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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.43 by jsr166, Wed Jul 4 20:21:02 2012 UTC vs.
Revision 1.87 by jsr166, Wed Jan 9 02:51:36 2013 UTC

#	Line 5 | Line 5
5		*/
6
7		package jsr166e;
8	<	import jsr166e.LongAdder;
8	>
9	>	import java.util.Comparator;
10		import java.util.Arrays;
11		import java.util.Map;
12		import java.util.Set;
#	Line 20 | Line 21 | import java.util.Enumeration;
21		import java.util.ConcurrentModificationException;
22		import java.util.NoSuchElementException;
23		import java.util.concurrent.ConcurrentMap;
23	–	import java.util.concurrent.ThreadLocalRandom;
24	–	import java.util.concurrent.locks.LockSupport;
24		import java.util.concurrent.locks.AbstractQueuedSynchronizer;
25	+	import java.util.concurrent.atomic.AtomicInteger;
26	+	import java.util.concurrent.atomic.AtomicReference;
27		import java.io.Serializable;
28
29		/**
#	Line 37 | Line 38 | import java.io.Serializable;
38		* interoperable with {@code Hashtable} in programs that rely on its
39		* thread safety but not on its synchronization details.
40		*
41	<	* <p> Retrieval operations (including {@code get}) generally do not
41	>	* <p>Retrieval operations (including {@code get}) generally do not
42		* block, so may overlap with update operations (including {@code put}
43		* and {@code remove}). Retrievals reflect the results of the most
44		* recently <em>completed</em> update operations holding upon their
45	<	* onset.  For aggregate operations such as {@code putAll} and {@code
46	<	* clear}, concurrent retrievals may reflect insertion or removal of
47	<	* only some entries.  Similarly, Iterators and Enumerations return
48	<	* elements reflecting the state of the hash table at some point at or
49	<	* since the creation of the iterator/enumeration.  They do
50	<	* <em>not</em> throw {@link ConcurrentModificationException}.
51	<	* However, iterators are designed to be used by only one thread at a
52	<	* time.  Bear in mind that the results of aggregate status methods
53	<	* including {@code size}, {@code isEmpty}, and {@code containsValue}
54	<	* are typically useful only when a map is not undergoing concurrent
55	<	* updates in other threads.  Otherwise the results of these methods
56	<	* reflect transient states that may be adequate for monitoring
57	<	* or estimation purposes, but not for program control.
45	>	* onset. (More formally, an update operation for a given key bears a
46	>	* <em>happens-before</em> relation with any (non-null) retrieval for
47	>	* that key reporting the updated value.)  For aggregate operations
48	>	* such as {@code putAll} and {@code clear}, concurrent retrievals may
49	>	* reflect insertion or removal of only some entries.  Similarly,
50	>	* Iterators and Enumerations return elements reflecting the state of
51	>	* the hash table at some point at or since the creation of the
52	>	* iterator/enumeration.  They do <em>not</em> throw {@link
53	>	* ConcurrentModificationException}.  However, iterators are designed
54	>	* to be used by only one thread at a time.  Bear in mind that the
55	>	* results of aggregate status methods including {@code size}, {@code
56	>	* isEmpty}, and {@code containsValue} are typically useful only when
57	>	* a map is not undergoing concurrent updates in other threads.
58	>	* Otherwise the results of these methods reflect transient states
59	>	* that may be adequate for monitoring or estimation purposes, but not
60	>	* for program control.
61		*
62	<	* <p> The table is dynamically expanded when there are too many
62	>	* <p>The table is dynamically expanded when there are too many
63		* collisions (i.e., keys that have distinct hash codes but fall into
64		* the same slot modulo the table size), with the expected average
65		* effect of maintaining roughly two bins per mapping (corresponding
#	Line 76 | Line 80 | import java.io.Serializable;
80		* {@code hashCode()} is a sure way to slow down performance of any
81		* hash table.
82		*
83	+	* <p>A {@link Set} projection of a ConcurrentHashMapV8 may be created
84	+	* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
85	+	* (using {@link #keySet(Object)} when only keys are of interest, and the
86	+	* mapped values are (perhaps transiently) not used or all take the
87	+	* same mapping value.
88	+	*
89	+	* <p>A ConcurrentHashMapV8 can be used as scalable frequency map (a
90	+	* form of histogram or multiset) by using {@link LongAdder} values
91	+	* and initializing via {@link #computeIfAbsent}. For example, to add
92	+	* a count to a {@code ConcurrentHashMapV8<String,LongAdder> freqs}, you
93	+	* can use {@code freqs.computeIfAbsent(k -> new
94	+	* LongAdder()).increment();}
95	+	*
96		* <p>This class and its views and iterators implement all of the
97		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
98		* interfaces.
99		*
100	<	* <p> Like {@link Hashtable} but unlike {@link HashMap}, this class
100	>	* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
101		* does <em>not</em> allow {@code null} to be used as a key or value.
102		*
103	+	* <p>ConcurrentHashMapV8s support sequential and parallel operations
104	+	* bulk operations. (Parallel forms use the {@link
105	+	* ForkJoinPool#commonPool()}). Tasks that may be used in other
106	+	* contexts are available in class {@link ForkJoinTasks}. These
107	+	* operations are designed to be safely, and often sensibly, applied
108	+	* even with maps that are being concurrently updated by other
109	+	* threads; for example, when computing a snapshot summary of the
110	+	* values in a shared registry.  There are three kinds of operation,
111	+	* each with four forms, accepting functions with Keys, Values,
112	+	* Entries, and (Key, Value) arguments and/or return values. Because
113	+	* the elements of a ConcurrentHashMapV8 are not ordered in any
114	+	* particular way, and may be processed in different orders in
115	+	* different parallel executions, the correctness of supplied
116	+	* functions should not depend on any ordering, or on any other
117	+	* objects or values that may transiently change while computation is
118	+	* in progress; and except for forEach actions, should ideally be
119	+	* side-effect-free.
120	+	*
121	+	* <ul>
122	+	* <li> forEach: Perform a given action on each element.
123	+	* A variant form applies a given transformation on each element
124	+	* before performing the action.</li>
125	+	*
126	+	* <li> search: Return the first available non-null result of
127	+	* applying a given function on each element; skipping further
128	+	* search when a result is found.</li>
129	+	*
130	+	* <li> reduce: Accumulate each element.  The supplied reduction
131	+	* function cannot rely on ordering (more formally, it should be
132	+	* both associative and commutative).  There are five variants:
133	+	*
134	+	* <ul>
135	+	*
136	+	* <li> Plain reductions. (There is not a form of this method for
137	+	* (key, value) function arguments since there is no corresponding
138	+	* return type.)</li>
139	+	*
140	+	* <li> Mapped reductions that accumulate the results of a given
141	+	* function applied to each element.</li>
142	+	*
143	+	* <li> Reductions to scalar doubles, longs, and ints, using a
144	+	* given basis value.</li>
145	+	*
146	+	* </li>
147	+	* </ul>
148	+	* </ul>
149	+	*
150	+	* <p>The concurrency properties of bulk operations follow
151	+	* from those of ConcurrentHashMapV8: Any non-null result returned
152	+	* from {@code get(key)} and related access methods bears a
153	+	* happens-before relation with the associated insertion or
154	+	* update.  The result of any bulk operation reflects the
155	+	* composition of these per-element relations (but is not
156	+	* necessarily atomic with respect to the map as a whole unless it
157	+	* is somehow known to be quiescent).  Conversely, because keys
158	+	* and values in the map are never null, null serves as a reliable
159	+	* atomic indicator of the current lack of any result.  To
160	+	* maintain this property, null serves as an implicit basis for
161	+	* all non-scalar reduction operations. For the double, long, and
162	+	* int versions, the basis should be one that, when combined with
163	+	* any other value, returns that other value (more formally, it
164	+	* should be the identity element for the reduction). Most common
165	+	* reductions have these properties; for example, computing a sum
166	+	* with basis 0 or a minimum with basis MAX_VALUE.
167	+	*
168	+	* <p>Search and transformation functions provided as arguments
169	+	* should similarly return null to indicate the lack of any result
170	+	* (in which case it is not used). In the case of mapped
171	+	* reductions, this also enables transformations to serve as
172	+	* filters, returning null (or, in the case of primitive
173	+	* specializations, the identity basis) if the element should not
174	+	* be combined. You can create compound transformations and
175	+	* filterings by composing them yourself under this "null means
176	+	* there is nothing there now" rule before using them in search or
177	+	* reduce operations.
178	+	*
179	+	* <p>Methods accepting and/or returning Entry arguments maintain
180	+	* key-value associations. They may be useful for example when
181	+	* finding the key for the greatest value. Note that "plain" Entry
182	+	* arguments can be supplied using {@code new
183	+	* AbstractMap.SimpleEntry(k,v)}.
184	+	*
185	+	* <p>Bulk operations may complete abruptly, throwing an
186	+	* exception encountered in the application of a supplied
187	+	* function. Bear in mind when handling such exceptions that other
188	+	* concurrently executing functions could also have thrown
189	+	* exceptions, or would have done so if the first exception had
190	+	* not occurred.
191	+	*
192	+	* <p>Speedups for parallel compared to sequential forms are common
193	+	* but not guaranteed.  Parallel operations involving brief functions
194	+	* on small maps may execute more slowly than sequential forms if the
195	+	* underlying work to parallelize the computation is more expensive
196	+	* than the computation itself.  Similarly, parallelization may not
197	+	* lead to much actual parallelism if all processors are busy
198	+	* performing unrelated tasks.
199	+	*
200	+	* <p>All arguments to all task methods must be non-null.
201	+	*
202	+	* <p><em>jsr166e note: During transition, this class
203	+	* uses nested functional interfaces with different names but the
204	+	* same forms as those expected for JDK8.</em>
205	+	*
206		* <p>This class is a member of the
207		* <a href="{@docRoot}/../technotes/guides/collections/index.html">
208		* Java Collections Framework</a>.
209		*
90	–	* <p><em>jsr166e note: This class is a candidate replacement for
91	–	* java.util.concurrent.ConcurrentHashMap.<em>
92	–	*
210		* @since 1.5
211		* @author Doug Lea
212		* @param <K> the type of keys maintained by this map
213		* @param <V> the type of mapped values
214		*/
215		public class ConcurrentHashMapV8<K, V>
216	<	implements ConcurrentMap<K, V>, Serializable {
216	>	implements ConcurrentMap<K, V>, Serializable {
217		private static final long serialVersionUID = 7249069246763182397L;
218
219		/**
103	–	* A function computing a mapping from the given key to a value.
104	–	* This is a place-holder for an upcoming JDK8 interface.
105	–	*/
106	–	public static interface MappingFunction<K, V> {
107	–	/**
108	–	* Returns a value for the given key, or null if there is no mapping.
109	–	*
110	–	* @param key the (non-null) key
111	–	* @return a value for the key, or null if none
112	–	*/
113	–	V map(K key);
114	–	}
115	–
116	–	/**
117	–	* A function computing a new mapping given a key and its current
118	–	* mapped value (or {@code null} if there is no current
119	–	* mapping). This is a place-holder for an upcoming JDK8
120	–	* interface.
121	–	*/
122	–	public static interface RemappingFunction<K, V> {
123	–	/**
124	–	* Returns a new value given a key and its current value.
125	–	*
126	–	* @param key the (non-null) key
127	–	* @param value the current value, or null if there is no mapping
128	–	* @return a value for the key, or null if none
129	–	*/
130	–	V remap(K key, V value);
131	–	}
132	–
133	–	/**
220		* A partitionable iterator. A Spliterator can be traversed
221		* directly, but can also be partitioned (before traversal) by
222		* creating another Spliterator that covers a non-overlapping
223		* portion of the elements, and so may be amenable to parallel
224		* execution.
225		*
226	<	* <p> This interface exports a subset of expected JDK8
226	>	* <p>This interface exports a subset of expected JDK8
227		* functionality.
228		*
229		* <p>Sample usage: Here is one (of the several) ways to compute
#	Line 145 | Line 231 | public class ConcurrentHashMapV8<K, V>
231		* framework. As illustrated here, Spliterators are well suited to
232		* designs in which a task repeatedly splits off half its work
233		* into forked subtasks until small enough to process directly,
234	<	* and then joins these subtasks. Variants of this style can be
235	<	* also be used in completion-based designs.
234	>	* and then joins these subtasks. Variants of this style can also
235	>	* be used in completion-based designs.
236		*
237		* <pre>
238		* {@code ConcurrentHashMapV8<String, Long> m = ...
239	<	* // Uses parallel depth of log2 of size / (parallelism * slack of 8).
240	<	* int depth = 32 - Integer.numberOfLeadingZeros(m.size() / (aForkJoinPool.getParallelism() * 8));
241	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), depth, null));
239	>	* // split as if have 8 * parallelism, for load balance
240	>	* int n = m.size();
241	>	* int p = aForkJoinPool.getParallelism() * 8;
242	>	* int split = (n < p)? n : p;
243	>	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
244		* // ...
245		* static class SumValues extends RecursiveTask<Long> {
246		*   final Spliterator<Long> s;
247	<	*   final int depth;             // number of splits before processing
247	>	*   final int split;             // split while > 1
248		*   final SumValues nextJoin;    // records forked subtasks to join
249		*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
250		*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
#	Line 164 | Line 252 | public class ConcurrentHashMapV8<K, V>
252		*   public Long compute() {
253		*     long sum = 0;
254		*     SumValues subtasks = null; // fork subtasks
255	<	*     for (int d = depth - 1; d >= 0; --d)
256	<	*       (subtasks = new SumValues(s.split(), d, subtasks)).fork();
255	>	*     for (int s = split >>> 1; s > 0; s >>>= 1)
256	>	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
257		*     while (s.hasNext())        // directly process remaining elements
258		*       sum += s.next();
259		*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
#	Line 192 | Line 280 | public class ConcurrentHashMapV8<K, V>
280		* @return a Spliterator covering approximately half of the
281		* elements
282		* @throws IllegalStateException if this Spliterator has
283	<	* already commenced traversing elements.
283	>	* already commenced traversing elements
284		*/
285		Spliterator<T> split();
198	–
199	–	/**
200	–	* Returns a Spliterator producing the same elements as this
201	–	* Spliterator. This method may be used for example to create
202	–	* a second Spliterator before a traversal, in order to later
203	–	* perform a second traversal.
204	–	*
205	–	* @return a Spliterator covering the same range as this Spliterator.
206	–	* @throws IllegalStateException if this Spliterator has
207	–	* already commenced traversing elements.
208	–	*/
209	–	Spliterator<T> clone();
286		}
287
288		/*
#	Line 219 | Line 295 | public class ConcurrentHashMapV8<K, V>
295		* the same or better than java.util.HashMap, and to support high
296		* initial insertion rates on an empty table by many threads.
297		*
298	<	* Each key-value mapping is held in a Node.  Because Node fields
299	<	* can contain special values, they are defined using plain Object
300	<	* types. Similarly in turn, all internal methods that use them
301	<	* work off Object types. And similarly, so do the internal
302	<	* methods of auxiliary iterator and view classes.  All public
303	<	* generic typed methods relay in/out of these internal methods,
304	<	* supplying null-checks and casts as needed. This also allows
305	<	* many of the public methods to be factored into a smaller number
306	<	* of internal methods (although sadly not so for the five
231	<	* variants of put-related operations). The validation-based
232	<	* approach explained below leads to a lot of code sprawl because
298	>	* Each key-value mapping is held in a Node.  Because Node key
299	>	* fields can contain special values, they are defined using plain
300	>	* Object types (not type "K"). This leads to a lot of explicit
301	>	* casting (and many explicit warning suppressions to tell
302	>	* compilers not to complain about it). It also allows some of the
303	>	* public methods to be factored into a smaller number of internal
304	>	* methods (although sadly not so for the five variants of
305	>	* put-related operations). The validation-based approach
306	>	* explained below leads to a lot of code sprawl because
307		* retry-control precludes factoring into smaller methods.
308		*
309		* The table is lazily initialized to a power-of-two size upon the
#	Line 243 | Line 317 | public class ConcurrentHashMapV8<K, V>
317		* as lookups check hash code and non-nullness of value before
318		* checking key equality.
319		*
320	<	* We use the top two bits of Node hash fields for control
321	<	* purposes -- they are available anyway because of addressing
322	<	* constraints.  As explained further below, these top bits are
323	<	* used as follows:
324	<	*  00 - Normal
325	<	*  01 - Locked
252	<	*  11 - Locked and may have a thread waiting for lock
253	<	*  10 - Node is a forwarding node
254	<	*
255	<	* The lower 30 bits of each Node's hash field contain a
256	<	* transformation of the key's hash code, except for forwarding
257	<	* nodes, for which the lower bits are zero (and so always have
258	<	* hash field == MOVED).
320	>	* We use the top (sign) bit of Node hash fields for control
321	>	* purposes -- it is available anyway because of addressing
322	>	* constraints.  Nodes with negative hash fields are forwarding
323	>	* nodes to either TreeBins or resized tables.  The lower 31 bits
324	>	* of each normal Node's hash field contain a transformation of
325	>	* the key's hash code.
326		*
327		* Insertion (via put or its variants) of the first node in an
328		* empty bin is performed by just CASing it to the bin.  This is
#	Line 264 | Line 331 | public class ConcurrentHashMapV8<K, V>
331		* delete, and replace) require locks.  We do not want to waste
332		* the space required to associate a distinct lock object with
333		* each bin, so instead use the first node of a bin list itself as
334	<	* a lock. Blocking support for these locks relies on the builtin
335	<	* "synchronized" monitors.  However, we also need a tryLock
269	<	* construction, so we overlay these by using bits of the Node
270	<	* hash field for lock control (see above), and so normally use
271	<	* builtin monitors only for blocking and signalling using
272	<	* wait/notifyAll constructions. See Node.tryAwaitLock.
334	>	* a lock. Locking support for these locks relies on builtin
335	>	* "synchronized" monitors.
336		*
337		* Using the first node of a list as a lock does not by itself
338		* suffice though: When a node is locked, any update must first
#	Line 331 | Line 394 | public class ConcurrentHashMapV8<K, V>
394		* iterators in the same way.
395		*
396		* The table is resized when occupancy exceeds a percentage
397	<	* threshold (nominally, 0.75, but see below).  Only a single
398	<	* thread performs the resize (using field "sizeCtl", to arrange
399	<	* exclusion), but the table otherwise remains usable for reads
400	<	* and updates. Resizing proceeds by transferring bins, one by
401	<	* one, from the table to the next table.  Because we are using
402	<	* power-of-two expansion, the elements from each bin must either
403	<	* stay at same index, or move with a power of two offset. We
404	<	* eliminate unnecessary node creation by catching cases where old
405	<	* nodes can be reused because their next fields won't change.  On
406	<	* average, only about one-sixth of them need cloning when a table
407	<	* doubles. The nodes they replace will be garbage collectable as
408	<	* soon as they are no longer referenced by any reader thread that
409	<	* may be in the midst of concurrently traversing table.  Upon
410	<	* transfer, the old table bin contains only a special forwarding
411	<	* node (with hash field "MOVED") that contains the next table as
412	<	* its key. On encountering a forwarding node, access and update
413	<	* operations restart, using the new table.
414	<	*
415	<	* Each bin transfer requires its bin lock. However, unlike other
416	<	* cases, a transfer can skip a bin if it fails to acquire its
417	<	* lock, and revisit it later (unless it is a TreeBin). Method
418	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
419	<	* have been skipped because of failure to acquire a lock, and
420	<	* blocks only if none are available (i.e., only very rarely).
421	<	* The transfer operation must also ensure that all accessible
422	<	* bins in both the old and new table are usable by any traversal.
423	<	* When there are no lock acquisition failures, this is arranged
424	<	* simply by proceeding from the last bin (table.length - 1) up
425	<	* towards the first.  Upon seeing a forwarding node, traversals
426	<	* (see class InternalIterator) arrange to move to the new table
427	<	* without revisiting nodes.  However, when any node is skipped
428	<	* during a transfer, all earlier table bins may have become
429	<	* visible, so are initialized with a reverse-forwarding node back
430	<	* to the old table until the new ones are established. (This
431	<	* sometimes requires transiently locking a forwarding node, which
432	<	* is possible under the above encoding.) These more expensive
433	<	* mechanics trigger only when necessary.
397	>	* threshold (nominally, 0.75, but see below).  Any thread
398	>	* noticing an overfull bin may assist in resizing after the
399	>	* initiating thread allocates and sets up the replacement
400	>	* array. However, rather than stalling, these other threads may
401	>	* proceed with insertions etc.  The use of TreeBins shields us
402	>	* from the worst case effects of overfilling while resizes are in
403	>	* progress.  Resizing proceeds by transferring bins, one by one,
404	>	* from the table to the next table. To enable concurrency, the
405	>	* next table must be (incrementally) prefilled with place-holders
406	>	* serving as reverse forwarders to the old table.  Because we are
407	>	* using power-of-two expansion, the elements from each bin must
408	>	* either stay at same index, or move with a power of two
409	>	* offset. We eliminate unnecessary node creation by catching
410	>	* cases where old nodes can be reused because their next fields
411	>	* won't change.  On average, only about one-sixth of them need
412	>	* cloning when a table doubles. The nodes they replace will be
413	>	* garbage collectable as soon as they are no longer referenced by
414	>	* any reader thread that may be in the midst of concurrently
415	>	* traversing table.  Upon transfer, the old table bin contains
416	>	* only a special forwarding node (with hash field "MOVED") that
417	>	* contains the next table as its key. On encountering a
418	>	* forwarding node, access and update operations restart, using
419	>	* the new table.
420	>	*
421	>	* Each bin transfer requires its bin lock, which can stall
422	>	* waiting for locks while resizing. However, because other
423	>	* threads can join in and help resize rather than contend for
424	>	* locks, average aggregate waits become shorter as resizing
425	>	* progresses.  The transfer operation must also ensure that all
426	>	* accessible bins in both the old and new table are usable by any
427	>	* traversal.  This is arranged by proceeding from the last bin
428	>	* (table.length - 1) up towards the first.  Upon seeing a
429	>	* forwarding node, traversals (see class Traverser) arrange to
430	>	* move to the new table without revisiting nodes.  However, to
431	>	* ensure that no intervening nodes are skipped, bin splitting can
432	>	* only begin after the associated reverse-forwarders are in
433	>	* place.
434		*
435		* The traversal scheme also applies to partial traversals of
436	<	* ranges of bins (via an alternate InternalIterator constructor)
436	>	* ranges of bins (via an alternate Traverser constructor)
437		* to support partitioned aggregate operations.  Also, read-only
438		* operations give up if ever forwarded to a null table, which
439		* provides support for shutdown-style clearing, which is also not
#	Line 382 | Line 445 | public class ConcurrentHashMapV8<K, V>
445		* These cases attempt to override the initial capacity settings,
446		* but harmlessly fail to take effect in cases of races.
447		*
448	<	* The element count is maintained using a LongAdder, which avoids
449	<	* contention on updates but can encounter cache thrashing if read
450	<	* too frequently during concurrent access. To avoid reading so
451	<	* often, resizing is attempted either when a bin lock is
452	<	* contended, or upon adding to a bin already holding two or more
453	<	* nodes (checked before adding in the xIfAbsent methods, after
454	<	* adding in others). Under uniform hash distributions, the
455	<	* probability of this occurring at threshold is around 13%,
456	<	* meaning that only about 1 in 8 puts check threshold (and after
457	<	* resizing, many fewer do so). But this approximation has high
458	<	* variance for small table sizes, so we check on any collision
459	<	* for sizes <= 64. The bulk putAll operation further reduces
460	<	* contention by only committing count updates upon these size
461	<	* checks.
448	>	* The element count is maintained using a specialization of
449	>	* LongAdder. We need to incorporate a specialization rather than
450	>	* just use a LongAdder in order to access implicit
451	>	* contention-sensing that leads to creation of multiple
452	>	* CounterCells.  The counter mechanics avoid contention on
453	>	* updates but can encounter cache thrashing if read too
454	>	* frequently during concurrent access. To avoid reading so often,
455	>	* resizing under contention is attempted only upon adding to a
456	>	* bin already holding two or more nodes. Under uniform hash
457	>	* distributions, the probability of this occurring at threshold
458	>	* is around 13%, meaning that only about 1 in 8 puts check
459	>	* threshold (and after resizing, many fewer do so). The bulk
460	>	* putAll operation further reduces contention by only committing
461	>	* count updates upon these size checks.
462		*
463		* Maintaining API and serialization compatibility with previous
464		* versions of this class introduces several oddities. Mainly: We
#	Line 446 | Line 509 | public class ConcurrentHashMapV8<K, V>
509		private static final float LOAD_FACTOR = 0.75f;
510
511		/**
449	–	* The buffer size for skipped bins during transfers. The
450	–	* value is arbitrary but should be large enough to avoid
451	–	* most locking stalls during resizes.
452	–	*/
453	–	private static final int TRANSFER_BUFFER_SIZE = 32;
454	–
455	–	/**
512		* The bin count threshold for using a tree rather than list for a
513		* bin.  The value reflects the approximate break-even point for
514		* using tree-based operations.
515		*/
516		private static final int TREE_THRESHOLD = 8;
517
518	+	/**
519	+	* Minimum number of rebinnings per transfer step. Ranges are
520	+	* subdivided to allow multiple resizer threads.  This value
521	+	* serves as a lower bound to avoid resizers encountering
522	+	* excessive memory contention.  The value should be at least
523	+	* DEFAULT_CAPACITY.
524	+	*/
525	+	private static final int MIN_TRANSFER_STRIDE = 16;
526	+
527		/*
528	<	* Encodings for special uses of Node hash fields. See above for
464	<	* explanation.
528	>	* Encodings for Node hash fields. See above for explanation.
529		*/
530		static final int MOVED     = 0x80000000; // hash field for forwarding nodes
531	<	static final int LOCKED    = 0x40000000; // set/tested only as a bit
532	<	static final int WAITING   = 0xc0000000; // both bits set/tested together
533	<	static final int HASH_BITS = 0x3fffffff; // usable bits of normal node hash
531	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
532	>
533	>	/** Number of CPUS, to place bounds on some sizings */
534	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
535	>
536	>	/* ---------------- Counters -------------- */
537	>
538	>	// Adapted from LongAdder and Striped64.
539	>	// See their internal docs for explanation.
540	>
541	>	// A padded cell for distributing counts
542	>	static final class CounterCell {
543	>	volatile long p0, p1, p2, p3, p4, p5, p6;
544	>	volatile long value;
545	>	volatile long q0, q1, q2, q3, q4, q5, q6;
546	>	CounterCell(long x) { value = x; }
547	>	}
548	>
549	>	/**
550	>	* Holder for the thread-local hash code determining which
551	>	* CounterCell to use. The code is initialized via the
552	>	* counterHashCodeGenerator, but may be moved upon collisions.
553	>	*/
554	>	static final class CounterHashCode {
555	>	int code;
556	>	}
557	>
558	>	/**
559	>	* Generates initial value for per-thread CounterHashCodes
560	>	*/
561	>	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
562	>
563	>	/**
564	>	* Increment for counterHashCodeGenerator. See class ThreadLocal
565	>	* for explanation.
566	>	*/
567	>	static final int SEED_INCREMENT = 0x61c88647;
568	>
569	>	/**
570	>	* Per-thread counter hash codes. Shared across all instances.
571	>	*/
572	>	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
573	>	new ThreadLocal<CounterHashCode>();
574
575		/* ---------------- Fields -------------- */
576
#	Line 474 | Line 578 | public class ConcurrentHashMapV8<K, V>
578		* The array of bins. Lazily initialized upon first insertion.
579		* Size is always a power of two. Accessed directly by iterators.
580		*/
581	<	transient volatile Node[] table;
581	>	transient volatile Node<V>[] table;
582	>
583	>	/**
584	>	* The next table to use; non-null only while resizing.
585	>	*/
586	>	private transient volatile Node<V>[] nextTable;
587
588		/**
589	<	* The counter maintaining number of elements.
589	>	* Base counter value, used mainly when there is no contention,
590	>	* but also as a fallback during table initialization
591	>	* races. Updated via CAS.
592		*/
593	<	private transient final LongAdder counter;
593	>	private transient volatile long baseCount;
594
595		/**
596		* Table initialization and resizing control.  When negative, the
597	<	* table is being initialized or resized. Otherwise, when table is
598	<	* null, holds the initial table size to use upon creation, or 0
599	<	* for default. After initialization, holds the next element count
600	<	* value upon which to resize the table.
597	>	* table is being initialized or resized: -1 for initialization,
598	>	* else -(1 + the number of active resizing threads).  Otherwise,
599	>	* when table is null, holds the initial table size to use upon
600	>	* creation, or 0 for default. After initialization, holds the
601	>	* next element count value upon which to resize the table.
602		*/
603		private transient volatile int sizeCtl;
604
605	+	/**
606	+	* The next table index (plus one) to split while resizing.
607	+	*/
608	+	private transient volatile int transferIndex;
609	+
610	+	/**
611	+	* The least available table index to split while resizing.
612	+	*/
613	+	private transient volatile int transferOrigin;
614	+
615	+	/**
616	+	* Spinlock (locked via CAS) used when resizing and/or creating Cells.
617	+	*/
618	+	private transient volatile int counterBusy;
619	+
620	+	/**
621	+	* Table of counter cells. When non-null, size is a power of 2.
622	+	*/
623	+	private transient volatile CounterCell[] counterCells;
624	+
625		// views
626	<	private transient KeySet<K,V> keySet;
627	<	private transient Values<K,V> values;
628	<	private transient EntrySet<K,V> entrySet;
626	>	private transient KeySetView<K,V> keySet;
627	>	private transient ValuesView<K,V> values;
628	>	private transient EntrySetView<K,V> entrySet;
629
630		/** For serialization compatibility. Null unless serialized; see below */
631		private Segment<K,V>[] segments;
#	Line 512 | Line 644 | public class ConcurrentHashMapV8<K, V>
644		* inline assignments below.
645		*/
646
647	<	static final Node tabAt(Node[] tab, int i) { // used by InternalIterator
648	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
647	>	@SuppressWarnings("unchecked") static final <V> Node<V> tabAt
648	>	(Node<V>[] tab, int i) { // used by Traverser
649	>	return (Node<V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
650		}
651
652	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
653	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
652	>	private static final <V> boolean casTabAt
653	>	(Node<V>[] tab, int i, Node<V> c, Node<V> v) {
654	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
655		}
656
657	<	private static final void setTabAt(Node[] tab, int i, Node v) {
658	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
657	>	private static final <V> void setTabAt
658	>	(Node<V>[] tab, int i, Node<V> v) {
659	>	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
660		}
661
662		/* ---------------- Nodes -------------- */
#	Line 536 | Line 671 | public class ConcurrentHashMapV8<K, V>
671		* before a val, but can only be used after checking val to be
672		* non-null.
673		*/
674	<	static class Node {
675	<	volatile int hash;
674	>	static class Node<V> {
675	>	final int hash;
676		final Object key;
677	<	volatile Object val;
678	<	volatile Node next;
677	>	volatile V val;
678	>	volatile Node<V> next;
679
680	<	Node(int hash, Object key, Object val, Node next) {
680	>	Node(int hash, Object key, V val, Node<V> next) {
681		this.hash = hash;
682		this.key = key;
683		this.val = val;
684		this.next = next;
685		}
551	–
552	–	/** CompareAndSet the hash field */
553	–	final boolean casHash(int cmp, int val) {
554	–	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
555	–	}
556	–
557	–	/** The number of spins before blocking for a lock */
558	–	static final int MAX_SPINS =
559	–	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
560	–
561	–	/**
562	–	* Spins a while if LOCKED bit set and this node is the first
563	–	* of its bin, and then sets WAITING bits on hash field and
564	–	* blocks (once) if they are still set.  It is OK for this
565	–	* method to return even if lock is not available upon exit,
566	–	* which enables these simple single-wait mechanics.
567	–	*
568	–	* The corresponding signalling operation is performed within
569	–	* callers: Upon detecting that WAITING has been set when
570	–	* unlocking lock (via a failed CAS from non-waiting LOCKED
571	–	* state), unlockers acquire the sync lock and perform a
572	–	* notifyAll.
573	–	*/
574	–	final void tryAwaitLock(Node[] tab, int i) {
575	–	if (tab != null && i >= 0 && i < tab.length) { // bounds check
576	–	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
577	–	int spins = MAX_SPINS, h;
578	–	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
579	–	if (spins >= 0) {
580	–	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
581	–	if (r >= 0 && --spins == 0)
582	–	Thread.yield();  // yield before block
583	–	}
584	–	else if (casHash(h, h | WAITING)) {
585	–	synchronized (this) {
586	–	if (tabAt(tab, i) == this &&
587	–	(hash & WAITING) == WAITING) {
588	–	try {
589	–	wait();
590	–	} catch (InterruptedException ie) {
591	–	Thread.currentThread().interrupt();
592	–	}
593	–	}
594	–	else
595	–	notifyAll(); // possibly won race vs signaller
596	–	}
597	–	break;
598	–	}
599	–	}
600	–	}
601	–	}
602	–
603	–	// Unsafe mechanics for casHash
604	–	private static final sun.misc.Unsafe UNSAFE;
605	–	private static final long hashOffset;
606	–
607	–	static {
608	–	try {
609	–	UNSAFE = getUnsafe();
610	–	Class<?> k = Node.class;
611	–	hashOffset = UNSAFE.objectFieldOffset
612	–	(k.getDeclaredField("hash"));
613	–	} catch (Exception e) {
614	–	throw new Error(e);
615	–	}
616	–	}
686		}
687
688		/* ---------------- TreeBins -------------- */
#	Line 621 | Line 690 | public class ConcurrentHashMapV8<K, V>
690		/**
691		* Nodes for use in TreeBins
692		*/
693	<	static final class TreeNode extends Node {
694	<	TreeNode parent;  // red-black tree links
695	<	TreeNode left;
696	<	TreeNode right;
697	<	TreeNode prev;    // needed to unlink next upon deletion
693	>	static final class TreeNode<V> extends Node<V> {
694	>	TreeNode<V> parent;  // red-black tree links
695	>	TreeNode<V> left;
696	>	TreeNode<V> right;
697	>	TreeNode<V> prev;    // needed to unlink next upon deletion
698		boolean red;
699
700	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
700	>	TreeNode(int hash, Object key, V val, Node<V> next, TreeNode<V> parent) {
701		super(hash, key, val, next);
702		this.parent = parent;
703		}
#	Line 660 | Line 729 | public class ConcurrentHashMapV8<K, V>
729		* TreeBins also maintain a separate locking discipline than
730		* regular bins. Because they are forwarded via special MOVED
731		* nodes at bin heads (which can never change once established),
732	<	* we cannot use use those nodes as locks. Instead, TreeBin
732	>	* we cannot use those nodes as locks. Instead, TreeBin
733		* extends AbstractQueuedSynchronizer to support a simple form of
734		* read-write lock. For update operations and table validation,
735		* the exclusive form of lock behaves in the same way as bin-head
#	Line 677 | Line 746 | public class ConcurrentHashMapV8<K, V>
746		* and writers. Since we don't need to export full Lock API, we
747		* just override the minimal AQS methods and use them directly.
748		*/
749	<	static final class TreeBin extends AbstractQueuedSynchronizer {
749	>	static final class TreeBin<V> extends AbstractQueuedSynchronizer {
750		private static final long serialVersionUID = 2249069246763182397L;
751	<	transient TreeNode root;  // root of tree
752	<	transient TreeNode first; // head of next-pointer list
751	>	transient TreeNode<V> root;  // root of tree
752	>	transient TreeNode<V> first; // head of next-pointer list
753
754		/* AQS overrides */
755		public final boolean isHeldExclusively() { return getState() > 0; }
#	Line 711 | Line 780 | public class ConcurrentHashMapV8<K, V>
780		}
781
782		/** From CLR */
783	<	private void rotateLeft(TreeNode p) {
783	>	private void rotateLeft(TreeNode<V> p) {
784		if (p != null) {
785	<	TreeNode r = p.right, pp, rl;
785	>	TreeNode<V> r = p.right, pp, rl;
786		if ((rl = p.right = r.left) != null)
787		rl.parent = p;
788		if ((pp = r.parent = p.parent) == null)
#	Line 728 | Line 797 | public class ConcurrentHashMapV8<K, V>
797		}
798
799		/** From CLR */
800	<	private void rotateRight(TreeNode p) {
800	>	private void rotateRight(TreeNode<V> p) {
801		if (p != null) {
802	<	TreeNode l = p.left, pp, lr;
802	>	TreeNode<V> l = p.left, pp, lr;
803		if ((lr = p.left = l.right) != null)
804		lr.parent = p;
805		if ((pp = l.parent = p.parent) == null)
#	Line 745 | Line 814 | public class ConcurrentHashMapV8<K, V>
814		}
815
816		/**
817	<	* Return the TreeNode (or null if not found) for the given key
817	>	* Returns the TreeNode (or null if not found) for the given key
818		* starting at given root.
819		*/
820	<	@SuppressWarnings("unchecked") // suppress Comparable cast warning
821	<	final TreeNode getTreeNode(int h, Object k, TreeNode p) {
820	>	@SuppressWarnings("unchecked") final TreeNode<V> getTreeNode
821	>	(int h, Object k, TreeNode<V> p) {
822		Class<?> c = k.getClass();
823		while (p != null) {
824		int dir, ph;  Object pk; Class<?> pc;
#	Line 759 | Line 828 | public class ConcurrentHashMapV8<K, V>
828		if (c != (pc = pk.getClass()) ||
829		!(k instanceof Comparable) ||
830		(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
831	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
832	<	TreeNode r = null, s = null, pl, pr;
833	<	if (dir >= 0) {
834	<	if ((pl = p.left) != null && h <= pl.hash)
835	<	s = pl;
831	>	if ((dir = (c == pc) ? 0 :
832	>	c.getName().compareTo(pc.getName())) == 0) {
833	>	TreeNode<V> r = null, pl, pr; // check both sides
834	>	if ((pr = p.right) != null && h >= pr.hash &&
835	>	(r = getTreeNode(h, k, pr)) != null)
836	>	return r;
837	>	else if ((pl = p.left) != null && h <= pl.hash)
838	>	dir = -1;
839	>	else // nothing there
840	>	return null;
841		}
768	–	else if ((pr = p.right) != null && h >= pr.hash)
769	–	s = pr;
770	–	if (s != null && (r = getTreeNode(h, k, s)) != null)
771	–	return r;
842		}
843		}
844		else
#	Line 783 | Line 853 | public class ConcurrentHashMapV8<K, V>
853		* read-lock to call getTreeNode, but during failure to get
854		* lock, searches along next links.
855		*/
856	<	final Object getValue(int h, Object k) {
857	<	Node r = null;
856	>	final V getValue(int h, Object k) {
857	>	Node<V> r = null;
858		int c = getState(); // Must read lock state first
859	<	for (Node e = first; e != null; e = e.next) {
859	>	for (Node<V> e = first; e != null; e = e.next) {
860		if (c <= 0 && compareAndSetState(c, c - 1)) {
861		try {
862		r = getTreeNode(h, k, root);
#	Line 795 | Line 865 | public class ConcurrentHashMapV8<K, V>
865		}
866		break;
867		}
868	<	else if ((e.hash & HASH_BITS) == h && k.equals(e.key)) {
868	>	else if (e.hash == h && k.equals(e.key)) {
869		r = e;
870		break;
871		}
#	Line 806 | Line 876 | public class ConcurrentHashMapV8<K, V>
876		}
877
878		/**
879	<	* Find or add a node
879	>	* Finds or adds a node.
880		* @return null if added
881		*/
882	<	@SuppressWarnings("unchecked") // suppress Comparable cast warning
883	<	final TreeNode putTreeNode(int h, Object k, Object v) {
882	>	@SuppressWarnings("unchecked") final TreeNode<V> putTreeNode
883	>	(int h, Object k, V v) {
884		Class<?> c = k.getClass();
885	<	TreeNode pp = root, p = null;
885	>	TreeNode<V> pp = root, p = null;
886		int dir = 0;
887		while (pp != null) { // find existing node or leaf to insert at
888		int ph;  Object pk; Class<?> pc;
#	Line 823 | Line 893 | public class ConcurrentHashMapV8<K, V>
893		if (c != (pc = pk.getClass()) ||
894		!(k instanceof Comparable) ||
895		(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
896	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
897	<	TreeNode r = null, s = null, pl, pr;
898	<	if (dir >= 0) {
899	<	if ((pl = p.left) != null && h <= pl.hash)
900	<	s = pl;
896	>	TreeNode<V> s = null, r = null, pr;
897	>	if ((dir = (c == pc) ? 0 :
898	>	c.getName().compareTo(pc.getName())) == 0) {
899	>	if ((pr = p.right) != null && h >= pr.hash &&
900	>	(r = getTreeNode(h, k, pr)) != null)
901	>	return r;
902	>	else // continue left
903	>	dir = -1;
904		}
905		else if ((pr = p.right) != null && h >= pr.hash)
906		s = pr;
#	Line 840 | Line 913 | public class ConcurrentHashMapV8<K, V>
913		pp = (dir > 0) ? p.right : p.left;
914		}
915
916	<	TreeNode f = first;
917	<	TreeNode x = first = new TreeNode(h, k, v, f, p);
916	>	TreeNode<V> f = first;
917	>	TreeNode<V> x = first = new TreeNode<V>(h, k, v, f, p);
918		if (p == null)
919		root = x;
920		else { // attach and rebalance; adapted from CLR
921	<	TreeNode xp, xpp;
921	>	TreeNode<V> xp, xpp;
922		if (f != null)
923		f.prev = x;
924		if (dir <= 0)
#	Line 855 | Line 928 | public class ConcurrentHashMapV8<K, V>
928		x.red = true;
929		while (x != null && (xp = x.parent) != null && xp.red &&
930		(xpp = xp.parent) != null) {
931	<	TreeNode xppl = xpp.left;
931	>	TreeNode<V> xppl = xpp.left;
932		if (xp == xppl) {
933	<	TreeNode y = xpp.right;
933	>	TreeNode<V> y = xpp.right;
934		if (y != null && y.red) {
935		y.red = false;
936		xp.red = false;
#	Line 879 | Line 952 | public class ConcurrentHashMapV8<K, V>
952		}
953		}
954		else {
955	<	TreeNode y = xppl;
955	>	TreeNode<V> y = xppl;
956		if (y != null && y.red) {
957		y.red = false;
958		xp.red = false;
#	Line 901 | Line 974 | public class ConcurrentHashMapV8<K, V>
974		}
975		}
976		}
977	<	TreeNode r = root;
977	>	TreeNode<V> r = root;
978		if (r != null && r.red)
979		r.red = false;
980		}
#	Line 916 | Line 989 | public class ConcurrentHashMapV8<K, V>
989		* that are accessible independently of lock. So instead we
990		* swap the tree linkages.
991		*/
992	<	final void deleteTreeNode(TreeNode p) {
993	<	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
994	<	TreeNode pred = p.prev;
992	>	final void deleteTreeNode(TreeNode<V> p) {
993	>	TreeNode<V> next = (TreeNode<V>)p.next; // unlink traversal pointers
994	>	TreeNode<V> pred = p.prev;
995		if (pred == null)
996		first = next;
997		else
998		pred.next = next;
999		if (next != null)
1000		next.prev = pred;
1001	<	TreeNode replacement;
1002	<	TreeNode pl = p.left;
1003	<	TreeNode pr = p.right;
1001	>	TreeNode<V> replacement;
1002	>	TreeNode<V> pl = p.left;
1003	>	TreeNode<V> pr = p.right;
1004		if (pl != null && pr != null) {
1005	<	TreeNode s = pr, sl;
1005	>	TreeNode<V> s = pr, sl;
1006		while ((sl = s.left) != null) // find successor
1007		s = sl;
1008		boolean c = s.red; s.red = p.red; p.red = c; // swap colors
1009	<	TreeNode sr = s.right;
1010	<	TreeNode pp = p.parent;
1009	>	TreeNode<V> sr = s.right;
1010	>	TreeNode<V> pp = p.parent;
1011		if (s == pr) { // p was s's direct parent
1012		p.parent = s;
1013		s.right = p;
1014		}
1015		else {
1016	<	TreeNode sp = s.parent;
1016	>	TreeNode<V> sp = s.parent;
1017		if ((p.parent = sp) != null) {
1018		if (s == sp.left)
1019		sp.left = p;
#	Line 965 | Line 1038 | public class ConcurrentHashMapV8<K, V>
1038		}
1039		else
1040		replacement = (pl != null) ? pl : pr;
1041	<	TreeNode pp = p.parent;
1041	>	TreeNode<V> pp = p.parent;
1042		if (replacement == null) {
1043		if (pp == null) {
1044		root = null;
#	Line 984 | Line 1057 | public class ConcurrentHashMapV8<K, V>
1057		p.left = p.right = p.parent = null;
1058		}
1059		if (!p.red) { // rebalance, from CLR
1060	<	TreeNode x = replacement;
1060	>	TreeNode<V> x = replacement;
1061		while (x != null) {
1062	<	TreeNode xp, xpl;
1062	>	TreeNode<V> xp, xpl;
1063		if (x.red || (xp = x.parent) == null) {
1064		x.red = false;
1065		break;
1066		}
1067		if (x == (xpl = xp.left)) {
1068	<	TreeNode sib = xp.right;
1068	>	TreeNode<V> sib = xp.right;
1069		if (sib != null && sib.red) {
1070		sib.red = false;
1071		xp.red = true;
#	Line 1002 | Line 1075 | public class ConcurrentHashMapV8<K, V>
1075		if (sib == null)
1076		x = xp;
1077		else {
1078	<	TreeNode sl = sib.left, sr = sib.right;
1078	>	TreeNode<V> sl = sib.left, sr = sib.right;
1079		if ((sr == null || !sr.red) &&
1080		(sl == null || !sl.red)) {
1081		sib.red = true;
#	Line 1014 | Line 1087 | public class ConcurrentHashMapV8<K, V>
1087		sl.red = false;
1088		sib.red = true;
1089		rotateRight(sib);
1090	<	sib = (xp = x.parent) == null ? null : xp.right;
1090	>	sib = (xp = x.parent) == null ?
1091	>	null : xp.right;
1092		}
1093		if (sib != null) {
1094		sib.red = (xp == null) ? false : xp.red;
#	Line 1030 | Line 1104 | public class ConcurrentHashMapV8<K, V>
1104		}
1105		}
1106		else { // symmetric
1107	<	TreeNode sib = xpl;
1107	>	TreeNode<V> sib = xpl;
1108		if (sib != null && sib.red) {
1109		sib.red = false;
1110		xp.red = true;
#	Line 1040 | Line 1114 | public class ConcurrentHashMapV8<K, V>
1114		if (sib == null)
1115		x = xp;
1116		else {
1117	<	TreeNode sl = sib.left, sr = sib.right;
1117	>	TreeNode<V> sl = sib.left, sr = sib.right;
1118		if ((sl == null || !sl.red) &&
1119		(sr == null || !sr.red)) {
1120		sib.red = true;
#	Line 1052 | Line 1126 | public class ConcurrentHashMapV8<K, V>
1126		sr.red = false;
1127		sib.red = true;
1128		rotateLeft(sib);
1129	<	sib = (xp = x.parent) == null ? null : xp.left;
1129	>	sib = (xp = x.parent) == null ?
1130	>	null : xp.left;
1131		}
1132		if (sib != null) {
1133		sib.red = (xp == null) ? false : xp.red;
#	Line 1082 | Line 1157 | public class ConcurrentHashMapV8<K, V>
1157		/* ---------------- Collision reduction methods -------------- */
1158
1159		/**
1160	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
1160	>	* Spreads higher bits to lower, and also forces top bit to 0.
1161		* Because the table uses power-of-two masking, sets of hashes
1162		* that vary only in bits above the current mask will always
1163		* collide. (Among known examples are sets of Float keys holding
#	Line 1100 | Line 1175 | public class ConcurrentHashMapV8<K, V>
1175		}
1176
1177		/**
1178	<	* Replaces a list bin with a tree bin. Call only when locked.
1179	<	* Fails to replace if the given key is non-comparable or table
1180	<	* is, or needs, resizing.
1181	<	*/
1182	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
1183	<	if ((key instanceof Comparable) &&
1184	<	(tab.length >= MAXIMUM_CAPACITY || counter.sum() < (long)sizeCtl)) {
1185	<	TreeBin t = new TreeBin();
1186	<	for (Node e = tabAt(tab, index); e != null; e = e.next)
1112	<	t.putTreeNode(e.hash & HASH_BITS, e.key, e.val);
1113	<	setTabAt(tab, index, new Node(MOVED, t, null, null));
1178	>	* Replaces a list bin with a tree bin if key is comparable.  Call
1179	>	* only when locked.
1180	>	*/
1181	>	private final void replaceWithTreeBin(Node<V>[] tab, int index, Object key) {
1182	>	if (key instanceof Comparable) {
1183	>	TreeBin<V> t = new TreeBin<V>();
1184	>	for (Node<V> e = tabAt(tab, index); e != null; e = e.next)
1185	>	t.putTreeNode(e.hash, e.key, e.val);
1186	>	setTabAt(tab, index, new Node<V>(MOVED, t, null, null));
1187		}
1188		}
1189
1190		/* ---------------- Internal access and update methods -------------- */
1191
1192		/** Implementation for get and containsKey */
1193	<	private final Object internalGet(Object k) {
1193	>	@SuppressWarnings("unchecked") private final V internalGet(Object k) {
1194		int h = spread(k.hashCode());
1195	<	retry: for (Node[] tab = table; tab != null;) {
1196	<	Node e, p; Object ek, ev; int eh;      // locals to read fields once
1195	>	retry: for (Node<V>[] tab = table; tab != null;) {
1196	>	Node<V> e; Object ek; V ev; int eh; // locals to read fields once
1197		for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1198	<	if ((eh = e.hash) == MOVED) {
1198	>	if ((eh = e.hash) < 0) {
1199		if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1200	<	return ((TreeBin)ek).getValue(h, k);
1201	<	else {                        // restart with new table
1202	<	tab = (Node[])ek;
1200	>	return ((TreeBin<V>)ek).getValue(h, k);
1201	>	else {                      // restart with new table
1202	>	tab = (Node<V>[])ek;
1203		continue retry;
1204		}
1205		}
1206	<	else if ((eh & HASH_BITS) == h && (ev = e.val) != null &&
1206	>	else if (eh == h && (ev = e.val) != null &&
1207		((ek = e.key) == k || k.equals(ek)))
1208		return ev;
1209		}
#	Line 1144 | Line 1217 | public class ConcurrentHashMapV8<K, V>
1217		* Replaces node value with v, conditional upon match of cv if
1218		* non-null.  If resulting value is null, delete.
1219		*/
1220	<	private final Object internalReplace(Object k, Object v, Object cv) {
1220	>	@SuppressWarnings("unchecked") private final V internalReplace
1221	>	(Object k, V v, Object cv) {
1222		int h = spread(k.hashCode());
1223	<	Object oldVal = null;
1224	<	for (Node[] tab = table;;) {
1225	<	Node f; int i, fh; Object fk;
1223	>	V oldVal = null;
1224	>	for (Node<V>[] tab = table;;) {
1225	>	Node<V> f; int i, fh; Object fk;
1226		if (tab == null ||
1227		(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1228		break;
1229	<	else if ((fh = f.hash) == MOVED) {
1229	>	else if ((fh = f.hash) < 0) {
1230		if ((fk = f.key) instanceof TreeBin) {
1231	<	TreeBin t = (TreeBin)fk;
1231	>	TreeBin<V> t = (TreeBin<V>)fk;
1232		boolean validated = false;
1233		boolean deleted = false;
1234		t.acquire(0);
1235		try {
1236		if (tabAt(tab, i) == f) {
1237		validated = true;
1238	<	TreeNode p = t.getTreeNode(h, k, t.root);
1238	>	TreeNode<V> p = t.getTreeNode(h, k, t.root);
1239		if (p != null) {
1240	<	Object pv = p.val;
1240	>	V pv = p.val;
1241		if (cv == null || cv == pv || cv.equals(pv)) {
1242		oldVal = pv;
1243		if ((p.val = v) == null) {
#	Line 1178 | Line 1252 | public class ConcurrentHashMapV8<K, V>
1252		}
1253		if (validated) {
1254		if (deleted)
1255	<	counter.add(-1L);
1255	>	addCount(-1L, -1);
1256		break;
1257		}
1258		}
1259		else
1260	<	tab = (Node[])fk;
1260	>	tab = (Node<V>[])fk;
1261		}
1262	<	else if ((fh & HASH_BITS) != h && f.next == null) // precheck
1262	>	else if (fh != h && f.next == null) // precheck
1263		break;                          // rules out possible existence
1264	<	else if ((fh & LOCKED) != 0) {
1191	<	checkForResize();               // try resizing if can't get lock
1192	<	f.tryAwaitLock(tab, i);
1193	<	}
1194	<	else if (f.casHash(fh, fh | LOCKED)) {
1264	>	else {
1265		boolean validated = false;
1266		boolean deleted = false;
1267	<	try {
1267	>	synchronized (f) {
1268		if (tabAt(tab, i) == f) {
1269		validated = true;
1270	<	for (Node e = f, pred = null;;) {
1271	<	Object ek, ev;
1272	<	if ((e.hash & HASH_BITS) == h &&
1270	>	for (Node<V> e = f, pred = null;;) {
1271	>	Object ek; V ev;
1272	>	if (e.hash == h &&
1273		((ev = e.val) != null) &&
1274		((ek = e.key) == k || k.equals(ek))) {
1275		if (cv == null || cv == ev || cv.equals(ev)) {
1276		oldVal = ev;
1277		if ((e.val = v) == null) {
1278		deleted = true;
1279	<	Node en = e.next;
1279	>	Node<V> en = e.next;
1280		if (pred != null)
1281		pred.next = en;
1282		else
#	Line 1220 | Line 1290 | public class ConcurrentHashMapV8<K, V>
1290		break;
1291		}
1292		}
1223	–	} finally {
1224	–	if (!f.casHash(fh | LOCKED, fh)) {
1225	–	f.hash = fh;
1226	–	synchronized (f) { f.notifyAll(); };
1227	–	}
1293		}
1294		if (validated) {
1295		if (deleted)
1296	<	counter.add(-1L);
1296	>	addCount(-1L, -1);
1297		break;
1298		}
1299		}
#	Line 1237 | Line 1302 | public class ConcurrentHashMapV8<K, V>
1302		}
1303
1304		/*
1305	<	* Internal versions of the five insertion methods, each a
1306	<	* little more complicated than the last. All have
1242	<	* the same basic structure as the first (internalPut):
1305	>	* Internal versions of insertion methods
1306	>	* All have the same basic structure as the first (internalPut):
1307		*  1. If table uninitialized, create
1308		*  2. If bin empty, try to CAS new node
1309		*  3. If bin stale, use new table
1310		*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1311		*  5. Lock and validate; if valid, scan and add or update
1312		*
1313	<	* The others interweave other checks and/or alternative actions:
1314	<	*  * Plain put checks for and performs resize after insertion.
1315	<	*  * putIfAbsent prescans for mapping without lock (and fails to add
1316	<	*    if present), which also makes pre-emptive resize checks worthwhile.
1317	<	*  * computeIfAbsent extends form used in putIfAbsent with additional
1318	<	*    mechanics to deal with, calls, potential exceptions and null
1319	<	*    returns from function call.
1256	<	*  * compute uses the same function-call mechanics, but without
1257	<	*    the prescans
1258	<	*  * putAll attempts to pre-allocate enough table space
1259	<	*    and more lazily performs count updates and checks.
1260	<	*
1261	<	* Someday when details settle down a bit more, it might be worth
1262	<	* some factoring to reduce sprawl.
1313	>	* The putAll method differs mainly in attempting to pre-allocate
1314	>	* enough table space, and also more lazily performs count updates
1315	>	* and checks.
1316	>	*
1317	>	* Most of the function-accepting methods can't be factored nicely
1318	>	* because they require different functional forms, so instead
1319	>	* sprawl out similar mechanics.
1320		*/
1321
1322	<	/** Implementation for put */
1323	<	private final Object internalPut(Object k, Object v) {
1322	>	/** Implementation for put and putIfAbsent */
1323	>	@SuppressWarnings("unchecked") private final V internalPut
1324	>	(K k, V v, boolean onlyIfAbsent) {
1325	>	if (k == null || v == null) throw new NullPointerException();
1326		int h = spread(k.hashCode());
1327	<	int count = 0;
1328	<	for (Node[] tab = table;;) {
1329	<	int i; Node f; int fh; Object fk;
1327	>	int len = 0;
1328	>	for (Node<V>[] tab = table;;) {
1329	>	int i, fh; Node<V> f; Object fk; V fv;
1330		if (tab == null)
1331		tab = initTable();
1332		else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1333	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1333	>	if (casTabAt(tab, i, null, new Node<V>(h, k, v, null)))
1334		break;                   // no lock when adding to empty bin
1335		}
1336	<	else if ((fh = f.hash) == MOVED) {
1336	>	else if ((fh = f.hash) < 0) {
1337		if ((fk = f.key) instanceof TreeBin) {
1338	<	TreeBin t = (TreeBin)fk;
1339	<	Object oldVal = null;
1338	>	TreeBin<V> t = (TreeBin<V>)fk;
1339	>	V oldVal = null;
1340		t.acquire(0);
1341		try {
1342		if (tabAt(tab, i) == f) {
1343	<	count = 2;
1344	<	TreeNode p = t.putTreeNode(h, k, v);
1343	>	len = 2;
1344	>	TreeNode<V> p = t.putTreeNode(h, k, v);
1345		if (p != null) {
1346		oldVal = p.val;
1347	<	p.val = v;
1347	>	if (!onlyIfAbsent)
1348	>	p.val = v;
1349		}
1350		}
1351		} finally {
1352		t.release(0);
1353		}
1354	<	if (count != 0) {
1354	>	if (len != 0) {
1355		if (oldVal != null)
1356		return oldVal;
1357		break;
1358		}
1359		}
1360		else
1361	<	tab = (Node[])fk;
1361	>	tab = (Node<V>[])fk;
1362		}
1363	<	else if ((fh & LOCKED) != 0) {
1364	<	checkForResize();
1365	<	f.tryAwaitLock(tab, i);
1366	<	}
1367	<	else if (f.casHash(fh, fh | LOCKED)) {
1368	<	Object oldVal = null;
1309	<	try {                        // needed in case equals() throws
1363	>	else if (onlyIfAbsent && fh == h && (fv = f.val) != null &&
1364	>	((fk = f.key) == k || k.equals(fk))) // peek while nearby
1365	>	return fv;
1366	>	else {
1367	>	V oldVal = null;
1368	>	synchronized (f) {
1369		if (tabAt(tab, i) == f) {
1370	<	count = 1;
1371	<	for (Node e = f;; ++count) {
1372	<	Object ek, ev;
1373	<	if ((e.hash & HASH_BITS) == h &&
1370	>	len = 1;
1371	>	for (Node<V> e = f;; ++len) {
1372	>	Object ek; V ev;
1373	>	if (e.hash == h &&
1374		(ev = e.val) != null &&
1375		((ek = e.key) == k || k.equals(ek))) {
1376		oldVal = ev;
1377	<	e.val = v;
1377	>	if (!onlyIfAbsent)
1378	>	e.val = v;
1379		break;
1380		}
1381	<	Node last = e;
1381	>	Node<V> last = e;
1382		if ((e = e.next) == null) {
1383	<	last.next = new Node(h, k, v, null);
1384	<	if (count >= TREE_THRESHOLD)
1383	>	last.next = new Node<V>(h, k, v, null);
1384	>	if (len >= TREE_THRESHOLD)
1385		replaceWithTreeBin(tab, i, k);
1386		break;
1387		}
1388		}
1389		}
1330	–	} finally {                  // unlock and signal if needed
1331	–	if (!f.casHash(fh | LOCKED, fh)) {
1332	–	f.hash = fh;
1333	–	synchronized (f) { f.notifyAll(); };
1334	–	}
1390		}
1391	<	if (count != 0) {
1391	>	if (len != 0) {
1392		if (oldVal != null)
1393		return oldVal;
1339	–	if (tab.length <= 64)
1340	–	count = 2;
1394		break;
1395		}
1396		}
1397		}
1398	<	counter.add(1L);
1346	<	if (count > 1)
1347	<	checkForResize();
1398	>	addCount(1L, len);
1399		return null;
1400		}
1401
1402	<	/** Implementation for putIfAbsent */
1403	<	private final Object internalPutIfAbsent(Object k, Object v) {
1402	>	/** Implementation for computeIfAbsent */
1403	>	@SuppressWarnings("unchecked") private final V internalComputeIfAbsent
1404	>	(K k, Fun<? super K, ? extends V> mf) {
1405	>	if (k == null || mf == null)
1406	>	throw new NullPointerException();
1407		int h = spread(k.hashCode());
1408	<	int count = 0;
1409	<	for (Node[] tab = table;;) {
1410	<	int i; Node f; int fh; Object fk, fv;
1408	>	V val = null;
1409	>	int len = 0;
1410	>	for (Node<V>[] tab = table;;) {
1411	>	Node<V> f; int i; Object fk;
1412		if (tab == null)
1413		tab = initTable();
1414		else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1415	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1415	>	Node<V> node = new Node<V>(h, k, null, null);
1416	>	synchronized (node) {
1417	>	if (casTabAt(tab, i, null, node)) {
1418	>	len = 1;
1419	>	try {
1420	>	if ((val = mf.apply(k)) != null)
1421	>	node.val = val;
1422	>	} finally {
1423	>	if (val == null)
1424	>	setTabAt(tab, i, null);
1425	>	}
1426	>	}
1427	>	}
1428	>	if (len != 0)
1429		break;
1430		}
1431	<	else if ((fh = f.hash) == MOVED) {
1431	>	else if (f.hash < 0) {
1432		if ((fk = f.key) instanceof TreeBin) {
1433	<	TreeBin t = (TreeBin)fk;
1434	<	Object oldVal = null;
1433	>	TreeBin<V> t = (TreeBin<V>)fk;
1434	>	boolean added = false;
1435		t.acquire(0);
1436		try {
1437		if (tabAt(tab, i) == f) {
1438	<	count = 2;
1439	<	TreeNode p = t.putTreeNode(h, k, v);
1438	>	len = 1;
1439	>	TreeNode<V> p = t.getTreeNode(h, k, t.root);
1440		if (p != null)
1441	<	oldVal = p.val;
1441	>	val = p.val;
1442	>	else if ((val = mf.apply(k)) != null) {
1443	>	added = true;
1444	>	len = 2;
1445	>	t.putTreeNode(h, k, val);
1446	>	}
1447		}
1448		} finally {
1449		t.release(0);
1450		}
1451	<	if (count != 0) {
1452	<	if (oldVal != null)
1453	<	return oldVal;
1451	>	if (len != 0) {
1452	>	if (!added)
1453	>	return val;
1454		break;
1455		}
1456		}
1457		else
1458	<	tab = (Node[])fk;
1458	>	tab = (Node<V>[])fk;
1459		}
1387	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1388	–	((fk = f.key) == k || k.equals(fk)))
1389	–	return fv;
1460		else {
1461	<	Node g = f.next;
1462	<	if (g != null) { // at least 2 nodes -- search and maybe resize
1463	<	for (Node e = g;;) {
1464	<	Object ek, ev;
1465	<	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1396	<	((ek = e.key) == k || k.equals(ek)))
1397	<	return ev;
1398	<	if ((e = e.next) == null) {
1399	<	checkForResize();
1400	<	break;
1401	<	}
1402	<	}
1461	>	for (Node<V> e = f; e != null; e = e.next) { // prescan
1462	>	Object ek; V ev;
1463	>	if (e.hash == h && (ev = e.val) != null &&
1464	>	((ek = e.key) == k || k.equals(ek)))
1465	>	return ev;
1466		}
1467	<	if (((fh = f.hash) & LOCKED) != 0) {
1468	<	checkForResize();
1469	<	f.tryAwaitLock(tab, i);
1470	<	}
1471	<	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1472	<	Object oldVal = null;
1473	<	try {
1474	<	if (tabAt(tab, i) == f) {
1475	<	count = 1;
1476	<	for (Node e = f;; ++count) {
1477	<	Object ek, ev;
1478	<	if ((e.hash & HASH_BITS) == h &&
1479	<	(ev = e.val) != null &&
1480	<	((ek = e.key) == k || k.equals(ek))) {
1481	<	oldVal = ev;
1482	<	break;
1483	<	}
1484	<	Node last = e;
1422	<	if ((e = e.next) == null) {
1423	<	last.next = new Node(h, k, v, null);
1424	<	if (count >= TREE_THRESHOLD)
1467	>	boolean added = false;
1468	>	synchronized (f) {
1469	>	if (tabAt(tab, i) == f) {
1470	>	len = 1;
1471	>	for (Node<V> e = f;; ++len) {
1472	>	Object ek; V ev;
1473	>	if (e.hash == h &&
1474	>	(ev = e.val) != null &&
1475	>	((ek = e.key) == k || k.equals(ek))) {
1476	>	val = ev;
1477	>	break;
1478	>	}
1479	>	Node<V> last = e;
1480	>	if ((e = e.next) == null) {
1481	>	if ((val = mf.apply(k)) != null) {
1482	>	added = true;
1483	>	last.next = new Node<V>(h, k, val, null);
1484	>	if (len >= TREE_THRESHOLD)
1485		replaceWithTreeBin(tab, i, k);
1426	–	break;
1486		}
1487	+	break;
1488		}
1489		}
1430	–	} finally {
1431	–	if (!f.casHash(fh | LOCKED, fh)) {
1432	–	f.hash = fh;
1433	–	synchronized (f) { f.notifyAll(); };
1434	–	}
1435	–	}
1436	–	if (count != 0) {
1437	–	if (oldVal != null)
1438	–	return oldVal;
1439	–	if (tab.length <= 64)
1440	–	count = 2;
1441	–	break;
1490		}
1491		}
1492	+	if (len != 0) {
1493	+	if (!added)
1494	+	return val;
1495	+	break;
1496	+	}
1497		}
1498		}
1499	<	counter.add(1L);
1500	<	if (count > 1)
1501	<	checkForResize();
1449	<	return null;
1499	>	if (val != null)
1500	>	addCount(1L, len);
1501	>	return val;
1502		}
1503
1504	<	/** Implementation for computeIfAbsent */
1505	<	private final Object internalComputeIfAbsent(K k,
1506	<	MappingFunction<? super K, ?> mf) {
1504	>	/** Implementation for compute */
1505	>	@SuppressWarnings("unchecked") private final V internalCompute
1506	>	(K k, boolean onlyIfPresent,
1507	>	BiFun<? super K, ? super V, ? extends V> mf) {
1508	>	if (k == null || mf == null)
1509	>	throw new NullPointerException();
1510		int h = spread(k.hashCode());
1511	<	Object val = null;
1512	<	int count = 0;
1513	<	for (Node[] tab = table;;) {
1514	<	Node f; int i, fh; Object fk, fv;
1511	>	V val = null;
1512	>	int delta = 0;
1513	>	int len = 0;
1514	>	for (Node<V>[] tab = table;;) {
1515	>	Node<V> f; int i, fh; Object fk;
1516		if (tab == null)
1517		tab = initTable();
1518		else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1519	<	Node node = new Node(fh = h | LOCKED, k, null, null);
1520	<	if (casTabAt(tab, i, null, node)) {
1521	<	count = 1;
1522	<	try {
1523	<	if ((val = mf.map(k)) != null)
1524	<	node.val = val;
1525	<	} finally {
1526	<	if (val == null)
1527	<	setTabAt(tab, i, null);
1528	<	if (!node.casHash(fh, h)) {
1529	<	node.hash = h;
1530	<	synchronized (node) { node.notifyAll(); };
1519	>	if (onlyIfPresent)
1520	>	break;
1521	>	Node<V> node = new Node<V>(h, k, null, null);
1522	>	synchronized (node) {
1523	>	if (casTabAt(tab, i, null, node)) {
1524	>	try {
1525	>	len = 1;
1526	>	if ((val = mf.apply(k, null)) != null) {
1527	>	node.val = val;
1528	>	delta = 1;
1529	>	}
1530	>	} finally {
1531	>	if (delta == 0)
1532	>	setTabAt(tab, i, null);
1533		}
1534		}
1535		}
1536	<	if (count != 0)
1536	>	if (len != 0)
1537		break;
1538		}
1539	<	else if ((fh = f.hash) == MOVED) {
1539	>	else if ((fh = f.hash) < 0) {
1540		if ((fk = f.key) instanceof TreeBin) {
1541	<	TreeBin t = (TreeBin)fk;
1484	<	boolean added = false;
1541	>	TreeBin<V> t = (TreeBin<V>)fk;
1542		t.acquire(0);
1543		try {
1544		if (tabAt(tab, i) == f) {
1545	<	count = 1;
1546	<	TreeNode p = t.getTreeNode(h, k, t.root);
1547	<	if (p != null)
1548	<	val = p.val;
1549	<	else if ((val = mf.map(k)) != null) {
1550	<	added = true;
1551	<	count = 2;
1552	<	t.putTreeNode(h, k, val);
1545	>	len = 1;
1546	>	TreeNode<V> p = t.getTreeNode(h, k, t.root);
1547	>	if (p == null && onlyIfPresent)
1548	>	break;
1549	>	V pv = (p == null) ? null : p.val;
1550	>	if ((val = mf.apply(k, pv)) != null) {
1551	>	if (p != null)
1552	>	p.val = val;
1553	>	else {
1554	>	len = 2;
1555	>	delta = 1;
1556	>	t.putTreeNode(h, k, val);
1557	>	}
1558	>	}
1559	>	else if (p != null) {
1560	>	delta = -1;
1561	>	t.deleteTreeNode(p);
1562		}
1563		}
1564		} finally {
1565		t.release(0);
1566		}
1567	<	if (count != 0) {
1502	<	if (!added)
1503	<	return val;
1567	>	if (len != 0)
1568		break;
1505	–	}
1569		}
1570		else
1571	<	tab = (Node[])fk;
1571	>	tab = (Node<V>[])fk;
1572		}
1510	–	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1511	–	((fk = f.key) == k || k.equals(fk)))
1512	–	return fv;
1573		else {
1574	<	Node g = f.next;
1575	<	if (g != null) {
1576	<	for (Node e = g;;) {
1577	<	Object ek, ev;
1578	<	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1579	<	((ek = e.key) == k || k.equals(ek)))
1580	<	return ev;
1581	<	if ((e = e.next) == null) {
1582	<	checkForResize();
1583	<	break;
1584	<	}
1585	<	}
1586	<	}
1587	<	if (((fh = f.hash) & LOCKED) != 0) {
1588	<	checkForResize();
1589	<	f.tryAwaitLock(tab, i);
1590	<	}
1591	<	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1532	<	boolean added = false;
1533	<	try {
1534	<	if (tabAt(tab, i) == f) {
1535	<	count = 1;
1536	<	for (Node e = f;; ++count) {
1537	<	Object ek, ev;
1538	<	if ((e.hash & HASH_BITS) == h &&
1539	<	(ev = e.val) != null &&
1540	<	((ek = e.key) == k || k.equals(ek))) {
1541	<	val = ev;
1542	<	break;
1574	>	synchronized (f) {
1575	>	if (tabAt(tab, i) == f) {
1576	>	len = 1;
1577	>	for (Node<V> e = f, pred = null;; ++len) {
1578	>	Object ek; V ev;
1579	>	if (e.hash == h &&
1580	>	(ev = e.val) != null &&
1581	>	((ek = e.key) == k || k.equals(ek))) {
1582	>	val = mf.apply(k, ev);
1583	>	if (val != null)
1584	>	e.val = val;
1585	>	else {
1586	>	delta = -1;
1587	>	Node<V> en = e.next;
1588	>	if (pred != null)
1589	>	pred.next = en;
1590	>	else
1591	>	setTabAt(tab, i, en);
1592		}
1593	<	Node last = e;
1594	<	if ((e = e.next) == null) {
1595	<	if ((val = mf.map(k)) != null) {
1596	<	added = true;
1597	<	last.next = new Node(h, k, val, null);
1598	<	if (count >= TREE_THRESHOLD)
1599	<	replaceWithTreeBin(tab, i, k);
1600	<	}
1601	<	break;
1593	>	break;
1594	>	}
1595	>	pred = e;
1596	>	if ((e = e.next) == null) {
1597	>	if (!onlyIfPresent &&
1598	>	(val = mf.apply(k, null)) != null) {
1599	>	pred.next = new Node<V>(h, k, val, null);
1600	>	delta = 1;
1601	>	if (len >= TREE_THRESHOLD)
1602	>	replaceWithTreeBin(tab, i, k);
1603		}
1604	+	break;
1605		}
1606		}
1556	–	} finally {
1557	–	if (!f.casHash(fh | LOCKED, fh)) {
1558	–	f.hash = fh;
1559	–	synchronized (f) { f.notifyAll(); };
1560	–	}
1561	–	}
1562	–	if (count != 0) {
1563	–	if (!added)
1564	–	return val;
1565	–	if (tab.length <= 64)
1566	–	count = 2;
1567	–	break;
1607		}
1608		}
1609	+	if (len != 0)
1610	+	break;
1611		}
1612		}
1613	<	if (val != null) {
1614	<	counter.add(1L);
1574	<	if (count > 1)
1575	<	checkForResize();
1576	<	}
1613	>	if (delta != 0)
1614	>	addCount((long)delta, len);
1615		return val;
1616		}
1617
1618	<	/** Implementation for compute */
1619	<	@SuppressWarnings("unchecked")
1620	<	private final Object internalCompute(K k,
1621	<	RemappingFunction<? super K, V> mf) {
1618	>	/** Implementation for merge */
1619	>	@SuppressWarnings("unchecked") private final V internalMerge
1620	>	(K k, V v, BiFun<? super V, ? super V, ? extends V> mf) {
1621	>	if (k == null || v == null || mf == null)
1622	>	throw new NullPointerException();
1623		int h = spread(k.hashCode());
1624	<	Object val = null;
1624	>	V val = null;
1625		int delta = 0;
1626	<	int count = 0;
1627	<	for (Node[] tab = table;;) {
1628	<	Node f; int i, fh; Object fk;
1626	>	int len = 0;
1627	>	for (Node<V>[] tab = table;;) {
1628	>	int i; Node<V> f; Object fk; V fv;
1629		if (tab == null)
1630		tab = initTable();
1631		else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1632	<	Node node = new Node(fh = h | LOCKED, k, null, null);
1633	<	if (casTabAt(tab, i, null, node)) {
1634	<	try {
1596	<	count = 1;
1597	<	if ((val = mf.remap(k, null)) != null) {
1598	<	node.val = val;
1599	<	delta = 1;
1600	<	}
1601	<	} finally {
1602	<	if (delta == 0)
1603	<	setTabAt(tab, i, null);
1604	<	if (!node.casHash(fh, h)) {
1605	<	node.hash = h;
1606	<	synchronized (node) { node.notifyAll(); };
1607	<	}
1608	<	}
1609	<	}
1610	<	if (count != 0)
1632	>	if (casTabAt(tab, i, null, new Node<V>(h, k, v, null))) {
1633	>	delta = 1;
1634	>	val = v;
1635		break;
1636	+	}
1637		}
1638	<	else if ((fh = f.hash) == MOVED) {
1638	>	else if (f.hash < 0) {
1639		if ((fk = f.key) instanceof TreeBin) {
1640	<	TreeBin t = (TreeBin)fk;
1640	>	TreeBin<V> t = (TreeBin<V>)fk;
1641		t.acquire(0);
1642		try {
1643		if (tabAt(tab, i) == f) {
1644	<	count = 1;
1645	<	TreeNode p = t.getTreeNode(h, k, t.root);
1646	<	Object pv = (p == null) ? null : p.val;
1647	<	if ((val = mf.remap(k, (V)pv)) != null) {
1644	>	len = 1;
1645	>	TreeNode<V> p = t.getTreeNode(h, k, t.root);
1646	>	val = (p == null) ? v : mf.apply(p.val, v);
1647	>	if (val != null) {
1648		if (p != null)
1649		p.val = val;
1650		else {
1651	<	count = 2;
1651	>	len = 2;
1652		delta = 1;
1653		t.putTreeNode(h, k, val);
1654		}
#	Line 1636 | Line 1661 | public class ConcurrentHashMapV8<K, V>
1661		} finally {
1662		t.release(0);
1663		}
1664	<	if (count != 0)
1664	>	if (len != 0)
1665		break;
1666		}
1667		else
1668	<	tab = (Node[])fk;
1668	>	tab = (Node<V>[])fk;
1669		}
1670	<	else if ((fh & LOCKED) != 0) {
1671	<	checkForResize();
1647	<	f.tryAwaitLock(tab, i);
1648	<	}
1649	<	else if (f.casHash(fh, fh | LOCKED)) {
1650	<	try {
1670	>	else {
1671	>	synchronized (f) {
1672		if (tabAt(tab, i) == f) {
1673	<	count = 1;
1674	<	for (Node e = f, pred = null;; ++count) {
1675	<	Object ek, ev;
1676	<	if ((e.hash & HASH_BITS) == h &&
1673	>	len = 1;
1674	>	for (Node<V> e = f, pred = null;; ++len) {
1675	>	Object ek; V ev;
1676	>	if (e.hash == h &&
1677		(ev = e.val) != null &&
1678		((ek = e.key) == k || k.equals(ek))) {
1679	<	val = mf.remap(k, (V)ev);
1679	>	val = mf.apply(ev, v);
1680		if (val != null)
1681		e.val = val;
1682		else {
1683		delta = -1;
1684	<	Node en = e.next;
1684	>	Node<V> en = e.next;
1685		if (pred != null)
1686		pred.next = en;
1687		else
#	Line 1670 | Line 1691 | public class ConcurrentHashMapV8<K, V>
1691		}
1692		pred = e;
1693		if ((e = e.next) == null) {
1694	<	if ((val = mf.remap(k, null)) != null) {
1695	<	pred.next = new Node(h, k, val, null);
1696	<	delta = 1;
1697	<	if (count >= TREE_THRESHOLD)
1698	<	replaceWithTreeBin(tab, i, k);
1678	<	}
1694	>	val = v;
1695	>	pred.next = new Node<V>(h, k, val, null);
1696	>	delta = 1;
1697	>	if (len >= TREE_THRESHOLD)
1698	>	replaceWithTreeBin(tab, i, k);
1699		break;
1700		}
1701		}
1702		}
1683	–	} finally {
1684	–	if (!f.casHash(fh | LOCKED, fh)) {
1685	–	f.hash = fh;
1686	–	synchronized (f) { f.notifyAll(); };
1687	–	}
1703		}
1704	<	if (count != 0) {
1690	<	if (tab.length <= 64)
1691	<	count = 2;
1704	>	if (len != 0)
1705		break;
1693	–	}
1706		}
1707		}
1708	<	if (delta != 0) {
1709	<	counter.add((long)delta);
1698	<	if (count > 1)
1699	<	checkForResize();
1700	<	}
1708	>	if (delta != 0)
1709	>	addCount((long)delta, len);
1710		return val;
1711		}
1712
1713		/** Implementation for putAll */
1714	<	private final void internalPutAll(Map<?, ?> m) {
1714	>	@SuppressWarnings("unchecked") private final void internalPutAll
1715	>	(Map<? extends K, ? extends V> m) {
1716		tryPresize(m.size());
1717		long delta = 0L;     // number of uncommitted additions
1718		boolean npe = false; // to throw exception on exit for nulls
1719		try {                // to clean up counts on other exceptions
1720	<	for (Map.Entry<?, ?> entry : m.entrySet()) {
1721	<	Object k, v;
1720	>	for (Map.Entry<?, ? extends V> entry : m.entrySet()) {
1721	>	Object k; V v;
1722		if (entry == null || (k = entry.getKey()) == null ||
1723		(v = entry.getValue()) == null) {
1724		npe = true;
1725		break;
1726		}
1727		int h = spread(k.hashCode());
1728	<	for (Node[] tab = table;;) {
1729	<	int i; Node f; int fh; Object fk;
1728	>	for (Node<V>[] tab = table;;) {
1729	>	int i; Node<V> f; int fh; Object fk;
1730		if (tab == null)
1731		tab = initTable();
1732		else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
1733	<	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1733	>	if (casTabAt(tab, i, null, new Node<V>(h, k, v, null))) {
1734		++delta;
1735		break;
1736		}
1737		}
1738	<	else if ((fh = f.hash) == MOVED) {
1738	>	else if ((fh = f.hash) < 0) {
1739		if ((fk = f.key) instanceof TreeBin) {
1740	<	TreeBin t = (TreeBin)fk;
1740	>	TreeBin<V> t = (TreeBin<V>)fk;
1741		boolean validated = false;
1742		t.acquire(0);
1743		try {
1744		if (tabAt(tab, i) == f) {
1745		validated = true;
1746	<	TreeNode p = t.getTreeNode(h, k, t.root);
1746	>	TreeNode<V> p = t.getTreeNode(h, k, t.root);
1747		if (p != null)
1748		p.val = v;
1749		else {
#	Line 1748 | Line 1758 | public class ConcurrentHashMapV8<K, V>
1758		break;
1759		}
1760		else
1761	<	tab = (Node[])fk;
1761	>	tab = (Node<V>[])fk;
1762		}
1763	<	else if ((fh & LOCKED) != 0) {
1764	<	counter.add(delta);
1765	<	delta = 0L;
1756	<	checkForResize();
1757	<	f.tryAwaitLock(tab, i);
1758	<	}
1759	<	else if (f.casHash(fh, fh | LOCKED)) {
1760	<	int count = 0;
1761	<	try {
1763	>	else {
1764	>	int len = 0;
1765	>	synchronized (f) {
1766		if (tabAt(tab, i) == f) {
1767	<	count = 1;
1768	<	for (Node e = f;; ++count) {
1769	<	Object ek, ev;
1770	<	if ((e.hash & HASH_BITS) == h &&
1767	>	len = 1;
1768	>	for (Node<V> e = f;; ++len) {
1769	>	Object ek; V ev;
1770	>	if (e.hash == h &&
1771		(ev = e.val) != null &&
1772		((ek = e.key) == k || k.equals(ek))) {
1773		e.val = v;
1774		break;
1775		}
1776	<	Node last = e;
1776	>	Node<V> last = e;
1777		if ((e = e.next) == null) {
1778		++delta;
1779	<	last.next = new Node(h, k, v, null);
1780	<	if (count >= TREE_THRESHOLD)
1779	>	last.next = new Node<V>(h, k, v, null);
1780	>	if (len >= TREE_THRESHOLD)
1781		replaceWithTreeBin(tab, i, k);
1782		break;
1783		}
1784		}
1785		}
1782	–	} finally {
1783	–	if (!f.casHash(fh | LOCKED, fh)) {
1784	–	f.hash = fh;
1785	–	synchronized (f) { f.notifyAll(); };
1786	–	}
1786		}
1787	<	if (count != 0) {
1788	<	if (count > 1) {
1789	<	counter.add(delta);
1791	<	delta = 0L;
1792	<	checkForResize();
1793	<	}
1787	>	if (len != 0) {
1788	>	if (len > 1)
1789	>	addCount(delta, len);
1790		break;
1791		}
1792		}
1793		}
1794		}
1795		} finally {
1796	<	if (delta != 0)
1797	<	counter.add(delta);
1796	>	if (delta != 0L)
1797	>	addCount(delta, 2);
1798		}
1799		if (npe)
1800		throw new NullPointerException();
1801		}
1802
1803	+	/**
1804	+	* Implementation for clear. Steps through each bin, removing all
1805	+	* nodes.
1806	+	*/
1807	+	@SuppressWarnings("unchecked") private final void internalClear() {
1808	+	long delta = 0L; // negative number of deletions
1809	+	int i = 0;
1810	+	Node<V>[] tab = table;
1811	+	while (tab != null && i < tab.length) {
1812	+	Node<V> f = tabAt(tab, i);
1813	+	if (f == null)
1814	+	++i;
1815	+	else if (f.hash < 0) {
1816	+	Object fk;
1817	+	if ((fk = f.key) instanceof TreeBin) {
1818	+	TreeBin<V> t = (TreeBin<V>)fk;
1819	+	t.acquire(0);
1820	+	try {
1821	+	if (tabAt(tab, i) == f) {
1822	+	for (Node<V> p = t.first; p != null; p = p.next) {
1823	+	if (p.val != null) { // (currently always true)
1824	+	p.val = null;
1825	+	--delta;
1826	+	}
1827	+	}
1828	+	t.first = null;
1829	+	t.root = null;
1830	+	++i;
1831	+	}
1832	+	} finally {
1833	+	t.release(0);
1834	+	}
1835	+	}
1836	+	else
1837	+	tab = (Node<V>[])fk;
1838	+	}
1839	+	else {
1840	+	synchronized (f) {
1841	+	if (tabAt(tab, i) == f) {
1842	+	for (Node<V> e = f; e != null; e = e.next) {
1843	+	if (e.val != null) {  // (currently always true)
1844	+	e.val = null;
1845	+	--delta;
1846	+	}
1847	+	}
1848	+	setTabAt(tab, i, null);
1849	+	++i;
1850	+	}
1851	+	}
1852	+	}
1853	+	}
1854	+	if (delta != 0L)
1855	+	addCount(delta, -1);
1856	+	}
1857	+
1858		/* ---------------- Table Initialization and Resizing -------------- */
1859
1860		/**
#	Line 1823 | Line 1874 | public class ConcurrentHashMapV8<K, V>
1874		/**
1875		* Initializes table, using the size recorded in sizeCtl.
1876		*/
1877	<	private final Node[] initTable() {
1878	<	Node[] tab; int sc;
1877	>	@SuppressWarnings("unchecked") private final Node<V>[] initTable() {
1878	>	Node<V>[] tab; int sc;
1879		while ((tab = table) == null) {
1880		if ((sc = sizeCtl) < 0)
1881		Thread.yield(); // lost initialization race; just spin
1882	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1882	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
1883		try {
1884		if ((tab = table) == null) {
1885		int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
1886	<	tab = table = new Node[n];
1886	>	@SuppressWarnings("rawtypes") Node[] tb = new Node[n];
1887	>	table = tab = (Node<V>[])tb;
1888		sc = n - (n >>> 2);
1889		}
1890		} finally {
#	Line 1845 | Line 1897 | public class ConcurrentHashMapV8<K, V>
1897		}
1898
1899		/**
1900	<	* If table is too small and not already resizing, creates next
1901	<	* table and transfers bins.  Rechecks occupancy after a transfer
1902	<	* to see if another resize is already needed because resizings
1903	<	* are lagging additions.
1904	<	*/
1905	<	private final void checkForResize() {
1906	<	Node[] tab; int n, sc;
1907	<	while ((tab = table) != null &&
1908	<	(n = tab.length) < MAXIMUM_CAPACITY &&
1909	<	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
1910	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1911	<	try {
1912	<	if (tab == table) {
1913	<	table = rebuild(tab);
1914	<	sc = (n << 1) - (n >>> 1);
1900	>	* Adds to count, and if table is too small and not already
1901	>	* resizing, initiates transfer. If already resizing, helps
1902	>	* perform transfer if work is available.  Rechecks occupancy
1903	>	* after a transfer to see if another resize is already needed
1904	>	* because resizings are lagging additions.
1905	>	*
1906	>	* @param x the count to add
1907	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
1908	>	*/
1909	>	private final void addCount(long x, int check) {
1910	>	CounterCell[] as; long b, s;
1911	>	if ((as = counterCells) != null ||
1912	>	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
1913	>	CounterHashCode hc; CounterCell a; long v; int m;
1914	>	boolean uncontended = true;
1915	>	if ((hc = threadCounterHashCode.get()) == null ||
1916	>	as == null || (m = as.length - 1) < 0 ||
1917	>	(a = as[m & hc.code]) == null ||
1918	>	!(uncontended =
1919	>	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
1920	>	fullAddCount(x, hc, uncontended);
1921	>	return;
1922	>	}
1923	>	if (check <= 1)
1924	>	return;
1925	>	s = sumCount();
1926	>	}
1927	>	if (check >= 0) {
1928	>	Node<V>[] tab, nt; int sc;
1929	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
1930	>	tab.length < MAXIMUM_CAPACITY) {
1931	>	if (sc < 0) {
1932	>	if (sc == -1 || transferIndex <= transferOrigin ||
1933	>	(nt = nextTable) == null)
1934	>	break;
1935	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
1936	>	transfer(tab, nt);
1937		}
1938	<	} finally {
1939	<	sizeCtl = sc;
1938	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -2))
1939	>	transfer(tab, null);
1940	>	s = sumCount();
1941		}
1942		}
1943		}
#	Line 1872 | Line 1947 | public class ConcurrentHashMapV8<K, V>
1947		*
1948		* @param size number of elements (doesn't need to be perfectly accurate)
1949		*/
1950	<	private final void tryPresize(int size) {
1950	>	@SuppressWarnings("unchecked") private final void tryPresize(int size) {
1951		int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
1952		tableSizeFor(size + (size >>> 1) + 1);
1953		int sc;
1954		while ((sc = sizeCtl) >= 0) {
1955	<	Node[] tab = table; int n;
1955	>	Node<V>[] tab = table; int n;
1956		if (tab == null || (n = tab.length) == 0) {
1957		n = (sc > c) ? sc : c;
1958	<	if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1958	>	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
1959		try {
1960		if (table == tab) {
1961	<	table = new Node[n];
1961	>	@SuppressWarnings("rawtypes") Node[] tb = new Node[n];
1962	>	table = (Node<V>[])tb;
1963		sc = n - (n >>> 2);
1964		}
1965		} finally {
#	Line 1893 | Line 1969 | public class ConcurrentHashMapV8<K, V>
1969		}
1970		else if (c <= sc || n >= MAXIMUM_CAPACITY)
1971		break;
1972	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1973	<	try {
1974	<	if (table == tab) {
1899	<	table = rebuild(tab);
1900	<	sc = (n << 1) - (n >>> 1);
1901	<	}
1902	<	} finally {
1903	<	sizeCtl = sc;
1904	<	}
1905	<	}
1972	>	else if (tab == table &&
1973	>	U.compareAndSwapInt(this, SIZECTL, sc, -2))
1974	>	transfer(tab, null);
1975		}
1976		}
1977
1978		/*
1979		* Moves and/or copies the nodes in each bin to new table. See
1980		* above for explanation.
1912	–	*
1913	–	* @return the new table
1981		*/
1982	<	private static final Node[] rebuild(Node[] tab) {
1983	<	int n = tab.length;
1984	<	Node[] nextTab = new Node[n << 1];
1985	<	Node fwd = new Node(MOVED, nextTab, null, null);
1986	<	int[] buffer = null;       // holds bins to revisit; null until needed
1987	<	Node rev = null;           // reverse forwarder; null until needed
1988	<	int nbuffered = 0;         // the number of bins in buffer list
1989	<	int bufferIndex = 0;       // buffer index of current buffered bin
1990	<	int bin = n - 1;           // current non-buffered bin or -1 if none
1991	<
1992	<	for (int i = bin;;) {      // start upwards sweep
1993	<	int fh; Node f;
1994	<	if ((f = tabAt(tab, i)) == null) {
1995	<	if (bin >= 0) {    // no lock needed (or available)
1996	<	if (!casTabAt(tab, i, f, fwd))
1997	<	continue;
1998	<	}
1999	<	else {             // transiently use a locked forwarding node
2000	<	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
2001	<	if (!casTabAt(tab, i, f, g))
2002	<	continue;
1982	>	@SuppressWarnings("unchecked") private final void transfer
1983	>	(Node<V>[] tab, Node<V>[] nextTab) {
1984	>	int n = tab.length, stride;
1985	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
1986	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
1987	>	if (nextTab == null) {            // initiating
1988	>	try {
1989	>	@SuppressWarnings("rawtypes") Node[] tb = new Node[n << 1];
1990	>	nextTab = (Node<V>[])tb;
1991	>	} catch (Throwable ex) {      // try to cope with OOME
1992	>	sizeCtl = Integer.MAX_VALUE;
1993	>	return;
1994	>	}
1995	>	nextTable = nextTab;
1996	>	transferOrigin = n;
1997	>	transferIndex = n;
1998	>	Node<V> rev = new Node<V>(MOVED, tab, null, null);
1999	>	for (int k = n; k > 0;) {    // progressively reveal ready slots
2000	>	int nextk = (k > stride) ? k - stride : 0;
2001	>	for (int m = nextk; m < k; ++m)
2002	>	nextTab[m] = rev;
2003	>	for (int m = n + nextk; m < n + k; ++m)
2004	>	nextTab[m] = rev;
2005	>	U.putOrderedInt(this, TRANSFERORIGIN, k = nextk);
2006	>	}
2007	>	}
2008	>	int nextn = nextTab.length;
2009	>	Node<V> fwd = new Node<V>(MOVED, nextTab, null, null);
2010	>	boolean advance = true;
2011	>	for (int i = 0, bound = 0;;) {
2012	>	int nextIndex, nextBound; Node<V> f; Object fk;
2013	>	while (advance) {
2014	>	if (--i >= bound)
2015	>	advance = false;
2016	>	else if ((nextIndex = transferIndex) <= transferOrigin) {
2017	>	i = -1;
2018	>	advance = false;
2019	>	}
2020	>	else if (U.compareAndSwapInt
2021	>	(this, TRANSFERINDEX, nextIndex,
2022	>	nextBound = (nextIndex > stride ?
2023	>	nextIndex - stride : 0))) {
2024	>	bound = nextBound;
2025	>	i = nextIndex - 1;
2026	>	advance = false;
2027	>	}
2028	>	}
2029	>	if (i < 0 || i >= n || i + n >= nextn) {
2030	>	for (int sc;;) {
2031	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, ++sc)) {
2032	>	if (sc == -1) {
2033	>	nextTable = null;
2034	>	table = nextTab;
2035	>	sizeCtl = (n << 1) - (n >>> 1);
2036	>	}
2037	>	return;
2038	>	}
2039	>	}
2040	>	}
2041	>	else if ((f = tabAt(tab, i)) == null) {
2042	>	if (casTabAt(tab, i, null, fwd)) {
2043		setTabAt(nextTab, i, null);
2044		setTabAt(nextTab, i + n, null);
2045	<	setTabAt(tab, i, fwd);
1939	<	if (!g.casHash(MOVED|LOCKED, MOVED)) {
1940	<	g.hash = MOVED;
1941	<	synchronized (g) { g.notifyAll(); }
1942	<	}
2045	>	advance = true;
2046		}
2047		}
2048	<	else if ((fh = f.hash) == MOVED) {
2049	<	Object fk = f.key;
2050	<	if (fk instanceof TreeBin) {
2051	<	TreeBin t = (TreeBin)fk;
2052	<	boolean validated = false;
2053	<	t.acquire(0);
2054	<	try {
2055	<	if (tabAt(tab, i) == f) {
2056	<	validated = true;
2057	<	splitTreeBin(nextTab, i, t);
2058	<	setTabAt(tab, i, fwd);
2048	>	else if (f.hash >= 0) {
2049	>	synchronized (f) {
2050	>	if (tabAt(tab, i) == f) {
2051	>	int runBit = f.hash & n;
2052	>	Node<V> lastRun = f, lo = null, hi = null;
2053	>	for (Node<V> p = f.next; p != null; p = p.next) {
2054	>	int b = p.hash & n;
2055	>	if (b != runBit) {
2056	>	runBit = b;
2057	>	lastRun = p;
2058	>	}
2059		}
2060	<	} finally {
2061	<	t.release(0);
2060	>	if (runBit == 0)
2061	>	lo = lastRun;
2062	>	else
2063	>	hi = lastRun;
2064	>	for (Node<V> p = f; p != lastRun; p = p.next) {
2065	>	int ph = p.hash;
2066	>	Object pk = p.key; V pv = p.val;
2067	>	if ((ph & n) == 0)
2068	>	lo = new Node<V>(ph, pk, pv, lo);
2069	>	else
2070	>	hi = new Node<V>(ph, pk, pv, hi);
2071	>	}
2072	>	setTabAt(nextTab, i, lo);
2073	>	setTabAt(nextTab, i + n, hi);
2074	>	setTabAt(tab, i, fwd);
2075	>	advance = true;
2076		}
1960	–	if (!validated)
1961	–	continue;
2077		}
2078		}
2079	<	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
2080	<	boolean validated = false;
2081	<	try {              // split to lo and hi lists; copying as needed
2079	>	else if ((fk = f.key) instanceof TreeBin) {
2080	>	TreeBin<V> t = (TreeBin<V>)fk;
2081	>	t.acquire(0);
2082	>	try {
2083		if (tabAt(tab, i) == f) {
2084	<	validated = true;
2085	<	splitBin(nextTab, i, f);
2084	>	TreeBin<V> lt = new TreeBin<V>();
2085	>	TreeBin<V> ht = new TreeBin<V>();
2086	>	int lc = 0, hc = 0;
2087	>	for (Node<V> e = t.first; e != null; e = e.next) {
2088	>	int h = e.hash;
2089	>	Object k = e.key; V v = e.val;
2090	>	if ((h & n) == 0) {
2091	>	++lc;
2092	>	lt.putTreeNode(h, k, v);
2093	>	}
2094	>	else {
2095	>	++hc;
2096	>	ht.putTreeNode(h, k, v);
2097	>	}
2098	>	}
2099	>	Node<V> ln, hn; // throw away trees if too small
2100	>	if (lc < TREE_THRESHOLD) {
2101	>	ln = null;
2102	>	for (Node<V> p = lt.first; p != null; p = p.next)
2103	>	ln = new Node<V>(p.hash, p.key, p.val, ln);
2104	>	}
2105	>	else
2106	>	ln = new Node<V>(MOVED, lt, null, null);
2107	>	setTabAt(nextTab, i, ln);
2108	>	if (hc < TREE_THRESHOLD) {
2109	>	hn = null;
2110	>	for (Node<V> p = ht.first; p != null; p = p.next)
2111	>	hn = new Node<V>(p.hash, p.key, p.val, hn);
2112	>	}
2113	>	else
2114	>	hn = new Node<V>(MOVED, ht, null, null);
2115	>	setTabAt(nextTab, i + n, hn);
2116		setTabAt(tab, i, fwd);
2117	+	advance = true;
2118		}
2119		} finally {
2120	<	if (!f.casHash(fh | LOCKED, fh)) {
1974	<	f.hash = fh;
1975	<	synchronized (f) { f.notifyAll(); };
1976	<	}
2120	>	t.release(0);
2121		}
1978	–	if (!validated)
1979	–	continue;
1980	–	}
1981	–	else {
1982	–	if (buffer == null) // initialize buffer for revisits
1983	–	buffer = new int[TRANSFER_BUFFER_SIZE];
1984	–	if (bin < 0 && bufferIndex > 0) {
1985	–	int j = buffer[--bufferIndex];
1986	–	buffer[bufferIndex] = i;
1987	–	i = j;         // swap with another bin
1988	–	continue;
1989	–	}
1990	–	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
1991	–	f.tryAwaitLock(tab, i);
1992	–	continue;      // no other options -- block
1993	–	}
1994	–	if (rev == null)   // initialize reverse-forwarder
1995	–	rev = new Node(MOVED, tab, null, null);
1996	–	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
1997	–	continue;      // recheck before adding to list
1998	–	buffer[nbuffered++] = i;
1999	–	setTabAt(nextTab, i, rev);     // install place-holders
2000	–	setTabAt(nextTab, i + n, rev);
2001	–	}
2002	–
2003	–	if (bin > 0)
2004	–	i = --bin;
2005	–	else if (buffer != null && nbuffered > 0) {
2006	–	bin = -1;
2007	–	i = buffer[bufferIndex = --nbuffered];
2122		}
2123		else
2124	<	return nextTab;
2124	>	advance = true; // already processed
2125		}
2126		}
2127
2128	<	/**
2129	<	* Split a normal bin with list headed by e into lo and hi parts;
2130	<	* install in given table
2131	<	*/
2132	<	private static void splitBin(Node[] nextTab, int i, Node e) {
2133	<	int bit = nextTab.length >>> 1; // bit to split on
2134	<	int runBit = e.hash & bit;
2135	<	Node lastRun = e, lo = null, hi = null;
2136	<	for (Node p = e.next; p != null; p = p.next) {
2023	<	int b = p.hash & bit;
2024	<	if (b != runBit) {
2025	<	runBit = b;
2026	<	lastRun = p;
2128	>	/* ---------------- Counter support -------------- */
2129	>
2130	>	final long sumCount() {
2131	>	CounterCell[] as = counterCells; CounterCell a;
2132	>	long sum = baseCount;
2133	>	if (as != null) {
2134	>	for (int i = 0; i < as.length; ++i) {
2135	>	if ((a = as[i]) != null)
2136	>	sum += a.value;
2137		}
2138		}
2139	<	if (runBit == 0)
2030	<	lo = lastRun;
2031	<	else
2032	<	hi = lastRun;
2033	<	for (Node p = e; p != lastRun; p = p.next) {
2034	<	int ph = p.hash & HASH_BITS;
2035	<	Object pk = p.key, pv = p.val;
2036	<	if ((ph & bit) == 0)
2037	<	lo = new Node(ph, pk, pv, lo);
2038	<	else
2039	<	hi = new Node(ph, pk, pv, hi);
2040	<	}
2041	<	setTabAt(nextTab, i, lo);
2042	<	setTabAt(nextTab, i + bit, hi);
2139	>	return sum;
2140		}
2141
2142	<	/**
2143	<	* Split a tree bin into lo and hi parts; install in given table
2144	<	*/
2145	<	private static void splitTreeBin(Node[] nextTab, int i, TreeBin t) {
2146	<	int bit = nextTab.length >>> 1;
2147	<	TreeBin lt = new TreeBin();
2148	<	TreeBin ht = new TreeBin();
2149	<	int lc = 0, hc = 0;
2150	<	for (Node e = t.first; e != null; e = e.next) {
2054	<	int h = e.hash & HASH_BITS;
2055	<	Object k = e.key, v = e.val;
2056	<	if ((h & bit) == 0) {
2057	<	++lc;
2058	<	lt.putTreeNode(h, k, v);
2059	<	}
2060	<	else {
2061	<	++hc;
2062	<	ht.putTreeNode(h, k, v);
2063	<	}
2064	<	}
2065	<	Node ln, hn; // throw away trees if too small
2066	<	if (lc <= (TREE_THRESHOLD >>> 1)) {
2067	<	ln = null;
2068	<	for (Node p = lt.first; p != null; p = p.next)
2069	<	ln = new Node(p.hash, p.key, p.val, ln);
2070	<	}
2071	<	else
2072	<	ln = new Node(MOVED, lt, null, null);
2073	<	setTabAt(nextTab, i, ln);
2074	<	if (hc <= (TREE_THRESHOLD >>> 1)) {
2075	<	hn = null;
2076	<	for (Node p = ht.first; p != null; p = p.next)
2077	<	hn = new Node(p.hash, p.key, p.val, hn);
2142	>	// See LongAdder version for explanation
2143	>	private final void fullAddCount(long x, CounterHashCode hc,
2144	>	boolean wasUncontended) {
2145	>	int h;
2146	>	if (hc == null) {
2147	>	hc = new CounterHashCode();
2148	>	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
2149	>	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
2150	>	threadCounterHashCode.set(hc);
2151		}
2152		else
2153	<	hn = new Node(MOVED, ht, null, null);
2154	<	setTabAt(nextTab, i + bit, hn);
2155	<	}
2156	<
2157	<	/**
2158	<	* Implementation for clear. Steps through each bin, removing all
2159	<	* nodes.
2160	<	*/
2161	<	private final void internalClear() {
2162	<	long delta = 0L; // negative number of deletions
2163	<	int i = 0;
2164	<	Node[] tab = table;
2165	<	while (tab != null && i < tab.length) {
2166	<	int fh; Object fk;
2167	<	Node f = tabAt(tab, i);
2168	<	if (f == null)
2169	<	++i;
2170	<	else if ((fh = f.hash) == MOVED) {
2171	<	if ((fk = f.key) instanceof TreeBin) {
2172	<	TreeBin t = (TreeBin)fk;
2173	<	t.acquire(0);
2101	<	try {
2102	<	if (tabAt(tab, i) == f) {
2103	<	for (Node p = t.first; p != null; p = p.next) {
2104	<	p.val = null;
2105	<	--delta;
2153	>	h = hc.code;
2154	>	boolean collide = false;                // True if last slot nonempty
2155	>	for (;;) {
2156	>	CounterCell[] as; CounterCell a; int n; long v;
2157	>	if ((as = counterCells) != null && (n = as.length) > 0) {
2158	>	if ((a = as[(n - 1) & h]) == null) {
2159	>	if (counterBusy == 0) {            // Try to attach new Cell
2160	>	CounterCell r = new CounterCell(x); // Optimistic create
2161	>	if (counterBusy == 0 &&
2162	>	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2163	>	boolean created = false;
2164	>	try {               // Recheck under lock
2165	>	CounterCell[] rs; int m, j;
2166	>	if ((rs = counterCells) != null &&
2167	>	(m = rs.length) > 0 &&
2168	>	rs[j = (m - 1) & h] == null) {
2169	>	rs[j] = r;
2170	>	created = true;
2171	>	}
2172	>	} finally {
2173	>	counterBusy = 0;
2174		}
2175	<	t.first = null;
2176	<	t.root = null;
2177	<	++i;
2175	>	if (created)
2176	>	break;
2177	>	continue;           // Slot is now non-empty
2178		}
2111	–	} finally {
2112	–	t.release(0);
2179		}
2180	+	collide = false;
2181		}
2182	<	else
2183	<	tab = (Node[])fk;
2184	<	}
2185	<	else if ((fh & LOCKED) != 0) {
2186	<	counter.add(delta); // opportunistically update count
2187	<	delta = 0L;
2188	<	f.tryAwaitLock(tab, i);
2189	<	}
2190	<	else if (f.casHash(fh, fh | LOCKED)) {
2191	<	try {
2192	<	if (tabAt(tab, i) == f) {
2193	<	for (Node e = f; e != null; e = e.next) {
2194	<	e.val = null;
2195	<	--delta;
2182	>	else if (!wasUncontended)       // CAS already known to fail
2183	>	wasUncontended = true;      // Continue after rehash
2184	>	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
2185	>	break;
2186	>	else if (counterCells != as || n >= NCPU)
2187	>	collide = false;            // At max size or stale
2188	>	else if (!collide)
2189	>	collide = true;
2190	>	else if (counterBusy == 0 &&
2191	>	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2192	>	try {
2193	>	if (counterCells == as) {// Expand table unless stale
2194	>	CounterCell[] rs = new CounterCell[n << 1];
2195	>	for (int i = 0; i < n; ++i)
2196	>	rs[i] = as[i];
2197	>	counterCells = rs;
2198		}
2199	<	setTabAt(tab, i, null);
2200	<	++i;
2199	>	} finally {
2200	>	counterBusy = 0;
2201		}
2202	<	} finally {
2203	<	if (!f.casHash(fh | LOCKED, fh)) {
2204	<	f.hash = fh;
2205	<	synchronized (f) { f.notifyAll(); };
2202	>	collide = false;
2203	>	continue;                   // Retry with expanded table
2204	>	}
2205	>	h ^= h << 13;                   // Rehash
2206	>	h ^= h >>> 17;
2207	>	h ^= h << 5;
2208	>	}
2209	>	else if (counterBusy == 0 && counterCells == as &&
2210	>	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2211	>	boolean init = false;
2212	>	try {                           // Initialize table
2213	>	if (counterCells == as) {
2214	>	CounterCell[] rs = new CounterCell[2];
2215	>	rs[h & 1] = new CounterCell(x);
2216	>	counterCells = rs;
2217	>	init = true;
2218		}
2219	+	} finally {
2220	+	counterBusy = 0;
2221		}
2222	+	if (init)
2223	+	break;
2224		}
2225	+	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
2226	+	break;                          // Fall back on using base
2227		}
2228	<	if (delta != 0)
2142	<	counter.add(delta);
2228	>	hc.code = h;                            // Record index for next time
2229		}
2230
2231		/* ----------------Table Traversal -------------- */
2232
2233		/**
2234		* Encapsulates traversal for methods such as containsValue; also
2235	<	* serves as a base class for other iterators.
2235	>	* serves as a base class for other iterators and bulk tasks.
2236		*
2237		* At each step, the iterator snapshots the key ("nextKey") and
2238		* value ("nextVal") of a valid node (i.e., one that, at point of
#	Line 2154 | Line 2240 | public class ConcurrentHashMapV8<K, V>
2240		* change (including to null, indicating deletion), field nextVal
2241		* might not be accurate at point of use, but still maintains the
2242		* weak consistency property of holding a value that was once
2243	<	* valid.
2243	>	* valid. To support iterator.remove, the nextKey field is not
2244	>	* updated (nulled out) when the iterator cannot advance.
2245		*
2246		* Internal traversals directly access these fields, as in:
2247		* {@code while (it.advance() != null) { process(it.nextKey); }}
#	Line 2180 | Line 2267 | public class ConcurrentHashMapV8<K, V>
2267		* paranoically cope with potential sharing by users of iterators
2268		* across threads, iteration terminates if a bounds checks fails
2269		* for a table read.
2270	+	*
2271	+	* This class extends CountedCompleter to streamline parallel
2272	+	* iteration in bulk operations. This adds only a few fields of
2273	+	* space overhead, which is small enough in cases where it is not
2274	+	* needed to not worry about it.  Because CountedCompleter is
2275	+	* Serializable, but iterators need not be, we need to add warning
2276	+	* suppressions.
2277		*/
2278	<	static class InternalIterator<K,V> {
2278	>	@SuppressWarnings("serial") static class Traverser<K,V,R>
2279	>	extends CountedCompleter<R> {
2280		final ConcurrentHashMapV8<K, V> map;
2281	<	Node next;           // the next entry to use
2187	<	Node last;           // the last entry used
2281	>	Node<V> next;        // the next entry to use
2282		Object nextKey;      // cached key field of next
2283	<	Object nextVal;      // cached val field of next
2284	<	Node[] tab;          // current table; updated if resized
2283	>	V nextVal;           // cached val field of next
2284	>	Node<V>[] tab;       // current table; updated if resized
2285		int index;           // index of bin to use next
2286		int baseIndex;       // current index of initial table
2287		int baseLimit;       // index bound for initial table
2288	<	final int baseSize;  // initial table size
2288	>	int baseSize;        // initial table size
2289	>	int batch;           // split control
2290
2291		/** Creates iterator for all entries in the table. */
2292	<	InternalIterator(ConcurrentHashMapV8<K, V> map) {
2293	<	this.tab = (this.map = map).table;
2199	<	baseLimit = baseSize = (tab == null) ? 0 : tab.length;
2292	>	Traverser(ConcurrentHashMapV8<K, V> map) {
2293	>	this.map = map;
2294		}
2295
2296	<	/** Creates iterator for clone() and split() methods */
2297	<	InternalIterator(InternalIterator<K,V> it, boolean split) {
2298	<	this.map = it.map;
2299	<	this.tab = it.tab;
2300	<	this.baseSize = it.baseSize;
2301	<	int lo = it.baseIndex;
2302	<	int hi = this.baseLimit = it.baseLimit;
2303	<	this.index = this.baseIndex =
2304	<	(split) ? (it.baseLimit = (lo + hi + 1) >>> 1) : lo;
2296	>	/** Creates iterator for split() methods and task constructors */
2297	>	Traverser(ConcurrentHashMapV8<K,V> map, Traverser<K,V,?> it, int batch) {
2298	>	super(it);
2299	>	this.batch = batch;
2300	>	if ((this.map = map) != null && it != null) { // split parent
2301	>	Node<V>[] t;
2302	>	if ((t = it.tab) == null &&
2303	>	(t = it.tab = map.table) != null)
2304	>	it.baseLimit = it.baseSize = t.length;
2305	>	this.tab = t;
2306	>	this.baseSize = it.baseSize;
2307	>	int hi = this.baseLimit = it.baseLimit;
2308	>	it.baseLimit = this.index = this.baseIndex =
2309	>	(hi + it.baseIndex + 1) >>> 1;
2310	>	}
2311		}
2312
2313		/**
2314	<	* Advances next; returns nextVal or null if terminated
2314	>	* Advances next; returns nextVal or null if terminated.
2315		* See above for explanation.
2316		*/
2317	<	final Object advance() {
2318	<	Node e = last = next;
2319	<	Object ev = null;
2317	>	@SuppressWarnings("unchecked") final V advance() {
2318	>	Node<V> e = next;
2319	>	V ev = null;
2320		outer: do {
2321		if (e != null)                  // advance past used/skipped node
2322		e = e.next;
2323		while (e == null) {             // get to next non-null bin
2324	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2325	<	if ((b = baseIndex) >= baseLimit || (i = index) < 0 ||
2326	<	(t = tab) == null || i >= (n = t.length))
2324	>	ConcurrentHashMapV8<K, V> m;
2325	>	Node<V>[] t; int b, i, n; Object ek; //  must use locals
2326	>	if ((t = tab) != null)
2327	>	n = t.length;
2328	>	else if ((m = map) != null && (t = tab = m.table) != null)
2329	>	n = baseLimit = baseSize = t.length;
2330	>	else
2331	>	break outer;
2332	>	if ((b = baseIndex) >= baseLimit ||
2333	>	(i = index) < 0 || i >= n)
2334		break outer;
2335	<	else if ((e = tabAt(t, i)) != null && e.hash == MOVED) {
2335	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
2336		if ((ek = e.key) instanceof TreeBin)
2337	<	e = ((TreeBin)ek).first;
2337	>	e = ((TreeBin<V>)ek).first;
2338		else {
2339	<	tab = (Node[])ek;
2339	>	tab = (Node<V>[])ek;
2340		continue;           // restarts due to null val
2341		}
2342		}                           // visit upper slots if present
#	Line 2242 | Line 2349 | public class ConcurrentHashMapV8<K, V>
2349		}
2350
2351		public final void remove() {
2352	<	if (nextVal == null)
2353	<	advance();
2247	<	Node e = last;
2248	<	if (e == null)
2352	>	Object k = nextKey;
2353	>	if (k == null && (advance() == null || (k = nextKey) == null))
2354		throw new IllegalStateException();
2355	<	last = null;
2251	<	map.remove(e.key);
2355	>	map.internalReplace(k, null, null);
2356		}
2357
2358		public final boolean hasNext() {
#	Line 2256 | Line 2360 | public class ConcurrentHashMapV8<K, V>
2360		}
2361
2362		public final boolean hasMoreElements() { return hasNext(); }
2363	+
2364	+	public void compute() { } // default no-op CountedCompleter body
2365	+
2366	+	/**
2367	+	* Returns a batch value > 0 if this task should (and must) be
2368	+	* split, if so, adding to pending count, and in any case
2369	+	* updating batch value. The initial batch value is approx
2370	+	* exp2 of the number of times (minus one) to split task by
2371	+	* two before executing leaf action. This value is faster to
2372	+	* compute and more convenient to use as a guide to splitting
2373	+	* than is the depth, since it is used while dividing by two
2374	+	* anyway.
2375	+	*/
2376	+	final int preSplit() {
2377	+	ConcurrentHashMapV8<K, V> m; int b; Node<V>[] t;  ForkJoinPool pool;
2378	+	if ((b = batch) < 0 && (m = map) != null) { // force initialization
2379	+	if ((t = tab) == null && (t = tab = m.table) != null)
2380	+	baseLimit = baseSize = t.length;
2381	+	if (t != null) {
2382	+	long n = m.sumCount();
2383	+	int par = ((pool = getPool()) == null) ?
2384	+	ForkJoinPool.getCommonPoolParallelism() :
2385	+	pool.getParallelism();
2386	+	int sp = par << 3; // slack of 8
2387	+	b = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
2388	+	}
2389	+	}
2390	+	b = (b <= 1 || baseIndex == baseLimit) ? 0 : (b >>> 1);
2391	+	if ((batch = b) > 0)
2392	+	addToPendingCount(1);
2393	+	return b;
2394	+	}
2395	+
2396		}
2397
2398		/* ---------------- Public operations -------------- */
2399
2400		/**
2401	<	* Creates a new, empty map with the default initial table size (16),
2401	>	* Creates a new, empty map with the default initial table size (16).
2402		*/
2403		public ConcurrentHashMapV8() {
2267	–	this.counter = new LongAdder();
2404		}
2405
2406		/**
#	Line 2283 | Line 2419 | public class ConcurrentHashMapV8<K, V>
2419		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
2420		MAXIMUM_CAPACITY :
2421		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2286	–	this.counter = new LongAdder();
2422		this.sizeCtl = cap;
2423		}
2424
#	Line 2293 | Line 2428 | public class ConcurrentHashMapV8<K, V>
2428		* @param m the map
2429		*/
2430		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2296	–	this.counter = new LongAdder();
2431		this.sizeCtl = DEFAULT_CAPACITY;
2432		internalPutAll(m);
2433		}
#	Line 2342 | Line 2476 | public class ConcurrentHashMapV8<K, V>
2476		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
2477		initialCapacity = concurrencyLevel;   // as estimated threads
2478		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
2479	<	int cap = ((size >= (long)MAXIMUM_CAPACITY) ?
2480	<	MAXIMUM_CAPACITY: tableSizeFor((int)size));
2347	<	this.counter = new LongAdder();
2479	>	int cap = (size >= (long)MAXIMUM_CAPACITY) ?
2480	>	MAXIMUM_CAPACITY : tableSizeFor((int)size);
2481		this.sizeCtl = cap;
2482		}
2483
2484		/**
2485	+	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2486	+	* from the given type to {@code Boolean.TRUE}.
2487	+	*
2488	+	* @return the new set
2489	+	*/
2490	+	public static <K> KeySetView<K,Boolean> newKeySet() {
2491	+	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(),
2492	+	Boolean.TRUE);
2493	+	}
2494	+
2495	+	/**
2496	+	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2497	+	* from the given type to {@code Boolean.TRUE}.
2498	+	*
2499	+	* @param initialCapacity The implementation performs internal
2500	+	* sizing to accommodate this many elements.
2501	+	* @throws IllegalArgumentException if the initial capacity of
2502	+	* elements is negative
2503	+	* @return the new set
2504	+	*/
2505	+	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2506	+	return new KeySetView<K,Boolean>
2507	+	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2508	+	}
2509	+
2510	+	/**
2511		* {@inheritDoc}
2512		*/
2513		public boolean isEmpty() {
2514	<	return counter.sum() <= 0L; // ignore transient negative values
2514	>	return sumCount() <= 0L; // ignore transient negative values
2515		}
2516
2517		/**
2518		* {@inheritDoc}
2519		*/
2520		public int size() {
2521	<	long n = counter.sum();
2521	>	long n = sumCount();
2522		return ((n < 0L) ? 0 :
2523		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
2524		(int)n);
2525		}
2526
2527	<	final long longSize() { // accurate version of size needed for views
2528	<	long n = counter.sum();
2529	<	return (n < 0L) ? 0L : n;
2527	>	/**
2528	>	* Returns the number of mappings. This method should be used
2529	>	* instead of {@link #size} because a ConcurrentHashMapV8 may
2530	>	* contain more mappings than can be represented as an int. The
2531	>	* value returned is an estimate; the actual count may differ if
2532	>	* there are concurrent insertions or removals.
2533	>	*
2534	>	* @return the number of mappings
2535	>	*/
2536	>	public long mappingCount() {
2537	>	long n = sumCount();
2538	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2539		}
2540
2541		/**
#	Line 2381 | Line 2549 | public class ConcurrentHashMapV8<K, V>
2549		*
2550		* @throws NullPointerException if the specified key is null
2551		*/
2384	–	@SuppressWarnings("unchecked")
2552		public V get(Object key) {
2553	<	if (key == null)
2554	<	throw new NullPointerException();
2555	<	return (V)internalGet(key);
2553	>	return internalGet(key);
2554	>	}
2555	>
2556	>	/**
2557	>	* Returns the value to which the specified key is mapped,
2558	>	* or the given defaultValue if this map contains no mapping for the key.
2559	>	*
2560	>	* @param key the key
2561	>	* @param defaultValue the value to return if this map contains
2562	>	* no mapping for the given key
2563	>	* @return the mapping for the key, if present; else the defaultValue
2564	>	* @throws NullPointerException if the specified key is null
2565	>	*/
2566	>	public V getValueOrDefault(Object key, V defaultValue) {
2567	>	V v;
2568	>	return (v = internalGet(key)) == null ? defaultValue : v;
2569		}
2570
2571		/**
#	Line 2398 | Line 2578 | public class ConcurrentHashMapV8<K, V>
2578		* @throws NullPointerException if the specified key is null
2579		*/
2580		public boolean containsKey(Object key) {
2401	–	if (key == null)
2402	–	throw new NullPointerException();
2581		return internalGet(key) != null;
2582		}
2583
#	Line 2416 | Line 2594 | public class ConcurrentHashMapV8<K, V>
2594		public boolean containsValue(Object value) {
2595		if (value == null)
2596		throw new NullPointerException();
2597	<	Object v;
2598	<	InternalIterator<K,V> it = new InternalIterator<K,V>(this);
2597	>	V v;
2598	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2599		while ((v = it.advance()) != null) {
2600		if (v == value || value.equals(v))
2601		return true;
#	Line 2440 | Line 2618 | public class ConcurrentHashMapV8<K, V>
2618		*         {@code false} otherwise
2619		* @throws NullPointerException if the specified value is null
2620		*/
2621	<	public boolean contains(Object value) {
2621	>	@Deprecated public boolean contains(Object value) {
2622		return containsValue(value);
2623		}
2624
#	Line 2448 | Line 2626 | public class ConcurrentHashMapV8<K, V>
2626		* Maps the specified key to the specified value in this table.
2627		* Neither the key nor the value can be null.
2628		*
2629	<	* <p> The value can be retrieved by calling the {@code get} method
2629	>	* <p>The value can be retrieved by calling the {@code get} method
2630		* with a key that is equal to the original key.
2631		*
2632		* @param key key with which the specified value is to be associated
#	Line 2457 | Line 2635 | public class ConcurrentHashMapV8<K, V>
2635		*         {@code null} if there was no mapping for {@code key}
2636		* @throws NullPointerException if the specified key or value is null
2637		*/
2460	–	@SuppressWarnings("unchecked")
2638		public V put(K key, V value) {
2639	<	if (key == null || value == null)
2463	<	throw new NullPointerException();
2464	<	return (V)internalPut(key, value);
2639	>	return internalPut(key, value, false);
2640		}
2641
2642		/**
#	Line 2471 | Line 2646 | public class ConcurrentHashMapV8<K, V>
2646		*         or {@code null} if there was no mapping for the key
2647		* @throws NullPointerException if the specified key or value is null
2648		*/
2474	–	@SuppressWarnings("unchecked")
2649		public V putIfAbsent(K key, V value) {
2650	<	if (key == null || value == null)
2477	<	throw new NullPointerException();
2478	<	return (V)internalPutIfAbsent(key, value);
2650	>	return internalPut(key, value, true);
2651		}
2652
2653		/**
#	Line 2496 | Line 2668 | public class ConcurrentHashMapV8<K, V>
2668		* <pre> {@code
2669		* if (map.containsKey(key))
2670		*   return map.get(key);
2671	<	* value = mappingFunction.map(key);
2671	>	* value = mappingFunction.apply(key);
2672		* if (value != null)
2673		*   map.put(key, value);
2674		* return value;}</pre>
#	Line 2513 | Line 2685 | public class ConcurrentHashMapV8<K, V>
2685		* memoized result, as in:
2686		*
2687		*  <pre> {@code
2688	<	* map.computeIfAbsent(key, new MappingFunction<K, V>() {
2688	>	* map.computeIfAbsent(key, new Fun<K, V>() {
2689		*   public V map(K k) { return new Value(f(k)); }});}</pre>
2690		*
2691		* @param key key with which the specified value is to be associated
2692		* @param mappingFunction the function to compute a value
2693		* @return the current (existing or computed) value associated with
2694	<	*         the specified key, or null if the computed value is null.
2694	>	*         the specified key, or null if the computed value is null
2695		* @throws NullPointerException if the specified key or mappingFunction
2696		*         is null
2697		* @throws IllegalStateException if the computation detectably
#	Line 2528 | Line 2700 | public class ConcurrentHashMapV8<K, V>
2700		* @throws RuntimeException or Error if the mappingFunction does so,
2701		*         in which case the mapping is left unestablished
2702		*/
2703	<	@SuppressWarnings("unchecked")
2704	<	public V computeIfAbsent(K key, MappingFunction<? super K, ? extends V> mappingFunction) {
2705	<	if (key == null || mappingFunction == null)
2706	<	throw new NullPointerException();
2707	<	return (V)internalComputeIfAbsent(key, mappingFunction);
2703	>	public V computeIfAbsent
2704	>	(K key, Fun<? super K, ? extends V> mappingFunction) {
2705	>	return internalComputeIfAbsent(key, mappingFunction);
2706	>	}
2707	>
2708	>	/**
2709	>	* If the given key is present, computes a new mapping value given a key and
2710	>	* its current mapped value. This is equivalent to
2711	>	*  <pre> {@code
2712	>	*   if (map.containsKey(key)) {
2713	>	*     value = remappingFunction.apply(key, map.get(key));
2714	>	*     if (value != null)
2715	>	*       map.put(key, value);
2716	>	*     else
2717	>	*       map.remove(key);
2718	>	*   }
2719	>	* }</pre>
2720	>	*
2721	>	* except that the action is performed atomically.  If the
2722	>	* function returns {@code null}, the mapping is removed.  If the
2723	>	* function itself throws an (unchecked) exception, the exception
2724	>	* is rethrown to its caller, and the current mapping is left
2725	>	* unchanged.  Some attempted update operations on this map by
2726	>	* other threads may be blocked while computation is in progress,
2727	>	* so the computation should be short and simple, and must not
2728	>	* attempt to update any other mappings of this Map. For example,
2729	>	* to either create or append new messages to a value mapping:
2730	>	*
2731	>	* @param key key with which the specified value is to be associated
2732	>	* @param remappingFunction the function to compute a value
2733	>	* @return the new value associated with the specified key, or null if none
2734	>	* @throws NullPointerException if the specified key or remappingFunction
2735	>	*         is null
2736	>	* @throws IllegalStateException if the computation detectably
2737	>	*         attempts a recursive update to this map that would
2738	>	*         otherwise never complete
2739	>	* @throws RuntimeException or Error if the remappingFunction does so,
2740	>	*         in which case the mapping is unchanged
2741	>	*/
2742	>	public V computeIfPresent
2743	>	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2744	>	return internalCompute(key, true, remappingFunction);
2745		}
2746
2747		/**
#	Line 2540 | Line 2749 | public class ConcurrentHashMapV8<K, V>
2749		* its current mapped value (or {@code null} if there is no current
2750		* mapping). This is equivalent to
2751		*  <pre> {@code
2752	<	*   value = remappingFunction.remap(key, map.get(key));
2752	>	*   value = remappingFunction.apply(key, map.get(key));
2753		*   if (value != null)
2754		*     map.put(key, value);
2755		*   else
#	Line 2560 | Line 2769 | public class ConcurrentHashMapV8<K, V>
2769		* <pre> {@code
2770		* Map<Key, String> map = ...;
2771		* final String msg = ...;
2772	<	* map.compute(key, new RemappingFunction<Key, String>() {
2773	<	*   public String remap(Key k, String v) {
2772	>	* map.compute(key, new BiFun<Key, String, String>() {
2773	>	*   public String apply(Key k, String v) {
2774		*    return (v == null) ? msg : v + msg;});}}</pre>
2775		*
2776		* @param key key with which the specified value is to be associated
2777		* @param remappingFunction the function to compute a value
2778	<	* @return the new value associated with
2570	<	*         the specified key, or null if none.
2778	>	* @return the new value associated with the specified key, or null if none
2779		* @throws NullPointerException if the specified key or remappingFunction
2780		*         is null
2781		* @throws IllegalStateException if the computation detectably
#	Line 2576 | Line 2784 | public class ConcurrentHashMapV8<K, V>
2784		* @throws RuntimeException or Error if the remappingFunction does so,
2785		*         in which case the mapping is unchanged
2786		*/
2787	<	@SuppressWarnings("unchecked")
2788	<	public V compute(K key, RemappingFunction<? super K, V> remappingFunction) {
2789	<	if (key == null || remappingFunction == null)
2790	<	throw new NullPointerException();
2791	<	return (V)internalCompute(key, remappingFunction);
2787	>	public V compute
2788	>	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2789	>	return internalCompute(key, false, remappingFunction);
2790	>	}
2791	>
2792	>	/**
2793	>	* If the specified key is not already associated
2794	>	* with a value, associate it with the given value.
2795	>	* Otherwise, replace the value with the results of
2796	>	* the given remapping function. This is equivalent to:
2797	>	*  <pre> {@code
2798	>	*   if (!map.containsKey(key))
2799	>	*     map.put(value);
2800	>	*   else {
2801	>	*     newValue = remappingFunction.apply(map.get(key), value);
2802	>	*     if (value != null)
2803	>	*       map.put(key, value);
2804	>	*     else
2805	>	*       map.remove(key);
2806	>	*   }
2807	>	* }</pre>
2808	>	* except that the action is performed atomically.  If the
2809	>	* function returns {@code null}, the mapping is removed.  If the
2810	>	* function itself throws an (unchecked) exception, the exception
2811	>	* is rethrown to its caller, and the current mapping is left
2812	>	* unchanged.  Some attempted update operations on this map by
2813	>	* other threads may be blocked while computation is in progress,
2814	>	* so the computation should be short and simple, and must not
2815	>	* attempt to update any other mappings of this Map.
2816	>	*/
2817	>	public V merge
2818	>	(K key, V value,
2819	>	BiFun<? super V, ? super V, ? extends V> remappingFunction) {
2820	>	return internalMerge(key, value, remappingFunction);
2821		}
2822
2823		/**
#	Line 2592 | Line 2829 | public class ConcurrentHashMapV8<K, V>
2829		*         {@code null} if there was no mapping for {@code key}
2830		* @throws NullPointerException if the specified key is null
2831		*/
2595	–	@SuppressWarnings("unchecked")
2832		public V remove(Object key) {
2833	<	if (key == null)
2598	<	throw new NullPointerException();
2599	<	return (V)internalReplace(key, null, null);
2833	>	return internalReplace(key, null, null);
2834		}
2835
2836		/**
#	Line 2605 | Line 2839 | public class ConcurrentHashMapV8<K, V>
2839		* @throws NullPointerException if the specified key is null
2840		*/
2841		public boolean remove(Object key, Object value) {
2842	<	if (key == null)
2609	<	throw new NullPointerException();
2610	<	if (value == null)
2611	<	return false;
2612	<	return internalReplace(key, null, value) != null;
2842	>	return value != null && internalReplace(key, null, value) != null;
2843		}
2844
2845		/**
#	Line 2630 | Line 2860 | public class ConcurrentHashMapV8<K, V>
2860		*         or {@code null} if there was no mapping for the key
2861		* @throws NullPointerException if the specified key or value is null
2862		*/
2633	–	@SuppressWarnings("unchecked")
2863		public V replace(K key, V value) {
2864		if (key == null || value == null)
2865		throw new NullPointerException();
2866	<	return (V)internalReplace(key, value, null);
2866	>	return internalReplace(key, value, null);
2867		}
2868
2869		/**
#	Line 2647 | Line 2876 | public class ConcurrentHashMapV8<K, V>
2876		/**
2877		* Returns a {@link Set} view of the keys contained in this map.
2878		* The set is backed by the map, so changes to the map are
2879	<	* reflected in the set, and vice-versa.  The set supports element
2651	<	* removal, which removes the corresponding mapping from this map,
2652	<	* via the {@code Iterator.remove}, {@code Set.remove},
2653	<	* {@code removeAll}, {@code retainAll}, and {@code clear}
2654	<	* operations.  It does not support the {@code add} or
2655	<	* {@code addAll} operations.
2879	>	* reflected in the set, and vice-versa.
2880		*
2881	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
2882	<	* that will never throw {@link ConcurrentModificationException},
2883	<	* and guarantees to traverse elements as they existed upon
2884	<	* construction of the iterator, and may (but is not guaranteed to)
2885	<	* reflect any modifications subsequent to construction.
2881	>	* @return the set view
2882	>	*/
2883	>	public KeySetView<K,V> keySet() {
2884	>	KeySetView<K,V> ks = keySet;
2885	>	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2886	>	}
2887	>
2888	>	/**
2889	>	* Returns a {@link Set} view of the keys in this map, using the
2890	>	* given common mapped value for any additions (i.e., {@link
2891	>	* Collection#add} and {@link Collection#addAll}). This is of
2892	>	* course only appropriate if it is acceptable to use the same
2893	>	* value for all additions from this view.
2894	>	*
2895	>	* @param mappedValue the mapped value to use for any
2896	>	* additions.
2897	>	* @return the set view
2898	>	* @throws NullPointerException if the mappedValue is null
2899		*/
2900	<	public Set<K> keySet() {
2901	<	KeySet<K,V> ks = keySet;
2902	<	return (ks != null) ? ks : (keySet = new KeySet<K,V>(this));
2900	>	public KeySetView<K,V> keySet(V mappedValue) {
2901	>	if (mappedValue == null)
2902	>	throw new NullPointerException();
2903	>	return new KeySetView<K,V>(this, mappedValue);
2904		}
2905
2906		/**
2907		* Returns a {@link Collection} view of the values contained in this map.
2908		* The collection is backed by the map, so changes to the map are
2909	<	* reflected in the collection, and vice-versa.  The collection
2672	<	* supports element removal, which removes the corresponding
2673	<	* mapping from this map, via the {@code Iterator.remove},
2674	<	* {@code Collection.remove}, {@code removeAll},
2675	<	* {@code retainAll}, and {@code clear} operations.  It does not
2676	<	* support the {@code add} or {@code addAll} operations.
2677	<	*
2678	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
2679	<	* that will never throw {@link ConcurrentModificationException},
2680	<	* and guarantees to traverse elements as they existed upon
2681	<	* construction of the iterator, and may (but is not guaranteed to)
2682	<	* reflect any modifications subsequent to construction.
2909	>	* reflected in the collection, and vice-versa.
2910		*/
2911	<	public Collection<V> values() {
2912	<	Values<K,V> vs = values;
2913	<	return (vs != null) ? vs : (values = new Values<K,V>(this));
2911	>	public ValuesView<K,V> values() {
2912	>	ValuesView<K,V> vs = values;
2913	>	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
2914		}
2915
2916		/**
#	Line 2703 | Line 2930 | public class ConcurrentHashMapV8<K, V>
2930		* reflect any modifications subsequent to construction.
2931		*/
2932		public Set<Map.Entry<K,V>> entrySet() {
2933	<	EntrySet<K,V> es = entrySet;
2934	<	return (es != null) ? es : (entrySet = new EntrySet<K,V>(this));
2933	>	EntrySetView<K,V> es = entrySet;
2934	>	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
2935		}
2936
2937		/**
#	Line 2728 | Line 2955 | public class ConcurrentHashMapV8<K, V>
2955		}
2956
2957		/**
2958	<	* Returns a partionable iterator of the keys in this map.
2958	>	* Returns a partitionable iterator of the keys in this map.
2959		*
2960	<	* @return a partionable iterator of the keys in this map
2960	>	* @return a partitionable iterator of the keys in this map
2961		*/
2962		public Spliterator<K> keySpliterator() {
2963		return new KeyIterator<K,V>(this);
2964		}
2965
2966		/**
2967	<	* Returns a partionable iterator of the values in this map.
2967	>	* Returns a partitionable iterator of the values in this map.
2968		*
2969	<	* @return a partionable iterator of the values in this map
2969	>	* @return a partitionable iterator of the values in this map
2970		*/
2971		public Spliterator<V> valueSpliterator() {
2972		return new ValueIterator<K,V>(this);
2973		}
2974
2975		/**
2976	<	* Returns a partionable iterator of the entries in this map.
2976	>	* Returns a partitionable iterator of the entries in this map.
2977		*
2978	<	* @return a partionable iterator of the entries in this map
2978	>	* @return a partitionable iterator of the entries in this map
2979		*/
2980		public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2981		return new EntryIterator<K,V>(this);
#	Line 2763 | Line 2990 | public class ConcurrentHashMapV8<K, V>
2990		*/
2991		public int hashCode() {
2992		int h = 0;
2993	<	InternalIterator<K,V> it = new InternalIterator<K,V>(this);
2994	<	Object v;
2993	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2994	>	V v;
2995		while ((v = it.advance()) != null) {
2996		h += it.nextKey.hashCode() ^ v.hashCode();
2997		}
#	Line 2783 | Line 3010 | public class ConcurrentHashMapV8<K, V>
3010		* @return a string representation of this map
3011		*/
3012		public String toString() {
3013	<	InternalIterator<K,V> it = new InternalIterator<K,V>(this);
3013	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3014		StringBuilder sb = new StringBuilder();
3015		sb.append('{');
3016	<	Object v;
3016	>	V v;
3017		if ((v = it.advance()) != null) {
3018		for (;;) {
3019		Object k = it.nextKey;
#	Line 2816 | Line 3043 | public class ConcurrentHashMapV8<K, V>
3043		if (!(o instanceof Map))
3044		return false;
3045		Map<?,?> m = (Map<?,?>) o;
3046	<	InternalIterator<K,V> it = new InternalIterator<K,V>(this);
3047	<	Object val;
3046	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3047	>	V val;
3048		while ((val = it.advance()) != null) {
3049		Object v = m.get(it.nextKey);
3050		if (v == null || (v != val && !v.equals(val)))
#	Line 2837 | Line 3064 | public class ConcurrentHashMapV8<K, V>
3064
3065		/* ----------------Iterators -------------- */
3066
3067	<	static final class KeyIterator<K,V> extends InternalIterator<K,V>
3067	>	@SuppressWarnings("serial") static final class KeyIterator<K,V>
3068	>	extends Traverser<K,V,Object>
3069		implements Spliterator<K>, Enumeration<K> {
3070		KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3071	<	KeyIterator(InternalIterator<K,V> it, boolean split) {
3072	<	super(it, split);
3071	>	KeyIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3072	>	super(map, it, -1);
3073		}
3074		public KeyIterator<K,V> split() {
3075	<	if (last != null || (next != null && nextVal == null))
3075	>	if (nextKey != null)
3076		throw new IllegalStateException();
3077	<	return new KeyIterator<K,V>(this, true);
3077	>	return new KeyIterator<K,V>(map, this);
3078		}
3079	<	public KeyIterator<K,V> clone() {
2852	<	if (last != null || (next != null && nextVal == null))
2853	<	throw new IllegalStateException();
2854	<	return new KeyIterator<K,V>(this, false);
2855	<	}
2856	<
2857	<	@SuppressWarnings("unchecked")
2858	<	public final K next() {
3079	>	@SuppressWarnings("unchecked") public final K next() {
3080		if (nextVal == null && advance() == null)
3081		throw new NoSuchElementException();
3082		Object k = nextKey;
#	Line 2866 | Line 3087 | public class ConcurrentHashMapV8<K, V>
3087		public final K nextElement() { return next(); }
3088		}
3089
3090	<	static final class ValueIterator<K,V> extends InternalIterator<K,V>
3090	>	@SuppressWarnings("serial") static final class ValueIterator<K,V>
3091	>	extends Traverser<K,V,Object>
3092		implements Spliterator<V>, Enumeration<V> {
3093		ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3094	<	ValueIterator(InternalIterator<K,V> it, boolean split) {
3095	<	super(it, split);
3094	>	ValueIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3095	>	super(map, it, -1);
3096		}
3097		public ValueIterator<K,V> split() {
3098	<	if (last != null || (next != null && nextVal == null))
2877	<	throw new IllegalStateException();
2878	<	return new ValueIterator<K,V>(this, true);
2879	<	}
2880	<
2881	<	public ValueIterator<K,V> clone() {
2882	<	if (last != null || (next != null && nextVal == null))
3098	>	if (nextKey != null)
3099		throw new IllegalStateException();
3100	<	return new ValueIterator<K,V>(this, false);
3100	>	return new ValueIterator<K,V>(map, this);
3101		}
3102
2887	–	@SuppressWarnings("unchecked")
3103		public final V next() {
3104	<	Object v;
3104	>	V v;
3105		if ((v = nextVal) == null && (v = advance()) == null)
3106		throw new NoSuchElementException();
3107		nextVal = null;
3108	<	return (V) v;
3108	>	return v;
3109		}
3110
3111		public final V nextElement() { return next(); }
3112		}
3113
3114	<	static final class EntryIterator<K,V> extends InternalIterator<K,V>
3114	>	@SuppressWarnings("serial") static final class EntryIterator<K,V>
3115	>	extends Traverser<K,V,Object>
3116		implements Spliterator<Map.Entry<K,V>> {
3117		EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3118	<	EntryIterator(InternalIterator<K,V> it, boolean split) {
3119	<	super(it, split);
3118	>	EntryIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3119	>	super(map, it, -1);
3120		}
3121		public EntryIterator<K,V> split() {
3122	<	if (last != null || (next != null && nextVal == null))
3122	>	if (nextKey != null)
3123		throw new IllegalStateException();
3124	<	return new EntryIterator<K,V>(this, true);
2909	<	}
2910	<	public EntryIterator<K,V> clone() {
2911	<	if (last != null || (next != null && nextVal == null))
2912	<	throw new IllegalStateException();
2913	<	return new EntryIterator<K,V>(this, false);
3124	>	return new EntryIterator<K,V>(map, this);
3125		}
3126
3127	<	@SuppressWarnings("unchecked")
3128	<	public final Map.Entry<K,V> next() {
2918	<	Object v;
3127	>	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3128	>	V v;
3129		if ((v = nextVal) == null && (v = advance()) == null)
3130		throw new NoSuchElementException();
3131		Object k = nextKey;
3132		nextVal = null;
3133	<	return new MapEntry<K,V>((K)k, (V)v, map);
3133	>	return new MapEntry<K,V>((K)k, v, map);
3134		}
3135		}
3136
#	Line 2952 | Line 3162 | public class ConcurrentHashMapV8<K, V>
3162
3163		/**
3164		* Sets our entry's value and writes through to the map. The
3165	<	* value to return is somewhat arbitrary here. Since a we do
3166	<	* not necessarily track asynchronous changes, the most recent
3165	>	* value to return is somewhat arbitrary here. Since we do not
3166	>	* necessarily track asynchronous changes, the most recent
3167		* "previous" value could be different from what we return (or
3168		* could even have been removed in which case the put will
3169		* re-establish). We do not and cannot guarantee more.
#	Line 2967 | Line 3177 | public class ConcurrentHashMapV8<K, V>
3177		}
3178		}
3179
3180	+	/**
3181	+	* Returns exportable snapshot entry for the given key and value
3182	+	* when write-through can't or shouldn't be used.
3183	+	*/
3184	+	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
3185	+	return new AbstractMap.SimpleEntry<K,V>(k, v);
3186	+	}
3187	+
3188	+	/* ---------------- Serialization Support -------------- */
3189	+
3190	+	/**
3191	+	* Stripped-down version of helper class used in previous version,
3192	+	* declared for the sake of serialization compatibility
3193	+	*/
3194	+	static class Segment<K,V> implements Serializable {
3195	+	private static final long serialVersionUID = 2249069246763182397L;
3196	+	final float loadFactor;
3197	+	Segment(float lf) { this.loadFactor = lf; }
3198	+	}
3199	+
3200	+	/**
3201	+	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
3202	+	* stream (i.e., serializes it).
3203	+	* @param s the stream
3204	+	* @serialData
3205	+	* the key (Object) and value (Object)
3206	+	* for each key-value mapping, followed by a null pair.
3207	+	* The key-value mappings are emitted in no particular order.
3208	+	*/
3209	+	@SuppressWarnings("unchecked") private void writeObject
3210	+	(java.io.ObjectOutputStream s)
3211	+	throws java.io.IOException {
3212	+	if (segments == null) { // for serialization compatibility
3213	+	segments = (Segment<K,V>[])
3214	+	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
3215	+	for (int i = 0; i < segments.length; ++i)
3216	+	segments[i] = new Segment<K,V>(LOAD_FACTOR);
3217	+	}
3218	+	s.defaultWriteObject();
3219	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3220	+	V v;
3221	+	while ((v = it.advance()) != null) {
3222	+	s.writeObject(it.nextKey);
3223	+	s.writeObject(v);
3224	+	}
3225	+	s.writeObject(null);
3226	+	s.writeObject(null);
3227	+	segments = null; // throw away
3228	+	}
3229	+
3230	+	/**
3231	+	* Reconstitutes the instance from a stream (that is, deserializes it).
3232	+	* @param s the stream
3233	+	*/
3234	+	@SuppressWarnings("unchecked") private void readObject
3235	+	(java.io.ObjectInputStream s)
3236	+	throws java.io.IOException, ClassNotFoundException {
3237	+	s.defaultReadObject();
3238	+	this.segments = null; // unneeded
3239	+
3240	+	// Create all nodes, then place in table once size is known
3241	+	long size = 0L;
3242	+	Node<V> p = null;
3243	+	for (;;) {
3244	+	K k = (K) s.readObject();
3245	+	V v = (V) s.readObject();
3246	+	if (k != null && v != null) {
3247	+	int h = spread(k.hashCode());
3248	+	p = new Node<V>(h, k, v, p);
3249	+	++size;
3250	+	}
3251	+	else
3252	+	break;
3253	+	}
3254	+	if (p != null) {
3255	+	boolean init = false;
3256	+	int n;
3257	+	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3258	+	n = MAXIMUM_CAPACITY;
3259	+	else {
3260	+	int sz = (int)size;
3261	+	n = tableSizeFor(sz + (sz >>> 1) + 1);
3262	+	}
3263	+	int sc = sizeCtl;
3264	+	boolean collide = false;
3265	+	if (n > sc &&
3266	+	U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
3267	+	try {
3268	+	if (table == null) {
3269	+	init = true;
3270	+	@SuppressWarnings("rawtypes") Node[] rt = new Node[n];
3271	+	Node<V>[] tab = (Node<V>[])rt;
3272	+	int mask = n - 1;
3273	+	while (p != null) {
3274	+	int j = p.hash & mask;
3275	+	Node<V> next = p.next;
3276	+	Node<V> q = p.next = tabAt(tab, j);
3277	+	setTabAt(tab, j, p);
3278	+	if (!collide && q != null && q.hash == p.hash)
3279	+	collide = true;
3280	+	p = next;
3281	+	}
3282	+	table = tab;
3283	+	addCount(size, -1);
3284	+	sc = n - (n >>> 2);
3285	+	}
3286	+	} finally {
3287	+	sizeCtl = sc;
3288	+	}
3289	+	if (collide) { // rescan and convert to TreeBins
3290	+	Node<V>[] tab = table;
3291	+	for (int i = 0; i < tab.length; ++i) {
3292	+	int c = 0;
3293	+	for (Node<V> e = tabAt(tab, i); e != null; e = e.next) {
3294	+	if (++c > TREE_THRESHOLD &&
3295	+	(e.key instanceof Comparable)) {
3296	+	replaceWithTreeBin(tab, i, e.key);
3297	+	break;
3298	+	}
3299	+	}
3300	+	}
3301	+	}
3302	+	}
3303	+	if (!init) { // Can only happen if unsafely published.
3304	+	while (p != null) {
3305	+	internalPut((K)p.key, p.val, false);
3306	+	p = p.next;
3307	+	}
3308	+	}
3309	+	}
3310	+	}
3311	+
3312	+	// -------------------------------------------------------
3313	+
3314	+	// Sams
3315	+	/** Interface describing a void action of one argument */
3316	+	public interface Action<A> { void apply(A a); }
3317	+	/** Interface describing a void action of two arguments */
3318	+	public interface BiAction<A,B> { void apply(A a, B b); }
3319	+	/** Interface describing a function of one argument */
3320	+	public interface Fun<A,T> { T apply(A a); }
3321	+	/** Interface describing a function of two arguments */
3322	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
3323	+	/** Interface describing a function of no arguments */
3324	+	public interface Generator<T> { T apply(); }
3325	+	/** Interface describing a function mapping its argument to a double */
3326	+	public interface ObjectToDouble<A> { double apply(A a); }
3327	+	/** Interface describing a function mapping its argument to a long */
3328	+	public interface ObjectToLong<A> { long apply(A a); }
3329	+	/** Interface describing a function mapping its argument to an int */
3330	+	public interface ObjectToInt<A> {int apply(A a); }
3331	+	/** Interface describing a function mapping two arguments to a double */
3332	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
3333	+	/** Interface describing a function mapping two arguments to a long */
3334	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
3335	+	/** Interface describing a function mapping two arguments to an int */
3336	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
3337	+	/** Interface describing a function mapping a double to a double */
3338	+	public interface DoubleToDouble { double apply(double a); }
3339	+	/** Interface describing a function mapping a long to a long */
3340	+	public interface LongToLong { long apply(long a); }
3341	+	/** Interface describing a function mapping an int to an int */
3342	+	public interface IntToInt { int apply(int a); }
3343	+	/** Interface describing a function mapping two doubles to a double */
3344	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3345	+	/** Interface describing a function mapping two longs to a long */
3346	+	public interface LongByLongToLong { long apply(long a, long b); }
3347	+	/** Interface describing a function mapping two ints to an int */
3348	+	public interface IntByIntToInt { int apply(int a, int b); }
3349	+
3350	+
3351	+	// -------------------------------------------------------
3352	+
3353	+	// Sequential bulk operations
3354	+
3355	+	/**
3356	+	* Performs the given action for each (key, value).
3357	+	*
3358	+	* @param action the action
3359	+	*/
3360	+	@SuppressWarnings("unchecked") public void forEachSequentially
3361	+	(BiAction<K,V> action) {
3362	+	if (action == null) throw new NullPointerException();
3363	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3364	+	V v;
3365	+	while ((v = it.advance()) != null)
3366	+	action.apply((K)it.nextKey, v);
3367	+	}
3368	+
3369	+	/**
3370	+	* Performs the given action for each non-null transformation
3371	+	* of each (key, value).
3372	+	*
3373	+	* @param transformer a function returning the transformation
3374	+	* for an element, or null of there is no transformation (in
3375	+	* which case the action is not applied).
3376	+	* @param action the action
3377	+	*/
3378	+	@SuppressWarnings("unchecked") public <U> void forEachSequentially
3379	+	(BiFun<? super K, ? super V, ? extends U> transformer,
3380	+	Action<U> action) {
3381	+	if (transformer == null || action == null)
3382	+	throw new NullPointerException();
3383	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3384	+	V v; U u;
3385	+	while ((v = it.advance()) != null) {
3386	+	if ((u = transformer.apply((K)it.nextKey, v)) != null)
3387	+	action.apply(u);
3388	+	}
3389	+	}
3390	+
3391	+	/**
3392	+	* Returns a non-null result from applying the given search
3393	+	* function on each (key, value), or null if none.
3394	+	*
3395	+	* @param searchFunction a function returning a non-null
3396	+	* result on success, else null
3397	+	* @return a non-null result from applying the given search
3398	+	* function on each (key, value), or null if none
3399	+	*/
3400	+	@SuppressWarnings("unchecked") public <U> U searchSequentially
3401	+	(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3402	+	if (searchFunction == null) throw new NullPointerException();
3403	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3404	+	V v; U u;
3405	+	while ((v = it.advance()) != null) {
3406	+	if ((u = searchFunction.apply((K)it.nextKey, v)) != null)
3407	+	return u;
3408	+	}
3409	+	return null;
3410	+	}
3411	+
3412	+	/**
3413	+	* Returns the result of accumulating the given transformation
3414	+	* of all (key, value) pairs using the given reducer to
3415	+	* combine values, or null if none.
3416	+	*
3417	+	* @param transformer a function returning the transformation
3418	+	* for an element, or null of there is no transformation (in
3419	+	* which case it is not combined).
3420	+	* @param reducer a commutative associative combining function
3421	+	* @return the result of accumulating the given transformation
3422	+	* of all (key, value) pairs
3423	+	*/
3424	+	@SuppressWarnings("unchecked") public <U> U reduceSequentially
3425	+	(BiFun<? super K, ? super V, ? extends U> transformer,
3426	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3427	+	if (transformer == null || reducer == null)
3428	+	throw new NullPointerException();
3429	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3430	+	U r = null, u; V v;
3431	+	while ((v = it.advance()) != null) {
3432	+	if ((u = transformer.apply((K)it.nextKey, v)) != null)
3433	+	r = (r == null) ? u : reducer.apply(r, u);
3434	+	}
3435	+	return r;
3436	+	}
3437	+
3438	+	/**
3439	+	* Returns the result of accumulating the given transformation
3440	+	* of all (key, value) pairs using the given reducer to
3441	+	* combine values, and the given basis as an identity value.
3442	+	*
3443	+	* @param transformer a function returning the transformation
3444	+	* for an element
3445	+	* @param basis the identity (initial default value) for the reduction
3446	+	* @param reducer a commutative associative combining function
3447	+	* @return the result of accumulating the given transformation
3448	+	* of all (key, value) pairs
3449	+	*/
3450	+	@SuppressWarnings("unchecked") public double reduceToDoubleSequentially
3451	+	(ObjectByObjectToDouble<? super K, ? super V> transformer,
3452	+	double basis,
3453	+	DoubleByDoubleToDouble reducer) {
3454	+	if (transformer == null || reducer == null)
3455	+	throw new NullPointerException();
3456	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3457	+	double r = basis; V v;
3458	+	while ((v = it.advance()) != null)
3459	+	r = reducer.apply(r, transformer.apply((K)it.nextKey, v));
3460	+	return r;
3461	+	}
3462	+
3463	+	/**
3464	+	* Returns the result of accumulating the given transformation
3465	+	* of all (key, value) pairs using the given reducer to
3466	+	* combine values, and the given basis as an identity value.
3467	+	*
3468	+	* @param transformer a function returning the transformation
3469	+	* for an element
3470	+	* @param basis the identity (initial default value) for the reduction
3471	+	* @param reducer a commutative associative combining function
3472	+	* @return the result of accumulating the given transformation
3473	+	* of all (key, value) pairs
3474	+	*/
3475	+	@SuppressWarnings("unchecked") public long reduceToLongSequentially
3476	+	(ObjectByObjectToLong<? super K, ? super V> transformer,
3477	+	long basis,
3478	+	LongByLongToLong reducer) {
3479	+	if (transformer == null || reducer == null)
3480	+	throw new NullPointerException();
3481	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3482	+	long r = basis; V v;
3483	+	while ((v = it.advance()) != null)
3484	+	r = reducer.apply(r, transformer.apply((K)it.nextKey, v));
3485	+	return r;
3486	+	}
3487	+
3488	+	/**
3489	+	* Returns the result of accumulating the given transformation
3490	+	* of all (key, value) pairs using the given reducer to
3491	+	* combine values, and the given basis as an identity value.
3492	+	*
3493	+	* @param transformer a function returning the transformation
3494	+	* for an element
3495	+	* @param basis the identity (initial default value) for the reduction
3496	+	* @param reducer a commutative associative combining function
3497	+	* @return the result of accumulating the given transformation
3498	+	* of all (key, value) pairs
3499	+	*/
3500	+	@SuppressWarnings("unchecked") public int reduceToIntSequentially
3501	+	(ObjectByObjectToInt<? super K, ? super V> transformer,
3502	+	int basis,
3503	+	IntByIntToInt reducer) {
3504	+	if (transformer == null || reducer == null)
3505	+	throw new NullPointerException();
3506	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3507	+	int r = basis; V v;
3508	+	while ((v = it.advance()) != null)
3509	+	r = reducer.apply(r, transformer.apply((K)it.nextKey, v));
3510	+	return r;
3511	+	}
3512	+
3513	+	/**
3514	+	* Performs the given action for each key.
3515	+	*
3516	+	* @param action the action
3517	+	*/
3518	+	@SuppressWarnings("unchecked") public void forEachKeySequentially
3519	+	(Action<K> action) {
3520	+	if (action == null) throw new NullPointerException();
3521	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3522	+	while (it.advance() != null)
3523	+	action.apply((K)it.nextKey);
3524	+	}
3525	+
3526	+	/**
3527	+	* Performs the given action for each non-null transformation
3528	+	* of each key.
3529	+	*
3530	+	* @param transformer a function returning the transformation
3531	+	* for an element, or null of there is no transformation (in
3532	+	* which case the action is not applied).
3533	+	* @param action the action
3534	+	*/
3535	+	@SuppressWarnings("unchecked") public <U> void forEachKeySequentially
3536	+	(Fun<? super K, ? extends U> transformer,
3537	+	Action<U> action) {
3538	+	if (transformer == null || action == null)
3539	+	throw new NullPointerException();
3540	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3541	+	U u;
3542	+	while (it.advance() != null) {
3543	+	if ((u = transformer.apply((K)it.nextKey)) != null)
3544	+	action.apply(u);
3545	+	}
3546	+	ForkJoinTasks.forEachKey
3547	+	(this, transformer, action).invoke();
3548	+	}
3549	+
3550	+	/**
3551	+	* Returns a non-null result from applying the given search
3552	+	* function on each key, or null if none.
3553	+	*
3554	+	* @param searchFunction a function returning a non-null
3555	+	* result on success, else null
3556	+	* @return a non-null result from applying the given search
3557	+	* function on each key, or null if none
3558	+	*/
3559	+	@SuppressWarnings("unchecked") public <U> U searchKeysSequentially
3560	+	(Fun<? super K, ? extends U> searchFunction) {
3561	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3562	+	U u;
3563	+	while (it.advance() != null) {
3564	+	if ((u = searchFunction.apply((K)it.nextKey)) != null)
3565	+	return u;
3566	+	}
3567	+	return null;
3568	+	}
3569	+
3570	+	/**
3571	+	* Returns the result of accumulating all keys using the given
3572	+	* reducer to combine values, or null if none.
3573	+	*
3574	+	* @param reducer a commutative associative combining function
3575	+	* @return the result of accumulating all keys using the given
3576	+	* reducer to combine values, or null if none
3577	+	*/
3578	+	@SuppressWarnings("unchecked") public K reduceKeysSequentially
3579	+	(BiFun<? super K, ? super K, ? extends K> reducer) {
3580	+	if (reducer == null) throw new NullPointerException();
3581	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3582	+	K r = null;
3583	+	while (it.advance() != null) {
3584	+	K u = (K)it.nextKey;
3585	+	r = (r == null) ? u : reducer.apply(r, u);
3586	+	}
3587	+	return r;
3588	+	}
3589	+
3590	+	/**
3591	+	* Returns the result of accumulating the given transformation
3592	+	* of all keys using the given reducer to combine values, or
3593	+	* null if none.
3594	+	*
3595	+	* @param transformer a function returning the transformation
3596	+	* for an element, or null of there is no transformation (in
3597	+	* which case it is not combined).
3598	+	* @param reducer a commutative associative combining function
3599	+	* @return the result of accumulating the given transformation
3600	+	* of all keys
3601	+	*/
3602	+	@SuppressWarnings("unchecked") public <U> U reduceKeysSequentially
3603	+	(Fun<? super K, ? extends U> transformer,
3604	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3605	+	if (transformer == null || reducer == null)
3606	+	throw new NullPointerException();
3607	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3608	+	U r = null, u;
3609	+	while (it.advance() != null) {
3610	+	if ((u = transformer.apply((K)it.nextKey)) != null)
3611	+	r = (r == null) ? u : reducer.apply(r, u);
3612	+	}
3613	+	return r;
3614	+	}
3615	+
3616	+	/**
3617	+	* Returns the result of accumulating the given transformation
3618	+	* of all keys using the given reducer to combine values, and
3619	+	* the given basis as an identity value.
3620	+	*
3621	+	* @param transformer a function returning the transformation
3622	+	* for an element
3623	+	* @param basis the identity (initial default value) for the reduction
3624	+	* @param reducer a commutative associative combining function
3625	+	* @return  the result of accumulating the given transformation
3626	+	* of all keys
3627	+	*/
3628	+	@SuppressWarnings("unchecked") public double reduceKeysToDoubleSequentially
3629	+	(ObjectToDouble<? super K> transformer,
3630	+	double basis,
3631	+	DoubleByDoubleToDouble reducer) {
3632	+	if (transformer == null || reducer == null)
3633	+	throw new NullPointerException();
3634	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3635	+	double r = basis;
3636	+	while (it.advance() != null)
3637	+	r = reducer.apply(r, transformer.apply((K)it.nextKey));
3638	+	return r;
3639	+	}
3640	+
3641	+	/**
3642	+	* Returns the result of accumulating the given transformation
3643	+	* of all keys using the given reducer to combine values, and
3644	+	* the given basis as an identity value.
3645	+	*
3646	+	* @param transformer a function returning the transformation
3647	+	* for an element
3648	+	* @param basis the identity (initial default value) for the reduction
3649	+	* @param reducer a commutative associative combining function
3650	+	* @return the result of accumulating the given transformation
3651	+	* of all keys
3652	+	*/
3653	+	@SuppressWarnings("unchecked") public long reduceKeysToLongSequentially
3654	+	(ObjectToLong<? super K> transformer,
3655	+	long basis,
3656	+	LongByLongToLong reducer) {
3657	+	if (transformer == null || reducer == null)
3658	+	throw new NullPointerException();
3659	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3660	+	long r = basis;
3661	+	while (it.advance() != null)
3662	+	r = reducer.apply(r, transformer.apply((K)it.nextKey));
3663	+	return r;
3664	+	}
3665	+
3666	+	/**
3667	+	* Returns the result of accumulating the given transformation
3668	+	* of all keys using the given reducer to combine values, and
3669	+	* the given basis as an identity value.
3670	+	*
3671	+	* @param transformer a function returning the transformation
3672	+	* for an element
3673	+	* @param basis the identity (initial default value) for the reduction
3674	+	* @param reducer a commutative associative combining function
3675	+	* @return the result of accumulating the given transformation
3676	+	* of all keys
3677	+	*/
3678	+	@SuppressWarnings("unchecked") public int reduceKeysToIntSequentially
3679	+	(ObjectToInt<? super K> transformer,
3680	+	int basis,
3681	+	IntByIntToInt reducer) {
3682	+	if (transformer == null || reducer == null)
3683	+	throw new NullPointerException();
3684	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3685	+	int r = basis;
3686	+	while (it.advance() != null)
3687	+	r = reducer.apply(r, transformer.apply((K)it.nextKey));
3688	+	return r;
3689	+	}
3690	+
3691	+	/**
3692	+	* Performs the given action for each value.
3693	+	*
3694	+	* @param action the action
3695	+	*/
3696	+	public void forEachValueSequentially(Action<V> action) {
3697	+	if (action == null) throw new NullPointerException();
3698	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3699	+	V v;
3700	+	while ((v = it.advance()) != null)
3701	+	action.apply(v);
3702	+	}
3703	+
3704	+	/**
3705	+	* Performs the given action for each non-null transformation
3706	+	* of each value.
3707	+	*
3708	+	* @param transformer a function returning the transformation
3709	+	* for an element, or null of there is no transformation (in
3710	+	* which case the action is not applied).
3711	+	*/
3712	+	public <U> void forEachValueSequentially
3713	+	(Fun<? super V, ? extends U> transformer,
3714	+	Action<U> action) {
3715	+	if (transformer == null || action == null)
3716	+	throw new NullPointerException();
3717	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3718	+	V v; U u;
3719	+	while ((v = it.advance()) != null) {
3720	+	if ((u = transformer.apply(v)) != null)
3721	+	action.apply(u);
3722	+	}
3723	+	}
3724	+
3725	+	/**
3726	+	* Returns a non-null result from applying the given search
3727	+	* function on each value, or null if none.
3728	+	*
3729	+	* @param searchFunction a function returning a non-null
3730	+	* result on success, else null
3731	+	* @return a non-null result from applying the given search
3732	+	* function on each value, or null if none
3733	+	*/
3734	+	public <U> U searchValuesSequentially
3735	+	(Fun<? super V, ? extends U> searchFunction) {
3736	+	if (searchFunction == null) throw new NullPointerException();
3737	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3738	+	V v; U u;
3739	+	while ((v = it.advance()) != null) {
3740	+	if ((u = searchFunction.apply(v)) != null)
3741	+	return u;
3742	+	}
3743	+	return null;
3744	+	}
3745	+
3746	+	/**
3747	+	* Returns the result of accumulating all values using the
3748	+	* given reducer to combine values, or null if none.
3749	+	*
3750	+	* @param reducer a commutative associative combining function
3751	+	* @return  the result of accumulating all values
3752	+	*/
3753	+	public V reduceValuesSequentially
3754	+	(BiFun<? super V, ? super V, ? extends V> reducer) {
3755	+	if (reducer == null) throw new NullPointerException();
3756	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3757	+	V r = null; V v;
3758	+	while ((v = it.advance()) != null)
3759	+	r = (r == null) ? v : reducer.apply(r, v);
3760	+	return r;
3761	+	}
3762	+
3763	+	/**
3764	+	* Returns the result of accumulating the given transformation
3765	+	* of all values using the given reducer to combine values, or
3766	+	* null if none.
3767	+	*
3768	+	* @param transformer a function returning the transformation
3769	+	* for an element, or null of there is no transformation (in
3770	+	* which case it is not combined).
3771	+	* @param reducer a commutative associative combining function
3772	+	* @return the result of accumulating the given transformation
3773	+	* of all values
3774	+	*/
3775	+	public <U> U reduceValuesSequentially
3776	+	(Fun<? super V, ? extends U> transformer,
3777	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3778	+	if (transformer == null || reducer == null)
3779	+	throw new NullPointerException();
3780	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3781	+	U r = null, u; V v;
3782	+	while ((v = it.advance()) != null) {
3783	+	if ((u = transformer.apply(v)) != null)
3784	+	r = (r == null) ? u : reducer.apply(r, u);
3785	+	}
3786	+	return r;
3787	+	}
3788	+
3789	+	/**
3790	+	* Returns the result of accumulating the given transformation
3791	+	* of all values using the given reducer to combine values,
3792	+	* and the given basis as an identity value.
3793	+	*
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 values
3800	+	*/
3801	+	public double reduceValuesToDoubleSequentially
3802	+	(ObjectToDouble<? super V> transformer,
3803	+	double basis,
3804	+	DoubleByDoubleToDouble reducer) {
3805	+	if (transformer == null || reducer == null)
3806	+	throw new NullPointerException();
3807	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3808	+	double r = basis; V v;
3809	+	while ((v = it.advance()) != null)
3810	+	r = reducer.apply(r, transformer.apply(v));
3811	+	return r;
3812	+	}
3813	+
3814	+	/**
3815	+	* Returns the result of accumulating the given transformation
3816	+	* of all values using the given reducer to combine values,
3817	+	* and the given basis as an identity value.
3818	+	*
3819	+	* @param transformer a function returning the transformation
3820	+	* for an element
3821	+	* @param basis the identity (initial default value) for the reduction
3822	+	* @param reducer a commutative associative combining function
3823	+	* @return the result of accumulating the given transformation
3824	+	* of all values
3825	+	*/
3826	+	public long reduceValuesToLongSequentially
3827	+	(ObjectToLong<? super V> transformer,
3828	+	long basis,
3829	+	LongByLongToLong reducer) {
3830	+	if (transformer == null || reducer == null)
3831	+	throw new NullPointerException();
3832	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3833	+	long r = basis; V v;
3834	+	while ((v = it.advance()) != null)
3835	+	r = reducer.apply(r, transformer.apply(v));
3836	+	return r;
3837	+	}
3838	+
3839	+	/**
3840	+	* Returns the result of accumulating the given transformation
3841	+	* of all values using the given reducer to combine values,
3842	+	* and the given basis as an identity value.
3843	+	*
3844	+	* @param transformer a function returning the transformation
3845	+	* for an element
3846	+	* @param basis the identity (initial default value) for the reduction
3847	+	* @param reducer a commutative associative combining function
3848	+	* @return the result of accumulating the given transformation
3849	+	* of all values
3850	+	*/
3851	+	public int reduceValuesToIntSequentially
3852	+	(ObjectToInt<? super V> transformer,
3853	+	int basis,
3854	+	IntByIntToInt reducer) {
3855	+	if (transformer == null || reducer == null)
3856	+	throw new NullPointerException();
3857	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3858	+	int r = basis; V v;
3859	+	while ((v = it.advance()) != null)
3860	+	r = reducer.apply(r, transformer.apply(v));
3861	+	return r;
3862	+	}
3863	+
3864	+	/**
3865	+	* Performs the given action for each entry.
3866	+	*
3867	+	* @param action the action
3868	+	*/
3869	+	@SuppressWarnings("unchecked") public void forEachEntrySequentially
3870	+	(Action<Map.Entry<K,V>> action) {
3871	+	if (action == null) throw new NullPointerException();
3872	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3873	+	V v;
3874	+	while ((v = it.advance()) != null)
3875	+	action.apply(entryFor((K)it.nextKey, v));
3876	+	}
3877	+
3878	+	/**
3879	+	* Performs the given action for each non-null transformation
3880	+	* of each entry.
3881	+	*
3882	+	* @param transformer a function returning the transformation
3883	+	* for an element, or null of there is no transformation (in
3884	+	* which case the action is not applied).
3885	+	* @param action the action
3886	+	*/
3887	+	@SuppressWarnings("unchecked") public <U> void forEachEntrySequentially
3888	+	(Fun<Map.Entry<K,V>, ? extends U> transformer,
3889	+	Action<U> action) {
3890	+	if (transformer == null || action == null)
3891	+	throw new NullPointerException();
3892	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3893	+	V v; U u;
3894	+	while ((v = it.advance()) != null) {
3895	+	if ((u = transformer.apply(entryFor((K)it.nextKey, v))) != null)
3896	+	action.apply(u);
3897	+	}
3898	+	}
3899	+
3900	+	/**
3901	+	* Returns a non-null result from applying the given search
3902	+	* function on each entry, or null if none.
3903	+	*
3904	+	* @param searchFunction a function returning a non-null
3905	+	* result on success, else null
3906	+	* @return a non-null result from applying the given search
3907	+	* function on each entry, or null if none
3908	+	*/
3909	+	@SuppressWarnings("unchecked") public <U> U searchEntriesSequentially
3910	+	(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
3911	+	if (searchFunction == null) throw new NullPointerException();
3912	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3913	+	V v; U u;
3914	+	while ((v = it.advance()) != null) {
3915	+	if ((u = searchFunction.apply(entryFor((K)it.nextKey, v))) != null)
3916	+	return u;
3917	+	}
3918	+	return null;
3919	+	}
3920	+
3921	+	/**
3922	+	* Returns the result of accumulating all entries using the
3923	+	* given reducer to combine values, or null if none.
3924	+	*
3925	+	* @param reducer a commutative associative combining function
3926	+	* @return the result of accumulating all entries
3927	+	*/
3928	+	@SuppressWarnings("unchecked") public Map.Entry<K,V> reduceEntriesSequentially
3929	+	(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
3930	+	if (reducer == null) throw new NullPointerException();
3931	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3932	+	Map.Entry<K,V> r = null; V v;
3933	+	while ((v = it.advance()) != null) {
3934	+	Map.Entry<K,V> u = entryFor((K)it.nextKey, v);
3935	+	r = (r == null) ? u : reducer.apply(r, u);
3936	+	}
3937	+	return r;
3938	+	}
3939	+
3940	+	/**
3941	+	* Returns the result of accumulating the given transformation
3942	+	* of all entries using the given reducer to combine values,
3943	+	* or null if none.
3944	+	*
3945	+	* @param transformer a function returning the transformation
3946	+	* for an element, or null of there is no transformation (in
3947	+	* which case it is not combined).
3948	+	* @param reducer a commutative associative combining function
3949	+	* @return the result of accumulating the given transformation
3950	+	* of all entries
3951	+	*/
3952	+	@SuppressWarnings("unchecked") public <U> U reduceEntriesSequentially
3953	+	(Fun<Map.Entry<K,V>, ? extends U> transformer,
3954	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3955	+	if (transformer == null || reducer == null)
3956	+	throw new NullPointerException();
3957	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3958	+	U r = null, u; V v;
3959	+	while ((v = it.advance()) != null) {
3960	+	if ((u = transformer.apply(entryFor((K)it.nextKey, v))) != null)
3961	+	r = (r == null) ? u : reducer.apply(r, u);
3962	+	}
3963	+	return r;
3964	+	}
3965	+
3966	+	/**
3967	+	* Returns the result of accumulating the given transformation
3968	+	* of all entries using the given reducer to combine values,
3969	+	* and the given basis as an identity value.
3970	+	*
3971	+	* @param transformer a function returning the transformation
3972	+	* for an element
3973	+	* @param basis the identity (initial default value) for the reduction
3974	+	* @param reducer a commutative associative combining function
3975	+	* @return the result of accumulating the given transformation
3976	+	* of all entries
3977	+	*/
3978	+	@SuppressWarnings("unchecked") public double reduceEntriesToDoubleSequentially
3979	+	(ObjectToDouble<Map.Entry<K,V>> transformer,
3980	+	double basis,
3981	+	DoubleByDoubleToDouble reducer) {
3982	+	if (transformer == null || reducer == null)
3983	+	throw new NullPointerException();
3984	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3985	+	double r = basis; V v;
3986	+	while ((v = it.advance()) != null)
3987	+	r = reducer.apply(r, transformer.apply(entryFor((K)it.nextKey, v)));
3988	+	return r;
3989	+	}
3990	+
3991	+	/**
3992	+	* Returns the result of accumulating the given transformation
3993	+	* of all entries using the given reducer to combine values,
3994	+	* and the given basis as an identity value.
3995	+	*
3996	+	* @param transformer a function returning the transformation
3997	+	* for an element
3998	+	* @param basis the identity (initial default value) for the reduction
3999	+	* @param reducer a commutative associative combining function
4000	+	* @return  the result of accumulating the given transformation
4001	+	* of all entries
4002	+	*/
4003	+	@SuppressWarnings("unchecked") public long reduceEntriesToLongSequentially
4004	+	(ObjectToLong<Map.Entry<K,V>> transformer,
4005	+	long basis,
4006	+	LongByLongToLong reducer) {
4007	+	if (transformer == null || reducer == null)
4008	+	throw new NullPointerException();
4009	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4010	+	long r = basis; V v;
4011	+	while ((v = it.advance()) != null)
4012	+	r = reducer.apply(r, transformer.apply(entryFor((K)it.nextKey, v)));
4013	+	return r;
4014	+	}
4015	+
4016	+	/**
4017	+	* Returns the result of accumulating the given transformation
4018	+	* of all entries using the given reducer to combine values,
4019	+	* and the given basis as an identity value.
4020	+	*
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 entries
4027	+	*/
4028	+	@SuppressWarnings("unchecked") public int reduceEntriesToIntSequentially
4029	+	(ObjectToInt<Map.Entry<K,V>> transformer,
4030	+	int basis,
4031	+	IntByIntToInt reducer) {
4032	+	if (transformer == null || reducer == null)
4033	+	throw new NullPointerException();
4034	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4035	+	int r = basis; V v;
4036	+	while ((v = it.advance()) != null)
4037	+	r = reducer.apply(r, transformer.apply(entryFor((K)it.nextKey, v)));
4038	+	return r;
4039	+	}
4040	+
4041	+	// Parallel bulk operations
4042	+
4043	+	/**
4044	+	* Performs the given action for each (key, value).
4045	+	*
4046	+	* @param action the action
4047	+	*/
4048	+	public void forEachInParallel(BiAction<K,V> action) {
4049	+	ForkJoinTasks.forEach
4050	+	(this, action).invoke();
4051	+	}
4052	+
4053	+	/**
4054	+	* Performs the given action for each non-null transformation
4055	+	* of each (key, value).
4056	+	*
4057	+	* @param transformer a function returning the transformation
4058	+	* for an element, or null of there is no transformation (in
4059	+	* which case the action is not applied).
4060	+	* @param action the action
4061	+	*/
4062	+	public <U> void forEachInParallel
4063	+	(BiFun<? super K, ? super V, ? extends U> transformer,
4064	+	Action<U> action) {
4065	+	ForkJoinTasks.forEach
4066	+	(this, transformer, action).invoke();
4067	+	}
4068	+
4069	+	/**
4070	+	* Returns a non-null result from applying the given search
4071	+	* function on each (key, value), or null if none.  Upon
4072	+	* success, further element processing is suppressed and the
4073	+	* results of any other parallel invocations of the search
4074	+	* function are ignored.
4075	+	*
4076	+	* @param searchFunction a function returning a non-null
4077	+	* result on success, else null
4078	+	* @return a non-null result from applying the given search
4079	+	* function on each (key, value), or null if none
4080	+	*/
4081	+	public <U> U searchInParallel
4082	+	(BiFun<? super K, ? super V, ? extends U> searchFunction) {
4083	+	return ForkJoinTasks.search
4084	+	(this, searchFunction).invoke();
4085	+	}
4086	+
4087	+	/**
4088	+	* Returns the result of accumulating the given transformation
4089	+	* of all (key, value) pairs using the given reducer to
4090	+	* combine values, or null if none.
4091	+	*
4092	+	* @param transformer a function returning the transformation
4093	+	* for an element, or null of there is no transformation (in
4094	+	* which case it is not combined).
4095	+	* @param reducer a commutative associative combining function
4096	+	* @return the result of accumulating the given transformation
4097	+	* of all (key, value) pairs
4098	+	*/
4099	+	public <U> U reduceInParallel
4100	+	(BiFun<? super K, ? super V, ? extends U> transformer,
4101	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4102	+	return ForkJoinTasks.reduce
4103	+	(this, transformer, reducer).invoke();
4104	+	}
4105	+
4106	+	/**
4107	+	* Returns the result of accumulating the given transformation
4108	+	* of all (key, value) pairs using the given reducer to
4109	+	* combine values, and the given basis as an identity value.
4110	+	*
4111	+	* @param transformer a function returning the transformation
4112	+	* for an element
4113	+	* @param basis the identity (initial default value) for the reduction
4114	+	* @param reducer a commutative associative combining function
4115	+	* @return the result of accumulating the given transformation
4116	+	* of all (key, value) pairs
4117	+	*/
4118	+	public double reduceToDoubleInParallel
4119	+	(ObjectByObjectToDouble<? super K, ? super V> transformer,
4120	+	double basis,
4121	+	DoubleByDoubleToDouble reducer) {
4122	+	return ForkJoinTasks.reduceToDouble
4123	+	(this, transformer, basis, reducer).invoke();
4124	+	}
4125	+
4126	+	/**
4127	+	* Returns the result of accumulating the given transformation
4128	+	* of all (key, value) pairs using the given reducer to
4129	+	* combine values, and the given basis as an identity value.
4130	+	*
4131	+	* @param transformer a function returning the transformation
4132	+	* 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 (key, value) pairs
4137	+	*/
4138	+	public long reduceToLongInParallel
4139	+	(ObjectByObjectToLong<? super K, ? super V> transformer,
4140	+	long basis,
4141	+	LongByLongToLong reducer) {
4142	+	return ForkJoinTasks.reduceToLong
4143	+	(this, transformer, basis, reducer).invoke();
4144	+	}
4145	+
4146	+	/**
4147	+	* Returns the result of accumulating the given transformation
4148	+	* of all (key, value) pairs using the given reducer to
4149	+	* combine values, and the given basis as an identity value.
4150	+	*
4151	+	* @param transformer a function returning the transformation
4152	+	* for an element
4153	+	* @param basis the identity (initial default value) for the reduction
4154	+	* @param reducer a commutative associative combining function
4155	+	* @return the result of accumulating the given transformation
4156	+	* of all (key, value) pairs
4157	+	*/
4158	+	public int reduceToIntInParallel
4159	+	(ObjectByObjectToInt<? super K, ? super V> transformer,
4160	+	int basis,
4161	+	IntByIntToInt reducer) {
4162	+	return ForkJoinTasks.reduceToInt
4163	+	(this, transformer, basis, reducer).invoke();
4164	+	}
4165	+
4166	+	/**
4167	+	* Performs the given action for each key.
4168	+	*
4169	+	* @param action the action
4170	+	*/
4171	+	public void forEachKeyInParallel(Action<K> action) {
4172	+	ForkJoinTasks.forEachKey
4173	+	(this, action).invoke();
4174	+	}
4175	+
4176	+	/**
4177	+	* Performs the given action for each non-null transformation
4178	+	* of each key.
4179	+	*
4180	+	* @param transformer a function returning the transformation
4181	+	* for an element, or null of there is no transformation (in
4182	+	* which case the action is not applied).
4183	+	* @param action the action
4184	+	*/
4185	+	public <U> void forEachKeyInParallel
4186	+	(Fun<? super K, ? extends U> transformer,
4187	+	Action<U> action) {
4188	+	ForkJoinTasks.forEachKey
4189	+	(this, transformer, action).invoke();
4190	+	}
4191	+
4192	+	/**
4193	+	* Returns a non-null result from applying the given search
4194	+	* function on each key, or null if none. Upon success,
4195	+	* further element processing is suppressed and the results of
4196	+	* any other parallel invocations of the search function are
4197	+	* ignored.
4198	+	*
4199	+	* @param searchFunction a function returning a non-null
4200	+	* result on success, else null
4201	+	* @return a non-null result from applying the given search
4202	+	* function on each key, or null if none
4203	+	*/
4204	+	public <U> U searchKeysInParallel
4205	+	(Fun<? super K, ? extends U> searchFunction) {
4206	+	return ForkJoinTasks.searchKeys
4207	+	(this, searchFunction).invoke();
4208	+	}
4209	+
4210	+	/**
4211	+	* Returns the result of accumulating all keys using the given
4212	+	* reducer to combine values, or null if none.
4213	+	*
4214	+	* @param reducer a commutative associative combining function
4215	+	* @return the result of accumulating all keys using the given
4216	+	* reducer to combine values, or null if none
4217	+	*/
4218	+	public K reduceKeysInParallel
4219	+	(BiFun<? super K, ? super K, ? extends K> reducer) {
4220	+	return ForkJoinTasks.reduceKeys
4221	+	(this, reducer).invoke();
4222	+	}
4223	+
4224	+	/**
4225	+	* Returns the result of accumulating the given transformation
4226	+	* of all keys using the given reducer to combine values, or
4227	+	* null if none.
4228	+	*
4229	+	* @param transformer a function returning the transformation
4230	+	* for an element, or null of there is no transformation (in
4231	+	* which case it is not combined).
4232	+	* @param reducer a commutative associative combining function
4233	+	* @return the result of accumulating the given transformation
4234	+	* of all keys
4235	+	*/
4236	+	public <U> U reduceKeysInParallel
4237	+	(Fun<? super K, ? extends U> transformer,
4238	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4239	+	return ForkJoinTasks.reduceKeys
4240	+	(this, transformer, reducer).invoke();
4241	+	}
4242	+
4243	+	/**
4244	+	* Returns the result of accumulating the given transformation
4245	+	* of all keys using the given reducer to combine values, and
4246	+	* the given basis as an identity value.
4247	+	*
4248	+	* @param transformer a function returning the transformation
4249	+	* for an element
4250	+	* @param basis the identity (initial default value) for the reduction
4251	+	* @param reducer a commutative associative combining function
4252	+	* @return  the result of accumulating the given transformation
4253	+	* of all keys
4254	+	*/
4255	+	public double reduceKeysToDoubleInParallel
4256	+	(ObjectToDouble<? super K> transformer,
4257	+	double basis,
4258	+	DoubleByDoubleToDouble reducer) {
4259	+	return ForkJoinTasks.reduceKeysToDouble
4260	+	(this, transformer, basis, reducer).invoke();
4261	+	}
4262	+
4263	+	/**
4264	+	* Returns the result of accumulating the given transformation
4265	+	* of all keys using the given reducer to combine values, and
4266	+	* the given basis as an identity value.
4267	+	*
4268	+	* @param transformer a function returning the transformation
4269	+	* for an element
4270	+	* @param basis the identity (initial default value) for the reduction
4271	+	* @param reducer a commutative associative combining function
4272	+	* @return the result of accumulating the given transformation
4273	+	* of all keys
4274	+	*/
4275	+	public long reduceKeysToLongInParallel
4276	+	(ObjectToLong<? super K> transformer,
4277	+	long basis,
4278	+	LongByLongToLong reducer) {
4279	+	return ForkJoinTasks.reduceKeysToLong
4280	+	(this, transformer, basis, reducer).invoke();
4281	+	}
4282	+
4283	+	/**
4284	+	* Returns the result of accumulating the given transformation
4285	+	* of all keys using the given reducer to combine values, and
4286	+	* the given basis as an identity value.
4287	+	*
4288	+	* @param transformer a function returning the transformation
4289	+	* for an element
4290	+	* @param basis the identity (initial default value) for the reduction
4291	+	* @param reducer a commutative associative combining function
4292	+	* @return the result of accumulating the given transformation
4293	+	* of all keys
4294	+	*/
4295	+	public int reduceKeysToIntInParallel
4296	+	(ObjectToInt<? super K> transformer,
4297	+	int basis,
4298	+	IntByIntToInt reducer) {
4299	+	return ForkJoinTasks.reduceKeysToInt
4300	+	(this, transformer, basis, reducer).invoke();
4301	+	}
4302	+
4303	+	/**
4304	+	* Performs the given action for each value.
4305	+	*
4306	+	* @param action the action
4307	+	*/
4308	+	public void forEachValueInParallel(Action<V> action) {
4309	+	ForkJoinTasks.forEachValue
4310	+	(this, action).invoke();
4311	+	}
4312	+
4313	+	/**
4314	+	* Performs the given action for each non-null transformation
4315	+	* of each value.
4316	+	*
4317	+	* @param transformer a function returning the transformation
4318	+	* for an element, or null of there is no transformation (in
4319	+	* which case the action is not applied).
4320	+	*/
4321	+	public <U> void forEachValueInParallel
4322	+	(Fun<? super V, ? extends U> transformer,
4323	+	Action<U> action) {
4324	+	ForkJoinTasks.forEachValue
4325	+	(this, transformer, action).invoke();
4326	+	}
4327	+
4328	+	/**
4329	+	* Returns a non-null result from applying the given search
4330	+	* function on each value, or null if none.  Upon success,
4331	+	* further element processing is suppressed and the results of
4332	+	* any other parallel invocations of the search function are
4333	+	* ignored.
4334	+	*
4335	+	* @param searchFunction a function returning a non-null
4336	+	* result on success, else null
4337	+	* @return a non-null result from applying the given search
4338	+	* function on each value, or null if none
4339	+	*/
4340	+	public <U> U searchValuesInParallel
4341	+	(Fun<? super V, ? extends U> searchFunction) {
4342	+	return ForkJoinTasks.searchValues
4343	+	(this, searchFunction).invoke();
4344	+	}
4345	+
4346	+	/**
4347	+	* Returns the result of accumulating all values using the
4348	+	* given reducer to combine values, or null if none.
4349	+	*
4350	+	* @param reducer a commutative associative combining function
4351	+	* @return  the result of accumulating all values
4352	+	*/
4353	+	public V reduceValuesInParallel
4354	+	(BiFun<? super V, ? super V, ? extends V> reducer) {
4355	+	return ForkJoinTasks.reduceValues
4356	+	(this, reducer).invoke();
4357	+	}
4358	+
4359	+	/**
4360	+	* Returns the result of accumulating the given transformation
4361	+	* of all values using the given reducer to combine values, or
4362	+	* null if none.
4363	+	*
4364	+	* @param transformer a function returning the transformation
4365	+	* for an element, or null of there is no transformation (in
4366	+	* which case it is not combined).
4367	+	* @param reducer a commutative associative combining function
4368	+	* @return the result of accumulating the given transformation
4369	+	* of all values
4370	+	*/
4371	+	public <U> U reduceValuesInParallel
4372	+	(Fun<? super V, ? extends U> transformer,
4373	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4374	+	return ForkJoinTasks.reduceValues
4375	+	(this, transformer, reducer).invoke();
4376	+	}
4377	+
4378	+	/**
4379	+	* Returns the result of accumulating the given transformation
4380	+	* of all values using the given reducer to combine values,
4381	+	* and the given basis as an identity value.
4382	+	*
4383	+	* @param transformer a function returning the transformation
4384	+	* for an element
4385	+	* @param basis the identity (initial default value) for the reduction
4386	+	* @param reducer a commutative associative combining function
4387	+	* @return the result of accumulating the given transformation
4388	+	* of all values
4389	+	*/
4390	+	public double reduceValuesToDoubleInParallel
4391	+	(ObjectToDouble<? super V> transformer,
4392	+	double basis,
4393	+	DoubleByDoubleToDouble reducer) {
4394	+	return ForkJoinTasks.reduceValuesToDouble
4395	+	(this, transformer, basis, reducer).invoke();
4396	+	}
4397	+
4398	+	/**
4399	+	* Returns the result of accumulating the given transformation
4400	+	* of all values using the given reducer to combine values,
4401	+	* and the given basis as an identity value.
4402	+	*
4403	+	* @param transformer a function returning the transformation
4404	+	* for an element
4405	+	* @param basis the identity (initial default value) for the reduction
4406	+	* @param reducer a commutative associative combining function
4407	+	* @return the result of accumulating the given transformation
4408	+	* of all values
4409	+	*/
4410	+	public long reduceValuesToLongInParallel
4411	+	(ObjectToLong<? super V> transformer,
4412	+	long basis,
4413	+	LongByLongToLong reducer) {
4414	+	return ForkJoinTasks.reduceValuesToLong
4415	+	(this, transformer, basis, reducer).invoke();
4416	+	}
4417	+
4418	+	/**
4419	+	* Returns the result of accumulating the given transformation
4420	+	* of all values using the given reducer to combine values,
4421	+	* and the given basis as an identity value.
4422	+	*
4423	+	* @param transformer a function returning the transformation
4424	+	* for an element
4425	+	* @param basis the identity (initial default value) for the reduction
4426	+	* @param reducer a commutative associative combining function
4427	+	* @return the result of accumulating the given transformation
4428	+	* of all values
4429	+	*/
4430	+	public int reduceValuesToIntInParallel
4431	+	(ObjectToInt<? super V> transformer,
4432	+	int basis,
4433	+	IntByIntToInt reducer) {
4434	+	return ForkJoinTasks.reduceValuesToInt
4435	+	(this, transformer, basis, reducer).invoke();
4436	+	}
4437	+
4438	+	/**
4439	+	* Performs the given action for each entry.
4440	+	*
4441	+	* @param action the action
4442	+	*/
4443	+	public void forEachEntryInParallel(Action<Map.Entry<K,V>> action) {
4444	+	ForkJoinTasks.forEachEntry
4445	+	(this, action).invoke();
4446	+	}
4447	+
4448	+	/**
4449	+	* Performs the given action for each non-null transformation
4450	+	* of each entry.
4451	+	*
4452	+	* @param transformer a function returning the transformation
4453	+	* for an element, or null of there is no transformation (in
4454	+	* which case the action is not applied).
4455	+	* @param action the action
4456	+	*/
4457	+	public <U> void forEachEntryInParallel
4458	+	(Fun<Map.Entry<K,V>, ? extends U> transformer,
4459	+	Action<U> action) {
4460	+	ForkJoinTasks.forEachEntry
4461	+	(this, transformer, action).invoke();
4462	+	}
4463	+
4464	+	/**
4465	+	* Returns a non-null result from applying the given search
4466	+	* function on each entry, or null if none.  Upon success,
4467	+	* further element processing is suppressed and the results of
4468	+	* any other parallel invocations of the search function are
4469	+	* ignored.
4470	+	*
4471	+	* @param searchFunction a function returning a non-null
4472	+	* result on success, else null
4473	+	* @return a non-null result from applying the given search
4474	+	* function on each entry, or null if none
4475	+	*/
4476	+	public <U> U searchEntriesInParallel
4477	+	(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4478	+	return ForkJoinTasks.searchEntries
4479	+	(this, searchFunction).invoke();
4480	+	}
4481	+
4482	+	/**
4483	+	* Returns the result of accumulating all entries using the
4484	+	* given reducer to combine values, or null if none.
4485	+	*
4486	+	* @param reducer a commutative associative combining function
4487	+	* @return the result of accumulating all entries
4488	+	*/
4489	+	public Map.Entry<K,V> reduceEntriesInParallel
4490	+	(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4491	+	return ForkJoinTasks.reduceEntries
4492	+	(this, reducer).invoke();
4493	+	}
4494	+
4495	+	/**
4496	+	* Returns the result of accumulating the given transformation
4497	+	* of all entries using the given reducer to combine values,
4498	+	* or null if none.
4499	+	*
4500	+	* @param transformer a function returning the transformation
4501	+	* for an element, or null of there is no transformation (in
4502	+	* which case it is not combined).
4503	+	* @param reducer a commutative associative combining function
4504	+	* @return the result of accumulating the given transformation
4505	+	* of all entries
4506	+	*/
4507	+	public <U> U reduceEntriesInParallel
4508	+	(Fun<Map.Entry<K,V>, ? extends U> transformer,
4509	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4510	+	return ForkJoinTasks.reduceEntries
4511	+	(this, transformer, reducer).invoke();
4512	+	}
4513	+
4514	+	/**
4515	+	* Returns the result of accumulating the given transformation
4516	+	* of all entries using the given reducer to combine values,
4517	+	* and the given basis as an identity value.
4518	+	*
4519	+	* @param transformer a function returning the transformation
4520	+	* for an element
4521	+	* @param basis the identity (initial default value) for the reduction
4522	+	* @param reducer a commutative associative combining function
4523	+	* @return the result of accumulating the given transformation
4524	+	* of all entries
4525	+	*/
4526	+	public double reduceEntriesToDoubleInParallel
4527	+	(ObjectToDouble<Map.Entry<K,V>> transformer,
4528	+	double basis,
4529	+	DoubleByDoubleToDouble reducer) {
4530	+	return ForkJoinTasks.reduceEntriesToDouble
4531	+	(this, transformer, basis, reducer).invoke();
4532	+	}
4533	+
4534	+	/**
4535	+	* Returns the result of accumulating the given transformation
4536	+	* of all entries using the given reducer to combine values,
4537	+	* and the given basis as an identity value.
4538	+	*
4539	+	* @param transformer a function returning the transformation
4540	+	* for an element
4541	+	* @param basis the identity (initial default value) for the reduction
4542	+	* @param reducer a commutative associative combining function
4543	+	* @return  the result of accumulating the given transformation
4544	+	* of all entries
4545	+	*/
4546	+	public long reduceEntriesToLongInParallel
4547	+	(ObjectToLong<Map.Entry<K,V>> transformer,
4548	+	long basis,
4549	+	LongByLongToLong reducer) {
4550	+	return ForkJoinTasks.reduceEntriesToLong
4551	+	(this, transformer, basis, reducer).invoke();
4552	+	}
4553	+
4554	+	/**
4555	+	* Returns the result of accumulating the given transformation
4556	+	* of all entries using the given reducer to combine values,
4557	+	* and the given basis as an identity value.
4558	+	*
4559	+	* @param transformer a function returning the transformation
4560	+	* for an element
4561	+	* @param basis the identity (initial default value) for the reduction
4562	+	* @param reducer a commutative associative combining function
4563	+	* @return the result of accumulating the given transformation
4564	+	* of all entries
4565	+	*/
4566	+	public int reduceEntriesToIntInParallel
4567	+	(ObjectToInt<Map.Entry<K,V>> transformer,
4568	+	int basis,
4569	+	IntByIntToInt reducer) {
4570	+	return ForkJoinTasks.reduceEntriesToInt
4571	+	(this, transformer, basis, reducer).invoke();
4572	+	}
4573	+
4574	+
4575		/* ----------------Views -------------- */
4576
4577		/**
4578		* Base class for views.
4579		*/
4580	<	static abstract class MapView<K, V> {
4580	>	static abstract class CHMView<K, V> {
4581		final ConcurrentHashMapV8<K, V> map;
4582	<	MapView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
4582	>	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
4583	>
4584	>	/**
4585	>	* Returns the map backing this view.
4586	>	*
4587	>	* @return the map backing this view
4588	>	*/
4589	>	public ConcurrentHashMapV8<K,V> getMap() { return map; }
4590	>
4591		public final int size()                 { return map.size(); }
4592		public final boolean isEmpty()          { return map.isEmpty(); }
4593		public final void clear()               { map.clear(); }
#	Line 2987 | Line 4600 | public class ConcurrentHashMapV8<K, V>
4600		private static final String oomeMsg = "Required array size too large";
4601
4602		public final Object[] toArray() {
4603	<	long sz = map.longSize();
4603	>	long sz = map.mappingCount();
4604		if (sz > (long)(MAX_ARRAY_SIZE))
4605		throw new OutOfMemoryError(oomeMsg);
4606		int n = (int)sz;
#	Line 3009 | Line 4622 | public class ConcurrentHashMapV8<K, V>
4622		return (i == n) ? r : Arrays.copyOf(r, i);
4623		}
4624
4625	<	@SuppressWarnings("unchecked")
4626	<	public final <T> T[] toArray(T[] a) {
3014	<	long sz = map.longSize();
4625	>	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4626	>	long sz = map.mappingCount();
4627		if (sz > (long)(MAX_ARRAY_SIZE))
4628		throw new OutOfMemoryError(oomeMsg);
4629		int m = (int)sz;
#	Line 3098 | Line 4710 | public class ConcurrentHashMapV8<K, V>
4710
4711		}
4712
4713	<	static final class KeySet<K,V> extends MapView<K,V> implements Set<K> {
4714	<	KeySet(ConcurrentHashMapV8<K, V> map)   { super(map); }
4715	<	public final boolean contains(Object o) { return map.containsKey(o); }
4716	<	public final boolean remove(Object o)   { return map.remove(o) != null; }
4717	<	public final Iterator<K> iterator() {
4718	<	return new KeyIterator<K,V>(map);
4713	>	/**
4714	>	* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4715	>	* which additions may optionally be enabled by mapping to a
4716	>	* common value.  This class cannot be directly instantiated. See
4717	>	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4718	>	* {@link #newKeySet(int)}.
4719	>	*/
4720	>	public static class KeySetView<K,V> extends CHMView<K,V>
4721	>	implements Set<K>, java.io.Serializable {
4722	>	private static final long serialVersionUID = 7249069246763182397L;
4723	>	private final V value;
4724	>	KeySetView(ConcurrentHashMapV8<K, V> map, V value) {  // non-public
4725	>	super(map);
4726	>	this.value = value;
4727		}
4728	<	public final boolean add(K e) {
4729	<	throw new UnsupportedOperationException();
4728	>
4729	>	/**
4730	>	* Returns the default mapped value for additions,
4731	>	* or {@code null} if additions are not supported.
4732	>	*
4733	>	* @return the default mapped value for additions, or {@code null}
4734	>	* if not supported.
4735	>	*/
4736	>	public V getMappedValue() { return value; }
4737	>
4738	>	// implement Set API
4739	>
4740	>	public boolean contains(Object o) { return map.containsKey(o); }
4741	>	public boolean remove(Object o)   { return map.remove(o) != null; }
4742	>
4743	>	/**
4744	>	* Returns a "weakly consistent" iterator that will never
4745	>	* throw {@link ConcurrentModificationException}, and
4746	>	* guarantees to traverse elements as they existed upon
4747	>	* construction of the iterator, and may (but is not
4748	>	* guaranteed to) reflect any modifications subsequent to
4749	>	* construction.
4750	>	*
4751	>	* @return an iterator over the keys of this map
4752	>	*/
4753	>	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4754	>	public boolean add(K e) {
4755	>	V v;
4756	>	if ((v = value) == null)
4757	>	throw new UnsupportedOperationException();
4758	>	if (e == null)
4759	>	throw new NullPointerException();
4760	>	return map.internalPut(e, v, true) == null;
4761		}
4762	<	public final boolean addAll(Collection<? extends K> c) {
4763	<	throw new UnsupportedOperationException();
4762	>	public boolean addAll(Collection<? extends K> c) {
4763	>	boolean added = false;
4764	>	V v;
4765	>	if ((v = value) == null)
4766	>	throw new UnsupportedOperationException();
4767	>	for (K e : c) {
4768	>	if (e == null)
4769	>	throw new NullPointerException();
4770	>	if (map.internalPut(e, v, true) == null)
4771	>	added = true;
4772	>	}
4773	>	return added;
4774		}
4775		public boolean equals(Object o) {
4776		Set<?> c;
#	Line 3119 | Line 4780 | public class ConcurrentHashMapV8<K, V>
4780		}
4781		}
4782
4783	<	static final class Values<K,V> extends MapView<K,V>
4783	>	/**
4784	>	* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4785	>	* values, in which additions are disabled. This class cannot be
4786	>	* directly instantiated. See {@link #values},
4787	>	*
4788	>	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4789	>	* that will never throw {@link ConcurrentModificationException},
4790	>	* and guarantees to traverse elements as they existed upon
4791	>	* construction of the iterator, and may (but is not guaranteed to)
4792	>	* reflect any modifications subsequent to construction.
4793	>	*/
4794	>	public static final class ValuesView<K,V> extends CHMView<K,V>
4795		implements Collection<V> {
4796	<	Values(ConcurrentHashMapV8<K, V> map)   { super(map); }
4796	>	ValuesView(ConcurrentHashMapV8<K, V> map)   { super(map); }
4797		public final boolean contains(Object o) { return map.containsValue(o); }
4798		public final boolean remove(Object o) {
4799		if (o != null) {
#	Line 3135 | Line 4807 | public class ConcurrentHashMapV8<K, V>
4807		}
4808		return false;
4809		}
4810	+
4811	+	/**
4812	+	* Returns a "weakly consistent" iterator that will never
4813	+	* throw {@link ConcurrentModificationException}, and
4814	+	* guarantees to traverse elements as they existed upon
4815	+	* construction of the iterator, and may (but is not
4816	+	* guaranteed to) reflect any modifications subsequent to
4817	+	* construction.
4818	+	*
4819	+	* @return an iterator over the values of this map
4820	+	*/
4821		public final Iterator<V> iterator() {
4822		return new ValueIterator<K,V>(map);
4823		}
#	Line 3144 | Line 4827 | public class ConcurrentHashMapV8<K, V>
4827		public final boolean addAll(Collection<? extends V> c) {
4828		throw new UnsupportedOperationException();
4829		}
4830	+
4831		}
4832
4833	<	static final class EntrySet<K,V> extends MapView<K,V>
4833	>	/**
4834	>	* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4835	>	* entries.  This class cannot be directly instantiated. See
4836	>	* {@link #entrySet}.
4837	>	*/
4838	>	public static final class EntrySetView<K,V> extends CHMView<K,V>
4839		implements Set<Map.Entry<K,V>> {
4840	<	EntrySet(ConcurrentHashMapV8<K, V> map) { super(map); }
4840	>	EntrySetView(ConcurrentHashMapV8<K, V> map) { super(map); }
4841		public final boolean contains(Object o) {
4842		Object k, v, r; Map.Entry<?,?> e;
4843		return ((o instanceof Map.Entry) &&
#	Line 3164 | Line 4853 | public class ConcurrentHashMapV8<K, V>
4853		(v = e.getValue()) != null &&
4854		map.remove(k, v));
4855		}
4856	+
4857	+	/**
4858	+	* Returns a "weakly consistent" iterator that will never
4859	+	* throw {@link ConcurrentModificationException}, and
4860	+	* guarantees to traverse elements as they existed upon
4861	+	* construction of the iterator, and may (but is not
4862	+	* guaranteed to) reflect any modifications subsequent to
4863	+	* construction.
4864	+	*
4865	+	* @return an iterator over the entries of this map
4866	+	*/
4867		public final Iterator<Map.Entry<K,V>> iterator() {
4868		return new EntryIterator<K,V>(map);
4869		}
4870	+
4871		public final boolean add(Entry<K,V> e) {
4872	<	throw new UnsupportedOperationException();
4872	>	K key = e.getKey();
4873	>	V value = e.getValue();
4874	>	if (key == null || value == null)
4875	>	throw new NullPointerException();
4876	>	return map.internalPut(key, value, false) == null;
4877		}
4878		public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4879	<	throw new UnsupportedOperationException();
4879	>	boolean added = false;
4880	>	for (Entry<K,V> e : c) {
4881	>	if (add(e))
4882	>	added = true;
4883	>	}
4884	>	return added;
4885		}
4886		public boolean equals(Object o) {
4887		Set<?> c;
#	Line 3181 | Line 4891 | public class ConcurrentHashMapV8<K, V>
4891		}
4892		}
4893
4894	<	/* ---------------- Serialization Support -------------- */
4894	>	// ---------------------------------------------------------------------
4895
4896		/**
4897	<	* Stripped-down version of helper class used in previous version,
4898	<	* declared for the sake of serialization compatibility
4897	>	* Predefined tasks for performing bulk parallel operations on
4898	>	* ConcurrentHashMapV8s. These tasks follow the forms and rules used
4899	>	* for bulk operations. Each method has the same name, but returns
4900	>	* a task rather than invoking it. These methods may be useful in
4901	>	* custom applications such as submitting a task without waiting
4902	>	* for completion, using a custom pool, or combining with other
4903	>	* tasks.
4904		*/
4905	<	static class Segment<K,V> implements Serializable {
4906	<	private static final long serialVersionUID = 2249069246763182397L;
3192	<	final float loadFactor;
3193	<	Segment(float lf) { this.loadFactor = lf; }
3194	<	}
4905	>	public static class ForkJoinTasks {
4906	>	private ForkJoinTasks() {}
4907
4908	<	/**
4909	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
4910	<	* stream (i.e., serializes it).
4911	<	* @param s the stream
4912	<	* @serialData
4913	<	* the key (Object) and value (Object)
4914	<	* for each key-value mapping, followed by a null pair.
4915	<	* The key-value mappings are emitted in no particular order.
4916	<	*/
4917	<	@SuppressWarnings("unchecked")
4918	<	private void writeObject(java.io.ObjectOutputStream s)
4919	<	throws java.io.IOException {
4920	<	if (segments == null) { // for serialization compatibility
3209	<	segments = (Segment<K,V>[])
3210	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
3211	<	for (int i = 0; i < segments.length; ++i)
3212	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
4908	>	/**
4909	>	* Returns a task that when invoked, performs the given
4910	>	* action for each (key, value)
4911	>	*
4912	>	* @param map the map
4913	>	* @param action the action
4914	>	* @return the task
4915	>	*/
4916	>	public static <K,V> ForkJoinTask<Void> forEach
4917	>	(ConcurrentHashMapV8<K,V> map,
4918	>	BiAction<K,V> action) {
4919	>	if (action == null) throw new NullPointerException();
4920	>	return new ForEachMappingTask<K,V>(map, null, -1, action);
4921		}
4922	<	s.defaultWriteObject();
4923	<	InternalIterator<K,V> it = new InternalIterator<K,V>(this);
4924	<	Object v;
4925	<	while ((v = it.advance()) != null) {
4926	<	s.writeObject(it.nextKey);
4927	<	s.writeObject(v);
4922	>
4923	>	/**
4924	>	* Returns a task that when invoked, performs the given
4925	>	* action for each non-null transformation of each (key, value)
4926	>	*
4927	>	* @param map the map
4928	>	* @param transformer a function returning the transformation
4929	>	* for an element, or null if there is no transformation (in
4930	>	* which case the action is not applied)
4931	>	* @param action the action
4932	>	* @return the task
4933	>	*/
4934	>	public static <K,V,U> ForkJoinTask<Void> forEach
4935	>	(ConcurrentHashMapV8<K,V> map,
4936	>	BiFun<? super K, ? super V, ? extends U> transformer,
4937	>	Action<U> action) {
4938	>	if (transformer == null || action == null)
4939	>	throw new NullPointerException();
4940	>	return new ForEachTransformedMappingTask<K,V,U>
4941	>	(map, null, -1, transformer, action);
4942	>	}
4943	>
4944	>	/**
4945	>	* Returns a task that when invoked, returns a non-null result
4946	>	* from applying the given search function on each (key,
4947	>	* value), or null if none. Upon success, further element
4948	>	* processing is suppressed and the results of any other
4949	>	* parallel invocations of the search function are ignored.
4950	>	*
4951	>	* @param map the map
4952	>	* @param searchFunction a function returning a non-null
4953	>	* result on success, else null
4954	>	* @return the task
4955	>	*/
4956	>	public static <K,V,U> ForkJoinTask<U> search
4957	>	(ConcurrentHashMapV8<K,V> map,
4958	>	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4959	>	if (searchFunction == null) throw new NullPointerException();
4960	>	return new SearchMappingsTask<K,V,U>
4961	>	(map, null, -1, searchFunction,
4962	>	new AtomicReference<U>());
4963	>	}
4964	>
4965	>	/**
4966	>	* Returns a task that when invoked, returns the result of
4967	>	* accumulating the given transformation of all (key, value) pairs
4968	>	* using the given reducer to combine values, or null if none.
4969	>	*
4970	>	* @param map the map
4971	>	* @param transformer a function returning the transformation
4972	>	* for an element, or null if there is no transformation (in
4973	>	* which case it is not combined).
4974	>	* @param reducer a commutative associative combining function
4975	>	* @return the task
4976	>	*/
4977	>	public static <K,V,U> ForkJoinTask<U> reduce
4978	>	(ConcurrentHashMapV8<K,V> map,
4979	>	BiFun<? super K, ? super V, ? extends U> transformer,
4980	>	BiFun<? super U, ? super U, ? extends U> reducer) {
4981	>	if (transformer == null || reducer == null)
4982	>	throw new NullPointerException();
4983	>	return new MapReduceMappingsTask<K,V,U>
4984	>	(map, null, -1, null, transformer, reducer);
4985	>	}
4986	>
4987	>	/**
4988	>	* Returns a task that when invoked, returns the result of
4989	>	* accumulating the given transformation of all (key, value) pairs
4990	>	* using the given reducer to combine values, and the given
4991	>	* basis as an identity value.
4992	>	*
4993	>	* @param map the map
4994	>	* @param transformer a function returning the transformation
4995	>	* for an element
4996	>	* @param basis the identity (initial default value) for the reduction
4997	>	* @param reducer a commutative associative combining function
4998	>	* @return the task
4999	>	*/
5000	>	public static <K,V> ForkJoinTask<Double> reduceToDouble
5001	>	(ConcurrentHashMapV8<K,V> map,
5002	>	ObjectByObjectToDouble<? super K, ? super V> transformer,
5003	>	double basis,
5004	>	DoubleByDoubleToDouble reducer) {
5005	>	if (transformer == null || reducer == null)
5006	>	throw new NullPointerException();
5007	>	return new MapReduceMappingsToDoubleTask<K,V>
5008	>	(map, null, -1, null, transformer, basis, reducer);
5009	>	}
5010	>
5011	>	/**
5012	>	* Returns a task that when invoked, returns the result of
5013	>	* accumulating the given transformation of all (key, value) pairs
5014	>	* using the given reducer to combine values, and the given
5015	>	* basis as an identity value.
5016	>	*
5017	>	* @param map the map
5018	>	* @param transformer a function returning the transformation
5019	>	* for an element
5020	>	* @param basis the identity (initial default value) for the reduction
5021	>	* @param reducer a commutative associative combining function
5022	>	* @return the task
5023	>	*/
5024	>	public static <K,V> ForkJoinTask<Long> reduceToLong
5025	>	(ConcurrentHashMapV8<K,V> map,
5026	>	ObjectByObjectToLong<? super K, ? super V> transformer,
5027	>	long basis,
5028	>	LongByLongToLong reducer) {
5029	>	if (transformer == null || reducer == null)
5030	>	throw new NullPointerException();
5031	>	return new MapReduceMappingsToLongTask<K,V>
5032	>	(map, null, -1, null, transformer, basis, reducer);
5033	>	}
5034	>
5035	>	/**
5036	>	* Returns a task that when invoked, returns the result of
5037	>	* accumulating the given transformation of all (key, value) pairs
5038	>	* using the given reducer to combine values, and the given
5039	>	* basis as an identity value.
5040	>	*
5041	>	* @param transformer a function returning the transformation
5042	>	* for an element
5043	>	* @param basis the identity (initial default value) for the reduction
5044	>	* @param reducer a commutative associative combining function
5045	>	* @return the task
5046	>	*/
5047	>	public static <K,V> ForkJoinTask<Integer> reduceToInt
5048	>	(ConcurrentHashMapV8<K,V> map,
5049	>	ObjectByObjectToInt<? super K, ? super V> transformer,
5050	>	int basis,
5051	>	IntByIntToInt reducer) {
5052	>	if (transformer == null || reducer == null)
5053	>	throw new NullPointerException();
5054	>	return new MapReduceMappingsToIntTask<K,V>
5055	>	(map, null, -1, null, transformer, basis, reducer);
5056	>	}
5057	>
5058	>	/**
5059	>	* Returns a task that when invoked, performs the given action
5060	>	* for each key.
5061	>	*
5062	>	* @param map the map
5063	>	* @param action the action
5064	>	* @return the task
5065	>	*/
5066	>	public static <K,V> ForkJoinTask<Void> forEachKey
5067	>	(ConcurrentHashMapV8<K,V> map,
5068	>	Action<K> action) {
5069	>	if (action == null) throw new NullPointerException();
5070	>	return new ForEachKeyTask<K,V>(map, null, -1, action);
5071	>	}
5072	>
5073	>	/**
5074	>	* Returns a task that when invoked, performs the given action
5075	>	* for each non-null transformation of each key.
5076	>	*
5077	>	* @param map the map
5078	>	* @param transformer a function returning the transformation
5079	>	* for an element, or null if there is no transformation (in
5080	>	* which case the action is not applied)
5081	>	* @param action the action
5082	>	* @return the task
5083	>	*/
5084	>	public static <K,V,U> ForkJoinTask<Void> forEachKey
5085	>	(ConcurrentHashMapV8<K,V> map,
5086	>	Fun<? super K, ? extends U> transformer,
5087	>	Action<U> action) {
5088	>	if (transformer == null || action == null)
5089	>	throw new NullPointerException();
5090	>	return new ForEachTransformedKeyTask<K,V,U>
5091	>	(map, null, -1, transformer, action);
5092	>	}
5093	>
5094	>	/**
5095	>	* Returns a task that when invoked, returns a non-null result
5096	>	* from applying the given search function on each key, or
5097	>	* null if none.  Upon success, further element processing is
5098	>	* suppressed and the results of any other parallel
5099	>	* invocations of the search function are ignored.
5100	>	*
5101	>	* @param map the map
5102	>	* @param searchFunction a function returning a non-null
5103	>	* result on success, else null
5104	>	* @return the task
5105	>	*/
5106	>	public static <K,V,U> ForkJoinTask<U> searchKeys
5107	>	(ConcurrentHashMapV8<K,V> map,
5108	>	Fun<? super K, ? extends U> searchFunction) {
5109	>	if (searchFunction == null) throw new NullPointerException();
5110	>	return new SearchKeysTask<K,V,U>
5111	>	(map, null, -1, searchFunction,
5112	>	new AtomicReference<U>());
5113	>	}
5114	>
5115	>	/**
5116	>	* Returns a task that when invoked, returns the result of
5117	>	* accumulating all keys using the given reducer to combine
5118	>	* values, or null if none.
5119	>	*
5120	>	* @param map the map
5121	>	* @param reducer a commutative associative combining function
5122	>	* @return the task
5123	>	*/
5124	>	public static <K,V> ForkJoinTask<K> reduceKeys
5125	>	(ConcurrentHashMapV8<K,V> map,
5126	>	BiFun<? super K, ? super K, ? extends K> reducer) {
5127	>	if (reducer == null) throw new NullPointerException();
5128	>	return new ReduceKeysTask<K,V>
5129	>	(map, null, -1, null, reducer);
5130	>	}
5131	>
5132	>	/**
5133	>	* Returns a task that when invoked, returns the result of
5134	>	* accumulating the given transformation of all keys using the given
5135	>	* reducer to combine values, or null if none.
5136	>	*
5137	>	* @param map the map
5138	>	* @param transformer a function returning the transformation
5139	>	* for an element, or null if there is no transformation (in
5140	>	* which case it is not combined).
5141	>	* @param reducer a commutative associative combining function
5142	>	* @return the task
5143	>	*/
5144	>	public static <K,V,U> ForkJoinTask<U> reduceKeys
5145	>	(ConcurrentHashMapV8<K,V> map,
5146	>	Fun<? super K, ? extends U> transformer,
5147	>	BiFun<? super U, ? super U, ? extends U> reducer) {
5148	>	if (transformer == null || reducer == null)
5149	>	throw new NullPointerException();
5150	>	return new MapReduceKeysTask<K,V,U>
5151	>	(map, null, -1, null, transformer, reducer);
5152	>	}
5153	>
5154	>	/**
5155	>	* Returns a task that when invoked, returns the result of
5156	>	* accumulating the given transformation of all keys using the given
5157	>	* reducer to combine values, and the given basis as an
5158	>	* identity value.
5159	>	*
5160	>	* @param map the map
5161	>	* @param transformer a function returning the transformation
5162	>	* for an element
5163	>	* @param basis the identity (initial default value) for the reduction
5164	>	* @param reducer a commutative associative combining function
5165	>	* @return the task
5166	>	*/
5167	>	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
5168	>	(ConcurrentHashMapV8<K,V> map,
5169	>	ObjectToDouble<? super K> transformer,
5170	>	double basis,
5171	>	DoubleByDoubleToDouble reducer) {
5172	>	if (transformer == null || reducer == null)
5173	>	throw new NullPointerException();
5174	>	return new MapReduceKeysToDoubleTask<K,V>
5175	>	(map, null, -1, null, transformer, basis, reducer);
5176	>	}
5177	>
5178	>	/**
5179	>	* Returns a task that when invoked, returns the result of
5180	>	* accumulating the given transformation of all keys using the given
5181	>	* reducer to combine values, and the given basis as an
5182	>	* identity value.
5183	>	*
5184	>	* @param map the map
5185	>	* @param transformer a function returning the transformation
5186	>	* for an element
5187	>	* @param basis the identity (initial default value) for the reduction
5188	>	* @param reducer a commutative associative combining function
5189	>	* @return the task
5190	>	*/
5191	>	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
5192	>	(ConcurrentHashMapV8<K,V> map,
5193	>	ObjectToLong<? super K> transformer,
5194	>	long basis,
5195	>	LongByLongToLong reducer) {
5196	>	if (transformer == null || reducer == null)
5197	>	throw new NullPointerException();
5198	>	return new MapReduceKeysToLongTask<K,V>
5199	>	(map, null, -1, null, transformer, basis, reducer);
5200	>	}
5201	>
5202	>	/**
5203	>	* Returns a task that when invoked, returns the result of
5204	>	* accumulating the given transformation of all keys using the given
5205	>	* reducer to combine values, and the given basis as an
5206	>	* identity value.
5207	>	*
5208	>	* @param map the map
5209	>	* @param transformer a function returning the transformation
5210	>	* for an element
5211	>	* @param basis the identity (initial default value) for the reduction
5212	>	* @param reducer a commutative associative combining function
5213	>	* @return the task
5214	>	*/
5215	>	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
5216	>	(ConcurrentHashMapV8<K,V> map,
5217	>	ObjectToInt<? super K> transformer,
5218	>	int basis,
5219	>	IntByIntToInt reducer) {
5220	>	if (transformer == null || reducer == null)
5221	>	throw new NullPointerException();
5222	>	return new MapReduceKeysToIntTask<K,V>
5223	>	(map, null, -1, null, transformer, basis, reducer);
5224	>	}
5225	>
5226	>	/**
5227	>	* Returns a task that when invoked, performs the given action
5228	>	* for each value.
5229	>	*
5230	>	* @param map the map
5231	>	* @param action the action
5232	>	*/
5233	>	public static <K,V> ForkJoinTask<Void> forEachValue
5234	>	(ConcurrentHashMapV8<K,V> map,
5235	>	Action<V> action) {
5236	>	if (action == null) throw new NullPointerException();
5237	>	return new ForEachValueTask<K,V>(map, null, -1, action);
5238	>	}
5239	>
5240	>	/**
5241	>	* Returns a task that when invoked, performs the given action
5242	>	* for each non-null transformation of each value.
5243	>	*
5244	>	* @param map the map
5245	>	* @param transformer a function returning the transformation
5246	>	* for an element, or null if there is no transformation (in
5247	>	* which case the action is not applied)
5248	>	* @param action the action
5249	>	*/
5250	>	public static <K,V,U> ForkJoinTask<Void> forEachValue
5251	>	(ConcurrentHashMapV8<K,V> map,
5252	>	Fun<? super V, ? extends U> transformer,
5253	>	Action<U> action) {
5254	>	if (transformer == null || action == null)
5255	>	throw new NullPointerException();
5256	>	return new ForEachTransformedValueTask<K,V,U>
5257	>	(map, null, -1, transformer, action);
5258	>	}
5259	>
5260	>	/**
5261	>	* Returns a task that when invoked, returns a non-null result
5262	>	* from applying the given search function on each value, or
5263	>	* null if none.  Upon success, further element processing is
5264	>	* suppressed and the results of any other parallel
5265	>	* invocations of the search function are ignored.
5266	>	*
5267	>	* @param map the map
5268	>	* @param searchFunction a function returning a non-null
5269	>	* result on success, else null
5270	>	* @return the task
5271	>	*/
5272	>	public static <K,V,U> ForkJoinTask<U> searchValues
5273	>	(ConcurrentHashMapV8<K,V> map,
5274	>	Fun<? super V, ? extends U> searchFunction) {
5275	>	if (searchFunction == null) throw new NullPointerException();
5276	>	return new SearchValuesTask<K,V,U>
5277	>	(map, null, -1, searchFunction,
5278	>	new AtomicReference<U>());
5279	>	}
5280	>
5281	>	/**
5282	>	* Returns a task that when invoked, returns the result of
5283	>	* accumulating all values using the given reducer to combine
5284	>	* values, or null if none.
5285	>	*
5286	>	* @param map the map
5287	>	* @param reducer a commutative associative combining function
5288	>	* @return the task
5289	>	*/
5290	>	public static <K,V> ForkJoinTask<V> reduceValues
5291	>	(ConcurrentHashMapV8<K,V> map,
5292	>	BiFun<? super V, ? super V, ? extends V> reducer) {
5293	>	if (reducer == null) throw new NullPointerException();
5294	>	return new ReduceValuesTask<K,V>
5295	>	(map, null, -1, null, reducer);
5296	>	}
5297	>
5298	>	/**
5299	>	* Returns a task that when invoked, returns the result of
5300	>	* accumulating the given transformation of all values using the
5301	>	* given reducer to combine values, or null if none.
5302	>	*
5303	>	* @param map the map
5304	>	* @param transformer a function returning the transformation
5305	>	* for an element, or null if there is no transformation (in
5306	>	* which case it is not combined).
5307	>	* @param reducer a commutative associative combining function
5308	>	* @return the task
5309	>	*/
5310	>	public static <K,V,U> ForkJoinTask<U> reduceValues
5311	>	(ConcurrentHashMapV8<K,V> map,
5312	>	Fun<? super V, ? extends U> transformer,
5313	>	BiFun<? super U, ? super U, ? extends U> reducer) {
5314	>	if (transformer == null || reducer == null)
5315	>	throw new NullPointerException();
5316	>	return new MapReduceValuesTask<K,V,U>
5317	>	(map, null, -1, null, transformer, reducer);
5318	>	}
5319	>
5320	>	/**
5321	>	* Returns a task that when invoked, returns the result of
5322	>	* accumulating the given transformation of all values using the
5323	>	* given reducer to combine values, and the given basis as an
5324	>	* identity value.
5325	>	*
5326	>	* @param map the map
5327	>	* @param transformer a function returning the transformation
5328	>	* for an element
5329	>	* @param basis the identity (initial default value) for the reduction
5330	>	* @param reducer a commutative associative combining function
5331	>	* @return the task
5332	>	*/
5333	>	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
5334	>	(ConcurrentHashMapV8<K,V> map,
5335	>	ObjectToDouble<? super V> transformer,
5336	>	double basis,
5337	>	DoubleByDoubleToDouble reducer) {
5338	>	if (transformer == null || reducer == null)
5339	>	throw new NullPointerException();
5340	>	return new MapReduceValuesToDoubleTask<K,V>
5341	>	(map, null, -1, null, transformer, basis, reducer);
5342	>	}
5343	>
5344	>	/**
5345	>	* Returns a task that when invoked, returns the result of
5346	>	* accumulating the given transformation of all values using the
5347	>	* given reducer to combine values, and the given basis as an
5348	>	* identity value.
5349	>	*
5350	>	* @param map the map
5351	>	* @param transformer a function returning the transformation
5352	>	* for an element
5353	>	* @param basis the identity (initial default value) for the reduction
5354	>	* @param reducer a commutative associative combining function
5355	>	* @return the task
5356	>	*/
5357	>	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
5358	>	(ConcurrentHashMapV8<K,V> map,
5359	>	ObjectToLong<? super V> transformer,
5360	>	long basis,
5361	>	LongByLongToLong reducer) {
5362	>	if (transformer == null || reducer == null)
5363	>	throw new NullPointerException();
5364	>	return new MapReduceValuesToLongTask<K,V>
5365	>	(map, null, -1, null, transformer, basis, reducer);
5366	>	}
5367	>
5368	>	/**
5369	>	* Returns a task that when invoked, returns the result of
5370	>	* accumulating the given transformation of all values using the
5371	>	* given reducer to combine values, and the given basis as an
5372	>	* identity value.
5373	>	*
5374	>	* @param map the map
5375	>	* @param transformer a function returning the transformation
5376	>	* for an element
5377	>	* @param basis the identity (initial default value) for the reduction
5378	>	* @param reducer a commutative associative combining function
5379	>	* @return the task
5380	>	*/
5381	>	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
5382	>	(ConcurrentHashMapV8<K,V> map,
5383	>	ObjectToInt<? super V> transformer,
5384	>	int basis,
5385	>	IntByIntToInt reducer) {
5386	>	if (transformer == null || reducer == null)
5387	>	throw new NullPointerException();
5388	>	return new MapReduceValuesToIntTask<K,V>
5389	>	(map, null, -1, null, transformer, basis, reducer);
5390	>	}
5391	>
5392	>	/**
5393	>	* Returns a task that when invoked, perform the given action
5394	>	* for each entry.
5395	>	*
5396	>	* @param map the map
5397	>	* @param action the action
5398	>	*/
5399	>	public static <K,V> ForkJoinTask<Void> forEachEntry
5400	>	(ConcurrentHashMapV8<K,V> map,
5401	>	Action<Map.Entry<K,V>> action) {
5402	>	if (action == null) throw new NullPointerException();
5403	>	return new ForEachEntryTask<K,V>(map, null, -1, action);
5404	>	}
5405	>
5406	>	/**
5407	>	* Returns a task that when invoked, perform the given action
5408	>	* for each non-null transformation of each entry.
5409	>	*
5410	>	* @param map the map
5411	>	* @param transformer a function returning the transformation
5412	>	* for an element, or null if there is no transformation (in
5413	>	* which case the action is not applied)
5414	>	* @param action the action
5415	>	*/
5416	>	public static <K,V,U> ForkJoinTask<Void> forEachEntry
5417	>	(ConcurrentHashMapV8<K,V> map,
5418	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
5419	>	Action<U> action) {
5420	>	if (transformer == null || action == null)
5421	>	throw new NullPointerException();
5422	>	return new ForEachTransformedEntryTask<K,V,U>
5423	>	(map, null, -1, transformer, action);
5424	>	}
5425	>
5426	>	/**
5427	>	* Returns a task that when invoked, returns a non-null result
5428	>	* from applying the given search function on each entry, or
5429	>	* null if none.  Upon success, further element processing is
5430	>	* suppressed and the results of any other parallel
5431	>	* invocations of the search function are ignored.
5432	>	*
5433	>	* @param map the map
5434	>	* @param searchFunction a function returning a non-null
5435	>	* result on success, else null
5436	>	* @return the task
5437	>	*/
5438	>	public static <K,V,U> ForkJoinTask<U> searchEntries
5439	>	(ConcurrentHashMapV8<K,V> map,
5440	>	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
5441	>	if (searchFunction == null) throw new NullPointerException();
5442	>	return new SearchEntriesTask<K,V,U>
5443	>	(map, null, -1, searchFunction,
5444	>	new AtomicReference<U>());
5445	>	}
5446	>
5447	>	/**
5448	>	* Returns a task that when invoked, returns the result of
5449	>	* accumulating all entries using the given reducer to combine
5450	>	* values, or null if none.
5451	>	*
5452	>	* @param map the map
5453	>	* @param reducer a commutative associative combining function
5454	>	* @return the task
5455	>	*/
5456	>	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
5457	>	(ConcurrentHashMapV8<K,V> map,
5458	>	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5459	>	if (reducer == null) throw new NullPointerException();
5460	>	return new ReduceEntriesTask<K,V>
5461	>	(map, null, -1, null, reducer);
5462	>	}
5463	>
5464	>	/**
5465	>	* Returns a task that when invoked, returns the result of
5466	>	* accumulating the given transformation of all entries using the
5467	>	* given reducer to combine values, or null if none.
5468	>	*
5469	>	* @param map the map
5470	>	* @param transformer a function returning the transformation
5471	>	* for an element, or null if there is no transformation (in
5472	>	* which case it is not combined).
5473	>	* @param reducer a commutative associative combining function
5474	>	* @return the task
5475	>	*/
5476	>	public static <K,V,U> ForkJoinTask<U> reduceEntries
5477	>	(ConcurrentHashMapV8<K,V> map,
5478	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
5479	>	BiFun<? super U, ? super U, ? extends U> reducer) {
5480	>	if (transformer == null || reducer == null)
5481	>	throw new NullPointerException();
5482	>	return new MapReduceEntriesTask<K,V,U>
5483	>	(map, null, -1, null, transformer, reducer);
5484	>	}
5485	>
5486	>	/**
5487	>	* Returns a task that when invoked, returns the result of
5488	>	* accumulating the given transformation of all entries using the
5489	>	* given reducer to combine values, and the given basis as an
5490	>	* identity value.
5491	>	*
5492	>	* @param map the map
5493	>	* @param transformer a function returning the transformation
5494	>	* for an element
5495	>	* @param basis the identity (initial default value) for the reduction
5496	>	* @param reducer a commutative associative combining function
5497	>	* @return the task
5498	>	*/
5499	>	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
5500	>	(ConcurrentHashMapV8<K,V> map,
5501	>	ObjectToDouble<Map.Entry<K,V>> transformer,
5502	>	double basis,
5503	>	DoubleByDoubleToDouble reducer) {
5504	>	if (transformer == null || reducer == null)
5505	>	throw new NullPointerException();
5506	>	return new MapReduceEntriesToDoubleTask<K,V>
5507	>	(map, null, -1, null, transformer, basis, reducer);
5508	>	}
5509	>
5510	>	/**
5511	>	* Returns a task that when invoked, returns the result of
5512	>	* accumulating the given transformation of all entries using the
5513	>	* given reducer to combine values, and the given basis as an
5514	>	* identity value.
5515	>	*
5516	>	* @param map the map
5517	>	* @param transformer a function returning the transformation
5518	>	* for an element
5519	>	* @param basis the identity (initial default value) for the reduction
5520	>	* @param reducer a commutative associative combining function
5521	>	* @return the task
5522	>	*/
5523	>	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
5524	>	(ConcurrentHashMapV8<K,V> map,
5525	>	ObjectToLong<Map.Entry<K,V>> transformer,
5526	>	long basis,
5527	>	LongByLongToLong reducer) {
5528	>	if (transformer == null || reducer == null)
5529	>	throw new NullPointerException();
5530	>	return new MapReduceEntriesToLongTask<K,V>
5531	>	(map, null, -1, null, transformer, basis, reducer);
5532	>	}
5533	>
5534	>	/**
5535	>	* Returns a task that when invoked, returns the result of
5536	>	* accumulating the given transformation of all entries using the
5537	>	* given reducer to combine values, and the given basis as an
5538	>	* identity value.
5539	>	*
5540	>	* @param map the map
5541	>	* @param transformer a function returning the transformation
5542	>	* for an element
5543	>	* @param basis the identity (initial default value) for the reduction
5544	>	* @param reducer a commutative associative combining function
5545	>	* @return the task
5546	>	*/
5547	>	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
5548	>	(ConcurrentHashMapV8<K,V> map,
5549	>	ObjectToInt<Map.Entry<K,V>> transformer,
5550	>	int basis,
5551	>	IntByIntToInt reducer) {
5552	>	if (transformer == null || reducer == null)
5553	>	throw new NullPointerException();
5554	>	return new MapReduceEntriesToIntTask<K,V>
5555	>	(map, null, -1, null, transformer, basis, reducer);
5556		}
3221	–	s.writeObject(null);
3222	–	s.writeObject(null);
3223	–	segments = null; // throw away
5557		}
5558
5559	<	/**
3227	<	* Reconstitutes the instance from a stream (that is, deserializes it).
3228	<	* @param s the stream
3229	<	*/
3230	<	@SuppressWarnings("unchecked")
3231	<	private void readObject(java.io.ObjectInputStream s)
3232	<	throws java.io.IOException, ClassNotFoundException {
3233	<	s.defaultReadObject();
3234	<	this.segments = null; // unneeded
3235	<	// initialize transient final field
3236	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
5559	>	// -------------------------------------------------------
5560
5561	<	// Create all nodes, then place in table once size is known
5562	<	long size = 0L;
5563	<	Node p = null;
5564	<	for (;;) {
5565	<	K k = (K) s.readObject();
5566	<	V v = (V) s.readObject();
5567	<	if (k != null && v != null) {
5568	<	int h = spread(k.hashCode());
5569	<	p = new Node(h, k, v, p);
5570	<	++size;
5561	>	/*
5562	>	* Task classes. Coded in a regular but ugly format/style to
5563	>	* simplify checks that each variant differs in the right way from
5564	>	* others. The null screenings exist because compilers cannot tell
5565	>	* that we've already null-checked task arguments, so we force
5566	>	* simplest hoisted bypass to help avoid convoluted traps.
5567	>	*/
5568	>
5569	>	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
5570	>	extends Traverser<K,V,Void> {
5571	>	final Action<K> action;
5572	>	ForEachKeyTask
5573	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5574	>	Action<K> action) {
5575	>	super(m, p, b);
5576	>	this.action = action;
5577	>	}
5578	>	@SuppressWarnings("unchecked") public final void compute() {
5579	>	final Action<K> action;
5580	>	if ((action = this.action) != null) {
5581	>	for (int b; (b = preSplit()) > 0;)
5582	>	new ForEachKeyTask<K,V>(map, this, b, action).fork();
5583	>	while (advance() != null)
5584	>	action.apply((K)nextKey);
5585	>	propagateCompletion();
5586	>	}
5587	>	}
5588	>	}
5589	>
5590	>	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
5591	>	extends Traverser<K,V,Void> {
5592	>	final Action<V> action;
5593	>	ForEachValueTask
5594	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5595	>	Action<V> action) {
5596	>	super(m, p, b);
5597	>	this.action = action;
5598	>	}
5599	>	@SuppressWarnings("unchecked") public final void compute() {
5600	>	final Action<V> action;
5601	>	if ((action = this.action) != null) {
5602	>	for (int b; (b = preSplit()) > 0;)
5603	>	new ForEachValueTask<K,V>(map, this, b, action).fork();
5604	>	V v;
5605	>	while ((v = advance()) != null)
5606	>	action.apply(v);
5607	>	propagateCompletion();
5608	>	}
5609	>	}
5610	>	}
5611	>
5612	>	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
5613	>	extends Traverser<K,V,Void> {
5614	>	final Action<Entry<K,V>> action;
5615	>	ForEachEntryTask
5616	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5617	>	Action<Entry<K,V>> action) {
5618	>	super(m, p, b);
5619	>	this.action = action;
5620	>	}
5621	>	@SuppressWarnings("unchecked") public final void compute() {
5622	>	final Action<Entry<K,V>> action;
5623	>	if ((action = this.action) != null) {
5624	>	for (int b; (b = preSplit()) > 0;)
5625	>	new ForEachEntryTask<K,V>(map, this, b, action).fork();
5626	>	V v;
5627	>	while ((v = advance()) != null)
5628	>	action.apply(entryFor((K)nextKey, v));
5629	>	propagateCompletion();
5630	>	}
5631	>	}
5632	>	}
5633	>
5634	>	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
5635	>	extends Traverser<K,V,Void> {
5636	>	final BiAction<K,V> action;
5637	>	ForEachMappingTask
5638	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5639	>	BiAction<K,V> action) {
5640	>	super(m, p, b);
5641	>	this.action = action;
5642	>	}
5643	>	@SuppressWarnings("unchecked") public final void compute() {
5644	>	final BiAction<K,V> action;
5645	>	if ((action = this.action) != null) {
5646	>	for (int b; (b = preSplit()) > 0;)
5647	>	new ForEachMappingTask<K,V>(map, this, b, action).fork();
5648	>	V v;
5649	>	while ((v = advance()) != null)
5650	>	action.apply((K)nextKey, v);
5651	>	propagateCompletion();
5652	>	}
5653	>	}
5654	>	}
5655	>
5656	>	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
5657	>	extends Traverser<K,V,Void> {
5658	>	final Fun<? super K, ? extends U> transformer;
5659	>	final Action<U> action;
5660	>	ForEachTransformedKeyTask
5661	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5662	>	Fun<? super K, ? extends U> transformer, Action<U> action) {
5663	>	super(m, p, b);
5664	>	this.transformer = transformer; this.action = action;
5665	>	}
5666	>	@SuppressWarnings("unchecked") public final void compute() {
5667	>	final Fun<? super K, ? extends U> transformer;
5668	>	final Action<U> action;
5669	>	if ((transformer = this.transformer) != null &&
5670	>	(action = this.action) != null) {
5671	>	for (int b; (b = preSplit()) > 0;)
5672	>	new ForEachTransformedKeyTask<K,V,U>
5673	>	(map, this, b, transformer, action).fork();
5674	>	U u;
5675	>	while (advance() != null) {
5676	>	if ((u = transformer.apply((K)nextKey)) != null)
5677	>	action.apply(u);
5678	>	}
5679	>	propagateCompletion();
5680	>	}
5681	>	}
5682	>	}
5683	>
5684	>	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
5685	>	extends Traverser<K,V,Void> {
5686	>	final Fun<? super V, ? extends U> transformer;
5687	>	final Action<U> action;
5688	>	ForEachTransformedValueTask
5689	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5690	>	Fun<? super V, ? extends U> transformer, Action<U> action) {
5691	>	super(m, p, b);
5692	>	this.transformer = transformer; this.action = action;
5693	>	}
5694	>	@SuppressWarnings("unchecked") public final void compute() {
5695	>	final Fun<? super V, ? extends U> transformer;
5696	>	final Action<U> action;
5697	>	if ((transformer = this.transformer) != null &&
5698	>	(action = this.action) != null) {
5699	>	for (int b; (b = preSplit()) > 0;)
5700	>	new ForEachTransformedValueTask<K,V,U>
5701	>	(map, this, b, transformer, action).fork();
5702	>	V v; U u;
5703	>	while ((v = advance()) != null) {
5704	>	if ((u = transformer.apply(v)) != null)
5705	>	action.apply(u);
5706	>	}
5707	>	propagateCompletion();
5708	>	}
5709	>	}
5710	>	}
5711	>
5712	>	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
5713	>	extends Traverser<K,V,Void> {
5714	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5715	>	final Action<U> action;
5716	>	ForEachTransformedEntryTask
5717	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5718	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<U> action) {
5719	>	super(m, p, b);
5720	>	this.transformer = transformer; this.action = action;
5721	>	}
5722	>	@SuppressWarnings("unchecked") public final void compute() {
5723	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5724	>	final Action<U> action;
5725	>	if ((transformer = this.transformer) != null &&
5726	>	(action = this.action) != null) {
5727	>	for (int b; (b = preSplit()) > 0;)
5728	>	new ForEachTransformedEntryTask<K,V,U>
5729	>	(map, this, b, transformer, action).fork();
5730	>	V v; U u;
5731	>	while ((v = advance()) != null) {
5732	>	if ((u = transformer.apply(entryFor((K)nextKey,
5733	>	v))) != null)
5734	>	action.apply(u);
5735	>	}
5736	>	propagateCompletion();
5737	>	}
5738	>	}
5739	>	}
5740	>
5741	>	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
5742	>	extends Traverser<K,V,Void> {
5743	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5744	>	final Action<U> action;
5745	>	ForEachTransformedMappingTask
5746	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5747	>	BiFun<? super K, ? super V, ? extends U> transformer,
5748	>	Action<U> action) {
5749	>	super(m, p, b);
5750	>	this.transformer = transformer; this.action = action;
5751	>	}
5752	>	@SuppressWarnings("unchecked") public final void compute() {
5753	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5754	>	final Action<U> action;
5755	>	if ((transformer = this.transformer) != null &&
5756	>	(action = this.action) != null) {
5757	>	for (int b; (b = preSplit()) > 0;)
5758	>	new ForEachTransformedMappingTask<K,V,U>
5759	>	(map, this, b, transformer, action).fork();
5760	>	V v; U u;
5761	>	while ((v = advance()) != null) {
5762	>	if ((u = transformer.apply((K)nextKey, v)) != null)
5763	>	action.apply(u);
5764	>	}
5765	>	propagateCompletion();
5766	>	}
5767	>	}
5768	>	}
5769	>
5770	>	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
5771	>	extends Traverser<K,V,U> {
5772	>	final Fun<? super K, ? extends U> searchFunction;
5773	>	final AtomicReference<U> result;
5774	>	SearchKeysTask
5775	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5776	>	Fun<? super K, ? extends U> searchFunction,
5777	>	AtomicReference<U> result) {
5778	>	super(m, p, b);
5779	>	this.searchFunction = searchFunction; this.result = result;
5780	>	}
5781	>	public final U getRawResult() { return result.get(); }
5782	>	@SuppressWarnings("unchecked") public final void compute() {
5783	>	final Fun<? super K, ? extends U> searchFunction;
5784	>	final AtomicReference<U> result;
5785	>	if ((searchFunction = this.searchFunction) != null &&
5786	>	(result = this.result) != null) {
5787	>	for (int b;;) {
5788	>	if (result.get() != null)
5789	>	return;
5790	>	if ((b = preSplit()) <= 0)
5791	>	break;
5792	>	new SearchKeysTask<K,V,U>
5793	>	(map, this, b, searchFunction, result).fork();
5794	>	}
5795	>	while (result.get() == null) {
5796	>	U u;
5797	>	if (advance() == null) {
5798	>	propagateCompletion();
5799	>	break;
5800	>	}
5801	>	if ((u = searchFunction.apply((K)nextKey)) != null) {
5802	>	if (result.compareAndSet(null, u))
5803	>	quietlyCompleteRoot();
5804	>	break;
5805	>	}
5806	>	}
5807		}
3249	–	else
3250	–	break;
5808		}
5809	<	if (p != null) {
5810	<	boolean init = false;
5811	<	int n;
5812	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
5813	<	n = MAXIMUM_CAPACITY;
5814	<	else {
5815	<	int sz = (int)size;
5816	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
5809	>	}
5810	>
5811	>	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
5812	>	extends Traverser<K,V,U> {
5813	>	final Fun<? super V, ? extends U> searchFunction;
5814	>	final AtomicReference<U> result;
5815	>	SearchValuesTask
5816	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5817	>	Fun<? super V, ? extends U> searchFunction,
5818	>	AtomicReference<U> result) {
5819	>	super(m, p, b);
5820	>	this.searchFunction = searchFunction; this.result = result;
5821	>	}
5822	>	public final U getRawResult() { return result.get(); }
5823	>	@SuppressWarnings("unchecked") public final void compute() {
5824	>	final Fun<? super V, ? extends U> searchFunction;
5825	>	final AtomicReference<U> result;
5826	>	if ((searchFunction = this.searchFunction) != null &&
5827	>	(result = this.result) != null) {
5828	>	for (int b;;) {
5829	>	if (result.get() != null)
5830	>	return;
5831	>	if ((b = preSplit()) <= 0)
5832	>	break;
5833	>	new SearchValuesTask<K,V,U>
5834	>	(map, this, b, searchFunction, result).fork();
5835	>	}
5836	>	while (result.get() == null) {
5837	>	V v; U u;
5838	>	if ((v = advance()) == null) {
5839	>	propagateCompletion();
5840	>	break;
5841	>	}
5842	>	if ((u = searchFunction.apply(v)) != null) {
5843	>	if (result.compareAndSet(null, u))
5844	>	quietlyCompleteRoot();
5845	>	break;
5846	>	}
5847	>	}
5848		}
5849	<	int sc = sizeCtl;
5850	<	boolean collide = false;
5851	<	if (n > sc &&
5852	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
5853	<	try {
5854	<	if (table == null) {
5855	<	init = true;
5856	<	Node[] tab = new Node[n];
5857	<	int mask = n - 1;
5858	<	while (p != null) {
5859	<	int j = p.hash & mask;
5860	<	Node next = p.next;
5861	<	Node q = p.next = tabAt(tab, j);
5862	<	setTabAt(tab, j, p);
5863	<	if (!collide && q != null && q.hash == p.hash)
5864	<	collide = true;
5865	<	p = next;
5866	<	}
5867	<	table = tab;
5868	<	counter.add(size);
5869	<	sc = n - (n >>> 2);
5849	>	}
5850	>	}
5851	>
5852	>	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5853	>	extends Traverser<K,V,U> {
5854	>	final Fun<Entry<K,V>, ? extends U> searchFunction;
5855	>	final AtomicReference<U> result;
5856	>	SearchEntriesTask
5857	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5858	>	Fun<Entry<K,V>, ? extends U> searchFunction,
5859	>	AtomicReference<U> result) {
5860	>	super(m, p, b);
5861	>	this.searchFunction = searchFunction; this.result = result;
5862	>	}
5863	>	public final U getRawResult() { return result.get(); }
5864	>	@SuppressWarnings("unchecked") public final void compute() {
5865	>	final Fun<Entry<K,V>, ? extends U> searchFunction;
5866	>	final AtomicReference<U> result;
5867	>	if ((searchFunction = this.searchFunction) != null &&
5868	>	(result = this.result) != null) {
5869	>	for (int b;;) {
5870	>	if (result.get() != null)
5871	>	return;
5872	>	if ((b = preSplit()) <= 0)
5873	>	break;
5874	>	new SearchEntriesTask<K,V,U>
5875	>	(map, this, b, searchFunction, result).fork();
5876	>	}
5877	>	while (result.get() == null) {
5878	>	V v; U u;
5879	>	if ((v = advance()) == null) {
5880	>	propagateCompletion();
5881	>	break;
5882	>	}
5883	>	if ((u = searchFunction.apply(entryFor((K)nextKey,
5884	>	v))) != null) {
5885	>	if (result.compareAndSet(null, u))
5886	>	quietlyCompleteRoot();
5887	>	return;
5888		}
3283	–	} finally {
3284	–	sizeCtl = sc;
5889		}
5890	<	if (collide) { // rescan and convert to TreeBins
5891	<	Node[] tab = table;
5892	<	for (int i = 0; i < tab.length; ++i) {
5893	<	int c = 0;
5894	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
5895	<	if (++c > TREE_THRESHOLD &&
5896	<	(e.key instanceof Comparable)) {
5897	<	replaceWithTreeBin(tab, i, e.key);
5898	<	break;
5899	<	}
5900	<	}
5890	>	}
5891	>	}
5892	>	}
5893	>
5894	>	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5895	>	extends Traverser<K,V,U> {
5896	>	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5897	>	final AtomicReference<U> result;
5898	>	SearchMappingsTask
5899	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5900	>	BiFun<? super K, ? super V, ? extends U> searchFunction,
5901	>	AtomicReference<U> result) {
5902	>	super(m, p, b);
5903	>	this.searchFunction = searchFunction; this.result = result;
5904	>	}
5905	>	public final U getRawResult() { return result.get(); }
5906	>	@SuppressWarnings("unchecked") public final void compute() {
5907	>	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5908	>	final AtomicReference<U> result;
5909	>	if ((searchFunction = this.searchFunction) != null &&
5910	>	(result = this.result) != null) {
5911	>	for (int b;;) {
5912	>	if (result.get() != null)
5913	>	return;
5914	>	if ((b = preSplit()) <= 0)
5915	>	break;
5916	>	new SearchMappingsTask<K,V,U>
5917	>	(map, this, b, searchFunction, result).fork();
5918	>	}
5919	>	while (result.get() == null) {
5920	>	V v; U u;
5921	>	if ((v = advance()) == null) {
5922	>	propagateCompletion();
5923	>	break;
5924	>	}
5925	>	if ((u = searchFunction.apply((K)nextKey, v)) != null) {
5926	>	if (result.compareAndSet(null, u))
5927	>	quietlyCompleteRoot();
5928	>	break;
5929		}
5930		}
5931		}
5932	<	if (!init) { // Can only happen if unsafely published.
5933	<	while (p != null) {
5934	<	internalPut(p.key, p.val);
5935	<	p = p.next;
5932	>	}
5933	>	}
5934	>
5935	>	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5936	>	extends Traverser<K,V,K> {
5937	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5938	>	K result;
5939	>	ReduceKeysTask<K,V> rights, nextRight;
5940	>	ReduceKeysTask
5941	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5942	>	ReduceKeysTask<K,V> nextRight,
5943	>	BiFun<? super K, ? super K, ? extends K> reducer) {
5944	>	super(m, p, b); this.nextRight = nextRight;
5945	>	this.reducer = reducer;
5946	>	}
5947	>	public final K getRawResult() { return result; }
5948	>	@SuppressWarnings("unchecked") public final void compute() {
5949	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5950	>	if ((reducer = this.reducer) != null) {
5951	>	for (int b; (b = preSplit()) > 0;)
5952	>	(rights = new ReduceKeysTask<K,V>
5953	>	(map, this, b, rights, reducer)).fork();
5954	>	K r = null;
5955	>	while (advance() != null) {
5956	>	K u = (K)nextKey;
5957	>	r = (r == null) ? u : reducer.apply(r, u);
5958	>	}
5959	>	result = r;
5960	>	CountedCompleter<?> c;
5961	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5962	>	ReduceKeysTask<K,V>
5963	>	t = (ReduceKeysTask<K,V>)c,
5964	>	s = t.rights;
5965	>	while (s != null) {
5966	>	K tr, sr;
5967	>	if ((sr = s.result) != null)
5968	>	t.result = (((tr = t.result) == null) ? sr :
5969	>	reducer.apply(tr, sr));
5970	>	s = t.rights = s.nextRight;
5971	>	}
5972	>	}
5973	>	}
5974	>	}
5975	>	}
5976	>
5977	>	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5978	>	extends Traverser<K,V,V> {
5979	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5980	>	V result;
5981	>	ReduceValuesTask<K,V> rights, nextRight;
5982	>	ReduceValuesTask
5983	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5984	>	ReduceValuesTask<K,V> nextRight,
5985	>	BiFun<? super V, ? super V, ? extends V> reducer) {
5986	>	super(m, p, b); this.nextRight = nextRight;
5987	>	this.reducer = reducer;
5988	>	}
5989	>	public final V getRawResult() { return result; }
5990	>	@SuppressWarnings("unchecked") public final void compute() {
5991	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5992	>	if ((reducer = this.reducer) != null) {
5993	>	for (int b; (b = preSplit()) > 0;)
5994	>	(rights = new ReduceValuesTask<K,V>
5995	>	(map, this, b, rights, reducer)).fork();
5996	>	V r = null;
5997	>	V v;
5998	>	while ((v = advance()) != null) {
5999	>	V u = v;
6000	>	r = (r == null) ? u : reducer.apply(r, u);
6001	>	}
6002	>	result = r;
6003	>	CountedCompleter<?> c;
6004	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6005	>	ReduceValuesTask<K,V>
6006	>	t = (ReduceValuesTask<K,V>)c,
6007	>	s = t.rights;
6008	>	while (s != null) {
6009	>	V tr, sr;
6010	>	if ((sr = s.result) != null)
6011	>	t.result = (((tr = t.result) == null) ? sr :
6012	>	reducer.apply(tr, sr));
6013	>	s = t.rights = s.nextRight;
6014	>	}
6015	>	}
6016	>	}
6017	>	}
6018	>	}
6019	>
6020	>	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
6021	>	extends Traverser<K,V,Map.Entry<K,V>> {
6022	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
6023	>	Map.Entry<K,V> result;
6024	>	ReduceEntriesTask<K,V> rights, nextRight;
6025	>	ReduceEntriesTask
6026	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6027	>	ReduceEntriesTask<K,V> nextRight,
6028	>	BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
6029	>	super(m, p, b); this.nextRight = nextRight;
6030	>	this.reducer = reducer;
6031	>	}
6032	>	public final Map.Entry<K,V> getRawResult() { return result; }
6033	>	@SuppressWarnings("unchecked") public final void compute() {
6034	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
6035	>	if ((reducer = this.reducer) != null) {
6036	>	for (int b; (b = preSplit()) > 0;)
6037	>	(rights = new ReduceEntriesTask<K,V>
6038	>	(map, this, b, rights, reducer)).fork();
6039	>	Map.Entry<K,V> r = null;
6040	>	V v;
6041	>	while ((v = advance()) != null) {
6042	>	Map.Entry<K,V> u = entryFor((K)nextKey, v);
6043	>	r = (r == null) ? u : reducer.apply(r, u);
6044	>	}
6045	>	result = r;
6046	>	CountedCompleter<?> c;
6047	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6048	>	ReduceEntriesTask<K,V>
6049	>	t = (ReduceEntriesTask<K,V>)c,
6050	>	s = t.rights;
6051	>	while (s != null) {
6052	>	Map.Entry<K,V> tr, sr;
6053	>	if ((sr = s.result) != null)
6054	>	t.result = (((tr = t.result) == null) ? sr :
6055	>	reducer.apply(tr, sr));
6056	>	s = t.rights = s.nextRight;
6057	>	}
6058	>	}
6059	>	}
6060	>	}
6061	>	}
6062	>
6063	>	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
6064	>	extends Traverser<K,V,U> {
6065	>	final Fun<? super K, ? extends U> transformer;
6066	>	final BiFun<? super U, ? super U, ? extends U> reducer;
6067	>	U result;
6068	>	MapReduceKeysTask<K,V,U> rights, nextRight;
6069	>	MapReduceKeysTask
6070	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6071	>	MapReduceKeysTask<K,V,U> nextRight,
6072	>	Fun<? super K, ? extends U> transformer,
6073	>	BiFun<? super U, ? super U, ? extends U> reducer) {
6074	>	super(m, p, b); this.nextRight = nextRight;
6075	>	this.transformer = transformer;
6076	>	this.reducer = reducer;
6077	>	}
6078	>	public final U getRawResult() { return result; }
6079	>	@SuppressWarnings("unchecked") public final void compute() {
6080	>	final Fun<? super K, ? extends U> transformer;
6081	>	final BiFun<? super U, ? super U, ? extends U> reducer;
6082	>	if ((transformer = this.transformer) != null &&
6083	>	(reducer = this.reducer) != null) {
6084	>	for (int b; (b = preSplit()) > 0;)
6085	>	(rights = new MapReduceKeysTask<K,V,U>
6086	>	(map, this, b, rights, transformer, reducer)).fork();
6087	>	U r = null, u;
6088	>	while (advance() != null) {
6089	>	if ((u = transformer.apply((K)nextKey)) != null)
6090	>	r = (r == null) ? u : reducer.apply(r, u);
6091	>	}
6092	>	result = r;
6093	>	CountedCompleter<?> c;
6094	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6095	>	MapReduceKeysTask<K,V,U>
6096	>	t = (MapReduceKeysTask<K,V,U>)c,
6097	>	s = t.rights;
6098	>	while (s != null) {
6099	>	U tr, sr;
6100	>	if ((sr = s.result) != null)
6101	>	t.result = (((tr = t.result) == null) ? sr :
6102	>	reducer.apply(tr, sr));
6103	>	s = t.rights = s.nextRight;
6104	>	}
6105	>	}
6106	>	}
6107	>	}
6108	>	}
6109	>
6110	>	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
6111	>	extends Traverser<K,V,U> {
6112	>	final Fun<? super V, ? extends U> transformer;
6113	>	final BiFun<? super U, ? super U, ? extends U> reducer;
6114	>	U result;
6115	>	MapReduceValuesTask<K,V,U> rights, nextRight;
6116	>	MapReduceValuesTask
6117	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6118	>	MapReduceValuesTask<K,V,U> nextRight,
6119	>	Fun<? super V, ? extends U> transformer,
6120	>	BiFun<? super U, ? super U, ? extends U> reducer) {
6121	>	super(m, p, b); this.nextRight = nextRight;
6122	>	this.transformer = transformer;
6123	>	this.reducer = reducer;
6124	>	}
6125	>	public final U getRawResult() { return result; }
6126	>	@SuppressWarnings("unchecked") public final void compute() {
6127	>	final Fun<? super V, ? extends U> transformer;
6128	>	final BiFun<? super U, ? super U, ? extends U> reducer;
6129	>	if ((transformer = this.transformer) != null &&
6130	>	(reducer = this.reducer) != null) {
6131	>	for (int b; (b = preSplit()) > 0;)
6132	>	(rights = new MapReduceValuesTask<K,V,U>
6133	>	(map, this, b, rights, transformer, reducer)).fork();
6134	>	U r = null, u;
6135	>	V v;
6136	>	while ((v = advance()) != null) {
6137	>	if ((u = transformer.apply(v)) != null)
6138	>	r = (r == null) ? u : reducer.apply(r, u);
6139	>	}
6140	>	result = r;
6141	>	CountedCompleter<?> c;
6142	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6143	>	MapReduceValuesTask<K,V,U>
6144	>	t = (MapReduceValuesTask<K,V,U>)c,
6145	>	s = t.rights;
6146	>	while (s != null) {
6147	>	U tr, sr;
6148	>	if ((sr = s.result) != null)
6149	>	t.result = (((tr = t.result) == null) ? sr :
6150	>	reducer.apply(tr, sr));
6151	>	s = t.rights = s.nextRight;
6152	>	}
6153	>	}
6154	>	}
6155	>	}
6156	>	}
6157	>
6158	>	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
6159	>	extends Traverser<K,V,U> {
6160	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
6161	>	final BiFun<? super U, ? super U, ? extends U> reducer;
6162	>	U result;
6163	>	MapReduceEntriesTask<K,V,U> rights, nextRight;
6164	>	MapReduceEntriesTask
6165	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6166	>	MapReduceEntriesTask<K,V,U> nextRight,
6167	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
6168	>	BiFun<? super U, ? super U, ? extends U> reducer) {
6169	>	super(m, p, b); this.nextRight = nextRight;
6170	>	this.transformer = transformer;
6171	>	this.reducer = reducer;
6172	>	}
6173	>	public final U getRawResult() { return result; }
6174	>	@SuppressWarnings("unchecked") public final void compute() {
6175	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
6176	>	final BiFun<? super U, ? super U, ? extends U> reducer;
6177	>	if ((transformer = this.transformer) != null &&
6178	>	(reducer = this.reducer) != null) {
6179	>	for (int b; (b = preSplit()) > 0;)
6180	>	(rights = new MapReduceEntriesTask<K,V,U>
6181	>	(map, this, b, rights, transformer, reducer)).fork();
6182	>	U r = null, u;
6183	>	V v;
6184	>	while ((v = advance()) != null) {
6185	>	if ((u = transformer.apply(entryFor((K)nextKey,
6186	>	v))) != null)
6187	>	r = (r == null) ? u : reducer.apply(r, u);
6188	>	}
6189	>	result = r;
6190	>	CountedCompleter<?> c;
6191	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6192	>	MapReduceEntriesTask<K,V,U>
6193	>	t = (MapReduceEntriesTask<K,V,U>)c,
6194	>	s = t.rights;
6195	>	while (s != null) {
6196	>	U tr, sr;
6197	>	if ((sr = s.result) != null)
6198	>	t.result = (((tr = t.result) == null) ? sr :
6199	>	reducer.apply(tr, sr));
6200	>	s = t.rights = s.nextRight;
6201	>	}
6202	>	}
6203	>	}
6204	>	}
6205	>	}
6206	>
6207	>	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
6208	>	extends Traverser<K,V,U> {
6209	>	final BiFun<? super K, ? super V, ? extends U> transformer;
6210	>	final BiFun<? super U, ? super U, ? extends U> reducer;
6211	>	U result;
6212	>	MapReduceMappingsTask<K,V,U> rights, nextRight;
6213	>	MapReduceMappingsTask
6214	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6215	>	MapReduceMappingsTask<K,V,U> nextRight,
6216	>	BiFun<? super K, ? super V, ? extends U> transformer,
6217	>	BiFun<? super U, ? super U, ? extends U> reducer) {
6218	>	super(m, p, b); this.nextRight = nextRight;
6219	>	this.transformer = transformer;
6220	>	this.reducer = reducer;
6221	>	}
6222	>	public final U getRawResult() { return result; }
6223	>	@SuppressWarnings("unchecked") public final void compute() {
6224	>	final BiFun<? super K, ? super V, ? extends U> transformer;
6225	>	final BiFun<? super U, ? super U, ? extends U> reducer;
6226	>	if ((transformer = this.transformer) != null &&
6227	>	(reducer = this.reducer) != null) {
6228	>	for (int b; (b = preSplit()) > 0;)
6229	>	(rights = new MapReduceMappingsTask<K,V,U>
6230	>	(map, this, b, rights, transformer, reducer)).fork();
6231	>	U r = null, u;
6232	>	V v;
6233	>	while ((v = advance()) != null) {
6234	>	if ((u = transformer.apply((K)nextKey, v)) != null)
6235	>	r = (r == null) ? u : reducer.apply(r, u);
6236	>	}
6237	>	result = r;
6238	>	CountedCompleter<?> c;
6239	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6240	>	MapReduceMappingsTask<K,V,U>
6241	>	t = (MapReduceMappingsTask<K,V,U>)c,
6242	>	s = t.rights;
6243	>	while (s != null) {
6244	>	U tr, sr;
6245	>	if ((sr = s.result) != null)
6246	>	t.result = (((tr = t.result) == null) ? sr :
6247	>	reducer.apply(tr, sr));
6248	>	s = t.rights = s.nextRight;
6249	>	}
6250	>	}
6251	>	}
6252	>	}
6253	>	}
6254	>
6255	>	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
6256	>	extends Traverser<K,V,Double> {
6257	>	final ObjectToDouble<? super K> transformer;
6258	>	final DoubleByDoubleToDouble reducer;
6259	>	final double basis;
6260	>	double result;
6261	>	MapReduceKeysToDoubleTask<K,V> rights, nextRight;
6262	>	MapReduceKeysToDoubleTask
6263	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6264	>	MapReduceKeysToDoubleTask<K,V> nextRight,
6265	>	ObjectToDouble<? super K> transformer,
6266	>	double basis,
6267	>	DoubleByDoubleToDouble reducer) {
6268	>	super(m, p, b); this.nextRight = nextRight;
6269	>	this.transformer = transformer;
6270	>	this.basis = basis; this.reducer = reducer;
6271	>	}
6272	>	public final Double getRawResult() { return result; }
6273	>	@SuppressWarnings("unchecked") public final void compute() {
6274	>	final ObjectToDouble<? super K> transformer;
6275	>	final DoubleByDoubleToDouble reducer;
6276	>	if ((transformer = this.transformer) != null &&
6277	>	(reducer = this.reducer) != null) {
6278	>	double r = this.basis;
6279	>	for (int b; (b = preSplit()) > 0;)
6280	>	(rights = new MapReduceKeysToDoubleTask<K,V>
6281	>	(map, this, b, rights, transformer, r, reducer)).fork();
6282	>	while (advance() != null)
6283	>	r = reducer.apply(r, transformer.apply((K)nextKey));
6284	>	result = r;
6285	>	CountedCompleter<?> c;
6286	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6287	>	MapReduceKeysToDoubleTask<K,V>
6288	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
6289	>	s = t.rights;
6290	>	while (s != null) {
6291	>	t.result = reducer.apply(t.result, s.result);
6292	>	s = t.rights = s.nextRight;
6293	>	}
6294	>	}
6295	>	}
6296	>	}
6297	>	}
6298	>
6299	>	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
6300	>	extends Traverser<K,V,Double> {
6301	>	final ObjectToDouble<? super V> transformer;
6302	>	final DoubleByDoubleToDouble reducer;
6303	>	final double basis;
6304	>	double result;
6305	>	MapReduceValuesToDoubleTask<K,V> rights, nextRight;
6306	>	MapReduceValuesToDoubleTask
6307	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6308	>	MapReduceValuesToDoubleTask<K,V> nextRight,
6309	>	ObjectToDouble<? super V> transformer,
6310	>	double basis,
6311	>	DoubleByDoubleToDouble reducer) {
6312	>	super(m, p, b); this.nextRight = nextRight;
6313	>	this.transformer = transformer;
6314	>	this.basis = basis; this.reducer = reducer;
6315	>	}
6316	>	public final Double getRawResult() { return result; }
6317	>	@SuppressWarnings("unchecked") public final void compute() {
6318	>	final ObjectToDouble<? super V> transformer;
6319	>	final DoubleByDoubleToDouble reducer;
6320	>	if ((transformer = this.transformer) != null &&
6321	>	(reducer = this.reducer) != null) {
6322	>	double r = this.basis;
6323	>	for (int b; (b = preSplit()) > 0;)
6324	>	(rights = new MapReduceValuesToDoubleTask<K,V>
6325	>	(map, this, b, rights, transformer, r, reducer)).fork();
6326	>	V v;
6327	>	while ((v = advance()) != null)
6328	>	r = reducer.apply(r, transformer.apply(v));
6329	>	result = r;
6330	>	CountedCompleter<?> c;
6331	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6332	>	MapReduceValuesToDoubleTask<K,V>
6333	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
6334	>	s = t.rights;
6335	>	while (s != null) {
6336	>	t.result = reducer.apply(t.result, s.result);
6337	>	s = t.rights = s.nextRight;
6338	>	}
6339	>	}
6340	>	}
6341	>	}
6342	>	}
6343	>
6344	>	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
6345	>	extends Traverser<K,V,Double> {
6346	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
6347	>	final DoubleByDoubleToDouble reducer;
6348	>	final double basis;
6349	>	double result;
6350	>	MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
6351	>	MapReduceEntriesToDoubleTask
6352	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6353	>	MapReduceEntriesToDoubleTask<K,V> nextRight,
6354	>	ObjectToDouble<Map.Entry<K,V>> transformer,
6355	>	double basis,
6356	>	DoubleByDoubleToDouble reducer) {
6357	>	super(m, p, b); this.nextRight = nextRight;
6358	>	this.transformer = transformer;
6359	>	this.basis = basis; this.reducer = reducer;
6360	>	}
6361	>	public final Double getRawResult() { return result; }
6362	>	@SuppressWarnings("unchecked") public final void compute() {
6363	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
6364	>	final DoubleByDoubleToDouble reducer;
6365	>	if ((transformer = this.transformer) != null &&
6366	>	(reducer = this.reducer) != null) {
6367	>	double r = this.basis;
6368	>	for (int b; (b = preSplit()) > 0;)
6369	>	(rights = new MapReduceEntriesToDoubleTask<K,V>
6370	>	(map, this, b, rights, transformer, r, reducer)).fork();
6371	>	V v;
6372	>	while ((v = advance()) != null)
6373	>	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
6374	>	v)));
6375	>	result = r;
6376	>	CountedCompleter<?> c;
6377	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6378	>	MapReduceEntriesToDoubleTask<K,V>
6379	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
6380	>	s = t.rights;
6381	>	while (s != null) {
6382	>	t.result = reducer.apply(t.result, s.result);
6383	>	s = t.rights = s.nextRight;
6384	>	}
6385	>	}
6386	>	}
6387	>	}
6388	>	}
6389	>
6390	>	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
6391	>	extends Traverser<K,V,Double> {
6392	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
6393	>	final DoubleByDoubleToDouble reducer;
6394	>	final double basis;
6395	>	double result;
6396	>	MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
6397	>	MapReduceMappingsToDoubleTask
6398	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6399	>	MapReduceMappingsToDoubleTask<K,V> nextRight,
6400	>	ObjectByObjectToDouble<? super K, ? super V> transformer,
6401	>	double basis,
6402	>	DoubleByDoubleToDouble reducer) {
6403	>	super(m, p, b); this.nextRight = nextRight;
6404	>	this.transformer = transformer;
6405	>	this.basis = basis; this.reducer = reducer;
6406	>	}
6407	>	public final Double getRawResult() { return result; }
6408	>	@SuppressWarnings("unchecked") public final void compute() {
6409	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
6410	>	final DoubleByDoubleToDouble reducer;
6411	>	if ((transformer = this.transformer) != null &&
6412	>	(reducer = this.reducer) != null) {
6413	>	double r = this.basis;
6414	>	for (int b; (b = preSplit()) > 0;)
6415	>	(rights = new MapReduceMappingsToDoubleTask<K,V>
6416	>	(map, this, b, rights, transformer, r, reducer)).fork();
6417	>	V v;
6418	>	while ((v = advance()) != null)
6419	>	r = reducer.apply(r, transformer.apply((K)nextKey, v));
6420	>	result = r;
6421	>	CountedCompleter<?> c;
6422	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6423	>	MapReduceMappingsToDoubleTask<K,V>
6424	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
6425	>	s = t.rights;
6426	>	while (s != null) {
6427	>	t.result = reducer.apply(t.result, s.result);
6428	>	s = t.rights = s.nextRight;
6429	>	}
6430	>	}
6431	>	}
6432	>	}
6433	>	}
6434	>
6435	>	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
6436	>	extends Traverser<K,V,Long> {
6437	>	final ObjectToLong<? super K> transformer;
6438	>	final LongByLongToLong reducer;
6439	>	final long basis;
6440	>	long result;
6441	>	MapReduceKeysToLongTask<K,V> rights, nextRight;
6442	>	MapReduceKeysToLongTask
6443	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6444	>	MapReduceKeysToLongTask<K,V> nextRight,
6445	>	ObjectToLong<? super K> transformer,
6446	>	long basis,
6447	>	LongByLongToLong reducer) {
6448	>	super(m, p, b); this.nextRight = nextRight;
6449	>	this.transformer = transformer;
6450	>	this.basis = basis; this.reducer = reducer;
6451	>	}
6452	>	public final Long getRawResult() { return result; }
6453	>	@SuppressWarnings("unchecked") public final void compute() {
6454	>	final ObjectToLong<? super K> transformer;
6455	>	final LongByLongToLong reducer;
6456	>	if ((transformer = this.transformer) != null &&
6457	>	(reducer = this.reducer) != null) {
6458	>	long r = this.basis;
6459	>	for (int b; (b = preSplit()) > 0;)
6460	>	(rights = new MapReduceKeysToLongTask<K,V>
6461	>	(map, this, b, rights, transformer, r, reducer)).fork();
6462	>	while (advance() != null)
6463	>	r = reducer.apply(r, transformer.apply((K)nextKey));
6464	>	result = r;
6465	>	CountedCompleter<?> c;
6466	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6467	>	MapReduceKeysToLongTask<K,V>
6468	>	t = (MapReduceKeysToLongTask<K,V>)c,
6469	>	s = t.rights;
6470	>	while (s != null) {
6471	>	t.result = reducer.apply(t.result, s.result);
6472	>	s = t.rights = s.nextRight;
6473	>	}
6474	>	}
6475	>	}
6476	>	}
6477	>	}
6478	>
6479	>	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
6480	>	extends Traverser<K,V,Long> {
6481	>	final ObjectToLong<? super V> transformer;
6482	>	final LongByLongToLong reducer;
6483	>	final long basis;
6484	>	long result;
6485	>	MapReduceValuesToLongTask<K,V> rights, nextRight;
6486	>	MapReduceValuesToLongTask
6487	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6488	>	MapReduceValuesToLongTask<K,V> nextRight,
6489	>	ObjectToLong<? super V> transformer,
6490	>	long basis,
6491	>	LongByLongToLong reducer) {
6492	>	super(m, p, b); this.nextRight = nextRight;
6493	>	this.transformer = transformer;
6494	>	this.basis = basis; this.reducer = reducer;
6495	>	}
6496	>	public final Long getRawResult() { return result; }
6497	>	@SuppressWarnings("unchecked") public final void compute() {
6498	>	final ObjectToLong<? super V> transformer;
6499	>	final LongByLongToLong reducer;
6500	>	if ((transformer = this.transformer) != null &&
6501	>	(reducer = this.reducer) != null) {
6502	>	long r = this.basis;
6503	>	for (int b; (b = preSplit()) > 0;)
6504	>	(rights = new MapReduceValuesToLongTask<K,V>
6505	>	(map, this, b, rights, transformer, r, reducer)).fork();
6506	>	V v;
6507	>	while ((v = advance()) != null)
6508	>	r = reducer.apply(r, transformer.apply(v));
6509	>	result = r;
6510	>	CountedCompleter<?> c;
6511	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6512	>	MapReduceValuesToLongTask<K,V>
6513	>	t = (MapReduceValuesToLongTask<K,V>)c,
6514	>	s = t.rights;
6515	>	while (s != null) {
6516	>	t.result = reducer.apply(t.result, s.result);
6517	>	s = t.rights = s.nextRight;
6518	>	}
6519	>	}
6520	>	}
6521	>	}
6522	>	}
6523	>
6524	>	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
6525	>	extends Traverser<K,V,Long> {
6526	>	final ObjectToLong<Map.Entry<K,V>> transformer;
6527	>	final LongByLongToLong reducer;
6528	>	final long basis;
6529	>	long result;
6530	>	MapReduceEntriesToLongTask<K,V> rights, nextRight;
6531	>	MapReduceEntriesToLongTask
6532	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6533	>	MapReduceEntriesToLongTask<K,V> nextRight,
6534	>	ObjectToLong<Map.Entry<K,V>> transformer,
6535	>	long basis,
6536	>	LongByLongToLong reducer) {
6537	>	super(m, p, b); this.nextRight = nextRight;
6538	>	this.transformer = transformer;
6539	>	this.basis = basis; this.reducer = reducer;
6540	>	}
6541	>	public final Long getRawResult() { return result; }
6542	>	@SuppressWarnings("unchecked") public final void compute() {
6543	>	final ObjectToLong<Map.Entry<K,V>> transformer;
6544	>	final LongByLongToLong reducer;
6545	>	if ((transformer = this.transformer) != null &&
6546	>	(reducer = this.reducer) != null) {
6547	>	long r = this.basis;
6548	>	for (int b; (b = preSplit()) > 0;)
6549	>	(rights = new MapReduceEntriesToLongTask<K,V>
6550	>	(map, this, b, rights, transformer, r, reducer)).fork();
6551	>	V v;
6552	>	while ((v = advance()) != null)
6553	>	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
6554	>	v)));
6555	>	result = r;
6556	>	CountedCompleter<?> c;
6557	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6558	>	MapReduceEntriesToLongTask<K,V>
6559	>	t = (MapReduceEntriesToLongTask<K,V>)c,
6560	>	s = t.rights;
6561	>	while (s != null) {
6562	>	t.result = reducer.apply(t.result, s.result);
6563	>	s = t.rights = s.nextRight;
6564	>	}
6565	>	}
6566	>	}
6567	>	}
6568	>	}
6569	>
6570	>	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
6571	>	extends Traverser<K,V,Long> {
6572	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
6573	>	final LongByLongToLong reducer;
6574	>	final long basis;
6575	>	long result;
6576	>	MapReduceMappingsToLongTask<K,V> rights, nextRight;
6577	>	MapReduceMappingsToLongTask
6578	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6579	>	MapReduceMappingsToLongTask<K,V> nextRight,
6580	>	ObjectByObjectToLong<? super K, ? super V> transformer,
6581	>	long basis,
6582	>	LongByLongToLong reducer) {
6583	>	super(m, p, b); this.nextRight = nextRight;
6584	>	this.transformer = transformer;
6585	>	this.basis = basis; this.reducer = reducer;
6586	>	}
6587	>	public final Long getRawResult() { return result; }
6588	>	@SuppressWarnings("unchecked") public final void compute() {
6589	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
6590	>	final LongByLongToLong reducer;
6591	>	if ((transformer = this.transformer) != null &&
6592	>	(reducer = this.reducer) != null) {
6593	>	long r = this.basis;
6594	>	for (int b; (b = preSplit()) > 0;)
6595	>	(rights = new MapReduceMappingsToLongTask<K,V>
6596	>	(map, this, b, rights, transformer, r, reducer)).fork();
6597	>	V v;
6598	>	while ((v = advance()) != null)
6599	>	r = reducer.apply(r, transformer.apply((K)nextKey, v));
6600	>	result = r;
6601	>	CountedCompleter<?> c;
6602	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6603	>	MapReduceMappingsToLongTask<K,V>
6604	>	t = (MapReduceMappingsToLongTask<K,V>)c,
6605	>	s = t.rights;
6606	>	while (s != null) {
6607	>	t.result = reducer.apply(t.result, s.result);
6608	>	s = t.rights = s.nextRight;
6609	>	}
6610	>	}
6611	>	}
6612	>	}
6613	>	}
6614	>
6615	>	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
6616	>	extends Traverser<K,V,Integer> {
6617	>	final ObjectToInt<? super K> transformer;
6618	>	final IntByIntToInt reducer;
6619	>	final int basis;
6620	>	int result;
6621	>	MapReduceKeysToIntTask<K,V> rights, nextRight;
6622	>	MapReduceKeysToIntTask
6623	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6624	>	MapReduceKeysToIntTask<K,V> nextRight,
6625	>	ObjectToInt<? super K> transformer,
6626	>	int basis,
6627	>	IntByIntToInt reducer) {
6628	>	super(m, p, b); this.nextRight = nextRight;
6629	>	this.transformer = transformer;
6630	>	this.basis = basis; this.reducer = reducer;
6631	>	}
6632	>	public final Integer getRawResult() { return result; }
6633	>	@SuppressWarnings("unchecked") public final void compute() {
6634	>	final ObjectToInt<? super K> transformer;
6635	>	final IntByIntToInt reducer;
6636	>	if ((transformer = this.transformer) != null &&
6637	>	(reducer = this.reducer) != null) {
6638	>	int r = this.basis;
6639	>	for (int b; (b = preSplit()) > 0;)
6640	>	(rights = new MapReduceKeysToIntTask<K,V>
6641	>	(map, this, b, rights, transformer, r, reducer)).fork();
6642	>	while (advance() != null)
6643	>	r = reducer.apply(r, transformer.apply((K)nextKey));
6644	>	result = r;
6645	>	CountedCompleter<?> c;
6646	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6647	>	MapReduceKeysToIntTask<K,V>
6648	>	t = (MapReduceKeysToIntTask<K,V>)c,
6649	>	s = t.rights;
6650	>	while (s != null) {
6651	>	t.result = reducer.apply(t.result, s.result);
6652	>	s = t.rights = s.nextRight;
6653	>	}
6654	>	}
6655	>	}
6656	>	}
6657	>	}
6658	>
6659	>	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
6660	>	extends Traverser<K,V,Integer> {
6661	>	final ObjectToInt<? super V> transformer;
6662	>	final IntByIntToInt reducer;
6663	>	final int basis;
6664	>	int result;
6665	>	MapReduceValuesToIntTask<K,V> rights, nextRight;
6666	>	MapReduceValuesToIntTask
6667	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6668	>	MapReduceValuesToIntTask<K,V> nextRight,
6669	>	ObjectToInt<? super V> transformer,
6670	>	int basis,
6671	>	IntByIntToInt reducer) {
6672	>	super(m, p, b); this.nextRight = nextRight;
6673	>	this.transformer = transformer;
6674	>	this.basis = basis; this.reducer = reducer;
6675	>	}
6676	>	public final Integer getRawResult() { return result; }
6677	>	@SuppressWarnings("unchecked") public final void compute() {
6678	>	final ObjectToInt<? super V> transformer;
6679	>	final IntByIntToInt reducer;
6680	>	if ((transformer = this.transformer) != null &&
6681	>	(reducer = this.reducer) != null) {
6682	>	int r = this.basis;
6683	>	for (int b; (b = preSplit()) > 0;)
6684	>	(rights = new MapReduceValuesToIntTask<K,V>
6685	>	(map, this, b, rights, transformer, r, reducer)).fork();
6686	>	V v;
6687	>	while ((v = advance()) != null)
6688	>	r = reducer.apply(r, transformer.apply(v));
6689	>	result = r;
6690	>	CountedCompleter<?> c;
6691	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6692	>	MapReduceValuesToIntTask<K,V>
6693	>	t = (MapReduceValuesToIntTask<K,V>)c,
6694	>	s = t.rights;
6695	>	while (s != null) {
6696	>	t.result = reducer.apply(t.result, s.result);
6697	>	s = t.rights = s.nextRight;
6698	>	}
6699	>	}
6700	>	}
6701	>	}
6702	>	}
6703	>
6704	>	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
6705	>	extends Traverser<K,V,Integer> {
6706	>	final ObjectToInt<Map.Entry<K,V>> transformer;
6707	>	final IntByIntToInt reducer;
6708	>	final int basis;
6709	>	int result;
6710	>	MapReduceEntriesToIntTask<K,V> rights, nextRight;
6711	>	MapReduceEntriesToIntTask
6712	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6713	>	MapReduceEntriesToIntTask<K,V> nextRight,
6714	>	ObjectToInt<Map.Entry<K,V>> transformer,
6715	>	int basis,
6716	>	IntByIntToInt reducer) {
6717	>	super(m, p, b); this.nextRight = nextRight;
6718	>	this.transformer = transformer;
6719	>	this.basis = basis; this.reducer = reducer;
6720	>	}
6721	>	public final Integer getRawResult() { return result; }
6722	>	@SuppressWarnings("unchecked") public final void compute() {
6723	>	final ObjectToInt<Map.Entry<K,V>> transformer;
6724	>	final IntByIntToInt reducer;
6725	>	if ((transformer = this.transformer) != null &&
6726	>	(reducer = this.reducer) != null) {
6727	>	int r = this.basis;
6728	>	for (int b; (b = preSplit()) > 0;)
6729	>	(rights = new MapReduceEntriesToIntTask<K,V>
6730	>	(map, this, b, rights, transformer, r, reducer)).fork();
6731	>	V v;
6732	>	while ((v = advance()) != null)
6733	>	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
6734	>	v)));
6735	>	result = r;
6736	>	CountedCompleter<?> c;
6737	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6738	>	MapReduceEntriesToIntTask<K,V>
6739	>	t = (MapReduceEntriesToIntTask<K,V>)c,
6740	>	s = t.rights;
6741	>	while (s != null) {
6742	>	t.result = reducer.apply(t.result, s.result);
6743	>	s = t.rights = s.nextRight;
6744	>	}
6745	>	}
6746	>	}
6747	>	}
6748	>	}
6749	>
6750	>	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
6751	>	extends Traverser<K,V,Integer> {
6752	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
6753	>	final IntByIntToInt reducer;
6754	>	final int basis;
6755	>	int result;
6756	>	MapReduceMappingsToIntTask<K,V> rights, nextRight;
6757	>	MapReduceMappingsToIntTask
6758	>	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6759	>	MapReduceMappingsToIntTask<K,V> nextRight,
6760	>	ObjectByObjectToInt<? super K, ? super V> transformer,
6761	>	int basis,
6762	>	IntByIntToInt reducer) {
6763	>	super(m, p, b); this.nextRight = nextRight;
6764	>	this.transformer = transformer;
6765	>	this.basis = basis; this.reducer = reducer;
6766	>	}
6767	>	public final Integer getRawResult() { return result; }
6768	>	@SuppressWarnings("unchecked") public final void compute() {
6769	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
6770	>	final IntByIntToInt reducer;
6771	>	if ((transformer = this.transformer) != null &&
6772	>	(reducer = this.reducer) != null) {
6773	>	int r = this.basis;
6774	>	for (int b; (b = preSplit()) > 0;)
6775	>	(rights = new MapReduceMappingsToIntTask<K,V>
6776	>	(map, this, b, rights, transformer, r, reducer)).fork();
6777	>	V v;
6778	>	while ((v = advance()) != null)
6779	>	r = reducer.apply(r, transformer.apply((K)nextKey, v));
6780	>	result = r;
6781	>	CountedCompleter<?> c;
6782	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6783	>	MapReduceMappingsToIntTask<K,V>
6784	>	t = (MapReduceMappingsToIntTask<K,V>)c,
6785	>	s = t.rights;
6786	>	while (s != null) {
6787	>	t.result = reducer.apply(t.result, s.result);
6788	>	s = t.rights = s.nextRight;
6789	>	}
6790		}
6791		}
6792		}
6793		}
6794
6795		// Unsafe mechanics
6796	<	private static final sun.misc.Unsafe UNSAFE;
6797	<	private static final long counterOffset;
6798	<	private static final long sizeCtlOffset;
6796	>	private static final sun.misc.Unsafe U;
6797	>	private static final long SIZECTL;
6798	>	private static final long TRANSFERINDEX;
6799	>	private static final long TRANSFERORIGIN;
6800	>	private static final long BASECOUNT;
6801	>	private static final long COUNTERBUSY;
6802	>	private static final long CELLVALUE;
6803		private static final long ABASE;
6804		private static final int ASHIFT;
6805
6806		static {
6807		int ss;
6808		try {
6809	<	UNSAFE = getUnsafe();
6809	>	U = getUnsafe();
6810		Class<?> k = ConcurrentHashMapV8.class;
6811	<	counterOffset = UNSAFE.objectFieldOffset
3322	<	(k.getDeclaredField("counter"));
3323	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6811	>	SIZECTL = U.objectFieldOffset
6812		(k.getDeclaredField("sizeCtl"));
6813	+	TRANSFERINDEX = U.objectFieldOffset
6814	+	(k.getDeclaredField("transferIndex"));
6815	+	TRANSFERORIGIN = U.objectFieldOffset
6816	+	(k.getDeclaredField("transferOrigin"));
6817	+	BASECOUNT = U.objectFieldOffset
6818	+	(k.getDeclaredField("baseCount"));
6819	+	COUNTERBUSY = U.objectFieldOffset
6820	+	(k.getDeclaredField("counterBusy"));
6821	+	Class<?> ck = CounterCell.class;
6822	+	CELLVALUE = U.objectFieldOffset
6823	+	(ck.getDeclaredField("value"));
6824		Class<?> sc = Node[].class;
6825	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6826	<	ss = UNSAFE.arrayIndexScale(sc);
6825	>	ABASE = U.arrayBaseOffset(sc);
6826	>	ss = U.arrayIndexScale(sc);
6827	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6828		} catch (Exception e) {
6829		throw new Error(e);
6830		}
6831		if ((ss & (ss-1)) != 0)
6832		throw new Error("data type scale not a power of two");
3333	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6833		}
6834
6835		/**
#	Line 3343 | Line 6842 | public class ConcurrentHashMapV8<K, V>
6842		private static sun.misc.Unsafe getUnsafe() {
6843		try {
6844		return sun.misc.Unsafe.getUnsafe();
6845	<	} catch (SecurityException se) {
6846	<	try {
6847	<	return java.security.AccessController.doPrivileged
6848	<	(new java.security
6849	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6850	<	public sun.misc.Unsafe run() throws Exception {
6851	<	java.lang.reflect.Field f = sun.misc
6852	<	.Unsafe.class.getDeclaredField("theUnsafe");
6853	<	f.setAccessible(true);
6854	<	return (sun.misc.Unsafe) f.get(null);
6855	<	}});
6856	<	} catch (java.security.PrivilegedActionException e) {
6857	<	throw new RuntimeException("Could not initialize intrinsics",
6858	<	e.getCause());
6859	<	}
6845	>	} catch (SecurityException tryReflectionInstead) {}
6846	>	try {
6847	>	return java.security.AccessController.doPrivileged
6848	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6849	>	public sun.misc.Unsafe run() throws Exception {
6850	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6851	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6852	>	f.setAccessible(true);
6853	>	Object x = f.get(null);
6854	>	if (k.isInstance(x))
6855	>	return k.cast(x);
6856	>	}
6857	>	throw new NoSuchFieldError("the Unsafe");
6858	>	}});
6859	>	} catch (java.security.PrivilegedActionException e) {
6860	>	throw new RuntimeException("Could not initialize intrinsics",
6861	>	e.getCause());
6862		}
6863		}
3363	–
6864		}

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