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Comparing jsr166/src/jsr166e/ConcurrentHashMapV8.java (file contents):
Revision 1.43 by jsr166, Wed Jul 4 20:21:02 2012 UTC vs.
Revision 1.122 by jsr166, Thu Feb 26 06:53:34 2015 UTC

#	Line 5 | Line 5
5		*/
6
7		package jsr166e;
8	<	import jsr166e.LongAdder;
8	>
9	>	import jsr166e.ForkJoinPool;
10	>
11	>	import java.io.ObjectStreamField;
12	>	import java.io.Serializable;
13	>	import java.lang.reflect.ParameterizedType;
14	>	import java.lang.reflect.Type;
15	>	import java.util.AbstractMap;
16		import java.util.Arrays;
10	–	import java.util.Map;
11	–	import java.util.Set;
17		import java.util.Collection;
18	<	import java.util.AbstractMap;
19	<	import java.util.AbstractSet;
15	<	import java.util.AbstractCollection;
16	<	import java.util.Hashtable;
18	>	import java.util.ConcurrentModificationException;
19	>	import java.util.Enumeration;
20		import java.util.HashMap;
21	+	import java.util.Hashtable;
22		import java.util.Iterator;
23	<	import java.util.Enumeration;
20	<	import java.util.ConcurrentModificationException;
23	>	import java.util.Map;
24		import java.util.NoSuchElementException;
25	+	import java.util.Set;
26		import java.util.concurrent.ConcurrentMap;
27	<	import java.util.concurrent.ThreadLocalRandom;
27	>	import java.util.concurrent.atomic.AtomicReference;
28	>	import java.util.concurrent.atomic.AtomicInteger;
29		import java.util.concurrent.locks.LockSupport;
30	<	import java.util.concurrent.locks.AbstractQueuedSynchronizer;
26	<	import java.io.Serializable;
30	>	import java.util.concurrent.locks.ReentrantLock;
31
32		/**
33		* A hash table supporting full concurrency of retrievals and
#	Line 37 | Line 41 | import java.io.Serializable;
41		* interoperable with {@code Hashtable} in programs that rely on its
42		* thread safety but not on its synchronization details.
43		*
44	<	* <p> Retrieval operations (including {@code get}) generally do not
44	>	* <p>Retrieval operations (including {@code get}) generally do not
45		* block, so may overlap with update operations (including {@code put}
46		* and {@code remove}). Retrievals reflect the results of the most
47		* recently <em>completed</em> update operations holding upon their
48	<	* onset.  For aggregate operations such as {@code putAll} and {@code
49	<	* clear}, concurrent retrievals may reflect insertion or removal of
50	<	* only some entries.  Similarly, Iterators and Enumerations return
51	<	* elements reflecting the state of the hash table at some point at or
52	<	* since the creation of the iterator/enumeration.  They do
53	<	* <em>not</em> throw {@link ConcurrentModificationException}.
54	<	* However, iterators are designed to be used by only one thread at a
55	<	* time.  Bear in mind that the results of aggregate status methods
56	<	* including {@code size}, {@code isEmpty}, and {@code containsValue}
57	<	* are typically useful only when a map is not undergoing concurrent
58	<	* updates in other threads.  Otherwise the results of these methods
59	<	* reflect transient states that may be adequate for monitoring
60	<	* or estimation purposes, but not for program control.
48	>	* onset. (More formally, an update operation for a given key bears a
49	>	* <em>happens-before</em> relation with any (non-null) retrieval for
50	>	* that key reporting the updated value.)  For aggregate operations
51	>	* such as {@code putAll} and {@code clear}, concurrent retrievals may
52	>	* reflect insertion or removal of only some entries.  Similarly,
53	>	* Iterators and Enumerations return elements reflecting the state of
54	>	* the hash table at some point at or since the creation of the
55	>	* iterator/enumeration.  They do <em>not</em> throw {@link
56	>	* ConcurrentModificationException}.  However, iterators are designed
57	>	* to be used by only one thread at a time.  Bear in mind that the
58	>	* results of aggregate status methods including {@code size}, {@code
59	>	* isEmpty}, and {@code containsValue} are typically useful only when
60	>	* a map is not undergoing concurrent updates in other threads.
61	>	* Otherwise the results of these methods reflect transient states
62	>	* that may be adequate for monitoring or estimation purposes, but not
63	>	* for program control.
64		*
65	<	* <p> The table is dynamically expanded when there are too many
65	>	* <p>The table is dynamically expanded when there are too many
66		* collisions (i.e., keys that have distinct hash codes but fall into
67		* the same slot modulo the table size), with the expected average
68		* effect of maintaining roughly two bins per mapping (corresponding
#	Line 74 | Line 81 | import java.io.Serializable;
81		* expected {@code concurrencyLevel} as an additional hint for
82		* internal sizing.  Note that using many keys with exactly the same
83		* {@code hashCode()} is a sure way to slow down performance of any
84	<	* hash table.
84	>	* hash table. To ameliorate impact, when keys are {@link Comparable},
85	>	* this class may use comparison order among keys to help break ties.
86	>	*
87	>	* <p>A {@link Set} projection of a ConcurrentHashMapV8 may be created
88	>	* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed
89	>	* (using {@link #keySet(Object)} when only keys are of interest, and the
90	>	* mapped values are (perhaps transiently) not used or all take the
91	>	* same mapping value.
92		*
93		* <p>This class and its views and iterators implement all of the
94		* <em>optional</em> methods of the {@link Map} and {@link Iterator}
95		* interfaces.
96		*
97	<	* <p> Like {@link Hashtable} but unlike {@link HashMap}, this class
97	>	* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class
98		* does <em>not</em> allow {@code null} to be used as a key or value.
99		*
100	+	* <p>ConcurrentHashMapV8s support a set of sequential and parallel bulk
101	+	* operations that are designed
102	+	* to be safely, and often sensibly, applied even with maps that are
103	+	* being concurrently updated by other threads; for example, when
104	+	* computing a snapshot summary of the values in a shared registry.
105	+	* There are three kinds of operation, each with four forms, accepting
106	+	* functions with Keys, Values, Entries, and (Key, Value) arguments
107	+	* and/or return values. Because the elements of a ConcurrentHashMapV8
108	+	* are not ordered in any particular way, and may be processed in
109	+	* different orders in different parallel executions, the correctness
110	+	* of supplied functions should not depend on any ordering, or on any
111	+	* other objects or values that may transiently change while
112	+	* computation is in progress; and except for forEach actions, should
113	+	* ideally be side-effect-free. Bulk operations on {@link java.util.Map.Entry}
114	+	* objects do not support method {@code setValue}.
115	+	*
116	+	* <ul>
117	+	* <li> forEach: Perform a given action on each element.
118	+	* A variant form applies a given transformation on each element
119	+	* before performing the action.</li>
120	+	*
121	+	* <li> search: Return the first available non-null result of
122	+	* applying a given function on each element; skipping further
123	+	* search when a result is found.</li>
124	+	*
125	+	* <li> reduce: Accumulate each element.  The supplied reduction
126	+	* function cannot rely on ordering (more formally, it should be
127	+	* both associative and commutative).  There are five variants:
128	+	*
129	+	* <ul>
130	+	*
131	+	* <li> Plain reductions. (There is not a form of this method for
132	+	* (key, value) function arguments since there is no corresponding
133	+	* return type.)</li>
134	+	*
135	+	* <li> Mapped reductions that accumulate the results of a given
136	+	* function applied to each element.</li>
137	+	*
138	+	* <li> Reductions to scalar doubles, longs, and ints, using a
139	+	* given basis value.</li>
140	+	*
141	+	* </ul>
142	+	* </li>
143	+	* </ul>
144	+	*
145	+	* <p>These bulk operations accept a {@code parallelismThreshold}
146	+	* argument. Methods proceed sequentially if the current map size is
147	+	* estimated to be less than the given threshold. Using a value of
148	+	* {@code Long.MAX_VALUE} suppresses all parallelism.  Using a value
149	+	* of {@code 1} results in maximal parallelism by partitioning into
150	+	* enough subtasks to fully utilize the {@link
151	+	* ForkJoinPool#commonPool()} that is used for all parallel
152	+	* computations. Normally, you would initially choose one of these
153	+	* extreme values, and then measure performance of using in-between
154	+	* values that trade off overhead versus throughput.
155	+	*
156	+	* <p>The concurrency properties of bulk operations follow
157	+	* from those of ConcurrentHashMapV8: Any non-null result returned
158	+	* from {@code get(key)} and related access methods bears a
159	+	* happens-before relation with the associated insertion or
160	+	* update.  The result of any bulk operation reflects the
161	+	* composition of these per-element relations (but is not
162	+	* necessarily atomic with respect to the map as a whole unless it
163	+	* is somehow known to be quiescent).  Conversely, because keys
164	+	* and values in the map are never null, null serves as a reliable
165	+	* atomic indicator of the current lack of any result.  To
166	+	* maintain this property, null serves as an implicit basis for
167	+	* all non-scalar reduction operations. For the double, long, and
168	+	* int versions, the basis should be one that, when combined with
169	+	* any other value, returns that other value (more formally, it
170	+	* should be the identity element for the reduction). Most common
171	+	* reductions have these properties; for example, computing a sum
172	+	* with basis 0 or a minimum with basis MAX_VALUE.
173	+	*
174	+	* <p>Search and transformation functions provided as arguments
175	+	* should similarly return null to indicate the lack of any result
176	+	* (in which case it is not used). In the case of mapped
177	+	* reductions, this also enables transformations to serve as
178	+	* filters, returning null (or, in the case of primitive
179	+	* specializations, the identity basis) if the element should not
180	+	* be combined. You can create compound transformations and
181	+	* filterings by composing them yourself under this "null means
182	+	* there is nothing there now" rule before using them in search or
183	+	* reduce operations.
184	+	*
185	+	* <p>Methods accepting and/or returning Entry arguments maintain
186	+	* key-value associations. They may be useful for example when
187	+	* finding the key for the greatest value. Note that "plain" Entry
188	+	* arguments can be supplied using {@code new
189	+	* AbstractMap.SimpleEntry(k,v)}.
190	+	*
191	+	* <p>Bulk operations may complete abruptly, throwing an
192	+	* exception encountered in the application of a supplied
193	+	* function. Bear in mind when handling such exceptions that other
194	+	* concurrently executing functions could also have thrown
195	+	* exceptions, or would have done so if the first exception had
196	+	* not occurred.
197	+	*
198	+	* <p>Speedups for parallel compared to sequential forms are common
199	+	* but not guaranteed.  Parallel operations involving brief functions
200	+	* on small maps may execute more slowly than sequential forms if the
201	+	* underlying work to parallelize the computation is more expensive
202	+	* than the computation itself.  Similarly, parallelization may not
203	+	* lead to much actual parallelism if all processors are busy
204	+	* performing unrelated tasks.
205	+	*
206	+	* <p>All arguments to all task methods must be non-null.
207	+	*
208	+	* <p><em>jsr166e note: During transition, this class
209	+	* uses nested functional interfaces with different names but the
210	+	* same forms as those expected for JDK8.</em>
211	+	*
212		* <p>This class is a member of the
213		* <a href="{@docRoot}/../technotes/guides/collections/index.html">
214		* Java Collections Framework</a>.
215		*
90	–	* <p><em>jsr166e note: This class is a candidate replacement for
91	–	* java.util.concurrent.ConcurrentHashMap.<em>
92	–	*
216		* @since 1.5
217		* @author Doug Lea
218		* @param <K> the type of keys maintained by this map
219		* @param <V> the type of mapped values
220		*/
221	<	public class ConcurrentHashMapV8<K, V>
222	<	implements ConcurrentMap<K, V>, Serializable {
221	>	public class ConcurrentHashMapV8<K,V> extends AbstractMap<K,V>
222	>	implements ConcurrentMap<K,V>, Serializable {
223		private static final long serialVersionUID = 7249069246763182397L;
224
225		/**
226	<	* A function computing a mapping from the given key to a value.
227	<	* This is a place-holder for an upcoming JDK8 interface.
226	>	* An object for traversing and partitioning elements of a source.
227	>	* This interface provides a subset of the functionality of JDK8
228	>	* java.util.Spliterator.
229		*/
230	<	public static interface MappingFunction<K, V> {
230	>	public static interface ConcurrentHashMapSpliterator<T> {
231		/**
232	<	* Returns a value for the given key, or null if there is no mapping.
233	<	*
234	<	* @param key the (non-null) key
235	<	* @return a value for the key, or null if none
232	>	* If possible, returns a new spliterator covering
233	>	* approximately one half of the elements, which will not be
234	>	* covered by this spliterator. Returns null if cannot be
235	>	* split.
236		*/
237	<	V map(K key);
114	<	}
115	<
116	<	/**
117	<	* A function computing a new mapping given a key and its current
118	<	* mapped value (or {@code null} if there is no current
119	<	* mapping). This is a place-holder for an upcoming JDK8
120	<	* interface.
121	<	*/
122	<	public static interface RemappingFunction<K, V> {
237	>	ConcurrentHashMapSpliterator<T> trySplit();
238		/**
239	<	* Returns a new value given a key and its current value.
240	<	*
126	<	* @param key the (non-null) key
127	<	* @param value the current value, or null if there is no mapping
128	<	* @return a value for the key, or null if none
129	<	*/
130	<	V remap(K key, V value);
131	<	}
132	<
133	<	/**
134	<	* A partitionable iterator. A Spliterator can be traversed
135	<	* directly, but can also be partitioned (before traversal) by
136	<	* creating another Spliterator that covers a non-overlapping
137	<	* portion of the elements, and so may be amenable to parallel
138	<	* execution.
139	<	*
140	<	* <p> This interface exports a subset of expected JDK8
141	<	* functionality.
142	<	*
143	<	* <p>Sample usage: Here is one (of the several) ways to compute
144	<	* the sum of the values held in a map using the ForkJoin
145	<	* framework. As illustrated here, Spliterators are well suited to
146	<	* designs in which a task repeatedly splits off half its work
147	<	* into forked subtasks until small enough to process directly,
148	<	* and then joins these subtasks. Variants of this style can be
149	<	* also be used in completion-based designs.
150	<	*
151	<	* <pre>
152	<	* {@code ConcurrentHashMapV8<String, Long> m = ...
153	<	* // Uses parallel depth of log2 of size / (parallelism * slack of 8).
154	<	* int depth = 32 - Integer.numberOfLeadingZeros(m.size() / (aForkJoinPool.getParallelism() * 8));
155	<	* long sum = aForkJoinPool.invoke(new SumValues(m.valueSpliterator(), depth, null));
156	<	* // ...
157	<	* static class SumValues extends RecursiveTask<Long> {
158	<	*   final Spliterator<Long> s;
159	<	*   final int depth;             // number of splits before processing
160	<	*   final SumValues nextJoin;    // records forked subtasks to join
161	<	*   SumValues(Spliterator<Long> s, int depth, SumValues nextJoin) {
162	<	*     this.s = s; this.depth = depth; this.nextJoin = nextJoin;
163	<	*   }
164	<	*   public Long compute() {
165	<	*     long sum = 0;
166	<	*     SumValues subtasks = null; // fork subtasks
167	<	*     for (int d = depth - 1; d >= 0; --d)
168	<	*       (subtasks = new SumValues(s.split(), d, subtasks)).fork();
169	<	*     while (s.hasNext())        // directly process remaining elements
170	<	*       sum += s.next();
171	<	*     for (SumValues t = subtasks; t != null; t = t.nextJoin)
172	<	*       sum += t.join();         // collect subtask results
173	<	*     return sum;
174	<	*   }
175	<	* }
176	<	* }</pre>
177	<	*/
178	<	public static interface Spliterator<T> extends Iterator<T> {
179	<	/**
180	<	* Returns a Spliterator covering approximately half of the
181	<	* elements, guaranteed not to overlap with those subsequently
182	<	* returned by this Spliterator.  After invoking this method,
183	<	* the current Spliterator will <em>not</em> produce any of
184	<	* the elements of the returned Spliterator, but the two
185	<	* Spliterators together will produce all of the elements that
186	<	* would have been produced by this Spliterator had this
187	<	* method not been called. The exact number of elements
188	<	* produced by the returned Spliterator is not guaranteed, and
189	<	* may be zero (i.e., with {@code hasNext()} reporting {@code
190	<	* false}) if this Spliterator cannot be further split.
191	<	*
192	<	* @return a Spliterator covering approximately half of the
193	<	* elements
194	<	* @throws IllegalStateException if this Spliterator has
195	<	* already commenced traversing elements.
196	<	*/
197	<	Spliterator<T> split();
198	<
199	<	/**
200	<	* Returns a Spliterator producing the same elements as this
201	<	* Spliterator. This method may be used for example to create
202	<	* a second Spliterator before a traversal, in order to later
203	<	* perform a second traversal.
204	<	*
205	<	* @return a Spliterator covering the same range as this Spliterator.
206	<	* @throws IllegalStateException if this Spliterator has
207	<	* already commenced traversing elements.
239	>	* Returns an estimate of the number of elements covered by
240	>	* this Spliterator.
241		*/
242	<	Spliterator<T> clone();
243	<	}
242	>	long estimateSize();
243	>
244	>	/** Applies the action to each untraversed element */
245	>	void forEachRemaining(Action<? super T> action);
246	>	/** If an element remains, applies the action and returns true. */
247	>	boolean tryAdvance(Action<? super T> action);
248	>	}
249	>
250	>	// Sams
251	>	/** Interface describing a void action of one argument */
252	>	public interface Action<A> { void apply(A a); }
253	>	/** Interface describing a void action of two arguments */
254	>	public interface BiAction<A,B> { void apply(A a, B b); }
255	>	/** Interface describing a function of one argument */
256	>	public interface Fun<A,T> { T apply(A a); }
257	>	/** Interface describing a function of two arguments */
258	>	public interface BiFun<A,B,T> { T apply(A a, B b); }
259	>	/** Interface describing a function mapping its argument to a double */
260	>	public interface ObjectToDouble<A> { double apply(A a); }
261	>	/** Interface describing a function mapping its argument to a long */
262	>	public interface ObjectToLong<A> { long apply(A a); }
263	>	/** Interface describing a function mapping its argument to an int */
264	>	public interface ObjectToInt<A> {int apply(A a); }
265	>	/** Interface describing a function mapping two arguments to a double */
266	>	public interface ObjectByObjectToDouble<A,B> { double apply(A a, B b); }
267	>	/** Interface describing a function mapping two arguments to a long */
268	>	public interface ObjectByObjectToLong<A,B> { long apply(A a, B b); }
269	>	/** Interface describing a function mapping two arguments to an int */
270	>	public interface ObjectByObjectToInt<A,B> {int apply(A a, B b); }
271	>	/** Interface describing a function mapping two doubles to a double */
272	>	public interface DoubleByDoubleToDouble { double apply(double a, double b); }
273	>	/** Interface describing a function mapping two longs to a long */
274	>	public interface LongByLongToLong { long apply(long a, long b); }
275	>	/** Interface describing a function mapping two ints to an int */
276	>	public interface IntByIntToInt { int apply(int a, int b); }
277	>
278
279		/*
280		* Overview:
#	Line 219 | Line 286 | public class ConcurrentHashMapV8<K, V>
286		* the same or better than java.util.HashMap, and to support high
287		* initial insertion rates on an empty table by many threads.
288		*
289	<	* Each key-value mapping is held in a Node.  Because Node fields
290	<	* can contain special values, they are defined using plain Object
291	<	* types. Similarly in turn, all internal methods that use them
292	<	* work off Object types. And similarly, so do the internal
293	<	* methods of auxiliary iterator and view classes.  All public
294	<	* generic typed methods relay in/out of these internal methods,
295	<	* supplying null-checks and casts as needed. This also allows
296	<	* many of the public methods to be factored into a smaller number
297	<	* of internal methods (although sadly not so for the five
298	<	* variants of put-related operations). The validation-based
299	<	* approach explained below leads to a lot of code sprawl because
300	<	* retry-control precludes factoring into smaller methods.
289	>	* This map usually acts as a binned (bucketed) hash table.  Each
290	>	* key-value mapping is held in a Node.  Most nodes are instances
291	>	* of the basic Node class with hash, key, value, and next
292	>	* fields. However, various subclasses exist: TreeNodes are
293	>	* arranged in balanced trees, not lists.  TreeBins hold the roots
294	>	* of sets of TreeNodes. ForwardingNodes are placed at the heads
295	>	* of bins during resizing. ReservationNodes are used as
296	>	* placeholders while establishing values in computeIfAbsent and
297	>	* related methods.  The types TreeBin, ForwardingNode, and
298	>	* ReservationNode do not hold normal user keys, values, or
299	>	* hashes, and are readily distinguishable during search etc
300	>	* because they have negative hash fields and null key and value
301	>	* fields. (These special nodes are either uncommon or transient,
302	>	* so the impact of carrying around some unused fields is
303	>	* insignificant.)
304		*
305		* The table is lazily initialized to a power-of-two size upon the
306		* first insertion.  Each bin in the table normally contains a
#	Line 238 | Line 308 | public class ConcurrentHashMapV8<K, V>
308		* Table accesses require volatile/atomic reads, writes, and
309		* CASes.  Because there is no other way to arrange this without
310		* adding further indirections, we use intrinsics
311	<	* (sun.misc.Unsafe) operations.  The lists of nodes within bins
312	<	* are always accurately traversable under volatile reads, so long
313	<	* as lookups check hash code and non-nullness of value before
314	<	* checking key equality.
315	<	*
316	<	* We use the top two bits of Node hash fields for control
247	<	* purposes -- they are available anyway because of addressing
248	<	* constraints.  As explained further below, these top bits are
249	<	* used as follows:
250	<	*  00 - Normal
251	<	*  01 - Locked
252	<	*  11 - Locked and may have a thread waiting for lock
253	<	*  10 - Node is a forwarding node
254	<	*
255	<	* The lower 30 bits of each Node's hash field contain a
256	<	* transformation of the key's hash code, except for forwarding
257	<	* nodes, for which the lower bits are zero (and so always have
258	<	* hash field == MOVED).
311	>	* (sun.misc.Unsafe) operations.
312	>	*
313	>	* We use the top (sign) bit of Node hash fields for control
314	>	* purposes -- it is available anyway because of addressing
315	>	* constraints.  Nodes with negative hash fields are specially
316	>	* handled or ignored in map methods.
317		*
318		* Insertion (via put or its variants) of the first node in an
319		* empty bin is performed by just CASing it to the bin.  This is
#	Line 264 | Line 322 | public class ConcurrentHashMapV8<K, V>
322		* delete, and replace) require locks.  We do not want to waste
323		* the space required to associate a distinct lock object with
324		* each bin, so instead use the first node of a bin list itself as
325	<	* a lock. Blocking support for these locks relies on the builtin
326	<	* "synchronized" monitors.  However, we also need a tryLock
269	<	* construction, so we overlay these by using bits of the Node
270	<	* hash field for lock control (see above), and so normally use
271	<	* builtin monitors only for blocking and signalling using
272	<	* wait/notifyAll constructions. See Node.tryAwaitLock.
325	>	* a lock. Locking support for these locks relies on builtin
326	>	* "synchronized" monitors.
327		*
328		* Using the first node of a list as a lock does not by itself
329		* suffice though: When a node is locked, any update must first
330		* validate that it is still the first node after locking it, and
331		* retry if not. Because new nodes are always appended to lists,
332		* once a node is first in a bin, it remains first until deleted
333	<	* or the bin becomes invalidated (upon resizing).  However,
280	<	* operations that only conditionally update may inspect nodes
281	<	* until the point of update. This is a converse of sorts to the
282	<	* lazy locking technique described by Herlihy & Shavit.
333	>	* or the bin becomes invalidated (upon resizing).
334		*
335		* The main disadvantage of per-bin locks is that other update
336		* operations on other nodes in a bin list protected by the same
#	Line 312 | Line 363 | public class ConcurrentHashMapV8<K, V>
363		* sometimes deviate significantly from uniform randomness.  This
364		* includes the case when N > (1<<30), so some keys MUST collide.
365		* Similarly for dumb or hostile usages in which multiple keys are
366	<	* designed to have identical hash codes. Also, although we guard
367	<	* against the worst effects of this (see method spread), sets of
368	<	* hashes may differ only in bits that do not impact their bin
369	<	* index for a given power-of-two mask.  So we use a secondary
370	<	* strategy that applies when the number of nodes in a bin exceeds
371	<	* a threshold, and at least one of the keys implements
321	<	* Comparable.  These TreeBins use a balanced tree to hold nodes
322	<	* (a specialized form of red-black trees), bounding search time
323	<	* to O(log N).  Each search step in a TreeBin is around twice as
366	>	* designed to have identical hash codes or ones that differs only
367	>	* in masked-out high bits. So we use a secondary strategy that
368	>	* applies when the number of nodes in a bin exceeds a
369	>	* threshold. These TreeBins use a balanced tree to hold nodes (a
370	>	* specialized form of red-black trees), bounding search time to
371	>	* O(log N).  Each search step in a TreeBin is at least twice as
372		* slow as in a regular list, but given that N cannot exceed
373		* (1<<64) (before running out of addresses) this bounds search
374		* steps, lock hold times, etc, to reasonable constants (roughly
#	Line 331 | Line 379 | public class ConcurrentHashMapV8<K, V>
379		* iterators in the same way.
380		*
381		* The table is resized when occupancy exceeds a percentage
382	<	* threshold (nominally, 0.75, but see below).  Only a single
383	<	* thread performs the resize (using field "sizeCtl", to arrange
384	<	* exclusion), but the table otherwise remains usable for reads
385	<	* and updates. Resizing proceeds by transferring bins, one by
386	<	* one, from the table to the next table.  Because we are using
387	<	* power-of-two expansion, the elements from each bin must either
388	<	* stay at same index, or move with a power of two offset. We
389	<	* eliminate unnecessary node creation by catching cases where old
390	<	* nodes can be reused because their next fields won't change.  On
391	<	* average, only about one-sixth of them need cloning when a table
392	<	* doubles. The nodes they replace will be garbage collectable as
393	<	* soon as they are no longer referenced by any reader thread that
394	<	* may be in the midst of concurrently traversing table.  Upon
395	<	* transfer, the old table bin contains only a special forwarding
396	<	* node (with hash field "MOVED") that contains the next table as
397	<	* its key. On encountering a forwarding node, access and update
398	<	* operations restart, using the new table.
399	<	*
400	<	* Each bin transfer requires its bin lock. However, unlike other
401	<	* cases, a transfer can skip a bin if it fails to acquire its
402	<	* lock, and revisit it later (unless it is a TreeBin). Method
403	<	* rebuild maintains a buffer of TRANSFER_BUFFER_SIZE bins that
404	<	* have been skipped because of failure to acquire a lock, and
405	<	* blocks only if none are available (i.e., only very rarely).
406	<	* The transfer operation must also ensure that all accessible
407	<	* bins in both the old and new table are usable by any traversal.
408	<	* When there are no lock acquisition failures, this is arranged
409	<	* simply by proceeding from the last bin (table.length - 1) up
410	<	* towards the first.  Upon seeing a forwarding node, traversals
411	<	* (see class InternalIterator) arrange to move to the new table
412	<	* without revisiting nodes.  However, when any node is skipped
413	<	* during a transfer, all earlier table bins may have become
414	<	* visible, so are initialized with a reverse-forwarding node back
415	<	* to the old table until the new ones are established. (This
416	<	* sometimes requires transiently locking a forwarding node, which
417	<	* is possible under the above encoding.) These more expensive
418	<	* mechanics trigger only when necessary.
382	>	* threshold (nominally, 0.75, but see below).  Any thread
383	>	* noticing an overfull bin may assist in resizing after the
384	>	* initiating thread allocates and sets up the replacement array.
385	>	* However, rather than stalling, these other threads may proceed
386	>	* with insertions etc.  The use of TreeBins shields us from the
387	>	* worst case effects of overfilling while resizes are in
388	>	* progress.  Resizing proceeds by transferring bins, one by one,
389	>	* from the table to the next table. However, threads claim small
390	>	* blocks of indices to transfer (via field transferIndex) before
391	>	* doing so, reducing contention.  A generation stamp in field
392	>	* sizeCtl ensures that resizings do not overlap. Because we are
393	>	* using power-of-two expansion, the elements from each bin must
394	>	* either stay at same index, or move with a power of two
395	>	* offset. We eliminate unnecessary node creation by catching
396	>	* cases where old nodes can be reused because their next fields
397	>	* won't change.  On average, only about one-sixth of them need
398	>	* cloning when a table doubles. The nodes they replace will be
399	>	* garbage collectable as soon as they are no longer referenced by
400	>	* any reader thread that may be in the midst of concurrently
401	>	* traversing table.  Upon transfer, the old table bin contains
402	>	* only a special forwarding node (with hash field "MOVED") that
403	>	* contains the next table as its key. On encountering a
404	>	* forwarding node, access and update operations restart, using
405	>	* the new table.
406	>	*
407	>	* Each bin transfer requires its bin lock, which can stall
408	>	* waiting for locks while resizing. However, because other
409	>	* threads can join in and help resize rather than contend for
410	>	* locks, average aggregate waits become shorter as resizing
411	>	* progresses.  The transfer operation must also ensure that all
412	>	* accessible bins in both the old and new table are usable by any
413	>	* traversal.  This is arranged in part by proceeding from the
414	>	* last bin (table.length - 1) up towards the first.  Upon seeing
415	>	* a forwarding node, traversals (see class Traverser) arrange to
416	>	* move to the new table without revisiting nodes.  To ensure that
417	>	* no intervening nodes are skipped even when moved out of order,
418	>	* a stack (see class TableStack) is created on first encounter of
419	>	* a forwarding node during a traversal, to maintain its place if
420	>	* later processing the current table. The need for these
421	>	* save/restore mechanics is relatively rare, but when one
422	>	* forwarding node is encountered, typically many more will be.
423	>	* So Traversers use a simple caching scheme to avoid creating so
424	>	* many new TableStack nodes. (Thanks to Peter Levart for
425	>	* suggesting use of a stack here.)
426		*
427		* The traversal scheme also applies to partial traversals of
428	<	* ranges of bins (via an alternate InternalIterator constructor)
428	>	* ranges of bins (via an alternate Traverser constructor)
429		* to support partitioned aggregate operations.  Also, read-only
430		* operations give up if ever forwarded to a null table, which
431		* provides support for shutdown-style clearing, which is also not
#	Line 382 | Line 437 | public class ConcurrentHashMapV8<K, V>
437		* These cases attempt to override the initial capacity settings,
438		* but harmlessly fail to take effect in cases of races.
439		*
440	<	* The element count is maintained using a LongAdder, which avoids
441	<	* contention on updates but can encounter cache thrashing if read
442	<	* too frequently during concurrent access. To avoid reading so
443	<	* often, resizing is attempted either when a bin lock is
444	<	* contended, or upon adding to a bin already holding two or more
445	<	* nodes (checked before adding in the xIfAbsent methods, after
446	<	* adding in others). Under uniform hash distributions, the
447	<	* probability of this occurring at threshold is around 13%,
448	<	* meaning that only about 1 in 8 puts check threshold (and after
449	<	* resizing, many fewer do so). But this approximation has high
450	<	* variance for small table sizes, so we check on any collision
451	<	* for sizes <= 64. The bulk putAll operation further reduces
452	<	* contention by only committing count updates upon these size
453	<	* checks.
440	>	* The element count is maintained using a specialization of
441	>	* LongAdder. We need to incorporate a specialization rather than
442	>	* just use a LongAdder in order to access implicit
443	>	* contention-sensing that leads to creation of multiple
444	>	* CounterCells.  The counter mechanics avoid contention on
445	>	* updates but can encounter cache thrashing if read too
446	>	* frequently during concurrent access. To avoid reading so often,
447	>	* resizing under contention is attempted only upon adding to a
448	>	* bin already holding two or more nodes. Under uniform hash
449	>	* distributions, the probability of this occurring at threshold
450	>	* is around 13%, meaning that only about 1 in 8 puts check
451	>	* threshold (and after resizing, many fewer do so).
452	>	*
453	>	* TreeBins use a special form of comparison for search and
454	>	* related operations (which is the main reason we cannot use
455	>	* existing collections such as TreeMaps). TreeBins contain
456	>	* Comparable elements, but may contain others, as well as
457	>	* elements that are Comparable but not necessarily Comparable for
458	>	* the same T, so we cannot invoke compareTo among them. To handle
459	>	* this, the tree is ordered primarily by hash value, then by
460	>	* Comparable.compareTo order if applicable.  On lookup at a node,
461	>	* if elements are not comparable or compare as 0 then both left
462	>	* and right children may need to be searched in the case of tied
463	>	* hash values. (This corresponds to the full list search that
464	>	* would be necessary if all elements were non-Comparable and had
465	>	* tied hashes.) On insertion, to keep a total ordering (or as
466	>	* close as is required here) across rebalancings, we compare
467	>	* classes and identityHashCodes as tie-breakers. The red-black
468	>	* balancing code is updated from pre-jdk-collections
469	>	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
470	>	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
471	>	* Algorithms" (CLR).
472	>	*
473	>	* TreeBins also require an additional locking mechanism.  While
474	>	* list traversal is always possible by readers even during
475	>	* updates, tree traversal is not, mainly because of tree-rotations
476	>	* that may change the root node and/or its linkages.  TreeBins
477	>	* include a simple read-write lock mechanism parasitic on the
478	>	* main bin-synchronization strategy: Structural adjustments
479	>	* associated with an insertion or removal are already bin-locked
480	>	* (and so cannot conflict with other writers) but must wait for
481	>	* ongoing readers to finish. Since there can be only one such
482	>	* waiter, we use a simple scheme using a single "waiter" field to
483	>	* block writers.  However, readers need never block.  If the root
484	>	* lock is held, they proceed along the slow traversal path (via
485	>	* next-pointers) until the lock becomes available or the list is
486	>	* exhausted, whichever comes first. These cases are not fast, but
487	>	* maximize aggregate expected throughput.
488		*
489		* Maintaining API and serialization compatibility with previous
490		* versions of this class introduces several oddities. Mainly: We
#	Line 405 | Line 494 | public class ConcurrentHashMapV8<K, V>
494		* time that we can guarantee to honor it.) We also declare an
495		* unused "Segment" class that is instantiated in minimal form
496		* only when serializing.
497	+	*
498	+	* Also, solely for compatibility with previous versions of this
499	+	* class, it extends AbstractMap, even though all of its methods
500	+	* are overridden, so it is just useless baggage.
501	+	*
502	+	* This file is organized to make things a little easier to follow
503	+	* while reading than they might otherwise: First the main static
504	+	* declarations and utilities, then fields, then main public
505	+	* methods (with a few factorings of multiple public methods into
506	+	* internal ones), then sizing methods, trees, traversers, and
507	+	* bulk operations.
508		*/
509
510		/* ---------------- Constants -------------- */
#	Line 446 | Line 546 | public class ConcurrentHashMapV8<K, V>
546		private static final float LOAD_FACTOR = 0.75f;
547
548		/**
549	<	* The buffer size for skipped bins during transfers. The
550	<	* value is arbitrary but should be large enough to avoid
551	<	* most locking stalls during resizes.
549	>	* The bin count threshold for using a tree rather than list for a
550	>	* bin.  Bins are converted to trees when adding an element to a
551	>	* bin with at least this many nodes. The value must be greater
552	>	* than 2, and should be at least 8 to mesh with assumptions in
553	>	* tree removal about conversion back to plain bins upon
554	>	* shrinkage.
555		*/
556	<	private static final int TRANSFER_BUFFER_SIZE = 32;
556	>	static final int TREEIFY_THRESHOLD = 8;
557
558		/**
559	<	* The bin count threshold for using a tree rather than list for a
560	<	* bin.  The value reflects the approximate break-even point for
561	<	* using tree-based operations.
559	>	* The bin count threshold for untreeifying a (split) bin during a
560	>	* resize operation. Should be less than TREEIFY_THRESHOLD, and at
561	>	* most 6 to mesh with shrinkage detection under removal.
562		*/
563	<	private static final int TREE_THRESHOLD = 8;
563	>	static final int UNTREEIFY_THRESHOLD = 6;
564
565	<	/*
566	<	* Encodings for special uses of Node hash fields. See above for
567	<	* explanation.
565	>	/**
566	>	* The smallest table capacity for which bins may be treeified.
567	>	* (Otherwise the table is resized if too many nodes in a bin.)
568	>	* The value should be at least 4 * TREEIFY_THRESHOLD to avoid
569	>	* conflicts between resizing and treeification thresholds.
570		*/
571	<	static final int MOVED     = 0x80000000; // hash field for forwarding nodes
467	<	static final int LOCKED    = 0x40000000; // set/tested only as a bit
468	<	static final int WAITING   = 0xc0000000; // both bits set/tested together
469	<	static final int HASH_BITS = 0x3fffffff; // usable bits of normal node hash
470	<
471	<	/* ---------------- Fields -------------- */
571	>	static final int MIN_TREEIFY_CAPACITY = 64;
572
573		/**
574	<	* The array of bins. Lazily initialized upon first insertion.
575	<	* Size is always a power of two. Accessed directly by iterators.
574	>	* Minimum number of rebinnings per transfer step. Ranges are
575	>	* subdivided to allow multiple resizer threads.  This value
576	>	* serves as a lower bound to avoid resizers encountering
577	>	* excessive memory contention.  The value should be at least
578	>	* DEFAULT_CAPACITY.
579		*/
580	<	transient volatile Node[] table;
580	>	private static final int MIN_TRANSFER_STRIDE = 16;
581
582		/**
583	<	* The counter maintaining number of elements.
583	>	* The number of bits used for generation stamp in sizeCtl.
584	>	* Must be at least 6 for 32bit arrays.
585		*/
586	<	private transient final LongAdder counter;
586	>	private static int RESIZE_STAMP_BITS = 16;
587
588		/**
589	<	* Table initialization and resizing control.  When negative, the
590	<	* table is being initialized or resized. Otherwise, when table is
487	<	* null, holds the initial table size to use upon creation, or 0
488	<	* for default. After initialization, holds the next element count
489	<	* value upon which to resize the table.
589	>	* The maximum number of threads that can help resize.
590	>	* Must fit in 32 - RESIZE_STAMP_BITS bits.
591		*/
592	<	private transient volatile int sizeCtl;
492	<
493	<	// views
494	<	private transient KeySet<K,V> keySet;
495	<	private transient Values<K,V> values;
496	<	private transient EntrySet<K,V> entrySet;
592	>	private static final int MAX_RESIZERS = (1 << (32 - RESIZE_STAMP_BITS)) - 1;
593
594	<	/** For serialization compatibility. Null unless serialized; see below */
595	<	private Segment<K,V>[] segments;
596	<
597	<	/* ---------------- Table element access -------------- */
594	>	/**
595	>	* The bit shift for recording size stamp in sizeCtl.
596	>	*/
597	>	private static final int RESIZE_STAMP_SHIFT = 32 - RESIZE_STAMP_BITS;
598
599		/*
600	<	* Volatile access methods are used for table elements as well as
505	<	* elements of in-progress next table while resizing.  Uses are
506	<	* null checked by callers, and implicitly bounds-checked, relying
507	<	* on the invariants that tab arrays have non-zero size, and all
508	<	* indices are masked with (tab.length - 1) which is never
509	<	* negative and always less than length. Note that, to be correct
510	<	* wrt arbitrary concurrency errors by users, bounds checks must
511	<	* operate on local variables, which accounts for some odd-looking
512	<	* inline assignments below.
600	>	* Encodings for Node hash fields. See above for explanation.
601		*/
602	<
603	<	static final Node tabAt(Node[] tab, int i) { // used by InternalIterator
604	<	return (Node)UNSAFE.getObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE);
605	<	}
606	<
607	<	private static final boolean casTabAt(Node[] tab, int i, Node c, Node v) {
608	<	return UNSAFE.compareAndSwapObject(tab, ((long)i<<ASHIFT)+ABASE, c, v);
609	<	}
610	<
611	<	private static final void setTabAt(Node[] tab, int i, Node v) {
612	<	UNSAFE.putObjectVolatile(tab, ((long)i<<ASHIFT)+ABASE, v);
613	<	}
602	>	static final int MOVED     = -1; // hash for forwarding nodes
603	>	static final int TREEBIN   = -2; // hash for roots of trees
604	>	static final int RESERVED  = -3; // hash for transient reservations
605	>	static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash
606	>
607	>	/** Number of CPUS, to place bounds on some sizings */
608	>	static final int NCPU = Runtime.getRuntime().availableProcessors();
609	>
610	>	/** For serialization compatibility. */
611	>	private static final ObjectStreamField[] serialPersistentFields = {
612	>	new ObjectStreamField("segments", Segment[].class),
613	>	new ObjectStreamField("segmentMask", Integer.TYPE),
614	>	new ObjectStreamField("segmentShift", Integer.TYPE)
615	>	};
616
617		/* ---------------- Nodes -------------- */
618
619		/**
620	<	* Key-value entry. Note that this is never exported out as a
621	<	* user-visible Map.Entry (see MapEntry below). Nodes with a hash
622	<	* field of MOVED are special, and do not contain user keys or
623	<	* values.  Otherwise, keys are never null, and null val fields
624	<	* indicate that a node is in the process of being deleted or
625	<	* created. For purposes of read-only access, a key may be read
626	<	* before a val, but can only be used after checking val to be
627	<	* non-null.
628	<	*/
629	<	static class Node {
630	<	volatile int hash;
631	<	final Object key;
542	<	volatile Object val;
543	<	volatile Node next;
620	>	* Key-value entry.  This class is never exported out as a
621	>	* user-mutable Map.Entry (i.e., one supporting setValue; see
622	>	* MapEntry below), but can be used for read-only traversals used
623	>	* in bulk tasks.  Subclasses of Node with a negative hash field
624	>	* are special, and contain null keys and values (but are never
625	>	* exported).  Otherwise, keys and vals are never null.
626	>	*/
627	>	static class Node<K,V> implements Map.Entry<K,V> {
628	>	final int hash;
629	>	final K key;
630	>	volatile V val;
631	>	volatile Node<K,V> next;
632
633	<	Node(int hash, Object key, Object val, Node next) {
633	>	Node(int hash, K key, V val, Node<K,V> next) {
634		this.hash = hash;
635		this.key = key;
636		this.val = val;
637		this.next = next;
638		}
639
640	<	/** CompareAndSet the hash field */
641	<	final boolean casHash(int cmp, int val) {
642	<	return UNSAFE.compareAndSwapInt(this, hashOffset, cmp, val);
643	<	}
644	<
645	<	/** The number of spins before blocking for a lock */
558	<	static final int MAX_SPINS =
559	<	Runtime.getRuntime().availableProcessors() > 1 ? 64 : 1;
560	<
561	<	/**
562	<	* Spins a while if LOCKED bit set and this node is the first
563	<	* of its bin, and then sets WAITING bits on hash field and
564	<	* blocks (once) if they are still set.  It is OK for this
565	<	* method to return even if lock is not available upon exit,
566	<	* which enables these simple single-wait mechanics.
567	<	*
568	<	* The corresponding signalling operation is performed within
569	<	* callers: Upon detecting that WAITING has been set when
570	<	* unlocking lock (via a failed CAS from non-waiting LOCKED
571	<	* state), unlockers acquire the sync lock and perform a
572	<	* notifyAll.
573	<	*/
574	<	final void tryAwaitLock(Node[] tab, int i) {
575	<	if (tab != null && i >= 0 && i < tab.length) { // bounds check
576	<	int r = ThreadLocalRandom.current().nextInt(); // randomize spins
577	<	int spins = MAX_SPINS, h;
578	<	while (tabAt(tab, i) == this && ((h = hash) & LOCKED) != 0) {
579	<	if (spins >= 0) {
580	<	r ^= r << 1; r ^= r >>> 3; r ^= r << 10; // xorshift
581	<	if (r >= 0 && --spins == 0)
582	<	Thread.yield();  // yield before block
583	<	}
584	<	else if (casHash(h, h | WAITING)) {
585	<	synchronized (this) {
586	<	if (tabAt(tab, i) == this &&
587	<	(hash & WAITING) == WAITING) {
588	<	try {
589	<	wait();
590	<	} catch (InterruptedException ie) {
591	<	Thread.currentThread().interrupt();
592	<	}
593	<	}
594	<	else
595	<	notifyAll(); // possibly won race vs signaller
596	<	}
597	<	break;
598	<	}
599	<	}
600	<	}
601	<	}
602	<
603	<	// Unsafe mechanics for casHash
604	<	private static final sun.misc.Unsafe UNSAFE;
605	<	private static final long hashOffset;
606	<
607	<	static {
608	<	try {
609	<	UNSAFE = getUnsafe();
610	<	Class<?> k = Node.class;
611	<	hashOffset = UNSAFE.objectFieldOffset
612	<	(k.getDeclaredField("hash"));
613	<	} catch (Exception e) {
614	<	throw new Error(e);
615	<	}
616	<	}
617	<	}
618	<
619	<	/* ---------------- TreeBins -------------- */
620	<
621	<	/**
622	<	* Nodes for use in TreeBins
623	<	*/
624	<	static final class TreeNode extends Node {
625	<	TreeNode parent;  // red-black tree links
626	<	TreeNode left;
627	<	TreeNode right;
628	<	TreeNode prev;    // needed to unlink next upon deletion
629	<	boolean red;
630	<
631	<	TreeNode(int hash, Object key, Object val, Node next, TreeNode parent) {
632	<	super(hash, key, val, next);
633	<	this.parent = parent;
634	<	}
635	<	}
636	<
637	<	/**
638	<	* A specialized form of red-black tree for use in bins
639	<	* whose size exceeds a threshold.
640	<	*
641	<	* TreeBins use a special form of comparison for search and
642	<	* related operations (which is the main reason we cannot use
643	<	* existing collections such as TreeMaps). TreeBins contain
644	<	* Comparable elements, but may contain others, as well as
645	<	* elements that are Comparable but not necessarily Comparable<T>
646	<	* for the same T, so we cannot invoke compareTo among them. To
647	<	* handle this, the tree is ordered primarily by hash value, then
648	<	* by getClass().getName() order, and then by Comparator order
649	<	* among elements of the same class.  On lookup at a node, if
650	<	* elements are not comparable or compare as 0, both left and
651	<	* right children may need to be searched in the case of tied hash
652	<	* values. (This corresponds to the full list search that would be
653	<	* necessary if all elements were non-Comparable and had tied
654	<	* hashes.)  The red-black balancing code is updated from
655	<	* pre-jdk-collections
656	<	* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java)
657	<	* based in turn on Cormen, Leiserson, and Rivest "Introduction to
658	<	* Algorithms" (CLR).
659	<	*
660	<	* TreeBins also maintain a separate locking discipline than
661	<	* regular bins. Because they are forwarded via special MOVED
662	<	* nodes at bin heads (which can never change once established),
663	<	* we cannot use use those nodes as locks. Instead, TreeBin
664	<	* extends AbstractQueuedSynchronizer to support a simple form of
665	<	* read-write lock. For update operations and table validation,
666	<	* the exclusive form of lock behaves in the same way as bin-head
667	<	* locks. However, lookups use shared read-lock mechanics to allow
668	<	* multiple readers in the absence of writers.  Additionally,
669	<	* these lookups do not ever block: While the lock is not
670	<	* available, they proceed along the slow traversal path (via
671	<	* next-pointers) until the lock becomes available or the list is
672	<	* exhausted, whichever comes first. (These cases are not fast,
673	<	* but maximize aggregate expected throughput.)  The AQS mechanics
674	<	* for doing this are straightforward.  The lock state is held as
675	<	* AQS getState().  Read counts are negative; the write count (1)
676	<	* is positive.  There are no signalling preferences among readers
677	<	* and writers. Since we don't need to export full Lock API, we
678	<	* just override the minimal AQS methods and use them directly.
679	<	*/
680	<	static final class TreeBin extends AbstractQueuedSynchronizer {
681	<	private static final long serialVersionUID = 2249069246763182397L;
682	<	transient TreeNode root;  // root of tree
683	<	transient TreeNode first; // head of next-pointer list
684	<
685	<	/* AQS overrides */
686	<	public final boolean isHeldExclusively() { return getState() > 0; }
687	<	public final boolean tryAcquire(int ignore) {
688	<	if (compareAndSetState(0, 1)) {
689	<	setExclusiveOwnerThread(Thread.currentThread());
690	<	return true;
691	<	}
692	<	return false;
693	<	}
694	<	public final boolean tryRelease(int ignore) {
695	<	setExclusiveOwnerThread(null);
696	<	setState(0);
697	<	return true;
698	<	}
699	<	public final int tryAcquireShared(int ignore) {
700	<	for (int c;;) {
701	<	if ((c = getState()) > 0)
702	<	return -1;
703	<	if (compareAndSetState(c, c -1))
704	<	return 1;
705	<	}
706	<	}
707	<	public final boolean tryReleaseShared(int ignore) {
708	<	int c;
709	<	do {} while (!compareAndSetState(c = getState(), c + 1));
710	<	return c == -1;
711	<	}
712	<
713	<	/** From CLR */
714	<	private void rotateLeft(TreeNode p) {
715	<	if (p != null) {
716	<	TreeNode r = p.right, pp, rl;
717	<	if ((rl = p.right = r.left) != null)
718	<	rl.parent = p;
719	<	if ((pp = r.parent = p.parent) == null)
720	<	root = r;
721	<	else if (pp.left == p)
722	<	pp.left = r;
723	<	else
724	<	pp.right = r;
725	<	r.left = p;
726	<	p.parent = r;
727	<	}
728	<	}
729	<
730	<	/** From CLR */
731	<	private void rotateRight(TreeNode p) {
732	<	if (p != null) {
733	<	TreeNode l = p.left, pp, lr;
734	<	if ((lr = p.left = l.right) != null)
735	<	lr.parent = p;
736	<	if ((pp = l.parent = p.parent) == null)
737	<	root = l;
738	<	else if (pp.right == p)
739	<	pp.right = l;
740	<	else
741	<	pp.left = l;
742	<	l.right = p;
743	<	p.parent = l;
744	<	}
745	<	}
746	<
747	<	/**
748	<	* Return the TreeNode (or null if not found) for the given key
749	<	* starting at given root.
750	<	*/
751	<	@SuppressWarnings("unchecked") // suppress Comparable cast warning
752	<	final TreeNode getTreeNode(int h, Object k, TreeNode p) {
753	<	Class<?> c = k.getClass();
754	<	while (p != null) {
755	<	int dir, ph;  Object pk; Class<?> pc;
756	<	if ((ph = p.hash) == h) {
757	<	if ((pk = p.key) == k || k.equals(pk))
758	<	return p;
759	<	if (c != (pc = pk.getClass()) ||
760	<	!(k instanceof Comparable) ||
761	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
762	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
763	<	TreeNode r = null, s = null, pl, pr;
764	<	if (dir >= 0) {
765	<	if ((pl = p.left) != null && h <= pl.hash)
766	<	s = pl;
767	<	}
768	<	else if ((pr = p.right) != null && h >= pr.hash)
769	<	s = pr;
770	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
771	<	return r;
772	<	}
773	<	}
774	<	else
775	<	dir = (h < ph) ? -1 : 1;
776	<	p = (dir > 0) ? p.right : p.left;
777	<	}
778	<	return null;
640	>	public final K getKey()       { return key; }
641	>	public final V getValue()     { return val; }
642	>	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
643	>	public final String toString(){ return key + "=" + val; }
644	>	public final V setValue(V value) {
645	>	throw new UnsupportedOperationException();
646		}
647
648	<	/**
649	<	* Wrapper for getTreeNode used by CHM.get. Tries to obtain
650	<	* read-lock to call getTreeNode, but during failure to get
651	<	* lock, searches along next links.
652	<	*/
653	<	final Object getValue(int h, Object k) {
654	<	Node r = null;
788	<	int c = getState(); // Must read lock state first
789	<	for (Node e = first; e != null; e = e.next) {
790	<	if (c <= 0 && compareAndSetState(c, c - 1)) {
791	<	try {
792	<	r = getTreeNode(h, k, root);
793	<	} finally {
794	<	releaseShared(0);
795	<	}
796	<	break;
797	<	}
798	<	else if ((e.hash & HASH_BITS) == h && k.equals(e.key)) {
799	<	r = e;
800	<	break;
801	<	}
802	<	else
803	<	c = getState();
804	<	}
805	<	return r == null ? null : r.val;
648	>	public final boolean equals(Object o) {
649	>	Object k, v, u; Map.Entry<?,?> e;
650	>	return ((o instanceof Map.Entry) &&
651	>	(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
652	>	(v = e.getValue()) != null &&
653	>	(k == key || k.equals(key)) &&
654	>	(v == (u = val) || v.equals(u)));
655		}
656
657		/**
658	<	* Find or add a node
810	<	* @return null if added
658	>	* Virtualized support for map.get(); overridden in subclasses.
659		*/
660	<	@SuppressWarnings("unchecked") // suppress Comparable cast warning
661	<	final TreeNode putTreeNode(int h, Object k, Object v) {
662	<	Class<?> c = k.getClass();
663	<	TreeNode pp = root, p = null;
664	<	int dir = 0;
665	<	while (pp != null) { // find existing node or leaf to insert at
666	<	int ph;  Object pk; Class<?> pc;
667	<	p = pp;
668	<	if ((ph = p.hash) == h) {
821	<	if ((pk = p.key) == k || k.equals(pk))
822	<	return p;
823	<	if (c != (pc = pk.getClass()) ||
824	<	!(k instanceof Comparable) ||
825	<	(dir = ((Comparable)k).compareTo((Comparable)pk)) == 0) {
826	<	dir = (c == pc) ? 0 : c.getName().compareTo(pc.getName());
827	<	TreeNode r = null, s = null, pl, pr;
828	<	if (dir >= 0) {
829	<	if ((pl = p.left) != null && h <= pl.hash)
830	<	s = pl;
831	<	}
832	<	else if ((pr = p.right) != null && h >= pr.hash)
833	<	s = pr;
834	<	if (s != null && (r = getTreeNode(h, k, s)) != null)
835	<	return r;
836	<	}
837	<	}
838	<	else
839	<	dir = (h < ph) ? -1 : 1;
840	<	pp = (dir > 0) ? p.right : p.left;
841	<	}
842	<
843	<	TreeNode f = first;
844	<	TreeNode x = first = new TreeNode(h, k, v, f, p);
845	<	if (p == null)
846	<	root = x;
847	<	else { // attach and rebalance; adapted from CLR
848	<	TreeNode xp, xpp;
849	<	if (f != null)
850	<	f.prev = x;
851	<	if (dir <= 0)
852	<	p.left = x;
853	<	else
854	<	p.right = x;
855	<	x.red = true;
856	<	while (x != null && (xp = x.parent) != null && xp.red &&
857	<	(xpp = xp.parent) != null) {
858	<	TreeNode xppl = xpp.left;
859	<	if (xp == xppl) {
860	<	TreeNode y = xpp.right;
861	<	if (y != null && y.red) {
862	<	y.red = false;
863	<	xp.red = false;
864	<	xpp.red = true;
865	<	x = xpp;
866	<	}
867	<	else {
868	<	if (x == xp.right) {
869	<	rotateLeft(x = xp);
870	<	xpp = (xp = x.parent) == null ? null : xp.parent;
871	<	}
872	<	if (xp != null) {
873	<	xp.red = false;
874	<	if (xpp != null) {
875	<	xpp.red = true;
876	<	rotateRight(xpp);
877	<	}
878	<	}
879	<	}
880	<	}
881	<	else {
882	<	TreeNode y = xppl;
883	<	if (y != null && y.red) {
884	<	y.red = false;
885	<	xp.red = false;
886	<	xpp.red = true;
887	<	x = xpp;
888	<	}
889	<	else {
890	<	if (x == xp.left) {
891	<	rotateRight(x = xp);
892	<	xpp = (xp = x.parent) == null ? null : xp.parent;
893	<	}
894	<	if (xp != null) {
895	<	xp.red = false;
896	<	if (xpp != null) {
897	<	xpp.red = true;
898	<	rotateLeft(xpp);
899	<	}
900	<	}
901	<	}
902	<	}
903	<	}
904	<	TreeNode r = root;
905	<	if (r != null && r.red)
906	<	r.red = false;
660	>	Node<K,V> find(int h, Object k) {
661	>	Node<K,V> e = this;
662	>	if (k != null) {
663	>	do {
664	>	K ek;
665	>	if (e.hash == h &&
666	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
667	>	return e;
668	>	} while ((e = e.next) != null);
669		}
670		return null;
671		}
910	–
911	–	/**
912	–	* Removes the given node, that must be present before this
913	–	* call.  This is messier than typical red-black deletion code
914	–	* because we cannot swap the contents of an interior node
915	–	* with a leaf successor that is pinned by "next" pointers
916	–	* that are accessible independently of lock. So instead we
917	–	* swap the tree linkages.
918	–	*/
919	–	final void deleteTreeNode(TreeNode p) {
920	–	TreeNode next = (TreeNode)p.next; // unlink traversal pointers
921	–	TreeNode pred = p.prev;
922	–	if (pred == null)
923	–	first = next;
924	–	else
925	–	pred.next = next;
926	–	if (next != null)
927	–	next.prev = pred;
928	–	TreeNode replacement;
929	–	TreeNode pl = p.left;
930	–	TreeNode pr = p.right;
931	–	if (pl != null && pr != null) {
932	–	TreeNode s = pr, sl;
933	–	while ((sl = s.left) != null) // find successor
934	–	s = sl;
935	–	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
936	–	TreeNode sr = s.right;
937	–	TreeNode pp = p.parent;
938	–	if (s == pr) { // p was s's direct parent
939	–	p.parent = s;
940	–	s.right = p;
941	–	}
942	–	else {
943	–	TreeNode sp = s.parent;
944	–	if ((p.parent = sp) != null) {
945	–	if (s == sp.left)
946	–	sp.left = p;
947	–	else
948	–	sp.right = p;
949	–	}
950	–	if ((s.right = pr) != null)
951	–	pr.parent = s;
952	–	}
953	–	p.left = null;
954	–	if ((p.right = sr) != null)
955	–	sr.parent = p;
956	–	if ((s.left = pl) != null)
957	–	pl.parent = s;
958	–	if ((s.parent = pp) == null)
959	–	root = s;
960	–	else if (p == pp.left)
961	–	pp.left = s;
962	–	else
963	–	pp.right = s;
964	–	replacement = sr;
965	–	}
966	–	else
967	–	replacement = (pl != null) ? pl : pr;
968	–	TreeNode pp = p.parent;
969	–	if (replacement == null) {
970	–	if (pp == null) {
971	–	root = null;
972	–	return;
973	–	}
974	–	replacement = p;
975	–	}
976	–	else {
977	–	replacement.parent = pp;
978	–	if (pp == null)
979	–	root = replacement;
980	–	else if (p == pp.left)
981	–	pp.left = replacement;
982	–	else
983	–	pp.right = replacement;
984	–	p.left = p.right = p.parent = null;
985	–	}
986	–	if (!p.red) { // rebalance, from CLR
987	–	TreeNode x = replacement;
988	–	while (x != null) {
989	–	TreeNode xp, xpl;
990	–	if (x.red || (xp = x.parent) == null) {
991	–	x.red = false;
992	–	break;
993	–	}
994	–	if (x == (xpl = xp.left)) {
995	–	TreeNode sib = xp.right;
996	–	if (sib != null && sib.red) {
997	–	sib.red = false;
998	–	xp.red = true;
999	–	rotateLeft(xp);
1000	–	sib = (xp = x.parent) == null ? null : xp.right;
1001	–	}
1002	–	if (sib == null)
1003	–	x = xp;
1004	–	else {
1005	–	TreeNode sl = sib.left, sr = sib.right;
1006	–	if ((sr == null || !sr.red) &&
1007	–	(sl == null || !sl.red)) {
1008	–	sib.red = true;
1009	–	x = xp;
1010	–	}
1011	–	else {
1012	–	if (sr == null || !sr.red) {
1013	–	if (sl != null)
1014	–	sl.red = false;
1015	–	sib.red = true;
1016	–	rotateRight(sib);
1017	–	sib = (xp = x.parent) == null ? null : xp.right;
1018	–	}
1019	–	if (sib != null) {
1020	–	sib.red = (xp == null) ? false : xp.red;
1021	–	if ((sr = sib.right) != null)
1022	–	sr.red = false;
1023	–	}
1024	–	if (xp != null) {
1025	–	xp.red = false;
1026	–	rotateLeft(xp);
1027	–	}
1028	–	x = root;
1029	–	}
1030	–	}
1031	–	}
1032	–	else { // symmetric
1033	–	TreeNode sib = xpl;
1034	–	if (sib != null && sib.red) {
1035	–	sib.red = false;
1036	–	xp.red = true;
1037	–	rotateRight(xp);
1038	–	sib = (xp = x.parent) == null ? null : xp.left;
1039	–	}
1040	–	if (sib == null)
1041	–	x = xp;
1042	–	else {
1043	–	TreeNode sl = sib.left, sr = sib.right;
1044	–	if ((sl == null || !sl.red) &&
1045	–	(sr == null || !sr.red)) {
1046	–	sib.red = true;
1047	–	x = xp;
1048	–	}
1049	–	else {
1050	–	if (sl == null || !sl.red) {
1051	–	if (sr != null)
1052	–	sr.red = false;
1053	–	sib.red = true;
1054	–	rotateLeft(sib);
1055	–	sib = (xp = x.parent) == null ? null : xp.left;
1056	–	}
1057	–	if (sib != null) {
1058	–	sib.red = (xp == null) ? false : xp.red;
1059	–	if ((sl = sib.left) != null)
1060	–	sl.red = false;
1061	–	}
1062	–	if (xp != null) {
1063	–	xp.red = false;
1064	–	rotateRight(xp);
1065	–	}
1066	–	x = root;
1067	–	}
1068	–	}
1069	–	}
1070	–	}
1071	–	}
1072	–	if (p == replacement && (pp = p.parent) != null) {
1073	–	if (p == pp.left) // detach pointers
1074	–	pp.left = null;
1075	–	else if (p == pp.right)
1076	–	pp.right = null;
1077	–	p.parent = null;
1078	–	}
1079	–	}
672		}
673
674	<	/* ---------------- Collision reduction methods -------------- */
674	>	/* ---------------- Static utilities -------------- */
675
676		/**
677	<	* Spreads higher bits to lower, and also forces top 2 bits to 0.
678	<	* Because the table uses power-of-two masking, sets of hashes
679	<	* that vary only in bits above the current mask will always
680	<	* collide. (Among known examples are sets of Float keys holding
681	<	* consecutive whole numbers in small tables.)  To counter this,
682	<	* we apply a transform that spreads the impact of higher bits
677	>	* Spreads (XORs) higher bits of hash to lower and also forces top
678	>	* bit to 0. Because the table uses power-of-two masking, sets of
679	>	* hashes that vary only in bits above the current mask will
680	>	* always collide. (Among known examples are sets of Float keys
681	>	* holding consecutive whole numbers in small tables.)  So we
682	>	* apply a transform that spreads the impact of higher bits
683		* downward. There is a tradeoff between speed, utility, and
684		* quality of bit-spreading. Because many common sets of hashes
685	<	* are already reasonably distributed across bits (so don't benefit
686	<	* from spreading), and because we use trees to handle large sets
687	<	* of collisions in bins, we don't need excessively high quality.
688	<	*/
689	<	private static final int spread(int h) {
690	<	h ^= (h >>> 18) ^ (h >>> 12);
1099	<	return (h ^ (h >>> 10)) & HASH_BITS;
1100	<	}
1101	<
1102	<	/**
1103	<	* Replaces a list bin with a tree bin. Call only when locked.
1104	<	* Fails to replace if the given key is non-comparable or table
1105	<	* is, or needs, resizing.
685	>	* are already reasonably distributed (so don't benefit from
686	>	* spreading), and because we use trees to handle large sets of
687	>	* collisions in bins, we just XOR some shifted bits in the
688	>	* cheapest possible way to reduce systematic lossage, as well as
689	>	* to incorporate impact of the highest bits that would otherwise
690	>	* never be used in index calculations because of table bounds.
691		*/
692	<	private final void replaceWithTreeBin(Node[] tab, int index, Object key) {
693	<	if ((key instanceof Comparable) &&
1109	<	(tab.length >= MAXIMUM_CAPACITY || counter.sum() < (long)sizeCtl)) {
1110	<	TreeBin t = new TreeBin();
1111	<	for (Node e = tabAt(tab, index); e != null; e = e.next)
1112	<	t.putTreeNode(e.hash & HASH_BITS, e.key, e.val);
1113	<	setTabAt(tab, index, new Node(MOVED, t, null, null));
1114	<	}
1115	<	}
1116	<
1117	<	/* ---------------- Internal access and update methods -------------- */
1118	<
1119	<	/** Implementation for get and containsKey */
1120	<	private final Object internalGet(Object k) {
1121	<	int h = spread(k.hashCode());
1122	<	retry: for (Node[] tab = table; tab != null;) {
1123	<	Node e, p; Object ek, ev; int eh;      // locals to read fields once
1124	<	for (e = tabAt(tab, (tab.length - 1) & h); e != null; e = e.next) {
1125	<	if ((eh = e.hash) == MOVED) {
1126	<	if ((ek = e.key) instanceof TreeBin)  // search TreeBin
1127	<	return ((TreeBin)ek).getValue(h, k);
1128	<	else {                        // restart with new table
1129	<	tab = (Node[])ek;
1130	<	continue retry;
1131	<	}
1132	<	}
1133	<	else if ((eh & HASH_BITS) == h && (ev = e.val) != null &&
1134	<	((ek = e.key) == k || k.equals(ek)))
1135	<	return ev;
1136	<	}
1137	<	break;
1138	<	}
1139	<	return null;
1140	<	}
1141	<
1142	<	/**
1143	<	* Implementation for the four public remove/replace methods:
1144	<	* Replaces node value with v, conditional upon match of cv if
1145	<	* non-null.  If resulting value is null, delete.
1146	<	*/
1147	<	private final Object internalReplace(Object k, Object v, Object cv) {
1148	<	int h = spread(k.hashCode());
1149	<	Object oldVal = null;
1150	<	for (Node[] tab = table;;) {
1151	<	Node f; int i, fh; Object fk;
1152	<	if (tab == null ||
1153	<	(f = tabAt(tab, i = (tab.length - 1) & h)) == null)
1154	<	break;
1155	<	else if ((fh = f.hash) == MOVED) {
1156	<	if ((fk = f.key) instanceof TreeBin) {
1157	<	TreeBin t = (TreeBin)fk;
1158	<	boolean validated = false;
1159	<	boolean deleted = false;
1160	<	t.acquire(0);
1161	<	try {
1162	<	if (tabAt(tab, i) == f) {
1163	<	validated = true;
1164	<	TreeNode p = t.getTreeNode(h, k, t.root);
1165	<	if (p != null) {
1166	<	Object pv = p.val;
1167	<	if (cv == null || cv == pv || cv.equals(pv)) {
1168	<	oldVal = pv;
1169	<	if ((p.val = v) == null) {
1170	<	deleted = true;
1171	<	t.deleteTreeNode(p);
1172	<	}
1173	<	}
1174	<	}
1175	<	}
1176	<	} finally {
1177	<	t.release(0);
1178	<	}
1179	<	if (validated) {
1180	<	if (deleted)
1181	<	counter.add(-1L);
1182	<	break;
1183	<	}
1184	<	}
1185	<	else
1186	<	tab = (Node[])fk;
1187	<	}
1188	<	else if ((fh & HASH_BITS) != h && f.next == null) // precheck
1189	<	break;                          // rules out possible existence
1190	<	else if ((fh & LOCKED) != 0) {
1191	<	checkForResize();               // try resizing if can't get lock
1192	<	f.tryAwaitLock(tab, i);
1193	<	}
1194	<	else if (f.casHash(fh, fh | LOCKED)) {
1195	<	boolean validated = false;
1196	<	boolean deleted = false;
1197	<	try {
1198	<	if (tabAt(tab, i) == f) {
1199	<	validated = true;
1200	<	for (Node e = f, pred = null;;) {
1201	<	Object ek, ev;
1202	<	if ((e.hash & HASH_BITS) == h &&
1203	<	((ev = e.val) != null) &&
1204	<	((ek = e.key) == k || k.equals(ek))) {
1205	<	if (cv == null || cv == ev || cv.equals(ev)) {
1206	<	oldVal = ev;
1207	<	if ((e.val = v) == null) {
1208	<	deleted = true;
1209	<	Node en = e.next;
1210	<	if (pred != null)
1211	<	pred.next = en;
1212	<	else
1213	<	setTabAt(tab, i, en);
1214	<	}
1215	<	}
1216	<	break;
1217	<	}
1218	<	pred = e;
1219	<	if ((e = e.next) == null)
1220	<	break;
1221	<	}
1222	<	}
1223	<	} finally {
1224	<	if (!f.casHash(fh | LOCKED, fh)) {
1225	<	f.hash = fh;
1226	<	synchronized (f) { f.notifyAll(); };
1227	<	}
1228	<	}
1229	<	if (validated) {
1230	<	if (deleted)
1231	<	counter.add(-1L);
1232	<	break;
1233	<	}
1234	<	}
1235	<	}
1236	<	return oldVal;
1237	<	}
1238	<
1239	<	/*
1240	<	* Internal versions of the five insertion methods, each a
1241	<	* little more complicated than the last. All have
1242	<	* the same basic structure as the first (internalPut):
1243	<	*  1. If table uninitialized, create
1244	<	*  2. If bin empty, try to CAS new node
1245	<	*  3. If bin stale, use new table
1246	<	*  4. if bin converted to TreeBin, validate and relay to TreeBin methods
1247	<	*  5. Lock and validate; if valid, scan and add or update
1248	<	*
1249	<	* The others interweave other checks and/or alternative actions:
1250	<	*  * Plain put checks for and performs resize after insertion.
1251	<	*  * putIfAbsent prescans for mapping without lock (and fails to add
1252	<	*    if present), which also makes pre-emptive resize checks worthwhile.
1253	<	*  * computeIfAbsent extends form used in putIfAbsent with additional
1254	<	*    mechanics to deal with, calls, potential exceptions and null
1255	<	*    returns from function call.
1256	<	*  * compute uses the same function-call mechanics, but without
1257	<	*    the prescans
1258	<	*  * putAll attempts to pre-allocate enough table space
1259	<	*    and more lazily performs count updates and checks.
1260	<	*
1261	<	* Someday when details settle down a bit more, it might be worth
1262	<	* some factoring to reduce sprawl.
1263	<	*/
1264	<
1265	<	/** Implementation for put */
1266	<	private final Object internalPut(Object k, Object v) {
1267	<	int h = spread(k.hashCode());
1268	<	int count = 0;
1269	<	for (Node[] tab = table;;) {
1270	<	int i; Node f; int fh; Object fk;
1271	<	if (tab == null)
1272	<	tab = initTable();
1273	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1274	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1275	<	break;                   // no lock when adding to empty bin
1276	<	}
1277	<	else if ((fh = f.hash) == MOVED) {
1278	<	if ((fk = f.key) instanceof TreeBin) {
1279	<	TreeBin t = (TreeBin)fk;
1280	<	Object oldVal = null;
1281	<	t.acquire(0);
1282	<	try {
1283	<	if (tabAt(tab, i) == f) {
1284	<	count = 2;
1285	<	TreeNode p = t.putTreeNode(h, k, v);
1286	<	if (p != null) {
1287	<	oldVal = p.val;
1288	<	p.val = v;
1289	<	}
1290	<	}
1291	<	} finally {
1292	<	t.release(0);
1293	<	}
1294	<	if (count != 0) {
1295	<	if (oldVal != null)
1296	<	return oldVal;
1297	<	break;
1298	<	}
1299	<	}
1300	<	else
1301	<	tab = (Node[])fk;
1302	<	}
1303	<	else if ((fh & LOCKED) != 0) {
1304	<	checkForResize();
1305	<	f.tryAwaitLock(tab, i);
1306	<	}
1307	<	else if (f.casHash(fh, fh | LOCKED)) {
1308	<	Object oldVal = null;
1309	<	try {                        // needed in case equals() throws
1310	<	if (tabAt(tab, i) == f) {
1311	<	count = 1;
1312	<	for (Node e = f;; ++count) {
1313	<	Object ek, ev;
1314	<	if ((e.hash & HASH_BITS) == h &&
1315	<	(ev = e.val) != null &&
1316	<	((ek = e.key) == k || k.equals(ek))) {
1317	<	oldVal = ev;
1318	<	e.val = v;
1319	<	break;
1320	<	}
1321	<	Node last = e;
1322	<	if ((e = e.next) == null) {
1323	<	last.next = new Node(h, k, v, null);
1324	<	if (count >= TREE_THRESHOLD)
1325	<	replaceWithTreeBin(tab, i, k);
1326	<	break;
1327	<	}
1328	<	}
1329	<	}
1330	<	} finally {                  // unlock and signal if needed
1331	<	if (!f.casHash(fh | LOCKED, fh)) {
1332	<	f.hash = fh;
1333	<	synchronized (f) { f.notifyAll(); };
1334	<	}
1335	<	}
1336	<	if (count != 0) {
1337	<	if (oldVal != null)
1338	<	return oldVal;
1339	<	if (tab.length <= 64)
1340	<	count = 2;
1341	<	break;
1342	<	}
1343	<	}
1344	<	}
1345	<	counter.add(1L);
1346	<	if (count > 1)
1347	<	checkForResize();
1348	<	return null;
1349	<	}
1350	<
1351	<	/** Implementation for putIfAbsent */
1352	<	private final Object internalPutIfAbsent(Object k, Object v) {
1353	<	int h = spread(k.hashCode());
1354	<	int count = 0;
1355	<	for (Node[] tab = table;;) {
1356	<	int i; Node f; int fh; Object fk, fv;
1357	<	if (tab == null)
1358	<	tab = initTable();
1359	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1360	<	if (casTabAt(tab, i, null, new Node(h, k, v, null)))
1361	<	break;
1362	<	}
1363	<	else if ((fh = f.hash) == MOVED) {
1364	<	if ((fk = f.key) instanceof TreeBin) {
1365	<	TreeBin t = (TreeBin)fk;
1366	<	Object oldVal = null;
1367	<	t.acquire(0);
1368	<	try {
1369	<	if (tabAt(tab, i) == f) {
1370	<	count = 2;
1371	<	TreeNode p = t.putTreeNode(h, k, v);
1372	<	if (p != null)
1373	<	oldVal = p.val;
1374	<	}
1375	<	} finally {
1376	<	t.release(0);
1377	<	}
1378	<	if (count != 0) {
1379	<	if (oldVal != null)
1380	<	return oldVal;
1381	<	break;
1382	<	}
1383	<	}
1384	<	else
1385	<	tab = (Node[])fk;
1386	<	}
1387	<	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1388	<	((fk = f.key) == k || k.equals(fk)))
1389	<	return fv;
1390	<	else {
1391	<	Node g = f.next;
1392	<	if (g != null) { // at least 2 nodes -- search and maybe resize
1393	<	for (Node e = g;;) {
1394	<	Object ek, ev;
1395	<	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1396	<	((ek = e.key) == k || k.equals(ek)))
1397	<	return ev;
1398	<	if ((e = e.next) == null) {
1399	<	checkForResize();
1400	<	break;
1401	<	}
1402	<	}
1403	<	}
1404	<	if (((fh = f.hash) & LOCKED) != 0) {
1405	<	checkForResize();
1406	<	f.tryAwaitLock(tab, i);
1407	<	}
1408	<	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1409	<	Object oldVal = null;
1410	<	try {
1411	<	if (tabAt(tab, i) == f) {
1412	<	count = 1;
1413	<	for (Node e = f;; ++count) {
1414	<	Object ek, ev;
1415	<	if ((e.hash & HASH_BITS) == h &&
1416	<	(ev = e.val) != null &&
1417	<	((ek = e.key) == k || k.equals(ek))) {
1418	<	oldVal = ev;
1419	<	break;
1420	<	}
1421	<	Node last = e;
1422	<	if ((e = e.next) == null) {
1423	<	last.next = new Node(h, k, v, null);
1424	<	if (count >= TREE_THRESHOLD)
1425	<	replaceWithTreeBin(tab, i, k);
1426	<	break;
1427	<	}
1428	<	}
1429	<	}
1430	<	} finally {
1431	<	if (!f.casHash(fh | LOCKED, fh)) {
1432	<	f.hash = fh;
1433	<	synchronized (f) { f.notifyAll(); };
1434	<	}
1435	<	}
1436	<	if (count != 0) {
1437	<	if (oldVal != null)
1438	<	return oldVal;
1439	<	if (tab.length <= 64)
1440	<	count = 2;
1441	<	break;
1442	<	}
1443	<	}
1444	<	}
1445	<	}
1446	<	counter.add(1L);
1447	<	if (count > 1)
1448	<	checkForResize();
1449	<	return null;
1450	<	}
1451	<
1452	<	/** Implementation for computeIfAbsent */
1453	<	private final Object internalComputeIfAbsent(K k,
1454	<	MappingFunction<? super K, ?> mf) {
1455	<	int h = spread(k.hashCode());
1456	<	Object val = null;
1457	<	int count = 0;
1458	<	for (Node[] tab = table;;) {
1459	<	Node f; int i, fh; Object fk, fv;
1460	<	if (tab == null)
1461	<	tab = initTable();
1462	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1463	<	Node node = new Node(fh = h | LOCKED, k, null, null);
1464	<	if (casTabAt(tab, i, null, node)) {
1465	<	count = 1;
1466	<	try {
1467	<	if ((val = mf.map(k)) != null)
1468	<	node.val = val;
1469	<	} finally {
1470	<	if (val == null)
1471	<	setTabAt(tab, i, null);
1472	<	if (!node.casHash(fh, h)) {
1473	<	node.hash = h;
1474	<	synchronized (node) { node.notifyAll(); };
1475	<	}
1476	<	}
1477	<	}
1478	<	if (count != 0)
1479	<	break;
1480	<	}
1481	<	else if ((fh = f.hash) == MOVED) {
1482	<	if ((fk = f.key) instanceof TreeBin) {
1483	<	TreeBin t = (TreeBin)fk;
1484	<	boolean added = false;
1485	<	t.acquire(0);
1486	<	try {
1487	<	if (tabAt(tab, i) == f) {
1488	<	count = 1;
1489	<	TreeNode p = t.getTreeNode(h, k, t.root);
1490	<	if (p != null)
1491	<	val = p.val;
1492	<	else if ((val = mf.map(k)) != null) {
1493	<	added = true;
1494	<	count = 2;
1495	<	t.putTreeNode(h, k, val);
1496	<	}
1497	<	}
1498	<	} finally {
1499	<	t.release(0);
1500	<	}
1501	<	if (count != 0) {
1502	<	if (!added)
1503	<	return val;
1504	<	break;
1505	<	}
1506	<	}
1507	<	else
1508	<	tab = (Node[])fk;
1509	<	}
1510	<	else if ((fh & HASH_BITS) == h && (fv = f.val) != null &&
1511	<	((fk = f.key) == k || k.equals(fk)))
1512	<	return fv;
1513	<	else {
1514	<	Node g = f.next;
1515	<	if (g != null) {
1516	<	for (Node e = g;;) {
1517	<	Object ek, ev;
1518	<	if ((e.hash & HASH_BITS) == h && (ev = e.val) != null &&
1519	<	((ek = e.key) == k || k.equals(ek)))
1520	<	return ev;
1521	<	if ((e = e.next) == null) {
1522	<	checkForResize();
1523	<	break;
1524	<	}
1525	<	}
1526	<	}
1527	<	if (((fh = f.hash) & LOCKED) != 0) {
1528	<	checkForResize();
1529	<	f.tryAwaitLock(tab, i);
1530	<	}
1531	<	else if (tabAt(tab, i) == f && f.casHash(fh, fh | LOCKED)) {
1532	<	boolean added = false;
1533	<	try {
1534	<	if (tabAt(tab, i) == f) {
1535	<	count = 1;
1536	<	for (Node e = f;; ++count) {
1537	<	Object ek, ev;
1538	<	if ((e.hash & HASH_BITS) == h &&
1539	<	(ev = e.val) != null &&
1540	<	((ek = e.key) == k || k.equals(ek))) {
1541	<	val = ev;
1542	<	break;
1543	<	}
1544	<	Node last = e;
1545	<	if ((e = e.next) == null) {
1546	<	if ((val = mf.map(k)) != null) {
1547	<	added = true;
1548	<	last.next = new Node(h, k, val, null);
1549	<	if (count >= TREE_THRESHOLD)
1550	<	replaceWithTreeBin(tab, i, k);
1551	<	}
1552	<	break;
1553	<	}
1554	<	}
1555	<	}
1556	<	} finally {
1557	<	if (!f.casHash(fh | LOCKED, fh)) {
1558	<	f.hash = fh;
1559	<	synchronized (f) { f.notifyAll(); };
1560	<	}
1561	<	}
1562	<	if (count != 0) {
1563	<	if (!added)
1564	<	return val;
1565	<	if (tab.length <= 64)
1566	<	count = 2;
1567	<	break;
1568	<	}
1569	<	}
1570	<	}
1571	<	}
1572	<	if (val != null) {
1573	<	counter.add(1L);
1574	<	if (count > 1)
1575	<	checkForResize();
1576	<	}
1577	<	return val;
1578	<	}
1579	<
1580	<	/** Implementation for compute */
1581	<	@SuppressWarnings("unchecked")
1582	<	private final Object internalCompute(K k,
1583	<	RemappingFunction<? super K, V> mf) {
1584	<	int h = spread(k.hashCode());
1585	<	Object val = null;
1586	<	int delta = 0;
1587	<	int count = 0;
1588	<	for (Node[] tab = table;;) {
1589	<	Node f; int i, fh; Object fk;
1590	<	if (tab == null)
1591	<	tab = initTable();
1592	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null) {
1593	<	Node node = new Node(fh = h | LOCKED, k, null, null);
1594	<	if (casTabAt(tab, i, null, node)) {
1595	<	try {
1596	<	count = 1;
1597	<	if ((val = mf.remap(k, null)) != null) {
1598	<	node.val = val;
1599	<	delta = 1;
1600	<	}
1601	<	} finally {
1602	<	if (delta == 0)
1603	<	setTabAt(tab, i, null);
1604	<	if (!node.casHash(fh, h)) {
1605	<	node.hash = h;
1606	<	synchronized (node) { node.notifyAll(); };
1607	<	}
1608	<	}
1609	<	}
1610	<	if (count != 0)
1611	<	break;
1612	<	}
1613	<	else if ((fh = f.hash) == MOVED) {
1614	<	if ((fk = f.key) instanceof TreeBin) {
1615	<	TreeBin t = (TreeBin)fk;
1616	<	t.acquire(0);
1617	<	try {
1618	<	if (tabAt(tab, i) == f) {
1619	<	count = 1;
1620	<	TreeNode p = t.getTreeNode(h, k, t.root);
1621	<	Object pv = (p == null) ? null : p.val;
1622	<	if ((val = mf.remap(k, (V)pv)) != null) {
1623	<	if (p != null)
1624	<	p.val = val;
1625	<	else {
1626	<	count = 2;
1627	<	delta = 1;
1628	<	t.putTreeNode(h, k, val);
1629	<	}
1630	<	}
1631	<	else if (p != null) {
1632	<	delta = -1;
1633	<	t.deleteTreeNode(p);
1634	<	}
1635	<	}
1636	<	} finally {
1637	<	t.release(0);
1638	<	}
1639	<	if (count != 0)
1640	<	break;
1641	<	}
1642	<	else
1643	<	tab = (Node[])fk;
1644	<	}
1645	<	else if ((fh & LOCKED) != 0) {
1646	<	checkForResize();
1647	<	f.tryAwaitLock(tab, i);
1648	<	}
1649	<	else if (f.casHash(fh, fh | LOCKED)) {
1650	<	try {
1651	<	if (tabAt(tab, i) == f) {
1652	<	count = 1;
1653	<	for (Node e = f, pred = null;; ++count) {
1654	<	Object ek, ev;
1655	<	if ((e.hash & HASH_BITS) == h &&
1656	<	(ev = e.val) != null &&
1657	<	((ek = e.key) == k || k.equals(ek))) {
1658	<	val = mf.remap(k, (V)ev);
1659	<	if (val != null)
1660	<	e.val = val;
1661	<	else {
1662	<	delta = -1;
1663	<	Node en = e.next;
1664	<	if (pred != null)
1665	<	pred.next = en;
1666	<	else
1667	<	setTabAt(tab, i, en);
1668	<	}
1669	<	break;
1670	<	}
1671	<	pred = e;
1672	<	if ((e = e.next) == null) {
1673	<	if ((val = mf.remap(k, null)) != null) {
1674	<	pred.next = new Node(h, k, val, null);
1675	<	delta = 1;
1676	<	if (count >= TREE_THRESHOLD)
1677	<	replaceWithTreeBin(tab, i, k);
1678	<	}
1679	<	break;
1680	<	}
1681	<	}
1682	<	}
1683	<	} finally {
1684	<	if (!f.casHash(fh | LOCKED, fh)) {
1685	<	f.hash = fh;
1686	<	synchronized (f) { f.notifyAll(); };
1687	<	}
1688	<	}
1689	<	if (count != 0) {
1690	<	if (tab.length <= 64)
1691	<	count = 2;
1692	<	break;
1693	<	}
1694	<	}
1695	<	}
1696	<	if (delta != 0) {
1697	<	counter.add((long)delta);
1698	<	if (count > 1)
1699	<	checkForResize();
1700	<	}
1701	<	return val;
1702	<	}
1703	<
1704	<	/** Implementation for putAll */
1705	<	private final void internalPutAll(Map<?, ?> m) {
1706	<	tryPresize(m.size());
1707	<	long delta = 0L;     // number of uncommitted additions
1708	<	boolean npe = false; // to throw exception on exit for nulls
1709	<	try {                // to clean up counts on other exceptions
1710	<	for (Map.Entry<?, ?> entry : m.entrySet()) {
1711	<	Object k, v;
1712	<	if (entry == null || (k = entry.getKey()) == null ||
1713	<	(v = entry.getValue()) == null) {
1714	<	npe = true;
1715	<	break;
1716	<	}
1717	<	int h = spread(k.hashCode());
1718	<	for (Node[] tab = table;;) {
1719	<	int i; Node f; int fh; Object fk;
1720	<	if (tab == null)
1721	<	tab = initTable();
1722	<	else if ((f = tabAt(tab, i = (tab.length - 1) & h)) == null){
1723	<	if (casTabAt(tab, i, null, new Node(h, k, v, null))) {
1724	<	++delta;
1725	<	break;
1726	<	}
1727	<	}
1728	<	else if ((fh = f.hash) == MOVED) {
1729	<	if ((fk = f.key) instanceof TreeBin) {
1730	<	TreeBin t = (TreeBin)fk;
1731	<	boolean validated = false;
1732	<	t.acquire(0);
1733	<	try {
1734	<	if (tabAt(tab, i) == f) {
1735	<	validated = true;
1736	<	TreeNode p = t.getTreeNode(h, k, t.root);
1737	<	if (p != null)
1738	<	p.val = v;
1739	<	else {
1740	<	t.putTreeNode(h, k, v);
1741	<	++delta;
1742	<	}
1743	<	}
1744	<	} finally {
1745	<	t.release(0);
1746	<	}
1747	<	if (validated)
1748	<	break;
1749	<	}
1750	<	else
1751	<	tab = (Node[])fk;
1752	<	}
1753	<	else if ((fh & LOCKED) != 0) {
1754	<	counter.add(delta);
1755	<	delta = 0L;
1756	<	checkForResize();
1757	<	f.tryAwaitLock(tab, i);
1758	<	}
1759	<	else if (f.casHash(fh, fh | LOCKED)) {
1760	<	int count = 0;
1761	<	try {
1762	<	if (tabAt(tab, i) == f) {
1763	<	count = 1;
1764	<	for (Node e = f;; ++count) {
1765	<	Object ek, ev;
1766	<	if ((e.hash & HASH_BITS) == h &&
1767	<	(ev = e.val) != null &&
1768	<	((ek = e.key) == k || k.equals(ek))) {
1769	<	e.val = v;
1770	<	break;
1771	<	}
1772	<	Node last = e;
1773	<	if ((e = e.next) == null) {
1774	<	++delta;
1775	<	last.next = new Node(h, k, v, null);
1776	<	if (count >= TREE_THRESHOLD)
1777	<	replaceWithTreeBin(tab, i, k);
1778	<	break;
1779	<	}
1780	<	}
1781	<	}
1782	<	} finally {
1783	<	if (!f.casHash(fh | LOCKED, fh)) {
1784	<	f.hash = fh;
1785	<	synchronized (f) { f.notifyAll(); };
1786	<	}
1787	<	}
1788	<	if (count != 0) {
1789	<	if (count > 1) {
1790	<	counter.add(delta);
1791	<	delta = 0L;
1792	<	checkForResize();
1793	<	}
1794	<	break;
1795	<	}
1796	<	}
1797	<	}
1798	<	}
1799	<	} finally {
1800	<	if (delta != 0)
1801	<	counter.add(delta);
1802	<	}
1803	<	if (npe)
1804	<	throw new NullPointerException();
692	>	static final int spread(int h) {
693	>	return (h ^ (h >>> 16)) & HASH_BITS;
694		}
695
1807	–	/* ---------------- Table Initialization and Resizing -------------- */
1808	–
696		/**
697		* Returns a power of two table size for the given desired capacity.
698		* See Hackers Delight, sec 3.2
#	Line 1821 | Line 708 | public class ConcurrentHashMapV8<K, V>
708		}
709
710		/**
711	<	* Initializes table, using the size recorded in sizeCtl.
711	>	* Returns x's Class if it is of the form "class C implements
712	>	* Comparable<C>", else null.
713		*/
714	<	private final Node[] initTable() {
715	<	Node[] tab; int sc;
716	<	while ((tab = table) == null) {
717	<	if ((sc = sizeCtl) < 0)
718	<	Thread.yield(); // lost initialization race; just spin
719	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
720	<	try {
721	<	if ((tab = table) == null) {
722	<	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
723	<	tab = table = new Node[n];
724	<	sc = n - (n >>> 2);
725	<	}
726	<	} finally {
1839	<	sizeCtl = sc;
714	>	static Class<?> comparableClassFor(Object x) {
715	>	if (x instanceof Comparable) {
716	>	Class<?> c; Type[] ts, as; Type t; ParameterizedType p;
717	>	if ((c = x.getClass()) == String.class) // bypass checks
718	>	return c;
719	>	if ((ts = c.getGenericInterfaces()) != null) {
720	>	for (int i = 0; i < ts.length; ++i) {
721	>	if (((t = ts[i]) instanceof ParameterizedType) &&
722	>	((p = (ParameterizedType)t).getRawType() ==
723	>	Comparable.class) &&
724	>	(as = p.getActualTypeArguments()) != null &&
725	>	as.length == 1 && as[0] == c) // type arg is c
726	>	return c;
727		}
1841	–	break;
1842	–	}
1843	–	}
1844	–	return tab;
1845	–	}
1846	–
1847	–	/**
1848	–	* If table is too small and not already resizing, creates next
1849	–	* table and transfers bins.  Rechecks occupancy after a transfer
1850	–	* to see if another resize is already needed because resizings
1851	–	* are lagging additions.
1852	–	*/
1853	–	private final void checkForResize() {
1854	–	Node[] tab; int n, sc;
1855	–	while ((tab = table) != null &&
1856	–	(n = tab.length) < MAXIMUM_CAPACITY &&
1857	–	(sc = sizeCtl) >= 0 && counter.sum() >= (long)sc &&
1858	–	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1859	–	try {
1860	–	if (tab == table) {
1861	–	table = rebuild(tab);
1862	–	sc = (n << 1) - (n >>> 1);
1863	–	}
1864	–	} finally {
1865	–	sizeCtl = sc;
728		}
729		}
730	+	return null;
731		}
732
733		/**
734	<	* Tries to presize table to accommodate the given number of elements.
735	<	*
1873	<	* @param size number of elements (doesn't need to be perfectly accurate)
734	>	* Returns k.compareTo(x) if x matches kc (k's screened comparable
735	>	* class), else 0.
736		*/
737	<	private final void tryPresize(int size) {
738	<	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
739	<	tableSizeFor(size + (size >>> 1) + 1);
740	<	int sc;
1879	<	while ((sc = sizeCtl) >= 0) {
1880	<	Node[] tab = table; int n;
1881	<	if (tab == null || (n = tab.length) == 0) {
1882	<	n = (sc > c) ? sc : c;
1883	<	if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1884	<	try {
1885	<	if (table == tab) {
1886	<	table = new Node[n];
1887	<	sc = n - (n >>> 2);
1888	<	}
1889	<	} finally {
1890	<	sizeCtl = sc;
1891	<	}
1892	<	}
1893	<	}
1894	<	else if (c <= sc || n >= MAXIMUM_CAPACITY)
1895	<	break;
1896	<	else if (UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
1897	<	try {
1898	<	if (table == tab) {
1899	<	table = rebuild(tab);
1900	<	sc = (n << 1) - (n >>> 1);
1901	<	}
1902	<	} finally {
1903	<	sizeCtl = sc;
1904	<	}
1905	<	}
1906	<	}
737	>	@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable
738	>	static int compareComparables(Class<?> kc, Object k, Object x) {
739	>	return (x == null || x.getClass() != kc ? 0 :
740	>	((Comparable)k).compareTo(x));
741		}
742
743	+	/* ---------------- Table element access -------------- */
744	+
745		/*
746	<	* Moves and/or copies the nodes in each bin to new table. See
747	<	* above for explanation.
748	<	*
749	<	* @return the new table
746	>	* Volatile access methods are used for table elements as well as
747	>	* elements of in-progress next table while resizing.  All uses of
748	>	* the tab arguments must be null checked by callers.  All callers
749	>	* also paranoically precheck that tab's length is not zero (or an
750	>	* equivalent check), thus ensuring that any index argument taking
751	>	* the form of a hash value anded with (length - 1) is a valid
752	>	* index.  Note that, to be correct wrt arbitrary concurrency
753	>	* errors by users, these checks must operate on local variables,
754	>	* which accounts for some odd-looking inline assignments below.
755	>	* Note that calls to setTabAt always occur within locked regions,
756	>	* and so in principle require only release ordering, not
757	>	* full volatile semantics, but are currently coded as volatile
758	>	* writes to be conservative.
759		*/
760	<	private static final Node[] rebuild(Node[] tab) {
761	<	int n = tab.length;
762	<	Node[] nextTab = new Node[n << 1];
763	<	Node fwd = new Node(MOVED, nextTab, null, null);
764	<	int[] buffer = null;       // holds bins to revisit; null until needed
765	<	Node rev = null;           // reverse forwarder; null until needed
766	<	int nbuffered = 0;         // the number of bins in buffer list
767	<	int bufferIndex = 0;       // buffer index of current buffered bin
768	<	int bin = n - 1;           // current non-buffered bin or -1 if none
1924	<
1925	<	for (int i = bin;;) {      // start upwards sweep
1926	<	int fh; Node f;
1927	<	if ((f = tabAt(tab, i)) == null) {
1928	<	if (bin >= 0) {    // no lock needed (or available)
1929	<	if (!casTabAt(tab, i, f, fwd))
1930	<	continue;
1931	<	}
1932	<	else {             // transiently use a locked forwarding node
1933	<	Node g = new Node(MOVED|LOCKED, nextTab, null, null);
1934	<	if (!casTabAt(tab, i, f, g))
1935	<	continue;
1936	<	setTabAt(nextTab, i, null);
1937	<	setTabAt(nextTab, i + n, null);
1938	<	setTabAt(tab, i, fwd);
1939	<	if (!g.casHash(MOVED|LOCKED, MOVED)) {
1940	<	g.hash = MOVED;
1941	<	synchronized (g) { g.notifyAll(); }
1942	<	}
1943	<	}
1944	<	}
1945	<	else if ((fh = f.hash) == MOVED) {
1946	<	Object fk = f.key;
1947	<	if (fk instanceof TreeBin) {
1948	<	TreeBin t = (TreeBin)fk;
1949	<	boolean validated = false;
1950	<	t.acquire(0);
1951	<	try {
1952	<	if (tabAt(tab, i) == f) {
1953	<	validated = true;
1954	<	splitTreeBin(nextTab, i, t);
1955	<	setTabAt(tab, i, fwd);
1956	<	}
1957	<	} finally {
1958	<	t.release(0);
1959	<	}
1960	<	if (!validated)
1961	<	continue;
1962	<	}
1963	<	}
1964	<	else if ((fh & LOCKED) == 0 && f.casHash(fh, fh|LOCKED)) {
1965	<	boolean validated = false;
1966	<	try {              // split to lo and hi lists; copying as needed
1967	<	if (tabAt(tab, i) == f) {
1968	<	validated = true;
1969	<	splitBin(nextTab, i, f);
1970	<	setTabAt(tab, i, fwd);
1971	<	}
1972	<	} finally {
1973	<	if (!f.casHash(fh | LOCKED, fh)) {
1974	<	f.hash = fh;
1975	<	synchronized (f) { f.notifyAll(); };
1976	<	}
1977	<	}
1978	<	if (!validated)
1979	<	continue;
1980	<	}
1981	<	else {
1982	<	if (buffer == null) // initialize buffer for revisits
1983	<	buffer = new int[TRANSFER_BUFFER_SIZE];
1984	<	if (bin < 0 && bufferIndex > 0) {
1985	<	int j = buffer[--bufferIndex];
1986	<	buffer[bufferIndex] = i;
1987	<	i = j;         // swap with another bin
1988	<	continue;
1989	<	}
1990	<	if (bin < 0 || nbuffered >= TRANSFER_BUFFER_SIZE) {
1991	<	f.tryAwaitLock(tab, i);
1992	<	continue;      // no other options -- block
1993	<	}
1994	<	if (rev == null)   // initialize reverse-forwarder
1995	<	rev = new Node(MOVED, tab, null, null);
1996	<	if (tabAt(tab, i) != f || (f.hash & LOCKED) == 0)
1997	<	continue;      // recheck before adding to list
1998	<	buffer[nbuffered++] = i;
1999	<	setTabAt(nextTab, i, rev);     // install place-holders
2000	<	setTabAt(nextTab, i + n, rev);
2001	<	}
2002	<
2003	<	if (bin > 0)
2004	<	i = --bin;
2005	<	else if (buffer != null && nbuffered > 0) {
2006	<	bin = -1;
2007	<	i = buffer[bufferIndex = --nbuffered];
2008	<	}
2009	<	else
2010	<	return nextTab;
2011	<	}
760	>
761	>	@SuppressWarnings("unchecked")
762	>	static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) {
763	>	return (Node<K,V>)U.getObjectVolatile(tab, ((long)i << ASHIFT) + ABASE);
764	>	}
765	>
766	>	static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i,
767	>	Node<K,V> c, Node<K,V> v) {
768	>	return U.compareAndSwapObject(tab, ((long)i << ASHIFT) + ABASE, c, v);
769		}
770
771	+	static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) {
772	+	U.putObjectVolatile(tab, ((long)i << ASHIFT) + ABASE, v);
773	+	}
774	+
775	+	/* ---------------- Fields -------------- */
776	+
777		/**
778	<	* Split a normal bin with list headed by e into lo and hi parts;
779	<	* install in given table
778	>	* The array of bins. Lazily initialized upon first insertion.
779	>	* Size is always a power of two. Accessed directly by iterators.
780		*/
781	<	private static void splitBin(Node[] nextTab, int i, Node e) {
2019	<	int bit = nextTab.length >>> 1; // bit to split on
2020	<	int runBit = e.hash & bit;
2021	<	Node lastRun = e, lo = null, hi = null;
2022	<	for (Node p = e.next; p != null; p = p.next) {
2023	<	int b = p.hash & bit;
2024	<	if (b != runBit) {
2025	<	runBit = b;
2026	<	lastRun = p;
2027	<	}
2028	<	}
2029	<	if (runBit == 0)
2030	<	lo = lastRun;
2031	<	else
2032	<	hi = lastRun;
2033	<	for (Node p = e; p != lastRun; p = p.next) {
2034	<	int ph = p.hash & HASH_BITS;
2035	<	Object pk = p.key, pv = p.val;
2036	<	if ((ph & bit) == 0)
2037	<	lo = new Node(ph, pk, pv, lo);
2038	<	else
2039	<	hi = new Node(ph, pk, pv, hi);
2040	<	}
2041	<	setTabAt(nextTab, i, lo);
2042	<	setTabAt(nextTab, i + bit, hi);
2043	<	}
781	>	transient volatile Node<K,V>[] table;
782
783		/**
784	<	* Split a tree bin into lo and hi parts; install in given table
784	>	* The next table to use; non-null only while resizing.
785		*/
786	<	private static void splitTreeBin(Node[] nextTab, int i, TreeBin t) {
2049	<	int bit = nextTab.length >>> 1;
2050	<	TreeBin lt = new TreeBin();
2051	<	TreeBin ht = new TreeBin();
2052	<	int lc = 0, hc = 0;
2053	<	for (Node e = t.first; e != null; e = e.next) {
2054	<	int h = e.hash & HASH_BITS;
2055	<	Object k = e.key, v = e.val;
2056	<	if ((h & bit) == 0) {
2057	<	++lc;
2058	<	lt.putTreeNode(h, k, v);
2059	<	}
2060	<	else {
2061	<	++hc;
2062	<	ht.putTreeNode(h, k, v);
2063	<	}
2064	<	}
2065	<	Node ln, hn; // throw away trees if too small
2066	<	if (lc <= (TREE_THRESHOLD >>> 1)) {
2067	<	ln = null;
2068	<	for (Node p = lt.first; p != null; p = p.next)
2069	<	ln = new Node(p.hash, p.key, p.val, ln);
2070	<	}
2071	<	else
2072	<	ln = new Node(MOVED, lt, null, null);
2073	<	setTabAt(nextTab, i, ln);
2074	<	if (hc <= (TREE_THRESHOLD >>> 1)) {
2075	<	hn = null;
2076	<	for (Node p = ht.first; p != null; p = p.next)
2077	<	hn = new Node(p.hash, p.key, p.val, hn);
2078	<	}
2079	<	else
2080	<	hn = new Node(MOVED, ht, null, null);
2081	<	setTabAt(nextTab, i + bit, hn);
2082	<	}
786	>	private transient volatile Node<K,V>[] nextTable;
787
788		/**
789	<	* Implementation for clear. Steps through each bin, removing all
790	<	* nodes.
789	>	* Base counter value, used mainly when there is no contention,
790	>	* but also as a fallback during table initialization
791	>	* races. Updated via CAS.
792		*/
793	<	private final void internalClear() {
2089	<	long delta = 0L; // negative number of deletions
2090	<	int i = 0;
2091	<	Node[] tab = table;
2092	<	while (tab != null && i < tab.length) {
2093	<	int fh; Object fk;
2094	<	Node f = tabAt(tab, i);
2095	<	if (f == null)
2096	<	++i;
2097	<	else if ((fh = f.hash) == MOVED) {
2098	<	if ((fk = f.key) instanceof TreeBin) {
2099	<	TreeBin t = (TreeBin)fk;
2100	<	t.acquire(0);
2101	<	try {
2102	<	if (tabAt(tab, i) == f) {
2103	<	for (Node p = t.first; p != null; p = p.next) {
2104	<	p.val = null;
2105	<	--delta;
2106	<	}
2107	<	t.first = null;
2108	<	t.root = null;
2109	<	++i;
2110	<	}
2111	<	} finally {
2112	<	t.release(0);
2113	<	}
2114	<	}
2115	<	else
2116	<	tab = (Node[])fk;
2117	<	}
2118	<	else if ((fh & LOCKED) != 0) {
2119	<	counter.add(delta); // opportunistically update count
2120	<	delta = 0L;
2121	<	f.tryAwaitLock(tab, i);
2122	<	}
2123	<	else if (f.casHash(fh, fh | LOCKED)) {
2124	<	try {
2125	<	if (tabAt(tab, i) == f) {
2126	<	for (Node e = f; e != null; e = e.next) {
2127	<	e.val = null;
2128	<	--delta;
2129	<	}
2130	<	setTabAt(tab, i, null);
2131	<	++i;
2132	<	}
2133	<	} finally {
2134	<	if (!f.casHash(fh | LOCKED, fh)) {
2135	<	f.hash = fh;
2136	<	synchronized (f) { f.notifyAll(); };
2137	<	}
2138	<	}
2139	<	}
2140	<	}
2141	<	if (delta != 0)
2142	<	counter.add(delta);
2143	<	}
793	>	private transient volatile long baseCount;
794
795	<	/* ----------------Table Traversal -------------- */
795	>	/**
796	>	* Table initialization and resizing control.  When negative, the
797	>	* table is being initialized or resized: -1 for initialization,
798	>	* else -(1 + the number of active resizing threads).  Otherwise,
799	>	* when table is null, holds the initial table size to use upon
800	>	* creation, or 0 for default. After initialization, holds the
801	>	* next element count value upon which to resize the table.
802	>	*/
803	>	private transient volatile int sizeCtl;
804
805		/**
806	<	* Encapsulates traversal for methods such as containsValue; also
2149	<	* serves as a base class for other iterators.
2150	<	*
2151	<	* At each step, the iterator snapshots the key ("nextKey") and
2152	<	* value ("nextVal") of a valid node (i.e., one that, at point of
2153	<	* snapshot, has a non-null user value). Because val fields can
2154	<	* change (including to null, indicating deletion), field nextVal
2155	<	* might not be accurate at point of use, but still maintains the
2156	<	* weak consistency property of holding a value that was once
2157	<	* valid.
2158	<	*
2159	<	* Internal traversals directly access these fields, as in:
2160	<	* {@code while (it.advance() != null) { process(it.nextKey); }}
2161	<	*
2162	<	* Exported iterators must track whether the iterator has advanced
2163	<	* (in hasNext vs next) (by setting/checking/nulling field
2164	<	* nextVal), and then extract key, value, or key-value pairs as
2165	<	* return values of next().
2166	<	*
2167	<	* The iterator visits once each still-valid node that was
2168	<	* reachable upon iterator construction. It might miss some that
2169	<	* were added to a bin after the bin was visited, which is OK wrt
2170	<	* consistency guarantees. Maintaining this property in the face
2171	<	* of possible ongoing resizes requires a fair amount of
2172	<	* bookkeeping state that is difficult to optimize away amidst
2173	<	* volatile accesses.  Even so, traversal maintains reasonable
2174	<	* throughput.
2175	<	*
2176	<	* Normally, iteration proceeds bin-by-bin traversing lists.
2177	<	* However, if the table has been resized, then all future steps
2178	<	* must traverse both the bin at the current index as well as at
2179	<	* (index + baseSize); and so on for further resizings. To
2180	<	* paranoically cope with potential sharing by users of iterators
2181	<	* across threads, iteration terminates if a bounds checks fails
2182	<	* for a table read.
806	>	* The next table index (plus one) to split while resizing.
807		*/
808	<	static class InternalIterator<K,V> {
2185	<	final ConcurrentHashMapV8<K, V> map;
2186	<	Node next;           // the next entry to use
2187	<	Node last;           // the last entry used
2188	<	Object nextKey;      // cached key field of next
2189	<	Object nextVal;      // cached val field of next
2190	<	Node[] tab;          // current table; updated if resized
2191	<	int index;           // index of bin to use next
2192	<	int baseIndex;       // current index of initial table
2193	<	int baseLimit;       // index bound for initial table
2194	<	final int baseSize;  // initial table size
2195	<
2196	<	/** Creates iterator for all entries in the table. */
2197	<	InternalIterator(ConcurrentHashMapV8<K, V> map) {
2198	<	this.tab = (this.map = map).table;
2199	<	baseLimit = baseSize = (tab == null) ? 0 : tab.length;
2200	<	}
2201	<
2202	<	/** Creates iterator for clone() and split() methods */
2203	<	InternalIterator(InternalIterator<K,V> it, boolean split) {
2204	<	this.map = it.map;
2205	<	this.tab = it.tab;
2206	<	this.baseSize = it.baseSize;
2207	<	int lo = it.baseIndex;
2208	<	int hi = this.baseLimit = it.baseLimit;
2209	<	this.index = this.baseIndex =
2210	<	(split) ? (it.baseLimit = (lo + hi + 1) >>> 1) : lo;
2211	<	}
808	>	private transient volatile int transferIndex;
809
810	<	/**
811	<	* Advances next; returns nextVal or null if terminated
812	<	* See above for explanation.
813	<	*/
2217	<	final Object advance() {
2218	<	Node e = last = next;
2219	<	Object ev = null;
2220	<	outer: do {
2221	<	if (e != null)                  // advance past used/skipped node
2222	<	e = e.next;
2223	<	while (e == null) {             // get to next non-null bin
2224	<	Node[] t; int b, i, n; Object ek; // checks must use locals
2225	<	if ((b = baseIndex) >= baseLimit || (i = index) < 0 ||
2226	<	(t = tab) == null || i >= (n = t.length))
2227	<	break outer;
2228	<	else if ((e = tabAt(t, i)) != null && e.hash == MOVED) {
2229	<	if ((ek = e.key) instanceof TreeBin)
2230	<	e = ((TreeBin)ek).first;
2231	<	else {
2232	<	tab = (Node[])ek;
2233	<	continue;           // restarts due to null val
2234	<	}
2235	<	}                           // visit upper slots if present
2236	<	index = (i += baseSize) < n ? i : (baseIndex = b + 1);
2237	<	}
2238	<	nextKey = e.key;
2239	<	} while ((ev = e.val) == null);    // skip deleted or special nodes
2240	<	next = e;
2241	<	return nextVal = ev;
2242	<	}
810	>	/**
811	>	* Spinlock (locked via CAS) used when resizing and/or creating CounterCells.
812	>	*/
813	>	private transient volatile int cellsBusy;
814
815	<	public final void remove() {
816	<	if (nextVal == null)
817	<	advance();
818	<	Node e = last;
2248	<	if (e == null)
2249	<	throw new IllegalStateException();
2250	<	last = null;
2251	<	map.remove(e.key);
2252	<	}
815	>	/**
816	>	* Table of counter cells. When non-null, size is a power of 2.
817	>	*/
818	>	private transient volatile CounterCell[] counterCells;
819
820	<	public final boolean hasNext() {
821	<	return nextVal != null || advance() != null;
822	<	}
820	>	// views
821	>	private transient KeySetView<K,V> keySet;
822	>	private transient ValuesView<K,V> values;
823	>	private transient EntrySetView<K,V> entrySet;
824
2258	–	public final boolean hasMoreElements() { return hasNext(); }
2259	–	}
825
826		/* ---------------- Public operations -------------- */
827
828		/**
829	<	* Creates a new, empty map with the default initial table size (16),
829	>	* Creates a new, empty map with the default initial table size (16).
830		*/
831		public ConcurrentHashMapV8() {
2267	–	this.counter = new LongAdder();
832		}
833
834		/**
#	Line 2283 | Line 847 | public class ConcurrentHashMapV8<K, V>
847		int cap = ((initialCapacity >= (MAXIMUM_CAPACITY >>> 1)) ?
848		MAXIMUM_CAPACITY :
849		tableSizeFor(initialCapacity + (initialCapacity >>> 1) + 1));
2286	–	this.counter = new LongAdder();
850		this.sizeCtl = cap;
851		}
852
#	Line 2293 | Line 856 | public class ConcurrentHashMapV8<K, V>
856		* @param m the map
857		*/
858		public ConcurrentHashMapV8(Map<? extends K, ? extends V> m) {
2296	–	this.counter = new LongAdder();
859		this.sizeCtl = DEFAULT_CAPACITY;
860	<	internalPutAll(m);
860	>	putAll(m);
861		}
862
863		/**
#	Line 2336 | Line 898 | public class ConcurrentHashMapV8<K, V>
898		* nonpositive
899		*/
900		public ConcurrentHashMapV8(int initialCapacity,
901	<	float loadFactor, int concurrencyLevel) {
901	>	float loadFactor, int concurrencyLevel) {
902		if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
903		throw new IllegalArgumentException();
904		if (initialCapacity < concurrencyLevel)   // Use at least as many bins
905		initialCapacity = concurrencyLevel;   // as estimated threads
906		long size = (long)(1.0 + (long)initialCapacity / loadFactor);
907	<	int cap = ((size >= (long)MAXIMUM_CAPACITY) ?
908	<	MAXIMUM_CAPACITY: tableSizeFor((int)size));
2347	<	this.counter = new LongAdder();
907	>	int cap = (size >= (long)MAXIMUM_CAPACITY) ?
908	>	MAXIMUM_CAPACITY : tableSizeFor((int)size);
909		this.sizeCtl = cap;
910		}
911
912	<	/**
2352	<	* {@inheritDoc}
2353	<	*/
2354	<	public boolean isEmpty() {
2355	<	return counter.sum() <= 0L; // ignore transient negative values
2356	<	}
912	>	// Original (since JDK1.2) Map methods
913
914		/**
915		* {@inheritDoc}
916		*/
917		public int size() {
918	<	long n = counter.sum();
918	>	long n = sumCount();
919		return ((n < 0L) ? 0 :
920		(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE :
921		(int)n);
922		}
923
924	<	final long longSize() { // accurate version of size needed for views
925	<	long n = counter.sum();
926	<	return (n < 0L) ? 0L : n;
924	>	/**
925	>	* {@inheritDoc}
926	>	*/
927	>	public boolean isEmpty() {
928	>	return sumCount() <= 0L; // ignore transient negative values
929		}
930
931		/**
#	Line 2381 | Line 939 | public class ConcurrentHashMapV8<K, V>
939		*
940		* @throws NullPointerException if the specified key is null
941		*/
2384	–	@SuppressWarnings("unchecked")
942		public V get(Object key) {
943	<	if (key == null)
944	<	throw new NullPointerException();
945	<	return (V)internalGet(key);
943	>	Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek;
944	>	int h = spread(key.hashCode());
945	>	if ((tab = table) != null && (n = tab.length) > 0 &&
946	>	(e = tabAt(tab, (n - 1) & h)) != null) {
947	>	if ((eh = e.hash) == h) {
948	>	if ((ek = e.key) == key || (ek != null && key.equals(ek)))
949	>	return e.val;
950	>	}
951	>	else if (eh < 0)
952	>	return (p = e.find(h, key)) != null ? p.val : null;
953	>	while ((e = e.next) != null) {
954	>	if (e.hash == h &&
955	>	((ek = e.key) == key || (ek != null && key.equals(ek))))
956	>	return e.val;
957	>	}
958	>	}
959	>	return null;
960		}
961
962		/**
963		* Tests if the specified object is a key in this table.
964		*
965	<	* @param  key   possible key
965	>	* @param  key possible key
966		* @return {@code true} if and only if the specified object
967		*         is a key in this table, as determined by the
968		*         {@code equals} method; {@code false} otherwise
969		* @throws NullPointerException if the specified key is null
970		*/
971		public boolean containsKey(Object key) {
972	<	if (key == null)
2402	<	throw new NullPointerException();
2403	<	return internalGet(key) != null;
972	>	return get(key) != null;
973		}
974
975		/**
#	Line 2416 | Line 985 | public class ConcurrentHashMapV8<K, V>
985		public boolean containsValue(Object value) {
986		if (value == null)
987		throw new NullPointerException();
988	<	Object v;
989	<	InternalIterator<K,V> it = new InternalIterator<K,V>(this);
990	<	while ((v = it.advance()) != null) {
991	<	if (v == value || value.equals(v))
992	<	return true;
988	>	Node<K,V>[] t;
989	>	if ((t = table) != null) {
990	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
991	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
992	>	V v;
993	>	if ((v = p.val) == value || (v != null && value.equals(v)))
994	>	return true;
995	>	}
996		}
997		return false;
998		}
999
1000		/**
2429	–	* Legacy method testing if some key maps into the specified value
2430	–	* in this table.  This method is identical in functionality to
2431	–	* {@link #containsValue}, and exists solely to ensure
2432	–	* full compatibility with class {@link java.util.Hashtable},
2433	–	* which supported this method prior to introduction of the
2434	–	* Java Collections framework.
2435	–	*
2436	–	* @param  value a value to search for
2437	–	* @return {@code true} if and only if some key maps to the
2438	–	*         {@code value} argument in this table as
2439	–	*         determined by the {@code equals} method;
2440	–	*         {@code false} otherwise
2441	–	* @throws NullPointerException if the specified value is null
2442	–	*/
2443	–	public boolean contains(Object value) {
2444	–	return containsValue(value);
2445	–	}
2446	–
2447	–	/**
1001		* Maps the specified key to the specified value in this table.
1002		* Neither the key nor the value can be null.
1003		*
1004	<	* <p> The value can be retrieved by calling the {@code get} method
1004	>	* <p>The value can be retrieved by calling the {@code get} method
1005		* with a key that is equal to the original key.
1006		*
1007		* @param key key with which the specified value is to be associated
#	Line 2457 | Line 1010 | public class ConcurrentHashMapV8<K, V>
1010		*         {@code null} if there was no mapping for {@code key}
1011		* @throws NullPointerException if the specified key or value is null
1012		*/
2460	–	@SuppressWarnings("unchecked")
1013		public V put(K key, V value) {
1014	<	if (key == null || value == null)
2463	<	throw new NullPointerException();
2464	<	return (V)internalPut(key, value);
1014	>	return putVal(key, value, false);
1015		}
1016
1017	<	/**
1018	<	* {@inheritDoc}
1019	<	*
1020	<	* @return the previous value associated with the specified key,
1021	<	*         or {@code null} if there was no mapping for the key
1022	<	* @throws NullPointerException if the specified key or value is null
1023	<	*/
1024	<	@SuppressWarnings("unchecked")
1025	<	public V putIfAbsent(K key, V value) {
1026	<	if (key == null || value == null)
1027	<	throw new NullPointerException();
1028	<	return (V)internalPutIfAbsent(key, value);
1017	>	/** Implementation for put and putIfAbsent */
1018	>	final V putVal(K key, V value, boolean onlyIfAbsent) {
1019	>	if (key == null || value == null) throw new NullPointerException();
1020	>	int hash = spread(key.hashCode());
1021	>	int binCount = 0;
1022	>	for (Node<K,V>[] tab = table;;) {
1023	>	Node<K,V> f; int n, i, fh;
1024	>	if (tab == null || (n = tab.length) == 0)
1025	>	tab = initTable();
1026	>	else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) {
1027	>	if (casTabAt(tab, i, null,
1028	>	new Node<K,V>(hash, key, value, null)))
1029	>	break;                   // no lock when adding to empty bin
1030	>	}
1031	>	else if ((fh = f.hash) == MOVED)
1032	>	tab = helpTransfer(tab, f);
1033	>	else {
1034	>	V oldVal = null;
1035	>	synchronized (f) {
1036	>	if (tabAt(tab, i) == f) {
1037	>	if (fh >= 0) {
1038	>	binCount = 1;
1039	>	for (Node<K,V> e = f;; ++binCount) {
1040	>	K ek;
1041	>	if (e.hash == hash &&
1042	>	((ek = e.key) == key ||
1043	>	(ek != null && key.equals(ek)))) {
1044	>	oldVal = e.val;
1045	>	if (!onlyIfAbsent)
1046	>	e.val = value;
1047	>	break;
1048	>	}
1049	>	Node<K,V> pred = e;
1050	>	if ((e = e.next) == null) {
1051	>	pred.next = new Node<K,V>(hash, key,
1052	>	value, null);
1053	>	break;
1054	>	}
1055	>	}
1056	>	}
1057	>	else if (f instanceof TreeBin) {
1058	>	Node<K,V> p;
1059	>	binCount = 2;
1060	>	if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key,
1061	>	value)) != null) {
1062	>	oldVal = p.val;
1063	>	if (!onlyIfAbsent)
1064	>	p.val = value;
1065	>	}
1066	>	}
1067	>	}
1068	>	}
1069	>	if (binCount != 0) {
1070	>	if (binCount >= TREEIFY_THRESHOLD)
1071	>	treeifyBin(tab, i);
1072	>	if (oldVal != null)
1073	>	return oldVal;
1074	>	break;
1075	>	}
1076	>	}
1077	>	}
1078	>	addCount(1L, binCount);
1079	>	return null;
1080		}
1081
1082		/**
#	Line 2486 | Line 1087 | public class ConcurrentHashMapV8<K, V>
1087		* @param m mappings to be stored in this map
1088		*/
1089		public void putAll(Map<? extends K, ? extends V> m) {
1090	<	internalPutAll(m);
1091	<	}
1092	<
2492	<	/**
2493	<	* If the specified key is not already associated with a value,
2494	<	* computes its value using the given mappingFunction and enters
2495	<	* it into the map unless null.  This is equivalent to
2496	<	* <pre> {@code
2497	<	* if (map.containsKey(key))
2498	<	*   return map.get(key);
2499	<	* value = mappingFunction.map(key);
2500	<	* if (value != null)
2501	<	*   map.put(key, value);
2502	<	* return value;}</pre>
2503	<	*
2504	<	* except that the action is performed atomically.  If the
2505	<	* function returns {@code null} no mapping is recorded. If the
2506	<	* function itself throws an (unchecked) exception, the exception
2507	<	* is rethrown to its caller, and no mapping is recorded.  Some
2508	<	* attempted update operations on this map by other threads may be
2509	<	* blocked while computation is in progress, so the computation
2510	<	* should be short and simple, and must not attempt to update any
2511	<	* other mappings of this Map. The most appropriate usage is to
2512	<	* construct a new object serving as an initial mapped value, or
2513	<	* memoized result, as in:
2514	<	*
2515	<	*  <pre> {@code
2516	<	* map.computeIfAbsent(key, new MappingFunction<K, V>() {
2517	<	*   public V map(K k) { return new Value(f(k)); }});}</pre>
2518	<	*
2519	<	* @param key key with which the specified value is to be associated
2520	<	* @param mappingFunction the function to compute a value
2521	<	* @return the current (existing or computed) value associated with
2522	<	*         the specified key, or null if the computed value is null.
2523	<	* @throws NullPointerException if the specified key or mappingFunction
2524	<	*         is null
2525	<	* @throws IllegalStateException if the computation detectably
2526	<	*         attempts a recursive update to this map that would
2527	<	*         otherwise never complete
2528	<	* @throws RuntimeException or Error if the mappingFunction does so,
2529	<	*         in which case the mapping is left unestablished
2530	<	*/
2531	<	@SuppressWarnings("unchecked")
2532	<	public V computeIfAbsent(K key, MappingFunction<? super K, ? extends V> mappingFunction) {
2533	<	if (key == null || mappingFunction == null)
2534	<	throw new NullPointerException();
2535	<	return (V)internalComputeIfAbsent(key, mappingFunction);
2536	<	}
2537	<
2538	<	/**
2539	<	* Computes a new mapping value given a key and
2540	<	* its current mapped value (or {@code null} if there is no current
2541	<	* mapping). This is equivalent to
2542	<	*  <pre> {@code
2543	<	*   value = remappingFunction.remap(key, map.get(key));
2544	<	*   if (value != null)
2545	<	*     map.put(key, value);
2546	<	*   else
2547	<	*     map.remove(key);
2548	<	* }</pre>
2549	<	*
2550	<	* except that the action is performed atomically.  If the
2551	<	* function returns {@code null}, the mapping is removed.  If the
2552	<	* function itself throws an (unchecked) exception, the exception
2553	<	* is rethrown to its caller, and the current mapping is left
2554	<	* unchanged.  Some attempted update operations on this map by
2555	<	* other threads may be blocked while computation is in progress,
2556	<	* so the computation should be short and simple, and must not
2557	<	* attempt to update any other mappings of this Map. For example,
2558	<	* to either create or append new messages to a value mapping:
2559	<	*
2560	<	* <pre> {@code
2561	<	* Map<Key, String> map = ...;
2562	<	* final String msg = ...;
2563	<	* map.compute(key, new RemappingFunction<Key, String>() {
2564	<	*   public String remap(Key k, String v) {
2565	<	*    return (v == null) ? msg : v + msg;});}}</pre>
2566	<	*
2567	<	* @param key key with which the specified value is to be associated
2568	<	* @param remappingFunction the function to compute a value
2569	<	* @return the new value associated with
2570	<	*         the specified key, or null if none.
2571	<	* @throws NullPointerException if the specified key or remappingFunction
2572	<	*         is null
2573	<	* @throws IllegalStateException if the computation detectably
2574	<	*         attempts a recursive update to this map that would
2575	<	*         otherwise never complete
2576	<	* @throws RuntimeException or Error if the remappingFunction does so,
2577	<	*         in which case the mapping is unchanged
2578	<	*/
2579	<	@SuppressWarnings("unchecked")
2580	<	public V compute(K key, RemappingFunction<? super K, V> remappingFunction) {
2581	<	if (key == null || remappingFunction == null)
2582	<	throw new NullPointerException();
2583	<	return (V)internalCompute(key, remappingFunction);
1090	>	tryPresize(m.size());
1091	>	for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
1092	>	putVal(e.getKey(), e.getValue(), false);
1093		}
1094
1095		/**
#	Line 2592 | Line 1101 | public class ConcurrentHashMapV8<K, V>
1101		*         {@code null} if there was no mapping for {@code key}
1102		* @throws NullPointerException if the specified key is null
1103		*/
2595	–	@SuppressWarnings("unchecked")
1104		public V remove(Object key) {
1105	<	if (key == null)
2598	<	throw new NullPointerException();
2599	<	return (V)internalReplace(key, null, null);
1105	>	return replaceNode(key, null, null);
1106		}
1107
1108		/**
1109	<	* {@inheritDoc}
1110	<	*
1111	<	* @throws NullPointerException if the specified key is null
2606	<	*/
2607	<	public boolean remove(Object key, Object value) {
2608	<	if (key == null)
2609	<	throw new NullPointerException();
2610	<	if (value == null)
2611	<	return false;
2612	<	return internalReplace(key, null, value) != null;
2613	<	}
2614	<
2615	<	/**
2616	<	* {@inheritDoc}
2617	<	*
2618	<	* @throws NullPointerException if any of the arguments are null
2619	<	*/
2620	<	public boolean replace(K key, V oldValue, V newValue) {
2621	<	if (key == null || oldValue == null || newValue == null)
2622	<	throw new NullPointerException();
2623	<	return internalReplace(key, newValue, oldValue) != null;
2624	<	}
2625	<
2626	<	/**
2627	<	* {@inheritDoc}
2628	<	*
2629	<	* @return the previous value associated with the specified key,
2630	<	*         or {@code null} if there was no mapping for the key
2631	<	* @throws NullPointerException if the specified key or value is null
1109	>	* Implementation for the four public remove/replace methods:
1110	>	* Replaces node value with v, conditional upon match of cv if
1111	>	* non-null.  If resulting value is null, delete.
1112		*/
1113	<	@SuppressWarnings("unchecked")
1114	<	public V replace(K key, V value) {
1115	<	if (key == null || value == null)
1116	<	throw new NullPointerException();
1117	<	return (V)internalReplace(key, value, null);
1113	>	final V replaceNode(Object key, V value, Object cv) {
1114	>	int hash = spread(key.hashCode());
1115	>	for (Node<K,V>[] tab = table;;) {
1116	>	Node<K,V> f; int n, i, fh;
1117	>	if (tab == null || (n = tab.length) == 0 ||
1118	>	(f = tabAt(tab, i = (n - 1) & hash)) == null)
1119	>	break;
1120	>	else if ((fh = f.hash) == MOVED)
1121	>	tab = helpTransfer(tab, f);
1122	>	else {
1123	>	V oldVal = null;
1124	>	boolean validated = false;
1125	>	synchronized (f) {
1126	>	if (tabAt(tab, i) == f) {
1127	>	if (fh >= 0) {
1128	>	validated = true;
1129	>	for (Node<K,V> e = f, pred = null;;) {
1130	>	K ek;
1131	>	if (e.hash == hash &&
1132	>	((ek = e.key) == key ||
1133	>	(ek != null && key.equals(ek)))) {
1134	>	V ev = e.val;
1135	>	if (cv == null || cv == ev ||
1136	>	(ev != null && cv.equals(ev))) {
1137	>	oldVal = ev;
1138	>	if (value != null)
1139	>	e.val = value;
1140	>	else if (pred != null)
1141	>	pred.next = e.next;
1142	>	else
1143	>	setTabAt(tab, i, e.next);
1144	>	}
1145	>	break;
1146	>	}
1147	>	pred = e;
1148	>	if ((e = e.next) == null)
1149	>	break;
1150	>	}
1151	>	}
1152	>	else if (f instanceof TreeBin) {
1153	>	validated = true;
1154	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1155	>	TreeNode<K,V> r, p;
1156	>	if ((r = t.root) != null &&
1157	>	(p = r.findTreeNode(hash, key, null)) != null) {
1158	>	V pv = p.val;
1159	>	if (cv == null || cv == pv ||
1160	>	(pv != null && cv.equals(pv))) {
1161	>	oldVal = pv;
1162	>	if (value != null)
1163	>	p.val = value;
1164	>	else if (t.removeTreeNode(p))
1165	>	setTabAt(tab, i, untreeify(t.first));
1166	>	}
1167	>	}
1168	>	}
1169	>	}
1170	>	}
1171	>	if (validated) {
1172	>	if (oldVal != null) {
1173	>	if (value == null)
1174	>	addCount(-1L, -1);
1175	>	return oldVal;
1176	>	}
1177	>	break;
1178	>	}
1179	>	}
1180	>	}
1181	>	return null;
1182		}
1183
1184		/**
1185		* Removes all of the mappings from this map.
1186		*/
1187		public void clear() {
1188	<	internalClear();
1188	>	long delta = 0L; // negative number of deletions
1189	>	int i = 0;
1190	>	Node<K,V>[] tab = table;
1191	>	while (tab != null && i < tab.length) {
1192	>	int fh;
1193	>	Node<K,V> f = tabAt(tab, i);
1194	>	if (f == null)
1195	>	++i;
1196	>	else if ((fh = f.hash) == MOVED) {
1197	>	tab = helpTransfer(tab, f);
1198	>	i = 0; // restart
1199	>	}
1200	>	else {
1201	>	synchronized (f) {
1202	>	if (tabAt(tab, i) == f) {
1203	>	Node<K,V> p = (fh >= 0 ? f :
1204	>	(f instanceof TreeBin) ?
1205	>	((TreeBin<K,V>)f).first : null);
1206	>	while (p != null) {
1207	>	--delta;
1208	>	p = p.next;
1209	>	}
1210	>	setTabAt(tab, i++, null);
1211	>	}
1212	>	}
1213	>	}
1214	>	}
1215	>	if (delta != 0L)
1216	>	addCount(delta, -1);
1217		}
1218
1219		/**
1220		* Returns a {@link Set} view of the keys contained in this map.
1221		* The set is backed by the map, so changes to the map are
1222	<	* reflected in the set, and vice-versa.  The set supports element
1222	>	* reflected in the set, and vice-versa. The set supports element
1223		* removal, which removes the corresponding mapping from this map,
1224		* via the {@code Iterator.remove}, {@code Set.remove},
1225		* {@code removeAll}, {@code retainAll}, and {@code clear}
#	Line 2659 | Line 1231 | public class ConcurrentHashMapV8<K, V>
1231		* and guarantees to traverse elements as they existed upon
1232		* construction of the iterator, and may (but is not guaranteed to)
1233		* reflect any modifications subsequent to construction.
1234	+	*
1235	+	* @return the set view
1236		*/
1237	<	public Set<K> keySet() {
1238	<	KeySet<K,V> ks = keySet;
1239	<	return (ks != null) ? ks : (keySet = new KeySet<K,V>(this));
1237	>	public KeySetView<K,V> keySet() {
1238	>	KeySetView<K,V> ks;
1239	>	return (ks = keySet) != null ? ks : (keySet = new KeySetView<K,V>(this, null));
1240		}
1241
1242		/**
#	Line 2680 | Line 1254 | public class ConcurrentHashMapV8<K, V>
1254		* and guarantees to traverse elements as they existed upon
1255		* construction of the iterator, and may (but is not guaranteed to)
1256		* reflect any modifications subsequent to construction.
1257	+	*
1258	+	* @return the collection view
1259		*/
1260		public Collection<V> values() {
1261	<	Values<K,V> vs = values;
1262	<	return (vs != null) ? vs : (values = new Values<K,V>(this));
1261	>	ValuesView<K,V> vs;
1262	>	return (vs = values) != null ? vs : (values = new ValuesView<K,V>(this));
1263		}
1264
1265		/**
#	Line 2693 | Line 1269 | public class ConcurrentHashMapV8<K, V>
1269		* removal, which removes the corresponding mapping from the map,
1270		* via the {@code Iterator.remove}, {@code Set.remove},
1271		* {@code removeAll}, {@code retainAll}, and {@code clear}
1272	<	* operations.  It does not support the {@code add} or
2697	<	* {@code addAll} operations.
1272	>	* operations.
1273		*
1274		* <p>The view's {@code iterator} is a "weakly consistent" iterator
1275		* that will never throw {@link ConcurrentModificationException},
1276		* and guarantees to traverse elements as they existed upon
1277		* construction of the iterator, and may (but is not guaranteed to)
1278		* reflect any modifications subsequent to construction.
2704	–	*/
2705	–	public Set<Map.Entry<K,V>> entrySet() {
2706	–	EntrySet<K,V> es = entrySet;
2707	–	return (es != null) ? es : (entrySet = new EntrySet<K,V>(this));
2708	–	}
2709	–
2710	–	/**
2711	–	* Returns an enumeration of the keys in this table.
1279		*
1280	<	* @return an enumeration of the keys in this table
2714	<	* @see #keySet()
1280	>	* @return the set view
1281		*/
1282	<	public Enumeration<K> keys() {
1283	<	return new KeyIterator<K,V>(this);
1284	<	}
2719	<
2720	<	/**
2721	<	* Returns an enumeration of the values in this table.
2722	<	*
2723	<	* @return an enumeration of the values in this table
2724	<	* @see #values()
2725	<	*/
2726	<	public Enumeration<V> elements() {
2727	<	return new ValueIterator<K,V>(this);
2728	<	}
2729	<
2730	<	/**
2731	<	* Returns a partionable iterator of the keys in this map.
2732	<	*
2733	<	* @return a partionable iterator of the keys in this map
2734	<	*/
2735	<	public Spliterator<K> keySpliterator() {
2736	<	return new KeyIterator<K,V>(this);
2737	<	}
2738	<
2739	<	/**
2740	<	* Returns a partionable iterator of the values in this map.
2741	<	*
2742	<	* @return a partionable iterator of the values in this map
2743	<	*/
2744	<	public Spliterator<V> valueSpliterator() {
2745	<	return new ValueIterator<K,V>(this);
2746	<	}
2747	<
2748	<	/**
2749	<	* Returns a partionable iterator of the entries in this map.
2750	<	*
2751	<	* @return a partionable iterator of the entries in this map
2752	<	*/
2753	<	public Spliterator<Map.Entry<K,V>> entrySpliterator() {
2754	<	return new EntryIterator<K,V>(this);
1282	>	public Set<Map.Entry<K,V>> entrySet() {
1283	>	EntrySetView<K,V> es;
1284	>	return (es = entrySet) != null ? es : (entrySet = new EntrySetView<K,V>(this));
1285		}
1286
1287		/**
#	Line 2763 | Line 1293 | public class ConcurrentHashMapV8<K, V>
1293		*/
1294		public int hashCode() {
1295		int h = 0;
1296	<	InternalIterator<K,V> it = new InternalIterator<K,V>(this);
1297	<	Object v;
1298	<	while ((v = it.advance()) != null) {
1299	<	h += it.nextKey.hashCode() ^ v.hashCode();
1296	>	Node<K,V>[] t;
1297	>	if ((t = table) != null) {
1298	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1299	>	for (Node<K,V> p; (p = it.advance()) != null; )
1300	>	h += p.key.hashCode() ^ p.val.hashCode();
1301		}
1302		return h;
1303		}
#	Line 2783 | Line 1314 | public class ConcurrentHashMapV8<K, V>
1314		* @return a string representation of this map
1315		*/
1316		public String toString() {
1317	<	InternalIterator<K,V> it = new InternalIterator<K,V>(this);
1317	>	Node<K,V>[] t;
1318	>	int f = (t = table) == null ? 0 : t.length;
1319	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1320		StringBuilder sb = new StringBuilder();
1321		sb.append('{');
1322	<	Object v;
1323	<	if ((v = it.advance()) != null) {
1322	>	Node<K,V> p;
1323	>	if ((p = it.advance()) != null) {
1324		for (;;) {
1325	<	Object k = it.nextKey;
1325	>	K k = p.key;
1326	>	V v = p.val;
1327		sb.append(k == this ? "(this Map)" : k);
1328		sb.append('=');
1329		sb.append(v == this ? "(this Map)" : v);
1330	<	if ((v = it.advance()) == null)
1330	>	if ((p = it.advance()) == null)
1331		break;
1332		sb.append(',').append(' ');
1333		}
#	Line 2816 | Line 1350 | public class ConcurrentHashMapV8<K, V>
1350		if (!(o instanceof Map))
1351		return false;
1352		Map<?,?> m = (Map<?,?>) o;
1353	<	InternalIterator<K,V> it = new InternalIterator<K,V>(this);
1354	<	Object val;
1355	<	while ((val = it.advance()) != null) {
1356	<	Object v = m.get(it.nextKey);
1353	>	Node<K,V>[] t;
1354	>	int f = (t = table) == null ? 0 : t.length;
1355	>	Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f);
1356	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1357	>	V val = p.val;
1358	>	Object v = m.get(p.key);
1359		if (v == null || (v != val && !v.equals(val)))
1360		return false;
1361		}
#	Line 2827 | Line 1363 | public class ConcurrentHashMapV8<K, V>
1363		Object mk, mv, v;
1364		if ((mk = e.getKey()) == null ||
1365		(mv = e.getValue()) == null ||
1366	<	(v = internalGet(mk)) == null ||
1366	>	(v = get(mk)) == null ||
1367		(mv != v && !mv.equals(v)))
1368		return false;
1369		}
#	Line 2835 | Line 1371 | public class ConcurrentHashMapV8<K, V>
1371		return true;
1372		}
1373
1374	<	/* ----------------Iterators -------------- */
1374	>	/**
1375	>	* Stripped-down version of helper class used in previous version,
1376	>	* declared for the sake of serialization compatibility
1377	>	*/
1378	>	static class Segment<K,V> extends ReentrantLock implements Serializable {
1379	>	private static final long serialVersionUID = 2249069246763182397L;
1380	>	final float loadFactor;
1381	>	Segment(float lf) { this.loadFactor = lf; }
1382	>	}
1383
1384	<	static final class KeyIterator<K,V> extends InternalIterator<K,V>
1385	<	implements Spliterator<K>, Enumeration<K> {
1386	<	KeyIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
1387	<	KeyIterator(InternalIterator<K,V> it, boolean split) {
1388	<	super(it, split);
1384	>	/**
1385	>	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
1386	>	* stream (i.e., serializes it).
1387	>	* @param s the stream
1388	>	* @throws java.io.IOException if an I/O error occurs
1389	>	* @serialData
1390	>	* the key (Object) and value (Object)
1391	>	* for each key-value mapping, followed by a null pair.
1392	>	* The key-value mappings are emitted in no particular order.
1393	>	*/
1394	>	private void writeObject(java.io.ObjectOutputStream s)
1395	>	throws java.io.IOException {
1396	>	// For serialization compatibility
1397	>	// Emulate segment calculation from previous version of this class
1398	>	int sshift = 0;
1399	>	int ssize = 1;
1400	>	while (ssize < DEFAULT_CONCURRENCY_LEVEL) {
1401	>	++sshift;
1402	>	ssize <<= 1;
1403	>	}
1404	>	int segmentShift = 32 - sshift;
1405	>	int segmentMask = ssize - 1;
1406	>	@SuppressWarnings("unchecked") Segment<K,V>[] segments = (Segment<K,V>[])
1407	>	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
1408	>	for (int i = 0; i < segments.length; ++i)
1409	>	segments[i] = new Segment<K,V>(LOAD_FACTOR);
1410	>	s.putFields().put("segments", segments);
1411	>	s.putFields().put("segmentShift", segmentShift);
1412	>	s.putFields().put("segmentMask", segmentMask);
1413	>	s.writeFields();
1414	>
1415	>	Node<K,V>[] t;
1416	>	if ((t = table) != null) {
1417	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1418	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1419	>	s.writeObject(p.key);
1420	>	s.writeObject(p.val);
1421	>	}
1422		}
1423	<	public KeyIterator<K,V> split() {
1424	<	if (last != null || (next != null && nextVal == null))
1425	<	throw new IllegalStateException();
1426	<	return new KeyIterator<K,V>(this, true);
1423	>	s.writeObject(null);
1424	>	s.writeObject(null);
1425	>	segments = null; // throw away
1426	>	}
1427	>
1428	>	/**
1429	>	* Reconstitutes the instance from a stream (that is, deserializes it).
1430	>	* @param s the stream
1431	>	* @throws ClassNotFoundException if the class of a serialized object
1432	>	*         could not be found
1433	>	* @throws java.io.IOException if an I/O error occurs
1434	>	*/
1435	>	private void readObject(java.io.ObjectInputStream s)
1436	>	throws java.io.IOException, ClassNotFoundException {
1437	>	/*
1438	>	* To improve performance in typical cases, we create nodes
1439	>	* while reading, then place in table once size is known.
1440	>	* However, we must also validate uniqueness and deal with
1441	>	* overpopulated bins while doing so, which requires
1442	>	* specialized versions of putVal mechanics.
1443	>	*/
1444	>	sizeCtl = -1; // force exclusion for table construction
1445	>	s.defaultReadObject();
1446	>	long size = 0L;
1447	>	Node<K,V> p = null;
1448	>	for (;;) {
1449	>	@SuppressWarnings("unchecked") K k = (K) s.readObject();
1450	>	@SuppressWarnings("unchecked") V v = (V) s.readObject();
1451	>	if (k != null && v != null) {
1452	>	p = new Node<K,V>(spread(k.hashCode()), k, v, p);
1453	>	++size;
1454	>	}
1455	>	else
1456	>	break;
1457		}
1458	<	public KeyIterator<K,V> clone() {
1459	<	if (last != null || (next != null && nextVal == null))
1460	<	throw new IllegalStateException();
1461	<	return new KeyIterator<K,V>(this, false);
1458	>	if (size == 0L)
1459	>	sizeCtl = 0;
1460	>	else {
1461	>	int n;
1462	>	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
1463	>	n = MAXIMUM_CAPACITY;
1464	>	else {
1465	>	int sz = (int)size;
1466	>	n = tableSizeFor(sz + (sz >>> 1) + 1);
1467	>	}
1468	>	@SuppressWarnings("unchecked")
1469	>	Node<K,V>[] tab = (Node<K,V>[])new Node<?,?>[n];
1470	>	int mask = n - 1;
1471	>	long added = 0L;
1472	>	while (p != null) {
1473	>	boolean insertAtFront;
1474	>	Node<K,V> next = p.next, first;
1475	>	int h = p.hash, j = h & mask;
1476	>	if ((first = tabAt(tab, j)) == null)
1477	>	insertAtFront = true;
1478	>	else {
1479	>	K k = p.key;
1480	>	if (first.hash < 0) {
1481	>	TreeBin<K,V> t = (TreeBin<K,V>)first;
1482	>	if (t.putTreeVal(h, k, p.val) == null)
1483	>	++added;
1484	>	insertAtFront = false;
1485	>	}
1486	>	else {
1487	>	int binCount = 0;
1488	>	insertAtFront = true;
1489	>	Node<K,V> q; K qk;
1490	>	for (q = first; q != null; q = q.next) {
1491	>	if (q.hash == h &&
1492	>	((qk = q.key) == k ||
1493	>	(qk != null && k.equals(qk)))) {
1494	>	insertAtFront = false;
1495	>	break;
1496	>	}
1497	>	++binCount;
1498	>	}
1499	>	if (insertAtFront && binCount >= TREEIFY_THRESHOLD) {
1500	>	insertAtFront = false;
1501	>	++added;
1502	>	p.next = first;
1503	>	TreeNode<K,V> hd = null, tl = null;
1504	>	for (q = p; q != null; q = q.next) {
1505	>	TreeNode<K,V> t = new TreeNode<K,V>
1506	>	(q.hash, q.key, q.val, null, null);
1507	>	if ((t.prev = tl) == null)
1508	>	hd = t;
1509	>	else
1510	>	tl.next = t;
1511	>	tl = t;
1512	>	}
1513	>	setTabAt(tab, j, new TreeBin<K,V>(hd));
1514	>	}
1515	>	}
1516	>	}
1517	>	if (insertAtFront) {
1518	>	++added;
1519	>	p.next = first;
1520	>	setTabAt(tab, j, p);
1521	>	}
1522	>	p = next;
1523	>	}
1524	>	table = tab;
1525	>	sizeCtl = n - (n >>> 2);
1526	>	baseCount = added;
1527		}
1528	+	}
1529
1530	<	@SuppressWarnings("unchecked")
1531	<	public final K next() {
1532	<	if (nextVal == null && advance() == null)
1533	<	throw new NoSuchElementException();
1534	<	Object k = nextKey;
1535	<	nextVal = null;
1536	<	return (K) k;
1530	>	// ConcurrentMap methods
1531	>
1532	>	/**
1533	>	* {@inheritDoc}
1534	>	*
1535	>	* @return the previous value associated with the specified key,
1536	>	*         or {@code null} if there was no mapping for the key
1537	>	* @throws NullPointerException if the specified key or value is null
1538	>	*/
1539	>	public V putIfAbsent(K key, V value) {
1540	>	return putVal(key, value, true);
1541	>	}
1542	>
1543	>	/**
1544	>	* {@inheritDoc}
1545	>	*
1546	>	* @throws NullPointerException if the specified key is null
1547	>	*/
1548	>	public boolean remove(Object key, Object value) {
1549	>	if (key == null)
1550	>	throw new NullPointerException();
1551	>	return value != null && replaceNode(key, null, value) != null;
1552	>	}
1553	>
1554	>	/**
1555	>	* {@inheritDoc}
1556	>	*
1557	>	* @throws NullPointerException if any of the arguments are null
1558	>	*/
1559	>	public boolean replace(K key, V oldValue, V newValue) {
1560	>	if (key == null || oldValue == null || newValue == null)
1561	>	throw new NullPointerException();
1562	>	return replaceNode(key, newValue, oldValue) != null;
1563	>	}
1564	>
1565	>	/**
1566	>	* {@inheritDoc}
1567	>	*
1568	>	* @return the previous value associated with the specified key,
1569	>	*         or {@code null} if there was no mapping for the key
1570	>	* @throws NullPointerException if the specified key or value is null
1571	>	*/
1572	>	public V replace(K key, V value) {
1573	>	if (key == null || value == null)
1574	>	throw new NullPointerException();
1575	>	return replaceNode(key, value, null);
1576	>	}
1577	>
1578	>	// Overrides of JDK8+ Map extension method defaults
1579	>
1580	>	/**
1581	>	* Returns the value to which the specified key is mapped, or the
1582	>	* given default value if this map contains no mapping for the
1583	>	* key.
1584	>	*
1585	>	* @param key the key whose associated value is to be returned
1586	>	* @param defaultValue the value to return if this map contains
1587	>	* no mapping for the given key
1588	>	* @return the mapping for the key, if present; else the default value
1589	>	* @throws NullPointerException if the specified key is null
1590	>	*/
1591	>	public V getOrDefault(Object key, V defaultValue) {
1592	>	V v;
1593	>	return (v = get(key)) == null ? defaultValue : v;
1594	>	}
1595	>
1596	>	public void forEach(BiAction<? super K, ? super V> action) {
1597	>	if (action == null) throw new NullPointerException();
1598	>	Node<K,V>[] t;
1599	>	if ((t = table) != null) {
1600	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1601	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1602	>	action.apply(p.key, p.val);
1603	>	}
1604		}
1605	+	}
1606
1607	<	public final K nextElement() { return next(); }
1607	>	public void replaceAll(BiFun<? super K, ? super V, ? extends V> function) {
1608	>	if (function == null) throw new NullPointerException();
1609	>	Node<K,V>[] t;
1610	>	if ((t = table) != null) {
1611	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
1612	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
1613	>	V oldValue = p.val;
1614	>	for (K key = p.key;;) {
1615	>	V newValue = function.apply(key, oldValue);
1616	>	if (newValue == null)
1617	>	throw new NullPointerException();
1618	>	if (replaceNode(key, newValue, oldValue) != null ||
1619	>	(oldValue = get(key)) == null)
1620	>	break;
1621	>	}
1622	>	}
1623	>	}
1624		}
1625
1626	<	static final class ValueIterator<K,V> extends InternalIterator<K,V>
1627	<	implements Spliterator<V>, Enumeration<V> {
1628	<	ValueIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
1629	<	ValueIterator(InternalIterator<K,V> it, boolean split) {
1630	<	super(it, split);
1626	>	/**
1627	>	* If the specified key is not already associated with a value,
1628	>	* attempts to compute its value using the given mapping function
1629	>	* and enters it into this map unless {@code null}.  The entire
1630	>	* method invocation is performed atomically, so the function is
1631	>	* applied at most once per key.  Some attempted update operations
1632	>	* on this map by other threads may be blocked while computation
1633	>	* is in progress, so the computation should be short and simple,
1634	>	* and must not attempt to update any other mappings of this map.
1635	>	*
1636	>	* @param key key with which the specified value is to be associated
1637	>	* @param mappingFunction the function to compute a value
1638	>	* @return the current (existing or computed) value associated with
1639	>	*         the specified key, or null if the computed value is null
1640	>	* @throws NullPointerException if the specified key or mappingFunction
1641	>	*         is null
1642	>	* @throws IllegalStateException if the computation detectably
1643	>	*         attempts a recursive update to this map that would
1644	>	*         otherwise never complete
1645	>	* @throws RuntimeException or Error if the mappingFunction does so,
1646	>	*         in which case the mapping is left unestablished
1647	>	*/
1648	>	public V computeIfAbsent(K key, Fun<? super K, ? extends V> mappingFunction) {
1649	>	if (key == null || mappingFunction == null)
1650	>	throw new NullPointerException();
1651	>	int h = spread(key.hashCode());
1652	>	V val = null;
1653	>	int binCount = 0;
1654	>	for (Node<K,V>[] tab = table;;) {
1655	>	Node<K,V> f; int n, i, fh;
1656	>	if (tab == null || (n = tab.length) == 0)
1657	>	tab = initTable();
1658	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1659	>	Node<K,V> r = new ReservationNode<K,V>();
1660	>	synchronized (r) {
1661	>	if (casTabAt(tab, i, null, r)) {
1662	>	binCount = 1;
1663	>	Node<K,V> node = null;
1664	>	try {
1665	>	if ((val = mappingFunction.apply(key)) != null)
1666	>	node = new Node<K,V>(h, key, val, null);
1667	>	} finally {
1668	>	setTabAt(tab, i, node);
1669	>	}
1670	>	}
1671	>	}
1672	>	if (binCount != 0)
1673	>	break;
1674	>	}
1675	>	else if ((fh = f.hash) == MOVED)
1676	>	tab = helpTransfer(tab, f);
1677	>	else {
1678	>	boolean added = false;
1679	>	synchronized (f) {
1680	>	if (tabAt(tab, i) == f) {
1681	>	if (fh >= 0) {
1682	>	binCount = 1;
1683	>	for (Node<K,V> e = f;; ++binCount) {
1684	>	K ek; V ev;
1685	>	if (e.hash == h &&
1686	>	((ek = e.key) == key ||
1687	>	(ek != null && key.equals(ek)))) {
1688	>	val = e.val;
1689	>	break;
1690	>	}
1691	>	Node<K,V> pred = e;
1692	>	if ((e = e.next) == null) {
1693	>	if ((val = mappingFunction.apply(key)) != null) {
1694	>	added = true;
1695	>	pred.next = new Node<K,V>(h, key, val, null);
1696	>	}
1697	>	break;
1698	>	}
1699	>	}
1700	>	}
1701	>	else if (f instanceof TreeBin) {
1702	>	binCount = 2;
1703	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1704	>	TreeNode<K,V> r, p;
1705	>	if ((r = t.root) != null &&
1706	>	(p = r.findTreeNode(h, key, null)) != null)
1707	>	val = p.val;
1708	>	else if ((val = mappingFunction.apply(key)) != null) {
1709	>	added = true;
1710	>	t.putTreeVal(h, key, val);
1711	>	}
1712	>	}
1713	>	}
1714	>	}
1715	>	if (binCount != 0) {
1716	>	if (binCount >= TREEIFY_THRESHOLD)
1717	>	treeifyBin(tab, i);
1718	>	if (!added)
1719	>	return val;
1720	>	break;
1721	>	}
1722	>	}
1723		}
1724	<	public ValueIterator<K,V> split() {
1725	<	if (last != null || (next != null && nextVal == null))
1726	<	throw new IllegalStateException();
1727	<	return new ValueIterator<K,V>(this, true);
1724	>	if (val != null)
1725	>	addCount(1L, binCount);
1726	>	return val;
1727	>	}
1728	>
1729	>	/**
1730	>	* If the value for the specified key is present, attempts to
1731	>	* compute a new mapping given the key and its current mapped
1732	>	* value.  The entire method invocation is performed atomically.
1733	>	* Some attempted update operations on this map by other threads
1734	>	* may be blocked while computation is in progress, so the
1735	>	* computation should be short and simple, and must not attempt to
1736	>	* update any other mappings of this map.
1737	>	*
1738	>	* @param key key with which a value may be associated
1739	>	* @param remappingFunction the function to compute a value
1740	>	* @return the new value associated with the specified key, or null if none
1741	>	* @throws NullPointerException if the specified key or remappingFunction
1742	>	*         is null
1743	>	* @throws IllegalStateException if the computation detectably
1744	>	*         attempts a recursive update to this map that would
1745	>	*         otherwise never complete
1746	>	* @throws RuntimeException or Error if the remappingFunction does so,
1747	>	*         in which case the mapping is unchanged
1748	>	*/
1749	>	public V computeIfPresent(K key, BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1750	>	if (key == null || remappingFunction == null)
1751	>	throw new NullPointerException();
1752	>	int h = spread(key.hashCode());
1753	>	V val = null;
1754	>	int delta = 0;
1755	>	int binCount = 0;
1756	>	for (Node<K,V>[] tab = table;;) {
1757	>	Node<K,V> f; int n, i, fh;
1758	>	if (tab == null || (n = tab.length) == 0)
1759	>	tab = initTable();
1760	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null)
1761	>	break;
1762	>	else if ((fh = f.hash) == MOVED)
1763	>	tab = helpTransfer(tab, f);
1764	>	else {
1765	>	synchronized (f) {
1766	>	if (tabAt(tab, i) == f) {
1767	>	if (fh >= 0) {
1768	>	binCount = 1;
1769	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1770	>	K ek;
1771	>	if (e.hash == h &&
1772	>	((ek = e.key) == key ||
1773	>	(ek != null && key.equals(ek)))) {
1774	>	val = remappingFunction.apply(key, e.val);
1775	>	if (val != null)
1776	>	e.val = val;
1777	>	else {
1778	>	delta = -1;
1779	>	Node<K,V> en = e.next;
1780	>	if (pred != null)
1781	>	pred.next = en;
1782	>	else
1783	>	setTabAt(tab, i, en);
1784	>	}
1785	>	break;
1786	>	}
1787	>	pred = e;
1788	>	if ((e = e.next) == null)
1789	>	break;
1790	>	}
1791	>	}
1792	>	else if (f instanceof TreeBin) {
1793	>	binCount = 2;
1794	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1795	>	TreeNode<K,V> r, p;
1796	>	if ((r = t.root) != null &&
1797	>	(p = r.findTreeNode(h, key, null)) != null) {
1798	>	val = remappingFunction.apply(key, p.val);
1799	>	if (val != null)
1800	>	p.val = val;
1801	>	else {
1802	>	delta = -1;
1803	>	if (t.removeTreeNode(p))
1804	>	setTabAt(tab, i, untreeify(t.first));
1805	>	}
1806	>	}
1807	>	}
1808	>	}
1809	>	}
1810	>	if (binCount != 0)
1811	>	break;
1812	>	}
1813	>	}
1814	>	if (delta != 0)
1815	>	addCount((long)delta, binCount);
1816	>	return val;
1817	>	}
1818	>
1819	>	/**
1820	>	* Attempts to compute a mapping for the specified key and its
1821	>	* current mapped value (or {@code null} if there is no current
1822	>	* mapping). The entire method invocation is performed atomically.
1823	>	* Some attempted update operations on this map by other threads
1824	>	* may be blocked while computation is in progress, so the
1825	>	* computation should be short and simple, and must not attempt to
1826	>	* update any other mappings of this Map.
1827	>	*
1828	>	* @param key key with which the specified value is to be associated
1829	>	* @param remappingFunction the function to compute a value
1830	>	* @return the new value associated with the specified key, or null if none
1831	>	* @throws NullPointerException if the specified key or remappingFunction
1832	>	*         is null
1833	>	* @throws IllegalStateException if the computation detectably
1834	>	*         attempts a recursive update to this map that would
1835	>	*         otherwise never complete
1836	>	* @throws RuntimeException or Error if the remappingFunction does so,
1837	>	*         in which case the mapping is unchanged
1838	>	*/
1839	>	public V compute(K key,
1840	>	BiFun<? super K, ? super V, ? extends V> remappingFunction) {
1841	>	if (key == null || remappingFunction == null)
1842	>	throw new NullPointerException();
1843	>	int h = spread(key.hashCode());
1844	>	V val = null;
1845	>	int delta = 0;
1846	>	int binCount = 0;
1847	>	for (Node<K,V>[] tab = table;;) {
1848	>	Node<K,V> f; int n, i, fh;
1849	>	if (tab == null || (n = tab.length) == 0)
1850	>	tab = initTable();
1851	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1852	>	Node<K,V> r = new ReservationNode<K,V>();
1853	>	synchronized (r) {
1854	>	if (casTabAt(tab, i, null, r)) {
1855	>	binCount = 1;
1856	>	Node<K,V> node = null;
1857	>	try {
1858	>	if ((val = remappingFunction.apply(key, null)) != null) {
1859	>	delta = 1;
1860	>	node = new Node<K,V>(h, key, val, null);
1861	>	}
1862	>	} finally {
1863	>	setTabAt(tab, i, node);
1864	>	}
1865	>	}
1866	>	}
1867	>	if (binCount != 0)
1868	>	break;
1869	>	}
1870	>	else if ((fh = f.hash) == MOVED)
1871	>	tab = helpTransfer(tab, f);
1872	>	else {
1873	>	synchronized (f) {
1874	>	if (tabAt(tab, i) == f) {
1875	>	if (fh >= 0) {
1876	>	binCount = 1;
1877	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1878	>	K ek;
1879	>	if (e.hash == h &&
1880	>	((ek = e.key) == key ||
1881	>	(ek != null && key.equals(ek)))) {
1882	>	val = remappingFunction.apply(key, e.val);
1883	>	if (val != null)
1884	>	e.val = val;
1885	>	else {
1886	>	delta = -1;
1887	>	Node<K,V> en = e.next;
1888	>	if (pred != null)
1889	>	pred.next = en;
1890	>	else
1891	>	setTabAt(tab, i, en);
1892	>	}
1893	>	break;
1894	>	}
1895	>	pred = e;
1896	>	if ((e = e.next) == null) {
1897	>	val = remappingFunction.apply(key, null);
1898	>	if (val != null) {
1899	>	delta = 1;
1900	>	pred.next =
1901	>	new Node<K,V>(h, key, val, null);
1902	>	}
1903	>	break;
1904	>	}
1905	>	}
1906	>	}
1907	>	else if (f instanceof TreeBin) {
1908	>	binCount = 1;
1909	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
1910	>	TreeNode<K,V> r, p;
1911	>	if ((r = t.root) != null)
1912	>	p = r.findTreeNode(h, key, null);
1913	>	else
1914	>	p = null;
1915	>	V pv = (p == null) ? null : p.val;
1916	>	val = remappingFunction.apply(key, pv);
1917	>	if (val != null) {
1918	>	if (p != null)
1919	>	p.val = val;
1920	>	else {
1921	>	delta = 1;
1922	>	t.putTreeVal(h, key, val);
1923	>	}
1924	>	}
1925	>	else if (p != null) {
1926	>	delta = -1;
1927	>	if (t.removeTreeNode(p))
1928	>	setTabAt(tab, i, untreeify(t.first));
1929	>	}
1930	>	}
1931	>	}
1932	>	}
1933	>	if (binCount != 0) {
1934	>	if (binCount >= TREEIFY_THRESHOLD)
1935	>	treeifyBin(tab, i);
1936	>	break;
1937	>	}
1938	>	}
1939	>	}
1940	>	if (delta != 0)
1941	>	addCount((long)delta, binCount);
1942	>	return val;
1943	>	}
1944	>
1945	>	/**
1946	>	* If the specified key is not already associated with a
1947	>	* (non-null) value, associates it with the given value.
1948	>	* Otherwise, replaces the value with the results of the given
1949	>	* remapping function, or removes if {@code null}. The entire
1950	>	* method invocation is performed atomically.  Some attempted
1951	>	* update operations on this map by other threads may be blocked
1952	>	* while computation is in progress, so the computation should be
1953	>	* short and simple, and must not attempt to update any other
1954	>	* mappings of this Map.
1955	>	*
1956	>	* @param key key with which the specified value is to be associated
1957	>	* @param value the value to use if absent
1958	>	* @param remappingFunction the function to recompute a value if present
1959	>	* @return the new value associated with the specified key, or null if none
1960	>	* @throws NullPointerException if the specified key or the
1961	>	*         remappingFunction is null
1962	>	* @throws RuntimeException or Error if the remappingFunction does so,
1963	>	*         in which case the mapping is unchanged
1964	>	*/
1965	>	public V merge(K key, V value, BiFun<? super V, ? super V, ? extends V> remappingFunction) {
1966	>	if (key == null || value == null || remappingFunction == null)
1967	>	throw new NullPointerException();
1968	>	int h = spread(key.hashCode());
1969	>	V val = null;
1970	>	int delta = 0;
1971	>	int binCount = 0;
1972	>	for (Node<K,V>[] tab = table;;) {
1973	>	Node<K,V> f; int n, i, fh;
1974	>	if (tab == null || (n = tab.length) == 0)
1975	>	tab = initTable();
1976	>	else if ((f = tabAt(tab, i = (n - 1) & h)) == null) {
1977	>	if (casTabAt(tab, i, null, new Node<K,V>(h, key, value, null))) {
1978	>	delta = 1;
1979	>	val = value;
1980	>	break;
1981	>	}
1982	>	}
1983	>	else if ((fh = f.hash) == MOVED)
1984	>	tab = helpTransfer(tab, f);
1985	>	else {
1986	>	synchronized (f) {
1987	>	if (tabAt(tab, i) == f) {
1988	>	if (fh >= 0) {
1989	>	binCount = 1;
1990	>	for (Node<K,V> e = f, pred = null;; ++binCount) {
1991	>	K ek;
1992	>	if (e.hash == h &&
1993	>	((ek = e.key) == key ||
1994	>	(ek != null && key.equals(ek)))) {
1995	>	val = remappingFunction.apply(e.val, value);
1996	>	if (val != null)
1997	>	e.val = val;
1998	>	else {
1999	>	delta = -1;
2000	>	Node<K,V> en = e.next;
2001	>	if (pred != null)
2002	>	pred.next = en;
2003	>	else
2004	>	setTabAt(tab, i, en);
2005	>	}
2006	>	break;
2007	>	}
2008	>	pred = e;
2009	>	if ((e = e.next) == null) {
2010	>	delta = 1;
2011	>	val = value;
2012	>	pred.next =
2013	>	new Node<K,V>(h, key, val, null);
2014	>	break;
2015	>	}
2016	>	}
2017	>	}
2018	>	else if (f instanceof TreeBin) {
2019	>	binCount = 2;
2020	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2021	>	TreeNode<K,V> r = t.root;
2022	>	TreeNode<K,V> p = (r == null) ? null :
2023	>	r.findTreeNode(h, key, null);
2024	>	val = (p == null) ? value :
2025	>	remappingFunction.apply(p.val, value);
2026	>	if (val != null) {
2027	>	if (p != null)
2028	>	p.val = val;
2029	>	else {
2030	>	delta = 1;
2031	>	t.putTreeVal(h, key, val);
2032	>	}
2033	>	}
2034	>	else if (p != null) {
2035	>	delta = -1;
2036	>	if (t.removeTreeNode(p))
2037	>	setTabAt(tab, i, untreeify(t.first));
2038	>	}
2039	>	}
2040	>	}
2041	>	}
2042	>	if (binCount != 0) {
2043	>	if (binCount >= TREEIFY_THRESHOLD)
2044	>	treeifyBin(tab, i);
2045	>	break;
2046	>	}
2047	>	}
2048	>	}
2049	>	if (delta != 0)
2050	>	addCount((long)delta, binCount);
2051	>	return val;
2052	>	}
2053	>
2054	>	// Hashtable legacy methods
2055	>
2056	>	/**
2057	>	* Legacy method testing if some key maps into the specified value
2058	>	* in this table.  This method is identical in functionality to
2059	>	* {@link #containsValue(Object)}, and exists solely to ensure
2060	>	* full compatibility with class {@link java.util.Hashtable},
2061	>	* which supported this method prior to introduction of the
2062	>	* Java Collections framework.
2063	>	*
2064	>	* @param  value a value to search for
2065	>	* @return {@code true} if and only if some key maps to the
2066	>	*         {@code value} argument in this table as
2067	>	*         determined by the {@code equals} method;
2068	>	*         {@code false} otherwise
2069	>	* @throws NullPointerException if the specified value is null
2070	>	*/
2071	>	@Deprecated public boolean contains(Object value) {
2072	>	return containsValue(value);
2073	>	}
2074	>
2075	>	/**
2076	>	* Returns an enumeration of the keys in this table.
2077	>	*
2078	>	* @return an enumeration of the keys in this table
2079	>	* @see #keySet()
2080	>	*/
2081	>	public Enumeration<K> keys() {
2082	>	Node<K,V>[] t;
2083	>	int f = (t = table) == null ? 0 : t.length;
2084	>	return new KeyIterator<K,V>(t, f, 0, f, this);
2085	>	}
2086	>
2087	>	/**
2088	>	* Returns an enumeration of the values in this table.
2089	>	*
2090	>	* @return an enumeration of the values in this table
2091	>	* @see #values()
2092	>	*/
2093	>	public Enumeration<V> elements() {
2094	>	Node<K,V>[] t;
2095	>	int f = (t = table) == null ? 0 : t.length;
2096	>	return new ValueIterator<K,V>(t, f, 0, f, this);
2097	>	}
2098	>
2099	>	// ConcurrentHashMapV8-only methods
2100	>
2101	>	/**
2102	>	* Returns the number of mappings. This method should be used
2103	>	* instead of {@link #size} because a ConcurrentHashMapV8 may
2104	>	* contain more mappings than can be represented as an int. The
2105	>	* value returned is an estimate; the actual count may differ if
2106	>	* there are concurrent insertions or removals.
2107	>	*
2108	>	* @return the number of mappings
2109	>	* @since 1.8
2110	>	*/
2111	>	public long mappingCount() {
2112	>	long n = sumCount();
2113	>	return (n < 0L) ? 0L : n; // ignore transient negative values
2114	>	}
2115	>
2116	>	/**
2117	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2118	>	* from the given type to {@code Boolean.TRUE}.
2119	>	*
2120	>	* @return the new set
2121	>	* @since 1.8
2122	>	*/
2123	>	public static <K> KeySetView<K,Boolean> newKeySet() {
2124	>	return new KeySetView<K,Boolean>
2125	>	(new ConcurrentHashMapV8<K,Boolean>(), Boolean.TRUE);
2126	>	}
2127	>
2128	>	/**
2129	>	* Creates a new {@link Set} backed by a ConcurrentHashMapV8
2130	>	* from the given type to {@code Boolean.TRUE}.
2131	>	*
2132	>	* @param initialCapacity The implementation performs internal
2133	>	* sizing to accommodate this many elements.
2134	>	* @return the new set
2135	>	* @throws IllegalArgumentException if the initial capacity of
2136	>	* elements is negative
2137	>	* @since 1.8
2138	>	*/
2139	>	public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) {
2140	>	return new KeySetView<K,Boolean>
2141	>	(new ConcurrentHashMapV8<K,Boolean>(initialCapacity), Boolean.TRUE);
2142	>	}
2143	>
2144	>	/**
2145	>	* Returns a {@link Set} view of the keys in this map, using the
2146	>	* given common mapped value for any additions (i.e., {@link
2147	>	* Collection#add} and {@link Collection#addAll(Collection)}).
2148	>	* This is of course only appropriate if it is acceptable to use
2149	>	* the same value for all additions from this view.
2150	>	*
2151	>	* @param mappedValue the mapped value to use for any additions
2152	>	* @return the set view
2153	>	* @throws NullPointerException if the mappedValue is null
2154	>	*/
2155	>	public KeySetView<K,V> keySet(V mappedValue) {
2156	>	if (mappedValue == null)
2157	>	throw new NullPointerException();
2158	>	return new KeySetView<K,V>(this, mappedValue);
2159	>	}
2160	>
2161	>	/* ---------------- Special Nodes -------------- */
2162	>
2163	>	/**
2164	>	* A node inserted at head of bins during transfer operations.
2165	>	*/
2166	>	static final class ForwardingNode<K,V> extends Node<K,V> {
2167	>	final Node<K,V>[] nextTable;
2168	>	ForwardingNode(Node<K,V>[] tab) {
2169	>	super(MOVED, null, null, null);
2170	>	this.nextTable = tab;
2171	>	}
2172	>
2173	>	Node<K,V> find(int h, Object k) {
2174	>	// loop to avoid arbitrarily deep recursion on forwarding nodes
2175	>	outer: for (Node<K,V>[] tab = nextTable;;) {
2176	>	Node<K,V> e; int n;
2177	>	if (k == null || tab == null || (n = tab.length) == 0 ||
2178	>	(e = tabAt(tab, (n - 1) & h)) == null)
2179	>	return null;
2180	>	for (;;) {
2181	>	int eh; K ek;
2182	>	if ((eh = e.hash) == h &&
2183	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2184	>	return e;
2185	>	if (eh < 0) {
2186	>	if (e instanceof ForwardingNode) {
2187	>	tab = ((ForwardingNode<K,V>)e).nextTable;
2188	>	continue outer;
2189	>	}
2190	>	else
2191	>	return e.find(h, k);
2192	>	}
2193	>	if ((e = e.next) == null)
2194	>	return null;
2195	>	}
2196	>	}
2197	>	}
2198	>	}
2199	>
2200	>	/**
2201	>	* A place-holder node used in computeIfAbsent and compute
2202	>	*/
2203	>	static final class ReservationNode<K,V> extends Node<K,V> {
2204	>	ReservationNode() {
2205	>	super(RESERVED, null, null, null);
2206	>	}
2207	>
2208	>	Node<K,V> find(int h, Object k) {
2209	>	return null;
2210	>	}
2211	>	}
2212	>
2213	>	/* ---------------- Table Initialization and Resizing -------------- */
2214	>
2215	>	/**
2216	>	* Returns the stamp bits for resizing a table of size n.
2217	>	* Must be negative when shifted left by RESIZE_STAMP_SHIFT.
2218	>	*/
2219	>	static final int resizeStamp(int n) {
2220	>	return Integer.numberOfLeadingZeros(n) | (1 << (RESIZE_STAMP_BITS - 1));
2221	>	}
2222	>
2223	>	/**
2224	>	* Initializes table, using the size recorded in sizeCtl.
2225	>	*/
2226	>	private final Node<K,V>[] initTable() {
2227	>	Node<K,V>[] tab; int sc;
2228	>	while ((tab = table) == null || tab.length == 0) {
2229	>	if ((sc = sizeCtl) < 0)
2230	>	Thread.yield(); // lost initialization race; just spin
2231	>	else if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2232	>	try {
2233	>	if ((tab = table) == null || tab.length == 0) {
2234	>	int n = (sc > 0) ? sc : DEFAULT_CAPACITY;
2235	>	@SuppressWarnings("unchecked")
2236	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2237	>	table = tab = nt;
2238	>	sc = n - (n >>> 2);
2239	>	}
2240	>	} finally {
2241	>	sizeCtl = sc;
2242	>	}
2243	>	break;
2244	>	}
2245	>	}
2246	>	return tab;
2247	>	}
2248	>
2249	>	/**
2250	>	* Adds to count, and if table is too small and not already
2251	>	* resizing, initiates transfer. If already resizing, helps
2252	>	* perform transfer if work is available.  Rechecks occupancy
2253	>	* after a transfer to see if another resize is already needed
2254	>	* because resizings are lagging additions.
2255	>	*
2256	>	* @param x the count to add
2257	>	* @param check if <0, don't check resize, if <= 1 only check if uncontended
2258	>	*/
2259	>	private final void addCount(long x, int check) {
2260	>	CounterCell[] as; long b, s;
2261	>	if ((as = counterCells) != null ||
2262	>	!U.compareAndSwapLong(this, BASECOUNT, b = baseCount, s = b + x)) {
2263	>	CounterHashCode hc; CounterCell a; long v; int m;
2264	>	boolean uncontended = true;
2265	>	if ((hc = threadCounterHashCode.get()) == null ||
2266	>	as == null || (m = as.length - 1) < 0 ||
2267	>	(a = as[m & hc.code]) == null ||
2268	>	!(uncontended =
2269	>	U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))) {
2270	>	fullAddCount(x, hc, uncontended);
2271	>	return;
2272	>	}
2273	>	if (check <= 1)
2274	>	return;
2275	>	s = sumCount();
2276	>	}
2277	>	if (check >= 0) {
2278	>	Node<K,V>[] tab, nt; int n, sc;
2279	>	while (s >= (long)(sc = sizeCtl) && (tab = table) != null &&
2280	>	(n = tab.length) < MAXIMUM_CAPACITY) {
2281	>	int rs = resizeStamp(n);
2282	>	if (sc < 0) {
2283	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2284	>	sc == rs + MAX_RESIZERS || (nt = nextTable) == null ||
2285	>	transferIndex <= 0)
2286	>	break;
2287	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1))
2288	>	transfer(tab, nt);
2289	>	}
2290	>	else if (U.compareAndSwapInt(this, SIZECTL, sc,
2291	>	(rs << RESIZE_STAMP_SHIFT) + 2))
2292	>	transfer(tab, null);
2293	>	s = sumCount();
2294	>	}
2295	>	}
2296	>	}
2297	>
2298	>	/**
2299	>	* Helps transfer if a resize is in progress.
2300	>	*/
2301	>	final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) {
2302	>	Node<K,V>[] nextTab; int sc;
2303	>	if (tab != null && (f instanceof ForwardingNode) &&
2304	>	(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) {
2305	>	int rs = resizeStamp(tab.length);
2306	>	while (nextTab == nextTable && table == tab &&
2307	>	(sc = sizeCtl) < 0) {
2308	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2309	>	sc == rs + MAX_RESIZERS || transferIndex <= 0)
2310	>	break;
2311	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1)) {
2312	>	transfer(tab, nextTab);
2313	>	break;
2314	>	}
2315	>	}
2316	>	return nextTab;
2317	>	}
2318	>	return table;
2319	>	}
2320	>
2321	>	/**
2322	>	* Tries to presize table to accommodate the given number of elements.
2323	>	*
2324	>	* @param size number of elements (doesn't need to be perfectly accurate)
2325	>	*/
2326	>	private final void tryPresize(int size) {
2327	>	int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
2328	>	tableSizeFor(size + (size >>> 1) + 1);
2329	>	int sc;
2330	>	while ((sc = sizeCtl) >= 0) {
2331	>	Node<K,V>[] tab = table; int n;
2332	>	if (tab == null || (n = tab.length) == 0) {
2333	>	n = (sc > c) ? sc : c;
2334	>	if (U.compareAndSwapInt(this, SIZECTL, sc, -1)) {
2335	>	try {
2336	>	if (table == tab) {
2337	>	@SuppressWarnings("unchecked")
2338	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n];
2339	>	table = nt;
2340	>	sc = n - (n >>> 2);
2341	>	}
2342	>	} finally {
2343	>	sizeCtl = sc;
2344	>	}
2345	>	}
2346	>	}
2347	>	else if (c <= sc || n >= MAXIMUM_CAPACITY)
2348	>	break;
2349	>	else if (tab == table) {
2350	>	int rs = resizeStamp(n);
2351	>	if (sc < 0) {
2352	>	Node<K,V>[] nt;
2353	>	if ((sc >>> RESIZE_STAMP_SHIFT) != rs || sc == rs + 1 ||
2354	>	sc == rs + MAX_RESIZERS || (nt = nextTable) == null ||
2355	>	transferIndex <= 0)
2356	>	break;
2357	>	if (U.compareAndSwapInt(this, SIZECTL, sc, sc + 1))
2358	>	transfer(tab, nt);
2359	>	}
2360	>	else if (U.compareAndSwapInt(this, SIZECTL, sc,
2361	>	(rs << RESIZE_STAMP_SHIFT) + 2))
2362	>	transfer(tab, null);
2363	>	}
2364	>	}
2365	>	}
2366	>
2367	>	/**
2368	>	* Moves and/or copies the nodes in each bin to new table. See
2369	>	* above for explanation.
2370	>	*/
2371	>	private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) {
2372	>	int n = tab.length, stride;
2373	>	if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE)
2374	>	stride = MIN_TRANSFER_STRIDE; // subdivide range
2375	>	if (nextTab == null) {            // initiating
2376	>	try {
2377	>	@SuppressWarnings("unchecked")
2378	>	Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n << 1];
2379	>	nextTab = nt;
2380	>	} catch (Throwable ex) {      // try to cope with OOME
2381	>	sizeCtl = Integer.MAX_VALUE;
2382	>	return;
2383	>	}
2384	>	nextTable = nextTab;
2385	>	transferIndex = n;
2386	>	}
2387	>	int nextn = nextTab.length;
2388	>	ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab);
2389	>	boolean advance = true;
2390	>	boolean finishing = false; // to ensure sweep before committing nextTab
2391	>	for (int i = 0, bound = 0;;) {
2392	>	Node<K,V> f; int fh;
2393	>	while (advance) {
2394	>	int nextIndex, nextBound;
2395	>	if (--i >= bound || finishing)
2396	>	advance = false;
2397	>	else if ((nextIndex = transferIndex) <= 0) {
2398	>	i = -1;
2399	>	advance = false;
2400	>	}
2401	>	else if (U.compareAndSwapInt
2402	>	(this, TRANSFERINDEX, nextIndex,
2403	>	nextBound = (nextIndex > stride ?
2404	>	nextIndex - stride : 0))) {
2405	>	bound = nextBound;
2406	>	i = nextIndex - 1;
2407	>	advance = false;
2408	>	}
2409	>	}
2410	>	if (i < 0 || i >= n || i + n >= nextn) {
2411	>	int sc;
2412	>	if (finishing) {
2413	>	nextTable = null;
2414	>	table = nextTab;
2415	>	sizeCtl = (n << 1) - (n >>> 1);
2416	>	return;
2417	>	}
2418	>	if (U.compareAndSwapInt(this, SIZECTL, sc = sizeCtl, sc - 1)) {
2419	>	if ((sc - 2) != resizeStamp(n) << RESIZE_STAMP_SHIFT)
2420	>	return;
2421	>	finishing = advance = true;
2422	>	i = n; // recheck before commit
2423	>	}
2424	>	}
2425	>	else if ((f = tabAt(tab, i)) == null)
2426	>	advance = casTabAt(tab, i, null, fwd);
2427	>	else if ((fh = f.hash) == MOVED)
2428	>	advance = true; // already processed
2429	>	else {
2430	>	synchronized (f) {
2431	>	if (tabAt(tab, i) == f) {
2432	>	Node<K,V> ln, hn;
2433	>	if (fh >= 0) {
2434	>	int runBit = fh & n;
2435	>	Node<K,V> lastRun = f;
2436	>	for (Node<K,V> p = f.next; p != null; p = p.next) {
2437	>	int b = p.hash & n;
2438	>	if (b != runBit) {
2439	>	runBit = b;
2440	>	lastRun = p;
2441	>	}
2442	>	}
2443	>	if (runBit == 0) {
2444	>	ln = lastRun;
2445	>	hn = null;
2446	>	}
2447	>	else {
2448	>	hn = lastRun;
2449	>	ln = null;
2450	>	}
2451	>	for (Node<K,V> p = f; p != lastRun; p = p.next) {
2452	>	int ph = p.hash; K pk = p.key; V pv = p.val;
2453	>	if ((ph & n) == 0)
2454	>	ln = new Node<K,V>(ph, pk, pv, ln);
2455	>	else
2456	>	hn = new Node<K,V>(ph, pk, pv, hn);
2457	>	}
2458	>	setTabAt(nextTab, i, ln);
2459	>	setTabAt(nextTab, i + n, hn);
2460	>	setTabAt(tab, i, fwd);
2461	>	advance = true;
2462	>	}
2463	>	else if (f instanceof TreeBin) {
2464	>	TreeBin<K,V> t = (TreeBin<K,V>)f;
2465	>	TreeNode<K,V> lo = null, loTail = null;
2466	>	TreeNode<K,V> hi = null, hiTail = null;
2467	>	int lc = 0, hc = 0;
2468	>	for (Node<K,V> e = t.first; e != null; e = e.next) {
2469	>	int h = e.hash;
2470	>	TreeNode<K,V> p = new TreeNode<K,V>
2471	>	(h, e.key, e.val, null, null);
2472	>	if ((h & n) == 0) {
2473	>	if ((p.prev = loTail) == null)
2474	>	lo = p;
2475	>	else
2476	>	loTail.next = p;
2477	>	loTail = p;
2478	>	++lc;
2479	>	}
2480	>	else {
2481	>	if ((p.prev = hiTail) == null)
2482	>	hi = p;
2483	>	else
2484	>	hiTail.next = p;
2485	>	hiTail = p;
2486	>	++hc;
2487	>	}
2488	>	}
2489	>	ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) :
2490	>	(hc != 0) ? new TreeBin<K,V>(lo) : t;
2491	>	hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) :
2492	>	(lc != 0) ? new TreeBin<K,V>(hi) : t;
2493	>	setTabAt(nextTab, i, ln);
2494	>	setTabAt(nextTab, i + n, hn);
2495	>	setTabAt(tab, i, fwd);
2496	>	advance = true;
2497	>	}
2498	>	}
2499	>	}
2500	>	}
2501	>	}
2502	>	}
2503	>
2504	>	/* ---------------- Conversion from/to TreeBins -------------- */
2505	>
2506	>	/**
2507	>	* Replaces all linked nodes in bin at given index unless table is
2508	>	* too small, in which case resizes instead.
2509	>	*/
2510	>	private final void treeifyBin(Node<K,V>[] tab, int index) {
2511	>	Node<K,V> b; int n, sc;
2512	>	if (tab != null) {
2513	>	if ((n = tab.length) < MIN_TREEIFY_CAPACITY)
2514	>	tryPresize(n << 1);
2515	>	else if ((b = tabAt(tab, index)) != null && b.hash >= 0) {
2516	>	synchronized (b) {
2517	>	if (tabAt(tab, index) == b) {
2518	>	TreeNode<K,V> hd = null, tl = null;
2519	>	for (Node<K,V> e = b; e != null; e = e.next) {
2520	>	TreeNode<K,V> p =
2521	>	new TreeNode<K,V>(e.hash, e.key, e.val,
2522	>	null, null);
2523	>	if ((p.prev = tl) == null)
2524	>	hd = p;
2525	>	else
2526	>	tl.next = p;
2527	>	tl = p;
2528	>	}
2529	>	setTabAt(tab, index, new TreeBin<K,V>(hd));
2530	>	}
2531	>	}
2532	>	}
2533	>	}
2534	>	}
2535	>
2536	>	/**
2537	>	* Returns a list on non-TreeNodes replacing those in given list.
2538	>	*/
2539	>	static <K,V> Node<K,V> untreeify(Node<K,V> b) {
2540	>	Node<K,V> hd = null, tl = null;
2541	>	for (Node<K,V> q = b; q != null; q = q.next) {
2542	>	Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val, null);
2543	>	if (tl == null)
2544	>	hd = p;
2545	>	else
2546	>	tl.next = p;
2547	>	tl = p;
2548	>	}
2549	>	return hd;
2550	>	}
2551	>
2552	>	/* ---------------- TreeNodes -------------- */
2553	>
2554	>	/**
2555	>	* Nodes for use in TreeBins
2556	>	*/
2557	>	static final class TreeNode<K,V> extends Node<K,V> {
2558	>	TreeNode<K,V> parent;  // red-black tree links
2559	>	TreeNode<K,V> left;
2560	>	TreeNode<K,V> right;
2561	>	TreeNode<K,V> prev;    // needed to unlink next upon deletion
2562	>	boolean red;
2563	>
2564	>	TreeNode(int hash, K key, V val, Node<K,V> next,
2565	>	TreeNode<K,V> parent) {
2566	>	super(hash, key, val, next);
2567	>	this.parent = parent;
2568	>	}
2569	>
2570	>	Node<K,V> find(int h, Object k) {
2571	>	return findTreeNode(h, k, null);
2572	>	}
2573	>
2574	>	/**
2575	>	* Returns the TreeNode (or null if not found) for the given key
2576	>	* starting at given root.
2577	>	*/
2578	>	final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) {
2579	>	if (k != null) {
2580	>	TreeNode<K,V> p = this;
2581	>	do {
2582	>	int ph, dir; K pk; TreeNode<K,V> q;
2583	>	TreeNode<K,V> pl = p.left, pr = p.right;
2584	>	if ((ph = p.hash) > h)
2585	>	p = pl;
2586	>	else if (ph < h)
2587	>	p = pr;
2588	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2589	>	return p;
2590	>	else if (pl == null)
2591	>	p = pr;
2592	>	else if (pr == null)
2593	>	p = pl;
2594	>	else if ((kc != null ||
2595	>	(kc = comparableClassFor(k)) != null) &&
2596	>	(dir = compareComparables(kc, k, pk)) != 0)
2597	>	p = (dir < 0) ? pl : pr;
2598	>	else if ((q = pr.findTreeNode(h, k, kc)) != null)
2599	>	return q;
2600	>	else
2601	>	p = pl;
2602	>	} while (p != null);
2603	>	}
2604	>	return null;
2605	>	}
2606	>	}
2607	>
2608	>	/* ---------------- TreeBins -------------- */
2609	>
2610	>	/**
2611	>	* TreeNodes used at the heads of bins. TreeBins do not hold user
2612	>	* keys or values, but instead point to list of TreeNodes and
2613	>	* their root. They also maintain a parasitic read-write lock
2614	>	* forcing writers (who hold bin lock) to wait for readers (who do
2615	>	* not) to complete before tree restructuring operations.
2616	>	*/
2617	>	static final class TreeBin<K,V> extends Node<K,V> {
2618	>	TreeNode<K,V> root;
2619	>	volatile TreeNode<K,V> first;
2620	>	volatile Thread waiter;
2621	>	volatile int lockState;
2622	>	// values for lockState
2623	>	static final int WRITER = 1; // set while holding write lock
2624	>	static final int WAITER = 2; // set when waiting for write lock
2625	>	static final int READER = 4; // increment value for setting read lock
2626	>
2627	>	/**
2628	>	* Tie-breaking utility for ordering insertions when equal
2629	>	* hashCodes and non-comparable. We don't require a total
2630	>	* order, just a consistent insertion rule to maintain
2631	>	* equivalence across rebalancings. Tie-breaking further than
2632	>	* necessary simplifies testing a bit.
2633	>	*/
2634	>	static int tieBreakOrder(Object a, Object b) {
2635	>	int d;
2636	>	if (a == null || b == null ||
2637	>	(d = a.getClass().getName().
2638	>	compareTo(b.getClass().getName())) == 0)
2639	>	d = (System.identityHashCode(a) <= System.identityHashCode(b) ?
2640	>	-1 : 1);
2641	>	return d;
2642	>	}
2643	>
2644	>	/**
2645	>	* Creates bin with initial set of nodes headed by b.
2646	>	*/
2647	>	TreeBin(TreeNode<K,V> b) {
2648	>	super(TREEBIN, null, null, null);
2649	>	this.first = b;
2650	>	TreeNode<K,V> r = null;
2651	>	for (TreeNode<K,V> x = b, next; x != null; x = next) {
2652	>	next = (TreeNode<K,V>)x.next;
2653	>	x.left = x.right = null;
2654	>	if (r == null) {
2655	>	x.parent = null;
2656	>	x.red = false;
2657	>	r = x;
2658	>	}
2659	>	else {
2660	>	K k = x.key;
2661	>	int h = x.hash;
2662	>	Class<?> kc = null;
2663	>	for (TreeNode<K,V> p = r;;) {
2664	>	int dir, ph;
2665	>	K pk = p.key;
2666	>	if ((ph = p.hash) > h)
2667	>	dir = -1;
2668	>	else if (ph < h)
2669	>	dir = 1;
2670	>	else if ((kc == null &&
2671	>	(kc = comparableClassFor(k)) == null) ||
2672	>	(dir = compareComparables(kc, k, pk)) == 0)
2673	>	dir = tieBreakOrder(k, pk);
2674	>	TreeNode<K,V> xp = p;
2675	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2676	>	x.parent = xp;
2677	>	if (dir <= 0)
2678	>	xp.left = x;
2679	>	else
2680	>	xp.right = x;
2681	>	r = balanceInsertion(r, x);
2682	>	break;
2683	>	}
2684	>	}
2685	>	}
2686	>	}
2687	>	this.root = r;
2688	>	assert checkInvariants(root);
2689	>	}
2690	>
2691	>	/**
2692	>	* Acquires write lock for tree restructuring.
2693	>	*/
2694	>	private final void lockRoot() {
2695	>	if (!U.compareAndSwapInt(this, LOCKSTATE, 0, WRITER))
2696	>	contendedLock(); // offload to separate method
2697	>	}
2698	>
2699	>	/**
2700	>	* Releases write lock for tree restructuring.
2701	>	*/
2702	>	private final void unlockRoot() {
2703	>	lockState = 0;
2704	>	}
2705	>
2706	>	/**
2707	>	* Possibly blocks awaiting root lock.
2708	>	*/
2709	>	private final void contendedLock() {
2710	>	boolean waiting = false;
2711	>	for (int s;;) {
2712	>	if (((s = lockState) & ~WAITER) == 0) {
2713	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, WRITER)) {
2714	>	if (waiting)
2715	>	waiter = null;
2716	>	return;
2717	>	}
2718	>	}
2719	>	else if ((s & WAITER) == 0) {
2720	>	if (U.compareAndSwapInt(this, LOCKSTATE, s, s | WAITER)) {
2721	>	waiting = true;
2722	>	waiter = Thread.currentThread();
2723	>	}
2724	>	}
2725	>	else if (waiting)
2726	>	LockSupport.park(this);
2727	>	}
2728	>	}
2729	>
2730	>	/**
2731	>	* Returns matching node or null if none. Tries to search
2732	>	* using tree comparisons from root, but continues linear
2733	>	* search when lock not available.
2734	>	*/
2735	>	final Node<K,V> find(int h, Object k) {
2736	>	if (k != null) {
2737	>	for (Node<K,V> e = first; e != null; ) {
2738	>	int s; K ek;
2739	>	if (((s = lockState) & (WAITER|WRITER)) != 0) {
2740	>	if (e.hash == h &&
2741	>	((ek = e.key) == k || (ek != null && k.equals(ek))))
2742	>	return e;
2743	>	e = e.next;
2744	>	}
2745	>	else if (U.compareAndSwapInt(this, LOCKSTATE, s,
2746	>	s + READER)) {
2747	>	TreeNode<K,V> r, p;
2748	>	try {
2749	>	p = ((r = root) == null ? null :
2750	>	r.findTreeNode(h, k, null));
2751	>	} finally {
2752	>	Thread w;
2753	>	int ls;
2754	>	do {} while (!U.compareAndSwapInt
2755	>	(this, LOCKSTATE,
2756	>	ls = lockState, ls - READER));
2757	>	if (ls == (READER|WAITER) && (w = waiter) != null)
2758	>	LockSupport.unpark(w);
2759	>	}
2760	>	return p;
2761	>	}
2762	>	}
2763	>	}
2764	>	return null;
2765	>	}
2766	>
2767	>	/**
2768	>	* Finds or adds a node.
2769	>	* @return null if added
2770	>	*/
2771	>	final TreeNode<K,V> putTreeVal(int h, K k, V v) {
2772	>	Class<?> kc = null;
2773	>	boolean searched = false;
2774	>	for (TreeNode<K,V> p = root;;) {
2775	>	int dir, ph; K pk;
2776	>	if (p == null) {
2777	>	first = root = new TreeNode<K,V>(h, k, v, null, null);
2778	>	break;
2779	>	}
2780	>	else if ((ph = p.hash) > h)
2781	>	dir = -1;
2782	>	else if (ph < h)
2783	>	dir = 1;
2784	>	else if ((pk = p.key) == k || (pk != null && k.equals(pk)))
2785	>	return p;
2786	>	else if ((kc == null &&
2787	>	(kc = comparableClassFor(k)) == null) ||
2788	>	(dir = compareComparables(kc, k, pk)) == 0) {
2789	>	if (!searched) {
2790	>	TreeNode<K,V> q, ch;
2791	>	searched = true;
2792	>	if (((ch = p.left) != null &&
2793	>	(q = ch.findTreeNode(h, k, kc)) != null) ||
2794	>	((ch = p.right) != null &&
2795	>	(q = ch.findTreeNode(h, k, kc)) != null))
2796	>	return q;
2797	>	}
2798	>	dir = tieBreakOrder(k, pk);
2799	>	}
2800	>
2801	>	TreeNode<K,V> xp = p;
2802	>	if ((p = (dir <= 0) ? p.left : p.right) == null) {
2803	>	TreeNode<K,V> x, f = first;
2804	>	first = x = new TreeNode<K,V>(h, k, v, f, xp);
2805	>	if (f != null)
2806	>	f.prev = x;
2807	>	if (dir <= 0)
2808	>	xp.left = x;
2809	>	else
2810	>	xp.right = x;
2811	>	if (!xp.red)
2812	>	x.red = true;
2813	>	else {
2814	>	lockRoot();
2815	>	try {
2816	>	root = balanceInsertion(root, x);
2817	>	} finally {
2818	>	unlockRoot();
2819	>	}
2820	>	}
2821	>	break;
2822	>	}
2823	>	}
2824	>	assert checkInvariants(root);
2825	>	return null;
2826	>	}
2827	>
2828	>	/**
2829	>	* Removes the given node, that must be present before this
2830	>	* call.  This is messier than typical red-black deletion code
2831	>	* because we cannot swap the contents of an interior node
2832	>	* with a leaf successor that is pinned by "next" pointers
2833	>	* that are accessible independently of lock. So instead we
2834	>	* swap the tree linkages.
2835	>	*
2836	>	* @return true if now too small, so should be untreeified
2837	>	*/
2838	>	final boolean removeTreeNode(TreeNode<K,V> p) {
2839	>	TreeNode<K,V> next = (TreeNode<K,V>)p.next;
2840	>	TreeNode<K,V> pred = p.prev;  // unlink traversal pointers
2841	>	TreeNode<K,V> r, rl;
2842	>	if (pred == null)
2843	>	first = next;
2844	>	else
2845	>	pred.next = next;
2846	>	if (next != null)
2847	>	next.prev = pred;
2848	>	if (first == null) {
2849	>	root = null;
2850	>	return true;
2851	>	}
2852	>	if ((r = root) == null || r.right == null || // too small
2853	>	(rl = r.left) == null || rl.left == null)
2854	>	return true;
2855	>	lockRoot();
2856	>	try {
2857	>	TreeNode<K,V> replacement;
2858	>	TreeNode<K,V> pl = p.left;
2859	>	TreeNode<K,V> pr = p.right;
2860	>	if (pl != null && pr != null) {
2861	>	TreeNode<K,V> s = pr, sl;
2862	>	while ((sl = s.left) != null) // find successor
2863	>	s = sl;
2864	>	boolean c = s.red; s.red = p.red; p.red = c; // swap colors
2865	>	TreeNode<K,V> sr = s.right;
2866	>	TreeNode<K,V> pp = p.parent;
2867	>	if (s == pr) { // p was s's direct parent
2868	>	p.parent = s;
2869	>	s.right = p;
2870	>	}
2871	>	else {
2872	>	TreeNode<K,V> sp = s.parent;
2873	>	if ((p.parent = sp) != null) {
2874	>	if (s == sp.left)
2875	>	sp.left = p;
2876	>	else
2877	>	sp.right = p;
2878	>	}
2879	>	if ((s.right = pr) != null)
2880	>	pr.parent = s;
2881	>	}
2882	>	p.left = null;
2883	>	if ((p.right = sr) != null)
2884	>	sr.parent = p;
2885	>	if ((s.left = pl) != null)
2886	>	pl.parent = s;
2887	>	if ((s.parent = pp) == null)
2888	>	r = s;
2889	>	else if (p == pp.left)
2890	>	pp.left = s;
2891	>	else
2892	>	pp.right = s;
2893	>	if (sr != null)
2894	>	replacement = sr;
2895	>	else
2896	>	replacement = p;
2897	>	}
2898	>	else if (pl != null)
2899	>	replacement = pl;
2900	>	else if (pr != null)
2901	>	replacement = pr;
2902	>	else
2903	>	replacement = p;
2904	>	if (replacement != p) {
2905	>	TreeNode<K,V> pp = replacement.parent = p.parent;
2906	>	if (pp == null)
2907	>	r = replacement;
2908	>	else if (p == pp.left)
2909	>	pp.left = replacement;
2910	>	else
2911	>	pp.right = replacement;
2912	>	p.left = p.right = p.parent = null;
2913	>	}
2914	>
2915	>	root = (p.red) ? r : balanceDeletion(r, replacement);
2916	>
2917	>	if (p == replacement) {  // detach pointers
2918	>	TreeNode<K,V> pp;
2919	>	if ((pp = p.parent) != null) {
2920	>	if (p == pp.left)
2921	>	pp.left = null;
2922	>	else if (p == pp.right)
2923	>	pp.right = null;
2924	>	p.parent = null;
2925	>	}
2926	>	}
2927	>	} finally {
2928	>	unlockRoot();
2929	>	}
2930	>	assert checkInvariants(root);
2931	>	return false;
2932	>	}
2933	>
2934	>	/* ------------------------------------------------------------ */
2935	>	// Red-black tree methods, all adapted from CLR
2936	>
2937	>	static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root,
2938	>	TreeNode<K,V> p) {
2939	>	TreeNode<K,V> r, pp, rl;
2940	>	if (p != null && (r = p.right) != null) {
2941	>	if ((rl = p.right = r.left) != null)
2942	>	rl.parent = p;
2943	>	if ((pp = r.parent = p.parent) == null)
2944	>	(root = r).red = false;
2945	>	else if (pp.left == p)
2946	>	pp.left = r;
2947	>	else
2948	>	pp.right = r;
2949	>	r.left = p;
2950	>	p.parent = r;
2951	>	}
2952	>	return root;
2953	>	}
2954	>
2955	>	static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root,
2956	>	TreeNode<K,V> p) {
2957	>	TreeNode<K,V> l, pp, lr;
2958	>	if (p != null && (l = p.left) != null) {
2959	>	if ((lr = p.left = l.right) != null)
2960	>	lr.parent = p;
2961	>	if ((pp = l.parent = p.parent) == null)
2962	>	(root = l).red = false;
2963	>	else if (pp.right == p)
2964	>	pp.right = l;
2965	>	else
2966	>	pp.left = l;
2967	>	l.right = p;
2968	>	p.parent = l;
2969	>	}
2970	>	return root;
2971	>	}
2972	>
2973	>	static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root,
2974	>	TreeNode<K,V> x) {
2975	>	x.red = true;
2976	>	for (TreeNode<K,V> xp, xpp, xppl, xppr;;) {
2977	>	if ((xp = x.parent) == null) {
2978	>	x.red = false;
2979	>	return x;
2980	>	}
2981	>	else if (!xp.red || (xpp = xp.parent) == null)
2982	>	return root;
2983	>	if (xp == (xppl = xpp.left)) {
2984	>	if ((xppr = xpp.right) != null && xppr.red) {
2985	>	xppr.red = false;
2986	>	xp.red = false;
2987	>	xpp.red = true;
2988	>	x = xpp;
2989	>	}
2990	>	else {
2991	>	if (x == xp.right) {
2992	>	root = rotateLeft(root, x = xp);
2993	>	xpp = (xp = x.parent) == null ? null : xp.parent;
2994	>	}
2995	>	if (xp != null) {
2996	>	xp.red = false;
2997	>	if (xpp != null) {
2998	>	xpp.red = true;
2999	>	root = rotateRight(root, xpp);
3000	>	}
3001	>	}
3002	>	}
3003	>	}
3004	>	else {
3005	>	if (xppl != null && xppl.red) {
3006	>	xppl.red = false;
3007	>	xp.red = false;
3008	>	xpp.red = true;
3009	>	x = xpp;
3010	>	}
3011	>	else {
3012	>	if (x == xp.left) {
3013	>	root = rotateRight(root, x = xp);
3014	>	xpp = (xp = x.parent) == null ? null : xp.parent;
3015	>	}
3016	>	if (xp != null) {
3017	>	xp.red = false;
3018	>	if (xpp != null) {
3019	>	xpp.red = true;
3020	>	root = rotateLeft(root, xpp);
3021	>	}
3022	>	}
3023	>	}
3024	>	}
3025	>	}
3026	>	}
3027	>
3028	>	static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root,
3029	>	TreeNode<K,V> x) {
3030	>	for (TreeNode<K,V> xp, xpl, xpr;;) {
3031	>	if (x == null || x == root)
3032	>	return root;
3033	>	else if ((xp = x.parent) == null) {
3034	>	x.red = false;
3035	>	return x;
3036	>	}
3037	>	else if (x.red) {
3038	>	x.red = false;
3039	>	return root;
3040	>	}
3041	>	else if ((xpl = xp.left) == x) {
3042	>	if ((xpr = xp.right) != null && xpr.red) {
3043	>	xpr.red = false;
3044	>	xp.red = true;
3045	>	root = rotateLeft(root, xp);
3046	>	xpr = (xp = x.parent) == null ? null : xp.right;
3047	>	}
3048	>	if (xpr == null)
3049	>	x = xp;
3050	>	else {
3051	>	TreeNode<K,V> sl = xpr.left, sr = xpr.right;
3052	>	if ((sr == null || !sr.red) &&
3053	>	(sl == null || !sl.red)) {
3054	>	xpr.red = true;
3055	>	x = xp;
3056	>	}
3057	>	else {
3058	>	if (sr == null || !sr.red) {
3059	>	if (sl != null)
3060	>	sl.red = false;
3061	>	xpr.red = true;
3062	>	root = rotateRight(root, xpr);
3063	>	xpr = (xp = x.parent) == null ?
3064	>	null : xp.right;
3065	>	}
3066	>	if (xpr != null) {
3067	>	xpr.red = (xp == null) ? false : xp.red;
3068	>	if ((sr = xpr.right) != null)
3069	>	sr.red = false;
3070	>	}
3071	>	if (xp != null) {
3072	>	xp.red = false;
3073	>	root = rotateLeft(root, xp);
3074	>	}
3075	>	x = root;
3076	>	}
3077	>	}
3078	>	}
3079	>	else { // symmetric
3080	>	if (xpl != null && xpl.red) {
3081	>	xpl.red = false;
3082	>	xp.red = true;
3083	>	root = rotateRight(root, xp);
3084	>	xpl = (xp = x.parent) == null ? null : xp.left;
3085	>	}
3086	>	if (xpl == null)
3087	>	x = xp;
3088	>	else {
3089	>	TreeNode<K,V> sl = xpl.left, sr = xpl.right;
3090	>	if ((sl == null || !sl.red) &&
3091	>	(sr == null || !sr.red)) {
3092	>	xpl.red = true;
3093	>	x = xp;
3094	>	}
3095	>	else {
3096	>	if (sl == null || !sl.red) {
3097	>	if (sr != null)
3098	>	sr.red = false;
3099	>	xpl.red = true;
3100	>	root = rotateLeft(root, xpl);
3101	>	xpl = (xp = x.parent) == null ?
3102	>	null : xp.left;
3103	>	}
3104	>	if (xpl != null) {
3105	>	xpl.red = (xp == null) ? false : xp.red;
3106	>	if ((sl = xpl.left) != null)
3107	>	sl.red = false;
3108	>	}
3109	>	if (xp != null) {
3110	>	xp.red = false;
3111	>	root = rotateRight(root, xp);
3112	>	}
3113	>	x = root;
3114	>	}
3115	>	}
3116	>	}
3117	>	}
3118	>	}
3119	>
3120	>	/**
3121	>	* Recursive invariant check
3122	>	*/
3123	>	static <K,V> boolean checkInvariants(TreeNode<K,V> t) {
3124	>	TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right,
3125	>	tb = t.prev, tn = (TreeNode<K,V>)t.next;
3126	>	if (tb != null && tb.next != t)
3127	>	return false;
3128	>	if (tn != null && tn.prev != t)
3129	>	return false;
3130	>	if (tp != null && t != tp.left && t != tp.right)
3131	>	return false;
3132	>	if (tl != null && (tl.parent != t || tl.hash > t.hash))
3133	>	return false;
3134	>	if (tr != null && (tr.parent != t || tr.hash < t.hash))
3135	>	return false;
3136	>	if (t.red && tl != null && tl.red && tr != null && tr.red)
3137	>	return false;
3138	>	if (tl != null && !checkInvariants(tl))
3139	>	return false;
3140	>	if (tr != null && !checkInvariants(tr))
3141	>	return false;
3142	>	return true;
3143	>	}
3144	>
3145	>	private static final sun.misc.Unsafe U;
3146	>	private static final long LOCKSTATE;
3147	>	static {
3148	>	try {
3149	>	U = getUnsafe();
3150	>	Class<?> k = TreeBin.class;
3151	>	LOCKSTATE = U.objectFieldOffset
3152	>	(k.getDeclaredField("lockState"));
3153	>	} catch (Exception e) {
3154	>	throw new Error(e);
3155	>	}
3156	>	}
3157	>	}
3158	>
3159	>	/* ----------------Table Traversal -------------- */
3160	>
3161	>	/**
3162	>	* Records the table, its length, and current traversal index for a
3163	>	* traverser that must process a region of a forwarded table before
3164	>	* proceeding with current table.
3165	>	*/
3166	>	static final class TableStack<K,V> {
3167	>	int length;
3168	>	int index;
3169	>	Node<K,V>[] tab;
3170	>	TableStack<K,V> next;
3171	>	}
3172	>
3173	>	/**
3174	>	* Encapsulates traversal for methods such as containsValue; also
3175	>	* serves as a base class for other iterators and spliterators.
3176	>	*
3177	>	* Method advance visits once each still-valid node that was
3178	>	* reachable upon iterator construction. It might miss some that
3179	>	* were added to a bin after the bin was visited, which is OK wrt
3180	>	* consistency guarantees. Maintaining this property in the face
3181	>	* of possible ongoing resizes requires a fair amount of
3182	>	* bookkeeping state that is difficult to optimize away amidst
3183	>	* volatile accesses.  Even so, traversal maintains reasonable
3184	>	* throughput.
3185	>	*
3186	>	* Normally, iteration proceeds bin-by-bin traversing lists.
3187	>	* However, if the table has been resized, then all future steps
3188	>	* must traverse both the bin at the current index as well as at
3189	>	* (index + baseSize); and so on for further resizings. To
3190	>	* paranoically cope with potential sharing by users of iterators
3191	>	* across threads, iteration terminates if a bounds checks fails
3192	>	* for a table read.
3193	>	*/
3194	>	static class Traverser<K,V> {
3195	>	Node<K,V>[] tab;        // current table; updated if resized
3196	>	Node<K,V> next;         // the next entry to use
3197	>	TableStack<K,V> stack, spare; // to save/restore on ForwardingNodes
3198	>	int index;              // index of bin to use next
3199	>	int baseIndex;          // current index of initial table
3200	>	int baseLimit;          // index bound for initial table
3201	>	final int baseSize;     // initial table size
3202	>
3203	>	Traverser(Node<K,V>[] tab, int size, int index, int limit) {
3204	>	this.tab = tab;
3205	>	this.baseSize = size;
3206	>	this.baseIndex = this.index = index;
3207	>	this.baseLimit = limit;
3208	>	this.next = null;
3209	>	}
3210	>
3211	>	/**
3212	>	* Advances if possible, returning next valid node, or null if none.
3213	>	*/
3214	>	final Node<K,V> advance() {
3215	>	Node<K,V> e;
3216	>	if ((e = next) != null)
3217	>	e = e.next;
3218	>	for (;;) {
3219	>	Node<K,V>[] t; int i, n;  // must use locals in checks
3220	>	if (e != null)
3221	>	return next = e;
3222	>	if (baseIndex >= baseLimit || (t = tab) == null ||
3223	>	(n = t.length) <= (i = index) || i < 0)
3224	>	return next = null;
3225	>	if ((e = tabAt(t, i)) != null && e.hash < 0) {
3226	>	if (e instanceof ForwardingNode) {
3227	>	tab = ((ForwardingNode<K,V>)e).nextTable;
3228	>	e = null;
3229	>	pushState(t, i, n);
3230	>	continue;
3231	>	}
3232	>	else if (e instanceof TreeBin)
3233	>	e = ((TreeBin<K,V>)e).first;
3234	>	else
3235	>	e = null;
3236	>	}
3237	>	if (stack != null)
3238	>	recoverState(n);
3239	>	else if ((index = i + baseSize) >= n)
3240	>	index = ++baseIndex; // visit upper slots if present
3241	>	}
3242	>	}
3243	>
3244	>	/**
3245	>	* Saves traversal state upon encountering a forwarding node.
3246	>	*/
3247	>	private void pushState(Node<K,V>[] t, int i, int n) {
3248	>	TableStack<K,V> s = spare;  // reuse if possible
3249	>	if (s != null)
3250	>	spare = s.next;
3251	>	else
3252	>	s = new TableStack<K,V>();
3253	>	s.tab = t;
3254	>	s.length = n;
3255	>	s.index = i;
3256	>	s.next = stack;
3257	>	stack = s;
3258	>	}
3259	>
3260	>	/**
3261	>	* Possibly pops traversal state.
3262	>	*
3263	>	* @param n length of current table
3264	>	*/
3265	>	private void recoverState(int n) {
3266	>	TableStack<K,V> s; int len;
3267	>	while ((s = stack) != null && (index += (len = s.length)) >= n) {
3268	>	n = len;
3269	>	index = s.index;
3270	>	tab = s.tab;
3271	>	s.tab = null;
3272	>	TableStack<K,V> next = s.next;
3273	>	s.next = spare; // save for reuse
3274	>	stack = next;
3275	>	spare = s;
3276	>	}
3277	>	if (s == null && (index += baseSize) >= n)
3278	>	index = ++baseIndex;
3279	>	}
3280	>	}
3281	>
3282	>	/**
3283	>	* Base of key, value, and entry Iterators. Adds fields to
3284	>	* Traverser to support iterator.remove.
3285	>	*/
3286	>	static class BaseIterator<K,V> extends Traverser<K,V> {
3287	>	final ConcurrentHashMapV8<K,V> map;
3288	>	Node<K,V> lastReturned;
3289	>	BaseIterator(Node<K,V>[] tab, int size, int index, int limit,
3290	>	ConcurrentHashMapV8<K,V> map) {
3291	>	super(tab, size, index, limit);
3292	>	this.map = map;
3293	>	advance();
3294		}
3295
3296	<	public ValueIterator<K,V> clone() {
3297	<	if (last != null || (next != null && nextVal == null))
3296	>	public final boolean hasNext() { return next != null; }
3297	>	public final boolean hasMoreElements() { return next != null; }
3298	>
3299	>	public final void remove() {
3300	>	Node<K,V> p;
3301	>	if ((p = lastReturned) == null)
3302		throw new IllegalStateException();
3303	<	return new ValueIterator<K,V>(this, false);
3303	>	lastReturned = null;
3304	>	map.replaceNode(p.key, null, null);
3305		}
3306	+	}
3307
3308	<	@SuppressWarnings("unchecked")
3309	<	public final V next() {
3310	<	Object v;
3311	<	if ((v = nextVal) == null && (v = advance()) == null)
3308	>	static final class KeyIterator<K,V> extends BaseIterator<K,V>
3309	>	implements Iterator<K>, Enumeration<K> {
3310	>	KeyIterator(Node<K,V>[] tab, int index, int size, int limit,
3311	>	ConcurrentHashMapV8<K,V> map) {
3312	>	super(tab, index, size, limit, map);
3313	>	}
3314	>
3315	>	public final K next() {
3316	>	Node<K,V> p;
3317	>	if ((p = next) == null)
3318		throw new NoSuchElementException();
3319	<	nextVal = null;
3320	<	return (V) v;
3319	>	K k = p.key;
3320	>	lastReturned = p;
3321	>	advance();
3322	>	return k;
3323		}
3324
3325	<	public final V nextElement() { return next(); }
3325	>	public final K nextElement() { return next(); }
3326		}
3327
3328	<	static final class EntryIterator<K,V> extends InternalIterator<K,V>
3329	<	implements Spliterator<Map.Entry<K,V>> {
3330	<	EntryIterator(ConcurrentHashMapV8<K, V> map) { super(map); }
3331	<	EntryIterator(InternalIterator<K,V> it, boolean split) {
3332	<	super(it, split);
3328	>	static final class ValueIterator<K,V> extends BaseIterator<K,V>
3329	>	implements Iterator<V>, Enumeration<V> {
3330	>	ValueIterator(Node<K,V>[] tab, int index, int size, int limit,
3331	>	ConcurrentHashMapV8<K,V> map) {
3332	>	super(tab, index, size, limit, map);
3333		}
3334	<	public EntryIterator<K,V> split() {
3335	<	if (last != null || (next != null && nextVal == null))
3336	<	throw new IllegalStateException();
3337	<	return new EntryIterator<K,V>(this, true);
3334	>
3335	>	public final V next() {
3336	>	Node<K,V> p;
3337	>	if ((p = next) == null)
3338	>	throw new NoSuchElementException();
3339	>	V v = p.val;
3340	>	lastReturned = p;
3341	>	advance();
3342	>	return v;
3343		}
3344	<	public EntryIterator<K,V> clone() {
3345	<	if (last != null || (next != null && nextVal == null))
3346	<	throw new IllegalStateException();
3347	<	return new EntryIterator<K,V>(this, false);
3344	>
3345	>	public final V nextElement() { return next(); }
3346	>	}
3347	>
3348	>	static final class EntryIterator<K,V> extends BaseIterator<K,V>
3349	>	implements Iterator<Map.Entry<K,V>> {
3350	>	EntryIterator(Node<K,V>[] tab, int index, int size, int limit,
3351	>	ConcurrentHashMapV8<K,V> map) {
3352	>	super(tab, index, size, limit, map);
3353		}
3354
2916	–	@SuppressWarnings("unchecked")
3355		public final Map.Entry<K,V> next() {
3356	<	Object v;
3357	<	if ((v = nextVal) == null && (v = advance()) == null)
3356	>	Node<K,V> p;
3357	>	if ((p = next) == null)
3358		throw new NoSuchElementException();
3359	<	Object k = nextKey;
3360	<	nextVal = null;
3361	<	return new MapEntry<K,V>((K)k, (V)v, map);
3359	>	K k = p.key;
3360	>	V v = p.val;
3361	>	lastReturned = p;
3362	>	advance();
3363	>	return new MapEntry<K,V>(k, v, map);
3364		}
3365		}
3366
3367		/**
3368	<	* Exported Entry for iterators
3368	>	* Exported Entry for EntryIterator
3369		*/
3370	<	static final class MapEntry<K,V> implements Map.Entry<K, V> {
3370	>	static final class MapEntry<K,V> implements Map.Entry<K,V> {
3371		final K key; // non-null
3372		V val;       // non-null
3373	<	final ConcurrentHashMapV8<K, V> map;
3374	<	MapEntry(K key, V val, ConcurrentHashMapV8<K, V> map) {
3373	>	final ConcurrentHashMapV8<K,V> map;
3374	>	MapEntry(K key, V val, ConcurrentHashMapV8<K,V> map) {
3375		this.key = key;
3376		this.val = val;
3377		this.map = map;
3378		}
3379	<	public final K getKey()       { return key; }
3380	<	public final V getValue()     { return val; }
3381	<	public final int hashCode()   { return key.hashCode() ^ val.hashCode(); }
3382	<	public final String toString(){ return key + "=" + val; }
3379	>	public K getKey()        { return key; }
3380	>	public V getValue()      { return val; }
3381	>	public int hashCode()    { return key.hashCode() ^ val.hashCode(); }
3382	>	public String toString() { return key + "=" + val; }
3383
3384	<	public final boolean equals(Object o) {
3384	>	public boolean equals(Object o) {
3385		Object k, v; Map.Entry<?,?> e;
3386		return ((o instanceof Map.Entry) &&
3387		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 2952 | Line 3392 | public class ConcurrentHashMapV8<K, V>
3392
3393		/**
3394		* Sets our entry's value and writes through to the map. The
3395	<	* value to return is somewhat arbitrary here. Since a we do
3396	<	* not necessarily track asynchronous changes, the most recent
3395	>	* value to return is somewhat arbitrary here. Since we do not
3396	>	* necessarily track asynchronous changes, the most recent
3397		* "previous" value could be different from what we return (or
3398	<	* could even have been removed in which case the put will
3398	>	* could even have been removed, in which case the put will
3399		* re-establish). We do not and cannot guarantee more.
3400		*/
3401	<	public final V setValue(V value) {
3401	>	public V setValue(V value) {
3402		if (value == null) throw new NullPointerException();
3403		V v = val;
3404		val = value;
#	Line 2967 | Line 3407 | public class ConcurrentHashMapV8<K, V>
3407		}
3408		}
3409
3410	+	static final class KeySpliterator<K,V> extends Traverser<K,V>
3411	+	implements ConcurrentHashMapSpliterator<K> {
3412	+	long est;               // size estimate
3413	+	KeySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3414	+	long est) {
3415	+	super(tab, size, index, limit);
3416	+	this.est = est;
3417	+	}
3418	+
3419	+	public ConcurrentHashMapSpliterator<K> trySplit() {
3420	+	int i, f, h;
3421	+	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3422	+	new KeySpliterator<K,V>(tab, baseSize, baseLimit = h,
3423	+	f, est >>>= 1);
3424	+	}
3425	+
3426	+	public void forEachRemaining(Action<? super K> action) {
3427	+	if (action == null) throw new NullPointerException();
3428	+	for (Node<K,V> p; (p = advance()) != null;)
3429	+	action.apply(p.key);
3430	+	}
3431	+
3432	+	public boolean tryAdvance(Action<? super K> action) {
3433	+	if (action == null) throw new NullPointerException();
3434	+	Node<K,V> p;
3435	+	if ((p = advance()) == null)
3436	+	return false;
3437	+	action.apply(p.key);
3438	+	return true;
3439	+	}
3440	+
3441	+	public long estimateSize() { return est; }
3442	+
3443	+	}
3444	+
3445	+	static final class ValueSpliterator<K,V> extends Traverser<K,V>
3446	+	implements ConcurrentHashMapSpliterator<V> {
3447	+	long est;               // size estimate
3448	+	ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit,
3449	+	long est) {
3450	+	super(tab, size, index, limit);
3451	+	this.est = est;
3452	+	}
3453	+
3454	+	public ConcurrentHashMapSpliterator<V> trySplit() {
3455	+	int i, f, h;
3456	+	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3457	+	new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h,
3458	+	f, est >>>= 1);
3459	+	}
3460	+
3461	+	public void forEachRemaining(Action<? super V> action) {
3462	+	if (action == null) throw new NullPointerException();
3463	+	for (Node<K,V> p; (p = advance()) != null;)
3464	+	action.apply(p.val);
3465	+	}
3466	+
3467	+	public boolean tryAdvance(Action<? super V> action) {
3468	+	if (action == null) throw new NullPointerException();
3469	+	Node<K,V> p;
3470	+	if ((p = advance()) == null)
3471	+	return false;
3472	+	action.apply(p.val);
3473	+	return true;
3474	+	}
3475	+
3476	+	public long estimateSize() { return est; }
3477	+
3478	+	}
3479	+
3480	+	static final class EntrySpliterator<K,V> extends Traverser<K,V>
3481	+	implements ConcurrentHashMapSpliterator<Map.Entry<K,V>> {
3482	+	final ConcurrentHashMapV8<K,V> map; // To export MapEntry
3483	+	long est;               // size estimate
3484	+	EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit,
3485	+	long est, ConcurrentHashMapV8<K,V> map) {
3486	+	super(tab, size, index, limit);
3487	+	this.map = map;
3488	+	this.est = est;
3489	+	}
3490	+
3491	+	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> trySplit() {
3492	+	int i, f, h;
3493	+	return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null :
3494	+	new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h,
3495	+	f, est >>>= 1, map);
3496	+	}
3497	+
3498	+	public void forEachRemaining(Action<? super Map.Entry<K,V>> action) {
3499	+	if (action == null) throw new NullPointerException();
3500	+	for (Node<K,V> p; (p = advance()) != null; )
3501	+	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3502	+	}
3503	+
3504	+	public boolean tryAdvance(Action<? super Map.Entry<K,V>> action) {
3505	+	if (action == null) throw new NullPointerException();
3506	+	Node<K,V> p;
3507	+	if ((p = advance()) == null)
3508	+	return false;
3509	+	action.apply(new MapEntry<K,V>(p.key, p.val, map));
3510	+	return true;
3511	+	}
3512	+
3513	+	public long estimateSize() { return est; }
3514	+
3515	+	}
3516	+
3517	+	// Parallel bulk operations
3518	+
3519	+	/**
3520	+	* Computes initial batch value for bulk tasks. The returned value
3521	+	* is approximately exp2 of the number of times (minus one) to
3522	+	* split task by two before executing leaf action. This value is
3523	+	* faster to compute and more convenient to use as a guide to
3524	+	* splitting than is the depth, since it is used while dividing by
3525	+	* two anyway.
3526	+	*/
3527	+	final int batchFor(long b) {
3528	+	long n;
3529	+	if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b)
3530	+	return 0;
3531	+	int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4
3532	+	return (b <= 0L || (n /= b) >= sp) ? sp : (int)n;
3533	+	}
3534	+
3535	+	/**
3536	+	* Performs the given action for each (key, value).
3537	+	*
3538	+	* @param parallelismThreshold the (estimated) number of elements
3539	+	* needed for this operation to be executed in parallel
3540	+	* @param action the action
3541	+	* @since 1.8
3542	+	*/
3543	+	public void forEach(long parallelismThreshold,
3544	+	BiAction<? super K,? super V> action) {
3545	+	if (action == null) throw new NullPointerException();
3546	+	new ForEachMappingTask<K,V>
3547	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3548	+	action).invoke();
3549	+	}
3550	+
3551	+	/**
3552	+	* Performs the given action for each non-null transformation
3553	+	* of each (key, value).
3554	+	*
3555	+	* @param parallelismThreshold the (estimated) number of elements
3556	+	* needed for this operation to be executed in parallel
3557	+	* @param transformer a function returning the transformation
3558	+	* for an element, or null if there is no transformation (in
3559	+	* which case the action is not applied)
3560	+	* @param action the action
3561	+	* @since 1.8
3562	+	*/
3563	+	public <U> void forEach(long parallelismThreshold,
3564	+	BiFun<? super K, ? super V, ? extends U> transformer,
3565	+	Action<? super U> action) {
3566	+	if (transformer == null || action == null)
3567	+	throw new NullPointerException();
3568	+	new ForEachTransformedMappingTask<K,V,U>
3569	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3570	+	transformer, action).invoke();
3571	+	}
3572	+
3573	+	/**
3574	+	* Returns a non-null result from applying the given search
3575	+	* function on each (key, value), or null if none.  Upon
3576	+	* success, further element processing is suppressed and the
3577	+	* results of any other parallel invocations of the search
3578	+	* function are ignored.
3579	+	*
3580	+	* @param parallelismThreshold the (estimated) number of elements
3581	+	* needed for this operation to be executed in parallel
3582	+	* @param searchFunction a function returning a non-null
3583	+	* result on success, else null
3584	+	* @return a non-null result from applying the given search
3585	+	* function on each (key, value), or null if none
3586	+	* @since 1.8
3587	+	*/
3588	+	public <U> U search(long parallelismThreshold,
3589	+	BiFun<? super K, ? super V, ? extends U> searchFunction) {
3590	+	if (searchFunction == null) throw new NullPointerException();
3591	+	return new SearchMappingsTask<K,V,U>
3592	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3593	+	searchFunction, new AtomicReference<U>()).invoke();
3594	+	}
3595	+
3596	+	/**
3597	+	* Returns the result of accumulating the given transformation
3598	+	* of all (key, value) pairs using the given reducer to
3599	+	* combine values, or null if none.
3600	+	*
3601	+	* @param parallelismThreshold the (estimated) number of elements
3602	+	* needed for this operation to be executed in parallel
3603	+	* @param transformer a function returning the transformation
3604	+	* for an element, or null if there is no transformation (in
3605	+	* which case it is not combined)
3606	+	* @param reducer a commutative associative combining function
3607	+	* @return the result of accumulating the given transformation
3608	+	* of all (key, value) pairs
3609	+	* @since 1.8
3610	+	*/
3611	+	public <U> U reduce(long parallelismThreshold,
3612	+	BiFun<? super K, ? super V, ? extends U> transformer,
3613	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3614	+	if (transformer == null || reducer == null)
3615	+	throw new NullPointerException();
3616	+	return new MapReduceMappingsTask<K,V,U>
3617	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3618	+	null, transformer, reducer).invoke();
3619	+	}
3620	+
3621	+	/**
3622	+	* Returns the result of accumulating the given transformation
3623	+	* of all (key, value) pairs using the given reducer to
3624	+	* combine values, and the given basis as an identity value.
3625	+	*
3626	+	* @param parallelismThreshold the (estimated) number of elements
3627	+	* needed for this operation to be executed in parallel
3628	+	* @param transformer a function returning the transformation
3629	+	* for an element
3630	+	* @param basis the identity (initial default value) for the reduction
3631	+	* @param reducer a commutative associative combining function
3632	+	* @return the result of accumulating the given transformation
3633	+	* of all (key, value) pairs
3634	+	* @since 1.8
3635	+	*/
3636	+	public double reduceToDouble(long parallelismThreshold,
3637	+	ObjectByObjectToDouble<? super K, ? super V> transformer,
3638	+	double basis,
3639	+	DoubleByDoubleToDouble reducer) {
3640	+	if (transformer == null || reducer == null)
3641	+	throw new NullPointerException();
3642	+	return new MapReduceMappingsToDoubleTask<K,V>
3643	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3644	+	null, transformer, basis, reducer).invoke();
3645	+	}
3646	+
3647	+	/**
3648	+	* Returns the result of accumulating the given transformation
3649	+	* of all (key, value) pairs using the given reducer to
3650	+	* combine values, and the given basis as an identity value.
3651	+	*
3652	+	* @param parallelismThreshold the (estimated) number of elements
3653	+	* needed for this operation to be executed in parallel
3654	+	* @param transformer a function returning the transformation
3655	+	* for an element
3656	+	* @param basis the identity (initial default value) for the reduction
3657	+	* @param reducer a commutative associative combining function
3658	+	* @return the result of accumulating the given transformation
3659	+	* of all (key, value) pairs
3660	+	* @since 1.8
3661	+	*/
3662	+	public long reduceToLong(long parallelismThreshold,
3663	+	ObjectByObjectToLong<? super K, ? super V> transformer,
3664	+	long basis,
3665	+	LongByLongToLong reducer) {
3666	+	if (transformer == null || reducer == null)
3667	+	throw new NullPointerException();
3668	+	return new MapReduceMappingsToLongTask<K,V>
3669	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3670	+	null, transformer, basis, reducer).invoke();
3671	+	}
3672	+
3673	+	/**
3674	+	* Returns the result of accumulating the given transformation
3675	+	* of all (key, value) pairs using the given reducer to
3676	+	* combine values, and the given basis as an identity value.
3677	+	*
3678	+	* @param parallelismThreshold the (estimated) number of elements
3679	+	* needed for this operation to be executed in parallel
3680	+	* @param transformer a function returning the transformation
3681	+	* for an element
3682	+	* @param basis the identity (initial default value) for the reduction
3683	+	* @param reducer a commutative associative combining function
3684	+	* @return the result of accumulating the given transformation
3685	+	* of all (key, value) pairs
3686	+	* @since 1.8
3687	+	*/
3688	+	public int reduceToInt(long parallelismThreshold,
3689	+	ObjectByObjectToInt<? super K, ? super V> transformer,
3690	+	int basis,
3691	+	IntByIntToInt reducer) {
3692	+	if (transformer == null || reducer == null)
3693	+	throw new NullPointerException();
3694	+	return new MapReduceMappingsToIntTask<K,V>
3695	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3696	+	null, transformer, basis, reducer).invoke();
3697	+	}
3698	+
3699	+	/**
3700	+	* Performs the given action for each key.
3701	+	*
3702	+	* @param parallelismThreshold the (estimated) number of elements
3703	+	* needed for this operation to be executed in parallel
3704	+	* @param action the action
3705	+	* @since 1.8
3706	+	*/
3707	+	public void forEachKey(long parallelismThreshold,
3708	+	Action<? super K> action) {
3709	+	if (action == null) throw new NullPointerException();
3710	+	new ForEachKeyTask<K,V>
3711	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3712	+	action).invoke();
3713	+	}
3714	+
3715	+	/**
3716	+	* Performs the given action for each non-null transformation
3717	+	* of each key.
3718	+	*
3719	+	* @param parallelismThreshold the (estimated) number of elements
3720	+	* needed for this operation to be executed in parallel
3721	+	* @param transformer a function returning the transformation
3722	+	* for an element, or null if there is no transformation (in
3723	+	* which case the action is not applied)
3724	+	* @param action the action
3725	+	* @since 1.8
3726	+	*/
3727	+	public <U> void forEachKey(long parallelismThreshold,
3728	+	Fun<? super K, ? extends U> transformer,
3729	+	Action<? super U> action) {
3730	+	if (transformer == null || action == null)
3731	+	throw new NullPointerException();
3732	+	new ForEachTransformedKeyTask<K,V,U>
3733	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3734	+	transformer, action).invoke();
3735	+	}
3736	+
3737	+	/**
3738	+	* Returns a non-null result from applying the given search
3739	+	* function on each key, or null if none. Upon success,
3740	+	* further element processing is suppressed and the results of
3741	+	* any other parallel invocations of the search function are
3742	+	* ignored.
3743	+	*
3744	+	* @param parallelismThreshold the (estimated) number of elements
3745	+	* needed for this operation to be executed in parallel
3746	+	* @param searchFunction a function returning a non-null
3747	+	* result on success, else null
3748	+	* @return a non-null result from applying the given search
3749	+	* function on each key, or null if none
3750	+	* @since 1.8
3751	+	*/
3752	+	public <U> U searchKeys(long parallelismThreshold,
3753	+	Fun<? super K, ? extends U> searchFunction) {
3754	+	if (searchFunction == null) throw new NullPointerException();
3755	+	return new SearchKeysTask<K,V,U>
3756	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3757	+	searchFunction, new AtomicReference<U>()).invoke();
3758	+	}
3759	+
3760	+	/**
3761	+	* Returns the result of accumulating all keys using the given
3762	+	* reducer to combine values, or null if none.
3763	+	*
3764	+	* @param parallelismThreshold the (estimated) number of elements
3765	+	* needed for this operation to be executed in parallel
3766	+	* @param reducer a commutative associative combining function
3767	+	* @return the result of accumulating all keys using the given
3768	+	* reducer to combine values, or null if none
3769	+	* @since 1.8
3770	+	*/
3771	+	public K reduceKeys(long parallelismThreshold,
3772	+	BiFun<? super K, ? super K, ? extends K> reducer) {
3773	+	if (reducer == null) throw new NullPointerException();
3774	+	return new ReduceKeysTask<K,V>
3775	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3776	+	null, reducer).invoke();
3777	+	}
3778	+
3779	+	/**
3780	+	* Returns the result of accumulating the given transformation
3781	+	* of all keys using the given reducer to combine values, or
3782	+	* null if none.
3783	+	*
3784	+	* @param parallelismThreshold the (estimated) number of elements
3785	+	* needed for this operation to be executed in parallel
3786	+	* @param transformer a function returning the transformation
3787	+	* for an element, or null if there is no transformation (in
3788	+	* which case it is not combined)
3789	+	* @param reducer a commutative associative combining function
3790	+	* @return the result of accumulating the given transformation
3791	+	* of all keys
3792	+	* @since 1.8
3793	+	*/
3794	+	public <U> U reduceKeys(long parallelismThreshold,
3795	+	Fun<? super K, ? extends U> transformer,
3796	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3797	+	if (transformer == null || reducer == null)
3798	+	throw new NullPointerException();
3799	+	return new MapReduceKeysTask<K,V,U>
3800	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3801	+	null, transformer, reducer).invoke();
3802	+	}
3803	+
3804	+	/**
3805	+	* Returns the result of accumulating the given transformation
3806	+	* of all keys using the given reducer to combine values, and
3807	+	* the given basis as an identity value.
3808	+	*
3809	+	* @param parallelismThreshold the (estimated) number of elements
3810	+	* needed for this operation to be executed in parallel
3811	+	* @param transformer a function returning the transformation
3812	+	* for an element
3813	+	* @param basis the identity (initial default value) for the reduction
3814	+	* @param reducer a commutative associative combining function
3815	+	* @return the result of accumulating the given transformation
3816	+	* of all keys
3817	+	* @since 1.8
3818	+	*/
3819	+	public double reduceKeysToDouble(long parallelismThreshold,
3820	+	ObjectToDouble<? super K> transformer,
3821	+	double basis,
3822	+	DoubleByDoubleToDouble reducer) {
3823	+	if (transformer == null || reducer == null)
3824	+	throw new NullPointerException();
3825	+	return new MapReduceKeysToDoubleTask<K,V>
3826	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3827	+	null, transformer, basis, reducer).invoke();
3828	+	}
3829	+
3830	+	/**
3831	+	* Returns the result of accumulating the given transformation
3832	+	* of all keys using the given reducer to combine values, and
3833	+	* the given basis as an identity value.
3834	+	*
3835	+	* @param parallelismThreshold the (estimated) number of elements
3836	+	* needed for this operation to be executed in parallel
3837	+	* @param transformer a function returning the transformation
3838	+	* for an element
3839	+	* @param basis the identity (initial default value) for the reduction
3840	+	* @param reducer a commutative associative combining function
3841	+	* @return the result of accumulating the given transformation
3842	+	* of all keys
3843	+	* @since 1.8
3844	+	*/
3845	+	public long reduceKeysToLong(long parallelismThreshold,
3846	+	ObjectToLong<? super K> transformer,
3847	+	long basis,
3848	+	LongByLongToLong reducer) {
3849	+	if (transformer == null || reducer == null)
3850	+	throw new NullPointerException();
3851	+	return new MapReduceKeysToLongTask<K,V>
3852	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3853	+	null, transformer, basis, reducer).invoke();
3854	+	}
3855	+
3856	+	/**
3857	+	* Returns the result of accumulating the given transformation
3858	+	* of all keys using the given reducer to combine values, and
3859	+	* the given basis as an identity value.
3860	+	*
3861	+	* @param parallelismThreshold the (estimated) number of elements
3862	+	* needed for this operation to be executed in parallel
3863	+	* @param transformer a function returning the transformation
3864	+	* for an element
3865	+	* @param basis the identity (initial default value) for the reduction
3866	+	* @param reducer a commutative associative combining function
3867	+	* @return the result of accumulating the given transformation
3868	+	* of all keys
3869	+	* @since 1.8
3870	+	*/
3871	+	public int reduceKeysToInt(long parallelismThreshold,
3872	+	ObjectToInt<? super K> transformer,
3873	+	int basis,
3874	+	IntByIntToInt reducer) {
3875	+	if (transformer == null || reducer == null)
3876	+	throw new NullPointerException();
3877	+	return new MapReduceKeysToIntTask<K,V>
3878	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3879	+	null, transformer, basis, reducer).invoke();
3880	+	}
3881	+
3882	+	/**
3883	+	* Performs the given action for each value.
3884	+	*
3885	+	* @param parallelismThreshold the (estimated) number of elements
3886	+	* needed for this operation to be executed in parallel
3887	+	* @param action the action
3888	+	* @since 1.8
3889	+	*/
3890	+	public void forEachValue(long parallelismThreshold,
3891	+	Action<? super V> action) {
3892	+	if (action == null)
3893	+	throw new NullPointerException();
3894	+	new ForEachValueTask<K,V>
3895	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3896	+	action).invoke();
3897	+	}
3898	+
3899	+	/**
3900	+	* Performs the given action for each non-null transformation
3901	+	* of each value.
3902	+	*
3903	+	* @param parallelismThreshold the (estimated) number of elements
3904	+	* needed for this operation to be executed in parallel
3905	+	* @param transformer a function returning the transformation
3906	+	* for an element, or null if there is no transformation (in
3907	+	* which case the action is not applied)
3908	+	* @param action the action
3909	+	* @since 1.8
3910	+	*/
3911	+	public <U> void forEachValue(long parallelismThreshold,
3912	+	Fun<? super V, ? extends U> transformer,
3913	+	Action<? super U> action) {
3914	+	if (transformer == null || action == null)
3915	+	throw new NullPointerException();
3916	+	new ForEachTransformedValueTask<K,V,U>
3917	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3918	+	transformer, action).invoke();
3919	+	}
3920	+
3921	+	/**
3922	+	* Returns a non-null result from applying the given search
3923	+	* function on each value, or null if none.  Upon success,
3924	+	* further element processing is suppressed and the results of
3925	+	* any other parallel invocations of the search function are
3926	+	* ignored.
3927	+	*
3928	+	* @param parallelismThreshold the (estimated) number of elements
3929	+	* needed for this operation to be executed in parallel
3930	+	* @param searchFunction a function returning a non-null
3931	+	* result on success, else null
3932	+	* @return a non-null result from applying the given search
3933	+	* function on each value, or null if none
3934	+	* @since 1.8
3935	+	*/
3936	+	public <U> U searchValues(long parallelismThreshold,
3937	+	Fun<? super V, ? extends U> searchFunction) {
3938	+	if (searchFunction == null) throw new NullPointerException();
3939	+	return new SearchValuesTask<K,V,U>
3940	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3941	+	searchFunction, new AtomicReference<U>()).invoke();
3942	+	}
3943	+
3944	+	/**
3945	+	* Returns the result of accumulating all values using the
3946	+	* given reducer to combine values, or null if none.
3947	+	*
3948	+	* @param parallelismThreshold the (estimated) number of elements
3949	+	* needed for this operation to be executed in parallel
3950	+	* @param reducer a commutative associative combining function
3951	+	* @return the result of accumulating all values
3952	+	* @since 1.8
3953	+	*/
3954	+	public V reduceValues(long parallelismThreshold,
3955	+	BiFun<? super V, ? super V, ? extends V> reducer) {
3956	+	if (reducer == null) throw new NullPointerException();
3957	+	return new ReduceValuesTask<K,V>
3958	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3959	+	null, reducer).invoke();
3960	+	}
3961	+
3962	+	/**
3963	+	* Returns the result of accumulating the given transformation
3964	+	* of all values using the given reducer to combine values, or
3965	+	* null if none.
3966	+	*
3967	+	* @param parallelismThreshold the (estimated) number of elements
3968	+	* needed for this operation to be executed in parallel
3969	+	* @param transformer a function returning the transformation
3970	+	* for an element, or null if there is no transformation (in
3971	+	* which case it is not combined)
3972	+	* @param reducer a commutative associative combining function
3973	+	* @return the result of accumulating the given transformation
3974	+	* of all values
3975	+	* @since 1.8
3976	+	*/
3977	+	public <U> U reduceValues(long parallelismThreshold,
3978	+	Fun<? super V, ? extends U> transformer,
3979	+	BiFun<? super U, ? super U, ? extends U> reducer) {
3980	+	if (transformer == null || reducer == null)
3981	+	throw new NullPointerException();
3982	+	return new MapReduceValuesTask<K,V,U>
3983	+	(null, batchFor(parallelismThreshold), 0, 0, table,
3984	+	null, transformer, reducer).invoke();
3985	+	}
3986	+
3987	+	/**
3988	+	* Returns the result of accumulating the given transformation
3989	+	* of all values using the given reducer to combine values,
3990	+	* and the given basis as an identity value.
3991	+	*
3992	+	* @param parallelismThreshold the (estimated) number of elements
3993	+	* needed for this operation to be executed in parallel
3994	+	* @param transformer a function returning the transformation
3995	+	* for an element
3996	+	* @param basis the identity (initial default value) for the reduction
3997	+	* @param reducer a commutative associative combining function
3998	+	* @return the result of accumulating the given transformation
3999	+	* of all values
4000	+	* @since 1.8
4001	+	*/
4002	+	public double reduceValuesToDouble(long parallelismThreshold,
4003	+	ObjectToDouble<? super V> transformer,
4004	+	double basis,
4005	+	DoubleByDoubleToDouble reducer) {
4006	+	if (transformer == null || reducer == null)
4007	+	throw new NullPointerException();
4008	+	return new MapReduceValuesToDoubleTask<K,V>
4009	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4010	+	null, transformer, basis, reducer).invoke();
4011	+	}
4012	+
4013	+	/**
4014	+	* Returns the result of accumulating the given transformation
4015	+	* of all values using the given reducer to combine values,
4016	+	* and the given basis as an identity value.
4017	+	*
4018	+	* @param parallelismThreshold the (estimated) number of elements
4019	+	* needed for this operation to be executed in parallel
4020	+	* @param transformer a function returning the transformation
4021	+	* for an element
4022	+	* @param basis the identity (initial default value) for the reduction
4023	+	* @param reducer a commutative associative combining function
4024	+	* @return the result of accumulating the given transformation
4025	+	* of all values
4026	+	* @since 1.8
4027	+	*/
4028	+	public long reduceValuesToLong(long parallelismThreshold,
4029	+	ObjectToLong<? super V> transformer,
4030	+	long basis,
4031	+	LongByLongToLong reducer) {
4032	+	if (transformer == null || reducer == null)
4033	+	throw new NullPointerException();
4034	+	return new MapReduceValuesToLongTask<K,V>
4035	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4036	+	null, transformer, basis, reducer).invoke();
4037	+	}
4038	+
4039	+	/**
4040	+	* Returns the result of accumulating the given transformation
4041	+	* of all values using the given reducer to combine values,
4042	+	* and the given basis as an identity value.
4043	+	*
4044	+	* @param parallelismThreshold the (estimated) number of elements
4045	+	* needed for this operation to be executed in parallel
4046	+	* @param transformer a function returning the transformation
4047	+	* for an element
4048	+	* @param basis the identity (initial default value) for the reduction
4049	+	* @param reducer a commutative associative combining function
4050	+	* @return the result of accumulating the given transformation
4051	+	* of all values
4052	+	* @since 1.8
4053	+	*/
4054	+	public int reduceValuesToInt(long parallelismThreshold,
4055	+	ObjectToInt<? super V> transformer,
4056	+	int basis,
4057	+	IntByIntToInt reducer) {
4058	+	if (transformer == null || reducer == null)
4059	+	throw new NullPointerException();
4060	+	return new MapReduceValuesToIntTask<K,V>
4061	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4062	+	null, transformer, basis, reducer).invoke();
4063	+	}
4064	+
4065	+	/**
4066	+	* Performs the given action for each entry.
4067	+	*
4068	+	* @param parallelismThreshold the (estimated) number of elements
4069	+	* needed for this operation to be executed in parallel
4070	+	* @param action the action
4071	+	* @since 1.8
4072	+	*/
4073	+	public void forEachEntry(long parallelismThreshold,
4074	+	Action<? super Map.Entry<K,V>> action) {
4075	+	if (action == null) throw new NullPointerException();
4076	+	new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table,
4077	+	action).invoke();
4078	+	}
4079	+
4080	+	/**
4081	+	* Performs the given action for each non-null transformation
4082	+	* of each entry.
4083	+	*
4084	+	* @param parallelismThreshold the (estimated) number of elements
4085	+	* needed for this operation to be executed in parallel
4086	+	* @param transformer a function returning the transformation
4087	+	* for an element, or null if there is no transformation (in
4088	+	* which case the action is not applied)
4089	+	* @param action the action
4090	+	* @since 1.8
4091	+	*/
4092	+	public <U> void forEachEntry(long parallelismThreshold,
4093	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
4094	+	Action<? super U> action) {
4095	+	if (transformer == null || action == null)
4096	+	throw new NullPointerException();
4097	+	new ForEachTransformedEntryTask<K,V,U>
4098	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4099	+	transformer, action).invoke();
4100	+	}
4101	+
4102	+	/**
4103	+	* Returns a non-null result from applying the given search
4104	+	* function on each entry, or null if none.  Upon success,
4105	+	* further element processing is suppressed and the results of
4106	+	* any other parallel invocations of the search function are
4107	+	* ignored.
4108	+	*
4109	+	* @param parallelismThreshold the (estimated) number of elements
4110	+	* needed for this operation to be executed in parallel
4111	+	* @param searchFunction a function returning a non-null
4112	+	* result on success, else null
4113	+	* @return a non-null result from applying the given search
4114	+	* function on each entry, or null if none
4115	+	* @since 1.8
4116	+	*/
4117	+	public <U> U searchEntries(long parallelismThreshold,
4118	+	Fun<Map.Entry<K,V>, ? extends U> searchFunction) {
4119	+	if (searchFunction == null) throw new NullPointerException();
4120	+	return new SearchEntriesTask<K,V,U>
4121	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4122	+	searchFunction, new AtomicReference<U>()).invoke();
4123	+	}
4124	+
4125	+	/**
4126	+	* Returns the result of accumulating all entries using the
4127	+	* given reducer to combine values, or null if none.
4128	+	*
4129	+	* @param parallelismThreshold the (estimated) number of elements
4130	+	* needed for this operation to be executed in parallel
4131	+	* @param reducer a commutative associative combining function
4132	+	* @return the result of accumulating all entries
4133	+	* @since 1.8
4134	+	*/
4135	+	public Map.Entry<K,V> reduceEntries(long parallelismThreshold,
4136	+	BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
4137	+	if (reducer == null) throw new NullPointerException();
4138	+	return new ReduceEntriesTask<K,V>
4139	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4140	+	null, reducer).invoke();
4141	+	}
4142	+
4143	+	/**
4144	+	* Returns the result of accumulating the given transformation
4145	+	* of all entries using the given reducer to combine values,
4146	+	* or null if none.
4147	+	*
4148	+	* @param parallelismThreshold the (estimated) number of elements
4149	+	* needed for this operation to be executed in parallel
4150	+	* @param transformer a function returning the transformation
4151	+	* for an element, or null if there is no transformation (in
4152	+	* which case it is not combined)
4153	+	* @param reducer a commutative associative combining function
4154	+	* @return the result of accumulating the given transformation
4155	+	* of all entries
4156	+	* @since 1.8
4157	+	*/
4158	+	public <U> U reduceEntries(long parallelismThreshold,
4159	+	Fun<Map.Entry<K,V>, ? extends U> transformer,
4160	+	BiFun<? super U, ? super U, ? extends U> reducer) {
4161	+	if (transformer == null || reducer == null)
4162	+	throw new NullPointerException();
4163	+	return new MapReduceEntriesTask<K,V,U>
4164	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4165	+	null, transformer, reducer).invoke();
4166	+	}
4167	+
4168	+	/**
4169	+	* Returns the result of accumulating the given transformation
4170	+	* of all entries using the given reducer to combine values,
4171	+	* and the given basis as an identity value.
4172	+	*
4173	+	* @param parallelismThreshold the (estimated) number of elements
4174	+	* needed for this operation to be executed in parallel
4175	+	* @param transformer a function returning the transformation
4176	+	* for an element
4177	+	* @param basis the identity (initial default value) for the reduction
4178	+	* @param reducer a commutative associative combining function
4179	+	* @return the result of accumulating the given transformation
4180	+	* of all entries
4181	+	* @since 1.8
4182	+	*/
4183	+	public double reduceEntriesToDouble(long parallelismThreshold,
4184	+	ObjectToDouble<Map.Entry<K,V>> transformer,
4185	+	double basis,
4186	+	DoubleByDoubleToDouble reducer) {
4187	+	if (transformer == null || reducer == null)
4188	+	throw new NullPointerException();
4189	+	return new MapReduceEntriesToDoubleTask<K,V>
4190	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4191	+	null, transformer, basis, reducer).invoke();
4192	+	}
4193	+
4194	+	/**
4195	+	* Returns the result of accumulating the given transformation
4196	+	* of all entries using the given reducer to combine values,
4197	+	* and the given basis as an identity value.
4198	+	*
4199	+	* @param parallelismThreshold the (estimated) number of elements
4200	+	* needed for this operation to be executed in parallel
4201	+	* @param transformer a function returning the transformation
4202	+	* for an element
4203	+	* @param basis the identity (initial default value) for the reduction
4204	+	* @param reducer a commutative associative combining function
4205	+	* @return the result of accumulating the given transformation
4206	+	* of all entries
4207	+	* @since 1.8
4208	+	*/
4209	+	public long reduceEntriesToLong(long parallelismThreshold,
4210	+	ObjectToLong<Map.Entry<K,V>> transformer,
4211	+	long basis,
4212	+	LongByLongToLong reducer) {
4213	+	if (transformer == null || reducer == null)
4214	+	throw new NullPointerException();
4215	+	return new MapReduceEntriesToLongTask<K,V>
4216	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4217	+	null, transformer, basis, reducer).invoke();
4218	+	}
4219	+
4220	+	/**
4221	+	* Returns the result of accumulating the given transformation
4222	+	* of all entries using the given reducer to combine values,
4223	+	* and the given basis as an identity value.
4224	+	*
4225	+	* @param parallelismThreshold the (estimated) number of elements
4226	+	* needed for this operation to be executed in parallel
4227	+	* @param transformer a function returning the transformation
4228	+	* for an element
4229	+	* @param basis the identity (initial default value) for the reduction
4230	+	* @param reducer a commutative associative combining function
4231	+	* @return the result of accumulating the given transformation
4232	+	* of all entries
4233	+	* @since 1.8
4234	+	*/
4235	+	public int reduceEntriesToInt(long parallelismThreshold,
4236	+	ObjectToInt<Map.Entry<K,V>> transformer,
4237	+	int basis,
4238	+	IntByIntToInt reducer) {
4239	+	if (transformer == null || reducer == null)
4240	+	throw new NullPointerException();
4241	+	return new MapReduceEntriesToIntTask<K,V>
4242	+	(null, batchFor(parallelismThreshold), 0, 0, table,
4243	+	null, transformer, basis, reducer).invoke();
4244	+	}
4245	+
4246	+
4247		/* ----------------Views -------------- */
4248
4249		/**
4250		* Base class for views.
4251		*/
4252	<	static abstract class MapView<K, V> {
4253	<	final ConcurrentHashMapV8<K, V> map;
4254	<	MapView(ConcurrentHashMapV8<K, V> map)  { this.map = map; }
4255	<	public final int size()                 { return map.size(); }
4256	<	public final boolean isEmpty()          { return map.isEmpty(); }
4257	<	public final void clear()               { map.clear(); }
4252	>	abstract static class CollectionView<K,V,E>
4253	>	implements Collection<E>, java.io.Serializable {
4254	>	private static final long serialVersionUID = 7249069246763182397L;
4255	>	final ConcurrentHashMapV8<K,V> map;
4256	>	CollectionView(ConcurrentHashMapV8<K,V> map)  { this.map = map; }
4257	>
4258	>	/**
4259	>	* Returns the map backing this view.
4260	>	*
4261	>	* @return the map backing this view
4262	>	*/
4263	>	public ConcurrentHashMapV8<K,V> getMap() { return map; }
4264	>
4265	>	/**
4266	>	* Removes all of the elements from this view, by removing all
4267	>	* the mappings from the map backing this view.
4268	>	*/
4269	>	public final void clear()      { map.clear(); }
4270	>	public final int size()        { return map.size(); }
4271	>	public final boolean isEmpty() { return map.isEmpty(); }
4272
4273		// implementations below rely on concrete classes supplying these
4274	<	abstract public Iterator<?> iterator();
4275	<	abstract public boolean contains(Object o);
4276	<	abstract public boolean remove(Object o);
4274	>	// abstract methods
4275	>	/**
4276	>	* Returns a "weakly consistent" iterator that will never
4277	>	* throw {@link ConcurrentModificationException}, and
4278	>	* guarantees to traverse elements as they existed upon
4279	>	* construction of the iterator, and may (but is not
4280	>	* guaranteed to) reflect any modifications subsequent to
4281	>	* construction.
4282	>	*/
4283	>	public abstract Iterator<E> iterator();
4284	>	public abstract boolean contains(Object o);
4285	>	public abstract boolean remove(Object o);
4286
4287		private static final String oomeMsg = "Required array size too large";
4288
4289		public final Object[] toArray() {
4290	<	long sz = map.longSize();
4291	<	if (sz > (long)(MAX_ARRAY_SIZE))
4290	>	long sz = map.mappingCount();
4291	>	if (sz > MAX_ARRAY_SIZE)
4292		throw new OutOfMemoryError(oomeMsg);
4293		int n = (int)sz;
4294		Object[] r = new Object[n];
4295		int i = 0;
4296	<	Iterator<?> it = iterator();
2997	<	while (it.hasNext()) {
4296	>	for (E e : this) {
4297		if (i == n) {
4298		if (n >= MAX_ARRAY_SIZE)
4299		throw new OutOfMemoryError(oomeMsg);
#	Line 3004 | Line 4303 | public class ConcurrentHashMapV8<K, V>
4303		n += (n >>> 1) + 1;
4304		r = Arrays.copyOf(r, n);
4305		}
4306	<	r[i++] = it.next();
4306	>	r[i++] = e;
4307		}
4308		return (i == n) ? r : Arrays.copyOf(r, i);
4309		}
4310
4311		@SuppressWarnings("unchecked")
4312		public final <T> T[] toArray(T[] a) {
4313	<	long sz = map.longSize();
4314	<	if (sz > (long)(MAX_ARRAY_SIZE))
4313	>	long sz = map.mappingCount();
4314	>	if (sz > MAX_ARRAY_SIZE)
4315		throw new OutOfMemoryError(oomeMsg);
4316		int m = (int)sz;
4317		T[] r = (a.length >= m) ? a :
#	Line 3020 | Line 4319 | public class ConcurrentHashMapV8<K, V>
4319		.newInstance(a.getClass().getComponentType(), m);
4320		int n = r.length;
4321		int i = 0;
4322	<	Iterator<?> it = iterator();
3024	<	while (it.hasNext()) {
4322	>	for (E e : this) {
4323		if (i == n) {
4324		if (n >= MAX_ARRAY_SIZE)
4325		throw new OutOfMemoryError(oomeMsg);
#	Line 3031 | Line 4329 | public class ConcurrentHashMapV8<K, V>
4329		n += (n >>> 1) + 1;
4330		r = Arrays.copyOf(r, n);
4331		}
4332	<	r[i++] = (T)it.next();
4332	>	r[i++] = (T)e;
4333		}
4334		if (a == r && i < n) {
4335		r[i] = null; // null-terminate
#	Line 3040 | Line 4338 | public class ConcurrentHashMapV8<K, V>
4338		return (i == n) ? r : Arrays.copyOf(r, i);
4339		}
4340
4341	<	public final int hashCode() {
4342	<	int h = 0;
4343	<	for (Iterator<?> it = iterator(); it.hasNext();)
4344	<	h += it.next().hashCode();
4345	<	return h;
4346	<	}
4347	<
4341	>	/**
4342	>	* Returns a string representation of this collection.
4343	>	* The string representation consists of the string representations
4344	>	* of the collection's elements in the order they are returned by
4345	>	* its iterator, enclosed in square brackets ({@code "[]"}).
4346	>	* Adjacent elements are separated by the characters {@code ", "}
4347	>	* (comma and space).  Elements are converted to strings as by
4348	>	* {@link String#valueOf(Object)}.
4349	>	*
4350	>	* @return a string representation of this collection
4351	>	*/
4352		public final String toString() {
4353		StringBuilder sb = new StringBuilder();
4354		sb.append('[');
4355	<	Iterator<?> it = iterator();
4355	>	Iterator<E> it = iterator();
4356		if (it.hasNext()) {
4357		for (;;) {
4358		Object e = it.next();
#	Line 3065 | Line 4367 | public class ConcurrentHashMapV8<K, V>
4367
4368		public final boolean containsAll(Collection<?> c) {
4369		if (c != this) {
4370	<	for (Iterator<?> it = c.iterator(); it.hasNext();) {
3069	<	Object e = it.next();
4370	>	for (Object e : c) {
4371		if (e == null || !contains(e))
4372		return false;
4373		}
#	Line 3076 | Line 4377 | public class ConcurrentHashMapV8<K, V>
4377
4378		public final boolean removeAll(Collection<?> c) {
4379		boolean modified = false;
4380	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4380	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4381		if (c.contains(it.next())) {
4382		it.remove();
4383		modified = true;
#	Line 3087 | Line 4388 | public class ConcurrentHashMapV8<K, V>
4388
4389		public final boolean retainAll(Collection<?> c) {
4390		boolean modified = false;
4391	<	for (Iterator<?> it = iterator(); it.hasNext();) {
4391	>	for (Iterator<E> it = iterator(); it.hasNext();) {
4392		if (!c.contains(it.next())) {
4393		it.remove();
4394		modified = true;
#	Line 3098 | Line 4399 | public class ConcurrentHashMapV8<K, V>
4399
4400		}
4401
4402	<	static final class KeySet<K,V> extends MapView<K,V> implements Set<K> {
4403	<	KeySet(ConcurrentHashMapV8<K, V> map)   { super(map); }
4404	<	public final boolean contains(Object o) { return map.containsKey(o); }
4405	<	public final boolean remove(Object o)   { return map.remove(o) != null; }
4406	<	public final Iterator<K> iterator() {
4407	<	return new KeyIterator<K,V>(map);
4402	>	/**
4403	>	* A view of a ConcurrentHashMapV8 as a {@link Set} of keys, in
4404	>	* which additions may optionally be enabled by mapping to a
4405	>	* common value.  This class cannot be directly instantiated.
4406	>	* See {@link #keySet() keySet()},
4407	>	* {@link #keySet(Object) keySet(V)},
4408	>	* {@link #newKeySet() newKeySet()},
4409	>	* {@link #newKeySet(int) newKeySet(int)}.
4410	>	*
4411	>	* @since 1.8
4412	>	*/
4413	>	public static class KeySetView<K,V> extends CollectionView<K,V,K>
4414	>	implements Set<K>, java.io.Serializable {
4415	>	private static final long serialVersionUID = 7249069246763182397L;
4416	>	private final V value;
4417	>	KeySetView(ConcurrentHashMapV8<K,V> map, V value) {  // non-public
4418	>	super(map);
4419	>	this.value = value;
4420		}
4421	<	public final boolean add(K e) {
4422	<	throw new UnsupportedOperationException();
4421	>
4422	>	/**
4423	>	* Returns the default mapped value for additions,
4424	>	* or {@code null} if additions are not supported.
4425	>	*
4426	>	* @return the default mapped value for additions, or {@code null}
4427	>	* if not supported
4428	>	*/
4429	>	public V getMappedValue() { return value; }
4430	>
4431	>	/**
4432	>	* {@inheritDoc}
4433	>	* @throws NullPointerException if the specified key is null
4434	>	*/
4435	>	public boolean contains(Object o) { return map.containsKey(o); }
4436	>
4437	>	/**
4438	>	* Removes the key from this map view, by removing the key (and its
4439	>	* corresponding value) from the backing map.  This method does
4440	>	* nothing if the key is not in the map.
4441	>	*
4442	>	* @param  o the key to be removed from the backing map
4443	>	* @return {@code true} if the backing map contained the specified key
4444	>	* @throws NullPointerException if the specified key is null
4445	>	*/
4446	>	public boolean remove(Object o) { return map.remove(o) != null; }
4447	>
4448	>	/**
4449	>	* @return an iterator over the keys of the backing map
4450	>	*/
4451	>	public Iterator<K> iterator() {
4452	>	Node<K,V>[] t;
4453	>	ConcurrentHashMapV8<K,V> m = map;
4454	>	int f = (t = m.table) == null ? 0 : t.length;
4455	>	return new KeyIterator<K,V>(t, f, 0, f, m);
4456		}
4457	<	public final boolean addAll(Collection<? extends K> c) {
4458	<	throw new UnsupportedOperationException();
4457	>
4458	>	/**
4459	>	* Adds the specified key to this set view by mapping the key to
4460	>	* the default mapped value in the backing map, if defined.
4461	>	*
4462	>	* @param e key to be added
4463	>	* @return {@code true} if this set changed as a result of the call
4464	>	* @throws NullPointerException if the specified key is null
4465	>	* @throws UnsupportedOperationException if no default mapped value
4466	>	* for additions was provided
4467	>	*/
4468	>	public boolean add(K e) {
4469	>	V v;
4470	>	if ((v = value) == null)
4471	>	throw new UnsupportedOperationException();
4472	>	return map.putVal(e, v, true) == null;
4473	>	}
4474	>
4475	>	/**
4476	>	* Adds all of the elements in the specified collection to this set,
4477	>	* as if by calling {@link #add} on each one.
4478	>	*
4479	>	* @param c the elements to be inserted into this set
4480	>	* @return {@code true} if this set changed as a result of the call
4481	>	* @throws NullPointerException if the collection or any of its
4482	>	* elements are {@code null}
4483	>	* @throws UnsupportedOperationException if no default mapped value
4484	>	* for additions was provided
4485	>	*/
4486	>	public boolean addAll(Collection<? extends K> c) {
4487	>	boolean added = false;
4488	>	V v;
4489	>	if ((v = value) == null)
4490	>	throw new UnsupportedOperationException();
4491	>	for (K e : c) {
4492	>	if (map.putVal(e, v, true) == null)
4493	>	added = true;
4494	>	}
4495	>	return added;
4496		}
4497	+
4498	+	public int hashCode() {
4499	+	int h = 0;
4500	+	for (K e : this)
4501	+	h += e.hashCode();
4502	+	return h;
4503	+	}
4504	+
4505		public boolean equals(Object o) {
4506		Set<?> c;
4507		return ((o instanceof Set) &&
4508		((c = (Set<?>)o) == this ||
4509		(containsAll(c) && c.containsAll(this))));
4510		}
4511	+
4512	+	public ConcurrentHashMapSpliterator<K> spliterator() {
4513	+	Node<K,V>[] t;
4514	+	ConcurrentHashMapV8<K,V> m = map;
4515	+	long n = m.sumCount();
4516	+	int f = (t = m.table) == null ? 0 : t.length;
4517	+	return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4518	+	}
4519	+
4520	+	public void forEach(Action<? super K> action) {
4521	+	if (action == null) throw new NullPointerException();
4522	+	Node<K,V>[] t;
4523	+	if ((t = map.table) != null) {
4524	+	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4525	+	for (Node<K,V> p; (p = it.advance()) != null; )
4526	+	action.apply(p.key);
4527	+	}
4528	+	}
4529		}
4530
4531	<	static final class Values<K,V> extends MapView<K,V>
4532	<	implements Collection<V> {
4533	<	Values(ConcurrentHashMapV8<K, V> map)   { super(map); }
4534	<	public final boolean contains(Object o) { return map.containsValue(o); }
4531	>	/**
4532	>	* A view of a ConcurrentHashMapV8 as a {@link Collection} of
4533	>	* values, in which additions are disabled. This class cannot be
4534	>	* directly instantiated. See {@link #values()}.
4535	>	*/
4536	>	static final class ValuesView<K,V> extends CollectionView<K,V,V>
4537	>	implements Collection<V>, java.io.Serializable {
4538	>	private static final long serialVersionUID = 2249069246763182397L;
4539	>	ValuesView(ConcurrentHashMapV8<K,V> map) { super(map); }
4540	>	public final boolean contains(Object o) {
4541	>	return map.containsValue(o);
4542	>	}
4543	>
4544		public final boolean remove(Object o) {
4545		if (o != null) {
4546	<	Iterator<V> it = new ValueIterator<K,V>(map);
3129	<	while (it.hasNext()) {
4546	>	for (Iterator<V> it = iterator(); it.hasNext();) {
4547		if (o.equals(it.next())) {
4548		it.remove();
4549		return true;
#	Line 3135 | Line 4552 | public class ConcurrentHashMapV8<K, V>
4552		}
4553		return false;
4554		}
4555	+
4556		public final Iterator<V> iterator() {
4557	<	return new ValueIterator<K,V>(map);
4557	>	ConcurrentHashMapV8<K,V> m = map;
4558	>	Node<K,V>[] t;
4559	>	int f = (t = m.table) == null ? 0 : t.length;
4560	>	return new ValueIterator<K,V>(t, f, 0, f, m);
4561		}
4562	+
4563		public final boolean add(V e) {
4564		throw new UnsupportedOperationException();
4565		}
4566		public final boolean addAll(Collection<? extends V> c) {
4567		throw new UnsupportedOperationException();
4568		}
4569	+
4570	+	public ConcurrentHashMapSpliterator<V> spliterator() {
4571	+	Node<K,V>[] t;
4572	+	ConcurrentHashMapV8<K,V> m = map;
4573	+	long n = m.sumCount();
4574	+	int f = (t = m.table) == null ? 0 : t.length;
4575	+	return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n);
4576	+	}
4577	+
4578	+	public void forEach(Action<? super V> action) {
4579	+	if (action == null) throw new NullPointerException();
4580	+	Node<K,V>[] t;
4581	+	if ((t = map.table) != null) {
4582	+	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4583	+	for (Node<K,V> p; (p = it.advance()) != null; )
4584	+	action.apply(p.val);
4585	+	}
4586	+	}
4587		}
4588
4589	<	static final class EntrySet<K,V> extends MapView<K,V>
4590	<	implements Set<Map.Entry<K,V>> {
4591	<	EntrySet(ConcurrentHashMapV8<K, V> map) { super(map); }
4592	<	public final boolean contains(Object o) {
4589	>	/**
4590	>	* A view of a ConcurrentHashMapV8 as a {@link Set} of (key, value)
4591	>	* entries.  This class cannot be directly instantiated. See
4592	>	* {@link #entrySet()}.
4593	>	*/
4594	>	static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>>
4595	>	implements Set<Map.Entry<K,V>>, java.io.Serializable {
4596	>	private static final long serialVersionUID = 2249069246763182397L;
4597	>	EntrySetView(ConcurrentHashMapV8<K,V> map) { super(map); }
4598	>
4599	>	public boolean contains(Object o) {
4600		Object k, v, r; Map.Entry<?,?> e;
4601		return ((o instanceof Map.Entry) &&
4602		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
#	Line 3157 | Line 4604 | public class ConcurrentHashMapV8<K, V>
4604		(v = e.getValue()) != null &&
4605		(v == r || v.equals(r)));
4606		}
4607	<	public final boolean remove(Object o) {
4607	>
4608	>	public boolean remove(Object o) {
4609		Object k, v; Map.Entry<?,?> e;
4610		return ((o instanceof Map.Entry) &&
4611		(k = (e = (Map.Entry<?,?>)o).getKey()) != null &&
4612		(v = e.getValue()) != null &&
4613		map.remove(k, v));
4614		}
4615	<	public final Iterator<Map.Entry<K,V>> iterator() {
4616	<	return new EntryIterator<K,V>(map);
4615	>
4616	>	/**
4617	>	* @return an iterator over the entries of the backing map
4618	>	*/
4619	>	public Iterator<Map.Entry<K,V>> iterator() {
4620	>	ConcurrentHashMapV8<K,V> m = map;
4621	>	Node<K,V>[] t;
4622	>	int f = (t = m.table) == null ? 0 : t.length;
4623	>	return new EntryIterator<K,V>(t, f, 0, f, m);
4624		}
4625	<	public final boolean add(Entry<K,V> e) {
4626	<	throw new UnsupportedOperationException();
4625	>
4626	>	public boolean add(Entry<K,V> e) {
4627	>	return map.putVal(e.getKey(), e.getValue(), false) == null;
4628		}
4629	<	public final boolean addAll(Collection<? extends Entry<K,V>> c) {
4630	<	throw new UnsupportedOperationException();
4629	>
4630	>	public boolean addAll(Collection<? extends Entry<K,V>> c) {
4631	>	boolean added = false;
4632	>	for (Entry<K,V> e : c) {
4633	>	if (add(e))
4634	>	added = true;
4635	>	}
4636	>	return added;
4637		}
4638	<	public boolean equals(Object o) {
4638	>
4639	>	public final int hashCode() {
4640	>	int h = 0;
4641	>	Node<K,V>[] t;
4642	>	if ((t = map.table) != null) {
4643	>	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4644	>	for (Node<K,V> p; (p = it.advance()) != null; ) {
4645	>	h += p.hashCode();
4646	>	}
4647	>	}
4648	>	return h;
4649	>	}
4650	>
4651	>	public final boolean equals(Object o) {
4652		Set<?> c;
4653		return ((o instanceof Set) &&
4654		((c = (Set<?>)o) == this ||
4655		(containsAll(c) && c.containsAll(this))));
4656		}
4657	+
4658	+	public ConcurrentHashMapSpliterator<Map.Entry<K,V>> spliterator() {
4659	+	Node<K,V>[] t;
4660	+	ConcurrentHashMapV8<K,V> m = map;
4661	+	long n = m.sumCount();
4662	+	int f = (t = m.table) == null ? 0 : t.length;
4663	+	return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m);
4664	+	}
4665	+
4666	+	public void forEach(Action<? super Map.Entry<K,V>> action) {
4667	+	if (action == null) throw new NullPointerException();
4668	+	Node<K,V>[] t;
4669	+	if ((t = map.table) != null) {
4670	+	Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length);
4671	+	for (Node<K,V> p; (p = it.advance()) != null; )
4672	+	action.apply(new MapEntry<K,V>(p.key, p.val, map));
4673	+	}
4674	+	}
4675	+
4676		}
4677
4678	<	/* ---------------- Serialization Support -------------- */
4678	>	// -------------------------------------------------------
4679
4680		/**
4681	<	* Stripped-down version of helper class used in previous version,
4682	<	* declared for the sake of serialization compatibility
4681	>	* Base class for bulk tasks. Repeats some fields and code from
4682	>	* class Traverser, because we need to subclass CountedCompleter.
4683		*/
4684	<	static class Segment<K,V> implements Serializable {
4685	<	private static final long serialVersionUID = 2249069246763182397L;
4686	<	final float loadFactor;
4687	<	Segment(float lf) { this.loadFactor = lf; }
4684	>	abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
4685	>	Node<K,V>[] tab;        // same as Traverser
4686	>	Node<K,V> next;
4687	>	int index;
4688	>	int baseIndex;
4689	>	int baseLimit;
4690	>	final int baseSize;
4691	>	int batch;              // split control
4692	>
4693	>	BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) {
4694	>	super(par);
4695	>	this.batch = b;
4696	>	this.index = this.baseIndex = i;
4697	>	if ((this.tab = t) == null)
4698	>	this.baseSize = this.baseLimit = 0;
4699	>	else if (par == null)
4700	>	this.baseSize = this.baseLimit = t.length;
4701	>	else {
4702	>	this.baseLimit = f;
4703	>	this.baseSize = par.baseSize;
4704	>	}
4705	>	}
4706	>
4707	>	/**
4708	>	* Same as Traverser version
4709	>	*/
4710	>	final Node<K,V> advance() {
4711	>	Node<K,V> e;
4712	>	if ((e = next) != null)
4713	>	e = e.next;
4714	>	for (;;) {
4715	>	Node<K,V>[] t; int i, n; K ek;  // must use locals in checks
4716	>	if (e != null)
4717	>	return next = e;
4718	>	if (baseIndex >= baseLimit || (t = tab) == null ||
4719	>	(n = t.length) <= (i = index) || i < 0)
4720	>	return next = null;
4721	>	if ((e = tabAt(t, index)) != null && e.hash < 0) {
4722	>	if (e instanceof ForwardingNode) {
4723	>	tab = ((ForwardingNode<K,V>)e).nextTable;
4724	>	e = null;
4725	>	continue;
4726	>	}
4727	>	else if (e instanceof TreeBin)
4728	>	e = ((TreeBin<K,V>)e).first;
4729	>	else
4730	>	e = null;
4731	>	}
4732	>	if ((index += baseSize) >= n)
4733	>	index = ++baseIndex;    // visit upper slots if present
4734	>	}
4735	>	}
4736		}
4737
4738	<	/**
4739	<	* Saves the state of the {@code ConcurrentHashMapV8} instance to a
4740	<	* stream (i.e., serializes it).
4741	<	* @param s the stream
4742	<	* @serialData
4743	<	* the key (Object) and value (Object)
4744	<	* for each key-value mapping, followed by a null pair.
4745	<	* The key-value mappings are emitted in no particular order.
4746	<	*/
4747	<	@SuppressWarnings("unchecked")
4748	<	private void writeObject(java.io.ObjectOutputStream s)
4749	<	throws java.io.IOException {
4750	<	if (segments == null) { // for serialization compatibility
4751	<	segments = (Segment<K,V>[])
4752	<	new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL];
4753	<	for (int i = 0; i < segments.length; ++i)
4754	<	segments[i] = new Segment<K,V>(LOAD_FACTOR);
4755	<	}
4756	<	s.defaultWriteObject();
4757	<	InternalIterator<K,V> it = new InternalIterator<K,V>(this);
4758	<	Object v;
4759	<	while ((v = it.advance()) != null) {
4760	<	s.writeObject(it.nextKey);
4761	<	s.writeObject(v);
4738	>	/*
4739	>	* Task classes. Coded in a regular but ugly format/style to
4740	>	* simplify checks that each variant differs in the right way from
4741	>	* others. The null screenings exist because compilers cannot tell
4742	>	* that we've already null-checked task arguments, so we force
4743	>	* simplest hoisted bypass to help avoid convoluted traps.
4744	>	*/
4745	>	@SuppressWarnings("serial")
4746	>	static final class ForEachKeyTask<K,V>
4747	>	extends BulkTask<K,V,Void> {
4748	>	final Action<? super K> action;
4749	>	ForEachKeyTask
4750	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4751	>	Action<? super K> action) {
4752	>	super(p, b, i, f, t);
4753	>	this.action = action;
4754	>	}
4755	>	public final void compute() {
4756	>	final Action<? super K> action;
4757	>	if ((action = this.action) != null) {
4758	>	for (int i = baseIndex, f, h; batch > 0 &&
4759	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4760	>	addToPendingCount(1);
4761	>	new ForEachKeyTask<K,V>
4762	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4763	>	action).fork();
4764	>	}
4765	>	for (Node<K,V> p; (p = advance()) != null;)
4766	>	action.apply(p.key);
4767	>	propagateCompletion();
4768	>	}
4769	>	}
4770	>	}
4771	>
4772	>	@SuppressWarnings("serial")
4773	>	static final class ForEachValueTask<K,V>
4774	>	extends BulkTask<K,V,Void> {
4775	>	final Action<? super V> action;
4776	>	ForEachValueTask
4777	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4778	>	Action<? super V> action) {
4779	>	super(p, b, i, f, t);
4780	>	this.action = action;
4781	>	}
4782	>	public final void compute() {
4783	>	final Action<? super V> action;
4784	>	if ((action = this.action) != null) {
4785	>	for (int i = baseIndex, f, h; batch > 0 &&
4786	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4787	>	addToPendingCount(1);
4788	>	new ForEachValueTask<K,V>
4789	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4790	>	action).fork();
4791	>	}
4792	>	for (Node<K,V> p; (p = advance()) != null;)
4793	>	action.apply(p.val);
4794	>	propagateCompletion();
4795	>	}
4796	>	}
4797	>	}
4798	>
4799	>	@SuppressWarnings("serial")
4800	>	static final class ForEachEntryTask<K,V>
4801	>	extends BulkTask<K,V,Void> {
4802	>	final Action<? super Entry<K,V>> action;
4803	>	ForEachEntryTask
4804	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4805	>	Action<? super Entry<K,V>> action) {
4806	>	super(p, b, i, f, t);
4807	>	this.action = action;
4808	>	}
4809	>	public final void compute() {
4810	>	final Action<? super Entry<K,V>> action;
4811	>	if ((action = this.action) != null) {
4812	>	for (int i = baseIndex, f, h; batch > 0 &&
4813	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4814	>	addToPendingCount(1);
4815	>	new ForEachEntryTask<K,V>
4816	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4817	>	action).fork();
4818	>	}
4819	>	for (Node<K,V> p; (p = advance()) != null; )
4820	>	action.apply(p);
4821	>	propagateCompletion();
4822	>	}
4823	>	}
4824	>	}
4825	>
4826	>	@SuppressWarnings("serial")
4827	>	static final class ForEachMappingTask<K,V>
4828	>	extends BulkTask<K,V,Void> {
4829	>	final BiAction<? super K, ? super V> action;
4830	>	ForEachMappingTask
4831	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4832	>	BiAction<? super K,? super V> action) {
4833	>	super(p, b, i, f, t);
4834	>	this.action = action;
4835	>	}
4836	>	public final void compute() {
4837	>	final BiAction<? super K, ? super V> action;
4838	>	if ((action = this.action) != null) {
4839	>	for (int i = baseIndex, f, h; batch > 0 &&
4840	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4841	>	addToPendingCount(1);
4842	>	new ForEachMappingTask<K,V>
4843	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4844	>	action).fork();
4845	>	}
4846	>	for (Node<K,V> p; (p = advance()) != null; )
4847	>	action.apply(p.key, p.val);
4848	>	propagateCompletion();
4849	>	}
4850	>	}
4851	>	}
4852	>
4853	>	@SuppressWarnings("serial")
4854	>	static final class ForEachTransformedKeyTask<K,V,U>
4855	>	extends BulkTask<K,V,Void> {
4856	>	final Fun<? super K, ? extends U> transformer;
4857	>	final Action<? super U> action;
4858	>	ForEachTransformedKeyTask
4859	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4860	>	Fun<? super K, ? extends U> transformer, Action<? super U> action) {
4861	>	super(p, b, i, f, t);
4862	>	this.transformer = transformer; this.action = action;
4863	>	}
4864	>	public final void compute() {
4865	>	final Fun<? super K, ? extends U> transformer;
4866	>	final Action<? super U> action;
4867	>	if ((transformer = this.transformer) != null &&
4868	>	(action = this.action) != null) {
4869	>	for (int i = baseIndex, f, h; batch > 0 &&
4870	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4871	>	addToPendingCount(1);
4872	>	new ForEachTransformedKeyTask<K,V,U>
4873	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4874	>	transformer, action).fork();
4875	>	}
4876	>	for (Node<K,V> p; (p = advance()) != null; ) {
4877	>	U u;
4878	>	if ((u = transformer.apply(p.key)) != null)
4879	>	action.apply(u);
4880	>	}
4881	>	propagateCompletion();
4882	>	}
4883	>	}
4884	>	}
4885	>
4886	>	@SuppressWarnings("serial")
4887	>	static final class ForEachTransformedValueTask<K,V,U>
4888	>	extends BulkTask<K,V,Void> {
4889	>	final Fun<? super V, ? extends U> transformer;
4890	>	final Action<? super U> action;
4891	>	ForEachTransformedValueTask
4892	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4893	>	Fun<? super V, ? extends U> transformer, Action<? super U> action) {
4894	>	super(p, b, i, f, t);
4895	>	this.transformer = transformer; this.action = action;
4896	>	}
4897	>	public final void compute() {
4898	>	final Fun<? super V, ? extends U> transformer;
4899	>	final Action<? super U> action;
4900	>	if ((transformer = this.transformer) != null &&
4901	>	(action = this.action) != null) {
4902	>	for (int i = baseIndex, f, h; batch > 0 &&
4903	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4904	>	addToPendingCount(1);
4905	>	new ForEachTransformedValueTask<K,V,U>
4906	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4907	>	transformer, action).fork();
4908	>	}
4909	>	for (Node<K,V> p; (p = advance()) != null; ) {
4910	>	U u;
4911	>	if ((u = transformer.apply(p.val)) != null)
4912	>	action.apply(u);
4913	>	}
4914	>	propagateCompletion();
4915	>	}
4916	>	}
4917	>	}
4918	>
4919	>	@SuppressWarnings("serial")
4920	>	static final class ForEachTransformedEntryTask<K,V,U>
4921	>	extends BulkTask<K,V,Void> {
4922	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
4923	>	final Action<? super U> action;
4924	>	ForEachTransformedEntryTask
4925	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4926	>	Fun<Map.Entry<K,V>, ? extends U> transformer, Action<? super U> action) {
4927	>	super(p, b, i, f, t);
4928	>	this.transformer = transformer; this.action = action;
4929	>	}
4930	>	public final void compute() {
4931	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
4932	>	final Action<? super U> action;
4933	>	if ((transformer = this.transformer) != null &&
4934	>	(action = this.action) != null) {
4935	>	for (int i = baseIndex, f, h; batch > 0 &&
4936	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4937	>	addToPendingCount(1);
4938	>	new ForEachTransformedEntryTask<K,V,U>
4939	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4940	>	transformer, action).fork();
4941	>	}
4942	>	for (Node<K,V> p; (p = advance()) != null; ) {
4943	>	U u;
4944	>	if ((u = transformer.apply(p)) != null)
4945	>	action.apply(u);
4946	>	}
4947	>	propagateCompletion();
4948	>	}
4949	>	}
4950	>	}
4951	>
4952	>	@SuppressWarnings("serial")
4953	>	static final class ForEachTransformedMappingTask<K,V,U>
4954	>	extends BulkTask<K,V,Void> {
4955	>	final BiFun<? super K, ? super V, ? extends U> transformer;
4956	>	final Action<? super U> action;
4957	>	ForEachTransformedMappingTask
4958	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4959	>	BiFun<? super K, ? super V, ? extends U> transformer,
4960	>	Action<? super U> action) {
4961	>	super(p, b, i, f, t);
4962	>	this.transformer = transformer; this.action = action;
4963	>	}
4964	>	public final void compute() {
4965	>	final BiFun<? super K, ? super V, ? extends U> transformer;
4966	>	final Action<? super U> action;
4967	>	if ((transformer = this.transformer) != null &&
4968	>	(action = this.action) != null) {
4969	>	for (int i = baseIndex, f, h; batch > 0 &&
4970	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
4971	>	addToPendingCount(1);
4972	>	new ForEachTransformedMappingTask<K,V,U>
4973	>	(this, batch >>>= 1, baseLimit = h, f, tab,
4974	>	transformer, action).fork();
4975	>	}
4976	>	for (Node<K,V> p; (p = advance()) != null; ) {
4977	>	U u;
4978	>	if ((u = transformer.apply(p.key, p.val)) != null)
4979	>	action.apply(u);
4980	>	}
4981	>	propagateCompletion();
4982	>	}
4983	>	}
4984	>	}
4985	>
4986	>	@SuppressWarnings("serial")
4987	>	static final class SearchKeysTask<K,V,U>
4988	>	extends BulkTask<K,V,U> {
4989	>	final Fun<? super K, ? extends U> searchFunction;
4990	>	final AtomicReference<U> result;
4991	>	SearchKeysTask
4992	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
4993	>	Fun<? super K, ? extends U> searchFunction,
4994	>	AtomicReference<U> result) {
4995	>	super(p, b, i, f, t);
4996	>	this.searchFunction = searchFunction; this.result = result;
4997	>	}
4998	>	public final U getRawResult() { return result.get(); }
4999	>	public final void compute() {
5000	>	final Fun<? super K, ? extends U> searchFunction;
5001	>	final AtomicReference<U> result;
5002	>	if ((searchFunction = this.searchFunction) != null &&
5003	>	(result = this.result) != null) {
5004	>	for (int i = baseIndex, f, h; batch > 0 &&
5005	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5006	>	if (result.get() != null)
5007	>	return;
5008	>	addToPendingCount(1);
5009	>	new SearchKeysTask<K,V,U>
5010	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5011	>	searchFunction, result).fork();
5012	>	}
5013	>	while (result.get() == null) {
5014	>	U u;
5015	>	Node<K,V> p;
5016	>	if ((p = advance()) == null) {
5017	>	propagateCompletion();
5018	>	break;
5019	>	}
5020	>	if ((u = searchFunction.apply(p.key)) != null) {
5021	>	if (result.compareAndSet(null, u))
5022	>	quietlyCompleteRoot();
5023	>	break;
5024	>	}
5025	>	}
5026	>	}
5027		}
3221	–	s.writeObject(null);
3222	–	s.writeObject(null);
3223	–	segments = null; // throw away
5028		}
5029
5030	<	/**
5031	<	* Reconstitutes the instance from a stream (that is, deserializes it).
5032	<	* @param s the stream
5033	<	*/
5034	<	@SuppressWarnings("unchecked")
5035	<	private void readObject(java.io.ObjectInputStream s)
5036	<	throws java.io.IOException, ClassNotFoundException {
5037	<	s.defaultReadObject();
5038	<	this.segments = null; // unneeded
5039	<	// initialize transient final field
5040	<	UNSAFE.putObjectVolatile(this, counterOffset, new LongAdder());
5030	>	@SuppressWarnings("serial")
5031	>	static final class SearchValuesTask<K,V,U>
5032	>	extends BulkTask<K,V,U> {
5033	>	final Fun<? super V, ? extends U> searchFunction;
5034	>	final AtomicReference<U> result;
5035	>	SearchValuesTask
5036	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5037	>	Fun<? super V, ? extends U> searchFunction,
5038	>	AtomicReference<U> result) {
5039	>	super(p, b, i, f, t);
5040	>	this.searchFunction = searchFunction; this.result = result;
5041	>	}
5042	>	public final U getRawResult() { return result.get(); }
5043	>	public final void compute() {
5044	>	final Fun<? super V, ? extends U> searchFunction;
5045	>	final AtomicReference<U> result;
5046	>	if ((searchFunction = this.searchFunction) != null &&
5047	>	(result = this.result) != null) {
5048	>	for (int i = baseIndex, f, h; batch > 0 &&
5049	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5050	>	if (result.get() != null)
5051	>	return;
5052	>	addToPendingCount(1);
5053	>	new SearchValuesTask<K,V,U>
5054	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5055	>	searchFunction, result).fork();
5056	>	}
5057	>	while (result.get() == null) {
5058	>	U u;
5059	>	Node<K,V> p;
5060	>	if ((p = advance()) == null) {
5061	>	propagateCompletion();
5062	>	break;
5063	>	}
5064	>	if ((u = searchFunction.apply(p.val)) != null) {
5065	>	if (result.compareAndSet(null, u))
5066	>	quietlyCompleteRoot();
5067	>	break;
5068	>	}
5069	>	}
5070	>	}
5071	>	}
5072	>	}
5073
5074	<	// Create all nodes, then place in table once size is known
5075	<	long size = 0L;
5076	<	Node p = null;
5077	<	for (;;) {
5078	<	K k = (K) s.readObject();
5079	<	V v = (V) s.readObject();
5080	<	if (k != null && v != null) {
5081	<	int h = spread(k.hashCode());
5082	<	p = new Node(h, k, v, p);
5083	<	++size;
5074	>	@SuppressWarnings("serial")
5075	>	static final class SearchEntriesTask<K,V,U>
5076	>	extends BulkTask<K,V,U> {
5077	>	final Fun<Entry<K,V>, ? extends U> searchFunction;
5078	>	final AtomicReference<U> result;
5079	>	SearchEntriesTask
5080	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5081	>	Fun<Entry<K,V>, ? extends U> searchFunction,
5082	>	AtomicReference<U> result) {
5083	>	super(p, b, i, f, t);
5084	>	this.searchFunction = searchFunction; this.result = result;
5085	>	}
5086	>	public final U getRawResult() { return result.get(); }
5087	>	public final void compute() {
5088	>	final Fun<Entry<K,V>, ? extends U> searchFunction;
5089	>	final AtomicReference<U> result;
5090	>	if ((searchFunction = this.searchFunction) != null &&
5091	>	(result = this.result) != null) {
5092	>	for (int i = baseIndex, f, h; batch > 0 &&
5093	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5094	>	if (result.get() != null)
5095	>	return;
5096	>	addToPendingCount(1);
5097	>	new SearchEntriesTask<K,V,U>
5098	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5099	>	searchFunction, result).fork();
5100	>	}
5101	>	while (result.get() == null) {
5102	>	U u;
5103	>	Node<K,V> p;
5104	>	if ((p = advance()) == null) {
5105	>	propagateCompletion();
5106	>	break;
5107	>	}
5108	>	if ((u = searchFunction.apply(p)) != null) {
5109	>	if (result.compareAndSet(null, u))
5110	>	quietlyCompleteRoot();
5111	>	return;
5112	>	}
5113	>	}
5114		}
3249	–	else
3250	–	break;
5115		}
5116	<	if (p != null) {
5117	<	boolean init = false;
5118	<	int n;
5119	<	if (size >= (long)(MAXIMUM_CAPACITY >>> 1))
5120	<	n = MAXIMUM_CAPACITY;
5121	<	else {
5122	<	int sz = (int)size;
5123	<	n = tableSizeFor(sz + (sz >>> 1) + 1);
5116	>	}
5117	>
5118	>	@SuppressWarnings("serial")
5119	>	static final class SearchMappingsTask<K,V,U>
5120	>	extends BulkTask<K,V,U> {
5121	>	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5122	>	final AtomicReference<U> result;
5123	>	SearchMappingsTask
5124	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5125	>	BiFun<? super K, ? super V, ? extends U> searchFunction,
5126	>	AtomicReference<U> result) {
5127	>	super(p, b, i, f, t);
5128	>	this.searchFunction = searchFunction; this.result = result;
5129	>	}
5130	>	public final U getRawResult() { return result.get(); }
5131	>	public final void compute() {
5132	>	final BiFun<? super K, ? super V, ? extends U> searchFunction;
5133	>	final AtomicReference<U> result;
5134	>	if ((searchFunction = this.searchFunction) != null &&
5135	>	(result = this.result) != null) {
5136	>	for (int i = baseIndex, f, h; batch > 0 &&
5137	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5138	>	if (result.get() != null)
5139	>	return;
5140	>	addToPendingCount(1);
5141	>	new SearchMappingsTask<K,V,U>
5142	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5143	>	searchFunction, result).fork();
5144	>	}
5145	>	while (result.get() == null) {
5146	>	U u;
5147	>	Node<K,V> p;
5148	>	if ((p = advance()) == null) {
5149	>	propagateCompletion();
5150	>	break;
5151	>	}
5152	>	if ((u = searchFunction.apply(p.key, p.val)) != null) {
5153	>	if (result.compareAndSet(null, u))
5154	>	quietlyCompleteRoot();
5155	>	break;
5156	>	}
5157	>	}
5158		}
5159	<	int sc = sizeCtl;
5160	<	boolean collide = false;
5161	<	if (n > sc &&
5162	<	UNSAFE.compareAndSwapInt(this, sizeCtlOffset, sc, -1)) {
5163	<	try {
5164	<	if (table == null) {
5165	<	init = true;
5166	<	Node[] tab = new Node[n];
5167	<	int mask = n - 1;
5168	<	while (p != null) {
5169	<	int j = p.hash & mask;
5170	<	Node next = p.next;
5171	<	Node q = p.next = tabAt(tab, j);
5172	<	setTabAt(tab, j, p);
5173	<	if (!collide && q != null && q.hash == p.hash)
5174	<	collide = true;
5175	<	p = next;
5159	>	}
5160	>	}
5161	>
5162	>	@SuppressWarnings("serial")
5163	>	static final class ReduceKeysTask<K,V>
5164	>	extends BulkTask<K,V,K> {
5165	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5166	>	K result;
5167	>	ReduceKeysTask<K,V> rights, nextRight;
5168	>	ReduceKeysTask
5169	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5170	>	ReduceKeysTask<K,V> nextRight,
5171	>	BiFun<? super K, ? super K, ? extends K> reducer) {
5172	>	super(p, b, i, f, t); this.nextRight = nextRight;
5173	>	this.reducer = reducer;
5174	>	}
5175	>	public final K getRawResult() { return result; }
5176	>	public final void compute() {
5177	>	final BiFun<? super K, ? super K, ? extends K> reducer;
5178	>	if ((reducer = this.reducer) != null) {
5179	>	for (int i = baseIndex, f, h; batch > 0 &&
5180	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5181	>	addToPendingCount(1);
5182	>	(rights = new ReduceKeysTask<K,V>
5183	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5184	>	rights, reducer)).fork();
5185	>	}
5186	>	K r = null;
5187	>	for (Node<K,V> p; (p = advance()) != null; ) {
5188	>	K u = p.key;
5189	>	r = (r == null) ? u : u == null ? r : reducer.apply(r, u);
5190	>	}
5191	>	result = r;
5192	>	CountedCompleter<?> c;
5193	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5194	>	@SuppressWarnings("unchecked") ReduceKeysTask<K,V>
5195	>	t = (ReduceKeysTask<K,V>)c,
5196	>	s = t.rights;
5197	>	while (s != null) {
5198	>	K tr, sr;
5199	>	if ((sr = s.result) != null)
5200	>	t.result = (((tr = t.result) == null) ? sr :
5201	>	reducer.apply(tr, sr));
5202	>	s = t.rights = s.nextRight;
5203	>	}
5204	>	}
5205	>	}
5206	>	}
5207	>	}
5208	>
5209	>	@SuppressWarnings("serial")
5210	>	static final class ReduceValuesTask<K,V>
5211	>	extends BulkTask<K,V,V> {
5212	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5213	>	V result;
5214	>	ReduceValuesTask<K,V> rights, nextRight;
5215	>	ReduceValuesTask
5216	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5217	>	ReduceValuesTask<K,V> nextRight,
5218	>	BiFun<? super V, ? super V, ? extends V> reducer) {
5219	>	super(p, b, i, f, t); this.nextRight = nextRight;
5220	>	this.reducer = reducer;
5221	>	}
5222	>	public final V getRawResult() { return result; }
5223	>	public final void compute() {
5224	>	final BiFun<? super V, ? super V, ? extends V> reducer;
5225	>	if ((reducer = this.reducer) != null) {
5226	>	for (int i = baseIndex, f, h; batch > 0 &&
5227	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5228	>	addToPendingCount(1);
5229	>	(rights = new ReduceValuesTask<K,V>
5230	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5231	>	rights, reducer)).fork();
5232	>	}
5233	>	V r = null;
5234	>	for (Node<K,V> p; (p = advance()) != null; ) {
5235	>	V v = p.val;
5236	>	r = (r == null) ? v : reducer.apply(r, v);
5237	>	}
5238	>	result = r;
5239	>	CountedCompleter<?> c;
5240	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5241	>	@SuppressWarnings("unchecked") ReduceValuesTask<K,V>
5242	>	t = (ReduceValuesTask<K,V>)c,
5243	>	s = t.rights;
5244	>	while (s != null) {
5245	>	V tr, sr;
5246	>	if ((sr = s.result) != null)
5247	>	t.result = (((tr = t.result) == null) ? sr :
5248	>	reducer.apply(tr, sr));
5249	>	s = t.rights = s.nextRight;
5250	>	}
5251	>	}
5252	>	}
5253	>	}
5254	>	}
5255	>
5256	>	@SuppressWarnings("serial")
5257	>	static final class ReduceEntriesTask<K,V>
5258	>	extends BulkTask<K,V,Map.Entry<K,V>> {
5259	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5260	>	Map.Entry<K,V> result;
5261	>	ReduceEntriesTask<K,V> rights, nextRight;
5262	>	ReduceEntriesTask
5263	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5264	>	ReduceEntriesTask<K,V> nextRight,
5265	>	BiFun<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) {
5266	>	super(p, b, i, f, t); this.nextRight = nextRight;
5267	>	this.reducer = reducer;
5268	>	}
5269	>	public final Map.Entry<K,V> getRawResult() { return result; }
5270	>	public final void compute() {
5271	>	final BiFun<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer;
5272	>	if ((reducer = this.reducer) != null) {
5273	>	for (int i = baseIndex, f, h; batch > 0 &&
5274	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5275	>	addToPendingCount(1);
5276	>	(rights = new ReduceEntriesTask<K,V>
5277	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5278	>	rights, reducer)).fork();
5279	>	}
5280	>	Map.Entry<K,V> r = null;
5281	>	for (Node<K,V> p; (p = advance()) != null; )
5282	>	r = (r == null) ? p : reducer.apply(r, p);
5283	>	result = r;
5284	>	CountedCompleter<?> c;
5285	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5286	>	@SuppressWarnings("unchecked") ReduceEntriesTask<K,V>
5287	>	t = (ReduceEntriesTask<K,V>)c,
5288	>	s = t.rights;
5289	>	while (s != null) {
5290	>	Map.Entry<K,V> tr, sr;
5291	>	if ((sr = s.result) != null)
5292	>	t.result = (((tr = t.result) == null) ? sr :
5293	>	reducer.apply(tr, sr));
5294	>	s = t.rights = s.nextRight;
5295	>	}
5296	>	}
5297	>	}
5298	>	}
5299	>	}
5300	>
5301	>	@SuppressWarnings("serial")
5302	>	static final class MapReduceKeysTask<K,V,U>
5303	>	extends BulkTask<K,V,U> {
5304	>	final Fun<? super K, ? extends U> transformer;
5305	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5306	>	U result;
5307	>	MapReduceKeysTask<K,V,U> rights, nextRight;
5308	>	MapReduceKeysTask
5309	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5310	>	MapReduceKeysTask<K,V,U> nextRight,
5311	>	Fun<? super K, ? extends U> transformer,
5312	>	BiFun<? super U, ? super U, ? extends U> reducer) {
5313	>	super(p, b, i, f, t); this.nextRight = nextRight;
5314	>	this.transformer = transformer;
5315	>	this.reducer = reducer;
5316	>	}
5317	>	public final U getRawResult() { return result; }
5318	>	public final void compute() {
5319	>	final Fun<? super K, ? extends U> transformer;
5320	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5321	>	if ((transformer = this.transformer) != null &&
5322	>	(reducer = this.reducer) != null) {
5323	>	for (int i = baseIndex, f, h; batch > 0 &&
5324	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5325	>	addToPendingCount(1);
5326	>	(rights = new MapReduceKeysTask<K,V,U>
5327	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5328	>	rights, transformer, reducer)).fork();
5329	>	}
5330	>	U r = null;
5331	>	for (Node<K,V> p; (p = advance()) != null; ) {
5332	>	U u;
5333	>	if ((u = transformer.apply(p.key)) != null)
5334	>	r = (r == null) ? u : reducer.apply(r, u);
5335	>	}
5336	>	result = r;
5337	>	CountedCompleter<?> c;
5338	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5339	>	@SuppressWarnings("unchecked") MapReduceKeysTask<K,V,U>
5340	>	t = (MapReduceKeysTask<K,V,U>)c,
5341	>	s = t.rights;
5342	>	while (s != null) {
5343	>	U tr, sr;
5344	>	if ((sr = s.result) != null)
5345	>	t.result = (((tr = t.result) == null) ? sr :
5346	>	reducer.apply(tr, sr));
5347	>	s = t.rights = s.nextRight;
5348	>	}
5349	>	}
5350	>	}
5351	>	}
5352	>	}
5353	>
5354	>	@SuppressWarnings("serial")
5355	>	static final class MapReduceValuesTask<K,V,U>
5356	>	extends BulkTask<K,V,U> {
5357	>	final Fun<? super V, ? extends U> transformer;
5358	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5359	>	U result;
5360	>	MapReduceValuesTask<K,V,U> rights, nextRight;
5361	>	MapReduceValuesTask
5362	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5363	>	MapReduceValuesTask<K,V,U> nextRight,
5364	>	Fun<? super V, ? extends U> transformer,
5365	>	BiFun<? super U, ? super U, ? extends U> reducer) {
5366	>	super(p, b, i, f, t); this.nextRight = nextRight;
5367	>	this.transformer = transformer;
5368	>	this.reducer = reducer;
5369	>	}
5370	>	public final U getRawResult() { return result; }
5371	>	public final void compute() {
5372	>	final Fun<? super V, ? extends U> transformer;
5373	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5374	>	if ((transformer = this.transformer) != null &&
5375	>	(reducer = this.reducer) != null) {
5376	>	for (int i = baseIndex, f, h; batch > 0 &&
5377	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5378	>	addToPendingCount(1);
5379	>	(rights = new MapReduceValuesTask<K,V,U>
5380	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5381	>	rights, transformer, reducer)).fork();
5382	>	}
5383	>	U r = null;
5384	>	for (Node<K,V> p; (p = advance()) != null; ) {
5385	>	U u;
5386	>	if ((u = transformer.apply(p.val)) != null)
5387	>	r = (r == null) ? u : reducer.apply(r, u);
5388	>	}
5389	>	result = r;
5390	>	CountedCompleter<?> c;
5391	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5392	>	@SuppressWarnings("unchecked") MapReduceValuesTask<K,V,U>
5393	>	t = (MapReduceValuesTask<K,V,U>)c,
5394	>	s = t.rights;
5395	>	while (s != null) {
5396	>	U tr, sr;
5397	>	if ((sr = s.result) != null)
5398	>	t.result = (((tr = t.result) == null) ? sr :
5399	>	reducer.apply(tr, sr));
5400	>	s = t.rights = s.nextRight;
5401	>	}
5402	>	}
5403	>	}
5404	>	}
5405	>	}
5406	>
5407	>	@SuppressWarnings("serial")
5408	>	static final class MapReduceEntriesTask<K,V,U>
5409	>	extends BulkTask<K,V,U> {
5410	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5411	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5412	>	U result;
5413	>	MapReduceEntriesTask<K,V,U> rights, nextRight;
5414	>	MapReduceEntriesTask
5415	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5416	>	MapReduceEntriesTask<K,V,U> nextRight,
5417	>	Fun<Map.Entry<K,V>, ? extends U> transformer,
5418	>	BiFun<? super U, ? super U, ? extends U> reducer) {
5419	>	super(p, b, i, f, t); this.nextRight = nextRight;
5420	>	this.transformer = transformer;
5421	>	this.reducer = reducer;
5422	>	}
5423	>	public final U getRawResult() { return result; }
5424	>	public final void compute() {
5425	>	final Fun<Map.Entry<K,V>, ? extends U> transformer;
5426	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5427	>	if ((transformer = this.transformer) != null &&
5428	>	(reducer = this.reducer) != null) {
5429	>	for (int i = baseIndex, f, h; batch > 0 &&
5430	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5431	>	addToPendingCount(1);
5432	>	(rights = new MapReduceEntriesTask<K,V,U>
5433	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5434	>	rights, transformer, reducer)).fork();
5435	>	}
5436	>	U r = null;
5437	>	for (Node<K,V> p; (p = advance()) != null; ) {
5438	>	U u;
5439	>	if ((u = transformer.apply(p)) != null)
5440	>	r = (r == null) ? u : reducer.apply(r, u);
5441	>	}
5442	>	result = r;
5443	>	CountedCompleter<?> c;
5444	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5445	>	@SuppressWarnings("unchecked") MapReduceEntriesTask<K,V,U>
5446	>	t = (MapReduceEntriesTask<K,V,U>)c,
5447	>	s = t.rights;
5448	>	while (s != null) {
5449	>	U tr, sr;
5450	>	if ((sr = s.result) != null)
5451	>	t.result = (((tr = t.result) == null) ? sr :
5452	>	reducer.apply(tr, sr));
5453	>	s = t.rights = s.nextRight;
5454	>	}
5455	>	}
5456	>	}
5457	>	}
5458	>	}
5459	>
5460	>	@SuppressWarnings("serial")
5461	>	static final class MapReduceMappingsTask<K,V,U>
5462	>	extends BulkTask<K,V,U> {
5463	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5464	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5465	>	U result;
5466	>	MapReduceMappingsTask<K,V,U> rights, nextRight;
5467	>	MapReduceMappingsTask
5468	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5469	>	MapReduceMappingsTask<K,V,U> nextRight,
5470	>	BiFun<? super K, ? super V, ? extends U> transformer,
5471	>	BiFun<? super U, ? super U, ? extends U> reducer) {
5472	>	super(p, b, i, f, t); this.nextRight = nextRight;
5473	>	this.transformer = transformer;
5474	>	this.reducer = reducer;
5475	>	}
5476	>	public final U getRawResult() { return result; }
5477	>	public final void compute() {
5478	>	final BiFun<? super K, ? super V, ? extends U> transformer;
5479	>	final BiFun<? super U, ? super U, ? extends U> reducer;
5480	>	if ((transformer = this.transformer) != null &&
5481	>	(reducer = this.reducer) != null) {
5482	>	for (int i = baseIndex, f, h; batch > 0 &&
5483	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5484	>	addToPendingCount(1);
5485	>	(rights = new MapReduceMappingsTask<K,V,U>
5486	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5487	>	rights, transformer, reducer)).fork();
5488	>	}
5489	>	U r = null;
5490	>	for (Node<K,V> p; (p = advance()) != null; ) {
5491	>	U u;
5492	>	if ((u = transformer.apply(p.key, p.val)) != null)
5493	>	r = (r == null) ? u : reducer.apply(r, u);
5494	>	}
5495	>	result = r;
5496	>	CountedCompleter<?> c;
5497	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5498	>	@SuppressWarnings("unchecked") MapReduceMappingsTask<K,V,U>
5499	>	t = (MapReduceMappingsTask<K,V,U>)c,
5500	>	s = t.rights;
5501	>	while (s != null) {
5502	>	U tr, sr;
5503	>	if ((sr = s.result) != null)
5504	>	t.result = (((tr = t.result) == null) ? sr :
5505	>	reducer.apply(tr, sr));
5506	>	s = t.rights = s.nextRight;
5507	>	}
5508	>	}
5509	>	}
5510	>	}
5511	>	}
5512	>
5513	>	@SuppressWarnings("serial")
5514	>	static final class MapReduceKeysToDoubleTask<K,V>
5515	>	extends BulkTask<K,V,Double> {
5516	>	final ObjectToDouble<? super K> transformer;
5517	>	final DoubleByDoubleToDouble reducer;
5518	>	final double basis;
5519	>	double result;
5520	>	MapReduceKeysToDoubleTask<K,V> rights, nextRight;
5521	>	MapReduceKeysToDoubleTask
5522	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5523	>	MapReduceKeysToDoubleTask<K,V> nextRight,
5524	>	ObjectToDouble<? super K> transformer,
5525	>	double basis,
5526	>	DoubleByDoubleToDouble reducer) {
5527	>	super(p, b, i, f, t); this.nextRight = nextRight;
5528	>	this.transformer = transformer;
5529	>	this.basis = basis; this.reducer = reducer;
5530	>	}
5531	>	public final Double getRawResult() { return result; }
5532	>	public final void compute() {
5533	>	final ObjectToDouble<? super K> transformer;
5534	>	final DoubleByDoubleToDouble reducer;
5535	>	if ((transformer = this.transformer) != null &&
5536	>	(reducer = this.reducer) != null) {
5537	>	double r = this.basis;
5538	>	for (int i = baseIndex, f, h; batch > 0 &&
5539	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5540	>	addToPendingCount(1);
5541	>	(rights = new MapReduceKeysToDoubleTask<K,V>
5542	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5543	>	rights, transformer, r, reducer)).fork();
5544	>	}
5545	>	for (Node<K,V> p; (p = advance()) != null; )
5546	>	r = reducer.apply(r, transformer.apply(p.key));
5547	>	result = r;
5548	>	CountedCompleter<?> c;
5549	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5550	>	@SuppressWarnings("unchecked") MapReduceKeysToDoubleTask<K,V>
5551	>	t = (MapReduceKeysToDoubleTask<K,V>)c,
5552	>	s = t.rights;
5553	>	while (s != null) {
5554	>	t.result = reducer.apply(t.result, s.result);
5555	>	s = t.rights = s.nextRight;
5556	>	}
5557	>	}
5558	>	}
5559	>	}
5560	>	}
5561	>
5562	>	@SuppressWarnings("serial")
5563	>	static final class MapReduceValuesToDoubleTask<K,V>
5564	>	extends BulkTask<K,V,Double> {
5565	>	final ObjectToDouble<? super V> transformer;
5566	>	final DoubleByDoubleToDouble reducer;
5567	>	final double basis;
5568	>	double result;
5569	>	MapReduceValuesToDoubleTask<K,V> rights, nextRight;
5570	>	MapReduceValuesToDoubleTask
5571	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5572	>	MapReduceValuesToDoubleTask<K,V> nextRight,
5573	>	ObjectToDouble<? super V> transformer,
5574	>	double basis,
5575	>	DoubleByDoubleToDouble reducer) {
5576	>	super(p, b, i, f, t); this.nextRight = nextRight;
5577	>	this.transformer = transformer;
5578	>	this.basis = basis; this.reducer = reducer;
5579	>	}
5580	>	public final Double getRawResult() { return result; }
5581	>	public final void compute() {
5582	>	final ObjectToDouble<? super V> transformer;
5583	>	final DoubleByDoubleToDouble reducer;
5584	>	if ((transformer = this.transformer) != null &&
5585	>	(reducer = this.reducer) != null) {
5586	>	double r = this.basis;
5587	>	for (int i = baseIndex, f, h; batch > 0 &&
5588	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5589	>	addToPendingCount(1);
5590	>	(rights = new MapReduceValuesToDoubleTask<K,V>
5591	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5592	>	rights, transformer, r, reducer)).fork();
5593	>	}
5594	>	for (Node<K,V> p; (p = advance()) != null; )
5595	>	r = reducer.apply(r, transformer.apply(p.val));
5596	>	result = r;
5597	>	CountedCompleter<?> c;
5598	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5599	>	@SuppressWarnings("unchecked") MapReduceValuesToDoubleTask<K,V>
5600	>	t = (MapReduceValuesToDoubleTask<K,V>)c,
5601	>	s = t.rights;
5602	>	while (s != null) {
5603	>	t.result = reducer.apply(t.result, s.result);
5604	>	s = t.rights = s.nextRight;
5605	>	}
5606	>	}
5607	>	}
5608	>	}
5609	>	}
5610	>
5611	>	@SuppressWarnings("serial")
5612	>	static final class MapReduceEntriesToDoubleTask<K,V>
5613	>	extends BulkTask<K,V,Double> {
5614	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
5615	>	final DoubleByDoubleToDouble reducer;
5616	>	final double basis;
5617	>	double result;
5618	>	MapReduceEntriesToDoubleTask<K,V> rights, nextRight;
5619	>	MapReduceEntriesToDoubleTask
5620	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5621	>	MapReduceEntriesToDoubleTask<K,V> nextRight,
5622	>	ObjectToDouble<Map.Entry<K,V>> transformer,
5623	>	double basis,
5624	>	DoubleByDoubleToDouble reducer) {
5625	>	super(p, b, i, f, t); this.nextRight = nextRight;
5626	>	this.transformer = transformer;
5627	>	this.basis = basis; this.reducer = reducer;
5628	>	}
5629	>	public final Double getRawResult() { return result; }
5630	>	public final void compute() {
5631	>	final ObjectToDouble<Map.Entry<K,V>> transformer;
5632	>	final DoubleByDoubleToDouble reducer;
5633	>	if ((transformer = this.transformer) != null &&
5634	>	(reducer = this.reducer) != null) {
5635	>	double r = this.basis;
5636	>	for (int i = baseIndex, f, h; batch > 0 &&
5637	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5638	>	addToPendingCount(1);
5639	>	(rights = new MapReduceEntriesToDoubleTask<K,V>
5640	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5641	>	rights, transformer, r, reducer)).fork();
5642	>	}
5643	>	for (Node<K,V> p; (p = advance()) != null; )
5644	>	r = reducer.apply(r, transformer.apply(p));
5645	>	result = r;
5646	>	CountedCompleter<?> c;
5647	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5648	>	@SuppressWarnings("unchecked") MapReduceEntriesToDoubleTask<K,V>
5649	>	t = (MapReduceEntriesToDoubleTask<K,V>)c,
5650	>	s = t.rights;
5651	>	while (s != null) {
5652	>	t.result = reducer.apply(t.result, s.result);
5653	>	s = t.rights = s.nextRight;
5654	>	}
5655	>	}
5656	>	}
5657	>	}
5658	>	}
5659	>
5660	>	@SuppressWarnings("serial")
5661	>	static final class MapReduceMappingsToDoubleTask<K,V>
5662	>	extends BulkTask<K,V,Double> {
5663	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5664	>	final DoubleByDoubleToDouble reducer;
5665	>	final double basis;
5666	>	double result;
5667	>	MapReduceMappingsToDoubleTask<K,V> rights, nextRight;
5668	>	MapReduceMappingsToDoubleTask
5669	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5670	>	MapReduceMappingsToDoubleTask<K,V> nextRight,
5671	>	ObjectByObjectToDouble<? super K, ? super V> transformer,
5672	>	double basis,
5673	>	DoubleByDoubleToDouble reducer) {
5674	>	super(p, b, i, f, t); this.nextRight = nextRight;
5675	>	this.transformer = transformer;
5676	>	this.basis = basis; this.reducer = reducer;
5677	>	}
5678	>	public final Double getRawResult() { return result; }
5679	>	public final void compute() {
5680	>	final ObjectByObjectToDouble<? super K, ? super V> transformer;
5681	>	final DoubleByDoubleToDouble reducer;
5682	>	if ((transformer = this.transformer) != null &&
5683	>	(reducer = this.reducer) != null) {
5684	>	double r = this.basis;
5685	>	for (int i = baseIndex, f, h; batch > 0 &&
5686	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5687	>	addToPendingCount(1);
5688	>	(rights = new MapReduceMappingsToDoubleTask<K,V>
5689	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5690	>	rights, transformer, r, reducer)).fork();
5691	>	}
5692	>	for (Node<K,V> p; (p = advance()) != null; )
5693	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5694	>	result = r;
5695	>	CountedCompleter<?> c;
5696	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5697	>	@SuppressWarnings("unchecked") MapReduceMappingsToDoubleTask<K,V>
5698	>	t = (MapReduceMappingsToDoubleTask<K,V>)c,
5699	>	s = t.rights;
5700	>	while (s != null) {
5701	>	t.result = reducer.apply(t.result, s.result);
5702	>	s = t.rights = s.nextRight;
5703	>	}
5704	>	}
5705	>	}
5706	>	}
5707	>	}
5708	>
5709	>	@SuppressWarnings("serial")
5710	>	static final class MapReduceKeysToLongTask<K,V>
5711	>	extends BulkTask<K,V,Long> {
5712	>	final ObjectToLong<? super K> transformer;
5713	>	final LongByLongToLong reducer;
5714	>	final long basis;
5715	>	long result;
5716	>	MapReduceKeysToLongTask<K,V> rights, nextRight;
5717	>	MapReduceKeysToLongTask
5718	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5719	>	MapReduceKeysToLongTask<K,V> nextRight,
5720	>	ObjectToLong<? super K> transformer,
5721	>	long basis,
5722	>	LongByLongToLong reducer) {
5723	>	super(p, b, i, f, t); this.nextRight = nextRight;
5724	>	this.transformer = transformer;
5725	>	this.basis = basis; this.reducer = reducer;
5726	>	}
5727	>	public final Long getRawResult() { return result; }
5728	>	public final void compute() {
5729	>	final ObjectToLong<? super K> transformer;
5730	>	final LongByLongToLong reducer;
5731	>	if ((transformer = this.transformer) != null &&
5732	>	(reducer = this.reducer) != null) {
5733	>	long r = this.basis;
5734	>	for (int i = baseIndex, f, h; batch > 0 &&
5735	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5736	>	addToPendingCount(1);
5737	>	(rights = new MapReduceKeysToLongTask<K,V>
5738	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5739	>	rights, transformer, r, reducer)).fork();
5740	>	}
5741	>	for (Node<K,V> p; (p = advance()) != null; )
5742	>	r = reducer.apply(r, transformer.apply(p.key));
5743	>	result = r;
5744	>	CountedCompleter<?> c;
5745	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5746	>	@SuppressWarnings("unchecked") MapReduceKeysToLongTask<K,V>
5747	>	t = (MapReduceKeysToLongTask<K,V>)c,
5748	>	s = t.rights;
5749	>	while (s != null) {
5750	>	t.result = reducer.apply(t.result, s.result);
5751	>	s = t.rights = s.nextRight;
5752	>	}
5753	>	}
5754	>	}
5755	>	}
5756	>	}
5757	>
5758	>	@SuppressWarnings("serial")
5759	>	static final class MapReduceValuesToLongTask<K,V>
5760	>	extends BulkTask<K,V,Long> {
5761	>	final ObjectToLong<? super V> transformer;
5762	>	final LongByLongToLong reducer;
5763	>	final long basis;
5764	>	long result;
5765	>	MapReduceValuesToLongTask<K,V> rights, nextRight;
5766	>	MapReduceValuesToLongTask
5767	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5768	>	MapReduceValuesToLongTask<K,V> nextRight,
5769	>	ObjectToLong<? super V> transformer,
5770	>	long basis,
5771	>	LongByLongToLong reducer) {
5772	>	super(p, b, i, f, t); this.nextRight = nextRight;
5773	>	this.transformer = transformer;
5774	>	this.basis = basis; this.reducer = reducer;
5775	>	}
5776	>	public final Long getRawResult() { return result; }
5777	>	public final void compute() {
5778	>	final ObjectToLong<? super V> transformer;
5779	>	final LongByLongToLong reducer;
5780	>	if ((transformer = this.transformer) != null &&
5781	>	(reducer = this.reducer) != null) {
5782	>	long r = this.basis;
5783	>	for (int i = baseIndex, f, h; batch > 0 &&
5784	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5785	>	addToPendingCount(1);
5786	>	(rights = new MapReduceValuesToLongTask<K,V>
5787	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5788	>	rights, transformer, r, reducer)).fork();
5789	>	}
5790	>	for (Node<K,V> p; (p = advance()) != null; )
5791	>	r = reducer.apply(r, transformer.apply(p.val));
5792	>	result = r;
5793	>	CountedCompleter<?> c;
5794	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5795	>	@SuppressWarnings("unchecked") MapReduceValuesToLongTask<K,V>
5796	>	t = (MapReduceValuesToLongTask<K,V>)c,
5797	>	s = t.rights;
5798	>	while (s != null) {
5799	>	t.result = reducer.apply(t.result, s.result);
5800	>	s = t.rights = s.nextRight;
5801	>	}
5802	>	}
5803	>	}
5804	>	}
5805	>	}
5806	>
5807	>	@SuppressWarnings("serial")
5808	>	static final class MapReduceEntriesToLongTask<K,V>
5809	>	extends BulkTask<K,V,Long> {
5810	>	final ObjectToLong<Map.Entry<K,V>> transformer;
5811	>	final LongByLongToLong reducer;
5812	>	final long basis;
5813	>	long result;
5814	>	MapReduceEntriesToLongTask<K,V> rights, nextRight;
5815	>	MapReduceEntriesToLongTask
5816	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5817	>	MapReduceEntriesToLongTask<K,V> nextRight,
5818	>	ObjectToLong<Map.Entry<K,V>> transformer,
5819	>	long basis,
5820	>	LongByLongToLong reducer) {
5821	>	super(p, b, i, f, t); this.nextRight = nextRight;
5822	>	this.transformer = transformer;
5823	>	this.basis = basis; this.reducer = reducer;
5824	>	}
5825	>	public final Long getRawResult() { return result; }
5826	>	public final void compute() {
5827	>	final ObjectToLong<Map.Entry<K,V>> transformer;
5828	>	final LongByLongToLong reducer;
5829	>	if ((transformer = this.transformer) != null &&
5830	>	(reducer = this.reducer) != null) {
5831	>	long r = this.basis;
5832	>	for (int i = baseIndex, f, h; batch > 0 &&
5833	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5834	>	addToPendingCount(1);
5835	>	(rights = new MapReduceEntriesToLongTask<K,V>
5836	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5837	>	rights, transformer, r, reducer)).fork();
5838	>	}
5839	>	for (Node<K,V> p; (p = advance()) != null; )
5840	>	r = reducer.apply(r, transformer.apply(p));
5841	>	result = r;
5842	>	CountedCompleter<?> c;
5843	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5844	>	@SuppressWarnings("unchecked") MapReduceEntriesToLongTask<K,V>
5845	>	t = (MapReduceEntriesToLongTask<K,V>)c,
5846	>	s = t.rights;
5847	>	while (s != null) {
5848	>	t.result = reducer.apply(t.result, s.result);
5849	>	s = t.rights = s.nextRight;
5850	>	}
5851	>	}
5852	>	}
5853	>	}
5854	>	}
5855	>
5856	>	@SuppressWarnings("serial")
5857	>	static final class MapReduceMappingsToLongTask<K,V>
5858	>	extends BulkTask<K,V,Long> {
5859	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
5860	>	final LongByLongToLong reducer;
5861	>	final long basis;
5862	>	long result;
5863	>	MapReduceMappingsToLongTask<K,V> rights, nextRight;
5864	>	MapReduceMappingsToLongTask
5865	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5866	>	MapReduceMappingsToLongTask<K,V> nextRight,
5867	>	ObjectByObjectToLong<? super K, ? super V> transformer,
5868	>	long basis,
5869	>	LongByLongToLong reducer) {
5870	>	super(p, b, i, f, t); this.nextRight = nextRight;
5871	>	this.transformer = transformer;
5872	>	this.basis = basis; this.reducer = reducer;
5873	>	}
5874	>	public final Long getRawResult() { return result; }
5875	>	public final void compute() {
5876	>	final ObjectByObjectToLong<? super K, ? super V> transformer;
5877	>	final LongByLongToLong reducer;
5878	>	if ((transformer = this.transformer) != null &&
5879	>	(reducer = this.reducer) != null) {
5880	>	long r = this.basis;
5881	>	for (int i = baseIndex, f, h; batch > 0 &&
5882	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5883	>	addToPendingCount(1);
5884	>	(rights = new MapReduceMappingsToLongTask<K,V>
5885	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5886	>	rights, transformer, r, reducer)).fork();
5887	>	}
5888	>	for (Node<K,V> p; (p = advance()) != null; )
5889	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
5890	>	result = r;
5891	>	CountedCompleter<?> c;
5892	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5893	>	@SuppressWarnings("unchecked") MapReduceMappingsToLongTask<K,V>
5894	>	t = (MapReduceMappingsToLongTask<K,V>)c,
5895	>	s = t.rights;
5896	>	while (s != null) {
5897	>	t.result = reducer.apply(t.result, s.result);
5898	>	s = t.rights = s.nextRight;
5899	>	}
5900	>	}
5901	>	}
5902	>	}
5903	>	}
5904	>
5905	>	@SuppressWarnings("serial")
5906	>	static final class MapReduceKeysToIntTask<K,V>
5907	>	extends BulkTask<K,V,Integer> {
5908	>	final ObjectToInt<? super K> transformer;
5909	>	final IntByIntToInt reducer;
5910	>	final int basis;
5911	>	int result;
5912	>	MapReduceKeysToIntTask<K,V> rights, nextRight;
5913	>	MapReduceKeysToIntTask
5914	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5915	>	MapReduceKeysToIntTask<K,V> nextRight,
5916	>	ObjectToInt<? super K> transformer,
5917	>	int basis,
5918	>	IntByIntToInt reducer) {
5919	>	super(p, b, i, f, t); this.nextRight = nextRight;
5920	>	this.transformer = transformer;
5921	>	this.basis = basis; this.reducer = reducer;
5922	>	}
5923	>	public final Integer getRawResult() { return result; }
5924	>	public final void compute() {
5925	>	final ObjectToInt<? super K> transformer;
5926	>	final IntByIntToInt reducer;
5927	>	if ((transformer = this.transformer) != null &&
5928	>	(reducer = this.reducer) != null) {
5929	>	int r = this.basis;
5930	>	for (int i = baseIndex, f, h; batch > 0 &&
5931	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5932	>	addToPendingCount(1);
5933	>	(rights = new MapReduceKeysToIntTask<K,V>
5934	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5935	>	rights, transformer, r, reducer)).fork();
5936	>	}
5937	>	for (Node<K,V> p; (p = advance()) != null; )
5938	>	r = reducer.apply(r, transformer.apply(p.key));
5939	>	result = r;
5940	>	CountedCompleter<?> c;
5941	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5942	>	@SuppressWarnings("unchecked") MapReduceKeysToIntTask<K,V>
5943	>	t = (MapReduceKeysToIntTask<K,V>)c,
5944	>	s = t.rights;
5945	>	while (s != null) {
5946	>	t.result = reducer.apply(t.result, s.result);
5947	>	s = t.rights = s.nextRight;
5948	>	}
5949	>	}
5950	>	}
5951	>	}
5952	>	}
5953	>
5954	>	@SuppressWarnings("serial")
5955	>	static final class MapReduceValuesToIntTask<K,V>
5956	>	extends BulkTask<K,V,Integer> {
5957	>	final ObjectToInt<? super V> transformer;
5958	>	final IntByIntToInt reducer;
5959	>	final int basis;
5960	>	int result;
5961	>	MapReduceValuesToIntTask<K,V> rights, nextRight;
5962	>	MapReduceValuesToIntTask
5963	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
5964	>	MapReduceValuesToIntTask<K,V> nextRight,
5965	>	ObjectToInt<? super V> transformer,
5966	>	int basis,
5967	>	IntByIntToInt reducer) {
5968	>	super(p, b, i, f, t); this.nextRight = nextRight;
5969	>	this.transformer = transformer;
5970	>	this.basis = basis; this.reducer = reducer;
5971	>	}
5972	>	public final Integer getRawResult() { return result; }
5973	>	public final void compute() {
5974	>	final ObjectToInt<? super V> transformer;
5975	>	final IntByIntToInt reducer;
5976	>	if ((transformer = this.transformer) != null &&
5977	>	(reducer = this.reducer) != null) {
5978	>	int r = this.basis;
5979	>	for (int i = baseIndex, f, h; batch > 0 &&
5980	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
5981	>	addToPendingCount(1);
5982	>	(rights = new MapReduceValuesToIntTask<K,V>
5983	>	(this, batch >>>= 1, baseLimit = h, f, tab,
5984	>	rights, transformer, r, reducer)).fork();
5985	>	}
5986	>	for (Node<K,V> p; (p = advance()) != null; )
5987	>	r = reducer.apply(r, transformer.apply(p.val));
5988	>	result = r;
5989	>	CountedCompleter<?> c;
5990	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
5991	>	@SuppressWarnings("unchecked") MapReduceValuesToIntTask<K,V>
5992	>	t = (MapReduceValuesToIntTask<K,V>)c,
5993	>	s = t.rights;
5994	>	while (s != null) {
5995	>	t.result = reducer.apply(t.result, s.result);
5996	>	s = t.rights = s.nextRight;
5997	>	}
5998	>	}
5999	>	}
6000	>	}
6001	>	}
6002	>
6003	>	@SuppressWarnings("serial")
6004	>	static final class MapReduceEntriesToIntTask<K,V>
6005	>	extends BulkTask<K,V,Integer> {
6006	>	final ObjectToInt<Map.Entry<K,V>> transformer;
6007	>	final IntByIntToInt reducer;
6008	>	final int basis;
6009	>	int result;
6010	>	MapReduceEntriesToIntTask<K,V> rights, nextRight;
6011	>	MapReduceEntriesToIntTask
6012	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6013	>	MapReduceEntriesToIntTask<K,V> nextRight,
6014	>	ObjectToInt<Map.Entry<K,V>> transformer,
6015	>	int basis,
6016	>	IntByIntToInt reducer) {
6017	>	super(p, b, i, f, t); this.nextRight = nextRight;
6018	>	this.transformer = transformer;
6019	>	this.basis = basis; this.reducer = reducer;
6020	>	}
6021	>	public final Integer getRawResult() { return result; }
6022	>	public final void compute() {
6023	>	final ObjectToInt<Map.Entry<K,V>> transformer;
6024	>	final IntByIntToInt reducer;
6025	>	if ((transformer = this.transformer) != null &&
6026	>	(reducer = this.reducer) != null) {
6027	>	int r = this.basis;
6028	>	for (int i = baseIndex, f, h; batch > 0 &&
6029	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6030	>	addToPendingCount(1);
6031	>	(rights = new MapReduceEntriesToIntTask<K,V>
6032	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6033	>	rights, transformer, r, reducer)).fork();
6034	>	}
6035	>	for (Node<K,V> p; (p = advance()) != null; )
6036	>	r = reducer.apply(r, transformer.apply(p));
6037	>	result = r;
6038	>	CountedCompleter<?> c;
6039	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6040	>	@SuppressWarnings("unchecked") MapReduceEntriesToIntTask<K,V>
6041	>	t = (MapReduceEntriesToIntTask<K,V>)c,
6042	>	s = t.rights;
6043	>	while (s != null) {
6044	>	t.result = reducer.apply(t.result, s.result);
6045	>	s = t.rights = s.nextRight;
6046	>	}
6047	>	}
6048	>	}
6049	>	}
6050	>	}
6051	>
6052	>	@SuppressWarnings("serial")
6053	>	static final class MapReduceMappingsToIntTask<K,V>
6054	>	extends BulkTask<K,V,Integer> {
6055	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
6056	>	final IntByIntToInt reducer;
6057	>	final int basis;
6058	>	int result;
6059	>	MapReduceMappingsToIntTask<K,V> rights, nextRight;
6060	>	MapReduceMappingsToIntTask
6061	>	(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t,
6062	>	MapReduceMappingsToIntTask<K,V> nextRight,
6063	>	ObjectByObjectToInt<? super K, ? super V> transformer,
6064	>	int basis,
6065	>	IntByIntToInt reducer) {
6066	>	super(p, b, i, f, t); this.nextRight = nextRight;
6067	>	this.transformer = transformer;
6068	>	this.basis = basis; this.reducer = reducer;
6069	>	}
6070	>	public final Integer getRawResult() { return result; }
6071	>	public final void compute() {
6072	>	final ObjectByObjectToInt<? super K, ? super V> transformer;
6073	>	final IntByIntToInt reducer;
6074	>	if ((transformer = this.transformer) != null &&
6075	>	(reducer = this.reducer) != null) {
6076	>	int r = this.basis;
6077	>	for (int i = baseIndex, f, h; batch > 0 &&
6078	>	(h = ((f = baseLimit) + i) >>> 1) > i;) {
6079	>	addToPendingCount(1);
6080	>	(rights = new MapReduceMappingsToIntTask<K,V>
6081	>	(this, batch >>>= 1, baseLimit = h, f, tab,
6082	>	rights, transformer, r, reducer)).fork();
6083	>	}
6084	>	for (Node<K,V> p; (p = advance()) != null; )
6085	>	r = reducer.apply(r, transformer.apply(p.key, p.val));
6086	>	result = r;
6087	>	CountedCompleter<?> c;
6088	>	for (c = firstComplete(); c != null; c = c.nextComplete()) {
6089	>	@SuppressWarnings("unchecked") MapReduceMappingsToIntTask<K,V>
6090	>	t = (MapReduceMappingsToIntTask<K,V>)c,
6091	>	s = t.rights;
6092	>	while (s != null) {
6093	>	t.result = reducer.apply(t.result, s.result);
6094	>	s = t.rights = s.nextRight;
6095	>	}
6096	>	}
6097	>	}
6098	>	}
6099	>	}
6100	>
6101	>	/* ---------------- Counters -------------- */
6102	>
6103	>	// Adapted from LongAdder and Striped64.
6104	>	// See their internal docs for explanation.
6105	>
6106	>	// A padded cell for distributing counts
6107	>	static final class CounterCell {
6108	>	volatile long p0, p1, p2, p3, p4, p5, p6;
6109	>	volatile long value;
6110	>	volatile long q0, q1, q2, q3, q4, q5, q6;
6111	>	CounterCell(long x) { value = x; }
6112	>	}
6113	>
6114	>	/**
6115	>	* Holder for the thread-local hash code determining which
6116	>	* CounterCell to use. The code is initialized via the
6117	>	* counterHashCodeGenerator, but may be moved upon collisions.
6118	>	*/
6119	>	static final class CounterHashCode {
6120	>	int code;
6121	>	}
6122	>
6123	>	/**
6124	>	* Generates initial value for per-thread CounterHashCodes.
6125	>	*/
6126	>	static final AtomicInteger counterHashCodeGenerator = new AtomicInteger();
6127	>
6128	>	/**
6129	>	* Increment for counterHashCodeGenerator. See class ThreadLocal
6130	>	* for explanation.
6131	>	*/
6132	>	static final int SEED_INCREMENT = 0x61c88647;
6133	>
6134	>	/**
6135	>	* Per-thread counter hash codes. Shared across all instances.
6136	>	*/
6137	>	static final ThreadLocal<CounterHashCode> threadCounterHashCode =
6138	>	new ThreadLocal<CounterHashCode>();
6139	>
6140	>
6141	>	final long sumCount() {
6142	>	CounterCell[] as = counterCells; CounterCell a;
6143	>	long sum = baseCount;
6144	>	if (as != null) {
6145	>	for (int i = 0; i < as.length; ++i) {
6146	>	if ((a = as[i]) != null)
6147	>	sum += a.value;
6148	>	}
6149	>	}
6150	>	return sum;
6151	>	}
6152	>
6153	>	// See LongAdder version for explanation
6154	>	private final void fullAddCount(long x, CounterHashCode hc,
6155	>	boolean wasUncontended) {
6156	>	int h;
6157	>	if (hc == null) {
6158	>	hc = new CounterHashCode();
6159	>	int s = counterHashCodeGenerator.addAndGet(SEED_INCREMENT);
6160	>	h = hc.code = (s == 0) ? 1 : s; // Avoid zero
6161	>	threadCounterHashCode.set(hc);
6162	>	}
6163	>	else
6164	>	h = hc.code;
6165	>	boolean collide = false;                // True if last slot nonempty
6166	>	for (;;) {
6167	>	CounterCell[] as; CounterCell a; int n; long v;
6168	>	if ((as = counterCells) != null && (n = as.length) > 0) {
6169	>	if ((a = as[(n - 1) & h]) == null) {
6170	>	if (cellsBusy == 0) {            // Try to attach new Cell
6171	>	CounterCell r = new CounterCell(x); // Optimistic create
6172	>	if (cellsBusy == 0 &&
6173	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6174	>	boolean created = false;
6175	>	try {               // Recheck under lock
6176	>	CounterCell[] rs; int m, j;
6177	>	if ((rs = counterCells) != null &&
6178	>	(m = rs.length) > 0 &&
6179	>	rs[j = (m - 1) & h] == null) {
6180	>	rs[j] = r;
6181	>	created = true;
6182	>	}
6183	>	} finally {
6184	>	cellsBusy = 0;
6185	>	}
6186	>	if (created)
6187	>	break;
6188	>	continue;           // Slot is now non-empty
6189		}
3279	–	table = tab;
3280	–	counter.add(size);
3281	–	sc = n - (n >>> 2);
6190		}
6191	<	} finally {
3284	<	sizeCtl = sc;
6191	>	collide = false;
6192		}
6193	<	if (collide) { // rescan and convert to TreeBins
6194	<	Node[] tab = table;
6195	<	for (int i = 0; i < tab.length; ++i) {
6196	<	int c = 0;
6197	<	for (Node e = tabAt(tab, i); e != null; e = e.next) {
6198	<	if (++c > TREE_THRESHOLD &&
6199	<	(e.key instanceof Comparable)) {
6200	<	replaceWithTreeBin(tab, i, e.key);
6201	<	break;
6202	<	}
6193	>	else if (!wasUncontended)       // CAS already known to fail
6194	>	wasUncontended = true;      // Continue after rehash
6195	>	else if (U.compareAndSwapLong(a, CELLVALUE, v = a.value, v + x))
6196	>	break;
6197	>	else if (counterCells != as || n >= NCPU)
6198	>	collide = false;            // At max size or stale
6199	>	else if (!collide)
6200	>	collide = true;
6201	>	else if (cellsBusy == 0 &&
6202	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6203	>	try {
6204	>	if (counterCells == as) {// Expand table unless stale
6205	>	CounterCell[] rs = new CounterCell[n << 1];
6206	>	for (int i = 0; i < n; ++i)
6207	>	rs[i] = as[i];
6208	>	counterCells = rs;
6209		}
6210	+	} finally {
6211	+	cellsBusy = 0;
6212		}
6213	+	collide = false;
6214	+	continue;                   // Retry with expanded table
6215		}
6216	<	}
6217	<	if (!init) { // Can only happen if unsafely published.
6218	<	while (p != null) {
6219	<	internalPut(p.key, p.val);
6220	<	p = p.next;
6216	>	h ^= h << 13;                   // Rehash
6217	>	h ^= h >>> 17;
6218	>	h ^= h << 5;
6219	>	}
6220	>	else if (cellsBusy == 0 && counterCells == as &&
6221	>	U.compareAndSwapInt(this, CELLSBUSY, 0, 1)) {
6222	>	boolean init = false;
6223	>	try {                           // Initialize table
6224	>	if (counterCells == as) {
6225	>	CounterCell[] rs = new CounterCell[2];
6226	>	rs[h & 1] = new CounterCell(x);
6227	>	counterCells = rs;
6228	>	init = true;
6229	>	}
6230	>	} finally {
6231	>	cellsBusy = 0;
6232		}
6233	+	if (init)
6234	+	break;
6235		}
6236	+	else if (U.compareAndSwapLong(this, BASECOUNT, v = baseCount, v + x))
6237	+	break;                          // Fall back on using base
6238		}
6239	+	hc.code = h;                            // Record index for next time
6240		}
6241
6242		// Unsafe mechanics
6243	<	private static final sun.misc.Unsafe UNSAFE;
6244	<	private static final long counterOffset;
6245	<	private static final long sizeCtlOffset;
6243	>	private static final sun.misc.Unsafe U;
6244	>	private static final long SIZECTL;
6245	>	private static final long TRANSFERINDEX;
6246	>	private static final long BASECOUNT;
6247	>	private static final long CELLSBUSY;
6248	>	private static final long CELLVALUE;
6249		private static final long ABASE;
6250		private static final int ASHIFT;
6251
6252		static {
3317	–	int ss;
6253		try {
6254	<	UNSAFE = getUnsafe();
6254	>	U = getUnsafe();
6255		Class<?> k = ConcurrentHashMapV8.class;
6256	<	counterOffset = UNSAFE.objectFieldOffset
3322	<	(k.getDeclaredField("counter"));
3323	<	sizeCtlOffset = UNSAFE.objectFieldOffset
6256	>	SIZECTL = U.objectFieldOffset
6257		(k.getDeclaredField("sizeCtl"));
6258	<	Class<?> sc = Node[].class;
6259	<	ABASE = UNSAFE.arrayBaseOffset(sc);
6260	<	ss = UNSAFE.arrayIndexScale(sc);
6258	>	TRANSFERINDEX = U.objectFieldOffset
6259	>	(k.getDeclaredField("transferIndex"));
6260	>	BASECOUNT = U.objectFieldOffset
6261	>	(k.getDeclaredField("baseCount"));
6262	>	CELLSBUSY = U.objectFieldOffset
6263	>	(k.getDeclaredField("cellsBusy"));
6264	>	Class<?> ck = CounterCell.class;
6265	>	CELLVALUE = U.objectFieldOffset
6266	>	(ck.getDeclaredField("value"));
6267	>	Class<?> ak = Node[].class;
6268	>	ABASE = U.arrayBaseOffset(ak);
6269	>	int scale = U.arrayIndexScale(ak);
6270	>	if ((scale & (scale - 1)) != 0)
6271	>	throw new Error("data type scale not a power of two");
6272	>	ASHIFT = 31 - Integer.numberOfLeadingZeros(scale);
6273		} catch (Exception e) {
6274		throw new Error(e);
6275		}
3331	–	if ((ss & (ss-1)) != 0)
3332	–	throw new Error("data type scale not a power of two");
3333	–	ASHIFT = 31 - Integer.numberOfLeadingZeros(ss);
6276		}
6277
6278		/**
#	Line 3343 | Line 6285 | public class ConcurrentHashMapV8<K, V>
6285		private static sun.misc.Unsafe getUnsafe() {
6286		try {
6287		return sun.misc.Unsafe.getUnsafe();
6288	<	} catch (SecurityException se) {
6289	<	try {
6290	<	return java.security.AccessController.doPrivileged
6291	<	(new java.security
6292	<	.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6293	<	public sun.misc.Unsafe run() throws Exception {
6294	<	java.lang.reflect.Field f = sun.misc
6295	<	.Unsafe.class.getDeclaredField("theUnsafe");
6296	<	f.setAccessible(true);
6297	<	return (sun.misc.Unsafe) f.get(null);
6298	<	}});
6299	<	} catch (java.security.PrivilegedActionException e) {
6300	<	throw new RuntimeException("Could not initialize intrinsics",
6301	<	e.getCause());
6302	<	}
6288	>	} catch (SecurityException tryReflectionInstead) {}
6289	>	try {
6290	>	return java.security.AccessController.doPrivileged
6291	>	(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() {
6292	>	public sun.misc.Unsafe run() throws Exception {
6293	>	Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
6294	>	for (java.lang.reflect.Field f : k.getDeclaredFields()) {
6295	>	f.setAccessible(true);
6296	>	Object x = f.get(null);
6297	>	if (k.isInstance(x))
6298	>	return k.cast(x);
6299	>	}
6300	>	throw new NoSuchFieldError("the Unsafe");
6301	>	}});
6302	>	} catch (java.security.PrivilegedActionException e) {
6303	>	throw new RuntimeException("Could not initialize intrinsics",
6304	>	e.getCause());
6305		}
6306		}
3363	–
6307		}

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