1 |
|
/* |
2 |
|
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
|
* Expert Group and released to the public domain, as explained at |
4 |
< |
* http://creativecommons.org/licenses/publicdomain |
4 |
> |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
|
*/ |
6 |
|
|
7 |
|
package java.util.concurrent; |
8 |
< |
import java.util.concurrent.locks.*; |
9 |
< |
import java.util.*; |
8 |
> |
|
9 |
> |
import java.io.ObjectStreamField; |
10 |
|
import java.io.Serializable; |
11 |
< |
import java.io.IOException; |
12 |
< |
import java.io.ObjectInputStream; |
13 |
< |
import java.io.ObjectOutputStream; |
11 |
> |
import java.lang.reflect.ParameterizedType; |
12 |
> |
import java.lang.reflect.Type; |
13 |
> |
import java.util.AbstractMap; |
14 |
> |
import java.util.Arrays; |
15 |
> |
import java.util.Collection; |
16 |
> |
import java.util.Enumeration; |
17 |
> |
import java.util.HashMap; |
18 |
> |
import java.util.Hashtable; |
19 |
> |
import java.util.Iterator; |
20 |
> |
import java.util.Map; |
21 |
> |
import java.util.NoSuchElementException; |
22 |
> |
import java.util.Set; |
23 |
> |
import java.util.Spliterator; |
24 |
> |
import java.util.concurrent.atomic.AtomicReference; |
25 |
> |
import java.util.concurrent.locks.LockSupport; |
26 |
> |
import java.util.concurrent.locks.ReentrantLock; |
27 |
> |
import java.util.function.BiConsumer; |
28 |
> |
import java.util.function.BiFunction; |
29 |
> |
import java.util.function.Consumer; |
30 |
> |
import java.util.function.DoubleBinaryOperator; |
31 |
> |
import java.util.function.Function; |
32 |
> |
import java.util.function.IntBinaryOperator; |
33 |
> |
import java.util.function.LongBinaryOperator; |
34 |
> |
import java.util.function.Predicate; |
35 |
> |
import java.util.function.ToDoubleBiFunction; |
36 |
> |
import java.util.function.ToDoubleFunction; |
37 |
> |
import java.util.function.ToIntBiFunction; |
38 |
> |
import java.util.function.ToIntFunction; |
39 |
> |
import java.util.function.ToLongBiFunction; |
40 |
> |
import java.util.function.ToLongFunction; |
41 |
> |
import java.util.stream.Stream; |
42 |
> |
import jdk.internal.misc.Unsafe; |
43 |
|
|
44 |
|
/** |
45 |
|
* A hash table supporting full concurrency of retrievals and |
46 |
< |
* adjustable expected concurrency for updates. This class obeys the |
46 |
> |
* high expected concurrency for updates. This class obeys the |
47 |
|
* same functional specification as {@link java.util.Hashtable}, and |
48 |
|
* includes versions of methods corresponding to each method of |
49 |
< |
* <tt>Hashtable</tt>. However, even though all operations are |
49 |
> |
* {@code Hashtable}. However, even though all operations are |
50 |
|
* thread-safe, retrieval operations do <em>not</em> entail locking, |
51 |
|
* and there is <em>not</em> any support for locking the entire table |
52 |
|
* in a way that prevents all access. This class is fully |
53 |
< |
* interoperable with <tt>Hashtable</tt> in programs that rely on its |
53 |
> |
* interoperable with {@code Hashtable} in programs that rely on its |
54 |
|
* thread safety but not on its synchronization details. |
55 |
|
* |
56 |
< |
* <p> Retrieval operations (including <tt>get</tt>) generally do not |
57 |
< |
* block, so may overlap with update operations (including |
58 |
< |
* <tt>put</tt> and <tt>remove</tt>). Retrievals reflect the results |
59 |
< |
* of the most recently <em>completed</em> update operations holding |
60 |
< |
* upon their onset. For aggregate operations such as <tt>putAll</tt> |
61 |
< |
* and <tt>clear</tt>, concurrent retrievals may reflect insertion or |
62 |
< |
* removal of only some entries. Similarly, Iterators and |
63 |
< |
* Enumerations return elements reflecting the state of the hash table |
64 |
< |
* at some point at or since the creation of the iterator/enumeration. |
65 |
< |
* They do <em>not</em> throw {@link ConcurrentModificationException}. |
56 |
> |
* <p>Retrieval operations (including {@code get}) generally do not |
57 |
> |
* block, so may overlap with update operations (including {@code put} |
58 |
> |
* and {@code remove}). Retrievals reflect the results of the most |
59 |
> |
* recently <em>completed</em> update operations holding upon their |
60 |
> |
* onset. (More formally, an update operation for a given key bears a |
61 |
> |
* <em>happens-before</em> relation with any (non-null) retrieval for |
62 |
> |
* that key reporting the updated value.) For aggregate operations |
63 |
> |
* such as {@code putAll} and {@code clear}, concurrent retrievals may |
64 |
> |
* reflect insertion or removal of only some entries. Similarly, |
65 |
> |
* Iterators, Spliterators and Enumerations return elements reflecting the |
66 |
> |
* state of the hash table at some point at or since the creation of the |
67 |
> |
* iterator/enumeration. They do <em>not</em> throw {@link |
68 |
> |
* java.util.ConcurrentModificationException ConcurrentModificationException}. |
69 |
|
* However, iterators are designed to be used by only one thread at a time. |
70 |
+ |
* Bear in mind that the results of aggregate status methods including |
71 |
+ |
* {@code size}, {@code isEmpty}, and {@code containsValue} are typically |
72 |
+ |
* useful only when a map is not undergoing concurrent updates in other threads. |
73 |
+ |
* Otherwise the results of these methods reflect transient states |
74 |
+ |
* that may be adequate for monitoring or estimation purposes, but not |
75 |
+ |
* for program control. |
76 |
+ |
* |
77 |
+ |
* <p>The table is dynamically expanded when there are too many |
78 |
+ |
* collisions (i.e., keys that have distinct hash codes but fall into |
79 |
+ |
* the same slot modulo the table size), with the expected average |
80 |
+ |
* effect of maintaining roughly two bins per mapping (corresponding |
81 |
+ |
* to a 0.75 load factor threshold for resizing). There may be much |
82 |
+ |
* variance around this average as mappings are added and removed, but |
83 |
+ |
* overall, this maintains a commonly accepted time/space tradeoff for |
84 |
+ |
* hash tables. However, resizing this or any other kind of hash |
85 |
+ |
* table may be a relatively slow operation. When possible, it is a |
86 |
+ |
* good idea to provide a size estimate as an optional {@code |
87 |
+ |
* initialCapacity} constructor argument. An additional optional |
88 |
+ |
* {@code loadFactor} constructor argument provides a further means of |
89 |
+ |
* customizing initial table capacity by specifying the table density |
90 |
+ |
* to be used in calculating the amount of space to allocate for the |
91 |
+ |
* given number of elements. Also, for compatibility with previous |
92 |
+ |
* versions of this class, constructors may optionally specify an |
93 |
+ |
* expected {@code concurrencyLevel} as an additional hint for |
94 |
+ |
* internal sizing. Note that using many keys with exactly the same |
95 |
+ |
* {@code hashCode()} is a sure way to slow down performance of any |
96 |
+ |
* hash table. To ameliorate impact, when keys are {@link Comparable}, |
97 |
+ |
* this class may use comparison order among keys to help break ties. |
98 |
+ |
* |
99 |
+ |
* <p>A {@link Set} projection of a ConcurrentHashMap may be created |
100 |
+ |
* (using {@link #newKeySet()} or {@link #newKeySet(int)}), or viewed |
101 |
+ |
* (using {@link #keySet(Object)} when only keys are of interest, and the |
102 |
+ |
* mapped values are (perhaps transiently) not used or all take the |
103 |
+ |
* same mapping value. |
104 |
|
* |
105 |
< |
* <p> The allowed concurrency among update operations is guided by |
106 |
< |
* the optional <tt>concurrencyLevel</tt> constructor argument |
107 |
< |
* (default <tt>16</tt>), which is used as a hint for internal sizing. The |
108 |
< |
* table is internally partitioned to try to permit the indicated |
109 |
< |
* number of concurrent updates without contention. Because placement |
110 |
< |
* in hash tables is essentially random, the actual concurrency will |
45 |
< |
* vary. Ideally, you should choose a value to accommodate as many |
46 |
< |
* threads as will ever concurrently modify the table. Using a |
47 |
< |
* significantly higher value than you need can waste space and time, |
48 |
< |
* and a significantly lower value can lead to thread contention. But |
49 |
< |
* overestimates and underestimates within an order of magnitude do |
50 |
< |
* not usually have much noticeable impact. A value of one is |
51 |
< |
* appropriate when it is known that only one thread will modify and |
52 |
< |
* all others will only read. Also, resizing this or any other kind of |
53 |
< |
* hash table is a relatively slow operation, so, when possible, it is |
54 |
< |
* a good idea to provide estimates of expected table sizes in |
55 |
< |
* constructors. |
105 |
> |
* <p>A ConcurrentHashMap can be used as a scalable frequency map (a |
106 |
> |
* form of histogram or multiset) by using {@link |
107 |
> |
* java.util.concurrent.atomic.LongAdder} values and initializing via |
108 |
> |
* {@link #computeIfAbsent computeIfAbsent}. For example, to add a count |
109 |
> |
* to a {@code ConcurrentHashMap<String,LongAdder> freqs}, you can use |
110 |
> |
* {@code freqs.computeIfAbsent(key, k -> new LongAdder()).increment();} |
111 |
|
* |
112 |
|
* <p>This class and its views and iterators implement all of the |
113 |
|
* <em>optional</em> methods of the {@link Map} and {@link Iterator} |
114 |
|
* interfaces. |
115 |
|
* |
116 |
< |
* <p> Like {@link Hashtable} but unlike {@link HashMap}, this class |
117 |
< |
* does <em>not</em> allow <tt>null</tt> to be used as a key or value. |
116 |
> |
* <p>Like {@link Hashtable} but unlike {@link HashMap}, this class |
117 |
> |
* does <em>not</em> allow {@code null} to be used as a key or value. |
118 |
> |
* |
119 |
> |
* <p>ConcurrentHashMaps support a set of sequential and parallel bulk |
120 |
> |
* operations that, unlike most {@link Stream} methods, are designed |
121 |
> |
* to be safely, and often sensibly, applied even with maps that are |
122 |
> |
* being concurrently updated by other threads; for example, when |
123 |
> |
* computing a snapshot summary of the values in a shared registry. |
124 |
> |
* There are three kinds of operation, each with four forms, accepting |
125 |
> |
* functions with keys, values, entries, and (key, value) pairs as |
126 |
> |
* arguments and/or return values. Because the elements of a |
127 |
> |
* ConcurrentHashMap are not ordered in any particular way, and may be |
128 |
> |
* processed in different orders in different parallel executions, the |
129 |
> |
* correctness of supplied functions should not depend on any |
130 |
> |
* ordering, or on any other objects or values that may transiently |
131 |
> |
* change while computation is in progress; and except for forEach |
132 |
> |
* actions, should ideally be side-effect-free. Bulk operations on |
133 |
> |
* {@link Map.Entry} objects do not support method {@code setValue}. |
134 |
> |
* |
135 |
> |
* <ul> |
136 |
> |
* <li>forEach: Performs a given action on each element. |
137 |
> |
* A variant form applies a given transformation on each element |
138 |
> |
* before performing the action. |
139 |
> |
* |
140 |
> |
* <li>search: Returns the first available non-null result of |
141 |
> |
* applying a given function on each element; skipping further |
142 |
> |
* search when a result is found. |
143 |
> |
* |
144 |
> |
* <li>reduce: Accumulates each element. The supplied reduction |
145 |
> |
* function cannot rely on ordering (more formally, it should be |
146 |
> |
* both associative and commutative). There are five variants: |
147 |
> |
* |
148 |
> |
* <ul> |
149 |
> |
* |
150 |
> |
* <li>Plain reductions. (There is not a form of this method for |
151 |
> |
* (key, value) function arguments since there is no corresponding |
152 |
> |
* return type.) |
153 |
> |
* |
154 |
> |
* <li>Mapped reductions that accumulate the results of a given |
155 |
> |
* function applied to each element. |
156 |
> |
* |
157 |
> |
* <li>Reductions to scalar doubles, longs, and ints, using a |
158 |
> |
* given basis value. |
159 |
> |
* |
160 |
> |
* </ul> |
161 |
> |
* </ul> |
162 |
> |
* |
163 |
> |
* <p>These bulk operations accept a {@code parallelismThreshold} |
164 |
> |
* argument. Methods proceed sequentially if the current map size is |
165 |
> |
* estimated to be less than the given threshold. Using a value of |
166 |
> |
* {@code Long.MAX_VALUE} suppresses all parallelism. Using a value |
167 |
> |
* of {@code 1} results in maximal parallelism by partitioning into |
168 |
> |
* enough subtasks to fully utilize the {@link |
169 |
> |
* ForkJoinPool#commonPool()} that is used for all parallel |
170 |
> |
* computations. Normally, you would initially choose one of these |
171 |
> |
* extreme values, and then measure performance of using in-between |
172 |
> |
* values that trade off overhead versus throughput. |
173 |
> |
* |
174 |
> |
* <p>The concurrency properties of bulk operations follow |
175 |
> |
* from those of ConcurrentHashMap: Any non-null result returned |
176 |
> |
* from {@code get(key)} and related access methods bears a |
177 |
> |
* happens-before relation with the associated insertion or |
178 |
> |
* update. The result of any bulk operation reflects the |
179 |
> |
* composition of these per-element relations (but is not |
180 |
> |
* necessarily atomic with respect to the map as a whole unless it |
181 |
> |
* is somehow known to be quiescent). Conversely, because keys |
182 |
> |
* and values in the map are never null, null serves as a reliable |
183 |
> |
* atomic indicator of the current lack of any result. To |
184 |
> |
* maintain this property, null serves as an implicit basis for |
185 |
> |
* all non-scalar reduction operations. For the double, long, and |
186 |
> |
* int versions, the basis should be one that, when combined with |
187 |
> |
* any other value, returns that other value (more formally, it |
188 |
> |
* should be the identity element for the reduction). Most common |
189 |
> |
* reductions have these properties; for example, computing a sum |
190 |
> |
* with basis 0 or a minimum with basis MAX_VALUE. |
191 |
> |
* |
192 |
> |
* <p>Search and transformation functions provided as arguments |
193 |
> |
* should similarly return null to indicate the lack of any result |
194 |
> |
* (in which case it is not used). In the case of mapped |
195 |
> |
* reductions, this also enables transformations to serve as |
196 |
> |
* filters, returning null (or, in the case of primitive |
197 |
> |
* specializations, the identity basis) if the element should not |
198 |
> |
* be combined. You can create compound transformations and |
199 |
> |
* filterings by composing them yourself under this "null means |
200 |
> |
* there is nothing there now" rule before using them in search or |
201 |
> |
* reduce operations. |
202 |
> |
* |
203 |
> |
* <p>Methods accepting and/or returning Entry arguments maintain |
204 |
> |
* key-value associations. They may be useful for example when |
205 |
> |
* finding the key for the greatest value. Note that "plain" Entry |
206 |
> |
* arguments can be supplied using {@code new |
207 |
> |
* AbstractMap.SimpleEntry(k,v)}. |
208 |
> |
* |
209 |
> |
* <p>Bulk operations may complete abruptly, throwing an |
210 |
> |
* exception encountered in the application of a supplied |
211 |
> |
* function. Bear in mind when handling such exceptions that other |
212 |
> |
* concurrently executing functions could also have thrown |
213 |
> |
* exceptions, or would have done so if the first exception had |
214 |
> |
* not occurred. |
215 |
> |
* |
216 |
> |
* <p>Speedups for parallel compared to sequential forms are common |
217 |
> |
* but not guaranteed. Parallel operations involving brief functions |
218 |
> |
* on small maps may execute more slowly than sequential forms if the |
219 |
> |
* underlying work to parallelize the computation is more expensive |
220 |
> |
* than the computation itself. Similarly, parallelization may not |
221 |
> |
* lead to much actual parallelism if all processors are busy |
222 |
> |
* performing unrelated tasks. |
223 |
> |
* |
224 |
> |
* <p>All arguments to all task methods must be non-null. |
225 |
|
* |
226 |
|
* <p>This class is a member of the |
227 |
< |
* <a href="{@docRoot}/../guide/collections/index.html"> |
227 |
> |
* <a href="{@docRoot}/java.base/java/util/package-summary.html#CollectionsFramework"> |
228 |
|
* Java Collections Framework</a>. |
229 |
|
* |
230 |
|
* @since 1.5 |
232 |
|
* @param <K> the type of keys maintained by this map |
233 |
|
* @param <V> the type of mapped values |
234 |
|
*/ |
235 |
< |
public class ConcurrentHashMap<K, V> extends AbstractMap<K, V> |
236 |
< |
implements ConcurrentMap<K, V>, Serializable { |
235 |
> |
public class ConcurrentHashMap<K,V> extends AbstractMap<K,V> |
236 |
> |
implements ConcurrentMap<K,V>, Serializable { |
237 |
|
private static final long serialVersionUID = 7249069246763182397L; |
238 |
|
|
239 |
|
/* |
240 |
< |
* The basic strategy is to subdivide the table among Segments, |
241 |
< |
* each of which itself is a concurrently readable hash table. |
240 |
> |
* Overview: |
241 |
> |
* |
242 |
> |
* The primary design goal of this hash table is to maintain |
243 |
> |
* concurrent readability (typically method get(), but also |
244 |
> |
* iterators and related methods) while minimizing update |
245 |
> |
* contention. Secondary goals are to keep space consumption about |
246 |
> |
* the same or better than java.util.HashMap, and to support high |
247 |
> |
* initial insertion rates on an empty table by many threads. |
248 |
> |
* |
249 |
> |
* This map usually acts as a binned (bucketed) hash table. Each |
250 |
> |
* key-value mapping is held in a Node. Most nodes are instances |
251 |
> |
* of the basic Node class with hash, key, value, and next |
252 |
> |
* fields. However, various subclasses exist: TreeNodes are |
253 |
> |
* arranged in balanced trees, not lists. TreeBins hold the roots |
254 |
> |
* of sets of TreeNodes. ForwardingNodes are placed at the heads |
255 |
> |
* of bins during resizing. ReservationNodes are used as |
256 |
> |
* placeholders while establishing values in computeIfAbsent and |
257 |
> |
* related methods. The types TreeBin, ForwardingNode, and |
258 |
> |
* ReservationNode do not hold normal user keys, values, or |
259 |
> |
* hashes, and are readily distinguishable during search etc |
260 |
> |
* because they have negative hash fields and null key and value |
261 |
> |
* fields. (These special nodes are either uncommon or transient, |
262 |
> |
* so the impact of carrying around some unused fields is |
263 |
> |
* insignificant.) |
264 |
> |
* |
265 |
> |
* The table is lazily initialized to a power-of-two size upon the |
266 |
> |
* first insertion. Each bin in the table normally contains a |
267 |
> |
* list of Nodes (most often, the list has only zero or one Node). |
268 |
> |
* Table accesses require volatile/atomic reads, writes, and |
269 |
> |
* CASes. Because there is no other way to arrange this without |
270 |
> |
* adding further indirections, we use intrinsics |
271 |
> |
* (jdk.internal.misc.Unsafe) operations. |
272 |
> |
* |
273 |
> |
* We use the top (sign) bit of Node hash fields for control |
274 |
> |
* purposes -- it is available anyway because of addressing |
275 |
> |
* constraints. Nodes with negative hash fields are specially |
276 |
> |
* handled or ignored in map methods. |
277 |
> |
* |
278 |
> |
* Insertion (via put or its variants) of the first node in an |
279 |
> |
* empty bin is performed by just CASing it to the bin. This is |
280 |
> |
* by far the most common case for put operations under most |
281 |
> |
* key/hash distributions. Other update operations (insert, |
282 |
> |
* delete, and replace) require locks. We do not want to waste |
283 |
> |
* the space required to associate a distinct lock object with |
284 |
> |
* each bin, so instead use the first node of a bin list itself as |
285 |
> |
* a lock. Locking support for these locks relies on builtin |
286 |
> |
* "synchronized" monitors. |
287 |
> |
* |
288 |
> |
* Using the first node of a list as a lock does not by itself |
289 |
> |
* suffice though: When a node is locked, any update must first |
290 |
> |
* validate that it is still the first node after locking it, and |
291 |
> |
* retry if not. Because new nodes are always appended to lists, |
292 |
> |
* once a node is first in a bin, it remains first until deleted |
293 |
> |
* or the bin becomes invalidated (upon resizing). |
294 |
> |
* |
295 |
> |
* The main disadvantage of per-bin locks is that other update |
296 |
> |
* operations on other nodes in a bin list protected by the same |
297 |
> |
* lock can stall, for example when user equals() or mapping |
298 |
> |
* functions take a long time. However, statistically, under |
299 |
> |
* random hash codes, this is not a common problem. Ideally, the |
300 |
> |
* frequency of nodes in bins follows a Poisson distribution |
301 |
> |
* (http://en.wikipedia.org/wiki/Poisson_distribution) with a |
302 |
> |
* parameter of about 0.5 on average, given the resizing threshold |
303 |
> |
* of 0.75, although with a large variance because of resizing |
304 |
> |
* granularity. Ignoring variance, the expected occurrences of |
305 |
> |
* list size k are (exp(-0.5) * pow(0.5, k) / factorial(k)). The |
306 |
> |
* first values are: |
307 |
> |
* |
308 |
> |
* 0: 0.60653066 |
309 |
> |
* 1: 0.30326533 |
310 |
> |
* 2: 0.07581633 |
311 |
> |
* 3: 0.01263606 |
312 |
> |
* 4: 0.00157952 |
313 |
> |
* 5: 0.00015795 |
314 |
> |
* 6: 0.00001316 |
315 |
> |
* 7: 0.00000094 |
316 |
> |
* 8: 0.00000006 |
317 |
> |
* more: less than 1 in ten million |
318 |
> |
* |
319 |
> |
* Lock contention probability for two threads accessing distinct |
320 |
> |
* elements is roughly 1 / (8 * #elements) under random hashes. |
321 |
> |
* |
322 |
> |
* Actual hash code distributions encountered in practice |
323 |
> |
* sometimes deviate significantly from uniform randomness. This |
324 |
> |
* includes the case when N > (1<<30), so some keys MUST collide. |
325 |
> |
* Similarly for dumb or hostile usages in which multiple keys are |
326 |
> |
* designed to have identical hash codes or ones that differs only |
327 |
> |
* in masked-out high bits. So we use a secondary strategy that |
328 |
> |
* applies when the number of nodes in a bin exceeds a |
329 |
> |
* threshold. These TreeBins use a balanced tree to hold nodes (a |
330 |
> |
* specialized form of red-black trees), bounding search time to |
331 |
> |
* O(log N). Each search step in a TreeBin is at least twice as |
332 |
> |
* slow as in a regular list, but given that N cannot exceed |
333 |
> |
* (1<<64) (before running out of addresses) this bounds search |
334 |
> |
* steps, lock hold times, etc, to reasonable constants (roughly |
335 |
> |
* 100 nodes inspected per operation worst case) so long as keys |
336 |
> |
* are Comparable (which is very common -- String, Long, etc). |
337 |
> |
* TreeBin nodes (TreeNodes) also maintain the same "next" |
338 |
> |
* traversal pointers as regular nodes, so can be traversed in |
339 |
> |
* iterators in the same way. |
340 |
> |
* |
341 |
> |
* The table is resized when occupancy exceeds a percentage |
342 |
> |
* threshold (nominally, 0.75, but see below). Any thread |
343 |
> |
* noticing an overfull bin may assist in resizing after the |
344 |
> |
* initiating thread allocates and sets up the replacement array. |
345 |
> |
* However, rather than stalling, these other threads may proceed |
346 |
> |
* with insertions etc. The use of TreeBins shields us from the |
347 |
> |
* worst case effects of overfilling while resizes are in |
348 |
> |
* progress. Resizing proceeds by transferring bins, one by one, |
349 |
> |
* from the table to the next table. However, threads claim small |
350 |
> |
* blocks of indices to transfer (via field transferIndex) before |
351 |
> |
* doing so, reducing contention. A generation stamp in field |
352 |
> |
* sizeCtl ensures that resizings do not overlap. Because we are |
353 |
> |
* using power-of-two expansion, the elements from each bin must |
354 |
> |
* either stay at same index, or move with a power of two |
355 |
> |
* offset. We eliminate unnecessary node creation by catching |
356 |
> |
* cases where old nodes can be reused because their next fields |
357 |
> |
* won't change. On average, only about one-sixth of them need |
358 |
> |
* cloning when a table doubles. The nodes they replace will be |
359 |
> |
* garbage collectible as soon as they are no longer referenced by |
360 |
> |
* any reader thread that may be in the midst of concurrently |
361 |
> |
* traversing table. Upon transfer, the old table bin contains |
362 |
> |
* only a special forwarding node (with hash field "MOVED") that |
363 |
> |
* contains the next table as its key. On encountering a |
364 |
> |
* forwarding node, access and update operations restart, using |
365 |
> |
* the new table. |
366 |
> |
* |
367 |
> |
* Each bin transfer requires its bin lock, which can stall |
368 |
> |
* waiting for locks while resizing. However, because other |
369 |
> |
* threads can join in and help resize rather than contend for |
370 |
> |
* locks, average aggregate waits become shorter as resizing |
371 |
> |
* progresses. The transfer operation must also ensure that all |
372 |
> |
* accessible bins in both the old and new table are usable by any |
373 |
> |
* traversal. This is arranged in part by proceeding from the |
374 |
> |
* last bin (table.length - 1) up towards the first. Upon seeing |
375 |
> |
* a forwarding node, traversals (see class Traverser) arrange to |
376 |
> |
* move to the new table without revisiting nodes. To ensure that |
377 |
> |
* no intervening nodes are skipped even when moved out of order, |
378 |
> |
* a stack (see class TableStack) is created on first encounter of |
379 |
> |
* a forwarding node during a traversal, to maintain its place if |
380 |
> |
* later processing the current table. The need for these |
381 |
> |
* save/restore mechanics is relatively rare, but when one |
382 |
> |
* forwarding node is encountered, typically many more will be. |
383 |
> |
* So Traversers use a simple caching scheme to avoid creating so |
384 |
> |
* many new TableStack nodes. (Thanks to Peter Levart for |
385 |
> |
* suggesting use of a stack here.) |
386 |
> |
* |
387 |
> |
* The traversal scheme also applies to partial traversals of |
388 |
> |
* ranges of bins (via an alternate Traverser constructor) |
389 |
> |
* to support partitioned aggregate operations. Also, read-only |
390 |
> |
* operations give up if ever forwarded to a null table, which |
391 |
> |
* provides support for shutdown-style clearing, which is also not |
392 |
> |
* currently implemented. |
393 |
> |
* |
394 |
> |
* Lazy table initialization minimizes footprint until first use, |
395 |
> |
* and also avoids resizings when the first operation is from a |
396 |
> |
* putAll, constructor with map argument, or deserialization. |
397 |
> |
* These cases attempt to override the initial capacity settings, |
398 |
> |
* but harmlessly fail to take effect in cases of races. |
399 |
> |
* |
400 |
> |
* The element count is maintained using a specialization of |
401 |
> |
* LongAdder. We need to incorporate a specialization rather than |
402 |
> |
* just use a LongAdder in order to access implicit |
403 |
> |
* contention-sensing that leads to creation of multiple |
404 |
> |
* CounterCells. The counter mechanics avoid contention on |
405 |
> |
* updates but can encounter cache thrashing if read too |
406 |
> |
* frequently during concurrent access. To avoid reading so often, |
407 |
> |
* resizing under contention is attempted only upon adding to a |
408 |
> |
* bin already holding two or more nodes. Under uniform hash |
409 |
> |
* distributions, the probability of this occurring at threshold |
410 |
> |
* is around 13%, meaning that only about 1 in 8 puts check |
411 |
> |
* threshold (and after resizing, many fewer do so). |
412 |
> |
* |
413 |
> |
* TreeBins use a special form of comparison for search and |
414 |
> |
* related operations (which is the main reason we cannot use |
415 |
> |
* existing collections such as TreeMaps). TreeBins contain |
416 |
> |
* Comparable elements, but may contain others, as well as |
417 |
> |
* elements that are Comparable but not necessarily Comparable for |
418 |
> |
* the same T, so we cannot invoke compareTo among them. To handle |
419 |
> |
* this, the tree is ordered primarily by hash value, then by |
420 |
> |
* Comparable.compareTo order if applicable. On lookup at a node, |
421 |
> |
* if elements are not comparable or compare as 0 then both left |
422 |
> |
* and right children may need to be searched in the case of tied |
423 |
> |
* hash values. (This corresponds to the full list search that |
424 |
> |
* would be necessary if all elements were non-Comparable and had |
425 |
> |
* tied hashes.) On insertion, to keep a total ordering (or as |
426 |
> |
* close as is required here) across rebalancings, we compare |
427 |
> |
* classes and identityHashCodes as tie-breakers. The red-black |
428 |
> |
* balancing code is updated from pre-jdk-collections |
429 |
> |
* (http://gee.cs.oswego.edu/dl/classes/collections/RBCell.java) |
430 |
> |
* based in turn on Cormen, Leiserson, and Rivest "Introduction to |
431 |
> |
* Algorithms" (CLR). |
432 |
> |
* |
433 |
> |
* TreeBins also require an additional locking mechanism. While |
434 |
> |
* list traversal is always possible by readers even during |
435 |
> |
* updates, tree traversal is not, mainly because of tree-rotations |
436 |
> |
* that may change the root node and/or its linkages. TreeBins |
437 |
> |
* include a simple read-write lock mechanism parasitic on the |
438 |
> |
* main bin-synchronization strategy: Structural adjustments |
439 |
> |
* associated with an insertion or removal are already bin-locked |
440 |
> |
* (and so cannot conflict with other writers) but must wait for |
441 |
> |
* ongoing readers to finish. Since there can be only one such |
442 |
> |
* waiter, we use a simple scheme using a single "waiter" field to |
443 |
> |
* block writers. However, readers need never block. If the root |
444 |
> |
* lock is held, they proceed along the slow traversal path (via |
445 |
> |
* next-pointers) until the lock becomes available or the list is |
446 |
> |
* exhausted, whichever comes first. These cases are not fast, but |
447 |
> |
* maximize aggregate expected throughput. |
448 |
> |
* |
449 |
> |
* Maintaining API and serialization compatibility with previous |
450 |
> |
* versions of this class introduces several oddities. Mainly: We |
451 |
> |
* leave untouched but unused constructor arguments referring to |
452 |
> |
* concurrencyLevel. We accept a loadFactor constructor argument, |
453 |
> |
* but apply it only to initial table capacity (which is the only |
454 |
> |
* time that we can guarantee to honor it.) We also declare an |
455 |
> |
* unused "Segment" class that is instantiated in minimal form |
456 |
> |
* only when serializing. |
457 |
> |
* |
458 |
> |
* Also, solely for compatibility with previous versions of this |
459 |
> |
* class, it extends AbstractMap, even though all of its methods |
460 |
> |
* are overridden, so it is just useless baggage. |
461 |
> |
* |
462 |
> |
* This file is organized to make things a little easier to follow |
463 |
> |
* while reading than they might otherwise: First the main static |
464 |
> |
* declarations and utilities, then fields, then main public |
465 |
> |
* methods (with a few factorings of multiple public methods into |
466 |
> |
* internal ones), then sizing methods, trees, traversers, and |
467 |
> |
* bulk operations. |
468 |
|
*/ |
469 |
|
|
470 |
|
/* ---------------- Constants -------------- */ |
471 |
|
|
472 |
|
/** |
473 |
< |
* The default initial capacity for this table, |
474 |
< |
* used when not otherwise specified in a constructor. |
473 |
> |
* The largest possible table capacity. This value must be |
474 |
> |
* exactly 1<<30 to stay within Java array allocation and indexing |
475 |
> |
* bounds for power of two table sizes, and is further required |
476 |
> |
* because the top two bits of 32bit hash fields are used for |
477 |
> |
* control purposes. |
478 |
|
*/ |
479 |
< |
static final int DEFAULT_INITIAL_CAPACITY = 16; |
479 |
> |
private static final int MAXIMUM_CAPACITY = 1 << 30; |
480 |
|
|
481 |
|
/** |
482 |
< |
* The default load factor for this table, used when not |
483 |
< |
* otherwise specified in a constructor. |
482 |
> |
* The default initial table capacity. Must be a power of 2 |
483 |
> |
* (i.e., at least 1) and at most MAXIMUM_CAPACITY. |
484 |
|
*/ |
485 |
< |
static final float DEFAULT_LOAD_FACTOR = 0.75f; |
485 |
> |
private static final int DEFAULT_CAPACITY = 16; |
486 |
|
|
487 |
|
/** |
488 |
< |
* The default concurrency level for this table, used when not |
489 |
< |
* otherwise specified in a constructor. |
488 |
> |
* The largest possible (non-power of two) array size. |
489 |
> |
* Needed by toArray and related methods. |
490 |
|
*/ |
491 |
< |
static final int DEFAULT_CONCURRENCY_LEVEL = 16; |
491 |
> |
static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8; |
492 |
|
|
493 |
|
/** |
494 |
< |
* The maximum capacity, used if a higher value is implicitly |
495 |
< |
* specified by either of the constructors with arguments. MUST |
105 |
< |
* be a power of two <= 1<<30 to ensure that entries are indexable |
106 |
< |
* using ints. |
494 |
> |
* The default concurrency level for this table. Unused but |
495 |
> |
* defined for compatibility with previous versions of this class. |
496 |
|
*/ |
497 |
< |
static final int MAXIMUM_CAPACITY = 1 << 30; |
497 |
> |
private static final int DEFAULT_CONCURRENCY_LEVEL = 16; |
498 |
|
|
499 |
|
/** |
500 |
< |
* The maximum number of segments to allow; used to bound |
501 |
< |
* constructor arguments. |
500 |
> |
* The load factor for this table. Overrides of this value in |
501 |
> |
* constructors affect only the initial table capacity. The |
502 |
> |
* actual floating point value isn't normally used -- it is |
503 |
> |
* simpler to use expressions such as {@code n - (n >>> 2)} for |
504 |
> |
* the associated resizing threshold. |
505 |
|
*/ |
506 |
< |
static final int MAX_SEGMENTS = 1 << 16; // slightly conservative |
506 |
> |
private static final float LOAD_FACTOR = 0.75f; |
507 |
|
|
508 |
|
/** |
509 |
< |
* Number of unsynchronized retries in size and containsValue |
510 |
< |
* methods before resorting to locking. This is used to avoid |
511 |
< |
* unbounded retries if tables undergo continuous modification |
512 |
< |
* which would make it impossible to obtain an accurate result. |
509 |
> |
* The bin count threshold for using a tree rather than list for a |
510 |
> |
* bin. Bins are converted to trees when adding an element to a |
511 |
> |
* bin with at least this many nodes. The value must be greater |
512 |
> |
* than 2, and should be at least 8 to mesh with assumptions in |
513 |
> |
* tree removal about conversion back to plain bins upon |
514 |
> |
* shrinkage. |
515 |
|
*/ |
516 |
< |
static final int RETRIES_BEFORE_LOCK = 2; |
123 |
< |
|
124 |
< |
/* ---------------- Fields -------------- */ |
516 |
> |
static final int TREEIFY_THRESHOLD = 8; |
517 |
|
|
518 |
|
/** |
519 |
< |
* Mask value for indexing into segments. The upper bits of a |
520 |
< |
* key's hash code are used to choose the segment. |
519 |
> |
* The bin count threshold for untreeifying a (split) bin during a |
520 |
> |
* resize operation. Should be less than TREEIFY_THRESHOLD, and at |
521 |
> |
* most 6 to mesh with shrinkage detection under removal. |
522 |
|
*/ |
523 |
< |
final int segmentMask; |
523 |
> |
static final int UNTREEIFY_THRESHOLD = 6; |
524 |
|
|
525 |
|
/** |
526 |
< |
* Shift value for indexing within segments. |
526 |
> |
* The smallest table capacity for which bins may be treeified. |
527 |
> |
* (Otherwise the table is resized if too many nodes in a bin.) |
528 |
> |
* The value should be at least 4 * TREEIFY_THRESHOLD to avoid |
529 |
> |
* conflicts between resizing and treeification thresholds. |
530 |
|
*/ |
531 |
< |
final int segmentShift; |
531 |
> |
static final int MIN_TREEIFY_CAPACITY = 64; |
532 |
|
|
533 |
|
/** |
534 |
< |
* The segments, each of which is a specialized hash table |
534 |
> |
* Minimum number of rebinnings per transfer step. Ranges are |
535 |
> |
* subdivided to allow multiple resizer threads. This value |
536 |
> |
* serves as a lower bound to avoid resizers encountering |
537 |
> |
* excessive memory contention. The value should be at least |
538 |
> |
* DEFAULT_CAPACITY. |
539 |
|
*/ |
540 |
< |
final Segment<K,V>[] segments; |
540 |
> |
private static final int MIN_TRANSFER_STRIDE = 16; |
541 |
|
|
542 |
< |
transient Set<K> keySet; |
543 |
< |
transient Set<Map.Entry<K,V>> entrySet; |
544 |
< |
transient Collection<V> values; |
545 |
< |
|
546 |
< |
/* ---------------- Small Utilities -------------- */ |
542 |
> |
/** |
543 |
> |
* The number of bits used for generation stamp in sizeCtl. |
544 |
> |
* Must be at least 6 for 32bit arrays. |
545 |
> |
*/ |
546 |
> |
private static final int RESIZE_STAMP_BITS = 16; |
547 |
|
|
548 |
|
/** |
549 |
< |
* Returns a hash code for non-null Object x. |
550 |
< |
* Uses the same hash code spreader as most other java.util hash tables. |
151 |
< |
* @param x the object serving as a key |
152 |
< |
* @return the hash code |
549 |
> |
* The maximum number of threads that can help resize. |
550 |
> |
* Must fit in 32 - RESIZE_STAMP_BITS bits. |
551 |
|
*/ |
552 |
< |
static int hash(Object x) { |
155 |
< |
int h = x.hashCode(); |
156 |
< |
h += ~(h << 9); |
157 |
< |
h ^= (h >>> 14); |
158 |
< |
h += (h << 4); |
159 |
< |
h ^= (h >>> 10); |
160 |
< |
return h; |
161 |
< |
} |
552 |
> |
private static final int MAX_RESIZERS = (1 << (32 - RESIZE_STAMP_BITS)) - 1; |
553 |
|
|
554 |
|
/** |
555 |
< |
* Returns the segment that should be used for key with given hash |
165 |
< |
* @param hash the hash code for the key |
166 |
< |
* @return the segment |
555 |
> |
* The bit shift for recording size stamp in sizeCtl. |
556 |
|
*/ |
557 |
< |
final Segment<K,V> segmentFor(int hash) { |
558 |
< |
return segments[(hash >>> segmentShift) & segmentMask]; |
559 |
< |
} |
557 |
> |
private static final int RESIZE_STAMP_SHIFT = 32 - RESIZE_STAMP_BITS; |
558 |
> |
|
559 |
> |
/* |
560 |
> |
* Encodings for Node hash fields. See above for explanation. |
561 |
> |
*/ |
562 |
> |
static final int MOVED = -1; // hash for forwarding nodes |
563 |
> |
static final int TREEBIN = -2; // hash for roots of trees |
564 |
> |
static final int RESERVED = -3; // hash for transient reservations |
565 |
> |
static final int HASH_BITS = 0x7fffffff; // usable bits of normal node hash |
566 |
|
|
567 |
< |
/* ---------------- Inner Classes -------------- */ |
567 |
> |
/** Number of CPUS, to place bounds on some sizings */ |
568 |
> |
static final int NCPU = Runtime.getRuntime().availableProcessors(); |
569 |
|
|
570 |
|
/** |
571 |
< |
* ConcurrentHashMap list entry. Note that this is never exported |
572 |
< |
* out as a user-visible Map.Entry. |
573 |
< |
* |
574 |
< |
* Because the value field is volatile, not final, it is legal wrt |
575 |
< |
* the Java Memory Model for an unsynchronized reader to see null |
576 |
< |
* instead of initial value when read via a data race. Although a |
577 |
< |
* reordering leading to this is not likely to ever actually |
578 |
< |
* occur, the Segment.readValueUnderLock method is used as a |
579 |
< |
* backup in case a null (pre-initialized) value is ever seen in |
580 |
< |
* an unsynchronized access method. |
571 |
> |
* Serialized pseudo-fields, provided only for jdk7 compatibility. |
572 |
> |
* @serialField segments Segment[] |
573 |
> |
* The segments, each of which is a specialized hash table. |
574 |
> |
* @serialField segmentMask int |
575 |
> |
* Mask value for indexing into segments. The upper bits of a |
576 |
> |
* key's hash code are used to choose the segment. |
577 |
> |
* @serialField segmentShift int |
578 |
> |
* Shift value for indexing within segments. |
579 |
> |
*/ |
580 |
> |
private static final ObjectStreamField[] serialPersistentFields = { |
581 |
> |
new ObjectStreamField("segments", Segment[].class), |
582 |
> |
new ObjectStreamField("segmentMask", Integer.TYPE), |
583 |
> |
new ObjectStreamField("segmentShift", Integer.TYPE), |
584 |
> |
}; |
585 |
> |
|
586 |
> |
/* ---------------- Nodes -------------- */ |
587 |
> |
|
588 |
> |
/** |
589 |
> |
* Key-value entry. This class is never exported out as a |
590 |
> |
* user-mutable Map.Entry (i.e., one supporting setValue; see |
591 |
> |
* MapEntry below), but can be used for read-only traversals used |
592 |
> |
* in bulk tasks. Subclasses of Node with a negative hash field |
593 |
> |
* are special, and contain null keys and values (but are never |
594 |
> |
* exported). Otherwise, keys and vals are never null. |
595 |
|
*/ |
596 |
< |
static final class HashEntry<K,V> { |
187 |
< |
final K key; |
596 |
> |
static class Node<K,V> implements Map.Entry<K,V> { |
597 |
|
final int hash; |
598 |
< |
volatile V value; |
599 |
< |
final HashEntry<K,V> next; |
598 |
> |
final K key; |
599 |
> |
volatile V val; |
600 |
> |
volatile Node<K,V> next; |
601 |
|
|
602 |
< |
HashEntry(K key, int hash, HashEntry<K,V> next, V value) { |
193 |
< |
this.key = key; |
602 |
> |
Node(int hash, K key, V val) { |
603 |
|
this.hash = hash; |
604 |
+ |
this.key = key; |
605 |
+ |
this.val = val; |
606 |
+ |
} |
607 |
+ |
|
608 |
+ |
Node(int hash, K key, V val, Node<K,V> next) { |
609 |
+ |
this(hash, key, val); |
610 |
|
this.next = next; |
196 |
– |
this.value = value; |
611 |
|
} |
612 |
|
|
613 |
< |
@SuppressWarnings("unchecked") |
614 |
< |
static final <K,V> HashEntry<K,V>[] newArray(int i) { |
615 |
< |
return new HashEntry[i]; |
616 |
< |
} |
613 |
> |
public final K getKey() { return key; } |
614 |
> |
public final V getValue() { return val; } |
615 |
> |
public final int hashCode() { return key.hashCode() ^ val.hashCode(); } |
616 |
> |
public final String toString() { |
617 |
> |
return Helpers.mapEntryToString(key, val); |
618 |
> |
} |
619 |
> |
public final V setValue(V value) { |
620 |
> |
throw new UnsupportedOperationException(); |
621 |
> |
} |
622 |
> |
|
623 |
> |
public final boolean equals(Object o) { |
624 |
> |
Object k, v, u; Map.Entry<?,?> e; |
625 |
> |
return ((o instanceof Map.Entry) && |
626 |
> |
(k = (e = (Map.Entry<?,?>)o).getKey()) != null && |
627 |
> |
(v = e.getValue()) != null && |
628 |
> |
(k == key || k.equals(key)) && |
629 |
> |
(v == (u = val) || v.equals(u))); |
630 |
> |
} |
631 |
> |
|
632 |
> |
/** |
633 |
> |
* Virtualized support for map.get(); overridden in subclasses. |
634 |
> |
*/ |
635 |
> |
Node<K,V> find(int h, Object k) { |
636 |
> |
Node<K,V> e = this; |
637 |
> |
if (k != null) { |
638 |
> |
do { |
639 |
> |
K ek; |
640 |
> |
if (e.hash == h && |
641 |
> |
((ek = e.key) == k || (ek != null && k.equals(ek)))) |
642 |
> |
return e; |
643 |
> |
} while ((e = e.next) != null); |
644 |
> |
} |
645 |
> |
return null; |
646 |
> |
} |
647 |
|
} |
648 |
|
|
649 |
+ |
/* ---------------- Static utilities -------------- */ |
650 |
+ |
|
651 |
|
/** |
652 |
< |
* Segments are specialized versions of hash tables. This |
653 |
< |
* subclasses from ReentrantLock opportunistically, just to |
654 |
< |
* simplify some locking and avoid separate construction. |
652 |
> |
* Spreads (XORs) higher bits of hash to lower and also forces top |
653 |
> |
* bit to 0. Because the table uses power-of-two masking, sets of |
654 |
> |
* hashes that vary only in bits above the current mask will |
655 |
> |
* always collide. (Among known examples are sets of Float keys |
656 |
> |
* holding consecutive whole numbers in small tables.) So we |
657 |
> |
* apply a transform that spreads the impact of higher bits |
658 |
> |
* downward. There is a tradeoff between speed, utility, and |
659 |
> |
* quality of bit-spreading. Because many common sets of hashes |
660 |
> |
* are already reasonably distributed (so don't benefit from |
661 |
> |
* spreading), and because we use trees to handle large sets of |
662 |
> |
* collisions in bins, we just XOR some shifted bits in the |
663 |
> |
* cheapest possible way to reduce systematic lossage, as well as |
664 |
> |
* to incorporate impact of the highest bits that would otherwise |
665 |
> |
* never be used in index calculations because of table bounds. |
666 |
|
*/ |
667 |
< |
static final class Segment<K,V> extends ReentrantLock implements Serializable { |
668 |
< |
/* |
669 |
< |
* Segments maintain a table of entry lists that are ALWAYS |
213 |
< |
* kept in a consistent state, so can be read without locking. |
214 |
< |
* Next fields of nodes are immutable (final). All list |
215 |
< |
* additions are performed at the front of each bin. This |
216 |
< |
* makes it easy to check changes, and also fast to traverse. |
217 |
< |
* When nodes would otherwise be changed, new nodes are |
218 |
< |
* created to replace them. This works well for hash tables |
219 |
< |
* since the bin lists tend to be short. (The average length |
220 |
< |
* is less than two for the default load factor threshold.) |
221 |
< |
* |
222 |
< |
* Read operations can thus proceed without locking, but rely |
223 |
< |
* on selected uses of volatiles to ensure that completed |
224 |
< |
* write operations performed by other threads are |
225 |
< |
* noticed. For most purposes, the "count" field, tracking the |
226 |
< |
* number of elements, serves as that volatile variable |
227 |
< |
* ensuring visibility. This is convenient because this field |
228 |
< |
* needs to be read in many read operations anyway: |
229 |
< |
* |
230 |
< |
* - All (unsynchronized) read operations must first read the |
231 |
< |
* "count" field, and should not look at table entries if |
232 |
< |
* it is 0. |
233 |
< |
* |
234 |
< |
* - All (synchronized) write operations should write to |
235 |
< |
* the "count" field after structurally changing any bin. |
236 |
< |
* The operations must not take any action that could even |
237 |
< |
* momentarily cause a concurrent read operation to see |
238 |
< |
* inconsistent data. This is made easier by the nature of |
239 |
< |
* the read operations in Map. For example, no operation |
240 |
< |
* can reveal that the table has grown but the threshold |
241 |
< |
* has not yet been updated, so there are no atomicity |
242 |
< |
* requirements for this with respect to reads. |
243 |
< |
* |
244 |
< |
* As a guide, all critical volatile reads and writes to the |
245 |
< |
* count field are marked in code comments. |
246 |
< |
*/ |
667 |
> |
static final int spread(int h) { |
668 |
> |
return (h ^ (h >>> 16)) & HASH_BITS; |
669 |
> |
} |
670 |
|
|
671 |
< |
private static final long serialVersionUID = 2249069246763182397L; |
671 |
> |
/** |
672 |
> |
* Returns a power of two table size for the given desired capacity. |
673 |
> |
* See Hackers Delight, sec 3.2 |
674 |
> |
*/ |
675 |
> |
private static final int tableSizeFor(int c) { |
676 |
> |
int n = -1 >>> Integer.numberOfLeadingZeros(c - 1); |
677 |
> |
return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1; |
678 |
> |
} |
679 |
|
|
680 |
< |
/** |
681 |
< |
* The number of elements in this segment's region. |
682 |
< |
*/ |
683 |
< |
transient volatile int count; |
680 |
> |
/** |
681 |
> |
* Returns x's Class if it is of the form "class C implements |
682 |
> |
* Comparable<C>", else null. |
683 |
> |
*/ |
684 |
> |
static Class<?> comparableClassFor(Object x) { |
685 |
> |
if (x instanceof Comparable) { |
686 |
> |
Class<?> c; Type[] ts, as; ParameterizedType p; |
687 |
> |
if ((c = x.getClass()) == String.class) // bypass checks |
688 |
> |
return c; |
689 |
> |
if ((ts = c.getGenericInterfaces()) != null) { |
690 |
> |
for (Type t : ts) { |
691 |
> |
if ((t instanceof ParameterizedType) && |
692 |
> |
((p = (ParameterizedType)t).getRawType() == |
693 |
> |
Comparable.class) && |
694 |
> |
(as = p.getActualTypeArguments()) != null && |
695 |
> |
as.length == 1 && as[0] == c) // type arg is c |
696 |
> |
return c; |
697 |
> |
} |
698 |
> |
} |
699 |
> |
} |
700 |
> |
return null; |
701 |
> |
} |
702 |
|
|
703 |
< |
/** |
704 |
< |
* Number of updates that alter the size of the table. This is |
705 |
< |
* used during bulk-read methods to make sure they see a |
706 |
< |
* consistent snapshot: If modCounts change during a traversal |
707 |
< |
* of segments computing size or checking containsValue, then |
708 |
< |
* we might have an inconsistent view of state so (usually) |
709 |
< |
* must retry. |
710 |
< |
*/ |
711 |
< |
transient int modCount; |
703 |
> |
/** |
704 |
> |
* Returns k.compareTo(x) if x matches kc (k's screened comparable |
705 |
> |
* class), else 0. |
706 |
> |
*/ |
707 |
> |
@SuppressWarnings({"rawtypes","unchecked"}) // for cast to Comparable |
708 |
> |
static int compareComparables(Class<?> kc, Object k, Object x) { |
709 |
> |
return (x == null || x.getClass() != kc ? 0 : |
710 |
> |
((Comparable)k).compareTo(x)); |
711 |
> |
} |
712 |
|
|
713 |
< |
/** |
266 |
< |
* The table is rehashed when its size exceeds this threshold. |
267 |
< |
* (The value of this field is always <tt>(int)(capacity * |
268 |
< |
* loadFactor)</tt>.) |
269 |
< |
*/ |
270 |
< |
transient int threshold; |
713 |
> |
/* ---------------- Table element access -------------- */ |
714 |
|
|
715 |
< |
/** |
716 |
< |
* The per-segment table. |
717 |
< |
*/ |
718 |
< |
transient volatile HashEntry<K,V>[] table; |
715 |
> |
/* |
716 |
> |
* Atomic access methods are used for table elements as well as |
717 |
> |
* elements of in-progress next table while resizing. All uses of |
718 |
> |
* the tab arguments must be null checked by callers. All callers |
719 |
> |
* also paranoically precheck that tab's length is not zero (or an |
720 |
> |
* equivalent check), thus ensuring that any index argument taking |
721 |
> |
* the form of a hash value anded with (length - 1) is a valid |
722 |
> |
* index. Note that, to be correct wrt arbitrary concurrency |
723 |
> |
* errors by users, these checks must operate on local variables, |
724 |
> |
* which accounts for some odd-looking inline assignments below. |
725 |
> |
* Note that calls to setTabAt always occur within locked regions, |
726 |
> |
* and so require only release ordering. |
727 |
> |
*/ |
728 |
> |
|
729 |
> |
@SuppressWarnings("unchecked") |
730 |
> |
static final <K,V> Node<K,V> tabAt(Node<K,V>[] tab, int i) { |
731 |
> |
return (Node<K,V>)U.getObjectAcquire(tab, ((long)i << ASHIFT) + ABASE); |
732 |
> |
} |
733 |
|
|
734 |
< |
/** |
735 |
< |
* The load factor for the hash table. Even though this value |
736 |
< |
* is same for all segments, it is replicated to avoid needing |
737 |
< |
* links to outer object. |
281 |
< |
* @serial |
282 |
< |
*/ |
283 |
< |
final float loadFactor; |
734 |
> |
static final <K,V> boolean casTabAt(Node<K,V>[] tab, int i, |
735 |
> |
Node<K,V> c, Node<K,V> v) { |
736 |
> |
return U.compareAndSetObject(tab, ((long)i << ASHIFT) + ABASE, c, v); |
737 |
> |
} |
738 |
|
|
739 |
< |
Segment(int initialCapacity, float lf) { |
740 |
< |
loadFactor = lf; |
741 |
< |
setTable(HashEntry.<K,V>newArray(initialCapacity)); |
288 |
< |
} |
739 |
> |
static final <K,V> void setTabAt(Node<K,V>[] tab, int i, Node<K,V> v) { |
740 |
> |
U.putObjectRelease(tab, ((long)i << ASHIFT) + ABASE, v); |
741 |
> |
} |
742 |
|
|
743 |
< |
@SuppressWarnings("unchecked") |
291 |
< |
static final <K,V> Segment<K,V>[] newArray(int i) { |
292 |
< |
return new Segment[i]; |
293 |
< |
} |
743 |
> |
/* ---------------- Fields -------------- */ |
744 |
|
|
745 |
< |
/** |
746 |
< |
* Sets table to new HashEntry array. |
747 |
< |
* Call only while holding lock or in constructor. |
748 |
< |
*/ |
749 |
< |
void setTable(HashEntry<K,V>[] newTable) { |
300 |
< |
threshold = (int)(newTable.length * loadFactor); |
301 |
< |
table = newTable; |
302 |
< |
} |
745 |
> |
/** |
746 |
> |
* The array of bins. Lazily initialized upon first insertion. |
747 |
> |
* Size is always a power of two. Accessed directly by iterators. |
748 |
> |
*/ |
749 |
> |
transient volatile Node<K,V>[] table; |
750 |
|
|
751 |
< |
/** |
752 |
< |
* Returns properly casted first entry of bin for given hash. |
753 |
< |
*/ |
754 |
< |
HashEntry<K,V> getFirst(int hash) { |
308 |
< |
HashEntry<K,V>[] tab = table; |
309 |
< |
return tab[hash & (tab.length - 1)]; |
310 |
< |
} |
751 |
> |
/** |
752 |
> |
* The next table to use; non-null only while resizing. |
753 |
> |
*/ |
754 |
> |
private transient volatile Node<K,V>[] nextTable; |
755 |
|
|
756 |
< |
/** |
757 |
< |
* Reads value field of an entry under lock. Called if value |
758 |
< |
* field ever appears to be null. This is possible only if a |
759 |
< |
* compiler happens to reorder a HashEntry initialization with |
760 |
< |
* its table assignment, which is legal under memory model |
761 |
< |
* but is not known to ever occur. |
318 |
< |
*/ |
319 |
< |
V readValueUnderLock(HashEntry<K,V> e) { |
320 |
< |
lock(); |
321 |
< |
try { |
322 |
< |
return e.value; |
323 |
< |
} finally { |
324 |
< |
unlock(); |
325 |
< |
} |
326 |
< |
} |
756 |
> |
/** |
757 |
> |
* Base counter value, used mainly when there is no contention, |
758 |
> |
* but also as a fallback during table initialization |
759 |
> |
* races. Updated via CAS. |
760 |
> |
*/ |
761 |
> |
private transient volatile long baseCount; |
762 |
|
|
763 |
< |
/* Specialized implementations of map methods */ |
763 |
> |
/** |
764 |
> |
* Table initialization and resizing control. When negative, the |
765 |
> |
* table is being initialized or resized: -1 for initialization, |
766 |
> |
* else -(1 + the number of active resizing threads). Otherwise, |
767 |
> |
* when table is null, holds the initial table size to use upon |
768 |
> |
* creation, or 0 for default. After initialization, holds the |
769 |
> |
* next element count value upon which to resize the table. |
770 |
> |
*/ |
771 |
> |
private transient volatile int sizeCtl; |
772 |
|
|
773 |
< |
V get(Object key, int hash) { |
774 |
< |
if (count != 0) { // read-volatile |
775 |
< |
HashEntry<K,V> e = getFirst(hash); |
776 |
< |
while (e != null) { |
334 |
< |
if (e.hash == hash && key.equals(e.key)) { |
335 |
< |
V v = e.value; |
336 |
< |
if (v != null) |
337 |
< |
return v; |
338 |
< |
return readValueUnderLock(e); // recheck |
339 |
< |
} |
340 |
< |
e = e.next; |
341 |
< |
} |
342 |
< |
} |
343 |
< |
return null; |
344 |
< |
} |
773 |
> |
/** |
774 |
> |
* The next table index (plus one) to split while resizing. |
775 |
> |
*/ |
776 |
> |
private transient volatile int transferIndex; |
777 |
|
|
778 |
< |
boolean containsKey(Object key, int hash) { |
779 |
< |
if (count != 0) { // read-volatile |
780 |
< |
HashEntry<K,V> e = getFirst(hash); |
781 |
< |
while (e != null) { |
350 |
< |
if (e.hash == hash && key.equals(e.key)) |
351 |
< |
return true; |
352 |
< |
e = e.next; |
353 |
< |
} |
354 |
< |
} |
355 |
< |
return false; |
356 |
< |
} |
778 |
> |
/** |
779 |
> |
* Spinlock (locked via CAS) used when resizing and/or creating CounterCells. |
780 |
> |
*/ |
781 |
> |
private transient volatile int cellsBusy; |
782 |
|
|
783 |
< |
boolean containsValue(Object value) { |
784 |
< |
if (count != 0) { // read-volatile |
785 |
< |
HashEntry<K,V>[] tab = table; |
786 |
< |
int len = tab.length; |
362 |
< |
for (int i = 0 ; i < len; i++) { |
363 |
< |
for (HashEntry<K,V> e = tab[i]; e != null; e = e.next) { |
364 |
< |
V v = e.value; |
365 |
< |
if (v == null) // recheck |
366 |
< |
v = readValueUnderLock(e); |
367 |
< |
if (value.equals(v)) |
368 |
< |
return true; |
369 |
< |
} |
370 |
< |
} |
371 |
< |
} |
372 |
< |
return false; |
373 |
< |
} |
783 |
> |
/** |
784 |
> |
* Table of counter cells. When non-null, size is a power of 2. |
785 |
> |
*/ |
786 |
> |
private transient volatile CounterCell[] counterCells; |
787 |
|
|
788 |
< |
boolean replace(K key, int hash, V oldValue, V newValue) { |
789 |
< |
lock(); |
790 |
< |
try { |
791 |
< |
HashEntry<K,V> e = getFirst(hash); |
792 |
< |
while (e != null && (e.hash != hash || !key.equals(e.key))) |
793 |
< |
e = e.next; |
794 |
< |
|
795 |
< |
boolean replaced = false; |
796 |
< |
if (e != null && oldValue.equals(e.value)) { |
797 |
< |
replaced = true; |
798 |
< |
e.value = newValue; |
799 |
< |
} |
800 |
< |
return replaced; |
801 |
< |
} finally { |
802 |
< |
unlock(); |
788 |
> |
// views |
789 |
> |
private transient KeySetView<K,V> keySet; |
790 |
> |
private transient ValuesView<K,V> values; |
791 |
> |
private transient EntrySetView<K,V> entrySet; |
792 |
> |
|
793 |
> |
|
794 |
> |
/* ---------------- Public operations -------------- */ |
795 |
> |
|
796 |
> |
/** |
797 |
> |
* Creates a new, empty map with the default initial table size (16). |
798 |
> |
*/ |
799 |
> |
public ConcurrentHashMap() { |
800 |
> |
} |
801 |
> |
|
802 |
> |
/** |
803 |
> |
* Creates a new, empty map with an initial table size |
804 |
> |
* accommodating the specified number of elements without the need |
805 |
> |
* to dynamically resize. |
806 |
> |
* |
807 |
> |
* @param initialCapacity The implementation performs internal |
808 |
> |
* sizing to accommodate this many elements. |
809 |
> |
* @throws IllegalArgumentException if the initial capacity of |
810 |
> |
* elements is negative |
811 |
> |
*/ |
812 |
> |
public ConcurrentHashMap(int initialCapacity) { |
813 |
> |
this(initialCapacity, LOAD_FACTOR, 1); |
814 |
> |
} |
815 |
> |
|
816 |
> |
/** |
817 |
> |
* Creates a new map with the same mappings as the given map. |
818 |
> |
* |
819 |
> |
* @param m the map |
820 |
> |
*/ |
821 |
> |
public ConcurrentHashMap(Map<? extends K, ? extends V> m) { |
822 |
> |
this.sizeCtl = DEFAULT_CAPACITY; |
823 |
> |
putAll(m); |
824 |
> |
} |
825 |
> |
|
826 |
> |
/** |
827 |
> |
* Creates a new, empty map with an initial table size based on |
828 |
> |
* the given number of elements ({@code initialCapacity}) and |
829 |
> |
* initial table density ({@code loadFactor}). |
830 |
> |
* |
831 |
> |
* @param initialCapacity the initial capacity. The implementation |
832 |
> |
* performs internal sizing to accommodate this many elements, |
833 |
> |
* given the specified load factor. |
834 |
> |
* @param loadFactor the load factor (table density) for |
835 |
> |
* establishing the initial table size |
836 |
> |
* @throws IllegalArgumentException if the initial capacity of |
837 |
> |
* elements is negative or the load factor is nonpositive |
838 |
> |
* |
839 |
> |
* @since 1.6 |
840 |
> |
*/ |
841 |
> |
public ConcurrentHashMap(int initialCapacity, float loadFactor) { |
842 |
> |
this(initialCapacity, loadFactor, 1); |
843 |
> |
} |
844 |
> |
|
845 |
> |
/** |
846 |
> |
* Creates a new, empty map with an initial table size based on |
847 |
> |
* the given number of elements ({@code initialCapacity}), initial |
848 |
> |
* table density ({@code loadFactor}), and number of concurrently |
849 |
> |
* updating threads ({@code concurrencyLevel}). |
850 |
> |
* |
851 |
> |
* @param initialCapacity the initial capacity. The implementation |
852 |
> |
* performs internal sizing to accommodate this many elements, |
853 |
> |
* given the specified load factor. |
854 |
> |
* @param loadFactor the load factor (table density) for |
855 |
> |
* establishing the initial table size |
856 |
> |
* @param concurrencyLevel the estimated number of concurrently |
857 |
> |
* updating threads. The implementation may use this value as |
858 |
> |
* a sizing hint. |
859 |
> |
* @throws IllegalArgumentException if the initial capacity is |
860 |
> |
* negative or the load factor or concurrencyLevel are |
861 |
> |
* nonpositive |
862 |
> |
*/ |
863 |
> |
public ConcurrentHashMap(int initialCapacity, |
864 |
> |
float loadFactor, int concurrencyLevel) { |
865 |
> |
if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0) |
866 |
> |
throw new IllegalArgumentException(); |
867 |
> |
if (initialCapacity < concurrencyLevel) // Use at least as many bins |
868 |
> |
initialCapacity = concurrencyLevel; // as estimated threads |
869 |
> |
long size = (long)(1.0 + (long)initialCapacity / loadFactor); |
870 |
> |
int cap = (size >= (long)MAXIMUM_CAPACITY) ? |
871 |
> |
MAXIMUM_CAPACITY : tableSizeFor((int)size); |
872 |
> |
this.sizeCtl = cap; |
873 |
> |
} |
874 |
> |
|
875 |
> |
// Original (since JDK1.2) Map methods |
876 |
> |
|
877 |
> |
/** |
878 |
> |
* {@inheritDoc} |
879 |
> |
*/ |
880 |
> |
public int size() { |
881 |
> |
long n = sumCount(); |
882 |
> |
return ((n < 0L) ? 0 : |
883 |
> |
(n > (long)Integer.MAX_VALUE) ? Integer.MAX_VALUE : |
884 |
> |
(int)n); |
885 |
> |
} |
886 |
> |
|
887 |
> |
/** |
888 |
> |
* {@inheritDoc} |
889 |
> |
*/ |
890 |
> |
public boolean isEmpty() { |
891 |
> |
return sumCount() <= 0L; // ignore transient negative values |
892 |
> |
} |
893 |
> |
|
894 |
> |
/** |
895 |
> |
* Returns the value to which the specified key is mapped, |
896 |
> |
* or {@code null} if this map contains no mapping for the key. |
897 |
> |
* |
898 |
> |
* <p>More formally, if this map contains a mapping from a key |
899 |
> |
* {@code k} to a value {@code v} such that {@code key.equals(k)}, |
900 |
> |
* then this method returns {@code v}; otherwise it returns |
901 |
> |
* {@code null}. (There can be at most one such mapping.) |
902 |
> |
* |
903 |
> |
* @throws NullPointerException if the specified key is null |
904 |
> |
*/ |
905 |
> |
public V get(Object key) { |
906 |
> |
Node<K,V>[] tab; Node<K,V> e, p; int n, eh; K ek; |
907 |
> |
int h = spread(key.hashCode()); |
908 |
> |
if ((tab = table) != null && (n = tab.length) > 0 && |
909 |
> |
(e = tabAt(tab, (n - 1) & h)) != null) { |
910 |
> |
if ((eh = e.hash) == h) { |
911 |
> |
if ((ek = e.key) == key || (ek != null && key.equals(ek))) |
912 |
> |
return e.val; |
913 |
> |
} |
914 |
> |
else if (eh < 0) |
915 |
> |
return (p = e.find(h, key)) != null ? p.val : null; |
916 |
> |
while ((e = e.next) != null) { |
917 |
> |
if (e.hash == h && |
918 |
> |
((ek = e.key) == key || (ek != null && key.equals(ek)))) |
919 |
> |
return e.val; |
920 |
|
} |
921 |
|
} |
922 |
+ |
return null; |
923 |
+ |
} |
924 |
|
|
925 |
< |
V replace(K key, int hash, V newValue) { |
926 |
< |
lock(); |
927 |
< |
try { |
928 |
< |
HashEntry<K,V> e = getFirst(hash); |
929 |
< |
while (e != null && (e.hash != hash || !key.equals(e.key))) |
930 |
< |
e = e.next; |
931 |
< |
|
932 |
< |
V oldValue = null; |
933 |
< |
if (e != null) { |
934 |
< |
oldValue = e.value; |
935 |
< |
e.value = newValue; |
936 |
< |
} |
937 |
< |
return oldValue; |
938 |
< |
} finally { |
939 |
< |
unlock(); |
925 |
> |
/** |
926 |
> |
* Tests if the specified object is a key in this table. |
927 |
> |
* |
928 |
> |
* @param key possible key |
929 |
> |
* @return {@code true} if and only if the specified object |
930 |
> |
* is a key in this table, as determined by the |
931 |
> |
* {@code equals} method; {@code false} otherwise |
932 |
> |
* @throws NullPointerException if the specified key is null |
933 |
> |
*/ |
934 |
> |
public boolean containsKey(Object key) { |
935 |
> |
return get(key) != null; |
936 |
> |
} |
937 |
> |
|
938 |
> |
/** |
939 |
> |
* Returns {@code true} if this map maps one or more keys to the |
940 |
> |
* specified value. Note: This method may require a full traversal |
941 |
> |
* of the map, and is much slower than method {@code containsKey}. |
942 |
> |
* |
943 |
> |
* @param value value whose presence in this map is to be tested |
944 |
> |
* @return {@code true} if this map maps one or more keys to the |
945 |
> |
* specified value |
946 |
> |
* @throws NullPointerException if the specified value is null |
947 |
> |
*/ |
948 |
> |
public boolean containsValue(Object value) { |
949 |
> |
if (value == null) |
950 |
> |
throw new NullPointerException(); |
951 |
> |
Node<K,V>[] t; |
952 |
> |
if ((t = table) != null) { |
953 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
954 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) { |
955 |
> |
V v; |
956 |
> |
if ((v = p.val) == value || (v != null && value.equals(v))) |
957 |
> |
return true; |
958 |
|
} |
959 |
|
} |
960 |
+ |
return false; |
961 |
+ |
} |
962 |
|
|
963 |
+ |
/** |
964 |
+ |
* Maps the specified key to the specified value in this table. |
965 |
+ |
* Neither the key nor the value can be null. |
966 |
+ |
* |
967 |
+ |
* <p>The value can be retrieved by calling the {@code get} method |
968 |
+ |
* with a key that is equal to the original key. |
969 |
+ |
* |
970 |
+ |
* @param key key with which the specified value is to be associated |
971 |
+ |
* @param value value to be associated with the specified key |
972 |
+ |
* @return the previous value associated with {@code key}, or |
973 |
+ |
* {@code null} if there was no mapping for {@code key} |
974 |
+ |
* @throws NullPointerException if the specified key or value is null |
975 |
+ |
*/ |
976 |
+ |
public V put(K key, V value) { |
977 |
+ |
return putVal(key, value, false); |
978 |
+ |
} |
979 |
|
|
980 |
< |
V put(K key, int hash, V value, boolean onlyIfAbsent) { |
981 |
< |
lock(); |
982 |
< |
try { |
983 |
< |
int c = count; |
984 |
< |
if (c++ > threshold) // ensure capacity |
985 |
< |
rehash(); |
986 |
< |
HashEntry<K,V>[] tab = table; |
987 |
< |
int index = hash & (tab.length - 1); |
988 |
< |
HashEntry<K,V> first = tab[index]; |
989 |
< |
HashEntry<K,V> e = first; |
990 |
< |
while (e != null && (e.hash != hash || !key.equals(e.key))) |
991 |
< |
e = e.next; |
992 |
< |
|
993 |
< |
V oldValue; |
994 |
< |
if (e != null) { |
995 |
< |
oldValue = e.value; |
996 |
< |
if (!onlyIfAbsent) |
997 |
< |
e.value = value; |
980 |
> |
/** Implementation for put and putIfAbsent */ |
981 |
> |
final V putVal(K key, V value, boolean onlyIfAbsent) { |
982 |
> |
if (key == null || value == null) throw new NullPointerException(); |
983 |
> |
int hash = spread(key.hashCode()); |
984 |
> |
int binCount = 0; |
985 |
> |
for (Node<K,V>[] tab = table;;) { |
986 |
> |
Node<K,V> f; int n, i, fh; K fk; V fv; |
987 |
> |
if (tab == null || (n = tab.length) == 0) |
988 |
> |
tab = initTable(); |
989 |
> |
else if ((f = tabAt(tab, i = (n - 1) & hash)) == null) { |
990 |
> |
if (casTabAt(tab, i, null, new Node<K,V>(hash, key, value))) |
991 |
> |
break; // no lock when adding to empty bin |
992 |
> |
} |
993 |
> |
else if ((fh = f.hash) == MOVED) |
994 |
> |
tab = helpTransfer(tab, f); |
995 |
> |
else if (onlyIfAbsent // check first node without acquiring lock |
996 |
> |
&& fh == hash |
997 |
> |
&& ((fk = f.key) == key || (fk != null && key.equals(fk))) |
998 |
> |
&& (fv = f.val) != null) |
999 |
> |
return fv; |
1000 |
> |
else { |
1001 |
> |
V oldVal = null; |
1002 |
> |
synchronized (f) { |
1003 |
> |
if (tabAt(tab, i) == f) { |
1004 |
> |
if (fh >= 0) { |
1005 |
> |
binCount = 1; |
1006 |
> |
for (Node<K,V> e = f;; ++binCount) { |
1007 |
> |
K ek; |
1008 |
> |
if (e.hash == hash && |
1009 |
> |
((ek = e.key) == key || |
1010 |
> |
(ek != null && key.equals(ek)))) { |
1011 |
> |
oldVal = e.val; |
1012 |
> |
if (!onlyIfAbsent) |
1013 |
> |
e.val = value; |
1014 |
> |
break; |
1015 |
> |
} |
1016 |
> |
Node<K,V> pred = e; |
1017 |
> |
if ((e = e.next) == null) { |
1018 |
> |
pred.next = new Node<K,V>(hash, key, value); |
1019 |
> |
break; |
1020 |
> |
} |
1021 |
> |
} |
1022 |
> |
} |
1023 |
> |
else if (f instanceof TreeBin) { |
1024 |
> |
Node<K,V> p; |
1025 |
> |
binCount = 2; |
1026 |
> |
if ((p = ((TreeBin<K,V>)f).putTreeVal(hash, key, |
1027 |
> |
value)) != null) { |
1028 |
> |
oldVal = p.val; |
1029 |
> |
if (!onlyIfAbsent) |
1030 |
> |
p.val = value; |
1031 |
> |
} |
1032 |
> |
} |
1033 |
> |
else if (f instanceof ReservationNode) |
1034 |
> |
throw new IllegalStateException("Recursive update"); |
1035 |
> |
} |
1036 |
|
} |
1037 |
< |
else { |
1038 |
< |
oldValue = null; |
1039 |
< |
++modCount; |
1040 |
< |
tab[index] = new HashEntry<K,V>(key, hash, first, value); |
1041 |
< |
count = c; // write-volatile |
1037 |
> |
if (binCount != 0) { |
1038 |
> |
if (binCount >= TREEIFY_THRESHOLD) |
1039 |
> |
treeifyBin(tab, i); |
1040 |
> |
if (oldVal != null) |
1041 |
> |
return oldVal; |
1042 |
> |
break; |
1043 |
|
} |
437 |
– |
return oldValue; |
438 |
– |
} finally { |
439 |
– |
unlock(); |
1044 |
|
} |
1045 |
|
} |
1046 |
+ |
addCount(1L, binCount); |
1047 |
+ |
return null; |
1048 |
+ |
} |
1049 |
|
|
1050 |
< |
void rehash() { |
1051 |
< |
HashEntry<K,V>[] oldTable = table; |
1052 |
< |
int oldCapacity = oldTable.length; |
1053 |
< |
if (oldCapacity >= MAXIMUM_CAPACITY) |
1054 |
< |
return; |
1050 |
> |
/** |
1051 |
> |
* Copies all of the mappings from the specified map to this one. |
1052 |
> |
* These mappings replace any mappings that this map had for any of the |
1053 |
> |
* keys currently in the specified map. |
1054 |
> |
* |
1055 |
> |
* @param m mappings to be stored in this map |
1056 |
> |
*/ |
1057 |
> |
public void putAll(Map<? extends K, ? extends V> m) { |
1058 |
> |
tryPresize(m.size()); |
1059 |
> |
for (Map.Entry<? extends K, ? extends V> e : m.entrySet()) |
1060 |
> |
putVal(e.getKey(), e.getValue(), false); |
1061 |
> |
} |
1062 |
|
|
1063 |
< |
/* |
1064 |
< |
* Reclassify nodes in each list to new Map. Because we are |
1065 |
< |
* using power-of-two expansion, the elements from each bin |
1066 |
< |
* must either stay at same index, or move with a power of two |
1067 |
< |
* offset. We eliminate unnecessary node creation by catching |
1068 |
< |
* cases where old nodes can be reused because their next |
1069 |
< |
* fields won't change. Statistically, at the default |
1070 |
< |
* threshold, only about one-sixth of them need cloning when |
1071 |
< |
* a table doubles. The nodes they replace will be garbage |
1072 |
< |
* collectable as soon as they are no longer referenced by any |
1073 |
< |
* reader thread that may be in the midst of traversing table |
1074 |
< |
* right now. |
461 |
< |
*/ |
462 |
< |
|
463 |
< |
HashEntry<K,V>[] newTable = HashEntry.newArray(oldCapacity<<1); |
464 |
< |
threshold = (int)(newTable.length * loadFactor); |
465 |
< |
int sizeMask = newTable.length - 1; |
466 |
< |
for (int i = 0; i < oldCapacity ; i++) { |
467 |
< |
// We need to guarantee that any existing reads of old Map can |
468 |
< |
// proceed. So we cannot yet null out each bin. |
469 |
< |
HashEntry<K,V> e = oldTable[i]; |
470 |
< |
|
471 |
< |
if (e != null) { |
472 |
< |
HashEntry<K,V> next = e.next; |
473 |
< |
int idx = e.hash & sizeMask; |
474 |
< |
|
475 |
< |
// Single node on list |
476 |
< |
if (next == null) |
477 |
< |
newTable[idx] = e; |
1063 |
> |
/** |
1064 |
> |
* Removes the key (and its corresponding value) from this map. |
1065 |
> |
* This method does nothing if the key is not in the map. |
1066 |
> |
* |
1067 |
> |
* @param key the key that needs to be removed |
1068 |
> |
* @return the previous value associated with {@code key}, or |
1069 |
> |
* {@code null} if there was no mapping for {@code key} |
1070 |
> |
* @throws NullPointerException if the specified key is null |
1071 |
> |
*/ |
1072 |
> |
public V remove(Object key) { |
1073 |
> |
return replaceNode(key, null, null); |
1074 |
> |
} |
1075 |
|
|
1076 |
< |
else { |
1077 |
< |
// Reuse trailing consecutive sequence at same slot |
1078 |
< |
HashEntry<K,V> lastRun = e; |
1079 |
< |
int lastIdx = idx; |
1080 |
< |
for (HashEntry<K,V> last = next; |
1081 |
< |
last != null; |
1082 |
< |
last = last.next) { |
1083 |
< |
int k = last.hash & sizeMask; |
1084 |
< |
if (k != lastIdx) { |
1085 |
< |
lastIdx = k; |
1086 |
< |
lastRun = last; |
1076 |
> |
/** |
1077 |
> |
* Implementation for the four public remove/replace methods: |
1078 |
> |
* Replaces node value with v, conditional upon match of cv if |
1079 |
> |
* non-null. If resulting value is null, delete. |
1080 |
> |
*/ |
1081 |
> |
final V replaceNode(Object key, V value, Object cv) { |
1082 |
> |
int hash = spread(key.hashCode()); |
1083 |
> |
for (Node<K,V>[] tab = table;;) { |
1084 |
> |
Node<K,V> f; int n, i, fh; |
1085 |
> |
if (tab == null || (n = tab.length) == 0 || |
1086 |
> |
(f = tabAt(tab, i = (n - 1) & hash)) == null) |
1087 |
> |
break; |
1088 |
> |
else if ((fh = f.hash) == MOVED) |
1089 |
> |
tab = helpTransfer(tab, f); |
1090 |
> |
else { |
1091 |
> |
V oldVal = null; |
1092 |
> |
boolean validated = false; |
1093 |
> |
synchronized (f) { |
1094 |
> |
if (tabAt(tab, i) == f) { |
1095 |
> |
if (fh >= 0) { |
1096 |
> |
validated = true; |
1097 |
> |
for (Node<K,V> e = f, pred = null;;) { |
1098 |
> |
K ek; |
1099 |
> |
if (e.hash == hash && |
1100 |
> |
((ek = e.key) == key || |
1101 |
> |
(ek != null && key.equals(ek)))) { |
1102 |
> |
V ev = e.val; |
1103 |
> |
if (cv == null || cv == ev || |
1104 |
> |
(ev != null && cv.equals(ev))) { |
1105 |
> |
oldVal = ev; |
1106 |
> |
if (value != null) |
1107 |
> |
e.val = value; |
1108 |
> |
else if (pred != null) |
1109 |
> |
pred.next = e.next; |
1110 |
> |
else |
1111 |
> |
setTabAt(tab, i, e.next); |
1112 |
> |
} |
1113 |
> |
break; |
1114 |
> |
} |
1115 |
> |
pred = e; |
1116 |
> |
if ((e = e.next) == null) |
1117 |
> |
break; |
1118 |
|
} |
1119 |
|
} |
1120 |
< |
newTable[lastIdx] = lastRun; |
1121 |
< |
|
1122 |
< |
// Clone all remaining nodes |
1123 |
< |
for (HashEntry<K,V> p = e; p != lastRun; p = p.next) { |
1124 |
< |
int k = p.hash & sizeMask; |
1125 |
< |
HashEntry<K,V> n = newTable[k]; |
1126 |
< |
newTable[k] = new HashEntry<K,V>(p.key, p.hash, |
1127 |
< |
n, p.value); |
1120 |
> |
else if (f instanceof TreeBin) { |
1121 |
> |
validated = true; |
1122 |
> |
TreeBin<K,V> t = (TreeBin<K,V>)f; |
1123 |
> |
TreeNode<K,V> r, p; |
1124 |
> |
if ((r = t.root) != null && |
1125 |
> |
(p = r.findTreeNode(hash, key, null)) != null) { |
1126 |
> |
V pv = p.val; |
1127 |
> |
if (cv == null || cv == pv || |
1128 |
> |
(pv != null && cv.equals(pv))) { |
1129 |
> |
oldVal = pv; |
1130 |
> |
if (value != null) |
1131 |
> |
p.val = value; |
1132 |
> |
else if (t.removeTreeNode(p)) |
1133 |
> |
setTabAt(tab, i, untreeify(t.first)); |
1134 |
> |
} |
1135 |
> |
} |
1136 |
|
} |
1137 |
+ |
else if (f instanceof ReservationNode) |
1138 |
+ |
throw new IllegalStateException("Recursive update"); |
1139 |
|
} |
1140 |
|
} |
1141 |
< |
} |
1142 |
< |
table = newTable; |
1143 |
< |
} |
1144 |
< |
|
1145 |
< |
/** |
508 |
< |
* Remove; match on key only if value null, else match both. |
509 |
< |
*/ |
510 |
< |
V remove(Object key, int hash, Object value) { |
511 |
< |
lock(); |
512 |
< |
try { |
513 |
< |
int c = count - 1; |
514 |
< |
HashEntry<K,V>[] tab = table; |
515 |
< |
int index = hash & (tab.length - 1); |
516 |
< |
HashEntry<K,V> first = tab[index]; |
517 |
< |
HashEntry<K,V> e = first; |
518 |
< |
while (e != null && (e.hash != hash || !key.equals(e.key))) |
519 |
< |
e = e.next; |
520 |
< |
|
521 |
< |
V oldValue = null; |
522 |
< |
if (e != null) { |
523 |
< |
V v = e.value; |
524 |
< |
if (value == null || value.equals(v)) { |
525 |
< |
oldValue = v; |
526 |
< |
// All entries following removed node can stay |
527 |
< |
// in list, but all preceding ones need to be |
528 |
< |
// cloned. |
529 |
< |
++modCount; |
530 |
< |
HashEntry<K,V> newFirst = e.next; |
531 |
< |
for (HashEntry<K,V> p = first; p != e; p = p.next) |
532 |
< |
newFirst = new HashEntry<K,V>(p.key, p.hash, |
533 |
< |
newFirst, p.value); |
534 |
< |
tab[index] = newFirst; |
535 |
< |
count = c; // write-volatile |
1141 |
> |
if (validated) { |
1142 |
> |
if (oldVal != null) { |
1143 |
> |
if (value == null) |
1144 |
> |
addCount(-1L, -1); |
1145 |
> |
return oldVal; |
1146 |
|
} |
1147 |
+ |
break; |
1148 |
|
} |
538 |
– |
return oldValue; |
539 |
– |
} finally { |
540 |
– |
unlock(); |
1149 |
|
} |
1150 |
|
} |
1151 |
+ |
return null; |
1152 |
+ |
} |
1153 |
|
|
1154 |
< |
void clear() { |
1155 |
< |
if (count != 0) { |
1156 |
< |
lock(); |
1157 |
< |
try { |
1158 |
< |
HashEntry<K,V>[] tab = table; |
1159 |
< |
for (int i = 0; i < tab.length ; i++) |
1160 |
< |
tab[i] = null; |
1161 |
< |
++modCount; |
1162 |
< |
count = 0; // write-volatile |
1163 |
< |
} finally { |
1164 |
< |
unlock(); |
1154 |
> |
/** |
1155 |
> |
* Removes all of the mappings from this map. |
1156 |
> |
*/ |
1157 |
> |
public void clear() { |
1158 |
> |
long delta = 0L; // negative number of deletions |
1159 |
> |
int i = 0; |
1160 |
> |
Node<K,V>[] tab = table; |
1161 |
> |
while (tab != null && i < tab.length) { |
1162 |
> |
int fh; |
1163 |
> |
Node<K,V> f = tabAt(tab, i); |
1164 |
> |
if (f == null) |
1165 |
> |
++i; |
1166 |
> |
else if ((fh = f.hash) == MOVED) { |
1167 |
> |
tab = helpTransfer(tab, f); |
1168 |
> |
i = 0; // restart |
1169 |
> |
} |
1170 |
> |
else { |
1171 |
> |
synchronized (f) { |
1172 |
> |
if (tabAt(tab, i) == f) { |
1173 |
> |
Node<K,V> p = (fh >= 0 ? f : |
1174 |
> |
(f instanceof TreeBin) ? |
1175 |
> |
((TreeBin<K,V>)f).first : null); |
1176 |
> |
while (p != null) { |
1177 |
> |
--delta; |
1178 |
> |
p = p.next; |
1179 |
> |
} |
1180 |
> |
setTabAt(tab, i++, null); |
1181 |
> |
} |
1182 |
|
} |
1183 |
|
} |
1184 |
|
} |
1185 |
+ |
if (delta != 0L) |
1186 |
+ |
addCount(delta, -1); |
1187 |
|
} |
1188 |
|
|
1189 |
+ |
/** |
1190 |
+ |
* Returns a {@link Set} view of the keys contained in this map. |
1191 |
+ |
* The set is backed by the map, so changes to the map are |
1192 |
+ |
* reflected in the set, and vice-versa. The set supports element |
1193 |
+ |
* removal, which removes the corresponding mapping from this map, |
1194 |
+ |
* via the {@code Iterator.remove}, {@code Set.remove}, |
1195 |
+ |
* {@code removeAll}, {@code retainAll}, and {@code clear} |
1196 |
+ |
* operations. It does not support the {@code add} or |
1197 |
+ |
* {@code addAll} operations. |
1198 |
+ |
* |
1199 |
+ |
* <p>The view's iterators and spliterators are |
1200 |
+ |
* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>. |
1201 |
+ |
* |
1202 |
+ |
* <p>The view's {@code spliterator} reports {@link Spliterator#CONCURRENT}, |
1203 |
+ |
* {@link Spliterator#DISTINCT}, and {@link Spliterator#NONNULL}. |
1204 |
+ |
* |
1205 |
+ |
* @return the set view |
1206 |
+ |
*/ |
1207 |
+ |
public KeySetView<K,V> keySet() { |
1208 |
+ |
KeySetView<K,V> ks; |
1209 |
+ |
if ((ks = keySet) != null) return ks; |
1210 |
+ |
return keySet = new KeySetView<K,V>(this, null); |
1211 |
+ |
} |
1212 |
|
|
1213 |
+ |
/** |
1214 |
+ |
* Returns a {@link Collection} view of the values contained in this map. |
1215 |
+ |
* The collection is backed by the map, so changes to the map are |
1216 |
+ |
* reflected in the collection, and vice-versa. The collection |
1217 |
+ |
* supports element removal, which removes the corresponding |
1218 |
+ |
* mapping from this map, via the {@code Iterator.remove}, |
1219 |
+ |
* {@code Collection.remove}, {@code removeAll}, |
1220 |
+ |
* {@code retainAll}, and {@code clear} operations. It does not |
1221 |
+ |
* support the {@code add} or {@code addAll} operations. |
1222 |
+ |
* |
1223 |
+ |
* <p>The view's iterators and spliterators are |
1224 |
+ |
* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>. |
1225 |
+ |
* |
1226 |
+ |
* <p>The view's {@code spliterator} reports {@link Spliterator#CONCURRENT} |
1227 |
+ |
* and {@link Spliterator#NONNULL}. |
1228 |
+ |
* |
1229 |
+ |
* @return the collection view |
1230 |
+ |
*/ |
1231 |
+ |
public Collection<V> values() { |
1232 |
+ |
ValuesView<K,V> vs; |
1233 |
+ |
if ((vs = values) != null) return vs; |
1234 |
+ |
return values = new ValuesView<K,V>(this); |
1235 |
+ |
} |
1236 |
|
|
1237 |
< |
/* ---------------- Public operations -------------- */ |
1237 |
> |
/** |
1238 |
> |
* Returns a {@link Set} view of the mappings contained in this map. |
1239 |
> |
* The set is backed by the map, so changes to the map are |
1240 |
> |
* reflected in the set, and vice-versa. The set supports element |
1241 |
> |
* removal, which removes the corresponding mapping from the map, |
1242 |
> |
* via the {@code Iterator.remove}, {@code Set.remove}, |
1243 |
> |
* {@code removeAll}, {@code retainAll}, and {@code clear} |
1244 |
> |
* operations. |
1245 |
> |
* |
1246 |
> |
* <p>The view's iterators and spliterators are |
1247 |
> |
* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>. |
1248 |
> |
* |
1249 |
> |
* <p>The view's {@code spliterator} reports {@link Spliterator#CONCURRENT}, |
1250 |
> |
* {@link Spliterator#DISTINCT}, and {@link Spliterator#NONNULL}. |
1251 |
> |
* |
1252 |
> |
* @return the set view |
1253 |
> |
*/ |
1254 |
> |
public Set<Map.Entry<K,V>> entrySet() { |
1255 |
> |
EntrySetView<K,V> es; |
1256 |
> |
if ((es = entrySet) != null) return es; |
1257 |
> |
return entrySet = new EntrySetView<K,V>(this); |
1258 |
> |
} |
1259 |
|
|
1260 |
|
/** |
1261 |
< |
* Creates a new, empty map with the specified initial |
1262 |
< |
* capacity, load factor and concurrency level. |
1261 |
> |
* Returns the hash code value for this {@link Map}, i.e., |
1262 |
> |
* the sum of, for each key-value pair in the map, |
1263 |
> |
* {@code key.hashCode() ^ value.hashCode()}. |
1264 |
|
* |
1265 |
< |
* @param initialCapacity the initial capacity. The implementation |
569 |
< |
* performs internal sizing to accommodate this many elements. |
570 |
< |
* @param loadFactor the load factor threshold, used to control resizing. |
571 |
< |
* Resizing may be performed when the average number of elements per |
572 |
< |
* bin exceeds this threshold. |
573 |
< |
* @param concurrencyLevel the estimated number of concurrently |
574 |
< |
* updating threads. The implementation performs internal sizing |
575 |
< |
* to try to accommodate this many threads. |
576 |
< |
* @throws IllegalArgumentException if the initial capacity is |
577 |
< |
* negative or the load factor or concurrencyLevel are |
578 |
< |
* nonpositive. |
1265 |
> |
* @return the hash code value for this map |
1266 |
|
*/ |
1267 |
< |
public ConcurrentHashMap(int initialCapacity, |
1268 |
< |
float loadFactor, int concurrencyLevel) { |
1269 |
< |
if (!(loadFactor > 0) || initialCapacity < 0 || concurrencyLevel <= 0) |
1270 |
< |
throw new IllegalArgumentException(); |
1267 |
> |
public int hashCode() { |
1268 |
> |
int h = 0; |
1269 |
> |
Node<K,V>[] t; |
1270 |
> |
if ((t = table) != null) { |
1271 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
1272 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) |
1273 |
> |
h += p.key.hashCode() ^ p.val.hashCode(); |
1274 |
> |
} |
1275 |
> |
return h; |
1276 |
> |
} |
1277 |
> |
|
1278 |
> |
/** |
1279 |
> |
* Returns a string representation of this map. The string |
1280 |
> |
* representation consists of a list of key-value mappings (in no |
1281 |
> |
* particular order) enclosed in braces ("{@code {}}"). Adjacent |
1282 |
> |
* mappings are separated by the characters {@code ", "} (comma |
1283 |
> |
* and space). Each key-value mapping is rendered as the key |
1284 |
> |
* followed by an equals sign ("{@code =}") followed by the |
1285 |
> |
* associated value. |
1286 |
> |
* |
1287 |
> |
* @return a string representation of this map |
1288 |
> |
*/ |
1289 |
> |
public String toString() { |
1290 |
> |
Node<K,V>[] t; |
1291 |
> |
int f = (t = table) == null ? 0 : t.length; |
1292 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f); |
1293 |
> |
StringBuilder sb = new StringBuilder(); |
1294 |
> |
sb.append('{'); |
1295 |
> |
Node<K,V> p; |
1296 |
> |
if ((p = it.advance()) != null) { |
1297 |
> |
for (;;) { |
1298 |
> |
K k = p.key; |
1299 |
> |
V v = p.val; |
1300 |
> |
sb.append(k == this ? "(this Map)" : k); |
1301 |
> |
sb.append('='); |
1302 |
> |
sb.append(v == this ? "(this Map)" : v); |
1303 |
> |
if ((p = it.advance()) == null) |
1304 |
> |
break; |
1305 |
> |
sb.append(',').append(' '); |
1306 |
> |
} |
1307 |
> |
} |
1308 |
> |
return sb.append('}').toString(); |
1309 |
> |
} |
1310 |
> |
|
1311 |
> |
/** |
1312 |
> |
* Compares the specified object with this map for equality. |
1313 |
> |
* Returns {@code true} if the given object is a map with the same |
1314 |
> |
* mappings as this map. This operation may return misleading |
1315 |
> |
* results if either map is concurrently modified during execution |
1316 |
> |
* of this method. |
1317 |
> |
* |
1318 |
> |
* @param o object to be compared for equality with this map |
1319 |
> |
* @return {@code true} if the specified object is equal to this map |
1320 |
> |
*/ |
1321 |
> |
public boolean equals(Object o) { |
1322 |
> |
if (o != this) { |
1323 |
> |
if (!(o instanceof Map)) |
1324 |
> |
return false; |
1325 |
> |
Map<?,?> m = (Map<?,?>) o; |
1326 |
> |
Node<K,V>[] t; |
1327 |
> |
int f = (t = table) == null ? 0 : t.length; |
1328 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, f, 0, f); |
1329 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) { |
1330 |
> |
V val = p.val; |
1331 |
> |
Object v = m.get(p.key); |
1332 |
> |
if (v == null || (v != val && !v.equals(val))) |
1333 |
> |
return false; |
1334 |
> |
} |
1335 |
> |
for (Map.Entry<?,?> e : m.entrySet()) { |
1336 |
> |
Object mk, mv, v; |
1337 |
> |
if ((mk = e.getKey()) == null || |
1338 |
> |
(mv = e.getValue()) == null || |
1339 |
> |
(v = get(mk)) == null || |
1340 |
> |
(mv != v && !mv.equals(v))) |
1341 |
> |
return false; |
1342 |
> |
} |
1343 |
> |
} |
1344 |
> |
return true; |
1345 |
> |
} |
1346 |
|
|
1347 |
< |
if (concurrencyLevel > MAX_SEGMENTS) |
1348 |
< |
concurrencyLevel = MAX_SEGMENTS; |
1347 |
> |
/** |
1348 |
> |
* Stripped-down version of helper class used in previous version, |
1349 |
> |
* declared for the sake of serialization compatibility. |
1350 |
> |
*/ |
1351 |
> |
static class Segment<K,V> extends ReentrantLock implements Serializable { |
1352 |
> |
private static final long serialVersionUID = 2249069246763182397L; |
1353 |
> |
final float loadFactor; |
1354 |
> |
Segment(float lf) { this.loadFactor = lf; } |
1355 |
> |
} |
1356 |
|
|
1357 |
< |
// Find power-of-two sizes best matching arguments |
1357 |
> |
/** |
1358 |
> |
* Saves this map to a stream (that is, serializes it). |
1359 |
> |
* |
1360 |
> |
* @param s the stream |
1361 |
> |
* @throws java.io.IOException if an I/O error occurs |
1362 |
> |
* @serialData |
1363 |
> |
* the serialized fields, followed by the key (Object) and value |
1364 |
> |
* (Object) for each key-value mapping, followed by a null pair. |
1365 |
> |
* The key-value mappings are emitted in no particular order. |
1366 |
> |
*/ |
1367 |
> |
private void writeObject(java.io.ObjectOutputStream s) |
1368 |
> |
throws java.io.IOException { |
1369 |
> |
// For serialization compatibility |
1370 |
> |
// Emulate segment calculation from previous version of this class |
1371 |
|
int sshift = 0; |
1372 |
|
int ssize = 1; |
1373 |
< |
while (ssize < concurrencyLevel) { |
1373 |
> |
while (ssize < DEFAULT_CONCURRENCY_LEVEL) { |
1374 |
|
++sshift; |
1375 |
|
ssize <<= 1; |
1376 |
|
} |
1377 |
< |
segmentShift = 32 - sshift; |
1378 |
< |
segmentMask = ssize - 1; |
1379 |
< |
this.segments = Segment.newArray(ssize); |
1380 |
< |
|
1381 |
< |
if (initialCapacity > MAXIMUM_CAPACITY) |
1382 |
< |
initialCapacity = MAXIMUM_CAPACITY; |
1383 |
< |
int c = initialCapacity / ssize; |
1384 |
< |
if (c * ssize < initialCapacity) |
1385 |
< |
++c; |
1386 |
< |
int cap = 1; |
1387 |
< |
while (cap < c) |
1388 |
< |
cap <<= 1; |
1377 |
> |
int segmentShift = 32 - sshift; |
1378 |
> |
int segmentMask = ssize - 1; |
1379 |
> |
@SuppressWarnings("unchecked") |
1380 |
> |
Segment<K,V>[] segments = (Segment<K,V>[]) |
1381 |
> |
new Segment<?,?>[DEFAULT_CONCURRENCY_LEVEL]; |
1382 |
> |
for (int i = 0; i < segments.length; ++i) |
1383 |
> |
segments[i] = new Segment<K,V>(LOAD_FACTOR); |
1384 |
> |
java.io.ObjectOutputStream.PutField streamFields = s.putFields(); |
1385 |
> |
streamFields.put("segments", segments); |
1386 |
> |
streamFields.put("segmentShift", segmentShift); |
1387 |
> |
streamFields.put("segmentMask", segmentMask); |
1388 |
> |
s.writeFields(); |
1389 |
> |
|
1390 |
> |
Node<K,V>[] t; |
1391 |
> |
if ((t = table) != null) { |
1392 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
1393 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) { |
1394 |
> |
s.writeObject(p.key); |
1395 |
> |
s.writeObject(p.val); |
1396 |
> |
} |
1397 |
> |
} |
1398 |
> |
s.writeObject(null); |
1399 |
> |
s.writeObject(null); |
1400 |
> |
} |
1401 |
|
|
1402 |
< |
for (int i = 0; i < this.segments.length; ++i) |
1403 |
< |
this.segments[i] = new Segment<K,V>(cap, loadFactor); |
1402 |
> |
/** |
1403 |
> |
* Reconstitutes this map from a stream (that is, deserializes it). |
1404 |
> |
* @param s the stream |
1405 |
> |
* @throws ClassNotFoundException if the class of a serialized object |
1406 |
> |
* could not be found |
1407 |
> |
* @throws java.io.IOException if an I/O error occurs |
1408 |
> |
*/ |
1409 |
> |
private void readObject(java.io.ObjectInputStream s) |
1410 |
> |
throws java.io.IOException, ClassNotFoundException { |
1411 |
> |
/* |
1412 |
> |
* To improve performance in typical cases, we create nodes |
1413 |
> |
* while reading, then place in table once size is known. |
1414 |
> |
* However, we must also validate uniqueness and deal with |
1415 |
> |
* overpopulated bins while doing so, which requires |
1416 |
> |
* specialized versions of putVal mechanics. |
1417 |
> |
*/ |
1418 |
> |
sizeCtl = -1; // force exclusion for table construction |
1419 |
> |
s.defaultReadObject(); |
1420 |
> |
long size = 0L; |
1421 |
> |
Node<K,V> p = null; |
1422 |
> |
for (;;) { |
1423 |
> |
@SuppressWarnings("unchecked") |
1424 |
> |
K k = (K) s.readObject(); |
1425 |
> |
@SuppressWarnings("unchecked") |
1426 |
> |
V v = (V) s.readObject(); |
1427 |
> |
if (k != null && v != null) { |
1428 |
> |
p = new Node<K,V>(spread(k.hashCode()), k, v, p); |
1429 |
> |
++size; |
1430 |
> |
} |
1431 |
> |
else |
1432 |
> |
break; |
1433 |
> |
} |
1434 |
> |
if (size == 0L) |
1435 |
> |
sizeCtl = 0; |
1436 |
> |
else { |
1437 |
> |
long ts = (long)(1.0 + size / LOAD_FACTOR); |
1438 |
> |
int n = (ts >= (long)MAXIMUM_CAPACITY) ? |
1439 |
> |
MAXIMUM_CAPACITY : tableSizeFor((int)ts); |
1440 |
> |
@SuppressWarnings("unchecked") |
1441 |
> |
Node<K,V>[] tab = (Node<K,V>[])new Node<?,?>[n]; |
1442 |
> |
int mask = n - 1; |
1443 |
> |
long added = 0L; |
1444 |
> |
while (p != null) { |
1445 |
> |
boolean insertAtFront; |
1446 |
> |
Node<K,V> next = p.next, first; |
1447 |
> |
int h = p.hash, j = h & mask; |
1448 |
> |
if ((first = tabAt(tab, j)) == null) |
1449 |
> |
insertAtFront = true; |
1450 |
> |
else { |
1451 |
> |
K k = p.key; |
1452 |
> |
if (first.hash < 0) { |
1453 |
> |
TreeBin<K,V> t = (TreeBin<K,V>)first; |
1454 |
> |
if (t.putTreeVal(h, k, p.val) == null) |
1455 |
> |
++added; |
1456 |
> |
insertAtFront = false; |
1457 |
> |
} |
1458 |
> |
else { |
1459 |
> |
int binCount = 0; |
1460 |
> |
insertAtFront = true; |
1461 |
> |
Node<K,V> q; K qk; |
1462 |
> |
for (q = first; q != null; q = q.next) { |
1463 |
> |
if (q.hash == h && |
1464 |
> |
((qk = q.key) == k || |
1465 |
> |
(qk != null && k.equals(qk)))) { |
1466 |
> |
insertAtFront = false; |
1467 |
> |
break; |
1468 |
> |
} |
1469 |
> |
++binCount; |
1470 |
> |
} |
1471 |
> |
if (insertAtFront && binCount >= TREEIFY_THRESHOLD) { |
1472 |
> |
insertAtFront = false; |
1473 |
> |
++added; |
1474 |
> |
p.next = first; |
1475 |
> |
TreeNode<K,V> hd = null, tl = null; |
1476 |
> |
for (q = p; q != null; q = q.next) { |
1477 |
> |
TreeNode<K,V> t = new TreeNode<K,V> |
1478 |
> |
(q.hash, q.key, q.val, null, null); |
1479 |
> |
if ((t.prev = tl) == null) |
1480 |
> |
hd = t; |
1481 |
> |
else |
1482 |
> |
tl.next = t; |
1483 |
> |
tl = t; |
1484 |
> |
} |
1485 |
> |
setTabAt(tab, j, new TreeBin<K,V>(hd)); |
1486 |
> |
} |
1487 |
> |
} |
1488 |
> |
} |
1489 |
> |
if (insertAtFront) { |
1490 |
> |
++added; |
1491 |
> |
p.next = first; |
1492 |
> |
setTabAt(tab, j, p); |
1493 |
> |
} |
1494 |
> |
p = next; |
1495 |
> |
} |
1496 |
> |
table = tab; |
1497 |
> |
sizeCtl = n - (n >>> 2); |
1498 |
> |
baseCount = added; |
1499 |
> |
} |
1500 |
|
} |
1501 |
|
|
1502 |
+ |
// ConcurrentMap methods |
1503 |
+ |
|
1504 |
|
/** |
1505 |
< |
* Creates a new, empty map with the specified initial capacity |
614 |
< |
* and load factor and with the default concurrencyLevel (16). |
615 |
< |
* |
616 |
< |
* @param initialCapacity The implementation performs internal |
617 |
< |
* sizing to accommodate this many elements. |
618 |
< |
* @param loadFactor the load factor threshold, used to control resizing. |
619 |
< |
* Resizing may be performed when the average number of elements per |
620 |
< |
* bin exceeds this threshold. |
621 |
< |
* @throws IllegalArgumentException if the initial capacity of |
622 |
< |
* elements is negative or the load factor is nonpositive |
1505 |
> |
* {@inheritDoc} |
1506 |
|
* |
1507 |
< |
* @since 1.6 |
1507 |
> |
* @return the previous value associated with the specified key, |
1508 |
> |
* or {@code null} if there was no mapping for the key |
1509 |
> |
* @throws NullPointerException if the specified key or value is null |
1510 |
|
*/ |
1511 |
< |
public ConcurrentHashMap(int initialCapacity, float loadFactor) { |
1512 |
< |
this(initialCapacity, loadFactor, DEFAULT_CONCURRENCY_LEVEL); |
1511 |
> |
public V putIfAbsent(K key, V value) { |
1512 |
> |
return putVal(key, value, true); |
1513 |
|
} |
1514 |
|
|
1515 |
|
/** |
1516 |
< |
* Creates a new, empty map with the specified initial capacity, |
632 |
< |
* and with default load factor (0.75) and concurrencyLevel (16). |
1516 |
> |
* {@inheritDoc} |
1517 |
|
* |
1518 |
< |
* @param initialCapacity the initial capacity. The implementation |
635 |
< |
* performs internal sizing to accommodate this many elements. |
636 |
< |
* @throws IllegalArgumentException if the initial capacity of |
637 |
< |
* elements is negative. |
1518 |
> |
* @throws NullPointerException if the specified key is null |
1519 |
|
*/ |
1520 |
< |
public ConcurrentHashMap(int initialCapacity) { |
1521 |
< |
this(initialCapacity, DEFAULT_LOAD_FACTOR, DEFAULT_CONCURRENCY_LEVEL); |
1520 |
> |
public boolean remove(Object key, Object value) { |
1521 |
> |
if (key == null) |
1522 |
> |
throw new NullPointerException(); |
1523 |
> |
return value != null && replaceNode(key, null, value) != null; |
1524 |
|
} |
1525 |
|
|
1526 |
|
/** |
1527 |
< |
* Creates a new, empty map with a default initial capacity (16), |
1528 |
< |
* load factor (0.75) and concurrencyLevel (16). |
1527 |
> |
* {@inheritDoc} |
1528 |
> |
* |
1529 |
> |
* @throws NullPointerException if any of the arguments are null |
1530 |
|
*/ |
1531 |
< |
public ConcurrentHashMap() { |
1532 |
< |
this(DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_CONCURRENCY_LEVEL); |
1531 |
> |
public boolean replace(K key, V oldValue, V newValue) { |
1532 |
> |
if (key == null || oldValue == null || newValue == null) |
1533 |
> |
throw new NullPointerException(); |
1534 |
> |
return replaceNode(key, newValue, oldValue) != null; |
1535 |
|
} |
1536 |
|
|
1537 |
|
/** |
1538 |
< |
* Creates a new map with the same mappings as the given map. |
653 |
< |
* The map is created with a capacity of 1.5 times the number |
654 |
< |
* of mappings in the given map or 16 (whichever is greater), |
655 |
< |
* and a default load factor (0.75) and concurrencyLevel (16). |
1538 |
> |
* {@inheritDoc} |
1539 |
|
* |
1540 |
< |
* @param m the map |
1540 |
> |
* @return the previous value associated with the specified key, |
1541 |
> |
* or {@code null} if there was no mapping for the key |
1542 |
> |
* @throws NullPointerException if the specified key or value is null |
1543 |
|
*/ |
1544 |
< |
public ConcurrentHashMap(Map<? extends K, ? extends V> m) { |
1545 |
< |
this(Math.max((int) (m.size() / DEFAULT_LOAD_FACTOR) + 1, |
1546 |
< |
DEFAULT_INITIAL_CAPACITY), |
1547 |
< |
DEFAULT_LOAD_FACTOR, DEFAULT_CONCURRENCY_LEVEL); |
663 |
< |
putAll(m); |
1544 |
> |
public V replace(K key, V value) { |
1545 |
> |
if (key == null || value == null) |
1546 |
> |
throw new NullPointerException(); |
1547 |
> |
return replaceNode(key, value, null); |
1548 |
|
} |
1549 |
|
|
1550 |
+ |
// Overrides of JDK8+ Map extension method defaults |
1551 |
+ |
|
1552 |
|
/** |
1553 |
< |
* Returns <tt>true</tt> if this map contains no key-value mappings. |
1553 |
> |
* Returns the value to which the specified key is mapped, or the |
1554 |
> |
* given default value if this map contains no mapping for the |
1555 |
> |
* key. |
1556 |
|
* |
1557 |
< |
* @return <tt>true</tt> if this map contains no key-value mappings |
1557 |
> |
* @param key the key whose associated value is to be returned |
1558 |
> |
* @param defaultValue the value to return if this map contains |
1559 |
> |
* no mapping for the given key |
1560 |
> |
* @return the mapping for the key, if present; else the default value |
1561 |
> |
* @throws NullPointerException if the specified key is null |
1562 |
|
*/ |
1563 |
< |
public boolean isEmpty() { |
1564 |
< |
final Segment<K,V>[] segments = this.segments; |
1565 |
< |
/* |
1566 |
< |
* We keep track of per-segment modCounts to avoid ABA |
1567 |
< |
* problems in which an element in one segment was added and |
1568 |
< |
* in another removed during traversal, in which case the |
1569 |
< |
* table was never actually empty at any point. Note the |
1570 |
< |
* similar use of modCounts in the size() and containsValue() |
1571 |
< |
* methods, which are the only other methods also susceptible |
1572 |
< |
* to ABA problems. |
1573 |
< |
*/ |
1574 |
< |
int[] mc = new int[segments.length]; |
1575 |
< |
int mcsum = 0; |
684 |
< |
for (int i = 0; i < segments.length; ++i) { |
685 |
< |
if (segments[i].count != 0) |
686 |
< |
return false; |
687 |
< |
else |
688 |
< |
mcsum += mc[i] = segments[i].modCount; |
1563 |
> |
public V getOrDefault(Object key, V defaultValue) { |
1564 |
> |
V v; |
1565 |
> |
return (v = get(key)) == null ? defaultValue : v; |
1566 |
> |
} |
1567 |
> |
|
1568 |
> |
public void forEach(BiConsumer<? super K, ? super V> action) { |
1569 |
> |
if (action == null) throw new NullPointerException(); |
1570 |
> |
Node<K,V>[] t; |
1571 |
> |
if ((t = table) != null) { |
1572 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
1573 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) { |
1574 |
> |
action.accept(p.key, p.val); |
1575 |
> |
} |
1576 |
|
} |
1577 |
< |
// If mcsum happens to be zero, then we know we got a snapshot |
1578 |
< |
// before any modifications at all were made. This is |
1579 |
< |
// probably common enough to bother tracking. |
1580 |
< |
if (mcsum != 0) { |
1581 |
< |
for (int i = 0; i < segments.length; ++i) { |
1582 |
< |
if (segments[i].count != 0 || |
1583 |
< |
mc[i] != segments[i].modCount) |
1584 |
< |
return false; |
1577 |
> |
} |
1578 |
> |
|
1579 |
> |
public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) { |
1580 |
> |
if (function == null) throw new NullPointerException(); |
1581 |
> |
Node<K,V>[] t; |
1582 |
> |
if ((t = table) != null) { |
1583 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
1584 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) { |
1585 |
> |
V oldValue = p.val; |
1586 |
> |
for (K key = p.key;;) { |
1587 |
> |
V newValue = function.apply(key, oldValue); |
1588 |
> |
if (newValue == null) |
1589 |
> |
throw new NullPointerException(); |
1590 |
> |
if (replaceNode(key, newValue, oldValue) != null || |
1591 |
> |
(oldValue = get(key)) == null) |
1592 |
> |
break; |
1593 |
> |
} |
1594 |
|
} |
1595 |
|
} |
700 |
– |
return true; |
1596 |
|
} |
1597 |
|
|
1598 |
|
/** |
1599 |
< |
* Returns the number of key-value mappings in this map. If the |
705 |
< |
* map contains more than <tt>Integer.MAX_VALUE</tt> elements, returns |
706 |
< |
* <tt>Integer.MAX_VALUE</tt>. |
707 |
< |
* |
708 |
< |
* @return the number of key-value mappings in this map |
1599 |
> |
* Helper method for EntrySetView.removeIf. |
1600 |
|
*/ |
1601 |
< |
public int size() { |
1602 |
< |
final Segment<K,V>[] segments = this.segments; |
1603 |
< |
long sum = 0; |
1604 |
< |
long check = 0; |
1605 |
< |
int[] mc = new int[segments.length]; |
1606 |
< |
// Try a few times to get accurate count. On failure due to |
1607 |
< |
// continuous async changes in table, resort to locking. |
1608 |
< |
for (int k = 0; k < RETRIES_BEFORE_LOCK; ++k) { |
1609 |
< |
check = 0; |
1610 |
< |
sum = 0; |
1611 |
< |
int mcsum = 0; |
1612 |
< |
for (int i = 0; i < segments.length; ++i) { |
722 |
< |
sum += segments[i].count; |
723 |
< |
mcsum += mc[i] = segments[i].modCount; |
724 |
< |
} |
725 |
< |
if (mcsum != 0) { |
726 |
< |
for (int i = 0; i < segments.length; ++i) { |
727 |
< |
check += segments[i].count; |
728 |
< |
if (mc[i] != segments[i].modCount) { |
729 |
< |
check = -1; // force retry |
730 |
< |
break; |
731 |
< |
} |
732 |
< |
} |
1601 |
> |
boolean removeEntryIf(Predicate<? super Entry<K,V>> function) { |
1602 |
> |
if (function == null) throw new NullPointerException(); |
1603 |
> |
Node<K,V>[] t; |
1604 |
> |
boolean removed = false; |
1605 |
> |
if ((t = table) != null) { |
1606 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
1607 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) { |
1608 |
> |
K k = p.key; |
1609 |
> |
V v = p.val; |
1610 |
> |
Map.Entry<K,V> e = new AbstractMap.SimpleImmutableEntry<>(k, v); |
1611 |
> |
if (function.test(e) && replaceNode(k, null, v) != null) |
1612 |
> |
removed = true; |
1613 |
|
} |
734 |
– |
if (check == sum) |
735 |
– |
break; |
1614 |
|
} |
1615 |
< |
if (check != sum) { // Resort to locking all segments |
738 |
< |
sum = 0; |
739 |
< |
for (int i = 0; i < segments.length; ++i) |
740 |
< |
segments[i].lock(); |
741 |
< |
for (int i = 0; i < segments.length; ++i) |
742 |
< |
sum += segments[i].count; |
743 |
< |
for (int i = 0; i < segments.length; ++i) |
744 |
< |
segments[i].unlock(); |
745 |
< |
} |
746 |
< |
if (sum > Integer.MAX_VALUE) |
747 |
< |
return Integer.MAX_VALUE; |
748 |
< |
else |
749 |
< |
return (int)sum; |
1615 |
> |
return removed; |
1616 |
|
} |
1617 |
|
|
1618 |
|
/** |
1619 |
< |
* Returns the value to which this map maps the specified key, or |
754 |
< |
* <tt>null</tt> if the map contains no mapping for the key. |
755 |
< |
* |
756 |
< |
* @param key key whose associated value is to be returned |
757 |
< |
* @return the value to which this map maps the specified key, or |
758 |
< |
* <tt>null</tt> if the map contains no mapping for the key |
759 |
< |
* @throws NullPointerException if the specified key is null |
1619 |
> |
* Helper method for ValuesView.removeIf. |
1620 |
|
*/ |
1621 |
< |
public V get(Object key) { |
1622 |
< |
int hash = hash(key); // throws NullPointerException if key null |
1623 |
< |
return segmentFor(hash).get(key, hash); |
1621 |
> |
boolean removeValueIf(Predicate<? super V> function) { |
1622 |
> |
if (function == null) throw new NullPointerException(); |
1623 |
> |
Node<K,V>[] t; |
1624 |
> |
boolean removed = false; |
1625 |
> |
if ((t = table) != null) { |
1626 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
1627 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) { |
1628 |
> |
K k = p.key; |
1629 |
> |
V v = p.val; |
1630 |
> |
if (function.test(v) && replaceNode(k, null, v) != null) |
1631 |
> |
removed = true; |
1632 |
> |
} |
1633 |
> |
} |
1634 |
> |
return removed; |
1635 |
|
} |
1636 |
|
|
1637 |
|
/** |
1638 |
< |
* Tests if the specified object is a key in this table. |
1638 |
> |
* If the specified key is not already associated with a value, |
1639 |
> |
* attempts to compute its value using the given mapping function |
1640 |
> |
* and enters it into this map unless {@code null}. The entire |
1641 |
> |
* method invocation is performed atomically, so the function is |
1642 |
> |
* applied at most once per key. Some attempted update operations |
1643 |
> |
* on this map by other threads may be blocked while computation |
1644 |
> |
* is in progress, so the computation should be short and simple, |
1645 |
> |
* and must not attempt to update any other mappings of this map. |
1646 |
|
* |
1647 |
< |
* @param key possible key |
1648 |
< |
* @return <tt>true</tt> if and only if the specified object |
1649 |
< |
* is a key in this table, as determined by the |
1650 |
< |
* <tt>equals</tt> method; <tt>false</tt> otherwise. |
1651 |
< |
* @throws NullPointerException if the specified key is null |
1647 |
> |
* @param key key with which the specified value is to be associated |
1648 |
> |
* @param mappingFunction the function to compute a value |
1649 |
> |
* @return the current (existing or computed) value associated with |
1650 |
> |
* the specified key, or null if the computed value is null |
1651 |
> |
* @throws NullPointerException if the specified key or mappingFunction |
1652 |
> |
* is null |
1653 |
> |
* @throws IllegalStateException if the computation detectably |
1654 |
> |
* attempts a recursive update to this map that would |
1655 |
> |
* otherwise never complete |
1656 |
> |
* @throws RuntimeException or Error if the mappingFunction does so, |
1657 |
> |
* in which case the mapping is left unestablished |
1658 |
|
*/ |
1659 |
< |
public boolean containsKey(Object key) { |
1660 |
< |
int hash = hash(key); // throws NullPointerException if key null |
1661 |
< |
return segmentFor(hash).containsKey(key, hash); |
1659 |
> |
public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) { |
1660 |
> |
if (key == null || mappingFunction == null) |
1661 |
> |
throw new NullPointerException(); |
1662 |
> |
int h = spread(key.hashCode()); |
1663 |
> |
V val = null; |
1664 |
> |
int binCount = 0; |
1665 |
> |
for (Node<K,V>[] tab = table;;) { |
1666 |
> |
Node<K,V> f; int n, i, fh; K fk; V fv; |
1667 |
> |
if (tab == null || (n = tab.length) == 0) |
1668 |
> |
tab = initTable(); |
1669 |
> |
else if ((f = tabAt(tab, i = (n - 1) & h)) == null) { |
1670 |
> |
Node<K,V> r = new ReservationNode<K,V>(); |
1671 |
> |
synchronized (r) { |
1672 |
> |
if (casTabAt(tab, i, null, r)) { |
1673 |
> |
binCount = 1; |
1674 |
> |
Node<K,V> node = null; |
1675 |
> |
try { |
1676 |
> |
if ((val = mappingFunction.apply(key)) != null) |
1677 |
> |
node = new Node<K,V>(h, key, val); |
1678 |
> |
} finally { |
1679 |
> |
setTabAt(tab, i, node); |
1680 |
> |
} |
1681 |
> |
} |
1682 |
> |
} |
1683 |
> |
if (binCount != 0) |
1684 |
> |
break; |
1685 |
> |
} |
1686 |
> |
else if ((fh = f.hash) == MOVED) |
1687 |
> |
tab = helpTransfer(tab, f); |
1688 |
> |
else if (fh == h // check first node without acquiring lock |
1689 |
> |
&& ((fk = f.key) == key || (fk != null && key.equals(fk))) |
1690 |
> |
&& (fv = f.val) != null) |
1691 |
> |
return fv; |
1692 |
> |
else { |
1693 |
> |
boolean added = false; |
1694 |
> |
synchronized (f) { |
1695 |
> |
if (tabAt(tab, i) == f) { |
1696 |
> |
if (fh >= 0) { |
1697 |
> |
binCount = 1; |
1698 |
> |
for (Node<K,V> e = f;; ++binCount) { |
1699 |
> |
K ek; |
1700 |
> |
if (e.hash == h && |
1701 |
> |
((ek = e.key) == key || |
1702 |
> |
(ek != null && key.equals(ek)))) { |
1703 |
> |
val = e.val; |
1704 |
> |
break; |
1705 |
> |
} |
1706 |
> |
Node<K,V> pred = e; |
1707 |
> |
if ((e = e.next) == null) { |
1708 |
> |
if ((val = mappingFunction.apply(key)) != null) { |
1709 |
> |
if (pred.next != null) |
1710 |
> |
throw new IllegalStateException("Recursive update"); |
1711 |
> |
added = true; |
1712 |
> |
pred.next = new Node<K,V>(h, key, val); |
1713 |
> |
} |
1714 |
> |
break; |
1715 |
> |
} |
1716 |
> |
} |
1717 |
> |
} |
1718 |
> |
else if (f instanceof TreeBin) { |
1719 |
> |
binCount = 2; |
1720 |
> |
TreeBin<K,V> t = (TreeBin<K,V>)f; |
1721 |
> |
TreeNode<K,V> r, p; |
1722 |
> |
if ((r = t.root) != null && |
1723 |
> |
(p = r.findTreeNode(h, key, null)) != null) |
1724 |
> |
val = p.val; |
1725 |
> |
else if ((val = mappingFunction.apply(key)) != null) { |
1726 |
> |
added = true; |
1727 |
> |
t.putTreeVal(h, key, val); |
1728 |
> |
} |
1729 |
> |
} |
1730 |
> |
else if (f instanceof ReservationNode) |
1731 |
> |
throw new IllegalStateException("Recursive update"); |
1732 |
> |
} |
1733 |
> |
} |
1734 |
> |
if (binCount != 0) { |
1735 |
> |
if (binCount >= TREEIFY_THRESHOLD) |
1736 |
> |
treeifyBin(tab, i); |
1737 |
> |
if (!added) |
1738 |
> |
return val; |
1739 |
> |
break; |
1740 |
> |
} |
1741 |
> |
} |
1742 |
> |
} |
1743 |
> |
if (val != null) |
1744 |
> |
addCount(1L, binCount); |
1745 |
> |
return val; |
1746 |
|
} |
1747 |
|
|
1748 |
|
/** |
1749 |
< |
* Returns <tt>true</tt> if this map maps one or more keys to the |
1750 |
< |
* specified value. Note: This method requires a full internal |
1751 |
< |
* traversal of the hash table, and so is much slower than |
1752 |
< |
* method <tt>containsKey</tt>. |
1749 |
> |
* If the value for the specified key is present, attempts to |
1750 |
> |
* compute a new mapping given the key and its current mapped |
1751 |
> |
* value. The entire method invocation is performed atomically. |
1752 |
> |
* Some attempted update operations on this map by other threads |
1753 |
> |
* may be blocked while computation is in progress, so the |
1754 |
> |
* computation should be short and simple, and must not attempt to |
1755 |
> |
* update any other mappings of this map. |
1756 |
|
* |
1757 |
< |
* @param value value whose presence in this map is to be tested |
1758 |
< |
* @return <tt>true</tt> if this map maps one or more keys to the |
1759 |
< |
* specified value |
1760 |
< |
* @throws NullPointerException if the specified value is null |
1757 |
> |
* @param key key with which a value may be associated |
1758 |
> |
* @param remappingFunction the function to compute a value |
1759 |
> |
* @return the new value associated with the specified key, or null if none |
1760 |
> |
* @throws NullPointerException if the specified key or remappingFunction |
1761 |
> |
* is null |
1762 |
> |
* @throws IllegalStateException if the computation detectably |
1763 |
> |
* attempts a recursive update to this map that would |
1764 |
> |
* otherwise never complete |
1765 |
> |
* @throws RuntimeException or Error if the remappingFunction does so, |
1766 |
> |
* in which case the mapping is unchanged |
1767 |
|
*/ |
1768 |
< |
public boolean containsValue(Object value) { |
1769 |
< |
if (value == null) |
1768 |
> |
public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { |
1769 |
> |
if (key == null || remappingFunction == null) |
1770 |
|
throw new NullPointerException(); |
1771 |
+ |
int h = spread(key.hashCode()); |
1772 |
+ |
V val = null; |
1773 |
+ |
int delta = 0; |
1774 |
+ |
int binCount = 0; |
1775 |
+ |
for (Node<K,V>[] tab = table;;) { |
1776 |
+ |
Node<K,V> f; int n, i, fh; |
1777 |
+ |
if (tab == null || (n = tab.length) == 0) |
1778 |
+ |
tab = initTable(); |
1779 |
+ |
else if ((f = tabAt(tab, i = (n - 1) & h)) == null) |
1780 |
+ |
break; |
1781 |
+ |
else if ((fh = f.hash) == MOVED) |
1782 |
+ |
tab = helpTransfer(tab, f); |
1783 |
+ |
else { |
1784 |
+ |
synchronized (f) { |
1785 |
+ |
if (tabAt(tab, i) == f) { |
1786 |
+ |
if (fh >= 0) { |
1787 |
+ |
binCount = 1; |
1788 |
+ |
for (Node<K,V> e = f, pred = null;; ++binCount) { |
1789 |
+ |
K ek; |
1790 |
+ |
if (e.hash == h && |
1791 |
+ |
((ek = e.key) == key || |
1792 |
+ |
(ek != null && key.equals(ek)))) { |
1793 |
+ |
val = remappingFunction.apply(key, e.val); |
1794 |
+ |
if (val != null) |
1795 |
+ |
e.val = val; |
1796 |
+ |
else { |
1797 |
+ |
delta = -1; |
1798 |
+ |
Node<K,V> en = e.next; |
1799 |
+ |
if (pred != null) |
1800 |
+ |
pred.next = en; |
1801 |
+ |
else |
1802 |
+ |
setTabAt(tab, i, en); |
1803 |
+ |
} |
1804 |
+ |
break; |
1805 |
+ |
} |
1806 |
+ |
pred = e; |
1807 |
+ |
if ((e = e.next) == null) |
1808 |
+ |
break; |
1809 |
+ |
} |
1810 |
+ |
} |
1811 |
+ |
else if (f instanceof TreeBin) { |
1812 |
+ |
binCount = 2; |
1813 |
+ |
TreeBin<K,V> t = (TreeBin<K,V>)f; |
1814 |
+ |
TreeNode<K,V> r, p; |
1815 |
+ |
if ((r = t.root) != null && |
1816 |
+ |
(p = r.findTreeNode(h, key, null)) != null) { |
1817 |
+ |
val = remappingFunction.apply(key, p.val); |
1818 |
+ |
if (val != null) |
1819 |
+ |
p.val = val; |
1820 |
+ |
else { |
1821 |
+ |
delta = -1; |
1822 |
+ |
if (t.removeTreeNode(p)) |
1823 |
+ |
setTabAt(tab, i, untreeify(t.first)); |
1824 |
+ |
} |
1825 |
+ |
} |
1826 |
+ |
} |
1827 |
+ |
else if (f instanceof ReservationNode) |
1828 |
+ |
throw new IllegalStateException("Recursive update"); |
1829 |
+ |
} |
1830 |
+ |
} |
1831 |
+ |
if (binCount != 0) |
1832 |
+ |
break; |
1833 |
+ |
} |
1834 |
+ |
} |
1835 |
+ |
if (delta != 0) |
1836 |
+ |
addCount((long)delta, binCount); |
1837 |
+ |
return val; |
1838 |
+ |
} |
1839 |
|
|
1840 |
< |
// See explanation of modCount use above |
1841 |
< |
|
1842 |
< |
final Segment<K,V>[] segments = this.segments; |
1843 |
< |
int[] mc = new int[segments.length]; |
1844 |
< |
|
1845 |
< |
// Try a few times without locking |
1846 |
< |
for (int k = 0; k < RETRIES_BEFORE_LOCK; ++k) { |
1847 |
< |
int sum = 0; |
1848 |
< |
int mcsum = 0; |
1849 |
< |
for (int i = 0; i < segments.length; ++i) { |
1850 |
< |
int c = segments[i].count; |
1851 |
< |
mcsum += mc[i] = segments[i].modCount; |
1852 |
< |
if (segments[i].containsValue(value)) |
1853 |
< |
return true; |
1840 |
> |
/** |
1841 |
> |
* Attempts to compute a mapping for the specified key and its |
1842 |
> |
* current mapped value (or {@code null} if there is no current |
1843 |
> |
* mapping). The entire method invocation is performed atomically. |
1844 |
> |
* Some attempted update operations on this map by other threads |
1845 |
> |
* may be blocked while computation is in progress, so the |
1846 |
> |
* computation should be short and simple, and must not attempt to |
1847 |
> |
* update any other mappings of this Map. |
1848 |
> |
* |
1849 |
> |
* @param key key with which the specified value is to be associated |
1850 |
> |
* @param remappingFunction the function to compute a value |
1851 |
> |
* @return the new value associated with the specified key, or null if none |
1852 |
> |
* @throws NullPointerException if the specified key or remappingFunction |
1853 |
> |
* is null |
1854 |
> |
* @throws IllegalStateException if the computation detectably |
1855 |
> |
* attempts a recursive update to this map that would |
1856 |
> |
* otherwise never complete |
1857 |
> |
* @throws RuntimeException or Error if the remappingFunction does so, |
1858 |
> |
* in which case the mapping is unchanged |
1859 |
> |
*/ |
1860 |
> |
public V compute(K key, |
1861 |
> |
BiFunction<? super K, ? super V, ? extends V> remappingFunction) { |
1862 |
> |
if (key == null || remappingFunction == null) |
1863 |
> |
throw new NullPointerException(); |
1864 |
> |
int h = spread(key.hashCode()); |
1865 |
> |
V val = null; |
1866 |
> |
int delta = 0; |
1867 |
> |
int binCount = 0; |
1868 |
> |
for (Node<K,V>[] tab = table;;) { |
1869 |
> |
Node<K,V> f; int n, i, fh; |
1870 |
> |
if (tab == null || (n = tab.length) == 0) |
1871 |
> |
tab = initTable(); |
1872 |
> |
else if ((f = tabAt(tab, i = (n - 1) & h)) == null) { |
1873 |
> |
Node<K,V> r = new ReservationNode<K,V>(); |
1874 |
> |
synchronized (r) { |
1875 |
> |
if (casTabAt(tab, i, null, r)) { |
1876 |
> |
binCount = 1; |
1877 |
> |
Node<K,V> node = null; |
1878 |
> |
try { |
1879 |
> |
if ((val = remappingFunction.apply(key, null)) != null) { |
1880 |
> |
delta = 1; |
1881 |
> |
node = new Node<K,V>(h, key, val); |
1882 |
> |
} |
1883 |
> |
} finally { |
1884 |
> |
setTabAt(tab, i, node); |
1885 |
> |
} |
1886 |
> |
} |
1887 |
> |
} |
1888 |
> |
if (binCount != 0) |
1889 |
> |
break; |
1890 |
|
} |
1891 |
< |
boolean cleanSweep = true; |
1892 |
< |
if (mcsum != 0) { |
1893 |
< |
for (int i = 0; i < segments.length; ++i) { |
1894 |
< |
int c = segments[i].count; |
1895 |
< |
if (mc[i] != segments[i].modCount) { |
1896 |
< |
cleanSweep = false; |
1897 |
< |
break; |
1891 |
> |
else if ((fh = f.hash) == MOVED) |
1892 |
> |
tab = helpTransfer(tab, f); |
1893 |
> |
else { |
1894 |
> |
synchronized (f) { |
1895 |
> |
if (tabAt(tab, i) == f) { |
1896 |
> |
if (fh >= 0) { |
1897 |
> |
binCount = 1; |
1898 |
> |
for (Node<K,V> e = f, pred = null;; ++binCount) { |
1899 |
> |
K ek; |
1900 |
> |
if (e.hash == h && |
1901 |
> |
((ek = e.key) == key || |
1902 |
> |
(ek != null && key.equals(ek)))) { |
1903 |
> |
val = remappingFunction.apply(key, e.val); |
1904 |
> |
if (val != null) |
1905 |
> |
e.val = val; |
1906 |
> |
else { |
1907 |
> |
delta = -1; |
1908 |
> |
Node<K,V> en = e.next; |
1909 |
> |
if (pred != null) |
1910 |
> |
pred.next = en; |
1911 |
> |
else |
1912 |
> |
setTabAt(tab, i, en); |
1913 |
> |
} |
1914 |
> |
break; |
1915 |
> |
} |
1916 |
> |
pred = e; |
1917 |
> |
if ((e = e.next) == null) { |
1918 |
> |
val = remappingFunction.apply(key, null); |
1919 |
> |
if (val != null) { |
1920 |
> |
if (pred.next != null) |
1921 |
> |
throw new IllegalStateException("Recursive update"); |
1922 |
> |
delta = 1; |
1923 |
> |
pred.next = new Node<K,V>(h, key, val); |
1924 |
> |
} |
1925 |
> |
break; |
1926 |
> |
} |
1927 |
> |
} |
1928 |
> |
} |
1929 |
> |
else if (f instanceof TreeBin) { |
1930 |
> |
binCount = 1; |
1931 |
> |
TreeBin<K,V> t = (TreeBin<K,V>)f; |
1932 |
> |
TreeNode<K,V> r, p; |
1933 |
> |
if ((r = t.root) != null) |
1934 |
> |
p = r.findTreeNode(h, key, null); |
1935 |
> |
else |
1936 |
> |
p = null; |
1937 |
> |
V pv = (p == null) ? null : p.val; |
1938 |
> |
val = remappingFunction.apply(key, pv); |
1939 |
> |
if (val != null) { |
1940 |
> |
if (p != null) |
1941 |
> |
p.val = val; |
1942 |
> |
else { |
1943 |
> |
delta = 1; |
1944 |
> |
t.putTreeVal(h, key, val); |
1945 |
> |
} |
1946 |
> |
} |
1947 |
> |
else if (p != null) { |
1948 |
> |
delta = -1; |
1949 |
> |
if (t.removeTreeNode(p)) |
1950 |
> |
setTabAt(tab, i, untreeify(t.first)); |
1951 |
> |
} |
1952 |
> |
} |
1953 |
> |
else if (f instanceof ReservationNode) |
1954 |
> |
throw new IllegalStateException("Recursive update"); |
1955 |
|
} |
1956 |
|
} |
1957 |
+ |
if (binCount != 0) { |
1958 |
+ |
if (binCount >= TREEIFY_THRESHOLD) |
1959 |
+ |
treeifyBin(tab, i); |
1960 |
+ |
break; |
1961 |
+ |
} |
1962 |
|
} |
820 |
– |
if (cleanSweep) |
821 |
– |
return false; |
1963 |
|
} |
1964 |
< |
// Resort to locking all segments |
1965 |
< |
for (int i = 0; i < segments.length; ++i) |
1966 |
< |
segments[i].lock(); |
1967 |
< |
boolean found = false; |
1968 |
< |
try { |
1969 |
< |
for (int i = 0; i < segments.length; ++i) { |
1970 |
< |
if (segments[i].containsValue(value)) { |
1971 |
< |
found = true; |
1964 |
> |
if (delta != 0) |
1965 |
> |
addCount((long)delta, binCount); |
1966 |
> |
return val; |
1967 |
> |
} |
1968 |
> |
|
1969 |
> |
/** |
1970 |
> |
* If the specified key is not already associated with a |
1971 |
> |
* (non-null) value, associates it with the given value. |
1972 |
> |
* Otherwise, replaces the value with the results of the given |
1973 |
> |
* remapping function, or removes if {@code null}. The entire |
1974 |
> |
* method invocation is performed atomically. Some attempted |
1975 |
> |
* update operations on this map by other threads may be blocked |
1976 |
> |
* while computation is in progress, so the computation should be |
1977 |
> |
* short and simple, and must not attempt to update any other |
1978 |
> |
* mappings of this Map. |
1979 |
> |
* |
1980 |
> |
* @param key key with which the specified value is to be associated |
1981 |
> |
* @param value the value to use if absent |
1982 |
> |
* @param remappingFunction the function to recompute a value if present |
1983 |
> |
* @return the new value associated with the specified key, or null if none |
1984 |
> |
* @throws NullPointerException if the specified key or the |
1985 |
> |
* remappingFunction is null |
1986 |
> |
* @throws RuntimeException or Error if the remappingFunction does so, |
1987 |
> |
* in which case the mapping is unchanged |
1988 |
> |
*/ |
1989 |
> |
public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) { |
1990 |
> |
if (key == null || value == null || remappingFunction == null) |
1991 |
> |
throw new NullPointerException(); |
1992 |
> |
int h = spread(key.hashCode()); |
1993 |
> |
V val = null; |
1994 |
> |
int delta = 0; |
1995 |
> |
int binCount = 0; |
1996 |
> |
for (Node<K,V>[] tab = table;;) { |
1997 |
> |
Node<K,V> f; int n, i, fh; |
1998 |
> |
if (tab == null || (n = tab.length) == 0) |
1999 |
> |
tab = initTable(); |
2000 |
> |
else if ((f = tabAt(tab, i = (n - 1) & h)) == null) { |
2001 |
> |
if (casTabAt(tab, i, null, new Node<K,V>(h, key, value))) { |
2002 |
> |
delta = 1; |
2003 |
> |
val = value; |
2004 |
> |
break; |
2005 |
> |
} |
2006 |
> |
} |
2007 |
> |
else if ((fh = f.hash) == MOVED) |
2008 |
> |
tab = helpTransfer(tab, f); |
2009 |
> |
else { |
2010 |
> |
synchronized (f) { |
2011 |
> |
if (tabAt(tab, i) == f) { |
2012 |
> |
if (fh >= 0) { |
2013 |
> |
binCount = 1; |
2014 |
> |
for (Node<K,V> e = f, pred = null;; ++binCount) { |
2015 |
> |
K ek; |
2016 |
> |
if (e.hash == h && |
2017 |
> |
((ek = e.key) == key || |
2018 |
> |
(ek != null && key.equals(ek)))) { |
2019 |
> |
val = remappingFunction.apply(e.val, value); |
2020 |
> |
if (val != null) |
2021 |
> |
e.val = val; |
2022 |
> |
else { |
2023 |
> |
delta = -1; |
2024 |
> |
Node<K,V> en = e.next; |
2025 |
> |
if (pred != null) |
2026 |
> |
pred.next = en; |
2027 |
> |
else |
2028 |
> |
setTabAt(tab, i, en); |
2029 |
> |
} |
2030 |
> |
break; |
2031 |
> |
} |
2032 |
> |
pred = e; |
2033 |
> |
if ((e = e.next) == null) { |
2034 |
> |
delta = 1; |
2035 |
> |
val = value; |
2036 |
> |
pred.next = new Node<K,V>(h, key, val); |
2037 |
> |
break; |
2038 |
> |
} |
2039 |
> |
} |
2040 |
> |
} |
2041 |
> |
else if (f instanceof TreeBin) { |
2042 |
> |
binCount = 2; |
2043 |
> |
TreeBin<K,V> t = (TreeBin<K,V>)f; |
2044 |
> |
TreeNode<K,V> r = t.root; |
2045 |
> |
TreeNode<K,V> p = (r == null) ? null : |
2046 |
> |
r.findTreeNode(h, key, null); |
2047 |
> |
val = (p == null) ? value : |
2048 |
> |
remappingFunction.apply(p.val, value); |
2049 |
> |
if (val != null) { |
2050 |
> |
if (p != null) |
2051 |
> |
p.val = val; |
2052 |
> |
else { |
2053 |
> |
delta = 1; |
2054 |
> |
t.putTreeVal(h, key, val); |
2055 |
> |
} |
2056 |
> |
} |
2057 |
> |
else if (p != null) { |
2058 |
> |
delta = -1; |
2059 |
> |
if (t.removeTreeNode(p)) |
2060 |
> |
setTabAt(tab, i, untreeify(t.first)); |
2061 |
> |
} |
2062 |
> |
} |
2063 |
> |
else if (f instanceof ReservationNode) |
2064 |
> |
throw new IllegalStateException("Recursive update"); |
2065 |
> |
} |
2066 |
> |
} |
2067 |
> |
if (binCount != 0) { |
2068 |
> |
if (binCount >= TREEIFY_THRESHOLD) |
2069 |
> |
treeifyBin(tab, i); |
2070 |
|
break; |
2071 |
|
} |
2072 |
|
} |
834 |
– |
} finally { |
835 |
– |
for (int i = 0; i < segments.length; ++i) |
836 |
– |
segments[i].unlock(); |
2073 |
|
} |
2074 |
< |
return found; |
2074 |
> |
if (delta != 0) |
2075 |
> |
addCount((long)delta, binCount); |
2076 |
> |
return val; |
2077 |
|
} |
2078 |
|
|
2079 |
+ |
// Hashtable legacy methods |
2080 |
+ |
|
2081 |
|
/** |
2082 |
< |
* Legacy method testing if some key maps into the specified value |
2083 |
< |
* in this table. This method is identical in functionality to |
2084 |
< |
* {@link #containsValue}, and exists solely to ensure |
2082 |
> |
* Tests if some key maps into the specified value in this table. |
2083 |
> |
* |
2084 |
> |
* <p>Note that this method is identical in functionality to |
2085 |
> |
* {@link #containsValue(Object)}, and exists solely to ensure |
2086 |
|
* full compatibility with class {@link java.util.Hashtable}, |
2087 |
|
* which supported this method prior to introduction of the |
2088 |
< |
* Java Collections framework. |
2089 |
< |
|
2088 |
> |
* Java Collections Framework. |
2089 |
> |
* |
2090 |
|
* @param value a value to search for |
2091 |
< |
* @return <tt>true</tt> if and only if some key maps to the |
2092 |
< |
* <tt>value</tt> argument in this table as |
2093 |
< |
* determined by the <tt>equals</tt> method; |
2094 |
< |
* <tt>false</tt> otherwise |
2091 |
> |
* @return {@code true} if and only if some key maps to the |
2092 |
> |
* {@code value} argument in this table as |
2093 |
> |
* determined by the {@code equals} method; |
2094 |
> |
* {@code false} otherwise |
2095 |
|
* @throws NullPointerException if the specified value is null |
2096 |
|
*/ |
2097 |
|
public boolean contains(Object value) { |
2099 |
|
} |
2100 |
|
|
2101 |
|
/** |
2102 |
< |
* Maps the specified key to the specified value in this table. |
862 |
< |
* Neither the key nor the value can be null. |
863 |
< |
* |
864 |
< |
* <p> The value can be retrieved by calling the <tt>get</tt> method |
865 |
< |
* with a key that is equal to the original key. |
2102 |
> |
* Returns an enumeration of the keys in this table. |
2103 |
|
* |
2104 |
< |
* @param key key with which the specified value is to be associated |
2105 |
< |
* @param value value to be associated with the specified key |
869 |
< |
* @return the previous value associated with <tt>key</tt>, or |
870 |
< |
* <tt>null</tt> if there was no mapping for <tt>key</tt> |
871 |
< |
* @throws NullPointerException if the specified key or value is null |
2104 |
> |
* @return an enumeration of the keys in this table |
2105 |
> |
* @see #keySet() |
2106 |
|
*/ |
2107 |
< |
public V put(K key, V value) { |
2108 |
< |
if (value == null) |
2109 |
< |
throw new NullPointerException(); |
2110 |
< |
int hash = hash(key); |
877 |
< |
return segmentFor(hash).put(key, hash, value, false); |
2107 |
> |
public Enumeration<K> keys() { |
2108 |
> |
Node<K,V>[] t; |
2109 |
> |
int f = (t = table) == null ? 0 : t.length; |
2110 |
> |
return new KeyIterator<K,V>(t, f, 0, f, this); |
2111 |
|
} |
2112 |
|
|
2113 |
|
/** |
2114 |
< |
* {@inheritDoc} |
2114 |
> |
* Returns an enumeration of the values in this table. |
2115 |
|
* |
2116 |
< |
* @return the previous value associated with the specified key, |
2117 |
< |
* or <tt>null</tt> if there was no mapping for the key |
885 |
< |
* @throws NullPointerException if the specified key or value is null |
2116 |
> |
* @return an enumeration of the values in this table |
2117 |
> |
* @see #values() |
2118 |
|
*/ |
2119 |
< |
public V putIfAbsent(K key, V value) { |
2120 |
< |
if (value == null) |
2121 |
< |
throw new NullPointerException(); |
2122 |
< |
int hash = hash(key); |
891 |
< |
return segmentFor(hash).put(key, hash, value, true); |
2119 |
> |
public Enumeration<V> elements() { |
2120 |
> |
Node<K,V>[] t; |
2121 |
> |
int f = (t = table) == null ? 0 : t.length; |
2122 |
> |
return new ValueIterator<K,V>(t, f, 0, f, this); |
2123 |
|
} |
2124 |
|
|
2125 |
+ |
// ConcurrentHashMap-only methods |
2126 |
+ |
|
2127 |
|
/** |
2128 |
< |
* Copies all of the mappings from the specified map to this one. |
2129 |
< |
* These mappings replace any mappings that this map had for any of the |
2130 |
< |
* keys currently in the specified map. |
2128 |
> |
* Returns the number of mappings. This method should be used |
2129 |
> |
* instead of {@link #size} because a ConcurrentHashMap may |
2130 |
> |
* contain more mappings than can be represented as an int. The |
2131 |
> |
* value returned is an estimate; the actual count may differ if |
2132 |
> |
* there are concurrent insertions or removals. |
2133 |
|
* |
2134 |
< |
* @param m mappings to be stored in this map |
2134 |
> |
* @return the number of mappings |
2135 |
> |
* @since 1.8 |
2136 |
|
*/ |
2137 |
< |
public void putAll(Map<? extends K, ? extends V> m) { |
2138 |
< |
for (Iterator<? extends Map.Entry<? extends K, ? extends V>> it = (Iterator<? extends Map.Entry<? extends K, ? extends V>>) m.entrySet().iterator(); it.hasNext(); ) { |
2139 |
< |
Entry<? extends K, ? extends V> e = it.next(); |
904 |
< |
put(e.getKey(), e.getValue()); |
905 |
< |
} |
2137 |
> |
public long mappingCount() { |
2138 |
> |
long n = sumCount(); |
2139 |
> |
return (n < 0L) ? 0L : n; // ignore transient negative values |
2140 |
|
} |
2141 |
|
|
2142 |
|
/** |
2143 |
< |
* Removes the key (and its corresponding value) from this map. |
2144 |
< |
* This method does nothing if the key is not in the map. |
2143 |
> |
* Creates a new {@link Set} backed by a ConcurrentHashMap |
2144 |
> |
* from the given type to {@code Boolean.TRUE}. |
2145 |
|
* |
2146 |
< |
* @param key the key that needs to be removed |
2147 |
< |
* @return the previous value associated with <tt>key</tt>, or |
2148 |
< |
* <tt>null</tt> if there was no mapping for <tt>key</tt>. |
2149 |
< |
* @throws NullPointerException if the specified key is null |
2150 |
< |
*/ |
2151 |
< |
public V remove(Object key) { |
2152 |
< |
int hash = hash(key); |
919 |
< |
return segmentFor(hash).remove(key, hash, null); |
2146 |
> |
* @param <K> the element type of the returned set |
2147 |
> |
* @return the new set |
2148 |
> |
* @since 1.8 |
2149 |
> |
*/ |
2150 |
> |
public static <K> KeySetView<K,Boolean> newKeySet() { |
2151 |
> |
return new KeySetView<K,Boolean> |
2152 |
> |
(new ConcurrentHashMap<K,Boolean>(), Boolean.TRUE); |
2153 |
|
} |
2154 |
|
|
2155 |
|
/** |
2156 |
< |
* {@inheritDoc} |
2156 |
> |
* Creates a new {@link Set} backed by a ConcurrentHashMap |
2157 |
> |
* from the given type to {@code Boolean.TRUE}. |
2158 |
|
* |
2159 |
< |
* @throws NullPointerException if the specified key is null |
2159 |
> |
* @param initialCapacity The implementation performs internal |
2160 |
> |
* sizing to accommodate this many elements. |
2161 |
> |
* @param <K> the element type of the returned set |
2162 |
> |
* @return the new set |
2163 |
> |
* @throws IllegalArgumentException if the initial capacity of |
2164 |
> |
* elements is negative |
2165 |
> |
* @since 1.8 |
2166 |
|
*/ |
2167 |
< |
public boolean remove(Object key, Object value) { |
2168 |
< |
if (value == null) |
2169 |
< |
return false; |
930 |
< |
int hash = hash(key); |
931 |
< |
return segmentFor(hash).remove(key, hash, value) != null; |
2167 |
> |
public static <K> KeySetView<K,Boolean> newKeySet(int initialCapacity) { |
2168 |
> |
return new KeySetView<K,Boolean> |
2169 |
> |
(new ConcurrentHashMap<K,Boolean>(initialCapacity), Boolean.TRUE); |
2170 |
|
} |
2171 |
|
|
2172 |
|
/** |
2173 |
< |
* {@inheritDoc} |
2173 |
> |
* Returns a {@link Set} view of the keys in this map, using the |
2174 |
> |
* given common mapped value for any additions (i.e., {@link |
2175 |
> |
* Collection#add} and {@link Collection#addAll(Collection)}). |
2176 |
> |
* This is of course only appropriate if it is acceptable to use |
2177 |
> |
* the same value for all additions from this view. |
2178 |
|
* |
2179 |
< |
* @throws NullPointerException if any of the arguments are null |
2179 |
> |
* @param mappedValue the mapped value to use for any additions |
2180 |
> |
* @return the set view |
2181 |
> |
* @throws NullPointerException if the mappedValue is null |
2182 |
|
*/ |
2183 |
< |
public boolean replace(K key, V oldValue, V newValue) { |
2184 |
< |
if (oldValue == null || newValue == null) |
2183 |
> |
public KeySetView<K,V> keySet(V mappedValue) { |
2184 |
> |
if (mappedValue == null) |
2185 |
|
throw new NullPointerException(); |
2186 |
< |
int hash = hash(key); |
943 |
< |
return segmentFor(hash).replace(key, hash, oldValue, newValue); |
2186 |
> |
return new KeySetView<K,V>(this, mappedValue); |
2187 |
|
} |
2188 |
|
|
2189 |
+ |
/* ---------------- Special Nodes -------------- */ |
2190 |
+ |
|
2191 |
|
/** |
2192 |
< |
* {@inheritDoc} |
948 |
< |
* |
949 |
< |
* @return the previous value associated with the specified key, |
950 |
< |
* or <tt>null</tt> if there was no mapping for the key |
951 |
< |
* @throws NullPointerException if the specified key or value is null |
2192 |
> |
* A node inserted at head of bins during transfer operations. |
2193 |
|
*/ |
2194 |
< |
public V replace(K key, V value) { |
2195 |
< |
if (value == null) |
2196 |
< |
throw new NullPointerException(); |
2197 |
< |
int hash = hash(key); |
2198 |
< |
return segmentFor(hash).replace(key, hash, value); |
2194 |
> |
static final class ForwardingNode<K,V> extends Node<K,V> { |
2195 |
> |
final Node<K,V>[] nextTable; |
2196 |
> |
ForwardingNode(Node<K,V>[] tab) { |
2197 |
> |
super(MOVED, null, null); |
2198 |
> |
this.nextTable = tab; |
2199 |
> |
} |
2200 |
> |
|
2201 |
> |
Node<K,V> find(int h, Object k) { |
2202 |
> |
// loop to avoid arbitrarily deep recursion on forwarding nodes |
2203 |
> |
outer: for (Node<K,V>[] tab = nextTable;;) { |
2204 |
> |
Node<K,V> e; int n; |
2205 |
> |
if (k == null || tab == null || (n = tab.length) == 0 || |
2206 |
> |
(e = tabAt(tab, (n - 1) & h)) == null) |
2207 |
> |
return null; |
2208 |
> |
for (;;) { |
2209 |
> |
int eh; K ek; |
2210 |
> |
if ((eh = e.hash) == h && |
2211 |
> |
((ek = e.key) == k || (ek != null && k.equals(ek)))) |
2212 |
> |
return e; |
2213 |
> |
if (eh < 0) { |
2214 |
> |
if (e instanceof ForwardingNode) { |
2215 |
> |
tab = ((ForwardingNode<K,V>)e).nextTable; |
2216 |
> |
continue outer; |
2217 |
> |
} |
2218 |
> |
else |
2219 |
> |
return e.find(h, k); |
2220 |
> |
} |
2221 |
> |
if ((e = e.next) == null) |
2222 |
> |
return null; |
2223 |
> |
} |
2224 |
> |
} |
2225 |
> |
} |
2226 |
|
} |
2227 |
|
|
2228 |
|
/** |
2229 |
< |
* Removes all of the mappings from this map. |
2229 |
> |
* A place-holder node used in computeIfAbsent and compute. |
2230 |
|
*/ |
2231 |
< |
public void clear() { |
2232 |
< |
for (int i = 0; i < segments.length; ++i) |
2233 |
< |
segments[i].clear(); |
2231 |
> |
static final class ReservationNode<K,V> extends Node<K,V> { |
2232 |
> |
ReservationNode() { |
2233 |
> |
super(RESERVED, null, null); |
2234 |
> |
} |
2235 |
> |
|
2236 |
> |
Node<K,V> find(int h, Object k) { |
2237 |
> |
return null; |
2238 |
> |
} |
2239 |
|
} |
2240 |
|
|
2241 |
+ |
/* ---------------- Table Initialization and Resizing -------------- */ |
2242 |
+ |
|
2243 |
|
/** |
2244 |
< |
* Returns a {@link Set} view of the keys contained in this map. |
2245 |
< |
* The set is backed by the map, so changes to the map are |
2246 |
< |
* reflected in the set, and vice-versa. The set supports element |
2247 |
< |
* removal, which removes the corresponding mapping from this map, |
2248 |
< |
* via the <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, |
974 |
< |
* <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt> |
975 |
< |
* operations. It does not support the <tt>add</tt> or |
976 |
< |
* <tt>addAll</tt> operations. |
977 |
< |
* |
978 |
< |
* <p>The view's <tt>iterator</tt> is a "weakly consistent" iterator |
979 |
< |
* that will never throw {@link ConcurrentModificationException}, |
980 |
< |
* and guarantees to traverse elements as they existed upon |
981 |
< |
* construction of the iterator, and may (but is not guaranteed to) |
982 |
< |
* reflect any modifications subsequent to construction. |
983 |
< |
*/ |
984 |
< |
public Set<K> keySet() { |
985 |
< |
Set<K> ks = keySet; |
986 |
< |
return (ks != null) ? ks : (keySet = new KeySet()); |
2244 |
> |
* Returns the stamp bits for resizing a table of size n. |
2245 |
> |
* Must be negative when shifted left by RESIZE_STAMP_SHIFT. |
2246 |
> |
*/ |
2247 |
> |
static final int resizeStamp(int n) { |
2248 |
> |
return Integer.numberOfLeadingZeros(n) | (1 << (RESIZE_STAMP_BITS - 1)); |
2249 |
|
} |
2250 |
|
|
2251 |
|
/** |
2252 |
< |
* Returns a {@link Collection} view of the values contained in this map. |
991 |
< |
* The collection is backed by the map, so changes to the map are |
992 |
< |
* reflected in the collection, and vice-versa. The collection |
993 |
< |
* supports element removal, which removes the corresponding |
994 |
< |
* mapping from this map, via the <tt>Iterator.remove</tt>, |
995 |
< |
* <tt>Collection.remove</tt>, <tt>removeAll</tt>, |
996 |
< |
* <tt>retainAll</tt>, and <tt>clear</tt> operations. It does not |
997 |
< |
* support the <tt>add</tt> or <tt>addAll</tt> operations. |
998 |
< |
* |
999 |
< |
* <p>The view's <tt>iterator</tt> is a "weakly consistent" iterator |
1000 |
< |
* that will never throw {@link ConcurrentModificationException}, |
1001 |
< |
* and guarantees to traverse elements as they existed upon |
1002 |
< |
* construction of the iterator, and may (but is not guaranteed to) |
1003 |
< |
* reflect any modifications subsequent to construction. |
2252 |
> |
* Initializes table, using the size recorded in sizeCtl. |
2253 |
|
*/ |
2254 |
< |
public Collection<V> values() { |
2255 |
< |
Collection<V> vs = values; |
2256 |
< |
return (vs != null) ? vs : (values = new Values()); |
2254 |
> |
private final Node<K,V>[] initTable() { |
2255 |
> |
Node<K,V>[] tab; int sc; |
2256 |
> |
while ((tab = table) == null || tab.length == 0) { |
2257 |
> |
if ((sc = sizeCtl) < 0) |
2258 |
> |
Thread.yield(); // lost initialization race; just spin |
2259 |
> |
else if (U.compareAndSetInt(this, SIZECTL, sc, -1)) { |
2260 |
> |
try { |
2261 |
> |
if ((tab = table) == null || tab.length == 0) { |
2262 |
> |
int n = (sc > 0) ? sc : DEFAULT_CAPACITY; |
2263 |
> |
@SuppressWarnings("unchecked") |
2264 |
> |
Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n]; |
2265 |
> |
table = tab = nt; |
2266 |
> |
sc = n - (n >>> 2); |
2267 |
> |
} |
2268 |
> |
} finally { |
2269 |
> |
sizeCtl = sc; |
2270 |
> |
} |
2271 |
> |
break; |
2272 |
> |
} |
2273 |
> |
} |
2274 |
> |
return tab; |
2275 |
|
} |
2276 |
|
|
2277 |
|
/** |
2278 |
< |
* Returns a {@link Set} view of the mappings contained in this map. |
2279 |
< |
* The set is backed by the map, so changes to the map are |
2280 |
< |
* reflected in the set, and vice-versa. The set supports element |
2281 |
< |
* removal, which removes the corresponding mapping from the map, |
2282 |
< |
* via the <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, |
2283 |
< |
* <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt> |
2284 |
< |
* operations. It does not support the <tt>add</tt> or |
2285 |
< |
* <tt>addAll</tt> operations. |
1019 |
< |
* |
1020 |
< |
* <p>The view's <tt>iterator</tt> is a "weakly consistent" iterator |
1021 |
< |
* that will never throw {@link ConcurrentModificationException}, |
1022 |
< |
* and guarantees to traverse elements as they existed upon |
1023 |
< |
* construction of the iterator, and may (but is not guaranteed to) |
1024 |
< |
* reflect any modifications subsequent to construction. |
2278 |
> |
* Adds to count, and if table is too small and not already |
2279 |
> |
* resizing, initiates transfer. If already resizing, helps |
2280 |
> |
* perform transfer if work is available. Rechecks occupancy |
2281 |
> |
* after a transfer to see if another resize is already needed |
2282 |
> |
* because resizings are lagging additions. |
2283 |
> |
* |
2284 |
> |
* @param x the count to add |
2285 |
> |
* @param check if <0, don't check resize, if <= 1 only check if uncontended |
2286 |
|
*/ |
2287 |
< |
public Set<Map.Entry<K,V>> entrySet() { |
2288 |
< |
Set<Map.Entry<K,V>> es = entrySet; |
2289 |
< |
return (es != null) ? es : (entrySet = new EntrySet()); |
2287 |
> |
private final void addCount(long x, int check) { |
2288 |
> |
CounterCell[] cs; long b, s; |
2289 |
> |
if ((cs = counterCells) != null || |
2290 |
> |
!U.compareAndSetLong(this, BASECOUNT, b = baseCount, s = b + x)) { |
2291 |
> |
CounterCell c; long v; int m; |
2292 |
> |
boolean uncontended = true; |
2293 |
> |
if (cs == null || (m = cs.length - 1) < 0 || |
2294 |
> |
(c = cs[ThreadLocalRandom.getProbe() & m]) == null || |
2295 |
> |
!(uncontended = |
2296 |
> |
U.compareAndSetLong(c, CELLVALUE, v = c.value, v + x))) { |
2297 |
> |
fullAddCount(x, uncontended); |
2298 |
> |
return; |
2299 |
> |
} |
2300 |
> |
if (check <= 1) |
2301 |
> |
return; |
2302 |
> |
s = sumCount(); |
2303 |
> |
} |
2304 |
> |
if (check >= 0) { |
2305 |
> |
Node<K,V>[] tab, nt; int n, sc; |
2306 |
> |
while (s >= (long)(sc = sizeCtl) && (tab = table) != null && |
2307 |
> |
(n = tab.length) < MAXIMUM_CAPACITY) { |
2308 |
> |
int rs = resizeStamp(n) << RESIZE_STAMP_SHIFT; |
2309 |
> |
if (sc < 0) { |
2310 |
> |
if (sc == rs + MAX_RESIZERS || sc == rs + 1 || |
2311 |
> |
(nt = nextTable) == null || transferIndex <= 0) |
2312 |
> |
break; |
2313 |
> |
if (U.compareAndSetInt(this, SIZECTL, sc, sc + 1)) |
2314 |
> |
transfer(tab, nt); |
2315 |
> |
} |
2316 |
> |
else if (U.compareAndSetInt(this, SIZECTL, sc, rs + 2)) |
2317 |
> |
transfer(tab, null); |
2318 |
> |
s = sumCount(); |
2319 |
> |
} |
2320 |
> |
} |
2321 |
|
} |
2322 |
|
|
2323 |
|
/** |
2324 |
< |
* Returns an enumeration of the keys in this table. |
1033 |
< |
* |
1034 |
< |
* @return an enumeration of the keys in this table |
1035 |
< |
* @see #keySet |
2324 |
> |
* Helps transfer if a resize is in progress. |
2325 |
|
*/ |
2326 |
< |
public Enumeration<K> keys() { |
2327 |
< |
return new KeyIterator(); |
2326 |
> |
final Node<K,V>[] helpTransfer(Node<K,V>[] tab, Node<K,V> f) { |
2327 |
> |
Node<K,V>[] nextTab; int sc; |
2328 |
> |
if (tab != null && (f instanceof ForwardingNode) && |
2329 |
> |
(nextTab = ((ForwardingNode<K,V>)f).nextTable) != null) { |
2330 |
> |
int rs = resizeStamp(tab.length) << RESIZE_STAMP_SHIFT; |
2331 |
> |
while (nextTab == nextTable && table == tab && |
2332 |
> |
(sc = sizeCtl) < 0) { |
2333 |
> |
if (sc == rs + MAX_RESIZERS || sc == rs + 1 || |
2334 |
> |
transferIndex <= 0) |
2335 |
> |
break; |
2336 |
> |
if (U.compareAndSetInt(this, SIZECTL, sc, sc + 1)) { |
2337 |
> |
transfer(tab, nextTab); |
2338 |
> |
break; |
2339 |
> |
} |
2340 |
> |
} |
2341 |
> |
return nextTab; |
2342 |
> |
} |
2343 |
> |
return table; |
2344 |
|
} |
2345 |
|
|
2346 |
|
/** |
2347 |
< |
* Returns an enumeration of the values in this table. |
2347 |
> |
* Tries to presize table to accommodate the given number of elements. |
2348 |
|
* |
2349 |
< |
* @return an enumeration of the values in this table |
1045 |
< |
* @see #values |
2349 |
> |
* @param size number of elements (doesn't need to be perfectly accurate) |
2350 |
|
*/ |
2351 |
< |
public Enumeration<V> elements() { |
2352 |
< |
return new ValueIterator(); |
2351 |
> |
private final void tryPresize(int size) { |
2352 |
> |
int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY : |
2353 |
> |
tableSizeFor(size + (size >>> 1) + 1); |
2354 |
> |
int sc; |
2355 |
> |
while ((sc = sizeCtl) >= 0) { |
2356 |
> |
Node<K,V>[] tab = table; int n; |
2357 |
> |
if (tab == null || (n = tab.length) == 0) { |
2358 |
> |
n = (sc > c) ? sc : c; |
2359 |
> |
if (U.compareAndSetInt(this, SIZECTL, sc, -1)) { |
2360 |
> |
try { |
2361 |
> |
if (table == tab) { |
2362 |
> |
@SuppressWarnings("unchecked") |
2363 |
> |
Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n]; |
2364 |
> |
table = nt; |
2365 |
> |
sc = n - (n >>> 2); |
2366 |
> |
} |
2367 |
> |
} finally { |
2368 |
> |
sizeCtl = sc; |
2369 |
> |
} |
2370 |
> |
} |
2371 |
> |
} |
2372 |
> |
else if (c <= sc || n >= MAXIMUM_CAPACITY) |
2373 |
> |
break; |
2374 |
> |
else if (tab == table) { |
2375 |
> |
int rs = resizeStamp(n); |
2376 |
> |
if (U.compareAndSetInt(this, SIZECTL, sc, |
2377 |
> |
(rs << RESIZE_STAMP_SHIFT) + 2)) |
2378 |
> |
transfer(tab, null); |
2379 |
> |
} |
2380 |
> |
} |
2381 |
|
} |
2382 |
|
|
2383 |
< |
/* ---------------- Iterator Support -------------- */ |
2383 |
> |
/** |
2384 |
> |
* Moves and/or copies the nodes in each bin to new table. See |
2385 |
> |
* above for explanation. |
2386 |
> |
*/ |
2387 |
> |
private final void transfer(Node<K,V>[] tab, Node<K,V>[] nextTab) { |
2388 |
> |
int n = tab.length, stride; |
2389 |
> |
if ((stride = (NCPU > 1) ? (n >>> 3) / NCPU : n) < MIN_TRANSFER_STRIDE) |
2390 |
> |
stride = MIN_TRANSFER_STRIDE; // subdivide range |
2391 |
> |
if (nextTab == null) { // initiating |
2392 |
> |
try { |
2393 |
> |
@SuppressWarnings("unchecked") |
2394 |
> |
Node<K,V>[] nt = (Node<K,V>[])new Node<?,?>[n << 1]; |
2395 |
> |
nextTab = nt; |
2396 |
> |
} catch (Throwable ex) { // try to cope with OOME |
2397 |
> |
sizeCtl = Integer.MAX_VALUE; |
2398 |
> |
return; |
2399 |
> |
} |
2400 |
> |
nextTable = nextTab; |
2401 |
> |
transferIndex = n; |
2402 |
> |
} |
2403 |
> |
int nextn = nextTab.length; |
2404 |
> |
ForwardingNode<K,V> fwd = new ForwardingNode<K,V>(nextTab); |
2405 |
> |
boolean advance = true; |
2406 |
> |
boolean finishing = false; // to ensure sweep before committing nextTab |
2407 |
> |
for (int i = 0, bound = 0;;) { |
2408 |
> |
Node<K,V> f; int fh; |
2409 |
> |
while (advance) { |
2410 |
> |
int nextIndex, nextBound; |
2411 |
> |
if (--i >= bound || finishing) |
2412 |
> |
advance = false; |
2413 |
> |
else if ((nextIndex = transferIndex) <= 0) { |
2414 |
> |
i = -1; |
2415 |
> |
advance = false; |
2416 |
> |
} |
2417 |
> |
else if (U.compareAndSetInt |
2418 |
> |
(this, TRANSFERINDEX, nextIndex, |
2419 |
> |
nextBound = (nextIndex > stride ? |
2420 |
> |
nextIndex - stride : 0))) { |
2421 |
> |
bound = nextBound; |
2422 |
> |
i = nextIndex - 1; |
2423 |
> |
advance = false; |
2424 |
> |
} |
2425 |
> |
} |
2426 |
> |
if (i < 0 || i >= n || i + n >= nextn) { |
2427 |
> |
int sc; |
2428 |
> |
if (finishing) { |
2429 |
> |
nextTable = null; |
2430 |
> |
table = nextTab; |
2431 |
> |
sizeCtl = (n << 1) - (n >>> 1); |
2432 |
> |
return; |
2433 |
> |
} |
2434 |
> |
if (U.compareAndSetInt(this, SIZECTL, sc = sizeCtl, sc - 1)) { |
2435 |
> |
if ((sc - 2) != resizeStamp(n) << RESIZE_STAMP_SHIFT) |
2436 |
> |
return; |
2437 |
> |
finishing = advance = true; |
2438 |
> |
i = n; // recheck before commit |
2439 |
> |
} |
2440 |
> |
} |
2441 |
> |
else if ((f = tabAt(tab, i)) == null) |
2442 |
> |
advance = casTabAt(tab, i, null, fwd); |
2443 |
> |
else if ((fh = f.hash) == MOVED) |
2444 |
> |
advance = true; // already processed |
2445 |
> |
else { |
2446 |
> |
synchronized (f) { |
2447 |
> |
if (tabAt(tab, i) == f) { |
2448 |
> |
Node<K,V> ln, hn; |
2449 |
> |
if (fh >= 0) { |
2450 |
> |
int runBit = fh & n; |
2451 |
> |
Node<K,V> lastRun = f; |
2452 |
> |
for (Node<K,V> p = f.next; p != null; p = p.next) { |
2453 |
> |
int b = p.hash & n; |
2454 |
> |
if (b != runBit) { |
2455 |
> |
runBit = b; |
2456 |
> |
lastRun = p; |
2457 |
> |
} |
2458 |
> |
} |
2459 |
> |
if (runBit == 0) { |
2460 |
> |
ln = lastRun; |
2461 |
> |
hn = null; |
2462 |
> |
} |
2463 |
> |
else { |
2464 |
> |
hn = lastRun; |
2465 |
> |
ln = null; |
2466 |
> |
} |
2467 |
> |
for (Node<K,V> p = f; p != lastRun; p = p.next) { |
2468 |
> |
int ph = p.hash; K pk = p.key; V pv = p.val; |
2469 |
> |
if ((ph & n) == 0) |
2470 |
> |
ln = new Node<K,V>(ph, pk, pv, ln); |
2471 |
> |
else |
2472 |
> |
hn = new Node<K,V>(ph, pk, pv, hn); |
2473 |
> |
} |
2474 |
> |
setTabAt(nextTab, i, ln); |
2475 |
> |
setTabAt(nextTab, i + n, hn); |
2476 |
> |
setTabAt(tab, i, fwd); |
2477 |
> |
advance = true; |
2478 |
> |
} |
2479 |
> |
else if (f instanceof TreeBin) { |
2480 |
> |
TreeBin<K,V> t = (TreeBin<K,V>)f; |
2481 |
> |
TreeNode<K,V> lo = null, loTail = null; |
2482 |
> |
TreeNode<K,V> hi = null, hiTail = null; |
2483 |
> |
int lc = 0, hc = 0; |
2484 |
> |
for (Node<K,V> e = t.first; e != null; e = e.next) { |
2485 |
> |
int h = e.hash; |
2486 |
> |
TreeNode<K,V> p = new TreeNode<K,V> |
2487 |
> |
(h, e.key, e.val, null, null); |
2488 |
> |
if ((h & n) == 0) { |
2489 |
> |
if ((p.prev = loTail) == null) |
2490 |
> |
lo = p; |
2491 |
> |
else |
2492 |
> |
loTail.next = p; |
2493 |
> |
loTail = p; |
2494 |
> |
++lc; |
2495 |
> |
} |
2496 |
> |
else { |
2497 |
> |
if ((p.prev = hiTail) == null) |
2498 |
> |
hi = p; |
2499 |
> |
else |
2500 |
> |
hiTail.next = p; |
2501 |
> |
hiTail = p; |
2502 |
> |
++hc; |
2503 |
> |
} |
2504 |
> |
} |
2505 |
> |
ln = (lc <= UNTREEIFY_THRESHOLD) ? untreeify(lo) : |
2506 |
> |
(hc != 0) ? new TreeBin<K,V>(lo) : t; |
2507 |
> |
hn = (hc <= UNTREEIFY_THRESHOLD) ? untreeify(hi) : |
2508 |
> |
(lc != 0) ? new TreeBin<K,V>(hi) : t; |
2509 |
> |
setTabAt(nextTab, i, ln); |
2510 |
> |
setTabAt(nextTab, i + n, hn); |
2511 |
> |
setTabAt(tab, i, fwd); |
2512 |
> |
advance = true; |
2513 |
> |
} |
2514 |
> |
else if (f instanceof ReservationNode) |
2515 |
> |
throw new IllegalStateException("Recursive update"); |
2516 |
> |
} |
2517 |
> |
} |
2518 |
> |
} |
2519 |
> |
} |
2520 |
> |
} |
2521 |
|
|
2522 |
< |
abstract class HashIterator { |
1054 |
< |
int nextSegmentIndex; |
1055 |
< |
int nextTableIndex; |
1056 |
< |
HashEntry<K,V>[] currentTable; |
1057 |
< |
HashEntry<K, V> nextEntry; |
1058 |
< |
HashEntry<K, V> lastReturned; |
2522 |
> |
/* ---------------- Counter support -------------- */ |
2523 |
|
|
2524 |
< |
HashIterator() { |
2525 |
< |
nextSegmentIndex = segments.length - 1; |
2526 |
< |
nextTableIndex = -1; |
2527 |
< |
advance(); |
2524 |
> |
/** |
2525 |
> |
* A padded cell for distributing counts. Adapted from LongAdder |
2526 |
> |
* and Striped64. See their internal docs for explanation. |
2527 |
> |
*/ |
2528 |
> |
@jdk.internal.vm.annotation.Contended static final class CounterCell { |
2529 |
> |
volatile long value; |
2530 |
> |
CounterCell(long x) { value = x; } |
2531 |
> |
} |
2532 |
> |
|
2533 |
> |
final long sumCount() { |
2534 |
> |
CounterCell[] cs = counterCells; |
2535 |
> |
long sum = baseCount; |
2536 |
> |
if (cs != null) { |
2537 |
> |
for (CounterCell c : cs) |
2538 |
> |
if (c != null) |
2539 |
> |
sum += c.value; |
2540 |
|
} |
2541 |
+ |
return sum; |
2542 |
+ |
} |
2543 |
|
|
2544 |
< |
public boolean hasMoreElements() { return hasNext(); } |
2544 |
> |
// See LongAdder version for explanation |
2545 |
> |
private final void fullAddCount(long x, boolean wasUncontended) { |
2546 |
> |
int h; |
2547 |
> |
if ((h = ThreadLocalRandom.getProbe()) == 0) { |
2548 |
> |
ThreadLocalRandom.localInit(); // force initialization |
2549 |
> |
h = ThreadLocalRandom.getProbe(); |
2550 |
> |
wasUncontended = true; |
2551 |
> |
} |
2552 |
> |
boolean collide = false; // True if last slot nonempty |
2553 |
> |
for (;;) { |
2554 |
> |
CounterCell[] cs; CounterCell c; int n; long v; |
2555 |
> |
if ((cs = counterCells) != null && (n = cs.length) > 0) { |
2556 |
> |
if ((c = cs[(n - 1) & h]) == null) { |
2557 |
> |
if (cellsBusy == 0) { // Try to attach new Cell |
2558 |
> |
CounterCell r = new CounterCell(x); // Optimistic create |
2559 |
> |
if (cellsBusy == 0 && |
2560 |
> |
U.compareAndSetInt(this, CELLSBUSY, 0, 1)) { |
2561 |
> |
boolean created = false; |
2562 |
> |
try { // Recheck under lock |
2563 |
> |
CounterCell[] rs; int m, j; |
2564 |
> |
if ((rs = counterCells) != null && |
2565 |
> |
(m = rs.length) > 0 && |
2566 |
> |
rs[j = (m - 1) & h] == null) { |
2567 |
> |
rs[j] = r; |
2568 |
> |
created = true; |
2569 |
> |
} |
2570 |
> |
} finally { |
2571 |
> |
cellsBusy = 0; |
2572 |
> |
} |
2573 |
> |
if (created) |
2574 |
> |
break; |
2575 |
> |
continue; // Slot is now non-empty |
2576 |
> |
} |
2577 |
> |
} |
2578 |
> |
collide = false; |
2579 |
> |
} |
2580 |
> |
else if (!wasUncontended) // CAS already known to fail |
2581 |
> |
wasUncontended = true; // Continue after rehash |
2582 |
> |
else if (U.compareAndSetLong(c, CELLVALUE, v = c.value, v + x)) |
2583 |
> |
break; |
2584 |
> |
else if (counterCells != cs || n >= NCPU) |
2585 |
> |
collide = false; // At max size or stale |
2586 |
> |
else if (!collide) |
2587 |
> |
collide = true; |
2588 |
> |
else if (cellsBusy == 0 && |
2589 |
> |
U.compareAndSetInt(this, CELLSBUSY, 0, 1)) { |
2590 |
> |
try { |
2591 |
> |
if (counterCells == cs) // Expand table unless stale |
2592 |
> |
counterCells = Arrays.copyOf(cs, n << 1); |
2593 |
> |
} finally { |
2594 |
> |
cellsBusy = 0; |
2595 |
> |
} |
2596 |
> |
collide = false; |
2597 |
> |
continue; // Retry with expanded table |
2598 |
> |
} |
2599 |
> |
h = ThreadLocalRandom.advanceProbe(h); |
2600 |
> |
} |
2601 |
> |
else if (cellsBusy == 0 && counterCells == cs && |
2602 |
> |
U.compareAndSetInt(this, CELLSBUSY, 0, 1)) { |
2603 |
> |
boolean init = false; |
2604 |
> |
try { // Initialize table |
2605 |
> |
if (counterCells == cs) { |
2606 |
> |
CounterCell[] rs = new CounterCell[2]; |
2607 |
> |
rs[h & 1] = new CounterCell(x); |
2608 |
> |
counterCells = rs; |
2609 |
> |
init = true; |
2610 |
> |
} |
2611 |
> |
} finally { |
2612 |
> |
cellsBusy = 0; |
2613 |
> |
} |
2614 |
> |
if (init) |
2615 |
> |
break; |
2616 |
> |
} |
2617 |
> |
else if (U.compareAndSetLong(this, BASECOUNT, v = baseCount, v + x)) |
2618 |
> |
break; // Fall back on using base |
2619 |
> |
} |
2620 |
> |
} |
2621 |
|
|
2622 |
< |
final void advance() { |
1069 |
< |
if (nextEntry != null && (nextEntry = nextEntry.next) != null) |
1070 |
< |
return; |
2622 |
> |
/* ---------------- Conversion from/to TreeBins -------------- */ |
2623 |
|
|
2624 |
< |
while (nextTableIndex >= 0) { |
2625 |
< |
if ( (nextEntry = currentTable[nextTableIndex--]) != null) |
2626 |
< |
return; |
2624 |
> |
/** |
2625 |
> |
* Replaces all linked nodes in bin at given index unless table is |
2626 |
> |
* too small, in which case resizes instead. |
2627 |
> |
*/ |
2628 |
> |
private final void treeifyBin(Node<K,V>[] tab, int index) { |
2629 |
> |
Node<K,V> b; int n; |
2630 |
> |
if (tab != null) { |
2631 |
> |
if ((n = tab.length) < MIN_TREEIFY_CAPACITY) |
2632 |
> |
tryPresize(n << 1); |
2633 |
> |
else if ((b = tabAt(tab, index)) != null && b.hash >= 0) { |
2634 |
> |
synchronized (b) { |
2635 |
> |
if (tabAt(tab, index) == b) { |
2636 |
> |
TreeNode<K,V> hd = null, tl = null; |
2637 |
> |
for (Node<K,V> e = b; e != null; e = e.next) { |
2638 |
> |
TreeNode<K,V> p = |
2639 |
> |
new TreeNode<K,V>(e.hash, e.key, e.val, |
2640 |
> |
null, null); |
2641 |
> |
if ((p.prev = tl) == null) |
2642 |
> |
hd = p; |
2643 |
> |
else |
2644 |
> |
tl.next = p; |
2645 |
> |
tl = p; |
2646 |
> |
} |
2647 |
> |
setTabAt(tab, index, new TreeBin<K,V>(hd)); |
2648 |
> |
} |
2649 |
> |
} |
2650 |
|
} |
2651 |
+ |
} |
2652 |
+ |
} |
2653 |
|
|
2654 |
< |
while (nextSegmentIndex >= 0) { |
2655 |
< |
Segment<K,V> seg = segments[nextSegmentIndex--]; |
2656 |
< |
if (seg.count != 0) { |
2657 |
< |
currentTable = seg.table; |
2658 |
< |
for (int j = currentTable.length - 1; j >= 0; --j) { |
2659 |
< |
if ( (nextEntry = currentTable[j]) != null) { |
2660 |
< |
nextTableIndex = j - 1; |
2661 |
< |
return; |
2654 |
> |
/** |
2655 |
> |
* Returns a list of non-TreeNodes replacing those in given list. |
2656 |
> |
*/ |
2657 |
> |
static <K,V> Node<K,V> untreeify(Node<K,V> b) { |
2658 |
> |
Node<K,V> hd = null, tl = null; |
2659 |
> |
for (Node<K,V> q = b; q != null; q = q.next) { |
2660 |
> |
Node<K,V> p = new Node<K,V>(q.hash, q.key, q.val); |
2661 |
> |
if (tl == null) |
2662 |
> |
hd = p; |
2663 |
> |
else |
2664 |
> |
tl.next = p; |
2665 |
> |
tl = p; |
2666 |
> |
} |
2667 |
> |
return hd; |
2668 |
> |
} |
2669 |
> |
|
2670 |
> |
/* ---------------- TreeNodes -------------- */ |
2671 |
> |
|
2672 |
> |
/** |
2673 |
> |
* Nodes for use in TreeBins. |
2674 |
> |
*/ |
2675 |
> |
static final class TreeNode<K,V> extends Node<K,V> { |
2676 |
> |
TreeNode<K,V> parent; // red-black tree links |
2677 |
> |
TreeNode<K,V> left; |
2678 |
> |
TreeNode<K,V> right; |
2679 |
> |
TreeNode<K,V> prev; // needed to unlink next upon deletion |
2680 |
> |
boolean red; |
2681 |
> |
|
2682 |
> |
TreeNode(int hash, K key, V val, Node<K,V> next, |
2683 |
> |
TreeNode<K,V> parent) { |
2684 |
> |
super(hash, key, val, next); |
2685 |
> |
this.parent = parent; |
2686 |
> |
} |
2687 |
> |
|
2688 |
> |
Node<K,V> find(int h, Object k) { |
2689 |
> |
return findTreeNode(h, k, null); |
2690 |
> |
} |
2691 |
> |
|
2692 |
> |
/** |
2693 |
> |
* Returns the TreeNode (or null if not found) for the given key |
2694 |
> |
* starting at given root. |
2695 |
> |
*/ |
2696 |
> |
final TreeNode<K,V> findTreeNode(int h, Object k, Class<?> kc) { |
2697 |
> |
if (k != null) { |
2698 |
> |
TreeNode<K,V> p = this; |
2699 |
> |
do { |
2700 |
> |
int ph, dir; K pk; TreeNode<K,V> q; |
2701 |
> |
TreeNode<K,V> pl = p.left, pr = p.right; |
2702 |
> |
if ((ph = p.hash) > h) |
2703 |
> |
p = pl; |
2704 |
> |
else if (ph < h) |
2705 |
> |
p = pr; |
2706 |
> |
else if ((pk = p.key) == k || (pk != null && k.equals(pk))) |
2707 |
> |
return p; |
2708 |
> |
else if (pl == null) |
2709 |
> |
p = pr; |
2710 |
> |
else if (pr == null) |
2711 |
> |
p = pl; |
2712 |
> |
else if ((kc != null || |
2713 |
> |
(kc = comparableClassFor(k)) != null) && |
2714 |
> |
(dir = compareComparables(kc, k, pk)) != 0) |
2715 |
> |
p = (dir < 0) ? pl : pr; |
2716 |
> |
else if ((q = pr.findTreeNode(h, k, kc)) != null) |
2717 |
> |
return q; |
2718 |
> |
else |
2719 |
> |
p = pl; |
2720 |
> |
} while (p != null); |
2721 |
> |
} |
2722 |
> |
return null; |
2723 |
> |
} |
2724 |
> |
} |
2725 |
> |
|
2726 |
> |
/* ---------------- TreeBins -------------- */ |
2727 |
> |
|
2728 |
> |
/** |
2729 |
> |
* TreeNodes used at the heads of bins. TreeBins do not hold user |
2730 |
> |
* keys or values, but instead point to list of TreeNodes and |
2731 |
> |
* their root. They also maintain a parasitic read-write lock |
2732 |
> |
* forcing writers (who hold bin lock) to wait for readers (who do |
2733 |
> |
* not) to complete before tree restructuring operations. |
2734 |
> |
*/ |
2735 |
> |
static final class TreeBin<K,V> extends Node<K,V> { |
2736 |
> |
TreeNode<K,V> root; |
2737 |
> |
volatile TreeNode<K,V> first; |
2738 |
> |
volatile Thread waiter; |
2739 |
> |
volatile int lockState; |
2740 |
> |
// values for lockState |
2741 |
> |
static final int WRITER = 1; // set while holding write lock |
2742 |
> |
static final int WAITER = 2; // set when waiting for write lock |
2743 |
> |
static final int READER = 4; // increment value for setting read lock |
2744 |
> |
|
2745 |
> |
/** |
2746 |
> |
* Tie-breaking utility for ordering insertions when equal |
2747 |
> |
* hashCodes and non-comparable. We don't require a total |
2748 |
> |
* order, just a consistent insertion rule to maintain |
2749 |
> |
* equivalence across rebalancings. Tie-breaking further than |
2750 |
> |
* necessary simplifies testing a bit. |
2751 |
> |
*/ |
2752 |
> |
static int tieBreakOrder(Object a, Object b) { |
2753 |
> |
int d; |
2754 |
> |
if (a == null || b == null || |
2755 |
> |
(d = a.getClass().getName(). |
2756 |
> |
compareTo(b.getClass().getName())) == 0) |
2757 |
> |
d = (System.identityHashCode(a) <= System.identityHashCode(b) ? |
2758 |
> |
-1 : 1); |
2759 |
> |
return d; |
2760 |
> |
} |
2761 |
> |
|
2762 |
> |
/** |
2763 |
> |
* Creates bin with initial set of nodes headed by b. |
2764 |
> |
*/ |
2765 |
> |
TreeBin(TreeNode<K,V> b) { |
2766 |
> |
super(TREEBIN, null, null); |
2767 |
> |
this.first = b; |
2768 |
> |
TreeNode<K,V> r = null; |
2769 |
> |
for (TreeNode<K,V> x = b, next; x != null; x = next) { |
2770 |
> |
next = (TreeNode<K,V>)x.next; |
2771 |
> |
x.left = x.right = null; |
2772 |
> |
if (r == null) { |
2773 |
> |
x.parent = null; |
2774 |
> |
x.red = false; |
2775 |
> |
r = x; |
2776 |
> |
} |
2777 |
> |
else { |
2778 |
> |
K k = x.key; |
2779 |
> |
int h = x.hash; |
2780 |
> |
Class<?> kc = null; |
2781 |
> |
for (TreeNode<K,V> p = r;;) { |
2782 |
> |
int dir, ph; |
2783 |
> |
K pk = p.key; |
2784 |
> |
if ((ph = p.hash) > h) |
2785 |
> |
dir = -1; |
2786 |
> |
else if (ph < h) |
2787 |
> |
dir = 1; |
2788 |
> |
else if ((kc == null && |
2789 |
> |
(kc = comparableClassFor(k)) == null) || |
2790 |
> |
(dir = compareComparables(kc, k, pk)) == 0) |
2791 |
> |
dir = tieBreakOrder(k, pk); |
2792 |
> |
TreeNode<K,V> xp = p; |
2793 |
> |
if ((p = (dir <= 0) ? p.left : p.right) == null) { |
2794 |
> |
x.parent = xp; |
2795 |
> |
if (dir <= 0) |
2796 |
> |
xp.left = x; |
2797 |
> |
else |
2798 |
> |
xp.right = x; |
2799 |
> |
r = balanceInsertion(r, x); |
2800 |
> |
break; |
2801 |
|
} |
2802 |
|
} |
2803 |
|
} |
2804 |
|
} |
2805 |
+ |
this.root = r; |
2806 |
+ |
assert checkInvariants(root); |
2807 |
|
} |
2808 |
|
|
2809 |
< |
public boolean hasNext() { return nextEntry != null; } |
2809 |
> |
/** |
2810 |
> |
* Acquires write lock for tree restructuring. |
2811 |
> |
*/ |
2812 |
> |
private final void lockRoot() { |
2813 |
> |
if (!U.compareAndSetInt(this, LOCKSTATE, 0, WRITER)) |
2814 |
> |
contendedLock(); // offload to separate method |
2815 |
> |
} |
2816 |
|
|
2817 |
< |
HashEntry<K,V> nextEntry() { |
2818 |
< |
if (nextEntry == null) |
2819 |
< |
throw new NoSuchElementException(); |
2820 |
< |
lastReturned = nextEntry; |
2817 |
> |
/** |
2818 |
> |
* Releases write lock for tree restructuring. |
2819 |
> |
*/ |
2820 |
> |
private final void unlockRoot() { |
2821 |
> |
lockState = 0; |
2822 |
> |
} |
2823 |
> |
|
2824 |
> |
/** |
2825 |
> |
* Possibly blocks awaiting root lock. |
2826 |
> |
*/ |
2827 |
> |
private final void contendedLock() { |
2828 |
> |
boolean waiting = false; |
2829 |
> |
for (int s;;) { |
2830 |
> |
if (((s = lockState) & ~WAITER) == 0) { |
2831 |
> |
if (U.compareAndSetInt(this, LOCKSTATE, s, WRITER)) { |
2832 |
> |
if (waiting) |
2833 |
> |
waiter = null; |
2834 |
> |
return; |
2835 |
> |
} |
2836 |
> |
} |
2837 |
> |
else if ((s & WAITER) == 0) { |
2838 |
> |
if (U.compareAndSetInt(this, LOCKSTATE, s, s | WAITER)) { |
2839 |
> |
waiting = true; |
2840 |
> |
waiter = Thread.currentThread(); |
2841 |
> |
} |
2842 |
> |
} |
2843 |
> |
else if (waiting) |
2844 |
> |
LockSupport.park(this); |
2845 |
> |
} |
2846 |
> |
} |
2847 |
> |
|
2848 |
> |
/** |
2849 |
> |
* Returns matching node or null if none. Tries to search |
2850 |
> |
* using tree comparisons from root, but continues linear |
2851 |
> |
* search when lock not available. |
2852 |
> |
*/ |
2853 |
> |
final Node<K,V> find(int h, Object k) { |
2854 |
> |
if (k != null) { |
2855 |
> |
for (Node<K,V> e = first; e != null; ) { |
2856 |
> |
int s; K ek; |
2857 |
> |
if (((s = lockState) & (WAITER|WRITER)) != 0) { |
2858 |
> |
if (e.hash == h && |
2859 |
> |
((ek = e.key) == k || (ek != null && k.equals(ek)))) |
2860 |
> |
return e; |
2861 |
> |
e = e.next; |
2862 |
> |
} |
2863 |
> |
else if (U.compareAndSetInt(this, LOCKSTATE, s, |
2864 |
> |
s + READER)) { |
2865 |
> |
TreeNode<K,V> r, p; |
2866 |
> |
try { |
2867 |
> |
p = ((r = root) == null ? null : |
2868 |
> |
r.findTreeNode(h, k, null)); |
2869 |
> |
} finally { |
2870 |
> |
Thread w; |
2871 |
> |
if (U.getAndAddInt(this, LOCKSTATE, -READER) == |
2872 |
> |
(READER|WAITER) && (w = waiter) != null) |
2873 |
> |
LockSupport.unpark(w); |
2874 |
> |
} |
2875 |
> |
return p; |
2876 |
> |
} |
2877 |
> |
} |
2878 |
> |
} |
2879 |
> |
return null; |
2880 |
> |
} |
2881 |
> |
|
2882 |
> |
/** |
2883 |
> |
* Finds or adds a node. |
2884 |
> |
* @return null if added |
2885 |
> |
*/ |
2886 |
> |
final TreeNode<K,V> putTreeVal(int h, K k, V v) { |
2887 |
> |
Class<?> kc = null; |
2888 |
> |
boolean searched = false; |
2889 |
> |
for (TreeNode<K,V> p = root;;) { |
2890 |
> |
int dir, ph; K pk; |
2891 |
> |
if (p == null) { |
2892 |
> |
first = root = new TreeNode<K,V>(h, k, v, null, null); |
2893 |
> |
break; |
2894 |
> |
} |
2895 |
> |
else if ((ph = p.hash) > h) |
2896 |
> |
dir = -1; |
2897 |
> |
else if (ph < h) |
2898 |
> |
dir = 1; |
2899 |
> |
else if ((pk = p.key) == k || (pk != null && k.equals(pk))) |
2900 |
> |
return p; |
2901 |
> |
else if ((kc == null && |
2902 |
> |
(kc = comparableClassFor(k)) == null) || |
2903 |
> |
(dir = compareComparables(kc, k, pk)) == 0) { |
2904 |
> |
if (!searched) { |
2905 |
> |
TreeNode<K,V> q, ch; |
2906 |
> |
searched = true; |
2907 |
> |
if (((ch = p.left) != null && |
2908 |
> |
(q = ch.findTreeNode(h, k, kc)) != null) || |
2909 |
> |
((ch = p.right) != null && |
2910 |
> |
(q = ch.findTreeNode(h, k, kc)) != null)) |
2911 |
> |
return q; |
2912 |
> |
} |
2913 |
> |
dir = tieBreakOrder(k, pk); |
2914 |
> |
} |
2915 |
> |
|
2916 |
> |
TreeNode<K,V> xp = p; |
2917 |
> |
if ((p = (dir <= 0) ? p.left : p.right) == null) { |
2918 |
> |
TreeNode<K,V> x, f = first; |
2919 |
> |
first = x = new TreeNode<K,V>(h, k, v, f, xp); |
2920 |
> |
if (f != null) |
2921 |
> |
f.prev = x; |
2922 |
> |
if (dir <= 0) |
2923 |
> |
xp.left = x; |
2924 |
> |
else |
2925 |
> |
xp.right = x; |
2926 |
> |
if (!xp.red) |
2927 |
> |
x.red = true; |
2928 |
> |
else { |
2929 |
> |
lockRoot(); |
2930 |
> |
try { |
2931 |
> |
root = balanceInsertion(root, x); |
2932 |
> |
} finally { |
2933 |
> |
unlockRoot(); |
2934 |
> |
} |
2935 |
> |
} |
2936 |
> |
break; |
2937 |
> |
} |
2938 |
> |
} |
2939 |
> |
assert checkInvariants(root); |
2940 |
> |
return null; |
2941 |
> |
} |
2942 |
> |
|
2943 |
> |
/** |
2944 |
> |
* Removes the given node, that must be present before this |
2945 |
> |
* call. This is messier than typical red-black deletion code |
2946 |
> |
* because we cannot swap the contents of an interior node |
2947 |
> |
* with a leaf successor that is pinned by "next" pointers |
2948 |
> |
* that are accessible independently of lock. So instead we |
2949 |
> |
* swap the tree linkages. |
2950 |
> |
* |
2951 |
> |
* @return true if now too small, so should be untreeified |
2952 |
> |
*/ |
2953 |
> |
final boolean removeTreeNode(TreeNode<K,V> p) { |
2954 |
> |
TreeNode<K,V> next = (TreeNode<K,V>)p.next; |
2955 |
> |
TreeNode<K,V> pred = p.prev; // unlink traversal pointers |
2956 |
> |
TreeNode<K,V> r, rl; |
2957 |
> |
if (pred == null) |
2958 |
> |
first = next; |
2959 |
> |
else |
2960 |
> |
pred.next = next; |
2961 |
> |
if (next != null) |
2962 |
> |
next.prev = pred; |
2963 |
> |
if (first == null) { |
2964 |
> |
root = null; |
2965 |
> |
return true; |
2966 |
> |
} |
2967 |
> |
if ((r = root) == null || r.right == null || // too small |
2968 |
> |
(rl = r.left) == null || rl.left == null) |
2969 |
> |
return true; |
2970 |
> |
lockRoot(); |
2971 |
> |
try { |
2972 |
> |
TreeNode<K,V> replacement; |
2973 |
> |
TreeNode<K,V> pl = p.left; |
2974 |
> |
TreeNode<K,V> pr = p.right; |
2975 |
> |
if (pl != null && pr != null) { |
2976 |
> |
TreeNode<K,V> s = pr, sl; |
2977 |
> |
while ((sl = s.left) != null) // find successor |
2978 |
> |
s = sl; |
2979 |
> |
boolean c = s.red; s.red = p.red; p.red = c; // swap colors |
2980 |
> |
TreeNode<K,V> sr = s.right; |
2981 |
> |
TreeNode<K,V> pp = p.parent; |
2982 |
> |
if (s == pr) { // p was s's direct parent |
2983 |
> |
p.parent = s; |
2984 |
> |
s.right = p; |
2985 |
> |
} |
2986 |
> |
else { |
2987 |
> |
TreeNode<K,V> sp = s.parent; |
2988 |
> |
if ((p.parent = sp) != null) { |
2989 |
> |
if (s == sp.left) |
2990 |
> |
sp.left = p; |
2991 |
> |
else |
2992 |
> |
sp.right = p; |
2993 |
> |
} |
2994 |
> |
if ((s.right = pr) != null) |
2995 |
> |
pr.parent = s; |
2996 |
> |
} |
2997 |
> |
p.left = null; |
2998 |
> |
if ((p.right = sr) != null) |
2999 |
> |
sr.parent = p; |
3000 |
> |
if ((s.left = pl) != null) |
3001 |
> |
pl.parent = s; |
3002 |
> |
if ((s.parent = pp) == null) |
3003 |
> |
r = s; |
3004 |
> |
else if (p == pp.left) |
3005 |
> |
pp.left = s; |
3006 |
> |
else |
3007 |
> |
pp.right = s; |
3008 |
> |
if (sr != null) |
3009 |
> |
replacement = sr; |
3010 |
> |
else |
3011 |
> |
replacement = p; |
3012 |
> |
} |
3013 |
> |
else if (pl != null) |
3014 |
> |
replacement = pl; |
3015 |
> |
else if (pr != null) |
3016 |
> |
replacement = pr; |
3017 |
> |
else |
3018 |
> |
replacement = p; |
3019 |
> |
if (replacement != p) { |
3020 |
> |
TreeNode<K,V> pp = replacement.parent = p.parent; |
3021 |
> |
if (pp == null) |
3022 |
> |
r = replacement; |
3023 |
> |
else if (p == pp.left) |
3024 |
> |
pp.left = replacement; |
3025 |
> |
else |
3026 |
> |
pp.right = replacement; |
3027 |
> |
p.left = p.right = p.parent = null; |
3028 |
> |
} |
3029 |
> |
|
3030 |
> |
root = (p.red) ? r : balanceDeletion(r, replacement); |
3031 |
> |
|
3032 |
> |
if (p == replacement) { // detach pointers |
3033 |
> |
TreeNode<K,V> pp; |
3034 |
> |
if ((pp = p.parent) != null) { |
3035 |
> |
if (p == pp.left) |
3036 |
> |
pp.left = null; |
3037 |
> |
else if (p == pp.right) |
3038 |
> |
pp.right = null; |
3039 |
> |
p.parent = null; |
3040 |
> |
} |
3041 |
> |
} |
3042 |
> |
} finally { |
3043 |
> |
unlockRoot(); |
3044 |
> |
} |
3045 |
> |
assert checkInvariants(root); |
3046 |
> |
return false; |
3047 |
> |
} |
3048 |
> |
|
3049 |
> |
/* ------------------------------------------------------------ */ |
3050 |
> |
// Red-black tree methods, all adapted from CLR |
3051 |
> |
|
3052 |
> |
static <K,V> TreeNode<K,V> rotateLeft(TreeNode<K,V> root, |
3053 |
> |
TreeNode<K,V> p) { |
3054 |
> |
TreeNode<K,V> r, pp, rl; |
3055 |
> |
if (p != null && (r = p.right) != null) { |
3056 |
> |
if ((rl = p.right = r.left) != null) |
3057 |
> |
rl.parent = p; |
3058 |
> |
if ((pp = r.parent = p.parent) == null) |
3059 |
> |
(root = r).red = false; |
3060 |
> |
else if (pp.left == p) |
3061 |
> |
pp.left = r; |
3062 |
> |
else |
3063 |
> |
pp.right = r; |
3064 |
> |
r.left = p; |
3065 |
> |
p.parent = r; |
3066 |
> |
} |
3067 |
> |
return root; |
3068 |
> |
} |
3069 |
> |
|
3070 |
> |
static <K,V> TreeNode<K,V> rotateRight(TreeNode<K,V> root, |
3071 |
> |
TreeNode<K,V> p) { |
3072 |
> |
TreeNode<K,V> l, pp, lr; |
3073 |
> |
if (p != null && (l = p.left) != null) { |
3074 |
> |
if ((lr = p.left = l.right) != null) |
3075 |
> |
lr.parent = p; |
3076 |
> |
if ((pp = l.parent = p.parent) == null) |
3077 |
> |
(root = l).red = false; |
3078 |
> |
else if (pp.right == p) |
3079 |
> |
pp.right = l; |
3080 |
> |
else |
3081 |
> |
pp.left = l; |
3082 |
> |
l.right = p; |
3083 |
> |
p.parent = l; |
3084 |
> |
} |
3085 |
> |
return root; |
3086 |
> |
} |
3087 |
> |
|
3088 |
> |
static <K,V> TreeNode<K,V> balanceInsertion(TreeNode<K,V> root, |
3089 |
> |
TreeNode<K,V> x) { |
3090 |
> |
x.red = true; |
3091 |
> |
for (TreeNode<K,V> xp, xpp, xppl, xppr;;) { |
3092 |
> |
if ((xp = x.parent) == null) { |
3093 |
> |
x.red = false; |
3094 |
> |
return x; |
3095 |
> |
} |
3096 |
> |
else if (!xp.red || (xpp = xp.parent) == null) |
3097 |
> |
return root; |
3098 |
> |
if (xp == (xppl = xpp.left)) { |
3099 |
> |
if ((xppr = xpp.right) != null && xppr.red) { |
3100 |
> |
xppr.red = false; |
3101 |
> |
xp.red = false; |
3102 |
> |
xpp.red = true; |
3103 |
> |
x = xpp; |
3104 |
> |
} |
3105 |
> |
else { |
3106 |
> |
if (x == xp.right) { |
3107 |
> |
root = rotateLeft(root, x = xp); |
3108 |
> |
xpp = (xp = x.parent) == null ? null : xp.parent; |
3109 |
> |
} |
3110 |
> |
if (xp != null) { |
3111 |
> |
xp.red = false; |
3112 |
> |
if (xpp != null) { |
3113 |
> |
xpp.red = true; |
3114 |
> |
root = rotateRight(root, xpp); |
3115 |
> |
} |
3116 |
> |
} |
3117 |
> |
} |
3118 |
> |
} |
3119 |
> |
else { |
3120 |
> |
if (xppl != null && xppl.red) { |
3121 |
> |
xppl.red = false; |
3122 |
> |
xp.red = false; |
3123 |
> |
xpp.red = true; |
3124 |
> |
x = xpp; |
3125 |
> |
} |
3126 |
> |
else { |
3127 |
> |
if (x == xp.left) { |
3128 |
> |
root = rotateRight(root, x = xp); |
3129 |
> |
xpp = (xp = x.parent) == null ? null : xp.parent; |
3130 |
> |
} |
3131 |
> |
if (xp != null) { |
3132 |
> |
xp.red = false; |
3133 |
> |
if (xpp != null) { |
3134 |
> |
xpp.red = true; |
3135 |
> |
root = rotateLeft(root, xpp); |
3136 |
> |
} |
3137 |
> |
} |
3138 |
> |
} |
3139 |
> |
} |
3140 |
> |
} |
3141 |
> |
} |
3142 |
> |
|
3143 |
> |
static <K,V> TreeNode<K,V> balanceDeletion(TreeNode<K,V> root, |
3144 |
> |
TreeNode<K,V> x) { |
3145 |
> |
for (TreeNode<K,V> xp, xpl, xpr;;) { |
3146 |
> |
if (x == null || x == root) |
3147 |
> |
return root; |
3148 |
> |
else if ((xp = x.parent) == null) { |
3149 |
> |
x.red = false; |
3150 |
> |
return x; |
3151 |
> |
} |
3152 |
> |
else if (x.red) { |
3153 |
> |
x.red = false; |
3154 |
> |
return root; |
3155 |
> |
} |
3156 |
> |
else if ((xpl = xp.left) == x) { |
3157 |
> |
if ((xpr = xp.right) != null && xpr.red) { |
3158 |
> |
xpr.red = false; |
3159 |
> |
xp.red = true; |
3160 |
> |
root = rotateLeft(root, xp); |
3161 |
> |
xpr = (xp = x.parent) == null ? null : xp.right; |
3162 |
> |
} |
3163 |
> |
if (xpr == null) |
3164 |
> |
x = xp; |
3165 |
> |
else { |
3166 |
> |
TreeNode<K,V> sl = xpr.left, sr = xpr.right; |
3167 |
> |
if ((sr == null || !sr.red) && |
3168 |
> |
(sl == null || !sl.red)) { |
3169 |
> |
xpr.red = true; |
3170 |
> |
x = xp; |
3171 |
> |
} |
3172 |
> |
else { |
3173 |
> |
if (sr == null || !sr.red) { |
3174 |
> |
if (sl != null) |
3175 |
> |
sl.red = false; |
3176 |
> |
xpr.red = true; |
3177 |
> |
root = rotateRight(root, xpr); |
3178 |
> |
xpr = (xp = x.parent) == null ? |
3179 |
> |
null : xp.right; |
3180 |
> |
} |
3181 |
> |
if (xpr != null) { |
3182 |
> |
xpr.red = (xp == null) ? false : xp.red; |
3183 |
> |
if ((sr = xpr.right) != null) |
3184 |
> |
sr.red = false; |
3185 |
> |
} |
3186 |
> |
if (xp != null) { |
3187 |
> |
xp.red = false; |
3188 |
> |
root = rotateLeft(root, xp); |
3189 |
> |
} |
3190 |
> |
x = root; |
3191 |
> |
} |
3192 |
> |
} |
3193 |
> |
} |
3194 |
> |
else { // symmetric |
3195 |
> |
if (xpl != null && xpl.red) { |
3196 |
> |
xpl.red = false; |
3197 |
> |
xp.red = true; |
3198 |
> |
root = rotateRight(root, xp); |
3199 |
> |
xpl = (xp = x.parent) == null ? null : xp.left; |
3200 |
> |
} |
3201 |
> |
if (xpl == null) |
3202 |
> |
x = xp; |
3203 |
> |
else { |
3204 |
> |
TreeNode<K,V> sl = xpl.left, sr = xpl.right; |
3205 |
> |
if ((sl == null || !sl.red) && |
3206 |
> |
(sr == null || !sr.red)) { |
3207 |
> |
xpl.red = true; |
3208 |
> |
x = xp; |
3209 |
> |
} |
3210 |
> |
else { |
3211 |
> |
if (sl == null || !sl.red) { |
3212 |
> |
if (sr != null) |
3213 |
> |
sr.red = false; |
3214 |
> |
xpl.red = true; |
3215 |
> |
root = rotateLeft(root, xpl); |
3216 |
> |
xpl = (xp = x.parent) == null ? |
3217 |
> |
null : xp.left; |
3218 |
> |
} |
3219 |
> |
if (xpl != null) { |
3220 |
> |
xpl.red = (xp == null) ? false : xp.red; |
3221 |
> |
if ((sl = xpl.left) != null) |
3222 |
> |
sl.red = false; |
3223 |
> |
} |
3224 |
> |
if (xp != null) { |
3225 |
> |
xp.red = false; |
3226 |
> |
root = rotateRight(root, xp); |
3227 |
> |
} |
3228 |
> |
x = root; |
3229 |
> |
} |
3230 |
> |
} |
3231 |
> |
} |
3232 |
> |
} |
3233 |
> |
} |
3234 |
> |
|
3235 |
> |
/** |
3236 |
> |
* Checks invariants recursively for the tree of Nodes rooted at t. |
3237 |
> |
*/ |
3238 |
> |
static <K,V> boolean checkInvariants(TreeNode<K,V> t) { |
3239 |
> |
TreeNode<K,V> tp = t.parent, tl = t.left, tr = t.right, |
3240 |
> |
tb = t.prev, tn = (TreeNode<K,V>)t.next; |
3241 |
> |
if (tb != null && tb.next != t) |
3242 |
> |
return false; |
3243 |
> |
if (tn != null && tn.prev != t) |
3244 |
> |
return false; |
3245 |
> |
if (tp != null && t != tp.left && t != tp.right) |
3246 |
> |
return false; |
3247 |
> |
if (tl != null && (tl.parent != t || tl.hash > t.hash)) |
3248 |
> |
return false; |
3249 |
> |
if (tr != null && (tr.parent != t || tr.hash < t.hash)) |
3250 |
> |
return false; |
3251 |
> |
if (t.red && tl != null && tl.red && tr != null && tr.red) |
3252 |
> |
return false; |
3253 |
> |
if (tl != null && !checkInvariants(tl)) |
3254 |
> |
return false; |
3255 |
> |
if (tr != null && !checkInvariants(tr)) |
3256 |
> |
return false; |
3257 |
> |
return true; |
3258 |
> |
} |
3259 |
> |
|
3260 |
> |
private static final long LOCKSTATE = U.objectFieldOffset( |
3261 |
> |
TreeBin.class, "lockState"); |
3262 |
> |
} |
3263 |
> |
|
3264 |
> |
/* ----------------Table Traversal -------------- */ |
3265 |
> |
|
3266 |
> |
/** |
3267 |
> |
* Records the table, its length, and current traversal index for a |
3268 |
> |
* traverser that must process a region of a forwarded table before |
3269 |
> |
* proceeding with current table. |
3270 |
> |
*/ |
3271 |
> |
static final class TableStack<K,V> { |
3272 |
> |
int length; |
3273 |
> |
int index; |
3274 |
> |
Node<K,V>[] tab; |
3275 |
> |
TableStack<K,V> next; |
3276 |
> |
} |
3277 |
> |
|
3278 |
> |
/** |
3279 |
> |
* Encapsulates traversal for methods such as containsValue; also |
3280 |
> |
* serves as a base class for other iterators and spliterators. |
3281 |
> |
* |
3282 |
> |
* Method advance visits once each still-valid node that was |
3283 |
> |
* reachable upon iterator construction. It might miss some that |
3284 |
> |
* were added to a bin after the bin was visited, which is OK wrt |
3285 |
> |
* consistency guarantees. Maintaining this property in the face |
3286 |
> |
* of possible ongoing resizes requires a fair amount of |
3287 |
> |
* bookkeeping state that is difficult to optimize away amidst |
3288 |
> |
* volatile accesses. Even so, traversal maintains reasonable |
3289 |
> |
* throughput. |
3290 |
> |
* |
3291 |
> |
* Normally, iteration proceeds bin-by-bin traversing lists. |
3292 |
> |
* However, if the table has been resized, then all future steps |
3293 |
> |
* must traverse both the bin at the current index as well as at |
3294 |
> |
* (index + baseSize); and so on for further resizings. To |
3295 |
> |
* paranoically cope with potential sharing by users of iterators |
3296 |
> |
* across threads, iteration terminates if a bounds checks fails |
3297 |
> |
* for a table read. |
3298 |
> |
*/ |
3299 |
> |
static class Traverser<K,V> { |
3300 |
> |
Node<K,V>[] tab; // current table; updated if resized |
3301 |
> |
Node<K,V> next; // the next entry to use |
3302 |
> |
TableStack<K,V> stack, spare; // to save/restore on ForwardingNodes |
3303 |
> |
int index; // index of bin to use next |
3304 |
> |
int baseIndex; // current index of initial table |
3305 |
> |
int baseLimit; // index bound for initial table |
3306 |
> |
final int baseSize; // initial table size |
3307 |
> |
|
3308 |
> |
Traverser(Node<K,V>[] tab, int size, int index, int limit) { |
3309 |
> |
this.tab = tab; |
3310 |
> |
this.baseSize = size; |
3311 |
> |
this.baseIndex = this.index = index; |
3312 |
> |
this.baseLimit = limit; |
3313 |
> |
this.next = null; |
3314 |
> |
} |
3315 |
> |
|
3316 |
> |
/** |
3317 |
> |
* Advances if possible, returning next valid node, or null if none. |
3318 |
> |
*/ |
3319 |
> |
final Node<K,V> advance() { |
3320 |
> |
Node<K,V> e; |
3321 |
> |
if ((e = next) != null) |
3322 |
> |
e = e.next; |
3323 |
> |
for (;;) { |
3324 |
> |
Node<K,V>[] t; int i, n; // must use locals in checks |
3325 |
> |
if (e != null) |
3326 |
> |
return next = e; |
3327 |
> |
if (baseIndex >= baseLimit || (t = tab) == null || |
3328 |
> |
(n = t.length) <= (i = index) || i < 0) |
3329 |
> |
return next = null; |
3330 |
> |
if ((e = tabAt(t, i)) != null && e.hash < 0) { |
3331 |
> |
if (e instanceof ForwardingNode) { |
3332 |
> |
tab = ((ForwardingNode<K,V>)e).nextTable; |
3333 |
> |
e = null; |
3334 |
> |
pushState(t, i, n); |
3335 |
> |
continue; |
3336 |
> |
} |
3337 |
> |
else if (e instanceof TreeBin) |
3338 |
> |
e = ((TreeBin<K,V>)e).first; |
3339 |
> |
else |
3340 |
> |
e = null; |
3341 |
> |
} |
3342 |
> |
if (stack != null) |
3343 |
> |
recoverState(n); |
3344 |
> |
else if ((index = i + baseSize) >= n) |
3345 |
> |
index = ++baseIndex; // visit upper slots if present |
3346 |
> |
} |
3347 |
> |
} |
3348 |
> |
|
3349 |
> |
/** |
3350 |
> |
* Saves traversal state upon encountering a forwarding node. |
3351 |
> |
*/ |
3352 |
> |
private void pushState(Node<K,V>[] t, int i, int n) { |
3353 |
> |
TableStack<K,V> s = spare; // reuse if possible |
3354 |
> |
if (s != null) |
3355 |
> |
spare = s.next; |
3356 |
> |
else |
3357 |
> |
s = new TableStack<K,V>(); |
3358 |
> |
s.tab = t; |
3359 |
> |
s.length = n; |
3360 |
> |
s.index = i; |
3361 |
> |
s.next = stack; |
3362 |
> |
stack = s; |
3363 |
> |
} |
3364 |
> |
|
3365 |
> |
/** |
3366 |
> |
* Possibly pops traversal state. |
3367 |
> |
* |
3368 |
> |
* @param n length of current table |
3369 |
> |
*/ |
3370 |
> |
private void recoverState(int n) { |
3371 |
> |
TableStack<K,V> s; int len; |
3372 |
> |
while ((s = stack) != null && (index += (len = s.length)) >= n) { |
3373 |
> |
n = len; |
3374 |
> |
index = s.index; |
3375 |
> |
tab = s.tab; |
3376 |
> |
s.tab = null; |
3377 |
> |
TableStack<K,V> next = s.next; |
3378 |
> |
s.next = spare; // save for reuse |
3379 |
> |
stack = next; |
3380 |
> |
spare = s; |
3381 |
> |
} |
3382 |
> |
if (s == null && (index += baseSize) >= n) |
3383 |
> |
index = ++baseIndex; |
3384 |
> |
} |
3385 |
> |
} |
3386 |
> |
|
3387 |
> |
/** |
3388 |
> |
* Base of key, value, and entry Iterators. Adds fields to |
3389 |
> |
* Traverser to support iterator.remove. |
3390 |
> |
*/ |
3391 |
> |
static class BaseIterator<K,V> extends Traverser<K,V> { |
3392 |
> |
final ConcurrentHashMap<K,V> map; |
3393 |
> |
Node<K,V> lastReturned; |
3394 |
> |
BaseIterator(Node<K,V>[] tab, int size, int index, int limit, |
3395 |
> |
ConcurrentHashMap<K,V> map) { |
3396 |
> |
super(tab, size, index, limit); |
3397 |
> |
this.map = map; |
3398 |
|
advance(); |
1098 |
– |
return lastReturned; |
3399 |
|
} |
3400 |
|
|
3401 |
< |
public void remove() { |
3402 |
< |
if (lastReturned == null) |
3401 |
> |
public final boolean hasNext() { return next != null; } |
3402 |
> |
public final boolean hasMoreElements() { return next != null; } |
3403 |
> |
|
3404 |
> |
public final void remove() { |
3405 |
> |
Node<K,V> p; |
3406 |
> |
if ((p = lastReturned) == null) |
3407 |
|
throw new IllegalStateException(); |
1104 |
– |
ConcurrentHashMap.this.remove(lastReturned.key); |
3408 |
|
lastReturned = null; |
3409 |
+ |
map.replaceNode(p.key, null, null); |
3410 |
|
} |
3411 |
|
} |
3412 |
|
|
3413 |
< |
final class KeyIterator |
3414 |
< |
extends HashIterator |
3415 |
< |
implements Iterator<K>, Enumeration<K> |
3416 |
< |
{ |
3417 |
< |
public K next() { return super.nextEntry().key; } |
3418 |
< |
public K nextElement() { return super.nextEntry().key; } |
3413 |
> |
static final class KeyIterator<K,V> extends BaseIterator<K,V> |
3414 |
> |
implements Iterator<K>, Enumeration<K> { |
3415 |
> |
KeyIterator(Node<K,V>[] tab, int size, int index, int limit, |
3416 |
> |
ConcurrentHashMap<K,V> map) { |
3417 |
> |
super(tab, size, index, limit, map); |
3418 |
> |
} |
3419 |
> |
|
3420 |
> |
public final K next() { |
3421 |
> |
Node<K,V> p; |
3422 |
> |
if ((p = next) == null) |
3423 |
> |
throw new NoSuchElementException(); |
3424 |
> |
K k = p.key; |
3425 |
> |
lastReturned = p; |
3426 |
> |
advance(); |
3427 |
> |
return k; |
3428 |
> |
} |
3429 |
> |
|
3430 |
> |
public final K nextElement() { return next(); } |
3431 |
|
} |
3432 |
|
|
3433 |
< |
final class ValueIterator |
3434 |
< |
extends HashIterator |
3435 |
< |
implements Iterator<V>, Enumeration<V> |
3436 |
< |
{ |
3437 |
< |
public V next() { return super.nextEntry().value; } |
3438 |
< |
public V nextElement() { return super.nextEntry().value; } |
3433 |
> |
static final class ValueIterator<K,V> extends BaseIterator<K,V> |
3434 |
> |
implements Iterator<V>, Enumeration<V> { |
3435 |
> |
ValueIterator(Node<K,V>[] tab, int size, int index, int limit, |
3436 |
> |
ConcurrentHashMap<K,V> map) { |
3437 |
> |
super(tab, size, index, limit, map); |
3438 |
> |
} |
3439 |
> |
|
3440 |
> |
public final V next() { |
3441 |
> |
Node<K,V> p; |
3442 |
> |
if ((p = next) == null) |
3443 |
> |
throw new NoSuchElementException(); |
3444 |
> |
V v = p.val; |
3445 |
> |
lastReturned = p; |
3446 |
> |
advance(); |
3447 |
> |
return v; |
3448 |
> |
} |
3449 |
> |
|
3450 |
> |
public final V nextElement() { return next(); } |
3451 |
> |
} |
3452 |
> |
|
3453 |
> |
static final class EntryIterator<K,V> extends BaseIterator<K,V> |
3454 |
> |
implements Iterator<Map.Entry<K,V>> { |
3455 |
> |
EntryIterator(Node<K,V>[] tab, int size, int index, int limit, |
3456 |
> |
ConcurrentHashMap<K,V> map) { |
3457 |
> |
super(tab, size, index, limit, map); |
3458 |
> |
} |
3459 |
> |
|
3460 |
> |
public final Map.Entry<K,V> next() { |
3461 |
> |
Node<K,V> p; |
3462 |
> |
if ((p = next) == null) |
3463 |
> |
throw new NoSuchElementException(); |
3464 |
> |
K k = p.key; |
3465 |
> |
V v = p.val; |
3466 |
> |
lastReturned = p; |
3467 |
> |
advance(); |
3468 |
> |
return new MapEntry<K,V>(k, v, map); |
3469 |
> |
} |
3470 |
|
} |
3471 |
|
|
3472 |
|
/** |
3473 |
< |
* Custom Entry class used by EntryIterator.next(), that relays |
1127 |
< |
* setValue changes to the underlying map. |
3473 |
> |
* Exported Entry for EntryIterator. |
3474 |
|
*/ |
3475 |
< |
final class WriteThroughEntry |
3476 |
< |
extends AbstractMap.SimpleEntry<K,V> |
3477 |
< |
{ |
3478 |
< |
WriteThroughEntry(K k, V v) { |
3479 |
< |
super(k,v); |
3475 |
> |
static final class MapEntry<K,V> implements Map.Entry<K,V> { |
3476 |
> |
final K key; // non-null |
3477 |
> |
V val; // non-null |
3478 |
> |
final ConcurrentHashMap<K,V> map; |
3479 |
> |
MapEntry(K key, V val, ConcurrentHashMap<K,V> map) { |
3480 |
> |
this.key = key; |
3481 |
> |
this.val = val; |
3482 |
> |
this.map = map; |
3483 |
> |
} |
3484 |
> |
public K getKey() { return key; } |
3485 |
> |
public V getValue() { return val; } |
3486 |
> |
public int hashCode() { return key.hashCode() ^ val.hashCode(); } |
3487 |
> |
public String toString() { |
3488 |
> |
return Helpers.mapEntryToString(key, val); |
3489 |
> |
} |
3490 |
> |
|
3491 |
> |
public boolean equals(Object o) { |
3492 |
> |
Object k, v; Map.Entry<?,?> e; |
3493 |
> |
return ((o instanceof Map.Entry) && |
3494 |
> |
(k = (e = (Map.Entry<?,?>)o).getKey()) != null && |
3495 |
> |
(v = e.getValue()) != null && |
3496 |
> |
(k == key || k.equals(key)) && |
3497 |
> |
(v == val || v.equals(val))); |
3498 |
|
} |
3499 |
|
|
3500 |
|
/** |
3501 |
< |
* Set our entry's value and write through to the map. The |
3502 |
< |
* value to return is somewhat arbitrary here. Since a |
3503 |
< |
* WriteThroughEntry does not necessarily track asynchronous |
3504 |
< |
* changes, the most recent "previous" value could be |
3505 |
< |
* different from what we return (or could even have been |
3506 |
< |
* removed in which case the put will re-establish). We do not |
1143 |
< |
* and cannot guarantee more. |
3501 |
> |
* Sets our entry's value and writes through to the map. The |
3502 |
> |
* value to return is somewhat arbitrary here. Since we do not |
3503 |
> |
* necessarily track asynchronous changes, the most recent |
3504 |
> |
* "previous" value could be different from what we return (or |
3505 |
> |
* could even have been removed, in which case the put will |
3506 |
> |
* re-establish). We do not and cannot guarantee more. |
3507 |
|
*/ |
3508 |
< |
public V setValue(V value) { |
3508 |
> |
public V setValue(V value) { |
3509 |
|
if (value == null) throw new NullPointerException(); |
3510 |
< |
V v = super.setValue(value); |
3511 |
< |
ConcurrentHashMap.this.put(getKey(), value); |
3510 |
> |
V v = val; |
3511 |
> |
val = value; |
3512 |
> |
map.put(key, value); |
3513 |
|
return v; |
3514 |
|
} |
3515 |
|
} |
3516 |
|
|
3517 |
< |
final class EntryIterator |
3518 |
< |
extends HashIterator |
3519 |
< |
implements Iterator<Entry<K,V>> |
3520 |
< |
{ |
3521 |
< |
public Map.Entry<K,V> next() { |
3522 |
< |
HashEntry<K,V> e = super.nextEntry(); |
3523 |
< |
return new WriteThroughEntry(e.key, e.value); |
3517 |
> |
static final class KeySpliterator<K,V> extends Traverser<K,V> |
3518 |
> |
implements Spliterator<K> { |
3519 |
> |
long est; // size estimate |
3520 |
> |
KeySpliterator(Node<K,V>[] tab, int size, int index, int limit, |
3521 |
> |
long est) { |
3522 |
> |
super(tab, size, index, limit); |
3523 |
> |
this.est = est; |
3524 |
> |
} |
3525 |
> |
|
3526 |
> |
public KeySpliterator<K,V> trySplit() { |
3527 |
> |
int i, f, h; |
3528 |
> |
return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null : |
3529 |
> |
new KeySpliterator<K,V>(tab, baseSize, baseLimit = h, |
3530 |
> |
f, est >>>= 1); |
3531 |
> |
} |
3532 |
> |
|
3533 |
> |
public void forEachRemaining(Consumer<? super K> action) { |
3534 |
> |
if (action == null) throw new NullPointerException(); |
3535 |
> |
for (Node<K,V> p; (p = advance()) != null;) |
3536 |
> |
action.accept(p.key); |
3537 |
> |
} |
3538 |
> |
|
3539 |
> |
public boolean tryAdvance(Consumer<? super K> action) { |
3540 |
> |
if (action == null) throw new NullPointerException(); |
3541 |
> |
Node<K,V> p; |
3542 |
> |
if ((p = advance()) == null) |
3543 |
> |
return false; |
3544 |
> |
action.accept(p.key); |
3545 |
> |
return true; |
3546 |
> |
} |
3547 |
> |
|
3548 |
> |
public long estimateSize() { return est; } |
3549 |
> |
|
3550 |
> |
public int characteristics() { |
3551 |
> |
return Spliterator.DISTINCT | Spliterator.CONCURRENT | |
3552 |
> |
Spliterator.NONNULL; |
3553 |
|
} |
3554 |
|
} |
3555 |
|
|
3556 |
< |
final class KeySet extends AbstractSet<K> { |
3557 |
< |
public Iterator<K> iterator() { |
3558 |
< |
return new KeyIterator(); |
3556 |
> |
static final class ValueSpliterator<K,V> extends Traverser<K,V> |
3557 |
> |
implements Spliterator<V> { |
3558 |
> |
long est; // size estimate |
3559 |
> |
ValueSpliterator(Node<K,V>[] tab, int size, int index, int limit, |
3560 |
> |
long est) { |
3561 |
> |
super(tab, size, index, limit); |
3562 |
> |
this.est = est; |
3563 |
> |
} |
3564 |
> |
|
3565 |
> |
public ValueSpliterator<K,V> trySplit() { |
3566 |
> |
int i, f, h; |
3567 |
> |
return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null : |
3568 |
> |
new ValueSpliterator<K,V>(tab, baseSize, baseLimit = h, |
3569 |
> |
f, est >>>= 1); |
3570 |
> |
} |
3571 |
> |
|
3572 |
> |
public void forEachRemaining(Consumer<? super V> action) { |
3573 |
> |
if (action == null) throw new NullPointerException(); |
3574 |
> |
for (Node<K,V> p; (p = advance()) != null;) |
3575 |
> |
action.accept(p.val); |
3576 |
> |
} |
3577 |
> |
|
3578 |
> |
public boolean tryAdvance(Consumer<? super V> action) { |
3579 |
> |
if (action == null) throw new NullPointerException(); |
3580 |
> |
Node<K,V> p; |
3581 |
> |
if ((p = advance()) == null) |
3582 |
> |
return false; |
3583 |
> |
action.accept(p.val); |
3584 |
> |
return true; |
3585 |
|
} |
3586 |
< |
public int size() { |
3587 |
< |
return ConcurrentHashMap.this.size(); |
3586 |
> |
|
3587 |
> |
public long estimateSize() { return est; } |
3588 |
> |
|
3589 |
> |
public int characteristics() { |
3590 |
> |
return Spliterator.CONCURRENT | Spliterator.NONNULL; |
3591 |
|
} |
3592 |
< |
public boolean contains(Object o) { |
3593 |
< |
return ConcurrentHashMap.this.containsKey(o); |
3592 |
> |
} |
3593 |
> |
|
3594 |
> |
static final class EntrySpliterator<K,V> extends Traverser<K,V> |
3595 |
> |
implements Spliterator<Map.Entry<K,V>> { |
3596 |
> |
final ConcurrentHashMap<K,V> map; // To export MapEntry |
3597 |
> |
long est; // size estimate |
3598 |
> |
EntrySpliterator(Node<K,V>[] tab, int size, int index, int limit, |
3599 |
> |
long est, ConcurrentHashMap<K,V> map) { |
3600 |
> |
super(tab, size, index, limit); |
3601 |
> |
this.map = map; |
3602 |
> |
this.est = est; |
3603 |
> |
} |
3604 |
> |
|
3605 |
> |
public EntrySpliterator<K,V> trySplit() { |
3606 |
> |
int i, f, h; |
3607 |
> |
return (h = ((i = baseIndex) + (f = baseLimit)) >>> 1) <= i ? null : |
3608 |
> |
new EntrySpliterator<K,V>(tab, baseSize, baseLimit = h, |
3609 |
> |
f, est >>>= 1, map); |
3610 |
> |
} |
3611 |
> |
|
3612 |
> |
public void forEachRemaining(Consumer<? super Map.Entry<K,V>> action) { |
3613 |
> |
if (action == null) throw new NullPointerException(); |
3614 |
> |
for (Node<K,V> p; (p = advance()) != null; ) |
3615 |
> |
action.accept(new MapEntry<K,V>(p.key, p.val, map)); |
3616 |
> |
} |
3617 |
> |
|
3618 |
> |
public boolean tryAdvance(Consumer<? super Map.Entry<K,V>> action) { |
3619 |
> |
if (action == null) throw new NullPointerException(); |
3620 |
> |
Node<K,V> p; |
3621 |
> |
if ((p = advance()) == null) |
3622 |
> |
return false; |
3623 |
> |
action.accept(new MapEntry<K,V>(p.key, p.val, map)); |
3624 |
> |
return true; |
3625 |
|
} |
3626 |
< |
public boolean remove(Object o) { |
3627 |
< |
return ConcurrentHashMap.this.remove(o) != null; |
3626 |
> |
|
3627 |
> |
public long estimateSize() { return est; } |
3628 |
> |
|
3629 |
> |
public int characteristics() { |
3630 |
> |
return Spliterator.DISTINCT | Spliterator.CONCURRENT | |
3631 |
> |
Spliterator.NONNULL; |
3632 |
|
} |
3633 |
< |
public void clear() { |
3634 |
< |
ConcurrentHashMap.this.clear(); |
3633 |
> |
} |
3634 |
> |
|
3635 |
> |
// Parallel bulk operations |
3636 |
> |
|
3637 |
> |
/** |
3638 |
> |
* Computes initial batch value for bulk tasks. The returned value |
3639 |
> |
* is approximately exp2 of the number of times (minus one) to |
3640 |
> |
* split task by two before executing leaf action. This value is |
3641 |
> |
* faster to compute and more convenient to use as a guide to |
3642 |
> |
* splitting than is the depth, since it is used while dividing by |
3643 |
> |
* two anyway. |
3644 |
> |
*/ |
3645 |
> |
final int batchFor(long b) { |
3646 |
> |
long n; |
3647 |
> |
if (b == Long.MAX_VALUE || (n = sumCount()) <= 1L || n < b) |
3648 |
> |
return 0; |
3649 |
> |
int sp = ForkJoinPool.getCommonPoolParallelism() << 2; // slack of 4 |
3650 |
> |
return (b <= 0L || (n /= b) >= sp) ? sp : (int)n; |
3651 |
> |
} |
3652 |
> |
|
3653 |
> |
/** |
3654 |
> |
* Performs the given action for each (key, value). |
3655 |
> |
* |
3656 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3657 |
> |
* needed for this operation to be executed in parallel |
3658 |
> |
* @param action the action |
3659 |
> |
* @since 1.8 |
3660 |
> |
*/ |
3661 |
> |
public void forEach(long parallelismThreshold, |
3662 |
> |
BiConsumer<? super K,? super V> action) { |
3663 |
> |
if (action == null) throw new NullPointerException(); |
3664 |
> |
new ForEachMappingTask<K,V> |
3665 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3666 |
> |
action).invoke(); |
3667 |
> |
} |
3668 |
> |
|
3669 |
> |
/** |
3670 |
> |
* Performs the given action for each non-null transformation |
3671 |
> |
* of each (key, value). |
3672 |
> |
* |
3673 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3674 |
> |
* needed for this operation to be executed in parallel |
3675 |
> |
* @param transformer a function returning the transformation |
3676 |
> |
* for an element, or null if there is no transformation (in |
3677 |
> |
* which case the action is not applied) |
3678 |
> |
* @param action the action |
3679 |
> |
* @param <U> the return type of the transformer |
3680 |
> |
* @since 1.8 |
3681 |
> |
*/ |
3682 |
> |
public <U> void forEach(long parallelismThreshold, |
3683 |
> |
BiFunction<? super K, ? super V, ? extends U> transformer, |
3684 |
> |
Consumer<? super U> action) { |
3685 |
> |
if (transformer == null || action == null) |
3686 |
> |
throw new NullPointerException(); |
3687 |
> |
new ForEachTransformedMappingTask<K,V,U> |
3688 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3689 |
> |
transformer, action).invoke(); |
3690 |
> |
} |
3691 |
> |
|
3692 |
> |
/** |
3693 |
> |
* Returns a non-null result from applying the given search |
3694 |
> |
* function on each (key, value), or null if none. Upon |
3695 |
> |
* success, further element processing is suppressed and the |
3696 |
> |
* results of any other parallel invocations of the search |
3697 |
> |
* function are ignored. |
3698 |
> |
* |
3699 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3700 |
> |
* needed for this operation to be executed in parallel |
3701 |
> |
* @param searchFunction a function returning a non-null |
3702 |
> |
* result on success, else null |
3703 |
> |
* @param <U> the return type of the search function |
3704 |
> |
* @return a non-null result from applying the given search |
3705 |
> |
* function on each (key, value), or null if none |
3706 |
> |
* @since 1.8 |
3707 |
> |
*/ |
3708 |
> |
public <U> U search(long parallelismThreshold, |
3709 |
> |
BiFunction<? super K, ? super V, ? extends U> searchFunction) { |
3710 |
> |
if (searchFunction == null) throw new NullPointerException(); |
3711 |
> |
return new SearchMappingsTask<K,V,U> |
3712 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3713 |
> |
searchFunction, new AtomicReference<U>()).invoke(); |
3714 |
> |
} |
3715 |
> |
|
3716 |
> |
/** |
3717 |
> |
* Returns the result of accumulating the given transformation |
3718 |
> |
* of all (key, value) pairs using the given reducer to |
3719 |
> |
* combine values, or null if none. |
3720 |
> |
* |
3721 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3722 |
> |
* needed for this operation to be executed in parallel |
3723 |
> |
* @param transformer a function returning the transformation |
3724 |
> |
* for an element, or null if there is no transformation (in |
3725 |
> |
* which case it is not combined) |
3726 |
> |
* @param reducer a commutative associative combining function |
3727 |
> |
* @param <U> the return type of the transformer |
3728 |
> |
* @return the result of accumulating the given transformation |
3729 |
> |
* of all (key, value) pairs |
3730 |
> |
* @since 1.8 |
3731 |
> |
*/ |
3732 |
> |
public <U> U reduce(long parallelismThreshold, |
3733 |
> |
BiFunction<? super K, ? super V, ? extends U> transformer, |
3734 |
> |
BiFunction<? super U, ? super U, ? extends U> reducer) { |
3735 |
> |
if (transformer == null || reducer == null) |
3736 |
> |
throw new NullPointerException(); |
3737 |
> |
return new MapReduceMappingsTask<K,V,U> |
3738 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3739 |
> |
null, transformer, reducer).invoke(); |
3740 |
> |
} |
3741 |
> |
|
3742 |
> |
/** |
3743 |
> |
* Returns the result of accumulating the given transformation |
3744 |
> |
* of all (key, value) pairs using the given reducer to |
3745 |
> |
* combine values, and the given basis as an identity value. |
3746 |
> |
* |
3747 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3748 |
> |
* needed for this operation to be executed in parallel |
3749 |
> |
* @param transformer a function returning the transformation |
3750 |
> |
* for an element |
3751 |
> |
* @param basis the identity (initial default value) for the reduction |
3752 |
> |
* @param reducer a commutative associative combining function |
3753 |
> |
* @return the result of accumulating the given transformation |
3754 |
> |
* of all (key, value) pairs |
3755 |
> |
* @since 1.8 |
3756 |
> |
*/ |
3757 |
> |
public double reduceToDouble(long parallelismThreshold, |
3758 |
> |
ToDoubleBiFunction<? super K, ? super V> transformer, |
3759 |
> |
double basis, |
3760 |
> |
DoubleBinaryOperator reducer) { |
3761 |
> |
if (transformer == null || reducer == null) |
3762 |
> |
throw new NullPointerException(); |
3763 |
> |
return new MapReduceMappingsToDoubleTask<K,V> |
3764 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3765 |
> |
null, transformer, basis, reducer).invoke(); |
3766 |
> |
} |
3767 |
> |
|
3768 |
> |
/** |
3769 |
> |
* Returns the result of accumulating the given transformation |
3770 |
> |
* of all (key, value) pairs using the given reducer to |
3771 |
> |
* combine values, and the given basis as an identity value. |
3772 |
> |
* |
3773 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3774 |
> |
* needed for this operation to be executed in parallel |
3775 |
> |
* @param transformer a function returning the transformation |
3776 |
> |
* for an element |
3777 |
> |
* @param basis the identity (initial default value) for the reduction |
3778 |
> |
* @param reducer a commutative associative combining function |
3779 |
> |
* @return the result of accumulating the given transformation |
3780 |
> |
* of all (key, value) pairs |
3781 |
> |
* @since 1.8 |
3782 |
> |
*/ |
3783 |
> |
public long reduceToLong(long parallelismThreshold, |
3784 |
> |
ToLongBiFunction<? super K, ? super V> transformer, |
3785 |
> |
long basis, |
3786 |
> |
LongBinaryOperator reducer) { |
3787 |
> |
if (transformer == null || reducer == null) |
3788 |
> |
throw new NullPointerException(); |
3789 |
> |
return new MapReduceMappingsToLongTask<K,V> |
3790 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3791 |
> |
null, transformer, basis, reducer).invoke(); |
3792 |
> |
} |
3793 |
> |
|
3794 |
> |
/** |
3795 |
> |
* Returns the result of accumulating the given transformation |
3796 |
> |
* of all (key, value) pairs using the given reducer to |
3797 |
> |
* combine values, and the given basis as an identity value. |
3798 |
> |
* |
3799 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3800 |
> |
* needed for this operation to be executed in parallel |
3801 |
> |
* @param transformer a function returning the transformation |
3802 |
> |
* for an element |
3803 |
> |
* @param basis the identity (initial default value) for the reduction |
3804 |
> |
* @param reducer a commutative associative combining function |
3805 |
> |
* @return the result of accumulating the given transformation |
3806 |
> |
* of all (key, value) pairs |
3807 |
> |
* @since 1.8 |
3808 |
> |
*/ |
3809 |
> |
public int reduceToInt(long parallelismThreshold, |
3810 |
> |
ToIntBiFunction<? super K, ? super V> transformer, |
3811 |
> |
int basis, |
3812 |
> |
IntBinaryOperator reducer) { |
3813 |
> |
if (transformer == null || reducer == null) |
3814 |
> |
throw new NullPointerException(); |
3815 |
> |
return new MapReduceMappingsToIntTask<K,V> |
3816 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3817 |
> |
null, transformer, basis, reducer).invoke(); |
3818 |
> |
} |
3819 |
> |
|
3820 |
> |
/** |
3821 |
> |
* Performs the given action for each key. |
3822 |
> |
* |
3823 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3824 |
> |
* needed for this operation to be executed in parallel |
3825 |
> |
* @param action the action |
3826 |
> |
* @since 1.8 |
3827 |
> |
*/ |
3828 |
> |
public void forEachKey(long parallelismThreshold, |
3829 |
> |
Consumer<? super K> action) { |
3830 |
> |
if (action == null) throw new NullPointerException(); |
3831 |
> |
new ForEachKeyTask<K,V> |
3832 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3833 |
> |
action).invoke(); |
3834 |
> |
} |
3835 |
> |
|
3836 |
> |
/** |
3837 |
> |
* Performs the given action for each non-null transformation |
3838 |
> |
* of each key. |
3839 |
> |
* |
3840 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3841 |
> |
* needed for this operation to be executed in parallel |
3842 |
> |
* @param transformer a function returning the transformation |
3843 |
> |
* for an element, or null if there is no transformation (in |
3844 |
> |
* which case the action is not applied) |
3845 |
> |
* @param action the action |
3846 |
> |
* @param <U> the return type of the transformer |
3847 |
> |
* @since 1.8 |
3848 |
> |
*/ |
3849 |
> |
public <U> void forEachKey(long parallelismThreshold, |
3850 |
> |
Function<? super K, ? extends U> transformer, |
3851 |
> |
Consumer<? super U> action) { |
3852 |
> |
if (transformer == null || action == null) |
3853 |
> |
throw new NullPointerException(); |
3854 |
> |
new ForEachTransformedKeyTask<K,V,U> |
3855 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3856 |
> |
transformer, action).invoke(); |
3857 |
> |
} |
3858 |
> |
|
3859 |
> |
/** |
3860 |
> |
* Returns a non-null result from applying the given search |
3861 |
> |
* function on each key, or null if none. Upon success, |
3862 |
> |
* further element processing is suppressed and the results of |
3863 |
> |
* any other parallel invocations of the search function are |
3864 |
> |
* ignored. |
3865 |
> |
* |
3866 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3867 |
> |
* needed for this operation to be executed in parallel |
3868 |
> |
* @param searchFunction a function returning a non-null |
3869 |
> |
* result on success, else null |
3870 |
> |
* @param <U> the return type of the search function |
3871 |
> |
* @return a non-null result from applying the given search |
3872 |
> |
* function on each key, or null if none |
3873 |
> |
* @since 1.8 |
3874 |
> |
*/ |
3875 |
> |
public <U> U searchKeys(long parallelismThreshold, |
3876 |
> |
Function<? super K, ? extends U> searchFunction) { |
3877 |
> |
if (searchFunction == null) throw new NullPointerException(); |
3878 |
> |
return new SearchKeysTask<K,V,U> |
3879 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3880 |
> |
searchFunction, new AtomicReference<U>()).invoke(); |
3881 |
> |
} |
3882 |
> |
|
3883 |
> |
/** |
3884 |
> |
* Returns the result of accumulating all keys using the given |
3885 |
> |
* reducer to combine values, or null if none. |
3886 |
> |
* |
3887 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3888 |
> |
* needed for this operation to be executed in parallel |
3889 |
> |
* @param reducer a commutative associative combining function |
3890 |
> |
* @return the result of accumulating all keys using the given |
3891 |
> |
* reducer to combine values, or null if none |
3892 |
> |
* @since 1.8 |
3893 |
> |
*/ |
3894 |
> |
public K reduceKeys(long parallelismThreshold, |
3895 |
> |
BiFunction<? super K, ? super K, ? extends K> reducer) { |
3896 |
> |
if (reducer == null) throw new NullPointerException(); |
3897 |
> |
return new ReduceKeysTask<K,V> |
3898 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3899 |
> |
null, reducer).invoke(); |
3900 |
> |
} |
3901 |
> |
|
3902 |
> |
/** |
3903 |
> |
* Returns the result of accumulating the given transformation |
3904 |
> |
* of all keys using the given reducer to combine values, or |
3905 |
> |
* null if none. |
3906 |
> |
* |
3907 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3908 |
> |
* needed for this operation to be executed in parallel |
3909 |
> |
* @param transformer a function returning the transformation |
3910 |
> |
* for an element, or null if there is no transformation (in |
3911 |
> |
* which case it is not combined) |
3912 |
> |
* @param reducer a commutative associative combining function |
3913 |
> |
* @param <U> the return type of the transformer |
3914 |
> |
* @return the result of accumulating the given transformation |
3915 |
> |
* of all keys |
3916 |
> |
* @since 1.8 |
3917 |
> |
*/ |
3918 |
> |
public <U> U reduceKeys(long parallelismThreshold, |
3919 |
> |
Function<? super K, ? extends U> transformer, |
3920 |
> |
BiFunction<? super U, ? super U, ? extends U> reducer) { |
3921 |
> |
if (transformer == null || reducer == null) |
3922 |
> |
throw new NullPointerException(); |
3923 |
> |
return new MapReduceKeysTask<K,V,U> |
3924 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3925 |
> |
null, transformer, reducer).invoke(); |
3926 |
> |
} |
3927 |
> |
|
3928 |
> |
/** |
3929 |
> |
* Returns the result of accumulating the given transformation |
3930 |
> |
* of all keys using the given reducer to combine values, and |
3931 |
> |
* the given basis as an identity value. |
3932 |
> |
* |
3933 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3934 |
> |
* needed for this operation to be executed in parallel |
3935 |
> |
* @param transformer a function returning the transformation |
3936 |
> |
* for an element |
3937 |
> |
* @param basis the identity (initial default value) for the reduction |
3938 |
> |
* @param reducer a commutative associative combining function |
3939 |
> |
* @return the result of accumulating the given transformation |
3940 |
> |
* of all keys |
3941 |
> |
* @since 1.8 |
3942 |
> |
*/ |
3943 |
> |
public double reduceKeysToDouble(long parallelismThreshold, |
3944 |
> |
ToDoubleFunction<? super K> transformer, |
3945 |
> |
double basis, |
3946 |
> |
DoubleBinaryOperator reducer) { |
3947 |
> |
if (transformer == null || reducer == null) |
3948 |
> |
throw new NullPointerException(); |
3949 |
> |
return new MapReduceKeysToDoubleTask<K,V> |
3950 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3951 |
> |
null, transformer, basis, reducer).invoke(); |
3952 |
> |
} |
3953 |
> |
|
3954 |
> |
/** |
3955 |
> |
* Returns the result of accumulating the given transformation |
3956 |
> |
* of all keys using the given reducer to combine values, and |
3957 |
> |
* the given basis as an identity value. |
3958 |
> |
* |
3959 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3960 |
> |
* needed for this operation to be executed in parallel |
3961 |
> |
* @param transformer a function returning the transformation |
3962 |
> |
* for an element |
3963 |
> |
* @param basis the identity (initial default value) for the reduction |
3964 |
> |
* @param reducer a commutative associative combining function |
3965 |
> |
* @return the result of accumulating the given transformation |
3966 |
> |
* of all keys |
3967 |
> |
* @since 1.8 |
3968 |
> |
*/ |
3969 |
> |
public long reduceKeysToLong(long parallelismThreshold, |
3970 |
> |
ToLongFunction<? super K> transformer, |
3971 |
> |
long basis, |
3972 |
> |
LongBinaryOperator reducer) { |
3973 |
> |
if (transformer == null || reducer == null) |
3974 |
> |
throw new NullPointerException(); |
3975 |
> |
return new MapReduceKeysToLongTask<K,V> |
3976 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
3977 |
> |
null, transformer, basis, reducer).invoke(); |
3978 |
> |
} |
3979 |
> |
|
3980 |
> |
/** |
3981 |
> |
* Returns the result of accumulating the given transformation |
3982 |
> |
* of all keys using the given reducer to combine values, and |
3983 |
> |
* the given basis as an identity value. |
3984 |
> |
* |
3985 |
> |
* @param parallelismThreshold the (estimated) number of elements |
3986 |
> |
* needed for this operation to be executed in parallel |
3987 |
> |
* @param transformer a function returning the transformation |
3988 |
> |
* for an element |
3989 |
> |
* @param basis the identity (initial default value) for the reduction |
3990 |
> |
* @param reducer a commutative associative combining function |
3991 |
> |
* @return the result of accumulating the given transformation |
3992 |
> |
* of all keys |
3993 |
> |
* @since 1.8 |
3994 |
> |
*/ |
3995 |
> |
public int reduceKeysToInt(long parallelismThreshold, |
3996 |
> |
ToIntFunction<? super K> transformer, |
3997 |
> |
int basis, |
3998 |
> |
IntBinaryOperator reducer) { |
3999 |
> |
if (transformer == null || reducer == null) |
4000 |
> |
throw new NullPointerException(); |
4001 |
> |
return new MapReduceKeysToIntTask<K,V> |
4002 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4003 |
> |
null, transformer, basis, reducer).invoke(); |
4004 |
> |
} |
4005 |
> |
|
4006 |
> |
/** |
4007 |
> |
* Performs the given action for each value. |
4008 |
> |
* |
4009 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4010 |
> |
* needed for this operation to be executed in parallel |
4011 |
> |
* @param action the action |
4012 |
> |
* @since 1.8 |
4013 |
> |
*/ |
4014 |
> |
public void forEachValue(long parallelismThreshold, |
4015 |
> |
Consumer<? super V> action) { |
4016 |
> |
if (action == null) |
4017 |
> |
throw new NullPointerException(); |
4018 |
> |
new ForEachValueTask<K,V> |
4019 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4020 |
> |
action).invoke(); |
4021 |
> |
} |
4022 |
> |
|
4023 |
> |
/** |
4024 |
> |
* Performs the given action for each non-null transformation |
4025 |
> |
* of each value. |
4026 |
> |
* |
4027 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4028 |
> |
* needed for this operation to be executed in parallel |
4029 |
> |
* @param transformer a function returning the transformation |
4030 |
> |
* for an element, or null if there is no transformation (in |
4031 |
> |
* which case the action is not applied) |
4032 |
> |
* @param action the action |
4033 |
> |
* @param <U> the return type of the transformer |
4034 |
> |
* @since 1.8 |
4035 |
> |
*/ |
4036 |
> |
public <U> void forEachValue(long parallelismThreshold, |
4037 |
> |
Function<? super V, ? extends U> transformer, |
4038 |
> |
Consumer<? super U> action) { |
4039 |
> |
if (transformer == null || action == null) |
4040 |
> |
throw new NullPointerException(); |
4041 |
> |
new ForEachTransformedValueTask<K,V,U> |
4042 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4043 |
> |
transformer, action).invoke(); |
4044 |
> |
} |
4045 |
> |
|
4046 |
> |
/** |
4047 |
> |
* Returns a non-null result from applying the given search |
4048 |
> |
* function on each value, or null if none. Upon success, |
4049 |
> |
* further element processing is suppressed and the results of |
4050 |
> |
* any other parallel invocations of the search function are |
4051 |
> |
* ignored. |
4052 |
> |
* |
4053 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4054 |
> |
* needed for this operation to be executed in parallel |
4055 |
> |
* @param searchFunction a function returning a non-null |
4056 |
> |
* result on success, else null |
4057 |
> |
* @param <U> the return type of the search function |
4058 |
> |
* @return a non-null result from applying the given search |
4059 |
> |
* function on each value, or null if none |
4060 |
> |
* @since 1.8 |
4061 |
> |
*/ |
4062 |
> |
public <U> U searchValues(long parallelismThreshold, |
4063 |
> |
Function<? super V, ? extends U> searchFunction) { |
4064 |
> |
if (searchFunction == null) throw new NullPointerException(); |
4065 |
> |
return new SearchValuesTask<K,V,U> |
4066 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4067 |
> |
searchFunction, new AtomicReference<U>()).invoke(); |
4068 |
> |
} |
4069 |
> |
|
4070 |
> |
/** |
4071 |
> |
* Returns the result of accumulating all values using the |
4072 |
> |
* given reducer to combine values, or null if none. |
4073 |
> |
* |
4074 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4075 |
> |
* needed for this operation to be executed in parallel |
4076 |
> |
* @param reducer a commutative associative combining function |
4077 |
> |
* @return the result of accumulating all values |
4078 |
> |
* @since 1.8 |
4079 |
> |
*/ |
4080 |
> |
public V reduceValues(long parallelismThreshold, |
4081 |
> |
BiFunction<? super V, ? super V, ? extends V> reducer) { |
4082 |
> |
if (reducer == null) throw new NullPointerException(); |
4083 |
> |
return new ReduceValuesTask<K,V> |
4084 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4085 |
> |
null, reducer).invoke(); |
4086 |
> |
} |
4087 |
> |
|
4088 |
> |
/** |
4089 |
> |
* Returns the result of accumulating the given transformation |
4090 |
> |
* of all values using the given reducer to combine values, or |
4091 |
> |
* null if none. |
4092 |
> |
* |
4093 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4094 |
> |
* needed for this operation to be executed in parallel |
4095 |
> |
* @param transformer a function returning the transformation |
4096 |
> |
* for an element, or null if there is no transformation (in |
4097 |
> |
* which case it is not combined) |
4098 |
> |
* @param reducer a commutative associative combining function |
4099 |
> |
* @param <U> the return type of the transformer |
4100 |
> |
* @return the result of accumulating the given transformation |
4101 |
> |
* of all values |
4102 |
> |
* @since 1.8 |
4103 |
> |
*/ |
4104 |
> |
public <U> U reduceValues(long parallelismThreshold, |
4105 |
> |
Function<? super V, ? extends U> transformer, |
4106 |
> |
BiFunction<? super U, ? super U, ? extends U> reducer) { |
4107 |
> |
if (transformer == null || reducer == null) |
4108 |
> |
throw new NullPointerException(); |
4109 |
> |
return new MapReduceValuesTask<K,V,U> |
4110 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4111 |
> |
null, transformer, reducer).invoke(); |
4112 |
> |
} |
4113 |
> |
|
4114 |
> |
/** |
4115 |
> |
* Returns the result of accumulating the given transformation |
4116 |
> |
* of all values using the given reducer to combine values, |
4117 |
> |
* and the given basis as an identity value. |
4118 |
> |
* |
4119 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4120 |
> |
* needed for this operation to be executed in parallel |
4121 |
> |
* @param transformer a function returning the transformation |
4122 |
> |
* for an element |
4123 |
> |
* @param basis the identity (initial default value) for the reduction |
4124 |
> |
* @param reducer a commutative associative combining function |
4125 |
> |
* @return the result of accumulating the given transformation |
4126 |
> |
* of all values |
4127 |
> |
* @since 1.8 |
4128 |
> |
*/ |
4129 |
> |
public double reduceValuesToDouble(long parallelismThreshold, |
4130 |
> |
ToDoubleFunction<? super V> transformer, |
4131 |
> |
double basis, |
4132 |
> |
DoubleBinaryOperator reducer) { |
4133 |
> |
if (transformer == null || reducer == null) |
4134 |
> |
throw new NullPointerException(); |
4135 |
> |
return new MapReduceValuesToDoubleTask<K,V> |
4136 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4137 |
> |
null, transformer, basis, reducer).invoke(); |
4138 |
> |
} |
4139 |
> |
|
4140 |
> |
/** |
4141 |
> |
* Returns the result of accumulating the given transformation |
4142 |
> |
* of all values using the given reducer to combine values, |
4143 |
> |
* and the given basis as an identity value. |
4144 |
> |
* |
4145 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4146 |
> |
* needed for this operation to be executed in parallel |
4147 |
> |
* @param transformer a function returning the transformation |
4148 |
> |
* for an element |
4149 |
> |
* @param basis the identity (initial default value) for the reduction |
4150 |
> |
* @param reducer a commutative associative combining function |
4151 |
> |
* @return the result of accumulating the given transformation |
4152 |
> |
* of all values |
4153 |
> |
* @since 1.8 |
4154 |
> |
*/ |
4155 |
> |
public long reduceValuesToLong(long parallelismThreshold, |
4156 |
> |
ToLongFunction<? super V> transformer, |
4157 |
> |
long basis, |
4158 |
> |
LongBinaryOperator reducer) { |
4159 |
> |
if (transformer == null || reducer == null) |
4160 |
> |
throw new NullPointerException(); |
4161 |
> |
return new MapReduceValuesToLongTask<K,V> |
4162 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4163 |
> |
null, transformer, basis, reducer).invoke(); |
4164 |
> |
} |
4165 |
> |
|
4166 |
> |
/** |
4167 |
> |
* Returns the result of accumulating the given transformation |
4168 |
> |
* of all values using the given reducer to combine values, |
4169 |
> |
* and the given basis as an identity value. |
4170 |
> |
* |
4171 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4172 |
> |
* needed for this operation to be executed in parallel |
4173 |
> |
* @param transformer a function returning the transformation |
4174 |
> |
* for an element |
4175 |
> |
* @param basis the identity (initial default value) for the reduction |
4176 |
> |
* @param reducer a commutative associative combining function |
4177 |
> |
* @return the result of accumulating the given transformation |
4178 |
> |
* of all values |
4179 |
> |
* @since 1.8 |
4180 |
> |
*/ |
4181 |
> |
public int reduceValuesToInt(long parallelismThreshold, |
4182 |
> |
ToIntFunction<? super V> transformer, |
4183 |
> |
int basis, |
4184 |
> |
IntBinaryOperator reducer) { |
4185 |
> |
if (transformer == null || reducer == null) |
4186 |
> |
throw new NullPointerException(); |
4187 |
> |
return new MapReduceValuesToIntTask<K,V> |
4188 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4189 |
> |
null, transformer, basis, reducer).invoke(); |
4190 |
> |
} |
4191 |
> |
|
4192 |
> |
/** |
4193 |
> |
* Performs the given action for each entry. |
4194 |
> |
* |
4195 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4196 |
> |
* needed for this operation to be executed in parallel |
4197 |
> |
* @param action the action |
4198 |
> |
* @since 1.8 |
4199 |
> |
*/ |
4200 |
> |
public void forEachEntry(long parallelismThreshold, |
4201 |
> |
Consumer<? super Map.Entry<K,V>> action) { |
4202 |
> |
if (action == null) throw new NullPointerException(); |
4203 |
> |
new ForEachEntryTask<K,V>(null, batchFor(parallelismThreshold), 0, 0, table, |
4204 |
> |
action).invoke(); |
4205 |
> |
} |
4206 |
> |
|
4207 |
> |
/** |
4208 |
> |
* Performs the given action for each non-null transformation |
4209 |
> |
* of each entry. |
4210 |
> |
* |
4211 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4212 |
> |
* needed for this operation to be executed in parallel |
4213 |
> |
* @param transformer a function returning the transformation |
4214 |
> |
* for an element, or null if there is no transformation (in |
4215 |
> |
* which case the action is not applied) |
4216 |
> |
* @param action the action |
4217 |
> |
* @param <U> the return type of the transformer |
4218 |
> |
* @since 1.8 |
4219 |
> |
*/ |
4220 |
> |
public <U> void forEachEntry(long parallelismThreshold, |
4221 |
> |
Function<Map.Entry<K,V>, ? extends U> transformer, |
4222 |
> |
Consumer<? super U> action) { |
4223 |
> |
if (transformer == null || action == null) |
4224 |
> |
throw new NullPointerException(); |
4225 |
> |
new ForEachTransformedEntryTask<K,V,U> |
4226 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4227 |
> |
transformer, action).invoke(); |
4228 |
> |
} |
4229 |
> |
|
4230 |
> |
/** |
4231 |
> |
* Returns a non-null result from applying the given search |
4232 |
> |
* function on each entry, or null if none. Upon success, |
4233 |
> |
* further element processing is suppressed and the results of |
4234 |
> |
* any other parallel invocations of the search function are |
4235 |
> |
* ignored. |
4236 |
> |
* |
4237 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4238 |
> |
* needed for this operation to be executed in parallel |
4239 |
> |
* @param searchFunction a function returning a non-null |
4240 |
> |
* result on success, else null |
4241 |
> |
* @param <U> the return type of the search function |
4242 |
> |
* @return a non-null result from applying the given search |
4243 |
> |
* function on each entry, or null if none |
4244 |
> |
* @since 1.8 |
4245 |
> |
*/ |
4246 |
> |
public <U> U searchEntries(long parallelismThreshold, |
4247 |
> |
Function<Map.Entry<K,V>, ? extends U> searchFunction) { |
4248 |
> |
if (searchFunction == null) throw new NullPointerException(); |
4249 |
> |
return new SearchEntriesTask<K,V,U> |
4250 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4251 |
> |
searchFunction, new AtomicReference<U>()).invoke(); |
4252 |
> |
} |
4253 |
> |
|
4254 |
> |
/** |
4255 |
> |
* Returns the result of accumulating all entries using the |
4256 |
> |
* given reducer to combine values, or null if none. |
4257 |
> |
* |
4258 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4259 |
> |
* needed for this operation to be executed in parallel |
4260 |
> |
* @param reducer a commutative associative combining function |
4261 |
> |
* @return the result of accumulating all entries |
4262 |
> |
* @since 1.8 |
4263 |
> |
*/ |
4264 |
> |
public Map.Entry<K,V> reduceEntries(long parallelismThreshold, |
4265 |
> |
BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) { |
4266 |
> |
if (reducer == null) throw new NullPointerException(); |
4267 |
> |
return new ReduceEntriesTask<K,V> |
4268 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4269 |
> |
null, reducer).invoke(); |
4270 |
> |
} |
4271 |
> |
|
4272 |
> |
/** |
4273 |
> |
* Returns the result of accumulating the given transformation |
4274 |
> |
* of all entries using the given reducer to combine values, |
4275 |
> |
* or null if none. |
4276 |
> |
* |
4277 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4278 |
> |
* needed for this operation to be executed in parallel |
4279 |
> |
* @param transformer a function returning the transformation |
4280 |
> |
* for an element, or null if there is no transformation (in |
4281 |
> |
* which case it is not combined) |
4282 |
> |
* @param reducer a commutative associative combining function |
4283 |
> |
* @param <U> the return type of the transformer |
4284 |
> |
* @return the result of accumulating the given transformation |
4285 |
> |
* of all entries |
4286 |
> |
* @since 1.8 |
4287 |
> |
*/ |
4288 |
> |
public <U> U reduceEntries(long parallelismThreshold, |
4289 |
> |
Function<Map.Entry<K,V>, ? extends U> transformer, |
4290 |
> |
BiFunction<? super U, ? super U, ? extends U> reducer) { |
4291 |
> |
if (transformer == null || reducer == null) |
4292 |
> |
throw new NullPointerException(); |
4293 |
> |
return new MapReduceEntriesTask<K,V,U> |
4294 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4295 |
> |
null, transformer, reducer).invoke(); |
4296 |
> |
} |
4297 |
> |
|
4298 |
> |
/** |
4299 |
> |
* Returns the result of accumulating the given transformation |
4300 |
> |
* of all entries using the given reducer to combine values, |
4301 |
> |
* and the given basis as an identity value. |
4302 |
> |
* |
4303 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4304 |
> |
* needed for this operation to be executed in parallel |
4305 |
> |
* @param transformer a function returning the transformation |
4306 |
> |
* for an element |
4307 |
> |
* @param basis the identity (initial default value) for the reduction |
4308 |
> |
* @param reducer a commutative associative combining function |
4309 |
> |
* @return the result of accumulating the given transformation |
4310 |
> |
* of all entries |
4311 |
> |
* @since 1.8 |
4312 |
> |
*/ |
4313 |
> |
public double reduceEntriesToDouble(long parallelismThreshold, |
4314 |
> |
ToDoubleFunction<Map.Entry<K,V>> transformer, |
4315 |
> |
double basis, |
4316 |
> |
DoubleBinaryOperator reducer) { |
4317 |
> |
if (transformer == null || reducer == null) |
4318 |
> |
throw new NullPointerException(); |
4319 |
> |
return new MapReduceEntriesToDoubleTask<K,V> |
4320 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4321 |
> |
null, transformer, basis, reducer).invoke(); |
4322 |
> |
} |
4323 |
> |
|
4324 |
> |
/** |
4325 |
> |
* Returns the result of accumulating the given transformation |
4326 |
> |
* of all entries using the given reducer to combine values, |
4327 |
> |
* and the given basis as an identity value. |
4328 |
> |
* |
4329 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4330 |
> |
* needed for this operation to be executed in parallel |
4331 |
> |
* @param transformer a function returning the transformation |
4332 |
> |
* for an element |
4333 |
> |
* @param basis the identity (initial default value) for the reduction |
4334 |
> |
* @param reducer a commutative associative combining function |
4335 |
> |
* @return the result of accumulating the given transformation |
4336 |
> |
* of all entries |
4337 |
> |
* @since 1.8 |
4338 |
> |
*/ |
4339 |
> |
public long reduceEntriesToLong(long parallelismThreshold, |
4340 |
> |
ToLongFunction<Map.Entry<K,V>> transformer, |
4341 |
> |
long basis, |
4342 |
> |
LongBinaryOperator reducer) { |
4343 |
> |
if (transformer == null || reducer == null) |
4344 |
> |
throw new NullPointerException(); |
4345 |
> |
return new MapReduceEntriesToLongTask<K,V> |
4346 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4347 |
> |
null, transformer, basis, reducer).invoke(); |
4348 |
> |
} |
4349 |
> |
|
4350 |
> |
/** |
4351 |
> |
* Returns the result of accumulating the given transformation |
4352 |
> |
* of all entries using the given reducer to combine values, |
4353 |
> |
* and the given basis as an identity value. |
4354 |
> |
* |
4355 |
> |
* @param parallelismThreshold the (estimated) number of elements |
4356 |
> |
* needed for this operation to be executed in parallel |
4357 |
> |
* @param transformer a function returning the transformation |
4358 |
> |
* for an element |
4359 |
> |
* @param basis the identity (initial default value) for the reduction |
4360 |
> |
* @param reducer a commutative associative combining function |
4361 |
> |
* @return the result of accumulating the given transformation |
4362 |
> |
* of all entries |
4363 |
> |
* @since 1.8 |
4364 |
> |
*/ |
4365 |
> |
public int reduceEntriesToInt(long parallelismThreshold, |
4366 |
> |
ToIntFunction<Map.Entry<K,V>> transformer, |
4367 |
> |
int basis, |
4368 |
> |
IntBinaryOperator reducer) { |
4369 |
> |
if (transformer == null || reducer == null) |
4370 |
> |
throw new NullPointerException(); |
4371 |
> |
return new MapReduceEntriesToIntTask<K,V> |
4372 |
> |
(null, batchFor(parallelismThreshold), 0, 0, table, |
4373 |
> |
null, transformer, basis, reducer).invoke(); |
4374 |
> |
} |
4375 |
> |
|
4376 |
> |
|
4377 |
> |
/* ----------------Views -------------- */ |
4378 |
> |
|
4379 |
> |
/** |
4380 |
> |
* Base class for views. |
4381 |
> |
*/ |
4382 |
> |
abstract static class CollectionView<K,V,E> |
4383 |
> |
implements Collection<E>, java.io.Serializable { |
4384 |
> |
private static final long serialVersionUID = 7249069246763182397L; |
4385 |
> |
final ConcurrentHashMap<K,V> map; |
4386 |
> |
CollectionView(ConcurrentHashMap<K,V> map) { this.map = map; } |
4387 |
> |
|
4388 |
> |
/** |
4389 |
> |
* Returns the map backing this view. |
4390 |
> |
* |
4391 |
> |
* @return the map backing this view |
4392 |
> |
*/ |
4393 |
> |
public ConcurrentHashMap<K,V> getMap() { return map; } |
4394 |
> |
|
4395 |
> |
/** |
4396 |
> |
* Removes all of the elements from this view, by removing all |
4397 |
> |
* the mappings from the map backing this view. |
4398 |
> |
*/ |
4399 |
> |
public final void clear() { map.clear(); } |
4400 |
> |
public final int size() { return map.size(); } |
4401 |
> |
public final boolean isEmpty() { return map.isEmpty(); } |
4402 |
> |
|
4403 |
> |
// implementations below rely on concrete classes supplying these |
4404 |
> |
// abstract methods |
4405 |
> |
/** |
4406 |
> |
* Returns an iterator over the elements in this collection. |
4407 |
> |
* |
4408 |
> |
* <p>The returned iterator is |
4409 |
> |
* <a href="package-summary.html#Weakly"><i>weakly consistent</i></a>. |
4410 |
> |
* |
4411 |
> |
* @return an iterator over the elements in this collection |
4412 |
> |
*/ |
4413 |
> |
public abstract Iterator<E> iterator(); |
4414 |
> |
public abstract boolean contains(Object o); |
4415 |
> |
public abstract boolean remove(Object o); |
4416 |
> |
|
4417 |
> |
private static final String OOME_MSG = "Required array size too large"; |
4418 |
> |
|
4419 |
> |
public final Object[] toArray() { |
4420 |
> |
long sz = map.mappingCount(); |
4421 |
> |
if (sz > MAX_ARRAY_SIZE) |
4422 |
> |
throw new OutOfMemoryError(OOME_MSG); |
4423 |
> |
int n = (int)sz; |
4424 |
> |
Object[] r = new Object[n]; |
4425 |
> |
int i = 0; |
4426 |
> |
for (E e : this) { |
4427 |
> |
if (i == n) { |
4428 |
> |
if (n >= MAX_ARRAY_SIZE) |
4429 |
> |
throw new OutOfMemoryError(OOME_MSG); |
4430 |
> |
if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1) |
4431 |
> |
n = MAX_ARRAY_SIZE; |
4432 |
> |
else |
4433 |
> |
n += (n >>> 1) + 1; |
4434 |
> |
r = Arrays.copyOf(r, n); |
4435 |
> |
} |
4436 |
> |
r[i++] = e; |
4437 |
> |
} |
4438 |
> |
return (i == n) ? r : Arrays.copyOf(r, i); |
4439 |
> |
} |
4440 |
> |
|
4441 |
> |
@SuppressWarnings("unchecked") |
4442 |
> |
public final <T> T[] toArray(T[] a) { |
4443 |
> |
long sz = map.mappingCount(); |
4444 |
> |
if (sz > MAX_ARRAY_SIZE) |
4445 |
> |
throw new OutOfMemoryError(OOME_MSG); |
4446 |
> |
int m = (int)sz; |
4447 |
> |
T[] r = (a.length >= m) ? a : |
4448 |
> |
(T[])java.lang.reflect.Array |
4449 |
> |
.newInstance(a.getClass().getComponentType(), m); |
4450 |
> |
int n = r.length; |
4451 |
> |
int i = 0; |
4452 |
> |
for (E e : this) { |
4453 |
> |
if (i == n) { |
4454 |
> |
if (n >= MAX_ARRAY_SIZE) |
4455 |
> |
throw new OutOfMemoryError(OOME_MSG); |
4456 |
> |
if (n >= MAX_ARRAY_SIZE - (MAX_ARRAY_SIZE >>> 1) - 1) |
4457 |
> |
n = MAX_ARRAY_SIZE; |
4458 |
> |
else |
4459 |
> |
n += (n >>> 1) + 1; |
4460 |
> |
r = Arrays.copyOf(r, n); |
4461 |
> |
} |
4462 |
> |
r[i++] = (T)e; |
4463 |
> |
} |
4464 |
> |
if (a == r && i < n) { |
4465 |
> |
r[i] = null; // null-terminate |
4466 |
> |
return r; |
4467 |
> |
} |
4468 |
> |
return (i == n) ? r : Arrays.copyOf(r, i); |
4469 |
|
} |
4470 |
< |
public Object[] toArray() { |
4471 |
< |
Collection<K> c = new ArrayList<K>(size()); |
4472 |
< |
for (K k : this) |
4473 |
< |
c.add(k); |
4474 |
< |
return c.toArray(); |
4470 |
> |
|
4471 |
> |
/** |
4472 |
> |
* Returns a string representation of this collection. |
4473 |
> |
* The string representation consists of the string representations |
4474 |
> |
* of the collection's elements in the order they are returned by |
4475 |
> |
* its iterator, enclosed in square brackets ({@code "[]"}). |
4476 |
> |
* Adjacent elements are separated by the characters {@code ", "} |
4477 |
> |
* (comma and space). Elements are converted to strings as by |
4478 |
> |
* {@link String#valueOf(Object)}. |
4479 |
> |
* |
4480 |
> |
* @return a string representation of this collection |
4481 |
> |
*/ |
4482 |
> |
public final String toString() { |
4483 |
> |
StringBuilder sb = new StringBuilder(); |
4484 |
> |
sb.append('['); |
4485 |
> |
Iterator<E> it = iterator(); |
4486 |
> |
if (it.hasNext()) { |
4487 |
> |
for (;;) { |
4488 |
> |
Object e = it.next(); |
4489 |
> |
sb.append(e == this ? "(this Collection)" : e); |
4490 |
> |
if (!it.hasNext()) |
4491 |
> |
break; |
4492 |
> |
sb.append(',').append(' '); |
4493 |
> |
} |
4494 |
> |
} |
4495 |
> |
return sb.append(']').toString(); |
4496 |
|
} |
4497 |
< |
public <T> T[] toArray(T[] a) { |
4498 |
< |
Collection<K> c = new ArrayList<K>(); |
4499 |
< |
for (K k : this) |
4500 |
< |
c.add(k); |
4501 |
< |
return c.toArray(a); |
4497 |
> |
|
4498 |
> |
public final boolean containsAll(Collection<?> c) { |
4499 |
> |
if (c != this) { |
4500 |
> |
for (Object e : c) { |
4501 |
> |
if (e == null || !contains(e)) |
4502 |
> |
return false; |
4503 |
> |
} |
4504 |
> |
} |
4505 |
> |
return true; |
4506 |
|
} |
1191 |
– |
} |
4507 |
|
|
4508 |
< |
final class Values extends AbstractCollection<V> { |
4509 |
< |
public Iterator<V> iterator() { |
4510 |
< |
return new ValueIterator(); |
4508 |
> |
public boolean removeAll(Collection<?> c) { |
4509 |
> |
if (c == null) throw new NullPointerException(); |
4510 |
> |
boolean modified = false; |
4511 |
> |
// Use (c instanceof Set) as a hint that lookup in c is as |
4512 |
> |
// efficient as this view |
4513 |
> |
Node<K,V>[] t; |
4514 |
> |
if ((t = map.table) == null) { |
4515 |
> |
return false; |
4516 |
> |
} else if (c instanceof Set<?> && c.size() > t.length) { |
4517 |
> |
for (Iterator<?> it = iterator(); it.hasNext(); ) { |
4518 |
> |
if (c.contains(it.next())) { |
4519 |
> |
it.remove(); |
4520 |
> |
modified = true; |
4521 |
> |
} |
4522 |
> |
} |
4523 |
> |
} else { |
4524 |
> |
for (Object e : c) |
4525 |
> |
modified |= remove(e); |
4526 |
> |
} |
4527 |
> |
return modified; |
4528 |
|
} |
4529 |
< |
public int size() { |
4530 |
< |
return ConcurrentHashMap.this.size(); |
4529 |
> |
|
4530 |
> |
public final boolean retainAll(Collection<?> c) { |
4531 |
> |
if (c == null) throw new NullPointerException(); |
4532 |
> |
boolean modified = false; |
4533 |
> |
for (Iterator<E> it = iterator(); it.hasNext();) { |
4534 |
> |
if (!c.contains(it.next())) { |
4535 |
> |
it.remove(); |
4536 |
> |
modified = true; |
4537 |
> |
} |
4538 |
> |
} |
4539 |
> |
return modified; |
4540 |
|
} |
4541 |
< |
public boolean contains(Object o) { |
4542 |
< |
return ConcurrentHashMap.this.containsValue(o); |
4541 |
> |
|
4542 |
> |
} |
4543 |
> |
|
4544 |
> |
/** |
4545 |
> |
* A view of a ConcurrentHashMap as a {@link Set} of keys, in |
4546 |
> |
* which additions may optionally be enabled by mapping to a |
4547 |
> |
* common value. This class cannot be directly instantiated. |
4548 |
> |
* See {@link #keySet() keySet()}, |
4549 |
> |
* {@link #keySet(Object) keySet(V)}, |
4550 |
> |
* {@link #newKeySet() newKeySet()}, |
4551 |
> |
* {@link #newKeySet(int) newKeySet(int)}. |
4552 |
> |
* |
4553 |
> |
* @since 1.8 |
4554 |
> |
*/ |
4555 |
> |
public static class KeySetView<K,V> extends CollectionView<K,V,K> |
4556 |
> |
implements Set<K>, java.io.Serializable { |
4557 |
> |
private static final long serialVersionUID = 7249069246763182397L; |
4558 |
> |
private final V value; |
4559 |
> |
KeySetView(ConcurrentHashMap<K,V> map, V value) { // non-public |
4560 |
> |
super(map); |
4561 |
> |
this.value = value; |
4562 |
|
} |
4563 |
< |
public void clear() { |
4564 |
< |
ConcurrentHashMap.this.clear(); |
4563 |
> |
|
4564 |
> |
/** |
4565 |
> |
* Returns the default mapped value for additions, |
4566 |
> |
* or {@code null} if additions are not supported. |
4567 |
> |
* |
4568 |
> |
* @return the default mapped value for additions, or {@code null} |
4569 |
> |
* if not supported |
4570 |
> |
*/ |
4571 |
> |
public V getMappedValue() { return value; } |
4572 |
> |
|
4573 |
> |
/** |
4574 |
> |
* {@inheritDoc} |
4575 |
> |
* @throws NullPointerException if the specified key is null |
4576 |
> |
*/ |
4577 |
> |
public boolean contains(Object o) { return map.containsKey(o); } |
4578 |
> |
|
4579 |
> |
/** |
4580 |
> |
* Removes the key from this map view, by removing the key (and its |
4581 |
> |
* corresponding value) from the backing map. This method does |
4582 |
> |
* nothing if the key is not in the map. |
4583 |
> |
* |
4584 |
> |
* @param o the key to be removed from the backing map |
4585 |
> |
* @return {@code true} if the backing map contained the specified key |
4586 |
> |
* @throws NullPointerException if the specified key is null |
4587 |
> |
*/ |
4588 |
> |
public boolean remove(Object o) { return map.remove(o) != null; } |
4589 |
> |
|
4590 |
> |
/** |
4591 |
> |
* @return an iterator over the keys of the backing map |
4592 |
> |
*/ |
4593 |
> |
public Iterator<K> iterator() { |
4594 |
> |
Node<K,V>[] t; |
4595 |
> |
ConcurrentHashMap<K,V> m = map; |
4596 |
> |
int f = (t = m.table) == null ? 0 : t.length; |
4597 |
> |
return new KeyIterator<K,V>(t, f, 0, f, m); |
4598 |
> |
} |
4599 |
> |
|
4600 |
> |
/** |
4601 |
> |
* Adds the specified key to this set view by mapping the key to |
4602 |
> |
* the default mapped value in the backing map, if defined. |
4603 |
> |
* |
4604 |
> |
* @param e key to be added |
4605 |
> |
* @return {@code true} if this set changed as a result of the call |
4606 |
> |
* @throws NullPointerException if the specified key is null |
4607 |
> |
* @throws UnsupportedOperationException if no default mapped value |
4608 |
> |
* for additions was provided |
4609 |
> |
*/ |
4610 |
> |
public boolean add(K e) { |
4611 |
> |
V v; |
4612 |
> |
if ((v = value) == null) |
4613 |
> |
throw new UnsupportedOperationException(); |
4614 |
> |
return map.putVal(e, v, true) == null; |
4615 |
|
} |
4616 |
< |
public Object[] toArray() { |
4617 |
< |
Collection<V> c = new ArrayList<V>(size()); |
4618 |
< |
for (V v : this) |
4619 |
< |
c.add(v); |
4620 |
< |
return c.toArray(); |
4616 |
> |
|
4617 |
> |
/** |
4618 |
> |
* Adds all of the elements in the specified collection to this set, |
4619 |
> |
* as if by calling {@link #add} on each one. |
4620 |
> |
* |
4621 |
> |
* @param c the elements to be inserted into this set |
4622 |
> |
* @return {@code true} if this set changed as a result of the call |
4623 |
> |
* @throws NullPointerException if the collection or any of its |
4624 |
> |
* elements are {@code null} |
4625 |
> |
* @throws UnsupportedOperationException if no default mapped value |
4626 |
> |
* for additions was provided |
4627 |
> |
*/ |
4628 |
> |
public boolean addAll(Collection<? extends K> c) { |
4629 |
> |
boolean added = false; |
4630 |
> |
V v; |
4631 |
> |
if ((v = value) == null) |
4632 |
> |
throw new UnsupportedOperationException(); |
4633 |
> |
for (K e : c) { |
4634 |
> |
if (map.putVal(e, v, true) == null) |
4635 |
> |
added = true; |
4636 |
> |
} |
4637 |
> |
return added; |
4638 |
|
} |
4639 |
< |
public <T> T[] toArray(T[] a) { |
4640 |
< |
Collection<V> c = new ArrayList<V>(size()); |
4641 |
< |
for (V v : this) |
4642 |
< |
c.add(v); |
4643 |
< |
return c.toArray(a); |
4639 |
> |
|
4640 |
> |
public int hashCode() { |
4641 |
> |
int h = 0; |
4642 |
> |
for (K e : this) |
4643 |
> |
h += e.hashCode(); |
4644 |
> |
return h; |
4645 |
> |
} |
4646 |
> |
|
4647 |
> |
public boolean equals(Object o) { |
4648 |
> |
Set<?> c; |
4649 |
> |
return ((o instanceof Set) && |
4650 |
> |
((c = (Set<?>)o) == this || |
4651 |
> |
(containsAll(c) && c.containsAll(this)))); |
4652 |
> |
} |
4653 |
> |
|
4654 |
> |
public Spliterator<K> spliterator() { |
4655 |
> |
Node<K,V>[] t; |
4656 |
> |
ConcurrentHashMap<K,V> m = map; |
4657 |
> |
long n = m.sumCount(); |
4658 |
> |
int f = (t = m.table) == null ? 0 : t.length; |
4659 |
> |
return new KeySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n); |
4660 |
> |
} |
4661 |
> |
|
4662 |
> |
public void forEach(Consumer<? super K> action) { |
4663 |
> |
if (action == null) throw new NullPointerException(); |
4664 |
> |
Node<K,V>[] t; |
4665 |
> |
if ((t = map.table) != null) { |
4666 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
4667 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) |
4668 |
> |
action.accept(p.key); |
4669 |
> |
} |
4670 |
|
} |
4671 |
|
} |
4672 |
|
|
4673 |
< |
final class EntrySet extends AbstractSet<Map.Entry<K,V>> { |
4674 |
< |
public Iterator<Map.Entry<K,V>> iterator() { |
4675 |
< |
return new EntryIterator(); |
4673 |
> |
/** |
4674 |
> |
* A view of a ConcurrentHashMap as a {@link Collection} of |
4675 |
> |
* values, in which additions are disabled. This class cannot be |
4676 |
> |
* directly instantiated. See {@link #values()}. |
4677 |
> |
*/ |
4678 |
> |
static final class ValuesView<K,V> extends CollectionView<K,V,V> |
4679 |
> |
implements Collection<V>, java.io.Serializable { |
4680 |
> |
private static final long serialVersionUID = 2249069246763182397L; |
4681 |
> |
ValuesView(ConcurrentHashMap<K,V> map) { super(map); } |
4682 |
> |
public final boolean contains(Object o) { |
4683 |
> |
return map.containsValue(o); |
4684 |
|
} |
4685 |
+ |
|
4686 |
+ |
public final boolean remove(Object o) { |
4687 |
+ |
if (o != null) { |
4688 |
+ |
for (Iterator<V> it = iterator(); it.hasNext();) { |
4689 |
+ |
if (o.equals(it.next())) { |
4690 |
+ |
it.remove(); |
4691 |
+ |
return true; |
4692 |
+ |
} |
4693 |
+ |
} |
4694 |
+ |
} |
4695 |
+ |
return false; |
4696 |
+ |
} |
4697 |
+ |
|
4698 |
+ |
public final Iterator<V> iterator() { |
4699 |
+ |
ConcurrentHashMap<K,V> m = map; |
4700 |
+ |
Node<K,V>[] t; |
4701 |
+ |
int f = (t = m.table) == null ? 0 : t.length; |
4702 |
+ |
return new ValueIterator<K,V>(t, f, 0, f, m); |
4703 |
+ |
} |
4704 |
+ |
|
4705 |
+ |
public final boolean add(V e) { |
4706 |
+ |
throw new UnsupportedOperationException(); |
4707 |
+ |
} |
4708 |
+ |
public final boolean addAll(Collection<? extends V> c) { |
4709 |
+ |
throw new UnsupportedOperationException(); |
4710 |
+ |
} |
4711 |
+ |
|
4712 |
+ |
@Override public boolean removeAll(Collection<?> c) { |
4713 |
+ |
if (c == null) throw new NullPointerException(); |
4714 |
+ |
boolean modified = false; |
4715 |
+ |
for (Iterator<V> it = iterator(); it.hasNext();) { |
4716 |
+ |
if (c.contains(it.next())) { |
4717 |
+ |
it.remove(); |
4718 |
+ |
modified = true; |
4719 |
+ |
} |
4720 |
+ |
} |
4721 |
+ |
return modified; |
4722 |
+ |
} |
4723 |
+ |
|
4724 |
+ |
public boolean removeIf(Predicate<? super V> filter) { |
4725 |
+ |
return map.removeValueIf(filter); |
4726 |
+ |
} |
4727 |
+ |
|
4728 |
+ |
public Spliterator<V> spliterator() { |
4729 |
+ |
Node<K,V>[] t; |
4730 |
+ |
ConcurrentHashMap<K,V> m = map; |
4731 |
+ |
long n = m.sumCount(); |
4732 |
+ |
int f = (t = m.table) == null ? 0 : t.length; |
4733 |
+ |
return new ValueSpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n); |
4734 |
+ |
} |
4735 |
+ |
|
4736 |
+ |
public void forEach(Consumer<? super V> action) { |
4737 |
+ |
if (action == null) throw new NullPointerException(); |
4738 |
+ |
Node<K,V>[] t; |
4739 |
+ |
if ((t = map.table) != null) { |
4740 |
+ |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
4741 |
+ |
for (Node<K,V> p; (p = it.advance()) != null; ) |
4742 |
+ |
action.accept(p.val); |
4743 |
+ |
} |
4744 |
+ |
} |
4745 |
+ |
} |
4746 |
+ |
|
4747 |
+ |
/** |
4748 |
+ |
* A view of a ConcurrentHashMap as a {@link Set} of (key, value) |
4749 |
+ |
* entries. This class cannot be directly instantiated. See |
4750 |
+ |
* {@link #entrySet()}. |
4751 |
+ |
*/ |
4752 |
+ |
static final class EntrySetView<K,V> extends CollectionView<K,V,Map.Entry<K,V>> |
4753 |
+ |
implements Set<Map.Entry<K,V>>, java.io.Serializable { |
4754 |
+ |
private static final long serialVersionUID = 2249069246763182397L; |
4755 |
+ |
EntrySetView(ConcurrentHashMap<K,V> map) { super(map); } |
4756 |
+ |
|
4757 |
|
public boolean contains(Object o) { |
4758 |
< |
if (!(o instanceof Map.Entry)) |
4759 |
< |
return false; |
4760 |
< |
Map.Entry<?,?> e = (Map.Entry<?,?>)o; |
4761 |
< |
V v = ConcurrentHashMap.this.get(e.getKey()); |
4762 |
< |
return v != null && v.equals(e.getValue()); |
4758 |
> |
Object k, v, r; Map.Entry<?,?> e; |
4759 |
> |
return ((o instanceof Map.Entry) && |
4760 |
> |
(k = (e = (Map.Entry<?,?>)o).getKey()) != null && |
4761 |
> |
(r = map.get(k)) != null && |
4762 |
> |
(v = e.getValue()) != null && |
4763 |
> |
(v == r || v.equals(r))); |
4764 |
|
} |
4765 |
+ |
|
4766 |
|
public boolean remove(Object o) { |
4767 |
< |
if (!(o instanceof Map.Entry)) |
4768 |
< |
return false; |
4769 |
< |
Map.Entry<?,?> e = (Map.Entry<?,?>)o; |
4770 |
< |
return ConcurrentHashMap.this.remove(e.getKey(), e.getValue()); |
4767 |
> |
Object k, v; Map.Entry<?,?> e; |
4768 |
> |
return ((o instanceof Map.Entry) && |
4769 |
> |
(k = (e = (Map.Entry<?,?>)o).getKey()) != null && |
4770 |
> |
(v = e.getValue()) != null && |
4771 |
> |
map.remove(k, v)); |
4772 |
> |
} |
4773 |
> |
|
4774 |
> |
/** |
4775 |
> |
* @return an iterator over the entries of the backing map |
4776 |
> |
*/ |
4777 |
> |
public Iterator<Map.Entry<K,V>> iterator() { |
4778 |
> |
ConcurrentHashMap<K,V> m = map; |
4779 |
> |
Node<K,V>[] t; |
4780 |
> |
int f = (t = m.table) == null ? 0 : t.length; |
4781 |
> |
return new EntryIterator<K,V>(t, f, 0, f, m); |
4782 |
> |
} |
4783 |
> |
|
4784 |
> |
public boolean add(Entry<K,V> e) { |
4785 |
> |
return map.putVal(e.getKey(), e.getValue(), false) == null; |
4786 |
|
} |
4787 |
< |
public int size() { |
4788 |
< |
return ConcurrentHashMap.this.size(); |
4787 |
> |
|
4788 |
> |
public boolean addAll(Collection<? extends Entry<K,V>> c) { |
4789 |
> |
boolean added = false; |
4790 |
> |
for (Entry<K,V> e : c) { |
4791 |
> |
if (add(e)) |
4792 |
> |
added = true; |
4793 |
> |
} |
4794 |
> |
return added; |
4795 |
|
} |
4796 |
< |
public void clear() { |
4797 |
< |
ConcurrentHashMap.this.clear(); |
4796 |
> |
|
4797 |
> |
public boolean removeIf(Predicate<? super Entry<K,V>> filter) { |
4798 |
> |
return map.removeEntryIf(filter); |
4799 |
|
} |
4800 |
< |
public Object[] toArray() { |
4801 |
< |
Collection<Map.Entry<K,V>> c = new ArrayList<Map.Entry<K,V>>(size()); |
4802 |
< |
for (Map.Entry<K,V> e : this) |
4803 |
< |
c.add(e); |
4804 |
< |
return c.toArray(); |
4800 |
> |
|
4801 |
> |
public final int hashCode() { |
4802 |
> |
int h = 0; |
4803 |
> |
Node<K,V>[] t; |
4804 |
> |
if ((t = map.table) != null) { |
4805 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
4806 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) { |
4807 |
> |
h += p.hashCode(); |
4808 |
> |
} |
4809 |
> |
} |
4810 |
> |
return h; |
4811 |
|
} |
4812 |
< |
public <T> T[] toArray(T[] a) { |
4813 |
< |
Collection<Map.Entry<K,V>> c = new ArrayList<Map.Entry<K,V>>(size()); |
4814 |
< |
for (Map.Entry<K,V> e : this) |
4815 |
< |
c.add(e); |
4816 |
< |
return c.toArray(a); |
4812 |
> |
|
4813 |
> |
public final boolean equals(Object o) { |
4814 |
> |
Set<?> c; |
4815 |
> |
return ((o instanceof Set) && |
4816 |
> |
((c = (Set<?>)o) == this || |
4817 |
> |
(containsAll(c) && c.containsAll(this)))); |
4818 |
> |
} |
4819 |
> |
|
4820 |
> |
public Spliterator<Map.Entry<K,V>> spliterator() { |
4821 |
> |
Node<K,V>[] t; |
4822 |
> |
ConcurrentHashMap<K,V> m = map; |
4823 |
> |
long n = m.sumCount(); |
4824 |
> |
int f = (t = m.table) == null ? 0 : t.length; |
4825 |
> |
return new EntrySpliterator<K,V>(t, f, 0, f, n < 0L ? 0L : n, m); |
4826 |
> |
} |
4827 |
> |
|
4828 |
> |
public void forEach(Consumer<? super Map.Entry<K,V>> action) { |
4829 |
> |
if (action == null) throw new NullPointerException(); |
4830 |
> |
Node<K,V>[] t; |
4831 |
> |
if ((t = map.table) != null) { |
4832 |
> |
Traverser<K,V> it = new Traverser<K,V>(t, t.length, 0, t.length); |
4833 |
> |
for (Node<K,V> p; (p = it.advance()) != null; ) |
4834 |
> |
action.accept(new MapEntry<K,V>(p.key, p.val, map)); |
4835 |
> |
} |
4836 |
|
} |
4837 |
|
|
4838 |
|
} |
4839 |
|
|
4840 |
< |
/* ---------------- Serialization Support -------------- */ |
4840 |
> |
// ------------------------------------------------------- |
4841 |
|
|
4842 |
|
/** |
4843 |
< |
* Save the state of the <tt>ConcurrentHashMap</tt> instance to a |
4844 |
< |
* stream (i.e., serialize it). |
1263 |
< |
* @param s the stream |
1264 |
< |
* @serialData |
1265 |
< |
* the key (Object) and value (Object) |
1266 |
< |
* for each key-value mapping, followed by a null pair. |
1267 |
< |
* The key-value mappings are emitted in no particular order. |
4843 |
> |
* Base class for bulk tasks. Repeats some fields and code from |
4844 |
> |
* class Traverser, because we need to subclass CountedCompleter. |
4845 |
|
*/ |
4846 |
< |
private void writeObject(java.io.ObjectOutputStream s) throws IOException { |
4847 |
< |
s.defaultWriteObject(); |
4846 |
> |
@SuppressWarnings("serial") |
4847 |
> |
abstract static class BulkTask<K,V,R> extends CountedCompleter<R> { |
4848 |
> |
Node<K,V>[] tab; // same as Traverser |
4849 |
> |
Node<K,V> next; |
4850 |
> |
TableStack<K,V> stack, spare; |
4851 |
> |
int index; |
4852 |
> |
int baseIndex; |
4853 |
> |
int baseLimit; |
4854 |
> |
final int baseSize; |
4855 |
> |
int batch; // split control |
4856 |
> |
|
4857 |
> |
BulkTask(BulkTask<K,V,?> par, int b, int i, int f, Node<K,V>[] t) { |
4858 |
> |
super(par); |
4859 |
> |
this.batch = b; |
4860 |
> |
this.index = this.baseIndex = i; |
4861 |
> |
if ((this.tab = t) == null) |
4862 |
> |
this.baseSize = this.baseLimit = 0; |
4863 |
> |
else if (par == null) |
4864 |
> |
this.baseSize = this.baseLimit = t.length; |
4865 |
> |
else { |
4866 |
> |
this.baseLimit = f; |
4867 |
> |
this.baseSize = par.baseSize; |
4868 |
> |
} |
4869 |
> |
} |
4870 |
|
|
4871 |
< |
for (int k = 0; k < segments.length; ++k) { |
4872 |
< |
Segment<K,V> seg = segments[k]; |
4873 |
< |
seg.lock(); |
4874 |
< |
try { |
4875 |
< |
HashEntry<K,V>[] tab = seg.table; |
4876 |
< |
for (int i = 0; i < tab.length; ++i) { |
4877 |
< |
for (HashEntry<K,V> e = tab[i]; e != null; e = e.next) { |
4878 |
< |
s.writeObject(e.key); |
4879 |
< |
s.writeObject(e.value); |
4871 |
> |
/** |
4872 |
> |
* Same as Traverser version. |
4873 |
> |
*/ |
4874 |
> |
final Node<K,V> advance() { |
4875 |
> |
Node<K,V> e; |
4876 |
> |
if ((e = next) != null) |
4877 |
> |
e = e.next; |
4878 |
> |
for (;;) { |
4879 |
> |
Node<K,V>[] t; int i, n; |
4880 |
> |
if (e != null) |
4881 |
> |
return next = e; |
4882 |
> |
if (baseIndex >= baseLimit || (t = tab) == null || |
4883 |
> |
(n = t.length) <= (i = index) || i < 0) |
4884 |
> |
return next = null; |
4885 |
> |
if ((e = tabAt(t, i)) != null && e.hash < 0) { |
4886 |
> |
if (e instanceof ForwardingNode) { |
4887 |
> |
tab = ((ForwardingNode<K,V>)e).nextTable; |
4888 |
> |
e = null; |
4889 |
> |
pushState(t, i, n); |
4890 |
> |
continue; |
4891 |
|
} |
4892 |
+ |
else if (e instanceof TreeBin) |
4893 |
+ |
e = ((TreeBin<K,V>)e).first; |
4894 |
+ |
else |
4895 |
+ |
e = null; |
4896 |
|
} |
4897 |
< |
} finally { |
4898 |
< |
seg.unlock(); |
4897 |
> |
if (stack != null) |
4898 |
> |
recoverState(n); |
4899 |
> |
else if ((index = i + baseSize) >= n) |
4900 |
> |
index = ++baseIndex; |
4901 |
|
} |
4902 |
|
} |
4903 |
< |
s.writeObject(null); |
4904 |
< |
s.writeObject(null); |
4903 |
> |
|
4904 |
> |
private void pushState(Node<K,V>[] t, int i, int n) { |
4905 |
> |
TableStack<K,V> s = spare; |
4906 |
> |
if (s != null) |
4907 |
> |
spare = s.next; |
4908 |
> |
else |
4909 |
> |
s = new TableStack<K,V>(); |
4910 |
> |
s.tab = t; |
4911 |
> |
s.length = n; |
4912 |
> |
s.index = i; |
4913 |
> |
s.next = stack; |
4914 |
> |
stack = s; |
4915 |
> |
} |
4916 |
> |
|
4917 |
> |
private void recoverState(int n) { |
4918 |
> |
TableStack<K,V> s; int len; |
4919 |
> |
while ((s = stack) != null && (index += (len = s.length)) >= n) { |
4920 |
> |
n = len; |
4921 |
> |
index = s.index; |
4922 |
> |
tab = s.tab; |
4923 |
> |
s.tab = null; |
4924 |
> |
TableStack<K,V> next = s.next; |
4925 |
> |
s.next = spare; // save for reuse |
4926 |
> |
stack = next; |
4927 |
> |
spare = s; |
4928 |
> |
} |
4929 |
> |
if (s == null && (index += baseSize) >= n) |
4930 |
> |
index = ++baseIndex; |
4931 |
> |
} |
4932 |
|
} |
4933 |
|
|
4934 |
< |
/** |
4935 |
< |
* Reconstitute the <tt>ConcurrentHashMap</tt> instance from a |
4936 |
< |
* stream (i.e., deserialize it). |
4937 |
< |
* @param s the stream |
4938 |
< |
*/ |
4939 |
< |
private void readObject(java.io.ObjectInputStream s) |
4940 |
< |
throws IOException, ClassNotFoundException { |
4941 |
< |
s.defaultReadObject(); |
4934 |
> |
/* |
4935 |
> |
* Task classes. Coded in a regular but ugly format/style to |
4936 |
> |
* simplify checks that each variant differs in the right way from |
4937 |
> |
* others. The null screenings exist because compilers cannot tell |
4938 |
> |
* that we've already null-checked task arguments, so we force |
4939 |
> |
* simplest hoisted bypass to help avoid convoluted traps. |
4940 |
> |
*/ |
4941 |
> |
@SuppressWarnings("serial") |
4942 |
> |
static final class ForEachKeyTask<K,V> |
4943 |
> |
extends BulkTask<K,V,Void> { |
4944 |
> |
final Consumer<? super K> action; |
4945 |
> |
ForEachKeyTask |
4946 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
4947 |
> |
Consumer<? super K> action) { |
4948 |
> |
super(p, b, i, f, t); |
4949 |
> |
this.action = action; |
4950 |
> |
} |
4951 |
> |
public final void compute() { |
4952 |
> |
final Consumer<? super K> action; |
4953 |
> |
if ((action = this.action) != null) { |
4954 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
4955 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
4956 |
> |
addToPendingCount(1); |
4957 |
> |
new ForEachKeyTask<K,V> |
4958 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
4959 |
> |
action).fork(); |
4960 |
> |
} |
4961 |
> |
for (Node<K,V> p; (p = advance()) != null;) |
4962 |
> |
action.accept(p.key); |
4963 |
> |
propagateCompletion(); |
4964 |
> |
} |
4965 |
> |
} |
4966 |
> |
} |
4967 |
|
|
4968 |
< |
// Initialize each segment to be minimally sized, and let grow. |
4969 |
< |
for (int i = 0; i < segments.length; ++i) { |
4970 |
< |
segments[i].setTable(new HashEntry[1]); |
4968 |
> |
@SuppressWarnings("serial") |
4969 |
> |
static final class ForEachValueTask<K,V> |
4970 |
> |
extends BulkTask<K,V,Void> { |
4971 |
> |
final Consumer<? super V> action; |
4972 |
> |
ForEachValueTask |
4973 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
4974 |
> |
Consumer<? super V> action) { |
4975 |
> |
super(p, b, i, f, t); |
4976 |
> |
this.action = action; |
4977 |
> |
} |
4978 |
> |
public final void compute() { |
4979 |
> |
final Consumer<? super V> action; |
4980 |
> |
if ((action = this.action) != null) { |
4981 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
4982 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
4983 |
> |
addToPendingCount(1); |
4984 |
> |
new ForEachValueTask<K,V> |
4985 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
4986 |
> |
action).fork(); |
4987 |
> |
} |
4988 |
> |
for (Node<K,V> p; (p = advance()) != null;) |
4989 |
> |
action.accept(p.val); |
4990 |
> |
propagateCompletion(); |
4991 |
> |
} |
4992 |
|
} |
4993 |
+ |
} |
4994 |
|
|
4995 |
< |
// Read the keys and values, and put the mappings in the table |
4996 |
< |
for (;;) { |
4997 |
< |
K key = (K) s.readObject(); |
4998 |
< |
V value = (V) s.readObject(); |
4999 |
< |
if (key == null) |
5000 |
< |
break; |
5001 |
< |
put(key, value); |
4995 |
> |
@SuppressWarnings("serial") |
4996 |
> |
static final class ForEachEntryTask<K,V> |
4997 |
> |
extends BulkTask<K,V,Void> { |
4998 |
> |
final Consumer<? super Entry<K,V>> action; |
4999 |
> |
ForEachEntryTask |
5000 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5001 |
> |
Consumer<? super Entry<K,V>> action) { |
5002 |
> |
super(p, b, i, f, t); |
5003 |
> |
this.action = action; |
5004 |
> |
} |
5005 |
> |
public final void compute() { |
5006 |
> |
final Consumer<? super Entry<K,V>> action; |
5007 |
> |
if ((action = this.action) != null) { |
5008 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5009 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5010 |
> |
addToPendingCount(1); |
5011 |
> |
new ForEachEntryTask<K,V> |
5012 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5013 |
> |
action).fork(); |
5014 |
> |
} |
5015 |
> |
for (Node<K,V> p; (p = advance()) != null; ) |
5016 |
> |
action.accept(p); |
5017 |
> |
propagateCompletion(); |
5018 |
> |
} |
5019 |
> |
} |
5020 |
> |
} |
5021 |
> |
|
5022 |
> |
@SuppressWarnings("serial") |
5023 |
> |
static final class ForEachMappingTask<K,V> |
5024 |
> |
extends BulkTask<K,V,Void> { |
5025 |
> |
final BiConsumer<? super K, ? super V> action; |
5026 |
> |
ForEachMappingTask |
5027 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5028 |
> |
BiConsumer<? super K,? super V> action) { |
5029 |
> |
super(p, b, i, f, t); |
5030 |
> |
this.action = action; |
5031 |
> |
} |
5032 |
> |
public final void compute() { |
5033 |
> |
final BiConsumer<? super K, ? super V> action; |
5034 |
> |
if ((action = this.action) != null) { |
5035 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5036 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5037 |
> |
addToPendingCount(1); |
5038 |
> |
new ForEachMappingTask<K,V> |
5039 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5040 |
> |
action).fork(); |
5041 |
> |
} |
5042 |
> |
for (Node<K,V> p; (p = advance()) != null; ) |
5043 |
> |
action.accept(p.key, p.val); |
5044 |
> |
propagateCompletion(); |
5045 |
> |
} |
5046 |
> |
} |
5047 |
> |
} |
5048 |
> |
|
5049 |
> |
@SuppressWarnings("serial") |
5050 |
> |
static final class ForEachTransformedKeyTask<K,V,U> |
5051 |
> |
extends BulkTask<K,V,Void> { |
5052 |
> |
final Function<? super K, ? extends U> transformer; |
5053 |
> |
final Consumer<? super U> action; |
5054 |
> |
ForEachTransformedKeyTask |
5055 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5056 |
> |
Function<? super K, ? extends U> transformer, Consumer<? super U> action) { |
5057 |
> |
super(p, b, i, f, t); |
5058 |
> |
this.transformer = transformer; this.action = action; |
5059 |
> |
} |
5060 |
> |
public final void compute() { |
5061 |
> |
final Function<? super K, ? extends U> transformer; |
5062 |
> |
final Consumer<? super U> action; |
5063 |
> |
if ((transformer = this.transformer) != null && |
5064 |
> |
(action = this.action) != null) { |
5065 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5066 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5067 |
> |
addToPendingCount(1); |
5068 |
> |
new ForEachTransformedKeyTask<K,V,U> |
5069 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5070 |
> |
transformer, action).fork(); |
5071 |
> |
} |
5072 |
> |
for (Node<K,V> p; (p = advance()) != null; ) { |
5073 |
> |
U u; |
5074 |
> |
if ((u = transformer.apply(p.key)) != null) |
5075 |
> |
action.accept(u); |
5076 |
> |
} |
5077 |
> |
propagateCompletion(); |
5078 |
> |
} |
5079 |
> |
} |
5080 |
> |
} |
5081 |
> |
|
5082 |
> |
@SuppressWarnings("serial") |
5083 |
> |
static final class ForEachTransformedValueTask<K,V,U> |
5084 |
> |
extends BulkTask<K,V,Void> { |
5085 |
> |
final Function<? super V, ? extends U> transformer; |
5086 |
> |
final Consumer<? super U> action; |
5087 |
> |
ForEachTransformedValueTask |
5088 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5089 |
> |
Function<? super V, ? extends U> transformer, Consumer<? super U> action) { |
5090 |
> |
super(p, b, i, f, t); |
5091 |
> |
this.transformer = transformer; this.action = action; |
5092 |
> |
} |
5093 |
> |
public final void compute() { |
5094 |
> |
final Function<? super V, ? extends U> transformer; |
5095 |
> |
final Consumer<? super U> action; |
5096 |
> |
if ((transformer = this.transformer) != null && |
5097 |
> |
(action = this.action) != null) { |
5098 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5099 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5100 |
> |
addToPendingCount(1); |
5101 |
> |
new ForEachTransformedValueTask<K,V,U> |
5102 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5103 |
> |
transformer, action).fork(); |
5104 |
> |
} |
5105 |
> |
for (Node<K,V> p; (p = advance()) != null; ) { |
5106 |
> |
U u; |
5107 |
> |
if ((u = transformer.apply(p.val)) != null) |
5108 |
> |
action.accept(u); |
5109 |
> |
} |
5110 |
> |
propagateCompletion(); |
5111 |
> |
} |
5112 |
> |
} |
5113 |
> |
} |
5114 |
> |
|
5115 |
> |
@SuppressWarnings("serial") |
5116 |
> |
static final class ForEachTransformedEntryTask<K,V,U> |
5117 |
> |
extends BulkTask<K,V,Void> { |
5118 |
> |
final Function<Map.Entry<K,V>, ? extends U> transformer; |
5119 |
> |
final Consumer<? super U> action; |
5120 |
> |
ForEachTransformedEntryTask |
5121 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5122 |
> |
Function<Map.Entry<K,V>, ? extends U> transformer, Consumer<? super U> action) { |
5123 |
> |
super(p, b, i, f, t); |
5124 |
> |
this.transformer = transformer; this.action = action; |
5125 |
> |
} |
5126 |
> |
public final void compute() { |
5127 |
> |
final Function<Map.Entry<K,V>, ? extends U> transformer; |
5128 |
> |
final Consumer<? super U> action; |
5129 |
> |
if ((transformer = this.transformer) != null && |
5130 |
> |
(action = this.action) != null) { |
5131 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5132 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5133 |
> |
addToPendingCount(1); |
5134 |
> |
new ForEachTransformedEntryTask<K,V,U> |
5135 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5136 |
> |
transformer, action).fork(); |
5137 |
> |
} |
5138 |
> |
for (Node<K,V> p; (p = advance()) != null; ) { |
5139 |
> |
U u; |
5140 |
> |
if ((u = transformer.apply(p)) != null) |
5141 |
> |
action.accept(u); |
5142 |
> |
} |
5143 |
> |
propagateCompletion(); |
5144 |
> |
} |
5145 |
> |
} |
5146 |
> |
} |
5147 |
> |
|
5148 |
> |
@SuppressWarnings("serial") |
5149 |
> |
static final class ForEachTransformedMappingTask<K,V,U> |
5150 |
> |
extends BulkTask<K,V,Void> { |
5151 |
> |
final BiFunction<? super K, ? super V, ? extends U> transformer; |
5152 |
> |
final Consumer<? super U> action; |
5153 |
> |
ForEachTransformedMappingTask |
5154 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5155 |
> |
BiFunction<? super K, ? super V, ? extends U> transformer, |
5156 |
> |
Consumer<? super U> action) { |
5157 |
> |
super(p, b, i, f, t); |
5158 |
> |
this.transformer = transformer; this.action = action; |
5159 |
> |
} |
5160 |
> |
public final void compute() { |
5161 |
> |
final BiFunction<? super K, ? super V, ? extends U> transformer; |
5162 |
> |
final Consumer<? super U> action; |
5163 |
> |
if ((transformer = this.transformer) != null && |
5164 |
> |
(action = this.action) != null) { |
5165 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5166 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5167 |
> |
addToPendingCount(1); |
5168 |
> |
new ForEachTransformedMappingTask<K,V,U> |
5169 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5170 |
> |
transformer, action).fork(); |
5171 |
> |
} |
5172 |
> |
for (Node<K,V> p; (p = advance()) != null; ) { |
5173 |
> |
U u; |
5174 |
> |
if ((u = transformer.apply(p.key, p.val)) != null) |
5175 |
> |
action.accept(u); |
5176 |
> |
} |
5177 |
> |
propagateCompletion(); |
5178 |
> |
} |
5179 |
> |
} |
5180 |
> |
} |
5181 |
> |
|
5182 |
> |
@SuppressWarnings("serial") |
5183 |
> |
static final class SearchKeysTask<K,V,U> |
5184 |
> |
extends BulkTask<K,V,U> { |
5185 |
> |
final Function<? super K, ? extends U> searchFunction; |
5186 |
> |
final AtomicReference<U> result; |
5187 |
> |
SearchKeysTask |
5188 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5189 |
> |
Function<? super K, ? extends U> searchFunction, |
5190 |
> |
AtomicReference<U> result) { |
5191 |
> |
super(p, b, i, f, t); |
5192 |
> |
this.searchFunction = searchFunction; this.result = result; |
5193 |
> |
} |
5194 |
> |
public final U getRawResult() { return result.get(); } |
5195 |
> |
public final void compute() { |
5196 |
> |
final Function<? super K, ? extends U> searchFunction; |
5197 |
> |
final AtomicReference<U> result; |
5198 |
> |
if ((searchFunction = this.searchFunction) != null && |
5199 |
> |
(result = this.result) != null) { |
5200 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5201 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5202 |
> |
if (result.get() != null) |
5203 |
> |
return; |
5204 |
> |
addToPendingCount(1); |
5205 |
> |
new SearchKeysTask<K,V,U> |
5206 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5207 |
> |
searchFunction, result).fork(); |
5208 |
> |
} |
5209 |
> |
while (result.get() == null) { |
5210 |
> |
U u; |
5211 |
> |
Node<K,V> p; |
5212 |
> |
if ((p = advance()) == null) { |
5213 |
> |
propagateCompletion(); |
5214 |
> |
break; |
5215 |
> |
} |
5216 |
> |
if ((u = searchFunction.apply(p.key)) != null) { |
5217 |
> |
if (result.compareAndSet(null, u)) |
5218 |
> |
quietlyCompleteRoot(); |
5219 |
> |
break; |
5220 |
> |
} |
5221 |
> |
} |
5222 |
> |
} |
5223 |
> |
} |
5224 |
> |
} |
5225 |
> |
|
5226 |
> |
@SuppressWarnings("serial") |
5227 |
> |
static final class SearchValuesTask<K,V,U> |
5228 |
> |
extends BulkTask<K,V,U> { |
5229 |
> |
final Function<? super V, ? extends U> searchFunction; |
5230 |
> |
final AtomicReference<U> result; |
5231 |
> |
SearchValuesTask |
5232 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5233 |
> |
Function<? super V, ? extends U> searchFunction, |
5234 |
> |
AtomicReference<U> result) { |
5235 |
> |
super(p, b, i, f, t); |
5236 |
> |
this.searchFunction = searchFunction; this.result = result; |
5237 |
> |
} |
5238 |
> |
public final U getRawResult() { return result.get(); } |
5239 |
> |
public final void compute() { |
5240 |
> |
final Function<? super V, ? extends U> searchFunction; |
5241 |
> |
final AtomicReference<U> result; |
5242 |
> |
if ((searchFunction = this.searchFunction) != null && |
5243 |
> |
(result = this.result) != null) { |
5244 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5245 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5246 |
> |
if (result.get() != null) |
5247 |
> |
return; |
5248 |
> |
addToPendingCount(1); |
5249 |
> |
new SearchValuesTask<K,V,U> |
5250 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5251 |
> |
searchFunction, result).fork(); |
5252 |
> |
} |
5253 |
> |
while (result.get() == null) { |
5254 |
> |
U u; |
5255 |
> |
Node<K,V> p; |
5256 |
> |
if ((p = advance()) == null) { |
5257 |
> |
propagateCompletion(); |
5258 |
> |
break; |
5259 |
> |
} |
5260 |
> |
if ((u = searchFunction.apply(p.val)) != null) { |
5261 |
> |
if (result.compareAndSet(null, u)) |
5262 |
> |
quietlyCompleteRoot(); |
5263 |
> |
break; |
5264 |
> |
} |
5265 |
> |
} |
5266 |
> |
} |
5267 |
> |
} |
5268 |
> |
} |
5269 |
> |
|
5270 |
> |
@SuppressWarnings("serial") |
5271 |
> |
static final class SearchEntriesTask<K,V,U> |
5272 |
> |
extends BulkTask<K,V,U> { |
5273 |
> |
final Function<Entry<K,V>, ? extends U> searchFunction; |
5274 |
> |
final AtomicReference<U> result; |
5275 |
> |
SearchEntriesTask |
5276 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5277 |
> |
Function<Entry<K,V>, ? extends U> searchFunction, |
5278 |
> |
AtomicReference<U> result) { |
5279 |
> |
super(p, b, i, f, t); |
5280 |
> |
this.searchFunction = searchFunction; this.result = result; |
5281 |
> |
} |
5282 |
> |
public final U getRawResult() { return result.get(); } |
5283 |
> |
public final void compute() { |
5284 |
> |
final Function<Entry<K,V>, ? extends U> searchFunction; |
5285 |
> |
final AtomicReference<U> result; |
5286 |
> |
if ((searchFunction = this.searchFunction) != null && |
5287 |
> |
(result = this.result) != null) { |
5288 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5289 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5290 |
> |
if (result.get() != null) |
5291 |
> |
return; |
5292 |
> |
addToPendingCount(1); |
5293 |
> |
new SearchEntriesTask<K,V,U> |
5294 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5295 |
> |
searchFunction, result).fork(); |
5296 |
> |
} |
5297 |
> |
while (result.get() == null) { |
5298 |
> |
U u; |
5299 |
> |
Node<K,V> p; |
5300 |
> |
if ((p = advance()) == null) { |
5301 |
> |
propagateCompletion(); |
5302 |
> |
break; |
5303 |
> |
} |
5304 |
> |
if ((u = searchFunction.apply(p)) != null) { |
5305 |
> |
if (result.compareAndSet(null, u)) |
5306 |
> |
quietlyCompleteRoot(); |
5307 |
> |
return; |
5308 |
> |
} |
5309 |
> |
} |
5310 |
> |
} |
5311 |
> |
} |
5312 |
> |
} |
5313 |
> |
|
5314 |
> |
@SuppressWarnings("serial") |
5315 |
> |
static final class SearchMappingsTask<K,V,U> |
5316 |
> |
extends BulkTask<K,V,U> { |
5317 |
> |
final BiFunction<? super K, ? super V, ? extends U> searchFunction; |
5318 |
> |
final AtomicReference<U> result; |
5319 |
> |
SearchMappingsTask |
5320 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5321 |
> |
BiFunction<? super K, ? super V, ? extends U> searchFunction, |
5322 |
> |
AtomicReference<U> result) { |
5323 |
> |
super(p, b, i, f, t); |
5324 |
> |
this.searchFunction = searchFunction; this.result = result; |
5325 |
> |
} |
5326 |
> |
public final U getRawResult() { return result.get(); } |
5327 |
> |
public final void compute() { |
5328 |
> |
final BiFunction<? super K, ? super V, ? extends U> searchFunction; |
5329 |
> |
final AtomicReference<U> result; |
5330 |
> |
if ((searchFunction = this.searchFunction) != null && |
5331 |
> |
(result = this.result) != null) { |
5332 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5333 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5334 |
> |
if (result.get() != null) |
5335 |
> |
return; |
5336 |
> |
addToPendingCount(1); |
5337 |
> |
new SearchMappingsTask<K,V,U> |
5338 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5339 |
> |
searchFunction, result).fork(); |
5340 |
> |
} |
5341 |
> |
while (result.get() == null) { |
5342 |
> |
U u; |
5343 |
> |
Node<K,V> p; |
5344 |
> |
if ((p = advance()) == null) { |
5345 |
> |
propagateCompletion(); |
5346 |
> |
break; |
5347 |
> |
} |
5348 |
> |
if ((u = searchFunction.apply(p.key, p.val)) != null) { |
5349 |
> |
if (result.compareAndSet(null, u)) |
5350 |
> |
quietlyCompleteRoot(); |
5351 |
> |
break; |
5352 |
> |
} |
5353 |
> |
} |
5354 |
> |
} |
5355 |
> |
} |
5356 |
> |
} |
5357 |
> |
|
5358 |
> |
@SuppressWarnings("serial") |
5359 |
> |
static final class ReduceKeysTask<K,V> |
5360 |
> |
extends BulkTask<K,V,K> { |
5361 |
> |
final BiFunction<? super K, ? super K, ? extends K> reducer; |
5362 |
> |
K result; |
5363 |
> |
ReduceKeysTask<K,V> rights, nextRight; |
5364 |
> |
ReduceKeysTask |
5365 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5366 |
> |
ReduceKeysTask<K,V> nextRight, |
5367 |
> |
BiFunction<? super K, ? super K, ? extends K> reducer) { |
5368 |
> |
super(p, b, i, f, t); this.nextRight = nextRight; |
5369 |
> |
this.reducer = reducer; |
5370 |
> |
} |
5371 |
> |
public final K getRawResult() { return result; } |
5372 |
> |
public final void compute() { |
5373 |
> |
final BiFunction<? super K, ? super K, ? extends K> reducer; |
5374 |
> |
if ((reducer = this.reducer) != null) { |
5375 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5376 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5377 |
> |
addToPendingCount(1); |
5378 |
> |
(rights = new ReduceKeysTask<K,V> |
5379 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5380 |
> |
rights, reducer)).fork(); |
5381 |
> |
} |
5382 |
> |
K r = null; |
5383 |
> |
for (Node<K,V> p; (p = advance()) != null; ) { |
5384 |
> |
K u = p.key; |
5385 |
> |
r = (r == null) ? u : u == null ? r : reducer.apply(r, u); |
5386 |
> |
} |
5387 |
> |
result = r; |
5388 |
> |
CountedCompleter<?> c; |
5389 |
> |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5390 |
> |
@SuppressWarnings("unchecked") |
5391 |
> |
ReduceKeysTask<K,V> |
5392 |
> |
t = (ReduceKeysTask<K,V>)c, |
5393 |
> |
s = t.rights; |
5394 |
> |
while (s != null) { |
5395 |
> |
K tr, sr; |
5396 |
> |
if ((sr = s.result) != null) |
5397 |
> |
t.result = (((tr = t.result) == null) ? sr : |
5398 |
> |
reducer.apply(tr, sr)); |
5399 |
> |
s = t.rights = s.nextRight; |
5400 |
> |
} |
5401 |
> |
} |
5402 |
> |
} |
5403 |
> |
} |
5404 |
> |
} |
5405 |
> |
|
5406 |
> |
@SuppressWarnings("serial") |
5407 |
> |
static final class ReduceValuesTask<K,V> |
5408 |
> |
extends BulkTask<K,V,V> { |
5409 |
> |
final BiFunction<? super V, ? super V, ? extends V> reducer; |
5410 |
> |
V result; |
5411 |
> |
ReduceValuesTask<K,V> rights, nextRight; |
5412 |
> |
ReduceValuesTask |
5413 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5414 |
> |
ReduceValuesTask<K,V> nextRight, |
5415 |
> |
BiFunction<? super V, ? super V, ? extends V> reducer) { |
5416 |
> |
super(p, b, i, f, t); this.nextRight = nextRight; |
5417 |
> |
this.reducer = reducer; |
5418 |
> |
} |
5419 |
> |
public final V getRawResult() { return result; } |
5420 |
> |
public final void compute() { |
5421 |
> |
final BiFunction<? super V, ? super V, ? extends V> reducer; |
5422 |
> |
if ((reducer = this.reducer) != null) { |
5423 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5424 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5425 |
> |
addToPendingCount(1); |
5426 |
> |
(rights = new ReduceValuesTask<K,V> |
5427 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5428 |
> |
rights, reducer)).fork(); |
5429 |
> |
} |
5430 |
> |
V r = null; |
5431 |
> |
for (Node<K,V> p; (p = advance()) != null; ) { |
5432 |
> |
V v = p.val; |
5433 |
> |
r = (r == null) ? v : reducer.apply(r, v); |
5434 |
> |
} |
5435 |
> |
result = r; |
5436 |
> |
CountedCompleter<?> c; |
5437 |
> |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5438 |
> |
@SuppressWarnings("unchecked") |
5439 |
> |
ReduceValuesTask<K,V> |
5440 |
> |
t = (ReduceValuesTask<K,V>)c, |
5441 |
> |
s = t.rights; |
5442 |
> |
while (s != null) { |
5443 |
> |
V tr, sr; |
5444 |
> |
if ((sr = s.result) != null) |
5445 |
> |
t.result = (((tr = t.result) == null) ? sr : |
5446 |
> |
reducer.apply(tr, sr)); |
5447 |
> |
s = t.rights = s.nextRight; |
5448 |
> |
} |
5449 |
> |
} |
5450 |
> |
} |
5451 |
> |
} |
5452 |
> |
} |
5453 |
> |
|
5454 |
> |
@SuppressWarnings("serial") |
5455 |
> |
static final class ReduceEntriesTask<K,V> |
5456 |
> |
extends BulkTask<K,V,Map.Entry<K,V>> { |
5457 |
> |
final BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer; |
5458 |
> |
Map.Entry<K,V> result; |
5459 |
> |
ReduceEntriesTask<K,V> rights, nextRight; |
5460 |
> |
ReduceEntriesTask |
5461 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5462 |
> |
ReduceEntriesTask<K,V> nextRight, |
5463 |
> |
BiFunction<Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer) { |
5464 |
> |
super(p, b, i, f, t); this.nextRight = nextRight; |
5465 |
> |
this.reducer = reducer; |
5466 |
> |
} |
5467 |
> |
public final Map.Entry<K,V> getRawResult() { return result; } |
5468 |
> |
public final void compute() { |
5469 |
> |
final BiFunction<Map.Entry<K,V>, Map.Entry<K,V>, ? extends Map.Entry<K,V>> reducer; |
5470 |
> |
if ((reducer = this.reducer) != null) { |
5471 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5472 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5473 |
> |
addToPendingCount(1); |
5474 |
> |
(rights = new ReduceEntriesTask<K,V> |
5475 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5476 |
> |
rights, reducer)).fork(); |
5477 |
> |
} |
5478 |
> |
Map.Entry<K,V> r = null; |
5479 |
> |
for (Node<K,V> p; (p = advance()) != null; ) |
5480 |
> |
r = (r == null) ? p : reducer.apply(r, p); |
5481 |
> |
result = r; |
5482 |
> |
CountedCompleter<?> c; |
5483 |
> |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5484 |
> |
@SuppressWarnings("unchecked") |
5485 |
> |
ReduceEntriesTask<K,V> |
5486 |
> |
t = (ReduceEntriesTask<K,V>)c, |
5487 |
> |
s = t.rights; |
5488 |
> |
while (s != null) { |
5489 |
> |
Map.Entry<K,V> tr, sr; |
5490 |
> |
if ((sr = s.result) != null) |
5491 |
> |
t.result = (((tr = t.result) == null) ? sr : |
5492 |
> |
reducer.apply(tr, sr)); |
5493 |
> |
s = t.rights = s.nextRight; |
5494 |
> |
} |
5495 |
> |
} |
5496 |
> |
} |
5497 |
> |
} |
5498 |
> |
} |
5499 |
> |
|
5500 |
> |
@SuppressWarnings("serial") |
5501 |
> |
static final class MapReduceKeysTask<K,V,U> |
5502 |
> |
extends BulkTask<K,V,U> { |
5503 |
> |
final Function<? super K, ? extends U> transformer; |
5504 |
> |
final BiFunction<? super U, ? super U, ? extends U> reducer; |
5505 |
> |
U result; |
5506 |
> |
MapReduceKeysTask<K,V,U> rights, nextRight; |
5507 |
> |
MapReduceKeysTask |
5508 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5509 |
> |
MapReduceKeysTask<K,V,U> nextRight, |
5510 |
> |
Function<? super K, ? extends U> transformer, |
5511 |
> |
BiFunction<? super U, ? super U, ? extends U> reducer) { |
5512 |
> |
super(p, b, i, f, t); this.nextRight = nextRight; |
5513 |
> |
this.transformer = transformer; |
5514 |
> |
this.reducer = reducer; |
5515 |
> |
} |
5516 |
> |
public final U getRawResult() { return result; } |
5517 |
> |
public final void compute() { |
5518 |
> |
final Function<? super K, ? extends U> transformer; |
5519 |
> |
final BiFunction<? super U, ? super U, ? extends U> reducer; |
5520 |
> |
if ((transformer = this.transformer) != null && |
5521 |
> |
(reducer = this.reducer) != null) { |
5522 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5523 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5524 |
> |
addToPendingCount(1); |
5525 |
> |
(rights = new MapReduceKeysTask<K,V,U> |
5526 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5527 |
> |
rights, transformer, reducer)).fork(); |
5528 |
> |
} |
5529 |
> |
U r = null; |
5530 |
> |
for (Node<K,V> p; (p = advance()) != null; ) { |
5531 |
> |
U u; |
5532 |
> |
if ((u = transformer.apply(p.key)) != null) |
5533 |
> |
r = (r == null) ? u : reducer.apply(r, u); |
5534 |
> |
} |
5535 |
> |
result = r; |
5536 |
> |
CountedCompleter<?> c; |
5537 |
> |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5538 |
> |
@SuppressWarnings("unchecked") |
5539 |
> |
MapReduceKeysTask<K,V,U> |
5540 |
> |
t = (MapReduceKeysTask<K,V,U>)c, |
5541 |
> |
s = t.rights; |
5542 |
> |
while (s != null) { |
5543 |
> |
U tr, sr; |
5544 |
> |
if ((sr = s.result) != null) |
5545 |
> |
t.result = (((tr = t.result) == null) ? sr : |
5546 |
> |
reducer.apply(tr, sr)); |
5547 |
> |
s = t.rights = s.nextRight; |
5548 |
> |
} |
5549 |
> |
} |
5550 |
> |
} |
5551 |
> |
} |
5552 |
> |
} |
5553 |
> |
|
5554 |
> |
@SuppressWarnings("serial") |
5555 |
> |
static final class MapReduceValuesTask<K,V,U> |
5556 |
> |
extends BulkTask<K,V,U> { |
5557 |
> |
final Function<? super V, ? extends U> transformer; |
5558 |
> |
final BiFunction<? super U, ? super U, ? extends U> reducer; |
5559 |
> |
U result; |
5560 |
> |
MapReduceValuesTask<K,V,U> rights, nextRight; |
5561 |
> |
MapReduceValuesTask |
5562 |
> |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5563 |
> |
MapReduceValuesTask<K,V,U> nextRight, |
5564 |
> |
Function<? super V, ? extends U> transformer, |
5565 |
> |
BiFunction<? super U, ? super U, ? extends U> reducer) { |
5566 |
> |
super(p, b, i, f, t); this.nextRight = nextRight; |
5567 |
> |
this.transformer = transformer; |
5568 |
> |
this.reducer = reducer; |
5569 |
> |
} |
5570 |
> |
public final U getRawResult() { return result; } |
5571 |
> |
public final void compute() { |
5572 |
> |
final Function<? super V, ? extends U> transformer; |
5573 |
> |
final BiFunction<? super U, ? super U, ? extends U> reducer; |
5574 |
> |
if ((transformer = this.transformer) != null && |
5575 |
> |
(reducer = this.reducer) != null) { |
5576 |
> |
for (int i = baseIndex, f, h; batch > 0 && |
5577 |
> |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5578 |
> |
addToPendingCount(1); |
5579 |
> |
(rights = new MapReduceValuesTask<K,V,U> |
5580 |
> |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5581 |
> |
rights, transformer, reducer)).fork(); |
5582 |
> |
} |
5583 |
> |
U r = null; |
5584 |
> |
for (Node<K,V> p; (p = advance()) != null; ) { |
5585 |
> |
U u; |
5586 |
> |
if ((u = transformer.apply(p.val)) != null) |
5587 |
> |
r = (r == null) ? u : reducer.apply(r, u); |
5588 |
> |
} |
5589 |
> |
result = r; |
5590 |
> |
CountedCompleter<?> c; |
5591 |
> |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5592 |
> |
@SuppressWarnings("unchecked") |
5593 |
> |
MapReduceValuesTask<K,V,U> |
5594 |
> |
t = (MapReduceValuesTask<K,V,U>)c, |
5595 |
> |
s = t.rights; |
5596 |
> |
while (s != null) { |
5597 |
> |
U tr, sr; |
5598 |
> |
if ((sr = s.result) != null) |
5599 |
> |
t.result = (((tr = t.result) == null) ? sr : |
5600 |
> |
reducer.apply(tr, sr)); |
5601 |
> |
s = t.rights = s.nextRight; |
5602 |
> |
} |
5603 |
> |
} |
5604 |
> |
} |
5605 |
|
} |
5606 |
|
} |
5607 |
+ |
|
5608 |
+ |
@SuppressWarnings("serial") |
5609 |
+ |
static final class MapReduceEntriesTask<K,V,U> |
5610 |
+ |
extends BulkTask<K,V,U> { |
5611 |
+ |
final Function<Map.Entry<K,V>, ? extends U> transformer; |
5612 |
+ |
final BiFunction<? super U, ? super U, ? extends U> reducer; |
5613 |
+ |
U result; |
5614 |
+ |
MapReduceEntriesTask<K,V,U> rights, nextRight; |
5615 |
+ |
MapReduceEntriesTask |
5616 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5617 |
+ |
MapReduceEntriesTask<K,V,U> nextRight, |
5618 |
+ |
Function<Map.Entry<K,V>, ? extends U> transformer, |
5619 |
+ |
BiFunction<? super U, ? super U, ? extends U> reducer) { |
5620 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
5621 |
+ |
this.transformer = transformer; |
5622 |
+ |
this.reducer = reducer; |
5623 |
+ |
} |
5624 |
+ |
public final U getRawResult() { return result; } |
5625 |
+ |
public final void compute() { |
5626 |
+ |
final Function<Map.Entry<K,V>, ? extends U> transformer; |
5627 |
+ |
final BiFunction<? super U, ? super U, ? extends U> reducer; |
5628 |
+ |
if ((transformer = this.transformer) != null && |
5629 |
+ |
(reducer = this.reducer) != null) { |
5630 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
5631 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5632 |
+ |
addToPendingCount(1); |
5633 |
+ |
(rights = new MapReduceEntriesTask<K,V,U> |
5634 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5635 |
+ |
rights, transformer, reducer)).fork(); |
5636 |
+ |
} |
5637 |
+ |
U r = null; |
5638 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) { |
5639 |
+ |
U u; |
5640 |
+ |
if ((u = transformer.apply(p)) != null) |
5641 |
+ |
r = (r == null) ? u : reducer.apply(r, u); |
5642 |
+ |
} |
5643 |
+ |
result = r; |
5644 |
+ |
CountedCompleter<?> c; |
5645 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5646 |
+ |
@SuppressWarnings("unchecked") |
5647 |
+ |
MapReduceEntriesTask<K,V,U> |
5648 |
+ |
t = (MapReduceEntriesTask<K,V,U>)c, |
5649 |
+ |
s = t.rights; |
5650 |
+ |
while (s != null) { |
5651 |
+ |
U tr, sr; |
5652 |
+ |
if ((sr = s.result) != null) |
5653 |
+ |
t.result = (((tr = t.result) == null) ? sr : |
5654 |
+ |
reducer.apply(tr, sr)); |
5655 |
+ |
s = t.rights = s.nextRight; |
5656 |
+ |
} |
5657 |
+ |
} |
5658 |
+ |
} |
5659 |
+ |
} |
5660 |
+ |
} |
5661 |
+ |
|
5662 |
+ |
@SuppressWarnings("serial") |
5663 |
+ |
static final class MapReduceMappingsTask<K,V,U> |
5664 |
+ |
extends BulkTask<K,V,U> { |
5665 |
+ |
final BiFunction<? super K, ? super V, ? extends U> transformer; |
5666 |
+ |
final BiFunction<? super U, ? super U, ? extends U> reducer; |
5667 |
+ |
U result; |
5668 |
+ |
MapReduceMappingsTask<K,V,U> rights, nextRight; |
5669 |
+ |
MapReduceMappingsTask |
5670 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5671 |
+ |
MapReduceMappingsTask<K,V,U> nextRight, |
5672 |
+ |
BiFunction<? super K, ? super V, ? extends U> transformer, |
5673 |
+ |
BiFunction<? super U, ? super U, ? extends U> reducer) { |
5674 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
5675 |
+ |
this.transformer = transformer; |
5676 |
+ |
this.reducer = reducer; |
5677 |
+ |
} |
5678 |
+ |
public final U getRawResult() { return result; } |
5679 |
+ |
public final void compute() { |
5680 |
+ |
final BiFunction<? super K, ? super V, ? extends U> transformer; |
5681 |
+ |
final BiFunction<? super U, ? super U, ? extends U> reducer; |
5682 |
+ |
if ((transformer = this.transformer) != null && |
5683 |
+ |
(reducer = this.reducer) != null) { |
5684 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
5685 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5686 |
+ |
addToPendingCount(1); |
5687 |
+ |
(rights = new MapReduceMappingsTask<K,V,U> |
5688 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5689 |
+ |
rights, transformer, reducer)).fork(); |
5690 |
+ |
} |
5691 |
+ |
U r = null; |
5692 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) { |
5693 |
+ |
U u; |
5694 |
+ |
if ((u = transformer.apply(p.key, p.val)) != null) |
5695 |
+ |
r = (r == null) ? u : reducer.apply(r, u); |
5696 |
+ |
} |
5697 |
+ |
result = r; |
5698 |
+ |
CountedCompleter<?> c; |
5699 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5700 |
+ |
@SuppressWarnings("unchecked") |
5701 |
+ |
MapReduceMappingsTask<K,V,U> |
5702 |
+ |
t = (MapReduceMappingsTask<K,V,U>)c, |
5703 |
+ |
s = t.rights; |
5704 |
+ |
while (s != null) { |
5705 |
+ |
U tr, sr; |
5706 |
+ |
if ((sr = s.result) != null) |
5707 |
+ |
t.result = (((tr = t.result) == null) ? sr : |
5708 |
+ |
reducer.apply(tr, sr)); |
5709 |
+ |
s = t.rights = s.nextRight; |
5710 |
+ |
} |
5711 |
+ |
} |
5712 |
+ |
} |
5713 |
+ |
} |
5714 |
+ |
} |
5715 |
+ |
|
5716 |
+ |
@SuppressWarnings("serial") |
5717 |
+ |
static final class MapReduceKeysToDoubleTask<K,V> |
5718 |
+ |
extends BulkTask<K,V,Double> { |
5719 |
+ |
final ToDoubleFunction<? super K> transformer; |
5720 |
+ |
final DoubleBinaryOperator reducer; |
5721 |
+ |
final double basis; |
5722 |
+ |
double result; |
5723 |
+ |
MapReduceKeysToDoubleTask<K,V> rights, nextRight; |
5724 |
+ |
MapReduceKeysToDoubleTask |
5725 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5726 |
+ |
MapReduceKeysToDoubleTask<K,V> nextRight, |
5727 |
+ |
ToDoubleFunction<? super K> transformer, |
5728 |
+ |
double basis, |
5729 |
+ |
DoubleBinaryOperator reducer) { |
5730 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
5731 |
+ |
this.transformer = transformer; |
5732 |
+ |
this.basis = basis; this.reducer = reducer; |
5733 |
+ |
} |
5734 |
+ |
public final Double getRawResult() { return result; } |
5735 |
+ |
public final void compute() { |
5736 |
+ |
final ToDoubleFunction<? super K> transformer; |
5737 |
+ |
final DoubleBinaryOperator reducer; |
5738 |
+ |
if ((transformer = this.transformer) != null && |
5739 |
+ |
(reducer = this.reducer) != null) { |
5740 |
+ |
double r = this.basis; |
5741 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
5742 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5743 |
+ |
addToPendingCount(1); |
5744 |
+ |
(rights = new MapReduceKeysToDoubleTask<K,V> |
5745 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5746 |
+ |
rights, transformer, r, reducer)).fork(); |
5747 |
+ |
} |
5748 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
5749 |
+ |
r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.key)); |
5750 |
+ |
result = r; |
5751 |
+ |
CountedCompleter<?> c; |
5752 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5753 |
+ |
@SuppressWarnings("unchecked") |
5754 |
+ |
MapReduceKeysToDoubleTask<K,V> |
5755 |
+ |
t = (MapReduceKeysToDoubleTask<K,V>)c, |
5756 |
+ |
s = t.rights; |
5757 |
+ |
while (s != null) { |
5758 |
+ |
t.result = reducer.applyAsDouble(t.result, s.result); |
5759 |
+ |
s = t.rights = s.nextRight; |
5760 |
+ |
} |
5761 |
+ |
} |
5762 |
+ |
} |
5763 |
+ |
} |
5764 |
+ |
} |
5765 |
+ |
|
5766 |
+ |
@SuppressWarnings("serial") |
5767 |
+ |
static final class MapReduceValuesToDoubleTask<K,V> |
5768 |
+ |
extends BulkTask<K,V,Double> { |
5769 |
+ |
final ToDoubleFunction<? super V> transformer; |
5770 |
+ |
final DoubleBinaryOperator reducer; |
5771 |
+ |
final double basis; |
5772 |
+ |
double result; |
5773 |
+ |
MapReduceValuesToDoubleTask<K,V> rights, nextRight; |
5774 |
+ |
MapReduceValuesToDoubleTask |
5775 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5776 |
+ |
MapReduceValuesToDoubleTask<K,V> nextRight, |
5777 |
+ |
ToDoubleFunction<? super V> transformer, |
5778 |
+ |
double basis, |
5779 |
+ |
DoubleBinaryOperator reducer) { |
5780 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
5781 |
+ |
this.transformer = transformer; |
5782 |
+ |
this.basis = basis; this.reducer = reducer; |
5783 |
+ |
} |
5784 |
+ |
public final Double getRawResult() { return result; } |
5785 |
+ |
public final void compute() { |
5786 |
+ |
final ToDoubleFunction<? super V> transformer; |
5787 |
+ |
final DoubleBinaryOperator reducer; |
5788 |
+ |
if ((transformer = this.transformer) != null && |
5789 |
+ |
(reducer = this.reducer) != null) { |
5790 |
+ |
double r = this.basis; |
5791 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
5792 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5793 |
+ |
addToPendingCount(1); |
5794 |
+ |
(rights = new MapReduceValuesToDoubleTask<K,V> |
5795 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5796 |
+ |
rights, transformer, r, reducer)).fork(); |
5797 |
+ |
} |
5798 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
5799 |
+ |
r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.val)); |
5800 |
+ |
result = r; |
5801 |
+ |
CountedCompleter<?> c; |
5802 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5803 |
+ |
@SuppressWarnings("unchecked") |
5804 |
+ |
MapReduceValuesToDoubleTask<K,V> |
5805 |
+ |
t = (MapReduceValuesToDoubleTask<K,V>)c, |
5806 |
+ |
s = t.rights; |
5807 |
+ |
while (s != null) { |
5808 |
+ |
t.result = reducer.applyAsDouble(t.result, s.result); |
5809 |
+ |
s = t.rights = s.nextRight; |
5810 |
+ |
} |
5811 |
+ |
} |
5812 |
+ |
} |
5813 |
+ |
} |
5814 |
+ |
} |
5815 |
+ |
|
5816 |
+ |
@SuppressWarnings("serial") |
5817 |
+ |
static final class MapReduceEntriesToDoubleTask<K,V> |
5818 |
+ |
extends BulkTask<K,V,Double> { |
5819 |
+ |
final ToDoubleFunction<Map.Entry<K,V>> transformer; |
5820 |
+ |
final DoubleBinaryOperator reducer; |
5821 |
+ |
final double basis; |
5822 |
+ |
double result; |
5823 |
+ |
MapReduceEntriesToDoubleTask<K,V> rights, nextRight; |
5824 |
+ |
MapReduceEntriesToDoubleTask |
5825 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5826 |
+ |
MapReduceEntriesToDoubleTask<K,V> nextRight, |
5827 |
+ |
ToDoubleFunction<Map.Entry<K,V>> transformer, |
5828 |
+ |
double basis, |
5829 |
+ |
DoubleBinaryOperator reducer) { |
5830 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
5831 |
+ |
this.transformer = transformer; |
5832 |
+ |
this.basis = basis; this.reducer = reducer; |
5833 |
+ |
} |
5834 |
+ |
public final Double getRawResult() { return result; } |
5835 |
+ |
public final void compute() { |
5836 |
+ |
final ToDoubleFunction<Map.Entry<K,V>> transformer; |
5837 |
+ |
final DoubleBinaryOperator reducer; |
5838 |
+ |
if ((transformer = this.transformer) != null && |
5839 |
+ |
(reducer = this.reducer) != null) { |
5840 |
+ |
double r = this.basis; |
5841 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
5842 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5843 |
+ |
addToPendingCount(1); |
5844 |
+ |
(rights = new MapReduceEntriesToDoubleTask<K,V> |
5845 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5846 |
+ |
rights, transformer, r, reducer)).fork(); |
5847 |
+ |
} |
5848 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
5849 |
+ |
r = reducer.applyAsDouble(r, transformer.applyAsDouble(p)); |
5850 |
+ |
result = r; |
5851 |
+ |
CountedCompleter<?> c; |
5852 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5853 |
+ |
@SuppressWarnings("unchecked") |
5854 |
+ |
MapReduceEntriesToDoubleTask<K,V> |
5855 |
+ |
t = (MapReduceEntriesToDoubleTask<K,V>)c, |
5856 |
+ |
s = t.rights; |
5857 |
+ |
while (s != null) { |
5858 |
+ |
t.result = reducer.applyAsDouble(t.result, s.result); |
5859 |
+ |
s = t.rights = s.nextRight; |
5860 |
+ |
} |
5861 |
+ |
} |
5862 |
+ |
} |
5863 |
+ |
} |
5864 |
+ |
} |
5865 |
+ |
|
5866 |
+ |
@SuppressWarnings("serial") |
5867 |
+ |
static final class MapReduceMappingsToDoubleTask<K,V> |
5868 |
+ |
extends BulkTask<K,V,Double> { |
5869 |
+ |
final ToDoubleBiFunction<? super K, ? super V> transformer; |
5870 |
+ |
final DoubleBinaryOperator reducer; |
5871 |
+ |
final double basis; |
5872 |
+ |
double result; |
5873 |
+ |
MapReduceMappingsToDoubleTask<K,V> rights, nextRight; |
5874 |
+ |
MapReduceMappingsToDoubleTask |
5875 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5876 |
+ |
MapReduceMappingsToDoubleTask<K,V> nextRight, |
5877 |
+ |
ToDoubleBiFunction<? super K, ? super V> transformer, |
5878 |
+ |
double basis, |
5879 |
+ |
DoubleBinaryOperator reducer) { |
5880 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
5881 |
+ |
this.transformer = transformer; |
5882 |
+ |
this.basis = basis; this.reducer = reducer; |
5883 |
+ |
} |
5884 |
+ |
public final Double getRawResult() { return result; } |
5885 |
+ |
public final void compute() { |
5886 |
+ |
final ToDoubleBiFunction<? super K, ? super V> transformer; |
5887 |
+ |
final DoubleBinaryOperator reducer; |
5888 |
+ |
if ((transformer = this.transformer) != null && |
5889 |
+ |
(reducer = this.reducer) != null) { |
5890 |
+ |
double r = this.basis; |
5891 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
5892 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5893 |
+ |
addToPendingCount(1); |
5894 |
+ |
(rights = new MapReduceMappingsToDoubleTask<K,V> |
5895 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5896 |
+ |
rights, transformer, r, reducer)).fork(); |
5897 |
+ |
} |
5898 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
5899 |
+ |
r = reducer.applyAsDouble(r, transformer.applyAsDouble(p.key, p.val)); |
5900 |
+ |
result = r; |
5901 |
+ |
CountedCompleter<?> c; |
5902 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5903 |
+ |
@SuppressWarnings("unchecked") |
5904 |
+ |
MapReduceMappingsToDoubleTask<K,V> |
5905 |
+ |
t = (MapReduceMappingsToDoubleTask<K,V>)c, |
5906 |
+ |
s = t.rights; |
5907 |
+ |
while (s != null) { |
5908 |
+ |
t.result = reducer.applyAsDouble(t.result, s.result); |
5909 |
+ |
s = t.rights = s.nextRight; |
5910 |
+ |
} |
5911 |
+ |
} |
5912 |
+ |
} |
5913 |
+ |
} |
5914 |
+ |
} |
5915 |
+ |
|
5916 |
+ |
@SuppressWarnings("serial") |
5917 |
+ |
static final class MapReduceKeysToLongTask<K,V> |
5918 |
+ |
extends BulkTask<K,V,Long> { |
5919 |
+ |
final ToLongFunction<? super K> transformer; |
5920 |
+ |
final LongBinaryOperator reducer; |
5921 |
+ |
final long basis; |
5922 |
+ |
long result; |
5923 |
+ |
MapReduceKeysToLongTask<K,V> rights, nextRight; |
5924 |
+ |
MapReduceKeysToLongTask |
5925 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5926 |
+ |
MapReduceKeysToLongTask<K,V> nextRight, |
5927 |
+ |
ToLongFunction<? super K> transformer, |
5928 |
+ |
long basis, |
5929 |
+ |
LongBinaryOperator reducer) { |
5930 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
5931 |
+ |
this.transformer = transformer; |
5932 |
+ |
this.basis = basis; this.reducer = reducer; |
5933 |
+ |
} |
5934 |
+ |
public final Long getRawResult() { return result; } |
5935 |
+ |
public final void compute() { |
5936 |
+ |
final ToLongFunction<? super K> transformer; |
5937 |
+ |
final LongBinaryOperator reducer; |
5938 |
+ |
if ((transformer = this.transformer) != null && |
5939 |
+ |
(reducer = this.reducer) != null) { |
5940 |
+ |
long r = this.basis; |
5941 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
5942 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5943 |
+ |
addToPendingCount(1); |
5944 |
+ |
(rights = new MapReduceKeysToLongTask<K,V> |
5945 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5946 |
+ |
rights, transformer, r, reducer)).fork(); |
5947 |
+ |
} |
5948 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
5949 |
+ |
r = reducer.applyAsLong(r, transformer.applyAsLong(p.key)); |
5950 |
+ |
result = r; |
5951 |
+ |
CountedCompleter<?> c; |
5952 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
5953 |
+ |
@SuppressWarnings("unchecked") |
5954 |
+ |
MapReduceKeysToLongTask<K,V> |
5955 |
+ |
t = (MapReduceKeysToLongTask<K,V>)c, |
5956 |
+ |
s = t.rights; |
5957 |
+ |
while (s != null) { |
5958 |
+ |
t.result = reducer.applyAsLong(t.result, s.result); |
5959 |
+ |
s = t.rights = s.nextRight; |
5960 |
+ |
} |
5961 |
+ |
} |
5962 |
+ |
} |
5963 |
+ |
} |
5964 |
+ |
} |
5965 |
+ |
|
5966 |
+ |
@SuppressWarnings("serial") |
5967 |
+ |
static final class MapReduceValuesToLongTask<K,V> |
5968 |
+ |
extends BulkTask<K,V,Long> { |
5969 |
+ |
final ToLongFunction<? super V> transformer; |
5970 |
+ |
final LongBinaryOperator reducer; |
5971 |
+ |
final long basis; |
5972 |
+ |
long result; |
5973 |
+ |
MapReduceValuesToLongTask<K,V> rights, nextRight; |
5974 |
+ |
MapReduceValuesToLongTask |
5975 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
5976 |
+ |
MapReduceValuesToLongTask<K,V> nextRight, |
5977 |
+ |
ToLongFunction<? super V> transformer, |
5978 |
+ |
long basis, |
5979 |
+ |
LongBinaryOperator reducer) { |
5980 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
5981 |
+ |
this.transformer = transformer; |
5982 |
+ |
this.basis = basis; this.reducer = reducer; |
5983 |
+ |
} |
5984 |
+ |
public final Long getRawResult() { return result; } |
5985 |
+ |
public final void compute() { |
5986 |
+ |
final ToLongFunction<? super V> transformer; |
5987 |
+ |
final LongBinaryOperator reducer; |
5988 |
+ |
if ((transformer = this.transformer) != null && |
5989 |
+ |
(reducer = this.reducer) != null) { |
5990 |
+ |
long r = this.basis; |
5991 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
5992 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
5993 |
+ |
addToPendingCount(1); |
5994 |
+ |
(rights = new MapReduceValuesToLongTask<K,V> |
5995 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
5996 |
+ |
rights, transformer, r, reducer)).fork(); |
5997 |
+ |
} |
5998 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
5999 |
+ |
r = reducer.applyAsLong(r, transformer.applyAsLong(p.val)); |
6000 |
+ |
result = r; |
6001 |
+ |
CountedCompleter<?> c; |
6002 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
6003 |
+ |
@SuppressWarnings("unchecked") |
6004 |
+ |
MapReduceValuesToLongTask<K,V> |
6005 |
+ |
t = (MapReduceValuesToLongTask<K,V>)c, |
6006 |
+ |
s = t.rights; |
6007 |
+ |
while (s != null) { |
6008 |
+ |
t.result = reducer.applyAsLong(t.result, s.result); |
6009 |
+ |
s = t.rights = s.nextRight; |
6010 |
+ |
} |
6011 |
+ |
} |
6012 |
+ |
} |
6013 |
+ |
} |
6014 |
+ |
} |
6015 |
+ |
|
6016 |
+ |
@SuppressWarnings("serial") |
6017 |
+ |
static final class MapReduceEntriesToLongTask<K,V> |
6018 |
+ |
extends BulkTask<K,V,Long> { |
6019 |
+ |
final ToLongFunction<Map.Entry<K,V>> transformer; |
6020 |
+ |
final LongBinaryOperator reducer; |
6021 |
+ |
final long basis; |
6022 |
+ |
long result; |
6023 |
+ |
MapReduceEntriesToLongTask<K,V> rights, nextRight; |
6024 |
+ |
MapReduceEntriesToLongTask |
6025 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
6026 |
+ |
MapReduceEntriesToLongTask<K,V> nextRight, |
6027 |
+ |
ToLongFunction<Map.Entry<K,V>> transformer, |
6028 |
+ |
long basis, |
6029 |
+ |
LongBinaryOperator reducer) { |
6030 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
6031 |
+ |
this.transformer = transformer; |
6032 |
+ |
this.basis = basis; this.reducer = reducer; |
6033 |
+ |
} |
6034 |
+ |
public final Long getRawResult() { return result; } |
6035 |
+ |
public final void compute() { |
6036 |
+ |
final ToLongFunction<Map.Entry<K,V>> transformer; |
6037 |
+ |
final LongBinaryOperator reducer; |
6038 |
+ |
if ((transformer = this.transformer) != null && |
6039 |
+ |
(reducer = this.reducer) != null) { |
6040 |
+ |
long r = this.basis; |
6041 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
6042 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
6043 |
+ |
addToPendingCount(1); |
6044 |
+ |
(rights = new MapReduceEntriesToLongTask<K,V> |
6045 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
6046 |
+ |
rights, transformer, r, reducer)).fork(); |
6047 |
+ |
} |
6048 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
6049 |
+ |
r = reducer.applyAsLong(r, transformer.applyAsLong(p)); |
6050 |
+ |
result = r; |
6051 |
+ |
CountedCompleter<?> c; |
6052 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
6053 |
+ |
@SuppressWarnings("unchecked") |
6054 |
+ |
MapReduceEntriesToLongTask<K,V> |
6055 |
+ |
t = (MapReduceEntriesToLongTask<K,V>)c, |
6056 |
+ |
s = t.rights; |
6057 |
+ |
while (s != null) { |
6058 |
+ |
t.result = reducer.applyAsLong(t.result, s.result); |
6059 |
+ |
s = t.rights = s.nextRight; |
6060 |
+ |
} |
6061 |
+ |
} |
6062 |
+ |
} |
6063 |
+ |
} |
6064 |
+ |
} |
6065 |
+ |
|
6066 |
+ |
@SuppressWarnings("serial") |
6067 |
+ |
static final class MapReduceMappingsToLongTask<K,V> |
6068 |
+ |
extends BulkTask<K,V,Long> { |
6069 |
+ |
final ToLongBiFunction<? super K, ? super V> transformer; |
6070 |
+ |
final LongBinaryOperator reducer; |
6071 |
+ |
final long basis; |
6072 |
+ |
long result; |
6073 |
+ |
MapReduceMappingsToLongTask<K,V> rights, nextRight; |
6074 |
+ |
MapReduceMappingsToLongTask |
6075 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
6076 |
+ |
MapReduceMappingsToLongTask<K,V> nextRight, |
6077 |
+ |
ToLongBiFunction<? super K, ? super V> transformer, |
6078 |
+ |
long basis, |
6079 |
+ |
LongBinaryOperator reducer) { |
6080 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
6081 |
+ |
this.transformer = transformer; |
6082 |
+ |
this.basis = basis; this.reducer = reducer; |
6083 |
+ |
} |
6084 |
+ |
public final Long getRawResult() { return result; } |
6085 |
+ |
public final void compute() { |
6086 |
+ |
final ToLongBiFunction<? super K, ? super V> transformer; |
6087 |
+ |
final LongBinaryOperator reducer; |
6088 |
+ |
if ((transformer = this.transformer) != null && |
6089 |
+ |
(reducer = this.reducer) != null) { |
6090 |
+ |
long r = this.basis; |
6091 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
6092 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
6093 |
+ |
addToPendingCount(1); |
6094 |
+ |
(rights = new MapReduceMappingsToLongTask<K,V> |
6095 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
6096 |
+ |
rights, transformer, r, reducer)).fork(); |
6097 |
+ |
} |
6098 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
6099 |
+ |
r = reducer.applyAsLong(r, transformer.applyAsLong(p.key, p.val)); |
6100 |
+ |
result = r; |
6101 |
+ |
CountedCompleter<?> c; |
6102 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
6103 |
+ |
@SuppressWarnings("unchecked") |
6104 |
+ |
MapReduceMappingsToLongTask<K,V> |
6105 |
+ |
t = (MapReduceMappingsToLongTask<K,V>)c, |
6106 |
+ |
s = t.rights; |
6107 |
+ |
while (s != null) { |
6108 |
+ |
t.result = reducer.applyAsLong(t.result, s.result); |
6109 |
+ |
s = t.rights = s.nextRight; |
6110 |
+ |
} |
6111 |
+ |
} |
6112 |
+ |
} |
6113 |
+ |
} |
6114 |
+ |
} |
6115 |
+ |
|
6116 |
+ |
@SuppressWarnings("serial") |
6117 |
+ |
static final class MapReduceKeysToIntTask<K,V> |
6118 |
+ |
extends BulkTask<K,V,Integer> { |
6119 |
+ |
final ToIntFunction<? super K> transformer; |
6120 |
+ |
final IntBinaryOperator reducer; |
6121 |
+ |
final int basis; |
6122 |
+ |
int result; |
6123 |
+ |
MapReduceKeysToIntTask<K,V> rights, nextRight; |
6124 |
+ |
MapReduceKeysToIntTask |
6125 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
6126 |
+ |
MapReduceKeysToIntTask<K,V> nextRight, |
6127 |
+ |
ToIntFunction<? super K> transformer, |
6128 |
+ |
int basis, |
6129 |
+ |
IntBinaryOperator reducer) { |
6130 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
6131 |
+ |
this.transformer = transformer; |
6132 |
+ |
this.basis = basis; this.reducer = reducer; |
6133 |
+ |
} |
6134 |
+ |
public final Integer getRawResult() { return result; } |
6135 |
+ |
public final void compute() { |
6136 |
+ |
final ToIntFunction<? super K> transformer; |
6137 |
+ |
final IntBinaryOperator reducer; |
6138 |
+ |
if ((transformer = this.transformer) != null && |
6139 |
+ |
(reducer = this.reducer) != null) { |
6140 |
+ |
int r = this.basis; |
6141 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
6142 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
6143 |
+ |
addToPendingCount(1); |
6144 |
+ |
(rights = new MapReduceKeysToIntTask<K,V> |
6145 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
6146 |
+ |
rights, transformer, r, reducer)).fork(); |
6147 |
+ |
} |
6148 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
6149 |
+ |
r = reducer.applyAsInt(r, transformer.applyAsInt(p.key)); |
6150 |
+ |
result = r; |
6151 |
+ |
CountedCompleter<?> c; |
6152 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
6153 |
+ |
@SuppressWarnings("unchecked") |
6154 |
+ |
MapReduceKeysToIntTask<K,V> |
6155 |
+ |
t = (MapReduceKeysToIntTask<K,V>)c, |
6156 |
+ |
s = t.rights; |
6157 |
+ |
while (s != null) { |
6158 |
+ |
t.result = reducer.applyAsInt(t.result, s.result); |
6159 |
+ |
s = t.rights = s.nextRight; |
6160 |
+ |
} |
6161 |
+ |
} |
6162 |
+ |
} |
6163 |
+ |
} |
6164 |
+ |
} |
6165 |
+ |
|
6166 |
+ |
@SuppressWarnings("serial") |
6167 |
+ |
static final class MapReduceValuesToIntTask<K,V> |
6168 |
+ |
extends BulkTask<K,V,Integer> { |
6169 |
+ |
final ToIntFunction<? super V> transformer; |
6170 |
+ |
final IntBinaryOperator reducer; |
6171 |
+ |
final int basis; |
6172 |
+ |
int result; |
6173 |
+ |
MapReduceValuesToIntTask<K,V> rights, nextRight; |
6174 |
+ |
MapReduceValuesToIntTask |
6175 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
6176 |
+ |
MapReduceValuesToIntTask<K,V> nextRight, |
6177 |
+ |
ToIntFunction<? super V> transformer, |
6178 |
+ |
int basis, |
6179 |
+ |
IntBinaryOperator reducer) { |
6180 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
6181 |
+ |
this.transformer = transformer; |
6182 |
+ |
this.basis = basis; this.reducer = reducer; |
6183 |
+ |
} |
6184 |
+ |
public final Integer getRawResult() { return result; } |
6185 |
+ |
public final void compute() { |
6186 |
+ |
final ToIntFunction<? super V> transformer; |
6187 |
+ |
final IntBinaryOperator reducer; |
6188 |
+ |
if ((transformer = this.transformer) != null && |
6189 |
+ |
(reducer = this.reducer) != null) { |
6190 |
+ |
int r = this.basis; |
6191 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
6192 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
6193 |
+ |
addToPendingCount(1); |
6194 |
+ |
(rights = new MapReduceValuesToIntTask<K,V> |
6195 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
6196 |
+ |
rights, transformer, r, reducer)).fork(); |
6197 |
+ |
} |
6198 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
6199 |
+ |
r = reducer.applyAsInt(r, transformer.applyAsInt(p.val)); |
6200 |
+ |
result = r; |
6201 |
+ |
CountedCompleter<?> c; |
6202 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
6203 |
+ |
@SuppressWarnings("unchecked") |
6204 |
+ |
MapReduceValuesToIntTask<K,V> |
6205 |
+ |
t = (MapReduceValuesToIntTask<K,V>)c, |
6206 |
+ |
s = t.rights; |
6207 |
+ |
while (s != null) { |
6208 |
+ |
t.result = reducer.applyAsInt(t.result, s.result); |
6209 |
+ |
s = t.rights = s.nextRight; |
6210 |
+ |
} |
6211 |
+ |
} |
6212 |
+ |
} |
6213 |
+ |
} |
6214 |
+ |
} |
6215 |
+ |
|
6216 |
+ |
@SuppressWarnings("serial") |
6217 |
+ |
static final class MapReduceEntriesToIntTask<K,V> |
6218 |
+ |
extends BulkTask<K,V,Integer> { |
6219 |
+ |
final ToIntFunction<Map.Entry<K,V>> transformer; |
6220 |
+ |
final IntBinaryOperator reducer; |
6221 |
+ |
final int basis; |
6222 |
+ |
int result; |
6223 |
+ |
MapReduceEntriesToIntTask<K,V> rights, nextRight; |
6224 |
+ |
MapReduceEntriesToIntTask |
6225 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
6226 |
+ |
MapReduceEntriesToIntTask<K,V> nextRight, |
6227 |
+ |
ToIntFunction<Map.Entry<K,V>> transformer, |
6228 |
+ |
int basis, |
6229 |
+ |
IntBinaryOperator reducer) { |
6230 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
6231 |
+ |
this.transformer = transformer; |
6232 |
+ |
this.basis = basis; this.reducer = reducer; |
6233 |
+ |
} |
6234 |
+ |
public final Integer getRawResult() { return result; } |
6235 |
+ |
public final void compute() { |
6236 |
+ |
final ToIntFunction<Map.Entry<K,V>> transformer; |
6237 |
+ |
final IntBinaryOperator reducer; |
6238 |
+ |
if ((transformer = this.transformer) != null && |
6239 |
+ |
(reducer = this.reducer) != null) { |
6240 |
+ |
int r = this.basis; |
6241 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
6242 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
6243 |
+ |
addToPendingCount(1); |
6244 |
+ |
(rights = new MapReduceEntriesToIntTask<K,V> |
6245 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
6246 |
+ |
rights, transformer, r, reducer)).fork(); |
6247 |
+ |
} |
6248 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
6249 |
+ |
r = reducer.applyAsInt(r, transformer.applyAsInt(p)); |
6250 |
+ |
result = r; |
6251 |
+ |
CountedCompleter<?> c; |
6252 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
6253 |
+ |
@SuppressWarnings("unchecked") |
6254 |
+ |
MapReduceEntriesToIntTask<K,V> |
6255 |
+ |
t = (MapReduceEntriesToIntTask<K,V>)c, |
6256 |
+ |
s = t.rights; |
6257 |
+ |
while (s != null) { |
6258 |
+ |
t.result = reducer.applyAsInt(t.result, s.result); |
6259 |
+ |
s = t.rights = s.nextRight; |
6260 |
+ |
} |
6261 |
+ |
} |
6262 |
+ |
} |
6263 |
+ |
} |
6264 |
+ |
} |
6265 |
+ |
|
6266 |
+ |
@SuppressWarnings("serial") |
6267 |
+ |
static final class MapReduceMappingsToIntTask<K,V> |
6268 |
+ |
extends BulkTask<K,V,Integer> { |
6269 |
+ |
final ToIntBiFunction<? super K, ? super V> transformer; |
6270 |
+ |
final IntBinaryOperator reducer; |
6271 |
+ |
final int basis; |
6272 |
+ |
int result; |
6273 |
+ |
MapReduceMappingsToIntTask<K,V> rights, nextRight; |
6274 |
+ |
MapReduceMappingsToIntTask |
6275 |
+ |
(BulkTask<K,V,?> p, int b, int i, int f, Node<K,V>[] t, |
6276 |
+ |
MapReduceMappingsToIntTask<K,V> nextRight, |
6277 |
+ |
ToIntBiFunction<? super K, ? super V> transformer, |
6278 |
+ |
int basis, |
6279 |
+ |
IntBinaryOperator reducer) { |
6280 |
+ |
super(p, b, i, f, t); this.nextRight = nextRight; |
6281 |
+ |
this.transformer = transformer; |
6282 |
+ |
this.basis = basis; this.reducer = reducer; |
6283 |
+ |
} |
6284 |
+ |
public final Integer getRawResult() { return result; } |
6285 |
+ |
public final void compute() { |
6286 |
+ |
final ToIntBiFunction<? super K, ? super V> transformer; |
6287 |
+ |
final IntBinaryOperator reducer; |
6288 |
+ |
if ((transformer = this.transformer) != null && |
6289 |
+ |
(reducer = this.reducer) != null) { |
6290 |
+ |
int r = this.basis; |
6291 |
+ |
for (int i = baseIndex, f, h; batch > 0 && |
6292 |
+ |
(h = ((f = baseLimit) + i) >>> 1) > i;) { |
6293 |
+ |
addToPendingCount(1); |
6294 |
+ |
(rights = new MapReduceMappingsToIntTask<K,V> |
6295 |
+ |
(this, batch >>>= 1, baseLimit = h, f, tab, |
6296 |
+ |
rights, transformer, r, reducer)).fork(); |
6297 |
+ |
} |
6298 |
+ |
for (Node<K,V> p; (p = advance()) != null; ) |
6299 |
+ |
r = reducer.applyAsInt(r, transformer.applyAsInt(p.key, p.val)); |
6300 |
+ |
result = r; |
6301 |
+ |
CountedCompleter<?> c; |
6302 |
+ |
for (c = firstComplete(); c != null; c = c.nextComplete()) { |
6303 |
+ |
@SuppressWarnings("unchecked") |
6304 |
+ |
MapReduceMappingsToIntTask<K,V> |
6305 |
+ |
t = (MapReduceMappingsToIntTask<K,V>)c, |
6306 |
+ |
s = t.rights; |
6307 |
+ |
while (s != null) { |
6308 |
+ |
t.result = reducer.applyAsInt(t.result, s.result); |
6309 |
+ |
s = t.rights = s.nextRight; |
6310 |
+ |
} |
6311 |
+ |
} |
6312 |
+ |
} |
6313 |
+ |
} |
6314 |
+ |
} |
6315 |
+ |
|
6316 |
+ |
// Unsafe mechanics |
6317 |
+ |
private static final Unsafe U = Unsafe.getUnsafe(); |
6318 |
+ |
private static final long SIZECTL = U.objectFieldOffset( |
6319 |
+ |
ConcurrentHashMap.class, "sizeCtl"); |
6320 |
+ |
private static final long TRANSFERINDEX = U.objectFieldOffset( |
6321 |
+ |
ConcurrentHashMap.class, "transferIndex"); |
6322 |
+ |
private static final long BASECOUNT = U.objectFieldOffset( |
6323 |
+ |
ConcurrentHashMap.class, "baseCount"); |
6324 |
+ |
private static final long CELLSBUSY = U.objectFieldOffset( |
6325 |
+ |
ConcurrentHashMap.class, "cellsBusy"); |
6326 |
+ |
private static final long CELLVALUE = U.objectFieldOffset( |
6327 |
+ |
CounterCell.class, "value"); |
6328 |
+ |
private static final int ABASE = U.arrayBaseOffset(Node[].class); |
6329 |
+ |
private static final int ASHIFT; |
6330 |
+ |
|
6331 |
+ |
static { |
6332 |
+ |
int scale = U.arrayIndexScale(Node[].class); |
6333 |
+ |
if ((scale & (scale - 1)) != 0) |
6334 |
+ |
throw new ExceptionInInitializerError("array index scale not a power of two"); |
6335 |
+ |
ASHIFT = 31 - Integer.numberOfLeadingZeros(scale); |
6336 |
+ |
|
6337 |
+ |
// Reduce the risk of rare disastrous classloading in first call to |
6338 |
+ |
// LockSupport.park: https://bugs.openjdk.java.net/browse/JDK-8074773 |
6339 |
+ |
Class<?> ensureLoaded = LockSupport.class; |
6340 |
+ |
|
6341 |
+ |
// Eager class load observed to help JIT during startup |
6342 |
+ |
ensureLoaded = ReservationNode.class; |
6343 |
+ |
} |
6344 |
|
} |