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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.22 by jsr166, Sat Sep 10 19:33:14 2011 UTC vs.
Revision 1.90 by dl, Tue Jan 22 20:17:55 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;
13		import java.util.Collection;
#	Line 19 | Line 21 | import java.util.Enumeration;
21		import java.util.ConcurrentModificationException;
22		import java.util.NoSuchElementException;
23		import java.util.concurrent.ConcurrentMap;
24	+	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
25	+	import java.util.concurrent.atomic.AtomicInteger;
26	+	import java.util.concurrent.atomic.AtomicReference;
27		import java.io.Serializable;
28
29		/**
#	Line 33 | 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. There may be
66	<	* much variance around this average as mappings are added and
67	<	* removed, but overall, this maintains a commonly accepted time/space
68	<	* tradeoff for hash tables.  However, resizing this or any other kind
69	<	* of hash table may be a relatively slow operation. When possible, it
70	<	* is a good idea to provide a size estimate as an optional {@code
65	>	* effect of maintaining roughly two bins per mapping (corresponding
66	>	* to a 0.75 load factor threshold for resizing). There may be much
67	>	* variance around this average as mappings are added and removed, but
68	>	* overall, this maintains a commonly accepted time/space tradeoff for
69	>	* hash tables.  However, resizing this or any other kind of hash
70	>	* table may be a relatively slow operation. When possible, it is a
71	>	* good idea to provide a size estimate as an optional {@code
72		* initialCapacity} constructor argument. An additional optional
73		* {@code loadFactor} constructor argument provides a further means of
74		* customizing initial table capacity by specifying the table density
#	Line 68 | Line 77 | import java.io.Serializable;
77		* versions of this class, constructors may optionally specify an
78		* expected {@code concurrencyLevel} as an additional hint for
79		* internal sizing.  Note that using many keys with exactly the same
80	<	* {@code hashCode{}} is a sure way to slow down performance of any
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		*
85	–	* <p><em>jsr166e note: This class is a candidate replacement for
86	–	* java.util.concurrent.ConcurrentHashMap.<em>
87	–	*
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		/**
220	<	* A function computing a mapping from the given key to a value,
221	<	* or {@code null} if there is no mapping. This is a place-holder
222	<	* for an upcoming JDK8 interface.
223	<	*/
224	<	public static interface MappingFunction<K, V> {
225	<	/**
226	<	* Returns a value for the given key, or null if there is no
227	<	* mapping. If this function throws an (unchecked) exception,
228	<	* the exception is rethrown to its caller, and no mapping is
229	<	* recorded.  Because this function is invoked within
230	<	* atomicity control, the computation should be short and
231	<	* simple. The most common usage is to construct a new object
232	<	* serving as an initial mapped value.
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
227	>	* functionality.
228	>	*
229	>	* <p>Sample usage: Here is one (of the several) ways to compute
230	>	* the sum of the values held in a map using the ForkJoin
231	>	* framework. As illustrated here, Spliterators are well suited to
232	>	* designs in which a task repeatedly splits off half its work
233	>	* into forked subtasks until small enough to process directly,
234	>	* and then joins these subtasks. Variants of this style can also
235	>	* be used in completion-based designs.
236	>	*
237	>	* <pre>
238	>	* {@code ConcurrentHashMapV8<String, Long> m = ...
239	>	* // split as if have 8 * parallelism, for load balance
240	>	* int n = m.size();
241	>	* int p = aForkJoinPool.getParallelism() * 8;
242	>	* int split = (n < p)? n : p;
243	>	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), split, null));
244	>	* // ...
245	>	* static class SumValues extends RecursiveTask<Long> {
246	>	*   final Spliterator<Long> s;
247	>	*   final int split;             // split while > 1
248	>	*   final SumValues nextJoin;    // records forked subtasks to join
249	>	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
250	>	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
251	>	*   }
252	>	*   public Long compute() {
253	>	*     long sum = 0;
254	>	*     SumValues subtasks = null; // fork subtasks
255	>	*     for (int s = split >>> 1; s > 0; s >>>= 1)
256	>	*       (subtasks = new SumValues(s.split(), s, subtasks)).fork();
257	>	*     while (s.hasNext())        // directly process remaining elements
258	>	*       sum += s.next();
259	>	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
260	>	*       sum += t.join();         // collect subtask results
261	>	*     return sum;
262	>	*   }
263	>	* }
264	>	* }</pre>
265	>	*/
266	>	public static interface Spliterator<T> extends Iterator<T> {
267	>	/**
268	>	* Returns a Spliterator covering approximately half of the
269	>	* elements, guaranteed not to overlap with those subsequently
270	>	* returned by this Spliterator.  After invoking this method,
271	>	* the current Spliterator will <em>not</em> produce any of
272	>	* the elements of the returned Spliterator, but the two
273	>	* Spliterators together will produce all of the elements that
274	>	* would have been produced by this Spliterator had this
275	>	* method not been called. The exact number of elements
276	>	* produced by the returned Spliterator is not guaranteed, and
277	>	* may be zero (i.e., with {@code hasNext()} reporting {@code
278	>	* false}) if this Spliterator cannot be further split.
279		*
280	<	* @param key the (non-null) key
281	<	* @return a value, or null if none
280	>	* @return a Spliterator covering approximately half of the
281	>	* elements
282	>	* @throws IllegalStateException if this Spliterator has
283	>	* already commenced traversing elements
284		*/
285	<	V map(K key);
285	>	Spliterator<T> split();
286		}
287
288		/*
#	Line 121 | Line 291 | public class ConcurrentHashMapV8<K, V>
291		* The primary design goal of this hash table is to maintain
292		* concurrent readability (typically method get(), but also
293		* iterators and related methods) while minimizing update
294	<	* contention.
295	<	*
296	<	* Each key-value mapping is held in a Node.  Because Node fields
297	<	* can contain special values, they are defined using plain Object
298	<	* types. Similarly in turn, all internal methods that use them
299	<	* work off Object types. And similarly, so do the internal
300	<	* methods of auxiliary iterator and view classes.  All public
301	<	* generic typed methods relay in/out of these internal methods,
302	<	* supplying null-checks and casts as needed.
294	>	* contention. Secondary goals are to keep space consumption about
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 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
310	<	* first insertion.  Each bin in the table contains a list of
311	<	* Nodes (most often, zero or one Node).  Table accesses require
312	<	* volatile/atomic reads, writes, and CASes.  Because there is no
313	<	* other way to arrange this without adding further indirections,
314	<	* we use intrinsics (sun.misc.Unsafe) operations.  The lists of
315	<	* nodes within bins are always accurately traversable under
316	<	* volatile reads, so long as lookups check hash code and
317	<	* non-nullness of value before checking key equality. (All valid
318	<	* hash codes are nonnegative. Negative values are reserved for
319	<	* special forwarding nodes; see below.)
310	>	* first insertion.  Each bin in the table normally contains a
311	>	* list of Nodes (most often, the list has only zero or one Node).
312	>	* Table accesses require volatile/atomic reads, writes, and
313	>	* CASes.  Because there is no other way to arrange this without
314	>	* adding further indirections, we use intrinsics
315	>	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
316	>	* are always accurately traversable under volatile reads, so long
317	>	* as lookups check hash code and non-nullness of value before
318	>	* checking key equality.
319	>	*
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 putIfAbsent) of the first node in an
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
329	<	* on average by far the most common case for put operations.
330	<	* Other update operations (insert, delete, and replace) require
331	<	* locks.  We do not want to waste the space required to associate
332	<	* a distinct lock object with each bin, so instead use the first
333	<	* node of a bin list itself as a lock, using plain "synchronized"
334	<	* locks. These save space and we can live with block-structured
335	<	* lock/unlock operations. Using the first node of a list as a
336	<	* lock does not by itself suffice though: When a node is locked,
337	<	* any update must first validate that it is still the first node,
338	<	* and retry if not. Because new nodes are always appended to
339	<	* lists, once a node is first in a bin, it remains first until
340	<	* deleted or the bin becomes invalidated.  However, operations
341	<	* that only conditionally update can and sometimes do inspect
342	<	* nodes until the point of update. This is a converse of sorts to
343	<	* the lazy locking technique described by Herlihy & Shavit.
329	>	* by far the most common case for put operations under most
330	>	* key/hash distributions.  Other update operations (insert,
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. 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
339	>	* validate that it is still the first node after locking it, and
340	>	* retry if not. Because new nodes are always appended to lists,
341	>	* once a node is first in a bin, it remains first until deleted
342	>	* or the bin becomes invalidated (upon resizing).  However,
343	>	* operations that only conditionally update may inspect nodes
344	>	* until the point of update. This is a converse of sorts to the
345	>	* lazy locking technique described by Herlihy & Shavit.
346		*
347	<	* The main disadvantage of this approach is that most update
347	>	* The main disadvantage of per-bin locks is that other update
348		* operations on other nodes in a bin list protected by the same
349		* lock can stall, for example when user equals() or mapping
350	<	* functions take a long time.  However, statistically, this is
351	<	* not a common enough problem to outweigh the time/space overhead
352	<	* of alternatives: Under random hash codes, the frequency of
170	<	* nodes in bins follows a Poisson distribution
350	>	* functions take a long time.  However, statistically, under
351	>	* random hash codes, this is not a common problem.  Ideally, the
352	>	* frequency of nodes in bins follows a Poisson distribution
353		* (http://en.wikipedia.org/wiki/Poisson_distribution) with a
354		* parameter of about 0.5 on average, given the resizing threshold
355		* of 0.75, although with a large variance because of resizing
356		* granularity. Ignoring variance, the expected occurrences of
357		* list size k are (exp(-0.5) * pow(0.5, k) / factorial(k)). The
358	<	* first few values are:
358	>	* first values are:
359		*
360	<	* 0:    0.607
361	<	* 1:    0.303
362	<	* 2:    0.076
363	<	* 3:    0.012
364	<	* more: 0.002
360	>	* 0:    0.60653066
361	>	* 1:    0.30326533
362	>	* 2:    0.07581633
363	>	* 3:    0.01263606
364	>	* 4:    0.00157952
365	>	* 5:    0.00015795
366	>	* 6:    0.00001316
367	>	* 7:    0.00000094
368	>	* 8:    0.00000006
369	>	* more: less than 1 in ten million
370		*
371		* Lock contention probability for two threads accessing distinct
372	<	* elements is roughly 1 / (8 * #elements).  Function "spread"
373	<	* performs hashCode randomization that improves the likelihood
374	<	* that these assumptions hold unless users define exactly the
375	<	* same value for too many hashCodes.
376	<	*
377	<	* The table is resized when occupancy exceeds a threshold.  Only
378	<	* a single thread performs the resize (using field "resizing", to
379	<	* arrange exclusion), but the table otherwise remains usable for
380	<	* reads and updates. Resizing proceeds by transferring bins, one
381	<	* by one, from the table to the next table.  Upon transfer, the
382	<	* old table bin contains only a special forwarding node (with
383	<	* negative hash field) that contains the next table as its
384	<	* key. On encountering a forwarding node, access and update
385	<	* operations restart, using the new table. To ensure concurrent
386	<	* readability of traversals, transfers must proceed from the last
387	<	* bin (table.length - 1) up towards the first.  Upon seeing a
388	<	* forwarding node, traversals (see class InternalIterator)
389	<	* arrange to move to the new table for the rest of the traversal
390	<	* without revisiting nodes.  This constrains bin transfers to a
391	<	* particular order, and so can block indefinitely waiting for the
392	<	* next lock, and other threads cannot help with the transfer.
393	<	* However, expected stalls are infrequent enough to not warrant
394	<	* the additional overhead of access and iteration schemes that
395	<	* could admit out-of-order or concurrent bin transfers.
396	<	*
397	<	* This traversal scheme also applies to partial traversals of
398	<	* ranges of bins (via an alternate InternalIterator constructor)
399	<	* to support partitioned aggregate operations (that are not
400	<	* otherwise implemented yet).  Also, read-only operations give up
401	<	* if ever forwarded to a null table, which provides support for
402	<	* shutdown-style clearing, which is also not currently
403	<	* implemented.
372	>	* elements is roughly 1 / (8 * #elements) under random hashes.
373	>	*
374	>	* Actual hash code distributions encountered in practice
375	>	* sometimes deviate significantly from uniform randomness.  This
376	>	* includes the case when N > (1<<30), so some keys MUST collide.
377	>	* Similarly for dumb or hostile usages in which multiple keys are
378	>	* designed to have identical hash codes. Also, although we guard
379	>	* against the worst effects of this (see method spread), sets of
380	>	* hashes may differ only in bits that do not impact their bin
381	>	* index for a given power-of-two mask.  So we use a secondary
382	>	* strategy that applies when the number of nodes in a bin exceeds
383	>	* a threshold, and at least one of the keys implements
384	>	* Comparable.  These TreeBins use a balanced tree to hold nodes
385	>	* (a specialized form of red-black trees), bounding search time
386	>	* to O(log N).  Each search step in a TreeBin is around twice as
387	>	* slow as in a regular list, but given that N cannot exceed
388	>	* (1<<64) (before running out of addresses) this bounds search
389	>	* steps, lock hold times, etc, to reasonable constants (roughly
390	>	* 100 nodes inspected per operation worst case) so long as keys
391	>	* are Comparable (which is very common -- String, Long, etc).
392	>	* TreeBin nodes (TreeNodes) also maintain the same "next"
393	>	* traversal pointers as regular nodes, so can be traversed in
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).  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 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
440	>	* currently implemented.
441		*
442		* Lazy table initialization minimizes footprint until first use,
443		* and also avoids resizings when the first operation is from a
444		* putAll, constructor with map argument, or deserialization.
445	<	* These cases attempt to override the targetCapacity used in
446	<	* growTable. These harmlessly fail to take effect in cases of
447	<	* races with other ongoing resizings. Uses of the threshold and
448	<	* targetCapacity during attempted initializations or resizings
449	<	* are racy but fall back on checks to preserve correctness.
450	<	*
451	<	* The element count is maintained using a LongAdder, which avoids
452	<	* contention on updates but can encounter cache thrashing if read
453	<	* too frequently during concurrent access. To avoid reading so
454	<	* often, resizing is normally attempted only upon adding to a bin
455	<	* already holding two or more nodes. Under uniform hash
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 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). But this
460	<	* approximation has high variance for small table sizes, so we
461	<	* check on any collision for sizes <= 64.  Further, to increase
237	<	* the probability that a resize occurs soon enough, we offset the
238	<	* threshold (see THRESHOLD_OFFSET) by the expected number of puts
239	<	* between checks.
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
465		* leave untouched but unused constructor arguments refering to
466	<	* concurrencyLevel. We also declare an unused "Segment" class
467	<	* that is instantiated in minimal form only when serializing.
466	>	* concurrencyLevel. We accept a loadFactor constructor argument,
467	>	* but apply it only to initial table capacity (which is the only
468	>	* time that we can guarantee to honor it.) We also declare an
469	>	* unused "Segment" class that is instantiated in minimal form
470	>	* only when serializing.
471		*/
472
473		/* ---------------- Constants -------------- */
#	Line 250 | Line 475 | public class ConcurrentHashMapV8<K, V>
475		/**
476		* The largest possible table capacity.  This value must be
477		* exactly 1<<30 to stay within Java array allocation and indexing
478	<	* bounds for power of two table sizes.
478	>	* bounds for power of two table sizes, and is further required
479	>	* because the top two bits of 32bit hash fields are used for
480	>	* control purposes.
481		*/
482		private static final int MAXIMUM_CAPACITY = 1 << 30;
483
#	Line 261 | Line 488 | public class ConcurrentHashMapV8<K, V>
488		private static final int DEFAULT_CAPACITY = 16;
489
490		/**
491	+	* The largest possible (non-power of two) array size.
492	+	* Needed by toArray and related methods.
493	+	*/
494	+	static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
495	+
496	+	/**
497	+	* The default concurrency level for this table. Unused but
498	+	* defined for compatibility with previous versions of this class.
499	+	*/
500	+	private static final int DEFAULT_CONCURRENCY_LEVEL = 16;
501	+
502	+	/**
503		* The load factor for this table. Overrides of this value in
504		* constructors affect only the initial table capacity.  The
505	<	* actual floating point value isn't normally used, because it is
506	<	* simpler to rely on the expression {@code n - (n >>> 2)} for the
507	<	* associated resizing threshold.
505	>	* actual floating point value isn't normally used -- it is
506	>	* simpler to use expressions such as {@code n - (n >>> 2)} for
507	>	* the associated resizing threshold.
508		*/
509		private static final float LOAD_FACTOR = 0.75f;
510
511		/**
512	<	* The count value to offset thresholds to compensate for checking
513	<	* for the need to resize only when inserting into bins with two
514	<	* or more elements. See above for explanation.
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 THRESHOLD_OFFSET = 8;
516	>	private static final int TREE_THRESHOLD = 8;
517
518		/**
519	<	* The default concurrency level for this table. Unused except as
520	<	* a sizing hint, but defined for compatibility with previous
521	<	* versions of this class.
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 DEFAULT_CONCURRENCY_LEVEL = 16;
525	>	private static final int MIN_TRANSFER_STRIDE = 16;
526
527	<	/* ---------------- Nodes -------------- */
527	>	/*
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 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	<	* Key-value entry. Note that this is never exported out as a
551	<	* user-visible Map.Entry. Nodes with a negative hash field are
552	<	* special, and do not contain user keys or values.  Otherwise,
292	<	* keys are never null, and null val fields indicate that a node
293	<	* is in the process of being deleted or created. For purposes of
294	<	* read-only, access, a key may be read before a val, but can only
295	<	* be used after checking val.  (For an update operation, when a
296	<	* lock is held on a node, order doesn't matter.)
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 Node {
555	<	final int hash;
300	<	final Object key;
301	<	volatile Object val;
302	<	volatile Node next;
303	<
304	<	Node(int hash, Object key, Object val, Node next) {
305	<	this.hash = hash;
306	<	this.key = key;
307	<	this.val = val;
308	<	this.next = next;
309	<	}
554	>	static final class CounterHashCode {
555	>	int code;
556		}
557
558		/**
559	<	* Sign bit of node hash value indicating to use table in node.key.
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	<	private static final int SIGN_BIT = 0x80000000;
572	>	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
573	>	new ThreadLocal<CounterHashCode>();
574
575		/* ---------------- Fields -------------- */
576
#	Line 320 | 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	<	/** The counter maintaining number of elements. */
584	<	private transient final LongAdder counter;
585	<	/** Nonzero when table is being initialized or resized. Updated via CAS. */
586	<	private transient volatile int resizing;
587	<	/** The next element count value upon which to resize the table. */
588	<	private transient int threshold;
589	<	/** The target capacity; volatile to cover initialization races. */
590	<	private transient volatile int targetCapacity;
583	>	/**
584	>	* The next table to use; non-null only while resizing.
585	>	*/
586	>	private transient volatile Node<V>[] nextTable;
587	>
588	>	/**
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 volatile long baseCount;
594	>
595	>	/**
596	>	* Table initialization and resizing control.  When negative, the
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 353 | 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	<	/* ----------------Table Initialization and Resizing -------------- */
662	>	/* ---------------- Nodes -------------- */
663
664		/**
665	<	* Returns a power of two table size for the given desired capacity.
666	<	* See Hackers Delight, sec 3.2
665	>	* Key-value entry. Note that this is never exported out as a
666	>	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
667	>	* field of MOVED are special, and do not contain user keys or
668	>	* values.  Otherwise, keys are never null, and null val fields
669	>	* indicate that a node is in the process of being deleted or
670	>	* created. For purposes of read-only access, a key may be read
671	>	* before a val, but can only be used after checking val to be
672	>	* non-null.
673		*/
674	<	private static final int tableSizeFor(int c) {
675	<	int n = c - 1;
676	<	n |= n >>> 1;
677	<	n |= n >>> 2;
678	<	n |= n >>> 4;
679	<	n |= n >>> 8;
680	<	n |= n >>> 16;
681	<	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
674	>	static class Node<V> {
675	>	final int hash;
676	>	final Object key;
677	>	volatile V val;
678	>	volatile Node<V> next;
679	>
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	>	}
686		}
687
688	+	/* ---------------- TreeBins -------------- */
689	+
690		/**
691	<	* If not already resizing, initializes or creates next table and
692	<	* transfers bins. Initial table size uses the capacity recorded
693	<	* in targetCapacity.  Rechecks occupancy after a transfer to see
694	<	* if another resize is already needed because resizings are
695	<	* lagging additions.
696	<	*
697	<	* @return current table
698	<	*/
699	<	private final Node[] growTable() {
700	<	if (resizing == 0 &&
701	<	UNSAFE.compareAndSwapInt(this, resizingOffset, 0, 1)) {
702	<	try {
397	<	for (;;) {
398	<	Node[] tab = table;
399	<	int n, c, m;
400	<	if (tab == null)
401	<	n = (c = targetCapacity) > 0 ? c : DEFAULT_CAPACITY;
402	<	else if ((m = tab.length) < MAXIMUM_CAPACITY &&
403	<	counter.sum() >= (long)threshold)
404	<	n = m << 1;
405	<	else
406	<	break;
407	<	threshold = n - (n >>> 2) - THRESHOLD_OFFSET;
408	<	Node[] nextTab = new Node[n];
409	<	if (tab != null)
410	<	transfer(tab, nextTab,
411	<	new Node(SIGN_BIT, nextTab, null, null));
412	<	table = nextTab;
413	<	if (tab == null)
414	<	break;
415	<	}
416	<	} finally {
417	<	resizing = 0;
418	<	}
691	>	* Nodes for use in TreeBins
692	>	*/
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, V val, Node<V> next, TreeNode<V> parent) {
701	>	super(hash, key, val, next);
702	>	this.parent = parent;
703		}
420	–	else if (table == null)
421	–	Thread.yield(); // lost initialization race; just spin
422	–	return table;
704		}
705
706		/**
707	<	* Reclassifies nodes in each bin to new table.  Because we are
708	<	* using power-of-two expansion, the elements from each bin must
428	<	* either stay at same index, or move with a power of two
429	<	* offset. We eliminate unnecessary node creation by catching
430	<	* cases where old nodes can be reused because their next fields
431	<	* won't change.  Statistically, only about one-sixth of them need
432	<	* cloning when a table doubles. The nodes they replace will be
433	<	* garbage collectable as soon as they are no longer referenced by
434	<	* any reader thread that may be in the midst of concurrently
435	<	* traversing table.
707	>	* A specialized form of red-black tree for use in bins
708	>	* whose size exceeds a threshold.
709		*
710	<	* Transfers are done from the bottom up to preserve iterator
711	<	* traversability. On each step, the old bin is locked,
712	<	* moved/copied, and then replaced with a forwarding node.
713	<	*/
714	<	private static final void transfer(Node[] tab, Node[] nextTab, Node fwd) {
715	<	int n = tab.length;
716	<	Node ignore = nextTab[n + n - 1]; // force bounds check
717	<	for (int i = n - 1; i >= 0; --i) {
718	<	for (Node e;;) {
719	<	if ((e = tabAt(tab, i)) != null) {
720	<	boolean validated = false;
721	<	synchronized (e) {
722	<	if (tabAt(tab, i) == e) {
723	<	validated = true;
724	<	Node lo = null, hi = null, lastRun = e;
725	<	int runBit = e.hash & n;
726	<	for (Node p = e.next; p != null; p = p.next) {
727	<	int b = p.hash & n;
728	<	if (b != runBit) {
729	<	runBit = b;
730	<	lastRun = p;
710	>	* TreeBins use a special form of comparison for search and
711	>	* related operations (which is the main reason we cannot use
712	>	* existing collections such as TreeMaps). TreeBins contain
713	>	* Comparable elements, but may contain others, as well as
714	>	* elements that are Comparable but not necessarily Comparable<T>
715	>	* for the same T, so we cannot invoke compareTo among them. To
716	>	* handle this, the tree is ordered primarily by hash value, then
717	>	* by getClass().getName() order, and then by Comparator order
718	>	* among elements of the same class.  On lookup at a node, if
719	>	* elements are not comparable or compare as 0, both left and
720	>	* right children may need to be searched in the case of tied hash
721	>	* values. (This corresponds to the full list search that would be
722	>	* necessary if all elements were non-Comparable and had tied
723	>	* hashes.)  The red-black balancing code is updated from
724	>	* pre-jdk-collections
725	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
726	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
727	>	* Algorithms" (CLR).
728	>	*
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 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
736	>	* locks. However, lookups use shared read-lock mechanics to allow
737	>	* multiple readers in the absence of writers.  Additionally,
738	>	* these lookups do not ever block: While the lock is not
739	>	* available, they proceed along the slow traversal path (via
740	>	* next-pointers) until the lock becomes available or the list is
741	>	* exhausted, whichever comes first. (These cases are not fast,
742	>	* but maximize aggregate expected throughput.)  The AQS mechanics
743	>	* for doing this are straightforward.  The lock state is held as
744	>	* AQS getState().  Read counts are negative; the write count (1)
745	>	* is positive.  There are no signalling preferences among readers
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<V> extends AbstractQueuedSynchronizer {
750	>	private static final long serialVersionUID = 2249069246763182397L;
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; }
756	>	public final boolean tryAcquire(int ignore) {
757	>	if (compareAndSetState(0, 1)) {
758	>	setExclusiveOwnerThread(Thread.currentThread());
759	>	return true;
760	>	}
761	>	return false;
762	>	}
763	>	public final boolean tryRelease(int ignore) {
764	>	setExclusiveOwnerThread(null);
765	>	setState(0);
766	>	return true;
767	>	}
768	>	public final int tryAcquireShared(int ignore) {
769	>	for (int c;;) {
770	>	if ((c = getState()) > 0)
771	>	return -1;
772	>	if (compareAndSetState(c, c -1))
773	>	return 1;
774	>	}
775	>	}
776	>	public final boolean tryReleaseShared(int ignore) {
777	>	int c;
778	>	do {} while (!compareAndSetState(c = getState(), c + 1));
779	>	return c == -1;
780	>	}
781	>
782	>	/** From CLR */
783	>	private void rotateLeft(TreeNode<V> p) {
784	>	if (p != null) {
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)
789	>	root = r;
790	>	else if (pp.left == p)
791	>	pp.left = r;
792	>	else
793	>	pp.right = r;
794	>	r.left = p;
795	>	p.parent = r;
796	>	}
797	>	}
798	>
799	>	/** From CLR */
800	>	private void rotateRight(TreeNode<V> p) {
801	>	if (p != null) {
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)
806	>	root = l;
807	>	else if (pp.right == p)
808	>	pp.right = l;
809	>	else
810	>	pp.left = l;
811	>	l.right = p;
812	>	p.parent = l;
813	>	}
814	>	}
815	>
816	>	/**
817	>	* Returns the TreeNode (or null if not found) for the given key
818	>	* starting at given root.
819	>	*/
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;
825	>	if ((ph = p.hash) == h) {
826	>	if ((pk = p.key) == k || k.equals(pk))
827	>	return p;
828	>	if (c != (pc = pk.getClass()) ||
829	>	!(k instanceof Comparable) ||
830	>	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
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	>	}
842	>	}
843	>	}
844	>	else
845	>	dir = (h < ph) ? -1 : 1;
846	>	p = (dir > 0) ? p.right : p.left;
847	>	}
848	>	return null;
849	>	}
850	>
851	>	/**
852	>	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
853	>	* read-lock to call getTreeNode, but during failure to get
854	>	* lock, searches along next links.
855	>	*/
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<V> e = first; e != null; e = e.next) {
860	>	if (c <= 0 && compareAndSetState(c, c - 1)) {
861	>	try {
862	>	r = getTreeNode(h, k, root);
863	>	} finally {
864	>	releaseShared(0);
865	>	}
866	>	break;
867	>	}
868	>	else if (e.hash == h && k.equals(e.key)) {
869	>	r = e;
870	>	break;
871	>	}
872	>	else
873	>	c = getState();
874	>	}
875	>	return r == null ? null : r.val;
876	>	}
877	>
878	>	/**
879	>	* Finds or adds a node.
880	>	* @return null if added
881	>	*/
882	>	@SuppressWarnings("unchecked") final TreeNode<V> putTreeNode
883	>	(int h, Object k, V v) {
884	>	Class<?> c = k.getClass();
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;
889	>	p = pp;
890	>	if ((ph = p.hash) == h) {
891	>	if ((pk = p.key) == k || k.equals(pk))
892	>	return p;
893	>	if (c != (pc = pk.getClass()) ||
894	>	!(k instanceof Comparable) ||
895	>	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
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;
907	>	if (s != null && (r = getTreeNode(h, k, s)) != null)
908	>	return r;
909	>	}
910	>	}
911	>	else
912	>	dir = (h < ph) ? -1 : 1;
913	>	pp = (dir > 0) ? p.right : p.left;
914	>	}
915	>
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<V> xp, xpp;
922	>	if (f != null)
923	>	f.prev = x;
924	>	if (dir <= 0)
925	>	p.left = x;
926	>	else
927	>	p.right = x;
928	>	x.red = true;
929	>	while (x != null && (xp = x.parent) != null && xp.red &&
930	>	(xpp = xp.parent) != null) {
931	>	TreeNode<V> xppl = xpp.left;
932	>	if (xp == xppl) {
933	>	TreeNode<V> y = xpp.right;
934	>	if (y != null && y.red) {
935	>	y.red = false;
936	>	xp.red = false;
937	>	xpp.red = true;
938	>	x = xpp;
939	>	}
940	>	else {
941	>	if (x == xp.right) {
942	>	rotateLeft(x = xp);
943	>	xpp = (xp = x.parent) == null ? null : xp.parent;
944	>	}
945	>	if (xp != null) {
946	>	xp.red = false;
947	>	if (xpp != null) {
948	>	xpp.red = true;
949	>	rotateRight(xpp);
950		}
951		}
460	–	if (runBit == 0)
461	–	lo = lastRun;
462	–	else
463	–	hi = lastRun;
464	–	for (Node p = e; p != lastRun; p = p.next) {
465	–	int ph = p.hash;
466	–	Object pk = p.key, pv = p.val;
467	–	if ((ph & n) == 0)
468	–	lo = new Node(ph, pk, pv, lo);
469	–	else
470	–	hi = new Node(ph, pk, pv, hi);
471	–	}
472	–	setTabAt(nextTab, i, lo);
473	–	setTabAt(nextTab, i + n, hi);
474	–	setTabAt(tab, i, fwd);
952		}
953		}
954	<	if (validated)
954	>	else {
955	>	TreeNode<V> y = xppl;
956	>	if (y != null && y.red) {
957	>	y.red = false;
958	>	xp.red = false;
959	>	xpp.red = true;
960	>	x = xpp;
961	>	}
962	>	else {
963	>	if (x == xp.left) {
964	>	rotateRight(x = xp);
965	>	xpp = (xp = x.parent) == null ? null : xp.parent;
966	>	}
967	>	if (xp != null) {
968	>	xp.red = false;
969	>	if (xpp != null) {
970	>	xpp.red = true;
971	>	rotateLeft(xpp);
972	>	}
973	>	}
974	>	}
975	>	}
976	>	}
977	>	TreeNode<V> r = root;
978	>	if (r != null && r.red)
979	>	r.red = false;
980	>	}
981	>	return null;
982	>	}
983	>
984	>	/**
985	>	* Removes the given node, that must be present before this
986	>	* call.  This is messier than typical red-black deletion code
987	>	* because we cannot swap the contents of an interior node
988	>	* with a leaf successor that is pinned by "next" pointers
989	>	* that are accessible independently of lock. So instead we
990	>	* swap the tree linkages.
991	>	*/
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<V> replacement;
1002	>	TreeNode<V> pl = p.left;
1003	>	TreeNode<V> pr = p.right;
1004	>	if (pl != null && pr != null) {
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<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<V> sp = s.parent;
1017	>	if ((p.parent = sp) != null) {
1018	>	if (s == sp.left)
1019	>	sp.left = p;
1020	>	else
1021	>	sp.right = p;
1022	>	}
1023	>	if ((s.right = pr) != null)
1024	>	pr.parent = s;
1025	>	}
1026	>	p.left = null;
1027	>	if ((p.right = sr) != null)
1028	>	sr.parent = p;
1029	>	if ((s.left = pl) != null)
1030	>	pl.parent = s;
1031	>	if ((s.parent = pp) == null)
1032	>	root = s;
1033	>	else if (p == pp.left)
1034	>	pp.left = s;
1035	>	else
1036	>	pp.right = s;
1037	>	replacement = sr;
1038	>	}
1039	>	else
1040	>	replacement = (pl != null) ? pl : pr;
1041	>	TreeNode<V> pp = p.parent;
1042	>	if (replacement == null) {
1043	>	if (pp == null) {
1044	>	root = null;
1045	>	return;
1046	>	}
1047	>	replacement = p;
1048	>	}
1049	>	else {
1050	>	replacement.parent = pp;
1051	>	if (pp == null)
1052	>	root = replacement;
1053	>	else if (p == pp.left)
1054	>	pp.left = replacement;
1055	>	else
1056	>	pp.right = replacement;
1057	>	p.left = p.right = p.parent = null;
1058	>	}
1059	>	if (!p.red) { // rebalance, from CLR
1060	>	TreeNode<V> x = replacement;
1061	>	while (x != null) {
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<V> sib = xp.right;
1069	+	if (sib != null && sib.red) {
1070	+	sib.red = false;
1071	+	xp.red = true;
1072	+	rotateLeft(xp);
1073	+	sib = (xp = x.parent) == null ? null : xp.right;
1074	+	}
1075	+	if (sib == null)
1076	+	x = xp;
1077	+	else {
1078	+	TreeNode<V> sl = sib.left, sr = sib.right;
1079	+	if ((sr == null || !sr.red) &&
1080	+	(sl == null || !sl.red)) {
1081	+	sib.red = true;
1082	+	x = xp;
1083	+	}
1084	+	else {
1085	+	if (sr == null || !sr.red) {
1086	+	if (sl != null)
1087	+	sl.red = false;
1088	+	sib.red = true;
1089	+	rotateRight(sib);
1090	+	sib = (xp = x.parent) == null ?
1091	+	null : xp.right;
1092	+	}
1093	+	if (sib != null) {
1094	+	sib.red = (xp == null) ? false : xp.red;
1095	+	if ((sr = sib.right) != null)
1096	+	sr.red = false;
1097	+	}
1098	+	if (xp != null) {
1099	+	xp.red = false;
1100	+	rotateLeft(xp);
1101	+	}
1102	+	x = root;
1103	+	}
1104	+	}
1105	+	}
1106	+	else { // symmetric
1107	+	TreeNode<V> sib = xpl;
1108	+	if (sib != null && sib.red) {
1109	+	sib.red = false;
1110	+	xp.red = true;
1111	+	rotateRight(xp);
1112	+	sib = (xp = x.parent) == null ? null : xp.left;
1113	+	}
1114	+	if (sib == null)
1115	+	x = xp;
1116	+	else {
1117	+	TreeNode<V> sl = sib.left, sr = sib.right;
1118	+	if ((sl == null || !sl.red) &&
1119	+	(sr == null || !sr.red)) {
1120	+	sib.red = true;
1121	+	x = xp;
1122	+	}
1123	+	else {
1124	+	if (sl == null || !sl.red) {
1125	+	if (sr != null)
1126	+	sr.red = false;
1127	+	sib.red = true;
1128	+	rotateLeft(sib);
1129	+	sib = (xp = x.parent) == null ?
1130	+	null : xp.left;
1131	+	}
1132	+	if (sib != null) {
1133	+	sib.red = (xp == null) ? false : xp.red;
1134	+	if ((sl = sib.left) != null)
1135	+	sl.red = false;
1136	+	}
1137	+	if (xp != null) {
1138	+	xp.red = false;
1139	+	rotateRight(xp);
1140	+	}
1141	+	x = root;
1142	+	}
1143	+	}
1144	+	}
1145		}
1146	<	else if (casTabAt(tab, i, e, fwd))
1147	<	break;
1146	>	}
1147	>	if (p == replacement && (pp = p.parent) != null) {
1148	>	if (p == pp.left) // detach pointers
1149	>	pp.left = null;
1150	>	else if (p == pp.right)
1151	>	pp.right = null;
1152	>	p.parent = null;
1153		}
1154		}
1155		}
1156
1157	<	/* ---------------- Internal access and update methods -------------- */
1157	>	/* ---------------- Collision reduction methods -------------- */
1158
1159		/**
1160	<	* Applies a supplemental hash function to a given hashCode, which
1161	<	* defends against poor quality hash functions.  The result must
1162	<	* be non-negative, and for reasonable performance must have good
1163	<	* avalanche properties; i.e., that each bit of the argument
1164	<	* affects each bit (except sign bit) of the result.
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
1164	>	* consecutive whole numbers in small tables.)  To counter this,
1165	>	* we apply a transform that spreads the impact of higher bits
1166	>	* downward. There is a tradeoff between speed, utility, and
1167	>	* quality of bit-spreading. Because many common sets of hashes
1168	>	* are already reasonably distributed across bits (so don't benefit
1169	>	* from spreading), and because we use trees to handle large sets
1170	>	* of collisions in bins, we don't need excessively high quality.
1171		*/
1172		private static final int spread(int h) {
1173	<	// Apply base step of MurmurHash; see http://code.google.com/p/smhasher/
1174	<	h ^= h >>> 16;
1175	<	h *= 0x85ebca6b;
1176	<	h ^= h >>> 13;
1177	<	h *= 0xc2b2ae35;
1178	<	return (h >>> 16) ^ (h & 0x7fffffff); // mask out sign bit
1173	>	h ^= (h >>> 18) ^ (h >>> 12);
1174	>	return (h ^ (h >>> 10)) & HASH_BITS;
1175	>	}
1176	>
1177	>	/**
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; 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) == h) {
1199	<	if ((ev = e.val) != null &&
1200	<	((ek = e.key) == k || k.equals(ek)))
1201	<	return ev;
1202	<	}
1203	<	else if (eh < 0) {          // sign bit set
1204	<	tab = (Node[])e.key;    // bin was moved during resize
517	<	continue retry;
1198	>	if ((eh = e.hash) < 0) {
1199	>	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
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 == h && (ev = e.val) != null &&
1207	+	((ek = e.key) == k || k.equals(ek)))
1208	+	return ev;
1209		}
1210		break;
1211		}
1212		return null;
1213		}
1214
1215	+	/**
1216	+	* Implementation for the four public remove/replace methods:
1217	+	* Replaces node value with v, conditional upon match of cv if
1218	+	* non-null.  If resulting value is null, delete.
1219	+	*/
1220	+	@SuppressWarnings("unchecked") private final V internalReplace
1221	+	(Object k, V v, Object cv) {
1222	+	int h = spread(k.hashCode());
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) < 0) {
1230	+	if ((fk = f.key) instanceof TreeBin) {
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<V> p = t.getTreeNode(h, k, t.root);
1239	+	if (p != null) {
1240	+	V pv = p.val;
1241	+	if (cv == null || cv == pv || cv.equals(pv)) {
1242	+	oldVal = pv;
1243	+	if ((p.val = v) == null) {
1244	+	deleted = true;
1245	+	t.deleteTreeNode(p);
1246	+	}
1247	+	}
1248	+	}
1249	+	}
1250	+	} finally {
1251	+	t.release(0);
1252	+	}
1253	+	if (validated) {
1254	+	if (deleted)
1255	+	addCount(-1L, -1);
1256	+	break;
1257	+	}
1258	+	}
1259	+	else
1260	+	tab = (Node<V>[])fk;
1261	+	}
1262	+	else if (fh != h && f.next == null) // precheck
1263	+	break;                          // rules out possible existence
1264	+	else {
1265	+	boolean validated = false;
1266	+	boolean deleted = false;
1267	+	synchronized (f) {
1268	+	if (tabAt(tab, i) == f) {
1269	+	validated = true;
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<V> en = e.next;
1280	+	if (pred != null)
1281	+	pred.next = en;
1282	+	else
1283	+	setTabAt(tab, i, en);
1284	+	}
1285	+	}
1286	+	break;
1287	+	}
1288	+	pred = e;
1289	+	if ((e = e.next) == null)
1290	+	break;
1291	+	}
1292	+	}
1293	+	}
1294	+	if (validated) {
1295	+	if (deleted)
1296	+	addCount(-1L, -1);
1297	+	break;
1298	+	}
1299	+	}
1300	+	}
1301	+	return oldVal;
1302	+	}
1303	+
1304	+	/*
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 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 and putIfAbsent */
1323	<	private final Object internalPut(Object k, Object v, boolean replace) {
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	<	Object oldVal = null;               // previous value or null if none
1328	<	for (Node[] tab = table;;) {
1329	<	Node e; int i; Object ek, ev;
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 = growTable();
1332	<	else if ((e = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1333	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1331	>	tab = initTable();
1332	>	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == 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 (e.hash < 0)             // resized -- restart with new table
1337	<	tab = (Node[])e.key;
1338	<	else if (!replace && e.hash == h && (ev = e.val) != null &&
1339	<	((ek = e.key) == k || k.equals(ek))) {
1340	<	if (tabAt(tab, i) == e) {    // inspect and validate 1st node
1341	<	oldVal = ev;             // without lock for putIfAbsent
1342	<	break;
1336	>	else if ((fh = f.hash) < 0) {
1337	>	if ((fk = f.key) instanceof TreeBin) {
1338	>	TreeBin<V> t = (TreeBin<V>)fk;
1339	>	V oldVal = null;
1340	>	t.acquire(0);
1341	>	try {
1342	>	if (tabAt(tab, i) == f) {
1343	>	len = 2;
1344	>	TreeNode<V> p = t.putTreeNode(h, k, v);
1345	>	if (p != null) {
1346	>	oldVal = p.val;
1347	>	if (!onlyIfAbsent)
1348	>	p.val = v;
1349	>	}
1350	>	}
1351	>	} finally {
1352	>	t.release(0);
1353	>	}
1354	>	if (len != 0) {
1355	>	if (oldVal != null)
1356	>	return oldVal;
1357	>	break;
1358	>	}
1359		}
1360	+	else
1361	+	tab = (Node<V>[])fk;
1362		}
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	<	boolean validated = false;
1368	<	boolean checkSize = false;
1369	<	synchronized (e) {           // lock the 1st node of bin list
1370	<	if (tabAt(tab, i) == e) {
1371	<	validated = true;    // retry if 1st already deleted
1372	<	for (Node first = e;;) {
1367	>	V oldVal = null;
1368	>	synchronized (f) {
1369	>	if (tabAt(tab, i) == f) {
1370	>	len = 1;
1371	>	for (Node<V> e = f;; ++len) {
1372	>	Object ek; V ev;
1373		if (e.hash == h &&
1374	<	((ek = e.key) == k || k.equals(ek)) &&
1375	<	(ev = e.val) != null) {
1374	>	(ev = e.val) != null &&
1375	>	((ek = e.key) == k || k.equals(ek))) {
1376		oldVal = ev;
1377	<	if (replace)
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 (last != first || tab.length <= 64)
1385	<	checkSize = true;
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		}
1390		}
1391	<	if (validated) {
1392	<	if (checkSize && tab.length < MAXIMUM_CAPACITY &&
1393	<	resizing == 0 && counter.sum() >= (long)threshold)
574	<	growTable();
1391	>	if (len != 0) {
1392	>	if (oldVal != null)
1393	>	return oldVal;
1394		break;
1395		}
1396		}
1397		}
1398	<	if (oldVal == null)
1399	<	counter.increment();             // update counter outside of locks
581	<	return oldVal;
1398	>	addCount(1L, len);
1399	>	return null;
1400		}
1401
1402	<	/**
1403	<	* Implementation for the four public remove/replace methods:
1404	<	* Replaces node value with v, conditional upon match of cv if
1405	<	* non-null.  If resulting value is null, delete.
1406	<	*/
589	<	private final Object internalReplace(Object k, Object v, Object cv) {
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	<	for (Node[] tab = table;;) {
1409	<	Node e; int i;
1410	<	if (tab == null ||
1411	<	(e = tabAt(tab, i = (tab.length - 1) & h)) == null)
1412	<	return null;
1413	<	else if (e.hash < 0)
1414	<	tab = (Node[])e.key;
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	>	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 (f.hash < 0) {
1432	>	if ((fk = f.key) instanceof TreeBin) {
1433	>	TreeBin<V> t = (TreeBin<V>)fk;
1434	>	boolean added = false;
1435	>	t.acquire(0);
1436	>	try {
1437	>	if (tabAt(tab, i) == f) {
1438	>	len = 1;
1439	>	TreeNode<V> p = t.getTreeNode(h, k, t.root);
1440	>	if (p != null)
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 (len != 0) {
1452	>	if (!added)
1453	>	return val;
1454	>	break;
1455	>	}
1456	>	}
1457	>	else
1458	>	tab = (Node<V>[])fk;
1459	>	}
1460		else {
1461	<	Object oldVal = null;
1462	<	boolean validated = false;
1463	<	boolean deleted = false;
1464	<	synchronized (e) {
1465	<	if (tabAt(tab, i) == e) {
1466	<	validated = true;
1467	<	Node pred = null;
1468	<	do {
1469	<	Object ek, ev;
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	>	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	<	((ek = e.key) == k || k.equals(ek)) &&
1475	<	((ev = e.val) != null)) {
1476	<	if (cv == null || cv == ev || cv.equals(ev)) {
1477	<	oldVal = ev;
1478	<	if ((e.val = v) == null) {
1479	<	deleted = true;
1480	<	Node en = e.next;
1481	<	if (pred != null)
1482	<	pred.next = en;
1483	<	else
1484	<	setTabAt(tab, i, en);
1485	<	}
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);
1486		}
1487		break;
1488		}
1489	<	} while ((e = (pred = e).next) != null);
1489	>	}
1490		}
1491		}
1492	<	if (validated) {
1493	<	if (deleted)
1494	<	counter.decrement();
1495	<	return oldVal;
1492	>	if (len != 0) {
1493	>	if (!added)
1494	>	return val;
1495	>	break;
1496		}
1497		}
1498		}
1499	+	if (val != null)
1500	+	addCount(1L, len);
1501	+	return val;
1502		}
1503
1504	<	/** Implementation for computeIfAbsent and compute. Like put, but messier. */
1505	<	@SuppressWarnings("unchecked")
1506	<	private final V internalCompute(K k,
1507	<	MappingFunction<? super K, ? extends V> f,
1508	<	boolean replace) {
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		V val = null;
1512	<	boolean added = false;
1513	<	Node[] tab = table;
1514	<	outer:for (;;) {
1515	<	Node e; int i; Object ek, ev;
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 = growTable();
1518	<	else if ((e = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1519	<	Node node = new Node(h, k, null, null);
1520	<	boolean validated = false;
1521	<	synchronized (node) {  // must lock while computing value
1517	>	tab = initTable();
1518	>	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
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)) {
654	–	validated = true;
1524		try {
1525	<	val = f.map(k);
1526	<	if (val != null) {
1525	>	len = 1;
1526	>	if ((val = mf.apply(k, null)) != null) {
1527		node.val = val;
1528	<	added = true;
1528	>	delta = 1;
1529		}
1530		} finally {
1531	<	if (!added)
1531	>	if (delta == 0)
1532		setTabAt(tab, i, null);
1533		}
1534		}
1535		}
1536	<	if (validated)
1536	>	if (len != 0)
1537		break;
1538		}
1539	<	else if (e.hash < 0)
1540	<	tab = (Node[])e.key;
1541	<	else if (!replace && e.hash == h && (ev = e.val) != null &&
1542	<	((ek = e.key) == k || k.equals(ek))) {
1543	<	if (tabAt(tab, i) == e) {
1544	<	val = (V)ev;
1545	<	break;
1539	>	else if ((fh = f.hash) < 0) {
1540	>	if ((fk = f.key) instanceof TreeBin) {
1541	>	TreeBin<V> t = (TreeBin<V>)fk;
1542	>	t.acquire(0);
1543	>	try {
1544	>	if (tabAt(tab, i) == f) {
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 (len != 0)
1568	>	break;
1569		}
1570	+	else
1571	+	tab = (Node<V>[])fk;
1572		}
679	–	else if (Thread.holdsLock(e))
680	–	throw new IllegalStateException("Recursive map computation");
1573		else {
1574	<	boolean validated = false;
1575	<	boolean checkSize = false;
1576	<	synchronized (e) {
1577	<	if (tabAt(tab, i) == e) {
1578	<	validated = true;
687	<	for (Node first = e;;) {
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	<	((ek = e.key) == k || k.equals(ek)) &&
1581	<	((ev = e.val) != null)) {
1582	<	Object fv;
1583	<	if (replace && (fv = f.map(k)) != null)
1584	<	ev = e.val = fv;
1585	<	val = (V)ev;
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		break;
1594		}
1595	<	Node last = e;
1595	>	pred = e;
1596		if ((e = e.next) == null) {
1597	<	if ((val = f.map(k)) != null) {
1598	<	last.next = new Node(h, k, val, null);
1599	<	added = true;
1600	<	if (last != first || tab.length <= 64)
1601	<	checkSize = true;
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		}
1607		}
1608		}
1609	<	if (validated) {
1610	<	if (checkSize && tab.length < MAXIMUM_CAPACITY &&
1611	<	resizing == 0 && counter.sum() >= (long)threshold)
1612	<	growTable();
1609	>	if (len != 0)
1610	>	break;
1611	>	}
1612	>	}
1613	>	if (delta != 0)
1614	>	addCount((long)delta, len);
1615	>	return val;
1616	>	}
1617	>
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	>	V val = null;
1625	>	int delta = 0;
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	>	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 (f.hash < 0) {
1639	+	if ((fk = f.key) instanceof TreeBin) {
1640	+	TreeBin<V> t = (TreeBin<V>)fk;
1641	+	t.acquire(0);
1642	+	try {
1643	+	if (tabAt(tab, i) == f) {
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	+	len = 2;
1652	+	delta = 1;
1653	+	t.putTreeNode(h, k, val);
1654	+	}
1655	+	}
1656	+	else if (p != null) {
1657	+	delta = -1;
1658	+	t.deleteTreeNode(p);
1659	+	}
1660	+	}
1661	+	} finally {
1662	+	t.release(0);
1663	+	}
1664	+	if (len != 0)
1665	+	break;
1666	+	}
1667	+	else
1668	+	tab = (Node<V>[])fk;
1669	+	}
1670	+	else {
1671	+	synchronized (f) {
1672	+	if (tabAt(tab, i) == f) {
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.apply(ev, v);
1680	+	if (val != null)
1681	+	e.val = val;
1682	+	else {
1683	+	delta = -1;
1684	+	Node<V> en = e.next;
1685	+	if (pred != null)
1686	+	pred.next = en;
1687	+	else
1688	+	setTabAt(tab, i, en);
1689	+	}
1690	+	break;
1691	+	}
1692	+	pred = e;
1693	+	if ((e = e.next) == null) {
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	+	}
1703	+	}
1704	+	if (len != 0)
1705	+	break;
1706	+	}
1707		}
1708	<	if (added)
1709	<	counter.increment();
1708	>	if (delta != 0)
1709	>	addCount((long)delta, len);
1710		return val;
1711		}
1712
1713	+	/** Implementation for putAll */
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<?, ? 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<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<V>(h, k, v, null))) {
1734	+	++delta;
1735	+	break;
1736	+	}
1737	+	}
1738	+	else if ((fh = f.hash) < 0) {
1739	+	if ((fk = f.key) instanceof TreeBin) {
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<V> p = t.getTreeNode(h, k, t.root);
1747	+	if (p != null)
1748	+	p.val = v;
1749	+	else {
1750	+	t.putTreeNode(h, k, v);
1751	+	++delta;
1752	+	}
1753	+	}
1754	+	} finally {
1755	+	t.release(0);
1756	+	}
1757	+	if (validated)
1758	+	break;
1759	+	}
1760	+	else
1761	+	tab = (Node<V>[])fk;
1762	+	}
1763	+	else {
1764	+	int len = 0;
1765	+	synchronized (f) {
1766	+	if (tabAt(tab, i) == f) {
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<V> last = e;
1777	+	if ((e = e.next) == null) {
1778	+	++delta;
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	+	}
1786	+	}
1787	+	if (len != 0) {
1788	+	if (len > 1) {
1789	+	addCount(delta, len);
1790	+	delta = 0L;
1791	+	}
1792	+	break;
1793	+	}
1794	+	}
1795	+	}
1796	+	}
1797	+	} finally {
1798	+	if (delta != 0L)
1799	+	addCount(delta, 2);
1800	+	}
1801	+	if (npe)
1802	+	throw new NullPointerException();
1803	+	}
1804	+
1805		/**
1806	<	* Implementation for clear. Steps through each bin, removing all nodes.
1806	>	* Implementation for clear. Steps through each bin, removing all
1807	>	* nodes.
1808		*/
1809	<	private final void internalClear() {
1809	>	@SuppressWarnings("unchecked") private final void internalClear() {
1810		long delta = 0L; // negative number of deletions
1811		int i = 0;
1812	<	Node[] tab = table;
1812	>	Node<V>[] tab = table;
1813		while (tab != null && i < tab.length) {
1814	<	Node e = tabAt(tab, i);
1815	<	if (e == null)
1814	>	Node<V> f = tabAt(tab, i);
1815	>	if (f == null)
1816		++i;
1817	<	else if (e.hash < 0)
1818	<	tab = (Node[])e.key;
1817	>	else if (f.hash < 0) {
1818	>	Object fk;
1819	>	if ((fk = f.key) instanceof TreeBin) {
1820	>	TreeBin<V> t = (TreeBin<V>)fk;
1821	>	t.acquire(0);
1822	>	try {
1823	>	if (tabAt(tab, i) == f) {
1824	>	for (Node<V> p = t.first; p != null; p = p.next) {
1825	>	if (p.val != null) { // (currently always true)
1826	>	p.val = null;
1827	>	--delta;
1828	>	}
1829	>	}
1830	>	t.first = null;
1831	>	t.root = null;
1832	>	++i;
1833	>	}
1834	>	} finally {
1835	>	t.release(0);
1836	>	}
1837	>	}
1838	>	else
1839	>	tab = (Node<V>[])fk;
1840	>	}
1841		else {
1842	<	boolean validated = false;
1843	<	synchronized (e) {
1844	<	if (tabAt(tab, i) == e) {
1845	<	validated = true;
741	<	Node en;
742	<	do {
743	<	en = e.next;
744	<	if (e.val != null) { // currently always true
1842	>	synchronized (f) {
1843	>	if (tabAt(tab, i) == f) {
1844	>	for (Node<V> e = f; e != null; e = e.next) {
1845	>	if (e.val != null) {  // (currently always true)
1846		e.val = null;
1847		--delta;
1848		}
1849	<	} while ((e = en) != null);
1849	>	}
1850		setTabAt(tab, i, null);
1851	+	++i;
1852	+	}
1853	+	}
1854	+	}
1855	+	}
1856	+	if (delta != 0L)
1857	+	addCount(delta, -1);
1858	+	}
1859	+
1860	+	/* ---------------- Table Initialization and Resizing -------------- */
1861	+
1862	+	/**
1863	+	* Returns a power of two table size for the given desired capacity.
1864	+	* See Hackers Delight, sec 3.2
1865	+	*/
1866	+	private static final int tableSizeFor(int c) {
1867	+	int n = c - 1;
1868	+	n |= n >>> 1;
1869	+	n |= n >>> 2;
1870	+	n |= n >>> 4;
1871	+	n |= n >>> 8;
1872	+	n |= n >>> 16;
1873	+	return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;
1874	+	}
1875	+
1876	+	/**
1877	+	* Initializes table, using the size recorded in sizeCtl.
1878	+	*/
1879	+	@SuppressWarnings("unchecked") private final Node<V>[] initTable() {
1880	+	Node<V>[] tab; int sc;
1881	+	while ((tab = table) == null) {
1882	+	if ((sc = sizeCtl) < 0)
1883	+	Thread.yield(); // lost initialization race; just spin
1884	+	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
1885	+	try {
1886	+	if ((tab = table) == null) {
1887	+	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
1888	+	@SuppressWarnings("rawtypes") Node[] tb = new Node[n];
1889	+	table = tab = (Node<V>[])tb;
1890	+	sc = n - (n >>> 2);
1891	+	}
1892	+	} finally {
1893	+	sizeCtl = sc;
1894	+	}
1895	+	break;
1896	+	}
1897	+	}
1898	+	return tab;
1899	+	}
1900	+
1901	+	/**
1902	+	* Adds to count, and if table is too small and not already
1903	+	* resizing, initiates transfer. If already resizing, helps
1904	+	* perform transfer if work is available.  Rechecks occupancy
1905	+	* after a transfer to see if another resize is already needed
1906	+	* because resizings are lagging additions.
1907	+	*
1908	+	* @param x the count to add
1909	+	* @param check if <0, don't check resize, if <= 1 only check if uncontended
1910	+	*/
1911	+	private final void addCount(long x, int check) {
1912	+	CounterCell[] as; long b, s;
1913	+	if ((as = counterCells) != null ||
1914	+	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
1915	+	CounterHashCode hc; CounterCell a; long v; int m;
1916	+	boolean uncontended = true;
1917	+	if ((hc = threadCounterHashCode.get()) == null ||
1918	+	as == null || (m = as.length - 1) < 0 ||
1919	+	(a = as[m & hc.code]) == null ||
1920	+	!(uncontended =
1921	+	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
1922	+	fullAddCount(x, hc, uncontended);
1923	+	return;
1924	+	}
1925	+	if (check <= 1)
1926	+	return;
1927	+	s = sumCount();
1928	+	}
1929	+	if (check >= 0) {
1930	+	Node<V>[] tab, nt; int sc;
1931	+	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
1932	+	tab.length < MAXIMUM_CAPACITY) {
1933	+	if (sc < 0) {
1934	+	if (sc == -1 || transferIndex <= transferOrigin ||
1935	+	(nt = nextTable) == null)
1936	+	break;
1937	+	if (U.compareAndSwapInt(this, SIZECTL, sc, sc - 1))
1938	+	transfer(tab, nt);
1939	+	}
1940	+	else if (U.compareAndSwapInt(this, SIZECTL, sc, -2))
1941	+	transfer(tab, null);
1942	+	s = sumCount();
1943	+	}
1944	+	}
1945	+	}
1946	+
1947	+	/**
1948	+	* Tries to presize table to accommodate the given number of elements.
1949	+	*
1950	+	* @param size number of elements (doesn't need to be perfectly accurate)
1951	+	*/
1952	+	@SuppressWarnings("unchecked") private final void tryPresize(int size) {
1953	+	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
1954	+	tableSizeFor(size + (size >>> 1) + 1);
1955	+	int sc;
1956	+	while ((sc = sizeCtl) >= 0) {
1957	+	Node<V>[] tab = table; int n;
1958	+	if (tab == null || (n = tab.length) == 0) {
1959	+	n = (sc > c) ? sc : c;
1960	+	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
1961	+	try {
1962	+	if (table == tab) {
1963	+	@SuppressWarnings("rawtypes") Node[] tb = new Node[n];
1964	+	table = (Node<V>[])tb;
1965	+	sc = n - (n >>> 2);
1966	+	}
1967	+	} finally {
1968	+	sizeCtl = sc;
1969	+	}
1970	+	}
1971	+	}
1972	+	else if (c <= sc || n >= MAXIMUM_CAPACITY)
1973	+	break;
1974	+	else if (tab == table &&
1975	+	U.compareAndSwapInt(this, SIZECTL, sc, -2))
1976	+	transfer(tab, null);
1977	+	}
1978	+	}
1979	+
1980	+	/*
1981	+	* Moves and/or copies the nodes in each bin to new table. See
1982	+	* above for explanation.
1983	+	*/
1984	+	@SuppressWarnings("unchecked") private final void transfer
1985	+	(Node<V>[] tab, Node<V>[] nextTab) {
1986	+	int n = tab.length, stride;
1987	+	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
1988	+	stride = MIN_TRANSFER_STRIDE; // subdivide range
1989	+	if (nextTab == null) {            // initiating
1990	+	try {
1991	+	@SuppressWarnings("rawtypes") Node[] tb = new Node[n << 1];
1992	+	nextTab = (Node<V>[])tb;
1993	+	} catch (Throwable ex) {      // try to cope with OOME
1994	+	sizeCtl = Integer.MAX_VALUE;
1995	+	return;
1996	+	}
1997	+	nextTable = nextTab;
1998	+	transferOrigin = n;
1999	+	transferIndex = n;
2000	+	Node<V> rev = new Node<V>(MOVED, tab, null, null);
2001	+	for (int k = n; k > 0;) {    // progressively reveal ready slots
2002	+	int nextk = (k > stride) ? k - stride : 0;
2003	+	for (int m = nextk; m < k; ++m)
2004	+	nextTab[m] = rev;
2005	+	for (int m = n + nextk; m < n + k; ++m)
2006	+	nextTab[m] = rev;
2007	+	U.putOrderedInt(this, TRANSFERORIGIN, k = nextk);
2008	+	}
2009	+	}
2010	+	int nextn = nextTab.length;
2011	+	Node<V> fwd = new Node<V>(MOVED, nextTab, null, null);
2012	+	boolean advance = true;
2013	+	for (int i = 0, bound = 0;;) {
2014	+	int nextIndex, nextBound; Node<V> f; Object fk;
2015	+	while (advance) {
2016	+	if (--i >= bound)
2017	+	advance = false;
2018	+	else if ((nextIndex = transferIndex) <= transferOrigin) {
2019	+	i = -1;
2020	+	advance = false;
2021	+	}
2022	+	else if (U.compareAndSwapInt
2023	+	(this, TRANSFERINDEX, nextIndex,
2024	+	nextBound = (nextIndex > stride ?
2025	+	nextIndex - stride : 0))) {
2026	+	bound = nextBound;
2027	+	i = nextIndex - 1;
2028	+	advance = false;
2029	+	}
2030	+	}
2031	+	if (i < 0 || i >= n || i + n >= nextn) {
2032	+	for (int sc;;) {
2033	+	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, ++sc)) {
2034	+	if (sc == -1) {
2035	+	nextTable = null;
2036	+	table = nextTab;
2037	+	sizeCtl = (n << 1) - (n >>> 1);
2038	+	}
2039	+	return;
2040	+	}
2041	+	}
2042	+	}
2043	+	else if ((f = tabAt(tab, i)) == null) {
2044	+	if (casTabAt(tab, i, null, fwd)) {
2045	+	setTabAt(nextTab, i, null);
2046	+	setTabAt(nextTab, i + n, null);
2047	+	advance = true;
2048	+	}
2049	+	}
2050	+	else if (f.hash >= 0) {
2051	+	synchronized (f) {
2052	+	if (tabAt(tab, i) == f) {
2053	+	int runBit = f.hash & n;
2054	+	Node<V> lastRun = f, lo = null, hi = null;
2055	+	for (Node<V> p = f.next; p != null; p = p.next) {
2056	+	int b = p.hash & n;
2057	+	if (b != runBit) {
2058	+	runBit = b;
2059	+	lastRun = p;
2060	+	}
2061	+	}
2062	+	if (runBit == 0)
2063	+	lo = lastRun;
2064	+	else
2065	+	hi = lastRun;
2066	+	for (Node<V> p = f; p != lastRun; p = p.next) {
2067	+	int ph = p.hash;
2068	+	Object pk = p.key; V pv = p.val;
2069	+	if ((ph & n) == 0)
2070	+	lo = new Node<V>(ph, pk, pv, lo);
2071	+	else
2072	+	hi = new Node<V>(ph, pk, pv, hi);
2073	+	}
2074	+	setTabAt(nextTab, i, lo);
2075	+	setTabAt(nextTab, i + n, hi);
2076	+	setTabAt(tab, i, fwd);
2077	+	advance = true;
2078	+	}
2079	+	}
2080	+	}
2081	+	else if ((fk = f.key) instanceof TreeBin) {
2082	+	TreeBin<V> t = (TreeBin<V>)fk;
2083	+	t.acquire(0);
2084	+	try {
2085	+	if (tabAt(tab, i) == f) {
2086	+	TreeBin<V> lt = new TreeBin<V>();
2087	+	TreeBin<V> ht = new TreeBin<V>();
2088	+	int lc = 0, hc = 0;
2089	+	for (Node<V> e = t.first; e != null; e = e.next) {
2090	+	int h = e.hash;
2091	+	Object k = e.key; V v = e.val;
2092	+	if ((h & n) == 0) {
2093	+	++lc;
2094	+	lt.putTreeNode(h, k, v);
2095	+	}
2096	+	else {
2097	+	++hc;
2098	+	ht.putTreeNode(h, k, v);
2099	+	}
2100	+	}
2101	+	Node<V> ln, hn; // throw away trees if too small
2102	+	if (lc < TREE_THRESHOLD) {
2103	+	ln = null;
2104	+	for (Node<V> p = lt.first; p != null; p = p.next)
2105	+	ln = new Node<V>(p.hash, p.key, p.val, ln);
2106	+	}
2107	+	else
2108	+	ln = new Node<V>(MOVED, lt, null, null);
2109	+	setTabAt(nextTab, i, ln);
2110	+	if (hc < TREE_THRESHOLD) {
2111	+	hn = null;
2112	+	for (Node<V> p = ht.first; p != null; p = p.next)
2113	+	hn = new Node<V>(p.hash, p.key, p.val, hn);
2114	+	}
2115	+	else
2116	+	hn = new Node<V>(MOVED, ht, null, null);
2117	+	setTabAt(nextTab, i + n, hn);
2118	+	setTabAt(tab, i, fwd);
2119	+	advance = true;
2120	+	}
2121	+	} finally {
2122	+	t.release(0);
2123	+	}
2124	+	}
2125	+	else
2126	+	advance = true; // already processed
2127	+	}
2128	+	}
2129	+
2130	+	/* ---------------- Counter support -------------- */
2131	+
2132	+	final long sumCount() {
2133	+	CounterCell[] as = counterCells; CounterCell a;
2134	+	long sum = baseCount;
2135	+	if (as != null) {
2136	+	for (int i = 0; i < as.length; ++i) {
2137	+	if ((a = as[i]) != null)
2138	+	sum += a.value;
2139	+	}
2140	+	}
2141	+	return sum;
2142	+	}
2143	+
2144	+	// See LongAdder version for explanation
2145	+	private final void fullAddCount(long x, CounterHashCode hc,
2146	+	boolean wasUncontended) {
2147	+	int h;
2148	+	if (hc == null) {
2149	+	hc = new CounterHashCode();
2150	+	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
2151	+	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
2152	+	threadCounterHashCode.set(hc);
2153	+	}
2154	+	else
2155	+	h = hc.code;
2156	+	boolean collide = false;                // True if last slot nonempty
2157	+	for (;;) {
2158	+	CounterCell[] as; CounterCell a; int n; long v;
2159	+	if ((as = counterCells) != null && (n = as.length) > 0) {
2160	+	if ((a = as[(n - 1) & h]) == null) {
2161	+	if (counterBusy == 0) {            // Try to attach new Cell
2162	+	CounterCell r = new CounterCell(x); // Optimistic create
2163	+	if (counterBusy == 0 &&
2164	+	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2165	+	boolean created = false;
2166	+	try {               // Recheck under lock
2167	+	CounterCell[] rs; int m, j;
2168	+	if ((rs = counterCells) != null &&
2169	+	(m = rs.length) > 0 &&
2170	+	rs[j = (m - 1) & h] == null) {
2171	+	rs[j] = r;
2172	+	created = true;
2173	+	}
2174	+	} finally {
2175	+	counterBusy = 0;
2176	+	}
2177	+	if (created)
2178	+	break;
2179	+	continue;           // Slot is now non-empty
2180	+	}
2181		}
2182	+	collide = false;
2183		}
2184	<	if (validated)
2185	<	++i;
2184	>	else if (!wasUncontended)       // CAS already known to fail
2185	>	wasUncontended = true;      // Continue after rehash
2186	>	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
2187	>	break;
2188	>	else if (counterCells != as || n >= NCPU)
2189	>	collide = false;            // At max size or stale
2190	>	else if (!collide)
2191	>	collide = true;
2192	>	else if (counterBusy == 0 &&
2193	>	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2194	>	try {
2195	>	if (counterCells == as) {// Expand table unless stale
2196	>	CounterCell[] rs = new CounterCell[n << 1];
2197	>	for (int i = 0; i < n; ++i)
2198	>	rs[i] = as[i];
2199	>	counterCells = rs;
2200	>	}
2201	>	} finally {
2202	>	counterBusy = 0;
2203	>	}
2204	>	collide = false;
2205	>	continue;                   // Retry with expanded table
2206	>	}
2207	>	h ^= h << 13;                   // Rehash
2208	>	h ^= h >>> 17;
2209	>	h ^= h << 5;
2210		}
2211	+	else if (counterBusy == 0 && counterCells == as &&
2212	+	U.compareAndSwapInt(this, COUNTERBUSY, 0, 1)) {
2213	+	boolean init = false;
2214	+	try {                           // Initialize table
2215	+	if (counterCells == as) {
2216	+	CounterCell[] rs = new CounterCell[2];
2217	+	rs[h & 1] = new CounterCell(x);
2218	+	counterCells = rs;
2219	+	init = true;
2220	+	}
2221	+	} finally {
2222	+	counterBusy = 0;
2223	+	}
2224	+	if (init)
2225	+	break;
2226	+	}
2227	+	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
2228	+	break;                          // Fall back on using base
2229		}
2230	<	counter.add(delta);
2230	>	hc.code = h;                            // Record index for next time
2231		}
2232
2233		/* ----------------Table Traversal -------------- */
2234
2235		/**
2236		* Encapsulates traversal for methods such as containsValue; also
2237	<	* serves as a base class for other iterators.
2237	>	* serves as a base class for other iterators and bulk tasks.
2238		*
2239		* At each step, the iterator snapshots the key ("nextKey") and
2240		* value ("nextVal") of a valid node (i.e., one that, at point of
2241	<	* snapshot, has a nonnull user value). Because val fields can
2241	>	* snapshot, has a non-null user value). Because val fields can
2242		* change (including to null, indicating deletion), field nextVal
2243		* might not be accurate at point of use, but still maintains the
2244		* weak consistency property of holding a value that was once
2245	<	* valid.
2245	>	* valid. To support iterator.remove, the nextKey field is not
2246	>	* updated (nulled out) when the iterator cannot advance.
2247		*
2248		* Internal traversals directly access these fields, as in:
2249	<	* {@code while (it.next != null) { process(nextKey); it.advance(); }}
2249	>	* {@code while (it.advance() != null) { process(it.nextKey); }}
2250		*
2251	<	* Exported iterators (subclasses of ViewIterator) extract key,
2252	<	* value, or key-value pairs as return values of Iterator.next(),
2253	<	* and encapsulate the it.next check as hasNext();
2254	<	*
2255	<	* The iterator visits each valid node that was reachable upon
2256	<	* iterator construction once. It might miss some that were added
2257	<	* to a bin after the bin was visited, which is OK wrt consistency
2258	<	* guarantees. Maintaining this property in the face of possible
2259	<	* ongoing resizes requires a fair amount of bookkeeping state
2260	<	* that is difficult to optimize away amidst volatile accesses.
2261	<	* Even so, traversal maintains reasonable throughput.
2251	>	* Exported iterators must track whether the iterator has advanced
2252	>	* (in hasNext vs next) (by setting/checking/nulling field
2253	>	* nextVal), and then extract key, value, or key-value pairs as
2254	>	* return values of next().
2255	>	*
2256	>	* The iterator visits once each still-valid node that was
2257	>	* reachable upon iterator construction. It might miss some that
2258	>	* were added to a bin after the bin was visited, which is OK wrt
2259	>	* consistency guarantees. Maintaining this property in the face
2260	>	* of possible ongoing resizes requires a fair amount of
2261	>	* bookkeeping state that is difficult to optimize away amidst
2262	>	* volatile accesses.  Even so, traversal maintains reasonable
2263	>	* throughput.
2264		*
2265		* Normally, iteration proceeds bin-by-bin traversing lists.
2266		* However, if the table has been resized, then all future steps
#	Line 793 | Line 2270 | public class ConcurrentHashMapV8<K, V>
2270		* across threads, iteration terminates if a bounds checks fails
2271		* for a table read.
2272		*
2273	<	* The range-based constructor enables creation of parallel
2274	<	* range-splitting traversals. (Not yet implemented.)
2273	>	* This class extends CountedCompleter to streamline parallel
2274	>	* iteration in bulk operations. This adds only a few fields of
2275	>	* space overhead, which is small enough in cases where it is not
2276	>	* needed to not worry about it.  Because CountedCompleter is
2277	>	* Serializable, but iterators need not be, we need to add warning
2278	>	* suppressions.
2279		*/
2280	<	static class InternalIterator {
2281	<	Node next;           // the next entry to use
2282	<	Node last;           // the last entry used
2280	>	@SuppressWarnings("serial") static class Traverser<K,V,R>
2281	>	extends CountedCompleter<R> {
2282	>	final ConcurrentHashMapV8<K, V> map;
2283	>	Node<V> next;        // the next entry to use
2284		Object nextKey;      // cached key field of next
2285	<	Object nextVal;      // cached val field of next
2286	<	Node[] tab;          // current table; updated if resized
2285	>	V nextVal;           // cached val field of next
2286	>	Node<V>[] tab;       // current table; updated if resized
2287		int index;           // index of bin to use next
2288		int baseIndex;       // current index of initial table
2289	<	final int baseLimit; // index bound for initial table
2290	<	final int baseSize;  // initial table size
2289	>	int baseLimit;       // index bound for initial table
2290	>	int baseSize;        // initial table size
2291	>	int batch;           // split control
2292
2293		/** Creates iterator for all entries in the table. */
2294	<	InternalIterator(Node[] tab) {
2295	<	this.tab = tab;
2296	<	baseLimit = baseSize = (tab == null) ? 0 : tab.length;
2297	<	index = baseIndex = 0;
2298	<	next = null;
2299	<	advance();
2300	<	}
2301	<
2302	<	/** Creates iterator for the given range of the table */
2303	<	InternalIterator(Node[] tab, int lo, int hi) {
2304	<	this.tab = tab;
2305	<	baseSize = (tab == null) ? 0 : tab.length;
2306	<	baseLimit = (hi <= baseSize) ? hi : baseSize;
2307	<	index = baseIndex = lo;
2308	<	next = null;
2309	<	advance();
2310	<	}
2311	<
2312	<	/** Advances next. See above for explanation. */
2313	<	final void advance() {
2314	<	Node e = last = next;
2294	>	Traverser(ConcurrentHashMapV8<K, V> map) {
2295	>	this.map = map;
2296	>	}
2297	>
2298	>	/** Creates iterator for split() methods and task constructors */
2299	>	Traverser(ConcurrentHashMapV8<K,V> map, Traverser<K,V,?> it, int batch) {
2300	>	super(it);
2301	>	this.batch = batch;
2302	>	if ((this.map = map) != null && it != null) { // split parent
2303	>	Node<V>[] t;
2304	>	if ((t = it.tab) == null &&
2305	>	(t = it.tab = map.table) != null)
2306	>	it.baseLimit = it.baseSize = t.length;
2307	>	this.tab = t;
2308	>	this.baseSize = it.baseSize;
2309	>	int hi = this.baseLimit = it.baseLimit;
2310	>	it.baseLimit = this.index = this.baseIndex =
2311	>	(hi + it.baseIndex + 1) >>> 1;
2312	>	}
2313	>	}
2314	>
2315	>	/**
2316	>	* Advances next; returns nextVal or null if terminated.
2317	>	* See above for explanation.
2318	>	*/
2319	>	@SuppressWarnings("unchecked") final V advance() {
2320	>	Node<V> e = next;
2321	>	V ev = null;
2322		outer: do {
2323	<	if (e != null)                   // pass used or skipped node
2323	>	if (e != null)                  // advance past used/skipped node
2324		e = e.next;
2325	<	while (e == null) {              // get to next non-null bin
2326	<	Node[] t; int b, i, n;       // checks must use locals
2327	<	if ((b = baseIndex) >= baseLimit || (i = index) < 0 ||
2328	<	(t = tab) == null || i >= (n = t.length))
2325	>	while (e == null) {             // get to next non-null bin
2326	>	ConcurrentHashMapV8<K, V> m;
2327	>	Node<V>[] t; int b, i, n; Object ek; //  must use locals
2328	>	if ((t = tab) != null)
2329	>	n = t.length;
2330	>	else if ((m = map) != null && (t = tab = m.table) != null)
2331	>	n = baseLimit = baseSize = t.length;
2332	>	else
2333	>	break outer;
2334	>	if ((b = baseIndex) >= baseLimit ||
2335	>	(i = index) < 0 || i >= n)
2336		break outer;
2337	<	else if ((e = tabAt(t, i)) != null && e.hash < 0)
2338	<	tab = (Node[])e.key;     // restarts due to null val
2339	<	else                         // visit upper slots if present
2340	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2337	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
2338	>	if ((ek = e.key) instanceof TreeBin)
2339	>	e = ((TreeBin<V>)ek).first;
2340	>	else {
2341	>	tab = (Node<V>[])ek;
2342	>	continue;           // restarts due to null val
2343	>	}
2344	>	}                           // visit upper slots if present
2345	>	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2346		}
2347		nextKey = e.key;
2348	<	} while ((nextVal = e.val) == null); // skip deleted or special nodes
2348	>	} while ((ev = e.val) == null);    // skip deleted or special nodes
2349		next = e;
2350	+	return nextVal = ev;
2351		}
2352	+
2353	+	public final void remove() {
2354	+	Object k = nextKey;
2355	+	if (k == null && (advance() == null || (k = nextKey) == null))
2356	+	throw new IllegalStateException();
2357	+	map.internalReplace(k, null, null);
2358	+	}
2359	+
2360	+	public final boolean hasNext() {
2361	+	return nextVal != null || advance() != null;
2362	+	}
2363	+
2364	+	public final boolean hasMoreElements() { return hasNext(); }
2365	+
2366	+	public void compute() { } // default no-op CountedCompleter body
2367	+
2368	+	/**
2369	+	* Returns a batch value > 0 if this task should (and must) be
2370	+	* split, if so, adding to pending count, and in any case
2371	+	* updating batch value. The initial batch value is approx
2372	+	* exp2 of the number of times (minus one) to split task by
2373	+	* two before executing leaf action. This value is faster to
2374	+	* compute and more convenient to use as a guide to splitting
2375	+	* than is the depth, since it is used while dividing by two
2376	+	* anyway.
2377	+	*/
2378	+	final int preSplit() {
2379	+	ConcurrentHashMapV8<K, V> m; int b; Node<V>[] t;  ForkJoinPool pool;
2380	+	if ((b = batch) < 0 && (m = map) != null) { // force initialization
2381	+	if ((t = tab) == null && (t = tab = m.table) != null)
2382	+	baseLimit = baseSize = t.length;
2383	+	if (t != null) {
2384	+	long n = m.sumCount();
2385	+	int par = ((pool = getPool()) == null) ?
2386	+	ForkJoinPool.getCommonPoolParallelism() :
2387	+	pool.getParallelism();
2388	+	int sp = par << 3; // slack of 8
2389	+	b = (n <= 0L) ? 0 : (n < (long)sp) ? (int)n : sp;
2390	+	}
2391	+	}
2392	+	b = (b <= 1 || baseIndex == baseLimit) ? 0 : (b >>> 1);
2393	+	if ((batch = b) > 0)
2394	+	addToPendingCount(1);
2395	+	return b;
2396	+	}
2397	+
2398		}
2399
2400		/* ---------------- Public operations -------------- */
2401
2402		/**
2403	<	* Creates a new, empty map with the default initial table size (16),
2403	>	* Creates a new, empty map with the default initial table size (16).
2404		*/
2405		public ConcurrentHashMapV8() {
857	–	this.counter = new LongAdder();
858	–	this.targetCapacity = DEFAULT_CAPACITY;
2406		}
2407
2408		/**
#	Line 874 | Line 2421 | public class ConcurrentHashMapV8<K, V>
2421		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
2422		MAXIMUM_CAPACITY :
2423		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2424	<	this.counter = new LongAdder();
878	<	this.targetCapacity = cap;
2424	>	this.sizeCtl = cap;
2425		}
2426
2427		/**
#	Line 884 | Line 2430 | public class ConcurrentHashMapV8<K, V>
2430		* @param m the map
2431		*/
2432		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2433	<	this.counter = new LongAdder();
2434	<	this.targetCapacity = DEFAULT_CAPACITY;
889	<	putAll(m);
2433	>	this.sizeCtl = DEFAULT_CAPACITY;
2434	>	internalPutAll(m);
2435		}
2436
2437		/**
#	Line 933 | Line 2478 | public class ConcurrentHashMapV8<K, V>
2478		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
2479		initialCapacity = concurrencyLevel;   // as estimated threads
2480		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
2481	<	int cap =  ((size >= (long)MAXIMUM_CAPACITY) ?
2482	<	MAXIMUM_CAPACITY: tableSizeFor((int)size));
2483	<	this.counter = new LongAdder();
2484	<	this.targetCapacity = cap;
2481	>	int cap = (size >= (long)MAXIMUM_CAPACITY) ?
2482	>	MAXIMUM_CAPACITY : tableSizeFor((int)size);
2483	>	this.sizeCtl = cap;
2484	>	}
2485	>
2486	>	/**
2487	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2488	>	* from the given type to {@code Boolean.TRUE}.
2489	>	*
2490	>	* @return the new set
2491	>	*/
2492	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2493	>	return new KeySetView<K,Boolean>(new ConcurrentHashMapV8<K,Boolean>(),
2494	>	Boolean.TRUE);
2495	>	}
2496	>
2497	>	/**
2498	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2499	>	* from the given type to {@code Boolean.TRUE}.
2500	>	*
2501	>	* @param initialCapacity The implementation performs internal
2502	>	* sizing to accommodate this many elements.
2503	>	* @throws IllegalArgumentException if the initial capacity of
2504	>	* elements is negative
2505	>	* @return the new set
2506	>	*/
2507	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2508	>	return new KeySetView<K,Boolean>
2509	>	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2510		}
2511
2512		/**
2513		* {@inheritDoc}
2514		*/
2515		public boolean isEmpty() {
2516	<	return counter.sum() <= 0L; // ignore transient negative values
2516	>	return sumCount() <= 0L; // ignore transient negative values
2517		}
2518
2519		/**
2520		* {@inheritDoc}
2521		*/
2522		public int size() {
2523	<	long n = counter.sum();
2523	>	long n = sumCount();
2524		return ((n < 0L) ? 0 :
2525		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
2526		(int)n);
2527		}
2528
2529		/**
2530	+	* Returns the number of mappings. This method should be used
2531	+	* instead of {@link #size} because a ConcurrentHashMapV8 may
2532	+	* contain more mappings than can be represented as an int. The
2533	+	* value returned is an estimate; the actual count may differ if
2534	+	* there are concurrent insertions or removals.
2535	+	*
2536	+	* @return the number of mappings
2537	+	*/
2538	+	public long mappingCount() {
2539	+	long n = sumCount();
2540	+	return (n < 0L) ? 0L : n; // ignore transient negative values
2541	+	}
2542	+
2543	+	/**
2544		* Returns the value to which the specified key is mapped,
2545		* or {@code null} if this map contains no mapping for the key.
2546		*
#	Line 967 | Line 2551 | public class ConcurrentHashMapV8<K, V>
2551		*
2552		* @throws NullPointerException if the specified key is null
2553		*/
970	–	@SuppressWarnings("unchecked")
2554		public V get(Object key) {
2555	<	if (key == null)
2556	<	throw new NullPointerException();
2557	<	return (V)internalGet(key);
2555	>	return internalGet(key);
2556	>	}
2557	>
2558	>	/**
2559	>	* Returns the value to which the specified key is mapped,
2560	>	* or the given defaultValue if this map contains no mapping for the key.
2561	>	*
2562	>	* @param key the key
2563	>	* @param defaultValue the value to return if this map contains
2564	>	* no mapping for the given key
2565	>	* @return the mapping for the key, if present; else the defaultValue
2566	>	* @throws NullPointerException if the specified key is null
2567	>	*/
2568	>	public V getValueOrDefault(Object key, V defaultValue) {
2569	>	V v;
2570	>	return (v = internalGet(key)) == null ? defaultValue : v;
2571		}
2572
2573		/**
#	Line 984 | Line 2580 | public class ConcurrentHashMapV8<K, V>
2580		* @throws NullPointerException if the specified key is null
2581		*/
2582		public boolean containsKey(Object key) {
987	–	if (key == null)
988	–	throw new NullPointerException();
2583		return internalGet(key) != null;
2584		}
2585
#	Line 1002 | Line 2596 | public class ConcurrentHashMapV8<K, V>
2596		public boolean containsValue(Object value) {
2597		if (value == null)
2598		throw new NullPointerException();
2599	<	Object v;
2600	<	InternalIterator it = new InternalIterator(table);
2601	<	while (it.next != null) {
2602	<	if ((v = it.nextVal) == value || value.equals(v))
2599	>	V v;
2600	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2601	>	while ((v = it.advance()) != null) {
2602	>	if (v == value || value.equals(v))
2603		return true;
1010	–	it.advance();
2604		}
2605		return false;
2606		}
#	Line 1027 | Line 2620 | public class ConcurrentHashMapV8<K, V>
2620		*         {@code false} otherwise
2621		* @throws NullPointerException if the specified value is null
2622		*/
2623	<	public boolean contains(Object value) {
2623	>	@Deprecated public boolean contains(Object value) {
2624		return containsValue(value);
2625		}
2626
#	Line 1035 | Line 2628 | public class ConcurrentHashMapV8<K, V>
2628		* Maps the specified key to the specified value in this table.
2629		* Neither the key nor the value can be null.
2630		*
2631	<	* <p> The value can be retrieved by calling the {@code get} method
2631	>	* <p>The value can be retrieved by calling the {@code get} method
2632		* with a key that is equal to the original key.
2633		*
2634		* @param key key with which the specified value is to be associated
#	Line 1044 | Line 2637 | public class ConcurrentHashMapV8<K, V>
2637		*         {@code null} if there was no mapping for {@code key}
2638		* @throws NullPointerException if the specified key or value is null
2639		*/
1047	–	@SuppressWarnings("unchecked")
2640		public V put(K key, V value) {
2641	<	if (key == null || value == null)
1050	<	throw new NullPointerException();
1051	<	return (V)internalPut(key, value, true);
2641	>	return internalPut(key, value, false);
2642		}
2643
2644		/**
#	Line 1058 | Line 2648 | public class ConcurrentHashMapV8<K, V>
2648		*         or {@code null} if there was no mapping for the key
2649		* @throws NullPointerException if the specified key or value is null
2650		*/
1061	–	@SuppressWarnings("unchecked")
2651		public V putIfAbsent(K key, V value) {
2652	<	if (key == null || value == null)
1064	<	throw new NullPointerException();
1065	<	return (V)internalPut(key, value, false);
2652	>	return internalPut(key, value, true);
2653		}
2654
2655		/**
#	Line 1073 | Line 2660 | public class ConcurrentHashMapV8<K, V>
2660		* @param m mappings to be stored in this map
2661		*/
2662		public void putAll(Map<? extends K, ? extends V> m) {
2663	<	if (m == null)
1077	<	throw new NullPointerException();
1078	<	/*
1079	<	* If uninitialized, try to adjust targetCapacity to
1080	<	* accommodate the given number of elements.
1081	<	*/
1082	<	if (table == null) {
1083	<	int size = m.size();
1084	<	int cap = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
1085	<	tableSizeFor(size + (size >>> 1) + 1);
1086	<	if (cap > targetCapacity)
1087	<	targetCapacity = cap;
1088	<	}
1089	<	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1090	<	put(e.getKey(), e.getValue());
2663	>	internalPutAll(m);
2664		}
2665
2666		/**
2667		* If the specified key is not already associated with a value,
2668	<	* computes its value using the given mappingFunction, and if
2669	<	* non-null, enters it into the map.  This is equivalent to
2670	<	*  <pre> {@code
2668	>	* computes its value using the given mappingFunction and enters
2669	>	* it into the map unless null.  This is equivalent to
2670	>	* <pre> {@code
2671		* if (map.containsKey(key))
2672		*   return map.get(key);
2673	<	* value = mappingFunction.map(key);
2673	>	* value = mappingFunction.apply(key);
2674		* if (value != null)
2675		*   map.put(key, value);
2676		* return value;}</pre>
2677		*
2678	<	* except that the action is performed atomically.  Some attempted
2679	<	* update operations on this map by other threads may be blocked
2680	<	* while computation is in progress, so the computation should be
2681	<	* short and simple, and must not attempt to update any other
2682	<	* mappings of this Map. The most appropriate usage is to
2678	>	* except that the action is performed atomically.  If the
2679	>	* function returns {@code null} no mapping is recorded. If the
2680	>	* function itself throws an (unchecked) exception, the exception
2681	>	* is rethrown to its caller, and no mapping is recorded.  Some
2682	>	* attempted update operations on this map by other threads may be
2683	>	* blocked while computation is in progress, so the computation
2684	>	* should be short and simple, and must not attempt to update any
2685	>	* other mappings of this Map. The most appropriate usage is to
2686		* construct a new object serving as an initial mapped value, or
2687		* memoized result, as in:
2688	+	*
2689		*  <pre> {@code
2690	<	* map.computeIfAbsent(key, new MappingFunction<K, V>() {
2690	>	* map.computeIfAbsent(key, new Fun<K, V>() {
2691		*   public V map(K k) { return new Value(f(k)); }});}</pre>
2692		*
2693		* @param key key with which the specified value is to be associated
2694		* @param mappingFunction the function to compute a value
2695		* @return the current (existing or computed) value associated with
2696	<	*         the specified key, or {@code null} if the computation
1120	<	*         returned {@code null}
2696	>	*         the specified key, or null if the computed value is null
2697		* @throws NullPointerException if the specified key or mappingFunction
2698		*         is null
2699		* @throws IllegalStateException if the computation detectably
#	Line 1126 | Line 2702 | public class ConcurrentHashMapV8<K, V>
2702		* @throws RuntimeException or Error if the mappingFunction does so,
2703		*         in which case the mapping is left unestablished
2704		*/
2705	<	public V computeIfAbsent(K key, MappingFunction<? super K, ? extends V> mappingFunction) {
2706	<	if (key == null || mappingFunction == null)
2707	<	throw new NullPointerException();
1132	<	return internalCompute(key, mappingFunction, false);
2705	>	public V computeIfAbsent
2706	>	(K key, Fun<? super K, ? extends V> mappingFunction) {
2707	>	return internalComputeIfAbsent(key, mappingFunction);
2708		}
2709
2710		/**
2711	<	* Computes the value associated with the given key using the given
2712	<	* mappingFunction, and if non-null, enters it into the map.  This
1138	<	* is equivalent to
2711	>	* If the given key is present, computes a new mapping value given a key and
2712	>	* its current mapped value. This is equivalent to
2713		*  <pre> {@code
2714	<	* value = mappingFunction.map(key);
2715	<	* if (value != null)
2716	<	*   map.put(key, value);
2717	<	* else
2718	<	*   value = map.get(key);
2719	<	* return value;}</pre>
2714	>	*   if (map.containsKey(key)) {
2715	>	*     value = remappingFunction.apply(key, map.get(key));
2716	>	*     if (value != null)
2717	>	*       map.put(key, value);
2718	>	*     else
2719	>	*       map.remove(key);
2720	>	*   }
2721	>	* }</pre>
2722	>	*
2723	>	* except that the action is performed atomically.  If the
2724	>	* function returns {@code null}, the mapping is removed.  If the
2725	>	* function itself throws an (unchecked) exception, the exception
2726	>	* is rethrown to its caller, and the current mapping is left
2727	>	* unchanged.  Some attempted update operations on this map by
2728	>	* other threads may be blocked while computation is in progress,
2729	>	* so the computation should be short and simple, and must not
2730	>	* attempt to update any other mappings of this Map. For example,
2731	>	* to either create or append new messages to a value mapping:
2732		*
2733	<	* except that the action is performed atomically.  Some attempted
2734	<	* update operations on this map by other threads may be blocked
2735	<	* while computation is in progress, so the computation should be
2736	<	* short and simple, and must not attempt to update any other
2737	<	* mappings of this Map.
2733	>	* @param key key with which the specified value is to be associated
2734	>	* @param remappingFunction the function to compute a value
2735	>	* @return the new value associated with the specified key, or null if none
2736	>	* @throws NullPointerException if the specified key or remappingFunction
2737	>	*         is null
2738	>	* @throws IllegalStateException if the computation detectably
2739	>	*         attempts a recursive update to this map that would
2740	>	*         otherwise never complete
2741	>	* @throws RuntimeException or Error if the remappingFunction does so,
2742	>	*         in which case the mapping is unchanged
2743	>	*/
2744	>	public V computeIfPresent
2745	>	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2746	>	return internalCompute(key, true, remappingFunction);
2747	>	}
2748	>
2749	>	/**
2750	>	* Computes a new mapping value given a key and
2751	>	* its current mapped value (or {@code null} if there is no current
2752	>	* mapping). This is equivalent to
2753	>	*  <pre> {@code
2754	>	*   value = remappingFunction.apply(key, map.get(key));
2755	>	*   if (value != null)
2756	>	*     map.put(key, value);
2757	>	*   else
2758	>	*     map.remove(key);
2759	>	* }</pre>
2760	>	*
2761	>	* except that the action is performed atomically.  If the
2762	>	* function returns {@code null}, the mapping is removed.  If the
2763	>	* function itself throws an (unchecked) exception, the exception
2764	>	* is rethrown to its caller, and the current mapping is left
2765	>	* unchanged.  Some attempted update operations on this map by
2766	>	* other threads may be blocked while computation is in progress,
2767	>	* so the computation should be short and simple, and must not
2768	>	* attempt to update any other mappings of this Map. For example,
2769	>	* to either create or append new messages to a value mapping:
2770	>	*
2771	>	* <pre> {@code
2772	>	* Map<Key, String> map = ...;
2773	>	* final String msg = ...;
2774	>	* map.compute(key, new BiFun<Key, String, String>() {
2775	>	*   public String apply(Key k, String v) {
2776	>	*    return (v == null) ? msg : v + msg;});}}</pre>
2777		*
2778		* @param key key with which the specified value is to be associated
2779	<	* @param mappingFunction the function to compute a value
2780	<	* @return the current value associated with
2781	<	*         the specified key, or {@code null} if the computation
1157	<	*         returned {@code null} and the value was not otherwise present
1158	<	* @throws NullPointerException if the specified key or mappingFunction
2779	>	* @param remappingFunction the function to compute a value
2780	>	* @return the new value associated with the specified key, or null if none
2781	>	* @throws NullPointerException if the specified key or remappingFunction
2782		*         is null
2783		* @throws IllegalStateException if the computation detectably
2784		*         attempts a recursive update to this map that would
2785		*         otherwise never complete
2786	<	* @throws RuntimeException or Error if the mappingFunction does so,
2786	>	* @throws RuntimeException or Error if the remappingFunction does so,
2787		*         in which case the mapping is unchanged
2788		*/
2789	<	public V compute(K key, MappingFunction<? super K, ? extends V> mappingFunction) {
2790	<	if (key == null || mappingFunction == null)
2791	<	throw new NullPointerException();
2792	<	return internalCompute(key, mappingFunction, true);
2789	>	public V compute
2790	>	(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
2791	>	return internalCompute(key, false, remappingFunction);
2792	>	}
2793	>
2794	>	/**
2795	>	* If the specified key is not already associated
2796	>	* with a value, associate it with the given value.
2797	>	* Otherwise, replace the value with the results of
2798	>	* the given remapping function. This is equivalent to:
2799	>	*  <pre> {@code
2800	>	*   if (!map.containsKey(key))
2801	>	*     map.put(value);
2802	>	*   else {
2803	>	*     newValue = remappingFunction.apply(map.get(key), value);
2804	>	*     if (value != null)
2805	>	*       map.put(key, value);
2806	>	*     else
2807	>	*       map.remove(key);
2808	>	*   }
2809	>	* }</pre>
2810	>	* except that the action is performed atomically.  If the
2811	>	* function returns {@code null}, the mapping is removed.  If the
2812	>	* function itself throws an (unchecked) exception, the exception
2813	>	* is rethrown to its caller, and the current mapping is left
2814	>	* unchanged.  Some attempted update operations on this map by
2815	>	* other threads may be blocked while computation is in progress,
2816	>	* so the computation should be short and simple, and must not
2817	>	* attempt to update any other mappings of this Map.
2818	>	*/
2819	>	public V merge
2820	>	(K key, V value,
2821	>	BiFun<? super V, ? super V, ? extends V> remappingFunction) {
2822	>	return internalMerge(key, value, remappingFunction);
2823		}
2824
2825		/**
#	Line 1178 | Line 2831 | public class ConcurrentHashMapV8<K, V>
2831		*         {@code null} if there was no mapping for {@code key}
2832		* @throws NullPointerException if the specified key is null
2833		*/
1181	–	@SuppressWarnings("unchecked")
2834		public V remove(Object key) {
2835	<	if (key == null)
1184	<	throw new NullPointerException();
1185	<	return (V)internalReplace(key, null, null);
2835	>	return internalReplace(key, null, null);
2836		}
2837
2838		/**
#	Line 1191 | Line 2841 | public class ConcurrentHashMapV8<K, V>
2841		* @throws NullPointerException if the specified key is null
2842		*/
2843		public boolean remove(Object key, Object value) {
2844	<	if (key == null)
1195	<	throw new NullPointerException();
1196	<	if (value == null)
1197	<	return false;
1198	<	return internalReplace(key, null, value) != null;
2844	>	return value != null && internalReplace(key, null, value) != null;
2845		}
2846
2847		/**
#	Line 1216 | Line 2862 | public class ConcurrentHashMapV8<K, V>
2862		*         or {@code null} if there was no mapping for the key
2863		* @throws NullPointerException if the specified key or value is null
2864		*/
1219	–	@SuppressWarnings("unchecked")
2865		public V replace(K key, V value) {
2866		if (key == null || value == null)
2867		throw new NullPointerException();
2868	<	return (V)internalReplace(key, value, null);
2868	>	return internalReplace(key, value, null);
2869		}
2870
2871		/**
#	Line 1233 | Line 2878 | public class ConcurrentHashMapV8<K, V>
2878		/**
2879		* Returns a {@link Set} view of the keys contained in this map.
2880		* The set is backed by the map, so changes to the map are
2881	<	* reflected in the set, and vice-versa.  The set supports element
1237	<	* removal, which removes the corresponding mapping from this map,
1238	<	* via the {@code Iterator.remove}, {@code Set.remove},
1239	<	* {@code removeAll}, {@code retainAll}, and {@code clear}
1240	<	* operations.  It does not support the {@code add} or
1241	<	* {@code addAll} operations.
2881	>	* reflected in the set, and vice-versa.
2882		*
2883	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
2884	<	* that will never throw {@link ConcurrentModificationException},
2885	<	* and guarantees to traverse elements as they existed upon
2886	<	* construction of the iterator, and may (but is not guaranteed to)
2887	<	* reflect any modifications subsequent to construction.
2883	>	* @return the set view
2884	>	*/
2885	>	public KeySetView<K,V> keySet() {
2886	>	KeySetView<K,V> ks = keySet;
2887	>	return (ks != null) ? ks : (keySet = new KeySetView<K,V>(this, null));
2888	>	}
2889	>
2890	>	/**
2891	>	* Returns a {@link Set} view of the keys in this map, using the
2892	>	* given common mapped value for any additions (i.e., {@link
2893	>	* Collection#add} and {@link Collection#addAll}). This is of
2894	>	* course only appropriate if it is acceptable to use the same
2895	>	* value for all additions from this view.
2896	>	*
2897	>	* @param mappedValue the mapped value to use for any
2898	>	* additions.
2899	>	* @return the set view
2900	>	* @throws NullPointerException if the mappedValue is null
2901		*/
2902	<	public Set<K> keySet() {
2903	<	KeySet<K,V> ks = keySet;
2904	<	return (ks != null) ? ks : (keySet = new KeySet<K,V>(this));
2902	>	public KeySetView<K,V> keySet(V mappedValue) {
2903	>	if (mappedValue == null)
2904	>	throw new NullPointerException();
2905	>	return new KeySetView<K,V>(this, mappedValue);
2906		}
2907
2908		/**
2909		* Returns a {@link Collection} view of the values contained in this map.
2910		* The collection is backed by the map, so changes to the map are
2911	<	* reflected in the collection, and vice-versa.  The collection
1258	<	* supports element removal, which removes the corresponding
1259	<	* mapping from this map, via the {@code Iterator.remove},
1260	<	* {@code Collection.remove}, {@code removeAll},
1261	<	* {@code retainAll}, and {@code clear} operations.  It does not
1262	<	* support the {@code add} or {@code addAll} operations.
1263	<	*
1264	<	* <p>The view's {@code iterator} is a "weakly consistent" iterator
1265	<	* that will never throw {@link ConcurrentModificationException},
1266	<	* and guarantees to traverse elements as they existed upon
1267	<	* construction of the iterator, and may (but is not guaranteed to)
1268	<	* reflect any modifications subsequent to construction.
2911	>	* reflected in the collection, and vice-versa.
2912		*/
2913	<	public Collection<V> values() {
2914	<	Values<K,V> vs = values;
2915	<	return (vs != null) ? vs : (values = new Values<K,V>(this));
2913	>	public ValuesView<K,V> values() {
2914	>	ValuesView<K,V> vs = values;
2915	>	return (vs != null) ? vs : (values = new ValuesView<K,V>(this));
2916		}
2917
2918		/**
#	Line 1289 | Line 2932 | public class ConcurrentHashMapV8<K, V>
2932		* reflect any modifications subsequent to construction.
2933		*/
2934		public Set<Map.Entry<K,V>> entrySet() {
2935	<	EntrySet<K,V> es = entrySet;
2936	<	return (es != null) ? es : (entrySet = new EntrySet<K,V>(this));
2935	>	EntrySetView<K,V> es = entrySet;
2936	>	return (es != null) ? es : (entrySet = new EntrySetView<K,V>(this));
2937		}
2938
2939		/**
#	Line 1314 | Line 2957 | public class ConcurrentHashMapV8<K, V>
2957		}
2958
2959		/**
2960	+	* Returns a partitionable iterator of the keys in this map.
2961	+	*
2962	+	* @return a partitionable iterator of the keys in this map
2963	+	*/
2964	+	public Spliterator<K> keySpliterator() {
2965	+	return new KeyIterator<K,V>(this);
2966	+	}
2967	+
2968	+	/**
2969	+	* Returns a partitionable iterator of the values in this map.
2970	+	*
2971	+	* @return a partitionable iterator of the values in this map
2972	+	*/
2973	+	public Spliterator<V> valueSpliterator() {
2974	+	return new ValueIterator<K,V>(this);
2975	+	}
2976	+
2977	+	/**
2978	+	* Returns a partitionable iterator of the entries in this map.
2979	+	*
2980	+	* @return a partitionable iterator of the entries in this map
2981	+	*/
2982	+	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2983	+	return new EntryIterator<K,V>(this);
2984	+	}
2985	+
2986	+	/**
2987		* Returns the hash code value for this {@link Map}, i.e.,
2988		* the sum of, for each key-value pair in the map,
2989		* {@code key.hashCode() ^ value.hashCode()}.
#	Line 1322 | Line 2992 | public class ConcurrentHashMapV8<K, V>
2992		*/
2993		public int hashCode() {
2994		int h = 0;
2995	<	InternalIterator it = new InternalIterator(table);
2996	<	while (it.next != null) {
2997	<	h += it.nextKey.hashCode() ^ it.nextVal.hashCode();
2998	<	it.advance();
2995	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
2996	>	V v;
2997	>	while ((v = it.advance()) != null) {
2998	>	h += it.nextKey.hashCode() ^ v.hashCode();
2999		}
3000		return h;
3001		}
#	Line 1342 | Line 3012 | public class ConcurrentHashMapV8<K, V>
3012		* @return a string representation of this map
3013		*/
3014		public String toString() {
3015	<	InternalIterator it = new InternalIterator(table);
3015	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3016		StringBuilder sb = new StringBuilder();
3017		sb.append('{');
3018	<	if (it.next != null) {
3018	>	V v;
3019	>	if ((v = it.advance()) != null) {
3020		for (;;) {
3021	<	Object k = it.nextKey, v = it.nextVal;
3021	>	Object k = it.nextKey;
3022		sb.append(k == this ? "(this Map)" : k);
3023		sb.append('=');
3024		sb.append(v == this ? "(this Map)" : v);
3025	<	it.advance();
1355	<	if (it.next == null)
3025	>	if ((v = it.advance()) == null)
3026		break;
3027		sb.append(',').append(' ');
3028		}
#	Line 1375 | Line 3045 | public class ConcurrentHashMapV8<K, V>
3045		if (!(o instanceof Map))
3046		return false;
3047		Map<?,?> m = (Map<?,?>) o;
3048	<	InternalIterator it = new InternalIterator(table);
3049	<	while (it.next != null) {
3050	<	Object val = it.nextVal;
3048	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3049	>	V val;
3050	>	while ((val = it.advance()) != null) {
3051		Object v = m.get(it.nextKey);
3052		if (v == null || (v != val && !v.equals(val)))
3053		return false;
1384	–	it.advance();
3054		}
3055		for (Map.Entry<?,?> e : m.entrySet()) {
3056		Object mk, mv, v;
#	Line 1397 | Line 3066 | public class ConcurrentHashMapV8<K, V>
3066
3067		/* ----------------Iterators -------------- */
3068
3069	<	/**
3070	<	* Base class for key, value, and entry iterators.  Adds a map
3071	<	* reference to InternalIterator to support Iterator.remove.
3072	<	*/
3073	<	static abstract class ViewIterator<K,V> extends InternalIterator {
3074	<	final ConcurrentHashMapV8<K, V> map;
1406	<	ViewIterator(ConcurrentHashMapV8<K, V> map) {
1407	<	super(map.table);
1408	<	this.map = map;
3069	>	@SuppressWarnings("serial") static final class KeyIterator<K,V>
3070	>	extends Traverser<K,V,Object>
3071	>	implements Spliterator<K>, Enumeration<K> {
3072	>	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3073	>	KeyIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3074	>	super(map, it, -1);
3075		}
3076	<
3077	<	public final void remove() {
1412	<	if (last == null)
3076	>	public KeyIterator<K,V> split() {
3077	>	if (nextKey != null)
3078		throw new IllegalStateException();
3079	<	map.remove(last.key);
1415	<	last = null;
3079	>	return new KeyIterator<K,V>(map, this);
3080		}
3081	<
3082	<	public final boolean hasNext()         { return next != null; }
1419	<	public final boolean hasMoreElements() { return next != null; }
1420	<	}
1421	<
1422	<	static final class KeyIterator<K,V> extends ViewIterator<K,V>
1423	<	implements Iterator<K>, Enumeration<K> {
1424	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
1425	<
1426	<	@SuppressWarnings("unchecked")
1427	<	public final K next() {
1428	<	if (next == null)
3081	>	@SuppressWarnings("unchecked") public final K next() {
3082	>	if (nextVal == null && advance() == null)
3083		throw new NoSuchElementException();
3084		Object k = nextKey;
3085	<	advance();
3086	<	return (K)k;
3085	>	nextVal = null;
3086	>	return (K) k;
3087		}
3088
3089		public final K nextElement() { return next(); }
3090		}
3091
3092	<	static final class ValueIterator<K,V> extends ViewIterator<K,V>
3093	<	implements Iterator<V>, Enumeration<V> {
3092	>	@SuppressWarnings("serial") static final class ValueIterator<K,V>
3093	>	extends Traverser<K,V,Object>
3094	>	implements Spliterator<V>, Enumeration<V> {
3095		ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3096	+	ValueIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3097	+	super(map, it, -1);
3098	+	}
3099	+	public ValueIterator<K,V> split() {
3100	+	if (nextKey != null)
3101	+	throw new IllegalStateException();
3102	+	return new ValueIterator<K,V>(map, this);
3103	+	}
3104
1442	–	@SuppressWarnings("unchecked")
3105		public final V next() {
3106	<	if (next == null)
3106	>	V v;
3107	>	if ((v = nextVal) == null && (v = advance()) == null)
3108		throw new NoSuchElementException();
3109	<	Object v = nextVal;
3110	<	advance();
1448	<	return (V)v;
3109	>	nextVal = null;
3110	>	return v;
3111		}
3112
3113		public final V nextElement() { return next(); }
3114		}
3115
3116	<	static final class EntryIterator<K,V> extends ViewIterator<K,V>
3117	<	implements Iterator<Map.Entry<K,V>> {
3116	>	@SuppressWarnings("serial") static final class EntryIterator<K,V>
3117	>	extends Traverser<K,V,Object>
3118	>	implements Spliterator<Map.Entry<K,V>> {
3119		EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3120	+	EntryIterator(ConcurrentHashMapV8<K, V> map, Traverser<K,V,Object> it) {
3121	+	super(map, it, -1);
3122	+	}
3123	+	public EntryIterator<K,V> split() {
3124	+	if (nextKey != null)
3125	+	throw new IllegalStateException();
3126	+	return new EntryIterator<K,V>(map, this);
3127	+	}
3128
3129	<	@SuppressWarnings("unchecked")
3130	<	public final Map.Entry<K,V> next() {
3131	<	if (next == null)
3129	>	@SuppressWarnings("unchecked") public final Map.Entry<K,V> next() {
3130	>	V v;
3131	>	if ((v = nextVal) == null && (v = advance()) == null)
3132		throw new NoSuchElementException();
3133		Object k = nextKey;
3134	<	Object v = nextVal;
3135	<	advance();
1465	<	return new WriteThroughEntry<K,V>(map, (K)k, (V)v);
3134	>	nextVal = null;
3135	>	return new MapEntry<K,V>((K)k, v, map);
3136		}
3137		}
3138
3139		/**
3140	<	* Custom Entry class used by EntryIterator.next(), that relays
1471	<	* setValue changes to the underlying map.
3140	>	* Exported Entry for iterators
3141		*/
3142	<	static final class WriteThroughEntry<K,V> implements Map.Entry<K, V> {
1474	<	final ConcurrentHashMapV8<K, V> map;
3142	>	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3143		final K key; // non-null
3144		V val;       // non-null
3145	<	WriteThroughEntry(ConcurrentHashMapV8<K, V> map, K key, V val) {
3146	<	this.map = map; this.key = key; this.val = val;
3145	>	final ConcurrentHashMapV8<K, V> map;
3146	>	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3147	>	this.key = key;
3148	>	this.val = val;
3149	>	this.map = map;
3150		}
1480	–
3151		public final K getKey()       { return key; }
3152		public final V getValue()     { return val; }
3153		public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
#	Line 1494 | Line 3164 | public class ConcurrentHashMapV8<K, V>
3164
3165		/**
3166		* Sets our entry's value and writes through to the map. The
3167	<	* value to return is somewhat arbitrary here. Since a
3168	<	* WriteThroughEntry does not necessarily track asynchronous
3169	<	* changes, the most recent "previous" value could be
3170	<	* different from what we return (or could even have been
3171	<	* removed in which case the put will re-establish). We do not
1502	<	* and cannot guarantee more.
3167	>	* value to return is somewhat arbitrary here. Since we do not
3168	>	* necessarily track asynchronous changes, the most recent
3169	>	* "previous" value could be different from what we return (or
3170	>	* could even have been removed in which case the put will
3171	>	* re-establish). We do not and cannot guarantee more.
3172		*/
3173		public final V setValue(V value) {
3174		if (value == null) throw new NullPointerException();
#	Line 1510 | Line 3179 | public class ConcurrentHashMapV8<K, V>
3179		}
3180		}
3181
3182	<	/* ----------------Views -------------- */
3183	<
3184	<	/*
1516	<	* These currently just extend java.util.AbstractX classes, but
1517	<	* may need a new custom base to support partitioned traversal.
3182	>	/**
3183	>	* Returns exportable snapshot entry for the given key and value
3184	>	* when write-through can't or shouldn't be used.
3185		*/
3186	<
3187	<	static final class KeySet<K,V> extends AbstractSet<K> {
1521	<	final ConcurrentHashMapV8<K, V> map;
1522	<	KeySet(ConcurrentHashMapV8<K, V> map)   { this.map = map; }
1523	<
1524	<	public final int size()                 { return map.size(); }
1525	<	public final boolean isEmpty()          { return map.isEmpty(); }
1526	<	public final void clear()               { map.clear(); }
1527	<	public final boolean contains(Object o) { return map.containsKey(o); }
1528	<	public final boolean remove(Object o)   { return map.remove(o) != null; }
1529	<	public final Iterator<K> iterator() {
1530	<	return new KeyIterator<K,V>(map);
1531	<	}
1532	<	}
1533	<
1534	<	static final class Values<K,V> extends AbstractCollection<V> {
1535	<	final ConcurrentHashMapV8<K, V> map;
1536	<	Values(ConcurrentHashMapV8<K, V> map)   { this.map = map; }
1537	<
1538	<	public final int size()                 { return map.size(); }
1539	<	public final boolean isEmpty()          { return map.isEmpty(); }
1540	<	public final void clear()               { map.clear(); }
1541	<	public final boolean contains(Object o) { return map.containsValue(o); }
1542	<	public final Iterator<V> iterator() {
1543	<	return new ValueIterator<K,V>(map);
1544	<	}
1545	<	}
1546	<
1547	<	static final class EntrySet<K,V> extends AbstractSet<Map.Entry<K,V>> {
1548	<	final ConcurrentHashMapV8<K, V> map;
1549	<	EntrySet(ConcurrentHashMapV8<K, V> map) { this.map = map; }
1550	<
1551	<	public final int size()                 { return map.size(); }
1552	<	public final boolean isEmpty()          { return map.isEmpty(); }
1553	<	public final void clear()               { map.clear(); }
1554	<	public final Iterator<Map.Entry<K,V>> iterator() {
1555	<	return new EntryIterator<K,V>(map);
1556	<	}
1557	<
1558	<	public final boolean contains(Object o) {
1559	<	Object k, v, r; Map.Entry<?,?> e;
1560	<	return ((o instanceof Map.Entry) &&
1561	<	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
1562	<	(r = map.get(k)) != null &&
1563	<	(v = e.getValue()) != null &&
1564	<	(v == r || v.equals(r)));
1565	<	}
1566	<
1567	<	public final boolean remove(Object o) {
1568	<	Object k, v; Map.Entry<?,?> e;
1569	<	return ((o instanceof Map.Entry) &&
1570	<	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
1571	<	(v = e.getValue()) != null &&
1572	<	map.remove(k, v));
1573	<	}
3186	>	static <K,V> AbstractMap.SimpleEntry<K,V> entryFor(K k, V v) {
3187	>	return new AbstractMap.SimpleEntry<K,V>(k, v);
3188		}
3189
3190		/* ---------------- Serialization Support -------------- */
#	Line 1594 | Line 3208 | public class ConcurrentHashMapV8<K, V>
3208		* for each key-value mapping, followed by a null pair.
3209		* The key-value mappings are emitted in no particular order.
3210		*/
3211	<	@SuppressWarnings("unchecked")
3212	<	private void writeObject(java.io.ObjectOutputStream s)
3213	<	throws java.io.IOException {
3211	>	@SuppressWarnings("unchecked") private void writeObject
3212	>	(java.io.ObjectOutputStream s)
3213	>	throws java.io.IOException {
3214		if (segments == null) { // for serialization compatibility
3215		segments = (Segment<K,V>[])
3216		new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
#	Line 1604 | Line 3218 | public class ConcurrentHashMapV8<K, V>
3218		segments[i] = new Segment<K,V>(LOAD_FACTOR);
3219		}
3220		s.defaultWriteObject();
3221	<	InternalIterator it = new InternalIterator(table);
3222	<	while (it.next != null) {
3221	>	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3222	>	V v;
3223	>	while ((v = it.advance()) != null) {
3224		s.writeObject(it.nextKey);
3225	<	s.writeObject(it.nextVal);
1611	<	it.advance();
3225	>	s.writeObject(v);
3226		}
3227		s.writeObject(null);
3228		s.writeObject(null);
#	Line 1619 | Line 3233 | public class ConcurrentHashMapV8<K, V>
3233		* Reconstitutes the instance from a stream (that is, deserializes it).
3234		* @param s the stream
3235		*/
3236	<	@SuppressWarnings("unchecked")
3237	<	private void readObject(java.io.ObjectInputStream s)
3238	<	throws java.io.IOException, ClassNotFoundException {
3236	>	@SuppressWarnings("unchecked") private void readObject
3237	>	(java.io.ObjectInputStream s)
3238	>	throws java.io.IOException, ClassNotFoundException {
3239		s.defaultReadObject();
3240		this.segments = null; // unneeded
1627	–	// initialize transient final field
1628	–	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
1629	–	this.targetCapacity = DEFAULT_CAPACITY;
3241
3242		// Create all nodes, then place in table once size is known
3243		long size = 0L;
3244	<	Node p = null;
3244	>	Node<V> p = null;
3245		for (;;) {
3246		K k = (K) s.readObject();
3247		V v = (V) s.readObject();
3248		if (k != null && v != null) {
3249	<	p = new Node(spread(k.hashCode()), k, v, p);
3249	>	int h = spread(k.hashCode());
3250	>	p = new Node<V>(h, k, v, p);
3251		++size;
3252		}
3253		else
#	Line 1643 | Line 3255 | public class ConcurrentHashMapV8<K, V>
3255		}
3256		if (p != null) {
3257		boolean init = false;
3258	<	if (resizing == 0 &&
3259	<	UNSAFE.compareAndSwapInt(this, resizingOffset, 0, 1)) {
3258	>	int n;
3259	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
3260	>	n = MAXIMUM_CAPACITY;
3261	>	else {
3262	>	int sz = (int)size;
3263	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
3264	>	}
3265	>	int sc = sizeCtl;
3266	>	boolean collide = false;
3267	>	if (n > sc &&
3268	>	U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
3269		try {
3270		if (table == null) {
3271		init = true;
3272	<	int n;
3273	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1653	<	n = MAXIMUM_CAPACITY;
1654	<	else {
1655	<	int sz = (int)size;
1656	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
1657	<	}
1658	<	threshold = n - (n >>> 2) - THRESHOLD_OFFSET;
1659	<	Node[] tab = new Node[n];
3272	>	@SuppressWarnings("rawtypes") Node[] rt = new Node[n];
3273	>	Node<V>[] tab = (Node<V>[])rt;
3274		int mask = n - 1;
3275		while (p != null) {
3276		int j = p.hash & mask;
3277	<	Node next = p.next;
3278	<	p.next = tabAt(tab, j);
3277	>	Node<V> next = p.next;
3278	>	Node<V> q = p.next = tabAt(tab, j);
3279		setTabAt(tab, j, p);
3280	+	if (!collide && q != null && q.hash == p.hash)
3281	+	collide = true;
3282		p = next;
3283		}
3284		table = tab;
3285	<	counter.add(size);
3285	>	addCount(size, -1);
3286	>	sc = n - (n >>> 2);
3287		}
3288		} finally {
3289	<	resizing = 0;
3289	>	sizeCtl = sc;
3290	>	}
3291	>	if (collide) { // rescan and convert to TreeBins
3292	>	Node<V>[] tab = table;
3293	>	for (int i = 0; i < tab.length; ++i) {
3294	>	int c = 0;
3295	>	for (Node<V> e = tabAt(tab, i); e != null; e = e.next) {
3296	>	if (++c > TREE_THRESHOLD &&
3297	>	(e.key instanceof Comparable)) {
3298	>	replaceWithTreeBin(tab, i, e.key);
3299	>	break;
3300	>	}
3301	>	}
3302	>	}
3303		}
3304		}
3305		if (!init) { // Can only happen if unsafely published.
3306		while (p != null) {
3307	<	internalPut(p.key, p.val, true);
3307	>	internalPut((K)p.key, p.val, false);
3308		p = p.next;
3309		}
3310		}
3311		}
3312		}
3313
3314	+	// -------------------------------------------------------
3315	+
3316	+	// Sams
3317	+	/** Interface describing a void action of one argument */
3318	+	public interface Action<A> { void apply(A a); }
3319	+	/** Interface describing a void action of two arguments */
3320	+	public interface BiAction<A,B> { void apply(A a, B b); }
3321	+	/** Interface describing a function of one argument */
3322	+	public interface Fun<A,T> { T apply(A a); }
3323	+	/** Interface describing a function of two arguments */
3324	+	public interface BiFun<A,B,T> { T apply(A a, B b); }
3325	+	/** Interface describing a function of no arguments */
3326	+	public interface Generator<T> { T apply(); }
3327	+	/** Interface describing a function mapping its argument to a double */
3328	+	public interface ObjectToDouble<A> { double apply(A a); }
3329	+	/** Interface describing a function mapping its argument to a long */
3330	+	public interface ObjectToLong<A> { long apply(A a); }
3331	+	/** Interface describing a function mapping its argument to an int */
3332	+	public interface ObjectToInt<A> {int apply(A a); }
3333	+	/** Interface describing a function mapping two arguments to a double */
3334	+	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
3335	+	/** Interface describing a function mapping two arguments to a long */
3336	+	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
3337	+	/** Interface describing a function mapping two arguments to an int */
3338	+	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
3339	+	/** Interface describing a function mapping a double to a double */
3340	+	public interface DoubleToDouble { double apply(double a); }
3341	+	/** Interface describing a function mapping a long to a long */
3342	+	public interface LongToLong { long apply(long a); }
3343	+	/** Interface describing a function mapping an int to an int */
3344	+	public interface IntToInt { int apply(int a); }
3345	+	/** Interface describing a function mapping two doubles to a double */
3346	+	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
3347	+	/** Interface describing a function mapping two longs to a long */
3348	+	public interface LongByLongToLong { long apply(long a, long b); }
3349	+	/** Interface describing a function mapping two ints to an int */
3350	+	public interface IntByIntToInt { int apply(int a, int b); }
3351	+
3352	+
3353	+	// -------------------------------------------------------
3354	+
3355	+	// Sequential bulk operations
3356	+
3357	+	/**
3358	+	* Performs the given action for each (key, value).
3359	+	*
3360	+	* @param action the action
3361	+	*/
3362	+	@SuppressWarnings("unchecked") public void forEachSequentially
3363	+	(BiAction<K,V> action) {
3364	+	if (action == null) throw new NullPointerException();
3365	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3366	+	V v;
3367	+	while ((v = it.advance()) != null)
3368	+	action.apply((K)it.nextKey, v);
3369	+	}
3370	+
3371	+	/**
3372	+	* Performs the given action for each non-null transformation
3373	+	* of each (key, value).
3374	+	*
3375	+	* @param transformer a function returning the transformation
3376	+	* for an element, or null of there is no transformation (in
3377	+	* which case the action is not applied).
3378	+	* @param action the action
3379	+	*/
3380	+	@SuppressWarnings("unchecked") public <U> void forEachSequentially
3381	+	(BiFun<? super K, ? super V, ? extends U> transformer,
3382	+	Action<U> action) {
3383	+	if (transformer == null || action == null)
3384	+	throw new NullPointerException();
3385	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3386	+	V v; U u;
3387	+	while ((v = it.advance()) != null) {
3388	+	if ((u = transformer.apply((K)it.nextKey, v)) != null)
3389	+	action.apply(u);
3390	+	}
3391	+	}
3392	+
3393	+	/**
3394	+	* Returns a non-null result from applying the given search
3395	+	* function on each (key, value), or null if none.
3396	+	*
3397	+	* @param searchFunction a function returning a non-null
3398	+	* result on success, else null
3399	+	* @return a non-null result from applying the given search
3400	+	* function on each (key, value), or null if none
3401	+	*/
3402	+	@SuppressWarnings("unchecked") public <U> U searchSequentially
3403	+	(BiFun<? super K, ? super V, ? extends U> searchFunction) {
3404	+	if (searchFunction == null) throw new NullPointerException();
3405	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3406	+	V v; U u;
3407	+	while ((v = it.advance()) != null) {
3408	+	if ((u = searchFunction.apply((K)it.nextKey, v)) != null)
3409	+	return u;
3410	+	}
3411	+	return null;
3412	+	}
3413	+
3414	+	/**
3415	+	* Returns the result of accumulating the given transformation
3416	+	* of all (key, value) pairs using the given reducer to
3417	+	* combine values, or null if none.
3418	+	*
3419	+	* @param transformer a function returning the transformation
3420	+	* for an element, or null of there is no transformation (in
3421	+	* which case it is not combined).
3422	+	* @param reducer a commutative associative combining function
3423	+	* @return the result of accumulating the given transformation
3424	+	* of all (key, value) pairs
3425	+	*/
3426	+	@SuppressWarnings("unchecked") public <U> U reduceSequentially
3427	+	(BiFun<? super K, ? super V, ? extends U> transformer,
3428	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3429	+	if (transformer == null || reducer == null)
3430	+	throw new NullPointerException();
3431	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3432	+	U r = null, u; V v;
3433	+	while ((v = it.advance()) != null) {
3434	+	if ((u = transformer.apply((K)it.nextKey, v)) != null)
3435	+	r = (r == null) ? u : reducer.apply(r, u);
3436	+	}
3437	+	return r;
3438	+	}
3439	+
3440	+	/**
3441	+	* Returns the result of accumulating the given transformation
3442	+	* of all (key, value) pairs using the given reducer to
3443	+	* combine values, and the given basis as an identity value.
3444	+	*
3445	+	* @param transformer a function returning the transformation
3446	+	* for an element
3447	+	* @param basis the identity (initial default value) for the reduction
3448	+	* @param reducer a commutative associative combining function
3449	+	* @return the result of accumulating the given transformation
3450	+	* of all (key, value) pairs
3451	+	*/
3452	+	@SuppressWarnings("unchecked") public double reduceToDoubleSequentially
3453	+	(ObjectByObjectToDouble<? super K, ? super V> transformer,
3454	+	double basis,
3455	+	DoubleByDoubleToDouble reducer) {
3456	+	if (transformer == null || reducer == null)
3457	+	throw new NullPointerException();
3458	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3459	+	double r = basis; V v;
3460	+	while ((v = it.advance()) != null)
3461	+	r = reducer.apply(r, transformer.apply((K)it.nextKey, v));
3462	+	return r;
3463	+	}
3464	+
3465	+	/**
3466	+	* Returns the result of accumulating the given transformation
3467	+	* of all (key, value) pairs using the given reducer to
3468	+	* combine values, and the given basis as an identity value.
3469	+	*
3470	+	* @param transformer a function returning the transformation
3471	+	* for an element
3472	+	* @param basis the identity (initial default value) for the reduction
3473	+	* @param reducer a commutative associative combining function
3474	+	* @return the result of accumulating the given transformation
3475	+	* of all (key, value) pairs
3476	+	*/
3477	+	@SuppressWarnings("unchecked") public long reduceToLongSequentially
3478	+	(ObjectByObjectToLong<? super K, ? super V> transformer,
3479	+	long basis,
3480	+	LongByLongToLong reducer) {
3481	+	if (transformer == null || reducer == null)
3482	+	throw new NullPointerException();
3483	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3484	+	long r = basis; V v;
3485	+	while ((v = it.advance()) != null)
3486	+	r = reducer.apply(r, transformer.apply((K)it.nextKey, v));
3487	+	return r;
3488	+	}
3489	+
3490	+	/**
3491	+	* Returns the result of accumulating the given transformation
3492	+	* of all (key, value) pairs using the given reducer to
3493	+	* combine values, and the given basis as an identity value.
3494	+	*
3495	+	* @param transformer a function returning the transformation
3496	+	* for an element
3497	+	* @param basis the identity (initial default value) for the reduction
3498	+	* @param reducer a commutative associative combining function
3499	+	* @return the result of accumulating the given transformation
3500	+	* of all (key, value) pairs
3501	+	*/
3502	+	@SuppressWarnings("unchecked") public int reduceToIntSequentially
3503	+	(ObjectByObjectToInt<? super K, ? super V> transformer,
3504	+	int basis,
3505	+	IntByIntToInt reducer) {
3506	+	if (transformer == null || reducer == null)
3507	+	throw new NullPointerException();
3508	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3509	+	int r = basis; V v;
3510	+	while ((v = it.advance()) != null)
3511	+	r = reducer.apply(r, transformer.apply((K)it.nextKey, v));
3512	+	return r;
3513	+	}
3514	+
3515	+	/**
3516	+	* Performs the given action for each key.
3517	+	*
3518	+	* @param action the action
3519	+	*/
3520	+	@SuppressWarnings("unchecked") public void forEachKeySequentially
3521	+	(Action<K> action) {
3522	+	if (action == null) throw new NullPointerException();
3523	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3524	+	while (it.advance() != null)
3525	+	action.apply((K)it.nextKey);
3526	+	}
3527	+
3528	+	/**
3529	+	* Performs the given action for each non-null transformation
3530	+	* of each key.
3531	+	*
3532	+	* @param transformer a function returning the transformation
3533	+	* for an element, or null of there is no transformation (in
3534	+	* which case the action is not applied).
3535	+	* @param action the action
3536	+	*/
3537	+	@SuppressWarnings("unchecked") public <U> void forEachKeySequentially
3538	+	(Fun<? super K, ? extends U> transformer,
3539	+	Action<U> action) {
3540	+	if (transformer == null || action == null)
3541	+	throw new NullPointerException();
3542	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3543	+	U u;
3544	+	while (it.advance() != null) {
3545	+	if ((u = transformer.apply((K)it.nextKey)) != null)
3546	+	action.apply(u);
3547	+	}
3548	+	ForkJoinTasks.forEachKey
3549	+	(this, transformer, action).invoke();
3550	+	}
3551	+
3552	+	/**
3553	+	* Returns a non-null result from applying the given search
3554	+	* function on each key, or null if none.
3555	+	*
3556	+	* @param searchFunction a function returning a non-null
3557	+	* result on success, else null
3558	+	* @return a non-null result from applying the given search
3559	+	* function on each key, or null if none
3560	+	*/
3561	+	@SuppressWarnings("unchecked") public <U> U searchKeysSequentially
3562	+	(Fun<? super K, ? extends U> searchFunction) {
3563	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3564	+	U u;
3565	+	while (it.advance() != null) {
3566	+	if ((u = searchFunction.apply((K)it.nextKey)) != null)
3567	+	return u;
3568	+	}
3569	+	return null;
3570	+	}
3571	+
3572	+	/**
3573	+	* Returns the result of accumulating all keys using the given
3574	+	* reducer to combine values, or null if none.
3575	+	*
3576	+	* @param reducer a commutative associative combining function
3577	+	* @return the result of accumulating all keys using the given
3578	+	* reducer to combine values, or null if none
3579	+	*/
3580	+	@SuppressWarnings("unchecked") public K reduceKeysSequentially
3581	+	(BiFun<? super K, ? super K, ? extends K> reducer) {
3582	+	if (reducer == null) throw new NullPointerException();
3583	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3584	+	K r = null;
3585	+	while (it.advance() != null) {
3586	+	K u = (K)it.nextKey;
3587	+	r = (r == null) ? u : reducer.apply(r, u);
3588	+	}
3589	+	return r;
3590	+	}
3591	+
3592	+	/**
3593	+	* Returns the result of accumulating the given transformation
3594	+	* of all keys using the given reducer to combine values, or
3595	+	* null if none.
3596	+	*
3597	+	* @param transformer a function returning the transformation
3598	+	* for an element, or null of there is no transformation (in
3599	+	* which case it is not combined).
3600	+	* @param reducer a commutative associative combining function
3601	+	* @return the result of accumulating the given transformation
3602	+	* of all keys
3603	+	*/
3604	+	@SuppressWarnings("unchecked") public <U> U reduceKeysSequentially
3605	+	(Fun<? super K, ? extends U> transformer,
3606	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3607	+	if (transformer == null || reducer == null)
3608	+	throw new NullPointerException();
3609	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3610	+	U r = null, u;
3611	+	while (it.advance() != null) {
3612	+	if ((u = transformer.apply((K)it.nextKey)) != null)
3613	+	r = (r == null) ? u : reducer.apply(r, u);
3614	+	}
3615	+	return r;
3616	+	}
3617	+
3618	+	/**
3619	+	* Returns the result of accumulating the given transformation
3620	+	* of all keys using the given reducer to combine values, and
3621	+	* the given basis as an identity value.
3622	+	*
3623	+	* @param transformer a function returning the transformation
3624	+	* for an element
3625	+	* @param basis the identity (initial default value) for the reduction
3626	+	* @param reducer a commutative associative combining function
3627	+	* @return  the result of accumulating the given transformation
3628	+	* of all keys
3629	+	*/
3630	+	@SuppressWarnings("unchecked") public double reduceKeysToDoubleSequentially
3631	+	(ObjectToDouble<? super K> transformer,
3632	+	double basis,
3633	+	DoubleByDoubleToDouble reducer) {
3634	+	if (transformer == null || reducer == null)
3635	+	throw new NullPointerException();
3636	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3637	+	double r = basis;
3638	+	while (it.advance() != null)
3639	+	r = reducer.apply(r, transformer.apply((K)it.nextKey));
3640	+	return r;
3641	+	}
3642	+
3643	+	/**
3644	+	* Returns the result of accumulating the given transformation
3645	+	* of all keys using the given reducer to combine values, and
3646	+	* the given basis as an identity value.
3647	+	*
3648	+	* @param transformer a function returning the transformation
3649	+	* for an element
3650	+	* @param basis the identity (initial default value) for the reduction
3651	+	* @param reducer a commutative associative combining function
3652	+	* @return the result of accumulating the given transformation
3653	+	* of all keys
3654	+	*/
3655	+	@SuppressWarnings("unchecked") public long reduceKeysToLongSequentially
3656	+	(ObjectToLong<? super K> transformer,
3657	+	long basis,
3658	+	LongByLongToLong reducer) {
3659	+	if (transformer == null || reducer == null)
3660	+	throw new NullPointerException();
3661	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3662	+	long r = basis;
3663	+	while (it.advance() != null)
3664	+	r = reducer.apply(r, transformer.apply((K)it.nextKey));
3665	+	return r;
3666	+	}
3667	+
3668	+	/**
3669	+	* Returns the result of accumulating the given transformation
3670	+	* of all keys using the given reducer to combine values, and
3671	+	* the given basis as an identity value.
3672	+	*
3673	+	* @param transformer a function returning the transformation
3674	+	* for an element
3675	+	* @param basis the identity (initial default value) for the reduction
3676	+	* @param reducer a commutative associative combining function
3677	+	* @return the result of accumulating the given transformation
3678	+	* of all keys
3679	+	*/
3680	+	@SuppressWarnings("unchecked") public int reduceKeysToIntSequentially
3681	+	(ObjectToInt<? super K> transformer,
3682	+	int basis,
3683	+	IntByIntToInt reducer) {
3684	+	if (transformer == null || reducer == null)
3685	+	throw new NullPointerException();
3686	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3687	+	int r = basis;
3688	+	while (it.advance() != null)
3689	+	r = reducer.apply(r, transformer.apply((K)it.nextKey));
3690	+	return r;
3691	+	}
3692	+
3693	+	/**
3694	+	* Performs the given action for each value.
3695	+	*
3696	+	* @param action the action
3697	+	*/
3698	+	public void forEachValueSequentially(Action<V> action) {
3699	+	if (action == null) throw new NullPointerException();
3700	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3701	+	V v;
3702	+	while ((v = it.advance()) != null)
3703	+	action.apply(v);
3704	+	}
3705	+
3706	+	/**
3707	+	* Performs the given action for each non-null transformation
3708	+	* of each value.
3709	+	*
3710	+	* @param transformer a function returning the transformation
3711	+	* for an element, or null of there is no transformation (in
3712	+	* which case the action is not applied).
3713	+	*/
3714	+	public <U> void forEachValueSequentially
3715	+	(Fun<? super V, ? extends U> transformer,
3716	+	Action<U> action) {
3717	+	if (transformer == null || action == null)
3718	+	throw new NullPointerException();
3719	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3720	+	V v; U u;
3721	+	while ((v = it.advance()) != null) {
3722	+	if ((u = transformer.apply(v)) != null)
3723	+	action.apply(u);
3724	+	}
3725	+	}
3726	+
3727	+	/**
3728	+	* Returns a non-null result from applying the given search
3729	+	* function on each value, or null if none.
3730	+	*
3731	+	* @param searchFunction a function returning a non-null
3732	+	* result on success, else null
3733	+	* @return a non-null result from applying the given search
3734	+	* function on each value, or null if none
3735	+	*/
3736	+	public <U> U searchValuesSequentially
3737	+	(Fun<? super V, ? extends U> searchFunction) {
3738	+	if (searchFunction == null) throw new NullPointerException();
3739	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3740	+	V v; U u;
3741	+	while ((v = it.advance()) != null) {
3742	+	if ((u = searchFunction.apply(v)) != null)
3743	+	return u;
3744	+	}
3745	+	return null;
3746	+	}
3747	+
3748	+	/**
3749	+	* Returns the result of accumulating all values using the
3750	+	* given reducer to combine values, or null if none.
3751	+	*
3752	+	* @param reducer a commutative associative combining function
3753	+	* @return  the result of accumulating all values
3754	+	*/
3755	+	public V reduceValuesSequentially
3756	+	(BiFun<? super V, ? super V, ? extends V> reducer) {
3757	+	if (reducer == null) throw new NullPointerException();
3758	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3759	+	V r = null; V v;
3760	+	while ((v = it.advance()) != null)
3761	+	r = (r == null) ? v : reducer.apply(r, v);
3762	+	return r;
3763	+	}
3764	+
3765	+	/**
3766	+	* Returns the result of accumulating the given transformation
3767	+	* of all values using the given reducer to combine values, or
3768	+	* null if none.
3769	+	*
3770	+	* @param transformer a function returning the transformation
3771	+	* for an element, or null of there is no transformation (in
3772	+	* which case it is not combined).
3773	+	* @param reducer a commutative associative combining function
3774	+	* @return the result of accumulating the given transformation
3775	+	* of all values
3776	+	*/
3777	+	public <U> U reduceValuesSequentially
3778	+	(Fun<? super V, ? extends U> transformer,
3779	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3780	+	if (transformer == null || reducer == null)
3781	+	throw new NullPointerException();
3782	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3783	+	U r = null, u; V v;
3784	+	while ((v = it.advance()) != null) {
3785	+	if ((u = transformer.apply(v)) != null)
3786	+	r = (r == null) ? u : reducer.apply(r, u);
3787	+	}
3788	+	return r;
3789	+	}
3790	+
3791	+	/**
3792	+	* Returns the result of accumulating the given transformation
3793	+	* of all values using the given reducer to combine values,
3794	+	* and the given basis as an identity value.
3795	+	*
3796	+	* @param transformer a function returning the transformation
3797	+	* for an element
3798	+	* @param basis the identity (initial default value) for the reduction
3799	+	* @param reducer a commutative associative combining function
3800	+	* @return the result of accumulating the given transformation
3801	+	* of all values
3802	+	*/
3803	+	public double reduceValuesToDoubleSequentially
3804	+	(ObjectToDouble<? super V> transformer,
3805	+	double basis,
3806	+	DoubleByDoubleToDouble reducer) {
3807	+	if (transformer == null || reducer == null)
3808	+	throw new NullPointerException();
3809	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3810	+	double r = basis; V v;
3811	+	while ((v = it.advance()) != null)
3812	+	r = reducer.apply(r, transformer.apply(v));
3813	+	return r;
3814	+	}
3815	+
3816	+	/**
3817	+	* Returns the result of accumulating the given transformation
3818	+	* of all values using the given reducer to combine values,
3819	+	* and the given basis as an identity value.
3820	+	*
3821	+	* @param transformer a function returning the transformation
3822	+	* for an element
3823	+	* @param basis the identity (initial default value) for the reduction
3824	+	* @param reducer a commutative associative combining function
3825	+	* @return the result of accumulating the given transformation
3826	+	* of all values
3827	+	*/
3828	+	public long reduceValuesToLongSequentially
3829	+	(ObjectToLong<? super V> transformer,
3830	+	long basis,
3831	+	LongByLongToLong reducer) {
3832	+	if (transformer == null || reducer == null)
3833	+	throw new NullPointerException();
3834	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3835	+	long r = basis; V v;
3836	+	while ((v = it.advance()) != null)
3837	+	r = reducer.apply(r, transformer.apply(v));
3838	+	return r;
3839	+	}
3840	+
3841	+	/**
3842	+	* Returns the result of accumulating the given transformation
3843	+	* of all values using the given reducer to combine values,
3844	+	* and the given basis as an identity value.
3845	+	*
3846	+	* @param transformer a function returning the transformation
3847	+	* for an element
3848	+	* @param basis the identity (initial default value) for the reduction
3849	+	* @param reducer a commutative associative combining function
3850	+	* @return the result of accumulating the given transformation
3851	+	* of all values
3852	+	*/
3853	+	public int reduceValuesToIntSequentially
3854	+	(ObjectToInt<? super V> transformer,
3855	+	int basis,
3856	+	IntByIntToInt reducer) {
3857	+	if (transformer == null || reducer == null)
3858	+	throw new NullPointerException();
3859	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3860	+	int r = basis; V v;
3861	+	while ((v = it.advance()) != null)
3862	+	r = reducer.apply(r, transformer.apply(v));
3863	+	return r;
3864	+	}
3865	+
3866	+	/**
3867	+	* Performs the given action for each entry.
3868	+	*
3869	+	* @param action the action
3870	+	*/
3871	+	@SuppressWarnings("unchecked") public void forEachEntrySequentially
3872	+	(Action<Map.Entry<K,V>> action) {
3873	+	if (action == null) throw new NullPointerException();
3874	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3875	+	V v;
3876	+	while ((v = it.advance()) != null)
3877	+	action.apply(entryFor((K)it.nextKey, v));
3878	+	}
3879	+
3880	+	/**
3881	+	* Performs the given action for each non-null transformation
3882	+	* of each entry.
3883	+	*
3884	+	* @param transformer a function returning the transformation
3885	+	* for an element, or null of there is no transformation (in
3886	+	* which case the action is not applied).
3887	+	* @param action the action
3888	+	*/
3889	+	@SuppressWarnings("unchecked") public <U> void forEachEntrySequentially
3890	+	(Fun<Map.Entry<K,V>, ? extends U> transformer,
3891	+	Action<U> action) {
3892	+	if (transformer == null || action == null)
3893	+	throw new NullPointerException();
3894	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3895	+	V v; U u;
3896	+	while ((v = it.advance()) != null) {
3897	+	if ((u = transformer.apply(entryFor((K)it.nextKey, v))) != null)
3898	+	action.apply(u);
3899	+	}
3900	+	}
3901	+
3902	+	/**
3903	+	* Returns a non-null result from applying the given search
3904	+	* function on each entry, or null if none.
3905	+	*
3906	+	* @param searchFunction a function returning a non-null
3907	+	* result on success, else null
3908	+	* @return a non-null result from applying the given search
3909	+	* function on each entry, or null if none
3910	+	*/
3911	+	@SuppressWarnings("unchecked") public <U> U searchEntriesSequentially
3912	+	(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
3913	+	if (searchFunction == null) throw new NullPointerException();
3914	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3915	+	V v; U u;
3916	+	while ((v = it.advance()) != null) {
3917	+	if ((u = searchFunction.apply(entryFor((K)it.nextKey, v))) != null)
3918	+	return u;
3919	+	}
3920	+	return null;
3921	+	}
3922	+
3923	+	/**
3924	+	* Returns the result of accumulating all entries using the
3925	+	* given reducer to combine values, or null if none.
3926	+	*
3927	+	* @param reducer a commutative associative combining function
3928	+	* @return the result of accumulating all entries
3929	+	*/
3930	+	@SuppressWarnings("unchecked") public Map.Entry<K,V> reduceEntriesSequentially
3931	+	(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
3932	+	if (reducer == null) throw new NullPointerException();
3933	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3934	+	Map.Entry<K,V> r = null; V v;
3935	+	while ((v = it.advance()) != null) {
3936	+	Map.Entry<K,V> u = entryFor((K)it.nextKey, v);
3937	+	r = (r == null) ? u : reducer.apply(r, u);
3938	+	}
3939	+	return r;
3940	+	}
3941	+
3942	+	/**
3943	+	* Returns the result of accumulating the given transformation
3944	+	* of all entries using the given reducer to combine values,
3945	+	* or null if none.
3946	+	*
3947	+	* @param transformer a function returning the transformation
3948	+	* for an element, or null of there is no transformation (in
3949	+	* which case it is not combined).
3950	+	* @param reducer a commutative associative combining function
3951	+	* @return the result of accumulating the given transformation
3952	+	* of all entries
3953	+	*/
3954	+	@SuppressWarnings("unchecked") public <U> U reduceEntriesSequentially
3955	+	(Fun<Map.Entry<K,V>, ? extends U> transformer,
3956	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3957	+	if (transformer == null || reducer == null)
3958	+	throw new NullPointerException();
3959	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3960	+	U r = null, u; V v;
3961	+	while ((v = it.advance()) != null) {
3962	+	if ((u = transformer.apply(entryFor((K)it.nextKey, v))) != null)
3963	+	r = (r == null) ? u : reducer.apply(r, u);
3964	+	}
3965	+	return r;
3966	+	}
3967	+
3968	+	/**
3969	+	* Returns the result of accumulating the given transformation
3970	+	* of all entries using the given reducer to combine values,
3971	+	* and the given basis as an identity value.
3972	+	*
3973	+	* @param transformer a function returning the transformation
3974	+	* for an element
3975	+	* @param basis the identity (initial default value) for the reduction
3976	+	* @param reducer a commutative associative combining function
3977	+	* @return the result of accumulating the given transformation
3978	+	* of all entries
3979	+	*/
3980	+	@SuppressWarnings("unchecked") public double reduceEntriesToDoubleSequentially
3981	+	(ObjectToDouble<Map.Entry<K,V>> transformer,
3982	+	double basis,
3983	+	DoubleByDoubleToDouble reducer) {
3984	+	if (transformer == null || reducer == null)
3985	+	throw new NullPointerException();
3986	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
3987	+	double r = basis; V v;
3988	+	while ((v = it.advance()) != null)
3989	+	r = reducer.apply(r, transformer.apply(entryFor((K)it.nextKey, v)));
3990	+	return r;
3991	+	}
3992	+
3993	+	/**
3994	+	* Returns the result of accumulating the given transformation
3995	+	* of all entries using the given reducer to combine values,
3996	+	* and the given basis as an identity value.
3997	+	*
3998	+	* @param transformer a function returning the transformation
3999	+	* for an element
4000	+	* @param basis the identity (initial default value) for the reduction
4001	+	* @param reducer a commutative associative combining function
4002	+	* @return  the result of accumulating the given transformation
4003	+	* of all entries
4004	+	*/
4005	+	@SuppressWarnings("unchecked") public long reduceEntriesToLongSequentially
4006	+	(ObjectToLong<Map.Entry<K,V>> transformer,
4007	+	long basis,
4008	+	LongByLongToLong reducer) {
4009	+	if (transformer == null || reducer == null)
4010	+	throw new NullPointerException();
4011	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4012	+	long r = basis; V v;
4013	+	while ((v = it.advance()) != null)
4014	+	r = reducer.apply(r, transformer.apply(entryFor((K)it.nextKey, v)));
4015	+	return r;
4016	+	}
4017	+
4018	+	/**
4019	+	* Returns the result of accumulating the given transformation
4020	+	* of all entries using the given reducer to combine values,
4021	+	* and the given basis as an identity value.
4022	+	*
4023	+	* @param transformer a function returning the transformation
4024	+	* for an element
4025	+	* @param basis the identity (initial default value) for the reduction
4026	+	* @param reducer a commutative associative combining function
4027	+	* @return the result of accumulating the given transformation
4028	+	* of all entries
4029	+	*/
4030	+	@SuppressWarnings("unchecked") public int reduceEntriesToIntSequentially
4031	+	(ObjectToInt<Map.Entry<K,V>> transformer,
4032	+	int basis,
4033	+	IntByIntToInt reducer) {
4034	+	if (transformer == null || reducer == null)
4035	+	throw new NullPointerException();
4036	+	Traverser<K,V,Object> it = new Traverser<K,V,Object>(this);
4037	+	int r = basis; V v;
4038	+	while ((v = it.advance()) != null)
4039	+	r = reducer.apply(r, transformer.apply(entryFor((K)it.nextKey, v)));
4040	+	return r;
4041	+	}
4042	+
4043	+	// Parallel bulk operations
4044	+
4045	+	/**
4046	+	* Performs the given action for each (key, value).
4047	+	*
4048	+	* @param action the action
4049	+	*/
4050	+	public void forEachInParallel(BiAction<K,V> action) {
4051	+	ForkJoinTasks.forEach
4052	+	(this, action).invoke();
4053	+	}
4054	+
4055	+	/**
4056	+	* Performs the given action for each non-null transformation
4057	+	* of each (key, value).
4058	+	*
4059	+	* @param transformer a function returning the transformation
4060	+	* for an element, or null of there is no transformation (in
4061	+	* which case the action is not applied).
4062	+	* @param action the action
4063	+	*/
4064	+	public <U> void forEachInParallel
4065	+	(BiFun<? super K, ? super V, ? extends U> transformer,
4066	+	Action<U> action) {
4067	+	ForkJoinTasks.forEach
4068	+	(this, transformer, action).invoke();
4069	+	}
4070	+
4071	+	/**
4072	+	* Returns a non-null result from applying the given search
4073	+	* function on each (key, value), or null if none.  Upon
4074	+	* success, further element processing is suppressed and the
4075	+	* results of any other parallel invocations of the search
4076	+	* function are ignored.
4077	+	*
4078	+	* @param searchFunction a function returning a non-null
4079	+	* result on success, else null
4080	+	* @return a non-null result from applying the given search
4081	+	* function on each (key, value), or null if none
4082	+	*/
4083	+	public <U> U searchInParallel
4084	+	(BiFun<? super K, ? super V, ? extends U> searchFunction) {
4085	+	return ForkJoinTasks.search
4086	+	(this, searchFunction).invoke();
4087	+	}
4088	+
4089	+	/**
4090	+	* Returns the result of accumulating the given transformation
4091	+	* of all (key, value) pairs using the given reducer to
4092	+	* combine values, or null if none.
4093	+	*
4094	+	* @param transformer a function returning the transformation
4095	+	* for an element, or null of there is no transformation (in
4096	+	* which case it is not combined).
4097	+	* @param reducer a commutative associative combining function
4098	+	* @return the result of accumulating the given transformation
4099	+	* of all (key, value) pairs
4100	+	*/
4101	+	public <U> U reduceInParallel
4102	+	(BiFun<? super K, ? super V, ? extends U> transformer,
4103	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4104	+	return ForkJoinTasks.reduce
4105	+	(this, transformer, reducer).invoke();
4106	+	}
4107	+
4108	+	/**
4109	+	* Returns the result of accumulating the given transformation
4110	+	* of all (key, value) pairs using the given reducer to
4111	+	* combine values, and the given basis as an identity value.
4112	+	*
4113	+	* @param transformer a function returning the transformation
4114	+	* for an element
4115	+	* @param basis the identity (initial default value) for the reduction
4116	+	* @param reducer a commutative associative combining function
4117	+	* @return the result of accumulating the given transformation
4118	+	* of all (key, value) pairs
4119	+	*/
4120	+	public double reduceToDoubleInParallel
4121	+	(ObjectByObjectToDouble<? super K, ? super V> transformer,
4122	+	double basis,
4123	+	DoubleByDoubleToDouble reducer) {
4124	+	return ForkJoinTasks.reduceToDouble
4125	+	(this, transformer, basis, reducer).invoke();
4126	+	}
4127	+
4128	+	/**
4129	+	* Returns the result of accumulating the given transformation
4130	+	* of all (key, value) pairs using the given reducer to
4131	+	* combine values, and the given basis as an identity value.
4132	+	*
4133	+	* @param transformer a function returning the transformation
4134	+	* for an element
4135	+	* @param basis the identity (initial default value) for the reduction
4136	+	* @param reducer a commutative associative combining function
4137	+	* @return the result of accumulating the given transformation
4138	+	* of all (key, value) pairs
4139	+	*/
4140	+	public long reduceToLongInParallel
4141	+	(ObjectByObjectToLong<? super K, ? super V> transformer,
4142	+	long basis,
4143	+	LongByLongToLong reducer) {
4144	+	return ForkJoinTasks.reduceToLong
4145	+	(this, transformer, basis, reducer).invoke();
4146	+	}
4147	+
4148	+	/**
4149	+	* Returns the result of accumulating the given transformation
4150	+	* of all (key, value) pairs using the given reducer to
4151	+	* combine values, and the given basis as an identity value.
4152	+	*
4153	+	* @param transformer a function returning the transformation
4154	+	* for an element
4155	+	* @param basis the identity (initial default value) for the reduction
4156	+	* @param reducer a commutative associative combining function
4157	+	* @return the result of accumulating the given transformation
4158	+	* of all (key, value) pairs
4159	+	*/
4160	+	public int reduceToIntInParallel
4161	+	(ObjectByObjectToInt<? super K, ? super V> transformer,
4162	+	int basis,
4163	+	IntByIntToInt reducer) {
4164	+	return ForkJoinTasks.reduceToInt
4165	+	(this, transformer, basis, reducer).invoke();
4166	+	}
4167	+
4168	+	/**
4169	+	* Performs the given action for each key.
4170	+	*
4171	+	* @param action the action
4172	+	*/
4173	+	public void forEachKeyInParallel(Action<K> action) {
4174	+	ForkJoinTasks.forEachKey
4175	+	(this, action).invoke();
4176	+	}
4177	+
4178	+	/**
4179	+	* Performs the given action for each non-null transformation
4180	+	* of each key.
4181	+	*
4182	+	* @param transformer a function returning the transformation
4183	+	* for an element, or null of there is no transformation (in
4184	+	* which case the action is not applied).
4185	+	* @param action the action
4186	+	*/
4187	+	public <U> void forEachKeyInParallel
4188	+	(Fun<? super K, ? extends U> transformer,
4189	+	Action<U> action) {
4190	+	ForkJoinTasks.forEachKey
4191	+	(this, transformer, action).invoke();
4192	+	}
4193	+
4194	+	/**
4195	+	* Returns a non-null result from applying the given search
4196	+	* function on each key, or null if none. Upon success,
4197	+	* further element processing is suppressed and the results of
4198	+	* any other parallel invocations of the search function are
4199	+	* ignored.
4200	+	*
4201	+	* @param searchFunction a function returning a non-null
4202	+	* result on success, else null
4203	+	* @return a non-null result from applying the given search
4204	+	* function on each key, or null if none
4205	+	*/
4206	+	public <U> U searchKeysInParallel
4207	+	(Fun<? super K, ? extends U> searchFunction) {
4208	+	return ForkJoinTasks.searchKeys
4209	+	(this, searchFunction).invoke();
4210	+	}
4211	+
4212	+	/**
4213	+	* Returns the result of accumulating all keys using the given
4214	+	* reducer to combine values, or null if none.
4215	+	*
4216	+	* @param reducer a commutative associative combining function
4217	+	* @return the result of accumulating all keys using the given
4218	+	* reducer to combine values, or null if none
4219	+	*/
4220	+	public K reduceKeysInParallel
4221	+	(BiFun<? super K, ? super K, ? extends K> reducer) {
4222	+	return ForkJoinTasks.reduceKeys
4223	+	(this, reducer).invoke();
4224	+	}
4225	+
4226	+	/**
4227	+	* Returns the result of accumulating the given transformation
4228	+	* of all keys using the given reducer to combine values, or
4229	+	* null if none.
4230	+	*
4231	+	* @param transformer a function returning the transformation
4232	+	* for an element, or null of there is no transformation (in
4233	+	* which case it is not combined).
4234	+	* @param reducer a commutative associative combining function
4235	+	* @return the result of accumulating the given transformation
4236	+	* of all keys
4237	+	*/
4238	+	public <U> U reduceKeysInParallel
4239	+	(Fun<? super K, ? extends U> transformer,
4240	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4241	+	return ForkJoinTasks.reduceKeys
4242	+	(this, transformer, reducer).invoke();
4243	+	}
4244	+
4245	+	/**
4246	+	* Returns the result of accumulating the given transformation
4247	+	* of all keys using the given reducer to combine values, and
4248	+	* the given basis as an identity value.
4249	+	*
4250	+	* @param transformer a function returning the transformation
4251	+	* for an element
4252	+	* @param basis the identity (initial default value) for the reduction
4253	+	* @param reducer a commutative associative combining function
4254	+	* @return  the result of accumulating the given transformation
4255	+	* of all keys
4256	+	*/
4257	+	public double reduceKeysToDoubleInParallel
4258	+	(ObjectToDouble<? super K> transformer,
4259	+	double basis,
4260	+	DoubleByDoubleToDouble reducer) {
4261	+	return ForkJoinTasks.reduceKeysToDouble
4262	+	(this, transformer, basis, reducer).invoke();
4263	+	}
4264	+
4265	+	/**
4266	+	* Returns the result of accumulating the given transformation
4267	+	* of all keys using the given reducer to combine values, and
4268	+	* the given basis as an identity value.
4269	+	*
4270	+	* @param transformer a function returning the transformation
4271	+	* for an element
4272	+	* @param basis the identity (initial default value) for the reduction
4273	+	* @param reducer a commutative associative combining function
4274	+	* @return the result of accumulating the given transformation
4275	+	* of all keys
4276	+	*/
4277	+	public long reduceKeysToLongInParallel
4278	+	(ObjectToLong<? super K> transformer,
4279	+	long basis,
4280	+	LongByLongToLong reducer) {
4281	+	return ForkJoinTasks.reduceKeysToLong
4282	+	(this, transformer, basis, reducer).invoke();
4283	+	}
4284	+
4285	+	/**
4286	+	* Returns the result of accumulating the given transformation
4287	+	* of all keys using the given reducer to combine values, and
4288	+	* the given basis as an identity value.
4289	+	*
4290	+	* @param transformer a function returning the transformation
4291	+	* for an element
4292	+	* @param basis the identity (initial default value) for the reduction
4293	+	* @param reducer a commutative associative combining function
4294	+	* @return the result of accumulating the given transformation
4295	+	* of all keys
4296	+	*/
4297	+	public int reduceKeysToIntInParallel
4298	+	(ObjectToInt<? super K> transformer,
4299	+	int basis,
4300	+	IntByIntToInt reducer) {
4301	+	return ForkJoinTasks.reduceKeysToInt
4302	+	(this, transformer, basis, reducer).invoke();
4303	+	}
4304	+
4305	+	/**
4306	+	* Performs the given action for each value.
4307	+	*
4308	+	* @param action the action
4309	+	*/
4310	+	public void forEachValueInParallel(Action<V> action) {
4311	+	ForkJoinTasks.forEachValue
4312	+	(this, action).invoke();
4313	+	}
4314	+
4315	+	/**
4316	+	* Performs the given action for each non-null transformation
4317	+	* of each value.
4318	+	*
4319	+	* @param transformer a function returning the transformation
4320	+	* for an element, or null of there is no transformation (in
4321	+	* which case the action is not applied).
4322	+	*/
4323	+	public <U> void forEachValueInParallel
4324	+	(Fun<? super V, ? extends U> transformer,
4325	+	Action<U> action) {
4326	+	ForkJoinTasks.forEachValue
4327	+	(this, transformer, action).invoke();
4328	+	}
4329	+
4330	+	/**
4331	+	* Returns a non-null result from applying the given search
4332	+	* function on each value, or null if none.  Upon success,
4333	+	* further element processing is suppressed and the results of
4334	+	* any other parallel invocations of the search function are
4335	+	* ignored.
4336	+	*
4337	+	* @param searchFunction a function returning a non-null
4338	+	* result on success, else null
4339	+	* @return a non-null result from applying the given search
4340	+	* function on each value, or null if none
4341	+	*/
4342	+	public <U> U searchValuesInParallel
4343	+	(Fun<? super V, ? extends U> searchFunction) {
4344	+	return ForkJoinTasks.searchValues
4345	+	(this, searchFunction).invoke();
4346	+	}
4347	+
4348	+	/**
4349	+	* Returns the result of accumulating all values using the
4350	+	* given reducer to combine values, or null if none.
4351	+	*
4352	+	* @param reducer a commutative associative combining function
4353	+	* @return  the result of accumulating all values
4354	+	*/
4355	+	public V reduceValuesInParallel
4356	+	(BiFun<? super V, ? super V, ? extends V> reducer) {
4357	+	return ForkJoinTasks.reduceValues
4358	+	(this, reducer).invoke();
4359	+	}
4360	+
4361	+	/**
4362	+	* Returns the result of accumulating the given transformation
4363	+	* of all values using the given reducer to combine values, or
4364	+	* null if none.
4365	+	*
4366	+	* @param transformer a function returning the transformation
4367	+	* for an element, or null of there is no transformation (in
4368	+	* which case it is not combined).
4369	+	* @param reducer a commutative associative combining function
4370	+	* @return the result of accumulating the given transformation
4371	+	* of all values
4372	+	*/
4373	+	public <U> U reduceValuesInParallel
4374	+	(Fun<? super V, ? extends U> transformer,
4375	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4376	+	return ForkJoinTasks.reduceValues
4377	+	(this, transformer, reducer).invoke();
4378	+	}
4379	+
4380	+	/**
4381	+	* Returns the result of accumulating the given transformation
4382	+	* of all values using the given reducer to combine values,
4383	+	* and the given basis as an identity value.
4384	+	*
4385	+	* @param transformer a function returning the transformation
4386	+	* for an element
4387	+	* @param basis the identity (initial default value) for the reduction
4388	+	* @param reducer a commutative associative combining function
4389	+	* @return the result of accumulating the given transformation
4390	+	* of all values
4391	+	*/
4392	+	public double reduceValuesToDoubleInParallel
4393	+	(ObjectToDouble<? super V> transformer,
4394	+	double basis,
4395	+	DoubleByDoubleToDouble reducer) {
4396	+	return ForkJoinTasks.reduceValuesToDouble
4397	+	(this, transformer, basis, reducer).invoke();
4398	+	}
4399	+
4400	+	/**
4401	+	* Returns the result of accumulating the given transformation
4402	+	* of all values using the given reducer to combine values,
4403	+	* and the given basis as an identity value.
4404	+	*
4405	+	* @param transformer a function returning the transformation
4406	+	* for an element
4407	+	* @param basis the identity (initial default value) for the reduction
4408	+	* @param reducer a commutative associative combining function
4409	+	* @return the result of accumulating the given transformation
4410	+	* of all values
4411	+	*/
4412	+	public long reduceValuesToLongInParallel
4413	+	(ObjectToLong<? super V> transformer,
4414	+	long basis,
4415	+	LongByLongToLong reducer) {
4416	+	return ForkJoinTasks.reduceValuesToLong
4417	+	(this, transformer, basis, reducer).invoke();
4418	+	}
4419	+
4420	+	/**
4421	+	* Returns the result of accumulating the given transformation
4422	+	* of all values using the given reducer to combine values,
4423	+	* and the given basis as an identity value.
4424	+	*
4425	+	* @param transformer a function returning the transformation
4426	+	* for an element
4427	+	* @param basis the identity (initial default value) for the reduction
4428	+	* @param reducer a commutative associative combining function
4429	+	* @return the result of accumulating the given transformation
4430	+	* of all values
4431	+	*/
4432	+	public int reduceValuesToIntInParallel
4433	+	(ObjectToInt<? super V> transformer,
4434	+	int basis,
4435	+	IntByIntToInt reducer) {
4436	+	return ForkJoinTasks.reduceValuesToInt
4437	+	(this, transformer, basis, reducer).invoke();
4438	+	}
4439	+
4440	+	/**
4441	+	* Performs the given action for each entry.
4442	+	*
4443	+	* @param action the action
4444	+	*/
4445	+	public void forEachEntryInParallel(Action<Map.Entry<K,V>> action) {
4446	+	ForkJoinTasks.forEachEntry
4447	+	(this, action).invoke();
4448	+	}
4449	+
4450	+	/**
4451	+	* Performs the given action for each non-null transformation
4452	+	* of each entry.
4453	+	*
4454	+	* @param transformer a function returning the transformation
4455	+	* for an element, or null of there is no transformation (in
4456	+	* which case the action is not applied).
4457	+	* @param action the action
4458	+	*/
4459	+	public <U> void forEachEntryInParallel
4460	+	(Fun<Map.Entry<K,V>, ? extends U> transformer,
4461	+	Action<U> action) {
4462	+	ForkJoinTasks.forEachEntry
4463	+	(this, transformer, action).invoke();
4464	+	}
4465	+
4466	+	/**
4467	+	* Returns a non-null result from applying the given search
4468	+	* function on each entry, or null if none.  Upon success,
4469	+	* further element processing is suppressed and the results of
4470	+	* any other parallel invocations of the search function are
4471	+	* ignored.
4472	+	*
4473	+	* @param searchFunction a function returning a non-null
4474	+	* result on success, else null
4475	+	* @return a non-null result from applying the given search
4476	+	* function on each entry, or null if none
4477	+	*/
4478	+	public <U> U searchEntriesInParallel
4479	+	(Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4480	+	return ForkJoinTasks.searchEntries
4481	+	(this, searchFunction).invoke();
4482	+	}
4483	+
4484	+	/**
4485	+	* Returns the result of accumulating all entries using the
4486	+	* given reducer to combine values, or null if none.
4487	+	*
4488	+	* @param reducer a commutative associative combining function
4489	+	* @return the result of accumulating all entries
4490	+	*/
4491	+	public Map.Entry<K,V> reduceEntriesInParallel
4492	+	(BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4493	+	return ForkJoinTasks.reduceEntries
4494	+	(this, reducer).invoke();
4495	+	}
4496	+
4497	+	/**
4498	+	* Returns the result of accumulating the given transformation
4499	+	* of all entries using the given reducer to combine values,
4500	+	* or null if none.
4501	+	*
4502	+	* @param transformer a function returning the transformation
4503	+	* for an element, or null of there is no transformation (in
4504	+	* which case it is not combined).
4505	+	* @param reducer a commutative associative combining function
4506	+	* @return the result of accumulating the given transformation
4507	+	* of all entries
4508	+	*/
4509	+	public <U> U reduceEntriesInParallel
4510	+	(Fun<Map.Entry<K,V>, ? extends U> transformer,
4511	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4512	+	return ForkJoinTasks.reduceEntries
4513	+	(this, transformer, reducer).invoke();
4514	+	}
4515	+
4516	+	/**
4517	+	* Returns the result of accumulating the given transformation
4518	+	* of all entries using the given reducer to combine values,
4519	+	* and the given basis as an identity value.
4520	+	*
4521	+	* @param transformer a function returning the transformation
4522	+	* for an element
4523	+	* @param basis the identity (initial default value) for the reduction
4524	+	* @param reducer a commutative associative combining function
4525	+	* @return the result of accumulating the given transformation
4526	+	* of all entries
4527	+	*/
4528	+	public double reduceEntriesToDoubleInParallel
4529	+	(ObjectToDouble<Map.Entry<K,V>> transformer,
4530	+	double basis,
4531	+	DoubleByDoubleToDouble reducer) {
4532	+	return ForkJoinTasks.reduceEntriesToDouble
4533	+	(this, transformer, basis, reducer).invoke();
4534	+	}
4535	+
4536	+	/**
4537	+	* Returns the result of accumulating the given transformation
4538	+	* of all entries using the given reducer to combine values,
4539	+	* and the given basis as an identity value.
4540	+	*
4541	+	* @param transformer a function returning the transformation
4542	+	* for an element
4543	+	* @param basis the identity (initial default value) for the reduction
4544	+	* @param reducer a commutative associative combining function
4545	+	* @return  the result of accumulating the given transformation
4546	+	* of all entries
4547	+	*/
4548	+	public long reduceEntriesToLongInParallel
4549	+	(ObjectToLong<Map.Entry<K,V>> transformer,
4550	+	long basis,
4551	+	LongByLongToLong reducer) {
4552	+	return ForkJoinTasks.reduceEntriesToLong
4553	+	(this, transformer, basis, reducer).invoke();
4554	+	}
4555	+
4556	+	/**
4557	+	* Returns the result of accumulating the given transformation
4558	+	* of all entries using the given reducer to combine values,
4559	+	* and the given basis as an identity value.
4560	+	*
4561	+	* @param transformer a function returning the transformation
4562	+	* for an element
4563	+	* @param basis the identity (initial default value) for the reduction
4564	+	* @param reducer a commutative associative combining function
4565	+	* @return the result of accumulating the given transformation
4566	+	* of all entries
4567	+	*/
4568	+	public int reduceEntriesToIntInParallel
4569	+	(ObjectToInt<Map.Entry<K,V>> transformer,
4570	+	int basis,
4571	+	IntByIntToInt reducer) {
4572	+	return ForkJoinTasks.reduceEntriesToInt
4573	+	(this, transformer, basis, reducer).invoke();
4574	+	}
4575	+
4576	+
4577	+	/* ----------------Views -------------- */
4578	+
4579	+	/**
4580	+	* Base class for views.
4581	+	*/
4582	+	abstract static class CHMView<K, V> {
4583	+	final ConcurrentHashMapV8<K, V> map;
4584	+	CHMView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
4585	+
4586	+	/**
4587	+	* Returns the map backing this view.
4588	+	*
4589	+	* @return the map backing this view
4590	+	*/
4591	+	public ConcurrentHashMapV8<K,V> getMap() { return map; }
4592	+
4593	+	public final int size()                 { return map.size(); }
4594	+	public final boolean isEmpty()          { return map.isEmpty(); }
4595	+	public final void clear()               { map.clear(); }
4596	+
4597	+	// implementations below rely on concrete classes supplying these
4598	+	public abstract Iterator<?> iterator();
4599	+	public abstract boolean contains(Object o);
4600	+	public abstract boolean remove(Object o);
4601	+
4602	+	private static final String oomeMsg = "Required array size too large";
4603	+
4604	+	public final Object[] toArray() {
4605	+	long sz = map.mappingCount();
4606	+	if (sz > (long)(MAX_ARRAY_SIZE))
4607	+	throw new OutOfMemoryError(oomeMsg);
4608	+	int n = (int)sz;
4609	+	Object[] r = new Object[n];
4610	+	int i = 0;
4611	+	Iterator<?> it = iterator();
4612	+	while (it.hasNext()) {
4613	+	if (i == n) {
4614	+	if (n >= MAX_ARRAY_SIZE)
4615	+	throw new OutOfMemoryError(oomeMsg);
4616	+	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
4617	+	n = MAX_ARRAY_SIZE;
4618	+	else
4619	+	n += (n >>> 1) + 1;
4620	+	r = Arrays.copyOf(r, n);
4621	+	}
4622	+	r[i++] = it.next();
4623	+	}
4624	+	return (i == n) ? r : Arrays.copyOf(r, i);
4625	+	}
4626	+
4627	+	@SuppressWarnings("unchecked") public final <T> T[] toArray(T[] a) {
4628	+	long sz = map.mappingCount();
4629	+	if (sz > (long)(MAX_ARRAY_SIZE))
4630	+	throw new OutOfMemoryError(oomeMsg);
4631	+	int m = (int)sz;
4632	+	T[] r = (a.length >= m) ? a :
4633	+	(T[])java.lang.reflect.Array
4634	+	.newInstance(a.getClass().getComponentType(), m);
4635	+	int n = r.length;
4636	+	int i = 0;
4637	+	Iterator<?> it = iterator();
4638	+	while (it.hasNext()) {
4639	+	if (i == n) {
4640	+	if (n >= MAX_ARRAY_SIZE)
4641	+	throw new OutOfMemoryError(oomeMsg);
4642	+	if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1)
4643	+	n = MAX_ARRAY_SIZE;
4644	+	else
4645	+	n += (n >>> 1) + 1;
4646	+	r = Arrays.copyOf(r, n);
4647	+	}
4648	+	r[i++] = (T)it.next();
4649	+	}
4650	+	if (a == r && i < n) {
4651	+	r[i] = null; // null-terminate
4652	+	return r;
4653	+	}
4654	+	return (i == n) ? r : Arrays.copyOf(r, i);
4655	+	}
4656	+
4657	+	public final int hashCode() {
4658	+	int h = 0;
4659	+	for (Iterator<?> it = iterator(); it.hasNext();)
4660	+	h += it.next().hashCode();
4661	+	return h;
4662	+	}
4663	+
4664	+	public final String toString() {
4665	+	StringBuilder sb = new StringBuilder();
4666	+	sb.append('[');
4667	+	Iterator<?> it = iterator();
4668	+	if (it.hasNext()) {
4669	+	for (;;) {
4670	+	Object e = it.next();
4671	+	sb.append(e == this ? "(this Collection)" : e);
4672	+	if (!it.hasNext())
4673	+	break;
4674	+	sb.append(',').append(' ');
4675	+	}
4676	+	}
4677	+	return sb.append(']').toString();
4678	+	}
4679	+
4680	+	public final boolean containsAll(Collection<?> c) {
4681	+	if (c != this) {
4682	+	for (Iterator<?> it = c.iterator(); it.hasNext();) {
4683	+	Object e = it.next();
4684	+	if (e == null || !contains(e))
4685	+	return false;
4686	+	}
4687	+	}
4688	+	return true;
4689	+	}
4690	+
4691	+	public final boolean removeAll(Collection<?> c) {
4692	+	boolean modified = false;
4693	+	for (Iterator<?> it = iterator(); it.hasNext();) {
4694	+	if (c.contains(it.next())) {
4695	+	it.remove();
4696	+	modified = true;
4697	+	}
4698	+	}
4699	+	return modified;
4700	+	}
4701	+
4702	+	public final boolean retainAll(Collection<?> c) {
4703	+	boolean modified = false;
4704	+	for (Iterator<?> it = iterator(); it.hasNext();) {
4705	+	if (!c.contains(it.next())) {
4706	+	it.remove();
4707	+	modified = true;
4708	+	}
4709	+	}
4710	+	return modified;
4711	+	}
4712	+
4713	+	}
4714	+
4715	+	/**
4716	+	* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4717	+	* which additions may optionally be enabled by mapping to a
4718	+	* common value.  This class cannot be directly instantiated. See
4719	+	* {@link #keySet}, {@link #keySet(Object)}, {@link #newKeySet()},
4720	+	* {@link #newKeySet(int)}.
4721	+	*/
4722	+	public static class KeySetView<K,V> extends CHMView<K,V>
4723	+	implements Set<K>, java.io.Serializable {
4724	+	private static final long serialVersionUID = 7249069246763182397L;
4725	+	private final V value;
4726	+	KeySetView(ConcurrentHashMapV8<K, V> map, V value) {  // non-public
4727	+	super(map);
4728	+	this.value = value;
4729	+	}
4730	+
4731	+	/**
4732	+	* Returns the default mapped value for additions,
4733	+	* or {@code null} if additions are not supported.
4734	+	*
4735	+	* @return the default mapped value for additions, or {@code null}
4736	+	* if not supported.
4737	+	*/
4738	+	public V getMappedValue() { return value; }
4739	+
4740	+	// implement Set API
4741	+
4742	+	public boolean contains(Object o) { return map.containsKey(o); }
4743	+	public boolean remove(Object o)   { return map.remove(o) != null; }
4744	+
4745	+	/**
4746	+	* Returns a "weakly consistent" iterator that will never
4747	+	* throw {@link ConcurrentModificationException}, and
4748	+	* guarantees to traverse elements as they existed upon
4749	+	* construction of the iterator, and may (but is not
4750	+	* guaranteed to) reflect any modifications subsequent to
4751	+	* construction.
4752	+	*
4753	+	* @return an iterator over the keys of this map
4754	+	*/
4755	+	public Iterator<K> iterator()     { return new KeyIterator<K,V>(map); }
4756	+	public boolean add(K e) {
4757	+	V v;
4758	+	if ((v = value) == null)
4759	+	throw new UnsupportedOperationException();
4760	+	if (e == null)
4761	+	throw new NullPointerException();
4762	+	return map.internalPut(e, v, true) == null;
4763	+	}
4764	+	public boolean addAll(Collection<? extends K> c) {
4765	+	boolean added = false;
4766	+	V v;
4767	+	if ((v = value) == null)
4768	+	throw new UnsupportedOperationException();
4769	+	for (K e : c) {
4770	+	if (e == null)
4771	+	throw new NullPointerException();
4772	+	if (map.internalPut(e, v, true) == null)
4773	+	added = true;
4774	+	}
4775	+	return added;
4776	+	}
4777	+	public boolean equals(Object o) {
4778	+	Set<?> c;
4779	+	return ((o instanceof Set) &&
4780	+	((c = (Set<?>)o) == this ||
4781	+	(containsAll(c) && c.containsAll(this))));
4782	+	}
4783	+	}
4784	+
4785	+	/**
4786	+	* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4787	+	* values, in which additions are disabled. This class cannot be
4788	+	* directly instantiated. See {@link #values},
4789	+	*
4790	+	* <p>The view's {@code iterator} is a "weakly consistent" iterator
4791	+	* that will never throw {@link ConcurrentModificationException},
4792	+	* and guarantees to traverse elements as they existed upon
4793	+	* construction of the iterator, and may (but is not guaranteed to)
4794	+	* reflect any modifications subsequent to construction.
4795	+	*/
4796	+	public static final class ValuesView<K,V> extends CHMView<K,V>
4797	+	implements Collection<V> {
4798	+	ValuesView(ConcurrentHashMapV8<K, V> map)   { super(map); }
4799	+	public final boolean contains(Object o) { return map.containsValue(o); }
4800	+	public final boolean remove(Object o) {
4801	+	if (o != null) {
4802	+	Iterator<V> it = new ValueIterator<K,V>(map);
4803	+	while (it.hasNext()) {
4804	+	if (o.equals(it.next())) {
4805	+	it.remove();
4806	+	return true;
4807	+	}
4808	+	}
4809	+	}
4810	+	return false;
4811	+	}
4812	+
4813	+	/**
4814	+	* Returns a "weakly consistent" iterator that will never
4815	+	* throw {@link ConcurrentModificationException}, and
4816	+	* guarantees to traverse elements as they existed upon
4817	+	* construction of the iterator, and may (but is not
4818	+	* guaranteed to) reflect any modifications subsequent to
4819	+	* construction.
4820	+	*
4821	+	* @return an iterator over the values of this map
4822	+	*/
4823	+	public final Iterator<V> iterator() {
4824	+	return new ValueIterator<K,V>(map);
4825	+	}
4826	+	public final boolean add(V e) {
4827	+	throw new UnsupportedOperationException();
4828	+	}
4829	+	public final boolean addAll(Collection<? extends V> c) {
4830	+	throw new UnsupportedOperationException();
4831	+	}
4832	+
4833	+	}
4834	+
4835	+	/**
4836	+	* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4837	+	* entries.  This class cannot be directly instantiated. See
4838	+	* {@link #entrySet}.
4839	+	*/
4840	+	public static final class EntrySetView<K,V> extends CHMView<K,V>
4841	+	implements Set<Map.Entry<K,V>> {
4842	+	EntrySetView(ConcurrentHashMapV8<K, V> map) { super(map); }
4843	+	public final boolean contains(Object o) {
4844	+	Object k, v, r; Map.Entry<?,?> e;
4845	+	return ((o instanceof Map.Entry) &&
4846	+	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
4847	+	(r = map.get(k)) != null &&
4848	+	(v = e.getValue()) != null &&
4849	+	(v == r || v.equals(r)));
4850	+	}
4851	+	public final boolean remove(Object o) {
4852	+	Object k, v; Map.Entry<?,?> e;
4853	+	return ((o instanceof Map.Entry) &&
4854	+	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
4855	+	(v = e.getValue()) != null &&
4856	+	map.remove(k, v));
4857	+	}
4858	+
4859	+	/**
4860	+	* Returns a "weakly consistent" iterator that will never
4861	+	* throw {@link ConcurrentModificationException}, and
4862	+	* guarantees to traverse elements as they existed upon
4863	+	* construction of the iterator, and may (but is not
4864	+	* guaranteed to) reflect any modifications subsequent to
4865	+	* construction.
4866	+	*
4867	+	* @return an iterator over the entries of this map
4868	+	*/
4869	+	public final Iterator<Map.Entry<K,V>> iterator() {
4870	+	return new EntryIterator<K,V>(map);
4871	+	}
4872	+
4873	+	public final boolean add(Entry<K,V> e) {
4874	+	K key = e.getKey();
4875	+	V value = e.getValue();
4876	+	if (key == null || value == null)
4877	+	throw new NullPointerException();
4878	+	return map.internalPut(key, value, false) == null;
4879	+	}
4880	+	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4881	+	boolean added = false;
4882	+	for (Entry<K,V> e : c) {
4883	+	if (add(e))
4884	+	added = true;
4885	+	}
4886	+	return added;
4887	+	}
4888	+	public boolean equals(Object o) {
4889	+	Set<?> c;
4890	+	return ((o instanceof Set) &&
4891	+	((c = (Set<?>)o) == this ||
4892	+	(containsAll(c) && c.containsAll(this))));
4893	+	}
4894	+	}
4895	+
4896	+	// ---------------------------------------------------------------------
4897	+
4898	+	/**
4899	+	* Predefined tasks for performing bulk parallel operations on
4900	+	* ConcurrentHashMapV8s. These tasks follow the forms and rules used
4901	+	* for bulk operations. Each method has the same name, but returns
4902	+	* a task rather than invoking it. These methods may be useful in
4903	+	* custom applications such as submitting a task without waiting
4904	+	* for completion, using a custom pool, or combining with other
4905	+	* tasks.
4906	+	*/
4907	+	public static class ForkJoinTasks {
4908	+	private ForkJoinTasks() {}
4909	+
4910	+	/**
4911	+	* Returns a task that when invoked, performs the given
4912	+	* action for each (key, value)
4913	+	*
4914	+	* @param map the map
4915	+	* @param action the action
4916	+	* @return the task
4917	+	*/
4918	+	public static <K,V> ForkJoinTask<Void> forEach
4919	+	(ConcurrentHashMapV8<K,V> map,
4920	+	BiAction<K,V> action) {
4921	+	if (action == null) throw new NullPointerException();
4922	+	return new ForEachMappingTask<K,V>(map, null, -1, action);
4923	+	}
4924	+
4925	+	/**
4926	+	* Returns a task that when invoked, performs the given
4927	+	* action for each non-null transformation of each (key, value)
4928	+	*
4929	+	* @param map the map
4930	+	* @param transformer a function returning the transformation
4931	+	* for an element, or null if there is no transformation (in
4932	+	* which case the action is not applied)
4933	+	* @param action the action
4934	+	* @return the task
4935	+	*/
4936	+	public static <K,V,U> ForkJoinTask<Void> forEach
4937	+	(ConcurrentHashMapV8<K,V> map,
4938	+	BiFun<? super K, ? super V, ? extends U> transformer,
4939	+	Action<U> action) {
4940	+	if (transformer == null || action == null)
4941	+	throw new NullPointerException();
4942	+	return new ForEachTransformedMappingTask<K,V,U>
4943	+	(map, null, -1, transformer, action);
4944	+	}
4945	+
4946	+	/**
4947	+	* Returns a task that when invoked, returns a non-null result
4948	+	* from applying the given search function on each (key,
4949	+	* value), or null if none. Upon success, further element
4950	+	* processing is suppressed and the results of any other
4951	+	* parallel invocations of the search function are ignored.
4952	+	*
4953	+	* @param map the map
4954	+	* @param searchFunction a function returning a non-null
4955	+	* result on success, else null
4956	+	* @return the task
4957	+	*/
4958	+	public static <K,V,U> ForkJoinTask<U> search
4959	+	(ConcurrentHashMapV8<K,V> map,
4960	+	BiFun<? super K, ? super V, ? extends U> searchFunction) {
4961	+	if (searchFunction == null) throw new NullPointerException();
4962	+	return new SearchMappingsTask<K,V,U>
4963	+	(map, null, -1, searchFunction,
4964	+	new AtomicReference<U>());
4965	+	}
4966	+
4967	+	/**
4968	+	* Returns a task that when invoked, returns the result of
4969	+	* accumulating the given transformation of all (key, value) pairs
4970	+	* using the given reducer to combine values, or null if none.
4971	+	*
4972	+	* @param map the map
4973	+	* @param transformer a function returning the transformation
4974	+	* for an element, or null if there is no transformation (in
4975	+	* which case it is not combined).
4976	+	* @param reducer a commutative associative combining function
4977	+	* @return the task
4978	+	*/
4979	+	public static <K,V,U> ForkJoinTask<U> reduce
4980	+	(ConcurrentHashMapV8<K,V> map,
4981	+	BiFun<? super K, ? super V, ? extends U> transformer,
4982	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4983	+	if (transformer == null || reducer == null)
4984	+	throw new NullPointerException();
4985	+	return new MapReduceMappingsTask<K,V,U>
4986	+	(map, null, -1, null, transformer, reducer);
4987	+	}
4988	+
4989	+	/**
4990	+	* Returns a task that when invoked, returns the result of
4991	+	* accumulating the given transformation of all (key, value) pairs
4992	+	* using the given reducer to combine values, and the given
4993	+	* basis as an identity value.
4994	+	*
4995	+	* @param map the map
4996	+	* @param transformer a function returning the transformation
4997	+	* for an element
4998	+	* @param basis the identity (initial default value) for the reduction
4999	+	* @param reducer a commutative associative combining function
5000	+	* @return the task
5001	+	*/
5002	+	public static <K,V> ForkJoinTask<Double> reduceToDouble
5003	+	(ConcurrentHashMapV8<K,V> map,
5004	+	ObjectByObjectToDouble<? super K, ? super V> transformer,
5005	+	double basis,
5006	+	DoubleByDoubleToDouble reducer) {
5007	+	if (transformer == null || reducer == null)
5008	+	throw new NullPointerException();
5009	+	return new MapReduceMappingsToDoubleTask<K,V>
5010	+	(map, null, -1, null, transformer, basis, reducer);
5011	+	}
5012	+
5013	+	/**
5014	+	* Returns a task that when invoked, returns the result of
5015	+	* accumulating the given transformation of all (key, value) pairs
5016	+	* using the given reducer to combine values, and the given
5017	+	* basis as an identity value.
5018	+	*
5019	+	* @param map the map
5020	+	* @param transformer a function returning the transformation
5021	+	* for an element
5022	+	* @param basis the identity (initial default value) for the reduction
5023	+	* @param reducer a commutative associative combining function
5024	+	* @return the task
5025	+	*/
5026	+	public static <K,V> ForkJoinTask<Long> reduceToLong
5027	+	(ConcurrentHashMapV8<K,V> map,
5028	+	ObjectByObjectToLong<? super K, ? super V> transformer,
5029	+	long basis,
5030	+	LongByLongToLong reducer) {
5031	+	if (transformer == null || reducer == null)
5032	+	throw new NullPointerException();
5033	+	return new MapReduceMappingsToLongTask<K,V>
5034	+	(map, null, -1, null, transformer, basis, reducer);
5035	+	}
5036	+
5037	+	/**
5038	+	* Returns a task that when invoked, returns the result of
5039	+	* accumulating the given transformation of all (key, value) pairs
5040	+	* using the given reducer to combine values, and the given
5041	+	* basis as an identity value.
5042	+	*
5043	+	* @param transformer a function returning the transformation
5044	+	* for an element
5045	+	* @param basis the identity (initial default value) for the reduction
5046	+	* @param reducer a commutative associative combining function
5047	+	* @return the task
5048	+	*/
5049	+	public static <K,V> ForkJoinTask<Integer> reduceToInt
5050	+	(ConcurrentHashMapV8<K,V> map,
5051	+	ObjectByObjectToInt<? super K, ? super V> transformer,
5052	+	int basis,
5053	+	IntByIntToInt reducer) {
5054	+	if (transformer == null || reducer == null)
5055	+	throw new NullPointerException();
5056	+	return new MapReduceMappingsToIntTask<K,V>
5057	+	(map, null, -1, null, transformer, basis, reducer);
5058	+	}
5059	+
5060	+	/**
5061	+	* Returns a task that when invoked, performs the given action
5062	+	* for each key.
5063	+	*
5064	+	* @param map the map
5065	+	* @param action the action
5066	+	* @return the task
5067	+	*/
5068	+	public static <K,V> ForkJoinTask<Void> forEachKey
5069	+	(ConcurrentHashMapV8<K,V> map,
5070	+	Action<K> action) {
5071	+	if (action == null) throw new NullPointerException();
5072	+	return new ForEachKeyTask<K,V>(map, null, -1, action);
5073	+	}
5074	+
5075	+	/**
5076	+	* Returns a task that when invoked, performs the given action
5077	+	* for each non-null transformation of each key.
5078	+	*
5079	+	* @param map the map
5080	+	* @param transformer a function returning the transformation
5081	+	* for an element, or null if there is no transformation (in
5082	+	* which case the action is not applied)
5083	+	* @param action the action
5084	+	* @return the task
5085	+	*/
5086	+	public static <K,V,U> ForkJoinTask<Void> forEachKey
5087	+	(ConcurrentHashMapV8<K,V> map,
5088	+	Fun<? super K, ? extends U> transformer,
5089	+	Action<U> action) {
5090	+	if (transformer == null || action == null)
5091	+	throw new NullPointerException();
5092	+	return new ForEachTransformedKeyTask<K,V,U>
5093	+	(map, null, -1, transformer, action);
5094	+	}
5095	+
5096	+	/**
5097	+	* Returns a task that when invoked, returns a non-null result
5098	+	* from applying the given search function on each key, or
5099	+	* null if none.  Upon success, further element processing is
5100	+	* suppressed and the results of any other parallel
5101	+	* invocations of the search function are ignored.
5102	+	*
5103	+	* @param map the map
5104	+	* @param searchFunction a function returning a non-null
5105	+	* result on success, else null
5106	+	* @return the task
5107	+	*/
5108	+	public static <K,V,U> ForkJoinTask<U> searchKeys
5109	+	(ConcurrentHashMapV8<K,V> map,
5110	+	Fun<? super K, ? extends U> searchFunction) {
5111	+	if (searchFunction == null) throw new NullPointerException();
5112	+	return new SearchKeysTask<K,V,U>
5113	+	(map, null, -1, searchFunction,
5114	+	new AtomicReference<U>());
5115	+	}
5116	+
5117	+	/**
5118	+	* Returns a task that when invoked, returns the result of
5119	+	* accumulating all keys using the given reducer to combine
5120	+	* values, or null if none.
5121	+	*
5122	+	* @param map the map
5123	+	* @param reducer a commutative associative combining function
5124	+	* @return the task
5125	+	*/
5126	+	public static <K,V> ForkJoinTask<K> reduceKeys
5127	+	(ConcurrentHashMapV8<K,V> map,
5128	+	BiFun<? super K, ? super K, ? extends K> reducer) {
5129	+	if (reducer == null) throw new NullPointerException();
5130	+	return new ReduceKeysTask<K,V>
5131	+	(map, null, -1, null, reducer);
5132	+	}
5133	+
5134	+	/**
5135	+	* Returns a task that when invoked, returns the result of
5136	+	* accumulating the given transformation of all keys using the given
5137	+	* reducer to combine values, or null if none.
5138	+	*
5139	+	* @param map the map
5140	+	* @param transformer a function returning the transformation
5141	+	* for an element, or null if there is no transformation (in
5142	+	* which case it is not combined).
5143	+	* @param reducer a commutative associative combining function
5144	+	* @return the task
5145	+	*/
5146	+	public static <K,V,U> ForkJoinTask<U> reduceKeys
5147	+	(ConcurrentHashMapV8<K,V> map,
5148	+	Fun<? super K, ? extends U> transformer,
5149	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5150	+	if (transformer == null || reducer == null)
5151	+	throw new NullPointerException();
5152	+	return new MapReduceKeysTask<K,V,U>
5153	+	(map, null, -1, null, transformer, reducer);
5154	+	}
5155	+
5156	+	/**
5157	+	* Returns a task that when invoked, returns the result of
5158	+	* accumulating the given transformation of all keys using the given
5159	+	* reducer to combine values, and the given basis as an
5160	+	* identity value.
5161	+	*
5162	+	* @param map the map
5163	+	* @param transformer a function returning the transformation
5164	+	* for an element
5165	+	* @param basis the identity (initial default value) for the reduction
5166	+	* @param reducer a commutative associative combining function
5167	+	* @return the task
5168	+	*/
5169	+	public static <K,V> ForkJoinTask<Double> reduceKeysToDouble
5170	+	(ConcurrentHashMapV8<K,V> map,
5171	+	ObjectToDouble<? super K> transformer,
5172	+	double basis,
5173	+	DoubleByDoubleToDouble reducer) {
5174	+	if (transformer == null || reducer == null)
5175	+	throw new NullPointerException();
5176	+	return new MapReduceKeysToDoubleTask<K,V>
5177	+	(map, null, -1, null, transformer, basis, reducer);
5178	+	}
5179	+
5180	+	/**
5181	+	* Returns a task that when invoked, returns the result of
5182	+	* accumulating the given transformation of all keys using the given
5183	+	* reducer to combine values, and the given basis as an
5184	+	* identity value.
5185	+	*
5186	+	* @param map the map
5187	+	* @param transformer a function returning the transformation
5188	+	* for an element
5189	+	* @param basis the identity (initial default value) for the reduction
5190	+	* @param reducer a commutative associative combining function
5191	+	* @return the task
5192	+	*/
5193	+	public static <K,V> ForkJoinTask<Long> reduceKeysToLong
5194	+	(ConcurrentHashMapV8<K,V> map,
5195	+	ObjectToLong<? super K> transformer,
5196	+	long basis,
5197	+	LongByLongToLong reducer) {
5198	+	if (transformer == null || reducer == null)
5199	+	throw new NullPointerException();
5200	+	return new MapReduceKeysToLongTask<K,V>
5201	+	(map, null, -1, null, transformer, basis, reducer);
5202	+	}
5203	+
5204	+	/**
5205	+	* Returns a task that when invoked, returns the result of
5206	+	* accumulating the given transformation of all keys using the given
5207	+	* reducer to combine values, and the given basis as an
5208	+	* identity value.
5209	+	*
5210	+	* @param map the map
5211	+	* @param transformer a function returning the transformation
5212	+	* for an element
5213	+	* @param basis the identity (initial default value) for the reduction
5214	+	* @param reducer a commutative associative combining function
5215	+	* @return the task
5216	+	*/
5217	+	public static <K,V> ForkJoinTask<Integer> reduceKeysToInt
5218	+	(ConcurrentHashMapV8<K,V> map,
5219	+	ObjectToInt<? super K> transformer,
5220	+	int basis,
5221	+	IntByIntToInt reducer) {
5222	+	if (transformer == null || reducer == null)
5223	+	throw new NullPointerException();
5224	+	return new MapReduceKeysToIntTask<K,V>
5225	+	(map, null, -1, null, transformer, basis, reducer);
5226	+	}
5227	+
5228	+	/**
5229	+	* Returns a task that when invoked, performs the given action
5230	+	* for each value.
5231	+	*
5232	+	* @param map the map
5233	+	* @param action the action
5234	+	*/
5235	+	public static <K,V> ForkJoinTask<Void> forEachValue
5236	+	(ConcurrentHashMapV8<K,V> map,
5237	+	Action<V> action) {
5238	+	if (action == null) throw new NullPointerException();
5239	+	return new ForEachValueTask<K,V>(map, null, -1, action);
5240	+	}
5241	+
5242	+	/**
5243	+	* Returns a task that when invoked, performs the given action
5244	+	* for each non-null transformation of each value.
5245	+	*
5246	+	* @param map the map
5247	+	* @param transformer a function returning the transformation
5248	+	* for an element, or null if there is no transformation (in
5249	+	* which case the action is not applied)
5250	+	* @param action the action
5251	+	*/
5252	+	public static <K,V,U> ForkJoinTask<Void> forEachValue
5253	+	(ConcurrentHashMapV8<K,V> map,
5254	+	Fun<? super V, ? extends U> transformer,
5255	+	Action<U> action) {
5256	+	if (transformer == null || action == null)
5257	+	throw new NullPointerException();
5258	+	return new ForEachTransformedValueTask<K,V,U>
5259	+	(map, null, -1, transformer, action);
5260	+	}
5261	+
5262	+	/**
5263	+	* Returns a task that when invoked, returns a non-null result
5264	+	* from applying the given search function on each value, or
5265	+	* null if none.  Upon success, further element processing is
5266	+	* suppressed and the results of any other parallel
5267	+	* invocations of the search function are ignored.
5268	+	*
5269	+	* @param map the map
5270	+	* @param searchFunction a function returning a non-null
5271	+	* result on success, else null
5272	+	* @return the task
5273	+	*/
5274	+	public static <K,V,U> ForkJoinTask<U> searchValues
5275	+	(ConcurrentHashMapV8<K,V> map,
5276	+	Fun<? super V, ? extends U> searchFunction) {
5277	+	if (searchFunction == null) throw new NullPointerException();
5278	+	return new SearchValuesTask<K,V,U>
5279	+	(map, null, -1, searchFunction,
5280	+	new AtomicReference<U>());
5281	+	}
5282	+
5283	+	/**
5284	+	* Returns a task that when invoked, returns the result of
5285	+	* accumulating all values using the given reducer to combine
5286	+	* values, or null if none.
5287	+	*
5288	+	* @param map the map
5289	+	* @param reducer a commutative associative combining function
5290	+	* @return the task
5291	+	*/
5292	+	public static <K,V> ForkJoinTask<V> reduceValues
5293	+	(ConcurrentHashMapV8<K,V> map,
5294	+	BiFun<? super V, ? super V, ? extends V> reducer) {
5295	+	if (reducer == null) throw new NullPointerException();
5296	+	return new ReduceValuesTask<K,V>
5297	+	(map, null, -1, null, reducer);
5298	+	}
5299	+
5300	+	/**
5301	+	* Returns a task that when invoked, returns the result of
5302	+	* accumulating the given transformation of all values using the
5303	+	* given reducer to combine values, or null if none.
5304	+	*
5305	+	* @param map the map
5306	+	* @param transformer a function returning the transformation
5307	+	* for an element, or null if there is no transformation (in
5308	+	* which case it is not combined).
5309	+	* @param reducer a commutative associative combining function
5310	+	* @return the task
5311	+	*/
5312	+	public static <K,V,U> ForkJoinTask<U> reduceValues
5313	+	(ConcurrentHashMapV8<K,V> map,
5314	+	Fun<? super V, ? extends U> transformer,
5315	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5316	+	if (transformer == null || reducer == null)
5317	+	throw new NullPointerException();
5318	+	return new MapReduceValuesTask<K,V,U>
5319	+	(map, null, -1, null, transformer, reducer);
5320	+	}
5321	+
5322	+	/**
5323	+	* Returns a task that when invoked, returns the result of
5324	+	* accumulating the given transformation of all values using the
5325	+	* given reducer to combine values, and the given basis as an
5326	+	* identity value.
5327	+	*
5328	+	* @param map the map
5329	+	* @param transformer a function returning the transformation
5330	+	* for an element
5331	+	* @param basis the identity (initial default value) for the reduction
5332	+	* @param reducer a commutative associative combining function
5333	+	* @return the task
5334	+	*/
5335	+	public static <K,V> ForkJoinTask<Double> reduceValuesToDouble
5336	+	(ConcurrentHashMapV8<K,V> map,
5337	+	ObjectToDouble<? super V> transformer,
5338	+	double basis,
5339	+	DoubleByDoubleToDouble reducer) {
5340	+	if (transformer == null || reducer == null)
5341	+	throw new NullPointerException();
5342	+	return new MapReduceValuesToDoubleTask<K,V>
5343	+	(map, null, -1, null, transformer, basis, reducer);
5344	+	}
5345	+
5346	+	/**
5347	+	* Returns a task that when invoked, returns the result of
5348	+	* accumulating the given transformation of all values using the
5349	+	* given reducer to combine values, and the given basis as an
5350	+	* identity value.
5351	+	*
5352	+	* @param map the map
5353	+	* @param transformer a function returning the transformation
5354	+	* for an element
5355	+	* @param basis the identity (initial default value) for the reduction
5356	+	* @param reducer a commutative associative combining function
5357	+	* @return the task
5358	+	*/
5359	+	public static <K,V> ForkJoinTask<Long> reduceValuesToLong
5360	+	(ConcurrentHashMapV8<K,V> map,
5361	+	ObjectToLong<? super V> transformer,
5362	+	long basis,
5363	+	LongByLongToLong reducer) {
5364	+	if (transformer == null || reducer == null)
5365	+	throw new NullPointerException();
5366	+	return new MapReduceValuesToLongTask<K,V>
5367	+	(map, null, -1, null, transformer, basis, reducer);
5368	+	}
5369	+
5370	+	/**
5371	+	* Returns a task that when invoked, returns the result of
5372	+	* accumulating the given transformation of all values using the
5373	+	* given reducer to combine values, and the given basis as an
5374	+	* identity value.
5375	+	*
5376	+	* @param map the map
5377	+	* @param transformer a function returning the transformation
5378	+	* for an element
5379	+	* @param basis the identity (initial default value) for the reduction
5380	+	* @param reducer a commutative associative combining function
5381	+	* @return the task
5382	+	*/
5383	+	public static <K,V> ForkJoinTask<Integer> reduceValuesToInt
5384	+	(ConcurrentHashMapV8<K,V> map,
5385	+	ObjectToInt<? super V> transformer,
5386	+	int basis,
5387	+	IntByIntToInt reducer) {
5388	+	if (transformer == null || reducer == null)
5389	+	throw new NullPointerException();
5390	+	return new MapReduceValuesToIntTask<K,V>
5391	+	(map, null, -1, null, transformer, basis, reducer);
5392	+	}
5393	+
5394	+	/**
5395	+	* Returns a task that when invoked, perform the given action
5396	+	* for each entry.
5397	+	*
5398	+	* @param map the map
5399	+	* @param action the action
5400	+	*/
5401	+	public static <K,V> ForkJoinTask<Void> forEachEntry
5402	+	(ConcurrentHashMapV8<K,V> map,
5403	+	Action<Map.Entry<K,V>> action) {
5404	+	if (action == null) throw new NullPointerException();
5405	+	return new ForEachEntryTask<K,V>(map, null, -1, action);
5406	+	}
5407	+
5408	+	/**
5409	+	* Returns a task that when invoked, perform the given action
5410	+	* for each non-null transformation of each entry.
5411	+	*
5412	+	* @param map the map
5413	+	* @param transformer a function returning the transformation
5414	+	* for an element, or null if there is no transformation (in
5415	+	* which case the action is not applied)
5416	+	* @param action the action
5417	+	*/
5418	+	public static <K,V,U> ForkJoinTask<Void> forEachEntry
5419	+	(ConcurrentHashMapV8<K,V> map,
5420	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
5421	+	Action<U> action) {
5422	+	if (transformer == null || action == null)
5423	+	throw new NullPointerException();
5424	+	return new ForEachTransformedEntryTask<K,V,U>
5425	+	(map, null, -1, transformer, action);
5426	+	}
5427	+
5428	+	/**
5429	+	* Returns a task that when invoked, returns a non-null result
5430	+	* from applying the given search function on each entry, or
5431	+	* null if none.  Upon success, further element processing is
5432	+	* suppressed and the results of any other parallel
5433	+	* invocations of the search function are ignored.
5434	+	*
5435	+	* @param map the map
5436	+	* @param searchFunction a function returning a non-null
5437	+	* result on success, else null
5438	+	* @return the task
5439	+	*/
5440	+	public static <K,V,U> ForkJoinTask<U> searchEntries
5441	+	(ConcurrentHashMapV8<K,V> map,
5442	+	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
5443	+	if (searchFunction == null) throw new NullPointerException();
5444	+	return new SearchEntriesTask<K,V,U>
5445	+	(map, null, -1, searchFunction,
5446	+	new AtomicReference<U>());
5447	+	}
5448	+
5449	+	/**
5450	+	* Returns a task that when invoked, returns the result of
5451	+	* accumulating all entries using the given reducer to combine
5452	+	* values, or null if none.
5453	+	*
5454	+	* @param map the map
5455	+	* @param reducer a commutative associative combining function
5456	+	* @return the task
5457	+	*/
5458	+	public static <K,V> ForkJoinTask<Map.Entry<K,V>> reduceEntries
5459	+	(ConcurrentHashMapV8<K,V> map,
5460	+	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5461	+	if (reducer == null) throw new NullPointerException();
5462	+	return new ReduceEntriesTask<K,V>
5463	+	(map, null, -1, null, reducer);
5464	+	}
5465	+
5466	+	/**
5467	+	* Returns a task that when invoked, returns the result of
5468	+	* accumulating the given transformation of all entries using the
5469	+	* given reducer to combine values, or null if none.
5470	+	*
5471	+	* @param map the map
5472	+	* @param transformer a function returning the transformation
5473	+	* for an element, or null if there is no transformation (in
5474	+	* which case it is not combined).
5475	+	* @param reducer a commutative associative combining function
5476	+	* @return the task
5477	+	*/
5478	+	public static <K,V,U> ForkJoinTask<U> reduceEntries
5479	+	(ConcurrentHashMapV8<K,V> map,
5480	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
5481	+	BiFun<? super U, ? super U, ? extends U> reducer) {
5482	+	if (transformer == null || reducer == null)
5483	+	throw new NullPointerException();
5484	+	return new MapReduceEntriesTask<K,V,U>
5485	+	(map, null, -1, null, transformer, reducer);
5486	+	}
5487	+
5488	+	/**
5489	+	* Returns a task that when invoked, returns the result of
5490	+	* accumulating the given transformation of all entries using the
5491	+	* given reducer to combine values, and the given basis as an
5492	+	* identity value.
5493	+	*
5494	+	* @param map the map
5495	+	* @param transformer a function returning the transformation
5496	+	* for an element
5497	+	* @param basis the identity (initial default value) for the reduction
5498	+	* @param reducer a commutative associative combining function
5499	+	* @return the task
5500	+	*/
5501	+	public static <K,V> ForkJoinTask<Double> reduceEntriesToDouble
5502	+	(ConcurrentHashMapV8<K,V> map,
5503	+	ObjectToDouble<Map.Entry<K,V>> transformer,
5504	+	double basis,
5505	+	DoubleByDoubleToDouble reducer) {
5506	+	if (transformer == null || reducer == null)
5507	+	throw new NullPointerException();
5508	+	return new MapReduceEntriesToDoubleTask<K,V>
5509	+	(map, null, -1, null, transformer, basis, reducer);
5510	+	}
5511	+
5512	+	/**
5513	+	* Returns a task that when invoked, returns the result of
5514	+	* accumulating the given transformation of all entries using the
5515	+	* given reducer to combine values, and the given basis as an
5516	+	* identity value.
5517	+	*
5518	+	* @param map the map
5519	+	* @param transformer a function returning the transformation
5520	+	* for an element
5521	+	* @param basis the identity (initial default value) for the reduction
5522	+	* @param reducer a commutative associative combining function
5523	+	* @return the task
5524	+	*/
5525	+	public static <K,V> ForkJoinTask<Long> reduceEntriesToLong
5526	+	(ConcurrentHashMapV8<K,V> map,
5527	+	ObjectToLong<Map.Entry<K,V>> transformer,
5528	+	long basis,
5529	+	LongByLongToLong reducer) {
5530	+	if (transformer == null || reducer == null)
5531	+	throw new NullPointerException();
5532	+	return new MapReduceEntriesToLongTask<K,V>
5533	+	(map, null, -1, null, transformer, basis, reducer);
5534	+	}
5535	+
5536	+	/**
5537	+	* Returns a task that when invoked, returns the result of
5538	+	* accumulating the given transformation of all entries using the
5539	+	* given reducer to combine values, and the given basis as an
5540	+	* identity value.
5541	+	*
5542	+	* @param map the map
5543	+	* @param transformer a function returning the transformation
5544	+	* for an element
5545	+	* @param basis the identity (initial default value) for the reduction
5546	+	* @param reducer a commutative associative combining function
5547	+	* @return the task
5548	+	*/
5549	+	public static <K,V> ForkJoinTask<Integer> reduceEntriesToInt
5550	+	(ConcurrentHashMapV8<K,V> map,
5551	+	ObjectToInt<Map.Entry<K,V>> transformer,
5552	+	int basis,
5553	+	IntByIntToInt reducer) {
5554	+	if (transformer == null || reducer == null)
5555	+	throw new NullPointerException();
5556	+	return new MapReduceEntriesToIntTask<K,V>
5557	+	(map, null, -1, null, transformer, basis, reducer);
5558	+	}
5559	+	}
5560	+
5561	+	// -------------------------------------------------------
5562	+
5563	+	/*
5564	+	* Task classes. Coded in a regular but ugly format/style to
5565	+	* simplify checks that each variant differs in the right way from
5566	+	* others. The null screenings exist because compilers cannot tell
5567	+	* that we've already null-checked task arguments, so we force
5568	+	* simplest hoisted bypass to help avoid convoluted traps.
5569	+	*/
5570	+
5571	+	@SuppressWarnings("serial") static final class ForEachKeyTask<K,V>
5572	+	extends Traverser<K,V,Void> {
5573	+	final Action<K> action;
5574	+	ForEachKeyTask
5575	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5576	+	Action<K> action) {
5577	+	super(m, p, b);
5578	+	this.action = action;
5579	+	}
5580	+	@SuppressWarnings("unchecked") public final void compute() {
5581	+	final Action<K> action;
5582	+	if ((action = this.action) != null) {
5583	+	for (int b; (b = preSplit()) > 0;)
5584	+	new ForEachKeyTask<K,V>(map, this, b, action).fork();
5585	+	while (advance() != null)
5586	+	action.apply((K)nextKey);
5587	+	propagateCompletion();
5588	+	}
5589	+	}
5590	+	}
5591	+
5592	+	@SuppressWarnings("serial") static final class ForEachValueTask<K,V>
5593	+	extends Traverser<K,V,Void> {
5594	+	final Action<V> action;
5595	+	ForEachValueTask
5596	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5597	+	Action<V> action) {
5598	+	super(m, p, b);
5599	+	this.action = action;
5600	+	}
5601	+	@SuppressWarnings("unchecked") public final void compute() {
5602	+	final Action<V> action;
5603	+	if ((action = this.action) != null) {
5604	+	for (int b; (b = preSplit()) > 0;)
5605	+	new ForEachValueTask<K,V>(map, this, b, action).fork();
5606	+	V v;
5607	+	while ((v = advance()) != null)
5608	+	action.apply(v);
5609	+	propagateCompletion();
5610	+	}
5611	+	}
5612	+	}
5613	+
5614	+	@SuppressWarnings("serial") static final class ForEachEntryTask<K,V>
5615	+	extends Traverser<K,V,Void> {
5616	+	final Action<Entry<K,V>> action;
5617	+	ForEachEntryTask
5618	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5619	+	Action<Entry<K,V>> action) {
5620	+	super(m, p, b);
5621	+	this.action = action;
5622	+	}
5623	+	@SuppressWarnings("unchecked") public final void compute() {
5624	+	final Action<Entry<K,V>> action;
5625	+	if ((action = this.action) != null) {
5626	+	for (int b; (b = preSplit()) > 0;)
5627	+	new ForEachEntryTask<K,V>(map, this, b, action).fork();
5628	+	V v;
5629	+	while ((v = advance()) != null)
5630	+	action.apply(entryFor((K)nextKey, v));
5631	+	propagateCompletion();
5632	+	}
5633	+	}
5634	+	}
5635	+
5636	+	@SuppressWarnings("serial") static final class ForEachMappingTask<K,V>
5637	+	extends Traverser<K,V,Void> {
5638	+	final BiAction<K,V> action;
5639	+	ForEachMappingTask
5640	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5641	+	BiAction<K,V> action) {
5642	+	super(m, p, b);
5643	+	this.action = action;
5644	+	}
5645	+	@SuppressWarnings("unchecked") public final void compute() {
5646	+	final BiAction<K,V> action;
5647	+	if ((action = this.action) != null) {
5648	+	for (int b; (b = preSplit()) > 0;)
5649	+	new ForEachMappingTask<K,V>(map, this, b, action).fork();
5650	+	V v;
5651	+	while ((v = advance()) != null)
5652	+	action.apply((K)nextKey, v);
5653	+	propagateCompletion();
5654	+	}
5655	+	}
5656	+	}
5657	+
5658	+	@SuppressWarnings("serial") static final class ForEachTransformedKeyTask<K,V,U>
5659	+	extends Traverser<K,V,Void> {
5660	+	final Fun<? super K, ? extends U> transformer;
5661	+	final Action<U> action;
5662	+	ForEachTransformedKeyTask
5663	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5664	+	Fun<? super K, ? extends U> transformer, Action<U> action) {
5665	+	super(m, p, b);
5666	+	this.transformer = transformer; this.action = action;
5667	+	}
5668	+	@SuppressWarnings("unchecked") public final void compute() {
5669	+	final Fun<? super K, ? extends U> transformer;
5670	+	final Action<U> action;
5671	+	if ((transformer = this.transformer) != null &&
5672	+	(action = this.action) != null) {
5673	+	for (int b; (b = preSplit()) > 0;)
5674	+	new ForEachTransformedKeyTask<K,V,U>
5675	+	(map, this, b, transformer, action).fork();
5676	+	U u;
5677	+	while (advance() != null) {
5678	+	if ((u = transformer.apply((K)nextKey)) != null)
5679	+	action.apply(u);
5680	+	}
5681	+	propagateCompletion();
5682	+	}
5683	+	}
5684	+	}
5685	+
5686	+	@SuppressWarnings("serial") static final class ForEachTransformedValueTask<K,V,U>
5687	+	extends Traverser<K,V,Void> {
5688	+	final Fun<? super V, ? extends U> transformer;
5689	+	final Action<U> action;
5690	+	ForEachTransformedValueTask
5691	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5692	+	Fun<? super V, ? extends U> transformer, Action<U> action) {
5693	+	super(m, p, b);
5694	+	this.transformer = transformer; this.action = action;
5695	+	}
5696	+	@SuppressWarnings("unchecked") public final void compute() {
5697	+	final Fun<? super V, ? extends U> transformer;
5698	+	final Action<U> action;
5699	+	if ((transformer = this.transformer) != null &&
5700	+	(action = this.action) != null) {
5701	+	for (int b; (b = preSplit()) > 0;)
5702	+	new ForEachTransformedValueTask<K,V,U>
5703	+	(map, this, b, transformer, action).fork();
5704	+	V v; U u;
5705	+	while ((v = advance()) != null) {
5706	+	if ((u = transformer.apply(v)) != null)
5707	+	action.apply(u);
5708	+	}
5709	+	propagateCompletion();
5710	+	}
5711	+	}
5712	+	}
5713	+
5714	+	@SuppressWarnings("serial") static final class ForEachTransformedEntryTask<K,V,U>
5715	+	extends Traverser<K,V,Void> {
5716	+	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5717	+	final Action<U> action;
5718	+	ForEachTransformedEntryTask
5719	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5720	+	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<U> action) {
5721	+	super(m, p, b);
5722	+	this.transformer = transformer; this.action = action;
5723	+	}
5724	+	@SuppressWarnings("unchecked") public final void compute() {
5725	+	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5726	+	final Action<U> action;
5727	+	if ((transformer = this.transformer) != null &&
5728	+	(action = this.action) != null) {
5729	+	for (int b; (b = preSplit()) > 0;)
5730	+	new ForEachTransformedEntryTask<K,V,U>
5731	+	(map, this, b, transformer, action).fork();
5732	+	V v; U u;
5733	+	while ((v = advance()) != null) {
5734	+	if ((u = transformer.apply(entryFor((K)nextKey,
5735	+	v))) != null)
5736	+	action.apply(u);
5737	+	}
5738	+	propagateCompletion();
5739	+	}
5740	+	}
5741	+	}
5742	+
5743	+	@SuppressWarnings("serial") static final class ForEachTransformedMappingTask<K,V,U>
5744	+	extends Traverser<K,V,Void> {
5745	+	final BiFun<? super K, ? super V, ? extends U> transformer;
5746	+	final Action<U> action;
5747	+	ForEachTransformedMappingTask
5748	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5749	+	BiFun<? super K, ? super V, ? extends U> transformer,
5750	+	Action<U> action) {
5751	+	super(m, p, b);
5752	+	this.transformer = transformer; this.action = action;
5753	+	}
5754	+	@SuppressWarnings("unchecked") public final void compute() {
5755	+	final BiFun<? super K, ? super V, ? extends U> transformer;
5756	+	final Action<U> action;
5757	+	if ((transformer = this.transformer) != null &&
5758	+	(action = this.action) != null) {
5759	+	for (int b; (b = preSplit()) > 0;)
5760	+	new ForEachTransformedMappingTask<K,V,U>
5761	+	(map, this, b, transformer, action).fork();
5762	+	V v; U u;
5763	+	while ((v = advance()) != null) {
5764	+	if ((u = transformer.apply((K)nextKey, v)) != null)
5765	+	action.apply(u);
5766	+	}
5767	+	propagateCompletion();
5768	+	}
5769	+	}
5770	+	}
5771	+
5772	+	@SuppressWarnings("serial") static final class SearchKeysTask<K,V,U>
5773	+	extends Traverser<K,V,U> {
5774	+	final Fun<? super K, ? extends U> searchFunction;
5775	+	final AtomicReference<U> result;
5776	+	SearchKeysTask
5777	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5778	+	Fun<? super K, ? extends U> searchFunction,
5779	+	AtomicReference<U> result) {
5780	+	super(m, p, b);
5781	+	this.searchFunction = searchFunction; this.result = result;
5782	+	}
5783	+	public final U getRawResult() { return result.get(); }
5784	+	@SuppressWarnings("unchecked") public final void compute() {
5785	+	final Fun<? super K, ? extends U> searchFunction;
5786	+	final AtomicReference<U> result;
5787	+	if ((searchFunction = this.searchFunction) != null &&
5788	+	(result = this.result) != null) {
5789	+	for (int b;;) {
5790	+	if (result.get() != null)
5791	+	return;
5792	+	if ((b = preSplit()) <= 0)
5793	+	break;
5794	+	new SearchKeysTask<K,V,U>
5795	+	(map, this, b, searchFunction, result).fork();
5796	+	}
5797	+	while (result.get() == null) {
5798	+	U u;
5799	+	if (advance() == null) {
5800	+	propagateCompletion();
5801	+	break;
5802	+	}
5803	+	if ((u = searchFunction.apply((K)nextKey)) != null) {
5804	+	if (result.compareAndSet(null, u))
5805	+	quietlyCompleteRoot();
5806	+	break;
5807	+	}
5808	+	}
5809	+	}
5810	+	}
5811	+	}
5812	+
5813	+	@SuppressWarnings("serial") static final class SearchValuesTask<K,V,U>
5814	+	extends Traverser<K,V,U> {
5815	+	final Fun<? super V, ? extends U> searchFunction;
5816	+	final AtomicReference<U> result;
5817	+	SearchValuesTask
5818	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5819	+	Fun<? super V, ? extends U> searchFunction,
5820	+	AtomicReference<U> result) {
5821	+	super(m, p, b);
5822	+	this.searchFunction = searchFunction; this.result = result;
5823	+	}
5824	+	public final U getRawResult() { return result.get(); }
5825	+	@SuppressWarnings("unchecked") public final void compute() {
5826	+	final Fun<? super V, ? extends U> searchFunction;
5827	+	final AtomicReference<U> result;
5828	+	if ((searchFunction = this.searchFunction) != null &&
5829	+	(result = this.result) != null) {
5830	+	for (int b;;) {
5831	+	if (result.get() != null)
5832	+	return;
5833	+	if ((b = preSplit()) <= 0)
5834	+	break;
5835	+	new SearchValuesTask<K,V,U>
5836	+	(map, this, b, searchFunction, result).fork();
5837	+	}
5838	+	while (result.get() == null) {
5839	+	V v; U u;
5840	+	if ((v = advance()) == null) {
5841	+	propagateCompletion();
5842	+	break;
5843	+	}
5844	+	if ((u = searchFunction.apply(v)) != null) {
5845	+	if (result.compareAndSet(null, u))
5846	+	quietlyCompleteRoot();
5847	+	break;
5848	+	}
5849	+	}
5850	+	}
5851	+	}
5852	+	}
5853	+
5854	+	@SuppressWarnings("serial") static final class SearchEntriesTask<K,V,U>
5855	+	extends Traverser<K,V,U> {
5856	+	final Fun<Entry<K,V>, ? extends U> searchFunction;
5857	+	final AtomicReference<U> result;
5858	+	SearchEntriesTask
5859	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5860	+	Fun<Entry<K,V>, ? extends U> searchFunction,
5861	+	AtomicReference<U> result) {
5862	+	super(m, p, b);
5863	+	this.searchFunction = searchFunction; this.result = result;
5864	+	}
5865	+	public final U getRawResult() { return result.get(); }
5866	+	@SuppressWarnings("unchecked") public final void compute() {
5867	+	final Fun<Entry<K,V>, ? extends U> searchFunction;
5868	+	final AtomicReference<U> result;
5869	+	if ((searchFunction = this.searchFunction) != null &&
5870	+	(result = this.result) != null) {
5871	+	for (int b;;) {
5872	+	if (result.get() != null)
5873	+	return;
5874	+	if ((b = preSplit()) <= 0)
5875	+	break;
5876	+	new SearchEntriesTask<K,V,U>
5877	+	(map, this, b, searchFunction, result).fork();
5878	+	}
5879	+	while (result.get() == null) {
5880	+	V v; U u;
5881	+	if ((v = advance()) == null) {
5882	+	propagateCompletion();
5883	+	break;
5884	+	}
5885	+	if ((u = searchFunction.apply(entryFor((K)nextKey,
5886	+	v))) != null) {
5887	+	if (result.compareAndSet(null, u))
5888	+	quietlyCompleteRoot();
5889	+	return;
5890	+	}
5891	+	}
5892	+	}
5893	+	}
5894	+	}
5895	+
5896	+	@SuppressWarnings("serial") static final class SearchMappingsTask<K,V,U>
5897	+	extends Traverser<K,V,U> {
5898	+	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5899	+	final AtomicReference<U> result;
5900	+	SearchMappingsTask
5901	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5902	+	BiFun<? super K, ? super V, ? extends U> searchFunction,
5903	+	AtomicReference<U> result) {
5904	+	super(m, p, b);
5905	+	this.searchFunction = searchFunction; this.result = result;
5906	+	}
5907	+	public final U getRawResult() { return result.get(); }
5908	+	@SuppressWarnings("unchecked") public final void compute() {
5909	+	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5910	+	final AtomicReference<U> result;
5911	+	if ((searchFunction = this.searchFunction) != null &&
5912	+	(result = this.result) != null) {
5913	+	for (int b;;) {
5914	+	if (result.get() != null)
5915	+	return;
5916	+	if ((b = preSplit()) <= 0)
5917	+	break;
5918	+	new SearchMappingsTask<K,V,U>
5919	+	(map, this, b, searchFunction, result).fork();
5920	+	}
5921	+	while (result.get() == null) {
5922	+	V v; U u;
5923	+	if ((v = advance()) == null) {
5924	+	propagateCompletion();
5925	+	break;
5926	+	}
5927	+	if ((u = searchFunction.apply((K)nextKey, v)) != null) {
5928	+	if (result.compareAndSet(null, u))
5929	+	quietlyCompleteRoot();
5930	+	break;
5931	+	}
5932	+	}
5933	+	}
5934	+	}
5935	+	}
5936	+
5937	+	@SuppressWarnings("serial") static final class ReduceKeysTask<K,V>
5938	+	extends Traverser<K,V,K> {
5939	+	final BiFun<? super K, ? super K, ? extends K> reducer;
5940	+	K result;
5941	+	ReduceKeysTask<K,V> rights, nextRight;
5942	+	ReduceKeysTask
5943	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5944	+	ReduceKeysTask<K,V> nextRight,
5945	+	BiFun<? super K, ? super K, ? extends K> reducer) {
5946	+	super(m, p, b); this.nextRight = nextRight;
5947	+	this.reducer = reducer;
5948	+	}
5949	+	public final K getRawResult() { return result; }
5950	+	@SuppressWarnings("unchecked") public final void compute() {
5951	+	final BiFun<? super K, ? super K, ? extends K> reducer;
5952	+	if ((reducer = this.reducer) != null) {
5953	+	for (int b; (b = preSplit()) > 0;)
5954	+	(rights = new ReduceKeysTask<K,V>
5955	+	(map, this, b, rights, reducer)).fork();
5956	+	K r = null;
5957	+	while (advance() != null) {
5958	+	K u = (K)nextKey;
5959	+	r = (r == null) ? u : reducer.apply(r, u);
5960	+	}
5961	+	result = r;
5962	+	CountedCompleter<?> c;
5963	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5964	+	ReduceKeysTask<K,V>
5965	+	t = (ReduceKeysTask<K,V>)c,
5966	+	s = t.rights;
5967	+	while (s != null) {
5968	+	K tr, sr;
5969	+	if ((sr = s.result) != null)
5970	+	t.result = (((tr = t.result) == null) ? sr :
5971	+	reducer.apply(tr, sr));
5972	+	s = t.rights = s.nextRight;
5973	+	}
5974	+	}
5975	+	}
5976	+	}
5977	+	}
5978	+
5979	+	@SuppressWarnings("serial") static final class ReduceValuesTask<K,V>
5980	+	extends Traverser<K,V,V> {
5981	+	final BiFun<? super V, ? super V, ? extends V> reducer;
5982	+	V result;
5983	+	ReduceValuesTask<K,V> rights, nextRight;
5984	+	ReduceValuesTask
5985	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
5986	+	ReduceValuesTask<K,V> nextRight,
5987	+	BiFun<? super V, ? super V, ? extends V> reducer) {
5988	+	super(m, p, b); this.nextRight = nextRight;
5989	+	this.reducer = reducer;
5990	+	}
5991	+	public final V getRawResult() { return result; }
5992	+	@SuppressWarnings("unchecked") public final void compute() {
5993	+	final BiFun<? super V, ? super V, ? extends V> reducer;
5994	+	if ((reducer = this.reducer) != null) {
5995	+	for (int b; (b = preSplit()) > 0;)
5996	+	(rights = new ReduceValuesTask<K,V>
5997	+	(map, this, b, rights, reducer)).fork();
5998	+	V r = null;
5999	+	V v;
6000	+	while ((v = advance()) != null) {
6001	+	V u = v;
6002	+	r = (r == null) ? u : reducer.apply(r, u);
6003	+	}
6004	+	result = r;
6005	+	CountedCompleter<?> c;
6006	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6007	+	ReduceValuesTask<K,V>
6008	+	t = (ReduceValuesTask<K,V>)c,
6009	+	s = t.rights;
6010	+	while (s != null) {
6011	+	V tr, sr;
6012	+	if ((sr = s.result) != null)
6013	+	t.result = (((tr = t.result) == null) ? sr :
6014	+	reducer.apply(tr, sr));
6015	+	s = t.rights = s.nextRight;
6016	+	}
6017	+	}
6018	+	}
6019	+	}
6020	+	}
6021	+
6022	+	@SuppressWarnings("serial") static final class ReduceEntriesTask<K,V>
6023	+	extends Traverser<K,V,Map.Entry<K,V>> {
6024	+	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
6025	+	Map.Entry<K,V> result;
6026	+	ReduceEntriesTask<K,V> rights, nextRight;
6027	+	ReduceEntriesTask
6028	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6029	+	ReduceEntriesTask<K,V> nextRight,
6030	+	BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
6031	+	super(m, p, b); this.nextRight = nextRight;
6032	+	this.reducer = reducer;
6033	+	}
6034	+	public final Map.Entry<K,V> getRawResult() { return result; }
6035	+	@SuppressWarnings("unchecked") public final void compute() {
6036	+	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
6037	+	if ((reducer = this.reducer) != null) {
6038	+	for (int b; (b = preSplit()) > 0;)
6039	+	(rights = new ReduceEntriesTask<K,V>
6040	+	(map, this, b, rights, reducer)).fork();
6041	+	Map.Entry<K,V> r = null;
6042	+	V v;
6043	+	while ((v = advance()) != null) {
6044	+	Map.Entry<K,V> u = entryFor((K)nextKey, v);
6045	+	r = (r == null) ? u : reducer.apply(r, u);
6046	+	}
6047	+	result = r;
6048	+	CountedCompleter<?> c;
6049	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6050	+	ReduceEntriesTask<K,V>
6051	+	t = (ReduceEntriesTask<K,V>)c,
6052	+	s = t.rights;
6053	+	while (s != null) {
6054	+	Map.Entry<K,V> tr, sr;
6055	+	if ((sr = s.result) != null)
6056	+	t.result = (((tr = t.result) == null) ? sr :
6057	+	reducer.apply(tr, sr));
6058	+	s = t.rights = s.nextRight;
6059	+	}
6060	+	}
6061	+	}
6062	+	}
6063	+	}
6064	+
6065	+	@SuppressWarnings("serial") static final class MapReduceKeysTask<K,V,U>
6066	+	extends Traverser<K,V,U> {
6067	+	final Fun<? super K, ? extends U> transformer;
6068	+	final BiFun<? super U, ? super U, ? extends U> reducer;
6069	+	U result;
6070	+	MapReduceKeysTask<K,V,U> rights, nextRight;
6071	+	MapReduceKeysTask
6072	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6073	+	MapReduceKeysTask<K,V,U> nextRight,
6074	+	Fun<? super K, ? extends U> transformer,
6075	+	BiFun<? super U, ? super U, ? extends U> reducer) {
6076	+	super(m, p, b); this.nextRight = nextRight;
6077	+	this.transformer = transformer;
6078	+	this.reducer = reducer;
6079	+	}
6080	+	public final U getRawResult() { return result; }
6081	+	@SuppressWarnings("unchecked") public final void compute() {
6082	+	final Fun<? super K, ? extends U> transformer;
6083	+	final BiFun<? super U, ? super U, ? extends U> reducer;
6084	+	if ((transformer = this.transformer) != null &&
6085	+	(reducer = this.reducer) != null) {
6086	+	for (int b; (b = preSplit()) > 0;)
6087	+	(rights = new MapReduceKeysTask<K,V,U>
6088	+	(map, this, b, rights, transformer, reducer)).fork();
6089	+	U r = null, u;
6090	+	while (advance() != null) {
6091	+	if ((u = transformer.apply((K)nextKey)) != null)
6092	+	r = (r == null) ? u : reducer.apply(r, u);
6093	+	}
6094	+	result = r;
6095	+	CountedCompleter<?> c;
6096	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6097	+	MapReduceKeysTask<K,V,U>
6098	+	t = (MapReduceKeysTask<K,V,U>)c,
6099	+	s = t.rights;
6100	+	while (s != null) {
6101	+	U tr, sr;
6102	+	if ((sr = s.result) != null)
6103	+	t.result = (((tr = t.result) == null) ? sr :
6104	+	reducer.apply(tr, sr));
6105	+	s = t.rights = s.nextRight;
6106	+	}
6107	+	}
6108	+	}
6109	+	}
6110	+	}
6111	+
6112	+	@SuppressWarnings("serial") static final class MapReduceValuesTask<K,V,U>
6113	+	extends Traverser<K,V,U> {
6114	+	final Fun<? super V, ? extends U> transformer;
6115	+	final BiFun<? super U, ? super U, ? extends U> reducer;
6116	+	U result;
6117	+	MapReduceValuesTask<K,V,U> rights, nextRight;
6118	+	MapReduceValuesTask
6119	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6120	+	MapReduceValuesTask<K,V,U> nextRight,
6121	+	Fun<? super V, ? extends U> transformer,
6122	+	BiFun<? super U, ? super U, ? extends U> reducer) {
6123	+	super(m, p, b); this.nextRight = nextRight;
6124	+	this.transformer = transformer;
6125	+	this.reducer = reducer;
6126	+	}
6127	+	public final U getRawResult() { return result; }
6128	+	@SuppressWarnings("unchecked") public final void compute() {
6129	+	final Fun<? super V, ? extends U> transformer;
6130	+	final BiFun<? super U, ? super U, ? extends U> reducer;
6131	+	if ((transformer = this.transformer) != null &&
6132	+	(reducer = this.reducer) != null) {
6133	+	for (int b; (b = preSplit()) > 0;)
6134	+	(rights = new MapReduceValuesTask<K,V,U>
6135	+	(map, this, b, rights, transformer, reducer)).fork();
6136	+	U r = null, u;
6137	+	V v;
6138	+	while ((v = advance()) != null) {
6139	+	if ((u = transformer.apply(v)) != null)
6140	+	r = (r == null) ? u : reducer.apply(r, u);
6141	+	}
6142	+	result = r;
6143	+	CountedCompleter<?> c;
6144	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6145	+	MapReduceValuesTask<K,V,U>
6146	+	t = (MapReduceValuesTask<K,V,U>)c,
6147	+	s = t.rights;
6148	+	while (s != null) {
6149	+	U tr, sr;
6150	+	if ((sr = s.result) != null)
6151	+	t.result = (((tr = t.result) == null) ? sr :
6152	+	reducer.apply(tr, sr));
6153	+	s = t.rights = s.nextRight;
6154	+	}
6155	+	}
6156	+	}
6157	+	}
6158	+	}
6159	+
6160	+	@SuppressWarnings("serial") static final class MapReduceEntriesTask<K,V,U>
6161	+	extends Traverser<K,V,U> {
6162	+	final Fun<Map.Entry<K,V>, ? extends U> transformer;
6163	+	final BiFun<? super U, ? super U, ? extends U> reducer;
6164	+	U result;
6165	+	MapReduceEntriesTask<K,V,U> rights, nextRight;
6166	+	MapReduceEntriesTask
6167	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6168	+	MapReduceEntriesTask<K,V,U> nextRight,
6169	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
6170	+	BiFun<? super U, ? super U, ? extends U> reducer) {
6171	+	super(m, p, b); this.nextRight = nextRight;
6172	+	this.transformer = transformer;
6173	+	this.reducer = reducer;
6174	+	}
6175	+	public final U getRawResult() { return result; }
6176	+	@SuppressWarnings("unchecked") public final void compute() {
6177	+	final Fun<Map.Entry<K,V>, ? extends U> transformer;
6178	+	final BiFun<? super U, ? super U, ? extends U> reducer;
6179	+	if ((transformer = this.transformer) != null &&
6180	+	(reducer = this.reducer) != null) {
6181	+	for (int b; (b = preSplit()) > 0;)
6182	+	(rights = new MapReduceEntriesTask<K,V,U>
6183	+	(map, this, b, rights, transformer, reducer)).fork();
6184	+	U r = null, u;
6185	+	V v;
6186	+	while ((v = advance()) != null) {
6187	+	if ((u = transformer.apply(entryFor((K)nextKey,
6188	+	v))) != null)
6189	+	r = (r == null) ? u : reducer.apply(r, u);
6190	+	}
6191	+	result = r;
6192	+	CountedCompleter<?> c;
6193	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6194	+	MapReduceEntriesTask<K,V,U>
6195	+	t = (MapReduceEntriesTask<K,V,U>)c,
6196	+	s = t.rights;
6197	+	while (s != null) {
6198	+	U tr, sr;
6199	+	if ((sr = s.result) != null)
6200	+	t.result = (((tr = t.result) == null) ? sr :
6201	+	reducer.apply(tr, sr));
6202	+	s = t.rights = s.nextRight;
6203	+	}
6204	+	}
6205	+	}
6206	+	}
6207	+	}
6208	+
6209	+	@SuppressWarnings("serial") static final class MapReduceMappingsTask<K,V,U>
6210	+	extends Traverser<K,V,U> {
6211	+	final BiFun<? super K, ? super V, ? extends U> transformer;
6212	+	final BiFun<? super U, ? super U, ? extends U> reducer;
6213	+	U result;
6214	+	MapReduceMappingsTask<K,V,U> rights, nextRight;
6215	+	MapReduceMappingsTask
6216	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6217	+	MapReduceMappingsTask<K,V,U> nextRight,
6218	+	BiFun<? super K, ? super V, ? extends U> transformer,
6219	+	BiFun<? super U, ? super U, ? extends U> reducer) {
6220	+	super(m, p, b); this.nextRight = nextRight;
6221	+	this.transformer = transformer;
6222	+	this.reducer = reducer;
6223	+	}
6224	+	public final U getRawResult() { return result; }
6225	+	@SuppressWarnings("unchecked") public final void compute() {
6226	+	final BiFun<? super K, ? super V, ? extends U> transformer;
6227	+	final BiFun<? super U, ? super U, ? extends U> reducer;
6228	+	if ((transformer = this.transformer) != null &&
6229	+	(reducer = this.reducer) != null) {
6230	+	for (int b; (b = preSplit()) > 0;)
6231	+	(rights = new MapReduceMappingsTask<K,V,U>
6232	+	(map, this, b, rights, transformer, reducer)).fork();
6233	+	U r = null, u;
6234	+	V v;
6235	+	while ((v = advance()) != null) {
6236	+	if ((u = transformer.apply((K)nextKey, v)) != null)
6237	+	r = (r == null) ? u : reducer.apply(r, u);
6238	+	}
6239	+	result = r;
6240	+	CountedCompleter<?> c;
6241	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6242	+	MapReduceMappingsTask<K,V,U>
6243	+	t = (MapReduceMappingsTask<K,V,U>)c,
6244	+	s = t.rights;
6245	+	while (s != null) {
6246	+	U tr, sr;
6247	+	if ((sr = s.result) != null)
6248	+	t.result = (((tr = t.result) == null) ? sr :
6249	+	reducer.apply(tr, sr));
6250	+	s = t.rights = s.nextRight;
6251	+	}
6252	+	}
6253	+	}
6254	+	}
6255	+	}
6256	+
6257	+	@SuppressWarnings("serial") static final class MapReduceKeysToDoubleTask<K,V>
6258	+	extends Traverser<K,V,Double> {
6259	+	final ObjectToDouble<? super K> transformer;
6260	+	final DoubleByDoubleToDouble reducer;
6261	+	final double basis;
6262	+	double result;
6263	+	MapReduceKeysToDoubleTask<K,V> rights, nextRight;
6264	+	MapReduceKeysToDoubleTask
6265	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6266	+	MapReduceKeysToDoubleTask<K,V> nextRight,
6267	+	ObjectToDouble<? super K> transformer,
6268	+	double basis,
6269	+	DoubleByDoubleToDouble reducer) {
6270	+	super(m, p, b); this.nextRight = nextRight;
6271	+	this.transformer = transformer;
6272	+	this.basis = basis; this.reducer = reducer;
6273	+	}
6274	+	public final Double getRawResult() { return result; }
6275	+	@SuppressWarnings("unchecked") public final void compute() {
6276	+	final ObjectToDouble<? super K> transformer;
6277	+	final DoubleByDoubleToDouble reducer;
6278	+	if ((transformer = this.transformer) != null &&
6279	+	(reducer = this.reducer) != null) {
6280	+	double r = this.basis;
6281	+	for (int b; (b = preSplit()) > 0;)
6282	+	(rights = new MapReduceKeysToDoubleTask<K,V>
6283	+	(map, this, b, rights, transformer, r, reducer)).fork();
6284	+	while (advance() != null)
6285	+	r = reducer.apply(r, transformer.apply((K)nextKey));
6286	+	result = r;
6287	+	CountedCompleter<?> c;
6288	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6289	+	MapReduceKeysToDoubleTask<K,V>
6290	+	t = (MapReduceKeysToDoubleTask<K,V>)c,
6291	+	s = t.rights;
6292	+	while (s != null) {
6293	+	t.result = reducer.apply(t.result, s.result);
6294	+	s = t.rights = s.nextRight;
6295	+	}
6296	+	}
6297	+	}
6298	+	}
6299	+	}
6300	+
6301	+	@SuppressWarnings("serial") static final class MapReduceValuesToDoubleTask<K,V>
6302	+	extends Traverser<K,V,Double> {
6303	+	final ObjectToDouble<? super V> transformer;
6304	+	final DoubleByDoubleToDouble reducer;
6305	+	final double basis;
6306	+	double result;
6307	+	MapReduceValuesToDoubleTask<K,V> rights, nextRight;
6308	+	MapReduceValuesToDoubleTask
6309	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6310	+	MapReduceValuesToDoubleTask<K,V> nextRight,
6311	+	ObjectToDouble<? super V> transformer,
6312	+	double basis,
6313	+	DoubleByDoubleToDouble reducer) {
6314	+	super(m, p, b); this.nextRight = nextRight;
6315	+	this.transformer = transformer;
6316	+	this.basis = basis; this.reducer = reducer;
6317	+	}
6318	+	public final Double getRawResult() { return result; }
6319	+	@SuppressWarnings("unchecked") public final void compute() {
6320	+	final ObjectToDouble<? super V> transformer;
6321	+	final DoubleByDoubleToDouble reducer;
6322	+	if ((transformer = this.transformer) != null &&
6323	+	(reducer = this.reducer) != null) {
6324	+	double r = this.basis;
6325	+	for (int b; (b = preSplit()) > 0;)
6326	+	(rights = new MapReduceValuesToDoubleTask<K,V>
6327	+	(map, this, b, rights, transformer, r, reducer)).fork();
6328	+	V v;
6329	+	while ((v = advance()) != null)
6330	+	r = reducer.apply(r, transformer.apply(v));
6331	+	result = r;
6332	+	CountedCompleter<?> c;
6333	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6334	+	MapReduceValuesToDoubleTask<K,V>
6335	+	t = (MapReduceValuesToDoubleTask<K,V>)c,
6336	+	s = t.rights;
6337	+	while (s != null) {
6338	+	t.result = reducer.apply(t.result, s.result);
6339	+	s = t.rights = s.nextRight;
6340	+	}
6341	+	}
6342	+	}
6343	+	}
6344	+	}
6345	+
6346	+	@SuppressWarnings("serial") static final class MapReduceEntriesToDoubleTask<K,V>
6347	+	extends Traverser<K,V,Double> {
6348	+	final ObjectToDouble<Map.Entry<K,V>> transformer;
6349	+	final DoubleByDoubleToDouble reducer;
6350	+	final double basis;
6351	+	double result;
6352	+	MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
6353	+	MapReduceEntriesToDoubleTask
6354	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6355	+	MapReduceEntriesToDoubleTask<K,V> nextRight,
6356	+	ObjectToDouble<Map.Entry<K,V>> transformer,
6357	+	double basis,
6358	+	DoubleByDoubleToDouble reducer) {
6359	+	super(m, p, b); this.nextRight = nextRight;
6360	+	this.transformer = transformer;
6361	+	this.basis = basis; this.reducer = reducer;
6362	+	}
6363	+	public final Double getRawResult() { return result; }
6364	+	@SuppressWarnings("unchecked") public final void compute() {
6365	+	final ObjectToDouble<Map.Entry<K,V>> transformer;
6366	+	final DoubleByDoubleToDouble reducer;
6367	+	if ((transformer = this.transformer) != null &&
6368	+	(reducer = this.reducer) != null) {
6369	+	double r = this.basis;
6370	+	for (int b; (b = preSplit()) > 0;)
6371	+	(rights = new MapReduceEntriesToDoubleTask<K,V>
6372	+	(map, this, b, rights, transformer, r, reducer)).fork();
6373	+	V v;
6374	+	while ((v = advance()) != null)
6375	+	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
6376	+	v)));
6377	+	result = r;
6378	+	CountedCompleter<?> c;
6379	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6380	+	MapReduceEntriesToDoubleTask<K,V>
6381	+	t = (MapReduceEntriesToDoubleTask<K,V>)c,
6382	+	s = t.rights;
6383	+	while (s != null) {
6384	+	t.result = reducer.apply(t.result, s.result);
6385	+	s = t.rights = s.nextRight;
6386	+	}
6387	+	}
6388	+	}
6389	+	}
6390	+	}
6391	+
6392	+	@SuppressWarnings("serial") static final class MapReduceMappingsToDoubleTask<K,V>
6393	+	extends Traverser<K,V,Double> {
6394	+	final ObjectByObjectToDouble<? super K, ? super V> transformer;
6395	+	final DoubleByDoubleToDouble reducer;
6396	+	final double basis;
6397	+	double result;
6398	+	MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
6399	+	MapReduceMappingsToDoubleTask
6400	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6401	+	MapReduceMappingsToDoubleTask<K,V> nextRight,
6402	+	ObjectByObjectToDouble<? super K, ? super V> transformer,
6403	+	double basis,
6404	+	DoubleByDoubleToDouble reducer) {
6405	+	super(m, p, b); this.nextRight = nextRight;
6406	+	this.transformer = transformer;
6407	+	this.basis = basis; this.reducer = reducer;
6408	+	}
6409	+	public final Double getRawResult() { return result; }
6410	+	@SuppressWarnings("unchecked") public final void compute() {
6411	+	final ObjectByObjectToDouble<? super K, ? super V> transformer;
6412	+	final DoubleByDoubleToDouble reducer;
6413	+	if ((transformer = this.transformer) != null &&
6414	+	(reducer = this.reducer) != null) {
6415	+	double r = this.basis;
6416	+	for (int b; (b = preSplit()) > 0;)
6417	+	(rights = new MapReduceMappingsToDoubleTask<K,V>
6418	+	(map, this, b, rights, transformer, r, reducer)).fork();
6419	+	V v;
6420	+	while ((v = advance()) != null)
6421	+	r = reducer.apply(r, transformer.apply((K)nextKey, v));
6422	+	result = r;
6423	+	CountedCompleter<?> c;
6424	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6425	+	MapReduceMappingsToDoubleTask<K,V>
6426	+	t = (MapReduceMappingsToDoubleTask<K,V>)c,
6427	+	s = t.rights;
6428	+	while (s != null) {
6429	+	t.result = reducer.apply(t.result, s.result);
6430	+	s = t.rights = s.nextRight;
6431	+	}
6432	+	}
6433	+	}
6434	+	}
6435	+	}
6436	+
6437	+	@SuppressWarnings("serial") static final class MapReduceKeysToLongTask<K,V>
6438	+	extends Traverser<K,V,Long> {
6439	+	final ObjectToLong<? super K> transformer;
6440	+	final LongByLongToLong reducer;
6441	+	final long basis;
6442	+	long result;
6443	+	MapReduceKeysToLongTask<K,V> rights, nextRight;
6444	+	MapReduceKeysToLongTask
6445	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6446	+	MapReduceKeysToLongTask<K,V> nextRight,
6447	+	ObjectToLong<? super K> transformer,
6448	+	long basis,
6449	+	LongByLongToLong reducer) {
6450	+	super(m, p, b); this.nextRight = nextRight;
6451	+	this.transformer = transformer;
6452	+	this.basis = basis; this.reducer = reducer;
6453	+	}
6454	+	public final Long getRawResult() { return result; }
6455	+	@SuppressWarnings("unchecked") public final void compute() {
6456	+	final ObjectToLong<? super K> transformer;
6457	+	final LongByLongToLong reducer;
6458	+	if ((transformer = this.transformer) != null &&
6459	+	(reducer = this.reducer) != null) {
6460	+	long r = this.basis;
6461	+	for (int b; (b = preSplit()) > 0;)
6462	+	(rights = new MapReduceKeysToLongTask<K,V>
6463	+	(map, this, b, rights, transformer, r, reducer)).fork();
6464	+	while (advance() != null)
6465	+	r = reducer.apply(r, transformer.apply((K)nextKey));
6466	+	result = r;
6467	+	CountedCompleter<?> c;
6468	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6469	+	MapReduceKeysToLongTask<K,V>
6470	+	t = (MapReduceKeysToLongTask<K,V>)c,
6471	+	s = t.rights;
6472	+	while (s != null) {
6473	+	t.result = reducer.apply(t.result, s.result);
6474	+	s = t.rights = s.nextRight;
6475	+	}
6476	+	}
6477	+	}
6478	+	}
6479	+	}
6480	+
6481	+	@SuppressWarnings("serial") static final class MapReduceValuesToLongTask<K,V>
6482	+	extends Traverser<K,V,Long> {
6483	+	final ObjectToLong<? super V> transformer;
6484	+	final LongByLongToLong reducer;
6485	+	final long basis;
6486	+	long result;
6487	+	MapReduceValuesToLongTask<K,V> rights, nextRight;
6488	+	MapReduceValuesToLongTask
6489	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6490	+	MapReduceValuesToLongTask<K,V> nextRight,
6491	+	ObjectToLong<? super V> transformer,
6492	+	long basis,
6493	+	LongByLongToLong reducer) {
6494	+	super(m, p, b); this.nextRight = nextRight;
6495	+	this.transformer = transformer;
6496	+	this.basis = basis; this.reducer = reducer;
6497	+	}
6498	+	public final Long getRawResult() { return result; }
6499	+	@SuppressWarnings("unchecked") public final void compute() {
6500	+	final ObjectToLong<? super V> transformer;
6501	+	final LongByLongToLong reducer;
6502	+	if ((transformer = this.transformer) != null &&
6503	+	(reducer = this.reducer) != null) {
6504	+	long r = this.basis;
6505	+	for (int b; (b = preSplit()) > 0;)
6506	+	(rights = new MapReduceValuesToLongTask<K,V>
6507	+	(map, this, b, rights, transformer, r, reducer)).fork();
6508	+	V v;
6509	+	while ((v = advance()) != null)
6510	+	r = reducer.apply(r, transformer.apply(v));
6511	+	result = r;
6512	+	CountedCompleter<?> c;
6513	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6514	+	MapReduceValuesToLongTask<K,V>
6515	+	t = (MapReduceValuesToLongTask<K,V>)c,
6516	+	s = t.rights;
6517	+	while (s != null) {
6518	+	t.result = reducer.apply(t.result, s.result);
6519	+	s = t.rights = s.nextRight;
6520	+	}
6521	+	}
6522	+	}
6523	+	}
6524	+	}
6525	+
6526	+	@SuppressWarnings("serial") static final class MapReduceEntriesToLongTask<K,V>
6527	+	extends Traverser<K,V,Long> {
6528	+	final ObjectToLong<Map.Entry<K,V>> transformer;
6529	+	final LongByLongToLong reducer;
6530	+	final long basis;
6531	+	long result;
6532	+	MapReduceEntriesToLongTask<K,V> rights, nextRight;
6533	+	MapReduceEntriesToLongTask
6534	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6535	+	MapReduceEntriesToLongTask<K,V> nextRight,
6536	+	ObjectToLong<Map.Entry<K,V>> transformer,
6537	+	long basis,
6538	+	LongByLongToLong reducer) {
6539	+	super(m, p, b); this.nextRight = nextRight;
6540	+	this.transformer = transformer;
6541	+	this.basis = basis; this.reducer = reducer;
6542	+	}
6543	+	public final Long getRawResult() { return result; }
6544	+	@SuppressWarnings("unchecked") public final void compute() {
6545	+	final ObjectToLong<Map.Entry<K,V>> transformer;
6546	+	final LongByLongToLong reducer;
6547	+	if ((transformer = this.transformer) != null &&
6548	+	(reducer = this.reducer) != null) {
6549	+	long r = this.basis;
6550	+	for (int b; (b = preSplit()) > 0;)
6551	+	(rights = new MapReduceEntriesToLongTask<K,V>
6552	+	(map, this, b, rights, transformer, r, reducer)).fork();
6553	+	V v;
6554	+	while ((v = advance()) != null)
6555	+	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
6556	+	v)));
6557	+	result = r;
6558	+	CountedCompleter<?> c;
6559	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6560	+	MapReduceEntriesToLongTask<K,V>
6561	+	t = (MapReduceEntriesToLongTask<K,V>)c,
6562	+	s = t.rights;
6563	+	while (s != null) {
6564	+	t.result = reducer.apply(t.result, s.result);
6565	+	s = t.rights = s.nextRight;
6566	+	}
6567	+	}
6568	+	}
6569	+	}
6570	+	}
6571	+
6572	+	@SuppressWarnings("serial") static final class MapReduceMappingsToLongTask<K,V>
6573	+	extends Traverser<K,V,Long> {
6574	+	final ObjectByObjectToLong<? super K, ? super V> transformer;
6575	+	final LongByLongToLong reducer;
6576	+	final long basis;
6577	+	long result;
6578	+	MapReduceMappingsToLongTask<K,V> rights, nextRight;
6579	+	MapReduceMappingsToLongTask
6580	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6581	+	MapReduceMappingsToLongTask<K,V> nextRight,
6582	+	ObjectByObjectToLong<? super K, ? super V> transformer,
6583	+	long basis,
6584	+	LongByLongToLong reducer) {
6585	+	super(m, p, b); this.nextRight = nextRight;
6586	+	this.transformer = transformer;
6587	+	this.basis = basis; this.reducer = reducer;
6588	+	}
6589	+	public final Long getRawResult() { return result; }
6590	+	@SuppressWarnings("unchecked") public final void compute() {
6591	+	final ObjectByObjectToLong<? super K, ? super V> transformer;
6592	+	final LongByLongToLong reducer;
6593	+	if ((transformer = this.transformer) != null &&
6594	+	(reducer = this.reducer) != null) {
6595	+	long r = this.basis;
6596	+	for (int b; (b = preSplit()) > 0;)
6597	+	(rights = new MapReduceMappingsToLongTask<K,V>
6598	+	(map, this, b, rights, transformer, r, reducer)).fork();
6599	+	V v;
6600	+	while ((v = advance()) != null)
6601	+	r = reducer.apply(r, transformer.apply((K)nextKey, v));
6602	+	result = r;
6603	+	CountedCompleter<?> c;
6604	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6605	+	MapReduceMappingsToLongTask<K,V>
6606	+	t = (MapReduceMappingsToLongTask<K,V>)c,
6607	+	s = t.rights;
6608	+	while (s != null) {
6609	+	t.result = reducer.apply(t.result, s.result);
6610	+	s = t.rights = s.nextRight;
6611	+	}
6612	+	}
6613	+	}
6614	+	}
6615	+	}
6616	+
6617	+	@SuppressWarnings("serial") static final class MapReduceKeysToIntTask<K,V>
6618	+	extends Traverser<K,V,Integer> {
6619	+	final ObjectToInt<? super K> transformer;
6620	+	final IntByIntToInt reducer;
6621	+	final int basis;
6622	+	int result;
6623	+	MapReduceKeysToIntTask<K,V> rights, nextRight;
6624	+	MapReduceKeysToIntTask
6625	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6626	+	MapReduceKeysToIntTask<K,V> nextRight,
6627	+	ObjectToInt<? super K> transformer,
6628	+	int basis,
6629	+	IntByIntToInt reducer) {
6630	+	super(m, p, b); this.nextRight = nextRight;
6631	+	this.transformer = transformer;
6632	+	this.basis = basis; this.reducer = reducer;
6633	+	}
6634	+	public final Integer getRawResult() { return result; }
6635	+	@SuppressWarnings("unchecked") public final void compute() {
6636	+	final ObjectToInt<? super K> transformer;
6637	+	final IntByIntToInt reducer;
6638	+	if ((transformer = this.transformer) != null &&
6639	+	(reducer = this.reducer) != null) {
6640	+	int r = this.basis;
6641	+	for (int b; (b = preSplit()) > 0;)
6642	+	(rights = new MapReduceKeysToIntTask<K,V>
6643	+	(map, this, b, rights, transformer, r, reducer)).fork();
6644	+	while (advance() != null)
6645	+	r = reducer.apply(r, transformer.apply((K)nextKey));
6646	+	result = r;
6647	+	CountedCompleter<?> c;
6648	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6649	+	MapReduceKeysToIntTask<K,V>
6650	+	t = (MapReduceKeysToIntTask<K,V>)c,
6651	+	s = t.rights;
6652	+	while (s != null) {
6653	+	t.result = reducer.apply(t.result, s.result);
6654	+	s = t.rights = s.nextRight;
6655	+	}
6656	+	}
6657	+	}
6658	+	}
6659	+	}
6660	+
6661	+	@SuppressWarnings("serial") static final class MapReduceValuesToIntTask<K,V>
6662	+	extends Traverser<K,V,Integer> {
6663	+	final ObjectToInt<? super V> transformer;
6664	+	final IntByIntToInt reducer;
6665	+	final int basis;
6666	+	int result;
6667	+	MapReduceValuesToIntTask<K,V> rights, nextRight;
6668	+	MapReduceValuesToIntTask
6669	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6670	+	MapReduceValuesToIntTask<K,V> nextRight,
6671	+	ObjectToInt<? super V> transformer,
6672	+	int basis,
6673	+	IntByIntToInt reducer) {
6674	+	super(m, p, b); this.nextRight = nextRight;
6675	+	this.transformer = transformer;
6676	+	this.basis = basis; this.reducer = reducer;
6677	+	}
6678	+	public final Integer getRawResult() { return result; }
6679	+	@SuppressWarnings("unchecked") public final void compute() {
6680	+	final ObjectToInt<? super V> transformer;
6681	+	final IntByIntToInt reducer;
6682	+	if ((transformer = this.transformer) != null &&
6683	+	(reducer = this.reducer) != null) {
6684	+	int r = this.basis;
6685	+	for (int b; (b = preSplit()) > 0;)
6686	+	(rights = new MapReduceValuesToIntTask<K,V>
6687	+	(map, this, b, rights, transformer, r, reducer)).fork();
6688	+	V v;
6689	+	while ((v = advance()) != null)
6690	+	r = reducer.apply(r, transformer.apply(v));
6691	+	result = r;
6692	+	CountedCompleter<?> c;
6693	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6694	+	MapReduceValuesToIntTask<K,V>
6695	+	t = (MapReduceValuesToIntTask<K,V>)c,
6696	+	s = t.rights;
6697	+	while (s != null) {
6698	+	t.result = reducer.apply(t.result, s.result);
6699	+	s = t.rights = s.nextRight;
6700	+	}
6701	+	}
6702	+	}
6703	+	}
6704	+	}
6705	+
6706	+	@SuppressWarnings("serial") static final class MapReduceEntriesToIntTask<K,V>
6707	+	extends Traverser<K,V,Integer> {
6708	+	final ObjectToInt<Map.Entry<K,V>> transformer;
6709	+	final IntByIntToInt reducer;
6710	+	final int basis;
6711	+	int result;
6712	+	MapReduceEntriesToIntTask<K,V> rights, nextRight;
6713	+	MapReduceEntriesToIntTask
6714	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6715	+	MapReduceEntriesToIntTask<K,V> nextRight,
6716	+	ObjectToInt<Map.Entry<K,V>> transformer,
6717	+	int basis,
6718	+	IntByIntToInt reducer) {
6719	+	super(m, p, b); this.nextRight = nextRight;
6720	+	this.transformer = transformer;
6721	+	this.basis = basis; this.reducer = reducer;
6722	+	}
6723	+	public final Integer getRawResult() { return result; }
6724	+	@SuppressWarnings("unchecked") public final void compute() {
6725	+	final ObjectToInt<Map.Entry<K,V>> transformer;
6726	+	final IntByIntToInt reducer;
6727	+	if ((transformer = this.transformer) != null &&
6728	+	(reducer = this.reducer) != null) {
6729	+	int r = this.basis;
6730	+	for (int b; (b = preSplit()) > 0;)
6731	+	(rights = new MapReduceEntriesToIntTask<K,V>
6732	+	(map, this, b, rights, transformer, r, reducer)).fork();
6733	+	V v;
6734	+	while ((v = advance()) != null)
6735	+	r = reducer.apply(r, transformer.apply(entryFor((K)nextKey,
6736	+	v)));
6737	+	result = r;
6738	+	CountedCompleter<?> c;
6739	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6740	+	MapReduceEntriesToIntTask<K,V>
6741	+	t = (MapReduceEntriesToIntTask<K,V>)c,
6742	+	s = t.rights;
6743	+	while (s != null) {
6744	+	t.result = reducer.apply(t.result, s.result);
6745	+	s = t.rights = s.nextRight;
6746	+	}
6747	+	}
6748	+	}
6749	+	}
6750	+	}
6751	+
6752	+	@SuppressWarnings("serial") static final class MapReduceMappingsToIntTask<K,V>
6753	+	extends Traverser<K,V,Integer> {
6754	+	final ObjectByObjectToInt<? super K, ? super V> transformer;
6755	+	final IntByIntToInt reducer;
6756	+	final int basis;
6757	+	int result;
6758	+	MapReduceMappingsToIntTask<K,V> rights, nextRight;
6759	+	MapReduceMappingsToIntTask
6760	+	(ConcurrentHashMapV8<K,V> m, Traverser<K,V,?> p, int b,
6761	+	MapReduceMappingsToIntTask<K,V> nextRight,
6762	+	ObjectByObjectToInt<? super K, ? super V> transformer,
6763	+	int basis,
6764	+	IntByIntToInt reducer) {
6765	+	super(m, p, b); this.nextRight = nextRight;
6766	+	this.transformer = transformer;
6767	+	this.basis = basis; this.reducer = reducer;
6768	+	}
6769	+	public final Integer getRawResult() { return result; }
6770	+	@SuppressWarnings("unchecked") public final void compute() {
6771	+	final ObjectByObjectToInt<? super K, ? super V> transformer;
6772	+	final IntByIntToInt reducer;
6773	+	if ((transformer = this.transformer) != null &&
6774	+	(reducer = this.reducer) != null) {
6775	+	int r = this.basis;
6776	+	for (int b; (b = preSplit()) > 0;)
6777	+	(rights = new MapReduceMappingsToIntTask<K,V>
6778	+	(map, this, b, rights, transformer, r, reducer)).fork();
6779	+	V v;
6780	+	while ((v = advance()) != null)
6781	+	r = reducer.apply(r, transformer.apply((K)nextKey, v));
6782	+	result = r;
6783	+	CountedCompleter<?> c;
6784	+	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6785	+	MapReduceMappingsToIntTask<K,V>
6786	+	t = (MapReduceMappingsToIntTask<K,V>)c,
6787	+	s = t.rights;
6788	+	while (s != null) {
6789	+	t.result = reducer.apply(t.result, s.result);
6790	+	s = t.rights = s.nextRight;
6791	+	}
6792	+	}
6793	+	}
6794	+	}
6795	+	}
6796	+
6797		// Unsafe mechanics
6798	<	private static final sun.misc.Unsafe UNSAFE;
6799	<	private static final long counterOffset;
6800	<	private static final long resizingOffset;
6798	>	private static final sun.misc.Unsafe U;
6799	>	private static final long SIZECTL;
6800	>	private static final long TRANSFERINDEX;
6801	>	private static final long TRANSFERORIGIN;
6802	>	private static final long BASECOUNT;
6803	>	private static final long COUNTERBUSY;
6804	>	private static final long CELLVALUE;
6805		private static final long ABASE;
6806		private static final int ASHIFT;
6807
6808		static {
1692	–	int ss;
6809		try {
6810	<	UNSAFE = getUnsafe();
6810	>	U = getUnsafe();
6811		Class<?> k = ConcurrentHashMapV8.class;
6812	<	counterOffset = UNSAFE.objectFieldOffset
6813	<	(k.getDeclaredField("counter"));
6814	<	resizingOffset = UNSAFE.objectFieldOffset
6815	<	(k.getDeclaredField("resizing"));
6812	>	SIZECTL = U.objectFieldOffset
6813	>	(k.getDeclaredField("sizeCtl"));
6814	>	TRANSFERINDEX = U.objectFieldOffset
6815	>	(k.getDeclaredField("transferIndex"));
6816	>	TRANSFERORIGIN = U.objectFieldOffset
6817	>	(k.getDeclaredField("transferOrigin"));
6818	>	BASECOUNT = U.objectFieldOffset
6819	>	(k.getDeclaredField("baseCount"));
6820	>	COUNTERBUSY = U.objectFieldOffset
6821	>	(k.getDeclaredField("counterBusy"));
6822	>	Class<?> ck = CounterCell.class;
6823	>	CELLVALUE = U.objectFieldOffset
6824	>	(ck.getDeclaredField("value"));
6825		Class<?> sc = Node[].class;
6826	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6827	<	ss = UNSAFE.arrayIndexScale(sc);
6826	>	ABASE = U.arrayBaseOffset(sc);
6827	>	int scale = U.arrayIndexScale(sc);
6828	>	if ((scale & (scale - 1)) != 0)
6829	>	throw new Error("data type scale not a power of two");
6830	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6831		} catch (Exception e) {
6832		throw new Error(e);
6833		}
1706	–	if ((ss & (ss-1)) != 0)
1707	–	throw new Error("data type scale not a power of two");
1708	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6834		}
6835
6836		/**
#	Line 1718 | Line 6843 | public class ConcurrentHashMapV8<K, V>
6843		private static sun.misc.Unsafe getUnsafe() {
6844		try {
6845		return sun.misc.Unsafe.getUnsafe();
6846	<	} catch (SecurityException se) {
6847	<	try {
6848	<	return java.security.AccessController.doPrivileged
6849	<	(new java.security
6850	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6851	<	public sun.misc.Unsafe run() throws Exception {
6852	<	java.lang.reflect.Field f = sun.misc
6853	<	.Unsafe.class.getDeclaredField("theUnsafe");
6854	<	f.setAccessible(true);
6855	<	return (sun.misc.Unsafe) f.get(null);
6856	<	}});
6857	<	} catch (java.security.PrivilegedActionException e) {
6858	<	throw new RuntimeException("Could not initialize intrinsics",
6859	<	e.getCause());
6860	<	}
6846	>	} catch (SecurityException tryReflectionInstead) {}
6847	>	try {
6848	>	return java.security.AccessController.doPrivileged
6849	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6850	>	public sun.misc.Unsafe run() throws Exception {
6851	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6852	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6853	>	f.setAccessible(true);
6854	>	Object x = f.get(null);
6855	>	if (k.isInstance(x))
6856	>	return k.cast(x);
6857	>	}
6858	>	throw new NoSuchFieldError("the Unsafe");
6859	>	}});
6860	>	} catch (java.security.PrivilegedActionException e) {
6861	>	throw new RuntimeException("Could not initialize intrinsics",
6862	>	e.getCause());
6863		}
6864		}
1738	–
6865		}

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