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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 java.util.concurrent; |
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import java.util.function.Supplier; |
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import java.util.function.Consumer; |
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import java.util.function.BiConsumer; |
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import java.util.function.Function; |
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import java.util.function.BiFunction; |
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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.ForkJoinPool; |
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import java.util.concurrent.ForkJoinTask; |
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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, Consumers, 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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* @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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|
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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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} |
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else if (q == null) |
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q = new WaitNode(interruptible, 0L, 0L); |
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else if (!queued) |
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queued = UNSAFE.compareAndSwapObject(this, WAITERS, |
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q.next = waiters, q); |
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else if (interruptible && q.interruptControl < 0) { |
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removeWaiter(q); |
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return null; |
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} |
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else if (q.thread != null && result == null) { |
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try { |
279 |
ForkJoinPool.managedBlock(q); |
280 |
} catch (InterruptedException ex) { |
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q.interruptControl = -1; |
282 |
} |
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} |
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} |
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} |
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|
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/** |
288 |
* Awaits completion or aborts on interrupt or timeout. |
289 |
* |
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* @param nanos time to wait |
291 |
* @return raw result |
292 |
*/ |
293 |
private Object timedAwaitDone(long nanos) |
294 |
throws InterruptedException, TimeoutException { |
295 |
WaitNode q = null; |
296 |
boolean queued = false; |
297 |
for (Object r;;) { |
298 |
if ((r = result) != null) { |
299 |
if (q != null) { |
300 |
q.thread = null; |
301 |
if (q.interruptControl < 0) { |
302 |
removeWaiter(q); |
303 |
throw new InterruptedException(); |
304 |
} |
305 |
} |
306 |
postComplete(); |
307 |
return r; |
308 |
} |
309 |
else if (q == null) { |
310 |
if (nanos <= 0L) |
311 |
throw new TimeoutException(); |
312 |
long d = System.nanoTime() + nanos; |
313 |
q = new WaitNode(true, nanos, d == 0L ? 1L : d); // avoid 0 |
314 |
} |
315 |
else if (!queued) |
316 |
queued = UNSAFE.compareAndSwapObject(this, WAITERS, |
317 |
q.next = waiters, q); |
318 |
else if (q.interruptControl < 0) { |
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removeWaiter(q); |
320 |
throw new InterruptedException(); |
321 |
} |
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else if (q.nanos <= 0L) { |
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if (result == null) { |
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removeWaiter(q); |
325 |
throw new TimeoutException(); |
326 |
} |
327 |
} |
328 |
else if (q.thread != null && result == null) { |
329 |
try { |
330 |
ForkJoinPool.managedBlock(q); |
331 |
} catch (InterruptedException ex) { |
332 |
q.interruptControl = -1; |
333 |
} |
334 |
} |
335 |
} |
336 |
} |
337 |
|
338 |
/** |
339 |
* Tries to unlink a timed-out or interrupted wait node to avoid |
340 |
* accumulating garbage. Internal nodes are simply unspliced |
341 |
* without CAS since it is harmless if they are traversed anyway |
342 |
* by releasers. To avoid effects of unsplicing from already |
343 |
* removed nodes, the list is retraversed in case of an apparent |
344 |
* race. This is slow when there are a lot of nodes, but we don't |
345 |
* expect lists to be long enough to outweigh higher-overhead |
346 |
* schemes. |
347 |
*/ |
348 |
private void removeWaiter(WaitNode node) { |
349 |
if (node != null) { |
350 |
node.thread = null; |
351 |
retry: |
352 |
for (;;) { // restart on removeWaiter race |
353 |
for (WaitNode pred = null, q = waiters, s; q != null; q = s) { |
354 |
s = q.next; |
355 |
if (q.thread != null) |
356 |
pred = q; |
357 |
else if (pred != null) { |
358 |
pred.next = s; |
359 |
if (pred.thread == null) // check for race |
360 |
continue retry; |
361 |
} |
362 |
else if (!UNSAFE.compareAndSwapObject(this, WAITERS, q, s)) |
363 |
continue retry; |
364 |
} |
365 |
break; |
366 |
} |
367 |
} |
368 |
} |
369 |
|
370 |
/* ------------- Async tasks -------------- */ |
371 |
|
372 |
/** |
373 |
* A tagging interface identifying asynchronous tasks produced by |
374 |
* {@code async} methods. This may be useful for monitoring, |
375 |
* debugging, and tracking asynchronous activities. |
376 |
*/ |
377 |
public static interface AsynchronousCompletionTask { |
378 |
} |
379 |
|
380 |
/** Base class can act as either FJ or plain Runnable */ |
381 |
abstract static class Async extends ForkJoinTask<Void> |
382 |
implements Runnable, AsynchronousCompletionTask { |
383 |
public final Void getRawResult() { return null; } |
384 |
public final void setRawResult(Void v) { } |
385 |
public final void run() { exec(); } |
386 |
} |
387 |
|
388 |
static final class AsyncRun extends Async { |
389 |
final Runnable fn; |
390 |
final CompletableFuture<Void> dst; |
391 |
AsyncRun(Runnable fn, CompletableFuture<Void> dst) { |
392 |
this.fn = fn; this.dst = dst; |
393 |
} |
394 |
public final boolean exec() { |
395 |
CompletableFuture<Void> d; Throwable ex; |
396 |
if ((d = this.dst) != null && d.result == null) { |
397 |
try { |
398 |
fn.run(); |
399 |
ex = null; |
400 |
} catch (Throwable rex) { |
401 |
ex = rex; |
402 |
} |
403 |
d.internalComplete(null, ex); |
404 |
} |
405 |
return true; |
406 |
} |
407 |
private static final long serialVersionUID = 5232453952276885070L; |
408 |
} |
409 |
|
410 |
static final class AsyncSupply<U> extends Async { |
411 |
final Supplier<U> fn; |
412 |
final CompletableFuture<U> dst; |
413 |
AsyncSupply(Supplier<U> fn, CompletableFuture<U> dst) { |
414 |
this.fn = fn; this.dst = dst; |
415 |
} |
416 |
public final boolean exec() { |
417 |
CompletableFuture<U> d; U u; Throwable ex; |
418 |
if ((d = this.dst) != null && d.result == null) { |
419 |
try { |
420 |
u = fn.get(); |
421 |
ex = null; |
422 |
} catch (Throwable rex) { |
423 |
ex = rex; |
424 |
u = null; |
425 |
} |
426 |
d.internalComplete(u, ex); |
427 |
} |
428 |
return true; |
429 |
} |
430 |
private static final long serialVersionUID = 5232453952276885070L; |
431 |
} |
432 |
|
433 |
static final class AsyncApply<T,U> extends Async { |
434 |
final Function<? super T,? extends U> fn; |
435 |
final T arg; |
436 |
final CompletableFuture<U> dst; |
437 |
AsyncApply(T arg, Function<? super T,? extends U> fn, |
438 |
CompletableFuture<U> dst) { |
439 |
this.arg = arg; this.fn = fn; this.dst = dst; |
440 |
} |
441 |
public final boolean exec() { |
442 |
CompletableFuture<U> d; U u; Throwable ex; |
443 |
if ((d = this.dst) != null && d.result == null) { |
444 |
try { |
445 |
u = fn.apply(arg); |
446 |
ex = null; |
447 |
} catch (Throwable rex) { |
448 |
ex = rex; |
449 |
u = null; |
450 |
} |
451 |
d.internalComplete(u, ex); |
452 |
} |
453 |
return true; |
454 |
} |
455 |
private static final long serialVersionUID = 5232453952276885070L; |
456 |
} |
457 |
|
458 |
static final class AsyncBiApply<T,U,V> extends Async { |
459 |
final BiFunction<? super T,? super U,? extends V> fn; |
460 |
final T arg1; |
461 |
final U arg2; |
462 |
final CompletableFuture<V> dst; |
463 |
AsyncBiApply(T arg1, U arg2, |
464 |
BiFunction<? super T,? super U,? extends V> fn, |
465 |
CompletableFuture<V> dst) { |
466 |
this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; this.dst = dst; |
467 |
} |
468 |
public final boolean exec() { |
469 |
CompletableFuture<V> d; V v; Throwable ex; |
470 |
if ((d = this.dst) != null && d.result == null) { |
471 |
try { |
472 |
v = fn.apply(arg1, arg2); |
473 |
ex = null; |
474 |
} catch (Throwable rex) { |
475 |
ex = rex; |
476 |
v = null; |
477 |
} |
478 |
d.internalComplete(v, ex); |
479 |
} |
480 |
return true; |
481 |
} |
482 |
private static final long serialVersionUID = 5232453952276885070L; |
483 |
} |
484 |
|
485 |
static final class AsyncAccept<T> extends Async { |
486 |
final Consumer<? super T> fn; |
487 |
final T arg; |
488 |
final CompletableFuture<Void> dst; |
489 |
AsyncAccept(T arg, Consumer<? super T> fn, |
490 |
CompletableFuture<Void> dst) { |
491 |
this.arg = arg; this.fn = fn; this.dst = dst; |
492 |
} |
493 |
public final boolean exec() { |
494 |
CompletableFuture<Void> d; Throwable ex; |
495 |
if ((d = this.dst) != null && d.result == null) { |
496 |
try { |
497 |
fn.accept(arg); |
498 |
ex = null; |
499 |
} catch (Throwable rex) { |
500 |
ex = rex; |
501 |
} |
502 |
d.internalComplete(null, ex); |
503 |
} |
504 |
return true; |
505 |
} |
506 |
private static final long serialVersionUID = 5232453952276885070L; |
507 |
} |
508 |
|
509 |
static final class AsyncBiAccept<T,U> extends Async { |
510 |
final BiConsumer<? super T,? super U> fn; |
511 |
final T arg1; |
512 |
final U arg2; |
513 |
final CompletableFuture<Void> dst; |
514 |
AsyncBiAccept(T arg1, U arg2, |
515 |
BiConsumer<? super T,? super U> fn, |
516 |
CompletableFuture<Void> dst) { |
517 |
this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; this.dst = dst; |
518 |
} |
519 |
public final boolean exec() { |
520 |
CompletableFuture<Void> d; Throwable ex; |
521 |
if ((d = this.dst) != null && d.result == null) { |
522 |
try { |
523 |
fn.accept(arg1, arg2); |
524 |
ex = null; |
525 |
} catch (Throwable rex) { |
526 |
ex = rex; |
527 |
} |
528 |
d.internalComplete(null, ex); |
529 |
} |
530 |
return true; |
531 |
} |
532 |
private static final long serialVersionUID = 5232453952276885070L; |
533 |
} |
534 |
|
535 |
/* ------------- Completions -------------- */ |
536 |
|
537 |
/** |
538 |
* Simple linked list nodes to record completions, used in |
539 |
* basically the same way as WaitNodes. (We separate nodes from |
540 |
* the Completions themselves mainly because for the And and Or |
541 |
* methods, the same Completion object resides in two lists.) |
542 |
*/ |
543 |
static final class CompletionNode { |
544 |
final Completion completion; |
545 |
volatile CompletionNode next; |
546 |
CompletionNode(Completion completion) { this.completion = completion; } |
547 |
} |
548 |
|
549 |
// Opportunistically subclass AtomicInteger to use compareAndSet to claim. |
550 |
abstract static class Completion extends AtomicInteger implements Runnable { |
551 |
} |
552 |
|
553 |
static final class ApplyCompletion<T,U> extends Completion { |
554 |
final CompletableFuture<? extends T> src; |
555 |
final Function<? super T,? extends U> fn; |
556 |
final CompletableFuture<U> dst; |
557 |
final Executor executor; |
558 |
ApplyCompletion(CompletableFuture<? extends T> src, |
559 |
Function<? super T,? extends U> fn, |
560 |
CompletableFuture<U> dst, Executor executor) { |
561 |
this.src = src; this.fn = fn; this.dst = dst; |
562 |
this.executor = executor; |
563 |
} |
564 |
public final void run() { |
565 |
final CompletableFuture<? extends T> a; |
566 |
final Function<? super T,? extends U> fn; |
567 |
final CompletableFuture<U> dst; |
568 |
Object r; T t; Throwable ex; |
569 |
if ((dst = this.dst) != null && |
570 |
(fn = this.fn) != null && |
571 |
(a = this.src) != null && |
572 |
(r = a.result) != null && |
573 |
compareAndSet(0, 1)) { |
574 |
if (r instanceof AltResult) { |
575 |
ex = ((AltResult)r).ex; |
576 |
t = null; |
577 |
} |
578 |
else { |
579 |
ex = null; |
580 |
@SuppressWarnings("unchecked") T tr = (T) r; |
581 |
t = tr; |
582 |
} |
583 |
Executor e = executor; |
584 |
U u = null; |
585 |
if (ex == null) { |
586 |
try { |
587 |
if (e != null) |
588 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
589 |
else |
590 |
u = fn.apply(t); |
591 |
} catch (Throwable rex) { |
592 |
ex = rex; |
593 |
} |
594 |
} |
595 |
if (e == null || ex != null) |
596 |
dst.internalComplete(u, ex); |
597 |
} |
598 |
} |
599 |
private static final long serialVersionUID = 5232453952276885070L; |
600 |
} |
601 |
|
602 |
static final class AcceptCompletion<T> extends Completion { |
603 |
final CompletableFuture<? extends T> src; |
604 |
final Consumer<? super T> fn; |
605 |
final CompletableFuture<Void> dst; |
606 |
final Executor executor; |
607 |
AcceptCompletion(CompletableFuture<? extends T> src, |
608 |
Consumer<? super T> fn, |
609 |
CompletableFuture<Void> dst, Executor executor) { |
610 |
this.src = src; this.fn = fn; this.dst = dst; |
611 |
this.executor = executor; |
612 |
} |
613 |
public final void run() { |
614 |
final CompletableFuture<? extends T> a; |
615 |
final Consumer<? super T> fn; |
616 |
final CompletableFuture<Void> dst; |
617 |
Object r; T t; Throwable ex; |
618 |
if ((dst = this.dst) != null && |
619 |
(fn = this.fn) != null && |
620 |
(a = this.src) != null && |
621 |
(r = a.result) != null && |
622 |
compareAndSet(0, 1)) { |
623 |
if (r instanceof AltResult) { |
624 |
ex = ((AltResult)r).ex; |
625 |
t = null; |
626 |
} |
627 |
else { |
628 |
ex = null; |
629 |
@SuppressWarnings("unchecked") T tr = (T) r; |
630 |
t = tr; |
631 |
} |
632 |
Executor e = executor; |
633 |
if (ex == null) { |
634 |
try { |
635 |
if (e != null) |
636 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
637 |
else |
638 |
fn.accept(t); |
639 |
} catch (Throwable rex) { |
640 |
ex = rex; |
641 |
} |
642 |
} |
643 |
if (e == null || ex != null) |
644 |
dst.internalComplete(null, ex); |
645 |
} |
646 |
} |
647 |
private static final long serialVersionUID = 5232453952276885070L; |
648 |
} |
649 |
|
650 |
static final class RunCompletion<T> extends Completion { |
651 |
final CompletableFuture<? extends T> src; |
652 |
final Runnable fn; |
653 |
final CompletableFuture<Void> dst; |
654 |
final Executor executor; |
655 |
RunCompletion(CompletableFuture<? extends T> src, |
656 |
Runnable fn, |
657 |
CompletableFuture<Void> dst, |
658 |
Executor executor) { |
659 |
this.src = src; this.fn = fn; this.dst = dst; |
660 |
this.executor = executor; |
661 |
} |
662 |
public final void run() { |
663 |
final CompletableFuture<? extends T> a; |
664 |
final Runnable fn; |
665 |
final CompletableFuture<Void> dst; |
666 |
Object r; Throwable ex; |
667 |
if ((dst = this.dst) != null && |
668 |
(fn = this.fn) != null && |
669 |
(a = this.src) != null && |
670 |
(r = a.result) != null && |
671 |
compareAndSet(0, 1)) { |
672 |
if (r instanceof AltResult) |
673 |
ex = ((AltResult)r).ex; |
674 |
else |
675 |
ex = null; |
676 |
Executor e = executor; |
677 |
if (ex == null) { |
678 |
try { |
679 |
if (e != null) |
680 |
e.execute(new AsyncRun(fn, dst)); |
681 |
else |
682 |
fn.run(); |
683 |
} catch (Throwable rex) { |
684 |
ex = rex; |
685 |
} |
686 |
} |
687 |
if (e == null || ex != null) |
688 |
dst.internalComplete(null, ex); |
689 |
} |
690 |
} |
691 |
private static final long serialVersionUID = 5232453952276885070L; |
692 |
} |
693 |
|
694 |
static final class BiApplyCompletion<T,U,V> extends Completion { |
695 |
final CompletableFuture<? extends T> src; |
696 |
final CompletableFuture<? extends U> snd; |
697 |
final BiFunction<? super T,? super U,? extends V> fn; |
698 |
final CompletableFuture<V> dst; |
699 |
final Executor executor; |
700 |
BiApplyCompletion(CompletableFuture<? extends T> src, |
701 |
CompletableFuture<? extends U> snd, |
702 |
BiFunction<? super T,? super U,? extends V> fn, |
703 |
CompletableFuture<V> dst, Executor executor) { |
704 |
this.src = src; this.snd = snd; |
705 |
this.fn = fn; this.dst = dst; |
706 |
this.executor = executor; |
707 |
} |
708 |
public final void run() { |
709 |
final CompletableFuture<? extends T> a; |
710 |
final CompletableFuture<? extends U> b; |
711 |
final BiFunction<? super T,? super U,? extends V> fn; |
712 |
final CompletableFuture<V> dst; |
713 |
Object r, s; T t; U u; Throwable ex; |
714 |
if ((dst = this.dst) != null && |
715 |
(fn = this.fn) != null && |
716 |
(a = this.src) != null && |
717 |
(r = a.result) != null && |
718 |
(b = this.snd) != null && |
719 |
(s = b.result) != null && |
720 |
compareAndSet(0, 1)) { |
721 |
if (r instanceof AltResult) { |
722 |
ex = ((AltResult)r).ex; |
723 |
t = null; |
724 |
} |
725 |
else { |
726 |
ex = null; |
727 |
@SuppressWarnings("unchecked") T tr = (T) r; |
728 |
t = tr; |
729 |
} |
730 |
if (ex != null) |
731 |
u = null; |
732 |
else if (s instanceof AltResult) { |
733 |
ex = ((AltResult)s).ex; |
734 |
u = null; |
735 |
} |
736 |
else { |
737 |
@SuppressWarnings("unchecked") U us = (U) s; |
738 |
u = us; |
739 |
} |
740 |
Executor e = executor; |
741 |
V v = null; |
742 |
if (ex == null) { |
743 |
try { |
744 |
if (e != null) |
745 |
e.execute(new AsyncBiApply<T,U,V>(t, u, fn, dst)); |
746 |
else |
747 |
v = fn.apply(t, u); |
748 |
} catch (Throwable rex) { |
749 |
ex = rex; |
750 |
} |
751 |
} |
752 |
if (e == null || ex != null) |
753 |
dst.internalComplete(v, ex); |
754 |
} |
755 |
} |
756 |
private static final long serialVersionUID = 5232453952276885070L; |
757 |
} |
758 |
|
759 |
static final class BiAcceptCompletion<T,U> extends Completion { |
760 |
final CompletableFuture<? extends T> src; |
761 |
final CompletableFuture<? extends U> snd; |
762 |
final BiConsumer<? super T,? super U> fn; |
763 |
final CompletableFuture<Void> dst; |
764 |
final Executor executor; |
765 |
BiAcceptCompletion(CompletableFuture<? extends T> src, |
766 |
CompletableFuture<? extends U> snd, |
767 |
BiConsumer<? super T,? super U> fn, |
768 |
CompletableFuture<Void> dst, Executor executor) { |
769 |
this.src = src; this.snd = snd; |
770 |
this.fn = fn; this.dst = dst; |
771 |
this.executor = executor; |
772 |
} |
773 |
public final void run() { |
774 |
final CompletableFuture<? extends T> a; |
775 |
final CompletableFuture<? extends U> b; |
776 |
final BiConsumer<? super T,? super U> fn; |
777 |
final CompletableFuture<Void> dst; |
778 |
Object r, s; T t; U u; Throwable ex; |
779 |
if ((dst = this.dst) != null && |
780 |
(fn = this.fn) != null && |
781 |
(a = this.src) != null && |
782 |
(r = a.result) != null && |
783 |
(b = this.snd) != null && |
784 |
(s = b.result) != null && |
785 |
compareAndSet(0, 1)) { |
786 |
if (r instanceof AltResult) { |
787 |
ex = ((AltResult)r).ex; |
788 |
t = null; |
789 |
} |
790 |
else { |
791 |
ex = null; |
792 |
@SuppressWarnings("unchecked") T tr = (T) r; |
793 |
t = tr; |
794 |
} |
795 |
if (ex != null) |
796 |
u = null; |
797 |
else if (s instanceof AltResult) { |
798 |
ex = ((AltResult)s).ex; |
799 |
u = null; |
800 |
} |
801 |
else { |
802 |
@SuppressWarnings("unchecked") U us = (U) s; |
803 |
u = us; |
804 |
} |
805 |
Executor e = executor; |
806 |
if (ex == null) { |
807 |
try { |
808 |
if (e != null) |
809 |
e.execute(new AsyncBiAccept<T,U>(t, u, fn, dst)); |
810 |
else |
811 |
fn.accept(t, u); |
812 |
} catch (Throwable rex) { |
813 |
ex = rex; |
814 |
} |
815 |
} |
816 |
if (e == null || ex != null) |
817 |
dst.internalComplete(null, ex); |
818 |
} |
819 |
} |
820 |
private static final long serialVersionUID = 5232453952276885070L; |
821 |
} |
822 |
|
823 |
static final class BiRunCompletion<T> extends Completion { |
824 |
final CompletableFuture<? extends T> src; |
825 |
final CompletableFuture<?> snd; |
826 |
final Runnable fn; |
827 |
final CompletableFuture<Void> dst; |
828 |
final Executor executor; |
829 |
BiRunCompletion(CompletableFuture<? extends T> src, |
830 |
CompletableFuture<?> snd, |
831 |
Runnable fn, |
832 |
CompletableFuture<Void> dst, Executor executor) { |
833 |
this.src = src; this.snd = snd; |
834 |
this.fn = fn; this.dst = dst; |
835 |
this.executor = executor; |
836 |
} |
837 |
public final void run() { |
838 |
final CompletableFuture<? extends T> a; |
839 |
final CompletableFuture<?> b; |
840 |
final Runnable fn; |
841 |
final CompletableFuture<Void> dst; |
842 |
Object r, s; Throwable ex; |
843 |
if ((dst = this.dst) != null && |
844 |
(fn = this.fn) != null && |
845 |
(a = this.src) != null && |
846 |
(r = a.result) != null && |
847 |
(b = this.snd) != null && |
848 |
(s = b.result) != null && |
849 |
compareAndSet(0, 1)) { |
850 |
if (r instanceof AltResult) |
851 |
ex = ((AltResult)r).ex; |
852 |
else |
853 |
ex = null; |
854 |
if (ex == null && (s instanceof AltResult)) |
855 |
ex = ((AltResult)s).ex; |
856 |
Executor e = executor; |
857 |
if (ex == null) { |
858 |
try { |
859 |
if (e != null) |
860 |
e.execute(new AsyncRun(fn, dst)); |
861 |
else |
862 |
fn.run(); |
863 |
} catch (Throwable rex) { |
864 |
ex = rex; |
865 |
} |
866 |
} |
867 |
if (e == null || ex != null) |
868 |
dst.internalComplete(null, ex); |
869 |
} |
870 |
} |
871 |
private static final long serialVersionUID = 5232453952276885070L; |
872 |
} |
873 |
|
874 |
static final class OrApplyCompletion<T,U> extends Completion { |
875 |
final CompletableFuture<? extends T> src; |
876 |
final CompletableFuture<? extends T> snd; |
877 |
final Function<? super T,? extends U> fn; |
878 |
final CompletableFuture<U> dst; |
879 |
final Executor executor; |
880 |
OrApplyCompletion(CompletableFuture<? extends T> src, |
881 |
CompletableFuture<? extends T> snd, |
882 |
Function<? super T,? extends U> fn, |
883 |
CompletableFuture<U> dst, Executor executor) { |
884 |
this.src = src; this.snd = snd; |
885 |
this.fn = fn; this.dst = dst; |
886 |
this.executor = executor; |
887 |
} |
888 |
public final void run() { |
889 |
final CompletableFuture<? extends T> a; |
890 |
final CompletableFuture<? extends T> b; |
891 |
final Function<? super T,? extends U> fn; |
892 |
final CompletableFuture<U> dst; |
893 |
Object r; T t; Throwable ex; |
894 |
if ((dst = this.dst) != null && |
895 |
(fn = this.fn) != null && |
896 |
(((a = this.src) != null && (r = a.result) != null) || |
897 |
((b = this.snd) != null && (r = b.result) != null)) && |
898 |
compareAndSet(0, 1)) { |
899 |
if (r instanceof AltResult) { |
900 |
ex = ((AltResult)r).ex; |
901 |
t = null; |
902 |
} |
903 |
else { |
904 |
ex = null; |
905 |
@SuppressWarnings("unchecked") T tr = (T) r; |
906 |
t = tr; |
907 |
} |
908 |
Executor e = executor; |
909 |
U u = null; |
910 |
if (ex == null) { |
911 |
try { |
912 |
if (e != null) |
913 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
914 |
else |
915 |
u = fn.apply(t); |
916 |
} catch (Throwable rex) { |
917 |
ex = rex; |
918 |
} |
919 |
} |
920 |
if (e == null || ex != null) |
921 |
dst.internalComplete(u, ex); |
922 |
} |
923 |
} |
924 |
private static final long serialVersionUID = 5232453952276885070L; |
925 |
} |
926 |
|
927 |
static final class OrAcceptCompletion<T> extends Completion { |
928 |
final CompletableFuture<? extends T> src; |
929 |
final CompletableFuture<? extends T> snd; |
930 |
final Consumer<? super T> fn; |
931 |
final CompletableFuture<Void> dst; |
932 |
final Executor executor; |
933 |
OrAcceptCompletion(CompletableFuture<? extends T> src, |
934 |
CompletableFuture<? extends T> snd, |
935 |
Consumer<? super T> fn, |
936 |
CompletableFuture<Void> dst, Executor executor) { |
937 |
this.src = src; this.snd = snd; |
938 |
this.fn = fn; this.dst = dst; |
939 |
this.executor = executor; |
940 |
} |
941 |
public final void run() { |
942 |
final CompletableFuture<? extends T> a; |
943 |
final CompletableFuture<? extends T> b; |
944 |
final Consumer<? super T> fn; |
945 |
final CompletableFuture<Void> dst; |
946 |
Object r; T t; Throwable ex; |
947 |
if ((dst = this.dst) != null && |
948 |
(fn = this.fn) != null && |
949 |
(((a = this.src) != null && (r = a.result) != null) || |
950 |
((b = this.snd) != null && (r = b.result) != null)) && |
951 |
compareAndSet(0, 1)) { |
952 |
if (r instanceof AltResult) { |
953 |
ex = ((AltResult)r).ex; |
954 |
t = null; |
955 |
} |
956 |
else { |
957 |
ex = null; |
958 |
@SuppressWarnings("unchecked") T tr = (T) r; |
959 |
t = tr; |
960 |
} |
961 |
Executor e = executor; |
962 |
if (ex == null) { |
963 |
try { |
964 |
if (e != null) |
965 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
966 |
else |
967 |
fn.accept(t); |
968 |
} catch (Throwable rex) { |
969 |
ex = rex; |
970 |
} |
971 |
} |
972 |
if (e == null || ex != null) |
973 |
dst.internalComplete(null, ex); |
974 |
} |
975 |
} |
976 |
private static final long serialVersionUID = 5232453952276885070L; |
977 |
} |
978 |
|
979 |
static final class OrRunCompletion<T> extends Completion { |
980 |
final CompletableFuture<? extends T> src; |
981 |
final CompletableFuture<?> snd; |
982 |
final Runnable fn; |
983 |
final CompletableFuture<Void> dst; |
984 |
final Executor executor; |
985 |
OrRunCompletion(CompletableFuture<? extends T> src, |
986 |
CompletableFuture<?> snd, |
987 |
Runnable fn, |
988 |
CompletableFuture<Void> dst, Executor executor) { |
989 |
this.src = src; this.snd = snd; |
990 |
this.fn = fn; this.dst = dst; |
991 |
this.executor = executor; |
992 |
} |
993 |
public final void run() { |
994 |
final CompletableFuture<? extends T> a; |
995 |
final CompletableFuture<?> b; |
996 |
final Runnable fn; |
997 |
final CompletableFuture<Void> dst; |
998 |
Object r; Throwable ex; |
999 |
if ((dst = this.dst) != null && |
1000 |
(fn = this.fn) != null && |
1001 |
(((a = this.src) != null && (r = a.result) != null) || |
1002 |
((b = this.snd) != null && (r = b.result) != null)) && |
1003 |
compareAndSet(0, 1)) { |
1004 |
if (r instanceof AltResult) |
1005 |
ex = ((AltResult)r).ex; |
1006 |
else |
1007 |
ex = null; |
1008 |
Executor e = executor; |
1009 |
if (ex == null) { |
1010 |
try { |
1011 |
if (e != null) |
1012 |
e.execute(new AsyncRun(fn, dst)); |
1013 |
else |
1014 |
fn.run(); |
1015 |
} catch (Throwable rex) { |
1016 |
ex = rex; |
1017 |
} |
1018 |
} |
1019 |
if (e == null || ex != null) |
1020 |
dst.internalComplete(null, ex); |
1021 |
} |
1022 |
} |
1023 |
private static final long serialVersionUID = 5232453952276885070L; |
1024 |
} |
1025 |
|
1026 |
static final class ExceptionCompletion<T> extends Completion { |
1027 |
final CompletableFuture<? extends T> src; |
1028 |
final Function<? super Throwable, ? extends T> fn; |
1029 |
final CompletableFuture<T> dst; |
1030 |
ExceptionCompletion(CompletableFuture<? extends T> src, |
1031 |
Function<? super Throwable, ? extends T> fn, |
1032 |
CompletableFuture<T> dst) { |
1033 |
this.src = src; this.fn = fn; this.dst = dst; |
1034 |
} |
1035 |
public final void run() { |
1036 |
final CompletableFuture<? extends T> a; |
1037 |
final Function<? super Throwable, ? extends T> fn; |
1038 |
final CompletableFuture<T> dst; |
1039 |
Object r; T t = null; Throwable ex, dx = null; |
1040 |
if ((dst = this.dst) != null && |
1041 |
(fn = this.fn) != null && |
1042 |
(a = this.src) != null && |
1043 |
(r = a.result) != null && |
1044 |
compareAndSet(0, 1)) { |
1045 |
if ((r instanceof AltResult) && |
1046 |
(ex = ((AltResult)r).ex) != null) { |
1047 |
try { |
1048 |
t = fn.apply(ex); |
1049 |
} catch (Throwable rex) { |
1050 |
dx = rex; |
1051 |
} |
1052 |
} |
1053 |
else { |
1054 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1055 |
t = tr; |
1056 |
} |
1057 |
dst.internalComplete(t, dx); |
1058 |
} |
1059 |
} |
1060 |
private static final long serialVersionUID = 5232453952276885070L; |
1061 |
} |
1062 |
|
1063 |
static final class ThenCopy<T> extends Completion { |
1064 |
final CompletableFuture<? extends T> src; |
1065 |
final CompletableFuture<T> dst; |
1066 |
ThenCopy(CompletableFuture<? extends T> src, |
1067 |
CompletableFuture<T> dst) { |
1068 |
this.src = src; this.dst = dst; |
1069 |
} |
1070 |
public final void run() { |
1071 |
final CompletableFuture<? extends T> a; |
1072 |
final CompletableFuture<T> dst; |
1073 |
Object r; Object t; Throwable ex; |
1074 |
if ((dst = this.dst) != null && |
1075 |
(a = this.src) != null && |
1076 |
(r = a.result) != null && |
1077 |
compareAndSet(0, 1)) { |
1078 |
if (r instanceof AltResult) { |
1079 |
ex = ((AltResult)r).ex; |
1080 |
t = null; |
1081 |
} |
1082 |
else { |
1083 |
ex = null; |
1084 |
t = r; |
1085 |
} |
1086 |
dst.internalComplete(t, ex); |
1087 |
} |
1088 |
} |
1089 |
private static final long serialVersionUID = 5232453952276885070L; |
1090 |
} |
1091 |
|
1092 |
static final class HandleCompletion<T,U> extends Completion { |
1093 |
final CompletableFuture<? extends T> src; |
1094 |
final BiFunction<? super T, Throwable, ? extends U> fn; |
1095 |
final CompletableFuture<U> dst; |
1096 |
HandleCompletion(CompletableFuture<? extends T> src, |
1097 |
BiFunction<? super T, Throwable, ? extends U> fn, |
1098 |
final CompletableFuture<U> dst) { |
1099 |
this.src = src; this.fn = fn; this.dst = dst; |
1100 |
} |
1101 |
public final void run() { |
1102 |
final CompletableFuture<? extends T> a; |
1103 |
final BiFunction<? super T, Throwable, ? extends U> fn; |
1104 |
final CompletableFuture<U> dst; |
1105 |
Object r; T t; Throwable ex; |
1106 |
if ((dst = this.dst) != null && |
1107 |
(fn = this.fn) != null && |
1108 |
(a = this.src) != null && |
1109 |
(r = a.result) != null && |
1110 |
compareAndSet(0, 1)) { |
1111 |
if (r instanceof AltResult) { |
1112 |
ex = ((AltResult)r).ex; |
1113 |
t = null; |
1114 |
} |
1115 |
else { |
1116 |
ex = null; |
1117 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1118 |
t = tr; |
1119 |
} |
1120 |
U u = null; Throwable dx = null; |
1121 |
try { |
1122 |
u = fn.apply(t, ex); |
1123 |
} catch (Throwable rex) { |
1124 |
dx = rex; |
1125 |
} |
1126 |
dst.internalComplete(u, dx); |
1127 |
} |
1128 |
} |
1129 |
private static final long serialVersionUID = 5232453952276885070L; |
1130 |
} |
1131 |
|
1132 |
static final class ComposeCompletion<T,U> extends Completion { |
1133 |
final CompletableFuture<? extends T> src; |
1134 |
final Function<? super T, CompletableFuture<U>> fn; |
1135 |
final CompletableFuture<U> dst; |
1136 |
ComposeCompletion(CompletableFuture<? extends T> src, |
1137 |
Function<? super T, CompletableFuture<U>> fn, |
1138 |
final CompletableFuture<U> dst) { |
1139 |
this.src = src; this.fn = fn; this.dst = dst; |
1140 |
} |
1141 |
public final void run() { |
1142 |
final CompletableFuture<? extends T> a; |
1143 |
final Function<? super T, CompletableFuture<U>> fn; |
1144 |
final CompletableFuture<U> dst; |
1145 |
Object r; T t; Throwable ex; |
1146 |
if ((dst = this.dst) != null && |
1147 |
(fn = this.fn) != null && |
1148 |
(a = this.src) != null && |
1149 |
(r = a.result) != null && |
1150 |
compareAndSet(0, 1)) { |
1151 |
if (r instanceof AltResult) { |
1152 |
ex = ((AltResult)r).ex; |
1153 |
t = null; |
1154 |
} |
1155 |
else { |
1156 |
ex = null; |
1157 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1158 |
t = tr; |
1159 |
} |
1160 |
CompletableFuture<U> c = null; |
1161 |
U u = null; |
1162 |
boolean complete = false; |
1163 |
if (ex == null) { |
1164 |
try { |
1165 |
c = fn.apply(t); |
1166 |
} catch (Throwable rex) { |
1167 |
ex = rex; |
1168 |
} |
1169 |
} |
1170 |
if (ex != null || c == null) { |
1171 |
if (ex == null) |
1172 |
ex = new NullPointerException(); |
1173 |
} |
1174 |
else { |
1175 |
ThenCopy<U> d = null; |
1176 |
Object s; |
1177 |
if ((s = c.result) == null) { |
1178 |
CompletionNode p = new CompletionNode |
1179 |
(d = new ThenCopy<U>(c, dst)); |
1180 |
while ((s = c.result) == null) { |
1181 |
if (UNSAFE.compareAndSwapObject |
1182 |
(c, COMPLETIONS, p.next = c.completions, p)) |
1183 |
break; |
1184 |
} |
1185 |
} |
1186 |
if (s != null && (d == null || d.compareAndSet(0, 1))) { |
1187 |
complete = true; |
1188 |
if (s instanceof AltResult) { |
1189 |
ex = ((AltResult)s).ex; // no rewrap |
1190 |
u = null; |
1191 |
} |
1192 |
else { |
1193 |
@SuppressWarnings("unchecked") U us = (U) s; |
1194 |
u = us; |
1195 |
} |
1196 |
} |
1197 |
} |
1198 |
if (complete || ex != null) |
1199 |
dst.internalComplete(u, ex); |
1200 |
if (c != null) |
1201 |
c.helpPostComplete(); |
1202 |
} |
1203 |
} |
1204 |
private static final long serialVersionUID = 5232453952276885070L; |
1205 |
} |
1206 |
|
1207 |
// public methods |
1208 |
|
1209 |
/** |
1210 |
* Creates a new incomplete CompletableFuture. |
1211 |
*/ |
1212 |
public CompletableFuture() { |
1213 |
} |
1214 |
|
1215 |
/** |
1216 |
* Asynchronously executes in the {@link |
1217 |
* ForkJoinPool#commonPool()}, a task that completes the returned |
1218 |
* CompletableFuture with the result of the given Supplier. |
1219 |
* |
1220 |
* @param supplier a function returning the value to be used |
1221 |
* to complete the returned CompletableFuture |
1222 |
* @return the CompletableFuture |
1223 |
*/ |
1224 |
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier) { |
1225 |
if (supplier == null) throw new NullPointerException(); |
1226 |
CompletableFuture<U> f = new CompletableFuture<U>(); |
1227 |
ForkJoinPool.commonPool(). |
1228 |
execute((ForkJoinTask<?>)new AsyncSupply<U>(supplier, f)); |
1229 |
return f; |
1230 |
} |
1231 |
|
1232 |
/** |
1233 |
* Asynchronously executes using the given executor, a task that |
1234 |
* completes the returned CompletableFuture with the result of the |
1235 |
* given Supplier. |
1236 |
* |
1237 |
* @param supplier a function returning the value to be used |
1238 |
* to complete the returned CompletableFuture |
1239 |
* @param executor the executor to use for asynchronous execution |
1240 |
* @return the CompletableFuture |
1241 |
*/ |
1242 |
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier, |
1243 |
Executor executor) { |
1244 |
if (executor == null || supplier == null) |
1245 |
throw new NullPointerException(); |
1246 |
CompletableFuture<U> f = new CompletableFuture<U>(); |
1247 |
executor.execute(new AsyncSupply<U>(supplier, f)); |
1248 |
return f; |
1249 |
} |
1250 |
|
1251 |
/** |
1252 |
* Asynchronously executes in the {@link |
1253 |
* ForkJoinPool#commonPool()} a task that runs the given action, |
1254 |
* and then completes the returned CompletableFuture. |
1255 |
* |
1256 |
* @param runnable the action to run before completing the |
1257 |
* returned CompletableFuture |
1258 |
* @return the CompletableFuture |
1259 |
*/ |
1260 |
public static CompletableFuture<Void> runAsync(Runnable runnable) { |
1261 |
if (runnable == null) throw new NullPointerException(); |
1262 |
CompletableFuture<Void> f = new CompletableFuture<Void>(); |
1263 |
ForkJoinPool.commonPool(). |
1264 |
execute((ForkJoinTask<?>)new AsyncRun(runnable, f)); |
1265 |
return f; |
1266 |
} |
1267 |
|
1268 |
/** |
1269 |
* Asynchronously executes using the given executor, a task that |
1270 |
* runs the given action, and then completes the returned |
1271 |
* CompletableFuture. |
1272 |
* |
1273 |
* @param runnable the action to run before completing the |
1274 |
* returned CompletableFuture |
1275 |
* @param executor the executor to use for asynchronous execution |
1276 |
* @return the CompletableFuture |
1277 |
*/ |
1278 |
public static CompletableFuture<Void> runAsync(Runnable runnable, |
1279 |
Executor executor) { |
1280 |
if (executor == null || runnable == null) |
1281 |
throw new NullPointerException(); |
1282 |
CompletableFuture<Void> f = new CompletableFuture<Void>(); |
1283 |
executor.execute(new AsyncRun(runnable, f)); |
1284 |
return f; |
1285 |
} |
1286 |
|
1287 |
/** |
1288 |
* Returns {@code true} if completed in any fashion: normally, |
1289 |
* exceptionally, or via cancellation. |
1290 |
* |
1291 |
* @return {@code true} if completed |
1292 |
*/ |
1293 |
public boolean isDone() { |
1294 |
return result != null; |
1295 |
} |
1296 |
|
1297 |
/** |
1298 |
* Waits if necessary for the computation to complete, and then |
1299 |
* retrieves its result. |
1300 |
* |
1301 |
* @return the computed result |
1302 |
* @throws CancellationException if the computation was cancelled |
1303 |
* @throws ExecutionException if the computation threw an |
1304 |
* exception |
1305 |
* @throws InterruptedException if the current thread was interrupted |
1306 |
* while waiting |
1307 |
*/ |
1308 |
public T get() throws InterruptedException, ExecutionException { |
1309 |
Object r; Throwable ex, cause; |
1310 |
if ((r = result) == null && (r = waitingGet(true)) == null) |
1311 |
throw new InterruptedException(); |
1312 |
if (r instanceof AltResult) { |
1313 |
if ((ex = ((AltResult)r).ex) != null) { |
1314 |
if (ex instanceof CancellationException) |
1315 |
throw (CancellationException)ex; |
1316 |
if ((ex instanceof CompletionException) && |
1317 |
(cause = ex.getCause()) != null) |
1318 |
ex = cause; |
1319 |
throw new ExecutionException(ex); |
1320 |
} |
1321 |
return null; |
1322 |
} |
1323 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1324 |
return tr; |
1325 |
} |
1326 |
|
1327 |
/** |
1328 |
* Waits if necessary for at most the given time for completion, |
1329 |
* and then retrieves its result, if available. |
1330 |
* |
1331 |
* @param timeout the maximum time to wait |
1332 |
* @param unit the time unit of the timeout argument |
1333 |
* @return the computed result |
1334 |
* @throws CancellationException if the computation was cancelled |
1335 |
* @throws ExecutionException if the computation threw an |
1336 |
* exception |
1337 |
* @throws InterruptedException if the current thread was interrupted |
1338 |
* while waiting |
1339 |
* @throws TimeoutException if the wait timed out |
1340 |
*/ |
1341 |
public T get(long timeout, TimeUnit unit) |
1342 |
throws InterruptedException, ExecutionException, TimeoutException { |
1343 |
Object r; Throwable ex, cause; |
1344 |
long nanos = unit.toNanos(timeout); |
1345 |
if (Thread.interrupted()) |
1346 |
throw new InterruptedException(); |
1347 |
if ((r = result) == null) |
1348 |
r = timedAwaitDone(nanos); |
1349 |
if (r instanceof AltResult) { |
1350 |
if ((ex = ((AltResult)r).ex) != null) { |
1351 |
if (ex instanceof CancellationException) |
1352 |
throw (CancellationException)ex; |
1353 |
if ((ex instanceof CompletionException) && |
1354 |
(cause = ex.getCause()) != null) |
1355 |
ex = cause; |
1356 |
throw new ExecutionException(ex); |
1357 |
} |
1358 |
return null; |
1359 |
} |
1360 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1361 |
return tr; |
1362 |
} |
1363 |
|
1364 |
/** |
1365 |
* Returns the result value when complete, or throws an |
1366 |
* (unchecked) exception if completed exceptionally. To better |
1367 |
* conform with the use of common functional forms, if a |
1368 |
* computation involved in the completion of this |
1369 |
* CompletableFuture threw an exception, this method throws an |
1370 |
* (unchecked) {@link CompletionException} with the underlying |
1371 |
* exception as its cause. |
1372 |
* |
1373 |
* @return the result value |
1374 |
* @throws CancellationException if the computation was cancelled |
1375 |
* @throws CompletionException if a completion computation threw |
1376 |
* an exception |
1377 |
*/ |
1378 |
public T join() { |
1379 |
Object r; Throwable ex; |
1380 |
if ((r = result) == null) |
1381 |
r = waitingGet(false); |
1382 |
if (r instanceof AltResult) { |
1383 |
if ((ex = ((AltResult)r).ex) != null) { |
1384 |
if (ex instanceof CancellationException) |
1385 |
throw (CancellationException)ex; |
1386 |
if (ex instanceof CompletionException) |
1387 |
throw (CompletionException)ex; |
1388 |
throw new CompletionException(ex); |
1389 |
} |
1390 |
return null; |
1391 |
} |
1392 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1393 |
return tr; |
1394 |
} |
1395 |
|
1396 |
/** |
1397 |
* Returns the result value (or throws any encountered exception) |
1398 |
* if completed, else returns the given valueIfAbsent. |
1399 |
* |
1400 |
* @param valueIfAbsent the value to return if not completed |
1401 |
* @return the result value, if completed, else the given valueIfAbsent |
1402 |
* @throws CancellationException if the computation was cancelled |
1403 |
* @throws CompletionException if a completion computation threw |
1404 |
* an exception |
1405 |
*/ |
1406 |
public T getNow(T valueIfAbsent) { |
1407 |
Object r; Throwable ex; |
1408 |
if ((r = result) == null) |
1409 |
return valueIfAbsent; |
1410 |
if (r instanceof AltResult) { |
1411 |
if ((ex = ((AltResult)r).ex) != null) { |
1412 |
if (ex instanceof CancellationException) |
1413 |
throw (CancellationException)ex; |
1414 |
if (ex instanceof CompletionException) |
1415 |
throw (CompletionException)ex; |
1416 |
throw new CompletionException(ex); |
1417 |
} |
1418 |
return null; |
1419 |
} |
1420 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1421 |
return tr; |
1422 |
} |
1423 |
|
1424 |
/** |
1425 |
* If not already completed, sets the value returned by {@link |
1426 |
* #get()} and related methods to the given value. |
1427 |
* |
1428 |
* @param value the result value |
1429 |
* @return {@code true} if this invocation caused this CompletableFuture |
1430 |
* to transition to a completed state, else {@code false} |
1431 |
*/ |
1432 |
public boolean complete(T value) { |
1433 |
boolean triggered = result == null && |
1434 |
UNSAFE.compareAndSwapObject(this, RESULT, null, |
1435 |
value == null ? NIL : value); |
1436 |
postComplete(); |
1437 |
return triggered; |
1438 |
} |
1439 |
|
1440 |
/** |
1441 |
* If not already completed, causes invocations of {@link #get()} |
1442 |
* and related methods to throw the given exception. |
1443 |
* |
1444 |
* @param ex the exception |
1445 |
* @return {@code true} if this invocation caused this CompletableFuture |
1446 |
* to transition to a completed state, else {@code false} |
1447 |
*/ |
1448 |
public boolean completeExceptionally(Throwable ex) { |
1449 |
if (ex == null) throw new NullPointerException(); |
1450 |
boolean triggered = result == null && |
1451 |
UNSAFE.compareAndSwapObject(this, RESULT, null, new AltResult(ex)); |
1452 |
postComplete(); |
1453 |
return triggered; |
1454 |
} |
1455 |
|
1456 |
/** |
1457 |
* Creates and returns a CompletableFuture that is completed with |
1458 |
* the result of the given function of this CompletableFuture. |
1459 |
* If this CompletableFuture completes exceptionally, |
1460 |
* then the returned CompletableFuture also does so, |
1461 |
* with a CompletionException holding this exception as |
1462 |
* its cause. |
1463 |
* |
1464 |
* @param fn the function to use to compute the value of |
1465 |
* the returned CompletableFuture |
1466 |
* @return the new CompletableFuture |
1467 |
*/ |
1468 |
public <U> CompletableFuture<U> thenApply(Function<? super T,? extends U> fn) { |
1469 |
return doThenApply(fn, null); |
1470 |
} |
1471 |
|
1472 |
/** |
1473 |
* Creates and returns a CompletableFuture that is asynchronously |
1474 |
* completed using the {@link ForkJoinPool#commonPool()} with the |
1475 |
* result of the given function of this CompletableFuture. If |
1476 |
* this CompletableFuture completes exceptionally, then the |
1477 |
* returned CompletableFuture also does so, with a |
1478 |
* CompletionException holding this exception as its cause. |
1479 |
* |
1480 |
* @param fn the function to use to compute the value of |
1481 |
* the returned CompletableFuture |
1482 |
* @return the new CompletableFuture |
1483 |
*/ |
1484 |
public <U> CompletableFuture<U> thenApplyAsync(Function<? super T,? extends U> fn) { |
1485 |
return doThenApply(fn, ForkJoinPool.commonPool()); |
1486 |
} |
1487 |
|
1488 |
/** |
1489 |
* Creates and returns a CompletableFuture that is asynchronously |
1490 |
* completed using the given executor with the result of the given |
1491 |
* function of this CompletableFuture. If this CompletableFuture |
1492 |
* completes exceptionally, then the returned CompletableFuture |
1493 |
* also does so, with a CompletionException holding this exception as |
1494 |
* its cause. |
1495 |
* |
1496 |
* @param fn the function to use to compute the value of |
1497 |
* the returned CompletableFuture |
1498 |
* @param executor the executor to use for asynchronous execution |
1499 |
* @return the new CompletableFuture |
1500 |
*/ |
1501 |
public <U> CompletableFuture<U> thenApplyAsync(Function<? super T,? extends U> fn, |
1502 |
Executor executor) { |
1503 |
if (executor == null) throw new NullPointerException(); |
1504 |
return doThenApply(fn, executor); |
1505 |
} |
1506 |
|
1507 |
private <U> CompletableFuture<U> doThenApply(Function<? super T,? extends U> fn, |
1508 |
Executor e) { |
1509 |
if (fn == null) throw new NullPointerException(); |
1510 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
1511 |
ApplyCompletion<T,U> d = null; |
1512 |
Object r; |
1513 |
if ((r = result) == null) { |
1514 |
CompletionNode p = new CompletionNode |
1515 |
(d = new ApplyCompletion<T,U>(this, fn, dst, e)); |
1516 |
while ((r = result) == null) { |
1517 |
if (UNSAFE.compareAndSwapObject |
1518 |
(this, COMPLETIONS, p.next = completions, p)) |
1519 |
break; |
1520 |
} |
1521 |
} |
1522 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1523 |
T t; Throwable ex; |
1524 |
if (r instanceof AltResult) { |
1525 |
ex = ((AltResult)r).ex; |
1526 |
t = null; |
1527 |
} |
1528 |
else { |
1529 |
ex = null; |
1530 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1531 |
t = tr; |
1532 |
} |
1533 |
U u = null; |
1534 |
if (ex == null) { |
1535 |
try { |
1536 |
if (e != null) |
1537 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
1538 |
else |
1539 |
u = fn.apply(t); |
1540 |
} catch (Throwable rex) { |
1541 |
ex = rex; |
1542 |
} |
1543 |
} |
1544 |
if (e == null || ex != null) |
1545 |
dst.internalComplete(u, ex); |
1546 |
} |
1547 |
helpPostComplete(); |
1548 |
return dst; |
1549 |
} |
1550 |
|
1551 |
/** |
1552 |
* Creates and returns a CompletableFuture that is completed after |
1553 |
* performing the given action with this CompletableFuture's |
1554 |
* result when it completes. If this CompletableFuture |
1555 |
* completes exceptionally, then the returned CompletableFuture |
1556 |
* also does so, with a CompletionException holding this exception as |
1557 |
* its cause. |
1558 |
* |
1559 |
* @param block the action to perform before completing the |
1560 |
* returned CompletableFuture |
1561 |
* @return the new CompletableFuture |
1562 |
*/ |
1563 |
public CompletableFuture<Void> thenAccept(Consumer<? super T> block) { |
1564 |
return doThenAccept(block, null); |
1565 |
} |
1566 |
|
1567 |
/** |
1568 |
* Creates and returns a CompletableFuture that is asynchronously |
1569 |
* completed using the {@link ForkJoinPool#commonPool()} with this |
1570 |
* CompletableFuture's result when it completes. If this |
1571 |
* CompletableFuture completes exceptionally, then the returned |
1572 |
* CompletableFuture also does so, with a CompletionException holding |
1573 |
* this exception as its cause. |
1574 |
* |
1575 |
* @param block the action to perform before completing the |
1576 |
* returned CompletableFuture |
1577 |
* @return the new CompletableFuture |
1578 |
*/ |
1579 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> block) { |
1580 |
return doThenAccept(block, ForkJoinPool.commonPool()); |
1581 |
} |
1582 |
|
1583 |
/** |
1584 |
* Creates and returns a CompletableFuture that is asynchronously |
1585 |
* completed using the given executor with this |
1586 |
* CompletableFuture's result when it completes. If this |
1587 |
* CompletableFuture completes exceptionally, then the returned |
1588 |
* CompletableFuture also does so, with a CompletionException holding |
1589 |
* this exception as its cause. |
1590 |
* |
1591 |
* @param block the action to perform before completing the |
1592 |
* returned CompletableFuture |
1593 |
* @param executor the executor to use for asynchronous execution |
1594 |
* @return the new CompletableFuture |
1595 |
*/ |
1596 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> block, |
1597 |
Executor executor) { |
1598 |
if (executor == null) throw new NullPointerException(); |
1599 |
return doThenAccept(block, executor); |
1600 |
} |
1601 |
|
1602 |
private CompletableFuture<Void> doThenAccept(Consumer<? super T> fn, |
1603 |
Executor e) { |
1604 |
if (fn == null) throw new NullPointerException(); |
1605 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1606 |
AcceptCompletion<T> d = null; |
1607 |
Object r; |
1608 |
if ((r = result) == null) { |
1609 |
CompletionNode p = new CompletionNode |
1610 |
(d = new AcceptCompletion<T>(this, fn, dst, e)); |
1611 |
while ((r = result) == null) { |
1612 |
if (UNSAFE.compareAndSwapObject |
1613 |
(this, COMPLETIONS, p.next = completions, p)) |
1614 |
break; |
1615 |
} |
1616 |
} |
1617 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1618 |
T t; Throwable ex; |
1619 |
if (r instanceof AltResult) { |
1620 |
ex = ((AltResult)r).ex; |
1621 |
t = null; |
1622 |
} |
1623 |
else { |
1624 |
ex = null; |
1625 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1626 |
t = tr; |
1627 |
} |
1628 |
if (ex == null) { |
1629 |
try { |
1630 |
if (e != null) |
1631 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
1632 |
else |
1633 |
fn.accept(t); |
1634 |
} catch (Throwable rex) { |
1635 |
ex = rex; |
1636 |
} |
1637 |
} |
1638 |
if (e == null || ex != null) |
1639 |
dst.internalComplete(null, ex); |
1640 |
} |
1641 |
helpPostComplete(); |
1642 |
return dst; |
1643 |
} |
1644 |
|
1645 |
/** |
1646 |
* Creates and returns a CompletableFuture that is completed after |
1647 |
* performing the given action when this CompletableFuture |
1648 |
* completes. If this CompletableFuture completes exceptionally, |
1649 |
* then the returned CompletableFuture also does so, with a |
1650 |
* CompletionException holding this exception as its cause. |
1651 |
* |
1652 |
* @param action the action to perform before completing the |
1653 |
* returned CompletableFuture |
1654 |
* @return the new CompletableFuture |
1655 |
*/ |
1656 |
public CompletableFuture<Void> thenRun(Runnable action) { |
1657 |
return doThenRun(action, null); |
1658 |
} |
1659 |
|
1660 |
/** |
1661 |
* Creates and returns a CompletableFuture that is asynchronously |
1662 |
* completed using the {@link ForkJoinPool#commonPool()} after |
1663 |
* performing the given action when this CompletableFuture |
1664 |
* completes. If this CompletableFuture completes exceptionally, |
1665 |
* then the returned CompletableFuture also does so, with a |
1666 |
* CompletionException holding this exception as its cause. |
1667 |
* |
1668 |
* @param action the action to perform before completing the |
1669 |
* returned CompletableFuture |
1670 |
* @return the new CompletableFuture |
1671 |
*/ |
1672 |
public CompletableFuture<Void> thenRunAsync(Runnable action) { |
1673 |
return doThenRun(action, ForkJoinPool.commonPool()); |
1674 |
} |
1675 |
|
1676 |
/** |
1677 |
* Creates and returns a CompletableFuture that is asynchronously |
1678 |
* completed using the given executor after performing the given |
1679 |
* action when this CompletableFuture completes. If this |
1680 |
* CompletableFuture completes exceptionally, then the returned |
1681 |
* CompletableFuture also does so, with a CompletionException holding |
1682 |
* this exception as its cause. |
1683 |
* |
1684 |
* @param action the action to perform before completing the |
1685 |
* returned CompletableFuture |
1686 |
* @param executor the executor to use for asynchronous execution |
1687 |
* @return the new CompletableFuture |
1688 |
*/ |
1689 |
public CompletableFuture<Void> thenRunAsync(Runnable action, |
1690 |
Executor executor) { |
1691 |
if (executor == null) throw new NullPointerException(); |
1692 |
return doThenRun(action, executor); |
1693 |
} |
1694 |
|
1695 |
private CompletableFuture<Void> doThenRun(Runnable action, |
1696 |
Executor e) { |
1697 |
if (action == null) throw new NullPointerException(); |
1698 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1699 |
RunCompletion<T> d = null; |
1700 |
Object r; |
1701 |
if ((r = result) == null) { |
1702 |
CompletionNode p = new CompletionNode |
1703 |
(d = new RunCompletion<T>(this, action, dst, e)); |
1704 |
while ((r = result) == null) { |
1705 |
if (UNSAFE.compareAndSwapObject |
1706 |
(this, COMPLETIONS, p.next = completions, p)) |
1707 |
break; |
1708 |
} |
1709 |
} |
1710 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1711 |
Throwable ex; |
1712 |
if (r instanceof AltResult) |
1713 |
ex = ((AltResult)r).ex; |
1714 |
else |
1715 |
ex = null; |
1716 |
if (ex == null) { |
1717 |
try { |
1718 |
if (e != null) |
1719 |
e.execute(new AsyncRun(action, dst)); |
1720 |
else |
1721 |
action.run(); |
1722 |
} catch (Throwable rex) { |
1723 |
ex = rex; |
1724 |
} |
1725 |
} |
1726 |
if (e == null || ex != null) |
1727 |
dst.internalComplete(null, ex); |
1728 |
} |
1729 |
helpPostComplete(); |
1730 |
return dst; |
1731 |
} |
1732 |
|
1733 |
/** |
1734 |
* Creates and returns a CompletableFuture that is completed with |
1735 |
* the result of the given function of this and the other given |
1736 |
* CompletableFuture's results when both complete. If this or |
1737 |
* the other CompletableFuture complete exceptionally, then the |
1738 |
* returned CompletableFuture also does so, with a |
1739 |
* CompletionException holding the exception as its cause. |
1740 |
* |
1741 |
* @param other the other CompletableFuture |
1742 |
* @param fn the function to use to compute the value of |
1743 |
* the returned CompletableFuture |
1744 |
* @return the new CompletableFuture |
1745 |
*/ |
1746 |
public <U,V> CompletableFuture<V> thenCombine(CompletableFuture<? extends U> other, |
1747 |
BiFunction<? super T,? super U,? extends V> fn) { |
1748 |
return doThenBiApply(other, fn, null); |
1749 |
} |
1750 |
|
1751 |
/** |
1752 |
* Creates and returns a CompletableFuture that is asynchronously |
1753 |
* completed using the {@link ForkJoinPool#commonPool()} with |
1754 |
* the result of the given function of this and the other given |
1755 |
* CompletableFuture's results when both complete. If this or |
1756 |
* the other CompletableFuture complete exceptionally, then the |
1757 |
* returned CompletableFuture also does so, with a |
1758 |
* CompletionException holding the exception as its cause. |
1759 |
* |
1760 |
* @param other the other CompletableFuture |
1761 |
* @param fn the function to use to compute the value of |
1762 |
* the returned CompletableFuture |
1763 |
* @return the new CompletableFuture |
1764 |
*/ |
1765 |
public <U,V> CompletableFuture<V> thenCombineAsync(CompletableFuture<? extends U> other, |
1766 |
BiFunction<? super T,? super U,? extends V> fn) { |
1767 |
return doThenBiApply(other, fn, ForkJoinPool.commonPool()); |
1768 |
} |
1769 |
|
1770 |
/** |
1771 |
* Creates and returns a CompletableFuture that is |
1772 |
* asynchronously completed using the given executor with the |
1773 |
* result of the given function of this and the other given |
1774 |
* CompletableFuture's results when both complete. If this or |
1775 |
* the other CompletableFuture complete exceptionally, then the |
1776 |
* returned CompletableFuture also does so, with a |
1777 |
* CompletionException holding the exception as its cause. |
1778 |
* |
1779 |
* @param other the other CompletableFuture |
1780 |
* @param fn the function to use to compute the value of |
1781 |
* the returned CompletableFuture |
1782 |
* @param executor the executor to use for asynchronous execution |
1783 |
* @return the new CompletableFuture |
1784 |
*/ |
1785 |
|
1786 |
public <U,V> CompletableFuture<V> thenCombineAsync(CompletableFuture<? extends U> other, |
1787 |
BiFunction<? super T,? super U,? extends V> fn, |
1788 |
Executor executor) { |
1789 |
if (executor == null) throw new NullPointerException(); |
1790 |
return doThenBiApply(other, fn, executor); |
1791 |
} |
1792 |
|
1793 |
private <U,V> CompletableFuture<V> doThenBiApply(CompletableFuture<? extends U> other, |
1794 |
BiFunction<? super T,? super U,? extends V> fn, |
1795 |
Executor e) { |
1796 |
if (other == null || fn == null) throw new NullPointerException(); |
1797 |
CompletableFuture<V> dst = new CompletableFuture<V>(); |
1798 |
BiApplyCompletion<T,U,V> d = null; |
1799 |
Object r, s = null; |
1800 |
if ((r = result) == null || (s = other.result) == null) { |
1801 |
d = new BiApplyCompletion<T,U,V>(this, other, fn, dst, e); |
1802 |
CompletionNode q = null, p = new CompletionNode(d); |
1803 |
while ((r == null && (r = result) == null) || |
1804 |
(s == null && (s = other.result) == null)) { |
1805 |
if (q != null) { |
1806 |
if (s != null || |
1807 |
UNSAFE.compareAndSwapObject |
1808 |
(other, COMPLETIONS, q.next = other.completions, q)) |
1809 |
break; |
1810 |
} |
1811 |
else if (r != null || |
1812 |
UNSAFE.compareAndSwapObject |
1813 |
(this, COMPLETIONS, p.next = completions, p)) { |
1814 |
if (s != null) |
1815 |
break; |
1816 |
q = new CompletionNode(d); |
1817 |
} |
1818 |
} |
1819 |
} |
1820 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
1821 |
T t; U u; Throwable ex; |
1822 |
if (r instanceof AltResult) { |
1823 |
ex = ((AltResult)r).ex; |
1824 |
t = null; |
1825 |
} |
1826 |
else { |
1827 |
ex = null; |
1828 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1829 |
t = tr; |
1830 |
} |
1831 |
if (ex != null) |
1832 |
u = null; |
1833 |
else if (s instanceof AltResult) { |
1834 |
ex = ((AltResult)s).ex; |
1835 |
u = null; |
1836 |
} |
1837 |
else { |
1838 |
@SuppressWarnings("unchecked") U us = (U) s; |
1839 |
u = us; |
1840 |
} |
1841 |
V v = null; |
1842 |
if (ex == null) { |
1843 |
try { |
1844 |
if (e != null) |
1845 |
e.execute(new AsyncBiApply<T,U,V>(t, u, fn, dst)); |
1846 |
else |
1847 |
v = fn.apply(t, u); |
1848 |
} catch (Throwable rex) { |
1849 |
ex = rex; |
1850 |
} |
1851 |
} |
1852 |
if (e == null || ex != null) |
1853 |
dst.internalComplete(v, ex); |
1854 |
} |
1855 |
helpPostComplete(); |
1856 |
other.helpPostComplete(); |
1857 |
return dst; |
1858 |
} |
1859 |
|
1860 |
/** |
1861 |
* Creates and returns a CompletableFuture that is completed with |
1862 |
* the results of this and the other given CompletableFuture if |
1863 |
* both complete. If this and/or the other CompletableFuture |
1864 |
* complete exceptionally, then the returned CompletableFuture |
1865 |
* also does so, with a CompletionException holding one of these |
1866 |
* exceptions as its cause. |
1867 |
* |
1868 |
* @param other the other CompletableFuture |
1869 |
* @param block the action to perform before completing the |
1870 |
* returned CompletableFuture |
1871 |
* @return the new CompletableFuture |
1872 |
*/ |
1873 |
public <U> CompletableFuture<Void> thenAcceptBoth(CompletableFuture<? extends U> other, |
1874 |
BiConsumer<? super T, ? super U> block) { |
1875 |
return doThenBiAccept(other, block, null); |
1876 |
} |
1877 |
|
1878 |
/** |
1879 |
* Creates and returns a CompletableFuture that is completed |
1880 |
* asynchronously using the {@link ForkJoinPool#commonPool()} with |
1881 |
* the results of this and the other given CompletableFuture when |
1882 |
* both complete. If this and/or the other CompletableFuture |
1883 |
* complete exceptionally, then the returned CompletableFuture |
1884 |
* also does so, with a CompletionException holding one of these |
1885 |
* exceptions as its cause. |
1886 |
* |
1887 |
* @param other the other CompletableFuture |
1888 |
* @param block the action to perform before completing the |
1889 |
* returned CompletableFuture |
1890 |
* @return the new CompletableFuture |
1891 |
*/ |
1892 |
public <U> CompletableFuture<Void> thenAcceptBothAsync(CompletableFuture<? extends U> other, |
1893 |
BiConsumer<? super T, ? super U> block) { |
1894 |
return doThenBiAccept(other, block, ForkJoinPool.commonPool()); |
1895 |
} |
1896 |
|
1897 |
/** |
1898 |
* Creates and returns a CompletableFuture that is completed |
1899 |
* asynchronously using the given executor with the results of |
1900 |
* this and the other given CompletableFuture when both complete. |
1901 |
* If this and/or the other CompletableFuture complete |
1902 |
* exceptionally, then the returned CompletableFuture also does |
1903 |
* so, with a CompletionException holding one of these exceptions as |
1904 |
* its cause. |
1905 |
* |
1906 |
* @param other the other CompletableFuture |
1907 |
* @param block the action to perform before completing the |
1908 |
* returned CompletableFuture |
1909 |
* @param executor the executor to use for asynchronous execution |
1910 |
* @return the new CompletableFuture |
1911 |
*/ |
1912 |
public <U> CompletableFuture<Void> thenAcceptBothAsync(CompletableFuture<? extends U> other, |
1913 |
BiConsumer<? super T, ? super U> block, |
1914 |
Executor executor) { |
1915 |
if (executor == null) throw new NullPointerException(); |
1916 |
return doThenBiAccept(other, block, executor); |
1917 |
} |
1918 |
|
1919 |
private <U> CompletableFuture<Void> doThenBiAccept(CompletableFuture<? extends U> other, |
1920 |
BiConsumer<? super T,? super U> fn, |
1921 |
Executor e) { |
1922 |
if (other == null || fn == null) throw new NullPointerException(); |
1923 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1924 |
BiAcceptCompletion<T,U> d = null; |
1925 |
Object r, s = null; |
1926 |
if ((r = result) == null || (s = other.result) == null) { |
1927 |
d = new BiAcceptCompletion<T,U>(this, other, fn, dst, e); |
1928 |
CompletionNode q = null, p = new CompletionNode(d); |
1929 |
while ((r == null && (r = result) == null) || |
1930 |
(s == null && (s = other.result) == null)) { |
1931 |
if (q != null) { |
1932 |
if (s != null || |
1933 |
UNSAFE.compareAndSwapObject |
1934 |
(other, COMPLETIONS, q.next = other.completions, q)) |
1935 |
break; |
1936 |
} |
1937 |
else if (r != null || |
1938 |
UNSAFE.compareAndSwapObject |
1939 |
(this, COMPLETIONS, p.next = completions, p)) { |
1940 |
if (s != null) |
1941 |
break; |
1942 |
q = new CompletionNode(d); |
1943 |
} |
1944 |
} |
1945 |
} |
1946 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
1947 |
T t; U u; Throwable ex; |
1948 |
if (r instanceof AltResult) { |
1949 |
ex = ((AltResult)r).ex; |
1950 |
t = null; |
1951 |
} |
1952 |
else { |
1953 |
ex = null; |
1954 |
@SuppressWarnings("unchecked") T tr = (T) r; |
1955 |
t = tr; |
1956 |
} |
1957 |
if (ex != null) |
1958 |
u = null; |
1959 |
else if (s instanceof AltResult) { |
1960 |
ex = ((AltResult)s).ex; |
1961 |
u = null; |
1962 |
} |
1963 |
else { |
1964 |
@SuppressWarnings("unchecked") U us = (U) s; |
1965 |
u = us; |
1966 |
} |
1967 |
if (ex == null) { |
1968 |
try { |
1969 |
if (e != null) |
1970 |
e.execute(new AsyncBiAccept<T,U>(t, u, fn, dst)); |
1971 |
else |
1972 |
fn.accept(t, u); |
1973 |
} catch (Throwable rex) { |
1974 |
ex = rex; |
1975 |
} |
1976 |
} |
1977 |
if (e == null || ex != null) |
1978 |
dst.internalComplete(null, ex); |
1979 |
} |
1980 |
helpPostComplete(); |
1981 |
other.helpPostComplete(); |
1982 |
return dst; |
1983 |
} |
1984 |
|
1985 |
/** |
1986 |
* Creates and returns a CompletableFuture that is completed |
1987 |
* when this and the other given CompletableFuture both |
1988 |
* complete. If this and/or the other CompletableFuture complete |
1989 |
* exceptionally, then the returned CompletableFuture also does |
1990 |
* so, with a CompletionException holding one of these exceptions as |
1991 |
* its cause. |
1992 |
* |
1993 |
* @param other the other CompletableFuture |
1994 |
* @param action the action to perform before completing the |
1995 |
* returned CompletableFuture |
1996 |
* @return the new CompletableFuture |
1997 |
*/ |
1998 |
public CompletableFuture<Void> runAfterBoth(CompletableFuture<?> other, |
1999 |
Runnable action) { |
2000 |
return doThenBiRun(other, action, null); |
2001 |
} |
2002 |
|
2003 |
/** |
2004 |
* Creates and returns a CompletableFuture that is completed |
2005 |
* asynchronously using the {@link ForkJoinPool#commonPool()} |
2006 |
* when this and the other given CompletableFuture both |
2007 |
* complete. If this and/or the other CompletableFuture complete |
2008 |
* exceptionally, then the returned CompletableFuture also does |
2009 |
* so, with a CompletionException holding one of these exceptions as |
2010 |
* its cause. |
2011 |
* |
2012 |
* @param other the other CompletableFuture |
2013 |
* @param action the action to perform before completing the |
2014 |
* returned CompletableFuture |
2015 |
* @return the new CompletableFuture |
2016 |
*/ |
2017 |
public CompletableFuture<Void> runAfterBothAsync(CompletableFuture<?> other, |
2018 |
Runnable action) { |
2019 |
return doThenBiRun(other, action, ForkJoinPool.commonPool()); |
2020 |
} |
2021 |
|
2022 |
/** |
2023 |
* Creates and returns a CompletableFuture that is completed |
2024 |
* asynchronously using the given executor |
2025 |
* when this and the other given CompletableFuture both |
2026 |
* complete. If this and/or the other CompletableFuture complete |
2027 |
* exceptionally, then the returned CompletableFuture also does |
2028 |
* so, with a CompletionException holding one of these exceptions as |
2029 |
* its cause. |
2030 |
* |
2031 |
* @param other the other CompletableFuture |
2032 |
* @param action the action to perform before completing the |
2033 |
* returned CompletableFuture |
2034 |
* @param executor the executor to use for asynchronous execution |
2035 |
* @return the new CompletableFuture |
2036 |
*/ |
2037 |
public CompletableFuture<Void> runAfterBothAsync(CompletableFuture<?> other, |
2038 |
Runnable action, |
2039 |
Executor executor) { |
2040 |
if (executor == null) throw new NullPointerException(); |
2041 |
return doThenBiRun(other, action, executor); |
2042 |
} |
2043 |
|
2044 |
private CompletableFuture<Void> doThenBiRun(CompletableFuture<?> other, |
2045 |
Runnable action, |
2046 |
Executor e) { |
2047 |
if (other == null || action == null) throw new NullPointerException(); |
2048 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2049 |
BiRunCompletion<T> d = null; |
2050 |
Object r, s = null; |
2051 |
if ((r = result) == null || (s = other.result) == null) { |
2052 |
d = new BiRunCompletion<T>(this, other, action, dst, e); |
2053 |
CompletionNode q = null, p = new CompletionNode(d); |
2054 |
while ((r == null && (r = result) == null) || |
2055 |
(s == null && (s = other.result) == null)) { |
2056 |
if (q != null) { |
2057 |
if (s != null || |
2058 |
UNSAFE.compareAndSwapObject |
2059 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2060 |
break; |
2061 |
} |
2062 |
else if (r != null || |
2063 |
UNSAFE.compareAndSwapObject |
2064 |
(this, COMPLETIONS, p.next = completions, p)) { |
2065 |
if (s != null) |
2066 |
break; |
2067 |
q = new CompletionNode(d); |
2068 |
} |
2069 |
} |
2070 |
} |
2071 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
2072 |
Throwable ex; |
2073 |
if (r instanceof AltResult) |
2074 |
ex = ((AltResult)r).ex; |
2075 |
else |
2076 |
ex = null; |
2077 |
if (ex == null && (s instanceof AltResult)) |
2078 |
ex = ((AltResult)s).ex; |
2079 |
if (ex == null) { |
2080 |
try { |
2081 |
if (e != null) |
2082 |
e.execute(new AsyncRun(action, dst)); |
2083 |
else |
2084 |
action.run(); |
2085 |
} catch (Throwable rex) { |
2086 |
ex = rex; |
2087 |
} |
2088 |
} |
2089 |
if (e == null || ex != null) |
2090 |
dst.internalComplete(null, ex); |
2091 |
} |
2092 |
helpPostComplete(); |
2093 |
other.helpPostComplete(); |
2094 |
return dst; |
2095 |
} |
2096 |
|
2097 |
/** |
2098 |
* Creates and returns a CompletableFuture that is completed with |
2099 |
* the result of the given function of either this or the other |
2100 |
* given CompletableFuture's results when either complete. If |
2101 |
* this and/or the other CompletableFuture complete exceptionally, |
2102 |
* then the returned CompletableFuture may also do so, with a |
2103 |
* CompletionException holding one of these exceptions as its cause. |
2104 |
* No guarantees are made about which result or exception is used |
2105 |
* in the returned CompletableFuture. |
2106 |
* |
2107 |
* @param other the other CompletableFuture |
2108 |
* @param fn the function to use to compute the value of |
2109 |
* the returned CompletableFuture |
2110 |
* @return the new CompletableFuture |
2111 |
*/ |
2112 |
public <U> CompletableFuture<U> applyToEither(CompletableFuture<? extends T> other, |
2113 |
Function<? super T, U> fn) { |
2114 |
return doOrApply(other, fn, null); |
2115 |
} |
2116 |
|
2117 |
/** |
2118 |
* Creates and returns a CompletableFuture that is completed |
2119 |
* asynchronously using the {@link ForkJoinPool#commonPool()} with |
2120 |
* the result of the given function of either this or the other |
2121 |
* given CompletableFuture's results when either complete. If |
2122 |
* this and/or the other CompletableFuture complete exceptionally, |
2123 |
* then the returned CompletableFuture may also do so, with a |
2124 |
* CompletionException holding one of these exceptions as its cause. |
2125 |
* No guarantees are made about which result or exception is used |
2126 |
* in the returned CompletableFuture. |
2127 |
* |
2128 |
* @param other the other CompletableFuture |
2129 |
* @param fn the function to use to compute the value of |
2130 |
* the returned CompletableFuture |
2131 |
* @return the new CompletableFuture |
2132 |
*/ |
2133 |
public <U> CompletableFuture<U> applyToEitherAsync(CompletableFuture<? extends T> other, |
2134 |
Function<? super T, U> fn) { |
2135 |
return doOrApply(other, fn, ForkJoinPool.commonPool()); |
2136 |
} |
2137 |
|
2138 |
/** |
2139 |
* Creates and returns a CompletableFuture that is completed |
2140 |
* asynchronously using the given executor with the result of the |
2141 |
* given function of either this or the other given |
2142 |
* CompletableFuture's results when either complete. If this |
2143 |
* and/or the other CompletableFuture complete exceptionally, then |
2144 |
* the returned CompletableFuture may also do so, with a |
2145 |
* CompletionException holding one of these exceptions as its cause. |
2146 |
* No guarantees are made about which result or exception is used |
2147 |
* in the returned CompletableFuture. |
2148 |
* |
2149 |
* @param other the other CompletableFuture |
2150 |
* @param fn the function to use to compute the value of |
2151 |
* the returned CompletableFuture |
2152 |
* @param executor the executor to use for asynchronous execution |
2153 |
* @return the new CompletableFuture |
2154 |
*/ |
2155 |
public <U> CompletableFuture<U> applyToEitherAsync(CompletableFuture<? extends T> other, |
2156 |
Function<? super T, U> fn, |
2157 |
Executor executor) { |
2158 |
if (executor == null) throw new NullPointerException(); |
2159 |
return doOrApply(other, fn, executor); |
2160 |
} |
2161 |
|
2162 |
private <U> CompletableFuture<U> doOrApply(CompletableFuture<? extends T> other, |
2163 |
Function<? super T, U> fn, |
2164 |
Executor e) { |
2165 |
if (other == null || fn == null) throw new NullPointerException(); |
2166 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
2167 |
OrApplyCompletion<T,U> d = null; |
2168 |
Object r; |
2169 |
if ((r = result) == null && (r = other.result) == null) { |
2170 |
d = new OrApplyCompletion<T,U>(this, other, fn, dst, e); |
2171 |
CompletionNode q = null, p = new CompletionNode(d); |
2172 |
while ((r = result) == null && (r = other.result) == null) { |
2173 |
if (q != null) { |
2174 |
if (UNSAFE.compareAndSwapObject |
2175 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2176 |
break; |
2177 |
} |
2178 |
else if (UNSAFE.compareAndSwapObject |
2179 |
(this, COMPLETIONS, p.next = completions, p)) |
2180 |
q = new CompletionNode(d); |
2181 |
} |
2182 |
} |
2183 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2184 |
T t; Throwable ex; |
2185 |
if (r instanceof AltResult) { |
2186 |
ex = ((AltResult)r).ex; |
2187 |
t = null; |
2188 |
} |
2189 |
else { |
2190 |
ex = null; |
2191 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2192 |
t = tr; |
2193 |
} |
2194 |
U u = null; |
2195 |
if (ex == null) { |
2196 |
try { |
2197 |
if (e != null) |
2198 |
e.execute(new AsyncApply<T,U>(t, fn, dst)); |
2199 |
else |
2200 |
u = fn.apply(t); |
2201 |
} catch (Throwable rex) { |
2202 |
ex = rex; |
2203 |
} |
2204 |
} |
2205 |
if (e == null || ex != null) |
2206 |
dst.internalComplete(u, ex); |
2207 |
} |
2208 |
helpPostComplete(); |
2209 |
other.helpPostComplete(); |
2210 |
return dst; |
2211 |
} |
2212 |
|
2213 |
/** |
2214 |
* Creates and returns a CompletableFuture that is completed after |
2215 |
* performing the given action with the result of either this or the |
2216 |
* other given CompletableFuture's result, when either complete. |
2217 |
* If this and/or the other CompletableFuture complete |
2218 |
* exceptionally, then the returned CompletableFuture may also do |
2219 |
* so, with a CompletionException holding one of these exceptions as |
2220 |
* its cause. No guarantees are made about which exception is |
2221 |
* used in the returned CompletableFuture. |
2222 |
* |
2223 |
* @param other the other CompletableFuture |
2224 |
* @param block the action to perform before completing the |
2225 |
* returned CompletableFuture |
2226 |
* @return the new CompletableFuture |
2227 |
*/ |
2228 |
public CompletableFuture<Void> acceptEither(CompletableFuture<? extends T> other, |
2229 |
Consumer<? super T> block) { |
2230 |
return doOrAccept(other, block, null); |
2231 |
} |
2232 |
|
2233 |
/** |
2234 |
* Creates and returns a CompletableFuture that is completed |
2235 |
* asynchronously using the {@link ForkJoinPool#commonPool()}, |
2236 |
* performing the given action with the result of either this or |
2237 |
* the other given CompletableFuture's result, when either |
2238 |
* complete. If this and/or the other CompletableFuture complete |
2239 |
* exceptionally, then the returned CompletableFuture may also do |
2240 |
* so, with a CompletionException holding one of these exceptions as |
2241 |
* its cause. No guarantees are made about which exception is |
2242 |
* used in the returned CompletableFuture. |
2243 |
* |
2244 |
* @param other the other CompletableFuture |
2245 |
* @param block the action to perform before completing the |
2246 |
* returned CompletableFuture |
2247 |
* @return the new CompletableFuture |
2248 |
*/ |
2249 |
public CompletableFuture<Void> acceptEitherAsync(CompletableFuture<? extends T> other, |
2250 |
Consumer<? super T> block) { |
2251 |
return doOrAccept(other, block, ForkJoinPool.commonPool()); |
2252 |
} |
2253 |
|
2254 |
/** |
2255 |
* Creates and returns a CompletableFuture that is completed |
2256 |
* asynchronously using the given executor, |
2257 |
* performing the given action with the result of either this or |
2258 |
* the other given CompletableFuture's result, when either |
2259 |
* complete. If this and/or the other CompletableFuture complete |
2260 |
* exceptionally, then the returned CompletableFuture may also do |
2261 |
* so, with a CompletionException holding one of these exceptions as |
2262 |
* its cause. No guarantees are made about which exception is |
2263 |
* used in the returned CompletableFuture. |
2264 |
* |
2265 |
* @param other the other CompletableFuture |
2266 |
* @param block the action to perform before completing the |
2267 |
* returned CompletableFuture |
2268 |
* @param executor the executor to use for asynchronous execution |
2269 |
* @return the new CompletableFuture |
2270 |
*/ |
2271 |
public CompletableFuture<Void> acceptEitherAsync(CompletableFuture<? extends T> other, |
2272 |
Consumer<? super T> block, |
2273 |
Executor executor) { |
2274 |
if (executor == null) throw new NullPointerException(); |
2275 |
return doOrAccept(other, block, executor); |
2276 |
} |
2277 |
|
2278 |
private CompletableFuture<Void> doOrAccept(CompletableFuture<? extends T> other, |
2279 |
Consumer<? super T> fn, |
2280 |
Executor e) { |
2281 |
if (other == null || fn == null) throw new NullPointerException(); |
2282 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2283 |
OrAcceptCompletion<T> d = null; |
2284 |
Object r; |
2285 |
if ((r = result) == null && (r = other.result) == null) { |
2286 |
d = new OrAcceptCompletion<T>(this, other, fn, dst, e); |
2287 |
CompletionNode q = null, p = new CompletionNode(d); |
2288 |
while ((r = result) == null && (r = other.result) == null) { |
2289 |
if (q != null) { |
2290 |
if (UNSAFE.compareAndSwapObject |
2291 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2292 |
break; |
2293 |
} |
2294 |
else if (UNSAFE.compareAndSwapObject |
2295 |
(this, COMPLETIONS, p.next = completions, p)) |
2296 |
q = new CompletionNode(d); |
2297 |
} |
2298 |
} |
2299 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2300 |
T t; Throwable ex; |
2301 |
if (r instanceof AltResult) { |
2302 |
ex = ((AltResult)r).ex; |
2303 |
t = null; |
2304 |
} |
2305 |
else { |
2306 |
ex = null; |
2307 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2308 |
t = tr; |
2309 |
} |
2310 |
if (ex == null) { |
2311 |
try { |
2312 |
if (e != null) |
2313 |
e.execute(new AsyncAccept<T>(t, fn, dst)); |
2314 |
else |
2315 |
fn.accept(t); |
2316 |
} catch (Throwable rex) { |
2317 |
ex = rex; |
2318 |
} |
2319 |
} |
2320 |
if (e == null || ex != null) |
2321 |
dst.internalComplete(null, ex); |
2322 |
} |
2323 |
helpPostComplete(); |
2324 |
other.helpPostComplete(); |
2325 |
return dst; |
2326 |
} |
2327 |
|
2328 |
/** |
2329 |
* Creates and returns a CompletableFuture that is completed |
2330 |
* after this or the other given CompletableFuture complete. If |
2331 |
* this and/or the other CompletableFuture complete exceptionally, |
2332 |
* then the returned CompletableFuture may also do so, with a |
2333 |
* CompletionException holding one of these exceptions as its cause. |
2334 |
* No guarantees are made about which exception is used in the |
2335 |
* returned CompletableFuture. |
2336 |
* |
2337 |
* @param other the other CompletableFuture |
2338 |
* @param action the action to perform before completing the |
2339 |
* returned CompletableFuture |
2340 |
* @return the new CompletableFuture |
2341 |
*/ |
2342 |
public CompletableFuture<Void> runAfterEither(CompletableFuture<?> other, |
2343 |
Runnable action) { |
2344 |
return doOrRun(other, action, null); |
2345 |
} |
2346 |
|
2347 |
/** |
2348 |
* Creates and returns a CompletableFuture that is completed |
2349 |
* asynchronously using the {@link ForkJoinPool#commonPool()} |
2350 |
* after this or the other given CompletableFuture complete. If |
2351 |
* this and/or the other CompletableFuture complete exceptionally, |
2352 |
* then the returned CompletableFuture may also do so, with a |
2353 |
* CompletionException holding one of these exceptions as its cause. |
2354 |
* No guarantees are made about which exception is used in the |
2355 |
* returned CompletableFuture. |
2356 |
* |
2357 |
* @param other the other CompletableFuture |
2358 |
* @param action the action to perform before completing the |
2359 |
* returned CompletableFuture |
2360 |
* @return the new CompletableFuture |
2361 |
*/ |
2362 |
public CompletableFuture<Void> runAfterEitherAsync(CompletableFuture<?> other, |
2363 |
Runnable action) { |
2364 |
return doOrRun(other, action, ForkJoinPool.commonPool()); |
2365 |
} |
2366 |
|
2367 |
/** |
2368 |
* Creates and returns a CompletableFuture that is completed |
2369 |
* asynchronously using the given executor after this or the other |
2370 |
* given CompletableFuture complete. If this and/or the other |
2371 |
* CompletableFuture complete exceptionally, then the returned |
2372 |
* CompletableFuture may also do so, with a CompletionException |
2373 |
* holding one of these exceptions as its cause. No guarantees are |
2374 |
* made about which exception is used in the returned |
2375 |
* CompletableFuture. |
2376 |
* |
2377 |
* @param other the other CompletableFuture |
2378 |
* @param action the action to perform before completing the |
2379 |
* returned CompletableFuture |
2380 |
* @param executor the executor to use for asynchronous execution |
2381 |
* @return the new CompletableFuture |
2382 |
*/ |
2383 |
public CompletableFuture<Void> runAfterEitherAsync(CompletableFuture<?> other, |
2384 |
Runnable action, |
2385 |
Executor executor) { |
2386 |
if (executor == null) throw new NullPointerException(); |
2387 |
return doOrRun(other, action, executor); |
2388 |
} |
2389 |
|
2390 |
private CompletableFuture<Void> doOrRun(CompletableFuture<?> other, |
2391 |
Runnable action, |
2392 |
Executor e) { |
2393 |
if (other == null || action == null) throw new NullPointerException(); |
2394 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
2395 |
OrRunCompletion<T> d = null; |
2396 |
Object r; |
2397 |
if ((r = result) == null && (r = other.result) == null) { |
2398 |
d = new OrRunCompletion<T>(this, other, action, dst, e); |
2399 |
CompletionNode q = null, p = new CompletionNode(d); |
2400 |
while ((r = result) == null && (r = other.result) == null) { |
2401 |
if (q != null) { |
2402 |
if (UNSAFE.compareAndSwapObject |
2403 |
(other, COMPLETIONS, q.next = other.completions, q)) |
2404 |
break; |
2405 |
} |
2406 |
else if (UNSAFE.compareAndSwapObject |
2407 |
(this, COMPLETIONS, p.next = completions, p)) |
2408 |
q = new CompletionNode(d); |
2409 |
} |
2410 |
} |
2411 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2412 |
Throwable ex; |
2413 |
if (r instanceof AltResult) |
2414 |
ex = ((AltResult)r).ex; |
2415 |
else |
2416 |
ex = null; |
2417 |
if (ex == null) { |
2418 |
try { |
2419 |
if (e != null) |
2420 |
e.execute(new AsyncRun(action, dst)); |
2421 |
else |
2422 |
action.run(); |
2423 |
} catch (Throwable rex) { |
2424 |
ex = rex; |
2425 |
} |
2426 |
} |
2427 |
if (e == null || ex != null) |
2428 |
dst.internalComplete(null, ex); |
2429 |
} |
2430 |
helpPostComplete(); |
2431 |
other.helpPostComplete(); |
2432 |
return dst; |
2433 |
} |
2434 |
|
2435 |
/** |
2436 |
* Returns a CompletableFuture (or an equivalent one) produced by |
2437 |
* the given function of the result of this CompletableFuture when |
2438 |
* completed. If this CompletableFuture completes exceptionally, |
2439 |
* then the returned CompletableFuture also does so, with a |
2440 |
* CompletionException holding this exception as its cause. |
2441 |
* |
2442 |
* @param fn the function returning a new CompletableFuture. |
2443 |
* @return the CompletableFuture, that {@code isDone()} upon |
2444 |
* return if completed by the given function, or an exception |
2445 |
* occurs. |
2446 |
*/ |
2447 |
public <U> CompletableFuture<U> thenCompose(Function<? super T, |
2448 |
CompletableFuture<U>> fn) { |
2449 |
if (fn == null) throw new NullPointerException(); |
2450 |
CompletableFuture<U> dst = null; |
2451 |
ComposeCompletion<T,U> d = null; |
2452 |
Object r; |
2453 |
if ((r = result) == null) { |
2454 |
dst = new CompletableFuture<U>(); |
2455 |
CompletionNode p = new CompletionNode |
2456 |
(d = new ComposeCompletion<T,U>(this, fn, dst)); |
2457 |
while ((r = result) == null) { |
2458 |
if (UNSAFE.compareAndSwapObject |
2459 |
(this, COMPLETIONS, p.next = completions, p)) |
2460 |
break; |
2461 |
} |
2462 |
} |
2463 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2464 |
T t; Throwable ex; |
2465 |
if (r instanceof AltResult) { |
2466 |
ex = ((AltResult)r).ex; |
2467 |
t = null; |
2468 |
} |
2469 |
else { |
2470 |
ex = null; |
2471 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2472 |
t = tr; |
2473 |
} |
2474 |
if (ex == null) { |
2475 |
try { |
2476 |
dst = fn.apply(t); |
2477 |
} catch (Throwable rex) { |
2478 |
ex = rex; |
2479 |
} |
2480 |
} |
2481 |
if (dst == null) { |
2482 |
dst = new CompletableFuture<U>(); |
2483 |
if (ex == null) |
2484 |
ex = new NullPointerException(); |
2485 |
} |
2486 |
if (ex != null) |
2487 |
dst.internalComplete(null, ex); |
2488 |
} |
2489 |
helpPostComplete(); |
2490 |
dst.helpPostComplete(); |
2491 |
return dst; |
2492 |
} |
2493 |
|
2494 |
/** |
2495 |
* Creates and returns a CompletableFuture that is completed with |
2496 |
* the result of the given function of the exception triggering |
2497 |
* this CompletableFuture's completion when it completes |
2498 |
* exceptionally; Otherwise, if this CompletableFuture completes |
2499 |
* normally, then the returned CompletableFuture also completes |
2500 |
* normally with the same value. |
2501 |
* |
2502 |
* @param fn the function to use to compute the value of the |
2503 |
* returned CompletableFuture if this CompletableFuture completed |
2504 |
* exceptionally |
2505 |
* @return the new CompletableFuture |
2506 |
*/ |
2507 |
public CompletableFuture<T> exceptionally(Function<Throwable, ? extends T> fn) { |
2508 |
if (fn == null) throw new NullPointerException(); |
2509 |
CompletableFuture<T> dst = new CompletableFuture<T>(); |
2510 |
ExceptionCompletion<T> d = null; |
2511 |
Object r; |
2512 |
if ((r = result) == null) { |
2513 |
CompletionNode p = |
2514 |
new CompletionNode(d = new ExceptionCompletion<T>(this, fn, dst)); |
2515 |
while ((r = result) == null) { |
2516 |
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, |
2517 |
p.next = completions, p)) |
2518 |
break; |
2519 |
} |
2520 |
} |
2521 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2522 |
T t = null; Throwable ex, dx = null; |
2523 |
if (r instanceof AltResult) { |
2524 |
if ((ex = ((AltResult)r).ex) != null) { |
2525 |
try { |
2526 |
t = fn.apply(ex); |
2527 |
} catch (Throwable rex) { |
2528 |
dx = rex; |
2529 |
} |
2530 |
} |
2531 |
} |
2532 |
else { |
2533 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2534 |
t = tr; |
2535 |
} |
2536 |
dst.internalComplete(t, dx); |
2537 |
} |
2538 |
helpPostComplete(); |
2539 |
return dst; |
2540 |
} |
2541 |
|
2542 |
/** |
2543 |
* Creates and returns a CompletableFuture that is completed with |
2544 |
* the result of the given function of the result and exception of |
2545 |
* this CompletableFuture's completion when it completes. The |
2546 |
* given function is invoked with the result (or {@code null} if |
2547 |
* none) and the exception (or {@code null} if none) of this |
2548 |
* CompletableFuture when complete. |
2549 |
* |
2550 |
* @param fn the function to use to compute the value of the |
2551 |
* returned CompletableFuture |
2552 |
|
2553 |
* @return the new CompletableFuture |
2554 |
*/ |
2555 |
public <U> CompletableFuture<U> handle(BiFunction<? super T, Throwable, ? extends U> fn) { |
2556 |
if (fn == null) throw new NullPointerException(); |
2557 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
2558 |
HandleCompletion<T,U> d = null; |
2559 |
Object r; |
2560 |
if ((r = result) == null) { |
2561 |
CompletionNode p = |
2562 |
new CompletionNode(d = new HandleCompletion<T,U>(this, fn, dst)); |
2563 |
while ((r = result) == null) { |
2564 |
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, |
2565 |
p.next = completions, p)) |
2566 |
break; |
2567 |
} |
2568 |
} |
2569 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
2570 |
T t; Throwable ex; |
2571 |
if (r instanceof AltResult) { |
2572 |
ex = ((AltResult)r).ex; |
2573 |
t = null; |
2574 |
} |
2575 |
else { |
2576 |
ex = null; |
2577 |
@SuppressWarnings("unchecked") T tr = (T) r; |
2578 |
t = tr; |
2579 |
} |
2580 |
U u; Throwable dx; |
2581 |
try { |
2582 |
u = fn.apply(t, ex); |
2583 |
dx = null; |
2584 |
} catch (Throwable rex) { |
2585 |
dx = rex; |
2586 |
u = null; |
2587 |
} |
2588 |
dst.internalComplete(u, dx); |
2589 |
} |
2590 |
helpPostComplete(); |
2591 |
return dst; |
2592 |
} |
2593 |
|
2594 |
/** |
2595 |
* Attempts to complete this CompletableFuture with |
2596 |
* a {@link CancellationException}. |
2597 |
* |
2598 |
* @param mayInterruptIfRunning this value has no effect in this |
2599 |
* implementation because interrupts are not used to control |
2600 |
* processing. |
2601 |
* |
2602 |
* @return {@code true} if this task is now cancelled |
2603 |
*/ |
2604 |
public boolean cancel(boolean mayInterruptIfRunning) { |
2605 |
Object r; |
2606 |
while ((r = result) == null) { |
2607 |
r = new AltResult(new CancellationException()); |
2608 |
if (UNSAFE.compareAndSwapObject(this, RESULT, null, r)) { |
2609 |
postComplete(); |
2610 |
return true; |
2611 |
} |
2612 |
} |
2613 |
return ((r instanceof AltResult) && |
2614 |
(((AltResult)r).ex instanceof CancellationException)); |
2615 |
} |
2616 |
|
2617 |
/** |
2618 |
* Returns {@code true} if this CompletableFuture was cancelled |
2619 |
* before it completed normally. |
2620 |
* |
2621 |
* @return {@code true} if this CompletableFuture was cancelled |
2622 |
* before it completed normally |
2623 |
*/ |
2624 |
public boolean isCancelled() { |
2625 |
Object r; |
2626 |
return ((r = result) != null && |
2627 |
(r instanceof AltResult) && |
2628 |
(((AltResult)r).ex instanceof CancellationException)); |
2629 |
} |
2630 |
|
2631 |
/** |
2632 |
* Forcibly sets or resets the value subsequently returned by |
2633 |
* method get() and related methods, whether or not already |
2634 |
* completed. This method is designed for use only in error |
2635 |
* recovery actions, and even in such situations may result in |
2636 |
* ongoing dependent completions using established versus |
2637 |
* overwritten outcomes. |
2638 |
* |
2639 |
* @param value the completion value |
2640 |
*/ |
2641 |
public void obtrudeValue(T value) { |
2642 |
result = (value == null) ? NIL : value; |
2643 |
postComplete(); |
2644 |
} |
2645 |
|
2646 |
/** |
2647 |
* Forcibly causes subsequent invocations of method get() and |
2648 |
* related methods to throw the given exception, whether or not |
2649 |
* already completed. This method is designed for use only in |
2650 |
* recovery actions, and even in such situations may result in |
2651 |
* ongoing dependent completions using established versus |
2652 |
* overwritten outcomes. |
2653 |
* |
2654 |
* @param ex the exception |
2655 |
*/ |
2656 |
public void obtrudeException(Throwable ex) { |
2657 |
if (ex == null) throw new NullPointerException(); |
2658 |
result = new AltResult(ex); |
2659 |
postComplete(); |
2660 |
} |
2661 |
|
2662 |
// Unsafe mechanics |
2663 |
private static final sun.misc.Unsafe UNSAFE; |
2664 |
private static final long RESULT; |
2665 |
private static final long WAITERS; |
2666 |
private static final long COMPLETIONS; |
2667 |
static { |
2668 |
try { |
2669 |
UNSAFE = sun.misc.Unsafe.getUnsafe(); |
2670 |
Class<?> k = CompletableFuture.class; |
2671 |
RESULT = UNSAFE.objectFieldOffset |
2672 |
(k.getDeclaredField("result")); |
2673 |
WAITERS = UNSAFE.objectFieldOffset |
2674 |
(k.getDeclaredField("waiters")); |
2675 |
COMPLETIONS = UNSAFE.objectFieldOffset |
2676 |
(k.getDeclaredField("completions")); |
2677 |
} catch (Exception e) { |
2678 |
throw new Error(e); |
2679 |
} |
2680 |
} |
2681 |
} |