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/publicdomain/zero/1.0/ |
5 |
*/ |
6 |
|
7 |
package java.util.concurrent; |
8 |
import java.util.function.Supplier; |
9 |
import java.util.function.Block; |
10 |
import java.util.function.BiBlock; |
11 |
import java.util.function.Function; |
12 |
import java.util.function.BiFunction; |
13 |
import java.util.concurrent.Future; |
14 |
import java.util.concurrent.TimeUnit; |
15 |
import java.util.concurrent.ForkJoinPool; |
16 |
import java.util.concurrent.ForkJoinTask; |
17 |
import java.util.concurrent.Executor; |
18 |
import java.util.concurrent.ThreadLocalRandom; |
19 |
import java.util.concurrent.ExecutionException; |
20 |
import java.util.concurrent.TimeoutException; |
21 |
import java.util.concurrent.CancellationException; |
22 |
import java.util.concurrent.atomic.AtomicInteger; |
23 |
import java.util.concurrent.locks.LockSupport; |
24 |
|
25 |
/** |
26 |
* A {@link Future} that may be explicitly completed (setting its |
27 |
* value and status), and may include dependent functions and actions |
28 |
* that trigger upon its completion. |
29 |
* |
30 |
* <p>Similar methods are available for Functions, Blocks, and |
31 |
* Runnables, depending on whether actions require arguments and/or |
32 |
* produce results. Functions and actions supplied for dependent |
33 |
* completions (mainly using methods with prefix {@code then}) may be |
34 |
* performed by the thread that completes the current |
35 |
* CompletableFuture, or by any other caller of these methods. There |
36 |
* are no guarantees about the order of processing completions unless |
37 |
* constrained by method {@code then} and related methods. |
38 |
* |
39 |
* <p>When two or more threads attempt to {@link #complete} or {@link |
40 |
* #completeExceptionally} a CompletableFuture, only one of them will |
41 |
* succeed. Upon exceptional completion, or when a completion entails |
42 |
* computation of a function or action, and it terminates abruptly |
43 |
* with an exception, then further completions act as {@code |
44 |
* completeExceptionally} with that exception. |
45 |
* |
46 |
* <p>CompletableFutures themselves do not execute asynchronously. |
47 |
* However, the {@code async} methods provide commonly useful ways to |
48 |
* commence asynchronous processing, using either a given {@link |
49 |
* Executor} or by default the {@link ForkJoinPool#commonPool()}, of a |
50 |
* function or action that will result in the completion of a new |
51 |
* CompletableFuture. |
52 |
* |
53 |
* @author Doug Lea |
54 |
* @since 1.8 |
55 |
*/ |
56 |
public class CompletableFuture<T> implements Future<T> { |
57 |
/* |
58 |
* Quick overview (more to come): |
59 |
* |
60 |
* 1. Non-nullness of field result indicates done. An AltResult is |
61 |
* used to box null as a result, as well as to hold exceptions. |
62 |
* |
63 |
* 2. Waiters are held in a Treiber stack similar to the one used |
64 |
* in FutureTask. |
65 |
* |
66 |
* 3. Completions are also kept in a list/stack, and pulled off |
67 |
* and run when completion is triggered. |
68 |
*/ |
69 |
|
70 |
static final class AltResult { |
71 |
final Throwable ex; // null only for NIL |
72 |
AltResult(Throwable ex) { this.ex = ex; } |
73 |
} |
74 |
|
75 |
static final AltResult NIL = new AltResult(null); |
76 |
|
77 |
/** |
78 |
* Simple linked list nodes to record waiting threads in a Treiber |
79 |
* stack. See other classes such as Phaser and SynchronousQueue |
80 |
* for more detailed explanation. |
81 |
*/ |
82 |
static final class WaitNode { |
83 |
volatile Thread thread; |
84 |
volatile WaitNode next; |
85 |
} |
86 |
|
87 |
/** |
88 |
* Simple linked list nodes to record completions, used in |
89 |
* basically the same way as WaitNodes |
90 |
*/ |
91 |
static final class CompletionNode { |
92 |
final Completion completion; |
93 |
volatile CompletionNode next; |
94 |
CompletionNode(Completion completion) { this.completion = completion; } |
95 |
} |
96 |
|
97 |
|
98 |
volatile Object result; // either the result or boxed AltResult |
99 |
volatile WaitNode waiters; // Treiber stack of threads blocked on get() |
100 |
volatile CompletionNode completions; // list (Treiber stack) of completions |
101 |
|
102 |
/** |
103 |
* Creates a new incomplete CompletableFuture. |
104 |
*/ |
105 |
public CompletableFuture() { |
106 |
} |
107 |
|
108 |
/** |
109 |
* Asynchronously executes in the {@link |
110 |
* ForkJoinPool#commonPool()}, a task that completes the returned |
111 |
* CompletableFuture with the result of the given Supplier. |
112 |
* |
113 |
* @param supplier a function returning the value to be used |
114 |
* to complete the returned CompletableFuture. |
115 |
* @return the CompletableFuture |
116 |
*/ |
117 |
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier) { |
118 |
if (supplier == null) throw new NullPointerException(); |
119 |
CompletableFuture<U> f = new CompletableFuture<U>(); |
120 |
ForkJoinPool.commonPool(). |
121 |
execute((ForkJoinTask<?>)new AsyncSupplier<U>(supplier, f)); |
122 |
return f; |
123 |
} |
124 |
|
125 |
/** |
126 |
* Asynchronously executes using the given executor, a task that |
127 |
* completes the returned CompletableFuture with the result of the |
128 |
* given Supplier. |
129 |
* |
130 |
* @param supplier a function returning the value to be used |
131 |
* to complete the returned CompletableFuture |
132 |
* @param executor the executor to use for asynchronous execution |
133 |
* @return the CompletableFuture |
134 |
*/ |
135 |
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier, |
136 |
Executor executor) { |
137 |
if (executor == null || supplier == null) |
138 |
throw new NullPointerException(); |
139 |
CompletableFuture<U> f = new CompletableFuture<U>(); |
140 |
executor.execute(new AsyncSupplier<U>(supplier, f)); |
141 |
return f; |
142 |
} |
143 |
|
144 |
/** |
145 |
* Asynchronously executes in the {@link |
146 |
* ForkJoinPool#commonPool()} a task that runs the given action, |
147 |
* and then completes the returned CompletableFuture. |
148 |
* |
149 |
* @param runnable the action to run before completing the |
150 |
* returned CompletableFuture |
151 |
* @return the CompletableFuture |
152 |
*/ |
153 |
public static CompletableFuture<Void> runAsync(Runnable runnable) { |
154 |
if (runnable == null) throw new NullPointerException(); |
155 |
CompletableFuture<Void> f = new CompletableFuture<Void>(); |
156 |
ForkJoinPool.commonPool(). |
157 |
execute((ForkJoinTask<?>)new AsyncRunnable(runnable, f)); |
158 |
return f; |
159 |
} |
160 |
|
161 |
/** |
162 |
* Asynchronously executes using the given executor, a task that |
163 |
* runs the given action, and then completes the returned |
164 |
* CompletableFuture. |
165 |
* |
166 |
* @param runnable the action to run before completing the |
167 |
* returned CompletableFuture |
168 |
* @param executor the executor to use for asynchronous execution |
169 |
* @return the CompletableFuture |
170 |
*/ |
171 |
public static CompletableFuture<Void> runAsync(Runnable runnable, |
172 |
Executor executor) { |
173 |
if (executor == null || runnable == null) |
174 |
throw new NullPointerException(); |
175 |
CompletableFuture<Void> f = new CompletableFuture<Void>(); |
176 |
executor.execute(new AsyncRunnable(runnable, f)); |
177 |
return f; |
178 |
} |
179 |
|
180 |
/** |
181 |
* Returns {@code true} if completed in any fashion: normally, |
182 |
* exceptionally, or cancellation. |
183 |
* |
184 |
* @return {@code true} if completed |
185 |
*/ |
186 |
public boolean isDone() { |
187 |
return result != null; |
188 |
} |
189 |
|
190 |
/** |
191 |
* Returns the result value when complete, or throws an |
192 |
* (unchecked) exception if completed exceptionally. To better |
193 |
* conform with the use of common functional forms, this method |
194 |
* transforms any checked exception possible with {@link |
195 |
* Future#get} into an (unchecked) {@link RuntimeException} with |
196 |
* the underlying exception as its cause. (The checked exception |
197 |
* convention is available using the timed form of get.) |
198 |
* |
199 |
* @return the result value |
200 |
*/ |
201 |
public T get() { |
202 |
Object r; Throwable ex; |
203 |
if ((r = result) == null) |
204 |
return waitingGet(); |
205 |
if (r instanceof AltResult) { |
206 |
if ((ex = ((AltResult)r).ex) != null) { |
207 |
if (ex instanceof Error) |
208 |
throw (Error)ex; |
209 |
if (ex instanceof RuntimeException) |
210 |
throw (RuntimeException)ex; |
211 |
throw new RuntimeException(ex); |
212 |
} |
213 |
return null; |
214 |
} |
215 |
return (T)r; |
216 |
} |
217 |
|
218 |
/** |
219 |
* Returns the result value (or throws any encountered exception) |
220 |
* if completed, else returns the given valueIfAbsent. |
221 |
* |
222 |
* @param valueIfAbsent the value to return if not completed |
223 |
* @return the result value, if completed, else the given valueIfAbsent |
224 |
*/ |
225 |
public T getNow(T valueIfAbsent) { |
226 |
Object r; Throwable ex; |
227 |
if ((r = result) == null) |
228 |
return valueIfAbsent; |
229 |
if (r instanceof AltResult) { |
230 |
if ((ex = ((AltResult)r).ex) != null) { |
231 |
if (ex instanceof Error) |
232 |
throw (Error)ex; |
233 |
if (ex instanceof RuntimeException) |
234 |
throw (RuntimeException)ex; |
235 |
throw new RuntimeException(ex); |
236 |
} |
237 |
return null; |
238 |
} |
239 |
return (T)r; |
240 |
} |
241 |
|
242 |
/** |
243 |
* Waits if necessary for at most the given time for completion, |
244 |
* and then retrieves its result, if available. |
245 |
* |
246 |
* @param timeout the maximum time to wait |
247 |
* @param unit the time unit of the timeout argument |
248 |
* @return the computed result |
249 |
* @throws CancellationException if the computation was cancelled |
250 |
* @throws ExecutionException if the computation threw an |
251 |
* exception |
252 |
* @throws InterruptedException if the current thread was interrupted |
253 |
* while waiting |
254 |
* @throws TimeoutException if the wait timed out |
255 |
*/ |
256 |
public T get(long timeout, TimeUnit unit) |
257 |
throws InterruptedException, ExecutionException, TimeoutException { |
258 |
Object r; Throwable ex; |
259 |
long nanos = unit.toNanos(timeout); |
260 |
if (Thread.interrupted()) |
261 |
throw new InterruptedException(); |
262 |
if ((r = result) == null) |
263 |
r = timedAwaitDone(nanos); |
264 |
if (r instanceof AltResult) { |
265 |
if ((ex = ((AltResult)r).ex) != null) { |
266 |
if (ex instanceof ExecutionException) // avoid re-wrap |
267 |
throw (ExecutionException)ex; |
268 |
throw new ExecutionException(ex); |
269 |
} |
270 |
return null; |
271 |
} |
272 |
return (T)r; |
273 |
} |
274 |
|
275 |
/** |
276 |
* If not already completed, sets the value returned by {@link |
277 |
* #get()} and related methods to the given value. |
278 |
* |
279 |
* @param value the result value |
280 |
* @return true if this invocation caused this CompletableFuture |
281 |
* to transition to a completed state, else false. |
282 |
*/ |
283 |
public boolean complete(T value) { |
284 |
if (result == null && |
285 |
UNSAFE.compareAndSwapObject(this, RESULT, null, |
286 |
(value == null) ? NIL : value)) { |
287 |
postComplete(); |
288 |
return true; |
289 |
} |
290 |
return false; |
291 |
} |
292 |
|
293 |
/** |
294 |
* If not already completed, causes invocations of {@link #get()} |
295 |
* and related methods to throw the given exception. |
296 |
* |
297 |
* @param ex the exception |
298 |
* @return true if this invocation caused this CompletableFuture |
299 |
* to transition to a completed state, else false. |
300 |
*/ |
301 |
public boolean completeExceptionally(Throwable ex) { |
302 |
if (ex == null) throw new NullPointerException(); |
303 |
if (result == null) { |
304 |
Object r = new AltResult(ex); |
305 |
if (UNSAFE.compareAndSwapObject(this, RESULT, null, r)) { |
306 |
postComplete(); |
307 |
return true; |
308 |
} |
309 |
} |
310 |
return false; |
311 |
} |
312 |
|
313 |
/** |
314 |
* Creates and returns a CompletableFuture that is completed with |
315 |
* the result of the given function of this CompletableFuture. |
316 |
* If this CompletableFuture completes exceptionally, |
317 |
* then the returned CompletableFuture also does so, |
318 |
* with a RuntimeException having this exception as |
319 |
* its cause. |
320 |
* |
321 |
* @param fn the function to use to compute the value of |
322 |
* the returned CompletableFuture |
323 |
* @return the new CompletableFuture |
324 |
*/ |
325 |
public <U> CompletableFuture<U> thenApply(Function<? super T,? extends U> fn) { |
326 |
return thenFunction(fn, null); |
327 |
} |
328 |
|
329 |
/** |
330 |
* Creates and returns a CompletableFuture that is asynchronously |
331 |
* completed using the {@link ForkJoinPool#commonPool()} with the |
332 |
* result of the given function of this CompletableFuture. If |
333 |
* this CompletableFuture completes exceptionally, then the |
334 |
* returned CompletableFuture also does so, with a |
335 |
* RuntimeException having this exception as its cause. |
336 |
* |
337 |
* @param fn the function to use to compute the value of |
338 |
* the returned CompletableFuture |
339 |
* @return the new CompletableFuture |
340 |
*/ |
341 |
public <U> CompletableFuture<U> thenApplyAsync(Function<? super T,? extends U> fn) { |
342 |
return thenFunction(fn, ForkJoinPool.commonPool()); |
343 |
} |
344 |
|
345 |
/** |
346 |
* Creates and returns a CompletableFuture that is asynchronously |
347 |
* completed using the given executor with the result of the given |
348 |
* function of this CompletableFuture. If this CompletableFuture |
349 |
* completes exceptionally, then the returned CompletableFuture |
350 |
* also does so, with a RuntimeException having this exception as |
351 |
* its cause. |
352 |
* |
353 |
* @param fn the function to use to compute the value of |
354 |
* the returned CompletableFuture |
355 |
* @param executor the executor to use for asynchronous execution |
356 |
* @return the new CompletableFuture |
357 |
*/ |
358 |
public <U> CompletableFuture<U> thenApplyAsync(Function<? super T,? extends U> fn, |
359 |
Executor executor) { |
360 |
if (executor == null) throw new NullPointerException(); |
361 |
return thenFunction(fn, executor); |
362 |
} |
363 |
|
364 |
/** |
365 |
* Creates and returns a CompletableFuture that is completed after |
366 |
* performing the given action with this CompletableFuture's |
367 |
* result when it completes. If this CompletableFuture |
368 |
* completes exceptionally, then the returned CompletableFuture |
369 |
* also does so, with a RuntimeException having this exception as |
370 |
* its cause. |
371 |
* |
372 |
* @param block the action to perform before completing the |
373 |
* returned CompletableFuture |
374 |
* @return the new CompletableFuture |
375 |
*/ |
376 |
public CompletableFuture<Void> thenAccept(Block<? super T> block) { |
377 |
return thenBlock(block, null); |
378 |
} |
379 |
|
380 |
/** |
381 |
* Creates and returns a CompletableFuture that is asynchronously |
382 |
* completed using the {@link ForkJoinPool#commonPool()} with this |
383 |
* CompletableFuture's result when it completes. If this |
384 |
* CompletableFuture completes exceptionally, then the returned |
385 |
* CompletableFuture also does so, with a RuntimeException having |
386 |
* this exception as its cause. |
387 |
* |
388 |
* @param block the action to perform before completing the |
389 |
* returned CompletableFuture |
390 |
* @return the new CompletableFuture |
391 |
*/ |
392 |
public CompletableFuture<Void> thenAcceptAsync(Block<? super T> block) { |
393 |
return thenBlock(block, ForkJoinPool.commonPool()); |
394 |
} |
395 |
|
396 |
/** |
397 |
* Creates and returns a CompletableFuture that is asynchronously |
398 |
* completed using the given executor with this |
399 |
* CompletableFuture's result when it completes. If this |
400 |
* CompletableFuture completes exceptionally, then the returned |
401 |
* CompletableFuture also does so, with a RuntimeException having |
402 |
* this exception as its cause. |
403 |
* |
404 |
* @param block the action to perform before completing the |
405 |
* returned CompletableFuture |
406 |
* @param executor the executor to use for asynchronous execution |
407 |
* @return the new CompletableFuture |
408 |
*/ |
409 |
public CompletableFuture<Void> thenAcceptAsync(Block<? super T> block, |
410 |
Executor executor) { |
411 |
if (executor == null) throw new NullPointerException(); |
412 |
return thenBlock(block, executor); |
413 |
} |
414 |
|
415 |
/** |
416 |
* Creates and returns a CompletableFuture that is completed after |
417 |
* performing the given action when this CompletableFuture |
418 |
* completes. If this CompletableFuture completes exceptionally, |
419 |
* then the returned CompletableFuture also does so, with a |
420 |
* RuntimeException having this exception as its cause. |
421 |
* |
422 |
* @param action the action to perform before completing the |
423 |
* returned CompletableFuture |
424 |
* @return the new CompletableFuture |
425 |
*/ |
426 |
public CompletableFuture<Void> thenRun(Runnable action) { |
427 |
return thenRunnable(action, null); |
428 |
} |
429 |
|
430 |
/** |
431 |
* Creates and returns a CompletableFuture that is asynchronously |
432 |
* completed using the {@link ForkJoinPool#commonPool()} after |
433 |
* performing the given action when this CompletableFuture |
434 |
* completes. If this CompletableFuture completes exceptionally, |
435 |
* then the returned CompletableFuture also does so, with a |
436 |
* RuntimeException having this exception as its cause. |
437 |
* |
438 |
* @param action the action to perform before completing the |
439 |
* returned CompletableFuture |
440 |
* @return the new CompletableFuture |
441 |
*/ |
442 |
public CompletableFuture<Void> thenRunAsync(Runnable action) { |
443 |
return thenRunnable(action, ForkJoinPool.commonPool()); |
444 |
} |
445 |
|
446 |
/** |
447 |
* Creates and returns a CompletableFuture that is asynchronously |
448 |
* completed using the given executor after performing the given |
449 |
* action when this CompletableFuture completes. If this |
450 |
* CompletableFuture completes exceptionally, then the returned |
451 |
* CompletableFuture also does so, with a RuntimeException having |
452 |
* this exception as its cause. |
453 |
* |
454 |
* @param action the action to perform before completing the |
455 |
* returned CompletableFuture |
456 |
* @param executor the executor to use for asynchronous execution |
457 |
* @return the new CompletableFuture |
458 |
*/ |
459 |
public CompletableFuture<Void> thenRunAsync(Runnable action, |
460 |
Executor executor) { |
461 |
if (executor == null) throw new NullPointerException(); |
462 |
return thenRunnable(action, executor); |
463 |
} |
464 |
|
465 |
/** |
466 |
* Creates and returns a CompletableFuture that is completed with |
467 |
* the result of the given function of this and the other given |
468 |
* CompletableFuture's results when both complete. If this or |
469 |
* the other CompletableFuture complete exceptionally, then the |
470 |
* returned CompletableFuture also does so, with a |
471 |
* RuntimeException having the exception as its cause. |
472 |
* |
473 |
* @param other the other CompletableFuture |
474 |
* @param fn the function to use to compute the value of |
475 |
* the returned CompletableFuture |
476 |
* @return the new CompletableFuture |
477 |
*/ |
478 |
public <U,V> CompletableFuture<V> thenApply(CompletableFuture<? extends U> other, |
479 |
BiFunction<? super T,? super U,? extends V> fn) { |
480 |
return andFunction(other, fn, null); |
481 |
} |
482 |
|
483 |
/** |
484 |
* Creates and returns a CompletableFuture that is asynchronously |
485 |
* completed using the {@link ForkJoinPool#commonPool()} with |
486 |
* the result of the given function of this and the other given |
487 |
* CompletableFuture's results when both complete. If this or |
488 |
* the other CompletableFuture complete exceptionally, then the |
489 |
* returned CompletableFuture also does so, with a |
490 |
* RuntimeException having the exception as its cause. |
491 |
* |
492 |
* @param other the other CompletableFuture |
493 |
* @param fn the function to use to compute the value of |
494 |
* the returned CompletableFuture |
495 |
* @return the new CompletableFuture |
496 |
*/ |
497 |
public <U,V> CompletableFuture<V> thenApplyAsync(CompletableFuture<? extends U> other, |
498 |
BiFunction<? super T,? super U,? extends V> fn) { |
499 |
return andFunction(other, fn, ForkJoinPool.commonPool()); |
500 |
} |
501 |
|
502 |
/** |
503 |
* Creates and returns a CompletableFuture that is |
504 |
* asynchronously completed using the given executor with the |
505 |
* result of the given function of this and the other given |
506 |
* CompletableFuture's results when both complete. If this or |
507 |
* the other CompletableFuture complete exceptionally, then the |
508 |
* returned CompletableFuture also does so, with a |
509 |
* RuntimeException having the exception as its cause. |
510 |
* |
511 |
* @param other the other CompletableFuture |
512 |
* @param fn the function to use to compute the value of |
513 |
* the returned CompletableFuture |
514 |
* @param executor the executor to use for asynchronous execution |
515 |
* @return the new CompletableFuture |
516 |
*/ |
517 |
|
518 |
public <U,V> CompletableFuture<V> thenApplyAsync(CompletableFuture<? extends U> other, |
519 |
BiFunction<? super T,? super U,? extends V> fn, |
520 |
Executor executor) { |
521 |
if (executor == null) throw new NullPointerException(); |
522 |
return andFunction(other, fn, executor); |
523 |
} |
524 |
|
525 |
/** |
526 |
* Creates and returns a CompletableFuture that is completed with |
527 |
* the results of this and the other given CompletableFuture if |
528 |
* both complete. If this and/or the other CompletableFuture |
529 |
* complete exceptionally, then the returned CompletableFuture |
530 |
* also does so, with a RuntimeException having the one of the |
531 |
* exceptions as its cause. |
532 |
* |
533 |
* @param other the other CompletableFuture |
534 |
* @param block the action to perform before completing the |
535 |
* returned CompletableFuture |
536 |
* @return the new CompletableFuture |
537 |
*/ |
538 |
public <U> CompletableFuture<Void> thenAccept(CompletableFuture<? extends U> other, |
539 |
BiBlock<? super T, ? super U> block) { |
540 |
return andBlock(other, block, null); |
541 |
} |
542 |
|
543 |
/** |
544 |
* Creates and returns a CompletableFuture that is completed |
545 |
* asynchronously using the {@link ForkJoinPool#commonPool()} with |
546 |
* the results of this and the other given CompletableFuture when |
547 |
* both complete. If this and/or the other CompletableFuture |
548 |
* complete exceptionally, then the returned CompletableFuture |
549 |
* also does so, with a RuntimeException having the one of the |
550 |
* exceptions as its cause. |
551 |
* |
552 |
* @param other the other CompletableFuture |
553 |
* @param block the action to perform before completing the |
554 |
* returned CompletableFuture |
555 |
* @return the new CompletableFuture |
556 |
*/ |
557 |
public <U> CompletableFuture<Void> thenAcceptAsync(CompletableFuture<? extends U> other, |
558 |
BiBlock<? super T, ? super U> block) { |
559 |
return andBlock(other, block, ForkJoinPool.commonPool()); |
560 |
} |
561 |
|
562 |
/** |
563 |
* Creates and returns a CompletableFuture that is completed |
564 |
* asynchronously using the given executor with the results of |
565 |
* this and the other given CompletableFuture when both complete. |
566 |
* If this and/or the other CompletableFuture complete |
567 |
* exceptionally, then the returned CompletableFuture also does |
568 |
* so, with a RuntimeException having the one of the exceptions as |
569 |
* its cause. |
570 |
* |
571 |
* @param other the other CompletableFuture |
572 |
* @param block the action to perform before completing the |
573 |
* returned CompletableFuture |
574 |
* @param executor the executor to use for asynchronous execution |
575 |
* @return the new CompletableFuture |
576 |
*/ |
577 |
public <U> CompletableFuture<Void> thenAcceptAsync(CompletableFuture<? extends U> other, |
578 |
BiBlock<? super T, ? super U> block, |
579 |
Executor executor) { |
580 |
if (executor == null) throw new NullPointerException(); |
581 |
return andBlock(other, block, executor); |
582 |
} |
583 |
|
584 |
/** |
585 |
* Creates and returns a CompletableFuture that is completed |
586 |
* when this and the other given CompletableFuture both |
587 |
* complete. If this and/or the other CompletableFuture complete |
588 |
* exceptionally, then the returned CompletableFuture also does |
589 |
* so, with a RuntimeException having the one of the exceptions as |
590 |
* its cause. |
591 |
* |
592 |
* @param other the other CompletableFuture |
593 |
* @param action the action to perform before completing the |
594 |
* returned CompletableFuture |
595 |
* @return the new CompletableFuture |
596 |
*/ |
597 |
public CompletableFuture<Void> thenRun(CompletableFuture<?> other, |
598 |
Runnable action) { |
599 |
return andRunnable(other, action, null); |
600 |
} |
601 |
|
602 |
/** |
603 |
* Creates and returns a CompletableFuture that is completed |
604 |
* asynchronously using the {@link ForkJoinPool#commonPool()} |
605 |
* when this and the other given CompletableFuture both |
606 |
* complete. If this and/or the other CompletableFuture complete |
607 |
* exceptionally, then the returned CompletableFuture also does |
608 |
* so, with a RuntimeException having the one of the exceptions as |
609 |
* its cause. |
610 |
* |
611 |
* @param other the other CompletableFuture |
612 |
* @param action the action to perform before completing the |
613 |
* returned CompletableFuture |
614 |
* @return the new CompletableFuture |
615 |
*/ |
616 |
public CompletableFuture<Void> thenRunAsync(CompletableFuture<?> other, |
617 |
Runnable action) { |
618 |
return andRunnable(other, action, ForkJoinPool.commonPool()); |
619 |
} |
620 |
|
621 |
/** |
622 |
* Creates and returns a CompletableFuture that is completed |
623 |
* asynchronously using the given executor |
624 |
* when this and the other given CompletableFuture both |
625 |
* complete. If this and/or the other CompletableFuture complete |
626 |
* exceptionally, then the returned CompletableFuture also does |
627 |
* so, with a RuntimeException having the one of the exceptions as |
628 |
* its cause. |
629 |
* |
630 |
* @param other the other CompletableFuture |
631 |
* @param action the action to perform before completing the |
632 |
* returned CompletableFuture |
633 |
* @param executor the executor to use for asynchronous execution |
634 |
* @return the new CompletableFuture |
635 |
*/ |
636 |
public CompletableFuture<Void> thenRunAsync(CompletableFuture<?> other, |
637 |
Runnable action, |
638 |
Executor executor) { |
639 |
if (executor == null) throw new NullPointerException(); |
640 |
return andRunnable(other, action, executor); |
641 |
} |
642 |
|
643 |
/** |
644 |
* Creates and returns a CompletableFuture that is completed with |
645 |
* the result of the given function of either this or the other |
646 |
* given CompletableFuture's results when either complete. If |
647 |
* this and/or the other CompletableFuture complete exceptionally, |
648 |
* then the returned CompletableFuture may also do so, with a |
649 |
* RuntimeException having one of these exceptions as its cause. |
650 |
* No guarantees are made about which result or exception is used |
651 |
* in the returned CompletableFuture. |
652 |
* |
653 |
* @param other the other CompletableFuture |
654 |
* @param fn the function to use to compute the value of |
655 |
* the returned CompletableFuture |
656 |
* @return the new CompletableFuture |
657 |
*/ |
658 |
public <U> CompletableFuture<U> orApply(CompletableFuture<? extends T> other, |
659 |
Function<? super T, U> fn) { |
660 |
return orFunction(other, fn, null); |
661 |
} |
662 |
|
663 |
/** |
664 |
* Creates and returns a CompletableFuture that is completed |
665 |
* asynchronously using the {@link ForkJoinPool#commonPool()} with |
666 |
* the result of the given function of either this or the other |
667 |
* given CompletableFuture's results when either complete. If |
668 |
* this and/or the other CompletableFuture complete exceptionally, |
669 |
* then the returned CompletableFuture may also do so, with a |
670 |
* RuntimeException having one of these exceptions as its cause. |
671 |
* No guarantees are made about which result or exception is used |
672 |
* in the returned CompletableFuture. |
673 |
* |
674 |
* @param other the other CompletableFuture |
675 |
* @param fn the function to use to compute the value of |
676 |
* the returned CompletableFuture |
677 |
* @return the new CompletableFuture |
678 |
*/ |
679 |
public <U> CompletableFuture<U> orApplyAsync(CompletableFuture<? extends T> other, |
680 |
Function<? super T, U> fn) { |
681 |
return orFunction(other, fn, ForkJoinPool.commonPool()); |
682 |
} |
683 |
|
684 |
/** |
685 |
* Creates and returns a CompletableFuture that is completed |
686 |
* asynchronously using the given executor with the result of the |
687 |
* given function of either this or the other given |
688 |
* CompletableFuture's results when either complete. If this |
689 |
* and/or the other CompletableFuture complete exceptionally, then |
690 |
* the returned CompletableFuture may also do so, with a |
691 |
* RuntimeException having one of these exceptions as its cause. |
692 |
* No guarantees are made about which result or exception is used |
693 |
* in the returned CompletableFuture. |
694 |
* |
695 |
* @param other the other CompletableFuture |
696 |
* @param fn the function to use to compute the value of |
697 |
* the returned CompletableFuture |
698 |
* @param executor the executor to use for asynchronous execution |
699 |
* @return the new CompletableFuture |
700 |
*/ |
701 |
public <U> CompletableFuture<U> orApplyAsync(CompletableFuture<? extends T> other, |
702 |
Function<? super T, U> fn, |
703 |
Executor executor) { |
704 |
if (executor == null) throw new NullPointerException(); |
705 |
return orFunction(other, fn, executor); |
706 |
} |
707 |
|
708 |
/** |
709 |
* Creates and returns a CompletableFuture that is completed after |
710 |
* performing the given action with the result of either this or the |
711 |
* other given CompletableFuture's result, when either complete. |
712 |
* If this and/or the other CompletableFuture complete |
713 |
* exceptionally, then the returned CompletableFuture may also do |
714 |
* so, with a RuntimeException having one of these exceptions as |
715 |
* its cause. No guarantees are made about which exception is |
716 |
* used in the returned CompletableFuture. |
717 |
* |
718 |
* @param other the other CompletableFuture |
719 |
* @param block the action to perform before completing the |
720 |
* returned CompletableFuture |
721 |
* @return the new CompletableFuture |
722 |
*/ |
723 |
public CompletableFuture<Void> orAccept(CompletableFuture<? extends T> other, |
724 |
Block<? super T> block) { |
725 |
return orBlock(other, block, null); |
726 |
} |
727 |
|
728 |
/** |
729 |
* Creates and returns a CompletableFuture that is completed |
730 |
* asynchronously using the {@link ForkJoinPool#commonPool()}, |
731 |
* performing the given action with the result of either this or |
732 |
* the other given CompletableFuture's result, when either |
733 |
* complete. If this and/or the other CompletableFuture complete |
734 |
* exceptionally, then the returned CompletableFuture may also do |
735 |
* so, with a RuntimeException having one of these exceptions as |
736 |
* its cause. No guarantees are made about which exception is |
737 |
* used in the returned CompletableFuture. |
738 |
* |
739 |
* @param other the other CompletableFuture |
740 |
* @param block the action to perform before completing the |
741 |
* returned CompletableFuture |
742 |
* @return the new CompletableFuture |
743 |
*/ |
744 |
public CompletableFuture<Void> orAcceptAsync(CompletableFuture<? extends T> other, |
745 |
Block<? super T> block) { |
746 |
return orBlock(other, block, ForkJoinPool.commonPool()); |
747 |
} |
748 |
|
749 |
/** |
750 |
* Creates and returns a CompletableFuture that is completed |
751 |
* asynchronously using the given executor, |
752 |
* performing the given action with the result of either this or |
753 |
* the other given CompletableFuture's result, when either |
754 |
* complete. If this and/or the other CompletableFuture complete |
755 |
* exceptionally, then the returned CompletableFuture may also do |
756 |
* so, with a RuntimeException having one of these exceptions as |
757 |
* its cause. No guarantees are made about which exception is |
758 |
* used in the returned CompletableFuture. |
759 |
* |
760 |
* @param other the other CompletableFuture |
761 |
* @param block the action to perform before completing the |
762 |
* returned CompletableFuture |
763 |
* @param executor the executor to use for asynchronous execution |
764 |
* @return the new CompletableFuture |
765 |
*/ |
766 |
public CompletableFuture<Void> orRunAsync(CompletableFuture<? extends T> other, |
767 |
Block<? super T> block, |
768 |
Executor executor) { |
769 |
if (executor == null) throw new NullPointerException(); |
770 |
return orBlock(other, block, executor); |
771 |
} |
772 |
|
773 |
/** |
774 |
* Creates and returns a CompletableFuture that is completed |
775 |
* after this or the other given CompletableFuture complete. If |
776 |
* this and/or the other CompletableFuture complete exceptionally, |
777 |
* then the returned CompletableFuture may also do so, with a |
778 |
* RuntimeException having one of these exceptions as its cause. |
779 |
* No guarantees are made about which exception is used in the |
780 |
* returned CompletableFuture. |
781 |
* |
782 |
* @param other the other CompletableFuture |
783 |
* @param action the action to perform before completing the |
784 |
* returned CompletableFuture |
785 |
* @return the new CompletableFuture |
786 |
*/ |
787 |
public CompletableFuture<Void> orRun(CompletableFuture<?> other, |
788 |
Runnable action) { |
789 |
return orRunnable(other, action, null); |
790 |
} |
791 |
|
792 |
/** |
793 |
* Creates and returns a CompletableFuture that is completed |
794 |
* asynchronously using the {@link ForkJoinPool#commonPool()} |
795 |
* after this or the other given CompletableFuture complete. If |
796 |
* this and/or the other CompletableFuture complete exceptionally, |
797 |
* then the returned CompletableFuture may also do so, with a |
798 |
* RuntimeException having one of these exceptions as its cause. |
799 |
* No guarantees are made about which exception is used in the |
800 |
* returned CompletableFuture. |
801 |
* |
802 |
* @param other the other CompletableFuture |
803 |
* @param action the action to perform before completing the |
804 |
* returned CompletableFuture |
805 |
* @return the new CompletableFuture |
806 |
*/ |
807 |
public CompletableFuture<Void> orRunAsync(CompletableFuture<?> other, |
808 |
Runnable action) { |
809 |
return orRunnable(other, action, ForkJoinPool.commonPool()); |
810 |
} |
811 |
|
812 |
/** |
813 |
* Creates and returns a CompletableFuture that is completed |
814 |
* asynchronously using the given executor after this or the other |
815 |
* given CompletableFuture complete. If this and/or the other |
816 |
* CompletableFuture complete exceptionally, then the returned |
817 |
* CompletableFuture may also do so, with a RuntimeException |
818 |
* having one of these exceptions as its cause. No guarantees are |
819 |
* made about which exception is used in the returned |
820 |
* CompletableFuture. |
821 |
* |
822 |
* @param other the other CompletableFuture |
823 |
* @param action the action to perform before completing the |
824 |
* returned CompletableFuture |
825 |
* @param executor the executor to use for asynchronous execution |
826 |
* @return the new CompletableFuture |
827 |
*/ |
828 |
public CompletableFuture<Void> orRunAsync(CompletableFuture<?> other, |
829 |
Runnable action, |
830 |
Executor executor) { |
831 |
if (executor == null) throw new NullPointerException(); |
832 |
return orRunnable(other, action, executor); |
833 |
} |
834 |
|
835 |
/** |
836 |
* Creates and returns a CompletableFuture that is completed with |
837 |
* the result of the given function of the exception triggering |
838 |
* this CompletableFuture's completion when it completes |
839 |
* exceptionally; Otherwise, if this CompletableFuture completes |
840 |
* normally, then the returned CompletableFuture also completes |
841 |
* normally with the same value. |
842 |
* |
843 |
* @param fn the function to use to compute the value of the |
844 |
* returned CompletableFuture if this CompletableFuture completed |
845 |
* exceptionally |
846 |
* @return the new CompletableFuture |
847 |
*/ |
848 |
public CompletableFuture<T> exceptionally(Function<Throwable, ? extends T> fn) { |
849 |
if (fn == null) throw new NullPointerException(); |
850 |
CompletableFuture<T> dst = new CompletableFuture<T>(); |
851 |
ExceptionAction<T> d = null; |
852 |
Object r; |
853 |
if ((r = result) == null) { |
854 |
CompletionNode p = |
855 |
new CompletionNode(d = new ExceptionAction<T>(this, fn, dst)); |
856 |
while ((r = result) == null) { |
857 |
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, |
858 |
p.next = completions, p)) |
859 |
break; |
860 |
} |
861 |
} |
862 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
863 |
T t; Throwable ex = null; |
864 |
if (r instanceof AltResult) { |
865 |
if ((ex = ((AltResult)r).ex) != null) { |
866 |
try { |
867 |
dst.complete(fn.apply(ex)); |
868 |
} catch (Throwable rex) { |
869 |
dst.completeExceptionally(rex); |
870 |
} |
871 |
} |
872 |
t = null; |
873 |
} |
874 |
else |
875 |
t = (T) r; |
876 |
if (ex == null) |
877 |
dst.complete(t); |
878 |
} |
879 |
if (r != null) |
880 |
postComplete(); |
881 |
return dst; |
882 |
} |
883 |
|
884 |
/** |
885 |
* Attempts to complete this CompletableFuture with |
886 |
* a {@link CancellationException}. |
887 |
* |
888 |
* @param mayInterruptIfRunning this value has no effect in this |
889 |
* implementation because interrupts are not used to control |
890 |
* processing. |
891 |
* |
892 |
* @return {@code true} if this task is now cancelled |
893 |
*/ |
894 |
public boolean cancel(boolean mayInterruptIfRunning) { |
895 |
Object r; |
896 |
while ((r = result) == null) { |
897 |
r = new AltResult(new CancellationException()); |
898 |
if (UNSAFE.compareAndSwapObject(this, RESULT, null, r)) { |
899 |
postComplete(); |
900 |
return true; |
901 |
} |
902 |
} |
903 |
return ((r instanceof AltResult) && |
904 |
(((AltResult)r).ex instanceof CancellationException)); |
905 |
} |
906 |
|
907 |
/** |
908 |
* Returns {@code true} if this CompletableFuture was cancelled |
909 |
* before it completed normally. |
910 |
* |
911 |
* @return {@code true} if this CompletableFuture was cancelled |
912 |
* before it completed normally |
913 |
*/ |
914 |
public boolean isCancelled() { |
915 |
Object r; |
916 |
return ((r = result) != null && |
917 |
(r instanceof AltResult) && |
918 |
(((AltResult)r).ex instanceof CancellationException)); |
919 |
} |
920 |
|
921 |
/** |
922 |
* Forcibly sets or resets the value subsequently returned by |
923 |
* method get() and related methods, whether or not already |
924 |
* completed. This method is designed for use only in error |
925 |
* recovery actions, and even in such situations may result in |
926 |
* ongoing dependent completions using established versus |
927 |
* overwritten values. |
928 |
* |
929 |
* @param value the completion value |
930 |
*/ |
931 |
public void obtrudeValue(T value) { |
932 |
result = (value == null) ? NIL : value; |
933 |
postComplete(); |
934 |
} |
935 |
|
936 |
/** |
937 |
* Removes and signals all waiting threads and runs all completions. |
938 |
*/ |
939 |
private void postComplete() { |
940 |
WaitNode q; Thread t; |
941 |
while ((q = waiters) != null) { |
942 |
if (UNSAFE.compareAndSwapObject(this, WAITERS, q, q.next) && |
943 |
(t = q.thread) != null) { |
944 |
q.thread = null; |
945 |
LockSupport.unpark(t); |
946 |
} |
947 |
} |
948 |
|
949 |
CompletionNode h; Completion c; |
950 |
while ((h = completions) != null) { |
951 |
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, h, h.next) && |
952 |
(c = h.completion) != null) |
953 |
c.run(); |
954 |
} |
955 |
} |
956 |
|
957 |
/* ------------- waiting for completions -------------- */ |
958 |
|
959 |
/** |
960 |
* Heuristic spin value for waitingGet() before blocking on |
961 |
* multiprocessors |
962 |
*/ |
963 |
static final int WAITING_GET_SPINS = 256; |
964 |
|
965 |
/** |
966 |
* Returns result after waiting. |
967 |
*/ |
968 |
private T waitingGet() { |
969 |
WaitNode q = null; |
970 |
boolean queued = false, interrupted = false; |
971 |
int h = 0, spins = 0; |
972 |
for (Object r;;) { |
973 |
if ((r = result) != null) { |
974 |
Throwable ex; |
975 |
if (q != null) // suppress unpark |
976 |
q.thread = null; |
977 |
postComplete(); // help release others |
978 |
if (interrupted) |
979 |
Thread.currentThread().interrupt(); |
980 |
if (r instanceof AltResult) { |
981 |
if ((ex = ((AltResult)r).ex) != null) { |
982 |
if (ex instanceof Error) |
983 |
throw (Error)ex; |
984 |
if (ex instanceof RuntimeException) |
985 |
throw (RuntimeException)ex; |
986 |
throw new RuntimeException(ex); |
987 |
} |
988 |
return null; |
989 |
} |
990 |
return (T)r; |
991 |
} |
992 |
else if (h == 0) { |
993 |
h = ThreadLocalRandom.current().nextInt(); |
994 |
if (Runtime.getRuntime().availableProcessors() > 1) |
995 |
spins = WAITING_GET_SPINS; |
996 |
} |
997 |
else if (spins > 0) { |
998 |
h ^= h << 1; // xorshift |
999 |
h ^= h >>> 3; |
1000 |
if ((h ^= h << 10) >= 0) |
1001 |
--spins; |
1002 |
} |
1003 |
else if (q == null) |
1004 |
q = new WaitNode(); |
1005 |
else if (!queued) |
1006 |
queued = UNSAFE.compareAndSwapObject(this, WAITERS, |
1007 |
q.next = waiters, q); |
1008 |
else if (Thread.interrupted()) |
1009 |
interrupted = true; |
1010 |
else if (q.thread == null) |
1011 |
q.thread = Thread.currentThread(); |
1012 |
else |
1013 |
LockSupport.park(this); |
1014 |
} |
1015 |
} |
1016 |
|
1017 |
/** |
1018 |
* Awaits completion or aborts on interrupt or timeout. |
1019 |
* |
1020 |
* @param nanos time to wait |
1021 |
* @return raw result |
1022 |
*/ |
1023 |
private Object timedAwaitDone(long nanos) |
1024 |
throws InterruptedException, TimeoutException { |
1025 |
final long deadline = System.nanoTime() + nanos; |
1026 |
WaitNode q = null; |
1027 |
boolean queued = false; |
1028 |
for (Object r;;) { |
1029 |
if (Thread.interrupted()) { |
1030 |
removeWaiter(q); |
1031 |
throw new InterruptedException(); |
1032 |
} |
1033 |
else if ((r = result) != null) { |
1034 |
if (q != null) |
1035 |
q.thread = null; |
1036 |
postComplete(); |
1037 |
return r; |
1038 |
} |
1039 |
else if (q == null) |
1040 |
q = new WaitNode(); |
1041 |
else if (!queued) |
1042 |
queued = UNSAFE.compareAndSwapObject(this, WAITERS, |
1043 |
q.next = waiters, q); |
1044 |
else if ((nanos = deadline - System.nanoTime()) <= 0L) { |
1045 |
removeWaiter(q); |
1046 |
throw new TimeoutException(); |
1047 |
} |
1048 |
else if (q.thread == null) |
1049 |
q.thread = Thread.currentThread(); |
1050 |
else |
1051 |
LockSupport.parkNanos(this, nanos); |
1052 |
} |
1053 |
} |
1054 |
|
1055 |
/** |
1056 |
* Tries to unlink a timed-out or interrupted wait node to avoid |
1057 |
* accumulating garbage. Internal nodes are simply unspliced |
1058 |
* without CAS since it is harmless if they are traversed anyway |
1059 |
* by releasers. To avoid effects of unsplicing from already |
1060 |
* removed nodes, the list is retraversed in case of an apparent |
1061 |
* race. This is slow when there are a lot of nodes, but we don't |
1062 |
* expect lists to be long enough to outweigh higher-overhead |
1063 |
* schemes. |
1064 |
*/ |
1065 |
private void removeWaiter(WaitNode node) { |
1066 |
if (node != null) { |
1067 |
node.thread = null; |
1068 |
retry: |
1069 |
for (;;) { // restart on removeWaiter race |
1070 |
for (WaitNode pred = null, q = waiters, s; q != null; q = s) { |
1071 |
s = q.next; |
1072 |
if (q.thread != null) |
1073 |
pred = q; |
1074 |
else if (pred != null) { |
1075 |
pred.next = s; |
1076 |
if (pred.thread == null) // check for race |
1077 |
continue retry; |
1078 |
} |
1079 |
else if (!UNSAFE.compareAndSwapObject(this, WAITERS, q, s)) |
1080 |
continue retry; |
1081 |
} |
1082 |
break; |
1083 |
} |
1084 |
} |
1085 |
} |
1086 |
|
1087 |
/* ------------- Async tasks -------------- */ |
1088 |
|
1089 |
/** Base class can act as either FJ or plain Runnable */ |
1090 |
static abstract class Async extends ForkJoinTask<Void> implements Runnable { |
1091 |
public final Void getRawResult() { return null; } |
1092 |
public final void setRawResult(Void v) { } |
1093 |
public final void run() { exec(); } |
1094 |
} |
1095 |
|
1096 |
static final class AsyncRunnable extends Async { |
1097 |
final Runnable runnable; |
1098 |
final CompletableFuture<Void> dst; |
1099 |
AsyncRunnable(Runnable runnable, CompletableFuture<Void> dst) { |
1100 |
this.runnable = runnable; this.dst = dst; |
1101 |
} |
1102 |
public final boolean exec() { |
1103 |
Runnable fn; |
1104 |
CompletableFuture<Void> d; |
1105 |
if ((fn = this.runnable) == null || (d = this.dst) == null) |
1106 |
throw new NullPointerException(); |
1107 |
try { |
1108 |
fn.run(); |
1109 |
d.complete(null); |
1110 |
} catch (Throwable ex) { |
1111 |
d.completeExceptionally(ex); |
1112 |
} |
1113 |
return true; |
1114 |
} |
1115 |
private static final long serialVersionUID = 5232453952276885070L; |
1116 |
} |
1117 |
|
1118 |
static final class AsyncSupplier<U> extends Async { |
1119 |
final Supplier<U> supplier; |
1120 |
final CompletableFuture<U> dst; |
1121 |
AsyncSupplier(Supplier<U> supplier, CompletableFuture<U> dst) { |
1122 |
this.supplier = supplier; this.dst = dst; |
1123 |
} |
1124 |
public final boolean exec() { |
1125 |
Supplier<U> fn; |
1126 |
CompletableFuture<U> d; |
1127 |
if ((fn = this.supplier) == null || (d = this.dst) == null) |
1128 |
throw new NullPointerException(); |
1129 |
try { |
1130 |
d.complete(fn.get()); |
1131 |
} catch (Throwable ex) { |
1132 |
d.completeExceptionally(ex); |
1133 |
} |
1134 |
return true; |
1135 |
} |
1136 |
private static final long serialVersionUID = 5232453952276885070L; |
1137 |
} |
1138 |
|
1139 |
static final class AsyncFunction<T,U> extends Async { |
1140 |
Function<? super T,? extends U> fn; |
1141 |
T arg; |
1142 |
final CompletableFuture<U> dst; |
1143 |
AsyncFunction(T arg, Function<? super T,? extends U> fn, |
1144 |
CompletableFuture<U> dst) { |
1145 |
this.arg = arg; this.fn = fn; this.dst = dst; |
1146 |
} |
1147 |
public final boolean exec() { |
1148 |
Function<? super T,? extends U> fn; |
1149 |
CompletableFuture<U> d; |
1150 |
if ((fn = this.fn) == null || (d = this.dst) == null) |
1151 |
throw new NullPointerException(); |
1152 |
try { |
1153 |
d.complete(fn.apply(arg)); |
1154 |
} catch (Throwable ex) { |
1155 |
d.completeExceptionally(ex); |
1156 |
} |
1157 |
return true; |
1158 |
} |
1159 |
private static final long serialVersionUID = 5232453952276885070L; |
1160 |
} |
1161 |
|
1162 |
static final class AsyncBiFunction<T,U,V> extends Async { |
1163 |
final BiFunction<? super T,? super U,? extends V> fn; |
1164 |
final T arg1; |
1165 |
final U arg2; |
1166 |
final CompletableFuture<V> dst; |
1167 |
AsyncBiFunction(T arg1, U arg2, |
1168 |
BiFunction<? super T,? super U,? extends V> fn, |
1169 |
CompletableFuture<V> dst) { |
1170 |
this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; this.dst = dst; |
1171 |
} |
1172 |
public final boolean exec() { |
1173 |
BiFunction<? super T,? super U,? extends V> fn; |
1174 |
CompletableFuture<V> d; |
1175 |
if ((fn = this.fn) == null || (d = this.dst) == null) |
1176 |
throw new NullPointerException(); |
1177 |
try { |
1178 |
d.complete(fn.apply(arg1, arg2)); |
1179 |
} catch (Throwable ex) { |
1180 |
d.completeExceptionally(ex); |
1181 |
} |
1182 |
return true; |
1183 |
} |
1184 |
private static final long serialVersionUID = 5232453952276885070L; |
1185 |
} |
1186 |
|
1187 |
static final class AsyncBlock<T> extends Async { |
1188 |
Block<? super T> fn; |
1189 |
T arg; |
1190 |
final CompletableFuture<Void> dst; |
1191 |
AsyncBlock(T arg, Block<? super T> fn, |
1192 |
CompletableFuture<Void> dst) { |
1193 |
this.arg = arg; this.fn = fn; this.dst = dst; |
1194 |
} |
1195 |
public final boolean exec() { |
1196 |
Block<? super T> fn; |
1197 |
CompletableFuture<Void> d; |
1198 |
if ((fn = this.fn) == null || (d = this.dst) == null) |
1199 |
throw new NullPointerException(); |
1200 |
try { |
1201 |
fn.accept(arg); |
1202 |
d.complete(null); |
1203 |
} catch (Throwable ex) { |
1204 |
d.completeExceptionally(ex); |
1205 |
} |
1206 |
return true; |
1207 |
} |
1208 |
private static final long serialVersionUID = 5232453952276885070L; |
1209 |
} |
1210 |
|
1211 |
static final class AsyncBiBlock<T,U> extends Async { |
1212 |
final BiBlock<? super T,? super U> fn; |
1213 |
final T arg1; |
1214 |
final U arg2; |
1215 |
final CompletableFuture<Void> dst; |
1216 |
AsyncBiBlock(T arg1, U arg2, |
1217 |
BiBlock<? super T,? super U> fn, |
1218 |
CompletableFuture<Void> dst) { |
1219 |
this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; this.dst = dst; |
1220 |
} |
1221 |
public final boolean exec() { |
1222 |
BiBlock<? super T,? super U> fn; |
1223 |
CompletableFuture<Void> d; |
1224 |
if ((fn = this.fn) == null || (d = this.dst) == null) |
1225 |
throw new NullPointerException(); |
1226 |
try { |
1227 |
fn.accept(arg1, arg2); |
1228 |
d.complete(null); |
1229 |
} catch (Throwable ex) { |
1230 |
d.completeExceptionally(ex); |
1231 |
} |
1232 |
return true; |
1233 |
} |
1234 |
private static final long serialVersionUID = 5232453952276885070L; |
1235 |
} |
1236 |
|
1237 |
/* ------------- Completions -------------- */ |
1238 |
|
1239 |
// Opportunistically subclass AtomicInteger to use compareAndSet to claim. |
1240 |
static abstract class Completion extends AtomicInteger implements Runnable { |
1241 |
} |
1242 |
|
1243 |
static final class ThenFunction<T,U> extends Completion { |
1244 |
final CompletableFuture<? extends T> src; |
1245 |
final Function<? super T,? extends U> fn; |
1246 |
final CompletableFuture<U> dst; |
1247 |
final Executor executor; |
1248 |
ThenFunction(CompletableFuture<? extends T> src, |
1249 |
final Function<? super T,? extends U> fn, |
1250 |
final CompletableFuture<U> dst, Executor executor) { |
1251 |
this.src = src; this.fn = fn; this.dst = dst; |
1252 |
this.executor = executor; |
1253 |
} |
1254 |
public void run() { |
1255 |
CompletableFuture<? extends T> a; |
1256 |
Function<? super T,? extends U> fn; |
1257 |
CompletableFuture<U> dst; |
1258 |
Object r; T t; Throwable ex; |
1259 |
if ((dst = this.dst) != null && |
1260 |
(fn = this.fn) != null && |
1261 |
(a = this.src) != null && |
1262 |
(r = a.result) != null && |
1263 |
compareAndSet(0, 1)) { |
1264 |
if (r instanceof AltResult) { |
1265 |
if ((ex = ((AltResult)r).ex) != null) { |
1266 |
dst.completeExceptionally(new RuntimeException(ex)); |
1267 |
return; |
1268 |
} |
1269 |
t = null; |
1270 |
} |
1271 |
else |
1272 |
t = (T) r; |
1273 |
try { |
1274 |
if (executor != null) |
1275 |
executor.execute(new AsyncFunction<T,U>(t, fn, dst)); |
1276 |
else |
1277 |
dst.complete(fn.apply(t)); |
1278 |
} catch (Throwable rex) { |
1279 |
dst.completeExceptionally(rex); |
1280 |
} |
1281 |
} |
1282 |
} |
1283 |
} |
1284 |
|
1285 |
static final class ThenBlock<T> extends Completion { |
1286 |
final CompletableFuture<? extends T> src; |
1287 |
final Block<? super T> fn; |
1288 |
final CompletableFuture<Void> dst; |
1289 |
final Executor executor; |
1290 |
ThenBlock(CompletableFuture<? extends T> src, |
1291 |
final Block<? super T> fn, |
1292 |
final CompletableFuture<Void> dst, Executor executor) { |
1293 |
this.src = src; this.fn = fn; this.dst = dst; |
1294 |
this.executor = executor; |
1295 |
} |
1296 |
public void run() { |
1297 |
CompletableFuture<? extends T> a; |
1298 |
Block<? super T> fn; |
1299 |
CompletableFuture<Void> dst; |
1300 |
Object r; T t; Throwable ex; |
1301 |
if ((dst = this.dst) != null && |
1302 |
(fn = this.fn) != null && |
1303 |
(a = this.src) != null && |
1304 |
(r = a.result) != null && |
1305 |
compareAndSet(0, 1)) { |
1306 |
if (r instanceof AltResult) { |
1307 |
if ((ex = ((AltResult)r).ex) != null) { |
1308 |
dst.completeExceptionally(new RuntimeException(ex)); |
1309 |
return; |
1310 |
} |
1311 |
t = null; |
1312 |
} |
1313 |
else |
1314 |
t = (T) r; |
1315 |
try { |
1316 |
if (executor != null) |
1317 |
executor.execute(new AsyncBlock<T>(t, fn, dst)); |
1318 |
else { |
1319 |
fn.accept(t); |
1320 |
dst.complete(null); |
1321 |
} |
1322 |
} catch (Throwable rex) { |
1323 |
dst.completeExceptionally(rex); |
1324 |
} |
1325 |
} |
1326 |
} |
1327 |
} |
1328 |
|
1329 |
static final class ThenRunnable<T> extends Completion { |
1330 |
final CompletableFuture<? extends T> src; |
1331 |
final Runnable fn; |
1332 |
final CompletableFuture<Void> dst; |
1333 |
final Executor executor; |
1334 |
ThenRunnable(CompletableFuture<? extends T> src, |
1335 |
Runnable fn, |
1336 |
CompletableFuture<Void> dst, |
1337 |
Executor executor) { |
1338 |
this.src = src; this.fn = fn; this.dst = dst; |
1339 |
this.executor = executor; |
1340 |
} |
1341 |
public void run() { |
1342 |
CompletableFuture<? extends T> a; |
1343 |
Runnable fn; |
1344 |
CompletableFuture<Void> dst; |
1345 |
Object r; Throwable ex; |
1346 |
if ((dst = this.dst) != null && |
1347 |
(fn = this.fn) != null && |
1348 |
(a = this.src) != null && |
1349 |
(r = a.result) != null && |
1350 |
compareAndSet(0, 1)) { |
1351 |
if (r instanceof AltResult) { |
1352 |
if ((ex = ((AltResult)r).ex) != null) { |
1353 |
dst.completeExceptionally(new RuntimeException(ex)); |
1354 |
return; |
1355 |
} |
1356 |
} |
1357 |
try { |
1358 |
if (executor != null) |
1359 |
executor.execute(new AsyncRunnable(fn, dst)); |
1360 |
else { |
1361 |
fn.run(); |
1362 |
dst.complete(null); |
1363 |
} |
1364 |
} catch (Throwable rex) { |
1365 |
dst.completeExceptionally(rex); |
1366 |
} |
1367 |
} |
1368 |
} |
1369 |
} |
1370 |
|
1371 |
static final class AndFunction<T,U,V> extends Completion { |
1372 |
final CompletableFuture<? extends T> src; |
1373 |
final CompletableFuture<? extends U> snd; |
1374 |
final BiFunction<? super T,? super U,? extends V> fn; |
1375 |
final CompletableFuture<V> dst; |
1376 |
final Executor executor; |
1377 |
AndFunction(CompletableFuture<? extends T> src, |
1378 |
CompletableFuture<? extends U> snd, |
1379 |
BiFunction<? super T,? super U,? extends V> fn, |
1380 |
CompletableFuture<V> dst, Executor executor) { |
1381 |
this.src = src; this.snd = snd; |
1382 |
this.fn = fn; this.dst = dst; |
1383 |
this.executor = executor; |
1384 |
} |
1385 |
public void run() { |
1386 |
Object r, s; T t; U u; Throwable ex; |
1387 |
CompletableFuture<? extends T> a; |
1388 |
CompletableFuture<? extends U> b; |
1389 |
BiFunction<? super T,? super U,? extends V> fn; |
1390 |
CompletableFuture<V> dst; |
1391 |
if ((dst = this.dst) != null && |
1392 |
(fn = this.fn) != null && |
1393 |
(a = this.src) != null && |
1394 |
(r = a.result) != null && |
1395 |
(b = this.snd) != null && |
1396 |
(s = b.result) != null && |
1397 |
compareAndSet(0, 1)) { |
1398 |
if (r instanceof AltResult) { |
1399 |
if ((ex = ((AltResult)r).ex) != null) { |
1400 |
dst.completeExceptionally(new RuntimeException(ex)); |
1401 |
return; |
1402 |
} |
1403 |
t = null; |
1404 |
} |
1405 |
else |
1406 |
t = (T) r; |
1407 |
if (s instanceof AltResult) { |
1408 |
if ((ex = ((AltResult)s).ex) != null) { |
1409 |
dst.completeExceptionally(new RuntimeException(ex)); |
1410 |
return; |
1411 |
} |
1412 |
u = null; |
1413 |
} |
1414 |
else |
1415 |
u = (U) s; |
1416 |
try { |
1417 |
if (executor != null) |
1418 |
executor.execute(new AsyncBiFunction<T,U,V>(t, u, fn, dst)); |
1419 |
else |
1420 |
dst.complete(fn.apply(t, u)); |
1421 |
} catch (Throwable rex) { |
1422 |
dst.completeExceptionally(rex); |
1423 |
} |
1424 |
} |
1425 |
} |
1426 |
} |
1427 |
|
1428 |
static final class AndBlock<T,U> extends Completion { |
1429 |
final CompletableFuture<? extends T> src; |
1430 |
final CompletableFuture<? extends U> snd; |
1431 |
final BiBlock<? super T,? super U> fn; |
1432 |
final CompletableFuture<Void> dst; |
1433 |
final Executor executor; |
1434 |
AndBlock(CompletableFuture<? extends T> src, |
1435 |
CompletableFuture<? extends U> snd, |
1436 |
BiBlock<? super T,? super U> fn, |
1437 |
CompletableFuture<Void> dst, Executor executor) { |
1438 |
this.src = src; this.snd = snd; |
1439 |
this.fn = fn; this.dst = dst; |
1440 |
this.executor = executor; |
1441 |
} |
1442 |
public void run() { |
1443 |
Object r, s; T t; U u; Throwable ex; |
1444 |
CompletableFuture<? extends T> a; |
1445 |
CompletableFuture<? extends U> b; |
1446 |
BiBlock<? super T,? super U> fn; |
1447 |
CompletableFuture<Void> dst; |
1448 |
if ((dst = this.dst) != null && |
1449 |
(fn = this.fn) != null && |
1450 |
(a = this.src) != null && |
1451 |
(r = a.result) != null && |
1452 |
(b = this.snd) != null && |
1453 |
(s = b.result) != null && |
1454 |
compareAndSet(0, 1)) { |
1455 |
if (r instanceof AltResult) { |
1456 |
if ((ex = ((AltResult)r).ex) != null) { |
1457 |
dst.completeExceptionally(new RuntimeException(ex)); |
1458 |
return; |
1459 |
} |
1460 |
t = null; |
1461 |
} |
1462 |
else |
1463 |
t = (T) r; |
1464 |
if (s instanceof AltResult) { |
1465 |
if ((ex = ((AltResult)s).ex) != null) { |
1466 |
dst.completeExceptionally(new RuntimeException(ex)); |
1467 |
return; |
1468 |
} |
1469 |
u = null; |
1470 |
} |
1471 |
else |
1472 |
u = (U) s; |
1473 |
try { |
1474 |
if (executor != null) |
1475 |
executor.execute(new AsyncBiBlock<T,U>(t, u, fn, dst)); |
1476 |
else { |
1477 |
fn.accept(t, u); |
1478 |
dst.complete(null); |
1479 |
} |
1480 |
} catch (Throwable rex) { |
1481 |
dst.completeExceptionally(rex); |
1482 |
} |
1483 |
} |
1484 |
} |
1485 |
} |
1486 |
|
1487 |
static final class AndRunnable<T> extends Completion { |
1488 |
final CompletableFuture<? extends T> src; |
1489 |
final CompletableFuture<?> snd; |
1490 |
final Runnable fn; |
1491 |
final CompletableFuture<Void> dst; |
1492 |
final Executor executor; |
1493 |
AndRunnable(CompletableFuture<? extends T> src, |
1494 |
CompletableFuture<?> snd, |
1495 |
Runnable fn, |
1496 |
CompletableFuture<Void> dst, Executor executor) { |
1497 |
this.src = src; this.snd = snd; |
1498 |
this.fn = fn; this.dst = dst; |
1499 |
this.executor = executor; |
1500 |
} |
1501 |
public void run() { |
1502 |
Object r, s; Throwable ex; |
1503 |
final CompletableFuture<? extends T> a; |
1504 |
final CompletableFuture<?> b; |
1505 |
final Runnable fn; |
1506 |
final CompletableFuture<Void> dst; |
1507 |
if ((dst = this.dst) != null && |
1508 |
(fn = this.fn) != null && |
1509 |
(a = this.src) != null && |
1510 |
(r = a.result) != null && |
1511 |
(b = this.snd) != null && |
1512 |
(s = b.result) != null && |
1513 |
compareAndSet(0, 1)) { |
1514 |
if (r instanceof AltResult) { |
1515 |
if ((ex = ((AltResult)r).ex) != null) { |
1516 |
dst.completeExceptionally(new RuntimeException(ex)); |
1517 |
return; |
1518 |
} |
1519 |
} |
1520 |
if (s instanceof AltResult) { |
1521 |
if ((ex = ((AltResult)s).ex) != null) { |
1522 |
dst.completeExceptionally(new RuntimeException(ex)); |
1523 |
return; |
1524 |
} |
1525 |
} |
1526 |
try { |
1527 |
if (executor != null) |
1528 |
executor.execute(new AsyncRunnable(fn, dst)); |
1529 |
else { |
1530 |
fn.run(); |
1531 |
dst.complete(null); |
1532 |
} |
1533 |
} catch (Throwable rex) { |
1534 |
dst.completeExceptionally(rex); |
1535 |
} |
1536 |
} |
1537 |
} |
1538 |
} |
1539 |
|
1540 |
static final class OrFunction<T,U> extends Completion { |
1541 |
final CompletableFuture<? extends T> src; |
1542 |
final CompletableFuture<? extends T> snd; |
1543 |
final Function<? super T,? extends U> fn; |
1544 |
final CompletableFuture<U> dst; |
1545 |
final Executor executor; |
1546 |
OrFunction(CompletableFuture<? extends T> src, |
1547 |
CompletableFuture<? extends T> snd, |
1548 |
Function<? super T,? extends U> fn, |
1549 |
CompletableFuture<U> dst, Executor executor) { |
1550 |
this.src = src; this.snd = snd; |
1551 |
this.fn = fn; this.dst = dst; |
1552 |
this.executor = executor; |
1553 |
} |
1554 |
public void run() { |
1555 |
Object r; T t; Throwable ex; |
1556 |
CompletableFuture<? extends T> a; |
1557 |
CompletableFuture<? extends T> b; |
1558 |
Function<? super T,? extends U> fn; |
1559 |
CompletableFuture<U> dst; |
1560 |
if ((dst = this.dst) != null && |
1561 |
(fn = this.fn) != null && |
1562 |
(((a = this.src) != null && (r = a.result) != null) || |
1563 |
((b = this.snd) != null && (r = b.result) != null)) && |
1564 |
compareAndSet(0, 1)) { |
1565 |
if (r instanceof AltResult) { |
1566 |
if ((ex = ((AltResult)r).ex) != null) { |
1567 |
dst.completeExceptionally(new RuntimeException(ex)); |
1568 |
return; |
1569 |
} |
1570 |
t = null; |
1571 |
} |
1572 |
else |
1573 |
t = (T) r; |
1574 |
try { |
1575 |
if (executor != null) |
1576 |
executor.execute(new AsyncFunction<T,U>(t, fn, dst)); |
1577 |
else |
1578 |
dst.complete(fn.apply(t)); |
1579 |
} catch (Throwable rex) { |
1580 |
dst.completeExceptionally(rex); |
1581 |
} |
1582 |
} |
1583 |
} |
1584 |
} |
1585 |
|
1586 |
static final class OrBlock<T> extends Completion { |
1587 |
final CompletableFuture<? extends T> src; |
1588 |
final CompletableFuture<? extends T> snd; |
1589 |
final Block<? super T> fn; |
1590 |
final CompletableFuture<Void> dst; |
1591 |
final Executor executor; |
1592 |
OrBlock(CompletableFuture<? extends T> src, |
1593 |
CompletableFuture<? extends T> snd, |
1594 |
Block<? super T> fn, |
1595 |
CompletableFuture<Void> dst, Executor executor) { |
1596 |
this.src = src; this.snd = snd; |
1597 |
this.fn = fn; this.dst = dst; |
1598 |
this.executor = executor; |
1599 |
} |
1600 |
public void run() { |
1601 |
Object r; T t; Throwable ex; |
1602 |
CompletableFuture<? extends T> a; |
1603 |
CompletableFuture<? extends T> b; |
1604 |
Block<? super T> fn; |
1605 |
CompletableFuture<Void> dst; |
1606 |
if ((dst = this.dst) != null && |
1607 |
(fn = this.fn) != null && |
1608 |
(((a = this.src) != null && (r = a.result) != null) || |
1609 |
((b = this.snd) != null && (r = b.result) != null)) && |
1610 |
compareAndSet(0, 1)) { |
1611 |
if (r instanceof AltResult) { |
1612 |
if ((ex = ((AltResult)r).ex) != null) { |
1613 |
dst.completeExceptionally(new RuntimeException(ex)); |
1614 |
return; |
1615 |
} |
1616 |
t = null; |
1617 |
} |
1618 |
else |
1619 |
t = (T) r; |
1620 |
try { |
1621 |
if (executor != null) |
1622 |
executor.execute(new AsyncBlock<T>(t, fn, dst)); |
1623 |
else { |
1624 |
fn.accept(t); |
1625 |
dst.complete(null); |
1626 |
} |
1627 |
} catch (Throwable rex) { |
1628 |
dst.completeExceptionally(rex); |
1629 |
} |
1630 |
} |
1631 |
} |
1632 |
} |
1633 |
|
1634 |
static final class OrRunnable<T> extends Completion { |
1635 |
final CompletableFuture<? extends T> src; |
1636 |
final CompletableFuture<?> snd; |
1637 |
final Runnable fn; |
1638 |
final CompletableFuture<Void> dst; |
1639 |
final Executor executor; |
1640 |
OrRunnable(CompletableFuture<? extends T> src, |
1641 |
CompletableFuture<?> snd, |
1642 |
Runnable fn, |
1643 |
CompletableFuture<Void> dst, Executor executor) { |
1644 |
this.src = src; this.snd = snd; |
1645 |
this.fn = fn; this.dst = dst; |
1646 |
this.executor = executor; |
1647 |
} |
1648 |
public void run() { |
1649 |
Object r; Throwable ex; |
1650 |
CompletableFuture<? extends T> a; |
1651 |
final CompletableFuture<?> b; |
1652 |
final Runnable fn; |
1653 |
final CompletableFuture<Void> dst; |
1654 |
if ((dst = this.dst) != null && |
1655 |
(fn = this.fn) != null && |
1656 |
(((a = this.src) != null && (r = a.result) != null) || |
1657 |
((b = this.snd) != null && (r = b.result) != null)) && |
1658 |
compareAndSet(0, 1)) { |
1659 |
if ((r instanceof AltResult) && |
1660 |
(ex = ((AltResult)r).ex) != null) { |
1661 |
dst.completeExceptionally(new RuntimeException(ex)); |
1662 |
} |
1663 |
else { |
1664 |
try { |
1665 |
if (executor != null) |
1666 |
executor.execute(new AsyncRunnable(fn, dst)); |
1667 |
else { |
1668 |
fn.run(); |
1669 |
dst.complete(null); |
1670 |
} |
1671 |
} catch (Throwable rex) { |
1672 |
dst.completeExceptionally(rex); |
1673 |
} |
1674 |
} |
1675 |
} |
1676 |
} |
1677 |
} |
1678 |
|
1679 |
static final class ExceptionAction<T> extends Completion { |
1680 |
final CompletableFuture<? extends T> src; |
1681 |
final Function<? super Throwable, ? extends T> fn; |
1682 |
final CompletableFuture<T> dst; |
1683 |
ExceptionAction(CompletableFuture<? extends T> src, |
1684 |
Function<? super Throwable, ? extends T> fn, |
1685 |
CompletableFuture<T> dst) { |
1686 |
this.src = src; this.fn = fn; this.dst = dst; |
1687 |
} |
1688 |
public void run() { |
1689 |
CompletableFuture<? extends T> a; |
1690 |
Function<? super Throwable, ? extends T> fn; |
1691 |
CompletableFuture<T> dst; |
1692 |
Object r; T t; Throwable ex; |
1693 |
if ((dst = this.dst) != null && |
1694 |
(fn = this.fn) != null && |
1695 |
(a = this.src) != null && |
1696 |
(r = a.result) != null && |
1697 |
compareAndSet(0, 1)) { |
1698 |
if (r instanceof AltResult) { |
1699 |
if ((ex = ((AltResult)r).ex) != null) { |
1700 |
try { |
1701 |
dst.complete(fn.apply(ex)); |
1702 |
} catch (Throwable rex) { |
1703 |
dst.completeExceptionally(rex); |
1704 |
} |
1705 |
return; |
1706 |
} |
1707 |
t = null; |
1708 |
} |
1709 |
else |
1710 |
t = (T) r; |
1711 |
dst.complete(t); |
1712 |
} |
1713 |
} |
1714 |
} |
1715 |
|
1716 |
/* ------------- then/and/or implementations -------------- */ |
1717 |
|
1718 |
private <U> CompletableFuture<U> thenFunction(Function<? super T,? extends U> fn, |
1719 |
Executor executor) { |
1720 |
|
1721 |
if (fn == null) throw new NullPointerException(); |
1722 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
1723 |
ThenFunction<T,U> d = null; |
1724 |
Object r; |
1725 |
if ((r = result) == null) { |
1726 |
CompletionNode p = new CompletionNode |
1727 |
(d = new ThenFunction<T,U>(this, fn, dst, executor)); |
1728 |
while ((r = result) == null) { |
1729 |
if (UNSAFE.compareAndSwapObject |
1730 |
(this, COMPLETIONS, p.next = completions, p)) |
1731 |
break; |
1732 |
} |
1733 |
} |
1734 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1735 |
T t; Throwable ex = null; |
1736 |
if (r instanceof AltResult) { |
1737 |
if ((ex = ((AltResult)r).ex) != null) |
1738 |
dst.completeExceptionally(new RuntimeException(ex)); |
1739 |
t = null; |
1740 |
} |
1741 |
else |
1742 |
t = (T) r; |
1743 |
if (ex == null) { |
1744 |
try { |
1745 |
if (executor != null) |
1746 |
executor.execute(new AsyncFunction<T,U>(t, fn, dst)); |
1747 |
else |
1748 |
dst.complete(fn.apply(t)); |
1749 |
} catch (Throwable rex) { |
1750 |
dst.completeExceptionally(rex); |
1751 |
} |
1752 |
} |
1753 |
postComplete(); |
1754 |
} |
1755 |
return dst; |
1756 |
} |
1757 |
|
1758 |
private CompletableFuture<Void> thenBlock(Block<? super T> fn, |
1759 |
Executor executor) { |
1760 |
|
1761 |
if (fn == null) throw new NullPointerException(); |
1762 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1763 |
ThenBlock<T> d = null; |
1764 |
Object r; |
1765 |
if ((r = result) == null) { |
1766 |
CompletionNode p = new CompletionNode |
1767 |
(d = new ThenBlock<T>(this, fn, dst, executor)); |
1768 |
while ((r = result) == null) { |
1769 |
if (UNSAFE.compareAndSwapObject |
1770 |
(this, COMPLETIONS, p.next = completions, p)) |
1771 |
break; |
1772 |
} |
1773 |
} |
1774 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1775 |
T t; Throwable ex = null; |
1776 |
if (r instanceof AltResult) { |
1777 |
if ((ex = ((AltResult)r).ex) != null) |
1778 |
dst.completeExceptionally(new RuntimeException(ex)); |
1779 |
t = null; |
1780 |
} |
1781 |
else |
1782 |
t = (T) r; |
1783 |
if (ex == null) { |
1784 |
try { |
1785 |
if (executor != null) |
1786 |
executor.execute(new AsyncBlock<T>(t, fn, dst)); |
1787 |
else { |
1788 |
fn.accept(t); |
1789 |
dst.complete(null); |
1790 |
} |
1791 |
} catch (Throwable rex) { |
1792 |
dst.completeExceptionally(rex); |
1793 |
} |
1794 |
} |
1795 |
postComplete(); |
1796 |
} |
1797 |
return dst; |
1798 |
} |
1799 |
|
1800 |
private CompletableFuture<Void> thenRunnable(Runnable action, |
1801 |
Executor executor) { |
1802 |
if (action == null) throw new NullPointerException(); |
1803 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1804 |
ThenRunnable<T> d = null; |
1805 |
Object r; |
1806 |
if ((r = result) == null) { |
1807 |
CompletionNode p = new CompletionNode |
1808 |
(d = new ThenRunnable<T>(this, action, dst, executor)); |
1809 |
while ((r = result) == null) { |
1810 |
if (UNSAFE.compareAndSwapObject |
1811 |
(this, COMPLETIONS, p.next = completions, p)) |
1812 |
break; |
1813 |
} |
1814 |
} |
1815 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1816 |
Throwable ex = null; |
1817 |
if (r instanceof AltResult) { |
1818 |
if ((ex = ((AltResult)r).ex) != null) |
1819 |
dst.completeExceptionally(new RuntimeException(ex)); |
1820 |
} |
1821 |
if (ex == null) { |
1822 |
try { |
1823 |
if (executor != null) |
1824 |
executor.execute(new AsyncRunnable(action, dst)); |
1825 |
else { |
1826 |
action.run(); |
1827 |
dst.complete(null); |
1828 |
} |
1829 |
} catch (Throwable rex) { |
1830 |
dst.completeExceptionally(rex); |
1831 |
} |
1832 |
} |
1833 |
postComplete(); |
1834 |
} |
1835 |
return dst; |
1836 |
} |
1837 |
|
1838 |
private <U,V> CompletableFuture<V> andFunction(CompletableFuture<? extends U> other, |
1839 |
BiFunction<? super T,? super U,? extends V> fn, |
1840 |
Executor executor) { |
1841 |
if (other == null || fn == null) throw new NullPointerException(); |
1842 |
CompletableFuture<V> dst = new CompletableFuture<V>(); |
1843 |
AndFunction<T,U,V> d = null; |
1844 |
Object r, s = null; |
1845 |
if ((r = result) == null || (s = other.result) == null) { |
1846 |
d = new AndFunction<T,U,V>(this, other, fn, dst, executor); |
1847 |
CompletionNode q = null, p = new CompletionNode(d); |
1848 |
while ((r == null && (r = result) == null) || |
1849 |
(s == null && (s = other.result) == null)) { |
1850 |
if (q != null) { |
1851 |
if (s != null || |
1852 |
UNSAFE.compareAndSwapObject |
1853 |
(other, COMPLETIONS, q.next = other.completions, q)) |
1854 |
break; |
1855 |
} |
1856 |
else if (r != null || |
1857 |
UNSAFE.compareAndSwapObject |
1858 |
(this, COMPLETIONS, p.next = completions, p)) { |
1859 |
if (s != null) |
1860 |
break; |
1861 |
q = new CompletionNode(d); |
1862 |
} |
1863 |
} |
1864 |
} |
1865 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
1866 |
T t; U u; Throwable ex = null; |
1867 |
if (r instanceof AltResult) { |
1868 |
if ((ex = ((AltResult)r).ex) != null) |
1869 |
dst.completeExceptionally(new RuntimeException(ex)); |
1870 |
t = null; |
1871 |
} |
1872 |
else |
1873 |
t = (T) r; |
1874 |
if (ex != null) |
1875 |
u = null; |
1876 |
else if (s instanceof AltResult) { |
1877 |
if ((ex = ((AltResult)s).ex) != null) |
1878 |
dst.completeExceptionally(new RuntimeException(ex)); |
1879 |
u = null; |
1880 |
} |
1881 |
else |
1882 |
u = (U) s; |
1883 |
if (ex == null) { |
1884 |
try { |
1885 |
if (executor != null) |
1886 |
executor.execute(new AsyncBiFunction<T,U,V>(t, u, fn, dst)); |
1887 |
else |
1888 |
dst.complete(fn.apply(t, u)); |
1889 |
} catch (Throwable rex) { |
1890 |
dst.completeExceptionally(rex); |
1891 |
} |
1892 |
} |
1893 |
} |
1894 |
if (r != null) |
1895 |
postComplete(); |
1896 |
if (s != null) |
1897 |
other.postComplete(); |
1898 |
return dst; |
1899 |
} |
1900 |
|
1901 |
private <U> CompletableFuture<Void> andBlock(CompletableFuture<? extends U> other, |
1902 |
BiBlock<? super T,? super U> fn, |
1903 |
Executor executor) { |
1904 |
if (other == null || fn == null) throw new NullPointerException(); |
1905 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1906 |
AndBlock<T,U> d = null; |
1907 |
Object r, s = null; |
1908 |
if ((r = result) == null || (s = other.result) == null) { |
1909 |
d = new AndBlock<T,U>(this, other, fn, dst, executor); |
1910 |
CompletionNode q = null, p = new CompletionNode(d); |
1911 |
while ((r == null && (r = result) == null) || |
1912 |
(s == null && (s = other.result) == null)) { |
1913 |
if (q != null) { |
1914 |
if (s != null || |
1915 |
UNSAFE.compareAndSwapObject |
1916 |
(other, COMPLETIONS, q.next = other.completions, q)) |
1917 |
break; |
1918 |
} |
1919 |
else if (r != null || |
1920 |
UNSAFE.compareAndSwapObject |
1921 |
(this, COMPLETIONS, p.next = completions, p)) { |
1922 |
if (s != null) |
1923 |
break; |
1924 |
q = new CompletionNode(d); |
1925 |
} |
1926 |
} |
1927 |
} |
1928 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
1929 |
T t; U u; Throwable ex = null; |
1930 |
if (r instanceof AltResult) { |
1931 |
if ((ex = ((AltResult)r).ex) != null) |
1932 |
dst.completeExceptionally(new RuntimeException(ex)); |
1933 |
t = null; |
1934 |
} |
1935 |
else |
1936 |
t = (T) r; |
1937 |
if (ex != null) |
1938 |
u = null; |
1939 |
else if (s instanceof AltResult) { |
1940 |
if ((ex = ((AltResult)s).ex) != null) |
1941 |
dst.completeExceptionally(new RuntimeException(ex)); |
1942 |
u = null; |
1943 |
} |
1944 |
else |
1945 |
u = (U) s; |
1946 |
if (ex == null) { |
1947 |
try { |
1948 |
if (executor != null) |
1949 |
executor.execute(new AsyncBiBlock<T,U>(t, u, fn, dst)); |
1950 |
else { |
1951 |
fn.accept(t, u); |
1952 |
dst.complete(null); |
1953 |
} |
1954 |
} catch (Throwable rex) { |
1955 |
dst.completeExceptionally(rex); |
1956 |
} |
1957 |
} |
1958 |
} |
1959 |
if (r != null) |
1960 |
postComplete(); |
1961 |
if (s != null) |
1962 |
other.postComplete(); |
1963 |
return dst; |
1964 |
} |
1965 |
|
1966 |
private CompletableFuture<Void> andRunnable(CompletableFuture<?> other, |
1967 |
Runnable action, |
1968 |
Executor executor) { |
1969 |
if (other == null || action == null) throw new NullPointerException(); |
1970 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1971 |
AndRunnable<T> d = null; |
1972 |
Object r, s = null; |
1973 |
if ((r = result) == null || (s = other.result) == null) { |
1974 |
d = new AndRunnable<T>(this, other, action, dst, executor); |
1975 |
CompletionNode q = null, p = new CompletionNode(d); |
1976 |
while ((r == null && (r = result) == null) || |
1977 |
(s == null && (s = other.result) == null)) { |
1978 |
if (q != null) { |
1979 |
if (s != null || |
1980 |
UNSAFE.compareAndSwapObject |
1981 |
(other, COMPLETIONS, q.next = other.completions, q)) |
1982 |
break; |
1983 |
} |
1984 |
else if (r != null || |
1985 |
UNSAFE.compareAndSwapObject |
1986 |
(this, COMPLETIONS, p.next = completions, p)) { |
1987 |
if (s != null) |
1988 |
break; |
1989 |
q = new CompletionNode(d); |
1990 |
} |
1991 |
} |
1992 |
} |
1993 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
1994 |
Throwable ex = null; |
1995 |
if ((r instanceof AltResult) && |
1996 |
(ex = ((AltResult)r).ex) != null) |
1997 |
dst.completeExceptionally(new RuntimeException(ex)); |
1998 |
else if ((s instanceof AltResult) && |
1999 |
(ex = ((AltResult)s).ex) != null) |
2000 |
dst.completeExceptionally(new RuntimeException(ex)); |
2001 |
else { |
2002 |
try { |
2003 |
if (executor != null) |
2004 |
executor.execute(new AsyncRunnable(action, dst)); |
2005 |
else { |
2006 |
action.run(); |
2007 |
dst.complete(null); |
2008 |
} |
2009 |
} catch (Throwable rex) { |
2010 |
dst.completeExceptionally(rex); |
2011 |
} |
2012 |
} |
2013 |
} |
2014 |
if (r != null) |
2015 |
postComplete(); |
2016 |
if (s != null) |
2017 |
other.postComplete(); |
2018 |
return dst; |
2019 |
} |
2020 |
|
2021 |
private <U> CompletableFuture<U> orFunction(CompletableFuture<? extends T> other, |
2022 |
Function<? super T, U> fn, |
2023 |
Executor executor) { |
2024 |
if (other == null || fn == null) throw new NullPointerException(); |
2025 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
2026 |
OrFunction<T,U> d = null; |
2027 |
Object r; |
2028 |
if ((r = result) == null && (r = other.result) == null) { |
2029 |
d = new OrFunction<T,U>(this, other, fn, dst, executor); |
2030 |
CompletionNode q = null, p = new CompletionNode(d); |
2031 |
while ((r = result) == null && (r = other.result) == null) { |
2032 |
if (q != null) { |
2033 |
if (UNSAFE.compareAndSwapObject |
2034 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2035 |
break; |
2036 |
} |
2037 |
else if (UNSAFE.compareAndSwapObject |
2038 |
(this, COMPLETIONS, p.next = completions, p)) |
2039 |
q = new CompletionNode(d); |
2040 |
} |
2041 |
} |
2042 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2043 |
T t; Throwable ex = null; |
2044 |
if (r instanceof AltResult) { |
2045 |
if ((ex = ((AltResult)r).ex) != null) |
2046 |
dst.completeExceptionally(new RuntimeException(ex)); |
2047 |
t = null; |
2048 |
} |
2049 |
else |
2050 |
t = (T) r; |
2051 |
if (ex == null) { |
2052 |
try { |
2053 |
if (executor != null) |
2054 |
executor.execute(new AsyncFunction<T,U>(t, fn, dst)); |
2055 |
else |
2056 |
dst.complete(fn.apply(t)); |
2057 |
} catch (Throwable rex) { |
2058 |
dst.completeExceptionally(rex); |
2059 |
} |
2060 |
} |
2061 |
} |
2062 |
if (r != null) { |
2063 |
if (result != null) |
2064 |
postComplete(); |
2065 |
if (other.result != null) |
2066 |
other.postComplete(); |
2067 |
} |
2068 |
return dst; |
2069 |
} |
2070 |
|
2071 |
private CompletableFuture<Void> orBlock(CompletableFuture<? extends T> other, |
2072 |
Block<? super T> fn, |
2073 |
Executor executor) { |
2074 |
if (other == null || fn == null) throw new NullPointerException(); |
2075 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2076 |
OrBlock<T> d = null; |
2077 |
Object r; |
2078 |
if ((r = result) == null && (r = other.result) == null) { |
2079 |
d = new OrBlock<T>(this, other, fn, dst, executor); |
2080 |
CompletionNode q = null, p = new CompletionNode(d); |
2081 |
while ((r = result) == null && (r = other.result) == null) { |
2082 |
if (q != null) { |
2083 |
if (UNSAFE.compareAndSwapObject |
2084 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2085 |
break; |
2086 |
} |
2087 |
else if (UNSAFE.compareAndSwapObject |
2088 |
(this, COMPLETIONS, p.next = completions, p)) |
2089 |
q = new CompletionNode(d); |
2090 |
} |
2091 |
} |
2092 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2093 |
T t; Throwable ex = null; |
2094 |
if (r instanceof AltResult) { |
2095 |
if ((ex = ((AltResult)r).ex) != null) |
2096 |
dst.completeExceptionally(new RuntimeException(ex)); |
2097 |
t = null; |
2098 |
} |
2099 |
else |
2100 |
t = (T) r; |
2101 |
if (ex == null) { |
2102 |
try { |
2103 |
if (executor != null) |
2104 |
executor.execute(new AsyncBlock<T>(t, fn, dst)); |
2105 |
else { |
2106 |
fn.accept(t); |
2107 |
dst.complete(null); |
2108 |
} |
2109 |
} catch (Throwable rex) { |
2110 |
dst.completeExceptionally(rex); |
2111 |
} |
2112 |
} |
2113 |
} |
2114 |
if (r != null) { |
2115 |
if (result != null) |
2116 |
postComplete(); |
2117 |
if (other.result != null) |
2118 |
other.postComplete(); |
2119 |
} |
2120 |
return dst; |
2121 |
} |
2122 |
|
2123 |
private CompletableFuture<Void> orRunnable(CompletableFuture<?> other, |
2124 |
Runnable action, |
2125 |
Executor executor) { |
2126 |
if (other == null || action == null) throw new NullPointerException(); |
2127 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2128 |
OrRunnable<T> d = null; |
2129 |
Object r; |
2130 |
if ((r = result) == null && (r = other.result) == null) { |
2131 |
d = new OrRunnable<T>(this, other, action, dst, executor); |
2132 |
CompletionNode q = null, p = new CompletionNode(d); |
2133 |
while ((r = result) == null && (r = other.result) == null) { |
2134 |
if (q != null) { |
2135 |
if (UNSAFE.compareAndSwapObject |
2136 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2137 |
break; |
2138 |
} |
2139 |
else if (UNSAFE.compareAndSwapObject |
2140 |
(this, COMPLETIONS, p.next = completions, p)) |
2141 |
q = new CompletionNode(d); |
2142 |
} |
2143 |
} |
2144 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2145 |
Throwable ex = null; |
2146 |
if ((r instanceof AltResult) && |
2147 |
(ex = ((AltResult)r).ex) != null) |
2148 |
dst.completeExceptionally(new RuntimeException(ex)); |
2149 |
else { |
2150 |
try { |
2151 |
if (executor != null) |
2152 |
executor.execute(new AsyncRunnable(action, dst)); |
2153 |
else { |
2154 |
action.run(); |
2155 |
dst.complete(null); |
2156 |
} |
2157 |
} catch (Throwable rex) { |
2158 |
dst.completeExceptionally(rex); |
2159 |
} |
2160 |
} |
2161 |
} |
2162 |
if (r != null) { |
2163 |
if (result != null) |
2164 |
postComplete(); |
2165 |
if (other.result != null) |
2166 |
other.postComplete(); |
2167 |
} |
2168 |
return dst; |
2169 |
} |
2170 |
|
2171 |
// Unsafe mechanics |
2172 |
private static final sun.misc.Unsafe UNSAFE; |
2173 |
private static final long RESULT; |
2174 |
private static final long WAITERS; |
2175 |
private static final long COMPLETIONS; |
2176 |
static { |
2177 |
try { |
2178 |
UNSAFE = sun.misc.Unsafe.getUnsafe(); |
2179 |
Class<?> k = CompletableFuture.class; |
2180 |
RESULT = UNSAFE.objectFieldOffset |
2181 |
(k.getDeclaredField("result")); |
2182 |
WAITERS = UNSAFE.objectFieldOffset |
2183 |
(k.getDeclaredField("waiters")); |
2184 |
COMPLETIONS = UNSAFE.objectFieldOffset |
2185 |
(k.getDeclaredField("completions")); |
2186 |
} catch (Exception e) { |
2187 |
throw new Error(e); |
2188 |
} |
2189 |
} |
2190 |
|
2191 |
} |