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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 1.120 by dl, Sun Dec 1 20:55:50 2013 UTC

#	Line 6 | Line 6
6
7		package jsr166e;
8
9	<	import java.util.Comparator;
10	<	import java.util.Arrays;
11	<	import java.util.Map;
12	<	import java.util.Set;
13	<	import java.util.Collection;
14	<	import java.util.AbstractMap;
15	<	import java.util.AbstractSet;
16	<	import java.util.AbstractCollection;
17	<	import java.util.Hashtable;
18	<	import java.util.HashMap;
19	<	import java.util.Iterator;
20	<	import java.util.Enumeration;
21	<	import java.util.ConcurrentModificationException;
22	<	import java.util.NoSuchElementException;
23	<	import java.util.concurrent.ConcurrentMap;
24	<	import java.util.concurrent.ThreadLocalRandom;
25	<	import java.util.concurrent.locks.LockSupport;
26	<	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
27	<	import java.util.concurrent.atomic.AtomicReference;
9	>	import jsr166e.ForkJoinPool;
10
11	+	import java.io.ObjectStreamField;
12		import java.io.Serializable;
13	<
14	<	import java.util.Comparator;
13	>	import java.lang.reflect.ParameterizedType;
14	>	import java.lang.reflect.Type;
15	>	import java.util.AbstractMap;
16		import java.util.Arrays;
33	–	import java.util.Map;
34	–	import java.util.Set;
17		import java.util.Collection;
18	<	import java.util.AbstractMap;
19	<	import java.util.AbstractSet;
20	<	import java.util.AbstractCollection;
39	<	import java.util.Hashtable;
18	>	import java.util.Comparator;
19	>	import java.util.ConcurrentModificationException;
20	>	import java.util.Enumeration;
21		import java.util.HashMap;
22	+	import java.util.Hashtable;
23		import java.util.Iterator;
24	<	import java.util.Enumeration;
43	<	import java.util.ConcurrentModificationException;
24	>	import java.util.Map;
25		import java.util.NoSuchElementException;
26	+	import java.util.Set;
27		import java.util.concurrent.ConcurrentMap;
46	–	import java.util.concurrent.ThreadLocalRandom;
47	–	import java.util.concurrent.locks.LockSupport;
48	–	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
28		import java.util.concurrent.atomic.AtomicReference;
29	<
30	<	import java.io.Serializable;
29	>	import java.util.concurrent.atomic.AtomicInteger;
30	>	import java.util.concurrent.locks.LockSupport;
31	>	import java.util.concurrent.locks.ReentrantLock;
32
33		/**
34		* A hash table supporting full concurrency of retrievals and
#	Line 102 | Line 82 | import java.io.Serializable;
82		* expected {@code concurrencyLevel} as an additional hint for
83		* internal sizing.  Note that using many keys with exactly the same
84		* {@code hashCode()} is a sure way to slow down performance of any
85	<	* hash table.
85	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
86	>	* this class may use comparison order among keys to help break ties.
87		*
88		* <p>A {@link Set} projection of a ConcurrentHashMapV8 may be created
89		* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
#	Line 110 | Line 91 | import java.io.Serializable;
91		* mapped values are (perhaps transiently) not used or all take the
92		* same mapping value.
93		*
113	–	* <p>A ConcurrentHashMapV8 can be used as scalable frequency map (a
114	–	* form of histogram or multiset) by using {@link LongAdder} values
115	–	* and initializing via {@link #computeIfAbsent}. For example, to add
116	–	* a count to a {@code ConcurrentHashMapV8<String,LongAdder> freqs}, you
117	–	* can use {@code freqs.computeIfAbsent(k -> new
118	–	* LongAdder()).increment();}
119	–	*
94		* <p>This class and its views and iterators implement all of the
95		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
96		* interfaces.
#	Line 124 | Line 98 | import java.io.Serializable;
98		* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
99		* does <em>not</em> allow {@code null} to be used as a key or value.
100		*
101	<	* <p>ConcurrentHashMapV8s support parallel operations using the {@link
102	<	* ForkJoinPool#commonPool}. (Tasks that may be used in other contexts
103	<	* are available in class {@link ForkJoinTasks}). These operations are
104	<	* designed to be safely, and often sensibly, applied even with maps
105	<	* that are being concurrently updated by other threads; for example,
106	<	* when computing a snapshot summary of the values in a shared
107	<	* registry.  There are three kinds of operation, each with four
108	<	* forms, accepting functions with Keys, Values, Entries, and (Key,
109	<	* Value) arguments and/or return values. (The first three forms are
110	<	* also available via the {@link #keySet()}, {@link #values()} and
111	<	* {@link #entrySet()} views). Because the elements of a
112	<	* ConcurrentHashMapV8 are not ordered in any particular way, and may be
113	<	* processed in different orders in different parallel executions, the
114	<	* correctness of supplied functions should not depend on any
115	<	* ordering, or on any other objects or values that may transiently
142	<	* change while computation is in progress; and except for forEach
143	<	* actions, should ideally be side-effect-free.
101	>	* <p>ConcurrentHashMapV8s support a set of sequential and parallel bulk
102	>	* operations that are designed
103	>	* to be safely, and often sensibly, applied even with maps that are
104	>	* being concurrently updated by other threads; for example, when
105	>	* computing a snapshot summary of the values in a shared registry.
106	>	* There are three kinds of operation, each with four forms, accepting
107	>	* functions with Keys, Values, Entries, and (Key, Value) arguments
108	>	* and/or return values. Because the elements of a ConcurrentHashMapV8
109	>	* are not ordered in any particular way, and may be processed in
110	>	* different orders in different parallel executions, the correctness
111	>	* of supplied functions should not depend on any ordering, or on any
112	>	* other objects or values that may transiently change while
113	>	* computation is in progress; and except for forEach actions, should
114	>	* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry}
115	>	* objects do not support method {@code setValue}.
116		*
117		* <ul>
118		* <li> forEach: Perform a given action on each element.
#	Line 167 | Line 139 | import java.io.Serializable;
139		* <li> Reductions to scalar doubles, longs, and ints, using a
140		* given basis value.</li>
141		*
170	–	* </li>
142		* </ul>
143	+	* </li>
144		* </ul>
145		*
146	+	* <p>These bulk operations accept a {@code parallelismThreshold}
147	+	* argument. Methods proceed sequentially if the current map size is
148	+	* estimated to be less than the given threshold. Using a value of
149	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
150	+	* of {@code 1} results in maximal parallelism by partitioning into
151	+	* enough subtasks to fully utilize the {@link
152	+	* ForkJoinPool#commonPool()} that is used for all parallel
153	+	* computations. Normally, you would initially choose one of these
154	+	* extreme values, and then measure performance of using in-between
155	+	* values that trade off overhead versus throughput.
156	+	*
157		* <p>The concurrency properties of bulk operations follow
158		* from those of ConcurrentHashMapV8: Any non-null result returned
159		* from {@code get(key)} and related access methods bears a
#	Line 213 | Line 196 | import java.io.Serializable;
196		* exceptions, or would have done so if the first exception had
197		* not occurred.
198		*
199	<	* <p>Parallel speedups for bulk operations compared to sequential
200	<	* processing are common but not guaranteed.  Operations involving
201	<	* brief functions on small maps may execute more slowly than
202	<	* sequential loops if the underlying work to parallelize the
203	<	* computation is more expensive than the computation itself.
204	<	* Similarly, parallelization may not lead to much actual parallelism
205	<	* if all processors are busy performing unrelated tasks.
199	>	* <p>Speedups for parallel compared to sequential forms are common
200	>	* but not guaranteed.  Parallel operations involving brief functions
201	>	* on small maps may execute more slowly than sequential forms if the
202	>	* underlying work to parallelize the computation is more expensive
203	>	* than the computation itself.  Similarly, parallelization may not
204	>	* lead to much actual parallelism if all processors are busy
205	>	* performing unrelated tasks.
206		*
207		* <p>All arguments to all task methods must be non-null.
208		*
#	Line 236 | Line 219 | import java.io.Serializable;
219		* @param <K> the type of keys maintained by this map
220		* @param <V> the type of mapped values
221		*/
222	<	public class ConcurrentHashMapV8<K, V>
223	<	implements ConcurrentMap<K, V>, Serializable {
222	>	public class ConcurrentHashMapV8<K,V> extends AbstractMap<K,V>
223	>	implements ConcurrentMap<K,V>, Serializable {
224		private static final long serialVersionUID = 7249069246763182397L;
225
226		/**
227	<	* A partitionable iterator. A Spliterator can be traversed
228	<	* directly, but can also be partitioned (before traversal) by
229	<	* creating another Spliterator that covers a non-overlapping
247	<	* portion of the elements, and so may be amenable to parallel
248	<	* execution.
249	<	*
250	<	* <p>This interface exports a subset of expected JDK8
251	<	* functionality.
252	<	*
253	<	* <p>Sample usage: Here is one (of the several) ways to compute
254	<	* the sum of the values held in a map using the ForkJoin
255	<	* framework. As illustrated here, Spliterators are well suited to
256	<	* designs in which a task repeatedly splits off half its work
257	<	* into forked subtasks until small enough to process directly,
258	<	* and then joins these subtasks. Variants of this style can also
259	<	* be used in completion-based designs.
260	<	*
261	<	* <pre>
262	<	* {@code ConcurrentHashMapV8<String, Long> m = ...
263	<	* // split as if have 8 * parallelism, for load balance
264	<	* int n = m.size();
265	<	* int p = aForkJoinPool.getParallelism() * 8;
266	<	* int split = (n < p)? n : p;
267	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
268	<	* // ...
269	<	* static class SumValues extends RecursiveTask<Long> {
270	<	*   final Spliterator<Long> s;
271	<	*   final int split;             // split while > 1
272	<	*   final SumValues nextJoin;    // records forked subtasks to join
273	<	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
274	<	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
275	<	*   }
276	<	*   public Long compute() {
277	<	*     long sum = 0;
278	<	*     SumValues subtasks = null; // fork subtasks
279	<	*     for (int s = split >>> 1; s > 0; s >>>= 1)
280	<	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
281	<	*     while (s.hasNext())        // directly process remaining elements
282	<	*       sum += s.next();
283	<	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
284	<	*       sum += t.join();         // collect subtask results
285	<	*     return sum;
286	<	*   }
287	<	* }
288	<	* }</pre>
227	>	* An object for traversing and partitioning elements of a source.
228	>	* This interface provides a subset of the functionality of JDK8
229	>	* java.util.Spliterator.
230		*/
231	<	public static interface Spliterator<T> extends Iterator<T> {
231	>	public static interface ConcurrentHashMapSpliterator<T> {
232		/**
233	<	* Returns a Spliterator covering approximately half of the
234	<	* elements, guaranteed not to overlap with those subsequently
235	<	* returned by this Spliterator.  After invoking this method,
236	<	* the current Spliterator will <em>not</em> produce any of
296	<	* the elements of the returned Spliterator, but the two
297	<	* Spliterators together will produce all of the elements that
298	<	* would have been produced by this Spliterator had this
299	<	* method not been called. The exact number of elements
300	<	* produced by the returned Spliterator is not guaranteed, and
301	<	* may be zero (i.e., with {@code hasNext()} reporting {@code
302	<	* false}) if this Spliterator cannot be further split.
303	<	*
304	<	* @return a Spliterator covering approximately half of the
305	<	* elements
306	<	* @throws IllegalStateException if this Spliterator has
307	<	* already commenced traversing elements
233	>	* If possible, returns a new spliterator covering
234	>	* approximately one half of the elements, which will not be
235	>	* covered by this spliterator. Returns null if cannot be
236	>	* split.
237		*/
238	<	Spliterator<T> split();
238	>	ConcurrentHashMapSpliterator<T> trySplit();
239	>	/**
240	>	* Returns an estimate of the number of elements covered by
241	>	* this Spliterator.
242	>	*/
243	>	long estimateSize();
244	>
245	>	/** Applies the action to each untraversed element */
246	>	void forEachRemaining(Action<? super T> action);
247	>	/** If an element remains, applies the action and returns true. */
248	>	boolean tryAdvance(Action<? super T> action);
249		}
250
251	+	// Sams
252	+	/** Interface describing a void action of one argument */
253	+	public interface Action<A> { void apply(A a); }
254	+	/** Interface describing a void action of two arguments */
255	+	public interface BiAction<A,B> { void apply(A a, B b); }
256	+	/** Interface describing a function of one argument */
257	+	public interface Fun<A,T> { T apply(A a); }
258	+	/** Interface describing a function of two arguments */
259	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
260	+	/** Interface describing a function mapping its argument to a double */
261	+	public interface ObjectToDouble<A> { double apply(A a); }
262	+	/** Interface describing a function mapping its argument to a long */
263	+	public interface ObjectToLong<A> { long apply(A a); }
264	+	/** Interface describing a function mapping its argument to an int */
265	+	public interface ObjectToInt<A> {int apply(A a); }
266	+	/** Interface describing a function mapping two arguments to a double */
267	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
268	+	/** Interface describing a function mapping two arguments to a long */
269	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
270	+	/** Interface describing a function mapping two arguments to an int */
271	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
272	+	/** Interface describing a function mapping two doubles to a double */
273	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
274	+	/** Interface describing a function mapping two longs to a long */
275	+	public interface LongByLongToLong { long apply(long a, long b); }
276	+	/** Interface describing a function mapping two ints to an int */
277	+	public interface IntByIntToInt { int apply(int a, int b); }
278	+
279
280		/*
281		* Overview:
#	Line 320 | Line 287 | public class ConcurrentHashMapV8<K, V>
287		* the same or better than java.util.HashMap, and to support high
288		* initial insertion rates on an empty table by many threads.
289		*
290	<	* Each key-value mapping is held in a Node.  Because Node fields
291	<	* can contain special values, they are defined using plain Object
292	<	* types. Similarly in turn, all internal methods that use them
293	<	* work off Object types. And similarly, so do the internal
294	<	* methods of auxiliary iterator and view classes.  All public
295	<	* generic typed methods relay in/out of these internal methods,
296	<	* supplying null-checks and casts as needed. This also allows
297	<	* many of the public methods to be factored into a smaller number
298	<	* of internal methods (although sadly not so for the five
299	<	* variants of put-related operations). The validation-based
300	<	* approach explained below leads to a lot of code sprawl because
301	<	* retry-control precludes factoring into smaller methods.
290	>	* This map usually acts as a binned (bucketed) hash table.  Each
291	>	* key-value mapping is held in a Node.  Most nodes are instances
292	>	* of the basic Node class with hash, key, value, and next
293	>	* fields. However, various subclasses exist: TreeNodes are
294	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
295	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
296	>	* of bins during resizing. ReservationNodes are used as
297	>	* placeholders while establishing values in computeIfAbsent and
298	>	* related methods.  The types TreeBin, ForwardingNode, and
299	>	* ReservationNode do not hold normal user keys, values, or
300	>	* hashes, and are readily distinguishable during search etc
301	>	* because they have negative hash fields and null key and value
302	>	* fields. (These special nodes are either uncommon or transient,
303	>	* so the impact of carrying around some unused fields is
304	>	* insignificant.)
305		*
306		* The table is lazily initialized to a power-of-two size upon the
307		* first insertion.  Each bin in the table normally contains a
#	Line 339 | Line 309 | public class ConcurrentHashMapV8<K, V>
309		* Table accesses require volatile/atomic reads, writes, and
310		* CASes.  Because there is no other way to arrange this without
311		* adding further indirections, we use intrinsics
312	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
313	<	* are always accurately traversable under volatile reads, so long
314	<	* as lookups check hash code and non-nullness of value before
315	<	* checking key equality.
316	<	*
317	<	* We use the top two bits of Node hash fields for control
348	<	* purposes -- they are available anyway because of addressing
349	<	* constraints.  As explained further below, these top bits are
350	<	* used as follows:
351	<	*  00 - Normal
352	<	*  01 - Locked
353	<	*  11 - Locked and may have a thread waiting for lock
354	<	*  10 - Node is a forwarding node
355	<	*
356	<	* The lower 30 bits of each Node's hash field contain a
357	<	* transformation of the key's hash code, except for forwarding
358	<	* nodes, for which the lower bits are zero (and so always have
359	<	* hash field == MOVED).
312	>	* (sun.misc.Unsafe) operations.
313	>	*
314	>	* We use the top (sign) bit of Node hash fields for control
315	>	* purposes -- it is available anyway because of addressing
316	>	* constraints.  Nodes with negative hash fields are specially
317	>	* handled or ignored in map methods.
318		*
319		* Insertion (via put or its variants) of the first node in an
320		* empty bin is performed by just CASing it to the bin.  This is
#	Line 365 | Line 323 | public class ConcurrentHashMapV8<K, V>
323		* delete, and replace) require locks.  We do not want to waste
324		* the space required to associate a distinct lock object with
325		* each bin, so instead use the first node of a bin list itself as
326	<	* a lock. Blocking support for these locks relies on the builtin
327	<	* "synchronized" monitors.  However, we also need a tryLock
370	<	* construction, so we overlay these by using bits of the Node
371	<	* hash field for lock control (see above), and so normally use
372	<	* builtin monitors only for blocking and signalling using
373	<	* wait/notifyAll constructions. See Node.tryAwaitLock.
326	>	* a lock. Locking support for these locks relies on builtin
327	>	* "synchronized" monitors.
328		*
329		* Using the first node of a list as a lock does not by itself
330		* suffice though: When a node is locked, any update must first
331		* validate that it is still the first node after locking it, and
332		* retry if not. Because new nodes are always appended to lists,
333		* once a node is first in a bin, it remains first until deleted
334	<	* or the bin becomes invalidated (upon resizing).  However,
381	<	* operations that only conditionally update may inspect nodes
382	<	* until the point of update. This is a converse of sorts to the
383	<	* lazy locking technique described by Herlihy & Shavit.
334	>	* or the bin becomes invalidated (upon resizing).
335		*
336		* The main disadvantage of per-bin locks is that other update
337		* operations on other nodes in a bin list protected by the same
#	Line 413 | Line 364 | public class ConcurrentHashMapV8<K, V>
364		* sometimes deviate significantly from uniform randomness.  This
365		* includes the case when N > (1<<30), so some keys MUST collide.
366		* Similarly for dumb or hostile usages in which multiple keys are
367	<	* designed to have identical hash codes. Also, although we guard
368	<	* against the worst effects of this (see method spread), sets of
369	<	* hashes may differ only in bits that do not impact their bin
370	<	* index for a given power-of-two mask.  So we use a secondary
371	<	* strategy that applies when the number of nodes in a bin exceeds
372	<	* a threshold, and at least one of the keys implements
422	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
423	<	* (a specialized form of red-black trees), bounding search time
424	<	* to O(log N).  Each search step in a TreeBin is around twice as
367	>	* designed to have identical hash codes or ones that differs only
368	>	* in masked-out high bits. So we use a secondary strategy that
369	>	* applies when the number of nodes in a bin exceeds a
370	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
371	>	* specialized form of red-black trees), bounding search time to
372	>	* O(log N).  Each search step in a TreeBin is at least twice as
373		* slow as in a regular list, but given that N cannot exceed
374		* (1<<64) (before running out of addresses) this bounds search
375		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 432 | Line 380 | public class ConcurrentHashMapV8<K, V>
380		* iterators in the same way.
381		*
382		* The table is resized when occupancy exceeds a percentage
383	<	* threshold (nominally, 0.75, but see below).  Only a single
384	<	* thread performs the resize (using field "sizeCtl", to arrange
385	<	* exclusion), but the table otherwise remains usable for reads
386	<	* and updates. Resizing proceeds by transferring bins, one by
387	<	* one, from the table to the next table.  Because we are using
388	<	* power-of-two expansion, the elements from each bin must either
389	<	* stay at same index, or move with a power of two offset. We
390	<	* eliminate unnecessary node creation by catching cases where old
391	<	* nodes can be reused because their next fields won't change.  On
392	<	* average, only about one-sixth of them need cloning when a table
393	<	* doubles. The nodes they replace will be garbage collectable as
394	<	* soon as they are no longer referenced by any reader thread that
395	<	* may be in the midst of concurrently traversing table.  Upon
396	<	* transfer, the old table bin contains only a special forwarding
397	<	* node (with hash field "MOVED") that contains the next table as
398	<	* its key. On encountering a forwarding node, access and update
399	<	* operations restart, using the new table.
400	<	*
401	<	* Each bin transfer requires its bin lock. However, unlike other
402	<	* cases, a transfer can skip a bin if it fails to acquire its
403	<	* lock, and revisit it later (unless it is a TreeBin). Method
404	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
405	<	* have been skipped because of failure to acquire a lock, and
406	<	* blocks only if none are available (i.e., only very rarely).
407	<	* The transfer operation must also ensure that all accessible
408	<	* bins in both the old and new table are usable by any traversal.
409	<	* When there are no lock acquisition failures, this is arranged
410	<	* simply by proceeding from the last bin (table.length - 1) up
411	<	* towards the first.  Upon seeing a forwarding node, traversals
412	<	* (see class Iter) arrange to move to the new table
413	<	* without revisiting nodes.  However, when any node is skipped
414	<	* during a transfer, all earlier table bins may have become
415	<	* visible, so are initialized with a reverse-forwarding node back
416	<	* to the old table until the new ones are established. (This
417	<	* sometimes requires transiently locking a forwarding node, which
418	<	* is possible under the above encoding.) These more expensive
419	<	* mechanics trigger only when necessary.
383	>	* threshold (nominally, 0.75, but see below).  Any thread
384	>	* noticing an overfull bin may assist in resizing after the
385	>	* initiating thread allocates and sets up the replacement array.
386	>	* However, rather than stalling, these other threads may proceed
387	>	* with insertions etc.  The use of TreeBins shields us from the
388	>	* worst case effects of overfilling while resizes are in
389	>	* progress.  Resizing proceeds by transferring bins, one by one,
390	>	* from the table to the next table. However, threads claim small
391	>	* blocks of indices to transfer (via field transferIndex) before
392	>	* doing so, reducing contention.  A generation stamp in field
393	>	* sizeCtl ensures that resizings do not overlap. Because we are
394	>	* using power-of-two expansion, the elements from each bin must
395	>	* either stay at same index, or move with a power of two
396	>	* offset. We eliminate unnecessary node creation by catching
397	>	* cases where old nodes can be reused because their next fields
398	>	* won't change.  On average, only about one-sixth of them need
399	>	* cloning when a table doubles. The nodes they replace will be
400	>	* garbage collectable as soon as they are no longer referenced by
401	>	* any reader thread that may be in the midst of concurrently
402	>	* traversing table.  Upon transfer, the old table bin contains
403	>	* only a special forwarding node (with hash field "MOVED") that
404	>	* contains the next table as its key. On encountering a
405	>	* forwarding node, access and update operations restart, using
406	>	* the new table.
407	>	*
408	>	* Each bin transfer requires its bin lock, which can stall
409	>	* waiting for locks while resizing. However, because other
410	>	* threads can join in and help resize rather than contend for
411	>	* locks, average aggregate waits become shorter as resizing
412	>	* progresses.  The transfer operation must also ensure that all
413	>	* accessible bins in both the old and new table are usable by any
414	>	* traversal.  This is arranged in part by proceeding from the
415	>	* last bin (table.length - 1) up towards the first.  Upon seeing
416	>	* a forwarding node, traversals (see class Traverser) arrange to
417	>	* move to the new table without revisiting nodes.  To ensure that
418	>	* no intervening nodes are skipped even when moved out of order,
419	>	* a stack (see class TableStack) is created on first encounter of
420	>	* a forwarding node during a traversal, to maintain its place if
421	>	* later processing the current table. The need for these
422	>	* save/restore mechanics is relatively rare, but when one
423	>	* forwarding node is encountered, typically many more will be.
424	>	* So Traversers use a simple caching scheme to avoid creating so
425	>	* many new TableStack nodes. (Thanks to Peter Levart for
426	>	* suggesting use of a stack here.)
427		*
428		* The traversal scheme also applies to partial traversals of
429		* ranges of bins (via an alternate Traverser constructor)
#	Line 483 | Line 438 | public class ConcurrentHashMapV8<K, V>
438		* These cases attempt to override the initial capacity settings,
439		* but harmlessly fail to take effect in cases of races.
440		*
441	<	* The element count is maintained using a LongAdder, which avoids
442	<	* contention on updates but can encounter cache thrashing if read
443	<	* too frequently during concurrent access. To avoid reading so
444	<	* often, resizing is attempted either when a bin lock is
445	<	* contended, or upon adding to a bin already holding two or more
446	<	* nodes (checked before adding in the xIfAbsent methods, after
447	<	* adding in others). Under uniform hash distributions, the
448	<	* probability of this occurring at threshold is around 13%,
449	<	* meaning that only about 1 in 8 puts check threshold (and after
450	<	* resizing, many fewer do so). But this approximation has high
451	<	* variance for small table sizes, so we check on any collision
452	<	* for sizes <= 64. The bulk putAll operation further reduces
453	<	* contention by only committing count updates upon these size
454	<	* checks.
441	>	* The element count is maintained using a specialization of
442	>	* LongAdder. We need to incorporate a specialization rather than
443	>	* just use a LongAdder in order to access implicit
444	>	* contention-sensing that leads to creation of multiple
445	>	* CounterCells.  The counter mechanics avoid contention on
446	>	* updates but can encounter cache thrashing if read too
447	>	* frequently during concurrent access. To avoid reading so often,
448	>	* resizing under contention is attempted only upon adding to a
449	>	* bin already holding two or more nodes. Under uniform hash
450	>	* distributions, the probability of this occurring at threshold
451	>	* is around 13%, meaning that only about 1 in 8 puts check
452	>	* threshold (and after resizing, many fewer do so).
453	>	*
454	>	* TreeBins use a special form of comparison for search and
455	>	* related operations (which is the main reason we cannot use
456	>	* existing collections such as TreeMaps). TreeBins contain
457	>	* Comparable elements, but may contain others, as well as
458	>	* elements that are Comparable but not necessarily Comparable for
459	>	* the same T, so we cannot invoke compareTo among them. To handle
460	>	* this, the tree is ordered primarily by hash value, then by
461	>	* Comparable.compareTo order if applicable.  On lookup at a node,
462	>	* if elements are not comparable or compare as 0 then both left
463	>	* and right children may need to be searched in the case of tied
464	>	* hash values. (This corresponds to the full list search that
465	>	* would be necessary if all elements were non-Comparable and had
466	>	* tied hashes.) On insertion, to keep a total ordering (or as
467	>	* close as is required here) across rebalancings, we compare
468	>	* classes and identityHashCodes as tie-breakers. The red-black
469	>	* balancing code is updated from pre-jdk-collections
470	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
471	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
472	>	* Algorithms" (CLR).
473	>	*
474	>	* TreeBins also require an additional locking mechanism.  While
475	>	* list traversal is always possible by readers even during
476	>	* updates, tree traversal is not, mainly because of tree-rotations
477	>	* that may change the root node and/or its linkages.  TreeBins
478	>	* include a simple read-write lock mechanism parasitic on the
479	>	* main bin-synchronization strategy: Structural adjustments
480	>	* associated with an insertion or removal are already bin-locked
481	>	* (and so cannot conflict with other writers) but must wait for
482	>	* ongoing readers to finish. Since there can be only one such
483	>	* waiter, we use a simple scheme using a single "waiter" field to
484	>	* block writers.  However, readers need never block.  If the root
485	>	* lock is held, they proceed along the slow traversal path (via
486	>	* next-pointers) until the lock becomes available or the list is
487	>	* exhausted, whichever comes first. These cases are not fast, but
488	>	* maximize aggregate expected throughput.
489		*
490		* Maintaining API and serialization compatibility with previous
491		* versions of this class introduces several oddities. Mainly: We
#	Line 506 | Line 495 | public class ConcurrentHashMapV8<K, V>
495		* time that we can guarantee to honor it.) We also declare an
496		* unused "Segment" class that is instantiated in minimal form
497		* only when serializing.
498	+	*
499	+	* Also, solely for compatibility with previous versions of this
500	+	* class, it extends AbstractMap, even though all of its methods
501	+	* are overridden, so it is just useless baggage.
502	+	*
503	+	* This file is organized to make things a little easier to follow
504	+	* while reading than they might otherwise: First the main static
505	+	* declarations and utilities, then fields, then main public
506	+	* methods (with a few factorings of multiple public methods into
507	+	* internal ones), then sizing methods, trees, traversers, and
508	+	* bulk operations.
509		*/
510
511		/* ---------------- Constants -------------- */
#	Line 547 | Line 547 | public class ConcurrentHashMapV8<K, V>
547		private static final float LOAD_FACTOR = 0.75f;
548
549		/**
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.
550	>	* The bin count threshold for using a tree rather than list for a
551	>	* bin.  Bins are converted to trees when adding an element to a
552	>	* bin with at least this many nodes. The value must be greater
553	>	* than 2, and should be at least 8 to mesh with assumptions in
554	>	* tree removal about conversion back to plain bins upon
555	>	* shrinkage.
556		*/
557	<	private static final int TRANSFER_BUFFER_SIZE = 32;
557	>	static final int TREEIFY_THRESHOLD = 8;
558
559		/**
560	<	* The bin count threshold for using a tree rather than list for a
561	<	* bin.  The value reflects the approximate break-even point for
562	<	* using tree-based operations.
560	>	* The bin count threshold for untreeifying a (split) bin during a
561	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
562	>	* most 6 to mesh with shrinkage detection under removal.
563		*/
564	<	private static final int TREE_THRESHOLD = 8;
564	>	static final int UNTREEIFY_THRESHOLD = 6;
565
566	<	/*
567	<	* Encodings for special uses of Node hash fields. See above for
568	<	* explanation.
566	>	/**
567	>	* The smallest table capacity for which bins may be treeified.
568	>	* (Otherwise the table is resized if too many nodes in a bin.)
569	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
570	>	* conflicts between resizing and treeification thresholds.
571		*/
572	<	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 -------------- */
572	>	static final int MIN_TREEIFY_CAPACITY = 64;
573
574		/**
575	<	* The array of bins. Lazily initialized upon first insertion.
576	<	* Size is always a power of two. Accessed directly by iterators.
575	>	* Minimum number of rebinnings per transfer step. Ranges are
576	>	* subdivided to allow multiple resizer threads.  This value
577	>	* serves as a lower bound to avoid resizers encountering
578	>	* excessive memory contention.  The value should be at least
579	>	* DEFAULT_CAPACITY.
580		*/
581	<	transient volatile Node[] table;
581	>	private static final int MIN_TRANSFER_STRIDE = 16;
582
583		/**
584	<	* The counter maintaining number of elements.
584	>	* The number of bits used for generation stamp in sizeCtl.
585	>	* Must be at least 6 for 32bit arrays.
586		*/
587	<	private transient final LongAdder counter;
587	>	private static int RESIZE_STAMP_BITS = 16;
588
589		/**
590	<	* Table initialization and resizing control.  When negative, the
591	<	* table is being initialized or resized. Otherwise, when table is
588	<	* null, holds the initial table size to use upon creation, or 0
589	<	* for default. After initialization, holds the next element count
590	<	* value upon which to resize the table.
590	>	* The maximum number of threads that can help resize.
591	>	* Must fit in 32 - RESIZE_STAMP_BITS bits.
592		*/
593	<	private transient volatile int sizeCtl;
593	>	private static final int MAX_RESIZERS = (1 << (32 - RESIZE_STAMP_BITS)) - 1;
594
595	<	// views
596	<	private transient KeySetView<K,V> keySet;
597	<	private transient ValuesView<K,V> values;
598	<	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 -------------- */
595	>	/**
596	>	* The bit shift for recording size stamp in sizeCtl.
597	>	*/
598	>	private static final int RESIZE_STAMP_SHIFT = 32 - RESIZE_STAMP_BITS;
599
600		/*
601	<	* 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.
601	>	* Encodings for Node hash fields. See above for explanation.
602		*/
603	<
604	<	static final Node tabAt(Node[] tab, int i) { // used by Iter
605	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
606	<	}
607	<
608	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
609	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
610	<	}
611	<
612	<	private static final void setTabAt(Node[] tab, int i, Node v) {
613	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
614	<	}
603	>	static final int MOVED     = -1; // hash for forwarding nodes
604	>	static final int TREEBIN   = -2; // hash for roots of trees
605	>	static final int RESERVED  = -3; // hash for transient reservations
606	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
607	>
608	>	/** Number of CPUS, to place bounds on some sizings */
609	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
610	>
611	>	/** For serialization compatibility. */
612	>	private static final ObjectStreamField[] serialPersistentFields = {
613	>	new ObjectStreamField("segments", Segment[].class),
614	>	new ObjectStreamField("segmentMask", Integer.TYPE),
615	>	new ObjectStreamField("segmentShift", Integer.TYPE)
616	>	};
617
618		/* ---------------- Nodes -------------- */
619
620		/**
621	<	* Key-value entry. Note that this is never exported out as a
622	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
623	<	* field of MOVED are special, and do not contain user keys or
624	<	* values.  Otherwise, keys are never null, and null val fields
625	<	* indicate that a node is in the process of being deleted or
626	<	* created. For purposes of read-only access, a key may be read
627	<	* before a val, but can only be used after checking val to be
628	<	* non-null.
629	<	*/
630	<	static class Node {
631	<	volatile int hash;
632	<	final Object key;
643	<	volatile Object val;
644	<	volatile Node next;
621	>	* Key-value entry.  This class is never exported out as a
622	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
623	>	* MapEntry below), but can be used for read-only traversals used
624	>	* in bulk tasks.  Subclasses of Node with a negative hash field
625	>	* are special, and contain null keys and values (but are never
626	>	* exported).  Otherwise, keys and vals are never null.
627	>	*/
628	>	static class Node<K,V> implements Map.Entry<K,V> {
629	>	final int hash;
630	>	final K key;
631	>	volatile V val;
632	>	volatile Node<K,V> next;
633
634	<	Node(int hash, Object key, Object val, Node next) {
634	>	Node(int hash, K key, V val, Node<K,V> next) {
635		this.hash = hash;
636		this.key = key;
637		this.val = val;
638		this.next = next;
639		}
640
641	<	/** CompareAndSet the hash field */
642	<	final boolean casHash(int cmp, int val) {
643	<	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
644	<	}
645	<
646	<	/** The number of spins before blocking for a lock */
659	<	static final int MAX_SPINS =
660	<	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
661	<
662	<	/**
663	<	* Spins a while if LOCKED bit set and this node is the first
664	<	* of its bin, and then sets WAITING bits on hash field and
665	<	* blocks (once) if they are still set.  It is OK for this
666	<	* method to return even if lock is not available upon exit,
667	<	* which enables these simple single-wait mechanics.
668	<	*
669	<	* The corresponding signalling operation is performed within
670	<	* callers: Upon detecting that WAITING has been set when
671	<	* unlocking lock (via a failed CAS from non-waiting LOCKED
672	<	* state), unlockers acquire the sync lock and perform a
673	<	* notifyAll.
674	<	*
675	<	* The initial sanity check on tab and bounds is not currently
676	<	* necessary in the only usages of this method, but enables
677	<	* use in other future contexts.
678	<	*/
679	<	final void tryAwaitLock(Node[] tab, int i) {
680	<	if (tab != null && i >= 0 && i < tab.length) { // sanity check
681	<	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
682	<	int spins = MAX_SPINS, h;
683	<	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
684	<	if (spins >= 0) {
685	<	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
686	<	if (r >= 0 && --spins == 0)
687	<	Thread.yield();  // yield before block
688	<	}
689	<	else if (casHash(h, h | WAITING)) {
690	<	synchronized (this) {
691	<	if (tabAt(tab, i) == this &&
692	<	(hash & WAITING) == WAITING) {
693	<	try {
694	<	wait();
695	<	} catch (InterruptedException ie) {
696	<	try {
697	<	Thread.currentThread().interrupt();
698	<	} catch (SecurityException ignore) {
699	<	}
700	<	}
701	<	}
702	<	else
703	<	notifyAll(); // possibly won race vs signaller
704	<	}
705	<	break;
706	<	}
707	<	}
708	<	}
709	<	}
710	<
711	<	// Unsafe mechanics for casHash
712	<	private static final sun.misc.Unsafe UNSAFE;
713	<	private static final long hashOffset;
714	<
715	<	static {
716	<	try {
717	<	UNSAFE = getUnsafe();
718	<	Class<?> k = Node.class;
719	<	hashOffset = UNSAFE.objectFieldOffset
720	<	(k.getDeclaredField("hash"));
721	<	} catch (Exception e) {
722	<	throw new Error(e);
723	<	}
724	<	}
725	<	}
726	<
727	<	/* ---------------- TreeBins -------------- */
728	<
729	<	/**
730	<	* Nodes for use in TreeBins
731	<	*/
732	<	static final class TreeNode extends Node {
733	<	TreeNode parent;  // red-black tree links
734	<	TreeNode left;
735	<	TreeNode right;
736	<	TreeNode prev;    // needed to unlink next upon deletion
737	<	boolean red;
738	<
739	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
740	<	super(hash, key, val, next);
741	<	this.parent = parent;
742	<	}
743	<	}
744	<
745	<	/**
746	<	* A specialized form of red-black tree for use in bins
747	<	* whose size exceeds a threshold.
748	<	*
749	<	* TreeBins use a special form of comparison for search and
750	<	* related operations (which is the main reason we cannot use
751	<	* existing collections such as TreeMaps). TreeBins contain
752	<	* Comparable elements, but may contain others, as well as
753	<	* elements that are Comparable but not necessarily Comparable<T>
754	<	* for the same T, so we cannot invoke compareTo among them. To
755	<	* handle this, the tree is ordered primarily by hash value, then
756	<	* by getClass().getName() order, and then by Comparator order
757	<	* among elements of the same class.  On lookup at a node, if
758	<	* elements are not comparable or compare as 0, both left and
759	<	* right children may need to be searched in the case of tied hash
760	<	* values. (This corresponds to the full list search that would be
761	<	* necessary if all elements were non-Comparable and had tied
762	<	* hashes.)  The red-black balancing code is updated from
763	<	* pre-jdk-collections
764	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
765	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
766	<	* Algorithms" (CLR).
767	<	*
768	<	* TreeBins also maintain a separate locking discipline than
769	<	* regular bins. Because they are forwarded via special MOVED
770	<	* nodes at bin heads (which can never change once established),
771	<	* we cannot use those nodes as locks. Instead, TreeBin
772	<	* extends AbstractQueuedSynchronizer to support a simple form of
773	<	* read-write lock. For update operations and table validation,
774	<	* the exclusive form of lock behaves in the same way as bin-head
775	<	* locks. However, lookups use shared read-lock mechanics to allow
776	<	* multiple readers in the absence of writers.  Additionally,
777	<	* these lookups do not ever block: While the lock is not
778	<	* available, they proceed along the slow traversal path (via
779	<	* next-pointers) until the lock becomes available or the list is
780	<	* exhausted, whichever comes first. (These cases are not fast,
781	<	* but maximize aggregate expected throughput.)  The AQS mechanics
782	<	* for doing this are straightforward.  The lock state is held as
783	<	* AQS getState().  Read counts are negative; the write count (1)
784	<	* is positive.  There are no signalling preferences among readers
785	<	* and writers. Since we don't need to export full Lock API, we
786	<	* just override the minimal AQS methods and use them directly.
787	<	*/
788	<	static final class TreeBin extends AbstractQueuedSynchronizer {
789	<	private static final long serialVersionUID = 2249069246763182397L;
790	<	transient TreeNode root;  // root of tree
791	<	transient TreeNode first; // head of next-pointer list
792	<
793	<	/* AQS overrides */
794	<	public final boolean isHeldExclusively() { return getState() > 0; }
795	<	public final boolean tryAcquire(int ignore) {
796	<	if (compareAndSetState(0, 1)) {
797	<	setExclusiveOwnerThread(Thread.currentThread());
798	<	return true;
799	<	}
800	<	return false;
801	<	}
802	<	public final boolean tryRelease(int ignore) {
803	<	setExclusiveOwnerThread(null);
804	<	setState(0);
805	<	return true;
806	<	}
807	<	public final int tryAcquireShared(int ignore) {
808	<	for (int c;;) {
809	<	if ((c = getState()) > 0)
810	<	return -1;
811	<	if (compareAndSetState(c, c -1))
812	<	return 1;
813	<	}
814	<	}
815	<	public final boolean tryReleaseShared(int ignore) {
816	<	int c;
817	<	do {} while (!compareAndSetState(c = getState(), c + 1));
818	<	return c == -1;
819	<	}
820	<
821	<	/** From CLR */
822	<	private void rotateLeft(TreeNode p) {
823	<	if (p != null) {
824	<	TreeNode r = p.right, pp, rl;
825	<	if ((rl = p.right = r.left) != null)
826	<	rl.parent = p;
827	<	if ((pp = r.parent = p.parent) == null)
828	<	root = r;
829	<	else if (pp.left == p)
830	<	pp.left = r;
831	<	else
832	<	pp.right = r;
833	<	r.left = p;
834	<	p.parent = r;
835	<	}
836	<	}
837	<
838	<	/** From CLR */
839	<	private void rotateRight(TreeNode p) {
840	<	if (p != null) {
841	<	TreeNode l = p.left, pp, lr;
842	<	if ((lr = p.left = l.right) != null)
843	<	lr.parent = p;
844	<	if ((pp = l.parent = p.parent) == null)
845	<	root = l;
846	<	else if (pp.right == p)
847	<	pp.right = l;
848	<	else
849	<	pp.left = l;
850	<	l.right = p;
851	<	p.parent = l;
852	<	}
853	<	}
854	<
855	<	/**
856	<	* Returns the TreeNode (or null if not found) for the given key
857	<	* starting at given root.
858	<	*/
859	<	@SuppressWarnings("unchecked") final TreeNode getTreeNode
860	<	(int h, Object k, TreeNode p) {
861	<	Class<?> c = k.getClass();
862	<	while (p != null) {
863	<	int dir, ph;  Object pk; Class<?> pc;
864	<	if ((ph = p.hash) == h) {
865	<	if ((pk = p.key) == k || k.equals(pk))
866	<	return p;
867	<	if (c != (pc = pk.getClass()) ||
868	<	!(k instanceof Comparable) ||
869	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
870	<	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;
886	<	}
887	<	return null;
641	>	public final K getKey()       { return key; }
642	>	public final V getValue()     { return val; }
643	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
644	>	public final String toString(){ return key + "=" + val; }
645	>	public final V setValue(V value) {
646	>	throw new UnsupportedOperationException();
647		}
648
649	<	/**
650	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
651	<	* read-lock to call getTreeNode, but during failure to get
652	<	* lock, searches along next links.
653	<	*/
654	<	final Object getValue(int h, Object k) {
655	<	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;
649	>	public final boolean equals(Object o) {
650	>	Object k, v, u; Map.Entry<?,?> e;
651	>	return ((o instanceof Map.Entry) &&
652	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
653	>	(v = e.getValue()) != null &&
654	>	(k == key || k.equals(key)) &&
655	>	(v == (u = val) || v.equals(u)));
656		}
657
658		/**
659	<	* Finds or adds a node.
919	<	* @return null if added
659	>	* Virtualized support for map.get(); overridden in subclasses.
660		*/
661	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
662	<	(int h, Object k, Object v) {
663	<	Class<?> c = k.getClass();
664	<	TreeNode pp = root, p = null;
665	<	int dir = 0;
666	<	while (pp != null) { // find existing node or leaf to insert at
667	<	int ph;  Object pk; Class<?> pc;
668	<	p = pp;
669	<	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;
661	>	Node<K,V> find(int h, Object k) {
662	>	Node<K,V> e = this;
663	>	if (k != null) {
664	>	do {
665	>	K ek;
666	>	if (e.hash == h &&
667	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
668	>	return e;
669	>	} while ((e = e.next) != null);
670		}
671		return null;
672		}
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	–	}
673		}
674
675	<	/* ---------------- Collision reduction methods -------------- */
675	>	/* ---------------- Static utilities -------------- */
676
677		/**
678	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
679	<	* Because the table uses power-of-two masking, sets of hashes
680	<	* that vary only in bits above the current mask will always
681	<	* collide. (Among known examples are sets of Float keys holding
682	<	* consecutive whole numbers in small tables.)  To counter this,
683	<	* we apply a transform that spreads the impact of higher bits
678	>	* Spreads (XORs) higher bits of hash to lower and also forces top
679	>	* bit to 0. Because the table uses power-of-two masking, sets of
680	>	* hashes that vary only in bits above the current mask will
681	>	* always collide. (Among known examples are sets of Float keys
682	>	* holding consecutive whole numbers in small tables.)  So we
683	>	* apply a transform that spreads the impact of higher bits
684		* downward. There is a tradeoff between speed, utility, and
685		* quality of bit-spreading. Because many common sets of hashes
686	<	* are already reasonably distributed across bits (so don't benefit
687	<	* from spreading), and because we use trees to handle large sets
688	<	* of collisions in bins, we don't need excessively high quality.
689	<	*/
690	<	private static final int spread(int h) {
691	<	h ^= (h >>> 18) ^ (h >>> 12);
1211	<	return (h ^ (h >>> 10)) & HASH_BITS;
1212	<	}
1213	<
1214	<	/**
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.
686	>	* are already reasonably distributed (so don't benefit from
687	>	* spreading), and because we use trees to handle large sets of
688	>	* collisions in bins, we just XOR some shifted bits in the
689	>	* cheapest possible way to reduce systematic lossage, as well as
690	>	* to incorporate impact of the highest bits that would otherwise
691	>	* never be used in index calculations because of table bounds.
692		*/
693	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
694	<	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;
693	>	static final int spread(int h) {
694	>	return (h ^ (h >>> 16)) & HASH_BITS;
695		}
696
697		/**
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	–	/**
698		* Returns a power of two table size for the given desired capacity.
699		* See Hackers Delight, sec 3.2
700		*/
#	Line 2044 | Line 709 | public class ConcurrentHashMapV8<K, V>
709		}
710
711		/**
712	<	* Initializes table, using the size recorded in sizeCtl.
712	>	* Returns x's Class if it is of the form "class C implements
713	>	* Comparable<C>", else null.
714		*/
715	<	private final Node[] initTable() {
716	<	Node[] tab; int sc;
717	<	while ((tab = table) == null) {
718	<	if ((sc = sizeCtl) < 0)
719	<	Thread.yield(); // lost initialization race; just spin
720	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
721	<	try {
722	<	if ((tab = table) == null) {
723	<	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
724	<	tab = table = new Node[n];
725	<	sc = n - (n >>> 2);
726	<	}
727	<	} finally {
2062	<	sizeCtl = sc;
2063	<	}
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);
715	>	static Class<?> comparableClassFor(Object x) {
716	>	if (x instanceof Comparable) {
717	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
718	>	if ((c = x.getClass()) == String.class) // bypass checks
719	>	return c;
720	>	if ((ts = c.getGenericInterfaces()) != null) {
721	>	for (int i = 0; i < ts.length; ++i) {
722	>	if (((t = ts[i]) instanceof ParameterizedType) &&
723	>	((p = (ParameterizedType)t).getRawType() ==
724	>	Comparable.class) &&
725	>	(as = p.getActualTypeArguments()) != null &&
726	>	as.length == 1 && as[0] == c) // type arg is c
727	>	return c;
728		}
2087	–	} finally {
2088	–	sizeCtl = sc;
729		}
730		}
731	+	return null;
732		}
733
734		/**
735	<	* Tries to presize table to accommodate the given number of elements.
736	<	*
2096	<	* @param size number of elements (doesn't need to be perfectly accurate)
735	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
736	>	* class), else 0.
737		*/
738	<	private final void tryPresize(int size) {
739	<	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
740	<	tableSizeFor(size + (size >>> 1) + 1);
741	<	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	<	}
738	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
739	>	static int compareComparables(Class<?> kc, Object k, Object x) {
740	>	return (x == null || x.getClass() != kc ? 0 :
741	>	((Comparable)k).compareTo(x));
742		}
743
744	+	/* ---------------- Table element access -------------- */
745	+
746		/*
747	<	* Moves and/or copies the nodes in each bin to new table. See
748	<	* above for explanation.
749	<	*
750	<	* @return the new table
751	<	*/
752	<	private static final Node[] rebuild(Node[] tab) {
753	<	int n = tab.length;
754	<	Node[] nextTab = new Node[n << 1];
755	<	Node fwd = new Node(MOVED, nextTab, null, null);
756	<	int[] buffer = null;       // holds bins to revisit; null until needed
757	<	Node rev = null;           // reverse forwarder; null until needed
758	<	int nbuffered = 0;         // the number of bins in buffer list
759	<	int bufferIndex = 0;       // buffer index of current buffered bin
760	<	int bin = n - 1;           // current non-buffered bin or -1 if none
761	<
762	<	for (int i = bin;;) {      // start upwards sweep
763	<	int fh; Node f;
764	<	if ((f = tabAt(tab, i)) == null) {
765	<	if (bin >= 0) {    // Unbuffered; no lock needed (or available)
766	<	if (!casTabAt(tab, i, f, fwd))
767	<	continue;
768	<	}
769	<	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	<	}
747	>	* Volatile access methods are used for table elements as well as
748	>	* elements of in-progress next table while resizing.  All uses of
749	>	* the tab arguments must be null checked by callers.  All callers
750	>	* also paranoically precheck that tab's length is not zero (or an
751	>	* equivalent check), thus ensuring that any index argument taking
752	>	* the form of a hash value anded with (length - 1) is a valid
753	>	* index.  Note that, to be correct wrt arbitrary concurrency
754	>	* errors by users, these checks must operate on local variables,
755	>	* which accounts for some odd-looking inline assignments below.
756	>	* Note that calls to setTabAt always occur within locked regions,
757	>	* and so in principle require only release ordering, not
758	>	* full volatile semantics, but are currently coded as volatile
759	>	* writes to be conservative.
760	>	*/
761	>
762	>	@SuppressWarnings("unchecked")
763	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
764	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
765	>	}
766	>
767	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
768	>	Node<K,V> c, Node<K,V> v) {
769	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
770		}
771
772	<	/**
773	<	* 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);
772	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
773	>	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
774		}
775
776	+	/* ---------------- Fields -------------- */
777	+
778		/**
779	<	* Splits a tree bin into lo and hi parts; installs in given table.
779	>	* The array of bins. Lazily initialized upon first insertion.
780	>	* Size is always a power of two. Accessed directly by iterators.
781		*/
782	<	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	<	}
782	>	transient volatile Node<K,V>[] table;
783
784		/**
785	<	* Implementation for clear. Steps through each bin, removing all
2309	<	* nodes.
785	>	* The next table to use; non-null only while resizing.
786		*/
787	<	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 -------------- */
787	>	private transient volatile Node<K,V>[] nextTable;
788
789		/**
790	<	* Encapsulates traversal for methods such as containsValue; also
791	<	* serves as a base class for other iterators and bulk tasks.
792	<	*
793	<	* At each step, the iterator snapshots the key ("nextKey") and
794	<	* 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	<	}
2452	<
2453	<	/**
2454	<	* Advances next; returns nextVal or null if terminated.
2455	<	* See above for explanation.
2456	<	*/
2457	<	final Object advance() {
2458	<	Node e = next;
2459	<	Object ev = null;
2460	<	outer: do {
2461	<	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	<	}
790	>	* Base counter value, used mainly when there is no contention,
791	>	* but also as a fallback during table initialization
792	>	* races. Updated via CAS.
793	>	*/
794	>	private transient volatile long baseCount;
795
796	<	public final void remove() {
797	<	Object k = nextKey;
798	<	if (k == null && (advance() == null || (k = nextKey) == null))
799	<	throw new IllegalStateException();
800	<	map.internalReplace(k, null, null);
801	<	}
796	>	/**
797	>	* Table initialization and resizing control.  When negative, the
798	>	* table is being initialized or resized: -1 for initialization,
799	>	* else -(1 + the number of active resizing threads).  Otherwise,
800	>	* when table is null, holds the initial table size to use upon
801	>	* creation, or 0 for default. After initialization, holds the
802	>	* next element count value upon which to resize the table.
803	>	*/
804	>	private transient volatile int sizeCtl;
805
806	<	public final boolean hasNext() {
807	<	return nextVal != null || advance() != null;
808	<	}
806	>	/**
807	>	* The next table index (plus one) to split while resizing.
808	>	*/
809	>	private transient volatile int transferIndex;
810
811	<	public final boolean hasMoreElements() { return hasNext(); }
811	>	/**
812	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
813	>	*/
814	>	private transient volatile int cellsBusy;
815
816	<	public void compute() { } // default no-op CountedCompleter body
816	>	/**
817	>	* Table of counter cells. When non-null, size is a power of 2.
818	>	*/
819	>	private transient volatile CounterCell[] counterCells;
820
821	<	/**
822	<	* Returns a batch value > 0 if this task should (and must) be
823	<	* split, if so, adding to pending count, and in any case
824	<	* 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	<	}
821	>	// views
822	>	private transient KeySetView<K,V> keySet;
823	>	private transient ValuesView<K,V> values;
824	>	private transient EntrySetView<K,V> entrySet;
825
2536	–	}
826
827		/* ---------------- Public operations -------------- */
828
#	Line 2541 | Line 830 | public class ConcurrentHashMapV8<K, V>
830		* Creates a new, empty map with the default initial table size (16).
831		*/
832		public ConcurrentHashMapV8() {
2544	–	this.counter = new LongAdder();
833		}
834
835		/**
#	Line 2560 | Line 848 | public class ConcurrentHashMapV8<K, V>
848		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
849		MAXIMUM_CAPACITY :
850		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2563	–	this.counter = new LongAdder();
851		this.sizeCtl = cap;
852		}
853
#	Line 2570 | Line 857 | public class ConcurrentHashMapV8<K, V>
857		* @param m the map
858		*/
859		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2573	–	this.counter = new LongAdder();
860		this.sizeCtl = DEFAULT_CAPACITY;
861	<	internalPutAll(m);
861	>	putAll(m);
862		}
863
864		/**
#	Line 2613 | Line 899 | public class ConcurrentHashMapV8<K, V>
899		* nonpositive
900		*/
901		public ConcurrentHashMapV8(int initialCapacity,
902	<	float loadFactor, int concurrencyLevel) {
902	>	float loadFactor, int concurrencyLevel) {
903		if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
904		throw new IllegalArgumentException();
905		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
#	Line 2621 | Line 907 | public class ConcurrentHashMapV8<K, V>
907		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
908		int cap = (size >= (long)MAXIMUM_CAPACITY) ?
909		MAXIMUM_CAPACITY : tableSizeFor((int)size);
2624	–	this.counter = new LongAdder();
910		this.sizeCtl = cap;
911		}
912
913	<	/**
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	<	}
913	>	// Original (since JDK1.2) Map methods
914
915		/**
916		* {@inheritDoc}
917		*/
918		public int size() {
919	<	long n = counter.sum();
919	>	long n = sumCount();
920		return ((n < 0L) ? 0 :
921		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
922		(int)n);
923		}
924
925		/**
926	<	* 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
926	>	* {@inheritDoc}
927		*/
928	<	public long mappingCount() {
929	<	long n = counter.sum();
2682	<	return (n < 0L) ? 0L : n; // ignore transient negative values
928	>	public boolean isEmpty() {
929	>	return sumCount() <= 0L; // ignore transient negative values
930		}
931
932		/**
#	Line 2693 | Line 940 | public class ConcurrentHashMapV8<K, V>
940		*
941		* @throws NullPointerException if the specified key is null
942		*/
943	<	@SuppressWarnings("unchecked") public V get(Object key) {
944	<	if (key == null)
945	<	throw new NullPointerException();
946	<	return (V)internalGet(key);
947	<	}
948	<
949	<	/**
950	<	* Returns the value to which the specified key is mapped,
951	<	* or the given defaultValue if this map contains no mapping for the key.
952	<	*
953	<	* @param key the key
954	<	* @param defaultValue the value to return if this map contains
955	<	* no mapping for the given key
956	<	* @return the mapping for the key, if present; else the defaultValue
957	<	* @throws NullPointerException if the specified key is null
958	<	*/
959	<	@SuppressWarnings("unchecked") public V getValueOrDefault(Object key, V defaultValue) {
960	<	if (key == null)
2714	<	throw new NullPointerException();
2715	<	V v = (V) internalGet(key);
2716	<	return v == null ? defaultValue : v;
943	>	public V get(Object key) {
944	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
945	>	int h = spread(key.hashCode());
946	>	if ((tab = table) != null && (n = tab.length) > 0 &&
947	>	(e = tabAt(tab, (n - 1) & h)) != null) {
948	>	if ((eh = e.hash) == h) {
949	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
950	>	return e.val;
951	>	}
952	>	else if (eh < 0)
953	>	return (p = e.find(h, key)) != null ? p.val : null;
954	>	while ((e = e.next) != null) {
955	>	if (e.hash == h &&
956	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
957	>	return e.val;
958	>	}
959	>	}
960	>	return null;
961		}
962
963		/**
964		* Tests if the specified object is a key in this table.
965		*
966	<	* @param  key   possible key
966	>	* @param  key possible key
967		* @return {@code true} if and only if the specified object
968		*         is a key in this table, as determined by the
969		*         {@code equals} method; {@code false} otherwise
970		* @throws NullPointerException if the specified key is null
971		*/
972		public boolean containsKey(Object key) {
973	<	if (key == null)
2730	<	throw new NullPointerException();
2731	<	return internalGet(key) != null;
973	>	return get(key) != null;
974		}
975
976		/**
#	Line 2744 | Line 986 | public class ConcurrentHashMapV8<K, V>
986		public boolean containsValue(Object value) {
987		if (value == null)
988		throw new NullPointerException();
989	<	Object v;
990	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
991	<	while ((v = it.advance()) != null) {
992	<	if (v == value || value.equals(v))
993	<	return true;
989	>	Node<K,V>[] t;
990	>	if ((t = table) != null) {
991	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
992	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
993	>	V v;
994	>	if ((v = p.val) == value || (v != null && value.equals(v)))
995	>	return true;
996	>	}
997		}
998		return false;
999		}
1000
1001		/**
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	–	/**
1002		* Maps the specified key to the specified value in this table.
1003		* Neither the key nor the value can be null.
1004		*
#	Line 2785 | Line 1011 | public class ConcurrentHashMapV8<K, V>
1011		*         {@code null} if there was no mapping for {@code key}
1012		* @throws NullPointerException if the specified key or value is null
1013		*/
1014	<	@SuppressWarnings("unchecked") public V put(K key, V value) {
1015	<	if (key == null || value == null)
1014	>	public V put(K key, V value) {
1015	>	return putVal(key, value, false);
1016	>	}
1017	>
1018	>	/** Implementation for put and putIfAbsent */
1019	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
1020	>	if (key == null || value == null) throw new NullPointerException();
1021	>	int hash = spread(key.hashCode());
1022	>	int binCount = 0;
1023	>	for (Node<K,V>[] tab = table;;) {
1024	>	Node<K,V> f; int n, i, fh;
1025	>	if (tab == null || (n = tab.length) == 0)
1026	>	tab = initTable();
1027	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
1028	>	if (casTabAt(tab, i, null,
1029	>	new Node<K,V>(hash, key, value, null)))
1030	>	break;                   // no lock when adding to empty bin
1031	>	}
1032	>	else if ((fh = f.hash) == MOVED)
1033	>	tab = helpTransfer(tab, f);
1034	>	else {
1035	>	V oldVal = null;
1036	>	synchronized (f) {
1037	>	if (tabAt(tab, i) == f) {
1038	>	if (fh >= 0) {
1039	>	binCount = 1;
1040	>	for (Node<K,V> e = f;; ++binCount) {
1041	>	K ek;
1042	>	if (e.hash == hash &&
1043	>	((ek = e.key) == key ||
1044	>	(ek != null && key.equals(ek)))) {
1045	>	oldVal = e.val;
1046	>	if (!onlyIfAbsent)
1047	>	e.val = value;
1048	>	break;
1049	>	}
1050	>	Node<K,V> pred = e;
1051	>	if ((e = e.next) == null) {
1052	>	pred.next = new Node<K,V>(hash, key,
1053	>	value, null);
1054	>	break;
1055	>	}
1056	>	}
1057	>	}
1058	>	else if (f instanceof TreeBin) {
1059	>	Node<K,V> p;
1060	>	binCount = 2;
1061	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1062	>	value)) != null) {
1063	>	oldVal = p.val;
1064	>	if (!onlyIfAbsent)
1065	>	p.val = value;
1066	>	}
1067	>	}
1068	>	}
1069	>	}
1070	>	if (binCount != 0) {
1071	>	if (binCount >= TREEIFY_THRESHOLD)
1072	>	treeifyBin(tab, i);
1073	>	if (oldVal != null)
1074	>	return oldVal;
1075	>	break;
1076	>	}
1077	>	}
1078	>	}
1079	>	addCount(1L, binCount);
1080	>	return null;
1081	>	}
1082	>
1083	>	/**
1084	>	* Copies all of the mappings from the specified map to this one.
1085	>	* These mappings replace any mappings that this map had for any of the
1086	>	* keys currently in the specified map.
1087	>	*
1088	>	* @param m mappings to be stored in this map
1089	>	*/
1090	>	public void putAll(Map<? extends K, ? extends V> m) {
1091	>	tryPresize(m.size());
1092	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1093	>	putVal(e.getKey(), e.getValue(), false);
1094	>	}
1095	>
1096	>	/**
1097	>	* Removes the key (and its corresponding value) from this map.
1098	>	* This method does nothing if the key is not in the map.
1099	>	*
1100	>	* @param  key the key that needs to be removed
1101	>	* @return the previous value associated with {@code key}, or
1102	>	*         {@code null} if there was no mapping for {@code key}
1103	>	* @throws NullPointerException if the specified key is null
1104	>	*/
1105	>	public V remove(Object key) {
1106	>	return replaceNode(key, null, null);
1107	>	}
1108	>
1109	>	/**
1110	>	* Implementation for the four public remove/replace methods:
1111	>	* Replaces node value with v, conditional upon match of cv if
1112	>	* non-null.  If resulting value is null, delete.
1113	>	*/
1114	>	final V replaceNode(Object key, V value, Object cv) {
1115	>	int hash = spread(key.hashCode());
1116	>	for (Node<K,V>[] tab = table;;) {
1117	>	Node<K,V> f; int n, i, fh;
1118	>	if (tab == null || (n = tab.length) == 0 ||
1119	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1120	>	break;
1121	>	else if ((fh = f.hash) == MOVED)
1122	>	tab = helpTransfer(tab, f);
1123	>	else {
1124	>	V oldVal = null;
1125	>	boolean validated = false;
1126	>	synchronized (f) {
1127	>	if (tabAt(tab, i) == f) {
1128	>	if (fh >= 0) {
1129	>	validated = true;
1130	>	for (Node<K,V> e = f, pred = null;;) {
1131	>	K ek;
1132	>	if (e.hash == hash &&
1133	>	((ek = e.key) == key ||
1134	>	(ek != null && key.equals(ek)))) {
1135	>	V ev = e.val;
1136	>	if (cv == null || cv == ev ||
1137	>	(ev != null && cv.equals(ev))) {
1138	>	oldVal = ev;
1139	>	if (value != null)
1140	>	e.val = value;
1141	>	else if (pred != null)
1142	>	pred.next = e.next;
1143	>	else
1144	>	setTabAt(tab, i, e.next);
1145	>	}
1146	>	break;
1147	>	}
1148	>	pred = e;
1149	>	if ((e = e.next) == null)
1150	>	break;
1151	>	}
1152	>	}
1153	>	else if (f instanceof TreeBin) {
1154	>	validated = true;
1155	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1156	>	TreeNode<K,V> r, p;
1157	>	if ((r = t.root) != null &&
1158	>	(p = r.findTreeNode(hash, key, null)) != null) {
1159	>	V pv = p.val;
1160	>	if (cv == null || cv == pv ||
1161	>	(pv != null && cv.equals(pv))) {
1162	>	oldVal = pv;
1163	>	if (value != null)
1164	>	p.val = value;
1165	>	else if (t.removeTreeNode(p))
1166	>	setTabAt(tab, i, untreeify(t.first));
1167	>	}
1168	>	}
1169	>	}
1170	>	}
1171	>	}
1172	>	if (validated) {
1173	>	if (oldVal != null) {
1174	>	if (value == null)
1175	>	addCount(-1L, -1);
1176	>	return oldVal;
1177	>	}
1178	>	break;
1179	>	}
1180	>	}
1181	>	}
1182	>	return null;
1183	>	}
1184	>
1185	>	/**
1186	>	* Removes all of the mappings from this map.
1187	>	*/
1188	>	public void clear() {
1189	>	long delta = 0L; // negative number of deletions
1190	>	int i = 0;
1191	>	Node<K,V>[] tab = table;
1192	>	while (tab != null && i < tab.length) {
1193	>	int fh;
1194	>	Node<K,V> f = tabAt(tab, i);
1195	>	if (f == null)
1196	>	++i;
1197	>	else if ((fh = f.hash) == MOVED) {
1198	>	tab = helpTransfer(tab, f);
1199	>	i = 0; // restart
1200	>	}
1201	>	else {
1202	>	synchronized (f) {
1203	>	if (tabAt(tab, i) == f) {
1204	>	Node<K,V> p = (fh >= 0 ? f :
1205	>	(f instanceof TreeBin) ?
1206	>	((TreeBin<K,V>)f).first : null);
1207	>	while (p != null) {
1208	>	--delta;
1209	>	p = p.next;
1210	>	}
1211	>	setTabAt(tab, i++, null);
1212	>	}
1213	>	}
1214	>	}
1215	>	}
1216	>	if (delta != 0L)
1217	>	addCount(delta, -1);
1218	>	}
1219	>
1220	>	/**
1221	>	* Returns a {@link Set} view of the keys contained in this map.
1222	>	* The set is backed by the map, so changes to the map are
1223	>	* reflected in the set, and vice-versa. The set supports element
1224	>	* removal, which removes the corresponding mapping from this map,
1225	>	* via the {@code Iterator.remove}, {@code Set.remove},
1226	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1227	>	* operations.  It does not support the {@code add} or
1228	>	* {@code addAll} operations.
1229	>	*
1230	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1231	>	* that will never throw {@link ConcurrentModificationException},
1232	>	* and guarantees to traverse elements as they existed upon
1233	>	* construction of the iterator, and may (but is not guaranteed to)
1234	>	* reflect any modifications subsequent to construction.
1235	>	*
1236	>	* @return the set view
1237	>	*/
1238	>	public KeySetView<K,V> keySet() {
1239	>	KeySetView<K,V> ks;
1240	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1241	>	}
1242	>
1243	>	/**
1244	>	* Returns a {@link Collection} view of the values contained in this map.
1245	>	* The collection is backed by the map, so changes to the map are
1246	>	* reflected in the collection, and vice-versa.  The collection
1247	>	* supports element removal, which removes the corresponding
1248	>	* mapping from this map, via the {@code Iterator.remove},
1249	>	* {@code Collection.remove}, {@code removeAll},
1250	>	* {@code retainAll}, and {@code clear} operations.  It does not
1251	>	* support the {@code add} or {@code addAll} operations.
1252	>	*
1253	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1254	>	* that will never throw {@link ConcurrentModificationException},
1255	>	* and guarantees to traverse elements as they existed upon
1256	>	* construction of the iterator, and may (but is not guaranteed to)
1257	>	* reflect any modifications subsequent to construction.
1258	>	*
1259	>	* @return the collection view
1260	>	*/
1261	>	public Collection<V> values() {
1262	>	ValuesView<K,V> vs;
1263	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1264	>	}
1265	>
1266	>	/**
1267	>	* Returns a {@link Set} view of the mappings contained in this map.
1268	>	* The set is backed by the map, so changes to the map are
1269	>	* reflected in the set, and vice-versa.  The set supports element
1270	>	* removal, which removes the corresponding mapping from the map,
1271	>	* via the {@code Iterator.remove}, {@code Set.remove},
1272	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1273	>	* operations.
1274	>	*
1275	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1276	>	* that will never throw {@link ConcurrentModificationException},
1277	>	* and guarantees to traverse elements as they existed upon
1278	>	* construction of the iterator, and may (but is not guaranteed to)
1279	>	* reflect any modifications subsequent to construction.
1280	>	*
1281	>	* @return the set view
1282	>	*/
1283	>	public Set<Map.Entry<K,V>> entrySet() {
1284	>	EntrySetView<K,V> es;
1285	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1286	>	}
1287	>
1288	>	/**
1289	>	* Returns the hash code value for this {@link Map}, i.e.,
1290	>	* the sum of, for each key-value pair in the map,
1291	>	* {@code key.hashCode() ^ value.hashCode()}.
1292	>	*
1293	>	* @return the hash code value for this map
1294	>	*/
1295	>	public int hashCode() {
1296	>	int h = 0;
1297	>	Node<K,V>[] t;
1298	>	if ((t = table) != null) {
1299	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1300	>	for (Node<K,V> p; (p = it.advance()) != null; )
1301	>	h += p.key.hashCode() ^ p.val.hashCode();
1302	>	}
1303	>	return h;
1304	>	}
1305	>
1306	>	/**
1307	>	* Returns a string representation of this map.  The string
1308	>	* representation consists of a list of key-value mappings (in no
1309	>	* particular order) enclosed in braces ("{@code {}}").  Adjacent
1310	>	* mappings are separated by the characters {@code ", "} (comma
1311	>	* and space).  Each key-value mapping is rendered as the key
1312	>	* followed by an equals sign ("{@code =}") followed by the
1313	>	* associated value.
1314	>	*
1315	>	* @return a string representation of this map
1316	>	*/
1317	>	public String toString() {
1318	>	Node<K,V>[] t;
1319	>	int f = (t = table) == null ? 0 : t.length;
1320	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1321	>	StringBuilder sb = new StringBuilder();
1322	>	sb.append('{');
1323	>	Node<K,V> p;
1324	>	if ((p = it.advance()) != null) {
1325	>	for (;;) {
1326	>	K k = p.key;
1327	>	V v = p.val;
1328	>	sb.append(k == this ? "(this Map)" : k);
1329	>	sb.append('=');
1330	>	sb.append(v == this ? "(this Map)" : v);
1331	>	if ((p = it.advance()) == null)
1332	>	break;
1333	>	sb.append(',').append(' ');
1334	>	}
1335	>	}
1336	>	return sb.append('}').toString();
1337	>	}
1338	>
1339	>	/**
1340	>	* Compares the specified object with this map for equality.
1341	>	* Returns {@code true} if the given object is a map with the same
1342	>	* mappings as this map.  This operation may return misleading
1343	>	* results if either map is concurrently modified during execution
1344	>	* of this method.
1345	>	*
1346	>	* @param o object to be compared for equality with this map
1347	>	* @return {@code true} if the specified object is equal to this map
1348	>	*/
1349	>	public boolean equals(Object o) {
1350	>	if (o != this) {
1351	>	if (!(o instanceof Map))
1352	>	return false;
1353	>	Map<?,?> m = (Map<?,?>) o;
1354	>	Node<K,V>[] t;
1355	>	int f = (t = table) == null ? 0 : t.length;
1356	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1357	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1358	>	V val = p.val;
1359	>	Object v = m.get(p.key);
1360	>	if (v == null || (v != val && !v.equals(val)))
1361	>	return false;
1362	>	}
1363	>	for (Map.Entry<?,?> e : m.entrySet()) {
1364	>	Object mk, mv, v;
1365	>	if ((mk = e.getKey()) == null ||
1366	>	(mv = e.getValue()) == null ||
1367	>	(v = get(mk)) == null ||
1368	>	(mv != v && !mv.equals(v)))
1369	>	return false;
1370	>	}
1371	>	}
1372	>	return true;
1373	>	}
1374	>
1375	>	/**
1376	>	* Stripped-down version of helper class used in previous version,
1377	>	* declared for the sake of serialization compatibility
1378	>	*/
1379	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1380	>	private static final long serialVersionUID = 2249069246763182397L;
1381	>	final float loadFactor;
1382	>	Segment(float lf) { this.loadFactor = lf; }
1383	>	}
1384	>
1385	>	/**
1386	>	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
1387	>	* stream (i.e., serializes it).
1388	>	* @param s the stream
1389	>	* @throws java.io.IOException if an I/O error occurs
1390	>	* @serialData
1391	>	* the key (Object) and value (Object)
1392	>	* for each key-value mapping, followed by a null pair.
1393	>	* The key-value mappings are emitted in no particular order.
1394	>	*/
1395	>	private void writeObject(java.io.ObjectOutputStream s)
1396	>	throws java.io.IOException {
1397	>	// For serialization compatibility
1398	>	// Emulate segment calculation from previous version of this class
1399	>	int sshift = 0;
1400	>	int ssize = 1;
1401	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1402	>	++sshift;
1403	>	ssize <<= 1;
1404	>	}
1405	>	int segmentShift = 32 - sshift;
1406	>	int segmentMask = ssize - 1;
1407	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1408	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1409	>	for (int i = 0; i < segments.length; ++i)
1410	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1411	>	s.putFields().put("segments", segments);
1412	>	s.putFields().put("segmentShift", segmentShift);
1413	>	s.putFields().put("segmentMask", segmentMask);
1414	>	s.writeFields();
1415	>
1416	>	Node<K,V>[] t;
1417	>	if ((t = table) != null) {
1418	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1419	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1420	>	s.writeObject(p.key);
1421	>	s.writeObject(p.val);
1422	>	}
1423	>	}
1424	>	s.writeObject(null);
1425	>	s.writeObject(null);
1426	>	segments = null; // throw away
1427	>	}
1428	>
1429	>	/**
1430	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1431	>	* @param s the stream
1432	>	* @throws ClassNotFoundException if the class of a serialized object
1433	>	*         could not be found
1434	>	* @throws java.io.IOException if an I/O error occurs
1435	>	*/
1436	>	private void readObject(java.io.ObjectInputStream s)
1437	>	throws java.io.IOException, ClassNotFoundException {
1438	>	/*
1439	>	* To improve performance in typical cases, we create nodes
1440	>	* while reading, then place in table once size is known.
1441	>	* However, we must also validate uniqueness and deal with
1442	>	* overpopulated bins while doing so, which requires
1443	>	* specialized versions of putVal mechanics.
1444	>	*/
1445	>	sizeCtl = -1; // force exclusion for table construction
1446	>	s.defaultReadObject();
1447	>	long size = 0L;
1448	>	Node<K,V> p = null;
1449	>	for (;;) {
1450	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1451	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1452	>	if (k != null && v != null) {
1453	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1454	>	++size;
1455	>	}
1456	>	else
1457	>	break;
1458	>	}
1459	>	if (size == 0L)
1460	>	sizeCtl = 0;
1461	>	else {
1462	>	int n;
1463	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1464	>	n = MAXIMUM_CAPACITY;
1465	>	else {
1466	>	int sz = (int)size;
1467	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1468	>	}
1469	>	@SuppressWarnings("unchecked")
1470	>	Node<K,V>[] tab = (Node<K,V>[])new Node<?,?>[n];
1471	>	int mask = n - 1;
1472	>	long added = 0L;
1473	>	while (p != null) {
1474	>	boolean insertAtFront;
1475	>	Node<K,V> next = p.next, first;
1476	>	int h = p.hash, j = h & mask;
1477	>	if ((first = tabAt(tab, j)) == null)
1478	>	insertAtFront = true;
1479	>	else {
1480	>	K k = p.key;
1481	>	if (first.hash < 0) {
1482	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1483	>	if (t.putTreeVal(h, k, p.val) == null)
1484	>	++added;
1485	>	insertAtFront = false;
1486	>	}
1487	>	else {
1488	>	int binCount = 0;
1489	>	insertAtFront = true;
1490	>	Node<K,V> q; K qk;
1491	>	for (q = first; q != null; q = q.next) {
1492	>	if (q.hash == h &&
1493	>	((qk = q.key) == k ||
1494	>	(qk != null && k.equals(qk)))) {
1495	>	insertAtFront = false;
1496	>	break;
1497	>	}
1498	>	++binCount;
1499	>	}
1500	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1501	>	insertAtFront = false;
1502	>	++added;
1503	>	p.next = first;
1504	>	TreeNode<K,V> hd = null, tl = null;
1505	>	for (q = p; q != null; q = q.next) {
1506	>	TreeNode<K,V> t = new TreeNode<K,V>
1507	>	(q.hash, q.key, q.val, null, null);
1508	>	if ((t.prev = tl) == null)
1509	>	hd = t;
1510	>	else
1511	>	tl.next = t;
1512	>	tl = t;
1513	>	}
1514	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1515	>	}
1516	>	}
1517	>	}
1518	>	if (insertAtFront) {
1519	>	++added;
1520	>	p.next = first;
1521	>	setTabAt(tab, j, p);
1522	>	}
1523	>	p = next;
1524	>	}
1525	>	table = tab;
1526	>	sizeCtl = n - (n >>> 2);
1527	>	baseCount = added;
1528	>	}
1529	>	}
1530	>
1531	>	// ConcurrentMap methods
1532	>
1533	>	/**
1534	>	* {@inheritDoc}
1535	>	*
1536	>	* @return the previous value associated with the specified key,
1537	>	*         or {@code null} if there was no mapping for the key
1538	>	* @throws NullPointerException if the specified key or value is null
1539	>	*/
1540	>	public V putIfAbsent(K key, V value) {
1541	>	return putVal(key, value, true);
1542	>	}
1543	>
1544	>	/**
1545	>	* {@inheritDoc}
1546	>	*
1547	>	* @throws NullPointerException if the specified key is null
1548	>	*/
1549	>	public boolean remove(Object key, Object value) {
1550	>	if (key == null)
1551		throw new NullPointerException();
1552	<	return (V)internalPut(key, value);
1552	>	return value != null && replaceNode(key, null, value) != null;
1553	>	}
1554	>
1555	>	/**
1556	>	* {@inheritDoc}
1557	>	*
1558	>	* @throws NullPointerException if any of the arguments are null
1559	>	*/
1560	>	public boolean replace(K key, V oldValue, V newValue) {
1561	>	if (key == null || oldValue == null || newValue == null)
1562	>	throw new NullPointerException();
1563	>	return replaceNode(key, newValue, oldValue) != null;
1564		}
1565
1566		/**
#	Line 2798 | Line 1570 | public class ConcurrentHashMapV8<K, V>
1570		*         or {@code null} if there was no mapping for the key
1571		* @throws NullPointerException if the specified key or value is null
1572		*/
1573	<	@SuppressWarnings("unchecked") public V putIfAbsent(K key, V value) {
1573	>	public V replace(K key, V value) {
1574		if (key == null || value == null)
1575		throw new NullPointerException();
1576	<	return (V)internalPutIfAbsent(key, value);
1576	>	return replaceNode(key, value, null);
1577		}
1578
1579	+	// Overrides of JDK8+ Map extension method defaults
1580	+
1581		/**
1582	<	* Copies all of the mappings from the specified map to this one.
1583	<	* These mappings replace any mappings that this map had for any of the
1584	<	* keys currently in the specified map.
1582	>	* Returns the value to which the specified key is mapped, or the
1583	>	* given default value if this map contains no mapping for the
1584	>	* key.
1585		*
1586	<	* @param m mappings to be stored in this map
1586	>	* @param key the key whose associated value is to be returned
1587	>	* @param defaultValue the value to return if this map contains
1588	>	* no mapping for the given key
1589	>	* @return the mapping for the key, if present; else the default value
1590	>	* @throws NullPointerException if the specified key is null
1591		*/
1592	<	public void putAll(Map<? extends K, ? extends V> m) {
1593	<	internalPutAll(m);
1592	>	public V getOrDefault(Object key, V defaultValue) {
1593	>	V v;
1594	>	return (v = get(key)) == null ? defaultValue : v;
1595	>	}
1596	>
1597	>	public void forEach(BiAction<? super K, ? super V> action) {
1598	>	if (action == null) throw new NullPointerException();
1599	>	Node<K,V>[] t;
1600	>	if ((t = table) != null) {
1601	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1602	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1603	>	action.apply(p.key, p.val);
1604	>	}
1605	>	}
1606	>	}
1607	>
1608	>	public void replaceAll(BiFun<? super K, ? super V, ? extends V> function) {
1609	>	if (function == null) throw new NullPointerException();
1610	>	Node<K,V>[] t;
1611	>	if ((t = table) != null) {
1612	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1613	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1614	>	V oldValue = p.val;
1615	>	for (K key = p.key;;) {
1616	>	V newValue = function.apply(key, oldValue);
1617	>	if (newValue == null)
1618	>	throw new NullPointerException();
1619	>	if (replaceNode(key, newValue, oldValue) != null ||
1620	>	(oldValue = get(key)) == null)
1621	>	break;
1622	>	}
1623	>	}
1624	>	}
1625		}
1626
1627		/**
1628		* If the specified key is not already associated with a value,
1629	<	* computes its value using the given mappingFunction and enters
1630	<	* it into the map unless null.  This is equivalent to
1631	<	* <pre> {@code
1632	<	* if (map.containsKey(key))
1633	<	*   return map.get(key);
1634	<	* value = mappingFunction.apply(key);
1635	<	* 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>
1629	>	* attempts to compute its value using the given mapping function
1630	>	* and enters it into this map unless {@code null}.  The entire
1631	>	* method invocation is performed atomically, so the function is
1632	>	* applied at most once per key.  Some attempted update operations
1633	>	* on this map by other threads may be blocked while computation
1634	>	* is in progress, so the computation should be short and simple,
1635	>	* and must not attempt to update any other mappings of this map.
1636		*
1637		* @param key key with which the specified value is to be associated
1638		* @param mappingFunction the function to compute a value
#	Line 2854 | Line 1646 | public class ConcurrentHashMapV8<K, V>
1646		* @throws RuntimeException or Error if the mappingFunction does so,
1647		*         in which case the mapping is left unestablished
1648		*/
1649	<	@SuppressWarnings("unchecked") public V computeIfAbsent
2858	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
1649	>	public V computeIfAbsent(K key, Fun<? super K, ? extends V> mappingFunction) {
1650		if (key == null || mappingFunction == null)
1651		throw new NullPointerException();
1652	<	return (V)internalComputeIfAbsent(key, mappingFunction);
1652	>	int h = spread(key.hashCode());
1653	>	V val = null;
1654	>	int binCount = 0;
1655	>	for (Node<K,V>[] tab = table;;) {
1656	>	Node<K,V> f; int n, i, fh;
1657	>	if (tab == null || (n = tab.length) == 0)
1658	>	tab = initTable();
1659	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1660	>	Node<K,V> r = new ReservationNode<K,V>();
1661	>	synchronized (r) {
1662	>	if (casTabAt(tab, i, null, r)) {
1663	>	binCount = 1;
1664	>	Node<K,V> node = null;
1665	>	try {
1666	>	if ((val = mappingFunction.apply(key)) != null)
1667	>	node = new Node<K,V>(h, key, val, null);
1668	>	} finally {
1669	>	setTabAt(tab, i, node);
1670	>	}
1671	>	}
1672	>	}
1673	>	if (binCount != 0)
1674	>	break;
1675	>	}
1676	>	else if ((fh = f.hash) == MOVED)
1677	>	tab = helpTransfer(tab, f);
1678	>	else {
1679	>	boolean added = false;
1680	>	synchronized (f) {
1681	>	if (tabAt(tab, i) == f) {
1682	>	if (fh >= 0) {
1683	>	binCount = 1;
1684	>	for (Node<K,V> e = f;; ++binCount) {
1685	>	K ek; V ev;
1686	>	if (e.hash == h &&
1687	>	((ek = e.key) == key ||
1688	>	(ek != null && key.equals(ek)))) {
1689	>	val = e.val;
1690	>	break;
1691	>	}
1692	>	Node<K,V> pred = e;
1693	>	if ((e = e.next) == null) {
1694	>	if ((val = mappingFunction.apply(key)) != null) {
1695	>	added = true;
1696	>	pred.next = new Node<K,V>(h, key, val, null);
1697	>	}
1698	>	break;
1699	>	}
1700	>	}
1701	>	}
1702	>	else if (f instanceof TreeBin) {
1703	>	binCount = 2;
1704	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1705	>	TreeNode<K,V> r, p;
1706	>	if ((r = t.root) != null &&
1707	>	(p = r.findTreeNode(h, key, null)) != null)
1708	>	val = p.val;
1709	>	else if ((val = mappingFunction.apply(key)) != null) {
1710	>	added = true;
1711	>	t.putTreeVal(h, key, val);
1712	>	}
1713	>	}
1714	>	}
1715	>	}
1716	>	if (binCount != 0) {
1717	>	if (binCount >= TREEIFY_THRESHOLD)
1718	>	treeifyBin(tab, i);
1719	>	if (!added)
1720	>	return val;
1721	>	break;
1722	>	}
1723	>	}
1724	>	}
1725	>	if (val != null)
1726	>	addCount(1L, binCount);
1727	>	return val;
1728		}
1729
1730		/**
1731	<	* If the given key is present, computes a new mapping value given a key and
1732	<	* its current mapped value. This is equivalent to
1733	<	*  <pre> {@code
1734	<	*   if (map.containsKey(key)) {
1735	<	*     value = remappingFunction.apply(key, map.get(key));
1736	<	*     if (value != null)
1737	<	*       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:
1731	>	* If the value for the specified key is present, attempts to
1732	>	* compute a new mapping given the key and its current mapped
1733	>	* value.  The entire method invocation is performed atomically.
1734	>	* Some attempted update operations on this map by other threads
1735	>	* may be blocked while computation is in progress, so the
1736	>	* computation should be short and simple, and must not attempt to
1737	>	* update any other mappings of this map.
1738		*
1739	<	* @param key key with which the specified value is to be associated
1739	>	* @param key key with which a value may be associated
1740		* @param remappingFunction the function to compute a value
1741		* @return the new value associated with the specified key, or null if none
1742		* @throws NullPointerException if the specified key or remappingFunction
#	Line 2895 | Line 1747 | public class ConcurrentHashMapV8<K, V>
1747		* @throws RuntimeException or Error if the remappingFunction does so,
1748		*         in which case the mapping is unchanged
1749		*/
1750	<	@SuppressWarnings("unchecked") public V computeIfPresent
2899	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1750	>	public V computeIfPresent(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1751		if (key == null || remappingFunction == null)
1752		throw new NullPointerException();
1753	<	return (V)internalCompute(key, true, remappingFunction);
1753	>	int h = spread(key.hashCode());
1754	>	V val = null;
1755	>	int delta = 0;
1756	>	int binCount = 0;
1757	>	for (Node<K,V>[] tab = table;;) {
1758	>	Node<K,V> f; int n, i, fh;
1759	>	if (tab == null || (n = tab.length) == 0)
1760	>	tab = initTable();
1761	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1762	>	break;
1763	>	else if ((fh = f.hash) == MOVED)
1764	>	tab = helpTransfer(tab, f);
1765	>	else {
1766	>	synchronized (f) {
1767	>	if (tabAt(tab, i) == f) {
1768	>	if (fh >= 0) {
1769	>	binCount = 1;
1770	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1771	>	K ek;
1772	>	if (e.hash == h &&
1773	>	((ek = e.key) == key ||
1774	>	(ek != null && key.equals(ek)))) {
1775	>	val = remappingFunction.apply(key, e.val);
1776	>	if (val != null)
1777	>	e.val = val;
1778	>	else {
1779	>	delta = -1;
1780	>	Node<K,V> en = e.next;
1781	>	if (pred != null)
1782	>	pred.next = en;
1783	>	else
1784	>	setTabAt(tab, i, en);
1785	>	}
1786	>	break;
1787	>	}
1788	>	pred = e;
1789	>	if ((e = e.next) == null)
1790	>	break;
1791	>	}
1792	>	}
1793	>	else if (f instanceof TreeBin) {
1794	>	binCount = 2;
1795	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1796	>	TreeNode<K,V> r, p;
1797	>	if ((r = t.root) != null &&
1798	>	(p = r.findTreeNode(h, key, null)) != null) {
1799	>	val = remappingFunction.apply(key, p.val);
1800	>	if (val != null)
1801	>	p.val = val;
1802	>	else {
1803	>	delta = -1;
1804	>	if (t.removeTreeNode(p))
1805	>	setTabAt(tab, i, untreeify(t.first));
1806	>	}
1807	>	}
1808	>	}
1809	>	}
1810	>	}
1811	>	if (binCount != 0)
1812	>	break;
1813	>	}
1814	>	}
1815	>	if (delta != 0)
1816	>	addCount((long)delta, binCount);
1817	>	return val;
1818		}
1819
1820		/**
1821	<	* Computes a new mapping value given a key and
1822	<	* its current mapped value (or {@code null} if there is no current
1823	<	* mapping). This is equivalent to
1824	<	*  <pre> {@code
1825	<	*   value = remappingFunction.apply(key, map.get(key));
1826	<	*   if (value != null)
1827	<	*     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>
1821	>	* Attempts to compute a mapping for the specified key and its
1822	>	* current mapped value (or {@code null} if there is no current
1823	>	* mapping). The entire method invocation is performed atomically.
1824	>	* Some attempted update operations on this map by other threads
1825	>	* may be blocked while computation is in progress, so the
1826	>	* computation should be short and simple, and must not attempt to
1827	>	* update any other mappings of this Map.
1828		*
1829		* @param key key with which the specified value is to be associated
1830		* @param remappingFunction the function to compute a value
#	Line 2942 | Line 1837 | public class ConcurrentHashMapV8<K, V>
1837		* @throws RuntimeException or Error if the remappingFunction does so,
1838		*         in which case the mapping is unchanged
1839		*/
1840	<	@SuppressWarnings("unchecked") public V compute
1841	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1840	>	public V compute(K key,
1841	>	BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1842		if (key == null || remappingFunction == null)
1843		throw new NullPointerException();
1844	<	return (V)internalCompute(key, false, remappingFunction);
1844	>	int h = spread(key.hashCode());
1845	>	V val = null;
1846	>	int delta = 0;
1847	>	int binCount = 0;
1848	>	for (Node<K,V>[] tab = table;;) {
1849	>	Node<K,V> f; int n, i, fh;
1850	>	if (tab == null || (n = tab.length) == 0)
1851	>	tab = initTable();
1852	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1853	>	Node<K,V> r = new ReservationNode<K,V>();
1854	>	synchronized (r) {
1855	>	if (casTabAt(tab, i, null, r)) {
1856	>	binCount = 1;
1857	>	Node<K,V> node = null;
1858	>	try {
1859	>	if ((val = remappingFunction.apply(key, null)) != null) {
1860	>	delta = 1;
1861	>	node = new Node<K,V>(h, key, val, null);
1862	>	}
1863	>	} finally {
1864	>	setTabAt(tab, i, node);
1865	>	}
1866	>	}
1867	>	}
1868	>	if (binCount != 0)
1869	>	break;
1870	>	}
1871	>	else if ((fh = f.hash) == MOVED)
1872	>	tab = helpTransfer(tab, f);
1873	>	else {
1874	>	synchronized (f) {
1875	>	if (tabAt(tab, i) == f) {
1876	>	if (fh >= 0) {
1877	>	binCount = 1;
1878	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1879	>	K ek;
1880	>	if (e.hash == h &&
1881	>	((ek = e.key) == key ||
1882	>	(ek != null && key.equals(ek)))) {
1883	>	val = remappingFunction.apply(key, e.val);
1884	>	if (val != null)
1885	>	e.val = val;
1886	>	else {
1887	>	delta = -1;
1888	>	Node<K,V> en = e.next;
1889	>	if (pred != null)
1890	>	pred.next = en;
1891	>	else
1892	>	setTabAt(tab, i, en);
1893	>	}
1894	>	break;
1895	>	}
1896	>	pred = e;
1897	>	if ((e = e.next) == null) {
1898	>	val = remappingFunction.apply(key, null);
1899	>	if (val != null) {
1900	>	delta = 1;
1901	>	pred.next =
1902	>	new Node<K,V>(h, key, val, null);
1903	>	}
1904	>	break;
1905	>	}
1906	>	}
1907	>	}
1908	>	else if (f instanceof TreeBin) {
1909	>	binCount = 1;
1910	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1911	>	TreeNode<K,V> r, p;
1912	>	if ((r = t.root) != null)
1913	>	p = r.findTreeNode(h, key, null);
1914	>	else
1915	>	p = null;
1916	>	V pv = (p == null) ? null : p.val;
1917	>	val = remappingFunction.apply(key, pv);
1918	>	if (val != null) {
1919	>	if (p != null)
1920	>	p.val = val;
1921	>	else {
1922	>	delta = 1;
1923	>	t.putTreeVal(h, key, val);
1924	>	}
1925	>	}
1926	>	else if (p != null) {
1927	>	delta = -1;
1928	>	if (t.removeTreeNode(p))
1929	>	setTabAt(tab, i, untreeify(t.first));
1930	>	}
1931	>	}
1932	>	}
1933	>	}
1934	>	if (binCount != 0) {
1935	>	if (binCount >= TREEIFY_THRESHOLD)
1936	>	treeifyBin(tab, i);
1937	>	break;
1938	>	}
1939	>	}
1940	>	}
1941	>	if (delta != 0)
1942	>	addCount((long)delta, binCount);
1943	>	return val;
1944		}
1945
1946		/**
1947	<	* If the specified key is not already associated
1948	<	* with a value, associate it with the given value.
1949	<	* Otherwise, replace the value with the results of
1950	<	* the given remapping function. This is equivalent to:
1951	<	*  <pre> {@code
1952	<	*   if (!map.containsKey(key))
1953	<	*     map.put(value);
1954	<	*   else {
1955	<	*     newValue = remappingFunction.apply(map.get(key), value);
1956	<	*     if (value != null)
1957	<	*       map.put(key, value);
1958	<	*     else
1959	<	*       map.remove(key);
1960	<	*   }
1961	<	* }</pre>
1962	<	* except that the action is performed atomically.  If the
1963	<	* function returns {@code null}, the mapping is removed.  If the
1964	<	* 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.
1947	>	* If the specified key is not already associated with a
1948	>	* (non-null) value, associates it with the given value.
1949	>	* Otherwise, replaces the value with the results of the given
1950	>	* remapping function, or removes if {@code null}. The entire
1951	>	* method invocation is performed atomically.  Some attempted
1952	>	* update operations on this map by other threads may be blocked
1953	>	* while computation is in progress, so the computation should be
1954	>	* short and simple, and must not attempt to update any other
1955	>	* mappings of this Map.
1956	>	*
1957	>	* @param key key with which the specified value is to be associated
1958	>	* @param value the value to use if absent
1959	>	* @param remappingFunction the function to recompute a value if present
1960	>	* @return the new value associated with the specified key, or null if none
1961	>	* @throws NullPointerException if the specified key or the
1962	>	*         remappingFunction is null
1963	>	* @throws RuntimeException or Error if the remappingFunction does so,
1964	>	*         in which case the mapping is unchanged
1965		*/
1966	<	@SuppressWarnings("unchecked") public V merge
2978	<	(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1966	>	public V merge(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1967		if (key == null || value == null || remappingFunction == null)
1968		throw new NullPointerException();
1969	<	return (V)internalMerge(key, value, remappingFunction);
1969	>	int h = spread(key.hashCode());
1970	>	V val = null;
1971	>	int delta = 0;
1972	>	int binCount = 0;
1973	>	for (Node<K,V>[] tab = table;;) {
1974	>	Node<K,V> f; int n, i, fh;
1975	>	if (tab == null || (n = tab.length) == 0)
1976	>	tab = initTable();
1977	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1978	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1979	>	delta = 1;
1980	>	val = value;
1981	>	break;
1982	>	}
1983	>	}
1984	>	else if ((fh = f.hash) == MOVED)
1985	>	tab = helpTransfer(tab, f);
1986	>	else {
1987	>	synchronized (f) {
1988	>	if (tabAt(tab, i) == f) {
1989	>	if (fh >= 0) {
1990	>	binCount = 1;
1991	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1992	>	K ek;
1993	>	if (e.hash == h &&
1994	>	((ek = e.key) == key ||
1995	>	(ek != null && key.equals(ek)))) {
1996	>	val = remappingFunction.apply(e.val, value);
1997	>	if (val != null)
1998	>	e.val = val;
1999	>	else {
2000	>	delta = -1;
2001	>	Node<K,V> en = e.next;
2002	>	if (pred != null)
2003	>	pred.next = en;
2004	>	else
2005	>	setTabAt(tab, i, en);
2006	>	}
2007	>	break;
2008	>	}
2009	>	pred = e;
2010	>	if ((e = e.next) == null) {
2011	>	delta = 1;
2012	>	val = value;
2013	>	pred.next =
2014	>	new Node<K,V>(h, key, val, null);
2015	>	break;
2016	>	}
2017	>	}
2018	>	}
2019	>	else if (f instanceof TreeBin) {
2020	>	binCount = 2;
2021	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2022	>	TreeNode<K,V> r = t.root;
2023	>	TreeNode<K,V> p = (r == null) ? null :
2024	>	r.findTreeNode(h, key, null);
2025	>	val = (p == null) ? value :
2026	>	remappingFunction.apply(p.val, value);
2027	>	if (val != null) {
2028	>	if (p != null)
2029	>	p.val = val;
2030	>	else {
2031	>	delta = 1;
2032	>	t.putTreeVal(h, key, val);
2033	>	}
2034	>	}
2035	>	else if (p != null) {
2036	>	delta = -1;
2037	>	if (t.removeTreeNode(p))
2038	>	setTabAt(tab, i, untreeify(t.first));
2039	>	}
2040	>	}
2041	>	}
2042	>	}
2043	>	if (binCount != 0) {
2044	>	if (binCount >= TREEIFY_THRESHOLD)
2045	>	treeifyBin(tab, i);
2046	>	break;
2047	>	}
2048	>	}
2049	>	}
2050	>	if (delta != 0)
2051	>	addCount((long)delta, binCount);
2052	>	return val;
2053		}
2054
2055	+	// Hashtable legacy methods
2056	+
2057		/**
2058	<	* Removes the key (and its corresponding value) from this map.
2059	<	* This method does nothing if the key is not in the map.
2058	>	* Legacy method testing if some key maps into the specified value
2059	>	* in this table.  This method is identical in functionality to
2060	>	* {@link #containsValue(Object)}, and exists solely to ensure
2061	>	* full compatibility with class {@link java.util.Hashtable},
2062	>	* which supported this method prior to introduction of the
2063	>	* Java Collections framework.
2064		*
2065	<	* @param  key the key that needs to be removed
2066	<	* @return the previous value associated with {@code key}, or
2067	<	*         {@code null} if there was no mapping for {@code key}
2068	<	* @throws NullPointerException if the specified key is null
2065	>	* @param  value a value to search for
2066	>	* @return {@code true} if and only if some key maps to the
2067	>	*         {@code value} argument in this table as
2068	>	*         determined by the {@code equals} method;
2069	>	*         {@code false} otherwise
2070	>	* @throws NullPointerException if the specified value is null
2071		*/
2072	<	@SuppressWarnings("unchecked") public V remove(Object key) {
2073	<	if (key == null)
2995	<	throw new NullPointerException();
2996	<	return (V)internalReplace(key, null, null);
2072	>	@Deprecated public boolean contains(Object value) {
2073	>	return containsValue(value);
2074		}
2075
2076		/**
2077	<	* {@inheritDoc}
2077	>	* Returns an enumeration of the keys in this table.
2078		*
2079	<	* @throws NullPointerException if the specified key is null
2079	>	* @return an enumeration of the keys in this table
2080	>	* @see #keySet()
2081		*/
2082	<	public boolean remove(Object key, Object value) {
2083	<	if (key == null)
2084	<	throw new NullPointerException();
2085	<	if (value == null)
3008	<	return false;
3009	<	return internalReplace(key, null, value) != null;
2082	>	public Enumeration<K> keys() {
2083	>	Node<K,V>[] t;
2084	>	int f = (t = table) == null ? 0 : t.length;
2085	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2086		}
2087
2088		/**
2089	<	* {@inheritDoc}
2089	>	* Returns an enumeration of the values in this table.
2090		*
2091	<	* @throws NullPointerException if any of the arguments are null
2091	>	* @return an enumeration of the values in this table
2092	>	* @see #values()
2093		*/
2094	<	public boolean replace(K key, V oldValue, V newValue) {
2095	<	if (key == null || oldValue == null || newValue == null)
2096	<	throw new NullPointerException();
2097	<	return internalReplace(key, newValue, oldValue) != null;
2094	>	public Enumeration<V> elements() {
2095	>	Node<K,V>[] t;
2096	>	int f = (t = table) == null ? 0 : t.length;
2097	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2098		}
2099
2100	+	// ConcurrentHashMapV8-only methods
2101	+
2102		/**
2103	<	* {@inheritDoc}
2103	>	* Returns the number of mappings. This method should be used
2104	>	* instead of {@link #size} because a ConcurrentHashMapV8 may
2105	>	* contain more mappings than can be represented as an int. The
2106	>	* value returned is an estimate; the actual count may differ if
2107	>	* there are concurrent insertions or removals.
2108		*
2109	<	* @return the previous value associated with the specified key,
2110	<	*         or {@code null} if there was no mapping for the key
3028	<	* @throws NullPointerException if the specified key or value is null
2109	>	* @return the number of mappings
2110	>	* @since 1.8
2111		*/
2112	<	@SuppressWarnings("unchecked") public V replace(K key, V value) {
2113	<	if (key == null || value == null)
2114	<	throw new NullPointerException();
3033	<	return (V)internalReplace(key, value, null);
2112	>	public long mappingCount() {
2113	>	long n = sumCount();
2114	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2115		}
2116
2117		/**
2118	<	* Removes all of the mappings from this map.
2118	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2119	>	* from the given type to {@code Boolean.TRUE}.
2120	>	*
2121	>	* @return the new set
2122	>	* @since 1.8
2123		*/
2124	<	public void clear() {
2125	<	internalClear();
2124	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2125	>	return new KeySetView<K,Boolean>
2126	>	(new ConcurrentHashMapV8<K,Boolean>(), Boolean.TRUE);
2127		}
2128
2129		/**
2130	<	* Returns a {@link Set} view of the keys contained in this map.
2131	<	* The set is backed by the map, so changes to the map are
3046	<	* reflected in the set, and vice-versa.
2130	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2131	>	* from the given type to {@code Boolean.TRUE}.
2132		*
2133	<	* @return the set view
2133	>	* @param initialCapacity The implementation performs internal
2134	>	* sizing to accommodate this many elements.
2135	>	* @return the new set
2136	>	* @throws IllegalArgumentException if the initial capacity of
2137	>	* elements is negative
2138	>	* @since 1.8
2139		*/
2140	<	public KeySetView<K,V> keySet() {
2141	<	KeySetView<K,V> ks = keySet;
2142	<	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2140	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2141	>	return new KeySetView<K,Boolean>
2142	>	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2143		}
2144
2145		/**
2146		* Returns a {@link Set} view of the keys in this map, using the
2147		* given common mapped value for any additions (i.e., {@link
2148	<	* Collection#add} and {@link Collection#addAll}). This is of
2149	<	* course only appropriate if it is acceptable to use the same
2150	<	* value for all additions from this view.
2148	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2149	>	* This is of course only appropriate if it is acceptable to use
2150	>	* the same value for all additions from this view.
2151		*
2152	<	* @param mappedValue the mapped value to use for any
3063	<	* additions.
2152	>	* @param mappedValue the mapped value to use for any additions
2153		* @return the set view
2154		* @throws NullPointerException if the mappedValue is null
2155		*/
#	Line 3070 | Line 2159 | public class ConcurrentHashMapV8<K, V>
2159		return new KeySetView<K,V>(this, mappedValue);
2160		}
2161
2162	+	/* ---------------- Special Nodes -------------- */
2163	+
2164		/**
2165	<	* 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.
2165	>	* A node inserted at head of bins during transfer operations.
2166		*/
2167	<	public ValuesView<K,V> values() {
2168	<	ValuesView<K,V> vs = values;
2169	<	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
2167	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2168	>	final Node<K,V>[] nextTable;
2169	>	ForwardingNode(Node<K,V>[] tab) {
2170	>	super(MOVED, null, null, null);
2171	>	this.nextTable = tab;
2172	>	}
2173	>
2174	>	Node<K,V> find(int h, Object k) {
2175	>	// loop to avoid arbitrarily deep recursion on forwarding nodes
2176	>	outer: for (Node<K,V>[] tab = nextTable;;) {
2177	>	Node<K,V> e; int n;
2178	>	if (k == null || tab == null || (n = tab.length) == 0 ||
2179	>	(e = tabAt(tab, (n - 1) & h)) == null)
2180	>	return null;
2181	>	for (;;) {
2182	>	int eh; K ek;
2183	>	if ((eh = e.hash) == h &&
2184	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2185	>	return e;
2186	>	if (eh < 0) {
2187	>	if (e instanceof ForwardingNode) {
2188	>	tab = ((ForwardingNode<K,V>)e).nextTable;
2189	>	continue outer;
2190	>	}
2191	>	else
2192	>	return e.find(h, k);
2193	>	}
2194	>	if ((e = e.next) == null)
2195	>	return null;
2196	>	}
2197	>	}
2198	>	}
2199		}
2200
2201		/**
2202	<	* 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.
2202	>	* A place-holder node used in computeIfAbsent and compute
2203		*/
2204	<	public Set<Map.Entry<K,V>> entrySet() {
2205	<	EntrySetView<K,V> es = entrySet;
2206	<	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
2204	>	static final class ReservationNode<K,V> extends Node<K,V> {
2205	>	ReservationNode() {
2206	>	super(RESERVED, null, null, null);
2207	>	}
2208	>
2209	>	Node<K,V> find(int h, Object k) {
2210	>	return null;
2211	>	}
2212		}
2213
2214	+	/* ---------------- Table Initialization and Resizing -------------- */
2215	+
2216		/**
2217	<	* Returns an enumeration of the keys in this table.
2218	<	*
3107	<	* @return an enumeration of the keys in this table
3108	<	* @see #keySet()
2217	>	* Returns the stamp bits for resizing a table of size n.
2218	>	* Must be negative when shifted left by RESIZE_STAMP_SHIFT.
2219		*/
2220	<	public Enumeration<K> keys() {
2221	<	return new KeyIterator<K,V>(this);
2220	>	static final int resizeStamp(int n) {
2221	>	return Integer.numberOfLeadingZeros(n) | (1 << (RESIZE_STAMP_BITS - 1));
2222		}
2223
2224		/**
2225	<	* Returns an enumeration of the values in this table.
3116	<	*
3117	<	* @return an enumeration of the values in this table
3118	<	* @see #values()
2225	>	* Initializes table, using the size recorded in sizeCtl.
2226		*/
2227	<	public Enumeration<V> elements() {
2228	<	return new ValueIterator<K,V>(this);
2227	>	private final Node<K,V>[] initTable() {
2228	>	Node<K,V>[] tab; int sc;
2229	>	while ((tab = table) == null || tab.length == 0) {
2230	>	if ((sc = sizeCtl) < 0)
2231	>	Thread.yield(); // lost initialization race; just spin
2232	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2233	>	try {
2234	>	if ((tab = table) == null || tab.length == 0) {
2235	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2236	>	@SuppressWarnings("unchecked")
2237	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2238	>	table = tab = nt;
2239	>	sc = n - (n >>> 2);
2240	>	}
2241	>	} finally {
2242	>	sizeCtl = sc;
2243	>	}
2244	>	break;
2245	>	}
2246	>	}
2247	>	return tab;
2248		}
2249
2250		/**
2251	<	* Returns a partitionable iterator of the keys in this map.
2252	<	*
2253	<	* @return a partitionable iterator of the keys in this map
2251	>	* Adds to count, and if table is too small and not already
2252	>	* resizing, initiates transfer. If already resizing, helps
2253	>	* perform transfer if work is available.  Rechecks occupancy
2254	>	* after a transfer to see if another resize is already needed
2255	>	* because resizings are lagging additions.
2256	>	*
2257	>	* @param x the count to add
2258	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
2259	>	*/
2260	>	private final void addCount(long x, int check) {
2261	>	CounterCell[] as; long b, s;
2262	>	if ((as = counterCells) != null ||
2263	>	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2264	>	CounterHashCode hc; CounterCell a; long v; int m;
2265	>	boolean uncontended = true;
2266	>	if ((hc = threadCounterHashCode.get()) == null ||
2267	>	as == null || (m = as.length - 1) < 0 ||
2268	>	(a = as[m & hc.code]) == null ||
2269	>	!(uncontended =
2270	>	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
2271	>	fullAddCount(x, hc, uncontended);
2272	>	return;
2273	>	}
2274	>	if (check <= 1)
2275	>	return;
2276	>	s = sumCount();
2277	>	}
2278	>	if (check >= 0) {
2279	>	Node<K,V>[] tab, nt; int n, sc;
2280	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2281	>	(n = tab.length) < MAXIMUM_CAPACITY) {
2282	>	int rs = resizeStamp(n);
2283	>	if (sc < 0) {
2284	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2285	>	sc == rs + MAX_RESIZERS || (nt = nextTable) == null ||
2286	>	transferIndex <= 0)
2287	>	break;
2288	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1))
2289	>	transfer(tab, nt);
2290	>	}
2291	>	else if (U.compareAndSwapInt(this, SIZECTL, sc,
2292	>	(rs << RESIZE_STAMP_SHIFT) + 2))
2293	>	transfer(tab, null);
2294	>	s = sumCount();
2295	>	}
2296	>	}
2297	>	}
2298	>
2299	>	/**
2300	>	* Helps transfer if a resize is in progress.
2301		*/
2302	<	public Spliterator<K> keySpliterator() {
2303	<	return new KeyIterator<K,V>(this);
2302	>	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2303	>	Node<K,V>[] nextTab; int sc;
2304	>	if (tab != null && (f instanceof ForwardingNode) &&
2305	>	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2306	>	int rs = resizeStamp(tab.length);
2307	>	while (nextTab == nextTable && table == tab &&
2308	>	(sc = sizeCtl) < 0) {
2309	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2310	>	sc == rs + MAX_RESIZERS || transferIndex <= 0)
2311	>	break;
2312	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1)) {
2313	>	transfer(tab, nextTab);
2314	>	break;
2315	>	}
2316	>	}
2317	>	return nextTab;
2318	>	}
2319	>	return table;
2320		}
2321
2322		/**
2323	<	* Returns a partitionable iterator of the values in this map.
2323	>	* Tries to presize table to accommodate the given number of elements.
2324		*
2325	<	* @return a partitionable iterator of the values in this map
2325	>	* @param size number of elements (doesn't need to be perfectly accurate)
2326		*/
2327	<	public Spliterator<V> valueSpliterator() {
2328	<	return new ValueIterator<K,V>(this);
2327	>	private final void tryPresize(int size) {
2328	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2329	>	tableSizeFor(size + (size >>> 1) + 1);
2330	>	int sc;
2331	>	while ((sc = sizeCtl) >= 0) {
2332	>	Node<K,V>[] tab = table; int n;
2333	>	if (tab == null || (n = tab.length) == 0) {
2334	>	n = (sc > c) ? sc : c;
2335	>	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2336	>	try {
2337	>	if (table == tab) {
2338	>	@SuppressWarnings("unchecked")
2339	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2340	>	table = nt;
2341	>	sc = n - (n >>> 2);
2342	>	}
2343	>	} finally {
2344	>	sizeCtl = sc;
2345	>	}
2346	>	}
2347	>	}
2348	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2349	>	break;
2350	>	else if (tab == table) {
2351	>	int rs = resizeStamp(n);
2352	>	if (sc < 0) {
2353	>	Node<K,V>[] nt;
2354	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2355	>	sc == rs + MAX_RESIZERS || (nt = nextTable) == null ||
2356	>	transferIndex <= 0)
2357	>	break;
2358	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1))
2359	>	transfer(tab, nt);
2360	>	}
2361	>	else if (U.compareAndSwapInt(this, SIZECTL, sc,
2362	>	(rs << RESIZE_STAMP_SHIFT) + 2))
2363	>	transfer(tab, null);
2364	>	}
2365	>	}
2366		}
2367
2368		/**
2369	<	* Returns a partitionable iterator of the entries in this map.
2370	<	*
2371	<	* @return a partitionable iterator of the entries in this map
2369	>	* Moves and/or copies the nodes in each bin to new table. See
2370	>	* above for explanation.
2371	>	*/
2372	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2373	>	int n = tab.length, stride;
2374	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2375	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
2376	>	if (nextTab == null) {            // initiating
2377	>	try {
2378	>	@SuppressWarnings("unchecked")
2379	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n << 1];
2380	>	nextTab = nt;
2381	>	} catch (Throwable ex) {      // try to cope with OOME
2382	>	sizeCtl = Integer.MAX_VALUE;
2383	>	return;
2384	>	}
2385	>	nextTable = nextTab;
2386	>	transferIndex = n;
2387	>	}
2388	>	int nextn = nextTab.length;
2389	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2390	>	boolean advance = true;
2391	>	boolean finishing = false; // to ensure sweep before committing nextTab
2392	>	for (int i = 0, bound = 0;;) {
2393	>	Node<K,V> f; int fh;
2394	>	while (advance) {
2395	>	int nextIndex, nextBound;
2396	>	if (--i >= bound || finishing)
2397	>	advance = false;
2398	>	else if ((nextIndex = transferIndex) <= 0) {
2399	>	i = -1;
2400	>	advance = false;
2401	>	}
2402	>	else if (U.compareAndSwapInt
2403	>	(this, TRANSFERINDEX, nextIndex,
2404	>	nextBound = (nextIndex > stride ?
2405	>	nextIndex - stride : 0))) {
2406	>	bound = nextBound;
2407	>	i = nextIndex - 1;
2408	>	advance = false;
2409	>	}
2410	>	}
2411	>	if (i < 0 || i >= n || i + n >= nextn) {
2412	>	int sc;
2413	>	if (finishing) {
2414	>	nextTable = null;
2415	>	table = nextTab;
2416	>	sizeCtl = (n << 1) - (n >>> 1);
2417	>	return;
2418	>	}
2419	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, sc - 1)) {
2420	>	if ((sc - 2) != resizeStamp(n) << RESIZE_STAMP_SHIFT)
2421	>	return;
2422	>	finishing = advance = true;
2423	>	i = n; // recheck before commit
2424	>	}
2425	>	}
2426	>	else if ((f = tabAt(tab, i)) == null)
2427	>	advance = casTabAt(tab, i, null, fwd);
2428	>	else if ((fh = f.hash) == MOVED)
2429	>	advance = true; // already processed
2430	>	else {
2431	>	synchronized (f) {
2432	>	if (tabAt(tab, i) == f) {
2433	>	Node<K,V> ln, hn;
2434	>	if (fh >= 0) {
2435	>	int runBit = fh & n;
2436	>	Node<K,V> lastRun = f;
2437	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2438	>	int b = p.hash & n;
2439	>	if (b != runBit) {
2440	>	runBit = b;
2441	>	lastRun = p;
2442	>	}
2443	>	}
2444	>	if (runBit == 0) {
2445	>	ln = lastRun;
2446	>	hn = null;
2447	>	}
2448	>	else {
2449	>	hn = lastRun;
2450	>	ln = null;
2451	>	}
2452	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2453	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2454	>	if ((ph & n) == 0)
2455	>	ln = new Node<K,V>(ph, pk, pv, ln);
2456	>	else
2457	>	hn = new Node<K,V>(ph, pk, pv, hn);
2458	>	}
2459	>	setTabAt(nextTab, i, ln);
2460	>	setTabAt(nextTab, i + n, hn);
2461	>	setTabAt(tab, i, fwd);
2462	>	advance = true;
2463	>	}
2464	>	else if (f instanceof TreeBin) {
2465	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2466	>	TreeNode<K,V> lo = null, loTail = null;
2467	>	TreeNode<K,V> hi = null, hiTail = null;
2468	>	int lc = 0, hc = 0;
2469	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2470	>	int h = e.hash;
2471	>	TreeNode<K,V> p = new TreeNode<K,V>
2472	>	(h, e.key, e.val, null, null);
2473	>	if ((h & n) == 0) {
2474	>	if ((p.prev = loTail) == null)
2475	>	lo = p;
2476	>	else
2477	>	loTail.next = p;
2478	>	loTail = p;
2479	>	++lc;
2480	>	}
2481	>	else {
2482	>	if ((p.prev = hiTail) == null)
2483	>	hi = p;
2484	>	else
2485	>	hiTail.next = p;
2486	>	hiTail = p;
2487	>	++hc;
2488	>	}
2489	>	}
2490	>	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2491	>	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2492	>	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2493	>	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2494	>	setTabAt(nextTab, i, ln);
2495	>	setTabAt(nextTab, i + n, hn);
2496	>	setTabAt(tab, i, fwd);
2497	>	advance = true;
2498	>	}
2499	>	}
2500	>	}
2501	>	}
2502	>	}
2503	>	}
2504	>
2505	>	/* ---------------- Conversion from/to TreeBins -------------- */
2506	>
2507	>	/**
2508	>	* Replaces all linked nodes in bin at given index unless table is
2509	>	* too small, in which case resizes instead.
2510		*/
2511	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2512	<	return new EntryIterator<K,V>(this);
2511	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2512	>	Node<K,V> b; int n, sc;
2513	>	if (tab != null) {
2514	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY)
2515	>	tryPresize(n << 1);
2516	>	else if ((b = tabAt(tab, index)) != null && b.hash >= 0) {
2517	>	synchronized (b) {
2518	>	if (tabAt(tab, index) == b) {
2519	>	TreeNode<K,V> hd = null, tl = null;
2520	>	for (Node<K,V> e = b; e != null; e = e.next) {
2521	>	TreeNode<K,V> p =
2522	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2523	>	null, null);
2524	>	if ((p.prev = tl) == null)
2525	>	hd = p;
2526	>	else
2527	>	tl.next = p;
2528	>	tl = p;
2529	>	}
2530	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2531	>	}
2532	>	}
2533	>	}
2534	>	}
2535		}
2536
2537		/**
2538	<	* 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
2538	>	* Returns a list on non-TreeNodes replacing those in given list.
2539		*/
2540	<	public int hashCode() {
2541	<	int h = 0;
2542	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2543	<	Object v;
2544	<	while ((v = it.advance()) != null) {
2545	<	h += it.nextKey.hashCode() ^ v.hashCode();
2540	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2541	>	Node<K,V> hd = null, tl = null;
2542	>	for (Node<K,V> q = b; q != null; q = q.next) {
2543	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2544	>	if (tl == null)
2545	>	hd = p;
2546	>	else
2547	>	tl.next = p;
2548	>	tl = p;
2549		}
2550	<	return h;
2550	>	return hd;
2551		}
2552
2553	+	/* ---------------- TreeNodes -------------- */
2554	+
2555		/**
2556	<	* 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
2556	>	* Nodes for use in TreeBins
2557		*/
2558	<	public String toString() {
2559	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2560	<	StringBuilder sb = new StringBuilder();
2561	<	sb.append('{');
2562	<	Object v;
2563	<	if ((v = it.advance()) != null) {
2564	<	for (;;) {
2565	<	Object k = it.nextKey;
2566	<	sb.append(k == this ? "(this Map)" : k);
2567	<	sb.append('=');
2568	<	sb.append(v == this ? "(this Map)" : v);
2569	<	if ((v = it.advance()) == null)
2558	>	static final class TreeNode<K,V> extends Node<K,V> {
2559	>	TreeNode<K,V> parent;  // red-black tree links
2560	>	TreeNode<K,V> left;
2561	>	TreeNode<K,V> right;
2562	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2563	>	boolean red;
2564	>
2565	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2566	>	TreeNode<K,V> parent) {
2567	>	super(hash, key, val, next);
2568	>	this.parent = parent;
2569	>	}
2570	>
2571	>	Node<K,V> find(int h, Object k) {
2572	>	return findTreeNode(h, k, null);
2573	>	}
2574	>
2575	>	/**
2576	>	* Returns the TreeNode (or null if not found) for the given key
2577	>	* starting at given root.
2578	>	*/
2579	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2580	>	if (k != null) {
2581	>	TreeNode<K,V> p = this;
2582	>	do  {
2583	>	int ph, dir; K pk; TreeNode<K,V> q;
2584	>	TreeNode<K,V> pl = p.left, pr = p.right;
2585	>	if ((ph = p.hash) > h)
2586	>	p = pl;
2587	>	else if (ph < h)
2588	>	p = pr;
2589	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2590	>	return p;
2591	>	else if (pl == null)
2592	>	p = pr;
2593	>	else if (pr == null)
2594	>	p = pl;
2595	>	else if ((kc != null ||
2596	>	(kc = comparableClassFor(k)) != null) &&
2597	>	(dir = compareComparables(kc, k, pk)) != 0)
2598	>	p = (dir < 0) ? pl : pr;
2599	>	else if ((q = pr.findTreeNode(h, k, kc)) != null)
2600	>	return q;
2601	>	else
2602	>	p = pl;
2603	>	} while (p != null);
2604	>	}
2605	>	return null;
2606	>	}
2607	>	}
2608	>
2609	>	/* ---------------- TreeBins -------------- */
2610	>
2611	>	/**
2612	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2613	>	* keys or values, but instead point to list of TreeNodes and
2614	>	* their root. They also maintain a parasitic read-write lock
2615	>	* forcing writers (who hold bin lock) to wait for readers (who do
2616	>	* not) to complete before tree restructuring operations.
2617	>	*/
2618	>	static final class TreeBin<K,V> extends Node<K,V> {
2619	>	TreeNode<K,V> root;
2620	>	volatile TreeNode<K,V> first;
2621	>	volatile Thread waiter;
2622	>	volatile int lockState;
2623	>	// values for lockState
2624	>	static final int WRITER = 1; // set while holding write lock
2625	>	static final int WAITER = 2; // set when waiting for write lock
2626	>	static final int READER = 4; // increment value for setting read lock
2627	>
2628	>	/**
2629	>	* Tie-breaking utility for ordering insertions when equal
2630	>	* hashCodes and non-comparable. We don't require a total
2631	>	* order, just a consistent insertion rule to maintain
2632	>	* equivalence across rebalancings. Tie-breaking further than
2633	>	* necessary simplifies testing a bit.
2634	>	*/
2635	>	static int tieBreakOrder(Object a, Object b) {
2636	>	int d;
2637	>	if (a == null || b == null ||
2638	>	(d = a.getClass().getName().
2639	>	compareTo(b.getClass().getName())) == 0)
2640	>	d = (System.identityHashCode(a) <= System.identityHashCode(b) ?
2641	>	-1 : 1);
2642	>	return d;
2643	>	}
2644	>
2645	>	/**
2646	>	* Creates bin with initial set of nodes headed by b.
2647	>	*/
2648	>	TreeBin(TreeNode<K,V> b) {
2649	>	super(TREEBIN, null, null, null);
2650	>	this.first = b;
2651	>	TreeNode<K,V> r = null;
2652	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2653	>	next = (TreeNode<K,V>)x.next;
2654	>	x.left = x.right = null;
2655	>	if (r == null) {
2656	>	x.parent = null;
2657	>	x.red = false;
2658	>	r = x;
2659	>	}
2660	>	else {
2661	>	K k = x.key;
2662	>	int h = x.hash;
2663	>	Class<?> kc = null;
2664	>	for (TreeNode<K,V> p = r;;) {
2665	>	int dir, ph;
2666	>	K pk = p.key;
2667	>	if ((ph = p.hash) > h)
2668	>	dir = -1;
2669	>	else if (ph < h)
2670	>	dir = 1;
2671	>	else if ((kc == null &&
2672	>	(kc = comparableClassFor(k)) == null) ||
2673	>	(dir = compareComparables(kc, k, pk)) == 0)
2674	>	dir = tieBreakOrder(k, pk);
2675	>	TreeNode<K,V> xp = p;
2676	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2677	>	x.parent = xp;
2678	>	if (dir <= 0)
2679	>	xp.left = x;
2680	>	else
2681	>	xp.right = x;
2682	>	r = balanceInsertion(r, x);
2683	>	break;
2684	>	}
2685	>	}
2686	>	}
2687	>	}
2688	>	this.root = r;
2689	>	assert checkInvariants(root);
2690	>	}
2691	>
2692	>	/**
2693	>	* Acquires write lock for tree restructuring.
2694	>	*/
2695	>	private final void lockRoot() {
2696	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2697	>	contendedLock(); // offload to separate method
2698	>	}
2699	>
2700	>	/**
2701	>	* Releases write lock for tree restructuring.
2702	>	*/
2703	>	private final void unlockRoot() {
2704	>	lockState = 0;
2705	>	}
2706	>
2707	>	/**
2708	>	* Possibly blocks awaiting root lock.
2709	>	*/
2710	>	private final void contendedLock() {
2711	>	boolean waiting = false;
2712	>	for (int s;;) {
2713	>	if (((s = lockState) & ~WAITER) == 0) {
2714	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2715	>	if (waiting)
2716	>	waiter = null;
2717	>	return;
2718	>	}
2719	>	}
2720	>	else if ((s & WAITER) == 0) {
2721	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2722	>	waiting = true;
2723	>	waiter = Thread.currentThread();
2724	>	}
2725	>	}
2726	>	else if (waiting)
2727	>	LockSupport.park(this);
2728	>	}
2729	>	}
2730	>
2731	>	/**
2732	>	* Returns matching node or null if none. Tries to search
2733	>	* using tree comparisons from root, but continues linear
2734	>	* search when lock not available.
2735	>	*/
2736	>	final Node<K,V> find(int h, Object k) {
2737	>	if (k != null) {
2738	>	for (Node<K,V> e = first; e != null; ) {
2739	>	int s; K ek;
2740	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2741	>	if (e.hash == h &&
2742	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2743	>	return e;
2744	>	e = e.next;
2745	>	}
2746	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2747	>	s + READER)) {
2748	>	TreeNode<K,V> r, p;
2749	>	try {
2750	>	p = ((r = root) == null ? null :
2751	>	r.findTreeNode(h, k, null));
2752	>	} finally {
2753	>	Thread w;
2754	>	int ls;
2755	>	do {} while (!U.compareAndSwapInt
2756	>	(this, LOCKSTATE,
2757	>	ls = lockState, ls - READER));
2758	>	if (ls == (READER|WAITER) && (w = waiter) != null)
2759	>	LockSupport.unpark(w);
2760	>	}
2761	>	return p;
2762	>	}
2763	>	}
2764	>	}
2765	>	return null;
2766	>	}
2767	>
2768	>	/**
2769	>	* Finds or adds a node.
2770	>	* @return null if added
2771	>	*/
2772	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2773	>	Class<?> kc = null;
2774	>	boolean searched = false;
2775	>	for (TreeNode<K,V> p = root;;) {
2776	>	int dir, ph; K pk;
2777	>	if (p == null) {
2778	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2779		break;
2780	<	sb.append(',').append(' ');
2780	>	}
2781	>	else if ((ph = p.hash) > h)
2782	>	dir = -1;
2783	>	else if (ph < h)
2784	>	dir = 1;
2785	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2786	>	return p;
2787	>	else if ((kc == null &&
2788	>	(kc = comparableClassFor(k)) == null) ||
2789	>	(dir = compareComparables(kc, k, pk)) == 0) {
2790	>	if (!searched) {
2791	>	TreeNode<K,V> q, ch;
2792	>	searched = true;
2793	>	if (((ch = p.left) != null &&
2794	>	(q = ch.findTreeNode(h, k, kc)) != null) ||
2795	>	((ch = p.right) != null &&
2796	>	(q = ch.findTreeNode(h, k, kc)) != null))
2797	>	return q;
2798	>	}
2799	>	dir = tieBreakOrder(k, pk);
2800	>	}
2801	>
2802	>	TreeNode<K,V> xp = p;
2803	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2804	>	TreeNode<K,V> x, f = first;
2805	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2806	>	if (f != null)
2807	>	f.prev = x;
2808	>	if (dir <= 0)
2809	>	xp.left = x;
2810	>	else
2811	>	xp.right = x;
2812	>	if (!xp.red)
2813	>	x.red = true;
2814	>	else {
2815	>	lockRoot();
2816	>	try {
2817	>	root = balanceInsertion(root, x);
2818	>	} finally {
2819	>	unlockRoot();
2820	>	}
2821	>	}
2822	>	break;
2823	>	}
2824	>	}
2825	>	assert checkInvariants(root);
2826	>	return null;
2827	>	}
2828	>
2829	>	/**
2830	>	* Removes the given node, that must be present before this
2831	>	* call.  This is messier than typical red-black deletion code
2832	>	* because we cannot swap the contents of an interior node
2833	>	* with a leaf successor that is pinned by "next" pointers
2834	>	* that are accessible independently of lock. So instead we
2835	>	* swap the tree linkages.
2836	>	*
2837	>	* @return true if now too small, so should be untreeified
2838	>	*/
2839	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2840	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2841	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2842	>	TreeNode<K,V> r, rl;
2843	>	if (pred == null)
2844	>	first = next;
2845	>	else
2846	>	pred.next = next;
2847	>	if (next != null)
2848	>	next.prev = pred;
2849	>	if (first == null) {
2850	>	root = null;
2851	>	return true;
2852	>	}
2853	>	if ((r = root) == null || r.right == null || // too small
2854	>	(rl = r.left) == null || rl.left == null)
2855	>	return true;
2856	>	lockRoot();
2857	>	try {
2858	>	TreeNode<K,V> replacement;
2859	>	TreeNode<K,V> pl = p.left;
2860	>	TreeNode<K,V> pr = p.right;
2861	>	if (pl != null && pr != null) {
2862	>	TreeNode<K,V> s = pr, sl;
2863	>	while ((sl = s.left) != null) // find successor
2864	>	s = sl;
2865	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2866	>	TreeNode<K,V> sr = s.right;
2867	>	TreeNode<K,V> pp = p.parent;
2868	>	if (s == pr) { // p was s's direct parent
2869	>	p.parent = s;
2870	>	s.right = p;
2871	>	}
2872	>	else {
2873	>	TreeNode<K,V> sp = s.parent;
2874	>	if ((p.parent = sp) != null) {
2875	>	if (s == sp.left)
2876	>	sp.left = p;
2877	>	else
2878	>	sp.right = p;
2879	>	}
2880	>	if ((s.right = pr) != null)
2881	>	pr.parent = s;
2882	>	}
2883	>	p.left = null;
2884	>	if ((p.right = sr) != null)
2885	>	sr.parent = p;
2886	>	if ((s.left = pl) != null)
2887	>	pl.parent = s;
2888	>	if ((s.parent = pp) == null)
2889	>	r = s;
2890	>	else if (p == pp.left)
2891	>	pp.left = s;
2892	>	else
2893	>	pp.right = s;
2894	>	if (sr != null)
2895	>	replacement = sr;
2896	>	else
2897	>	replacement = p;
2898	>	}
2899	>	else if (pl != null)
2900	>	replacement = pl;
2901	>	else if (pr != null)
2902	>	replacement = pr;
2903	>	else
2904	>	replacement = p;
2905	>	if (replacement != p) {
2906	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2907	>	if (pp == null)
2908	>	r = replacement;
2909	>	else if (p == pp.left)
2910	>	pp.left = replacement;
2911	>	else
2912	>	pp.right = replacement;
2913	>	p.left = p.right = p.parent = null;
2914	>	}
2915	>
2916	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2917	>
2918	>	if (p == replacement) {  // detach pointers
2919	>	TreeNode<K,V> pp;
2920	>	if ((pp = p.parent) != null) {
2921	>	if (p == pp.left)
2922	>	pp.left = null;
2923	>	else if (p == pp.right)
2924	>	pp.right = null;
2925	>	p.parent = null;
2926	>	}
2927	>	}
2928	>	} finally {
2929	>	unlockRoot();
2930	>	}
2931	>	assert checkInvariants(root);
2932	>	return false;
2933	>	}
2934	>
2935	>	/* ------------------------------------------------------------ */
2936	>	// Red-black tree methods, all adapted from CLR
2937	>
2938	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2939	>	TreeNode<K,V> p) {
2940	>	TreeNode<K,V> r, pp, rl;
2941	>	if (p != null && (r = p.right) != null) {
2942	>	if ((rl = p.right = r.left) != null)
2943	>	rl.parent = p;
2944	>	if ((pp = r.parent = p.parent) == null)
2945	>	(root = r).red = false;
2946	>	else if (pp.left == p)
2947	>	pp.left = r;
2948	>	else
2949	>	pp.right = r;
2950	>	r.left = p;
2951	>	p.parent = r;
2952	>	}
2953	>	return root;
2954	>	}
2955	>
2956	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2957	>	TreeNode<K,V> p) {
2958	>	TreeNode<K,V> l, pp, lr;
2959	>	if (p != null && (l = p.left) != null) {
2960	>	if ((lr = p.left = l.right) != null)
2961	>	lr.parent = p;
2962	>	if ((pp = l.parent = p.parent) == null)
2963	>	(root = l).red = false;
2964	>	else if (pp.right == p)
2965	>	pp.right = l;
2966	>	else
2967	>	pp.left = l;
2968	>	l.right = p;
2969	>	p.parent = l;
2970	>	}
2971	>	return root;
2972	>	}
2973	>
2974	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2975	>	TreeNode<K,V> x) {
2976	>	x.red = true;
2977	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2978	>	if ((xp = x.parent) == null) {
2979	>	x.red = false;
2980	>	return x;
2981	>	}
2982	>	else if (!xp.red || (xpp = xp.parent) == null)
2983	>	return root;
2984	>	if (xp == (xppl = xpp.left)) {
2985	>	if ((xppr = xpp.right) != null && xppr.red) {
2986	>	xppr.red = false;
2987	>	xp.red = false;
2988	>	xpp.red = true;
2989	>	x = xpp;
2990	>	}
2991	>	else {
2992	>	if (x == xp.right) {
2993	>	root = rotateLeft(root, x = xp);
2994	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2995	>	}
2996	>	if (xp != null) {
2997	>	xp.red = false;
2998	>	if (xpp != null) {
2999	>	xpp.red = true;
3000	>	root = rotateRight(root, xpp);
3001	>	}
3002	>	}
3003	>	}
3004	>	}
3005	>	else {
3006	>	if (xppl != null && xppl.red) {
3007	>	xppl.red = false;
3008	>	xp.red = false;
3009	>	xpp.red = true;
3010	>	x = xpp;
3011	>	}
3012	>	else {
3013	>	if (x == xp.left) {
3014	>	root = rotateRight(root, x = xp);
3015	>	xpp = (xp = x.parent) == null ? null : xp.parent;
3016	>	}
3017	>	if (xp != null) {
3018	>	xp.red = false;
3019	>	if (xpp != null) {
3020	>	xpp.red = true;
3021	>	root = rotateLeft(root, xpp);
3022	>	}
3023	>	}
3024	>	}
3025	>	}
3026	>	}
3027	>	}
3028	>
3029	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
3030	>	TreeNode<K,V> x) {
3031	>	for (TreeNode<K,V> xp, xpl, xpr;;)  {
3032	>	if (x == null || x == root)
3033	>	return root;
3034	>	else if ((xp = x.parent) == null) {
3035	>	x.red = false;
3036	>	return x;
3037	>	}
3038	>	else if (x.red) {
3039	>	x.red = false;
3040	>	return root;
3041	>	}
3042	>	else if ((xpl = xp.left) == x) {
3043	>	if ((xpr = xp.right) != null && xpr.red) {
3044	>	xpr.red = false;
3045	>	xp.red = true;
3046	>	root = rotateLeft(root, xp);
3047	>	xpr = (xp = x.parent) == null ? null : xp.right;
3048	>	}
3049	>	if (xpr == null)
3050	>	x = xp;
3051	>	else {
3052	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
3053	>	if ((sr == null || !sr.red) &&
3054	>	(sl == null || !sl.red)) {
3055	>	xpr.red = true;
3056	>	x = xp;
3057	>	}
3058	>	else {
3059	>	if (sr == null || !sr.red) {
3060	>	if (sl != null)
3061	>	sl.red = false;
3062	>	xpr.red = true;
3063	>	root = rotateRight(root, xpr);
3064	>	xpr = (xp = x.parent) == null ?
3065	>	null : xp.right;
3066	>	}
3067	>	if (xpr != null) {
3068	>	xpr.red = (xp == null) ? false : xp.red;
3069	>	if ((sr = xpr.right) != null)
3070	>	sr.red = false;
3071	>	}
3072	>	if (xp != null) {
3073	>	xp.red = false;
3074	>	root = rotateLeft(root, xp);
3075	>	}
3076	>	x = root;
3077	>	}
3078	>	}
3079	>	}
3080	>	else { // symmetric
3081	>	if (xpl != null && xpl.red) {
3082	>	xpl.red = false;
3083	>	xp.red = true;
3084	>	root = rotateRight(root, xp);
3085	>	xpl = (xp = x.parent) == null ? null : xp.left;
3086	>	}
3087	>	if (xpl == null)
3088	>	x = xp;
3089	>	else {
3090	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3091	>	if ((sl == null || !sl.red) &&
3092	>	(sr == null || !sr.red)) {
3093	>	xpl.red = true;
3094	>	x = xp;
3095	>	}
3096	>	else {
3097	>	if (sl == null || !sl.red) {
3098	>	if (sr != null)
3099	>	sr.red = false;
3100	>	xpl.red = true;
3101	>	root = rotateLeft(root, xpl);
3102	>	xpl = (xp = x.parent) == null ?
3103	>	null : xp.left;
3104	>	}
3105	>	if (xpl != null) {
3106	>	xpl.red = (xp == null) ? false : xp.red;
3107	>	if ((sl = xpl.left) != null)
3108	>	sl.red = false;
3109	>	}
3110	>	if (xp != null) {
3111	>	xp.red = false;
3112	>	root = rotateRight(root, xp);
3113	>	}
3114	>	x = root;
3115	>	}
3116	>	}
3117	>	}
3118	>	}
3119	>	}
3120	>
3121	>	/**
3122	>	* Recursive invariant check
3123	>	*/
3124	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3125	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3126	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3127	>	if (tb != null && tb.next != t)
3128	>	return false;
3129	>	if (tn != null && tn.prev != t)
3130	>	return false;
3131	>	if (tp != null && t != tp.left && t != tp.right)
3132	>	return false;
3133	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3134	>	return false;
3135	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3136	>	return false;
3137	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3138	>	return false;
3139	>	if (tl != null && !checkInvariants(tl))
3140	>	return false;
3141	>	if (tr != null && !checkInvariants(tr))
3142	>	return false;
3143	>	return true;
3144	>	}
3145	>
3146	>	private static final sun.misc.Unsafe U;
3147	>	private static final long LOCKSTATE;
3148	>	static {
3149	>	try {
3150	>	U = getUnsafe();
3151	>	Class<?> k = TreeBin.class;
3152	>	LOCKSTATE = U.objectFieldOffset
3153	>	(k.getDeclaredField("lockState"));
3154	>	} catch (Exception e) {
3155	>	throw new Error(e);
3156		}
3157		}
3195	–	return sb.append('}').toString();
3158		}
3159
3160	+	/* ----------------Table Traversal -------------- */
3161	+
3162		/**
3163	<	* Compares the specified object with this map for equality.
3164	<	* Returns {@code true} if the given object is a map with the same
3165	<	* mappings as this map.  This operation may return misleading
3166	<	* results if either map is concurrently modified during execution
3167	<	* of this method.
3163	>	* Records the table, its length, and current traversal index for a
3164	>	* traverser that must process a region of a forwarded table before
3165	>	* proceeding with current table.
3166	>	*/
3167	>	static final class TableStack<K,V> {
3168	>	int length;
3169	>	int index;
3170	>	Node<K,V>[] tab;
3171	>	TableStack<K,V> next;
3172	>	}
3173	>
3174	>	/**
3175	>	* Encapsulates traversal for methods such as containsValue; also
3176	>	* serves as a base class for other iterators and spliterators.
3177		*
3178	<	* @param o object to be compared for equality with this map
3179	<	* @return {@code true} if the specified object is equal to this map
3178	>	* Method advance visits once each still-valid node that was
3179	>	* reachable upon iterator construction. It might miss some that
3180	>	* were added to a bin after the bin was visited, which is OK wrt
3181	>	* consistency guarantees. Maintaining this property in the face
3182	>	* of possible ongoing resizes requires a fair amount of
3183	>	* bookkeeping state that is difficult to optimize away amidst
3184	>	* volatile accesses.  Even so, traversal maintains reasonable
3185	>	* throughput.
3186	>	*
3187	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3188	>	* However, if the table has been resized, then all future steps
3189	>	* must traverse both the bin at the current index as well as at
3190	>	* (index + baseSize); and so on for further resizings. To
3191	>	* paranoically cope with potential sharing by users of iterators
3192	>	* across threads, iteration terminates if a bounds checks fails
3193	>	* for a table read.
3194		*/
3195	<	public boolean equals(Object o) {
3196	<	if (o != this) {
3197	<	if (!(o instanceof Map))
3198	<	return false;
3199	<	Map<?,?> m = (Map<?,?>) o;
3200	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3201	<	Object val;
3202	<	while ((val = it.advance()) != null) {
3203	<	Object v = m.get(it.nextKey);
3204	<	if (v == null || (v != val && !v.equals(val)))
3205	<	return false;
3195	>	static class Traverser<K,V> {
3196	>	Node<K,V>[] tab;        // current table; updated if resized
3197	>	Node<K,V> next;         // the next entry to use
3198	>	TableStack<K,V> stack, spare; // to save/restore on ForwardingNodes
3199	>	int index;              // index of bin to use next
3200	>	int baseIndex;          // current index of initial table
3201	>	int baseLimit;          // index bound for initial table
3202	>	final int baseSize;     // initial table size
3203	>
3204	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3205	>	this.tab = tab;
3206	>	this.baseSize = size;
3207	>	this.baseIndex = this.index = index;
3208	>	this.baseLimit = limit;
3209	>	this.next = null;
3210	>	}
3211	>
3212	>	/**
3213	>	* Advances if possible, returning next valid node, or null if none.
3214	>	*/
3215	>	final Node<K,V> advance() {
3216	>	Node<K,V> e;
3217	>	if ((e = next) != null)
3218	>	e = e.next;
3219	>	for (;;) {
3220	>	Node<K,V>[] t; int i, n;  // must use locals in checks
3221	>	if (e != null)
3222	>	return next = e;
3223	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3224	>	(n = t.length) <= (i = index) || i < 0)
3225	>	return next = null;
3226	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
3227	>	if (e instanceof ForwardingNode) {
3228	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3229	>	e = null;
3230	>	pushState(t, i, n);
3231	>	continue;
3232	>	}
3233	>	else if (e instanceof TreeBin)
3234	>	e = ((TreeBin<K,V>)e).first;
3235	>	else
3236	>	e = null;
3237	>	}
3238	>	if (stack != null)
3239	>	recoverState(n);
3240	>	else if ((index = i + baseSize) >= n)
3241	>	index = ++baseIndex; // visit upper slots if present
3242		}
3243	<	for (Map.Entry<?,?> e : m.entrySet()) {
3244	<	Object mk, mv, v;
3245	<	if ((mk = e.getKey()) == null ||
3246	<	(mv = e.getValue()) == null ||
3247	<	(v = internalGet(mk)) == null ||
3248	<	(mv != v && !mv.equals(v)))
3249	<	return false;
3243	>	}
3244	>
3245	>	/**
3246	>	* Saves traversal state upon encountering a forwarding node.
3247	>	*/
3248	>	private void pushState(Node<K,V>[] t, int i, int n) {
3249	>	TableStack<K,V> s = spare;  // reuse if possible
3250	>	if (s != null)
3251	>	spare = s.next;
3252	>	else
3253	>	s = new TableStack<K,V>();
3254	>	s.tab = t;
3255	>	s.length = n;
3256	>	s.index = i;
3257	>	s.next = stack;
3258	>	stack = s;
3259	>	}
3260	>
3261	>	/**
3262	>	* Possibly pops traversal state.
3263	>	*
3264	>	* @param n length of current table
3265	>	*/
3266	>	private void recoverState(int n) {
3267	>	TableStack<K,V> s; int len;
3268	>	while ((s = stack) != null && (index += (len = s.length)) >= n) {
3269	>	n = len;
3270	>	index = s.index;
3271	>	tab = s.tab;
3272	>	s.tab = null;
3273	>	TableStack<K,V> next = s.next;
3274	>	s.next = spare; // save for reuse
3275	>	stack = next;
3276	>	spare = s;
3277		}
3278	+	if (s == null && (index += baseSize) >= n)
3279	+	index = ++baseIndex;
3280		}
3229	–	return true;
3281		}
3282
3283	<	/* ----------------Iterators -------------- */
3284	<
3285	<	@SuppressWarnings("serial") static final class KeyIterator<K,V> extends Traverser<K,V,Object>
3286	<	implements Spliterator<K>, Enumeration<K> {
3287	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3288	<	KeyIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3289	<	super(map, it, -1);
3283	>	/**
3284	>	* Base of key, value, and entry Iterators. Adds fields to
3285	>	* Traverser to support iterator.remove.
3286	>	*/
3287	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3288	>	final ConcurrentHashMapV8<K,V> map;
3289	>	Node<K,V> lastReturned;
3290	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3291	>	ConcurrentHashMapV8<K,V> map) {
3292	>	super(tab, size, index, limit);
3293	>	this.map = map;
3294	>	advance();
3295		}
3296	<	public KeyIterator<K,V> split() {
3297	<	if (nextKey != null)
3296	>
3297	>	public final boolean hasNext() { return next != null; }
3298	>	public final boolean hasMoreElements() { return next != null; }
3299	>
3300	>	public final void remove() {
3301	>	Node<K,V> p;
3302	>	if ((p = lastReturned) == null)
3303		throw new IllegalStateException();
3304	<	return new KeyIterator<K,V>(map, this);
3304	>	lastReturned = null;
3305	>	map.replaceNode(p.key, null, null);
3306		}
3307	<	@SuppressWarnings("unchecked") public final K next() {
3308	<	if (nextVal == null && advance() == null)
3307	>	}
3308	>
3309	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3310	>	implements Iterator<K>, Enumeration<K> {
3311	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3312	>	ConcurrentHashMapV8<K,V> map) {
3313	>	super(tab, index, size, limit, map);
3314	>	}
3315	>
3316	>	public final K next() {
3317	>	Node<K,V> p;
3318	>	if ((p = next) == null)
3319		throw new NoSuchElementException();
3320	<	Object k = nextKey;
3321	<	nextVal = null;
3322	<	return (K) k;
3320	>	K k = p.key;
3321	>	lastReturned = p;
3322	>	advance();
3323	>	return k;
3324		}
3325
3326		public final K nextElement() { return next(); }
3327		}
3328
3329	<	@SuppressWarnings("serial") static final class ValueIterator<K,V> extends Traverser<K,V,Object>
3330	<	implements Spliterator<V>, Enumeration<V> {
3331	<	ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3332	<	ValueIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3333	<	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);
3329	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3330	>	implements Iterator<V>, Enumeration<V> {
3331	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3332	>	ConcurrentHashMapV8<K,V> map) {
3333	>	super(tab, index, size, limit, map);
3334		}
3335
3336	<	@SuppressWarnings("unchecked") public final V next() {
3337	<	Object v;
3338	<	if ((v = nextVal) == null && (v = advance()) == null)
3336	>	public final V next() {
3337	>	Node<K,V> p;
3338	>	if ((p = next) == null)
3339		throw new NoSuchElementException();
3340	<	nextVal = null;
3341	<	return (V) v;
3340	>	V v = p.val;
3341	>	lastReturned = p;
3342	>	advance();
3343	>	return v;
3344		}
3345
3346		public final V nextElement() { return next(); }
3347		}
3348
3349	<	@SuppressWarnings("serial") static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3350	<	implements Spliterator<Map.Entry<K,V>> {
3351	<	EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3352	<	EntryIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3353	<	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);
3349	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3350	>	implements Iterator<Map.Entry<K,V>> {
3351	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3352	>	ConcurrentHashMapV8<K,V> map) {
3353	>	super(tab, index, size, limit, map);
3354		}
3355
3356	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3357	<	Object v;
3358	<	if ((v = nextVal) == null && (v = advance()) == null)
3356	>	public final Map.Entry<K,V> next() {
3357	>	Node<K,V> p;
3358	>	if ((p = next) == null)
3359		throw new NoSuchElementException();
3360	<	Object k = nextKey;
3361	<	nextVal = null;
3362	<	return new MapEntry<K,V>((K)k, (V)v, map);
3360	>	K k = p.key;
3361	>	V v = p.val;
3362	>	lastReturned = p;
3363	>	advance();
3364	>	return new MapEntry<K,V>(k, v, map);
3365		}
3366		}
3367
3368		/**
3369	<	* Exported Entry for iterators
3369	>	* Exported Entry for EntryIterator
3370		*/
3371	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3371	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3372		final K key; // non-null
3373		V val;       // non-null
3374	<	final ConcurrentHashMapV8<K, V> map;
3375	<	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3374	>	final ConcurrentHashMapV8<K,V> map;
3375	>	MapEntry(K key, V val, ConcurrentHashMapV8<K,V> map) {
3376		this.key = key;
3377		this.val = val;
3378		this.map = map;
3379		}
3380	<	public final K getKey()       { return key; }
3381	<	public final V getValue()     { return val; }
3382	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3383	<	public final String toString(){ return key + "=" + val; }
3380	>	public K getKey()        { return key; }
3381	>	public V getValue()      { return val; }
3382	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3383	>	public String toString() { return key + "=" + val; }
3384
3385	<	public final boolean equals(Object o) {
3385	>	public boolean equals(Object o) {
3386		Object k, v; Map.Entry<?,?> e;
3387		return ((o instanceof Map.Entry) &&
3388		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3329 | Line 3396 | public class ConcurrentHashMapV8<K, V>
3396		* value to return is somewhat arbitrary here. Since we do not
3397		* necessarily track asynchronous changes, the most recent
3398		* "previous" value could be different from what we return (or
3399	<	* could even have been removed in which case the put will
3399	>	* could even have been removed, in which case the put will
3400		* re-establish). We do not and cannot guarantee more.
3401		*/
3402	<	public final V setValue(V value) {
3402	>	public V setValue(V value) {
3403		if (value == null) throw new NullPointerException();
3404		V v = val;
3405		val = value;
#	Line 3341 | Line 3408 | public class ConcurrentHashMapV8<K, V>
3408		}
3409		}
3410
3411	<	/**
3412	<	* Returns exportable snapshot entry for the given key and value
3413	<	* when write-through can't or shouldn't be used.
3414	<	*/
3415	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
3416	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
3417	<	}
3411	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3412	>	implements ConcurrentHashMapSpliterator<K> {
3413	>	long est;               // size estimate
3414	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3415	>	long est) {
3416	>	super(tab, size, index, limit);
3417	>	this.est = est;
3418	>	}
3419	>
3420	>	public ConcurrentHashMapSpliterator<K> trySplit() {
3421	>	int i, f, h;
3422	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3423	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3424	>	f, est >>>= 1);
3425	>	}
3426
3427	<	/* ---------------- Serialization Support -------------- */
3427	>	public void forEachRemaining(Action<? super K> action) {
3428	>	if (action == null) throw new NullPointerException();
3429	>	for (Node<K,V> p; (p = advance()) != null;)
3430	>	action.apply(p.key);
3431	>	}
3432	>
3433	>	public boolean tryAdvance(Action<? super K> action) {
3434	>	if (action == null) throw new NullPointerException();
3435	>	Node<K,V> p;
3436	>	if ((p = advance()) == null)
3437	>	return false;
3438	>	action.apply(p.key);
3439	>	return true;
3440	>	}
3441	>
3442	>	public long estimateSize() { return est; }
3443
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; }
3444		}
3445
3446	<	/**
3447	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
3448	<	* stream (i.e., serializes it).
3449	<	* @param s the stream
3450	<	* @serialData
3451	<	* the key (Object) and value (Object)
3452	<	* 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);
3446	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3447	>	implements ConcurrentHashMapSpliterator<V> {
3448	>	long est;               // size estimate
3449	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3450	>	long est) {
3451	>	super(tab, size, index, limit);
3452	>	this.est = est;
3453		}
3388	–	s.writeObject(null);
3389	–	s.writeObject(null);
3390	–	segments = null; // throw away
3391	–	}
3454
3455	<	/**
3456	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3457	<	* @param s the stream
3458	<	*/
3459	<	@SuppressWarnings("unchecked") private void readObject(java.io.ObjectInputStream s)
3460	<	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());
3455	>	public ConcurrentHashMapSpliterator<V> trySplit() {
3456	>	int i, f, h;
3457	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3458	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3459	>	f, est >>>= 1);
3460	>	}
3461
3462	<	// Create all nodes, then place in table once size is known
3463	<	long size = 0L;
3464	<	Node p = null;
3465	<	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;
3462	>	public void forEachRemaining(Action<? super V> action) {
3463	>	if (action == null) throw new NullPointerException();
3464	>	for (Node<K,V> p; (p = advance()) != null;)
3465	>	action.apply(p.val);
3466		}
3467	<	if (p != null) {
3468	<	boolean init = false;
3469	<	int n;
3470	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3471	<	n = MAXIMUM_CAPACITY;
3472	<	else {
3473	<	int sz = (int)size;
3474	<	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	<	}
3467	>
3468	>	public boolean tryAdvance(Action<? super V> action) {
3469	>	if (action == null) throw new NullPointerException();
3470	>	Node<K,V> p;
3471	>	if ((p = advance()) == null)
3472	>	return false;
3473	>	action.apply(p.val);
3474	>	return true;
3475		}
3476	+
3477	+	public long estimateSize() { return est; }
3478	+
3479		}
3480
3481	+	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3482	+	implements ConcurrentHashMapSpliterator<Map.Entry<K,V>> {
3483	+	final ConcurrentHashMapV8<K,V> map; // To export MapEntry
3484	+	long est;               // size estimate
3485	+	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3486	+	long est, ConcurrentHashMapV8<K,V> map) {
3487	+	super(tab, size, index, limit);
3488	+	this.map = map;
3489	+	this.est = est;
3490	+	}
3491
3492	<	// -------------------------------------------------------
3492	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> trySplit() {
3493	>	int i, f, h;
3494	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3495	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3496	>	f, est >>>= 1, map);
3497	>	}
3498
3499	<	// Sams
3500	<	/** Interface describing a void action of one argument */
3501	<	public interface Action<A> { void apply(A a); }
3502	<	/** Interface describing a void action of two arguments */
3503	<	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); }
3499	>	public void forEachRemaining(Action<? super Map.Entry<K,V>> action) {
3500	>	if (action == null) throw new NullPointerException();
3501	>	for (Node<K,V> p; (p = advance()) != null; )
3502	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3503	>	}
3504
3505	+	public boolean tryAdvance(Action<? super Map.Entry<K,V>> action) {
3506	+	if (action == null) throw new NullPointerException();
3507	+	Node<K,V> p;
3508	+	if ((p = advance()) == null)
3509	+	return false;
3510	+	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3511	+	return true;
3512	+	}
3513
3514	<	// -------------------------------------------------------
3514	>	public long estimateSize() { return est; }
3515	>
3516	>	}
3517	>
3518	>	// Parallel bulk operations
3519	>
3520	>	/**
3521	>	* Computes initial batch value for bulk tasks. The returned value
3522	>	* is approximately exp2 of the number of times (minus one) to
3523	>	* split task by two before executing leaf action. This value is
3524	>	* faster to compute and more convenient to use as a guide to
3525	>	* splitting than is the depth, since it is used while dividing by
3526	>	* two anyway.
3527	>	*/
3528	>	final int batchFor(long b) {
3529	>	long n;
3530	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3531	>	return 0;
3532	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3533	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3534	>	}
3535
3536		/**
3537		* Performs the given action for each (key, value).
3538		*
3539	+	* @param parallelismThreshold the (estimated) number of elements
3540	+	* needed for this operation to be executed in parallel
3541		* @param action the action
3542	+	* @since 1.8
3543		*/
3544	<	public void forEach(BiAction<K,V> action) {
3545	<	ForkJoinTasks.forEach
3546	<	(this, action).invoke();
3544	>	public void forEach(long parallelismThreshold,
3545	>	BiAction<? super K,? super V> action) {
3546	>	if (action == null) throw new NullPointerException();
3547	>	new ForEachMappingTask<K,V>
3548	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3549	>	action).invoke();
3550		}
3551
3552		/**
3553		* Performs the given action for each non-null transformation
3554		* of each (key, value).
3555		*
3556	+	* @param parallelismThreshold the (estimated) number of elements
3557	+	* needed for this operation to be executed in parallel
3558		* @param transformer a function returning the transformation
3559	<	* for an element, or null of there is no transformation (in
3560	<	* which case the action is not applied).
3559	>	* for an element, or null if there is no transformation (in
3560	>	* which case the action is not applied)
3561		* @param action the action
3562	+	* @since 1.8
3563		*/
3564	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3565	<	Action<U> action) {
3566	<	ForkJoinTasks.forEach
3567	<	(this, transformer, action).invoke();
3564	>	public <U> void forEach(long parallelismThreshold,
3565	>	BiFun<? super K, ? super V, ? extends U> transformer,
3566	>	Action<? super U> action) {
3567	>	if (transformer == null || action == null)
3568	>	throw new NullPointerException();
3569	>	new ForEachTransformedMappingTask<K,V,U>
3570	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3571	>	transformer, action).invoke();
3572		}
3573
3574		/**
#	Line 3546 | Line 3578 | public class ConcurrentHashMapV8<K, V>
3578		* results of any other parallel invocations of the search
3579		* function are ignored.
3580		*
3581	+	* @param parallelismThreshold the (estimated) number of elements
3582	+	* needed for this operation to be executed in parallel
3583		* @param searchFunction a function returning a non-null
3584		* result on success, else null
3585		* @return a non-null result from applying the given search
3586		* function on each (key, value), or null if none
3587	+	* @since 1.8
3588		*/
3589	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3590	<	return ForkJoinTasks.search
3591	<	(this, searchFunction).invoke();
3589	>	public <U> U search(long parallelismThreshold,
3590	>	BiFun<? super K, ? super V, ? extends U> searchFunction) {
3591	>	if (searchFunction == null) throw new NullPointerException();
3592	>	return new SearchMappingsTask<K,V,U>
3593	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3594	>	searchFunction, new AtomicReference<U>()).invoke();
3595		}
3596
3597		/**
#	Line 3561 | Line 3599 | public class ConcurrentHashMapV8<K, V>
3599		* of all (key, value) pairs using the given reducer to
3600		* combine values, or null if none.
3601		*
3602	+	* @param parallelismThreshold the (estimated) number of elements
3603	+	* needed for this operation to be executed in parallel
3604		* @param transformer a function returning the transformation
3605	<	* for an element, or null of there is no transformation (in
3606	<	* which case it is not combined).
3605	>	* for an element, or null if there is no transformation (in
3606	>	* which case it is not combined)
3607		* @param reducer a commutative associative combining function
3608		* @return the result of accumulating the given transformation
3609		* of all (key, value) pairs
3610	+	* @since 1.8
3611		*/
3612	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3612	>	public <U> U reduce(long parallelismThreshold,
3613	>	BiFun<? super K, ? super V, ? extends U> transformer,
3614		BiFun<? super U, ? super U, ? extends U> reducer) {
3615	<	return ForkJoinTasks.reduce
3616	<	(this, transformer, reducer).invoke();
3615	>	if (transformer == null || reducer == null)
3616	>	throw new NullPointerException();
3617	>	return new MapReduceMappingsTask<K,V,U>
3618	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3619	>	null, transformer, reducer).invoke();
3620		}
3621
3622		/**
#	Line 3579 | Line 3624 | public class ConcurrentHashMapV8<K, V>
3624		* of all (key, value) pairs using the given reducer to
3625		* combine values, and the given basis as an identity value.
3626		*
3627	+	* @param parallelismThreshold the (estimated) number of elements
3628	+	* needed for this operation to be executed in parallel
3629		* @param transformer a function returning the transformation
3630		* for an element
3631		* @param basis the identity (initial default value) for the reduction
3632		* @param reducer a commutative associative combining function
3633		* @return the result of accumulating the given transformation
3634		* of all (key, value) pairs
3635	+	* @since 1.8
3636		*/
3637	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3637	>	public double reduceToDouble(long parallelismThreshold,
3638	>	ObjectByObjectToDouble<? super K, ? super V> transformer,
3639		double basis,
3640		DoubleByDoubleToDouble reducer) {
3641	<	return ForkJoinTasks.reduceToDouble
3642	<	(this, transformer, basis, reducer).invoke();
3641	>	if (transformer == null || reducer == null)
3642	>	throw new NullPointerException();
3643	>	return new MapReduceMappingsToDoubleTask<K,V>
3644	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3645	>	null, transformer, basis, reducer).invoke();
3646		}
3647
3648		/**
#	Line 3598 | Line 3650 | public class ConcurrentHashMapV8<K, V>
3650		* of all (key, value) pairs using the given reducer to
3651		* combine values, and the given basis as an identity value.
3652		*
3653	+	* @param parallelismThreshold the (estimated) number of elements
3654	+	* needed for this operation to be executed in parallel
3655		* @param transformer a function returning the transformation
3656		* for an element
3657		* @param basis the identity (initial default value) for the reduction
3658		* @param reducer a commutative associative combining function
3659		* @return the result of accumulating the given transformation
3660		* of all (key, value) pairs
3661	+	* @since 1.8
3662		*/
3663	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3663	>	public long reduceToLong(long parallelismThreshold,
3664	>	ObjectByObjectToLong<? super K, ? super V> transformer,
3665		long basis,
3666		LongByLongToLong reducer) {
3667	<	return ForkJoinTasks.reduceToLong
3668	<	(this, transformer, basis, reducer).invoke();
3667	>	if (transformer == null || reducer == null)
3668	>	throw new NullPointerException();
3669	>	return new MapReduceMappingsToLongTask<K,V>
3670	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3671	>	null, transformer, basis, reducer).invoke();
3672		}
3673
3674		/**
#	Line 3617 | Line 3676 | public class ConcurrentHashMapV8<K, V>
3676		* of all (key, value) pairs using the given reducer to
3677		* combine values, and the given basis as an identity value.
3678		*
3679	+	* @param parallelismThreshold the (estimated) number of elements
3680	+	* needed for this operation to be executed in parallel
3681		* @param transformer a function returning the transformation
3682		* for an element
3683		* @param basis the identity (initial default value) for the reduction
3684		* @param reducer a commutative associative combining function
3685		* @return the result of accumulating the given transformation
3686		* of all (key, value) pairs
3687	+	* @since 1.8
3688		*/
3689	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3689	>	public int reduceToInt(long parallelismThreshold,
3690	>	ObjectByObjectToInt<? super K, ? super V> transformer,
3691		int basis,
3692		IntByIntToInt reducer) {
3693	<	return ForkJoinTasks.reduceToInt
3694	<	(this, transformer, basis, reducer).invoke();
3693	>	if (transformer == null || reducer == null)
3694	>	throw new NullPointerException();
3695	>	return new MapReduceMappingsToIntTask<K,V>
3696	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3697	>	null, transformer, basis, reducer).invoke();
3698		}
3699
3700		/**
3701		* Performs the given action for each key.
3702		*
3703	+	* @param parallelismThreshold the (estimated) number of elements
3704	+	* needed for this operation to be executed in parallel
3705		* @param action the action
3706	+	* @since 1.8
3707		*/
3708	<	public void forEachKey(Action<K> action) {
3709	<	ForkJoinTasks.forEachKey
3710	<	(this, action).invoke();
3708	>	public void forEachKey(long parallelismThreshold,
3709	>	Action<? super K> action) {
3710	>	if (action == null) throw new NullPointerException();
3711	>	new ForEachKeyTask<K,V>
3712	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3713	>	action).invoke();
3714		}
3715
3716		/**
3717		* Performs the given action for each non-null transformation
3718		* of each key.
3719		*
3720	+	* @param parallelismThreshold the (estimated) number of elements
3721	+	* needed for this operation to be executed in parallel
3722		* @param transformer a function returning the transformation
3723	<	* for an element, or null of there is no transformation (in
3724	<	* which case the action is not applied).
3723	>	* for an element, or null if there is no transformation (in
3724	>	* which case the action is not applied)
3725		* @param action the action
3726	+	* @since 1.8
3727		*/
3728	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3729	<	Action<U> action) {
3730	<	ForkJoinTasks.forEachKey
3731	<	(this, transformer, action).invoke();
3728	>	public <U> void forEachKey(long parallelismThreshold,
3729	>	Fun<? super K, ? extends U> transformer,
3730	>	Action<? super U> action) {
3731	>	if (transformer == null || action == null)
3732	>	throw new NullPointerException();
3733	>	new ForEachTransformedKeyTask<K,V,U>
3734	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3735	>	transformer, action).invoke();
3736		}
3737
3738		/**
#	Line 3663 | Line 3742 | public class ConcurrentHashMapV8<K, V>
3742		* any other parallel invocations of the search function are
3743		* ignored.
3744		*
3745	+	* @param parallelismThreshold the (estimated) number of elements
3746	+	* needed for this operation to be executed in parallel
3747		* @param searchFunction a function returning a non-null
3748		* result on success, else null
3749		* @return a non-null result from applying the given search
3750		* function on each key, or null if none
3751	+	* @since 1.8
3752		*/
3753	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3754	<	return ForkJoinTasks.searchKeys
3755	<	(this, searchFunction).invoke();
3753	>	public <U> U searchKeys(long parallelismThreshold,
3754	>	Fun<? super K, ? extends U> searchFunction) {
3755	>	if (searchFunction == null) throw new NullPointerException();
3756	>	return new SearchKeysTask<K,V,U>
3757	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3758	>	searchFunction, new AtomicReference<U>()).invoke();
3759		}
3760
3761		/**
3762		* Returns the result of accumulating all keys using the given
3763		* reducer to combine values, or null if none.
3764		*
3765	+	* @param parallelismThreshold the (estimated) number of elements
3766	+	* needed for this operation to be executed in parallel
3767		* @param reducer a commutative associative combining function
3768		* @return the result of accumulating all keys using the given
3769		* reducer to combine values, or null if none
3770	+	* @since 1.8
3771		*/
3772	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3773	<	return ForkJoinTasks.reduceKeys
3774	<	(this, reducer).invoke();
3772	>	public K reduceKeys(long parallelismThreshold,
3773	>	BiFun<? super K, ? super K, ? extends K> reducer) {
3774	>	if (reducer == null) throw new NullPointerException();
3775	>	return new ReduceKeysTask<K,V>
3776	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3777	>	null, reducer).invoke();
3778		}
3779
3780		/**
#	Line 3691 | Line 3782 | public class ConcurrentHashMapV8<K, V>
3782		* of all keys using the given reducer to combine values, or
3783		* null if none.
3784		*
3785	+	* @param parallelismThreshold the (estimated) number of elements
3786	+	* needed for this operation to be executed in parallel
3787		* @param transformer a function returning the transformation
3788	<	* for an element, or null of there is no transformation (in
3789	<	* which case it is not combined).
3788	>	* for an element, or null if there is no transformation (in
3789	>	* which case it is not combined)
3790		* @param reducer a commutative associative combining function
3791		* @return the result of accumulating the given transformation
3792		* of all keys
3793	+	* @since 1.8
3794		*/
3795	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3796	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3797	<	return ForkJoinTasks.reduceKeys
3798	<	(this, transformer, reducer).invoke();
3795	>	public <U> U reduceKeys(long parallelismThreshold,
3796	>	Fun<? super K, ? extends U> transformer,
3797	>	BiFun<? super U, ? super U, ? extends U> reducer) {
3798	>	if (transformer == null || reducer == null)
3799	>	throw new NullPointerException();
3800	>	return new MapReduceKeysTask<K,V,U>
3801	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3802	>	null, transformer, reducer).invoke();
3803		}
3804
3805		/**
#	Line 3709 | Line 3807 | public class ConcurrentHashMapV8<K, V>
3807		* of all keys using the given reducer to combine values, and
3808		* the given basis as an identity value.
3809		*
3810	+	* @param parallelismThreshold the (estimated) number of elements
3811	+	* needed for this operation to be executed in parallel
3812		* @param transformer a function returning the transformation
3813		* for an element
3814		* @param basis the identity (initial default value) for the reduction
3815		* @param reducer a commutative associative combining function
3816	<	* @return  the result of accumulating the given transformation
3816	>	* @return the result of accumulating the given transformation
3817		* of all keys
3818	+	* @since 1.8
3819		*/
3820	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3820	>	public double reduceKeysToDouble(long parallelismThreshold,
3821	>	ObjectToDouble<? super K> transformer,
3822		double basis,
3823		DoubleByDoubleToDouble reducer) {
3824	<	return ForkJoinTasks.reduceKeysToDouble
3825	<	(this, transformer, basis, reducer).invoke();
3824	>	if (transformer == null || reducer == null)
3825	>	throw new NullPointerException();
3826	>	return new MapReduceKeysToDoubleTask<K,V>
3827	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3828	>	null, transformer, basis, reducer).invoke();
3829		}
3830
3831		/**
#	Line 3728 | Line 3833 | public class ConcurrentHashMapV8<K, V>
3833		* of all keys using the given reducer to combine values, and
3834		* the given basis as an identity value.
3835		*
3836	+	* @param parallelismThreshold the (estimated) number of elements
3837	+	* needed for this operation to be executed in parallel
3838		* @param transformer a function returning the transformation
3839		* for an element
3840		* @param basis the identity (initial default value) for the reduction
3841		* @param reducer a commutative associative combining function
3842		* @return the result of accumulating the given transformation
3843		* of all keys
3844	+	* @since 1.8
3845		*/
3846	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3846	>	public long reduceKeysToLong(long parallelismThreshold,
3847	>	ObjectToLong<? super K> transformer,
3848		long basis,
3849		LongByLongToLong reducer) {
3850	<	return ForkJoinTasks.reduceKeysToLong
3851	<	(this, transformer, basis, reducer).invoke();
3850	>	if (transformer == null || reducer == null)
3851	>	throw new NullPointerException();
3852	>	return new MapReduceKeysToLongTask<K,V>
3853	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3854	>	null, transformer, basis, reducer).invoke();
3855		}
3856
3857		/**
#	Line 3747 | Line 3859 | public class ConcurrentHashMapV8<K, V>
3859		* of all keys using the given reducer to combine values, and
3860		* the given basis as an identity value.
3861		*
3862	+	* @param parallelismThreshold the (estimated) number of elements
3863	+	* needed for this operation to be executed in parallel
3864		* @param transformer a function returning the transformation
3865		* for an element
3866		* @param basis the identity (initial default value) for the reduction
3867		* @param reducer a commutative associative combining function
3868		* @return the result of accumulating the given transformation
3869		* of all keys
3870	+	* @since 1.8
3871		*/
3872	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3872	>	public int reduceKeysToInt(long parallelismThreshold,
3873	>	ObjectToInt<? super K> transformer,
3874		int basis,
3875		IntByIntToInt reducer) {
3876	<	return ForkJoinTasks.reduceKeysToInt
3877	<	(this, transformer, basis, reducer).invoke();
3876	>	if (transformer == null || reducer == null)
3877	>	throw new NullPointerException();
3878	>	return new MapReduceKeysToIntTask<K,V>
3879	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3880	>	null, transformer, basis, reducer).invoke();
3881		}
3882
3883		/**
3884		* Performs the given action for each value.
3885		*
3886	+	* @param parallelismThreshold the (estimated) number of elements
3887	+	* needed for this operation to be executed in parallel
3888		* @param action the action
3889	+	* @since 1.8
3890		*/
3891	<	public void forEachValue(Action<V> action) {
3892	<	ForkJoinTasks.forEachValue
3893	<	(this, action).invoke();
3891	>	public void forEachValue(long parallelismThreshold,
3892	>	Action<? super V> action) {
3893	>	if (action == null)
3894	>	throw new NullPointerException();
3895	>	new ForEachValueTask<K,V>
3896	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3897	>	action).invoke();
3898		}
3899
3900		/**
3901		* Performs the given action for each non-null transformation
3902		* of each value.
3903		*
3904	+	* @param parallelismThreshold the (estimated) number of elements
3905	+	* needed for this operation to be executed in parallel
3906		* @param transformer a function returning the transformation
3907	<	* for an element, or null of there is no transformation (in
3908	<	* which case the action is not applied).
3907	>	* for an element, or null if there is no transformation (in
3908	>	* which case the action is not applied)
3909	>	* @param action the action
3910	>	* @since 1.8
3911		*/
3912	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3913	<	Action<U> action) {
3914	<	ForkJoinTasks.forEachValue
3915	<	(this, transformer, action).invoke();
3912	>	public <U> void forEachValue(long parallelismThreshold,
3913	>	Fun<? super V, ? extends U> transformer,
3914	>	Action<? super U> action) {
3915	>	if (transformer == null || action == null)
3916	>	throw new NullPointerException();
3917	>	new ForEachTransformedValueTask<K,V,U>
3918	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3919	>	transformer, action).invoke();
3920		}
3921
3922		/**
#	Line 3792 | Line 3926 | public class ConcurrentHashMapV8<K, V>
3926		* any other parallel invocations of the search function are
3927		* ignored.
3928		*
3929	+	* @param parallelismThreshold the (estimated) number of elements
3930	+	* needed for this operation to be executed in parallel
3931		* @param searchFunction a function returning a non-null
3932		* result on success, else null
3933		* @return a non-null result from applying the given search
3934		* function on each value, or null if none
3935	<	*
3935	>	* @since 1.8
3936		*/
3937	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3938	<	return ForkJoinTasks.searchValues
3939	<	(this, searchFunction).invoke();
3937	>	public <U> U searchValues(long parallelismThreshold,
3938	>	Fun<? super V, ? extends U> searchFunction) {
3939	>	if (searchFunction == null) throw new NullPointerException();
3940	>	return new SearchValuesTask<K,V,U>
3941	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3942	>	searchFunction, new AtomicReference<U>()).invoke();
3943		}
3944
3945		/**
3946		* Returns the result of accumulating all values using the
3947		* given reducer to combine values, or null if none.
3948		*
3949	+	* @param parallelismThreshold the (estimated) number of elements
3950	+	* needed for this operation to be executed in parallel
3951		* @param reducer a commutative associative combining function
3952	<	* @return  the result of accumulating all values
3952	>	* @return the result of accumulating all values
3953	>	* @since 1.8
3954		*/
3955	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3956	<	return ForkJoinTasks.reduceValues
3957	<	(this, reducer).invoke();
3955	>	public V reduceValues(long parallelismThreshold,
3956	>	BiFun<? super V, ? super V, ? extends V> reducer) {
3957	>	if (reducer == null) throw new NullPointerException();
3958	>	return new ReduceValuesTask<K,V>
3959	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3960	>	null, reducer).invoke();
3961		}
3962
3963		/**
#	Line 3820 | Line 3965 | public class ConcurrentHashMapV8<K, V>
3965		* of all values using the given reducer to combine values, or
3966		* null if none.
3967		*
3968	+	* @param parallelismThreshold the (estimated) number of elements
3969	+	* needed for this operation to be executed in parallel
3970		* @param transformer a function returning the transformation
3971	<	* for an element, or null of there is no transformation (in
3972	<	* which case it is not combined).
3971	>	* for an element, or null if there is no transformation (in
3972	>	* which case it is not combined)
3973		* @param reducer a commutative associative combining function
3974		* @return the result of accumulating the given transformation
3975		* of all values
3976	+	* @since 1.8
3977		*/
3978	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3978	>	public <U> U reduceValues(long parallelismThreshold,
3979	>	Fun<? super V, ? extends U> transformer,
3980		BiFun<? super U, ? super U, ? extends U> reducer) {
3981	<	return ForkJoinTasks.reduceValues
3982	<	(this, transformer, reducer).invoke();
3981	>	if (transformer == null || reducer == null)
3982	>	throw new NullPointerException();
3983	>	return new MapReduceValuesTask<K,V,U>
3984	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3985	>	null, transformer, reducer).invoke();
3986		}
3987
3988		/**
#	Line 3838 | Line 3990 | public class ConcurrentHashMapV8<K, V>
3990		* of all values using the given reducer to combine values,
3991		* and the given basis as an identity value.
3992		*
3993	+	* @param parallelismThreshold the (estimated) number of elements
3994	+	* needed for this operation to be executed in parallel
3995		* @param transformer a function returning the transformation
3996		* for an element
3997		* @param basis the identity (initial default value) for the reduction
3998		* @param reducer a commutative associative combining function
3999		* @return the result of accumulating the given transformation
4000		* of all values
4001	+	* @since 1.8
4002		*/
4003	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
4003	>	public double reduceValuesToDouble(long parallelismThreshold,
4004	>	ObjectToDouble<? super V> transformer,
4005		double basis,
4006		DoubleByDoubleToDouble reducer) {
4007	<	return ForkJoinTasks.reduceValuesToDouble
4008	<	(this, transformer, basis, reducer).invoke();
4007	>	if (transformer == null || reducer == null)
4008	>	throw new NullPointerException();
4009	>	return new MapReduceValuesToDoubleTask<K,V>
4010	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4011	>	null, transformer, basis, reducer).invoke();
4012		}
4013
4014		/**
#	Line 3857 | Line 4016 | public class ConcurrentHashMapV8<K, V>
4016		* of all values using the given reducer to combine values,
4017		* and the given basis as an identity value.
4018		*
4019	+	* @param parallelismThreshold the (estimated) number of elements
4020	+	* needed for this operation to be executed in parallel
4021		* @param transformer a function returning the transformation
4022		* for an element
4023		* @param basis the identity (initial default value) for the reduction
4024		* @param reducer a commutative associative combining function
4025		* @return the result of accumulating the given transformation
4026		* of all values
4027	+	* @since 1.8
4028		*/
4029	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
4029	>	public long reduceValuesToLong(long parallelismThreshold,
4030	>	ObjectToLong<? super V> transformer,
4031		long basis,
4032		LongByLongToLong reducer) {
4033	<	return ForkJoinTasks.reduceValuesToLong
4034	<	(this, transformer, basis, reducer).invoke();
4033	>	if (transformer == null || reducer == null)
4034	>	throw new NullPointerException();
4035	>	return new MapReduceValuesToLongTask<K,V>
4036	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4037	>	null, transformer, basis, reducer).invoke();
4038		}
4039
4040		/**
#	Line 3876 | Line 4042 | public class ConcurrentHashMapV8<K, V>
4042		* of all values using the given reducer to combine values,
4043		* and the given basis as an identity value.
4044		*
4045	+	* @param parallelismThreshold the (estimated) number of elements
4046	+	* needed for this operation to be executed in parallel
4047		* @param transformer a function returning the transformation
4048		* for an element
4049		* @param basis the identity (initial default value) for the reduction
4050		* @param reducer a commutative associative combining function
4051		* @return the result of accumulating the given transformation
4052		* of all values
4053	+	* @since 1.8
4054		*/
4055	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
4055	>	public int reduceValuesToInt(long parallelismThreshold,
4056	>	ObjectToInt<? super V> transformer,
4057		int basis,
4058		IntByIntToInt reducer) {
4059	<	return ForkJoinTasks.reduceValuesToInt
4060	<	(this, transformer, basis, reducer).invoke();
4059	>	if (transformer == null || reducer == null)
4060	>	throw new NullPointerException();
4061	>	return new MapReduceValuesToIntTask<K,V>
4062	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4063	>	null, transformer, basis, reducer).invoke();
4064		}
4065
4066		/**
4067		* Performs the given action for each entry.
4068		*
4069	+	* @param parallelismThreshold the (estimated) number of elements
4070	+	* needed for this operation to be executed in parallel
4071		* @param action the action
4072	+	* @since 1.8
4073		*/
4074	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
4075	<	ForkJoinTasks.forEachEntry
4076	<	(this, action).invoke();
4074	>	public void forEachEntry(long parallelismThreshold,
4075	>	Action<? super Map.Entry<K,V>> action) {
4076	>	if (action == null) throw new NullPointerException();
4077	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
4078	>	action).invoke();
4079		}
4080
4081		/**
4082		* Performs the given action for each non-null transformation
4083		* of each entry.
4084		*
4085	+	* @param parallelismThreshold the (estimated) number of elements
4086	+	* needed for this operation to be executed in parallel
4087		* @param transformer a function returning the transformation
4088	<	* for an element, or null of there is no transformation (in
4089	<	* which case the action is not applied).
4088	>	* for an element, or null if there is no transformation (in
4089	>	* which case the action is not applied)
4090		* @param action the action
4091	+	* @since 1.8
4092		*/
4093	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
4094	<	Action<U> action) {
4095	<	ForkJoinTasks.forEachEntry
4096	<	(this, transformer, action).invoke();
4093	>	public <U> void forEachEntry(long parallelismThreshold,
4094	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4095	>	Action<? super U> action) {
4096	>	if (transformer == null || action == null)
4097	>	throw new NullPointerException();
4098	>	new ForEachTransformedEntryTask<K,V,U>
4099	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4100	>	transformer, action).invoke();
4101		}
4102
4103		/**
#	Line 3922 | Line 4107 | public class ConcurrentHashMapV8<K, V>
4107		* any other parallel invocations of the search function are
4108		* ignored.
4109		*
4110	+	* @param parallelismThreshold the (estimated) number of elements
4111	+	* needed for this operation to be executed in parallel
4112		* @param searchFunction a function returning a non-null
4113		* result on success, else null
4114		* @return a non-null result from applying the given search
4115		* function on each entry, or null if none
4116	+	* @since 1.8
4117		*/
4118	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4119	<	return ForkJoinTasks.searchEntries
4120	<	(this, searchFunction).invoke();
4118	>	public <U> U searchEntries(long parallelismThreshold,
4119	>	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4120	>	if (searchFunction == null) throw new NullPointerException();
4121	>	return new SearchEntriesTask<K,V,U>
4122	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4123	>	searchFunction, new AtomicReference<U>()).invoke();
4124		}
4125
4126		/**
4127		* Returns the result of accumulating all entries using the
4128		* given reducer to combine values, or null if none.
4129		*
4130	+	* @param parallelismThreshold the (estimated) number of elements
4131	+	* needed for this operation to be executed in parallel
4132		* @param reducer a commutative associative combining function
4133		* @return the result of accumulating all entries
4134	+	* @since 1.8
4135		*/
4136	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4137	<	return ForkJoinTasks.reduceEntries
4138	<	(this, reducer).invoke();
4136	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4137	>	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4138	>	if (reducer == null) throw new NullPointerException();
4139	>	return new ReduceEntriesTask<K,V>
4140	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4141	>	null, reducer).invoke();
4142		}
4143
4144		/**
#	Line 3949 | Line 4146 | public class ConcurrentHashMapV8<K, V>
4146		* of all entries using the given reducer to combine values,
4147		* or null if none.
4148		*
4149	+	* @param parallelismThreshold the (estimated) number of elements
4150	+	* needed for this operation to be executed in parallel
4151		* @param transformer a function returning the transformation
4152	<	* for an element, or null of there is no transformation (in
4153	<	* which case it is not combined).
4152	>	* for an element, or null if there is no transformation (in
4153	>	* which case it is not combined)
4154		* @param reducer a commutative associative combining function
4155		* @return the result of accumulating the given transformation
4156		* of all entries
4157	+	* @since 1.8
4158		*/
4159	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4159	>	public <U> U reduceEntries(long parallelismThreshold,
4160	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4161		BiFun<? super U, ? super U, ? extends U> reducer) {
4162	<	return ForkJoinTasks.reduceEntries
4163	<	(this, transformer, reducer).invoke();
4162	>	if (transformer == null || reducer == null)
4163	>	throw new NullPointerException();
4164	>	return new MapReduceEntriesTask<K,V,U>
4165	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4166	>	null, transformer, reducer).invoke();
4167		}
4168
4169		/**
#	Line 3967 | Line 4171 | public class ConcurrentHashMapV8<K, V>
4171		* of all entries using the given reducer to combine values,
4172		* and the given basis as an identity value.
4173		*
4174	+	* @param parallelismThreshold the (estimated) number of elements
4175	+	* needed for this operation to be executed in parallel
4176		* @param transformer a function returning the transformation
4177		* for an element
4178		* @param basis the identity (initial default value) for the reduction
4179		* @param reducer a commutative associative combining function
4180		* @return the result of accumulating the given transformation
4181		* of all entries
4182	+	* @since 1.8
4183		*/
4184	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4184	>	public double reduceEntriesToDouble(long parallelismThreshold,
4185	>	ObjectToDouble<Map.Entry<K,V>> transformer,
4186		double basis,
4187		DoubleByDoubleToDouble reducer) {
4188	<	return ForkJoinTasks.reduceEntriesToDouble
4189	<	(this, transformer, basis, reducer).invoke();
4188	>	if (transformer == null || reducer == null)
4189	>	throw new NullPointerException();
4190	>	return new MapReduceEntriesToDoubleTask<K,V>
4191	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4192	>	null, transformer, basis, reducer).invoke();
4193		}
4194
4195		/**
#	Line 3986 | Line 4197 | public class ConcurrentHashMapV8<K, V>
4197		* of all entries using the given reducer to combine values,
4198		* and the given basis as an identity value.
4199		*
4200	+	* @param parallelismThreshold the (estimated) number of elements
4201	+	* needed for this operation to be executed in parallel
4202		* @param transformer a function returning the transformation
4203		* for an element
4204		* @param basis the identity (initial default value) for the reduction
4205		* @param reducer a commutative associative combining function
4206	<	* @return  the result of accumulating the given transformation
4206	>	* @return the result of accumulating the given transformation
4207		* of all entries
4208	+	* @since 1.8
4209		*/
4210	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4210	>	public long reduceEntriesToLong(long parallelismThreshold,
4211	>	ObjectToLong<Map.Entry<K,V>> transformer,
4212		long basis,
4213		LongByLongToLong reducer) {
4214	<	return ForkJoinTasks.reduceEntriesToLong
4215	<	(this, transformer, basis, reducer).invoke();
4214	>	if (transformer == null || reducer == null)
4215	>	throw new NullPointerException();
4216	>	return new MapReduceEntriesToLongTask<K,V>
4217	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4218	>	null, transformer, basis, reducer).invoke();
4219		}
4220
4221		/**
#	Line 4005 | Line 4223 | public class ConcurrentHashMapV8<K, V>
4223		* of all entries using the given reducer to combine values,
4224		* and the given basis as an identity value.
4225		*
4226	+	* @param parallelismThreshold the (estimated) number of elements
4227	+	* needed for this operation to be executed in parallel
4228		* @param transformer a function returning the transformation
4229		* for an element
4230		* @param basis the identity (initial default value) for the reduction
4231		* @param reducer a commutative associative combining function
4232		* @return the result of accumulating the given transformation
4233		* of all entries
4234	+	* @since 1.8
4235		*/
4236	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4236	>	public int reduceEntriesToInt(long parallelismThreshold,
4237	>	ObjectToInt<Map.Entry<K,V>> transformer,
4238		int basis,
4239		IntByIntToInt reducer) {
4240	<	return ForkJoinTasks.reduceEntriesToInt
4241	<	(this, transformer, basis, reducer).invoke();
4240	>	if (transformer == null || reducer == null)
4241	>	throw new NullPointerException();
4242	>	return new MapReduceEntriesToIntTask<K,V>
4243	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4244	>	null, transformer, basis, reducer).invoke();
4245		}
4246
4247	+
4248		/* ----------------Views -------------- */
4249
4250		/**
4251		* Base class for views.
4252		*/
4253	<	static abstract class CHMView<K, V> {
4254	<	final ConcurrentHashMapV8<K, V> map;
4255	<	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
4253	>	abstract static class CollectionView<K,V,E>
4254	>	implements Collection<E>, java.io.Serializable {
4255	>	private static final long serialVersionUID = 7249069246763182397L;
4256	>	final ConcurrentHashMapV8<K,V> map;
4257	>	CollectionView(ConcurrentHashMapV8<K,V> map)  { this.map = map; }
4258
4259		/**
4260		* Returns the map backing this view.
#	Line 4035 | Line 4263 | public class ConcurrentHashMapV8<K, V>
4263		*/
4264		public ConcurrentHashMapV8<K,V> getMap() { return map; }
4265
4266	<	public final int size()                 { return map.size(); }
4267	<	public final boolean isEmpty()          { return map.isEmpty(); }
4268	<	public final void clear()               { map.clear(); }
4266	>	/**
4267	>	* Removes all of the elements from this view, by removing all
4268	>	* the mappings from the map backing this view.
4269	>	*/
4270	>	public final void clear()      { map.clear(); }
4271	>	public final int size()        { return map.size(); }
4272	>	public final boolean isEmpty() { return map.isEmpty(); }
4273
4274		// implementations below rely on concrete classes supplying these
4275	<	abstract public Iterator<?> iterator();
4276	<	abstract public boolean contains(Object o);
4277	<	abstract public boolean remove(Object o);
4275	>	// abstract methods
4276	>	/**
4277	>	* Returns a "weakly consistent" iterator that will never
4278	>	* throw {@link ConcurrentModificationException}, and
4279	>	* guarantees to traverse elements as they existed upon
4280	>	* construction of the iterator, and may (but is not
4281	>	* guaranteed to) reflect any modifications subsequent to
4282	>	* construction.
4283	>	*/
4284	>	public abstract Iterator<E> iterator();
4285	>	public abstract boolean contains(Object o);
4286	>	public abstract boolean remove(Object o);
4287
4288		private static final String oomeMsg = "Required array size too large";
4289
4290		public final Object[] toArray() {
4291		long sz = map.mappingCount();
4292	<	if (sz > (long)(MAX_ARRAY_SIZE))
4292	>	if (sz > MAX_ARRAY_SIZE)
4293		throw new OutOfMemoryError(oomeMsg);
4294		int n = (int)sz;
4295		Object[] r = new Object[n];
4296		int i = 0;
4297	<	Iterator<?> it = iterator();
4057	<	while (it.hasNext()) {
4297	>	for (E e : this) {
4298		if (i == n) {
4299		if (n >= MAX_ARRAY_SIZE)
4300		throw new OutOfMemoryError(oomeMsg);
#	Line 4064 | Line 4304 | public class ConcurrentHashMapV8<K, V>
4304		n += (n >>> 1) + 1;
4305		r = Arrays.copyOf(r, n);
4306		}
4307	<	r[i++] = it.next();
4307	>	r[i++] = e;
4308		}
4309		return (i == n) ? r : Arrays.copyOf(r, i);
4310		}
4311
4312	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4312	>	@SuppressWarnings("unchecked")
4313	>	public final <T> T[] toArray(T[] a) {
4314		long sz = map.mappingCount();
4315	<	if (sz > (long)(MAX_ARRAY_SIZE))
4315	>	if (sz > MAX_ARRAY_SIZE)
4316		throw new OutOfMemoryError(oomeMsg);
4317		int m = (int)sz;
4318		T[] r = (a.length >= m) ? a :
#	Line 4079 | Line 4320 | public class ConcurrentHashMapV8<K, V>
4320		.newInstance(a.getClass().getComponentType(), m);
4321		int n = r.length;
4322		int i = 0;
4323	<	Iterator<?> it = iterator();
4083	<	while (it.hasNext()) {
4323	>	for (E e : this) {
4324		if (i == n) {
4325		if (n >= MAX_ARRAY_SIZE)
4326		throw new OutOfMemoryError(oomeMsg);
#	Line 4090 | Line 4330 | public class ConcurrentHashMapV8<K, V>
4330		n += (n >>> 1) + 1;
4331		r = Arrays.copyOf(r, n);
4332		}
4333	<	r[i++] = (T)it.next();
4333	>	r[i++] = (T)e;
4334		}
4335		if (a == r && i < n) {
4336		r[i] = null; // null-terminate
#	Line 4099 | Line 4339 | public class ConcurrentHashMapV8<K, V>
4339		return (i == n) ? r : Arrays.copyOf(r, i);
4340		}
4341
4342	<	public final int hashCode() {
4343	<	int h = 0;
4344	<	for (Iterator<?> it = iterator(); it.hasNext();)
4345	<	h += it.next().hashCode();
4346	<	return h;
4347	<	}
4348	<
4342	>	/**
4343	>	* Returns a string representation of this collection.
4344	>	* The string representation consists of the string representations
4345	>	* of the collection's elements in the order they are returned by
4346	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4347	>	* Adjacent elements are separated by the characters {@code ", "}
4348	>	* (comma and space).  Elements are converted to strings as by
4349	>	* {@link String#valueOf(Object)}.
4350	>	*
4351	>	* @return a string representation of this collection
4352	>	*/
4353		public final String toString() {
4354		StringBuilder sb = new StringBuilder();
4355		sb.append('[');
4356	<	Iterator<?> it = iterator();
4356	>	Iterator<E> it = iterator();
4357		if (it.hasNext()) {
4358		for (;;) {
4359		Object e = it.next();
#	Line 4124 | Line 4368 | public class ConcurrentHashMapV8<K, V>
4368
4369		public final boolean containsAll(Collection<?> c) {
4370		if (c != this) {
4371	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
4128	<	Object e = it.next();
4371	>	for (Object e : c) {
4372		if (e == null || !contains(e))
4373		return false;
4374		}
#	Line 4135 | Line 4378 | public class ConcurrentHashMapV8<K, V>
4378
4379		public final boolean removeAll(Collection<?> c) {
4380		boolean modified = false;
4381	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4381	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4382		if (c.contains(it.next())) {
4383		it.remove();
4384		modified = true;
#	Line 4146 | Line 4389 | public class ConcurrentHashMapV8<K, V>
4389
4390		public final boolean retainAll(Collection<?> c) {
4391		boolean modified = false;
4392	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4392	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4393		if (!c.contains(it.next())) {
4394		it.remove();
4395		modified = true;
#	Line 4160 | Line 4403 | public class ConcurrentHashMapV8<K, V>
4403		/**
4404		* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4405		* which additions may optionally be enabled by mapping to a
4406	<	* common value.  This class cannot be directly instantiated. See
4407	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4408	<	* {@link #newKeySet(int)}.
4406	>	* common value.  This class cannot be directly instantiated.
4407	>	* See {@link #keySet() keySet()},
4408	>	* {@link #keySet(Object) keySet(V)},
4409	>	* {@link #newKeySet() newKeySet()},
4410	>	* {@link #newKeySet(int) newKeySet(int)}.
4411	>	*
4412	>	* @since 1.8
4413		*/
4414	<	public static class KeySetView<K,V> extends CHMView<K,V> implements Set<K>, java.io.Serializable {
4414	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4415	>	implements Set<K>, java.io.Serializable {
4416		private static final long serialVersionUID = 7249069246763182397L;
4417		private final V value;
4418	<	KeySetView(ConcurrentHashMapV8<K, V> map, V value) {  // non-public
4418	>	KeySetView(ConcurrentHashMapV8<K,V> map, V value) {  // non-public
4419		super(map);
4420		this.value = value;
4421		}
#	Line 4177 | Line 4425 | public class ConcurrentHashMapV8<K, V>
4425		* or {@code null} if additions are not supported.
4426		*
4427		* @return the default mapped value for additions, or {@code null}
4428	<	* if not supported.
4428	>	* if not supported
4429		*/
4430		public V getMappedValue() { return value; }
4431
4432	<	// implement Set API
4433	<
4432	>	/**
4433	>	* {@inheritDoc}
4434	>	* @throws NullPointerException if the specified key is null
4435	>	*/
4436		public boolean contains(Object o) { return map.containsKey(o); }
4187	–	public boolean remove(Object o)   { return map.remove(o) != null; }
4437
4438		/**
4439	<	* Returns a "weakly consistent" iterator that will never
4440	<	* throw {@link ConcurrentModificationException}, and
4441	<	* guarantees to traverse elements as they existed upon
4193	<	* construction of the iterator, and may (but is not
4194	<	* guaranteed to) reflect any modifications subsequent to
4195	<	* construction.
4439	>	* Removes the key from this map view, by removing the key (and its
4440	>	* corresponding value) from the backing map.  This method does
4441	>	* nothing if the key is not in the map.
4442		*
4443	<	* @return an iterator over the keys of this map
4443	>	* @param  o the key to be removed from the backing map
4444	>	* @return {@code true} if the backing map contained the specified key
4445	>	* @throws NullPointerException if the specified key is null
4446	>	*/
4447	>	public boolean remove(Object o) { return map.remove(o) != null; }
4448	>
4449	>	/**
4450	>	* @return an iterator over the keys of the backing map
4451	>	*/
4452	>	public Iterator<K> iterator() {
4453	>	Node<K,V>[] t;
4454	>	ConcurrentHashMapV8<K,V> m = map;
4455	>	int f = (t = m.table) == null ? 0 : t.length;
4456	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4457	>	}
4458	>
4459	>	/**
4460	>	* Adds the specified key to this set view by mapping the key to
4461	>	* the default mapped value in the backing map, if defined.
4462	>	*
4463	>	* @param e key to be added
4464	>	* @return {@code true} if this set changed as a result of the call
4465	>	* @throws NullPointerException if the specified key is null
4466	>	* @throws UnsupportedOperationException if no default mapped value
4467	>	* for additions was provided
4468		*/
4199	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4469		public boolean add(K e) {
4470		V v;
4471		if ((v = value) == null)
4472		throw new UnsupportedOperationException();
4473	<	if (e == null)
4205	<	throw new NullPointerException();
4206	<	return map.internalPutIfAbsent(e, v) == null;
4473	>	return map.putVal(e, v, true) == null;
4474		}
4475	+
4476	+	/**
4477	+	* Adds all of the elements in the specified collection to this set,
4478	+	* as if by calling {@link #add} on each one.
4479	+	*
4480	+	* @param c the elements to be inserted into this set
4481	+	* @return {@code true} if this set changed as a result of the call
4482	+	* @throws NullPointerException if the collection or any of its
4483	+	* elements are {@code null}
4484	+	* @throws UnsupportedOperationException if no default mapped value
4485	+	* for additions was provided
4486	+	*/
4487		public boolean addAll(Collection<? extends K> c) {
4488		boolean added = false;
4489		V v;
4490		if ((v = value) == null)
4491		throw new UnsupportedOperationException();
4492		for (K e : c) {
4493	<	if (e == null)
4215	<	throw new NullPointerException();
4216	<	if (map.internalPutIfAbsent(e, v) == null)
4493	>	if (map.putVal(e, v, true) == null)
4494		added = true;
4495		}
4496		return added;
4497		}
4498	+
4499	+	public int hashCode() {
4500	+	int h = 0;
4501	+	for (K e : this)
4502	+	h += e.hashCode();
4503	+	return h;
4504	+	}
4505	+
4506		public boolean equals(Object o) {
4507		Set<?> c;
4508		return ((o instanceof Set) &&
#	Line 4225 | Line 4510 | public class ConcurrentHashMapV8<K, V>
4510		(containsAll(c) && c.containsAll(this))));
4511		}
4512
4513	<	/**
4514	<	* Performs the given action for each key.
4515	<	*
4516	<	* @param action the action
4517	<	*/
4518	<	public void forEach(Action<K> action) {
4234	<	ForkJoinTasks.forEachKey
4235	<	(map, action).invoke();
4513	>	public ConcurrentHashMapSpliterator<K> spliterator() {
4514	>	Node<K,V>[] t;
4515	>	ConcurrentHashMapV8<K,V> m = map;
4516	>	long n = m.sumCount();
4517	>	int f = (t = m.table) == null ? 0 : t.length;
4518	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4519		}
4520
4521	<	/**
4522	<	* Performs the given action for each non-null transformation
4523	<	* of each key.
4524	<	*
4525	<	* @param transformer a function returning the transformation
4526	<	* for an element, or null of there is no transformation (in
4527	<	* which case the action is not applied).
4528	<	* @param action the action
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();
4320	<	}
4321	<
4322	<	/**
4323	<	* Returns the result of accumulating the given transformation
4324	<	* of all keys using the given reducer to combine values, and
4325	<	* the given basis as an identity value.
4326	<	*
4327	<	* @param transformer a function returning the transformation
4328	<	* for an element
4329	<	* @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();
4521	>	public void forEach(Action<? super K> action) {
4522	>	if (action == null) throw new NullPointerException();
4523	>	Node<K,V>[] t;
4524	>	if ((t = map.table) != null) {
4525	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4526	>	for (Node<K,V> p; (p = it.advance()) != null; )
4527	>	action.apply(p.key);
4528	>	}
4529		}
4340	–
4530		}
4531
4532		/**
4533		* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4534		* values, in which additions are disabled. This class cannot be
4535	<	* 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.
4535	>	* directly instantiated. See {@link #values()}.
4536		*/
4537	<	public static final class ValuesView<K,V> extends CHMView<K,V>
4538	<	implements Collection<V> {
4539	<	ValuesView(ConcurrentHashMapV8<K, V> map)   { super(map); }
4540	<	public final boolean contains(Object o) { return map.containsValue(o); }
4537	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4538	>	implements Collection<V>, java.io.Serializable {
4539	>	private static final long serialVersionUID = 2249069246763182397L;
4540	>	ValuesView(ConcurrentHashMapV8<K,V> map) { super(map); }
4541	>	public final boolean contains(Object o) {
4542	>	return map.containsValue(o);
4543	>	}
4544	>
4545		public final boolean remove(Object o) {
4546		if (o != null) {
4547	<	Iterator<V> it = new ValueIterator<K,V>(map);
4361	<	while (it.hasNext()) {
4547	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4548		if (o.equals(it.next())) {
4549		it.remove();
4550		return true;
#	Line 4368 | Line 4554 | public class ConcurrentHashMapV8<K, V>
4554		return false;
4555		}
4556
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	–	*/
4557		public final Iterator<V> iterator() {
4558	<	return new ValueIterator<K,V>(map);
4558	>	ConcurrentHashMapV8<K,V> m = map;
4559	>	Node<K,V>[] t;
4560	>	int f = (t = m.table) == null ? 0 : t.length;
4561	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4562		}
4563	+
4564		public final boolean add(V e) {
4565		throw new UnsupportedOperationException();
4566		}
#	Line 4388 | Line 4568 | public class ConcurrentHashMapV8<K, V>
4568		throw new UnsupportedOperationException();
4569		}
4570
4571	<	/**
4572	<	* Performs the given action for each value.
4573	<	*
4574	<	* @param action the action
4575	<	*/
4576	<	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();
4413	<	}
4414	<
4415	<	/**
4416	<	* Returns a non-null result from applying the given search
4417	<	* function on each value, or null if none.  Upon success,
4418	<	* further element processing is suppressed and the results of
4419	<	* any other parallel invocations of the search function are
4420	<	* ignored.
4421	<	*
4422	<	* @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();
4571	>	public ConcurrentHashMapSpliterator<V> spliterator() {
4572	>	Node<K,V>[] t;
4573	>	ConcurrentHashMapV8<K,V> m = map;
4574	>	long n = m.sumCount();
4575	>	int f = (t = m.table) == null ? 0 : t.length;
4576	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4577		}
4578
4579	<	/**
4580	<	* Returns the result of accumulating the given transformation
4581	<	* of all values using the given reducer to combine values,
4582	<	* and the given basis as an identity value.
4583	<	*
4584	<	* @param transformer a function returning the transformation
4585	<	* for an element
4586	<	* @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();
4579	>	public void forEach(Action<? super V> action) {
4580	>	if (action == null) throw new NullPointerException();
4581	>	Node<K,V>[] t;
4582	>	if ((t = map.table) != null) {
4583	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4584	>	for (Node<K,V> p; (p = it.advance()) != null; )
4585	>	action.apply(p.val);
4586	>	}
4587		}
4519	–
4588		}
4589
4590		/**
4591		* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4592		* entries.  This class cannot be directly instantiated. See
4593	<	* {@link #entrySet}.
4593	>	* {@link #entrySet()}.
4594		*/
4595	<	public static final class EntrySetView<K,V> extends CHMView<K,V>
4596	<	implements Set<Map.Entry<K,V>> {
4597	<	EntrySetView(ConcurrentHashMapV8<K, V> map) { super(map); }
4598	<	public final boolean contains(Object o) {
4595	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4596	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4597	>	private static final long serialVersionUID = 2249069246763182397L;
4598	>	EntrySetView(ConcurrentHashMapV8<K,V> map) { super(map); }
4599	>
4600	>	public boolean contains(Object o) {
4601		Object k, v, r; Map.Entry<?,?> e;
4602		return ((o instanceof Map.Entry) &&
4603		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4535 | Line 4605 | public class ConcurrentHashMapV8<K, V>
4605		(v = e.getValue()) != null &&
4606		(v == r || v.equals(r)));
4607		}
4608	<	public final boolean remove(Object o) {
4608	>
4609	>	public boolean remove(Object o) {
4610		Object k, v; Map.Entry<?,?> e;
4611		return ((o instanceof Map.Entry) &&
4612		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 4544 | Line 4615 | public class ConcurrentHashMapV8<K, V>
4615		}
4616
4617		/**
4618	<	* 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
4618	>	* @return an iterator over the entries of the backing map
4619		*/
4620	<	public final Iterator<Map.Entry<K,V>> iterator() {
4621	<	return new EntryIterator<K,V>(map);
4620	>	public Iterator<Map.Entry<K,V>> iterator() {
4621	>	ConcurrentHashMapV8<K,V> m = map;
4622	>	Node<K,V>[] t;
4623	>	int f = (t = m.table) == null ? 0 : t.length;
4624	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4625		}
4626
4627	<	public final boolean add(Entry<K,V> e) {
4628	<	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;
4627	>	public boolean add(Entry<K,V> e) {
4628	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4629		}
4630	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4630	>
4631	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4632		boolean added = false;
4633		for (Entry<K,V> e : c) {
4634		if (add(e))
#	Line 4572 | Line 4636 | public class ConcurrentHashMapV8<K, V>
4636		}
4637		return added;
4638		}
4639	<	public boolean equals(Object o) {
4639	>
4640	>	public final int hashCode() {
4641	>	int h = 0;
4642	>	Node<K,V>[] t;
4643	>	if ((t = map.table) != null) {
4644	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4645	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4646	>	h += p.hashCode();
4647	>	}
4648	>	}
4649	>	return h;
4650	>	}
4651	>
4652	>	public final boolean equals(Object o) {
4653		Set<?> c;
4654		return ((o instanceof Set) &&
4655		((c = (Set<?>)o) == this ||
4656		(containsAll(c) && c.containsAll(this))));
4657		}
4658
4659	<	/**
4660	<	* Performs the given action for each entry.
4661	<	*
4662	<	* @param action the action
4663	<	*/
4664	<	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();
4622	<	}
4623	<
4624	<	/**
4625	<	* Returns the result of accumulating all entries using the
4626	<	* given reducer to combine values, or null if none.
4627	<	*
4628	<	* @param reducer a commutative associative combining function
4629	<	* @return the result of accumulating all entries
4630	<	*/
4631	<	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();
4659	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> spliterator() {
4660	>	Node<K,V>[] t;
4661	>	ConcurrentHashMapV8<K,V> m = map;
4662	>	long n = m.sumCount();
4663	>	int f = (t = m.table) == null ? 0 : t.length;
4664	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4665		}
4666
4667	<	/**
4668	<	* Returns the result of accumulating the given transformation
4669	<	* of all entries using the given reducer to combine values,
4670	<	* and the given basis as an identity value.
4671	<	*
4672	<	* @param transformer a function returning the transformation
4673	<	* for an element
4674	<	* @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();
4667	>	public void forEach(Action<? super Map.Entry<K,V>> action) {
4668	>	if (action == null) throw new NullPointerException();
4669	>	Node<K,V>[] t;
4670	>	if ((t = map.table) != null) {
4671	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4672	>	for (Node<K,V> p; (p = it.advance()) != null; )
4673	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
4674	>	}
4675		}
4676
4677		}
4678
4679	<	// ---------------------------------------------------------------------
4679	>	// -------------------------------------------------------
4680
4681		/**
4682	<	* Predefined tasks for performing bulk parallel operations on
4683	<	* 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.
4682	>	* Base class for bulk tasks. Repeats some fields and code from
4683	>	* class Traverser, because we need to subclass CountedCompleter.
4684		*/
4685	<	public static class ForkJoinTasks {
4686	<	private ForkJoinTasks() {}
4687	<
4688	<	/**
4689	<	* Returns a task that when invoked, performs the given
4690	<	* action for each (key, value)
4691	<	*
4692	<	* @param map the map
4693	<	* @param action the action
4694	<	* @return the task
4695	<	*/
4696	<	public static <K,V> ForkJoinTask<Void> forEach
4697	<	(ConcurrentHashMapV8<K,V> map,
4698	<	BiAction<K,V> action) {
4699	<	if (action == null) throw new NullPointerException();
4700	<	return new ForEachMappingTask<K,V>(map, null, -1, action);
4701	<	}
4702	<
4703	<	/**
4704	<	* Returns a task that when invoked, performs the given
4705	<	* 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);
4685	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4686	>	Node<K,V>[] tab;        // same as Traverser
4687	>	Node<K,V> next;
4688	>	int index;
4689	>	int baseIndex;
4690	>	int baseLimit;
4691	>	final int baseSize;
4692	>	int batch;              // split control
4693	>
4694	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4695	>	super(par);
4696	>	this.batch = b;
4697	>	this.index = this.baseIndex = i;
4698	>	if ((this.tab = t) == null)
4699	>	this.baseSize = this.baseLimit = 0;
4700	>	else if (par == null)
4701	>	this.baseSize = this.baseLimit = t.length;
4702	>	else {
4703	>	this.baseLimit = f;
4704	>	this.baseSize = par.baseSize;
4705	>	}
4706		}
4707
4708		/**
4709	<	* 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
4709	>	* Same as Traverser version
4710		*/
4711	<	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
4712	<	(ConcurrentHashMapV8<K,V> map,
4713	<	ObjectToInt<Map.Entry<K,V>> transformer,
4714	<	int basis,
4715	<	IntByIntToInt reducer) {
4716	<	if (transformer == null || reducer == null)
4717	<	throw new NullPointerException();
4718	<	return new MapReduceEntriesToIntTask<K,V>
4719	<	(map, null, -1, null, transformer, basis, reducer);
4711	>	final Node<K,V> advance() {
4712	>	Node<K,V> e;
4713	>	if ((e = next) != null)
4714	>	e = e.next;
4715	>	for (;;) {
4716	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4717	>	if (e != null)
4718	>	return next = e;
4719	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4720	>	(n = t.length) <= (i = index) || i < 0)
4721	>	return next = null;
4722	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4723	>	if (e instanceof ForwardingNode) {
4724	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4725	>	e = null;
4726	>	continue;
4727	>	}
4728	>	else if (e instanceof TreeBin)
4729	>	e = ((TreeBin<K,V>)e).first;
4730	>	else
4731	>	e = null;
4732	>	}
4733	>	if ((index += baseSize) >= n)
4734	>	index = ++baseIndex;    // visit upper slots if present
4735	>	}
4736		}
4737		}
4738
5378	–	// -------------------------------------------------------
5379	–
4739		/*
4740		* Task classes. Coded in a regular but ugly format/style to
4741		* simplify checks that each variant differs in the right way from
4742	<	* others.
4743	<	*/
4744	<
4745	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4746	<	extends Traverser<K,V,Void> {
4747	<	final Action<K> action;
4742	>	* others. The null screenings exist because compilers cannot tell
4743	>	* that we've already null-checked task arguments, so we force
4744	>	* simplest hoisted bypass to help avoid convoluted traps.
4745	>	*/
4746	>	@SuppressWarnings("serial")
4747	>	static final class ForEachKeyTask<K,V>
4748	>	extends BulkTask<K,V,Void> {
4749	>	final Action<? super K> action;
4750		ForEachKeyTask
4751	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4752	<	Action<K> action) {
4753	<	super(m, p, b);
4751	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4752	>	Action<? super K> action) {
4753	>	super(p, b, i, f, t);
4754		this.action = action;
4755		}
4756	<	@SuppressWarnings("unchecked") public final void compute() {
4757	<	final Action<K> action;
4758	<	if ((action = this.action) == null)
4759	<	throw new NullPointerException();
4760	<	for (int b; (b = preSplit()) > 0;)
4761	<	new ForEachKeyTask<K,V>(map, this, b, action).fork();
4762	<	while (advance() != null)
4763	<	action.apply((K)nextKey);
4764	<	propagateCompletion();
4756	>	public final void compute() {
4757	>	final Action<? super K> action;
4758	>	if ((action = this.action) != null) {
4759	>	for (int i = baseIndex, f, h; batch > 0 &&
4760	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4761	>	addToPendingCount(1);
4762	>	new ForEachKeyTask<K,V>
4763	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4764	>	action).fork();
4765	>	}
4766	>	for (Node<K,V> p; (p = advance()) != null;)
4767	>	action.apply(p.key);
4768	>	propagateCompletion();
4769	>	}
4770		}
4771		}
4772
4773	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4774	<	extends Traverser<K,V,Void> {
4775	<	final Action<V> action;
4773	>	@SuppressWarnings("serial")
4774	>	static final class ForEachValueTask<K,V>
4775	>	extends BulkTask<K,V,Void> {
4776	>	final Action<? super V> action;
4777		ForEachValueTask
4778	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4779	<	Action<V> action) {
4780	<	super(m, p, b);
4778	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4779	>	Action<? super V> action) {
4780	>	super(p, b, i, f, t);
4781		this.action = action;
4782		}
4783	<	@SuppressWarnings("unchecked") public final void compute() {
4784	<	final Action<V> action;
4785	<	if ((action = this.action) == null)
4786	<	throw new NullPointerException();
4787	<	for (int b; (b = preSplit()) > 0;)
4788	<	new ForEachValueTask<K,V>(map, this, b, action).fork();
4789	<	Object v;
4790	<	while ((v = advance()) != null)
4791	<	action.apply((V)v);
4792	<	propagateCompletion();
4783	>	public final void compute() {
4784	>	final Action<? super V> action;
4785	>	if ((action = this.action) != null) {
4786	>	for (int i = baseIndex, f, h; batch > 0 &&
4787	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4788	>	addToPendingCount(1);
4789	>	new ForEachValueTask<K,V>
4790	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4791	>	action).fork();
4792	>	}
4793	>	for (Node<K,V> p; (p = advance()) != null;)
4794	>	action.apply(p.val);
4795	>	propagateCompletion();
4796	>	}
4797		}
4798		}
4799
4800	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4801	<	extends Traverser<K,V,Void> {
4802	<	final Action<Entry<K,V>> action;
4800	>	@SuppressWarnings("serial")
4801	>	static final class ForEachEntryTask<K,V>
4802	>	extends BulkTask<K,V,Void> {
4803	>	final Action<? super Entry<K,V>> action;
4804		ForEachEntryTask
4805	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4806	<	Action<Entry<K,V>> action) {
4807	<	super(m, p, b);
4805	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4806	>	Action<? super Entry<K,V>> action) {
4807	>	super(p, b, i, f, t);
4808		this.action = action;
4809		}
4810	<	@SuppressWarnings("unchecked") public final void compute() {
4811	<	final Action<Entry<K,V>> action;
4812	<	if ((action = this.action) == null)
4813	<	throw new NullPointerException();
4814	<	for (int b; (b = preSplit()) > 0;)
4815	<	new ForEachEntryTask<K,V>(map, this, b, action).fork();
4816	<	Object v;
4817	<	while ((v = advance()) != null)
4818	<	action.apply(entryFor((K)nextKey, (V)v));
4819	<	propagateCompletion();
4810	>	public final void compute() {
4811	>	final Action<? super Entry<K,V>> action;
4812	>	if ((action = this.action) != null) {
4813	>	for (int i = baseIndex, f, h; batch > 0 &&
4814	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4815	>	addToPendingCount(1);
4816	>	new ForEachEntryTask<K,V>
4817	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4818	>	action).fork();
4819	>	}
4820	>	for (Node<K,V> p; (p = advance()) != null; )
4821	>	action.apply(p);
4822	>	propagateCompletion();
4823	>	}
4824		}
4825		}
4826
4827	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4828	<	extends Traverser<K,V,Void> {
4829	<	final BiAction<K,V> action;
4827	>	@SuppressWarnings("serial")
4828	>	static final class ForEachMappingTask<K,V>
4829	>	extends BulkTask<K,V,Void> {
4830	>	final BiAction<? super K, ? super V> action;
4831		ForEachMappingTask
4832	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4833	<	BiAction<K,V> action) {
4834	<	super(m, p, b);
4832	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4833	>	BiAction<? super K,? super V> action) {
4834	>	super(p, b, i, f, t);
4835		this.action = action;
4836		}
4837	<	@SuppressWarnings("unchecked") public final void compute() {
4838	<	final BiAction<K,V> action;
4839	<	if ((action = this.action) == null)
4840	<	throw new NullPointerException();
4841	<	for (int b; (b = preSplit()) > 0;)
4842	<	new ForEachMappingTask<K,V>(map, this, b, action).fork();
4843	<	Object v;
4844	<	while ((v = advance()) != null)
4845	<	action.apply((K)nextKey, (V)v);
4846	<	propagateCompletion();
4837	>	public final void compute() {
4838	>	final BiAction<? super K, ? super V> action;
4839	>	if ((action = this.action) != null) {
4840	>	for (int i = baseIndex, f, h; batch > 0 &&
4841	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4842	>	addToPendingCount(1);
4843	>	new ForEachMappingTask<K,V>
4844	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4845	>	action).fork();
4846	>	}
4847	>	for (Node<K,V> p; (p = advance()) != null; )
4848	>	action.apply(p.key, p.val);
4849	>	propagateCompletion();
4850	>	}
4851		}
4852		}
4853
4854	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4855	<	extends Traverser<K,V,Void> {
4854	>	@SuppressWarnings("serial")
4855	>	static final class ForEachTransformedKeyTask<K,V,U>
4856	>	extends BulkTask<K,V,Void> {
4857		final Fun<? super K, ? extends U> transformer;
4858	<	final Action<U> action;
4858	>	final Action<? super U> action;
4859		ForEachTransformedKeyTask
4860	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4861	<	Fun<? super K, ? extends U> transformer, Action<U> action) {
4862	<	super(m, p, b);
4860	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4861	>	Fun<? super K, ? extends U> transformer, Action<? super U> action) {
4862	>	super(p, b, i, f, t);
4863		this.transformer = transformer; this.action = action;
4864		}
4865	<	@SuppressWarnings("unchecked") public final void compute() {
4865	>	public final void compute() {
4866		final Fun<? super K, ? extends U> transformer;
4867	<	final Action<U> action;
4868	<	if ((transformer = this.transformer) == null ||
4869	<	(action = this.action) == null)
4870	<	throw new NullPointerException();
4871	<	for (int b; (b = preSplit()) > 0;)
4872	<	new ForEachTransformedKeyTask<K,V,U>
4873	<	(map, this, b, transformer, action).fork();
4874	<	U u;
4875	<	while (advance() != null) {
4876	<	if ((u = transformer.apply((K)nextKey)) != null)
4877	<	action.apply(u);
4867	>	final Action<? super U> action;
4868	>	if ((transformer = this.transformer) != null &&
4869	>	(action = this.action) != null) {
4870	>	for (int i = baseIndex, f, h; batch > 0 &&
4871	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4872	>	addToPendingCount(1);
4873	>	new ForEachTransformedKeyTask<K,V,U>
4874	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4875	>	transformer, action).fork();
4876	>	}
4877	>	for (Node<K,V> p; (p = advance()) != null; ) {
4878	>	U u;
4879	>	if ((u = transformer.apply(p.key)) != null)
4880	>	action.apply(u);
4881	>	}
4882	>	propagateCompletion();
4883		}
5497	–	propagateCompletion();
4884		}
4885		}
4886
4887	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4888	<	extends Traverser<K,V,Void> {
4887	>	@SuppressWarnings("serial")
4888	>	static final class ForEachTransformedValueTask<K,V,U>
4889	>	extends BulkTask<K,V,Void> {
4890		final Fun<? super V, ? extends U> transformer;
4891	<	final Action<U> action;
4891	>	final Action<? super U> action;
4892		ForEachTransformedValueTask
4893	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4894	<	Fun<? super V, ? extends U> transformer, Action<U> action) {
4895	<	super(m, p, b);
4893	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4894	>	Fun<? super V, ? extends U> transformer, Action<? super U> action) {
4895	>	super(p, b, i, f, t);
4896		this.transformer = transformer; this.action = action;
4897		}
4898	<	@SuppressWarnings("unchecked") public final void compute() {
4898	>	public final void compute() {
4899		final Fun<? super V, ? extends U> transformer;
4900	<	final Action<U> action;
4901	<	if ((transformer = this.transformer) == null ||
4902	<	(action = this.action) == null)
4903	<	throw new NullPointerException();
4904	<	for (int b; (b = preSplit()) > 0;)
4905	<	new ForEachTransformedValueTask<K,V,U>
4906	<	(map, this, b, transformer, action).fork();
4907	<	Object v; U u;
4908	<	while ((v = advance()) != null) {
4909	<	if ((u = transformer.apply((V)v)) != null)
4910	<	action.apply(u);
4900	>	final Action<? super U> action;
4901	>	if ((transformer = this.transformer) != null &&
4902	>	(action = this.action) != null) {
4903	>	for (int i = baseIndex, f, h; batch > 0 &&
4904	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4905	>	addToPendingCount(1);
4906	>	new ForEachTransformedValueTask<K,V,U>
4907	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4908	>	transformer, action).fork();
4909	>	}
4910	>	for (Node<K,V> p; (p = advance()) != null; ) {
4911	>	U u;
4912	>	if ((u = transformer.apply(p.val)) != null)
4913	>	action.apply(u);
4914	>	}
4915	>	propagateCompletion();
4916		}
5525	–	propagateCompletion();
4917		}
4918		}
4919
4920	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4921	<	extends Traverser<K,V,Void> {
4920	>	@SuppressWarnings("serial")
4921	>	static final class ForEachTransformedEntryTask<K,V,U>
4922	>	extends BulkTask<K,V,Void> {
4923		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4924	<	final Action<U> action;
4924	>	final Action<? super U> action;
4925		ForEachTransformedEntryTask
4926	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4927	<	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<U> action) {
4928	<	super(m, p, b);
4926	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4927	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<? super U> action) {
4928	>	super(p, b, i, f, t);
4929		this.transformer = transformer; this.action = action;
4930		}
4931	<	@SuppressWarnings("unchecked") public final void compute() {
4931	>	public final void compute() {
4932		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4933	<	final Action<U> action;
4934	<	if ((transformer = this.transformer) == null ||
4935	<	(action = this.action) == null)
4936	<	throw new NullPointerException();
4937	<	for (int b; (b = preSplit()) > 0;)
4938	<	new ForEachTransformedEntryTask<K,V,U>
4939	<	(map, this, b, transformer, action).fork();
4940	<	Object v; U u;
4941	<	while ((v = advance()) != null) {
4942	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
4943	<	action.apply(u);
4933	>	final Action<? super U> action;
4934	>	if ((transformer = this.transformer) != null &&
4935	>	(action = this.action) != null) {
4936	>	for (int i = baseIndex, f, h; batch > 0 &&
4937	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4938	>	addToPendingCount(1);
4939	>	new ForEachTransformedEntryTask<K,V,U>
4940	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4941	>	transformer, action).fork();
4942	>	}
4943	>	for (Node<K,V> p; (p = advance()) != null; ) {
4944	>	U u;
4945	>	if ((u = transformer.apply(p)) != null)
4946	>	action.apply(u);
4947	>	}
4948	>	propagateCompletion();
4949		}
5553	–	propagateCompletion();
4950		}
4951		}
4952
4953	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4954	<	extends Traverser<K,V,Void> {
4953	>	@SuppressWarnings("serial")
4954	>	static final class ForEachTransformedMappingTask<K,V,U>
4955	>	extends BulkTask<K,V,Void> {
4956		final BiFun<? super K, ? super V, ? extends U> transformer;
4957	<	final Action<U> action;
4957	>	final Action<? super U> action;
4958		ForEachTransformedMappingTask
4959	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4959	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4960		BiFun<? super K, ? super V, ? extends U> transformer,
4961	<	Action<U> action) {
4962	<	super(m, p, b);
4961	>	Action<? super U> action) {
4962	>	super(p, b, i, f, t);
4963		this.transformer = transformer; this.action = action;
4964		}
4965	<	@SuppressWarnings("unchecked") public final void compute() {
4965	>	public final void compute() {
4966		final BiFun<? super K, ? super V, ? extends U> transformer;
4967	<	final Action<U> action;
4968	<	if ((transformer = this.transformer) == null ||
4969	<	(action = this.action) == null)
4970	<	throw new NullPointerException();
4971	<	for (int b; (b = preSplit()) > 0;)
4972	<	new ForEachTransformedMappingTask<K,V,U>
4973	<	(map, this, b, transformer, action).fork();
4974	<	Object v; U u;
4975	<	while ((v = advance()) != null) {
4976	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
4977	<	action.apply(u);
4967	>	final Action<? super U> action;
4968	>	if ((transformer = this.transformer) != null &&
4969	>	(action = this.action) != null) {
4970	>	for (int i = baseIndex, f, h; batch > 0 &&
4971	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4972	>	addToPendingCount(1);
4973	>	new ForEachTransformedMappingTask<K,V,U>
4974	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4975	>	transformer, action).fork();
4976	>	}
4977	>	for (Node<K,V> p; (p = advance()) != null; ) {
4978	>	U u;
4979	>	if ((u = transformer.apply(p.key, p.val)) != null)
4980	>	action.apply(u);
4981	>	}
4982	>	propagateCompletion();
4983		}
5582	–	propagateCompletion();
4984		}
4985		}
4986
4987	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4988	<	extends Traverser<K,V,U> {
4987	>	@SuppressWarnings("serial")
4988	>	static final class SearchKeysTask<K,V,U>
4989	>	extends BulkTask<K,V,U> {
4990		final Fun<? super K, ? extends U> searchFunction;
4991		final AtomicReference<U> result;
4992		SearchKeysTask
4993	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
4993	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4994		Fun<? super K, ? extends U> searchFunction,
4995		AtomicReference<U> result) {
4996	<	super(m, p, b);
4996	>	super(p, b, i, f, t);
4997		this.searchFunction = searchFunction; this.result = result;
4998		}
4999		public final U getRawResult() { return result.get(); }
5000	<	@SuppressWarnings("unchecked") public final void compute() {
5000	>	public final void compute() {
5001		final Fun<? super K, ? extends U> searchFunction;
5002		final AtomicReference<U> result;
5003	<	if ((searchFunction = this.searchFunction) == null ||
5004	<	(result = this.result) == null)
5005	<	throw new NullPointerException();
5006	<	for (int b;;) {
5007	<	if (result.get() != null)
5008	<	return;
5009	<	if ((b = preSplit()) <= 0)
5010	<	break;
5011	<	new SearchKeysTask<K,V,U>
5012	<	(map, this, b, searchFunction, result).fork();
5013	<	}
5014	<	while (result.get() == null) {
5015	<	U u;
5016	<	if (advance() == null) {
5017	<	propagateCompletion();
5018	<	break;
5019	<	}
5020	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
5021	<	if (result.compareAndSet(null, u))
5022	<	quietlyCompleteRoot();
5023	<	break;
5003	>	if ((searchFunction = this.searchFunction) != null &&
5004	>	(result = this.result) != null) {
5005	>	for (int i = baseIndex, f, h; batch > 0 &&
5006	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5007	>	if (result.get() != null)
5008	>	return;
5009	>	addToPendingCount(1);
5010	>	new SearchKeysTask<K,V,U>
5011	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5012	>	searchFunction, result).fork();
5013	>	}
5014	>	while (result.get() == null) {
5015	>	U u;
5016	>	Node<K,V> p;
5017	>	if ((p = advance()) == null) {
5018	>	propagateCompletion();
5019	>	break;
5020	>	}
5021	>	if ((u = searchFunction.apply(p.key)) != null) {
5022	>	if (result.compareAndSet(null, u))
5023	>	quietlyCompleteRoot();
5024	>	break;
5025	>	}
5026		}
5027		}
5028		}
5029		}
5030
5031	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
5032	<	extends Traverser<K,V,U> {
5031	>	@SuppressWarnings("serial")
5032	>	static final class SearchValuesTask<K,V,U>
5033	>	extends BulkTask<K,V,U> {
5034		final Fun<? super V, ? extends U> searchFunction;
5035		final AtomicReference<U> result;
5036		SearchValuesTask
5037	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5037	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5038		Fun<? super V, ? extends U> searchFunction,
5039		AtomicReference<U> result) {
5040	<	super(m, p, b);
5040	>	super(p, b, i, f, t);
5041		this.searchFunction = searchFunction; this.result = result;
5042		}
5043		public final U getRawResult() { return result.get(); }
5044	<	@SuppressWarnings("unchecked") public final void compute() {
5044	>	public final void compute() {
5045		final Fun<? super V, ? extends U> searchFunction;
5046		final AtomicReference<U> result;
5047	<	if ((searchFunction = this.searchFunction) == null ||
5048	<	(result = this.result) == null)
5049	<	throw new NullPointerException();
5050	<	for (int b;;) {
5051	<	if (result.get() != null)
5052	<	return;
5053	<	if ((b = preSplit()) <= 0)
5054	<	break;
5055	<	new SearchValuesTask<K,V,U>
5056	<	(map, this, b, searchFunction, result).fork();
5057	<	}
5058	<	while (result.get() == null) {
5059	<	Object v; U u;
5060	<	if ((v = advance()) == null) {
5061	<	propagateCompletion();
5062	<	break;
5063	<	}
5064	<	if ((u = searchFunction.apply((V)v)) != null) {
5065	<	if (result.compareAndSet(null, u))
5066	<	quietlyCompleteRoot();
5067	<	break;
5047	>	if ((searchFunction = this.searchFunction) != null &&
5048	>	(result = this.result) != null) {
5049	>	for (int i = baseIndex, f, h; batch > 0 &&
5050	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5051	>	if (result.get() != null)
5052	>	return;
5053	>	addToPendingCount(1);
5054	>	new SearchValuesTask<K,V,U>
5055	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5056	>	searchFunction, result).fork();
5057	>	}
5058	>	while (result.get() == null) {
5059	>	U u;
5060	>	Node<K,V> p;
5061	>	if ((p = advance()) == null) {
5062	>	propagateCompletion();
5063	>	break;
5064	>	}
5065	>	if ((u = searchFunction.apply(p.val)) != null) {
5066	>	if (result.compareAndSet(null, u))
5067	>	quietlyCompleteRoot();
5068	>	break;
5069	>	}
5070		}
5071		}
5072		}
5073		}
5074
5075	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5076	<	extends Traverser<K,V,U> {
5075	>	@SuppressWarnings("serial")
5076	>	static final class SearchEntriesTask<K,V,U>
5077	>	extends BulkTask<K,V,U> {
5078		final Fun<Entry<K,V>, ? extends U> searchFunction;
5079		final AtomicReference<U> result;
5080		SearchEntriesTask
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		Fun<Entry<K,V>, ? extends U> searchFunction,
5083		AtomicReference<U> result) {
5084	<	super(m, p, b);
5084	>	super(p, b, i, f, t);
5085		this.searchFunction = searchFunction; this.result = result;
5086		}
5087		public final U getRawResult() { return result.get(); }
5088	<	@SuppressWarnings("unchecked") public final void compute() {
5088	>	public final void compute() {
5089		final Fun<Entry<K,V>, ? extends U> searchFunction;
5090		final AtomicReference<U> result;
5091	<	if ((searchFunction = this.searchFunction) == null ||
5092	<	(result = this.result) == null)
5093	<	throw new NullPointerException();
5094	<	for (int b;;) {
5095	<	if (result.get() != null)
5096	<	return;
5097	<	if ((b = preSplit()) <= 0)
5098	<	break;
5099	<	new SearchEntriesTask<K,V,U>
5100	<	(map, this, b, searchFunction, result).fork();
5101	<	}
5102	<	while (result.get() == null) {
5103	<	Object v; U u;
5104	<	if ((v = advance()) == null) {
5105	<	propagateCompletion();
5106	<	break;
5107	<	}
5108	<	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
5109	<	if (result.compareAndSet(null, u))
5110	<	quietlyCompleteRoot();
5111	<	return;
5091	>	if ((searchFunction = this.searchFunction) != null &&
5092	>	(result = this.result) != null) {
5093	>	for (int i = baseIndex, f, h; batch > 0 &&
5094	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5095	>	if (result.get() != null)
5096	>	return;
5097	>	addToPendingCount(1);
5098	>	new SearchEntriesTask<K,V,U>
5099	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5100	>	searchFunction, result).fork();
5101	>	}
5102	>	while (result.get() == null) {
5103	>	U u;
5104	>	Node<K,V> p;
5105	>	if ((p = advance()) == null) {
5106	>	propagateCompletion();
5107	>	break;
5108	>	}
5109	>	if ((u = searchFunction.apply(p)) != null) {
5110	>	if (result.compareAndSet(null, u))
5111	>	quietlyCompleteRoot();
5112	>	return;
5113	>	}
5114		}
5115		}
5116		}
5117		}
5118
5119	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5120	<	extends Traverser<K,V,U> {
5119	>	@SuppressWarnings("serial")
5120	>	static final class SearchMappingsTask<K,V,U>
5121	>	extends BulkTask<K,V,U> {
5122		final BiFun<? super K, ? super V, ? extends U> searchFunction;
5123		final AtomicReference<U> result;
5124		SearchMappingsTask
5125	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5125	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5126		BiFun<? super K, ? super V, ? extends U> searchFunction,
5127		AtomicReference<U> result) {
5128	<	super(m, p, b);
5128	>	super(p, b, i, f, t);
5129		this.searchFunction = searchFunction; this.result = result;
5130		}
5131		public final U getRawResult() { return result.get(); }
5132	<	@SuppressWarnings("unchecked") public final void compute() {
5132	>	public final void compute() {
5133		final BiFun<? super K, ? super V, ? extends U> searchFunction;
5134		final AtomicReference<U> result;
5135	<	if ((searchFunction = this.searchFunction) == null ||
5136	<	(result = this.result) == null)
5137	<	throw new NullPointerException();
5138	<	for (int b;;) {
5139	<	if (result.get() != null)
5140	<	return;
5141	<	if ((b = preSplit()) <= 0)
5142	<	break;
5143	<	new SearchMappingsTask<K,V,U>
5144	<	(map, this, b, searchFunction, result).fork();
5145	<	}
5146	<	while (result.get() == null) {
5147	<	Object v; U u;
5148	<	if ((v = advance()) == null) {
5149	<	propagateCompletion();
5150	<	break;
5151	<	}
5152	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5153	<	if (result.compareAndSet(null, u))
5154	<	quietlyCompleteRoot();
5155	<	break;
5135	>	if ((searchFunction = this.searchFunction) != null &&
5136	>	(result = this.result) != null) {
5137	>	for (int i = baseIndex, f, h; batch > 0 &&
5138	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5139	>	if (result.get() != null)
5140	>	return;
5141	>	addToPendingCount(1);
5142	>	new SearchMappingsTask<K,V,U>
5143	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5144	>	searchFunction, result).fork();
5145	>	}
5146	>	while (result.get() == null) {
5147	>	U u;
5148	>	Node<K,V> p;
5149	>	if ((p = advance()) == null) {
5150	>	propagateCompletion();
5151	>	break;
5152	>	}
5153	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5154	>	if (result.compareAndSet(null, u))
5155	>	quietlyCompleteRoot();
5156	>	break;
5157	>	}
5158		}
5159		}
5160		}
5161		}
5162
5163	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5164	<	extends Traverser<K,V,K> {
5163	>	@SuppressWarnings("serial")
5164	>	static final class ReduceKeysTask<K,V>
5165	>	extends BulkTask<K,V,K> {
5166		final BiFun<? super K, ? super K, ? extends K> reducer;
5167		K result;
5168		ReduceKeysTask<K,V> rights, nextRight;
5169		ReduceKeysTask
5170	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5170	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5171		ReduceKeysTask<K,V> nextRight,
5172		BiFun<? super K, ? super K, ? extends K> reducer) {
5173	<	super(m, p, b); this.nextRight = nextRight;
5173	>	super(p, b, i, f, t); this.nextRight = nextRight;
5174		this.reducer = reducer;
5175		}
5176		public final K getRawResult() { return result; }
5177	<	@SuppressWarnings("unchecked") public final void compute() {
5178	<	final BiFun<? super K, ? super K, ? extends K> reducer =
5179	<	this.reducer;
5180	<	if (reducer == null)
5181	<	throw new NullPointerException();
5182	<	for (int b; (b = preSplit()) > 0;)
5183	<	(rights = new ReduceKeysTask<K,V>
5184	<	(map, this, b, rights, reducer)).fork();
5185	<	K r = null;
5186	<	while (advance() != null) {
5187	<	K u = (K)nextKey;
5188	<	r = (r == null) ? u : reducer.apply(r, u);
5189	<	}
5190	<	result = r;
5191	<	CountedCompleter<?> c;
5192	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5193	<	ReduceKeysTask<K,V>
5194	<	t = (ReduceKeysTask<K,V>)c,
5195	<	s = t.rights;
5196	<	while (s != null) {
5197	<	K tr, sr;
5198	<	if ((sr = s.result) != null)
5199	<	t.result = (((tr = t.result) == null) ? sr :
5200	<	reducer.apply(tr, sr));
5201	<	s = t.rights = s.nextRight;
5177	>	public final void compute() {
5178	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5179	>	if ((reducer = this.reducer) != null) {
5180	>	for (int i = baseIndex, f, h; batch > 0 &&
5181	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5182	>	addToPendingCount(1);
5183	>	(rights = new ReduceKeysTask<K,V>
5184	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5185	>	rights, reducer)).fork();
5186	>	}
5187	>	K r = null;
5188	>	for (Node<K,V> p; (p = advance()) != null; ) {
5189	>	K u = p.key;
5190	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5191	>	}
5192	>	result = r;
5193	>	CountedCompleter<?> c;
5194	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5195	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5196	>	t = (ReduceKeysTask<K,V>)c,
5197	>	s = t.rights;
5198	>	while (s != null) {
5199	>	K tr, sr;
5200	>	if ((sr = s.result) != null)
5201	>	t.result = (((tr = t.result) == null) ? sr :
5202	>	reducer.apply(tr, sr));
5203	>	s = t.rights = s.nextRight;
5204	>	}
5205		}
5206		}
5207		}
5208		}
5209
5210	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5211	<	extends Traverser<K,V,V> {
5210	>	@SuppressWarnings("serial")
5211	>	static final class ReduceValuesTask<K,V>
5212	>	extends BulkTask<K,V,V> {
5213		final BiFun<? super V, ? super V, ? extends V> reducer;
5214		V result;
5215		ReduceValuesTask<K,V> rights, nextRight;
5216		ReduceValuesTask
5217	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5217	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5218		ReduceValuesTask<K,V> nextRight,
5219		BiFun<? super V, ? super V, ? extends V> reducer) {
5220	<	super(m, p, b); this.nextRight = nextRight;
5220	>	super(p, b, i, f, t); this.nextRight = nextRight;
5221		this.reducer = reducer;
5222		}
5223		public final V getRawResult() { return result; }
5224	<	@SuppressWarnings("unchecked") public final void compute() {
5225	<	final BiFun<? super V, ? super V, ? extends V> reducer =
5226	<	this.reducer;
5227	<	if (reducer == null)
5228	<	throw new NullPointerException();
5229	<	for (int b; (b = preSplit()) > 0;)
5230	<	(rights = new ReduceValuesTask<K,V>
5231	<	(map, this, b, rights, reducer)).fork();
5232	<	V r = null;
5233	<	Object v;
5234	<	while ((v = advance()) != null) {
5235	<	V u = (V)v;
5236	<	r = (r == null) ? u : reducer.apply(r, u);
5237	<	}
5238	<	result = r;
5239	<	CountedCompleter<?> c;
5240	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5241	<	ReduceValuesTask<K,V>
5242	<	t = (ReduceValuesTask<K,V>)c,
5243	<	s = t.rights;
5244	<	while (s != null) {
5245	<	V tr, sr;
5246	<	if ((sr = s.result) != null)
5247	<	t.result = (((tr = t.result) == null) ? sr :
5248	<	reducer.apply(tr, sr));
5249	<	s = t.rights = s.nextRight;
5224	>	public final void compute() {
5225	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5226	>	if ((reducer = this.reducer) != null) {
5227	>	for (int i = baseIndex, f, h; batch > 0 &&
5228	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5229	>	addToPendingCount(1);
5230	>	(rights = new ReduceValuesTask<K,V>
5231	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5232	>	rights, reducer)).fork();
5233	>	}
5234	>	V r = null;
5235	>	for (Node<K,V> p; (p = advance()) != null; ) {
5236	>	V v = p.val;
5237	>	r = (r == null) ? v : reducer.apply(r, v);
5238	>	}
5239	>	result = r;
5240	>	CountedCompleter<?> c;
5241	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5242	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5243	>	t = (ReduceValuesTask<K,V>)c,
5244	>	s = t.rights;
5245	>	while (s != null) {
5246	>	V tr, sr;
5247	>	if ((sr = s.result) != null)
5248	>	t.result = (((tr = t.result) == null) ? sr :
5249	>	reducer.apply(tr, sr));
5250	>	s = t.rights = s.nextRight;
5251	>	}
5252		}
5253		}
5254		}
5255		}
5256
5257	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5258	<	extends Traverser<K,V,Map.Entry<K,V>> {
5257	>	@SuppressWarnings("serial")
5258	>	static final class ReduceEntriesTask<K,V>
5259	>	extends BulkTask<K,V,Map.Entry<K,V>> {
5260		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5261		Map.Entry<K,V> result;
5262		ReduceEntriesTask<K,V> rights, nextRight;
5263		ReduceEntriesTask
5264	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5264	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5265		ReduceEntriesTask<K,V> nextRight,
5266		BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5267	<	super(m, p, b); this.nextRight = nextRight;
5267	>	super(p, b, i, f, t); this.nextRight = nextRight;
5268		this.reducer = reducer;
5269		}
5270		public final Map.Entry<K,V> getRawResult() { return result; }
5271	<	@SuppressWarnings("unchecked") public final void compute() {
5272	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5273	<	this.reducer;
5274	<	if (reducer == null)
5275	<	throw new NullPointerException();
5276	<	for (int b; (b = preSplit()) > 0;)
5277	<	(rights = new ReduceEntriesTask<K,V>
5278	<	(map, this, b, rights, reducer)).fork();
5279	<	Map.Entry<K,V> r = null;
5280	<	Object v;
5281	<	while ((v = advance()) != null) {
5282	<	Map.Entry<K,V> u = entryFor((K)nextKey, (V)v);
5283	<	r = (r == null) ? u : reducer.apply(r, u);
5284	<	}
5285	<	result = r;
5286	<	CountedCompleter<?> c;
5287	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5288	<	ReduceEntriesTask<K,V>
5289	<	t = (ReduceEntriesTask<K,V>)c,
5290	<	s = t.rights;
5291	<	while (s != null) {
5292	<	Map.Entry<K,V> tr, sr;
5293	<	if ((sr = s.result) != null)
5294	<	t.result = (((tr = t.result) == null) ? sr :
5295	<	reducer.apply(tr, sr));
5296	<	s = t.rights = s.nextRight;
5271	>	public final void compute() {
5272	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5273	>	if ((reducer = this.reducer) != null) {
5274	>	for (int i = baseIndex, f, h; batch > 0 &&
5275	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5276	>	addToPendingCount(1);
5277	>	(rights = new ReduceEntriesTask<K,V>
5278	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5279	>	rights, reducer)).fork();
5280	>	}
5281	>	Map.Entry<K,V> r = null;
5282	>	for (Node<K,V> p; (p = advance()) != null; )
5283	>	r = (r == null) ? p : reducer.apply(r, p);
5284	>	result = r;
5285	>	CountedCompleter<?> c;
5286	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5287	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5288	>	t = (ReduceEntriesTask<K,V>)c,
5289	>	s = t.rights;
5290	>	while (s != null) {
5291	>	Map.Entry<K,V> tr, sr;
5292	>	if ((sr = s.result) != null)
5293	>	t.result = (((tr = t.result) == null) ? sr :
5294	>	reducer.apply(tr, sr));
5295	>	s = t.rights = s.nextRight;
5296	>	}
5297		}
5298		}
5299		}
5300		}
5301
5302	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5303	<	extends Traverser<K,V,U> {
5302	>	@SuppressWarnings("serial")
5303	>	static final class MapReduceKeysTask<K,V,U>
5304	>	extends BulkTask<K,V,U> {
5305		final Fun<? super K, ? extends U> transformer;
5306		final BiFun<? super U, ? super U, ? extends U> reducer;
5307		U result;
5308		MapReduceKeysTask<K,V,U> rights, nextRight;
5309		MapReduceKeysTask
5310	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5310	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5311		MapReduceKeysTask<K,V,U> nextRight,
5312		Fun<? super K, ? extends U> transformer,
5313		BiFun<? super U, ? super U, ? extends U> reducer) {
5314	<	super(m, p, b); this.nextRight = nextRight;
5314	>	super(p, b, i, f, t); this.nextRight = nextRight;
5315		this.transformer = transformer;
5316		this.reducer = reducer;
5317		}
5318		public final U getRawResult() { return result; }
5319	<	@SuppressWarnings("unchecked") public final void compute() {
5320	<	final Fun<? super K, ? extends U> transformer =
5321	<	this.transformer;
5322	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5323	<	this.reducer;
5324	<	if (transformer == null || reducer == null)
5325	<	throw new NullPointerException();
5326	<	for (int b; (b = preSplit()) > 0;)
5327	<	(rights = new MapReduceKeysTask<K,V,U>
5328	<	(map, this, b, rights, transformer, reducer)).fork();
5329	<	U r = null, u;
5330	<	while (advance() != null) {
5331	<	if ((u = transformer.apply((K)nextKey)) != null)
5332	<	r = (r == null) ? u : reducer.apply(r, u);
5333	<	}
5334	<	result = r;
5335	<	CountedCompleter<?> c;
5336	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5337	<	MapReduceKeysTask<K,V,U>
5338	<	t = (MapReduceKeysTask<K,V,U>)c,
5339	<	s = t.rights;
5340	<	while (s != null) {
5341	<	U tr, sr;
5342	<	if ((sr = s.result) != null)
5343	<	t.result = (((tr = t.result) == null) ? sr :
5344	<	reducer.apply(tr, sr));
5345	<	s = t.rights = s.nextRight;
5319	>	public final void compute() {
5320	>	final Fun<? super K, ? extends U> transformer;
5321	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5322	>	if ((transformer = this.transformer) != null &&
5323	>	(reducer = this.reducer) != null) {
5324	>	for (int i = baseIndex, f, h; batch > 0 &&
5325	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5326	>	addToPendingCount(1);
5327	>	(rights = new MapReduceKeysTask<K,V,U>
5328	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5329	>	rights, transformer, reducer)).fork();
5330	>	}
5331	>	U r = null;
5332	>	for (Node<K,V> p; (p = advance()) != null; ) {
5333	>	U u;
5334	>	if ((u = transformer.apply(p.key)) != null)
5335	>	r = (r == null) ? u : reducer.apply(r, u);
5336	>	}
5337	>	result = r;
5338	>	CountedCompleter<?> c;
5339	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5340	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5341	>	t = (MapReduceKeysTask<K,V,U>)c,
5342	>	s = t.rights;
5343	>	while (s != null) {
5344	>	U tr, sr;
5345	>	if ((sr = s.result) != null)
5346	>	t.result = (((tr = t.result) == null) ? sr :
5347	>	reducer.apply(tr, sr));
5348	>	s = t.rights = s.nextRight;
5349	>	}
5350		}
5351		}
5352		}
5353		}
5354
5355	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5356	<	extends Traverser<K,V,U> {
5355	>	@SuppressWarnings("serial")
5356	>	static final class MapReduceValuesTask<K,V,U>
5357	>	extends BulkTask<K,V,U> {
5358		final Fun<? super V, ? extends U> transformer;
5359		final BiFun<? super U, ? super U, ? extends U> reducer;
5360		U result;
5361		MapReduceValuesTask<K,V,U> rights, nextRight;
5362		MapReduceValuesTask
5363	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5363	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5364		MapReduceValuesTask<K,V,U> nextRight,
5365		Fun<? super V, ? extends U> transformer,
5366		BiFun<? super U, ? super U, ? extends U> reducer) {
5367	<	super(m, p, b); this.nextRight = nextRight;
5367	>	super(p, b, i, f, t); this.nextRight = nextRight;
5368		this.transformer = transformer;
5369		this.reducer = reducer;
5370		}
5371		public final U getRawResult() { return result; }
5372	<	@SuppressWarnings("unchecked") public final void compute() {
5373	<	final Fun<? super V, ? extends U> transformer =
5374	<	this.transformer;
5375	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5376	<	this.reducer;
5377	<	if (transformer == null || reducer == null)
5378	<	throw new NullPointerException();
5379	<	for (int b; (b = preSplit()) > 0;)
5380	<	(rights = new MapReduceValuesTask<K,V,U>
5381	<	(map, this, b, rights, transformer, reducer)).fork();
5382	<	U r = null, u;
5383	<	Object v;
5384	<	while ((v = advance()) != null) {
5385	<	if ((u = transformer.apply((V)v)) != null)
5386	<	r = (r == null) ? u : reducer.apply(r, u);
5387	<	}
5388	<	result = r;
5389	<	CountedCompleter<?> c;
5390	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5391	<	MapReduceValuesTask<K,V,U>
5392	<	t = (MapReduceValuesTask<K,V,U>)c,
5393	<	s = t.rights;
5394	<	while (s != null) {
5395	<	U tr, sr;
5396	<	if ((sr = s.result) != null)
5397	<	t.result = (((tr = t.result) == null) ? sr :
5398	<	reducer.apply(tr, sr));
5399	<	s = t.rights = s.nextRight;
5372	>	public final void compute() {
5373	>	final Fun<? super V, ? extends U> transformer;
5374	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5375	>	if ((transformer = this.transformer) != null &&
5376	>	(reducer = this.reducer) != null) {
5377	>	for (int i = baseIndex, f, h; batch > 0 &&
5378	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5379	>	addToPendingCount(1);
5380	>	(rights = new MapReduceValuesTask<K,V,U>
5381	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5382	>	rights, transformer, reducer)).fork();
5383	>	}
5384	>	U r = null;
5385	>	for (Node<K,V> p; (p = advance()) != null; ) {
5386	>	U u;
5387	>	if ((u = transformer.apply(p.val)) != null)
5388	>	r = (r == null) ? u : reducer.apply(r, u);
5389	>	}
5390	>	result = r;
5391	>	CountedCompleter<?> c;
5392	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5393	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5394	>	t = (MapReduceValuesTask<K,V,U>)c,
5395	>	s = t.rights;
5396	>	while (s != null) {
5397	>	U tr, sr;
5398	>	if ((sr = s.result) != null)
5399	>	t.result = (((tr = t.result) == null) ? sr :
5400	>	reducer.apply(tr, sr));
5401	>	s = t.rights = s.nextRight;
5402	>	}
5403		}
5404		}
5405		}
5406		}
5407
5408	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5409	<	extends Traverser<K,V,U> {
5408	>	@SuppressWarnings("serial")
5409	>	static final class MapReduceEntriesTask<K,V,U>
5410	>	extends BulkTask<K,V,U> {
5411		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5412		final BiFun<? super U, ? super U, ? extends U> reducer;
5413		U result;
5414		MapReduceEntriesTask<K,V,U> rights, nextRight;
5415		MapReduceEntriesTask
5416	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5416	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5417		MapReduceEntriesTask<K,V,U> nextRight,
5418		Fun<Map.Entry<K,V>, ? extends U> transformer,
5419		BiFun<? super U, ? super U, ? extends U> reducer) {
5420	<	super(m, p, b); this.nextRight = nextRight;
5420	>	super(p, b, i, f, t); this.nextRight = nextRight;
5421		this.transformer = transformer;
5422		this.reducer = reducer;
5423		}
5424		public final U getRawResult() { return result; }
5425	<	@SuppressWarnings("unchecked") public final void compute() {
5426	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5427	<	this.transformer;
5428	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5429	<	this.reducer;
5430	<	if (transformer == null || reducer == null)
5431	<	throw new NullPointerException();
5432	<	for (int b; (b = preSplit()) > 0;)
5433	<	(rights = new MapReduceEntriesTask<K,V,U>
5434	<	(map, this, b, rights, transformer, reducer)).fork();
5435	<	U r = null, u;
5436	<	Object v;
5437	<	while ((v = advance()) != null) {
5438	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5439	<	r = (r == null) ? u : reducer.apply(r, u);
5440	<	}
5441	<	result = r;
5442	<	CountedCompleter<?> c;
5443	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5444	<	MapReduceEntriesTask<K,V,U>
5445	<	t = (MapReduceEntriesTask<K,V,U>)c,
5446	<	s = t.rights;
5447	<	while (s != null) {
5448	<	U tr, sr;
5449	<	if ((sr = s.result) != null)
5450	<	t.result = (((tr = t.result) == null) ? sr :
5451	<	reducer.apply(tr, sr));
5452	<	s = t.rights = s.nextRight;
5425	>	public final void compute() {
5426	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5427	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5428	>	if ((transformer = this.transformer) != null &&
5429	>	(reducer = this.reducer) != null) {
5430	>	for (int i = baseIndex, f, h; batch > 0 &&
5431	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5432	>	addToPendingCount(1);
5433	>	(rights = new MapReduceEntriesTask<K,V,U>
5434	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5435	>	rights, transformer, reducer)).fork();
5436	>	}
5437	>	U r = null;
5438	>	for (Node<K,V> p; (p = advance()) != null; ) {
5439	>	U u;
5440	>	if ((u = transformer.apply(p)) != null)
5441	>	r = (r == null) ? u : reducer.apply(r, u);
5442	>	}
5443	>	result = r;
5444	>	CountedCompleter<?> c;
5445	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5446	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5447	>	t = (MapReduceEntriesTask<K,V,U>)c,
5448	>	s = t.rights;
5449	>	while (s != null) {
5450	>	U tr, sr;
5451	>	if ((sr = s.result) != null)
5452	>	t.result = (((tr = t.result) == null) ? sr :
5453	>	reducer.apply(tr, sr));
5454	>	s = t.rights = s.nextRight;
5455	>	}
5456		}
5457		}
5458		}
5459		}
5460
5461	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5462	<	extends Traverser<K,V,U> {
5461	>	@SuppressWarnings("serial")
5462	>	static final class MapReduceMappingsTask<K,V,U>
5463	>	extends BulkTask<K,V,U> {
5464		final BiFun<? super K, ? super V, ? extends U> transformer;
5465		final BiFun<? super U, ? super U, ? extends U> reducer;
5466		U result;
5467		MapReduceMappingsTask<K,V,U> rights, nextRight;
5468		MapReduceMappingsTask
5469	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5469	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5470		MapReduceMappingsTask<K,V,U> nextRight,
5471		BiFun<? super K, ? super V, ? extends U> transformer,
5472		BiFun<? super U, ? super U, ? extends U> reducer) {
5473	<	super(m, p, b); this.nextRight = nextRight;
5473	>	super(p, b, i, f, t); this.nextRight = nextRight;
5474		this.transformer = transformer;
5475		this.reducer = reducer;
5476		}
5477		public final U getRawResult() { return result; }
5478	<	@SuppressWarnings("unchecked") public final void compute() {
5479	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5480	<	this.transformer;
5481	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5482	<	this.reducer;
5483	<	if (transformer == null || reducer == null)
5484	<	throw new NullPointerException();
5485	<	for (int b; (b = preSplit()) > 0;)
5486	<	(rights = new MapReduceMappingsTask<K,V,U>
5487	<	(map, this, b, rights, transformer, reducer)).fork();
5488	<	U r = null, u;
5489	<	Object v;
5490	<	while ((v = advance()) != null) {
5491	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5492	<	r = (r == null) ? u : reducer.apply(r, u);
5493	<	}
5494	<	result = r;
5495	<	CountedCompleter<?> c;
5496	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5497	<	MapReduceMappingsTask<K,V,U>
5498	<	t = (MapReduceMappingsTask<K,V,U>)c,
5499	<	s = t.rights;
5500	<	while (s != null) {
5501	<	U tr, sr;
5502	<	if ((sr = s.result) != null)
5503	<	t.result = (((tr = t.result) == null) ? sr :
5504	<	reducer.apply(tr, sr));
5505	<	s = t.rights = s.nextRight;
5478	>	public final void compute() {
5479	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5480	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5481	>	if ((transformer = this.transformer) != null &&
5482	>	(reducer = this.reducer) != null) {
5483	>	for (int i = baseIndex, f, h; batch > 0 &&
5484	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5485	>	addToPendingCount(1);
5486	>	(rights = new MapReduceMappingsTask<K,V,U>
5487	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5488	>	rights, transformer, reducer)).fork();
5489	>	}
5490	>	U r = null;
5491	>	for (Node<K,V> p; (p = advance()) != null; ) {
5492	>	U u;
5493	>	if ((u = transformer.apply(p.key, p.val)) != null)
5494	>	r = (r == null) ? u : reducer.apply(r, u);
5495	>	}
5496	>	result = r;
5497	>	CountedCompleter<?> c;
5498	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5499	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5500	>	t = (MapReduceMappingsTask<K,V,U>)c,
5501	>	s = t.rights;
5502	>	while (s != null) {
5503	>	U tr, sr;
5504	>	if ((sr = s.result) != null)
5505	>	t.result = (((tr = t.result) == null) ? sr :
5506	>	reducer.apply(tr, sr));
5507	>	s = t.rights = s.nextRight;
5508	>	}
5509		}
5510		}
5511		}
5512		}
5513
5514	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5515	<	extends Traverser<K,V,Double> {
5514	>	@SuppressWarnings("serial")
5515	>	static final class MapReduceKeysToDoubleTask<K,V>
5516	>	extends BulkTask<K,V,Double> {
5517		final ObjectToDouble<? super K> transformer;
5518		final DoubleByDoubleToDouble reducer;
5519		final double basis;
5520		double result;
5521		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5522		MapReduceKeysToDoubleTask
5523	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5523	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5524		MapReduceKeysToDoubleTask<K,V> nextRight,
5525		ObjectToDouble<? super K> transformer,
5526		double basis,
5527		DoubleByDoubleToDouble reducer) {
5528	<	super(m, p, b); this.nextRight = nextRight;
5528	>	super(p, b, i, f, t); this.nextRight = nextRight;
5529		this.transformer = transformer;
5530		this.basis = basis; this.reducer = reducer;
5531		}
5532		public final Double getRawResult() { return result; }
5533	<	@SuppressWarnings("unchecked") public final void compute() {
5534	<	final ObjectToDouble<? super K> transformer =
5535	<	this.transformer;
5536	<	final DoubleByDoubleToDouble reducer = this.reducer;
5537	<	if (transformer == null || reducer == null)
5538	<	throw new NullPointerException();
5539	<	double r = this.basis;
5540	<	for (int b; (b = preSplit()) > 0;)
5541	<	(rights = new MapReduceKeysToDoubleTask<K,V>
5542	<	(map, this, b, rights, transformer, r, reducer)).fork();
5543	<	while (advance() != null)
5544	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5545	<	result = r;
5546	<	CountedCompleter<?> c;
5547	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5548	<	MapReduceKeysToDoubleTask<K,V>
5549	<	t = (MapReduceKeysToDoubleTask<K,V>)c,
5550	<	s = t.rights;
5551	<	while (s != null) {
5552	<	t.result = reducer.apply(t.result, s.result);
5553	<	s = t.rights = s.nextRight;
5533	>	public final void compute() {
5534	>	final ObjectToDouble<? super K> transformer;
5535	>	final DoubleByDoubleToDouble reducer;
5536	>	if ((transformer = this.transformer) != null &&
5537	>	(reducer = this.reducer) != null) {
5538	>	double r = this.basis;
5539	>	for (int i = baseIndex, f, h; batch > 0 &&
5540	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5541	>	addToPendingCount(1);
5542	>	(rights = new MapReduceKeysToDoubleTask<K,V>
5543	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5544	>	rights, transformer, r, reducer)).fork();
5545	>	}
5546	>	for (Node<K,V> p; (p = advance()) != null; )
5547	>	r = reducer.apply(r, transformer.apply(p.key));
5548	>	result = r;
5549	>	CountedCompleter<?> c;
5550	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5551	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5552	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5553	>	s = t.rights;
5554	>	while (s != null) {
5555	>	t.result = reducer.apply(t.result, s.result);
5556	>	s = t.rights = s.nextRight;
5557	>	}
5558		}
5559		}
5560		}
5561		}
5562
5563	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5564	<	extends Traverser<K,V,Double> {
5563	>	@SuppressWarnings("serial")
5564	>	static final class MapReduceValuesToDoubleTask<K,V>
5565	>	extends BulkTask<K,V,Double> {
5566		final ObjectToDouble<? super V> transformer;
5567		final DoubleByDoubleToDouble reducer;
5568		final double basis;
5569		double result;
5570		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5571		MapReduceValuesToDoubleTask
5572	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5572	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5573		MapReduceValuesToDoubleTask<K,V> nextRight,
5574		ObjectToDouble<? super V> transformer,
5575		double basis,
5576		DoubleByDoubleToDouble reducer) {
5577	<	super(m, p, b); this.nextRight = nextRight;
5577	>	super(p, b, i, f, t); this.nextRight = nextRight;
5578		this.transformer = transformer;
5579		this.basis = basis; this.reducer = reducer;
5580		}
5581		public final Double getRawResult() { return result; }
5582	<	@SuppressWarnings("unchecked") public final void compute() {
5583	<	final ObjectToDouble<? super V> transformer =
5584	<	this.transformer;
5585	<	final DoubleByDoubleToDouble reducer = this.reducer;
5586	<	if (transformer == null || reducer == null)
5587	<	throw new NullPointerException();
5588	<	double r = this.basis;
5589	<	for (int b; (b = preSplit()) > 0;)
5590	<	(rights = new MapReduceValuesToDoubleTask<K,V>
5591	<	(map, this, b, rights, transformer, r, reducer)).fork();
5592	<	Object v;
5593	<	while ((v = advance()) != null)
5594	<	r = reducer.apply(r, transformer.apply((V)v));
5595	<	result = r;
5596	<	CountedCompleter<?> c;
5597	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5598	<	MapReduceValuesToDoubleTask<K,V>
5599	<	t = (MapReduceValuesToDoubleTask<K,V>)c,
5600	<	s = t.rights;
5601	<	while (s != null) {
5602	<	t.result = reducer.apply(t.result, s.result);
5603	<	s = t.rights = s.nextRight;
5582	>	public final void compute() {
5583	>	final ObjectToDouble<? super V> transformer;
5584	>	final DoubleByDoubleToDouble reducer;
5585	>	if ((transformer = this.transformer) != null &&
5586	>	(reducer = this.reducer) != null) {
5587	>	double r = this.basis;
5588	>	for (int i = baseIndex, f, h; batch > 0 &&
5589	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5590	>	addToPendingCount(1);
5591	>	(rights = new MapReduceValuesToDoubleTask<K,V>
5592	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5593	>	rights, transformer, r, reducer)).fork();
5594	>	}
5595	>	for (Node<K,V> p; (p = advance()) != null; )
5596	>	r = reducer.apply(r, transformer.apply(p.val));
5597	>	result = r;
5598	>	CountedCompleter<?> c;
5599	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5600	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5601	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5602	>	s = t.rights;
5603	>	while (s != null) {
5604	>	t.result = reducer.apply(t.result, s.result);
5605	>	s = t.rights = s.nextRight;
5606	>	}
5607		}
5608		}
5609		}
5610		}
5611
5612	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5613	<	extends Traverser<K,V,Double> {
5612	>	@SuppressWarnings("serial")
5613	>	static final class MapReduceEntriesToDoubleTask<K,V>
5614	>	extends BulkTask<K,V,Double> {
5615		final ObjectToDouble<Map.Entry<K,V>> transformer;
5616		final DoubleByDoubleToDouble reducer;
5617		final double basis;
5618		double result;
5619		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5620		MapReduceEntriesToDoubleTask
5621	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5621	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5622		MapReduceEntriesToDoubleTask<K,V> nextRight,
5623		ObjectToDouble<Map.Entry<K,V>> transformer,
5624		double basis,
5625		DoubleByDoubleToDouble reducer) {
5626	<	super(m, p, b); this.nextRight = nextRight;
5626	>	super(p, b, i, f, t); this.nextRight = nextRight;
5627		this.transformer = transformer;
5628		this.basis = basis; this.reducer = reducer;
5629		}
5630		public final Double getRawResult() { return result; }
5631	<	@SuppressWarnings("unchecked") public final void compute() {
5632	<	final ObjectToDouble<Map.Entry<K,V>> transformer =
5633	<	this.transformer;
5634	<	final DoubleByDoubleToDouble reducer = this.reducer;
5635	<	if (transformer == null || reducer == null)
5636	<	throw new NullPointerException();
5637	<	double r = this.basis;
5638	<	for (int b; (b = preSplit()) > 0;)
5639	<	(rights = new MapReduceEntriesToDoubleTask<K,V>
5640	<	(map, this, b, rights, transformer, r, reducer)).fork();
5641	<	Object v;
5642	<	while ((v = advance()) != null)
5643	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5644	<	result = r;
5645	<	CountedCompleter<?> c;
5646	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5647	<	MapReduceEntriesToDoubleTask<K,V>
5648	<	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5649	<	s = t.rights;
5650	<	while (s != null) {
5651	<	t.result = reducer.apply(t.result, s.result);
5652	<	s = t.rights = s.nextRight;
5631	>	public final void compute() {
5632	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
5633	>	final DoubleByDoubleToDouble reducer;
5634	>	if ((transformer = this.transformer) != null &&
5635	>	(reducer = this.reducer) != null) {
5636	>	double r = this.basis;
5637	>	for (int i = baseIndex, f, h; batch > 0 &&
5638	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5639	>	addToPendingCount(1);
5640	>	(rights = new MapReduceEntriesToDoubleTask<K,V>
5641	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5642	>	rights, transformer, r, reducer)).fork();
5643	>	}
5644	>	for (Node<K,V> p; (p = advance()) != null; )
5645	>	r = reducer.apply(r, transformer.apply(p));
5646	>	result = r;
5647	>	CountedCompleter<?> c;
5648	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5649	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5650	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5651	>	s = t.rights;
5652	>	while (s != null) {
5653	>	t.result = reducer.apply(t.result, s.result);
5654	>	s = t.rights = s.nextRight;
5655	>	}
5656		}
5657		}
5658		}
5659		}
5660
5661	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5662	<	extends Traverser<K,V,Double> {
5661	>	@SuppressWarnings("serial")
5662	>	static final class MapReduceMappingsToDoubleTask<K,V>
5663	>	extends BulkTask<K,V,Double> {
5664		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5665		final DoubleByDoubleToDouble reducer;
5666		final double basis;
5667		double result;
5668		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5669		MapReduceMappingsToDoubleTask
5670	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5670	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5671		MapReduceMappingsToDoubleTask<K,V> nextRight,
5672		ObjectByObjectToDouble<? super K, ? super V> transformer,
5673		double basis,
5674		DoubleByDoubleToDouble reducer) {
5675	<	super(m, p, b); this.nextRight = nextRight;
5675	>	super(p, b, i, f, t); this.nextRight = nextRight;
5676		this.transformer = transformer;
5677		this.basis = basis; this.reducer = reducer;
5678		}
5679		public final Double getRawResult() { return result; }
5680	<	@SuppressWarnings("unchecked") public final void compute() {
5681	<	final ObjectByObjectToDouble<? super K, ? super V> transformer =
5682	<	this.transformer;
5683	<	final DoubleByDoubleToDouble reducer = this.reducer;
5684	<	if (transformer == null || reducer == null)
5685	<	throw new NullPointerException();
5686	<	double r = this.basis;
5687	<	for (int b; (b = preSplit()) > 0;)
5688	<	(rights = new MapReduceMappingsToDoubleTask<K,V>
5689	<	(map, this, b, rights, transformer, r, reducer)).fork();
5690	<	Object v;
5691	<	while ((v = advance()) != null)
5692	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5693	<	result = r;
5694	<	CountedCompleter<?> c;
5695	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5696	<	MapReduceMappingsToDoubleTask<K,V>
5697	<	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5698	<	s = t.rights;
5699	<	while (s != null) {
5700	<	t.result = reducer.apply(t.result, s.result);
5701	<	s = t.rights = s.nextRight;
5680	>	public final void compute() {
5681	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5682	>	final DoubleByDoubleToDouble reducer;
5683	>	if ((transformer = this.transformer) != null &&
5684	>	(reducer = this.reducer) != null) {
5685	>	double r = this.basis;
5686	>	for (int i = baseIndex, f, h; batch > 0 &&
5687	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5688	>	addToPendingCount(1);
5689	>	(rights = new MapReduceMappingsToDoubleTask<K,V>
5690	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5691	>	rights, transformer, r, reducer)).fork();
5692	>	}
5693	>	for (Node<K,V> p; (p = advance()) != null; )
5694	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5695	>	result = r;
5696	>	CountedCompleter<?> c;
5697	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5698	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5699	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5700	>	s = t.rights;
5701	>	while (s != null) {
5702	>	t.result = reducer.apply(t.result, s.result);
5703	>	s = t.rights = s.nextRight;
5704	>	}
5705		}
5706		}
5707		}
5708		}
5709
5710	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5711	<	extends Traverser<K,V,Long> {
5710	>	@SuppressWarnings("serial")
5711	>	static final class MapReduceKeysToLongTask<K,V>
5712	>	extends BulkTask<K,V,Long> {
5713		final ObjectToLong<? super K> transformer;
5714		final LongByLongToLong reducer;
5715		final long basis;
5716		long result;
5717		MapReduceKeysToLongTask<K,V> rights, nextRight;
5718		MapReduceKeysToLongTask
5719	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5719	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5720		MapReduceKeysToLongTask<K,V> nextRight,
5721		ObjectToLong<? super K> transformer,
5722		long basis,
5723		LongByLongToLong reducer) {
5724	<	super(m, p, b); this.nextRight = nextRight;
5724	>	super(p, b, i, f, t); this.nextRight = nextRight;
5725		this.transformer = transformer;
5726		this.basis = basis; this.reducer = reducer;
5727		}
5728		public final Long getRawResult() { return result; }
5729	<	@SuppressWarnings("unchecked") public final void compute() {
5730	<	final ObjectToLong<? super K> transformer =
5731	<	this.transformer;
5732	<	final LongByLongToLong reducer = this.reducer;
5733	<	if (transformer == null || reducer == null)
5734	<	throw new NullPointerException();
5735	<	long r = this.basis;
5736	<	for (int b; (b = preSplit()) > 0;)
5737	<	(rights = new MapReduceKeysToLongTask<K,V>
5738	<	(map, this, b, rights, transformer, r, reducer)).fork();
5739	<	while (advance() != null)
5740	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5741	<	result = r;
5742	<	CountedCompleter<?> c;
5743	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5744	<	MapReduceKeysToLongTask<K,V>
5745	<	t = (MapReduceKeysToLongTask<K,V>)c,
5746	<	s = t.rights;
5747	<	while (s != null) {
5748	<	t.result = reducer.apply(t.result, s.result);
5749	<	s = t.rights = s.nextRight;
5729	>	public final void compute() {
5730	>	final ObjectToLong<? super K> transformer;
5731	>	final LongByLongToLong reducer;
5732	>	if ((transformer = this.transformer) != null &&
5733	>	(reducer = this.reducer) != null) {
5734	>	long r = this.basis;
5735	>	for (int i = baseIndex, f, h; batch > 0 &&
5736	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5737	>	addToPendingCount(1);
5738	>	(rights = new MapReduceKeysToLongTask<K,V>
5739	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5740	>	rights, transformer, r, reducer)).fork();
5741	>	}
5742	>	for (Node<K,V> p; (p = advance()) != null; )
5743	>	r = reducer.apply(r, transformer.apply(p.key));
5744	>	result = r;
5745	>	CountedCompleter<?> c;
5746	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5747	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5748	>	t = (MapReduceKeysToLongTask<K,V>)c,
5749	>	s = t.rights;
5750	>	while (s != null) {
5751	>	t.result = reducer.apply(t.result, s.result);
5752	>	s = t.rights = s.nextRight;
5753	>	}
5754		}
5755		}
5756		}
5757		}
5758
5759	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5760	<	extends Traverser<K,V,Long> {
5759	>	@SuppressWarnings("serial")
5760	>	static final class MapReduceValuesToLongTask<K,V>
5761	>	extends BulkTask<K,V,Long> {
5762		final ObjectToLong<? super V> transformer;
5763		final LongByLongToLong reducer;
5764		final long basis;
5765		long result;
5766		MapReduceValuesToLongTask<K,V> rights, nextRight;
5767		MapReduceValuesToLongTask
5768	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5768	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5769		MapReduceValuesToLongTask<K,V> nextRight,
5770		ObjectToLong<? super V> transformer,
5771		long basis,
5772		LongByLongToLong reducer) {
5773	<	super(m, p, b); this.nextRight = nextRight;
5773	>	super(p, b, i, f, t); this.nextRight = nextRight;
5774		this.transformer = transformer;
5775		this.basis = basis; this.reducer = reducer;
5776		}
5777		public final Long getRawResult() { return result; }
5778	<	@SuppressWarnings("unchecked") public final void compute() {
5779	<	final ObjectToLong<? super V> transformer =
5780	<	this.transformer;
5781	<	final LongByLongToLong reducer = this.reducer;
5782	<	if (transformer == null || reducer == null)
5783	<	throw new NullPointerException();
5784	<	long r = this.basis;
5785	<	for (int b; (b = preSplit()) > 0;)
5786	<	(rights = new MapReduceValuesToLongTask<K,V>
5787	<	(map, this, b, rights, transformer, r, reducer)).fork();
5788	<	Object v;
5789	<	while ((v = advance()) != null)
5790	<	r = reducer.apply(r, transformer.apply((V)v));
5791	<	result = r;
5792	<	CountedCompleter<?> c;
5793	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5794	<	MapReduceValuesToLongTask<K,V>
5795	<	t = (MapReduceValuesToLongTask<K,V>)c,
5796	<	s = t.rights;
5797	<	while (s != null) {
5798	<	t.result = reducer.apply(t.result, s.result);
5799	<	s = t.rights = s.nextRight;
5778	>	public final void compute() {
5779	>	final ObjectToLong<? super V> transformer;
5780	>	final LongByLongToLong reducer;
5781	>	if ((transformer = this.transformer) != null &&
5782	>	(reducer = this.reducer) != null) {
5783	>	long r = this.basis;
5784	>	for (int i = baseIndex, f, h; batch > 0 &&
5785	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5786	>	addToPendingCount(1);
5787	>	(rights = new MapReduceValuesToLongTask<K,V>
5788	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5789	>	rights, transformer, r, reducer)).fork();
5790	>	}
5791	>	for (Node<K,V> p; (p = advance()) != null; )
5792	>	r = reducer.apply(r, transformer.apply(p.val));
5793	>	result = r;
5794	>	CountedCompleter<?> c;
5795	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5796	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5797	>	t = (MapReduceValuesToLongTask<K,V>)c,
5798	>	s = t.rights;
5799	>	while (s != null) {
5800	>	t.result = reducer.apply(t.result, s.result);
5801	>	s = t.rights = s.nextRight;
5802	>	}
5803		}
5804		}
5805		}
5806		}
5807
5808	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5809	<	extends Traverser<K,V,Long> {
5808	>	@SuppressWarnings("serial")
5809	>	static final class MapReduceEntriesToLongTask<K,V>
5810	>	extends BulkTask<K,V,Long> {
5811		final ObjectToLong<Map.Entry<K,V>> transformer;
5812		final LongByLongToLong reducer;
5813		final long basis;
5814		long result;
5815		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5816		MapReduceEntriesToLongTask
5817	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5817	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5818		MapReduceEntriesToLongTask<K,V> nextRight,
5819		ObjectToLong<Map.Entry<K,V>> transformer,
5820		long basis,
5821		LongByLongToLong reducer) {
5822	<	super(m, p, b); this.nextRight = nextRight;
5822	>	super(p, b, i, f, t); this.nextRight = nextRight;
5823		this.transformer = transformer;
5824		this.basis = basis; this.reducer = reducer;
5825		}
5826		public final Long getRawResult() { return result; }
5827	<	@SuppressWarnings("unchecked") public final void compute() {
5828	<	final ObjectToLong<Map.Entry<K,V>> transformer =
5829	<	this.transformer;
5830	<	final LongByLongToLong reducer = this.reducer;
5831	<	if (transformer == null || reducer == null)
5832	<	throw new NullPointerException();
5833	<	long r = this.basis;
5834	<	for (int b; (b = preSplit()) > 0;)
5835	<	(rights = new MapReduceEntriesToLongTask<K,V>
5836	<	(map, this, b, rights, transformer, r, reducer)).fork();
5837	<	Object v;
5838	<	while ((v = advance()) != null)
5839	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5840	<	result = r;
5841	<	CountedCompleter<?> c;
5842	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5843	<	MapReduceEntriesToLongTask<K,V>
5844	<	t = (MapReduceEntriesToLongTask<K,V>)c,
5845	<	s = t.rights;
5846	<	while (s != null) {
5847	<	t.result = reducer.apply(t.result, s.result);
5848	<	s = t.rights = s.nextRight;
5827	>	public final void compute() {
5828	>	final ObjectToLong<Map.Entry<K,V>> transformer;
5829	>	final LongByLongToLong reducer;
5830	>	if ((transformer = this.transformer) != null &&
5831	>	(reducer = this.reducer) != null) {
5832	>	long r = this.basis;
5833	>	for (int i = baseIndex, f, h; batch > 0 &&
5834	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5835	>	addToPendingCount(1);
5836	>	(rights = new MapReduceEntriesToLongTask<K,V>
5837	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5838	>	rights, transformer, r, reducer)).fork();
5839	>	}
5840	>	for (Node<K,V> p; (p = advance()) != null; )
5841	>	r = reducer.apply(r, transformer.apply(p));
5842	>	result = r;
5843	>	CountedCompleter<?> c;
5844	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5845	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5846	>	t = (MapReduceEntriesToLongTask<K,V>)c,
5847	>	s = t.rights;
5848	>	while (s != null) {
5849	>	t.result = reducer.apply(t.result, s.result);
5850	>	s = t.rights = s.nextRight;
5851	>	}
5852		}
5853		}
5854		}
5855		}
5856
5857	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5858	<	extends Traverser<K,V,Long> {
5857	>	@SuppressWarnings("serial")
5858	>	static final class MapReduceMappingsToLongTask<K,V>
5859	>	extends BulkTask<K,V,Long> {
5860		final ObjectByObjectToLong<? super K, ? super V> transformer;
5861		final LongByLongToLong reducer;
5862		final long basis;
5863		long result;
5864		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5865		MapReduceMappingsToLongTask
5866	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5866	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5867		MapReduceMappingsToLongTask<K,V> nextRight,
5868		ObjectByObjectToLong<? super K, ? super V> transformer,
5869		long basis,
5870		LongByLongToLong reducer) {
5871	<	super(m, p, b); this.nextRight = nextRight;
5871	>	super(p, b, i, f, t); this.nextRight = nextRight;
5872		this.transformer = transformer;
5873		this.basis = basis; this.reducer = reducer;
5874		}
5875		public final Long getRawResult() { return result; }
5876	<	@SuppressWarnings("unchecked") public final void compute() {
5877	<	final ObjectByObjectToLong<? super K, ? super V> transformer =
5878	<	this.transformer;
5879	<	final LongByLongToLong reducer = this.reducer;
5880	<	if (transformer == null || reducer == null)
5881	<	throw new NullPointerException();
5882	<	long r = this.basis;
5883	<	for (int b; (b = preSplit()) > 0;)
5884	<	(rights = new MapReduceMappingsToLongTask<K,V>
5885	<	(map, this, b, rights, transformer, r, reducer)).fork();
5886	<	Object v;
5887	<	while ((v = advance()) != null)
5888	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5889	<	result = r;
5890	<	CountedCompleter<?> c;
5891	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5892	<	MapReduceMappingsToLongTask<K,V>
5893	<	t = (MapReduceMappingsToLongTask<K,V>)c,
5894	<	s = t.rights;
5895	<	while (s != null) {
5896	<	t.result = reducer.apply(t.result, s.result);
5897	<	s = t.rights = s.nextRight;
5876	>	public final void compute() {
5877	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
5878	>	final LongByLongToLong reducer;
5879	>	if ((transformer = this.transformer) != null &&
5880	>	(reducer = this.reducer) != null) {
5881	>	long r = this.basis;
5882	>	for (int i = baseIndex, f, h; batch > 0 &&
5883	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5884	>	addToPendingCount(1);
5885	>	(rights = new MapReduceMappingsToLongTask<K,V>
5886	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5887	>	rights, transformer, r, reducer)).fork();
5888	>	}
5889	>	for (Node<K,V> p; (p = advance()) != null; )
5890	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5891	>	result = r;
5892	>	CountedCompleter<?> c;
5893	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5894	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5895	>	t = (MapReduceMappingsToLongTask<K,V>)c,
5896	>	s = t.rights;
5897	>	while (s != null) {
5898	>	t.result = reducer.apply(t.result, s.result);
5899	>	s = t.rights = s.nextRight;
5900	>	}
5901		}
5902		}
5903		}
5904		}
5905
5906	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5907	<	extends Traverser<K,V,Integer> {
5906	>	@SuppressWarnings("serial")
5907	>	static final class MapReduceKeysToIntTask<K,V>
5908	>	extends BulkTask<K,V,Integer> {
5909		final ObjectToInt<? super K> transformer;
5910		final IntByIntToInt reducer;
5911		final int basis;
5912		int result;
5913		MapReduceKeysToIntTask<K,V> rights, nextRight;
5914		MapReduceKeysToIntTask
5915	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5915	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5916		MapReduceKeysToIntTask<K,V> nextRight,
5917		ObjectToInt<? super K> transformer,
5918		int basis,
5919		IntByIntToInt reducer) {
5920	<	super(m, p, b); this.nextRight = nextRight;
5920	>	super(p, b, i, f, t); this.nextRight = nextRight;
5921		this.transformer = transformer;
5922		this.basis = basis; this.reducer = reducer;
5923		}
5924		public final Integer getRawResult() { return result; }
5925	<	@SuppressWarnings("unchecked") public final void compute() {
5926	<	final ObjectToInt<? super K> transformer =
5927	<	this.transformer;
5928	<	final IntByIntToInt reducer = this.reducer;
5929	<	if (transformer == null || reducer == null)
5930	<	throw new NullPointerException();
5931	<	int r = this.basis;
5932	<	for (int b; (b = preSplit()) > 0;)
5933	<	(rights = new MapReduceKeysToIntTask<K,V>
5934	<	(map, this, b, rights, transformer, r, reducer)).fork();
5935	<	while (advance() != null)
5936	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5937	<	result = r;
5938	<	CountedCompleter<?> c;
5939	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5940	<	MapReduceKeysToIntTask<K,V>
5941	<	t = (MapReduceKeysToIntTask<K,V>)c,
5942	<	s = t.rights;
5943	<	while (s != null) {
5944	<	t.result = reducer.apply(t.result, s.result);
5945	<	s = t.rights = s.nextRight;
5925	>	public final void compute() {
5926	>	final ObjectToInt<? super K> transformer;
5927	>	final IntByIntToInt reducer;
5928	>	if ((transformer = this.transformer) != null &&
5929	>	(reducer = this.reducer) != null) {
5930	>	int r = this.basis;
5931	>	for (int i = baseIndex, f, h; batch > 0 &&
5932	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5933	>	addToPendingCount(1);
5934	>	(rights = new MapReduceKeysToIntTask<K,V>
5935	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5936	>	rights, transformer, r, reducer)).fork();
5937	>	}
5938	>	for (Node<K,V> p; (p = advance()) != null; )
5939	>	r = reducer.apply(r, transformer.apply(p.key));
5940	>	result = r;
5941	>	CountedCompleter<?> c;
5942	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5943	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5944	>	t = (MapReduceKeysToIntTask<K,V>)c,
5945	>	s = t.rights;
5946	>	while (s != null) {
5947	>	t.result = reducer.apply(t.result, s.result);
5948	>	s = t.rights = s.nextRight;
5949	>	}
5950		}
5951		}
5952		}
5953		}
5954
5955	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5956	<	extends Traverser<K,V,Integer> {
5955	>	@SuppressWarnings("serial")
5956	>	static final class MapReduceValuesToIntTask<K,V>
5957	>	extends BulkTask<K,V,Integer> {
5958		final ObjectToInt<? super V> transformer;
5959		final IntByIntToInt reducer;
5960		final int basis;
5961		int result;
5962		MapReduceValuesToIntTask<K,V> rights, nextRight;
5963		MapReduceValuesToIntTask
5964	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5964	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5965		MapReduceValuesToIntTask<K,V> nextRight,
5966		ObjectToInt<? super V> transformer,
5967		int basis,
5968		IntByIntToInt reducer) {
5969	<	super(m, p, b); this.nextRight = nextRight;
5969	>	super(p, b, i, f, t); this.nextRight = nextRight;
5970		this.transformer = transformer;
5971		this.basis = basis; this.reducer = reducer;
5972		}
5973		public final Integer getRawResult() { return result; }
5974	<	@SuppressWarnings("unchecked") public final void compute() {
5975	<	final ObjectToInt<? super V> transformer =
5976	<	this.transformer;
5977	<	final IntByIntToInt reducer = this.reducer;
5978	<	if (transformer == null || reducer == null)
5979	<	throw new NullPointerException();
5980	<	int r = this.basis;
5981	<	for (int b; (b = preSplit()) > 0;)
5982	<	(rights = new MapReduceValuesToIntTask<K,V>
5983	<	(map, this, b, rights, transformer, r, reducer)).fork();
5984	<	Object v;
5985	<	while ((v = advance()) != null)
5986	<	r = reducer.apply(r, transformer.apply((V)v));
5987	<	result = r;
5988	<	CountedCompleter<?> c;
5989	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5990	<	MapReduceValuesToIntTask<K,V>
5991	<	t = (MapReduceValuesToIntTask<K,V>)c,
5992	<	s = t.rights;
5993	<	while (s != null) {
5994	<	t.result = reducer.apply(t.result, s.result);
5995	<	s = t.rights = s.nextRight;
5974	>	public final void compute() {
5975	>	final ObjectToInt<? super V> transformer;
5976	>	final IntByIntToInt reducer;
5977	>	if ((transformer = this.transformer) != null &&
5978	>	(reducer = this.reducer) != null) {
5979	>	int r = this.basis;
5980	>	for (int i = baseIndex, f, h; batch > 0 &&
5981	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5982	>	addToPendingCount(1);
5983	>	(rights = new MapReduceValuesToIntTask<K,V>
5984	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5985	>	rights, transformer, r, reducer)).fork();
5986	>	}
5987	>	for (Node<K,V> p; (p = advance()) != null; )
5988	>	r = reducer.apply(r, transformer.apply(p.val));
5989	>	result = r;
5990	>	CountedCompleter<?> c;
5991	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5992	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5993	>	t = (MapReduceValuesToIntTask<K,V>)c,
5994	>	s = t.rights;
5995	>	while (s != null) {
5996	>	t.result = reducer.apply(t.result, s.result);
5997	>	s = t.rights = s.nextRight;
5998	>	}
5999		}
6000		}
6001		}
6002		}
6003
6004	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
6005	<	extends Traverser<K,V,Integer> {
6004	>	@SuppressWarnings("serial")
6005	>	static final class MapReduceEntriesToIntTask<K,V>
6006	>	extends BulkTask<K,V,Integer> {
6007		final ObjectToInt<Map.Entry<K,V>> transformer;
6008		final IntByIntToInt reducer;
6009		final int basis;
6010		int result;
6011		MapReduceEntriesToIntTask<K,V> rights, nextRight;
6012		MapReduceEntriesToIntTask
6013	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6013	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6014		MapReduceEntriesToIntTask<K,V> nextRight,
6015		ObjectToInt<Map.Entry<K,V>> transformer,
6016		int basis,
6017		IntByIntToInt reducer) {
6018	<	super(m, p, b); this.nextRight = nextRight;
6018	>	super(p, b, i, f, t); this.nextRight = nextRight;
6019		this.transformer = transformer;
6020		this.basis = basis; this.reducer = reducer;
6021		}
6022		public final Integer getRawResult() { return result; }
6023	<	@SuppressWarnings("unchecked") public final void compute() {
6024	<	final ObjectToInt<Map.Entry<K,V>> transformer =
6025	<	this.transformer;
6026	<	final IntByIntToInt reducer = this.reducer;
6027	<	if (transformer == null || reducer == null)
6028	<	throw new NullPointerException();
6029	<	int r = this.basis;
6030	<	for (int b; (b = preSplit()) > 0;)
6031	<	(rights = new MapReduceEntriesToIntTask<K,V>
6032	<	(map, this, b, rights, transformer, r, reducer)).fork();
6033	<	Object v;
6034	<	while ((v = advance()) != null)
6035	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
6036	<	result = r;
6037	<	CountedCompleter<?> c;
6038	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6039	<	MapReduceEntriesToIntTask<K,V>
6040	<	t = (MapReduceEntriesToIntTask<K,V>)c,
6041	<	s = t.rights;
6042	<	while (s != null) {
6043	<	t.result = reducer.apply(t.result, s.result);
6044	<	s = t.rights = s.nextRight;
6023	>	public final void compute() {
6024	>	final ObjectToInt<Map.Entry<K,V>> transformer;
6025	>	final IntByIntToInt reducer;
6026	>	if ((transformer = this.transformer) != null &&
6027	>	(reducer = this.reducer) != null) {
6028	>	int r = this.basis;
6029	>	for (int i = baseIndex, f, h; batch > 0 &&
6030	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6031	>	addToPendingCount(1);
6032	>	(rights = new MapReduceEntriesToIntTask<K,V>
6033	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6034	>	rights, transformer, r, reducer)).fork();
6035	>	}
6036	>	for (Node<K,V> p; (p = advance()) != null; )
6037	>	r = reducer.apply(r, transformer.apply(p));
6038	>	result = r;
6039	>	CountedCompleter<?> c;
6040	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6041	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
6042	>	t = (MapReduceEntriesToIntTask<K,V>)c,
6043	>	s = t.rights;
6044	>	while (s != null) {
6045	>	t.result = reducer.apply(t.result, s.result);
6046	>	s = t.rights = s.nextRight;
6047	>	}
6048		}
6049		}
6050		}
6051		}
6052
6053	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
6054	<	extends Traverser<K,V,Integer> {
6053	>	@SuppressWarnings("serial")
6054	>	static final class MapReduceMappingsToIntTask<K,V>
6055	>	extends BulkTask<K,V,Integer> {
6056		final ObjectByObjectToInt<? super K, ? super V> transformer;
6057		final IntByIntToInt reducer;
6058		final int basis;
6059		int result;
6060		MapReduceMappingsToIntTask<K,V> rights, nextRight;
6061		MapReduceMappingsToIntTask
6062	<	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6062	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6063		MapReduceMappingsToIntTask<K,V> nextRight,
6064		ObjectByObjectToInt<? super K, ? super V> transformer,
6065		int basis,
6066		IntByIntToInt reducer) {
6067	<	super(m, p, b); this.nextRight = nextRight;
6067	>	super(p, b, i, f, t); this.nextRight = nextRight;
6068		this.transformer = transformer;
6069		this.basis = basis; this.reducer = reducer;
6070		}
6071		public final Integer getRawResult() { return result; }
6072	<	@SuppressWarnings("unchecked") public final void compute() {
6073	<	final ObjectByObjectToInt<? super K, ? super V> transformer =
6074	<	this.transformer;
6075	<	final IntByIntToInt reducer = this.reducer;
6076	<	if (transformer == null || reducer == null)
6077	<	throw new NullPointerException();
6078	<	int r = this.basis;
6079	<	for (int b; (b = preSplit()) > 0;)
6080	<	(rights = new MapReduceMappingsToIntTask<K,V>
6081	<	(map, this, b, rights, transformer, r, reducer)).fork();
6082	<	Object v;
6083	<	while ((v = advance()) != null)
6084	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
6085	<	result = r;
6086	<	CountedCompleter<?> c;
6087	<	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6088	<	MapReduceMappingsToIntTask<K,V>
6089	<	t = (MapReduceMappingsToIntTask<K,V>)c,
6090	<	s = t.rights;
6091	<	while (s != null) {
6092	<	t.result = reducer.apply(t.result, s.result);
6093	<	s = t.rights = s.nextRight;
6072	>	public final void compute() {
6073	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
6074	>	final IntByIntToInt reducer;
6075	>	if ((transformer = this.transformer) != null &&
6076	>	(reducer = this.reducer) != null) {
6077	>	int r = this.basis;
6078	>	for (int i = baseIndex, f, h; batch > 0 &&
6079	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6080	>	addToPendingCount(1);
6081	>	(rights = new MapReduceMappingsToIntTask<K,V>
6082	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6083	>	rights, transformer, r, reducer)).fork();
6084	>	}
6085	>	for (Node<K,V> p; (p = advance()) != null; )
6086	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
6087	>	result = r;
6088	>	CountedCompleter<?> c;
6089	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6090	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
6091	>	t = (MapReduceMappingsToIntTask<K,V>)c,
6092	>	s = t.rights;
6093	>	while (s != null) {
6094	>	t.result = reducer.apply(t.result, s.result);
6095	>	s = t.rights = s.nextRight;
6096	>	}
6097	>	}
6098	>	}
6099	>	}
6100	>	}
6101	>
6102	>	/* ---------------- Counters -------------- */
6103	>
6104	>	// Adapted from LongAdder and Striped64.
6105	>	// See their internal docs for explanation.
6106	>
6107	>	// A padded cell for distributing counts
6108	>	static final class CounterCell {
6109	>	volatile long p0, p1, p2, p3, p4, p5, p6;
6110	>	volatile long value;
6111	>	volatile long q0, q1, q2, q3, q4, q5, q6;
6112	>	CounterCell(long x) { value = x; }
6113	>	}
6114	>
6115	>	/**
6116	>	* Holder for the thread-local hash code determining which
6117	>	* CounterCell to use. The code is initialized via the
6118	>	* counterHashCodeGenerator, but may be moved upon collisions.
6119	>	*/
6120	>	static final class CounterHashCode {
6121	>	int code;
6122	>	}
6123	>
6124	>	/**
6125	>	* Generates initial value for per-thread CounterHashCodes.
6126	>	*/
6127	>	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
6128	>
6129	>	/**
6130	>	* Increment for counterHashCodeGenerator. See class ThreadLocal
6131	>	* for explanation.
6132	>	*/
6133	>	static final int SEED_INCREMENT = 0x61c88647;
6134	>
6135	>	/**
6136	>	* Per-thread counter hash codes. Shared across all instances.
6137	>	*/
6138	>	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
6139	>	new ThreadLocal<CounterHashCode>();
6140	>
6141	>
6142	>	final long sumCount() {
6143	>	CounterCell[] as = counterCells; CounterCell a;
6144	>	long sum = baseCount;
6145	>	if (as != null) {
6146	>	for (int i = 0; i < as.length; ++i) {
6147	>	if ((a = as[i]) != null)
6148	>	sum += a.value;
6149	>	}
6150	>	}
6151	>	return sum;
6152	>	}
6153	>
6154	>	// See LongAdder version for explanation
6155	>	private final void fullAddCount(long x, CounterHashCode hc,
6156	>	boolean wasUncontended) {
6157	>	int h;
6158	>	if (hc == null) {
6159	>	hc = new CounterHashCode();
6160	>	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
6161	>	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
6162	>	threadCounterHashCode.set(hc);
6163	>	}
6164	>	else
6165	>	h = hc.code;
6166	>	boolean collide = false;                // True if last slot nonempty
6167	>	for (;;) {
6168	>	CounterCell[] as; CounterCell a; int n; long v;
6169	>	if ((as = counterCells) != null && (n = as.length) > 0) {
6170	>	if ((a = as[(n - 1) & h]) == null) {
6171	>	if (cellsBusy == 0) {            // Try to attach new Cell
6172	>	CounterCell r = new CounterCell(x); // Optimistic create
6173	>	if (cellsBusy == 0 &&
6174	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6175	>	boolean created = false;
6176	>	try {               // Recheck under lock
6177	>	CounterCell[] rs; int m, j;
6178	>	if ((rs = counterCells) != null &&
6179	>	(m = rs.length) > 0 &&
6180	>	rs[j = (m - 1) & h] == null) {
6181	>	rs[j] = r;
6182	>	created = true;
6183	>	}
6184	>	} finally {
6185	>	cellsBusy = 0;
6186	>	}
6187	>	if (created)
6188	>	break;
6189	>	continue;           // Slot is now non-empty
6190	>	}
6191	>	}
6192	>	collide = false;
6193	>	}
6194	>	else if (!wasUncontended)       // CAS already known to fail
6195	>	wasUncontended = true;      // Continue after rehash
6196	>	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
6197	>	break;
6198	>	else if (counterCells != as || n >= NCPU)
6199	>	collide = false;            // At max size or stale
6200	>	else if (!collide)
6201	>	collide = true;
6202	>	else if (cellsBusy == 0 &&
6203	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6204	>	try {
6205	>	if (counterCells == as) {// Expand table unless stale
6206	>	CounterCell[] rs = new CounterCell[n << 1];
6207	>	for (int i = 0; i < n; ++i)
6208	>	rs[i] = as[i];
6209	>	counterCells = rs;
6210	>	}
6211	>	} finally {
6212	>	cellsBusy = 0;
6213	>	}
6214	>	collide = false;
6215	>	continue;                   // Retry with expanded table
6216	>	}
6217	>	h ^= h << 13;                   // Rehash
6218	>	h ^= h >>> 17;
6219	>	h ^= h << 5;
6220	>	}
6221	>	else if (cellsBusy == 0 && counterCells == as &&
6222	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6223	>	boolean init = false;
6224	>	try {                           // Initialize table
6225	>	if (counterCells == as) {
6226	>	CounterCell[] rs = new CounterCell[2];
6227	>	rs[h & 1] = new CounterCell(x);
6228	>	counterCells = rs;
6229	>	init = true;
6230	>	}
6231	>	} finally {
6232	>	cellsBusy = 0;
6233		}
6234	+	if (init)
6235	+	break;
6236		}
6237	+	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
6238	+	break;                          // Fall back on using base
6239		}
6240	+	hc.code = h;                            // Record index for next time
6241		}
6242
6243		// Unsafe mechanics
6244	<	private static final sun.misc.Unsafe UNSAFE;
6245	<	private static final long counterOffset;
6246	<	private static final long sizeCtlOffset;
6244	>	private static final sun.misc.Unsafe U;
6245	>	private static final long SIZECTL;
6246	>	private static final long TRANSFERINDEX;
6247	>	private static final long BASECOUNT;
6248	>	private static final long CELLSBUSY;
6249	>	private static final long CELLVALUE;
6250		private static final long ABASE;
6251		private static final int ASHIFT;
6252
6253		static {
6621	–	int ss;
6254		try {
6255	<	UNSAFE = getUnsafe();
6255	>	U = getUnsafe();
6256		Class<?> k = ConcurrentHashMapV8.class;
6257	<	counterOffset = UNSAFE.objectFieldOffset
6626	<	(k.getDeclaredField("counter"));
6627	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6257	>	SIZECTL = U.objectFieldOffset
6258		(k.getDeclaredField("sizeCtl"));
6259	<	Class<?> sc = Node[].class;
6260	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6261	<	ss = UNSAFE.arrayIndexScale(sc);
6259	>	TRANSFERINDEX = U.objectFieldOffset
6260	>	(k.getDeclaredField("transferIndex"));
6261	>	BASECOUNT = U.objectFieldOffset
6262	>	(k.getDeclaredField("baseCount"));
6263	>	CELLSBUSY = U.objectFieldOffset
6264	>	(k.getDeclaredField("cellsBusy"));
6265	>	Class<?> ck = CounterCell.class;
6266	>	CELLVALUE = U.objectFieldOffset
6267	>	(ck.getDeclaredField("value"));
6268	>	Class<?> ak = Node[].class;
6269	>	ABASE = U.arrayBaseOffset(ak);
6270	>	int scale = U.arrayIndexScale(ak);
6271	>	if ((scale & (scale - 1)) != 0)
6272	>	throw new Error("data type scale not a power of two");
6273	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6274		} catch (Exception e) {
6275		throw new Error(e);
6276		}
6635	–	if ((ss & (ss-1)) != 0)
6636	–	throw new Error("data type scale not a power of two");
6637	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6277		}
6278
6279		/**
#	Line 6647 | Line 6286 | public class ConcurrentHashMapV8<K, V>
6286		private static sun.misc.Unsafe getUnsafe() {
6287		try {
6288		return sun.misc.Unsafe.getUnsafe();
6289	<	} catch (SecurityException se) {
6290	<	try {
6291	<	return java.security.AccessController.doPrivileged
6292	<	(new java.security
6293	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6294	<	public sun.misc.Unsafe run() throws Exception {
6295	<	java.lang.reflect.Field f = sun.misc
6296	<	.Unsafe.class.getDeclaredField("theUnsafe");
6297	<	f.setAccessible(true);
6298	<	return (sun.misc.Unsafe) f.get(null);
6299	<	}});
6300	<	} catch (java.security.PrivilegedActionException e) {
6301	<	throw new RuntimeException("Could not initialize intrinsics",
6302	<	e.getCause());
6303	<	}
6289	>	} catch (SecurityException tryReflectionInstead) {}
6290	>	try {
6291	>	return java.security.AccessController.doPrivileged
6292	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6293	>	public sun.misc.Unsafe run() throws Exception {
6294	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6295	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6296	>	f.setAccessible(true);
6297	>	Object x = f.get(null);
6298	>	if (k.isInstance(x))
6299	>	return k.cast(x);
6300	>	}
6301	>	throw new NoSuchFieldError("the Unsafe");
6302	>	}});
6303	>	} catch (java.security.PrivilegedActionException e) {
6304	>	throw new RuntimeException("Could not initialize intrinsics",
6305	>	e.getCause());
6306		}
6307		}
6308		}

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