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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.72 by jsr166, Tue Oct 30 16:05:35 2012 UTC vs.
Revision 1.123 by jsr166, Fri Feb 27 21:08:53 2015 UTC

#	Line 6 | Line 6
6
7		package jsr166e;
8
9	<	import java.util.Comparator;
9	>	import jsr166e.ForkJoinPool;
10	>
11	>	import java.io.ObjectStreamField;
12	>	import java.io.Serializable;
13	>	import java.lang.reflect.ParameterizedType;
14	>	import java.lang.reflect.Type;
15	>	import java.util.AbstractMap;
16		import java.util.Arrays;
11	–	import java.util.Map;
12	–	import java.util.Set;
17		import java.util.Collection;
18	<	import java.util.AbstractMap;
19	<	import java.util.AbstractSet;
16	<	import java.util.AbstractCollection;
17	<	import java.util.Hashtable;
18	>	import java.util.ConcurrentModificationException;
19	>	import java.util.Enumeration;
20		import java.util.HashMap;
21	+	import java.util.Hashtable;
22		import java.util.Iterator;
23	<	import java.util.Enumeration;
21	<	import java.util.ConcurrentModificationException;
23	>	import java.util.Map;
24		import java.util.NoSuchElementException;
25	+	import java.util.Set;
26		import java.util.concurrent.ConcurrentMap;
24	–	import java.util.concurrent.ThreadLocalRandom;
25	–	import java.util.concurrent.locks.LockSupport;
26	–	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
27		import java.util.concurrent.atomic.AtomicReference;
28	<
29	<	import java.io.Serializable;
28	>	import java.util.concurrent.atomic.AtomicInteger;
29	>	import java.util.concurrent.locks.LockSupport;
30	>	import java.util.concurrent.locks.ReentrantLock;
31
32		/**
33		* A hash table supporting full concurrency of retrievals and
#	Line 40 | Line 41 | import java.io.Serializable;
41		* interoperable with {@code Hashtable} in programs that rely on its
42		* thread safety but not on its synchronization details.
43		*
44	<	* <p> Retrieval operations (including {@code get}) generally do not
44	>	* <p>Retrieval operations (including {@code get}) generally do not
45		* block, so may overlap with update operations (including {@code put}
46		* and {@code remove}). Retrievals reflect the results of the most
47		* recently <em>completed</em> update operations holding upon their
#	Line 61 | Line 62 | import java.io.Serializable;
62		* that may be adequate for monitoring or estimation purposes, but not
63		* for program control.
64		*
65	<	* <p> The table is dynamically expanded when there are too many
65	>	* <p>The table is dynamically expanded when there are too many
66		* collisions (i.e., keys that have distinct hash codes but fall into
67		* the same slot modulo the table size), with the expected average
68		* effect of maintaining roughly two bins per mapping (corresponding
#	Line 80 | Line 81 | import java.io.Serializable;
81		* expected {@code concurrencyLevel} as an additional hint for
82		* internal sizing.  Note that using many keys with exactly the same
83		* {@code hashCode()} is a sure way to slow down performance of any
84	<	* hash table.
84	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
85	>	* this class may use comparison order among keys to help break ties.
86		*
87	<	* <p> A {@link Set} projection of a ConcurrentHashMapV8 may be created
87	>	* <p>A {@link Set} projection of a ConcurrentHashMapV8 may be created
88		* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
89		* (using {@link #keySet(Object)} when only keys are of interest, and the
90		* mapped values are (perhaps transiently) not used or all take the
91		* same mapping value.
92		*
91	–	* <p> A ConcurrentHashMapV8 can be used as scalable frequency map (a
92	–	* form of histogram or multiset) by using {@link LongAdder} values
93	–	* and initializing via {@link #computeIfAbsent}. For example, to add
94	–	* a count to a {@code ConcurrentHashMapV8<String,LongAdder> freqs}, you
95	–	* can use {@code freqs.computeIfAbsent(k -> new
96	–	* LongAdder()).increment();}
97	–	*
93		* <p>This class and its views and iterators implement all of the
94		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
95		* interfaces.
96		*
97	<	* <p> Like {@link Hashtable} but unlike {@link HashMap}, this class
97	>	* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
98		* does <em>not</em> allow {@code null} to be used as a key or value.
99		*
100	<	* <p>ConcurrentHashMapV8s support parallel operations using the {@link
101	<	* ForkJoinPool#commonPool}. (Task that may be used in other contexts
102	<	* are available in class {@link ForkJoinTasks}). These operations are
103	<	* designed to be safely, and often sensibly, applied even with maps
104	<	* that are being concurrently updated by other threads; for example,
105	<	* when computing a snapshot summary of the values in a shared
106	<	* registry.  There are three kinds of operation, each with four
107	<	* forms, accepting functions with Keys, Values, Entries, and (Key,
108	<	* Value) arguments and/or return values. Because the elements of a
109	<	* ConcurrentHashMapV8 are not ordered in any particular way, and may be
110	<	* processed in different orders in different parallel executions, the
111	<	* correctness of supplied functions should not depend on any
112	<	* ordering, or on any other objects or values that may transiently
113	<	* change while computation is in progress; and except for forEach
114	<	* actions, should ideally be side-effect-free.
100	>	* <p>ConcurrentHashMapV8s support a set of sequential and parallel bulk
101	>	* operations that are designed
102	>	* to be safely, and often sensibly, applied even with maps that are
103	>	* being concurrently updated by other threads; for example, when
104	>	* computing a snapshot summary of the values in a shared registry.
105	>	* There are three kinds of operation, each with four forms, accepting
106	>	* functions with Keys, Values, Entries, and (Key, Value) arguments
107	>	* and/or return values. Because the elements of a ConcurrentHashMapV8
108	>	* are not ordered in any particular way, and may be processed in
109	>	* different orders in different parallel executions, the correctness
110	>	* of supplied functions should not depend on any ordering, or on any
111	>	* other objects or values that may transiently change while
112	>	* computation is in progress; and except for forEach actions, should
113	>	* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry}
114	>	* objects do not support method {@code setValue}.
115		*
116		* <ul>
117		* <li> forEach: Perform a given action on each element.
#	Line 143 | Line 138 | import java.io.Serializable;
138		* <li> Reductions to scalar doubles, longs, and ints, using a
139		* given basis value.</li>
140		*
146	–	* </li>
141		* </ul>
142	+	* </li>
143		* </ul>
144		*
145	+	* <p>These bulk operations accept a {@code parallelismThreshold}
146	+	* argument. Methods proceed sequentially if the current map size is
147	+	* estimated to be less than the given threshold. Using a value of
148	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
149	+	* of {@code 1} results in maximal parallelism by partitioning into
150	+	* enough subtasks to fully utilize the {@link
151	+	* ForkJoinPool#commonPool()} that is used for all parallel
152	+	* computations. Normally, you would initially choose one of these
153	+	* extreme values, and then measure performance of using in-between
154	+	* values that trade off overhead versus throughput.
155	+	*
156		* <p>The concurrency properties of bulk operations follow
157		* from those of ConcurrentHashMapV8: Any non-null result returned
158		* from {@code get(key)} and related access methods bears a
#	Line 182 | Line 188 | import java.io.Serializable;
188		* arguments can be supplied using {@code new
189		* AbstractMap.SimpleEntry(k,v)}.
190		*
191	<	* <p> Bulk operations may complete abruptly, throwing an
191	>	* <p>Bulk operations may complete abruptly, throwing an
192		* exception encountered in the application of a supplied
193		* function. Bear in mind when handling such exceptions that other
194		* concurrently executing functions could also have thrown
195		* exceptions, or would have done so if the first exception had
196		* not occurred.
197		*
198	<	* <p>Parallel speedups for bulk operations compared to sequential
199	<	* processing are common but not guaranteed.  Operations involving
200	<	* brief functions on small maps may execute more slowly than
201	<	* sequential loops if the underlying work to parallelize the
202	<	* computation is more expensive than the computation
203	<	* itself. Similarly, parallelization may not lead to much actual
204	<	* parallelism if all processors are busy performing unrelated tasks.
198	>	* <p>Speedups for parallel compared to sequential forms are common
199	>	* but not guaranteed.  Parallel operations involving brief functions
200	>	* on small maps may execute more slowly than sequential forms if the
201	>	* underlying work to parallelize the computation is more expensive
202	>	* than the computation itself.  Similarly, parallelization may not
203	>	* lead to much actual parallelism if all processors are busy
204	>	* performing unrelated tasks.
205		*
206	<	* <p> All arguments to all task methods must be non-null.
206	>	* <p>All arguments to all task methods must be non-null.
207		*
208		* <p><em>jsr166e note: During transition, this class
209		* uses nested functional interfaces with different names but the
210	<	* same forms as those expected for JDK8.<em>
210	>	* same forms as those expected for JDK8.</em>
211		*
212		* <p>This class is a member of the
213		* <a href="{@docRoot}/../technotes/guides/collections/index.html">
#	Line 212 | Line 218 | import java.io.Serializable;
218		* @param <K> the type of keys maintained by this map
219		* @param <V> the type of mapped values
220		*/
221	<	public class ConcurrentHashMapV8<K, V>
222	<	implements ConcurrentMap<K, V>, Serializable {
221	>	public class ConcurrentHashMapV8<K,V> extends AbstractMap<K,V>
222	>	implements ConcurrentMap<K,V>, Serializable {
223		private static final long serialVersionUID = 7249069246763182397L;
224
225		/**
226	<	* A partitionable iterator. A Spliterator can be traversed
227	<	* directly, but can also be partitioned (before traversal) by
228	<	* creating another Spliterator that covers a non-overlapping
223	<	* portion of the elements, and so may be amenable to parallel
224	<	* execution.
225	<	*
226	<	* <p> This interface exports a subset of expected JDK8
227	<	* functionality.
228	<	*
229	<	* <p>Sample usage: Here is one (of the several) ways to compute
230	<	* the sum of the values held in a map using the ForkJoin
231	<	* framework. As illustrated here, Spliterators are well suited to
232	<	* designs in which a task repeatedly splits off half its work
233	<	* into forked subtasks until small enough to process directly,
234	<	* and then joins these subtasks. Variants of this style can also
235	<	* be used in completion-based designs.
236	<	*
237	<	* <pre>
238	<	* {@code ConcurrentHashMapV8<String, Long> m = ...
239	<	* // split as if have 8 * parallelism, for load balance
240	<	* int n = m.size();
241	<	* int p = aForkJoinPool.getParallelism() * 8;
242	<	* int split = (n < p)? n : p;
243	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
244	<	* // ...
245	<	* static class SumValues extends RecursiveTask<Long> {
246	<	*   final Spliterator<Long> s;
247	<	*   final int split;             // split while > 1
248	<	*   final SumValues nextJoin;    // records forked subtasks to join
249	<	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
250	<	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
251	<	*   }
252	<	*   public Long compute() {
253	<	*     long sum = 0;
254	<	*     SumValues subtasks = null; // fork subtasks
255	<	*     for (int s = split >>> 1; s > 0; s >>>= 1)
256	<	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
257	<	*     while (s.hasNext())        // directly process remaining elements
258	<	*       sum += s.next();
259	<	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
260	<	*       sum += t.join();         // collect subtask results
261	<	*     return sum;
262	<	*   }
263	<	* }
264	<	* }</pre>
226	>	* An object for traversing and partitioning elements of a source.
227	>	* This interface provides a subset of the functionality of JDK8
228	>	* java.util.Spliterator.
229		*/
230	<	public static interface Spliterator<T> extends Iterator<T> {
230	>	public static interface ConcurrentHashMapSpliterator<T> {
231		/**
232	<	* Returns a Spliterator covering approximately half of the
233	<	* elements, guaranteed not to overlap with those subsequently
234	<	* returned by this Spliterator.  After invoking this method,
235	<	* the current Spliterator will <em>not</em> produce any of
272	<	* the elements of the returned Spliterator, but the two
273	<	* Spliterators together will produce all of the elements that
274	<	* would have been produced by this Spliterator had this
275	<	* method not been called. The exact number of elements
276	<	* produced by the returned Spliterator is not guaranteed, and
277	<	* may be zero (i.e., with {@code hasNext()} reporting {@code
278	<	* false}) if this Spliterator cannot be further split.
279	<	*
280	<	* @return a Spliterator covering approximately half of the
281	<	* elements
282	<	* @throws IllegalStateException if this Spliterator has
283	<	* already commenced traversing elements
232	>	* If possible, returns a new spliterator covering
233	>	* approximately one half of the elements, which will not be
234	>	* covered by this spliterator. Returns null if cannot be
235	>	* split.
236		*/
237	<	Spliterator<T> split();
286	<	}
287	<
288	<	/**
289	<	* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
290	<	* which additions may optionally be enabled by mapping to a
291	<	* common value.  This class cannot be directly instantiated. See
292	<	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
293	<	* {@link #newKeySet(int)}.
294	<	*
295	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
296	<	* that will never throw {@link ConcurrentModificationException},
297	<	* and guarantees to traverse elements as they existed upon
298	<	* construction of the iterator, and may (but is not guaranteed to)
299	<	* reflect any modifications subsequent to construction.
300	<	*/
301	<	public static class KeySetView<K,V> extends CHMView<K,V> implements Set<K>, java.io.Serializable {
302	<	private static final long serialVersionUID = 7249069246763182397L;
303	<	private final V value;
304	<	KeySetView(ConcurrentHashMapV8<K, V> map, V value) {  // non-public
305	<	super(map);
306	<	this.value = value;
307	<	}
308	<
237	>	ConcurrentHashMapSpliterator<T> trySplit();
238		/**
239	<	* Returns the map backing this view.
240	<	*
312	<	* @return the map backing this view
239	>	* Returns an estimate of the number of elements covered by
240	>	* this Spliterator.
241		*/
242	<	public ConcurrentHashMapV8<K,V> getMap() { return map; }
242	>	long estimateSize();
243
244	<	/**
245	<	* Returns the default mapped value for additions,
246	<	* or {@code null} if additions are not supported.
247	<	*
248	<	* @return the default mapped value for additions, or {@code null}
321	<	* if not supported.
322	<	*/
323	<	public V getMappedValue() { return value; }
244	>	/** Applies the action to each untraversed element */
245	>	void forEachRemaining(Action<? super T> action);
246	>	/** If an element remains, applies the action and returns true. */
247	>	boolean tryAdvance(Action<? super T> action);
248	>	}
249
250	<	// implement Set API
250	>	// Sams
251	>	/** Interface describing a void action of one argument */
252	>	public interface Action<A> { void apply(A a); }
253	>	/** Interface describing a void action of two arguments */
254	>	public interface BiAction<A,B> { void apply(A a, B b); }
255	>	/** Interface describing a function of one argument */
256	>	public interface Fun<A,T> { T apply(A a); }
257	>	/** Interface describing a function of two arguments */
258	>	public interface BiFun<A,B,T> { T apply(A a, B b); }
259	>	/** Interface describing a function mapping its argument to a double */
260	>	public interface ObjectToDouble<A> { double apply(A a); }
261	>	/** Interface describing a function mapping its argument to a long */
262	>	public interface ObjectToLong<A> { long apply(A a); }
263	>	/** Interface describing a function mapping its argument to an int */
264	>	public interface ObjectToInt<A> {int apply(A a); }
265	>	/** Interface describing a function mapping two arguments to a double */
266	>	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
267	>	/** Interface describing a function mapping two arguments to a long */
268	>	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
269	>	/** Interface describing a function mapping two arguments to an int */
270	>	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
271	>	/** Interface describing a function mapping two doubles to a double */
272	>	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
273	>	/** Interface describing a function mapping two longs to a long */
274	>	public interface LongByLongToLong { long apply(long a, long b); }
275	>	/** Interface describing a function mapping two ints to an int */
276	>	public interface IntByIntToInt { int apply(int a, int b); }
277
327	–	public boolean contains(Object o) { return map.containsKey(o); }
328	–	public boolean remove(Object o)   { return map.remove(o) != null; }
329	–	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
330	–	public boolean add(K e) {
331	–	V v;
332	–	if ((v = value) == null)
333	–	throw new UnsupportedOperationException();
334	–	if (e == null)
335	–	throw new NullPointerException();
336	–	return map.internalPutIfAbsent(e, v) == null;
337	–	}
338	–	public boolean addAll(Collection<? extends K> c) {
339	–	boolean added = false;
340	–	V v;
341	–	if ((v = value) == null)
342	–	throw new UnsupportedOperationException();
343	–	for (K e : c) {
344	–	if (e == null)
345	–	throw new NullPointerException();
346	–	if (map.internalPutIfAbsent(e, v) == null)
347	–	added = true;
348	–	}
349	–	return added;
350	–	}
351	–	public boolean equals(Object o) {
352	–	Set<?> c;
353	–	return ((o instanceof Set) &&
354	–	((c = (Set<?>)o) == this ||
355	–	(containsAll(c) && c.containsAll(this))));
356	–	}
357	–	}
278
279		/*
280		* Overview:
#	Line 366 | Line 286 | public class ConcurrentHashMapV8<K, V>
286		* the same or better than java.util.HashMap, and to support high
287		* initial insertion rates on an empty table by many threads.
288		*
289	<	* Each key-value mapping is held in a Node.  Because Node fields
290	<	* can contain special values, they are defined using plain Object
291	<	* types. Similarly in turn, all internal methods that use them
292	<	* work off Object types. And similarly, so do the internal
293	<	* methods of auxiliary iterator and view classes.  All public
294	<	* generic typed methods relay in/out of these internal methods,
295	<	* supplying null-checks and casts as needed. This also allows
296	<	* many of the public methods to be factored into a smaller number
297	<	* of internal methods (although sadly not so for the five
298	<	* variants of put-related operations). The validation-based
299	<	* approach explained below leads to a lot of code sprawl because
300	<	* retry-control precludes factoring into smaller methods.
289	>	* This map usually acts as a binned (bucketed) hash table.  Each
290	>	* key-value mapping is held in a Node.  Most nodes are instances
291	>	* of the basic Node class with hash, key, value, and next
292	>	* fields. However, various subclasses exist: TreeNodes are
293	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
294	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
295	>	* of bins during resizing. ReservationNodes are used as
296	>	* placeholders while establishing values in computeIfAbsent and
297	>	* related methods.  The types TreeBin, ForwardingNode, and
298	>	* ReservationNode do not hold normal user keys, values, or
299	>	* hashes, and are readily distinguishable during search etc
300	>	* because they have negative hash fields and null key and value
301	>	* fields. (These special nodes are either uncommon or transient,
302	>	* so the impact of carrying around some unused fields is
303	>	* insignificant.)
304		*
305		* The table is lazily initialized to a power-of-two size upon the
306		* first insertion.  Each bin in the table normally contains a
#	Line 385 | Line 308 | public class ConcurrentHashMapV8<K, V>
308		* Table accesses require volatile/atomic reads, writes, and
309		* CASes.  Because there is no other way to arrange this without
310		* adding further indirections, we use intrinsics
311	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
312	<	* are always accurately traversable under volatile reads, so long
313	<	* as lookups check hash code and non-nullness of value before
314	<	* checking key equality.
315	<	*
316	<	* We use the top two bits of Node hash fields for control
394	<	* purposes -- they are available anyway because of addressing
395	<	* constraints.  As explained further below, these top bits are
396	<	* used as follows:
397	<	*  00 - Normal
398	<	*  01 - Locked
399	<	*  11 - Locked and may have a thread waiting for lock
400	<	*  10 - Node is a forwarding node
401	<	*
402	<	* The lower 30 bits of each Node's hash field contain a
403	<	* transformation of the key's hash code, except for forwarding
404	<	* nodes, for which the lower bits are zero (and so always have
405	<	* hash field == MOVED).
311	>	* (sun.misc.Unsafe) operations.
312	>	*
313	>	* We use the top (sign) bit of Node hash fields for control
314	>	* purposes -- it is available anyway because of addressing
315	>	* constraints.  Nodes with negative hash fields are specially
316	>	* handled or ignored in map methods.
317		*
318		* Insertion (via put or its variants) of the first node in an
319		* empty bin is performed by just CASing it to the bin.  This is
#	Line 411 | Line 322 | public class ConcurrentHashMapV8<K, V>
322		* delete, and replace) require locks.  We do not want to waste
323		* the space required to associate a distinct lock object with
324		* each bin, so instead use the first node of a bin list itself as
325	<	* a lock. Blocking support for these locks relies on the builtin
326	<	* "synchronized" monitors.  However, we also need a tryLock
416	<	* construction, so we overlay these by using bits of the Node
417	<	* hash field for lock control (see above), and so normally use
418	<	* builtin monitors only for blocking and signalling using
419	<	* wait/notifyAll constructions. See Node.tryAwaitLock.
325	>	* a lock. Locking support for these locks relies on builtin
326	>	* "synchronized" monitors.
327		*
328		* Using the first node of a list as a lock does not by itself
329		* suffice though: When a node is locked, any update must first
330		* validate that it is still the first node after locking it, and
331		* retry if not. Because new nodes are always appended to lists,
332		* once a node is first in a bin, it remains first until deleted
333	<	* or the bin becomes invalidated (upon resizing).  However,
427	<	* operations that only conditionally update may inspect nodes
428	<	* until the point of update. This is a converse of sorts to the
429	<	* lazy locking technique described by Herlihy & Shavit.
333	>	* or the bin becomes invalidated (upon resizing).
334		*
335		* The main disadvantage of per-bin locks is that other update
336		* operations on other nodes in a bin list protected by the same
#	Line 459 | Line 363 | public class ConcurrentHashMapV8<K, V>
363		* sometimes deviate significantly from uniform randomness.  This
364		* includes the case when N > (1<<30), so some keys MUST collide.
365		* Similarly for dumb or hostile usages in which multiple keys are
366	<	* designed to have identical hash codes. Also, although we guard
367	<	* against the worst effects of this (see method spread), sets of
368	<	* hashes may differ only in bits that do not impact their bin
369	<	* index for a given power-of-two mask.  So we use a secondary
370	<	* strategy that applies when the number of nodes in a bin exceeds
371	<	* a threshold, and at least one of the keys implements
468	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
469	<	* (a specialized form of red-black trees), bounding search time
470	<	* to O(log N).  Each search step in a TreeBin is around twice as
366	>	* designed to have identical hash codes or ones that differs only
367	>	* in masked-out high bits. So we use a secondary strategy that
368	>	* applies when the number of nodes in a bin exceeds a
369	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
370	>	* specialized form of red-black trees), bounding search time to
371	>	* O(log N).  Each search step in a TreeBin is at least twice as
372		* slow as in a regular list, but given that N cannot exceed
373		* (1<<64) (before running out of addresses) this bounds search
374		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 478 | Line 379 | public class ConcurrentHashMapV8<K, V>
379		* iterators in the same way.
380		*
381		* The table is resized when occupancy exceeds a percentage
382	<	* threshold (nominally, 0.75, but see below).  Only a single
383	<	* thread performs the resize (using field "sizeCtl", to arrange
384	<	* exclusion), but the table otherwise remains usable for reads
385	<	* and updates. Resizing proceeds by transferring bins, one by
386	<	* one, from the table to the next table.  Because we are using
387	<	* power-of-two expansion, the elements from each bin must either
388	<	* stay at same index, or move with a power of two offset. We
389	<	* eliminate unnecessary node creation by catching cases where old
390	<	* nodes can be reused because their next fields won't change.  On
391	<	* average, only about one-sixth of them need cloning when a table
392	<	* doubles. The nodes they replace will be garbage collectable as
393	<	* soon as they are no longer referenced by any reader thread that
394	<	* may be in the midst of concurrently traversing table.  Upon
395	<	* transfer, the old table bin contains only a special forwarding
396	<	* node (with hash field "MOVED") that contains the next table as
397	<	* its key. On encountering a forwarding node, access and update
398	<	* operations restart, using the new table.
399	<	*
400	<	* Each bin transfer requires its bin lock. However, unlike other
401	<	* cases, a transfer can skip a bin if it fails to acquire its
402	<	* lock, and revisit it later (unless it is a TreeBin). Method
403	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
404	<	* have been skipped because of failure to acquire a lock, and
405	<	* blocks only if none are available (i.e., only very rarely).
406	<	* The transfer operation must also ensure that all accessible
407	<	* bins in both the old and new table are usable by any traversal.
408	<	* When there are no lock acquisition failures, this is arranged
409	<	* simply by proceeding from the last bin (table.length - 1) up
410	<	* towards the first.  Upon seeing a forwarding node, traversals
411	<	* (see class Iter) arrange to move to the new table
412	<	* without revisiting nodes.  However, when any node is skipped
413	<	* during a transfer, all earlier table bins may have become
414	<	* visible, so are initialized with a reverse-forwarding node back
415	<	* to the old table until the new ones are established. (This
416	<	* sometimes requires transiently locking a forwarding node, which
417	<	* is possible under the above encoding.) These more expensive
418	<	* mechanics trigger only when necessary.
382	>	* threshold (nominally, 0.75, but see below).  Any thread
383	>	* noticing an overfull bin may assist in resizing after the
384	>	* initiating thread allocates and sets up the replacement array.
385	>	* However, rather than stalling, these other threads may proceed
386	>	* with insertions etc.  The use of TreeBins shields us from the
387	>	* worst case effects of overfilling while resizes are in
388	>	* progress.  Resizing proceeds by transferring bins, one by one,
389	>	* from the table to the next table. However, threads claim small
390	>	* blocks of indices to transfer (via field transferIndex) before
391	>	* doing so, reducing contention.  A generation stamp in field
392	>	* sizeCtl ensures that resizings do not overlap. Because we are
393	>	* using power-of-two expansion, the elements from each bin must
394	>	* either stay at same index, or move with a power of two
395	>	* offset. We eliminate unnecessary node creation by catching
396	>	* cases where old nodes can be reused because their next fields
397	>	* won't change.  On average, only about one-sixth of them need
398	>	* cloning when a table doubles. The nodes they replace will be
399	>	* garbage collectable as soon as they are no longer referenced by
400	>	* any reader thread that may be in the midst of concurrently
401	>	* traversing table.  Upon transfer, the old table bin contains
402	>	* only a special forwarding node (with hash field "MOVED") that
403	>	* contains the next table as its key. On encountering a
404	>	* forwarding node, access and update operations restart, using
405	>	* the new table.
406	>	*
407	>	* Each bin transfer requires its bin lock, which can stall
408	>	* waiting for locks while resizing. However, because other
409	>	* threads can join in and help resize rather than contend for
410	>	* locks, average aggregate waits become shorter as resizing
411	>	* progresses.  The transfer operation must also ensure that all
412	>	* accessible bins in both the old and new table are usable by any
413	>	* traversal.  This is arranged in part by proceeding from the
414	>	* last bin (table.length - 1) up towards the first.  Upon seeing
415	>	* a forwarding node, traversals (see class Traverser) arrange to
416	>	* move to the new table without revisiting nodes.  To ensure that
417	>	* no intervening nodes are skipped even when moved out of order,
418	>	* a stack (see class TableStack) is created on first encounter of
419	>	* a forwarding node during a traversal, to maintain its place if
420	>	* later processing the current table. The need for these
421	>	* save/restore mechanics is relatively rare, but when one
422	>	* forwarding node is encountered, typically many more will be.
423	>	* So Traversers use a simple caching scheme to avoid creating so
424	>	* many new TableStack nodes. (Thanks to Peter Levart for
425	>	* suggesting use of a stack here.)
426		*
427		* The traversal scheme also applies to partial traversals of
428		* ranges of bins (via an alternate Traverser constructor)
#	Line 529 | Line 437 | public class ConcurrentHashMapV8<K, V>
437		* These cases attempt to override the initial capacity settings,
438		* but harmlessly fail to take effect in cases of races.
439		*
440	<	* The element count is maintained using a LongAdder, which avoids
441	<	* contention on updates but can encounter cache thrashing if read
442	<	* too frequently during concurrent access. To avoid reading so
443	<	* often, resizing is attempted either when a bin lock is
444	<	* contended, or upon adding to a bin already holding two or more
445	<	* nodes (checked before adding in the xIfAbsent methods, after
446	<	* adding in others). Under uniform hash distributions, the
447	<	* probability of this occurring at threshold is around 13%,
448	<	* meaning that only about 1 in 8 puts check threshold (and after
449	<	* resizing, many fewer do so). But this approximation has high
450	<	* variance for small table sizes, so we check on any collision
451	<	* for sizes <= 64. The bulk putAll operation further reduces
452	<	* contention by only committing count updates upon these size
453	<	* checks.
440	>	* The element count is maintained using a specialization of
441	>	* LongAdder. We need to incorporate a specialization rather than
442	>	* just use a LongAdder in order to access implicit
443	>	* contention-sensing that leads to creation of multiple
444	>	* CounterCells.  The counter mechanics avoid contention on
445	>	* updates but can encounter cache thrashing if read too
446	>	* frequently during concurrent access. To avoid reading so often,
447	>	* resizing under contention is attempted only upon adding to a
448	>	* bin already holding two or more nodes. Under uniform hash
449	>	* distributions, the probability of this occurring at threshold
450	>	* is around 13%, meaning that only about 1 in 8 puts check
451	>	* threshold (and after resizing, many fewer do so).
452	>	*
453	>	* TreeBins use a special form of comparison for search and
454	>	* related operations (which is the main reason we cannot use
455	>	* existing collections such as TreeMaps). TreeBins contain
456	>	* Comparable elements, but may contain others, as well as
457	>	* elements that are Comparable but not necessarily Comparable for
458	>	* the same T, so we cannot invoke compareTo among them. To handle
459	>	* this, the tree is ordered primarily by hash value, then by
460	>	* Comparable.compareTo order if applicable.  On lookup at a node,
461	>	* if elements are not comparable or compare as 0 then both left
462	>	* and right children may need to be searched in the case of tied
463	>	* hash values. (This corresponds to the full list search that
464	>	* would be necessary if all elements were non-Comparable and had
465	>	* tied hashes.) On insertion, to keep a total ordering (or as
466	>	* close as is required here) across rebalancings, we compare
467	>	* classes and identityHashCodes as tie-breakers. The red-black
468	>	* balancing code is updated from pre-jdk-collections
469	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
470	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
471	>	* Algorithms" (CLR).
472	>	*
473	>	* TreeBins also require an additional locking mechanism.  While
474	>	* list traversal is always possible by readers even during
475	>	* updates, tree traversal is not, mainly because of tree-rotations
476	>	* that may change the root node and/or its linkages.  TreeBins
477	>	* include a simple read-write lock mechanism parasitic on the
478	>	* main bin-synchronization strategy: Structural adjustments
479	>	* associated with an insertion or removal are already bin-locked
480	>	* (and so cannot conflict with other writers) but must wait for
481	>	* ongoing readers to finish. Since there can be only one such
482	>	* waiter, we use a simple scheme using a single "waiter" field to
483	>	* block writers.  However, readers need never block.  If the root
484	>	* lock is held, they proceed along the slow traversal path (via
485	>	* next-pointers) until the lock becomes available or the list is
486	>	* exhausted, whichever comes first. These cases are not fast, but
487	>	* maximize aggregate expected throughput.
488		*
489		* Maintaining API and serialization compatibility with previous
490		* versions of this class introduces several oddities. Mainly: We
#	Line 552 | Line 494 | public class ConcurrentHashMapV8<K, V>
494		* time that we can guarantee to honor it.) We also declare an
495		* unused "Segment" class that is instantiated in minimal form
496		* only when serializing.
497	+	*
498	+	* Also, solely for compatibility with previous versions of this
499	+	* class, it extends AbstractMap, even though all of its methods
500	+	* are overridden, so it is just useless baggage.
501	+	*
502	+	* This file is organized to make things a little easier to follow
503	+	* while reading than they might otherwise: First the main static
504	+	* declarations and utilities, then fields, then main public
505	+	* methods (with a few factorings of multiple public methods into
506	+	* internal ones), then sizing methods, trees, traversers, and
507	+	* bulk operations.
508		*/
509
510		/* ---------------- Constants -------------- */
#	Line 593 | Line 546 | public class ConcurrentHashMapV8<K, V>
546		private static final float LOAD_FACTOR = 0.75f;
547
548		/**
549	<	* The buffer size for skipped bins during transfers. The
550	<	* value is arbitrary but should be large enough to avoid
551	<	* most locking stalls during resizes.
549	>	* The bin count threshold for using a tree rather than list for a
550	>	* bin.  Bins are converted to trees when adding an element to a
551	>	* bin with at least this many nodes. The value must be greater
552	>	* than 2, and should be at least 8 to mesh with assumptions in
553	>	* tree removal about conversion back to plain bins upon
554	>	* shrinkage.
555		*/
556	<	private static final int TRANSFER_BUFFER_SIZE = 32;
556	>	static final int TREEIFY_THRESHOLD = 8;
557
558		/**
559	<	* The bin count threshold for using a tree rather than list for a
560	<	* bin.  The value reflects the approximate break-even point for
561	<	* using tree-based operations.
559	>	* The bin count threshold for untreeifying a (split) bin during a
560	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
561	>	* most 6 to mesh with shrinkage detection under removal.
562		*/
563	<	private static final int TREE_THRESHOLD = 8;
563	>	static final int UNTREEIFY_THRESHOLD = 6;
564
565	<	/*
566	<	* Encodings for special uses of Node hash fields. See above for
567	<	* explanation.
565	>	/**
566	>	* The smallest table capacity for which bins may be treeified.
567	>	* (Otherwise the table is resized if too many nodes in a bin.)
568	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
569	>	* conflicts between resizing and treeification thresholds.
570		*/
571	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
614	<	static final int LOCKED    = 0x40000000; // set/tested only as a bit
615	<	static final int WAITING   = 0xc0000000; // both bits set/tested together
616	<	static final int HASH_BITS = 0x3fffffff; // usable bits of normal node hash
617	<
618	<	/* ---------------- Fields -------------- */
571	>	static final int MIN_TREEIFY_CAPACITY = 64;
572
573		/**
574	<	* The array of bins. Lazily initialized upon first insertion.
575	<	* Size is always a power of two. Accessed directly by iterators.
574	>	* Minimum number of rebinnings per transfer step. Ranges are
575	>	* subdivided to allow multiple resizer threads.  This value
576	>	* serves as a lower bound to avoid resizers encountering
577	>	* excessive memory contention.  The value should be at least
578	>	* DEFAULT_CAPACITY.
579		*/
580	<	transient volatile Node[] table;
580	>	private static final int MIN_TRANSFER_STRIDE = 16;
581
582		/**
583	<	* The counter maintaining number of elements.
583	>	* The number of bits used for generation stamp in sizeCtl.
584	>	* Must be at least 6 for 32bit arrays.
585		*/
586	<	private transient final LongAdder counter;
586	>	private static int RESIZE_STAMP_BITS = 16;
587
588		/**
589	<	* Table initialization and resizing control.  When negative, the
590	<	* table is being initialized or resized. Otherwise, when table is
634	<	* null, holds the initial table size to use upon creation, or 0
635	<	* for default. After initialization, holds the next element count
636	<	* value upon which to resize the table.
589	>	* The maximum number of threads that can help resize.
590	>	* Must fit in 32 - RESIZE_STAMP_BITS bits.
591		*/
592	<	private transient volatile int sizeCtl;
639	<
640	<	// views
641	<	private transient KeySetView<K,V> keySet;
642	<	private transient Values<K,V> values;
643	<	private transient EntrySet<K,V> entrySet;
644	<
645	<	/** For serialization compatibility. Null unless serialized; see below */
646	<	private Segment<K,V>[] segments;
592	>	private static final int MAX_RESIZERS = (1 << (32 - RESIZE_STAMP_BITS)) - 1;
593
594	<	/* ---------------- Table element access -------------- */
594	>	/**
595	>	* The bit shift for recording size stamp in sizeCtl.
596	>	*/
597	>	private static final int RESIZE_STAMP_SHIFT = 32 - RESIZE_STAMP_BITS;
598
599		/*
600	<	* Volatile access methods are used for table elements as well as
652	<	* elements of in-progress next table while resizing.  Uses are
653	<	* null checked by callers, and implicitly bounds-checked, relying
654	<	* on the invariants that tab arrays have non-zero size, and all
655	<	* indices are masked with (tab.length - 1) which is never
656	<	* negative and always less than length. Note that, to be correct
657	<	* wrt arbitrary concurrency errors by users, bounds checks must
658	<	* operate on local variables, which accounts for some odd-looking
659	<	* inline assignments below.
600	>	* Encodings for Node hash fields. See above for explanation.
601		*/
602	<
603	<	static final Node tabAt(Node[] tab, int i) { // used by Iter
604	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
605	<	}
606	<
607	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
608	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
609	<	}
610	<
611	<	private static final void setTabAt(Node[] tab, int i, Node v) {
612	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
613	<	}
602	>	static final int MOVED     = -1; // hash for forwarding nodes
603	>	static final int TREEBIN   = -2; // hash for roots of trees
604	>	static final int RESERVED  = -3; // hash for transient reservations
605	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
606	>
607	>	/** Number of CPUS, to place bounds on some sizings */
608	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
609	>
610	>	/** For serialization compatibility. */
611	>	private static final ObjectStreamField[] serialPersistentFields = {
612	>	new ObjectStreamField("segments", Segment[].class),
613	>	new ObjectStreamField("segmentMask", Integer.TYPE),
614	>	new ObjectStreamField("segmentShift", Integer.TYPE)
615	>	};
616
617		/* ---------------- Nodes -------------- */
618
619		/**
620	<	* Key-value entry. Note that this is never exported out as a
621	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
622	<	* field of MOVED are special, and do not contain user keys or
623	<	* values.  Otherwise, keys are never null, and null val fields
624	<	* indicate that a node is in the process of being deleted or
625	<	* created. For purposes of read-only access, a key may be read
626	<	* before a val, but can only be used after checking val to be
627	<	* non-null.
628	<	*/
629	<	static class Node {
630	<	volatile int hash;
631	<	final Object key;
689	<	volatile Object val;
690	<	volatile Node next;
620	>	* Key-value entry.  This class is never exported out as a
621	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
622	>	* MapEntry below), but can be used for read-only traversals used
623	>	* in bulk tasks.  Subclasses of Node with a negative hash field
624	>	* are special, and contain null keys and values (but are never
625	>	* exported).  Otherwise, keys and vals are never null.
626	>	*/
627	>	static class Node<K,V> implements Map.Entry<K,V> {
628	>	final int hash;
629	>	final K key;
630	>	volatile V val;
631	>	volatile Node<K,V> next;
632
633	<	Node(int hash, Object key, Object val, Node next) {
633	>	Node(int hash, K key, V val, Node<K,V> next) {
634		this.hash = hash;
635		this.key = key;
636		this.val = val;
637		this.next = next;
638		}
639
640	<	/** CompareAndSet the hash field */
641	<	final boolean casHash(int cmp, int val) {
642	<	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
643	<	}
644	<
645	<	/** The number of spins before blocking for a lock */
705	<	static final int MAX_SPINS =
706	<	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
707	<
708	<	/**
709	<	* Spins a while if LOCKED bit set and this node is the first
710	<	* of its bin, and then sets WAITING bits on hash field and
711	<	* blocks (once) if they are still set.  It is OK for this
712	<	* method to return even if lock is not available upon exit,
713	<	* which enables these simple single-wait mechanics.
714	<	*
715	<	* The corresponding signalling operation is performed within
716	<	* callers: Upon detecting that WAITING has been set when
717	<	* unlocking lock (via a failed CAS from non-waiting LOCKED
718	<	* state), unlockers acquire the sync lock and perform a
719	<	* notifyAll.
720	<	*
721	<	* The initial sanity check on tab and bounds is not currently
722	<	* necessary in the only usages of this method, but enables
723	<	* use in other future contexts.
724	<	*/
725	<	final void tryAwaitLock(Node[] tab, int i) {
726	<	if (tab != null && i >= 0 && i < tab.length) { // sanity check
727	<	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
728	<	int spins = MAX_SPINS, h;
729	<	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
730	<	if (spins >= 0) {
731	<	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
732	<	if (r >= 0 && --spins == 0)
733	<	Thread.yield();  // yield before block
734	<	}
735	<	else if (casHash(h, h | WAITING)) {
736	<	synchronized (this) {
737	<	if (tabAt(tab, i) == this &&
738	<	(hash & WAITING) == WAITING) {
739	<	try {
740	<	wait();
741	<	} catch (InterruptedException ie) {
742	<	Thread.currentThread().interrupt();
743	<	}
744	<	}
745	<	else
746	<	notifyAll(); // possibly won race vs signaller
747	<	}
748	<	break;
749	<	}
750	<	}
751	<	}
752	<	}
753	<
754	<	// Unsafe mechanics for casHash
755	<	private static final sun.misc.Unsafe UNSAFE;
756	<	private static final long hashOffset;
757	<
758	<	static {
759	<	try {
760	<	UNSAFE = getUnsafe();
761	<	Class<?> k = Node.class;
762	<	hashOffset = UNSAFE.objectFieldOffset
763	<	(k.getDeclaredField("hash"));
764	<	} catch (Exception e) {
765	<	throw new Error(e);
766	<	}
767	<	}
768	<	}
769	<
770	<	/* ---------------- TreeBins -------------- */
771	<
772	<	/**
773	<	* Nodes for use in TreeBins
774	<	*/
775	<	static final class TreeNode extends Node {
776	<	TreeNode parent;  // red-black tree links
777	<	TreeNode left;
778	<	TreeNode right;
779	<	TreeNode prev;    // needed to unlink next upon deletion
780	<	boolean red;
781	<
782	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
783	<	super(hash, key, val, next);
784	<	this.parent = parent;
785	<	}
786	<	}
787	<
788	<	/**
789	<	* A specialized form of red-black tree for use in bins
790	<	* whose size exceeds a threshold.
791	<	*
792	<	* TreeBins use a special form of comparison for search and
793	<	* related operations (which is the main reason we cannot use
794	<	* existing collections such as TreeMaps). TreeBins contain
795	<	* Comparable elements, but may contain others, as well as
796	<	* elements that are Comparable but not necessarily Comparable<T>
797	<	* for the same T, so we cannot invoke compareTo among them. To
798	<	* handle this, the tree is ordered primarily by hash value, then
799	<	* by getClass().getName() order, and then by Comparator order
800	<	* among elements of the same class.  On lookup at a node, if
801	<	* elements are not comparable or compare as 0, both left and
802	<	* right children may need to be searched in the case of tied hash
803	<	* values. (This corresponds to the full list search that would be
804	<	* necessary if all elements were non-Comparable and had tied
805	<	* hashes.)  The red-black balancing code is updated from
806	<	* pre-jdk-collections
807	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
808	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
809	<	* Algorithms" (CLR).
810	<	*
811	<	* TreeBins also maintain a separate locking discipline than
812	<	* regular bins. Because they are forwarded via special MOVED
813	<	* nodes at bin heads (which can never change once established),
814	<	* we cannot use those nodes as locks. Instead, TreeBin
815	<	* extends AbstractQueuedSynchronizer to support a simple form of
816	<	* read-write lock. For update operations and table validation,
817	<	* the exclusive form of lock behaves in the same way as bin-head
818	<	* locks. However, lookups use shared read-lock mechanics to allow
819	<	* multiple readers in the absence of writers.  Additionally,
820	<	* these lookups do not ever block: While the lock is not
821	<	* available, they proceed along the slow traversal path (via
822	<	* next-pointers) until the lock becomes available or the list is
823	<	* exhausted, whichever comes first. (These cases are not fast,
824	<	* but maximize aggregate expected throughput.)  The AQS mechanics
825	<	* for doing this are straightforward.  The lock state is held as
826	<	* AQS getState().  Read counts are negative; the write count (1)
827	<	* is positive.  There are no signalling preferences among readers
828	<	* and writers. Since we don't need to export full Lock API, we
829	<	* just override the minimal AQS methods and use them directly.
830	<	*/
831	<	static final class TreeBin extends AbstractQueuedSynchronizer {
832	<	private static final long serialVersionUID = 2249069246763182397L;
833	<	transient TreeNode root;  // root of tree
834	<	transient TreeNode first; // head of next-pointer list
835	<
836	<	/* AQS overrides */
837	<	public final boolean isHeldExclusively() { return getState() > 0; }
838	<	public final boolean tryAcquire(int ignore) {
839	<	if (compareAndSetState(0, 1)) {
840	<	setExclusiveOwnerThread(Thread.currentThread());
841	<	return true;
842	<	}
843	<	return false;
844	<	}
845	<	public final boolean tryRelease(int ignore) {
846	<	setExclusiveOwnerThread(null);
847	<	setState(0);
848	<	return true;
849	<	}
850	<	public final int tryAcquireShared(int ignore) {
851	<	for (int c;;) {
852	<	if ((c = getState()) > 0)
853	<	return -1;
854	<	if (compareAndSetState(c, c -1))
855	<	return 1;
856	<	}
857	<	}
858	<	public final boolean tryReleaseShared(int ignore) {
859	<	int c;
860	<	do {} while (!compareAndSetState(c = getState(), c + 1));
861	<	return c == -1;
862	<	}
863	<
864	<	/** From CLR */
865	<	private void rotateLeft(TreeNode p) {
866	<	if (p != null) {
867	<	TreeNode r = p.right, pp, rl;
868	<	if ((rl = p.right = r.left) != null)
869	<	rl.parent = p;
870	<	if ((pp = r.parent = p.parent) == null)
871	<	root = r;
872	<	else if (pp.left == p)
873	<	pp.left = r;
874	<	else
875	<	pp.right = r;
876	<	r.left = p;
877	<	p.parent = r;
878	<	}
879	<	}
880	<
881	<	/** From CLR */
882	<	private void rotateRight(TreeNode p) {
883	<	if (p != null) {
884	<	TreeNode l = p.left, pp, lr;
885	<	if ((lr = p.left = l.right) != null)
886	<	lr.parent = p;
887	<	if ((pp = l.parent = p.parent) == null)
888	<	root = l;
889	<	else if (pp.right == p)
890	<	pp.right = l;
891	<	else
892	<	pp.left = l;
893	<	l.right = p;
894	<	p.parent = l;
895	<	}
896	<	}
897	<
898	<	/**
899	<	* Returns the TreeNode (or null if not found) for the given key
900	<	* starting at given root.
901	<	*/
902	<	@SuppressWarnings("unchecked") final TreeNode getTreeNode
903	<	(int h, Object k, TreeNode p) {
904	<	Class<?> c = k.getClass();
905	<	while (p != null) {
906	<	int dir, ph;  Object pk; Class<?> pc;
907	<	if ((ph = p.hash) == h) {
908	<	if ((pk = p.key) == k || k.equals(pk))
909	<	return p;
910	<	if (c != (pc = pk.getClass()) ||
911	<	!(k instanceof Comparable) ||
912	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
913	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
914	<	TreeNode r = null, s = null, pl, pr;
915	<	if (dir >= 0) {
916	<	if ((pl = p.left) != null && h <= pl.hash)
917	<	s = pl;
918	<	}
919	<	else if ((pr = p.right) != null && h >= pr.hash)
920	<	s = pr;
921	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
922	<	return r;
923	<	}
924	<	}
925	<	else
926	<	dir = (h < ph) ? -1 : 1;
927	<	p = (dir > 0) ? p.right : p.left;
928	<	}
929	<	return null;
640	>	public final K getKey()     { return key; }
641	>	public final V getValue()   { return val; }
642	>	public final int hashCode() { return key.hashCode() ^ val.hashCode(); }
643	>	public final String toString() { return key + "=" + val; }
644	>	public final V setValue(V value) {
645	>	throw new UnsupportedOperationException();
646		}
647
648	<	/**
649	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
650	<	* read-lock to call getTreeNode, but during failure to get
651	<	* lock, searches along next links.
652	<	*/
653	<	final Object getValue(int h, Object k) {
654	<	Node r = null;
939	<	int c = getState(); // Must read lock state first
940	<	for (Node e = first; e != null; e = e.next) {
941	<	if (c <= 0 && compareAndSetState(c, c - 1)) {
942	<	try {
943	<	r = getTreeNode(h, k, root);
944	<	} finally {
945	<	releaseShared(0);
946	<	}
947	<	break;
948	<	}
949	<	else if ((e.hash & HASH_BITS) == h && k.equals(e.key)) {
950	<	r = e;
951	<	break;
952	<	}
953	<	else
954	<	c = getState();
955	<	}
956	<	return r == null ? null : r.val;
648	>	public final boolean equals(Object o) {
649	>	Object k, v, u; Map.Entry<?,?> e;
650	>	return ((o instanceof Map.Entry) &&
651	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
652	>	(v = e.getValue()) != null &&
653	>	(k == key || k.equals(key)) &&
654	>	(v == (u = val) || v.equals(u)));
655		}
656
657		/**
658	<	* Finds or adds a node.
961	<	* @return null if added
658	>	* Virtualized support for map.get(); overridden in subclasses.
659		*/
660	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
661	<	(int h, Object k, Object v) {
662	<	Class<?> c = k.getClass();
663	<	TreeNode pp = root, p = null;
664	<	int dir = 0;
665	<	while (pp != null) { // find existing node or leaf to insert at
666	<	int ph;  Object pk; Class<?> pc;
667	<	p = pp;
668	<	if ((ph = p.hash) == h) {
972	<	if ((pk = p.key) == k || k.equals(pk))
973	<	return p;
974	<	if (c != (pc = pk.getClass()) ||
975	<	!(k instanceof Comparable) ||
976	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
977	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
978	<	TreeNode r = null, s = null, pl, pr;
979	<	if (dir >= 0) {
980	<	if ((pl = p.left) != null && h <= pl.hash)
981	<	s = pl;
982	<	}
983	<	else if ((pr = p.right) != null && h >= pr.hash)
984	<	s = pr;
985	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
986	<	return r;
987	<	}
988	<	}
989	<	else
990	<	dir = (h < ph) ? -1 : 1;
991	<	pp = (dir > 0) ? p.right : p.left;
992	<	}
993	<
994	<	TreeNode f = first;
995	<	TreeNode x = first = new TreeNode(h, k, v, f, p);
996	<	if (p == null)
997	<	root = x;
998	<	else { // attach and rebalance; adapted from CLR
999	<	TreeNode xp, xpp;
1000	<	if (f != null)
1001	<	f.prev = x;
1002	<	if (dir <= 0)
1003	<	p.left = x;
1004	<	else
1005	<	p.right = x;
1006	<	x.red = true;
1007	<	while (x != null && (xp = x.parent) != null && xp.red &&
1008	<	(xpp = xp.parent) != null) {
1009	<	TreeNode xppl = xpp.left;
1010	<	if (xp == xppl) {
1011	<	TreeNode y = xpp.right;
1012	<	if (y != null && y.red) {
1013	<	y.red = false;
1014	<	xp.red = false;
1015	<	xpp.red = true;
1016	<	x = xpp;
1017	<	}
1018	<	else {
1019	<	if (x == xp.right) {
1020	<	rotateLeft(x = xp);
1021	<	xpp = (xp = x.parent) == null ? null : xp.parent;
1022	<	}
1023	<	if (xp != null) {
1024	<	xp.red = false;
1025	<	if (xpp != null) {
1026	<	xpp.red = true;
1027	<	rotateRight(xpp);
1028	<	}
1029	<	}
1030	<	}
1031	<	}
1032	<	else {
1033	<	TreeNode y = xppl;
1034	<	if (y != null && y.red) {
1035	<	y.red = false;
1036	<	xp.red = false;
1037	<	xpp.red = true;
1038	<	x = xpp;
1039	<	}
1040	<	else {
1041	<	if (x == xp.left) {
1042	<	rotateRight(x = xp);
1043	<	xpp = (xp = x.parent) == null ? null : xp.parent;
1044	<	}
1045	<	if (xp != null) {
1046	<	xp.red = false;
1047	<	if (xpp != null) {
1048	<	xpp.red = true;
1049	<	rotateLeft(xpp);
1050	<	}
1051	<	}
1052	<	}
1053	<	}
1054	<	}
1055	<	TreeNode r = root;
1056	<	if (r != null && r.red)
1057	<	r.red = false;
660	>	Node<K,V> find(int h, Object k) {
661	>	Node<K,V> e = this;
662	>	if (k != null) {
663	>	do {
664	>	K ek;
665	>	if (e.hash == h &&
666	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
667	>	return e;
668	>	} while ((e = e.next) != null);
669		}
670		return null;
671		}
1061	–
1062	–	/**
1063	–	* Removes the given node, that must be present before this
1064	–	* call.  This is messier than typical red-black deletion code
1065	–	* because we cannot swap the contents of an interior node
1066	–	* with a leaf successor that is pinned by "next" pointers
1067	–	* that are accessible independently of lock. So instead we
1068	–	* swap the tree linkages.
1069	–	*/
1070	–	final void deleteTreeNode(TreeNode p) {
1071	–	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
1072	–	TreeNode pred = p.prev;
1073	–	if (pred == null)
1074	–	first = next;
1075	–	else
1076	–	pred.next = next;
1077	–	if (next != null)
1078	–	next.prev = pred;
1079	–	TreeNode replacement;
1080	–	TreeNode pl = p.left;
1081	–	TreeNode pr = p.right;
1082	–	if (pl != null && pr != null) {
1083	–	TreeNode s = pr, sl;
1084	–	while ((sl = s.left) != null) // find successor
1085	–	s = sl;
1086	–	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
1087	–	TreeNode sr = s.right;
1088	–	TreeNode pp = p.parent;
1089	–	if (s == pr) { // p was s's direct parent
1090	–	p.parent = s;
1091	–	s.right = p;
1092	–	}
1093	–	else {
1094	–	TreeNode sp = s.parent;
1095	–	if ((p.parent = sp) != null) {
1096	–	if (s == sp.left)
1097	–	sp.left = p;
1098	–	else
1099	–	sp.right = p;
1100	–	}
1101	–	if ((s.right = pr) != null)
1102	–	pr.parent = s;
1103	–	}
1104	–	p.left = null;
1105	–	if ((p.right = sr) != null)
1106	–	sr.parent = p;
1107	–	if ((s.left = pl) != null)
1108	–	pl.parent = s;
1109	–	if ((s.parent = pp) == null)
1110	–	root = s;
1111	–	else if (p == pp.left)
1112	–	pp.left = s;
1113	–	else
1114	–	pp.right = s;
1115	–	replacement = sr;
1116	–	}
1117	–	else
1118	–	replacement = (pl != null) ? pl : pr;
1119	–	TreeNode pp = p.parent;
1120	–	if (replacement == null) {
1121	–	if (pp == null) {
1122	–	root = null;
1123	–	return;
1124	–	}
1125	–	replacement = p;
1126	–	}
1127	–	else {
1128	–	replacement.parent = pp;
1129	–	if (pp == null)
1130	–	root = replacement;
1131	–	else if (p == pp.left)
1132	–	pp.left = replacement;
1133	–	else
1134	–	pp.right = replacement;
1135	–	p.left = p.right = p.parent = null;
1136	–	}
1137	–	if (!p.red) { // rebalance, from CLR
1138	–	TreeNode x = replacement;
1139	–	while (x != null) {
1140	–	TreeNode xp, xpl;
1141	–	if (x.red || (xp = x.parent) == null) {
1142	–	x.red = false;
1143	–	break;
1144	–	}
1145	–	if (x == (xpl = xp.left)) {
1146	–	TreeNode sib = xp.right;
1147	–	if (sib != null && sib.red) {
1148	–	sib.red = false;
1149	–	xp.red = true;
1150	–	rotateLeft(xp);
1151	–	sib = (xp = x.parent) == null ? null : xp.right;
1152	–	}
1153	–	if (sib == null)
1154	–	x = xp;
1155	–	else {
1156	–	TreeNode sl = sib.left, sr = sib.right;
1157	–	if ((sr == null || !sr.red) &&
1158	–	(sl == null || !sl.red)) {
1159	–	sib.red = true;
1160	–	x = xp;
1161	–	}
1162	–	else {
1163	–	if (sr == null || !sr.red) {
1164	–	if (sl != null)
1165	–	sl.red = false;
1166	–	sib.red = true;
1167	–	rotateRight(sib);
1168	–	sib = (xp = x.parent) == null ? null : xp.right;
1169	–	}
1170	–	if (sib != null) {
1171	–	sib.red = (xp == null) ? false : xp.red;
1172	–	if ((sr = sib.right) != null)
1173	–	sr.red = false;
1174	–	}
1175	–	if (xp != null) {
1176	–	xp.red = false;
1177	–	rotateLeft(xp);
1178	–	}
1179	–	x = root;
1180	–	}
1181	–	}
1182	–	}
1183	–	else { // symmetric
1184	–	TreeNode sib = xpl;
1185	–	if (sib != null && sib.red) {
1186	–	sib.red = false;
1187	–	xp.red = true;
1188	–	rotateRight(xp);
1189	–	sib = (xp = x.parent) == null ? null : xp.left;
1190	–	}
1191	–	if (sib == null)
1192	–	x = xp;
1193	–	else {
1194	–	TreeNode sl = sib.left, sr = sib.right;
1195	–	if ((sl == null || !sl.red) &&
1196	–	(sr == null || !sr.red)) {
1197	–	sib.red = true;
1198	–	x = xp;
1199	–	}
1200	–	else {
1201	–	if (sl == null || !sl.red) {
1202	–	if (sr != null)
1203	–	sr.red = false;
1204	–	sib.red = true;
1205	–	rotateLeft(sib);
1206	–	sib = (xp = x.parent) == null ? null : xp.left;
1207	–	}
1208	–	if (sib != null) {
1209	–	sib.red = (xp == null) ? false : xp.red;
1210	–	if ((sl = sib.left) != null)
1211	–	sl.red = false;
1212	–	}
1213	–	if (xp != null) {
1214	–	xp.red = false;
1215	–	rotateRight(xp);
1216	–	}
1217	–	x = root;
1218	–	}
1219	–	}
1220	–	}
1221	–	}
1222	–	}
1223	–	if (p == replacement && (pp = p.parent) != null) {
1224	–	if (p == pp.left) // detach pointers
1225	–	pp.left = null;
1226	–	else if (p == pp.right)
1227	–	pp.right = null;
1228	–	p.parent = null;
1229	–	}
1230	–	}
672		}
673
674	<	/* ---------------- Collision reduction methods -------------- */
674	>	/* ---------------- Static utilities -------------- */
675
676		/**
677	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
678	<	* Because the table uses power-of-two masking, sets of hashes
679	<	* that vary only in bits above the current mask will always
680	<	* collide. (Among known examples are sets of Float keys holding
681	<	* consecutive whole numbers in small tables.)  To counter this,
682	<	* we apply a transform that spreads the impact of higher bits
677	>	* Spreads (XORs) higher bits of hash to lower and also forces top
678	>	* bit to 0. Because the table uses power-of-two masking, sets of
679	>	* hashes that vary only in bits above the current mask will
680	>	* always collide. (Among known examples are sets of Float keys
681	>	* holding consecutive whole numbers in small tables.)  So we
682	>	* apply a transform that spreads the impact of higher bits
683		* downward. There is a tradeoff between speed, utility, and
684		* quality of bit-spreading. Because many common sets of hashes
685	<	* are already reasonably distributed across bits (so don't benefit
686	<	* from spreading), and because we use trees to handle large sets
687	<	* of collisions in bins, we don't need excessively high quality.
685	>	* are already reasonably distributed (so don't benefit from
686	>	* spreading), and because we use trees to handle large sets of
687	>	* collisions in bins, we just XOR some shifted bits in the
688	>	* cheapest possible way to reduce systematic lossage, as well as
689	>	* to incorporate impact of the highest bits that would otherwise
690	>	* never be used in index calculations because of table bounds.
691		*/
692	<	private static final int spread(int h) {
693	<	h ^= (h >>> 18) ^ (h >>> 12);
1250	<	return (h ^ (h >>> 10)) & HASH_BITS;
1251	<	}
1252	<
1253	<	/**
1254	<	* Replaces a list bin with a tree bin. Call only when locked.
1255	<	* Fails to replace if the given key is non-comparable or table
1256	<	* is, or needs, resizing.
1257	<	*/
1258	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
1259	<	if ((key instanceof Comparable) &&
1260	<	(tab.length >= MAXIMUM_CAPACITY || counter.sum() < (long)sizeCtl)) {
1261	<	TreeBin t = new TreeBin();
1262	<	for (Node e = tabAt(tab, index); e != null; e = e.next)
1263	<	t.putTreeNode(e.hash & HASH_BITS, e.key, e.val);
1264	<	setTabAt(tab, index, new Node(MOVED, t, null, null));
1265	<	}
1266	<	}
1267	<
1268	<	/* ---------------- Internal access and update methods -------------- */
1269	<
1270	<	/** Implementation for get and containsKey */
1271	<	private final Object internalGet(Object k) {
1272	<	int h = spread(k.hashCode());
1273	<	retry: for (Node[] tab = table; tab != null;) {
1274	<	Node e, p; Object ek, ev; int eh;      // locals to read fields once
1275	<	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1276	<	if ((eh = e.hash) == MOVED) {
1277	<	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1278	<	return ((TreeBin)ek).getValue(h, k);
1279	<	else {                        // restart with new table
1280	<	tab = (Node[])ek;
1281	<	continue retry;
1282	<	}
1283	<	}
1284	<	else if ((eh & HASH_BITS) == h && (ev = e.val) != null &&
1285	<	((ek = e.key) == k || k.equals(ek)))
1286	<	return ev;
1287	<	}
1288	<	break;
1289	<	}
1290	<	return null;
692	>	static final int spread(int h) {
693	>	return (h ^ (h >>> 16)) & HASH_BITS;
694		}
695
696		/**
1294	–	* Implementation for the four public remove/replace methods:
1295	–	* Replaces node value with v, conditional upon match of cv if
1296	–	* non-null.  If resulting value is null, delete.
1297	–	*/
1298	–	private final Object internalReplace(Object k, Object v, Object cv) {
1299	–	int h = spread(k.hashCode());
1300	–	Object oldVal = null;
1301	–	for (Node[] tab = table;;) {
1302	–	Node f; int i, fh; Object fk;
1303	–	if (tab == null ||
1304	–	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1305	–	break;
1306	–	else if ((fh = f.hash) == MOVED) {
1307	–	if ((fk = f.key) instanceof TreeBin) {
1308	–	TreeBin t = (TreeBin)fk;
1309	–	boolean validated = false;
1310	–	boolean deleted = false;
1311	–	t.acquire(0);
1312	–	try {
1313	–	if (tabAt(tab, i) == f) {
1314	–	validated = true;
1315	–	TreeNode p = t.getTreeNode(h, k, t.root);
1316	–	if (p != null) {
1317	–	Object pv = p.val;
1318	–	if (cv == null || cv == pv || cv.equals(pv)) {
1319	–	oldVal = pv;
1320	–	if ((p.val = v) == null) {
1321	–	deleted = true;
1322	–	t.deleteTreeNode(p);
1323	–	}
1324	–	}
1325	–	}
1326	–	}
1327	–	} finally {
1328	–	t.release(0);
1329	–	}
1330	–	if (validated) {
1331	–	if (deleted)
1332	–	counter.add(-1L);
1333	–	break;
1334	–	}
1335	–	}
1336	–	else
1337	–	tab = (Node[])fk;
1338	–	}
1339	–	else if ((fh & HASH_BITS) != h && f.next == null) // precheck
1340	–	break;                          // rules out possible existence
1341	–	else if ((fh & LOCKED) != 0) {
1342	–	checkForResize();               // try resizing if can't get lock
1343	–	f.tryAwaitLock(tab, i);
1344	–	}
1345	–	else if (f.casHash(fh, fh | LOCKED)) {
1346	–	boolean validated = false;
1347	–	boolean deleted = false;
1348	–	try {
1349	–	if (tabAt(tab, i) == f) {
1350	–	validated = true;
1351	–	for (Node e = f, pred = null;;) {
1352	–	Object ek, ev;
1353	–	if ((e.hash & HASH_BITS) == h &&
1354	–	((ev = e.val) != null) &&
1355	–	((ek = e.key) == k || k.equals(ek))) {
1356	–	if (cv == null || cv == ev || cv.equals(ev)) {
1357	–	oldVal = ev;
1358	–	if ((e.val = v) == null) {
1359	–	deleted = true;
1360	–	Node en = e.next;
1361	–	if (pred != null)
1362	–	pred.next = en;
1363	–	else
1364	–	setTabAt(tab, i, en);
1365	–	}
1366	–	}
1367	–	break;
1368	–	}
1369	–	pred = e;
1370	–	if ((e = e.next) == null)
1371	–	break;
1372	–	}
1373	–	}
1374	–	} finally {
1375	–	if (!f.casHash(fh | LOCKED, fh)) {
1376	–	f.hash = fh;
1377	–	synchronized (f) { f.notifyAll(); };
1378	–	}
1379	–	}
1380	–	if (validated) {
1381	–	if (deleted)
1382	–	counter.add(-1L);
1383	–	break;
1384	–	}
1385	–	}
1386	–	}
1387	–	return oldVal;
1388	–	}
1389	–
1390	–	/*
1391	–	* Internal versions of the six insertion methods, each a
1392	–	* little more complicated than the last. All have
1393	–	* the same basic structure as the first (internalPut):
1394	–	*  1. If table uninitialized, create
1395	–	*  2. If bin empty, try to CAS new node
1396	–	*  3. If bin stale, use new table
1397	–	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1398	–	*  5. Lock and validate; if valid, scan and add or update
1399	–	*
1400	–	* The others interweave other checks and/or alternative actions:
1401	–	*  * Plain put checks for and performs resize after insertion.
1402	–	*  * putIfAbsent prescans for mapping without lock (and fails to add
1403	–	*    if present), which also makes pre-emptive resize checks worthwhile.
1404	–	*  * computeIfAbsent extends form used in putIfAbsent with additional
1405	–	*    mechanics to deal with, calls, potential exceptions and null
1406	–	*    returns from function call.
1407	–	*  * compute uses the same function-call mechanics, but without
1408	–	*    the prescans
1409	–	*  * merge acts as putIfAbsent in the absent case, but invokes the
1410	–	*    update function if present
1411	–	*  * putAll attempts to pre-allocate enough table space
1412	–	*    and more lazily performs count updates and checks.
1413	–	*
1414	–	* Someday when details settle down a bit more, it might be worth
1415	–	* some factoring to reduce sprawl.
1416	–	*/
1417	–
1418	–	/** Implementation for put */
1419	–	private final Object internalPut(Object k, Object v) {
1420	–	int h = spread(k.hashCode());
1421	–	int count = 0;
1422	–	for (Node[] tab = table;;) {
1423	–	int i; Node f; int fh; Object fk;
1424	–	if (tab == null)
1425	–	tab = initTable();
1426	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1427	–	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1428	–	break;                   // no lock when adding to empty bin
1429	–	}
1430	–	else if ((fh = f.hash) == MOVED) {
1431	–	if ((fk = f.key) instanceof TreeBin) {
1432	–	TreeBin t = (TreeBin)fk;
1433	–	Object oldVal = null;
1434	–	t.acquire(0);
1435	–	try {
1436	–	if (tabAt(tab, i) == f) {
1437	–	count = 2;
1438	–	TreeNode p = t.putTreeNode(h, k, v);
1439	–	if (p != null) {
1440	–	oldVal = p.val;
1441	–	p.val = v;
1442	–	}
1443	–	}
1444	–	} finally {
1445	–	t.release(0);
1446	–	}
1447	–	if (count != 0) {
1448	–	if (oldVal != null)
1449	–	return oldVal;
1450	–	break;
1451	–	}
1452	–	}
1453	–	else
1454	–	tab = (Node[])fk;
1455	–	}
1456	–	else if ((fh & LOCKED) != 0) {
1457	–	checkForResize();
1458	–	f.tryAwaitLock(tab, i);
1459	–	}
1460	–	else if (f.casHash(fh, fh | LOCKED)) {
1461	–	Object oldVal = null;
1462	–	try {                        // needed in case equals() throws
1463	–	if (tabAt(tab, i) == f) {
1464	–	count = 1;
1465	–	for (Node e = f;; ++count) {
1466	–	Object ek, ev;
1467	–	if ((e.hash & HASH_BITS) == h &&
1468	–	(ev = e.val) != null &&
1469	–	((ek = e.key) == k || k.equals(ek))) {
1470	–	oldVal = ev;
1471	–	e.val = v;
1472	–	break;
1473	–	}
1474	–	Node last = e;
1475	–	if ((e = e.next) == null) {
1476	–	last.next = new Node(h, k, v, null);
1477	–	if (count >= TREE_THRESHOLD)
1478	–	replaceWithTreeBin(tab, i, k);
1479	–	break;
1480	–	}
1481	–	}
1482	–	}
1483	–	} finally {                  // unlock and signal if needed
1484	–	if (!f.casHash(fh | LOCKED, fh)) {
1485	–	f.hash = fh;
1486	–	synchronized (f) { f.notifyAll(); };
1487	–	}
1488	–	}
1489	–	if (count != 0) {
1490	–	if (oldVal != null)
1491	–	return oldVal;
1492	–	if (tab.length <= 64)
1493	–	count = 2;
1494	–	break;
1495	–	}
1496	–	}
1497	–	}
1498	–	counter.add(1L);
1499	–	if (count > 1)
1500	–	checkForResize();
1501	–	return null;
1502	–	}
1503	–
1504	–	/** Implementation for putIfAbsent */
1505	–	private final Object internalPutIfAbsent(Object k, Object v) {
1506	–	int h = spread(k.hashCode());
1507	–	int count = 0;
1508	–	for (Node[] tab = table;;) {
1509	–	int i; Node f; int fh; Object fk, fv;
1510	–	if (tab == null)
1511	–	tab = initTable();
1512	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1513	–	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1514	–	break;
1515	–	}
1516	–	else if ((fh = f.hash) == MOVED) {
1517	–	if ((fk = f.key) instanceof TreeBin) {
1518	–	TreeBin t = (TreeBin)fk;
1519	–	Object oldVal = null;
1520	–	t.acquire(0);
1521	–	try {
1522	–	if (tabAt(tab, i) == f) {
1523	–	count = 2;
1524	–	TreeNode p = t.putTreeNode(h, k, v);
1525	–	if (p != null)
1526	–	oldVal = p.val;
1527	–	}
1528	–	} finally {
1529	–	t.release(0);
1530	–	}
1531	–	if (count != 0) {
1532	–	if (oldVal != null)
1533	–	return oldVal;
1534	–	break;
1535	–	}
1536	–	}
1537	–	else
1538	–	tab = (Node[])fk;
1539	–	}
1540	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1541	–	((fk = f.key) == k || k.equals(fk)))
1542	–	return fv;
1543	–	else {
1544	–	Node g = f.next;
1545	–	if (g != null) { // at least 2 nodes -- search and maybe resize
1546	–	for (Node e = g;;) {
1547	–	Object ek, ev;
1548	–	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1549	–	((ek = e.key) == k || k.equals(ek)))
1550	–	return ev;
1551	–	if ((e = e.next) == null) {
1552	–	checkForResize();
1553	–	break;
1554	–	}
1555	–	}
1556	–	}
1557	–	if (((fh = f.hash) & LOCKED) != 0) {
1558	–	checkForResize();
1559	–	f.tryAwaitLock(tab, i);
1560	–	}
1561	–	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1562	–	Object oldVal = null;
1563	–	try {
1564	–	if (tabAt(tab, i) == f) {
1565	–	count = 1;
1566	–	for (Node e = f;; ++count) {
1567	–	Object ek, ev;
1568	–	if ((e.hash & HASH_BITS) == h &&
1569	–	(ev = e.val) != null &&
1570	–	((ek = e.key) == k || k.equals(ek))) {
1571	–	oldVal = ev;
1572	–	break;
1573	–	}
1574	–	Node last = e;
1575	–	if ((e = e.next) == null) {
1576	–	last.next = new Node(h, k, v, null);
1577	–	if (count >= TREE_THRESHOLD)
1578	–	replaceWithTreeBin(tab, i, k);
1579	–	break;
1580	–	}
1581	–	}
1582	–	}
1583	–	} finally {
1584	–	if (!f.casHash(fh | LOCKED, fh)) {
1585	–	f.hash = fh;
1586	–	synchronized (f) { f.notifyAll(); };
1587	–	}
1588	–	}
1589	–	if (count != 0) {
1590	–	if (oldVal != null)
1591	–	return oldVal;
1592	–	if (tab.length <= 64)
1593	–	count = 2;
1594	–	break;
1595	–	}
1596	–	}
1597	–	}
1598	–	}
1599	–	counter.add(1L);
1600	–	if (count > 1)
1601	–	checkForResize();
1602	–	return null;
1603	–	}
1604	–
1605	–	/** Implementation for computeIfAbsent */
1606	–	private final Object internalComputeIfAbsent(K k,
1607	–	Fun<? super K, ?> mf) {
1608	–	int h = spread(k.hashCode());
1609	–	Object val = null;
1610	–	int count = 0;
1611	–	for (Node[] tab = table;;) {
1612	–	Node f; int i, fh; Object fk, fv;
1613	–	if (tab == null)
1614	–	tab = initTable();
1615	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1616	–	Node node = new Node(fh = h | LOCKED, k, null, null);
1617	–	if (casTabAt(tab, i, null, node)) {
1618	–	count = 1;
1619	–	try {
1620	–	if ((val = mf.apply(k)) != null)
1621	–	node.val = val;
1622	–	} finally {
1623	–	if (val == null)
1624	–	setTabAt(tab, i, null);
1625	–	if (!node.casHash(fh, h)) {
1626	–	node.hash = h;
1627	–	synchronized (node) { node.notifyAll(); };
1628	–	}
1629	–	}
1630	–	}
1631	–	if (count != 0)
1632	–	break;
1633	–	}
1634	–	else if ((fh = f.hash) == MOVED) {
1635	–	if ((fk = f.key) instanceof TreeBin) {
1636	–	TreeBin t = (TreeBin)fk;
1637	–	boolean added = false;
1638	–	t.acquire(0);
1639	–	try {
1640	–	if (tabAt(tab, i) == f) {
1641	–	count = 1;
1642	–	TreeNode p = t.getTreeNode(h, k, t.root);
1643	–	if (p != null)
1644	–	val = p.val;
1645	–	else if ((val = mf.apply(k)) != null) {
1646	–	added = true;
1647	–	count = 2;
1648	–	t.putTreeNode(h, k, val);
1649	–	}
1650	–	}
1651	–	} finally {
1652	–	t.release(0);
1653	–	}
1654	–	if (count != 0) {
1655	–	if (!added)
1656	–	return val;
1657	–	break;
1658	–	}
1659	–	}
1660	–	else
1661	–	tab = (Node[])fk;
1662	–	}
1663	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1664	–	((fk = f.key) == k || k.equals(fk)))
1665	–	return fv;
1666	–	else {
1667	–	Node g = f.next;
1668	–	if (g != null) {
1669	–	for (Node e = g;;) {
1670	–	Object ek, ev;
1671	–	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1672	–	((ek = e.key) == k || k.equals(ek)))
1673	–	return ev;
1674	–	if ((e = e.next) == null) {
1675	–	checkForResize();
1676	–	break;
1677	–	}
1678	–	}
1679	–	}
1680	–	if (((fh = f.hash) & LOCKED) != 0) {
1681	–	checkForResize();
1682	–	f.tryAwaitLock(tab, i);
1683	–	}
1684	–	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1685	–	boolean added = false;
1686	–	try {
1687	–	if (tabAt(tab, i) == f) {
1688	–	count = 1;
1689	–	for (Node e = f;; ++count) {
1690	–	Object ek, ev;
1691	–	if ((e.hash & HASH_BITS) == h &&
1692	–	(ev = e.val) != null &&
1693	–	((ek = e.key) == k || k.equals(ek))) {
1694	–	val = ev;
1695	–	break;
1696	–	}
1697	–	Node last = e;
1698	–	if ((e = e.next) == null) {
1699	–	if ((val = mf.apply(k)) != null) {
1700	–	added = true;
1701	–	last.next = new Node(h, k, val, null);
1702	–	if (count >= TREE_THRESHOLD)
1703	–	replaceWithTreeBin(tab, i, k);
1704	–	}
1705	–	break;
1706	–	}
1707	–	}
1708	–	}
1709	–	} finally {
1710	–	if (!f.casHash(fh | LOCKED, fh)) {
1711	–	f.hash = fh;
1712	–	synchronized (f) { f.notifyAll(); };
1713	–	}
1714	–	}
1715	–	if (count != 0) {
1716	–	if (!added)
1717	–	return val;
1718	–	if (tab.length <= 64)
1719	–	count = 2;
1720	–	break;
1721	–	}
1722	–	}
1723	–	}
1724	–	}
1725	–	if (val != null) {
1726	–	counter.add(1L);
1727	–	if (count > 1)
1728	–	checkForResize();
1729	–	}
1730	–	return val;
1731	–	}
1732	–
1733	–	/** Implementation for compute */
1734	–	@SuppressWarnings("unchecked") private final Object internalCompute
1735	–	(K k, boolean onlyIfPresent, BiFun<? super K, ? super V, ? extends V> mf) {
1736	–	int h = spread(k.hashCode());
1737	–	Object val = null;
1738	–	int delta = 0;
1739	–	int count = 0;
1740	–	for (Node[] tab = table;;) {
1741	–	Node f; int i, fh; Object fk;
1742	–	if (tab == null)
1743	–	tab = initTable();
1744	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1745	–	if (onlyIfPresent)
1746	–	break;
1747	–	Node node = new Node(fh = h | LOCKED, k, null, null);
1748	–	if (casTabAt(tab, i, null, node)) {
1749	–	try {
1750	–	count = 1;
1751	–	if ((val = mf.apply(k, null)) != null) {
1752	–	node.val = val;
1753	–	delta = 1;
1754	–	}
1755	–	} finally {
1756	–	if (delta == 0)
1757	–	setTabAt(tab, i, null);
1758	–	if (!node.casHash(fh, h)) {
1759	–	node.hash = h;
1760	–	synchronized (node) { node.notifyAll(); };
1761	–	}
1762	–	}
1763	–	}
1764	–	if (count != 0)
1765	–	break;
1766	–	}
1767	–	else if ((fh = f.hash) == MOVED) {
1768	–	if ((fk = f.key) instanceof TreeBin) {
1769	–	TreeBin t = (TreeBin)fk;
1770	–	t.acquire(0);
1771	–	try {
1772	–	if (tabAt(tab, i) == f) {
1773	–	count = 1;
1774	–	TreeNode p = t.getTreeNode(h, k, t.root);
1775	–	Object pv = (p == null) ? null : p.val;
1776	–	if ((val = mf.apply(k, (V)pv)) != null) {
1777	–	if (p != null)
1778	–	p.val = val;
1779	–	else {
1780	–	count = 2;
1781	–	delta = 1;
1782	–	t.putTreeNode(h, k, val);
1783	–	}
1784	–	}
1785	–	else if (p != null) {
1786	–	delta = -1;
1787	–	t.deleteTreeNode(p);
1788	–	}
1789	–	}
1790	–	} finally {
1791	–	t.release(0);
1792	–	}
1793	–	if (count != 0)
1794	–	break;
1795	–	}
1796	–	else
1797	–	tab = (Node[])fk;
1798	–	}
1799	–	else if ((fh & LOCKED) != 0) {
1800	–	checkForResize();
1801	–	f.tryAwaitLock(tab, i);
1802	–	}
1803	–	else if (f.casHash(fh, fh | LOCKED)) {
1804	–	try {
1805	–	if (tabAt(tab, i) == f) {
1806	–	count = 1;
1807	–	for (Node e = f, pred = null;; ++count) {
1808	–	Object ek, ev;
1809	–	if ((e.hash & HASH_BITS) == h &&
1810	–	(ev = e.val) != null &&
1811	–	((ek = e.key) == k || k.equals(ek))) {
1812	–	val = mf.apply(k, (V)ev);
1813	–	if (val != null)
1814	–	e.val = val;
1815	–	else {
1816	–	delta = -1;
1817	–	Node en = e.next;
1818	–	if (pred != null)
1819	–	pred.next = en;
1820	–	else
1821	–	setTabAt(tab, i, en);
1822	–	}
1823	–	break;
1824	–	}
1825	–	pred = e;
1826	–	if ((e = e.next) == null) {
1827	–	if (!onlyIfPresent && (val = mf.apply(k, null)) != null) {
1828	–	pred.next = new Node(h, k, val, null);
1829	–	delta = 1;
1830	–	if (count >= TREE_THRESHOLD)
1831	–	replaceWithTreeBin(tab, i, k);
1832	–	}
1833	–	break;
1834	–	}
1835	–	}
1836	–	}
1837	–	} finally {
1838	–	if (!f.casHash(fh | LOCKED, fh)) {
1839	–	f.hash = fh;
1840	–	synchronized (f) { f.notifyAll(); };
1841	–	}
1842	–	}
1843	–	if (count != 0) {
1844	–	if (tab.length <= 64)
1845	–	count = 2;
1846	–	break;
1847	–	}
1848	–	}
1849	–	}
1850	–	if (delta != 0) {
1851	–	counter.add((long)delta);
1852	–	if (count > 1)
1853	–	checkForResize();
1854	–	}
1855	–	return val;
1856	–	}
1857	–
1858	–	/** Implementation for merge */
1859	–	@SuppressWarnings("unchecked") private final Object internalMerge
1860	–	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
1861	–	int h = spread(k.hashCode());
1862	–	Object val = null;
1863	–	int delta = 0;
1864	–	int count = 0;
1865	–	for (Node[] tab = table;;) {
1866	–	int i; Node f; int fh; Object fk, fv;
1867	–	if (tab == null)
1868	–	tab = initTable();
1869	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1870	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1871	–	delta = 1;
1872	–	val = v;
1873	–	break;
1874	–	}
1875	–	}
1876	–	else if ((fh = f.hash) == MOVED) {
1877	–	if ((fk = f.key) instanceof TreeBin) {
1878	–	TreeBin t = (TreeBin)fk;
1879	–	t.acquire(0);
1880	–	try {
1881	–	if (tabAt(tab, i) == f) {
1882	–	count = 1;
1883	–	TreeNode p = t.getTreeNode(h, k, t.root);
1884	–	val = (p == null) ? v : mf.apply((V)p.val, v);
1885	–	if (val != null) {
1886	–	if (p != null)
1887	–	p.val = val;
1888	–	else {
1889	–	count = 2;
1890	–	delta = 1;
1891	–	t.putTreeNode(h, k, val);
1892	–	}
1893	–	}
1894	–	else if (p != null) {
1895	–	delta = -1;
1896	–	t.deleteTreeNode(p);
1897	–	}
1898	–	}
1899	–	} finally {
1900	–	t.release(0);
1901	–	}
1902	–	if (count != 0)
1903	–	break;
1904	–	}
1905	–	else
1906	–	tab = (Node[])fk;
1907	–	}
1908	–	else if ((fh & LOCKED) != 0) {
1909	–	checkForResize();
1910	–	f.tryAwaitLock(tab, i);
1911	–	}
1912	–	else if (f.casHash(fh, fh | LOCKED)) {
1913	–	try {
1914	–	if (tabAt(tab, i) == f) {
1915	–	count = 1;
1916	–	for (Node e = f, pred = null;; ++count) {
1917	–	Object ek, ev;
1918	–	if ((e.hash & HASH_BITS) == h &&
1919	–	(ev = e.val) != null &&
1920	–	((ek = e.key) == k || k.equals(ek))) {
1921	–	val = mf.apply(v, (V)ev);
1922	–	if (val != null)
1923	–	e.val = val;
1924	–	else {
1925	–	delta = -1;
1926	–	Node en = e.next;
1927	–	if (pred != null)
1928	–	pred.next = en;
1929	–	else
1930	–	setTabAt(tab, i, en);
1931	–	}
1932	–	break;
1933	–	}
1934	–	pred = e;
1935	–	if ((e = e.next) == null) {
1936	–	val = v;
1937	–	pred.next = new Node(h, k, val, null);
1938	–	delta = 1;
1939	–	if (count >= TREE_THRESHOLD)
1940	–	replaceWithTreeBin(tab, i, k);
1941	–	break;
1942	–	}
1943	–	}
1944	–	}
1945	–	} finally {
1946	–	if (!f.casHash(fh | LOCKED, fh)) {
1947	–	f.hash = fh;
1948	–	synchronized (f) { f.notifyAll(); };
1949	–	}
1950	–	}
1951	–	if (count != 0) {
1952	–	if (tab.length <= 64)
1953	–	count = 2;
1954	–	break;
1955	–	}
1956	–	}
1957	–	}
1958	–	if (delta != 0) {
1959	–	counter.add((long)delta);
1960	–	if (count > 1)
1961	–	checkForResize();
1962	–	}
1963	–	return val;
1964	–	}
1965	–
1966	–	/** Implementation for putAll */
1967	–	private final void internalPutAll(Map<?, ?> m) {
1968	–	tryPresize(m.size());
1969	–	long delta = 0L;     // number of uncommitted additions
1970	–	boolean npe = false; // to throw exception on exit for nulls
1971	–	try {                // to clean up counts on other exceptions
1972	–	for (Map.Entry<?, ?> entry : m.entrySet()) {
1973	–	Object k, v;
1974	–	if (entry == null || (k = entry.getKey()) == null ||
1975	–	(v = entry.getValue()) == null) {
1976	–	npe = true;
1977	–	break;
1978	–	}
1979	–	int h = spread(k.hashCode());
1980	–	for (Node[] tab = table;;) {
1981	–	int i; Node f; int fh; Object fk;
1982	–	if (tab == null)
1983	–	tab = initTable();
1984	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
1985	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1986	–	++delta;
1987	–	break;
1988	–	}
1989	–	}
1990	–	else if ((fh = f.hash) == MOVED) {
1991	–	if ((fk = f.key) instanceof TreeBin) {
1992	–	TreeBin t = (TreeBin)fk;
1993	–	boolean validated = false;
1994	–	t.acquire(0);
1995	–	try {
1996	–	if (tabAt(tab, i) == f) {
1997	–	validated = true;
1998	–	TreeNode p = t.getTreeNode(h, k, t.root);
1999	–	if (p != null)
2000	–	p.val = v;
2001	–	else {
2002	–	t.putTreeNode(h, k, v);
2003	–	++delta;
2004	–	}
2005	–	}
2006	–	} finally {
2007	–	t.release(0);
2008	–	}
2009	–	if (validated)
2010	–	break;
2011	–	}
2012	–	else
2013	–	tab = (Node[])fk;
2014	–	}
2015	–	else if ((fh & LOCKED) != 0) {
2016	–	counter.add(delta);
2017	–	delta = 0L;
2018	–	checkForResize();
2019	–	f.tryAwaitLock(tab, i);
2020	–	}
2021	–	else if (f.casHash(fh, fh | LOCKED)) {
2022	–	int count = 0;
2023	–	try {
2024	–	if (tabAt(tab, i) == f) {
2025	–	count = 1;
2026	–	for (Node e = f;; ++count) {
2027	–	Object ek, ev;
2028	–	if ((e.hash & HASH_BITS) == h &&
2029	–	(ev = e.val) != null &&
2030	–	((ek = e.key) == k || k.equals(ek))) {
2031	–	e.val = v;
2032	–	break;
2033	–	}
2034	–	Node last = e;
2035	–	if ((e = e.next) == null) {
2036	–	++delta;
2037	–	last.next = new Node(h, k, v, null);
2038	–	if (count >= TREE_THRESHOLD)
2039	–	replaceWithTreeBin(tab, i, k);
2040	–	break;
2041	–	}
2042	–	}
2043	–	}
2044	–	} finally {
2045	–	if (!f.casHash(fh | LOCKED, fh)) {
2046	–	f.hash = fh;
2047	–	synchronized (f) { f.notifyAll(); };
2048	–	}
2049	–	}
2050	–	if (count != 0) {
2051	–	if (count > 1) {
2052	–	counter.add(delta);
2053	–	delta = 0L;
2054	–	checkForResize();
2055	–	}
2056	–	break;
2057	–	}
2058	–	}
2059	–	}
2060	–	}
2061	–	} finally {
2062	–	if (delta != 0)
2063	–	counter.add(delta);
2064	–	}
2065	–	if (npe)
2066	–	throw new NullPointerException();
2067	–	}
2068	–
2069	–	/* ---------------- Table Initialization and Resizing -------------- */
2070	–
2071	–	/**
697		* Returns a power of two table size for the given desired capacity.
698		* See Hackers Delight, sec 3.2
699		*/
#	Line 2083 | Line 708 | public class ConcurrentHashMapV8<K, V>
708		}
709
710		/**
711	<	* Initializes table, using the size recorded in sizeCtl.
711	>	* Returns x's Class if it is of the form "class C implements
712	>	* Comparable<C>", else null.
713		*/
714	<	private final Node[] initTable() {
715	<	Node[] tab; int sc;
716	<	while ((tab = table) == null) {
717	<	if ((sc = sizeCtl) < 0)
718	<	Thread.yield(); // lost initialization race; just spin
719	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
720	<	try {
721	<	if ((tab = table) == null) {
722	<	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
723	<	tab = table = new Node[n];
724	<	sc = n - (n >>> 2);
725	<	}
726	<	} finally {
2101	<	sizeCtl = sc;
2102	<	}
2103	<	break;
2104	<	}
2105	<	}
2106	<	return tab;
2107	<	}
2108	<
2109	<	/**
2110	<	* If table is too small and not already resizing, creates next
2111	<	* table and transfers bins.  Rechecks occupancy after a transfer
2112	<	* to see if another resize is already needed because resizings
2113	<	* are lagging additions.
2114	<	*/
2115	<	private final void checkForResize() {
2116	<	Node[] tab; int n, sc;
2117	<	while ((tab = table) != null &&
2118	<	(n = tab.length) < MAXIMUM_CAPACITY &&
2119	<	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
2120	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2121	<	try {
2122	<	if (tab == table) {
2123	<	table = rebuild(tab);
2124	<	sc = (n << 1) - (n >>> 1);
714	>	static Class<?> comparableClassFor(Object x) {
715	>	if (x instanceof Comparable) {
716	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
717	>	if ((c = x.getClass()) == String.class) // bypass checks
718	>	return c;
719	>	if ((ts = c.getGenericInterfaces()) != null) {
720	>	for (int i = 0; i < ts.length; ++i) {
721	>	if (((t = ts[i]) instanceof ParameterizedType) &&
722	>	((p = (ParameterizedType)t).getRawType() ==
723	>	Comparable.class) &&
724	>	(as = p.getActualTypeArguments()) != null &&
725	>	as.length == 1 && as[0] == c) // type arg is c
726	>	return c;
727		}
2126	–	} finally {
2127	–	sizeCtl = sc;
728		}
729		}
730	+	return null;
731		}
732
733		/**
734	<	* Tries to presize table to accommodate the given number of elements.
735	<	*
2135	<	* @param size number of elements (doesn't need to be perfectly accurate)
734	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
735	>	* class), else 0.
736		*/
737	<	private final void tryPresize(int size) {
738	<	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
739	<	tableSizeFor(size + (size >>> 1) + 1);
740	<	int sc;
2141	<	while ((sc = sizeCtl) >= 0) {
2142	<	Node[] tab = table; int n;
2143	<	if (tab == null || (n = tab.length) == 0) {
2144	<	n = (sc > c) ? sc : c;
2145	<	if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2146	<	try {
2147	<	if (table == tab) {
2148	<	table = new Node[n];
2149	<	sc = n - (n >>> 2);
2150	<	}
2151	<	} finally {
2152	<	sizeCtl = sc;
2153	<	}
2154	<	}
2155	<	}
2156	<	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2157	<	break;
2158	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2159	<	try {
2160	<	if (table == tab) {
2161	<	table = rebuild(tab);
2162	<	sc = (n << 1) - (n >>> 1);
2163	<	}
2164	<	} finally {
2165	<	sizeCtl = sc;
2166	<	}
2167	<	}
2168	<	}
737	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
738	>	static int compareComparables(Class<?> kc, Object k, Object x) {
739	>	return (x == null || x.getClass() != kc ? 0 :
740	>	((Comparable)k).compareTo(x));
741		}
742
743	+	/* ---------------- Table element access -------------- */
744	+
745		/*
746	<	* Moves and/or copies the nodes in each bin to new table. See
747	<	* above for explanation.
748	<	*
749	<	* @return the new table
750	<	*/
751	<	private static final Node[] rebuild(Node[] tab) {
752	<	int n = tab.length;
753	<	Node[] nextTab = new Node[n << 1];
754	<	Node fwd = new Node(MOVED, nextTab, null, null);
755	<	int[] buffer = null;       // holds bins to revisit; null until needed
756	<	Node rev = null;           // reverse forwarder; null until needed
757	<	int nbuffered = 0;         // the number of bins in buffer list
758	<	int bufferIndex = 0;       // buffer index of current buffered bin
759	<	int bin = n - 1;           // current non-buffered bin or -1 if none
760	<
761	<	for (int i = bin;;) {      // start upwards sweep
762	<	int fh; Node f;
763	<	if ((f = tabAt(tab, i)) == null) {
764	<	if (bin >= 0) {    // Unbuffered; no lock needed (or available)
765	<	if (!casTabAt(tab, i, f, fwd))
766	<	continue;
767	<	}
768	<	else {             // transiently use a locked forwarding node
2195	<	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
2196	<	if (!casTabAt(tab, i, f, g))
2197	<	continue;
2198	<	setTabAt(nextTab, i, null);
2199	<	setTabAt(nextTab, i + n, null);
2200	<	setTabAt(tab, i, fwd);
2201	<	if (!g.casHash(MOVED|LOCKED, MOVED)) {
2202	<	g.hash = MOVED;
2203	<	synchronized (g) { g.notifyAll(); }
2204	<	}
2205	<	}
2206	<	}
2207	<	else if ((fh = f.hash) == MOVED) {
2208	<	Object fk = f.key;
2209	<	if (fk instanceof TreeBin) {
2210	<	TreeBin t = (TreeBin)fk;
2211	<	boolean validated = false;
2212	<	t.acquire(0);
2213	<	try {
2214	<	if (tabAt(tab, i) == f) {
2215	<	validated = true;
2216	<	splitTreeBin(nextTab, i, t);
2217	<	setTabAt(tab, i, fwd);
2218	<	}
2219	<	} finally {
2220	<	t.release(0);
2221	<	}
2222	<	if (!validated)
2223	<	continue;
2224	<	}
2225	<	}
2226	<	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
2227	<	boolean validated = false;
2228	<	try {              // split to lo and hi lists; copying as needed
2229	<	if (tabAt(tab, i) == f) {
2230	<	validated = true;
2231	<	splitBin(nextTab, i, f);
2232	<	setTabAt(tab, i, fwd);
2233	<	}
2234	<	} finally {
2235	<	if (!f.casHash(fh | LOCKED, fh)) {
2236	<	f.hash = fh;
2237	<	synchronized (f) { f.notifyAll(); };
2238	<	}
2239	<	}
2240	<	if (!validated)
2241	<	continue;
2242	<	}
2243	<	else {
2244	<	if (buffer == null) // initialize buffer for revisits
2245	<	buffer = new int[TRANSFER_BUFFER_SIZE];
2246	<	if (bin < 0 && bufferIndex > 0) {
2247	<	int j = buffer[--bufferIndex];
2248	<	buffer[bufferIndex] = i;
2249	<	i = j;         // swap with another bin
2250	<	continue;
2251	<	}
2252	<	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
2253	<	f.tryAwaitLock(tab, i);
2254	<	continue;      // no other options -- block
2255	<	}
2256	<	if (rev == null)   // initialize reverse-forwarder
2257	<	rev = new Node(MOVED, tab, null, null);
2258	<	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
2259	<	continue;      // recheck before adding to list
2260	<	buffer[nbuffered++] = i;
2261	<	setTabAt(nextTab, i, rev);     // install place-holders
2262	<	setTabAt(nextTab, i + n, rev);
2263	<	}
2264	<
2265	<	if (bin > 0)
2266	<	i = --bin;
2267	<	else if (buffer != null && nbuffered > 0) {
2268	<	bin = -1;
2269	<	i = buffer[bufferIndex = --nbuffered];
2270	<	}
2271	<	else
2272	<	return nextTab;
2273	<	}
746	>	* Volatile access methods are used for table elements as well as
747	>	* elements of in-progress next table while resizing.  All uses of
748	>	* the tab arguments must be null checked by callers.  All callers
749	>	* also paranoically precheck that tab's length is not zero (or an
750	>	* equivalent check), thus ensuring that any index argument taking
751	>	* the form of a hash value anded with (length - 1) is a valid
752	>	* index.  Note that, to be correct wrt arbitrary concurrency
753	>	* errors by users, these checks must operate on local variables,
754	>	* which accounts for some odd-looking inline assignments below.
755	>	* Note that calls to setTabAt always occur within locked regions,
756	>	* and so in principle require only release ordering, not
757	>	* full volatile semantics, but are currently coded as volatile
758	>	* writes to be conservative.
759	>	*/
760	>
761	>	@SuppressWarnings("unchecked")
762	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
763	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
764	>	}
765	>
766	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
767	>	Node<K,V> c, Node<K,V> v) {
768	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
769		}
770
771	<	/**
772	<	* Splits a normal bin with list headed by e into lo and hi parts;
2278	<	* installs in given table.
2279	<	*/
2280	<	private static void splitBin(Node[] nextTab, int i, Node e) {
2281	<	int bit = nextTab.length >>> 1; // bit to split on
2282	<	int runBit = e.hash & bit;
2283	<	Node lastRun = e, lo = null, hi = null;
2284	<	for (Node p = e.next; p != null; p = p.next) {
2285	<	int b = p.hash & bit;
2286	<	if (b != runBit) {
2287	<	runBit = b;
2288	<	lastRun = p;
2289	<	}
2290	<	}
2291	<	if (runBit == 0)
2292	<	lo = lastRun;
2293	<	else
2294	<	hi = lastRun;
2295	<	for (Node p = e; p != lastRun; p = p.next) {
2296	<	int ph = p.hash & HASH_BITS;
2297	<	Object pk = p.key, pv = p.val;
2298	<	if ((ph & bit) == 0)
2299	<	lo = new Node(ph, pk, pv, lo);
2300	<	else
2301	<	hi = new Node(ph, pk, pv, hi);
2302	<	}
2303	<	setTabAt(nextTab, i, lo);
2304	<	setTabAt(nextTab, i + bit, hi);
771	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
772	>	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
773		}
774
775	+	/* ---------------- Fields -------------- */
776	+
777		/**
778	<	* Splits a tree bin into lo and hi parts; installs in given table.
778	>	* The array of bins. Lazily initialized upon first insertion.
779	>	* Size is always a power of two. Accessed directly by iterators.
780		*/
781	<	private static void splitTreeBin(Node[] nextTab, int i, TreeBin t) {
2311	<	int bit = nextTab.length >>> 1;
2312	<	TreeBin lt = new TreeBin();
2313	<	TreeBin ht = new TreeBin();
2314	<	int lc = 0, hc = 0;
2315	<	for (Node e = t.first; e != null; e = e.next) {
2316	<	int h = e.hash & HASH_BITS;
2317	<	Object k = e.key, v = e.val;
2318	<	if ((h & bit) == 0) {
2319	<	++lc;
2320	<	lt.putTreeNode(h, k, v);
2321	<	}
2322	<	else {
2323	<	++hc;
2324	<	ht.putTreeNode(h, k, v);
2325	<	}
2326	<	}
2327	<	Node ln, hn; // throw away trees if too small
2328	<	if (lc <= (TREE_THRESHOLD >>> 1)) {
2329	<	ln = null;
2330	<	for (Node p = lt.first; p != null; p = p.next)
2331	<	ln = new Node(p.hash, p.key, p.val, ln);
2332	<	}
2333	<	else
2334	<	ln = new Node(MOVED, lt, null, null);
2335	<	setTabAt(nextTab, i, ln);
2336	<	if (hc <= (TREE_THRESHOLD >>> 1)) {
2337	<	hn = null;
2338	<	for (Node p = ht.first; p != null; p = p.next)
2339	<	hn = new Node(p.hash, p.key, p.val, hn);
2340	<	}
2341	<	else
2342	<	hn = new Node(MOVED, ht, null, null);
2343	<	setTabAt(nextTab, i + bit, hn);
2344	<	}
781	>	transient volatile Node<K,V>[] table;
782
783		/**
784	<	* Implementation for clear. Steps through each bin, removing all
2348	<	* nodes.
784	>	* The next table to use; non-null only while resizing.
785		*/
786	<	private final void internalClear() {
2351	<	long delta = 0L; // negative number of deletions
2352	<	int i = 0;
2353	<	Node[] tab = table;
2354	<	while (tab != null && i < tab.length) {
2355	<	int fh; Object fk;
2356	<	Node f = tabAt(tab, i);
2357	<	if (f == null)
2358	<	++i;
2359	<	else if ((fh = f.hash) == MOVED) {
2360	<	if ((fk = f.key) instanceof TreeBin) {
2361	<	TreeBin t = (TreeBin)fk;
2362	<	t.acquire(0);
2363	<	try {
2364	<	if (tabAt(tab, i) == f) {
2365	<	for (Node p = t.first; p != null; p = p.next) {
2366	<	if (p.val != null) { // (currently always true)
2367	<	p.val = null;
2368	<	--delta;
2369	<	}
2370	<	}
2371	<	t.first = null;
2372	<	t.root = null;
2373	<	++i;
2374	<	}
2375	<	} finally {
2376	<	t.release(0);
2377	<	}
2378	<	}
2379	<	else
2380	<	tab = (Node[])fk;
2381	<	}
2382	<	else if ((fh & LOCKED) != 0) {
2383	<	counter.add(delta); // opportunistically update count
2384	<	delta = 0L;
2385	<	f.tryAwaitLock(tab, i);
2386	<	}
2387	<	else if (f.casHash(fh, fh | LOCKED)) {
2388	<	try {
2389	<	if (tabAt(tab, i) == f) {
2390	<	for (Node e = f; e != null; e = e.next) {
2391	<	if (e.val != null) {  // (currently always true)
2392	<	e.val = null;
2393	<	--delta;
2394	<	}
2395	<	}
2396	<	setTabAt(tab, i, null);
2397	<	++i;
2398	<	}
2399	<	} finally {
2400	<	if (!f.casHash(fh | LOCKED, fh)) {
2401	<	f.hash = fh;
2402	<	synchronized (f) { f.notifyAll(); };
2403	<	}
2404	<	}
2405	<	}
2406	<	}
2407	<	if (delta != 0)
2408	<	counter.add(delta);
2409	<	}
2410	<
2411	<	/* ----------------Table Traversal -------------- */
786	>	private transient volatile Node<K,V>[] nextTable;
787
788		/**
789	<	* Encapsulates traversal for methods such as containsValue; also
790	<	* serves as a base class for other iterators and bulk tasks.
791	<	*
792	<	* At each step, the iterator snapshots the key ("nextKey") and
793	<	* value ("nextVal") of a valid node (i.e., one that, at point of
2419	<	* snapshot, has a non-null user value). Because val fields can
2420	<	* change (including to null, indicating deletion), field nextVal
2421	<	* might not be accurate at point of use, but still maintains the
2422	<	* weak consistency property of holding a value that was once
2423	<	* valid. To support iterator.remove, the nextKey field is not
2424	<	* updated (nulled out) when the iterator cannot advance.
2425	<	*
2426	<	* Internal traversals directly access these fields, as in:
2427	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2428	<	*
2429	<	* Exported iterators must track whether the iterator has advanced
2430	<	* (in hasNext vs next) (by setting/checking/nulling field
2431	<	* nextVal), and then extract key, value, or key-value pairs as
2432	<	* return values of next().
2433	<	*
2434	<	* The iterator visits once each still-valid node that was
2435	<	* reachable upon iterator construction. It might miss some that
2436	<	* were added to a bin after the bin was visited, which is OK wrt
2437	<	* consistency guarantees. Maintaining this property in the face
2438	<	* of possible ongoing resizes requires a fair amount of
2439	<	* bookkeeping state that is difficult to optimize away amidst
2440	<	* volatile accesses.  Even so, traversal maintains reasonable
2441	<	* throughput.
2442	<	*
2443	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2444	<	* However, if the table has been resized, then all future steps
2445	<	* must traverse both the bin at the current index as well as at
2446	<	* (index + baseSize); and so on for further resizings. To
2447	<	* paranoically cope with potential sharing by users of iterators
2448	<	* across threads, iteration terminates if a bounds checks fails
2449	<	* for a table read.
2450	<	*
2451	<	* This class extends ForkJoinTask to streamline parallel
2452	<	* iteration in bulk operations (see BulkTask). This adds only an
2453	<	* int of space overhead, which is close enough to negligible in
2454	<	* cases where it is not needed to not worry about it.  Because
2455	<	* ForkJoinTask is Serializable, but iterators need not be, we
2456	<	* need to add warning suppressions.
2457	<	*/
2458	<	@SuppressWarnings("serial") static class Traverser<K,V,R> extends ForkJoinTask<R> {
2459	<	final ConcurrentHashMapV8<K, V> map;
2460	<	Node next;           // the next entry to use
2461	<	Object nextKey;      // cached key field of next
2462	<	Object nextVal;      // cached val field of next
2463	<	Node[] tab;          // current table; updated if resized
2464	<	int index;           // index of bin to use next
2465	<	int baseIndex;       // current index of initial table
2466	<	int baseLimit;       // index bound for initial table
2467	<	int baseSize;        // initial table size
789	>	* Base counter value, used mainly when there is no contention,
790	>	* but also as a fallback during table initialization
791	>	* races. Updated via CAS.
792	>	*/
793	>	private transient volatile long baseCount;
794
795	<	/** Creates iterator for all entries in the table. */
796	<	Traverser(ConcurrentHashMapV8<K, V> map) {
797	<	this.map = map;
798	<	}
795	>	/**
796	>	* Table initialization and resizing control.  When negative, the
797	>	* table is being initialized or resized: -1 for initialization,
798	>	* else -(1 + the number of active resizing threads).  Otherwise,
799	>	* when table is null, holds the initial table size to use upon
800	>	* creation, or 0 for default. After initialization, holds the
801	>	* next element count value upon which to resize the table.
802	>	*/
803	>	private transient volatile int sizeCtl;
804
805	<	/** Creates iterator for split() methods */
806	<	Traverser(Traverser<K,V,?> it) {
807	<	ConcurrentHashMapV8<K, V> m; Node[] t;
808	<	if ((m = this.map = it.map) == null)
2478	<	t = null;
2479	<	else if ((t = it.tab) == null && // force parent tab initialization
2480	<	(t = it.tab = m.table) != null)
2481	<	it.baseLimit = it.baseSize = t.length;
2482	<	this.tab = t;
2483	<	this.baseSize = it.baseSize;
2484	<	it.baseLimit = this.index = this.baseIndex =
2485	<	((this.baseLimit = it.baseLimit) + it.baseIndex + 1) >>> 1;
2486	<	}
805	>	/**
806	>	* The next table index (plus one) to split while resizing.
807	>	*/
808	>	private transient volatile int transferIndex;
809
810	<	/**
811	<	* Advances next; returns nextVal or null if terminated.
812	<	* See above for explanation.
813	<	*/
2492	<	final Object advance() {
2493	<	Node e = next;
2494	<	Object ev = null;
2495	<	outer: do {
2496	<	if (e != null)                  // advance past used/skipped node
2497	<	e = e.next;
2498	<	while (e == null) {             // get to next non-null bin
2499	<	ConcurrentHashMapV8<K, V> m;
2500	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2501	<	if ((t = tab) != null)
2502	<	n = t.length;
2503	<	else if ((m = map) != null && (t = tab = m.table) != null)
2504	<	n = baseLimit = baseSize = t.length;
2505	<	else
2506	<	break outer;
2507	<	if ((b = baseIndex) >= baseLimit ||
2508	<	(i = index) < 0 || i >= n)
2509	<	break outer;
2510	<	if ((e = tabAt(t, i)) != null && e.hash == MOVED) {
2511	<	if ((ek = e.key) instanceof TreeBin)
2512	<	e = ((TreeBin)ek).first;
2513	<	else {
2514	<	tab = (Node[])ek;
2515	<	continue;           // restarts due to null val
2516	<	}
2517	<	}                           // visit upper slots if present
2518	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2519	<	}
2520	<	nextKey = e.key;
2521	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2522	<	next = e;
2523	<	return nextVal = ev;
2524	<	}
810	>	/**
811	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
812	>	*/
813	>	private transient volatile int cellsBusy;
814
815	<	public final void remove() {
816	<	Object k = nextKey;
817	<	if (k == null && (advance() == null || (k = nextKey) == null))
818	<	throw new IllegalStateException();
2530	<	map.internalReplace(k, null, null);
2531	<	}
815	>	/**
816	>	* Table of counter cells. When non-null, size is a power of 2.
817	>	*/
818	>	private transient volatile CounterCell[] counterCells;
819
820	<	public final boolean hasNext() {
821	<	return nextVal != null || advance() != null;
822	<	}
820	>	// views
821	>	private transient KeySetView<K,V> keySet;
822	>	private transient ValuesView<K,V> values;
823	>	private transient EntrySetView<K,V> entrySet;
824
2537	–	public final boolean hasMoreElements() { return hasNext(); }
2538	–	public final void setRawResult(Object x) { }
2539	–	public R getRawResult() { return null; }
2540	–	public boolean exec() { return true; }
2541	–	}
825
826		/* ---------------- Public operations -------------- */
827
#	Line 2546 | Line 829 | public class ConcurrentHashMapV8<K, V>
829		* Creates a new, empty map with the default initial table size (16).
830		*/
831		public ConcurrentHashMapV8() {
2549	–	this.counter = new LongAdder();
832		}
833
834		/**
#	Line 2565 | Line 847 | public class ConcurrentHashMapV8<K, V>
847		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
848		MAXIMUM_CAPACITY :
849		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2568	–	this.counter = new LongAdder();
850		this.sizeCtl = cap;
851		}
852
#	Line 2575 | Line 856 | public class ConcurrentHashMapV8<K, V>
856		* @param m the map
857		*/
858		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2578	–	this.counter = new LongAdder();
859		this.sizeCtl = DEFAULT_CAPACITY;
860	<	internalPutAll(m);
860	>	putAll(m);
861		}
862
863		/**
#	Line 2618 | Line 898 | public class ConcurrentHashMapV8<K, V>
898		* nonpositive
899		*/
900		public ConcurrentHashMapV8(int initialCapacity,
901	<	float loadFactor, int concurrencyLevel) {
901	>	float loadFactor, int concurrencyLevel) {
902		if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
903		throw new IllegalArgumentException();
904		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
#	Line 2626 | Line 906 | public class ConcurrentHashMapV8<K, V>
906		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
907		int cap = (size >= (long)MAXIMUM_CAPACITY) ?
908		MAXIMUM_CAPACITY : tableSizeFor((int)size);
2629	–	this.counter = new LongAdder();
909		this.sizeCtl = cap;
910		}
911
912	<	/**
2634	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2635	<	* from the given type to {@code Boolean.TRUE}.
2636	<	*
2637	<	* @return the new set
2638	<	*/
2639	<	public static <K> KeySetView<K,Boolean> newKeySet() {
2640	<	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(),
2641	<	Boolean.TRUE);
2642	<	}
2643	<
2644	<	/**
2645	<	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2646	<	* from the given type to {@code Boolean.TRUE}.
2647	<	*
2648	<	* @param initialCapacity The implementation performs internal
2649	<	* sizing to accommodate this many elements.
2650	<	* @throws IllegalArgumentException if the initial capacity of
2651	<	* elements is negative
2652	<	* @return the new set
2653	<	*/
2654	<	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2655	<	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(initialCapacity),
2656	<	Boolean.TRUE);
2657	<	}
2658	<
2659	<	/**
2660	<	* {@inheritDoc}
2661	<	*/
2662	<	public boolean isEmpty() {
2663	<	return counter.sum() <= 0L; // ignore transient negative values
2664	<	}
912	>	// Original (since JDK1.2) Map methods
913
914		/**
915		* {@inheritDoc}
916		*/
917		public int size() {
918	<	long n = counter.sum();
918	>	long n = sumCount();
919		return ((n < 0L) ? 0 :
920		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
921		(int)n);
922		}
923
924		/**
925	<	* Returns the number of mappings. This method should be used
2678	<	* instead of {@link #size} because a ConcurrentHashMapV8 may
2679	<	* contain more mappings than can be represented as an int. The
2680	<	* value returned is a snapshot; the actual count may differ if
2681	<	* there are ongoing concurrent insertions or removals.
2682	<	*
2683	<	* @return the number of mappings
925	>	* {@inheritDoc}
926		*/
927	<	public long mappingCount() {
928	<	long n = counter.sum();
2687	<	return (n < 0L) ? 0L : n; // ignore transient negative values
927	>	public boolean isEmpty() {
928	>	return sumCount() <= 0L; // ignore transient negative values
929		}
930
931		/**
#	Line 2698 | Line 939 | public class ConcurrentHashMapV8<K, V>
939		*
940		* @throws NullPointerException if the specified key is null
941		*/
942	<	@SuppressWarnings("unchecked") public V get(Object key) {
943	<	if (key == null)
944	<	throw new NullPointerException();
945	<	return (V)internalGet(key);
946	<	}
947	<
948	<	/**
949	<	* Returns the value to which the specified key is mapped,
950	<	* or the given defaultValue if this map contains no mapping for the key.
951	<	*
952	<	* @param key the key
953	<	* @param defaultValue the value to return if this map contains
954	<	* no mapping for the given key
955	<	* @return the mapping for the key, if present; else the defaultValue
956	<	* @throws NullPointerException if the specified key is null
957	<	*/
958	<	@SuppressWarnings("unchecked") public V getValueOrDefault(Object key, V defaultValue) {
959	<	if (key == null)
2719	<	throw new NullPointerException();
2720	<	V v = (V) internalGet(key);
2721	<	return v == null ? defaultValue : v;
942	>	public V get(Object key) {
943	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
944	>	int h = spread(key.hashCode());
945	>	if ((tab = table) != null && (n = tab.length) > 0 &&
946	>	(e = tabAt(tab, (n - 1) & h)) != null) {
947	>	if ((eh = e.hash) == h) {
948	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
949	>	return e.val;
950	>	}
951	>	else if (eh < 0)
952	>	return (p = e.find(h, key)) != null ? p.val : null;
953	>	while ((e = e.next) != null) {
954	>	if (e.hash == h &&
955	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
956	>	return e.val;
957	>	}
958	>	}
959	>	return null;
960		}
961
962		/**
963		* Tests if the specified object is a key in this table.
964		*
965	<	* @param  key   possible key
965	>	* @param  key possible key
966		* @return {@code true} if and only if the specified object
967		*         is a key in this table, as determined by the
968		*         {@code equals} method; {@code false} otherwise
969		* @throws NullPointerException if the specified key is null
970		*/
971		public boolean containsKey(Object key) {
972	<	if (key == null)
2735	<	throw new NullPointerException();
2736	<	return internalGet(key) != null;
972	>	return get(key) != null;
973		}
974
975		/**
#	Line 2749 | Line 985 | public class ConcurrentHashMapV8<K, V>
985		public boolean containsValue(Object value) {
986		if (value == null)
987		throw new NullPointerException();
988	<	Object v;
989	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
990	<	while ((v = it.advance()) != null) {
991	<	if (v == value || value.equals(v))
992	<	return true;
988	>	Node<K,V>[] t;
989	>	if ((t = table) != null) {
990	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
991	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
992	>	V v;
993	>	if ((v = p.val) == value || (v != null && value.equals(v)))
994	>	return true;
995	>	}
996		}
997		return false;
998		}
999
1000		/**
2762	–	* Legacy method testing if some key maps into the specified value
2763	–	* in this table.  This method is identical in functionality to
2764	–	* {@link #containsValue}, and exists solely to ensure
2765	–	* full compatibility with class {@link java.util.Hashtable},
2766	–	* which supported this method prior to introduction of the
2767	–	* Java Collections framework.
2768	–	*
2769	–	* @param  value a value to search for
2770	–	* @return {@code true} if and only if some key maps to the
2771	–	*         {@code value} argument in this table as
2772	–	*         determined by the {@code equals} method;
2773	–	*         {@code false} otherwise
2774	–	* @throws NullPointerException if the specified value is null
2775	–	*/
2776	–	public boolean contains(Object value) {
2777	–	return containsValue(value);
2778	–	}
2779	–
2780	–	/**
1001		* Maps the specified key to the specified value in this table.
1002		* Neither the key nor the value can be null.
1003		*
1004	<	* <p> The value can be retrieved by calling the {@code get} method
1004	>	* <p>The value can be retrieved by calling the {@code get} method
1005		* with a key that is equal to the original key.
1006		*
1007		* @param key key with which the specified value is to be associated
#	Line 2790 | Line 1010 | public class ConcurrentHashMapV8<K, V>
1010		*         {@code null} if there was no mapping for {@code key}
1011		* @throws NullPointerException if the specified key or value is null
1012		*/
1013	<	@SuppressWarnings("unchecked") public V put(K key, V value) {
1014	<	if (key == null || value == null)
1013	>	public V put(K key, V value) {
1014	>	return putVal(key, value, false);
1015	>	}
1016	>
1017	>	/** Implementation for put and putIfAbsent */
1018	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
1019	>	if (key == null || value == null) throw new NullPointerException();
1020	>	int hash = spread(key.hashCode());
1021	>	int binCount = 0;
1022	>	for (Node<K,V>[] tab = table;;) {
1023	>	Node<K,V> f; int n, i, fh;
1024	>	if (tab == null || (n = tab.length) == 0)
1025	>	tab = initTable();
1026	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
1027	>	if (casTabAt(tab, i, null,
1028	>	new Node<K,V>(hash, key, value, null)))
1029	>	break;                   // no lock when adding to empty bin
1030	>	}
1031	>	else if ((fh = f.hash) == MOVED)
1032	>	tab = helpTransfer(tab, f);
1033	>	else {
1034	>	V oldVal = null;
1035	>	synchronized (f) {
1036	>	if (tabAt(tab, i) == f) {
1037	>	if (fh >= 0) {
1038	>	binCount = 1;
1039	>	for (Node<K,V> e = f;; ++binCount) {
1040	>	K ek;
1041	>	if (e.hash == hash &&
1042	>	((ek = e.key) == key ||
1043	>	(ek != null && key.equals(ek)))) {
1044	>	oldVal = e.val;
1045	>	if (!onlyIfAbsent)
1046	>	e.val = value;
1047	>	break;
1048	>	}
1049	>	Node<K,V> pred = e;
1050	>	if ((e = e.next) == null) {
1051	>	pred.next = new Node<K,V>(hash, key,
1052	>	value, null);
1053	>	break;
1054	>	}
1055	>	}
1056	>	}
1057	>	else if (f instanceof TreeBin) {
1058	>	Node<K,V> p;
1059	>	binCount = 2;
1060	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1061	>	value)) != null) {
1062	>	oldVal = p.val;
1063	>	if (!onlyIfAbsent)
1064	>	p.val = value;
1065	>	}
1066	>	}
1067	>	}
1068	>	}
1069	>	if (binCount != 0) {
1070	>	if (binCount >= TREEIFY_THRESHOLD)
1071	>	treeifyBin(tab, i);
1072	>	if (oldVal != null)
1073	>	return oldVal;
1074	>	break;
1075	>	}
1076	>	}
1077	>	}
1078	>	addCount(1L, binCount);
1079	>	return null;
1080	>	}
1081	>
1082	>	/**
1083	>	* Copies all of the mappings from the specified map to this one.
1084	>	* These mappings replace any mappings that this map had for any of the
1085	>	* keys currently in the specified map.
1086	>	*
1087	>	* @param m mappings to be stored in this map
1088	>	*/
1089	>	public void putAll(Map<? extends K, ? extends V> m) {
1090	>	tryPresize(m.size());
1091	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1092	>	putVal(e.getKey(), e.getValue(), false);
1093	>	}
1094	>
1095	>	/**
1096	>	* Removes the key (and its corresponding value) from this map.
1097	>	* This method does nothing if the key is not in the map.
1098	>	*
1099	>	* @param  key the key that needs to be removed
1100	>	* @return the previous value associated with {@code key}, or
1101	>	*         {@code null} if there was no mapping for {@code key}
1102	>	* @throws NullPointerException if the specified key is null
1103	>	*/
1104	>	public V remove(Object key) {
1105	>	return replaceNode(key, null, null);
1106	>	}
1107	>
1108	>	/**
1109	>	* Implementation for the four public remove/replace methods:
1110	>	* Replaces node value with v, conditional upon match of cv if
1111	>	* non-null.  If resulting value is null, delete.
1112	>	*/
1113	>	final V replaceNode(Object key, V value, Object cv) {
1114	>	int hash = spread(key.hashCode());
1115	>	for (Node<K,V>[] tab = table;;) {
1116	>	Node<K,V> f; int n, i, fh;
1117	>	if (tab == null || (n = tab.length) == 0 ||
1118	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1119	>	break;
1120	>	else if ((fh = f.hash) == MOVED)
1121	>	tab = helpTransfer(tab, f);
1122	>	else {
1123	>	V oldVal = null;
1124	>	boolean validated = false;
1125	>	synchronized (f) {
1126	>	if (tabAt(tab, i) == f) {
1127	>	if (fh >= 0) {
1128	>	validated = true;
1129	>	for (Node<K,V> e = f, pred = null;;) {
1130	>	K ek;
1131	>	if (e.hash == hash &&
1132	>	((ek = e.key) == key ||
1133	>	(ek != null && key.equals(ek)))) {
1134	>	V ev = e.val;
1135	>	if (cv == null || cv == ev ||
1136	>	(ev != null && cv.equals(ev))) {
1137	>	oldVal = ev;
1138	>	if (value != null)
1139	>	e.val = value;
1140	>	else if (pred != null)
1141	>	pred.next = e.next;
1142	>	else
1143	>	setTabAt(tab, i, e.next);
1144	>	}
1145	>	break;
1146	>	}
1147	>	pred = e;
1148	>	if ((e = e.next) == null)
1149	>	break;
1150	>	}
1151	>	}
1152	>	else if (f instanceof TreeBin) {
1153	>	validated = true;
1154	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1155	>	TreeNode<K,V> r, p;
1156	>	if ((r = t.root) != null &&
1157	>	(p = r.findTreeNode(hash, key, null)) != null) {
1158	>	V pv = p.val;
1159	>	if (cv == null || cv == pv ||
1160	>	(pv != null && cv.equals(pv))) {
1161	>	oldVal = pv;
1162	>	if (value != null)
1163	>	p.val = value;
1164	>	else if (t.removeTreeNode(p))
1165	>	setTabAt(tab, i, untreeify(t.first));
1166	>	}
1167	>	}
1168	>	}
1169	>	}
1170	>	}
1171	>	if (validated) {
1172	>	if (oldVal != null) {
1173	>	if (value == null)
1174	>	addCount(-1L, -1);
1175	>	return oldVal;
1176	>	}
1177	>	break;
1178	>	}
1179	>	}
1180	>	}
1181	>	return null;
1182	>	}
1183	>
1184	>	/**
1185	>	* Removes all of the mappings from this map.
1186	>	*/
1187	>	public void clear() {
1188	>	long delta = 0L; // negative number of deletions
1189	>	int i = 0;
1190	>	Node<K,V>[] tab = table;
1191	>	while (tab != null && i < tab.length) {
1192	>	int fh;
1193	>	Node<K,V> f = tabAt(tab, i);
1194	>	if (f == null)
1195	>	++i;
1196	>	else if ((fh = f.hash) == MOVED) {
1197	>	tab = helpTransfer(tab, f);
1198	>	i = 0; // restart
1199	>	}
1200	>	else {
1201	>	synchronized (f) {
1202	>	if (tabAt(tab, i) == f) {
1203	>	Node<K,V> p = (fh >= 0 ? f :
1204	>	(f instanceof TreeBin) ?
1205	>	((TreeBin<K,V>)f).first : null);
1206	>	while (p != null) {
1207	>	--delta;
1208	>	p = p.next;
1209	>	}
1210	>	setTabAt(tab, i++, null);
1211	>	}
1212	>	}
1213	>	}
1214	>	}
1215	>	if (delta != 0L)
1216	>	addCount(delta, -1);
1217	>	}
1218	>
1219	>	/**
1220	>	* Returns a {@link Set} view of the keys contained in this map.
1221	>	* The set is backed by the map, so changes to the map are
1222	>	* reflected in the set, and vice-versa. The set supports element
1223	>	* removal, which removes the corresponding mapping from this map,
1224	>	* via the {@code Iterator.remove}, {@code Set.remove},
1225	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1226	>	* operations.  It does not support the {@code add} or
1227	>	* {@code addAll} operations.
1228	>	*
1229	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1230	>	* that will never throw {@link ConcurrentModificationException},
1231	>	* and guarantees to traverse elements as they existed upon
1232	>	* construction of the iterator, and may (but is not guaranteed to)
1233	>	* reflect any modifications subsequent to construction.
1234	>	*
1235	>	* @return the set view
1236	>	*/
1237	>	public KeySetView<K,V> keySet() {
1238	>	KeySetView<K,V> ks;
1239	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1240	>	}
1241	>
1242	>	/**
1243	>	* Returns a {@link Collection} view of the values contained in this map.
1244	>	* The collection is backed by the map, so changes to the map are
1245	>	* reflected in the collection, and vice-versa.  The collection
1246	>	* supports element removal, which removes the corresponding
1247	>	* mapping from this map, via the {@code Iterator.remove},
1248	>	* {@code Collection.remove}, {@code removeAll},
1249	>	* {@code retainAll}, and {@code clear} operations.  It does not
1250	>	* support the {@code add} or {@code addAll} operations.
1251	>	*
1252	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1253	>	* that will never throw {@link ConcurrentModificationException},
1254	>	* and guarantees to traverse elements as they existed upon
1255	>	* construction of the iterator, and may (but is not guaranteed to)
1256	>	* reflect any modifications subsequent to construction.
1257	>	*
1258	>	* @return the collection view
1259	>	*/
1260	>	public Collection<V> values() {
1261	>	ValuesView<K,V> vs;
1262	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1263	>	}
1264	>
1265	>	/**
1266	>	* Returns a {@link Set} view of the mappings contained in this map.
1267	>	* The set is backed by the map, so changes to the map are
1268	>	* reflected in the set, and vice-versa.  The set supports element
1269	>	* removal, which removes the corresponding mapping from the map,
1270	>	* via the {@code Iterator.remove}, {@code Set.remove},
1271	>	* {@code removeAll}, {@code retainAll}, and {@code clear}
1272	>	* operations.
1273	>	*
1274	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1275	>	* that will never throw {@link ConcurrentModificationException},
1276	>	* and guarantees to traverse elements as they existed upon
1277	>	* construction of the iterator, and may (but is not guaranteed to)
1278	>	* reflect any modifications subsequent to construction.
1279	>	*
1280	>	* @return the set view
1281	>	*/
1282	>	public Set<Map.Entry<K,V>> entrySet() {
1283	>	EntrySetView<K,V> es;
1284	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1285	>	}
1286	>
1287	>	/**
1288	>	* Returns the hash code value for this {@link Map}, i.e.,
1289	>	* the sum of, for each key-value pair in the map,
1290	>	* {@code key.hashCode() ^ value.hashCode()}.
1291	>	*
1292	>	* @return the hash code value for this map
1293	>	*/
1294	>	public int hashCode() {
1295	>	int h = 0;
1296	>	Node<K,V>[] t;
1297	>	if ((t = table) != null) {
1298	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1299	>	for (Node<K,V> p; (p = it.advance()) != null; )
1300	>	h += p.key.hashCode() ^ p.val.hashCode();
1301	>	}
1302	>	return h;
1303	>	}
1304	>
1305	>	/**
1306	>	* Returns a string representation of this map.  The string
1307	>	* representation consists of a list of key-value mappings (in no
1308	>	* particular order) enclosed in braces ("{@code {}}").  Adjacent
1309	>	* mappings are separated by the characters {@code ", "} (comma
1310	>	* and space).  Each key-value mapping is rendered as the key
1311	>	* followed by an equals sign ("{@code =}") followed by the
1312	>	* associated value.
1313	>	*
1314	>	* @return a string representation of this map
1315	>	*/
1316	>	public String toString() {
1317	>	Node<K,V>[] t;
1318	>	int f = (t = table) == null ? 0 : t.length;
1319	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1320	>	StringBuilder sb = new StringBuilder();
1321	>	sb.append('{');
1322	>	Node<K,V> p;
1323	>	if ((p = it.advance()) != null) {
1324	>	for (;;) {
1325	>	K k = p.key;
1326	>	V v = p.val;
1327	>	sb.append(k == this ? "(this Map)" : k);
1328	>	sb.append('=');
1329	>	sb.append(v == this ? "(this Map)" : v);
1330	>	if ((p = it.advance()) == null)
1331	>	break;
1332	>	sb.append(',').append(' ');
1333	>	}
1334	>	}
1335	>	return sb.append('}').toString();
1336	>	}
1337	>
1338	>	/**
1339	>	* Compares the specified object with this map for equality.
1340	>	* Returns {@code true} if the given object is a map with the same
1341	>	* mappings as this map.  This operation may return misleading
1342	>	* results if either map is concurrently modified during execution
1343	>	* of this method.
1344	>	*
1345	>	* @param o object to be compared for equality with this map
1346	>	* @return {@code true} if the specified object is equal to this map
1347	>	*/
1348	>	public boolean equals(Object o) {
1349	>	if (o != this) {
1350	>	if (!(o instanceof Map))
1351	>	return false;
1352	>	Map<?,?> m = (Map<?,?>) o;
1353	>	Node<K,V>[] t;
1354	>	int f = (t = table) == null ? 0 : t.length;
1355	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1356	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1357	>	V val = p.val;
1358	>	Object v = m.get(p.key);
1359	>	if (v == null || (v != val && !v.equals(val)))
1360	>	return false;
1361	>	}
1362	>	for (Map.Entry<?,?> e : m.entrySet()) {
1363	>	Object mk, mv, v;
1364	>	if ((mk = e.getKey()) == null ||
1365	>	(mv = e.getValue()) == null ||
1366	>	(v = get(mk)) == null ||
1367	>	(mv != v && !mv.equals(v)))
1368	>	return false;
1369	>	}
1370	>	}
1371	>	return true;
1372	>	}
1373	>
1374	>	/**
1375	>	* Stripped-down version of helper class used in previous version,
1376	>	* declared for the sake of serialization compatibility
1377	>	*/
1378	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1379	>	private static final long serialVersionUID = 2249069246763182397L;
1380	>	final float loadFactor;
1381	>	Segment(float lf) { this.loadFactor = lf; }
1382	>	}
1383	>
1384	>	/**
1385	>	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
1386	>	* stream (i.e., serializes it).
1387	>	* @param s the stream
1388	>	* @throws java.io.IOException if an I/O error occurs
1389	>	* @serialData
1390	>	* the key (Object) and value (Object)
1391	>	* for each key-value mapping, followed by a null pair.
1392	>	* The key-value mappings are emitted in no particular order.
1393	>	*/
1394	>	private void writeObject(java.io.ObjectOutputStream s)
1395	>	throws java.io.IOException {
1396	>	// For serialization compatibility
1397	>	// Emulate segment calculation from previous version of this class
1398	>	int sshift = 0;
1399	>	int ssize = 1;
1400	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1401	>	++sshift;
1402	>	ssize <<= 1;
1403	>	}
1404	>	int segmentShift = 32 - sshift;
1405	>	int segmentMask = ssize - 1;
1406	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1407	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1408	>	for (int i = 0; i < segments.length; ++i)
1409	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1410	>	s.putFields().put("segments", segments);
1411	>	s.putFields().put("segmentShift", segmentShift);
1412	>	s.putFields().put("segmentMask", segmentMask);
1413	>	s.writeFields();
1414	>
1415	>	Node<K,V>[] t;
1416	>	if ((t = table) != null) {
1417	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1418	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1419	>	s.writeObject(p.key);
1420	>	s.writeObject(p.val);
1421	>	}
1422	>	}
1423	>	s.writeObject(null);
1424	>	s.writeObject(null);
1425	>	segments = null; // throw away
1426	>	}
1427	>
1428	>	/**
1429	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1430	>	* @param s the stream
1431	>	* @throws ClassNotFoundException if the class of a serialized object
1432	>	*         could not be found
1433	>	* @throws java.io.IOException if an I/O error occurs
1434	>	*/
1435	>	private void readObject(java.io.ObjectInputStream s)
1436	>	throws java.io.IOException, ClassNotFoundException {
1437	>	/*
1438	>	* To improve performance in typical cases, we create nodes
1439	>	* while reading, then place in table once size is known.
1440	>	* However, we must also validate uniqueness and deal with
1441	>	* overpopulated bins while doing so, which requires
1442	>	* specialized versions of putVal mechanics.
1443	>	*/
1444	>	sizeCtl = -1; // force exclusion for table construction
1445	>	s.defaultReadObject();
1446	>	long size = 0L;
1447	>	Node<K,V> p = null;
1448	>	for (;;) {
1449	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1450	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1451	>	if (k != null && v != null) {
1452	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1453	>	++size;
1454	>	}
1455	>	else
1456	>	break;
1457	>	}
1458	>	if (size == 0L)
1459	>	sizeCtl = 0;
1460	>	else {
1461	>	int n;
1462	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1463	>	n = MAXIMUM_CAPACITY;
1464	>	else {
1465	>	int sz = (int)size;
1466	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1467	>	}
1468	>	@SuppressWarnings("unchecked")
1469	>	Node<K,V>[] tab = (Node<K,V>[])new Node<?,?>[n];
1470	>	int mask = n - 1;
1471	>	long added = 0L;
1472	>	while (p != null) {
1473	>	boolean insertAtFront;
1474	>	Node<K,V> next = p.next, first;
1475	>	int h = p.hash, j = h & mask;
1476	>	if ((first = tabAt(tab, j)) == null)
1477	>	insertAtFront = true;
1478	>	else {
1479	>	K k = p.key;
1480	>	if (first.hash < 0) {
1481	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1482	>	if (t.putTreeVal(h, k, p.val) == null)
1483	>	++added;
1484	>	insertAtFront = false;
1485	>	}
1486	>	else {
1487	>	int binCount = 0;
1488	>	insertAtFront = true;
1489	>	Node<K,V> q; K qk;
1490	>	for (q = first; q != null; q = q.next) {
1491	>	if (q.hash == h &&
1492	>	((qk = q.key) == k ||
1493	>	(qk != null && k.equals(qk)))) {
1494	>	insertAtFront = false;
1495	>	break;
1496	>	}
1497	>	++binCount;
1498	>	}
1499	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1500	>	insertAtFront = false;
1501	>	++added;
1502	>	p.next = first;
1503	>	TreeNode<K,V> hd = null, tl = null;
1504	>	for (q = p; q != null; q = q.next) {
1505	>	TreeNode<K,V> t = new TreeNode<K,V>
1506	>	(q.hash, q.key, q.val, null, null);
1507	>	if ((t.prev = tl) == null)
1508	>	hd = t;
1509	>	else
1510	>	tl.next = t;
1511	>	tl = t;
1512	>	}
1513	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1514	>	}
1515	>	}
1516	>	}
1517	>	if (insertAtFront) {
1518	>	++added;
1519	>	p.next = first;
1520	>	setTabAt(tab, j, p);
1521	>	}
1522	>	p = next;
1523	>	}
1524	>	table = tab;
1525	>	sizeCtl = n - (n >>> 2);
1526	>	baseCount = added;
1527	>	}
1528	>	}
1529	>
1530	>	// ConcurrentMap methods
1531	>
1532	>	/**
1533	>	* {@inheritDoc}
1534	>	*
1535	>	* @return the previous value associated with the specified key,
1536	>	*         or {@code null} if there was no mapping for the key
1537	>	* @throws NullPointerException if the specified key or value is null
1538	>	*/
1539	>	public V putIfAbsent(K key, V value) {
1540	>	return putVal(key, value, true);
1541	>	}
1542	>
1543	>	/**
1544	>	* {@inheritDoc}
1545	>	*
1546	>	* @throws NullPointerException if the specified key is null
1547	>	*/
1548	>	public boolean remove(Object key, Object value) {
1549	>	if (key == null)
1550	>	throw new NullPointerException();
1551	>	return value != null && replaceNode(key, null, value) != null;
1552	>	}
1553	>
1554	>	/**
1555	>	* {@inheritDoc}
1556	>	*
1557	>	* @throws NullPointerException if any of the arguments are null
1558	>	*/
1559	>	public boolean replace(K key, V oldValue, V newValue) {
1560	>	if (key == null || oldValue == null || newValue == null)
1561		throw new NullPointerException();
1562	<	return (V)internalPut(key, value);
1562	>	return replaceNode(key, newValue, oldValue) != null;
1563		}
1564
1565		/**
#	Line 2803 | Line 1569 | public class ConcurrentHashMapV8<K, V>
1569		*         or {@code null} if there was no mapping for the key
1570		* @throws NullPointerException if the specified key or value is null
1571		*/
1572	<	@SuppressWarnings("unchecked") public V putIfAbsent(K key, V value) {
1572	>	public V replace(K key, V value) {
1573		if (key == null || value == null)
1574		throw new NullPointerException();
1575	<	return (V)internalPutIfAbsent(key, value);
1575	>	return replaceNode(key, value, null);
1576		}
1577
1578	+	// Overrides of JDK8+ Map extension method defaults
1579	+
1580		/**
1581	<	* Copies all of the mappings from the specified map to this one.
1582	<	* These mappings replace any mappings that this map had for any of the
1583	<	* keys currently in the specified map.
1581	>	* Returns the value to which the specified key is mapped, or the
1582	>	* given default value if this map contains no mapping for the
1583	>	* key.
1584		*
1585	<	* @param m mappings to be stored in this map
1585	>	* @param key the key whose associated value is to be returned
1586	>	* @param defaultValue the value to return if this map contains
1587	>	* no mapping for the given key
1588	>	* @return the mapping for the key, if present; else the default value
1589	>	* @throws NullPointerException if the specified key is null
1590		*/
1591	<	public void putAll(Map<? extends K, ? extends V> m) {
1592	<	internalPutAll(m);
1591	>	public V getOrDefault(Object key, V defaultValue) {
1592	>	V v;
1593	>	return (v = get(key)) == null ? defaultValue : v;
1594	>	}
1595	>
1596	>	public void forEach(BiAction<? super K, ? super V> action) {
1597	>	if (action == null) throw new NullPointerException();
1598	>	Node<K,V>[] t;
1599	>	if ((t = table) != null) {
1600	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1601	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1602	>	action.apply(p.key, p.val);
1603	>	}
1604	>	}
1605	>	}
1606	>
1607	>	public void replaceAll(BiFun<? super K, ? super V, ? extends V> function) {
1608	>	if (function == null) throw new NullPointerException();
1609	>	Node<K,V>[] t;
1610	>	if ((t = table) != null) {
1611	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1612	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1613	>	V oldValue = p.val;
1614	>	for (K key = p.key;;) {
1615	>	V newValue = function.apply(key, oldValue);
1616	>	if (newValue == null)
1617	>	throw new NullPointerException();
1618	>	if (replaceNode(key, newValue, oldValue) != null ||
1619	>	(oldValue = get(key)) == null)
1620	>	break;
1621	>	}
1622	>	}
1623	>	}
1624		}
1625
1626		/**
1627		* If the specified key is not already associated with a value,
1628	<	* computes its value using the given mappingFunction and enters
1629	<	* it into the map unless null.  This is equivalent to
1630	<	* <pre> {@code
1631	<	* if (map.containsKey(key))
1632	<	*   return map.get(key);
1633	<	* value = mappingFunction.apply(key);
1634	<	* if (value != null)
2832	<	*   map.put(key, value);
2833	<	* return value;}</pre>
2834	<	*
2835	<	* except that the action is performed atomically.  If the
2836	<	* function returns {@code null} no mapping is recorded. If the
2837	<	* function itself throws an (unchecked) exception, the exception
2838	<	* is rethrown to its caller, and no mapping is recorded.  Some
2839	<	* attempted update operations on this map by other threads may be
2840	<	* blocked while computation is in progress, so the computation
2841	<	* should be short and simple, and must not attempt to update any
2842	<	* other mappings of this Map. The most appropriate usage is to
2843	<	* construct a new object serving as an initial mapped value, or
2844	<	* memoized result, as in:
2845	<	*
2846	<	*  <pre> {@code
2847	<	* map.computeIfAbsent(key, new Fun<K, V>() {
2848	<	*   public V map(K k) { return new Value(f(k)); }});}</pre>
1628	>	* attempts to compute its value using the given mapping function
1629	>	* and enters it into this map unless {@code null}.  The entire
1630	>	* method invocation is performed atomically, so the function is
1631	>	* applied at most once per key.  Some attempted update operations
1632	>	* on this map by other threads may be blocked while computation
1633	>	* is in progress, so the computation should be short and simple,
1634	>	* and must not attempt to update any other mappings of this map.
1635		*
1636		* @param key key with which the specified value is to be associated
1637		* @param mappingFunction the function to compute a value
#	Line 2859 | Line 1645 | public class ConcurrentHashMapV8<K, V>
1645		* @throws RuntimeException or Error if the mappingFunction does so,
1646		*         in which case the mapping is left unestablished
1647		*/
1648	<	@SuppressWarnings("unchecked") public V computeIfAbsent
2863	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
1648	>	public V computeIfAbsent(K key, Fun<? super K, ? extends V> mappingFunction) {
1649		if (key == null || mappingFunction == null)
1650		throw new NullPointerException();
1651	<	return (V)internalComputeIfAbsent(key, mappingFunction);
1651	>	int h = spread(key.hashCode());
1652	>	V val = null;
1653	>	int binCount = 0;
1654	>	for (Node<K,V>[] tab = table;;) {
1655	>	Node<K,V> f; int n, i, fh;
1656	>	if (tab == null || (n = tab.length) == 0)
1657	>	tab = initTable();
1658	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1659	>	Node<K,V> r = new ReservationNode<K,V>();
1660	>	synchronized (r) {
1661	>	if (casTabAt(tab, i, null, r)) {
1662	>	binCount = 1;
1663	>	Node<K,V> node = null;
1664	>	try {
1665	>	if ((val = mappingFunction.apply(key)) != null)
1666	>	node = new Node<K,V>(h, key, val, null);
1667	>	} finally {
1668	>	setTabAt(tab, i, node);
1669	>	}
1670	>	}
1671	>	}
1672	>	if (binCount != 0)
1673	>	break;
1674	>	}
1675	>	else if ((fh = f.hash) == MOVED)
1676	>	tab = helpTransfer(tab, f);
1677	>	else {
1678	>	boolean added = false;
1679	>	synchronized (f) {
1680	>	if (tabAt(tab, i) == f) {
1681	>	if (fh >= 0) {
1682	>	binCount = 1;
1683	>	for (Node<K,V> e = f;; ++binCount) {
1684	>	K ek; V ev;
1685	>	if (e.hash == h &&
1686	>	((ek = e.key) == key ||
1687	>	(ek != null && key.equals(ek)))) {
1688	>	val = e.val;
1689	>	break;
1690	>	}
1691	>	Node<K,V> pred = e;
1692	>	if ((e = e.next) == null) {
1693	>	if ((val = mappingFunction.apply(key)) != null) {
1694	>	added = true;
1695	>	pred.next = new Node<K,V>(h, key, val, null);
1696	>	}
1697	>	break;
1698	>	}
1699	>	}
1700	>	}
1701	>	else if (f instanceof TreeBin) {
1702	>	binCount = 2;
1703	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1704	>	TreeNode<K,V> r, p;
1705	>	if ((r = t.root) != null &&
1706	>	(p = r.findTreeNode(h, key, null)) != null)
1707	>	val = p.val;
1708	>	else if ((val = mappingFunction.apply(key)) != null) {
1709	>	added = true;
1710	>	t.putTreeVal(h, key, val);
1711	>	}
1712	>	}
1713	>	}
1714	>	}
1715	>	if (binCount != 0) {
1716	>	if (binCount >= TREEIFY_THRESHOLD)
1717	>	treeifyBin(tab, i);
1718	>	if (!added)
1719	>	return val;
1720	>	break;
1721	>	}
1722	>	}
1723	>	}
1724	>	if (val != null)
1725	>	addCount(1L, binCount);
1726	>	return val;
1727		}
1728
1729		/**
1730	<	* If the given key is present, computes a new mapping value given a key and
1731	<	* its current mapped value. This is equivalent to
1732	<	*  <pre> {@code
1733	<	*   if (map.containsKey(key)) {
1734	<	*     value = remappingFunction.apply(key, map.get(key));
1735	<	*     if (value != null)
1736	<	*       map.put(key, value);
2877	<	*     else
2878	<	*       map.remove(key);
2879	<	*   }
2880	<	* }</pre>
2881	<	*
2882	<	* except that the action is performed atomically.  If the
2883	<	* function returns {@code null}, the mapping is removed.  If the
2884	<	* function itself throws an (unchecked) exception, the exception
2885	<	* is rethrown to its caller, and the current mapping is left
2886	<	* unchanged.  Some attempted update operations on this map by
2887	<	* other threads may be blocked while computation is in progress,
2888	<	* so the computation should be short and simple, and must not
2889	<	* attempt to update any other mappings of this Map. For example,
2890	<	* to either create or append new messages to a value mapping:
1730	>	* If the value for the specified key is present, attempts to
1731	>	* compute a new mapping given the key and its current mapped
1732	>	* value.  The entire method invocation is performed atomically.
1733	>	* Some attempted update operations on this map by other threads
1734	>	* may be blocked while computation is in progress, so the
1735	>	* computation should be short and simple, and must not attempt to
1736	>	* update any other mappings of this map.
1737		*
1738	<	* @param key key with which the specified value is to be associated
1738	>	* @param key key with which a value may be associated
1739		* @param remappingFunction the function to compute a value
1740		* @return the new value associated with the specified key, or null if none
1741		* @throws NullPointerException if the specified key or remappingFunction
#	Line 2900 | Line 1746 | public class ConcurrentHashMapV8<K, V>
1746		* @throws RuntimeException or Error if the remappingFunction does so,
1747		*         in which case the mapping is unchanged
1748		*/
1749	<	@SuppressWarnings("unchecked") public V computeIfPresent
2904	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1749	>	public V computeIfPresent(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1750		if (key == null || remappingFunction == null)
1751		throw new NullPointerException();
1752	<	return (V)internalCompute(key, true, remappingFunction);
1752	>	int h = spread(key.hashCode());
1753	>	V val = null;
1754	>	int delta = 0;
1755	>	int binCount = 0;
1756	>	for (Node<K,V>[] tab = table;;) {
1757	>	Node<K,V> f; int n, i, fh;
1758	>	if (tab == null || (n = tab.length) == 0)
1759	>	tab = initTable();
1760	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1761	>	break;
1762	>	else if ((fh = f.hash) == MOVED)
1763	>	tab = helpTransfer(tab, f);
1764	>	else {
1765	>	synchronized (f) {
1766	>	if (tabAt(tab, i) == f) {
1767	>	if (fh >= 0) {
1768	>	binCount = 1;
1769	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1770	>	K ek;
1771	>	if (e.hash == h &&
1772	>	((ek = e.key) == key ||
1773	>	(ek != null && key.equals(ek)))) {
1774	>	val = remappingFunction.apply(key, e.val);
1775	>	if (val != null)
1776	>	e.val = val;
1777	>	else {
1778	>	delta = -1;
1779	>	Node<K,V> en = e.next;
1780	>	if (pred != null)
1781	>	pred.next = en;
1782	>	else
1783	>	setTabAt(tab, i, en);
1784	>	}
1785	>	break;
1786	>	}
1787	>	pred = e;
1788	>	if ((e = e.next) == null)
1789	>	break;
1790	>	}
1791	>	}
1792	>	else if (f instanceof TreeBin) {
1793	>	binCount = 2;
1794	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1795	>	TreeNode<K,V> r, p;
1796	>	if ((r = t.root) != null &&
1797	>	(p = r.findTreeNode(h, key, null)) != null) {
1798	>	val = remappingFunction.apply(key, p.val);
1799	>	if (val != null)
1800	>	p.val = val;
1801	>	else {
1802	>	delta = -1;
1803	>	if (t.removeTreeNode(p))
1804	>	setTabAt(tab, i, untreeify(t.first));
1805	>	}
1806	>	}
1807	>	}
1808	>	}
1809	>	}
1810	>	if (binCount != 0)
1811	>	break;
1812	>	}
1813	>	}
1814	>	if (delta != 0)
1815	>	addCount((long)delta, binCount);
1816	>	return val;
1817		}
1818
1819		/**
1820	<	* Computes a new mapping value given a key and
1821	<	* its current mapped value (or {@code null} if there is no current
1822	<	* mapping). This is equivalent to
1823	<	*  <pre> {@code
1824	<	*   value = remappingFunction.apply(key, map.get(key));
1825	<	*   if (value != null)
1826	<	*     map.put(key, value);
2918	<	*   else
2919	<	*     map.remove(key);
2920	<	* }</pre>
2921	<	*
2922	<	* except that the action is performed atomically.  If the
2923	<	* function returns {@code null}, the mapping is removed.  If the
2924	<	* function itself throws an (unchecked) exception, the exception
2925	<	* is rethrown to its caller, and the current mapping is left
2926	<	* unchanged.  Some attempted update operations on this map by
2927	<	* other threads may be blocked while computation is in progress,
2928	<	* so the computation should be short and simple, and must not
2929	<	* attempt to update any other mappings of this Map. For example,
2930	<	* to either create or append new messages to a value mapping:
2931	<	*
2932	<	* <pre> {@code
2933	<	* Map<Key, String> map = ...;
2934	<	* final String msg = ...;
2935	<	* map.compute(key, new BiFun<Key, String, String>() {
2936	<	*   public String apply(Key k, String v) {
2937	<	*    return (v == null) ? msg : v + msg;});}}</pre>
1820	>	* Attempts to compute a mapping for the specified key and its
1821	>	* current mapped value (or {@code null} if there is no current
1822	>	* mapping). The entire method invocation is performed atomically.
1823	>	* Some attempted update operations on this map by other threads
1824	>	* may be blocked while computation is in progress, so the
1825	>	* computation should be short and simple, and must not attempt to
1826	>	* update any other mappings of this Map.
1827		*
1828		* @param key key with which the specified value is to be associated
1829		* @param remappingFunction the function to compute a value
#	Line 2947 | Line 1836 | public class ConcurrentHashMapV8<K, V>
1836		* @throws RuntimeException or Error if the remappingFunction does so,
1837		*         in which case the mapping is unchanged
1838		*/
1839	<	@SuppressWarnings("unchecked") public V compute
1840	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1839	>	public V compute(K key,
1840	>	BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1841		if (key == null || remappingFunction == null)
1842		throw new NullPointerException();
1843	<	return (V)internalCompute(key, false, remappingFunction);
1843	>	int h = spread(key.hashCode());
1844	>	V val = null;
1845	>	int delta = 0;
1846	>	int binCount = 0;
1847	>	for (Node<K,V>[] tab = table;;) {
1848	>	Node<K,V> f; int n, i, fh;
1849	>	if (tab == null || (n = tab.length) == 0)
1850	>	tab = initTable();
1851	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1852	>	Node<K,V> r = new ReservationNode<K,V>();
1853	>	synchronized (r) {
1854	>	if (casTabAt(tab, i, null, r)) {
1855	>	binCount = 1;
1856	>	Node<K,V> node = null;
1857	>	try {
1858	>	if ((val = remappingFunction.apply(key, null)) != null) {
1859	>	delta = 1;
1860	>	node = new Node<K,V>(h, key, val, null);
1861	>	}
1862	>	} finally {
1863	>	setTabAt(tab, i, node);
1864	>	}
1865	>	}
1866	>	}
1867	>	if (binCount != 0)
1868	>	break;
1869	>	}
1870	>	else if ((fh = f.hash) == MOVED)
1871	>	tab = helpTransfer(tab, f);
1872	>	else {
1873	>	synchronized (f) {
1874	>	if (tabAt(tab, i) == f) {
1875	>	if (fh >= 0) {
1876	>	binCount = 1;
1877	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1878	>	K ek;
1879	>	if (e.hash == h &&
1880	>	((ek = e.key) == key ||
1881	>	(ek != null && key.equals(ek)))) {
1882	>	val = remappingFunction.apply(key, e.val);
1883	>	if (val != null)
1884	>	e.val = val;
1885	>	else {
1886	>	delta = -1;
1887	>	Node<K,V> 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 = remappingFunction.apply(key, null);
1898	>	if (val != null) {
1899	>	delta = 1;
1900	>	pred.next =
1901	>	new Node<K,V>(h, key, val, null);
1902	>	}
1903	>	break;
1904	>	}
1905	>	}
1906	>	}
1907	>	else if (f instanceof TreeBin) {
1908	>	binCount = 1;
1909	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1910	>	TreeNode<K,V> r, p;
1911	>	if ((r = t.root) != null)
1912	>	p = r.findTreeNode(h, key, null);
1913	>	else
1914	>	p = null;
1915	>	V pv = (p == null) ? null : p.val;
1916	>	val = remappingFunction.apply(key, pv);
1917	>	if (val != null) {
1918	>	if (p != null)
1919	>	p.val = val;
1920	>	else {
1921	>	delta = 1;
1922	>	t.putTreeVal(h, key, val);
1923	>	}
1924	>	}
1925	>	else if (p != null) {
1926	>	delta = -1;
1927	>	if (t.removeTreeNode(p))
1928	>	setTabAt(tab, i, untreeify(t.first));
1929	>	}
1930	>	}
1931	>	}
1932	>	}
1933	>	if (binCount != 0) {
1934	>	if (binCount >= TREEIFY_THRESHOLD)
1935	>	treeifyBin(tab, i);
1936	>	break;
1937	>	}
1938	>	}
1939	>	}
1940	>	if (delta != 0)
1941	>	addCount((long)delta, binCount);
1942	>	return val;
1943		}
1944
1945		/**
1946	<	* If the specified key is not already associated
1947	<	* with a value, associate it with the given value.
1948	<	* Otherwise, replace the value with the results of
1949	<	* the given remapping function. This is equivalent to:
1950	<	*  <pre> {@code
1951	<	*   if (!map.containsKey(key))
1952	<	*     map.put(value);
1953	<	*   else {
1954	<	*     newValue = remappingFunction.apply(map.get(key), value);
1955	<	*     if (value != null)
1956	<	*       map.put(key, value);
1957	<	*     else
1958	<	*       map.remove(key);
1959	<	*   }
1960	<	* }</pre>
1961	<	* except that the action is performed atomically.  If the
1962	<	* function returns {@code null}, the mapping is removed.  If the
1963	<	* function itself throws an (unchecked) exception, the exception
2976	<	* is rethrown to its caller, and the current mapping is left
2977	<	* unchanged.  Some attempted update operations on this map by
2978	<	* other threads may be blocked while computation is in progress,
2979	<	* so the computation should be short and simple, and must not
2980	<	* attempt to update any other mappings of this Map.
1946	>	* If the specified key is not already associated with a
1947	>	* (non-null) value, associates it with the given value.
1948	>	* Otherwise, replaces the value with the results of the given
1949	>	* remapping function, or removes if {@code null}. The entire
1950	>	* method invocation is performed atomically.  Some attempted
1951	>	* update operations on this map by other threads may be blocked
1952	>	* while computation is in progress, so the computation should be
1953	>	* short and simple, and must not attempt to update any other
1954	>	* mappings of this Map.
1955	>	*
1956	>	* @param key key with which the specified value is to be associated
1957	>	* @param value the value to use if absent
1958	>	* @param remappingFunction the function to recompute a value if present
1959	>	* @return the new value associated with the specified key, or null if none
1960	>	* @throws NullPointerException if the specified key or the
1961	>	*         remappingFunction is null
1962	>	* @throws RuntimeException or Error if the remappingFunction does so,
1963	>	*         in which case the mapping is unchanged
1964		*/
1965	<	@SuppressWarnings("unchecked") public V merge
2983	<	(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1965	>	public V merge(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1966		if (key == null || value == null || remappingFunction == null)
1967		throw new NullPointerException();
1968	<	return (V)internalMerge(key, value, remappingFunction);
1968	>	int h = spread(key.hashCode());
1969	>	V val = null;
1970	>	int delta = 0;
1971	>	int binCount = 0;
1972	>	for (Node<K,V>[] tab = table;;) {
1973	>	Node<K,V> f; int n, i, fh;
1974	>	if (tab == null || (n = tab.length) == 0)
1975	>	tab = initTable();
1976	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1977	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1978	>	delta = 1;
1979	>	val = value;
1980	>	break;
1981	>	}
1982	>	}
1983	>	else if ((fh = f.hash) == MOVED)
1984	>	tab = helpTransfer(tab, f);
1985	>	else {
1986	>	synchronized (f) {
1987	>	if (tabAt(tab, i) == f) {
1988	>	if (fh >= 0) {
1989	>	binCount = 1;
1990	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1991	>	K ek;
1992	>	if (e.hash == h &&
1993	>	((ek = e.key) == key ||
1994	>	(ek != null && key.equals(ek)))) {
1995	>	val = remappingFunction.apply(e.val, value);
1996	>	if (val != null)
1997	>	e.val = val;
1998	>	else {
1999	>	delta = -1;
2000	>	Node<K,V> en = e.next;
2001	>	if (pred != null)
2002	>	pred.next = en;
2003	>	else
2004	>	setTabAt(tab, i, en);
2005	>	}
2006	>	break;
2007	>	}
2008	>	pred = e;
2009	>	if ((e = e.next) == null) {
2010	>	delta = 1;
2011	>	val = value;
2012	>	pred.next =
2013	>	new Node<K,V>(h, key, val, null);
2014	>	break;
2015	>	}
2016	>	}
2017	>	}
2018	>	else if (f instanceof TreeBin) {
2019	>	binCount = 2;
2020	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2021	>	TreeNode<K,V> r = t.root;
2022	>	TreeNode<K,V> p = (r == null) ? null :
2023	>	r.findTreeNode(h, key, null);
2024	>	val = (p == null) ? value :
2025	>	remappingFunction.apply(p.val, value);
2026	>	if (val != null) {
2027	>	if (p != null)
2028	>	p.val = val;
2029	>	else {
2030	>	delta = 1;
2031	>	t.putTreeVal(h, key, val);
2032	>	}
2033	>	}
2034	>	else if (p != null) {
2035	>	delta = -1;
2036	>	if (t.removeTreeNode(p))
2037	>	setTabAt(tab, i, untreeify(t.first));
2038	>	}
2039	>	}
2040	>	}
2041	>	}
2042	>	if (binCount != 0) {
2043	>	if (binCount >= TREEIFY_THRESHOLD)
2044	>	treeifyBin(tab, i);
2045	>	break;
2046	>	}
2047	>	}
2048	>	}
2049	>	if (delta != 0)
2050	>	addCount((long)delta, binCount);
2051	>	return val;
2052		}
2053
2054	+	// Hashtable legacy methods
2055	+
2056		/**
2057	<	* Removes the key (and its corresponding value) from this map.
2058	<	* This method does nothing if the key is not in the map.
2057	>	* Legacy method testing if some key maps into the specified value
2058	>	* in this table.  This method is identical in functionality to
2059	>	* {@link #containsValue(Object)}, and exists solely to ensure
2060	>	* full compatibility with class {@link java.util.Hashtable},
2061	>	* which supported this method prior to introduction of the
2062	>	* Java Collections framework.
2063		*
2064	<	* @param  key the key that needs to be removed
2065	<	* @return the previous value associated with {@code key}, or
2066	<	*         {@code null} if there was no mapping for {@code key}
2067	<	* @throws NullPointerException if the specified key is null
2064	>	* @param  value a value to search for
2065	>	* @return {@code true} if and only if some key maps to the
2066	>	*         {@code value} argument in this table as
2067	>	*         determined by the {@code equals} method;
2068	>	*         {@code false} otherwise
2069	>	* @throws NullPointerException if the specified value is null
2070		*/
2071	<	@SuppressWarnings("unchecked") public V remove(Object key) {
2072	<	if (key == null)
3000	<	throw new NullPointerException();
3001	<	return (V)internalReplace(key, null, null);
2071	>	@Deprecated public boolean contains(Object value) {
2072	>	return containsValue(value);
2073		}
2074
2075		/**
2076	<	* {@inheritDoc}
2076	>	* Returns an enumeration of the keys in this table.
2077		*
2078	<	* @throws NullPointerException if the specified key is null
2078	>	* @return an enumeration of the keys in this table
2079	>	* @see #keySet()
2080		*/
2081	<	public boolean remove(Object key, Object value) {
2082	<	if (key == null)
2083	<	throw new NullPointerException();
2084	<	if (value == null)
3013	<	return false;
3014	<	return internalReplace(key, null, value) != null;
2081	>	public Enumeration<K> keys() {
2082	>	Node<K,V>[] t;
2083	>	int f = (t = table) == null ? 0 : t.length;
2084	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2085		}
2086
2087		/**
2088	<	* {@inheritDoc}
2088	>	* Returns an enumeration of the values in this table.
2089		*
2090	<	* @throws NullPointerException if any of the arguments are null
2090	>	* @return an enumeration of the values in this table
2091	>	* @see #values()
2092		*/
2093	<	public boolean replace(K key, V oldValue, V newValue) {
2094	<	if (key == null || oldValue == null || newValue == null)
2095	<	throw new NullPointerException();
2096	<	return internalReplace(key, newValue, oldValue) != null;
2093	>	public Enumeration<V> elements() {
2094	>	Node<K,V>[] t;
2095	>	int f = (t = table) == null ? 0 : t.length;
2096	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2097		}
2098
2099	+	// ConcurrentHashMapV8-only methods
2100	+
2101		/**
2102	<	* {@inheritDoc}
2102	>	* Returns the number of mappings. This method should be used
2103	>	* instead of {@link #size} because a ConcurrentHashMapV8 may
2104	>	* contain more mappings than can be represented as an int. The
2105	>	* value returned is an estimate; the actual count may differ if
2106	>	* there are concurrent insertions or removals.
2107		*
2108	<	* @return the previous value associated with the specified key,
2109	<	*         or {@code null} if there was no mapping for the key
3033	<	* @throws NullPointerException if the specified key or value is null
2108	>	* @return the number of mappings
2109	>	* @since 1.8
2110		*/
2111	<	@SuppressWarnings("unchecked") public V replace(K key, V value) {
2112	<	if (key == null || value == null)
2113	<	throw new NullPointerException();
3038	<	return (V)internalReplace(key, value, null);
2111	>	public long mappingCount() {
2112	>	long n = sumCount();
2113	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2114		}
2115
2116		/**
2117	<	* Removes all of the mappings from this map.
2117	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2118	>	* from the given type to {@code Boolean.TRUE}.
2119	>	*
2120	>	* @return the new set
2121	>	* @since 1.8
2122		*/
2123	<	public void clear() {
2124	<	internalClear();
2123	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2124	>	return new KeySetView<K,Boolean>
2125	>	(new ConcurrentHashMapV8<K,Boolean>(), Boolean.TRUE);
2126		}
2127
2128		/**
2129	<	* Returns a {@link Set} view of the keys contained in this map.
2130	<	* The set is backed by the map, so changes to the map are
3051	<	* reflected in the set, and vice-versa.
2129	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2130	>	* from the given type to {@code Boolean.TRUE}.
2131		*
2132	<	* @return the set view
2132	>	* @param initialCapacity The implementation performs internal
2133	>	* sizing to accommodate this many elements.
2134	>	* @return the new set
2135	>	* @throws IllegalArgumentException if the initial capacity of
2136	>	* elements is negative
2137	>	* @since 1.8
2138		*/
2139	<	public KeySetView<K,V> keySet() {
2140	<	KeySetView<K,V> ks = keySet;
2141	<	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2139	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2140	>	return new KeySetView<K,Boolean>
2141	>	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2142		}
2143
2144		/**
2145		* Returns a {@link Set} view of the keys in this map, using the
2146		* given common mapped value for any additions (i.e., {@link
2147	<	* Collection#add} and {@link Collection#addAll}). This is of
2148	<	* course only appropriate if it is acceptable to use the same
2149	<	* value for all additions from this view.
2147	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2148	>	* This is of course only appropriate if it is acceptable to use
2149	>	* the same value for all additions from this view.
2150		*
2151	<	* @param mappedValue the mapped value to use for any
3068	<	* additions.
2151	>	* @param mappedValue the mapped value to use for any additions
2152		* @return the set view
2153		* @throws NullPointerException if the mappedValue is null
2154		*/
#	Line 3075 | Line 2158 | public class ConcurrentHashMapV8<K, V>
2158		return new KeySetView<K,V>(this, mappedValue);
2159		}
2160
2161	+	/* ---------------- Special Nodes -------------- */
2162	+
2163		/**
2164	<	* Returns a {@link Collection} view of the values contained in this map.
3080	<	* The collection is backed by the map, so changes to the map are
3081	<	* reflected in the collection, and vice-versa.  The collection
3082	<	* supports element removal, which removes the corresponding
3083	<	* mapping from this map, via the {@code Iterator.remove},
3084	<	* {@code Collection.remove}, {@code removeAll},
3085	<	* {@code retainAll}, and {@code clear} operations.  It does not
3086	<	* support the {@code add} or {@code addAll} operations.
3087	<	*
3088	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
3089	<	* that will never throw {@link ConcurrentModificationException},
3090	<	* and guarantees to traverse elements as they existed upon
3091	<	* construction of the iterator, and may (but is not guaranteed to)
3092	<	* reflect any modifications subsequent to construction.
2164	>	* A node inserted at head of bins during transfer operations.
2165		*/
2166	<	public Collection<V> values() {
2167	<	Values<K,V> vs = values;
2168	<	return (vs != null) ? vs : (values = new Values<K,V>(this));
2166	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2167	>	final Node<K,V>[] nextTable;
2168	>	ForwardingNode(Node<K,V>[] tab) {
2169	>	super(MOVED, null, null, null);
2170	>	this.nextTable = tab;
2171	>	}
2172	>
2173	>	Node<K,V> find(int h, Object k) {
2174	>	// loop to avoid arbitrarily deep recursion on forwarding nodes
2175	>	outer: for (Node<K,V>[] tab = nextTable;;) {
2176	>	Node<K,V> e; int n;
2177	>	if (k == null || tab == null || (n = tab.length) == 0 ||
2178	>	(e = tabAt(tab, (n - 1) & h)) == null)
2179	>	return null;
2180	>	for (;;) {
2181	>	int eh; K ek;
2182	>	if ((eh = e.hash) == h &&
2183	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2184	>	return e;
2185	>	if (eh < 0) {
2186	>	if (e instanceof ForwardingNode) {
2187	>	tab = ((ForwardingNode<K,V>)e).nextTable;
2188	>	continue outer;
2189	>	}
2190	>	else
2191	>	return e.find(h, k);
2192	>	}
2193	>	if ((e = e.next) == null)
2194	>	return null;
2195	>	}
2196	>	}
2197	>	}
2198		}
2199
2200		/**
2201	<	* Returns a {@link Set} view of the mappings contained in this map.
3101	<	* The set is backed by the map, so changes to the map are
3102	<	* reflected in the set, and vice-versa.  The set supports element
3103	<	* removal, which removes the corresponding mapping from the map,
3104	<	* via the {@code Iterator.remove}, {@code Set.remove},
3105	<	* {@code removeAll}, {@code retainAll}, and {@code clear}
3106	<	* operations.  It does not support the {@code add} or
3107	<	* {@code addAll} operations.
3108	<	*
3109	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
3110	<	* that will never throw {@link ConcurrentModificationException},
3111	<	* and guarantees to traverse elements as they existed upon
3112	<	* construction of the iterator, and may (but is not guaranteed to)
3113	<	* reflect any modifications subsequent to construction.
2201	>	* A place-holder node used in computeIfAbsent and compute
2202		*/
2203	<	public Set<Map.Entry<K,V>> entrySet() {
2204	<	EntrySet<K,V> es = entrySet;
2205	<	return (es != null) ? es : (entrySet = new EntrySet<K,V>(this));
2203	>	static final class ReservationNode<K,V> extends Node<K,V> {
2204	>	ReservationNode() {
2205	>	super(RESERVED, null, null, null);
2206	>	}
2207	>
2208	>	Node<K,V> find(int h, Object k) {
2209	>	return null;
2210	>	}
2211		}
2212
2213	+	/* ---------------- Table Initialization and Resizing -------------- */
2214	+
2215		/**
2216	<	* Returns an enumeration of the keys in this table.
2217	<	*
3123	<	* @return an enumeration of the keys in this table
3124	<	* @see #keySet()
2216	>	* Returns the stamp bits for resizing a table of size n.
2217	>	* Must be negative when shifted left by RESIZE_STAMP_SHIFT.
2218		*/
2219	<	public Enumeration<K> keys() {
2220	<	return new KeyIterator<K,V>(this);
2219	>	static final int resizeStamp(int n) {
2220	>	return Integer.numberOfLeadingZeros(n) | (1 << (RESIZE_STAMP_BITS - 1));
2221		}
2222
2223		/**
2224	<	* Returns an enumeration of the values in this table.
3132	<	*
3133	<	* @return an enumeration of the values in this table
3134	<	* @see #values()
2224	>	* Initializes table, using the size recorded in sizeCtl.
2225		*/
2226	<	public Enumeration<V> elements() {
2227	<	return new ValueIterator<K,V>(this);
2226	>	private final Node<K,V>[] initTable() {
2227	>	Node<K,V>[] tab; int sc;
2228	>	while ((tab = table) == null || tab.length == 0) {
2229	>	if ((sc = sizeCtl) < 0)
2230	>	Thread.yield(); // lost initialization race; just spin
2231	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2232	>	try {
2233	>	if ((tab = table) == null || tab.length == 0) {
2234	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2235	>	@SuppressWarnings("unchecked")
2236	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2237	>	table = tab = nt;
2238	>	sc = n - (n >>> 2);
2239	>	}
2240	>	} finally {
2241	>	sizeCtl = sc;
2242	>	}
2243	>	break;
2244	>	}
2245	>	}
2246	>	return tab;
2247		}
2248
2249		/**
2250	<	* Returns a partitionable iterator of the keys in this map.
2251	<	*
2252	<	* @return a partitionable iterator of the keys in this map
2250	>	* Adds to count, and if table is too small and not already
2251	>	* resizing, initiates transfer. If already resizing, helps
2252	>	* perform transfer if work is available.  Rechecks occupancy
2253	>	* after a transfer to see if another resize is already needed
2254	>	* because resizings are lagging additions.
2255	>	*
2256	>	* @param x the count to add
2257	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
2258	>	*/
2259	>	private final void addCount(long x, int check) {
2260	>	CounterCell[] as; long b, s;
2261	>	if ((as = counterCells) != null ||
2262	>	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2263	>	CounterHashCode hc; CounterCell a; long v; int m;
2264	>	boolean uncontended = true;
2265	>	if ((hc = threadCounterHashCode.get()) == null ||
2266	>	as == null || (m = as.length - 1) < 0 ||
2267	>	(a = as[m & hc.code]) == null ||
2268	>	!(uncontended =
2269	>	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
2270	>	fullAddCount(x, hc, uncontended);
2271	>	return;
2272	>	}
2273	>	if (check <= 1)
2274	>	return;
2275	>	s = sumCount();
2276	>	}
2277	>	if (check >= 0) {
2278	>	Node<K,V>[] tab, nt; int n, sc;
2279	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2280	>	(n = tab.length) < MAXIMUM_CAPACITY) {
2281	>	int rs = resizeStamp(n);
2282	>	if (sc < 0) {
2283	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2284	>	sc == rs + MAX_RESIZERS || (nt = nextTable) == null ||
2285	>	transferIndex <= 0)
2286	>	break;
2287	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1))
2288	>	transfer(tab, nt);
2289	>	}
2290	>	else if (U.compareAndSwapInt(this, SIZECTL, sc,
2291	>	(rs << RESIZE_STAMP_SHIFT) + 2))
2292	>	transfer(tab, null);
2293	>	s = sumCount();
2294	>	}
2295	>	}
2296	>	}
2297	>
2298	>	/**
2299	>	* Helps transfer if a resize is in progress.
2300		*/
2301	<	public Spliterator<K> keySpliterator() {
2302	<	return new KeyIterator<K,V>(this);
2301	>	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2302	>	Node<K,V>[] nextTab; int sc;
2303	>	if (tab != null && (f instanceof ForwardingNode) &&
2304	>	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2305	>	int rs = resizeStamp(tab.length);
2306	>	while (nextTab == nextTable && table == tab &&
2307	>	(sc = sizeCtl) < 0) {
2308	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2309	>	sc == rs + MAX_RESIZERS || transferIndex <= 0)
2310	>	break;
2311	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1)) {
2312	>	transfer(tab, nextTab);
2313	>	break;
2314	>	}
2315	>	}
2316	>	return nextTab;
2317	>	}
2318	>	return table;
2319		}
2320
2321		/**
2322	<	* Returns a partitionable iterator of the values in this map.
2322	>	* Tries to presize table to accommodate the given number of elements.
2323		*
2324	<	* @return a partitionable iterator of the values in this map
2324	>	* @param size number of elements (doesn't need to be perfectly accurate)
2325		*/
2326	<	public Spliterator<V> valueSpliterator() {
2327	<	return new ValueIterator<K,V>(this);
2326	>	private final void tryPresize(int size) {
2327	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2328	>	tableSizeFor(size + (size >>> 1) + 1);
2329	>	int sc;
2330	>	while ((sc = sizeCtl) >= 0) {
2331	>	Node<K,V>[] tab = table; int n;
2332	>	if (tab == null || (n = tab.length) == 0) {
2333	>	n = (sc > c) ? sc : c;
2334	>	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2335	>	try {
2336	>	if (table == tab) {
2337	>	@SuppressWarnings("unchecked")
2338	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2339	>	table = nt;
2340	>	sc = n - (n >>> 2);
2341	>	}
2342	>	} finally {
2343	>	sizeCtl = sc;
2344	>	}
2345	>	}
2346	>	}
2347	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2348	>	break;
2349	>	else if (tab == table) {
2350	>	int rs = resizeStamp(n);
2351	>	if (sc < 0) {
2352	>	Node<K,V>[] nt;
2353	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2354	>	sc == rs + MAX_RESIZERS || (nt = nextTable) == null ||
2355	>	transferIndex <= 0)
2356	>	break;
2357	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1))
2358	>	transfer(tab, nt);
2359	>	}
2360	>	else if (U.compareAndSwapInt(this, SIZECTL, sc,
2361	>	(rs << RESIZE_STAMP_SHIFT) + 2))
2362	>	transfer(tab, null);
2363	>	}
2364	>	}
2365		}
2366
2367		/**
2368	<	* Returns a partitionable iterator of the entries in this map.
2369	<	*
2370	<	* @return a partitionable iterator of the entries in this map
2368	>	* Moves and/or copies the nodes in each bin to new table. See
2369	>	* above for explanation.
2370	>	*/
2371	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2372	>	int n = tab.length, stride;
2373	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2374	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
2375	>	if (nextTab == null) {            // initiating
2376	>	try {
2377	>	@SuppressWarnings("unchecked")
2378	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n << 1];
2379	>	nextTab = nt;
2380	>	} catch (Throwable ex) {      // try to cope with OOME
2381	>	sizeCtl = Integer.MAX_VALUE;
2382	>	return;
2383	>	}
2384	>	nextTable = nextTab;
2385	>	transferIndex = n;
2386	>	}
2387	>	int nextn = nextTab.length;
2388	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2389	>	boolean advance = true;
2390	>	boolean finishing = false; // to ensure sweep before committing nextTab
2391	>	for (int i = 0, bound = 0;;) {
2392	>	Node<K,V> f; int fh;
2393	>	while (advance) {
2394	>	int nextIndex, nextBound;
2395	>	if (--i >= bound || finishing)
2396	>	advance = false;
2397	>	else if ((nextIndex = transferIndex) <= 0) {
2398	>	i = -1;
2399	>	advance = false;
2400	>	}
2401	>	else if (U.compareAndSwapInt
2402	>	(this, TRANSFERINDEX, nextIndex,
2403	>	nextBound = (nextIndex > stride ?
2404	>	nextIndex - stride : 0))) {
2405	>	bound = nextBound;
2406	>	i = nextIndex - 1;
2407	>	advance = false;
2408	>	}
2409	>	}
2410	>	if (i < 0 || i >= n || i + n >= nextn) {
2411	>	int sc;
2412	>	if (finishing) {
2413	>	nextTable = null;
2414	>	table = nextTab;
2415	>	sizeCtl = (n << 1) - (n >>> 1);
2416	>	return;
2417	>	}
2418	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, sc - 1)) {
2419	>	if ((sc - 2) != resizeStamp(n) << RESIZE_STAMP_SHIFT)
2420	>	return;
2421	>	finishing = advance = true;
2422	>	i = n; // recheck before commit
2423	>	}
2424	>	}
2425	>	else if ((f = tabAt(tab, i)) == null)
2426	>	advance = casTabAt(tab, i, null, fwd);
2427	>	else if ((fh = f.hash) == MOVED)
2428	>	advance = true; // already processed
2429	>	else {
2430	>	synchronized (f) {
2431	>	if (tabAt(tab, i) == f) {
2432	>	Node<K,V> ln, hn;
2433	>	if (fh >= 0) {
2434	>	int runBit = fh & n;
2435	>	Node<K,V> lastRun = f;
2436	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2437	>	int b = p.hash & n;
2438	>	if (b != runBit) {
2439	>	runBit = b;
2440	>	lastRun = p;
2441	>	}
2442	>	}
2443	>	if (runBit == 0) {
2444	>	ln = lastRun;
2445	>	hn = null;
2446	>	}
2447	>	else {
2448	>	hn = lastRun;
2449	>	ln = null;
2450	>	}
2451	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2452	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2453	>	if ((ph & n) == 0)
2454	>	ln = new Node<K,V>(ph, pk, pv, ln);
2455	>	else
2456	>	hn = new Node<K,V>(ph, pk, pv, hn);
2457	>	}
2458	>	setTabAt(nextTab, i, ln);
2459	>	setTabAt(nextTab, i + n, hn);
2460	>	setTabAt(tab, i, fwd);
2461	>	advance = true;
2462	>	}
2463	>	else if (f instanceof TreeBin) {
2464	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2465	>	TreeNode<K,V> lo = null, loTail = null;
2466	>	TreeNode<K,V> hi = null, hiTail = null;
2467	>	int lc = 0, hc = 0;
2468	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2469	>	int h = e.hash;
2470	>	TreeNode<K,V> p = new TreeNode<K,V>
2471	>	(h, e.key, e.val, null, null);
2472	>	if ((h & n) == 0) {
2473	>	if ((p.prev = loTail) == null)
2474	>	lo = p;
2475	>	else
2476	>	loTail.next = p;
2477	>	loTail = p;
2478	>	++lc;
2479	>	}
2480	>	else {
2481	>	if ((p.prev = hiTail) == null)
2482	>	hi = p;
2483	>	else
2484	>	hiTail.next = p;
2485	>	hiTail = p;
2486	>	++hc;
2487	>	}
2488	>	}
2489	>	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2490	>	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2491	>	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2492	>	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2493	>	setTabAt(nextTab, i, ln);
2494	>	setTabAt(nextTab, i + n, hn);
2495	>	setTabAt(tab, i, fwd);
2496	>	advance = true;
2497	>	}
2498	>	}
2499	>	}
2500	>	}
2501	>	}
2502	>	}
2503	>
2504	>	/* ---------------- Conversion from/to TreeBins -------------- */
2505	>
2506	>	/**
2507	>	* Replaces all linked nodes in bin at given index unless table is
2508	>	* too small, in which case resizes instead.
2509		*/
2510	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2511	<	return new EntryIterator<K,V>(this);
2510	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2511	>	Node<K,V> b; int n, sc;
2512	>	if (tab != null) {
2513	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY)
2514	>	tryPresize(n << 1);
2515	>	else if ((b = tabAt(tab, index)) != null && b.hash >= 0) {
2516	>	synchronized (b) {
2517	>	if (tabAt(tab, index) == b) {
2518	>	TreeNode<K,V> hd = null, tl = null;
2519	>	for (Node<K,V> e = b; e != null; e = e.next) {
2520	>	TreeNode<K,V> p =
2521	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2522	>	null, null);
2523	>	if ((p.prev = tl) == null)
2524	>	hd = p;
2525	>	else
2526	>	tl.next = p;
2527	>	tl = p;
2528	>	}
2529	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2530	>	}
2531	>	}
2532	>	}
2533	>	}
2534		}
2535
2536		/**
2537	<	* Returns the hash code value for this {@link Map}, i.e.,
3169	<	* the sum of, for each key-value pair in the map,
3170	<	* {@code key.hashCode() ^ value.hashCode()}.
3171	<	*
3172	<	* @return the hash code value for this map
2537	>	* Returns a list on non-TreeNodes replacing those in given list.
2538		*/
2539	<	public int hashCode() {
2540	<	int h = 0;
2541	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2542	<	Object v;
2543	<	while ((v = it.advance()) != null) {
2544	<	h += it.nextKey.hashCode() ^ v.hashCode();
2539	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2540	>	Node<K,V> hd = null, tl = null;
2541	>	for (Node<K,V> q = b; q != null; q = q.next) {
2542	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2543	>	if (tl == null)
2544	>	hd = p;
2545	>	else
2546	>	tl.next = p;
2547	>	tl = p;
2548		}
2549	<	return h;
2549	>	return hd;
2550		}
2551
2552	+	/* ---------------- TreeNodes -------------- */
2553	+
2554		/**
2555	<	* Returns a string representation of this map.  The string
3186	<	* representation consists of a list of key-value mappings (in no
3187	<	* particular order) enclosed in braces ("{@code {}}").  Adjacent
3188	<	* mappings are separated by the characters {@code ", "} (comma
3189	<	* and space).  Each key-value mapping is rendered as the key
3190	<	* followed by an equals sign ("{@code =}") followed by the
3191	<	* associated value.
3192	<	*
3193	<	* @return a string representation of this map
2555	>	* Nodes for use in TreeBins
2556		*/
2557	<	public String toString() {
2558	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2559	<	StringBuilder sb = new StringBuilder();
2560	<	sb.append('{');
2561	<	Object v;
2562	<	if ((v = it.advance()) != null) {
2563	<	for (;;) {
2564	<	Object k = it.nextKey;
2565	<	sb.append(k == this ? "(this Map)" : k);
2566	<	sb.append('=');
2567	<	sb.append(v == this ? "(this Map)" : v);
2568	<	if ((v = it.advance()) == null)
2557	>	static final class TreeNode<K,V> extends Node<K,V> {
2558	>	TreeNode<K,V> parent;  // red-black tree links
2559	>	TreeNode<K,V> left;
2560	>	TreeNode<K,V> right;
2561	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2562	>	boolean red;
2563	>
2564	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2565	>	TreeNode<K,V> parent) {
2566	>	super(hash, key, val, next);
2567	>	this.parent = parent;
2568	>	}
2569	>
2570	>	Node<K,V> find(int h, Object k) {
2571	>	return findTreeNode(h, k, null);
2572	>	}
2573	>
2574	>	/**
2575	>	* Returns the TreeNode (or null if not found) for the given key
2576	>	* starting at given root.
2577	>	*/
2578	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2579	>	if (k != null) {
2580	>	TreeNode<K,V> p = this;
2581	>	do {
2582	>	int ph, dir; K pk; TreeNode<K,V> q;
2583	>	TreeNode<K,V> pl = p.left, pr = p.right;
2584	>	if ((ph = p.hash) > h)
2585	>	p = pl;
2586	>	else if (ph < h)
2587	>	p = pr;
2588	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2589	>	return p;
2590	>	else if (pl == null)
2591	>	p = pr;
2592	>	else if (pr == null)
2593	>	p = pl;
2594	>	else if ((kc != null ||
2595	>	(kc = comparableClassFor(k)) != null) &&
2596	>	(dir = compareComparables(kc, k, pk)) != 0)
2597	>	p = (dir < 0) ? pl : pr;
2598	>	else if ((q = pr.findTreeNode(h, k, kc)) != null)
2599	>	return q;
2600	>	else
2601	>	p = pl;
2602	>	} while (p != null);
2603	>	}
2604	>	return null;
2605	>	}
2606	>	}
2607	>
2608	>	/* ---------------- TreeBins -------------- */
2609	>
2610	>	/**
2611	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2612	>	* keys or values, but instead point to list of TreeNodes and
2613	>	* their root. They also maintain a parasitic read-write lock
2614	>	* forcing writers (who hold bin lock) to wait for readers (who do
2615	>	* not) to complete before tree restructuring operations.
2616	>	*/
2617	>	static final class TreeBin<K,V> extends Node<K,V> {
2618	>	TreeNode<K,V> root;
2619	>	volatile TreeNode<K,V> first;
2620	>	volatile Thread waiter;
2621	>	volatile int lockState;
2622	>	// values for lockState
2623	>	static final int WRITER = 1; // set while holding write lock
2624	>	static final int WAITER = 2; // set when waiting for write lock
2625	>	static final int READER = 4; // increment value for setting read lock
2626	>
2627	>	/**
2628	>	* Tie-breaking utility for ordering insertions when equal
2629	>	* hashCodes and non-comparable. We don't require a total
2630	>	* order, just a consistent insertion rule to maintain
2631	>	* equivalence across rebalancings. Tie-breaking further than
2632	>	* necessary simplifies testing a bit.
2633	>	*/
2634	>	static int tieBreakOrder(Object a, Object b) {
2635	>	int d;
2636	>	if (a == null || b == null ||
2637	>	(d = a.getClass().getName().
2638	>	compareTo(b.getClass().getName())) == 0)
2639	>	d = (System.identityHashCode(a) <= System.identityHashCode(b) ?
2640	>	-1 : 1);
2641	>	return d;
2642	>	}
2643	>
2644	>	/**
2645	>	* Creates bin with initial set of nodes headed by b.
2646	>	*/
2647	>	TreeBin(TreeNode<K,V> b) {
2648	>	super(TREEBIN, null, null, null);
2649	>	this.first = b;
2650	>	TreeNode<K,V> r = null;
2651	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2652	>	next = (TreeNode<K,V>)x.next;
2653	>	x.left = x.right = null;
2654	>	if (r == null) {
2655	>	x.parent = null;
2656	>	x.red = false;
2657	>	r = x;
2658	>	}
2659	>	else {
2660	>	K k = x.key;
2661	>	int h = x.hash;
2662	>	Class<?> kc = null;
2663	>	for (TreeNode<K,V> p = r;;) {
2664	>	int dir, ph;
2665	>	K pk = p.key;
2666	>	if ((ph = p.hash) > h)
2667	>	dir = -1;
2668	>	else if (ph < h)
2669	>	dir = 1;
2670	>	else if ((kc == null &&
2671	>	(kc = comparableClassFor(k)) == null) ||
2672	>	(dir = compareComparables(kc, k, pk)) == 0)
2673	>	dir = tieBreakOrder(k, pk);
2674	>	TreeNode<K,V> xp = p;
2675	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2676	>	x.parent = xp;
2677	>	if (dir <= 0)
2678	>	xp.left = x;
2679	>	else
2680	>	xp.right = x;
2681	>	r = balanceInsertion(r, x);
2682	>	break;
2683	>	}
2684	>	}
2685	>	}
2686	>	}
2687	>	this.root = r;
2688	>	assert checkInvariants(root);
2689	>	}
2690	>
2691	>	/**
2692	>	* Acquires write lock for tree restructuring.
2693	>	*/
2694	>	private final void lockRoot() {
2695	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2696	>	contendedLock(); // offload to separate method
2697	>	}
2698	>
2699	>	/**
2700	>	* Releases write lock for tree restructuring.
2701	>	*/
2702	>	private final void unlockRoot() {
2703	>	lockState = 0;
2704	>	}
2705	>
2706	>	/**
2707	>	* Possibly blocks awaiting root lock.
2708	>	*/
2709	>	private final void contendedLock() {
2710	>	boolean waiting = false;
2711	>	for (int s;;) {
2712	>	if (((s = lockState) & ~WAITER) == 0) {
2713	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2714	>	if (waiting)
2715	>	waiter = null;
2716	>	return;
2717	>	}
2718	>	}
2719	>	else if ((s & WAITER) == 0) {
2720	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2721	>	waiting = true;
2722	>	waiter = Thread.currentThread();
2723	>	}
2724	>	}
2725	>	else if (waiting)
2726	>	LockSupport.park(this);
2727	>	}
2728	>	}
2729	>
2730	>	/**
2731	>	* Returns matching node or null if none. Tries to search
2732	>	* using tree comparisons from root, but continues linear
2733	>	* search when lock not available.
2734	>	*/
2735	>	final Node<K,V> find(int h, Object k) {
2736	>	if (k != null) {
2737	>	for (Node<K,V> e = first; e != null; ) {
2738	>	int s; K ek;
2739	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2740	>	if (e.hash == h &&
2741	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2742	>	return e;
2743	>	e = e.next;
2744	>	}
2745	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2746	>	s + READER)) {
2747	>	TreeNode<K,V> r, p;
2748	>	try {
2749	>	p = ((r = root) == null ? null :
2750	>	r.findTreeNode(h, k, null));
2751	>	} finally {
2752	>	Thread w;
2753	>	int ls;
2754	>	do {} while (!U.compareAndSwapInt
2755	>	(this, LOCKSTATE,
2756	>	ls = lockState, ls - READER));
2757	>	if (ls == (READER|WAITER) && (w = waiter) != null)
2758	>	LockSupport.unpark(w);
2759	>	}
2760	>	return p;
2761	>	}
2762	>	}
2763	>	}
2764	>	return null;
2765	>	}
2766	>
2767	>	/**
2768	>	* Finds or adds a node.
2769	>	* @return null if added
2770	>	*/
2771	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2772	>	Class<?> kc = null;
2773	>	boolean searched = false;
2774	>	for (TreeNode<K,V> p = root;;) {
2775	>	int dir, ph; K pk;
2776	>	if (p == null) {
2777	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2778		break;
2779	<	sb.append(',').append(' ');
2779	>	}
2780	>	else if ((ph = p.hash) > h)
2781	>	dir = -1;
2782	>	else if (ph < h)
2783	>	dir = 1;
2784	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2785	>	return p;
2786	>	else if ((kc == null &&
2787	>	(kc = comparableClassFor(k)) == null) ||
2788	>	(dir = compareComparables(kc, k, pk)) == 0) {
2789	>	if (!searched) {
2790	>	TreeNode<K,V> q, ch;
2791	>	searched = true;
2792	>	if (((ch = p.left) != null &&
2793	>	(q = ch.findTreeNode(h, k, kc)) != null) ||
2794	>	((ch = p.right) != null &&
2795	>	(q = ch.findTreeNode(h, k, kc)) != null))
2796	>	return q;
2797	>	}
2798	>	dir = tieBreakOrder(k, pk);
2799	>	}
2800	>
2801	>	TreeNode<K,V> xp = p;
2802	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2803	>	TreeNode<K,V> x, f = first;
2804	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2805	>	if (f != null)
2806	>	f.prev = x;
2807	>	if (dir <= 0)
2808	>	xp.left = x;
2809	>	else
2810	>	xp.right = x;
2811	>	if (!xp.red)
2812	>	x.red = true;
2813	>	else {
2814	>	lockRoot();
2815	>	try {
2816	>	root = balanceInsertion(root, x);
2817	>	} finally {
2818	>	unlockRoot();
2819	>	}
2820	>	}
2821	>	break;
2822	>	}
2823	>	}
2824	>	assert checkInvariants(root);
2825	>	return null;
2826	>	}
2827	>
2828	>	/**
2829	>	* Removes the given node, that must be present before this
2830	>	* call.  This is messier than typical red-black deletion code
2831	>	* because we cannot swap the contents of an interior node
2832	>	* with a leaf successor that is pinned by "next" pointers
2833	>	* that are accessible independently of lock. So instead we
2834	>	* swap the tree linkages.
2835	>	*
2836	>	* @return true if now too small, so should be untreeified
2837	>	*/
2838	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2839	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2840	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2841	>	TreeNode<K,V> r, rl;
2842	>	if (pred == null)
2843	>	first = next;
2844	>	else
2845	>	pred.next = next;
2846	>	if (next != null)
2847	>	next.prev = pred;
2848	>	if (first == null) {
2849	>	root = null;
2850	>	return true;
2851	>	}
2852	>	if ((r = root) == null || r.right == null || // too small
2853	>	(rl = r.left) == null || rl.left == null)
2854	>	return true;
2855	>	lockRoot();
2856	>	try {
2857	>	TreeNode<K,V> replacement;
2858	>	TreeNode<K,V> pl = p.left;
2859	>	TreeNode<K,V> pr = p.right;
2860	>	if (pl != null && pr != null) {
2861	>	TreeNode<K,V> s = pr, sl;
2862	>	while ((sl = s.left) != null) // find successor
2863	>	s = sl;
2864	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2865	>	TreeNode<K,V> sr = s.right;
2866	>	TreeNode<K,V> pp = p.parent;
2867	>	if (s == pr) { // p was s's direct parent
2868	>	p.parent = s;
2869	>	s.right = p;
2870	>	}
2871	>	else {
2872	>	TreeNode<K,V> sp = s.parent;
2873	>	if ((p.parent = sp) != null) {
2874	>	if (s == sp.left)
2875	>	sp.left = p;
2876	>	else
2877	>	sp.right = p;
2878	>	}
2879	>	if ((s.right = pr) != null)
2880	>	pr.parent = s;
2881	>	}
2882	>	p.left = null;
2883	>	if ((p.right = sr) != null)
2884	>	sr.parent = p;
2885	>	if ((s.left = pl) != null)
2886	>	pl.parent = s;
2887	>	if ((s.parent = pp) == null)
2888	>	r = s;
2889	>	else if (p == pp.left)
2890	>	pp.left = s;
2891	>	else
2892	>	pp.right = s;
2893	>	if (sr != null)
2894	>	replacement = sr;
2895	>	else
2896	>	replacement = p;
2897	>	}
2898	>	else if (pl != null)
2899	>	replacement = pl;
2900	>	else if (pr != null)
2901	>	replacement = pr;
2902	>	else
2903	>	replacement = p;
2904	>	if (replacement != p) {
2905	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2906	>	if (pp == null)
2907	>	r = replacement;
2908	>	else if (p == pp.left)
2909	>	pp.left = replacement;
2910	>	else
2911	>	pp.right = replacement;
2912	>	p.left = p.right = p.parent = null;
2913	>	}
2914	>
2915	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2916	>
2917	>	if (p == replacement) {  // detach pointers
2918	>	TreeNode<K,V> pp;
2919	>	if ((pp = p.parent) != null) {
2920	>	if (p == pp.left)
2921	>	pp.left = null;
2922	>	else if (p == pp.right)
2923	>	pp.right = null;
2924	>	p.parent = null;
2925	>	}
2926	>	}
2927	>	} finally {
2928	>	unlockRoot();
2929	>	}
2930	>	assert checkInvariants(root);
2931	>	return false;
2932	>	}
2933	>
2934	>	/* ------------------------------------------------------------ */
2935	>	// Red-black tree methods, all adapted from CLR
2936	>
2937	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2938	>	TreeNode<K,V> p) {
2939	>	TreeNode<K,V> r, pp, rl;
2940	>	if (p != null && (r = p.right) != null) {
2941	>	if ((rl = p.right = r.left) != null)
2942	>	rl.parent = p;
2943	>	if ((pp = r.parent = p.parent) == null)
2944	>	(root = r).red = false;
2945	>	else if (pp.left == p)
2946	>	pp.left = r;
2947	>	else
2948	>	pp.right = r;
2949	>	r.left = p;
2950	>	p.parent = r;
2951	>	}
2952	>	return root;
2953	>	}
2954	>
2955	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2956	>	TreeNode<K,V> p) {
2957	>	TreeNode<K,V> l, pp, lr;
2958	>	if (p != null && (l = p.left) != null) {
2959	>	if ((lr = p.left = l.right) != null)
2960	>	lr.parent = p;
2961	>	if ((pp = l.parent = p.parent) == null)
2962	>	(root = l).red = false;
2963	>	else if (pp.right == p)
2964	>	pp.right = l;
2965	>	else
2966	>	pp.left = l;
2967	>	l.right = p;
2968	>	p.parent = l;
2969	>	}
2970	>	return root;
2971	>	}
2972	>
2973	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2974	>	TreeNode<K,V> x) {
2975	>	x.red = true;
2976	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2977	>	if ((xp = x.parent) == null) {
2978	>	x.red = false;
2979	>	return x;
2980	>	}
2981	>	else if (!xp.red || (xpp = xp.parent) == null)
2982	>	return root;
2983	>	if (xp == (xppl = xpp.left)) {
2984	>	if ((xppr = xpp.right) != null && xppr.red) {
2985	>	xppr.red = false;
2986	>	xp.red = false;
2987	>	xpp.red = true;
2988	>	x = xpp;
2989	>	}
2990	>	else {
2991	>	if (x == xp.right) {
2992	>	root = rotateLeft(root, x = xp);
2993	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2994	>	}
2995	>	if (xp != null) {
2996	>	xp.red = false;
2997	>	if (xpp != null) {
2998	>	xpp.red = true;
2999	>	root = rotateRight(root, xpp);
3000	>	}
3001	>	}
3002	>	}
3003	>	}
3004	>	else {
3005	>	if (xppl != null && xppl.red) {
3006	>	xppl.red = false;
3007	>	xp.red = false;
3008	>	xpp.red = true;
3009	>	x = xpp;
3010	>	}
3011	>	else {
3012	>	if (x == xp.left) {
3013	>	root = rotateRight(root, x = xp);
3014	>	xpp = (xp = x.parent) == null ? null : xp.parent;
3015	>	}
3016	>	if (xp != null) {
3017	>	xp.red = false;
3018	>	if (xpp != null) {
3019	>	xpp.red = true;
3020	>	root = rotateLeft(root, xpp);
3021	>	}
3022	>	}
3023	>	}
3024	>	}
3025	>	}
3026	>	}
3027	>
3028	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
3029	>	TreeNode<K,V> x) {
3030	>	for (TreeNode<K,V> xp, xpl, xpr;;) {
3031	>	if (x == null || x == root)
3032	>	return root;
3033	>	else if ((xp = x.parent) == null) {
3034	>	x.red = false;
3035	>	return x;
3036	>	}
3037	>	else if (x.red) {
3038	>	x.red = false;
3039	>	return root;
3040	>	}
3041	>	else if ((xpl = xp.left) == x) {
3042	>	if ((xpr = xp.right) != null && xpr.red) {
3043	>	xpr.red = false;
3044	>	xp.red = true;
3045	>	root = rotateLeft(root, xp);
3046	>	xpr = (xp = x.parent) == null ? null : xp.right;
3047	>	}
3048	>	if (xpr == null)
3049	>	x = xp;
3050	>	else {
3051	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
3052	>	if ((sr == null || !sr.red) &&
3053	>	(sl == null || !sl.red)) {
3054	>	xpr.red = true;
3055	>	x = xp;
3056	>	}
3057	>	else {
3058	>	if (sr == null || !sr.red) {
3059	>	if (sl != null)
3060	>	sl.red = false;
3061	>	xpr.red = true;
3062	>	root = rotateRight(root, xpr);
3063	>	xpr = (xp = x.parent) == null ?
3064	>	null : xp.right;
3065	>	}
3066	>	if (xpr != null) {
3067	>	xpr.red = (xp == null) ? false : xp.red;
3068	>	if ((sr = xpr.right) != null)
3069	>	sr.red = false;
3070	>	}
3071	>	if (xp != null) {
3072	>	xp.red = false;
3073	>	root = rotateLeft(root, xp);
3074	>	}
3075	>	x = root;
3076	>	}
3077	>	}
3078	>	}
3079	>	else { // symmetric
3080	>	if (xpl != null && xpl.red) {
3081	>	xpl.red = false;
3082	>	xp.red = true;
3083	>	root = rotateRight(root, xp);
3084	>	xpl = (xp = x.parent) == null ? null : xp.left;
3085	>	}
3086	>	if (xpl == null)
3087	>	x = xp;
3088	>	else {
3089	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3090	>	if ((sl == null || !sl.red) &&
3091	>	(sr == null || !sr.red)) {
3092	>	xpl.red = true;
3093	>	x = xp;
3094	>	}
3095	>	else {
3096	>	if (sl == null || !sl.red) {
3097	>	if (sr != null)
3098	>	sr.red = false;
3099	>	xpl.red = true;
3100	>	root = rotateLeft(root, xpl);
3101	>	xpl = (xp = x.parent) == null ?
3102	>	null : xp.left;
3103	>	}
3104	>	if (xpl != null) {
3105	>	xpl.red = (xp == null) ? false : xp.red;
3106	>	if ((sl = xpl.left) != null)
3107	>	sl.red = false;
3108	>	}
3109	>	if (xp != null) {
3110	>	xp.red = false;
3111	>	root = rotateRight(root, xp);
3112	>	}
3113	>	x = root;
3114	>	}
3115	>	}
3116	>	}
3117	>	}
3118	>	}
3119	>
3120	>	/**
3121	>	* Recursive invariant check
3122	>	*/
3123	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3124	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3125	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3126	>	if (tb != null && tb.next != t)
3127	>	return false;
3128	>	if (tn != null && tn.prev != t)
3129	>	return false;
3130	>	if (tp != null && t != tp.left && t != tp.right)
3131	>	return false;
3132	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3133	>	return false;
3134	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3135	>	return false;
3136	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3137	>	return false;
3138	>	if (tl != null && !checkInvariants(tl))
3139	>	return false;
3140	>	if (tr != null && !checkInvariants(tr))
3141	>	return false;
3142	>	return true;
3143	>	}
3144	>
3145	>	private static final sun.misc.Unsafe U;
3146	>	private static final long LOCKSTATE;
3147	>	static {
3148	>	try {
3149	>	U = getUnsafe();
3150	>	Class<?> k = TreeBin.class;
3151	>	LOCKSTATE = U.objectFieldOffset
3152	>	(k.getDeclaredField("lockState"));
3153	>	} catch (Exception e) {
3154	>	throw new Error(e);
3155		}
3156		}
3211	–	return sb.append('}').toString();
3157		}
3158
3159	+	/* ----------------Table Traversal -------------- */
3160	+
3161		/**
3162	<	* Compares the specified object with this map for equality.
3163	<	* Returns {@code true} if the given object is a map with the same
3164	<	* mappings as this map.  This operation may return misleading
3165	<	* results if either map is concurrently modified during execution
3166	<	* of this method.
3162	>	* Records the table, its length, and current traversal index for a
3163	>	* traverser that must process a region of a forwarded table before
3164	>	* proceeding with current table.
3165	>	*/
3166	>	static final class TableStack<K,V> {
3167	>	int length;
3168	>	int index;
3169	>	Node<K,V>[] tab;
3170	>	TableStack<K,V> next;
3171	>	}
3172	>
3173	>	/**
3174	>	* Encapsulates traversal for methods such as containsValue; also
3175	>	* serves as a base class for other iterators and spliterators.
3176		*
3177	<	* @param o object to be compared for equality with this map
3178	<	* @return {@code true} if the specified object is equal to this map
3177	>	* Method advance visits once each still-valid node that was
3178	>	* reachable upon iterator construction. It might miss some that
3179	>	* were added to a bin after the bin was visited, which is OK wrt
3180	>	* consistency guarantees. Maintaining this property in the face
3181	>	* of possible ongoing resizes requires a fair amount of
3182	>	* bookkeeping state that is difficult to optimize away amidst
3183	>	* volatile accesses.  Even so, traversal maintains reasonable
3184	>	* throughput.
3185	>	*
3186	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3187	>	* However, if the table has been resized, then all future steps
3188	>	* must traverse both the bin at the current index as well as at
3189	>	* (index + baseSize); and so on for further resizings. To
3190	>	* paranoically cope with potential sharing by users of iterators
3191	>	* across threads, iteration terminates if a bounds checks fails
3192	>	* for a table read.
3193		*/
3194	<	public boolean equals(Object o) {
3195	<	if (o != this) {
3196	<	if (!(o instanceof Map))
3197	<	return false;
3198	<	Map<?,?> m = (Map<?,?>) o;
3199	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3200	<	Object val;
3201	<	while ((val = it.advance()) != null) {
3202	<	Object v = m.get(it.nextKey);
3203	<	if (v == null || (v != val && !v.equals(val)))
3204	<	return false;
3205	<	}
3206	<	for (Map.Entry<?,?> e : m.entrySet()) {
3207	<	Object mk, mv, v;
3208	<	if ((mk = e.getKey()) == null ||
3209	<	(mv = e.getValue()) == null ||
3210	<	(v = internalGet(mk)) == null ||
3211	<	(mv != v && !mv.equals(v)))
3212	<	return false;
3194	>	static class Traverser<K,V> {
3195	>	Node<K,V>[] tab;        // current table; updated if resized
3196	>	Node<K,V> next;         // the next entry to use
3197	>	TableStack<K,V> stack, spare; // to save/restore on ForwardingNodes
3198	>	int index;              // index of bin to use next
3199	>	int baseIndex;          // current index of initial table
3200	>	int baseLimit;          // index bound for initial table
3201	>	final int baseSize;     // initial table size
3202	>
3203	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3204	>	this.tab = tab;
3205	>	this.baseSize = size;
3206	>	this.baseIndex = this.index = index;
3207	>	this.baseLimit = limit;
3208	>	this.next = null;
3209	>	}
3210	>
3211	>	/**
3212	>	* Advances if possible, returning next valid node, or null if none.
3213	>	*/
3214	>	final Node<K,V> advance() {
3215	>	Node<K,V> e;
3216	>	if ((e = next) != null)
3217	>	e = e.next;
3218	>	for (;;) {
3219	>	Node<K,V>[] t; int i, n;  // must use locals in checks
3220	>	if (e != null)
3221	>	return next = e;
3222	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3223	>	(n = t.length) <= (i = index) || i < 0)
3224	>	return next = null;
3225	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
3226	>	if (e instanceof ForwardingNode) {
3227	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3228	>	e = null;
3229	>	pushState(t, i, n);
3230	>	continue;
3231	>	}
3232	>	else if (e instanceof TreeBin)
3233	>	e = ((TreeBin<K,V>)e).first;
3234	>	else
3235	>	e = null;
3236	>	}
3237	>	if (stack != null)
3238	>	recoverState(n);
3239	>	else if ((index = i + baseSize) >= n)
3240	>	index = ++baseIndex; // visit upper slots if present
3241		}
3242		}
3245	–	return true;
3246	–	}
3243
3244	<	/* ----------------Iterators -------------- */
3244	>	/**
3245	>	* Saves traversal state upon encountering a forwarding node.
3246	>	*/
3247	>	private void pushState(Node<K,V>[] t, int i, int n) {
3248	>	TableStack<K,V> s = spare;  // reuse if possible
3249	>	if (s != null)
3250	>	spare = s.next;
3251	>	else
3252	>	s = new TableStack<K,V>();
3253	>	s.tab = t;
3254	>	s.length = n;
3255	>	s.index = i;
3256	>	s.next = stack;
3257	>	stack = s;
3258	>	}
3259
3260	<	@SuppressWarnings("serial") static final class KeyIterator<K,V> extends Traverser<K,V,Object>
3261	<	implements Spliterator<K>, Enumeration<K> {
3262	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3263	<	KeyIterator(Traverser<K,V,Object> it) {
3264	<	super(it);
3260	>	/**
3261	>	* Possibly pops traversal state.
3262	>	*
3263	>	* @param n length of current table
3264	>	*/
3265	>	private void recoverState(int n) {
3266	>	TableStack<K,V> s; int len;
3267	>	while ((s = stack) != null && (index += (len = s.length)) >= n) {
3268	>	n = len;
3269	>	index = s.index;
3270	>	tab = s.tab;
3271	>	s.tab = null;
3272	>	TableStack<K,V> next = s.next;
3273	>	s.next = spare; // save for reuse
3274	>	stack = next;
3275	>	spare = s;
3276	>	}
3277	>	if (s == null && (index += baseSize) >= n)
3278	>	index = ++baseIndex;
3279	>	}
3280	>	}
3281	>
3282	>	/**
3283	>	* Base of key, value, and entry Iterators. Adds fields to
3284	>	* Traverser to support iterator.remove.
3285	>	*/
3286	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3287	>	final ConcurrentHashMapV8<K,V> map;
3288	>	Node<K,V> lastReturned;
3289	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3290	>	ConcurrentHashMapV8<K,V> map) {
3291	>	super(tab, size, index, limit);
3292	>	this.map = map;
3293	>	advance();
3294		}
3295	<	public KeyIterator<K,V> split() {
3296	<	if (nextKey != null)
3295	>
3296	>	public final boolean hasNext() { return next != null; }
3297	>	public final boolean hasMoreElements() { return next != null; }
3298	>
3299	>	public final void remove() {
3300	>	Node<K,V> p;
3301	>	if ((p = lastReturned) == null)
3302		throw new IllegalStateException();
3303	<	return new KeyIterator<K,V>(this);
3303	>	lastReturned = null;
3304	>	map.replaceNode(p.key, null, null);
3305		}
3306	<	@SuppressWarnings("unchecked") public final K next() {
3307	<	if (nextVal == null && advance() == null)
3306	>	}
3307	>
3308	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3309	>	implements Iterator<K>, Enumeration<K> {
3310	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3311	>	ConcurrentHashMapV8<K,V> map) {
3312	>	super(tab, index, size, limit, map);
3313	>	}
3314	>
3315	>	public final K next() {
3316	>	Node<K,V> p;
3317	>	if ((p = next) == null)
3318		throw new NoSuchElementException();
3319	<	Object k = nextKey;
3320	<	nextVal = null;
3321	<	return (K) k;
3319	>	K k = p.key;
3320	>	lastReturned = p;
3321	>	advance();
3322	>	return k;
3323		}
3324
3325		public final K nextElement() { return next(); }
3326		}
3327
3328	<	@SuppressWarnings("serial") static final class ValueIterator<K,V> extends Traverser<K,V,Object>
3329	<	implements Spliterator<V>, Enumeration<V> {
3330	<	ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3331	<	ValueIterator(Traverser<K,V,Object> it) {
3332	<	super(it);
3277	<	}
3278	<	public ValueIterator<K,V> split() {
3279	<	if (nextKey != null)
3280	<	throw new IllegalStateException();
3281	<	return new ValueIterator<K,V>(this);
3328	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3329	>	implements Iterator<V>, Enumeration<V> {
3330	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3331	>	ConcurrentHashMapV8<K,V> map) {
3332	>	super(tab, index, size, limit, map);
3333		}
3334
3335	<	@SuppressWarnings("unchecked") public final V next() {
3336	<	Object v;
3337	<	if ((v = nextVal) == null && (v = advance()) == null)
3335	>	public final V next() {
3336	>	Node<K,V> p;
3337	>	if ((p = next) == null)
3338		throw new NoSuchElementException();
3339	<	nextVal = null;
3340	<	return (V) v;
3339	>	V v = p.val;
3340	>	lastReturned = p;
3341	>	advance();
3342	>	return v;
3343		}
3344
3345		public final V nextElement() { return next(); }
3346		}
3347
3348	<	@SuppressWarnings("serial") static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3349	<	implements Spliterator<Map.Entry<K,V>> {
3350	<	EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3351	<	EntryIterator(Traverser<K,V,Object> it) {
3352	<	super(it);
3300	<	}
3301	<	public EntryIterator<K,V> split() {
3302	<	if (nextKey != null)
3303	<	throw new IllegalStateException();
3304	<	return new EntryIterator<K,V>(this);
3348	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3349	>	implements Iterator<Map.Entry<K,V>> {
3350	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3351	>	ConcurrentHashMapV8<K,V> map) {
3352	>	super(tab, index, size, limit, map);
3353		}
3354
3355	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3356	<	Object v;
3357	<	if ((v = nextVal) == null && (v = advance()) == null)
3355	>	public final Map.Entry<K,V> next() {
3356	>	Node<K,V> p;
3357	>	if ((p = next) == null)
3358		throw new NoSuchElementException();
3359	<	Object k = nextKey;
3360	<	nextVal = null;
3361	<	return new MapEntry<K,V>((K)k, (V)v, map);
3359	>	K k = p.key;
3360	>	V v = p.val;
3361	>	lastReturned = p;
3362	>	advance();
3363	>	return new MapEntry<K,V>(k, v, map);
3364		}
3365		}
3366
3367		/**
3368	<	* Exported Entry for iterators
3368	>	* Exported Entry for EntryIterator
3369		*/
3370	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3370	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3371		final K key; // non-null
3372		V val;       // non-null
3373	<	final ConcurrentHashMapV8<K, V> map;
3374	<	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3373	>	final ConcurrentHashMapV8<K,V> map;
3374	>	MapEntry(K key, V val, ConcurrentHashMapV8<K,V> map) {
3375		this.key = key;
3376		this.val = val;
3377		this.map = map;
3378		}
3379	<	public final K getKey()       { return key; }
3380	<	public final V getValue()     { return val; }
3381	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3382	<	public final String toString(){ return key + "=" + val; }
3379	>	public K getKey()        { return key; }
3380	>	public V getValue()      { return val; }
3381	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3382	>	public String toString() { return key + "=" + val; }
3383
3384	<	public final boolean equals(Object o) {
3384	>	public boolean equals(Object o) {
3385		Object k, v; Map.Entry<?,?> e;
3386		return ((o instanceof Map.Entry) &&
3387		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3345 | Line 3395 | public class ConcurrentHashMapV8<K, V>
3395		* value to return is somewhat arbitrary here. Since we do not
3396		* necessarily track asynchronous changes, the most recent
3397		* "previous" value could be different from what we return (or
3398	<	* could even have been removed in which case the put will
3398	>	* could even have been removed, in which case the put will
3399		* re-establish). We do not and cannot guarantee more.
3400		*/
3401	<	public final V setValue(V value) {
3401	>	public V setValue(V value) {
3402		if (value == null) throw new NullPointerException();
3403		V v = val;
3404		val = value;
#	Line 3357 | Line 3407 | public class ConcurrentHashMapV8<K, V>
3407		}
3408		}
3409
3410	<	/* ----------------Views -------------- */
3410	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3411	>	implements ConcurrentHashMapSpliterator<K> {
3412	>	long est;               // size estimate
3413	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3414	>	long est) {
3415	>	super(tab, size, index, limit);
3416	>	this.est = est;
3417	>	}
3418	>
3419	>	public ConcurrentHashMapSpliterator<K> trySplit() {
3420	>	int i, f, h;
3421	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3422	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3423	>	f, est >>>= 1);
3424	>	}
3425
3426	<	/**
3427	<	* Base class for views.
3428	<	*/
3429	<	static abstract class CHMView<K, V> {
3430	<	final ConcurrentHashMapV8<K, V> map;
3367	<	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
3368	<	public final int size()                 { return map.size(); }
3369	<	public final boolean isEmpty()          { return map.isEmpty(); }
3370	<	public final void clear()               { map.clear(); }
3426	>	public void forEachRemaining(Action<? super K> action) {
3427	>	if (action == null) throw new NullPointerException();
3428	>	for (Node<K,V> p; (p = advance()) != null;)
3429	>	action.apply(p.key);
3430	>	}
3431
3432	<	// implementations below rely on concrete classes supplying these
3433	<	abstract public Iterator<?> iterator();
3434	<	abstract public boolean contains(Object o);
3435	<	abstract public boolean remove(Object o);
3432	>	public boolean tryAdvance(Action<? super K> action) {
3433	>	if (action == null) throw new NullPointerException();
3434	>	Node<K,V> p;
3435	>	if ((p = advance()) == null)
3436	>	return false;
3437	>	action.apply(p.key);
3438	>	return true;
3439	>	}
3440
3441	<	private static final String oomeMsg = "Required array size too large";
3441	>	public long estimateSize() { return est; }
3442
3443	<	public final Object[] toArray() {
3380	<	long sz = map.mappingCount();
3381	<	if (sz > (long)(MAX_ARRAY_SIZE))
3382	<	throw new OutOfMemoryError(oomeMsg);
3383	<	int n = (int)sz;
3384	<	Object[] r = new Object[n];
3385	<	int i = 0;
3386	<	Iterator<?> it = iterator();
3387	<	while (it.hasNext()) {
3388	<	if (i == n) {
3389	<	if (n >= MAX_ARRAY_SIZE)
3390	<	throw new OutOfMemoryError(oomeMsg);
3391	<	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
3392	<	n = MAX_ARRAY_SIZE;
3393	<	else
3394	<	n += (n >>> 1) + 1;
3395	<	r = Arrays.copyOf(r, n);
3396	<	}
3397	<	r[i++] = it.next();
3398	<	}
3399	<	return (i == n) ? r : Arrays.copyOf(r, i);
3400	<	}
3443	>	}
3444
3445	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
3446	<	long sz = map.mappingCount();
3447	<	if (sz > (long)(MAX_ARRAY_SIZE))
3448	<	throw new OutOfMemoryError(oomeMsg);
3449	<	int m = (int)sz;
3450	<	T[] r = (a.length >= m) ? a :
3451	<	(T[])java.lang.reflect.Array
3409	<	.newInstance(a.getClass().getComponentType(), m);
3410	<	int n = r.length;
3411	<	int i = 0;
3412	<	Iterator<?> it = iterator();
3413	<	while (it.hasNext()) {
3414	<	if (i == n) {
3415	<	if (n >= MAX_ARRAY_SIZE)
3416	<	throw new OutOfMemoryError(oomeMsg);
3417	<	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
3418	<	n = MAX_ARRAY_SIZE;
3419	<	else
3420	<	n += (n >>> 1) + 1;
3421	<	r = Arrays.copyOf(r, n);
3422	<	}
3423	<	r[i++] = (T)it.next();
3424	<	}
3425	<	if (a == r && i < n) {
3426	<	r[i] = null; // null-terminate
3427	<	return r;
3428	<	}
3429	<	return (i == n) ? r : Arrays.copyOf(r, i);
3445	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3446	>	implements ConcurrentHashMapSpliterator<V> {
3447	>	long est;               // size estimate
3448	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3449	>	long est) {
3450	>	super(tab, size, index, limit);
3451	>	this.est = est;
3452		}
3453
3454	<	public final int hashCode() {
3455	<	int h = 0;
3456	<	for (Iterator<?> it = iterator(); it.hasNext();)
3457	<	h += it.next().hashCode();
3458	<	return h;
3454	>	public ConcurrentHashMapSpliterator<V> trySplit() {
3455	>	int i, f, h;
3456	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3457	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3458	>	f, est >>>= 1);
3459		}
3460
3461	<	public final String toString() {
3462	<	StringBuilder sb = new StringBuilder();
3463	<	sb.append('[');
3464	<	Iterator<?> it = iterator();
3443	<	if (it.hasNext()) {
3444	<	for (;;) {
3445	<	Object e = it.next();
3446	<	sb.append(e == this ? "(this Collection)" : e);
3447	<	if (!it.hasNext())
3448	<	break;
3449	<	sb.append(',').append(' ');
3450	<	}
3451	<	}
3452	<	return sb.append(']').toString();
3461	>	public void forEachRemaining(Action<? super V> action) {
3462	>	if (action == null) throw new NullPointerException();
3463	>	for (Node<K,V> p; (p = advance()) != null;)
3464	>	action.apply(p.val);
3465		}
3466
3467	<	public final boolean containsAll(Collection<?> c) {
3468	<	if (c != this) {
3469	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
3470	<	Object e = it.next();
3471	<	if (e == null || !contains(e))
3472	<	return false;
3461	<	}
3462	<	}
3467	>	public boolean tryAdvance(Action<? super V> action) {
3468	>	if (action == null) throw new NullPointerException();
3469	>	Node<K,V> p;
3470	>	if ((p = advance()) == null)
3471	>	return false;
3472	>	action.apply(p.val);
3473		return true;
3474		}
3475
3476	<	public final boolean removeAll(Collection<?> c) {
3467	<	boolean modified = false;
3468	<	for (Iterator<?> it = iterator(); it.hasNext();) {
3469	<	if (c.contains(it.next())) {
3470	<	it.remove();
3471	<	modified = true;
3472	<	}
3473	<	}
3474	<	return modified;
3475	<	}
3476	<
3477	<	public final boolean retainAll(Collection<?> c) {
3478	<	boolean modified = false;
3479	<	for (Iterator<?> it = iterator(); it.hasNext();) {
3480	<	if (!c.contains(it.next())) {
3481	<	it.remove();
3482	<	modified = true;
3483	<	}
3484	<	}
3485	<	return modified;
3486	<	}
3476	>	public long estimateSize() { return est; }
3477
3478		}
3479
3480	<	static final class Values<K,V> extends CHMView<K,V>
3481	<	implements Collection<V> {
3482	<	Values(ConcurrentHashMapV8<K, V> map)   { super(map); }
3483	<	public final boolean contains(Object o) { return map.containsValue(o); }
3484	<	public final boolean remove(Object o) {
3485	<	if (o != null) {
3486	<	Iterator<V> it = new ValueIterator<K,V>(map);
3487	<	while (it.hasNext()) {
3488	<	if (o.equals(it.next())) {
3499	<	it.remove();
3500	<	return true;
3501	<	}
3502	<	}
3503	<	}
3504	<	return false;
3505	<	}
3506	<	public final Iterator<V> iterator() {
3507	<	return new ValueIterator<K,V>(map);
3508	<	}
3509	<	public final boolean add(V e) {
3510	<	throw new UnsupportedOperationException();
3511	<	}
3512	<	public final boolean addAll(Collection<? extends V> c) {
3513	<	throw new UnsupportedOperationException();
3480	>	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3481	>	implements ConcurrentHashMapSpliterator<Map.Entry<K,V>> {
3482	>	final ConcurrentHashMapV8<K,V> map; // To export MapEntry
3483	>	long est;               // size estimate
3484	>	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3485	>	long est, ConcurrentHashMapV8<K,V> map) {
3486	>	super(tab, size, index, limit);
3487	>	this.map = map;
3488	>	this.est = est;
3489		}
3490
3491	<	}
3492	<
3493	<	static final class EntrySet<K,V> extends CHMView<K,V>
3494	<	implements Set<Map.Entry<K,V>> {
3495	<	EntrySet(ConcurrentHashMapV8<K, V> map) { super(map); }
3521	<	public final boolean contains(Object o) {
3522	<	Object k, v, r; Map.Entry<?,?> e;
3523	<	return ((o instanceof Map.Entry) &&
3524	<	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
3525	<	(r = map.get(k)) != null &&
3526	<	(v = e.getValue()) != null &&
3527	<	(v == r || v.equals(r)));
3528	<	}
3529	<	public final boolean remove(Object o) {
3530	<	Object k, v; Map.Entry<?,?> e;
3531	<	return ((o instanceof Map.Entry) &&
3532	<	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
3533	<	(v = e.getValue()) != null &&
3534	<	map.remove(k, v));
3535	<	}
3536	<	public final Iterator<Map.Entry<K,V>> iterator() {
3537	<	return new EntryIterator<K,V>(map);
3491	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> trySplit() {
3492	>	int i, f, h;
3493	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3494	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3495	>	f, est >>>= 1, map);
3496		}
3497	<	public final boolean add(Entry<K,V> e) {
3498	<	throw new UnsupportedOperationException();
3499	<	}
3500	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
3501	<	throw new UnsupportedOperationException();
3497	>
3498	>	public void forEachRemaining(Action<? super Map.Entry<K,V>> action) {
3499	>	if (action == null) throw new NullPointerException();
3500	>	for (Node<K,V> p; (p = advance()) != null; )
3501	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3502		}
3503	<	public boolean equals(Object o) {
3504	<	Set<?> c;
3505	<	return ((o instanceof Set) &&
3506	<	((c = (Set<?>)o) == this ||
3507	<	(containsAll(c) && c.containsAll(this))));
3503	>
3504	>	public boolean tryAdvance(Action<? super Map.Entry<K,V>> action) {
3505	>	if (action == null) throw new NullPointerException();
3506	>	Node<K,V> p;
3507	>	if ((p = advance()) == null)
3508	>	return false;
3509	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3510	>	return true;
3511		}
3551	–	}
3512
3513	<	/* ---------------- Serialization Support -------------- */
3513	>	public long estimateSize() { return est; }
3514
3555	–	/**
3556	–	* Stripped-down version of helper class used in previous version,
3557	–	* declared for the sake of serialization compatibility
3558	–	*/
3559	–	static class Segment<K,V> implements Serializable {
3560	–	private static final long serialVersionUID = 2249069246763182397L;
3561	–	final float loadFactor;
3562	–	Segment(float lf) { this.loadFactor = lf; }
3515		}
3516
3517	<	/**
3566	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
3567	<	* stream (i.e., serializes it).
3568	<	* @param s the stream
3569	<	* @serialData
3570	<	* the key (Object) and value (Object)
3571	<	* for each key-value mapping, followed by a null pair.
3572	<	* The key-value mappings are emitted in no particular order.
3573	<	*/
3574	<	@SuppressWarnings("unchecked") private void writeObject(java.io.ObjectOutputStream s)
3575	<	throws java.io.IOException {
3576	<	if (segments == null) { // for serialization compatibility
3577	<	segments = (Segment<K,V>[])
3578	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
3579	<	for (int i = 0; i < segments.length; ++i)
3580	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
3581	<	}
3582	<	s.defaultWriteObject();
3583	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3584	<	Object v;
3585	<	while ((v = it.advance()) != null) {
3586	<	s.writeObject(it.nextKey);
3587	<	s.writeObject(v);
3588	<	}
3589	<	s.writeObject(null);
3590	<	s.writeObject(null);
3591	<	segments = null; // throw away
3592	<	}
3517	>	// Parallel bulk operations
3518
3519		/**
3520	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3521	<	* @param s the stream
3520	>	* Computes initial batch value for bulk tasks. The returned value
3521	>	* is approximately exp2 of the number of times (minus one) to
3522	>	* split task by two before executing leaf action. This value is
3523	>	* faster to compute and more convenient to use as a guide to
3524	>	* splitting than is the depth, since it is used while dividing by
3525	>	* two anyway.
3526		*/
3527	<	@SuppressWarnings("unchecked") private void readObject(java.io.ObjectInputStream s)
3528	<	throws java.io.IOException, ClassNotFoundException {
3529	<	s.defaultReadObject();
3530	<	this.segments = null; // unneeded
3531	<	// initialize transient final field
3532	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
3604	<
3605	<	// Create all nodes, then place in table once size is known
3606	<	long size = 0L;
3607	<	Node p = null;
3608	<	for (;;) {
3609	<	K k = (K) s.readObject();
3610	<	V v = (V) s.readObject();
3611	<	if (k != null && v != null) {
3612	<	int h = spread(k.hashCode());
3613	<	p = new Node(h, k, v, p);
3614	<	++size;
3615	<	}
3616	<	else
3617	<	break;
3618	<	}
3619	<	if (p != null) {
3620	<	boolean init = false;
3621	<	int n;
3622	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3623	<	n = MAXIMUM_CAPACITY;
3624	<	else {
3625	<	int sz = (int)size;
3626	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
3627	<	}
3628	<	int sc = sizeCtl;
3629	<	boolean collide = false;
3630	<	if (n > sc &&
3631	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
3632	<	try {
3633	<	if (table == null) {
3634	<	init = true;
3635	<	Node[] tab = new Node[n];
3636	<	int mask = n - 1;
3637	<	while (p != null) {
3638	<	int j = p.hash & mask;
3639	<	Node next = p.next;
3640	<	Node q = p.next = tabAt(tab, j);
3641	<	setTabAt(tab, j, p);
3642	<	if (!collide && q != null && q.hash == p.hash)
3643	<	collide = true;
3644	<	p = next;
3645	<	}
3646	<	table = tab;
3647	<	counter.add(size);
3648	<	sc = n - (n >>> 2);
3649	<	}
3650	<	} finally {
3651	<	sizeCtl = sc;
3652	<	}
3653	<	if (collide) { // rescan and convert to TreeBins
3654	<	Node[] tab = table;
3655	<	for (int i = 0; i < tab.length; ++i) {
3656	<	int c = 0;
3657	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
3658	<	if (++c > TREE_THRESHOLD &&
3659	<	(e.key instanceof Comparable)) {
3660	<	replaceWithTreeBin(tab, i, e.key);
3661	<	break;
3662	<	}
3663	<	}
3664	<	}
3665	<	}
3666	<	}
3667	<	if (!init) { // Can only happen if unsafely published.
3668	<	while (p != null) {
3669	<	internalPut(p.key, p.val);
3670	<	p = p.next;
3671	<	}
3672	<	}
3673	<	}
3527	>	final int batchFor(long b) {
3528	>	long n;
3529	>	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3530	>	return 0;
3531	>	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3532	>	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3533		}
3534
3676	–
3677	–	// -------------------------------------------------------
3678	–
3679	–	// Sams
3680	–	/** Interface describing a void action of one argument */
3681	–	public interface Action<A> { void apply(A a); }
3682	–	/** Interface describing a void action of two arguments */
3683	–	public interface BiAction<A,B> { void apply(A a, B b); }
3684	–	/** Interface describing a function of one argument */
3685	–	public interface Fun<A,T> { T apply(A a); }
3686	–	/** Interface describing a function of two arguments */
3687	–	public interface BiFun<A,B,T> { T apply(A a, B b); }
3688	–	/** Interface describing a function of no arguments */
3689	–	public interface Generator<T> { T apply(); }
3690	–	/** Interface describing a function mapping its argument to a double */
3691	–	public interface ObjectToDouble<A> { double apply(A a); }
3692	–	/** Interface describing a function mapping its argument to a long */
3693	–	public interface ObjectToLong<A> { long apply(A a); }
3694	–	/** Interface describing a function mapping its argument to an int */
3695	–	public interface ObjectToInt<A> {int apply(A a); }
3696	–	/** Interface describing a function mapping two arguments to a double */
3697	–	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
3698	–	/** Interface describing a function mapping two arguments to a long */
3699	–	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
3700	–	/** Interface describing a function mapping two arguments to an int */
3701	–	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
3702	–	/** Interface describing a function mapping a double to a double */
3703	–	public interface DoubleToDouble { double apply(double a); }
3704	–	/** Interface describing a function mapping a long to a long */
3705	–	public interface LongToLong { long apply(long a); }
3706	–	/** Interface describing a function mapping an int to an int */
3707	–	public interface IntToInt { int apply(int a); }
3708	–	/** Interface describing a function mapping two doubles to a double */
3709	–	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3710	–	/** Interface describing a function mapping two longs to a long */
3711	–	public interface LongByLongToLong { long apply(long a, long b); }
3712	–	/** Interface describing a function mapping two ints to an int */
3713	–	public interface IntByIntToInt { int apply(int a, int b); }
3714	–
3715	–
3716	–	// -------------------------------------------------------
3717	–
3535		/**
3536		* Performs the given action for each (key, value).
3537		*
3538	+	* @param parallelismThreshold the (estimated) number of elements
3539	+	* needed for this operation to be executed in parallel
3540		* @param action the action
3541	+	* @since 1.8
3542		*/
3543	<	public void forEach(BiAction<K,V> action) {
3544	<	ForkJoinTasks.forEach
3545	<	(this, action).invoke();
3543	>	public void forEach(long parallelismThreshold,
3544	>	BiAction<? super K,? super V> action) {
3545	>	if (action == null) throw new NullPointerException();
3546	>	new ForEachMappingTask<K,V>
3547	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3548	>	action).invoke();
3549		}
3550
3551		/**
3552		* Performs the given action for each non-null transformation
3553		* of each (key, value).
3554		*
3555	+	* @param parallelismThreshold the (estimated) number of elements
3556	+	* needed for this operation to be executed in parallel
3557		* @param transformer a function returning the transformation
3558	<	* for an element, or null of there is no transformation (in
3559	<	* which case the action is not applied).
3558	>	* for an element, or null if there is no transformation (in
3559	>	* which case the action is not applied)
3560		* @param action the action
3561	+	* @since 1.8
3562		*/
3563	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
3564	<	Action<U> action) {
3565	<	ForkJoinTasks.forEach
3566	<	(this, transformer, action).invoke();
3563	>	public <U> void forEach(long parallelismThreshold,
3564	>	BiFun<? super K, ? super V, ? extends U> transformer,
3565	>	Action<? super U> action) {
3566	>	if (transformer == null || action == null)
3567	>	throw new NullPointerException();
3568	>	new ForEachTransformedMappingTask<K,V,U>
3569	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3570	>	transformer, action).invoke();
3571		}
3572
3573		/**
#	Line 3747 | Line 3577 | public class ConcurrentHashMapV8<K, V>
3577		* results of any other parallel invocations of the search
3578		* function are ignored.
3579		*
3580	+	* @param parallelismThreshold the (estimated) number of elements
3581	+	* needed for this operation to be executed in parallel
3582		* @param searchFunction a function returning a non-null
3583		* result on success, else null
3584		* @return a non-null result from applying the given search
3585		* function on each (key, value), or null if none
3586	+	* @since 1.8
3587		*/
3588	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3589	<	return ForkJoinTasks.search
3590	<	(this, searchFunction).invoke();
3588	>	public <U> U search(long parallelismThreshold,
3589	>	BiFun<? super K, ? super V, ? extends U> searchFunction) {
3590	>	if (searchFunction == null) throw new NullPointerException();
3591	>	return new SearchMappingsTask<K,V,U>
3592	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3593	>	searchFunction, new AtomicReference<U>()).invoke();
3594		}
3595
3596		/**
#	Line 3762 | Line 3598 | public class ConcurrentHashMapV8<K, V>
3598		* of all (key, value) pairs using the given reducer to
3599		* combine values, or null if none.
3600		*
3601	+	* @param parallelismThreshold the (estimated) number of elements
3602	+	* needed for this operation to be executed in parallel
3603		* @param transformer a function returning the transformation
3604	<	* for an element, or null of there is no transformation (in
3605	<	* which case it is not combined).
3604	>	* for an element, or null if there is no transformation (in
3605	>	* which case it is not combined)
3606		* @param reducer a commutative associative combining function
3607		* @return the result of accumulating the given transformation
3608		* of all (key, value) pairs
3609	+	* @since 1.8
3610		*/
3611	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
3611	>	public <U> U reduce(long parallelismThreshold,
3612	>	BiFun<? super K, ? super V, ? extends U> transformer,
3613		BiFun<? super U, ? super U, ? extends U> reducer) {
3614	<	return ForkJoinTasks.reduce
3615	<	(this, transformer, reducer).invoke();
3614	>	if (transformer == null || reducer == null)
3615	>	throw new NullPointerException();
3616	>	return new MapReduceMappingsTask<K,V,U>
3617	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3618	>	null, transformer, reducer).invoke();
3619		}
3620
3621		/**
#	Line 3780 | Line 3623 | public class ConcurrentHashMapV8<K, V>
3623		* of all (key, value) pairs using the given reducer to
3624		* combine values, and the given basis as an identity value.
3625		*
3626	+	* @param parallelismThreshold the (estimated) number of elements
3627	+	* needed for this operation to be executed in parallel
3628		* @param transformer a function returning the transformation
3629		* for an element
3630		* @param basis the identity (initial default value) for the reduction
3631		* @param reducer a commutative associative combining function
3632		* @return the result of accumulating the given transformation
3633		* of all (key, value) pairs
3634	+	* @since 1.8
3635		*/
3636	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
3636	>	public double reduceToDouble(long parallelismThreshold,
3637	>	ObjectByObjectToDouble<? super K, ? super V> transformer,
3638		double basis,
3639		DoubleByDoubleToDouble reducer) {
3640	<	return ForkJoinTasks.reduceToDouble
3641	<	(this, transformer, basis, reducer).invoke();
3640	>	if (transformer == null || reducer == null)
3641	>	throw new NullPointerException();
3642	>	return new MapReduceMappingsToDoubleTask<K,V>
3643	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3644	>	null, transformer, basis, reducer).invoke();
3645		}
3646
3647		/**
#	Line 3799 | Line 3649 | public class ConcurrentHashMapV8<K, V>
3649		* of all (key, value) pairs using the given reducer to
3650		* combine values, and the given basis as an identity value.
3651		*
3652	+	* @param parallelismThreshold the (estimated) number of elements
3653	+	* needed for this operation to be executed in parallel
3654		* @param transformer a function returning the transformation
3655		* for an element
3656		* @param basis the identity (initial default value) for the reduction
3657		* @param reducer a commutative associative combining function
3658		* @return the result of accumulating the given transformation
3659		* of all (key, value) pairs
3660	+	* @since 1.8
3661		*/
3662	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
3662	>	public long reduceToLong(long parallelismThreshold,
3663	>	ObjectByObjectToLong<? super K, ? super V> transformer,
3664		long basis,
3665		LongByLongToLong reducer) {
3666	<	return ForkJoinTasks.reduceToLong
3667	<	(this, transformer, basis, reducer).invoke();
3666	>	if (transformer == null || reducer == null)
3667	>	throw new NullPointerException();
3668	>	return new MapReduceMappingsToLongTask<K,V>
3669	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3670	>	null, transformer, basis, reducer).invoke();
3671		}
3672
3673		/**
#	Line 3818 | Line 3675 | public class ConcurrentHashMapV8<K, V>
3675		* of all (key, value) pairs using the given reducer to
3676		* combine values, and the given basis as an identity value.
3677		*
3678	+	* @param parallelismThreshold the (estimated) number of elements
3679	+	* needed for this operation to be executed in parallel
3680		* @param transformer a function returning the transformation
3681		* for an element
3682		* @param basis the identity (initial default value) for the reduction
3683		* @param reducer a commutative associative combining function
3684		* @return the result of accumulating the given transformation
3685		* of all (key, value) pairs
3686	+	* @since 1.8
3687		*/
3688	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
3688	>	public int reduceToInt(long parallelismThreshold,
3689	>	ObjectByObjectToInt<? super K, ? super V> transformer,
3690		int basis,
3691		IntByIntToInt reducer) {
3692	<	return ForkJoinTasks.reduceToInt
3693	<	(this, transformer, basis, reducer).invoke();
3692	>	if (transformer == null || reducer == null)
3693	>	throw new NullPointerException();
3694	>	return new MapReduceMappingsToIntTask<K,V>
3695	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3696	>	null, transformer, basis, reducer).invoke();
3697		}
3698
3699		/**
3700		* Performs the given action for each key.
3701		*
3702	+	* @param parallelismThreshold the (estimated) number of elements
3703	+	* needed for this operation to be executed in parallel
3704		* @param action the action
3705	+	* @since 1.8
3706		*/
3707	<	public void forEachKey(Action<K> action) {
3708	<	ForkJoinTasks.forEachKey
3709	<	(this, action).invoke();
3707	>	public void forEachKey(long parallelismThreshold,
3708	>	Action<? super K> action) {
3709	>	if (action == null) throw new NullPointerException();
3710	>	new ForEachKeyTask<K,V>
3711	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3712	>	action).invoke();
3713		}
3714
3715		/**
3716		* Performs the given action for each non-null transformation
3717		* of each key.
3718		*
3719	+	* @param parallelismThreshold the (estimated) number of elements
3720	+	* needed for this operation to be executed in parallel
3721		* @param transformer a function returning the transformation
3722	<	* for an element, or null of there is no transformation (in
3723	<	* which case the action is not applied).
3722	>	* for an element, or null if there is no transformation (in
3723	>	* which case the action is not applied)
3724		* @param action the action
3725	+	* @since 1.8
3726		*/
3727	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
3728	<	Action<U> action) {
3729	<	ForkJoinTasks.forEachKey
3730	<	(this, transformer, action).invoke();
3727	>	public <U> void forEachKey(long parallelismThreshold,
3728	>	Fun<? super K, ? extends U> transformer,
3729	>	Action<? super U> action) {
3730	>	if (transformer == null || action == null)
3731	>	throw new NullPointerException();
3732	>	new ForEachTransformedKeyTask<K,V,U>
3733	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3734	>	transformer, action).invoke();
3735		}
3736
3737		/**
#	Line 3864 | Line 3741 | public class ConcurrentHashMapV8<K, V>
3741		* any other parallel invocations of the search function are
3742		* ignored.
3743		*
3744	+	* @param parallelismThreshold the (estimated) number of elements
3745	+	* needed for this operation to be executed in parallel
3746		* @param searchFunction a function returning a non-null
3747		* result on success, else null
3748		* @return a non-null result from applying the given search
3749		* function on each key, or null if none
3750	+	* @since 1.8
3751		*/
3752	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
3753	<	return ForkJoinTasks.searchKeys
3754	<	(this, searchFunction).invoke();
3752	>	public <U> U searchKeys(long parallelismThreshold,
3753	>	Fun<? super K, ? extends U> searchFunction) {
3754	>	if (searchFunction == null) throw new NullPointerException();
3755	>	return new SearchKeysTask<K,V,U>
3756	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3757	>	searchFunction, new AtomicReference<U>()).invoke();
3758		}
3759
3760		/**
3761		* Returns the result of accumulating all keys using the given
3762		* reducer to combine values, or null if none.
3763		*
3764	+	* @param parallelismThreshold the (estimated) number of elements
3765	+	* needed for this operation to be executed in parallel
3766		* @param reducer a commutative associative combining function
3767		* @return the result of accumulating all keys using the given
3768		* reducer to combine values, or null if none
3769	+	* @since 1.8
3770		*/
3771	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
3772	<	return ForkJoinTasks.reduceKeys
3773	<	(this, reducer).invoke();
3771	>	public K reduceKeys(long parallelismThreshold,
3772	>	BiFun<? super K, ? super K, ? extends K> reducer) {
3773	>	if (reducer == null) throw new NullPointerException();
3774	>	return new ReduceKeysTask<K,V>
3775	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3776	>	null, reducer).invoke();
3777		}
3778
3779		/**
#	Line 3892 | Line 3781 | public class ConcurrentHashMapV8<K, V>
3781		* of all keys using the given reducer to combine values, or
3782		* null if none.
3783		*
3784	+	* @param parallelismThreshold the (estimated) number of elements
3785	+	* needed for this operation to be executed in parallel
3786		* @param transformer a function returning the transformation
3787	<	* for an element, or null of there is no transformation (in
3788	<	* which case it is not combined).
3787	>	* for an element, or null if there is no transformation (in
3788	>	* which case it is not combined)
3789		* @param reducer a commutative associative combining function
3790		* @return the result of accumulating the given transformation
3791		* of all keys
3792	+	* @since 1.8
3793		*/
3794	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
3795	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3796	<	return ForkJoinTasks.reduceKeys
3797	<	(this, transformer, reducer).invoke();
3794	>	public <U> U reduceKeys(long parallelismThreshold,
3795	>	Fun<? super K, ? extends U> transformer,
3796	>	BiFun<? super U, ? super U, ? extends U> reducer) {
3797	>	if (transformer == null || reducer == null)
3798	>	throw new NullPointerException();
3799	>	return new MapReduceKeysTask<K,V,U>
3800	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3801	>	null, transformer, reducer).invoke();
3802		}
3803
3804		/**
#	Line 3910 | Line 3806 | public class ConcurrentHashMapV8<K, V>
3806		* of all keys using the given reducer to combine values, and
3807		* the given basis as an identity value.
3808		*
3809	+	* @param parallelismThreshold the (estimated) number of elements
3810	+	* needed for this operation to be executed in parallel
3811		* @param transformer a function returning the transformation
3812		* for an element
3813		* @param basis the identity (initial default value) for the reduction
3814		* @param reducer a commutative associative combining function
3815	<	* @return  the result of accumulating the given transformation
3815	>	* @return the result of accumulating the given transformation
3816		* of all keys
3817	+	* @since 1.8
3818		*/
3819	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
3819	>	public double reduceKeysToDouble(long parallelismThreshold,
3820	>	ObjectToDouble<? super K> transformer,
3821		double basis,
3822		DoubleByDoubleToDouble reducer) {
3823	<	return ForkJoinTasks.reduceKeysToDouble
3824	<	(this, transformer, basis, reducer).invoke();
3823	>	if (transformer == null || reducer == null)
3824	>	throw new NullPointerException();
3825	>	return new MapReduceKeysToDoubleTask<K,V>
3826	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3827	>	null, transformer, basis, reducer).invoke();
3828		}
3829
3830		/**
#	Line 3929 | Line 3832 | public class ConcurrentHashMapV8<K, V>
3832		* of all keys using the given reducer to combine values, and
3833		* the given basis as an identity value.
3834		*
3835	+	* @param parallelismThreshold the (estimated) number of elements
3836	+	* needed for this operation to be executed in parallel
3837		* @param transformer a function returning the transformation
3838		* for an element
3839		* @param basis the identity (initial default value) for the reduction
3840		* @param reducer a commutative associative combining function
3841		* @return the result of accumulating the given transformation
3842		* of all keys
3843	+	* @since 1.8
3844		*/
3845	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
3845	>	public long reduceKeysToLong(long parallelismThreshold,
3846	>	ObjectToLong<? super K> transformer,
3847		long basis,
3848		LongByLongToLong reducer) {
3849	<	return ForkJoinTasks.reduceKeysToLong
3850	<	(this, transformer, basis, reducer).invoke();
3849	>	if (transformer == null || reducer == null)
3850	>	throw new NullPointerException();
3851	>	return new MapReduceKeysToLongTask<K,V>
3852	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3853	>	null, transformer, basis, reducer).invoke();
3854		}
3855
3856		/**
#	Line 3948 | Line 3858 | public class ConcurrentHashMapV8<K, V>
3858		* of all keys using the given reducer to combine values, and
3859		* the given basis as an identity value.
3860		*
3861	+	* @param parallelismThreshold the (estimated) number of elements
3862	+	* needed for this operation to be executed in parallel
3863		* @param transformer a function returning the transformation
3864		* for an element
3865		* @param basis the identity (initial default value) for the reduction
3866		* @param reducer a commutative associative combining function
3867		* @return the result of accumulating the given transformation
3868		* of all keys
3869	+	* @since 1.8
3870		*/
3871	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3871	>	public int reduceKeysToInt(long parallelismThreshold,
3872	>	ObjectToInt<? super K> transformer,
3873		int basis,
3874		IntByIntToInt reducer) {
3875	<	return ForkJoinTasks.reduceKeysToInt
3876	<	(this, transformer, basis, reducer).invoke();
3875	>	if (transformer == null || reducer == null)
3876	>	throw new NullPointerException();
3877	>	return new MapReduceKeysToIntTask<K,V>
3878	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3879	>	null, transformer, basis, reducer).invoke();
3880		}
3881
3882		/**
3883		* Performs the given action for each value.
3884		*
3885	+	* @param parallelismThreshold the (estimated) number of elements
3886	+	* needed for this operation to be executed in parallel
3887		* @param action the action
3888	+	* @since 1.8
3889		*/
3890	<	public void forEachValue(Action<V> action) {
3891	<	ForkJoinTasks.forEachValue
3892	<	(this, action).invoke();
3890	>	public void forEachValue(long parallelismThreshold,
3891	>	Action<? super V> action) {
3892	>	if (action == null)
3893	>	throw new NullPointerException();
3894	>	new ForEachValueTask<K,V>
3895	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3896	>	action).invoke();
3897		}
3898
3899		/**
3900		* Performs the given action for each non-null transformation
3901		* of each value.
3902		*
3903	+	* @param parallelismThreshold the (estimated) number of elements
3904	+	* needed for this operation to be executed in parallel
3905		* @param transformer a function returning the transformation
3906	<	* for an element, or null of there is no transformation (in
3907	<	* which case the action is not applied).
3906	>	* for an element, or null if there is no transformation (in
3907	>	* which case the action is not applied)
3908	>	* @param action the action
3909	>	* @since 1.8
3910		*/
3911	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3912	<	Action<U> action) {
3913	<	ForkJoinTasks.forEachValue
3914	<	(this, transformer, action).invoke();
3911	>	public <U> void forEachValue(long parallelismThreshold,
3912	>	Fun<? super V, ? extends U> transformer,
3913	>	Action<? super U> action) {
3914	>	if (transformer == null || action == null)
3915	>	throw new NullPointerException();
3916	>	new ForEachTransformedValueTask<K,V,U>
3917	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3918	>	transformer, action).invoke();
3919		}
3920
3921		/**
#	Line 3993 | Line 3925 | public class ConcurrentHashMapV8<K, V>
3925		* any other parallel invocations of the search function are
3926		* ignored.
3927		*
3928	+	* @param parallelismThreshold the (estimated) number of elements
3929	+	* needed for this operation to be executed in parallel
3930		* @param searchFunction a function returning a non-null
3931		* result on success, else null
3932		* @return a non-null result from applying the given search
3933		* function on each value, or null if none
3934	<	*
3934	>	* @since 1.8
3935		*/
3936	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3937	<	return ForkJoinTasks.searchValues
3938	<	(this, searchFunction).invoke();
3936	>	public <U> U searchValues(long parallelismThreshold,
3937	>	Fun<? super V, ? extends U> searchFunction) {
3938	>	if (searchFunction == null) throw new NullPointerException();
3939	>	return new SearchValuesTask<K,V,U>
3940	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3941	>	searchFunction, new AtomicReference<U>()).invoke();
3942		}
3943
3944		/**
3945		* Returns the result of accumulating all values using the
3946		* given reducer to combine values, or null if none.
3947		*
3948	+	* @param parallelismThreshold the (estimated) number of elements
3949	+	* needed for this operation to be executed in parallel
3950		* @param reducer a commutative associative combining function
3951	<	* @return  the result of accumulating all values
3951	>	* @return the result of accumulating all values
3952	>	* @since 1.8
3953		*/
3954	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3955	<	return ForkJoinTasks.reduceValues
3956	<	(this, reducer).invoke();
3954	>	public V reduceValues(long parallelismThreshold,
3955	>	BiFun<? super V, ? super V, ? extends V> reducer) {
3956	>	if (reducer == null) throw new NullPointerException();
3957	>	return new ReduceValuesTask<K,V>
3958	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3959	>	null, reducer).invoke();
3960		}
3961
3962		/**
#	Line 4021 | Line 3964 | public class ConcurrentHashMapV8<K, V>
3964		* of all values using the given reducer to combine values, or
3965		* null if none.
3966		*
3967	+	* @param parallelismThreshold the (estimated) number of elements
3968	+	* needed for this operation to be executed in parallel
3969		* @param transformer a function returning the transformation
3970	<	* for an element, or null of there is no transformation (in
3971	<	* which case it is not combined).
3970	>	* for an element, or null if there is no transformation (in
3971	>	* which case it is not combined)
3972		* @param reducer a commutative associative combining function
3973		* @return the result of accumulating the given transformation
3974		* of all values
3975	+	* @since 1.8
3976		*/
3977	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3977	>	public <U> U reduceValues(long parallelismThreshold,
3978	>	Fun<? super V, ? extends U> transformer,
3979		BiFun<? super U, ? super U, ? extends U> reducer) {
3980	<	return ForkJoinTasks.reduceValues
3981	<	(this, transformer, reducer).invoke();
3980	>	if (transformer == null || reducer == null)
3981	>	throw new NullPointerException();
3982	>	return new MapReduceValuesTask<K,V,U>
3983	>	(null, batchFor(parallelismThreshold), 0, 0, table,
3984	>	null, transformer, reducer).invoke();
3985		}
3986
3987		/**
#	Line 4039 | Line 3989 | public class ConcurrentHashMapV8<K, V>
3989		* of all values using the given reducer to combine values,
3990		* and the given basis as an identity value.
3991		*
3992	+	* @param parallelismThreshold the (estimated) number of elements
3993	+	* needed for this operation to be executed in parallel
3994		* @param transformer a function returning the transformation
3995		* for an element
3996		* @param basis the identity (initial default value) for the reduction
3997		* @param reducer a commutative associative combining function
3998		* @return the result of accumulating the given transformation
3999		* of all values
4000	+	* @since 1.8
4001		*/
4002	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
4002	>	public double reduceValuesToDouble(long parallelismThreshold,
4003	>	ObjectToDouble<? super V> transformer,
4004		double basis,
4005		DoubleByDoubleToDouble reducer) {
4006	<	return ForkJoinTasks.reduceValuesToDouble
4007	<	(this, transformer, basis, reducer).invoke();
4006	>	if (transformer == null || reducer == null)
4007	>	throw new NullPointerException();
4008	>	return new MapReduceValuesToDoubleTask<K,V>
4009	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4010	>	null, transformer, basis, reducer).invoke();
4011		}
4012
4013		/**
#	Line 4058 | Line 4015 | public class ConcurrentHashMapV8<K, V>
4015		* of all values using the given reducer to combine values,
4016		* and the given basis as an identity value.
4017		*
4018	+	* @param parallelismThreshold the (estimated) number of elements
4019	+	* needed for this operation to be executed in parallel
4020		* @param transformer a function returning the transformation
4021		* for an element
4022		* @param basis the identity (initial default value) for the reduction
4023		* @param reducer a commutative associative combining function
4024		* @return the result of accumulating the given transformation
4025		* of all values
4026	+	* @since 1.8
4027		*/
4028	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
4028	>	public long reduceValuesToLong(long parallelismThreshold,
4029	>	ObjectToLong<? super V> transformer,
4030		long basis,
4031		LongByLongToLong reducer) {
4032	<	return ForkJoinTasks.reduceValuesToLong
4033	<	(this, transformer, basis, reducer).invoke();
4032	>	if (transformer == null || reducer == null)
4033	>	throw new NullPointerException();
4034	>	return new MapReduceValuesToLongTask<K,V>
4035	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4036	>	null, transformer, basis, reducer).invoke();
4037		}
4038
4039		/**
#	Line 4077 | Line 4041 | public class ConcurrentHashMapV8<K, V>
4041		* of all values using the given reducer to combine values,
4042		* and the given basis as an identity value.
4043		*
4044	+	* @param parallelismThreshold the (estimated) number of elements
4045	+	* needed for this operation to be executed in parallel
4046		* @param transformer a function returning the transformation
4047		* for an element
4048		* @param basis the identity (initial default value) for the reduction
4049		* @param reducer a commutative associative combining function
4050		* @return the result of accumulating the given transformation
4051		* of all values
4052	+	* @since 1.8
4053		*/
4054	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
4054	>	public int reduceValuesToInt(long parallelismThreshold,
4055	>	ObjectToInt<? super V> transformer,
4056		int basis,
4057		IntByIntToInt reducer) {
4058	<	return ForkJoinTasks.reduceValuesToInt
4059	<	(this, transformer, basis, reducer).invoke();
4058	>	if (transformer == null || reducer == null)
4059	>	throw new NullPointerException();
4060	>	return new MapReduceValuesToIntTask<K,V>
4061	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4062	>	null, transformer, basis, reducer).invoke();
4063		}
4064
4065		/**
4066		* Performs the given action for each entry.
4067		*
4068	+	* @param parallelismThreshold the (estimated) number of elements
4069	+	* needed for this operation to be executed in parallel
4070		* @param action the action
4071	+	* @since 1.8
4072		*/
4073	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
4074	<	ForkJoinTasks.forEachEntry
4075	<	(this, action).invoke();
4073	>	public void forEachEntry(long parallelismThreshold,
4074	>	Action<? super Map.Entry<K,V>> action) {
4075	>	if (action == null) throw new NullPointerException();
4076	>	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
4077	>	action).invoke();
4078		}
4079
4080		/**
4081		* Performs the given action for each non-null transformation
4082		* of each entry.
4083		*
4084	+	* @param parallelismThreshold the (estimated) number of elements
4085	+	* needed for this operation to be executed in parallel
4086		* @param transformer a function returning the transformation
4087	<	* for an element, or null of there is no transformation (in
4088	<	* which case the action is not applied).
4087	>	* for an element, or null if there is no transformation (in
4088	>	* which case the action is not applied)
4089		* @param action the action
4090	+	* @since 1.8
4091		*/
4092	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
4093	<	Action<U> action) {
4094	<	ForkJoinTasks.forEachEntry
4095	<	(this, transformer, action).invoke();
4092	>	public <U> void forEachEntry(long parallelismThreshold,
4093	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4094	>	Action<? super U> action) {
4095	>	if (transformer == null || action == null)
4096	>	throw new NullPointerException();
4097	>	new ForEachTransformedEntryTask<K,V,U>
4098	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4099	>	transformer, action).invoke();
4100		}
4101
4102		/**
#	Line 4123 | Line 4106 | public class ConcurrentHashMapV8<K, V>
4106		* any other parallel invocations of the search function are
4107		* ignored.
4108		*
4109	+	* @param parallelismThreshold the (estimated) number of elements
4110	+	* needed for this operation to be executed in parallel
4111		* @param searchFunction a function returning a non-null
4112		* result on success, else null
4113		* @return a non-null result from applying the given search
4114		* function on each entry, or null if none
4115	+	* @since 1.8
4116		*/
4117	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4118	<	return ForkJoinTasks.searchEntries
4119	<	(this, searchFunction).invoke();
4117	>	public <U> U searchEntries(long parallelismThreshold,
4118	>	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4119	>	if (searchFunction == null) throw new NullPointerException();
4120	>	return new SearchEntriesTask<K,V,U>
4121	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4122	>	searchFunction, new AtomicReference<U>()).invoke();
4123		}
4124
4125		/**
4126		* Returns the result of accumulating all entries using the
4127		* given reducer to combine values, or null if none.
4128		*
4129	+	* @param parallelismThreshold the (estimated) number of elements
4130	+	* needed for this operation to be executed in parallel
4131		* @param reducer a commutative associative combining function
4132		* @return the result of accumulating all entries
4133	+	* @since 1.8
4134		*/
4135	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4136	<	return ForkJoinTasks.reduceEntries
4137	<	(this, reducer).invoke();
4135	>	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4136	>	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4137	>	if (reducer == null) throw new NullPointerException();
4138	>	return new ReduceEntriesTask<K,V>
4139	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4140	>	null, reducer).invoke();
4141		}
4142
4143		/**
#	Line 4150 | Line 4145 | public class ConcurrentHashMapV8<K, V>
4145		* of all entries using the given reducer to combine values,
4146		* or null if none.
4147		*
4148	+	* @param parallelismThreshold the (estimated) number of elements
4149	+	* needed for this operation to be executed in parallel
4150		* @param transformer a function returning the transformation
4151	<	* for an element, or null of there is no transformation (in
4152	<	* which case it is not combined).
4151	>	* for an element, or null if there is no transformation (in
4152	>	* which case it is not combined)
4153		* @param reducer a commutative associative combining function
4154		* @return the result of accumulating the given transformation
4155		* of all entries
4156	+	* @since 1.8
4157		*/
4158	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4158	>	public <U> U reduceEntries(long parallelismThreshold,
4159	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
4160		BiFun<? super U, ? super U, ? extends U> reducer) {
4161	<	return ForkJoinTasks.reduceEntries
4162	<	(this, transformer, reducer).invoke();
4161	>	if (transformer == null || reducer == null)
4162	>	throw new NullPointerException();
4163	>	return new MapReduceEntriesTask<K,V,U>
4164	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4165	>	null, transformer, reducer).invoke();
4166		}
4167
4168		/**
#	Line 4168 | Line 4170 | public class ConcurrentHashMapV8<K, V>
4170		* of all entries using the given reducer to combine values,
4171		* and the given basis as an identity value.
4172		*
4173	+	* @param parallelismThreshold the (estimated) number of elements
4174	+	* needed for this operation to be executed in parallel
4175		* @param transformer a function returning the transformation
4176		* for an element
4177		* @param basis the identity (initial default value) for the reduction
4178		* @param reducer a commutative associative combining function
4179		* @return the result of accumulating the given transformation
4180		* of all entries
4181	+	* @since 1.8
4182		*/
4183	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4183	>	public double reduceEntriesToDouble(long parallelismThreshold,
4184	>	ObjectToDouble<Map.Entry<K,V>> transformer,
4185		double basis,
4186		DoubleByDoubleToDouble reducer) {
4187	<	return ForkJoinTasks.reduceEntriesToDouble
4188	<	(this, transformer, basis, reducer).invoke();
4187	>	if (transformer == null || reducer == null)
4188	>	throw new NullPointerException();
4189	>	return new MapReduceEntriesToDoubleTask<K,V>
4190	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4191	>	null, transformer, basis, reducer).invoke();
4192		}
4193
4194		/**
#	Line 4187 | Line 4196 | public class ConcurrentHashMapV8<K, V>
4196		* of all entries using the given reducer to combine values,
4197		* and the given basis as an identity value.
4198		*
4199	+	* @param parallelismThreshold the (estimated) number of elements
4200	+	* needed for this operation to be executed in parallel
4201		* @param transformer a function returning the transformation
4202		* for an element
4203		* @param basis the identity (initial default value) for the reduction
4204		* @param reducer a commutative associative combining function
4205	<	* @return  the result of accumulating the given transformation
4205	>	* @return the result of accumulating the given transformation
4206		* of all entries
4207	+	* @since 1.8
4208		*/
4209	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4209	>	public long reduceEntriesToLong(long parallelismThreshold,
4210	>	ObjectToLong<Map.Entry<K,V>> transformer,
4211		long basis,
4212		LongByLongToLong reducer) {
4213	<	return ForkJoinTasks.reduceEntriesToLong
4214	<	(this, transformer, basis, reducer).invoke();
4213	>	if (transformer == null || reducer == null)
4214	>	throw new NullPointerException();
4215	>	return new MapReduceEntriesToLongTask<K,V>
4216	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4217	>	null, transformer, basis, reducer).invoke();
4218		}
4219
4220		/**
#	Line 4206 | Line 4222 | public class ConcurrentHashMapV8<K, V>
4222		* of all entries using the given reducer to combine values,
4223		* and the given basis as an identity value.
4224		*
4225	+	* @param parallelismThreshold the (estimated) number of elements
4226	+	* needed for this operation to be executed in parallel
4227		* @param transformer a function returning the transformation
4228		* for an element
4229		* @param basis the identity (initial default value) for the reduction
4230		* @param reducer a commutative associative combining function
4231		* @return the result of accumulating the given transformation
4232		* of all entries
4233	+	* @since 1.8
4234		*/
4235	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
4235	>	public int reduceEntriesToInt(long parallelismThreshold,
4236	>	ObjectToInt<Map.Entry<K,V>> transformer,
4237		int basis,
4238		IntByIntToInt reducer) {
4239	<	return ForkJoinTasks.reduceEntriesToInt
4240	<	(this, transformer, basis, reducer).invoke();
4239	>	if (transformer == null || reducer == null)
4240	>	throw new NullPointerException();
4241	>	return new MapReduceEntriesToIntTask<K,V>
4242	>	(null, batchFor(parallelismThreshold), 0, 0, table,
4243	>	null, transformer, basis, reducer).invoke();
4244		}
4245
4246	<	// ---------------------------------------------------------------------
4246	>
4247	>	/* ----------------Views -------------- */
4248
4249		/**
4250	<	* Predefined tasks for performing bulk parallel operations on
4227	<	* ConcurrentHashMapV8s. These tasks follow the forms and rules used
4228	<	* for bulk operations. Each method has the same name, but returns
4229	<	* a task rather than invoking it. These methods may be useful in
4230	<	* custom applications such as submitting a task without waiting
4231	<	* for completion, using a custom pool, or combining with other
4232	<	* tasks.
4250	>	* Base class for views.
4251		*/
4252	<	public static class ForkJoinTasks {
4253	<	private ForkJoinTasks() {}
4254	<
4255	<	/**
4256	<	* Returns a task that when invoked, performs the given
4239	<	* action for each (key, value)
4240	<	*
4241	<	* @param map the map
4242	<	* @param action the action
4243	<	* @return the task
4244	<	*/
4245	<	public static <K,V> ForkJoinTask<Void> forEach
4246	<	(ConcurrentHashMapV8<K,V> map,
4247	<	BiAction<K,V> action) {
4248	<	if (action == null) throw new NullPointerException();
4249	<	return new ForEachMappingTask<K,V>(map, null, -1, null, action);
4250	<	}
4252	>	abstract static class CollectionView<K,V,E>
4253	>	implements Collection<E>, java.io.Serializable {
4254	>	private static final long serialVersionUID = 7249069246763182397L;
4255	>	final ConcurrentHashMapV8<K,V> map;
4256	>	CollectionView(ConcurrentHashMapV8<K,V> map)  { this.map = map; }
4257
4258		/**
4259	<	* Returns a task that when invoked, performs the given
4254	<	* action for each non-null transformation of each (key, value)
4259	>	* Returns the map backing this view.
4260		*
4261	<	* @param map the map
4257	<	* @param transformer a function returning the transformation
4258	<	* for an element, or null if there is no transformation (in
4259	<	* which case the action is not applied)
4260	<	* @param action the action
4261	<	* @return the task
4261	>	* @return the map backing this view
4262		*/
4263	<	public static <K,V,U> ForkJoinTask<Void> forEach
4264	<	(ConcurrentHashMapV8<K,V> map,
4265	<	BiFun<? super K, ? super V, ? extends U> transformer,
4266	<	Action<U> action) {
4267	<	if (transformer == null || action == null)
4268	<	throw new NullPointerException();
4269	<	return new ForEachTransformedMappingTask<K,V,U>
4270	<	(map, null, -1, null, transformer, action);
4271	<	}
4263	>	public ConcurrentHashMapV8<K,V> getMap() { return map; }
4264
4265		/**
4266	<	* Returns a task that when invoked, returns a non-null result
4267	<	* from applying the given search function on each (key,
4276	<	* value), or null if none. Upon success, further element
4277	<	* processing is suppressed and the results of any other
4278	<	* parallel invocations of the search function are ignored.
4279	<	*
4280	<	* @param map the map
4281	<	* @param searchFunction a function returning a non-null
4282	<	* result on success, else null
4283	<	* @return the task
4266	>	* Removes all of the elements from this view, by removing all
4267	>	* the mappings from the map backing this view.
4268		*/
4269	<	public static <K,V,U> ForkJoinTask<U> search
4270	<	(ConcurrentHashMapV8<K,V> map,
4271	<	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4288	<	if (searchFunction == null) throw new NullPointerException();
4289	<	return new SearchMappingsTask<K,V,U>
4290	<	(map, null, -1, null, searchFunction,
4291	<	new AtomicReference<U>());
4292	<	}
4269	>	public final void clear()      { map.clear(); }
4270	>	public final int size()        { return map.size(); }
4271	>	public final boolean isEmpty() { return map.isEmpty(); }
4272
4273	+	// implementations below rely on concrete classes supplying these
4274	+	// abstract methods
4275		/**
4276	<	* Returns a task that when invoked, returns the result of
4277	<	* accumulating the given transformation of all (key, value) pairs
4278	<	* using the given reducer to combine values, or null if none.
4279	<	*
4280	<	* @param map the map
4281	<	* @param transformer a function returning the transformation
4282	<	* for an element, or null if there is no transformation (in
4283	<	* which case it is not combined).
4284	<	* @param reducer a commutative associative combining function
4285	<	* @return the task
4305	<	*/
4306	<	public static <K,V,U> ForkJoinTask<U> reduce
4307	<	(ConcurrentHashMapV8<K,V> map,
4308	<	BiFun<? super K, ? super V, ? extends U> transformer,
4309	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4310	<	if (transformer == null || reducer == null)
4311	<	throw new NullPointerException();
4312	<	return new MapReduceMappingsTask<K,V,U>
4313	<	(map, null, -1, null, transformer, reducer);
4314	<	}
4276	>	* Returns a "weakly consistent" iterator that will never
4277	>	* throw {@link ConcurrentModificationException}, and
4278	>	* guarantees to traverse elements as they existed upon
4279	>	* construction of the iterator, and may (but is not
4280	>	* guaranteed to) reflect any modifications subsequent to
4281	>	* construction.
4282	>	*/
4283	>	public abstract Iterator<E> iterator();
4284	>	public abstract boolean contains(Object o);
4285	>	public abstract boolean remove(Object o);
4286
4287	<	/**
4317	<	* Returns a task that when invoked, returns the result of
4318	<	* accumulating the given transformation of all (key, value) pairs
4319	<	* using the given reducer to combine values, and the given
4320	<	* basis as an identity value.
4321	<	*
4322	<	* @param map the map
4323	<	* @param transformer a function returning the transformation
4324	<	* for an element
4325	<	* @param basis the identity (initial default value) for the reduction
4326	<	* @param reducer a commutative associative combining function
4327	<	* @return the task
4328	<	*/
4329	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4330	<	(ConcurrentHashMapV8<K,V> map,
4331	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
4332	<	double basis,
4333	<	DoubleByDoubleToDouble reducer) {
4334	<	if (transformer == null || reducer == null)
4335	<	throw new NullPointerException();
4336	<	return new MapReduceMappingsToDoubleTask<K,V>
4337	<	(map, null, -1, null, transformer, basis, reducer);
4338	<	}
4339	<
4340	<	/**
4341	<	* Returns a task that when invoked, returns the result of
4342	<	* accumulating the given transformation of all (key, value) pairs
4343	<	* using the given reducer to combine values, and the given
4344	<	* basis as an identity value.
4345	<	*
4346	<	* @param map the map
4347	<	* @param transformer a function returning the transformation
4348	<	* for an element
4349	<	* @param basis the identity (initial default value) for the reduction
4350	<	* @param reducer a commutative associative combining function
4351	<	* @return the task
4352	<	*/
4353	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4354	<	(ConcurrentHashMapV8<K,V> map,
4355	<	ObjectByObjectToLong<? super K, ? super V> transformer,
4356	<	long basis,
4357	<	LongByLongToLong reducer) {
4358	<	if (transformer == null || reducer == null)
4359	<	throw new NullPointerException();
4360	<	return new MapReduceMappingsToLongTask<K,V>
4361	<	(map, null, -1, null, transformer, basis, reducer);
4362	<	}
4287	>	private static final String oomeMsg = "Required array size too large";
4288
4289	<	/**
4290	<	* Returns a task that when invoked, returns the result of
4291	<	* accumulating the given transformation of all (key, value) pairs
4292	<	* using the given reducer to combine values, and the given
4293	<	* basis as an identity value.
4294	<	*
4295	<	* @param transformer a function returning the transformation
4296	<	* for an element
4297	<	* @param basis the identity (initial default value) for the reduction
4298	<	* @param reducer a commutative associative combining function
4299	<	* @return the task
4300	<	*/
4301	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4302	<	(ConcurrentHashMapV8<K,V> map,
4303	<	ObjectByObjectToInt<? super K, ? super V> transformer,
4304	<	int basis,
4305	<	IntByIntToInt reducer) {
4306	<	if (transformer == null || reducer == null)
4307	<	throw new NullPointerException();
4308	<	return new MapReduceMappingsToIntTask<K,V>
4384	<	(map, null, -1, null, transformer, basis, reducer);
4289	>	public final Object[] toArray() {
4290	>	long sz = map.mappingCount();
4291	>	if (sz > MAX_ARRAY_SIZE)
4292	>	throw new OutOfMemoryError(oomeMsg);
4293	>	int n = (int)sz;
4294	>	Object[] r = new Object[n];
4295	>	int i = 0;
4296	>	for (E e : this) {
4297	>	if (i == n) {
4298	>	if (n >= MAX_ARRAY_SIZE)
4299	>	throw new OutOfMemoryError(oomeMsg);
4300	>	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
4301	>	n = MAX_ARRAY_SIZE;
4302	>	else
4303	>	n += (n >>> 1) + 1;
4304	>	r = Arrays.copyOf(r, n);
4305	>	}
4306	>	r[i++] = e;
4307	>	}
4308	>	return (i == n) ? r : Arrays.copyOf(r, i);
4309		}
4310
4311	<	/**
4312	<	* Returns a task that when invoked, performs the given action
4313	<	* for each key.
4314	<	*
4315	<	* @param map the map
4316	<	* @param action the action
4317	<	* @return the task
4318	<	*/
4319	<	public static <K,V> ForkJoinTask<Void> forEachKey
4320	<	(ConcurrentHashMapV8<K,V> map,
4321	<	Action<K> action) {
4322	<	if (action == null) throw new NullPointerException();
4323	<	return new ForEachKeyTask<K,V>(map, null, -1, null, action);
4311	>	@SuppressWarnings("unchecked")
4312	>	public final <T> T[] toArray(T[] a) {
4313	>	long sz = map.mappingCount();
4314	>	if (sz > MAX_ARRAY_SIZE)
4315	>	throw new OutOfMemoryError(oomeMsg);
4316	>	int m = (int)sz;
4317	>	T[] r = (a.length >= m) ? a :
4318	>	(T[])java.lang.reflect.Array
4319	>	.newInstance(a.getClass().getComponentType(), m);
4320	>	int n = r.length;
4321	>	int i = 0;
4322	>	for (E e : this) {
4323	>	if (i == n) {
4324	>	if (n >= MAX_ARRAY_SIZE)
4325	>	throw new OutOfMemoryError(oomeMsg);
4326	>	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
4327	>	n = MAX_ARRAY_SIZE;
4328	>	else
4329	>	n += (n >>> 1) + 1;
4330	>	r = Arrays.copyOf(r, n);
4331	>	}
4332	>	r[i++] = (T)e;
4333	>	}
4334	>	if (a == r && i < n) {
4335	>	r[i] = null; // null-terminate
4336	>	return r;
4337	>	}
4338	>	return (i == n) ? r : Arrays.copyOf(r, i);
4339		}
4340
4341		/**
4342	<	* Returns a task that when invoked, performs the given action
4343	<	* for each non-null transformation of each key.
4342	>	* Returns a string representation of this collection.
4343	>	* The string representation consists of the string representations
4344	>	* of the collection's elements in the order they are returned by
4345	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4346	>	* Adjacent elements are separated by the characters {@code ", "}
4347	>	* (comma and space).  Elements are converted to strings as by
4348	>	* {@link String#valueOf(Object)}.
4349		*
4350	<	* @param map the map
4407	<	* @param transformer a function returning the transformation
4408	<	* for an element, or null if there is no transformation (in
4409	<	* which case the action is not applied)
4410	<	* @param action the action
4411	<	* @return the task
4350	>	* @return a string representation of this collection
4351		*/
4352	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4353	<	(ConcurrentHashMapV8<K,V> map,
4354	<	Fun<? super K, ? extends U> transformer,
4355	<	Action<U> action) {
4356	<	if (transformer == null || action == null)
4357	<	throw new NullPointerException();
4358	<	return new ForEachTransformedKeyTask<K,V,U>
4359	<	(map, null, -1, null, transformer, action);
4352	>	public final String toString() {
4353	>	StringBuilder sb = new StringBuilder();
4354	>	sb.append('[');
4355	>	Iterator<E> it = iterator();
4356	>	if (it.hasNext()) {
4357	>	for (;;) {
4358	>	Object e = it.next();
4359	>	sb.append(e == this ? "(this Collection)" : e);
4360	>	if (!it.hasNext())
4361	>	break;
4362	>	sb.append(',').append(' ');
4363	>	}
4364	>	}
4365	>	return sb.append(']').toString();
4366		}
4367
4368	<	/**
4369	<	* Returns a task that when invoked, returns a non-null result
4370	<	* from applying the given search function on each key, or
4371	<	* null if none.  Upon success, further element processing is
4372	<	* suppressed and the results of any other parallel
4373	<	* invocations of the search function are ignored.
4374	<	*
4375	<	* @param map the map
4431	<	* @param searchFunction a function returning a non-null
4432	<	* result on success, else null
4433	<	* @return the task
4434	<	*/
4435	<	public static <K,V,U> ForkJoinTask<U> searchKeys
4436	<	(ConcurrentHashMapV8<K,V> map,
4437	<	Fun<? super K, ? extends U> searchFunction) {
4438	<	if (searchFunction == null) throw new NullPointerException();
4439	<	return new SearchKeysTask<K,V,U>
4440	<	(map, null, -1, null, searchFunction,
4441	<	new AtomicReference<U>());
4368	>	public final boolean containsAll(Collection<?> c) {
4369	>	if (c != this) {
4370	>	for (Object e : c) {
4371	>	if (e == null || !contains(e))
4372	>	return false;
4373	>	}
4374	>	}
4375	>	return true;
4376		}
4377
4378	<	/**
4379	<	* Returns a task that when invoked, returns the result of
4380	<	* accumulating all keys using the given reducer to combine
4381	<	* values, or null if none.
4382	<	*
4383	<	* @param map the map
4384	<	* @param reducer a commutative associative combining function
4385	<	* @return the task
4386	<	*/
4453	<	public static <K,V> ForkJoinTask<K> reduceKeys
4454	<	(ConcurrentHashMapV8<K,V> map,
4455	<	BiFun<? super K, ? super K, ? extends K> reducer) {
4456	<	if (reducer == null) throw new NullPointerException();
4457	<	return new ReduceKeysTask<K,V>
4458	<	(map, null, -1, null, reducer);
4378	>	public final boolean removeAll(Collection<?> c) {
4379	>	boolean modified = false;
4380	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4381	>	if (c.contains(it.next())) {
4382	>	it.remove();
4383	>	modified = true;
4384	>	}
4385	>	}
4386	>	return modified;
4387		}
4388
4389	<	/**
4390	<	* Returns a task that when invoked, returns the result of
4391	<	* accumulating the given transformation of all keys using the given
4392	<	* reducer to combine values, or null if none.
4393	<	*
4394	<	* @param map the map
4395	<	* @param transformer a function returning the transformation
4396	<	* for an element, or null if there is no transformation (in
4397	<	* which case it is not combined).
4470	<	* @param reducer a commutative associative combining function
4471	<	* @return the task
4472	<	*/
4473	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
4474	<	(ConcurrentHashMapV8<K,V> map,
4475	<	Fun<? super K, ? extends U> transformer,
4476	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4477	<	if (transformer == null || reducer == null)
4478	<	throw new NullPointerException();
4479	<	return new MapReduceKeysTask<K,V,U>
4480	<	(map, null, -1, null, transformer, reducer);
4389	>	public final boolean retainAll(Collection<?> c) {
4390	>	boolean modified = false;
4391	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4392	>	if (!c.contains(it.next())) {
4393	>	it.remove();
4394	>	modified = true;
4395	>	}
4396	>	}
4397	>	return modified;
4398		}
4399
4400	<	/**
4484	<	* Returns a task that when invoked, returns the result of
4485	<	* accumulating the given transformation of all keys using the given
4486	<	* reducer to combine values, and the given basis as an
4487	<	* identity value.
4488	<	*
4489	<	* @param map the map
4490	<	* @param transformer a function returning the transformation
4491	<	* for an element
4492	<	* @param basis the identity (initial default value) for the reduction
4493	<	* @param reducer a commutative associative combining function
4494	<	* @return the task
4495	<	*/
4496	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4497	<	(ConcurrentHashMapV8<K,V> map,
4498	<	ObjectToDouble<? super K> transformer,
4499	<	double basis,
4500	<	DoubleByDoubleToDouble reducer) {
4501	<	if (transformer == null || reducer == null)
4502	<	throw new NullPointerException();
4503	<	return new MapReduceKeysToDoubleTask<K,V>
4504	<	(map, null, -1, null, transformer, basis, reducer);
4505	<	}
4400	>	}
4401
4402	<	/**
4403	<	* Returns a task that when invoked, returns the result of
4404	<	* accumulating the given transformation of all keys using the given
4405	<	* reducer to combine values, and the given basis as an
4406	<	* identity value.
4407	<	*
4408	<	* @param map the map
4409	<	* @param transformer a function returning the transformation
4410	<	* for an element
4411	<	* @param basis the identity (initial default value) for the reduction
4412	<	* @param reducer a commutative associative combining function
4413	<	* @return the task
4414	<	*/
4415	<	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
4416	<	(ConcurrentHashMapV8<K,V> map,
4417	<	ObjectToLong<? super K> transformer,
4418	<	long basis,
4419	<	LongByLongToLong reducer) {
4525	<	if (transformer == null || reducer == null)
4526	<	throw new NullPointerException();
4527	<	return new MapReduceKeysToLongTask<K,V>
4528	<	(map, null, -1, null, transformer, basis, reducer);
4402	>	/**
4403	>	* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4404	>	* which additions may optionally be enabled by mapping to a
4405	>	* common value.  This class cannot be directly instantiated.
4406	>	* See {@link #keySet() keySet()},
4407	>	* {@link #keySet(Object) keySet(V)},
4408	>	* {@link #newKeySet() newKeySet()},
4409	>	* {@link #newKeySet(int) newKeySet(int)}.
4410	>	*
4411	>	* @since 1.8
4412	>	*/
4413	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4414	>	implements Set<K>, java.io.Serializable {
4415	>	private static final long serialVersionUID = 7249069246763182397L;
4416	>	private final V value;
4417	>	KeySetView(ConcurrentHashMapV8<K,V> map, V value) {  // non-public
4418	>	super(map);
4419	>	this.value = value;
4420		}
4421
4422		/**
4423	<	* Returns a task that when invoked, returns the result of
4424	<	* accumulating the given transformation of all keys using the given
4534	<	* reducer to combine values, and the given basis as an
4535	<	* identity value.
4423	>	* Returns the default mapped value for additions,
4424	>	* or {@code null} if additions are not supported.
4425		*
4426	<	* @param map the map
4427	<	* @param transformer a function returning the transformation
4539	<	* for an element
4540	<	* @param basis the identity (initial default value) for the reduction
4541	<	* @param reducer a commutative associative combining function
4542	<	* @return the task
4426	>	* @return the default mapped value for additions, or {@code null}
4427	>	* if not supported
4428		*/
4429	<	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
4545	<	(ConcurrentHashMapV8<K,V> map,
4546	<	ObjectToInt<? super K> transformer,
4547	<	int basis,
4548	<	IntByIntToInt reducer) {
4549	<	if (transformer == null || reducer == null)
4550	<	throw new NullPointerException();
4551	<	return new MapReduceKeysToIntTask<K,V>
4552	<	(map, null, -1, null, transformer, basis, reducer);
4553	<	}
4429	>	public V getMappedValue() { return value; }
4430
4431		/**
4432	<	* Returns a task that when invoked, performs the given action
4433	<	* for each value.
4558	<	*
4559	<	* @param map the map
4560	<	* @param action the action
4432	>	* {@inheritDoc}
4433	>	* @throws NullPointerException if the specified key is null
4434		*/
4435	<	public static <K,V> ForkJoinTask<Void> forEachValue
4563	<	(ConcurrentHashMapV8<K,V> map,
4564	<	Action<V> action) {
4565	<	if (action == null) throw new NullPointerException();
4566	<	return new ForEachValueTask<K,V>(map, null, -1, null, action);
4567	<	}
4435	>	public boolean contains(Object o) { return map.containsKey(o); }
4436
4437		/**
4438	<	* Returns a task that when invoked, performs the given action
4439	<	* for each non-null transformation of each value.
4438	>	* Removes the key from this map view, by removing the key (and its
4439	>	* corresponding value) from the backing map.  This method does
4440	>	* nothing if the key is not in the map.
4441		*
4442	<	* @param map the map
4443	<	* @param transformer a function returning the transformation
4444	<	* for an element, or null if there is no transformation (in
4576	<	* which case the action is not applied)
4577	<	* @param action the action
4442	>	* @param  o the key to be removed from the backing map
4443	>	* @return {@code true} if the backing map contained the specified key
4444	>	* @throws NullPointerException if the specified key is null
4445		*/
4446	<	public static <K,V,U> ForkJoinTask<Void> forEachValue
4580	<	(ConcurrentHashMapV8<K,V> map,
4581	<	Fun<? super V, ? extends U> transformer,
4582	<	Action<U> action) {
4583	<	if (transformer == null || action == null)
4584	<	throw new NullPointerException();
4585	<	return new ForEachTransformedValueTask<K,V,U>
4586	<	(map, null, -1, null, transformer, action);
4587	<	}
4446	>	public boolean remove(Object o) { return map.remove(o) != null; }
4447
4448		/**
4449	<	* Returns a task that when invoked, returns a non-null result
4591	<	* from applying the given search function on each value, or
4592	<	* null if none.  Upon success, further element processing is
4593	<	* suppressed and the results of any other parallel
4594	<	* invocations of the search function are ignored.
4595	<	*
4596	<	* @param map the map
4597	<	* @param searchFunction a function returning a non-null
4598	<	* result on success, else null
4599	<	* @return the task
4449	>	* @return an iterator over the keys of the backing map
4450		*/
4451	<	public static <K,V,U> ForkJoinTask<U> searchValues
4452	<	(ConcurrentHashMapV8<K,V> map,
4453	<	Fun<? super V, ? extends U> searchFunction) {
4454	<	if (searchFunction == null) throw new NullPointerException();
4455	<	return new SearchValuesTask<K,V,U>
4606	<	(map, null, -1, null, searchFunction,
4607	<	new AtomicReference<U>());
4451	>	public Iterator<K> iterator() {
4452	>	Node<K,V>[] t;
4453	>	ConcurrentHashMapV8<K,V> m = map;
4454	>	int f = (t = m.table) == null ? 0 : t.length;
4455	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4456		}
4457
4458		/**
4459	<	* Returns a task that when invoked, returns the result of
4460	<	* accumulating all values using the given reducer to combine
4613	<	* values, or null if none.
4459	>	* Adds the specified key to this set view by mapping the key to
4460	>	* the default mapped value in the backing map, if defined.
4461		*
4462	<	* @param map the map
4463	<	* @param reducer a commutative associative combining function
4464	<	* @return the task
4462	>	* @param e key to be added
4463	>	* @return {@code true} if this set changed as a result of the call
4464	>	* @throws NullPointerException if the specified key is null
4465	>	* @throws UnsupportedOperationException if no default mapped value
4466	>	* for additions was provided
4467		*/
4468	<	public static <K,V> ForkJoinTask<V> reduceValues
4469	<	(ConcurrentHashMapV8<K,V> map,
4470	<	BiFun<? super V, ? super V, ? extends V> reducer) {
4471	<	if (reducer == null) throw new NullPointerException();
4472	<	return new ReduceValuesTask<K,V>
4624	<	(map, null, -1, null, reducer);
4468	>	public boolean add(K e) {
4469	>	V v;
4470	>	if ((v = value) == null)
4471	>	throw new UnsupportedOperationException();
4472	>	return map.putVal(e, v, true) == null;
4473		}
4474
4475		/**
4476	<	* Returns a task that when invoked, returns the result of
4477	<	* accumulating the given transformation of all values using the
4630	<	* given reducer to combine values, or null if none.
4476	>	* Adds all of the elements in the specified collection to this set,
4477	>	* as if by calling {@link #add} on each one.
4478		*
4479	<	* @param map the map
4480	<	* @param transformer a function returning the transformation
4481	<	* for an element, or null if there is no transformation (in
4482	<	* which case it is not combined).
4483	<	* @param reducer a commutative associative combining function
4484	<	* @return the task
4479	>	* @param c the elements to be inserted into this set
4480	>	* @return {@code true} if this set changed as a result of the call
4481	>	* @throws NullPointerException if the collection or any of its
4482	>	* elements are {@code null}
4483	>	* @throws UnsupportedOperationException if no default mapped value
4484	>	* for additions was provided
4485		*/
4486	<	public static <K,V,U> ForkJoinTask<U> reduceValues
4487	<	(ConcurrentHashMapV8<K,V> map,
4488	<	Fun<? super V, ? extends U> transformer,
4489	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4490	<	if (transformer == null || reducer == null)
4491	<	throw new NullPointerException();
4492	<	return new MapReduceValuesTask<K,V,U>
4493	<	(map, null, -1, null, transformer, reducer);
4486	>	public boolean addAll(Collection<? extends K> c) {
4487	>	boolean added = false;
4488	>	V v;
4489	>	if ((v = value) == null)
4490	>	throw new UnsupportedOperationException();
4491	>	for (K e : c) {
4492	>	if (map.putVal(e, v, true) == null)
4493	>	added = true;
4494	>	}
4495	>	return added;
4496		}
4497
4498	<	/**
4499	<	* Returns a task that when invoked, returns the result of
4500	<	* accumulating the given transformation of all values using the
4501	<	* given reducer to combine values, and the given basis as an
4502	<	* identity value.
4654	<	*
4655	<	* @param map the map
4656	<	* @param transformer a function returning the transformation
4657	<	* for an element
4658	<	* @param basis the identity (initial default value) for the reduction
4659	<	* @param reducer a commutative associative combining function
4660	<	* @return the task
4661	<	*/
4662	<	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
4663	<	(ConcurrentHashMapV8<K,V> map,
4664	<	ObjectToDouble<? super V> transformer,
4665	<	double basis,
4666	<	DoubleByDoubleToDouble reducer) {
4667	<	if (transformer == null || reducer == null)
4668	<	throw new NullPointerException();
4669	<	return new MapReduceValuesToDoubleTask<K,V>
4670	<	(map, null, -1, null, transformer, basis, reducer);
4498	>	public int hashCode() {
4499	>	int h = 0;
4500	>	for (K e : this)
4501	>	h += e.hashCode();
4502	>	return h;
4503		}
4504
4505	<	/**
4506	<	* Returns a task that when invoked, returns the result of
4507	<	* accumulating the given transformation of all values using the
4508	<	* given reducer to combine values, and the given basis as an
4509	<	* identity value.
4678	<	*
4679	<	* @param map the map
4680	<	* @param transformer a function returning the transformation
4681	<	* for an element
4682	<	* @param basis the identity (initial default value) for the reduction
4683	<	* @param reducer a commutative associative combining function
4684	<	* @return the task
4685	<	*/
4686	<	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
4687	<	(ConcurrentHashMapV8<K,V> map,
4688	<	ObjectToLong<? super V> transformer,
4689	<	long basis,
4690	<	LongByLongToLong reducer) {
4691	<	if (transformer == null || reducer == null)
4692	<	throw new NullPointerException();
4693	<	return new MapReduceValuesToLongTask<K,V>
4694	<	(map, null, -1, null, transformer, basis, reducer);
4505	>	public boolean equals(Object o) {
4506	>	Set<?> c;
4507	>	return ((o instanceof Set) &&
4508	>	((c = (Set<?>)o) == this ||
4509	>	(containsAll(c) && c.containsAll(this))));
4510		}
4511
4512	<	/**
4513	<	* Returns a task that when invoked, returns the result of
4514	<	* accumulating the given transformation of all values using the
4515	<	* given reducer to combine values, and the given basis as an
4516	<	* identity value.
4517	<	*
4703	<	* @param map the map
4704	<	* @param transformer a function returning the transformation
4705	<	* for an element
4706	<	* @param basis the identity (initial default value) for the reduction
4707	<	* @param reducer a commutative associative combining function
4708	<	* @return the task
4709	<	*/
4710	<	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
4711	<	(ConcurrentHashMapV8<K,V> map,
4712	<	ObjectToInt<? super V> transformer,
4713	<	int basis,
4714	<	IntByIntToInt reducer) {
4715	<	if (transformer == null || reducer == null)
4716	<	throw new NullPointerException();
4717	<	return new MapReduceValuesToIntTask<K,V>
4718	<	(map, null, -1, null, transformer, basis, reducer);
4512	>	public ConcurrentHashMapSpliterator<K> spliterator() {
4513	>	Node<K,V>[] t;
4514	>	ConcurrentHashMapV8<K,V> m = map;
4515	>	long n = m.sumCount();
4516	>	int f = (t = m.table) == null ? 0 : t.length;
4517	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4518		}
4519
4520	<	/**
4722	<	* Returns a task that when invoked, perform the given action
4723	<	* for each entry.
4724	<	*
4725	<	* @param map the map
4726	<	* @param action the action
4727	<	*/
4728	<	public static <K,V> ForkJoinTask<Void> forEachEntry
4729	<	(ConcurrentHashMapV8<K,V> map,
4730	<	Action<Map.Entry<K,V>> action) {
4520	>	public void forEach(Action<? super K> action) {
4521		if (action == null) throw new NullPointerException();
4522	<	return new ForEachEntryTask<K,V>(map, null, -1, null, action);
4522	>	Node<K,V>[] t;
4523	>	if ((t = map.table) != null) {
4524	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4525	>	for (Node<K,V> p; (p = it.advance()) != null; )
4526	>	action.apply(p.key);
4527	>	}
4528		}
4529	+	}
4530
4531	<	/**
4532	<	* Returns a task that when invoked, perform the given action
4533	<	* for each non-null transformation of each entry.
4534	<	*
4535	<	* @param map the map
4536	<	* @param transformer a function returning the transformation
4537	<	* for an element, or null if there is no transformation (in
4538	<	* which case the action is not applied)
4539	<	* @param action the action
4540	<	*/
4541	<	public static <K,V,U> ForkJoinTask<Void> forEachEntry
4746	<	(ConcurrentHashMapV8<K,V> map,
4747	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4748	<	Action<U> action) {
4749	<	if (transformer == null || action == null)
4750	<	throw new NullPointerException();
4751	<	return new ForEachTransformedEntryTask<K,V,U>
4752	<	(map, null, -1, null, transformer, action);
4531	>	/**
4532	>	* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4533	>	* values, in which additions are disabled. This class cannot be
4534	>	* directly instantiated. See {@link #values()}.
4535	>	*/
4536	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4537	>	implements Collection<V>, java.io.Serializable {
4538	>	private static final long serialVersionUID = 2249069246763182397L;
4539	>	ValuesView(ConcurrentHashMapV8<K,V> map) { super(map); }
4540	>	public final boolean contains(Object o) {
4541	>	return map.containsValue(o);
4542		}
4543
4544	<	/**
4545	<	* Returns a task that when invoked, returns a non-null result
4546	<	* from applying the given search function on each entry, or
4547	<	* null if none.  Upon success, further element processing is
4548	<	* suppressed and the results of any other parallel
4549	<	* invocations of the search function are ignored.
4550	<	*
4551	<	* @param map the map
4552	<	* @param searchFunction a function returning a non-null
4553	<	* result on success, else null
4765	<	* @return the task
4766	<	*/
4767	<	public static <K,V,U> ForkJoinTask<U> searchEntries
4768	<	(ConcurrentHashMapV8<K,V> map,
4769	<	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4770	<	if (searchFunction == null) throw new NullPointerException();
4771	<	return new SearchEntriesTask<K,V,U>
4772	<	(map, null, -1, null, searchFunction,
4773	<	new AtomicReference<U>());
4544	>	public final boolean remove(Object o) {
4545	>	if (o != null) {
4546	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4547	>	if (o.equals(it.next())) {
4548	>	it.remove();
4549	>	return true;
4550	>	}
4551	>	}
4552	>	}
4553	>	return false;
4554		}
4555
4556	<	/**
4557	<	* Returns a task that when invoked, returns the result of
4558	<	* accumulating all entries using the given reducer to combine
4559	<	* values, or null if none.
4560	<	*
4781	<	* @param map the map
4782	<	* @param reducer a commutative associative combining function
4783	<	* @return the task
4784	<	*/
4785	<	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
4786	<	(ConcurrentHashMapV8<K,V> map,
4787	<	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4788	<	if (reducer == null) throw new NullPointerException();
4789	<	return new ReduceEntriesTask<K,V>
4790	<	(map, null, -1, null, reducer);
4556	>	public final Iterator<V> iterator() {
4557	>	ConcurrentHashMapV8<K,V> m = map;
4558	>	Node<K,V>[] t;
4559	>	int f = (t = m.table) == null ? 0 : t.length;
4560	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4561		}
4562
4563	<	/**
4564	<	* Returns a task that when invoked, returns the result of
4795	<	* accumulating the given transformation of all entries using the
4796	<	* given reducer to combine values, or null if none.
4797	<	*
4798	<	* @param map the map
4799	<	* @param transformer a function returning the transformation
4800	<	* for an element, or null if there is no transformation (in
4801	<	* which case it is not combined).
4802	<	* @param reducer a commutative associative combining function
4803	<	* @return the task
4804	<	*/
4805	<	public static <K,V,U> ForkJoinTask<U> reduceEntries
4806	<	(ConcurrentHashMapV8<K,V> map,
4807	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4808	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4809	<	if (transformer == null || reducer == null)
4810	<	throw new NullPointerException();
4811	<	return new MapReduceEntriesTask<K,V,U>
4812	<	(map, null, -1, null, transformer, reducer);
4563	>	public final boolean add(V e) {
4564	>	throw new UnsupportedOperationException();
4565		}
4566	<
4567	<	/**
4816	<	* Returns a task that when invoked, returns the result of
4817	<	* accumulating the given transformation of all entries using the
4818	<	* given reducer to combine values, and the given basis as an
4819	<	* identity value.
4820	<	*
4821	<	* @param map the map
4822	<	* @param transformer a function returning the transformation
4823	<	* for an element
4824	<	* @param basis the identity (initial default value) for the reduction
4825	<	* @param reducer a commutative associative combining function
4826	<	* @return the task
4827	<	*/
4828	<	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
4829	<	(ConcurrentHashMapV8<K,V> map,
4830	<	ObjectToDouble<Map.Entry<K,V>> transformer,
4831	<	double basis,
4832	<	DoubleByDoubleToDouble reducer) {
4833	<	if (transformer == null || reducer == null)
4834	<	throw new NullPointerException();
4835	<	return new MapReduceEntriesToDoubleTask<K,V>
4836	<	(map, null, -1, null, transformer, basis, reducer);
4566	>	public final boolean addAll(Collection<? extends V> c) {
4567	>	throw new UnsupportedOperationException();
4568		}
4569
4570	<	/**
4571	<	* Returns a task that when invoked, returns the result of
4572	<	* accumulating the given transformation of all entries using the
4573	<	* given reducer to combine values, and the given basis as an
4574	<	* identity value.
4575	<	*
4845	<	* @param map the map
4846	<	* @param transformer a function returning the transformation
4847	<	* for an element
4848	<	* @param basis the identity (initial default value) for the reduction
4849	<	* @param reducer a commutative associative combining function
4850	<	* @return the task
4851	<	*/
4852	<	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
4853	<	(ConcurrentHashMapV8<K,V> map,
4854	<	ObjectToLong<Map.Entry<K,V>> transformer,
4855	<	long basis,
4856	<	LongByLongToLong reducer) {
4857	<	if (transformer == null || reducer == null)
4858	<	throw new NullPointerException();
4859	<	return new MapReduceEntriesToLongTask<K,V>
4860	<	(map, null, -1, null, transformer, basis, reducer);
4570	>	public ConcurrentHashMapSpliterator<V> spliterator() {
4571	>	Node<K,V>[] t;
4572	>	ConcurrentHashMapV8<K,V> m = map;
4573	>	long n = m.sumCount();
4574	>	int f = (t = m.table) == null ? 0 : t.length;
4575	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4576		}
4577
4578	<	/**
4579	<	* Returns a task that when invoked, returns the result of
4580	<	* accumulating the given transformation of all entries using the
4581	<	* given reducer to combine values, and the given basis as an
4582	<	* identity value.
4583	<	*
4584	<	* @param map the map
4585	<	* @param transformer a function returning the transformation
4871	<	* for an element
4872	<	* @param basis the identity (initial default value) for the reduction
4873	<	* @param reducer a commutative associative combining function
4874	<	* @return the task
4875	<	*/
4876	<	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
4877	<	(ConcurrentHashMapV8<K,V> map,
4878	<	ObjectToInt<Map.Entry<K,V>> transformer,
4879	<	int basis,
4880	<	IntByIntToInt reducer) {
4881	<	if (transformer == null || reducer == null)
4882	<	throw new NullPointerException();
4883	<	return new MapReduceEntriesToIntTask<K,V>
4884	<	(map, null, -1, null, transformer, basis, reducer);
4578	>	public void forEach(Action<? super V> action) {
4579	>	if (action == null) throw new NullPointerException();
4580	>	Node<K,V>[] t;
4581	>	if ((t = map.table) != null) {
4582	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4583	>	for (Node<K,V> p; (p = it.advance()) != null; )
4584	>	action.apply(p.val);
4585	>	}
4586		}
4587		}
4588
4888	–	// -------------------------------------------------------
4889	–
4589		/**
4590	<	* Base for FJ tasks for bulk operations. This adds a variant of
4591	<	* CountedCompleters and some split and merge bookkeeping to
4592	<	* iterator functionality. The forEach and reduce methods are
4593	<	* similar to those illustrated in CountedCompleter documentation,
4594	<	* except that bottom-up reduction completions perform them within
4595	<	* their compute methods. The search methods are like forEach
4596	<	* except they continually poll for success and exit early.  Also,
4597	<	* exceptions are handled in a simpler manner, by just trying to
4899	<	* complete root task exceptionally.
4900	<	*/
4901	<	@SuppressWarnings("serial") static abstract class BulkTask<K,V,R> extends Traverser<K,V,R> {
4902	<	final BulkTask<K,V,?> parent;  // completion target
4903	<	int batch;                     // split control; -1 for unknown
4904	<	int pending;                   // completion control
4590	>	* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4591	>	* entries.  This class cannot be directly instantiated. See
4592	>	* {@link #entrySet()}.
4593	>	*/
4594	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4595	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4596	>	private static final long serialVersionUID = 2249069246763182397L;
4597	>	EntrySetView(ConcurrentHashMapV8<K,V> map) { super(map); }
4598
4599	<	BulkTask(ConcurrentHashMapV8<K,V> map, BulkTask<K,V,?> parent,
4600	<	int batch) {
4601	<	super(map);
4602	<	this.parent = parent;
4603	<	this.batch = batch;
4604	<	if (parent != null && map != null) { // split parent
4605	<	Node[] t;
4913	<	if ((t = parent.tab) == null &&
4914	<	(t = parent.tab = map.table) != null)
4915	<	parent.baseLimit = parent.baseSize = t.length;
4916	<	this.tab = t;
4917	<	this.baseSize = parent.baseSize;
4918	<	int hi = this.baseLimit = parent.baseLimit;
4919	<	parent.baseLimit = this.index = this.baseIndex =
4920	<	(hi + parent.baseIndex + 1) >>> 1;
4921	<	}
4599	>	public boolean contains(Object o) {
4600	>	Object k, v, r; Map.Entry<?,?> e;
4601	>	return ((o instanceof Map.Entry) &&
4602	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
4603	>	(r = map.get(k)) != null &&
4604	>	(v = e.getValue()) != null &&
4605	>	(v == r || v.equals(r)));
4606		}
4607
4608	<	/**
4609	<	* Forces root task to complete.
4610	<	* @param ex if null, complete normally, else exceptionally
4611	<	* @return false to simplify use
4612	<	*/
4613	<	final boolean tryCompleteComputation(Throwable ex) {
4930	<	for (BulkTask<K,V,?> a = this;;) {
4931	<	BulkTask<K,V,?> p = a.parent;
4932	<	if (p == null) {
4933	<	if (ex != null)
4934	<	a.completeExceptionally(ex);
4935	<	else
4936	<	a.quietlyComplete();
4937	<	return false;
4938	<	}
4939	<	a = p;
4940	<	}
4608	>	public boolean remove(Object o) {
4609	>	Object k, v; Map.Entry<?,?> e;
4610	>	return ((o instanceof Map.Entry) &&
4611	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
4612	>	(v = e.getValue()) != null &&
4613	>	map.remove(k, v));
4614		}
4615
4616		/**
4617	<	* Version of tryCompleteComputation for function screening checks
4617	>	* @return an iterator over the entries of the backing map
4618		*/
4619	<	final boolean abortOnNullFunction() {
4620	<	return tryCompleteComputation(new Error("Unexpected null function"));
4619	>	public Iterator<Map.Entry<K,V>> iterator() {
4620	>	ConcurrentHashMapV8<K,V> m = map;
4621	>	Node<K,V>[] t;
4622	>	int f = (t = m.table) == null ? 0 : t.length;
4623	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4624		}
4625
4626	<	// utilities
4626	>	public boolean add(Entry<K,V> e) {
4627	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4628	>	}
4629
4630	<	/** CompareAndSet pending count */
4631	<	final boolean casPending(int cmp, int val) {
4632	<	return U.compareAndSwapInt(this, PENDING, cmp, val);
4630	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4631	>	boolean added = false;
4632	>	for (Entry<K,V> e : c) {
4633	>	if (add(e))
4634	>	added = true;
4635	>	}
4636	>	return added;
4637		}
4638
4639	<	/**
4640	<	* Returns approx exp2 of the number of times (minus one) to
4641	<	* split task by two before executing leaf action. This value
4642	<	* is faster to compute and more convenient to use as a guide
4643	<	* to splitting than is the depth, since it is used while
4644	<	* dividing by two anyway.
4645	<	*/
4964	<	final int batch() {
4965	<	ConcurrentHashMapV8<K, V> m; int b; Node[] t;  ForkJoinPool pool;
4966	<	if ((b = batch) < 0 && (m = map) != null) { // force initialization
4967	<	if ((t = tab) == null && (t = tab = m.table) != null)
4968	<	baseLimit = baseSize = t.length;
4969	<	if (t != null) {
4970	<	long n = m.counter.sum();
4971	<	int par = ((pool = getPool()) == null) ?
4972	<	ForkJoinPool.getCommonPoolParallelism() :
4973	<	pool.getParallelism();
4974	<	int sp = par << 3; // slack of 8
4975	<	b = batch = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
4639	>	public final int hashCode() {
4640	>	int h = 0;
4641	>	Node<K,V>[] t;
4642	>	if ((t = map.table) != null) {
4643	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4644	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4645	>	h += p.hashCode();
4646		}
4647		}
4648	<	return b;
4648	>	return h;
4649		}
4650
4651	<	/**
4652	<	* Returns exportable snapshot entry.
4653	<	*/
4654	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
4655	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
4651	>	public final boolean equals(Object o) {
4652	>	Set<?> c;
4653	>	return ((o instanceof Set) &&
4654	>	((c = (Set<?>)o) == this ||
4655	>	(containsAll(c) && c.containsAll(this))));
4656		}
4657
4658	<	// Unsafe mechanics
4659	<	private static final sun.misc.Unsafe U;
4660	<	private static final long PENDING;
4661	<	static {
4662	<	try {
4663	<	U = getUnsafe();
4664	<	PENDING = U.objectFieldOffset
4665	<	(BulkTask.class.getDeclaredField("pending"));
4666	<	} catch (Exception e) {
4667	<	throw new Error(e);
4658	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> spliterator() {
4659	>	Node<K,V>[] t;
4660	>	ConcurrentHashMapV8<K,V> m = map;
4661	>	long n = m.sumCount();
4662	>	int f = (t = m.table) == null ? 0 : t.length;
4663	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4664	>	}
4665	>
4666	>	public void forEach(Action<? super Map.Entry<K,V>> action) {
4667	>	if (action == null) throw new NullPointerException();
4668	>	Node<K,V>[] t;
4669	>	if ((t = map.table) != null) {
4670	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4671	>	for (Node<K,V> p; (p = it.advance()) != null; )
4672	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
4673		}
4674		}
4675	+
4676		}
4677
4678	+	// -------------------------------------------------------
4679	+
4680		/**
4681	<	* Base class for non-reductive actions
4681	>	* Base class for bulk tasks. Repeats some fields and code from
4682	>	* class Traverser, because we need to subclass CountedCompleter.
4683		*/
4684	<	@SuppressWarnings("serial") static abstract class BulkAction<K,V,R> extends BulkTask<K,V,R> {
4685	<	BulkAction<K,V,?> nextTask;
4686	<	BulkAction(ConcurrentHashMapV8<K,V> map, BulkTask<K,V,?> parent,
4687	<	int batch, BulkAction<K,V,?> nextTask) {
4688	<	super(map, parent, batch);
4689	<	this.nextTask = nextTask;
4684	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4685	>	Node<K,V>[] tab;        // same as Traverser
4686	>	Node<K,V> next;
4687	>	int index;
4688	>	int baseIndex;
4689	>	int baseLimit;
4690	>	final int baseSize;
4691	>	int batch;              // split control
4692	>
4693	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4694	>	super(par);
4695	>	this.batch = b;
4696	>	this.index = this.baseIndex = i;
4697	>	if ((this.tab = t) == null)
4698	>	this.baseSize = this.baseLimit = 0;
4699	>	else if (par == null)
4700	>	this.baseSize = this.baseLimit = t.length;
4701	>	else {
4702	>	this.baseLimit = f;
4703	>	this.baseSize = par.baseSize;
4704	>	}
4705		}
4706
4707		/**
4708	<	* Try to complete task and upward parents. Upon hitting
5015	<	* non-completed parent, if a non-FJ task, try to help out the
5016	<	* computation.
4708	>	* Same as Traverser version
4709		*/
4710	<	final void tryComplete(BulkAction<K,V,?> subtasks) {
4711	<	BulkTask<K,V,?> a = this, s = a;
4712	<	for (int c;;) {
4713	<	if ((c = a.pending) == 0) {
4714	<	if ((a = (s = a).parent) == null) {
4715	<	s.quietlyComplete();
4716	<	break;
4717	<	}
4718	<	}
4719	<	else if (a.casPending(c, c - 1)) {
4720	<	if (subtasks != null && !inForkJoinPool()) {
4721	<	while ((s = a.parent) != null)
4722	<	a = s;
4723	<	while (!a.isDone()) {
4724	<	BulkAction<K,V,?> next = subtasks.nextTask;
4725	<	if (subtasks.tryUnfork())
5034	<	subtasks.exec();
5035	<	if ((subtasks = next) == null)
5036	<	break;
5037	<	}
4710	>	final Node<K,V> advance() {
4711	>	Node<K,V> e;
4712	>	if ((e = next) != null)
4713	>	e = e.next;
4714	>	for (;;) {
4715	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4716	>	if (e != null)
4717	>	return next = e;
4718	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4719	>	(n = t.length) <= (i = index) || i < 0)
4720	>	return next = null;
4721	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4722	>	if (e instanceof ForwardingNode) {
4723	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4724	>	e = null;
4725	>	continue;
4726		}
4727	<	break;
4727	>	else if (e instanceof TreeBin)
4728	>	e = ((TreeBin<K,V>)e).first;
4729	>	else
4730	>	e = null;
4731		}
4732	+	if ((index += baseSize) >= n)
4733	+	index = ++baseIndex;    // visit upper slots if present
4734		}
4735		}
5043	–
4736		}
4737
4738		/*
4739		* Task classes. Coded in a regular but ugly format/style to
4740		* simplify checks that each variant differs in the right way from
4741	<	* others.
4742	<	*/
4743	<
4744	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4745	<	extends BulkAction<K,V,Void> {
4746	<	final Action<K> action;
4741	>	* others. The null screenings exist because compilers cannot tell
4742	>	* that we've already null-checked task arguments, so we force
4743	>	* simplest hoisted bypass to help avoid convoluted traps.
4744	>	*/
4745	>	@SuppressWarnings("serial")
4746	>	static final class ForEachKeyTask<K,V>
4747	>	extends BulkTask<K,V,Void> {
4748	>	final Action<? super K> action;
4749		ForEachKeyTask
4750	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4751	<	ForEachKeyTask<K,V> nextTask,
4752	<	Action<K> action) {
5059	<	super(m, p, b, nextTask);
4750	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4751	>	Action<? super K> action) {
4752	>	super(p, b, i, f, t);
4753		this.action = action;
4754		}
4755	<	@SuppressWarnings("unchecked") public final boolean exec() {
4756	<	final Action<K> action = this.action;
4757	<	if (action == null)
4758	<	return abortOnNullFunction();
4759	<	ForEachKeyTask<K,V> subtasks = null;
4760	<	try {
4761	<	int b = batch(), c;
4762	<	while (b > 1 && baseIndex != baseLimit) {
4763	<	do {} while (!casPending(c = pending, c+1));
4764	<	(subtasks = new ForEachKeyTask<K,V>
4765	<	(map, this, b >>>= 1, subtasks, action)).fork();
4766	<	}
4767	<	while (advance() != null)
5075	<	action.apply((K)nextKey);
5076	<	} catch (Throwable ex) {
5077	<	return tryCompleteComputation(ex);
4755	>	public final void compute() {
4756	>	final Action<? super K> action;
4757	>	if ((action = this.action) != null) {
4758	>	for (int i = baseIndex, f, h; batch > 0 &&
4759	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4760	>	addToPendingCount(1);
4761	>	new ForEachKeyTask<K,V>
4762	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4763	>	action).fork();
4764	>	}
4765	>	for (Node<K,V> p; (p = advance()) != null;)
4766	>	action.apply(p.key);
4767	>	propagateCompletion();
4768		}
5079	–	tryComplete(subtasks);
5080	–	return false;
4769		}
4770		}
4771
4772	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4773	<	extends BulkAction<K,V,Void> {
4774	<	final Action<V> action;
4772	>	@SuppressWarnings("serial")
4773	>	static final class ForEachValueTask<K,V>
4774	>	extends BulkTask<K,V,Void> {
4775	>	final Action<? super V> action;
4776		ForEachValueTask
4777	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4778	<	ForEachValueTask<K,V> nextTask,
4779	<	Action<V> action) {
5091	<	super(m, p, b, nextTask);
4777	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4778	>	Action<? super V> action) {
4779	>	super(p, b, i, f, t);
4780		this.action = action;
4781		}
4782	<	@SuppressWarnings("unchecked") public final boolean exec() {
4783	<	final Action<V> action = this.action;
4784	<	if (action == null)
4785	<	return abortOnNullFunction();
4786	<	ForEachValueTask<K,V> subtasks = null;
4787	<	try {
4788	<	int b = batch(), c;
4789	<	while (b > 1 && baseIndex != baseLimit) {
4790	<	do {} while (!casPending(c = pending, c+1));
4791	<	(subtasks = new ForEachValueTask<K,V>
4792	<	(map, this, b >>>= 1, subtasks, action)).fork();
4793	<	}
4794	<	Object v;
5107	<	while ((v = advance()) != null)
5108	<	action.apply((V)v);
5109	<	} catch (Throwable ex) {
5110	<	return tryCompleteComputation(ex);
4782	>	public final void compute() {
4783	>	final Action<? super V> action;
4784	>	if ((action = this.action) != null) {
4785	>	for (int i = baseIndex, f, h; batch > 0 &&
4786	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4787	>	addToPendingCount(1);
4788	>	new ForEachValueTask<K,V>
4789	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4790	>	action).fork();
4791	>	}
4792	>	for (Node<K,V> p; (p = advance()) != null;)
4793	>	action.apply(p.val);
4794	>	propagateCompletion();
4795		}
5112	–	tryComplete(subtasks);
5113	–	return false;
4796		}
4797		}
4798
4799	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4800	<	extends BulkAction<K,V,Void> {
4801	<	final Action<Entry<K,V>> action;
4799	>	@SuppressWarnings("serial")
4800	>	static final class ForEachEntryTask<K,V>
4801	>	extends BulkTask<K,V,Void> {
4802	>	final Action<? super Entry<K,V>> action;
4803		ForEachEntryTask
4804	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4805	<	ForEachEntryTask<K,V> nextTask,
4806	<	Action<Entry<K,V>> action) {
5124	<	super(m, p, b, nextTask);
4804	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4805	>	Action<? super Entry<K,V>> action) {
4806	>	super(p, b, i, f, t);
4807		this.action = action;
4808		}
4809	<	@SuppressWarnings("unchecked") public final boolean exec() {
4810	<	final Action<Entry<K,V>> action = this.action;
4811	<	if (action == null)
4812	<	return abortOnNullFunction();
4813	<	ForEachEntryTask<K,V> subtasks = null;
4814	<	try {
4815	<	int b = batch(), c;
4816	<	while (b > 1 && baseIndex != baseLimit) {
4817	<	do {} while (!casPending(c = pending, c+1));
4818	<	(subtasks = new ForEachEntryTask<K,V>
4819	<	(map, this, b >>>= 1, subtasks, action)).fork();
4820	<	}
4821	<	Object v;
5140	<	while ((v = advance()) != null)
5141	<	action.apply(entryFor((K)nextKey, (V)v));
5142	<	} catch (Throwable ex) {
5143	<	return tryCompleteComputation(ex);
4809	>	public final void compute() {
4810	>	final Action<? super Entry<K,V>> action;
4811	>	if ((action = this.action) != null) {
4812	>	for (int i = baseIndex, f, h; batch > 0 &&
4813	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4814	>	addToPendingCount(1);
4815	>	new ForEachEntryTask<K,V>
4816	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4817	>	action).fork();
4818	>	}
4819	>	for (Node<K,V> p; (p = advance()) != null; )
4820	>	action.apply(p);
4821	>	propagateCompletion();
4822		}
5145	–	tryComplete(subtasks);
5146	–	return false;
4823		}
4824		}
4825
4826	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4827	<	extends BulkAction<K,V,Void> {
4828	<	final BiAction<K,V> action;
4826	>	@SuppressWarnings("serial")
4827	>	static final class ForEachMappingTask<K,V>
4828	>	extends BulkTask<K,V,Void> {
4829	>	final BiAction<? super K, ? super V> action;
4830		ForEachMappingTask
4831	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4832	<	ForEachMappingTask<K,V> nextTask,
4833	<	BiAction<K,V> action) {
5157	<	super(m, p, b, nextTask);
4831	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4832	>	BiAction<? super K,? super V> action) {
4833	>	super(p, b, i, f, t);
4834		this.action = action;
4835		}
4836	<	@SuppressWarnings("unchecked") public final boolean exec() {
4837	<	final BiAction<K,V> action = this.action;
4838	<	if (action == null)
4839	<	return abortOnNullFunction();
4840	<	ForEachMappingTask<K,V> subtasks = null;
4841	<	try {
4842	<	int b = batch(), c;
4843	<	while (b > 1 && baseIndex != baseLimit) {
4844	<	do {} while (!casPending(c = pending, c+1));
4845	<	(subtasks = new ForEachMappingTask<K,V>
4846	<	(map, this, b >>>= 1, subtasks, action)).fork();
4847	<	}
4848	<	Object v;
5173	<	while ((v = advance()) != null)
5174	<	action.apply((K)nextKey, (V)v);
5175	<	} catch (Throwable ex) {
5176	<	return tryCompleteComputation(ex);
4836	>	public final void compute() {
4837	>	final BiAction<? super K, ? super V> action;
4838	>	if ((action = this.action) != null) {
4839	>	for (int i = baseIndex, f, h; batch > 0 &&
4840	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4841	>	addToPendingCount(1);
4842	>	new ForEachMappingTask<K,V>
4843	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4844	>	action).fork();
4845	>	}
4846	>	for (Node<K,V> p; (p = advance()) != null; )
4847	>	action.apply(p.key, p.val);
4848	>	propagateCompletion();
4849		}
5178	–	tryComplete(subtasks);
5179	–	return false;
4850		}
4851		}
4852
4853	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4854	<	extends BulkAction<K,V,Void> {
4853	>	@SuppressWarnings("serial")
4854	>	static final class ForEachTransformedKeyTask<K,V,U>
4855	>	extends BulkTask<K,V,Void> {
4856		final Fun<? super K, ? extends U> transformer;
4857	<	final Action<U> action;
4857	>	final Action<? super U> action;
4858		ForEachTransformedKeyTask
4859	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4860	<	ForEachTransformedKeyTask<K,V,U> nextTask,
4861	<	Fun<? super K, ? extends U> transformer,
4862	<	Action<U> action) {
4863	<	super(m, p, b, nextTask);
4864	<	this.transformer = transformer;
4865	<	this.action = action;
4866	<
4867	<	}
4868	<	@SuppressWarnings("unchecked") public final boolean exec() {
4869	<	final Fun<? super K, ? extends U> transformer =
4870	<	this.transformer;
4871	<	final Action<U> action = this.action;
4872	<	if (transformer == null || action == null)
4873	<	return abortOnNullFunction();
4874	<	ForEachTransformedKeyTask<K,V,U> subtasks = null;
4875	<	try {
4876	<	int b = batch(), c;
4877	<	while (b > 1 && baseIndex != baseLimit) {
4878	<	do {} while (!casPending(c = pending, c+1));
5208	<	(subtasks = new ForEachTransformedKeyTask<K,V,U>
5209	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5210	<	}
5211	<	U u;
5212	<	while (advance() != null) {
5213	<	if ((u = transformer.apply((K)nextKey)) != null)
4859	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4860	>	Fun<? super K, ? extends U> transformer, Action<? super U> action) {
4861	>	super(p, b, i, f, t);
4862	>	this.transformer = transformer; this.action = action;
4863	>	}
4864	>	public final void compute() {
4865	>	final Fun<? super K, ? extends U> transformer;
4866	>	final Action<? super U> action;
4867	>	if ((transformer = this.transformer) != null &&
4868	>	(action = this.action) != null) {
4869	>	for (int i = baseIndex, f, h; batch > 0 &&
4870	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4871	>	addToPendingCount(1);
4872	>	new ForEachTransformedKeyTask<K,V,U>
4873	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4874	>	transformer, action).fork();
4875	>	}
4876	>	for (Node<K,V> p; (p = advance()) != null; ) {
4877	>	U u;
4878	>	if ((u = transformer.apply(p.key)) != null)
4879		action.apply(u);
4880		}
4881	<	} catch (Throwable ex) {
5217	<	return tryCompleteComputation(ex);
4881	>	propagateCompletion();
4882		}
5219	–	tryComplete(subtasks);
5220	–	return false;
4883		}
4884		}
4885
4886	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4887	<	extends BulkAction<K,V,Void> {
4886	>	@SuppressWarnings("serial")
4887	>	static final class ForEachTransformedValueTask<K,V,U>
4888	>	extends BulkTask<K,V,Void> {
4889		final Fun<? super V, ? extends U> transformer;
4890	<	final Action<U> action;
4890	>	final Action<? super U> action;
4891		ForEachTransformedValueTask
4892	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4893	<	ForEachTransformedValueTask<K,V,U> nextTask,
4894	<	Fun<? super V, ? extends U> transformer,
4895	<	Action<U> action) {
4896	<	super(m, p, b, nextTask);
4897	<	this.transformer = transformer;
4898	<	this.action = action;
4899	<
4900	<	}
4901	<	@SuppressWarnings("unchecked") public final boolean exec() {
4902	<	final Fun<? super V, ? extends U> transformer =
4903	<	this.transformer;
4904	<	final Action<U> action = this.action;
4905	<	if (transformer == null || action == null)
4906	<	return abortOnNullFunction();
4907	<	ForEachTransformedValueTask<K,V,U> subtasks = null;
4908	<	try {
4909	<	int b = batch(), c;
4910	<	while (b > 1 && baseIndex != baseLimit) {
4911	<	do {} while (!casPending(c = pending, c+1));
5249	<	(subtasks = new ForEachTransformedValueTask<K,V,U>
5250	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5251	<	}
5252	<	Object v; U u;
5253	<	while ((v = advance()) != null) {
5254	<	if ((u = transformer.apply((V)v)) != null)
4892	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4893	>	Fun<? super V, ? extends U> transformer, Action<? super U> action) {
4894	>	super(p, b, i, f, t);
4895	>	this.transformer = transformer; this.action = action;
4896	>	}
4897	>	public final void compute() {
4898	>	final Fun<? super V, ? extends U> transformer;
4899	>	final Action<? super U> action;
4900	>	if ((transformer = this.transformer) != null &&
4901	>	(action = this.action) != null) {
4902	>	for (int i = baseIndex, f, h; batch > 0 &&
4903	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4904	>	addToPendingCount(1);
4905	>	new ForEachTransformedValueTask<K,V,U>
4906	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4907	>	transformer, action).fork();
4908	>	}
4909	>	for (Node<K,V> p; (p = advance()) != null; ) {
4910	>	U u;
4911	>	if ((u = transformer.apply(p.val)) != null)
4912		action.apply(u);
4913		}
4914	<	} catch (Throwable ex) {
5258	<	return tryCompleteComputation(ex);
4914	>	propagateCompletion();
4915		}
5260	–	tryComplete(subtasks);
5261	–	return false;
4916		}
4917		}
4918
4919	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4920	<	extends BulkAction<K,V,Void> {
4919	>	@SuppressWarnings("serial")
4920	>	static final class ForEachTransformedEntryTask<K,V,U>
4921	>	extends BulkTask<K,V,Void> {
4922		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4923	<	final Action<U> action;
4923	>	final Action<? super U> action;
4924		ForEachTransformedEntryTask
4925	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4926	<	ForEachTransformedEntryTask<K,V,U> nextTask,
4927	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4928	<	Action<U> action) {
4929	<	super(m, p, b, nextTask);
4930	<	this.transformer = transformer;
4931	<	this.action = action;
4932	<
4933	<	}
4934	<	@SuppressWarnings("unchecked") public final boolean exec() {
4935	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
4936	<	this.transformer;
4937	<	final Action<U> action = this.action;
4938	<	if (transformer == null || action == null)
4939	<	return abortOnNullFunction();
4940	<	ForEachTransformedEntryTask<K,V,U> subtasks = null;
4941	<	try {
4942	<	int b = batch(), c;
4943	<	while (b > 1 && baseIndex != baseLimit) {
4944	<	do {} while (!casPending(c = pending, c+1));
5290	<	(subtasks = new ForEachTransformedEntryTask<K,V,U>
5291	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5292	<	}
5293	<	Object v; U u;
5294	<	while ((v = advance()) != null) {
5295	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
4925	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4926	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<? super U> action) {
4927	>	super(p, b, i, f, t);
4928	>	this.transformer = transformer; this.action = action;
4929	>	}
4930	>	public final void compute() {
4931	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
4932	>	final Action<? super U> action;
4933	>	if ((transformer = this.transformer) != null &&
4934	>	(action = this.action) != null) {
4935	>	for (int i = baseIndex, f, h; batch > 0 &&
4936	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4937	>	addToPendingCount(1);
4938	>	new ForEachTransformedEntryTask<K,V,U>
4939	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4940	>	transformer, action).fork();
4941	>	}
4942	>	for (Node<K,V> p; (p = advance()) != null; ) {
4943	>	U u;
4944	>	if ((u = transformer.apply(p)) != null)
4945		action.apply(u);
4946		}
4947	<	} catch (Throwable ex) {
5299	<	return tryCompleteComputation(ex);
4947	>	propagateCompletion();
4948		}
5301	–	tryComplete(subtasks);
5302	–	return false;
4949		}
4950		}
4951
4952	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4953	<	extends BulkAction<K,V,Void> {
4952	>	@SuppressWarnings("serial")
4953	>	static final class ForEachTransformedMappingTask<K,V,U>
4954	>	extends BulkTask<K,V,Void> {
4955		final BiFun<? super K, ? super V, ? extends U> transformer;
4956	<	final Action<U> action;
4956	>	final Action<? super U> action;
4957		ForEachTransformedMappingTask
4958	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5312	<	ForEachTransformedMappingTask<K,V,U> nextTask,
4958	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4959		BiFun<? super K, ? super V, ? extends U> transformer,
4960	<	Action<U> action) {
4961	<	super(m, p, b, nextTask);
4962	<	this.transformer = transformer;
4963	<	this.action = action;
4964	<
4965	<	}
4966	<	@SuppressWarnings("unchecked") public final boolean exec() {
4967	<	final BiFun<? super K, ? super V, ? extends U> transformer =
4968	<	this.transformer;
4969	<	final Action<U> action = this.action;
4970	<	if (transformer == null || action == null)
4971	<	return abortOnNullFunction();
4972	<	ForEachTransformedMappingTask<K,V,U> subtasks = null;
4973	<	try {
4974	<	int b = batch(), c;
4975	<	while (b > 1 && baseIndex != baseLimit) {
4976	<	do {} while (!casPending(c = pending, c+1));
4977	<	(subtasks = new ForEachTransformedMappingTask<K,V,U>
4978	<	(map, this, b >>>= 1, subtasks, transformer, action)).fork();
5333	<	}
5334	<	Object v; U u;
5335	<	while ((v = advance()) != null) {
5336	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
4960	>	Action<? super U> action) {
4961	>	super(p, b, i, f, t);
4962	>	this.transformer = transformer; this.action = action;
4963	>	}
4964	>	public final void compute() {
4965	>	final BiFun<? super K, ? super V, ? extends U> transformer;
4966	>	final Action<? super U> action;
4967	>	if ((transformer = this.transformer) != null &&
4968	>	(action = this.action) != null) {
4969	>	for (int i = baseIndex, f, h; batch > 0 &&
4970	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4971	>	addToPendingCount(1);
4972	>	new ForEachTransformedMappingTask<K,V,U>
4973	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4974	>	transformer, action).fork();
4975	>	}
4976	>	for (Node<K,V> p; (p = advance()) != null; ) {
4977	>	U u;
4978	>	if ((u = transformer.apply(p.key, p.val)) != null)
4979		action.apply(u);
4980		}
4981	<	} catch (Throwable ex) {
5340	<	return tryCompleteComputation(ex);
4981	>	propagateCompletion();
4982		}
5342	–	tryComplete(subtasks);
5343	–	return false;
4983		}
4984		}
4985
4986	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4987	<	extends BulkAction<K,V,U> {
4986	>	@SuppressWarnings("serial")
4987	>	static final class SearchKeysTask<K,V,U>
4988	>	extends BulkTask<K,V,U> {
4989		final Fun<? super K, ? extends U> searchFunction;
4990		final AtomicReference<U> result;
4991		SearchKeysTask
4992	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5353	<	SearchKeysTask<K,V,U> nextTask,
4992	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4993		Fun<? super K, ? extends U> searchFunction,
4994		AtomicReference<U> result) {
4995	<	super(m, p, b, nextTask);
4995	>	super(p, b, i, f, t);
4996		this.searchFunction = searchFunction; this.result = result;
4997		}
4998	<	@SuppressWarnings("unchecked") public final boolean exec() {
4999	<	AtomicReference<U> result = this.result;
5000	<	final Fun<? super K, ? extends U> searchFunction =
5001	<	this.searchFunction;
5002	<	if (searchFunction == null || result == null)
5003	<	return abortOnNullFunction();
5004	<	SearchKeysTask<K,V,U> subtasks = null;
5005	<	try {
5006	<	int b = batch(), c;
5007	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5008	<	do {} while (!casPending(c = pending, c+1));
5009	<	(subtasks = new SearchKeysTask<K,V,U>
5010	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5011	<	}
5012	<	U u;
5013	<	while (result.get() == null && advance() != null) {
5014	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
4998	>	public final U getRawResult() { return result.get(); }
4999	>	public final void compute() {
5000	>	final Fun<? super K, ? extends U> searchFunction;
5001	>	final AtomicReference<U> result;
5002	>	if ((searchFunction = this.searchFunction) != null &&
5003	>	(result = this.result) != null) {
5004	>	for (int i = baseIndex, f, h; batch > 0 &&
5005	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5006	>	if (result.get() != null)
5007	>	return;
5008	>	addToPendingCount(1);
5009	>	new SearchKeysTask<K,V,U>
5010	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5011	>	searchFunction, result).fork();
5012	>	}
5013	>	while (result.get() == null) {
5014	>	U u;
5015	>	Node<K,V> p;
5016	>	if ((p = advance()) == null) {
5017	>	propagateCompletion();
5018	>	break;
5019	>	}
5020	>	if ((u = searchFunction.apply(p.key)) != null) {
5021		if (result.compareAndSet(null, u))
5022	<	tryCompleteComputation(null);
5022	>	quietlyCompleteRoot();
5023		break;
5024		}
5025		}
5381	–	} catch (Throwable ex) {
5382	–	return tryCompleteComputation(ex);
5026		}
5384	–	tryComplete(subtasks);
5385	–	return false;
5027		}
5387	–	public final U getRawResult() { return result.get(); }
5028		}
5029
5030	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
5031	<	extends BulkAction<K,V,U> {
5030	>	@SuppressWarnings("serial")
5031	>	static final class SearchValuesTask<K,V,U>
5032	>	extends BulkTask<K,V,U> {
5033		final Fun<? super V, ? extends U> searchFunction;
5034		final AtomicReference<U> result;
5035		SearchValuesTask
5036	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5396	<	SearchValuesTask<K,V,U> nextTask,
5036	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5037		Fun<? super V, ? extends U> searchFunction,
5038		AtomicReference<U> result) {
5039	<	super(m, p, b, nextTask);
5039	>	super(p, b, i, f, t);
5040		this.searchFunction = searchFunction; this.result = result;
5041		}
5042	<	@SuppressWarnings("unchecked") public final boolean exec() {
5043	<	AtomicReference<U> result = this.result;
5044	<	final Fun<? super V, ? extends U> searchFunction =
5045	<	this.searchFunction;
5046	<	if (searchFunction == null || result == null)
5047	<	return abortOnNullFunction();
5048	<	SearchValuesTask<K,V,U> subtasks = null;
5049	<	try {
5050	<	int b = batch(), c;
5051	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5052	<	do {} while (!casPending(c = pending, c+1));
5053	<	(subtasks = new SearchValuesTask<K,V,U>
5054	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5055	<	}
5056	<	Object v; U u;
5057	<	while (result.get() == null && (v = advance()) != null) {
5058	<	if ((u = searchFunction.apply((V)v)) != null) {
5042	>	public final U getRawResult() { return result.get(); }
5043	>	public final void compute() {
5044	>	final Fun<? super V, ? extends U> searchFunction;
5045	>	final AtomicReference<U> result;
5046	>	if ((searchFunction = this.searchFunction) != null &&
5047	>	(result = this.result) != null) {
5048	>	for (int i = baseIndex, f, h; batch > 0 &&
5049	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5050	>	if (result.get() != null)
5051	>	return;
5052	>	addToPendingCount(1);
5053	>	new SearchValuesTask<K,V,U>
5054	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5055	>	searchFunction, result).fork();
5056	>	}
5057	>	while (result.get() == null) {
5058	>	U u;
5059	>	Node<K,V> p;
5060	>	if ((p = advance()) == null) {
5061	>	propagateCompletion();
5062	>	break;
5063	>	}
5064	>	if ((u = searchFunction.apply(p.val)) != null) {
5065		if (result.compareAndSet(null, u))
5066	<	tryCompleteComputation(null);
5066	>	quietlyCompleteRoot();
5067		break;
5068		}
5069		}
5424	–	} catch (Throwable ex) {
5425	–	return tryCompleteComputation(ex);
5070		}
5427	–	tryComplete(subtasks);
5428	–	return false;
5071		}
5430	–	public final U getRawResult() { return result.get(); }
5072		}
5073
5074	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5075	<	extends BulkAction<K,V,U> {
5074	>	@SuppressWarnings("serial")
5075	>	static final class SearchEntriesTask<K,V,U>
5076	>	extends BulkTask<K,V,U> {
5077		final Fun<Entry<K,V>, ? extends U> searchFunction;
5078		final AtomicReference<U> result;
5079		SearchEntriesTask
5080	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5439	<	SearchEntriesTask<K,V,U> nextTask,
5080	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5081		Fun<Entry<K,V>, ? extends U> searchFunction,
5082		AtomicReference<U> result) {
5083	<	super(m, p, b, nextTask);
5083	>	super(p, b, i, f, t);
5084		this.searchFunction = searchFunction; this.result = result;
5085		}
5086	<	@SuppressWarnings("unchecked") public final boolean exec() {
5087	<	AtomicReference<U> result = this.result;
5088	<	final Fun<Entry<K,V>, ? extends U> searchFunction =
5089	<	this.searchFunction;
5090	<	if (searchFunction == null || result == null)
5091	<	return abortOnNullFunction();
5092	<	SearchEntriesTask<K,V,U> subtasks = null;
5093	<	try {
5094	<	int b = batch(), c;
5095	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5096	<	do {} while (!casPending(c = pending, c+1));
5097	<	(subtasks = new SearchEntriesTask<K,V,U>
5098	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5099	<	}
5100	<	Object v; U u;
5101	<	while (result.get() == null && (v = advance()) != null) {
5102	<	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
5103	<	if (result.compareAndSet(null, u))
5104	<	tryCompleteComputation(null);
5086	>	public final U getRawResult() { return result.get(); }
5087	>	public final void compute() {
5088	>	final Fun<Entry<K,V>, ? extends U> searchFunction;
5089	>	final AtomicReference<U> result;
5090	>	if ((searchFunction = this.searchFunction) != null &&
5091	>	(result = this.result) != null) {
5092	>	for (int i = baseIndex, f, h; batch > 0 &&
5093	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5094	>	if (result.get() != null)
5095	>	return;
5096	>	addToPendingCount(1);
5097	>	new SearchEntriesTask<K,V,U>
5098	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5099	>	searchFunction, result).fork();
5100	>	}
5101	>	while (result.get() == null) {
5102	>	U u;
5103	>	Node<K,V> p;
5104	>	if ((p = advance()) == null) {
5105	>	propagateCompletion();
5106		break;
5107		}
5108	+	if ((u = searchFunction.apply(p)) != null) {
5109	+	if (result.compareAndSet(null, u))
5110	+	quietlyCompleteRoot();
5111	+	return;
5112	+	}
5113		}
5467	–	} catch (Throwable ex) {
5468	–	return tryCompleteComputation(ex);
5114		}
5470	–	tryComplete(subtasks);
5471	–	return false;
5115		}
5473	–	public final U getRawResult() { return result.get(); }
5116		}
5117
5118	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5119	<	extends BulkAction<K,V,U> {
5118	>	@SuppressWarnings("serial")
5119	>	static final class SearchMappingsTask<K,V,U>
5120	>	extends BulkTask<K,V,U> {
5121		final BiFun<? super K, ? super V, ? extends U> searchFunction;
5122		final AtomicReference<U> result;
5123		SearchMappingsTask
5124	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5482	<	SearchMappingsTask<K,V,U> nextTask,
5124	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5125		BiFun<? super K, ? super V, ? extends U> searchFunction,
5126		AtomicReference<U> result) {
5127	<	super(m, p, b, nextTask);
5127	>	super(p, b, i, f, t);
5128		this.searchFunction = searchFunction; this.result = result;
5129		}
5130	<	@SuppressWarnings("unchecked") public final boolean exec() {
5131	<	AtomicReference<U> result = this.result;
5132	<	final BiFun<? super K, ? super V, ? extends U> searchFunction =
5133	<	this.searchFunction;
5134	<	if (searchFunction == null || result == null)
5135	<	return abortOnNullFunction();
5136	<	SearchMappingsTask<K,V,U> subtasks = null;
5137	<	try {
5138	<	int b = batch(), c;
5139	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
5140	<	do {} while (!casPending(c = pending, c+1));
5141	<	(subtasks = new SearchMappingsTask<K,V,U>
5142	<	(map, this, b >>>= 1, subtasks, searchFunction, result)).fork();
5143	<	}
5144	<	Object v; U u;
5145	<	while (result.get() == null && (v = advance()) != null) {
5146	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5130	>	public final U getRawResult() { return result.get(); }
5131	>	public final void compute() {
5132	>	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5133	>	final AtomicReference<U> result;
5134	>	if ((searchFunction = this.searchFunction) != null &&
5135	>	(result = this.result) != null) {
5136	>	for (int i = baseIndex, f, h; batch > 0 &&
5137	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5138	>	if (result.get() != null)
5139	>	return;
5140	>	addToPendingCount(1);
5141	>	new SearchMappingsTask<K,V,U>
5142	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5143	>	searchFunction, result).fork();
5144	>	}
5145	>	while (result.get() == null) {
5146	>	U u;
5147	>	Node<K,V> p;
5148	>	if ((p = advance()) == null) {
5149	>	propagateCompletion();
5150	>	break;
5151	>	}
5152	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5153		if (result.compareAndSet(null, u))
5154	<	tryCompleteComputation(null);
5154	>	quietlyCompleteRoot();
5155		break;
5156		}
5157		}
5510	–	} catch (Throwable ex) {
5511	–	return tryCompleteComputation(ex);
5158		}
5513	–	tryComplete(subtasks);
5514	–	return false;
5159		}
5516	–	public final U getRawResult() { return result.get(); }
5160		}
5161
5162	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5162	>	@SuppressWarnings("serial")
5163	>	static final class ReduceKeysTask<K,V>
5164		extends BulkTask<K,V,K> {
5165		final BiFun<? super K, ? super K, ? extends K> reducer;
5166		K result;
5167		ReduceKeysTask<K,V> rights, nextRight;
5168		ReduceKeysTask
5169	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5169	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5170		ReduceKeysTask<K,V> nextRight,
5171		BiFun<? super K, ? super K, ? extends K> reducer) {
5172	<	super(m, p, b); this.nextRight = nextRight;
5172	>	super(p, b, i, f, t); this.nextRight = nextRight;
5173		this.reducer = reducer;
5174		}
5175	<	@SuppressWarnings("unchecked") public final boolean exec() {
5176	<	final BiFun<? super K, ? super K, ? extends K> reducer =
5177	<	this.reducer;
5178	<	if (reducer == null)
5179	<	return abortOnNullFunction();
5180	<	try {
5181	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5538	<	do {} while (!casPending(c = pending, c+1));
5175	>	public final K getRawResult() { return result; }
5176	>	public final void compute() {
5177	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5178	>	if ((reducer = this.reducer) != null) {
5179	>	for (int i = baseIndex, f, h; batch > 0 &&
5180	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5181	>	addToPendingCount(1);
5182		(rights = new ReduceKeysTask<K,V>
5183	<	(map, this, b >>>= 1, rights, reducer)).fork();
5183	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5184	>	rights, reducer)).fork();
5185		}
5186		K r = null;
5187	<	while (advance() != null) {
5188	<	K u = (K)nextKey;
5189	<	r = (r == null) ? u : reducer.apply(r, u);
5187	>	for (Node<K,V> p; (p = advance()) != null; ) {
5188	>	K u = p.key;
5189	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5190		}
5191		result = r;
5192	<	for (ReduceKeysTask<K,V> t = this, s;;) {
5193	<	int c; BulkTask<K,V,?> par; K tr, sr;
5194	<	if ((c = t.pending) == 0) {
5195	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5196	<	if ((sr = s.result) != null)
5197	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5198	<	}
5199	<	if ((par = t.parent) == null ||
5200	<	!(par instanceof ReduceKeysTask)) {
5201	<	t.quietlyComplete();
5202	<	break;
5559	<	}
5560	<	t = (ReduceKeysTask<K,V>)par;
5192	>	CountedCompleter<?> c;
5193	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5194	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5195	>	t = (ReduceKeysTask<K,V>)c,
5196	>	s = t.rights;
5197	>	while (s != null) {
5198	>	K tr, sr;
5199	>	if ((sr = s.result) != null)
5200	>	t.result = (((tr = t.result) == null) ? sr :
5201	>	reducer.apply(tr, sr));
5202	>	s = t.rights = s.nextRight;
5203		}
5562	–	else if (t.casPending(c, c - 1))
5563	–	break;
5204		}
5565	–	} catch (Throwable ex) {
5566	–	return tryCompleteComputation(ex);
5205		}
5568	–	ReduceKeysTask<K,V> s = rights;
5569	–	if (s != null && !inForkJoinPool()) {
5570	–	do  {
5571	–	if (s.tryUnfork())
5572	–	s.exec();
5573	–	} while ((s = s.nextRight) != null);
5574	–	}
5575	–	return false;
5206		}
5577	–	public final K getRawResult() { return result; }
5207		}
5208
5209	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5209	>	@SuppressWarnings("serial")
5210	>	static final class ReduceValuesTask<K,V>
5211		extends BulkTask<K,V,V> {
5212		final BiFun<? super V, ? super V, ? extends V> reducer;
5213		V result;
5214		ReduceValuesTask<K,V> rights, nextRight;
5215		ReduceValuesTask
5216	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5216	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5217		ReduceValuesTask<K,V> nextRight,
5218		BiFun<? super V, ? super V, ? extends V> reducer) {
5219	<	super(m, p, b); this.nextRight = nextRight;
5219	>	super(p, b, i, f, t); this.nextRight = nextRight;
5220		this.reducer = reducer;
5221		}
5222	<	@SuppressWarnings("unchecked") public final boolean exec() {
5223	<	final BiFun<? super V, ? super V, ? extends V> reducer =
5224	<	this.reducer;
5225	<	if (reducer == null)
5226	<	return abortOnNullFunction();
5227	<	try {
5228	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5599	<	do {} while (!casPending(c = pending, c+1));
5222	>	public final V getRawResult() { return result; }
5223	>	public final void compute() {
5224	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5225	>	if ((reducer = this.reducer) != null) {
5226	>	for (int i = baseIndex, f, h; batch > 0 &&
5227	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5228	>	addToPendingCount(1);
5229		(rights = new ReduceValuesTask<K,V>
5230	<	(map, this, b >>>= 1, rights, reducer)).fork();
5230	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5231	>	rights, reducer)).fork();
5232		}
5233		V r = null;
5234	<	Object v;
5235	<	while ((v = advance()) != null) {
5236	<	V u = (V)v;
5607	<	r = (r == null) ? u : reducer.apply(r, u);
5234	>	for (Node<K,V> p; (p = advance()) != null; ) {
5235	>	V v = p.val;
5236	>	r = (r == null) ? v : reducer.apply(r, v);
5237		}
5238		result = r;
5239	<	for (ReduceValuesTask<K,V> t = this, s;;) {
5240	<	int c; BulkTask<K,V,?> par; V tr, sr;
5241	<	if ((c = t.pending) == 0) {
5242	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5243	<	if ((sr = s.result) != null)
5244	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5245	<	}
5246	<	if ((par = t.parent) == null ||
5247	<	!(par instanceof ReduceValuesTask)) {
5248	<	t.quietlyComplete();
5249	<	break;
5621	<	}
5622	<	t = (ReduceValuesTask<K,V>)par;
5239	>	CountedCompleter<?> c;
5240	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5241	>	@SuppressWarnings("unchecked") 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;
5250		}
5624	–	else if (t.casPending(c, c - 1))
5625	–	break;
5251		}
5627	–	} catch (Throwable ex) {
5628	–	return tryCompleteComputation(ex);
5629	–	}
5630	–	ReduceValuesTask<K,V> s = rights;
5631	–	if (s != null && !inForkJoinPool()) {
5632	–	do  {
5633	–	if (s.tryUnfork())
5634	–	s.exec();
5635	–	} while ((s = s.nextRight) != null);
5252		}
5637	–	return false;
5253		}
5639	–	public final V getRawResult() { return result; }
5254		}
5255
5256	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5256	>	@SuppressWarnings("serial")
5257	>	static final class ReduceEntriesTask<K,V>
5258		extends BulkTask<K,V,Map.Entry<K,V>> {
5259		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5260		Map.Entry<K,V> result;
5261		ReduceEntriesTask<K,V> rights, nextRight;
5262		ReduceEntriesTask
5263	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5263	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5264		ReduceEntriesTask<K,V> nextRight,
5265		BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5266	<	super(m, p, b); this.nextRight = nextRight;
5266	>	super(p, b, i, f, t); this.nextRight = nextRight;
5267		this.reducer = reducer;
5268		}
5269	<	@SuppressWarnings("unchecked") public final boolean exec() {
5270	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5271	<	this.reducer;
5272	<	if (reducer == null)
5273	<	return abortOnNullFunction();
5274	<	try {
5275	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5661	<	do {} while (!casPending(c = pending, c+1));
5269	>	public final Map.Entry<K,V> getRawResult() { return result; }
5270	>	public final void compute() {
5271	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5272	>	if ((reducer = this.reducer) != null) {
5273	>	for (int i = baseIndex, f, h; batch > 0 &&
5274	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5275	>	addToPendingCount(1);
5276		(rights = new ReduceEntriesTask<K,V>
5277	<	(map, this, b >>>= 1, rights, reducer)).fork();
5277	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5278	>	rights, reducer)).fork();
5279		}
5280		Map.Entry<K,V> r = null;
5281	<	Object v;
5282	<	while ((v = advance()) != null) {
5668	<	Map.Entry<K,V> u = entryFor((K)nextKey, (V)v);
5669	<	r = (r == null) ? u : reducer.apply(r, u);
5670	<	}
5281	>	for (Node<K,V> p; (p = advance()) != null; )
5282	>	r = (r == null) ? p : reducer.apply(r, p);
5283		result = r;
5284	<	for (ReduceEntriesTask<K,V> t = this, s;;) {
5285	<	int c; BulkTask<K,V,?> par; Map.Entry<K,V> tr, sr;
5286	<	if ((c = t.pending) == 0) {
5287	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5288	<	if ((sr = s.result) != null)
5289	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5290	<	}
5291	<	if ((par = t.parent) == null ||
5292	<	!(par instanceof ReduceEntriesTask)) {
5293	<	t.quietlyComplete();
5294	<	break;
5683	<	}
5684	<	t = (ReduceEntriesTask<K,V>)par;
5284	>	CountedCompleter<?> c;
5285	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5286	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5287	>	t = (ReduceEntriesTask<K,V>)c,
5288	>	s = t.rights;
5289	>	while (s != null) {
5290	>	Map.Entry<K,V> tr, sr;
5291	>	if ((sr = s.result) != null)
5292	>	t.result = (((tr = t.result) == null) ? sr :
5293	>	reducer.apply(tr, sr));
5294	>	s = t.rights = s.nextRight;
5295		}
5686	–	else if (t.casPending(c, c - 1))
5687	–	break;
5296		}
5689	–	} catch (Throwable ex) {
5690	–	return tryCompleteComputation(ex);
5297		}
5692	–	ReduceEntriesTask<K,V> s = rights;
5693	–	if (s != null && !inForkJoinPool()) {
5694	–	do  {
5695	–	if (s.tryUnfork())
5696	–	s.exec();
5697	–	} while ((s = s.nextRight) != null);
5698	–	}
5699	–	return false;
5298		}
5701	–	public final Map.Entry<K,V> getRawResult() { return result; }
5299		}
5300
5301	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5301	>	@SuppressWarnings("serial")
5302	>	static final class MapReduceKeysTask<K,V,U>
5303		extends BulkTask<K,V,U> {
5304		final Fun<? super K, ? extends U> transformer;
5305		final BiFun<? super U, ? super U, ? extends U> reducer;
5306		U result;
5307		MapReduceKeysTask<K,V,U> rights, nextRight;
5308		MapReduceKeysTask
5309	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5309	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5310		MapReduceKeysTask<K,V,U> nextRight,
5311		Fun<? super K, ? extends U> transformer,
5312		BiFun<? super U, ? super U, ? extends U> reducer) {
5313	<	super(m, p, b); this.nextRight = nextRight;
5313	>	super(p, b, i, f, t); this.nextRight = nextRight;
5314		this.transformer = transformer;
5315		this.reducer = reducer;
5316		}
5317	<	@SuppressWarnings("unchecked") public final boolean exec() {
5318	<	final Fun<? super K, ? extends U> transformer =
5319	<	this.transformer;
5320	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5321	<	this.reducer;
5322	<	if (transformer == null || reducer == null)
5323	<	return abortOnNullFunction();
5324	<	try {
5325	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5728	<	do {} while (!casPending(c = pending, c+1));
5317	>	public final U getRawResult() { return result; }
5318	>	public final void compute() {
5319	>	final Fun<? super K, ? extends U> transformer;
5320	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5321	>	if ((transformer = this.transformer) != null &&
5322	>	(reducer = this.reducer) != null) {
5323	>	for (int i = baseIndex, f, h; batch > 0 &&
5324	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5325	>	addToPendingCount(1);
5326		(rights = new MapReduceKeysTask<K,V,U>
5327	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5327	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5328	>	rights, transformer, reducer)).fork();
5329		}
5330	<	U r = null, u;
5331	<	while (advance() != null) {
5332	<	if ((u = transformer.apply((K)nextKey)) != null)
5330	>	U r = null;
5331	>	for (Node<K,V> p; (p = advance()) != null; ) {
5332	>	U u;
5333	>	if ((u = transformer.apply(p.key)) != null)
5334		r = (r == null) ? u : reducer.apply(r, u);
5335		}
5336		result = r;
5337	<	for (MapReduceKeysTask<K,V,U> t = this, s;;) {
5338	<	int c; BulkTask<K,V,?> par; U tr, sr;
5339	<	if ((c = t.pending) == 0) {
5340	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5341	<	if ((sr = s.result) != null)
5342	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5343	<	}
5344	<	if ((par = t.parent) == null ||
5345	<	!(par instanceof MapReduceKeysTask)) {
5346	<	t.quietlyComplete();
5347	<	break;
5749	<	}
5750	<	t = (MapReduceKeysTask<K,V,U>)par;
5337	>	CountedCompleter<?> c;
5338	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5339	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5340	>	t = (MapReduceKeysTask<K,V,U>)c,
5341	>	s = t.rights;
5342	>	while (s != null) {
5343	>	U tr, sr;
5344	>	if ((sr = s.result) != null)
5345	>	t.result = (((tr = t.result) == null) ? sr :
5346	>	reducer.apply(tr, sr));
5347	>	s = t.rights = s.nextRight;
5348		}
5752	–	else if (t.casPending(c, c - 1))
5753	–	break;
5349		}
5755	–	} catch (Throwable ex) {
5756	–	return tryCompleteComputation(ex);
5757	–	}
5758	–	MapReduceKeysTask<K,V,U> s = rights;
5759	–	if (s != null && !inForkJoinPool()) {
5760	–	do  {
5761	–	if (s.tryUnfork())
5762	–	s.exec();
5763	–	} while ((s = s.nextRight) != null);
5350		}
5765	–	return false;
5351		}
5767	–	public final U getRawResult() { return result; }
5352		}
5353
5354	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5354	>	@SuppressWarnings("serial")
5355	>	static final class MapReduceValuesTask<K,V,U>
5356		extends BulkTask<K,V,U> {
5357		final Fun<? super V, ? extends U> transformer;
5358		final BiFun<? super U, ? super U, ? extends U> reducer;
5359		U result;
5360		MapReduceValuesTask<K,V,U> rights, nextRight;
5361		MapReduceValuesTask
5362	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5362	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5363		MapReduceValuesTask<K,V,U> nextRight,
5364		Fun<? super V, ? extends U> transformer,
5365		BiFun<? super U, ? super U, ? extends U> reducer) {
5366	<	super(m, p, b); this.nextRight = nextRight;
5366	>	super(p, b, i, f, t); this.nextRight = nextRight;
5367		this.transformer = transformer;
5368		this.reducer = reducer;
5369		}
5370	<	@SuppressWarnings("unchecked") public final boolean exec() {
5371	<	final Fun<? super V, ? extends U> transformer =
5372	<	this.transformer;
5373	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5374	<	this.reducer;
5375	<	if (transformer == null || reducer == null)
5376	<	return abortOnNullFunction();
5377	<	try {
5378	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5794	<	do {} while (!casPending(c = pending, c+1));
5370	>	public final U getRawResult() { return result; }
5371	>	public final void compute() {
5372	>	final Fun<? super V, ? extends U> transformer;
5373	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5374	>	if ((transformer = this.transformer) != null &&
5375	>	(reducer = this.reducer) != null) {
5376	>	for (int i = baseIndex, f, h; batch > 0 &&
5377	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5378	>	addToPendingCount(1);
5379		(rights = new MapReduceValuesTask<K,V,U>
5380	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5380	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5381	>	rights, transformer, reducer)).fork();
5382		}
5383	<	U r = null, u;
5384	<	Object v;
5385	<	while ((v = advance()) != null) {
5386	<	if ((u = transformer.apply((V)v)) != null)
5383	>	U r = null;
5384	>	for (Node<K,V> p; (p = advance()) != null; ) {
5385	>	U u;
5386	>	if ((u = transformer.apply(p.val)) != null)
5387		r = (r == null) ? u : reducer.apply(r, u);
5388		}
5389		result = r;
5390	<	for (MapReduceValuesTask<K,V,U> t = this, s;;) {
5391	<	int c; BulkTask<K,V,?> par; U tr, sr;
5392	<	if ((c = t.pending) == 0) {
5393	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5394	<	if ((sr = s.result) != null)
5395	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5396	<	}
5397	<	if ((par = t.parent) == null ||
5398	<	!(par instanceof MapReduceValuesTask)) {
5399	<	t.quietlyComplete();
5400	<	break;
5816	<	}
5817	<	t = (MapReduceValuesTask<K,V,U>)par;
5390	>	CountedCompleter<?> c;
5391	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5392	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5393	>	t = (MapReduceValuesTask<K,V,U>)c,
5394	>	s = t.rights;
5395	>	while (s != null) {
5396	>	U tr, sr;
5397	>	if ((sr = s.result) != null)
5398	>	t.result = (((tr = t.result) == null) ? sr :
5399	>	reducer.apply(tr, sr));
5400	>	s = t.rights = s.nextRight;
5401		}
5819	–	else if (t.casPending(c, c - 1))
5820	–	break;
5402		}
5822	–	} catch (Throwable ex) {
5823	–	return tryCompleteComputation(ex);
5824	–	}
5825	–	MapReduceValuesTask<K,V,U> s = rights;
5826	–	if (s != null && !inForkJoinPool()) {
5827	–	do  {
5828	–	if (s.tryUnfork())
5829	–	s.exec();
5830	–	} while ((s = s.nextRight) != null);
5403		}
5832	–	return false;
5404		}
5834	–	public final U getRawResult() { return result; }
5405		}
5406
5407	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5407	>	@SuppressWarnings("serial")
5408	>	static final class MapReduceEntriesTask<K,V,U>
5409		extends BulkTask<K,V,U> {
5410		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5411		final BiFun<? super U, ? super U, ? extends U> reducer;
5412		U result;
5413		MapReduceEntriesTask<K,V,U> rights, nextRight;
5414		MapReduceEntriesTask
5415	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5415	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5416		MapReduceEntriesTask<K,V,U> nextRight,
5417		Fun<Map.Entry<K,V>, ? extends U> transformer,
5418		BiFun<? super U, ? super U, ? extends U> reducer) {
5419	<	super(m, p, b); this.nextRight = nextRight;
5419	>	super(p, b, i, f, t); this.nextRight = nextRight;
5420		this.transformer = transformer;
5421		this.reducer = reducer;
5422		}
5423	<	@SuppressWarnings("unchecked") public final boolean exec() {
5424	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5425	<	this.transformer;
5426	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5427	<	this.reducer;
5428	<	if (transformer == null || reducer == null)
5429	<	return abortOnNullFunction();
5430	<	try {
5431	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5861	<	do {} while (!casPending(c = pending, c+1));
5423	>	public final U getRawResult() { return result; }
5424	>	public final void compute() {
5425	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5426	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5427	>	if ((transformer = this.transformer) != null &&
5428	>	(reducer = this.reducer) != null) {
5429	>	for (int i = baseIndex, f, h; batch > 0 &&
5430	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5431	>	addToPendingCount(1);
5432		(rights = new MapReduceEntriesTask<K,V,U>
5433	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5433	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5434	>	rights, transformer, reducer)).fork();
5435		}
5436	<	U r = null, u;
5437	<	Object v;
5438	<	while ((v = advance()) != null) {
5439	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5436	>	U r = null;
5437	>	for (Node<K,V> p; (p = advance()) != null; ) {
5438	>	U u;
5439	>	if ((u = transformer.apply(p)) != null)
5440		r = (r == null) ? u : reducer.apply(r, u);
5441		}
5442		result = r;
5443	<	for (MapReduceEntriesTask<K,V,U> t = this, s;;) {
5444	<	int c; BulkTask<K,V,?> par; U tr, sr;
5445	<	if ((c = t.pending) == 0) {
5446	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5447	<	if ((sr = s.result) != null)
5448	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5449	<	}
5450	<	if ((par = t.parent) == null ||
5451	<	!(par instanceof MapReduceEntriesTask)) {
5452	<	t.quietlyComplete();
5453	<	break;
5883	<	}
5884	<	t = (MapReduceEntriesTask<K,V,U>)par;
5443	>	CountedCompleter<?> c;
5444	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5445	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5446	>	t = (MapReduceEntriesTask<K,V,U>)c,
5447	>	s = t.rights;
5448	>	while (s != null) {
5449	>	U tr, sr;
5450	>	if ((sr = s.result) != null)
5451	>	t.result = (((tr = t.result) == null) ? sr :
5452	>	reducer.apply(tr, sr));
5453	>	s = t.rights = s.nextRight;
5454		}
5886	–	else if (t.casPending(c, c - 1))
5887	–	break;
5455		}
5889	–	} catch (Throwable ex) {
5890	–	return tryCompleteComputation(ex);
5891	–	}
5892	–	MapReduceEntriesTask<K,V,U> s = rights;
5893	–	if (s != null && !inForkJoinPool()) {
5894	–	do  {
5895	–	if (s.tryUnfork())
5896	–	s.exec();
5897	–	} while ((s = s.nextRight) != null);
5456		}
5899	–	return false;
5457		}
5901	–	public final U getRawResult() { return result; }
5458		}
5459
5460	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5460	>	@SuppressWarnings("serial")
5461	>	static final class MapReduceMappingsTask<K,V,U>
5462		extends BulkTask<K,V,U> {
5463		final BiFun<? super K, ? super V, ? extends U> transformer;
5464		final BiFun<? super U, ? super U, ? extends U> reducer;
5465		U result;
5466		MapReduceMappingsTask<K,V,U> rights, nextRight;
5467		MapReduceMappingsTask
5468	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5468	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5469		MapReduceMappingsTask<K,V,U> nextRight,
5470		BiFun<? super K, ? super V, ? extends U> transformer,
5471		BiFun<? super U, ? super U, ? extends U> reducer) {
5472	<	super(m, p, b); this.nextRight = nextRight;
5472	>	super(p, b, i, f, t); this.nextRight = nextRight;
5473		this.transformer = transformer;
5474		this.reducer = reducer;
5475		}
5476	<	@SuppressWarnings("unchecked") public final boolean exec() {
5477	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5478	<	this.transformer;
5479	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5480	<	this.reducer;
5481	<	if (transformer == null || reducer == null)
5482	<	return abortOnNullFunction();
5483	<	try {
5484	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5928	<	do {} while (!casPending(c = pending, c+1));
5476	>	public final U getRawResult() { return result; }
5477	>	public final void compute() {
5478	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5479	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5480	>	if ((transformer = this.transformer) != null &&
5481	>	(reducer = this.reducer) != null) {
5482	>	for (int i = baseIndex, f, h; batch > 0 &&
5483	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5484	>	addToPendingCount(1);
5485		(rights = new MapReduceMappingsTask<K,V,U>
5486	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5486	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5487	>	rights, transformer, reducer)).fork();
5488		}
5489	<	U r = null, u;
5490	<	Object v;
5491	<	while ((v = advance()) != null) {
5492	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5489	>	U r = null;
5490	>	for (Node<K,V> p; (p = advance()) != null; ) {
5491	>	U u;
5492	>	if ((u = transformer.apply(p.key, p.val)) != null)
5493		r = (r == null) ? u : reducer.apply(r, u);
5494		}
5495		result = r;
5496	<	for (MapReduceMappingsTask<K,V,U> t = this, s;;) {
5497	<	int c; BulkTask<K,V,?> par; U tr, sr;
5498	<	if ((c = t.pending) == 0) {
5499	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5500	<	if ((sr = s.result) != null)
5501	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5502	<	}
5503	<	if ((par = t.parent) == null ||
5504	<	!(par instanceof MapReduceMappingsTask)) {
5505	<	t.quietlyComplete();
5506	<	break;
5950	<	}
5951	<	t = (MapReduceMappingsTask<K,V,U>)par;
5496	>	CountedCompleter<?> c;
5497	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5498	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5499	>	t = (MapReduceMappingsTask<K,V,U>)c,
5500	>	s = t.rights;
5501	>	while (s != null) {
5502	>	U tr, sr;
5503	>	if ((sr = s.result) != null)
5504	>	t.result = (((tr = t.result) == null) ? sr :
5505	>	reducer.apply(tr, sr));
5506	>	s = t.rights = s.nextRight;
5507		}
5953	–	else if (t.casPending(c, c - 1))
5954	–	break;
5508		}
5956	–	} catch (Throwable ex) {
5957	–	return tryCompleteComputation(ex);
5958	–	}
5959	–	MapReduceMappingsTask<K,V,U> s = rights;
5960	–	if (s != null && !inForkJoinPool()) {
5961	–	do  {
5962	–	if (s.tryUnfork())
5963	–	s.exec();
5964	–	} while ((s = s.nextRight) != null);
5509		}
5966	–	return false;
5510		}
5968	–	public final U getRawResult() { return result; }
5511		}
5512
5513	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5513	>	@SuppressWarnings("serial")
5514	>	static final class MapReduceKeysToDoubleTask<K,V>
5515		extends BulkTask<K,V,Double> {
5516		final ObjectToDouble<? super K> transformer;
5517		final DoubleByDoubleToDouble reducer;
#	Line 5976 | Line 5519 | public class ConcurrentHashMapV8<K, V>
5519		double result;
5520		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5521		MapReduceKeysToDoubleTask
5522	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5522	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5523		MapReduceKeysToDoubleTask<K,V> nextRight,
5524		ObjectToDouble<? super K> transformer,
5525		double basis,
5526		DoubleByDoubleToDouble reducer) {
5527	<	super(m, p, b); this.nextRight = nextRight;
5527	>	super(p, b, i, f, t); this.nextRight = nextRight;
5528		this.transformer = transformer;
5529		this.basis = basis; this.reducer = reducer;
5530		}
5531	<	@SuppressWarnings("unchecked") public final boolean exec() {
5532	<	final ObjectToDouble<? super K> transformer =
5533	<	this.transformer;
5534	<	final DoubleByDoubleToDouble reducer = this.reducer;
5535	<	if (transformer == null || reducer == null)
5536	<	return abortOnNullFunction();
5537	<	try {
5538	<	final double id = this.basis;
5539	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5540	<	do {} while (!casPending(c = pending, c+1));
5531	>	public final Double getRawResult() { return result; }
5532	>	public final void compute() {
5533	>	final ObjectToDouble<? super K> transformer;
5534	>	final DoubleByDoubleToDouble reducer;
5535	>	if ((transformer = this.transformer) != null &&
5536	>	(reducer = this.reducer) != null) {
5537	>	double r = this.basis;
5538	>	for (int i = baseIndex, f, h; batch > 0 &&
5539	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5540	>	addToPendingCount(1);
5541		(rights = new MapReduceKeysToDoubleTask<K,V>
5542	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5542	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5543	>	rights, transformer, r, reducer)).fork();
5544		}
5545	<	double r = id;
5546	<	while (advance() != null)
6003	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5545	>	for (Node<K,V> p; (p = advance()) != null; )
5546	>	r = reducer.apply(r, transformer.apply(p.key));
5547		result = r;
5548	<	for (MapReduceKeysToDoubleTask<K,V> t = this, s;;) {
5549	<	int c; BulkTask<K,V,?> par;
5550	<	if ((c = t.pending) == 0) {
5551	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5552	<	t.result = reducer.apply(t.result, s.result);
5553	<	}
5554	<	if ((par = t.parent) == null ||
5555	<	!(par instanceof MapReduceKeysToDoubleTask)) {
6013	<	t.quietlyComplete();
6014	<	break;
6015	<	}
6016	<	t = (MapReduceKeysToDoubleTask<K,V>)par;
5548	>	CountedCompleter<?> c;
5549	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5550	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5551	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5552	>	s = t.rights;
5553	>	while (s != null) {
5554	>	t.result = reducer.apply(t.result, s.result);
5555	>	s = t.rights = s.nextRight;
5556		}
6018	–	else if (t.casPending(c, c - 1))
6019	–	break;
5557		}
6021	–	} catch (Throwable ex) {
6022	–	return tryCompleteComputation(ex);
5558		}
6024	–	MapReduceKeysToDoubleTask<K,V> s = rights;
6025	–	if (s != null && !inForkJoinPool()) {
6026	–	do  {
6027	–	if (s.tryUnfork())
6028	–	s.exec();
6029	–	} while ((s = s.nextRight) != null);
6030	–	}
6031	–	return false;
5559		}
6033	–	public final Double getRawResult() { return result; }
5560		}
5561
5562	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5562	>	@SuppressWarnings("serial")
5563	>	static final class MapReduceValuesToDoubleTask<K,V>
5564		extends BulkTask<K,V,Double> {
5565		final ObjectToDouble<? super V> transformer;
5566		final DoubleByDoubleToDouble reducer;
#	Line 6041 | Line 5568 | public class ConcurrentHashMapV8<K, V>
5568		double result;
5569		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5570		MapReduceValuesToDoubleTask
5571	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5571	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5572		MapReduceValuesToDoubleTask<K,V> nextRight,
5573		ObjectToDouble<? super V> transformer,
5574		double basis,
5575		DoubleByDoubleToDouble reducer) {
5576	<	super(m, p, b); this.nextRight = nextRight;
5576	>	super(p, b, i, f, t); this.nextRight = nextRight;
5577		this.transformer = transformer;
5578		this.basis = basis; this.reducer = reducer;
5579		}
5580	<	@SuppressWarnings("unchecked") public final boolean exec() {
5581	<	final ObjectToDouble<? super V> transformer =
5582	<	this.transformer;
5583	<	final DoubleByDoubleToDouble reducer = this.reducer;
5584	<	if (transformer == null || reducer == null)
5585	<	return abortOnNullFunction();
5586	<	try {
5587	<	final double id = this.basis;
5588	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5589	<	do {} while (!casPending(c = pending, c+1));
5580	>	public final Double getRawResult() { return result; }
5581	>	public final void compute() {
5582	>	final ObjectToDouble<? super V> transformer;
5583	>	final DoubleByDoubleToDouble reducer;
5584	>	if ((transformer = this.transformer) != null &&
5585	>	(reducer = this.reducer) != null) {
5586	>	double r = this.basis;
5587	>	for (int i = baseIndex, f, h; batch > 0 &&
5588	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5589	>	addToPendingCount(1);
5590		(rights = new MapReduceValuesToDoubleTask<K,V>
5591	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5591	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5592	>	rights, transformer, r, reducer)).fork();
5593		}
5594	<	double r = id;
5595	<	Object v;
6068	<	while ((v = advance()) != null)
6069	<	r = reducer.apply(r, transformer.apply((V)v));
5594	>	for (Node<K,V> p; (p = advance()) != null; )
5595	>	r = reducer.apply(r, transformer.apply(p.val));
5596		result = r;
5597	<	for (MapReduceValuesToDoubleTask<K,V> t = this, s;;) {
5598	<	int c; BulkTask<K,V,?> par;
5599	<	if ((c = t.pending) == 0) {
5600	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5601	<	t.result = reducer.apply(t.result, s.result);
5602	<	}
5603	<	if ((par = t.parent) == null ||
5604	<	!(par instanceof MapReduceValuesToDoubleTask)) {
6079	<	t.quietlyComplete();
6080	<	break;
6081	<	}
6082	<	t = (MapReduceValuesToDoubleTask<K,V>)par;
5597	>	CountedCompleter<?> c;
5598	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5599	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5600	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5601	>	s = t.rights;
5602	>	while (s != null) {
5603	>	t.result = reducer.apply(t.result, s.result);
5604	>	s = t.rights = s.nextRight;
5605		}
6084	–	else if (t.casPending(c, c - 1))
6085	–	break;
5606		}
6087	–	} catch (Throwable ex) {
6088	–	return tryCompleteComputation(ex);
6089	–	}
6090	–	MapReduceValuesToDoubleTask<K,V> s = rights;
6091	–	if (s != null && !inForkJoinPool()) {
6092	–	do  {
6093	–	if (s.tryUnfork())
6094	–	s.exec();
6095	–	} while ((s = s.nextRight) != null);
5607		}
6097	–	return false;
5608		}
6099	–	public final Double getRawResult() { return result; }
5609		}
5610
5611	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5611	>	@SuppressWarnings("serial")
5612	>	static final class MapReduceEntriesToDoubleTask<K,V>
5613		extends BulkTask<K,V,Double> {
5614		final ObjectToDouble<Map.Entry<K,V>> transformer;
5615		final DoubleByDoubleToDouble reducer;
#	Line 6107 | Line 5617 | public class ConcurrentHashMapV8<K, V>
5617		double result;
5618		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5619		MapReduceEntriesToDoubleTask
5620	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5620	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5621		MapReduceEntriesToDoubleTask<K,V> nextRight,
5622		ObjectToDouble<Map.Entry<K,V>> transformer,
5623		double basis,
5624		DoubleByDoubleToDouble reducer) {
5625	<	super(m, p, b); this.nextRight = nextRight;
5625	>	super(p, b, i, f, t); this.nextRight = nextRight;
5626		this.transformer = transformer;
5627		this.basis = basis; this.reducer = reducer;
5628		}
5629	<	@SuppressWarnings("unchecked") public final boolean exec() {
5630	<	final ObjectToDouble<Map.Entry<K,V>> transformer =
5631	<	this.transformer;
5632	<	final DoubleByDoubleToDouble reducer = this.reducer;
5633	<	if (transformer == null || reducer == null)
5634	<	return abortOnNullFunction();
5635	<	try {
5636	<	final double id = this.basis;
5637	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5638	<	do {} while (!casPending(c = pending, c+1));
5629	>	public final Double getRawResult() { return result; }
5630	>	public final void compute() {
5631	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
5632	>	final DoubleByDoubleToDouble reducer;
5633	>	if ((transformer = this.transformer) != null &&
5634	>	(reducer = this.reducer) != null) {
5635	>	double r = this.basis;
5636	>	for (int i = baseIndex, f, h; batch > 0 &&
5637	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5638	>	addToPendingCount(1);
5639		(rights = new MapReduceEntriesToDoubleTask<K,V>
5640	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5640	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5641	>	rights, transformer, r, reducer)).fork();
5642		}
5643	<	double r = id;
5644	<	Object v;
6134	<	while ((v = advance()) != null)
6135	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5643	>	for (Node<K,V> p; (p = advance()) != null; )
5644	>	r = reducer.apply(r, transformer.apply(p));
5645		result = r;
5646	<	for (MapReduceEntriesToDoubleTask<K,V> t = this, s;;) {
5647	<	int c; BulkTask<K,V,?> par;
5648	<	if ((c = t.pending) == 0) {
5649	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5650	<	t.result = reducer.apply(t.result, s.result);
5651	<	}
5652	<	if ((par = t.parent) == null ||
5653	<	!(par instanceof MapReduceEntriesToDoubleTask)) {
6145	<	t.quietlyComplete();
6146	<	break;
6147	<	}
6148	<	t = (MapReduceEntriesToDoubleTask<K,V>)par;
5646	>	CountedCompleter<?> c;
5647	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5648	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5649	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5650	>	s = t.rights;
5651	>	while (s != null) {
5652	>	t.result = reducer.apply(t.result, s.result);
5653	>	s = t.rights = s.nextRight;
5654		}
6150	–	else if (t.casPending(c, c - 1))
6151	–	break;
5655		}
6153	–	} catch (Throwable ex) {
6154	–	return tryCompleteComputation(ex);
6155	–	}
6156	–	MapReduceEntriesToDoubleTask<K,V> s = rights;
6157	–	if (s != null && !inForkJoinPool()) {
6158	–	do  {
6159	–	if (s.tryUnfork())
6160	–	s.exec();
6161	–	} while ((s = s.nextRight) != null);
5656		}
6163	–	return false;
5657		}
6165	–	public final Double getRawResult() { return result; }
5658		}
5659
5660	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5660	>	@SuppressWarnings("serial")
5661	>	static final class MapReduceMappingsToDoubleTask<K,V>
5662		extends BulkTask<K,V,Double> {
5663		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5664		final DoubleByDoubleToDouble reducer;
#	Line 6173 | Line 5666 | public class ConcurrentHashMapV8<K, V>
5666		double result;
5667		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5668		MapReduceMappingsToDoubleTask
5669	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5669	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5670		MapReduceMappingsToDoubleTask<K,V> nextRight,
5671		ObjectByObjectToDouble<? super K, ? super V> transformer,
5672		double basis,
5673		DoubleByDoubleToDouble reducer) {
5674	<	super(m, p, b); this.nextRight = nextRight;
5674	>	super(p, b, i, f, t); this.nextRight = nextRight;
5675		this.transformer = transformer;
5676		this.basis = basis; this.reducer = reducer;
5677		}
5678	<	@SuppressWarnings("unchecked") public final boolean exec() {
5679	<	final ObjectByObjectToDouble<? super K, ? super V> transformer =
5680	<	this.transformer;
5681	<	final DoubleByDoubleToDouble reducer = this.reducer;
5682	<	if (transformer == null || reducer == null)
5683	<	return abortOnNullFunction();
5684	<	try {
5685	<	final double id = this.basis;
5686	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5687	<	do {} while (!casPending(c = pending, c+1));
5678	>	public final Double getRawResult() { return result; }
5679	>	public final void compute() {
5680	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5681	>	final DoubleByDoubleToDouble reducer;
5682	>	if ((transformer = this.transformer) != null &&
5683	>	(reducer = this.reducer) != null) {
5684	>	double r = this.basis;
5685	>	for (int i = baseIndex, f, h; batch > 0 &&
5686	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5687	>	addToPendingCount(1);
5688		(rights = new MapReduceMappingsToDoubleTask<K,V>
5689	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5689	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5690	>	rights, transformer, r, reducer)).fork();
5691		}
5692	<	double r = id;
5693	<	Object v;
6200	<	while ((v = advance()) != null)
6201	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5692	>	for (Node<K,V> p; (p = advance()) != null; )
5693	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5694		result = r;
5695	<	for (MapReduceMappingsToDoubleTask<K,V> t = this, s;;) {
5696	<	int c; BulkTask<K,V,?> par;
5697	<	if ((c = t.pending) == 0) {
5698	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5699	<	t.result = reducer.apply(t.result, s.result);
5700	<	}
5701	<	if ((par = t.parent) == null ||
5702	<	!(par instanceof MapReduceMappingsToDoubleTask)) {
6211	<	t.quietlyComplete();
6212	<	break;
6213	<	}
6214	<	t = (MapReduceMappingsToDoubleTask<K,V>)par;
5695	>	CountedCompleter<?> c;
5696	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5697	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5698	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5699	>	s = t.rights;
5700	>	while (s != null) {
5701	>	t.result = reducer.apply(t.result, s.result);
5702	>	s = t.rights = s.nextRight;
5703		}
6216	–	else if (t.casPending(c, c - 1))
6217	–	break;
5704		}
6219	–	} catch (Throwable ex) {
6220	–	return tryCompleteComputation(ex);
5705		}
6222	–	MapReduceMappingsToDoubleTask<K,V> s = rights;
6223	–	if (s != null && !inForkJoinPool()) {
6224	–	do  {
6225	–	if (s.tryUnfork())
6226	–	s.exec();
6227	–	} while ((s = s.nextRight) != null);
6228	–	}
6229	–	return false;
5706		}
6231	–	public final Double getRawResult() { return result; }
5707		}
5708
5709	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5709	>	@SuppressWarnings("serial")
5710	>	static final class MapReduceKeysToLongTask<K,V>
5711		extends BulkTask<K,V,Long> {
5712		final ObjectToLong<? super K> transformer;
5713		final LongByLongToLong reducer;
#	Line 6239 | Line 5715 | public class ConcurrentHashMapV8<K, V>
5715		long result;
5716		MapReduceKeysToLongTask<K,V> rights, nextRight;
5717		MapReduceKeysToLongTask
5718	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5718	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5719		MapReduceKeysToLongTask<K,V> nextRight,
5720		ObjectToLong<? super K> transformer,
5721		long basis,
5722		LongByLongToLong reducer) {
5723	<	super(m, p, b); this.nextRight = nextRight;
5723	>	super(p, b, i, f, t); this.nextRight = nextRight;
5724		this.transformer = transformer;
5725		this.basis = basis; this.reducer = reducer;
5726		}
5727	<	@SuppressWarnings("unchecked") public final boolean exec() {
5728	<	final ObjectToLong<? super K> transformer =
5729	<	this.transformer;
5730	<	final LongByLongToLong reducer = this.reducer;
5731	<	if (transformer == null || reducer == null)
5732	<	return abortOnNullFunction();
5733	<	try {
5734	<	final long id = this.basis;
5735	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5736	<	do {} while (!casPending(c = pending, c+1));
5727	>	public final Long getRawResult() { return result; }
5728	>	public final void compute() {
5729	>	final ObjectToLong<? super K> transformer;
5730	>	final LongByLongToLong reducer;
5731	>	if ((transformer = this.transformer) != null &&
5732	>	(reducer = this.reducer) != null) {
5733	>	long r = this.basis;
5734	>	for (int i = baseIndex, f, h; batch > 0 &&
5735	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5736	>	addToPendingCount(1);
5737		(rights = new MapReduceKeysToLongTask<K,V>
5738	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5738	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5739	>	rights, transformer, r, reducer)).fork();
5740		}
5741	<	long r = id;
5742	<	while (advance() != null)
6266	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5741	>	for (Node<K,V> p; (p = advance()) != null; )
5742	>	r = reducer.apply(r, transformer.apply(p.key));
5743		result = r;
5744	<	for (MapReduceKeysToLongTask<K,V> t = this, s;;) {
5745	<	int c; BulkTask<K,V,?> par;
5746	<	if ((c = t.pending) == 0) {
5747	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5748	<	t.result = reducer.apply(t.result, s.result);
5749	<	}
5750	<	if ((par = t.parent) == null ||
5751	<	!(par instanceof MapReduceKeysToLongTask)) {
6276	<	t.quietlyComplete();
6277	<	break;
6278	<	}
6279	<	t = (MapReduceKeysToLongTask<K,V>)par;
5744	>	CountedCompleter<?> c;
5745	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5746	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5747	>	t = (MapReduceKeysToLongTask<K,V>)c,
5748	>	s = t.rights;
5749	>	while (s != null) {
5750	>	t.result = reducer.apply(t.result, s.result);
5751	>	s = t.rights = s.nextRight;
5752		}
6281	–	else if (t.casPending(c, c - 1))
6282	–	break;
5753		}
6284	–	} catch (Throwable ex) {
6285	–	return tryCompleteComputation(ex);
5754		}
6287	–	MapReduceKeysToLongTask<K,V> s = rights;
6288	–	if (s != null && !inForkJoinPool()) {
6289	–	do  {
6290	–	if (s.tryUnfork())
6291	–	s.exec();
6292	–	} while ((s = s.nextRight) != null);
6293	–	}
6294	–	return false;
5755		}
6296	–	public final Long getRawResult() { return result; }
5756		}
5757
5758	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5758	>	@SuppressWarnings("serial")
5759	>	static final class MapReduceValuesToLongTask<K,V>
5760		extends BulkTask<K,V,Long> {
5761		final ObjectToLong<? super V> transformer;
5762		final LongByLongToLong reducer;
#	Line 6304 | Line 5764 | public class ConcurrentHashMapV8<K, V>
5764		long result;
5765		MapReduceValuesToLongTask<K,V> rights, nextRight;
5766		MapReduceValuesToLongTask
5767	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5767	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5768		MapReduceValuesToLongTask<K,V> nextRight,
5769		ObjectToLong<? super V> transformer,
5770		long basis,
5771		LongByLongToLong reducer) {
5772	<	super(m, p, b); this.nextRight = nextRight;
5772	>	super(p, b, i, f, t); this.nextRight = nextRight;
5773		this.transformer = transformer;
5774		this.basis = basis; this.reducer = reducer;
5775		}
5776	<	@SuppressWarnings("unchecked") public final boolean exec() {
5777	<	final ObjectToLong<? super V> transformer =
5778	<	this.transformer;
5779	<	final LongByLongToLong reducer = this.reducer;
5780	<	if (transformer == null || reducer == null)
5781	<	return abortOnNullFunction();
5782	<	try {
5783	<	final long id = this.basis;
5784	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5785	<	do {} while (!casPending(c = pending, c+1));
5776	>	public final Long getRawResult() { return result; }
5777	>	public final void compute() {
5778	>	final ObjectToLong<? super V> transformer;
5779	>	final LongByLongToLong reducer;
5780	>	if ((transformer = this.transformer) != null &&
5781	>	(reducer = this.reducer) != null) {
5782	>	long r = this.basis;
5783	>	for (int i = baseIndex, f, h; batch > 0 &&
5784	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5785	>	addToPendingCount(1);
5786		(rights = new MapReduceValuesToLongTask<K,V>
5787	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5787	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5788	>	rights, transformer, r, reducer)).fork();
5789		}
5790	<	long r = id;
5791	<	Object v;
6331	<	while ((v = advance()) != null)
6332	<	r = reducer.apply(r, transformer.apply((V)v));
5790	>	for (Node<K,V> p; (p = advance()) != null; )
5791	>	r = reducer.apply(r, transformer.apply(p.val));
5792		result = r;
5793	<	for (MapReduceValuesToLongTask<K,V> t = this, s;;) {
5794	<	int c; BulkTask<K,V,?> par;
5795	<	if ((c = t.pending) == 0) {
5796	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5797	<	t.result = reducer.apply(t.result, s.result);
5798	<	}
5799	<	if ((par = t.parent) == null ||
5800	<	!(par instanceof MapReduceValuesToLongTask)) {
6342	<	t.quietlyComplete();
6343	<	break;
6344	<	}
6345	<	t = (MapReduceValuesToLongTask<K,V>)par;
5793	>	CountedCompleter<?> c;
5794	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5795	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5796	>	t = (MapReduceValuesToLongTask<K,V>)c,
5797	>	s = t.rights;
5798	>	while (s != null) {
5799	>	t.result = reducer.apply(t.result, s.result);
5800	>	s = t.rights = s.nextRight;
5801		}
6347	–	else if (t.casPending(c, c - 1))
6348	–	break;
5802		}
6350	–	} catch (Throwable ex) {
6351	–	return tryCompleteComputation(ex);
6352	–	}
6353	–	MapReduceValuesToLongTask<K,V> s = rights;
6354	–	if (s != null && !inForkJoinPool()) {
6355	–	do  {
6356	–	if (s.tryUnfork())
6357	–	s.exec();
6358	–	} while ((s = s.nextRight) != null);
5803		}
6360	–	return false;
5804		}
6362	–	public final Long getRawResult() { return result; }
5805		}
5806
5807	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5807	>	@SuppressWarnings("serial")
5808	>	static final class MapReduceEntriesToLongTask<K,V>
5809		extends BulkTask<K,V,Long> {
5810		final ObjectToLong<Map.Entry<K,V>> transformer;
5811		final LongByLongToLong reducer;
#	Line 6370 | Line 5813 | public class ConcurrentHashMapV8<K, V>
5813		long result;
5814		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5815		MapReduceEntriesToLongTask
5816	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5816	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5817		MapReduceEntriesToLongTask<K,V> nextRight,
5818		ObjectToLong<Map.Entry<K,V>> transformer,
5819		long basis,
5820		LongByLongToLong reducer) {
5821	<	super(m, p, b); this.nextRight = nextRight;
5821	>	super(p, b, i, f, t); this.nextRight = nextRight;
5822		this.transformer = transformer;
5823		this.basis = basis; this.reducer = reducer;
5824		}
5825	<	@SuppressWarnings("unchecked") public final boolean exec() {
5826	<	final ObjectToLong<Map.Entry<K,V>> transformer =
5827	<	this.transformer;
5828	<	final LongByLongToLong reducer = this.reducer;
5829	<	if (transformer == null || reducer == null)
5830	<	return abortOnNullFunction();
5831	<	try {
5832	<	final long id = this.basis;
5833	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5834	<	do {} while (!casPending(c = pending, c+1));
5825	>	public final Long getRawResult() { return result; }
5826	>	public final void compute() {
5827	>	final ObjectToLong<Map.Entry<K,V>> transformer;
5828	>	final LongByLongToLong reducer;
5829	>	if ((transformer = this.transformer) != null &&
5830	>	(reducer = this.reducer) != null) {
5831	>	long r = this.basis;
5832	>	for (int i = baseIndex, f, h; batch > 0 &&
5833	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5834	>	addToPendingCount(1);
5835		(rights = new MapReduceEntriesToLongTask<K,V>
5836	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5836	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5837	>	rights, transformer, r, reducer)).fork();
5838		}
5839	<	long r = id;
5840	<	Object v;
6397	<	while ((v = advance()) != null)
6398	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5839	>	for (Node<K,V> p; (p = advance()) != null; )
5840	>	r = reducer.apply(r, transformer.apply(p));
5841		result = r;
5842	<	for (MapReduceEntriesToLongTask<K,V> t = this, s;;) {
5843	<	int c; BulkTask<K,V,?> par;
5844	<	if ((c = t.pending) == 0) {
5845	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5846	<	t.result = reducer.apply(t.result, s.result);
5847	<	}
5848	<	if ((par = t.parent) == null ||
5849	<	!(par instanceof MapReduceEntriesToLongTask)) {
6408	<	t.quietlyComplete();
6409	<	break;
6410	<	}
6411	<	t = (MapReduceEntriesToLongTask<K,V>)par;
5842	>	CountedCompleter<?> c;
5843	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5844	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5845	>	t = (MapReduceEntriesToLongTask<K,V>)c,
5846	>	s = t.rights;
5847	>	while (s != null) {
5848	>	t.result = reducer.apply(t.result, s.result);
5849	>	s = t.rights = s.nextRight;
5850		}
6413	–	else if (t.casPending(c, c - 1))
6414	–	break;
5851		}
6416	–	} catch (Throwable ex) {
6417	–	return tryCompleteComputation(ex);
6418	–	}
6419	–	MapReduceEntriesToLongTask<K,V> s = rights;
6420	–	if (s != null && !inForkJoinPool()) {
6421	–	do  {
6422	–	if (s.tryUnfork())
6423	–	s.exec();
6424	–	} while ((s = s.nextRight) != null);
5852		}
6426	–	return false;
5853		}
6428	–	public final Long getRawResult() { return result; }
5854		}
5855
5856	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5856	>	@SuppressWarnings("serial")
5857	>	static final class MapReduceMappingsToLongTask<K,V>
5858		extends BulkTask<K,V,Long> {
5859		final ObjectByObjectToLong<? super K, ? super V> transformer;
5860		final LongByLongToLong reducer;
#	Line 6436 | Line 5862 | public class ConcurrentHashMapV8<K, V>
5862		long result;
5863		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5864		MapReduceMappingsToLongTask
5865	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5865	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5866		MapReduceMappingsToLongTask<K,V> nextRight,
5867		ObjectByObjectToLong<? super K, ? super V> transformer,
5868		long basis,
5869		LongByLongToLong reducer) {
5870	<	super(m, p, b); this.nextRight = nextRight;
5870	>	super(p, b, i, f, t); this.nextRight = nextRight;
5871		this.transformer = transformer;
5872		this.basis = basis; this.reducer = reducer;
5873		}
5874	<	@SuppressWarnings("unchecked") public final boolean exec() {
5875	<	final ObjectByObjectToLong<? super K, ? super V> transformer =
5876	<	this.transformer;
5877	<	final LongByLongToLong reducer = this.reducer;
5878	<	if (transformer == null || reducer == null)
5879	<	return abortOnNullFunction();
5880	<	try {
5881	<	final long id = this.basis;
5882	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5883	<	do {} while (!casPending(c = pending, c+1));
5874	>	public final Long getRawResult() { return result; }
5875	>	public final void compute() {
5876	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
5877	>	final LongByLongToLong reducer;
5878	>	if ((transformer = this.transformer) != null &&
5879	>	(reducer = this.reducer) != null) {
5880	>	long r = this.basis;
5881	>	for (int i = baseIndex, f, h; batch > 0 &&
5882	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5883	>	addToPendingCount(1);
5884		(rights = new MapReduceMappingsToLongTask<K,V>
5885	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5885	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5886	>	rights, transformer, r, reducer)).fork();
5887		}
5888	<	long r = id;
5889	<	Object v;
6463	<	while ((v = advance()) != null)
6464	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5888	>	for (Node<K,V> p; (p = advance()) != null; )
5889	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5890		result = r;
5891	<	for (MapReduceMappingsToLongTask<K,V> t = this, s;;) {
5892	<	int c; BulkTask<K,V,?> par;
5893	<	if ((c = t.pending) == 0) {
5894	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5895	<	t.result = reducer.apply(t.result, s.result);
5896	<	}
5897	<	if ((par = t.parent) == null ||
5898	<	!(par instanceof MapReduceMappingsToLongTask)) {
6474	<	t.quietlyComplete();
6475	<	break;
6476	<	}
6477	<	t = (MapReduceMappingsToLongTask<K,V>)par;
5891	>	CountedCompleter<?> c;
5892	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5893	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5894	>	t = (MapReduceMappingsToLongTask<K,V>)c,
5895	>	s = t.rights;
5896	>	while (s != null) {
5897	>	t.result = reducer.apply(t.result, s.result);
5898	>	s = t.rights = s.nextRight;
5899		}
6479	–	else if (t.casPending(c, c - 1))
6480	–	break;
5900		}
6482	–	} catch (Throwable ex) {
6483	–	return tryCompleteComputation(ex);
5901		}
6485	–	MapReduceMappingsToLongTask<K,V> s = rights;
6486	–	if (s != null && !inForkJoinPool()) {
6487	–	do  {
6488	–	if (s.tryUnfork())
6489	–	s.exec();
6490	–	} while ((s = s.nextRight) != null);
6491	–	}
6492	–	return false;
5902		}
6494	–	public final Long getRawResult() { return result; }
5903		}
5904
5905	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5905	>	@SuppressWarnings("serial")
5906	>	static final class MapReduceKeysToIntTask<K,V>
5907		extends BulkTask<K,V,Integer> {
5908		final ObjectToInt<? super K> transformer;
5909		final IntByIntToInt reducer;
#	Line 6502 | Line 5911 | public class ConcurrentHashMapV8<K, V>
5911		int result;
5912		MapReduceKeysToIntTask<K,V> rights, nextRight;
5913		MapReduceKeysToIntTask
5914	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5914	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5915		MapReduceKeysToIntTask<K,V> nextRight,
5916		ObjectToInt<? super K> transformer,
5917		int basis,
5918		IntByIntToInt reducer) {
5919	<	super(m, p, b); this.nextRight = nextRight;
5919	>	super(p, b, i, f, t); this.nextRight = nextRight;
5920		this.transformer = transformer;
5921		this.basis = basis; this.reducer = reducer;
5922		}
5923	<	@SuppressWarnings("unchecked") public final boolean exec() {
5924	<	final ObjectToInt<? super K> transformer =
5925	<	this.transformer;
5926	<	final IntByIntToInt reducer = this.reducer;
5927	<	if (transformer == null || reducer == null)
5928	<	return abortOnNullFunction();
5929	<	try {
5930	<	final int id = this.basis;
5931	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5932	<	do {} while (!casPending(c = pending, c+1));
5923	>	public final Integer getRawResult() { return result; }
5924	>	public final void compute() {
5925	>	final ObjectToInt<? super K> transformer;
5926	>	final IntByIntToInt reducer;
5927	>	if ((transformer = this.transformer) != null &&
5928	>	(reducer = this.reducer) != null) {
5929	>	int r = this.basis;
5930	>	for (int i = baseIndex, f, h; batch > 0 &&
5931	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5932	>	addToPendingCount(1);
5933		(rights = new MapReduceKeysToIntTask<K,V>
5934	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5934	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5935	>	rights, transformer, r, reducer)).fork();
5936		}
5937	<	int r = id;
5938	<	while (advance() != null)
6529	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5937	>	for (Node<K,V> p; (p = advance()) != null; )
5938	>	r = reducer.apply(r, transformer.apply(p.key));
5939		result = r;
5940	<	for (MapReduceKeysToIntTask<K,V> t = this, s;;) {
5941	<	int c; BulkTask<K,V,?> par;
5942	<	if ((c = t.pending) == 0) {
5943	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5944	<	t.result = reducer.apply(t.result, s.result);
5945	<	}
5946	<	if ((par = t.parent) == null ||
5947	<	!(par instanceof MapReduceKeysToIntTask)) {
6539	<	t.quietlyComplete();
6540	<	break;
6541	<	}
6542	<	t = (MapReduceKeysToIntTask<K,V>)par;
5940	>	CountedCompleter<?> c;
5941	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5942	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5943	>	t = (MapReduceKeysToIntTask<K,V>)c,
5944	>	s = t.rights;
5945	>	while (s != null) {
5946	>	t.result = reducer.apply(t.result, s.result);
5947	>	s = t.rights = s.nextRight;
5948		}
6544	–	else if (t.casPending(c, c - 1))
6545	–	break;
5949		}
6547	–	} catch (Throwable ex) {
6548	–	return tryCompleteComputation(ex);
5950		}
6550	–	MapReduceKeysToIntTask<K,V> s = rights;
6551	–	if (s != null && !inForkJoinPool()) {
6552	–	do  {
6553	–	if (s.tryUnfork())
6554	–	s.exec();
6555	–	} while ((s = s.nextRight) != null);
6556	–	}
6557	–	return false;
5951		}
6559	–	public final Integer getRawResult() { return result; }
5952		}
5953
5954	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5954	>	@SuppressWarnings("serial")
5955	>	static final class MapReduceValuesToIntTask<K,V>
5956		extends BulkTask<K,V,Integer> {
5957		final ObjectToInt<? super V> transformer;
5958		final IntByIntToInt reducer;
#	Line 6567 | Line 5960 | public class ConcurrentHashMapV8<K, V>
5960		int result;
5961		MapReduceValuesToIntTask<K,V> rights, nextRight;
5962		MapReduceValuesToIntTask
5963	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5963	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5964		MapReduceValuesToIntTask<K,V> nextRight,
5965		ObjectToInt<? super V> transformer,
5966		int basis,
5967		IntByIntToInt reducer) {
5968	<	super(m, p, b); this.nextRight = nextRight;
5968	>	super(p, b, i, f, t); this.nextRight = nextRight;
5969		this.transformer = transformer;
5970		this.basis = basis; this.reducer = reducer;
5971		}
5972	<	@SuppressWarnings("unchecked") public final boolean exec() {
5973	<	final ObjectToInt<? super V> transformer =
5974	<	this.transformer;
5975	<	final IntByIntToInt reducer = this.reducer;
5976	<	if (transformer == null || reducer == null)
5977	<	return abortOnNullFunction();
5978	<	try {
5979	<	final int id = this.basis;
5980	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5981	<	do {} while (!casPending(c = pending, c+1));
5972	>	public final Integer getRawResult() { return result; }
5973	>	public final void compute() {
5974	>	final ObjectToInt<? super V> transformer;
5975	>	final IntByIntToInt reducer;
5976	>	if ((transformer = this.transformer) != null &&
5977	>	(reducer = this.reducer) != null) {
5978	>	int r = this.basis;
5979	>	for (int i = baseIndex, f, h; batch > 0 &&
5980	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5981	>	addToPendingCount(1);
5982		(rights = new MapReduceValuesToIntTask<K,V>
5983	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5983	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5984	>	rights, transformer, r, reducer)).fork();
5985		}
5986	<	int r = id;
5987	<	Object v;
6594	<	while ((v = advance()) != null)
6595	<	r = reducer.apply(r, transformer.apply((V)v));
5986	>	for (Node<K,V> p; (p = advance()) != null; )
5987	>	r = reducer.apply(r, transformer.apply(p.val));
5988		result = r;
5989	<	for (MapReduceValuesToIntTask<K,V> t = this, s;;) {
5990	<	int c; BulkTask<K,V,?> par;
5991	<	if ((c = t.pending) == 0) {
5992	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5993	<	t.result = reducer.apply(t.result, s.result);
5994	<	}
5995	<	if ((par = t.parent) == null ||
5996	<	!(par instanceof MapReduceValuesToIntTask)) {
6605	<	t.quietlyComplete();
6606	<	break;
6607	<	}
6608	<	t = (MapReduceValuesToIntTask<K,V>)par;
5989	>	CountedCompleter<?> c;
5990	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5991	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5992	>	t = (MapReduceValuesToIntTask<K,V>)c,
5993	>	s = t.rights;
5994	>	while (s != null) {
5995	>	t.result = reducer.apply(t.result, s.result);
5996	>	s = t.rights = s.nextRight;
5997		}
6610	–	else if (t.casPending(c, c - 1))
6611	–	break;
5998		}
6613	–	} catch (Throwable ex) {
6614	–	return tryCompleteComputation(ex);
5999		}
6616	–	MapReduceValuesToIntTask<K,V> s = rights;
6617	–	if (s != null && !inForkJoinPool()) {
6618	–	do  {
6619	–	if (s.tryUnfork())
6620	–	s.exec();
6621	–	} while ((s = s.nextRight) != null);
6622	–	}
6623	–	return false;
6000		}
6625	–	public final Integer getRawResult() { return result; }
6001		}
6002
6003	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
6003	>	@SuppressWarnings("serial")
6004	>	static final class MapReduceEntriesToIntTask<K,V>
6005		extends BulkTask<K,V,Integer> {
6006		final ObjectToInt<Map.Entry<K,V>> transformer;
6007		final IntByIntToInt reducer;
#	Line 6633 | Line 6009 | public class ConcurrentHashMapV8<K, V>
6009		int result;
6010		MapReduceEntriesToIntTask<K,V> rights, nextRight;
6011		MapReduceEntriesToIntTask
6012	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
6012	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6013		MapReduceEntriesToIntTask<K,V> nextRight,
6014		ObjectToInt<Map.Entry<K,V>> transformer,
6015		int basis,
6016		IntByIntToInt reducer) {
6017	<	super(m, p, b); this.nextRight = nextRight;
6017	>	super(p, b, i, f, t); this.nextRight = nextRight;
6018		this.transformer = transformer;
6019		this.basis = basis; this.reducer = reducer;
6020		}
6021	<	@SuppressWarnings("unchecked") public final boolean exec() {
6022	<	final ObjectToInt<Map.Entry<K,V>> transformer =
6023	<	this.transformer;
6024	<	final IntByIntToInt reducer = this.reducer;
6025	<	if (transformer == null || reducer == null)
6026	<	return abortOnNullFunction();
6027	<	try {
6028	<	final int id = this.basis;
6029	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6030	<	do {} while (!casPending(c = pending, c+1));
6021	>	public final Integer getRawResult() { return result; }
6022	>	public final void compute() {
6023	>	final ObjectToInt<Map.Entry<K,V>> transformer;
6024	>	final IntByIntToInt reducer;
6025	>	if ((transformer = this.transformer) != null &&
6026	>	(reducer = this.reducer) != null) {
6027	>	int r = this.basis;
6028	>	for (int i = baseIndex, f, h; batch > 0 &&
6029	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6030	>	addToPendingCount(1);
6031		(rights = new MapReduceEntriesToIntTask<K,V>
6032	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6032	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6033	>	rights, transformer, r, reducer)).fork();
6034		}
6035	<	int r = id;
6036	<	Object v;
6660	<	while ((v = advance()) != null)
6661	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
6035	>	for (Node<K,V> p; (p = advance()) != null; )
6036	>	r = reducer.apply(r, transformer.apply(p));
6037		result = r;
6038	<	for (MapReduceEntriesToIntTask<K,V> t = this, s;;) {
6039	<	int c; BulkTask<K,V,?> par;
6040	<	if ((c = t.pending) == 0) {
6041	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6042	<	t.result = reducer.apply(t.result, s.result);
6043	<	}
6044	<	if ((par = t.parent) == null ||
6045	<	!(par instanceof MapReduceEntriesToIntTask)) {
6671	<	t.quietlyComplete();
6672	<	break;
6673	<	}
6674	<	t = (MapReduceEntriesToIntTask<K,V>)par;
6038	>	CountedCompleter<?> c;
6039	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6040	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
6041	>	t = (MapReduceEntriesToIntTask<K,V>)c,
6042	>	s = t.rights;
6043	>	while (s != null) {
6044	>	t.result = reducer.apply(t.result, s.result);
6045	>	s = t.rights = s.nextRight;
6046		}
6676	–	else if (t.casPending(c, c - 1))
6677	–	break;
6047		}
6679	–	} catch (Throwable ex) {
6680	–	return tryCompleteComputation(ex);
6681	–	}
6682	–	MapReduceEntriesToIntTask<K,V> s = rights;
6683	–	if (s != null && !inForkJoinPool()) {
6684	–	do  {
6685	–	if (s.tryUnfork())
6686	–	s.exec();
6687	–	} while ((s = s.nextRight) != null);
6048		}
6689	–	return false;
6049		}
6691	–	public final Integer getRawResult() { return result; }
6050		}
6051
6052	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
6052	>	@SuppressWarnings("serial")
6053	>	static final class MapReduceMappingsToIntTask<K,V>
6054		extends BulkTask<K,V,Integer> {
6055		final ObjectByObjectToInt<? super K, ? super V> transformer;
6056		final IntByIntToInt reducer;
#	Line 6699 | Line 6058 | public class ConcurrentHashMapV8<K, V>
6058		int result;
6059		MapReduceMappingsToIntTask<K,V> rights, nextRight;
6060		MapReduceMappingsToIntTask
6061	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
6062	<	MapReduceMappingsToIntTask<K,V> rights,
6061	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6062	>	MapReduceMappingsToIntTask<K,V> nextRight,
6063		ObjectByObjectToInt<? super K, ? super V> transformer,
6064		int basis,
6065		IntByIntToInt reducer) {
6066	<	super(m, p, b); this.nextRight = nextRight;
6066	>	super(p, b, i, f, t); this.nextRight = nextRight;
6067		this.transformer = transformer;
6068		this.basis = basis; this.reducer = reducer;
6069		}
6070	<	@SuppressWarnings("unchecked") public final boolean exec() {
6071	<	final ObjectByObjectToInt<? super K, ? super V> transformer =
6072	<	this.transformer;
6073	<	final IntByIntToInt reducer = this.reducer;
6074	<	if (transformer == null || reducer == null)
6075	<	return abortOnNullFunction();
6076	<	try {
6077	<	final int id = this.basis;
6078	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6079	<	do {} while (!casPending(c = pending, c+1));
6070	>	public final Integer getRawResult() { return result; }
6071	>	public final void compute() {
6072	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
6073	>	final IntByIntToInt reducer;
6074	>	if ((transformer = this.transformer) != null &&
6075	>	(reducer = this.reducer) != null) {
6076	>	int r = this.basis;
6077	>	for (int i = baseIndex, f, h; batch > 0 &&
6078	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6079	>	addToPendingCount(1);
6080		(rights = new MapReduceMappingsToIntTask<K,V>
6081	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6081	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6082	>	rights, transformer, r, reducer)).fork();
6083		}
6084	<	int r = id;
6085	<	Object v;
6726	<	while ((v = advance()) != null)
6727	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
6084	>	for (Node<K,V> p; (p = advance()) != null; )
6085	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
6086		result = r;
6087	<	for (MapReduceMappingsToIntTask<K,V> t = this, s;;) {
6088	<	int c; BulkTask<K,V,?> par;
6089	<	if ((c = t.pending) == 0) {
6090	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6091	<	t.result = reducer.apply(t.result, s.result);
6092	<	}
6093	<	if ((par = t.parent) == null ||
6094	<	!(par instanceof MapReduceMappingsToIntTask)) {
6737	<	t.quietlyComplete();
6738	<	break;
6739	<	}
6740	<	t = (MapReduceMappingsToIntTask<K,V>)par;
6087	>	CountedCompleter<?> c;
6088	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6089	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
6090	>	t = (MapReduceMappingsToIntTask<K,V>)c,
6091	>	s = t.rights;
6092	>	while (s != null) {
6093	>	t.result = reducer.apply(t.result, s.result);
6094	>	s = t.rights = s.nextRight;
6095		}
6742	–	else if (t.casPending(c, c - 1))
6743	–	break;
6096		}
6745	–	} catch (Throwable ex) {
6746	–	return tryCompleteComputation(ex);
6097		}
6098	<	MapReduceMappingsToIntTask<K,V> s = rights;
6099	<	if (s != null && !inForkJoinPool()) {
6100	<	do  {
6101	<	if (s.tryUnfork())
6102	<	s.exec();
6103	<	} while ((s = s.nextRight) != null);
6098	>	}
6099	>	}
6100	>
6101	>	/* ---------------- Counters -------------- */
6102	>
6103	>	// Adapted from LongAdder and Striped64.
6104	>	// See their internal docs for explanation.
6105	>
6106	>	// A padded cell for distributing counts
6107	>	static final class CounterCell {
6108	>	volatile long p0, p1, p2, p3, p4, p5, p6;
6109	>	volatile long value;
6110	>	volatile long q0, q1, q2, q3, q4, q5, q6;
6111	>	CounterCell(long x) { value = x; }
6112	>	}
6113	>
6114	>	/**
6115	>	* Holder for the thread-local hash code determining which
6116	>	* CounterCell to use. The code is initialized via the
6117	>	* counterHashCodeGenerator, but may be moved upon collisions.
6118	>	*/
6119	>	static final class CounterHashCode {
6120	>	int code;
6121	>	}
6122	>
6123	>	/**
6124	>	* Generates initial value for per-thread CounterHashCodes.
6125	>	*/
6126	>	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
6127	>
6128	>	/**
6129	>	* Increment for counterHashCodeGenerator. See class ThreadLocal
6130	>	* for explanation.
6131	>	*/
6132	>	static final int SEED_INCREMENT = 0x61c88647;
6133	>
6134	>	/**
6135	>	* Per-thread counter hash codes. Shared across all instances.
6136	>	*/
6137	>	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
6138	>	new ThreadLocal<CounterHashCode>();
6139	>
6140	>
6141	>	final long sumCount() {
6142	>	CounterCell[] as = counterCells; CounterCell a;
6143	>	long sum = baseCount;
6144	>	if (as != null) {
6145	>	for (int i = 0; i < as.length; ++i) {
6146	>	if ((a = as[i]) != null)
6147	>	sum += a.value;
6148		}
6755	–	return false;
6149		}
6150	<	public final Integer getRawResult() { return result; }
6150	>	return sum;
6151		}
6152
6153	+	// See LongAdder version for explanation
6154	+	private final void fullAddCount(long x, CounterHashCode hc,
6155	+	boolean wasUncontended) {
6156	+	int h;
6157	+	if (hc == null) {
6158	+	hc = new CounterHashCode();
6159	+	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
6160	+	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
6161	+	threadCounterHashCode.set(hc);
6162	+	}
6163	+	else
6164	+	h = hc.code;
6165	+	boolean collide = false;                // True if last slot nonempty
6166	+	for (;;) {
6167	+	CounterCell[] as; CounterCell a; int n; long v;
6168	+	if ((as = counterCells) != null && (n = as.length) > 0) {
6169	+	if ((a = as[(n - 1) & h]) == null) {
6170	+	if (cellsBusy == 0) {            // Try to attach new Cell
6171	+	CounterCell r = new CounterCell(x); // Optimistic create
6172	+	if (cellsBusy == 0 &&
6173	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6174	+	boolean created = false;
6175	+	try {               // Recheck under lock
6176	+	CounterCell[] rs; int m, j;
6177	+	if ((rs = counterCells) != null &&
6178	+	(m = rs.length) > 0 &&
6179	+	rs[j = (m - 1) & h] == null) {
6180	+	rs[j] = r;
6181	+	created = true;
6182	+	}
6183	+	} finally {
6184	+	cellsBusy = 0;
6185	+	}
6186	+	if (created)
6187	+	break;
6188	+	continue;           // Slot is now non-empty
6189	+	}
6190	+	}
6191	+	collide = false;
6192	+	}
6193	+	else if (!wasUncontended)       // CAS already known to fail
6194	+	wasUncontended = true;      // Continue after rehash
6195	+	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
6196	+	break;
6197	+	else if (counterCells != as || n >= NCPU)
6198	+	collide = false;            // At max size or stale
6199	+	else if (!collide)
6200	+	collide = true;
6201	+	else if (cellsBusy == 0 &&
6202	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6203	+	try {
6204	+	if (counterCells == as) {// Expand table unless stale
6205	+	CounterCell[] rs = new CounterCell[n << 1];
6206	+	for (int i = 0; i < n; ++i)
6207	+	rs[i] = as[i];
6208	+	counterCells = rs;
6209	+	}
6210	+	} finally {
6211	+	cellsBusy = 0;
6212	+	}
6213	+	collide = false;
6214	+	continue;                   // Retry with expanded table
6215	+	}
6216	+	h ^= h << 13;                   // Rehash
6217	+	h ^= h >>> 17;
6218	+	h ^= h << 5;
6219	+	}
6220	+	else if (cellsBusy == 0 && counterCells == as &&
6221	+	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6222	+	boolean init = false;
6223	+	try {                           // Initialize table
6224	+	if (counterCells == as) {
6225	+	CounterCell[] rs = new CounterCell[2];
6226	+	rs[h & 1] = new CounterCell(x);
6227	+	counterCells = rs;
6228	+	init = true;
6229	+	}
6230	+	} finally {
6231	+	cellsBusy = 0;
6232	+	}
6233	+	if (init)
6234	+	break;
6235	+	}
6236	+	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
6237	+	break;                          // Fall back on using base
6238	+	}
6239	+	hc.code = h;                            // Record index for next time
6240	+	}
6241
6242		// Unsafe mechanics
6243	<	private static final sun.misc.Unsafe UNSAFE;
6244	<	private static final long counterOffset;
6245	<	private static final long sizeCtlOffset;
6243	>	private static final sun.misc.Unsafe U;
6244	>	private static final long SIZECTL;
6245	>	private static final long TRANSFERINDEX;
6246	>	private static final long BASECOUNT;
6247	>	private static final long CELLSBUSY;
6248	>	private static final long CELLVALUE;
6249		private static final long ABASE;
6250		private static final int ASHIFT;
6251
6252		static {
6769	–	int ss;
6253		try {
6254	<	UNSAFE = getUnsafe();
6254	>	U = getUnsafe();
6255		Class<?> k = ConcurrentHashMapV8.class;
6256	<	counterOffset = UNSAFE.objectFieldOffset
6774	<	(k.getDeclaredField("counter"));
6775	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6256	>	SIZECTL = U.objectFieldOffset
6257		(k.getDeclaredField("sizeCtl"));
6258	<	Class<?> sc = Node[].class;
6259	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6260	<	ss = UNSAFE.arrayIndexScale(sc);
6258	>	TRANSFERINDEX = U.objectFieldOffset
6259	>	(k.getDeclaredField("transferIndex"));
6260	>	BASECOUNT = U.objectFieldOffset
6261	>	(k.getDeclaredField("baseCount"));
6262	>	CELLSBUSY = U.objectFieldOffset
6263	>	(k.getDeclaredField("cellsBusy"));
6264	>	Class<?> ck = CounterCell.class;
6265	>	CELLVALUE = U.objectFieldOffset
6266	>	(ck.getDeclaredField("value"));
6267	>	Class<?> ak = Node[].class;
6268	>	ABASE = U.arrayBaseOffset(ak);
6269	>	int scale = U.arrayIndexScale(ak);
6270	>	if ((scale & (scale - 1)) != 0)
6271	>	throw new Error("data type scale not a power of two");
6272	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6273		} catch (Exception e) {
6274		throw new Error(e);
6275		}
6783	–	if ((ss & (ss-1)) != 0)
6784	–	throw new Error("data type scale not a power of two");
6785	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6276		}
6277
6278		/**
#	Line 6795 | Line 6285 | public class ConcurrentHashMapV8<K, V>
6285		private static sun.misc.Unsafe getUnsafe() {
6286		try {
6287		return sun.misc.Unsafe.getUnsafe();
6288	<	} catch (SecurityException se) {
6289	<	try {
6290	<	return java.security.AccessController.doPrivileged
6291	<	(new java.security
6292	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6293	<	public sun.misc.Unsafe run() throws Exception {
6294	<	java.lang.reflect.Field f = sun.misc
6295	<	.Unsafe.class.getDeclaredField("theUnsafe");
6296	<	f.setAccessible(true);
6297	<	return (sun.misc.Unsafe) f.get(null);
6298	<	}});
6299	<	} catch (java.security.PrivilegedActionException e) {
6300	<	throw new RuntimeException("Could not initialize intrinsics",
6301	<	e.getCause());
6302	<	}
6288	>	} catch (SecurityException tryReflectionInstead) {}
6289	>	try {
6290	>	return java.security.AccessController.doPrivileged
6291	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6292	>	public sun.misc.Unsafe run() throws Exception {
6293	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6294	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6295	>	f.setAccessible(true);
6296	>	Object x = f.get(null);
6297	>	if (k.isInstance(x))
6298	>	return k.cast(x);
6299	>	}
6300	>	throw new NoSuchFieldError("the Unsafe");
6301	>	}});
6302	>	} catch (java.security.PrivilegedActionException e) {
6303	>	throw new RuntimeException("Could not initialize intrinsics",
6304	>	e.getCause());
6305		}
6306		}
6307		}

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