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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.66 by jsr166, Sun Oct 21 03:26:47 2012 UTC vs.
Revision 1.116 by dl, Wed Sep 11 14:53:38 2013 UTC

#	Line 5 | Line 5
5		*/
6
7		package jsr166e;
8	<	import jsr166e.LongAdder;
8	>
9		import jsr166e.ForkJoinPool;
10	–	import jsr166e.ForkJoinTask;
10
11	<	import java.util.Comparator;
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;
14	–	import java.util.Map;
15	–	import java.util.Set;
17		import java.util.Collection;
18	<	import java.util.AbstractMap;
19	<	import java.util.AbstractSet;
20	<	import java.util.AbstractCollection;
20	<	import java.util.Hashtable;
18	>	import java.util.Comparator;
19	>	import java.util.ConcurrentModificationException;
20	>	import java.util.Enumeration;
21		import java.util.HashMap;
22	+	import java.util.Hashtable;
23		import java.util.Iterator;
24	<	import java.util.Enumeration;
24	<	import java.util.ConcurrentModificationException;
24	>	import java.util.Map;
25		import java.util.NoSuchElementException;
26	+	import java.util.Set;
27		import java.util.concurrent.ConcurrentMap;
27	–	import java.util.concurrent.ThreadLocalRandom;
28	–	import java.util.concurrent.locks.LockSupport;
29	–	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
28		import java.util.concurrent.atomic.AtomicReference;
29	<
30	<	import java.io.Serializable;
29	>	import java.util.concurrent.atomic.AtomicInteger;
30	>	import java.util.concurrent.locks.LockSupport;
31	>	import java.util.concurrent.locks.ReentrantLock;
32
33		/**
34		* A hash table supporting full concurrency of retrievals and
#	Line 43 | Line 42 | import java.io.Serializable;
42		* interoperable with {@code Hashtable} in programs that rely on its
43		* thread safety but not on its synchronization details.
44		*
45	<	* <p> Retrieval operations (including {@code get}) generally do not
45	>	* <p>Retrieval operations (including {@code get}) generally do not
46		* block, so may overlap with update operations (including {@code put}
47		* and {@code remove}). Retrievals reflect the results of the most
48		* recently <em>completed</em> update operations holding upon their
#	Line 64 | Line 63 | import java.io.Serializable;
63		* that may be adequate for monitoring or estimation purposes, but not
64		* for program control.
65		*
66	<	* <p> The table is dynamically expanded when there are too many
66	>	* <p>The table is dynamically expanded when there are too many
67		* collisions (i.e., keys that have distinct hash codes but fall into
68		* the same slot modulo the table size), with the expected average
69		* effect of maintaining roughly two bins per mapping (corresponding
#	Line 83 | Line 82 | import java.io.Serializable;
82		* expected {@code concurrencyLevel} as an additional hint for
83		* internal sizing.  Note that using many keys with exactly the same
84		* {@code hashCode()} is a sure way to slow down performance of any
85	<	* hash table.
85	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
86	>	* this class may use comparison order among keys to help break ties.
87	>	*
88	>	* <p>A {@link Set} projection of a ConcurrentHashMapV8 may be created
89	>	* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
90	>	* (using {@link #keySet(Object)} when only keys are of interest, and the
91	>	* mapped values are (perhaps transiently) not used or all take the
92	>	* same mapping value.
93		*
94		* <p>This class and its views and iterators implement all of the
95		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
96		* interfaces.
97		*
98	<	* <p> Like {@link Hashtable} but unlike {@link HashMap}, this class
98	>	* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
99		* does <em>not</em> allow {@code null} to be used as a key or value.
100		*
101	+	* <p>ConcurrentHashMapV8s support a set of sequential and parallel bulk
102	+	* operations that are designed
103	+	* to be safely, and often sensibly, applied even with maps that are
104	+	* being concurrently updated by other threads; for example, when
105	+	* computing a snapshot summary of the values in a shared registry.
106	+	* There are three kinds of operation, each with four forms, accepting
107	+	* functions with Keys, Values, Entries, and (Key, Value) arguments
108	+	* and/or return values. Because the elements of a ConcurrentHashMapV8
109	+	* are not ordered in any particular way, and may be processed in
110	+	* different orders in different parallel executions, the correctness
111	+	* of supplied functions should not depend on any ordering, or on any
112	+	* other objects or values that may transiently change while
113	+	* computation is in progress; and except for forEach actions, should
114	+	* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry}
115	+	* objects do not support method {@code setValue}.
116	+	*
117	+	* <ul>
118	+	* <li> forEach: Perform a given action on each element.
119	+	* A variant form applies a given transformation on each element
120	+	* before performing the action.</li>
121	+	*
122	+	* <li> search: Return the first available non-null result of
123	+	* applying a given function on each element; skipping further
124	+	* search when a result is found.</li>
125	+	*
126	+	* <li> reduce: Accumulate each element.  The supplied reduction
127	+	* function cannot rely on ordering (more formally, it should be
128	+	* both associative and commutative).  There are five variants:
129	+	*
130	+	* <ul>
131	+	*
132	+	* <li> Plain reductions. (There is not a form of this method for
133	+	* (key, value) function arguments since there is no corresponding
134	+	* return type.)</li>
135	+	*
136	+	* <li> Mapped reductions that accumulate the results of a given
137	+	* function applied to each element.</li>
138	+	*
139	+	* <li> Reductions to scalar doubles, longs, and ints, using a
140	+	* given basis value.</li>
141	+	*
142	+	* </ul>
143	+	* </li>
144	+	* </ul>
145	+	*
146	+	* <p>These bulk operations accept a {@code parallelismThreshold}
147	+	* argument. Methods proceed sequentially if the current map size is
148	+	* estimated to be less than the given threshold. Using a value of
149	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
150	+	* of {@code 1} results in maximal parallelism by partitioning into
151	+	* enough subtasks to fully utilize the {@link
152	+	* ForkJoinPool#commonPool()} that is used for all parallel
153	+	* computations. Normally, you would initially choose one of these
154	+	* extreme values, and then measure performance of using in-between
155	+	* values that trade off overhead versus throughput.
156	+	*
157	+	* <p>The concurrency properties of bulk operations follow
158	+	* from those of ConcurrentHashMapV8: Any non-null result returned
159	+	* from {@code get(key)} and related access methods bears a
160	+	* happens-before relation with the associated insertion or
161	+	* update.  The result of any bulk operation reflects the
162	+	* composition of these per-element relations (but is not
163	+	* necessarily atomic with respect to the map as a whole unless it
164	+	* is somehow known to be quiescent).  Conversely, because keys
165	+	* and values in the map are never null, null serves as a reliable
166	+	* atomic indicator of the current lack of any result.  To
167	+	* maintain this property, null serves as an implicit basis for
168	+	* all non-scalar reduction operations. For the double, long, and
169	+	* int versions, the basis should be one that, when combined with
170	+	* any other value, returns that other value (more formally, it
171	+	* should be the identity element for the reduction). Most common
172	+	* reductions have these properties; for example, computing a sum
173	+	* with basis 0 or a minimum with basis MAX_VALUE.
174	+	*
175	+	* <p>Search and transformation functions provided as arguments
176	+	* should similarly return null to indicate the lack of any result
177	+	* (in which case it is not used). In the case of mapped
178	+	* reductions, this also enables transformations to serve as
179	+	* filters, returning null (or, in the case of primitive
180	+	* specializations, the identity basis) if the element should not
181	+	* be combined. You can create compound transformations and
182	+	* filterings by composing them yourself under this "null means
183	+	* there is nothing there now" rule before using them in search or
184	+	* reduce operations.
185	+	*
186	+	* <p>Methods accepting and/or returning Entry arguments maintain
187	+	* key-value associations. They may be useful for example when
188	+	* finding the key for the greatest value. Note that "plain" Entry
189	+	* arguments can be supplied using {@code new
190	+	* AbstractMap.SimpleEntry(k,v)}.
191	+	*
192	+	* <p>Bulk operations may complete abruptly, throwing an
193	+	* exception encountered in the application of a supplied
194	+	* function. Bear in mind when handling such exceptions that other
195	+	* concurrently executing functions could also have thrown
196	+	* exceptions, or would have done so if the first exception had
197	+	* not occurred.
198	+	*
199	+	* <p>Speedups for parallel compared to sequential forms are common
200	+	* but not guaranteed.  Parallel operations involving brief functions
201	+	* on small maps may execute more slowly than sequential forms if the
202	+	* underlying work to parallelize the computation is more expensive
203	+	* than the computation itself.  Similarly, parallelization may not
204	+	* lead to much actual parallelism if all processors are busy
205	+	* performing unrelated tasks.
206	+	*
207	+	* <p>All arguments to all task methods must be non-null.
208	+	*
209	+	* <p><em>jsr166e note: During transition, this class
210	+	* uses nested functional interfaces with different names but the
211	+	* same forms as those expected for JDK8.</em>
212	+	*
213		* <p>This class is a member of the
214		* <a href="{@docRoot}/../technotes/guides/collections/index.html">
215		* Java Collections Framework</a>.
216		*
99	–	* <p><em>jsr166e note: This class is a candidate replacement for
100	–	* java.util.concurrent.ConcurrentHashMap.  During transition, this
101	–	* class declares and uses nested functional interfaces with different
102	–	* names but the same forms as those expected for JDK8.<em>
103	–	*
217		* @since 1.5
218		* @author Doug Lea
219		* @param <K> the type of keys maintained by this map
220		* @param <V> the type of mapped values
221		*/
222	<	public class ConcurrentHashMapV8<K, V>
223	<	implements ConcurrentMap<K, V>, Serializable {
222	>	public class ConcurrentHashMapV8<K,V> extends AbstractMap<K,V>
223	>	implements ConcurrentMap<K,V>, Serializable {
224		private static final long serialVersionUID = 7249069246763182397L;
225
226		/**
227	<	* A partitionable iterator. A Spliterator can be traversed
228	<	* directly, but can also be partitioned (before traversal) by
229	<	* creating another Spliterator that covers a non-overlapping
117	<	* portion of the elements, and so may be amenable to parallel
118	<	* execution.
119	<	*
120	<	* <p> This interface exports a subset of expected JDK8
121	<	* functionality.
122	<	*
123	<	* <p>Sample usage: Here is one (of the several) ways to compute
124	<	* the sum of the values held in a map using the ForkJoin
125	<	* framework. As illustrated here, Spliterators are well suited to
126	<	* designs in which a task repeatedly splits off half its work
127	<	* into forked subtasks until small enough to process directly,
128	<	* and then joins these subtasks. Variants of this style can also
129	<	* be used in completion-based designs.
130	<	*
131	<	* <pre>
132	<	* {@code ConcurrentHashMapV8<String, Long> m = ...
133	<	* // split as if have 8 * parallelism, for load balance
134	<	* int n = m.size();
135	<	* int p = aForkJoinPool.getParallelism() * 8;
136	<	* int split = (n < p)? n : p;
137	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
138	<	* // ...
139	<	* static class SumValues extends RecursiveTask<Long> {
140	<	*   final Spliterator<Long> s;
141	<	*   final int split;             // split while > 1
142	<	*   final SumValues nextJoin;    // records forked subtasks to join
143	<	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
144	<	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
145	<	*   }
146	<	*   public Long compute() {
147	<	*     long sum = 0;
148	<	*     SumValues subtasks = null; // fork subtasks
149	<	*     for (int s = split >>> 1; s > 0; s >>>= 1)
150	<	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
151	<	*     while (s.hasNext())        // directly process remaining elements
152	<	*       sum += s.next();
153	<	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
154	<	*       sum += t.join();         // collect subtask results
155	<	*     return sum;
156	<	*   }
157	<	* }
158	<	* }</pre>
227	>	* An object for traversing and partitioning elements of a source.
228	>	* This interface provides a subset of the functionality of JDK8
229	>	* java.util.Spliterator.
230		*/
231	<	public static interface Spliterator<T> extends Iterator<T> {
231	>	public static interface ConcurrentHashMapSpliterator<T> {
232		/**
233	<	* Returns a Spliterator covering approximately half of the
234	<	* elements, guaranteed not to overlap with those subsequently
235	<	* returned by this Spliterator.  After invoking this method,
236	<	* the current Spliterator will <em>not</em> produce any of
166	<	* the elements of the returned Spliterator, but the two
167	<	* Spliterators together will produce all of the elements that
168	<	* would have been produced by this Spliterator had this
169	<	* method not been called. The exact number of elements
170	<	* produced by the returned Spliterator is not guaranteed, and
171	<	* may be zero (i.e., with {@code hasNext()} reporting {@code
172	<	* false}) if this Spliterator cannot be further split.
173	<	*
174	<	* @return a Spliterator covering approximately half of the
175	<	* elements
176	<	* @throws IllegalStateException if this Spliterator has
177	<	* already commenced traversing elements
233	>	* If possible, returns a new spliterator covering
234	>	* approximately one half of the elements, which will not be
235	>	* covered by this spliterator. Returns null if cannot be
236	>	* split.
237		*/
238	<	Spliterator<T> split();
238	>	ConcurrentHashMapSpliterator<T> trySplit();
239	>	/**
240	>	* Returns an estimate of the number of elements covered by
241	>	* this Spliterator.
242	>	*/
243	>	long estimateSize();
244	>
245	>	/** Applies the action to each untraversed element */
246	>	void forEachRemaining(Action<? super T> action);
247	>	/** If an element remains, applies the action and returns true. */
248	>	boolean tryAdvance(Action<? super T> action);
249		}
250
251	+	// Sams
252	+	/** Interface describing a void action of one argument */
253	+	public interface Action<A> { void apply(A a); }
254	+	/** Interface describing a void action of two arguments */
255	+	public interface BiAction<A,B> { void apply(A a, B b); }
256	+	/** Interface describing a function of one argument */
257	+	public interface Fun<A,T> { T apply(A a); }
258	+	/** Interface describing a function of two arguments */
259	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
260	+	/** Interface describing a function mapping its argument to a double */
261	+	public interface ObjectToDouble<A> { double apply(A a); }
262	+	/** Interface describing a function mapping its argument to a long */
263	+	public interface ObjectToLong<A> { long apply(A a); }
264	+	/** Interface describing a function mapping its argument to an int */
265	+	public interface ObjectToInt<A> {int apply(A a); }
266	+	/** Interface describing a function mapping two arguments to a double */
267	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
268	+	/** Interface describing a function mapping two arguments to a long */
269	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
270	+	/** Interface describing a function mapping two arguments to an int */
271	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
272	+	/** Interface describing a function mapping two doubles to a double */
273	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
274	+	/** Interface describing a function mapping two longs to a long */
275	+	public interface LongByLongToLong { long apply(long a, long b); }
276	+	/** Interface describing a function mapping two ints to an int */
277	+	public interface IntByIntToInt { int apply(int a, int b); }
278	+
279	+
280		/*
281		* Overview:
282		*
#	Line 189 | Line 287 | public class ConcurrentHashMapV8<K, V>
287		* the same or better than java.util.HashMap, and to support high
288		* initial insertion rates on an empty table by many threads.
289		*
290	<	* Each key-value mapping is held in a Node.  Because Node fields
291	<	* can contain special values, they are defined using plain Object
292	<	* types. Similarly in turn, all internal methods that use them
293	<	* work off Object types. And similarly, so do the internal
294	<	* methods of auxiliary iterator and view classes.  All public
295	<	* generic typed methods relay in/out of these internal methods,
296	<	* supplying null-checks and casts as needed. This also allows
297	<	* many of the public methods to be factored into a smaller number
298	<	* of internal methods (although sadly not so for the five
299	<	* variants of put-related operations). The validation-based
300	<	* approach explained below leads to a lot of code sprawl because
301	<	* retry-control precludes factoring into smaller methods.
290	>	* This map usually acts as a binned (bucketed) hash table.  Each
291	>	* key-value mapping is held in a Node.  Most nodes are instances
292	>	* of the basic Node class with hash, key, value, and next
293	>	* fields. However, various subclasses exist: TreeNodes are
294	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
295	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
296	>	* of bins during resizing. ReservationNodes are used as
297	>	* placeholders while establishing values in computeIfAbsent and
298	>	* related methods.  The types TreeBin, ForwardingNode, and
299	>	* ReservationNode do not hold normal user keys, values, or
300	>	* hashes, and are readily distinguishable during search etc
301	>	* because they have negative hash fields and null key and value
302	>	* fields. (These special nodes are either uncommon or transient,
303	>	* so the impact of carrying around some unused fields is
304	>	* insignificant.)
305		*
306		* The table is lazily initialized to a power-of-two size upon the
307		* first insertion.  Each bin in the table normally contains a
#	Line 208 | Line 309 | public class ConcurrentHashMapV8<K, V>
309		* Table accesses require volatile/atomic reads, writes, and
310		* CASes.  Because there is no other way to arrange this without
311		* adding further indirections, we use intrinsics
312	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
313	<	* are always accurately traversable under volatile reads, so long
314	<	* as lookups check hash code and non-nullness of value before
315	<	* checking key equality.
316	<	*
317	<	* We use the top two bits of Node hash fields for control
217	<	* purposes -- they are available anyway because of addressing
218	<	* constraints.  As explained further below, these top bits are
219	<	* used as follows:
220	<	*  00 - Normal
221	<	*  01 - Locked
222	<	*  11 - Locked and may have a thread waiting for lock
223	<	*  10 - Node is a forwarding node
224	<	*
225	<	* The lower 30 bits of each Node's hash field contain a
226	<	* transformation of the key's hash code, except for forwarding
227	<	* nodes, for which the lower bits are zero (and so always have
228	<	* hash field == MOVED).
312	>	* (sun.misc.Unsafe) operations.
313	>	*
314	>	* We use the top (sign) bit of Node hash fields for control
315	>	* purposes -- it is available anyway because of addressing
316	>	* constraints.  Nodes with negative hash fields are specially
317	>	* handled or ignored in map methods.
318		*
319		* Insertion (via put or its variants) of the first node in an
320		* empty bin is performed by just CASing it to the bin.  This is
#	Line 234 | Line 323 | public class ConcurrentHashMapV8<K, V>
323		* delete, and replace) require locks.  We do not want to waste
324		* the space required to associate a distinct lock object with
325		* each bin, so instead use the first node of a bin list itself as
326	<	* a lock. Blocking support for these locks relies on the builtin
327	<	* "synchronized" monitors.  However, we also need a tryLock
239	<	* construction, so we overlay these by using bits of the Node
240	<	* hash field for lock control (see above), and so normally use
241	<	* builtin monitors only for blocking and signalling using
242	<	* wait/notifyAll constructions. See Node.tryAwaitLock.
326	>	* a lock. Locking support for these locks relies on builtin
327	>	* "synchronized" monitors.
328		*
329		* Using the first node of a list as a lock does not by itself
330		* suffice though: When a node is locked, any update must first
331		* validate that it is still the first node after locking it, and
332		* retry if not. Because new nodes are always appended to lists,
333		* once a node is first in a bin, it remains first until deleted
334	<	* or the bin becomes invalidated (upon resizing).  However,
250	<	* operations that only conditionally update may inspect nodes
251	<	* until the point of update. This is a converse of sorts to the
252	<	* lazy locking technique described by Herlihy & Shavit.
334	>	* or the bin becomes invalidated (upon resizing).
335		*
336		* The main disadvantage of per-bin locks is that other update
337		* operations on other nodes in a bin list protected by the same
#	Line 282 | Line 364 | public class ConcurrentHashMapV8<K, V>
364		* sometimes deviate significantly from uniform randomness.  This
365		* includes the case when N > (1<<30), so some keys MUST collide.
366		* Similarly for dumb or hostile usages in which multiple keys are
367	<	* designed to have identical hash codes. Also, although we guard
368	<	* against the worst effects of this (see method spread), sets of
369	<	* hashes may differ only in bits that do not impact their bin
370	<	* index for a given power-of-two mask.  So we use a secondary
371	<	* strategy that applies when the number of nodes in a bin exceeds
372	<	* a threshold, and at least one of the keys implements
291	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
292	<	* (a specialized form of red-black trees), bounding search time
293	<	* to O(log N).  Each search step in a TreeBin is around twice as
367	>	* designed to have identical hash codes or ones that differs only
368	>	* in masked-out high bits. So we use a secondary strategy that
369	>	* applies when the number of nodes in a bin exceeds a
370	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
371	>	* specialized form of red-black trees), bounding search time to
372	>	* O(log N).  Each search step in a TreeBin is at least twice as
373		* slow as in a regular list, but given that N cannot exceed
374		* (1<<64) (before running out of addresses) this bounds search
375		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 301 | Line 380 | public class ConcurrentHashMapV8<K, V>
380		* iterators in the same way.
381		*
382		* The table is resized when occupancy exceeds a percentage
383	<	* threshold (nominally, 0.75, but see below).  Only a single
384	<	* thread performs the resize (using field "sizeCtl", to arrange
385	<	* exclusion), but the table otherwise remains usable for reads
386	<	* and updates. Resizing proceeds by transferring bins, one by
387	<	* one, from the table to the next table.  Because we are using
383	>	* threshold (nominally, 0.75, but see below).  Any thread
384	>	* noticing an overfull bin may assist in resizing after the
385	>	* initiating thread allocates and sets up the replacement array.
386	>	* However, rather than stalling, these other threads may proceed
387	>	* with insertions etc.  The use of TreeBins shields us from the
388	>	* worst case effects of overfilling while resizes are in
389	>	* progress.  Resizing proceeds by transferring bins, one by one,
390	>	* from the table to the next table. However, threads claim small
391	>	* blocks of indices to transfer (via field transferIndex) before
392	>	* doing so, reducing contention.  Because we are using
393		* power-of-two expansion, the elements from each bin must either
394		* stay at same index, or move with a power of two offset. We
395		* eliminate unnecessary node creation by catching cases where old
#	Line 319 | Line 403 | public class ConcurrentHashMapV8<K, V>
403		* its key. On encountering a forwarding node, access and update
404		* operations restart, using the new table.
405		*
406	<	* Each bin transfer requires its bin lock. However, unlike other
407	<	* cases, a transfer can skip a bin if it fails to acquire its
408	<	* lock, and revisit it later (unless it is a TreeBin). Method
409	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
410	<	* have been skipped because of failure to acquire a lock, and
411	<	* blocks only if none are available (i.e., only very rarely).
412	<	* The transfer operation must also ensure that all accessible
413	<	* bins in both the old and new table are usable by any traversal.
414	<	* When there are no lock acquisition failures, this is arranged
415	<	* simply by proceeding from the last bin (table.length - 1) up
416	<	* towards the first.  Upon seeing a forwarding node, traversals
417	<	* (see class Iter) arrange to move to the new table
418	<	* without revisiting nodes.  However, when any node is skipped
419	<	* during a transfer, all earlier table bins may have become
420	<	* visible, so are initialized with a reverse-forwarding node back
421	<	* to the old table until the new ones are established. (This
422	<	* sometimes requires transiently locking a forwarding node, which
423	<	* is possible under the above encoding.) These more expensive
424	<	* mechanics trigger only when necessary.
406	>	* Each bin transfer requires its bin lock, which can stall
407	>	* waiting for locks while resizing. However, because other
408	>	* threads can join in and help resize rather than contend for
409	>	* locks, average aggregate waits become shorter as resizing
410	>	* progresses.  The transfer operation must also ensure that all
411	>	* accessible bins in both the old and new table are usable by any
412	>	* traversal.  This is arranged in part by proceeding from the
413	>	* last bin (table.length - 1) up towards the first.  Upon seeing
414	>	* a forwarding node, traversals (see class Traverser) arrange to
415	>	* move to the new table without revisiting nodes.  To ensure that
416	>	* no intervening nodes are skipped even when moved out of order,
417	>	* a stack (see class TableStack) is created on first encounter of
418	>	* a forwarding node during a traversal, to maintain its place if
419	>	* later processing the current table. The need for these
420	>	* save/restore mechanics is relatively rare, but when one
421	>	* forwarding node is encountered, typically many more will be.
422	>	* So Traversers use a simple caching scheme to avoid creating so
423	>	* many new TableStack nodes. (Thanks to Peter Levart for
424	>	* suggesting use of a stack here.)
425		*
426		* The traversal scheme also applies to partial traversals of
427		* ranges of bins (via an alternate Traverser constructor)
#	Line 352 | Line 436 | public class ConcurrentHashMapV8<K, V>
436		* These cases attempt to override the initial capacity settings,
437		* but harmlessly fail to take effect in cases of races.
438		*
439	<	* The element count is maintained using a LongAdder, which avoids
440	<	* contention on updates but can encounter cache thrashing if read
441	<	* too frequently during concurrent access. To avoid reading so
442	<	* often, resizing is attempted either when a bin lock is
443	<	* contended, or upon adding to a bin already holding two or more
444	<	* nodes (checked before adding in the xIfAbsent methods, after
445	<	* adding in others). Under uniform hash distributions, the
446	<	* probability of this occurring at threshold is around 13%,
447	<	* meaning that only about 1 in 8 puts check threshold (and after
448	<	* resizing, many fewer do so). But this approximation has high
449	<	* variance for small table sizes, so we check on any collision
450	<	* for sizes <= 64. The bulk putAll operation further reduces
451	<	* contention by only committing count updates upon these size
452	<	* checks.
439	>	* The element count is maintained using a specialization of
440	>	* LongAdder. We need to incorporate a specialization rather than
441	>	* just use a LongAdder in order to access implicit
442	>	* contention-sensing that leads to creation of multiple
443	>	* CounterCells.  The counter mechanics avoid contention on
444	>	* updates but can encounter cache thrashing if read too
445	>	* frequently during concurrent access. To avoid reading so often,
446	>	* resizing under contention is attempted only upon adding to a
447	>	* bin already holding two or more nodes. Under uniform hash
448	>	* distributions, the probability of this occurring at threshold
449	>	* is around 13%, meaning that only about 1 in 8 puts check
450	>	* threshold (and after resizing, many fewer do so).
451	>	*
452	>	* TreeBins use a special form of comparison for search and
453	>	* related operations (which is the main reason we cannot use
454	>	* existing collections such as TreeMaps). TreeBins contain
455	>	* Comparable elements, but may contain others, as well as
456	>	* elements that are Comparable but not necessarily Comparable for
457	>	* the same T, so we cannot invoke compareTo among them. To handle
458	>	* this, the tree is ordered primarily by hash value, then by
459	>	* Comparable.compareTo order if applicable.  On lookup at a node,
460	>	* if elements are not comparable or compare as 0 then both left
461	>	* and right children may need to be searched in the case of tied
462	>	* hash values. (This corresponds to the full list search that
463	>	* would be necessary if all elements were non-Comparable and had
464	>	* tied hashes.) On insertion, to keep a total ordering (or as
465	>	* close as is required here) across rebalancings, we compare
466	>	* classes and identityHashCodes as tie-breakers. The red-black
467	>	* balancing code is updated from pre-jdk-collections
468	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
469	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
470	>	* Algorithms" (CLR).
471	>	*
472	>	* TreeBins also require an additional locking mechanism.  While
473	>	* list traversal is always possible by readers even during
474	>	* updates, tree traversal is not, mainly because of tree-rotations
475	>	* that may change the root node and/or its linkages.  TreeBins
476	>	* include a simple read-write lock mechanism parasitic on the
477	>	* main bin-synchronization strategy: Structural adjustments
478	>	* associated with an insertion or removal are already bin-locked
479	>	* (and so cannot conflict with other writers) but must wait for
480	>	* ongoing readers to finish. Since there can be only one such
481	>	* waiter, we use a simple scheme using a single "waiter" field to
482	>	* block writers.  However, readers need never block.  If the root
483	>	* lock is held, they proceed along the slow traversal path (via
484	>	* next-pointers) until the lock becomes available or the list is
485	>	* exhausted, whichever comes first. These cases are not fast, but
486	>	* maximize aggregate expected throughput.
487		*
488		* Maintaining API and serialization compatibility with previous
489		* versions of this class introduces several oddities. Mainly: We
#	Line 375 | Line 493 | public class ConcurrentHashMapV8<K, V>
493		* time that we can guarantee to honor it.) We also declare an
494		* unused "Segment" class that is instantiated in minimal form
495		* only when serializing.
496	+	*
497	+	* Also, solely for compatibility with previous versions of this
498	+	* class, it extends AbstractMap, even though all of its methods
499	+	* are overridden, so it is just useless baggage.
500	+	*
501	+	* This file is organized to make things a little easier to follow
502	+	* while reading than they might otherwise: First the main static
503	+	* declarations and utilities, then fields, then main public
504	+	* methods (with a few factorings of multiple public methods into
505	+	* internal ones), then sizing methods, trees, traversers, and
506	+	* bulk operations.
507		*/
508
509		/* ---------------- Constants -------------- */
#	Line 416 | Line 545 | public class ConcurrentHashMapV8<K, V>
545		private static final float LOAD_FACTOR = 0.75f;
546
547		/**
419	–	* The buffer size for skipped bins during transfers. The
420	–	* value is arbitrary but should be large enough to avoid
421	–	* most locking stalls during resizes.
422	–	*/
423	–	private static final int TRANSFER_BUFFER_SIZE = 32;
424	–
425	–	/**
548		* The bin count threshold for using a tree rather than list for a
549	<	* bin.  The value reflects the approximate break-even point for
550	<	* using tree-based operations.
549	>	* bin.  Bins are converted to trees when adding an element to a
550	>	* bin with at least this many nodes. The value must be greater
551	>	* than 2, and should be at least 8 to mesh with assumptions in
552	>	* tree removal about conversion back to plain bins upon
553	>	* shrinkage.
554		*/
555	<	private static final int TREE_THRESHOLD = 8;
431	<
432	<	/*
433	<	* Encodings for special uses of Node hash fields. See above for
434	<	* explanation.
435	<	*/
436	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
437	<	static final int LOCKED    = 0x40000000; // set/tested only as a bit
438	<	static final int WAITING   = 0xc0000000; // both bits set/tested together
439	<	static final int HASH_BITS = 0x3fffffff; // usable bits of normal node hash
440	<
441	<	/* ---------------- Fields -------------- */
555	>	static final int TREEIFY_THRESHOLD = 8;
556
557		/**
558	<	* The array of bins. Lazily initialized upon first insertion.
559	<	* Size is always a power of two. Accessed directly by iterators.
558	>	* The bin count threshold for untreeifying a (split) bin during a
559	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
560	>	* most 6 to mesh with shrinkage detection under removal.
561		*/
562	<	transient volatile Node[] table;
562	>	static final int UNTREEIFY_THRESHOLD = 6;
563
564		/**
565	<	* The counter maintaining number of elements.
565	>	* The smallest table capacity for which bins may be treeified.
566	>	* (Otherwise the table is resized if too many nodes in a bin.)
567	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
568	>	* conflicts between resizing and treeification thresholds.
569		*/
570	<	private transient final LongAdder counter;
570	>	static final int MIN_TREEIFY_CAPACITY = 64;
571
572		/**
573	<	* Table initialization and resizing control.  When negative, the
574	<	* table is being initialized or resized. Otherwise, when table is
575	<	* null, holds the initial table size to use upon creation, or 0
576	<	* for default. After initialization, holds the next element count
577	<	* value upon which to resize the table.
573	>	* Minimum number of rebinnings per transfer step. Ranges are
574	>	* subdivided to allow multiple resizer threads.  This value
575	>	* serves as a lower bound to avoid resizers encountering
576	>	* excessive memory contention.  The value should be at least
577	>	* DEFAULT_CAPACITY.
578		*/
579	<	private transient volatile int sizeCtl;
462	<
463	<	// views
464	<	private transient KeySet<K,V> keySet;
465	<	private transient Values<K,V> values;
466	<	private transient EntrySet<K,V> entrySet;
467	<
468	<	/** For serialization compatibility. Null unless serialized; see below */
469	<	private Segment<K,V>[] segments;
470	<
471	<	/* ---------------- Table element access -------------- */
579	>	private static final int MIN_TRANSFER_STRIDE = 16;
580
581		/*
582	<	* Volatile access methods are used for table elements as well as
475	<	* elements of in-progress next table while resizing.  Uses are
476	<	* null checked by callers, and implicitly bounds-checked, relying
477	<	* on the invariants that tab arrays have non-zero size, and all
478	<	* indices are masked with (tab.length - 1) which is never
479	<	* negative and always less than length. Note that, to be correct
480	<	* wrt arbitrary concurrency errors by users, bounds checks must
481	<	* operate on local variables, which accounts for some odd-looking
482	<	* inline assignments below.
582	>	* Encodings for Node hash fields. See above for explanation.
583		*/
584	<
585	<	static final Node tabAt(Node[] tab, int i) { // used by Iter
586	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
587	<	}
588	<
589	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
590	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
591	<	}
592	<
593	<	private static final void setTabAt(Node[] tab, int i, Node v) {
594	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
595	<	}
584	>	static final int MOVED     = -1; // hash for forwarding nodes
585	>	static final int TREEBIN   = -2; // hash for roots of trees
586	>	static final int RESERVED  = -3; // hash for transient reservations
587	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
588	>
589	>	/** Number of CPUS, to place bounds on some sizings */
590	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
591	>
592	>	/** For serialization compatibility. */
593	>	private static final ObjectStreamField[] serialPersistentFields = {
594	>	new ObjectStreamField("segments", Segment[].class),
595	>	new ObjectStreamField("segmentMask", Integer.TYPE),
596	>	new ObjectStreamField("segmentShift", Integer.TYPE)
597	>	};
598
599		/* ---------------- Nodes -------------- */
600
601		/**
602	<	* Key-value entry. Note that this is never exported out as a
603	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
604	<	* field of MOVED are special, and do not contain user keys or
605	<	* values.  Otherwise, keys are never null, and null val fields
606	<	* indicate that a node is in the process of being deleted or
607	<	* created. For purposes of read-only access, a key may be read
608	<	* before a val, but can only be used after checking val to be
609	<	* non-null.
610	<	*/
611	<	static class Node {
612	<	volatile int hash;
613	<	final Object key;
512	<	volatile Object val;
513	<	volatile Node next;
602	>	* Key-value entry.  This class is never exported out as a
603	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
604	>	* MapEntry below), but can be used for read-only traversals used
605	>	* in bulk tasks.  Subclasses of Node with a negative hash field
606	>	* are special, and contain null keys and values (but are never
607	>	* exported).  Otherwise, keys and vals are never null.
608	>	*/
609	>	static class Node<K,V> implements Map.Entry<K,V> {
610	>	final int hash;
611	>	final K key;
612	>	volatile V val;
613	>	volatile Node<K,V> next;
614
615	<	Node(int hash, Object key, Object val, Node next) {
615	>	Node(int hash, K key, V val, Node<K,V> next) {
616		this.hash = hash;
617		this.key = key;
618		this.val = val;
619		this.next = next;
620		}
621
622	<	/** CompareAndSet the hash field */
623	<	final boolean casHash(int cmp, int val) {
624	<	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
625	<	}
626	<
627	<	/** The number of spins before blocking for a lock */
528	<	static final int MAX_SPINS =
529	<	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
530	<
531	<	/**
532	<	* Spins a while if LOCKED bit set and this node is the first
533	<	* of its bin, and then sets WAITING bits on hash field and
534	<	* blocks (once) if they are still set.  It is OK for this
535	<	* method to return even if lock is not available upon exit,
536	<	* which enables these simple single-wait mechanics.
537	<	*
538	<	* The corresponding signalling operation is performed within
539	<	* callers: Upon detecting that WAITING has been set when
540	<	* unlocking lock (via a failed CAS from non-waiting LOCKED
541	<	* state), unlockers acquire the sync lock and perform a
542	<	* notifyAll.
543	<	*
544	<	* The initial sanity check on tab and bounds is not currently
545	<	* necessary in the only usages of this method, but enables
546	<	* use in other future contexts.
547	<	*/
548	<	final void tryAwaitLock(Node[] tab, int i) {
549	<	if (tab != null && i >= 0 && i < tab.length) { // sanity check
550	<	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
551	<	int spins = MAX_SPINS, h;
552	<	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
553	<	if (spins >= 0) {
554	<	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
555	<	if (r >= 0 && --spins == 0)
556	<	Thread.yield();  // yield before block
557	<	}
558	<	else if (casHash(h, h | WAITING)) {
559	<	synchronized (this) {
560	<	if (tabAt(tab, i) == this &&
561	<	(hash & WAITING) == WAITING) {
562	<	try {
563	<	wait();
564	<	} catch (InterruptedException ie) {
565	<	Thread.currentThread().interrupt();
566	<	}
567	<	}
568	<	else
569	<	notifyAll(); // possibly won race vs signaller
570	<	}
571	<	break;
572	<	}
573	<	}
574	<	}
575	<	}
576	<
577	<	// Unsafe mechanics for casHash
578	<	private static final sun.misc.Unsafe UNSAFE;
579	<	private static final long hashOffset;
580	<
581	<	static {
582	<	try {
583	<	UNSAFE = getUnsafe();
584	<	Class<?> k = Node.class;
585	<	hashOffset = UNSAFE.objectFieldOffset
586	<	(k.getDeclaredField("hash"));
587	<	} catch (Exception e) {
588	<	throw new Error(e);
589	<	}
590	<	}
591	<	}
592	<
593	<	/* ---------------- TreeBins -------------- */
594	<
595	<	/**
596	<	* Nodes for use in TreeBins
597	<	*/
598	<	static final class TreeNode extends Node {
599	<	TreeNode parent;  // red-black tree links
600	<	TreeNode left;
601	<	TreeNode right;
602	<	TreeNode prev;    // needed to unlink next upon deletion
603	<	boolean red;
604	<
605	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
606	<	super(hash, key, val, next);
607	<	this.parent = parent;
608	<	}
609	<	}
610	<
611	<	/**
612	<	* A specialized form of red-black tree for use in bins
613	<	* whose size exceeds a threshold.
614	<	*
615	<	* TreeBins use a special form of comparison for search and
616	<	* related operations (which is the main reason we cannot use
617	<	* existing collections such as TreeMaps). TreeBins contain
618	<	* Comparable elements, but may contain others, as well as
619	<	* elements that are Comparable but not necessarily Comparable<T>
620	<	* for the same T, so we cannot invoke compareTo among them. To
621	<	* handle this, the tree is ordered primarily by hash value, then
622	<	* by getClass().getName() order, and then by Comparator order
623	<	* among elements of the same class.  On lookup at a node, if
624	<	* elements are not comparable or compare as 0, both left and
625	<	* right children may need to be searched in the case of tied hash
626	<	* values. (This corresponds to the full list search that would be
627	<	* necessary if all elements were non-Comparable and had tied
628	<	* hashes.)  The red-black balancing code is updated from
629	<	* pre-jdk-collections
630	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
631	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
632	<	* Algorithms" (CLR).
633	<	*
634	<	* TreeBins also maintain a separate locking discipline than
635	<	* regular bins. Because they are forwarded via special MOVED
636	<	* nodes at bin heads (which can never change once established),
637	<	* we cannot use those nodes as locks. Instead, TreeBin
638	<	* extends AbstractQueuedSynchronizer to support a simple form of
639	<	* read-write lock. For update operations and table validation,
640	<	* the exclusive form of lock behaves in the same way as bin-head
641	<	* locks. However, lookups use shared read-lock mechanics to allow
642	<	* multiple readers in the absence of writers.  Additionally,
643	<	* these lookups do not ever block: While the lock is not
644	<	* available, they proceed along the slow traversal path (via
645	<	* next-pointers) until the lock becomes available or the list is
646	<	* exhausted, whichever comes first. (These cases are not fast,
647	<	* but maximize aggregate expected throughput.)  The AQS mechanics
648	<	* for doing this are straightforward.  The lock state is held as
649	<	* AQS getState().  Read counts are negative; the write count (1)
650	<	* is positive.  There are no signalling preferences among readers
651	<	* and writers. Since we don't need to export full Lock API, we
652	<	* just override the minimal AQS methods and use them directly.
653	<	*/
654	<	static final class TreeBin extends AbstractQueuedSynchronizer {
655	<	private static final long serialVersionUID = 2249069246763182397L;
656	<	transient TreeNode root;  // root of tree
657	<	transient TreeNode first; // head of next-pointer list
658	<
659	<	/* AQS overrides */
660	<	public final boolean isHeldExclusively() { return getState() > 0; }
661	<	public final boolean tryAcquire(int ignore) {
662	<	if (compareAndSetState(0, 1)) {
663	<	setExclusiveOwnerThread(Thread.currentThread());
664	<	return true;
665	<	}
666	<	return false;
667	<	}
668	<	public final boolean tryRelease(int ignore) {
669	<	setExclusiveOwnerThread(null);
670	<	setState(0);
671	<	return true;
672	<	}
673	<	public final int tryAcquireShared(int ignore) {
674	<	for (int c;;) {
675	<	if ((c = getState()) > 0)
676	<	return -1;
677	<	if (compareAndSetState(c, c -1))
678	<	return 1;
679	<	}
680	<	}
681	<	public final boolean tryReleaseShared(int ignore) {
682	<	int c;
683	<	do {} while (!compareAndSetState(c = getState(), c + 1));
684	<	return c == -1;
685	<	}
686	<
687	<	/** From CLR */
688	<	private void rotateLeft(TreeNode p) {
689	<	if (p != null) {
690	<	TreeNode r = p.right, pp, rl;
691	<	if ((rl = p.right = r.left) != null)
692	<	rl.parent = p;
693	<	if ((pp = r.parent = p.parent) == null)
694	<	root = r;
695	<	else if (pp.left == p)
696	<	pp.left = r;
697	<	else
698	<	pp.right = r;
699	<	r.left = p;
700	<	p.parent = r;
701	<	}
702	<	}
703	<
704	<	/** From CLR */
705	<	private void rotateRight(TreeNode p) {
706	<	if (p != null) {
707	<	TreeNode l = p.left, pp, lr;
708	<	if ((lr = p.left = l.right) != null)
709	<	lr.parent = p;
710	<	if ((pp = l.parent = p.parent) == null)
711	<	root = l;
712	<	else if (pp.right == p)
713	<	pp.right = l;
714	<	else
715	<	pp.left = l;
716	<	l.right = p;
717	<	p.parent = l;
718	<	}
719	<	}
720	<
721	<	/**
722	<	* Returns the TreeNode (or null if not found) for the given key
723	<	* starting at given root.
724	<	*/
725	<	@SuppressWarnings("unchecked") final TreeNode getTreeNode
726	<	(int h, Object k, TreeNode p) {
727	<	Class<?> c = k.getClass();
728	<	while (p != null) {
729	<	int dir, ph;  Object pk; Class<?> pc;
730	<	if ((ph = p.hash) == h) {
731	<	if ((pk = p.key) == k || k.equals(pk))
732	<	return p;
733	<	if (c != (pc = pk.getClass()) ||
734	<	!(k instanceof Comparable) ||
735	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
736	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
737	<	TreeNode r = null, s = null, pl, pr;
738	<	if (dir >= 0) {
739	<	if ((pl = p.left) != null && h <= pl.hash)
740	<	s = pl;
741	<	}
742	<	else if ((pr = p.right) != null && h >= pr.hash)
743	<	s = pr;
744	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
745	<	return r;
746	<	}
747	<	}
748	<	else
749	<	dir = (h < ph) ? -1 : 1;
750	<	p = (dir > 0) ? p.right : p.left;
751	<	}
752	<	return null;
622	>	public final K getKey()       { return key; }
623	>	public final V getValue()     { return val; }
624	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
625	>	public final String toString(){ return key + "=" + val; }
626	>	public final V setValue(V value) {
627	>	throw new UnsupportedOperationException();
628		}
629
630	<	/**
631	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
632	<	* read-lock to call getTreeNode, but during failure to get
633	<	* lock, searches along next links.
634	<	*/
635	<	final Object getValue(int h, Object k) {
636	<	Node r = null;
762	<	int c = getState(); // Must read lock state first
763	<	for (Node e = first; e != null; e = e.next) {
764	<	if (c <= 0 && compareAndSetState(c, c - 1)) {
765	<	try {
766	<	r = getTreeNode(h, k, root);
767	<	} finally {
768	<	releaseShared(0);
769	<	}
770	<	break;
771	<	}
772	<	else if ((e.hash & HASH_BITS) == h && k.equals(e.key)) {
773	<	r = e;
774	<	break;
775	<	}
776	<	else
777	<	c = getState();
778	<	}
779	<	return r == null ? null : r.val;
630	>	public final boolean equals(Object o) {
631	>	Object k, v, u; Map.Entry<?,?> e;
632	>	return ((o instanceof Map.Entry) &&
633	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
634	>	(v = e.getValue()) != null &&
635	>	(k == key || k.equals(key)) &&
636	>	(v == (u = val) || v.equals(u)));
637		}
638
639		/**
640	<	* Finds or adds a node.
784	<	* @return null if added
640	>	* Virtualized support for map.get(); overridden in subclasses.
641		*/
642	<	@SuppressWarnings("unchecked") final TreeNode putTreeNode
643	<	(int h, Object k, Object v) {
644	<	Class<?> c = k.getClass();
645	<	TreeNode pp = root, p = null;
646	<	int dir = 0;
647	<	while (pp != null) { // find existing node or leaf to insert at
648	<	int ph;  Object pk; Class<?> pc;
649	<	p = pp;
650	<	if ((ph = p.hash) == h) {
795	<	if ((pk = p.key) == k || k.equals(pk))
796	<	return p;
797	<	if (c != (pc = pk.getClass()) ||
798	<	!(k instanceof Comparable) ||
799	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
800	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
801	<	TreeNode r = null, s = null, pl, pr;
802	<	if (dir >= 0) {
803	<	if ((pl = p.left) != null && h <= pl.hash)
804	<	s = pl;
805	<	}
806	<	else if ((pr = p.right) != null && h >= pr.hash)
807	<	s = pr;
808	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
809	<	return r;
810	<	}
811	<	}
812	<	else
813	<	dir = (h < ph) ? -1 : 1;
814	<	pp = (dir > 0) ? p.right : p.left;
815	<	}
816	<
817	<	TreeNode f = first;
818	<	TreeNode x = first = new TreeNode(h, k, v, f, p);
819	<	if (p == null)
820	<	root = x;
821	<	else { // attach and rebalance; adapted from CLR
822	<	TreeNode xp, xpp;
823	<	if (f != null)
824	<	f.prev = x;
825	<	if (dir <= 0)
826	<	p.left = x;
827	<	else
828	<	p.right = x;
829	<	x.red = true;
830	<	while (x != null && (xp = x.parent) != null && xp.red &&
831	<	(xpp = xp.parent) != null) {
832	<	TreeNode xppl = xpp.left;
833	<	if (xp == xppl) {
834	<	TreeNode y = xpp.right;
835	<	if (y != null && y.red) {
836	<	y.red = false;
837	<	xp.red = false;
838	<	xpp.red = true;
839	<	x = xpp;
840	<	}
841	<	else {
842	<	if (x == xp.right) {
843	<	rotateLeft(x = xp);
844	<	xpp = (xp = x.parent) == null ? null : xp.parent;
845	<	}
846	<	if (xp != null) {
847	<	xp.red = false;
848	<	if (xpp != null) {
849	<	xpp.red = true;
850	<	rotateRight(xpp);
851	<	}
852	<	}
853	<	}
854	<	}
855	<	else {
856	<	TreeNode y = xppl;
857	<	if (y != null && y.red) {
858	<	y.red = false;
859	<	xp.red = false;
860	<	xpp.red = true;
861	<	x = xpp;
862	<	}
863	<	else {
864	<	if (x == xp.left) {
865	<	rotateRight(x = xp);
866	<	xpp = (xp = x.parent) == null ? null : xp.parent;
867	<	}
868	<	if (xp != null) {
869	<	xp.red = false;
870	<	if (xpp != null) {
871	<	xpp.red = true;
872	<	rotateLeft(xpp);
873	<	}
874	<	}
875	<	}
876	<	}
877	<	}
878	<	TreeNode r = root;
879	<	if (r != null && r.red)
880	<	r.red = false;
642	>	Node<K,V> find(int h, Object k) {
643	>	Node<K,V> e = this;
644	>	if (k != null) {
645	>	do {
646	>	K ek;
647	>	if (e.hash == h &&
648	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
649	>	return e;
650	>	} while ((e = e.next) != null);
651		}
652		return null;
653		}
884	–
885	–	/**
886	–	* Removes the given node, that must be present before this
887	–	* call.  This is messier than typical red-black deletion code
888	–	* because we cannot swap the contents of an interior node
889	–	* with a leaf successor that is pinned by "next" pointers
890	–	* that are accessible independently of lock. So instead we
891	–	* swap the tree linkages.
892	–	*/
893	–	final void deleteTreeNode(TreeNode p) {
894	–	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
895	–	TreeNode pred = p.prev;
896	–	if (pred == null)
897	–	first = next;
898	–	else
899	–	pred.next = next;
900	–	if (next != null)
901	–	next.prev = pred;
902	–	TreeNode replacement;
903	–	TreeNode pl = p.left;
904	–	TreeNode pr = p.right;
905	–	if (pl != null && pr != null) {
906	–	TreeNode s = pr, sl;
907	–	while ((sl = s.left) != null) // find successor
908	–	s = sl;
909	–	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
910	–	TreeNode sr = s.right;
911	–	TreeNode pp = p.parent;
912	–	if (s == pr) { // p was s's direct parent
913	–	p.parent = s;
914	–	s.right = p;
915	–	}
916	–	else {
917	–	TreeNode sp = s.parent;
918	–	if ((p.parent = sp) != null) {
919	–	if (s == sp.left)
920	–	sp.left = p;
921	–	else
922	–	sp.right = p;
923	–	}
924	–	if ((s.right = pr) != null)
925	–	pr.parent = s;
926	–	}
927	–	p.left = null;
928	–	if ((p.right = sr) != null)
929	–	sr.parent = p;
930	–	if ((s.left = pl) != null)
931	–	pl.parent = s;
932	–	if ((s.parent = pp) == null)
933	–	root = s;
934	–	else if (p == pp.left)
935	–	pp.left = s;
936	–	else
937	–	pp.right = s;
938	–	replacement = sr;
939	–	}
940	–	else
941	–	replacement = (pl != null) ? pl : pr;
942	–	TreeNode pp = p.parent;
943	–	if (replacement == null) {
944	–	if (pp == null) {
945	–	root = null;
946	–	return;
947	–	}
948	–	replacement = p;
949	–	}
950	–	else {
951	–	replacement.parent = pp;
952	–	if (pp == null)
953	–	root = replacement;
954	–	else if (p == pp.left)
955	–	pp.left = replacement;
956	–	else
957	–	pp.right = replacement;
958	–	p.left = p.right = p.parent = null;
959	–	}
960	–	if (!p.red) { // rebalance, from CLR
961	–	TreeNode x = replacement;
962	–	while (x != null) {
963	–	TreeNode xp, xpl;
964	–	if (x.red || (xp = x.parent) == null) {
965	–	x.red = false;
966	–	break;
967	–	}
968	–	if (x == (xpl = xp.left)) {
969	–	TreeNode sib = xp.right;
970	–	if (sib != null && sib.red) {
971	–	sib.red = false;
972	–	xp.red = true;
973	–	rotateLeft(xp);
974	–	sib = (xp = x.parent) == null ? null : xp.right;
975	–	}
976	–	if (sib == null)
977	–	x = xp;
978	–	else {
979	–	TreeNode sl = sib.left, sr = sib.right;
980	–	if ((sr == null || !sr.red) &&
981	–	(sl == null || !sl.red)) {
982	–	sib.red = true;
983	–	x = xp;
984	–	}
985	–	else {
986	–	if (sr == null || !sr.red) {
987	–	if (sl != null)
988	–	sl.red = false;
989	–	sib.red = true;
990	–	rotateRight(sib);
991	–	sib = (xp = x.parent) == null ? null : xp.right;
992	–	}
993	–	if (sib != null) {
994	–	sib.red = (xp == null) ? false : xp.red;
995	–	if ((sr = sib.right) != null)
996	–	sr.red = false;
997	–	}
998	–	if (xp != null) {
999	–	xp.red = false;
1000	–	rotateLeft(xp);
1001	–	}
1002	–	x = root;
1003	–	}
1004	–	}
1005	–	}
1006	–	else { // symmetric
1007	–	TreeNode sib = xpl;
1008	–	if (sib != null && sib.red) {
1009	–	sib.red = false;
1010	–	xp.red = true;
1011	–	rotateRight(xp);
1012	–	sib = (xp = x.parent) == null ? null : xp.left;
1013	–	}
1014	–	if (sib == null)
1015	–	x = xp;
1016	–	else {
1017	–	TreeNode sl = sib.left, sr = sib.right;
1018	–	if ((sl == null || !sl.red) &&
1019	–	(sr == null || !sr.red)) {
1020	–	sib.red = true;
1021	–	x = xp;
1022	–	}
1023	–	else {
1024	–	if (sl == null || !sl.red) {
1025	–	if (sr != null)
1026	–	sr.red = false;
1027	–	sib.red = true;
1028	–	rotateLeft(sib);
1029	–	sib = (xp = x.parent) == null ? null : xp.left;
1030	–	}
1031	–	if (sib != null) {
1032	–	sib.red = (xp == null) ? false : xp.red;
1033	–	if ((sl = sib.left) != null)
1034	–	sl.red = false;
1035	–	}
1036	–	if (xp != null) {
1037	–	xp.red = false;
1038	–	rotateRight(xp);
1039	–	}
1040	–	x = root;
1041	–	}
1042	–	}
1043	–	}
1044	–	}
1045	–	}
1046	–	if (p == replacement && (pp = p.parent) != null) {
1047	–	if (p == pp.left) // detach pointers
1048	–	pp.left = null;
1049	–	else if (p == pp.right)
1050	–	pp.right = null;
1051	–	p.parent = null;
1052	–	}
1053	–	}
654		}
655
656	<	/* ---------------- Collision reduction methods -------------- */
656	>	/* ---------------- Static utilities -------------- */
657
658		/**
659	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
660	<	* Because the table uses power-of-two masking, sets of hashes
661	<	* that vary only in bits above the current mask will always
662	<	* collide. (Among known examples are sets of Float keys holding
663	<	* consecutive whole numbers in small tables.)  To counter this,
664	<	* we apply a transform that spreads the impact of higher bits
659	>	* Spreads (XORs) higher bits of hash to lower and also forces top
660	>	* bit to 0. Because the table uses power-of-two masking, sets of
661	>	* hashes that vary only in bits above the current mask will
662	>	* always collide. (Among known examples are sets of Float keys
663	>	* holding consecutive whole numbers in small tables.)  So we
664	>	* apply a transform that spreads the impact of higher bits
665		* downward. There is a tradeoff between speed, utility, and
666		* quality of bit-spreading. Because many common sets of hashes
667	<	* are already reasonably distributed across bits (so don't benefit
668	<	* from spreading), and because we use trees to handle large sets
669	<	* of collisions in bins, we don't need excessively high quality.
667	>	* are already reasonably distributed (so don't benefit from
668	>	* spreading), and because we use trees to handle large sets of
669	>	* collisions in bins, we just XOR some shifted bits in the
670	>	* cheapest possible way to reduce systematic lossage, as well as
671	>	* to incorporate impact of the highest bits that would otherwise
672	>	* never be used in index calculations because of table bounds.
673		*/
674	<	private static final int spread(int h) {
675	<	h ^= (h >>> 18) ^ (h >>> 12);
1073	<	return (h ^ (h >>> 10)) & HASH_BITS;
1074	<	}
1075	<
1076	<	/**
1077	<	* Replaces a list bin with a tree bin. Call only when locked.
1078	<	* Fails to replace if the given key is non-comparable or table
1079	<	* is, or needs, resizing.
1080	<	*/
1081	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
1082	<	if ((key instanceof Comparable) &&
1083	<	(tab.length >= MAXIMUM_CAPACITY || counter.sum() < (long)sizeCtl)) {
1084	<	TreeBin t = new TreeBin();
1085	<	for (Node e = tabAt(tab, index); e != null; e = e.next)
1086	<	t.putTreeNode(e.hash & HASH_BITS, e.key, e.val);
1087	<	setTabAt(tab, index, new Node(MOVED, t, null, null));
1088	<	}
1089	<	}
1090	<
1091	<	/* ---------------- Internal access and update methods -------------- */
1092	<
1093	<	/** Implementation for get and containsKey */
1094	<	private final Object internalGet(Object k) {
1095	<	int h = spread(k.hashCode());
1096	<	retry: for (Node[] tab = table; tab != null;) {
1097	<	Node e, p; Object ek, ev; int eh;      // locals to read fields once
1098	<	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1099	<	if ((eh = e.hash) == MOVED) {
1100	<	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1101	<	return ((TreeBin)ek).getValue(h, k);
1102	<	else {                        // restart with new table
1103	<	tab = (Node[])ek;
1104	<	continue retry;
1105	<	}
1106	<	}
1107	<	else if ((eh & HASH_BITS) == h && (ev = e.val) != null &&
1108	<	((ek = e.key) == k || k.equals(ek)))
1109	<	return ev;
1110	<	}
1111	<	break;
1112	<	}
1113	<	return null;
674	>	static final int spread(int h) {
675	>	return (h ^ (h >>> 16)) & HASH_BITS;
676		}
677
678		/**
1117	–	* Implementation for the four public remove/replace methods:
1118	–	* Replaces node value with v, conditional upon match of cv if
1119	–	* non-null.  If resulting value is null, delete.
1120	–	*/
1121	–	private final Object internalReplace(Object k, Object v, Object cv) {
1122	–	int h = spread(k.hashCode());
1123	–	Object oldVal = null;
1124	–	for (Node[] tab = table;;) {
1125	–	Node f; int i, fh; Object fk;
1126	–	if (tab == null ||
1127	–	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1128	–	break;
1129	–	else if ((fh = f.hash) == MOVED) {
1130	–	if ((fk = f.key) instanceof TreeBin) {
1131	–	TreeBin t = (TreeBin)fk;
1132	–	boolean validated = false;
1133	–	boolean deleted = false;
1134	–	t.acquire(0);
1135	–	try {
1136	–	if (tabAt(tab, i) == f) {
1137	–	validated = true;
1138	–	TreeNode p = t.getTreeNode(h, k, t.root);
1139	–	if (p != null) {
1140	–	Object pv = p.val;
1141	–	if (cv == null || cv == pv || cv.equals(pv)) {
1142	–	oldVal = pv;
1143	–	if ((p.val = v) == null) {
1144	–	deleted = true;
1145	–	t.deleteTreeNode(p);
1146	–	}
1147	–	}
1148	–	}
1149	–	}
1150	–	} finally {
1151	–	t.release(0);
1152	–	}
1153	–	if (validated) {
1154	–	if (deleted)
1155	–	counter.add(-1L);
1156	–	break;
1157	–	}
1158	–	}
1159	–	else
1160	–	tab = (Node[])fk;
1161	–	}
1162	–	else if ((fh & HASH_BITS) != h && f.next == null) // precheck
1163	–	break;                          // rules out possible existence
1164	–	else if ((fh & LOCKED) != 0) {
1165	–	checkForResize();               // try resizing if can't get lock
1166	–	f.tryAwaitLock(tab, i);
1167	–	}
1168	–	else if (f.casHash(fh, fh | LOCKED)) {
1169	–	boolean validated = false;
1170	–	boolean deleted = false;
1171	–	try {
1172	–	if (tabAt(tab, i) == f) {
1173	–	validated = true;
1174	–	for (Node e = f, pred = null;;) {
1175	–	Object ek, ev;
1176	–	if ((e.hash & HASH_BITS) == h &&
1177	–	((ev = e.val) != null) &&
1178	–	((ek = e.key) == k || k.equals(ek))) {
1179	–	if (cv == null || cv == ev || cv.equals(ev)) {
1180	–	oldVal = ev;
1181	–	if ((e.val = v) == null) {
1182	–	deleted = true;
1183	–	Node en = e.next;
1184	–	if (pred != null)
1185	–	pred.next = en;
1186	–	else
1187	–	setTabAt(tab, i, en);
1188	–	}
1189	–	}
1190	–	break;
1191	–	}
1192	–	pred = e;
1193	–	if ((e = e.next) == null)
1194	–	break;
1195	–	}
1196	–	}
1197	–	} finally {
1198	–	if (!f.casHash(fh | LOCKED, fh)) {
1199	–	f.hash = fh;
1200	–	synchronized (f) { f.notifyAll(); };
1201	–	}
1202	–	}
1203	–	if (validated) {
1204	–	if (deleted)
1205	–	counter.add(-1L);
1206	–	break;
1207	–	}
1208	–	}
1209	–	}
1210	–	return oldVal;
1211	–	}
1212	–
1213	–	/*
1214	–	* Internal versions of the six insertion methods, each a
1215	–	* little more complicated than the last. All have
1216	–	* the same basic structure as the first (internalPut):
1217	–	*  1. If table uninitialized, create
1218	–	*  2. If bin empty, try to CAS new node
1219	–	*  3. If bin stale, use new table
1220	–	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1221	–	*  5. Lock and validate; if valid, scan and add or update
1222	–	*
1223	–	* The others interweave other checks and/or alternative actions:
1224	–	*  * Plain put checks for and performs resize after insertion.
1225	–	*  * putIfAbsent prescans for mapping without lock (and fails to add
1226	–	*    if present), which also makes pre-emptive resize checks worthwhile.
1227	–	*  * computeIfAbsent extends form used in putIfAbsent with additional
1228	–	*    mechanics to deal with, calls, potential exceptions and null
1229	–	*    returns from function call.
1230	–	*  * compute uses the same function-call mechanics, but without
1231	–	*    the prescans
1232	–	*  * merge acts as putIfAbsent in the absent case, but invokes the
1233	–	*    update function if present
1234	–	*  * putAll attempts to pre-allocate enough table space
1235	–	*    and more lazily performs count updates and checks.
1236	–	*
1237	–	* Someday when details settle down a bit more, it might be worth
1238	–	* some factoring to reduce sprawl.
1239	–	*/
1240	–
1241	–	/** Implementation for put */
1242	–	private final Object internalPut(Object k, Object v) {
1243	–	int h = spread(k.hashCode());
1244	–	int count = 0;
1245	–	for (Node[] tab = table;;) {
1246	–	int i; Node f; int fh; Object fk;
1247	–	if (tab == null)
1248	–	tab = initTable();
1249	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1250	–	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1251	–	break;                   // no lock when adding to empty bin
1252	–	}
1253	–	else if ((fh = f.hash) == MOVED) {
1254	–	if ((fk = f.key) instanceof TreeBin) {
1255	–	TreeBin t = (TreeBin)fk;
1256	–	Object oldVal = null;
1257	–	t.acquire(0);
1258	–	try {
1259	–	if (tabAt(tab, i) == f) {
1260	–	count = 2;
1261	–	TreeNode p = t.putTreeNode(h, k, v);
1262	–	if (p != null) {
1263	–	oldVal = p.val;
1264	–	p.val = v;
1265	–	}
1266	–	}
1267	–	} finally {
1268	–	t.release(0);
1269	–	}
1270	–	if (count != 0) {
1271	–	if (oldVal != null)
1272	–	return oldVal;
1273	–	break;
1274	–	}
1275	–	}
1276	–	else
1277	–	tab = (Node[])fk;
1278	–	}
1279	–	else if ((fh & LOCKED) != 0) {
1280	–	checkForResize();
1281	–	f.tryAwaitLock(tab, i);
1282	–	}
1283	–	else if (f.casHash(fh, fh | LOCKED)) {
1284	–	Object oldVal = null;
1285	–	try {                        // needed in case equals() throws
1286	–	if (tabAt(tab, i) == f) {
1287	–	count = 1;
1288	–	for (Node e = f;; ++count) {
1289	–	Object ek, ev;
1290	–	if ((e.hash & HASH_BITS) == h &&
1291	–	(ev = e.val) != null &&
1292	–	((ek = e.key) == k || k.equals(ek))) {
1293	–	oldVal = ev;
1294	–	e.val = v;
1295	–	break;
1296	–	}
1297	–	Node last = e;
1298	–	if ((e = e.next) == null) {
1299	–	last.next = new Node(h, k, v, null);
1300	–	if (count >= TREE_THRESHOLD)
1301	–	replaceWithTreeBin(tab, i, k);
1302	–	break;
1303	–	}
1304	–	}
1305	–	}
1306	–	} finally {                  // unlock and signal if needed
1307	–	if (!f.casHash(fh | LOCKED, fh)) {
1308	–	f.hash = fh;
1309	–	synchronized (f) { f.notifyAll(); };
1310	–	}
1311	–	}
1312	–	if (count != 0) {
1313	–	if (oldVal != null)
1314	–	return oldVal;
1315	–	if (tab.length <= 64)
1316	–	count = 2;
1317	–	break;
1318	–	}
1319	–	}
1320	–	}
1321	–	counter.add(1L);
1322	–	if (count > 1)
1323	–	checkForResize();
1324	–	return null;
1325	–	}
1326	–
1327	–	/** Implementation for putIfAbsent */
1328	–	private final Object internalPutIfAbsent(Object k, Object v) {
1329	–	int h = spread(k.hashCode());
1330	–	int count = 0;
1331	–	for (Node[] tab = table;;) {
1332	–	int i; Node f; int fh; Object fk, fv;
1333	–	if (tab == null)
1334	–	tab = initTable();
1335	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1336	–	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1337	–	break;
1338	–	}
1339	–	else if ((fh = f.hash) == MOVED) {
1340	–	if ((fk = f.key) instanceof TreeBin) {
1341	–	TreeBin t = (TreeBin)fk;
1342	–	Object oldVal = null;
1343	–	t.acquire(0);
1344	–	try {
1345	–	if (tabAt(tab, i) == f) {
1346	–	count = 2;
1347	–	TreeNode p = t.putTreeNode(h, k, v);
1348	–	if (p != null)
1349	–	oldVal = p.val;
1350	–	}
1351	–	} finally {
1352	–	t.release(0);
1353	–	}
1354	–	if (count != 0) {
1355	–	if (oldVal != null)
1356	–	return oldVal;
1357	–	break;
1358	–	}
1359	–	}
1360	–	else
1361	–	tab = (Node[])fk;
1362	–	}
1363	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1364	–	((fk = f.key) == k || k.equals(fk)))
1365	–	return fv;
1366	–	else {
1367	–	Node g = f.next;
1368	–	if (g != null) { // at least 2 nodes -- search and maybe resize
1369	–	for (Node e = g;;) {
1370	–	Object ek, ev;
1371	–	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1372	–	((ek = e.key) == k || k.equals(ek)))
1373	–	return ev;
1374	–	if ((e = e.next) == null) {
1375	–	checkForResize();
1376	–	break;
1377	–	}
1378	–	}
1379	–	}
1380	–	if (((fh = f.hash) & LOCKED) != 0) {
1381	–	checkForResize();
1382	–	f.tryAwaitLock(tab, i);
1383	–	}
1384	–	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1385	–	Object oldVal = null;
1386	–	try {
1387	–	if (tabAt(tab, i) == f) {
1388	–	count = 1;
1389	–	for (Node e = f;; ++count) {
1390	–	Object ek, ev;
1391	–	if ((e.hash & HASH_BITS) == h &&
1392	–	(ev = e.val) != null &&
1393	–	((ek = e.key) == k || k.equals(ek))) {
1394	–	oldVal = ev;
1395	–	break;
1396	–	}
1397	–	Node last = e;
1398	–	if ((e = e.next) == null) {
1399	–	last.next = new Node(h, k, v, null);
1400	–	if (count >= TREE_THRESHOLD)
1401	–	replaceWithTreeBin(tab, i, k);
1402	–	break;
1403	–	}
1404	–	}
1405	–	}
1406	–	} finally {
1407	–	if (!f.casHash(fh | LOCKED, fh)) {
1408	–	f.hash = fh;
1409	–	synchronized (f) { f.notifyAll(); };
1410	–	}
1411	–	}
1412	–	if (count != 0) {
1413	–	if (oldVal != null)
1414	–	return oldVal;
1415	–	if (tab.length <= 64)
1416	–	count = 2;
1417	–	break;
1418	–	}
1419	–	}
1420	–	}
1421	–	}
1422	–	counter.add(1L);
1423	–	if (count > 1)
1424	–	checkForResize();
1425	–	return null;
1426	–	}
1427	–
1428	–	/** Implementation for computeIfAbsent */
1429	–	private final Object internalComputeIfAbsent(K k,
1430	–	Fun<? super K, ?> mf) {
1431	–	int h = spread(k.hashCode());
1432	–	Object val = null;
1433	–	int count = 0;
1434	–	for (Node[] tab = table;;) {
1435	–	Node f; int i, fh; Object fk, fv;
1436	–	if (tab == null)
1437	–	tab = initTable();
1438	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1439	–	Node node = new Node(fh = h | LOCKED, k, null, null);
1440	–	if (casTabAt(tab, i, null, node)) {
1441	–	count = 1;
1442	–	try {
1443	–	if ((val = mf.apply(k)) != null)
1444	–	node.val = val;
1445	–	} finally {
1446	–	if (val == null)
1447	–	setTabAt(tab, i, null);
1448	–	if (!node.casHash(fh, h)) {
1449	–	node.hash = h;
1450	–	synchronized (node) { node.notifyAll(); };
1451	–	}
1452	–	}
1453	–	}
1454	–	if (count != 0)
1455	–	break;
1456	–	}
1457	–	else if ((fh = f.hash) == MOVED) {
1458	–	if ((fk = f.key) instanceof TreeBin) {
1459	–	TreeBin t = (TreeBin)fk;
1460	–	boolean added = false;
1461	–	t.acquire(0);
1462	–	try {
1463	–	if (tabAt(tab, i) == f) {
1464	–	count = 1;
1465	–	TreeNode p = t.getTreeNode(h, k, t.root);
1466	–	if (p != null)
1467	–	val = p.val;
1468	–	else if ((val = mf.apply(k)) != null) {
1469	–	added = true;
1470	–	count = 2;
1471	–	t.putTreeNode(h, k, val);
1472	–	}
1473	–	}
1474	–	} finally {
1475	–	t.release(0);
1476	–	}
1477	–	if (count != 0) {
1478	–	if (!added)
1479	–	return val;
1480	–	break;
1481	–	}
1482	–	}
1483	–	else
1484	–	tab = (Node[])fk;
1485	–	}
1486	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1487	–	((fk = f.key) == k || k.equals(fk)))
1488	–	return fv;
1489	–	else {
1490	–	Node g = f.next;
1491	–	if (g != null) {
1492	–	for (Node e = g;;) {
1493	–	Object ek, ev;
1494	–	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1495	–	((ek = e.key) == k || k.equals(ek)))
1496	–	return ev;
1497	–	if ((e = e.next) == null) {
1498	–	checkForResize();
1499	–	break;
1500	–	}
1501	–	}
1502	–	}
1503	–	if (((fh = f.hash) & LOCKED) != 0) {
1504	–	checkForResize();
1505	–	f.tryAwaitLock(tab, i);
1506	–	}
1507	–	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1508	–	boolean added = false;
1509	–	try {
1510	–	if (tabAt(tab, i) == f) {
1511	–	count = 1;
1512	–	for (Node e = f;; ++count) {
1513	–	Object ek, ev;
1514	–	if ((e.hash & HASH_BITS) == h &&
1515	–	(ev = e.val) != null &&
1516	–	((ek = e.key) == k || k.equals(ek))) {
1517	–	val = ev;
1518	–	break;
1519	–	}
1520	–	Node last = e;
1521	–	if ((e = e.next) == null) {
1522	–	if ((val = mf.apply(k)) != null) {
1523	–	added = true;
1524	–	last.next = new Node(h, k, val, null);
1525	–	if (count >= TREE_THRESHOLD)
1526	–	replaceWithTreeBin(tab, i, k);
1527	–	}
1528	–	break;
1529	–	}
1530	–	}
1531	–	}
1532	–	} finally {
1533	–	if (!f.casHash(fh | LOCKED, fh)) {
1534	–	f.hash = fh;
1535	–	synchronized (f) { f.notifyAll(); };
1536	–	}
1537	–	}
1538	–	if (count != 0) {
1539	–	if (!added)
1540	–	return val;
1541	–	if (tab.length <= 64)
1542	–	count = 2;
1543	–	break;
1544	–	}
1545	–	}
1546	–	}
1547	–	}
1548	–	if (val != null) {
1549	–	counter.add(1L);
1550	–	if (count > 1)
1551	–	checkForResize();
1552	–	}
1553	–	return val;
1554	–	}
1555	–
1556	–	/** Implementation for compute */
1557	–	@SuppressWarnings("unchecked") private final Object internalCompute
1558	–	(K k, boolean onlyIfPresent, BiFun<? super K, ? super V, ? extends V> mf) {
1559	–	int h = spread(k.hashCode());
1560	–	Object val = null;
1561	–	int delta = 0;
1562	–	int count = 0;
1563	–	for (Node[] tab = table;;) {
1564	–	Node f; int i, fh; Object fk;
1565	–	if (tab == null)
1566	–	tab = initTable();
1567	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1568	–	if (onlyIfPresent)
1569	–	break;
1570	–	Node node = new Node(fh = h | LOCKED, k, null, null);
1571	–	if (casTabAt(tab, i, null, node)) {
1572	–	try {
1573	–	count = 1;
1574	–	if ((val = mf.apply(k, null)) != null) {
1575	–	node.val = val;
1576	–	delta = 1;
1577	–	}
1578	–	} finally {
1579	–	if (delta == 0)
1580	–	setTabAt(tab, i, null);
1581	–	if (!node.casHash(fh, h)) {
1582	–	node.hash = h;
1583	–	synchronized (node) { node.notifyAll(); };
1584	–	}
1585	–	}
1586	–	}
1587	–	if (count != 0)
1588	–	break;
1589	–	}
1590	–	else if ((fh = f.hash) == MOVED) {
1591	–	if ((fk = f.key) instanceof TreeBin) {
1592	–	TreeBin t = (TreeBin)fk;
1593	–	t.acquire(0);
1594	–	try {
1595	–	if (tabAt(tab, i) == f) {
1596	–	count = 1;
1597	–	TreeNode p = t.getTreeNode(h, k, t.root);
1598	–	Object pv = (p == null) ? null : p.val;
1599	–	if ((val = mf.apply(k, (V)pv)) != null) {
1600	–	if (p != null)
1601	–	p.val = val;
1602	–	else {
1603	–	count = 2;
1604	–	delta = 1;
1605	–	t.putTreeNode(h, k, val);
1606	–	}
1607	–	}
1608	–	else if (p != null) {
1609	–	delta = -1;
1610	–	t.deleteTreeNode(p);
1611	–	}
1612	–	}
1613	–	} finally {
1614	–	t.release(0);
1615	–	}
1616	–	if (count != 0)
1617	–	break;
1618	–	}
1619	–	else
1620	–	tab = (Node[])fk;
1621	–	}
1622	–	else if ((fh & LOCKED) != 0) {
1623	–	checkForResize();
1624	–	f.tryAwaitLock(tab, i);
1625	–	}
1626	–	else if (f.casHash(fh, fh | LOCKED)) {
1627	–	try {
1628	–	if (tabAt(tab, i) == f) {
1629	–	count = 1;
1630	–	for (Node e = f, pred = null;; ++count) {
1631	–	Object ek, ev;
1632	–	if ((e.hash & HASH_BITS) == h &&
1633	–	(ev = e.val) != null &&
1634	–	((ek = e.key) == k || k.equals(ek))) {
1635	–	val = mf.apply(k, (V)ev);
1636	–	if (val != null)
1637	–	e.val = val;
1638	–	else {
1639	–	delta = -1;
1640	–	Node en = e.next;
1641	–	if (pred != null)
1642	–	pred.next = en;
1643	–	else
1644	–	setTabAt(tab, i, en);
1645	–	}
1646	–	break;
1647	–	}
1648	–	pred = e;
1649	–	if ((e = e.next) == null) {
1650	–	if (!onlyIfPresent && (val = mf.apply(k, null)) != null) {
1651	–	pred.next = new Node(h, k, val, null);
1652	–	delta = 1;
1653	–	if (count >= TREE_THRESHOLD)
1654	–	replaceWithTreeBin(tab, i, k);
1655	–	}
1656	–	break;
1657	–	}
1658	–	}
1659	–	}
1660	–	} finally {
1661	–	if (!f.casHash(fh | LOCKED, fh)) {
1662	–	f.hash = fh;
1663	–	synchronized (f) { f.notifyAll(); };
1664	–	}
1665	–	}
1666	–	if (count != 0) {
1667	–	if (tab.length <= 64)
1668	–	count = 2;
1669	–	break;
1670	–	}
1671	–	}
1672	–	}
1673	–	if (delta != 0) {
1674	–	counter.add((long)delta);
1675	–	if (count > 1)
1676	–	checkForResize();
1677	–	}
1678	–	return val;
1679	–	}
1680	–
1681	–	/** Implementation for merge */
1682	–	@SuppressWarnings("unchecked") private final Object internalMerge
1683	–	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
1684	–	int h = spread(k.hashCode());
1685	–	Object val = null;
1686	–	int delta = 0;
1687	–	int count = 0;
1688	–	for (Node[] tab = table;;) {
1689	–	int i; Node f; int fh; Object fk, fv;
1690	–	if (tab == null)
1691	–	tab = initTable();
1692	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1693	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1694	–	delta = 1;
1695	–	val = v;
1696	–	break;
1697	–	}
1698	–	}
1699	–	else if ((fh = f.hash) == MOVED) {
1700	–	if ((fk = f.key) instanceof TreeBin) {
1701	–	TreeBin t = (TreeBin)fk;
1702	–	t.acquire(0);
1703	–	try {
1704	–	if (tabAt(tab, i) == f) {
1705	–	count = 1;
1706	–	TreeNode p = t.getTreeNode(h, k, t.root);
1707	–	val = (p == null) ? v : mf.apply((V)p.val, v);
1708	–	if (val != null) {
1709	–	if (p != null)
1710	–	p.val = val;
1711	–	else {
1712	–	count = 2;
1713	–	delta = 1;
1714	–	t.putTreeNode(h, k, val);
1715	–	}
1716	–	}
1717	–	else if (p != null) {
1718	–	delta = -1;
1719	–	t.deleteTreeNode(p);
1720	–	}
1721	–	}
1722	–	} finally {
1723	–	t.release(0);
1724	–	}
1725	–	if (count != 0)
1726	–	break;
1727	–	}
1728	–	else
1729	–	tab = (Node[])fk;
1730	–	}
1731	–	else if ((fh & LOCKED) != 0) {
1732	–	checkForResize();
1733	–	f.tryAwaitLock(tab, i);
1734	–	}
1735	–	else if (f.casHash(fh, fh | LOCKED)) {
1736	–	try {
1737	–	if (tabAt(tab, i) == f) {
1738	–	count = 1;
1739	–	for (Node e = f, pred = null;; ++count) {
1740	–	Object ek, ev;
1741	–	if ((e.hash & HASH_BITS) == h &&
1742	–	(ev = e.val) != null &&
1743	–	((ek = e.key) == k || k.equals(ek))) {
1744	–	val = mf.apply(v, (V)ev);
1745	–	if (val != null)
1746	–	e.val = val;
1747	–	else {
1748	–	delta = -1;
1749	–	Node en = e.next;
1750	–	if (pred != null)
1751	–	pred.next = en;
1752	–	else
1753	–	setTabAt(tab, i, en);
1754	–	}
1755	–	break;
1756	–	}
1757	–	pred = e;
1758	–	if ((e = e.next) == null) {
1759	–	val = v;
1760	–	pred.next = new Node(h, k, val, null);
1761	–	delta = 1;
1762	–	if (count >= TREE_THRESHOLD)
1763	–	replaceWithTreeBin(tab, i, k);
1764	–	break;
1765	–	}
1766	–	}
1767	–	}
1768	–	} finally {
1769	–	if (!f.casHash(fh | LOCKED, fh)) {
1770	–	f.hash = fh;
1771	–	synchronized (f) { f.notifyAll(); };
1772	–	}
1773	–	}
1774	–	if (count != 0) {
1775	–	if (tab.length <= 64)
1776	–	count = 2;
1777	–	break;
1778	–	}
1779	–	}
1780	–	}
1781	–	if (delta != 0) {
1782	–	counter.add((long)delta);
1783	–	if (count > 1)
1784	–	checkForResize();
1785	–	}
1786	–	return val;
1787	–	}
1788	–
1789	–	/** Implementation for putAll */
1790	–	private final void internalPutAll(Map<?, ?> m) {
1791	–	tryPresize(m.size());
1792	–	long delta = 0L;     // number of uncommitted additions
1793	–	boolean npe = false; // to throw exception on exit for nulls
1794	–	try {                // to clean up counts on other exceptions
1795	–	for (Map.Entry<?, ?> entry : m.entrySet()) {
1796	–	Object k, v;
1797	–	if (entry == null || (k = entry.getKey()) == null ||
1798	–	(v = entry.getValue()) == null) {
1799	–	npe = true;
1800	–	break;
1801	–	}
1802	–	int h = spread(k.hashCode());
1803	–	for (Node[] tab = table;;) {
1804	–	int i; Node f; int fh; Object fk;
1805	–	if (tab == null)
1806	–	tab = initTable();
1807	–	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
1808	–	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1809	–	++delta;
1810	–	break;
1811	–	}
1812	–	}
1813	–	else if ((fh = f.hash) == MOVED) {
1814	–	if ((fk = f.key) instanceof TreeBin) {
1815	–	TreeBin t = (TreeBin)fk;
1816	–	boolean validated = false;
1817	–	t.acquire(0);
1818	–	try {
1819	–	if (tabAt(tab, i) == f) {
1820	–	validated = true;
1821	–	TreeNode p = t.getTreeNode(h, k, t.root);
1822	–	if (p != null)
1823	–	p.val = v;
1824	–	else {
1825	–	t.putTreeNode(h, k, v);
1826	–	++delta;
1827	–	}
1828	–	}
1829	–	} finally {
1830	–	t.release(0);
1831	–	}
1832	–	if (validated)
1833	–	break;
1834	–	}
1835	–	else
1836	–	tab = (Node[])fk;
1837	–	}
1838	–	else if ((fh & LOCKED) != 0) {
1839	–	counter.add(delta);
1840	–	delta = 0L;
1841	–	checkForResize();
1842	–	f.tryAwaitLock(tab, i);
1843	–	}
1844	–	else if (f.casHash(fh, fh | LOCKED)) {
1845	–	int count = 0;
1846	–	try {
1847	–	if (tabAt(tab, i) == f) {
1848	–	count = 1;
1849	–	for (Node e = f;; ++count) {
1850	–	Object ek, ev;
1851	–	if ((e.hash & HASH_BITS) == h &&
1852	–	(ev = e.val) != null &&
1853	–	((ek = e.key) == k || k.equals(ek))) {
1854	–	e.val = v;
1855	–	break;
1856	–	}
1857	–	Node last = e;
1858	–	if ((e = e.next) == null) {
1859	–	++delta;
1860	–	last.next = new Node(h, k, v, null);
1861	–	if (count >= TREE_THRESHOLD)
1862	–	replaceWithTreeBin(tab, i, k);
1863	–	break;
1864	–	}
1865	–	}
1866	–	}
1867	–	} finally {
1868	–	if (!f.casHash(fh | LOCKED, fh)) {
1869	–	f.hash = fh;
1870	–	synchronized (f) { f.notifyAll(); };
1871	–	}
1872	–	}
1873	–	if (count != 0) {
1874	–	if (count > 1) {
1875	–	counter.add(delta);
1876	–	delta = 0L;
1877	–	checkForResize();
1878	–	}
1879	–	break;
1880	–	}
1881	–	}
1882	–	}
1883	–	}
1884	–	} finally {
1885	–	if (delta != 0)
1886	–	counter.add(delta);
1887	–	}
1888	–	if (npe)
1889	–	throw new NullPointerException();
1890	–	}
1891	–
1892	–	/* ---------------- Table Initialization and Resizing -------------- */
1893	–
1894	–	/**
679		* Returns a power of two table size for the given desired capacity.
680		* See Hackers Delight, sec 3.2
681		*/
#	Line 1906 | Line 690 | public class ConcurrentHashMapV8<K, V>
690		}
691
692		/**
693	<	* Initializes table, using the size recorded in sizeCtl.
693	>	* Returns x's Class if it is of the form "class C implements
694	>	* Comparable<C>", else null.
695		*/
696	<	private final Node[] initTable() {
697	<	Node[] tab; int sc;
698	<	while ((tab = table) == null) {
699	<	if ((sc = sizeCtl) < 0)
700	<	Thread.yield(); // lost initialization race; just spin
701	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
702	<	try {
703	<	if ((tab = table) == null) {
704	<	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
705	<	tab = table = new Node[n];
706	<	sc = n - (n >>> 2);
707	<	}
708	<	} finally {
1924	<	sizeCtl = sc;
1925	<	}
1926	<	break;
1927	<	}
1928	<	}
1929	<	return tab;
1930	<	}
1931	<
1932	<	/**
1933	<	* If table is too small and not already resizing, creates next
1934	<	* table and transfers bins.  Rechecks occupancy after a transfer
1935	<	* to see if another resize is already needed because resizings
1936	<	* are lagging additions.
1937	<	*/
1938	<	private final void checkForResize() {
1939	<	Node[] tab; int n, sc;
1940	<	while ((tab = table) != null &&
1941	<	(n = tab.length) < MAXIMUM_CAPACITY &&
1942	<	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
1943	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1944	<	try {
1945	<	if (tab == table) {
1946	<	table = rebuild(tab);
1947	<	sc = (n << 1) - (n >>> 1);
696	>	static Class<?> comparableClassFor(Object x) {
697	>	if (x instanceof Comparable) {
698	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
699	>	if ((c = x.getClass()) == String.class) // bypass checks
700	>	return c;
701	>	if ((ts = c.getGenericInterfaces()) != null) {
702	>	for (int i = 0; i < ts.length; ++i) {
703	>	if (((t = ts[i]) instanceof ParameterizedType) &&
704	>	((p = (ParameterizedType)t).getRawType() ==
705	>	Comparable.class) &&
706	>	(as = p.getActualTypeArguments()) != null &&
707	>	as.length == 1 && as[0] == c) // type arg is c
708	>	return c;
709		}
1949	–	} finally {
1950	–	sizeCtl = sc;
710		}
711		}
712	+	return null;
713		}
714
715		/**
716	<	* Tries to presize table to accommodate the given number of elements.
717	<	*
1958	<	* @param size number of elements (doesn't need to be perfectly accurate)
716	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
717	>	* class), else 0.
718		*/
719	<	private final void tryPresize(int size) {
720	<	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
721	<	tableSizeFor(size + (size >>> 1) + 1);
722	<	int sc;
1964	<	while ((sc = sizeCtl) >= 0) {
1965	<	Node[] tab = table; int n;
1966	<	if (tab == null || (n = tab.length) == 0) {
1967	<	n = (sc > c) ? sc : c;
1968	<	if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1969	<	try {
1970	<	if (table == tab) {
1971	<	table = new Node[n];
1972	<	sc = n - (n >>> 2);
1973	<	}
1974	<	} finally {
1975	<	sizeCtl = sc;
1976	<	}
1977	<	}
1978	<	}
1979	<	else if (c <= sc || n >= MAXIMUM_CAPACITY)
1980	<	break;
1981	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1982	<	try {
1983	<	if (table == tab) {
1984	<	table = rebuild(tab);
1985	<	sc = (n << 1) - (n >>> 1);
1986	<	}
1987	<	} finally {
1988	<	sizeCtl = sc;
1989	<	}
1990	<	}
1991	<	}
719	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
720	>	static int compareComparables(Class<?> kc, Object k, Object x) {
721	>	return (x == null || x.getClass() != kc ? 0 :
722	>	((Comparable)k).compareTo(x));
723		}
724
725	+	/* ---------------- Table element access -------------- */
726	+
727		/*
728	<	* Moves and/or copies the nodes in each bin to new table. See
729	<	* above for explanation.
730	<	*
731	<	* @return the new table
732	<	*/
733	<	private static final Node[] rebuild(Node[] tab) {
734	<	int n = tab.length;
735	<	Node[] nextTab = new Node[n << 1];
736	<	Node fwd = new Node(MOVED, nextTab, null, null);
737	<	int[] buffer = null;       // holds bins to revisit; null until needed
738	<	Node rev = null;           // reverse forwarder; null until needed
739	<	int nbuffered = 0;         // the number of bins in buffer list
740	<	int bufferIndex = 0;       // buffer index of current buffered bin
741	<	int bin = n - 1;           // current non-buffered bin or -1 if none
742	<
743	<	for (int i = bin;;) {      // start upwards sweep
744	<	int fh; Node f;
745	<	if ((f = tabAt(tab, i)) == null) {
746	<	if (bin >= 0) {    // Unbuffered; no lock needed (or available)
747	<	if (!casTabAt(tab, i, f, fwd))
748	<	continue;
749	<	}
750	<	else {             // transiently use a locked forwarding node
2018	<	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
2019	<	if (!casTabAt(tab, i, f, g))
2020	<	continue;
2021	<	setTabAt(nextTab, i, null);
2022	<	setTabAt(nextTab, i + n, null);
2023	<	setTabAt(tab, i, fwd);
2024	<	if (!g.casHash(MOVED|LOCKED, MOVED)) {
2025	<	g.hash = MOVED;
2026	<	synchronized (g) { g.notifyAll(); }
2027	<	}
2028	<	}
2029	<	}
2030	<	else if ((fh = f.hash) == MOVED) {
2031	<	Object fk = f.key;
2032	<	if (fk instanceof TreeBin) {
2033	<	TreeBin t = (TreeBin)fk;
2034	<	boolean validated = false;
2035	<	t.acquire(0);
2036	<	try {
2037	<	if (tabAt(tab, i) == f) {
2038	<	validated = true;
2039	<	splitTreeBin(nextTab, i, t);
2040	<	setTabAt(tab, i, fwd);
2041	<	}
2042	<	} finally {
2043	<	t.release(0);
2044	<	}
2045	<	if (!validated)
2046	<	continue;
2047	<	}
2048	<	}
2049	<	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
2050	<	boolean validated = false;
2051	<	try {              // split to lo and hi lists; copying as needed
2052	<	if (tabAt(tab, i) == f) {
2053	<	validated = true;
2054	<	splitBin(nextTab, i, f);
2055	<	setTabAt(tab, i, fwd);
2056	<	}
2057	<	} finally {
2058	<	if (!f.casHash(fh | LOCKED, fh)) {
2059	<	f.hash = fh;
2060	<	synchronized (f) { f.notifyAll(); };
2061	<	}
2062	<	}
2063	<	if (!validated)
2064	<	continue;
2065	<	}
2066	<	else {
2067	<	if (buffer == null) // initialize buffer for revisits
2068	<	buffer = new int[TRANSFER_BUFFER_SIZE];
2069	<	if (bin < 0 && bufferIndex > 0) {
2070	<	int j = buffer[--bufferIndex];
2071	<	buffer[bufferIndex] = i;
2072	<	i = j;         // swap with another bin
2073	<	continue;
2074	<	}
2075	<	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
2076	<	f.tryAwaitLock(tab, i);
2077	<	continue;      // no other options -- block
2078	<	}
2079	<	if (rev == null)   // initialize reverse-forwarder
2080	<	rev = new Node(MOVED, tab, null, null);
2081	<	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
2082	<	continue;      // recheck before adding to list
2083	<	buffer[nbuffered++] = i;
2084	<	setTabAt(nextTab, i, rev);     // install place-holders
2085	<	setTabAt(nextTab, i + n, rev);
2086	<	}
2087	<
2088	<	if (bin > 0)
2089	<	i = --bin;
2090	<	else if (buffer != null && nbuffered > 0) {
2091	<	bin = -1;
2092	<	i = buffer[bufferIndex = --nbuffered];
2093	<	}
2094	<	else
2095	<	return nextTab;
2096	<	}
728	>	* Volatile access methods are used for table elements as well as
729	>	* elements of in-progress next table while resizing.  All uses of
730	>	* the tab arguments must be null checked by callers.  All callers
731	>	* also paranoically precheck that tab's length is not zero (or an
732	>	* equivalent check), thus ensuring that any index argument taking
733	>	* the form of a hash value anded with (length - 1) is a valid
734	>	* index.  Note that, to be correct wrt arbitrary concurrency
735	>	* errors by users, these checks must operate on local variables,
736	>	* which accounts for some odd-looking inline assignments below.
737	>	* Note that calls to setTabAt always occur within locked regions,
738	>	* and so in principle require only release ordering, not need
739	>	* full volatile semantics, but are currently coded as volatile
740	>	* writes to be conservative.
741	>	*/
742	>
743	>	@SuppressWarnings("unchecked")
744	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
745	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
746	>	}
747	>
748	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
749	>	Node<K,V> c, Node<K,V> v) {
750	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
751		}
752
753	<	/**
754	<	* Splits a normal bin with list headed by e into lo and hi parts;
2101	<	* installs in given table.
2102	<	*/
2103	<	private static void splitBin(Node[] nextTab, int i, Node e) {
2104	<	int bit = nextTab.length >>> 1; // bit to split on
2105	<	int runBit = e.hash & bit;
2106	<	Node lastRun = e, lo = null, hi = null;
2107	<	for (Node p = e.next; p != null; p = p.next) {
2108	<	int b = p.hash & bit;
2109	<	if (b != runBit) {
2110	<	runBit = b;
2111	<	lastRun = p;
2112	<	}
2113	<	}
2114	<	if (runBit == 0)
2115	<	lo = lastRun;
2116	<	else
2117	<	hi = lastRun;
2118	<	for (Node p = e; p != lastRun; p = p.next) {
2119	<	int ph = p.hash & HASH_BITS;
2120	<	Object pk = p.key, pv = p.val;
2121	<	if ((ph & bit) == 0)
2122	<	lo = new Node(ph, pk, pv, lo);
2123	<	else
2124	<	hi = new Node(ph, pk, pv, hi);
2125	<	}
2126	<	setTabAt(nextTab, i, lo);
2127	<	setTabAt(nextTab, i + bit, hi);
753	>	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
754	>	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
755		}
756
757	+	/* ---------------- Fields -------------- */
758	+
759		/**
760	<	* Splits a tree bin into lo and hi parts; installs in given table.
760	>	* The array of bins. Lazily initialized upon first insertion.
761	>	* Size is always a power of two. Accessed directly by iterators.
762		*/
763	<	private static void splitTreeBin(Node[] nextTab, int i, TreeBin t) {
2134	<	int bit = nextTab.length >>> 1;
2135	<	TreeBin lt = new TreeBin();
2136	<	TreeBin ht = new TreeBin();
2137	<	int lc = 0, hc = 0;
2138	<	for (Node e = t.first; e != null; e = e.next) {
2139	<	int h = e.hash & HASH_BITS;
2140	<	Object k = e.key, v = e.val;
2141	<	if ((h & bit) == 0) {
2142	<	++lc;
2143	<	lt.putTreeNode(h, k, v);
2144	<	}
2145	<	else {
2146	<	++hc;
2147	<	ht.putTreeNode(h, k, v);
2148	<	}
2149	<	}
2150	<	Node ln, hn; // throw away trees if too small
2151	<	if (lc <= (TREE_THRESHOLD >>> 1)) {
2152	<	ln = null;
2153	<	for (Node p = lt.first; p != null; p = p.next)
2154	<	ln = new Node(p.hash, p.key, p.val, ln);
2155	<	}
2156	<	else
2157	<	ln = new Node(MOVED, lt, null, null);
2158	<	setTabAt(nextTab, i, ln);
2159	<	if (hc <= (TREE_THRESHOLD >>> 1)) {
2160	<	hn = null;
2161	<	for (Node p = ht.first; p != null; p = p.next)
2162	<	hn = new Node(p.hash, p.key, p.val, hn);
2163	<	}
2164	<	else
2165	<	hn = new Node(MOVED, ht, null, null);
2166	<	setTabAt(nextTab, i + bit, hn);
2167	<	}
763	>	transient volatile Node<K,V>[] table;
764
765		/**
766	<	* Implementation for clear. Steps through each bin, removing all
2171	<	* nodes.
766	>	* The next table to use; non-null only while resizing.
767		*/
768	<	private final void internalClear() {
2174	<	long delta = 0L; // negative number of deletions
2175	<	int i = 0;
2176	<	Node[] tab = table;
2177	<	while (tab != null && i < tab.length) {
2178	<	int fh; Object fk;
2179	<	Node f = tabAt(tab, i);
2180	<	if (f == null)
2181	<	++i;
2182	<	else if ((fh = f.hash) == MOVED) {
2183	<	if ((fk = f.key) instanceof TreeBin) {
2184	<	TreeBin t = (TreeBin)fk;
2185	<	t.acquire(0);
2186	<	try {
2187	<	if (tabAt(tab, i) == f) {
2188	<	for (Node p = t.first; p != null; p = p.next) {
2189	<	if (p.val != null) { // (currently always true)
2190	<	p.val = null;
2191	<	--delta;
2192	<	}
2193	<	}
2194	<	t.first = null;
2195	<	t.root = null;
2196	<	++i;
2197	<	}
2198	<	} finally {
2199	<	t.release(0);
2200	<	}
2201	<	}
2202	<	else
2203	<	tab = (Node[])fk;
2204	<	}
2205	<	else if ((fh & LOCKED) != 0) {
2206	<	counter.add(delta); // opportunistically update count
2207	<	delta = 0L;
2208	<	f.tryAwaitLock(tab, i);
2209	<	}
2210	<	else if (f.casHash(fh, fh | LOCKED)) {
2211	<	try {
2212	<	if (tabAt(tab, i) == f) {
2213	<	for (Node e = f; e != null; e = e.next) {
2214	<	if (e.val != null) {  // (currently always true)
2215	<	e.val = null;
2216	<	--delta;
2217	<	}
2218	<	}
2219	<	setTabAt(tab, i, null);
2220	<	++i;
2221	<	}
2222	<	} finally {
2223	<	if (!f.casHash(fh | LOCKED, fh)) {
2224	<	f.hash = fh;
2225	<	synchronized (f) { f.notifyAll(); };
2226	<	}
2227	<	}
2228	<	}
2229	<	}
2230	<	if (delta != 0)
2231	<	counter.add(delta);
2232	<	}
2233	<
2234	<	/* ----------------Table Traversal -------------- */
768	>	private transient volatile Node<K,V>[] nextTable;
769
770		/**
771	<	* Encapsulates traversal for methods such as containsValue; also
772	<	* serves as a base class for other iterators and bulk tasks.
773	<	*
774	<	* At each step, the iterator snapshots the key ("nextKey") and
775	<	* value ("nextVal") of a valid node (i.e., one that, at point of
2242	<	* snapshot, has a non-null user value). Because val fields can
2243	<	* change (including to null, indicating deletion), field nextVal
2244	<	* might not be accurate at point of use, but still maintains the
2245	<	* weak consistency property of holding a value that was once
2246	<	* valid.
2247	<	*
2248	<	* Internal traversals directly access these fields, as in:
2249	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2250	<	*
2251	<	* Exported iterators must track whether the iterator has advanced
2252	<	* (in hasNext vs next) (by setting/checking/nulling field
2253	<	* nextVal), and then extract key, value, or key-value pairs as
2254	<	* return values of next().
2255	<	*
2256	<	* The iterator visits once each still-valid node that was
2257	<	* reachable upon iterator construction. It might miss some that
2258	<	* were added to a bin after the bin was visited, which is OK wrt
2259	<	* consistency guarantees. Maintaining this property in the face
2260	<	* of possible ongoing resizes requires a fair amount of
2261	<	* bookkeeping state that is difficult to optimize away amidst
2262	<	* volatile accesses.  Even so, traversal maintains reasonable
2263	<	* throughput.
2264	<	*
2265	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2266	<	* However, if the table has been resized, then all future steps
2267	<	* must traverse both the bin at the current index as well as at
2268	<	* (index + baseSize); and so on for further resizings. To
2269	<	* paranoically cope with potential sharing by users of iterators
2270	<	* across threads, iteration terminates if a bounds checks fails
2271	<	* for a table read.
2272	<	*
2273	<	* This class extends ForkJoinTask to streamline parallel
2274	<	* iteration in bulk operations (see BulkTask). This adds only an
2275	<	* int of space overhead, which is close enough to negligible in
2276	<	* cases where it is not needed to not worry about it.  Because
2277	<	* ForkJoinTask is Serializable, but iterators need not be, we
2278	<	* need to add warning suppressions.
2279	<	*/
2280	<	@SuppressWarnings("serial") static class Traverser<K,V,R> extends ForkJoinTask<R> {
2281	<	final ConcurrentHashMapV8<K, V> map;
2282	<	Node next;           // the next entry to use
2283	<	Node last;           // the last entry used
2284	<	Object nextKey;      // cached key field of next
2285	<	Object nextVal;      // cached val field of next
2286	<	Node[] tab;          // current table; updated if resized
2287	<	int index;           // index of bin to use next
2288	<	int baseIndex;       // current index of initial table
2289	<	int baseLimit;       // index bound for initial table
2290	<	int baseSize;        // initial table size
771	>	* Base counter value, used mainly when there is no contention,
772	>	* but also as a fallback during table initialization
773	>	* races. Updated via CAS.
774	>	*/
775	>	private transient volatile long baseCount;
776
777	<	/** Creates iterator for all entries in the table. */
778	<	Traverser(ConcurrentHashMapV8<K, V> map) {
779	<	this.map = map;
780	<	}
777	>	/**
778	>	* Table initialization and resizing control.  When negative, the
779	>	* table is being initialized or resized: -1 for initialization,
780	>	* else -(1 + the number of active resizing threads).  Otherwise,
781	>	* when table is null, holds the initial table size to use upon
782	>	* creation, or 0 for default. After initialization, holds the
783	>	* next element count value upon which to resize the table.
784	>	*/
785	>	private transient volatile int sizeCtl;
786
787	<	/** Creates iterator for split() methods */
788	<	Traverser(Traverser<K,V,?> it) {
789	<	ConcurrentHashMapV8<K, V> m; Node[] t;
790	<	if ((m = this.map = it.map) == null)
2301	<	t = null;
2302	<	else if ((t = it.tab) == null && // force parent tab initialization
2303	<	(t = it.tab = m.table) != null)
2304	<	it.baseLimit = it.baseSize = t.length;
2305	<	this.tab = t;
2306	<	this.baseSize = it.baseSize;
2307	<	it.baseLimit = this.index = this.baseIndex =
2308	<	((this.baseLimit = it.baseLimit) + it.baseIndex + 1) >>> 1;
2309	<	}
787	>	/**
788	>	* The next table index (plus one) to split while resizing.
789	>	*/
790	>	private transient volatile int transferIndex;
791
792	<	/**
793	<	* Advances next; returns nextVal or null if terminated.
794	<	* See above for explanation.
795	<	*/
2315	<	final Object advance() {
2316	<	Node e = last = next;
2317	<	Object ev = null;
2318	<	outer: do {
2319	<	if (e != null)                  // advance past used/skipped node
2320	<	e = e.next;
2321	<	while (e == null) {             // get to next non-null bin
2322	<	ConcurrentHashMapV8<K, V> m;
2323	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2324	<	if ((t = tab) != null)
2325	<	n = t.length;
2326	<	else if ((m = map) != null && (t = tab = m.table) != null)
2327	<	n = baseLimit = baseSize = t.length;
2328	<	else
2329	<	break outer;
2330	<	if ((b = baseIndex) >= baseLimit ||
2331	<	(i = index) < 0 || i >= n)
2332	<	break outer;
2333	<	if ((e = tabAt(t, i)) != null && e.hash == MOVED) {
2334	<	if ((ek = e.key) instanceof TreeBin)
2335	<	e = ((TreeBin)ek).first;
2336	<	else {
2337	<	tab = (Node[])ek;
2338	<	continue;           // restarts due to null val
2339	<	}
2340	<	}                           // visit upper slots if present
2341	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2342	<	}
2343	<	nextKey = e.key;
2344	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2345	<	next = e;
2346	<	return nextVal = ev;
2347	<	}
792	>	/**
793	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
794	>	*/
795	>	private transient volatile int cellsBusy;
796
797	<	public final void remove() {
798	<	if (nextVal == null && last == null)
799	<	advance();
800	<	Node e = last;
2353	<	if (e == null)
2354	<	throw new IllegalStateException();
2355	<	last = null;
2356	<	map.remove(e.key);
2357	<	}
797	>	/**
798	>	* Table of counter cells. When non-null, size is a power of 2.
799	>	*/
800	>	private transient volatile CounterCell[] counterCells;
801
802	<	public final boolean hasNext() {
803	<	return nextVal != null || advance() != null;
804	<	}
802	>	// views
803	>	private transient KeySetView<K,V> keySet;
804	>	private transient ValuesView<K,V> values;
805	>	private transient EntrySetView<K,V> entrySet;
806
2363	–	public final boolean hasMoreElements() { return hasNext(); }
2364	–	public final void setRawResult(Object x) { }
2365	–	public R getRawResult() { return null; }
2366	–	public boolean exec() { return true; }
2367	–	}
807
808		/* ---------------- Public operations -------------- */
809
#	Line 2372 | Line 811 | public class ConcurrentHashMapV8<K, V>
811		* Creates a new, empty map with the default initial table size (16).
812		*/
813		public ConcurrentHashMapV8() {
2375	–	this.counter = new LongAdder();
814		}
815
816		/**
#	Line 2391 | Line 829 | public class ConcurrentHashMapV8<K, V>
829		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
830		MAXIMUM_CAPACITY :
831		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2394	–	this.counter = new LongAdder();
832		this.sizeCtl = cap;
833		}
834
#	Line 2401 | Line 838 | public class ConcurrentHashMapV8<K, V>
838		* @param m the map
839		*/
840		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2404	–	this.counter = new LongAdder();
841		this.sizeCtl = DEFAULT_CAPACITY;
842	<	internalPutAll(m);
842	>	putAll(m);
843		}
844
845		/**
#	Line 2444 | Line 880 | public class ConcurrentHashMapV8<K, V>
880		* nonpositive
881		*/
882		public ConcurrentHashMapV8(int initialCapacity,
883	<	float loadFactor, int concurrencyLevel) {
883	>	float loadFactor, int concurrencyLevel) {
884		if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
885		throw new IllegalArgumentException();
886		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
#	Line 2452 | Line 888 | public class ConcurrentHashMapV8<K, V>
888		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
889		int cap = (size >= (long)MAXIMUM_CAPACITY) ?
890		MAXIMUM_CAPACITY : tableSizeFor((int)size);
2455	–	this.counter = new LongAdder();
891		this.sizeCtl = cap;
892		}
893
894	<	/**
2460	<	* {@inheritDoc}
2461	<	*/
2462	<	public boolean isEmpty() {
2463	<	return counter.sum() <= 0L; // ignore transient negative values
2464	<	}
894	>	// Original (since JDK1.2) Map methods
895
896		/**
897		* {@inheritDoc}
898		*/
899		public int size() {
900	<	long n = counter.sum();
900	>	long n = sumCount();
901		return ((n < 0L) ? 0 :
902		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
903		(int)n);
904		}
905
906		/**
907	<	* Returns the number of mappings. This method should be used
2478	<	* instead of {@link #size} because a ConcurrentHashMap may
2479	<	* contain more mappings than can be represented as an int. The
2480	<	* value returned is a snapshot; the actual count may differ if
2481	<	* there are ongoing concurrent insertions or removals.
2482	<	*
2483	<	* @return the number of mappings
907	>	* {@inheritDoc}
908		*/
909	<	public long mappingCount() {
910	<	long n = counter.sum();
2487	<	return (n < 0L) ? 0L : n; // ignore transient negative values
909	>	public boolean isEmpty() {
910	>	return sumCount() <= 0L; // ignore transient negative values
911		}
912
913		/**
#	Line 2498 | Line 921 | public class ConcurrentHashMapV8<K, V>
921		*
922		* @throws NullPointerException if the specified key is null
923		*/
924	<	@SuppressWarnings("unchecked") public V get(Object key) {
925	<	if (key == null)
926	<	throw new NullPointerException();
927	<	return (V)internalGet(key);
928	<	}
929	<
930	<	/**
931	<	* Returns the value to which the specified key is mapped,
932	<	* or the given defaultValue if this map contains no mapping for the key.
933	<	*
934	<	* @param key the key
935	<	* @param defaultValue the value to return if this map contains
936	<	* no mapping for the given key.
937	<	* @return the mapping for the key, if present; else the defaultValue
938	<	* @throws NullPointerException if the specified key is null
939	<	*/
940	<	@SuppressWarnings("unchecked") public V getValueOrDefault(Object key, V defaultValue) {
941	<	if (key == null)
2519	<	throw new NullPointerException();
2520	<	V v = (V) internalGet(key);
2521	<	return v == null ? defaultValue : v;
924	>	public V get(Object key) {
925	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
926	>	int h = spread(key.hashCode());
927	>	if ((tab = table) != null && (n = tab.length) > 0 &&
928	>	(e = tabAt(tab, (n - 1) & h)) != null) {
929	>	if ((eh = e.hash) == h) {
930	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
931	>	return e.val;
932	>	}
933	>	else if (eh < 0)
934	>	return (p = e.find(h, key)) != null ? p.val : null;
935	>	while ((e = e.next) != null) {
936	>	if (e.hash == h &&
937	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
938	>	return e.val;
939	>	}
940	>	}
941	>	return null;
942		}
943
944		/**
945		* Tests if the specified object is a key in this table.
946		*
947	<	* @param  key   possible key
947	>	* @param  key possible key
948		* @return {@code true} if and only if the specified object
949		*         is a key in this table, as determined by the
950		*         {@code equals} method; {@code false} otherwise
951		* @throws NullPointerException if the specified key is null
952		*/
953		public boolean containsKey(Object key) {
954	<	if (key == null)
2535	<	throw new NullPointerException();
2536	<	return internalGet(key) != null;
954	>	return get(key) != null;
955		}
956
957		/**
#	Line 2549 | Line 967 | public class ConcurrentHashMapV8<K, V>
967		public boolean containsValue(Object value) {
968		if (value == null)
969		throw new NullPointerException();
970	<	Object v;
971	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
972	<	while ((v = it.advance()) != null) {
973	<	if (v == value || value.equals(v))
974	<	return true;
970	>	Node<K,V>[] t;
971	>	if ((t = table) != null) {
972	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
973	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
974	>	V v;
975	>	if ((v = p.val) == value || (v != null && value.equals(v)))
976	>	return true;
977	>	}
978		}
979		return false;
980		}
981
982		/**
2562	–	* Legacy method testing if some key maps into the specified value
2563	–	* in this table.  This method is identical in functionality to
2564	–	* {@link #containsValue}, and exists solely to ensure
2565	–	* full compatibility with class {@link java.util.Hashtable},
2566	–	* which supported this method prior to introduction of the
2567	–	* Java Collections framework.
2568	–	*
2569	–	* @param  value a value to search for
2570	–	* @return {@code true} if and only if some key maps to the
2571	–	*         {@code value} argument in this table as
2572	–	*         determined by the {@code equals} method;
2573	–	*         {@code false} otherwise
2574	–	* @throws NullPointerException if the specified value is null
2575	–	*/
2576	–	public boolean contains(Object value) {
2577	–	return containsValue(value);
2578	–	}
2579	–
2580	–	/**
983		* Maps the specified key to the specified value in this table.
984		* Neither the key nor the value can be null.
985		*
986	<	* <p> The value can be retrieved by calling the {@code get} method
986	>	* <p>The value can be retrieved by calling the {@code get} method
987		* with a key that is equal to the original key.
988		*
989		* @param key key with which the specified value is to be associated
#	Line 2590 | Line 992 | public class ConcurrentHashMapV8<K, V>
992		*         {@code null} if there was no mapping for {@code key}
993		* @throws NullPointerException if the specified key or value is null
994		*/
995	<	@SuppressWarnings("unchecked") public V put(K key, V value) {
996	<	if (key == null || value == null)
2595	<	throw new NullPointerException();
2596	<	return (V)internalPut(key, value);
995	>	public V put(K key, V value) {
996	>	return putVal(key, value, false);
997		}
998
999	<	/**
1000	<	* {@inheritDoc}
1001	<	*
1002	<	* @return the previous value associated with the specified key,
1003	<	*         or {@code null} if there was no mapping for the key
1004	<	* @throws NullPointerException if the specified key or value is null
1005	<	*/
1006	<	@SuppressWarnings("unchecked") public V putIfAbsent(K key, V value) {
1007	<	if (key == null || value == null)
1008	<	throw new NullPointerException();
1009	<	return (V)internalPutIfAbsent(key, value);
999	>	/** Implementation for put and putIfAbsent */
1000	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
1001	>	if (key == null || value == null) throw new NullPointerException();
1002	>	int hash = spread(key.hashCode());
1003	>	int binCount = 0;
1004	>	for (Node<K,V>[] tab = table;;) {
1005	>	Node<K,V> f; int n, i, fh;
1006	>	if (tab == null || (n = tab.length) == 0)
1007	>	tab = initTable();
1008	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
1009	>	if (casTabAt(tab, i, null,
1010	>	new Node<K,V>(hash, key, value, null)))
1011	>	break;                   // no lock when adding to empty bin
1012	>	}
1013	>	else if ((fh = f.hash) == MOVED)
1014	>	tab = helpTransfer(tab, f);
1015	>	else {
1016	>	V oldVal = null;
1017	>	synchronized (f) {
1018	>	if (tabAt(tab, i) == f) {
1019	>	if (fh >= 0) {
1020	>	binCount = 1;
1021	>	for (Node<K,V> e = f;; ++binCount) {
1022	>	K ek;
1023	>	if (e.hash == hash &&
1024	>	((ek = e.key) == key ||
1025	>	(ek != null && key.equals(ek)))) {
1026	>	oldVal = e.val;
1027	>	if (!onlyIfAbsent)
1028	>	e.val = value;
1029	>	break;
1030	>	}
1031	>	Node<K,V> pred = e;
1032	>	if ((e = e.next) == null) {
1033	>	pred.next = new Node<K,V>(hash, key,
1034	>	value, null);
1035	>	break;
1036	>	}
1037	>	}
1038	>	}
1039	>	else if (f instanceof TreeBin) {
1040	>	Node<K,V> p;
1041	>	binCount = 2;
1042	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1043	>	value)) != null) {
1044	>	oldVal = p.val;
1045	>	if (!onlyIfAbsent)
1046	>	p.val = value;
1047	>	}
1048	>	}
1049	>	}
1050	>	}
1051	>	if (binCount != 0) {
1052	>	if (binCount >= TREEIFY_THRESHOLD)
1053	>	treeifyBin(tab, i);
1054	>	if (oldVal != null)
1055	>	return oldVal;
1056	>	break;
1057	>	}
1058	>	}
1059	>	}
1060	>	addCount(1L, binCount);
1061	>	return null;
1062		}
1063
1064		/**
#	Line 2617 | Line 1069 | public class ConcurrentHashMapV8<K, V>
1069		* @param m mappings to be stored in this map
1070		*/
1071		public void putAll(Map<? extends K, ? extends V> m) {
1072	<	internalPutAll(m);
1073	<	}
1074	<
2623	<	/**
2624	<	* If the specified key is not already associated with a value,
2625	<	* computes its value using the given mappingFunction and enters
2626	<	* it into the map unless null.  This is equivalent to
2627	<	* <pre> {@code
2628	<	* if (map.containsKey(key))
2629	<	*   return map.get(key);
2630	<	* value = mappingFunction.apply(key);
2631	<	* if (value != null)
2632	<	*   map.put(key, value);
2633	<	* return value;}</pre>
2634	<	*
2635	<	* except that the action is performed atomically.  If the
2636	<	* function returns {@code null} no mapping is recorded. If the
2637	<	* function itself throws an (unchecked) exception, the exception
2638	<	* is rethrown to its caller, and no mapping is recorded.  Some
2639	<	* attempted update operations on this map by other threads may be
2640	<	* blocked while computation is in progress, so the computation
2641	<	* should be short and simple, and must not attempt to update any
2642	<	* other mappings of this Map. The most appropriate usage is to
2643	<	* construct a new object serving as an initial mapped value, or
2644	<	* memoized result, as in:
2645	<	*
2646	<	*  <pre> {@code
2647	<	* map.computeIfAbsent(key, new Fun<K, V>() {
2648	<	*   public V map(K k) { return new Value(f(k)); }});}</pre>
2649	<	*
2650	<	* @param key key with which the specified value is to be associated
2651	<	* @param mappingFunction the function to compute a value
2652	<	* @return the current (existing or computed) value associated with
2653	<	*         the specified key, or null if the computed value is null.
2654	<	* @throws NullPointerException if the specified key or mappingFunction
2655	<	*         is null
2656	<	* @throws IllegalStateException if the computation detectably
2657	<	*         attempts a recursive update to this map that would
2658	<	*         otherwise never complete
2659	<	* @throws RuntimeException or Error if the mappingFunction does so,
2660	<	*         in which case the mapping is left unestablished
2661	<	*/
2662	<	@SuppressWarnings("unchecked") public V computeIfAbsent
2663	<	(K key, Fun<? super K, ? extends V> mappingFunction) {
2664	<	if (key == null || mappingFunction == null)
2665	<	throw new NullPointerException();
2666	<	return (V)internalComputeIfAbsent(key, mappingFunction);
2667	<	}
2668	<
2669	<	/**
2670	<	* If the given key is present, computes a new mapping value given a key and
2671	<	* its current mapped value. This is equivalent to
2672	<	*  <pre> {@code
2673	<	*   if (map.containsKey(key)) {
2674	<	*     value = remappingFunction.apply(key, map.get(key));
2675	<	*     if (value != null)
2676	<	*       map.put(key, value);
2677	<	*     else
2678	<	*       map.remove(key);
2679	<	*   }
2680	<	* }</pre>
2681	<	*
2682	<	* except that the action is performed atomically.  If the
2683	<	* function returns {@code null}, the mapping is removed.  If the
2684	<	* function itself throws an (unchecked) exception, the exception
2685	<	* is rethrown to its caller, and the current mapping is left
2686	<	* unchanged.  Some attempted update operations on this map by
2687	<	* other threads may be blocked while computation is in progress,
2688	<	* so the computation should be short and simple, and must not
2689	<	* attempt to update any other mappings of this Map. For example,
2690	<	* to either create or append new messages to a value mapping:
2691	<	*
2692	<	* @param key key with which the specified value is to be associated
2693	<	* @param remappingFunction the function to compute a value
2694	<	* @return the new value associated with the specified key, or null if none
2695	<	* @throws NullPointerException if the specified key or remappingFunction
2696	<	*         is null
2697	<	* @throws IllegalStateException if the computation detectably
2698	<	*         attempts a recursive update to this map that would
2699	<	*         otherwise never complete
2700	<	* @throws RuntimeException or Error if the remappingFunction does so,
2701	<	*         in which case the mapping is unchanged
2702	<	*/
2703	<	@SuppressWarnings("unchecked") public V computeIfPresent
2704	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2705	<	if (key == null || remappingFunction == null)
2706	<	throw new NullPointerException();
2707	<	return (V)internalCompute(key, true, remappingFunction);
2708	<	}
2709	<
2710	<	/**
2711	<	* Computes a new mapping value given a key and
2712	<	* its current mapped value (or {@code null} if there is no current
2713	<	* mapping). This is equivalent to
2714	<	*  <pre> {@code
2715	<	*   value = remappingFunction.apply(key, map.get(key));
2716	<	*   if (value != null)
2717	<	*     map.put(key, value);
2718	<	*   else
2719	<	*     map.remove(key);
2720	<	* }</pre>
2721	<	*
2722	<	* except that the action is performed atomically.  If the
2723	<	* function returns {@code null}, the mapping is removed.  If the
2724	<	* function itself throws an (unchecked) exception, the exception
2725	<	* is rethrown to its caller, and the current mapping is left
2726	<	* unchanged.  Some attempted update operations on this map by
2727	<	* other threads may be blocked while computation is in progress,
2728	<	* so the computation should be short and simple, and must not
2729	<	* attempt to update any other mappings of this Map. For example,
2730	<	* to either create or append new messages to a value mapping:
2731	<	*
2732	<	* <pre> {@code
2733	<	* Map<Key, String> map = ...;
2734	<	* final String msg = ...;
2735	<	* map.compute(key, new BiFun<Key, String, String>() {
2736	<	*   public String apply(Key k, String v) {
2737	<	*    return (v == null) ? msg : v + msg;});}}</pre>
2738	<	*
2739	<	* @param key key with which the specified value is to be associated
2740	<	* @param remappingFunction the function to compute a value
2741	<	* @return the new value associated with the specified key, or null if none
2742	<	* @throws NullPointerException if the specified key or remappingFunction
2743	<	*         is null
2744	<	* @throws IllegalStateException if the computation detectably
2745	<	*         attempts a recursive update to this map that would
2746	<	*         otherwise never complete
2747	<	* @throws RuntimeException or Error if the remappingFunction does so,
2748	<	*         in which case the mapping is unchanged
2749	<	*/
2750	<	@SuppressWarnings("unchecked") public V compute
2751	<	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2752	<	if (key == null || remappingFunction == null)
2753	<	throw new NullPointerException();
2754	<	return (V)internalCompute(key, false, remappingFunction);
2755	<	}
2756	<
2757	<	/**
2758	<	* If the specified key is not already associated
2759	<	* with a value, associate it with the given value.
2760	<	* Otherwise, replace the value with the results of
2761	<	* the given remapping function. This is equivalent to:
2762	<	*  <pre> {@code
2763	<	*   if (!map.containsKey(key))
2764	<	*     map.put(value);
2765	<	*   else {
2766	<	*     newValue = remappingFunction.apply(map.get(key), value);
2767	<	*     if (value != null)
2768	<	*       map.put(key, value);
2769	<	*     else
2770	<	*       map.remove(key);
2771	<	*   }
2772	<	* }</pre>
2773	<	* except that the action is performed atomically.  If the
2774	<	* function returns {@code null}, the mapping is removed.  If the
2775	<	* function itself throws an (unchecked) exception, the exception
2776	<	* is rethrown to its caller, and the current mapping is left
2777	<	* unchanged.  Some attempted update operations on this map by
2778	<	* other threads may be blocked while computation is in progress,
2779	<	* so the computation should be short and simple, and must not
2780	<	* attempt to update any other mappings of this Map.
2781	<	*/
2782	<	@SuppressWarnings("unchecked") public V merge
2783	<	(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
2784	<	if (key == null || value == null || remappingFunction == null)
2785	<	throw new NullPointerException();
2786	<	return (V)internalMerge(key, value, remappingFunction);
1072	>	tryPresize(m.size());
1073	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1074	>	putVal(e.getKey(), e.getValue(), false);
1075		}
1076
1077		/**
#	Line 2795 | Line 1083 | public class ConcurrentHashMapV8<K, V>
1083		*         {@code null} if there was no mapping for {@code key}
1084		* @throws NullPointerException if the specified key is null
1085		*/
1086	<	@SuppressWarnings("unchecked") public V remove(Object key) {
1087	<	if (key == null)
2800	<	throw new NullPointerException();
2801	<	return (V)internalReplace(key, null, null);
2802	<	}
2803	<
2804	<	/**
2805	<	* {@inheritDoc}
2806	<	*
2807	<	* @throws NullPointerException if the specified key is null
2808	<	*/
2809	<	public boolean remove(Object key, Object value) {
2810	<	if (key == null)
2811	<	throw new NullPointerException();
2812	<	if (value == null)
2813	<	return false;
2814	<	return internalReplace(key, null, value) != null;
2815	<	}
2816	<
2817	<	/**
2818	<	* {@inheritDoc}
2819	<	*
2820	<	* @throws NullPointerException if any of the arguments are null
2821	<	*/
2822	<	public boolean replace(K key, V oldValue, V newValue) {
2823	<	if (key == null || oldValue == null || newValue == null)
2824	<	throw new NullPointerException();
2825	<	return internalReplace(key, newValue, oldValue) != null;
1086	>	public V remove(Object key) {
1087	>	return replaceNode(key, null, null);
1088		}
1089
1090		/**
1091	<	* {@inheritDoc}
1092	<	*
1093	<	* @return the previous value associated with the specified key,
2832	<	*         or {@code null} if there was no mapping for the key
2833	<	* @throws NullPointerException if the specified key or value is null
1091	>	* Implementation for the four public remove/replace methods:
1092	>	* Replaces node value with v, conditional upon match of cv if
1093	>	* non-null.  If resulting value is null, delete.
1094		*/
1095	<	@SuppressWarnings("unchecked") public V replace(K key, V value) {
1096	<	if (key == null || value == null)
1097	<	throw new NullPointerException();
1098	<	return (V)internalReplace(key, value, null);
1095	>	final V replaceNode(Object key, V value, Object cv) {
1096	>	int hash = spread(key.hashCode());
1097	>	for (Node<K,V>[] tab = table;;) {
1098	>	Node<K,V> f; int n, i, fh;
1099	>	if (tab == null || (n = tab.length) == 0 ||
1100	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1101	>	break;
1102	>	else if ((fh = f.hash) == MOVED)
1103	>	tab = helpTransfer(tab, f);
1104	>	else {
1105	>	V oldVal = null;
1106	>	boolean validated = false;
1107	>	synchronized (f) {
1108	>	if (tabAt(tab, i) == f) {
1109	>	if (fh >= 0) {
1110	>	validated = true;
1111	>	for (Node<K,V> e = f, pred = null;;) {
1112	>	K ek;
1113	>	if (e.hash == hash &&
1114	>	((ek = e.key) == key ||
1115	>	(ek != null && key.equals(ek)))) {
1116	>	V ev = e.val;
1117	>	if (cv == null || cv == ev ||
1118	>	(ev != null && cv.equals(ev))) {
1119	>	oldVal = ev;
1120	>	if (value != null)
1121	>	e.val = value;
1122	>	else if (pred != null)
1123	>	pred.next = e.next;
1124	>	else
1125	>	setTabAt(tab, i, e.next);
1126	>	}
1127	>	break;
1128	>	}
1129	>	pred = e;
1130	>	if ((e = e.next) == null)
1131	>	break;
1132	>	}
1133	>	}
1134	>	else if (f instanceof TreeBin) {
1135	>	validated = true;
1136	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1137	>	TreeNode<K,V> r, p;
1138	>	if ((r = t.root) != null &&
1139	>	(p = r.findTreeNode(hash, key, null)) != null) {
1140	>	V pv = p.val;
1141	>	if (cv == null || cv == pv ||
1142	>	(pv != null && cv.equals(pv))) {
1143	>	oldVal = pv;
1144	>	if (value != null)
1145	>	p.val = value;
1146	>	else if (t.removeTreeNode(p))
1147	>	setTabAt(tab, i, untreeify(t.first));
1148	>	}
1149	>	}
1150	>	}
1151	>	}
1152	>	}
1153	>	if (validated) {
1154	>	if (oldVal != null) {
1155	>	if (value == null)
1156	>	addCount(-1L, -1);
1157	>	return oldVal;
1158	>	}
1159	>	break;
1160	>	}
1161	>	}
1162	>	}
1163	>	return null;
1164		}
1165
1166		/**
1167		* Removes all of the mappings from this map.
1168		*/
1169		public void clear() {
1170	<	internalClear();
1170	>	long delta = 0L; // negative number of deletions
1171	>	int i = 0;
1172	>	Node<K,V>[] tab = table;
1173	>	while (tab != null && i < tab.length) {
1174	>	int fh;
1175	>	Node<K,V> f = tabAt(tab, i);
1176	>	if (f == null)
1177	>	++i;
1178	>	else if ((fh = f.hash) == MOVED) {
1179	>	tab = helpTransfer(tab, f);
1180	>	i = 0; // restart
1181	>	}
1182	>	else {
1183	>	synchronized (f) {
1184	>	if (tabAt(tab, i) == f) {
1185	>	Node<K,V> p = (fh >= 0 ? f :
1186	>	(f instanceof TreeBin) ?
1187	>	((TreeBin<K,V>)f).first : null);
1188	>	while (p != null) {
1189	>	--delta;
1190	>	p = p.next;
1191	>	}
1192	>	setTabAt(tab, i++, null);
1193	>	}
1194	>	}
1195	>	}
1196	>	}
1197	>	if (delta != 0L)
1198	>	addCount(delta, -1);
1199		}
1200
1201		/**
1202		* Returns a {@link Set} view of the keys contained in this map.
1203		* The set is backed by the map, so changes to the map are
1204	<	* reflected in the set, and vice-versa.  The set supports element
1204	>	* reflected in the set, and vice-versa. The set supports element
1205		* removal, which removes the corresponding mapping from this map,
1206		* via the {@code Iterator.remove}, {@code Set.remove},
1207		* {@code removeAll}, {@code retainAll}, and {@code clear}
#	Line 2860 | Line 1213 | public class ConcurrentHashMapV8<K, V>
1213		* and guarantees to traverse elements as they existed upon
1214		* construction of the iterator, and may (but is not guaranteed to)
1215		* reflect any modifications subsequent to construction.
1216	+	*
1217	+	* @return the set view
1218		*/
1219	<	public Set<K> keySet() {
1220	<	KeySet<K,V> ks = keySet;
1221	<	return (ks != null) ? ks : (keySet = new KeySet<K,V>(this));
1219	>	public KeySetView<K,V> keySet() {
1220	>	KeySetView<K,V> ks;
1221	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1222		}
1223
1224		/**
#	Line 2881 | Line 1236 | public class ConcurrentHashMapV8<K, V>
1236		* and guarantees to traverse elements as they existed upon
1237		* construction of the iterator, and may (but is not guaranteed to)
1238		* reflect any modifications subsequent to construction.
1239	+	*
1240	+	* @return the collection view
1241		*/
1242		public Collection<V> values() {
1243	<	Values<K,V> vs = values;
1244	<	return (vs != null) ? vs : (values = new Values<K,V>(this));
1243	>	ValuesView<K,V> vs;
1244	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1245		}
1246
1247		/**
#	Line 2894 | Line 1251 | public class ConcurrentHashMapV8<K, V>
1251		* removal, which removes the corresponding mapping from the map,
1252		* via the {@code Iterator.remove}, {@code Set.remove},
1253		* {@code removeAll}, {@code retainAll}, and {@code clear}
1254	<	* operations.  It does not support the {@code add} or
2898	<	* {@code addAll} operations.
1254	>	* operations.
1255		*
1256		* <p>The view's {@code iterator} is a "weakly consistent" iterator
1257		* that will never throw {@link ConcurrentModificationException},
1258		* and guarantees to traverse elements as they existed upon
1259		* construction of the iterator, and may (but is not guaranteed to)
1260		* reflect any modifications subsequent to construction.
2905	–	*/
2906	–	public Set<Map.Entry<K,V>> entrySet() {
2907	–	EntrySet<K,V> es = entrySet;
2908	–	return (es != null) ? es : (entrySet = new EntrySet<K,V>(this));
2909	–	}
2910	–
2911	–	/**
2912	–	* Returns an enumeration of the keys in this table.
2913	–	*
2914	–	* @return an enumeration of the keys in this table
2915	–	* @see #keySet()
2916	–	*/
2917	–	public Enumeration<K> keys() {
2918	–	return new KeyIterator<K,V>(this);
2919	–	}
2920	–
2921	–	/**
2922	–	* Returns an enumeration of the values in this table.
2923	–	*
2924	–	* @return an enumeration of the values in this table
2925	–	* @see #values()
2926	–	*/
2927	–	public Enumeration<V> elements() {
2928	–	return new ValueIterator<K,V>(this);
2929	–	}
2930	–
2931	–	/**
2932	–	* Returns a partitionable iterator of the keys in this map.
2933	–	*
2934	–	* @return a partitionable iterator of the keys in this map
2935	–	*/
2936	–	public Spliterator<K> keySpliterator() {
2937	–	return new KeyIterator<K,V>(this);
2938	–	}
2939	–
2940	–	/**
2941	–	* Returns a partitionable iterator of the values in this map.
2942	–	*
2943	–	* @return a partitionable iterator of the values in this map
2944	–	*/
2945	–	public Spliterator<V> valueSpliterator() {
2946	–	return new ValueIterator<K,V>(this);
2947	–	}
2948	–
2949	–	/**
2950	–	* Returns a partitionable iterator of the entries in this map.
1261		*
1262	<	* @return a partitionable iterator of the entries in this map
1262	>	* @return the set view
1263		*/
1264	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
1265	<	return new EntryIterator<K,V>(this);
1264	>	public Set<Map.Entry<K,V>> entrySet() {
1265	>	EntrySetView<K,V> es;
1266	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1267		}
1268
1269		/**
#	Line 2964 | Line 1275 | public class ConcurrentHashMapV8<K, V>
1275		*/
1276		public int hashCode() {
1277		int h = 0;
1278	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
1279	<	Object v;
1280	<	while ((v = it.advance()) != null) {
1281	<	h += it.nextKey.hashCode() ^ v.hashCode();
1278	>	Node<K,V>[] t;
1279	>	if ((t = table) != null) {
1280	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1281	>	for (Node<K,V> p; (p = it.advance()) != null; )
1282	>	h += p.key.hashCode() ^ p.val.hashCode();
1283		}
1284		return h;
1285		}
#	Line 2984 | Line 1296 | public class ConcurrentHashMapV8<K, V>
1296		* @return a string representation of this map
1297		*/
1298		public String toString() {
1299	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
1299	>	Node<K,V>[] t;
1300	>	int f = (t = table) == null ? 0 : t.length;
1301	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1302		StringBuilder sb = new StringBuilder();
1303		sb.append('{');
1304	<	Object v;
1305	<	if ((v = it.advance()) != null) {
1304	>	Node<K,V> p;
1305	>	if ((p = it.advance()) != null) {
1306		for (;;) {
1307	<	Object k = it.nextKey;
1307	>	K k = p.key;
1308	>	V v = p.val;
1309		sb.append(k == this ? "(this Map)" : k);
1310		sb.append('=');
1311		sb.append(v == this ? "(this Map)" : v);
1312	<	if ((v = it.advance()) == null)
1312	>	if ((p = it.advance()) == null)
1313		break;
1314		sb.append(',').append(' ');
1315		}
#	Line 3017 | Line 1332 | public class ConcurrentHashMapV8<K, V>
1332		if (!(o instanceof Map))
1333		return false;
1334		Map<?,?> m = (Map<?,?>) o;
1335	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
1336	<	Object val;
1337	<	while ((val = it.advance()) != null) {
1338	<	Object v = m.get(it.nextKey);
1335	>	Node<K,V>[] t;
1336	>	int f = (t = table) == null ? 0 : t.length;
1337	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1338	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1339	>	V val = p.val;
1340	>	Object v = m.get(p.key);
1341		if (v == null || (v != val && !v.equals(val)))
1342		return false;
1343		}
#	Line 3028 | Line 1345 | public class ConcurrentHashMapV8<K, V>
1345		Object mk, mv, v;
1346		if ((mk = e.getKey()) == null ||
1347		(mv = e.getValue()) == null ||
1348	<	(v = internalGet(mk)) == null ||
1348	>	(v = get(mk)) == null ||
1349		(mv != v && !mv.equals(v)))
1350		return false;
1351		}
#	Line 3036 | Line 1353 | public class ConcurrentHashMapV8<K, V>
1353		return true;
1354		}
1355
1356	<	/* ----------------Iterators -------------- */
1356	>	/**
1357	>	* Stripped-down version of helper class used in previous version,
1358	>	* declared for the sake of serialization compatibility
1359	>	*/
1360	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1361	>	private static final long serialVersionUID = 2249069246763182397L;
1362	>	final float loadFactor;
1363	>	Segment(float lf) { this.loadFactor = lf; }
1364	>	}
1365
1366	<	@SuppressWarnings("serial") static final class KeyIterator<K,V> extends Traverser<K,V,Object>
1367	<	implements Spliterator<K>, Enumeration<K> {
1368	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
1369	<	KeyIterator(Traverser<K,V,Object> it) {
1370	<	super(it);
1371	<	}
1372	<	public KeyIterator<K,V> split() {
1373	<	if (last != null || (next != null && nextVal == null))
1374	<	throw new IllegalStateException();
1375	<	return new KeyIterator<K,V>(this);
1376	<	}
1377	<	@SuppressWarnings("unchecked") public final K next() {
1378	<	if (nextVal == null && advance() == null)
1379	<	throw new NoSuchElementException();
1380	<	Object k = nextKey;
1381	<	nextVal = null;
1382	<	return (K) k;
1366	>	/**
1367	>	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
1368	>	* stream (i.e., serializes it).
1369	>	* @param s the stream
1370	>	* @throws java.io.IOException if an I/O error occurs
1371	>	* @serialData
1372	>	* the key (Object) and value (Object)
1373	>	* for each key-value mapping, followed by a null pair.
1374	>	* The key-value mappings are emitted in no particular order.
1375	>	*/
1376	>	private void writeObject(java.io.ObjectOutputStream s)
1377	>	throws java.io.IOException {
1378	>	// For serialization compatibility
1379	>	// Emulate segment calculation from previous version of this class
1380	>	int sshift = 0;
1381	>	int ssize = 1;
1382	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1383	>	++sshift;
1384	>	ssize <<= 1;
1385	>	}
1386	>	int segmentShift = 32 - sshift;
1387	>	int segmentMask = ssize - 1;
1388	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1389	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1390	>	for (int i = 0; i < segments.length; ++i)
1391	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1392	>	s.putFields().put("segments", segments);
1393	>	s.putFields().put("segmentShift", segmentShift);
1394	>	s.putFields().put("segmentMask", segmentMask);
1395	>	s.writeFields();
1396	>
1397	>	Node<K,V>[] t;
1398	>	if ((t = table) != null) {
1399	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1400	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1401	>	s.writeObject(p.key);
1402	>	s.writeObject(p.val);
1403	>	}
1404		}
1405	<
1406	<	public final K nextElement() { return next(); }
1405	>	s.writeObject(null);
1406	>	s.writeObject(null);
1407	>	segments = null; // throw away
1408		}
1409
1410	<	@SuppressWarnings("serial") static final class ValueIterator<K,V> extends Traverser<K,V,Object>
1411	<	implements Spliterator<V>, Enumeration<V> {
1412	<	ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
1413	<	ValueIterator(Traverser<K,V,Object> it) {
1414	<	super(it);
1415	<	}
1416	<	public ValueIterator<K,V> split() {
1417	<	if (last != null || (next != null && nextVal == null))
1418	<	throw new IllegalStateException();
1419	<	return new ValueIterator<K,V>(this);
1410	>	/**
1411	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1412	>	* @param s the stream
1413	>	* @throws ClassNotFoundException if the class of a serialized object
1414	>	*         could not be found
1415	>	* @throws java.io.IOException if an I/O error occurs
1416	>	*/
1417	>	private void readObject(java.io.ObjectInputStream s)
1418	>	throws java.io.IOException, ClassNotFoundException {
1419	>	/*
1420	>	* To improve performance in typical cases, we create nodes
1421	>	* while reading, then place in table once size is known.
1422	>	* However, we must also validate uniqueness and deal with
1423	>	* overpopulated bins while doing so, which requires
1424	>	* specialized versions of putVal mechanics.
1425	>	*/
1426	>	sizeCtl = -1; // force exclusion for table construction
1427	>	s.defaultReadObject();
1428	>	long size = 0L;
1429	>	Node<K,V> p = null;
1430	>	for (;;) {
1431	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1432	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1433	>	if (k != null && v != null) {
1434	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1435	>	++size;
1436	>	}
1437	>	else
1438	>	break;
1439		}
1440	<
1441	<	@SuppressWarnings("unchecked") public final V next() {
1442	<	Object v;
1443	<	if ((v = nextVal) == null && (v = advance()) == null)
1444	<	throw new NoSuchElementException();
1445	<	nextVal = null;
1446	<	return (V) v;
1440	>	if (size == 0L)
1441	>	sizeCtl = 0;
1442	>	else {
1443	>	int n;
1444	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1445	>	n = MAXIMUM_CAPACITY;
1446	>	else {
1447	>	int sz = (int)size;
1448	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1449	>	}
1450	>	@SuppressWarnings("unchecked")
1451	>	Node<K,V>[] tab = (Node<K,V>[])new Node<?,?>[n];
1452	>	int mask = n - 1;
1453	>	long added = 0L;
1454	>	while (p != null) {
1455	>	boolean insertAtFront;
1456	>	Node<K,V> next = p.next, first;
1457	>	int h = p.hash, j = h & mask;
1458	>	if ((first = tabAt(tab, j)) == null)
1459	>	insertAtFront = true;
1460	>	else {
1461	>	K k = p.key;
1462	>	if (first.hash < 0) {
1463	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1464	>	if (t.putTreeVal(h, k, p.val) == null)
1465	>	++added;
1466	>	insertAtFront = false;
1467	>	}
1468	>	else {
1469	>	int binCount = 0;
1470	>	insertAtFront = true;
1471	>	Node<K,V> q; K qk;
1472	>	for (q = first; q != null; q = q.next) {
1473	>	if (q.hash == h &&
1474	>	((qk = q.key) == k ||
1475	>	(qk != null && k.equals(qk)))) {
1476	>	insertAtFront = false;
1477	>	break;
1478	>	}
1479	>	++binCount;
1480	>	}
1481	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1482	>	insertAtFront = false;
1483	>	++added;
1484	>	p.next = first;
1485	>	TreeNode<K,V> hd = null, tl = null;
1486	>	for (q = p; q != null; q = q.next) {
1487	>	TreeNode<K,V> t = new TreeNode<K,V>
1488	>	(q.hash, q.key, q.val, null, null);
1489	>	if ((t.prev = tl) == null)
1490	>	hd = t;
1491	>	else
1492	>	tl.next = t;
1493	>	tl = t;
1494	>	}
1495	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1496	>	}
1497	>	}
1498	>	}
1499	>	if (insertAtFront) {
1500	>	++added;
1501	>	p.next = first;
1502	>	setTabAt(tab, j, p);
1503	>	}
1504	>	p = next;
1505	>	}
1506	>	table = tab;
1507	>	sizeCtl = n - (n >>> 2);
1508	>	baseCount = added;
1509		}
3082	–
3083	–	public final V nextElement() { return next(); }
1510		}
1511
1512	<	@SuppressWarnings("serial") static final class EntryIterator<K,V> extends Traverser<K,V,Object>
3087	<	implements Spliterator<Map.Entry<K,V>> {
3088	<	EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3089	<	EntryIterator(Traverser<K,V,Object> it) {
3090	<	super(it);
3091	<	}
3092	<	public EntryIterator<K,V> split() {
3093	<	if (last != null || (next != null && nextVal == null))
3094	<	throw new IllegalStateException();
3095	<	return new EntryIterator<K,V>(this);
3096	<	}
1512	>	// ConcurrentMap methods
1513
1514	<	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
1515	<	Object v;
1516	<	if ((v = nextVal) == null && (v = advance()) == null)
1517	<	throw new NoSuchElementException();
1518	<	Object k = nextKey;
1519	<	nextVal = null;
1520	<	return new MapEntry<K,V>((K)k, (V)v, map);
1521	<	}
1514	>	/**
1515	>	* {@inheritDoc}
1516	>	*
1517	>	* @return the previous value associated with the specified key,
1518	>	*         or {@code null} if there was no mapping for the key
1519	>	* @throws NullPointerException if the specified key or value is null
1520	>	*/
1521	>	public V putIfAbsent(K key, V value) {
1522	>	return putVal(key, value, true);
1523		}
1524
1525		/**
1526	<	* Exported Entry for iterators
1526	>	* {@inheritDoc}
1527	>	*
1528	>	* @throws NullPointerException if the specified key is null
1529		*/
1530	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
1531	<	final K key; // non-null
1532	<	V val;       // non-null
1533	<	final ConcurrentHashMapV8<K, V> map;
3115	<	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3116	<	this.key = key;
3117	<	this.val = val;
3118	<	this.map = map;
3119	<	}
3120	<	public final K getKey()       { return key; }
3121	<	public final V getValue()     { return val; }
3122	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3123	<	public final String toString(){ return key + "=" + val; }
3124	<
3125	<	public final boolean equals(Object o) {
3126	<	Object k, v; Map.Entry<?,?> e;
3127	<	return ((o instanceof Map.Entry) &&
3128	<	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
3129	<	(v = e.getValue()) != null &&
3130	<	(k == key || k.equals(key)) &&
3131	<	(v == val || v.equals(val)));
3132	<	}
3133	<
3134	<	/**
3135	<	* Sets our entry's value and writes through to the map. The
3136	<	* value to return is somewhat arbitrary here. Since we do not
3137	<	* necessarily track asynchronous changes, the most recent
3138	<	* "previous" value could be different from what we return (or
3139	<	* could even have been removed in which case the put will
3140	<	* re-establish). We do not and cannot guarantee more.
3141	<	*/
3142	<	public final V setValue(V value) {
3143	<	if (value == null) throw new NullPointerException();
3144	<	V v = val;
3145	<	val = value;
3146	<	map.put(key, value);
3147	<	return v;
3148	<	}
1530	>	public boolean remove(Object key, Object value) {
1531	>	if (key == null)
1532	>	throw new NullPointerException();
1533	>	return value != null && replaceNode(key, null, value) != null;
1534		}
1535
1536	<	/* ----------------Views -------------- */
1536	>	/**
1537	>	* {@inheritDoc}
1538	>	*
1539	>	* @throws NullPointerException if any of the arguments are null
1540	>	*/
1541	>	public boolean replace(K key, V oldValue, V newValue) {
1542	>	if (key == null || oldValue == null || newValue == null)
1543	>	throw new NullPointerException();
1544	>	return replaceNode(key, newValue, oldValue) != null;
1545	>	}
1546
1547		/**
1548	<	* Base class for views.
1548	>	* {@inheritDoc}
1549	>	*
1550	>	* @return the previous value associated with the specified key,
1551	>	*         or {@code null} if there was no mapping for the key
1552	>	* @throws NullPointerException if the specified key or value is null
1553		*/
1554	<	static abstract class CHMView<K, V> {
1555	<	final ConcurrentHashMapV8<K, V> map;
1556	<	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
1557	<	public final int size()                 { return map.size(); }
1558	<	public final boolean isEmpty()          { return map.isEmpty(); }
3161	<	public final void clear()               { map.clear(); }
1554	>	public V replace(K key, V value) {
1555	>	if (key == null || value == null)
1556	>	throw new NullPointerException();
1557	>	return replaceNode(key, value, null);
1558	>	}
1559
1560	<	// implementations below rely on concrete classes supplying these
3164	<	abstract public Iterator<?> iterator();
3165	<	abstract public boolean contains(Object o);
3166	<	abstract public boolean remove(Object o);
1560	>	// Overrides of JDK8+ Map extension method defaults
1561
1562	<	private static final String oomeMsg = "Required array size too large";
1562	>	/**
1563	>	* Returns the value to which the specified key is mapped, or the
1564	>	* given default value if this map contains no mapping for the
1565	>	* key.
1566	>	*
1567	>	* @param key the key whose associated value is to be returned
1568	>	* @param defaultValue the value to return if this map contains
1569	>	* no mapping for the given key
1570	>	* @return the mapping for the key, if present; else the default value
1571	>	* @throws NullPointerException if the specified key is null
1572	>	*/
1573	>	public V getOrDefault(Object key, V defaultValue) {
1574	>	V v;
1575	>	return (v = get(key)) == null ? defaultValue : v;
1576	>	}
1577	>
1578	>	public void forEach(BiAction<? super K, ? super V> action) {
1579	>	if (action == null) throw new NullPointerException();
1580	>	Node<K,V>[] t;
1581	>	if ((t = table) != null) {
1582	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1583	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1584	>	action.apply(p.key, p.val);
1585	>	}
1586	>	}
1587	>	}
1588
1589	<	public final Object[] toArray() {
1590	<	long sz = map.mappingCount();
1591	<	if (sz > (long)(MAX_ARRAY_SIZE))
1592	<	throw new OutOfMemoryError(oomeMsg);
1593	<	int n = (int)sz;
1594	<	Object[] r = new Object[n];
1595	<	int i = 0;
1596	<	Iterator<?> it = iterator();
1597	<	while (it.hasNext()) {
1598	<	if (i == n) {
1599	<	if (n >= MAX_ARRAY_SIZE)
1600	<	throw new OutOfMemoryError(oomeMsg);
1601	<	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
1602	<	n = MAX_ARRAY_SIZE;
3184	<	else
3185	<	n += (n >>> 1) + 1;
3186	<	r = Arrays.copyOf(r, n);
1589	>	public void replaceAll(BiFun<? super K, ? super V, ? extends V> function) {
1590	>	if (function == null) throw new NullPointerException();
1591	>	Node<K,V>[] t;
1592	>	if ((t = table) != null) {
1593	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1594	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1595	>	V oldValue = p.val;
1596	>	for (K key = p.key;;) {
1597	>	V newValue = function.apply(key, oldValue);
1598	>	if (newValue == null)
1599	>	throw new NullPointerException();
1600	>	if (replaceNode(key, newValue, oldValue) != null ||
1601	>	(oldValue = get(key)) == null)
1602	>	break;
1603		}
3188	–	r[i++] = it.next();
1604		}
3190	–	return (i == n) ? r : Arrays.copyOf(r, i);
1605		}
1606	+	}
1607
1608	<	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
1609	<	long sz = map.mappingCount();
1610	<	if (sz > (long)(MAX_ARRAY_SIZE))
1611	<	throw new OutOfMemoryError(oomeMsg);
1612	<	int m = (int)sz;
1613	<	T[] r = (a.length >= m) ? a :
1614	<	(T[])java.lang.reflect.Array
1615	<	.newInstance(a.getClass().getComponentType(), m);
1616	<	int n = r.length;
1617	<	int i = 0;
1618	<	Iterator<?> it = iterator();
1619	<	while (it.hasNext()) {
1620	<	if (i == n) {
1621	<	if (n >= MAX_ARRAY_SIZE)
1622	<	throw new OutOfMemoryError(oomeMsg);
1623	<	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
1624	<	n = MAX_ARRAY_SIZE;
1625	<	else
1626	<	n += (n >>> 1) + 1;
1627	<	r = Arrays.copyOf(r, n);
1608	>	/**
1609	>	* If the specified key is not already associated with a value,
1610	>	* attempts to compute its value using the given mapping function
1611	>	* and enters it into this map unless {@code null}.  The entire
1612	>	* method invocation is performed atomically, so the function is
1613	>	* applied at most once per key.  Some attempted update operations
1614	>	* on this map by other threads may be blocked while computation
1615	>	* is in progress, so the computation should be short and simple,
1616	>	* and must not attempt to update any other mappings of this map.
1617	>	*
1618	>	* @param key key with which the specified value is to be associated
1619	>	* @param mappingFunction the function to compute a value
1620	>	* @return the current (existing or computed) value associated with
1621	>	*         the specified key, or null if the computed value is null
1622	>	* @throws NullPointerException if the specified key or mappingFunction
1623	>	*         is null
1624	>	* @throws IllegalStateException if the computation detectably
1625	>	*         attempts a recursive update to this map that would
1626	>	*         otherwise never complete
1627	>	* @throws RuntimeException or Error if the mappingFunction does so,
1628	>	*         in which case the mapping is left unestablished
1629	>	*/
1630	>	public V computeIfAbsent(K key, Fun<? super K, ? extends V> mappingFunction) {
1631	>	if (key == null || mappingFunction == null)
1632	>	throw new NullPointerException();
1633	>	int h = spread(key.hashCode());
1634	>	V val = null;
1635	>	int binCount = 0;
1636	>	for (Node<K,V>[] tab = table;;) {
1637	>	Node<K,V> f; int n, i, fh;
1638	>	if (tab == null || (n = tab.length) == 0)
1639	>	tab = initTable();
1640	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1641	>	Node<K,V> r = new ReservationNode<K,V>();
1642	>	synchronized (r) {
1643	>	if (casTabAt(tab, i, null, r)) {
1644	>	binCount = 1;
1645	>	Node<K,V> node = null;
1646	>	try {
1647	>	if ((val = mappingFunction.apply(key)) != null)
1648	>	node = new Node<K,V>(h, key, val, null);
1649	>	} finally {
1650	>	setTabAt(tab, i, node);
1651	>	}
1652	>	}
1653		}
1654	<	r[i++] = (T)it.next();
1654	>	if (binCount != 0)
1655	>	break;
1656		}
1657	<	if (a == r && i < n) {
1658	<	r[i] = null; // null-terminate
1659	<	return r;
1657	>	else if ((fh = f.hash) == MOVED)
1658	>	tab = helpTransfer(tab, f);
1659	>	else {
1660	>	boolean added = false;
1661	>	synchronized (f) {
1662	>	if (tabAt(tab, i) == f) {
1663	>	if (fh >= 0) {
1664	>	binCount = 1;
1665	>	for (Node<K,V> e = f;; ++binCount) {
1666	>	K ek; V ev;
1667	>	if (e.hash == h &&
1668	>	((ek = e.key) == key ||
1669	>	(ek != null && key.equals(ek)))) {
1670	>	val = e.val;
1671	>	break;
1672	>	}
1673	>	Node<K,V> pred = e;
1674	>	if ((e = e.next) == null) {
1675	>	if ((val = mappingFunction.apply(key)) != null) {
1676	>	added = true;
1677	>	pred.next = new Node<K,V>(h, key, val, null);
1678	>	}
1679	>	break;
1680	>	}
1681	>	}
1682	>	}
1683	>	else if (f instanceof TreeBin) {
1684	>	binCount = 2;
1685	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1686	>	TreeNode<K,V> r, p;
1687	>	if ((r = t.root) != null &&
1688	>	(p = r.findTreeNode(h, key, null)) != null)
1689	>	val = p.val;
1690	>	else if ((val = mappingFunction.apply(key)) != null) {
1691	>	added = true;
1692	>	t.putTreeVal(h, key, val);
1693	>	}
1694	>	}
1695	>	}
1696	>	}
1697	>	if (binCount != 0) {
1698	>	if (binCount >= TREEIFY_THRESHOLD)
1699	>	treeifyBin(tab, i);
1700	>	if (!added)
1701	>	return val;
1702	>	break;
1703	>	}
1704		}
3220	–	return (i == n) ? r : Arrays.copyOf(r, i);
3221	–	}
3222	–
3223	–	public final int hashCode() {
3224	–	int h = 0;
3225	–	for (Iterator<?> it = iterator(); it.hasNext();)
3226	–	h += it.next().hashCode();
3227	–	return h;
1705		}
1706	+	if (val != null)
1707	+	addCount(1L, binCount);
1708	+	return val;
1709	+	}
1710
1711	<	public final String toString() {
1712	<	StringBuilder sb = new StringBuilder();
1713	<	sb.append('[');
1714	<	Iterator<?> it = iterator();
1715	<	if (it.hasNext()) {
1716	<	for (;;) {
1717	<	Object e = it.next();
1718	<	sb.append(e == this ? "(this Collection)" : e);
1719	<	if (!it.hasNext())
1720	<	break;
1721	<	sb.append(',').append(' ');
1711	>	/**
1712	>	* If the value for the specified key is present, attempts to
1713	>	* compute a new mapping given the key and its current mapped
1714	>	* value.  The entire method invocation is performed atomically.
1715	>	* Some attempted update operations on this map by other threads
1716	>	* may be blocked while computation is in progress, so the
1717	>	* computation should be short and simple, and must not attempt to
1718	>	* update any other mappings of this map.
1719	>	*
1720	>	* @param key key with which a value may be associated
1721	>	* @param remappingFunction the function to compute a value
1722	>	* @return the new value associated with the specified key, or null if none
1723	>	* @throws NullPointerException if the specified key or remappingFunction
1724	>	*         is null
1725	>	* @throws IllegalStateException if the computation detectably
1726	>	*         attempts a recursive update to this map that would
1727	>	*         otherwise never complete
1728	>	* @throws RuntimeException or Error if the remappingFunction does so,
1729	>	*         in which case the mapping is unchanged
1730	>	*/
1731	>	public V computeIfPresent(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1732	>	if (key == null || remappingFunction == null)
1733	>	throw new NullPointerException();
1734	>	int h = spread(key.hashCode());
1735	>	V val = null;
1736	>	int delta = 0;
1737	>	int binCount = 0;
1738	>	for (Node<K,V>[] tab = table;;) {
1739	>	Node<K,V> f; int n, i, fh;
1740	>	if (tab == null || (n = tab.length) == 0)
1741	>	tab = initTable();
1742	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1743	>	break;
1744	>	else if ((fh = f.hash) == MOVED)
1745	>	tab = helpTransfer(tab, f);
1746	>	else {
1747	>	synchronized (f) {
1748	>	if (tabAt(tab, i) == f) {
1749	>	if (fh >= 0) {
1750	>	binCount = 1;
1751	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1752	>	K ek;
1753	>	if (e.hash == h &&
1754	>	((ek = e.key) == key ||
1755	>	(ek != null && key.equals(ek)))) {
1756	>	val = remappingFunction.apply(key, e.val);
1757	>	if (val != null)
1758	>	e.val = val;
1759	>	else {
1760	>	delta = -1;
1761	>	Node<K,V> en = e.next;
1762	>	if (pred != null)
1763	>	pred.next = en;
1764	>	else
1765	>	setTabAt(tab, i, en);
1766	>	}
1767	>	break;
1768	>	}
1769	>	pred = e;
1770	>	if ((e = e.next) == null)
1771	>	break;
1772	>	}
1773	>	}
1774	>	else if (f instanceof TreeBin) {
1775	>	binCount = 2;
1776	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1777	>	TreeNode<K,V> r, p;
1778	>	if ((r = t.root) != null &&
1779	>	(p = r.findTreeNode(h, key, null)) != null) {
1780	>	val = remappingFunction.apply(key, p.val);
1781	>	if (val != null)
1782	>	p.val = val;
1783	>	else {
1784	>	delta = -1;
1785	>	if (t.removeTreeNode(p))
1786	>	setTabAt(tab, i, untreeify(t.first));
1787	>	}
1788	>	}
1789	>	}
1790	>	}
1791		}
1792	+	if (binCount != 0)
1793	+	break;
1794		}
3243	–	return sb.append(']').toString();
1795		}
1796	+	if (delta != 0)
1797	+	addCount((long)delta, binCount);
1798	+	return val;
1799	+	}
1800
1801	<	public final boolean containsAll(Collection<?> c) {
1802	<	if (c != this) {
1803	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
1804	<	Object e = it.next();
1805	<	if (e == null || !contains(e))
1806	<	return false;
1801	>	/**
1802	>	* Attempts to compute a mapping for the specified key and its
1803	>	* current mapped value (or {@code null} if there is no current
1804	>	* mapping). The entire method invocation is performed atomically.
1805	>	* Some attempted update operations on this map by other threads
1806	>	* may be blocked while computation is in progress, so the
1807	>	* computation should be short and simple, and must not attempt to
1808	>	* update any other mappings of this Map.
1809	>	*
1810	>	* @param key key with which the specified value is to be associated
1811	>	* @param remappingFunction the function to compute a value
1812	>	* @return the new value associated with the specified key, or null if none
1813	>	* @throws NullPointerException if the specified key or remappingFunction
1814	>	*         is null
1815	>	* @throws IllegalStateException if the computation detectably
1816	>	*         attempts a recursive update to this map that would
1817	>	*         otherwise never complete
1818	>	* @throws RuntimeException or Error if the remappingFunction does so,
1819	>	*         in which case the mapping is unchanged
1820	>	*/
1821	>	public V compute(K key,
1822	>	BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1823	>	if (key == null || remappingFunction == null)
1824	>	throw new NullPointerException();
1825	>	int h = spread(key.hashCode());
1826	>	V val = null;
1827	>	int delta = 0;
1828	>	int binCount = 0;
1829	>	for (Node<K,V>[] tab = table;;) {
1830	>	Node<K,V> f; int n, i, fh;
1831	>	if (tab == null || (n = tab.length) == 0)
1832	>	tab = initTable();
1833	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1834	>	Node<K,V> r = new ReservationNode<K,V>();
1835	>	synchronized (r) {
1836	>	if (casTabAt(tab, i, null, r)) {
1837	>	binCount = 1;
1838	>	Node<K,V> node = null;
1839	>	try {
1840	>	if ((val = remappingFunction.apply(key, null)) != null) {
1841	>	delta = 1;
1842	>	node = new Node<K,V>(h, key, val, null);
1843	>	}
1844	>	} finally {
1845	>	setTabAt(tab, i, node);
1846	>	}
1847	>	}
1848		}
1849	+	if (binCount != 0)
1850	+	break;
1851		}
1852	<	return true;
1853	<	}
1854	<
1855	<	public final boolean removeAll(Collection<?> c) {
1856	<	boolean modified = false;
1857	<	for (Iterator<?> it = iterator(); it.hasNext();) {
1858	<	if (c.contains(it.next())) {
1859	<	it.remove();
1860	<	modified = true;
1852	>	else if ((fh = f.hash) == MOVED)
1853	>	tab = helpTransfer(tab, f);
1854	>	else {
1855	>	synchronized (f) {
1856	>	if (tabAt(tab, i) == f) {
1857	>	if (fh >= 0) {
1858	>	binCount = 1;
1859	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1860	>	K ek;
1861	>	if (e.hash == h &&
1862	>	((ek = e.key) == key ||
1863	>	(ek != null && key.equals(ek)))) {
1864	>	val = remappingFunction.apply(key, e.val);
1865	>	if (val != null)
1866	>	e.val = val;
1867	>	else {
1868	>	delta = -1;
1869	>	Node<K,V> en = e.next;
1870	>	if (pred != null)
1871	>	pred.next = en;
1872	>	else
1873	>	setTabAt(tab, i, en);
1874	>	}
1875	>	break;
1876	>	}
1877	>	pred = e;
1878	>	if ((e = e.next) == null) {
1879	>	val = remappingFunction.apply(key, null);
1880	>	if (val != null) {
1881	>	delta = 1;
1882	>	pred.next =
1883	>	new Node<K,V>(h, key, val, null);
1884	>	}
1885	>	break;
1886	>	}
1887	>	}
1888	>	}
1889	>	else if (f instanceof TreeBin) {
1890	>	binCount = 1;
1891	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1892	>	TreeNode<K,V> r, p;
1893	>	if ((r = t.root) != null)
1894	>	p = r.findTreeNode(h, key, null);
1895	>	else
1896	>	p = null;
1897	>	V pv = (p == null) ? null : p.val;
1898	>	val = remappingFunction.apply(key, pv);
1899	>	if (val != null) {
1900	>	if (p != null)
1901	>	p.val = val;
1902	>	else {
1903	>	delta = 1;
1904	>	t.putTreeVal(h, key, val);
1905	>	}
1906	>	}
1907	>	else if (p != null) {
1908	>	delta = -1;
1909	>	if (t.removeTreeNode(p))
1910	>	setTabAt(tab, i, untreeify(t.first));
1911	>	}
1912	>	}
1913	>	}
1914	>	}
1915	>	if (binCount != 0) {
1916	>	if (binCount >= TREEIFY_THRESHOLD)
1917	>	treeifyBin(tab, i);
1918	>	break;
1919		}
1920		}
3265	–	return modified;
1921		}
1922	+	if (delta != 0)
1923	+	addCount((long)delta, binCount);
1924	+	return val;
1925	+	}
1926
1927	<	public final boolean retainAll(Collection<?> c) {
1928	<	boolean modified = false;
1929	<	for (Iterator<?> it = iterator(); it.hasNext();) {
1930	<	if (!c.contains(it.next())) {
1931	<	it.remove();
1932	<	modified = true;
1927	>	/**
1928	>	* If the specified key is not already associated with a
1929	>	* (non-null) value, associates it with the given value.
1930	>	* Otherwise, replaces the value with the results of the given
1931	>	* remapping function, or removes if {@code null}. The entire
1932	>	* method invocation is performed atomically.  Some attempted
1933	>	* update operations on this map by other threads may be blocked
1934	>	* while computation is in progress, so the computation should be
1935	>	* short and simple, and must not attempt to update any other
1936	>	* mappings of this Map.
1937	>	*
1938	>	* @param key key with which the specified value is to be associated
1939	>	* @param value the value to use if absent
1940	>	* @param remappingFunction the function to recompute a value if present
1941	>	* @return the new value associated with the specified key, or null if none
1942	>	* @throws NullPointerException if the specified key or the
1943	>	*         remappingFunction is null
1944	>	* @throws RuntimeException or Error if the remappingFunction does so,
1945	>	*         in which case the mapping is unchanged
1946	>	*/
1947	>	public V merge(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1948	>	if (key == null || value == null || remappingFunction == null)
1949	>	throw new NullPointerException();
1950	>	int h = spread(key.hashCode());
1951	>	V val = null;
1952	>	int delta = 0;
1953	>	int binCount = 0;
1954	>	for (Node<K,V>[] tab = table;;) {
1955	>	Node<K,V> f; int n, i, fh;
1956	>	if (tab == null || (n = tab.length) == 0)
1957	>	tab = initTable();
1958	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1959	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1960	>	delta = 1;
1961	>	val = value;
1962	>	break;
1963	>	}
1964	>	}
1965	>	else if ((fh = f.hash) == MOVED)
1966	>	tab = helpTransfer(tab, f);
1967	>	else {
1968	>	synchronized (f) {
1969	>	if (tabAt(tab, i) == f) {
1970	>	if (fh >= 0) {
1971	>	binCount = 1;
1972	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1973	>	K ek;
1974	>	if (e.hash == h &&
1975	>	((ek = e.key) == key ||
1976	>	(ek != null && key.equals(ek)))) {
1977	>	val = remappingFunction.apply(e.val, value);
1978	>	if (val != null)
1979	>	e.val = val;
1980	>	else {
1981	>	delta = -1;
1982	>	Node<K,V> en = e.next;
1983	>	if (pred != null)
1984	>	pred.next = en;
1985	>	else
1986	>	setTabAt(tab, i, en);
1987	>	}
1988	>	break;
1989	>	}
1990	>	pred = e;
1991	>	if ((e = e.next) == null) {
1992	>	delta = 1;
1993	>	val = value;
1994	>	pred.next =
1995	>	new Node<K,V>(h, key, val, null);
1996	>	break;
1997	>	}
1998	>	}
1999	>	}
2000	>	else if (f instanceof TreeBin) {
2001	>	binCount = 2;
2002	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2003	>	TreeNode<K,V> r = t.root;
2004	>	TreeNode<K,V> p = (r == null) ? null :
2005	>	r.findTreeNode(h, key, null);
2006	>	val = (p == null) ? value :
2007	>	remappingFunction.apply(p.val, value);
2008	>	if (val != null) {
2009	>	if (p != null)
2010	>	p.val = val;
2011	>	else {
2012	>	delta = 1;
2013	>	t.putTreeVal(h, key, val);
2014	>	}
2015	>	}
2016	>	else if (p != null) {
2017	>	delta = -1;
2018	>	if (t.removeTreeNode(p))
2019	>	setTabAt(tab, i, untreeify(t.first));
2020	>	}
2021	>	}
2022	>	}
2023	>	}
2024	>	if (binCount != 0) {
2025	>	if (binCount >= TREEIFY_THRESHOLD)
2026	>	treeifyBin(tab, i);
2027	>	break;
2028		}
2029		}
3276	–	return modified;
2030		}
2031	+	if (delta != 0)
2032	+	addCount((long)delta, binCount);
2033	+	return val;
2034	+	}
2035	+
2036	+	// Hashtable legacy methods
2037
2038	+	/**
2039	+	* Legacy method testing if some key maps into the specified value
2040	+	* in this table.  This method is identical in functionality to
2041	+	* {@link #containsValue(Object)}, and exists solely to ensure
2042	+	* full compatibility with class {@link java.util.Hashtable},
2043	+	* which supported this method prior to introduction of the
2044	+	* Java Collections framework.
2045	+	*
2046	+	* @param  value a value to search for
2047	+	* @return {@code true} if and only if some key maps to the
2048	+	*         {@code value} argument in this table as
2049	+	*         determined by the {@code equals} method;
2050	+	*         {@code false} otherwise
2051	+	* @throws NullPointerException if the specified value is null
2052	+	*/
2053	+	@Deprecated public boolean contains(Object value) {
2054	+	return containsValue(value);
2055		}
2056
2057	<	static final class KeySet<K,V> extends CHMView<K,V> implements Set<K> {
2058	<	KeySet(ConcurrentHashMapV8<K, V> map)  {
2059	<	super(map);
2060	<	}
2061	<	public final boolean contains(Object o) { return map.containsKey(o); }
2062	<	public final boolean remove(Object o)   { return map.remove(o) != null; }
2063	<	public final Iterator<K> iterator() {
2064	<	return new KeyIterator<K,V>(map);
2065	<	}
2066	<	public final boolean add(K e) {
3291	<	throw new UnsupportedOperationException();
3292	<	}
3293	<	public final boolean addAll(Collection<? extends K> c) {
3294	<	throw new UnsupportedOperationException();
3295	<	}
3296	<	public boolean equals(Object o) {
3297	<	Set<?> c;
3298	<	return ((o instanceof Set) &&
3299	<	((c = (Set<?>)o) == this ||
3300	<	(containsAll(c) && c.containsAll(this))));
3301	<	}
2057	>	/**
2058	>	* Returns an enumeration of the keys in this table.
2059	>	*
2060	>	* @return an enumeration of the keys in this table
2061	>	* @see #keySet()
2062	>	*/
2063	>	public Enumeration<K> keys() {
2064	>	Node<K,V>[] t;
2065	>	int f = (t = table) == null ? 0 : t.length;
2066	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2067		}
2068
2069	+	/**
2070	+	* Returns an enumeration of the values in this table.
2071	+	*
2072	+	* @return an enumeration of the values in this table
2073	+	* @see #values()
2074	+	*/
2075	+	public Enumeration<V> elements() {
2076	+	Node<K,V>[] t;
2077	+	int f = (t = table) == null ? 0 : t.length;
2078	+	return new ValueIterator<K,V>(t, f, 0, f, this);
2079	+	}
2080
2081	<	static final class Values<K,V> extends CHMView<K,V>
2082	<	implements Collection<V> {
2083	<	Values(ConcurrentHashMapV8<K, V> map)   { super(map); }
2084	<	public final boolean contains(Object o) { return map.containsValue(o); }
2085	<	public final boolean remove(Object o) {
2086	<	if (o != null) {
2087	<	Iterator<V> it = new ValueIterator<K,V>(map);
2088	<	while (it.hasNext()) {
2089	<	if (o.equals(it.next())) {
2090	<	it.remove();
2091	<	return true;
2081	>	// ConcurrentHashMapV8-only methods
2082	>
2083	>	/**
2084	>	* Returns the number of mappings. This method should be used
2085	>	* instead of {@link #size} because a ConcurrentHashMapV8 may
2086	>	* contain more mappings than can be represented as an int. The
2087	>	* value returned is an estimate; the actual count may differ if
2088	>	* there are concurrent insertions or removals.
2089	>	*
2090	>	* @return the number of mappings
2091	>	* @since 1.8
2092	>	*/
2093	>	public long mappingCount() {
2094	>	long n = sumCount();
2095	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2096	>	}
2097	>
2098	>	/**
2099	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2100	>	* from the given type to {@code Boolean.TRUE}.
2101	>	*
2102	>	* @return the new set
2103	>	* @since 1.8
2104	>	*/
2105	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2106	>	return new KeySetView<K,Boolean>
2107	>	(new ConcurrentHashMapV8<K,Boolean>(), Boolean.TRUE);
2108	>	}
2109	>
2110	>	/**
2111	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2112	>	* from the given type to {@code Boolean.TRUE}.
2113	>	*
2114	>	* @param initialCapacity The implementation performs internal
2115	>	* sizing to accommodate this many elements.
2116	>	* @return the new set
2117	>	* @throws IllegalArgumentException if the initial capacity of
2118	>	* elements is negative
2119	>	* @since 1.8
2120	>	*/
2121	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2122	>	return new KeySetView<K,Boolean>
2123	>	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2124	>	}
2125	>
2126	>	/**
2127	>	* Returns a {@link Set} view of the keys in this map, using the
2128	>	* given common mapped value for any additions (i.e., {@link
2129	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2130	>	* This is of course only appropriate if it is acceptable to use
2131	>	* the same value for all additions from this view.
2132	>	*
2133	>	* @param mappedValue the mapped value to use for any additions
2134	>	* @return the set view
2135	>	* @throws NullPointerException if the mappedValue is null
2136	>	*/
2137	>	public KeySetView<K,V> keySet(V mappedValue) {
2138	>	if (mappedValue == null)
2139	>	throw new NullPointerException();
2140	>	return new KeySetView<K,V>(this, mappedValue);
2141	>	}
2142	>
2143	>	/* ---------------- Special Nodes -------------- */
2144	>
2145	>	/**
2146	>	* A node inserted at head of bins during transfer operations.
2147	>	*/
2148	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2149	>	final Node<K,V>[] nextTable;
2150	>	ForwardingNode(Node<K,V>[] tab) {
2151	>	super(MOVED, null, null, null);
2152	>	this.nextTable = tab;
2153	>	}
2154	>
2155	>	Node<K,V> find(int h, Object k) {
2156	>	// loop to avoid arbitrarily deep recursion on forwarding nodes
2157	>	outer: for (Node<K,V>[] tab = nextTable;;) {
2158	>	Node<K,V> e; int n;
2159	>	if (k == null || tab == null || (n = tab.length) == 0 ||
2160	>	(e = tabAt(tab, (n - 1) & h)) == null)
2161	>	return null;
2162	>	for (;;) {
2163	>	int eh; K ek;
2164	>	if ((eh = e.hash) == h &&
2165	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2166	>	return e;
2167	>	if (eh < 0) {
2168	>	if (e instanceof ForwardingNode) {
2169	>	tab = ((ForwardingNode<K,V>)e).nextTable;
2170	>	continue outer;
2171	>	}
2172	>	else
2173	>	return e.find(h, k);
2174		}
2175	+	if ((e = e.next) == null)
2176	+	return null;
2177		}
2178		}
3319	–	return false;
2179		}
3321	–	public final Iterator<V> iterator() {
3322	–	return new ValueIterator<K,V>(map);
3323	–	}
3324	–	public final boolean add(V e) {
3325	–	throw new UnsupportedOperationException();
3326	–	}
3327	–	public final boolean addAll(Collection<? extends V> c) {
3328	–	throw new UnsupportedOperationException();
3329	–	}
3330	–
2180		}
2181
2182	<	static final class EntrySet<K,V> extends CHMView<K,V>
2183	<	implements Set<Map.Entry<K,V>> {
2184	<	EntrySet(ConcurrentHashMapV8<K, V> map) { super(map); }
2185	<	public final boolean contains(Object o) {
2186	<	Object k, v, r; Map.Entry<?,?> e;
2187	<	return ((o instanceof Map.Entry) &&
3339	<	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
3340	<	(r = map.get(k)) != null &&
3341	<	(v = e.getValue()) != null &&
3342	<	(v == r || v.equals(r)));
3343	<	}
3344	<	public final boolean remove(Object o) {
3345	<	Object k, v; Map.Entry<?,?> e;
3346	<	return ((o instanceof Map.Entry) &&
3347	<	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
3348	<	(v = e.getValue()) != null &&
3349	<	map.remove(k, v));
3350	<	}
3351	<	public final Iterator<Map.Entry<K,V>> iterator() {
3352	<	return new EntryIterator<K,V>(map);
3353	<	}
3354	<	public final boolean add(Entry<K,V> e) {
3355	<	throw new UnsupportedOperationException();
3356	<	}
3357	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
3358	<	throw new UnsupportedOperationException();
2182	>	/**
2183	>	* A place-holder node used in computeIfAbsent and compute
2184	>	*/
2185	>	static final class ReservationNode<K,V> extends Node<K,V> {
2186	>	ReservationNode() {
2187	>	super(RESERVED, null, null, null);
2188		}
2189	<	public boolean equals(Object o) {
2190	<	Set<?> c;
2191	<	return ((o instanceof Set) &&
3363	<	((c = (Set<?>)o) == this ||
3364	<	(containsAll(c) && c.containsAll(this))));
2189	>
2190	>	Node<K,V> find(int h, Object k) {
2191	>	return null;
2192		}
2193		}
2194
2195	<	/* ---------------- Serialization Support -------------- */
2195	>	/* ---------------- Table Initialization and Resizing -------------- */
2196
2197		/**
2198	<	* Stripped-down version of helper class used in previous version,
3372	<	* declared for the sake of serialization compatibility
2198	>	* Initializes table, using the size recorded in sizeCtl.
2199		*/
2200	<	static class Segment<K,V> implements Serializable {
2201	<	private static final long serialVersionUID = 2249069246763182397L;
2202	<	final float loadFactor;
2203	<	Segment(float lf) { this.loadFactor = lf; }
2200	>	private final Node<K,V>[] initTable() {
2201	>	Node<K,V>[] tab; int sc;
2202	>	while ((tab = table) == null || tab.length == 0) {
2203	>	if ((sc = sizeCtl) < 0)
2204	>	Thread.yield(); // lost initialization race; just spin
2205	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2206	>	try {
2207	>	if ((tab = table) == null || tab.length == 0) {
2208	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2209	>	@SuppressWarnings("unchecked")
2210	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2211	>	table = tab = nt;
2212	>	sc = n - (n >>> 2);
2213	>	}
2214	>	} finally {
2215	>	sizeCtl = sc;
2216	>	}
2217	>	break;
2218	>	}
2219	>	}
2220	>	return tab;
2221		}
2222
2223		/**
2224	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
2225	<	* stream (i.e., serializes it).
2226	<	* @param s the stream
2227	<	* @serialData
2228	<	* the key (Object) and value (Object)
2229	<	* for each key-value mapping, followed by a null pair.
2230	<	* The key-value mappings are emitted in no particular order.
2231	<	*/
2232	<	@SuppressWarnings("unchecked") private void writeObject(java.io.ObjectOutputStream s)
2233	<	throws java.io.IOException {
2234	<	if (segments == null) { // for serialization compatibility
2235	<	segments = (Segment<K,V>[])
2236	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
2237	<	for (int i = 0; i < segments.length; ++i)
2238	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
2239	<	}
2240	<	s.defaultWriteObject();
2241	<	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2242	<	Object v;
2243	<	while ((v = it.advance()) != null) {
2244	<	s.writeObject(it.nextKey);
2245	<	s.writeObject(v);
2224	>	* Adds to count, and if table is too small and not already
2225	>	* resizing, initiates transfer. If already resizing, helps
2226	>	* perform transfer if work is available.  Rechecks occupancy
2227	>	* after a transfer to see if another resize is already needed
2228	>	* because resizings are lagging additions.
2229	>	*
2230	>	* @param x the count to add
2231	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
2232	>	*/
2233	>	private final void addCount(long x, int check) {
2234	>	CounterCell[] as; long b, s;
2235	>	if ((as = counterCells) != null ||
2236	>	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2237	>	CounterHashCode hc; CounterCell a; long v; int m;
2238	>	boolean uncontended = true;
2239	>	if ((hc = threadCounterHashCode.get()) == null ||
2240	>	as == null || (m = as.length - 1) < 0 ||
2241	>	(a = as[m & hc.code]) == null ||
2242	>	!(uncontended =
2243	>	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
2244	>	fullAddCount(x, hc, uncontended);
2245	>	return;
2246	>	}
2247	>	if (check <= 1)
2248	>	return;
2249	>	s = sumCount();
2250	>	}
2251	>	if (check >= 0) {
2252	>	Node<K,V>[] tab, nt; int sc;
2253	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2254	>	tab.length < MAXIMUM_CAPACITY) {
2255	>	if (sc < 0) {
2256	>	if (sc == -1 || transferIndex <= 0 ||
2257	>	(nt = nextTable) == null)
2258	>	break;
2259	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
2260	>	transfer(tab, nt);
2261	>	}
2262	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -2))
2263	>	transfer(tab, null);
2264	>	s = sumCount();
2265	>	}
2266		}
3404	–	s.writeObject(null);
3405	–	s.writeObject(null);
3406	–	segments = null; // throw away
2267		}
2268
2269		/**
2270	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3411	<	* @param s the stream
2270	>	* Helps transfer if a resize is in progress.
2271		*/
2272	<	@SuppressWarnings("unchecked") private void readObject(java.io.ObjectInputStream s)
2273	<	throws java.io.IOException, ClassNotFoundException {
2274	<	s.defaultReadObject();
2275	<	this.segments = null; // unneeded
2276	<	// initialize transient final field
2277	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
2272	>	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2273	>	Node<K,V>[] nextTab; int sc;
2274	>	if ((f instanceof ForwardingNode) &&
2275	>	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2276	>	while (transferIndex > 0 && nextTab == nextTable &&
2277	>	(sc = sizeCtl) < -1) {
2278	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1)) {
2279	>	transfer(tab, nextTab);
2280	>	break;
2281	>	}
2282	>	}
2283	>	return nextTab;
2284	>	}
2285	>	return table;
2286	>	}
2287
2288	<	// Create all nodes, then place in table once size is known
2289	<	long size = 0L;
2290	<	Node p = null;
2291	<	for (;;) {
2292	<	K k = (K) s.readObject();
2293	<	V v = (V) s.readObject();
2294	<	if (k != null && v != null) {
2295	<	int h = spread(k.hashCode());
2296	<	p = new Node(h, k, v, p);
2297	<	++size;
2288	>	/**
2289	>	* Tries to presize table to accommodate the given number of elements.
2290	>	*
2291	>	* @param size number of elements (doesn't need to be perfectly accurate)
2292	>	*/
2293	>	private final void tryPresize(int size) {
2294	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2295	>	tableSizeFor(size + (size >>> 1) + 1);
2296	>	int sc;
2297	>	while ((sc = sizeCtl) >= 0) {
2298	>	Node<K,V>[] tab = table; int n;
2299	>	if (tab == null || (n = tab.length) == 0) {
2300	>	n = (sc > c) ? sc : c;
2301	>	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2302	>	try {
2303	>	if (table == tab) {
2304	>	@SuppressWarnings("unchecked")
2305	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2306	>	table = nt;
2307	>	sc = n - (n >>> 2);
2308	>	}
2309	>	} finally {
2310	>	sizeCtl = sc;
2311	>	}
2312	>	}
2313		}
2314	<	else
2314	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2315		break;
2316	+	else if (tab == table &&
2317	+	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2318	+	transfer(tab, null);
2319		}
2320	<	if (p != null) {
2321	<	boolean init = false;
2322	<	int n;
2323	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
2324	<	n = MAXIMUM_CAPACITY;
2325	<	else {
2326	<	int sz = (int)size;
2327	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
2320	>	}
2321	>
2322	>	/**
2323	>	* Moves and/or copies the nodes in each bin to new table. See
2324	>	* above for explanation.
2325	>	*/
2326	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2327	>	int n = tab.length, stride;
2328	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2329	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
2330	>	if (nextTab == null) {            // initiating
2331	>	try {
2332	>	@SuppressWarnings("unchecked")
2333	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n << 1];
2334	>	nextTab = nt;
2335	>	} catch (Throwable ex) {      // try to cope with OOME
2336	>	sizeCtl = Integer.MAX_VALUE;
2337	>	return;
2338	>	}
2339	>	nextTable = nextTab;
2340	>	transferIndex = n;
2341	>	}
2342	>	int nextn = nextTab.length;
2343	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2344	>	boolean advance = true;
2345	>	boolean finishing = false; // to ensure sweep before committing nextTab
2346	>	for (int i = 0, bound = 0;;) {
2347	>	Node<K,V> f; int fh;
2348	>	while (advance) {
2349	>	int nextIndex, nextBound;
2350	>	if (--i >= bound || finishing)
2351	>	advance = false;
2352	>	else if ((nextIndex = transferIndex) <= 0) {
2353	>	i = -1;
2354	>	advance = false;
2355	>	}
2356	>	else if (U.compareAndSwapInt
2357	>	(this, TRANSFERINDEX, nextIndex,
2358	>	nextBound = (nextIndex > stride ?
2359	>	nextIndex - stride : 0))) {
2360	>	bound = nextBound;
2361	>	i = nextIndex - 1;
2362	>	advance = false;
2363	>	}
2364	>	}
2365	>	if (i < 0 || i >= n || i + n >= nextn) {
2366	>	int sc;
2367	>	if (finishing) {
2368	>	nextTable = null;
2369	>	table = nextTab;
2370	>	sizeCtl = (n << 1) - (n >>> 1);
2371	>	return;
2372	>	}
2373	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, ++sc)) {
2374	>	if (sc != -1)
2375	>	return;
2376	>	finishing = advance = true;
2377	>	i = n; // recheck before commit
2378	>	}
2379		}
2380	<	int sc = sizeCtl;
2381	<	boolean collide = false;
2382	<	if (n > sc &&
2383	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
2384	<	try {
2385	<	if (table == null) {
2386	<	init = true;
2387	<	Node[] tab = new Node[n];
2388	<	int mask = n - 1;
2389	<	while (p != null) {
2390	<	int j = p.hash & mask;
2391	<	Node next = p.next;
2392	<	Node q = p.next = tabAt(tab, j);
2393	<	setTabAt(tab, j, p);
2394	<	if (!collide && q != null && q.hash == p.hash)
2395	<	collide = true;
2396	<	p = next;
2380	>	else if ((f = tabAt(tab, i)) == null)
2381	>	advance = casTabAt(tab, i, null, fwd);
2382	>	else if ((fh = f.hash) == MOVED)
2383	>	advance = true; // already processed
2384	>	else {
2385	>	synchronized (f) {
2386	>	if (tabAt(tab, i) == f) {
2387	>	Node<K,V> ln, hn;
2388	>	if (fh >= 0) {
2389	>	int runBit = fh & n;
2390	>	Node<K,V> lastRun = f;
2391	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2392	>	int b = p.hash & n;
2393	>	if (b != runBit) {
2394	>	runBit = b;
2395	>	lastRun = p;
2396	>	}
2397	>	}
2398	>	if (runBit == 0) {
2399	>	ln = lastRun;
2400	>	hn = null;
2401	>	}
2402	>	else {
2403	>	hn = lastRun;
2404	>	ln = null;
2405	>	}
2406	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2407	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2408	>	if ((ph & n) == 0)
2409	>	ln = new Node<K,V>(ph, pk, pv, ln);
2410	>	else
2411	>	hn = new Node<K,V>(ph, pk, pv, hn);
2412	>	}
2413	>	setTabAt(nextTab, i, ln);
2414	>	setTabAt(nextTab, i + n, hn);
2415	>	setTabAt(tab, i, fwd);
2416	>	advance = true;
2417		}
2418	<	table = tab;
2419	<	counter.add(size);
2420	<	sc = n - (n >>> 2);
2421	<	}
2422	<	} finally {
2423	<	sizeCtl = sc;
2424	<	}
2425	<	if (collide) { // rescan and convert to TreeBins
2426	<	Node[] tab = table;
2427	<	for (int i = 0; i < tab.length; ++i) {
2428	<	int c = 0;
2429	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
2430	<	if (++c > TREE_THRESHOLD &&
2431	<	(e.key instanceof Comparable)) {
2432	<	replaceWithTreeBin(tab, i, e.key);
2433	<	break;
2418	>	else if (f instanceof TreeBin) {
2419	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2420	>	TreeNode<K,V> lo = null, loTail = null;
2421	>	TreeNode<K,V> hi = null, hiTail = null;
2422	>	int lc = 0, hc = 0;
2423	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2424	>	int h = e.hash;
2425	>	TreeNode<K,V> p = new TreeNode<K,V>
2426	>	(h, e.key, e.val, null, null);
2427	>	if ((h & n) == 0) {
2428	>	if ((p.prev = loTail) == null)
2429	>	lo = p;
2430	>	else
2431	>	loTail.next = p;
2432	>	loTail = p;
2433	>	++lc;
2434	>	}
2435	>	else {
2436	>	if ((p.prev = hiTail) == null)
2437	>	hi = p;
2438	>	else
2439	>	hiTail.next = p;
2440	>	hiTail = p;
2441	>	++hc;
2442	>	}
2443		}
2444	+	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2445	+	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2446	+	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2447	+	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2448	+	setTabAt(nextTab, i, ln);
2449	+	setTabAt(nextTab, i + n, hn);
2450	+	setTabAt(tab, i, fwd);
2451	+	advance = true;
2452		}
2453		}
2454		}
2455		}
3482	–	if (!init) { // Can only happen if unsafely published.
3483	–	while (p != null) {
3484	–	internalPut(p.key, p.val);
3485	–	p = p.next;
3486	–	}
3487	–	}
2456		}
2457		}
2458
2459	+	/* ---------------- Conversion from/to TreeBins -------------- */
2460
2461	<	// -------------------------------------------------------
2462	<
2463	<	// Sams
2464	<	/** Interface describing a void action of one argument */
2465	<	public interface Action<A> { void apply(A a); }
2466	<	/** Interface describing a void action of two arguments */
2467	<	public interface BiAction<A,B> { void apply(A a, B b); }
2468	<	/** Interface describing a function of one argument */
2469	<	public interface Fun<A,T> { T apply(A a); }
2470	<	/** Interface describing a function of two arguments */
2471	<	public interface BiFun<A,B,T> { T apply(A a, B b); }
2472	<	/** Interface describing a function of no arguments */
2473	<	public interface Generator<T> { T apply(); }
2474	<	/** Interface describing a function mapping its argument to a double */
2475	<	public interface ObjectToDouble<A> { double apply(A a); }
2476	<	/** Interface describing a function mapping its argument to a long */
2477	<	public interface ObjectToLong<A> { long apply(A a); }
2478	<	/** Interface describing a function mapping its argument to an int */
2479	<	public interface ObjectToInt<A> {int apply(A a); }
2480	<	/** Interface describing a function mapping two arguments to a double */
2481	<	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
2482	<	/** Interface describing a function mapping two arguments to a long */
2483	<	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
2484	<	/** Interface describing a function mapping two arguments to an int */
2485	<	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
2486	<	/** Interface describing a function mapping a double to a double */
2487	<	public interface DoubleToDouble { double apply(double a); }
2488	<	/** Interface describing a function mapping a long to a long */
2489	<	public interface LongToLong { long apply(long a); }
2490	<	/** Interface describing a function mapping an int to an int */
2491	<	public interface IntToInt { int apply(int a); }
2492	<	/** Interface describing a function mapping two doubles to a double */
3524	<	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3525	<	/** Interface describing a function mapping two longs to a long */
3526	<	public interface LongByLongToLong { long apply(long a, long b); }
3527	<	/** Interface describing a function mapping two ints to an int */
3528	<	public interface IntByIntToInt { int apply(int a, int b); }
3529	<
3530	<
3531	<	// -------------------------------------------------------
2461	>	/**
2462	>	* Replaces all linked nodes in bin at given index unless table is
2463	>	* too small, in which case resizes instead.
2464	>	*/
2465	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2466	>	Node<K,V> b; int n, sc;
2467	>	if (tab != null) {
2468	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY) {
2469	>	if (tab == table && (sc = sizeCtl) >= 0 &&
2470	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
2471	>	transfer(tab, null);
2472	>	}
2473	>	else if ((b = tabAt(tab, index)) != null && b.hash >= 0) {
2474	>	synchronized (b) {
2475	>	if (tabAt(tab, index) == b) {
2476	>	TreeNode<K,V> hd = null, tl = null;
2477	>	for (Node<K,V> e = b; e != null; e = e.next) {
2478	>	TreeNode<K,V> p =
2479	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2480	>	null, null);
2481	>	if ((p.prev = tl) == null)
2482	>	hd = p;
2483	>	else
2484	>	tl.next = p;
2485	>	tl = p;
2486	>	}
2487	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2488	>	}
2489	>	}
2490	>	}
2491	>	}
2492	>	}
2493
2494		/**
2495	<	* Returns an extended {@link Parallel} view of this map using the
3535	<	* given executor for bulk parallel operations.
3536	<	*
3537	<	* @param executor the executor
3538	<	* @return a parallel view
2495	>	* Returns a list on non-TreeNodes replacing those in given list.
2496		*/
2497	<	public Parallel parallel(ForkJoinPool executor)  {
2498	<	return new Parallel(executor);
2497	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2498	>	Node<K,V> hd = null, tl = null;
2499	>	for (Node<K,V> q = b; q != null; q = q.next) {
2500	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2501	>	if (tl == null)
2502	>	hd = p;
2503	>	else
2504	>	tl.next = p;
2505	>	tl = p;
2506	>	}
2507	>	return hd;
2508		}
2509
2510	+	/* ---------------- TreeNodes -------------- */
2511	+
2512		/**
2513	<	* An extended view of a ConcurrentHashMap supporting bulk
3546	<	* parallel operations. These operations are designed to be
3547	<	* safely, and often sensibly, applied even with maps that are
3548	<	* being concurrently updated by other threads; for example, when
3549	<	* computing a snapshot summary of the values in a shared
3550	<	* registry.  There are three kinds of operation, each with four
3551	<	* forms, accepting functions with Keys, Values, Entries, and
3552	<	* (Key, Value) arguments and/or return values. Because the
3553	<	* elements of a ConcurrentHashMap are not ordered in any
3554	<	* particular way, and may be processed in different orders in
3555	<	* different parallel executions, the correctness of supplied
3556	<	* functions should not depend on any ordering, or on any other
3557	<	* objects or values that may transiently change while computation
3558	<	* is in progress; and except for forEach actions, should ideally
3559	<	* be side-effect-free.
3560	<	*
3561	<	* <ul>
3562	<	* <li> forEach: Perform a given action on each element.
3563	<	* A variant form applies a given transformation on each element
3564	<	* before performing the action.</li>
3565	<	*
3566	<	* <li> search: Return the first available non-null result of
3567	<	* applying a given function on each element; skipping further
3568	<	* search when a result is found.</li>
3569	<	*
3570	<	* <li> reduce: Accumulate each element.  The supplied reduction
3571	<	* function cannot rely on ordering (more formally, it should be
3572	<	* both associative and commutative).  There are five variants:
3573	<	*
3574	<	* <ul>
3575	<	*
3576	<	* <li> Plain reductions. (There is not a form of this method for
3577	<	* (key, value) function arguments since there is no corresponding
3578	<	* return type.)</li>
3579	<	*
3580	<	* <li> Mapped reductions that accumulate the results of a given
3581	<	* function applied to each element.</li>
3582	<	*
3583	<	* <li> Reductions to scalar doubles, longs, and ints, using a
3584	<	* given basis value.</li>
3585	<	*
3586	<	* </li>
3587	<	* </ul>
3588	<	* </ul>
3589	<	*
3590	<	* <p>The concurrency properties of the bulk operations follow
3591	<	* from those of ConcurrentHashMap: Any non-null result returned
3592	<	* from {@code get(key)} and related access methods bears a
3593	<	* happens-before relation with the associated insertion or
3594	<	* update.  The result of any bulk operation reflects the
3595	<	* composition of these per-element relations (but is not
3596	<	* necessarily atomic with respect to the map as a whole unless it
3597	<	* is somehow known to be quiescent).  Conversely, because keys
3598	<	* and values in the map are never null, null serves as a reliable
3599	<	* atomic indicator of the current lack of any result.  To
3600	<	* maintain this property, null serves as an implicit basis for
3601	<	* all non-scalar reduction operations. For the double, long, and
3602	<	* int versions, the basis should be one that, when combined with
3603	<	* any other value, returns that other value (more formally, it
3604	<	* should be the identity element for the reduction). Most common
3605	<	* reductions have these properties; for example, computing a sum
3606	<	* with basis 0 or a minimum with basis MAX_VALUE.
3607	<	*
3608	<	* <p>Search and transformation functions provided as arguments
3609	<	* should similarly return null to indicate the lack of any result
3610	<	* (in which case it is not used). In the case of mapped
3611	<	* reductions, this also enables transformations to serve as
3612	<	* filters, returning null (or, in the case of primitive
3613	<	* specializations, the identity basis) if the element should not
3614	<	* be combined. You can create compound transformations and
3615	<	* filterings by composing them yourself under this "null means
3616	<	* there is nothing there now" rule before using them in search or
3617	<	* reduce operations.
3618	<	*
3619	<	* <p>Methods accepting and/or returning Entry arguments maintain
3620	<	* key-value associations. They may be useful for example when
3621	<	* finding the key for the greatest value. Note that "plain" Entry
3622	<	* arguments can be supplied using {@code new
3623	<	* AbstractMap.SimpleEntry(k,v)}.
3624	<	*
3625	<	* <p> Bulk operations may complete abruptly, throwing an
3626	<	* exception encountered in the application of a supplied
3627	<	* function. Bear in mind when handling such exceptions that other
3628	<	* concurrently executing functions could also have thrown
3629	<	* exceptions, or would have done so if the first exception had
3630	<	* not occurred.
3631	<	*
3632	<	* <p>Parallel speedups compared to sequential processing are
3633	<	* common but not guaranteed.  Operations involving brief
3634	<	* functions on small maps may execute more slowly than sequential
3635	<	* loops if the underlying work to parallelize the computation is
3636	<	* more expensive than the computation itself. Similarly,
3637	<	* parallelization may not lead to much actual parallelism if all
3638	<	* processors are busy performing unrelated tasks.
3639	<	*
3640	<	* <p> All arguments to all task methods must be non-null.
3641	<	*
3642	<	* <p><em>jsr166e note: During transition, this class
3643	<	* uses nested functional interfaces with different names but the
3644	<	* same forms as those expected for JDK8.<em>
2513	>	* Nodes for use in TreeBins
2514		*/
2515	<	public class Parallel {
2516	<	final ForkJoinPool fjp;
2515	>	static final class TreeNode<K,V> extends Node<K,V> {
2516	>	TreeNode<K,V> parent;  // red-black tree links
2517	>	TreeNode<K,V> left;
2518	>	TreeNode<K,V> right;
2519	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2520	>	boolean red;
2521
2522	<	/**
2523	<	* Returns an extended view of this map using the given
2524	<	* executor for bulk parallel operations.
2525	<	*
3653	<	* @param executor the executor
3654	<	*/
3655	<	public Parallel(ForkJoinPool executor)  {
3656	<	this.fjp = executor;
2522	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2523	>	TreeNode<K,V> parent) {
2524	>	super(hash, key, val, next);
2525	>	this.parent = parent;
2526		}
2527
2528	<	/**
2529	<	* Performs the given action for each (key, value).
3661	<	*
3662	<	* @param action the action
3663	<	*/
3664	<	public void forEach(BiAction<K,V> action) {
3665	<	fjp.invoke(ForkJoinTasks.forEach
3666	<	(ConcurrentHashMapV8.this, action));
2528	>	Node<K,V> find(int h, Object k) {
2529	>	return findTreeNode(h, k, null);
2530		}
2531
2532		/**
2533	<	* Performs the given action for each non-null transformation
2534	<	* of each (key, value).
3672	<	*
3673	<	* @param transformer a function returning the transformation
3674	<	* for an element, or null of there is no transformation (in
3675	<	* which case the action is not applied).
3676	<	* @param action the action
2533	>	* Returns the TreeNode (or null if not found) for the given key
2534	>	* starting at given root.
2535		*/
2536	<	public <U> void forEach(BiFun<? super K, ? super V, ? extends U> transformer,
2537	<	Action<U> action) {
2538	<	fjp.invoke(ForkJoinTasks.forEach
2539	<	(ConcurrentHashMapV8.this, transformer, action));
2536	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2537	>	if (k != null) {
2538	>	TreeNode<K,V> p = this;
2539	>	do  {
2540	>	int ph, dir; K pk; TreeNode<K,V> q;
2541	>	TreeNode<K,V> pl = p.left, pr = p.right;
2542	>	if ((ph = p.hash) > h)
2543	>	p = pl;
2544	>	else if (ph < h)
2545	>	p = pr;
2546	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2547	>	return p;
2548	>	else if (pl == null)
2549	>	p = pr;
2550	>	else if (pr == null)
2551	>	p = pl;
2552	>	else if ((kc != null ||
2553	>	(kc = comparableClassFor(k)) != null) &&
2554	>	(dir = compareComparables(kc, k, pk)) != 0)
2555	>	p = (dir < 0) ? pl : pr;
2556	>	else if ((q = pr.findTreeNode(h, k, kc)) != null)
2557	>	return q;
2558	>	else
2559	>	p = pl;
2560	>	} while (p != null);
2561	>	}
2562	>	return null;
2563		}
2564	+	}
2565
2566	<	/**
2567	<	* Returns a non-null result from applying the given search
2568	<	* function on each (key, value), or null if none.  Upon
2569	<	* success, further element processing is suppressed and the
2570	<	* results of any other parallel invocations of the search
2571	<	* function are ignored.
2572	<	*
2573	<	* @param searchFunction a function returning a non-null
2574	<	* result on success, else null
2575	<	* @return a non-null result from applying the given search
2576	<	* function on each (key, value), or null if none
2577	<	*/
2578	<	public <U> U search(BiFun<? super K, ? super V, ? extends U> searchFunction) {
2579	<	return fjp.invoke(ForkJoinTasks.search
2580	<	(ConcurrentHashMapV8.this, searchFunction));
2566	>	/* ---------------- TreeBins -------------- */
2567	>
2568	>	/**
2569	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2570	>	* keys or values, but instead point to list of TreeNodes and
2571	>	* their root. They also maintain a parasitic read-write lock
2572	>	* forcing writers (who hold bin lock) to wait for readers (who do
2573	>	* not) to complete before tree restructuring operations.
2574	>	*/
2575	>	static final class TreeBin<K,V> extends Node<K,V> {
2576	>	TreeNode<K,V> root;
2577	>	volatile TreeNode<K,V> first;
2578	>	volatile Thread waiter;
2579	>	volatile int lockState;
2580	>	// values for lockState
2581	>	static final int WRITER = 1; // set while holding write lock
2582	>	static final int WAITER = 2; // set when waiting for write lock
2583	>	static final int READER = 4; // increment value for setting read lock
2584	>
2585	>	/**
2586	>	* Tie-breaking utility for ordering insertions when equal
2587	>	* hashCodes and non-comparable. We don't require a total
2588	>	* order, just a consistent insertion rule to maintain
2589	>	* equivalence across rebalancings. Tie-breaking further than
2590	>	* necessary simplifies testing a bit.
2591	>	*/
2592	>	static int tieBreakOrder(Object a, Object b) {
2593	>	int d;
2594	>	if (a == null || b == null ||
2595	>	(d = a.getClass().getName().
2596	>	compareTo(b.getClass().getName())) == 0)
2597	>	d = (System.identityHashCode(a) <= System.identityHashCode(b) ?
2598	>	-1 : 1);
2599	>	return d;
2600		}
2601
2602		/**
2603	<	* Returns the result of accumulating the given transformation
2604	<	* of all (key, value) pairs using the given reducer to
2605	<	* combine values, or null if none.
2606	<	*
2607	<	* @param transformer a function returning the transformation
2608	<	* for an element, or null of there is no transformation (in
2609	<	* which case it is not combined).
2610	<	* @param reducer a commutative associative combining function
2611	<	* @return the result of accumulating the given transformation
2612	<	* of all (key, value) pairs
2613	<	*/
2614	<	public <U> U reduce(BiFun<? super K, ? super V, ? extends U> transformer,
2615	<	BiFun<? super U, ? super U, ? extends U> reducer) {
2616	<	return fjp.invoke(ForkJoinTasks.reduce
2617	<	(ConcurrentHashMapV8.this, transformer, reducer));
2603	>	* Creates bin with initial set of nodes headed by b.
2604	>	*/
2605	>	TreeBin(TreeNode<K,V> b) {
2606	>	super(TREEBIN, null, null, null);
2607	>	this.first = b;
2608	>	TreeNode<K,V> r = null;
2609	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2610	>	next = (TreeNode<K,V>)x.next;
2611	>	x.left = x.right = null;
2612	>	if (r == null) {
2613	>	x.parent = null;
2614	>	x.red = false;
2615	>	r = x;
2616	>	}
2617	>	else {
2618	>	K k = x.key;
2619	>	int h = x.hash;
2620	>	Class<?> kc = null;
2621	>	for (TreeNode<K,V> p = r;;) {
2622	>	int dir, ph;
2623	>	K pk = p.key;
2624	>	if ((ph = p.hash) > h)
2625	>	dir = -1;
2626	>	else if (ph < h)
2627	>	dir = 1;
2628	>	else if ((kc == null &&
2629	>	(kc = comparableClassFor(k)) == null) ||
2630	>	(dir = compareComparables(kc, k, pk)) == 0)
2631	>	dir = tieBreakOrder(k, pk);
2632	>	TreeNode<K,V> xp = p;
2633	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2634	>	x.parent = xp;
2635	>	if (dir <= 0)
2636	>	xp.left = x;
2637	>	else
2638	>	xp.right = x;
2639	>	r = balanceInsertion(r, x);
2640	>	break;
2641	>	}
2642	>	}
2643	>	}
2644	>	}
2645	>	this.root = r;
2646	>	assert checkInvariants(root);
2647		}
2648
2649		/**
2650	<	* Returns the result of accumulating the given transformation
3721	<	* of all (key, value) pairs using the given reducer to
3722	<	* combine values, and the given basis as an identity value.
3723	<	*
3724	<	* @param transformer a function returning the transformation
3725	<	* for an element
3726	<	* @param basis the identity (initial default value) for the reduction
3727	<	* @param reducer a commutative associative combining function
3728	<	* @return the result of accumulating the given transformation
3729	<	* of all (key, value) pairs
2650	>	* Acquires write lock for tree restructuring.
2651		*/
2652	<	public double reduceToDouble(ObjectByObjectToDouble<? super K, ? super V> transformer,
2653	<	double basis,
2654	<	DoubleByDoubleToDouble reducer) {
3734	<	return fjp.invoke(ForkJoinTasks.reduceToDouble
3735	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
2652	>	private final void lockRoot() {
2653	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2654	>	contendedLock(); // offload to separate method
2655		}
2656
2657		/**
2658	<	* Returns the result of accumulating the given transformation
3740	<	* of all (key, value) pairs using the given reducer to
3741	<	* combine values, and the given basis as an identity value.
3742	<	*
3743	<	* @param transformer a function returning the transformation
3744	<	* for an element
3745	<	* @param basis the identity (initial default value) for the reduction
3746	<	* @param reducer a commutative associative combining function
3747	<	* @return the result of accumulating the given transformation
3748	<	* of all (key, value) pairs
2658	>	* Releases write lock for tree restructuring.
2659		*/
2660	<	public long reduceToLong(ObjectByObjectToLong<? super K, ? super V> transformer,
2661	<	long basis,
3752	<	LongByLongToLong reducer) {
3753	<	return fjp.invoke(ForkJoinTasks.reduceToLong
3754	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
2660	>	private final void unlockRoot() {
2661	>	lockState = 0;
2662		}
2663
2664		/**
2665	<	* Returns the result of accumulating the given transformation
3759	<	* of all (key, value) pairs using the given reducer to
3760	<	* combine values, and the given basis as an identity value.
3761	<	*
3762	<	* @param transformer a function returning the transformation
3763	<	* for an element
3764	<	* @param basis the identity (initial default value) for the reduction
3765	<	* @param reducer a commutative associative combining function
3766	<	* @return the result of accumulating the given transformation
3767	<	* of all (key, value) pairs
2665	>	* Possibly blocks awaiting root lock.
2666		*/
2667	<	public int reduceToInt(ObjectByObjectToInt<? super K, ? super V> transformer,
2668	<	int basis,
2669	<	IntByIntToInt reducer) {
2670	<	return fjp.invoke(ForkJoinTasks.reduceToInt
2671	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
2667	>	private final void contendedLock() {
2668	>	boolean waiting = false;
2669	>	for (int s;;) {
2670	>	if (((s = lockState) & WRITER) == 0) {
2671	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2672	>	if (waiting)
2673	>	waiter = null;
2674	>	return;
2675	>	}
2676	>	}
2677	>	else if ((s & WAITER) == 0) {
2678	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2679	>	waiting = true;
2680	>	waiter = Thread.currentThread();
2681	>	}
2682	>	}
2683	>	else if (waiting)
2684	>	LockSupport.park(this);
2685	>	}
2686		}
2687
2688		/**
2689	<	* Performs the given action for each key.
2690	<	*
2691	<	* @param action the action
2689	>	* Returns matching node or null if none. Tries to search
2690	>	* using tree comparisons from root, but continues linear
2691	>	* search when lock not available.
2692		*/
2693	<	public void forEachKey(Action<K> action) {
2694	<	fjp.invoke(ForkJoinTasks.forEachKey
2695	<	(ConcurrentHashMapV8.this, action));
2693	>	final Node<K,V> find(int h, Object k) {
2694	>	if (k != null) {
2695	>	for (Node<K,V> e = first; e != null; e = e.next) {
2696	>	int s; K ek;
2697	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2698	>	if (e.hash == h &&
2699	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2700	>	return e;
2701	>	}
2702	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2703	>	s + READER)) {
2704	>	TreeNode<K,V> r, p;
2705	>	try {
2706	>	p = ((r = root) == null ? null :
2707	>	r.findTreeNode(h, k, null));
2708	>	} finally {
2709	>	Thread w;
2710	>	int ls;
2711	>	do {} while (!U.compareAndSwapInt
2712	>	(this, LOCKSTATE,
2713	>	ls = lockState, ls - READER));
2714	>	if (ls == (READER|WAITER) && (w = waiter) != null)
2715	>	LockSupport.unpark(w);
2716	>	}
2717	>	return p;
2718	>	}
2719	>	}
2720	>	}
2721	>	return null;
2722		}
2723
2724		/**
2725	<	* Performs the given action for each non-null transformation
2726	<	* of each key.
3789	<	*
3790	<	* @param transformer a function returning the transformation
3791	<	* for an element, or null of there is no transformation (in
3792	<	* which case the action is not applied).
3793	<	* @param action the action
2725	>	* Finds or adds a node.
2726	>	* @return null if added
2727		*/
2728	<	public <U> void forEachKey(Fun<? super K, ? extends U> transformer,
2729	<	Action<U> action) {
2730	<	fjp.invoke(ForkJoinTasks.forEachKey
2731	<	(ConcurrentHashMapV8.this, transformer, action));
2728	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2729	>	Class<?> kc = null;
2730	>	boolean searched = false;
2731	>	for (TreeNode<K,V> p = root;;) {
2732	>	int dir, ph; K pk;
2733	>	if (p == null) {
2734	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2735	>	break;
2736	>	}
2737	>	else if ((ph = p.hash) > h)
2738	>	dir = -1;
2739	>	else if (ph < h)
2740	>	dir = 1;
2741	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2742	>	return p;
2743	>	else if ((kc == null &&
2744	>	(kc = comparableClassFor(k)) == null) ||
2745	>	(dir = compareComparables(kc, k, pk)) == 0) {
2746	>	if (!searched) {
2747	>	TreeNode<K,V> q, ch;
2748	>	searched = true;
2749	>	if (((ch = p.left) != null &&
2750	>	(q = ch.findTreeNode(h, k, kc)) != null) ||
2751	>	((ch = p.right) != null &&
2752	>	(q = ch.findTreeNode(h, k, kc)) != null))
2753	>	return q;
2754	>	}
2755	>	dir = tieBreakOrder(k, pk);
2756	>	}
2757	>
2758	>	TreeNode<K,V> xp = p;
2759	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2760	>	TreeNode<K,V> x, f = first;
2761	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2762	>	if (f != null)
2763	>	f.prev = x;
2764	>	if (dir <= 0)
2765	>	xp.left = x;
2766	>	else
2767	>	xp.right = x;
2768	>	if (!xp.red)
2769	>	x.red = true;
2770	>	else {
2771	>	lockRoot();
2772	>	try {
2773	>	root = balanceInsertion(root, x);
2774	>	} finally {
2775	>	unlockRoot();
2776	>	}
2777	>	}
2778	>	break;
2779	>	}
2780	>	}
2781	>	assert checkInvariants(root);
2782	>	return null;
2783		}
2784
2785		/**
2786	<	* Returns a non-null result from applying the given search
2787	<	* function on each key, or null if none. Upon success,
2788	<	* further element processing is suppressed and the results of
2789	<	* any other parallel invocations of the search function are
2790	<	* ignored.
2786	>	* Removes the given node, that must be present before this
2787	>	* call.  This is messier than typical red-black deletion code
2788	>	* because we cannot swap the contents of an interior node
2789	>	* with a leaf successor that is pinned by "next" pointers
2790	>	* that are accessible independently of lock. So instead we
2791	>	* swap the tree linkages.
2792		*
2793	<	* @param searchFunction a function returning a non-null
3809	<	* result on success, else null
3810	<	* @return a non-null result from applying the given search
3811	<	* function on each key, or null if none
2793	>	* @return true if now too small, so should be untreeified
2794		*/
2795	<	public <U> U searchKeys(Fun<? super K, ? extends U> searchFunction) {
2796	<	return fjp.invoke(ForkJoinTasks.searchKeys
2797	<	(ConcurrentHashMapV8.this, searchFunction));
2795	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2796	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2797	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2798	>	TreeNode<K,V> r, rl;
2799	>	if (pred == null)
2800	>	first = next;
2801	>	else
2802	>	pred.next = next;
2803	>	if (next != null)
2804	>	next.prev = pred;
2805	>	if (first == null) {
2806	>	root = null;
2807	>	return true;
2808	>	}
2809	>	if ((r = root) == null || r.right == null || // too small
2810	>	(rl = r.left) == null || rl.left == null)
2811	>	return true;
2812	>	lockRoot();
2813	>	try {
2814	>	TreeNode<K,V> replacement;
2815	>	TreeNode<K,V> pl = p.left;
2816	>	TreeNode<K,V> pr = p.right;
2817	>	if (pl != null && pr != null) {
2818	>	TreeNode<K,V> s = pr, sl;
2819	>	while ((sl = s.left) != null) // find successor
2820	>	s = sl;
2821	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2822	>	TreeNode<K,V> sr = s.right;
2823	>	TreeNode<K,V> pp = p.parent;
2824	>	if (s == pr) { // p was s's direct parent
2825	>	p.parent = s;
2826	>	s.right = p;
2827	>	}
2828	>	else {
2829	>	TreeNode<K,V> sp = s.parent;
2830	>	if ((p.parent = sp) != null) {
2831	>	if (s == sp.left)
2832	>	sp.left = p;
2833	>	else
2834	>	sp.right = p;
2835	>	}
2836	>	if ((s.right = pr) != null)
2837	>	pr.parent = s;
2838	>	}
2839	>	p.left = null;
2840	>	if ((p.right = sr) != null)
2841	>	sr.parent = p;
2842	>	if ((s.left = pl) != null)
2843	>	pl.parent = s;
2844	>	if ((s.parent = pp) == null)
2845	>	r = s;
2846	>	else if (p == pp.left)
2847	>	pp.left = s;
2848	>	else
2849	>	pp.right = s;
2850	>	if (sr != null)
2851	>	replacement = sr;
2852	>	else
2853	>	replacement = p;
2854	>	}
2855	>	else if (pl != null)
2856	>	replacement = pl;
2857	>	else if (pr != null)
2858	>	replacement = pr;
2859	>	else
2860	>	replacement = p;
2861	>	if (replacement != p) {
2862	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2863	>	if (pp == null)
2864	>	r = replacement;
2865	>	else if (p == pp.left)
2866	>	pp.left = replacement;
2867	>	else
2868	>	pp.right = replacement;
2869	>	p.left = p.right = p.parent = null;
2870	>	}
2871	>
2872	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2873	>
2874	>	if (p == replacement) {  // detach pointers
2875	>	TreeNode<K,V> pp;
2876	>	if ((pp = p.parent) != null) {
2877	>	if (p == pp.left)
2878	>	pp.left = null;
2879	>	else if (p == pp.right)
2880	>	pp.right = null;
2881	>	p.parent = null;
2882	>	}
2883	>	}
2884	>	} finally {
2885	>	unlockRoot();
2886	>	}
2887	>	assert checkInvariants(root);
2888	>	return false;
2889		}
2890
2891	<	/**
2892	<	* Returns the result of accumulating all keys using the given
2893	<	* reducer to combine values, or null if none.
2894	<	*
2895	<	* @param reducer a commutative associative combining function
2896	<	* @return the result of accumulating all keys using the given
2897	<	* reducer to combine values, or null if none
2898	<	*/
2899	<	public K reduceKeys(BiFun<? super K, ? super K, ? extends K> reducer) {
2900	<	return fjp.invoke(ForkJoinTasks.reduceKeys
2901	<	(ConcurrentHashMapV8.this, reducer));
2891	>	/* ------------------------------------------------------------ */
2892	>	// Red-black tree methods, all adapted from CLR
2893	>
2894	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2895	>	TreeNode<K,V> p) {
2896	>	TreeNode<K,V> r, pp, rl;
2897	>	if (p != null && (r = p.right) != null) {
2898	>	if ((rl = p.right = r.left) != null)
2899	>	rl.parent = p;
2900	>	if ((pp = r.parent = p.parent) == null)
2901	>	(root = r).red = false;
2902	>	else if (pp.left == p)
2903	>	pp.left = r;
2904	>	else
2905	>	pp.right = r;
2906	>	r.left = p;
2907	>	p.parent = r;
2908	>	}
2909	>	return root;
2910		}
2911
2912	<	/**
2913	<	* Returns the result of accumulating the given transformation
2914	<	* of all keys using the given reducer to combine values, or
2915	<	* null if none.
2916	<	*
2917	<	* @param transformer a function returning the transformation
2918	<	* for an element, or null of there is no transformation (in
2919	<	* which case it is not combined).
2920	<	* @param reducer a commutative associative combining function
2921	<	* @return the result of accumulating the given transformation
2922	<	* of all keys
2923	<	*/
2924	<	public <U> U reduceKeys(Fun<? super K, ? extends U> transformer,
2925	<	BiFun<? super U, ? super U, ? extends U> reducer) {
2926	<	return fjp.invoke(ForkJoinTasks.reduceKeys
2927	<	(ConcurrentHashMapV8.this, transformer, reducer));
2912	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2913	>	TreeNode<K,V> p) {
2914	>	TreeNode<K,V> l, pp, lr;
2915	>	if (p != null && (l = p.left) != null) {
2916	>	if ((lr = p.left = l.right) != null)
2917	>	lr.parent = p;
2918	>	if ((pp = l.parent = p.parent) == null)
2919	>	(root = l).red = false;
2920	>	else if (pp.right == p)
2921	>	pp.right = l;
2922	>	else
2923	>	pp.left = l;
2924	>	l.right = p;
2925	>	p.parent = l;
2926	>	}
2927	>	return root;
2928		}
2929
2930	<	/**
2931	<	* Returns the result of accumulating the given transformation
2932	<	* of all keys using the given reducer to combine values, and
2933	<	* the given basis as an identity value.
2934	<	*
2935	<	* @param transformer a function returning the transformation
2936	<	* for an element
2937	<	* @param basis the identity (initial default value) for the reduction
2938	<	* @param reducer a commutative associative combining function
2939	<	* @return  the result of accumulating the given transformation
2940	<	* of all keys
2941	<	*/
2942	<	public double reduceKeysToDouble(ObjectToDouble<? super K> transformer,
2943	<	double basis,
2944	<	DoubleByDoubleToDouble reducer) {
2945	<	return fjp.invoke(ForkJoinTasks.reduceKeysToDouble
2946	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
2930	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2931	>	TreeNode<K,V> x) {
2932	>	x.red = true;
2933	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2934	>	if ((xp = x.parent) == null) {
2935	>	x.red = false;
2936	>	return x;
2937	>	}
2938	>	else if (!xp.red || (xpp = xp.parent) == null)
2939	>	return root;
2940	>	if (xp == (xppl = xpp.left)) {
2941	>	if ((xppr = xpp.right) != null && xppr.red) {
2942	>	xppr.red = false;
2943	>	xp.red = false;
2944	>	xpp.red = true;
2945	>	x = xpp;
2946	>	}
2947	>	else {
2948	>	if (x == xp.right) {
2949	>	root = rotateLeft(root, x = xp);
2950	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2951	>	}
2952	>	if (xp != null) {
2953	>	xp.red = false;
2954	>	if (xpp != null) {
2955	>	xpp.red = true;
2956	>	root = rotateRight(root, xpp);
2957	>	}
2958	>	}
2959	>	}
2960	>	}
2961	>	else {
2962	>	if (xppl != null && xppl.red) {
2963	>	xppl.red = false;
2964	>	xp.red = false;
2965	>	xpp.red = true;
2966	>	x = xpp;
2967	>	}
2968	>	else {
2969	>	if (x == xp.left) {
2970	>	root = rotateRight(root, x = xp);
2971	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2972	>	}
2973	>	if (xp != null) {
2974	>	xp.red = false;
2975	>	if (xpp != null) {
2976	>	xpp.red = true;
2977	>	root = rotateLeft(root, xpp);
2978	>	}
2979	>	}
2980	>	}
2981	>	}
2982	>	}
2983		}
2984
2985	<	/**
2986	<	* Returns the result of accumulating the given transformation
2987	<	* of all keys using the given reducer to combine values, and
2988	<	* the given basis as an identity value.
2989	<	*
2990	<	* @param transformer a function returning the transformation
2991	<	* for an element
2992	<	* @param basis the identity (initial default value) for the reduction
2993	<	* @param reducer a commutative associative combining function
2994	<	* @return the result of accumulating the given transformation
2995	<	* of all keys
2996	<	*/
2997	<	public long reduceKeysToLong(ObjectToLong<? super K> transformer,
2998	<	long basis,
2999	<	LongByLongToLong reducer) {
3000	<	return fjp.invoke(ForkJoinTasks.reduceKeysToLong
3001	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
2985	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
2986	>	TreeNode<K,V> x) {
2987	>	for (TreeNode<K,V> xp, xpl, xpr;;)  {
2988	>	if (x == null || x == root)
2989	>	return root;
2990	>	else if ((xp = x.parent) == null) {
2991	>	x.red = false;
2992	>	return x;
2993	>	}
2994	>	else if (x.red) {
2995	>	x.red = false;
2996	>	return root;
2997	>	}
2998	>	else if ((xpl = xp.left) == x) {
2999	>	if ((xpr = xp.right) != null && xpr.red) {
3000	>	xpr.red = false;
3001	>	xp.red = true;
3002	>	root = rotateLeft(root, xp);
3003	>	xpr = (xp = x.parent) == null ? null : xp.right;
3004	>	}
3005	>	if (xpr == null)
3006	>	x = xp;
3007	>	else {
3008	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
3009	>	if ((sr == null || !sr.red) &&
3010	>	(sl == null || !sl.red)) {
3011	>	xpr.red = true;
3012	>	x = xp;
3013	>	}
3014	>	else {
3015	>	if (sr == null || !sr.red) {
3016	>	if (sl != null)
3017	>	sl.red = false;
3018	>	xpr.red = true;
3019	>	root = rotateRight(root, xpr);
3020	>	xpr = (xp = x.parent) == null ?
3021	>	null : xp.right;
3022	>	}
3023	>	if (xpr != null) {
3024	>	xpr.red = (xp == null) ? false : xp.red;
3025	>	if ((sr = xpr.right) != null)
3026	>	sr.red = false;
3027	>	}
3028	>	if (xp != null) {
3029	>	xp.red = false;
3030	>	root = rotateLeft(root, xp);
3031	>	}
3032	>	x = root;
3033	>	}
3034	>	}
3035	>	}
3036	>	else { // symmetric
3037	>	if (xpl != null && xpl.red) {
3038	>	xpl.red = false;
3039	>	xp.red = true;
3040	>	root = rotateRight(root, xp);
3041	>	xpl = (xp = x.parent) == null ? null : xp.left;
3042	>	}
3043	>	if (xpl == null)
3044	>	x = xp;
3045	>	else {
3046	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3047	>	if ((sl == null || !sl.red) &&
3048	>	(sr == null || !sr.red)) {
3049	>	xpl.red = true;
3050	>	x = xp;
3051	>	}
3052	>	else {
3053	>	if (sl == null || !sl.red) {
3054	>	if (sr != null)
3055	>	sr.red = false;
3056	>	xpl.red = true;
3057	>	root = rotateLeft(root, xpl);
3058	>	xpl = (xp = x.parent) == null ?
3059	>	null : xp.left;
3060	>	}
3061	>	if (xpl != null) {
3062	>	xpl.red = (xp == null) ? false : xp.red;
3063	>	if ((sl = xpl.left) != null)
3064	>	sl.red = false;
3065	>	}
3066	>	if (xp != null) {
3067	>	xp.red = false;
3068	>	root = rotateRight(root, xp);
3069	>	}
3070	>	x = root;
3071	>	}
3072	>	}
3073	>	}
3074	>	}
3075		}
3076
3077		/**
3078	<	* Returns the result of accumulating the given transformation
3889	<	* of all keys using the given reducer to combine values, and
3890	<	* the given basis as an identity value.
3891	<	*
3892	<	* @param transformer a function returning the transformation
3893	<	* for an element
3894	<	* @param basis the identity (initial default value) for the reduction
3895	<	* @param reducer a commutative associative combining function
3896	<	* @return the result of accumulating the given transformation
3897	<	* of all keys
3078	>	* Recursive invariant check
3079		*/
3080	<	public int reduceKeysToInt(ObjectToInt<? super K> transformer,
3081	<	int basis,
3082	<	IntByIntToInt reducer) {
3083	<	return fjp.invoke(ForkJoinTasks.reduceKeysToInt
3084	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3080	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3081	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3082	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3083	>	if (tb != null && tb.next != t)
3084	>	return false;
3085	>	if (tn != null && tn.prev != t)
3086	>	return false;
3087	>	if (tp != null && t != tp.left && t != tp.right)
3088	>	return false;
3089	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3090	>	return false;
3091	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3092	>	return false;
3093	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3094	>	return false;
3095	>	if (tl != null && !checkInvariants(tl))
3096	>	return false;
3097	>	if (tr != null && !checkInvariants(tr))
3098	>	return false;
3099	>	return true;
3100		}
3101
3102	<	/**
3103	<	* Performs the given action for each value.
3104	<	*
3105	<	* @param action the action
3106	<	*/
3107	<	public void forEachValue(Action<V> action) {
3108	<	fjp.invoke(ForkJoinTasks.forEachValue
3109	<	(ConcurrentHashMapV8.this, action));
3102	>	private static final sun.misc.Unsafe U;
3103	>	private static final long LOCKSTATE;
3104	>	static {
3105	>	try {
3106	>	U = getUnsafe();
3107	>	Class<?> k = TreeBin.class;
3108	>	LOCKSTATE = U.objectFieldOffset
3109	>	(k.getDeclaredField("lockState"));
3110	>	} catch (Exception e) {
3111	>	throw new Error(e);
3112	>	}
3113		}
3114	+	}
3115
3116	<	/**
3117	<	* Performs the given action for each non-null transformation
3118	<	* of each value.
3119	<	*
3120	<	* @param transformer a function returning the transformation
3121	<	* for an element, or null of there is no transformation (in
3122	<	* which case the action is not applied).
3123	<	*/
3124	<	public <U> void forEachValue(Fun<? super V, ? extends U> transformer,
3125	<	Action<U> action) {
3126	<	fjp.invoke(ForkJoinTasks.forEachValue
3127	<	(ConcurrentHashMapV8.this, transformer, action));
3116	>	/* ----------------Table Traversal -------------- */
3117	>
3118	>	/**
3119	>	* Records the table, its length, and current traversal index for a
3120	>	* traverser that must process a region of a forwarded table before
3121	>	* proceeding with current table.
3122	>	*/
3123	>	static final class TableStack<K,V> {
3124	>	int length;
3125	>	int index;
3126	>	Node<K,V>[] tab;
3127	>	TableStack<K,V> next;
3128	>	}
3129	>
3130	>	/**
3131	>	* Encapsulates traversal for methods such as containsValue; also
3132	>	* serves as a base class for other iterators and spliterators.
3133	>	*
3134	>	* Method advance visits once each still-valid node that was
3135	>	* reachable upon iterator construction. It might miss some that
3136	>	* were added to a bin after the bin was visited, which is OK wrt
3137	>	* consistency guarantees. Maintaining this property in the face
3138	>	* of possible ongoing resizes requires a fair amount of
3139	>	* bookkeeping state that is difficult to optimize away amidst
3140	>	* volatile accesses.  Even so, traversal maintains reasonable
3141	>	* throughput.
3142	>	*
3143	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3144	>	* However, if the table has been resized, then all future steps
3145	>	* must traverse both the bin at the current index as well as at
3146	>	* (index + baseSize); and so on for further resizings. To
3147	>	* paranoically cope with potential sharing by users of iterators
3148	>	* across threads, iteration terminates if a bounds checks fails
3149	>	* for a table read.
3150	>	*/
3151	>	static class Traverser<K,V> {
3152	>	Node<K,V>[] tab;        // current table; updated if resized
3153	>	Node<K,V> next;         // the next entry to use
3154	>	TableStack<K,V> stack, spare; // to save/restore on ForwardingNodes
3155	>	int index;              // index of bin to use next
3156	>	int baseIndex;          // current index of initial table
3157	>	int baseLimit;          // index bound for initial table
3158	>	final int baseSize;     // initial table size
3159	>
3160	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3161	>	this.tab = tab;
3162	>	this.baseSize = size;
3163	>	this.baseIndex = this.index = index;
3164	>	this.baseLimit = limit;
3165	>	this.next = null;
3166		}
3167
3168		/**
3169	<	* Returns a non-null result from applying the given search
3170	<	* function on each value, or null if none.  Upon success,
3171	<	* further element processing is suppressed and the results of
3172	<	* any other parallel invocations of the search function are
3173	<	* ignored.
3174	<	*
3175	<	* @param searchFunction a function returning a non-null
3176	<	* result on success, else null
3177	<	* @return a non-null result from applying the given search
3178	<	* function on each value, or null if none
3179	<	*
3180	<	*/
3181	<	public <U> U searchValues(Fun<? super V, ? extends U> searchFunction) {
3182	<	return fjp.invoke(ForkJoinTasks.searchValues
3183	<	(ConcurrentHashMapV8.this, searchFunction));
3169	>	* Advances if possible, returning next valid node, or null if none.
3170	>	*/
3171	>	final Node<K,V> advance() {
3172	>	Node<K,V> e;
3173	>	if ((e = next) != null)
3174	>	e = e.next;
3175	>	for (;;) {
3176	>	Node<K,V>[] t; int i, n;  // must use locals in checks
3177	>	if (e != null)
3178	>	return next = e;
3179	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3180	>	(n = t.length) <= (i = index) || i < 0)
3181	>	return next = null;
3182	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
3183	>	if (e instanceof ForwardingNode) {
3184	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3185	>	e = null;
3186	>	pushState(t, i, n);
3187	>	continue;
3188	>	}
3189	>	else if (e instanceof TreeBin)
3190	>	e = ((TreeBin<K,V>)e).first;
3191	>	else
3192	>	e = null;
3193	>	}
3194	>	if (stack != null)
3195	>	recoverState(n);
3196	>	else if ((index = i + baseSize) >= n)
3197	>	index = ++baseIndex; // visit upper slots if present
3198	>	}
3199		}
3200
3201		/**
3202	<	* Returns the result of accumulating all values using the
3950	<	* given reducer to combine values, or null if none.
3951	<	*
3952	<	* @param reducer a commutative associative combining function
3953	<	* @return  the result of accumulating all values
3202	>	* Saves traversal state upon encountering a forwarding node.
3203		*/
3204	<	public V reduceValues(BiFun<? super V, ? super V, ? extends V> reducer) {
3205	<	return fjp.invoke(ForkJoinTasks.reduceValues
3206	<	(ConcurrentHashMapV8.this, reducer));
3204	>	private void pushState(Node<K,V>[] t, int i, int n) {
3205	>	TableStack<K,V> s = spare;  // reuse if possible
3206	>	if (s != null)
3207	>	spare = s.next;
3208	>	else
3209	>	s = new TableStack<K,V>();
3210	>	s.tab = t;
3211	>	s.length = n;
3212	>	s.index = i;
3213	>	s.next = stack;
3214	>	stack = s;
3215		}
3216
3217		/**
3218	<	* Returns the result of accumulating the given transformation
3962	<	* of all values using the given reducer to combine values, or
3963	<	* null if none.
3218	>	* Possibly pops traversal state.
3219		*
3220	<	* @param transformer a function returning the transformation
3966	<	* for an element, or null of there is no transformation (in
3967	<	* which case it is not combined).
3968	<	* @param reducer a commutative associative combining function
3969	<	* @return the result of accumulating the given transformation
3970	<	* of all values
3220	>	* @param n length of current table
3221		*/
3222	<	public <U> U reduceValues(Fun<? super V, ? extends U> transformer,
3223	<	BiFun<? super U, ? super U, ? extends U> reducer) {
3224	<	return fjp.invoke(ForkJoinTasks.reduceValues
3225	<	(ConcurrentHashMapV8.this, transformer, reducer));
3222	>	private void recoverState(int n) {
3223	>	TableStack<K,V> s; int len;
3224	>	while ((s = stack) != null && (index += (len = s.length)) >= n) {
3225	>	n = len;
3226	>	index = s.index;
3227	>	tab = s.tab;
3228	>	s.tab = null;
3229	>	TableStack<K,V> next = s.next;
3230	>	s.next = spare; // save for reuse
3231	>	stack = next;
3232	>	spare = s;
3233	>	}
3234	>	if (s == null && (index += baseSize) >= n)
3235	>	index = ++baseIndex;
3236		}
3237	+	}
3238
3239	<	/**
3240	<	* Returns the result of accumulating the given transformation
3241	<	* of all values using the given reducer to combine values,
3242	<	* and the given basis as an identity value.
3243	<	*
3244	<	* @param transformer a function returning the transformation
3245	<	* for an element
3246	<	* @param basis the identity (initial default value) for the reduction
3247	<	* @param reducer a commutative associative combining function
3248	<	* @return the result of accumulating the given transformation
3249	<	* of all values
3250	<	*/
3990	<	public double reduceValuesToDouble(ObjectToDouble<? super V> transformer,
3991	<	double basis,
3992	<	DoubleByDoubleToDouble reducer) {
3993	<	return fjp.invoke(ForkJoinTasks.reduceValuesToDouble
3994	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3239	>	/**
3240	>	* Base of key, value, and entry Iterators. Adds fields to
3241	>	* Traverser to support iterator.remove.
3242	>	*/
3243	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3244	>	final ConcurrentHashMapV8<K,V> map;
3245	>	Node<K,V> lastReturned;
3246	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3247	>	ConcurrentHashMapV8<K,V> map) {
3248	>	super(tab, size, index, limit);
3249	>	this.map = map;
3250	>	advance();
3251		}
3252
3253	<	/**
3254	<	* Returns the result of accumulating the given transformation
3255	<	* of all values using the given reducer to combine values,
3256	<	* and the given basis as an identity value.
3257	<	*
3258	<	* @param transformer a function returning the transformation
3259	<	* for an element
3260	<	* @param basis the identity (initial default value) for the reduction
3261	<	* @param reducer a commutative associative combining function
4006	<	* @return the result of accumulating the given transformation
4007	<	* of all values
4008	<	*/
4009	<	public long reduceValuesToLong(ObjectToLong<? super V> transformer,
4010	<	long basis,
4011	<	LongByLongToLong reducer) {
4012	<	return fjp.invoke(ForkJoinTasks.reduceValuesToLong
4013	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3253	>	public final boolean hasNext() { return next != null; }
3254	>	public final boolean hasMoreElements() { return next != null; }
3255	>
3256	>	public final void remove() {
3257	>	Node<K,V> p;
3258	>	if ((p = lastReturned) == null)
3259	>	throw new IllegalStateException();
3260	>	lastReturned = null;
3261	>	map.replaceNode(p.key, null, null);
3262		}
3263	+	}
3264
3265	<	/**
3266	<	* Returns the result of accumulating the given transformation
3267	<	* of all values using the given reducer to combine values,
3268	<	* and the given basis as an identity value.
3269	<	*
4021	<	* @param transformer a function returning the transformation
4022	<	* for an element
4023	<	* @param basis the identity (initial default value) for the reduction
4024	<	* @param reducer a commutative associative combining function
4025	<	* @return the result of accumulating the given transformation
4026	<	* of all values
4027	<	*/
4028	<	public int reduceValuesToInt(ObjectToInt<? super V> transformer,
4029	<	int basis,
4030	<	IntByIntToInt reducer) {
4031	<	return fjp.invoke(ForkJoinTasks.reduceValuesToInt
4032	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3265	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3266	>	implements Iterator<K>, Enumeration<K> {
3267	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3268	>	ConcurrentHashMapV8<K,V> map) {
3269	>	super(tab, index, size, limit, map);
3270		}
3271
3272	<	/**
3273	<	* Performs the given action for each entry.
3274	<	*
3275	<	* @param action the action
3276	<	*/
3277	<	public void forEachEntry(Action<Map.Entry<K,V>> action) {
3278	<	fjp.invoke(ForkJoinTasks.forEachEntry
3279	<	(ConcurrentHashMapV8.this, action));
3272	>	public final K next() {
3273	>	Node<K,V> p;
3274	>	if ((p = next) == null)
3275	>	throw new NoSuchElementException();
3276	>	K k = p.key;
3277	>	lastReturned = p;
3278	>	advance();
3279	>	return k;
3280		}
3281
3282	<	/**
3283	<	* Performs the given action for each non-null transformation
3284	<	* of each entry.
3285	<	*
3286	<	* @param transformer a function returning the transformation
3287	<	* for an element, or null of there is no transformation (in
3288	<	* which case the action is not applied).
3289	<	* @param action the action
4053	<	*/
4054	<	public <U> void forEachEntry(Fun<Map.Entry<K,V>, ? extends U> transformer,
4055	<	Action<U> action) {
4056	<	fjp.invoke(ForkJoinTasks.forEachEntry
4057	<	(ConcurrentHashMapV8.this, transformer, action));
3282	>	public final K nextElement() { return next(); }
3283	>	}
3284	>
3285	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3286	>	implements Iterator<V>, Enumeration<V> {
3287	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3288	>	ConcurrentHashMapV8<K,V> map) {
3289	>	super(tab, index, size, limit, map);
3290		}
3291
3292	<	/**
3293	<	* Returns a non-null result from applying the given search
3294	<	* function on each entry, or null if none.  Upon success,
3295	<	* further element processing is suppressed and the results of
3296	<	* any other parallel invocations of the search function are
3297	<	* ignored.
3298	<	*
3299	<	* @param searchFunction a function returning a non-null
4068	<	* result on success, else null
4069	<	* @return a non-null result from applying the given search
4070	<	* function on each entry, or null if none
4071	<	*/
4072	<	public <U> U searchEntries(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4073	<	return fjp.invoke(ForkJoinTasks.searchEntries
4074	<	(ConcurrentHashMapV8.this, searchFunction));
3292	>	public final V next() {
3293	>	Node<K,V> p;
3294	>	if ((p = next) == null)
3295	>	throw new NoSuchElementException();
3296	>	V v = p.val;
3297	>	lastReturned = p;
3298	>	advance();
3299	>	return v;
3300		}
3301
3302	<	/**
3303	<	* Returns the result of accumulating all entries using the
3304	<	* given reducer to combine values, or null if none.
3305	<	*
3306	<	* @param reducer a commutative associative combining function
3307	<	* @return the result of accumulating all entries
3308	<	*/
3309	<	public Map.Entry<K,V> reduceEntries(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4085	<	return fjp.invoke(ForkJoinTasks.reduceEntries
4086	<	(ConcurrentHashMapV8.this, reducer));
3302	>	public final V nextElement() { return next(); }
3303	>	}
3304	>
3305	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3306	>	implements Iterator<Map.Entry<K,V>> {
3307	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3308	>	ConcurrentHashMapV8<K,V> map) {
3309	>	super(tab, index, size, limit, map);
3310		}
3311
3312	<	/**
3313	<	* Returns the result of accumulating the given transformation
3314	<	* of all entries using the given reducer to combine values,
3315	<	* or null if none.
3316	<	*
3317	<	* @param transformer a function returning the transformation
3318	<	* for an element, or null of there is no transformation (in
3319	<	* which case it is not combined).
3320	<	* @param reducer a commutative associative combining function
4098	<	* @return the result of accumulating the given transformation
4099	<	* of all entries
4100	<	*/
4101	<	public <U> U reduceEntries(Fun<Map.Entry<K,V>, ? extends U> transformer,
4102	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4103	<	return fjp.invoke(ForkJoinTasks.reduceEntries
4104	<	(ConcurrentHashMapV8.this, transformer, reducer));
3312	>	public final Map.Entry<K,V> next() {
3313	>	Node<K,V> p;
3314	>	if ((p = next) == null)
3315	>	throw new NoSuchElementException();
3316	>	K k = p.key;
3317	>	V v = p.val;
3318	>	lastReturned = p;
3319	>	advance();
3320	>	return new MapEntry<K,V>(k, v, map);
3321		}
3322	+	}
3323
3324	<	/**
3325	<	* Returns the result of accumulating the given transformation
3326	<	* of all entries using the given reducer to combine values,
3327	<	* and the given basis as an identity value.
3328	<	*
3329	<	* @param transformer a function returning the transformation
3330	<	* for an element
3331	<	* @param basis the identity (initial default value) for the reduction
3332	<	* @param reducer a commutative associative combining function
3333	<	* @return the result of accumulating the given transformation
3334	<	* of all entries
4118	<	*/
4119	<	public double reduceEntriesToDouble(ObjectToDouble<Map.Entry<K,V>> transformer,
4120	<	double basis,
4121	<	DoubleByDoubleToDouble reducer) {
4122	<	return fjp.invoke(ForkJoinTasks.reduceEntriesToDouble
4123	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3324	>	/**
3325	>	* Exported Entry for EntryIterator
3326	>	*/
3327	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3328	>	final K key; // non-null
3329	>	V val;       // non-null
3330	>	final ConcurrentHashMapV8<K,V> map;
3331	>	MapEntry(K key, V val, ConcurrentHashMapV8<K,V> map) {
3332	>	this.key = key;
3333	>	this.val = val;
3334	>	this.map = map;
3335		}
3336	+	public K getKey()        { return key; }
3337	+	public V getValue()      { return val; }
3338	+	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3339	+	public String toString() { return key + "=" + val; }
3340
3341	<	/**
3342	<	* Returns the result of accumulating the given transformation
3343	<	* of all entries using the given reducer to combine values,
3344	<	* and the given basis as an identity value.
3345	<	*
3346	<	* @param transformer a function returning the transformation
3347	<	* for an element
4133	<	* @param basis the identity (initial default value) for the reduction
4134	<	* @param reducer a commutative associative combining function
4135	<	* @return  the result of accumulating the given transformation
4136	<	* of all entries
4137	<	*/
4138	<	public long reduceEntriesToLong(ObjectToLong<Map.Entry<K,V>> transformer,
4139	<	long basis,
4140	<	LongByLongToLong reducer) {
4141	<	return fjp.invoke(ForkJoinTasks.reduceEntriesToLong
4142	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3341	>	public boolean equals(Object o) {
3342	>	Object k, v; Map.Entry<?,?> e;
3343	>	return ((o instanceof Map.Entry) &&
3344	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
3345	>	(v = e.getValue()) != null &&
3346	>	(k == key || k.equals(key)) &&
3347	>	(v == val || v.equals(val)));
3348		}
3349
3350		/**
3351	<	* Returns the result of accumulating the given transformation
3352	<	* of all entries using the given reducer to combine values,
3353	<	* and the given basis as an identity value.
3354	<	*
3355	<	* @param transformer a function returning the transformation
3356	<	* for an element
4152	<	* @param basis the identity (initial default value) for the reduction
4153	<	* @param reducer a commutative associative combining function
4154	<	* @return the result of accumulating the given transformation
4155	<	* of all entries
3351	>	* Sets our entry's value and writes through to the map. The
3352	>	* value to return is somewhat arbitrary here. Since we do not
3353	>	* necessarily track asynchronous changes, the most recent
3354	>	* "previous" value could be different from what we return (or
3355	>	* could even have been removed, in which case the put will
3356	>	* re-establish). We do not and cannot guarantee more.
3357		*/
3358	<	public int reduceEntriesToInt(ObjectToInt<Map.Entry<K,V>> transformer,
3359	<	int basis,
3360	<	IntByIntToInt reducer) {
3361	<	return fjp.invoke(ForkJoinTasks.reduceEntriesToInt
3362	<	(ConcurrentHashMapV8.this, transformer, basis, reducer));
3358	>	public V setValue(V value) {
3359	>	if (value == null) throw new NullPointerException();
3360	>	V v = val;
3361	>	val = value;
3362	>	map.put(key, value);
3363	>	return v;
3364		}
3365		}
3366
3367	<	// ---------------------------------------------------------------------
3367	>	static final class KeySpliterator<K,V> extends Traverser<K,V>
3368	>	implements ConcurrentHashMapSpliterator<K> {
3369	>	long est;               // size estimate
3370	>	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3371	>	long est) {
3372	>	super(tab, size, index, limit);
3373	>	this.est = est;
3374	>	}
3375	>
3376	>	public ConcurrentHashMapSpliterator<K> trySplit() {
3377	>	int i, f, h;
3378	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3379	>	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3380	>	f, est >>>= 1);
3381	>	}
3382
3383	<	/**
3384	<	* Predefined tasks for performing bulk parallel operations on
3385	<	* ConcurrentHashMaps. These tasks follow the forms and rules used
3386	<	* in class {@link Parallel}. Each method has the same name, but
3387	<	* returns a task rather than invoking it. These methods may be
4172	<	* useful in custom applications such as submitting a task without
4173	<	* waiting for completion, or combining with other tasks.
4174	<	*/
4175	<	public static class ForkJoinTasks {
4176	<	private ForkJoinTasks() {}
3383	>	public void forEachRemaining(Action<? super K> action) {
3384	>	if (action == null) throw new NullPointerException();
3385	>	for (Node<K,V> p; (p = advance()) != null;)
3386	>	action.apply(p.key);
3387	>	}
3388
3389	<	/**
4179	<	* Returns a task that when invoked, performs the given
4180	<	* action for each (key, value)
4181	<	*
4182	<	* @param map the map
4183	<	* @param action the action
4184	<	* @return the task
4185	<	*/
4186	<	public static <K,V> ForkJoinTask<Void> forEach
4187	<	(ConcurrentHashMapV8<K,V> map,
4188	<	BiAction<K,V> action) {
3389	>	public boolean tryAdvance(Action<? super K> action) {
3390		if (action == null) throw new NullPointerException();
3391	<	return new ForEachMappingTask<K,V>(map, null, -1, action);
3391	>	Node<K,V> p;
3392	>	if ((p = advance()) == null)
3393	>	return false;
3394	>	action.apply(p.key);
3395	>	return true;
3396		}
3397
3398	<	/**
3399	<	* Returns a task that when invoked, performs the given
3400	<	* action for each non-null transformation of each (key, value)
3401	<	*
3402	<	* @param map the map
3403	<	* @param transformer a function returning the transformation
3404	<	* for an element, or null of there is no transformation (in
3405	<	* which case the action is not applied).
3406	<	* @param action the action
3407	<	* @return the task
3408	<	*/
4204	<	public static <K,V,U> ForkJoinTask<Void> forEach
4205	<	(ConcurrentHashMapV8<K,V> map,
4206	<	BiFun<? super K, ? super V, ? extends U> transformer,
4207	<	Action<U> action) {
4208	<	if (transformer == null || action == null)
4209	<	throw new NullPointerException();
4210	<	return new ForEachTransformedMappingTask<K,V,U>
4211	<	(map, null, -1, transformer, action);
3398	>	public long estimateSize() { return est; }
3399	>
3400	>	}
3401	>
3402	>	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3403	>	implements ConcurrentHashMapSpliterator<V> {
3404	>	long est;               // size estimate
3405	>	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3406	>	long est) {
3407	>	super(tab, size, index, limit);
3408	>	this.est = est;
3409		}
3410
3411	<	/**
3412	<	* Returns a task that when invoked, returns a non-null result
3413	<	* from applying the given search function on each (key,
3414	<	* value), or null if none. Upon success, further element
3415	<	* processing is suppressed and the results of any other
4219	<	* parallel invocations of the search function are ignored.
4220	<	*
4221	<	* @param map the map
4222	<	* @param searchFunction a function returning a non-null
4223	<	* result on success, else null
4224	<	* @return the task
4225	<	*/
4226	<	public static <K,V,U> ForkJoinTask<U> search
4227	<	(ConcurrentHashMapV8<K,V> map,
4228	<	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4229	<	if (searchFunction == null) throw new NullPointerException();
4230	<	return new SearchMappingsTask<K,V,U>
4231	<	(map, null, -1, searchFunction,
4232	<	new AtomicReference<U>());
3411	>	public ConcurrentHashMapSpliterator<V> trySplit() {
3412	>	int i, f, h;
3413	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3414	>	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3415	>	f, est >>>= 1);
3416		}
3417
3418	<	/**
3419	<	* Returns a task that when invoked, returns the result of
3420	<	* accumulating the given transformation of all (key, value) pairs
3421	<	* using the given reducer to combine values, or null if none.
4239	<	*
4240	<	* @param map the map
4241	<	* @param transformer a function returning the transformation
4242	<	* for an element, or null of there is no transformation (in
4243	<	* which case it is not combined).
4244	<	* @param reducer a commutative associative combining function
4245	<	* @return the task
4246	<	*/
4247	<	public static <K,V,U> ForkJoinTask<U> reduce
4248	<	(ConcurrentHashMapV8<K,V> map,
4249	<	BiFun<? super K, ? super V, ? extends U> transformer,
4250	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4251	<	if (transformer == null || reducer == null)
4252	<	throw new NullPointerException();
4253	<	return new MapReduceMappingsTask<K,V,U>
4254	<	(map, null, -1, null, transformer, reducer);
3418	>	public void forEachRemaining(Action<? super V> action) {
3419	>	if (action == null) throw new NullPointerException();
3420	>	for (Node<K,V> p; (p = advance()) != null;)
3421	>	action.apply(p.val);
3422		}
3423
3424	<	/**
3425	<	* Returns a task that when invoked, returns the result of
3426	<	* accumulating the given transformation of all (key, value) pairs
3427	<	* using the given reducer to combine values, and the given
3428	<	* basis as an identity value.
3429	<	*
3430	<	* @param map the map
4264	<	* @param transformer a function returning the transformation
4265	<	* for an element
4266	<	* @param basis the identity (initial default value) for the reduction
4267	<	* @param reducer a commutative associative combining function
4268	<	* @return the task
4269	<	*/
4270	<	public static <K,V> ForkJoinTask<Double> reduceToDouble
4271	<	(ConcurrentHashMapV8<K,V> map,
4272	<	ObjectByObjectToDouble<? super K, ? super V> transformer,
4273	<	double basis,
4274	<	DoubleByDoubleToDouble reducer) {
4275	<	if (transformer == null || reducer == null)
4276	<	throw new NullPointerException();
4277	<	return new MapReduceMappingsToDoubleTask<K,V>
4278	<	(map, null, -1, null, transformer, basis, reducer);
3424	>	public boolean tryAdvance(Action<? super V> action) {
3425	>	if (action == null) throw new NullPointerException();
3426	>	Node<K,V> p;
3427	>	if ((p = advance()) == null)
3428	>	return false;
3429	>	action.apply(p.val);
3430	>	return true;
3431		}
3432
3433	<	/**
3434	<	* Returns a task that when invoked, returns the result of
3435	<	* accumulating the given transformation of all (key, value) pairs
3436	<	* using the given reducer to combine values, and the given
3437	<	* basis as an identity value.
3438	<	*
3439	<	* @param map the map
3440	<	* @param transformer a function returning the transformation
3441	<	* for an element
3442	<	* @param basis the identity (initial default value) for the reduction
3443	<	* @param reducer a commutative associative combining function
3444	<	* @return the task
3445	<	*/
4294	<	public static <K,V> ForkJoinTask<Long> reduceToLong
4295	<	(ConcurrentHashMapV8<K,V> map,
4296	<	ObjectByObjectToLong<? super K, ? super V> transformer,
4297	<	long basis,
4298	<	LongByLongToLong reducer) {
4299	<	if (transformer == null || reducer == null)
4300	<	throw new NullPointerException();
4301	<	return new MapReduceMappingsToLongTask<K,V>
4302	<	(map, null, -1, null, transformer, basis, reducer);
3433	>	public long estimateSize() { return est; }
3434	>
3435	>	}
3436	>
3437	>	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3438	>	implements ConcurrentHashMapSpliterator<Map.Entry<K,V>> {
3439	>	final ConcurrentHashMapV8<K,V> map; // To export MapEntry
3440	>	long est;               // size estimate
3441	>	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3442	>	long est, ConcurrentHashMapV8<K,V> map) {
3443	>	super(tab, size, index, limit);
3444	>	this.map = map;
3445	>	this.est = est;
3446		}
3447
3448	<	/**
3449	<	* Returns a task that when invoked, returns the result of
3450	<	* accumulating the given transformation of all (key, value) pairs
3451	<	* using the given reducer to combine values, and the given
3452	<	* basis as an identity value.
4310	<	*
4311	<	* @param transformer a function returning the transformation
4312	<	* for an element
4313	<	* @param basis the identity (initial default value) for the reduction
4314	<	* @param reducer a commutative associative combining function
4315	<	* @return the task
4316	<	*/
4317	<	public static <K,V> ForkJoinTask<Integer> reduceToInt
4318	<	(ConcurrentHashMapV8<K,V> map,
4319	<	ObjectByObjectToInt<? super K, ? super V> transformer,
4320	<	int basis,
4321	<	IntByIntToInt reducer) {
4322	<	if (transformer == null || reducer == null)
4323	<	throw new NullPointerException();
4324	<	return new MapReduceMappingsToIntTask<K,V>
4325	<	(map, null, -1, null, transformer, basis, reducer);
3448	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> trySplit() {
3449	>	int i, f, h;
3450	>	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3451	>	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3452	>	f, est >>>= 1, map);
3453		}
3454
3455	<	/**
4329	<	* Returns a task that when invoked, performs the given action
4330	<	* for each key.
4331	<	*
4332	<	* @param map the map
4333	<	* @param action the action
4334	<	* @return the task
4335	<	*/
4336	<	public static <K,V> ForkJoinTask<Void> forEachKey
4337	<	(ConcurrentHashMapV8<K,V> map,
4338	<	Action<K> action) {
3455	>	public void forEachRemaining(Action<? super Map.Entry<K,V>> action) {
3456		if (action == null) throw new NullPointerException();
3457	<	return new ForEachKeyTask<K,V>(map, null, -1, action);
3457	>	for (Node<K,V> p; (p = advance()) != null; )
3458	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3459		}
3460
3461	<	/**
3462	<	* Returns a task that when invoked, performs the given action
3463	<	* for each non-null transformation of each key.
3464	<	*
3465	<	* @param map the map
3466	<	* @param transformer a function returning the transformation
3467	<	* for an element, or null of there is no transformation (in
4350	<	* which case the action is not applied).
4351	<	* @param action the action
4352	<	* @return the task
4353	<	*/
4354	<	public static <K,V,U> ForkJoinTask<Void> forEachKey
4355	<	(ConcurrentHashMapV8<K,V> map,
4356	<	Fun<? super K, ? extends U> transformer,
4357	<	Action<U> action) {
4358	<	if (transformer == null || action == null)
4359	<	throw new NullPointerException();
4360	<	return new ForEachTransformedKeyTask<K,V,U>
4361	<	(map, null, -1, transformer, action);
3461	>	public boolean tryAdvance(Action<? super Map.Entry<K,V>> action) {
3462	>	if (action == null) throw new NullPointerException();
3463	>	Node<K,V> p;
3464	>	if ((p = advance()) == null)
3465	>	return false;
3466	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3467	>	return true;
3468		}
3469
3470	+	public long estimateSize() { return est; }
3471	+
3472	+	}
3473	+
3474	+	// Parallel bulk operations
3475	+
3476	+	/**
3477	+	* Computes initial batch value for bulk tasks. The returned value
3478	+	* is approximately exp2 of the number of times (minus one) to
3479	+	* split task by two before executing leaf action. This value is
3480	+	* faster to compute and more convenient to use as a guide to
3481	+	* splitting than is the depth, since it is used while dividing by
3482	+	* two anyway.
3483	+	*/
3484	+	final int batchFor(long b) {
3485	+	long n;
3486	+	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3487	+	return 0;
3488	+	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3489	+	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3490	+	}
3491	+
3492	+	/**
3493	+	* Performs the given action for each (key, value).
3494	+	*
3495	+	* @param parallelismThreshold the (estimated) number of elements
3496	+	* needed for this operation to be executed in parallel
3497	+	* @param action the action
3498	+	* @since 1.8
3499	+	*/
3500	+	public void forEach(long parallelismThreshold,
3501	+	BiAction<? super K,? super V> action) {
3502	+	if (action == null) throw new NullPointerException();
3503	+	new ForEachMappingTask<K,V>
3504	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3505	+	action).invoke();
3506	+	}
3507	+
3508	+	/**
3509	+	* Performs the given action for each non-null transformation
3510	+	* of each (key, value).
3511	+	*
3512	+	* @param parallelismThreshold the (estimated) number of elements
3513	+	* needed for this operation to be executed in parallel
3514	+	* @param transformer a function returning the transformation
3515	+	* for an element, or null if there is no transformation (in
3516	+	* which case the action is not applied)
3517	+	* @param action the action
3518	+	* @since 1.8
3519	+	*/
3520	+	public <U> void forEach(long parallelismThreshold,
3521	+	BiFun<? super K, ? super V, ? extends U> transformer,
3522	+	Action<? super U> action) {
3523	+	if (transformer == null || action == null)
3524	+	throw new NullPointerException();
3525	+	new ForEachTransformedMappingTask<K,V,U>
3526	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3527	+	transformer, action).invoke();
3528	+	}
3529	+
3530	+	/**
3531	+	* Returns a non-null result from applying the given search
3532	+	* function on each (key, value), or null if none.  Upon
3533	+	* success, further element processing is suppressed and the
3534	+	* results of any other parallel invocations of the search
3535	+	* function are ignored.
3536	+	*
3537	+	* @param parallelismThreshold the (estimated) number of elements
3538	+	* needed for this operation to be executed in parallel
3539	+	* @param searchFunction a function returning a non-null
3540	+	* result on success, else null
3541	+	* @return a non-null result from applying the given search
3542	+	* function on each (key, value), or null if none
3543	+	* @since 1.8
3544	+	*/
3545	+	public <U> U search(long parallelismThreshold,
3546	+	BiFun<? super K, ? super V, ? extends U> searchFunction) {
3547	+	if (searchFunction == null) throw new NullPointerException();
3548	+	return new SearchMappingsTask<K,V,U>
3549	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3550	+	searchFunction, new AtomicReference<U>()).invoke();
3551	+	}
3552	+
3553	+	/**
3554	+	* Returns the result of accumulating the given transformation
3555	+	* of all (key, value) pairs using the given reducer to
3556	+	* combine values, or null if none.
3557	+	*
3558	+	* @param parallelismThreshold the (estimated) number of elements
3559	+	* needed for this operation to be executed in parallel
3560	+	* @param transformer a function returning the transformation
3561	+	* for an element, or null if there is no transformation (in
3562	+	* which case it is not combined)
3563	+	* @param reducer a commutative associative combining function
3564	+	* @return the result of accumulating the given transformation
3565	+	* of all (key, value) pairs
3566	+	* @since 1.8
3567	+	*/
3568	+	public <U> U reduce(long parallelismThreshold,
3569	+	BiFun<? super K, ? super V, ? extends U> transformer,
3570	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3571	+	if (transformer == null || reducer == null)
3572	+	throw new NullPointerException();
3573	+	return new MapReduceMappingsTask<K,V,U>
3574	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3575	+	null, transformer, reducer).invoke();
3576	+	}
3577	+
3578	+	/**
3579	+	* Returns the result of accumulating the given transformation
3580	+	* of all (key, value) pairs using the given reducer to
3581	+	* combine values, and the given basis as an identity value.
3582	+	*
3583	+	* @param parallelismThreshold the (estimated) number of elements
3584	+	* needed for this operation to be executed in parallel
3585	+	* @param transformer a function returning the transformation
3586	+	* for an element
3587	+	* @param basis the identity (initial default value) for the reduction
3588	+	* @param reducer a commutative associative combining function
3589	+	* @return the result of accumulating the given transformation
3590	+	* of all (key, value) pairs
3591	+	* @since 1.8
3592	+	*/
3593	+	public double reduceToDouble(long parallelismThreshold,
3594	+	ObjectByObjectToDouble<? super K, ? super V> transformer,
3595	+	double basis,
3596	+	DoubleByDoubleToDouble reducer) {
3597	+	if (transformer == null || reducer == null)
3598	+	throw new NullPointerException();
3599	+	return new MapReduceMappingsToDoubleTask<K,V>
3600	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3601	+	null, transformer, basis, reducer).invoke();
3602	+	}
3603	+
3604	+	/**
3605	+	* Returns the result of accumulating the given transformation
3606	+	* of all (key, value) pairs using the given reducer to
3607	+	* combine values, and the given basis as an identity value.
3608	+	*
3609	+	* @param parallelismThreshold the (estimated) number of elements
3610	+	* needed for this operation to be executed in parallel
3611	+	* @param transformer a function returning the transformation
3612	+	* for an element
3613	+	* @param basis the identity (initial default value) for the reduction
3614	+	* @param reducer a commutative associative combining function
3615	+	* @return the result of accumulating the given transformation
3616	+	* of all (key, value) pairs
3617	+	* @since 1.8
3618	+	*/
3619	+	public long reduceToLong(long parallelismThreshold,
3620	+	ObjectByObjectToLong<? super K, ? super V> transformer,
3621	+	long basis,
3622	+	LongByLongToLong reducer) {
3623	+	if (transformer == null || reducer == null)
3624	+	throw new NullPointerException();
3625	+	return new MapReduceMappingsToLongTask<K,V>
3626	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3627	+	null, transformer, basis, reducer).invoke();
3628	+	}
3629	+
3630	+	/**
3631	+	* Returns the result of accumulating the given transformation
3632	+	* of all (key, value) pairs using the given reducer to
3633	+	* combine values, and the given basis as an identity value.
3634	+	*
3635	+	* @param parallelismThreshold the (estimated) number of elements
3636	+	* needed for this operation to be executed in parallel
3637	+	* @param transformer a function returning the transformation
3638	+	* for an element
3639	+	* @param basis the identity (initial default value) for the reduction
3640	+	* @param reducer a commutative associative combining function
3641	+	* @return the result of accumulating the given transformation
3642	+	* of all (key, value) pairs
3643	+	* @since 1.8
3644	+	*/
3645	+	public int reduceToInt(long parallelismThreshold,
3646	+	ObjectByObjectToInt<? super K, ? super V> transformer,
3647	+	int basis,
3648	+	IntByIntToInt reducer) {
3649	+	if (transformer == null || reducer == null)
3650	+	throw new NullPointerException();
3651	+	return new MapReduceMappingsToIntTask<K,V>
3652	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3653	+	null, transformer, basis, reducer).invoke();
3654	+	}
3655	+
3656	+	/**
3657	+	* Performs the given action for each key.
3658	+	*
3659	+	* @param parallelismThreshold the (estimated) number of elements
3660	+	* needed for this operation to be executed in parallel
3661	+	* @param action the action
3662	+	* @since 1.8
3663	+	*/
3664	+	public void forEachKey(long parallelismThreshold,
3665	+	Action<? super K> action) {
3666	+	if (action == null) throw new NullPointerException();
3667	+	new ForEachKeyTask<K,V>
3668	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3669	+	action).invoke();
3670	+	}
3671	+
3672	+	/**
3673	+	* Performs the given action for each non-null transformation
3674	+	* of each key.
3675	+	*
3676	+	* @param parallelismThreshold the (estimated) number of elements
3677	+	* needed for this operation to be executed in parallel
3678	+	* @param transformer a function returning the transformation
3679	+	* for an element, or null if there is no transformation (in
3680	+	* which case the action is not applied)
3681	+	* @param action the action
3682	+	* @since 1.8
3683	+	*/
3684	+	public <U> void forEachKey(long parallelismThreshold,
3685	+	Fun<? super K, ? extends U> transformer,
3686	+	Action<? super U> action) {
3687	+	if (transformer == null || action == null)
3688	+	throw new NullPointerException();
3689	+	new ForEachTransformedKeyTask<K,V,U>
3690	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3691	+	transformer, action).invoke();
3692	+	}
3693	+
3694	+	/**
3695	+	* Returns a non-null result from applying the given search
3696	+	* function on each key, or null if none. Upon success,
3697	+	* further element processing is suppressed and the results of
3698	+	* any other parallel invocations of the search function are
3699	+	* ignored.
3700	+	*
3701	+	* @param parallelismThreshold the (estimated) number of elements
3702	+	* needed for this operation to be executed in parallel
3703	+	* @param searchFunction a function returning a non-null
3704	+	* result on success, else null
3705	+	* @return a non-null result from applying the given search
3706	+	* function on each key, or null if none
3707	+	* @since 1.8
3708	+	*/
3709	+	public <U> U searchKeys(long parallelismThreshold,
3710	+	Fun<? super K, ? extends U> searchFunction) {
3711	+	if (searchFunction == null) throw new NullPointerException();
3712	+	return new SearchKeysTask<K,V,U>
3713	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3714	+	searchFunction, new AtomicReference<U>()).invoke();
3715	+	}
3716	+
3717	+	/**
3718	+	* Returns the result of accumulating all keys using the given
3719	+	* reducer to combine values, or null if none.
3720	+	*
3721	+	* @param parallelismThreshold the (estimated) number of elements
3722	+	* needed for this operation to be executed in parallel
3723	+	* @param reducer a commutative associative combining function
3724	+	* @return the result of accumulating all keys using the given
3725	+	* reducer to combine values, or null if none
3726	+	* @since 1.8
3727	+	*/
3728	+	public K reduceKeys(long parallelismThreshold,
3729	+	BiFun<? super K, ? super K, ? extends K> reducer) {
3730	+	if (reducer == null) throw new NullPointerException();
3731	+	return new ReduceKeysTask<K,V>
3732	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3733	+	null, reducer).invoke();
3734	+	}
3735	+
3736	+	/**
3737	+	* Returns the result of accumulating the given transformation
3738	+	* of all keys using the given reducer to combine values, or
3739	+	* null if none.
3740	+	*
3741	+	* @param parallelismThreshold the (estimated) number of elements
3742	+	* needed for this operation to be executed in parallel
3743	+	* @param transformer a function returning the transformation
3744	+	* for an element, or null if there is no transformation (in
3745	+	* which case it is not combined)
3746	+	* @param reducer a commutative associative combining function
3747	+	* @return the result of accumulating the given transformation
3748	+	* of all keys
3749	+	* @since 1.8
3750	+	*/
3751	+	public <U> U reduceKeys(long parallelismThreshold,
3752	+	Fun<? super K, ? extends U> transformer,
3753	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3754	+	if (transformer == null || reducer == null)
3755	+	throw new NullPointerException();
3756	+	return new MapReduceKeysTask<K,V,U>
3757	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3758	+	null, transformer, reducer).invoke();
3759	+	}
3760	+
3761	+	/**
3762	+	* Returns the result of accumulating the given transformation
3763	+	* of all keys using the given reducer to combine values, and
3764	+	* the given basis as an identity value.
3765	+	*
3766	+	* @param parallelismThreshold the (estimated) number of elements
3767	+	* needed for this operation to be executed in parallel
3768	+	* @param transformer a function returning the transformation
3769	+	* for an element
3770	+	* @param basis the identity (initial default value) for the reduction
3771	+	* @param reducer a commutative associative combining function
3772	+	* @return the result of accumulating the given transformation
3773	+	* of all keys
3774	+	* @since 1.8
3775	+	*/
3776	+	public double reduceKeysToDouble(long parallelismThreshold,
3777	+	ObjectToDouble<? super K> transformer,
3778	+	double basis,
3779	+	DoubleByDoubleToDouble reducer) {
3780	+	if (transformer == null || reducer == null)
3781	+	throw new NullPointerException();
3782	+	return new MapReduceKeysToDoubleTask<K,V>
3783	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3784	+	null, transformer, basis, reducer).invoke();
3785	+	}
3786	+
3787	+	/**
3788	+	* Returns the result of accumulating the given transformation
3789	+	* of all keys using the given reducer to combine values, and
3790	+	* the given basis as an identity value.
3791	+	*
3792	+	* @param parallelismThreshold the (estimated) number of elements
3793	+	* needed for this operation to be executed in parallel
3794	+	* @param transformer a function returning the transformation
3795	+	* for an element
3796	+	* @param basis the identity (initial default value) for the reduction
3797	+	* @param reducer a commutative associative combining function
3798	+	* @return the result of accumulating the given transformation
3799	+	* of all keys
3800	+	* @since 1.8
3801	+	*/
3802	+	public long reduceKeysToLong(long parallelismThreshold,
3803	+	ObjectToLong<? super K> transformer,
3804	+	long basis,
3805	+	LongByLongToLong reducer) {
3806	+	if (transformer == null || reducer == null)
3807	+	throw new NullPointerException();
3808	+	return new MapReduceKeysToLongTask<K,V>
3809	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3810	+	null, transformer, basis, reducer).invoke();
3811	+	}
3812	+
3813	+	/**
3814	+	* Returns the result of accumulating the given transformation
3815	+	* of all keys using the given reducer to combine values, and
3816	+	* the given basis as an identity value.
3817	+	*
3818	+	* @param parallelismThreshold the (estimated) number of elements
3819	+	* needed for this operation to be executed in parallel
3820	+	* @param transformer a function returning the transformation
3821	+	* for an element
3822	+	* @param basis the identity (initial default value) for the reduction
3823	+	* @param reducer a commutative associative combining function
3824	+	* @return the result of accumulating the given transformation
3825	+	* of all keys
3826	+	* @since 1.8
3827	+	*/
3828	+	public int reduceKeysToInt(long parallelismThreshold,
3829	+	ObjectToInt<? super K> transformer,
3830	+	int basis,
3831	+	IntByIntToInt reducer) {
3832	+	if (transformer == null || reducer == null)
3833	+	throw new NullPointerException();
3834	+	return new MapReduceKeysToIntTask<K,V>
3835	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3836	+	null, transformer, basis, reducer).invoke();
3837	+	}
3838	+
3839	+	/**
3840	+	* Performs the given action for each value.
3841	+	*
3842	+	* @param parallelismThreshold the (estimated) number of elements
3843	+	* needed for this operation to be executed in parallel
3844	+	* @param action the action
3845	+	* @since 1.8
3846	+	*/
3847	+	public void forEachValue(long parallelismThreshold,
3848	+	Action<? super V> action) {
3849	+	if (action == null)
3850	+	throw new NullPointerException();
3851	+	new ForEachValueTask<K,V>
3852	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3853	+	action).invoke();
3854	+	}
3855	+
3856	+	/**
3857	+	* Performs the given action for each non-null transformation
3858	+	* of each value.
3859	+	*
3860	+	* @param parallelismThreshold the (estimated) number of elements
3861	+	* needed for this operation to be executed in parallel
3862	+	* @param transformer a function returning the transformation
3863	+	* for an element, or null if there is no transformation (in
3864	+	* which case the action is not applied)
3865	+	* @param action the action
3866	+	* @since 1.8
3867	+	*/
3868	+	public <U> void forEachValue(long parallelismThreshold,
3869	+	Fun<? super V, ? extends U> transformer,
3870	+	Action<? super U> action) {
3871	+	if (transformer == null || action == null)
3872	+	throw new NullPointerException();
3873	+	new ForEachTransformedValueTask<K,V,U>
3874	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3875	+	transformer, action).invoke();
3876	+	}
3877	+
3878	+	/**
3879	+	* Returns a non-null result from applying the given search
3880	+	* function on each value, or null if none.  Upon success,
3881	+	* further element processing is suppressed and the results of
3882	+	* any other parallel invocations of the search function are
3883	+	* ignored.
3884	+	*
3885	+	* @param parallelismThreshold the (estimated) number of elements
3886	+	* needed for this operation to be executed in parallel
3887	+	* @param searchFunction a function returning a non-null
3888	+	* result on success, else null
3889	+	* @return a non-null result from applying the given search
3890	+	* function on each value, or null if none
3891	+	* @since 1.8
3892	+	*/
3893	+	public <U> U searchValues(long parallelismThreshold,
3894	+	Fun<? super V, ? extends U> searchFunction) {
3895	+	if (searchFunction == null) throw new NullPointerException();
3896	+	return new SearchValuesTask<K,V,U>
3897	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3898	+	searchFunction, new AtomicReference<U>()).invoke();
3899	+	}
3900	+
3901	+	/**
3902	+	* Returns the result of accumulating all values using the
3903	+	* given reducer to combine values, or null if none.
3904	+	*
3905	+	* @param parallelismThreshold the (estimated) number of elements
3906	+	* needed for this operation to be executed in parallel
3907	+	* @param reducer a commutative associative combining function
3908	+	* @return the result of accumulating all values
3909	+	* @since 1.8
3910	+	*/
3911	+	public V reduceValues(long parallelismThreshold,
3912	+	BiFun<? super V, ? super V, ? extends V> reducer) {
3913	+	if (reducer == null) throw new NullPointerException();
3914	+	return new ReduceValuesTask<K,V>
3915	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3916	+	null, reducer).invoke();
3917	+	}
3918	+
3919	+	/**
3920	+	* Returns the result of accumulating the given transformation
3921	+	* of all values using the given reducer to combine values, or
3922	+	* null if none.
3923	+	*
3924	+	* @param parallelismThreshold the (estimated) number of elements
3925	+	* needed for this operation to be executed in parallel
3926	+	* @param transformer a function returning the transformation
3927	+	* for an element, or null if there is no transformation (in
3928	+	* which case it is not combined)
3929	+	* @param reducer a commutative associative combining function
3930	+	* @return the result of accumulating the given transformation
3931	+	* of all values
3932	+	* @since 1.8
3933	+	*/
3934	+	public <U> U reduceValues(long parallelismThreshold,
3935	+	Fun<? super V, ? extends U> transformer,
3936	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3937	+	if (transformer == null || reducer == null)
3938	+	throw new NullPointerException();
3939	+	return new MapReduceValuesTask<K,V,U>
3940	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3941	+	null, transformer, reducer).invoke();
3942	+	}
3943	+
3944	+	/**
3945	+	* Returns the result of accumulating the given transformation
3946	+	* of all values using the given reducer to combine values,
3947	+	* and the given basis as an identity value.
3948	+	*
3949	+	* @param parallelismThreshold the (estimated) number of elements
3950	+	* needed for this operation to be executed in parallel
3951	+	* @param transformer a function returning the transformation
3952	+	* for an element
3953	+	* @param basis the identity (initial default value) for the reduction
3954	+	* @param reducer a commutative associative combining function
3955	+	* @return the result of accumulating the given transformation
3956	+	* of all values
3957	+	* @since 1.8
3958	+	*/
3959	+	public double reduceValuesToDouble(long parallelismThreshold,
3960	+	ObjectToDouble<? super V> transformer,
3961	+	double basis,
3962	+	DoubleByDoubleToDouble reducer) {
3963	+	if (transformer == null || reducer == null)
3964	+	throw new NullPointerException();
3965	+	return new MapReduceValuesToDoubleTask<K,V>
3966	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3967	+	null, transformer, basis, reducer).invoke();
3968	+	}
3969	+
3970	+	/**
3971	+	* Returns the result of accumulating the given transformation
3972	+	* of all values using the given reducer to combine values,
3973	+	* and the given basis as an identity value.
3974	+	*
3975	+	* @param parallelismThreshold the (estimated) number of elements
3976	+	* needed for this operation to be executed in parallel
3977	+	* @param transformer a function returning the transformation
3978	+	* for an element
3979	+	* @param basis the identity (initial default value) for the reduction
3980	+	* @param reducer a commutative associative combining function
3981	+	* @return the result of accumulating the given transformation
3982	+	* of all values
3983	+	* @since 1.8
3984	+	*/
3985	+	public long reduceValuesToLong(long parallelismThreshold,
3986	+	ObjectToLong<? super V> transformer,
3987	+	long basis,
3988	+	LongByLongToLong reducer) {
3989	+	if (transformer == null || reducer == null)
3990	+	throw new NullPointerException();
3991	+	return new MapReduceValuesToLongTask<K,V>
3992	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3993	+	null, transformer, basis, reducer).invoke();
3994	+	}
3995	+
3996	+	/**
3997	+	* Returns the result of accumulating the given transformation
3998	+	* of all values using the given reducer to combine values,
3999	+	* and the given basis as an identity value.
4000	+	*
4001	+	* @param parallelismThreshold the (estimated) number of elements
4002	+	* needed for this operation to be executed in parallel
4003	+	* @param transformer a function returning the transformation
4004	+	* for an element
4005	+	* @param basis the identity (initial default value) for the reduction
4006	+	* @param reducer a commutative associative combining function
4007	+	* @return the result of accumulating the given transformation
4008	+	* of all values
4009	+	* @since 1.8
4010	+	*/
4011	+	public int reduceValuesToInt(long parallelismThreshold,
4012	+	ObjectToInt<? super V> transformer,
4013	+	int basis,
4014	+	IntByIntToInt reducer) {
4015	+	if (transformer == null || reducer == null)
4016	+	throw new NullPointerException();
4017	+	return new MapReduceValuesToIntTask<K,V>
4018	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4019	+	null, transformer, basis, reducer).invoke();
4020	+	}
4021	+
4022	+	/**
4023	+	* Performs the given action for each entry.
4024	+	*
4025	+	* @param parallelismThreshold the (estimated) number of elements
4026	+	* needed for this operation to be executed in parallel
4027	+	* @param action the action
4028	+	* @since 1.8
4029	+	*/
4030	+	public void forEachEntry(long parallelismThreshold,
4031	+	Action<? super Map.Entry<K,V>> action) {
4032	+	if (action == null) throw new NullPointerException();
4033	+	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
4034	+	action).invoke();
4035	+	}
4036	+
4037	+	/**
4038	+	* Performs the given action for each non-null transformation
4039	+	* of each entry.
4040	+	*
4041	+	* @param parallelismThreshold the (estimated) number of elements
4042	+	* needed for this operation to be executed in parallel
4043	+	* @param transformer a function returning the transformation
4044	+	* for an element, or null if there is no transformation (in
4045	+	* which case the action is not applied)
4046	+	* @param action the action
4047	+	* @since 1.8
4048	+	*/
4049	+	public <U> void forEachEntry(long parallelismThreshold,
4050	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
4051	+	Action<? super U> action) {
4052	+	if (transformer == null || action == null)
4053	+	throw new NullPointerException();
4054	+	new ForEachTransformedEntryTask<K,V,U>
4055	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4056	+	transformer, action).invoke();
4057	+	}
4058	+
4059	+	/**
4060	+	* Returns a non-null result from applying the given search
4061	+	* function on each entry, or null if none.  Upon success,
4062	+	* further element processing is suppressed and the results of
4063	+	* any other parallel invocations of the search function are
4064	+	* ignored.
4065	+	*
4066	+	* @param parallelismThreshold the (estimated) number of elements
4067	+	* needed for this operation to be executed in parallel
4068	+	* @param searchFunction a function returning a non-null
4069	+	* result on success, else null
4070	+	* @return a non-null result from applying the given search
4071	+	* function on each entry, or null if none
4072	+	* @since 1.8
4073	+	*/
4074	+	public <U> U searchEntries(long parallelismThreshold,
4075	+	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4076	+	if (searchFunction == null) throw new NullPointerException();
4077	+	return new SearchEntriesTask<K,V,U>
4078	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4079	+	searchFunction, new AtomicReference<U>()).invoke();
4080	+	}
4081	+
4082	+	/**
4083	+	* Returns the result of accumulating all entries using the
4084	+	* given reducer to combine values, or null if none.
4085	+	*
4086	+	* @param parallelismThreshold the (estimated) number of elements
4087	+	* needed for this operation to be executed in parallel
4088	+	* @param reducer a commutative associative combining function
4089	+	* @return the result of accumulating all entries
4090	+	* @since 1.8
4091	+	*/
4092	+	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4093	+	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4094	+	if (reducer == null) throw new NullPointerException();
4095	+	return new ReduceEntriesTask<K,V>
4096	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4097	+	null, reducer).invoke();
4098	+	}
4099	+
4100	+	/**
4101	+	* Returns the result of accumulating the given transformation
4102	+	* of all entries using the given reducer to combine values,
4103	+	* or null if none.
4104	+	*
4105	+	* @param parallelismThreshold the (estimated) number of elements
4106	+	* needed for this operation to be executed in parallel
4107	+	* @param transformer a function returning the transformation
4108	+	* for an element, or null if there is no transformation (in
4109	+	* which case it is not combined)
4110	+	* @param reducer a commutative associative combining function
4111	+	* @return the result of accumulating the given transformation
4112	+	* of all entries
4113	+	* @since 1.8
4114	+	*/
4115	+	public <U> U reduceEntries(long parallelismThreshold,
4116	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
4117	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4118	+	if (transformer == null || reducer == null)
4119	+	throw new NullPointerException();
4120	+	return new MapReduceEntriesTask<K,V,U>
4121	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4122	+	null, transformer, reducer).invoke();
4123	+	}
4124	+
4125	+	/**
4126	+	* Returns the result of accumulating the given transformation
4127	+	* of all entries using the given reducer to combine values,
4128	+	* and the given basis as an identity value.
4129	+	*
4130	+	* @param parallelismThreshold the (estimated) number of elements
4131	+	* needed for this operation to be executed in parallel
4132	+	* @param transformer a function returning the transformation
4133	+	* for an element
4134	+	* @param basis the identity (initial default value) for the reduction
4135	+	* @param reducer a commutative associative combining function
4136	+	* @return the result of accumulating the given transformation
4137	+	* of all entries
4138	+	* @since 1.8
4139	+	*/
4140	+	public double reduceEntriesToDouble(long parallelismThreshold,
4141	+	ObjectToDouble<Map.Entry<K,V>> transformer,
4142	+	double basis,
4143	+	DoubleByDoubleToDouble reducer) {
4144	+	if (transformer == null || reducer == null)
4145	+	throw new NullPointerException();
4146	+	return new MapReduceEntriesToDoubleTask<K,V>
4147	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4148	+	null, transformer, basis, reducer).invoke();
4149	+	}
4150	+
4151	+	/**
4152	+	* Returns the result of accumulating the given transformation
4153	+	* of all entries using the given reducer to combine values,
4154	+	* and the given basis as an identity value.
4155	+	*
4156	+	* @param parallelismThreshold the (estimated) number of elements
4157	+	* needed for this operation to be executed in parallel
4158	+	* @param transformer a function returning the transformation
4159	+	* for an element
4160	+	* @param basis the identity (initial default value) for the reduction
4161	+	* @param reducer a commutative associative combining function
4162	+	* @return the result of accumulating the given transformation
4163	+	* of all entries
4164	+	* @since 1.8
4165	+	*/
4166	+	public long reduceEntriesToLong(long parallelismThreshold,
4167	+	ObjectToLong<Map.Entry<K,V>> transformer,
4168	+	long basis,
4169	+	LongByLongToLong reducer) {
4170	+	if (transformer == null || reducer == null)
4171	+	throw new NullPointerException();
4172	+	return new MapReduceEntriesToLongTask<K,V>
4173	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4174	+	null, transformer, basis, reducer).invoke();
4175	+	}
4176	+
4177	+	/**
4178	+	* Returns the result of accumulating the given transformation
4179	+	* of all entries using the given reducer to combine values,
4180	+	* and the given basis as an identity value.
4181	+	*
4182	+	* @param parallelismThreshold the (estimated) number of elements
4183	+	* needed for this operation to be executed in parallel
4184	+	* @param transformer a function returning the transformation
4185	+	* for an element
4186	+	* @param basis the identity (initial default value) for the reduction
4187	+	* @param reducer a commutative associative combining function
4188	+	* @return the result of accumulating the given transformation
4189	+	* of all entries
4190	+	* @since 1.8
4191	+	*/
4192	+	public int reduceEntriesToInt(long parallelismThreshold,
4193	+	ObjectToInt<Map.Entry<K,V>> transformer,
4194	+	int basis,
4195	+	IntByIntToInt reducer) {
4196	+	if (transformer == null || reducer == null)
4197	+	throw new NullPointerException();
4198	+	return new MapReduceEntriesToIntTask<K,V>
4199	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4200	+	null, transformer, basis, reducer).invoke();
4201	+	}
4202	+
4203	+
4204	+	/* ----------------Views -------------- */
4205	+
4206	+	/**
4207	+	* Base class for views.
4208	+	*/
4209	+	abstract static class CollectionView<K,V,E>
4210	+	implements Collection<E>, java.io.Serializable {
4211	+	private static final long serialVersionUID = 7249069246763182397L;
4212	+	final ConcurrentHashMapV8<K,V> map;
4213	+	CollectionView(ConcurrentHashMapV8<K,V> map)  { this.map = map; }
4214	+
4215		/**
4216	<	* Returns a task that when invoked, returns a non-null result
4366	<	* from applying the given search function on each key, or
4367	<	* null if none.  Upon success, further element processing is
4368	<	* suppressed and the results of any other parallel
4369	<	* invocations of the search function are ignored.
4216	>	* Returns the map backing this view.
4217		*
4218	<	* @param map the map
4372	<	* @param searchFunction a function returning a non-null
4373	<	* result on success, else null
4374	<	* @return the task
4218	>	* @return the map backing this view
4219		*/
4220	<	public static <K,V,U> ForkJoinTask<U> searchKeys
4377	<	(ConcurrentHashMapV8<K,V> map,
4378	<	Fun<? super K, ? extends U> searchFunction) {
4379	<	if (searchFunction == null) throw new NullPointerException();
4380	<	return new SearchKeysTask<K,V,U>
4381	<	(map, null, -1, searchFunction,
4382	<	new AtomicReference<U>());
4383	<	}
4220	>	public ConcurrentHashMapV8<K,V> getMap() { return map; }
4221
4222		/**
4223	<	* Returns a task that when invoked, returns the result of
4224	<	* accumulating all keys using the given reducer to combine
4388	<	* values, or null if none.
4389	<	*
4390	<	* @param map the map
4391	<	* @param reducer a commutative associative combining function
4392	<	* @return the task
4223	>	* Removes all of the elements from this view, by removing all
4224	>	* the mappings from the map backing this view.
4225		*/
4226	<	public static <K,V> ForkJoinTask<K> reduceKeys
4227	<	(ConcurrentHashMapV8<K,V> map,
4228	<	BiFun<? super K, ? super K, ? extends K> reducer) {
4397	<	if (reducer == null) throw new NullPointerException();
4398	<	return new ReduceKeysTask<K,V>
4399	<	(map, null, -1, null, reducer);
4400	<	}
4226	>	public final void clear()      { map.clear(); }
4227	>	public final int size()        { return map.size(); }
4228	>	public final boolean isEmpty() { return map.isEmpty(); }
4229
4230	+	// implementations below rely on concrete classes supplying these
4231	+	// abstract methods
4232		/**
4233	<	* Returns a task that when invoked, returns the result of
4234	<	* accumulating the given transformation of all keys using the given
4235	<	* reducer to combine values, or null if none.
4236	<	*
4237	<	* @param map the map
4238	<	* @param transformer a function returning the transformation
4239	<	* for an element, or null of there is no transformation (in
4240	<	* which case it is not combined).
4241	<	* @param reducer a commutative associative combining function
4242	<	* @return the task
4243	<	*/
4244	<	public static <K,V,U> ForkJoinTask<U> reduceKeys
4245	<	(ConcurrentHashMapV8<K,V> map,
4246	<	Fun<? super K, ? extends U> transformer,
4247	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4248	<	if (transformer == null || reducer == null)
4249	<	throw new NullPointerException();
4250	<	return new MapReduceKeysTask<K,V,U>
4251	<	(map, null, -1, null, transformer, reducer);
4233	>	* Returns a "weakly consistent" iterator that will never
4234	>	* throw {@link ConcurrentModificationException}, and
4235	>	* guarantees to traverse elements as they existed upon
4236	>	* construction of the iterator, and may (but is not
4237	>	* guaranteed to) reflect any modifications subsequent to
4238	>	* construction.
4239	>	*/
4240	>	public abstract Iterator<E> iterator();
4241	>	public abstract boolean contains(Object o);
4242	>	public abstract boolean remove(Object o);
4243	>
4244	>	private static final String oomeMsg = "Required array size too large";
4245	>
4246	>	public final Object[] toArray() {
4247	>	long sz = map.mappingCount();
4248	>	if (sz > MAX_ARRAY_SIZE)
4249	>	throw new OutOfMemoryError(oomeMsg);
4250	>	int n = (int)sz;
4251	>	Object[] r = new Object[n];
4252	>	int i = 0;
4253	>	for (E e : this) {
4254	>	if (i == n) {
4255	>	if (n >= MAX_ARRAY_SIZE)
4256	>	throw new OutOfMemoryError(oomeMsg);
4257	>	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
4258	>	n = MAX_ARRAY_SIZE;
4259	>	else
4260	>	n += (n >>> 1) + 1;
4261	>	r = Arrays.copyOf(r, n);
4262	>	}
4263	>	r[i++] = e;
4264	>	}
4265	>	return (i == n) ? r : Arrays.copyOf(r, i);
4266		}
4267
4268	<	/**
4269	<	* Returns a task that when invoked, returns the result of
4270	<	* accumulating the given transformation of all keys using the given
4271	<	* reducer to combine values, and the given basis as an
4272	<	* identity value.
4273	<	*
4274	<	* @param map the map
4275	<	* @param transformer a function returning the transformation
4276	<	* for an element
4277	<	* @param basis the identity (initial default value) for the reduction
4278	<	* @param reducer a commutative associative combining function
4279	<	* @return the task
4280	<	*/
4281	<	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
4282	<	(ConcurrentHashMapV8<K,V> map,
4283	<	ObjectToDouble<? super K> transformer,
4284	<	double basis,
4285	<	DoubleByDoubleToDouble reducer) {
4286	<	if (transformer == null || reducer == null)
4287	<	throw new NullPointerException();
4288	<	return new MapReduceKeysToDoubleTask<K,V>
4289	<	(map, null, -1, null, transformer, basis, reducer);
4268	>	@SuppressWarnings("unchecked")
4269	>	public final <T> T[] toArray(T[] a) {
4270	>	long sz = map.mappingCount();
4271	>	if (sz > MAX_ARRAY_SIZE)
4272	>	throw new OutOfMemoryError(oomeMsg);
4273	>	int m = (int)sz;
4274	>	T[] r = (a.length >= m) ? a :
4275	>	(T[])java.lang.reflect.Array
4276	>	.newInstance(a.getClass().getComponentType(), m);
4277	>	int n = r.length;
4278	>	int i = 0;
4279	>	for (E e : this) {
4280	>	if (i == n) {
4281	>	if (n >= MAX_ARRAY_SIZE)
4282	>	throw new OutOfMemoryError(oomeMsg);
4283	>	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
4284	>	n = MAX_ARRAY_SIZE;
4285	>	else
4286	>	n += (n >>> 1) + 1;
4287	>	r = Arrays.copyOf(r, n);
4288	>	}
4289	>	r[i++] = (T)e;
4290	>	}
4291	>	if (a == r && i < n) {
4292	>	r[i] = null; // null-terminate
4293	>	return r;
4294	>	}
4295	>	return (i == n) ? r : Arrays.copyOf(r, i);
4296		}
4297
4298		/**
4299	<	* Returns a task that when invoked, returns the result of
4300	<	* accumulating the given transformation of all keys using the given
4301	<	* reducer to combine values, and the given basis as an
4302	<	* identity value.
4299	>	* Returns a string representation of this collection.
4300	>	* The string representation consists of the string representations
4301	>	* of the collection's elements in the order they are returned by
4302	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4303	>	* Adjacent elements are separated by the characters {@code ", "}
4304	>	* (comma and space).  Elements are converted to strings as by
4305	>	* {@link String#valueOf(Object)}.
4306		*
4307	<	* @param map the map
4455	<	* @param transformer a function returning the transformation
4456	<	* for an element
4457	<	* @param basis the identity (initial default value) for the reduction
4458	<	* @param reducer a commutative associative combining function
4459	<	* @return the task
4307	>	* @return a string representation of this collection
4308		*/
4309	<	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
4310	<	(ConcurrentHashMapV8<K,V> map,
4311	<	ObjectToLong<? super K> transformer,
4312	<	long basis,
4313	<	LongByLongToLong reducer) {
4314	<	if (transformer == null || reducer == null)
4315	<	throw new NullPointerException();
4316	<	return new MapReduceKeysToLongTask<K,V>
4317	<	(map, null, -1, null, transformer, basis, reducer);
4309	>	public final String toString() {
4310	>	StringBuilder sb = new StringBuilder();
4311	>	sb.append('[');
4312	>	Iterator<E> it = iterator();
4313	>	if (it.hasNext()) {
4314	>	for (;;) {
4315	>	Object e = it.next();
4316	>	sb.append(e == this ? "(this Collection)" : e);
4317	>	if (!it.hasNext())
4318	>	break;
4319	>	sb.append(',').append(' ');
4320	>	}
4321	>	}
4322	>	return sb.append(']').toString();
4323		}
4324
4325	<	/**
4326	<	* Returns a task that when invoked, returns the result of
4327	<	* accumulating the given transformation of all keys using the given
4328	<	* reducer to combine values, and the given basis as an
4329	<	* identity value.
4330	<	*
4331	<	* @param map the map
4332	<	* @param transformer a function returning the transformation
4480	<	* for an element
4481	<	* @param basis the identity (initial default value) for the reduction
4482	<	* @param reducer a commutative associative combining function
4483	<	* @return the task
4484	<	*/
4485	<	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
4486	<	(ConcurrentHashMapV8<K,V> map,
4487	<	ObjectToInt<? super K> transformer,
4488	<	int basis,
4489	<	IntByIntToInt reducer) {
4490	<	if (transformer == null || reducer == null)
4491	<	throw new NullPointerException();
4492	<	return new MapReduceKeysToIntTask<K,V>
4493	<	(map, null, -1, null, transformer, basis, reducer);
4325	>	public final boolean containsAll(Collection<?> c) {
4326	>	if (c != this) {
4327	>	for (Object e : c) {
4328	>	if (e == null || !contains(e))
4329	>	return false;
4330	>	}
4331	>	}
4332	>	return true;
4333		}
4334
4335	<	/**
4336	<	* Returns a task that when invoked, performs the given action
4337	<	* for each value.
4338	<	*
4339	<	* @param map the map
4340	<	* @param action the action
4341	<	*/
4342	<	public static <K,V> ForkJoinTask<Void> forEachValue
4343	<	(ConcurrentHashMapV8<K,V> map,
4505	<	Action<V> action) {
4506	<	if (action == null) throw new NullPointerException();
4507	<	return new ForEachValueTask<K,V>(map, null, -1, action);
4335	>	public final boolean removeAll(Collection<?> c) {
4336	>	boolean modified = false;
4337	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4338	>	if (c.contains(it.next())) {
4339	>	it.remove();
4340	>	modified = true;
4341	>	}
4342	>	}
4343	>	return modified;
4344		}
4345
4346	<	/**
4347	<	* Returns a task that when invoked, performs the given action
4348	<	* for each non-null transformation of each value.
4349	<	*
4350	<	* @param map the map
4351	<	* @param transformer a function returning the transformation
4352	<	* for an element, or null of there is no transformation (in
4353	<	* which case the action is not applied).
4354	<	* @param action the action
4519	<	*/
4520	<	public static <K,V,U> ForkJoinTask<Void> forEachValue
4521	<	(ConcurrentHashMapV8<K,V> map,
4522	<	Fun<? super V, ? extends U> transformer,
4523	<	Action<U> action) {
4524	<	if (transformer == null || action == null)
4525	<	throw new NullPointerException();
4526	<	return new ForEachTransformedValueTask<K,V,U>
4527	<	(map, null, -1, transformer, action);
4346	>	public final boolean retainAll(Collection<?> c) {
4347	>	boolean modified = false;
4348	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4349	>	if (!c.contains(it.next())) {
4350	>	it.remove();
4351	>	modified = true;
4352	>	}
4353	>	}
4354	>	return modified;
4355		}
4356
4357	<	/**
4358	<	* Returns a task that when invoked, returns a non-null result
4359	<	* from applying the given search function on each value, or
4360	<	* null if none.  Upon success, further element processing is
4361	<	* suppressed and the results of any other parallel
4362	<	* invocations of the search function are ignored.
4363	<	*
4364	<	* @param map the map
4365	<	* @param searchFunction a function returning a non-null
4366	<	* result on success, else null
4367	<	* @return the task
4368	<	*
4369	<	*/
4370	<	public static <K,V,U> ForkJoinTask<U> searchValues
4371	<	(ConcurrentHashMapV8<K,V> map,
4372	<	Fun<? super V, ? extends U> searchFunction) {
4373	<	if (searchFunction == null) throw new NullPointerException();
4374	<	return new SearchValuesTask<K,V,U>
4375	<	(map, null, -1, searchFunction,
4376	<	new AtomicReference<U>());
4357	>	}
4358	>
4359	>	/**
4360	>	* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4361	>	* which additions may optionally be enabled by mapping to a
4362	>	* common value.  This class cannot be directly instantiated.
4363	>	* See {@link #keySet() keySet()},
4364	>	* {@link #keySet(Object) keySet(V)},
4365	>	* {@link #newKeySet() newKeySet()},
4366	>	* {@link #newKeySet(int) newKeySet(int)}.
4367	>	*
4368	>	* @since 1.8
4369	>	*/
4370	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4371	>	implements Set<K>, java.io.Serializable {
4372	>	private static final long serialVersionUID = 7249069246763182397L;
4373	>	private final V value;
4374	>	KeySetView(ConcurrentHashMapV8<K,V> map, V value) {  // non-public
4375	>	super(map);
4376	>	this.value = value;
4377		}
4378
4379		/**
4380	<	* Returns a task that when invoked, returns the result of
4381	<	* accumulating all values using the given reducer to combine
4555	<	* values, or null if none.
4380	>	* Returns the default mapped value for additions,
4381	>	* or {@code null} if additions are not supported.
4382		*
4383	<	* @param map the map
4384	<	* @param reducer a commutative associative combining function
4559	<	* @return the task
4383	>	* @return the default mapped value for additions, or {@code null}
4384	>	* if not supported
4385		*/
4386	<	public static <K,V> ForkJoinTask<V> reduceValues
4562	<	(ConcurrentHashMapV8<K,V> map,
4563	<	BiFun<? super V, ? super V, ? extends V> reducer) {
4564	<	if (reducer == null) throw new NullPointerException();
4565	<	return new ReduceValuesTask<K,V>
4566	<	(map, null, -1, null, reducer);
4567	<	}
4386	>	public V getMappedValue() { return value; }
4387
4388		/**
4389	<	* Returns a task that when invoked, returns the result of
4390	<	* accumulating the given transformation of all values using the
4572	<	* given reducer to combine values, or null if none.
4573	<	*
4574	<	* @param map the map
4575	<	* @param transformer a function returning the transformation
4576	<	* for an element, or null of there is no transformation (in
4577	<	* which case it is not combined).
4578	<	* @param reducer a commutative associative combining function
4579	<	* @return the task
4389	>	* {@inheritDoc}
4390	>	* @throws NullPointerException if the specified key is null
4391		*/
4392	<	public static <K,V,U> ForkJoinTask<U> reduceValues
4582	<	(ConcurrentHashMapV8<K,V> map,
4583	<	Fun<? super V, ? extends U> transformer,
4584	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4585	<	if (transformer == null || reducer == null)
4586	<	throw new NullPointerException();
4587	<	return new MapReduceValuesTask<K,V,U>
4588	<	(map, null, -1, null, transformer, reducer);
4589	<	}
4392	>	public boolean contains(Object o) { return map.containsKey(o); }
4393
4394		/**
4395	<	* Returns a task that when invoked, returns the result of
4396	<	* accumulating the given transformation of all values using the
4397	<	* given reducer to combine values, and the given basis as an
4595	<	* identity value.
4395	>	* Removes the key from this map view, by removing the key (and its
4396	>	* corresponding value) from the backing map.  This method does
4397	>	* nothing if the key is not in the map.
4398		*
4399	<	* @param map the map
4400	<	* @param transformer a function returning the transformation
4401	<	* for an element
4600	<	* @param basis the identity (initial default value) for the reduction
4601	<	* @param reducer a commutative associative combining function
4602	<	* @return the task
4399	>	* @param  o the key to be removed from the backing map
4400	>	* @return {@code true} if the backing map contained the specified key
4401	>	* @throws NullPointerException if the specified key is null
4402		*/
4403	<	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
4605	<	(ConcurrentHashMapV8<K,V> map,
4606	<	ObjectToDouble<? super V> transformer,
4607	<	double basis,
4608	<	DoubleByDoubleToDouble reducer) {
4609	<	if (transformer == null || reducer == null)
4610	<	throw new NullPointerException();
4611	<	return new MapReduceValuesToDoubleTask<K,V>
4612	<	(map, null, -1, null, transformer, basis, reducer);
4613	<	}
4403	>	public boolean remove(Object o) { return map.remove(o) != null; }
4404
4405		/**
4406	<	* Returns a task that when invoked, returns the result of
4617	<	* accumulating the given transformation of all values using the
4618	<	* given reducer to combine values, and the given basis as an
4619	<	* identity value.
4620	<	*
4621	<	* @param map the map
4622	<	* @param transformer a function returning the transformation
4623	<	* for an element
4624	<	* @param basis the identity (initial default value) for the reduction
4625	<	* @param reducer a commutative associative combining function
4626	<	* @return the task
4406	>	* @return an iterator over the keys of the backing map
4407		*/
4408	<	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
4409	<	(ConcurrentHashMapV8<K,V> map,
4410	<	ObjectToLong<? super V> transformer,
4411	<	long basis,
4412	<	LongByLongToLong reducer) {
4633	<	if (transformer == null || reducer == null)
4634	<	throw new NullPointerException();
4635	<	return new MapReduceValuesToLongTask<K,V>
4636	<	(map, null, -1, null, transformer, basis, reducer);
4408	>	public Iterator<K> iterator() {
4409	>	Node<K,V>[] t;
4410	>	ConcurrentHashMapV8<K,V> m = map;
4411	>	int f = (t = m.table) == null ? 0 : t.length;
4412	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4413		}
4414
4415		/**
4416	<	* Returns a task that when invoked, returns the result of
4417	<	* accumulating the given transformation of all values using the
4642	<	* given reducer to combine values, and the given basis as an
4643	<	* identity value.
4416	>	* Adds the specified key to this set view by mapping the key to
4417	>	* the default mapped value in the backing map, if defined.
4418		*
4419	<	* @param map the map
4420	<	* @param transformer a function returning the transformation
4421	<	* for an element
4422	<	* @param basis the identity (initial default value) for the reduction
4423	<	* @param reducer a commutative associative combining function
4650	<	* @return the task
4419	>	* @param e key to be added
4420	>	* @return {@code true} if this set changed as a result of the call
4421	>	* @throws NullPointerException if the specified key is null
4422	>	* @throws UnsupportedOperationException if no default mapped value
4423	>	* for additions was provided
4424		*/
4425	<	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
4426	<	(ConcurrentHashMapV8<K,V> map,
4427	<	ObjectToInt<? super V> transformer,
4428	<	int basis,
4429	<	IntByIntToInt reducer) {
4657	<	if (transformer == null || reducer == null)
4658	<	throw new NullPointerException();
4659	<	return new MapReduceValuesToIntTask<K,V>
4660	<	(map, null, -1, null, transformer, basis, reducer);
4425	>	public boolean add(K e) {
4426	>	V v;
4427	>	if ((v = value) == null)
4428	>	throw new UnsupportedOperationException();
4429	>	return map.putVal(e, v, true) == null;
4430		}
4431
4432		/**
4433	<	* Returns a task that when invoked, perform the given action
4434	<	* for each entry.
4433	>	* Adds all of the elements in the specified collection to this set,
4434	>	* as if by calling {@link #add} on each one.
4435		*
4436	<	* @param map the map
4437	<	* @param action the action
4436	>	* @param c the elements to be inserted into this set
4437	>	* @return {@code true} if this set changed as a result of the call
4438	>	* @throws NullPointerException if the collection or any of its
4439	>	* elements are {@code null}
4440	>	* @throws UnsupportedOperationException if no default mapped value
4441	>	* for additions was provided
4442		*/
4443	<	public static <K,V> ForkJoinTask<Void> forEachEntry
4444	<	(ConcurrentHashMapV8<K,V> map,
4445	<	Action<Map.Entry<K,V>> action) {
4446	<	if (action == null) throw new NullPointerException();
4447	<	return new ForEachEntryTask<K,V>(map, null, -1, action);
4443	>	public boolean addAll(Collection<? extends K> c) {
4444	>	boolean added = false;
4445	>	V v;
4446	>	if ((v = value) == null)
4447	>	throw new UnsupportedOperationException();
4448	>	for (K e : c) {
4449	>	if (map.putVal(e, v, true) == null)
4450	>	added = true;
4451	>	}
4452	>	return added;
4453		}
4454
4455	<	/**
4456	<	* Returns a task that when invoked, perform the given action
4457	<	* for each non-null transformation of each entry.
4458	<	*
4459	<	* @param map the map
4682	<	* @param transformer a function returning the transformation
4683	<	* for an element, or null of there is no transformation (in
4684	<	* which case the action is not applied).
4685	<	* @param action the action
4686	<	*/
4687	<	public static <K,V,U> ForkJoinTask<Void> forEachEntry
4688	<	(ConcurrentHashMapV8<K,V> map,
4689	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4690	<	Action<U> action) {
4691	<	if (transformer == null || action == null)
4692	<	throw new NullPointerException();
4693	<	return new ForEachTransformedEntryTask<K,V,U>
4694	<	(map, null, -1, transformer, action);
4455	>	public int hashCode() {
4456	>	int h = 0;
4457	>	for (K e : this)
4458	>	h += e.hashCode();
4459	>	return h;
4460		}
4461
4462	<	/**
4463	<	* Returns a task that when invoked, returns a non-null result
4464	<	* from applying the given search function on each entry, or
4465	<	* null if none.  Upon success, further element processing is
4466	<	* suppressed and the results of any other parallel
4702	<	* invocations of the search function are ignored.
4703	<	*
4704	<	* @param map the map
4705	<	* @param searchFunction a function returning a non-null
4706	<	* result on success, else null
4707	<	* @return the task
4708	<	*
4709	<	*/
4710	<	public static <K,V,U> ForkJoinTask<U> searchEntries
4711	<	(ConcurrentHashMapV8<K,V> map,
4712	<	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4713	<	if (searchFunction == null) throw new NullPointerException();
4714	<	return new SearchEntriesTask<K,V,U>
4715	<	(map, null, -1, searchFunction,
4716	<	new AtomicReference<U>());
4462	>	public boolean equals(Object o) {
4463	>	Set<?> c;
4464	>	return ((o instanceof Set) &&
4465	>	((c = (Set<?>)o) == this ||
4466	>	(containsAll(c) && c.containsAll(this))));
4467		}
4468
4469	<	/**
4470	<	* Returns a task that when invoked, returns the result of
4471	<	* accumulating all entries using the given reducer to combine
4472	<	* values, or null if none.
4473	<	*
4474	<	* @param map the map
4725	<	* @param reducer a commutative associative combining function
4726	<	* @return the task
4727	<	*/
4728	<	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
4729	<	(ConcurrentHashMapV8<K,V> map,
4730	<	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4731	<	if (reducer == null) throw new NullPointerException();
4732	<	return new ReduceEntriesTask<K,V>
4733	<	(map, null, -1, null, reducer);
4469	>	public ConcurrentHashMapSpliterator<K> spliterator() {
4470	>	Node<K,V>[] t;
4471	>	ConcurrentHashMapV8<K,V> m = map;
4472	>	long n = m.sumCount();
4473	>	int f = (t = m.table) == null ? 0 : t.length;
4474	>	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4475		}
4476
4477	<	/**
4478	<	* Returns a task that when invoked, returns the result of
4479	<	* accumulating the given transformation of all entries using the
4480	<	* given reducer to combine values, or null if none.
4481	<	*
4482	<	* @param map the map
4483	<	* @param transformer a function returning the transformation
4484	<	* for an element, or null of there is no transformation (in
4744	<	* which case it is not combined).
4745	<	* @param reducer a commutative associative combining function
4746	<	* @return the task
4747	<	*/
4748	<	public static <K,V,U> ForkJoinTask<U> reduceEntries
4749	<	(ConcurrentHashMapV8<K,V> map,
4750	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4751	<	BiFun<? super U, ? super U, ? extends U> reducer) {
4752	<	if (transformer == null || reducer == null)
4753	<	throw new NullPointerException();
4754	<	return new MapReduceEntriesTask<K,V,U>
4755	<	(map, null, -1, null, transformer, reducer);
4477	>	public void forEach(Action<? super K> action) {
4478	>	if (action == null) throw new NullPointerException();
4479	>	Node<K,V>[] t;
4480	>	if ((t = map.table) != null) {
4481	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4482	>	for (Node<K,V> p; (p = it.advance()) != null; )
4483	>	action.apply(p.key);
4484	>	}
4485		}
4486	+	}
4487
4488	<	/**
4489	<	* Returns a task that when invoked, returns the result of
4490	<	* accumulating the given transformation of all entries using the
4491	<	* given reducer to combine values, and the given basis as an
4492	<	* identity value.
4493	<	*
4494	<	* @param map the map
4495	<	* @param transformer a function returning the transformation
4496	<	* for an element
4497	<	* @param basis the identity (initial default value) for the reduction
4498	<	* @param reducer a commutative associative combining function
4769	<	* @return the task
4770	<	*/
4771	<	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
4772	<	(ConcurrentHashMapV8<K,V> map,
4773	<	ObjectToDouble<Map.Entry<K,V>> transformer,
4774	<	double basis,
4775	<	DoubleByDoubleToDouble reducer) {
4776	<	if (transformer == null || reducer == null)
4777	<	throw new NullPointerException();
4778	<	return new MapReduceEntriesToDoubleTask<K,V>
4779	<	(map, null, -1, null, transformer, basis, reducer);
4488	>	/**
4489	>	* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4490	>	* values, in which additions are disabled. This class cannot be
4491	>	* directly instantiated. See {@link #values()}.
4492	>	*/
4493	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4494	>	implements Collection<V>, java.io.Serializable {
4495	>	private static final long serialVersionUID = 2249069246763182397L;
4496	>	ValuesView(ConcurrentHashMapV8<K,V> map) { super(map); }
4497	>	public final boolean contains(Object o) {
4498	>	return map.containsValue(o);
4499		}
4500
4501	<	/**
4502	<	* Returns a task that when invoked, returns the result of
4503	<	* accumulating the given transformation of all entries using the
4504	<	* given reducer to combine values, and the given basis as an
4505	<	* identity value.
4506	<	*
4507	<	* @param map the map
4508	<	* @param transformer a function returning the transformation
4509	<	* for an element
4510	<	* @param basis the identity (initial default value) for the reduction
4792	<	* @param reducer a commutative associative combining function
4793	<	* @return the task
4794	<	*/
4795	<	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
4796	<	(ConcurrentHashMapV8<K,V> map,
4797	<	ObjectToLong<Map.Entry<K,V>> transformer,
4798	<	long basis,
4799	<	LongByLongToLong reducer) {
4800	<	if (transformer == null || reducer == null)
4801	<	throw new NullPointerException();
4802	<	return new MapReduceEntriesToLongTask<K,V>
4803	<	(map, null, -1, null, transformer, basis, reducer);
4501	>	public final boolean remove(Object o) {
4502	>	if (o != null) {
4503	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4504	>	if (o.equals(it.next())) {
4505	>	it.remove();
4506	>	return true;
4507	>	}
4508	>	}
4509	>	}
4510	>	return false;
4511		}
4512
4513	<	/**
4514	<	* Returns a task that when invoked, returns the result of
4515	<	* accumulating the given transformation of all entries using the
4516	<	* given reducer to combine values, and the given basis as an
4517	<	* identity value.
4811	<	*
4812	<	* @param map the map
4813	<	* @param transformer a function returning the transformation
4814	<	* for an element
4815	<	* @param basis the identity (initial default value) for the reduction
4816	<	* @param reducer a commutative associative combining function
4817	<	* @return the task
4818	<	*/
4819	<	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
4820	<	(ConcurrentHashMapV8<K,V> map,
4821	<	ObjectToInt<Map.Entry<K,V>> transformer,
4822	<	int basis,
4823	<	IntByIntToInt reducer) {
4824	<	if (transformer == null || reducer == null)
4825	<	throw new NullPointerException();
4826	<	return new MapReduceEntriesToIntTask<K,V>
4827	<	(map, null, -1, null, transformer, basis, reducer);
4513	>	public final Iterator<V> iterator() {
4514	>	ConcurrentHashMapV8<K,V> m = map;
4515	>	Node<K,V>[] t;
4516	>	int f = (t = m.table) == null ? 0 : t.length;
4517	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4518		}
4829	–	}
4519
4520	<	// -------------------------------------------------------
4520	>	public final boolean add(V e) {
4521	>	throw new UnsupportedOperationException();
4522	>	}
4523	>	public final boolean addAll(Collection<? extends V> c) {
4524	>	throw new UnsupportedOperationException();
4525	>	}
4526
4527	<	/**
4528	<	* Base for FJ tasks for bulk operations. This adds a variant of
4529	<	* CountedCompleters and some split and merge bookkeeping to
4530	<	* iterator functionality. The forEach and reduce methods are
4531	<	* similar to those illustrated in CountedCompleter documentation,
4532	<	* except that bottom-up reduction completions perform them within
4533	<	* their compute methods. The search methods are like forEach
4840	<	* except they continually poll for success and exit early.  Also,
4841	<	* exceptions are handled in a simpler manner, by just trying to
4842	<	* complete root task exceptionally.
4843	<	*/
4844	<	@SuppressWarnings("serial") static abstract class BulkTask<K,V,R> extends Traverser<K,V,R> {
4845	<	final BulkTask<K,V,?> parent;  // completion target
4846	<	int batch;                     // split control; -1 for unknown
4847	<	int pending;                   // completion control
4527	>	public ConcurrentHashMapSpliterator<V> spliterator() {
4528	>	Node<K,V>[] t;
4529	>	ConcurrentHashMapV8<K,V> m = map;
4530	>	long n = m.sumCount();
4531	>	int f = (t = m.table) == null ? 0 : t.length;
4532	>	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4533	>	}
4534
4535	<	BulkTask(ConcurrentHashMapV8<K,V> map, BulkTask<K,V,?> parent,
4536	<	int batch) {
4537	<	super(map);
4538	<	this.parent = parent;
4539	<	this.batch = batch;
4540	<	if (parent != null && map != null) { // split parent
4541	<	Node[] t;
4856	<	if ((t = parent.tab) == null &&
4857	<	(t = parent.tab = map.table) != null)
4858	<	parent.baseLimit = parent.baseSize = t.length;
4859	<	this.tab = t;
4860	<	this.baseSize = parent.baseSize;
4861	<	int hi = this.baseLimit = parent.baseLimit;
4862	<	parent.baseLimit = this.index = this.baseIndex =
4863	<	(hi + parent.baseIndex + 1) >>> 1;
4535	>	public void forEach(Action<? super V> action) {
4536	>	if (action == null) throw new NullPointerException();
4537	>	Node<K,V>[] t;
4538	>	if ((t = map.table) != null) {
4539	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4540	>	for (Node<K,V> p; (p = it.advance()) != null; )
4541	>	action.apply(p.val);
4542		}
4543		}
4544	+	}
4545	+
4546	+	/**
4547	+	* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4548	+	* entries.  This class cannot be directly instantiated. See
4549	+	* {@link #entrySet()}.
4550	+	*/
4551	+	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4552	+	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4553	+	private static final long serialVersionUID = 2249069246763182397L;
4554	+	EntrySetView(ConcurrentHashMapV8<K,V> map) { super(map); }
4555	+
4556	+	public boolean contains(Object o) {
4557	+	Object k, v, r; Map.Entry<?,?> e;
4558	+	return ((o instanceof Map.Entry) &&
4559	+	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
4560	+	(r = map.get(k)) != null &&
4561	+	(v = e.getValue()) != null &&
4562	+	(v == r || v.equals(r)));
4563	+	}
4564
4565	<	// FJ methods
4565	>	public boolean remove(Object o) {
4566	>	Object k, v; Map.Entry<?,?> e;
4567	>	return ((o instanceof Map.Entry) &&
4568	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
4569	>	(v = e.getValue()) != null &&
4570	>	map.remove(k, v));
4571	>	}
4572
4573		/**
4574	<	* Propagates completion. Note that all reduce actions
4871	<	* bypass this method to combine while completing.
4574	>	* @return an iterator over the entries of the backing map
4575		*/
4576	<	final void tryComplete() {
4577	<	BulkTask<K,V,?> a = this, s = a;
4578	<	for (int c;;) {
4579	<	if ((c = a.pending) == 0) {
4580	<	if ((a = (s = a).parent) == null) {
4581	<	s.quietlyComplete();
4582	<	break;
4583	<	}
4584	<	}
4585	<	else if (U.compareAndSwapInt(a, PENDING, c, c - 1))
4586	<	break;
4576	>	public Iterator<Map.Entry<K,V>> iterator() {
4577	>	ConcurrentHashMapV8<K,V> m = map;
4578	>	Node<K,V>[] t;
4579	>	int f = (t = m.table) == null ? 0 : t.length;
4580	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4581	>	}
4582	>
4583	>	public boolean add(Entry<K,V> e) {
4584	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4585	>	}
4586	>
4587	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4588	>	boolean added = false;
4589	>	for (Entry<K,V> e : c) {
4590	>	if (add(e))
4591	>	added = true;
4592		}
4593	+	return added;
4594		}
4595
4596	<	/**
4597	<	* Forces root task to complete.
4598	<	* @param ex if null, complete normally, else exceptionally
4599	<	* @return false to simplify use
4600	<	*/
4601	<	final boolean tryCompleteComputation(Throwable ex) {
4602	<	for (BulkTask<K,V,?> a = this;;) {
4894	<	BulkTask<K,V,?> p = a.parent;
4895	<	if (p == null) {
4896	<	if (ex != null)
4897	<	a.completeExceptionally(ex);
4898	<	else
4899	<	a.quietlyComplete();
4900	<	return false;
4596	>	public final int hashCode() {
4597	>	int h = 0;
4598	>	Node<K,V>[] t;
4599	>	if ((t = map.table) != null) {
4600	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4601	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4602	>	h += p.hashCode();
4603		}
4902	–	a = p;
4604		}
4605	+	return h;
4606		}
4607
4608	<	/**
4609	<	* Version of tryCompleteComputation for function screening checks
4610	<	*/
4611	<	final boolean abortOnNullFunction() {
4612	<	return tryCompleteComputation(new Error("Unexpected null function"));
4608	>	public final boolean equals(Object o) {
4609	>	Set<?> c;
4610	>	return ((o instanceof Set) &&
4611	>	((c = (Set<?>)o) == this ||
4612	>	(containsAll(c) && c.containsAll(this))));
4613		}
4614
4615	<	// utilities
4615	>	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> spliterator() {
4616	>	Node<K,V>[] t;
4617	>	ConcurrentHashMapV8<K,V> m = map;
4618	>	long n = m.sumCount();
4619	>	int f = (t = m.table) == null ? 0 : t.length;
4620	>	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4621	>	}
4622
4623	<	/** CompareAndSet pending count */
4624	<	final boolean casPending(int cmp, int val) {
4625	<	return U.compareAndSwapInt(this, PENDING, cmp, val);
4623	>	public void forEach(Action<? super Map.Entry<K,V>> action) {
4624	>	if (action == null) throw new NullPointerException();
4625	>	Node<K,V>[] t;
4626	>	if ((t = map.table) != null) {
4627	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4628	>	for (Node<K,V> p; (p = it.advance()) != null; )
4629	>	action.apply(new MapEntry<K,V>(p.key, p.val, map));
4630	>	}
4631		}
4632
4633	<	/**
4634	<	* Returns approx exp2 of the number of times (minus one) to
4635	<	* split task by two before executing leaf action. This value
4636	<	* is faster to compute and more convenient to use as a guide
4637	<	* to splitting than is the depth, since it is used while
4638	<	* dividing by two anyway.
4639	<	*/
4640	<	final int batch() {
4641	<	ConcurrentHashMapV8<K, V> m; int b; Node[] t;
4642	<	if ((b = batch) < 0 && (m = map) != null) { // force initialization
4643	<	if ((t = tab) == null && (t = tab = m.table) != null)
4644	<	baseLimit = baseSize = t.length;
4645	<	if (t != null) {
4646	<	long n = m.counter.sum();
4647	<	int sp = getPool().getParallelism() << 3; // slack of 8
4648	<	b = batch = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
4649	<	}
4633	>	}
4634	>
4635	>	// -------------------------------------------------------
4636	>
4637	>	/**
4638	>	* Base class for bulk tasks. Repeats some fields and code from
4639	>	* class Traverser, because we need to subclass CountedCompleter.
4640	>	*/
4641	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4642	>	Node<K,V>[] tab;        // same as Traverser
4643	>	Node<K,V> next;
4644	>	int index;
4645	>	int baseIndex;
4646	>	int baseLimit;
4647	>	final int baseSize;
4648	>	int batch;              // split control
4649	>
4650	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4651	>	super(par);
4652	>	this.batch = b;
4653	>	this.index = this.baseIndex = i;
4654	>	if ((this.tab = t) == null)
4655	>	this.baseSize = this.baseLimit = 0;
4656	>	else if (par == null)
4657	>	this.baseSize = this.baseLimit = t.length;
4658	>	else {
4659	>	this.baseLimit = f;
4660	>	this.baseSize = par.baseSize;
4661		}
4938	–	return b;
4662		}
4663
4664		/**
4665	<	* Returns exportable snapshot entry.
4665	>	* Same as Traverser version
4666		*/
4667	<	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
4668	<	return new AbstractMap.SimpleEntry<K,V>(k, v);
4669	<	}
4670	<
4671	<	// Unsafe mechanics
4672	<	private static final sun.misc.Unsafe U;
4673	<	private static final long PENDING;
4674	<	static {
4675	<	try {
4676	<	U = getUnsafe();
4677	<	PENDING = U.objectFieldOffset
4678	<	(BulkTask.class.getDeclaredField("pending"));
4679	<	} catch (Exception e) {
4680	<	throw new Error(e);
4667	>	final Node<K,V> advance() {
4668	>	Node<K,V> e;
4669	>	if ((e = next) != null)
4670	>	e = e.next;
4671	>	for (;;) {
4672	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4673	>	if (e != null)
4674	>	return next = e;
4675	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4676	>	(n = t.length) <= (i = index) || i < 0)
4677	>	return next = null;
4678	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4679	>	if (e instanceof ForwardingNode) {
4680	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4681	>	e = null;
4682	>	continue;
4683	>	}
4684	>	else if (e instanceof TreeBin)
4685	>	e = ((TreeBin<K,V>)e).first;
4686	>	else
4687	>	e = null;
4688	>	}
4689	>	if ((index += baseSize) >= n)
4690	>	index = ++baseIndex;    // visit upper slots if present
4691		}
4692		}
4693		}
#	Line 4962 | Line 4695 | public class ConcurrentHashMapV8<K, V>
4695		/*
4696		* Task classes. Coded in a regular but ugly format/style to
4697		* simplify checks that each variant differs in the right way from
4698	<	* others.
4698	>	* others. The null screenings exist because compilers cannot tell
4699	>	* that we've already null-checked task arguments, so we force
4700	>	* simplest hoisted bypass to help avoid convoluted traps.
4701		*/
4702	<
4703	<	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
4702	>	@SuppressWarnings("serial")
4703	>	static final class ForEachKeyTask<K,V>
4704		extends BulkTask<K,V,Void> {
4705	<	final Action<K> action;
4705	>	final Action<? super K> action;
4706		ForEachKeyTask
4707	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4708	<	Action<K> action) {
4709	<	super(m, p, b);
4707	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4708	>	Action<? super K> action) {
4709	>	super(p, b, i, f, t);
4710		this.action = action;
4711		}
4712	<	@SuppressWarnings("unchecked") public final boolean exec() {
4713	<	final Action<K> action = this.action;
4714	<	if (action == null)
4715	<	return abortOnNullFunction();
4716	<	try {
4717	<	int b = batch(), c;
4718	<	while (b > 1 && baseIndex != baseLimit) {
4719	<	do {} while (!casPending(c = pending, c+1));
4720	<	new ForEachKeyTask<K,V>(map, this, b >>>= 1, action).fork();
4721	<	}
4722	<	while (advance() != null)
4723	<	action.apply((K)nextKey);
4724	<	tryComplete();
4990	<	} catch (Throwable ex) {
4991	<	return tryCompleteComputation(ex);
4712	>	public final void compute() {
4713	>	final Action<? super K> action;
4714	>	if ((action = this.action) != null) {
4715	>	for (int i = baseIndex, f, h; batch > 0 &&
4716	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4717	>	addToPendingCount(1);
4718	>	new ForEachKeyTask<K,V>
4719	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4720	>	action).fork();
4721	>	}
4722	>	for (Node<K,V> p; (p = advance()) != null;)
4723	>	action.apply(p.key);
4724	>	propagateCompletion();
4725		}
4993	–	return false;
4726		}
4727		}
4728
4729	<	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
4729	>	@SuppressWarnings("serial")
4730	>	static final class ForEachValueTask<K,V>
4731		extends BulkTask<K,V,Void> {
4732	<	final Action<V> action;
4732	>	final Action<? super V> action;
4733		ForEachValueTask
4734	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4735	<	Action<V> action) {
4736	<	super(m, p, b);
4734	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4735	>	Action<? super V> action) {
4736	>	super(p, b, i, f, t);
4737		this.action = action;
4738		}
4739	<	@SuppressWarnings("unchecked") public final boolean exec() {
4740	<	final Action<V> action = this.action;
4741	<	if (action == null)
4742	<	return abortOnNullFunction();
4743	<	try {
4744	<	int b = batch(), c;
4745	<	while (b > 1 && baseIndex != baseLimit) {
4746	<	do {} while (!casPending(c = pending, c+1));
4747	<	new ForEachValueTask<K,V>(map, this, b >>>= 1, action).fork();
4748	<	}
4749	<	Object v;
4750	<	while ((v = advance()) != null)
4751	<	action.apply((V)v);
5019	<	tryComplete();
5020	<	} catch (Throwable ex) {
5021	<	return tryCompleteComputation(ex);
4739	>	public final void compute() {
4740	>	final Action<? super V> action;
4741	>	if ((action = this.action) != null) {
4742	>	for (int i = baseIndex, f, h; batch > 0 &&
4743	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4744	>	addToPendingCount(1);
4745	>	new ForEachValueTask<K,V>
4746	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4747	>	action).fork();
4748	>	}
4749	>	for (Node<K,V> p; (p = advance()) != null;)
4750	>	action.apply(p.val);
4751	>	propagateCompletion();
4752		}
5023	–	return false;
4753		}
4754		}
4755
4756	<	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
4756	>	@SuppressWarnings("serial")
4757	>	static final class ForEachEntryTask<K,V>
4758		extends BulkTask<K,V,Void> {
4759	<	final Action<Entry<K,V>> action;
4759	>	final Action<? super Entry<K,V>> action;
4760		ForEachEntryTask
4761	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4762	<	Action<Entry<K,V>> action) {
4763	<	super(m, p, b);
4761	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4762	>	Action<? super Entry<K,V>> action) {
4763	>	super(p, b, i, f, t);
4764		this.action = action;
4765		}
4766	<	@SuppressWarnings("unchecked") public final boolean exec() {
4767	<	final Action<Entry<K,V>> action = this.action;
4768	<	if (action == null)
4769	<	return abortOnNullFunction();
4770	<	try {
4771	<	int b = batch(), c;
4772	<	while (b > 1 && baseIndex != baseLimit) {
4773	<	do {} while (!casPending(c = pending, c+1));
4774	<	new ForEachEntryTask<K,V>(map, this, b >>>= 1, action).fork();
4775	<	}
4776	<	Object v;
4777	<	while ((v = advance()) != null)
4778	<	action.apply(entryFor((K)nextKey, (V)v));
5049	<	tryComplete();
5050	<	} catch (Throwable ex) {
5051	<	return tryCompleteComputation(ex);
4766	>	public final void compute() {
4767	>	final Action<? super Entry<K,V>> action;
4768	>	if ((action = this.action) != null) {
4769	>	for (int i = baseIndex, f, h; batch > 0 &&
4770	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4771	>	addToPendingCount(1);
4772	>	new ForEachEntryTask<K,V>
4773	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4774	>	action).fork();
4775	>	}
4776	>	for (Node<K,V> p; (p = advance()) != null; )
4777	>	action.apply(p);
4778	>	propagateCompletion();
4779		}
5053	–	return false;
4780		}
4781		}
4782
4783	<	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
4783	>	@SuppressWarnings("serial")
4784	>	static final class ForEachMappingTask<K,V>
4785		extends BulkTask<K,V,Void> {
4786	<	final BiAction<K,V> action;
4786	>	final BiAction<? super K, ? super V> action;
4787		ForEachMappingTask
4788	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4789	<	BiAction<K,V> action) {
4790	<	super(m, p, b);
4788	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4789	>	BiAction<? super K,? super V> action) {
4790	>	super(p, b, i, f, t);
4791		this.action = action;
4792		}
4793	<	@SuppressWarnings("unchecked") public final boolean exec() {
4794	<	final BiAction<K,V> action = this.action;
4795	<	if (action == null)
4796	<	return abortOnNullFunction();
4797	<	try {
4798	<	int b = batch(), c;
4799	<	while (b > 1 && baseIndex != baseLimit) {
4800	<	do {} while (!casPending(c = pending, c+1));
4801	<	new ForEachMappingTask<K,V>(map, this, b >>>= 1,
4802	<	action).fork();
4803	<	}
4804	<	Object v;
4805	<	while ((v = advance()) != null)
5079	<	action.apply((K)nextKey, (V)v);
5080	<	tryComplete();
5081	<	} catch (Throwable ex) {
5082	<	return tryCompleteComputation(ex);
4793	>	public final void compute() {
4794	>	final BiAction<? super K, ? super V> action;
4795	>	if ((action = this.action) != null) {
4796	>	for (int i = baseIndex, f, h; batch > 0 &&
4797	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4798	>	addToPendingCount(1);
4799	>	new ForEachMappingTask<K,V>
4800	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4801	>	action).fork();
4802	>	}
4803	>	for (Node<K,V> p; (p = advance()) != null; )
4804	>	action.apply(p.key, p.val);
4805	>	propagateCompletion();
4806		}
5084	–	return false;
4807		}
4808		}
4809
4810	<	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
4810	>	@SuppressWarnings("serial")
4811	>	static final class ForEachTransformedKeyTask<K,V,U>
4812		extends BulkTask<K,V,Void> {
4813		final Fun<? super K, ? extends U> transformer;
4814	<	final Action<U> action;
4814	>	final Action<? super U> action;
4815		ForEachTransformedKeyTask
4816	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4817	<	Fun<? super K, ? extends U> transformer,
4818	<	Action<U> action) {
4819	<	super(m, p, b);
4820	<	this.transformer = transformer;
4821	<	this.action = action;
4822	<
4823	<	}
4824	<	@SuppressWarnings("unchecked") public final boolean exec() {
4825	<	final Fun<? super K, ? extends U> transformer =
4826	<	this.transformer;
4827	<	final Action<U> action = this.action;
4828	<	if (transformer == null || action == null)
5106	<	return abortOnNullFunction();
5107	<	try {
5108	<	int b = batch(), c;
5109	<	while (b > 1 && baseIndex != baseLimit) {
5110	<	do {} while (!casPending(c = pending, c+1));
4816	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4817	>	Fun<? super K, ? extends U> transformer, Action<? super U> action) {
4818	>	super(p, b, i, f, t);
4819	>	this.transformer = transformer; this.action = action;
4820	>	}
4821	>	public final void compute() {
4822	>	final Fun<? super K, ? extends U> transformer;
4823	>	final Action<? super U> action;
4824	>	if ((transformer = this.transformer) != null &&
4825	>	(action = this.action) != null) {
4826	>	for (int i = baseIndex, f, h; batch > 0 &&
4827	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4828	>	addToPendingCount(1);
4829		new ForEachTransformedKeyTask<K,V,U>
4830	<	(map, this, b >>>= 1, transformer, action).fork();
4830	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4831	>	transformer, action).fork();
4832		}
4833	<	U u;
4834	<	while (advance() != null) {
4835	<	if ((u = transformer.apply((K)nextKey)) != null)
4833	>	for (Node<K,V> p; (p = advance()) != null; ) {
4834	>	U u;
4835	>	if ((u = transformer.apply(p.key)) != null)
4836		action.apply(u);
4837		}
4838	<	tryComplete();
5120	<	} catch (Throwable ex) {
5121	<	return tryCompleteComputation(ex);
4838	>	propagateCompletion();
4839		}
5123	–	return false;
4840		}
4841		}
4842
4843	<	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
4843	>	@SuppressWarnings("serial")
4844	>	static final class ForEachTransformedValueTask<K,V,U>
4845		extends BulkTask<K,V,Void> {
4846		final Fun<? super V, ? extends U> transformer;
4847	<	final Action<U> action;
4847	>	final Action<? super U> action;
4848		ForEachTransformedValueTask
4849	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4850	<	Fun<? super V, ? extends U> transformer,
4851	<	Action<U> action) {
4852	<	super(m, p, b);
4853	<	this.transformer = transformer;
4854	<	this.action = action;
4855	<
4856	<	}
4857	<	@SuppressWarnings("unchecked") public final boolean exec() {
4858	<	final Fun<? super V, ? extends U> transformer =
4859	<	this.transformer;
4860	<	final Action<U> action = this.action;
4861	<	if (transformer == null || action == null)
5145	<	return abortOnNullFunction();
5146	<	try {
5147	<	int b = batch(), c;
5148	<	while (b > 1 && baseIndex != baseLimit) {
5149	<	do {} while (!casPending(c = pending, c+1));
4849	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4850	>	Fun<? super V, ? extends U> transformer, Action<? super U> action) {
4851	>	super(p, b, i, f, t);
4852	>	this.transformer = transformer; this.action = action;
4853	>	}
4854	>	public final void compute() {
4855	>	final Fun<? super V, ? extends U> transformer;
4856	>	final Action<? super U> action;
4857	>	if ((transformer = this.transformer) != null &&
4858	>	(action = this.action) != null) {
4859	>	for (int i = baseIndex, f, h; batch > 0 &&
4860	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4861	>	addToPendingCount(1);
4862		new ForEachTransformedValueTask<K,V,U>
4863	<	(map, this, b >>>= 1, transformer, action).fork();
4863	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4864	>	transformer, action).fork();
4865		}
4866	<	Object v; U u;
4867	<	while ((v = advance()) != null) {
4868	<	if ((u = transformer.apply((V)v)) != null)
4866	>	for (Node<K,V> p; (p = advance()) != null; ) {
4867	>	U u;
4868	>	if ((u = transformer.apply(p.val)) != null)
4869		action.apply(u);
4870		}
4871	<	tryComplete();
5159	<	} catch (Throwable ex) {
5160	<	return tryCompleteComputation(ex);
4871	>	propagateCompletion();
4872		}
5162	–	return false;
4873		}
4874		}
4875
4876	<	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
4876	>	@SuppressWarnings("serial")
4877	>	static final class ForEachTransformedEntryTask<K,V,U>
4878		extends BulkTask<K,V,Void> {
4879		final Fun<Map.Entry<K,V>, ? extends U> transformer;
4880	<	final Action<U> action;
4880	>	final Action<? super U> action;
4881		ForEachTransformedEntryTask
4882	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4883	<	Fun<Map.Entry<K,V>, ? extends U> transformer,
4884	<	Action<U> action) {
4885	<	super(m, p, b);
4886	<	this.transformer = transformer;
4887	<	this.action = action;
4888	<
4889	<	}
4890	<	@SuppressWarnings("unchecked") public final boolean exec() {
4891	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
4892	<	this.transformer;
4893	<	final Action<U> action = this.action;
4894	<	if (transformer == null || action == null)
5184	<	return abortOnNullFunction();
5185	<	try {
5186	<	int b = batch(), c;
5187	<	while (b > 1 && baseIndex != baseLimit) {
5188	<	do {} while (!casPending(c = pending, c+1));
4882	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4883	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<? super U> action) {
4884	>	super(p, b, i, f, t);
4885	>	this.transformer = transformer; this.action = action;
4886	>	}
4887	>	public final void compute() {
4888	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
4889	>	final Action<? super U> action;
4890	>	if ((transformer = this.transformer) != null &&
4891	>	(action = this.action) != null) {
4892	>	for (int i = baseIndex, f, h; batch > 0 &&
4893	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4894	>	addToPendingCount(1);
4895		new ForEachTransformedEntryTask<K,V,U>
4896	<	(map, this, b >>>= 1, transformer, action).fork();
4896	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4897	>	transformer, action).fork();
4898		}
4899	<	Object v; U u;
4900	<	while ((v = advance()) != null) {
4901	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
4899	>	for (Node<K,V> p; (p = advance()) != null; ) {
4900	>	U u;
4901	>	if ((u = transformer.apply(p)) != null)
4902		action.apply(u);
4903		}
4904	<	tryComplete();
5198	<	} catch (Throwable ex) {
5199	<	return tryCompleteComputation(ex);
4904	>	propagateCompletion();
4905		}
5201	–	return false;
4906		}
4907		}
4908
4909	<	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
4909	>	@SuppressWarnings("serial")
4910	>	static final class ForEachTransformedMappingTask<K,V,U>
4911		extends BulkTask<K,V,Void> {
4912		final BiFun<? super K, ? super V, ? extends U> transformer;
4913	<	final Action<U> action;
4913	>	final Action<? super U> action;
4914		ForEachTransformedMappingTask
4915	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4915	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4916		BiFun<? super K, ? super V, ? extends U> transformer,
4917	<	Action<U> action) {
4918	<	super(m, p, b);
4919	<	this.transformer = transformer;
4920	<	this.action = action;
4921	<
4922	<	}
4923	<	@SuppressWarnings("unchecked") public final boolean exec() {
4924	<	final BiFun<? super K, ? super V, ? extends U> transformer =
4925	<	this.transformer;
4926	<	final Action<U> action = this.action;
4927	<	if (transformer == null || action == null)
4928	<	return abortOnNullFunction();
5224	<	try {
5225	<	int b = batch(), c;
5226	<	while (b > 1 && baseIndex != baseLimit) {
5227	<	do {} while (!casPending(c = pending, c+1));
4917	>	Action<? super U> action) {
4918	>	super(p, b, i, f, t);
4919	>	this.transformer = transformer; this.action = action;
4920	>	}
4921	>	public final void compute() {
4922	>	final BiFun<? super K, ? super V, ? extends U> transformer;
4923	>	final Action<? super U> action;
4924	>	if ((transformer = this.transformer) != null &&
4925	>	(action = this.action) != null) {
4926	>	for (int i = baseIndex, f, h; batch > 0 &&
4927	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4928	>	addToPendingCount(1);
4929		new ForEachTransformedMappingTask<K,V,U>
4930	<	(map, this, b >>>= 1, transformer, action).fork();
4930	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4931	>	transformer, action).fork();
4932		}
4933	<	Object v; U u;
4934	<	while ((v = advance()) != null) {
4935	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
4933	>	for (Node<K,V> p; (p = advance()) != null; ) {
4934	>	U u;
4935	>	if ((u = transformer.apply(p.key, p.val)) != null)
4936		action.apply(u);
4937		}
4938	<	tryComplete();
5237	<	} catch (Throwable ex) {
5238	<	return tryCompleteComputation(ex);
4938	>	propagateCompletion();
4939		}
5240	–	return false;
4940		}
4941		}
4942
4943	<	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
4943	>	@SuppressWarnings("serial")
4944	>	static final class SearchKeysTask<K,V,U>
4945		extends BulkTask<K,V,U> {
4946		final Fun<? super K, ? extends U> searchFunction;
4947		final AtomicReference<U> result;
4948		SearchKeysTask
4949	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4949	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4950		Fun<? super K, ? extends U> searchFunction,
4951		AtomicReference<U> result) {
4952	<	super(m, p, b);
4952	>	super(p, b, i, f, t);
4953		this.searchFunction = searchFunction; this.result = result;
4954		}
4955	<	@SuppressWarnings("unchecked") public final boolean exec() {
4956	<	AtomicReference<U> result = this.result;
4957	<	final Fun<? super K, ? extends U> searchFunction =
4958	<	this.searchFunction;
4959	<	if (searchFunction == null || result == null)
4960	<	return abortOnNullFunction();
4961	<	try {
4962	<	int b = batch(), c;
4963	<	while (b > 1 && baseIndex != baseLimit && result.get() == null) {
4964	<	do {} while (!casPending(c = pending, c+1));
4965	<	new SearchKeysTask<K,V,U>(map, this, b >>>= 1,
4966	<	searchFunction, result).fork();
4967	<	}
4968	<	U u;
4969	<	while (result.get() == null && advance() != null) {
4970	<	if ((u = searchFunction.apply((K)nextKey)) != null) {
4955	>	public final U getRawResult() { return result.get(); }
4956	>	public final void compute() {
4957	>	final Fun<? super K, ? extends U> searchFunction;
4958	>	final AtomicReference<U> result;
4959	>	if ((searchFunction = this.searchFunction) != null &&
4960	>	(result = this.result) != null) {
4961	>	for (int i = baseIndex, f, h; batch > 0 &&
4962	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4963	>	if (result.get() != null)
4964	>	return;
4965	>	addToPendingCount(1);
4966	>	new SearchKeysTask<K,V,U>
4967	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4968	>	searchFunction, result).fork();
4969	>	}
4970	>	while (result.get() == null) {
4971	>	U u;
4972	>	Node<K,V> p;
4973	>	if ((p = advance()) == null) {
4974	>	propagateCompletion();
4975	>	break;
4976	>	}
4977	>	if ((u = searchFunction.apply(p.key)) != null) {
4978		if (result.compareAndSet(null, u))
4979	<	tryCompleteComputation(null);
4979	>	quietlyCompleteRoot();
4980		break;
4981		}
4982		}
5276	–	tryComplete();
5277	–	} catch (Throwable ex) {
5278	–	return tryCompleteComputation(ex);
4983		}
5280	–	return false;
4984		}
5282	–	public final U getRawResult() { return result.get(); }
4985		}
4986
4987	<	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
4987	>	@SuppressWarnings("serial")
4988	>	static final class SearchValuesTask<K,V,U>
4989		extends BulkTask<K,V,U> {
4990		final Fun<? super V, ? extends U> searchFunction;
4991		final AtomicReference<U> result;
4992		SearchValuesTask
4993	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
4993	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4994		Fun<? super V, ? extends U> searchFunction,
4995		AtomicReference<U> result) {
4996	<	super(m, p, b);
4996	>	super(p, b, i, f, t);
4997		this.searchFunction = searchFunction; this.result = result;
4998		}
4999	<	@SuppressWarnings("unchecked") public final boolean exec() {
5000	<	AtomicReference<U> result = this.result;
5001	<	final Fun<? super V, ? extends U> searchFunction =
5002	<	this.searchFunction;
5003	<	if (searchFunction == null || result == null)
5004	<	return abortOnNullFunction();
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	<	new SearchValuesTask<K,V,U>(map, this, b >>>= 1,
5010	<	searchFunction, result).fork();
5011	<	}
5012	<	Object v; U u;
5013	<	while (result.get() == null && (v = advance()) != null) {
5014	<	if ((u = searchFunction.apply((V)v)) != null) {
4999	>	public final U getRawResult() { return result.get(); }
5000	>	public final void compute() {
5001	>	final Fun<? super V, ? extends U> searchFunction;
5002	>	final AtomicReference<U> result;
5003	>	if ((searchFunction = this.searchFunction) != null &&
5004	>	(result = this.result) != null) {
5005	>	for (int i = baseIndex, f, h; batch > 0 &&
5006	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5007	>	if (result.get() != null)
5008	>	return;
5009	>	addToPendingCount(1);
5010	>	new SearchValuesTask<K,V,U>
5011	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5012	>	searchFunction, result).fork();
5013	>	}
5014	>	while (result.get() == null) {
5015	>	U u;
5016	>	Node<K,V> p;
5017	>	if ((p = advance()) == null) {
5018	>	propagateCompletion();
5019	>	break;
5020	>	}
5021	>	if ((u = searchFunction.apply(p.val)) != null) {
5022		if (result.compareAndSet(null, u))
5023	<	tryCompleteComputation(null);
5023	>	quietlyCompleteRoot();
5024		break;
5025		}
5026		}
5317	–	tryComplete();
5318	–	} catch (Throwable ex) {
5319	–	return tryCompleteComputation(ex);
5027		}
5321	–	return false;
5028		}
5323	–	public final U getRawResult() { return result.get(); }
5029		}
5030
5031	<	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5031	>	@SuppressWarnings("serial")
5032	>	static final class SearchEntriesTask<K,V,U>
5033		extends BulkTask<K,V,U> {
5034		final Fun<Entry<K,V>, ? extends U> searchFunction;
5035		final AtomicReference<U> result;
5036		SearchEntriesTask
5037	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5037	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5038		Fun<Entry<K,V>, ? extends U> searchFunction,
5039		AtomicReference<U> result) {
5040	<	super(m, p, b);
5040	>	super(p, b, i, f, t);
5041		this.searchFunction = searchFunction; this.result = result;
5042		}
5043	<	@SuppressWarnings("unchecked") public final boolean exec() {
5044	<	AtomicReference<U> result = this.result;
5045	<	final Fun<Entry<K,V>, ? extends U> searchFunction =
5046	<	this.searchFunction;
5047	<	if (searchFunction == null || result == null)
5048	<	return abortOnNullFunction();
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	<	new SearchEntriesTask<K,V,U>(map, this, b >>>= 1,
5054	<	searchFunction, result).fork();
5055	<	}
5056	<	Object v; U u;
5057	<	while (result.get() == null && (v = advance()) != null) {
5058	<	if ((u = searchFunction.apply(entryFor((K)nextKey, (V)v))) != null) {
5059	<	if (result.compareAndSet(null, u))
5060	<	tryCompleteComputation(null);
5043	>	public final U getRawResult() { return result.get(); }
5044	>	public final void compute() {
5045	>	final Fun<Entry<K,V>, ? extends U> searchFunction;
5046	>	final AtomicReference<U> result;
5047	>	if ((searchFunction = this.searchFunction) != null &&
5048	>	(result = this.result) != null) {
5049	>	for (int i = baseIndex, f, h; batch > 0 &&
5050	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5051	>	if (result.get() != null)
5052	>	return;
5053	>	addToPendingCount(1);
5054	>	new SearchEntriesTask<K,V,U>
5055	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5056	>	searchFunction, result).fork();
5057	>	}
5058	>	while (result.get() == null) {
5059	>	U u;
5060	>	Node<K,V> p;
5061	>	if ((p = advance()) == null) {
5062	>	propagateCompletion();
5063		break;
5064		}
5065	+	if ((u = searchFunction.apply(p)) != null) {
5066	+	if (result.compareAndSet(null, u))
5067	+	quietlyCompleteRoot();
5068	+	return;
5069	+	}
5070		}
5358	–	tryComplete();
5359	–	} catch (Throwable ex) {
5360	–	return tryCompleteComputation(ex);
5071		}
5362	–	return false;
5072		}
5364	–	public final U getRawResult() { return result.get(); }
5073		}
5074
5075	<	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5075	>	@SuppressWarnings("serial")
5076	>	static final class SearchMappingsTask<K,V,U>
5077		extends BulkTask<K,V,U> {
5078		final BiFun<? super K, ? super V, ? extends U> searchFunction;
5079		final AtomicReference<U> result;
5080		SearchMappingsTask
5081	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5081	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5082		BiFun<? super K, ? super V, ? extends U> searchFunction,
5083		AtomicReference<U> result) {
5084	<	super(m, p, b);
5084	>	super(p, b, i, f, t);
5085		this.searchFunction = searchFunction; this.result = result;
5086		}
5087	<	@SuppressWarnings("unchecked") public final boolean exec() {
5088	<	AtomicReference<U> result = this.result;
5089	<	final BiFun<? super K, ? super V, ? extends U> searchFunction =
5090	<	this.searchFunction;
5091	<	if (searchFunction == null || result == null)
5092	<	return abortOnNullFunction();
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	<	new SearchMappingsTask<K,V,U>(map, this, b >>>= 1,
5098	<	searchFunction, result).fork();
5099	<	}
5100	<	Object v; U u;
5101	<	while (result.get() == null && (v = advance()) != null) {
5102	<	if ((u = searchFunction.apply((K)nextKey, (V)v)) != null) {
5087	>	public final U getRawResult() { return result.get(); }
5088	>	public final void compute() {
5089	>	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5090	>	final AtomicReference<U> result;
5091	>	if ((searchFunction = this.searchFunction) != null &&
5092	>	(result = this.result) != null) {
5093	>	for (int i = baseIndex, f, h; batch > 0 &&
5094	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5095	>	if (result.get() != null)
5096	>	return;
5097	>	addToPendingCount(1);
5098	>	new SearchMappingsTask<K,V,U>
5099	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5100	>	searchFunction, result).fork();
5101	>	}
5102	>	while (result.get() == null) {
5103	>	U u;
5104	>	Node<K,V> p;
5105	>	if ((p = advance()) == null) {
5106	>	propagateCompletion();
5107	>	break;
5108	>	}
5109	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5110		if (result.compareAndSet(null, u))
5111	<	tryCompleteComputation(null);
5111	>	quietlyCompleteRoot();
5112		break;
5113		}
5114		}
5399	–	tryComplete();
5400	–	} catch (Throwable ex) {
5401	–	return tryCompleteComputation(ex);
5115		}
5403	–	return false;
5116		}
5405	–	public final U getRawResult() { return result.get(); }
5117		}
5118
5119	<	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5119	>	@SuppressWarnings("serial")
5120	>	static final class ReduceKeysTask<K,V>
5121		extends BulkTask<K,V,K> {
5122		final BiFun<? super K, ? super K, ? extends K> reducer;
5123		K result;
5124		ReduceKeysTask<K,V> rights, nextRight;
5125		ReduceKeysTask
5126	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5126	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5127		ReduceKeysTask<K,V> nextRight,
5128		BiFun<? super K, ? super K, ? extends K> reducer) {
5129	<	super(m, p, b); this.nextRight = nextRight;
5129	>	super(p, b, i, f, t); this.nextRight = nextRight;
5130		this.reducer = reducer;
5131		}
5132	<	@SuppressWarnings("unchecked") public final boolean exec() {
5133	<	final BiFun<? super K, ? super K, ? extends K> reducer =
5134	<	this.reducer;
5135	<	if (reducer == null)
5136	<	return abortOnNullFunction();
5137	<	try {
5138	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5427	<	do {} while (!casPending(c = pending, c+1));
5132	>	public final K getRawResult() { return result; }
5133	>	public final void compute() {
5134	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5135	>	if ((reducer = this.reducer) != null) {
5136	>	for (int i = baseIndex, f, h; batch > 0 &&
5137	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5138	>	addToPendingCount(1);
5139		(rights = new ReduceKeysTask<K,V>
5140	<	(map, this, b >>>= 1, rights, reducer)).fork();
5140	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5141	>	rights, reducer)).fork();
5142		}
5143		K r = null;
5144	<	while (advance() != null) {
5145	<	K u = (K)nextKey;
5146	<	r = (r == null) ? u : reducer.apply(r, u);
5144	>	for (Node<K,V> p; (p = advance()) != null; ) {
5145	>	K u = p.key;
5146	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5147		}
5148		result = r;
5149	<	for (ReduceKeysTask<K,V> t = this, s;;) {
5150	<	int c; BulkTask<K,V,?> par; K tr, sr;
5151	<	if ((c = t.pending) == 0) {
5152	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5153	<	if ((sr = s.result) != null)
5154	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5155	<	}
5156	<	if ((par = t.parent) == null ||
5157	<	!(par instanceof ReduceKeysTask)) {
5158	<	t.quietlyComplete();
5159	<	break;
5448	<	}
5449	<	t = (ReduceKeysTask<K,V>)par;
5149	>	CountedCompleter<?> c;
5150	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5151	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5152	>	t = (ReduceKeysTask<K,V>)c,
5153	>	s = t.rights;
5154	>	while (s != null) {
5155	>	K tr, sr;
5156	>	if ((sr = s.result) != null)
5157	>	t.result = (((tr = t.result) == null) ? sr :
5158	>	reducer.apply(tr, sr));
5159	>	s = t.rights = s.nextRight;
5160		}
5451	–	else if (t.casPending(c, c - 1))
5452	–	break;
5161		}
5454	–	} catch (Throwable ex) {
5455	–	return tryCompleteComputation(ex);
5162		}
5457	–	return false;
5163		}
5459	–	public final K getRawResult() { return result; }
5164		}
5165
5166	<	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5166	>	@SuppressWarnings("serial")
5167	>	static final class ReduceValuesTask<K,V>
5168		extends BulkTask<K,V,V> {
5169		final BiFun<? super V, ? super V, ? extends V> reducer;
5170		V result;
5171		ReduceValuesTask<K,V> rights, nextRight;
5172		ReduceValuesTask
5173	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5173	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5174		ReduceValuesTask<K,V> nextRight,
5175		BiFun<? super V, ? super V, ? extends V> reducer) {
5176	<	super(m, p, b); this.nextRight = nextRight;
5176	>	super(p, b, i, f, t); this.nextRight = nextRight;
5177		this.reducer = reducer;
5178		}
5179	<	@SuppressWarnings("unchecked") public final boolean exec() {
5180	<	final BiFun<? super V, ? super V, ? extends V> reducer =
5181	<	this.reducer;
5182	<	if (reducer == null)
5183	<	return abortOnNullFunction();
5184	<	try {
5185	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5481	<	do {} while (!casPending(c = pending, c+1));
5179	>	public final V getRawResult() { return result; }
5180	>	public final void compute() {
5181	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5182	>	if ((reducer = this.reducer) != null) {
5183	>	for (int i = baseIndex, f, h; batch > 0 &&
5184	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5185	>	addToPendingCount(1);
5186		(rights = new ReduceValuesTask<K,V>
5187	<	(map, this, b >>>= 1, rights, reducer)).fork();
5187	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5188	>	rights, reducer)).fork();
5189		}
5190		V r = null;
5191	<	Object v;
5192	<	while ((v = advance()) != null) {
5193	<	V u = (V)v;
5489	<	r = (r == null) ? u : reducer.apply(r, u);
5191	>	for (Node<K,V> p; (p = advance()) != null; ) {
5192	>	V v = p.val;
5193	>	r = (r == null) ? v : reducer.apply(r, v);
5194		}
5195		result = r;
5196	<	for (ReduceValuesTask<K,V> t = this, s;;) {
5197	<	int c; BulkTask<K,V,?> par; V tr, sr;
5198	<	if ((c = t.pending) == 0) {
5199	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5200	<	if ((sr = s.result) != null)
5201	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5202	<	}
5203	<	if ((par = t.parent) == null ||
5204	<	!(par instanceof ReduceValuesTask)) {
5205	<	t.quietlyComplete();
5206	<	break;
5503	<	}
5504	<	t = (ReduceValuesTask<K,V>)par;
5196	>	CountedCompleter<?> c;
5197	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5198	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5199	>	t = (ReduceValuesTask<K,V>)c,
5200	>	s = t.rights;
5201	>	while (s != null) {
5202	>	V tr, sr;
5203	>	if ((sr = s.result) != null)
5204	>	t.result = (((tr = t.result) == null) ? sr :
5205	>	reducer.apply(tr, sr));
5206	>	s = t.rights = s.nextRight;
5207		}
5506	–	else if (t.casPending(c, c - 1))
5507	–	break;
5208		}
5509	–	} catch (Throwable ex) {
5510	–	return tryCompleteComputation(ex);
5209		}
5512	–	return false;
5210		}
5514	–	public final V getRawResult() { return result; }
5211		}
5212
5213	<	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
5213	>	@SuppressWarnings("serial")
5214	>	static final class ReduceEntriesTask<K,V>
5215		extends BulkTask<K,V,Map.Entry<K,V>> {
5216		final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5217		Map.Entry<K,V> result;
5218		ReduceEntriesTask<K,V> rights, nextRight;
5219		ReduceEntriesTask
5220	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5220	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5221		ReduceEntriesTask<K,V> nextRight,
5222		BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5223	<	super(m, p, b); this.nextRight = nextRight;
5223	>	super(p, b, i, f, t); this.nextRight = nextRight;
5224		this.reducer = reducer;
5225		}
5226	<	@SuppressWarnings("unchecked") public final boolean exec() {
5227	<	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer =
5228	<	this.reducer;
5229	<	if (reducer == null)
5230	<	return abortOnNullFunction();
5231	<	try {
5232	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5536	<	do {} while (!casPending(c = pending, c+1));
5226	>	public final Map.Entry<K,V> getRawResult() { return result; }
5227	>	public final void compute() {
5228	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5229	>	if ((reducer = this.reducer) != null) {
5230	>	for (int i = baseIndex, f, h; batch > 0 &&
5231	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5232	>	addToPendingCount(1);
5233		(rights = new ReduceEntriesTask<K,V>
5234	<	(map, this, b >>>= 1, rights, reducer)).fork();
5234	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5235	>	rights, reducer)).fork();
5236		}
5237		Map.Entry<K,V> r = null;
5238	<	Object v;
5239	<	while ((v = advance()) != null) {
5543	<	Map.Entry<K,V> u = entryFor((K)nextKey, (V)v);
5544	<	r = (r == null) ? u : reducer.apply(r, u);
5545	<	}
5238	>	for (Node<K,V> p; (p = advance()) != null; )
5239	>	r = (r == null) ? p : reducer.apply(r, p);
5240		result = r;
5241	<	for (ReduceEntriesTask<K,V> t = this, s;;) {
5242	<	int c; BulkTask<K,V,?> par; Map.Entry<K,V> tr, sr;
5243	<	if ((c = t.pending) == 0) {
5244	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5245	<	if ((sr = s.result) != null)
5246	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5247	<	}
5248	<	if ((par = t.parent) == null ||
5249	<	!(par instanceof ReduceEntriesTask)) {
5250	<	t.quietlyComplete();
5251	<	break;
5558	<	}
5559	<	t = (ReduceEntriesTask<K,V>)par;
5241	>	CountedCompleter<?> c;
5242	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5243	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5244	>	t = (ReduceEntriesTask<K,V>)c,
5245	>	s = t.rights;
5246	>	while (s != null) {
5247	>	Map.Entry<K,V> tr, sr;
5248	>	if ((sr = s.result) != null)
5249	>	t.result = (((tr = t.result) == null) ? sr :
5250	>	reducer.apply(tr, sr));
5251	>	s = t.rights = s.nextRight;
5252		}
5561	–	else if (t.casPending(c, c - 1))
5562	–	break;
5253		}
5564	–	} catch (Throwable ex) {
5565	–	return tryCompleteComputation(ex);
5254		}
5567	–	return false;
5255		}
5569	–	public final Map.Entry<K,V> getRawResult() { return result; }
5256		}
5257
5258	<	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
5258	>	@SuppressWarnings("serial")
5259	>	static final class MapReduceKeysTask<K,V,U>
5260		extends BulkTask<K,V,U> {
5261		final Fun<? super K, ? extends U> transformer;
5262		final BiFun<? super U, ? super U, ? extends U> reducer;
5263		U result;
5264		MapReduceKeysTask<K,V,U> rights, nextRight;
5265		MapReduceKeysTask
5266	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5266	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5267		MapReduceKeysTask<K,V,U> nextRight,
5268		Fun<? super K, ? extends U> transformer,
5269		BiFun<? super U, ? super U, ? extends U> reducer) {
5270	<	super(m, p, b); this.nextRight = nextRight;
5270	>	super(p, b, i, f, t); this.nextRight = nextRight;
5271		this.transformer = transformer;
5272		this.reducer = reducer;
5273		}
5274	<	@SuppressWarnings("unchecked") public final boolean exec() {
5275	<	final Fun<? super K, ? extends U> transformer =
5276	<	this.transformer;
5277	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5278	<	this.reducer;
5279	<	if (transformer == null || reducer == null)
5280	<	return abortOnNullFunction();
5281	<	try {
5282	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5596	<	do {} while (!casPending(c = pending, c+1));
5274	>	public final U getRawResult() { return result; }
5275	>	public final void compute() {
5276	>	final Fun<? super K, ? extends U> transformer;
5277	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5278	>	if ((transformer = this.transformer) != null &&
5279	>	(reducer = this.reducer) != null) {
5280	>	for (int i = baseIndex, f, h; batch > 0 &&
5281	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5282	>	addToPendingCount(1);
5283		(rights = new MapReduceKeysTask<K,V,U>
5284	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5284	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5285	>	rights, transformer, reducer)).fork();
5286		}
5287	<	U r = null, u;
5288	<	while (advance() != null) {
5289	<	if ((u = transformer.apply((K)nextKey)) != null)
5287	>	U r = null;
5288	>	for (Node<K,V> p; (p = advance()) != null; ) {
5289	>	U u;
5290	>	if ((u = transformer.apply(p.key)) != null)
5291		r = (r == null) ? u : reducer.apply(r, u);
5292		}
5293		result = r;
5294	<	for (MapReduceKeysTask<K,V,U> t = this, s;;) {
5295	<	int c; BulkTask<K,V,?> par; U tr, sr;
5296	<	if ((c = t.pending) == 0) {
5297	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5298	<	if ((sr = s.result) != null)
5299	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5300	<	}
5301	<	if ((par = t.parent) == null ||
5302	<	!(par instanceof MapReduceKeysTask)) {
5303	<	t.quietlyComplete();
5304	<	break;
5617	<	}
5618	<	t = (MapReduceKeysTask<K,V,U>)par;
5294	>	CountedCompleter<?> c;
5295	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5296	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5297	>	t = (MapReduceKeysTask<K,V,U>)c,
5298	>	s = t.rights;
5299	>	while (s != null) {
5300	>	U tr, sr;
5301	>	if ((sr = s.result) != null)
5302	>	t.result = (((tr = t.result) == null) ? sr :
5303	>	reducer.apply(tr, sr));
5304	>	s = t.rights = s.nextRight;
5305		}
5620	–	else if (t.casPending(c, c - 1))
5621	–	break;
5306		}
5623	–	} catch (Throwable ex) {
5624	–	return tryCompleteComputation(ex);
5307		}
5626	–	return false;
5308		}
5628	–	public final U getRawResult() { return result; }
5309		}
5310
5311	<	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
5311	>	@SuppressWarnings("serial")
5312	>	static final class MapReduceValuesTask<K,V,U>
5313		extends BulkTask<K,V,U> {
5314		final Fun<? super V, ? extends U> transformer;
5315		final BiFun<? super U, ? super U, ? extends U> reducer;
5316		U result;
5317		MapReduceValuesTask<K,V,U> rights, nextRight;
5318		MapReduceValuesTask
5319	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5319	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5320		MapReduceValuesTask<K,V,U> nextRight,
5321		Fun<? super V, ? extends U> transformer,
5322		BiFun<? super U, ? super U, ? extends U> reducer) {
5323	<	super(m, p, b); this.nextRight = nextRight;
5323	>	super(p, b, i, f, t); this.nextRight = nextRight;
5324		this.transformer = transformer;
5325		this.reducer = reducer;
5326		}
5327	<	@SuppressWarnings("unchecked") public final boolean exec() {
5328	<	final Fun<? super V, ? extends U> transformer =
5329	<	this.transformer;
5330	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5331	<	this.reducer;
5332	<	if (transformer == null || reducer == null)
5333	<	return abortOnNullFunction();
5334	<	try {
5335	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5655	<	do {} while (!casPending(c = pending, c+1));
5327	>	public final U getRawResult() { return result; }
5328	>	public final void compute() {
5329	>	final Fun<? super V, ? extends U> transformer;
5330	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5331	>	if ((transformer = this.transformer) != null &&
5332	>	(reducer = this.reducer) != null) {
5333	>	for (int i = baseIndex, f, h; batch > 0 &&
5334	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5335	>	addToPendingCount(1);
5336		(rights = new MapReduceValuesTask<K,V,U>
5337	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5337	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5338	>	rights, transformer, reducer)).fork();
5339		}
5340	<	U r = null, u;
5341	<	Object v;
5342	<	while ((v = advance()) != null) {
5343	<	if ((u = transformer.apply((V)v)) != null)
5340	>	U r = null;
5341	>	for (Node<K,V> p; (p = advance()) != null; ) {
5342	>	U u;
5343	>	if ((u = transformer.apply(p.val)) != null)
5344		r = (r == null) ? u : reducer.apply(r, u);
5345		}
5346		result = r;
5347	<	for (MapReduceValuesTask<K,V,U> t = this, s;;) {
5348	<	int c; BulkTask<K,V,?> par; U tr, sr;
5349	<	if ((c = t.pending) == 0) {
5350	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5351	<	if ((sr = s.result) != null)
5352	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5353	<	}
5354	<	if ((par = t.parent) == null ||
5355	<	!(par instanceof MapReduceValuesTask)) {
5356	<	t.quietlyComplete();
5357	<	break;
5677	<	}
5678	<	t = (MapReduceValuesTask<K,V,U>)par;
5347	>	CountedCompleter<?> c;
5348	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5349	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5350	>	t = (MapReduceValuesTask<K,V,U>)c,
5351	>	s = t.rights;
5352	>	while (s != null) {
5353	>	U tr, sr;
5354	>	if ((sr = s.result) != null)
5355	>	t.result = (((tr = t.result) == null) ? sr :
5356	>	reducer.apply(tr, sr));
5357	>	s = t.rights = s.nextRight;
5358		}
5680	–	else if (t.casPending(c, c - 1))
5681	–	break;
5359		}
5683	–	} catch (Throwable ex) {
5684	–	return tryCompleteComputation(ex);
5360		}
5686	–	return false;
5361		}
5688	–	public final U getRawResult() { return result; }
5362		}
5363
5364	<	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
5364	>	@SuppressWarnings("serial")
5365	>	static final class MapReduceEntriesTask<K,V,U>
5366		extends BulkTask<K,V,U> {
5367		final Fun<Map.Entry<K,V>, ? extends U> transformer;
5368		final BiFun<? super U, ? super U, ? extends U> reducer;
5369		U result;
5370		MapReduceEntriesTask<K,V,U> rights, nextRight;
5371		MapReduceEntriesTask
5372	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5372	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5373		MapReduceEntriesTask<K,V,U> nextRight,
5374		Fun<Map.Entry<K,V>, ? extends U> transformer,
5375		BiFun<? super U, ? super U, ? extends U> reducer) {
5376	<	super(m, p, b); this.nextRight = nextRight;
5376	>	super(p, b, i, f, t); this.nextRight = nextRight;
5377		this.transformer = transformer;
5378		this.reducer = reducer;
5379		}
5380	<	@SuppressWarnings("unchecked") public final boolean exec() {
5381	<	final Fun<Map.Entry<K,V>, ? extends U> transformer =
5382	<	this.transformer;
5383	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5384	<	this.reducer;
5385	<	if (transformer == null || reducer == null)
5386	<	return abortOnNullFunction();
5387	<	try {
5388	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5715	<	do {} while (!casPending(c = pending, c+1));
5380	>	public final U getRawResult() { return result; }
5381	>	public final void compute() {
5382	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5383	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5384	>	if ((transformer = this.transformer) != null &&
5385	>	(reducer = this.reducer) != null) {
5386	>	for (int i = baseIndex, f, h; batch > 0 &&
5387	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5388	>	addToPendingCount(1);
5389		(rights = new MapReduceEntriesTask<K,V,U>
5390	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5390	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5391	>	rights, transformer, reducer)).fork();
5392		}
5393	<	U r = null, u;
5394	<	Object v;
5395	<	while ((v = advance()) != null) {
5396	<	if ((u = transformer.apply(entryFor((K)nextKey, (V)v))) != null)
5393	>	U r = null;
5394	>	for (Node<K,V> p; (p = advance()) != null; ) {
5395	>	U u;
5396	>	if ((u = transformer.apply(p)) != null)
5397		r = (r == null) ? u : reducer.apply(r, u);
5398		}
5399		result = r;
5400	<	for (MapReduceEntriesTask<K,V,U> t = this, s;;) {
5401	<	int c; BulkTask<K,V,?> par; U tr, sr;
5402	<	if ((c = t.pending) == 0) {
5403	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5404	<	if ((sr = s.result) != null)
5405	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5406	<	}
5407	<	if ((par = t.parent) == null ||
5408	<	!(par instanceof MapReduceEntriesTask)) {
5409	<	t.quietlyComplete();
5410	<	break;
5737	<	}
5738	<	t = (MapReduceEntriesTask<K,V,U>)par;
5400	>	CountedCompleter<?> c;
5401	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5402	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5403	>	t = (MapReduceEntriesTask<K,V,U>)c,
5404	>	s = t.rights;
5405	>	while (s != null) {
5406	>	U tr, sr;
5407	>	if ((sr = s.result) != null)
5408	>	t.result = (((tr = t.result) == null) ? sr :
5409	>	reducer.apply(tr, sr));
5410	>	s = t.rights = s.nextRight;
5411		}
5740	–	else if (t.casPending(c, c - 1))
5741	–	break;
5412		}
5743	–	} catch (Throwable ex) {
5744	–	return tryCompleteComputation(ex);
5413		}
5746	–	return false;
5414		}
5748	–	public final U getRawResult() { return result; }
5415		}
5416
5417	<	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
5417	>	@SuppressWarnings("serial")
5418	>	static final class MapReduceMappingsTask<K,V,U>
5419		extends BulkTask<K,V,U> {
5420		final BiFun<? super K, ? super V, ? extends U> transformer;
5421		final BiFun<? super U, ? super U, ? extends U> reducer;
5422		U result;
5423		MapReduceMappingsTask<K,V,U> rights, nextRight;
5424		MapReduceMappingsTask
5425	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5425	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5426		MapReduceMappingsTask<K,V,U> nextRight,
5427		BiFun<? super K, ? super V, ? extends U> transformer,
5428		BiFun<? super U, ? super U, ? extends U> reducer) {
5429	<	super(m, p, b); this.nextRight = nextRight;
5429	>	super(p, b, i, f, t); this.nextRight = nextRight;
5430		this.transformer = transformer;
5431		this.reducer = reducer;
5432		}
5433	<	@SuppressWarnings("unchecked") public final boolean exec() {
5434	<	final BiFun<? super K, ? super V, ? extends U> transformer =
5435	<	this.transformer;
5436	<	final BiFun<? super U, ? super U, ? extends U> reducer =
5437	<	this.reducer;
5438	<	if (transformer == null || reducer == null)
5439	<	return abortOnNullFunction();
5440	<	try {
5441	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5775	<	do {} while (!casPending(c = pending, c+1));
5433	>	public final U getRawResult() { return result; }
5434	>	public final void compute() {
5435	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5436	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5437	>	if ((transformer = this.transformer) != null &&
5438	>	(reducer = this.reducer) != null) {
5439	>	for (int i = baseIndex, f, h; batch > 0 &&
5440	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5441	>	addToPendingCount(1);
5442		(rights = new MapReduceMappingsTask<K,V,U>
5443	<	(map, this, b >>>= 1, rights, transformer, reducer)).fork();
5443	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5444	>	rights, transformer, reducer)).fork();
5445		}
5446	<	U r = null, u;
5447	<	Object v;
5448	<	while ((v = advance()) != null) {
5449	<	if ((u = transformer.apply((K)nextKey, (V)v)) != null)
5446	>	U r = null;
5447	>	for (Node<K,V> p; (p = advance()) != null; ) {
5448	>	U u;
5449	>	if ((u = transformer.apply(p.key, p.val)) != null)
5450		r = (r == null) ? u : reducer.apply(r, u);
5451		}
5452		result = r;
5453	<	for (MapReduceMappingsTask<K,V,U> t = this, s;;) {
5454	<	int c; BulkTask<K,V,?> par; U tr, sr;
5455	<	if ((c = t.pending) == 0) {
5456	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5457	<	if ((sr = s.result) != null)
5458	<	t.result = ((tr = t.result) == null) ? sr : reducer.apply(tr, sr);
5459	<	}
5460	<	if ((par = t.parent) == null ||
5461	<	!(par instanceof MapReduceMappingsTask)) {
5462	<	t.quietlyComplete();
5463	<	break;
5797	<	}
5798	<	t = (MapReduceMappingsTask<K,V,U>)par;
5453	>	CountedCompleter<?> c;
5454	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5455	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5456	>	t = (MapReduceMappingsTask<K,V,U>)c,
5457	>	s = t.rights;
5458	>	while (s != null) {
5459	>	U tr, sr;
5460	>	if ((sr = s.result) != null)
5461	>	t.result = (((tr = t.result) == null) ? sr :
5462	>	reducer.apply(tr, sr));
5463	>	s = t.rights = s.nextRight;
5464		}
5800	–	else if (t.casPending(c, c - 1))
5801	–	break;
5465		}
5803	–	} catch (Throwable ex) {
5804	–	return tryCompleteComputation(ex);
5466		}
5806	–	return false;
5467		}
5808	–	public final U getRawResult() { return result; }
5468		}
5469
5470	<	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
5470	>	@SuppressWarnings("serial")
5471	>	static final class MapReduceKeysToDoubleTask<K,V>
5472		extends BulkTask<K,V,Double> {
5473		final ObjectToDouble<? super K> transformer;
5474		final DoubleByDoubleToDouble reducer;
#	Line 5816 | Line 5476 | public class ConcurrentHashMapV8<K, V>
5476		double result;
5477		MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5478		MapReduceKeysToDoubleTask
5479	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5479	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5480		MapReduceKeysToDoubleTask<K,V> nextRight,
5481		ObjectToDouble<? super K> transformer,
5482		double basis,
5483		DoubleByDoubleToDouble reducer) {
5484	<	super(m, p, b); this.nextRight = nextRight;
5484	>	super(p, b, i, f, t); this.nextRight = nextRight;
5485		this.transformer = transformer;
5486		this.basis = basis; this.reducer = reducer;
5487		}
5488	<	@SuppressWarnings("unchecked") public final boolean exec() {
5489	<	final ObjectToDouble<? super K> transformer =
5490	<	this.transformer;
5491	<	final DoubleByDoubleToDouble reducer = this.reducer;
5492	<	if (transformer == null || reducer == null)
5493	<	return abortOnNullFunction();
5494	<	try {
5495	<	final double id = this.basis;
5496	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5497	<	do {} while (!casPending(c = pending, c+1));
5488	>	public final Double getRawResult() { return result; }
5489	>	public final void compute() {
5490	>	final ObjectToDouble<? super K> transformer;
5491	>	final DoubleByDoubleToDouble reducer;
5492	>	if ((transformer = this.transformer) != null &&
5493	>	(reducer = this.reducer) != null) {
5494	>	double r = this.basis;
5495	>	for (int i = baseIndex, f, h; batch > 0 &&
5496	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5497	>	addToPendingCount(1);
5498		(rights = new MapReduceKeysToDoubleTask<K,V>
5499	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5499	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5500	>	rights, transformer, r, reducer)).fork();
5501		}
5502	<	double r = id;
5503	<	while (advance() != null)
5843	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5502	>	for (Node<K,V> p; (p = advance()) != null; )
5503	>	r = reducer.apply(r, transformer.apply(p.key));
5504		result = r;
5505	<	for (MapReduceKeysToDoubleTask<K,V> t = this, s;;) {
5506	<	int c; BulkTask<K,V,?> par;
5507	<	if ((c = t.pending) == 0) {
5508	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5509	<	t.result = reducer.apply(t.result, s.result);
5510	<	}
5511	<	if ((par = t.parent) == null ||
5512	<	!(par instanceof MapReduceKeysToDoubleTask)) {
5853	<	t.quietlyComplete();
5854	<	break;
5855	<	}
5856	<	t = (MapReduceKeysToDoubleTask<K,V>)par;
5505	>	CountedCompleter<?> c;
5506	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5507	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5508	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5509	>	s = t.rights;
5510	>	while (s != null) {
5511	>	t.result = reducer.apply(t.result, s.result);
5512	>	s = t.rights = s.nextRight;
5513		}
5858	–	else if (t.casPending(c, c - 1))
5859	–	break;
5514		}
5861	–	} catch (Throwable ex) {
5862	–	return tryCompleteComputation(ex);
5515		}
5864	–	return false;
5516		}
5866	–	public final Double getRawResult() { return result; }
5517		}
5518
5519	<	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
5519	>	@SuppressWarnings("serial")
5520	>	static final class MapReduceValuesToDoubleTask<K,V>
5521		extends BulkTask<K,V,Double> {
5522		final ObjectToDouble<? super V> transformer;
5523		final DoubleByDoubleToDouble reducer;
#	Line 5874 | Line 5525 | public class ConcurrentHashMapV8<K, V>
5525		double result;
5526		MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5527		MapReduceValuesToDoubleTask
5528	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5528	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5529		MapReduceValuesToDoubleTask<K,V> nextRight,
5530		ObjectToDouble<? super V> transformer,
5531		double basis,
5532		DoubleByDoubleToDouble reducer) {
5533	<	super(m, p, b); this.nextRight = nextRight;
5533	>	super(p, b, i, f, t); this.nextRight = nextRight;
5534		this.transformer = transformer;
5535		this.basis = basis; this.reducer = reducer;
5536		}
5537	<	@SuppressWarnings("unchecked") public final boolean exec() {
5538	<	final ObjectToDouble<? super V> transformer =
5539	<	this.transformer;
5540	<	final DoubleByDoubleToDouble reducer = this.reducer;
5541	<	if (transformer == null || reducer == null)
5542	<	return abortOnNullFunction();
5543	<	try {
5544	<	final double id = this.basis;
5545	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5546	<	do {} while (!casPending(c = pending, c+1));
5537	>	public final Double getRawResult() { return result; }
5538	>	public final void compute() {
5539	>	final ObjectToDouble<? super V> transformer;
5540	>	final DoubleByDoubleToDouble reducer;
5541	>	if ((transformer = this.transformer) != null &&
5542	>	(reducer = this.reducer) != null) {
5543	>	double r = this.basis;
5544	>	for (int i = baseIndex, f, h; batch > 0 &&
5545	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5546	>	addToPendingCount(1);
5547		(rights = new MapReduceValuesToDoubleTask<K,V>
5548	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5548	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5549	>	rights, transformer, r, reducer)).fork();
5550		}
5551	<	double r = id;
5552	<	Object v;
5901	<	while ((v = advance()) != null)
5902	<	r = reducer.apply(r, transformer.apply((V)v));
5551	>	for (Node<K,V> p; (p = advance()) != null; )
5552	>	r = reducer.apply(r, transformer.apply(p.val));
5553		result = r;
5554	<	for (MapReduceValuesToDoubleTask<K,V> t = this, s;;) {
5555	<	int c; BulkTask<K,V,?> par;
5556	<	if ((c = t.pending) == 0) {
5557	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5558	<	t.result = reducer.apply(t.result, s.result);
5559	<	}
5560	<	if ((par = t.parent) == null ||
5561	<	!(par instanceof MapReduceValuesToDoubleTask)) {
5912	<	t.quietlyComplete();
5913	<	break;
5914	<	}
5915	<	t = (MapReduceValuesToDoubleTask<K,V>)par;
5554	>	CountedCompleter<?> c;
5555	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5556	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5557	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5558	>	s = t.rights;
5559	>	while (s != null) {
5560	>	t.result = reducer.apply(t.result, s.result);
5561	>	s = t.rights = s.nextRight;
5562		}
5917	–	else if (t.casPending(c, c - 1))
5918	–	break;
5563		}
5920	–	} catch (Throwable ex) {
5921	–	return tryCompleteComputation(ex);
5564		}
5923	–	return false;
5565		}
5925	–	public final Double getRawResult() { return result; }
5566		}
5567
5568	<	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
5568	>	@SuppressWarnings("serial")
5569	>	static final class MapReduceEntriesToDoubleTask<K,V>
5570		extends BulkTask<K,V,Double> {
5571		final ObjectToDouble<Map.Entry<K,V>> transformer;
5572		final DoubleByDoubleToDouble reducer;
#	Line 5933 | Line 5574 | public class ConcurrentHashMapV8<K, V>
5574		double result;
5575		MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5576		MapReduceEntriesToDoubleTask
5577	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5577	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5578		MapReduceEntriesToDoubleTask<K,V> nextRight,
5579		ObjectToDouble<Map.Entry<K,V>> transformer,
5580		double basis,
5581		DoubleByDoubleToDouble reducer) {
5582	<	super(m, p, b); this.nextRight = nextRight;
5582	>	super(p, b, i, f, t); this.nextRight = nextRight;
5583		this.transformer = transformer;
5584		this.basis = basis; this.reducer = reducer;
5585		}
5586	<	@SuppressWarnings("unchecked") public final boolean exec() {
5587	<	final ObjectToDouble<Map.Entry<K,V>> transformer =
5588	<	this.transformer;
5589	<	final DoubleByDoubleToDouble reducer = this.reducer;
5590	<	if (transformer == null || reducer == null)
5591	<	return abortOnNullFunction();
5592	<	try {
5593	<	final double id = this.basis;
5594	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5595	<	do {} while (!casPending(c = pending, c+1));
5586	>	public final Double getRawResult() { return result; }
5587	>	public final void compute() {
5588	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
5589	>	final DoubleByDoubleToDouble reducer;
5590	>	if ((transformer = this.transformer) != null &&
5591	>	(reducer = this.reducer) != null) {
5592	>	double r = this.basis;
5593	>	for (int i = baseIndex, f, h; batch > 0 &&
5594	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5595	>	addToPendingCount(1);
5596		(rights = new MapReduceEntriesToDoubleTask<K,V>
5597	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5597	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5598	>	rights, transformer, r, reducer)).fork();
5599		}
5600	<	double r = id;
5601	<	Object v;
5960	<	while ((v = advance()) != null)
5961	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5600	>	for (Node<K,V> p; (p = advance()) != null; )
5601	>	r = reducer.apply(r, transformer.apply(p));
5602		result = r;
5603	<	for (MapReduceEntriesToDoubleTask<K,V> t = this, s;;) {
5604	<	int c; BulkTask<K,V,?> par;
5605	<	if ((c = t.pending) == 0) {
5606	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5607	<	t.result = reducer.apply(t.result, s.result);
5608	<	}
5609	<	if ((par = t.parent) == null ||
5610	<	!(par instanceof MapReduceEntriesToDoubleTask)) {
5971	<	t.quietlyComplete();
5972	<	break;
5973	<	}
5974	<	t = (MapReduceEntriesToDoubleTask<K,V>)par;
5603	>	CountedCompleter<?> c;
5604	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5605	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5606	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5607	>	s = t.rights;
5608	>	while (s != null) {
5609	>	t.result = reducer.apply(t.result, s.result);
5610	>	s = t.rights = s.nextRight;
5611		}
5976	–	else if (t.casPending(c, c - 1))
5977	–	break;
5612		}
5979	–	} catch (Throwable ex) {
5980	–	return tryCompleteComputation(ex);
5613		}
5982	–	return false;
5614		}
5984	–	public final Double getRawResult() { return result; }
5615		}
5616
5617	<	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
5617	>	@SuppressWarnings("serial")
5618	>	static final class MapReduceMappingsToDoubleTask<K,V>
5619		extends BulkTask<K,V,Double> {
5620		final ObjectByObjectToDouble<? super K, ? super V> transformer;
5621		final DoubleByDoubleToDouble reducer;
#	Line 5992 | Line 5623 | public class ConcurrentHashMapV8<K, V>
5623		double result;
5624		MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5625		MapReduceMappingsToDoubleTask
5626	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5626	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5627		MapReduceMappingsToDoubleTask<K,V> nextRight,
5628		ObjectByObjectToDouble<? super K, ? super V> transformer,
5629		double basis,
5630		DoubleByDoubleToDouble reducer) {
5631	<	super(m, p, b); this.nextRight = nextRight;
5631	>	super(p, b, i, f, t); this.nextRight = nextRight;
5632		this.transformer = transformer;
5633		this.basis = basis; this.reducer = reducer;
5634		}
5635	<	@SuppressWarnings("unchecked") public final boolean exec() {
5636	<	final ObjectByObjectToDouble<? super K, ? super V> transformer =
5637	<	this.transformer;
5638	<	final DoubleByDoubleToDouble reducer = this.reducer;
5639	<	if (transformer == null || reducer == null)
5640	<	return abortOnNullFunction();
5641	<	try {
5642	<	final double id = this.basis;
5643	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5644	<	do {} while (!casPending(c = pending, c+1));
5635	>	public final Double getRawResult() { return result; }
5636	>	public final void compute() {
5637	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5638	>	final DoubleByDoubleToDouble reducer;
5639	>	if ((transformer = this.transformer) != null &&
5640	>	(reducer = this.reducer) != null) {
5641	>	double r = this.basis;
5642	>	for (int i = baseIndex, f, h; batch > 0 &&
5643	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5644	>	addToPendingCount(1);
5645		(rights = new MapReduceMappingsToDoubleTask<K,V>
5646	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5646	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5647	>	rights, transformer, r, reducer)).fork();
5648		}
5649	<	double r = id;
5650	<	Object v;
6019	<	while ((v = advance()) != null)
6020	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5649	>	for (Node<K,V> p; (p = advance()) != null; )
5650	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5651		result = r;
5652	<	for (MapReduceMappingsToDoubleTask<K,V> t = this, s;;) {
5653	<	int c; BulkTask<K,V,?> par;
5654	<	if ((c = t.pending) == 0) {
5655	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5656	<	t.result = reducer.apply(t.result, s.result);
5657	<	}
5658	<	if ((par = t.parent) == null ||
5659	<	!(par instanceof MapReduceMappingsToDoubleTask)) {
6030	<	t.quietlyComplete();
6031	<	break;
6032	<	}
6033	<	t = (MapReduceMappingsToDoubleTask<K,V>)par;
5652	>	CountedCompleter<?> c;
5653	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5654	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5655	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5656	>	s = t.rights;
5657	>	while (s != null) {
5658	>	t.result = reducer.apply(t.result, s.result);
5659	>	s = t.rights = s.nextRight;
5660		}
6035	–	else if (t.casPending(c, c - 1))
6036	–	break;
5661		}
6038	–	} catch (Throwable ex) {
6039	–	return tryCompleteComputation(ex);
5662		}
6041	–	return false;
5663		}
6043	–	public final Double getRawResult() { return result; }
5664		}
5665
5666	<	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
5666	>	@SuppressWarnings("serial")
5667	>	static final class MapReduceKeysToLongTask<K,V>
5668		extends BulkTask<K,V,Long> {
5669		final ObjectToLong<? super K> transformer;
5670		final LongByLongToLong reducer;
#	Line 6051 | Line 5672 | public class ConcurrentHashMapV8<K, V>
5672		long result;
5673		MapReduceKeysToLongTask<K,V> rights, nextRight;
5674		MapReduceKeysToLongTask
5675	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5675	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5676		MapReduceKeysToLongTask<K,V> nextRight,
5677		ObjectToLong<? super K> transformer,
5678		long basis,
5679		LongByLongToLong reducer) {
5680	<	super(m, p, b); this.nextRight = nextRight;
5680	>	super(p, b, i, f, t); this.nextRight = nextRight;
5681		this.transformer = transformer;
5682		this.basis = basis; this.reducer = reducer;
5683		}
5684	<	@SuppressWarnings("unchecked") public final boolean exec() {
5685	<	final ObjectToLong<? super K> transformer =
5686	<	this.transformer;
5687	<	final LongByLongToLong reducer = this.reducer;
5688	<	if (transformer == null || reducer == null)
5689	<	return abortOnNullFunction();
5690	<	try {
5691	<	final long id = this.basis;
5692	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5693	<	do {} while (!casPending(c = pending, c+1));
5684	>	public final Long getRawResult() { return result; }
5685	>	public final void compute() {
5686	>	final ObjectToLong<? super K> transformer;
5687	>	final LongByLongToLong reducer;
5688	>	if ((transformer = this.transformer) != null &&
5689	>	(reducer = this.reducer) != null) {
5690	>	long r = this.basis;
5691	>	for (int i = baseIndex, f, h; batch > 0 &&
5692	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5693	>	addToPendingCount(1);
5694		(rights = new MapReduceKeysToLongTask<K,V>
5695	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5695	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5696	>	rights, transformer, r, reducer)).fork();
5697		}
5698	<	long r = id;
5699	<	while (advance() != null)
6078	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5698	>	for (Node<K,V> p; (p = advance()) != null; )
5699	>	r = reducer.apply(r, transformer.apply(p.key));
5700		result = r;
5701	<	for (MapReduceKeysToLongTask<K,V> t = this, s;;) {
5702	<	int c; BulkTask<K,V,?> par;
5703	<	if ((c = t.pending) == 0) {
5704	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5705	<	t.result = reducer.apply(t.result, s.result);
5706	<	}
5707	<	if ((par = t.parent) == null ||
5708	<	!(par instanceof MapReduceKeysToLongTask)) {
6088	<	t.quietlyComplete();
6089	<	break;
6090	<	}
6091	<	t = (MapReduceKeysToLongTask<K,V>)par;
5701	>	CountedCompleter<?> c;
5702	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5703	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5704	>	t = (MapReduceKeysToLongTask<K,V>)c,
5705	>	s = t.rights;
5706	>	while (s != null) {
5707	>	t.result = reducer.apply(t.result, s.result);
5708	>	s = t.rights = s.nextRight;
5709		}
6093	–	else if (t.casPending(c, c - 1))
6094	–	break;
5710		}
6096	–	} catch (Throwable ex) {
6097	–	return tryCompleteComputation(ex);
5711		}
6099	–	return false;
5712		}
6101	–	public final Long getRawResult() { return result; }
5713		}
5714
5715	<	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
5715	>	@SuppressWarnings("serial")
5716	>	static final class MapReduceValuesToLongTask<K,V>
5717		extends BulkTask<K,V,Long> {
5718		final ObjectToLong<? super V> transformer;
5719		final LongByLongToLong reducer;
#	Line 6109 | Line 5721 | public class ConcurrentHashMapV8<K, V>
5721		long result;
5722		MapReduceValuesToLongTask<K,V> rights, nextRight;
5723		MapReduceValuesToLongTask
5724	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5724	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5725		MapReduceValuesToLongTask<K,V> nextRight,
5726		ObjectToLong<? super V> transformer,
5727		long basis,
5728		LongByLongToLong reducer) {
5729	<	super(m, p, b); this.nextRight = nextRight;
5729	>	super(p, b, i, f, t); this.nextRight = nextRight;
5730		this.transformer = transformer;
5731		this.basis = basis; this.reducer = reducer;
5732		}
5733	<	@SuppressWarnings("unchecked") public final boolean exec() {
5734	<	final ObjectToLong<? super V> transformer =
5735	<	this.transformer;
5736	<	final LongByLongToLong reducer = this.reducer;
5737	<	if (transformer == null || reducer == null)
5738	<	return abortOnNullFunction();
5739	<	try {
5740	<	final long id = this.basis;
5741	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5742	<	do {} while (!casPending(c = pending, c+1));
5733	>	public final Long getRawResult() { return result; }
5734	>	public final void compute() {
5735	>	final ObjectToLong<? super V> transformer;
5736	>	final LongByLongToLong reducer;
5737	>	if ((transformer = this.transformer) != null &&
5738	>	(reducer = this.reducer) != null) {
5739	>	long r = this.basis;
5740	>	for (int i = baseIndex, f, h; batch > 0 &&
5741	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5742	>	addToPendingCount(1);
5743		(rights = new MapReduceValuesToLongTask<K,V>
5744	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5744	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5745	>	rights, transformer, r, reducer)).fork();
5746		}
5747	<	long r = id;
5748	<	Object v;
6136	<	while ((v = advance()) != null)
6137	<	r = reducer.apply(r, transformer.apply((V)v));
5747	>	for (Node<K,V> p; (p = advance()) != null; )
5748	>	r = reducer.apply(r, transformer.apply(p.val));
5749		result = r;
5750	<	for (MapReduceValuesToLongTask<K,V> t = this, s;;) {
5751	<	int c; BulkTask<K,V,?> par;
5752	<	if ((c = t.pending) == 0) {
5753	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5754	<	t.result = reducer.apply(t.result, s.result);
5755	<	}
5756	<	if ((par = t.parent) == null ||
5757	<	!(par instanceof MapReduceValuesToLongTask)) {
6147	<	t.quietlyComplete();
6148	<	break;
6149	<	}
6150	<	t = (MapReduceValuesToLongTask<K,V>)par;
5750	>	CountedCompleter<?> c;
5751	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5752	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5753	>	t = (MapReduceValuesToLongTask<K,V>)c,
5754	>	s = t.rights;
5755	>	while (s != null) {
5756	>	t.result = reducer.apply(t.result, s.result);
5757	>	s = t.rights = s.nextRight;
5758		}
6152	–	else if (t.casPending(c, c - 1))
6153	–	break;
5759		}
6155	–	} catch (Throwable ex) {
6156	–	return tryCompleteComputation(ex);
5760		}
6158	–	return false;
5761		}
6160	–	public final Long getRawResult() { return result; }
5762		}
5763
5764	<	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
5764	>	@SuppressWarnings("serial")
5765	>	static final class MapReduceEntriesToLongTask<K,V>
5766		extends BulkTask<K,V,Long> {
5767		final ObjectToLong<Map.Entry<K,V>> transformer;
5768		final LongByLongToLong reducer;
#	Line 6168 | Line 5770 | public class ConcurrentHashMapV8<K, V>
5770		long result;
5771		MapReduceEntriesToLongTask<K,V> rights, nextRight;
5772		MapReduceEntriesToLongTask
5773	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5773	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5774		MapReduceEntriesToLongTask<K,V> nextRight,
5775		ObjectToLong<Map.Entry<K,V>> transformer,
5776		long basis,
5777		LongByLongToLong reducer) {
5778	<	super(m, p, b); this.nextRight = nextRight;
5778	>	super(p, b, i, f, t); this.nextRight = nextRight;
5779		this.transformer = transformer;
5780		this.basis = basis; this.reducer = reducer;
5781		}
5782	<	@SuppressWarnings("unchecked") public final boolean exec() {
5783	<	final ObjectToLong<Map.Entry<K,V>> transformer =
5784	<	this.transformer;
5785	<	final LongByLongToLong reducer = this.reducer;
5786	<	if (transformer == null || reducer == null)
5787	<	return abortOnNullFunction();
5788	<	try {
5789	<	final long id = this.basis;
5790	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5791	<	do {} while (!casPending(c = pending, c+1));
5782	>	public final Long getRawResult() { return result; }
5783	>	public final void compute() {
5784	>	final ObjectToLong<Map.Entry<K,V>> transformer;
5785	>	final LongByLongToLong reducer;
5786	>	if ((transformer = this.transformer) != null &&
5787	>	(reducer = this.reducer) != null) {
5788	>	long r = this.basis;
5789	>	for (int i = baseIndex, f, h; batch > 0 &&
5790	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5791	>	addToPendingCount(1);
5792		(rights = new MapReduceEntriesToLongTask<K,V>
5793	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5793	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5794	>	rights, transformer, r, reducer)).fork();
5795		}
5796	<	long r = id;
5797	<	Object v;
6195	<	while ((v = advance()) != null)
6196	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5796	>	for (Node<K,V> p; (p = advance()) != null; )
5797	>	r = reducer.apply(r, transformer.apply(p));
5798		result = r;
5799	<	for (MapReduceEntriesToLongTask<K,V> t = this, s;;) {
5800	<	int c; BulkTask<K,V,?> par;
5801	<	if ((c = t.pending) == 0) {
5802	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5803	<	t.result = reducer.apply(t.result, s.result);
5804	<	}
5805	<	if ((par = t.parent) == null ||
5806	<	!(par instanceof MapReduceEntriesToLongTask)) {
6206	<	t.quietlyComplete();
6207	<	break;
6208	<	}
6209	<	t = (MapReduceEntriesToLongTask<K,V>)par;
5799	>	CountedCompleter<?> c;
5800	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5801	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5802	>	t = (MapReduceEntriesToLongTask<K,V>)c,
5803	>	s = t.rights;
5804	>	while (s != null) {
5805	>	t.result = reducer.apply(t.result, s.result);
5806	>	s = t.rights = s.nextRight;
5807		}
6211	–	else if (t.casPending(c, c - 1))
6212	–	break;
5808		}
6214	–	} catch (Throwable ex) {
6215	–	return tryCompleteComputation(ex);
5809		}
6217	–	return false;
5810		}
6219	–	public final Long getRawResult() { return result; }
5811		}
5812
5813	<	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
5813	>	@SuppressWarnings("serial")
5814	>	static final class MapReduceMappingsToLongTask<K,V>
5815		extends BulkTask<K,V,Long> {
5816		final ObjectByObjectToLong<? super K, ? super V> transformer;
5817		final LongByLongToLong reducer;
#	Line 6227 | Line 5819 | public class ConcurrentHashMapV8<K, V>
5819		long result;
5820		MapReduceMappingsToLongTask<K,V> rights, nextRight;
5821		MapReduceMappingsToLongTask
5822	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5822	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5823		MapReduceMappingsToLongTask<K,V> nextRight,
5824		ObjectByObjectToLong<? super K, ? super V> transformer,
5825		long basis,
5826		LongByLongToLong reducer) {
5827	<	super(m, p, b); this.nextRight = nextRight;
5827	>	super(p, b, i, f, t); this.nextRight = nextRight;
5828		this.transformer = transformer;
5829		this.basis = basis; this.reducer = reducer;
5830		}
5831	<	@SuppressWarnings("unchecked") public final boolean exec() {
5832	<	final ObjectByObjectToLong<? super K, ? super V> transformer =
5833	<	this.transformer;
5834	<	final LongByLongToLong reducer = this.reducer;
5835	<	if (transformer == null || reducer == null)
5836	<	return abortOnNullFunction();
5837	<	try {
5838	<	final long id = this.basis;
5839	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5840	<	do {} while (!casPending(c = pending, c+1));
5831	>	public final Long getRawResult() { return result; }
5832	>	public final void compute() {
5833	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
5834	>	final LongByLongToLong reducer;
5835	>	if ((transformer = this.transformer) != null &&
5836	>	(reducer = this.reducer) != null) {
5837	>	long r = this.basis;
5838	>	for (int i = baseIndex, f, h; batch > 0 &&
5839	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5840	>	addToPendingCount(1);
5841		(rights = new MapReduceMappingsToLongTask<K,V>
5842	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5842	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5843	>	rights, transformer, r, reducer)).fork();
5844		}
5845	<	long r = id;
5846	<	Object v;
6254	<	while ((v = advance()) != null)
6255	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
5845	>	for (Node<K,V> p; (p = advance()) != null; )
5846	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5847		result = r;
5848	<	for (MapReduceMappingsToLongTask<K,V> t = this, s;;) {
5849	<	int c; BulkTask<K,V,?> par;
5850	<	if ((c = t.pending) == 0) {
5851	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5852	<	t.result = reducer.apply(t.result, s.result);
5853	<	}
5854	<	if ((par = t.parent) == null ||
5855	<	!(par instanceof MapReduceMappingsToLongTask)) {
6265	<	t.quietlyComplete();
6266	<	break;
6267	<	}
6268	<	t = (MapReduceMappingsToLongTask<K,V>)par;
5848	>	CountedCompleter<?> c;
5849	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5850	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5851	>	t = (MapReduceMappingsToLongTask<K,V>)c,
5852	>	s = t.rights;
5853	>	while (s != null) {
5854	>	t.result = reducer.apply(t.result, s.result);
5855	>	s = t.rights = s.nextRight;
5856		}
6270	–	else if (t.casPending(c, c - 1))
6271	–	break;
5857		}
6273	–	} catch (Throwable ex) {
6274	–	return tryCompleteComputation(ex);
5858		}
6276	–	return false;
5859		}
6278	–	public final Long getRawResult() { return result; }
5860		}
5861
5862	<	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
5862	>	@SuppressWarnings("serial")
5863	>	static final class MapReduceKeysToIntTask<K,V>
5864		extends BulkTask<K,V,Integer> {
5865		final ObjectToInt<? super K> transformer;
5866		final IntByIntToInt reducer;
#	Line 6286 | Line 5868 | public class ConcurrentHashMapV8<K, V>
5868		int result;
5869		MapReduceKeysToIntTask<K,V> rights, nextRight;
5870		MapReduceKeysToIntTask
5871	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5871	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5872		MapReduceKeysToIntTask<K,V> nextRight,
5873		ObjectToInt<? super K> transformer,
5874		int basis,
5875		IntByIntToInt reducer) {
5876	<	super(m, p, b); this.nextRight = nextRight;
5876	>	super(p, b, i, f, t); this.nextRight = nextRight;
5877		this.transformer = transformer;
5878		this.basis = basis; this.reducer = reducer;
5879		}
5880	<	@SuppressWarnings("unchecked") public final boolean exec() {
5881	<	final ObjectToInt<? super K> transformer =
5882	<	this.transformer;
5883	<	final IntByIntToInt reducer = this.reducer;
5884	<	if (transformer == null || reducer == null)
5885	<	return abortOnNullFunction();
5886	<	try {
5887	<	final int id = this.basis;
5888	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5889	<	do {} while (!casPending(c = pending, c+1));
5880	>	public final Integer getRawResult() { return result; }
5881	>	public final void compute() {
5882	>	final ObjectToInt<? super K> transformer;
5883	>	final IntByIntToInt reducer;
5884	>	if ((transformer = this.transformer) != null &&
5885	>	(reducer = this.reducer) != null) {
5886	>	int r = this.basis;
5887	>	for (int i = baseIndex, f, h; batch > 0 &&
5888	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5889	>	addToPendingCount(1);
5890		(rights = new MapReduceKeysToIntTask<K,V>
5891	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5891	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5892	>	rights, transformer, r, reducer)).fork();
5893		}
5894	<	int r = id;
5895	<	while (advance() != null)
6313	<	r = reducer.apply(r, transformer.apply((K)nextKey));
5894	>	for (Node<K,V> p; (p = advance()) != null; )
5895	>	r = reducer.apply(r, transformer.apply(p.key));
5896		result = r;
5897	<	for (MapReduceKeysToIntTask<K,V> t = this, s;;) {
5898	<	int c; BulkTask<K,V,?> par;
5899	<	if ((c = t.pending) == 0) {
5900	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5901	<	t.result = reducer.apply(t.result, s.result);
5902	<	}
5903	<	if ((par = t.parent) == null ||
5904	<	!(par instanceof MapReduceKeysToIntTask)) {
6323	<	t.quietlyComplete();
6324	<	break;
6325	<	}
6326	<	t = (MapReduceKeysToIntTask<K,V>)par;
5897	>	CountedCompleter<?> c;
5898	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5899	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5900	>	t = (MapReduceKeysToIntTask<K,V>)c,
5901	>	s = t.rights;
5902	>	while (s != null) {
5903	>	t.result = reducer.apply(t.result, s.result);
5904	>	s = t.rights = s.nextRight;
5905		}
6328	–	else if (t.casPending(c, c - 1))
6329	–	break;
5906		}
6331	–	} catch (Throwable ex) {
6332	–	return tryCompleteComputation(ex);
5907		}
6334	–	return false;
5908		}
6336	–	public final Integer getRawResult() { return result; }
5909		}
5910
5911	<	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
5911	>	@SuppressWarnings("serial")
5912	>	static final class MapReduceValuesToIntTask<K,V>
5913		extends BulkTask<K,V,Integer> {
5914		final ObjectToInt<? super V> transformer;
5915		final IntByIntToInt reducer;
#	Line 6344 | Line 5917 | public class ConcurrentHashMapV8<K, V>
5917		int result;
5918		MapReduceValuesToIntTask<K,V> rights, nextRight;
5919		MapReduceValuesToIntTask
5920	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5920	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5921		MapReduceValuesToIntTask<K,V> nextRight,
5922		ObjectToInt<? super V> transformer,
5923		int basis,
5924		IntByIntToInt reducer) {
5925	<	super(m, p, b); this.nextRight = nextRight;
5925	>	super(p, b, i, f, t); this.nextRight = nextRight;
5926		this.transformer = transformer;
5927		this.basis = basis; this.reducer = reducer;
5928		}
5929	<	@SuppressWarnings("unchecked") public final boolean exec() {
5930	<	final ObjectToInt<? super V> transformer =
5931	<	this.transformer;
5932	<	final IntByIntToInt reducer = this.reducer;
5933	<	if (transformer == null || reducer == null)
5934	<	return abortOnNullFunction();
5935	<	try {
5936	<	final int id = this.basis;
5937	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5938	<	do {} while (!casPending(c = pending, c+1));
5929	>	public final Integer getRawResult() { return result; }
5930	>	public final void compute() {
5931	>	final ObjectToInt<? super V> transformer;
5932	>	final IntByIntToInt reducer;
5933	>	if ((transformer = this.transformer) != null &&
5934	>	(reducer = this.reducer) != null) {
5935	>	int r = this.basis;
5936	>	for (int i = baseIndex, f, h; batch > 0 &&
5937	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5938	>	addToPendingCount(1);
5939		(rights = new MapReduceValuesToIntTask<K,V>
5940	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5940	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5941	>	rights, transformer, r, reducer)).fork();
5942		}
5943	<	int r = id;
5944	<	Object v;
6371	<	while ((v = advance()) != null)
6372	<	r = reducer.apply(r, transformer.apply((V)v));
5943	>	for (Node<K,V> p; (p = advance()) != null; )
5944	>	r = reducer.apply(r, transformer.apply(p.val));
5945		result = r;
5946	<	for (MapReduceValuesToIntTask<K,V> t = this, s;;) {
5947	<	int c; BulkTask<K,V,?> par;
5948	<	if ((c = t.pending) == 0) {
5949	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5950	<	t.result = reducer.apply(t.result, s.result);
5951	<	}
5952	<	if ((par = t.parent) == null ||
5953	<	!(par instanceof MapReduceValuesToIntTask)) {
6382	<	t.quietlyComplete();
6383	<	break;
6384	<	}
6385	<	t = (MapReduceValuesToIntTask<K,V>)par;
5946	>	CountedCompleter<?> c;
5947	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5948	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5949	>	t = (MapReduceValuesToIntTask<K,V>)c,
5950	>	s = t.rights;
5951	>	while (s != null) {
5952	>	t.result = reducer.apply(t.result, s.result);
5953	>	s = t.rights = s.nextRight;
5954		}
6387	–	else if (t.casPending(c, c - 1))
6388	–	break;
5955		}
6390	–	} catch (Throwable ex) {
6391	–	return tryCompleteComputation(ex);
5956		}
6393	–	return false;
5957		}
6395	–	public final Integer getRawResult() { return result; }
5958		}
5959
5960	<	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
5960	>	@SuppressWarnings("serial")
5961	>	static final class MapReduceEntriesToIntTask<K,V>
5962		extends BulkTask<K,V,Integer> {
5963		final ObjectToInt<Map.Entry<K,V>> transformer;
5964		final IntByIntToInt reducer;
#	Line 6403 | Line 5966 | public class ConcurrentHashMapV8<K, V>
5966		int result;
5967		MapReduceEntriesToIntTask<K,V> rights, nextRight;
5968		MapReduceEntriesToIntTask
5969	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
5969	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5970		MapReduceEntriesToIntTask<K,V> nextRight,
5971		ObjectToInt<Map.Entry<K,V>> transformer,
5972		int basis,
5973		IntByIntToInt reducer) {
5974	<	super(m, p, b); this.nextRight = nextRight;
5974	>	super(p, b, i, f, t); this.nextRight = nextRight;
5975		this.transformer = transformer;
5976		this.basis = basis; this.reducer = reducer;
5977		}
5978	<	@SuppressWarnings("unchecked") public final boolean exec() {
5979	<	final ObjectToInt<Map.Entry<K,V>> transformer =
5980	<	this.transformer;
5981	<	final IntByIntToInt reducer = this.reducer;
5982	<	if (transformer == null || reducer == null)
5983	<	return abortOnNullFunction();
5984	<	try {
5985	<	final int id = this.basis;
5986	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
5987	<	do {} while (!casPending(c = pending, c+1));
5978	>	public final Integer getRawResult() { return result; }
5979	>	public final void compute() {
5980	>	final ObjectToInt<Map.Entry<K,V>> transformer;
5981	>	final IntByIntToInt reducer;
5982	>	if ((transformer = this.transformer) != null &&
5983	>	(reducer = this.reducer) != null) {
5984	>	int r = this.basis;
5985	>	for (int i = baseIndex, f, h; batch > 0 &&
5986	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5987	>	addToPendingCount(1);
5988		(rights = new MapReduceEntriesToIntTask<K,V>
5989	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
5989	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5990	>	rights, transformer, r, reducer)).fork();
5991		}
5992	<	int r = id;
5993	<	Object v;
6430	<	while ((v = advance()) != null)
6431	<	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey, (V)v)));
5992	>	for (Node<K,V> p; (p = advance()) != null; )
5993	>	r = reducer.apply(r, transformer.apply(p));
5994		result = r;
5995	<	for (MapReduceEntriesToIntTask<K,V> t = this, s;;) {
5996	<	int c; BulkTask<K,V,?> par;
5997	<	if ((c = t.pending) == 0) {
5998	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
5999	<	t.result = reducer.apply(t.result, s.result);
6000	<	}
6001	<	if ((par = t.parent) == null ||
6002	<	!(par instanceof MapReduceEntriesToIntTask)) {
6441	<	t.quietlyComplete();
6442	<	break;
6443	<	}
6444	<	t = (MapReduceEntriesToIntTask<K,V>)par;
5995	>	CountedCompleter<?> c;
5996	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5997	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
5998	>	t = (MapReduceEntriesToIntTask<K,V>)c,
5999	>	s = t.rights;
6000	>	while (s != null) {
6001	>	t.result = reducer.apply(t.result, s.result);
6002	>	s = t.rights = s.nextRight;
6003		}
6446	–	else if (t.casPending(c, c - 1))
6447	–	break;
6004		}
6449	–	} catch (Throwable ex) {
6450	–	return tryCompleteComputation(ex);
6005		}
6452	–	return false;
6006		}
6454	–	public final Integer getRawResult() { return result; }
6007		}
6008
6009	<	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
6009	>	@SuppressWarnings("serial")
6010	>	static final class MapReduceMappingsToIntTask<K,V>
6011		extends BulkTask<K,V,Integer> {
6012		final ObjectByObjectToInt<? super K, ? super V> transformer;
6013		final IntByIntToInt reducer;
#	Line 6462 | Line 6015 | public class ConcurrentHashMapV8<K, V>
6015		int result;
6016		MapReduceMappingsToIntTask<K,V> rights, nextRight;
6017		MapReduceMappingsToIntTask
6018	<	(ConcurrentHashMapV8<K,V> m, BulkTask<K,V,?> p, int b,
6019	<	MapReduceMappingsToIntTask<K,V> rights,
6018	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6019	>	MapReduceMappingsToIntTask<K,V> nextRight,
6020		ObjectByObjectToInt<? super K, ? super V> transformer,
6021		int basis,
6022		IntByIntToInt reducer) {
6023	<	super(m, p, b); this.nextRight = nextRight;
6023	>	super(p, b, i, f, t); this.nextRight = nextRight;
6024		this.transformer = transformer;
6025		this.basis = basis; this.reducer = reducer;
6026		}
6027	<	@SuppressWarnings("unchecked") public final boolean exec() {
6028	<	final ObjectByObjectToInt<? super K, ? super V> transformer =
6029	<	this.transformer;
6030	<	final IntByIntToInt reducer = this.reducer;
6031	<	if (transformer == null || reducer == null)
6032	<	return abortOnNullFunction();
6033	<	try {
6034	<	final int id = this.basis;
6035	<	for (int c, b = batch(); b > 1 && baseIndex != baseLimit;) {
6036	<	do {} while (!casPending(c = pending, c+1));
6027	>	public final Integer getRawResult() { return result; }
6028	>	public final void compute() {
6029	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
6030	>	final IntByIntToInt reducer;
6031	>	if ((transformer = this.transformer) != null &&
6032	>	(reducer = this.reducer) != null) {
6033	>	int r = this.basis;
6034	>	for (int i = baseIndex, f, h; batch > 0 &&
6035	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6036	>	addToPendingCount(1);
6037		(rights = new MapReduceMappingsToIntTask<K,V>
6038	<	(map, this, b >>>= 1, rights, transformer, id, reducer)).fork();
6038	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6039	>	rights, transformer, r, reducer)).fork();
6040		}
6041	<	int r = id;
6042	<	Object v;
6489	<	while ((v = advance()) != null)
6490	<	r = reducer.apply(r, transformer.apply((K)nextKey, (V)v));
6041	>	for (Node<K,V> p; (p = advance()) != null; )
6042	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
6043		result = r;
6044	<	for (MapReduceMappingsToIntTask<K,V> t = this, s;;) {
6045	<	int c; BulkTask<K,V,?> par;
6046	<	if ((c = t.pending) == 0) {
6047	<	for (s = t.rights; s != null; s = t.rights = s.nextRight) {
6048	<	t.result = reducer.apply(t.result, s.result);
6044	>	CountedCompleter<?> c;
6045	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6046	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
6047	>	t = (MapReduceMappingsToIntTask<K,V>)c,
6048	>	s = t.rights;
6049	>	while (s != null) {
6050	>	t.result = reducer.apply(t.result, s.result);
6051	>	s = t.rights = s.nextRight;
6052	>	}
6053	>	}
6054	>	}
6055	>	}
6056	>	}
6057	>
6058	>	/* ---------------- Counters -------------- */
6059	>
6060	>	// Adapted from LongAdder and Striped64.
6061	>	// See their internal docs for explanation.
6062	>
6063	>	// A padded cell for distributing counts
6064	>	static final class CounterCell {
6065	>	volatile long p0, p1, p2, p3, p4, p5, p6;
6066	>	volatile long value;
6067	>	volatile long q0, q1, q2, q3, q4, q5, q6;
6068	>	CounterCell(long x) { value = x; }
6069	>	}
6070	>
6071	>	/**
6072	>	* Holder for the thread-local hash code determining which
6073	>	* CounterCell to use. The code is initialized via the
6074	>	* counterHashCodeGenerator, but may be moved upon collisions.
6075	>	*/
6076	>	static final class CounterHashCode {
6077	>	int code;
6078	>	}
6079	>
6080	>	/**
6081	>	* Generates initial value for per-thread CounterHashCodes.
6082	>	*/
6083	>	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
6084	>
6085	>	/**
6086	>	* Increment for counterHashCodeGenerator. See class ThreadLocal
6087	>	* for explanation.
6088	>	*/
6089	>	static final int SEED_INCREMENT = 0x61c88647;
6090	>
6091	>	/**
6092	>	* Per-thread counter hash codes. Shared across all instances.
6093	>	*/
6094	>	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
6095	>	new ThreadLocal<CounterHashCode>();
6096	>
6097	>
6098	>	final long sumCount() {
6099	>	CounterCell[] as = counterCells; CounterCell a;
6100	>	long sum = baseCount;
6101	>	if (as != null) {
6102	>	for (int i = 0; i < as.length; ++i) {
6103	>	if ((a = as[i]) != null)
6104	>	sum += a.value;
6105	>	}
6106	>	}
6107	>	return sum;
6108	>	}
6109	>
6110	>	// See LongAdder version for explanation
6111	>	private final void fullAddCount(long x, CounterHashCode hc,
6112	>	boolean wasUncontended) {
6113	>	int h;
6114	>	if (hc == null) {
6115	>	hc = new CounterHashCode();
6116	>	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
6117	>	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
6118	>	threadCounterHashCode.set(hc);
6119	>	}
6120	>	else
6121	>	h = hc.code;
6122	>	boolean collide = false;                // True if last slot nonempty
6123	>	for (;;) {
6124	>	CounterCell[] as; CounterCell a; int n; long v;
6125	>	if ((as = counterCells) != null && (n = as.length) > 0) {
6126	>	if ((a = as[(n - 1) & h]) == null) {
6127	>	if (cellsBusy == 0) {            // Try to attach new Cell
6128	>	CounterCell r = new CounterCell(x); // Optimistic create
6129	>	if (cellsBusy == 0 &&
6130	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6131	>	boolean created = false;
6132	>	try {               // Recheck under lock
6133	>	CounterCell[] rs; int m, j;
6134	>	if ((rs = counterCells) != null &&
6135	>	(m = rs.length) > 0 &&
6136	>	rs[j = (m - 1) & h] == null) {
6137	>	rs[j] = r;
6138	>	created = true;
6139	>	}
6140	>	} finally {
6141	>	cellsBusy = 0;
6142	>	}
6143	>	if (created)
6144	>	break;
6145	>	continue;           // Slot is now non-empty
6146		}
6147	<	if ((par = t.parent) == null ||
6148	<	!(par instanceof MapReduceMappingsToIntTask)) {
6149	<	t.quietlyComplete();
6150	<	break;
6147	>	}
6148	>	collide = false;
6149	>	}
6150	>	else if (!wasUncontended)       // CAS already known to fail
6151	>	wasUncontended = true;      // Continue after rehash
6152	>	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
6153	>	break;
6154	>	else if (counterCells != as || n >= NCPU)
6155	>	collide = false;            // At max size or stale
6156	>	else if (!collide)
6157	>	collide = true;
6158	>	else if (cellsBusy == 0 &&
6159	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6160	>	try {
6161	>	if (counterCells == as) {// Expand table unless stale
6162	>	CounterCell[] rs = new CounterCell[n << 1];
6163	>	for (int i = 0; i < n; ++i)
6164	>	rs[i] = as[i];
6165	>	counterCells = rs;
6166		}
6167	<	t = (MapReduceMappingsToIntTask<K,V>)par;
6167	>	} finally {
6168	>	cellsBusy = 0;
6169		}
6170	<	else if (t.casPending(c, c - 1))
6171	<	break;
6170	>	collide = false;
6171	>	continue;                   // Retry with expanded table
6172		}
6173	<	} catch (Throwable ex) {
6174	<	return tryCompleteComputation(ex);
6173	>	h ^= h << 13;                   // Rehash
6174	>	h ^= h >>> 17;
6175	>	h ^= h << 5;
6176	>	}
6177	>	else if (cellsBusy == 0 && counterCells == as &&
6178	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6179	>	boolean init = false;
6180	>	try {                           // Initialize table
6181	>	if (counterCells == as) {
6182	>	CounterCell[] rs = new CounterCell[2];
6183	>	rs[h & 1] = new CounterCell(x);
6184	>	counterCells = rs;
6185	>	init = true;
6186	>	}
6187	>	} finally {
6188	>	cellsBusy = 0;
6189	>	}
6190	>	if (init)
6191	>	break;
6192		}
6193	<	return false;
6193	>	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
6194	>	break;                          // Fall back on using base
6195		}
6196	<	public final Integer getRawResult() { return result; }
6196	>	hc.code = h;                            // Record index for next time
6197		}
6198
6516	–
6199		// Unsafe mechanics
6200	<	private static final sun.misc.Unsafe UNSAFE;
6201	<	private static final long counterOffset;
6202	<	private static final long sizeCtlOffset;
6200	>	private static final sun.misc.Unsafe U;
6201	>	private static final long SIZECTL;
6202	>	private static final long TRANSFERINDEX;
6203	>	private static final long BASECOUNT;
6204	>	private static final long CELLSBUSY;
6205	>	private static final long CELLVALUE;
6206		private static final long ABASE;
6207		private static final int ASHIFT;
6208
6209		static {
6525	–	int ss;
6210		try {
6211	<	UNSAFE = getUnsafe();
6211	>	U = getUnsafe();
6212		Class<?> k = ConcurrentHashMapV8.class;
6213	<	counterOffset = UNSAFE.objectFieldOffset
6530	<	(k.getDeclaredField("counter"));
6531	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6213	>	SIZECTL = U.objectFieldOffset
6214		(k.getDeclaredField("sizeCtl"));
6215	<	Class<?> sc = Node[].class;
6216	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6217	<	ss = UNSAFE.arrayIndexScale(sc);
6215	>	TRANSFERINDEX = U.objectFieldOffset
6216	>	(k.getDeclaredField("transferIndex"));
6217	>	BASECOUNT = U.objectFieldOffset
6218	>	(k.getDeclaredField("baseCount"));
6219	>	CELLSBUSY = U.objectFieldOffset
6220	>	(k.getDeclaredField("cellsBusy"));
6221	>	Class<?> ck = CounterCell.class;
6222	>	CELLVALUE = U.objectFieldOffset
6223	>	(ck.getDeclaredField("value"));
6224	>	Class<?> ak = Node[].class;
6225	>	ABASE = U.arrayBaseOffset(ak);
6226	>	int scale = U.arrayIndexScale(ak);
6227	>	if ((scale & (scale - 1)) != 0)
6228	>	throw new Error("data type scale not a power of two");
6229	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6230		} catch (Exception e) {
6231		throw new Error(e);
6232		}
6539	–	if ((ss & (ss-1)) != 0)
6540	–	throw new Error("data type scale not a power of two");
6541	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6233		}
6234
6235		/**
#	Line 6551 | Line 6242 | public class ConcurrentHashMapV8<K, V>
6242		private static sun.misc.Unsafe getUnsafe() {
6243		try {
6244		return sun.misc.Unsafe.getUnsafe();
6245	<	} catch (SecurityException se) {
6246	<	try {
6247	<	return java.security.AccessController.doPrivileged
6248	<	(new java.security
6249	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6250	<	public sun.misc.Unsafe run() throws Exception {
6251	<	java.lang.reflect.Field f = sun.misc
6252	<	.Unsafe.class.getDeclaredField("theUnsafe");
6253	<	f.setAccessible(true);
6254	<	return (sun.misc.Unsafe) f.get(null);
6255	<	}});
6256	<	} catch (java.security.PrivilegedActionException e) {
6257	<	throw new RuntimeException("Could not initialize intrinsics",
6258	<	e.getCause());
6259	<	}
6245	>	} catch (SecurityException tryReflectionInstead) {}
6246	>	try {
6247	>	return java.security.AccessController.doPrivileged
6248	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6249	>	public sun.misc.Unsafe run() throws Exception {
6250	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6251	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6252	>	f.setAccessible(true);
6253	>	Object x = f.get(null);
6254	>	if (k.isInstance(x))
6255	>	return k.cast(x);
6256	>	}
6257	>	throw new NoSuchFieldError("the Unsafe");
6258	>	}});
6259	>	} catch (java.security.PrivilegedActionException e) {
6260	>	throw new RuntimeException("Could not initialize intrinsics",
6261	>	e.getCause());
6262		}
6263		}
6264		}

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