have 8 * parallelism, for load balance
264	<	* int n = m.size();
265	<	* int p = aForkJoinPool.getParallelism() * 8;
266	<	* int split = (n < p)? n : p;
267	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
268	<	* // ...
269	<	* static class SumValues extends RecursiveTask<Long> {
270	<	*   final Spliterator<Long> s;
271	<	*   final int split;             // split while > 1
272	<	*   final SumValues nextJoin;    // records forked subtasks to join
273	<	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
274	<	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
275	<	*   }
276	<	*   public Long compute() {
277	<	*     long sum = 0;
278	<	*     SumValues subtasks = null; // fork subtasks
279	<	*     for (int s = split >>> 1; s > 0; s >>>= 1)
280	<	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
281	<	*     while (s.hasNext())        // directly process remaining elements
282	<	*       sum += s.next();
283	<	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
284	<	*       sum += t.join();         // collect subtask results
285	<	*     return sum;
286	<	*   }
287	<	* }
288	<	* }</pre>
226	>	* An object for traversing and partitioning elements of a source.
227	>	* This interface provides a subset of the functionality of JDK8
228	>	* java.util.Spliterator.
229		*/
230	<	public static interface Spliterator<T> extends Iterator<T> {
230	>	public static interface ConcurrentHashMapSpliterator<T> {
231		/**
232	<	* Returns a Spliterator covering approximately half of the
233	<	* elements, guaranteed not to overlap with those subsequently
234	<	* returned by this Spliterator.  After invoking this method,
235	<	* the current Spliterator will <em>not</em> produce any of
296	<	* the elements of the returned Spliterator, but the two
297	<	* Spliterators together will produce all of the elements that
298	<	* would have been produced by this Spliterator had this
299	<	* method not been called. The exact number of elements
300	<	* produced by the returned Spliterator is not guaranteed, and
301	<	* may be zero (i.e., with {@code hasNext()} reporting {@code
302	<	* false}) if this Spliterator cannot be further split.
303	<	*
304	<	* @return a Spliterator covering approximately half of the
305	<	* elements
306	<	* @throws IllegalStateException if this Spliterator has
307	<	* already commenced traversing elements
232	>	* If possible, returns a new spliterator covering
233	>	* approximately one half of the elements, which will not be
234	>	* covered by this spliterator. Returns null if cannot be
235	>	* split.
236		*/
237	<	Spliterator<T> split();
237	>	ConcurrentHashMapSpliterator<T> trySplit();
238	>	/**
239	>	* Returns an estimate of the number of elements covered by
240	>	* this Spliterator.
241	>	*/
242	>	long estimateSize();
243	>
244	>	/** Applies the action to each untraversed element */
245	>	void forEachRemaining(Action<? super T> action);
246	>	/** If an element remains, applies the action and returns true. */
247	>	boolean tryAdvance(Action<? super T> action);
248		}
249
250	+	// Sams
251	+	/** Interface describing a void action of one argument */
252	+	public interface Action<A> { void apply(A a); }
253	+	/** Interface describing a void action of two arguments */
254	+	public interface BiAction<A,B> { void apply(A a, B b); }
255	+	/** Interface describing a function of one argument */
256	+	public interface Fun<A,T> { T apply(A a); }
257	+	/** Interface describing a function of two arguments */
258	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
259	+	/** Interface describing a function mapping its argument to a double */
260	+	public interface ObjectToDouble<A> { double apply(A a); }
261	+	/** Interface describing a function mapping its argument to a long */
262	+	public interface ObjectToLong<A> { long apply(A a); }
263	+	/** Interface describing a function mapping its argument to an int */
264	+	public interface ObjectToInt<A> {int apply(A a); }
265	+	/** Interface describing a function mapping two arguments to a double */
266	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
267	+	/** Interface describing a function mapping two arguments to a long */
268	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
269	+	/** Interface describing a function mapping two arguments to an int */
270	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
271	+	/** Interface describing a function mapping two doubles to a double */
272	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
273	+	/** Interface describing a function mapping two longs to a long */
274	+	public interface LongByLongToLong { long apply(long a, long b); }
275	+	/** Interface describing a function mapping two ints to an int */
276	+	public interface IntByIntToInt { int apply(int a, int b); }
277
278		/*
279		* Overview:
#	Line 320 | 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	>	* insignificant.)
303		*
304		* The table is lazily initialized to a power-of-two size upon the
305		* first insertion.  Each bin in the table normally contains a
#	Line 339 | 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
348	<	* purposes -- they are available anyway because of addressing
349	<	* constraints.  As explained further below, these top bits are
350	<	* used as follows:
351	<	*  00 - Normal
352	<	*  01 - Locked
353	<	*  11 - Locked and may have a thread waiting for lock
354	<	*  10 - Node is a forwarding node
355	<	*
356	<	* The lower 30 bits of each Node's hash field contain a
357	<	* transformation of the key's hash code, except for forwarding
358	<	* nodes, for which the lower bits are zero (and so always have
359	<	* hash field == MOVED).
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 365 | 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
370	<	* construction, so we overlay these by using bits of the Node
371	<	* hash field for lock control (see above), and so normally use
372	<	* builtin monitors only for blocking and signalling using
373	<	* wait/notifyAll constructions. See Node.tryAwaitLock.
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,
381	<	* operations that only conditionally update may inspect nodes
382	<	* until the point of update. This is a converse of sorts to the
383	<	* lazy locking technique described by Herlihy & Shavit.
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 413 | 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
422	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
423	<	* (a specialized form of red-black trees), bounding search time
424	<	* to O(log N).  Each search step in a TreeBin is around twice as
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 432 | 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 483 | 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 because of tree-rotations
466	>	* that may change the root node and/or its linkages.  TreeBins
467	>	* include a simple read-write lock mechanism parasitic on the
468	>	* main bin-synchronization strategy: Structural adjustments
469	>	* associated with an insertion or removal are already bin-locked
470	>	* (and so cannot conflict with other writers) but must wait for
471	>	* ongoing readers to finish. Since there can be only one such
472	>	* waiter, we use a simple scheme using a single "waiter" field to
473	>	* block writers.  However, readers need never block.  If the root
474	>	* lock is held, they proceed along the slow traversal path (via
475	>	* next-pointers) until the lock becomes available or the list is
476	>	* exhausted, whichever comes first. These cases are not fast, but
477	>	* maximize aggregate expected throughput.
478		*
479		* Maintaining API and serialization compatibility with previous
480		* versions of this class introduces several oddities. Mainly: We
#	Line 506 | 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 547 | Line 532 | public class ConcurrentHashMapV8<K, V>
532		private static final float LOAD_FACTOR = 0.75f;
533
534		/**
550	–	* The buffer size for skipped bins during transfers. The
551	–	* value is arbitrary but should be large enough to avoid
552	–	* most locking stalls during resizes.
553	–	*/
554	–	private static final int TRANSFER_BUFFER_SIZE = 32;
555	–
556	–	/**
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.
538	<	*/
539	<	private static final int TREE_THRESHOLD = 8;
540	<
563	<	/*
564	<	* Encodings for special uses of Node hash fields. See above for
565	<	* explanation.
536	>	* bin.  Bins are converted to trees when adding an element to a
537	>	* bin with at least this many nodes. The value must be greater
538	>	* than 2, and should be at least 8 to mesh with assumptions in
539	>	* tree removal about conversion back to plain bins upon
540	>	* shrinkage.
541		*/
542	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
568	<	static final int LOCKED    = 0x40000000; // set/tested only as a bit
569	<	static final int WAITING   = 0xc0000000; // both bits set/tested together
570	<	static final int HASH_BITS = 0x3fffffff; // usable bits of normal node hash
571	<
572	<	/* ---------------- Fields -------------- */
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;
593	<
594	<	// views
595	<	private transient KeySetView<K,V> keySet;
596	<	private transient ValuesView<K,V> values;
597	<	private transient EntrySetView<K,V> entrySet;
598	<
599	<	/** For serialization compatibility. Null unless serialized; see below */
600	<	private Segment<K,V>[] segments;
601	<
602	<	/* ---------------- Table element access -------------- */
566	>	private static final int MIN_TRANSFER_STRIDE = 16;
567
568		/*
569	<	* Volatile access methods are used for table elements as well as
606	<	* elements of in-progress next table while resizing.  Uses are
607	<	* null checked by callers, and implicitly bounds-checked, relying
608	<	* on the invariants that tab arrays have non-zero size, and all
609	<	* indices are masked with (tab.length - 1) which is never
610	<	* negative and always less than length. Note that, to be correct
611	<	* wrt arbitrary concurrency errors by users, bounds checks must
612	<	* operate on local variables, which accounts for some odd-looking
613	<	* inline assignments below.
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 roots of trees
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;
643	<	volatile Object val;
644	<	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 negative hash field
593	>	* are special, and contain null keys and values (but are never
594	>	* exported).  Otherwise, keys and vals are never null.
595	>	*/
596	>	static class Node<K,V> implements Map.Entry<K,V> {
597	>	final int hash;
598	>	final K key;
599	>	volatile V val;
600	>	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 */
659	<	static final int MAX_SPINS =
660	<	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
661	<
662	<	/**
663	<	* Spins a while if LOCKED bit set and this node is the first
664	<	* of its bin, and then sets WAITING bits on hash field and
665	<	* blocks (once) if they are still set.  It is OK for this
666	<	* method to return even if lock is not available upon exit,
667	<	* which enables these simple single-wait mechanics.
668	<	*
669	<	* The corresponding signalling operation is performed within
670	<	* callers: Upon detecting that WAITING has been set when
671	<	* unlocking lock (via a failed CAS from non-waiting LOCKED
672	<	* state), unlockers acquire the sync lock and perform a
673	<	* notifyAll.
674	<	*
675	<	* The initial sanity check on tab and bounds is not currently
676	<	* necessary in the only usages of this method, but enables
677	<	* use in other future contexts.
678	<	*/
679	<	final void tryAwaitLock(Node[] tab, int i) {
680	<	if (tab != null && i >= 0 && i < tab.length) { // sanity check
681	<	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
682	<	int spins = MAX_SPINS, h;
683	<	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
684	<	if (spins >= 0) {
685	<	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
686	<	if (r >= 0 && --spins == 0)
687	<	Thread.yield();  // yield before block
688	<	}
689	<	else if (casHash(h, h | WAITING)) {
690	<	synchronized (this) {
691	<	if (tabAt(tab, i) == this &&
692	<	(hash & WAITING) == WAITING) {
693	<	try {
694	<	wait();
695	<	} catch (InterruptedException ie) {
696	<	try {
697	<	Thread.currentThread().interrupt();
698	<	} catch (SecurityException ignore) {
699	<	}
700	<	}
701	<	}
702	<	else
703	<	notifyAll(); // possibly won race vs signaller
704	<	}
705	<	break;
706	<	}
707	<	}
708	<	}
709	<	}
710	<
711	<	// Unsafe mechanics for casHash
712	<	private static final sun.misc.Unsafe UNSAFE;
713	<	private static final long hashOffset;
714	<
715	<	static {
716	<	try {
717	<	UNSAFE = getUnsafe();
718	<	Class<?> k = Node.class;
719	<	hashOffset = UNSAFE.objectFieldOffset
720	<	(k.getDeclaredField("hash"));
721	<	} catch (Exception e) {
722	<	throw new Error(e);
723	<	}
724	<	}
725	<	}
726	<
727	<	/* ---------------- TreeBins -------------- */
728	<
729	<	/**
730	<	* Nodes for use in TreeBins
731	<	*/
732	<	static final class TreeNode extends Node {
733	<	TreeNode parent;  // red-black tree links
734	<	TreeNode left;
735	<	TreeNode right;
736	<	TreeNode prev;    // needed to unlink next upon deletion
737	<	boolean red;
738	<
739	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
740	<	super(hash, key, val, next);
741	<	this.parent = parent;
742	<	}
743	<	}
744	<
745	<	/**
746	<	* A specialized form of red-black tree for use in bins
747	<	* whose size exceeds a threshold.
748	<	*
749	<	* TreeBins use a special form of comparison for search and
750	<	* related operations (which is the main reason we cannot use
751	<	* existing collections such as TreeMaps). TreeBins contain
752	<	* Comparable elements, but may contain others, as well as
753	<	* elements that are Comparable but not necessarily Comparable<T>
754	<	* for the same T, so we cannot invoke compareTo among them. To
755	<	* handle this, the tree is ordered primarily by hash value, then
756	<	* by getClass().getName() order, and then by Comparator order
757	<	* among elements of the same class.  On lookup at a node, if
758	<	* elements are not comparable or compare as 0, both left and
759	<	* right children may need to be searched in the case of tied hash
760	<	* values. (This corresponds to the full list search that would be
761	<	* necessary if all elements were non-Comparable and had tied
762	<	* hashes.)  The red-black balancing code is updated from
763	<	* pre-jdk-collections
764	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
765	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
766	<	* Algorithms" (CLR).
767	<	*
768	<	* TreeBins also maintain a separate locking discipline than
769	<	* regular bins. Because they are forwarded via special MOVED
770	<	* nodes at bin heads (which can never change once established),
771	<	* we cannot use those nodes as locks. Instead, TreeBin
772	<	* extends AbstractQueuedSynchronizer to support a simple form of
773	<	* read-write lock. For update operations and table validation,
774	<	* the exclusive form of lock behaves in the same way as bin-head
775	<	* locks. However, lookups use shared read-lock mechanics to allow
776	<	* multiple readers in the absence of writers.  Additionally,
777	<	* these lookups do not ever block: While the lock is not
778	<	* available, they proceed along the slow traversal path (via
779	<	* next-pointers) until the lock becomes available or the list is
780	<	* exhausted, whichever comes first. (These cases are not fast,
781	<	* but maximize aggregate expected throughput.)  The AQS mechanics
782	<	* for doing this are straightforward.  The lock state is held as
783	<	* AQS getState().  Read counts are negative; the write count (1)
784	<	* is positive.  There are no signalling preferences among readers
785	<	* and writers. Since we don't need to export full Lock API, we
786	<	* just override the minimal AQS methods and use them directly.
787	<	*/
788	<	static final class TreeBin extends AbstractQueuedSynchronizer {
789	<	private static final long serialVersionUID = 2249069246763182397L;
790	<	transient TreeNode root;  // root of tree
791	<	transient TreeNode first; // head of next-pointer list
792	<
793	<	/* AQS overrides */
794	<	public final boolean isHeldExclusively() { return getState() > 0; }
795	<	public final boolean tryAcquire(int ignore) {
796	<	if (compareAndSetState(0, 1)) {
797	<	setExclusiveOwnerThread(Thread.currentThread());
798	<	return true;
799	<	}
800	<	return false;
801	<	}
802	<	public final boolean tryRelease(int ignore) {
803	<	setExclusiveOwnerThread(null);
804	<	setState(0);
805	<	return true;
806	<	}
807	<	public final int tryAcquireShared(int ignore) {
808	<	for (int c;;) {
809	<	if ((c = getState()) > 0)
810	<	return -1;
811	<	if (compareAndSetState(c, c -1))
812	<	return 1;
813	<	}
814	<	}
815	<	public final boolean tryReleaseShared(int ignore) {
816	<	int c;
817	<	do {} while (!compareAndSetState(c = getState(), c + 1));
818	<	return c == -1;
819	<	}
820	<
821	<	/** From CLR */
822	<	private void rotateLeft(TreeNode p) {
823	<	if (p != null) {
824	<	TreeNode r = p.right, pp, rl;
825	<	if ((rl = p.right = r.left) != null)
826	<	rl.parent = p;
827	<	if ((pp = r.parent = p.parent) == null)
828	<	root = r;
829	<	else if (pp.left == p)
830	<	pp.left = r;
831	<	else
832	<	pp.right = r;
833	<	r.left = p;
834	<	p.parent = r;
835	<	}
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	<	/** From CLR */
618	<	private void rotateRight(TreeNode p) {
619	<	if (p != null) {
620	<	TreeNode l = p.left, pp, lr;
621	<	if ((lr = p.left = l.right) != null)
622	<	lr.parent = p;
623	<	if ((pp = l.parent = p.parent) == null)
845	<	root = l;
846	<	else if (pp.right == p)
847	<	pp.right = l;
848	<	else
849	<	pp.left = l;
850	<	l.right = p;
851	<	p.parent = l;
852	<	}
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	<	* Returns the TreeNode (or null if not found) for the given key
857	<	* starting at given root.
627	>	* Virtualized support for map.get(); overridden in subclasses.
628		*/
629	<	@SuppressWarnings("unchecked") final TreeNode getTreeNode
630	<	(int h, Object k, TreeNode p) {
631	<	Class<?> c = k.getClass();
632	<	while (p != null) {
633	<	int dir, ph;  Object pk; Class<?> pc;
634	<	if ((ph = p.hash) == h) {
635	<	if ((pk = p.key) == k || k.equals(pk))
636	<	return p;
637	<	if (c != (pc = pk.getClass()) ||
868	<	!(k instanceof Comparable) ||
869	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
870	<	if ((dir = (c == pc) ? 0 :
871	<	c.getName().compareTo(pc.getName())) == 0) {
872	<	TreeNode r = null, pl, pr; // check both sides
873	<	if ((pr = p.right) != null && h >= pr.hash &&
874	<	(r = getTreeNode(h, k, pr)) != null)
875	<	return r;
876	<	else if ((pl = p.left) != null && h <= pl.hash)
877	<	dir = -1;
878	<	else // nothing there
879	<	return null;
880	<	}
881	<	}
882	<	}
883	<	else
884	<	dir = (h < ph) ? -1 : 1;
885	<	p = (dir > 0) ? p.right : p.left;
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		}
889	–
890	–	/**
891	–	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
892	–	* read-lock to call getTreeNode, but during failure to get
893	–	* lock, searches along next links.
894	–	*/
895	–	final Object getValue(int h, Object k) {
896	–	Node r = null;
897	–	int c = getState(); // Must read lock state first
898	–	for (Node e = first; e != null; e = e.next) {
899	–	if (c <= 0 && compareAndSetState(c, c - 1)) {
900	–	try {
901	–	r = getTreeNode(h, k, root);
902	–	} finally {
903	–	releaseShared(0);
904	–	}
905	–	break;
906	–	}
907	–	else if ((e.hash & HASH_BITS) == h && k.equals(e.key)) {
908	–	r = e;
909	–	break;
910	–	}
911	–	else
912	–	c = getState();
913	–	}
914	–	return r == null ? null : r.val;
915	–	}
916	–
917	–	/**
918	–	* Finds or adds a node.
919	–	* @return null if added
920	–	*/
921	–	@SuppressWarnings("unchecked") final TreeNode putTreeNode
922	–	(int h, Object k, Object v) {
923	–	Class<?> c = k.getClass();
924	–	TreeNode pp = root, p = null;
925	–	int dir = 0;
926	–	while (pp != null) { // find existing node or leaf to insert at
927	–	int ph;  Object pk; Class<?> pc;
928	–	p = pp;
929	–	if ((ph = p.hash) == h) {
930	–	if ((pk = p.key) == k || k.equals(pk))
931	–	return p;
932	–	if (c != (pc = pk.getClass()) ||
933	–	!(k instanceof Comparable) ||
934	–	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
935	–	TreeNode s = null, r = null, pr;
936	–	if ((dir = (c == pc) ? 0 :
937	–	c.getName().compareTo(pc.getName())) == 0) {
938	–	if ((pr = p.right) != null && h >= pr.hash &&
939	–	(r = getTreeNode(h, k, pr)) != null)
940	–	return r;
941	–	else // continue left
942	–	dir = -1;
943	–	}
944	–	else if ((pr = p.right) != null && h >= pr.hash)
945	–	s = pr;
946	–	if (s != null && (r = getTreeNode(h, k, s)) != null)
947	–	return r;
948	–	}
949	–	}
950	–	else
951	–	dir = (h < ph) ? -1 : 1;
952	–	pp = (dir > 0) ? p.right : p.left;
953	–	}
954	–
955	–	TreeNode f = first;
956	–	TreeNode x = first = new TreeNode(h, k, v, f, p);
957	–	if (p == null)
958	–	root = x;
959	–	else { // attach and rebalance; adapted from CLR
960	–	TreeNode xp, xpp;
961	–	if (f != null)
962	–	f.prev = x;
963	–	if (dir <= 0)
964	–	p.left = x;
965	–	else
966	–	p.right = x;
967	–	x.red = true;
968	–	while (x != null && (xp = x.parent) != null && xp.red &&
969	–	(xpp = xp.parent) != null) {
970	–	TreeNode xppl = xpp.left;
971	–	if (xp == xppl) {
972	–	TreeNode y = xpp.right;
973	–	if (y != null && y.red) {
974	–	y.red = false;
975	–	xp.red = false;
976	–	xpp.red = true;
977	–	x = xpp;
978	–	}
979	–	else {
980	–	if (x == xp.right) {
981	–	rotateLeft(x = xp);
982	–	xpp = (xp = x.parent) == null ? null : xp.parent;
983	–	}
984	–	if (xp != null) {
985	–	xp.red = false;
986	–	if (xpp != null) {
987	–	xpp.red = true;
988	–	rotateRight(xpp);
989	–	}
990	–	}
991	–	}
992	–	}
993	–	else {
994	–	TreeNode y = xppl;
995	–	if (y != null && y.red) {
996	–	y.red = false;
997	–	xp.red = false;
998	–	xpp.red = true;
999	–	x = xpp;
1000	–	}
1001	–	else {
1002	–	if (x == xp.left) {
1003	–	rotateRight(x = xp);
1004	–	xpp = (xp = x.parent) == null ? null : xp.parent;
1005	–	}
1006	–	if (xp != null) {
1007	–	xp.red = false;
1008	–	if (xpp != null) {
1009	–	xpp.red = true;
1010	–	rotateLeft(xpp);
1011	–	}
1012	–	}
1013	–	}
1014	–	}
1015	–	}
1016	–	TreeNode r = root;
1017	–	if (r != null && r.red)
1018	–	r.red = false;
1019	–	}
1020	–	return null;
1021	–	}
1022	–
1023	–	/**
1024	–	* Removes the given node, that must be present before this
1025	–	* call.  This is messier than typical red-black deletion code
1026	–	* because we cannot swap the contents of an interior node
1027	–	* with a leaf successor that is pinned by "next" pointers
1028	–	* that are accessible independently of lock. So instead we
1029	–	* swap the tree linkages.
1030	–	*/
1031	–	final void deleteTreeNode(TreeNode p) {
1032	–	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
1033	–	TreeNode pred = p.prev;
1034	–	if (pred == null)
1035	–	first = next;
1036	–	else
1037	–	pred.next = next;
1038	–	if (next != null)
1039	–	next.prev = pred;
1040	–	TreeNode replacement;
1041	–	TreeNode pl = p.left;
1042	–	TreeNode pr = p.right;
1043	–	if (pl != null && pr != null) {
1044	–	TreeNode s = pr, sl;
1045	–	while ((sl = s.left) != null) // find successor
1046	–	s = sl;
1047	–	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
1048	–	TreeNode sr = s.right;
1049	–	TreeNode pp = p.parent;
1050	–	if (s == pr) { // p was s's direct parent
1051	–	p.parent = s;
1052	–	s.right = p;
1053	–	}
1054	–	else {
1055	–	TreeNode sp = s.parent;
1056	–	if ((p.parent = sp) != null) {
1057	–	if (s == sp.left)
1058	–	sp.left = p;
1059	–	else
1060	–	sp.right = p;
1061	–	}
1062	–	if ((s.right = pr) != null)
1063	–	pr.parent = s;
1064	–	}
1065	–	p.left = null;
1066	–	if ((p.right = sr) != null)
1067	–	sr.parent = p;
1068	–	if ((s.left = pl) != null)
1069	–	pl.parent = s;
1070	–	if ((s.parent = pp) == null)
1071	–	root = s;
1072	–	else if (p == pp.left)
1073	–	pp.left = s;
1074	–	else
1075	–	pp.right = s;
1076	–	replacement = sr;
1077	–	}
1078	–	else
1079	–	replacement = (pl != null) ? pl : pr;
1080	–	TreeNode pp = p.parent;
1081	–	if (replacement == null) {
1082	–	if (pp == null) {
1083	–	root = null;
1084	–	return;
1085	–	}
1086	–	replacement = p;
1087	–	}
1088	–	else {
1089	–	replacement.parent = pp;
1090	–	if (pp == null)
1091	–	root = replacement;
1092	–	else if (p == pp.left)
1093	–	pp.left = replacement;
1094	–	else
1095	–	pp.right = replacement;
1096	–	p.left = p.right = p.parent = null;
1097	–	}
1098	–	if (!p.red) { // rebalance, from CLR
1099	–	TreeNode x = replacement;
1100	–	while (x != null) {
1101	–	TreeNode xp, xpl;
1102	–	if (x.red || (xp = x.parent) == null) {
1103	–	x.red = false;
1104	–	break;
1105	–	}
1106	–	if (x == (xpl = xp.left)) {
1107	–	TreeNode sib = xp.right;
1108	–	if (sib != null && sib.red) {
1109	–	sib.red = false;
1110	–	xp.red = true;
1111	–	rotateLeft(xp);
1112	–	sib = (xp = x.parent) == null ? null : xp.right;
1113	–	}
1114	–	if (sib == null)
1115	–	x = xp;
1116	–	else {
1117	–	TreeNode sl = sib.left, sr = sib.right;
1118	–	if ((sr == null || !sr.red) &&
1119	–	(sl == null || !sl.red)) {
1120	–	sib.red = true;
1121	–	x = xp;
1122	–	}
1123	–	else {
1124	–	if (sr == null || !sr.red) {
1125	–	if (sl != null)
1126	–	sl.red = false;
1127	–	sib.red = true;
1128	–	rotateRight(sib);
1129	–	sib = (xp = x.parent) == null ? null : xp.right;
1130	–	}
1131	–	if (sib != null) {
1132	–	sib.red = (xp == null) ? false : xp.red;
1133	–	if ((sr = sib.right) != null)
1134	–	sr.red = false;
1135	–	}
1136	–	if (xp != null) {
1137	–	xp.red = false;
1138	–	rotateLeft(xp);
1139	–	}
1140	–	x = root;
1141	–	}
1142	–	}
1143	–	}
1144	–	else { // symmetric
1145	–	TreeNode sib = xpl;
1146	–	if (sib != null && sib.red) {
1147	–	sib.red = false;
1148	–	xp.red = true;
1149	–	rotateRight(xp);
1150	–	sib = (xp = x.parent) == null ? null : xp.left;
1151	–	}
1152	–	if (sib == null)
1153	–	x = xp;
1154	–	else {
1155	–	TreeNode sl = sib.left, sr = sib.right;
1156	–	if ((sl == null || !sl.red) &&
1157	–	(sr == null || !sr.red)) {
1158	–	sib.red = true;
1159	–	x = xp;
1160	–	}
1161	–	else {
1162	–	if (sl == null || !sl.red) {
1163	–	if (sr != null)
1164	–	sr.red = false;
1165	–	sib.red = true;
1166	–	rotateLeft(sib);
1167	–	sib = (xp = x.parent) == null ? null : xp.left;
1168	–	}
1169	–	if (sib != null) {
1170	–	sib.red = (xp == null) ? false : xp.red;
1171	–	if ((sl = sib.left) != null)
1172	–	sl.red = false;
1173	–	}
1174	–	if (xp != null) {
1175	–	xp.red = false;
1176	–	rotateRight(xp);
1177	–	}
1178	–	x = root;
1179	–	}
1180	–	}
1181	–	}
1182	–	}
1183	–	}
1184	–	if (p == replacement && (pp = p.parent) != null) {
1185	–	if (p == pp.left) // detach pointers
1186	–	pp.left = null;
1187	–	else if (p == pp.right)
1188	–	pp.right = null;
1189	–	p.parent = null;
1190	–	}
1191	–	}
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.
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 static final int spread(int h) {
662	<	h ^= (h >>> 18) ^ (h >>> 12);
1211	<	return (h ^ (h >>> 10)) & HASH_BITS;
661	>	static final int spread(int h) {
662	>	return (h ^ (h >>> 16)) & HASH_BITS;
663		}
664
665		/**
1215	–	* Replaces a list bin with a tree bin. Call only when locked.
1216	–	* Fails to replace if the given key is non-comparable or table
1217	–	* is, or needs, resizing.
1218	–	*/
1219	–	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
1220	–	if ((key instanceof Comparable) &&
1221	–	(tab.length >= MAXIMUM_CAPACITY || counter.sum() < (long)sizeCtl)) {
1222	–	TreeBin t = new TreeBin();
1223	–	for (Node e = tabAt(tab, index); e != null; e = e.next)
1224	–	t.putTreeNode(e.hash & HASH_BITS, e.key, e.val);
1225	–	setTabAt(tab, index, new Node(MOVED, t, null, null));
1226	–	}
1227	–	}
1228	–
1229	–	/* ---------------- Internal access and update methods -------------- */
1230	–
1231	–	/** Implementation for get and containsKey */
1232	–	private final Object internalGet(Object k) {
1233	–	int h = spread(k.hashCode());
1234	–	retry: for (Node[] tab = table; tab != null;) {
1235	–	Node e, p; Object ek, ev; int eh;      // locals to read fields once
1236	–	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1237	–	if ((eh = e.hash) == MOVED) {
1238	–	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1239	–	return ((TreeBin)ek).getValue(h, k);
1240	–	else {                        // restart with new table
1241	–	tab = (Node[])ek;
1242	–	continue retry;
1243	–	}
1244	–	}
1245	–	else if ((eh & HASH_BITS) == h && (ev = e.val) != null &&
1246	–	((ek = e.key) == k || k.equals(ek)))
1247	–	return ev;
1248	–	}
1249	–	break;
1250	–	}
1251	–	return null;
1252	–	}
1253	–
1254	–	/**
1255	–	* Implementation for the four public remove/replace methods:
1256	–	* Replaces node value with v, conditional upon match of cv if
1257	–	* non-null.  If resulting value is null, delete.
1258	–	*/
1259	–	private final Object internalReplace(Object k, Object v, Object cv) {
1260	–	int h = spread(k.hashCode());
1261	–	Object oldVal = null;
1262	–	for (Node[] tab = table;;) {
1263	–	Node f; int i, fh; Object fk;
1264	–	if (tab == null ||
1265	–	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1266	–	break;
1267	–	else if ((fh = f.hash) == MOVED) {
1268	–	if ((fk = f.key) instanceof TreeBin) {
1269	–	TreeBin t = (TreeBin)fk;
1270	–	boolean validated = false;
1271	–	boolean deleted = false;
1272	–	t.acquire(0);
1273	–	try {
1274	–	if (tabAt(tab, i) == f) {
1275	–	validated = true;
1276	–	TreeNode p = t.getTreeNode(h, k, t.root);
1277	–	if (p != null) {
1278	–	Object pv = p.val;
1279	–	if (cv == null || cv == pv || cv.equals(pv)) {
1280	–	oldVal = pv;
1281	–	if ((p.val = v) == null) {
1282	–	deleted = true;
1283	–	t.deleteTreeNode(p);
1284	–	}
1285	–	}
1286	–	}
1287	–	}
1288	–	} finally {
1289	–	t.release(0);
1290	–	}
1291	–	if (validated) {
1292	–	if (deleted)
1293	–	counter.add(-1L);
1294	–	break;
1295	–	}
1296	–	}
1297	–	else
1298	–	tab = (Node[])fk;
1299	–	}
1300	–	else if ((fh & HASH_BITS) != h && f.next == null) // precheck
1301	–	break;                          // rules out possible existence
1302	–	else if ((fh & LOCKED) != 0) {
1303	–	checkForResize();               // try resizing if can't get lock
1304	–	f.tryAwaitLock(tab, i);
1305	–	}
1306	–	else if (f.casHash(fh, fh | LOCKED)) {
1307	–	boolean validated = false;
1308	–	boolean deleted = false;
1309	–	try {
1310	–	if (tabAt(tab, i) == f) {
1311	–	validated = true;
1312	–	for (Node e = f, pred = null;;) {
1313	–	Object ek, ev;
1314	–	if ((e.hash & HASH_BITS) == h &&
1315	–	((ev = e.val) != null) &&
1316	–	((ek = e.key) == k || k.equals(ek))) {
1317	–	if (cv == null || cv == ev || cv.equals(ev)) {
1318	–	oldVal = ev;
1319	–	if ((e.val = v) == null) {
1320	–	deleted = true;
1321	–	Node en = e.next;
1322	–	if (pred != null)
1323	–	pred.next = en;
1324	–	else
1325	–	setTabAt(tab, i, en);
1326	–	}
1327	–	}
1328	–	break;
1329	–	}
1330	–	pred = e;
1331	–	if ((e = e.next) == null)
1332	–	break;
1333	–	}
1334	–	}
1335	–	} finally {
1336	–	if (!f.casHash(fh | LOCKED, fh)) {
1337	–	f.hash = fh;
1338	–	synchronized (f) { f.notifyAll(); };
1339	–	}
1340	–	}
1341	–	if (validated) {
1342	–	if (deleted)
1343	–	counter.add(-1L);
1344	–	break;
1345	–	}
1346	–	}
1347	–	}
1348	–	return oldVal;
1349	–	}
1350	–
1351	–	/*
1352	–	* Internal versions of the six insertion methods, each a
1353	–	* little more complicated than the last. All have
1354	–	* the same basic structure as the first (internalPut):
1355	–	*  1. If table uninitialized, create
1356	–	*  2. If bin empty, try to CAS new node
1357	–	*  3. If bin stale, use new table
1358	–	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1359	–	*  5. Lock and validate; if valid, scan and add or update
1360	–	*
1361	–	* The others interweave other checks and/or alternative actions:
1362	–	*  * Plain put checks for and performs resize after insertion.
1363	–	*  * putIfAbsent prescans for mapping without lock (and fails to add
1364	–	*    if present), which also makes pre-emptive resize checks worthwhile.
1365	–	*  * computeIfAbsent extends form used in putIfAbsent with additional
1366	–	*    mechanics to deal with, calls, potential exceptions and null
1367	–	*    returns from function call.
1368	–	*  * compute uses the same function-call mechanics, but without
1369	–	*    the prescans
1370	–	*  * merge acts as putIfAbsent in the absent case, but invokes the
1371	–	*    update function if present
1372	–	*  * putAll attempts to pre-allocate enough table space
1373	–	*    and more lazily performs count updates and checks.
1374	–	*
1375	–	* Someday when details settle down a bit more, it might be worth
1376	–	* some factoring to reduce sprawl.
1377	–	*/
1378	–
1379	–	/** Implementation for put */
1380	–	private final Object internalPut(Object k, Object v) {
1381	–	int h = spread(k.hashCode());
1382	–	int count = 0;
1383	–	for (Node[] tab = table;;) {
1384	–	int i; Node f; int fh; Object fk;
1385	–	if (tab == null)
1386	–	tab = initTable();
1387	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1388	–	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1389	–	break;                   // no lock when adding to empty bin
1390	–	}
1391	–	else if ((fh = f.hash) == MOVED) {
1392	–	if ((fk = f.key) instanceof TreeBin) {
1393	–	TreeBin t = (TreeBin)fk;
1394	–	Object oldVal = null;
1395	–	t.acquire(0);
1396	–	try {
1397	–	if (tabAt(tab, i) == f) {
1398	–	count = 2;
1399	–	TreeNode p = t.putTreeNode(h, k, v);
1400	–	if (p != null) {
1401	–	oldVal = p.val;
1402	–	p.val = v;
1403	–	}
1404	–	}
1405	–	} finally {
1406	–	t.release(0);
1407	–	}
1408	–	if (count != 0) {
1409	–	if (oldVal != null)
1410	–	return oldVal;
1411	–	break;
1412	–	}
1413	–	}
1414	–	else
1415	–	tab = (Node[])fk;
1416	–	}
1417	–	else if ((fh & LOCKED) != 0) {
1418	–	checkForResize();
1419	–	f.tryAwaitLock(tab, i);
1420	–	}
1421	–	else if (f.casHash(fh, fh | LOCKED)) {
1422	–	Object oldVal = null;
1423	–	try {                        // needed in case equals() throws
1424	–	if (tabAt(tab, i) == f) {
1425	–	count = 1;
1426	–	for (Node e = f;; ++count) {
1427	–	Object ek, ev;
1428	–	if ((e.hash & HASH_BITS) == h &&
1429	–	(ev = e.val) != null &&
1430	–	((ek = e.key) == k || k.equals(ek))) {
1431	–	oldVal = ev;
1432	–	e.val = v;
1433	–	break;
1434	–	}
1435	–	Node last = e;
1436	–	if ((e = e.next) == null) {
1437	–	last.next = new Node(h, k, v, null);
1438	–	if (count >= TREE_THRESHOLD)
1439	–	replaceWithTreeBin(tab, i, k);
1440	–	break;
1441	–	}
1442	–	}
1443	–	}
1444	–	} finally {                  // unlock and signal if needed
1445	–	if (!f.casHash(fh | LOCKED, fh)) {
1446	–	f.hash = fh;
1447	–	synchronized (f) { f.notifyAll(); };
1448	–	}
1449	–	}
1450	–	if (count != 0) {
1451	–	if (oldVal != null)
1452	–	return oldVal;
1453	–	if (tab.length <= 64)
1454	–	count = 2;
1455	–	break;
1456	–	}
1457	–	}
1458	–	}
1459	–	counter.add(1L);
1460	–	if (count > 1)
1461	–	checkForResize();
1462	–	return null;
1463	–	}
1464	–
1465	–	/** Implementation for putIfAbsent */
1466	–	private final Object internalPutIfAbsent(Object k, Object v) {
1467	–	int h = spread(k.hashCode());
1468	–	int count = 0;
1469	–	for (Node[] tab = table;;) {
1470	–	int i; Node f; int fh; Object fk, fv;
1471	–	if (tab == null)
1472	–	tab = initTable();
1473	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1474	–	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1475	–	break;
1476	–	}
1477	–	else if ((fh = f.hash) == MOVED) {
1478	–	if ((fk = f.key) instanceof TreeBin) {
1479	–	TreeBin t = (TreeBin)fk;
1480	–	Object oldVal = null;
1481	–	t.acquire(0);
1482	–	try {
1483	–	if (tabAt(tab, i) == f) {
1484	–	count = 2;
1485	–	TreeNode p = t.putTreeNode(h, k, v);
1486	–	if (p != null)
1487	–	oldVal = p.val;
1488	–	}
1489	–	} finally {
1490	–	t.release(0);
1491	–	}
1492	–	if (count != 0) {
1493	–	if (oldVal != null)
1494	–	return oldVal;
1495	–	break;
1496	–	}
1497	–	}
1498	–	else
1499	–	tab = (Node[])fk;
1500	–	}
1501	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1502	–	((fk = f.key) == k || k.equals(fk)))
1503	–	return fv;
1504	–	else {
1505	–	Node g = f.next;
1506	–	if (g != null) { // at least 2 nodes -- search and maybe resize
1507	–	for (Node e = g;;) {
1508	–	Object ek, ev;
1509	–	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1510	–	((ek = e.key) == k || k.equals(ek)))
1511	–	return ev;
1512	–	if ((e = e.next) == null) {
1513	–	checkForResize();
1514	–	break;
1515	–	}
1516	–	}
1517	–	}
1518	–	if (((fh = f.hash) & LOCKED) != 0) {
1519	–	checkForResize();
1520	–	f.tryAwaitLock(tab, i);
1521	–	}
1522	–	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1523	–	Object oldVal = null;
1524	–	try {
1525	–	if (tabAt(tab, i) == f) {
1526	–	count = 1;
1527	–	for (Node e = f;; ++count) {
1528	–	Object ek, ev;
1529	–	if ((e.hash & HASH_BITS) == h &&
1530	–	(ev = e.val) != null &&
1531	–	((ek = e.key) == k || k.equals(ek))) {
1532	–	oldVal = ev;
1533	–	break;
1534	–	}
1535	–	Node last = e;
1536	–	if ((e = e.next) == null) {
1537	–	last.next = new Node(h, k, v, null);
1538	–	if (count >= TREE_THRESHOLD)
1539	–	replaceWithTreeBin(tab, i, k);
1540	–	break;
1541	–	}
1542	–	}
1543	–	}
1544	–	} finally {
1545	–	if (!f.casHash(fh | LOCKED, fh)) {
1546	–	f.hash = fh;
1547	–	synchronized (f) { f.notifyAll(); };
1548	–	}
1549	–	}
1550	–	if (count != 0) {
1551	–	if (oldVal != null)
1552	–	return oldVal;
1553	–	if (tab.length <= 64)
1554	–	count = 2;
1555	–	break;
1556	–	}
1557	–	}
1558	–	}
1559	–	}
1560	–	counter.add(1L);
1561	–	if (count > 1)
1562	–	checkForResize();
1563	–	return null;
1564	–	}
1565	–
1566	–	/** Implementation for computeIfAbsent */
1567	–	private final Object internalComputeIfAbsent(K k,
1568	–	Fun<? super K, ?> mf) {
1569	–	int h = spread(k.hashCode());
1570	–	Object val = null;
1571	–	int count = 0;
1572	–	for (Node[] tab = table;;) {
1573	–	Node f; int i, fh; Object fk, fv;
1574	–	if (tab == null)
1575	–	tab = initTable();
1576	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1577	–	Node node = new Node(fh = h | LOCKED, k, null, null);
1578	–	if (casTabAt(tab, i, null, node)) {
1579	–	count = 1;
1580	–	try {
1581	–	if ((val = mf.apply(k)) != null)
1582	–	node.val = val;
1583	–	} finally {
1584	–	if (val == null)
1585	–	setTabAt(tab, i, null);
1586	–	if (!node.casHash(fh, h)) {
1587	–	node.hash = h;
1588	–	synchronized (node) { node.notifyAll(); };
1589	–	}
1590	–	}
1591	–	}
1592	–	if (count != 0)
1593	–	break;
1594	–	}
1595	–	else if ((fh = f.hash) == MOVED) {
1596	–	if ((fk = f.key) instanceof TreeBin) {
1597	–	TreeBin t = (TreeBin)fk;
1598	–	boolean added = false;
1599	–	t.acquire(0);
1600	–	try {
1601	–	if (tabAt(tab, i) == f) {
1602	–	count = 1;
1603	–	TreeNode p = t.getTreeNode(h, k, t.root);
1604	–	if (p != null)
1605	–	val = p.val;
1606	–	else if ((val = mf.apply(k)) != null) {
1607	–	added = true;
1608	–	count = 2;
1609	–	t.putTreeNode(h, k, val);
1610	–	}
1611	–	}
1612	–	} finally {
1613	–	t.release(0);
1614	–	}
1615	–	if (count != 0) {
1616	–	if (!added)
1617	–	return val;
1618	–	break;
1619	–	}
1620	–	}
1621	–	else
1622	–	tab = (Node[])fk;
1623	–	}
1624	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1625	–	((fk = f.key) == k || k.equals(fk)))
1626	–	return fv;
1627	–	else {
1628	–	Node g = f.next;
1629	–	if (g != null) {
1630	–	for (Node e = g;;) {
1631	–	Object ek, ev;
1632	–	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1633	–	((ek = e.key) == k || k.equals(ek)))
1634	–	return ev;
1635	–	if ((e = e.next) == null) {
1636	–	checkForResize();
1637	–	break;
1638	–	}
1639	–	}
1640	–	}
1641	–	if (((fh = f.hash) & LOCKED) != 0) {
1642	–	checkForResize();
1643	–	f.tryAwaitLock(tab, i);
1644	–	}
1645	–	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1646	–	boolean added = false;
1647	–	try {
1648	–	if (tabAt(tab, i) == f) {
1649	–	count = 1;
1650	–	for (Node e = f;; ++count) {
1651	–	Object ek, ev;
1652	–	if ((e.hash & HASH_BITS) == h &&
1653	–	(ev = e.val) != null &&
1654	–	((ek = e.key) == k || k.equals(ek))) {
1655	–	val = ev;
1656	–	break;
1657	–	}
1658	–	Node last = e;
1659	–	if ((e = e.next) == null) {
1660	–	if ((val = mf.apply(k)) != null) {
1661	–	added = true;
1662	–	last.next = new Node(h, k, val, null);
1663	–	if (count >= TREE_THRESHOLD)
1664	–	replaceWithTreeBin(tab, i, k);
1665	–	}
1666	–	break;
1667	–	}
1668	–	}
1669	–	}
1670	–	} finally {
1671	–	if (!f.casHash(fh | LOCKED, fh)) {
1672	–	f.hash = fh;
1673	–	synchronized (f) { f.notifyAll(); };
1674	–	}
1675	–	}
1676	–	if (count != 0) {
1677	–	if (!added)
1678	–	return val;
1679	–	if (tab.length <= 64)
1680	–	count = 2;
1681	–	break;
1682	–	}
1683	–	}
1684	–	}
1685	–	}
1686	–	if (val != null) {
1687	–	counter.add(1L);
1688	–	if (count > 1)
1689	–	checkForResize();
1690	–	}
1691	–	return val;
1692	–	}
1693	–
1694	–	/** Implementation for compute */
1695	–	@SuppressWarnings("unchecked") private final Object internalCompute
1696	–	(K k, boolean onlyIfPresent, BiFun<? super K, ? super V, ? extends V> mf) {
1697	–	int h = spread(k.hashCode());
1698	–	Object val = null;
1699	–	int delta = 0;
1700	–	int count = 0;
1701	–	for (Node[] tab = table;;) {
1702	–	Node f; int i, fh; Object fk;
1703	–	if (tab == null)
1704	–	tab = initTable();
1705	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1706	–	if (onlyIfPresent)
1707	–	break;
1708	–	Node node = new Node(fh = h | LOCKED, k, null, null);
1709	–	if (casTabAt(tab, i, null, node)) {
1710	–	try {
1711	–	count = 1;
1712	–	if ((val = mf.apply(k, null)) != null) {
1713	–	node.val = val;
1714	–	delta = 1;
1715	–	}
1716	–	} finally {
1717	–	if (delta == 0)
1718	–	setTabAt(tab, i, null);
1719	–	if (!node.casHash(fh, h)) {
1720	–	node.hash = h;
1721	–	synchronized (node) { node.notifyAll(); };
1722	–	}
1723	–	}
1724	–	}
1725	–	if (count != 0)
1726	–	break;
1727	–	}
1728	–	else if ((fh = f.hash) == MOVED) {
1729	–	if ((fk = f.key) instanceof TreeBin) {
1730	–	TreeBin t = (TreeBin)fk;
1731	–	t.acquire(0);
1732	–	try {
1733	–	if (tabAt(tab, i) == f) {
1734	–	count = 1;
1735	–	TreeNode p = t.getTreeNode(h, k, t.root);
1736	–	Object pv = (p == null) ? null : p.val;
1737	–	if ((val = mf.apply(k, (V)pv)) != null) {
1738	–	if (p != null)
1739	–	p.val = val;
1740	–	else {
1741	–	count = 2;
1742	–	delta = 1;
1743	–	t.putTreeNode(h, k, val);
1744	–	}
1745	–	}
1746	–	else if (p != null) {
1747	–	delta = -1;
1748	–	t.deleteTreeNode(p);
1749	–	}
1750	–	}
1751	–	} finally {
1752	–	t.release(0);
1753	–	}
1754	–	if (count != 0)
1755	–	break;
1756	–	}
1757	–	else
1758	–	tab = (Node[])fk;
1759	–	}
1760	–	else if ((fh & LOCKED) != 0) {
1761	–	checkForResize();
1762	–	f.tryAwaitLock(tab, i);
1763	–	}
1764	–	else if (f.casHash(fh, fh | LOCKED)) {
1765	–	try {
1766	–	if (tabAt(tab, i) == f) {
1767	–	count = 1;
1768	–	for (Node e = f, pred = null;; ++count) {
1769	–	Object ek, ev;
1770	–	if ((e.hash & HASH_BITS) == h &&
1771	–	(ev = e.val) != null &&
1772	–	((ek = e.key) == k || k.equals(ek))) {
1773	–	val = mf.apply(k, (V)ev);
1774	–	if (val != null)
1775	–	e.val = val;
1776	–	else {
1777	–	delta = -1;
1778	–	Node en = e.next;
1779	–	if (pred != null)
1780	–	pred.next = en;
1781	–	else
1782	–	setTabAt(tab, i, en);
1783	–	}
1784	–	break;
1785	–	}
1786	–	pred = e;
1787	–	if ((e = e.next) == null) {
1788	–	if (!onlyIfPresent && (val = mf.apply(k, null)) != null) {
1789	–	pred.next = new Node(h, k, val, null);
1790	–	delta = 1;
1791	–	if (count >= TREE_THRESHOLD)
1792	–	replaceWithTreeBin(tab, i, k);
1793	–	}
1794	–	break;
1795	–	}
1796	–	}
1797	–	}
1798	–	} finally {
1799	–	if (!f.casHash(fh | LOCKED, fh)) {
1800	–	f.hash = fh;
1801	–	synchronized (f) { f.notifyAll(); };
1802	–	}
1803	–	}
1804	–	if (count != 0) {
1805	–	if (tab.length <= 64)
1806	–	count = 2;
1807	–	break;
1808	–	}
1809	–	}
1810	–	}
1811	–	if (delta != 0) {
1812	–	counter.add((long)delta);
1813	–	if (count > 1)
1814	–	checkForResize();
1815	–	}
1816	–	return val;
1817	–	}
1818	–
1819	–	/** Implementation for merge */
1820	–	@SuppressWarnings("unchecked") private final Object internalMerge
1821	–	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
1822	–	int h = spread(k.hashCode());
1823	–	Object val = null;
1824	–	int delta = 0;
1825	–	int count = 0;
1826	–	for (Node[] tab = table;;) {
1827	–	int i; Node f; int fh; Object fk, fv;
1828	–	if (tab == null)
1829	–	tab = initTable();
1830	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1831	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1832	–	delta = 1;
1833	–	val = v;
1834	–	break;
1835	–	}
1836	–	}
1837	–	else if ((fh = f.hash) == MOVED) {
1838	–	if ((fk = f.key) instanceof TreeBin) {
1839	–	TreeBin t = (TreeBin)fk;
1840	–	t.acquire(0);
1841	–	try {
1842	–	if (tabAt(tab, i) == f) {
1843	–	count = 1;
1844	–	TreeNode p = t.getTreeNode(h, k, t.root);
1845	–	val = (p == null) ? v : mf.apply((V)p.val, v);
1846	–	if (val != null) {
1847	–	if (p != null)
1848	–	p.val = val;
1849	–	else {
1850	–	count = 2;
1851	–	delta = 1;
1852	–	t.putTreeNode(h, k, val);
1853	–	}
1854	–	}
1855	–	else if (p != null) {
1856	–	delta = -1;
1857	–	t.deleteTreeNode(p);
1858	–	}
1859	–	}
1860	–	} finally {
1861	–	t.release(0);
1862	–	}
1863	–	if (count != 0)
1864	–	break;
1865	–	}
1866	–	else
1867	–	tab = (Node[])fk;
1868	–	}
1869	–	else if ((fh & LOCKED) != 0) {
1870	–	checkForResize();
1871	–	f.tryAwaitLock(tab, i);
1872	–	}
1873	–	else if (f.casHash(fh, fh | LOCKED)) {
1874	–	try {
1875	–	if (tabAt(tab, i) == f) {
1876	–	count = 1;
1877	–	for (Node e = f, pred = null;; ++count) {
1878	–	Object ek, ev;
1879	–	if ((e.hash & HASH_BITS) == h &&
1880	–	(ev = e.val) != null &&
1881	–	((ek = e.key) == k || k.equals(ek))) {
1882	–	val = mf.apply(v, (V)ev);
1883	–	if (val != null)
1884	–	e.val = val;
1885	–	else {
1886	–	delta = -1;
1887	–	Node en = e.next;
1888	–	if (pred != null)
1889	–	pred.next = en;
1890	–	else
1891	–	setTabAt(tab, i, en);
1892	–	}
1893	–	break;
1894	–	}
1895	–	pred = e;
1896	–	if ((e = e.next) == null) {
1897	–	val = v;
1898	–	pred.next = new Node(h, k, val, null);
1899	–	delta = 1;
1900	–	if (count >= TREE_THRESHOLD)
1901	–	replaceWithTreeBin(tab, i, k);
1902	–	break;
1903	–	}
1904	–	}
1905	–	}
1906	–	} finally {
1907	–	if (!f.casHash(fh | LOCKED, fh)) {
1908	–	f.hash = fh;
1909	–	synchronized (f) { f.notifyAll(); };
1910	–	}
1911	–	}
1912	–	if (count != 0) {
1913	–	if (tab.length <= 64)
1914	–	count = 2;
1915	–	break;
1916	–	}
1917	–	}
1918	–	}
1919	–	if (delta != 0) {
1920	–	counter.add((long)delta);
1921	–	if (count > 1)
1922	–	checkForResize();
1923	–	}
1924	–	return val;
1925	–	}
1926	–
1927	–	/** Implementation for putAll */
1928	–	private final void internalPutAll(Map<?, ?> m) {
1929	–	tryPresize(m.size());
1930	–	long delta = 0L;     // number of uncommitted additions
1931	–	boolean npe = false; // to throw exception on exit for nulls
1932	–	try {                // to clean up counts on other exceptions
1933	–	for (Map.Entry<?, ?> entry : m.entrySet()) {
1934	–	Object k, v;
1935	–	if (entry == null || (k = entry.getKey()) == null ||
1936	–	(v = entry.getValue()) == null) {
1937	–	npe = true;
1938	–	break;
1939	–	}
1940	–	int h = spread(k.hashCode());
1941	–	for (Node[] tab = table;;) {
1942	–	int i; Node f; int fh; Object fk;
1943	–	if (tab == null)
1944	–	tab = initTable();
1945	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
1946	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1947	–	++delta;
1948	–	break;
1949	–	}
1950	–	}
1951	–	else if ((fh = f.hash) == MOVED) {
1952	–	if ((fk = f.key) instanceof TreeBin) {
1953	–	TreeBin t = (TreeBin)fk;
1954	–	boolean validated = false;
1955	–	t.acquire(0);
1956	–	try {
1957	–	if (tabAt(tab, i) == f) {
1958	–	validated = true;
1959	–	TreeNode p = t.getTreeNode(h, k, t.root);
1960	–	if (p != null)
1961	–	p.val = v;
1962	–	else {
1963	–	t.putTreeNode(h, k, v);
1964	–	++delta;
1965	–	}
1966	–	}
1967	–	} finally {
1968	–	t.release(0);
1969	–	}
1970	–	if (validated)
1971	–	break;
1972	–	}
1973	–	else
1974	–	tab = (Node[])fk;
1975	–	}
1976	–	else if ((fh & LOCKED) != 0) {
1977	–	counter.add(delta);
1978	–	delta = 0L;
1979	–	checkForResize();
1980	–	f.tryAwaitLock(tab, i);
1981	–	}
1982	–	else if (f.casHash(fh, fh | LOCKED)) {
1983	–	int count = 0;
1984	–	try {
1985	–	if (tabAt(tab, i) == f) {
1986	–	count = 1;
1987	–	for (Node e = f;; ++count) {
1988	–	Object ek, ev;
1989	–	if ((e.hash & HASH_BITS) == h &&
1990	–	(ev = e.val) != null &&
1991	–	((ek = e.key) == k || k.equals(ek))) {
1992	–	e.val = v;
1993	–	break;
1994	–	}
1995	–	Node last = e;
1996	–	if ((e = e.next) == null) {
1997	–	++delta;
1998	–	last.next = new Node(h, k, v, null);
1999	–	if (count >= TREE_THRESHOLD)
2000	–	replaceWithTreeBin(tab, i, k);
2001	–	break;
2002	–	}
2003	–	}
2004	–	}
2005	–	} finally {
2006	–	if (!f.casHash(fh | LOCKED, fh)) {
2007	–	f.hash = fh;
2008	–	synchronized (f) { f.notifyAll(); };
2009	–	}
2010	–	}
2011	–	if (count != 0) {
2012	–	if (count > 1) {
2013	–	counter.add(delta);
2014	–	delta = 0L;
2015	–	checkForResize();
2016	–	}
2017	–	break;
2018	–	}
2019	–	}
2020	–	}
2021	–	}
2022	–	} finally {
2023	–	if (delta != 0)
2024	–	counter.add(delta);
2025	–	}
2026	–	if (npe)
2027	–	throw new NullPointerException();
2028	–	}
2029	–
2030	–	/* ---------------- Table Initialization and Resizing -------------- */
2031	–
2032	–	/**
666		* Returns a power of two table size for the given desired capacity.
667		* See Hackers Delight, sec 3.2
668		*/
#	Line 2044 | 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 {
2062	<	sizeCtl = sc;
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		}
2064	–	break;
2065	–	}
2066	–	}
2067	–	return tab;
2068	–	}
2069	–
2070	–	/**
2071	–	* If table is too small and not already resizing, creates next
2072	–	* table and transfers bins.  Rechecks occupancy after a transfer
2073	–	* to see if another resize is already needed because resizings
2074	–	* are lagging additions.
2075	–	*/
2076	–	private final void checkForResize() {
2077	–	Node[] tab; int n, sc;
2078	–	while ((tab = table) != null &&
2079	–	(n = tab.length) < MAXIMUM_CAPACITY &&
2080	–	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
2081	–	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2082	–	try {
2083	–	if (tab == table) {
2084	–	table = rebuild(tab);
2085	–	sc = (n << 1) - (n >>> 1);
2086	–	}
2087	–	} finally {
2088	–	sizeCtl = sc;
697		}
698		}
699	+	return null;
700		}
701
702		/**
703	<	* Tries to presize table to accommodate the given number of elements.
704	<	*
2096	<	* @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;
2102	<	while ((sc = sizeCtl) >= 0) {
2103	<	Node[] tab = table; int n;
2104	<	if (tab == null || (n = tab.length) == 0) {
2105	<	n = (sc > c) ? sc : c;
2106	<	if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2107	<	try {
2108	<	if (table == tab) {
2109	<	table = new Node[n];
2110	<	sc = n - (n >>> 2);
2111	<	}
2112	<	} finally {
2113	<	sizeCtl = sc;
2114	<	}
2115	<	}
2116	<	}
2117	<	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2118	<	break;
2119	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2120	<	try {
2121	<	if (table == tab) {
2122	<	table = rebuild(tab);
2123	<	sc = (n << 1) - (n >>> 1);
2124	<	}
2125	<	} finally {
2126	<	sizeCtl = sc;
2127	<	}
2128	<	}
2129	<	}
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	<	}
2155	<	else {             // transiently use a locked forwarding node
2156	<	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
2157	<	if (!casTabAt(tab, i, f, g))
2158	<	continue;
2159	<	setTabAt(nextTab, i, null);
2160	<	setTabAt(nextTab, i + n, null);
2161	<	setTabAt(tab, i, fwd);
2162	<	if (!g.casHash(MOVED|LOCKED, MOVED)) {
2163	<	g.hash = MOVED;
2164	<	synchronized (g) { g.notifyAll(); }
2165	<	}
2166	<	}
2167	<	}
2168	<	else if ((fh = f.hash) == MOVED) {
2169	<	Object fk = f.key;
2170	<	if (fk instanceof TreeBin) {
2171	<	TreeBin t = (TreeBin)fk;
2172	<	boolean validated = false;
2173	<	t.acquire(0);
2174	<	try {
2175	<	if (tabAt(tab, i) == f) {
2176	<	validated = true;
2177	<	splitTreeBin(nextTab, i, t);
2178	<	setTabAt(tab, i, fwd);
2179	<	}
2180	<	} finally {
2181	<	t.release(0);
2182	<	}
2183	<	if (!validated)
2184	<	continue;
2185	<	}
2186	<	}
2187	<	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
2188	<	boolean validated = false;
2189	<	try {              // split to lo and hi lists; copying as needed
2190	<	if (tabAt(tab, i) == f) {
2191	<	validated = true;
2192	<	splitBin(nextTab, i, f);
2193	<	setTabAt(tab, i, fwd);
2194	<	}
2195	<	} finally {
2196	<	if (!f.casHash(fh | LOCKED, fh)) {
2197	<	f.hash = fh;
2198	<	synchronized (f) { f.notifyAll(); };
2199	<	}
2200	<	}
2201	<	if (!validated)
2202	<	continue;
2203	<	}
2204	<	else {
2205	<	if (buffer == null) // initialize buffer for revisits
2206	<	buffer = new int[TRANSFER_BUFFER_SIZE];
2207	<	if (bin < 0 && bufferIndex > 0) {
2208	<	int j = buffer[--bufferIndex];
2209	<	buffer[bufferIndex] = i;
2210	<	i = j;         // swap with another bin
2211	<	continue;
2212	<	}
2213	<	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
2214	<	f.tryAwaitLock(tab, i);
2215	<	continue;      // no other options -- block
2216	<	}
2217	<	if (rev == null)   // initialize reverse-forwarder
2218	<	rev = new Node(MOVED, tab, null, null);
2219	<	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
2220	<	continue;      // recheck before adding to list
2221	<	buffer[nbuffered++] = i;
2222	<	setTabAt(nextTab, i, rev);     // install place-holders
2223	<	setTabAt(nextTab, i + n, rev);
2224	<	}
2225	<
2226	<	if (bin > 0)
2227	<	i = --bin;
2228	<	else if (buffer != null && nbuffered > 0) {
2229	<	bin = -1;
2230	<	i = buffer[bufferIndex = --nbuffered];
2231	<	}
2232	<	else
2233	<	return nextTab;
2234	<	}
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	<	/**
740	<	* Splits a normal bin with list headed by e into lo and hi parts;
2239	<	* installs in given table.
2240	<	*/
2241	<	private static void splitBin(Node[] nextTab, int i, Node e) {
2242	<	int bit = nextTab.length >>> 1; // bit to split on
2243	<	int runBit = e.hash & bit;
2244	<	Node lastRun = e, lo = null, hi = null;
2245	<	for (Node p = e.next; p != null; p = p.next) {
2246	<	int b = p.hash & bit;
2247	<	if (b != runBit) {
2248	<	runBit = b;
2249	<	lastRun = p;
2250	<	}
2251	<	}
2252	<	if (runBit == 0)
2253	<	lo = lastRun;
2254	<	else
2255	<	hi = lastRun;
2256	<	for (Node p = e; p != lastRun; p = p.next) {
2257	<	int ph = p.hash & HASH_BITS;
2258	<	Object pk = p.key, pv = p.val;
2259	<	if ((ph & bit) == 0)
2260	<	lo = new Node(ph, pk, pv, lo);
2261	<	else
2262	<	hi = new Node(ph, pk, pv, hi);
2263	<	}
2264	<	setTabAt(nextTab, i, lo);
2265	<	setTabAt(nextTab, i + bit, hi);
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 tree bin into lo and hi parts; 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 splitTreeBin(Node[] nextTab, int i, TreeBin t) {
2272	<	int bit = nextTab.length >>> 1;
2273	<	TreeBin lt = new TreeBin();
2274	<	TreeBin ht = new TreeBin();
2275	<	int lc = 0, hc = 0;
2276	<	for (Node e = t.first; e != null; e = e.next) {
2277	<	int h = e.hash & HASH_BITS;
2278	<	Object k = e.key, v = e.val;
2279	<	if ((h & bit) == 0) {
2280	<	++lc;
2281	<	lt.putTreeNode(h, k, v);
2282	<	}
2283	<	else {
2284	<	++hc;
2285	<	ht.putTreeNode(h, k, v);
2286	<	}
2287	<	}
2288	<	Node ln, hn; // throw away trees if too small
2289	<	if (lc <= (TREE_THRESHOLD >>> 1)) {
2290	<	ln = null;
2291	<	for (Node p = lt.first; p != null; p = p.next)
2292	<	ln = new Node(p.hash, p.key, p.val, ln);
2293	<	}
2294	<	else
2295	<	ln = new Node(MOVED, lt, null, null);
2296	<	setTabAt(nextTab, i, ln);
2297	<	if (hc <= (TREE_THRESHOLD >>> 1)) {
2298	<	hn = null;
2299	<	for (Node p = ht.first; p != null; p = p.next)
2300	<	hn = new Node(p.hash, p.key, p.val, hn);
2301	<	}
2302	<	else
2303	<	hn = new Node(MOVED, ht, null, null);
2304	<	setTabAt(nextTab, i + bit, hn);
2305	<	}
749	>	transient volatile Node<K,V>[] table;
750
751		/**
752	<	* Implementation for clear. Steps through each bin, removing all
2309	<	* nodes.
752	>	* The next table to use; non-null only while resizing.
753		*/
754	<	private final void internalClear() {
2312	<	long delta = 0L; // negative number of deletions
2313	<	int i = 0;
2314	<	Node[] tab = table;
2315	<	while (tab != null && i < tab.length) {
2316	<	int fh; Object fk;
2317	<	Node f = tabAt(tab, i);
2318	<	if (f == null)
2319	<	++i;
2320	<	else if ((fh = f.hash) == MOVED) {
2321	<	if ((fk = f.key) instanceof TreeBin) {
2322	<	TreeBin t = (TreeBin)fk;
2323	<	t.acquire(0);
2324	<	try {
2325	<	if (tabAt(tab, i) == f) {
2326	<	for (Node p = t.first; p != null; p = p.next) {
2327	<	if (p.val != null) { // (currently always true)
2328	<	p.val = null;
2329	<	--delta;
2330	<	}
2331	<	}
2332	<	t.first = null;
2333	<	t.root = null;
2334	<	++i;
2335	<	}
2336	<	} finally {
2337	<	t.release(0);
2338	<	}
2339	<	}
2340	<	else
2341	<	tab = (Node[])fk;
2342	<	}
2343	<	else if ((fh & LOCKED) != 0) {
2344	<	counter.add(delta); // opportunistically update count
2345	<	delta = 0L;
2346	<	f.tryAwaitLock(tab, i);
2347	<	}
2348	<	else if (f.casHash(fh, fh | LOCKED)) {
2349	<	try {
2350	<	if (tabAt(tab, i) == f) {
2351	<	for (Node e = f; e != null; e = e.next) {
2352	<	if (e.val != null) {  // (currently always true)
2353	<	e.val = null;
2354	<	--delta;
2355	<	}
2356	<	}
2357	<	setTabAt(tab, i, null);
2358	<	++i;
2359	<	}
2360	<	} finally {
2361	<	if (!f.casHash(fh | LOCKED, fh)) {
2362	<	f.hash = fh;
2363	<	synchronized (f) { f.notifyAll(); };
2364	<	}
2365	<	}
2366	<	}
2367	<	}
2368	<	if (delta != 0)
2369	<	counter.add(delta);
2370	<	}
2371	<
2372	<	/* ----------------Table Traversal -------------- */
754	>	private transient volatile Node<K,V>[] nextTable;
755
756		/**
757	<	* Encapsulates traversal for methods such as containsValue; also
758	<	* serves as a base class for other iterators and bulk tasks.
759	<	*
760	<	* At each step, the iterator snapshots the key ("nextKey") and
761	<	* value ("nextVal") of a valid node (i.e., one that, at point of
2380	<	* snapshot, has a non-null user value). Because val fields can
2381	<	* change (including to null, indicating deletion), field nextVal
2382	<	* might not be accurate at point of use, but still maintains the
2383	<	* weak consistency property of holding a value that was once
2384	<	* valid. To support iterator.remove, the nextKey field is not
2385	<	* updated (nulled out) when the iterator cannot advance.
2386	<	*
2387	<	* Internal traversals directly access these fields, as in:
2388	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2389	<	*
2390	<	* Exported iterators must track whether the iterator has advanced
2391	<	* (in hasNext vs next) (by setting/checking/nulling field
2392	<	* nextVal), and then extract key, value, or key-value pairs as
2393	<	* return values of next().
2394	<	*
2395	<	* The iterator visits once each still-valid node that was
2396	<	* reachable upon iterator construction. It might miss some that
2397	<	* were added to a bin after the bin was visited, which is OK wrt
2398	<	* consistency guarantees. Maintaining this property in the face
2399	<	* of possible ongoing resizes requires a fair amount of
2400	<	* bookkeeping state that is difficult to optimize away amidst
2401	<	* volatile accesses.  Even so, traversal maintains reasonable
2402	<	* throughput.
2403	<	*
2404	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2405	<	* However, if the table has been resized, then all future steps
2406	<	* must traverse both the bin at the current index as well as at
2407	<	* (index + baseSize); and so on for further resizings. To
2408	<	* paranoically cope with potential sharing by users of iterators
2409	<	* across threads, iteration terminates if a bounds checks fails
2410	<	* for a table read.
2411	<	*
2412	<	* This class extends CountedCompleter to streamline parallel
2413	<	* iteration in bulk operations. This adds only a few fields of
2414	<	* space overhead, which is small enough in cases where it is not
2415	<	* needed to not worry about it.  Because CountedCompleter is
2416	<	* Serializable, but iterators need not be, we need to add warning
2417	<	* suppressions.
2418	<	*/
2419	<	@SuppressWarnings("serial") static class Traverser<K,V,R> extends CountedCompleter<R> {
2420	<	final ConcurrentHashMapV8<K, V> map;
2421	<	Node next;           // the next entry to use
2422	<	Object nextKey;      // cached key field of next
2423	<	Object nextVal;      // cached val field of next
2424	<	Node[] tab;          // current table; updated if resized
2425	<	int index;           // index of bin to use next
2426	<	int baseIndex;       // current index of initial table
2427	<	int baseLimit;       // index bound for initial table
2428	<	int baseSize;        // initial table size
2429	<	int batch;           // split control
2430	<
2431	<	/** Creates iterator for all entries in the table. */
2432	<	Traverser(ConcurrentHashMapV8<K, V> map) {
2433	<	this.map = map;
2434	<	}
2435	<
2436	<	/** Creates iterator for split() methods and task constructors */
2437	<	Traverser(ConcurrentHashMapV8<K,V> map, Traverser<K,V,?> it, int batch) {
2438	<	super(it);
2439	<	this.batch = batch;
2440	<	if ((this.map = map) != null && it != null) { // split parent
2441	<	Node[] t;
2442	<	if ((t = it.tab) == null &&
2443	<	(t = it.tab = map.table) != null)
2444	<	it.baseLimit = it.baseSize = t.length;
2445	<	this.tab = t;
2446	<	this.baseSize = it.baseSize;
2447	<	int hi = this.baseLimit = it.baseLimit;
2448	<	it.baseLimit = this.index = this.baseIndex =
2449	<	(hi + it.baseIndex + 1) >>> 1;
2450	<	}
2451	<	}
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 transient volatile long baseCount;
762
763	<	/**
764	<	* Advances next; returns nextVal or null if terminated.
765	<	* See above for explanation.
766	<	*/
767	<	final Object advance() {
768	<	Node e = next;
769	<	Object ev = null;
770	<	outer: do {
771	<	if (e != null)                  // advance past used/skipped node
2462	<	e = e.next;
2463	<	while (e == null) {             // get to next non-null bin
2464	<	ConcurrentHashMapV8<K, V> m;
2465	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2466	<	if ((t = tab) != null)
2467	<	n = t.length;
2468	<	else if ((m = map) != null && (t = tab = m.table) != null)
2469	<	n = baseLimit = baseSize = t.length;
2470	<	else
2471	<	break outer;
2472	<	if ((b = baseIndex) >= baseLimit ||
2473	<	(i = index) < 0 || i >= n)
2474	<	break outer;
2475	<	if ((e = tabAt(t, i)) != null && e.hash == MOVED) {
2476	<	if ((ek = e.key) instanceof TreeBin)
2477	<	e = ((TreeBin)ek).first;
2478	<	else {
2479	<	tab = (Node[])ek;
2480	<	continue;           // restarts due to null val
2481	<	}
2482	<	}                           // visit upper slots if present
2483	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2484	<	}
2485	<	nextKey = e.key;
2486	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2487	<	next = e;
2488	<	return nextVal = ev;
2489	<	}
763	>	/**
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	<	public final void remove() {
774	<	Object k = nextKey;
775	<	if (k == null && (advance() == null || (k = nextKey) == null))
776	<	throw new IllegalStateException();
2495	<	map.internalReplace(k, null, null);
2496	<	}
773	>	/**
774	>	* The next table index (plus one) to split while resizing.
775	>	*/
776	>	private transient volatile int transferIndex;
777
778	<	public final boolean hasNext() {
779	<	return nextVal != null || advance() != null;
780	<	}
778	>	/**
779	>	* The least available table index to split while resizing.
780	>	*/
781	>	private transient volatile int transferOrigin;
782
783	<	public final boolean hasMoreElements() { return hasNext(); }
783	>	/**
784	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
785	>	*/
786	>	private transient volatile int cellsBusy;
787
788	<	public void compute() { } // default no-op CountedCompleter body
788	>	/**
789	>	* Table of counter cells. When non-null, size is a power of 2.
790	>	*/
791	>	private transient volatile CounterCell[] counterCells;
792
793	<	/**
794	<	* Returns a batch value > 0 if this task should (and must) be
795	<	* split, if so, adding to pending count, and in any case
796	<	* updating batch value. The initial batch value is approx
2510	<	* exp2 of the number of times (minus one) to split task by
2511	<	* two before executing leaf action. This value is faster to
2512	<	* compute and more convenient to use as a guide to splitting
2513	<	* than is the depth, since it is used while dividing by two
2514	<	* anyway.
2515	<	*/
2516	<	final int preSplit() {
2517	<	ConcurrentHashMapV8<K, V> m; int b; Node[] t;  ForkJoinPool pool;
2518	<	if ((b = batch) < 0 && (m = map) != null) { // force initialization
2519	<	if ((t = tab) == null && (t = tab = m.table) != null)
2520	<	baseLimit = baseSize = t.length;
2521	<	if (t != null) {
2522	<	long n = m.counter.sum();
2523	<	int par = ((pool = getPool()) == null) ?
2524	<	ForkJoinPool.getCommonPoolParallelism() :
2525	<	pool.getParallelism();
2526	<	int sp = par << 3; // slack of 8
2527	<	b = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
2528	<	}
2529	<	}
2530	<	b = (b <= 1 || baseIndex == baseLimit) ? 0 : (b >>> 1);
2531	<	if ((batch = b) > 0)
2532	<	addToPendingCount(1);
2533	<	return b;
2534	<	}
793	>	// views
794	>	private transient KeySetView<K,V> keySet;
795	>	private transient ValuesView<K,V> values;
796	>	private transient EntrySetView<K,V> entrySet;
797
2536	–	}
798
799		/* ---------------- Public operations -------------- */
800
#	Line 2541 | Line 802 | public class ConcurrentHashMapV8<K, V>
802		* Creates a new, empty map with the default initial table size (16).
803		*/
804		public ConcurrentHashMapV8() {
2544	–	this.counter = new LongAdder();
805		}
806
807		/**
#	Line 2560 | Line 820 | public class ConcurrentHashMapV8<K, V>
820		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
821		MAXIMUM_CAPACITY :
822		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2563	–	this.counter = new LongAdder();
823		this.sizeCtl = cap;
824		}
825
#	Line 2570 | Line 829 | public class ConcurrentHashMapV8<K, V>
829		* @param m the map
830		*/
831		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2573	–	this.counter = new LongAdder();
832		this.sizeCtl = DEFAULT_CAPACITY;
833	<	internalPutAll(m);
833	>	putAll(m);
834		}
835
836		/**
#	Line 2613 | 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 2621 | 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);
2624	–	this.counter = new LongAdder();
882		this.sizeCtl = cap;
883		}
884
885	<	/**
2629	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2630	<	* from the given type to {@code Boolean.TRUE}.
2631	<	*
2632	<	* @return the new set
2633	<	*/
2634	<	public static <K> KeySetView<K,Boolean> newKeySet() {
2635	<	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(),
2636	<	Boolean.TRUE);
2637	<	}
2638	<
2639	<	/**
2640	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2641	<	* from the given type to {@code Boolean.TRUE}.
2642	<	*
2643	<	* @param initialCapacity The implementation performs internal
2644	<	* sizing to accommodate this many elements.
2645	<	* @throws IllegalArgumentException if the initial capacity of
2646	<	* elements is negative
2647	<	* @return the new set
2648	<	*/
2649	<	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2650	<	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(initialCapacity),
2651	<	Boolean.TRUE);
2652	<	}
2653	<
2654	<	/**
2655	<	* {@inheritDoc}
2656	<	*/
2657	<	public boolean isEmpty() {
2658	<	return counter.sum() <= 0L; // ignore transient negative values
2659	<	}
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
2673	<	* instead of {@link #size} because a ConcurrentHashMapV8 may
2674	<	* contain more mappings than can be represented as an int. The
2675	<	* value returned is an estimate; the actual count may differ if
2676	<	* there are concurrent insertions or removals.
2677	<	*
2678	<	* @return the number of mappings
898	>	* {@inheritDoc}
899		*/
900	<	public long mappingCount() {
901	<	long n = counter.sum();
2682	<	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 2693 | 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)
2714	<	throw new NullPointerException();
2715	<	V v = (V) internalGet(key);
2716	<	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)
2730	<	throw new NullPointerException();
2731	<	return internalGet(key) != null;
945	>	return get(key) != null;
946		}
947
948		/**
#	Line 2744 | 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		/**
2757	–	* Legacy method testing if some key maps into the specified value
2758	–	* in this table.  This method is identical in functionality to
2759	–	* {@link #containsValue}, and exists solely to ensure
2760	–	* full compatibility with class {@link java.util.Hashtable},
2761	–	* which supported this method prior to introduction of the
2762	–	* Java Collections framework.
2763	–	*
2764	–	* @param  value a value to search for
2765	–	* @return {@code true} if and only if some key maps to the
2766	–	*         {@code value} argument in this table as
2767	–	*         determined by the {@code equals} method;
2768	–	*         {@code false} otherwise
2769	–	* @throws NullPointerException if the specified value is null
2770	–	*/
2771	–	public boolean contains(Object value) {
2772	–	return containsValue(value);
2773	–	}
2774	–
2775	–	/**
974		* Maps the specified key to the specified value in this table.
975		* Neither the key nor the value can be null.
976		*
#	Line 2785 | 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 2798 | 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)
2827	<	*   map.put(key, value);
2828	<	* return value;}</pre>
2829	<	*
2830	<	* except that the action is performed atomically.  If the
2831	<	* function returns {@code null} no mapping is recorded. If the
2832	<	* function itself throws an (unchecked) exception, the exception
2833	<	* is rethrown to its caller, and no mapping is recorded.  Some
2834	<	* attempted update operations on this map by other threads may be
2835	<	* blocked while computation is in progress, so the computation
2836	<	* should be short and simple, and must not attempt to update any
2837	<	* other mappings of this Map. The most appropriate usage is to
2838	<	* construct a new object serving as an initial mapped value, or
2839	<	* memoized result, as in:
2840	<	*
2841	<	*  <pre> {@code
2842	<	* map.computeIfAbsent(key, new Fun<K, V>() {
2843	<	*   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 2854 | 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
2858	<	(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);
2872	<	*     else
2873	<	*       map.remove(key);
2874	<	*   }
2875	<	* }</pre>
2876	<	*
2877	<	* except that the action is performed atomically.  If the
2878	<	* function returns {@code null}, the mapping is removed.  If the
2879	<	* function itself throws an (unchecked) exception, the exception
2880	<	* is rethrown to its caller, and the current mapping is left
2881	<	* unchanged.  Some attempted update operations on this map by
2882	<	* other threads may be blocked while computation is in progress,
2883	<	* so the computation should be short and simple, and must not
2884	<	* attempt to update any other mappings of this Map. For example,
2885	<	* 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 2895 | 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
2899	<	(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);
2913	<	*   else
2914	<	*     map.remove(key);
2915	<	* }</pre>
2916	<	*
2917	<	* except that the action is performed atomically.  If the
2918	<	* function returns {@code null}, the mapping is removed.  If the
2919	<	* function itself throws an (unchecked) exception, the exception
2920	<	* is rethrown to its caller, and the current mapping is left
2921	<	* unchanged.  Some attempted update operations on this map by
2922	<	* other threads may be blocked while computation is in progress,
2923	<	* so the computation should be short and simple, and must not
2924	<	* attempt to update any other mappings of this Map. For example,
2925	<	* to either create or append new messages to a value mapping:
2926	<	*
2927	<	* <pre> {@code
2928	<	* Map<Key, String> map = ...;
2929	<	* final String msg = ...;
2930	<	* map.compute(key, new BiFun<Key, String, String>() {
2931	<	*   public String apply(Key k, String v) {
2932	<	*    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 2942 | 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
2971	<	* is rethrown to its caller, and the current mapping is left
2972	<	* unchanged.  Some attempted update operations on this map by
2973	<	* other threads may be blocked while computation is in progress,
2974	<	* so the computation should be short and simple, and must not
2975	<	* 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
2978	<	(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)
2995	<	throw new NullPointerException();
2996	<	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)
3008	<	return false;
3009	<	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
3028	<	* @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();
3033	<	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
3046	<	* 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
3063	<	* 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 3070 | 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.
3075	<	* The collection is backed by the map, so changes to the map are
3076	<	* 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.
3085	<	* The set is backed by the map, so changes to the map are
3086	<	* reflected in the set, and vice-versa.  The set supports element
3087	<	* removal, which removes the corresponding mapping from the map,
3088	<	* via the {@code Iterator.remove}, {@code Set.remove},
3089	<	* {@code removeAll}, {@code retainAll}, and {@code clear}
3090	<	* operations.  It does not support the {@code add} or
3091	<	* {@code addAll} operations.
3092	<	*
3093	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
3094	<	* that will never throw {@link ConcurrentModificationException},
3095	<	* and guarantees to traverse elements as they existed upon
3096	<	* construction of the iterator, and may (but is not guaranteed to)
3097	<	* 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.
3106	<	*
3107	<	* @return an enumeration of the keys in this table
3108	<	* @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	<	*
3136	<	* @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	<	*
3145	<	* @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.,
3153	<	* the sum of, for each key-value pair in the map,
3154	<	* {@code key.hashCode() ^ value.hashCode()}.
3155	<	*
3156	<	* @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
3170	<	* representation consists of a list of key-value mappings (in no
3171	<	* particular order) enclosed in braces ("{@code {}}").  Adjacent
3172	<	* mappings are separated by the characters {@code ", "} (comma
3173	<	* and space).  Each key-value mapping is rendered as the key
3174	<	* followed by an equals sign ("{@code =}") followed by the
3175	<	* associated value.
3176	<	*
3177	<	* @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 comparisons 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	>	/**
3039	>	* Recursive invariant check
3040	>	*/
3041	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3042	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3043	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3044	>	if (tb != null && tb.next != t)
3045	>	return false;
3046	>	if (tn != null && tn.prev != t)
3047	>	return false;
3048	>	if (tp != null && t != tp.left && t != tp.right)
3049	>	return false;
3050	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3051	>	return false;
3052	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3053	>	return false;
3054	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3055	>	return false;
3056	>	if (tl != null && !checkInvariants(tl))
3057	>	return false;
3058	>	if (tr != null && !checkInvariants(tr))
3059	>	return false;
3060	>	return true;
3061	>	}
3062	>
3063	>	private static final sun.misc.Unsafe U;
3064	>	private static final long LOCKSTATE;
3065	>	static {
3066	>	try {
3067	>	U = getUnsafe();
3068	>	Class<?> k = TreeBin.class;
3069	>	LOCKSTATE = U.objectFieldOffset
3070	>	(k.getDeclaredField("lockState"));
3071	>	} catch (Exception e) {
3072	>	throw new Error(e);
3073		}
3074		}
3195	–	return sb.append('}').toString();
3075		}
3076
3077	+	/* ----------------Table Traversal -------------- */
3078	+
3079		/**
3080	<	* Compares the specified object with this map for equality.
3081	<	* Returns {@code true} if the given object is a map with the same
3201	<	* mappings as this map.  This operation may return misleading
3202	<	* results if either map is concurrently modified during execution
3203	<	* of this method.
3080	>	* Encapsulates traversal for methods such as containsValue; also
3081	>	* serves as a base class for other iterators and spliterators.
3082		*
3083	<	* @param o object to be compared for equality with this map
3084	<	* @return {@code true} if the specified object is equal to this map
3083	>	* Method advance visits once each still-valid node that was
3084	>	* reachable upon iterator construction. It might miss some that
3085	>	* were added to a bin after the bin was visited, which is OK wrt
3086	>	* consistency guarantees. Maintaining this property in the face
3087	>	* of possible ongoing resizes requires a fair amount of
3088	>	* bookkeeping state that is difficult to optimize away amidst
3089	>	* volatile accesses.  Even so, traversal maintains reasonable
3090	>	* throughput.
3091	>	*
3092	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3093	>	* However, if the table has been resized, then all future steps
3094	>	* must traverse both the bin at the current index as well as at
3095	>	* (index + baseSize); and so on for further resizings. To
3096	>	* paranoically cope with potential sharing by users of iterators
3097	>	* across threads, iteration terminates if a bounds checks fails
3098	>	* for a table read.
3099		*/
3100	<	public boolean equals(Object o) {
3101	<	if (o != this) {
3102	<	if (!(o instanceof Map))
3103	<	return false;
3104	<	Map<?,?> m = (Map<?,?>) o;
3105	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3106	<	Object val;
3107	<	while ((val = it.advance()) != null) {
3108	<	Object v = m.get(it.nextKey);
3109	<	if (v == null || (v != val && !v.equals(val)))
3110	<	return false;
3111	<	}
3112	<	for (Map.Entry<?,?> e : m.entrySet()) {
3113	<	Object mk, mv, v;
3114	<	if ((mk = e.getKey()) == null ||
3115	<	(mv = e.getValue()) == null ||
3116	<	(v = internalGet(mk)) == null ||
3117	<	(mv != v && !mv.equals(v)))
3118	<	return false;
3100	>	static class Traverser<K,V> {
3101	>	Node<K,V>[] tab;        // current table; updated if resized
3102	>	Node<K,V> next;         // the next entry to use
3103	>	int index;              // index of bin to use next
3104	>	int baseIndex;          // current index of initial table
3105	>	int baseLimit;          // index bound for initial table
3106	>	final int baseSize;     // initial table size
3107	>
3108	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3109	>	this.tab = tab;
3110	>	this.baseSize = size;
3111	>	this.baseIndex = this.index = index;
3112	>	this.baseLimit = limit;
3113	>	this.next = null;
3114	>	}
3115	>
3116	>	/**
3117	>	* Advances if possible, returning next valid node, or null if none.
3118	>	*/
3119	>	final Node<K,V> advance() {
3120	>	Node<K,V> e;
3121	>	if ((e = next) != null)
3122	>	e = e.next;
3123	>	for (;;) {
3124	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
3125	>	if (e != null)
3126	>	return next = e;
3127	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3128	>	(n = t.length) <= (i = index) || i < 0)
3129	>	return next = null;
3130	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
3131	>	if (e instanceof ForwardingNode) {
3132	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3133	>	e = null;
3134	>	continue;
3135	>	}
3136	>	else if (e instanceof TreeBin)
3137	>	e = ((TreeBin<K,V>)e).first;
3138	>	else
3139	>	e = null;
3140	>	}
3141	>	if ((index += baseSize) >= n)
3142	>	index = ++baseIndex;    // visit upper slots if present
3143		}
3144		}
3229	–	return true;
3145		}
3146
3147	<	/* ----------------Iterators -------------- */
3148	<
3149	<	@SuppressWarnings("serial") static final class KeyIterator<K,V> extends Traverser<K,V,Object>
3150	<	implements Spliterator<K>, Enumeration<K> {
3151	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3152	<	KeyIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3153	<	super(map, it, -1);
3147	>	/**
3148	>	* Base of key, value, and entry Iterators. Adds fields to
3149	>	* Traverser to support iterator.remove.
3150	>	*/
3151	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3152	>	final ConcurrentHashMapV8<K,V> map;
3153	>	Node<K,V> lastReturned;
3154	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3155	>	ConcurrentHashMapV8<K,V> map) {
3156	>	super(tab, size, index, limit);
3157	>	this.map = map;
3158	>	advance();
3159		}
3160	<	public KeyIterator<K,V> split() {
3161	<	if (nextKey != null)
3160	>
3161	>	public final boolean hasNext() { return next != null; }
3162	>	public final boolean hasMoreElements() { return next != null; }
3163	>
3164	>	public final void remove() {
3165	>	Node<K,V> p;
3166	>	if ((p = lastReturned) == null)
3167		throw new IllegalStateException();
3168	<	return new KeyIterator<K,V>(map, this);
3168	>	lastReturned = null;
3169	>	map.replaceNode(p.key, null, null);
3170		}
3171	<	@SuppressWarnings("unchecked") public final K next() {
3172	<	if (nextVal == null && advance() == null)
3171	>	}
3172	>
3173	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3174	>	implements Iterator<K>, Enumeration<K> {
3175	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3176	>	ConcurrentHashMapV8<K,V> map) {
3177	>	super(tab, index, size, limit, map);
3178	>	}
3179	>
3180	>	public final K next() {
3181	>	Node<K,V> p;
3182	>	if ((p = next) == null)
3183		throw new NoSuchElementException();
3184	<	Object k = nextKey;
3185	<	nextVal = null;
3186	<	return (K) k;
3184	>	K k = p.key;
3185	>	lastReturned = p;
3186	>	advance();
3187	>	return k;
3188		}
3189
3190		public final K nextElement() { return next(); }
3191		}
3192
3193	<	@SuppressWarnings("serial") static final class ValueIterator<K,V> extends Traverser<K,V,Object>
3194	<	implements Spliterator<V>, Enumeration<V> {
3195	<	ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3196	<	ValueIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3197	<	super(map, it, -1);
3261	<	}
3262	<	public ValueIterator<K,V> split() {
3263	<	if (nextKey != null)
3264	<	throw new IllegalStateException();
3265	<	return new ValueIterator<K,V>(map, this);
3193	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3194	>	implements Iterator<V>, Enumeration<V> {
3195	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3196	>	ConcurrentHashMapV8<K,V> map) {
3197	>	super(tab, index, size, limit, map);
3198		}
3199
3200	<	@SuppressWarnings("unchecked") public final V next() {
3201	<	Object v;
3202	<	if ((v = nextVal) == null && (v = advance()) == null)
3200	>	public final V next() {
3201	>	Node<K,V> p;
3202	>	if ((p = next) == null)
3203		throw new NoSuchElementException();
3204	<	nextVal = null;
3205	<	return (V) v;
3204	>	V v = p.val;
3205	>	lastReturned = p;
3206	>	advance();
3207	>	return v;
3208		}
3209
3210		public final V nextElement() { return next(); }
3211		}
3212
3213	<	@SuppressWarnings("serial") static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3214	<	implements Spliterator<Map.Entry<K,V>> {
3215	<	EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3216	<	EntryIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3217	<	super(map, it, -1);
3284	<	}
3285	<	public EntryIterator<K,V> split() {
3286	<	if (nextKey != null)
3287	<	throw new IllegalStateException();
3288	<	return new EntryIterator<K,V>(map, this);
3213	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3214	>	implements Iterator<Map.Entry<K,V>> {
3215	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3216	>	ConcurrentHashMapV8<K,V> map) {
3217	>	super(tab, index, size, limit, map);
3218		}
3219
3220	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3221	<	Object v;
3222	<	if ((v = nextVal) == null && (v = advance()) == null)
3220	>	public final Map.Entry<K,V> next() {
3221	>	Node<K,V> p;
3222	>	if ((p = next) == null)
3223		throw new NoSuchElementException();
3224	<	Object k = nextKey;
3225	<	nextVal = null;
3226	<	return new MapEntry<K,V>((K)k, (V)v, map);
3224	>	K k = p.key;
3225	>	V v = p.val;
3226	>	lastReturned = p;
3227	>	advance();
3228	>	return new MapEntry<K,V>(k, v, map);
3229		}
3230		}
3231
3232		/**
3233	<	* Exported Entry for iterators
3233	>	* Exported Entry for EntryIterator
3234		*/
3235	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3235	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3236		final K key; // non-null
3237		V val;       // non-null
3238	<	final ConcurrentHashMapV8<K, V> map;
3239	<	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3238	>	final ConcurrentHashMapV8<K,V> map;
3239	>	MapEntry(K key, V val, ConcurrentHashMapV8<K,V> map) {
3240		this.key = key;
3241		this.val = val;
3242		this.map = map;
3243		}
3244	<	public final K getKey()       { return key; }
3245	<	public final V getValue()     { return val; }
3246	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3247	<	public final String toString(){ return key + "=" + val; }
3244	>	public K getKey()        { return key; }
3245	>	public V getValue()      { return val; }
3246	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3247	>	public String toString() { return key + "=" + val; }
3248
3249	<	public final boolean equals(Object o) {
3249	>	public boolean equals(Object o) {
3250		Object k, v; Map.Entry<?,?> e;
3251		return ((o instanceof Map.Entry) &&
3252		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3329 | Line 3260 | public class ConcurrentHashMapV8<K, V>
3260		* value to return is somewhat arbitrary here. Since we do not
3261		* necessarily track asynchronous changes, the most recent
3262		* "previous" value could be different from what we return (or
3263	<	* could even have been removed in which case the put will
3263	>	* could even have been removed, in which case the put will
3264		* re-establish). We do not and cannot guarantee more.
3265		*/
3266	<	public final V setValue(V value) {
3266	>	public V setValue(V value) {
3267		if (value == null) throw new NullPointerException();
3268		V v = val;
3269		val = value;
#	Line 3341 | Line 3272 | public class ConcurrentHashMapV8<K, V>
3272		}
3273		}
3274
3275	<	/**
3276	<	* Returns exportable snapshot entry for the given key and value
3277	<	* when write-through can't or shouldn't be used.
3278	<	*/
3279	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
3280	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
3281	<	}
3275	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3276	>	implements ConcurrentHashMapSpliterator<K> {
3277	>	long est;               // size estimate
3278	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3279	>	long est) {
3280	>	super(tab, size, index, limit);
3281	>	this.est = est;
3282	>	}
3283	>
3284	>	public ConcurrentHashMapSpliterator<K> trySplit() {
3285	>	int i, f, h;
3286	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3287	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3288	>	f, est >>>= 1);
3289	>	}
3290
3291	<	/* ---------------- Serialization Support -------------- */
3291	>	public void forEachRemaining(Action<? super K> action) {
3292	>	if (action == null) throw new NullPointerException();
3293	>	for (Node<K,V> p; (p = advance()) != null;)
3294	>	action.apply(p.key);
3295	>	}
3296	>
3297	>	public boolean tryAdvance(Action<? super K> action) {
3298	>	if (action == null) throw new NullPointerException();
3299	>	Node<K,V> p;
3300	>	if ((p = advance()) == null)
3301	>	return false;
3302	>	action.apply(p.key);
3303	>	return true;
3304	>	}
3305	>
3306	>	public long estimateSize() { return est; }
3307
3354	–	/**
3355	–	* Stripped-down version of helper class used in previous version,
3356	–	* declared for the sake of serialization compatibility
3357	–	*/
3358	–	static class Segment<K,V> implements Serializable {
3359	–	private static final long serialVersionUID = 2249069246763182397L;
3360	–	final float loadFactor;
3361	–	Segment(float lf) { this.loadFactor = lf; }
3308		}
3309
3310	<	/**
3311	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
3312	<	* stream (i.e., serializes it).
3313	<	* @param s the stream
3314	<	* @serialData
3315	<	* the key (Object) and value (Object)
3316	<	* for each key-value mapping, followed by a null pair.
3371	<	* The key-value mappings are emitted in no particular order.
3372	<	*/
3373	<	@SuppressWarnings("unchecked") private void writeObject(java.io.ObjectOutputStream s)
3374	<	throws java.io.IOException {
3375	<	if (segments == null) { // for serialization compatibility
3376	<	segments = (Segment<K,V>[])
3377	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
3378	<	for (int i = 0; i < segments.length; ++i)
3379	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
3380	<	}
3381	<	s.defaultWriteObject();
3382	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3383	<	Object v;
3384	<	while ((v = it.advance()) != null) {
3385	<	s.writeObject(it.nextKey);
3386	<	s.writeObject(v);
3310	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3311	>	implements ConcurrentHashMapSpliterator<V> {
3312	>	long est;               // size estimate
3313	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3314	>	long est) {
3315	>	super(tab, size, index, limit);
3316	>	this.est = est;
3317		}
3388	–	s.writeObject(null);
3389	–	s.writeObject(null);
3390	–	segments = null; // throw away
3391	–	}
3318
3319	<	/**
3320	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3321	<	* @param s the stream
3322	<	*/
3323	<	@SuppressWarnings("unchecked") private void readObject(java.io.ObjectInputStream s)
3324	<	throws java.io.IOException, ClassNotFoundException {
3399	<	s.defaultReadObject();
3400	<	this.segments = null; // unneeded
3401	<	// initialize transient final field
3402	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
3319	>	public ConcurrentHashMapSpliterator<V> trySplit() {
3320	>	int i, f, h;
3321	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3322	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3323	>	f, est >>>= 1);
3324	>	}
3325
3326	<	// Create all nodes, then place in table once size is known
3327	<	long size = 0L;
3328	<	Node p = null;
3329	<	for (;;) {
3408	<	K k = (K) s.readObject();
3409	<	V v = (V) s.readObject();
3410	<	if (k != null && v != null) {
3411	<	int h = spread(k.hashCode());
3412	<	p = new Node(h, k, v, p);
3413	<	++size;
3414	<	}
3415	<	else
3416	<	break;
3326	>	public void forEachRemaining(Action<? super V> action) {
3327	>	if (action == null) throw new NullPointerException();
3328	>	for (Node<K,V> p; (p = advance()) != null;)
3329	>	action.apply(p.val);
3330		}
3331	<	if (p != null) {
3332	<	boolean init = false;
3333	<	int n;
3334	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3335	<	n = MAXIMUM_CAPACITY;
3336	<	else {
3337	<	int sz = (int)size;
3338	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
3426	<	}
3427	<	int sc = sizeCtl;
3428	<	boolean collide = false;
3429	<	if (n > sc &&
3430	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
3431	<	try {
3432	<	if (table == null) {
3433	<	init = true;
3434	<	Node[] tab = new Node[n];
3435	<	int mask = n - 1;
3436	<	while (p != null) {
3437	<	int j = p.hash & mask;
3438	<	Node next = p.next;
3439	<	Node q = p.next = tabAt(tab, j);
3440	<	setTabAt(tab, j, p);
3441	<	if (!collide && q != null && q.hash == p.hash)
3442	<	collide = true;
3443	<	p = next;
3444	<	}
3445	<	table = tab;
3446	<	counter.add(size);
3447	<	sc = n - (n >>> 2);
3448	<	}
3449	<	} finally {
3450	<	sizeCtl = sc;
3451	<	}
3452	<	if (collide) { // rescan and convert to TreeBins
3453	<	Node[] tab = table;
3454	<	for (int i = 0; i < tab.length; ++i) {
3455	<	int c = 0;
3456	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
3457	<	if (++c > TREE_THRESHOLD &&
3458	<	(e.key instanceof Comparable)) {
3459	<	replaceWithTreeBin(tab, i, e.key);
3460	<	break;
3461	<	}
3462	<	}
3463	<	}
3464	<	}
3465	<	}
3466	<	if (!init) { // Can only happen if unsafely published.
3467	<	while (p != null) {
3468	<	internalPut(p.key, p.val);
3469	<	p = p.next;
3470	<	}
3471	<	}
3331	>
3332	>	public boolean tryAdvance(Action<? super V> action) {
3333	>	if (action == null) throw new NullPointerException();
3334	>	Node<K,V> p;
3335	>	if ((p = advance()) == null)
3336	>	return false;
3337	>	action.apply(p.val);
3338	>	return true;
3339		}
3340	+
3341	+	public long estimateSize() { return est; }
3342	+
3343		}
3344
3345	+	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3346	+	implements ConcurrentHashMapSpliterator<Map.Entry<K,V>> {
3347	+	final ConcurrentHashMapV8<K,V> map; // To export MapEntry
3348	+	long est;               // size estimate
3349	+	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3350	+	long est, ConcurrentHashMapV8<K,V> map) {
3351	+	super(tab, size, index, limit);
3352	+	this.map = map;
3353	+	this.est = est;
3354	+	}
3355
3356	<	// -------------------------------------------------------
3356	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> trySplit() {
3357	>	int i, f, h;
3358	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3359	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3360	>	f, est >>>= 1, map);
3361	>	}
3362
3363	<	// Sams
3364	<	/** Interface describing a void action of one argument */
3365	<	public interface Action<A> { void apply(A a); }
3366	<	/** Interface describing a void action of two arguments */
3367	<	public interface BiAction<A,B> { void apply(A a, B b); }
3483	<	/** Interface describing a function of one argument */
3484	<	public interface Fun<A,T> { T apply(A a); }
3485	<	/** Interface describing a function of two arguments */
3486	<	public interface BiFun<A,B,T> { T apply(A a, B b); }
3487	<	/** Interface describing a function of no arguments */
3488	<	public interface Generator<T> { T apply(); }
3489	<	/** Interface describing a function mapping its argument to a double */
3490	<	public interface ObjectToDouble<A> { double apply(A a); }
3491	<	/** Interface describing a function mapping its argument to a long */
3492	<	public interface ObjectToLong<A> { long apply(A a); }
3493	<	/** Interface describing a function mapping its argument to an int */
3494	<	public interface ObjectToInt<A> {int apply(A a); }
3495	<	/** Interface describing a function mapping two arguments to a double */
3496	<	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
3497	<	/** Interface describing a function mapping two arguments to a long */
3498	<	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
3499	<	/** Interface describing a function mapping two arguments to an int */
3500	<	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
3501	<	/** Interface describing a function mapping a double to a double */
3502	<	public interface DoubleToDouble { double apply(double a); }
3503	<	/** Interface describing a function mapping a long to a long */
3504	<	public interface LongToLong { long apply(long a); }
3505	<	/** Interface describing a function mapping an int to an int */
3506	<	public interface IntToInt { int apply(int a); }
3507	<	/** Interface describing a function mapping two doubles to a double */
3508	<	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3509	<	/** Interface describing a function mapping two longs to a long */
3510	<	public interface LongByLongToLong { long apply(long a, long b); }
3511	<	/** Interface describing a function mapping two ints to an int */
3512	<	public interface IntByIntToInt { int apply(int a, int b); }
3363	>	public void forEachRemaining(Action<? super Map.Entry<K,V>> action) {
3364	>	if (action == null) throw new NullPointerException();
3365	>	for (Node<K,V> p; (p = advance()) != null; )
3366	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3367	>	}
3368
3369	+	public boolean tryAdvance(Action<? super Map.Entry<K,V>> action) {
3370	+	if (action == null) throw new NullPointerException();
3371	+	Node<K,V> p;
3372	+	if ((p = advance()) == null)
3373	+	return false;
3374	+	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3375	+	return true;
3376	+	}
3377
3378	<	// -------------------------------------------------------
3378	>	public long estimateSize() { return est; }
3379	>
3380	>	}
3381	>
3382	>	// Parallel bulk operations
3383	>
3384	>	/**
3385	>	* Computes initial batch value for bulk tasks. The returned value
3386	>	* is approximately exp2 of the number of times (minus one) to
3387	>	* split task by two before executing leaf action. This value is
3388	>	* faster to compute and more convenient to use as a guide to
3389	>	* splitting than is the depth, since it is used while dividing by
3390	>	* two anyway.
3391	>	*/
3392	>	final int batchFor(long b) {
3393	>	long n;
3394	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3395	>	return 0;
3396	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3397	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3398	>	}
3399
3400		/**
3401		* Performs the given action for each (key, value).
3402		*
3403	+	* @param parallelismThreshold the (estimated) number of elements
3404	+	* needed for this operation to be executed in parallel
3405		* @param action the action
3406	+	* @since 1.8
3407		*/
3408	<	public void forEach(BiAction<K,V> action) {
3409	<	ForkJoinTasks.forEach
3410	<	(this, action).invoke();
3408	>	public void forEach(long parallelismThreshold,
3409	>	BiAction<? super K,? super V> action) {
3410	>	if (action == null) throw new NullPointerException();
3411	>	new ForEachMappingTask<K,V>
3412	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3413	>	action).invoke();
3414		}
3415
3416		/**
3417		* Performs the given action for each non-null transformation
3418		* of each (key, value).
3419		*
3420	+	* @param parallelismThreshold the (estimated) number of elements
3421	+	* needed for this operation to be executed in parallel
3422		* @param transformer a function returning the transformation
3423	<	* for an element, or null of there is no transformation (in
3424	<	* which case the action is not applied).
3423	>	* for an element, or null if there is no transformation (in
3424	>	* which case the action is not applied)
3425		* @param action the action
3426	+	* @since 1.8
3427		*/
3428	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3429	<	Action<U> action) {
3430	<	ForkJoinTasks.forEach
3431	<	(this, transformer, action).invoke();
3428	>	public <U> void forEach(long parallelismThreshold,
3429	>	BiFun<? super K, ? super V, ? extends U> transformer,
3430	>	Action<? super U> action) {
3431	>	if (transformer == null || action == null)
3432	>	throw new NullPointerException();
3433	>	new ForEachTransformedMappingTask<K,V,U>
3434	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3435	>	transformer, action).invoke();
3436		}
3437
3438		/**
#	Line 3546 | Line 3442 | public class ConcurrentHashMapV8<K, V>
3442		* results of any other parallel invocations of the search
3443		* function are ignored.
3444		*
3445	+	* @param parallelismThreshold the (estimated) number of elements
3446	+	* needed for this operation to be executed in parallel
3447		* @param searchFunction a function returning a non-null
3448		* result on success, else null
3449		* @return a non-null result from applying the given search
3450		* function on each (key, value), or null if none
3451	+	* @since 1.8
3452		*/
3453	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3454	<	return ForkJoinTasks.search
3455	<	(this, searchFunction).invoke();
3453	>	public <U> U search(long parallelismThreshold,
3454	>	BiFun<? super K, ? super V, ? extends U> searchFunction) {
3455	>	if (searchFunction == null) throw new NullPointerException();
3456	>	return new SearchMappingsTask<K,V,U>
3457	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3458	>	searchFunction, new AtomicReference<U>()).invoke();
3459		}
3460
3461		/**
#	Line 3561 | Line 3463 | public class ConcurrentHashMapV8<K, V>
3463		* of all (key, value) pairs using the given reducer to
3464		* combine values, or null if none.
3465		*
3466	+	* @param parallelismThreshold the (estimated) number of elements
3467	+	* needed for this operation to be executed in parallel
3468		* @param transformer a function returning the transformation
3469	<	* for an element, or null of there is no transformation (in
3470	<	* which case it is not combined).
3469	>	* for an element, or null if there is no transformation (in
3470	>	* which case it is not combined)
3471		* @param reducer a commutative associative combining function
3472		* @return the result of accumulating the given transformation
3473		* of all (key, value) pairs
3474	+	* @since 1.8
3475		*/
3476	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3476	>	public <U> U reduce(long parallelismThreshold,
3477	>	BiFun<? super K, ? super V, ? extends U> transformer,
3478		BiFun<? super U, ? super U, ? extends U> reducer) {
3479	<	return ForkJoinTasks.reduce
3480	<	(this, transformer, reducer).invoke();
3479	>	if (transformer == null || reducer == null)
3480	>	throw new NullPointerException();
3481	>	return new MapReduceMappingsTask<K,V,U>
3482	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3483	>	null, transformer, reducer).invoke();
3484		}
3485
3486		/**
#	Line 3579 | Line 3488 | public class ConcurrentHashMapV8<K, V>
3488		* of all (key, value) pairs using the given reducer to
3489		* combine values, and the given basis as an identity value.
3490		*
3491	+	* @param parallelismThreshold the (estimated) number of elements
3492	+	* needed for this operation to be executed in parallel
3493		* @param transformer a function returning the transformation
3494		* for an element
3495		* @param basis the identity (initial default value) for the reduction
3496		* @param reducer a commutative associative combining function
3497		* @return the result of accumulating the given transformation
3498		* of all (key, value) pairs
3499	+	* @since 1.8
3500		*/
3501	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3501	>	public double reduceToDouble(long parallelismThreshold,
3502	>	ObjectByObjectToDouble<? super K, ? super V> transformer,
3503		double basis,
3504		DoubleByDoubleToDouble reducer) {
3505	<	return ForkJoinTasks.reduceToDouble
3506	<	(this, transformer, basis, reducer).invoke();
3505	>	if (transformer == null || reducer == null)
3506	>	throw new NullPointerException();
3507	>	return new MapReduceMappingsToDoubleTask<K,V>
3508	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3509	>	null, transformer, basis, reducer).invoke();
3510		}
3511
3512		/**
#	Line 3598 | Line 3514 | public class ConcurrentHashMapV8<K, V>
3514		* of all (key, value) pairs using the given reducer to
3515		* combine values, and the given basis as an identity value.
3516		*
3517	+	* @param parallelismThreshold the (estimated) number of elements
3518	+	* needed for this operation to be executed in parallel
3519		* @param transformer a function returning the transformation
3520		* for an element
3521		* @param basis the identity (initial default value) for the reduction
3522		* @param reducer a commutative associative combining function
3523		* @return the result of accumulating the given transformation
3524		* of all (key, value) pairs
3525	+	* @since 1.8
3526		*/
3527	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3527	>	public long reduceToLong(long parallelismThreshold,
3528	>	ObjectByObjectToLong<? super K, ? super V> transformer,
3529		long basis,
3530		LongByLongToLong reducer) {
3531	<	return ForkJoinTasks.reduceToLong
3532	<	(this, transformer, basis, reducer).invoke();
3531	>	if (transformer == null || reducer == null)
3532	>	throw new NullPointerException();
3533	>	return new MapReduceMappingsToLongTask<K,V>
3534	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3535	>	null, transformer, basis, reducer).invoke();
3536		}
3537
3538		/**
#	Line 3617 | Line 3540 | public class ConcurrentHashMapV8<K, V>
3540		* of all (key, value) pairs using the given reducer to
3541		* combine values, and the given basis as an identity value.
3542		*
3543	+	* @param parallelismThreshold the (estimated) number of elements
3544	+	* needed for this operation to be executed in parallel
3545		* @param transformer a function returning the transformation
3546		* for an element
3547		* @param basis the identity (initial default value) for the reduction
3548		* @param reducer a commutative associative combining function
3549		* @return the result of accumulating the given transformation
3550		* of all (key, value) pairs
3551	+	* @since 1.8
3552		*/
3553	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3553	>	public int reduceToInt(long parallelismThreshold,
3554	>	ObjectByObjectToInt<? super K, ? super V> transformer,
3555		int basis,
3556		IntByIntToInt reducer) {
3557	<	return ForkJoinTasks.reduceToInt
3558	<	(this, transformer, basis, reducer).invoke();
3557	>	if (transformer == null || reducer == null)
3558	>	throw new NullPointerException();
3559	>	return new MapReduceMappingsToIntTask<K,V>
3560	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3561	>	null, transformer, basis, reducer).invoke();
3562		}
3563
3564		/**
3565		* Performs the given action for each key.
3566		*
3567	+	* @param parallelismThreshold the (estimated) number of elements
3568	+	* needed for this operation to be executed in parallel
3569		* @param action the action
3570	+	* @since 1.8
3571		*/
3572	<	public void forEachKey(Action<K> action) {
3573	<	ForkJoinTasks.forEachKey
3574	<	(this, action).invoke();
3572	>	public void forEachKey(long parallelismThreshold,
3573	>	Action<? super K> action) {
3574	>	if (action == null) throw new NullPointerException();
3575	>	new ForEachKeyTask<K,V>
3576	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3577	>	action).invoke();
3578		}
3579
3580		/**
3581		* Performs the given action for each non-null transformation
3582		* of each key.
3583		*
3584	+	* @param parallelismThreshold the (estimated) number of elements
3585	+	* needed for this operation to be executed in parallel
3586		* @param transformer a function returning the transformation
3587	<	* for an element, or null of there is no transformation (in
3588	<	* which case the action is not applied).
3587	>	* for an element, or null if there is no transformation (in
3588	>	* which case the action is not applied)
3589		* @param action the action
3590	+	* @since 1.8
3591		*/
3592	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3593	<	Action<U> action) {
3594	<	ForkJoinTasks.forEachKey
3595	<	(this, transformer, action).invoke();
3592	>	public <U> void forEachKey(long parallelismThreshold,
3593	>	Fun<? super K, ? extends U> transformer,
3594	>	Action<? super U> action) {
3595	>	if (transformer == null || action == null)
3596	>	throw new NullPointerException();
3597	>	new ForEachTransformedKeyTask<K,V,U>
3598	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3599	>	transformer, action).invoke();
3600		}
3601
3602		/**
#	Line 3663 | Line 3606 | public class ConcurrentHashMapV8<K, V>
3606		* any other parallel invocations of the search function are
3607		* ignored.
3608		*
3609	+	* @param parallelismThreshold the (estimated) number of elements
3610	+	* needed for this operation to be executed in parallel
3611		* @param searchFunction a function returning a non-null
3612		* result on success, else null
3613		* @return a non-null result from applying the given search
3614		* function on each key, or null if none
3615	+	* @since 1.8
3616		*/
3617	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3618	<	return ForkJoinTasks.searchKeys
3619	<	(this, searchFunction).invoke();
3617	>	public <U> U searchKeys(long parallelismThreshold,
3618	>	Fun<? super K, ? extends U> searchFunction) {
3619	>	if (searchFunction == null) throw new NullPointerException();
3620	>	return new SearchKeysTask<K,V,U>
3621	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3622	>	searchFunction, new AtomicReference<U>()).invoke();
3623		}
3624
3625		/**
3626		* Returns the result of accumulating all keys using the given
3627		* reducer to combine values, or null if none.
3628		*
3629	+	* @param parallelismThreshold the (estimated) number of elements
3630	+	* needed for this operation to be executed in parallel
3631		* @param reducer a commutative associative combining function
3632		* @return the result of accumulating all keys using the given
3633		* reducer to combine values, or null if none
3634	+	* @since 1.8
3635		*/
3636	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3637	<	return ForkJoinTasks.reduceKeys
3638	<	(this, reducer).invoke();
3636	>	public K reduceKeys(long parallelismThreshold,
3637	>	BiFun<? super K, ? super K, ? extends K> reducer) {
3638	>	if (reducer == null) throw new NullPointerException();
3639	>	return new ReduceKeysTask<K,V>
3640	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3641	>	null, reducer).invoke();
3642		}
3643
3644		/**
#	Line 3691 | Line 3646 | public class ConcurrentHashMapV8<K, V>
3646		* of all keys using the given reducer to combine values, or
3647		* null if none.
3648		*
3649	+	* @param parallelismThreshold the (estimated) number of elements
3650	+	* needed for this operation to be executed in parallel
3651		* @param transformer a function returning the transformation
3652	<	* for an element, or null of there is no transformation (in
3653	<	* which case it is not combined).
3652	>	* for an element, or null if there is no transformation (in
3653	>	* which case it is not combined)
3654		* @param reducer a commutative associative combining function
3655		* @return the result of accumulating the given transformation
3656		* of all keys
3657	+	* @since 1.8
3658		*/
3659	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3660	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3661	<	return ForkJoinTasks.reduceKeys
3662	<	(this, transformer, reducer).invoke();
3659	>	public <U> U reduceKeys(long parallelismThreshold,
3660	>	Fun<? super K, ? extends U> transformer,
3661	>	BiFun<? super U, ? super U, ? extends U> reducer) {
3662	>	if (transformer == null || reducer == null)
3663	>	throw new NullPointerException();
3664	>	return new MapReduceKeysTask<K,V,U>
3665	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3666	>	null, transformer, reducer).invoke();
3667		}
3668
3669		/**
#	Line 3709 | Line 3671 | public class ConcurrentHashMapV8<K, V>
3671		* of all keys using the given reducer to combine values, and
3672		* the given basis as an identity value.
3673		*
3674	+	* @param parallelismThreshold the (estimated) number of elements
3675	+	* needed for this operation to be executed in parallel
3676		* @param transformer a function returning the transformation
3677		* for an element
3678		* @param basis the identity (initial default value) for the reduction
3679		* @param reducer a commutative associative combining function
3680	<	* @return  the result of accumulating the given transformation
3680	>	* @return the result of accumulating the given transformation
3681		* of all keys
3682	+	* @since 1.8
3683		*/
3684	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3684	>	public double reduceKeysToDouble(long parallelismThreshold,
3685	>	ObjectToDouble<? super K> transformer,
3686		double basis,
3687		DoubleByDoubleToDouble reducer) {
3688	<	return ForkJoinTasks.reduceKeysToDouble
3689	<	(this, transformer, basis, reducer).invoke();
3688	>	if (transformer == null || reducer == null)
3689	>	throw new NullPointerException();
3690	>	return new MapReduceKeysToDoubleTask<K,V>
3691	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3692	>	null, transformer, basis, reducer).invoke();
3693		}
3694
3695		/**
#	Line 3728 | Line 3697 | public class ConcurrentHashMapV8<K, V>
3697		* of all keys using the given reducer to combine values, and
3698		* the given basis as an identity value.
3699		*
3700	+	* @param parallelismThreshold the (estimated) number of elements
3701	+	* needed for this operation to be executed in parallel
3702		* @param transformer a function returning the transformation
3703		* for an element
3704		* @param basis the identity (initial default value) for the reduction
3705		* @param reducer a commutative associative combining function
3706		* @return the result of accumulating the given transformation
3707		* of all keys
3708	+	* @since 1.8
3709		*/
3710	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3710	>	public long reduceKeysToLong(long parallelismThreshold,
3711	>	ObjectToLong<? super K> transformer,
3712		long basis,
3713		LongByLongToLong reducer) {
3714	<	return ForkJoinTasks.reduceKeysToLong
3715	<	(this, transformer, basis, reducer).invoke();
3714	>	if (transformer == null || reducer == null)
3715	>	throw new NullPointerException();
3716	>	return new MapReduceKeysToLongTask<K,V>
3717	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3718	>	null, transformer, basis, reducer).invoke();
3719		}
3720
3721		/**
#	Line 3747 | Line 3723 | public class ConcurrentHashMapV8<K, V>
3723		* of all keys using the given reducer to combine values, and
3724		* the given basis as an identity value.
3725		*
3726	+	* @param parallelismThreshold the (estimated) number of elements
3727	+	* needed for this operation to be executed in parallel
3728		* @param transformer a function returning the transformation
3729		* for an element
3730		* @param basis the identity (initial default value) for the reduction
3731		* @param reducer a commutative associative combining function
3732		* @return the result of accumulating the given transformation
3733		* of all keys
3734	+	* @since 1.8
3735		*/
3736	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3736	>	public int reduceKeysToInt(long parallelismThreshold,
3737	>	ObjectToInt<? super K> transformer,
3738		int basis,
3739		IntByIntToInt reducer) {
3740	<	return ForkJoinTasks.reduceKeysToInt
3741	<	(this, transformer, basis, reducer).invoke();
3740	>	if (transformer == null || reducer == null)
3741	>	throw new NullPointerException();
3742	>	return new MapReduceKeysToIntTask<K,V>
3743	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3744	>	null, transformer, basis, reducer).invoke();
3745		}
3746
3747		/**
3748		* Performs the given action for each value.
3749		*
3750	+	* @param parallelismThreshold the (estimated) number of elements
3751	+	* needed for this operation to be executed in parallel
3752		* @param action the action
3753	+	* @since 1.8
3754		*/
3755	<	public void forEachValue(Action<V> action) {
3756	<	ForkJoinTasks.forEachValue
3757	<	(this, action).invoke();
3755	>	public void forEachValue(long parallelismThreshold,
3756	>	Action<? super V> action) {
3757	>	if (action == null)
3758	>	throw new NullPointerException();
3759	>	new ForEachValueTask<K,V>
3760	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3761	>	action).invoke();
3762		}
3763
3764		/**
3765		* Performs the given action for each non-null transformation
3766		* of each value.
3767		*
3768	+	* @param parallelismThreshold the (estimated) number of elements
3769	+	* needed for this operation to be executed in parallel
3770		* @param transformer a function returning the transformation
3771	<	* for an element, or null of there is no transformation (in
3772	<	* which case the action is not applied).
3771	>	* for an element, or null if there is no transformation (in
3772	>	* which case the action is not applied)
3773	>	* @param action the action
3774	>	* @since 1.8
3775		*/
3776	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3777	<	Action<U> action) {
3778	<	ForkJoinTasks.forEachValue
3779	<	(this, transformer, action).invoke();
3776	>	public <U> void forEachValue(long parallelismThreshold,
3777	>	Fun<? super V, ? extends U> transformer,
3778	>	Action<? super U> action) {
3779	>	if (transformer == null || action == null)
3780	>	throw new NullPointerException();
3781	>	new ForEachTransformedValueTask<K,V,U>
3782	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3783	>	transformer, action).invoke();
3784		}
3785
3786		/**
#	Line 3792 | Line 3790 | public class ConcurrentHashMapV8<K, V>
3790		* any other parallel invocations of the search function are
3791		* ignored.
3792		*
3793	+	* @param parallelismThreshold the (estimated) number of elements
3794	+	* needed for this operation to be executed in parallel
3795		* @param searchFunction a function returning a non-null
3796		* result on success, else null
3797		* @return a non-null result from applying the given search
3798		* function on each value, or null if none
3799	<	*
3799	>	* @since 1.8
3800		*/
3801	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3802	<	return ForkJoinTasks.searchValues
3803	<	(this, searchFunction).invoke();
3801	>	public <U> U searchValues(long parallelismThreshold,
3802	>	Fun<? super V, ? extends U> searchFunction) {
3803	>	if (searchFunction == null) throw new NullPointerException();
3804	>	return new SearchValuesTask<K,V,U>
3805	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3806	>	searchFunction, new AtomicReference<U>()).invoke();
3807		}
3808
3809		/**
3810		* Returns the result of accumulating all values using the
3811		* given reducer to combine values, or null if none.
3812		*
3813	+	* @param parallelismThreshold the (estimated) number of elements
3814	+	* needed for this operation to be executed in parallel
3815		* @param reducer a commutative associative combining function
3816	<	* @return  the result of accumulating all values
3816	>	* @return the result of accumulating all values
3817	>	* @since 1.8
3818		*/
3819	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3820	<	return ForkJoinTasks.reduceValues
3821	<	(this, reducer).invoke();
3819	>	public V reduceValues(long parallelismThreshold,
3820	>	BiFun<? super V, ? super V, ? extends V> reducer) {
3821	>	if (reducer == null) throw new NullPointerException();
3822	>	return new ReduceValuesTask<K,V>
3823	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3824	>	null, reducer).invoke();
3825		}
3826
3827		/**
#	Line 3820 | Line 3829 | public class ConcurrentHashMapV8<K, V>
3829		* of all values using the given reducer to combine values, or
3830		* null if none.
3831		*
3832	+	* @param parallelismThreshold the (estimated) number of elements
3833	+	* needed for this operation to be executed in parallel
3834		* @param transformer a function returning the transformation
3835	<	* for an element, or null of there is no transformation (in
3836	<	* which case it is not combined).
3835	>	* for an element, or null if there is no transformation (in
3836	>	* which case it is not combined)
3837		* @param reducer a commutative associative combining function
3838		* @return the result of accumulating the given transformation
3839		* of all values
3840	+	* @since 1.8
3841		*/
3842	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3842	>	public <U> U reduceValues(long parallelismThreshold,
3843	>	Fun<? super V, ? extends U> transformer,
3844		BiFun<? super U, ? super U, ? extends U> reducer) {
3845	<	return ForkJoinTasks.reduceValues
3846	<	(this, transformer, reducer).invoke();
3845	>	if (transformer == null || reducer == null)
3846	>	throw new NullPointerException();
3847	>	return new MapReduceValuesTask<K,V,U>
3848	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3849	>	null, transformer, reducer).invoke();
3850		}
3851
3852		/**
#	Line 3838 | Line 3854 | public class ConcurrentHashMapV8<K, V>
3854		* of all values using the given reducer to combine values,
3855		* and the given basis as an identity value.
3856		*
3857	+	* @param parallelismThreshold the (estimated) number of elements
3858	+	* needed for this operation to be executed in parallel
3859		* @param transformer a function returning the transformation
3860		* for an element
3861		* @param basis the identity (initial default value) for the reduction
3862		* @param reducer a commutative associative combining function
3863		* @return the result of accumulating the given transformation
3864		* of all values
3865	+	* @since 1.8
3866		*/
3867	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
3867	>	public double reduceValuesToDouble(long parallelismThreshold,
3868	>	ObjectToDouble<? super V> transformer,
3869		double basis,
3870		DoubleByDoubleToDouble reducer) {
3871	<	return ForkJoinTasks.reduceValuesToDouble
3872	<	(this, transformer, basis, reducer).invoke();
3871	>	if (transformer == null || reducer == null)
3872	>	throw new NullPointerException();
3873	>	return new MapReduceValuesToDoubleTask<K,V>
3874	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3875	>	null, transformer, basis, reducer).invoke();
3876		}
3877
3878		/**
#	Line 3857 | Line 3880 | public class ConcurrentHashMapV8<K, V>
3880		* of all values using the given reducer to combine values,
3881		* and the given basis as an identity value.
3882		*
3883	+	* @param parallelismThreshold the (estimated) number of elements
3884	+	* needed for this operation to be executed in parallel
3885		* @param transformer a function returning the transformation
3886		* for an element
3887		* @param basis the identity (initial default value) for the reduction
3888		* @param reducer a commutative associative combining function
3889		* @return the result of accumulating the given transformation
3890		* of all values
3891	+	* @since 1.8
3892		*/
3893	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
3893	>	public long reduceValuesToLong(long parallelismThreshold,
3894	>	ObjectToLong<? super V> transformer,
3895		long basis,
3896		LongByLongToLong reducer) {
3897	<	return ForkJoinTasks.reduceValuesToLong
3898	<	(this, transformer, basis, reducer).invoke();
3897	>	if (transformer == null || reducer == null)
3898	>	throw new NullPointerException();
3899	>	return new MapReduceValuesToLongTask<K,V>
3900	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3901	>	null, transformer, basis, reducer).invoke();
3902		}
3903
3904		/**
#	Line 3876 | Line 3906 | public class ConcurrentHashMapV8<K, V>
3906		* of all values using the given reducer to combine values,
3907		* and the given basis as an identity value.
3908		*
3909	+	* @param parallelismThreshold the (estimated) number of elements
3910	+	* needed for this operation to be executed in parallel
3911		* @param transformer a function returning the transformation
3912		* for an element
3913		* @param basis the identity (initial default value) for the reduction
3914		* @param reducer a commutative associative combining function
3915		* @return the result of accumulating the given transformation
3916		* of all values
3917	+	* @since 1.8
3918		*/
3919	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
3919	>	public int reduceValuesToInt(long parallelismThreshold,
3920	>	ObjectToInt<? super V> transformer,
3921		int basis,
3922		IntByIntToInt reducer) {
3923	<	return ForkJoinTasks.reduceValuesToInt
3924	<	(this, transformer, basis, reducer).invoke();
3923	>	if (transformer == null || reducer == null)
3924	>	throw new NullPointerException();
3925	>	return new MapReduceValuesToIntTask<K,V>
3926	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3927	>	null, transformer, basis, reducer).invoke();
3928		}
3929
3930		/**
3931		* Performs the given action for each entry.
3932		*
3933	+	* @param parallelismThreshold the (estimated) number of elements
3934	+	* needed for this operation to be executed in parallel
3935		* @param action the action
3936	+	* @since 1.8
3937		*/
3938	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
3939	<	ForkJoinTasks.forEachEntry
3940	<	(this, action).invoke();
3938	>	public void forEachEntry(long parallelismThreshold,
3939	>	Action<? super Map.Entry<K,V>> action) {
3940	>	if (action == null) throw new NullPointerException();
3941	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
3942	>	action).invoke();
3943		}
3944
3945		/**
3946		* Performs the given action for each non-null transformation
3947		* of each entry.
3948		*
3949	+	* @param parallelismThreshold the (estimated) number of elements
3950	+	* needed for this operation to be executed in parallel
3951		* @param transformer a function returning the transformation
3952	<	* for an element, or null of there is no transformation (in
3953	<	* which case the action is not applied).
3952	>	* for an element, or null if there is no transformation (in
3953	>	* which case the action is not applied)
3954		* @param action the action
3955	+	* @since 1.8
3956		*/
3957	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
3958	<	Action<U> action) {
3959	<	ForkJoinTasks.forEachEntry
3960	<	(this, transformer, action).invoke();
3957	>	public <U> void forEachEntry(long parallelismThreshold,
3958	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
3959	>	Action<? super U> action) {
3960	>	if (transformer == null || action == null)
3961	>	throw new NullPointerException();
3962	>	new ForEachTransformedEntryTask<K,V,U>
3963	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3964	>	transformer, action).invoke();
3965		}
3966
3967		/**
#	Line 3922 | Line 3971 | public class ConcurrentHashMapV8<K, V>
3971		* any other parallel invocations of the search function are
3972		* ignored.
3973		*
3974	+	* @param parallelismThreshold the (estimated) number of elements
3975	+	* needed for this operation to be executed in parallel
3976		* @param searchFunction a function returning a non-null
3977		* result on success, else null
3978		* @return a non-null result from applying the given search
3979		* function on each entry, or null if none
3980	+	* @since 1.8
3981		*/
3982	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
3983	<	return ForkJoinTasks.searchEntries
3984	<	(this, searchFunction).invoke();
3982	>	public <U> U searchEntries(long parallelismThreshold,
3983	>	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
3984	>	if (searchFunction == null) throw new NullPointerException();
3985	>	return new SearchEntriesTask<K,V,U>
3986	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3987	>	searchFunction, new AtomicReference<U>()).invoke();
3988		}
3989
3990		/**
3991		* Returns the result of accumulating all entries using the
3992		* given reducer to combine values, or null if none.
3993		*
3994	+	* @param parallelismThreshold the (estimated) number of elements
3995	+	* needed for this operation to be executed in parallel
3996		* @param reducer a commutative associative combining function
3997		* @return the result of accumulating all entries
3998	+	* @since 1.8
3999		*/
4000	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4001	<	return ForkJoinTasks.reduceEntries
4002	<	(this, reducer).invoke();
4000	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4001	>	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4002	>	if (reducer == null) throw new NullPointerException();
4003	>	return new ReduceEntriesTask<K,V>
4004	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4005	>	null, reducer).invoke();
4006		}
4007
4008		/**
#	Line 3949 | Line 4010 | public class ConcurrentHashMapV8<K, V>
4010		* of all entries using the given reducer to combine values,
4011		* or null if none.
4012		*
4013	+	* @param parallelismThreshold the (estimated) number of elements
4014	+	* needed for this operation to be executed in parallel
4015		* @param transformer a function returning the transformation
4016	<	* for an element, or null of there is no transformation (in
4017	<	* which case it is not combined).
4016	>	* for an element, or null if there is no transformation (in
4017	>	* which case it is not combined)
4018		* @param reducer a commutative associative combining function
4019		* @return the result of accumulating the given transformation
4020		* of all entries
4021	+	* @since 1.8
4022		*/
4023	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4023	>	public <U> U reduceEntries(long parallelismThreshold,
4024	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4025		BiFun<? super U, ? super U, ? extends U> reducer) {
4026	<	return ForkJoinTasks.reduceEntries
4027	<	(this, transformer, reducer).invoke();
4026	>	if (transformer == null || reducer == null)
4027	>	throw new NullPointerException();
4028	>	return new MapReduceEntriesTask<K,V,U>
4029	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4030	>	null, transformer, reducer).invoke();
4031		}
4032
4033		/**
#	Line 3967 | Line 4035 | public class ConcurrentHashMapV8<K, V>
4035		* of all entries using the given reducer to combine values,
4036		* and the given basis as an identity value.
4037		*
4038	+	* @param parallelismThreshold the (estimated) number of elements
4039	+	* needed for this operation to be executed in parallel
4040		* @param transformer a function returning the transformation
4041		* for an element
4042		* @param basis the identity (initial default value) for the reduction
4043		* @param reducer a commutative associative combining function
4044		* @return the result of accumulating the given transformation
4045		* of all entries
4046	+	* @since 1.8
4047		*/
4048	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4048	>	public double reduceEntriesToDouble(long parallelismThreshold,
4049	>	ObjectToDouble<Map.Entry<K,V>> transformer,
4050		double basis,
4051		DoubleByDoubleToDouble reducer) {
4052	<	return ForkJoinTasks.reduceEntriesToDouble
4053	<	(this, transformer, basis, reducer).invoke();
4052	>	if (transformer == null || reducer == null)
4053	>	throw new NullPointerException();
4054	>	return new MapReduceEntriesToDoubleTask<K,V>
4055	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4056	>	null, transformer, basis, reducer).invoke();
4057		}
4058
4059		/**
#	Line 3986 | Line 4061 | public class ConcurrentHashMapV8<K, V>
4061		* of all entries using the given reducer to combine values,
4062		* and the given basis as an identity value.
4063		*
4064	+	* @param parallelismThreshold the (estimated) number of elements
4065	+	* needed for this operation to be executed in parallel
4066		* @param transformer a function returning the transformation
4067		* for an element
4068		* @param basis the identity (initial default value) for the reduction
4069		* @param reducer a commutative associative combining function
4070	<	* @return  the result of accumulating the given transformation
4070	>	* @return the result of accumulating the given transformation
4071		* of all entries
4072	+	* @since 1.8
4073		*/
4074	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4074	>	public long reduceEntriesToLong(long parallelismThreshold,
4075	>	ObjectToLong<Map.Entry<K,V>> transformer,
4076		long basis,
4077		LongByLongToLong reducer) {
4078	<	return ForkJoinTasks.reduceEntriesToLong
4079	<	(this, transformer, basis, reducer).invoke();
4078	>	if (transformer == null || reducer == null)
4079	>	throw new NullPointerException();
4080	>	return new MapReduceEntriesToLongTask<K,V>
4081	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4082	>	null, transformer, basis, reducer).invoke();
4083		}
4084
4085		/**
#	Line 4005 | Line 4087 | public class ConcurrentHashMapV8<K, V>
4087		* of all entries using the given reducer to combine values,
4088		* and the given basis as an identity value.
4089		*
4090	+	* @param parallelismThreshold the (estimated) number of elements
4091	+	* needed for this operation to be executed in parallel
4092		* @param transformer a function returning the transformation
4093		* for an element
4094		* @param basis the identity (initial default value) for the reduction
4095		* @param reducer a commutative associative combining function
4096		* @return the result of accumulating the given transformation
4097		* of all entries
4098	+	* @since 1.8
4099		*/
4100	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4100	>	public int reduceEntriesToInt(long parallelismThreshold,
4101	>	ObjectToInt<Map.Entry<K,V>> transformer,
4102		int basis,
4103		IntByIntToInt reducer) {
4104	<	return ForkJoinTasks.reduceEntriesToInt
4105	<	(this, transformer, basis, reducer).invoke();
4104	>	if (transformer == null || reducer == null)
4105	>	throw new NullPointerException();
4106	>	return new MapReduceEntriesToIntTask<K,V>
4107	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4108	>	null, transformer, basis, reducer).invoke();
4109		}
4110
4111	+
4112		/* ----------------Views -------------- */
4113
4114		/**
4115		* Base class for views.
4116		*/
4117	<	static abstract class CHMView<K, V> {
4118	<	final ConcurrentHashMapV8<K, V> map;
4119	<	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
4117	>	abstract static class CollectionView<K,V,E>
4118	>	implements Collection<E>, java.io.Serializable {
4119	>	private static final long serialVersionUID = 7249069246763182397L;
4120	>	final ConcurrentHashMapV8<K,V> map;
4121	>	CollectionView(ConcurrentHashMapV8<K,V> map)  { this.map = map; }
4122
4123		/**
4124		* Returns the map backing this view.
#	Line 4035 | Line 4127 | public class ConcurrentHashMapV8<K, V>
4127		*/
4128		public ConcurrentHashMapV8<K,V> getMap() { return map; }
4129
4130	<	public final int size()                 { return map.size(); }
4131	<	public final boolean isEmpty()          { return map.isEmpty(); }
4132	<	public final void clear()               { map.clear(); }
4130	>	/**
4131	>	* Removes all of the elements from this view, by removing all
4132	>	* the mappings from the map backing this view.
4133	>	*/
4134	>	public final void clear()      { map.clear(); }
4135	>	public final int size()        { return map.size(); }
4136	>	public final boolean isEmpty() { return map.isEmpty(); }
4137
4138		// implementations below rely on concrete classes supplying these
4139	<	abstract public Iterator<?> iterator();
4140	<	abstract public boolean contains(Object o);
4141	<	abstract public boolean remove(Object o);
4139	>	// abstract methods
4140	>	/**
4141	>	* Returns a "weakly consistent" iterator that will never
4142	>	* throw {@link ConcurrentModificationException}, and
4143	>	* guarantees to traverse elements as they existed upon
4144	>	* construction of the iterator, and may (but is not
4145	>	* guaranteed to) reflect any modifications subsequent to
4146	>	* construction.
4147	>	*/
4148	>	public abstract Iterator<E> iterator();
4149	>	public abstract boolean contains(Object o);
4150	>	public abstract boolean remove(Object o);
4151
4152		private static final String oomeMsg = "Required array size too large";
4153
4154		public final Object[] toArray() {
4155		long sz = map.mappingCount();
4156	<	if (sz > (long)(MAX_ARRAY_SIZE))
4156	>	if (sz > MAX_ARRAY_SIZE)
4157		throw new OutOfMemoryError(oomeMsg);
4158		int n = (int)sz;
4159		Object[] r = new Object[n];
4160		int i = 0;
4161	<	Iterator<?> it = iterator();
4057	<	while (it.hasNext()) {
4161	>	for (E e : this) {
4162		if (i == n) {
4163		if (n >= MAX_ARRAY_SIZE)
4164		throw new OutOfMemoryError(oomeMsg);
#	Line 4064 | Line 4168 | public class ConcurrentHashMapV8<K, V>
4168		n += (n >>> 1) + 1;
4169		r = Arrays.copyOf(r, n);
4170		}
4171	<	r[i++] = it.next();
4171	>	r[i++] = e;
4172		}
4173		return (i == n) ? r : Arrays.copyOf(r, i);
4174		}
4175
4176	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4176	>	@SuppressWarnings("unchecked")
4177	>	public final <T> T[] toArray(T[] a) {
4178		long sz = map.mappingCount();
4179	<	if (sz > (long)(MAX_ARRAY_SIZE))
4179	>	if (sz > MAX_ARRAY_SIZE)
4180		throw new OutOfMemoryError(oomeMsg);
4181		int m = (int)sz;
4182		T[] r = (a.length >= m) ? a :
#	Line 4079 | Line 4184 | public class ConcurrentHashMapV8<K, V>
4184		.newInstance(a.getClass().getComponentType(), m);
4185		int n = r.length;
4186		int i = 0;
4187	<	Iterator<?> it = iterator();
4083	<	while (it.hasNext()) {
4187	>	for (E e : this) {
4188		if (i == n) {
4189		if (n >= MAX_ARRAY_SIZE)
4190		throw new OutOfMemoryError(oomeMsg);
#	Line 4090 | Line 4194 | public class ConcurrentHashMapV8<K, V>
4194		n += (n >>> 1) + 1;
4195		r = Arrays.copyOf(r, n);
4196		}
4197	<	r[i++] = (T)it.next();
4197	>	r[i++] = (T)e;
4198		}
4199		if (a == r && i < n) {
4200		r[i] = null; // null-terminate
#	Line 4099 | Line 4203 | public class ConcurrentHashMapV8<K, V>
4203		return (i == n) ? r : Arrays.copyOf(r, i);
4204		}
4205
4206	<	public final int hashCode() {
4207	<	int h = 0;
4208	<	for (Iterator<?> it = iterator(); it.hasNext();)
4209	<	h += it.next().hashCode();
4210	<	return h;
4211	<	}
4212	<
4206	>	/**
4207	>	* Returns a string representation of this collection.
4208	>	* The string representation consists of the string representations
4209	>	* of the collection's elements in the order they are returned by
4210	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4211	>	* Adjacent elements are separated by the characters {@code ", "}
4212	>	* (comma and space).  Elements are converted to strings as by
4213	>	* {@link String#valueOf(Object)}.
4214	>	*
4215	>	* @return a string representation of this collection
4216	>	*/
4217		public final String toString() {
4218		StringBuilder sb = new StringBuilder();
4219		sb.append('[');
4220	<	Iterator<?> it = iterator();
4220	>	Iterator<E> it = iterator();
4221		if (it.hasNext()) {
4222		for (;;) {
4223		Object e = it.next();
#	Line 4124 | Line 4232 | public class ConcurrentHashMapV8<K, V>
4232
4233		public final boolean containsAll(Collection<?> c) {
4234		if (c != this) {
4235	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
4128	<	Object e = it.next();
4235	>	for (Object e : c) {
4236		if (e == null || !contains(e))
4237		return false;
4238		}
#	Line 4135 | Line 4242 | public class ConcurrentHashMapV8<K, V>
4242
4243		public final boolean removeAll(Collection<?> c) {
4244		boolean modified = false;
4245	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4245	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4246		if (c.contains(it.next())) {
4247		it.remove();
4248		modified = true;
#	Line 4146 | Line 4253 | public class ConcurrentHashMapV8<K, V>
4253
4254		public final boolean retainAll(Collection<?> c) {
4255		boolean modified = false;
4256	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4256	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4257		if (!c.contains(it.next())) {
4258		it.remove();
4259		modified = true;
#	Line 4160 | Line 4267 | public class ConcurrentHashMapV8<K, V>
4267		/**
4268		* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4269		* which additions may optionally be enabled by mapping to a
4270	<	* common value.  This class cannot be directly instantiated. See
4271	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4272	<	* {@link #newKeySet(int)}.
4270	>	* common value.  This class cannot be directly instantiated.
4271	>	* See {@link #keySet() keySet()},
4272	>	* {@link #keySet(Object) keySet(V)},
4273	>	* {@link #newKeySet() newKeySet()},
4274	>	* {@link #newKeySet(int) newKeySet(int)}.
4275	>	*
4276	>	* @since 1.8
4277		*/
4278	<	public static class KeySetView<K,V> extends CHMView<K,V> implements Set<K>, java.io.Serializable {
4278	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4279	>	implements Set<K>, java.io.Serializable {
4280		private static final long serialVersionUID = 7249069246763182397L;
4281		private final V value;
4282	<	KeySetView(ConcurrentHashMapV8<K, V> map, V value) {  // non-public
4282	>	KeySetView(ConcurrentHashMapV8<K,V> map, V value) {  // non-public
4283		super(map);
4284		this.value = value;
4285		}
#	Line 4177 | Line 4289 | public class ConcurrentHashMapV8<K, V>
4289		* or {@code null} if additions are not supported.
4290		*
4291		* @return the default mapped value for additions, or {@code null}
4292	<	* if not supported.
4292	>	* if not supported
4293		*/
4294		public V getMappedValue() { return value; }
4295
4296	<	// implement Set API
4297	<
4296	>	/**
4297	>	* {@inheritDoc}
4298	>	* @throws NullPointerException if the specified key is null
4299	>	*/
4300		public boolean contains(Object o) { return map.containsKey(o); }
4187	–	public boolean remove(Object o)   { return map.remove(o) != null; }
4301
4302		/**
4303	<	* Returns a "weakly consistent" iterator that will never
4304	<	* throw {@link ConcurrentModificationException}, and
4305	<	* guarantees to traverse elements as they existed upon
4306	<	* construction of the iterator, and may (but is not
4307	<	* guaranteed to) reflect any modifications subsequent to
4308	<	* construction.
4303	>	* Removes the key from this map view, by removing the key (and its
4304	>	* corresponding value) from the backing map.  This method does
4305	>	* nothing if the key is not in the map.
4306	>	*
4307	>	* @param  o the key to be removed from the backing map
4308	>	* @return {@code true} if the backing map contained the specified key
4309	>	* @throws NullPointerException if the specified key is null
4310	>	*/
4311	>	public boolean remove(Object o) { return map.remove(o) != null; }
4312	>
4313	>	/**
4314	>	* @return an iterator over the keys of the backing map
4315	>	*/
4316	>	public Iterator<K> iterator() {
4317	>	Node<K,V>[] t;
4318	>	ConcurrentHashMapV8<K,V> m = map;
4319	>	int f = (t = m.table) == null ? 0 : t.length;
4320	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4321	>	}
4322	>
4323	>	/**
4324	>	* Adds the specified key to this set view by mapping the key to
4325	>	* the default mapped value in the backing map, if defined.
4326		*
4327	<	* @return an iterator over the keys of this map
4327	>	* @param e key to be added
4328	>	* @return {@code true} if this set changed as a result of the call
4329	>	* @throws NullPointerException if the specified key is null
4330	>	* @throws UnsupportedOperationException if no default mapped value
4331	>	* for additions was provided
4332		*/
4199	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4333		public boolean add(K e) {
4334		V v;
4335		if ((v = value) == null)
4336		throw new UnsupportedOperationException();
4337	<	if (e == null)
4205	<	throw new NullPointerException();
4206	<	return map.internalPutIfAbsent(e, v) == null;
4337	>	return map.putVal(e, v, true) == null;
4338		}
4339	+
4340	+	/**
4341	+	* Adds all of the elements in the specified collection to this set,
4342	+	* as if by calling {@link #add} on each one.
4343	+	*
4344	+	* @param c the elements to be inserted into this set
4345	+	* @return {@code true} if this set changed as a result of the call
4346	+	* @throws NullPointerException if the collection or any of its
4347	+	* elements are {@code null}
4348	+	* @throws UnsupportedOperationException if no default mapped value
4349	+	* for additions was provided
4350	+	*/
4351		public boolean addAll(Collection<? extends K> c) {
4352		boolean added = false;
4353		V v;
4354		if ((v = value) == null)
4355		throw new UnsupportedOperationException();
4356		for (K e : c) {
4357	<	if (e == null)
4215	<	throw new NullPointerException();
4216	<	if (map.internalPutIfAbsent(e, v) == null)
4357	>	if (map.putVal(e, v, true) == null)
4358		added = true;
4359		}
4360		return added;
4361		}
4362	+
4363	+	public int hashCode() {
4364	+	int h = 0;
4365	+	for (K e : this)
4366	+	h += e.hashCode();
4367	+	return h;
4368	+	}
4369	+
4370		public boolean equals(Object o) {
4371		Set<?> c;
4372		return ((o instanceof Set) &&
#	Line 4225 | Line 4374 | public class ConcurrentHashMapV8<K, V>
4374		(containsAll(c) && c.containsAll(this))));
4375		}
4376
4377	<	/**
4378	<	* Performs the given action for each key.
4379	<	*
4380	<	* @param action the action
4381	<	*/
4382	<	public void forEach(Action<K> action) {
4234	<	ForkJoinTasks.forEachKey
4235	<	(map, action).invoke();
4236	<	}
4237	<
4238	<	/**
4239	<	* Performs the given action for each non-null transformation
4240	<	* of each key.
4241	<	*
4242	<	* @param transformer a function returning the transformation
4243	<	* for an element, or null of there is no transformation (in
4244	<	* which case the action is not applied).
4245	<	* @param action the action
4246	<	*/
4247	<	public <U> void forEach(Fun<? super K, ? extends U> transformer,
4248	<	Action<U> action) {
4249	<	ForkJoinTasks.forEachKey
4250	<	(map, transformer, action).invoke();
4251	<	}
4252	<
4253	<	/**
4254	<	* Returns a non-null result from applying the given search
4255	<	* function on each key, or null if none. Upon success,
4256	<	* further element processing is suppressed and the results of
4257	<	* any other parallel invocations of the search function are
4258	<	* ignored.
4259	<	*
4260	<	* @param searchFunction a function returning a non-null
4261	<	* result on success, else null
4262	<	* @return a non-null result from applying the given search
4263	<	* function on each key, or null if none
4264	<	*/
4265	<	public <U> U search(Fun<? super K, ? extends U> searchFunction) {
4266	<	return ForkJoinTasks.searchKeys
4267	<	(map, searchFunction).invoke();
4268	<	}
4269	<
4270	<	/**
4271	<	* Returns the result of accumulating all keys using the given
4272	<	* reducer to combine values, or null if none.
4273	<	*
4274	<	* @param reducer a commutative associative combining function
4275	<	* @return the result of accumulating all keys using the given
4276	<	* reducer to combine values, or null if none
4277	<	*/
4278	<	public K reduce(BiFun<? super K, ? super K, ? extends K> reducer) {
4279	<	return ForkJoinTasks.reduceKeys
4280	<	(map, reducer).invoke();
4281	<	}
4282	<
4283	<	/**
4284	<	* Returns the result of accumulating the given transformation
4285	<	* of all keys using the given reducer to combine values, and
4286	<	* the given basis as an identity value.
4287	<	*
4288	<	* @param transformer a function returning the transformation
4289	<	* for an element
4290	<	* @param basis the identity (initial default value) for the reduction
4291	<	* @param reducer a commutative associative combining function
4292	<	* @return  the result of accumulating the given transformation
4293	<	* of all keys
4294	<	*/
4295	<	public double reduceToDouble(ObjectToDouble<? super K> transformer,
4296	<	double basis,
4297	<	DoubleByDoubleToDouble reducer) {
4298	<	return ForkJoinTasks.reduceKeysToDouble
4299	<	(map, transformer, basis, reducer).invoke();
4300	<	}
4301	<
4302	<
4303	<	/**
4304	<	* Returns the result of accumulating the given transformation
4305	<	* of all keys using the given reducer to combine values, and
4306	<	* the given basis as an identity value.
4307	<	*
4308	<	* @param transformer a function returning the transformation
4309	<	* for an element
4310	<	* @param basis the identity (initial default value) for the reduction
4311	<	* @param reducer a commutative associative combining function
4312	<	* @return the result of accumulating the given transformation
4313	<	* of all keys
4314	<	*/
4315	<	public long reduceToLong(ObjectToLong<? super K> transformer,
4316	<	long basis,
4317	<	LongByLongToLong reducer) {
4318	<	return ForkJoinTasks.reduceKeysToLong
4319	<	(map, transformer, basis, reducer).invoke();
4377	>	public ConcurrentHashMapSpliterator<K> spliterator() {
4378	>	Node<K,V>[] t;
4379	>	ConcurrentHashMapV8<K,V> m = map;
4380	>	long n = m.sumCount();
4381	>	int f = (t = m.table) == null ? 0 : t.length;
4382	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4383		}
4384
4385	<	/**
4386	<	* Returns the result of accumulating the given transformation
4387	<	* of all keys using the given reducer to combine values, and
4388	<	* the given basis as an identity value.
4389	<	*
4390	<	* @param transformer a function returning the transformation
4391	<	* for an element
4392	<	* @param basis the identity (initial default value) for the reduction
4330	<	* @param reducer a commutative associative combining function
4331	<	* @return the result of accumulating the given transformation
4332	<	* of all keys
4333	<	*/
4334	<	public int reduceToInt(ObjectToInt<? super K> transformer,
4335	<	int basis,
4336	<	IntByIntToInt reducer) {
4337	<	return ForkJoinTasks.reduceKeysToInt
4338	<	(map, transformer, basis, reducer).invoke();
4385	>	public void forEach(Action<? super K> action) {
4386	>	if (action == null) throw new NullPointerException();
4387	>	Node<K,V>[] t;
4388	>	if ((t = map.table) != null) {
4389	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4390	>	for (Node<K,V> p; (p = it.advance()) != null; )
4391	>	action.apply(p.key);
4392	>	}
4393		}
4340	–
4394		}
4395
4396		/**
4397		* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4398		* values, in which additions are disabled. This class cannot be
4399	<	* directly instantiated. See {@link #values},
4347	<	*
4348	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4349	<	* that will never throw {@link ConcurrentModificationException},
4350	<	* and guarantees to traverse elements as they existed upon
4351	<	* construction of the iterator, and may (but is not guaranteed to)
4352	<	* reflect any modifications subsequent to construction.
4399	>	* directly instantiated. See {@link #values()}.
4400		*/
4401	<	public static final class ValuesView<K,V> extends CHMView<K,V>
4402	<	implements Collection<V> {
4403	<	ValuesView(ConcurrentHashMapV8<K, V> map)   { super(map); }
4404	<	public final boolean contains(Object o) { return map.containsValue(o); }
4401	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4402	>	implements Collection<V>, java.io.Serializable {
4403	>	private static final long serialVersionUID = 2249069246763182397L;
4404	>	ValuesView(ConcurrentHashMapV8<K,V> map) { super(map); }
4405	>	public final boolean contains(Object o) {
4406	>	return map.containsValue(o);
4407	>	}
4408	>
4409		public final boolean remove(Object o) {
4410		if (o != null) {
4411	<	Iterator<V> it = new ValueIterator<K,V>(map);
4361	<	while (it.hasNext()) {
4411	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4412		if (o.equals(it.next())) {
4413		it.remove();
4414		return true;
#	Line 4368 | Line 4418 | public class ConcurrentHashMapV8<K, V>
4418		return false;
4419		}
4420
4371	–	/**
4372	–	* Returns a "weakly consistent" iterator that will never
4373	–	* throw {@link ConcurrentModificationException}, and
4374	–	* guarantees to traverse elements as they existed upon
4375	–	* construction of the iterator, and may (but is not
4376	–	* guaranteed to) reflect any modifications subsequent to
4377	–	* construction.
4378	–	*
4379	–	* @return an iterator over the values of this map
4380	–	*/
4421		public final Iterator<V> iterator() {
4422	<	return new ValueIterator<K,V>(map);
4422	>	ConcurrentHashMapV8<K,V> m = map;
4423	>	Node<K,V>[] t;
4424	>	int f = (t = m.table) == null ? 0 : t.length;
4425	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4426		}
4427	+
4428		public final boolean add(V e) {
4429		throw new UnsupportedOperationException();
4430		}
#	Line 4388 | Line 4432 | public class ConcurrentHashMapV8<K, V>
4432		throw new UnsupportedOperationException();
4433		}
4434
4435	<	/**
4436	<	* Performs the given action for each value.
4437	<	*
4438	<	* @param action the action
4439	<	*/
4440	<	public void forEach(Action<V> action) {
4397	<	ForkJoinTasks.forEachValue
4398	<	(map, action).invoke();
4399	<	}
4400	<
4401	<	/**
4402	<	* Performs the given action for each non-null transformation
4403	<	* of each value.
4404	<	*
4405	<	* @param transformer a function returning the transformation
4406	<	* for an element, or null of there is no transformation (in
4407	<	* which case the action is not applied).
4408	<	*/
4409	<	public <U> void forEach(Fun<? super V, ? extends U> transformer,
4410	<	Action<U> action) {
4411	<	ForkJoinTasks.forEachValue
4412	<	(map, transformer, action).invoke();
4435	>	public ConcurrentHashMapSpliterator<V> spliterator() {
4436	>	Node<K,V>[] t;
4437	>	ConcurrentHashMapV8<K,V> m = map;
4438	>	long n = m.sumCount();
4439	>	int f = (t = m.table) == null ? 0 : t.length;
4440	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4441		}
4442
4443	<	/**
4444	<	* Returns a non-null result from applying the given search
4445	<	* function on each value, or null if none.  Upon success,
4446	<	* further element processing is suppressed and the results of
4447	<	* any other parallel invocations of the search function are
4448	<	* ignored.
4449	<	*
4450	<	* @param searchFunction a function returning a non-null
4423	<	* result on success, else null
4424	<	* @return a non-null result from applying the given search
4425	<	* function on each value, or null if none
4426	<	*
4427	<	*/
4428	<	public <U> U search(Fun<? super V, ? extends U> searchFunction) {
4429	<	return ForkJoinTasks.searchValues
4430	<	(map, searchFunction).invoke();
4431	<	}
4432	<
4433	<	/**
4434	<	* Returns the result of accumulating all values using the
4435	<	* given reducer to combine values, or null if none.
4436	<	*
4437	<	* @param reducer a commutative associative combining function
4438	<	* @return  the result of accumulating all values
4439	<	*/
4440	<	public V reduce(BiFun<? super V, ? super V, ? extends V> reducer) {
4441	<	return ForkJoinTasks.reduceValues
4442	<	(map, reducer).invoke();
4443	<	}
4444	<
4445	<	/**
4446	<	* Returns the result of accumulating the given transformation
4447	<	* of all values using the given reducer to combine values, or
4448	<	* null if none.
4449	<	*
4450	<	* @param transformer a function returning the transformation
4451	<	* for an element, or null of there is no transformation (in
4452	<	* which case it is not combined).
4453	<	* @param reducer a commutative associative combining function
4454	<	* @return the result of accumulating the given transformation
4455	<	* of all values
4456	<	*/
4457	<	public <U> U reduce(Fun<? super V, ? extends U> transformer,
4458	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4459	<	return ForkJoinTasks.reduceValues
4460	<	(map, transformer, reducer).invoke();
4461	<	}
4462	<
4463	<	/**
4464	<	* Returns the result of accumulating the given transformation
4465	<	* of all values using the given reducer to combine values,
4466	<	* and the given basis as an identity value.
4467	<	*
4468	<	* @param transformer a function returning the transformation
4469	<	* for an element
4470	<	* @param basis the identity (initial default value) for the reduction
4471	<	* @param reducer a commutative associative combining function
4472	<	* @return the result of accumulating the given transformation
4473	<	* of all values
4474	<	*/
4475	<	public double reduceToDouble(ObjectToDouble<? super V> transformer,
4476	<	double basis,
4477	<	DoubleByDoubleToDouble reducer) {
4478	<	return ForkJoinTasks.reduceValuesToDouble
4479	<	(map, transformer, basis, reducer).invoke();
4480	<	}
4481	<
4482	<	/**
4483	<	* Returns the result of accumulating the given transformation
4484	<	* of all values using the given reducer to combine values,
4485	<	* and the given basis as an identity value.
4486	<	*
4487	<	* @param transformer a function returning the transformation
4488	<	* for an element
4489	<	* @param basis the identity (initial default value) for the reduction
4490	<	* @param reducer a commutative associative combining function
4491	<	* @return the result of accumulating the given transformation
4492	<	* of all values
4493	<	*/
4494	<	public long reduceToLong(ObjectToLong<? super V> transformer,
4495	<	long basis,
4496	<	LongByLongToLong reducer) {
4497	<	return ForkJoinTasks.reduceValuesToLong
4498	<	(map, transformer, basis, reducer).invoke();
4499	<	}
4500	<
4501	<	/**
4502	<	* Returns the result of accumulating the given transformation
4503	<	* of all values using the given reducer to combine values,
4504	<	* and the given basis as an identity value.
4505	<	*
4506	<	* @param transformer a function returning the transformation
4507	<	* for an element
4508	<	* @param basis the identity (initial default value) for the reduction
4509	<	* @param reducer a commutative associative combining function
4510	<	* @return the result of accumulating the given transformation
4511	<	* of all values
4512	<	*/
4513	<	public int reduceToInt(ObjectToInt<? super V> transformer,
4514	<	int basis,
4515	<	IntByIntToInt reducer) {
4516	<	return ForkJoinTasks.reduceValuesToInt
4517	<	(map, transformer, basis, reducer).invoke();
4443	>	public void forEach(Action<? super V> action) {
4444	>	if (action == null) throw new NullPointerException();
4445	>	Node<K,V>[] t;
4446	>	if ((t = map.table) != null) {
4447	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4448	>	for (Node<K,V> p; (p = it.advance()) != null; )
4449	>	action.apply(p.val);
4450	>	}
4451		}
4519	–
4452		}
4453
4454		/**
4455		* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4456		* entries.  This class cannot be directly instantiated. See
4457	<	* {@link #entrySet}.
4457	>	* {@link #entrySet()}.
4458		*/
4459	<	public static final class EntrySetView<K,V> extends CHMView<K,V>
4460	<	implements Set<Map.Entry<K,V>> {
4461	<	EntrySetView(ConcurrentHashMapV8<K, V> map) { super(map); }
4462	<	public final boolean contains(Object o) {
4459	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4460	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4461	>	private static final long serialVersionUID = 2249069246763182397L;
4462	>	EntrySetView(ConcurrentHashMapV8<K,V> map) { super(map); }
4463	>
4464	>	public boolean contains(Object o) {
4465		Object k, v, r; Map.Entry<?,?> e;
4466		return ((o instanceof Map.Entry) &&
4467		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4535 | Line 4469 | public class ConcurrentHashMapV8<K, V>
4469		(v = e.getValue()) != null &&
4470		(v == r || v.equals(r)));
4471		}
4472	<	public final boolean remove(Object o) {
4472	>
4473	>	public boolean remove(Object o) {
4474		Object k, v; Map.Entry<?,?> e;
4475		return ((o instanceof Map.Entry) &&
4476		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4544 | Line 4479 | public class ConcurrentHashMapV8<K, V>
4479		}
4480
4481		/**
4482	<	* Returns a "weakly consistent" iterator that will never
4548	<	* throw {@link ConcurrentModificationException}, and
4549	<	* guarantees to traverse elements as they existed upon
4550	<	* construction of the iterator, and may (but is not
4551	<	* guaranteed to) reflect any modifications subsequent to
4552	<	* construction.
4553	<	*
4554	<	* @return an iterator over the entries of this map
4482	>	* @return an iterator over the entries of the backing map
4483		*/
4484	<	public final Iterator<Map.Entry<K,V>> iterator() {
4485	<	return new EntryIterator<K,V>(map);
4484	>	public Iterator<Map.Entry<K,V>> iterator() {
4485	>	ConcurrentHashMapV8<K,V> m = map;
4486	>	Node<K,V>[] t;
4487	>	int f = (t = m.table) == null ? 0 : t.length;
4488	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4489		}
4490
4491	<	public final boolean add(Entry<K,V> e) {
4492	<	K key = e.getKey();
4562	<	V value = e.getValue();
4563	<	if (key == null || value == null)
4564	<	throw new NullPointerException();
4565	<	return map.internalPut(key, value) == null;
4491	>	public boolean add(Entry<K,V> e) {
4492	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4493		}
4494	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4494	>
4495	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4496		boolean added = false;
4497		for (Entry<K,V> e : c) {
4498		if (add(e))
#	Line 4572 | Line 4500 | public class ConcurrentHashMapV8<K, V>
4500		}
4501		return added;
4502		}
4503	<	public boolean equals(Object o) {
4503	>
4504	>	public final int hashCode() {
4505	>	int h = 0;
4506	>	Node<K,V>[] t;
4507	>	if ((t = map.table) != null) {
4508	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4509	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4510	>	h += p.hashCode();
4511	>	}
4512	>	}
4513	>	return h;
4514	>	}
4515	>
4516	>	public final boolean equals(Object o) {
4517		Set<?> c;
4518		return ((o instanceof Set) &&
4519		((c = (Set<?>)o) == this ||
4520		(containsAll(c) && c.containsAll(this))));
4521		}
4522
4523	<	/**
4524	<	* Performs the given action for each entry.
4525	<	*
4526	<	* @param action the action
4527	<	*/
4528	<	public void forEach(Action<Map.Entry<K,V>> action) {
4588	<	ForkJoinTasks.forEachEntry
4589	<	(map, action).invoke();
4590	<	}
4591	<
4592	<	/**
4593	<	* Performs the given action for each non-null transformation
4594	<	* of each entry.
4595	<	*
4596	<	* @param transformer a function returning the transformation
4597	<	* for an element, or null of there is no transformation (in
4598	<	* which case the action is not applied).
4599	<	* @param action the action
4600	<	*/
4601	<	public <U> void forEach(Fun<Map.Entry<K,V>, ? extends U> transformer,
4602	<	Action<U> action) {
4603	<	ForkJoinTasks.forEachEntry
4604	<	(map, transformer, action).invoke();
4605	<	}
4606	<
4607	<	/**
4608	<	* Returns a non-null result from applying the given search
4609	<	* function on each entry, or null if none.  Upon success,
4610	<	* further element processing is suppressed and the results of
4611	<	* any other parallel invocations of the search function are
4612	<	* ignored.
4613	<	*
4614	<	* @param searchFunction a function returning a non-null
4615	<	* result on success, else null
4616	<	* @return a non-null result from applying the given search
4617	<	* function on each entry, or null if none
4618	<	*/
4619	<	public <U> U search(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4620	<	return ForkJoinTasks.searchEntries
4621	<	(map, searchFunction).invoke();
4523	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> spliterator() {
4524	>	Node<K,V>[] t;
4525	>	ConcurrentHashMapV8<K,V> m = map;
4526	>	long n = m.sumCount();
4527	>	int f = (t = m.table) == null ? 0 : t.length;
4528	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4529		}
4530
4531	<	/**
4532	<	* Returns the result of accumulating all entries using the
4533	<	* given reducer to combine values, or null if none.
4534	<	*
4535	<	* @param reducer a commutative associative combining function
4536	<	* @return the result of accumulating all entries
4537	<	*/
4538	<	public Map.Entry<K,V> reduce(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4632	<	return ForkJoinTasks.reduceEntries
4633	<	(map, reducer).invoke();
4634	<	}
4635	<
4636	<	/**
4637	<	* Returns the result of accumulating the given transformation
4638	<	* of all entries using the given reducer to combine values,
4639	<	* or null if none.
4640	<	*
4641	<	* @param transformer a function returning the transformation
4642	<	* for an element, or null of there is no transformation (in
4643	<	* which case it is not combined).
4644	<	* @param reducer a commutative associative combining function
4645	<	* @return the result of accumulating the given transformation
4646	<	* of all entries
4647	<	*/
4648	<	public <U> U reduce(Fun<Map.Entry<K,V>, ? extends U> transformer,
4649	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4650	<	return ForkJoinTasks.reduceEntries
4651	<	(map, transformer, reducer).invoke();
4652	<	}
4653	<
4654	<	/**
4655	<	* Returns the result of accumulating the given transformation
4656	<	* of all entries using the given reducer to combine values,
4657	<	* and the given basis as an identity value.
4658	<	*
4659	<	* @param transformer a function returning the transformation
4660	<	* for an element
4661	<	* @param basis the identity (initial default value) for the reduction
4662	<	* @param reducer a commutative associative combining function
4663	<	* @return the result of accumulating the given transformation
4664	<	* of all entries
4665	<	*/
4666	<	public double reduceToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4667	<	double basis,
4668	<	DoubleByDoubleToDouble reducer) {
4669	<	return ForkJoinTasks.reduceEntriesToDouble
4670	<	(map, transformer, basis, reducer).invoke();
4671	<	}
4672	<
4673	<	/**
4674	<	* Returns the result of accumulating the given transformation
4675	<	* of all entries using the given reducer to combine values,
4676	<	* and the given basis as an identity value.
4677	<	*
4678	<	* @param transformer a function returning the transformation
4679	<	* for an element
4680	<	* @param basis the identity (initial default value) for the reduction
4681	<	* @param reducer a commutative associative combining function
4682	<	* @return  the result of accumulating the given transformation
4683	<	* of all entries
4684	<	*/
4685	<	public long reduceToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4686	<	long basis,
4687	<	LongByLongToLong reducer) {
4688	<	return ForkJoinTasks.reduceEntriesToLong
4689	<	(map, transformer, basis, reducer).invoke();
4690	<	}
4691	<
4692	<	/**
4693	<	* Returns the result of accumulating the given transformation
4694	<	* of all entries using the given reducer to combine values,
4695	<	* and the given basis as an identity value.
4696	<	*
4697	<	* @param transformer a function returning the transformation
4698	<	* for an element
4699	<	* @param basis the identity (initial default value) for the reduction
4700	<	* @param reducer a commutative associative combining function
4701	<	* @return the result of accumulating the given transformation
4702	<	* of all entries
4703	<	*/
4704	<	public int reduceToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4705	<	int basis,
4706	<	IntByIntToInt reducer) {
4707	<	return ForkJoinTasks.reduceEntriesToInt
4708	<	(map, transformer, basis, reducer).invoke();
4531	>	public void forEach(Action<? super Map.Entry<K,V>> action) {
4532	>	if (action == null) throw new NullPointerException();
4533	>	Node<K,V>[] t;
4534	>	if ((t = map.table) != null) {
4535	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4536	>	for (Node<K,V> p; (p = it.advance()) != null; )
4537	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
4538	>	}
4539		}
4540
4541		}
4542
4543	<	// ---------------------------------------------------------------------
4543	>	// -------------------------------------------------------
4544
4545		/**
4546	<	* Predefined tasks for performing bulk parallel operations on
4547	<	* ConcurrentHashMapV8s. These tasks follow the forms and rules used
4718	<	* for bulk operations. Each method has the same name, but returns
4719	<	* a task rather than invoking it. These methods may be useful in
4720	<	* custom applications such as submitting a task without waiting
4721	<	* for completion, using a custom pool, or combining with other
4722	<	* tasks.
4546	>	* Base class for bulk tasks. Repeats some fields and code from
4547	>	* class Traverser, because we need to subclass CountedCompleter.
4548		*/
4549	<	public static class ForkJoinTasks {
4550	<	private ForkJoinTasks() {}
4551	<
4552	<	/**
4553	<	* Returns a task that when invoked, performs the given
4554	<	* action for each (key, value)
4555	<	*
4556	<	* @param map the map
4557	<	* @param action the action
4558	<	* @return the task
4559	<	*/
4560	<	public static <K,V> ForkJoinTask<Void> forEach
4561	<	(ConcurrentHashMapV8<K,V> map,
4562	<	BiAction<K,V> action) {
4563	<	if (action == null) throw new NullPointerException();
4564	<	return new ForEachMappingTask<K,V>(map, null, -1, action);
4565	<	}
4566	<
4567	<	/**
4568	<	* Returns a task that when invoked, performs the given
4569	<	* action for each non-null transformation of each (key, value)
4745	<	*
4746	<	* @param map the map
4747	<	* @param transformer a function returning the transformation
4748	<	* for an element, or null if there is no transformation (in
4749	<	* which case the action is not applied)
4750	<	* @param action the action
4751	<	* @return the task
4752	<	*/
4753	<	public static <K,V,U> ForkJoinTask<Void> forEach
4754	<	(ConcurrentHashMapV8<K,V> map,
4755	<	BiFun<? super K, ? super V, ? extends U> transformer,
4756	<	Action<U> action) {
4757	<	if (transformer == null || action == null)
4758	<	throw new NullPointerException();
4759	<	return new ForEachTransformedMappingTask<K,V,U>
4760	<	(map, null, -1, transformer, action);
4761	<	}
4762	<
4763	<	/**
4764	<	* Returns a task that when invoked, returns a non-null result
4765	<	* from applying the given search function on each (key,
4766	<	* value), or null if none. Upon success, further element
4767	<	* processing is suppressed and the results of any other
4768	<	* parallel invocations of the search function are ignored.
4769	<	*
4770	<	* @param map the map
4771	<	* @param searchFunction a function returning a non-null
4772	<	* result on success, else null
4773	<	* @return the task
4774	<	*/
4775	<	public static <K,V,U> ForkJoinTask<U> search
4776	<	(ConcurrentHashMapV8<K,V> map,
4777	<	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4778	<	if (searchFunction == null) throw new NullPointerException();
4779	<	return new SearchMappingsTask<K,V,U>
4780	<	(map, null, -1, searchFunction,
4781	<	new AtomicReference<U>());
4782	<	}
4783	<
4784	<	/**
4785	<	* Returns a task that when invoked, returns the result of
4786	<	* accumulating the given transformation of all (key, value) pairs
4787	<	* using the given reducer to combine values, or null if none.
4788	<	*
4789	<	* @param map the map
4790	<	* @param transformer a function returning the transformation
4791	<	* for an element, or null if there is no transformation (in
4792	<	* which case it is not combined).
4793	<	* @param reducer a commutative associative combining function
4794	<	* @return the task
4795	<	*/
4796	<	public static <K,V,U> ForkJoinTask<U> reduce
4797	<	(ConcurrentHashMapV8<K,V> map,
4798	<	BiFun<? super K, ? super V, ? extends U> transformer,
4799	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4800	<	if (transformer == null || reducer == null)
4801	<	throw new NullPointerException();
4802	<	return new MapReduceMappingsTask<K,V,U>
4803	<	(map, null, -1, null, transformer, reducer);
4804	<	}
4805	<
4806	<	/**
4807	<	* Returns a task that when invoked, returns the result of
4808	<	* accumulating the given transformation of all (key, value) pairs
4809	<	* using the given reducer to combine values, and the given
4810	<	* basis as an identity value.
4811	<	*
4812	<	* @param map the map
4813	<	* @param transformer a function returning the transformation
4814	<	* for an element
4815	<	* @param basis the identity (initial default value) for the reduction
4816	<	* @param reducer a commutative associative combining function
4817	<	* @return the task
4818	<	*/
4819	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4820	<	(ConcurrentHashMapV8<K,V> map,
4821	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
4822	<	double basis,
4823	<	DoubleByDoubleToDouble reducer) {
4824	<	if (transformer == null || reducer == null)
4825	<	throw new NullPointerException();
4826	<	return new MapReduceMappingsToDoubleTask<K,V>
4827	<	(map, null, -1, null, transformer, basis, reducer);
4828	<	}
4829	<
4830	<	/**
4831	<	* Returns a task that when invoked, returns the result of
4832	<	* accumulating the given transformation of all (key, value) pairs
4833	<	* using the given reducer to combine values, and the given
4834	<	* basis as an identity value.
4835	<	*
4836	<	* @param map the map
4837	<	* @param transformer a function returning the transformation
4838	<	* for an element
4839	<	* @param basis the identity (initial default value) for the reduction
4840	<	* @param reducer a commutative associative combining function
4841	<	* @return the task
4842	<	*/
4843	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4844	<	(ConcurrentHashMapV8<K,V> map,
4845	<	ObjectByObjectToLong<? super K, ? super V> transformer,
4846	<	long basis,
4847	<	LongByLongToLong reducer) {
4848	<	if (transformer == null || reducer == null)
4849	<	throw new NullPointerException();
4850	<	return new MapReduceMappingsToLongTask<K,V>
4851	<	(map, null, -1, null, transformer, basis, reducer);
4852	<	}
4853	<
4854	<	/**
4855	<	* Returns a task that when invoked, returns the result of
4856	<	* accumulating the given transformation of all (key, value) pairs
4857	<	* using the given reducer to combine values, and the given
4858	<	* basis as an identity value.
4859	<	*
4860	<	* @param transformer a function returning the transformation
4861	<	* for an element
4862	<	* @param basis the identity (initial default value) for the reduction
4863	<	* @param reducer a commutative associative combining function
4864	<	* @return the task
4865	<	*/
4866	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4867	<	(ConcurrentHashMapV8<K,V> map,
4868	<	ObjectByObjectToInt<? super K, ? super V> transformer,
4869	<	int basis,
4870	<	IntByIntToInt reducer) {
4871	<	if (transformer == null || reducer == null)
4872	<	throw new NullPointerException();
4873	<	return new MapReduceMappingsToIntTask<K,V>
4874	<	(map, null, -1, null, transformer, basis, reducer);
4875	<	}
4876	<
4877	<	/**
4878	<	* Returns a task that when invoked, performs the given action
4879	<	* for each key.
4880	<	*
4881	<	* @param map the map
4882	<	* @param action the action
4883	<	* @return the task
4884	<	*/
4885	<	public static <K,V> ForkJoinTask<Void> forEachKey
4886	<	(ConcurrentHashMapV8<K,V> map,
4887	<	Action<K> action) {
4888	<	if (action == null) throw new NullPointerException();
4889	<	return new ForEachKeyTask<K,V>(map, null, -1, action);
4890	<	}
4891	<
4892	<	/**
4893	<	* Returns a task that when invoked, performs the given action
4894	<	* for each non-null transformation of each key.
4895	<	*
4896	<	* @param map the map
4897	<	* @param transformer a function returning the transformation
4898	<	* for an element, or null if there is no transformation (in
4899	<	* which case the action is not applied)
4900	<	* @param action the action
4901	<	* @return the task
4902	<	*/
4903	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4904	<	(ConcurrentHashMapV8<K,V> map,
4905	<	Fun<? super K, ? extends U> transformer,
4906	<	Action<U> action) {
4907	<	if (transformer == null || action == null)
4908	<	throw new NullPointerException();
4909	<	return new ForEachTransformedKeyTask<K,V,U>
4910	<	(map, null, -1, transformer, action);
4911	<	}
4912	<
4913	<	/**
4914	<	* Returns a task that when invoked, returns a non-null result
4915	<	* from applying the given search function on each key, or
4916	<	* null if none.  Upon success, further element processing is
4917	<	* suppressed and the results of any other parallel
4918	<	* invocations of the search function are ignored.
4919	<	*
4920	<	* @param map the map
4921	<	* @param searchFunction a function returning a non-null
4922	<	* result on success, else null
4923	<	* @return the task
4924	<	*/
4925	<	public static <K,V,U> ForkJoinTask<U> searchKeys
4926	<	(ConcurrentHashMapV8<K,V> map,
4927	<	Fun<? super K, ? extends U> searchFunction) {
4928	<	if (searchFunction == null) throw new NullPointerException();
4929	<	return new SearchKeysTask<K,V,U>
4930	<	(map, null, -1, searchFunction,
4931	<	new AtomicReference<U>());
4932	<	}
4933	<
4934	<	/**
4935	<	* Returns a task that when invoked, returns the result of
4936	<	* accumulating all keys using the given reducer to combine
4937	<	* values, or null if none.
4938	<	*
4939	<	* @param map the map
4940	<	* @param reducer a commutative associative combining function
4941	<	* @return the task
4942	<	*/
4943	<	public static <K,V> ForkJoinTask<K> reduceKeys
4944	<	(ConcurrentHashMapV8<K,V> map,
4945	<	BiFun<? super K, ? super K, ? extends K> reducer) {
4946	<	if (reducer == null) throw new NullPointerException();
4947	<	return new ReduceKeysTask<K,V>
4948	<	(map, null, -1, null, reducer);
4949	<	}
4950	<
4951	<	/**
4952	<	* Returns a task that when invoked, returns the result of
4953	<	* accumulating the given transformation of all keys using the given
4954	<	* reducer to combine values, or null if none.
4955	<	*
4956	<	* @param map the map
4957	<	* @param transformer a function returning the transformation
4958	<	* for an element, or null if there is no transformation (in
4959	<	* which case it is not combined).
4960	<	* @param reducer a commutative associative combining function
4961	<	* @return the task
4962	<	*/
4963	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
4964	<	(ConcurrentHashMapV8<K,V> map,
4965	<	Fun<? super K, ? extends U> transformer,
4966	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4967	<	if (transformer == null || reducer == null)
4968	<	throw new NullPointerException();
4969	<	return new MapReduceKeysTask<K,V,U>
4970	<	(map, null, -1, null, transformer, reducer);
4971	<	}
4972	<
4973	<	/**
4974	<	* Returns a task that when invoked, returns the result of
4975	<	* accumulating the given transformation of all keys using the given
4976	<	* reducer to combine values, and the given basis as an
4977	<	* identity value.
4978	<	*
4979	<	* @param map the map
4980	<	* @param transformer a function returning the transformation
4981	<	* for an element
4982	<	* @param basis the identity (initial default value) for the reduction
4983	<	* @param reducer a commutative associative combining function
4984	<	* @return the task
4985	<	*/
4986	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4987	<	(ConcurrentHashMapV8<K,V> map,
4988	<	ObjectToDouble<? super K> transformer,
4989	<	double basis,
4990	<	DoubleByDoubleToDouble reducer) {
4991	<	if (transformer == null || reducer == null)
4992	<	throw new NullPointerException();
4993	<	return new MapReduceKeysToDoubleTask<K,V>
4994	<	(map, null, -1, null, transformer, basis, reducer);
4995	<	}
4996	<
4997	<	/**
4998	<	* Returns a task that when invoked, returns the result of
4999	<	* accumulating the given transformation of all keys using the given
5000	<	* reducer to combine values, and the given basis as an
5001	<	* identity value.
5002	<	*
5003	<	* @param map the map
5004	<	* @param transformer a function returning the transformation
5005	<	* for an element
5006	<	* @param basis the identity (initial default value) for the reduction
5007	<	* @param reducer a commutative associative combining function
5008	<	* @return the task
5009	<	*/
5010	<	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
5011	<	(ConcurrentHashMapV8<K,V> map,
5012	<	ObjectToLong<? super K> transformer,
5013	<	long basis,
5014	<	LongByLongToLong reducer) {
5015	<	if (transformer == null || reducer == null)
5016	<	throw new NullPointerException();
5017	<	return new MapReduceKeysToLongTask<K,V>
5018	<	(map, null, -1, null, transformer, basis, reducer);
5019	<	}
5020	<
5021	<	/**
5022	<	* Returns a task that when invoked, returns the result of
5023	<	* accumulating the given transformation of all keys using the given
5024	<	* reducer to combine values, and the given basis as an
5025	<	* identity value.
5026	<	*
5027	<	* @param map the map
5028	<	* @param transformer a function returning the transformation
5029	<	* for an element
5030	<	* @param basis the identity (initial default value) for the reduction
5031	<	* @param reducer a commutative associative combining function
5032	<	* @return the task
5033	<	*/
5034	<	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
5035	<	(ConcurrentHashMapV8<K,V> map,
5036	<	ObjectToInt<? super K> transformer,
5037	<	int basis,
5038	<	IntByIntToInt reducer) {
5039	<	if (transformer == null || reducer == null)
5040	<	throw new NullPointerException();
5041	<	return new MapReduceKeysToIntTask<K,V>
5042	<	(map, null, -1, null, transformer, basis, reducer);
5043	<	}
5044	<
5045	<	/**
5046	<	* Returns a task that when invoked, performs the given action
5047	<	* for each value.
5048	<	*
5049	<	* @param map the map
5050	<	* @param action the action
5051	<	*/
5052	<	public static <K,V> ForkJoinTask<Void> forEachValue
5053	<	(ConcurrentHashMapV8<K,V> map,
5054	<	Action<V> action) {
5055	<	if (action == null) throw new NullPointerException();
5056	<	return new ForEachValueTask<K,V>(map, null, -1, action);
5057	<	}
5058	<
5059	<	/**
5060	<	* Returns a task that when invoked, performs the given action
5061	<	* for each non-null transformation of each value.
5062	<	*
5063	<	* @param map the map
5064	<	* @param transformer a function returning the transformation
5065	<	* for an element, or null if there is no transformation (in
5066	<	* which case the action is not applied)
5067	<	* @param action the action
5068	<	*/
5069	<	public static <K,V,U> ForkJoinTask<Void> forEachValue
5070	<	(ConcurrentHashMapV8<K,V> map,
5071	<	Fun<? super V, ? extends U> transformer,
5072	<	Action<U> action) {
5073	<	if (transformer == null || action == null)
5074	<	throw new NullPointerException();
5075	<	return new ForEachTransformedValueTask<K,V,U>
5076	<	(map, null, -1, transformer, action);
5077	<	}
5078	<
5079	<	/**
5080	<	* Returns a task that when invoked, returns a non-null result
5081	<	* from applying the given search function on each value, or
5082	<	* null if none.  Upon success, further element processing is
5083	<	* suppressed and the results of any other parallel
5084	<	* invocations of the search function are ignored.
5085	<	*
5086	<	* @param map the map
5087	<	* @param searchFunction a function returning a non-null
5088	<	* result on success, else null
5089	<	* @return the task
5090	<	*/
5091	<	public static <K,V,U> ForkJoinTask<U> searchValues
5092	<	(ConcurrentHashMapV8<K,V> map,
5093	<	Fun<? super V, ? extends U> searchFunction) {
5094	<	if (searchFunction == null) throw new NullPointerException();
5095	<	return new SearchValuesTask<K,V,U>
5096	<	(map, null, -1, searchFunction,
5097	<	new AtomicReference<U>());
5098	<	}
5099	<
5100	<	/**
5101	<	* Returns a task that when invoked, returns the result of
5102	<	* accumulating all values using the given reducer to combine
5103	<	* values, or null if none.
5104	<	*
5105	<	* @param map the map
5106	<	* @param reducer a commutative associative combining function
5107	<	* @return the task
5108	<	*/
5109	<	public static <K,V> ForkJoinTask<V> reduceValues
5110	<	(ConcurrentHashMapV8<K,V> map,
5111	<	BiFun<? super V, ? super V, ? extends V> reducer) {
5112	<	if (reducer == null) throw new NullPointerException();
5113	<	return new ReduceValuesTask<K,V>
5114	<	(map, null, -1, null, reducer);
5115	<	}
5116	<
5117	<	/**
5118	<	* Returns a task that when invoked, returns the result of
5119	<	* accumulating the given transformation of all values using the
5120	<	* given reducer to combine values, or null if none.
5121	<	*
5122	<	* @param map the map
5123	<	* @param transformer a function returning the transformation
5124	<	* for an element, or null if there is no transformation (in
5125	<	* which case it is not combined).
5126	<	* @param reducer a commutative associative combining function
5127	<	* @return the task
5128	<	*/
5129	<	public static <K,V,U> ForkJoinTask<U> reduceValues
5130	<	(ConcurrentHashMapV8<K,V> map,
5131	<	Fun<? super V, ? extends U> transformer,
5132	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5133	<	if (transformer == null || reducer == null)
5134	<	throw new NullPointerException();
5135	<	return new MapReduceValuesTask<K,V,U>
5136	<	(map, null, -1, null, transformer, reducer);
5137	<	}
5138	<
5139	<	/**
5140	<	* Returns a task that when invoked, returns the result of
5141	<	* accumulating the given transformation of all values using the
5142	<	* given reducer to combine values, and the given basis as an
5143	<	* identity value.
5144	<	*
5145	<	* @param map the map
5146	<	* @param transformer a function returning the transformation
5147	<	* for an element
5148	<	* @param basis the identity (initial default value) for the reduction
5149	<	* @param reducer a commutative associative combining function
5150	<	* @return the task
5151	<	*/
5152	<	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
5153	<	(ConcurrentHashMapV8<K,V> map,
5154	<	ObjectToDouble<? super V> transformer,
5155	<	double basis,
5156	<	DoubleByDoubleToDouble reducer) {
5157	<	if (transformer == null || reducer == null)
5158	<	throw new NullPointerException();
5159	<	return new MapReduceValuesToDoubleTask<K,V>
5160	<	(map, null, -1, null, transformer, basis, reducer);
5161	<	}
5162	<
5163	<	/**
5164	<	* Returns a task that when invoked, returns the result of
5165	<	* accumulating the given transformation of all values using the
5166	<	* given reducer to combine values, and the given basis as an
5167	<	* identity value.
5168	<	*
5169	<	* @param map the map
5170	<	* @param transformer a function returning the transformation
5171	<	* for an element
5172	<	* @param basis the identity (initial default value) for the reduction
5173	<	* @param reducer a commutative associative combining function
5174	<	* @return the task
5175	<	*/
5176	<	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
5177	<	(ConcurrentHashMapV8<K,V> map,
5178	<	ObjectToLong<? super V> transformer,
5179	<	long basis,
5180	<	LongByLongToLong reducer) {
5181	<	if (transformer == null || reducer == null)
5182	<	throw new NullPointerException();
5183	<	return new MapReduceValuesToLongTask<K,V>
5184	<	(map, null, -1, null, transformer, basis, reducer);
5185	<	}
5186	<
5187	<	/**
5188	<	* Returns a task that when invoked, returns the result of
5189	<	* accumulating the given transformation of all values using the
5190	<	* given reducer to combine values, and the given basis as an
5191	<	* identity value.
5192	<	*
5193	<	* @param map the map
5194	<	* @param transformer a function returning the transformation
5195	<	* for an element
5196	<	* @param basis the identity (initial default value) for the reduction
5197	<	* @param reducer a commutative associative combining function
5198	<	* @return the task
5199	<	*/
5200	<	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
5201	<	(ConcurrentHashMapV8<K,V> map,
5202	<	ObjectToInt<? super V> transformer,
5203	<	int basis,
5204	<	IntByIntToInt reducer) {
5205	<	if (transformer == null || reducer == null)
5206	<	throw new NullPointerException();
5207	<	return new MapReduceValuesToIntTask<K,V>
5208	<	(map, null, -1, null, transformer, basis, reducer);
5209	<	}
5210	<
5211	<	/**
5212	<	* Returns a task that when invoked, perform the given action
5213	<	* for each entry.
5214	<	*
5215	<	* @param map the map
5216	<	* @param action the action
5217	<	*/
5218	<	public static <K,V> ForkJoinTask<Void> forEachEntry
5219	<	(ConcurrentHashMapV8<K,V> map,
5220	<	Action<Map.Entry<K,V>> action) {
5221	<	if (action == null) throw new NullPointerException();
5222	<	return new ForEachEntryTask<K,V>(map, null, -1, action);
5223	<	}
5224	<
5225	<	/**
5226	<	* Returns a task that when invoked, perform the given action
5227	<	* for each non-null transformation of each entry.
5228	<	*
5229	<	* @param map the map
5230	<	* @param transformer a function returning the transformation
5231	<	* for an element, or null if there is no transformation (in
5232	<	* which case the action is not applied)
5233	<	* @param action the action
5234	<	*/
5235	<	public static <K,V,U> ForkJoinTask<Void> forEachEntry
5236	<	(ConcurrentHashMapV8<K,V> map,
5237	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5238	<	Action<U> action) {
5239	<	if (transformer == null || action == null)
5240	<	throw new NullPointerException();
5241	<	return new ForEachTransformedEntryTask<K,V,U>
5242	<	(map, null, -1, transformer, action);
5243	<	}
5244	<
5245	<	/**
5246	<	* Returns a task that when invoked, returns a non-null result
5247	<	* from applying the given search function on each entry, or
5248	<	* null if none.  Upon success, further element processing is
5249	<	* suppressed and the results of any other parallel
5250	<	* invocations of the search function are ignored.
5251	<	*
5252	<	* @param map the map
5253	<	* @param searchFunction a function returning a non-null
5254	<	* result on success, else null
5255	<	* @return the task
5256	<	*/
5257	<	public static <K,V,U> ForkJoinTask<U> searchEntries
5258	<	(ConcurrentHashMapV8<K,V> map,
5259	<	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
5260	<	if (searchFunction == null) throw new NullPointerException();
5261	<	return new SearchEntriesTask<K,V,U>
5262	<	(map, null, -1, searchFunction,
5263	<	new AtomicReference<U>());
5264	<	}
5265	<
5266	<	/**
5267	<	* Returns a task that when invoked, returns the result of
5268	<	* accumulating all entries using the given reducer to combine
5269	<	* values, or null if none.
5270	<	*
5271	<	* @param map the map
5272	<	* @param reducer a commutative associative combining function
5273	<	* @return the task
5274	<	*/
5275	<	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
5276	<	(ConcurrentHashMapV8<K,V> map,
5277	<	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5278	<	if (reducer == null) throw new NullPointerException();
5279	<	return new ReduceEntriesTask<K,V>
5280	<	(map, null, -1, null, reducer);
5281	<	}
5282	<
5283	<	/**
5284	<	* Returns a task that when invoked, returns the result of
5285	<	* accumulating the given transformation of all entries using the
5286	<	* given reducer to combine values, or null if none.
5287	<	*
5288	<	* @param map the map
5289	<	* @param transformer a function returning the transformation
5290	<	* for an element, or null if there is no transformation (in
5291	<	* which case it is not combined).
5292	<	* @param reducer a commutative associative combining function
5293	<	* @return the task
5294	<	*/
5295	<	public static <K,V,U> ForkJoinTask<U> reduceEntries
5296	<	(ConcurrentHashMapV8<K,V> map,
5297	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
5298	<	BiFun<? super U, ? super U, ? extends U> reducer) {
5299	<	if (transformer == null || reducer == null)
5300	<	throw new NullPointerException();
5301	<	return new MapReduceEntriesTask<K,V,U>
5302	<	(map, null, -1, null, transformer, reducer);
5303	<	}
5304	<
5305	<	/**
5306	<	* Returns a task that when invoked, returns the result of
5307	<	* accumulating the given transformation of all entries using the
5308	<	* given reducer to combine values, and the given basis as an
5309	<	* identity value.
5310	<	*
5311	<	* @param map the map
5312	<	* @param transformer a function returning the transformation
5313	<	* for an element
5314	<	* @param basis the identity (initial default value) for the reduction
5315	<	* @param reducer a commutative associative combining function
5316	<	* @return the task
5317	<	*/
5318	<	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
5319	<	(ConcurrentHashMapV8<K,V> map,
5320	<	ObjectToDouble<Map.Entry<K,V>> transformer,
5321	<	double basis,
5322	<	DoubleByDoubleToDouble reducer) {
5323	<	if (transformer == null || reducer == null)
5324	<	throw new NullPointerException();
5325	<	return new MapReduceEntriesToDoubleTask<K,V>
5326	<	(map, null, -1, null, transformer, basis, reducer);
5327	<	}
5328	<
5329	<	/**
5330	<	* Returns a task that when invoked, returns the result of
5331	<	* accumulating the given transformation of all entries using the
5332	<	* given reducer to combine values, and the given basis as an
5333	<	* identity value.
5334	<	*
5335	<	* @param map the map
5336	<	* @param transformer a function returning the transformation
5337	<	* for an element
5338	<	* @param basis the identity (initial default value) for the reduction
5339	<	* @param reducer a commutative associative combining function
5340	<	* @return the task
5341	<	*/
5342	<	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
5343	<	(ConcurrentHashMapV8<K,V> map,
5344	<	ObjectToLong<Map.Entry<K,V>> transformer,
5345	<	long basis,
5346	<	LongByLongToLong reducer) {
5347	<	if (transformer == null || reducer == null)
5348	<	throw new NullPointerException();
5349	<	return new MapReduceEntriesToLongTask<K,V>
5350	<	(map, null, -1, null, transformer, basis, reducer);
4549	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4550	>	Node<K,V>[] tab;        // same as Traverser
4551	>	Node<K,V> next;
4552	>	int index;
4553	>	int baseIndex;
4554	>	int baseLimit;
4555	>	final int baseSize;
4556	>	int batch;              // split control
4557	>
4558	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4559	>	super(par);
4560	>	this.batch = b;
4561	>	this.index = this.baseIndex = i;
4562	>	if ((this.tab = t) == null)
4563	>	this.baseSize = this.baseLimit = 0;
4564	>	else if (par == null)
4565	>	this.baseSize = this.baseLimit = t.length;
4566	>	else {
4567	>	this.baseLimit = f;
4568	>	this.baseSize = par.baseSize;
4569	>	}
4570		}
4571
4572		/**
4573	<	* Returns a task that when invoked, returns the result of
5355	<	* accumulating the given transformation of all entries using the
5356	<	* given reducer to combine values, and the given basis as an
5357	<	* identity value.
5358	<	*
5359	<	* @param map the map
5360	<	* @param transformer a function returning the transformation
5361	<	* for an element
5362	<	* @param basis the identity (initial default value) for the reduction
5363	<	* @param reducer a commutative associative combining function
5364	<	* @return the task
4573	>	* Same as Traverser version
4574		*/
4575	<	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
4576	<	(ConcurrentHashMapV8<K,V> map,
4577	<	ObjectToInt<Map.Entry<K,V>> transformer,
4578	<	int basis,
4579	<	IntByIntToInt reducer) {
4580	<	if (transformer == null || reducer == null)
4581	<	throw new NullPointerException();
4582	<	return new MapReduceEntriesToIntTask<K,V>
4583	<	(map, null, -1, null, transformer, basis, reducer);
4575	>	final Node<K,V> advance() {
4576	>	Node<K,V> e;
4577	>	if ((e = next) != null)
4578	>	e = e.next;
4579	>	for (;;) {
4580	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4581	>	if (e != null)
4582	>	return next = e;
4583	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4584	>	(n = t.length) <= (i = index) || i < 0)
4585	>	return next = null;
4586	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4587	>	if (e instanceof ForwardingNode) {
4588	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4589	>	e = null;
4590	>	continue;
4591	>	}
4592	>	else if (e instanceof TreeBin)
4593	>	e = ((TreeBin<K,V>)e).first;
4594	>	else
4595	>	e = null;
4596	>	}
4597	>	if ((index += baseSize) >= n)
4598	>	index = ++baseIndex;    // visit upper slots if present
4599	>	}
4600		}
4601		}
4602
5378	–	// -------------------------------------------------------
5379	–
4603		/*
4604		* Task classes. Coded in a regular but ugly format/style to
4605		* simplify checks that each variant differs in the right way from
4606	<	* others.
4607	<	*/
4608	<
4609	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4610	<	extends Traverser<K,V,Void> {
4611	<	final Action<K> action;
4606	>	* others. The null screenings exist because compilers cannot tell
4607	>	* that we've already null-checked task arguments, so we force
4608	>	* simplest hoisted bypass to help avoid convoluted traps.
4609	>	*/
4610	>	@SuppressWarnings("serial")
4611	>	static final class ForEachKeyTask<K,V>
4612	>	extends BulkTask<K,V,Void> {
4613	>	final Action<? super K> action;
4614		ForEachKeyTask
4615	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4616	<	Action<K> action) {
4617	<	super(m, p, b);
4615	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4616	>	Action<? super K> action) {
4617	>	super(p, b, i, f, t);
4618		this.action = action;
4619		}
4620	<	@SuppressWarnings("unchecked") public final void compute() {
4621	<	final Action<K> action;
4622	<	if ((action = this.action) == null)
4623	<	throw new NullPointerException();
4624	<	for (int b; (b = preSplit()) > 0;)
4625	<	new ForEachKeyTask<K,V>(map, this, b, action).fork();
4626	<	while (advance() != null)
4627	<	action.apply((K)nextKey);
4628	<	propagateCompletion();
4620	>	public final void compute() {
4621	>	final Action<? super K> action;
4622	>	if ((action = this.action) != null) {
4623	>	for (int i = baseIndex, f, h; batch > 0 &&
4624	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4625	>	addToPendingCount(1);
4626	>	new ForEachKeyTask<K,V>
4627	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4628	>	action).fork();
4629	>	}
4630	>	for (Node<K,V> p; (p = advance()) != null;)
4631	>	action.apply(p.key);
4632	>	propagateCompletion();
4633	>	}
4634		}
4635		}
4636
4637	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4638	<	extends Traverser<K,V,Void> {
4639	<	final Action<V> action;
4637	>	@SuppressWarnings("serial")
4638	>	static final class ForEachValueTask<K,V>
4639	>	extends BulkTask<K,V,Void> {
4640	>	final Action<? super V> action;
4641		ForEachValueTask
4642	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4643	<	Action<V> action) {
4644	<	super(m, p, b);
4642	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4643	>	Action<? super V> action) {
4644	>	super(p, b, i, f, t);
4645		this.action = action;
4646		}
4647	<	@SuppressWarnings("unchecked") public final void compute() {
4648	<	final Action<V> action;
4649	<	if ((action = this.action) == null)
4650	<	throw new NullPointerException();
4651	<	for (int b; (b = preSplit()) > 0;)
4652	<	new ForEachValueTask<K,V>(map, this, b, action).fork();
4653	<	Object v;
4654	<	while ((v = advance()) != null)
4655	<	action.apply((V)v);
4656	<	propagateCompletion();
4647	>	public final void compute() {
4648	>	final Action<? super V> action;
4649	>	if ((action = this.action) != null) {
4650	>	for (int i = baseIndex, f, h; batch > 0 &&
4651	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4652	>	addToPendingCount(1);
4653	>	new ForEachValueTask<K,V>
4654	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4655	>	action).fork();
4656	>	}
4657	>	for (Node<K,V> p; (p = advance()) != null;)
4658	>	action.apply(p.val);
4659	>	propagateCompletion();
4660	>	}
4661		}
4662		}
4663
4664	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4665	<	extends Traverser<K,V,Void> {
4666	<	final Action<Entry<K,V>> action;
4664	>	@SuppressWarnings("serial")
4665	>	static final class ForEachEntryTask<K,V>
4666	>	extends BulkTask<K,V,Void> {
4667	>	final Action<? super Entry<K,V>> action;
4668		ForEachEntryTask
4669	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4670	<	Action<Entry<K,V>> action) {
4671	<	super(m, p, b);
4669	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4670	>	Action<? super Entry<K,V>> action) {
4671	>	super(p, b, i, f, t);
4672		this.action = action;
4673		}
4674	<	@SuppressWarnings("unchecked") public final void compute() {
4675	<	final Action<Entry<K,V>> action;
4676	<	if ((action = this.action) == null)
4677	<	throw new NullPointerException();
4678	<	for (int b; (b = preSplit()) > 0;)
4679	<	new ForEachEntryTask<K,V>(map, this, b, action).fork();
4680	<	Object v;
4681	<	while ((v = advance()) != null)
4682	<	action.apply(entryFor((K)nextKey, (V)v));
4683	<	propagateCompletion();
4674	>	public final void compute() {
4675	>	final Action<? super Entry<K,V>> action;
4676	>	if ((action = this.action) != null) {
4677	>	for (int i = baseIndex, f, h; batch > 0 &&
4678	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4679	>	addToPendingCount(1);
4680	>	new ForEachEntryTask<K,V>
4681	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4682	>	action).fork();
4683	>	}
4684	>	for (Node<K,V> p; (p = advance()) != null; )
4685	>	action.apply(p);
4686	>	propagateCompletion();
4687	>	}
4688		}
4689		}
4690
4691	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4692	<	extends Traverser<K,V,Void> {
4693	<	final BiAction<K,V> action;
4691	>	@SuppressWarnings("serial")
4692	>	static final class ForEachMappingTask<K,V>
4693	>	extends BulkTask<K,V,Void> {
4694	>	final BiAction<? super K, ? super V> action;
4695		ForEachMappingTask
4696	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4697	<	BiAction<K,V> action) {
4698	<	super(m, p, b);
4696	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4697	>	BiAction<? super K,? super V> action) {
4698	>	super(p, b, i, f, t);
4699		this.action = action;
4700		}
4701	<	@SuppressWarnings("unchecked") public final void compute() {
4702	<	final BiAction<K,V> action;
4703	<	if ((action = this.action) == null)
4704	<	throw new NullPointerException();
4705	<	for (int b; (b = preSplit()) > 0;)
4706	<	new ForEachMappingTask<K,V>(map, this, b, action).fork();
4707	<	Object v;
4708	<	while ((v = advance()) != null)
4709	<	action.apply((K)nextKey, (V)v);
4710	<	propagateCompletion();
4701	>	public final void compute() {
4702	>	final BiAction<? super K, ? super V> action;
4703	>	if ((action = this.action) != null) {
4704	>	for (int i = baseIndex, f, h; batch > 0 &&
4705	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4706	>	addToPendingCount(1);
4707	>	new ForEachMappingTask<K,V>
4708	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4709	>	action).fork();
4710	>	}
4711	>	for (Node<K,V> p; (p = advance()) != null; )
4712	>	action.apply(p.key, p.val);
4713	>	propagateCompletion();
4714	>	}
4715		}
4716		}
4717
4718	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4719	<	extends Traverser<K,V,Void> {
4718	>	@SuppressWarnings("serial")
4719	>	static final class ForEachTransformedKeyTask<K,V,U>
4720	>	extends BulkTask<K,V,Void> {
4721		final Fun<? super K, ? extends U> transformer;
4722	<	final Action<U> action;
4722	>	final Action<? super U> action;
4723		ForEachTransformedKeyTask
4724	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4725	<	Fun<? super K, ? extends U> transformer, Action<U> action) {
4726	<	super(m, p, b);
4724	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4725	>	Fun<? super K, ? extends U> transformer, Action<? super U> action) {
4726	>	super(p, b, i, f, t);
4727		this.transformer = transformer; this.action = action;
4728		}
4729	<	@SuppressWarnings("unchecked") public final void compute() {
4729	>	public final void compute() {
4730		final Fun<? super K, ? extends U> transformer;
4731	<	final Action<U> action;
4732	<	if ((transformer = this.transformer) == null ||
4733	<	(action = this.action) == null)
4734	<	throw new NullPointerException();
4735	<	for (int b; (b = preSplit()) > 0;)
4736	<	new ForEachTransformedKeyTask<K,V,U>
4737	<	(map, this, b, transformer, action).fork();
4738	<	U u;
4739	<	while (advance() != null) {
4740	<	if ((u = transformer.apply((K)nextKey)) != null)
4741	<	action.apply(u);
4731	>	final Action<? super U> action;
4732	>	if ((transformer = this.transformer) != null &&
4733	>	(action = this.action) != null) {
4734	>	for (int i = baseIndex, f, h; batch > 0 &&
4735	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4736	>	addToPendingCount(1);
4737	>	new ForEachTransformedKeyTask<K,V,U>
4738	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4739	>	transformer, action).fork();
4740	>	}
4741	>	for (Node<K,V> p; (p = advance()) != null; ) {
4742	>	U u;
4743	>	if ((u = transformer.apply(p.key)) != null)
4744	>	action.apply(u);
4745	>	}
4746	>	propagateCompletion();
4747		}
5497	–	propagateCompletion();
4748		}
4749		}
4750
4751	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4752	<	extends Traverser<K,V,Void> {
4751	>	@SuppressWarnings("serial")
4752	>	static final class ForEachTransformedValueTask<K,V,U>
4753	>	extends BulkTask<K,V,Void> {
4754		final Fun<? super V, ? extends U> transformer;
4755	<	final Action<U> action;
4755	>	final Action<? super U> action;
4756		ForEachTransformedValueTask
4757	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4758	<	Fun<? super V, ? extends U> transformer, Action<U> action) {
4759	<	super(m, p, b);
4757	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4758	>	Fun<? super V, ? extends U> transformer, Action<? super U> action) {
4759	>	super(p, b, i, f, t);
4760		this.transformer = transformer; this.action = action;
4761		}
4762	<	@SuppressWarnings("unchecked") public final void compute() {
4762	>	public final void compute() {
4763		final Fun<? super V, ? extends U> transformer;
4764	<	final Action<U> action;
4765	<	if ((transformer = this.transformer) == null ||
4766	<	(action = this.action) == null)
4767	<	throw new NullPointerException();
4768	<	for (int b; (b = preSplit()) > 0;)
4769	<	new ForEachTransformedValueTask<K,V,U>
4770	<	(map, this, b, transformer, action).fork();
4771	<	Object v; U u;
4772	<	while ((v = advance()) != null) {
4773	<	if ((u = transformer.apply((V)v)) != null)
4774	<	action.apply(u);
4764	>	final Action<? super U> action;
4765	>	if ((transformer = this.transformer) != null &&
4766	>	(action = this.action) != null) {
4767	>	for (int i = baseIndex, f, h; batch > 0 &&
4768	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4769	>	addToPendingCount(1);
4770	>	new ForEachTransformedValueTask<K,V,U>
4771	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4772	>	transformer, action).fork();
4773	>	}
4774	>	for (Node<K,V> p; (p = advance()) != null; ) {
4775	>	U u;
4776	>	if ((u = transformer.apply(p.val)) != null)
4777	>	action.apply(u);
4778	>	}
4779	>	propagateCompletion();
4780		}
5525	–	propagateCompletion();
4781		}
4782		}
4783
4784	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4785	<	extends Traverser<K,V,Void> {
4784	>	@SuppressWarnings("serial")
4785	>	static final class ForEachTransformedEntryTask<K,V,U>
4786	>	extends BulkTask<K,V,Void> {
4787		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4788	<	final Action<U> action;
4788	>	final Action<? super U> action;
4789		ForEachTransformedEntryTask
4790	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4791	<	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<U> action) {
4792	<	super(m, p, b);
4790	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4791	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<? super U> action) {
4792	>	super(p, b, i, f, t);
4793		this.transformer = transformer; this.action = action;
4794		}
4795	<	@SuppressWarnings("unchecked") public final void compute() {
4795	>	public final void compute() {
4796		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4797	<	final Action<U> action;
4798	<	if ((transformer = this.transformer) == null ||
4799	<	(action = this.action) == null)
4800	<	throw new NullPointerException();
4801	<	for (int b; (b = preSplit()) > 0;)
4802	<	new ForEachTransformedEntryTask<K,V,U>
4803	<	(map, this, b, transformer, action).fork();
4804	<	Object v; U u;
4805	<	while ((v = advance()) != null) {
4806	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
4807	<	action.apply(u);
4797	>	final Action<? super U> action;
4798	>	if ((transformer = this.transformer) != null &&
4799	>	(action = this.action) != null) {
4800	>	for (int i = baseIndex, f, h; batch > 0 &&
4801	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4802	>	addToPendingCount(1);
4803	>	new ForEachTransformedEntryTask<K,V,U>
4804	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4805	>	transformer, action).fork();
4806	>	}
4807	>	for (Node<K,V> p; (p = advance()) != null; ) {
4808	>	U u;
4809	>	if ((u = transformer.apply(p)) != null)
4810	>	action.apply(u);
4811	>	}
4812	>	propagateCompletion();
4813		}
5553	–	propagateCompletion();
4814		}
4815		}
4816
4817	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4818	<	extends Traverser<K,V,Void> {
4817	>	@SuppressWarnings("serial")
4818	>	static final class ForEachTransformedMappingTask<K,V,U>
4819	>	extends BulkTask<K,V,Void> {
4820		final BiFun<? super K, ? super V, ? extends U> transformer;
4821	<	final Action<U> action;
4821	>	final Action<? super U> action;
4822		ForEachTransformedMappingTask
4823	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4823	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4824		BiFun<? super K, ? super V, ? extends U> transformer,
4825	<	Action<U> action) {
4826	<	super(m, p, b);
4825	>	Action<? super U> action) {
4826	>	super(p, b, i, f, t);
4827		this.transformer = transformer; this.action = action;
4828		}
4829	<	@SuppressWarnings("unchecked") public final void compute() {
4829	>	public final void compute() {
4830		final BiFun<? super K, ? super V, ? extends U> transformer;
4831	<	final Action<U> action;
4832	<	if ((transformer = this.transformer) == null ||
4833	<	(action = this.action) == null)
4834	<	throw new NullPointerException();
4835	<	for (int b; (b = preSplit()) > 0;)
4836	<	new ForEachTransformedMappingTask<K,V,U>
4837	<	(map, this, b, transformer, action).fork();
4838	<	Object v; U u;
4839	<	while ((v = advance()) != null) {
4840	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
4841	<	action.apply(u);
4831	>	final Action<? super U> action;
4832	>	if ((transformer = this.transformer) != null &&
4833	>	(action = this.action) != null) {
4834	>	for (int i = baseIndex, f, h; batch > 0 &&
4835	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4836	>	addToPendingCount(1);
4837	>	new ForEachTransformedMappingTask<K,V,U>
4838	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4839	>	transformer, action).fork();
4840	>	}
4841	>	for (Node<K,V> p; (p = advance()) != null; ) {
4842	>	U u;
4843	>	if ((u = transformer.apply(p.key, p.val)) != null)
4844	>	action.apply(u);
4845	>	}
4846	>	propagateCompletion();
4847		}
5582	–	propagateCompletion();
4848		}
4849		}
4850
4851	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4852	<	extends Traverser<K,V,U> {
4851	>	@SuppressWarnings("serial")
4852	>	static final class SearchKeysTask<K,V,U>
4853	>	extends BulkTask<K,V,U> {
4854		final Fun<? super K, ? extends U> searchFunction;
4855		final AtomicReference<U> result;
4856		SearchKeysTask
4857	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4857	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4858		Fun<? super K, ? extends U> searchFunction,
4859		AtomicReference<U> result) {
4860	<	super(m, p, b);
4860	>	super(p, b, i, f, t);
4861		this.searchFunction = searchFunction; this.result = result;
4862		}
4863		public final U getRawResult() { return result.get(); }
4864	<	@SuppressWarnings("unchecked") public final void compute() {
4864	>	public final void compute() {
4865		final Fun<? super K, ? extends U> searchFunction;
4866		final AtomicReference<U> result;
4867	<	if ((searchFunction = this.searchFunction) == null ||
4868	<	(result = this.result) == null)
4869	<	throw new NullPointerException();
4870	<	for (int b;;) {
4871	<	if (result.get() != null)
4872	<	return;
4873	<	if ((b = preSplit()) <= 0)
4874	<	break;
4875	<	new SearchKeysTask<K,V,U>
4876	<	(map, this, b, searchFunction, result).fork();
4877	<	}
4878	<	while (result.get() == null) {
4879	<	U u;
4880	<	if (advance() == null) {
4881	<	propagateCompletion();
4882	<	break;
4883	<	}
4884	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
4885	<	if (result.compareAndSet(null, u))
4886	<	quietlyCompleteRoot();
4887	<	break;
4867	>	if ((searchFunction = this.searchFunction) != null &&
4868	>	(result = this.result) != null) {
4869	>	for (int i = baseIndex, f, h; batch > 0 &&
4870	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4871	>	if (result.get() != null)
4872	>	return;
4873	>	addToPendingCount(1);
4874	>	new SearchKeysTask<K,V,U>
4875	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4876	>	searchFunction, result).fork();
4877	>	}
4878	>	while (result.get() == null) {
4879	>	U u;
4880	>	Node<K,V> p;
4881	>	if ((p = advance()) == null) {
4882	>	propagateCompletion();
4883	>	break;
4884	>	}
4885	>	if ((u = searchFunction.apply(p.key)) != null) {
4886	>	if (result.compareAndSet(null, u))
4887	>	quietlyCompleteRoot();
4888	>	break;
4889	>	}
4890		}
4891		}
4892		}
4893		}
4894
4895	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
4896	<	extends Traverser<K,V,U> {
4895	>	@SuppressWarnings("serial")
4896	>	static final class SearchValuesTask<K,V,U>
4897	>	extends BulkTask<K,V,U> {
4898		final Fun<? super V, ? extends U> searchFunction;
4899		final AtomicReference<U> result;
4900		SearchValuesTask
4901	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4901	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4902		Fun<? super V, ? extends U> searchFunction,
4903		AtomicReference<U> result) {
4904	<	super(m, p, b);
4904	>	super(p, b, i, f, t);
4905		this.searchFunction = searchFunction; this.result = result;
4906		}
4907		public final U getRawResult() { return result.get(); }
4908	<	@SuppressWarnings("unchecked") public final void compute() {
4908	>	public final void compute() {
4909		final Fun<? super V, ? extends U> searchFunction;
4910		final AtomicReference<U> result;
4911	<	if ((searchFunction = this.searchFunction) == null ||
4912	<	(result = this.result) == null)
4913	<	throw new NullPointerException();
4914	<	for (int b;;) {
4915	<	if (result.get() != null)
4916	<	return;
4917	<	if ((b = preSplit()) <= 0)
4918	<	break;
4919	<	new SearchValuesTask<K,V,U>
4920	<	(map, this, b, searchFunction, result).fork();
4921	<	}
4922	<	while (result.get() == null) {
4923	<	Object v; U u;
4924	<	if ((v = advance()) == null) {
4925	<	propagateCompletion();
4926	<	break;
4927	<	}
4928	<	if ((u = searchFunction.apply((V)v)) != null) {
4929	<	if (result.compareAndSet(null, u))
4930	<	quietlyCompleteRoot();
4931	<	break;
4911	>	if ((searchFunction = this.searchFunction) != null &&
4912	>	(result = this.result) != null) {
4913	>	for (int i = baseIndex, f, h; batch > 0 &&
4914	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4915	>	if (result.get() != null)
4916	>	return;
4917	>	addToPendingCount(1);
4918	>	new SearchValuesTask<K,V,U>
4919	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4920	>	searchFunction, result).fork();
4921	>	}
4922	>	while (result.get() == null) {
4923	>	U u;
4924	>	Node<K,V> p;
4925	>	if ((p = advance()) == null) {
4926	>	propagateCompletion();
4927	>	break;
4928	>	}
4929	>	if ((u = searchFunction.apply(p.val)) != null) {
4930	>	if (result.compareAndSet(null, u))
4931	>	quietlyCompleteRoot();
4932	>	break;
4933	>	}
4934		}
4935		}
4936		}
4937		}
4938
4939	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
4940	<	extends Traverser<K,V,U> {
4939	>	@SuppressWarnings("serial")
4940	>	static final class SearchEntriesTask<K,V,U>
4941	>	extends BulkTask<K,V,U> {
4942		final Fun<Entry<K,V>, ? extends U> searchFunction;
4943		final AtomicReference<U> result;
4944		SearchEntriesTask
4945	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4945	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4946		Fun<Entry<K,V>, ? extends U> searchFunction,
4947		AtomicReference<U> result) {
4948	<	super(m, p, b);
4948	>	super(p, b, i, f, t);
4949		this.searchFunction = searchFunction; this.result = result;
4950		}
4951		public final U getRawResult() { return result.get(); }
4952	<	@SuppressWarnings("unchecked") public final void compute() {
4952	>	public final void compute() {
4953		final Fun<Entry<K,V>, ? extends U> searchFunction;
4954		final AtomicReference<U> result;
4955	<	if ((searchFunction = this.searchFunction) == null ||
4956	<	(result = this.result) == null)
4957	<	throw new NullPointerException();
4958	<	for (int b;;) {
4959	<	if (result.get() != null)
4960	<	return;
4961	<	if ((b = preSplit()) <= 0)
4962	<	break;
4963	<	new SearchEntriesTask<K,V,U>
4964	<	(map, this, b, searchFunction, result).fork();
4965	<	}
4966	<	while (result.get() == null) {
4967	<	Object v; U u;
4968	<	if ((v = advance()) == null) {
4969	<	propagateCompletion();
4970	<	break;
4971	<	}
4972	<	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
4973	<	if (result.compareAndSet(null, u))
4974	<	quietlyCompleteRoot();
4975	<	return;
4955	>	if ((searchFunction = this.searchFunction) != null &&
4956	>	(result = this.result) != null) {
4957	>	for (int i = baseIndex, f, h; batch > 0 &&
4958	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4959	>	if (result.get() != null)
4960	>	return;
4961	>	addToPendingCount(1);
4962	>	new SearchEntriesTask<K,V,U>
4963	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4964	>	searchFunction, result).fork();
4965	>	}
4966	>	while (result.get() == null) {
4967	>	U u;
4968	>	Node<K,V> p;
4969	>	if ((p = advance()) == null) {
4970	>	propagateCompletion();
4971	>	break;
4972	>	}
4973	>	if ((u = searchFunction.apply(p)) != null) {
4974	>	if (result.compareAndSet(null, u))
4975	>	quietlyCompleteRoot();
4976	>	return;
4977	>	}
4978		}
4979		}
4980		}
4981		}
4982
4983	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
4984	<	extends Traverser<K,V,U> {
4983	>	@SuppressWarnings("serial")
4984	>	static final class SearchMappingsTask<K,V,U>
4985	>	extends BulkTask<K,V,U> {
4986		final BiFun<? super K, ? super V, ? extends U> searchFunction;
4987		final AtomicReference<U> result;
4988		SearchMappingsTask
4989	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4989	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4990		BiFun<? super K, ? super V, ? extends U> searchFunction,
4991		AtomicReference<U> result) {
4992	<	super(m, p, b);
4992	>	super(p, b, i, f, t);
4993		this.searchFunction = searchFunction; this.result = result;
4994		}
4995		public final U getRawResult() { return result.get(); }
4996	<	@SuppressWarnings("unchecked") public final void compute() {
4996	>	public final void compute() {
4997		final BiFun<? super K, ? super V, ? extends U> searchFunction;
4998		final AtomicReference<U> result;
4999	<	if ((searchFunction = this.searchFunction) == null ||
5000	<	(result = this.result) == null)
5001	<	throw new NullPointerException();
5002	<	for (int b;;) {
5003	<	if (result.get() != null)
5004	<	return;
5005	<	if ((b = preSplit()) <= 0)
5006	<	break;
5007	<	new SearchMappingsTask<K,V,U>
5008	<	(map, this, b, searchFunction, result).fork();
5009	<	}
5010	<	while (result.get() == null) {
5011	<	Object v; U u;
5012	<	if ((v = advance()) == null) {
5013	<	propagateCompletion();
5014	<	break;
5015	<	}
5016	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5017	<	if (result.compareAndSet(null, u))
5018	<	quietlyCompleteRoot();
5019	<	break;
4999	>	if ((searchFunction = this.searchFunction) != null &&
5000	>	(result = this.result) != null) {
5001	>	for (int i = baseIndex, f, h; batch > 0 &&
5002	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5003	>	if (result.get() != null)
5004	>	return;
5005	>	addToPendingCount(1);
5006	>	new SearchMappingsTask<K,V,U>
5007	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5008	>	searchFunction, result).fork();
5009	>	}
5010	>	while (result.get() == null) {
5011	>	U u;
5012	>	Node<K,V> p;
5013	>	if ((p = advance()) == null) {
5014	>	propagateCompletion();
5015	>	break;
5016	>	}
5017	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5018	>	if (result.compareAndSet(null, u))
5019	>	quietlyCompleteRoot();
5020	>	break;
5021	>	}
5022		}
5023		}
5024		}
5025		}
5026
5027	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5028	<	extends Traverser<K,V,K> {
5027	>	@SuppressWarnings("serial")
5028	>	static final class ReduceKeysTask<K,V>
5029	>	extends BulkTask<K,V,K> {
5030		final BiFun<? super K, ? super K, ? extends K> reducer;
5031		K result;
5032		ReduceKeysTask<K,V> rights, nextRight;
5033		ReduceKeysTask
5034	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5034	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5035		ReduceKeysTask<K,V> nextRight,
5036		BiFun<? super K, ? super K, ? extends K> reducer) {
5037	<	super(m, p, b); this.nextRight = nextRight;
5037	>	super(p, b, i, f, t); this.nextRight = nextRight;
5038		this.reducer = reducer;
5039		}
5040		public final K getRawResult() { return result; }
5041	<	@SuppressWarnings("unchecked") public final void compute() {
5042	<	final BiFun<? super K, ? super K, ? extends K> reducer =
5043	<	this.reducer;
5044	<	if (reducer == null)
5045	<	throw new NullPointerException();
5046	<	for (int b; (b = preSplit()) > 0;)
5047	<	(rights = new ReduceKeysTask<K,V>
5048	<	(map, this, b, rights, reducer)).fork();
5049	<	K r = null;
5050	<	while (advance() != null) {
5051	<	K u = (K)nextKey;
5052	<	r = (r == null) ? u : reducer.apply(r, u);
5053	<	}
5054	<	result = r;
5055	<	CountedCompleter<?> c;
5056	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5057	<	ReduceKeysTask<K,V>
5058	<	t = (ReduceKeysTask<K,V>)c,
5059	<	s = t.rights;
5060	<	while (s != null) {
5061	<	K tr, sr;
5062	<	if ((sr = s.result) != null)
5063	<	t.result = (((tr = t.result) == null) ? sr :
5064	<	reducer.apply(tr, sr));
5065	<	s = t.rights = s.nextRight;
5041	>	public final void compute() {
5042	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5043	>	if ((reducer = this.reducer) != null) {
5044	>	for (int i = baseIndex, f, h; batch > 0 &&
5045	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5046	>	addToPendingCount(1);
5047	>	(rights = new ReduceKeysTask<K,V>
5048	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5049	>	rights, reducer)).fork();
5050	>	}
5051	>	K r = null;
5052	>	for (Node<K,V> p; (p = advance()) != null; ) {
5053	>	K u = p.key;
5054	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5055	>	}
5056	>	result = r;
5057	>	CountedCompleter<?> c;
5058	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5059	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5060	>	t = (ReduceKeysTask<K,V>)c,
5061	>	s = t.rights;
5062	>	while (s != null) {
5063	>	K tr, sr;
5064	>	if ((sr = s.result) != null)
5065	>	t.result = (((tr = t.result) == null) ? sr :
5066	>	reducer.apply(tr, sr));
5067	>	s = t.rights = s.nextRight;
5068	>	}
5069		}
5070		}
5071		}
5072		}
5073
5074	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5075	<	extends Traverser<K,V,V> {
5074	>	@SuppressWarnings("serial")
5075	>	static final class ReduceValuesTask<K,V>
5076	>	extends BulkTask<K,V,V> {
5077		final BiFun<? super V, ? super V, ? extends V> reducer;
5078		V result;
5079		ReduceValuesTask<K,V> rights, nextRight;
5080		ReduceValuesTask
5081	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5081	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5082		ReduceValuesTask<K,V> nextRight,
5083		BiFun<? super V, ? super V, ? extends V> reducer) {
5084	<	super(m, p, b); this.nextRight = nextRight;
5084	>	super(p, b, i, f, t); this.nextRight = nextRight;
5085		this.reducer = reducer;
5086		}
5087		public final V getRawResult() { return result; }
5088	<	@SuppressWarnings("unchecked") public final void compute() {
5089	<	final BiFun<? super V, ? super V, ? extends V> reducer =
5090	<	this.reducer;
5091	<	if (reducer == null)
5092	<	throw new NullPointerException();
5093	<	for (int b; (b = preSplit()) > 0;)
5094	<	(rights = new ReduceValuesTask<K,V>
5095	<	(map, this, b, rights, reducer)).fork();
5096	<	V r = null;
5097	<	Object v;
5098	<	while ((v = advance()) != null) {
5099	<	V u = (V)v;
5100	<	r = (r == null) ? u : reducer.apply(r, u);
5101	<	}
5102	<	result = r;
5103	<	CountedCompleter<?> c;
5104	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5105	<	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;
5088	>	public final void compute() {
5089	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5090	>	if ((reducer = this.reducer) != null) {
5091	>	for (int i = baseIndex, f, h; batch > 0 &&
5092	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5093	>	addToPendingCount(1);
5094	>	(rights = new ReduceValuesTask<K,V>
5095	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5096	>	rights, reducer)).fork();
5097	>	}
5098	>	V r = null;
5099	>	for (Node<K,V> p; (p = advance()) != null; ) {
5100	>	V v = p.val;
5101	>	r = (r == null) ? v : reducer.apply(r, v);
5102	>	}
5103	>	result = r;
5104	>	CountedCompleter<?> c;
5105	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5106	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5107	>	t = (ReduceValuesTask<K,V>)c,
5108	>	s = t.rights;
5109	>	while (s != null) {
5110	>	V tr, sr;
5111	>	if ((sr = s.result) != null)
5112	>	t.result = (((tr = t.result) == null) ? sr :
5113	>	reducer.apply(tr, sr));
5114	>	s = t.rights = s.nextRight;
5115	>	}
5116		}
5117		}
5118		}
5119		}
5120
5121	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5122	<	extends Traverser<K,V,Map.Entry<K,V>> {
5121	>	@SuppressWarnings("serial")
5122	>	static final class ReduceEntriesTask<K,V>
5123	>	extends BulkTask<K,V,Map.Entry<K,V>> {
5124		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5125		Map.Entry<K,V> result;
5126		ReduceEntriesTask<K,V> rights, nextRight;
5127		ReduceEntriesTask
5128	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5128	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5129		ReduceEntriesTask<K,V> nextRight,
5130		BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5131	<	super(m, p, b); this.nextRight = nextRight;
5131	>	super(p, b, i, f, t); this.nextRight = nextRight;
5132		this.reducer = reducer;
5133		}
5134		public final Map.Entry<K,V> getRawResult() { return result; }
5135	<	@SuppressWarnings("unchecked") public final void compute() {
5136	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5137	<	this.reducer;
5138	<	if (reducer == null)
5139	<	throw new NullPointerException();
5140	<	for (int b; (b = preSplit()) > 0;)
5141	<	(rights = new ReduceEntriesTask<K,V>
5142	<	(map, this, b, rights, reducer)).fork();
5143	<	Map.Entry<K,V> r = null;
5144	<	Object v;
5145	<	while ((v = advance()) != null) {
5146	<	Map.Entry<K,V> u = entryFor((K)nextKey, (V)v);
5147	<	r = (r == null) ? u : reducer.apply(r, u);
5148	<	}
5149	<	result = r;
5150	<	CountedCompleter<?> c;
5151	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5152	<	ReduceEntriesTask<K,V>
5153	<	t = (ReduceEntriesTask<K,V>)c,
5154	<	s = t.rights;
5155	<	while (s != null) {
5156	<	Map.Entry<K,V> tr, sr;
5157	<	if ((sr = s.result) != null)
5158	<	t.result = (((tr = t.result) == null) ? sr :
5159	<	reducer.apply(tr, sr));
5160	<	s = t.rights = s.nextRight;
5135	>	public final void compute() {
5136	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5137	>	if ((reducer = this.reducer) != null) {
5138	>	for (int i = baseIndex, f, h; batch > 0 &&
5139	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5140	>	addToPendingCount(1);
5141	>	(rights = new ReduceEntriesTask<K,V>
5142	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5143	>	rights, reducer)).fork();
5144	>	}
5145	>	Map.Entry<K,V> r = null;
5146	>	for (Node<K,V> p; (p = advance()) != null; )
5147	>	r = (r == null) ? p : reducer.apply(r, p);
5148	>	result = r;
5149	>	CountedCompleter<?> c;
5150	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5151	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5152	>	t = (ReduceEntriesTask<K,V>)c,
5153	>	s = t.rights;
5154	>	while (s != null) {
5155	>	Map.Entry<K,V> tr, sr;
5156	>	if ((sr = s.result) != null)
5157	>	t.result = (((tr = t.result) == null) ? sr :
5158	>	reducer.apply(tr, sr));
5159	>	s = t.rights = s.nextRight;
5160	>	}
5161		}
5162		}
5163		}
5164		}
5165
5166	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5167	<	extends Traverser<K,V,U> {
5166	>	@SuppressWarnings("serial")
5167	>	static final class MapReduceKeysTask<K,V,U>
5168	>	extends BulkTask<K,V,U> {
5169		final Fun<? super K, ? extends U> transformer;
5170		final BiFun<? super U, ? super U, ? extends U> reducer;
5171		U result;
5172		MapReduceKeysTask<K,V,U> rights, nextRight;
5173		MapReduceKeysTask
5174	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5174	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5175		MapReduceKeysTask<K,V,U> nextRight,
5176		Fun<? super K, ? extends U> transformer,
5177		BiFun<? super U, ? super U, ? extends U> reducer) {
5178	<	super(m, p, b); this.nextRight = nextRight;
5178	>	super(p, b, i, f, t); this.nextRight = nextRight;
5179		this.transformer = transformer;
5180		this.reducer = reducer;
5181		}
5182		public final U getRawResult() { return result; }
5183	<	@SuppressWarnings("unchecked") public final void compute() {
5184	<	final Fun<? super K, ? extends U> transformer =
5185	<	this.transformer;
5186	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5187	<	this.reducer;
5188	<	if (transformer == null || reducer == null)
5189	<	throw new NullPointerException();
5190	<	for (int b; (b = preSplit()) > 0;)
5191	<	(rights = new MapReduceKeysTask<K,V,U>
5192	<	(map, this, b, rights, transformer, reducer)).fork();
5193	<	U r = null, u;
5194	<	while (advance() != null) {
5195	<	if ((u = transformer.apply((K)nextKey)) != null)
5196	<	r = (r == null) ? u : reducer.apply(r, u);
5197	<	}
5198	<	result = r;
5199	<	CountedCompleter<?> c;
5200	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5201	<	MapReduceKeysTask<K,V,U>
5202	<	t = (MapReduceKeysTask<K,V,U>)c,
5203	<	s = t.rights;
5204	<	while (s != null) {
5205	<	U tr, sr;
5206	<	if ((sr = s.result) != null)
5207	<	t.result = (((tr = t.result) == null) ? sr :
5208	<	reducer.apply(tr, sr));
5209	<	s = t.rights = s.nextRight;
5183	>	public final void compute() {
5184	>	final Fun<? super K, ? extends U> transformer;
5185	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5186	>	if ((transformer = this.transformer) != null &&
5187	>	(reducer = this.reducer) != null) {
5188	>	for (int i = baseIndex, f, h; batch > 0 &&
5189	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5190	>	addToPendingCount(1);
5191	>	(rights = new MapReduceKeysTask<K,V,U>
5192	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5193	>	rights, transformer, reducer)).fork();
5194	>	}
5195	>	U r = null;
5196	>	for (Node<K,V> p; (p = advance()) != null; ) {
5197	>	U u;
5198	>	if ((u = transformer.apply(p.key)) != null)
5199	>	r = (r == null) ? u : reducer.apply(r, u);
5200	>	}
5201	>	result = r;
5202	>	CountedCompleter<?> c;
5203	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5204	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5205	>	t = (MapReduceKeysTask<K,V,U>)c,
5206	>	s = t.rights;
5207	>	while (s != null) {
5208	>	U tr, sr;
5209	>	if ((sr = s.result) != null)
5210	>	t.result = (((tr = t.result) == null) ? sr :
5211	>	reducer.apply(tr, sr));
5212	>	s = t.rights = s.nextRight;
5213	>	}
5214		}
5215		}
5216		}
5217		}
5218
5219	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5220	<	extends Traverser<K,V,U> {
5219	>	@SuppressWarnings("serial")
5220	>	static final class MapReduceValuesTask<K,V,U>
5221	>	extends BulkTask<K,V,U> {
5222		final Fun<? super V, ? extends U> transformer;
5223		final BiFun<? super U, ? super U, ? extends U> reducer;
5224		U result;
5225		MapReduceValuesTask<K,V,U> rights, nextRight;
5226		MapReduceValuesTask
5227	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5227	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5228		MapReduceValuesTask<K,V,U> nextRight,
5229		Fun<? super V, ? extends U> transformer,
5230		BiFun<? super U, ? super U, ? extends U> reducer) {
5231	<	super(m, p, b); this.nextRight = nextRight;
5231	>	super(p, b, i, f, t); this.nextRight = nextRight;
5232		this.transformer = transformer;
5233		this.reducer = reducer;
5234		}
5235		public final U getRawResult() { return result; }
5236	<	@SuppressWarnings("unchecked") public final void compute() {
5237	<	final Fun<? super V, ? extends U> transformer =
5238	<	this.transformer;
5239	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5240	<	this.reducer;
5241	<	if (transformer == null || reducer == null)
5242	<	throw new NullPointerException();
5243	<	for (int b; (b = preSplit()) > 0;)
5244	<	(rights = new MapReduceValuesTask<K,V,U>
5245	<	(map, this, b, rights, transformer, reducer)).fork();
5246	<	U r = null, u;
5247	<	Object v;
5248	<	while ((v = advance()) != null) {
5249	<	if ((u = transformer.apply((V)v)) != null)
5250	<	r = (r == null) ? u : reducer.apply(r, u);
5251	<	}
5252	<	result = r;
5253	<	CountedCompleter<?> c;
5254	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5255	<	MapReduceValuesTask<K,V,U>
5256	<	t = (MapReduceValuesTask<K,V,U>)c,
5257	<	s = t.rights;
5258	<	while (s != null) {
5259	<	U tr, sr;
5260	<	if ((sr = s.result) != null)
5261	<	t.result = (((tr = t.result) == null) ? sr :
5262	<	reducer.apply(tr, sr));
5263	<	s = t.rights = s.nextRight;
5236	>	public final void compute() {
5237	>	final Fun<? super V, ? extends U> transformer;
5238	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5239	>	if ((transformer = this.transformer) != null &&
5240	>	(reducer = this.reducer) != null) {
5241	>	for (int i = baseIndex, f, h; batch > 0 &&
5242	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5243	>	addToPendingCount(1);
5244	>	(rights = new MapReduceValuesTask<K,V,U>
5245	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5246	>	rights, transformer, reducer)).fork();
5247	>	}
5248	>	U r = null;
5249	>	for (Node<K,V> p; (p = advance()) != null; ) {
5250	>	U u;
5251	>	if ((u = transformer.apply(p.val)) != null)
5252	>	r = (r == null) ? u : reducer.apply(r, u);
5253	>	}
5254	>	result = r;
5255	>	CountedCompleter<?> c;
5256	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5257	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5258	>	t = (MapReduceValuesTask<K,V,U>)c,
5259	>	s = t.rights;
5260	>	while (s != null) {
5261	>	U tr, sr;
5262	>	if ((sr = s.result) != null)
5263	>	t.result = (((tr = t.result) == null) ? sr :
5264	>	reducer.apply(tr, sr));
5265	>	s = t.rights = s.nextRight;
5266	>	}
5267		}
5268		}
5269		}
5270		}
5271
5272	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5273	<	extends Traverser<K,V,U> {
5272	>	@SuppressWarnings("serial")
5273	>	static final class MapReduceEntriesTask<K,V,U>
5274	>	extends BulkTask<K,V,U> {
5275		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5276		final BiFun<? super U, ? super U, ? extends U> reducer;
5277		U result;
5278		MapReduceEntriesTask<K,V,U> rights, nextRight;
5279		MapReduceEntriesTask
5280	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5280	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5281		MapReduceEntriesTask<K,V,U> nextRight,
5282		Fun<Map.Entry<K,V>, ? extends U> transformer,
5283		BiFun<? super U, ? super U, ? extends U> reducer) {
5284	<	super(m, p, b); this.nextRight = nextRight;
5284	>	super(p, b, i, f, t); this.nextRight = nextRight;
5285		this.transformer = transformer;
5286		this.reducer = reducer;
5287		}
5288		public final U getRawResult() { return result; }
5289	<	@SuppressWarnings("unchecked") public final void compute() {
5290	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5291	<	this.transformer;
5292	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5293	<	this.reducer;
5294	<	if (transformer == null || reducer == null)
5295	<	throw new NullPointerException();
5296	<	for (int b; (b = preSplit()) > 0;)
5297	<	(rights = new MapReduceEntriesTask<K,V,U>
5298	<	(map, this, b, rights, transformer, reducer)).fork();
5299	<	U r = null, u;
5300	<	Object v;
5301	<	while ((v = advance()) != null) {
5302	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5303	<	r = (r == null) ? u : reducer.apply(r, u);
5304	<	}
5305	<	result = r;
5306	<	CountedCompleter<?> c;
5307	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5308	<	MapReduceEntriesTask<K,V,U>
5309	<	t = (MapReduceEntriesTask<K,V,U>)c,
5310	<	s = t.rights;
5311	<	while (s != null) {
5312	<	U tr, sr;
5313	<	if ((sr = s.result) != null)
5314	<	t.result = (((tr = t.result) == null) ? sr :
5315	<	reducer.apply(tr, sr));
5316	<	s = t.rights = s.nextRight;
5289	>	public final void compute() {
5290	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5291	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5292	>	if ((transformer = this.transformer) != null &&
5293	>	(reducer = this.reducer) != null) {
5294	>	for (int i = baseIndex, f, h; batch > 0 &&
5295	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5296	>	addToPendingCount(1);
5297	>	(rights = new MapReduceEntriesTask<K,V,U>
5298	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5299	>	rights, transformer, reducer)).fork();
5300	>	}
5301	>	U r = null;
5302	>	for (Node<K,V> p; (p = advance()) != null; ) {
5303	>	U u;
5304	>	if ((u = transformer.apply(p)) != null)
5305	>	r = (r == null) ? u : reducer.apply(r, u);
5306	>	}
5307	>	result = r;
5308	>	CountedCompleter<?> c;
5309	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5310	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5311	>	t = (MapReduceEntriesTask<K,V,U>)c,
5312	>	s = t.rights;
5313	>	while (s != null) {
5314	>	U tr, sr;
5315	>	if ((sr = s.result) != null)
5316	>	t.result = (((tr = t.result) == null) ? sr :
5317	>	reducer.apply(tr, sr));
5318	>	s = t.rights = s.nextRight;
5319	>	}
5320		}
5321		}
5322		}
5323		}
5324
5325	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5326	<	extends Traverser<K,V,U> {
5325	>	@SuppressWarnings("serial")
5326	>	static final class MapReduceMappingsTask<K,V,U>
5327	>	extends BulkTask<K,V,U> {
5328		final BiFun<? super K, ? super V, ? extends U> transformer;
5329		final BiFun<? super U, ? super U, ? extends U> reducer;
5330		U result;
5331		MapReduceMappingsTask<K,V,U> rights, nextRight;
5332		MapReduceMappingsTask
5333	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5333	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5334		MapReduceMappingsTask<K,V,U> nextRight,
5335		BiFun<? super K, ? super V, ? extends U> transformer,
5336		BiFun<? super U, ? super U, ? extends U> reducer) {
5337	<	super(m, p, b); this.nextRight = nextRight;
5337	>	super(p, b, i, f, t); this.nextRight = nextRight;
5338		this.transformer = transformer;
5339		this.reducer = reducer;
5340		}
5341		public final U getRawResult() { return result; }
5342	<	@SuppressWarnings("unchecked") public final void compute() {
5343	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5344	<	this.transformer;
5345	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5346	<	this.reducer;
5347	<	if (transformer == null || reducer == null)
5348	<	throw new NullPointerException();
5349	<	for (int b; (b = preSplit()) > 0;)
5350	<	(rights = new MapReduceMappingsTask<K,V,U>
5351	<	(map, this, b, rights, transformer, reducer)).fork();
5352	<	U r = null, u;
5353	<	Object v;
5354	<	while ((v = advance()) != null) {
5355	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5356	<	r = (r == null) ? u : reducer.apply(r, u);
5357	<	}
5358	<	result = r;
5359	<	CountedCompleter<?> c;
5360	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5361	<	MapReduceMappingsTask<K,V,U>
5362	<	t = (MapReduceMappingsTask<K,V,U>)c,
5363	<	s = t.rights;
5364	<	while (s != null) {
5365	<	U tr, sr;
5366	<	if ((sr = s.result) != null)
5367	<	t.result = (((tr = t.result) == null) ? sr :
5368	<	reducer.apply(tr, sr));
5369	<	s = t.rights = s.nextRight;
5342	>	public final void compute() {
5343	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5344	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5345	>	if ((transformer = this.transformer) != null &&
5346	>	(reducer = this.reducer) != null) {
5347	>	for (int i = baseIndex, f, h; batch > 0 &&
5348	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5349	>	addToPendingCount(1);
5350	>	(rights = new MapReduceMappingsTask<K,V,U>
5351	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5352	>	rights, transformer, reducer)).fork();
5353	>	}
5354	>	U r = null;
5355	>	for (Node<K,V> p; (p = advance()) != null; ) {
5356	>	U u;
5357	>	if ((u = transformer.apply(p.key, p.val)) != null)
5358	>	r = (r == null) ? u : reducer.apply(r, u);
5359	>	}
5360	>	result = r;
5361	>	CountedCompleter<?> c;
5362	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5363	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5364	>	t = (MapReduceMappingsTask<K,V,U>)c,
5365	>	s = t.rights;
5366	>	while (s != null) {
5367	>	U tr, sr;
5368	>	if ((sr = s.result) != null)
5369	>	t.result = (((tr = t.result) == null) ? sr :
5370	>	reducer.apply(tr, sr));
5371	>	s = t.rights = s.nextRight;
5372	>	}
5373		}
5374		}
5375		}
5376		}
5377
5378	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5379	<	extends Traverser<K,V,Double> {
5378	>	@SuppressWarnings("serial")
5379	>	static final class MapReduceKeysToDoubleTask<K,V>
5380	>	extends BulkTask<K,V,Double> {
5381		final ObjectToDouble<? super K> transformer;
5382		final DoubleByDoubleToDouble reducer;
5383		final double basis;
5384		double result;
5385		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5386		MapReduceKeysToDoubleTask
5387	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5387	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5388		MapReduceKeysToDoubleTask<K,V> nextRight,
5389		ObjectToDouble<? super K> transformer,
5390		double basis,
5391		DoubleByDoubleToDouble reducer) {
5392	<	super(m, p, b); this.nextRight = nextRight;
5392	>	super(p, b, i, f, t); this.nextRight = nextRight;
5393		this.transformer = transformer;
5394		this.basis = basis; this.reducer = reducer;
5395		}
5396		public final Double getRawResult() { return result; }
5397	<	@SuppressWarnings("unchecked") public final void compute() {
5398	<	final ObjectToDouble<? super K> transformer =
5399	<	this.transformer;
5400	<	final DoubleByDoubleToDouble reducer = this.reducer;
5401	<	if (transformer == null || reducer == null)
5402	<	throw new NullPointerException();
5403	<	double r = this.basis;
5404	<	for (int b; (b = preSplit()) > 0;)
5405	<	(rights = new MapReduceKeysToDoubleTask<K,V>
5406	<	(map, this, b, rights, transformer, r, reducer)).fork();
5407	<	while (advance() != null)
5408	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5409	<	result = r;
5410	<	CountedCompleter<?> c;
5411	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5412	<	MapReduceKeysToDoubleTask<K,V>
5413	<	t = (MapReduceKeysToDoubleTask<K,V>)c,
5414	<	s = t.rights;
5415	<	while (s != null) {
5416	<	t.result = reducer.apply(t.result, s.result);
5417	<	s = t.rights = s.nextRight;
5397	>	public final void compute() {
5398	>	final ObjectToDouble<? super K> transformer;
5399	>	final DoubleByDoubleToDouble reducer;
5400	>	if ((transformer = this.transformer) != null &&
5401	>	(reducer = this.reducer) != null) {
5402	>	double r = this.basis;
5403	>	for (int i = baseIndex, f, h; batch > 0 &&
5404	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5405	>	addToPendingCount(1);
5406	>	(rights = new MapReduceKeysToDoubleTask<K,V>
5407	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5408	>	rights, transformer, r, reducer)).fork();
5409	>	}
5410	>	for (Node<K,V> p; (p = advance()) != null; )
5411	>	r = reducer.apply(r, transformer.apply(p.key));
5412	>	result = r;
5413	>	CountedCompleter<?> c;
5414	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5415	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5416	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5417	>	s = t.rights;
5418	>	while (s != null) {
5419	>	t.result = reducer.apply(t.result, s.result);
5420	>	s = t.rights = s.nextRight;
5421	>	}
5422		}
5423		}
5424		}
5425		}
5426
5427	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5428	<	extends Traverser<K,V,Double> {
5427	>	@SuppressWarnings("serial")
5428	>	static final class MapReduceValuesToDoubleTask<K,V>
5429	>	extends BulkTask<K,V,Double> {
5430		final ObjectToDouble<? super V> transformer;
5431		final DoubleByDoubleToDouble reducer;
5432		final double basis;
5433		double result;
5434		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5435		MapReduceValuesToDoubleTask
5436	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5436	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5437		MapReduceValuesToDoubleTask<K,V> nextRight,
5438		ObjectToDouble<? super V> transformer,
5439		double basis,
5440		DoubleByDoubleToDouble reducer) {
5441	<	super(m, p, b); this.nextRight = nextRight;
5441	>	super(p, b, i, f, t); this.nextRight = nextRight;
5442		this.transformer = transformer;
5443		this.basis = basis; this.reducer = reducer;
5444		}
5445		public final Double getRawResult() { return result; }
5446	<	@SuppressWarnings("unchecked") public final void compute() {
5447	<	final ObjectToDouble<? super V> transformer =
5448	<	this.transformer;
5449	<	final DoubleByDoubleToDouble reducer = this.reducer;
5450	<	if (transformer == null || reducer == null)
5451	<	throw new NullPointerException();
5452	<	double r = this.basis;
5453	<	for (int b; (b = preSplit()) > 0;)
5454	<	(rights = new MapReduceValuesToDoubleTask<K,V>
5455	<	(map, this, b, rights, transformer, r, reducer)).fork();
5456	<	Object v;
5457	<	while ((v = advance()) != null)
5458	<	r = reducer.apply(r, transformer.apply((V)v));
5459	<	result = r;
5460	<	CountedCompleter<?> c;
5461	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5462	<	MapReduceValuesToDoubleTask<K,V>
5463	<	t = (MapReduceValuesToDoubleTask<K,V>)c,
5464	<	s = t.rights;
5465	<	while (s != null) {
5466	<	t.result = reducer.apply(t.result, s.result);
5467	<	s = t.rights = s.nextRight;
5446	>	public final void compute() {
5447	>	final ObjectToDouble<? super V> transformer;
5448	>	final DoubleByDoubleToDouble reducer;
5449	>	if ((transformer = this.transformer) != null &&
5450	>	(reducer = this.reducer) != null) {
5451	>	double r = this.basis;
5452	>	for (int i = baseIndex, f, h; batch > 0 &&
5453	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5454	>	addToPendingCount(1);
5455	>	(rights = new MapReduceValuesToDoubleTask<K,V>
5456	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5457	>	rights, transformer, r, reducer)).fork();
5458	>	}
5459	>	for (Node<K,V> p; (p = advance()) != null; )
5460	>	r = reducer.apply(r, transformer.apply(p.val));
5461	>	result = r;
5462	>	CountedCompleter<?> c;
5463	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5464	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5465	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5466	>	s = t.rights;
5467	>	while (s != null) {
5468	>	t.result = reducer.apply(t.result, s.result);
5469	>	s = t.rights = s.nextRight;
5470	>	}
5471		}
5472		}
5473		}
5474		}
5475
5476	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5477	<	extends Traverser<K,V,Double> {
5476	>	@SuppressWarnings("serial")
5477	>	static final class MapReduceEntriesToDoubleTask<K,V>
5478	>	extends BulkTask<K,V,Double> {
5479		final ObjectToDouble<Map.Entry<K,V>> transformer;
5480		final DoubleByDoubleToDouble reducer;
5481		final double basis;
5482		double result;
5483		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5484		MapReduceEntriesToDoubleTask
5485	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5485	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5486		MapReduceEntriesToDoubleTask<K,V> nextRight,
5487		ObjectToDouble<Map.Entry<K,V>> transformer,
5488		double basis,
5489		DoubleByDoubleToDouble reducer) {
5490	<	super(m, p, b); this.nextRight = nextRight;
5490	>	super(p, b, i, f, t); this.nextRight = nextRight;
5491		this.transformer = transformer;
5492		this.basis = basis; this.reducer = reducer;
5493		}
5494		public final Double getRawResult() { return result; }
5495	<	@SuppressWarnings("unchecked") public final void compute() {
5496	<	final ObjectToDouble<Map.Entry<K,V>> transformer =
5497	<	this.transformer;
5498	<	final DoubleByDoubleToDouble reducer = this.reducer;
5499	<	if (transformer == null || reducer == null)
5500	<	throw new NullPointerException();
5501	<	double r = this.basis;
5502	<	for (int b; (b = preSplit()) > 0;)
5503	<	(rights = new MapReduceEntriesToDoubleTask<K,V>
5504	<	(map, this, b, rights, transformer, r, reducer)).fork();
5505	<	Object v;
5506	<	while ((v = advance()) != null)
5507	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5508	<	result = r;
5509	<	CountedCompleter<?> c;
5510	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5511	<	MapReduceEntriesToDoubleTask<K,V>
5512	<	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5513	<	s = t.rights;
5514	<	while (s != null) {
5515	<	t.result = reducer.apply(t.result, s.result);
5516	<	s = t.rights = s.nextRight;
5495	>	public final void compute() {
5496	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
5497	>	final DoubleByDoubleToDouble reducer;
5498	>	if ((transformer = this.transformer) != null &&
5499	>	(reducer = this.reducer) != null) {
5500	>	double r = this.basis;
5501	>	for (int i = baseIndex, f, h; batch > 0 &&
5502	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5503	>	addToPendingCount(1);
5504	>	(rights = new MapReduceEntriesToDoubleTask<K,V>
5505	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5506	>	rights, transformer, r, reducer)).fork();
5507	>	}
5508	>	for (Node<K,V> p; (p = advance()) != null; )
5509	>	r = reducer.apply(r, transformer.apply(p));
5510	>	result = r;
5511	>	CountedCompleter<?> c;
5512	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5513	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5514	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5515	>	s = t.rights;
5516	>	while (s != null) {
5517	>	t.result = reducer.apply(t.result, s.result);
5518	>	s = t.rights = s.nextRight;
5519	>	}
5520		}
5521		}
5522		}
5523		}
5524
5525	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5526	<	extends Traverser<K,V,Double> {
5525	>	@SuppressWarnings("serial")
5526	>	static final class MapReduceMappingsToDoubleTask<K,V>
5527	>	extends BulkTask<K,V,Double> {
5528		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5529		final DoubleByDoubleToDouble reducer;
5530		final double basis;
5531		double result;
5532		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5533		MapReduceMappingsToDoubleTask
5534	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5534	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5535		MapReduceMappingsToDoubleTask<K,V> nextRight,
5536		ObjectByObjectToDouble<? super K, ? super V> transformer,
5537		double basis,
5538		DoubleByDoubleToDouble reducer) {
5539	<	super(m, p, b); this.nextRight = nextRight;
5539	>	super(p, b, i, f, t); this.nextRight = nextRight;
5540		this.transformer = transformer;
5541		this.basis = basis; this.reducer = reducer;
5542		}
5543		public final Double getRawResult() { return result; }
5544	<	@SuppressWarnings("unchecked") public final void compute() {
5545	<	final ObjectByObjectToDouble<? super K, ? super V> transformer =
5546	<	this.transformer;
5547	<	final DoubleByDoubleToDouble reducer = this.reducer;
5548	<	if (transformer == null || reducer == null)
5549	<	throw new NullPointerException();
5550	<	double r = this.basis;
5551	<	for (int b; (b = preSplit()) > 0;)
5552	<	(rights = new MapReduceMappingsToDoubleTask<K,V>
5553	<	(map, this, b, rights, transformer, r, reducer)).fork();
5554	<	Object v;
5555	<	while ((v = advance()) != null)
5556	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5557	<	result = r;
5558	<	CountedCompleter<?> c;
5559	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5560	<	MapReduceMappingsToDoubleTask<K,V>
5561	<	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5562	<	s = t.rights;
5563	<	while (s != null) {
5564	<	t.result = reducer.apply(t.result, s.result);
5565	<	s = t.rights = s.nextRight;
5544	>	public final void compute() {
5545	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5546	>	final DoubleByDoubleToDouble reducer;
5547	>	if ((transformer = this.transformer) != null &&
5548	>	(reducer = this.reducer) != null) {
5549	>	double r = this.basis;
5550	>	for (int i = baseIndex, f, h; batch > 0 &&
5551	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5552	>	addToPendingCount(1);
5553	>	(rights = new MapReduceMappingsToDoubleTask<K,V>
5554	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5555	>	rights, transformer, r, reducer)).fork();
5556	>	}
5557	>	for (Node<K,V> p; (p = advance()) != null; )
5558	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5559	>	result = r;
5560	>	CountedCompleter<?> c;
5561	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5562	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5563	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5564	>	s = t.rights;
5565	>	while (s != null) {
5566	>	t.result = reducer.apply(t.result, s.result);
5567	>	s = t.rights = s.nextRight;
5568	>	}
5569		}
5570		}
5571		}
5572		}
5573
5574	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5575	<	extends Traverser<K,V,Long> {
5574	>	@SuppressWarnings("serial")
5575	>	static final class MapReduceKeysToLongTask<K,V>
5576	>	extends BulkTask<K,V,Long> {
5577		final ObjectToLong<? super K> transformer;
5578		final LongByLongToLong reducer;
5579		final long basis;
5580		long result;
5581		MapReduceKeysToLongTask<K,V> rights, nextRight;
5582		MapReduceKeysToLongTask
5583	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5583	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5584		MapReduceKeysToLongTask<K,V> nextRight,
5585		ObjectToLong<? super K> transformer,
5586		long basis,
5587		LongByLongToLong reducer) {
5588	<	super(m, p, b); this.nextRight = nextRight;
5588	>	super(p, b, i, f, t); this.nextRight = nextRight;
5589		this.transformer = transformer;
5590		this.basis = basis; this.reducer = reducer;
5591		}
5592		public final Long getRawResult() { return result; }
5593	<	@SuppressWarnings("unchecked") public final void compute() {
5594	<	final ObjectToLong<? super K> transformer =
5595	<	this.transformer;
5596	<	final LongByLongToLong reducer = this.reducer;
5597	<	if (transformer == null || reducer == null)
5598	<	throw new NullPointerException();
5599	<	long r = this.basis;
5600	<	for (int b; (b = preSplit()) > 0;)
5601	<	(rights = new MapReduceKeysToLongTask<K,V>
5602	<	(map, this, b, rights, transformer, r, reducer)).fork();
5603	<	while (advance() != null)
5604	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5605	<	result = r;
5606	<	CountedCompleter<?> c;
5607	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5608	<	MapReduceKeysToLongTask<K,V>
5609	<	t = (MapReduceKeysToLongTask<K,V>)c,
5610	<	s = t.rights;
5611	<	while (s != null) {
5612	<	t.result = reducer.apply(t.result, s.result);
5613	<	s = t.rights = s.nextRight;
5593	>	public final void compute() {
5594	>	final ObjectToLong<? super K> transformer;
5595	>	final LongByLongToLong reducer;
5596	>	if ((transformer = this.transformer) != null &&
5597	>	(reducer = this.reducer) != null) {
5598	>	long r = this.basis;
5599	>	for (int i = baseIndex, f, h; batch > 0 &&
5600	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5601	>	addToPendingCount(1);
5602	>	(rights = new MapReduceKeysToLongTask<K,V>
5603	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5604	>	rights, transformer, r, reducer)).fork();
5605	>	}
5606	>	for (Node<K,V> p; (p = advance()) != null; )
5607	>	r = reducer.apply(r, transformer.apply(p.key));
5608	>	result = r;
5609	>	CountedCompleter<?> c;
5610	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5611	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5612	>	t = (MapReduceKeysToLongTask<K,V>)c,
5613	>	s = t.rights;
5614	>	while (s != null) {
5615	>	t.result = reducer.apply(t.result, s.result);
5616	>	s = t.rights = s.nextRight;
5617	>	}
5618		}
5619		}
5620		}
5621		}
5622
5623	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5624	<	extends Traverser<K,V,Long> {
5623	>	@SuppressWarnings("serial")
5624	>	static final class MapReduceValuesToLongTask<K,V>
5625	>	extends BulkTask<K,V,Long> {
5626		final ObjectToLong<? super V> transformer;
5627		final LongByLongToLong reducer;
5628		final long basis;
5629		long result;
5630		MapReduceValuesToLongTask<K,V> rights, nextRight;
5631		MapReduceValuesToLongTask
5632	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5632	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5633		MapReduceValuesToLongTask<K,V> nextRight,
5634		ObjectToLong<? super V> transformer,
5635		long basis,
5636		LongByLongToLong reducer) {
5637	<	super(m, p, b); this.nextRight = nextRight;
5637	>	super(p, b, i, f, t); this.nextRight = nextRight;
5638		this.transformer = transformer;
5639		this.basis = basis; this.reducer = reducer;
5640		}
5641		public final Long getRawResult() { return result; }
5642	<	@SuppressWarnings("unchecked") public final void compute() {
5643	<	final ObjectToLong<? super V> transformer =
5644	<	this.transformer;
5645	<	final LongByLongToLong reducer = this.reducer;
5646	<	if (transformer == null || reducer == null)
5647	<	throw new NullPointerException();
5648	<	long r = this.basis;
5649	<	for (int b; (b = preSplit()) > 0;)
5650	<	(rights = new MapReduceValuesToLongTask<K,V>
5651	<	(map, this, b, rights, transformer, r, reducer)).fork();
5652	<	Object v;
5653	<	while ((v = advance()) != null)
5654	<	r = reducer.apply(r, transformer.apply((V)v));
5655	<	result = r;
5656	<	CountedCompleter<?> c;
5657	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5658	<	MapReduceValuesToLongTask<K,V>
5659	<	t = (MapReduceValuesToLongTask<K,V>)c,
5660	<	s = t.rights;
5661	<	while (s != null) {
5662	<	t.result = reducer.apply(t.result, s.result);
5663	<	s = t.rights = s.nextRight;
5642	>	public final void compute() {
5643	>	final ObjectToLong<? super V> transformer;
5644	>	final LongByLongToLong reducer;
5645	>	if ((transformer = this.transformer) != null &&
5646	>	(reducer = this.reducer) != null) {
5647	>	long r = this.basis;
5648	>	for (int i = baseIndex, f, h; batch > 0 &&
5649	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5650	>	addToPendingCount(1);
5651	>	(rights = new MapReduceValuesToLongTask<K,V>
5652	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5653	>	rights, transformer, r, reducer)).fork();
5654	>	}
5655	>	for (Node<K,V> p; (p = advance()) != null; )
5656	>	r = reducer.apply(r, transformer.apply(p.val));
5657	>	result = r;
5658	>	CountedCompleter<?> c;
5659	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5660	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5661	>	t = (MapReduceValuesToLongTask<K,V>)c,
5662	>	s = t.rights;
5663	>	while (s != null) {
5664	>	t.result = reducer.apply(t.result, s.result);
5665	>	s = t.rights = s.nextRight;
5666	>	}
5667		}
5668		}
5669		}
5670		}
5671
5672	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5673	<	extends Traverser<K,V,Long> {
5672	>	@SuppressWarnings("serial")
5673	>	static final class MapReduceEntriesToLongTask<K,V>
5674	>	extends BulkTask<K,V,Long> {
5675		final ObjectToLong<Map.Entry<K,V>> transformer;
5676		final LongByLongToLong reducer;
5677		final long basis;
5678		long result;
5679		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5680		MapReduceEntriesToLongTask
5681	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5681	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5682		MapReduceEntriesToLongTask<K,V> nextRight,
5683		ObjectToLong<Map.Entry<K,V>> transformer,
5684		long basis,
5685		LongByLongToLong reducer) {
5686	<	super(m, p, b); this.nextRight = nextRight;
5686	>	super(p, b, i, f, t); this.nextRight = nextRight;
5687		this.transformer = transformer;
5688		this.basis = basis; this.reducer = reducer;
5689		}
5690		public final Long getRawResult() { return result; }
5691	<	@SuppressWarnings("unchecked") public final void compute() {
5692	<	final ObjectToLong<Map.Entry<K,V>> transformer =
5693	<	this.transformer;
5694	<	final LongByLongToLong reducer = this.reducer;
5695	<	if (transformer == null || reducer == null)
5696	<	throw new NullPointerException();
5697	<	long r = this.basis;
5698	<	for (int b; (b = preSplit()) > 0;)
5699	<	(rights = new MapReduceEntriesToLongTask<K,V>
5700	<	(map, this, b, rights, transformer, r, reducer)).fork();
5701	<	Object v;
5702	<	while ((v = advance()) != null)
5703	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5704	<	result = r;
5705	<	CountedCompleter<?> c;
5706	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5707	<	MapReduceEntriesToLongTask<K,V>
5708	<	t = (MapReduceEntriesToLongTask<K,V>)c,
5709	<	s = t.rights;
5710	<	while (s != null) {
5711	<	t.result = reducer.apply(t.result, s.result);
5712	<	s = t.rights = s.nextRight;
5691	>	public final void compute() {
5692	>	final ObjectToLong<Map.Entry<K,V>> transformer;
5693	>	final LongByLongToLong reducer;
5694	>	if ((transformer = this.transformer) != null &&
5695	>	(reducer = this.reducer) != null) {
5696	>	long r = this.basis;
5697	>	for (int i = baseIndex, f, h; batch > 0 &&
5698	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5699	>	addToPendingCount(1);
5700	>	(rights = new MapReduceEntriesToLongTask<K,V>
5701	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5702	>	rights, transformer, r, reducer)).fork();
5703	>	}
5704	>	for (Node<K,V> p; (p = advance()) != null; )
5705	>	r = reducer.apply(r, transformer.apply(p));
5706	>	result = r;
5707	>	CountedCompleter<?> c;
5708	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5709	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5710	>	t = (MapReduceEntriesToLongTask<K,V>)c,
5711	>	s = t.rights;
5712	>	while (s != null) {
5713	>	t.result = reducer.apply(t.result, s.result);
5714	>	s = t.rights = s.nextRight;
5715	>	}
5716		}
5717		}
5718		}
5719		}
5720
5721	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5722	<	extends Traverser<K,V,Long> {
5721	>	@SuppressWarnings("serial")
5722	>	static final class MapReduceMappingsToLongTask<K,V>
5723	>	extends BulkTask<K,V,Long> {
5724		final ObjectByObjectToLong<? super K, ? super V> transformer;
5725		final LongByLongToLong reducer;
5726		final long basis;
5727		long result;
5728		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5729		MapReduceMappingsToLongTask
5730	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5730	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5731		MapReduceMappingsToLongTask<K,V> nextRight,
5732		ObjectByObjectToLong<? super K, ? super V> transformer,
5733		long basis,
5734		LongByLongToLong reducer) {
5735	<	super(m, p, b); this.nextRight = nextRight;
5735	>	super(p, b, i, f, t); this.nextRight = nextRight;
5736		this.transformer = transformer;
5737		this.basis = basis; this.reducer = reducer;
5738		}
5739		public final Long getRawResult() { return result; }
5740	<	@SuppressWarnings("unchecked") public final void compute() {
5741	<	final ObjectByObjectToLong<? super K, ? super V> transformer =
5742	<	this.transformer;
5743	<	final LongByLongToLong reducer = this.reducer;
5744	<	if (transformer == null || reducer == null)
5745	<	throw new NullPointerException();
5746	<	long r = this.basis;
5747	<	for (int b; (b = preSplit()) > 0;)
5748	<	(rights = new MapReduceMappingsToLongTask<K,V>
5749	<	(map, this, b, rights, transformer, r, reducer)).fork();
5750	<	Object v;
5751	<	while ((v = advance()) != null)
5752	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5753	<	result = r;
5754	<	CountedCompleter<?> c;
5755	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5756	<	MapReduceMappingsToLongTask<K,V>
5757	<	t = (MapReduceMappingsToLongTask<K,V>)c,
5758	<	s = t.rights;
5759	<	while (s != null) {
5760	<	t.result = reducer.apply(t.result, s.result);
5761	<	s = t.rights = s.nextRight;
5740	>	public final void compute() {
5741	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
5742	>	final LongByLongToLong reducer;
5743	>	if ((transformer = this.transformer) != null &&
5744	>	(reducer = this.reducer) != null) {
5745	>	long r = this.basis;
5746	>	for (int i = baseIndex, f, h; batch > 0 &&
5747	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5748	>	addToPendingCount(1);
5749	>	(rights = new MapReduceMappingsToLongTask<K,V>
5750	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5751	>	rights, transformer, r, reducer)).fork();
5752	>	}
5753	>	for (Node<K,V> p; (p = advance()) != null; )
5754	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5755	>	result = r;
5756	>	CountedCompleter<?> c;
5757	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5758	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5759	>	t = (MapReduceMappingsToLongTask<K,V>)c,
5760	>	s = t.rights;
5761	>	while (s != null) {
5762	>	t.result = reducer.apply(t.result, s.result);
5763	>	s = t.rights = s.nextRight;
5764	>	}
5765		}
5766		}
5767		}
5768		}
5769
5770	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5771	<	extends Traverser<K,V,Integer> {
5770	>	@SuppressWarnings("serial")
5771	>	static final class MapReduceKeysToIntTask<K,V>
5772	>	extends BulkTask<K,V,Integer> {
5773		final ObjectToInt<? super K> transformer;
5774		final IntByIntToInt reducer;
5775		final int basis;
5776		int result;
5777		MapReduceKeysToIntTask<K,V> rights, nextRight;
5778		MapReduceKeysToIntTask
5779	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5779	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5780		MapReduceKeysToIntTask<K,V> nextRight,
5781		ObjectToInt<? super K> transformer,
5782		int basis,
5783		IntByIntToInt reducer) {
5784	<	super(m, p, b); this.nextRight = nextRight;
5784	>	super(p, b, i, f, t); this.nextRight = nextRight;
5785		this.transformer = transformer;
5786		this.basis = basis; this.reducer = reducer;
5787		}
5788		public final Integer getRawResult() { return result; }
5789	<	@SuppressWarnings("unchecked") public final void compute() {
5790	<	final ObjectToInt<? super K> transformer =
5791	<	this.transformer;
5792	<	final IntByIntToInt reducer = this.reducer;
5793	<	if (transformer == null || reducer == null)
5794	<	throw new NullPointerException();
5795	<	int r = this.basis;
5796	<	for (int b; (b = preSplit()) > 0;)
5797	<	(rights = new MapReduceKeysToIntTask<K,V>
5798	<	(map, this, b, rights, transformer, r, reducer)).fork();
5799	<	while (advance() != null)
5800	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5801	<	result = r;
5802	<	CountedCompleter<?> c;
5803	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5804	<	MapReduceKeysToIntTask<K,V>
5805	<	t = (MapReduceKeysToIntTask<K,V>)c,
5806	<	s = t.rights;
5807	<	while (s != null) {
5808	<	t.result = reducer.apply(t.result, s.result);
5809	<	s = t.rights = s.nextRight;
5789	>	public final void compute() {
5790	>	final ObjectToInt<? super K> transformer;
5791	>	final IntByIntToInt reducer;
5792	>	if ((transformer = this.transformer) != null &&
5793	>	(reducer = this.reducer) != null) {
5794	>	int r = this.basis;
5795	>	for (int i = baseIndex, f, h; batch > 0 &&
5796	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5797	>	addToPendingCount(1);
5798	>	(rights = new MapReduceKeysToIntTask<K,V>
5799	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5800	>	rights, transformer, r, reducer)).fork();
5801	>	}
5802	>	for (Node<K,V> p; (p = advance()) != null; )
5803	>	r = reducer.apply(r, transformer.apply(p.key));
5804	>	result = r;
5805	>	CountedCompleter<?> c;
5806	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5807	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5808	>	t = (MapReduceKeysToIntTask<K,V>)c,
5809	>	s = t.rights;
5810	>	while (s != null) {
5811	>	t.result = reducer.apply(t.result, s.result);
5812	>	s = t.rights = s.nextRight;
5813	>	}
5814		}
5815		}
5816		}
5817		}
5818
5819	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5820	<	extends Traverser<K,V,Integer> {
5819	>	@SuppressWarnings("serial")
5820	>	static final class MapReduceValuesToIntTask<K,V>
5821	>	extends BulkTask<K,V,Integer> {
5822		final ObjectToInt<? super V> transformer;
5823		final IntByIntToInt reducer;
5824		final int basis;
5825		int result;
5826		MapReduceValuesToIntTask<K,V> rights, nextRight;
5827		MapReduceValuesToIntTask
5828	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5828	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5829		MapReduceValuesToIntTask<K,V> nextRight,
5830		ObjectToInt<? super V> transformer,
5831		int basis,
5832		IntByIntToInt reducer) {
5833	<	super(m, p, b); this.nextRight = nextRight;
5833	>	super(p, b, i, f, t); this.nextRight = nextRight;
5834		this.transformer = transformer;
5835		this.basis = basis; this.reducer = reducer;
5836		}
5837		public final Integer getRawResult() { return result; }
5838	<	@SuppressWarnings("unchecked") public final void compute() {
5839	<	final ObjectToInt<? super V> transformer =
5840	<	this.transformer;
5841	<	final IntByIntToInt reducer = this.reducer;
5842	<	if (transformer == null || reducer == null)
5843	<	throw new NullPointerException();
5844	<	int r = this.basis;
5845	<	for (int b; (b = preSplit()) > 0;)
5846	<	(rights = new MapReduceValuesToIntTask<K,V>
5847	<	(map, this, b, rights, transformer, r, reducer)).fork();
5848	<	Object v;
5849	<	while ((v = advance()) != null)
5850	<	r = reducer.apply(r, transformer.apply((V)v));
5851	<	result = r;
5852	<	CountedCompleter<?> c;
5853	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5854	<	MapReduceValuesToIntTask<K,V>
5855	<	t = (MapReduceValuesToIntTask<K,V>)c,
5856	<	s = t.rights;
5857	<	while (s != null) {
5858	<	t.result = reducer.apply(t.result, s.result);
5859	<	s = t.rights = s.nextRight;
5838	>	public final void compute() {
5839	>	final ObjectToInt<? super V> transformer;
5840	>	final IntByIntToInt reducer;
5841	>	if ((transformer = this.transformer) != null &&
5842	>	(reducer = this.reducer) != null) {
5843	>	int r = this.basis;
5844	>	for (int i = baseIndex, f, h; batch > 0 &&
5845	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5846	>	addToPendingCount(1);
5847	>	(rights = new MapReduceValuesToIntTask<K,V>
5848	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5849	>	rights, transformer, r, reducer)).fork();
5850	>	}
5851	>	for (Node<K,V> p; (p = advance()) != null; )
5852	>	r = reducer.apply(r, transformer.apply(p.val));
5853	>	result = r;
5854	>	CountedCompleter<?> c;
5855	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5856	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5857	>	t = (MapReduceValuesToIntTask<K,V>)c,
5858	>	s = t.rights;
5859	>	while (s != null) {
5860	>	t.result = reducer.apply(t.result, s.result);
5861	>	s = t.rights = s.nextRight;
5862	>	}
5863		}
5864		}
5865		}
5866		}
5867
5868	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
5869	<	extends Traverser<K,V,Integer> {
5868	>	@SuppressWarnings("serial")
5869	>	static final class MapReduceEntriesToIntTask<K,V>
5870	>	extends BulkTask<K,V,Integer> {
5871		final ObjectToInt<Map.Entry<K,V>> transformer;
5872		final IntByIntToInt reducer;
5873		final int basis;
5874		int result;
5875		MapReduceEntriesToIntTask<K,V> rights, nextRight;
5876		MapReduceEntriesToIntTask
5877	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5877	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5878		MapReduceEntriesToIntTask<K,V> nextRight,
5879		ObjectToInt<Map.Entry<K,V>> transformer,
5880		int basis,
5881		IntByIntToInt reducer) {
5882	<	super(m, p, b); this.nextRight = nextRight;
5882	>	super(p, b, i, f, t); this.nextRight = nextRight;
5883		this.transformer = transformer;
5884		this.basis = basis; this.reducer = reducer;
5885		}
5886		public final Integer getRawResult() { return result; }
5887	<	@SuppressWarnings("unchecked") public final void compute() {
5888	<	final ObjectToInt<Map.Entry<K,V>> transformer =
5889	<	this.transformer;
5890	<	final IntByIntToInt reducer = this.reducer;
5891	<	if (transformer == null || reducer == null)
5892	<	throw new NullPointerException();
5893	<	int r = this.basis;
5894	<	for (int b; (b = preSplit()) > 0;)
5895	<	(rights = new MapReduceEntriesToIntTask<K,V>
5896	<	(map, this, b, rights, transformer, r, reducer)).fork();
5897	<	Object v;
5898	<	while ((v = advance()) != null)
5899	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5900	<	result = r;
5901	<	CountedCompleter<?> c;
5902	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5903	<	MapReduceEntriesToIntTask<K,V>
5904	<	t = (MapReduceEntriesToIntTask<K,V>)c,
5905	<	s = t.rights;
5906	<	while (s != null) {
5907	<	t.result = reducer.apply(t.result, s.result);
5908	<	s = t.rights = s.nextRight;
5887	>	public final void compute() {
5888	>	final ObjectToInt<Map.Entry<K,V>> transformer;
5889	>	final IntByIntToInt reducer;
5890	>	if ((transformer = this.transformer) != null &&
5891	>	(reducer = this.reducer) != null) {
5892	>	int r = this.basis;
5893	>	for (int i = baseIndex, f, h; batch > 0 &&
5894	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5895	>	addToPendingCount(1);
5896	>	(rights = new MapReduceEntriesToIntTask<K,V>
5897	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5898	>	rights, transformer, r, reducer)).fork();
5899	>	}
5900	>	for (Node<K,V> p; (p = advance()) != null; )
5901	>	r = reducer.apply(r, transformer.apply(p));
5902	>	result = r;
5903	>	CountedCompleter<?> c;
5904	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5905	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
5906	>	t = (MapReduceEntriesToIntTask<K,V>)c,
5907	>	s = t.rights;
5908	>	while (s != null) {
5909	>	t.result = reducer.apply(t.result, s.result);
5910	>	s = t.rights = s.nextRight;
5911	>	}
5912		}
5913		}
5914		}
5915		}
5916
5917	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
5918	<	extends Traverser<K,V,Integer> {
5917	>	@SuppressWarnings("serial")
5918	>	static final class MapReduceMappingsToIntTask<K,V>
5919	>	extends BulkTask<K,V,Integer> {
5920		final ObjectByObjectToInt<? super K, ? super V> transformer;
5921		final IntByIntToInt reducer;
5922		final int basis;
5923		int result;
5924		MapReduceMappingsToIntTask<K,V> rights, nextRight;
5925		MapReduceMappingsToIntTask
5926	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5926	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5927		MapReduceMappingsToIntTask<K,V> nextRight,
5928		ObjectByObjectToInt<? super K, ? super V> transformer,
5929		int basis,
5930		IntByIntToInt reducer) {
5931	<	super(m, p, b); this.nextRight = nextRight;
5931	>	super(p, b, i, f, t); this.nextRight = nextRight;
5932		this.transformer = transformer;
5933		this.basis = basis; this.reducer = reducer;
5934		}
5935		public final Integer getRawResult() { return result; }
5936	<	@SuppressWarnings("unchecked") public final void compute() {
5937	<	final ObjectByObjectToInt<? super K, ? super V> transformer =
5938	<	this.transformer;
5939	<	final IntByIntToInt reducer = this.reducer;
5940	<	if (transformer == null || reducer == null)
5941	<	throw new NullPointerException();
5942	<	int r = this.basis;
5943	<	for (int b; (b = preSplit()) > 0;)
5944	<	(rights = new MapReduceMappingsToIntTask<K,V>
5945	<	(map, this, b, rights, transformer, r, reducer)).fork();
5946	<	Object v;
5947	<	while ((v = advance()) != null)
5948	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5949	<	result = r;
5950	<	CountedCompleter<?> c;
5951	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5952	<	MapReduceMappingsToIntTask<K,V>
5953	<	t = (MapReduceMappingsToIntTask<K,V>)c,
5954	<	s = t.rights;
5955	<	while (s != null) {
5956	<	t.result = reducer.apply(t.result, s.result);
5957	<	s = t.rights = s.nextRight;
5936	>	public final void compute() {
5937	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
5938	>	final IntByIntToInt reducer;
5939	>	if ((transformer = this.transformer) != null &&
5940	>	(reducer = this.reducer) != null) {
5941	>	int r = this.basis;
5942	>	for (int i = baseIndex, f, h; batch > 0 &&
5943	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5944	>	addToPendingCount(1);
5945	>	(rights = new MapReduceMappingsToIntTask<K,V>
5946	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5947	>	rights, transformer, r, reducer)).fork();
5948	>	}
5949	>	for (Node<K,V> p; (p = advance()) != null; )
5950	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5951	>	result = r;
5952	>	CountedCompleter<?> c;
5953	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5954	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
5955	>	t = (MapReduceMappingsToIntTask<K,V>)c,
5956	>	s = t.rights;
5957	>	while (s != null) {
5958	>	t.result = reducer.apply(t.result, s.result);
5959	>	s = t.rights = s.nextRight;
5960	>	}
5961		}
5962		}
5963		}
5964		}
5965
5966	+	/* ---------------- Counters -------------- */
5967	+
5968	+	// Adapted from LongAdder and Striped64.
5969	+	// See their internal docs for explanation.
5970	+
5971	+	// A padded cell for distributing counts
5972	+	static final class CounterCell {
5973	+	volatile long p0, p1, p2, p3, p4, p5, p6;
5974	+	volatile long value;
5975	+	volatile long q0, q1, q2, q3, q4, q5, q6;
5976	+	CounterCell(long x) { value = x; }
5977	+	}
5978	+
5979	+	/**
5980	+	* Holder for the thread-local hash code determining which
5981	+	* CounterCell to use. The code is initialized via the
5982	+	* counterHashCodeGenerator, but may be moved upon collisions.
5983	+	*/
5984	+	static final class CounterHashCode {
5985	+	int code;
5986	+	}
5987	+
5988	+	/**
5989	+	* Generates initial value for per-thread CounterHashCodes.
5990	+	*/
5991	+	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
5992	+
5993	+	/**
5994	+	* Increment for counterHashCodeGenerator. See class ThreadLocal
5995	+	* for explanation.
5996	+	*/
5997	+	static final int SEED_INCREMENT = 0x61c88647;
5998	+
5999	+	/**
6000	+	* Per-thread counter hash codes. Shared across all instances.
6001	+	*/
6002	+	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
6003	+	new ThreadLocal<CounterHashCode>();
6004	+
6005	+
6006	+	final long sumCount() {
6007	+	CounterCell[] as = counterCells; CounterCell a;
6008	+	long sum = baseCount;
6009	+	if (as != null) {
6010	+	for (int i = 0; i < as.length; ++i) {
6011	+	if ((a = as[i]) != null)
6012	+	sum += a.value;
6013	+	}
6014	+	}
6015	+	return sum;
6016	+	}
6017	+
6018	+	// See LongAdder version for explanation
6019	+	private final void fullAddCount(long x, CounterHashCode hc,
6020	+	boolean wasUncontended) {
6021	+	int h;
6022	+	if (hc == null) {
6023	+	hc = new CounterHashCode();
6024	+	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
6025	+	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
6026	+	threadCounterHashCode.set(hc);
6027	+	}
6028	+	else
6029	+	h = hc.code;
6030	+	boolean collide = false;                // True if last slot nonempty
6031	+	for (;;) {
6032	+	CounterCell[] as; CounterCell a; int n; long v;
6033	+	if ((as = counterCells) != null && (n = as.length) > 0) {
6034	+	if ((a = as[(n - 1) & h]) == null) {
6035	+	if (cellsBusy == 0) {            // Try to attach new Cell
6036	+	CounterCell r = new CounterCell(x); // Optimistic create
6037	+	if (cellsBusy == 0 &&
6038	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6039	+	boolean created = false;
6040	+	try {               // Recheck under lock
6041	+	CounterCell[] rs; int m, j;
6042	+	if ((rs = counterCells) != null &&
6043	+	(m = rs.length) > 0 &&
6044	+	rs[j = (m - 1) & h] == null) {
6045	+	rs[j] = r;
6046	+	created = true;
6047	+	}
6048	+	} finally {
6049	+	cellsBusy = 0;
6050	+	}
6051	+	if (created)
6052	+	break;
6053	+	continue;           // Slot is now non-empty
6054	+	}
6055	+	}
6056	+	collide = false;
6057	+	}
6058	+	else if (!wasUncontended)       // CAS already known to fail
6059	+	wasUncontended = true;      // Continue after rehash
6060	+	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
6061	+	break;
6062	+	else if (counterCells != as || n >= NCPU)
6063	+	collide = false;            // At max size or stale
6064	+	else if (!collide)
6065	+	collide = true;
6066	+	else if (cellsBusy == 0 &&
6067	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6068	+	try {
6069	+	if (counterCells == as) {// Expand table unless stale
6070	+	CounterCell[] rs = new CounterCell[n << 1];
6071	+	for (int i = 0; i < n; ++i)
6072	+	rs[i] = as[i];
6073	+	counterCells = rs;
6074	+	}
6075	+	} finally {
6076	+	cellsBusy = 0;
6077	+	}
6078	+	collide = false;
6079	+	continue;                   // Retry with expanded table
6080	+	}
6081	+	h ^= h << 13;                   // Rehash
6082	+	h ^= h >>> 17;
6083	+	h ^= h << 5;
6084	+	}
6085	+	else if (cellsBusy == 0 && counterCells == as &&
6086	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6087	+	boolean init = false;
6088	+	try {                           // Initialize table
6089	+	if (counterCells == as) {
6090	+	CounterCell[] rs = new CounterCell[2];
6091	+	rs[h & 1] = new CounterCell(x);
6092	+	counterCells = rs;
6093	+	init = true;
6094	+	}
6095	+	} finally {
6096	+	cellsBusy = 0;
6097	+	}
6098	+	if (init)
6099	+	break;
6100	+	}
6101	+	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
6102	+	break;                          // Fall back on using base
6103	+	}
6104	+	hc.code = h;                            // Record index for next time
6105	+	}
6106	+
6107		// Unsafe mechanics
6108	<	private static final sun.misc.Unsafe UNSAFE;
6109	<	private static final long counterOffset;
6110	<	private static final long sizeCtlOffset;
6108	>	private static final sun.misc.Unsafe U;
6109	>	private static final long SIZECTL;
6110	>	private static final long TRANSFERINDEX;
6111	>	private static final long TRANSFERORIGIN;
6112	>	private static final long BASECOUNT;
6113	>	private static final long CELLSBUSY;
6114	>	private static final long CELLVALUE;
6115		private static final long ABASE;
6116		private static final int ASHIFT;
6117
6118		static {
6621	–	int ss;
6119		try {
6120	<	UNSAFE = getUnsafe();
6120	>	U = getUnsafe();
6121		Class<?> k = ConcurrentHashMapV8.class;
6122	<	counterOffset = UNSAFE.objectFieldOffset
6626	<	(k.getDeclaredField("counter"));
6627	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6122	>	SIZECTL = U.objectFieldOffset
6123		(k.getDeclaredField("sizeCtl"));
6124	<	Class<?> sc = Node[].class;
6125	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6126	<	ss = UNSAFE.arrayIndexScale(sc);
6124	>	TRANSFERINDEX = U.objectFieldOffset
6125	>	(k.getDeclaredField("transferIndex"));
6126	>	TRANSFERORIGIN = U.objectFieldOffset
6127	>	(k.getDeclaredField("transferOrigin"));
6128	>	BASECOUNT = U.objectFieldOffset
6129	>	(k.getDeclaredField("baseCount"));
6130	>	CELLSBUSY = U.objectFieldOffset
6131	>	(k.getDeclaredField("cellsBusy"));
6132	>	Class<?> ck = CounterCell.class;
6133	>	CELLVALUE = U.objectFieldOffset
6134	>	(ck.getDeclaredField("value"));
6135	>	Class<?> ak = Node[].class;
6136	>	ABASE = U.arrayBaseOffset(ak);
6137	>	int scale = U.arrayIndexScale(ak);
6138	>	if ((scale & (scale - 1)) != 0)
6139	>	throw new Error("data type scale not a power of two");
6140	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6141		} catch (Exception e) {
6142		throw new Error(e);
6143		}
6635	–	if ((ss & (ss-1)) != 0)
6636	–	throw new Error("data type scale not a power of two");
6637	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6144		}
6145
6146		/**
#	Line 6647 | Line 6153 | public class ConcurrentHashMapV8<K, V>
6153		private static sun.misc.Unsafe getUnsafe() {
6154		try {
6155		return sun.misc.Unsafe.getUnsafe();
6156	<	} catch (SecurityException se) {
6157	<	try {
6158	<	return java.security.AccessController.doPrivileged
6159	<	(new java.security
6160	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6161	<	public sun.misc.Unsafe run() throws Exception {
6162	<	java.lang.reflect.Field f = sun.misc
6163	<	.Unsafe.class.getDeclaredField("theUnsafe");
6164	<	f.setAccessible(true);
6165	<	return (sun.misc.Unsafe) f.get(null);
6166	<	}});
6167	<	} catch (java.security.PrivilegedActionException e) {
6168	<	throw new RuntimeException("Could not initialize intrinsics",
6169	<	e.getCause());
6170	<	}
6156	>	} catch (SecurityException tryReflectionInstead) {}
6157	>	try {
6158	>	return java.security.AccessController.doPrivileged
6159	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6160	>	public sun.misc.Unsafe run() throws Exception {
6161	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6162	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6163	>	f.setAccessible(true);
6164	>	Object x = f.get(null);
6165	>	if (k.isInstance(x))
6166	>	return k.cast(x);
6167	>	}
6168	>	throw new NoSuchFieldError("the Unsafe");
6169	>	}});
6170	>	} catch (java.security.PrivilegedActionException e) {
6171	>	throw new RuntimeException("Could not initialize intrinsics",
6172	>	e.getCause());
6173		}
6174		}
6175		}

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