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.Consumer; |
10 |
import java.util.function.BiConsumer; |
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>When two or more threads attempt to {@link #complete} or {@link |
31 |
* #completeExceptionally} a CompletableFuture, only one of them |
32 |
* succeeds. |
33 |
* |
34 |
* <p>Methods are available for adding dependents based on Functions, |
35 |
* Consumers, and Runnables. The appropriate form to use depends on |
36 |
* whether actions require arguments and/or produce results. Actions |
37 |
* may also be triggered after either or both the current and another |
38 |
* CompletableFuture complete. Multiple CompletableFutures may also |
39 |
* be grouped as one using {@link #anyOf} and {@link #allOf}. |
40 |
* |
41 |
* <p>Actions supplied for dependent completions (mainly using methods |
42 |
* with prefix {@code then}) may be performed by the thread that |
43 |
* completes the current CompletableFuture, or by any other caller of |
44 |
* these methods. There are no guarantees about the order of |
45 |
* processing completions unless constrained by these methods. |
46 |
* |
47 |
* <p>Upon exceptional completion, or when a completion entails |
48 |
* computation, and it terminates abruptly with an (unchecked) |
49 |
* exception or error, then further completions act as {@code |
50 |
* completeExceptionally} with a {@link CompletionException} holding |
51 |
* that exception as its cause. If a CompletableFuture completes |
52 |
* exceptionally, and is not followed by a {@link #exceptionally} or |
53 |
* {@link #handle} completion, then all of its dependents (and their |
54 |
* dependents) also complete exceptionally with CompletionExceptions |
55 |
* holding the ultimate cause. In case of a CompletionException, |
56 |
* methods {@link #get()} and {@link #get(long, TimeUnit)} throw an |
57 |
* {@link ExecutionException} with the same cause as would be held in |
58 |
* the corresponding CompletionException. However, in these cases, |
59 |
* methods {@link #join()} and {@link #getNow} throw the |
60 |
* CompletionException, which simplifies usage especially within other |
61 |
* completion functions. |
62 |
* |
63 |
* <p>CompletableFutures themselves do not execute asynchronously. |
64 |
* However, the {@code async} methods provide commonly useful ways to |
65 |
* commence asynchronous processing, using either a given {@link |
66 |
* Executor} or by default the {@link ForkJoinPool#commonPool()}, of a |
67 |
* function or action that will result in the completion of a new |
68 |
* CompletableFuture. To simplify monitoring, debugging, and tracking, |
69 |
* all generated asynchronous tasks are instances of the tagging |
70 |
* interface {@link AsynchronousCompletionTask}. |
71 |
* |
72 |
* @author Doug Lea |
73 |
* @since 1.8 |
74 |
*/ |
75 |
public class CompletableFuture<T> implements Future<T> { |
76 |
|
77 |
/* |
78 |
* Overview: |
79 |
* |
80 |
* 1. Non-nullness of field result (set via CAS) indicates done. |
81 |
* An AltResult is used to box null as a result, as well as to |
82 |
* hold exceptions. Using a single field makes completion fast |
83 |
* and simple to detect and trigger, at the expense of a lot of |
84 |
* encoding and decoding that infiltrates many methods. One minor |
85 |
* simplification relies on the (static) NIL (to box null results) |
86 |
* being the only AltResult with a null exception field, so we |
87 |
* don't usually need explicit comparisons with NIL. The CF |
88 |
* exception propagation mechanics surrounding decoding rely on |
89 |
* unchecked casts of decoded results really being unchecked, |
90 |
* where user type errors are caught at point of use, as is |
91 |
* currently the case in Java. These are highlighted by using |
92 |
* SuppressWarnings-annotated temporaries. |
93 |
* |
94 |
* 2. Waiters are held in a Treiber stack similar to the one used |
95 |
* in FutureTask, Phaser, and SynchronousQueue. See their |
96 |
* internal documentation for algorithmic details. |
97 |
* |
98 |
* 3. Completions are also kept in a list/stack, and pulled off |
99 |
* and run when completion is triggered. (We could even use the |
100 |
* same stack as for waiters, but would give up the potential |
101 |
* parallelism obtained because woken waiters help release/run |
102 |
* others -- see method postComplete). Because post-processing |
103 |
* may race with direct calls, class Completion opportunistically |
104 |
* extends AtomicInteger so callers can claim the action via |
105 |
* compareAndSet(0, 1). The Completion.run methods are all |
106 |
* written a boringly similar uniform way (that sometimes includes |
107 |
* unnecessary-looking checks, kept to maintain uniformity). There |
108 |
* are enough dimensions upon which they differ that attempts to |
109 |
* factor commonalities while maintaining efficiency require more |
110 |
* lines of code than they would save. |
111 |
* |
112 |
* 4. The exported then/and/or methods do support a bit of |
113 |
* factoring (see doThenApply etc). They must cope with the |
114 |
* intrinsic races surrounding addition of a dependent action |
115 |
* versus performing the action directly because the task is |
116 |
* already complete. For example, a CF may not be complete upon |
117 |
* entry, so a dependent completion is added, but by the time it |
118 |
* is added, the target CF is complete, so must be directly |
119 |
* executed. This is all done while avoiding unnecessary object |
120 |
* construction in safe-bypass cases. |
121 |
*/ |
122 |
|
123 |
// preliminaries |
124 |
|
125 |
static final class AltResult { |
126 |
final Throwable ex; // null only for NIL |
127 |
AltResult(Throwable ex) { this.ex = ex; } |
128 |
} |
129 |
|
130 |
static final AltResult NIL = new AltResult(null); |
131 |
|
132 |
// Fields |
133 |
|
134 |
volatile Object result; // Either the result or boxed AltResult |
135 |
volatile WaitNode waiters; // Treiber stack of threads blocked on get() |
136 |
volatile CompletionNode completions; // list (Treiber stack) of completions |
137 |
|
138 |
// Basic utilities for triggering and processing completions |
139 |
|
140 |
/** |
141 |
* Removes and signals all waiting threads and runs all completions. |
142 |
*/ |
143 |
final void postComplete() { |
144 |
WaitNode q; Thread t; |
145 |
while ((q = waiters) != null) { |
146 |
if (UNSAFE.compareAndSwapObject(this, WAITERS, q, q.next) && |
147 |
(t = q.thread) != null) { |
148 |
q.thread = null; |
149 |
LockSupport.unpark(t); |
150 |
} |
151 |
} |
152 |
|
153 |
CompletionNode h; Completion c; |
154 |
while ((h = completions) != null) { |
155 |
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, h, h.next) && |
156 |
(c = h.completion) != null) |
157 |
c.run(); |
158 |
} |
159 |
} |
160 |
|
161 |
/** |
162 |
* Triggers completion with the encoding of the given arguments: |
163 |
* if the exception is non-null, encodes it as a wrapped |
164 |
* CompletionException unless it is one already. Otherwise uses |
165 |
* the given result, boxed as NIL if null. |
166 |
*/ |
167 |
final void internalComplete(Object v, Throwable ex) { |
168 |
if (result == null) |
169 |
UNSAFE.compareAndSwapObject |
170 |
(this, RESULT, null, |
171 |
(ex == null) ? (v == null) ? NIL : v : |
172 |
new AltResult((ex instanceof CompletionException) ? ex : |
173 |
new CompletionException(ex))); |
174 |
postComplete(); // help out even if not triggered |
175 |
} |
176 |
|
177 |
/** |
178 |
* If triggered, helps release and/or process completions. |
179 |
*/ |
180 |
final void helpPostComplete() { |
181 |
if (result != null) |
182 |
postComplete(); |
183 |
} |
184 |
|
185 |
/* ------------- waiting for completions -------------- */ |
186 |
|
187 |
/** Number of processors, for spin control */ |
188 |
static final int NCPU = Runtime.getRuntime().availableProcessors(); |
189 |
|
190 |
/** |
191 |
* Heuristic spin value for waitingGet() before blocking on |
192 |
* multiprocessors |
193 |
*/ |
194 |
static final int SPINS = (NCPU > 1) ? 1 << 8 : 0; |
195 |
|
196 |
/** |
197 |
* Linked nodes to record waiting threads in a Treiber stack. See |
198 |
* other classes such as Phaser and SynchronousQueue for more |
199 |
* detailed explanation. This class implements ManagedBlocker to |
200 |
* avoid starvation when blocking actions pile up in |
201 |
* ForkJoinPools. |
202 |
*/ |
203 |
static final class WaitNode implements ForkJoinPool.ManagedBlocker { |
204 |
long nanos; // wait time if timed |
205 |
final long deadline; // non-zero if timed |
206 |
volatile int interruptControl; // > 0: interruptible, < 0: interrupted |
207 |
volatile Thread thread; |
208 |
volatile WaitNode next; |
209 |
WaitNode(boolean interruptible, long nanos, long deadline) { |
210 |
this.thread = Thread.currentThread(); |
211 |
this.interruptControl = interruptible ? 1 : 0; |
212 |
this.nanos = nanos; |
213 |
this.deadline = deadline; |
214 |
} |
215 |
public boolean isReleasable() { |
216 |
if (thread == null) |
217 |
return true; |
218 |
if (Thread.interrupted()) { |
219 |
int i = interruptControl; |
220 |
interruptControl = -1; |
221 |
if (i > 0) |
222 |
return true; |
223 |
} |
224 |
if (deadline != 0L && |
225 |
(nanos <= 0L || (nanos = deadline - System.nanoTime()) <= 0L)) { |
226 |
thread = null; |
227 |
return true; |
228 |
} |
229 |
return false; |
230 |
} |
231 |
public boolean block() { |
232 |
if (isReleasable()) |
233 |
return true; |
234 |
else if (deadline == 0L) |
235 |
LockSupport.park(this); |
236 |
else if (nanos > 0L) |
237 |
LockSupport.parkNanos(this, nanos); |
238 |
return isReleasable(); |
239 |
} |
240 |
} |
241 |
|
242 |
/** |
243 |
* Returns raw result after waiting, or null if interruptible and |
244 |
* interrupted. |
245 |
*/ |
246 |
private Object waitingGet(boolean interruptible) { |
247 |
WaitNode q = null; |
248 |
boolean queued = false; |
249 |
int spins = SPINS; |
250 |
for (Object r;;) { |
251 |
if ((r = result) != null) { |
252 |
if (q != null) { // suppress unpark |
253 |
q.thread = null; |
254 |
if (q.interruptControl < 0) { |
255 |
if (interruptible) { |
256 |
removeWaiter(q); |
257 |
return null; |
258 |
} |
259 |
Thread.currentThread().interrupt(); |
260 |
} |
261 |
} |
262 |
postComplete(); // help release others |
263 |
return r; |
264 |
} |
265 |
else if (spins > 0) { |
266 |
int rnd = ThreadLocalRandom.nextSecondarySeed(); |
267 |
if (rnd == 0) |
268 |
rnd = ThreadLocalRandom.current().nextInt(); |
269 |
if (rnd >= 0) |
270 |
--spins; |
271 |
} |
272 |
else if (q == null) |
273 |
q = new WaitNode(interruptible, 0L, 0L); |
274 |
else if (!queued) |
275 |
queued = UNSAFE.compareAndSwapObject(this, WAITERS, |
276 |
q.next = waiters, q); |
277 |
else if (interruptible && q.interruptControl < 0) { |
278 |
removeWaiter(q); |
279 |
return null; |
280 |
} |
281 |
else if (q.thread != null && result == null) { |
282 |
try { |
283 |
ForkJoinPool.managedBlock(q); |
284 |
} catch (InterruptedException ex) { |
285 |
q.interruptControl = -1; |
286 |
} |
287 |
} |
288 |
} |
289 |
} |
290 |
|
291 |
/** |
292 |
* Awaits completion or aborts on interrupt or timeout. |
293 |
* |
294 |
* @param nanos time to wait |
295 |
* @return raw result |
296 |
*/ |
297 |
private Object timedAwaitDone(long nanos) |
298 |
throws InterruptedException, TimeoutException { |
299 |
WaitNode q = null; |
300 |
boolean queued = false; |
301 |
for (Object r;;) { |
302 |
if ((r = result) != null) { |
303 |
if (q != null) { |
304 |
q.thread = null; |
305 |
if (q.interruptControl < 0) { |
306 |
removeWaiter(q); |
307 |
throw new InterruptedException(); |
308 |
} |
309 |
} |
310 |
postComplete(); |
311 |
return r; |
312 |
} |
313 |
else if (q == null) { |
314 |
if (nanos <= 0L) |
315 |
throw new TimeoutException(); |
316 |
long d = System.nanoTime() + nanos; |
317 |
q = new WaitNode(true, nanos, d == 0L ? 1L : d); // avoid 0 |
318 |
} |
319 |
else if (!queued) |
320 |
queued = UNSAFE.compareAndSwapObject(this, WAITERS, |
321 |
q.next = waiters, q); |
322 |
else if (q.interruptControl < 0) { |
323 |
removeWaiter(q); |
324 |
throw new InterruptedException(); |
325 |
} |
326 |
else if (q.nanos <= 0L) { |
327 |
if (result == null) { |
328 |
removeWaiter(q); |
329 |
throw new TimeoutException(); |
330 |
} |
331 |
} |
332 |
else if (q.thread != null && result == null) { |
333 |
try { |
334 |
ForkJoinPool.managedBlock(q); |
335 |
} catch (InterruptedException ex) { |
336 |
q.interruptControl = -1; |
337 |
} |
338 |
} |
339 |
} |
340 |
} |
341 |
|
342 |
/** |
343 |
* Tries to unlink a timed-out or interrupted wait node to avoid |
344 |
* accumulating garbage. Internal nodes are simply unspliced |
345 |
* without CAS since it is harmless if they are traversed anyway |
346 |
* by releasers. To avoid effects of unsplicing from already |
347 |
* removed nodes, the list is retraversed in case of an apparent |
348 |
* race. This is slow when there are a lot of nodes, but we don't |
349 |
* expect lists to be long enough to outweigh higher-overhead |
350 |
* schemes. |
351 |
*/ |
352 |
private void removeWaiter(WaitNode node) { |
353 |
if (node != null) { |
354 |
node.thread = null; |
355 |
retry: |
356 |
for (;;) { // restart on removeWaiter race |
357 |
for (WaitNode pred = null, q = waiters, s; q != null; q = s) { |
358 |
s = q.next; |
359 |
if (q.thread != null) |
360 |
pred = q; |
361 |
else if (pred != null) { |
362 |
pred.next = s; |
363 |
if (pred.thread == null) // check for race |
364 |
continue retry; |
365 |
} |
366 |
else if (!UNSAFE.compareAndSwapObject(this, WAITERS, q, s)) |
367 |
continue retry; |
368 |
} |
369 |
break; |
370 |
} |
371 |
} |
372 |
} |
373 |
|
374 |
/* ------------- Async tasks -------------- */ |
375 |
|
376 |
/** |
377 |
* A tagging interface identifying asynchronous tasks produced by |
378 |
* {@code async} methods. This may be useful for monitoring, |
379 |
* debugging, and tracking asynchronous activities. |
380 |
*/ |
381 |
public static interface AsynchronousCompletionTask { |
382 |
} |
383 |
|
384 |
/** Base class can act as either FJ or plain Runnable */ |
385 |
abstract static class Async extends ForkJoinTask<Void> |
386 |
implements Runnable, AsynchronousCompletionTask { |
387 |
public final Void getRawResult() { return null; } |
388 |
public final void setRawResult(Void v) { } |
389 |
public final void run() { exec(); } |
390 |
} |
391 |
|
392 |
static final class AsyncRun extends Async { |
393 |
final Runnable fn; |
394 |
final CompletableFuture<Void> dst; |
395 |
AsyncRun(Runnable fn, CompletableFuture<Void> dst) { |
396 |
this.fn = fn; this.dst = dst; |
397 |
} |
398 |
public final boolean exec() { |
399 |
CompletableFuture<Void> d; Throwable ex; |
400 |
if ((d = this.dst) != null && d.result == null) { |
401 |
try { |
402 |
fn.run(); |
403 |
ex = null; |
404 |
} catch (Throwable rex) { |
405 |
ex = rex; |
406 |
} |
407 |
d.internalComplete(null, ex); |
408 |
} |
409 |
return true; |
410 |
} |
411 |
private static final long serialVersionUID = 5232453952276885070L; |
412 |
} |
413 |
|
414 |
static final class AsyncSupply<U> extends Async { |
415 |
final Supplier<U> fn; |
416 |
final CompletableFuture<U> dst; |
417 |
AsyncSupply(Supplier<U> fn, CompletableFuture<U> dst) { |
418 |
this.fn = fn; this.dst = dst; |
419 |
} |
420 |
public final boolean exec() { |
421 |
CompletableFuture<U> d; U u; Throwable ex; |
422 |
if ((d = this.dst) != null && d.result == null) { |
423 |
try { |
424 |
u = fn.get(); |
425 |
ex = null; |
426 |
} catch (Throwable rex) { |
427 |
ex = rex; |
428 |
u = null; |
429 |
} |
430 |
d.internalComplete(u, ex); |
431 |
} |
432 |
return true; |
433 |
} |
434 |
private static final long serialVersionUID = 5232453952276885070L; |
435 |
} |
436 |
|
437 |
static final class AsyncApply<T,U> extends Async { |
438 |
final Function<? super T,? extends U> fn; |
439 |
final T arg; |
440 |
final CompletableFuture<U> dst; |
441 |
AsyncApply(T arg, Function<? super T,? extends U> fn, |
442 |
CompletableFuture<U> dst) { |
443 |
this.arg = arg; this.fn = fn; this.dst = dst; |
444 |
} |
445 |
public final boolean exec() { |
446 |
CompletableFuture<U> d; U u; Throwable ex; |
447 |
if ((d = this.dst) != null && d.result == null) { |
448 |
try { |
449 |
u = fn.apply(arg); |
450 |
ex = null; |
451 |
} catch (Throwable rex) { |
452 |
ex = rex; |
453 |
u = null; |
454 |
} |
455 |
d.internalComplete(u, ex); |
456 |
} |
457 |
return true; |
458 |
} |
459 |
private static final long serialVersionUID = 5232453952276885070L; |
460 |
} |
461 |
|
462 |
static final class AsyncBiApply<T,U,V> extends Async { |
463 |
final BiFunction<? super T,? super U,? extends V> fn; |
464 |
final T arg1; |
465 |
final U arg2; |
466 |
final CompletableFuture<V> dst; |
467 |
AsyncBiApply(T arg1, U arg2, |
468 |
BiFunction<? super T,? super U,? extends V> fn, |
469 |
CompletableFuture<V> dst) { |
470 |
this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; this.dst = dst; |
471 |
} |
472 |
public final boolean exec() { |
473 |
CompletableFuture<V> d; V v; Throwable ex; |
474 |
if ((d = this.dst) != null && d.result == null) { |
475 |
try { |
476 |
v = fn.apply(arg1, arg2); |
477 |
ex = null; |
478 |
} catch (Throwable rex) { |
479 |
ex = rex; |
480 |
v = null; |
481 |
} |
482 |
d.internalComplete(v, ex); |
483 |
} |
484 |
return true; |
485 |
} |
486 |
private static final long serialVersionUID = 5232453952276885070L; |
487 |
} |
488 |
|
489 |
static final class AsyncAccept<T> extends Async { |
490 |
final Consumer<? super T> fn; |
491 |
final T arg; |
492 |
final CompletableFuture<Void> dst; |
493 |
AsyncAccept(T arg, Consumer<? super T> fn, |
494 |
CompletableFuture<Void> dst) { |
495 |
this.arg = arg; this.fn = fn; this.dst = dst; |
496 |
} |
497 |
public final boolean exec() { |
498 |
CompletableFuture<Void> d; Throwable ex; |
499 |
if ((d = this.dst) != null && d.result == null) { |
500 |
try { |
501 |
fn.accept(arg); |
502 |
ex = null; |
503 |
} catch (Throwable rex) { |
504 |
ex = rex; |
505 |
} |
506 |
d.internalComplete(null, ex); |
507 |
} |
508 |
return true; |
509 |
} |
510 |
private static final long serialVersionUID = 5232453952276885070L; |
511 |
} |
512 |
|
513 |
static final class AsyncBiAccept<T,U> extends Async { |
514 |
final BiConsumer<? super T,? super U> fn; |
515 |
final T arg1; |
516 |
final U arg2; |
517 |
final CompletableFuture<Void> dst; |
518 |
AsyncBiAccept(T arg1, U arg2, |
519 |
BiConsumer<? super T,? super U> fn, |
520 |
CompletableFuture<Void> dst) { |
521 |
this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; this.dst = dst; |
522 |
} |
523 |
public final boolean exec() { |
524 |
CompletableFuture<Void> d; Throwable ex; |
525 |
if ((d = this.dst) != null && d.result == null) { |
526 |
try { |
527 |
fn.accept(arg1, arg2); |
528 |
ex = null; |
529 |
} catch (Throwable rex) { |
530 |
ex = rex; |
531 |
} |
532 |
d.internalComplete(null, ex); |
533 |
} |
534 |
return true; |
535 |
} |
536 |
private static final long serialVersionUID = 5232453952276885070L; |
537 |
} |
538 |
|
539 |
/* ------------- Completions -------------- */ |
540 |
|
541 |
/** |
542 |
* Simple linked list nodes to record completions, used in |
543 |
* basically the same way as WaitNodes. (We separate nodes from |
544 |
* the Completions themselves mainly because for the And and Or |
545 |
* methods, the same Completion object resides in two lists.) |
546 |
*/ |
547 |
static final class CompletionNode { |
548 |
final Completion completion; |
549 |
volatile CompletionNode next; |
550 |
CompletionNode(Completion completion) { this.completion = completion; } |
551 |
} |
552 |
|
553 |
// Opportunistically subclass AtomicInteger to use compareAndSet to claim. |
554 |
abstract static class Completion extends AtomicInteger implements Runnable { |
555 |
} |
556 |
|
557 |
static final class ApplyCompletion<T,U> extends Completion { |
558 |
final CompletableFuture<? extends T> src; |
559 |
final Function<? super T,? extends U> fn; |
560 |
final CompletableFuture<U> dst; |
561 |
final Executor executor; |
562 |
ApplyCompletion(CompletableFuture<? extends T> src, |
563 |
Function<? super T,? extends U> fn, |
564 |
CompletableFuture<U> dst, Executor executor) { |
565 |
this.src = src; this.fn = fn; this.dst = dst; |
566 |
this.executor = executor; |
567 |
} |
568 |
public final void run() { |
569 |
final CompletableFuture<? extends T> a; |
570 |
final Function<? super T,? extends U> fn; |
571 |
final CompletableFuture<U> dst; |
572 |
Object r; T t; Throwable ex; |
573 |
if ((dst = this.dst) != null && |
574 |
(fn = this.fn) != null && |
575 |
(a = this.src) != null && |
576 |
(r = a.result) != null && |
577 |
compareAndSet(0, 1)) { |
578 |
if (r instanceof AltResult) { |
579 |
ex = ((AltResult)r).ex; |
580 |
t = null; |
581 |
} |
582 |
else { |
583 |
ex = null; |
584 |
@SuppressWarnings("unchecked") T tr = (T) r; |
585 |
t = tr; |
586 |
} |
587 |
Executor e = executor; |
588 |
U u = null; |
589 |
if (ex == null) { |
590 |
try { |
591 |
if (e != null) |
592 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
593 |
else |
594 |
u = fn.apply(t); |
595 |
} catch (Throwable rex) { |
596 |
ex = rex; |
597 |
} |
598 |
} |
599 |
if (e == null || ex != null) |
600 |
dst.internalComplete(u, ex); |
601 |
} |
602 |
} |
603 |
private static final long serialVersionUID = 5232453952276885070L; |
604 |
} |
605 |
|
606 |
static final class AcceptCompletion<T> extends Completion { |
607 |
final CompletableFuture<? extends T> src; |
608 |
final Consumer<? super T> fn; |
609 |
final CompletableFuture<Void> dst; |
610 |
final Executor executor; |
611 |
AcceptCompletion(CompletableFuture<? extends T> src, |
612 |
Consumer<? super T> fn, |
613 |
CompletableFuture<Void> dst, Executor executor) { |
614 |
this.src = src; this.fn = fn; this.dst = dst; |
615 |
this.executor = executor; |
616 |
} |
617 |
public final void run() { |
618 |
final CompletableFuture<? extends T> a; |
619 |
final Consumer<? super T> fn; |
620 |
final CompletableFuture<Void> dst; |
621 |
Object r; T t; Throwable ex; |
622 |
if ((dst = this.dst) != null && |
623 |
(fn = this.fn) != null && |
624 |
(a = this.src) != null && |
625 |
(r = a.result) != null && |
626 |
compareAndSet(0, 1)) { |
627 |
if (r instanceof AltResult) { |
628 |
ex = ((AltResult)r).ex; |
629 |
t = null; |
630 |
} |
631 |
else { |
632 |
ex = null; |
633 |
@SuppressWarnings("unchecked") T tr = (T) r; |
634 |
t = tr; |
635 |
} |
636 |
Executor e = executor; |
637 |
if (ex == null) { |
638 |
try { |
639 |
if (e != null) |
640 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
641 |
else |
642 |
fn.accept(t); |
643 |
} catch (Throwable rex) { |
644 |
ex = rex; |
645 |
} |
646 |
} |
647 |
if (e == null || ex != null) |
648 |
dst.internalComplete(null, ex); |
649 |
} |
650 |
} |
651 |
private static final long serialVersionUID = 5232453952276885070L; |
652 |
} |
653 |
|
654 |
static final class RunCompletion<T> extends Completion { |
655 |
final CompletableFuture<? extends T> src; |
656 |
final Runnable fn; |
657 |
final CompletableFuture<Void> dst; |
658 |
final Executor executor; |
659 |
RunCompletion(CompletableFuture<? extends T> src, |
660 |
Runnable fn, |
661 |
CompletableFuture<Void> dst, |
662 |
Executor executor) { |
663 |
this.src = src; this.fn = fn; this.dst = dst; |
664 |
this.executor = executor; |
665 |
} |
666 |
public final void run() { |
667 |
final CompletableFuture<? extends T> a; |
668 |
final Runnable fn; |
669 |
final CompletableFuture<Void> dst; |
670 |
Object r; Throwable ex; |
671 |
if ((dst = this.dst) != null && |
672 |
(fn = this.fn) != null && |
673 |
(a = this.src) != null && |
674 |
(r = a.result) != null && |
675 |
compareAndSet(0, 1)) { |
676 |
if (r instanceof AltResult) |
677 |
ex = ((AltResult)r).ex; |
678 |
else |
679 |
ex = null; |
680 |
Executor e = executor; |
681 |
if (ex == null) { |
682 |
try { |
683 |
if (e != null) |
684 |
e.execute(new AsyncRun(fn, dst)); |
685 |
else |
686 |
fn.run(); |
687 |
} catch (Throwable rex) { |
688 |
ex = rex; |
689 |
} |
690 |
} |
691 |
if (e == null || ex != null) |
692 |
dst.internalComplete(null, ex); |
693 |
} |
694 |
} |
695 |
private static final long serialVersionUID = 5232453952276885070L; |
696 |
} |
697 |
|
698 |
static final class BiApplyCompletion<T,U,V> extends Completion { |
699 |
final CompletableFuture<? extends T> src; |
700 |
final CompletableFuture<? extends U> snd; |
701 |
final BiFunction<? super T,? super U,? extends V> fn; |
702 |
final CompletableFuture<V> dst; |
703 |
final Executor executor; |
704 |
BiApplyCompletion(CompletableFuture<? extends T> src, |
705 |
CompletableFuture<? extends U> snd, |
706 |
BiFunction<? super T,? super U,? extends V> fn, |
707 |
CompletableFuture<V> dst, Executor executor) { |
708 |
this.src = src; this.snd = snd; |
709 |
this.fn = fn; this.dst = dst; |
710 |
this.executor = executor; |
711 |
} |
712 |
public final void run() { |
713 |
final CompletableFuture<? extends T> a; |
714 |
final CompletableFuture<? extends U> b; |
715 |
final BiFunction<? super T,? super U,? extends V> fn; |
716 |
final CompletableFuture<V> dst; |
717 |
Object r, s; T t; U u; Throwable ex; |
718 |
if ((dst = this.dst) != null && |
719 |
(fn = this.fn) != null && |
720 |
(a = this.src) != null && |
721 |
(r = a.result) != null && |
722 |
(b = this.snd) != null && |
723 |
(s = b.result) != null && |
724 |
compareAndSet(0, 1)) { |
725 |
if (r instanceof AltResult) { |
726 |
ex = ((AltResult)r).ex; |
727 |
t = null; |
728 |
} |
729 |
else { |
730 |
ex = null; |
731 |
@SuppressWarnings("unchecked") T tr = (T) r; |
732 |
t = tr; |
733 |
} |
734 |
if (ex != null) |
735 |
u = null; |
736 |
else if (s instanceof AltResult) { |
737 |
ex = ((AltResult)s).ex; |
738 |
u = null; |
739 |
} |
740 |
else { |
741 |
@SuppressWarnings("unchecked") U us = (U) s; |
742 |
u = us; |
743 |
} |
744 |
Executor e = executor; |
745 |
V v = null; |
746 |
if (ex == null) { |
747 |
try { |
748 |
if (e != null) |
749 |
e.execute(new AsyncBiApply<T,U,V>(t, u, fn, dst)); |
750 |
else |
751 |
v = fn.apply(t, u); |
752 |
} catch (Throwable rex) { |
753 |
ex = rex; |
754 |
} |
755 |
} |
756 |
if (e == null || ex != null) |
757 |
dst.internalComplete(v, ex); |
758 |
} |
759 |
} |
760 |
private static final long serialVersionUID = 5232453952276885070L; |
761 |
} |
762 |
|
763 |
static final class BiAcceptCompletion<T,U> extends Completion { |
764 |
final CompletableFuture<? extends T> src; |
765 |
final CompletableFuture<? extends U> snd; |
766 |
final BiConsumer<? super T,? super U> fn; |
767 |
final CompletableFuture<Void> dst; |
768 |
final Executor executor; |
769 |
BiAcceptCompletion(CompletableFuture<? extends T> src, |
770 |
CompletableFuture<? extends U> snd, |
771 |
BiConsumer<? super T,? super U> fn, |
772 |
CompletableFuture<Void> dst, Executor executor) { |
773 |
this.src = src; this.snd = snd; |
774 |
this.fn = fn; this.dst = dst; |
775 |
this.executor = executor; |
776 |
} |
777 |
public final void run() { |
778 |
final CompletableFuture<? extends T> a; |
779 |
final CompletableFuture<? extends U> b; |
780 |
final BiConsumer<? super T,? super U> fn; |
781 |
final CompletableFuture<Void> dst; |
782 |
Object r, s; T t; U u; Throwable ex; |
783 |
if ((dst = this.dst) != null && |
784 |
(fn = this.fn) != null && |
785 |
(a = this.src) != null && |
786 |
(r = a.result) != null && |
787 |
(b = this.snd) != null && |
788 |
(s = b.result) != null && |
789 |
compareAndSet(0, 1)) { |
790 |
if (r instanceof AltResult) { |
791 |
ex = ((AltResult)r).ex; |
792 |
t = null; |
793 |
} |
794 |
else { |
795 |
ex = null; |
796 |
@SuppressWarnings("unchecked") T tr = (T) r; |
797 |
t = tr; |
798 |
} |
799 |
if (ex != null) |
800 |
u = null; |
801 |
else if (s instanceof AltResult) { |
802 |
ex = ((AltResult)s).ex; |
803 |
u = null; |
804 |
} |
805 |
else { |
806 |
@SuppressWarnings("unchecked") U us = (U) s; |
807 |
u = us; |
808 |
} |
809 |
Executor e = executor; |
810 |
if (ex == null) { |
811 |
try { |
812 |
if (e != null) |
813 |
e.execute(new AsyncBiAccept<T,U>(t, u, fn, dst)); |
814 |
else |
815 |
fn.accept(t, u); |
816 |
} catch (Throwable rex) { |
817 |
ex = rex; |
818 |
} |
819 |
} |
820 |
if (e == null || ex != null) |
821 |
dst.internalComplete(null, ex); |
822 |
} |
823 |
} |
824 |
private static final long serialVersionUID = 5232453952276885070L; |
825 |
} |
826 |
|
827 |
static final class BiRunCompletion<T> extends Completion { |
828 |
final CompletableFuture<? extends T> src; |
829 |
final CompletableFuture<?> snd; |
830 |
final Runnable fn; |
831 |
final CompletableFuture<Void> dst; |
832 |
final Executor executor; |
833 |
BiRunCompletion(CompletableFuture<? extends T> src, |
834 |
CompletableFuture<?> snd, |
835 |
Runnable fn, |
836 |
CompletableFuture<Void> dst, Executor executor) { |
837 |
this.src = src; this.snd = snd; |
838 |
this.fn = fn; this.dst = dst; |
839 |
this.executor = executor; |
840 |
} |
841 |
public final void run() { |
842 |
final CompletableFuture<? extends T> a; |
843 |
final CompletableFuture<?> b; |
844 |
final Runnable fn; |
845 |
final CompletableFuture<Void> dst; |
846 |
Object r, s; Throwable ex; |
847 |
if ((dst = this.dst) != null && |
848 |
(fn = this.fn) != null && |
849 |
(a = this.src) != null && |
850 |
(r = a.result) != null && |
851 |
(b = this.snd) != null && |
852 |
(s = b.result) != null && |
853 |
compareAndSet(0, 1)) { |
854 |
if (r instanceof AltResult) |
855 |
ex = ((AltResult)r).ex; |
856 |
else |
857 |
ex = null; |
858 |
if (ex == null && (s instanceof AltResult)) |
859 |
ex = ((AltResult)s).ex; |
860 |
Executor e = executor; |
861 |
if (ex == null) { |
862 |
try { |
863 |
if (e != null) |
864 |
e.execute(new AsyncRun(fn, dst)); |
865 |
else |
866 |
fn.run(); |
867 |
} catch (Throwable rex) { |
868 |
ex = rex; |
869 |
} |
870 |
} |
871 |
if (e == null || ex != null) |
872 |
dst.internalComplete(null, ex); |
873 |
} |
874 |
} |
875 |
private static final long serialVersionUID = 5232453952276885070L; |
876 |
} |
877 |
|
878 |
static final class AndCompletion extends Completion { |
879 |
final CompletableFuture<?> src; |
880 |
final CompletableFuture<?> snd; |
881 |
final CompletableFuture<Void> dst; |
882 |
AndCompletion(CompletableFuture<?> src, |
883 |
CompletableFuture<?> snd, |
884 |
CompletableFuture<Void> dst) { |
885 |
this.src = src; this.snd = snd; this.dst = dst; |
886 |
} |
887 |
public final void run() { |
888 |
final CompletableFuture<?> a; |
889 |
final CompletableFuture<?> b; |
890 |
final CompletableFuture<Void> dst; |
891 |
Object r, s; Throwable ex; |
892 |
if ((dst = this.dst) != null && |
893 |
(a = this.src) != null && |
894 |
(r = a.result) != null && |
895 |
(b = this.snd) != null && |
896 |
(s = b.result) != null && |
897 |
compareAndSet(0, 1)) { |
898 |
if (r instanceof AltResult) |
899 |
ex = ((AltResult)r).ex; |
900 |
else |
901 |
ex = null; |
902 |
if (ex == null && (s instanceof AltResult)) |
903 |
ex = ((AltResult)s).ex; |
904 |
dst.internalComplete(null, ex); |
905 |
} |
906 |
} |
907 |
private static final long serialVersionUID = 5232453952276885070L; |
908 |
} |
909 |
|
910 |
static final class OrApplyCompletion<T,U> extends Completion { |
911 |
final CompletableFuture<? extends T> src; |
912 |
final CompletableFuture<? extends T> snd; |
913 |
final Function<? super T,? extends U> fn; |
914 |
final CompletableFuture<U> dst; |
915 |
final Executor executor; |
916 |
OrApplyCompletion(CompletableFuture<? extends T> src, |
917 |
CompletableFuture<? extends T> snd, |
918 |
Function<? super T,? extends U> fn, |
919 |
CompletableFuture<U> dst, Executor executor) { |
920 |
this.src = src; this.snd = snd; |
921 |
this.fn = fn; this.dst = dst; |
922 |
this.executor = executor; |
923 |
} |
924 |
public final void run() { |
925 |
final CompletableFuture<? extends T> a; |
926 |
final CompletableFuture<? extends T> b; |
927 |
final Function<? super T,? extends U> fn; |
928 |
final CompletableFuture<U> dst; |
929 |
Object r; T t; Throwable ex; |
930 |
if ((dst = this.dst) != null && |
931 |
(fn = this.fn) != null && |
932 |
(((a = this.src) != null && (r = a.result) != null) || |
933 |
((b = this.snd) != null && (r = b.result) != null)) && |
934 |
compareAndSet(0, 1)) { |
935 |
if (r instanceof AltResult) { |
936 |
ex = ((AltResult)r).ex; |
937 |
t = null; |
938 |
} |
939 |
else { |
940 |
ex = null; |
941 |
@SuppressWarnings("unchecked") T tr = (T) r; |
942 |
t = tr; |
943 |
} |
944 |
Executor e = executor; |
945 |
U u = null; |
946 |
if (ex == null) { |
947 |
try { |
948 |
if (e != null) |
949 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
950 |
else |
951 |
u = fn.apply(t); |
952 |
} catch (Throwable rex) { |
953 |
ex = rex; |
954 |
} |
955 |
} |
956 |
if (e == null || ex != null) |
957 |
dst.internalComplete(u, ex); |
958 |
} |
959 |
} |
960 |
private static final long serialVersionUID = 5232453952276885070L; |
961 |
} |
962 |
|
963 |
static final class OrAcceptCompletion<T> extends Completion { |
964 |
final CompletableFuture<? extends T> src; |
965 |
final CompletableFuture<? extends T> snd; |
966 |
final Consumer<? super T> fn; |
967 |
final CompletableFuture<Void> dst; |
968 |
final Executor executor; |
969 |
OrAcceptCompletion(CompletableFuture<? extends T> src, |
970 |
CompletableFuture<? extends T> snd, |
971 |
Consumer<? super T> fn, |
972 |
CompletableFuture<Void> dst, Executor executor) { |
973 |
this.src = src; this.snd = snd; |
974 |
this.fn = fn; this.dst = dst; |
975 |
this.executor = executor; |
976 |
} |
977 |
public final void run() { |
978 |
final CompletableFuture<? extends T> a; |
979 |
final CompletableFuture<? extends T> b; |
980 |
final Consumer<? super T> fn; |
981 |
final CompletableFuture<Void> dst; |
982 |
Object r; T t; Throwable ex; |
983 |
if ((dst = this.dst) != null && |
984 |
(fn = this.fn) != null && |
985 |
(((a = this.src) != null && (r = a.result) != null) || |
986 |
((b = this.snd) != null && (r = b.result) != null)) && |
987 |
compareAndSet(0, 1)) { |
988 |
if (r instanceof AltResult) { |
989 |
ex = ((AltResult)r).ex; |
990 |
t = null; |
991 |
} |
992 |
else { |
993 |
ex = null; |
994 |
@SuppressWarnings("unchecked") T tr = (T) r; |
995 |
t = tr; |
996 |
} |
997 |
Executor e = executor; |
998 |
if (ex == null) { |
999 |
try { |
1000 |
if (e != null) |
1001 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
1002 |
else |
1003 |
fn.accept(t); |
1004 |
} catch (Throwable rex) { |
1005 |
ex = rex; |
1006 |
} |
1007 |
} |
1008 |
if (e == null || ex != null) |
1009 |
dst.internalComplete(null, ex); |
1010 |
} |
1011 |
} |
1012 |
private static final long serialVersionUID = 5232453952276885070L; |
1013 |
} |
1014 |
|
1015 |
static final class OrRunCompletion<T> extends Completion { |
1016 |
final CompletableFuture<? extends T> src; |
1017 |
final CompletableFuture<?> snd; |
1018 |
final Runnable fn; |
1019 |
final CompletableFuture<Void> dst; |
1020 |
final Executor executor; |
1021 |
OrRunCompletion(CompletableFuture<? extends T> src, |
1022 |
CompletableFuture<?> snd, |
1023 |
Runnable fn, |
1024 |
CompletableFuture<Void> dst, Executor executor) { |
1025 |
this.src = src; this.snd = snd; |
1026 |
this.fn = fn; this.dst = dst; |
1027 |
this.executor = executor; |
1028 |
} |
1029 |
public final void run() { |
1030 |
final CompletableFuture<? extends T> a; |
1031 |
final CompletableFuture<?> b; |
1032 |
final Runnable fn; |
1033 |
final CompletableFuture<Void> dst; |
1034 |
Object r; Throwable ex; |
1035 |
if ((dst = this.dst) != null && |
1036 |
(fn = this.fn) != null && |
1037 |
(((a = this.src) != null && (r = a.result) != null) || |
1038 |
((b = this.snd) != null && (r = b.result) != null)) && |
1039 |
compareAndSet(0, 1)) { |
1040 |
if (r instanceof AltResult) |
1041 |
ex = ((AltResult)r).ex; |
1042 |
else |
1043 |
ex = null; |
1044 |
Executor e = executor; |
1045 |
if (ex == null) { |
1046 |
try { |
1047 |
if (e != null) |
1048 |
e.execute(new AsyncRun(fn, dst)); |
1049 |
else |
1050 |
fn.run(); |
1051 |
} catch (Throwable rex) { |
1052 |
ex = rex; |
1053 |
} |
1054 |
} |
1055 |
if (e == null || ex != null) |
1056 |
dst.internalComplete(null, ex); |
1057 |
} |
1058 |
} |
1059 |
private static final long serialVersionUID = 5232453952276885070L; |
1060 |
} |
1061 |
|
1062 |
static final class OrCompletion extends Completion { |
1063 |
final CompletableFuture<?> src; |
1064 |
final CompletableFuture<?> snd; |
1065 |
final CompletableFuture<?> dst; |
1066 |
OrCompletion(CompletableFuture<?> src, |
1067 |
CompletableFuture<?> snd, |
1068 |
CompletableFuture<?> dst) { |
1069 |
this.src = src; this.snd = snd; this.dst = dst; |
1070 |
} |
1071 |
public final void run() { |
1072 |
final CompletableFuture<?> a; |
1073 |
final CompletableFuture<?> b; |
1074 |
final CompletableFuture<?> dst; |
1075 |
Object r, t; Throwable ex; |
1076 |
if ((dst = this.dst) != null && |
1077 |
(((a = this.src) != null && (r = a.result) != null) || |
1078 |
((b = this.snd) != null && (r = b.result) != null)) && |
1079 |
compareAndSet(0, 1)) { |
1080 |
if (r instanceof AltResult) { |
1081 |
ex = ((AltResult)r).ex; |
1082 |
t = null; |
1083 |
} |
1084 |
else { |
1085 |
ex = null; |
1086 |
t = r; |
1087 |
} |
1088 |
dst.internalComplete(t, ex); |
1089 |
} |
1090 |
} |
1091 |
private static final long serialVersionUID = 5232453952276885070L; |
1092 |
} |
1093 |
|
1094 |
static final class ExceptionCompletion<T> extends Completion { |
1095 |
final CompletableFuture<? extends T> src; |
1096 |
final Function<? super Throwable, ? extends T> fn; |
1097 |
final CompletableFuture<T> dst; |
1098 |
ExceptionCompletion(CompletableFuture<? extends T> src, |
1099 |
Function<? super Throwable, ? extends T> fn, |
1100 |
CompletableFuture<T> dst) { |
1101 |
this.src = src; this.fn = fn; this.dst = dst; |
1102 |
} |
1103 |
public final void run() { |
1104 |
final CompletableFuture<? extends T> a; |
1105 |
final Function<? super Throwable, ? extends T> fn; |
1106 |
final CompletableFuture<T> dst; |
1107 |
Object r; T t = null; Throwable ex, dx = null; |
1108 |
if ((dst = this.dst) != null && |
1109 |
(fn = this.fn) != null && |
1110 |
(a = this.src) != null && |
1111 |
(r = a.result) != null && |
1112 |
compareAndSet(0, 1)) { |
1113 |
if ((r instanceof AltResult) && |
1114 |
(ex = ((AltResult)r).ex) != null) { |
1115 |
try { |
1116 |
t = fn.apply(ex); |
1117 |
} catch (Throwable rex) { |
1118 |
dx = rex; |
1119 |
} |
1120 |
} |
1121 |
else { |
1122 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1123 |
t = tr; |
1124 |
} |
1125 |
dst.internalComplete(t, dx); |
1126 |
} |
1127 |
} |
1128 |
private static final long serialVersionUID = 5232453952276885070L; |
1129 |
} |
1130 |
|
1131 |
static final class ThenCopy extends Completion { |
1132 |
final CompletableFuture<?> src; |
1133 |
final CompletableFuture<?> dst; |
1134 |
ThenCopy(CompletableFuture<?> src, |
1135 |
CompletableFuture<?> dst) { |
1136 |
this.src = src; this.dst = dst; |
1137 |
} |
1138 |
public final void run() { |
1139 |
final CompletableFuture<?> a; |
1140 |
final CompletableFuture<?> dst; |
1141 |
Object r; Object t; Throwable ex; |
1142 |
if ((dst = this.dst) != null && |
1143 |
(a = this.src) != null && |
1144 |
(r = a.result) != null && |
1145 |
compareAndSet(0, 1)) { |
1146 |
if (r instanceof AltResult) { |
1147 |
ex = ((AltResult)r).ex; |
1148 |
t = null; |
1149 |
} |
1150 |
else { |
1151 |
ex = null; |
1152 |
t = r; |
1153 |
} |
1154 |
dst.internalComplete(t, ex); |
1155 |
} |
1156 |
} |
1157 |
private static final long serialVersionUID = 5232453952276885070L; |
1158 |
} |
1159 |
|
1160 |
static final class HandleCompletion<T,U> extends Completion { |
1161 |
final CompletableFuture<? extends T> src; |
1162 |
final BiFunction<? super T, Throwable, ? extends U> fn; |
1163 |
final CompletableFuture<U> dst; |
1164 |
HandleCompletion(CompletableFuture<? extends T> src, |
1165 |
BiFunction<? super T, Throwable, ? extends U> fn, |
1166 |
final CompletableFuture<U> dst) { |
1167 |
this.src = src; this.fn = fn; this.dst = dst; |
1168 |
} |
1169 |
public final void run() { |
1170 |
final CompletableFuture<? extends T> a; |
1171 |
final BiFunction<? super T, Throwable, ? extends U> fn; |
1172 |
final CompletableFuture<U> dst; |
1173 |
Object r; T t; Throwable ex; |
1174 |
if ((dst = this.dst) != null && |
1175 |
(fn = this.fn) != null && |
1176 |
(a = this.src) != null && |
1177 |
(r = a.result) != null && |
1178 |
compareAndSet(0, 1)) { |
1179 |
if (r instanceof AltResult) { |
1180 |
ex = ((AltResult)r).ex; |
1181 |
t = null; |
1182 |
} |
1183 |
else { |
1184 |
ex = null; |
1185 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1186 |
t = tr; |
1187 |
} |
1188 |
U u = null; Throwable dx = null; |
1189 |
try { |
1190 |
u = fn.apply(t, ex); |
1191 |
} catch (Throwable rex) { |
1192 |
dx = rex; |
1193 |
} |
1194 |
dst.internalComplete(u, dx); |
1195 |
} |
1196 |
} |
1197 |
private static final long serialVersionUID = 5232453952276885070L; |
1198 |
} |
1199 |
|
1200 |
static final class ComposeCompletion<T,U> extends Completion { |
1201 |
final CompletableFuture<? extends T> src; |
1202 |
final Function<? super T, CompletableFuture<U>> fn; |
1203 |
final CompletableFuture<U> dst; |
1204 |
ComposeCompletion(CompletableFuture<? extends T> src, |
1205 |
Function<? super T, CompletableFuture<U>> fn, |
1206 |
final CompletableFuture<U> dst) { |
1207 |
this.src = src; this.fn = fn; this.dst = dst; |
1208 |
} |
1209 |
public final void run() { |
1210 |
final CompletableFuture<? extends T> a; |
1211 |
final Function<? super T, CompletableFuture<U>> fn; |
1212 |
final CompletableFuture<U> dst; |
1213 |
Object r; T t; Throwable ex; |
1214 |
if ((dst = this.dst) != null && |
1215 |
(fn = this.fn) != null && |
1216 |
(a = this.src) != null && |
1217 |
(r = a.result) != null && |
1218 |
compareAndSet(0, 1)) { |
1219 |
if (r instanceof AltResult) { |
1220 |
ex = ((AltResult)r).ex; |
1221 |
t = null; |
1222 |
} |
1223 |
else { |
1224 |
ex = null; |
1225 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1226 |
t = tr; |
1227 |
} |
1228 |
CompletableFuture<U> c = null; |
1229 |
U u = null; |
1230 |
boolean complete = false; |
1231 |
if (ex == null) { |
1232 |
try { |
1233 |
c = fn.apply(t); |
1234 |
} catch (Throwable rex) { |
1235 |
ex = rex; |
1236 |
} |
1237 |
} |
1238 |
if (ex != null || c == null) { |
1239 |
if (ex == null) |
1240 |
ex = new NullPointerException(); |
1241 |
} |
1242 |
else { |
1243 |
ThenCopy d = null; |
1244 |
Object s; |
1245 |
if ((s = c.result) == null) { |
1246 |
CompletionNode p = new CompletionNode |
1247 |
(d = new ThenCopy(c, dst)); |
1248 |
while ((s = c.result) == null) { |
1249 |
if (UNSAFE.compareAndSwapObject |
1250 |
(c, COMPLETIONS, p.next = c.completions, p)) |
1251 |
break; |
1252 |
} |
1253 |
} |
1254 |
if (s != null && (d == null || d.compareAndSet(0, 1))) { |
1255 |
complete = true; |
1256 |
if (s instanceof AltResult) { |
1257 |
ex = ((AltResult)s).ex; // no rewrap |
1258 |
u = null; |
1259 |
} |
1260 |
else { |
1261 |
@SuppressWarnings("unchecked") U us = (U) s; |
1262 |
u = us; |
1263 |
} |
1264 |
} |
1265 |
} |
1266 |
if (complete || ex != null) |
1267 |
dst.internalComplete(u, ex); |
1268 |
if (c != null) |
1269 |
c.helpPostComplete(); |
1270 |
} |
1271 |
} |
1272 |
private static final long serialVersionUID = 5232453952276885070L; |
1273 |
} |
1274 |
|
1275 |
// public methods |
1276 |
|
1277 |
/** |
1278 |
* Creates a new incomplete CompletableFuture. |
1279 |
*/ |
1280 |
public CompletableFuture() { |
1281 |
} |
1282 |
|
1283 |
/** |
1284 |
* Asynchronously executes in the {@link |
1285 |
* ForkJoinPool#commonPool()}, a task that completes the returned |
1286 |
* CompletableFuture with the result of the given Supplier. |
1287 |
* |
1288 |
* @param supplier a function returning the value to be used |
1289 |
* to complete the returned CompletableFuture |
1290 |
* @return the CompletableFuture |
1291 |
*/ |
1292 |
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier) { |
1293 |
if (supplier == null) throw new NullPointerException(); |
1294 |
CompletableFuture<U> f = new CompletableFuture<U>(); |
1295 |
ForkJoinPool.commonPool(). |
1296 |
execute((ForkJoinTask<?>)new AsyncSupply<U>(supplier, f)); |
1297 |
return f; |
1298 |
} |
1299 |
|
1300 |
/** |
1301 |
* Asynchronously executes using the given executor, a task that |
1302 |
* completes the returned CompletableFuture with the result of the |
1303 |
* given Supplier. |
1304 |
* |
1305 |
* @param supplier a function returning the value to be used |
1306 |
* to complete the returned CompletableFuture |
1307 |
* @param executor the executor to use for asynchronous execution |
1308 |
* @return the CompletableFuture |
1309 |
*/ |
1310 |
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier, |
1311 |
Executor executor) { |
1312 |
if (executor == null || supplier == null) |
1313 |
throw new NullPointerException(); |
1314 |
CompletableFuture<U> f = new CompletableFuture<U>(); |
1315 |
executor.execute(new AsyncSupply<U>(supplier, f)); |
1316 |
return f; |
1317 |
} |
1318 |
|
1319 |
/** |
1320 |
* Asynchronously executes in the {@link |
1321 |
* ForkJoinPool#commonPool()} a task that runs the given action, |
1322 |
* and then completes the returned CompletableFuture. |
1323 |
* |
1324 |
* @param runnable the action to run before completing the |
1325 |
* returned CompletableFuture |
1326 |
* @return the CompletableFuture |
1327 |
*/ |
1328 |
public static CompletableFuture<Void> runAsync(Runnable runnable) { |
1329 |
if (runnable == null) throw new NullPointerException(); |
1330 |
CompletableFuture<Void> f = new CompletableFuture<Void>(); |
1331 |
ForkJoinPool.commonPool(). |
1332 |
execute((ForkJoinTask<?>)new AsyncRun(runnable, f)); |
1333 |
return f; |
1334 |
} |
1335 |
|
1336 |
/** |
1337 |
* Asynchronously executes using the given executor, a task that |
1338 |
* runs the given action, and then completes the returned |
1339 |
* CompletableFuture. |
1340 |
* |
1341 |
* @param runnable the action to run before completing the |
1342 |
* returned CompletableFuture |
1343 |
* @param executor the executor to use for asynchronous execution |
1344 |
* @return the CompletableFuture |
1345 |
*/ |
1346 |
public static CompletableFuture<Void> runAsync(Runnable runnable, |
1347 |
Executor executor) { |
1348 |
if (executor == null || runnable == null) |
1349 |
throw new NullPointerException(); |
1350 |
CompletableFuture<Void> f = new CompletableFuture<Void>(); |
1351 |
executor.execute(new AsyncRun(runnable, f)); |
1352 |
return f; |
1353 |
} |
1354 |
|
1355 |
/** |
1356 |
* Returns {@code true} if completed in any fashion: normally, |
1357 |
* exceptionally, or via cancellation. |
1358 |
* |
1359 |
* @return {@code true} if completed |
1360 |
*/ |
1361 |
public boolean isDone() { |
1362 |
return result != null; |
1363 |
} |
1364 |
|
1365 |
/** |
1366 |
* Waits if necessary for the computation to complete, and then |
1367 |
* retrieves its result. |
1368 |
* |
1369 |
* @return the computed result |
1370 |
* @throws CancellationException if the computation was cancelled |
1371 |
* @throws ExecutionException if the computation threw an |
1372 |
* exception |
1373 |
* @throws InterruptedException if the current thread was interrupted |
1374 |
* while waiting |
1375 |
*/ |
1376 |
public T get() throws InterruptedException, ExecutionException { |
1377 |
Object r; Throwable ex, cause; |
1378 |
if ((r = result) == null && (r = waitingGet(true)) == null) |
1379 |
throw new InterruptedException(); |
1380 |
if (r instanceof AltResult) { |
1381 |
if ((ex = ((AltResult)r).ex) != null) { |
1382 |
if (ex instanceof CancellationException) |
1383 |
throw (CancellationException)ex; |
1384 |
if ((ex instanceof CompletionException) && |
1385 |
(cause = ex.getCause()) != null) |
1386 |
ex = cause; |
1387 |
throw new ExecutionException(ex); |
1388 |
} |
1389 |
return null; |
1390 |
} |
1391 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1392 |
return tr; |
1393 |
} |
1394 |
|
1395 |
/** |
1396 |
* Waits if necessary for at most the given time for completion, |
1397 |
* and then retrieves its result, if available. |
1398 |
* |
1399 |
* @param timeout the maximum time to wait |
1400 |
* @param unit the time unit of the timeout argument |
1401 |
* @return the computed result |
1402 |
* @throws CancellationException if the computation was cancelled |
1403 |
* @throws ExecutionException if the computation threw an |
1404 |
* exception |
1405 |
* @throws InterruptedException if the current thread was interrupted |
1406 |
* while waiting |
1407 |
* @throws TimeoutException if the wait timed out |
1408 |
*/ |
1409 |
public T get(long timeout, TimeUnit unit) |
1410 |
throws InterruptedException, ExecutionException, TimeoutException { |
1411 |
Object r; Throwable ex, cause; |
1412 |
long nanos = unit.toNanos(timeout); |
1413 |
if (Thread.interrupted()) |
1414 |
throw new InterruptedException(); |
1415 |
if ((r = result) == null) |
1416 |
r = timedAwaitDone(nanos); |
1417 |
if (r instanceof AltResult) { |
1418 |
if ((ex = ((AltResult)r).ex) != null) { |
1419 |
if (ex instanceof CancellationException) |
1420 |
throw (CancellationException)ex; |
1421 |
if ((ex instanceof CompletionException) && |
1422 |
(cause = ex.getCause()) != null) |
1423 |
ex = cause; |
1424 |
throw new ExecutionException(ex); |
1425 |
} |
1426 |
return null; |
1427 |
} |
1428 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1429 |
return tr; |
1430 |
} |
1431 |
|
1432 |
/** |
1433 |
* Returns the result value when complete, or throws an |
1434 |
* (unchecked) exception if completed exceptionally. To better |
1435 |
* conform with the use of common functional forms, if a |
1436 |
* computation involved in the completion of this |
1437 |
* CompletableFuture threw an exception, this method throws an |
1438 |
* (unchecked) {@link CompletionException} with the underlying |
1439 |
* exception as its cause. |
1440 |
* |
1441 |
* @return the result value |
1442 |
* @throws CancellationException if the computation was cancelled |
1443 |
* @throws CompletionException if a completion computation threw |
1444 |
* an exception |
1445 |
*/ |
1446 |
public T join() { |
1447 |
Object r; Throwable ex; |
1448 |
if ((r = result) == null) |
1449 |
r = waitingGet(false); |
1450 |
if (r instanceof AltResult) { |
1451 |
if ((ex = ((AltResult)r).ex) != null) { |
1452 |
if (ex instanceof CancellationException) |
1453 |
throw (CancellationException)ex; |
1454 |
if (ex instanceof CompletionException) |
1455 |
throw (CompletionException)ex; |
1456 |
throw new CompletionException(ex); |
1457 |
} |
1458 |
return null; |
1459 |
} |
1460 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1461 |
return tr; |
1462 |
} |
1463 |
|
1464 |
/** |
1465 |
* Returns the result value (or throws any encountered exception) |
1466 |
* if completed, else returns the given valueIfAbsent. |
1467 |
* |
1468 |
* @param valueIfAbsent the value to return if not completed |
1469 |
* @return the result value, if completed, else the given valueIfAbsent |
1470 |
* @throws CancellationException if the computation was cancelled |
1471 |
* @throws CompletionException if a completion computation threw |
1472 |
* an exception |
1473 |
*/ |
1474 |
public T getNow(T valueIfAbsent) { |
1475 |
Object r; Throwable ex; |
1476 |
if ((r = result) == null) |
1477 |
return valueIfAbsent; |
1478 |
if (r instanceof AltResult) { |
1479 |
if ((ex = ((AltResult)r).ex) != null) { |
1480 |
if (ex instanceof CancellationException) |
1481 |
throw (CancellationException)ex; |
1482 |
if (ex instanceof CompletionException) |
1483 |
throw (CompletionException)ex; |
1484 |
throw new CompletionException(ex); |
1485 |
} |
1486 |
return null; |
1487 |
} |
1488 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1489 |
return tr; |
1490 |
} |
1491 |
|
1492 |
/** |
1493 |
* If not already completed, sets the value returned by {@link |
1494 |
* #get()} and related methods to the given value. |
1495 |
* |
1496 |
* @param value the result value |
1497 |
* @return {@code true} if this invocation caused this CompletableFuture |
1498 |
* to transition to a completed state, else {@code false} |
1499 |
*/ |
1500 |
public boolean complete(T value) { |
1501 |
boolean triggered = result == null && |
1502 |
UNSAFE.compareAndSwapObject(this, RESULT, null, |
1503 |
value == null ? NIL : value); |
1504 |
postComplete(); |
1505 |
return triggered; |
1506 |
} |
1507 |
|
1508 |
/** |
1509 |
* If not already completed, causes invocations of {@link #get()} |
1510 |
* and related methods to throw the given exception. |
1511 |
* |
1512 |
* @param ex the exception |
1513 |
* @return {@code true} if this invocation caused this CompletableFuture |
1514 |
* to transition to a completed state, else {@code false} |
1515 |
*/ |
1516 |
public boolean completeExceptionally(Throwable ex) { |
1517 |
if (ex == null) throw new NullPointerException(); |
1518 |
boolean triggered = result == null && |
1519 |
UNSAFE.compareAndSwapObject(this, RESULT, null, new AltResult(ex)); |
1520 |
postComplete(); |
1521 |
return triggered; |
1522 |
} |
1523 |
|
1524 |
/** |
1525 |
* Creates and returns a CompletableFuture that is completed with |
1526 |
* the result of the given function of this CompletableFuture. |
1527 |
* If this CompletableFuture completes exceptionally, |
1528 |
* then the returned CompletableFuture also does so, |
1529 |
* with a CompletionException holding this exception as |
1530 |
* its cause. |
1531 |
* |
1532 |
* @param fn the function to use to compute the value of |
1533 |
* the returned CompletableFuture |
1534 |
* @return the new CompletableFuture |
1535 |
*/ |
1536 |
public <U> CompletableFuture<U> thenApply(Function<? super T,? extends U> fn) { |
1537 |
return doThenApply(fn, null); |
1538 |
} |
1539 |
|
1540 |
/** |
1541 |
* Creates and returns a CompletableFuture that is asynchronously |
1542 |
* completed using the {@link ForkJoinPool#commonPool()} with the |
1543 |
* result of the given function of this CompletableFuture. If |
1544 |
* this CompletableFuture completes exceptionally, then the |
1545 |
* returned CompletableFuture also does so, with a |
1546 |
* CompletionException holding this exception as its cause. |
1547 |
* |
1548 |
* @param fn the function to use to compute the value of |
1549 |
* the returned CompletableFuture |
1550 |
* @return the new CompletableFuture |
1551 |
*/ |
1552 |
public <U> CompletableFuture<U> thenApplyAsync(Function<? super T,? extends U> fn) { |
1553 |
return doThenApply(fn, ForkJoinPool.commonPool()); |
1554 |
} |
1555 |
|
1556 |
/** |
1557 |
* Creates and returns a CompletableFuture that is asynchronously |
1558 |
* completed using the given executor with the result of the given |
1559 |
* function of this CompletableFuture. If this CompletableFuture |
1560 |
* completes exceptionally, then the returned CompletableFuture |
1561 |
* also does so, with a CompletionException holding this exception as |
1562 |
* its cause. |
1563 |
* |
1564 |
* @param fn the function to use to compute the value of |
1565 |
* the returned CompletableFuture |
1566 |
* @param executor the executor to use for asynchronous execution |
1567 |
* @return the new CompletableFuture |
1568 |
*/ |
1569 |
public <U> CompletableFuture<U> thenApplyAsync(Function<? super T,? extends U> fn, |
1570 |
Executor executor) { |
1571 |
if (executor == null) throw new NullPointerException(); |
1572 |
return doThenApply(fn, executor); |
1573 |
} |
1574 |
|
1575 |
private <U> CompletableFuture<U> doThenApply(Function<? super T,? extends U> fn, |
1576 |
Executor e) { |
1577 |
if (fn == null) throw new NullPointerException(); |
1578 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
1579 |
ApplyCompletion<T,U> d = null; |
1580 |
Object r; |
1581 |
if ((r = result) == null) { |
1582 |
CompletionNode p = new CompletionNode |
1583 |
(d = new ApplyCompletion<T,U>(this, fn, dst, e)); |
1584 |
while ((r = result) == null) { |
1585 |
if (UNSAFE.compareAndSwapObject |
1586 |
(this, COMPLETIONS, p.next = completions, p)) |
1587 |
break; |
1588 |
} |
1589 |
} |
1590 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1591 |
T t; Throwable ex; |
1592 |
if (r instanceof AltResult) { |
1593 |
ex = ((AltResult)r).ex; |
1594 |
t = null; |
1595 |
} |
1596 |
else { |
1597 |
ex = null; |
1598 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1599 |
t = tr; |
1600 |
} |
1601 |
U u = null; |
1602 |
if (ex == null) { |
1603 |
try { |
1604 |
if (e != null) |
1605 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
1606 |
else |
1607 |
u = fn.apply(t); |
1608 |
} catch (Throwable rex) { |
1609 |
ex = rex; |
1610 |
} |
1611 |
} |
1612 |
if (e == null || ex != null) |
1613 |
dst.internalComplete(u, ex); |
1614 |
} |
1615 |
helpPostComplete(); |
1616 |
return dst; |
1617 |
} |
1618 |
|
1619 |
/** |
1620 |
* Creates and returns a CompletableFuture that is completed after |
1621 |
* performing the given action with this CompletableFuture's |
1622 |
* result when it completes. If this CompletableFuture |
1623 |
* completes exceptionally, then the returned CompletableFuture |
1624 |
* also does so, with a CompletionException holding this exception as |
1625 |
* its cause. |
1626 |
* |
1627 |
* @param block the action to perform before completing the |
1628 |
* returned CompletableFuture |
1629 |
* @return the new CompletableFuture |
1630 |
*/ |
1631 |
public CompletableFuture<Void> thenAccept(Consumer<? super T> block) { |
1632 |
return doThenAccept(block, null); |
1633 |
} |
1634 |
|
1635 |
/** |
1636 |
* Creates and returns a CompletableFuture that is asynchronously |
1637 |
* completed using the {@link ForkJoinPool#commonPool()} with this |
1638 |
* CompletableFuture's result when it completes. If this |
1639 |
* CompletableFuture completes exceptionally, then the returned |
1640 |
* CompletableFuture also does so, with a CompletionException holding |
1641 |
* this exception as its cause. |
1642 |
* |
1643 |
* @param block the action to perform before completing the |
1644 |
* returned CompletableFuture |
1645 |
* @return the new CompletableFuture |
1646 |
*/ |
1647 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> block) { |
1648 |
return doThenAccept(block, ForkJoinPool.commonPool()); |
1649 |
} |
1650 |
|
1651 |
/** |
1652 |
* Creates and returns a CompletableFuture that is asynchronously |
1653 |
* completed using the given executor with this |
1654 |
* CompletableFuture's result when it completes. If this |
1655 |
* CompletableFuture completes exceptionally, then the returned |
1656 |
* CompletableFuture also does so, with a CompletionException holding |
1657 |
* this exception as its cause. |
1658 |
* |
1659 |
* @param block the action to perform before completing the |
1660 |
* returned CompletableFuture |
1661 |
* @param executor the executor to use for asynchronous execution |
1662 |
* @return the new CompletableFuture |
1663 |
*/ |
1664 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> block, |
1665 |
Executor executor) { |
1666 |
if (executor == null) throw new NullPointerException(); |
1667 |
return doThenAccept(block, executor); |
1668 |
} |
1669 |
|
1670 |
private CompletableFuture<Void> doThenAccept(Consumer<? super T> fn, |
1671 |
Executor e) { |
1672 |
if (fn == null) throw new NullPointerException(); |
1673 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1674 |
AcceptCompletion<T> d = null; |
1675 |
Object r; |
1676 |
if ((r = result) == null) { |
1677 |
CompletionNode p = new CompletionNode |
1678 |
(d = new AcceptCompletion<T>(this, fn, dst, e)); |
1679 |
while ((r = result) == null) { |
1680 |
if (UNSAFE.compareAndSwapObject |
1681 |
(this, COMPLETIONS, p.next = completions, p)) |
1682 |
break; |
1683 |
} |
1684 |
} |
1685 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1686 |
T t; Throwable ex; |
1687 |
if (r instanceof AltResult) { |
1688 |
ex = ((AltResult)r).ex; |
1689 |
t = null; |
1690 |
} |
1691 |
else { |
1692 |
ex = null; |
1693 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1694 |
t = tr; |
1695 |
} |
1696 |
if (ex == null) { |
1697 |
try { |
1698 |
if (e != null) |
1699 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
1700 |
else |
1701 |
fn.accept(t); |
1702 |
} catch (Throwable rex) { |
1703 |
ex = rex; |
1704 |
} |
1705 |
} |
1706 |
if (e == null || ex != null) |
1707 |
dst.internalComplete(null, ex); |
1708 |
} |
1709 |
helpPostComplete(); |
1710 |
return dst; |
1711 |
} |
1712 |
|
1713 |
/** |
1714 |
* Creates and returns a CompletableFuture that is completed after |
1715 |
* performing the given action when this CompletableFuture |
1716 |
* completes. If this CompletableFuture completes exceptionally, |
1717 |
* then the returned CompletableFuture also does so, with a |
1718 |
* CompletionException holding this exception as its cause. |
1719 |
* |
1720 |
* @param action the action to perform before completing the |
1721 |
* returned CompletableFuture |
1722 |
* @return the new CompletableFuture |
1723 |
*/ |
1724 |
public CompletableFuture<Void> thenRun(Runnable action) { |
1725 |
return doThenRun(action, null); |
1726 |
} |
1727 |
|
1728 |
/** |
1729 |
* Creates and returns a CompletableFuture that is asynchronously |
1730 |
* completed using the {@link ForkJoinPool#commonPool()} after |
1731 |
* performing the given action when this CompletableFuture |
1732 |
* completes. If this CompletableFuture completes exceptionally, |
1733 |
* then the returned CompletableFuture also does so, with a |
1734 |
* CompletionException holding this exception as its cause. |
1735 |
* |
1736 |
* @param action the action to perform before completing the |
1737 |
* returned CompletableFuture |
1738 |
* @return the new CompletableFuture |
1739 |
*/ |
1740 |
public CompletableFuture<Void> thenRunAsync(Runnable action) { |
1741 |
return doThenRun(action, ForkJoinPool.commonPool()); |
1742 |
} |
1743 |
|
1744 |
/** |
1745 |
* Creates and returns a CompletableFuture that is asynchronously |
1746 |
* completed using the given executor after performing the given |
1747 |
* action when this CompletableFuture completes. If this |
1748 |
* CompletableFuture completes exceptionally, then the returned |
1749 |
* CompletableFuture also does so, with a CompletionException holding |
1750 |
* this exception as its cause. |
1751 |
* |
1752 |
* @param action the action to perform before completing the |
1753 |
* returned CompletableFuture |
1754 |
* @param executor the executor to use for asynchronous execution |
1755 |
* @return the new CompletableFuture |
1756 |
*/ |
1757 |
public CompletableFuture<Void> thenRunAsync(Runnable action, |
1758 |
Executor executor) { |
1759 |
if (executor == null) throw new NullPointerException(); |
1760 |
return doThenRun(action, executor); |
1761 |
} |
1762 |
|
1763 |
private CompletableFuture<Void> doThenRun(Runnable action, |
1764 |
Executor e) { |
1765 |
if (action == null) throw new NullPointerException(); |
1766 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1767 |
RunCompletion<T> d = null; |
1768 |
Object r; |
1769 |
if ((r = result) == null) { |
1770 |
CompletionNode p = new CompletionNode |
1771 |
(d = new RunCompletion<T>(this, action, dst, e)); |
1772 |
while ((r = result) == null) { |
1773 |
if (UNSAFE.compareAndSwapObject |
1774 |
(this, COMPLETIONS, p.next = completions, p)) |
1775 |
break; |
1776 |
} |
1777 |
} |
1778 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1779 |
Throwable ex; |
1780 |
if (r instanceof AltResult) |
1781 |
ex = ((AltResult)r).ex; |
1782 |
else |
1783 |
ex = null; |
1784 |
if (ex == null) { |
1785 |
try { |
1786 |
if (e != null) |
1787 |
e.execute(new AsyncRun(action, dst)); |
1788 |
else |
1789 |
action.run(); |
1790 |
} catch (Throwable rex) { |
1791 |
ex = rex; |
1792 |
} |
1793 |
} |
1794 |
if (e == null || ex != null) |
1795 |
dst.internalComplete(null, ex); |
1796 |
} |
1797 |
helpPostComplete(); |
1798 |
return dst; |
1799 |
} |
1800 |
|
1801 |
/** |
1802 |
* Creates and returns a CompletableFuture that is completed with |
1803 |
* the result of the given function of this and the other given |
1804 |
* CompletableFuture's results when both complete. If this or |
1805 |
* the other CompletableFuture complete exceptionally, then the |
1806 |
* returned CompletableFuture also does so, with a |
1807 |
* CompletionException holding the exception as its cause. |
1808 |
* |
1809 |
* @param other the other CompletableFuture |
1810 |
* @param fn the function to use to compute the value of |
1811 |
* the returned CompletableFuture |
1812 |
* @return the new CompletableFuture |
1813 |
*/ |
1814 |
public <U,V> CompletableFuture<V> thenCombine(CompletableFuture<? extends U> other, |
1815 |
BiFunction<? super T,? super U,? extends V> fn) { |
1816 |
return doThenBiApply(other, fn, null); |
1817 |
} |
1818 |
|
1819 |
/** |
1820 |
* Creates and returns a CompletableFuture that is asynchronously |
1821 |
* completed using the {@link ForkJoinPool#commonPool()} with |
1822 |
* the result of the given function of this and the other given |
1823 |
* CompletableFuture's results when both complete. If this or |
1824 |
* the other CompletableFuture complete exceptionally, then the |
1825 |
* returned CompletableFuture also does so, with a |
1826 |
* CompletionException holding the exception as its cause. |
1827 |
* |
1828 |
* @param other the other CompletableFuture |
1829 |
* @param fn the function to use to compute the value of |
1830 |
* the returned CompletableFuture |
1831 |
* @return the new CompletableFuture |
1832 |
*/ |
1833 |
public <U,V> CompletableFuture<V> thenCombineAsync(CompletableFuture<? extends U> other, |
1834 |
BiFunction<? super T,? super U,? extends V> fn) { |
1835 |
return doThenBiApply(other, fn, ForkJoinPool.commonPool()); |
1836 |
} |
1837 |
|
1838 |
/** |
1839 |
* Creates and returns a CompletableFuture that is |
1840 |
* asynchronously completed using the given executor with the |
1841 |
* result of the given function of this and the other given |
1842 |
* CompletableFuture's results when both complete. If this or |
1843 |
* the other CompletableFuture complete exceptionally, then the |
1844 |
* returned CompletableFuture also does so, with a |
1845 |
* CompletionException holding the exception as its cause. |
1846 |
* |
1847 |
* @param other the other CompletableFuture |
1848 |
* @param fn the function to use to compute the value of |
1849 |
* the returned CompletableFuture |
1850 |
* @param executor the executor to use for asynchronous execution |
1851 |
* @return the new CompletableFuture |
1852 |
*/ |
1853 |
|
1854 |
public <U,V> CompletableFuture<V> thenCombineAsync(CompletableFuture<? extends U> other, |
1855 |
BiFunction<? super T,? super U,? extends V> fn, |
1856 |
Executor executor) { |
1857 |
if (executor == null) throw new NullPointerException(); |
1858 |
return doThenBiApply(other, fn, executor); |
1859 |
} |
1860 |
|
1861 |
private <U,V> CompletableFuture<V> doThenBiApply(CompletableFuture<? extends U> other, |
1862 |
BiFunction<? super T,? super U,? extends V> fn, |
1863 |
Executor e) { |
1864 |
if (other == null || fn == null) throw new NullPointerException(); |
1865 |
CompletableFuture<V> dst = new CompletableFuture<V>(); |
1866 |
BiApplyCompletion<T,U,V> d = null; |
1867 |
Object r, s = null; |
1868 |
if ((r = result) == null || (s = other.result) == null) { |
1869 |
d = new BiApplyCompletion<T,U,V>(this, other, fn, dst, e); |
1870 |
CompletionNode q = null, p = new CompletionNode(d); |
1871 |
while ((r == null && (r = result) == null) || |
1872 |
(s == null && (s = other.result) == null)) { |
1873 |
if (q != null) { |
1874 |
if (s != null || |
1875 |
UNSAFE.compareAndSwapObject |
1876 |
(other, COMPLETIONS, q.next = other.completions, q)) |
1877 |
break; |
1878 |
} |
1879 |
else if (r != null || |
1880 |
UNSAFE.compareAndSwapObject |
1881 |
(this, COMPLETIONS, p.next = completions, p)) { |
1882 |
if (s != null) |
1883 |
break; |
1884 |
q = new CompletionNode(d); |
1885 |
} |
1886 |
} |
1887 |
} |
1888 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
1889 |
T t; U u; Throwable ex; |
1890 |
if (r instanceof AltResult) { |
1891 |
ex = ((AltResult)r).ex; |
1892 |
t = null; |
1893 |
} |
1894 |
else { |
1895 |
ex = null; |
1896 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1897 |
t = tr; |
1898 |
} |
1899 |
if (ex != null) |
1900 |
u = null; |
1901 |
else if (s instanceof AltResult) { |
1902 |
ex = ((AltResult)s).ex; |
1903 |
u = null; |
1904 |
} |
1905 |
else { |
1906 |
@SuppressWarnings("unchecked") U us = (U) s; |
1907 |
u = us; |
1908 |
} |
1909 |
V v = null; |
1910 |
if (ex == null) { |
1911 |
try { |
1912 |
if (e != null) |
1913 |
e.execute(new AsyncBiApply<T,U,V>(t, u, fn, dst)); |
1914 |
else |
1915 |
v = fn.apply(t, u); |
1916 |
} catch (Throwable rex) { |
1917 |
ex = rex; |
1918 |
} |
1919 |
} |
1920 |
if (e == null || ex != null) |
1921 |
dst.internalComplete(v, ex); |
1922 |
} |
1923 |
helpPostComplete(); |
1924 |
other.helpPostComplete(); |
1925 |
return dst; |
1926 |
} |
1927 |
|
1928 |
/** |
1929 |
* Creates and returns a CompletableFuture that is completed with |
1930 |
* the results of this and the other given CompletableFuture if |
1931 |
* both complete. If this and/or the other CompletableFuture |
1932 |
* complete exceptionally, then the returned CompletableFuture |
1933 |
* also does so, with a CompletionException holding one of these |
1934 |
* exceptions as its cause. |
1935 |
* |
1936 |
* @param other the other CompletableFuture |
1937 |
* @param block the action to perform before completing the |
1938 |
* returned CompletableFuture |
1939 |
* @return the new CompletableFuture |
1940 |
*/ |
1941 |
public <U> CompletableFuture<Void> thenAcceptBoth(CompletableFuture<? extends U> other, |
1942 |
BiConsumer<? super T, ? super U> block) { |
1943 |
return doThenBiAccept(other, block, null); |
1944 |
} |
1945 |
|
1946 |
/** |
1947 |
* Creates and returns a CompletableFuture that is completed |
1948 |
* asynchronously using the {@link ForkJoinPool#commonPool()} with |
1949 |
* the results of this and the other given CompletableFuture when |
1950 |
* both complete. If this and/or the other CompletableFuture |
1951 |
* complete exceptionally, then the returned CompletableFuture |
1952 |
* also does so, with a CompletionException holding one of these |
1953 |
* exceptions as its cause. |
1954 |
* |
1955 |
* @param other the other CompletableFuture |
1956 |
* @param block the action to perform before completing the |
1957 |
* returned CompletableFuture |
1958 |
* @return the new CompletableFuture |
1959 |
*/ |
1960 |
public <U> CompletableFuture<Void> thenAcceptBothAsync(CompletableFuture<? extends U> other, |
1961 |
BiConsumer<? super T, ? super U> block) { |
1962 |
return doThenBiAccept(other, block, ForkJoinPool.commonPool()); |
1963 |
} |
1964 |
|
1965 |
/** |
1966 |
* Creates and returns a CompletableFuture that is completed |
1967 |
* asynchronously using the given executor with the results of |
1968 |
* this and the other given CompletableFuture when both complete. |
1969 |
* If this and/or the other CompletableFuture complete |
1970 |
* exceptionally, then the returned CompletableFuture also does |
1971 |
* so, with a CompletionException holding one of these exceptions as |
1972 |
* its cause. |
1973 |
* |
1974 |
* @param other the other CompletableFuture |
1975 |
* @param block the action to perform before completing the |
1976 |
* returned CompletableFuture |
1977 |
* @param executor the executor to use for asynchronous execution |
1978 |
* @return the new CompletableFuture |
1979 |
*/ |
1980 |
public <U> CompletableFuture<Void> thenAcceptBothAsync(CompletableFuture<? extends U> other, |
1981 |
BiConsumer<? super T, ? super U> block, |
1982 |
Executor executor) { |
1983 |
if (executor == null) throw new NullPointerException(); |
1984 |
return doThenBiAccept(other, block, executor); |
1985 |
} |
1986 |
|
1987 |
private <U> CompletableFuture<Void> doThenBiAccept(CompletableFuture<? extends U> other, |
1988 |
BiConsumer<? super T,? super U> fn, |
1989 |
Executor e) { |
1990 |
if (other == null || fn == null) throw new NullPointerException(); |
1991 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1992 |
BiAcceptCompletion<T,U> d = null; |
1993 |
Object r, s = null; |
1994 |
if ((r = result) == null || (s = other.result) == null) { |
1995 |
d = new BiAcceptCompletion<T,U>(this, other, fn, dst, e); |
1996 |
CompletionNode q = null, p = new CompletionNode(d); |
1997 |
while ((r == null && (r = result) == null) || |
1998 |
(s == null && (s = other.result) == null)) { |
1999 |
if (q != null) { |
2000 |
if (s != null || |
2001 |
UNSAFE.compareAndSwapObject |
2002 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2003 |
break; |
2004 |
} |
2005 |
else if (r != null || |
2006 |
UNSAFE.compareAndSwapObject |
2007 |
(this, COMPLETIONS, p.next = completions, p)) { |
2008 |
if (s != null) |
2009 |
break; |
2010 |
q = new CompletionNode(d); |
2011 |
} |
2012 |
} |
2013 |
} |
2014 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
2015 |
T t; U u; Throwable ex; |
2016 |
if (r instanceof AltResult) { |
2017 |
ex = ((AltResult)r).ex; |
2018 |
t = null; |
2019 |
} |
2020 |
else { |
2021 |
ex = null; |
2022 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2023 |
t = tr; |
2024 |
} |
2025 |
if (ex != null) |
2026 |
u = null; |
2027 |
else if (s instanceof AltResult) { |
2028 |
ex = ((AltResult)s).ex; |
2029 |
u = null; |
2030 |
} |
2031 |
else { |
2032 |
@SuppressWarnings("unchecked") U us = (U) s; |
2033 |
u = us; |
2034 |
} |
2035 |
if (ex == null) { |
2036 |
try { |
2037 |
if (e != null) |
2038 |
e.execute(new AsyncBiAccept<T,U>(t, u, fn, dst)); |
2039 |
else |
2040 |
fn.accept(t, u); |
2041 |
} catch (Throwable rex) { |
2042 |
ex = rex; |
2043 |
} |
2044 |
} |
2045 |
if (e == null || ex != null) |
2046 |
dst.internalComplete(null, ex); |
2047 |
} |
2048 |
helpPostComplete(); |
2049 |
other.helpPostComplete(); |
2050 |
return dst; |
2051 |
} |
2052 |
|
2053 |
/** |
2054 |
* Creates and returns a CompletableFuture that is completed |
2055 |
* when this and the other given CompletableFuture both |
2056 |
* complete. If this and/or the other CompletableFuture complete |
2057 |
* exceptionally, then the returned CompletableFuture also does |
2058 |
* so, with a CompletionException holding one of these exceptions as |
2059 |
* its cause. |
2060 |
* |
2061 |
* @param other the other CompletableFuture |
2062 |
* @param action the action to perform before completing the |
2063 |
* returned CompletableFuture |
2064 |
* @return the new CompletableFuture |
2065 |
*/ |
2066 |
public CompletableFuture<Void> runAfterBoth(CompletableFuture<?> other, |
2067 |
Runnable action) { |
2068 |
return doThenBiRun(other, action, null); |
2069 |
} |
2070 |
|
2071 |
/** |
2072 |
* Creates and returns a CompletableFuture that is completed |
2073 |
* asynchronously using the {@link ForkJoinPool#commonPool()} |
2074 |
* when this and the other given CompletableFuture both |
2075 |
* complete. If this and/or the other CompletableFuture complete |
2076 |
* exceptionally, then the returned CompletableFuture also does |
2077 |
* so, with a CompletionException holding one of these exceptions as |
2078 |
* its cause. |
2079 |
* |
2080 |
* @param other the other CompletableFuture |
2081 |
* @param action the action to perform before completing the |
2082 |
* returned CompletableFuture |
2083 |
* @return the new CompletableFuture |
2084 |
*/ |
2085 |
public CompletableFuture<Void> runAfterBothAsync(CompletableFuture<?> other, |
2086 |
Runnable action) { |
2087 |
return doThenBiRun(other, action, ForkJoinPool.commonPool()); |
2088 |
} |
2089 |
|
2090 |
/** |
2091 |
* Creates and returns a CompletableFuture that is completed |
2092 |
* asynchronously using the given executor |
2093 |
* when this and the other given CompletableFuture both |
2094 |
* complete. If this and/or the other CompletableFuture complete |
2095 |
* exceptionally, then the returned CompletableFuture also does |
2096 |
* so, with a CompletionException holding one of these exceptions as |
2097 |
* its cause. |
2098 |
* |
2099 |
* @param other the other CompletableFuture |
2100 |
* @param action the action to perform before completing the |
2101 |
* returned CompletableFuture |
2102 |
* @param executor the executor to use for asynchronous execution |
2103 |
* @return the new CompletableFuture |
2104 |
*/ |
2105 |
public CompletableFuture<Void> runAfterBothAsync(CompletableFuture<?> other, |
2106 |
Runnable action, |
2107 |
Executor executor) { |
2108 |
if (executor == null) throw new NullPointerException(); |
2109 |
return doThenBiRun(other, action, executor); |
2110 |
} |
2111 |
|
2112 |
private CompletableFuture<Void> doThenBiRun(CompletableFuture<?> other, |
2113 |
Runnable action, |
2114 |
Executor e) { |
2115 |
if (other == null || action == null) throw new NullPointerException(); |
2116 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2117 |
BiRunCompletion<T> d = null; |
2118 |
Object r, s = null; |
2119 |
if ((r = result) == null || (s = other.result) == null) { |
2120 |
d = new BiRunCompletion<T>(this, other, action, dst, e); |
2121 |
CompletionNode q = null, p = new CompletionNode(d); |
2122 |
while ((r == null && (r = result) == null) || |
2123 |
(s == null && (s = other.result) == null)) { |
2124 |
if (q != null) { |
2125 |
if (s != null || |
2126 |
UNSAFE.compareAndSwapObject |
2127 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2128 |
break; |
2129 |
} |
2130 |
else if (r != null || |
2131 |
UNSAFE.compareAndSwapObject |
2132 |
(this, COMPLETIONS, p.next = completions, p)) { |
2133 |
if (s != null) |
2134 |
break; |
2135 |
q = new CompletionNode(d); |
2136 |
} |
2137 |
} |
2138 |
} |
2139 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
2140 |
Throwable ex; |
2141 |
if (r instanceof AltResult) |
2142 |
ex = ((AltResult)r).ex; |
2143 |
else |
2144 |
ex = null; |
2145 |
if (ex == null && (s instanceof AltResult)) |
2146 |
ex = ((AltResult)s).ex; |
2147 |
if (ex == null) { |
2148 |
try { |
2149 |
if (e != null) |
2150 |
e.execute(new AsyncRun(action, dst)); |
2151 |
else |
2152 |
action.run(); |
2153 |
} catch (Throwable rex) { |
2154 |
ex = rex; |
2155 |
} |
2156 |
} |
2157 |
if (e == null || ex != null) |
2158 |
dst.internalComplete(null, ex); |
2159 |
} |
2160 |
helpPostComplete(); |
2161 |
other.helpPostComplete(); |
2162 |
return dst; |
2163 |
} |
2164 |
|
2165 |
/** |
2166 |
* Creates and returns a CompletableFuture that is completed with |
2167 |
* the result of the given function of either this or the other |
2168 |
* given CompletableFuture's results when either complete. If |
2169 |
* this and/or the other CompletableFuture complete exceptionally, |
2170 |
* then the returned CompletableFuture may also do so, with a |
2171 |
* CompletionException holding one of these exceptions as its cause. |
2172 |
* No guarantees are made about which result or exception is used |
2173 |
* in the returned CompletableFuture. |
2174 |
* |
2175 |
* @param other the other CompletableFuture |
2176 |
* @param fn the function to use to compute the value of |
2177 |
* the returned CompletableFuture |
2178 |
* @return the new CompletableFuture |
2179 |
*/ |
2180 |
public <U> CompletableFuture<U> applyToEither(CompletableFuture<? extends T> other, |
2181 |
Function<? super T, U> fn) { |
2182 |
return doOrApply(other, fn, null); |
2183 |
} |
2184 |
|
2185 |
/** |
2186 |
* Creates and returns a CompletableFuture that is completed |
2187 |
* asynchronously using the {@link ForkJoinPool#commonPool()} with |
2188 |
* the result of the given function of either this or the other |
2189 |
* given CompletableFuture's results when either complete. If |
2190 |
* this and/or the other CompletableFuture complete exceptionally, |
2191 |
* then the returned CompletableFuture may also do so, with a |
2192 |
* CompletionException holding one of these exceptions as its cause. |
2193 |
* No guarantees are made about which result or exception is used |
2194 |
* in the returned CompletableFuture. |
2195 |
* |
2196 |
* @param other the other CompletableFuture |
2197 |
* @param fn the function to use to compute the value of |
2198 |
* the returned CompletableFuture |
2199 |
* @return the new CompletableFuture |
2200 |
*/ |
2201 |
public <U> CompletableFuture<U> applyToEitherAsync(CompletableFuture<? extends T> other, |
2202 |
Function<? super T, U> fn) { |
2203 |
return doOrApply(other, fn, ForkJoinPool.commonPool()); |
2204 |
} |
2205 |
|
2206 |
/** |
2207 |
* Creates and returns a CompletableFuture that is completed |
2208 |
* asynchronously using the given executor with the result of the |
2209 |
* given function of either this or the other given |
2210 |
* CompletableFuture's results when either complete. If this |
2211 |
* and/or the other CompletableFuture complete exceptionally, then |
2212 |
* the returned CompletableFuture may also do so, with a |
2213 |
* CompletionException holding one of these exceptions as its cause. |
2214 |
* No guarantees are made about which result or exception is used |
2215 |
* in the returned CompletableFuture. |
2216 |
* |
2217 |
* @param other the other CompletableFuture |
2218 |
* @param fn the function to use to compute the value of |
2219 |
* the returned CompletableFuture |
2220 |
* @param executor the executor to use for asynchronous execution |
2221 |
* @return the new CompletableFuture |
2222 |
*/ |
2223 |
public <U> CompletableFuture<U> applyToEitherAsync(CompletableFuture<? extends T> other, |
2224 |
Function<? super T, U> fn, |
2225 |
Executor executor) { |
2226 |
if (executor == null) throw new NullPointerException(); |
2227 |
return doOrApply(other, fn, executor); |
2228 |
} |
2229 |
|
2230 |
private <U> CompletableFuture<U> doOrApply(CompletableFuture<? extends T> other, |
2231 |
Function<? super T, U> fn, |
2232 |
Executor e) { |
2233 |
if (other == null || fn == null) throw new NullPointerException(); |
2234 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
2235 |
OrApplyCompletion<T,U> d = null; |
2236 |
Object r; |
2237 |
if ((r = result) == null && (r = other.result) == null) { |
2238 |
d = new OrApplyCompletion<T,U>(this, other, fn, dst, e); |
2239 |
CompletionNode q = null, p = new CompletionNode(d); |
2240 |
while ((r = result) == null && (r = other.result) == null) { |
2241 |
if (q != null) { |
2242 |
if (UNSAFE.compareAndSwapObject |
2243 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2244 |
break; |
2245 |
} |
2246 |
else if (UNSAFE.compareAndSwapObject |
2247 |
(this, COMPLETIONS, p.next = completions, p)) |
2248 |
q = new CompletionNode(d); |
2249 |
} |
2250 |
} |
2251 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2252 |
T t; Throwable ex; |
2253 |
if (r instanceof AltResult) { |
2254 |
ex = ((AltResult)r).ex; |
2255 |
t = null; |
2256 |
} |
2257 |
else { |
2258 |
ex = null; |
2259 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2260 |
t = tr; |
2261 |
} |
2262 |
U u = null; |
2263 |
if (ex == null) { |
2264 |
try { |
2265 |
if (e != null) |
2266 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
2267 |
else |
2268 |
u = fn.apply(t); |
2269 |
} catch (Throwable rex) { |
2270 |
ex = rex; |
2271 |
} |
2272 |
} |
2273 |
if (e == null || ex != null) |
2274 |
dst.internalComplete(u, ex); |
2275 |
} |
2276 |
helpPostComplete(); |
2277 |
other.helpPostComplete(); |
2278 |
return dst; |
2279 |
} |
2280 |
|
2281 |
/** |
2282 |
* Creates and returns a CompletableFuture that is completed after |
2283 |
* performing the given action with the result of either this or the |
2284 |
* other given CompletableFuture's result, when either complete. |
2285 |
* If this and/or the other CompletableFuture complete |
2286 |
* exceptionally, then the returned CompletableFuture may also do |
2287 |
* so, with a CompletionException holding one of these exceptions as |
2288 |
* its cause. No guarantees are made about which exception is |
2289 |
* used in the returned CompletableFuture. |
2290 |
* |
2291 |
* @param other the other CompletableFuture |
2292 |
* @param block the action to perform before completing the |
2293 |
* returned CompletableFuture |
2294 |
* @return the new CompletableFuture |
2295 |
*/ |
2296 |
public CompletableFuture<Void> acceptEither(CompletableFuture<? extends T> other, |
2297 |
Consumer<? super T> block) { |
2298 |
return doOrAccept(other, block, null); |
2299 |
} |
2300 |
|
2301 |
/** |
2302 |
* Creates and returns a CompletableFuture that is completed |
2303 |
* asynchronously using the {@link ForkJoinPool#commonPool()}, |
2304 |
* performing the given action with the result of either this or |
2305 |
* the other given CompletableFuture's result, when either |
2306 |
* complete. If this and/or the other CompletableFuture complete |
2307 |
* exceptionally, then the returned CompletableFuture may also do |
2308 |
* so, with a CompletionException holding one of these exceptions as |
2309 |
* its cause. No guarantees are made about which exception is |
2310 |
* used in the returned CompletableFuture. |
2311 |
* |
2312 |
* @param other the other CompletableFuture |
2313 |
* @param block the action to perform before completing the |
2314 |
* returned CompletableFuture |
2315 |
* @return the new CompletableFuture |
2316 |
*/ |
2317 |
public CompletableFuture<Void> acceptEitherAsync(CompletableFuture<? extends T> other, |
2318 |
Consumer<? super T> block) { |
2319 |
return doOrAccept(other, block, ForkJoinPool.commonPool()); |
2320 |
} |
2321 |
|
2322 |
/** |
2323 |
* Creates and returns a CompletableFuture that is completed |
2324 |
* asynchronously using the given executor, |
2325 |
* performing the given action with the result of either this or |
2326 |
* the other given CompletableFuture's result, when either |
2327 |
* complete. If this and/or the other CompletableFuture complete |
2328 |
* exceptionally, then the returned CompletableFuture may also do |
2329 |
* so, with a CompletionException holding one of these exceptions as |
2330 |
* its cause. No guarantees are made about which exception is |
2331 |
* used in the returned CompletableFuture. |
2332 |
* |
2333 |
* @param other the other CompletableFuture |
2334 |
* @param block the action to perform before completing the |
2335 |
* returned CompletableFuture |
2336 |
* @param executor the executor to use for asynchronous execution |
2337 |
* @return the new CompletableFuture |
2338 |
*/ |
2339 |
public CompletableFuture<Void> acceptEitherAsync(CompletableFuture<? extends T> other, |
2340 |
Consumer<? super T> block, |
2341 |
Executor executor) { |
2342 |
if (executor == null) throw new NullPointerException(); |
2343 |
return doOrAccept(other, block, executor); |
2344 |
} |
2345 |
|
2346 |
private CompletableFuture<Void> doOrAccept(CompletableFuture<? extends T> other, |
2347 |
Consumer<? super T> fn, |
2348 |
Executor e) { |
2349 |
if (other == null || fn == null) throw new NullPointerException(); |
2350 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2351 |
OrAcceptCompletion<T> d = null; |
2352 |
Object r; |
2353 |
if ((r = result) == null && (r = other.result) == null) { |
2354 |
d = new OrAcceptCompletion<T>(this, other, fn, dst, e); |
2355 |
CompletionNode q = null, p = new CompletionNode(d); |
2356 |
while ((r = result) == null && (r = other.result) == null) { |
2357 |
if (q != null) { |
2358 |
if (UNSAFE.compareAndSwapObject |
2359 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2360 |
break; |
2361 |
} |
2362 |
else if (UNSAFE.compareAndSwapObject |
2363 |
(this, COMPLETIONS, p.next = completions, p)) |
2364 |
q = new CompletionNode(d); |
2365 |
} |
2366 |
} |
2367 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2368 |
T t; Throwable ex; |
2369 |
if (r instanceof AltResult) { |
2370 |
ex = ((AltResult)r).ex; |
2371 |
t = null; |
2372 |
} |
2373 |
else { |
2374 |
ex = null; |
2375 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2376 |
t = tr; |
2377 |
} |
2378 |
if (ex == null) { |
2379 |
try { |
2380 |
if (e != null) |
2381 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
2382 |
else |
2383 |
fn.accept(t); |
2384 |
} catch (Throwable rex) { |
2385 |
ex = rex; |
2386 |
} |
2387 |
} |
2388 |
if (e == null || ex != null) |
2389 |
dst.internalComplete(null, ex); |
2390 |
} |
2391 |
helpPostComplete(); |
2392 |
other.helpPostComplete(); |
2393 |
return dst; |
2394 |
} |
2395 |
|
2396 |
/** |
2397 |
* Creates and returns a CompletableFuture that is completed |
2398 |
* after this or the other given CompletableFuture complete. If |
2399 |
* this and/or the other CompletableFuture complete exceptionally, |
2400 |
* then the returned CompletableFuture may also do so, with a |
2401 |
* CompletionException holding one of these exceptions as its cause. |
2402 |
* No guarantees are made about which exception is used in the |
2403 |
* returned CompletableFuture. |
2404 |
* |
2405 |
* @param other the other CompletableFuture |
2406 |
* @param action the action to perform before completing the |
2407 |
* returned CompletableFuture |
2408 |
* @return the new CompletableFuture |
2409 |
*/ |
2410 |
public CompletableFuture<Void> runAfterEither(CompletableFuture<?> other, |
2411 |
Runnable action) { |
2412 |
return doOrRun(other, action, null); |
2413 |
} |
2414 |
|
2415 |
/** |
2416 |
* Creates and returns a CompletableFuture that is completed |
2417 |
* asynchronously using the {@link ForkJoinPool#commonPool()} |
2418 |
* after this or the other given CompletableFuture complete. If |
2419 |
* this and/or the other CompletableFuture complete exceptionally, |
2420 |
* then the returned CompletableFuture may also do so, with a |
2421 |
* CompletionException holding one of these exceptions as its cause. |
2422 |
* No guarantees are made about which exception is used in the |
2423 |
* returned CompletableFuture. |
2424 |
* |
2425 |
* @param other the other CompletableFuture |
2426 |
* @param action the action to perform before completing the |
2427 |
* returned CompletableFuture |
2428 |
* @return the new CompletableFuture |
2429 |
*/ |
2430 |
public CompletableFuture<Void> runAfterEitherAsync(CompletableFuture<?> other, |
2431 |
Runnable action) { |
2432 |
return doOrRun(other, action, ForkJoinPool.commonPool()); |
2433 |
} |
2434 |
|
2435 |
/** |
2436 |
* Creates and returns a CompletableFuture that is completed |
2437 |
* asynchronously using the given executor after this or the other |
2438 |
* given CompletableFuture complete. If this and/or the other |
2439 |
* CompletableFuture complete exceptionally, then the returned |
2440 |
* CompletableFuture may also do so, with a CompletionException |
2441 |
* holding one of these exceptions as its cause. No guarantees are |
2442 |
* made about which exception is used in the returned |
2443 |
* CompletableFuture. |
2444 |
* |
2445 |
* @param other the other CompletableFuture |
2446 |
* @param action the action to perform before completing the |
2447 |
* returned CompletableFuture |
2448 |
* @param executor the executor to use for asynchronous execution |
2449 |
* @return the new CompletableFuture |
2450 |
*/ |
2451 |
public CompletableFuture<Void> runAfterEitherAsync(CompletableFuture<?> other, |
2452 |
Runnable action, |
2453 |
Executor executor) { |
2454 |
if (executor == null) throw new NullPointerException(); |
2455 |
return doOrRun(other, action, executor); |
2456 |
} |
2457 |
|
2458 |
private CompletableFuture<Void> doOrRun(CompletableFuture<?> other, |
2459 |
Runnable action, |
2460 |
Executor e) { |
2461 |
if (other == null || action == null) throw new NullPointerException(); |
2462 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2463 |
OrRunCompletion<T> d = null; |
2464 |
Object r; |
2465 |
if ((r = result) == null && (r = other.result) == null) { |
2466 |
d = new OrRunCompletion<T>(this, other, action, dst, e); |
2467 |
CompletionNode q = null, p = new CompletionNode(d); |
2468 |
while ((r = result) == null && (r = other.result) == null) { |
2469 |
if (q != null) { |
2470 |
if (UNSAFE.compareAndSwapObject |
2471 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2472 |
break; |
2473 |
} |
2474 |
else if (UNSAFE.compareAndSwapObject |
2475 |
(this, COMPLETIONS, p.next = completions, p)) |
2476 |
q = new CompletionNode(d); |
2477 |
} |
2478 |
} |
2479 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2480 |
Throwable ex; |
2481 |
if (r instanceof AltResult) |
2482 |
ex = ((AltResult)r).ex; |
2483 |
else |
2484 |
ex = null; |
2485 |
if (ex == null) { |
2486 |
try { |
2487 |
if (e != null) |
2488 |
e.execute(new AsyncRun(action, dst)); |
2489 |
else |
2490 |
action.run(); |
2491 |
} catch (Throwable rex) { |
2492 |
ex = rex; |
2493 |
} |
2494 |
} |
2495 |
if (e == null || ex != null) |
2496 |
dst.internalComplete(null, ex); |
2497 |
} |
2498 |
helpPostComplete(); |
2499 |
other.helpPostComplete(); |
2500 |
return dst; |
2501 |
} |
2502 |
|
2503 |
/** |
2504 |
* Returns a CompletableFuture (or an equivalent one) produced by |
2505 |
* the given function of the result of this CompletableFuture when |
2506 |
* completed. If this CompletableFuture completes exceptionally, |
2507 |
* then the returned CompletableFuture also does so, with a |
2508 |
* CompletionException holding this exception as its cause. |
2509 |
* |
2510 |
* @param fn the function returning a new CompletableFuture. |
2511 |
* @return the CompletableFuture, that {@code isDone()} upon |
2512 |
* return if completed by the given function, or an exception |
2513 |
* occurs. |
2514 |
*/ |
2515 |
public <U> CompletableFuture<U> thenCompose(Function<? super T, |
2516 |
CompletableFuture<U>> fn) { |
2517 |
if (fn == null) throw new NullPointerException(); |
2518 |
CompletableFuture<U> dst = null; |
2519 |
ComposeCompletion<T,U> d = null; |
2520 |
Object r; |
2521 |
if ((r = result) == null) { |
2522 |
dst = new CompletableFuture<U>(); |
2523 |
CompletionNode p = new CompletionNode |
2524 |
(d = new ComposeCompletion<T,U>(this, fn, dst)); |
2525 |
while ((r = result) == null) { |
2526 |
if (UNSAFE.compareAndSwapObject |
2527 |
(this, COMPLETIONS, p.next = completions, p)) |
2528 |
break; |
2529 |
} |
2530 |
} |
2531 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2532 |
T t; Throwable ex; |
2533 |
if (r instanceof AltResult) { |
2534 |
ex = ((AltResult)r).ex; |
2535 |
t = null; |
2536 |
} |
2537 |
else { |
2538 |
ex = null; |
2539 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2540 |
t = tr; |
2541 |
} |
2542 |
if (ex == null) { |
2543 |
try { |
2544 |
dst = fn.apply(t); |
2545 |
} catch (Throwable rex) { |
2546 |
ex = rex; |
2547 |
} |
2548 |
} |
2549 |
if (dst == null) { |
2550 |
dst = new CompletableFuture<U>(); |
2551 |
if (ex == null) |
2552 |
ex = new NullPointerException(); |
2553 |
} |
2554 |
if (ex != null) |
2555 |
dst.internalComplete(null, ex); |
2556 |
} |
2557 |
helpPostComplete(); |
2558 |
dst.helpPostComplete(); |
2559 |
return dst; |
2560 |
} |
2561 |
|
2562 |
/** |
2563 |
* Creates and returns a CompletableFuture that is completed with |
2564 |
* the result of the given function of the exception triggering |
2565 |
* this CompletableFuture's completion when it completes |
2566 |
* exceptionally; Otherwise, if this CompletableFuture completes |
2567 |
* normally, then the returned CompletableFuture also completes |
2568 |
* normally with the same value. |
2569 |
* |
2570 |
* @param fn the function to use to compute the value of the |
2571 |
* returned CompletableFuture if this CompletableFuture completed |
2572 |
* exceptionally |
2573 |
* @return the new CompletableFuture |
2574 |
*/ |
2575 |
public CompletableFuture<T> exceptionally(Function<Throwable, ? extends T> fn) { |
2576 |
if (fn == null) throw new NullPointerException(); |
2577 |
CompletableFuture<T> dst = new CompletableFuture<T>(); |
2578 |
ExceptionCompletion<T> d = null; |
2579 |
Object r; |
2580 |
if ((r = result) == null) { |
2581 |
CompletionNode p = |
2582 |
new CompletionNode(d = new ExceptionCompletion<T>(this, fn, dst)); |
2583 |
while ((r = result) == null) { |
2584 |
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, |
2585 |
p.next = completions, p)) |
2586 |
break; |
2587 |
} |
2588 |
} |
2589 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2590 |
T t = null; Throwable ex, dx = null; |
2591 |
if (r instanceof AltResult) { |
2592 |
if ((ex = ((AltResult)r).ex) != null) { |
2593 |
try { |
2594 |
t = fn.apply(ex); |
2595 |
} catch (Throwable rex) { |
2596 |
dx = rex; |
2597 |
} |
2598 |
} |
2599 |
} |
2600 |
else { |
2601 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2602 |
t = tr; |
2603 |
} |
2604 |
dst.internalComplete(t, dx); |
2605 |
} |
2606 |
helpPostComplete(); |
2607 |
return dst; |
2608 |
} |
2609 |
|
2610 |
/** |
2611 |
* Creates and returns a CompletableFuture that is completed with |
2612 |
* the result of the given function of the result and exception of |
2613 |
* this CompletableFuture's completion when it completes. The |
2614 |
* given function is invoked with the result (or {@code null} if |
2615 |
* none) and the exception (or {@code null} if none) of this |
2616 |
* CompletableFuture when complete. |
2617 |
* |
2618 |
* @param fn the function to use to compute the value of the |
2619 |
* returned CompletableFuture |
2620 |
|
2621 |
* @return the new CompletableFuture |
2622 |
*/ |
2623 |
public <U> CompletableFuture<U> handle(BiFunction<? super T, Throwable, ? extends U> fn) { |
2624 |
if (fn == null) throw new NullPointerException(); |
2625 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
2626 |
HandleCompletion<T,U> d = null; |
2627 |
Object r; |
2628 |
if ((r = result) == null) { |
2629 |
CompletionNode p = |
2630 |
new CompletionNode(d = new HandleCompletion<T,U>(this, fn, dst)); |
2631 |
while ((r = result) == null) { |
2632 |
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, |
2633 |
p.next = completions, p)) |
2634 |
break; |
2635 |
} |
2636 |
} |
2637 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2638 |
T t; Throwable ex; |
2639 |
if (r instanceof AltResult) { |
2640 |
ex = ((AltResult)r).ex; |
2641 |
t = null; |
2642 |
} |
2643 |
else { |
2644 |
ex = null; |
2645 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2646 |
t = tr; |
2647 |
} |
2648 |
U u; Throwable dx; |
2649 |
try { |
2650 |
u = fn.apply(t, ex); |
2651 |
dx = null; |
2652 |
} catch (Throwable rex) { |
2653 |
dx = rex; |
2654 |
u = null; |
2655 |
} |
2656 |
dst.internalComplete(u, dx); |
2657 |
} |
2658 |
helpPostComplete(); |
2659 |
return dst; |
2660 |
} |
2661 |
|
2662 |
|
2663 |
/* ------------- Arbitrary-arity constructions -------------- */ |
2664 |
|
2665 |
/* |
2666 |
* The basic plan of attack is to recursively form binary |
2667 |
* completion trees of elements. This can be overkill for small |
2668 |
* sets, but scales nicely. The And/All vs Or/Any forms use the |
2669 |
* same idea, but details differ. |
2670 |
*/ |
2671 |
|
2672 |
/** |
2673 |
* Returns a new CompletableFuture that is completed when all of |
2674 |
* the given CompletableFutures complete. If any of the component |
2675 |
* CompletableFuture complete exceptionally, then so does the |
2676 |
* returned CompletableFuture. Otherwise, the results, if any, of |
2677 |
* the component CompletableFutures are not reflected in the |
2678 |
* returned CompletableFuture, but may be obtained by inspecting |
2679 |
* them individually. If the number of components is zero, returns |
2680 |
* a completed CompletableFuture. |
2681 |
* |
2682 |
* <p>Among the applications of this method is to await completion |
2683 |
* of a set of independent CompletableFutures before continuing a |
2684 |
* program, as in: {@code CompletableFuture.allOf(c1, c2, |
2685 |
* c3).join();}. |
2686 |
* |
2687 |
* @param cfs the CompletableFutures |
2688 |
* @return a CompletableFuture that is complete when all of the |
2689 |
* given CompletableFutures complete |
2690 |
* @throws NullPointerException if the array or any of its elements are |
2691 |
* {@code null} |
2692 |
*/ |
2693 |
public static CompletableFuture<Void> allOf(CompletableFuture<?>... cfs) { |
2694 |
int len = cfs.length; // Directly handle empty and singleton cases |
2695 |
if (len > 1) |
2696 |
return allTree(cfs, 0, len - 1); |
2697 |
else { |
2698 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2699 |
CompletableFuture<?> f; |
2700 |
if (len == 0) |
2701 |
dst.result = NIL; |
2702 |
else if ((f = cfs[0]) == null) |
2703 |
throw new NullPointerException(); |
2704 |
else { |
2705 |
ThenCopy d = null; |
2706 |
CompletionNode p = null; |
2707 |
Object r; |
2708 |
while ((r = f.result) == null) { |
2709 |
if (d == null) |
2710 |
d = new ThenCopy(f, dst); |
2711 |
else if (p == null) |
2712 |
p = new CompletionNode(d); |
2713 |
else if (UNSAFE.compareAndSwapObject |
2714 |
(f, COMPLETIONS, p.next = f.completions, p)) |
2715 |
break; |
2716 |
} |
2717 |
if (r != null && (d == null || d.compareAndSet(0, 1))) |
2718 |
dst.internalComplete(null, (r instanceof AltResult) ? |
2719 |
((AltResult)r).ex : null); |
2720 |
f.helpPostComplete(); |
2721 |
} |
2722 |
return dst; |
2723 |
} |
2724 |
} |
2725 |
|
2726 |
/** |
2727 |
* Recursively constructs an And'ed tree of CompletableFutures. |
2728 |
* Called only when array known to have at least two elements. |
2729 |
*/ |
2730 |
private static CompletableFuture<Void> allTree(CompletableFuture<?>[] cfs, |
2731 |
int lo, int hi) { |
2732 |
CompletableFuture<?> fst, snd; |
2733 |
int mid = (lo + hi) >>> 1; |
2734 |
if ((fst = (lo == mid ? cfs[lo] : allTree(cfs, lo, mid))) == null || |
2735 |
(snd = (hi == mid+1 ? cfs[hi] : allTree(cfs, mid+1, hi))) == null) |
2736 |
throw new NullPointerException(); |
2737 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2738 |
AndCompletion d = null; |
2739 |
CompletionNode p = null, q = null; |
2740 |
Object r = null, s = null; |
2741 |
while ((r = fst.result) == null || (s = snd.result) == null) { |
2742 |
if (d == null) |
2743 |
d = new AndCompletion(fst, snd, dst); |
2744 |
else if (p == null) |
2745 |
p = new CompletionNode(d); |
2746 |
else if (q == null) { |
2747 |
if (UNSAFE.compareAndSwapObject |
2748 |
(fst, COMPLETIONS, p.next = fst.completions, p)) |
2749 |
q = new CompletionNode(d); |
2750 |
} |
2751 |
else if (UNSAFE.compareAndSwapObject |
2752 |
(snd, COMPLETIONS, q.next = snd.completions, q)) |
2753 |
break; |
2754 |
} |
2755 |
if ((r != null || (r = fst.result) != null) && |
2756 |
(s != null || (s = snd.result) != null) && |
2757 |
(d == null || d.compareAndSet(0, 1))) { |
2758 |
Throwable ex; |
2759 |
if (r instanceof AltResult) |
2760 |
ex = ((AltResult)r).ex; |
2761 |
else |
2762 |
ex = null; |
2763 |
if (ex == null && (s instanceof AltResult)) |
2764 |
ex = ((AltResult)s).ex; |
2765 |
dst.internalComplete(null, ex); |
2766 |
} |
2767 |
fst.helpPostComplete(); |
2768 |
snd.helpPostComplete(); |
2769 |
return dst; |
2770 |
} |
2771 |
|
2772 |
/** |
2773 |
* Returns a new CompletableFuture that is completed when any of |
2774 |
* the component CompletableFutures complete; with the same result if |
2775 |
* it completed normally, otherwise exceptionally. If the number |
2776 |
* of components is zero, returns a completed CompletableFuture. |
2777 |
* |
2778 |
* @param cfs the CompletableFutures |
2779 |
* @return a CompletableFuture that is complete when any of the |
2780 |
* given CompletableFutures complete |
2781 |
* @throws NullPointerException if the array or any of its elements are |
2782 |
* {@code null} |
2783 |
*/ |
2784 |
public static CompletableFuture<?> anyOf(CompletableFuture<?>... cfs) { |
2785 |
int len = cfs.length; // Same idea as allOf |
2786 |
if (len > 1) |
2787 |
return anyTree(cfs, 0, len - 1); |
2788 |
else { |
2789 |
CompletableFuture<?> dst = new CompletableFuture<Object>(); |
2790 |
CompletableFuture<?> f; |
2791 |
if (len == 0) |
2792 |
dst.result = NIL; |
2793 |
else if ((f = cfs[0]) == null) |
2794 |
throw new NullPointerException(); |
2795 |
else { |
2796 |
ThenCopy d = null; |
2797 |
CompletionNode p = null; |
2798 |
Object r; |
2799 |
while ((r = f.result) == null) { |
2800 |
if (d == null) |
2801 |
d = new ThenCopy(f, dst); |
2802 |
else if (p == null) |
2803 |
p = new CompletionNode(d); |
2804 |
else if (UNSAFE.compareAndSwapObject |
2805 |
(f, COMPLETIONS, p.next = f.completions, p)) |
2806 |
break; |
2807 |
} |
2808 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2809 |
Throwable ex; Object t; |
2810 |
if (r instanceof AltResult) { |
2811 |
ex = ((AltResult)r).ex; |
2812 |
t = null; |
2813 |
} |
2814 |
else { |
2815 |
ex = null; |
2816 |
t = r; |
2817 |
} |
2818 |
dst.internalComplete(t, ex); |
2819 |
} |
2820 |
f.helpPostComplete(); |
2821 |
} |
2822 |
return dst; |
2823 |
} |
2824 |
} |
2825 |
|
2826 |
/** |
2827 |
* Recursively constructs an Or'ed tree of CompletableFutures |
2828 |
*/ |
2829 |
private static CompletableFuture<?> anyTree(CompletableFuture<?>[] cfs, |
2830 |
int lo, int hi) { |
2831 |
CompletableFuture<?> fst, snd; |
2832 |
int mid = (lo + hi) >>> 1; |
2833 |
if ((fst = (lo == mid ? cfs[lo] : anyTree(cfs, lo, mid))) == null || |
2834 |
(snd = (hi == mid+1 ? cfs[hi] : anyTree(cfs, mid+1, hi))) == null) |
2835 |
throw new NullPointerException(); |
2836 |
CompletableFuture<?> dst = new CompletableFuture<Object>(); |
2837 |
OrCompletion d = null; |
2838 |
CompletionNode p = null, q = null; |
2839 |
Object r; |
2840 |
while ((r = fst.result) == null && (r = snd.result) == null) { |
2841 |
if (d == null) |
2842 |
d = new OrCompletion(fst, snd, dst); |
2843 |
else if (p == null) |
2844 |
p = new CompletionNode(d); |
2845 |
else if (q == null) { |
2846 |
if (UNSAFE.compareAndSwapObject |
2847 |
(fst, COMPLETIONS, p.next = fst.completions, p)) |
2848 |
q = new CompletionNode(d); |
2849 |
} |
2850 |
else if (UNSAFE.compareAndSwapObject |
2851 |
(snd, COMPLETIONS, q.next = snd.completions, q)) |
2852 |
break; |
2853 |
} |
2854 |
if ((r != null || (r = fst.result) != null || |
2855 |
(r = snd.result) != null) && |
2856 |
(d == null || d.compareAndSet(0, 1))) { |
2857 |
Throwable ex; Object t; |
2858 |
if (r instanceof AltResult) { |
2859 |
ex = ((AltResult)r).ex; |
2860 |
t = null; |
2861 |
} |
2862 |
else { |
2863 |
ex = null; |
2864 |
t = r; |
2865 |
} |
2866 |
dst.internalComplete(t, ex); |
2867 |
} |
2868 |
fst.helpPostComplete(); |
2869 |
snd.helpPostComplete(); |
2870 |
return dst; |
2871 |
} |
2872 |
|
2873 |
|
2874 |
/* ------------- Control and status methods -------------- */ |
2875 |
|
2876 |
/** |
2877 |
* Attempts to complete this CompletableFuture with |
2878 |
* a {@link CancellationException}. |
2879 |
* |
2880 |
* @param mayInterruptIfRunning this value has no effect in this |
2881 |
* implementation because interrupts are not used to control |
2882 |
* processing. |
2883 |
* |
2884 |
* @return {@code true} if this task is now cancelled |
2885 |
*/ |
2886 |
public boolean cancel(boolean mayInterruptIfRunning) { |
2887 |
Object r; |
2888 |
while ((r = result) == null) { |
2889 |
r = new AltResult(new CancellationException()); |
2890 |
if (UNSAFE.compareAndSwapObject(this, RESULT, null, r)) { |
2891 |
postComplete(); |
2892 |
return true; |
2893 |
} |
2894 |
} |
2895 |
return ((r instanceof AltResult) && |
2896 |
(((AltResult)r).ex instanceof CancellationException)); |
2897 |
} |
2898 |
|
2899 |
/** |
2900 |
* Returns {@code true} if this CompletableFuture was cancelled |
2901 |
* before it completed normally. |
2902 |
* |
2903 |
* @return {@code true} if this CompletableFuture was cancelled |
2904 |
* before it completed normally |
2905 |
*/ |
2906 |
public boolean isCancelled() { |
2907 |
Object r; |
2908 |
return ((r = result) != null && |
2909 |
(r instanceof AltResult) && |
2910 |
(((AltResult)r).ex instanceof CancellationException)); |
2911 |
} |
2912 |
|
2913 |
/** |
2914 |
* Forcibly sets or resets the value subsequently returned by |
2915 |
* method get() and related methods, whether or not already |
2916 |
* completed. This method is designed for use only in error |
2917 |
* recovery actions, and even in such situations may result in |
2918 |
* ongoing dependent completions using established versus |
2919 |
* overwritten outcomes. |
2920 |
* |
2921 |
* @param value the completion value |
2922 |
*/ |
2923 |
public void obtrudeValue(T value) { |
2924 |
result = (value == null) ? NIL : value; |
2925 |
postComplete(); |
2926 |
} |
2927 |
|
2928 |
/** |
2929 |
* Forcibly causes subsequent invocations of method get() and |
2930 |
* related methods to throw the given exception, whether or not |
2931 |
* already completed. This method is designed for use only in |
2932 |
* recovery actions, and even in such situations may result in |
2933 |
* ongoing dependent completions using established versus |
2934 |
* overwritten outcomes. |
2935 |
* |
2936 |
* @param ex the exception |
2937 |
*/ |
2938 |
public void obtrudeException(Throwable ex) { |
2939 |
if (ex == null) throw new NullPointerException(); |
2940 |
result = new AltResult(ex); |
2941 |
postComplete(); |
2942 |
} |
2943 |
|
2944 |
/** |
2945 |
* Returns the estimated number of CompletableFutures whose |
2946 |
* completions are awaiting completion of this CompletableFuture. |
2947 |
* This method is designed for use in monitoring system state, not |
2948 |
* for synchronization control. |
2949 |
* |
2950 |
* @return the number of dependent CompletableFutures |
2951 |
*/ |
2952 |
public int getNumberOfDependents() { |
2953 |
int count = 0; |
2954 |
for (CompletionNode p = completions; p != null; p = p.next) |
2955 |
++count; |
2956 |
return count; |
2957 |
} |
2958 |
|
2959 |
/** |
2960 |
* Returns a string identifying this CompletableFuture, as well as |
2961 |
* its completion state. The state, in brackets, includes the |
2962 |
* String {@code "Completed Normally"} or the String {@code |
2963 |
* "Completed Exceptionally"}, or the String {@code "Not |
2964 |
* completed"} followed by the number of CompletableFutures |
2965 |
* dependent upon its completion, if any. |
2966 |
* |
2967 |
* @return a string identifying this CompletableFuture, as well as its state |
2968 |
*/ |
2969 |
public String toString() { |
2970 |
String id = super.toString(); |
2971 |
int count = getNumberOfDependents(); |
2972 |
Object r = result; |
2973 |
Throwable ex = (r != null && (r instanceof AltResult) ? |
2974 |
((AltResult)r).ex : null); |
2975 |
return id + (ex != null ? "[Completed exceptionally]" : |
2976 |
(r != null ? "[Completed normally]" : |
2977 |
(count == 0 ? "[Not completed]" : |
2978 |
("[Not completed, " + count + " dependents]")))); |
2979 |
} |
2980 |
|
2981 |
// Unsafe mechanics |
2982 |
private static final sun.misc.Unsafe UNSAFE; |
2983 |
private static final long RESULT; |
2984 |
private static final long WAITERS; |
2985 |
private static final long COMPLETIONS; |
2986 |
static { |
2987 |
try { |
2988 |
UNSAFE = sun.misc.Unsafe.getUnsafe(); |
2989 |
Class<?> k = CompletableFuture.class; |
2990 |
RESULT = UNSAFE.objectFieldOffset |
2991 |
(k.getDeclaredField("result")); |
2992 |
WAITERS = UNSAFE.objectFieldOffset |
2993 |
(k.getDeclaredField("waiters")); |
2994 |
COMPLETIONS = UNSAFE.objectFieldOffset |
2995 |
(k.getDeclaredField("completions")); |
2996 |
} catch (Exception e) { |
2997 |
throw new Error(e); |
2998 |
} |
2999 |
} |
3000 |
} |