1 |
dl |
1.1 |
/* |
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 |
jsr166 |
1.136 |
|
9 |
|
|
import java.util.concurrent.locks.LockSupport; |
10 |
|
|
import java.util.function.BiConsumer; |
11 |
|
|
import java.util.function.BiFunction; |
12 |
dl |
1.34 |
import java.util.function.Consumer; |
13 |
dl |
1.1 |
import java.util.function.Function; |
14 |
jsr166 |
1.136 |
import java.util.function.Supplier; |
15 |
dl |
1.1 |
|
16 |
|
|
/** |
17 |
|
|
* A {@link Future} that may be explicitly completed (setting its |
18 |
dl |
1.88 |
* value and status), and may be used as a {@link CompletionStage}, |
19 |
|
|
* supporting dependent functions and actions that trigger upon its |
20 |
|
|
* completion. |
21 |
dl |
1.1 |
* |
22 |
jsr166 |
1.50 |
* <p>When two or more threads attempt to |
23 |
|
|
* {@link #complete complete}, |
24 |
jsr166 |
1.52 |
* {@link #completeExceptionally completeExceptionally}, or |
25 |
jsr166 |
1.50 |
* {@link #cancel cancel} |
26 |
|
|
* a CompletableFuture, only one of them succeeds. |
27 |
dl |
1.19 |
* |
28 |
dl |
1.91 |
* <p>In addition to these and related methods for directly |
29 |
|
|
* manipulating status and results, CompletableFuture implements |
30 |
|
|
* interface {@link CompletionStage} with the following policies: <ul> |
31 |
dl |
1.35 |
* |
32 |
dl |
1.88 |
* <li>Actions supplied for dependent completions of |
33 |
|
|
* <em>non-async</em> methods may be performed by the thread that |
34 |
|
|
* completes the current CompletableFuture, or by any other caller of |
35 |
dl |
1.96 |
* a completion method.</li> |
36 |
jsr166 |
1.65 |
* |
37 |
dl |
1.88 |
* <li>All <em>async</em> methods without an explicit Executor |
38 |
dl |
1.96 |
* argument are performed using the {@link ForkJoinPool#commonPool()} |
39 |
|
|
* (unless it does not support a parallelism level of at least two, in |
40 |
dl |
1.143 |
* which case, a new Thread is created to run each task). This may be |
41 |
|
|
* overridden for non-static methods in subclasses by defining method |
42 |
|
|
* {@link #defaultExecutor()}. To simplify monitoring, debugging, |
43 |
|
|
* and tracking, all generated asynchronous tasks are instances of the |
44 |
|
|
* marker interface {@link AsynchronousCompletionTask}. Operations |
45 |
|
|
* with time-delays can use adaptor methods defined in this class, for |
46 |
|
|
* example: {@code supplyAsync(supplier, delayedExecutor(timeout, |
47 |
|
|
* timeUnit))}. To support methods with delays and timeouts, this |
48 |
|
|
* class maintains at most one daemon thread for triggering and |
49 |
|
|
* cancelling actions, not for running them.</li> |
50 |
dl |
1.35 |
* |
51 |
dl |
1.88 |
* <li>All CompletionStage methods are implemented independently of |
52 |
|
|
* other public methods, so the behavior of one method is not impacted |
53 |
dl |
1.143 |
* by overrides of others in subclasses. </li> |
54 |
|
|
* |
55 |
|
|
* <li>All CompletionStage methods return CompletableFutures. To |
56 |
|
|
* restrict usages to only those methods defined in interface |
57 |
|
|
* CompletionStage, use the new CompletionStage from method {@link |
58 |
|
|
* minimalCompletionStage}. Or to ensure only that clients do not |
59 |
|
|
* themselves modify a future, use method {@link copy}. </li> </ul> |
60 |
dl |
1.88 |
* |
61 |
dl |
1.91 |
* <p>CompletableFuture also implements {@link Future} with the following |
62 |
dl |
1.88 |
* policies: <ul> |
63 |
|
|
* |
64 |
|
|
* <li>Since (unlike {@link FutureTask}) this class has no direct |
65 |
jsr166 |
1.55 |
* control over the computation that causes it to be completed, |
66 |
dl |
1.88 |
* cancellation is treated as just another form of exceptional |
67 |
|
|
* completion. Method {@link #cancel cancel} has the same effect as |
68 |
|
|
* {@code completeExceptionally(new CancellationException())}. Method |
69 |
|
|
* {@link #isCompletedExceptionally} can be used to determine if a |
70 |
|
|
* CompletableFuture completed in any exceptional fashion.</li> |
71 |
jsr166 |
1.55 |
* |
72 |
dl |
1.88 |
* <li>In case of exceptional completion with a CompletionException, |
73 |
jsr166 |
1.55 |
* methods {@link #get()} and {@link #get(long, TimeUnit)} throw an |
74 |
|
|
* {@link ExecutionException} with the same cause as held in the |
75 |
dl |
1.88 |
* corresponding CompletionException. To simplify usage in most |
76 |
|
|
* contexts, this class also defines methods {@link #join()} and |
77 |
|
|
* {@link #getNow} that instead throw the CompletionException directly |
78 |
|
|
* in these cases.</li> </ul> |
79 |
jsr166 |
1.80 |
* |
80 |
dl |
1.143 |
* <p>Subclasses of this class should normally override the "virtual |
81 |
|
|
* constructor" method {@link #newIncompleteFuture}, which establishes |
82 |
|
|
* the concrete type returned by CompletionStage methods. For example, |
83 |
|
|
* here is a class that substitutes a different default Executor and |
84 |
|
|
* disables the {@code obtrude} methods: |
85 |
|
|
* |
86 |
|
|
* <pre> {@code |
87 |
|
|
* class MyCompletableFuture<T> extends CompletableFuture<T> { |
88 |
|
|
* static final Executor myExecutor = ...; |
89 |
|
|
* public MyCompletableFuture() { } |
90 |
|
|
* public <U> CompletableFuture<U> newIncompleteFuture() { |
91 |
|
|
* return new MyCompletableFuture<U>(); } |
92 |
|
|
* public Executor defaultExecutor() { |
93 |
|
|
* return myExecutor; } |
94 |
|
|
* public void obtrudeValue(T value) { |
95 |
|
|
* throw new UnsupportedOperationException(); } |
96 |
|
|
* public void obtrudeException(Throwable ex) { |
97 |
|
|
* throw new UnsupportedOperationException(); } |
98 |
|
|
* }}</pre> |
99 |
|
|
* |
100 |
dl |
1.1 |
* @author Doug Lea |
101 |
|
|
* @since 1.8 |
102 |
|
|
*/ |
103 |
dl |
1.88 |
public class CompletableFuture<T> implements Future<T>, CompletionStage<T> { |
104 |
dl |
1.28 |
|
105 |
dl |
1.1 |
/* |
106 |
dl |
1.20 |
* Overview: |
107 |
dl |
1.1 |
* |
108 |
dl |
1.104 |
* A CompletableFuture may have dependent completion actions, |
109 |
|
|
* collected in a linked stack. It atomically completes by CASing |
110 |
|
|
* a result field, and then pops off and runs those actions. This |
111 |
|
|
* applies across normal vs exceptional outcomes, sync vs async |
112 |
|
|
* actions, binary triggers, and various forms of completions. |
113 |
|
|
* |
114 |
|
|
* Non-nullness of field result (set via CAS) indicates done. An |
115 |
|
|
* AltResult is used to box null as a result, as well as to hold |
116 |
|
|
* exceptions. Using a single field makes completion simple to |
117 |
|
|
* detect and trigger. Encoding and decoding is straightforward |
118 |
dl |
1.113 |
* but adds to the sprawl of trapping and associating exceptions |
119 |
|
|
* with targets. Minor simplifications rely on (static) NIL (to |
120 |
|
|
* box null results) being the only AltResult with a null |
121 |
|
|
* exception field, so we don't usually need explicit comparisons. |
122 |
|
|
* Even though some of the generics casts are unchecked (see |
123 |
|
|
* SuppressWarnings annotations), they are placed to be |
124 |
|
|
* appropriate even if checked. |
125 |
dl |
1.104 |
* |
126 |
|
|
* Dependent actions are represented by Completion objects linked |
127 |
dl |
1.113 |
* as Treiber stacks headed by field "stack". There are Completion |
128 |
|
|
* classes for each kind of action, grouped into single-input |
129 |
|
|
* (UniCompletion), two-input (BiCompletion), projected |
130 |
|
|
* (BiCompletions using either (not both) of two inputs), shared |
131 |
|
|
* (CoCompletion, used by the second of two sources), zero-input |
132 |
|
|
* source actions, and Signallers that unblock waiters. Class |
133 |
|
|
* Completion extends ForkJoinTask to enable async execution |
134 |
|
|
* (adding no space overhead because we exploit its "tag" methods |
135 |
|
|
* to maintain claims). It is also declared as Runnable to allow |
136 |
|
|
* usage with arbitrary executors. |
137 |
|
|
* |
138 |
|
|
* Support for each kind of CompletionStage relies on a separate |
139 |
|
|
* class, along with two CompletableFuture methods: |
140 |
|
|
* |
141 |
|
|
* * A Completion class with name X corresponding to function, |
142 |
|
|
* prefaced with "Uni", "Bi", or "Or". Each class contains |
143 |
|
|
* fields for source(s), actions, and dependent. They are |
144 |
|
|
* boringly similar, differing from others only with respect to |
145 |
|
|
* underlying functional forms. We do this so that users don't |
146 |
dl |
1.143 |
* encounter layers of adaptors in common usages. |
147 |
dl |
1.113 |
* |
148 |
|
|
* * Boolean CompletableFuture method x(...) (for example |
149 |
|
|
* uniApply) takes all of the arguments needed to check that an |
150 |
|
|
* action is triggerable, and then either runs the action or |
151 |
|
|
* arranges its async execution by executing its Completion |
152 |
|
|
* argument, if present. The method returns true if known to be |
153 |
|
|
* complete. |
154 |
|
|
* |
155 |
|
|
* * Completion method tryFire(int mode) invokes the associated x |
156 |
|
|
* method with its held arguments, and on success cleans up. |
157 |
jsr166 |
1.130 |
* The mode argument allows tryFire to be called twice (SYNC, |
158 |
|
|
* then ASYNC); the first to screen and trap exceptions while |
159 |
dl |
1.113 |
* arranging to execute, and the second when called from a |
160 |
|
|
* task. (A few classes are not used async so take slightly |
161 |
|
|
* different forms.) The claim() callback suppresses function |
162 |
|
|
* invocation if already claimed by another thread. |
163 |
|
|
* |
164 |
|
|
* * CompletableFuture method xStage(...) is called from a public |
165 |
|
|
* stage method of CompletableFuture x. It screens user |
166 |
|
|
* arguments and invokes and/or creates the stage object. If |
167 |
|
|
* not async and x is already complete, the action is run |
168 |
|
|
* immediately. Otherwise a Completion c is created, pushed to |
169 |
|
|
* x's stack (unless done), and started or triggered via |
170 |
|
|
* c.tryFire. This also covers races possible if x completes |
171 |
|
|
* while pushing. Classes with two inputs (for example BiApply) |
172 |
|
|
* deal with races across both while pushing actions. The |
173 |
|
|
* second completion is a CoCompletion pointing to the first, |
174 |
|
|
* shared so that at most one performs the action. The |
175 |
|
|
* multiple-arity methods allOf and anyOf do this pairwise to |
176 |
|
|
* form trees of completions. |
177 |
|
|
* |
178 |
|
|
* Note that the generic type parameters of methods vary according |
179 |
|
|
* to whether "this" is a source, dependent, or completion. |
180 |
|
|
* |
181 |
|
|
* Method postComplete is called upon completion unless the target |
182 |
|
|
* is guaranteed not to be observable (i.e., not yet returned or |
183 |
|
|
* linked). Multiple threads can call postComplete, which |
184 |
|
|
* atomically pops each dependent action, and tries to trigger it |
185 |
jsr166 |
1.130 |
* via method tryFire, in NESTED mode. Triggering can propagate |
186 |
|
|
* recursively, so NESTED mode returns its completed dependent (if |
187 |
|
|
* one exists) for further processing by its caller (see method |
188 |
|
|
* postFire). |
189 |
dl |
1.104 |
* |
190 |
|
|
* Blocking methods get() and join() rely on Signaller Completions |
191 |
|
|
* that wake up waiting threads. The mechanics are similar to |
192 |
|
|
* Treiber stack wait-nodes used in FutureTask, Phaser, and |
193 |
|
|
* SynchronousQueue. See their internal documentation for |
194 |
|
|
* algorithmic details. |
195 |
|
|
* |
196 |
|
|
* Without precautions, CompletableFutures would be prone to |
197 |
dl |
1.113 |
* garbage accumulation as chains of Completions build up, each |
198 |
|
|
* pointing back to its sources. So we null out fields as soon as |
199 |
|
|
* possible (see especially method Completion.detach). The |
200 |
|
|
* screening checks needed anyway harmlessly ignore null arguments |
201 |
dl |
1.104 |
* that may have been obtained during races with threads nulling |
202 |
dl |
1.113 |
* out fields. We also try to unlink fired Completions from |
203 |
|
|
* stacks that might never be popped (see method postFire). |
204 |
|
|
* Completion fields need not be declared as final or volatile |
205 |
|
|
* because they are only visible to other threads upon safe |
206 |
|
|
* publication. |
207 |
dl |
1.104 |
*/ |
208 |
|
|
|
209 |
dl |
1.113 |
volatile Object result; // Either the result or boxed AltResult |
210 |
|
|
volatile Completion stack; // Top of Treiber stack of dependent actions |
211 |
dl |
1.104 |
|
212 |
|
|
final boolean internalComplete(Object r) { // CAS from null to r |
213 |
jsr166 |
1.138 |
return U.compareAndSwapObject(this, RESULT, null, r); |
214 |
dl |
1.104 |
} |
215 |
|
|
|
216 |
dl |
1.113 |
final boolean casStack(Completion cmp, Completion val) { |
217 |
jsr166 |
1.138 |
return U.compareAndSwapObject(this, STACK, cmp, val); |
218 |
dl |
1.104 |
} |
219 |
|
|
|
220 |
jsr166 |
1.129 |
/** Returns true if successfully pushed c onto stack. */ |
221 |
|
|
final boolean tryPushStack(Completion c) { |
222 |
|
|
Completion h = stack; |
223 |
jsr166 |
1.134 |
lazySetNext(c, h); |
224 |
jsr166 |
1.138 |
return U.compareAndSwapObject(this, STACK, h, c); |
225 |
jsr166 |
1.129 |
} |
226 |
|
|
|
227 |
|
|
/** Unconditionally pushes c onto stack, retrying if necessary. */ |
228 |
|
|
final void pushStack(Completion c) { |
229 |
|
|
do {} while (!tryPushStack(c)); |
230 |
|
|
} |
231 |
|
|
|
232 |
dl |
1.104 |
/* ------------- Encoding and decoding outcomes -------------- */ |
233 |
|
|
|
234 |
|
|
static final class AltResult { // See above |
235 |
|
|
final Throwable ex; // null only for NIL |
236 |
|
|
AltResult(Throwable x) { this.ex = x; } |
237 |
dl |
1.1 |
} |
238 |
|
|
|
239 |
jsr166 |
1.128 |
/** The encoding of the null value. */ |
240 |
dl |
1.1 |
static final AltResult NIL = new AltResult(null); |
241 |
|
|
|
242 |
jsr166 |
1.128 |
/** Completes with the null value, unless already completed. */ |
243 |
|
|
final boolean completeNull() { |
244 |
jsr166 |
1.138 |
return U.compareAndSwapObject(this, RESULT, null, |
245 |
jsr166 |
1.141 |
NIL); |
246 |
jsr166 |
1.128 |
} |
247 |
|
|
|
248 |
|
|
/** Returns the encoding of the given non-exceptional value. */ |
249 |
|
|
final Object encodeValue(T t) { |
250 |
|
|
return (t == null) ? NIL : t; |
251 |
|
|
} |
252 |
|
|
|
253 |
|
|
/** Completes with a non-exceptional result, unless already completed. */ |
254 |
|
|
final boolean completeValue(T t) { |
255 |
jsr166 |
1.138 |
return U.compareAndSwapObject(this, RESULT, null, |
256 |
jsr166 |
1.141 |
(t == null) ? NIL : t); |
257 |
jsr166 |
1.128 |
} |
258 |
|
|
|
259 |
dl |
1.20 |
/** |
260 |
dl |
1.104 |
* Returns the encoding of the given (non-null) exception as a |
261 |
|
|
* wrapped CompletionException unless it is one already. |
262 |
dl |
1.99 |
*/ |
263 |
dl |
1.113 |
static AltResult encodeThrowable(Throwable x) { |
264 |
dl |
1.104 |
return new AltResult((x instanceof CompletionException) ? x : |
265 |
|
|
new CompletionException(x)); |
266 |
dl |
1.99 |
} |
267 |
|
|
|
268 |
jsr166 |
1.128 |
/** Completes with an exceptional result, unless already completed. */ |
269 |
|
|
final boolean completeThrowable(Throwable x) { |
270 |
jsr166 |
1.138 |
return U.compareAndSwapObject(this, RESULT, null, |
271 |
jsr166 |
1.141 |
encodeThrowable(x)); |
272 |
jsr166 |
1.128 |
} |
273 |
|
|
|
274 |
|
|
/** |
275 |
|
|
* Returns the encoding of the given (non-null) exception as a |
276 |
|
|
* wrapped CompletionException unless it is one already. May |
277 |
|
|
* return the given Object r (which must have been the result of a |
278 |
|
|
* source future) if it is equivalent, i.e. if this is a simple |
279 |
|
|
* relay of an existing CompletionException. |
280 |
|
|
*/ |
281 |
|
|
static Object encodeThrowable(Throwable x, Object r) { |
282 |
|
|
if (!(x instanceof CompletionException)) |
283 |
|
|
x = new CompletionException(x); |
284 |
|
|
else if (r instanceof AltResult && x == ((AltResult)r).ex) |
285 |
|
|
return r; |
286 |
|
|
return new AltResult(x); |
287 |
|
|
} |
288 |
|
|
|
289 |
|
|
/** |
290 |
|
|
* Completes with the given (non-null) exceptional result as a |
291 |
|
|
* wrapped CompletionException unless it is one already, unless |
292 |
|
|
* already completed. May complete with the given Object r |
293 |
|
|
* (which must have been the result of a source future) if it is |
294 |
|
|
* equivalent, i.e. if this is a simple propagation of an |
295 |
|
|
* existing CompletionException. |
296 |
|
|
*/ |
297 |
|
|
final boolean completeThrowable(Throwable x, Object r) { |
298 |
jsr166 |
1.138 |
return U.compareAndSwapObject(this, RESULT, null, |
299 |
jsr166 |
1.141 |
encodeThrowable(x, r)); |
300 |
jsr166 |
1.128 |
} |
301 |
|
|
|
302 |
dl |
1.99 |
/** |
303 |
dl |
1.104 |
* Returns the encoding of the given arguments: if the exception |
304 |
dl |
1.113 |
* is non-null, encodes as AltResult. Otherwise uses the given |
305 |
dl |
1.104 |
* value, boxed as NIL if null. |
306 |
dl |
1.99 |
*/ |
307 |
jsr166 |
1.127 |
Object encodeOutcome(T t, Throwable x) { |
308 |
|
|
return (x == null) ? (t == null) ? NIL : t : encodeThrowable(x); |
309 |
dl |
1.20 |
} |
310 |
|
|
|
311 |
dl |
1.1 |
/** |
312 |
jsr166 |
1.115 |
* Returns the encoding of a copied outcome; if exceptional, |
313 |
dl |
1.113 |
* rewraps as a CompletionException, else returns argument. |
314 |
dl |
1.1 |
*/ |
315 |
dl |
1.113 |
static Object encodeRelay(Object r) { |
316 |
|
|
Throwable x; |
317 |
|
|
return (((r instanceof AltResult) && |
318 |
|
|
(x = ((AltResult)r).ex) != null && |
319 |
|
|
!(x instanceof CompletionException)) ? |
320 |
|
|
new AltResult(new CompletionException(x)) : r); |
321 |
dl |
1.1 |
} |
322 |
|
|
|
323 |
|
|
/** |
324 |
jsr166 |
1.128 |
* Completes with r or a copy of r, unless already completed. |
325 |
|
|
* If exceptional, r is first coerced to a CompletionException. |
326 |
|
|
*/ |
327 |
|
|
final boolean completeRelay(Object r) { |
328 |
jsr166 |
1.138 |
return U.compareAndSwapObject(this, RESULT, null, |
329 |
jsr166 |
1.141 |
encodeRelay(r)); |
330 |
jsr166 |
1.128 |
} |
331 |
|
|
|
332 |
|
|
/** |
333 |
jsr166 |
1.108 |
* Reports result using Future.get conventions. |
334 |
dl |
1.1 |
*/ |
335 |
dl |
1.104 |
private static <T> T reportGet(Object r) |
336 |
|
|
throws InterruptedException, ExecutionException { |
337 |
|
|
if (r == null) // by convention below, null means interrupted |
338 |
|
|
throw new InterruptedException(); |
339 |
|
|
if (r instanceof AltResult) { |
340 |
|
|
Throwable x, cause; |
341 |
|
|
if ((x = ((AltResult)r).ex) == null) |
342 |
dl |
1.28 |
return null; |
343 |
dl |
1.104 |
if (x instanceof CancellationException) |
344 |
|
|
throw (CancellationException)x; |
345 |
|
|
if ((x instanceof CompletionException) && |
346 |
|
|
(cause = x.getCause()) != null) |
347 |
|
|
x = cause; |
348 |
|
|
throw new ExecutionException(x); |
349 |
dl |
1.28 |
} |
350 |
dl |
1.113 |
@SuppressWarnings("unchecked") T t = (T) r; |
351 |
|
|
return t; |
352 |
dl |
1.1 |
} |
353 |
|
|
|
354 |
dl |
1.113 |
/** |
355 |
|
|
* Decodes outcome to return result or throw unchecked exception. |
356 |
|
|
*/ |
357 |
|
|
private static <T> T reportJoin(Object r) { |
358 |
|
|
if (r instanceof AltResult) { |
359 |
|
|
Throwable x; |
360 |
|
|
if ((x = ((AltResult)r).ex) == null) |
361 |
|
|
return null; |
362 |
|
|
if (x instanceof CancellationException) |
363 |
|
|
throw (CancellationException)x; |
364 |
|
|
if (x instanceof CompletionException) |
365 |
|
|
throw (CompletionException)x; |
366 |
|
|
throw new CompletionException(x); |
367 |
|
|
} |
368 |
|
|
@SuppressWarnings("unchecked") T t = (T) r; |
369 |
|
|
return t; |
370 |
|
|
} |
371 |
|
|
|
372 |
jsr166 |
1.123 |
/* ------------- Async task preliminaries -------------- */ |
373 |
dl |
1.104 |
|
374 |
dl |
1.1 |
/** |
375 |
jsr166 |
1.56 |
* A marker interface identifying asynchronous tasks produced by |
376 |
dl |
1.28 |
* {@code async} methods. This may be useful for monitoring, |
377 |
|
|
* debugging, and tracking asynchronous activities. |
378 |
jsr166 |
1.57 |
* |
379 |
|
|
* @since 1.8 |
380 |
dl |
1.1 |
*/ |
381 |
dl |
1.28 |
public static interface AsynchronousCompletionTask { |
382 |
dl |
1.1 |
} |
383 |
|
|
|
384 |
jsr166 |
1.127 |
private static final boolean useCommonPool = |
385 |
|
|
(ForkJoinPool.getCommonPoolParallelism() > 1); |
386 |
|
|
|
387 |
dl |
1.104 |
/** |
388 |
dl |
1.109 |
* Default executor -- ForkJoinPool.commonPool() unless it cannot |
389 |
|
|
* support parallelism. |
390 |
|
|
*/ |
391 |
jsr166 |
1.127 |
private static final Executor asyncPool = useCommonPool ? |
392 |
dl |
1.109 |
ForkJoinPool.commonPool() : new ThreadPerTaskExecutor(); |
393 |
|
|
|
394 |
|
|
/** Fallback if ForkJoinPool.commonPool() cannot support parallelism */ |
395 |
|
|
static final class ThreadPerTaskExecutor implements Executor { |
396 |
|
|
public void execute(Runnable r) { new Thread(r).start(); } |
397 |
|
|
} |
398 |
|
|
|
399 |
|
|
/** |
400 |
|
|
* Null-checks user executor argument, and translates uses of |
401 |
|
|
* commonPool to asyncPool in case parallelism disabled. |
402 |
|
|
*/ |
403 |
|
|
static Executor screenExecutor(Executor e) { |
404 |
jsr166 |
1.127 |
if (!useCommonPool && e == ForkJoinPool.commonPool()) |
405 |
|
|
return asyncPool; |
406 |
dl |
1.109 |
if (e == null) throw new NullPointerException(); |
407 |
jsr166 |
1.127 |
return e; |
408 |
dl |
1.109 |
} |
409 |
|
|
|
410 |
jsr166 |
1.130 |
// Modes for Completion.tryFire. Signedness matters. |
411 |
dl |
1.113 |
static final int SYNC = 0; |
412 |
|
|
static final int ASYNC = 1; |
413 |
|
|
static final int NESTED = -1; |
414 |
dl |
1.104 |
|
415 |
dl |
1.113 |
/* ------------- Base Completion classes and operations -------------- */ |
416 |
|
|
|
417 |
|
|
@SuppressWarnings("serial") |
418 |
|
|
abstract static class Completion extends ForkJoinTask<Void> |
419 |
|
|
implements Runnable, AsynchronousCompletionTask { |
420 |
dl |
1.110 |
volatile Completion next; // Treiber stack link |
421 |
dl |
1.104 |
|
422 |
|
|
/** |
423 |
dl |
1.113 |
* Performs completion action if triggered, returning a |
424 |
|
|
* dependent that may need propagation, if one exists. |
425 |
|
|
* |
426 |
|
|
* @param mode SYNC, ASYNC, or NESTED |
427 |
dl |
1.104 |
*/ |
428 |
dl |
1.113 |
abstract CompletableFuture<?> tryFire(int mode); |
429 |
|
|
|
430 |
jsr166 |
1.116 |
/** Returns true if possibly still triggerable. Used by cleanStack. */ |
431 |
dl |
1.113 |
abstract boolean isLive(); |
432 |
|
|
|
433 |
|
|
public final void run() { tryFire(ASYNC); } |
434 |
|
|
public final boolean exec() { tryFire(ASYNC); return true; } |
435 |
|
|
public final Void getRawResult() { return null; } |
436 |
|
|
public final void setRawResult(Void v) {} |
437 |
jsr166 |
1.134 |
} |
438 |
jsr166 |
1.129 |
|
439 |
jsr166 |
1.134 |
static void lazySetNext(Completion c, Completion next) { |
440 |
jsr166 |
1.138 |
U.putOrderedObject(c, NEXT, next); |
441 |
dl |
1.96 |
} |
442 |
|
|
|
443 |
dl |
1.104 |
/** |
444 |
dl |
1.113 |
* Pops and tries to trigger all reachable dependents. Call only |
445 |
|
|
* when known to be done. |
446 |
dl |
1.104 |
*/ |
447 |
|
|
final void postComplete() { |
448 |
|
|
/* |
449 |
dl |
1.113 |
* On each step, variable f holds current dependents to pop |
450 |
dl |
1.104 |
* and run. It is extended along only one path at a time, |
451 |
dl |
1.113 |
* pushing others to avoid unbounded recursion. |
452 |
dl |
1.104 |
*/ |
453 |
dl |
1.110 |
CompletableFuture<?> f = this; Completion h; |
454 |
dl |
1.113 |
while ((h = f.stack) != null || |
455 |
|
|
(f != this && (h = (f = this).stack) != null)) { |
456 |
dl |
1.110 |
CompletableFuture<?> d; Completion t; |
457 |
dl |
1.113 |
if (f.casStack(h, t = h.next)) { |
458 |
dl |
1.104 |
if (t != null) { |
459 |
jsr166 |
1.129 |
if (f != this) { |
460 |
|
|
pushStack(h); |
461 |
dl |
1.104 |
continue; |
462 |
|
|
} |
463 |
|
|
h.next = null; // detach |
464 |
dl |
1.28 |
} |
465 |
dl |
1.113 |
f = (d = h.tryFire(NESTED)) == null ? this : d; |
466 |
dl |
1.19 |
} |
467 |
|
|
} |
468 |
|
|
} |
469 |
|
|
|
470 |
dl |
1.113 |
/** Traverses stack and unlinks dead Completions. */ |
471 |
|
|
final void cleanStack() { |
472 |
|
|
for (Completion p = null, q = stack; q != null;) { |
473 |
|
|
Completion s = q.next; |
474 |
|
|
if (q.isLive()) { |
475 |
|
|
p = q; |
476 |
|
|
q = s; |
477 |
|
|
} |
478 |
|
|
else if (p == null) { |
479 |
|
|
casStack(q, s); |
480 |
|
|
q = stack; |
481 |
|
|
} |
482 |
|
|
else { |
483 |
|
|
p.next = s; |
484 |
|
|
if (p.isLive()) |
485 |
|
|
q = s; |
486 |
|
|
else { |
487 |
|
|
p = null; // restart |
488 |
|
|
q = stack; |
489 |
|
|
} |
490 |
|
|
} |
491 |
|
|
} |
492 |
|
|
} |
493 |
|
|
|
494 |
|
|
/* ------------- One-input Completions -------------- */ |
495 |
dl |
1.104 |
|
496 |
dl |
1.113 |
/** A Completion with a source, dependent, and executor. */ |
497 |
|
|
@SuppressWarnings("serial") |
498 |
jsr166 |
1.124 |
abstract static class UniCompletion<T,V> extends Completion { |
499 |
dl |
1.113 |
Executor executor; // executor to use (null if none) |
500 |
jsr166 |
1.124 |
CompletableFuture<V> dep; // the dependent to complete |
501 |
|
|
CompletableFuture<T> src; // source for action |
502 |
dl |
1.104 |
|
503 |
jsr166 |
1.124 |
UniCompletion(Executor executor, CompletableFuture<V> dep, |
504 |
|
|
CompletableFuture<T> src) { |
505 |
dl |
1.113 |
this.executor = executor; this.dep = dep; this.src = src; |
506 |
dl |
1.104 |
} |
507 |
|
|
|
508 |
dl |
1.113 |
/** |
509 |
|
|
* Returns true if action can be run. Call only when known to |
510 |
|
|
* be triggerable. Uses FJ tag bit to ensure that only one |
511 |
|
|
* thread claims ownership. If async, starts as task -- a |
512 |
|
|
* later call to tryFire will run action. |
513 |
|
|
*/ |
514 |
|
|
final boolean claim() { |
515 |
|
|
Executor e = executor; |
516 |
|
|
if (compareAndSetForkJoinTaskTag((short)0, (short)1)) { |
517 |
|
|
if (e == null) |
518 |
|
|
return true; |
519 |
|
|
executor = null; // disable |
520 |
|
|
e.execute(this); |
521 |
|
|
} |
522 |
|
|
return false; |
523 |
dl |
1.104 |
} |
524 |
|
|
|
525 |
dl |
1.113 |
final boolean isLive() { return dep != null; } |
526 |
dl |
1.1 |
} |
527 |
|
|
|
528 |
dl |
1.113 |
/** Pushes the given completion (if it exists) unless done. */ |
529 |
jsr166 |
1.124 |
final void push(UniCompletion<?,?> c) { |
530 |
dl |
1.104 |
if (c != null) { |
531 |
jsr166 |
1.129 |
while (result == null && !tryPushStack(c)) |
532 |
jsr166 |
1.134 |
lazySetNext(c, null); // clear on failure |
533 |
dl |
1.104 |
} |
534 |
|
|
} |
535 |
|
|
|
536 |
dl |
1.113 |
/** |
537 |
|
|
* Post-processing by dependent after successful UniCompletion |
538 |
|
|
* tryFire. Tries to clean stack of source a, and then either runs |
539 |
|
|
* postComplete or returns this to caller, depending on mode. |
540 |
|
|
*/ |
541 |
|
|
final CompletableFuture<T> postFire(CompletableFuture<?> a, int mode) { |
542 |
|
|
if (a != null && a.stack != null) { |
543 |
|
|
if (mode < 0 || a.result == null) |
544 |
|
|
a.cleanStack(); |
545 |
dl |
1.104 |
else |
546 |
dl |
1.113 |
a.postComplete(); |
547 |
dl |
1.1 |
} |
548 |
dl |
1.113 |
if (result != null && stack != null) { |
549 |
|
|
if (mode < 0) |
550 |
|
|
return this; |
551 |
|
|
else |
552 |
|
|
postComplete(); |
553 |
dl |
1.1 |
} |
554 |
dl |
1.113 |
return null; |
555 |
dl |
1.1 |
} |
556 |
|
|
|
557 |
dl |
1.113 |
@SuppressWarnings("serial") |
558 |
jsr166 |
1.124 |
static final class UniApply<T,V> extends UniCompletion<T,V> { |
559 |
|
|
Function<? super T,? extends V> fn; |
560 |
|
|
UniApply(Executor executor, CompletableFuture<V> dep, |
561 |
|
|
CompletableFuture<T> src, |
562 |
|
|
Function<? super T,? extends V> fn) { |
563 |
dl |
1.113 |
super(executor, dep, src); this.fn = fn; |
564 |
|
|
} |
565 |
jsr166 |
1.124 |
final CompletableFuture<V> tryFire(int mode) { |
566 |
|
|
CompletableFuture<V> d; CompletableFuture<T> a; |
567 |
dl |
1.113 |
if ((d = dep) == null || |
568 |
|
|
!d.uniApply(a = src, fn, mode > 0 ? null : this)) |
569 |
|
|
return null; |
570 |
|
|
dep = null; src = null; fn = null; |
571 |
|
|
return d.postFire(a, mode); |
572 |
dl |
1.7 |
} |
573 |
|
|
} |
574 |
|
|
|
575 |
jsr166 |
1.124 |
final <S> boolean uniApply(CompletableFuture<S> a, |
576 |
dl |
1.113 |
Function<? super S,? extends T> f, |
577 |
|
|
UniApply<S,T> c) { |
578 |
jsr166 |
1.127 |
Object r; Throwable x; |
579 |
dl |
1.113 |
if (a == null || (r = a.result) == null || f == null) |
580 |
|
|
return false; |
581 |
jsr166 |
1.128 |
tryComplete: if (result == null) { |
582 |
|
|
if (r instanceof AltResult) { |
583 |
|
|
if ((x = ((AltResult)r).ex) != null) { |
584 |
|
|
completeThrowable(x, r); |
585 |
|
|
break tryComplete; |
586 |
|
|
} |
587 |
|
|
r = null; |
588 |
|
|
} |
589 |
|
|
try { |
590 |
jsr166 |
1.127 |
if (c != null && !c.claim()) |
591 |
dl |
1.113 |
return false; |
592 |
jsr166 |
1.127 |
@SuppressWarnings("unchecked") S s = (S) r; |
593 |
|
|
completeValue(f.apply(s)); |
594 |
dl |
1.113 |
} catch (Throwable ex) { |
595 |
jsr166 |
1.128 |
completeThrowable(ex); |
596 |
dl |
1.7 |
} |
597 |
|
|
} |
598 |
dl |
1.113 |
return true; |
599 |
dl |
1.7 |
} |
600 |
|
|
|
601 |
jsr166 |
1.124 |
private <V> CompletableFuture<V> uniApplyStage( |
602 |
|
|
Executor e, Function<? super T,? extends V> f) { |
603 |
dl |
1.113 |
if (f == null) throw new NullPointerException(); |
604 |
dl |
1.143 |
CompletableFuture<V> d = newIncompleteFuture(); |
605 |
dl |
1.113 |
if (e != null || !d.uniApply(this, f, null)) { |
606 |
jsr166 |
1.124 |
UniApply<T,V> c = new UniApply<T,V>(e, d, this, f); |
607 |
dl |
1.113 |
push(c); |
608 |
|
|
c.tryFire(SYNC); |
609 |
dl |
1.37 |
} |
610 |
dl |
1.113 |
return d; |
611 |
dl |
1.37 |
} |
612 |
|
|
|
613 |
dl |
1.113 |
@SuppressWarnings("serial") |
614 |
jsr166 |
1.124 |
static final class UniAccept<T> extends UniCompletion<T,Void> { |
615 |
dl |
1.104 |
Consumer<? super T> fn; |
616 |
dl |
1.113 |
UniAccept(Executor executor, CompletableFuture<Void> dep, |
617 |
jsr166 |
1.124 |
CompletableFuture<T> src, Consumer<? super T> fn) { |
618 |
dl |
1.113 |
super(executor, dep, src); this.fn = fn; |
619 |
|
|
} |
620 |
jsr166 |
1.124 |
final CompletableFuture<Void> tryFire(int mode) { |
621 |
|
|
CompletableFuture<Void> d; CompletableFuture<T> a; |
622 |
dl |
1.113 |
if ((d = dep) == null || |
623 |
|
|
!d.uniAccept(a = src, fn, mode > 0 ? null : this)) |
624 |
|
|
return null; |
625 |
|
|
dep = null; src = null; fn = null; |
626 |
|
|
return d.postFire(a, mode); |
627 |
dl |
1.91 |
} |
628 |
|
|
} |
629 |
|
|
|
630 |
jsr166 |
1.124 |
final <S> boolean uniAccept(CompletableFuture<S> a, |
631 |
dl |
1.113 |
Consumer<? super S> f, UniAccept<S> c) { |
632 |
|
|
Object r; Throwable x; |
633 |
|
|
if (a == null || (r = a.result) == null || f == null) |
634 |
|
|
return false; |
635 |
jsr166 |
1.128 |
tryComplete: if (result == null) { |
636 |
|
|
if (r instanceof AltResult) { |
637 |
|
|
if ((x = ((AltResult)r).ex) != null) { |
638 |
|
|
completeThrowable(x, r); |
639 |
|
|
break tryComplete; |
640 |
|
|
} |
641 |
|
|
r = null; |
642 |
|
|
} |
643 |
|
|
try { |
644 |
jsr166 |
1.127 |
if (c != null && !c.claim()) |
645 |
|
|
return false; |
646 |
|
|
@SuppressWarnings("unchecked") S s = (S) r; |
647 |
|
|
f.accept(s); |
648 |
jsr166 |
1.128 |
completeNull(); |
649 |
dl |
1.113 |
} catch (Throwable ex) { |
650 |
jsr166 |
1.128 |
completeThrowable(ex); |
651 |
dl |
1.1 |
} |
652 |
|
|
} |
653 |
dl |
1.113 |
return true; |
654 |
dl |
1.1 |
} |
655 |
|
|
|
656 |
dl |
1.113 |
private CompletableFuture<Void> uniAcceptStage(Executor e, |
657 |
|
|
Consumer<? super T> f) { |
658 |
|
|
if (f == null) throw new NullPointerException(); |
659 |
dl |
1.143 |
CompletableFuture<Void> d = newIncompleteFuture(); |
660 |
dl |
1.113 |
if (e != null || !d.uniAccept(this, f, null)) { |
661 |
|
|
UniAccept<T> c = new UniAccept<T>(e, d, this, f); |
662 |
|
|
push(c); |
663 |
|
|
c.tryFire(SYNC); |
664 |
dl |
1.7 |
} |
665 |
dl |
1.113 |
return d; |
666 |
dl |
1.7 |
} |
667 |
|
|
|
668 |
dl |
1.113 |
@SuppressWarnings("serial") |
669 |
jsr166 |
1.124 |
static final class UniRun<T> extends UniCompletion<T,Void> { |
670 |
jsr166 |
1.105 |
Runnable fn; |
671 |
dl |
1.113 |
UniRun(Executor executor, CompletableFuture<Void> dep, |
672 |
jsr166 |
1.124 |
CompletableFuture<T> src, Runnable fn) { |
673 |
dl |
1.113 |
super(executor, dep, src); this.fn = fn; |
674 |
|
|
} |
675 |
jsr166 |
1.124 |
final CompletableFuture<Void> tryFire(int mode) { |
676 |
|
|
CompletableFuture<Void> d; CompletableFuture<T> a; |
677 |
dl |
1.113 |
if ((d = dep) == null || |
678 |
|
|
!d.uniRun(a = src, fn, mode > 0 ? null : this)) |
679 |
|
|
return null; |
680 |
|
|
dep = null; src = null; fn = null; |
681 |
|
|
return d.postFire(a, mode); |
682 |
dl |
1.1 |
} |
683 |
|
|
} |
684 |
|
|
|
685 |
jsr166 |
1.124 |
final boolean uniRun(CompletableFuture<?> a, Runnable f, UniRun<?> c) { |
686 |
dl |
1.113 |
Object r; Throwable x; |
687 |
|
|
if (a == null || (r = a.result) == null || f == null) |
688 |
|
|
return false; |
689 |
|
|
if (result == null) { |
690 |
jsr166 |
1.128 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) |
691 |
|
|
completeThrowable(x, r); |
692 |
|
|
else |
693 |
|
|
try { |
694 |
|
|
if (c != null && !c.claim()) |
695 |
|
|
return false; |
696 |
|
|
f.run(); |
697 |
|
|
completeNull(); |
698 |
|
|
} catch (Throwable ex) { |
699 |
|
|
completeThrowable(ex); |
700 |
|
|
} |
701 |
jsr166 |
1.2 |
} |
702 |
dl |
1.113 |
return true; |
703 |
dl |
1.1 |
} |
704 |
|
|
|
705 |
dl |
1.113 |
private CompletableFuture<Void> uniRunStage(Executor e, Runnable f) { |
706 |
|
|
if (f == null) throw new NullPointerException(); |
707 |
dl |
1.143 |
CompletableFuture<Void> d = newIncompleteFuture(); |
708 |
dl |
1.113 |
if (e != null || !d.uniRun(this, f, null)) { |
709 |
jsr166 |
1.124 |
UniRun<T> c = new UniRun<T>(e, d, this, f); |
710 |
dl |
1.113 |
push(c); |
711 |
|
|
c.tryFire(SYNC); |
712 |
dl |
1.7 |
} |
713 |
dl |
1.113 |
return d; |
714 |
dl |
1.7 |
} |
715 |
|
|
|
716 |
dl |
1.113 |
@SuppressWarnings("serial") |
717 |
jsr166 |
1.124 |
static final class UniWhenComplete<T> extends UniCompletion<T,T> { |
718 |
dl |
1.113 |
BiConsumer<? super T, ? super Throwable> fn; |
719 |
|
|
UniWhenComplete(Executor executor, CompletableFuture<T> dep, |
720 |
jsr166 |
1.124 |
CompletableFuture<T> src, |
721 |
dl |
1.113 |
BiConsumer<? super T, ? super Throwable> fn) { |
722 |
|
|
super(executor, dep, src); this.fn = fn; |
723 |
|
|
} |
724 |
jsr166 |
1.124 |
final CompletableFuture<T> tryFire(int mode) { |
725 |
|
|
CompletableFuture<T> d; CompletableFuture<T> a; |
726 |
dl |
1.113 |
if ((d = dep) == null || |
727 |
|
|
!d.uniWhenComplete(a = src, fn, mode > 0 ? null : this)) |
728 |
|
|
return null; |
729 |
|
|
dep = null; src = null; fn = null; |
730 |
|
|
return d.postFire(a, mode); |
731 |
|
|
} |
732 |
|
|
} |
733 |
dl |
1.104 |
|
734 |
jsr166 |
1.124 |
final boolean uniWhenComplete(CompletableFuture<T> a, |
735 |
dl |
1.113 |
BiConsumer<? super T,? super Throwable> f, |
736 |
|
|
UniWhenComplete<T> c) { |
737 |
jsr166 |
1.127 |
Object r; T t; Throwable x = null; |
738 |
dl |
1.113 |
if (a == null || (r = a.result) == null || f == null) |
739 |
|
|
return false; |
740 |
|
|
if (result == null) { |
741 |
dl |
1.104 |
try { |
742 |
jsr166 |
1.127 |
if (c != null && !c.claim()) |
743 |
|
|
return false; |
744 |
dl |
1.113 |
if (r instanceof AltResult) { |
745 |
|
|
x = ((AltResult)r).ex; |
746 |
jsr166 |
1.127 |
t = null; |
747 |
|
|
} else { |
748 |
|
|
@SuppressWarnings("unchecked") T tr = (T) r; |
749 |
|
|
t = tr; |
750 |
dl |
1.113 |
} |
751 |
jsr166 |
1.127 |
f.accept(t, x); |
752 |
|
|
if (x == null) { |
753 |
|
|
internalComplete(r); |
754 |
|
|
return true; |
755 |
jsr166 |
1.2 |
} |
756 |
dl |
1.104 |
} catch (Throwable ex) { |
757 |
jsr166 |
1.127 |
if (x == null) |
758 |
|
|
x = ex; |
759 |
jsr166 |
1.2 |
} |
760 |
jsr166 |
1.128 |
completeThrowable(x, r); |
761 |
jsr166 |
1.2 |
} |
762 |
dl |
1.113 |
return true; |
763 |
dl |
1.1 |
} |
764 |
|
|
|
765 |
dl |
1.113 |
private CompletableFuture<T> uniWhenCompleteStage( |
766 |
|
|
Executor e, BiConsumer<? super T, ? super Throwable> f) { |
767 |
|
|
if (f == null) throw new NullPointerException(); |
768 |
dl |
1.143 |
CompletableFuture<T> d = newIncompleteFuture(); |
769 |
dl |
1.113 |
if (e != null || !d.uniWhenComplete(this, f, null)) { |
770 |
|
|
UniWhenComplete<T> c = new UniWhenComplete<T>(e, d, this, f); |
771 |
|
|
push(c); |
772 |
|
|
c.tryFire(SYNC); |
773 |
dl |
1.35 |
} |
774 |
dl |
1.113 |
return d; |
775 |
dl |
1.35 |
} |
776 |
|
|
|
777 |
dl |
1.113 |
@SuppressWarnings("serial") |
778 |
jsr166 |
1.124 |
static final class UniHandle<T,V> extends UniCompletion<T,V> { |
779 |
|
|
BiFunction<? super T, Throwable, ? extends V> fn; |
780 |
|
|
UniHandle(Executor executor, CompletableFuture<V> dep, |
781 |
|
|
CompletableFuture<T> src, |
782 |
|
|
BiFunction<? super T, Throwable, ? extends V> fn) { |
783 |
dl |
1.113 |
super(executor, dep, src); this.fn = fn; |
784 |
|
|
} |
785 |
jsr166 |
1.124 |
final CompletableFuture<V> tryFire(int mode) { |
786 |
|
|
CompletableFuture<V> d; CompletableFuture<T> a; |
787 |
dl |
1.113 |
if ((d = dep) == null || |
788 |
|
|
!d.uniHandle(a = src, fn, mode > 0 ? null : this)) |
789 |
|
|
return null; |
790 |
|
|
dep = null; src = null; fn = null; |
791 |
|
|
return d.postFire(a, mode); |
792 |
jsr166 |
1.2 |
} |
793 |
dl |
1.1 |
} |
794 |
|
|
|
795 |
jsr166 |
1.124 |
final <S> boolean uniHandle(CompletableFuture<S> a, |
796 |
dl |
1.113 |
BiFunction<? super S, Throwable, ? extends T> f, |
797 |
|
|
UniHandle<S,T> c) { |
798 |
jsr166 |
1.127 |
Object r; S s; Throwable x; |
799 |
dl |
1.113 |
if (a == null || (r = a.result) == null || f == null) |
800 |
|
|
return false; |
801 |
|
|
if (result == null) { |
802 |
dl |
1.104 |
try { |
803 |
jsr166 |
1.127 |
if (c != null && !c.claim()) |
804 |
|
|
return false; |
805 |
dl |
1.113 |
if (r instanceof AltResult) { |
806 |
|
|
x = ((AltResult)r).ex; |
807 |
jsr166 |
1.127 |
s = null; |
808 |
|
|
} else { |
809 |
dl |
1.113 |
x = null; |
810 |
jsr166 |
1.127 |
@SuppressWarnings("unchecked") S ss = (S) r; |
811 |
|
|
s = ss; |
812 |
dl |
1.1 |
} |
813 |
jsr166 |
1.127 |
completeValue(f.apply(s, x)); |
814 |
dl |
1.104 |
} catch (Throwable ex) { |
815 |
jsr166 |
1.127 |
completeThrowable(ex); |
816 |
jsr166 |
1.2 |
} |
817 |
|
|
} |
818 |
dl |
1.113 |
return true; |
819 |
dl |
1.1 |
} |
820 |
|
|
|
821 |
jsr166 |
1.124 |
private <V> CompletableFuture<V> uniHandleStage( |
822 |
|
|
Executor e, BiFunction<? super T, Throwable, ? extends V> f) { |
823 |
dl |
1.113 |
if (f == null) throw new NullPointerException(); |
824 |
dl |
1.143 |
CompletableFuture<V> d = newIncompleteFuture(); |
825 |
dl |
1.113 |
if (e != null || !d.uniHandle(this, f, null)) { |
826 |
jsr166 |
1.124 |
UniHandle<T,V> c = new UniHandle<T,V>(e, d, this, f); |
827 |
dl |
1.113 |
push(c); |
828 |
|
|
c.tryFire(SYNC); |
829 |
dl |
1.35 |
} |
830 |
dl |
1.104 |
return d; |
831 |
dl |
1.1 |
} |
832 |
|
|
|
833 |
dl |
1.113 |
@SuppressWarnings("serial") |
834 |
jsr166 |
1.124 |
static final class UniExceptionally<T> extends UniCompletion<T,T> { |
835 |
dl |
1.104 |
Function<? super Throwable, ? extends T> fn; |
836 |
jsr166 |
1.124 |
UniExceptionally(CompletableFuture<T> dep, CompletableFuture<T> src, |
837 |
dl |
1.113 |
Function<? super Throwable, ? extends T> fn) { |
838 |
dl |
1.104 |
super(null, dep, src); this.fn = fn; |
839 |
|
|
} |
840 |
jsr166 |
1.124 |
final CompletableFuture<T> tryFire(int mode) { // never ASYNC |
841 |
jsr166 |
1.128 |
// assert mode != ASYNC; |
842 |
jsr166 |
1.124 |
CompletableFuture<T> d; CompletableFuture<T> a; |
843 |
dl |
1.113 |
if ((d = dep) == null || !d.uniExceptionally(a = src, fn, this)) |
844 |
|
|
return null; |
845 |
|
|
dep = null; src = null; fn = null; |
846 |
|
|
return d.postFire(a, mode); |
847 |
dl |
1.17 |
} |
848 |
|
|
} |
849 |
|
|
|
850 |
jsr166 |
1.124 |
final boolean uniExceptionally(CompletableFuture<T> a, |
851 |
dl |
1.113 |
Function<? super Throwable, ? extends T> f, |
852 |
|
|
UniExceptionally<T> c) { |
853 |
jsr166 |
1.127 |
Object r; Throwable x; |
854 |
dl |
1.113 |
if (a == null || (r = a.result) == null || f == null) |
855 |
|
|
return false; |
856 |
|
|
if (result == null) { |
857 |
|
|
try { |
858 |
jsr166 |
1.127 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) { |
859 |
|
|
if (c != null && !c.claim()) |
860 |
|
|
return false; |
861 |
|
|
completeValue(f.apply(x)); |
862 |
|
|
} else |
863 |
|
|
internalComplete(r); |
864 |
dl |
1.113 |
} catch (Throwable ex) { |
865 |
jsr166 |
1.127 |
completeThrowable(ex); |
866 |
dl |
1.113 |
} |
867 |
|
|
} |
868 |
|
|
return true; |
869 |
dl |
1.75 |
} |
870 |
|
|
|
871 |
dl |
1.113 |
private CompletableFuture<T> uniExceptionallyStage( |
872 |
|
|
Function<Throwable, ? extends T> f) { |
873 |
|
|
if (f == null) throw new NullPointerException(); |
874 |
dl |
1.143 |
CompletableFuture<T> d = newIncompleteFuture(); |
875 |
dl |
1.113 |
if (!d.uniExceptionally(this, f, null)) { |
876 |
|
|
UniExceptionally<T> c = new UniExceptionally<T>(d, this, f); |
877 |
|
|
push(c); |
878 |
|
|
c.tryFire(SYNC); |
879 |
dl |
1.17 |
} |
880 |
dl |
1.113 |
return d; |
881 |
dl |
1.17 |
} |
882 |
|
|
|
883 |
dl |
1.113 |
@SuppressWarnings("serial") |
884 |
jsr166 |
1.124 |
static final class UniRelay<T> extends UniCompletion<T,T> { // for Compose |
885 |
|
|
UniRelay(CompletableFuture<T> dep, CompletableFuture<T> src) { |
886 |
dl |
1.104 |
super(null, dep, src); |
887 |
|
|
} |
888 |
jsr166 |
1.124 |
final CompletableFuture<T> tryFire(int mode) { |
889 |
|
|
CompletableFuture<T> d; CompletableFuture<T> a; |
890 |
dl |
1.113 |
if ((d = dep) == null || !d.uniRelay(a = src)) |
891 |
|
|
return null; |
892 |
|
|
src = null; dep = null; |
893 |
|
|
return d.postFire(a, mode); |
894 |
dl |
1.28 |
} |
895 |
|
|
} |
896 |
|
|
|
897 |
jsr166 |
1.124 |
final boolean uniRelay(CompletableFuture<T> a) { |
898 |
dl |
1.113 |
Object r; |
899 |
|
|
if (a == null || (r = a.result) == null) |
900 |
|
|
return false; |
901 |
|
|
if (result == null) // no need to claim |
902 |
jsr166 |
1.127 |
completeRelay(r); |
903 |
dl |
1.113 |
return true; |
904 |
|
|
} |
905 |
dl |
1.28 |
|
906 |
dl |
1.143 |
private CompletableFuture<T> uniCopyStage() { |
907 |
|
|
Object r; |
908 |
|
|
CompletableFuture<T> d = newIncompleteFuture(); |
909 |
|
|
if ((r = result) != null) |
910 |
|
|
d.completeRelay(r); |
911 |
|
|
else { |
912 |
|
|
UniRelay<T> c = new UniRelay<T>(d, this); |
913 |
|
|
push(c); |
914 |
|
|
c.tryFire(SYNC); |
915 |
|
|
} |
916 |
|
|
return d; |
917 |
|
|
} |
918 |
|
|
|
919 |
|
|
private MinimalStage<T> uniAsMinimalStage() { |
920 |
|
|
Object r; |
921 |
|
|
if ((r = result) != null) |
922 |
|
|
return new MinimalStage<T>(encodeRelay(r)); |
923 |
|
|
MinimalStage<T> d = new MinimalStage<T>(); |
924 |
|
|
UniRelay<T> c = new UniRelay<T>(d, this); |
925 |
|
|
push(c); |
926 |
|
|
c.tryFire(SYNC); |
927 |
|
|
return d; |
928 |
|
|
} |
929 |
|
|
|
930 |
dl |
1.113 |
@SuppressWarnings("serial") |
931 |
jsr166 |
1.124 |
static final class UniCompose<T,V> extends UniCompletion<T,V> { |
932 |
|
|
Function<? super T, ? extends CompletionStage<V>> fn; |
933 |
|
|
UniCompose(Executor executor, CompletableFuture<V> dep, |
934 |
|
|
CompletableFuture<T> src, |
935 |
|
|
Function<? super T, ? extends CompletionStage<V>> fn) { |
936 |
dl |
1.113 |
super(executor, dep, src); this.fn = fn; |
937 |
|
|
} |
938 |
jsr166 |
1.124 |
final CompletableFuture<V> tryFire(int mode) { |
939 |
|
|
CompletableFuture<V> d; CompletableFuture<T> a; |
940 |
dl |
1.113 |
if ((d = dep) == null || |
941 |
|
|
!d.uniCompose(a = src, fn, mode > 0 ? null : this)) |
942 |
|
|
return null; |
943 |
|
|
dep = null; src = null; fn = null; |
944 |
|
|
return d.postFire(a, mode); |
945 |
|
|
} |
946 |
|
|
} |
947 |
|
|
|
948 |
|
|
final <S> boolean uniCompose( |
949 |
jsr166 |
1.124 |
CompletableFuture<S> a, |
950 |
dl |
1.113 |
Function<? super S, ? extends CompletionStage<T>> f, |
951 |
|
|
UniCompose<S,T> c) { |
952 |
|
|
Object r; Throwable x; |
953 |
|
|
if (a == null || (r = a.result) == null || f == null) |
954 |
|
|
return false; |
955 |
jsr166 |
1.128 |
tryComplete: if (result == null) { |
956 |
|
|
if (r instanceof AltResult) { |
957 |
|
|
if ((x = ((AltResult)r).ex) != null) { |
958 |
|
|
completeThrowable(x, r); |
959 |
|
|
break tryComplete; |
960 |
|
|
} |
961 |
|
|
r = null; |
962 |
|
|
} |
963 |
|
|
try { |
964 |
jsr166 |
1.127 |
if (c != null && !c.claim()) |
965 |
|
|
return false; |
966 |
|
|
@SuppressWarnings("unchecked") S s = (S) r; |
967 |
|
|
CompletableFuture<T> g = f.apply(s).toCompletableFuture(); |
968 |
|
|
if (g.result == null || !uniRelay(g)) { |
969 |
|
|
UniRelay<T> copy = new UniRelay<T>(this, g); |
970 |
|
|
g.push(copy); |
971 |
|
|
copy.tryFire(SYNC); |
972 |
|
|
if (result == null) |
973 |
dl |
1.113 |
return false; |
974 |
dl |
1.88 |
} |
975 |
dl |
1.113 |
} catch (Throwable ex) { |
976 |
jsr166 |
1.128 |
completeThrowable(ex); |
977 |
dl |
1.88 |
} |
978 |
|
|
} |
979 |
dl |
1.113 |
return true; |
980 |
dl |
1.28 |
} |
981 |
|
|
|
982 |
jsr166 |
1.124 |
private <V> CompletableFuture<V> uniComposeStage( |
983 |
|
|
Executor e, Function<? super T, ? extends CompletionStage<V>> f) { |
984 |
dl |
1.113 |
if (f == null) throw new NullPointerException(); |
985 |
dl |
1.143 |
Object r, s; Throwable x; |
986 |
|
|
CompletableFuture<V> d = newIncompleteFuture(); |
987 |
jsr166 |
1.128 |
if (e == null && (r = result) != null) { |
988 |
|
|
if (r instanceof AltResult) { |
989 |
|
|
if ((x = ((AltResult)r).ex) != null) { |
990 |
dl |
1.143 |
d.result = encodeThrowable(x, r); |
991 |
|
|
return d; |
992 |
jsr166 |
1.128 |
} |
993 |
|
|
r = null; |
994 |
|
|
} |
995 |
|
|
try { |
996 |
jsr166 |
1.127 |
@SuppressWarnings("unchecked") T t = (T) r; |
997 |
dl |
1.140 |
CompletableFuture<V> g = f.apply(t).toCompletableFuture(); |
998 |
dl |
1.143 |
if ((s = g.result) != null) |
999 |
|
|
d.completeRelay(s); |
1000 |
|
|
else { |
1001 |
|
|
UniRelay<V> c = new UniRelay<V>(d, g); |
1002 |
|
|
push(c); |
1003 |
|
|
c.tryFire(SYNC); |
1004 |
|
|
} |
1005 |
dl |
1.140 |
return d; |
1006 |
dl |
1.113 |
} catch (Throwable ex) { |
1007 |
dl |
1.143 |
d.result = encodeThrowable(ex); |
1008 |
|
|
return d; |
1009 |
dl |
1.104 |
} |
1010 |
|
|
} |
1011 |
jsr166 |
1.128 |
UniCompose<T,V> c = new UniCompose<T,V>(e, d, this, f); |
1012 |
|
|
push(c); |
1013 |
|
|
c.tryFire(SYNC); |
1014 |
dl |
1.113 |
return d; |
1015 |
dl |
1.28 |
} |
1016 |
|
|
|
1017 |
dl |
1.113 |
/* ------------- Two-input Completions -------------- */ |
1018 |
dl |
1.104 |
|
1019 |
dl |
1.113 |
/** A Completion for an action with two sources */ |
1020 |
|
|
@SuppressWarnings("serial") |
1021 |
jsr166 |
1.124 |
abstract static class BiCompletion<T,U,V> extends UniCompletion<T,V> { |
1022 |
|
|
CompletableFuture<U> snd; // second source for action |
1023 |
|
|
BiCompletion(Executor executor, CompletableFuture<V> dep, |
1024 |
|
|
CompletableFuture<T> src, CompletableFuture<U> snd) { |
1025 |
dl |
1.113 |
super(executor, dep, src); this.snd = snd; |
1026 |
dl |
1.104 |
} |
1027 |
|
|
} |
1028 |
|
|
|
1029 |
dl |
1.113 |
/** A Completion delegating to a BiCompletion */ |
1030 |
|
|
@SuppressWarnings("serial") |
1031 |
dl |
1.110 |
static final class CoCompletion extends Completion { |
1032 |
jsr166 |
1.124 |
BiCompletion<?,?,?> base; |
1033 |
|
|
CoCompletion(BiCompletion<?,?,?> base) { this.base = base; } |
1034 |
dl |
1.113 |
final CompletableFuture<?> tryFire(int mode) { |
1035 |
jsr166 |
1.124 |
BiCompletion<?,?,?> c; CompletableFuture<?> d; |
1036 |
dl |
1.113 |
if ((c = base) == null || (d = c.tryFire(mode)) == null) |
1037 |
dl |
1.110 |
return null; |
1038 |
dl |
1.113 |
base = null; // detach |
1039 |
dl |
1.110 |
return d; |
1040 |
dl |
1.88 |
} |
1041 |
dl |
1.113 |
final boolean isLive() { |
1042 |
jsr166 |
1.124 |
BiCompletion<?,?,?> c; |
1043 |
dl |
1.113 |
return (c = base) != null && c.dep != null; |
1044 |
|
|
} |
1045 |
dl |
1.88 |
} |
1046 |
|
|
|
1047 |
dl |
1.113 |
/** Pushes completion to this and b unless both done. */ |
1048 |
jsr166 |
1.124 |
final void bipush(CompletableFuture<?> b, BiCompletion<?,?,?> c) { |
1049 |
dl |
1.113 |
if (c != null) { |
1050 |
|
|
Object r; |
1051 |
jsr166 |
1.129 |
while ((r = result) == null && !tryPushStack(c)) |
1052 |
jsr166 |
1.134 |
lazySetNext(c, null); // clear on failure |
1053 |
dl |
1.113 |
if (b != null && b != this && b.result == null) { |
1054 |
dl |
1.110 |
Completion q = (r != null) ? c : new CoCompletion(c); |
1055 |
jsr166 |
1.129 |
while (b.result == null && !b.tryPushStack(q)) |
1056 |
jsr166 |
1.134 |
lazySetNext(q, null); // clear on failure |
1057 |
dl |
1.88 |
} |
1058 |
|
|
} |
1059 |
dl |
1.104 |
} |
1060 |
|
|
|
1061 |
dl |
1.113 |
/** Post-processing after successful BiCompletion tryFire. */ |
1062 |
|
|
final CompletableFuture<T> postFire(CompletableFuture<?> a, |
1063 |
|
|
CompletableFuture<?> b, int mode) { |
1064 |
|
|
if (b != null && b.stack != null) { // clean second source |
1065 |
|
|
if (mode < 0 || b.result == null) |
1066 |
|
|
b.cleanStack(); |
1067 |
dl |
1.104 |
else |
1068 |
dl |
1.113 |
b.postComplete(); |
1069 |
dl |
1.88 |
} |
1070 |
dl |
1.113 |
return postFire(a, mode); |
1071 |
dl |
1.88 |
} |
1072 |
|
|
|
1073 |
dl |
1.113 |
@SuppressWarnings("serial") |
1074 |
jsr166 |
1.124 |
static final class BiApply<T,U,V> extends BiCompletion<T,U,V> { |
1075 |
dl |
1.113 |
BiFunction<? super T,? super U,? extends V> fn; |
1076 |
|
|
BiApply(Executor executor, CompletableFuture<V> dep, |
1077 |
jsr166 |
1.124 |
CompletableFuture<T> src, CompletableFuture<U> snd, |
1078 |
dl |
1.113 |
BiFunction<? super T,? super U,? extends V> fn) { |
1079 |
|
|
super(executor, dep, src, snd); this.fn = fn; |
1080 |
|
|
} |
1081 |
jsr166 |
1.124 |
final CompletableFuture<V> tryFire(int mode) { |
1082 |
|
|
CompletableFuture<V> d; |
1083 |
|
|
CompletableFuture<T> a; |
1084 |
|
|
CompletableFuture<U> b; |
1085 |
dl |
1.113 |
if ((d = dep) == null || |
1086 |
|
|
!d.biApply(a = src, b = snd, fn, mode > 0 ? null : this)) |
1087 |
|
|
return null; |
1088 |
jsr166 |
1.124 |
dep = null; src = null; snd = null; fn = null; |
1089 |
dl |
1.113 |
return d.postFire(a, b, mode); |
1090 |
dl |
1.104 |
} |
1091 |
|
|
} |
1092 |
|
|
|
1093 |
jsr166 |
1.124 |
final <R,S> boolean biApply(CompletableFuture<R> a, |
1094 |
|
|
CompletableFuture<S> b, |
1095 |
dl |
1.113 |
BiFunction<? super R,? super S,? extends T> f, |
1096 |
|
|
BiApply<R,S,T> c) { |
1097 |
jsr166 |
1.127 |
Object r, s; Throwable x; |
1098 |
dl |
1.113 |
if (a == null || (r = a.result) == null || |
1099 |
|
|
b == null || (s = b.result) == null || f == null) |
1100 |
|
|
return false; |
1101 |
jsr166 |
1.128 |
tryComplete: if (result == null) { |
1102 |
|
|
if (r instanceof AltResult) { |
1103 |
|
|
if ((x = ((AltResult)r).ex) != null) { |
1104 |
|
|
completeThrowable(x, r); |
1105 |
|
|
break tryComplete; |
1106 |
|
|
} |
1107 |
|
|
r = null; |
1108 |
|
|
} |
1109 |
|
|
if (s instanceof AltResult) { |
1110 |
|
|
if ((x = ((AltResult)s).ex) != null) { |
1111 |
|
|
completeThrowable(x, s); |
1112 |
|
|
break tryComplete; |
1113 |
|
|
} |
1114 |
|
|
s = null; |
1115 |
|
|
} |
1116 |
|
|
try { |
1117 |
jsr166 |
1.127 |
if (c != null && !c.claim()) |
1118 |
dl |
1.113 |
return false; |
1119 |
jsr166 |
1.127 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1120 |
|
|
@SuppressWarnings("unchecked") S ss = (S) s; |
1121 |
|
|
completeValue(f.apply(rr, ss)); |
1122 |
dl |
1.113 |
} catch (Throwable ex) { |
1123 |
jsr166 |
1.128 |
completeThrowable(ex); |
1124 |
dl |
1.88 |
} |
1125 |
|
|
} |
1126 |
dl |
1.113 |
return true; |
1127 |
dl |
1.104 |
} |
1128 |
|
|
|
1129 |
dl |
1.113 |
private <U,V> CompletableFuture<V> biApplyStage( |
1130 |
jsr166 |
1.124 |
Executor e, CompletionStage<U> o, |
1131 |
dl |
1.113 |
BiFunction<? super T,? super U,? extends V> f) { |
1132 |
jsr166 |
1.124 |
CompletableFuture<U> b; |
1133 |
dl |
1.113 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1134 |
|
|
throw new NullPointerException(); |
1135 |
dl |
1.143 |
CompletableFuture<V> d = newIncompleteFuture(); |
1136 |
dl |
1.113 |
if (e != null || !d.biApply(this, b, f, null)) { |
1137 |
|
|
BiApply<T,U,V> c = new BiApply<T,U,V>(e, d, this, b, f); |
1138 |
|
|
bipush(b, c); |
1139 |
|
|
c.tryFire(SYNC); |
1140 |
|
|
} |
1141 |
dl |
1.104 |
return d; |
1142 |
|
|
} |
1143 |
|
|
|
1144 |
dl |
1.113 |
@SuppressWarnings("serial") |
1145 |
jsr166 |
1.124 |
static final class BiAccept<T,U> extends BiCompletion<T,U,Void> { |
1146 |
dl |
1.113 |
BiConsumer<? super T,? super U> fn; |
1147 |
|
|
BiAccept(Executor executor, CompletableFuture<Void> dep, |
1148 |
jsr166 |
1.124 |
CompletableFuture<T> src, CompletableFuture<U> snd, |
1149 |
dl |
1.113 |
BiConsumer<? super T,? super U> fn) { |
1150 |
|
|
super(executor, dep, src, snd); this.fn = fn; |
1151 |
|
|
} |
1152 |
jsr166 |
1.124 |
final CompletableFuture<Void> tryFire(int mode) { |
1153 |
|
|
CompletableFuture<Void> d; |
1154 |
|
|
CompletableFuture<T> a; |
1155 |
|
|
CompletableFuture<U> b; |
1156 |
dl |
1.113 |
if ((d = dep) == null || |
1157 |
|
|
!d.biAccept(a = src, b = snd, fn, mode > 0 ? null : this)) |
1158 |
|
|
return null; |
1159 |
jsr166 |
1.124 |
dep = null; src = null; snd = null; fn = null; |
1160 |
dl |
1.113 |
return d.postFire(a, b, mode); |
1161 |
|
|
} |
1162 |
|
|
} |
1163 |
dl |
1.104 |
|
1164 |
jsr166 |
1.124 |
final <R,S> boolean biAccept(CompletableFuture<R> a, |
1165 |
|
|
CompletableFuture<S> b, |
1166 |
dl |
1.113 |
BiConsumer<? super R,? super S> f, |
1167 |
|
|
BiAccept<R,S> c) { |
1168 |
|
|
Object r, s; Throwable x; |
1169 |
|
|
if (a == null || (r = a.result) == null || |
1170 |
|
|
b == null || (s = b.result) == null || f == null) |
1171 |
|
|
return false; |
1172 |
jsr166 |
1.128 |
tryComplete: if (result == null) { |
1173 |
|
|
if (r instanceof AltResult) { |
1174 |
|
|
if ((x = ((AltResult)r).ex) != null) { |
1175 |
|
|
completeThrowable(x, r); |
1176 |
|
|
break tryComplete; |
1177 |
|
|
} |
1178 |
|
|
r = null; |
1179 |
|
|
} |
1180 |
|
|
if (s instanceof AltResult) { |
1181 |
|
|
if ((x = ((AltResult)s).ex) != null) { |
1182 |
|
|
completeThrowable(x, s); |
1183 |
|
|
break tryComplete; |
1184 |
|
|
} |
1185 |
|
|
s = null; |
1186 |
|
|
} |
1187 |
|
|
try { |
1188 |
jsr166 |
1.127 |
if (c != null && !c.claim()) |
1189 |
|
|
return false; |
1190 |
|
|
@SuppressWarnings("unchecked") R rr = (R) r; |
1191 |
|
|
@SuppressWarnings("unchecked") S ss = (S) s; |
1192 |
|
|
f.accept(rr, ss); |
1193 |
jsr166 |
1.128 |
completeNull(); |
1194 |
dl |
1.113 |
} catch (Throwable ex) { |
1195 |
jsr166 |
1.128 |
completeThrowable(ex); |
1196 |
dl |
1.88 |
} |
1197 |
dl |
1.104 |
} |
1198 |
dl |
1.113 |
return true; |
1199 |
dl |
1.104 |
} |
1200 |
|
|
|
1201 |
dl |
1.113 |
private <U> CompletableFuture<Void> biAcceptStage( |
1202 |
jsr166 |
1.124 |
Executor e, CompletionStage<U> o, |
1203 |
dl |
1.113 |
BiConsumer<? super T,? super U> f) { |
1204 |
jsr166 |
1.124 |
CompletableFuture<U> b; |
1205 |
dl |
1.113 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1206 |
|
|
throw new NullPointerException(); |
1207 |
dl |
1.143 |
CompletableFuture<Void> d = newIncompleteFuture(); |
1208 |
dl |
1.113 |
if (e != null || !d.biAccept(this, b, f, null)) { |
1209 |
|
|
BiAccept<T,U> c = new BiAccept<T,U>(e, d, this, b, f); |
1210 |
|
|
bipush(b, c); |
1211 |
|
|
c.tryFire(SYNC); |
1212 |
dl |
1.104 |
} |
1213 |
dl |
1.113 |
return d; |
1214 |
dl |
1.104 |
} |
1215 |
|
|
|
1216 |
dl |
1.113 |
@SuppressWarnings("serial") |
1217 |
jsr166 |
1.124 |
static final class BiRun<T,U> extends BiCompletion<T,U,Void> { |
1218 |
dl |
1.113 |
Runnable fn; |
1219 |
|
|
BiRun(Executor executor, CompletableFuture<Void> dep, |
1220 |
jsr166 |
1.124 |
CompletableFuture<T> src, |
1221 |
|
|
CompletableFuture<U> snd, |
1222 |
dl |
1.113 |
Runnable fn) { |
1223 |
|
|
super(executor, dep, src, snd); this.fn = fn; |
1224 |
|
|
} |
1225 |
jsr166 |
1.124 |
final CompletableFuture<Void> tryFire(int mode) { |
1226 |
|
|
CompletableFuture<Void> d; |
1227 |
|
|
CompletableFuture<T> a; |
1228 |
|
|
CompletableFuture<U> b; |
1229 |
dl |
1.113 |
if ((d = dep) == null || |
1230 |
|
|
!d.biRun(a = src, b = snd, fn, mode > 0 ? null : this)) |
1231 |
|
|
return null; |
1232 |
jsr166 |
1.124 |
dep = null; src = null; snd = null; fn = null; |
1233 |
dl |
1.113 |
return d.postFire(a, b, mode); |
1234 |
dl |
1.88 |
} |
1235 |
|
|
} |
1236 |
|
|
|
1237 |
dl |
1.113 |
final boolean biRun(CompletableFuture<?> a, CompletableFuture<?> b, |
1238 |
jsr166 |
1.124 |
Runnable f, BiRun<?,?> c) { |
1239 |
dl |
1.113 |
Object r, s; Throwable x; |
1240 |
|
|
if (a == null || (r = a.result) == null || |
1241 |
|
|
b == null || (s = b.result) == null || f == null) |
1242 |
|
|
return false; |
1243 |
|
|
if (result == null) { |
1244 |
jsr166 |
1.128 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) |
1245 |
|
|
completeThrowable(x, r); |
1246 |
|
|
else if (s instanceof AltResult && (x = ((AltResult)s).ex) != null) |
1247 |
|
|
completeThrowable(x, s); |
1248 |
|
|
else |
1249 |
|
|
try { |
1250 |
|
|
if (c != null && !c.claim()) |
1251 |
|
|
return false; |
1252 |
|
|
f.run(); |
1253 |
|
|
completeNull(); |
1254 |
|
|
} catch (Throwable ex) { |
1255 |
|
|
completeThrowable(ex); |
1256 |
|
|
} |
1257 |
dl |
1.88 |
} |
1258 |
dl |
1.113 |
return true; |
1259 |
dl |
1.104 |
} |
1260 |
|
|
|
1261 |
dl |
1.113 |
private CompletableFuture<Void> biRunStage(Executor e, CompletionStage<?> o, |
1262 |
|
|
Runnable f) { |
1263 |
|
|
CompletableFuture<?> b; |
1264 |
|
|
if (f == null || (b = o.toCompletableFuture()) == null) |
1265 |
|
|
throw new NullPointerException(); |
1266 |
dl |
1.143 |
CompletableFuture<Void> d = newIncompleteFuture(); |
1267 |
dl |
1.113 |
if (e != null || !d.biRun(this, b, f, null)) { |
1268 |
jsr166 |
1.124 |
BiRun<T,?> c = new BiRun<>(e, d, this, b, f); |
1269 |
dl |
1.113 |
bipush(b, c); |
1270 |
|
|
c.tryFire(SYNC); |
1271 |
dl |
1.104 |
} |
1272 |
|
|
return d; |
1273 |
|
|
} |
1274 |
|
|
|
1275 |
dl |
1.113 |
@SuppressWarnings("serial") |
1276 |
jsr166 |
1.124 |
static final class BiRelay<T,U> extends BiCompletion<T,U,Void> { // for And |
1277 |
|
|
BiRelay(CompletableFuture<Void> dep, |
1278 |
|
|
CompletableFuture<T> src, |
1279 |
|
|
CompletableFuture<U> snd) { |
1280 |
dl |
1.113 |
super(null, dep, src, snd); |
1281 |
|
|
} |
1282 |
jsr166 |
1.124 |
final CompletableFuture<Void> tryFire(int mode) { |
1283 |
|
|
CompletableFuture<Void> d; |
1284 |
|
|
CompletableFuture<T> a; |
1285 |
|
|
CompletableFuture<U> b; |
1286 |
dl |
1.113 |
if ((d = dep) == null || !d.biRelay(a = src, b = snd)) |
1287 |
|
|
return null; |
1288 |
jsr166 |
1.124 |
src = null; snd = null; dep = null; |
1289 |
dl |
1.113 |
return d.postFire(a, b, mode); |
1290 |
|
|
} |
1291 |
|
|
} |
1292 |
dl |
1.104 |
|
1293 |
jsr166 |
1.126 |
boolean biRelay(CompletableFuture<?> a, CompletableFuture<?> b) { |
1294 |
dl |
1.113 |
Object r, s; Throwable x; |
1295 |
|
|
if (a == null || (r = a.result) == null || |
1296 |
|
|
b == null || (s = b.result) == null) |
1297 |
|
|
return false; |
1298 |
|
|
if (result == null) { |
1299 |
jsr166 |
1.128 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) |
1300 |
|
|
completeThrowable(x, r); |
1301 |
|
|
else if (s instanceof AltResult && (x = ((AltResult)s).ex) != null) |
1302 |
|
|
completeThrowable(x, s); |
1303 |
dl |
1.113 |
else |
1304 |
jsr166 |
1.128 |
completeNull(); |
1305 |
dl |
1.88 |
} |
1306 |
dl |
1.113 |
return true; |
1307 |
dl |
1.104 |
} |
1308 |
|
|
|
1309 |
jsr166 |
1.117 |
/** Recursively constructs a tree of completions. */ |
1310 |
dl |
1.113 |
static CompletableFuture<Void> andTree(CompletableFuture<?>[] cfs, |
1311 |
|
|
int lo, int hi) { |
1312 |
dl |
1.104 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1313 |
|
|
if (lo > hi) // empty |
1314 |
|
|
d.result = NIL; |
1315 |
dl |
1.101 |
else { |
1316 |
dl |
1.113 |
CompletableFuture<?> a, b; |
1317 |
dl |
1.104 |
int mid = (lo + hi) >>> 1; |
1318 |
dl |
1.113 |
if ((a = (lo == mid ? cfs[lo] : |
1319 |
jsr166 |
1.122 |
andTree(cfs, lo, mid))) == null || |
1320 |
dl |
1.113 |
(b = (lo == hi ? a : (hi == mid+1) ? cfs[hi] : |
1321 |
|
|
andTree(cfs, mid+1, hi))) == null) |
1322 |
|
|
throw new NullPointerException(); |
1323 |
|
|
if (!d.biRelay(a, b)) { |
1324 |
jsr166 |
1.124 |
BiRelay<?,?> c = new BiRelay<>(d, a, b); |
1325 |
dl |
1.113 |
a.bipush(b, c); |
1326 |
|
|
c.tryFire(SYNC); |
1327 |
dl |
1.88 |
} |
1328 |
|
|
} |
1329 |
dl |
1.104 |
return d; |
1330 |
dl |
1.88 |
} |
1331 |
|
|
|
1332 |
dl |
1.113 |
/* ------------- Projected (Ored) BiCompletions -------------- */ |
1333 |
dl |
1.104 |
|
1334 |
dl |
1.113 |
/** Pushes completion to this and b unless either done. */ |
1335 |
jsr166 |
1.124 |
final void orpush(CompletableFuture<?> b, BiCompletion<?,?,?> c) { |
1336 |
dl |
1.113 |
if (c != null) { |
1337 |
|
|
while ((b == null || b.result == null) && result == null) { |
1338 |
jsr166 |
1.129 |
if (tryPushStack(c)) { |
1339 |
dl |
1.113 |
if (b != null && b != this && b.result == null) { |
1340 |
|
|
Completion q = new CoCompletion(c); |
1341 |
|
|
while (result == null && b.result == null && |
1342 |
jsr166 |
1.129 |
!b.tryPushStack(q)) |
1343 |
jsr166 |
1.134 |
lazySetNext(q, null); // clear on failure |
1344 |
dl |
1.113 |
} |
1345 |
dl |
1.104 |
break; |
1346 |
dl |
1.88 |
} |
1347 |
jsr166 |
1.134 |
lazySetNext(c, null); // clear on failure |
1348 |
dl |
1.88 |
} |
1349 |
|
|
} |
1350 |
dl |
1.104 |
} |
1351 |
|
|
|
1352 |
dl |
1.113 |
@SuppressWarnings("serial") |
1353 |
jsr166 |
1.124 |
static final class OrApply<T,U extends T,V> extends BiCompletion<T,U,V> { |
1354 |
|
|
Function<? super T,? extends V> fn; |
1355 |
|
|
OrApply(Executor executor, CompletableFuture<V> dep, |
1356 |
|
|
CompletableFuture<T> src, |
1357 |
|
|
CompletableFuture<U> snd, |
1358 |
|
|
Function<? super T,? extends V> fn) { |
1359 |
dl |
1.113 |
super(executor, dep, src, snd); this.fn = fn; |
1360 |
|
|
} |
1361 |
jsr166 |
1.124 |
final CompletableFuture<V> tryFire(int mode) { |
1362 |
|
|
CompletableFuture<V> d; |
1363 |
|
|
CompletableFuture<T> a; |
1364 |
|
|
CompletableFuture<U> b; |
1365 |
dl |
1.113 |
if ((d = dep) == null || |
1366 |
|
|
!d.orApply(a = src, b = snd, fn, mode > 0 ? null : this)) |
1367 |
|
|
return null; |
1368 |
jsr166 |
1.124 |
dep = null; src = null; snd = null; fn = null; |
1369 |
dl |
1.113 |
return d.postFire(a, b, mode); |
1370 |
|
|
} |
1371 |
|
|
} |
1372 |
dl |
1.104 |
|
1373 |
jsr166 |
1.124 |
final <R,S extends R> boolean orApply(CompletableFuture<R> a, |
1374 |
|
|
CompletableFuture<S> b, |
1375 |
|
|
Function<? super R, ? extends T> f, |
1376 |
|
|
OrApply<R,S,T> c) { |
1377 |
jsr166 |
1.127 |
Object r; Throwable x; |
1378 |
dl |
1.113 |
if (a == null || b == null || |
1379 |
|
|
((r = a.result) == null && (r = b.result) == null) || f == null) |
1380 |
|
|
return false; |
1381 |
jsr166 |
1.128 |
tryComplete: if (result == null) { |
1382 |
|
|
try { |
1383 |
jsr166 |
1.127 |
if (c != null && !c.claim()) |
1384 |
dl |
1.113 |
return false; |
1385 |
jsr166 |
1.128 |
if (r instanceof AltResult) { |
1386 |
|
|
if ((x = ((AltResult)r).ex) != null) { |
1387 |
|
|
completeThrowable(x, r); |
1388 |
|
|
break tryComplete; |
1389 |
|
|
} |
1390 |
|
|
r = null; |
1391 |
|
|
} |
1392 |
jsr166 |
1.127 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1393 |
|
|
completeValue(f.apply(rr)); |
1394 |
dl |
1.113 |
} catch (Throwable ex) { |
1395 |
jsr166 |
1.128 |
completeThrowable(ex); |
1396 |
dl |
1.88 |
} |
1397 |
|
|
} |
1398 |
dl |
1.113 |
return true; |
1399 |
dl |
1.88 |
} |
1400 |
|
|
|
1401 |
jsr166 |
1.124 |
private <U extends T,V> CompletableFuture<V> orApplyStage( |
1402 |
|
|
Executor e, CompletionStage<U> o, |
1403 |
|
|
Function<? super T, ? extends V> f) { |
1404 |
|
|
CompletableFuture<U> b; |
1405 |
dl |
1.113 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1406 |
|
|
throw new NullPointerException(); |
1407 |
dl |
1.143 |
CompletableFuture<V> d = newIncompleteFuture(); |
1408 |
dl |
1.113 |
if (e != null || !d.orApply(this, b, f, null)) { |
1409 |
jsr166 |
1.124 |
OrApply<T,U,V> c = new OrApply<T,U,V>(e, d, this, b, f); |
1410 |
dl |
1.113 |
orpush(b, c); |
1411 |
|
|
c.tryFire(SYNC); |
1412 |
|
|
} |
1413 |
|
|
return d; |
1414 |
|
|
} |
1415 |
|
|
|
1416 |
|
|
@SuppressWarnings("serial") |
1417 |
jsr166 |
1.124 |
static final class OrAccept<T,U extends T> extends BiCompletion<T,U,Void> { |
1418 |
dl |
1.113 |
Consumer<? super T> fn; |
1419 |
|
|
OrAccept(Executor executor, CompletableFuture<Void> dep, |
1420 |
jsr166 |
1.124 |
CompletableFuture<T> src, |
1421 |
|
|
CompletableFuture<U> snd, |
1422 |
dl |
1.113 |
Consumer<? super T> fn) { |
1423 |
|
|
super(executor, dep, src, snd); this.fn = fn; |
1424 |
|
|
} |
1425 |
jsr166 |
1.124 |
final CompletableFuture<Void> tryFire(int mode) { |
1426 |
|
|
CompletableFuture<Void> d; |
1427 |
|
|
CompletableFuture<T> a; |
1428 |
|
|
CompletableFuture<U> b; |
1429 |
dl |
1.113 |
if ((d = dep) == null || |
1430 |
|
|
!d.orAccept(a = src, b = snd, fn, mode > 0 ? null : this)) |
1431 |
|
|
return null; |
1432 |
jsr166 |
1.124 |
dep = null; src = null; snd = null; fn = null; |
1433 |
dl |
1.113 |
return d.postFire(a, b, mode); |
1434 |
|
|
} |
1435 |
|
|
} |
1436 |
|
|
|
1437 |
jsr166 |
1.124 |
final <R,S extends R> boolean orAccept(CompletableFuture<R> a, |
1438 |
|
|
CompletableFuture<S> b, |
1439 |
|
|
Consumer<? super R> f, |
1440 |
|
|
OrAccept<R,S> c) { |
1441 |
dl |
1.113 |
Object r; Throwable x; |
1442 |
|
|
if (a == null || b == null || |
1443 |
|
|
((r = a.result) == null && (r = b.result) == null) || f == null) |
1444 |
|
|
return false; |
1445 |
jsr166 |
1.128 |
tryComplete: if (result == null) { |
1446 |
|
|
try { |
1447 |
jsr166 |
1.127 |
if (c != null && !c.claim()) |
1448 |
|
|
return false; |
1449 |
jsr166 |
1.128 |
if (r instanceof AltResult) { |
1450 |
|
|
if ((x = ((AltResult)r).ex) != null) { |
1451 |
|
|
completeThrowable(x, r); |
1452 |
|
|
break tryComplete; |
1453 |
|
|
} |
1454 |
|
|
r = null; |
1455 |
|
|
} |
1456 |
jsr166 |
1.127 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1457 |
|
|
f.accept(rr); |
1458 |
jsr166 |
1.128 |
completeNull(); |
1459 |
dl |
1.113 |
} catch (Throwable ex) { |
1460 |
jsr166 |
1.128 |
completeThrowable(ex); |
1461 |
dl |
1.113 |
} |
1462 |
|
|
} |
1463 |
|
|
return true; |
1464 |
|
|
} |
1465 |
|
|
|
1466 |
jsr166 |
1.124 |
private <U extends T> CompletableFuture<Void> orAcceptStage( |
1467 |
|
|
Executor e, CompletionStage<U> o, Consumer<? super T> f) { |
1468 |
|
|
CompletableFuture<U> b; |
1469 |
dl |
1.113 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1470 |
|
|
throw new NullPointerException(); |
1471 |
dl |
1.143 |
CompletableFuture<Void> d = newIncompleteFuture(); |
1472 |
dl |
1.113 |
if (e != null || !d.orAccept(this, b, f, null)) { |
1473 |
jsr166 |
1.124 |
OrAccept<T,U> c = new OrAccept<T,U>(e, d, this, b, f); |
1474 |
dl |
1.113 |
orpush(b, c); |
1475 |
|
|
c.tryFire(SYNC); |
1476 |
|
|
} |
1477 |
dl |
1.104 |
return d; |
1478 |
|
|
} |
1479 |
|
|
|
1480 |
dl |
1.113 |
@SuppressWarnings("serial") |
1481 |
jsr166 |
1.124 |
static final class OrRun<T,U> extends BiCompletion<T,U,Void> { |
1482 |
dl |
1.113 |
Runnable fn; |
1483 |
|
|
OrRun(Executor executor, CompletableFuture<Void> dep, |
1484 |
jsr166 |
1.124 |
CompletableFuture<T> src, |
1485 |
|
|
CompletableFuture<U> snd, |
1486 |
|
|
Runnable fn) { |
1487 |
dl |
1.113 |
super(executor, dep, src, snd); this.fn = fn; |
1488 |
|
|
} |
1489 |
jsr166 |
1.124 |
final CompletableFuture<Void> tryFire(int mode) { |
1490 |
|
|
CompletableFuture<Void> d; |
1491 |
|
|
CompletableFuture<T> a; |
1492 |
|
|
CompletableFuture<U> b; |
1493 |
dl |
1.113 |
if ((d = dep) == null || |
1494 |
|
|
!d.orRun(a = src, b = snd, fn, mode > 0 ? null : this)) |
1495 |
|
|
return null; |
1496 |
jsr166 |
1.124 |
dep = null; src = null; snd = null; fn = null; |
1497 |
dl |
1.113 |
return d.postFire(a, b, mode); |
1498 |
|
|
} |
1499 |
|
|
} |
1500 |
dl |
1.104 |
|
1501 |
dl |
1.113 |
final boolean orRun(CompletableFuture<?> a, CompletableFuture<?> b, |
1502 |
jsr166 |
1.124 |
Runnable f, OrRun<?,?> c) { |
1503 |
dl |
1.113 |
Object r; Throwable x; |
1504 |
|
|
if (a == null || b == null || |
1505 |
|
|
((r = a.result) == null && (r = b.result) == null) || f == null) |
1506 |
|
|
return false; |
1507 |
|
|
if (result == null) { |
1508 |
jsr166 |
1.128 |
try { |
1509 |
jsr166 |
1.127 |
if (c != null && !c.claim()) |
1510 |
|
|
return false; |
1511 |
|
|
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) |
1512 |
jsr166 |
1.128 |
completeThrowable(x, r); |
1513 |
|
|
else { |
1514 |
|
|
f.run(); |
1515 |
|
|
completeNull(); |
1516 |
|
|
} |
1517 |
dl |
1.113 |
} catch (Throwable ex) { |
1518 |
jsr166 |
1.128 |
completeThrowable(ex); |
1519 |
dl |
1.88 |
} |
1520 |
|
|
} |
1521 |
dl |
1.113 |
return true; |
1522 |
dl |
1.104 |
} |
1523 |
|
|
|
1524 |
dl |
1.113 |
private CompletableFuture<Void> orRunStage(Executor e, CompletionStage<?> o, |
1525 |
|
|
Runnable f) { |
1526 |
|
|
CompletableFuture<?> b; |
1527 |
|
|
if (f == null || (b = o.toCompletableFuture()) == null) |
1528 |
|
|
throw new NullPointerException(); |
1529 |
dl |
1.143 |
CompletableFuture<Void> d = newIncompleteFuture(); |
1530 |
dl |
1.113 |
if (e != null || !d.orRun(this, b, f, null)) { |
1531 |
jsr166 |
1.124 |
OrRun<T,?> c = new OrRun<>(e, d, this, b, f); |
1532 |
dl |
1.113 |
orpush(b, c); |
1533 |
|
|
c.tryFire(SYNC); |
1534 |
|
|
} |
1535 |
|
|
return d; |
1536 |
|
|
} |
1537 |
|
|
|
1538 |
|
|
@SuppressWarnings("serial") |
1539 |
jsr166 |
1.124 |
static final class OrRelay<T,U> extends BiCompletion<T,U,Object> { // for Or |
1540 |
|
|
OrRelay(CompletableFuture<Object> dep, CompletableFuture<T> src, |
1541 |
|
|
CompletableFuture<U> snd) { |
1542 |
dl |
1.113 |
super(null, dep, src, snd); |
1543 |
|
|
} |
1544 |
jsr166 |
1.124 |
final CompletableFuture<Object> tryFire(int mode) { |
1545 |
|
|
CompletableFuture<Object> d; |
1546 |
|
|
CompletableFuture<T> a; |
1547 |
|
|
CompletableFuture<U> b; |
1548 |
dl |
1.113 |
if ((d = dep) == null || !d.orRelay(a = src, b = snd)) |
1549 |
|
|
return null; |
1550 |
jsr166 |
1.124 |
src = null; snd = null; dep = null; |
1551 |
dl |
1.113 |
return d.postFire(a, b, mode); |
1552 |
|
|
} |
1553 |
|
|
} |
1554 |
|
|
|
1555 |
|
|
final boolean orRelay(CompletableFuture<?> a, CompletableFuture<?> b) { |
1556 |
|
|
Object r; |
1557 |
|
|
if (a == null || b == null || |
1558 |
|
|
((r = a.result) == null && (r = b.result) == null)) |
1559 |
|
|
return false; |
1560 |
|
|
if (result == null) |
1561 |
jsr166 |
1.127 |
completeRelay(r); |
1562 |
dl |
1.113 |
return true; |
1563 |
|
|
} |
1564 |
|
|
|
1565 |
dl |
1.143 |
|
1566 |
jsr166 |
1.118 |
/** Recursively constructs a tree of completions. */ |
1567 |
dl |
1.113 |
static CompletableFuture<Object> orTree(CompletableFuture<?>[] cfs, |
1568 |
|
|
int lo, int hi) { |
1569 |
|
|
CompletableFuture<Object> d = new CompletableFuture<Object>(); |
1570 |
|
|
if (lo <= hi) { |
1571 |
|
|
CompletableFuture<?> a, b; |
1572 |
|
|
int mid = (lo + hi) >>> 1; |
1573 |
|
|
if ((a = (lo == mid ? cfs[lo] : |
1574 |
jsr166 |
1.122 |
orTree(cfs, lo, mid))) == null || |
1575 |
dl |
1.113 |
(b = (lo == hi ? a : (hi == mid+1) ? cfs[hi] : |
1576 |
|
|
orTree(cfs, mid+1, hi))) == null) |
1577 |
|
|
throw new NullPointerException(); |
1578 |
|
|
if (!d.orRelay(a, b)) { |
1579 |
jsr166 |
1.124 |
OrRelay<?,?> c = new OrRelay<>(d, a, b); |
1580 |
dl |
1.113 |
a.orpush(b, c); |
1581 |
|
|
c.tryFire(SYNC); |
1582 |
|
|
} |
1583 |
|
|
} |
1584 |
dl |
1.104 |
return d; |
1585 |
|
|
} |
1586 |
|
|
|
1587 |
dl |
1.113 |
/* ------------- Zero-input Async forms -------------- */ |
1588 |
dl |
1.104 |
|
1589 |
jsr166 |
1.133 |
@SuppressWarnings("serial") |
1590 |
|
|
static final class AsyncSupply<T> extends ForkJoinTask<Void> |
1591 |
dl |
1.143 |
implements Runnable, AsynchronousCompletionTask { |
1592 |
dl |
1.113 |
CompletableFuture<T> dep; Supplier<T> fn; |
1593 |
|
|
AsyncSupply(CompletableFuture<T> dep, Supplier<T> fn) { |
1594 |
|
|
this.dep = dep; this.fn = fn; |
1595 |
|
|
} |
1596 |
|
|
|
1597 |
jsr166 |
1.133 |
public final Void getRawResult() { return null; } |
1598 |
|
|
public final void setRawResult(Void v) {} |
1599 |
|
|
public final boolean exec() { run(); return true; } |
1600 |
|
|
|
1601 |
jsr166 |
1.131 |
public void run() { |
1602 |
dl |
1.113 |
CompletableFuture<T> d; Supplier<T> f; |
1603 |
|
|
if ((d = dep) != null && (f = fn) != null) { |
1604 |
|
|
dep = null; fn = null; |
1605 |
|
|
if (d.result == null) { |
1606 |
|
|
try { |
1607 |
jsr166 |
1.127 |
d.completeValue(f.get()); |
1608 |
dl |
1.113 |
} catch (Throwable ex) { |
1609 |
jsr166 |
1.127 |
d.completeThrowable(ex); |
1610 |
dl |
1.113 |
} |
1611 |
|
|
} |
1612 |
|
|
d.postComplete(); |
1613 |
|
|
} |
1614 |
|
|
} |
1615 |
|
|
} |
1616 |
|
|
|
1617 |
|
|
static <U> CompletableFuture<U> asyncSupplyStage(Executor e, |
1618 |
|
|
Supplier<U> f) { |
1619 |
|
|
if (f == null) throw new NullPointerException(); |
1620 |
|
|
CompletableFuture<U> d = new CompletableFuture<U>(); |
1621 |
|
|
e.execute(new AsyncSupply<U>(d, f)); |
1622 |
|
|
return d; |
1623 |
|
|
} |
1624 |
|
|
|
1625 |
jsr166 |
1.133 |
@SuppressWarnings("serial") |
1626 |
|
|
static final class AsyncRun extends ForkJoinTask<Void> |
1627 |
dl |
1.143 |
implements Runnable, AsynchronousCompletionTask { |
1628 |
dl |
1.113 |
CompletableFuture<Void> dep; Runnable fn; |
1629 |
|
|
AsyncRun(CompletableFuture<Void> dep, Runnable fn) { |
1630 |
|
|
this.dep = dep; this.fn = fn; |
1631 |
|
|
} |
1632 |
|
|
|
1633 |
jsr166 |
1.133 |
public final Void getRawResult() { return null; } |
1634 |
|
|
public final void setRawResult(Void v) {} |
1635 |
|
|
public final boolean exec() { run(); return true; } |
1636 |
|
|
|
1637 |
jsr166 |
1.131 |
public void run() { |
1638 |
dl |
1.113 |
CompletableFuture<Void> d; Runnable f; |
1639 |
|
|
if ((d = dep) != null && (f = fn) != null) { |
1640 |
|
|
dep = null; fn = null; |
1641 |
|
|
if (d.result == null) { |
1642 |
|
|
try { |
1643 |
|
|
f.run(); |
1644 |
jsr166 |
1.128 |
d.completeNull(); |
1645 |
dl |
1.113 |
} catch (Throwable ex) { |
1646 |
jsr166 |
1.127 |
d.completeThrowable(ex); |
1647 |
dl |
1.113 |
} |
1648 |
|
|
} |
1649 |
|
|
d.postComplete(); |
1650 |
dl |
1.88 |
} |
1651 |
|
|
} |
1652 |
|
|
} |
1653 |
|
|
|
1654 |
dl |
1.113 |
static CompletableFuture<Void> asyncRunStage(Executor e, Runnable f) { |
1655 |
|
|
if (f == null) throw new NullPointerException(); |
1656 |
dl |
1.104 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1657 |
dl |
1.113 |
e.execute(new AsyncRun(d, f)); |
1658 |
dl |
1.104 |
return d; |
1659 |
|
|
} |
1660 |
|
|
|
1661 |
|
|
/* ------------- Signallers -------------- */ |
1662 |
|
|
|
1663 |
|
|
/** |
1664 |
dl |
1.113 |
* Completion for recording and releasing a waiting thread. This |
1665 |
|
|
* class implements ManagedBlocker to avoid starvation when |
1666 |
|
|
* blocking actions pile up in ForkJoinPools. |
1667 |
dl |
1.104 |
*/ |
1668 |
dl |
1.113 |
@SuppressWarnings("serial") |
1669 |
dl |
1.110 |
static final class Signaller extends Completion |
1670 |
dl |
1.104 |
implements ForkJoinPool.ManagedBlocker { |
1671 |
dl |
1.113 |
long nanos; // wait time if timed |
1672 |
|
|
final long deadline; // non-zero if timed |
1673 |
dl |
1.104 |
volatile int interruptControl; // > 0: interruptible, < 0: interrupted |
1674 |
|
|
volatile Thread thread; |
1675 |
dl |
1.113 |
|
1676 |
dl |
1.104 |
Signaller(boolean interruptible, long nanos, long deadline) { |
1677 |
|
|
this.thread = Thread.currentThread(); |
1678 |
|
|
this.interruptControl = interruptible ? 1 : 0; |
1679 |
|
|
this.nanos = nanos; |
1680 |
|
|
this.deadline = deadline; |
1681 |
|
|
} |
1682 |
dl |
1.113 |
final CompletableFuture<?> tryFire(int ignore) { |
1683 |
|
|
Thread w; // no need to atomically claim |
1684 |
|
|
if ((w = thread) != null) { |
1685 |
|
|
thread = null; |
1686 |
dl |
1.104 |
LockSupport.unpark(w); |
1687 |
dl |
1.88 |
} |
1688 |
dl |
1.104 |
return null; |
1689 |
dl |
1.88 |
} |
1690 |
dl |
1.104 |
public boolean isReleasable() { |
1691 |
|
|
if (thread == null) |
1692 |
|
|
return true; |
1693 |
|
|
if (Thread.interrupted()) { |
1694 |
|
|
int i = interruptControl; |
1695 |
|
|
interruptControl = -1; |
1696 |
|
|
if (i > 0) |
1697 |
|
|
return true; |
1698 |
dl |
1.88 |
} |
1699 |
dl |
1.104 |
if (deadline != 0L && |
1700 |
|
|
(nanos <= 0L || (nanos = deadline - System.nanoTime()) <= 0L)) { |
1701 |
|
|
thread = null; |
1702 |
|
|
return true; |
1703 |
dl |
1.88 |
} |
1704 |
dl |
1.104 |
return false; |
1705 |
|
|
} |
1706 |
|
|
public boolean block() { |
1707 |
|
|
if (isReleasable()) |
1708 |
|
|
return true; |
1709 |
|
|
else if (deadline == 0L) |
1710 |
|
|
LockSupport.park(this); |
1711 |
|
|
else if (nanos > 0L) |
1712 |
|
|
LockSupport.parkNanos(this, nanos); |
1713 |
|
|
return isReleasable(); |
1714 |
dl |
1.88 |
} |
1715 |
dl |
1.113 |
final boolean isLive() { return thread != null; } |
1716 |
dl |
1.88 |
} |
1717 |
|
|
|
1718 |
dl |
1.104 |
/** |
1719 |
|
|
* Returns raw result after waiting, or null if interruptible and |
1720 |
|
|
* interrupted. |
1721 |
|
|
*/ |
1722 |
|
|
private Object waitingGet(boolean interruptible) { |
1723 |
|
|
Signaller q = null; |
1724 |
|
|
boolean queued = false; |
1725 |
dl |
1.113 |
int spins = -1; |
1726 |
dl |
1.88 |
Object r; |
1727 |
dl |
1.104 |
while ((r = result) == null) { |
1728 |
dl |
1.113 |
if (spins < 0) |
1729 |
|
|
spins = (Runtime.getRuntime().availableProcessors() > 1) ? |
1730 |
|
|
1 << 8 : 0; // Use brief spin-wait on multiprocessors |
1731 |
|
|
else if (spins > 0) { |
1732 |
dl |
1.104 |
if (ThreadLocalRandom.nextSecondarySeed() >= 0) |
1733 |
|
|
--spins; |
1734 |
dl |
1.88 |
} |
1735 |
dl |
1.104 |
else if (q == null) |
1736 |
|
|
q = new Signaller(interruptible, 0L, 0L); |
1737 |
|
|
else if (!queued) |
1738 |
jsr166 |
1.129 |
queued = tryPushStack(q); |
1739 |
dl |
1.104 |
else if (interruptible && q.interruptControl < 0) { |
1740 |
|
|
q.thread = null; |
1741 |
dl |
1.113 |
cleanStack(); |
1742 |
dl |
1.104 |
return null; |
1743 |
dl |
1.88 |
} |
1744 |
dl |
1.104 |
else if (q.thread != null && result == null) { |
1745 |
|
|
try { |
1746 |
|
|
ForkJoinPool.managedBlock(q); |
1747 |
|
|
} catch (InterruptedException ie) { |
1748 |
|
|
q.interruptControl = -1; |
1749 |
|
|
} |
1750 |
dl |
1.88 |
} |
1751 |
dl |
1.104 |
} |
1752 |
|
|
if (q != null) { |
1753 |
|
|
q.thread = null; |
1754 |
|
|
if (q.interruptControl < 0) { |
1755 |
|
|
if (interruptible) |
1756 |
|
|
r = null; // report interruption |
1757 |
dl |
1.88 |
else |
1758 |
dl |
1.104 |
Thread.currentThread().interrupt(); |
1759 |
dl |
1.88 |
} |
1760 |
|
|
} |
1761 |
dl |
1.104 |
postComplete(); |
1762 |
|
|
return r; |
1763 |
dl |
1.88 |
} |
1764 |
|
|
|
1765 |
dl |
1.104 |
/** |
1766 |
|
|
* Returns raw result after waiting, or null if interrupted, or |
1767 |
|
|
* throws TimeoutException on timeout. |
1768 |
|
|
*/ |
1769 |
|
|
private Object timedGet(long nanos) throws TimeoutException { |
1770 |
|
|
if (Thread.interrupted()) |
1771 |
|
|
return null; |
1772 |
|
|
if (nanos <= 0L) |
1773 |
|
|
throw new TimeoutException(); |
1774 |
|
|
long d = System.nanoTime() + nanos; |
1775 |
|
|
Signaller q = new Signaller(true, nanos, d == 0L ? 1L : d); // avoid 0 |
1776 |
|
|
boolean queued = false; |
1777 |
dl |
1.88 |
Object r; |
1778 |
jsr166 |
1.132 |
// We intentionally don't spin here (as waitingGet does) because |
1779 |
|
|
// the call to nanoTime() above acts much like a spin. |
1780 |
dl |
1.104 |
while ((r = result) == null) { |
1781 |
|
|
if (!queued) |
1782 |
jsr166 |
1.129 |
queued = tryPushStack(q); |
1783 |
dl |
1.104 |
else if (q.interruptControl < 0 || q.nanos <= 0L) { |
1784 |
|
|
q.thread = null; |
1785 |
dl |
1.113 |
cleanStack(); |
1786 |
dl |
1.104 |
if (q.interruptControl < 0) |
1787 |
|
|
return null; |
1788 |
|
|
throw new TimeoutException(); |
1789 |
|
|
} |
1790 |
|
|
else if (q.thread != null && result == null) { |
1791 |
|
|
try { |
1792 |
|
|
ForkJoinPool.managedBlock(q); |
1793 |
|
|
} catch (InterruptedException ie) { |
1794 |
|
|
q.interruptControl = -1; |
1795 |
|
|
} |
1796 |
dl |
1.88 |
} |
1797 |
|
|
} |
1798 |
dl |
1.113 |
if (q.interruptControl < 0) |
1799 |
|
|
r = null; |
1800 |
dl |
1.104 |
q.thread = null; |
1801 |
|
|
postComplete(); |
1802 |
dl |
1.113 |
return r; |
1803 |
dl |
1.88 |
} |
1804 |
|
|
|
1805 |
dl |
1.104 |
/* ------------- public methods -------------- */ |
1806 |
dl |
1.88 |
|
1807 |
|
|
/** |
1808 |
|
|
* Creates a new incomplete CompletableFuture. |
1809 |
|
|
*/ |
1810 |
|
|
public CompletableFuture() { |
1811 |
|
|
} |
1812 |
|
|
|
1813 |
|
|
/** |
1814 |
jsr166 |
1.128 |
* Creates a new complete CompletableFuture with given encoded result. |
1815 |
|
|
*/ |
1816 |
dl |
1.143 |
CompletableFuture(Object r) { |
1817 |
jsr166 |
1.128 |
this.result = r; |
1818 |
|
|
} |
1819 |
|
|
|
1820 |
|
|
/** |
1821 |
dl |
1.88 |
* Returns a new CompletableFuture that is asynchronously completed |
1822 |
|
|
* by a task running in the {@link ForkJoinPool#commonPool()} with |
1823 |
|
|
* the value obtained by calling the given Supplier. |
1824 |
|
|
* |
1825 |
|
|
* @param supplier a function returning the value to be used |
1826 |
|
|
* to complete the returned CompletableFuture |
1827 |
jsr166 |
1.95 |
* @param <U> the function's return type |
1828 |
dl |
1.88 |
* @return the new CompletableFuture |
1829 |
|
|
*/ |
1830 |
|
|
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier) { |
1831 |
dl |
1.113 |
return asyncSupplyStage(asyncPool, supplier); |
1832 |
dl |
1.88 |
} |
1833 |
|
|
|
1834 |
|
|
/** |
1835 |
|
|
* Returns a new CompletableFuture that is asynchronously completed |
1836 |
|
|
* by a task running in the given executor with the value obtained |
1837 |
|
|
* by calling the given Supplier. |
1838 |
|
|
* |
1839 |
|
|
* @param supplier a function returning the value to be used |
1840 |
|
|
* to complete the returned CompletableFuture |
1841 |
|
|
* @param executor the executor to use for asynchronous execution |
1842 |
jsr166 |
1.95 |
* @param <U> the function's return type |
1843 |
dl |
1.88 |
* @return the new CompletableFuture |
1844 |
|
|
*/ |
1845 |
|
|
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier, |
1846 |
|
|
Executor executor) { |
1847 |
dl |
1.113 |
return asyncSupplyStage(screenExecutor(executor), supplier); |
1848 |
dl |
1.28 |
} |
1849 |
|
|
|
1850 |
|
|
/** |
1851 |
jsr166 |
1.66 |
* Returns a new CompletableFuture that is asynchronously completed |
1852 |
|
|
* by a task running in the {@link ForkJoinPool#commonPool()} after |
1853 |
|
|
* it runs the given action. |
1854 |
dl |
1.28 |
* |
1855 |
|
|
* @param runnable the action to run before completing the |
1856 |
|
|
* returned CompletableFuture |
1857 |
jsr166 |
1.58 |
* @return the new CompletableFuture |
1858 |
dl |
1.28 |
*/ |
1859 |
|
|
public static CompletableFuture<Void> runAsync(Runnable runnable) { |
1860 |
dl |
1.113 |
return asyncRunStage(asyncPool, runnable); |
1861 |
dl |
1.28 |
} |
1862 |
|
|
|
1863 |
|
|
/** |
1864 |
jsr166 |
1.66 |
* Returns a new CompletableFuture that is asynchronously completed |
1865 |
|
|
* by a task running in the given executor after it runs the given |
1866 |
|
|
* action. |
1867 |
dl |
1.28 |
* |
1868 |
|
|
* @param runnable the action to run before completing the |
1869 |
|
|
* returned CompletableFuture |
1870 |
|
|
* @param executor the executor to use for asynchronous execution |
1871 |
jsr166 |
1.58 |
* @return the new CompletableFuture |
1872 |
dl |
1.28 |
*/ |
1873 |
|
|
public static CompletableFuture<Void> runAsync(Runnable runnable, |
1874 |
|
|
Executor executor) { |
1875 |
dl |
1.113 |
return asyncRunStage(screenExecutor(executor), runnable); |
1876 |
dl |
1.28 |
} |
1877 |
|
|
|
1878 |
|
|
/** |
1879 |
dl |
1.77 |
* Returns a new CompletableFuture that is already completed with |
1880 |
|
|
* the given value. |
1881 |
|
|
* |
1882 |
|
|
* @param value the value |
1883 |
jsr166 |
1.95 |
* @param <U> the type of the value |
1884 |
dl |
1.77 |
* @return the completed CompletableFuture |
1885 |
|
|
*/ |
1886 |
|
|
public static <U> CompletableFuture<U> completedFuture(U value) { |
1887 |
jsr166 |
1.128 |
return new CompletableFuture<U>((value == null) ? NIL : value); |
1888 |
dl |
1.77 |
} |
1889 |
|
|
|
1890 |
|
|
/** |
1891 |
dl |
1.28 |
* Returns {@code true} if completed in any fashion: normally, |
1892 |
|
|
* exceptionally, or via cancellation. |
1893 |
|
|
* |
1894 |
|
|
* @return {@code true} if completed |
1895 |
|
|
*/ |
1896 |
|
|
public boolean isDone() { |
1897 |
|
|
return result != null; |
1898 |
|
|
} |
1899 |
|
|
|
1900 |
|
|
/** |
1901 |
dl |
1.49 |
* Waits if necessary for this future to complete, and then |
1902 |
dl |
1.48 |
* returns its result. |
1903 |
dl |
1.28 |
* |
1904 |
dl |
1.48 |
* @return the result value |
1905 |
|
|
* @throws CancellationException if this future was cancelled |
1906 |
|
|
* @throws ExecutionException if this future completed exceptionally |
1907 |
dl |
1.28 |
* @throws InterruptedException if the current thread was interrupted |
1908 |
|
|
* while waiting |
1909 |
|
|
*/ |
1910 |
|
|
public T get() throws InterruptedException, ExecutionException { |
1911 |
jsr166 |
1.105 |
Object r; |
1912 |
jsr166 |
1.121 |
return reportGet((r = result) == null ? waitingGet(true) : r); |
1913 |
dl |
1.28 |
} |
1914 |
|
|
|
1915 |
|
|
/** |
1916 |
dl |
1.49 |
* Waits if necessary for at most the given time for this future |
1917 |
|
|
* to complete, and then returns its result, if available. |
1918 |
dl |
1.28 |
* |
1919 |
|
|
* @param timeout the maximum time to wait |
1920 |
|
|
* @param unit the time unit of the timeout argument |
1921 |
dl |
1.48 |
* @return the result value |
1922 |
|
|
* @throws CancellationException if this future was cancelled |
1923 |
|
|
* @throws ExecutionException if this future completed exceptionally |
1924 |
dl |
1.28 |
* @throws InterruptedException if the current thread was interrupted |
1925 |
|
|
* while waiting |
1926 |
|
|
* @throws TimeoutException if the wait timed out |
1927 |
|
|
*/ |
1928 |
|
|
public T get(long timeout, TimeUnit unit) |
1929 |
|
|
throws InterruptedException, ExecutionException, TimeoutException { |
1930 |
jsr166 |
1.105 |
Object r; |
1931 |
dl |
1.28 |
long nanos = unit.toNanos(timeout); |
1932 |
jsr166 |
1.121 |
return reportGet((r = result) == null ? timedGet(nanos) : r); |
1933 |
dl |
1.28 |
} |
1934 |
|
|
|
1935 |
|
|
/** |
1936 |
|
|
* Returns the result value when complete, or throws an |
1937 |
|
|
* (unchecked) exception if completed exceptionally. To better |
1938 |
|
|
* conform with the use of common functional forms, if a |
1939 |
|
|
* computation involved in the completion of this |
1940 |
|
|
* CompletableFuture threw an exception, this method throws an |
1941 |
|
|
* (unchecked) {@link CompletionException} with the underlying |
1942 |
|
|
* exception as its cause. |
1943 |
|
|
* |
1944 |
|
|
* @return the result value |
1945 |
|
|
* @throws CancellationException if the computation was cancelled |
1946 |
jsr166 |
1.55 |
* @throws CompletionException if this future completed |
1947 |
|
|
* exceptionally or a completion computation threw an exception |
1948 |
dl |
1.28 |
*/ |
1949 |
|
|
public T join() { |
1950 |
dl |
1.104 |
Object r; |
1951 |
jsr166 |
1.105 |
return reportJoin((r = result) == null ? waitingGet(false) : r); |
1952 |
dl |
1.28 |
} |
1953 |
|
|
|
1954 |
|
|
/** |
1955 |
|
|
* Returns the result value (or throws any encountered exception) |
1956 |
|
|
* if completed, else returns the given valueIfAbsent. |
1957 |
|
|
* |
1958 |
|
|
* @param valueIfAbsent the value to return if not completed |
1959 |
|
|
* @return the result value, if completed, else the given valueIfAbsent |
1960 |
|
|
* @throws CancellationException if the computation was cancelled |
1961 |
jsr166 |
1.55 |
* @throws CompletionException if this future completed |
1962 |
|
|
* exceptionally or a completion computation threw an exception |
1963 |
dl |
1.28 |
*/ |
1964 |
|
|
public T getNow(T valueIfAbsent) { |
1965 |
dl |
1.104 |
Object r; |
1966 |
jsr166 |
1.106 |
return ((r = result) == null) ? valueIfAbsent : reportJoin(r); |
1967 |
dl |
1.28 |
} |
1968 |
|
|
|
1969 |
|
|
/** |
1970 |
|
|
* If not already completed, sets the value returned by {@link |
1971 |
|
|
* #get()} and related methods to the given value. |
1972 |
|
|
* |
1973 |
|
|
* @param value the result value |
1974 |
|
|
* @return {@code true} if this invocation caused this CompletableFuture |
1975 |
|
|
* to transition to a completed state, else {@code false} |
1976 |
|
|
*/ |
1977 |
|
|
public boolean complete(T value) { |
1978 |
jsr166 |
1.127 |
boolean triggered = completeValue(value); |
1979 |
dl |
1.104 |
postComplete(); |
1980 |
dl |
1.28 |
return triggered; |
1981 |
|
|
} |
1982 |
|
|
|
1983 |
|
|
/** |
1984 |
|
|
* If not already completed, causes invocations of {@link #get()} |
1985 |
|
|
* and related methods to throw the given exception. |
1986 |
|
|
* |
1987 |
|
|
* @param ex the exception |
1988 |
|
|
* @return {@code true} if this invocation caused this CompletableFuture |
1989 |
|
|
* to transition to a completed state, else {@code false} |
1990 |
|
|
*/ |
1991 |
|
|
public boolean completeExceptionally(Throwable ex) { |
1992 |
|
|
if (ex == null) throw new NullPointerException(); |
1993 |
dl |
1.104 |
boolean triggered = internalComplete(new AltResult(ex)); |
1994 |
|
|
postComplete(); |
1995 |
dl |
1.28 |
return triggered; |
1996 |
|
|
} |
1997 |
|
|
|
1998 |
dl |
1.104 |
public <U> CompletableFuture<U> thenApply( |
1999 |
|
|
Function<? super T,? extends U> fn) { |
2000 |
dl |
1.113 |
return uniApplyStage(null, fn); |
2001 |
dl |
1.28 |
} |
2002 |
|
|
|
2003 |
dl |
1.104 |
public <U> CompletableFuture<U> thenApplyAsync( |
2004 |
|
|
Function<? super T,? extends U> fn) { |
2005 |
dl |
1.143 |
return uniApplyStage(defaultExecutor(), fn); |
2006 |
dl |
1.17 |
} |
2007 |
|
|
|
2008 |
dl |
1.104 |
public <U> CompletableFuture<U> thenApplyAsync( |
2009 |
|
|
Function<? super T,? extends U> fn, Executor executor) { |
2010 |
dl |
1.113 |
return uniApplyStage(screenExecutor(executor), fn); |
2011 |
dl |
1.28 |
} |
2012 |
dl |
1.1 |
|
2013 |
dl |
1.104 |
public CompletableFuture<Void> thenAccept(Consumer<? super T> action) { |
2014 |
dl |
1.113 |
return uniAcceptStage(null, action); |
2015 |
dl |
1.28 |
} |
2016 |
|
|
|
2017 |
dl |
1.104 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> action) { |
2018 |
dl |
1.143 |
return uniAcceptStage(defaultExecutor(), action); |
2019 |
dl |
1.28 |
} |
2020 |
|
|
|
2021 |
dl |
1.113 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> action, |
2022 |
|
|
Executor executor) { |
2023 |
|
|
return uniAcceptStage(screenExecutor(executor), action); |
2024 |
dl |
1.7 |
} |
2025 |
|
|
|
2026 |
dl |
1.104 |
public CompletableFuture<Void> thenRun(Runnable action) { |
2027 |
dl |
1.113 |
return uniRunStage(null, action); |
2028 |
dl |
1.28 |
} |
2029 |
|
|
|
2030 |
dl |
1.104 |
public CompletableFuture<Void> thenRunAsync(Runnable action) { |
2031 |
dl |
1.143 |
return uniRunStage(defaultExecutor(), action); |
2032 |
dl |
1.28 |
} |
2033 |
|
|
|
2034 |
dl |
1.113 |
public CompletableFuture<Void> thenRunAsync(Runnable action, |
2035 |
|
|
Executor executor) { |
2036 |
|
|
return uniRunStage(screenExecutor(executor), action); |
2037 |
dl |
1.28 |
} |
2038 |
|
|
|
2039 |
dl |
1.104 |
public <U,V> CompletableFuture<V> thenCombine( |
2040 |
|
|
CompletionStage<? extends U> other, |
2041 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
2042 |
dl |
1.113 |
return biApplyStage(null, other, fn); |
2043 |
dl |
1.28 |
} |
2044 |
|
|
|
2045 |
dl |
1.104 |
public <U,V> CompletableFuture<V> thenCombineAsync( |
2046 |
|
|
CompletionStage<? extends U> other, |
2047 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
2048 |
dl |
1.143 |
return biApplyStage(defaultExecutor(), other, fn); |
2049 |
dl |
1.28 |
} |
2050 |
|
|
|
2051 |
dl |
1.104 |
public <U,V> CompletableFuture<V> thenCombineAsync( |
2052 |
|
|
CompletionStage<? extends U> other, |
2053 |
dl |
1.113 |
BiFunction<? super T,? super U,? extends V> fn, Executor executor) { |
2054 |
|
|
return biApplyStage(screenExecutor(executor), other, fn); |
2055 |
dl |
1.1 |
} |
2056 |
|
|
|
2057 |
dl |
1.104 |
public <U> CompletableFuture<Void> thenAcceptBoth( |
2058 |
|
|
CompletionStage<? extends U> other, |
2059 |
|
|
BiConsumer<? super T, ? super U> action) { |
2060 |
dl |
1.113 |
return biAcceptStage(null, other, action); |
2061 |
dl |
1.28 |
} |
2062 |
|
|
|
2063 |
dl |
1.104 |
public <U> CompletableFuture<Void> thenAcceptBothAsync( |
2064 |
|
|
CompletionStage<? extends U> other, |
2065 |
|
|
BiConsumer<? super T, ? super U> action) { |
2066 |
dl |
1.143 |
return biAcceptStage(defaultExecutor(), other, action); |
2067 |
dl |
1.28 |
} |
2068 |
|
|
|
2069 |
dl |
1.104 |
public <U> CompletableFuture<Void> thenAcceptBothAsync( |
2070 |
|
|
CompletionStage<? extends U> other, |
2071 |
dl |
1.113 |
BiConsumer<? super T, ? super U> action, Executor executor) { |
2072 |
|
|
return biAcceptStage(screenExecutor(executor), other, action); |
2073 |
dl |
1.28 |
} |
2074 |
|
|
|
2075 |
dl |
1.113 |
public CompletableFuture<Void> runAfterBoth(CompletionStage<?> other, |
2076 |
|
|
Runnable action) { |
2077 |
|
|
return biRunStage(null, other, action); |
2078 |
dl |
1.7 |
} |
2079 |
|
|
|
2080 |
dl |
1.113 |
public CompletableFuture<Void> runAfterBothAsync(CompletionStage<?> other, |
2081 |
|
|
Runnable action) { |
2082 |
dl |
1.143 |
return biRunStage(defaultExecutor(), other, action); |
2083 |
dl |
1.28 |
} |
2084 |
|
|
|
2085 |
dl |
1.113 |
public CompletableFuture<Void> runAfterBothAsync(CompletionStage<?> other, |
2086 |
|
|
Runnable action, |
2087 |
|
|
Executor executor) { |
2088 |
|
|
return biRunStage(screenExecutor(executor), other, action); |
2089 |
dl |
1.28 |
} |
2090 |
|
|
|
2091 |
dl |
1.104 |
public <U> CompletableFuture<U> applyToEither( |
2092 |
|
|
CompletionStage<? extends T> other, Function<? super T, U> fn) { |
2093 |
dl |
1.113 |
return orApplyStage(null, other, fn); |
2094 |
dl |
1.28 |
} |
2095 |
|
|
|
2096 |
dl |
1.104 |
public <U> CompletableFuture<U> applyToEitherAsync( |
2097 |
|
|
CompletionStage<? extends T> other, Function<? super T, U> fn) { |
2098 |
dl |
1.143 |
return orApplyStage(defaultExecutor(), other, fn); |
2099 |
dl |
1.28 |
} |
2100 |
|
|
|
2101 |
dl |
1.113 |
public <U> CompletableFuture<U> applyToEitherAsync( |
2102 |
|
|
CompletionStage<? extends T> other, Function<? super T, U> fn, |
2103 |
|
|
Executor executor) { |
2104 |
|
|
return orApplyStage(screenExecutor(executor), other, fn); |
2105 |
dl |
1.1 |
} |
2106 |
|
|
|
2107 |
dl |
1.104 |
public CompletableFuture<Void> acceptEither( |
2108 |
|
|
CompletionStage<? extends T> other, Consumer<? super T> action) { |
2109 |
dl |
1.113 |
return orAcceptStage(null, other, action); |
2110 |
dl |
1.28 |
} |
2111 |
|
|
|
2112 |
dl |
1.113 |
public CompletableFuture<Void> acceptEitherAsync( |
2113 |
|
|
CompletionStage<? extends T> other, Consumer<? super T> action) { |
2114 |
dl |
1.143 |
return orAcceptStage(defaultExecutor(), other, action); |
2115 |
dl |
1.28 |
} |
2116 |
|
|
|
2117 |
dl |
1.104 |
public CompletableFuture<Void> acceptEitherAsync( |
2118 |
|
|
CompletionStage<? extends T> other, Consumer<? super T> action, |
2119 |
|
|
Executor executor) { |
2120 |
dl |
1.113 |
return orAcceptStage(screenExecutor(executor), other, action); |
2121 |
dl |
1.7 |
} |
2122 |
|
|
|
2123 |
dl |
1.113 |
public CompletableFuture<Void> runAfterEither(CompletionStage<?> other, |
2124 |
|
|
Runnable action) { |
2125 |
|
|
return orRunStage(null, other, action); |
2126 |
dl |
1.28 |
} |
2127 |
|
|
|
2128 |
dl |
1.113 |
public CompletableFuture<Void> runAfterEitherAsync(CompletionStage<?> other, |
2129 |
|
|
Runnable action) { |
2130 |
dl |
1.143 |
return orRunStage(defaultExecutor(), other, action); |
2131 |
dl |
1.28 |
} |
2132 |
|
|
|
2133 |
dl |
1.113 |
public CompletableFuture<Void> runAfterEitherAsync(CompletionStage<?> other, |
2134 |
|
|
Runnable action, |
2135 |
|
|
Executor executor) { |
2136 |
|
|
return orRunStage(screenExecutor(executor), other, action); |
2137 |
dl |
1.1 |
} |
2138 |
|
|
|
2139 |
dl |
1.113 |
public <U> CompletableFuture<U> thenCompose( |
2140 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn) { |
2141 |
|
|
return uniComposeStage(null, fn); |
2142 |
dl |
1.37 |
} |
2143 |
|
|
|
2144 |
dl |
1.104 |
public <U> CompletableFuture<U> thenComposeAsync( |
2145 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn) { |
2146 |
dl |
1.143 |
return uniComposeStage(defaultExecutor(), fn); |
2147 |
dl |
1.37 |
} |
2148 |
|
|
|
2149 |
dl |
1.104 |
public <U> CompletableFuture<U> thenComposeAsync( |
2150 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn, |
2151 |
|
|
Executor executor) { |
2152 |
dl |
1.113 |
return uniComposeStage(screenExecutor(executor), fn); |
2153 |
dl |
1.37 |
} |
2154 |
|
|
|
2155 |
dl |
1.104 |
public CompletableFuture<T> whenComplete( |
2156 |
|
|
BiConsumer<? super T, ? super Throwable> action) { |
2157 |
dl |
1.113 |
return uniWhenCompleteStage(null, action); |
2158 |
dl |
1.88 |
} |
2159 |
|
|
|
2160 |
dl |
1.104 |
public CompletableFuture<T> whenCompleteAsync( |
2161 |
|
|
BiConsumer<? super T, ? super Throwable> action) { |
2162 |
dl |
1.143 |
return uniWhenCompleteStage(defaultExecutor(), action); |
2163 |
dl |
1.88 |
} |
2164 |
|
|
|
2165 |
dl |
1.104 |
public CompletableFuture<T> whenCompleteAsync( |
2166 |
|
|
BiConsumer<? super T, ? super Throwable> action, Executor executor) { |
2167 |
dl |
1.113 |
return uniWhenCompleteStage(screenExecutor(executor), action); |
2168 |
dl |
1.88 |
} |
2169 |
|
|
|
2170 |
dl |
1.104 |
public <U> CompletableFuture<U> handle( |
2171 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn) { |
2172 |
dl |
1.113 |
return uniHandleStage(null, fn); |
2173 |
dl |
1.88 |
} |
2174 |
|
|
|
2175 |
dl |
1.104 |
public <U> CompletableFuture<U> handleAsync( |
2176 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn) { |
2177 |
dl |
1.143 |
return uniHandleStage(defaultExecutor(), fn); |
2178 |
dl |
1.88 |
} |
2179 |
|
|
|
2180 |
dl |
1.104 |
public <U> CompletableFuture<U> handleAsync( |
2181 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn, Executor executor) { |
2182 |
dl |
1.113 |
return uniHandleStage(screenExecutor(executor), fn); |
2183 |
dl |
1.88 |
} |
2184 |
|
|
|
2185 |
|
|
/** |
2186 |
jsr166 |
1.108 |
* Returns this CompletableFuture. |
2187 |
dl |
1.88 |
* |
2188 |
|
|
* @return this CompletableFuture |
2189 |
|
|
*/ |
2190 |
|
|
public CompletableFuture<T> toCompletableFuture() { |
2191 |
|
|
return this; |
2192 |
dl |
1.28 |
} |
2193 |
|
|
|
2194 |
dl |
1.88 |
// not in interface CompletionStage |
2195 |
|
|
|
2196 |
dl |
1.28 |
/** |
2197 |
jsr166 |
1.66 |
* Returns a new CompletableFuture that is completed when this |
2198 |
|
|
* CompletableFuture completes, with the result of the given |
2199 |
|
|
* function of the exception triggering this CompletableFuture's |
2200 |
|
|
* completion when it completes exceptionally; otherwise, if this |
2201 |
|
|
* CompletableFuture completes normally, then the returned |
2202 |
|
|
* CompletableFuture also completes normally with the same value. |
2203 |
dl |
1.88 |
* Note: More flexible versions of this functionality are |
2204 |
|
|
* available using methods {@code whenComplete} and {@code handle}. |
2205 |
dl |
1.28 |
* |
2206 |
|
|
* @param fn the function to use to compute the value of the |
2207 |
|
|
* returned CompletableFuture if this CompletableFuture completed |
2208 |
|
|
* exceptionally |
2209 |
|
|
* @return the new CompletableFuture |
2210 |
|
|
*/ |
2211 |
dl |
1.104 |
public CompletableFuture<T> exceptionally( |
2212 |
|
|
Function<Throwable, ? extends T> fn) { |
2213 |
dl |
1.113 |
return uniExceptionallyStage(fn); |
2214 |
dl |
1.28 |
} |
2215 |
|
|
|
2216 |
dl |
1.143 |
|
2217 |
dl |
1.35 |
/* ------------- Arbitrary-arity constructions -------------- */ |
2218 |
|
|
|
2219 |
|
|
/** |
2220 |
|
|
* Returns a new CompletableFuture that is completed when all of |
2221 |
jsr166 |
1.66 |
* the given CompletableFutures complete. If any of the given |
2222 |
jsr166 |
1.69 |
* CompletableFutures complete exceptionally, then the returned |
2223 |
|
|
* CompletableFuture also does so, with a CompletionException |
2224 |
|
|
* holding this exception as its cause. Otherwise, the results, |
2225 |
|
|
* if any, of the given CompletableFutures are not reflected in |
2226 |
|
|
* the returned CompletableFuture, but may be obtained by |
2227 |
|
|
* inspecting them individually. If no CompletableFutures are |
2228 |
|
|
* provided, returns a CompletableFuture completed with the value |
2229 |
|
|
* {@code null}. |
2230 |
dl |
1.35 |
* |
2231 |
|
|
* <p>Among the applications of this method is to await completion |
2232 |
|
|
* of a set of independent CompletableFutures before continuing a |
2233 |
|
|
* program, as in: {@code CompletableFuture.allOf(c1, c2, |
2234 |
|
|
* c3).join();}. |
2235 |
|
|
* |
2236 |
|
|
* @param cfs the CompletableFutures |
2237 |
jsr166 |
1.59 |
* @return a new CompletableFuture that is completed when all of the |
2238 |
dl |
1.35 |
* given CompletableFutures complete |
2239 |
|
|
* @throws NullPointerException if the array or any of its elements are |
2240 |
|
|
* {@code null} |
2241 |
|
|
*/ |
2242 |
|
|
public static CompletableFuture<Void> allOf(CompletableFuture<?>... cfs) { |
2243 |
dl |
1.113 |
return andTree(cfs, 0, cfs.length - 1); |
2244 |
dl |
1.35 |
} |
2245 |
|
|
|
2246 |
|
|
/** |
2247 |
dl |
1.76 |
* Returns a new CompletableFuture that is completed when any of |
2248 |
jsr166 |
1.79 |
* the given CompletableFutures complete, with the same result. |
2249 |
|
|
* Otherwise, if it completed exceptionally, the returned |
2250 |
dl |
1.77 |
* CompletableFuture also does so, with a CompletionException |
2251 |
|
|
* holding this exception as its cause. If no CompletableFutures |
2252 |
|
|
* are provided, returns an incomplete CompletableFuture. |
2253 |
dl |
1.35 |
* |
2254 |
|
|
* @param cfs the CompletableFutures |
2255 |
dl |
1.77 |
* @return a new CompletableFuture that is completed with the |
2256 |
|
|
* result or exception of any of the given CompletableFutures when |
2257 |
|
|
* one completes |
2258 |
dl |
1.35 |
* @throws NullPointerException if the array or any of its elements are |
2259 |
|
|
* {@code null} |
2260 |
|
|
*/ |
2261 |
dl |
1.77 |
public static CompletableFuture<Object> anyOf(CompletableFuture<?>... cfs) { |
2262 |
dl |
1.113 |
return orTree(cfs, 0, cfs.length - 1); |
2263 |
dl |
1.35 |
} |
2264 |
|
|
|
2265 |
|
|
/* ------------- Control and status methods -------------- */ |
2266 |
|
|
|
2267 |
dl |
1.28 |
/** |
2268 |
dl |
1.37 |
* If not already completed, completes this CompletableFuture with |
2269 |
|
|
* a {@link CancellationException}. Dependent CompletableFutures |
2270 |
|
|
* that have not already completed will also complete |
2271 |
|
|
* exceptionally, with a {@link CompletionException} caused by |
2272 |
|
|
* this {@code CancellationException}. |
2273 |
dl |
1.28 |
* |
2274 |
|
|
* @param mayInterruptIfRunning this value has no effect in this |
2275 |
|
|
* implementation because interrupts are not used to control |
2276 |
|
|
* processing. |
2277 |
|
|
* |
2278 |
|
|
* @return {@code true} if this task is now cancelled |
2279 |
|
|
*/ |
2280 |
|
|
public boolean cancel(boolean mayInterruptIfRunning) { |
2281 |
dl |
1.46 |
boolean cancelled = (result == null) && |
2282 |
dl |
1.104 |
internalComplete(new AltResult(new CancellationException())); |
2283 |
|
|
postComplete(); |
2284 |
dl |
1.48 |
return cancelled || isCancelled(); |
2285 |
dl |
1.28 |
} |
2286 |
|
|
|
2287 |
|
|
/** |
2288 |
|
|
* Returns {@code true} if this CompletableFuture was cancelled |
2289 |
|
|
* before it completed normally. |
2290 |
|
|
* |
2291 |
|
|
* @return {@code true} if this CompletableFuture was cancelled |
2292 |
|
|
* before it completed normally |
2293 |
|
|
*/ |
2294 |
|
|
public boolean isCancelled() { |
2295 |
|
|
Object r; |
2296 |
jsr166 |
1.43 |
return ((r = result) instanceof AltResult) && |
2297 |
|
|
(((AltResult)r).ex instanceof CancellationException); |
2298 |
dl |
1.28 |
} |
2299 |
|
|
|
2300 |
|
|
/** |
2301 |
dl |
1.88 |
* Returns {@code true} if this CompletableFuture completed |
2302 |
dl |
1.91 |
* exceptionally, in any way. Possible causes include |
2303 |
|
|
* cancellation, explicit invocation of {@code |
2304 |
|
|
* completeExceptionally}, and abrupt termination of a |
2305 |
|
|
* CompletionStage action. |
2306 |
dl |
1.88 |
* |
2307 |
|
|
* @return {@code true} if this CompletableFuture completed |
2308 |
|
|
* exceptionally |
2309 |
|
|
*/ |
2310 |
|
|
public boolean isCompletedExceptionally() { |
2311 |
dl |
1.91 |
Object r; |
2312 |
|
|
return ((r = result) instanceof AltResult) && r != NIL; |
2313 |
dl |
1.88 |
} |
2314 |
|
|
|
2315 |
|
|
/** |
2316 |
dl |
1.28 |
* Forcibly sets or resets the value subsequently returned by |
2317 |
jsr166 |
1.42 |
* method {@link #get()} and related methods, whether or not |
2318 |
|
|
* already completed. This method is designed for use only in |
2319 |
|
|
* error recovery actions, and even in such situations may result |
2320 |
|
|
* in ongoing dependent completions using established versus |
2321 |
dl |
1.30 |
* overwritten outcomes. |
2322 |
dl |
1.28 |
* |
2323 |
|
|
* @param value the completion value |
2324 |
|
|
*/ |
2325 |
|
|
public void obtrudeValue(T value) { |
2326 |
|
|
result = (value == null) ? NIL : value; |
2327 |
dl |
1.104 |
postComplete(); |
2328 |
dl |
1.28 |
} |
2329 |
|
|
|
2330 |
dl |
1.30 |
/** |
2331 |
jsr166 |
1.41 |
* Forcibly causes subsequent invocations of method {@link #get()} |
2332 |
|
|
* and related methods to throw the given exception, whether or |
2333 |
|
|
* not already completed. This method is designed for use only in |
2334 |
jsr166 |
1.119 |
* error recovery actions, and even in such situations may result |
2335 |
|
|
* in ongoing dependent completions using established versus |
2336 |
dl |
1.30 |
* overwritten outcomes. |
2337 |
|
|
* |
2338 |
|
|
* @param ex the exception |
2339 |
jsr166 |
1.120 |
* @throws NullPointerException if the exception is null |
2340 |
dl |
1.30 |
*/ |
2341 |
|
|
public void obtrudeException(Throwable ex) { |
2342 |
|
|
if (ex == null) throw new NullPointerException(); |
2343 |
|
|
result = new AltResult(ex); |
2344 |
dl |
1.104 |
postComplete(); |
2345 |
dl |
1.30 |
} |
2346 |
|
|
|
2347 |
dl |
1.35 |
/** |
2348 |
|
|
* Returns the estimated number of CompletableFutures whose |
2349 |
|
|
* completions are awaiting completion of this CompletableFuture. |
2350 |
|
|
* This method is designed for use in monitoring system state, not |
2351 |
|
|
* for synchronization control. |
2352 |
|
|
* |
2353 |
|
|
* @return the number of dependent CompletableFutures |
2354 |
|
|
*/ |
2355 |
|
|
public int getNumberOfDependents() { |
2356 |
|
|
int count = 0; |
2357 |
dl |
1.113 |
for (Completion p = stack; p != null; p = p.next) |
2358 |
dl |
1.35 |
++count; |
2359 |
|
|
return count; |
2360 |
|
|
} |
2361 |
|
|
|
2362 |
|
|
/** |
2363 |
|
|
* Returns a string identifying this CompletableFuture, as well as |
2364 |
jsr166 |
1.40 |
* its completion state. The state, in brackets, contains the |
2365 |
dl |
1.35 |
* String {@code "Completed Normally"} or the String {@code |
2366 |
|
|
* "Completed Exceptionally"}, or the String {@code "Not |
2367 |
|
|
* completed"} followed by the number of CompletableFutures |
2368 |
|
|
* dependent upon its completion, if any. |
2369 |
|
|
* |
2370 |
|
|
* @return a string identifying this CompletableFuture, as well as its state |
2371 |
|
|
*/ |
2372 |
|
|
public String toString() { |
2373 |
|
|
Object r = result; |
2374 |
dl |
1.143 |
int count = 0; // avoid call to getNumberOfDependents in case disabled |
2375 |
|
|
for (Completion p = stack; p != null; p = p.next) |
2376 |
|
|
++count; |
2377 |
jsr166 |
1.40 |
return super.toString() + |
2378 |
|
|
((r == null) ? |
2379 |
dl |
1.143 |
((count == 0) ? |
2380 |
jsr166 |
1.40 |
"[Not completed]" : |
2381 |
|
|
"[Not completed, " + count + " dependents]") : |
2382 |
|
|
(((r instanceof AltResult) && ((AltResult)r).ex != null) ? |
2383 |
|
|
"[Completed exceptionally]" : |
2384 |
|
|
"[Completed normally]")); |
2385 |
dl |
1.35 |
} |
2386 |
|
|
|
2387 |
dl |
1.143 |
// jdk9 additions |
2388 |
|
|
|
2389 |
|
|
/** |
2390 |
|
|
* Creates a new incomplete CompletableFuture of the type to be |
2391 |
|
|
* returned by a CompletionStage method. Subclasses should |
2392 |
|
|
* normally override this method to return an instance of the same |
2393 |
|
|
* class as this CompletableFuture. The default implementation |
2394 |
|
|
* returns an instance of class CompletableFuture. |
2395 |
|
|
* |
2396 |
|
|
* @return a new CompletableFuture |
2397 |
|
|
* @param <U> the type of the value |
2398 |
|
|
* @since 1.9 |
2399 |
|
|
*/ |
2400 |
|
|
public <U> CompletableFuture<U> newIncompleteFuture() { |
2401 |
|
|
return new CompletableFuture<U>(); |
2402 |
|
|
} |
2403 |
|
|
/** |
2404 |
|
|
* Returns the default Executor used for async methods that do not |
2405 |
|
|
* specify an Executor. This class uses the {@link |
2406 |
|
|
* ForkJoinPool#commonPool()}, but may be overridden in subclasses |
2407 |
|
|
* with an Executor that provides at least one independent thread. |
2408 |
|
|
* |
2409 |
|
|
* @return the executor |
2410 |
|
|
* @since 1.9 |
2411 |
|
|
*/ |
2412 |
|
|
public Executor defaultExecutor() { |
2413 |
|
|
return asyncPool; |
2414 |
|
|
} |
2415 |
|
|
|
2416 |
|
|
/** |
2417 |
|
|
* Returns a new CompletableFuture that is completed normally with |
2418 |
jsr166 |
1.144 |
* the same value as this CompletableFuture when it completes |
2419 |
dl |
1.143 |
* normally. If this CompletableFuture completes exceptionally, |
2420 |
|
|
* then the returned CompletableFuture completes exceptionally |
2421 |
|
|
* with a CompletionException with this exception as cause. The |
2422 |
|
|
* behavior equivalent is to {@code thenApply(x -> x)}. This |
2423 |
|
|
* method may be useful as a form of "defensive copying", to |
2424 |
|
|
* prevent clients from completing, while still being able to |
2425 |
|
|
* arrange dependent actions. |
2426 |
|
|
* |
2427 |
|
|
* @return the new CompletableFuture |
2428 |
|
|
* @since 1.9 |
2429 |
|
|
*/ |
2430 |
|
|
public CompletableFuture<T> copy() { |
2431 |
|
|
return uniCopyStage(); |
2432 |
|
|
} |
2433 |
|
|
|
2434 |
|
|
/** |
2435 |
|
|
* Returns a new CompletionStage that is completed normally with |
2436 |
jsr166 |
1.144 |
* the same value as this CompletableFuture when it completes |
2437 |
dl |
1.143 |
* normally, and cannot be independently completed or otherwise |
2438 |
|
|
* used in ways not defined by the methods of interface {@link |
2439 |
|
|
* CompletionStage}. If this CompletableFuture completes |
2440 |
|
|
* exceptionally, then the returned CompletionStage completes |
2441 |
|
|
* exceptionally with a CompletionException with this exception as |
2442 |
|
|
* cause. |
2443 |
|
|
* |
2444 |
|
|
* @return the new CompletionStage |
2445 |
|
|
* @since 1.9 |
2446 |
|
|
*/ |
2447 |
|
|
public CompletionStage<T> minimalCompletionStage() { |
2448 |
|
|
return uniAsMinimalStage(); |
2449 |
|
|
} |
2450 |
|
|
|
2451 |
|
|
/** |
2452 |
|
|
* Completes this CompletableFuture with the result of |
2453 |
|
|
* the given Supplier function invoked from an asynchronous |
2454 |
|
|
* task using the given executor. |
2455 |
|
|
* |
2456 |
|
|
* @param supplier a function returning the value to be used |
2457 |
|
|
* to complete this CompletableFuture |
2458 |
|
|
* @param executor the executor to use for asynchronous execution |
2459 |
|
|
* @return this CompletableFuture |
2460 |
|
|
* @since 1.9 |
2461 |
|
|
*/ |
2462 |
|
|
public CompletableFuture<T> completeAsync(Supplier<T> supplier, |
2463 |
|
|
Executor executor) { |
2464 |
|
|
if (supplier == null || executor == null) |
2465 |
|
|
throw new NullPointerException(); |
2466 |
|
|
executor.execute(new AsyncSupply<T>(this, supplier)); |
2467 |
|
|
return this; |
2468 |
|
|
} |
2469 |
|
|
|
2470 |
|
|
/** |
2471 |
|
|
* Completes this CompletableFuture with the result of the given |
2472 |
|
|
* Supplier function invoked from an asynchronous task using the |
2473 |
|
|
* the default executor. |
2474 |
|
|
* |
2475 |
|
|
* @param supplier a function returning the value to be used |
2476 |
|
|
* to complete this CompletableFuture |
2477 |
|
|
* @return this CompletableFuture |
2478 |
|
|
* @since 1.9 |
2479 |
|
|
*/ |
2480 |
|
|
public CompletableFuture<T> completeAsync(Supplier<T> supplier) { |
2481 |
|
|
return completeAsync(supplier, defaultExecutor()); |
2482 |
|
|
} |
2483 |
|
|
|
2484 |
|
|
/** |
2485 |
|
|
* Exceptionally completes this CompletableFuture with |
2486 |
|
|
* a {@link TimeoutException} if not otherwise completed |
2487 |
|
|
* before the given timeout. |
2488 |
|
|
* |
2489 |
|
|
* @param timeout how long to wait before completing exceptionally |
2490 |
|
|
* with a TimeoutException, in units of {@code unit} |
2491 |
|
|
* @param unit a {@code TimeUnit} determining how to interpret the |
2492 |
|
|
* {@code timeout} parameter |
2493 |
|
|
* @return this CompletableFuture |
2494 |
|
|
* @since 1.9 |
2495 |
|
|
*/ |
2496 |
|
|
public CompletableFuture<T> orTimeout(long timeout, TimeUnit unit) { |
2497 |
|
|
if (result == null) |
2498 |
|
|
whenComplete(new Canceller(Delayer.delay(new Timeout(this), |
2499 |
|
|
timeout, unit))); |
2500 |
|
|
return this; |
2501 |
|
|
} |
2502 |
|
|
|
2503 |
|
|
/** |
2504 |
|
|
* Returns a new Executor that submits a task to the given base |
2505 |
|
|
* executor after the given delay. |
2506 |
|
|
* |
2507 |
|
|
* @param delay how long to delay, in units of {@code unit} |
2508 |
|
|
* @param unit a {@code TimeUnit} determining how to interpret the |
2509 |
|
|
* {@code delay} parameter |
2510 |
|
|
* @param executor the base executor |
2511 |
|
|
* @return the new delayed executor |
2512 |
|
|
* @since 1.9 |
2513 |
|
|
*/ |
2514 |
|
|
public static Executor delayedExecutor(long delay, TimeUnit unit, |
2515 |
|
|
Executor executor) { |
2516 |
|
|
if (unit == null || executor == null) |
2517 |
|
|
throw new NullPointerException(); |
2518 |
|
|
return new DelayedExecutor(delay, unit, executor); |
2519 |
|
|
} |
2520 |
|
|
|
2521 |
|
|
/** |
2522 |
|
|
* Returns a new Executor that submits a task to the default |
2523 |
|
|
* executor after the given delay. |
2524 |
|
|
* |
2525 |
|
|
* @param delay how long to delay, in units of {@code unit} |
2526 |
|
|
* @param unit a {@code TimeUnit} determining how to interpret the |
2527 |
|
|
* {@code delay} parameter |
2528 |
|
|
* @return the new delayed executor |
2529 |
|
|
* @since 1.9 |
2530 |
|
|
*/ |
2531 |
|
|
public static Executor delayedExecutor(long delay, TimeUnit unit) { |
2532 |
|
|
return new DelayedExecutor(delay, unit, asyncPool); |
2533 |
|
|
} |
2534 |
|
|
|
2535 |
|
|
/** |
2536 |
|
|
* Returns a new CompletionStage that is already completed with |
2537 |
|
|
* the given value and supports only those methods in |
2538 |
|
|
* interface {@link CompletionStage}. |
2539 |
|
|
* |
2540 |
|
|
* @param value the value |
2541 |
|
|
* @param <U> the type of the value |
2542 |
|
|
* @return the completed CompletionStage |
2543 |
|
|
* @since 1.9 |
2544 |
|
|
*/ |
2545 |
|
|
public static <U> CompletionStage<U> completedStage(U value) { |
2546 |
|
|
return new MinimalStage<U>((value == null) ? NIL : value); |
2547 |
|
|
} |
2548 |
|
|
|
2549 |
|
|
/** |
2550 |
|
|
* Returns a new CompletableFuture that is already completed |
2551 |
|
|
* exceptionally with the given exception. |
2552 |
|
|
* |
2553 |
|
|
* @param ex the ex |
2554 |
|
|
* @param <U> the type of the value |
2555 |
|
|
* @return the exceptionally completed CompletableFuture |
2556 |
|
|
* @since 1.9 |
2557 |
|
|
*/ |
2558 |
|
|
public static <U> CompletableFuture<U> failedFuture(Throwable ex) { |
2559 |
|
|
if (ex == null) throw new NullPointerException(); |
2560 |
|
|
return new CompletableFuture<U>(encodeThrowable(ex)); |
2561 |
|
|
} |
2562 |
|
|
|
2563 |
|
|
/** |
2564 |
|
|
* Returns a new CompletionStage that is already completed |
2565 |
|
|
* exceptionally with the given exception and supports only those |
2566 |
|
|
* methods in interface {@link CompletionStage}. |
2567 |
|
|
* |
2568 |
|
|
* @param ex the ex |
2569 |
|
|
* @param <U> the type of the value |
2570 |
|
|
* @return the exceptionally completed CompletionStage |
2571 |
|
|
* @since 1.9 |
2572 |
|
|
*/ |
2573 |
|
|
public static <U> CompletableFuture<U> failedStage(Throwable ex) { |
2574 |
|
|
if (ex == null) throw new NullPointerException(); |
2575 |
|
|
return new MinimalStage<U>(encodeThrowable(ex)); |
2576 |
|
|
} |
2577 |
|
|
|
2578 |
|
|
/** |
2579 |
|
|
* Singleton delay scheduler, used only for starting and |
2580 |
|
|
* cancelling tasks. |
2581 |
|
|
*/ |
2582 |
|
|
static final class Delayer extends ScheduledThreadPoolExecutor { |
2583 |
|
|
static final class DaemonThreadFactory implements ThreadFactory { |
2584 |
|
|
public Thread newThread(Runnable r) { |
2585 |
|
|
Thread t = new Thread(r); |
2586 |
|
|
t.setDaemon(true); |
2587 |
|
|
t.setName("CompletableFutureDelayScheduler"); |
2588 |
|
|
return t; |
2589 |
|
|
} |
2590 |
|
|
} |
2591 |
|
|
Delayer() { |
2592 |
|
|
super(1, new DaemonThreadFactory()); |
2593 |
|
|
setRemoveOnCancelPolicy(true); |
2594 |
|
|
} |
2595 |
|
|
static final Delayer instance = new Delayer(); |
2596 |
|
|
|
2597 |
|
|
public static ScheduledFuture<?> delay(Runnable command, |
2598 |
|
|
long delay, |
2599 |
|
|
TimeUnit unit) { |
2600 |
|
|
return instance.schedule(command, delay, unit); |
2601 |
|
|
} |
2602 |
|
|
} |
2603 |
|
|
|
2604 |
|
|
// Little class-ified lambdas to better support monitoring |
2605 |
|
|
|
2606 |
|
|
static final class DelayedExecutor implements Executor { |
2607 |
|
|
final long delay; |
2608 |
|
|
final TimeUnit unit; |
2609 |
|
|
final Executor executor; |
2610 |
|
|
DelayedExecutor(long delay, TimeUnit unit, Executor executor) { |
2611 |
|
|
this.delay = delay; this.unit = unit; this.executor = executor; |
2612 |
|
|
} |
2613 |
|
|
public void execute(Runnable r) { |
2614 |
|
|
Delayer.delay(new Submitter(executor, r), delay, unit); |
2615 |
|
|
} |
2616 |
|
|
} |
2617 |
|
|
|
2618 |
|
|
/** Delay action to asynchronously start user task */ |
2619 |
|
|
static final class Submitter implements Runnable { |
2620 |
|
|
final Executor executor; |
2621 |
|
|
final Runnable action; |
2622 |
|
|
Submitter(Executor executor, Runnable action) { |
2623 |
|
|
this.executor = executor; |
2624 |
|
|
this.action = action; |
2625 |
|
|
} |
2626 |
|
|
public void run() { executor.execute(action); } |
2627 |
|
|
} |
2628 |
|
|
|
2629 |
|
|
/** Action to completeExceptionally on timeout */ |
2630 |
|
|
static final class Timeout implements Runnable { |
2631 |
|
|
final CompletableFuture<?> f; |
2632 |
|
|
Timeout(CompletableFuture<?> f) { this.f = f; } |
2633 |
|
|
public void run() { |
2634 |
|
|
if (f != null && !f.isDone()) |
2635 |
|
|
f.completeExceptionally(new TimeoutException()); |
2636 |
|
|
} |
2637 |
|
|
} |
2638 |
|
|
|
2639 |
|
|
/** Action to cancel unneeded timeouts */ |
2640 |
|
|
static final class Canceller implements BiConsumer<Object, Throwable> { |
2641 |
|
|
final Future<?> f; |
2642 |
|
|
Canceller(Future<?> f) { this.f = f; } |
2643 |
|
|
public void accept(Object ignore, Throwable ex) { |
2644 |
|
|
if (ex == null && f != null && !f.isDone()) |
2645 |
|
|
f.cancel(false); |
2646 |
|
|
} |
2647 |
|
|
} |
2648 |
|
|
|
2649 |
|
|
// MinimalStage subclass just throws UOE for non-CompletionStage methods |
2650 |
|
|
static final class MinimalStage<T> extends CompletableFuture<T> { |
2651 |
|
|
MinimalStage() { } |
2652 |
|
|
MinimalStage(Object r) { super(r); } |
2653 |
|
|
public <U> CompletableFuture<U> newIncompleteFuture() { |
2654 |
|
|
return new MinimalStage<U>(); } |
2655 |
|
|
public T get() { |
2656 |
|
|
throw new UnsupportedOperationException(); } |
2657 |
|
|
public T get(long timeout, TimeUnit unit) { |
2658 |
|
|
throw new UnsupportedOperationException(); } |
2659 |
|
|
public T getNow(T valueIfAbsent) { |
2660 |
|
|
throw new UnsupportedOperationException(); } |
2661 |
|
|
public T join() { |
2662 |
|
|
throw new UnsupportedOperationException(); } |
2663 |
|
|
public boolean complete(T value) { |
2664 |
|
|
throw new UnsupportedOperationException(); } |
2665 |
|
|
public boolean completeExceptionally(Throwable ex) { |
2666 |
|
|
throw new UnsupportedOperationException(); } |
2667 |
|
|
public boolean cancel(boolean mayInterruptIfRunning) { |
2668 |
|
|
throw new UnsupportedOperationException(); } |
2669 |
|
|
public void obtrudeValue(T value) { |
2670 |
|
|
throw new UnsupportedOperationException(); } |
2671 |
|
|
public void obtrudeException(Throwable ex) { |
2672 |
|
|
throw new UnsupportedOperationException(); } |
2673 |
|
|
public boolean isDone() { |
2674 |
|
|
throw new UnsupportedOperationException(); } |
2675 |
|
|
public boolean isCancelled() { |
2676 |
|
|
throw new UnsupportedOperationException(); } |
2677 |
|
|
public boolean isCompletedExceptionally() { |
2678 |
|
|
throw new UnsupportedOperationException(); } |
2679 |
|
|
public int getNumberOfDependents() { |
2680 |
|
|
throw new UnsupportedOperationException(); } |
2681 |
|
|
} |
2682 |
|
|
|
2683 |
dl |
1.1 |
// Unsafe mechanics |
2684 |
jsr166 |
1.138 |
private static final sun.misc.Unsafe U = sun.misc.Unsafe.getUnsafe(); |
2685 |
dl |
1.1 |
private static final long RESULT; |
2686 |
dl |
1.113 |
private static final long STACK; |
2687 |
jsr166 |
1.134 |
private static final long NEXT; |
2688 |
dl |
1.1 |
static { |
2689 |
|
|
try { |
2690 |
jsr166 |
1.138 |
RESULT = U.objectFieldOffset |
2691 |
|
|
(CompletableFuture.class.getDeclaredField("result")); |
2692 |
|
|
STACK = U.objectFieldOffset |
2693 |
|
|
(CompletableFuture.class.getDeclaredField("stack")); |
2694 |
|
|
NEXT = U.objectFieldOffset |
2695 |
jsr166 |
1.134 |
(Completion.class.getDeclaredField("next")); |
2696 |
jsr166 |
1.137 |
} catch (ReflectiveOperationException e) { |
2697 |
|
|
throw new Error(e); |
2698 |
dl |
1.1 |
} |
2699 |
|
|
} |
2700 |
|
|
} |