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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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|
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package jsr166e; |
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import java.util.concurrent.Future; |
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import java.util.concurrent.TimeUnit; |
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import java.util.concurrent.Executor; |
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import java.util.concurrent.ThreadLocalRandom; |
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import java.util.concurrent.ExecutionException; |
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import java.util.concurrent.TimeoutException; |
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import java.util.concurrent.CancellationException; |
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import java.util.concurrent.atomic.AtomicInteger; |
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import java.util.concurrent.locks.LockSupport; |
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|
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/** |
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* A {@link Future} that may be explicitly completed (setting its |
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* value and status), and may include dependent functions and actions |
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* that trigger upon its completion. Methods are available for adding |
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* those based on Functions, Blocks, and Runnables, depending on |
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* whether they require arguments and/or produce results, as well as |
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* those triggered after either or both the current and another |
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* CompletableFuture complete. Functions and actions supplied for |
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* dependent completions (mainly using methods with prefix {@code |
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* then}) may be performed by the thread that completes the current |
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* CompletableFuture, or by any other caller of these methods. There |
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* are no guarantees about the order of processing completions unless |
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* constrained by these methods. |
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* |
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* <p>When two or more threads attempt to {@link #complete} or {@link |
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* #completeExceptionally} a CompletableFuture, only one of them |
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* succeeds. |
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* |
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* <p>Upon exceptional completion, or when a completion entails |
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* computation of a function or action, and it terminates abruptly |
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* with an (unchecked) exception or error, then further completions |
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* act as {@code completeExceptionally} with a {@link |
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* CompletionException} holding that exception as its cause. If a |
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* CompletableFuture completes exceptionally, and is not followed by a |
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* {@link #exceptionally} or {@link #handle} completion, then all of |
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* its dependents (and their dependents) also complete exceptionally |
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* with CompletionExceptions holding the ultimate cause. In case of a |
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* CompletionException, methods {@link #get()} and {@link #get(long, |
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* TimeUnit)} throw an {@link ExecutionException} with the same cause |
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* as would be held in the corresponding CompletionException. However, |
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* in these cases, methods {@link #join()} and {@link #getNow} throw |
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* the CompletionException, which simplifies usage especially within |
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* other completion functions. |
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* |
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* <p>CompletableFutures themselves do not execute asynchronously. |
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* However, the {@code async} methods provide commonly useful ways to |
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* commence asynchronous processing, using either a given {@link |
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* Executor} or by default the {@link ForkJoinPool#commonPool()}, of a |
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* function or action that will result in the completion of a new |
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* CompletableFuture. To simplify monitoring, debugging, and tracking, |
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* all generated asynchronous tasks are instances of the tagging |
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* interface {@link AsynchronousCompletionTask}. |
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* |
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* <p><em>jsr166e note: During transition, this class |
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* uses nested functional interfaces with different names but the |
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* same forms as those expected for JDK8.</em> |
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* |
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* @author Doug Lea |
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* @since 1.8 |
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*/ |
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public class CompletableFuture<T> implements Future<T> { |
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// jsr166e nested interfaces |
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|
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/** Interface describing a void action of one argument */ |
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public interface Action<A> { void accept(A a); } |
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/** Interface describing a void action of two arguments */ |
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public interface BiAction<A,B> { void accept(A a, B b); } |
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/** Interface describing a function of one argument */ |
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public interface Fun<A,T> { T apply(A a); } |
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/** Interface describing a function of two arguments */ |
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public interface BiFun<A,B,T> { T apply(A a, B b); } |
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/** Interface describing a function of no arguments */ |
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public interface Generator<T> { T get(); } |
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|
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|
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/* |
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* Overview: |
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* |
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* 1. Non-nullness of field result (set via CAS) indicates done. |
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* An AltResult is used to box null as a result, as well as to |
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* hold exceptions. Using a single field makes completion fast |
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* and simple to detect and trigger, at the expense of a lot of |
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* encoding and decoding that infiltrates many methods. One minor |
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* simplification relies on the (static) NIL (to box null results) |
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* being the only AltResult with a null exception field, so we |
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* don't usually need explicit comparisons with NIL. The CF |
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* exception propagation mechanics surrounding decoding rely on |
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* unchecked casts of decoded results really being unchecked, |
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* where user type errors are caught at point of use, as is |
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* currently the case in Java. These are highlighted by using |
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* SuppressWarnings-annotated temporaries. |
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* |
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* 2. Waiters are held in a Treiber stack similar to the one used |
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* in FutureTask, Phaser, and SynchronousQueue. See their |
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* internal documentation for algorithmic details. |
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* |
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* 3. Completions are also kept in a list/stack, and pulled off |
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* and run when completion is triggered. (We could even use the |
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* same stack as for waiters, but would give up the potential |
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* parallelism obtained because woken waiters help release/run |
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* others -- see method postComplete). Because post-processing |
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* may race with direct calls, class Completion opportunistically |
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* extends AtomicInteger so callers can claim the action via |
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* compareAndSet(0, 1). The Completion.run methods are all |
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* written a boringly similar uniform way (that sometimes includes |
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* unnecessary-looking checks, kept to maintain uniformity). There |
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* are enough dimensions upon which they differ that factoring to |
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* use common code isn't worthwhile. |
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* |
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* 4. The exported then/and/or methods do support a bit of |
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* factoring (see doThenApply etc). They must cope with the |
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* intrinsic races surrounding addition of a dependent action |
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* versus performing the action directly because the task is |
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* already complete. For example, a CF may not be complete upon |
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* entry, so a dependent completion is added, but by the time it |
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* is added, the target CF is complete, so must be directly |
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* executed. This is all done while avoiding unnecessary object |
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* construction in safe-bypass cases. |
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*/ |
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|
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// preliminaries |
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|
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static final class AltResult { |
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final Throwable ex; // null only for NIL |
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AltResult(Throwable ex) { this.ex = ex; } |
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} |
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|
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static final AltResult NIL = new AltResult(null); |
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|
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// Fields |
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|
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volatile Object result; // Either the result or boxed AltResult |
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volatile WaitNode waiters; // Treiber stack of threads blocked on get() |
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volatile CompletionNode completions; // list (Treiber stack) of completions |
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|
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// Basic utilities for triggering and processing completions |
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|
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/** |
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* Removes and signals all waiting threads and runs all completions. |
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*/ |
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final void postComplete() { |
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WaitNode q; Thread t; |
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while ((q = waiters) != null) { |
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if (UNSAFE.compareAndSwapObject(this, WAITERS, q, q.next) && |
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(t = q.thread) != null) { |
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q.thread = null; |
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LockSupport.unpark(t); |
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} |
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} |
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|
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CompletionNode h; Completion c; |
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while ((h = completions) != null) { |
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if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, h, h.next) && |
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(c = h.completion) != null) |
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c.run(); |
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} |
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} |
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|
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/** |
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* Triggers completion with the encoding of the given arguments: |
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* if the exception is non-null, encodes it as a wrapped |
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* CompletionException unless it is one already. Otherwise uses |
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* the given result, boxed as NIL if null. |
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*/ |
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final void internalComplete(Object v, Throwable ex) { |
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if (result == null) |
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UNSAFE.compareAndSwapObject |
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(this, RESULT, null, |
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(ex == null) ? (v == null) ? NIL : v : |
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new AltResult((ex instanceof CompletionException) ? ex : |
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new CompletionException(ex))); |
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postComplete(); // help out even if not triggered |
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} |
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|
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/** |
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* If triggered, helps release and/or process completions. |
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*/ |
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final void helpPostComplete() { |
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if (result != null) |
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postComplete(); |
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} |
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|
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/* ------------- waiting for completions -------------- */ |
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|
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/** |
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* Heuristic spin value for waitingGet() before blocking on |
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* multiprocessors |
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*/ |
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static final int WAITING_GET_SPINS = 256; |
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|
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/** |
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* Linked nodes to record waiting threads in a Treiber stack. See |
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* other classes such as Phaser and SynchronousQueue for more |
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* detailed explanation. This class implements ManagedBlocker to |
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* avoid starvation when blocking actions pile up in |
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* ForkJoinPools. |
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*/ |
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static final class WaitNode implements ForkJoinPool.ManagedBlocker { |
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long nanos; // wait time if timed |
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final long deadline; // non-zero if timed |
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volatile int interruptControl; // > 0: interruptible, < 0: interrupted |
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volatile Thread thread; |
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volatile WaitNode next; |
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WaitNode(boolean interruptible, long nanos, long deadline) { |
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this.thread = Thread.currentThread(); |
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this.interruptControl = interruptible ? 1 : 0; |
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this.nanos = nanos; |
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this.deadline = deadline; |
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} |
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public boolean isReleasable() { |
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if (thread == null) |
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return true; |
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if (Thread.interrupted()) { |
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int i = interruptControl; |
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interruptControl = -1; |
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if (i > 0) |
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return true; |
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} |
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if (deadline != 0L && |
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(nanos <= 0L || (nanos = deadline - System.nanoTime()) <= 0L)) { |
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thread = null; |
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return true; |
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} |
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return false; |
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} |
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public boolean block() { |
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if (isReleasable()) |
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return true; |
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else if (deadline == 0L) |
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LockSupport.park(this); |
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else if (nanos > 0L) |
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LockSupport.parkNanos(this, nanos); |
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return isReleasable(); |
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} |
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} |
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|
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/** |
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* Returns raw result after waiting, or null if interruptible and |
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* interrupted. |
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*/ |
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private Object waitingGet(boolean interruptible) { |
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WaitNode q = null; |
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boolean queued = false; |
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int h = 0, spins = 0; |
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for (Object r;;) { |
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if ((r = result) != null) { |
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if (q != null) { // suppress unpark |
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q.thread = null; |
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if (q.interruptControl < 0) { |
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if (interruptible) { |
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removeWaiter(q); |
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return null; |
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} |
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Thread.currentThread().interrupt(); |
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} |
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} |
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postComplete(); // help release others |
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return r; |
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} |
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else if (h == 0) { |
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h = ThreadLocalRandom.current().nextInt(); |
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if (Runtime.getRuntime().availableProcessors() > 1) |
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spins = WAITING_GET_SPINS; |
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} |
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else if (spins > 0) { |
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h ^= h << 1; // xorshift |
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h ^= h >>> 3; |
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if ((h ^= h << 10) >= 0) |
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--spins; |
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} |
278 |
else if (q == null) |
279 |
q = new WaitNode(interruptible, 0L, 0L); |
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else if (!queued) |
281 |
queued = UNSAFE.compareAndSwapObject(this, WAITERS, |
282 |
q.next = waiters, q); |
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else if (interruptible && q.interruptControl < 0) { |
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removeWaiter(q); |
285 |
return null; |
286 |
} |
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else if (q.thread != null && result == null) { |
288 |
try { |
289 |
ForkJoinPool.managedBlock(q); |
290 |
} catch (InterruptedException ex) { |
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q.interruptControl = -1; |
292 |
} |
293 |
} |
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} |
295 |
} |
296 |
|
297 |
/** |
298 |
* Awaits completion or aborts on interrupt or timeout. |
299 |
* |
300 |
* @param nanos time to wait |
301 |
* @return raw result |
302 |
*/ |
303 |
private Object timedAwaitDone(long nanos) |
304 |
throws InterruptedException, TimeoutException { |
305 |
WaitNode q = null; |
306 |
boolean queued = false; |
307 |
for (Object r;;) { |
308 |
if ((r = result) != null) { |
309 |
if (q != null) { |
310 |
q.thread = null; |
311 |
if (q.interruptControl < 0) { |
312 |
removeWaiter(q); |
313 |
throw new InterruptedException(); |
314 |
} |
315 |
} |
316 |
postComplete(); |
317 |
return r; |
318 |
} |
319 |
else if (q == null) { |
320 |
if (nanos <= 0L) |
321 |
throw new TimeoutException(); |
322 |
long d = System.nanoTime() + nanos; |
323 |
q = new WaitNode(true, nanos, d == 0L ? 1L : d); // avoid 0 |
324 |
} |
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else if (!queued) |
326 |
queued = UNSAFE.compareAndSwapObject(this, WAITERS, |
327 |
q.next = waiters, q); |
328 |
else if (q.interruptControl < 0) { |
329 |
removeWaiter(q); |
330 |
throw new InterruptedException(); |
331 |
} |
332 |
else if (q.nanos <= 0L) { |
333 |
if (result == null) { |
334 |
removeWaiter(q); |
335 |
throw new TimeoutException(); |
336 |
} |
337 |
} |
338 |
else if (q.thread != null && result == null) { |
339 |
try { |
340 |
ForkJoinPool.managedBlock(q); |
341 |
} catch (InterruptedException ex) { |
342 |
q.interruptControl = -1; |
343 |
} |
344 |
} |
345 |
} |
346 |
} |
347 |
|
348 |
/** |
349 |
* Tries to unlink a timed-out or interrupted wait node to avoid |
350 |
* accumulating garbage. Internal nodes are simply unspliced |
351 |
* without CAS since it is harmless if they are traversed anyway |
352 |
* by releasers. To avoid effects of unsplicing from already |
353 |
* removed nodes, the list is retraversed in case of an apparent |
354 |
* race. This is slow when there are a lot of nodes, but we don't |
355 |
* expect lists to be long enough to outweigh higher-overhead |
356 |
* schemes. |
357 |
*/ |
358 |
private void removeWaiter(WaitNode node) { |
359 |
if (node != null) { |
360 |
node.thread = null; |
361 |
retry: |
362 |
for (;;) { // restart on removeWaiter race |
363 |
for (WaitNode pred = null, q = waiters, s; q != null; q = s) { |
364 |
s = q.next; |
365 |
if (q.thread != null) |
366 |
pred = q; |
367 |
else if (pred != null) { |
368 |
pred.next = s; |
369 |
if (pred.thread == null) // check for race |
370 |
continue retry; |
371 |
} |
372 |
else if (!UNSAFE.compareAndSwapObject(this, WAITERS, q, s)) |
373 |
continue retry; |
374 |
} |
375 |
break; |
376 |
} |
377 |
} |
378 |
} |
379 |
|
380 |
/* ------------- Async tasks -------------- */ |
381 |
|
382 |
/** |
383 |
* A marker interface identifying asynchronous tasks produced by |
384 |
* {@code async} methods. This may be useful for monitoring, |
385 |
* debugging, and tracking asynchronous activities. |
386 |
*/ |
387 |
public static interface AsynchronousCompletionTask { |
388 |
} |
389 |
|
390 |
/** Base class can act as either FJ or plain Runnable */ |
391 |
abstract static class Async extends ForkJoinTask<Void> |
392 |
implements Runnable, AsynchronousCompletionTask { |
393 |
public final Void getRawResult() { return null; } |
394 |
public final void setRawResult(Void v) { } |
395 |
public final void run() { exec(); } |
396 |
} |
397 |
|
398 |
static final class AsyncRun extends Async { |
399 |
final Runnable fn; |
400 |
final CompletableFuture<Void> dst; |
401 |
AsyncRun(Runnable fn, CompletableFuture<Void> dst) { |
402 |
this.fn = fn; this.dst = dst; |
403 |
} |
404 |
public final boolean exec() { |
405 |
CompletableFuture<Void> d; Throwable ex; |
406 |
if ((d = this.dst) != null && d.result == null) { |
407 |
try { |
408 |
fn.run(); |
409 |
ex = null; |
410 |
} catch (Throwable rex) { |
411 |
ex = rex; |
412 |
} |
413 |
d.internalComplete(null, ex); |
414 |
} |
415 |
return true; |
416 |
} |
417 |
private static final long serialVersionUID = 5232453952276885070L; |
418 |
} |
419 |
|
420 |
static final class AsyncSupply<U> extends Async { |
421 |
final Generator<U> fn; |
422 |
final CompletableFuture<U> dst; |
423 |
AsyncSupply(Generator<U> fn, CompletableFuture<U> dst) { |
424 |
this.fn = fn; this.dst = dst; |
425 |
} |
426 |
public final boolean exec() { |
427 |
CompletableFuture<U> d; U u; Throwable ex; |
428 |
if ((d = this.dst) != null && d.result == null) { |
429 |
try { |
430 |
u = fn.get(); |
431 |
ex = null; |
432 |
} catch (Throwable rex) { |
433 |
ex = rex; |
434 |
u = null; |
435 |
} |
436 |
d.internalComplete(u, ex); |
437 |
} |
438 |
return true; |
439 |
} |
440 |
private static final long serialVersionUID = 5232453952276885070L; |
441 |
} |
442 |
|
443 |
static final class AsyncApply<T,U> extends Async { |
444 |
final Fun<? super T,? extends U> fn; |
445 |
final T arg; |
446 |
final CompletableFuture<U> dst; |
447 |
AsyncApply(T arg, Fun<? super T,? extends U> fn, |
448 |
CompletableFuture<U> dst) { |
449 |
this.arg = arg; this.fn = fn; this.dst = dst; |
450 |
} |
451 |
public final boolean exec() { |
452 |
CompletableFuture<U> d; U u; Throwable ex; |
453 |
if ((d = this.dst) != null && d.result == null) { |
454 |
try { |
455 |
u = fn.apply(arg); |
456 |
ex = null; |
457 |
} catch (Throwable rex) { |
458 |
ex = rex; |
459 |
u = null; |
460 |
} |
461 |
d.internalComplete(u, ex); |
462 |
} |
463 |
return true; |
464 |
} |
465 |
private static final long serialVersionUID = 5232453952276885070L; |
466 |
} |
467 |
|
468 |
static final class AsyncBiApply<T,U,V> extends Async { |
469 |
final BiFun<? super T,? super U,? extends V> fn; |
470 |
final T arg1; |
471 |
final U arg2; |
472 |
final CompletableFuture<V> dst; |
473 |
AsyncBiApply(T arg1, U arg2, |
474 |
BiFun<? super T,? super U,? extends V> fn, |
475 |
CompletableFuture<V> dst) { |
476 |
this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; this.dst = dst; |
477 |
} |
478 |
public final boolean exec() { |
479 |
CompletableFuture<V> d; V v; Throwable ex; |
480 |
if ((d = this.dst) != null && d.result == null) { |
481 |
try { |
482 |
v = fn.apply(arg1, arg2); |
483 |
ex = null; |
484 |
} catch (Throwable rex) { |
485 |
ex = rex; |
486 |
v = null; |
487 |
} |
488 |
d.internalComplete(v, ex); |
489 |
} |
490 |
return true; |
491 |
} |
492 |
private static final long serialVersionUID = 5232453952276885070L; |
493 |
} |
494 |
|
495 |
static final class AsyncAccept<T> extends Async { |
496 |
final Action<? super T> fn; |
497 |
final T arg; |
498 |
final CompletableFuture<Void> dst; |
499 |
AsyncAccept(T arg, Action<? super T> fn, |
500 |
CompletableFuture<Void> dst) { |
501 |
this.arg = arg; this.fn = fn; this.dst = dst; |
502 |
} |
503 |
public final boolean exec() { |
504 |
CompletableFuture<Void> d; Throwable ex; |
505 |
if ((d = this.dst) != null && d.result == null) { |
506 |
try { |
507 |
fn.accept(arg); |
508 |
ex = null; |
509 |
} catch (Throwable rex) { |
510 |
ex = rex; |
511 |
} |
512 |
d.internalComplete(null, ex); |
513 |
} |
514 |
return true; |
515 |
} |
516 |
private static final long serialVersionUID = 5232453952276885070L; |
517 |
} |
518 |
|
519 |
static final class AsyncBiAccept<T,U> extends Async { |
520 |
final BiAction<? super T,? super U> fn; |
521 |
final T arg1; |
522 |
final U arg2; |
523 |
final CompletableFuture<Void> dst; |
524 |
AsyncBiAccept(T arg1, U arg2, |
525 |
BiAction<? super T,? super U> fn, |
526 |
CompletableFuture<Void> dst) { |
527 |
this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; this.dst = dst; |
528 |
} |
529 |
public final boolean exec() { |
530 |
CompletableFuture<Void> d; Throwable ex; |
531 |
if ((d = this.dst) != null && d.result == null) { |
532 |
try { |
533 |
fn.accept(arg1, arg2); |
534 |
ex = null; |
535 |
} catch (Throwable rex) { |
536 |
ex = rex; |
537 |
} |
538 |
d.internalComplete(null, ex); |
539 |
} |
540 |
return true; |
541 |
} |
542 |
private static final long serialVersionUID = 5232453952276885070L; |
543 |
} |
544 |
|
545 |
/* ------------- Completions -------------- */ |
546 |
|
547 |
/** |
548 |
* Simple linked list nodes to record completions, used in |
549 |
* basically the same way as WaitNodes. (We separate nodes from |
550 |
* the Completions themselves mainly because for the And and Or |
551 |
* methods, the same Completion object resides in two lists.) |
552 |
*/ |
553 |
static final class CompletionNode { |
554 |
final Completion completion; |
555 |
volatile CompletionNode next; |
556 |
CompletionNode(Completion completion) { this.completion = completion; } |
557 |
} |
558 |
|
559 |
// Opportunistically subclass AtomicInteger to use compareAndSet to claim. |
560 |
abstract static class Completion extends AtomicInteger implements Runnable { |
561 |
} |
562 |
|
563 |
static final class ApplyCompletion<T,U> extends Completion { |
564 |
final CompletableFuture<? extends T> src; |
565 |
final Fun<? super T,? extends U> fn; |
566 |
final CompletableFuture<U> dst; |
567 |
final Executor executor; |
568 |
ApplyCompletion(CompletableFuture<? extends T> src, |
569 |
Fun<? super T,? extends U> fn, |
570 |
CompletableFuture<U> dst, Executor executor) { |
571 |
this.src = src; this.fn = fn; this.dst = dst; |
572 |
this.executor = executor; |
573 |
} |
574 |
public final void run() { |
575 |
final CompletableFuture<? extends T> a; |
576 |
final Fun<? super T,? extends U> fn; |
577 |
final CompletableFuture<U> dst; |
578 |
Object r; T t; Throwable ex; |
579 |
if ((dst = this.dst) != null && |
580 |
(fn = this.fn) != null && |
581 |
(a = this.src) != null && |
582 |
(r = a.result) != null && |
583 |
compareAndSet(0, 1)) { |
584 |
if (r instanceof AltResult) { |
585 |
ex = ((AltResult)r).ex; |
586 |
t = null; |
587 |
} |
588 |
else { |
589 |
ex = null; |
590 |
@SuppressWarnings("unchecked") T tr = (T) r; |
591 |
t = tr; |
592 |
} |
593 |
Executor e = executor; |
594 |
U u = null; |
595 |
if (ex == null) { |
596 |
try { |
597 |
if (e != null) |
598 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
599 |
else |
600 |
u = fn.apply(t); |
601 |
} catch (Throwable rex) { |
602 |
ex = rex; |
603 |
} |
604 |
} |
605 |
if (e == null || ex != null) |
606 |
dst.internalComplete(u, ex); |
607 |
} |
608 |
} |
609 |
private static final long serialVersionUID = 5232453952276885070L; |
610 |
} |
611 |
|
612 |
static final class AcceptCompletion<T> extends Completion { |
613 |
final CompletableFuture<? extends T> src; |
614 |
final Action<? super T> fn; |
615 |
final CompletableFuture<Void> dst; |
616 |
final Executor executor; |
617 |
AcceptCompletion(CompletableFuture<? extends T> src, |
618 |
Action<? super T> fn, |
619 |
CompletableFuture<Void> dst, Executor executor) { |
620 |
this.src = src; this.fn = fn; this.dst = dst; |
621 |
this.executor = executor; |
622 |
} |
623 |
public final void run() { |
624 |
final CompletableFuture<? extends T> a; |
625 |
final Action<? super T> fn; |
626 |
final CompletableFuture<Void> dst; |
627 |
Object r; T t; Throwable ex; |
628 |
if ((dst = this.dst) != null && |
629 |
(fn = this.fn) != null && |
630 |
(a = this.src) != null && |
631 |
(r = a.result) != null && |
632 |
compareAndSet(0, 1)) { |
633 |
if (r instanceof AltResult) { |
634 |
ex = ((AltResult)r).ex; |
635 |
t = null; |
636 |
} |
637 |
else { |
638 |
ex = null; |
639 |
@SuppressWarnings("unchecked") T tr = (T) r; |
640 |
t = tr; |
641 |
} |
642 |
Executor e = executor; |
643 |
if (ex == null) { |
644 |
try { |
645 |
if (e != null) |
646 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
647 |
else |
648 |
fn.accept(t); |
649 |
} catch (Throwable rex) { |
650 |
ex = rex; |
651 |
} |
652 |
} |
653 |
if (e == null || ex != null) |
654 |
dst.internalComplete(null, ex); |
655 |
} |
656 |
} |
657 |
private static final long serialVersionUID = 5232453952276885070L; |
658 |
} |
659 |
|
660 |
static final class RunCompletion<T> extends Completion { |
661 |
final CompletableFuture<? extends T> src; |
662 |
final Runnable fn; |
663 |
final CompletableFuture<Void> dst; |
664 |
final Executor executor; |
665 |
RunCompletion(CompletableFuture<? extends T> src, |
666 |
Runnable fn, |
667 |
CompletableFuture<Void> dst, |
668 |
Executor executor) { |
669 |
this.src = src; this.fn = fn; this.dst = dst; |
670 |
this.executor = executor; |
671 |
} |
672 |
public final void run() { |
673 |
final CompletableFuture<? extends T> a; |
674 |
final Runnable fn; |
675 |
final CompletableFuture<Void> dst; |
676 |
Object r; Throwable ex; |
677 |
if ((dst = this.dst) != null && |
678 |
(fn = this.fn) != null && |
679 |
(a = this.src) != null && |
680 |
(r = a.result) != null && |
681 |
compareAndSet(0, 1)) { |
682 |
if (r instanceof AltResult) |
683 |
ex = ((AltResult)r).ex; |
684 |
else |
685 |
ex = null; |
686 |
Executor e = executor; |
687 |
if (ex == null) { |
688 |
try { |
689 |
if (e != null) |
690 |
e.execute(new AsyncRun(fn, dst)); |
691 |
else |
692 |
fn.run(); |
693 |
} catch (Throwable rex) { |
694 |
ex = rex; |
695 |
} |
696 |
} |
697 |
if (e == null || ex != null) |
698 |
dst.internalComplete(null, ex); |
699 |
} |
700 |
} |
701 |
private static final long serialVersionUID = 5232453952276885070L; |
702 |
} |
703 |
|
704 |
static final class BiApplyCompletion<T,U,V> extends Completion { |
705 |
final CompletableFuture<? extends T> src; |
706 |
final CompletableFuture<? extends U> snd; |
707 |
final BiFun<? super T,? super U,? extends V> fn; |
708 |
final CompletableFuture<V> dst; |
709 |
final Executor executor; |
710 |
BiApplyCompletion(CompletableFuture<? extends T> src, |
711 |
CompletableFuture<? extends U> snd, |
712 |
BiFun<? super T,? super U,? extends V> fn, |
713 |
CompletableFuture<V> dst, Executor executor) { |
714 |
this.src = src; this.snd = snd; |
715 |
this.fn = fn; this.dst = dst; |
716 |
this.executor = executor; |
717 |
} |
718 |
public final void run() { |
719 |
final CompletableFuture<? extends T> a; |
720 |
final CompletableFuture<? extends U> b; |
721 |
final BiFun<? super T,? super U,? extends V> fn; |
722 |
final CompletableFuture<V> dst; |
723 |
Object r, s; T t; U u; Throwable ex; |
724 |
if ((dst = this.dst) != null && |
725 |
(fn = this.fn) != null && |
726 |
(a = this.src) != null && |
727 |
(r = a.result) != null && |
728 |
(b = this.snd) != null && |
729 |
(s = b.result) != null && |
730 |
compareAndSet(0, 1)) { |
731 |
if (r instanceof AltResult) { |
732 |
ex = ((AltResult)r).ex; |
733 |
t = null; |
734 |
} |
735 |
else { |
736 |
ex = null; |
737 |
@SuppressWarnings("unchecked") T tr = (T) r; |
738 |
t = tr; |
739 |
} |
740 |
if (ex != null) |
741 |
u = null; |
742 |
else if (s instanceof AltResult) { |
743 |
ex = ((AltResult)s).ex; |
744 |
u = null; |
745 |
} |
746 |
else { |
747 |
@SuppressWarnings("unchecked") U us = (U) s; |
748 |
u = us; |
749 |
} |
750 |
Executor e = executor; |
751 |
V v = null; |
752 |
if (ex == null) { |
753 |
try { |
754 |
if (e != null) |
755 |
e.execute(new AsyncBiApply<T,U,V>(t, u, fn, dst)); |
756 |
else |
757 |
v = fn.apply(t, u); |
758 |
} catch (Throwable rex) { |
759 |
ex = rex; |
760 |
} |
761 |
} |
762 |
if (e == null || ex != null) |
763 |
dst.internalComplete(v, ex); |
764 |
} |
765 |
} |
766 |
private static final long serialVersionUID = 5232453952276885070L; |
767 |
} |
768 |
|
769 |
static final class BiAcceptCompletion<T,U> extends Completion { |
770 |
final CompletableFuture<? extends T> src; |
771 |
final CompletableFuture<? extends U> snd; |
772 |
final BiAction<? super T,? super U> fn; |
773 |
final CompletableFuture<Void> dst; |
774 |
final Executor executor; |
775 |
BiAcceptCompletion(CompletableFuture<? extends T> src, |
776 |
CompletableFuture<? extends U> snd, |
777 |
BiAction<? super T,? super U> fn, |
778 |
CompletableFuture<Void> dst, Executor executor) { |
779 |
this.src = src; this.snd = snd; |
780 |
this.fn = fn; this.dst = dst; |
781 |
this.executor = executor; |
782 |
} |
783 |
public final void run() { |
784 |
final CompletableFuture<? extends T> a; |
785 |
final CompletableFuture<? extends U> b; |
786 |
final BiAction<? super T,? super U> fn; |
787 |
final CompletableFuture<Void> dst; |
788 |
Object r, s; T t; U u; Throwable ex; |
789 |
if ((dst = this.dst) != null && |
790 |
(fn = this.fn) != null && |
791 |
(a = this.src) != null && |
792 |
(r = a.result) != null && |
793 |
(b = this.snd) != null && |
794 |
(s = b.result) != null && |
795 |
compareAndSet(0, 1)) { |
796 |
if (r instanceof AltResult) { |
797 |
ex = ((AltResult)r).ex; |
798 |
t = null; |
799 |
} |
800 |
else { |
801 |
ex = null; |
802 |
@SuppressWarnings("unchecked") T tr = (T) r; |
803 |
t = tr; |
804 |
} |
805 |
if (ex != null) |
806 |
u = null; |
807 |
else if (s instanceof AltResult) { |
808 |
ex = ((AltResult)s).ex; |
809 |
u = null; |
810 |
} |
811 |
else { |
812 |
@SuppressWarnings("unchecked") U us = (U) s; |
813 |
u = us; |
814 |
} |
815 |
Executor e = executor; |
816 |
if (ex == null) { |
817 |
try { |
818 |
if (e != null) |
819 |
e.execute(new AsyncBiAccept<T,U>(t, u, fn, dst)); |
820 |
else |
821 |
fn.accept(t, u); |
822 |
} catch (Throwable rex) { |
823 |
ex = rex; |
824 |
} |
825 |
} |
826 |
if (e == null || ex != null) |
827 |
dst.internalComplete(null, ex); |
828 |
} |
829 |
} |
830 |
private static final long serialVersionUID = 5232453952276885070L; |
831 |
} |
832 |
|
833 |
static final class BiRunCompletion<T> extends Completion { |
834 |
final CompletableFuture<? extends T> src; |
835 |
final CompletableFuture<?> snd; |
836 |
final Runnable fn; |
837 |
final CompletableFuture<Void> dst; |
838 |
final Executor executor; |
839 |
BiRunCompletion(CompletableFuture<? extends T> src, |
840 |
CompletableFuture<?> snd, |
841 |
Runnable fn, |
842 |
CompletableFuture<Void> dst, Executor executor) { |
843 |
this.src = src; this.snd = snd; |
844 |
this.fn = fn; this.dst = dst; |
845 |
this.executor = executor; |
846 |
} |
847 |
public final void run() { |
848 |
final CompletableFuture<? extends T> a; |
849 |
final CompletableFuture<?> b; |
850 |
final Runnable fn; |
851 |
final CompletableFuture<Void> dst; |
852 |
Object r, s; Throwable ex; |
853 |
if ((dst = this.dst) != null && |
854 |
(fn = this.fn) != null && |
855 |
(a = this.src) != null && |
856 |
(r = a.result) != null && |
857 |
(b = this.snd) != null && |
858 |
(s = b.result) != null && |
859 |
compareAndSet(0, 1)) { |
860 |
if (r instanceof AltResult) |
861 |
ex = ((AltResult)r).ex; |
862 |
else |
863 |
ex = null; |
864 |
if (ex == null && (s instanceof AltResult)) |
865 |
ex = ((AltResult)s).ex; |
866 |
Executor e = executor; |
867 |
if (ex == null) { |
868 |
try { |
869 |
if (e != null) |
870 |
e.execute(new AsyncRun(fn, dst)); |
871 |
else |
872 |
fn.run(); |
873 |
} catch (Throwable rex) { |
874 |
ex = rex; |
875 |
} |
876 |
} |
877 |
if (e == null || ex != null) |
878 |
dst.internalComplete(null, ex); |
879 |
} |
880 |
} |
881 |
private static final long serialVersionUID = 5232453952276885070L; |
882 |
} |
883 |
|
884 |
static final class OrApplyCompletion<T,U> extends Completion { |
885 |
final CompletableFuture<? extends T> src; |
886 |
final CompletableFuture<? extends T> snd; |
887 |
final Fun<? super T,? extends U> fn; |
888 |
final CompletableFuture<U> dst; |
889 |
final Executor executor; |
890 |
OrApplyCompletion(CompletableFuture<? extends T> src, |
891 |
CompletableFuture<? extends T> snd, |
892 |
Fun<? super T,? extends U> fn, |
893 |
CompletableFuture<U> dst, Executor executor) { |
894 |
this.src = src; this.snd = snd; |
895 |
this.fn = fn; this.dst = dst; |
896 |
this.executor = executor; |
897 |
} |
898 |
public final void run() { |
899 |
final CompletableFuture<? extends T> a; |
900 |
final CompletableFuture<? extends T> b; |
901 |
final Fun<? super T,? extends U> fn; |
902 |
final CompletableFuture<U> dst; |
903 |
Object r; T t; Throwable ex; |
904 |
if ((dst = this.dst) != null && |
905 |
(fn = this.fn) != null && |
906 |
(((a = this.src) != null && (r = a.result) != null) || |
907 |
((b = this.snd) != null && (r = b.result) != null)) && |
908 |
compareAndSet(0, 1)) { |
909 |
if (r instanceof AltResult) { |
910 |
ex = ((AltResult)r).ex; |
911 |
t = null; |
912 |
} |
913 |
else { |
914 |
ex = null; |
915 |
@SuppressWarnings("unchecked") T tr = (T) r; |
916 |
t = tr; |
917 |
} |
918 |
Executor e = executor; |
919 |
U u = null; |
920 |
if (ex == null) { |
921 |
try { |
922 |
if (e != null) |
923 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
924 |
else |
925 |
u = fn.apply(t); |
926 |
} catch (Throwable rex) { |
927 |
ex = rex; |
928 |
} |
929 |
} |
930 |
if (e == null || ex != null) |
931 |
dst.internalComplete(u, ex); |
932 |
} |
933 |
} |
934 |
private static final long serialVersionUID = 5232453952276885070L; |
935 |
} |
936 |
|
937 |
static final class OrAcceptCompletion<T> extends Completion { |
938 |
final CompletableFuture<? extends T> src; |
939 |
final CompletableFuture<? extends T> snd; |
940 |
final Action<? super T> fn; |
941 |
final CompletableFuture<Void> dst; |
942 |
final Executor executor; |
943 |
OrAcceptCompletion(CompletableFuture<? extends T> src, |
944 |
CompletableFuture<? extends T> snd, |
945 |
Action<? super T> fn, |
946 |
CompletableFuture<Void> dst, Executor executor) { |
947 |
this.src = src; this.snd = snd; |
948 |
this.fn = fn; this.dst = dst; |
949 |
this.executor = executor; |
950 |
} |
951 |
public final void run() { |
952 |
final CompletableFuture<? extends T> a; |
953 |
final CompletableFuture<? extends T> b; |
954 |
final Action<? super T> fn; |
955 |
final CompletableFuture<Void> dst; |
956 |
Object r; T t; Throwable ex; |
957 |
if ((dst = this.dst) != null && |
958 |
(fn = this.fn) != null && |
959 |
(((a = this.src) != null && (r = a.result) != null) || |
960 |
((b = this.snd) != null && (r = b.result) != null)) && |
961 |
compareAndSet(0, 1)) { |
962 |
if (r instanceof AltResult) { |
963 |
ex = ((AltResult)r).ex; |
964 |
t = null; |
965 |
} |
966 |
else { |
967 |
ex = null; |
968 |
@SuppressWarnings("unchecked") T tr = (T) r; |
969 |
t = tr; |
970 |
} |
971 |
Executor e = executor; |
972 |
if (ex == null) { |
973 |
try { |
974 |
if (e != null) |
975 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
976 |
else |
977 |
fn.accept(t); |
978 |
} catch (Throwable rex) { |
979 |
ex = rex; |
980 |
} |
981 |
} |
982 |
if (e == null || ex != null) |
983 |
dst.internalComplete(null, ex); |
984 |
} |
985 |
} |
986 |
private static final long serialVersionUID = 5232453952276885070L; |
987 |
} |
988 |
|
989 |
static final class OrRunCompletion<T> extends Completion { |
990 |
final CompletableFuture<? extends T> src; |
991 |
final CompletableFuture<?> snd; |
992 |
final Runnable fn; |
993 |
final CompletableFuture<Void> dst; |
994 |
final Executor executor; |
995 |
OrRunCompletion(CompletableFuture<? extends T> src, |
996 |
CompletableFuture<?> snd, |
997 |
Runnable fn, |
998 |
CompletableFuture<Void> dst, Executor executor) { |
999 |
this.src = src; this.snd = snd; |
1000 |
this.fn = fn; this.dst = dst; |
1001 |
this.executor = executor; |
1002 |
} |
1003 |
public final void run() { |
1004 |
final CompletableFuture<? extends T> a; |
1005 |
final CompletableFuture<?> b; |
1006 |
final Runnable fn; |
1007 |
final CompletableFuture<Void> dst; |
1008 |
Object r; Throwable ex; |
1009 |
if ((dst = this.dst) != null && |
1010 |
(fn = this.fn) != null && |
1011 |
(((a = this.src) != null && (r = a.result) != null) || |
1012 |
((b = this.snd) != null && (r = b.result) != null)) && |
1013 |
compareAndSet(0, 1)) { |
1014 |
if (r instanceof AltResult) |
1015 |
ex = ((AltResult)r).ex; |
1016 |
else |
1017 |
ex = null; |
1018 |
Executor e = executor; |
1019 |
if (ex == null) { |
1020 |
try { |
1021 |
if (e != null) |
1022 |
e.execute(new AsyncRun(fn, dst)); |
1023 |
else |
1024 |
fn.run(); |
1025 |
} catch (Throwable rex) { |
1026 |
ex = rex; |
1027 |
} |
1028 |
} |
1029 |
if (e == null || ex != null) |
1030 |
dst.internalComplete(null, ex); |
1031 |
} |
1032 |
} |
1033 |
private static final long serialVersionUID = 5232453952276885070L; |
1034 |
} |
1035 |
|
1036 |
static final class ExceptionCompletion<T> extends Completion { |
1037 |
final CompletableFuture<? extends T> src; |
1038 |
final Fun<? super Throwable, ? extends T> fn; |
1039 |
final CompletableFuture<T> dst; |
1040 |
ExceptionCompletion(CompletableFuture<? extends T> src, |
1041 |
Fun<? super Throwable, ? extends T> fn, |
1042 |
CompletableFuture<T> dst) { |
1043 |
this.src = src; this.fn = fn; this.dst = dst; |
1044 |
} |
1045 |
public final void run() { |
1046 |
final CompletableFuture<? extends T> a; |
1047 |
final Fun<? super Throwable, ? extends T> fn; |
1048 |
final CompletableFuture<T> dst; |
1049 |
Object r; T t = null; Throwable ex, dx = null; |
1050 |
if ((dst = this.dst) != null && |
1051 |
(fn = this.fn) != null && |
1052 |
(a = this.src) != null && |
1053 |
(r = a.result) != null && |
1054 |
compareAndSet(0, 1)) { |
1055 |
if ((r instanceof AltResult) && |
1056 |
(ex = ((AltResult)r).ex) != null) { |
1057 |
try { |
1058 |
t = fn.apply(ex); |
1059 |
} catch (Throwable rex) { |
1060 |
dx = rex; |
1061 |
} |
1062 |
} |
1063 |
else { |
1064 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1065 |
t = tr; |
1066 |
} |
1067 |
dst.internalComplete(t, dx); |
1068 |
} |
1069 |
} |
1070 |
private static final long serialVersionUID = 5232453952276885070L; |
1071 |
} |
1072 |
|
1073 |
static final class ThenCopy<T> extends Completion { |
1074 |
final CompletableFuture<? extends T> src; |
1075 |
final CompletableFuture<T> dst; |
1076 |
ThenCopy(CompletableFuture<? extends T> src, |
1077 |
CompletableFuture<T> dst) { |
1078 |
this.src = src; this.dst = dst; |
1079 |
} |
1080 |
public final void run() { |
1081 |
final CompletableFuture<? extends T> a; |
1082 |
final CompletableFuture<T> dst; |
1083 |
Object r; Object t; Throwable ex; |
1084 |
if ((dst = this.dst) != null && |
1085 |
(a = this.src) != null && |
1086 |
(r = a.result) != null && |
1087 |
compareAndSet(0, 1)) { |
1088 |
if (r instanceof AltResult) { |
1089 |
ex = ((AltResult)r).ex; |
1090 |
t = null; |
1091 |
} |
1092 |
else { |
1093 |
ex = null; |
1094 |
t = r; |
1095 |
} |
1096 |
dst.internalComplete(t, ex); |
1097 |
} |
1098 |
} |
1099 |
private static final long serialVersionUID = 5232453952276885070L; |
1100 |
} |
1101 |
|
1102 |
static final class HandleCompletion<T,U> extends Completion { |
1103 |
final CompletableFuture<? extends T> src; |
1104 |
final BiFun<? super T, Throwable, ? extends U> fn; |
1105 |
final CompletableFuture<U> dst; |
1106 |
HandleCompletion(CompletableFuture<? extends T> src, |
1107 |
BiFun<? super T, Throwable, ? extends U> fn, |
1108 |
final CompletableFuture<U> dst) { |
1109 |
this.src = src; this.fn = fn; this.dst = dst; |
1110 |
} |
1111 |
public final void run() { |
1112 |
final CompletableFuture<? extends T> a; |
1113 |
final BiFun<? super T, Throwable, ? extends U> fn; |
1114 |
final CompletableFuture<U> dst; |
1115 |
Object r; T t; Throwable ex; |
1116 |
if ((dst = this.dst) != null && |
1117 |
(fn = this.fn) != null && |
1118 |
(a = this.src) != null && |
1119 |
(r = a.result) != null && |
1120 |
compareAndSet(0, 1)) { |
1121 |
if (r instanceof AltResult) { |
1122 |
ex = ((AltResult)r).ex; |
1123 |
t = null; |
1124 |
} |
1125 |
else { |
1126 |
ex = null; |
1127 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1128 |
t = tr; |
1129 |
} |
1130 |
U u = null; Throwable dx = null; |
1131 |
try { |
1132 |
u = fn.apply(t, ex); |
1133 |
} catch (Throwable rex) { |
1134 |
dx = rex; |
1135 |
} |
1136 |
dst.internalComplete(u, dx); |
1137 |
} |
1138 |
} |
1139 |
private static final long serialVersionUID = 5232453952276885070L; |
1140 |
} |
1141 |
|
1142 |
static final class ComposeCompletion<T,U> extends Completion { |
1143 |
final CompletableFuture<? extends T> src; |
1144 |
final Fun<? super T, CompletableFuture<U>> fn; |
1145 |
final CompletableFuture<U> dst; |
1146 |
ComposeCompletion(CompletableFuture<? extends T> src, |
1147 |
Fun<? super T, CompletableFuture<U>> fn, |
1148 |
final CompletableFuture<U> dst) { |
1149 |
this.src = src; this.fn = fn; this.dst = dst; |
1150 |
} |
1151 |
public final void run() { |
1152 |
final CompletableFuture<? extends T> a; |
1153 |
final Fun<? super T, CompletableFuture<U>> fn; |
1154 |
final CompletableFuture<U> dst; |
1155 |
Object r; T t; Throwable ex; |
1156 |
if ((dst = this.dst) != null && |
1157 |
(fn = this.fn) != null && |
1158 |
(a = this.src) != null && |
1159 |
(r = a.result) != null && |
1160 |
compareAndSet(0, 1)) { |
1161 |
if (r instanceof AltResult) { |
1162 |
ex = ((AltResult)r).ex; |
1163 |
t = null; |
1164 |
} |
1165 |
else { |
1166 |
ex = null; |
1167 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1168 |
t = tr; |
1169 |
} |
1170 |
CompletableFuture<U> c = null; |
1171 |
U u = null; |
1172 |
boolean complete = false; |
1173 |
if (ex == null) { |
1174 |
try { |
1175 |
c = fn.apply(t); |
1176 |
} catch (Throwable rex) { |
1177 |
ex = rex; |
1178 |
} |
1179 |
} |
1180 |
if (ex != null || c == null) { |
1181 |
if (ex == null) |
1182 |
ex = new NullPointerException(); |
1183 |
} |
1184 |
else { |
1185 |
ThenCopy<U> d = null; |
1186 |
Object s; |
1187 |
if ((s = c.result) == null) { |
1188 |
CompletionNode p = new CompletionNode |
1189 |
(d = new ThenCopy<U>(c, dst)); |
1190 |
while ((s = c.result) == null) { |
1191 |
if (UNSAFE.compareAndSwapObject |
1192 |
(c, COMPLETIONS, p.next = c.completions, p)) |
1193 |
break; |
1194 |
} |
1195 |
} |
1196 |
if (s != null && (d == null || d.compareAndSet(0, 1))) { |
1197 |
complete = true; |
1198 |
if (s instanceof AltResult) { |
1199 |
ex = ((AltResult)s).ex; // no rewrap |
1200 |
u = null; |
1201 |
} |
1202 |
else { |
1203 |
@SuppressWarnings("unchecked") U us = (U) s; |
1204 |
u = us; |
1205 |
} |
1206 |
} |
1207 |
} |
1208 |
if (complete || ex != null) |
1209 |
dst.internalComplete(u, ex); |
1210 |
if (c != null) |
1211 |
c.helpPostComplete(); |
1212 |
} |
1213 |
} |
1214 |
private static final long serialVersionUID = 5232453952276885070L; |
1215 |
} |
1216 |
|
1217 |
// public methods |
1218 |
|
1219 |
/** |
1220 |
* Creates a new incomplete CompletableFuture. |
1221 |
*/ |
1222 |
public CompletableFuture() { |
1223 |
} |
1224 |
|
1225 |
/** |
1226 |
* Asynchronously executes in the {@link |
1227 |
* ForkJoinPool#commonPool()}, a task that completes the returned |
1228 |
* CompletableFuture with the result of the given Supplier. |
1229 |
* |
1230 |
* @param supplier a function returning the value to be used |
1231 |
* to complete the returned CompletableFuture |
1232 |
* @return the CompletableFuture |
1233 |
*/ |
1234 |
public static <U> CompletableFuture<U> supplyAsync(Generator<U> supplier) { |
1235 |
if (supplier == null) throw new NullPointerException(); |
1236 |
CompletableFuture<U> f = new CompletableFuture<U>(); |
1237 |
ForkJoinPool.commonPool(). |
1238 |
execute((ForkJoinTask<?>)new AsyncSupply<U>(supplier, f)); |
1239 |
return f; |
1240 |
} |
1241 |
|
1242 |
/** |
1243 |
* Asynchronously executes using the given executor, a task that |
1244 |
* completes the returned CompletableFuture with the result of the |
1245 |
* given Supplier. |
1246 |
* |
1247 |
* @param supplier a function returning the value to be used |
1248 |
* to complete the returned CompletableFuture |
1249 |
* @param executor the executor to use for asynchronous execution |
1250 |
* @return the CompletableFuture |
1251 |
*/ |
1252 |
public static <U> CompletableFuture<U> supplyAsync(Generator<U> supplier, |
1253 |
Executor executor) { |
1254 |
if (executor == null || supplier == null) |
1255 |
throw new NullPointerException(); |
1256 |
CompletableFuture<U> f = new CompletableFuture<U>(); |
1257 |
executor.execute(new AsyncSupply<U>(supplier, f)); |
1258 |
return f; |
1259 |
} |
1260 |
|
1261 |
/** |
1262 |
* Asynchronously executes in the {@link |
1263 |
* ForkJoinPool#commonPool()} a task that runs the given action, |
1264 |
* and then completes the returned CompletableFuture. |
1265 |
* |
1266 |
* @param runnable the action to run before completing the |
1267 |
* returned CompletableFuture |
1268 |
* @return the CompletableFuture |
1269 |
*/ |
1270 |
public static CompletableFuture<Void> runAsync(Runnable runnable) { |
1271 |
if (runnable == null) throw new NullPointerException(); |
1272 |
CompletableFuture<Void> f = new CompletableFuture<Void>(); |
1273 |
ForkJoinPool.commonPool(). |
1274 |
execute((ForkJoinTask<?>)new AsyncRun(runnable, f)); |
1275 |
return f; |
1276 |
} |
1277 |
|
1278 |
/** |
1279 |
* Asynchronously executes using the given executor, a task that |
1280 |
* runs the given action, and then completes the returned |
1281 |
* CompletableFuture. |
1282 |
* |
1283 |
* @param runnable the action to run before completing the |
1284 |
* returned CompletableFuture |
1285 |
* @param executor the executor to use for asynchronous execution |
1286 |
* @return the CompletableFuture |
1287 |
*/ |
1288 |
public static CompletableFuture<Void> runAsync(Runnable runnable, |
1289 |
Executor executor) { |
1290 |
if (executor == null || runnable == null) |
1291 |
throw new NullPointerException(); |
1292 |
CompletableFuture<Void> f = new CompletableFuture<Void>(); |
1293 |
executor.execute(new AsyncRun(runnable, f)); |
1294 |
return f; |
1295 |
} |
1296 |
|
1297 |
/** |
1298 |
* Returns {@code true} if completed in any fashion: normally, |
1299 |
* exceptionally, or via cancellation. |
1300 |
* |
1301 |
* @return {@code true} if completed |
1302 |
*/ |
1303 |
public boolean isDone() { |
1304 |
return result != null; |
1305 |
} |
1306 |
|
1307 |
/** |
1308 |
* Waits if necessary for the computation to complete, and then |
1309 |
* retrieves its result. |
1310 |
* |
1311 |
* @return the computed result |
1312 |
* @throws CancellationException if the computation was cancelled |
1313 |
* @throws ExecutionException if the computation threw an |
1314 |
* exception |
1315 |
* @throws InterruptedException if the current thread was interrupted |
1316 |
* while waiting |
1317 |
*/ |
1318 |
public T get() throws InterruptedException, ExecutionException { |
1319 |
Object r; Throwable ex, cause; |
1320 |
if ((r = result) == null && (r = waitingGet(true)) == null) |
1321 |
throw new InterruptedException(); |
1322 |
if (!(r instanceof AltResult)) { |
1323 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1324 |
return tr; |
1325 |
} |
1326 |
if ((ex = ((AltResult)r).ex) == null) |
1327 |
return null; |
1328 |
if (ex instanceof CancellationException) |
1329 |
throw (CancellationException)ex; |
1330 |
if ((ex instanceof CompletionException) && |
1331 |
(cause = ex.getCause()) != null) |
1332 |
ex = cause; |
1333 |
throw new ExecutionException(ex); |
1334 |
} |
1335 |
|
1336 |
/** |
1337 |
* Waits if necessary for at most the given time for completion, |
1338 |
* and then retrieves its result, if available. |
1339 |
* |
1340 |
* @param timeout the maximum time to wait |
1341 |
* @param unit the time unit of the timeout argument |
1342 |
* @return the computed result |
1343 |
* @throws CancellationException if the computation was cancelled |
1344 |
* @throws ExecutionException if the computation threw an |
1345 |
* exception |
1346 |
* @throws InterruptedException if the current thread was interrupted |
1347 |
* while waiting |
1348 |
* @throws TimeoutException if the wait timed out |
1349 |
*/ |
1350 |
public T get(long timeout, TimeUnit unit) |
1351 |
throws InterruptedException, ExecutionException, TimeoutException { |
1352 |
Object r; Throwable ex, cause; |
1353 |
long nanos = unit.toNanos(timeout); |
1354 |
if (Thread.interrupted()) |
1355 |
throw new InterruptedException(); |
1356 |
if ((r = result) == null) |
1357 |
r = timedAwaitDone(nanos); |
1358 |
if (!(r instanceof AltResult)) { |
1359 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1360 |
return tr; |
1361 |
} |
1362 |
if ((ex = ((AltResult)r).ex) == null) |
1363 |
return null; |
1364 |
if (ex instanceof CancellationException) |
1365 |
throw (CancellationException)ex; |
1366 |
if ((ex instanceof CompletionException) && |
1367 |
(cause = ex.getCause()) != null) |
1368 |
ex = cause; |
1369 |
throw new ExecutionException(ex); |
1370 |
} |
1371 |
|
1372 |
/** |
1373 |
* Returns the result value when complete, or throws an |
1374 |
* (unchecked) exception if completed exceptionally. To better |
1375 |
* conform with the use of common functional forms, if a |
1376 |
* computation involved in the completion of this |
1377 |
* CompletableFuture threw an exception, this method throws an |
1378 |
* (unchecked) {@link CompletionException} with the underlying |
1379 |
* exception as its cause. |
1380 |
* |
1381 |
* @return the result value |
1382 |
* @throws CancellationException if the computation was cancelled |
1383 |
* @throws CompletionException if a completion computation threw |
1384 |
* an exception |
1385 |
*/ |
1386 |
public T join() { |
1387 |
Object r; Throwable ex; |
1388 |
if ((r = result) == null) |
1389 |
r = waitingGet(false); |
1390 |
if (!(r instanceof AltResult)) { |
1391 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1392 |
return tr; |
1393 |
} |
1394 |
if ((ex = ((AltResult)r).ex) == null) |
1395 |
return null; |
1396 |
if (ex instanceof CancellationException) |
1397 |
throw (CancellationException)ex; |
1398 |
if (ex instanceof CompletionException) |
1399 |
throw (CompletionException)ex; |
1400 |
throw new CompletionException(ex); |
1401 |
} |
1402 |
|
1403 |
/** |
1404 |
* Returns the result value (or throws any encountered exception) |
1405 |
* if completed, else returns the given valueIfAbsent. |
1406 |
* |
1407 |
* @param valueIfAbsent the value to return if not completed |
1408 |
* @return the result value, if completed, else the given valueIfAbsent |
1409 |
* @throws CancellationException if the computation was cancelled |
1410 |
* @throws CompletionException if a completion computation threw |
1411 |
* an exception |
1412 |
*/ |
1413 |
public T getNow(T valueIfAbsent) { |
1414 |
Object r; Throwable ex; |
1415 |
if ((r = result) == null) |
1416 |
return valueIfAbsent; |
1417 |
if (!(r instanceof AltResult)) { |
1418 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1419 |
return tr; |
1420 |
} |
1421 |
if ((ex = ((AltResult)r).ex) == null) |
1422 |
return null; |
1423 |
if (ex instanceof CancellationException) |
1424 |
throw (CancellationException)ex; |
1425 |
if (ex instanceof CompletionException) |
1426 |
throw (CompletionException)ex; |
1427 |
throw new CompletionException(ex); |
1428 |
} |
1429 |
|
1430 |
/** |
1431 |
* If not already completed, sets the value returned by {@link |
1432 |
* #get()} and related methods to the given value. |
1433 |
* |
1434 |
* @param value the result value |
1435 |
* @return {@code true} if this invocation caused this CompletableFuture |
1436 |
* to transition to a completed state, else {@code false} |
1437 |
*/ |
1438 |
public boolean complete(T value) { |
1439 |
boolean triggered = result == null && |
1440 |
UNSAFE.compareAndSwapObject(this, RESULT, null, |
1441 |
value == null ? NIL : value); |
1442 |
postComplete(); |
1443 |
return triggered; |
1444 |
} |
1445 |
|
1446 |
/** |
1447 |
* If not already completed, causes invocations of {@link #get()} |
1448 |
* and related methods to throw the given exception. |
1449 |
* |
1450 |
* @param ex the exception |
1451 |
* @return {@code true} if this invocation caused this CompletableFuture |
1452 |
* to transition to a completed state, else {@code false} |
1453 |
*/ |
1454 |
public boolean completeExceptionally(Throwable ex) { |
1455 |
if (ex == null) throw new NullPointerException(); |
1456 |
boolean triggered = result == null && |
1457 |
UNSAFE.compareAndSwapObject(this, RESULT, null, new AltResult(ex)); |
1458 |
postComplete(); |
1459 |
return triggered; |
1460 |
} |
1461 |
|
1462 |
/** |
1463 |
* Creates and returns a CompletableFuture that is completed with |
1464 |
* the result of the given function of this CompletableFuture. |
1465 |
* If this CompletableFuture completes exceptionally, |
1466 |
* then the returned CompletableFuture also does so, |
1467 |
* with a CompletionException holding this exception as |
1468 |
* its cause. |
1469 |
* |
1470 |
* @param fn the function to use to compute the value of |
1471 |
* the returned CompletableFuture |
1472 |
* @return the new CompletableFuture |
1473 |
*/ |
1474 |
public <U> CompletableFuture<U> thenApply(Fun<? super T,? extends U> fn) { |
1475 |
return doThenApply(fn, null); |
1476 |
} |
1477 |
|
1478 |
/** |
1479 |
* Creates and returns a CompletableFuture that is asynchronously |
1480 |
* completed using the {@link ForkJoinPool#commonPool()} with the |
1481 |
* result of the given function of this CompletableFuture. If |
1482 |
* this CompletableFuture completes exceptionally, then the |
1483 |
* returned CompletableFuture also does so, with a |
1484 |
* CompletionException holding this exception as its cause. |
1485 |
* |
1486 |
* @param fn the function to use to compute the value of |
1487 |
* the returned CompletableFuture |
1488 |
* @return the new CompletableFuture |
1489 |
*/ |
1490 |
public <U> CompletableFuture<U> thenApplyAsync(Fun<? super T,? extends U> fn) { |
1491 |
return doThenApply(fn, ForkJoinPool.commonPool()); |
1492 |
} |
1493 |
|
1494 |
/** |
1495 |
* Creates and returns a CompletableFuture that is asynchronously |
1496 |
* completed using the given executor with the result of the given |
1497 |
* function of this CompletableFuture. If this CompletableFuture |
1498 |
* completes exceptionally, then the returned CompletableFuture |
1499 |
* also does so, with a CompletionException holding this exception as |
1500 |
* its cause. |
1501 |
* |
1502 |
* @param fn the function to use to compute the value of |
1503 |
* the returned CompletableFuture |
1504 |
* @param executor the executor to use for asynchronous execution |
1505 |
* @return the new CompletableFuture |
1506 |
*/ |
1507 |
public <U> CompletableFuture<U> thenApplyAsync(Fun<? super T,? extends U> fn, |
1508 |
Executor executor) { |
1509 |
if (executor == null) throw new NullPointerException(); |
1510 |
return doThenApply(fn, executor); |
1511 |
} |
1512 |
|
1513 |
private <U> CompletableFuture<U> doThenApply(Fun<? super T,? extends U> fn, |
1514 |
Executor e) { |
1515 |
if (fn == null) throw new NullPointerException(); |
1516 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
1517 |
ApplyCompletion<T,U> d = null; |
1518 |
Object r; |
1519 |
if ((r = result) == null) { |
1520 |
CompletionNode p = new CompletionNode |
1521 |
(d = new ApplyCompletion<T,U>(this, fn, dst, e)); |
1522 |
while ((r = result) == null) { |
1523 |
if (UNSAFE.compareAndSwapObject |
1524 |
(this, COMPLETIONS, p.next = completions, p)) |
1525 |
break; |
1526 |
} |
1527 |
} |
1528 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1529 |
T t; Throwable ex; |
1530 |
if (r instanceof AltResult) { |
1531 |
ex = ((AltResult)r).ex; |
1532 |
t = null; |
1533 |
} |
1534 |
else { |
1535 |
ex = null; |
1536 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1537 |
t = tr; |
1538 |
} |
1539 |
U u = null; |
1540 |
if (ex == null) { |
1541 |
try { |
1542 |
if (e != null) |
1543 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
1544 |
else |
1545 |
u = fn.apply(t); |
1546 |
} catch (Throwable rex) { |
1547 |
ex = rex; |
1548 |
} |
1549 |
} |
1550 |
if (e == null || ex != null) |
1551 |
dst.internalComplete(u, ex); |
1552 |
} |
1553 |
helpPostComplete(); |
1554 |
return dst; |
1555 |
} |
1556 |
|
1557 |
/** |
1558 |
* Creates and returns a CompletableFuture that is completed after |
1559 |
* performing the given action with this CompletableFuture's |
1560 |
* result when it completes. If this CompletableFuture |
1561 |
* completes exceptionally, then the returned CompletableFuture |
1562 |
* also does so, with a CompletionException holding this exception as |
1563 |
* its cause. |
1564 |
* |
1565 |
* @param block the action to perform before completing the |
1566 |
* returned CompletableFuture |
1567 |
* @return the new CompletableFuture |
1568 |
*/ |
1569 |
public CompletableFuture<Void> thenAccept(Action<? super T> block) { |
1570 |
return doThenAccept(block, null); |
1571 |
} |
1572 |
|
1573 |
/** |
1574 |
* Creates and returns a CompletableFuture that is asynchronously |
1575 |
* completed using the {@link ForkJoinPool#commonPool()} with this |
1576 |
* CompletableFuture's result when it completes. If this |
1577 |
* CompletableFuture completes exceptionally, then the returned |
1578 |
* CompletableFuture also does so, with a CompletionException holding |
1579 |
* this exception as its cause. |
1580 |
* |
1581 |
* @param block the action to perform before completing the |
1582 |
* returned CompletableFuture |
1583 |
* @return the new CompletableFuture |
1584 |
*/ |
1585 |
public CompletableFuture<Void> thenAcceptAsync(Action<? super T> block) { |
1586 |
return doThenAccept(block, ForkJoinPool.commonPool()); |
1587 |
} |
1588 |
|
1589 |
/** |
1590 |
* Creates and returns a CompletableFuture that is asynchronously |
1591 |
* completed using the given executor with this |
1592 |
* CompletableFuture's result when it completes. If this |
1593 |
* CompletableFuture completes exceptionally, then the returned |
1594 |
* CompletableFuture also does so, with a CompletionException holding |
1595 |
* this exception as its cause. |
1596 |
* |
1597 |
* @param block the action to perform before completing the |
1598 |
* returned CompletableFuture |
1599 |
* @param executor the executor to use for asynchronous execution |
1600 |
* @return the new CompletableFuture |
1601 |
*/ |
1602 |
public CompletableFuture<Void> thenAcceptAsync(Action<? super T> block, |
1603 |
Executor executor) { |
1604 |
if (executor == null) throw new NullPointerException(); |
1605 |
return doThenAccept(block, executor); |
1606 |
} |
1607 |
|
1608 |
private CompletableFuture<Void> doThenAccept(Action<? super T> fn, |
1609 |
Executor e) { |
1610 |
if (fn == null) throw new NullPointerException(); |
1611 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1612 |
AcceptCompletion<T> d = null; |
1613 |
Object r; |
1614 |
if ((r = result) == null) { |
1615 |
CompletionNode p = new CompletionNode |
1616 |
(d = new AcceptCompletion<T>(this, fn, dst, e)); |
1617 |
while ((r = result) == null) { |
1618 |
if (UNSAFE.compareAndSwapObject |
1619 |
(this, COMPLETIONS, p.next = completions, p)) |
1620 |
break; |
1621 |
} |
1622 |
} |
1623 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1624 |
T t; Throwable ex; |
1625 |
if (r instanceof AltResult) { |
1626 |
ex = ((AltResult)r).ex; |
1627 |
t = null; |
1628 |
} |
1629 |
else { |
1630 |
ex = null; |
1631 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1632 |
t = tr; |
1633 |
} |
1634 |
if (ex == null) { |
1635 |
try { |
1636 |
if (e != null) |
1637 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
1638 |
else |
1639 |
fn.accept(t); |
1640 |
} catch (Throwable rex) { |
1641 |
ex = rex; |
1642 |
} |
1643 |
} |
1644 |
if (e == null || ex != null) |
1645 |
dst.internalComplete(null, ex); |
1646 |
} |
1647 |
helpPostComplete(); |
1648 |
return dst; |
1649 |
} |
1650 |
|
1651 |
/** |
1652 |
* Creates and returns a CompletableFuture that is completed after |
1653 |
* performing the given action when this CompletableFuture |
1654 |
* completes. If this CompletableFuture completes exceptionally, |
1655 |
* then the returned CompletableFuture also does so, with a |
1656 |
* CompletionException holding this exception as its cause. |
1657 |
* |
1658 |
* @param action the action to perform before completing the |
1659 |
* returned CompletableFuture |
1660 |
* @return the new CompletableFuture |
1661 |
*/ |
1662 |
public CompletableFuture<Void> thenRun(Runnable action) { |
1663 |
return doThenRun(action, null); |
1664 |
} |
1665 |
|
1666 |
/** |
1667 |
* Creates and returns a CompletableFuture that is asynchronously |
1668 |
* completed using the {@link ForkJoinPool#commonPool()} after |
1669 |
* performing the given action when this CompletableFuture |
1670 |
* completes. If this CompletableFuture completes exceptionally, |
1671 |
* then the returned CompletableFuture also does so, with a |
1672 |
* CompletionException holding this exception as its cause. |
1673 |
* |
1674 |
* @param action the action to perform before completing the |
1675 |
* returned CompletableFuture |
1676 |
* @return the new CompletableFuture |
1677 |
*/ |
1678 |
public CompletableFuture<Void> thenRunAsync(Runnable action) { |
1679 |
return doThenRun(action, ForkJoinPool.commonPool()); |
1680 |
} |
1681 |
|
1682 |
/** |
1683 |
* Creates and returns a CompletableFuture that is asynchronously |
1684 |
* completed using the given executor after performing the given |
1685 |
* action when this CompletableFuture completes. If this |
1686 |
* CompletableFuture completes exceptionally, then the returned |
1687 |
* CompletableFuture also does so, with a CompletionException holding |
1688 |
* this exception as its cause. |
1689 |
* |
1690 |
* @param action the action to perform before completing the |
1691 |
* returned CompletableFuture |
1692 |
* @param executor the executor to use for asynchronous execution |
1693 |
* @return the new CompletableFuture |
1694 |
*/ |
1695 |
public CompletableFuture<Void> thenRunAsync(Runnable action, |
1696 |
Executor executor) { |
1697 |
if (executor == null) throw new NullPointerException(); |
1698 |
return doThenRun(action, executor); |
1699 |
} |
1700 |
|
1701 |
private CompletableFuture<Void> doThenRun(Runnable action, |
1702 |
Executor e) { |
1703 |
if (action == null) throw new NullPointerException(); |
1704 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1705 |
RunCompletion<T> d = null; |
1706 |
Object r; |
1707 |
if ((r = result) == null) { |
1708 |
CompletionNode p = new CompletionNode |
1709 |
(d = new RunCompletion<T>(this, action, dst, e)); |
1710 |
while ((r = result) == null) { |
1711 |
if (UNSAFE.compareAndSwapObject |
1712 |
(this, COMPLETIONS, p.next = completions, p)) |
1713 |
break; |
1714 |
} |
1715 |
} |
1716 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1717 |
Throwable ex; |
1718 |
if (r instanceof AltResult) |
1719 |
ex = ((AltResult)r).ex; |
1720 |
else |
1721 |
ex = null; |
1722 |
if (ex == null) { |
1723 |
try { |
1724 |
if (e != null) |
1725 |
e.execute(new AsyncRun(action, dst)); |
1726 |
else |
1727 |
action.run(); |
1728 |
} catch (Throwable rex) { |
1729 |
ex = rex; |
1730 |
} |
1731 |
} |
1732 |
if (e == null || ex != null) |
1733 |
dst.internalComplete(null, ex); |
1734 |
} |
1735 |
helpPostComplete(); |
1736 |
return dst; |
1737 |
} |
1738 |
|
1739 |
/** |
1740 |
* Creates and returns a CompletableFuture that is completed with |
1741 |
* the result of the given function of this and the other given |
1742 |
* CompletableFuture's results when both complete. If this or |
1743 |
* the other CompletableFuture complete exceptionally, then the |
1744 |
* returned CompletableFuture also does so, with a |
1745 |
* CompletionException holding the exception as its cause. |
1746 |
* |
1747 |
* @param other the other CompletableFuture |
1748 |
* @param fn the function to use to compute the value of |
1749 |
* the returned CompletableFuture |
1750 |
* @return the new CompletableFuture |
1751 |
*/ |
1752 |
public <U,V> CompletableFuture<V> thenCombine(CompletableFuture<? extends U> other, |
1753 |
BiFun<? super T,? super U,? extends V> fn) { |
1754 |
return doThenBiApply(other, fn, null); |
1755 |
} |
1756 |
|
1757 |
/** |
1758 |
* Creates and returns a CompletableFuture that is asynchronously |
1759 |
* completed using the {@link ForkJoinPool#commonPool()} with |
1760 |
* the result of the given function of this and the other given |
1761 |
* CompletableFuture's results when both complete. If this or |
1762 |
* the other CompletableFuture complete exceptionally, then the |
1763 |
* returned CompletableFuture also does so, with a |
1764 |
* CompletionException holding the exception as its cause. |
1765 |
* |
1766 |
* @param other the other CompletableFuture |
1767 |
* @param fn the function to use to compute the value of |
1768 |
* the returned CompletableFuture |
1769 |
* @return the new CompletableFuture |
1770 |
*/ |
1771 |
public <U,V> CompletableFuture<V> thenCombineAsync(CompletableFuture<? extends U> other, |
1772 |
BiFun<? super T,? super U,? extends V> fn) { |
1773 |
return doThenBiApply(other, fn, ForkJoinPool.commonPool()); |
1774 |
} |
1775 |
|
1776 |
/** |
1777 |
* Creates and returns a CompletableFuture that is |
1778 |
* asynchronously completed using the given executor with the |
1779 |
* result of the given function of this and the other given |
1780 |
* CompletableFuture's results when both complete. If this or |
1781 |
* the other CompletableFuture complete exceptionally, then the |
1782 |
* returned CompletableFuture also does so, with a |
1783 |
* CompletionException holding the exception as its cause. |
1784 |
* |
1785 |
* @param other the other CompletableFuture |
1786 |
* @param fn the function to use to compute the value of |
1787 |
* the returned CompletableFuture |
1788 |
* @param executor the executor to use for asynchronous execution |
1789 |
* @return the new CompletableFuture |
1790 |
*/ |
1791 |
public <U,V> CompletableFuture<V> thenCombineAsync(CompletableFuture<? extends U> other, |
1792 |
BiFun<? super T,? super U,? extends V> fn, |
1793 |
Executor executor) { |
1794 |
if (executor == null) throw new NullPointerException(); |
1795 |
return doThenBiApply(other, fn, executor); |
1796 |
} |
1797 |
|
1798 |
private <U,V> CompletableFuture<V> doThenBiApply(CompletableFuture<? extends U> other, |
1799 |
BiFun<? super T,? super U,? extends V> fn, |
1800 |
Executor e) { |
1801 |
if (other == null || fn == null) throw new NullPointerException(); |
1802 |
CompletableFuture<V> dst = new CompletableFuture<V>(); |
1803 |
BiApplyCompletion<T,U,V> d = null; |
1804 |
Object r, s = null; |
1805 |
if ((r = result) == null || (s = other.result) == null) { |
1806 |
d = new BiApplyCompletion<T,U,V>(this, other, fn, dst, e); |
1807 |
CompletionNode q = null, p = new CompletionNode(d); |
1808 |
while ((r == null && (r = result) == null) || |
1809 |
(s == null && (s = other.result) == null)) { |
1810 |
if (q != null) { |
1811 |
if (s != null || |
1812 |
UNSAFE.compareAndSwapObject |
1813 |
(other, COMPLETIONS, q.next = other.completions, q)) |
1814 |
break; |
1815 |
} |
1816 |
else if (r != null || |
1817 |
UNSAFE.compareAndSwapObject |
1818 |
(this, COMPLETIONS, p.next = completions, p)) { |
1819 |
if (s != null) |
1820 |
break; |
1821 |
q = new CompletionNode(d); |
1822 |
} |
1823 |
} |
1824 |
} |
1825 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
1826 |
T t; U u; Throwable ex; |
1827 |
if (r instanceof AltResult) { |
1828 |
ex = ((AltResult)r).ex; |
1829 |
t = null; |
1830 |
} |
1831 |
else { |
1832 |
ex = null; |
1833 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1834 |
t = tr; |
1835 |
} |
1836 |
if (ex != null) |
1837 |
u = null; |
1838 |
else if (s instanceof AltResult) { |
1839 |
ex = ((AltResult)s).ex; |
1840 |
u = null; |
1841 |
} |
1842 |
else { |
1843 |
@SuppressWarnings("unchecked") U us = (U) s; |
1844 |
u = us; |
1845 |
} |
1846 |
V v = null; |
1847 |
if (ex == null) { |
1848 |
try { |
1849 |
if (e != null) |
1850 |
e.execute(new AsyncBiApply<T,U,V>(t, u, fn, dst)); |
1851 |
else |
1852 |
v = fn.apply(t, u); |
1853 |
} catch (Throwable rex) { |
1854 |
ex = rex; |
1855 |
} |
1856 |
} |
1857 |
if (e == null || ex != null) |
1858 |
dst.internalComplete(v, ex); |
1859 |
} |
1860 |
helpPostComplete(); |
1861 |
other.helpPostComplete(); |
1862 |
return dst; |
1863 |
} |
1864 |
|
1865 |
/** |
1866 |
* Creates and returns a CompletableFuture that is completed with |
1867 |
* the results of this and the other given CompletableFuture if |
1868 |
* both complete. If this and/or the other CompletableFuture |
1869 |
* complete exceptionally, then the returned CompletableFuture |
1870 |
* also does so, with a CompletionException holding one of these |
1871 |
* exceptions as its cause. |
1872 |
* |
1873 |
* @param other the other CompletableFuture |
1874 |
* @param block the action to perform before completing the |
1875 |
* returned CompletableFuture |
1876 |
* @return the new CompletableFuture |
1877 |
*/ |
1878 |
public <U> CompletableFuture<Void> thenAcceptBoth(CompletableFuture<? extends U> other, |
1879 |
BiAction<? super T, ? super U> block) { |
1880 |
return doThenBiAccept(other, block, null); |
1881 |
} |
1882 |
|
1883 |
/** |
1884 |
* Creates and returns a CompletableFuture that is completed |
1885 |
* asynchronously using the {@link ForkJoinPool#commonPool()} with |
1886 |
* the results of this and the other given CompletableFuture when |
1887 |
* both complete. If this and/or the other CompletableFuture |
1888 |
* complete exceptionally, then the returned CompletableFuture |
1889 |
* also does so, with a CompletionException holding one of these |
1890 |
* exceptions as its cause. |
1891 |
* |
1892 |
* @param other the other CompletableFuture |
1893 |
* @param block the action to perform before completing the |
1894 |
* returned CompletableFuture |
1895 |
* @return the new CompletableFuture |
1896 |
*/ |
1897 |
public <U> CompletableFuture<Void> thenAcceptBothAsync(CompletableFuture<? extends U> other, |
1898 |
BiAction<? super T, ? super U> block) { |
1899 |
return doThenBiAccept(other, block, ForkJoinPool.commonPool()); |
1900 |
} |
1901 |
|
1902 |
/** |
1903 |
* Creates and returns a CompletableFuture that is completed |
1904 |
* asynchronously using the given executor with the results of |
1905 |
* this and the other given CompletableFuture when both complete. |
1906 |
* If this and/or the other CompletableFuture complete |
1907 |
* exceptionally, then the returned CompletableFuture also does |
1908 |
* so, with a CompletionException holding one of these exceptions as |
1909 |
* its cause. |
1910 |
* |
1911 |
* @param other the other CompletableFuture |
1912 |
* @param block the action to perform before completing the |
1913 |
* returned CompletableFuture |
1914 |
* @param executor the executor to use for asynchronous execution |
1915 |
* @return the new CompletableFuture |
1916 |
*/ |
1917 |
public <U> CompletableFuture<Void> thenAcceptBothAsync(CompletableFuture<? extends U> other, |
1918 |
BiAction<? super T, ? super U> block, |
1919 |
Executor executor) { |
1920 |
if (executor == null) throw new NullPointerException(); |
1921 |
return doThenBiAccept(other, block, executor); |
1922 |
} |
1923 |
|
1924 |
private <U> CompletableFuture<Void> doThenBiAccept(CompletableFuture<? extends U> other, |
1925 |
BiAction<? super T,? super U> fn, |
1926 |
Executor e) { |
1927 |
if (other == null || fn == null) throw new NullPointerException(); |
1928 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1929 |
BiAcceptCompletion<T,U> d = null; |
1930 |
Object r, s = null; |
1931 |
if ((r = result) == null || (s = other.result) == null) { |
1932 |
d = new BiAcceptCompletion<T,U>(this, other, fn, dst, e); |
1933 |
CompletionNode q = null, p = new CompletionNode(d); |
1934 |
while ((r == null && (r = result) == null) || |
1935 |
(s == null && (s = other.result) == null)) { |
1936 |
if (q != null) { |
1937 |
if (s != null || |
1938 |
UNSAFE.compareAndSwapObject |
1939 |
(other, COMPLETIONS, q.next = other.completions, q)) |
1940 |
break; |
1941 |
} |
1942 |
else if (r != null || |
1943 |
UNSAFE.compareAndSwapObject |
1944 |
(this, COMPLETIONS, p.next = completions, p)) { |
1945 |
if (s != null) |
1946 |
break; |
1947 |
q = new CompletionNode(d); |
1948 |
} |
1949 |
} |
1950 |
} |
1951 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
1952 |
T t; U u; Throwable ex; |
1953 |
if (r instanceof AltResult) { |
1954 |
ex = ((AltResult)r).ex; |
1955 |
t = null; |
1956 |
} |
1957 |
else { |
1958 |
ex = null; |
1959 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1960 |
t = tr; |
1961 |
} |
1962 |
if (ex != null) |
1963 |
u = null; |
1964 |
else if (s instanceof AltResult) { |
1965 |
ex = ((AltResult)s).ex; |
1966 |
u = null; |
1967 |
} |
1968 |
else { |
1969 |
@SuppressWarnings("unchecked") U us = (U) s; |
1970 |
u = us; |
1971 |
} |
1972 |
if (ex == null) { |
1973 |
try { |
1974 |
if (e != null) |
1975 |
e.execute(new AsyncBiAccept<T,U>(t, u, fn, dst)); |
1976 |
else |
1977 |
fn.accept(t, u); |
1978 |
} catch (Throwable rex) { |
1979 |
ex = rex; |
1980 |
} |
1981 |
} |
1982 |
if (e == null || ex != null) |
1983 |
dst.internalComplete(null, ex); |
1984 |
} |
1985 |
helpPostComplete(); |
1986 |
other.helpPostComplete(); |
1987 |
return dst; |
1988 |
} |
1989 |
|
1990 |
/** |
1991 |
* Creates and returns a CompletableFuture that is completed |
1992 |
* when this and the other given CompletableFuture both |
1993 |
* complete. If this and/or the other CompletableFuture complete |
1994 |
* exceptionally, then the returned CompletableFuture also does |
1995 |
* so, with a CompletionException holding one of these exceptions as |
1996 |
* its cause. |
1997 |
* |
1998 |
* @param other the other CompletableFuture |
1999 |
* @param action the action to perform before completing the |
2000 |
* returned CompletableFuture |
2001 |
* @return the new CompletableFuture |
2002 |
*/ |
2003 |
public CompletableFuture<Void> runAfterBoth(CompletableFuture<?> other, |
2004 |
Runnable action) { |
2005 |
return doThenBiRun(other, action, null); |
2006 |
} |
2007 |
|
2008 |
/** |
2009 |
* Creates and returns a CompletableFuture that is completed |
2010 |
* asynchronously using the {@link ForkJoinPool#commonPool()} |
2011 |
* when this and the other given CompletableFuture both |
2012 |
* complete. If this and/or the other CompletableFuture complete |
2013 |
* exceptionally, then the returned CompletableFuture also does |
2014 |
* so, with a CompletionException holding one of these exceptions as |
2015 |
* its cause. |
2016 |
* |
2017 |
* @param other the other CompletableFuture |
2018 |
* @param action the action to perform before completing the |
2019 |
* returned CompletableFuture |
2020 |
* @return the new CompletableFuture |
2021 |
*/ |
2022 |
public CompletableFuture<Void> runAfterBothAsync(CompletableFuture<?> other, |
2023 |
Runnable action) { |
2024 |
return doThenBiRun(other, action, ForkJoinPool.commonPool()); |
2025 |
} |
2026 |
|
2027 |
/** |
2028 |
* Creates and returns a CompletableFuture that is completed |
2029 |
* asynchronously using the given executor |
2030 |
* when this and the other given CompletableFuture both |
2031 |
* complete. If this and/or the other CompletableFuture complete |
2032 |
* exceptionally, then the returned CompletableFuture also does |
2033 |
* so, with a CompletionException holding one of these exceptions as |
2034 |
* its cause. |
2035 |
* |
2036 |
* @param other the other CompletableFuture |
2037 |
* @param action the action to perform before completing the |
2038 |
* returned CompletableFuture |
2039 |
* @param executor the executor to use for asynchronous execution |
2040 |
* @return the new CompletableFuture |
2041 |
*/ |
2042 |
public CompletableFuture<Void> runAfterBothAsync(CompletableFuture<?> other, |
2043 |
Runnable action, |
2044 |
Executor executor) { |
2045 |
if (executor == null) throw new NullPointerException(); |
2046 |
return doThenBiRun(other, action, executor); |
2047 |
} |
2048 |
|
2049 |
private CompletableFuture<Void> doThenBiRun(CompletableFuture<?> other, |
2050 |
Runnable action, |
2051 |
Executor e) { |
2052 |
if (other == null || action == null) throw new NullPointerException(); |
2053 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2054 |
BiRunCompletion<T> d = null; |
2055 |
Object r, s = null; |
2056 |
if ((r = result) == null || (s = other.result) == null) { |
2057 |
d = new BiRunCompletion<T>(this, other, action, dst, e); |
2058 |
CompletionNode q = null, p = new CompletionNode(d); |
2059 |
while ((r == null && (r = result) == null) || |
2060 |
(s == null && (s = other.result) == null)) { |
2061 |
if (q != null) { |
2062 |
if (s != null || |
2063 |
UNSAFE.compareAndSwapObject |
2064 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2065 |
break; |
2066 |
} |
2067 |
else if (r != null || |
2068 |
UNSAFE.compareAndSwapObject |
2069 |
(this, COMPLETIONS, p.next = completions, p)) { |
2070 |
if (s != null) |
2071 |
break; |
2072 |
q = new CompletionNode(d); |
2073 |
} |
2074 |
} |
2075 |
} |
2076 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
2077 |
Throwable ex; |
2078 |
if (r instanceof AltResult) |
2079 |
ex = ((AltResult)r).ex; |
2080 |
else |
2081 |
ex = null; |
2082 |
if (ex == null && (s instanceof AltResult)) |
2083 |
ex = ((AltResult)s).ex; |
2084 |
if (ex == null) { |
2085 |
try { |
2086 |
if (e != null) |
2087 |
e.execute(new AsyncRun(action, dst)); |
2088 |
else |
2089 |
action.run(); |
2090 |
} catch (Throwable rex) { |
2091 |
ex = rex; |
2092 |
} |
2093 |
} |
2094 |
if (e == null || ex != null) |
2095 |
dst.internalComplete(null, ex); |
2096 |
} |
2097 |
helpPostComplete(); |
2098 |
other.helpPostComplete(); |
2099 |
return dst; |
2100 |
} |
2101 |
|
2102 |
/** |
2103 |
* Creates and returns a CompletableFuture that is completed with |
2104 |
* the result of the given function of either this or the other |
2105 |
* given CompletableFuture's results when either complete. If |
2106 |
* this and/or the other CompletableFuture complete exceptionally, |
2107 |
* then the returned CompletableFuture may also do so, with a |
2108 |
* CompletionException holding one of these exceptions as its cause. |
2109 |
* No guarantees are made about which result or exception is used |
2110 |
* in the returned CompletableFuture. |
2111 |
* |
2112 |
* @param other the other CompletableFuture |
2113 |
* @param fn the function to use to compute the value of |
2114 |
* the returned CompletableFuture |
2115 |
* @return the new CompletableFuture |
2116 |
*/ |
2117 |
public <U> CompletableFuture<U> applyToEither(CompletableFuture<? extends T> other, |
2118 |
Fun<? super T, U> fn) { |
2119 |
return doOrApply(other, fn, null); |
2120 |
} |
2121 |
|
2122 |
/** |
2123 |
* Creates and returns a CompletableFuture that is completed |
2124 |
* asynchronously using the {@link ForkJoinPool#commonPool()} with |
2125 |
* the result of the given function of either this or the other |
2126 |
* given CompletableFuture's results when either complete. If |
2127 |
* this and/or the other CompletableFuture complete exceptionally, |
2128 |
* then the returned CompletableFuture may also do so, with a |
2129 |
* CompletionException holding one of these exceptions as its cause. |
2130 |
* No guarantees are made about which result or exception is used |
2131 |
* in the returned CompletableFuture. |
2132 |
* |
2133 |
* @param other the other CompletableFuture |
2134 |
* @param fn the function to use to compute the value of |
2135 |
* the returned CompletableFuture |
2136 |
* @return the new CompletableFuture |
2137 |
*/ |
2138 |
public <U> CompletableFuture<U> applyToEitherAsync(CompletableFuture<? extends T> other, |
2139 |
Fun<? super T, U> fn) { |
2140 |
return doOrApply(other, fn, ForkJoinPool.commonPool()); |
2141 |
} |
2142 |
|
2143 |
/** |
2144 |
* Creates and returns a CompletableFuture that is completed |
2145 |
* asynchronously using the given executor with the result of the |
2146 |
* given function of either this or the other given |
2147 |
* CompletableFuture's results when either complete. If this |
2148 |
* and/or the other CompletableFuture complete exceptionally, then |
2149 |
* the returned CompletableFuture may also do so, with a |
2150 |
* CompletionException holding one of these exceptions as its cause. |
2151 |
* No guarantees are made about which result or exception is used |
2152 |
* in the returned CompletableFuture. |
2153 |
* |
2154 |
* @param other the other CompletableFuture |
2155 |
* @param fn the function to use to compute the value of |
2156 |
* the returned CompletableFuture |
2157 |
* @param executor the executor to use for asynchronous execution |
2158 |
* @return the new CompletableFuture |
2159 |
*/ |
2160 |
public <U> CompletableFuture<U> applyToEitherAsync(CompletableFuture<? extends T> other, |
2161 |
Fun<? super T, U> fn, |
2162 |
Executor executor) { |
2163 |
if (executor == null) throw new NullPointerException(); |
2164 |
return doOrApply(other, fn, executor); |
2165 |
} |
2166 |
|
2167 |
private <U> CompletableFuture<U> doOrApply(CompletableFuture<? extends T> other, |
2168 |
Fun<? super T, U> fn, |
2169 |
Executor e) { |
2170 |
if (other == null || fn == null) throw new NullPointerException(); |
2171 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
2172 |
OrApplyCompletion<T,U> d = null; |
2173 |
Object r; |
2174 |
if ((r = result) == null && (r = other.result) == null) { |
2175 |
d = new OrApplyCompletion<T,U>(this, other, fn, dst, e); |
2176 |
CompletionNode q = null, p = new CompletionNode(d); |
2177 |
while ((r = result) == null && (r = other.result) == null) { |
2178 |
if (q != null) { |
2179 |
if (UNSAFE.compareAndSwapObject |
2180 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2181 |
break; |
2182 |
} |
2183 |
else if (UNSAFE.compareAndSwapObject |
2184 |
(this, COMPLETIONS, p.next = completions, p)) |
2185 |
q = new CompletionNode(d); |
2186 |
} |
2187 |
} |
2188 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2189 |
T t; Throwable ex; |
2190 |
if (r instanceof AltResult) { |
2191 |
ex = ((AltResult)r).ex; |
2192 |
t = null; |
2193 |
} |
2194 |
else { |
2195 |
ex = null; |
2196 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2197 |
t = tr; |
2198 |
} |
2199 |
U u = null; |
2200 |
if (ex == null) { |
2201 |
try { |
2202 |
if (e != null) |
2203 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
2204 |
else |
2205 |
u = fn.apply(t); |
2206 |
} catch (Throwable rex) { |
2207 |
ex = rex; |
2208 |
} |
2209 |
} |
2210 |
if (e == null || ex != null) |
2211 |
dst.internalComplete(u, ex); |
2212 |
} |
2213 |
helpPostComplete(); |
2214 |
other.helpPostComplete(); |
2215 |
return dst; |
2216 |
} |
2217 |
|
2218 |
/** |
2219 |
* Creates and returns a CompletableFuture that is completed after |
2220 |
* performing the given action with the result of either this or the |
2221 |
* other given CompletableFuture's result, when either complete. |
2222 |
* If this and/or the other CompletableFuture complete |
2223 |
* exceptionally, then the returned CompletableFuture may also do |
2224 |
* so, with a CompletionException holding one of these exceptions as |
2225 |
* its cause. No guarantees are made about which exception is |
2226 |
* used in the returned CompletableFuture. |
2227 |
* |
2228 |
* @param other the other CompletableFuture |
2229 |
* @param block the action to perform before completing the |
2230 |
* returned CompletableFuture |
2231 |
* @return the new CompletableFuture |
2232 |
*/ |
2233 |
public CompletableFuture<Void> acceptEither(CompletableFuture<? extends T> other, |
2234 |
Action<? super T> block) { |
2235 |
return doOrAccept(other, block, null); |
2236 |
} |
2237 |
|
2238 |
/** |
2239 |
* Creates and returns a CompletableFuture that is completed |
2240 |
* asynchronously using the {@link ForkJoinPool#commonPool()}, |
2241 |
* performing the given action with the result of either this or |
2242 |
* the other given CompletableFuture's result, when either |
2243 |
* complete. If this and/or the other CompletableFuture complete |
2244 |
* exceptionally, then the returned CompletableFuture may also do |
2245 |
* so, with a CompletionException holding one of these exceptions as |
2246 |
* its cause. No guarantees are made about which exception is |
2247 |
* used in the returned CompletableFuture. |
2248 |
* |
2249 |
* @param other the other CompletableFuture |
2250 |
* @param block the action to perform before completing the |
2251 |
* returned CompletableFuture |
2252 |
* @return the new CompletableFuture |
2253 |
*/ |
2254 |
public CompletableFuture<Void> acceptEitherAsync(CompletableFuture<? extends T> other, |
2255 |
Action<? super T> block) { |
2256 |
return doOrAccept(other, block, ForkJoinPool.commonPool()); |
2257 |
} |
2258 |
|
2259 |
/** |
2260 |
* Creates and returns a CompletableFuture that is completed |
2261 |
* asynchronously using the given executor, |
2262 |
* performing the given action with the result of either this or |
2263 |
* the other given CompletableFuture's result, when either |
2264 |
* complete. If this and/or the other CompletableFuture complete |
2265 |
* exceptionally, then the returned CompletableFuture may also do |
2266 |
* so, with a CompletionException holding one of these exceptions as |
2267 |
* its cause. No guarantees are made about which exception is |
2268 |
* used in the returned CompletableFuture. |
2269 |
* |
2270 |
* @param other the other CompletableFuture |
2271 |
* @param block the action to perform before completing the |
2272 |
* returned CompletableFuture |
2273 |
* @param executor the executor to use for asynchronous execution |
2274 |
* @return the new CompletableFuture |
2275 |
*/ |
2276 |
public CompletableFuture<Void> acceptEitherAsync(CompletableFuture<? extends T> other, |
2277 |
Action<? super T> block, |
2278 |
Executor executor) { |
2279 |
if (executor == null) throw new NullPointerException(); |
2280 |
return doOrAccept(other, block, executor); |
2281 |
} |
2282 |
|
2283 |
private CompletableFuture<Void> doOrAccept(CompletableFuture<? extends T> other, |
2284 |
Action<? super T> fn, |
2285 |
Executor e) { |
2286 |
if (other == null || fn == null) throw new NullPointerException(); |
2287 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2288 |
OrAcceptCompletion<T> d = null; |
2289 |
Object r; |
2290 |
if ((r = result) == null && (r = other.result) == null) { |
2291 |
d = new OrAcceptCompletion<T>(this, other, fn, dst, e); |
2292 |
CompletionNode q = null, p = new CompletionNode(d); |
2293 |
while ((r = result) == null && (r = other.result) == null) { |
2294 |
if (q != null) { |
2295 |
if (UNSAFE.compareAndSwapObject |
2296 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2297 |
break; |
2298 |
} |
2299 |
else if (UNSAFE.compareAndSwapObject |
2300 |
(this, COMPLETIONS, p.next = completions, p)) |
2301 |
q = new CompletionNode(d); |
2302 |
} |
2303 |
} |
2304 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2305 |
T t; Throwable ex; |
2306 |
if (r instanceof AltResult) { |
2307 |
ex = ((AltResult)r).ex; |
2308 |
t = null; |
2309 |
} |
2310 |
else { |
2311 |
ex = null; |
2312 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2313 |
t = tr; |
2314 |
} |
2315 |
if (ex == null) { |
2316 |
try { |
2317 |
if (e != null) |
2318 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
2319 |
else |
2320 |
fn.accept(t); |
2321 |
} catch (Throwable rex) { |
2322 |
ex = rex; |
2323 |
} |
2324 |
} |
2325 |
if (e == null || ex != null) |
2326 |
dst.internalComplete(null, ex); |
2327 |
} |
2328 |
helpPostComplete(); |
2329 |
other.helpPostComplete(); |
2330 |
return dst; |
2331 |
} |
2332 |
|
2333 |
/** |
2334 |
* Creates and returns a CompletableFuture that is completed |
2335 |
* after this or the other given CompletableFuture complete. If |
2336 |
* this and/or the other CompletableFuture complete exceptionally, |
2337 |
* then the returned CompletableFuture may also do so, with a |
2338 |
* CompletionException holding one of these exceptions as its cause. |
2339 |
* No guarantees are made about which exception is used in the |
2340 |
* returned CompletableFuture. |
2341 |
* |
2342 |
* @param other the other CompletableFuture |
2343 |
* @param action the action to perform before completing the |
2344 |
* returned CompletableFuture |
2345 |
* @return the new CompletableFuture |
2346 |
*/ |
2347 |
public CompletableFuture<Void> runAfterEither(CompletableFuture<?> other, |
2348 |
Runnable action) { |
2349 |
return doOrRun(other, action, null); |
2350 |
} |
2351 |
|
2352 |
/** |
2353 |
* Creates and returns a CompletableFuture that is completed |
2354 |
* asynchronously using the {@link ForkJoinPool#commonPool()} |
2355 |
* after this or the other given CompletableFuture complete. If |
2356 |
* this and/or the other CompletableFuture complete exceptionally, |
2357 |
* then the returned CompletableFuture may also do so, with a |
2358 |
* CompletionException holding one of these exceptions as its cause. |
2359 |
* No guarantees are made about which exception is used in the |
2360 |
* returned CompletableFuture. |
2361 |
* |
2362 |
* @param other the other CompletableFuture |
2363 |
* @param action the action to perform before completing the |
2364 |
* returned CompletableFuture |
2365 |
* @return the new CompletableFuture |
2366 |
*/ |
2367 |
public CompletableFuture<Void> runAfterEitherAsync(CompletableFuture<?> other, |
2368 |
Runnable action) { |
2369 |
return doOrRun(other, action, ForkJoinPool.commonPool()); |
2370 |
} |
2371 |
|
2372 |
/** |
2373 |
* Creates and returns a CompletableFuture that is completed |
2374 |
* asynchronously using the given executor after this or the other |
2375 |
* given CompletableFuture complete. If this and/or the other |
2376 |
* CompletableFuture complete exceptionally, then the returned |
2377 |
* CompletableFuture may also do so, with a CompletionException |
2378 |
* holding one of these exceptions as its cause. No guarantees are |
2379 |
* made about which exception is used in the returned |
2380 |
* CompletableFuture. |
2381 |
* |
2382 |
* @param other the other CompletableFuture |
2383 |
* @param action the action to perform before completing the |
2384 |
* returned CompletableFuture |
2385 |
* @param executor the executor to use for asynchronous execution |
2386 |
* @return the new CompletableFuture |
2387 |
*/ |
2388 |
public CompletableFuture<Void> runAfterEitherAsync(CompletableFuture<?> other, |
2389 |
Runnable action, |
2390 |
Executor executor) { |
2391 |
if (executor == null) throw new NullPointerException(); |
2392 |
return doOrRun(other, action, executor); |
2393 |
} |
2394 |
|
2395 |
private CompletableFuture<Void> doOrRun(CompletableFuture<?> other, |
2396 |
Runnable action, |
2397 |
Executor e) { |
2398 |
if (other == null || action == null) throw new NullPointerException(); |
2399 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2400 |
OrRunCompletion<T> d = null; |
2401 |
Object r; |
2402 |
if ((r = result) == null && (r = other.result) == null) { |
2403 |
d = new OrRunCompletion<T>(this, other, action, dst, e); |
2404 |
CompletionNode q = null, p = new CompletionNode(d); |
2405 |
while ((r = result) == null && (r = other.result) == null) { |
2406 |
if (q != null) { |
2407 |
if (UNSAFE.compareAndSwapObject |
2408 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2409 |
break; |
2410 |
} |
2411 |
else if (UNSAFE.compareAndSwapObject |
2412 |
(this, COMPLETIONS, p.next = completions, p)) |
2413 |
q = new CompletionNode(d); |
2414 |
} |
2415 |
} |
2416 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2417 |
Throwable ex; |
2418 |
if (r instanceof AltResult) |
2419 |
ex = ((AltResult)r).ex; |
2420 |
else |
2421 |
ex = null; |
2422 |
if (ex == null) { |
2423 |
try { |
2424 |
if (e != null) |
2425 |
e.execute(new AsyncRun(action, dst)); |
2426 |
else |
2427 |
action.run(); |
2428 |
} catch (Throwable rex) { |
2429 |
ex = rex; |
2430 |
} |
2431 |
} |
2432 |
if (e == null || ex != null) |
2433 |
dst.internalComplete(null, ex); |
2434 |
} |
2435 |
helpPostComplete(); |
2436 |
other.helpPostComplete(); |
2437 |
return dst; |
2438 |
} |
2439 |
|
2440 |
/** |
2441 |
* Returns a CompletableFuture (or an equivalent one) produced by |
2442 |
* the given function of the result of this CompletableFuture when |
2443 |
* completed. If this CompletableFuture completes exceptionally, |
2444 |
* then the returned CompletableFuture also does so, with a |
2445 |
* CompletionException holding this exception as its cause. |
2446 |
* |
2447 |
* @param fn the function returning a new CompletableFuture |
2448 |
* @return the CompletableFuture, that {@code isDone()} upon |
2449 |
* return if completed by the given function, or an exception |
2450 |
* occurs |
2451 |
*/ |
2452 |
public <U> CompletableFuture<U> thenCompose(Fun<? super T, |
2453 |
CompletableFuture<U>> fn) { |
2454 |
if (fn == null) throw new NullPointerException(); |
2455 |
CompletableFuture<U> dst = null; |
2456 |
ComposeCompletion<T,U> d = null; |
2457 |
Object r; |
2458 |
if ((r = result) == null) { |
2459 |
dst = new CompletableFuture<U>(); |
2460 |
CompletionNode p = new CompletionNode |
2461 |
(d = new ComposeCompletion<T,U>(this, fn, dst)); |
2462 |
while ((r = result) == null) { |
2463 |
if (UNSAFE.compareAndSwapObject |
2464 |
(this, COMPLETIONS, p.next = completions, p)) |
2465 |
break; |
2466 |
} |
2467 |
} |
2468 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2469 |
T t; Throwable ex; |
2470 |
if (r instanceof AltResult) { |
2471 |
ex = ((AltResult)r).ex; |
2472 |
t = null; |
2473 |
} |
2474 |
else { |
2475 |
ex = null; |
2476 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2477 |
t = tr; |
2478 |
} |
2479 |
if (ex == null) { |
2480 |
try { |
2481 |
dst = fn.apply(t); |
2482 |
} catch (Throwable rex) { |
2483 |
ex = rex; |
2484 |
} |
2485 |
} |
2486 |
if (dst == null) { |
2487 |
dst = new CompletableFuture<U>(); |
2488 |
if (ex == null) |
2489 |
ex = new NullPointerException(); |
2490 |
} |
2491 |
if (ex != null) |
2492 |
dst.internalComplete(null, ex); |
2493 |
} |
2494 |
helpPostComplete(); |
2495 |
dst.helpPostComplete(); |
2496 |
return dst; |
2497 |
} |
2498 |
|
2499 |
/** |
2500 |
* Creates and returns a CompletableFuture that is completed with |
2501 |
* the result of the given function of the exception triggering |
2502 |
* this CompletableFuture's completion when it completes |
2503 |
* exceptionally; Otherwise, if this CompletableFuture completes |
2504 |
* normally, then the returned CompletableFuture also completes |
2505 |
* normally with the same value. |
2506 |
* |
2507 |
* @param fn the function to use to compute the value of the |
2508 |
* returned CompletableFuture if this CompletableFuture completed |
2509 |
* exceptionally |
2510 |
* @return the new CompletableFuture |
2511 |
*/ |
2512 |
public CompletableFuture<T> exceptionally(Fun<Throwable, ? extends T> fn) { |
2513 |
if (fn == null) throw new NullPointerException(); |
2514 |
CompletableFuture<T> dst = new CompletableFuture<T>(); |
2515 |
ExceptionCompletion<T> d = null; |
2516 |
Object r; |
2517 |
if ((r = result) == null) { |
2518 |
CompletionNode p = |
2519 |
new CompletionNode(d = new ExceptionCompletion<T>(this, fn, dst)); |
2520 |
while ((r = result) == null) { |
2521 |
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, |
2522 |
p.next = completions, p)) |
2523 |
break; |
2524 |
} |
2525 |
} |
2526 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2527 |
T t = null; Throwable ex, dx = null; |
2528 |
if (r instanceof AltResult) { |
2529 |
if ((ex = ((AltResult)r).ex) != null) { |
2530 |
try { |
2531 |
t = fn.apply(ex); |
2532 |
} catch (Throwable rex) { |
2533 |
dx = rex; |
2534 |
} |
2535 |
} |
2536 |
} |
2537 |
else { |
2538 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2539 |
t = tr; |
2540 |
} |
2541 |
dst.internalComplete(t, dx); |
2542 |
} |
2543 |
helpPostComplete(); |
2544 |
return dst; |
2545 |
} |
2546 |
|
2547 |
/** |
2548 |
* Creates and returns a CompletableFuture that is completed with |
2549 |
* the result of the given function of the result and exception of |
2550 |
* this CompletableFuture's completion when it completes. The |
2551 |
* given function is invoked with the result (or {@code null} if |
2552 |
* none) and the exception (or {@code null} if none) of this |
2553 |
* CompletableFuture when complete. |
2554 |
* |
2555 |
* @param fn the function to use to compute the value of the |
2556 |
* returned CompletableFuture |
2557 |
* @return the new CompletableFuture |
2558 |
*/ |
2559 |
public <U> CompletableFuture<U> handle(BiFun<? super T, Throwable, ? extends U> fn) { |
2560 |
if (fn == null) throw new NullPointerException(); |
2561 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
2562 |
HandleCompletion<T,U> d = null; |
2563 |
Object r; |
2564 |
if ((r = result) == null) { |
2565 |
CompletionNode p = |
2566 |
new CompletionNode(d = new HandleCompletion<T,U>(this, fn, dst)); |
2567 |
while ((r = result) == null) { |
2568 |
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, |
2569 |
p.next = completions, p)) |
2570 |
break; |
2571 |
} |
2572 |
} |
2573 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2574 |
T t; Throwable ex; |
2575 |
if (r instanceof AltResult) { |
2576 |
ex = ((AltResult)r).ex; |
2577 |
t = null; |
2578 |
} |
2579 |
else { |
2580 |
ex = null; |
2581 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2582 |
t = tr; |
2583 |
} |
2584 |
U u; Throwable dx; |
2585 |
try { |
2586 |
u = fn.apply(t, ex); |
2587 |
dx = null; |
2588 |
} catch (Throwable rex) { |
2589 |
dx = rex; |
2590 |
u = null; |
2591 |
} |
2592 |
dst.internalComplete(u, dx); |
2593 |
} |
2594 |
helpPostComplete(); |
2595 |
return dst; |
2596 |
} |
2597 |
|
2598 |
/** |
2599 |
* Attempts to complete this CompletableFuture with |
2600 |
* a {@link CancellationException}. |
2601 |
* |
2602 |
* @param mayInterruptIfRunning this value has no effect in this |
2603 |
* implementation because interrupts are not used to control |
2604 |
* processing. |
2605 |
* |
2606 |
* @return {@code true} if this task is now cancelled |
2607 |
*/ |
2608 |
public boolean cancel(boolean mayInterruptIfRunning) { |
2609 |
Object r; |
2610 |
while ((r = result) == null) { |
2611 |
r = new AltResult(new CancellationException()); |
2612 |
if (UNSAFE.compareAndSwapObject(this, RESULT, null, r)) { |
2613 |
postComplete(); |
2614 |
return true; |
2615 |
} |
2616 |
} |
2617 |
return ((r instanceof AltResult) && |
2618 |
(((AltResult)r).ex instanceof CancellationException)); |
2619 |
} |
2620 |
|
2621 |
/** |
2622 |
* Returns {@code true} if this CompletableFuture was cancelled |
2623 |
* before it completed normally. |
2624 |
* |
2625 |
* @return {@code true} if this CompletableFuture was cancelled |
2626 |
* before it completed normally |
2627 |
*/ |
2628 |
public boolean isCancelled() { |
2629 |
Object r; |
2630 |
return ((r = result) instanceof AltResult) && |
2631 |
(((AltResult)r).ex instanceof CancellationException); |
2632 |
} |
2633 |
|
2634 |
/** |
2635 |
* Forcibly sets or resets the value subsequently returned by |
2636 |
* method {@link #get()} and related methods, whether or not |
2637 |
* already completed. This method is designed for use only in |
2638 |
* error recovery actions, and even in such situations may result |
2639 |
* in ongoing dependent completions using established versus |
2640 |
* overwritten outcomes. |
2641 |
* |
2642 |
* @param value the completion value |
2643 |
*/ |
2644 |
public void obtrudeValue(T value) { |
2645 |
result = (value == null) ? NIL : value; |
2646 |
postComplete(); |
2647 |
} |
2648 |
|
2649 |
/** |
2650 |
* Forcibly causes subsequent invocations of method {@link #get()} |
2651 |
* and related methods to throw the given exception, whether or |
2652 |
* not already completed. This method is designed for use only in |
2653 |
* recovery actions, and even in such situations may result in |
2654 |
* ongoing dependent completions using established versus |
2655 |
* overwritten outcomes. |
2656 |
* |
2657 |
* @param ex the exception |
2658 |
*/ |
2659 |
public void obtrudeException(Throwable ex) { |
2660 |
if (ex == null) throw new NullPointerException(); |
2661 |
result = new AltResult(ex); |
2662 |
postComplete(); |
2663 |
} |
2664 |
|
2665 |
// Unsafe mechanics |
2666 |
private static final sun.misc.Unsafe UNSAFE; |
2667 |
private static final long RESULT; |
2668 |
private static final long WAITERS; |
2669 |
private static final long COMPLETIONS; |
2670 |
static { |
2671 |
try { |
2672 |
UNSAFE = getUnsafe(); |
2673 |
Class<?> k = CompletableFuture.class; |
2674 |
RESULT = UNSAFE.objectFieldOffset |
2675 |
(k.getDeclaredField("result")); |
2676 |
WAITERS = UNSAFE.objectFieldOffset |
2677 |
(k.getDeclaredField("waiters")); |
2678 |
COMPLETIONS = UNSAFE.objectFieldOffset |
2679 |
(k.getDeclaredField("completions")); |
2680 |
} catch (Exception e) { |
2681 |
throw new Error(e); |
2682 |
} |
2683 |
} |
2684 |
|
2685 |
|
2686 |
/** |
2687 |
* Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. |
2688 |
* Replace with a simple call to Unsafe.getUnsafe when integrating |
2689 |
* into a jdk. |
2690 |
* |
2691 |
* @return a sun.misc.Unsafe |
2692 |
*/ |
2693 |
private static sun.misc.Unsafe getUnsafe() { |
2694 |
try { |
2695 |
return sun.misc.Unsafe.getUnsafe(); |
2696 |
} catch (SecurityException tryReflectionInstead) {} |
2697 |
try { |
2698 |
return java.security.AccessController.doPrivileged |
2699 |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
2700 |
public sun.misc.Unsafe run() throws Exception { |
2701 |
Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class; |
2702 |
for (java.lang.reflect.Field f : k.getDeclaredFields()) { |
2703 |
f.setAccessible(true); |
2704 |
Object x = f.get(null); |
2705 |
if (k.isInstance(x)) |
2706 |
return k.cast(x); |
2707 |
} |
2708 |
throw new NoSuchFieldError("the Unsafe"); |
2709 |
}}); |
2710 |
} catch (java.security.PrivilegedActionException e) { |
2711 |
throw new RuntimeException("Could not initialize intrinsics", |
2712 |
e.getCause()); |
2713 |
} |
2714 |
} |
2715 |
} |