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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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package java.util.concurrent; |
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import java.util.function.Block; |
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import java.util.function.Supplier; |
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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.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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* 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. |
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* |
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jsr166 |
1.4 |
* <p>Similar methods are available for function-based usages in |
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* which dependent stages typically propagate values, as well as |
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* result-less action-based usages, that are normally associated with |
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* {@code CompletableFuture<Void>} Futures. Functions and actions |
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* supplied for dependent completions using {@code then}, {@code |
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* andThen}, {@code orThen}, and {@code exceptionally} may be |
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* 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 method {@code then} and related 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 will |
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* succeed. When completion entails computation of a function or |
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* action, it is executed <em>after</em> establishing precedence. If |
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* this function terminates abruptly with an exception, then method |
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* {@code complete} acts as {@code completeExceptionally} with that |
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* exception. |
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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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* to 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. |
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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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* Quick overview (more to come): |
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* |
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* 1. Non-nullness of field result indicates done. An AltResult is |
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* used to box null as a result, as well as to hold exceptions. |
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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 |
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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. |
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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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static final AltResult NIL = new AltResult(null); |
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/** |
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* Simple linked list nodes to record waiting threads in a Treiber |
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* stack. See other classes such as Phaser and SynchronousQueue |
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* for more detailed explanation. |
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*/ |
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static final class WaitNode { |
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volatile Thread thread; |
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volatile WaitNode next; |
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} |
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/** |
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* Simple linked list nodes to record completions, used in |
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* basically the same way as WaitNodes |
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*/ |
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static final class CompletionNode { |
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final Completion completion; |
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volatile CompletionNode next; |
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CompletionNode(Completion completion) { this.completion = completion; } |
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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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* Creates a new incomplete CompletableFuture. |
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*/ |
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public CompletableFuture() { |
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} |
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/** |
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* Asynchronously executes in the {@link |
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* ForkJoinPool#commonPool()}, a task that completes the returned |
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* CompletableFuture with the result of the given Supplier. |
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* |
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* @param supplier a function returning the value to be used |
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* to complete the returned CompletableFuture. |
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* @return the CompletableFuture. |
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*/ |
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public static <U> CompletableFuture<U> async(Supplier<U> supplier) { |
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if (supplier == null) throw new NullPointerException(); |
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CompletableFuture<U> f = new CompletableFuture<U>(); |
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ForkJoinPool.commonPool(). |
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execute((ForkJoinTask<?>)new AsyncSupplier(supplier, f)); |
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return f; |
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} |
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/** |
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* Asynchronously executes using the given executor, a task that |
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* completes the returned CompletableFuture with the result of the |
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* given Supplier. |
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* |
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* @param supplier a function returning the value to be used |
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* to complete the returned CompletableFuture. |
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* @param executor the executor to use for asynchronous execution |
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* @return the CompletableFuture. |
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*/ |
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public static <U> CompletableFuture<U> async(Supplier<U> supplier, |
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Executor executor) { |
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if (executor == null || supplier == null) |
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throw new NullPointerException(); |
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CompletableFuture<U> f = new CompletableFuture<U>(); |
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executor.execute(new AsyncSupplier(supplier, f)); |
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return f; |
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} |
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/** |
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* Asynchronously executes in the {@link |
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* ForkJoinPool#commonPool()} a task that runs the given action, |
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* and then completes the returned CompletableFuture |
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* |
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* @param runnable the action to run before completing the |
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* returned CompletableFuture. |
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* @return the CompletableFuture. |
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*/ |
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public static CompletableFuture<Void> async(Runnable runnable) { |
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if (runnable == null) throw new NullPointerException(); |
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CompletableFuture<Void> f = new CompletableFuture<Void>(); |
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ForkJoinPool.commonPool(). |
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execute((ForkJoinTask<?>)new AsyncRunnable(runnable, f)); |
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return f; |
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} |
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/** |
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* Asynchronously executes using the given executor, a task that |
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* runs the given action, and then completes the returned |
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* CompletableFuture |
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* |
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* @param runnable the action to run before completing the |
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* returned CompletableFuture. |
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* @param executor the executor to use for asynchronous execution |
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* @return the CompletableFuture. |
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*/ |
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public static CompletableFuture<Void> async(Runnable runnable, |
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Executor executor) { |
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if (executor == null || runnable == null) |
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throw new NullPointerException(); |
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CompletableFuture<Void> f = new CompletableFuture<Void>(); |
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executor.execute(new AsyncRunnable(runnable, f)); |
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return f; |
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} |
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/** |
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* Returns {@code true} if completed in any fashion: normally, |
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* exceptionally, or cancellation. |
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* |
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* @return {@code true} if completed |
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*/ |
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public boolean isDone() { |
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return result != null; |
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} |
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/** |
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* Returns the result value when complete, or throws an |
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* (unchecked) exception if completed exceptionally. To better |
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* conform with the use of common functional forms, this method |
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* transforms any checked exception possible with {@link |
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* Future#get} into an (unchecked) {@link RuntimeException} with |
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* the underlying exception as its cause. (The checked exception |
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* convention is available using the timed form of get.) |
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* |
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* @return the result value |
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*/ |
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public T get() { |
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Object r; Throwable ex; |
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jsr166 |
1.2 |
if ((r = result) == null) |
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return waitingGet(); |
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if (r instanceof AltResult) { |
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if ((ex = ((AltResult)r).ex) != null) |
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rethrow(ex); |
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return null; |
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} |
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return (T)r; |
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1.1 |
} |
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/** |
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* Returns the result value (or throws any encountered exception) |
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* if completed, else returns the given valueIfAbsent. |
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* |
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* @param valueIfAbsent the value to return if not completed |
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* @return the result value, if completed, else the given valueIfAbsent |
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*/ |
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public T getNow(T valueIfAbsent) { |
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Object r; Throwable ex; |
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jsr166 |
1.2 |
if ((r = result) == null) |
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return valueIfAbsent; |
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if (r instanceof AltResult) { |
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if ((ex = ((AltResult)r).ex) != null) |
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rethrow(ex); |
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return null; |
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} |
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return (T)r; |
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1.1 |
} |
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/** |
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* Waits if necessary for at most the given time for completion, |
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* and then retrieves its result, if available. |
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* |
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* @param timeout the maximum time to wait |
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* @param unit the time unit of the timeout argument |
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* @return the computed result |
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* @throws CancellationException if the computation was cancelled |
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* @throws ExecutionException if the computation threw an |
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* exception |
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* @throws InterruptedException if the current thread was interrupted |
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* while waiting |
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* @throws TimeoutException if the wait timed out |
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*/ |
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public T get(long timeout, TimeUnit unit) |
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throws InterruptedException, ExecutionException, TimeoutException { |
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Object r; Throwable ex; |
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long nanos = unit.toNanos(timeout); |
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if (Thread.interrupted()) |
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throw new InterruptedException(); |
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jsr166 |
1.2 |
if ((r = result) == null) |
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r = timedAwaitDone(nanos); |
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if (r instanceof AltResult) { |
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if ((ex = ((AltResult)r).ex) != null) |
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dl |
1.1 |
throw new ExecutionException(ex); |
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jsr166 |
1.2 |
return null; |
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} |
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return (T)r; |
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dl |
1.1 |
} |
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/** |
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* If not already completed, sets the value returned by {@link |
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* #get()} and related methods to the given value. |
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* |
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* @param value the result value |
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* @return true if this invocation caused this CompletableFuture |
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* to transition to a completed state, else false. |
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*/ |
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public boolean complete(T value) { |
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if (result == null && |
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UNSAFE.compareAndSwapObject(this, RESULT, null, |
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1.2 |
(value == null) ? NIL : value)) { |
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1.1 |
postComplete(); |
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return true; |
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} |
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return false; |
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} |
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/** |
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* If not already completed, causes invocations of {@link #get()} |
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* and related methods to throw the given exception. |
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* |
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* @param ex the exception |
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* @return true if this invocation caused this CompletableFuture |
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* to transition to a completed state, else false. |
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*/ |
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public boolean completeExceptionally(Throwable ex) { |
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if (ex == null) throw new NullPointerException(); |
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if (result == null) { |
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Object r = new AltResult(ex); |
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if (UNSAFE.compareAndSwapObject(this, RESULT, null, r)) { |
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postComplete(); |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Creates and returns a CompletableFuture that is completed with |
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* the result of the given function of this CompletableFuture. |
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* If this CompletableFuture completes exceptionally, |
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* then the returned CompletableFuture also does so, |
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* with a RuntimeException having this exception as |
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* its cause. |
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* |
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* @param fn the function to use to compute the value of |
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* the returned CompletableFuture |
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* @return the new CompletableFuture |
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*/ |
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public <U> CompletableFuture<U> then(Function<? super T,? extends U> fn) { |
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return thenFunction(fn, null); |
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} |
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/** |
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* Creates and returns a CompletableFuture that is asynchronously |
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* completed using the {@link ForkJoinPool#commonPool()} with the |
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* result of the given function of this CompletableFuture. If |
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* this CompletableFuture completes exceptionally, then the |
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* returned CompletableFuture also does so, with a |
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* RuntimeException having this exception as its cause. |
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* |
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* @param fn the function to use to compute the value of |
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* the returned CompletableFuture |
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* @return the new CompletableFuture |
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*/ |
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public <U> CompletableFuture<U> thenAsync(Function<? super T,? extends U> fn) { |
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return thenFunction(fn, ForkJoinPool.commonPool()); |
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} |
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/** |
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* Creates and returns a CompletableFuture that is asynchronously |
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* completed using the given executor with the result of the given |
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* function of this CompletableFuture. If this CompletableFuture |
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* completes exceptionally, then the returned CompletableFuture |
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* also does so, with a RuntimeException having this exception as |
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* its cause. |
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* |
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* @param fn the function to use to compute the value of |
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* the returned CompletableFuture |
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* @param executor the executor to use for asynchronous execution |
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* @return the new CompletableFuture |
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*/ |
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public <U> CompletableFuture<U> thenAsync(Function<? super T,? extends U> fn, |
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Executor executor) { |
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if (executor == null) throw new NullPointerException(); |
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return thenFunction(fn, executor); |
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} |
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/** |
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* Creates and returns a CompletableFuture that is completed after |
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* performing the given action if/when this CompletableFuture |
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* completes. If this CompletableFuture completes exceptionally, |
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* then the returned CompletableFuture also does so, with a |
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* RuntimeException having this exception as its cause. |
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* |
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* @param action the action to perform before completing the |
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* returned CompletableFuture |
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* @return the new CompletableFuture |
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*/ |
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public CompletableFuture<Void> then(Runnable action) { |
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return thenRunnable(action, null); |
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} |
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/** |
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* Creates and returns a CompletableFuture that is asynchronously |
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* completed using the {@link ForkJoinPool#commonPool()} after |
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* performing the given action if/when this CompletableFuture |
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* completes. If this CompletableFuture completes exceptionally, |
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* then the returned CompletableFuture also does so, with a |
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* RuntimeException having this exception as its cause. |
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* |
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* @param action the action to perform before completing the |
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* returned CompletableFuture |
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* @return the new CompletableFuture |
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*/ |
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public CompletableFuture<Void> thenAsync(Runnable action) { |
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return thenRunnable(action, ForkJoinPool.commonPool()); |
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} |
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/** |
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* Creates and returns a CompletableFuture that is asynchronously |
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* completed using the given executor after performing the given |
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|
|
* action if/when this CompletableFuture completes. If this |
388 |
|
|
* CompletableFuture completes exceptionally, then the returned |
389 |
|
|
* CompletableFuture also does so, with a RuntimeException having |
390 |
|
|
* this exception as its cause. |
391 |
|
|
* |
392 |
|
|
* @param action the action to perform before completing the |
393 |
|
|
* returned CompletableFuture |
394 |
|
|
* @param executor the executor to use for asynchronous execution |
395 |
|
|
* @return the new CompletableFuture |
396 |
|
|
*/ |
397 |
|
|
public CompletableFuture<Void> thenAsync(Runnable action, Executor executor) { |
398 |
|
|
if (executor == null) throw new NullPointerException(); |
399 |
|
|
return thenRunnable(action, executor); |
400 |
|
|
} |
401 |
|
|
|
402 |
|
|
/** |
403 |
|
|
* Creates and returns a CompletableFuture that is completed with |
404 |
|
|
* the result of the given function of this and the other given |
405 |
|
|
* CompletableFuture's results if/when both complete. If this or |
406 |
|
|
* the other CompletableFuture complete exceptionally, then the |
407 |
|
|
* returned CompletableFuture also does so, with a |
408 |
|
|
* RuntimeException having the exception as its cause. |
409 |
|
|
* |
410 |
|
|
* @param other the other CompletableFuture |
411 |
|
|
* @param fn the function to use to compute the value of |
412 |
|
|
* the returned CompletableFuture |
413 |
|
|
* @return the new CompletableFuture |
414 |
|
|
*/ |
415 |
|
|
public <U,V> CompletableFuture<V> andThen(CompletableFuture<? extends U> other, |
416 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
417 |
|
|
return andFunction(other, fn, null); |
418 |
|
|
} |
419 |
|
|
|
420 |
|
|
/** |
421 |
jsr166 |
1.3 |
* Creates and returns a CompletableFuture that is asynchronously |
422 |
dl |
1.1 |
* completed using the {@link ForkJoinPool#commonPool()} with |
423 |
|
|
* the result of the given function of this and the other given |
424 |
|
|
* CompletableFuture's results if/when both complete. If this or |
425 |
|
|
* the other CompletableFuture complete exceptionally, then the |
426 |
|
|
* returned CompletableFuture also does so, with a |
427 |
|
|
* RuntimeException having the exception as its cause. |
428 |
|
|
* |
429 |
|
|
* @param other the other CompletableFuture |
430 |
|
|
* @param fn the function to use to compute the value of |
431 |
|
|
* the returned CompletableFuture |
432 |
|
|
* @return the new CompletableFuture |
433 |
|
|
*/ |
434 |
|
|
public <U,V> CompletableFuture<V> andThenAsync(CompletableFuture<? extends U> other, |
435 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
436 |
|
|
return andFunction(other, fn, ForkJoinPool.commonPool()); |
437 |
|
|
} |
438 |
|
|
|
439 |
|
|
/** |
440 |
jsr166 |
1.3 |
* Creates and returns a CompletableFuture that is |
441 |
dl |
1.1 |
* asynchronously completed using the given executor with the |
442 |
|
|
* result of the given function of this and the other given |
443 |
|
|
* CompletableFuture's results if/when both complete. If this or |
444 |
|
|
* the other CompletableFuture complete exceptionally, then the |
445 |
|
|
* returned CompletableFuture also does so, with a |
446 |
|
|
* RuntimeException having the exception as its cause. |
447 |
|
|
* |
448 |
|
|
* @param other the other CompletableFuture |
449 |
|
|
* @param fn the function to use to compute the value of |
450 |
|
|
* the returned CompletableFuture |
451 |
|
|
* @param executor the executor to use for asynchronous execution |
452 |
|
|
* @return the new CompletableFuture |
453 |
|
|
*/ |
454 |
|
|
|
455 |
|
|
public <U,V> CompletableFuture<V> andThenAsync(CompletableFuture<? extends U> other, |
456 |
|
|
BiFunction<? super T,? super U,? extends V> fn, |
457 |
|
|
Executor executor) { |
458 |
|
|
if (executor == null) throw new NullPointerException(); |
459 |
|
|
return andFunction(other, fn, executor); |
460 |
|
|
} |
461 |
|
|
|
462 |
|
|
/** |
463 |
|
|
* Creates and returns a CompletableFuture that is completed |
464 |
|
|
* if/when this and the other given CompletableFuture both |
465 |
|
|
* complete. If this and/or the other CompletableFuture complete |
466 |
|
|
* exceptionally, then the returned CompletableFuture also does |
467 |
|
|
* so, with a RuntimeException having the one of the exceptions as |
468 |
|
|
* its cause. |
469 |
|
|
* |
470 |
|
|
* @param other the other CompletableFuture |
471 |
|
|
* @param action the action to perform before completing the |
472 |
|
|
* returned CompletableFuture |
473 |
|
|
* @return the new CompletableFuture |
474 |
|
|
*/ |
475 |
|
|
public CompletableFuture<Void> andThen(CompletableFuture<?> other, |
476 |
|
|
Runnable action) { |
477 |
|
|
return andRunnable(other, action, null); |
478 |
|
|
} |
479 |
|
|
|
480 |
|
|
/** |
481 |
|
|
* Creates and returns a CompletableFuture that is completed |
482 |
|
|
* asynchronously using the {@link ForkJoinPool#commonPool()} |
483 |
|
|
* if/when this and the other given CompletableFuture both |
484 |
|
|
* complete. If this and/or the other CompletableFuture complete |
485 |
|
|
* exceptionally, then the returned CompletableFuture also does |
486 |
|
|
* so, with a RuntimeException having the one of the exceptions as |
487 |
|
|
* its cause. |
488 |
|
|
* |
489 |
|
|
* @param other the other CompletableFuture |
490 |
|
|
* @param action the action to perform before completing the |
491 |
|
|
* returned CompletableFuture |
492 |
|
|
* @return the new CompletableFuture |
493 |
|
|
*/ |
494 |
|
|
public CompletableFuture<Void> andThenAsync(CompletableFuture<?> other, |
495 |
|
|
Runnable action) { |
496 |
|
|
return andRunnable(other, action, ForkJoinPool.commonPool()); |
497 |
|
|
} |
498 |
|
|
|
499 |
|
|
/** |
500 |
|
|
* Creates and returns a CompletableFuture that is completed |
501 |
|
|
* asynchronously using the given executor |
502 |
|
|
* if/when this and the other given CompletableFuture both |
503 |
|
|
* complete. If this and/or the other CompletableFuture complete |
504 |
|
|
* exceptionally, then the returned CompletableFuture also does |
505 |
|
|
* so, with a RuntimeException having the one of the exceptions as |
506 |
|
|
* its cause. |
507 |
|
|
* |
508 |
|
|
* @param other the other CompletableFuture |
509 |
|
|
* @param action the action to perform before completing the |
510 |
|
|
* returned CompletableFuture |
511 |
|
|
* @param executor the executor to use for asynchronous execution |
512 |
|
|
* @return the new CompletableFuture |
513 |
|
|
*/ |
514 |
|
|
public CompletableFuture<Void> andThenAsync(CompletableFuture<?> other, |
515 |
|
|
Runnable action, |
516 |
|
|
Executor executor) { |
517 |
|
|
if (executor == null) throw new NullPointerException(); |
518 |
|
|
return andRunnable(other, action, executor); |
519 |
|
|
} |
520 |
|
|
|
521 |
|
|
/** |
522 |
|
|
* Creates and returns a CompletableFuture that is completed with |
523 |
|
|
* the result of the given function of either this or the other |
524 |
|
|
* given CompletableFuture's results if/when either complete. If |
525 |
|
|
* this and/or the other CompletableFuture complete exceptionally, |
526 |
|
|
* then the returned CompletableFuture may also do so, with a |
527 |
|
|
* RuntimeException having one of these exceptions as its cause. |
528 |
|
|
* No guarantees are made about which result or exception is used |
529 |
|
|
* in the returned CompletableFuture. |
530 |
|
|
* |
531 |
|
|
* @param other the other CompletableFuture |
532 |
|
|
* @param fn the function to use to compute the value of |
533 |
|
|
* the returned CompletableFuture |
534 |
|
|
* @return the new CompletableFuture |
535 |
|
|
*/ |
536 |
|
|
public <U> CompletableFuture<U> orThen(CompletableFuture<? extends T> other, |
537 |
|
|
Function<? super T, U> fn) { |
538 |
|
|
return orFunction(other, fn, null); |
539 |
|
|
} |
540 |
|
|
|
541 |
|
|
/** |
542 |
|
|
* Creates and returns a CompletableFuture that is completed |
543 |
|
|
* asynchronously using the {@link ForkJoinPool#commonPool()} with |
544 |
|
|
* the result of the given function of either this or the other |
545 |
|
|
* given CompletableFuture's results if/when either complete. If |
546 |
|
|
* this and/or the other CompletableFuture complete exceptionally, |
547 |
|
|
* then the returned CompletableFuture may also do so, with a |
548 |
|
|
* RuntimeException having one of these exceptions as its cause. |
549 |
|
|
* No guarantees are made about which result or exception is used |
550 |
|
|
* in the returned CompletableFuture. |
551 |
|
|
* |
552 |
|
|
* @param other the other CompletableFuture |
553 |
|
|
* @param fn the function to use to compute the value of |
554 |
|
|
* the returned CompletableFuture |
555 |
|
|
* @return the new CompletableFuture |
556 |
|
|
*/ |
557 |
|
|
public <U> CompletableFuture<U> orThenAsync(CompletableFuture<? extends T> other, |
558 |
|
|
Function<? super T, U> fn) { |
559 |
|
|
return orFunction(other, fn, ForkJoinPool.commonPool()); |
560 |
|
|
} |
561 |
|
|
|
562 |
|
|
/** |
563 |
|
|
* Creates and returns a CompletableFuture that is completed |
564 |
|
|
* asynchronously using the given executor with the result of the |
565 |
|
|
* given function of either this or the other given |
566 |
|
|
* CompletableFuture's results if/when either complete. If this |
567 |
|
|
* and/or the other CompletableFuture complete exceptionally, then |
568 |
|
|
* the returned CompletableFuture may also do so, with a |
569 |
|
|
* RuntimeException having one of these exceptions as its cause. |
570 |
|
|
* No guarantees are made about which result or exception is used |
571 |
|
|
* in the returned CompletableFuture. |
572 |
|
|
* |
573 |
|
|
* @param other the other CompletableFuture |
574 |
|
|
* @param fn the function to use to compute the value of |
575 |
|
|
* the returned CompletableFuture |
576 |
|
|
* @param executor the executor to use for asynchronous execution |
577 |
|
|
* @return the new CompletableFuture |
578 |
|
|
*/ |
579 |
|
|
public <U> CompletableFuture<U> orThen(CompletableFuture<? extends T> other, |
580 |
|
|
Function<? super T, U> fn, |
581 |
|
|
Executor executor) { |
582 |
|
|
if (executor == null) throw new NullPointerException(); |
583 |
|
|
return orFunction(other, fn, executor); |
584 |
|
|
} |
585 |
|
|
|
586 |
|
|
/** |
587 |
|
|
* Creates and returns a CompletableFuture that is completed |
588 |
|
|
* after this or the other given CompletableFuture complete. If |
589 |
|
|
* this and/or the other CompletableFuture complete exceptionally, |
590 |
|
|
* then the returned CompletableFuture may also do so, with a |
591 |
|
|
* RuntimeException having one of these exceptions as its cause. |
592 |
|
|
* No guarantees are made about which exception is used in the |
593 |
|
|
* returned CompletableFuture. |
594 |
|
|
* |
595 |
|
|
* @param other the other CompletableFuture |
596 |
|
|
* @param action the action to perform before completing the |
597 |
|
|
* returned CompletableFuture |
598 |
|
|
* @return the new CompletableFuture |
599 |
|
|
*/ |
600 |
|
|
public CompletableFuture<Void> orThen(CompletableFuture<?> other, |
601 |
|
|
Runnable action) { |
602 |
|
|
return orRunnable(other, action, null); |
603 |
|
|
} |
604 |
|
|
|
605 |
|
|
/** |
606 |
|
|
* Creates and returns a CompletableFuture that is completed |
607 |
|
|
* asynchronously using the {@link ForkJoinPool#commonPool()} |
608 |
|
|
* after this or the other given CompletableFuture complete. If |
609 |
|
|
* this and/or the other CompletableFuture complete exceptionally, |
610 |
|
|
* then the returned CompletableFuture may also do so, with a |
611 |
|
|
* RuntimeException having one of these exceptions as its cause. |
612 |
|
|
* No guarantees are made about which exception is used in the |
613 |
|
|
* returned CompletableFuture. |
614 |
|
|
* |
615 |
|
|
* @param other the other CompletableFuture |
616 |
|
|
* @param action the action to perform before completing the |
617 |
|
|
* returned CompletableFuture |
618 |
|
|
* @return the new CompletableFuture |
619 |
|
|
*/ |
620 |
|
|
public CompletableFuture<Void> orThenAsync(CompletableFuture<?> other, |
621 |
|
|
Runnable action) { |
622 |
|
|
return orRunnable(other, action, ForkJoinPool.commonPool()); |
623 |
|
|
} |
624 |
|
|
|
625 |
|
|
/** |
626 |
|
|
* Creates and returns a CompletableFuture that is completed |
627 |
|
|
* asynchronously using the given executor after this or the other |
628 |
|
|
* given CompletableFuture complete. If this and/or the other |
629 |
|
|
* CompletableFuture complete exceptionally, then the returned |
630 |
|
|
* CompletableFuture may also do so, with a RuntimeException |
631 |
|
|
* having one of these exceptions as its cause. No guarantees are |
632 |
|
|
* made about which exception is used in the returned |
633 |
|
|
* CompletableFuture. |
634 |
|
|
* |
635 |
|
|
* @param other the other CompletableFuture |
636 |
|
|
* @param action the action to perform before completing the |
637 |
|
|
* returned CompletableFuture |
638 |
|
|
* @param executor the executor to use for asynchronous execution |
639 |
|
|
* @return the new CompletableFuture |
640 |
|
|
*/ |
641 |
|
|
public CompletableFuture<Void> orThenAsync(CompletableFuture<?> other, |
642 |
|
|
Runnable action, |
643 |
|
|
Executor executor) { |
644 |
|
|
if (executor == null) throw new NullPointerException(); |
645 |
|
|
return orRunnable(other, action, executor); |
646 |
|
|
} |
647 |
|
|
|
648 |
|
|
/** |
649 |
|
|
* Creates and returns a CompletableFuture that is completed after |
650 |
|
|
* performing the given action with the exception triggering this |
651 |
|
|
* CompletableFuture's completion if/when it completes |
652 |
|
|
* exceptionally. |
653 |
|
|
* |
654 |
|
|
* @param action the action to perform before completing the |
655 |
|
|
* returned CompletableFuture |
656 |
|
|
* @return the new CompletableFuture |
657 |
|
|
*/ |
658 |
|
|
public CompletableFuture<Void> exceptionally(Block<Throwable> action) { |
659 |
|
|
if (action == null) throw new NullPointerException(); |
660 |
|
|
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
661 |
|
|
ExceptionAction<T> d = null; |
662 |
jsr166 |
1.2 |
Object r; Throwable ex; |
663 |
|
|
if ((r = result) == null) { |
664 |
dl |
1.1 |
CompletionNode p = |
665 |
|
|
new CompletionNode(d = new ExceptionAction<T>(this, action, dst)); |
666 |
|
|
while ((r = result) == null) { |
667 |
|
|
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, |
668 |
|
|
p.next = completions, p)) |
669 |
|
|
break; |
670 |
|
|
} |
671 |
|
|
} |
672 |
jsr166 |
1.2 |
if (r != null && (d == null || d.compareAndSet(0, 1)) && |
673 |
dl |
1.1 |
(r instanceof AltResult) && (ex = ((AltResult)r).ex) != null) { |
674 |
|
|
try { |
675 |
|
|
action.accept(ex); |
676 |
|
|
dst.complete(null); |
677 |
|
|
} catch (Throwable rex) { |
678 |
|
|
dst.completeExceptionally(rex); |
679 |
|
|
} |
680 |
|
|
} |
681 |
|
|
if (r != null) |
682 |
|
|
postComplete(); |
683 |
|
|
return dst; |
684 |
|
|
} |
685 |
|
|
|
686 |
|
|
/** |
687 |
|
|
* Attempts to complete this CompletableFuture with |
688 |
|
|
* a {@link CancellationException}. |
689 |
|
|
* |
690 |
|
|
* @param mayInterruptIfRunning this value has no effect in this |
691 |
|
|
* implementation because interrupts are not used to control |
692 |
|
|
* processing. |
693 |
|
|
* |
694 |
|
|
* @return {@code true} if this task is now cancelled |
695 |
|
|
*/ |
696 |
|
|
public boolean cancel(boolean mayInterruptIfRunning) { |
697 |
|
|
Object r; |
698 |
|
|
while ((r = result) == null) { |
699 |
|
|
r = new AltResult(new CancellationException()); |
700 |
|
|
if (UNSAFE.compareAndSwapObject(this, RESULT, null, r)) { |
701 |
|
|
postComplete(); |
702 |
|
|
return true; |
703 |
|
|
} |
704 |
|
|
} |
705 |
|
|
return ((r instanceof AltResult) && |
706 |
|
|
(((AltResult)r).ex instanceof CancellationException)); |
707 |
|
|
} |
708 |
|
|
|
709 |
|
|
/** |
710 |
|
|
* Returns {@code true} if this CompletableFuture was cancelled |
711 |
|
|
* before it completed normally. |
712 |
|
|
* |
713 |
|
|
* @return {@code true} if this CompletableFuture was cancelled |
714 |
|
|
* before it completed normally |
715 |
|
|
*/ |
716 |
|
|
public boolean isCancelled() { |
717 |
|
|
Object r; |
718 |
|
|
return ((r = result) != null && |
719 |
|
|
(r instanceof AltResult) && |
720 |
|
|
(((AltResult)r).ex instanceof CancellationException)); |
721 |
|
|
} |
722 |
|
|
|
723 |
|
|
/** |
724 |
|
|
* Whether or not already completed, sets the value subsequently |
725 |
|
|
* returned by method get() and related methods to the given |
726 |
|
|
* value. This method is designed for use in error recovery |
727 |
|
|
* actions, and is very unlikely to be useful otherwise. |
728 |
|
|
* |
729 |
|
|
* @param value the completion value |
730 |
|
|
*/ |
731 |
|
|
public void force(T value) { |
732 |
jsr166 |
1.2 |
result = (value == null) ? NIL : value; |
733 |
dl |
1.1 |
postComplete(); |
734 |
|
|
} |
735 |
|
|
|
736 |
|
|
/** |
737 |
|
|
* Removes and signals all waiting threads and runs all completions |
738 |
|
|
*/ |
739 |
|
|
private void postComplete() { |
740 |
|
|
WaitNode q; Thread t; |
741 |
|
|
while ((q = waiters) != null) { |
742 |
|
|
if (UNSAFE.compareAndSwapObject(this, WAITERS, q, q.next) && |
743 |
|
|
(t = q.thread) != null) { |
744 |
|
|
q.thread = null; |
745 |
|
|
LockSupport.unpark(t); |
746 |
|
|
} |
747 |
|
|
} |
748 |
|
|
|
749 |
|
|
CompletionNode h; Completion c; |
750 |
|
|
while ((h = completions) != null) { |
751 |
|
|
if (UNSAFE.compareAndSwapObject(this, COMPLETIONS, h, h.next) && |
752 |
|
|
(c = h.completion) != null) |
753 |
|
|
c.run(); |
754 |
|
|
} |
755 |
|
|
} |
756 |
|
|
|
757 |
|
|
/* ------------- waiting for completions -------------- */ |
758 |
|
|
|
759 |
jsr166 |
1.2 |
/** |
760 |
dl |
1.1 |
* Heuristic spin value for waitingGet() before blocking on |
761 |
|
|
* multiprocessors |
762 |
|
|
*/ |
763 |
|
|
static final int WAITING_GET_SPINS = 256; |
764 |
|
|
|
765 |
|
|
/** |
766 |
|
|
* Returns result after waiting. |
767 |
|
|
*/ |
768 |
|
|
private T waitingGet() { |
769 |
|
|
WaitNode q = null; |
770 |
|
|
boolean queued = false, interrupted = false; |
771 |
|
|
int h = 0, spins = 0; |
772 |
|
|
for (Object r;;) { |
773 |
|
|
if ((r = result) != null) { |
774 |
|
|
if (q != null) // suppress unpark |
775 |
|
|
q.thread = null; |
776 |
|
|
postComplete(); // help release others |
777 |
|
|
if (interrupted) |
778 |
|
|
Thread.currentThread().interrupt(); |
779 |
|
|
if (r instanceof AltResult) { |
780 |
|
|
if (r != NIL) |
781 |
|
|
rethrow(((AltResult)r).ex); |
782 |
|
|
return null; |
783 |
|
|
} |
784 |
|
|
return (T)r; |
785 |
|
|
} |
786 |
|
|
else if (h == 0) { |
787 |
|
|
h = ThreadLocalRandom.current().nextInt(); |
788 |
|
|
if (Runtime.getRuntime().availableProcessors() > 1) |
789 |
|
|
spins = WAITING_GET_SPINS; |
790 |
|
|
} |
791 |
|
|
else if (spins > 0) { |
792 |
|
|
h ^= h << 1; // xorshift |
793 |
jsr166 |
1.2 |
h ^= h >>> 3; |
794 |
dl |
1.1 |
if ((h ^= h << 10) >= 0) |
795 |
|
|
--spins; |
796 |
jsr166 |
1.2 |
} |
797 |
dl |
1.1 |
else if (q == null) |
798 |
|
|
q = new WaitNode(); |
799 |
|
|
else if (!queued) |
800 |
|
|
queued = UNSAFE.compareAndSwapObject(this, WAITERS, |
801 |
|
|
q.next = waiters, q); |
802 |
|
|
else if (Thread.interrupted()) |
803 |
|
|
interrupted = true; |
804 |
|
|
else if (q.thread == null) |
805 |
|
|
q.thread = Thread.currentThread(); |
806 |
|
|
else |
807 |
|
|
LockSupport.park(this); |
808 |
|
|
} |
809 |
|
|
} |
810 |
|
|
|
811 |
|
|
/** |
812 |
|
|
* Awaits completion or aborts on interrupt or timeout. |
813 |
|
|
* |
814 |
|
|
* @param nanos time to wait |
815 |
|
|
* @return raw result |
816 |
|
|
*/ |
817 |
|
|
private Object timedAwaitDone(long nanos) |
818 |
|
|
throws InterruptedException, TimeoutException { |
819 |
|
|
final long deadline = System.nanoTime() + nanos; |
820 |
|
|
WaitNode q = null; |
821 |
|
|
boolean queued = false; |
822 |
|
|
for (Object r;;) { |
823 |
|
|
if (Thread.interrupted()) { |
824 |
|
|
removeWaiter(q); |
825 |
|
|
throw new InterruptedException(); |
826 |
|
|
} |
827 |
|
|
else if ((r = result) != null) { |
828 |
|
|
if (q != null) |
829 |
|
|
q.thread = null; |
830 |
|
|
postComplete(); |
831 |
|
|
return r; |
832 |
|
|
} |
833 |
|
|
else if (q == null) |
834 |
|
|
q = new WaitNode(); |
835 |
|
|
else if (!queued) |
836 |
|
|
queued = UNSAFE.compareAndSwapObject(this, WAITERS, |
837 |
|
|
q.next = waiters, q); |
838 |
|
|
else if ((nanos = deadline - System.nanoTime()) <= 0L) { |
839 |
|
|
removeWaiter(q); |
840 |
|
|
throw new TimeoutException(); |
841 |
|
|
} |
842 |
|
|
else if (q.thread == null) |
843 |
|
|
q.thread = Thread.currentThread(); |
844 |
|
|
else |
845 |
|
|
LockSupport.parkNanos(this, nanos); |
846 |
|
|
} |
847 |
|
|
} |
848 |
|
|
|
849 |
|
|
/** |
850 |
|
|
* Tries to unlink a timed-out or interrupted wait node to avoid |
851 |
|
|
* accumulating garbage. Internal nodes are simply unspliced |
852 |
|
|
* without CAS since it is harmless if they are traversed anyway |
853 |
|
|
* by releasers. To avoid effects of unsplicing from already |
854 |
|
|
* removed nodes, the list is retraversed in case of an apparent |
855 |
|
|
* race. This is slow when there are a lot of nodes, but we don't |
856 |
|
|
* expect lists to be long enough to outweigh higher-overhead |
857 |
|
|
* schemes. |
858 |
|
|
*/ |
859 |
|
|
private void removeWaiter(WaitNode node) { |
860 |
|
|
if (node != null) { |
861 |
|
|
node.thread = null; |
862 |
|
|
retry: |
863 |
|
|
for (;;) { // restart on removeWaiter race |
864 |
|
|
for (WaitNode pred = null, q = waiters, s; q != null; q = s) { |
865 |
|
|
s = q.next; |
866 |
|
|
if (q.thread != null) |
867 |
|
|
pred = q; |
868 |
|
|
else if (pred != null) { |
869 |
|
|
pred.next = s; |
870 |
|
|
if (pred.thread == null) // check for race |
871 |
|
|
continue retry; |
872 |
|
|
} |
873 |
|
|
else if (!UNSAFE.compareAndSwapObject(this, WAITERS, q, s)) |
874 |
|
|
continue retry; |
875 |
|
|
} |
876 |
|
|
break; |
877 |
|
|
} |
878 |
|
|
} |
879 |
|
|
} |
880 |
|
|
|
881 |
|
|
/* ------------- Async tasks -------------- */ |
882 |
|
|
|
883 |
|
|
/** Base class can act as either FJ or plain Runnable */ |
884 |
|
|
static abstract class Async extends ForkJoinTask<Void> implements Runnable { |
885 |
|
|
public final Void getRawResult() { return null; } |
886 |
|
|
public final void setRawResult(Void v) { } |
887 |
|
|
public final void run() { exec(); } |
888 |
|
|
} |
889 |
|
|
|
890 |
|
|
static final class AsyncRunnable extends Async { |
891 |
|
|
final Runnable runnable; |
892 |
|
|
final CompletableFuture<Void> dst; |
893 |
|
|
AsyncRunnable(Runnable runnable, CompletableFuture<Void> dst) { |
894 |
|
|
this.runnable = runnable; this.dst = dst; |
895 |
|
|
} |
896 |
|
|
public final boolean exec() { |
897 |
|
|
Runnable fn; |
898 |
|
|
CompletableFuture<Void> d; |
899 |
|
|
if ((fn = this.runnable) == null || (d = this.dst) == null) |
900 |
|
|
throw new NullPointerException(); |
901 |
|
|
try { |
902 |
|
|
fn.run(); |
903 |
|
|
d.complete(null); |
904 |
|
|
} catch (Throwable ex) { |
905 |
|
|
d.completeExceptionally(ex); |
906 |
|
|
} |
907 |
|
|
return true; |
908 |
|
|
} |
909 |
|
|
private static final long serialVersionUID = 5232453952276885070L; |
910 |
|
|
} |
911 |
|
|
|
912 |
|
|
static final class AsyncSupplier<U> extends Async { |
913 |
|
|
final Supplier<U> supplier; |
914 |
|
|
final CompletableFuture<U> dst; |
915 |
|
|
AsyncSupplier(Supplier<U> supplier, CompletableFuture<U> dst) { |
916 |
|
|
this.supplier = supplier; this.dst = dst; |
917 |
|
|
} |
918 |
|
|
public final boolean exec() { |
919 |
|
|
Supplier<U> fn; |
920 |
|
|
CompletableFuture<U> d; |
921 |
|
|
if ((fn = this.supplier) == null || (d = this.dst) == null) |
922 |
|
|
throw new NullPointerException(); |
923 |
|
|
try { |
924 |
|
|
d.complete(fn.get()); |
925 |
|
|
} catch (Throwable ex) { |
926 |
|
|
d.completeExceptionally(ex); |
927 |
|
|
} |
928 |
|
|
return true; |
929 |
|
|
} |
930 |
|
|
private static final long serialVersionUID = 5232453952276885070L; |
931 |
|
|
} |
932 |
|
|
|
933 |
|
|
static final class AsyncFunction<T,U> extends Async { |
934 |
|
|
Function<? super T,? extends U> fn; |
935 |
|
|
T arg; |
936 |
|
|
final CompletableFuture<U> dst; |
937 |
|
|
AsyncFunction(T arg, Function<? super T,? extends U> fn, |
938 |
|
|
CompletableFuture<U> dst) { |
939 |
|
|
this.arg = arg; this.fn = fn; this.dst = dst; |
940 |
|
|
} |
941 |
|
|
public final boolean exec() { |
942 |
|
|
Function<? super T,? extends U> fn; |
943 |
|
|
CompletableFuture<U> d; |
944 |
|
|
if ((fn = this.fn) == null || (d = this.dst) == null) |
945 |
|
|
throw new NullPointerException(); |
946 |
|
|
try { |
947 |
|
|
d.complete(fn.apply(arg)); |
948 |
|
|
} catch (Throwable ex) { |
949 |
|
|
d.completeExceptionally(ex); |
950 |
|
|
} |
951 |
|
|
return true; |
952 |
|
|
} |
953 |
|
|
private static final long serialVersionUID = 5232453952276885070L; |
954 |
|
|
} |
955 |
|
|
|
956 |
|
|
static final class AsyncBiFunction<T,U,V> extends Async { |
957 |
|
|
final BiFunction<? super T,? super U,? extends V> fn; |
958 |
|
|
final T arg1; |
959 |
|
|
final U arg2; |
960 |
|
|
final CompletableFuture<V> dst; |
961 |
|
|
AsyncBiFunction(T arg1, U arg2, |
962 |
|
|
BiFunction<? super T,? super U,? extends V> fn, |
963 |
|
|
CompletableFuture<V> dst) { |
964 |
|
|
this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; this.dst = dst; |
965 |
|
|
} |
966 |
|
|
public final boolean exec() { |
967 |
|
|
BiFunction<? super T,? super U,? extends V> fn; |
968 |
|
|
CompletableFuture<V> d; |
969 |
|
|
if ((fn = this.fn) == null || (d = this.dst) == null) |
970 |
|
|
throw new NullPointerException(); |
971 |
|
|
try { |
972 |
|
|
d.complete(fn.apply(arg1, arg2)); |
973 |
|
|
} catch (Throwable ex) { |
974 |
|
|
d.completeExceptionally(ex); |
975 |
|
|
} |
976 |
|
|
return true; |
977 |
|
|
} |
978 |
|
|
private static final long serialVersionUID = 5232453952276885070L; |
979 |
|
|
} |
980 |
|
|
|
981 |
|
|
/* ------------- Completions -------------- */ |
982 |
|
|
|
983 |
|
|
// Opportunistically subclass AtomicInteger to use compareAndSet to claim. |
984 |
|
|
static abstract class Completion extends AtomicInteger implements Runnable { |
985 |
|
|
} |
986 |
|
|
|
987 |
|
|
static final class ThenFunction<T,U> extends Completion { |
988 |
jsr166 |
1.2 |
final CompletableFuture<? extends T> src; |
989 |
|
|
final Function<? super T,? extends U> fn; |
990 |
|
|
final CompletableFuture<U> dst; |
991 |
dl |
1.1 |
final Executor executor; |
992 |
|
|
ThenFunction(CompletableFuture<? extends T> src, |
993 |
|
|
final Function<? super T,? extends U> fn, |
994 |
|
|
final CompletableFuture<U> dst, Executor executor) { |
995 |
|
|
this.src = src; this.fn = fn; this.dst = dst; |
996 |
|
|
this.executor = executor; |
997 |
|
|
} |
998 |
jsr166 |
1.2 |
public void run() { |
999 |
dl |
1.1 |
CompletableFuture<? extends T> a; |
1000 |
|
|
Function<? super T,? extends U> fn; |
1001 |
|
|
CompletableFuture<U> dst; |
1002 |
jsr166 |
1.2 |
Object r; T t; Throwable ex; |
1003 |
|
|
if ((dst = this.dst) != null && |
1004 |
dl |
1.1 |
(fn = this.fn) != null && |
1005 |
|
|
(a = this.src) != null && |
1006 |
|
|
(r = a.result) != null && |
1007 |
|
|
compareAndSet(0, 1)) { |
1008 |
jsr166 |
1.2 |
if (r instanceof AltResult) { |
1009 |
dl |
1.1 |
if ((ex = ((AltResult)r).ex) != null) { |
1010 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1011 |
|
|
return; |
1012 |
|
|
} |
1013 |
|
|
t = null; |
1014 |
|
|
} |
1015 |
|
|
else |
1016 |
|
|
t = (T) r; |
1017 |
|
|
try { |
1018 |
|
|
if (executor != null) |
1019 |
|
|
executor.execute(new AsyncFunction(t, fn, dst)); |
1020 |
|
|
else |
1021 |
|
|
dst.complete(fn.apply(t)); |
1022 |
|
|
} catch (Throwable rex) { |
1023 |
|
|
dst.completeExceptionally(rex); |
1024 |
|
|
} |
1025 |
|
|
} |
1026 |
|
|
} |
1027 |
|
|
} |
1028 |
|
|
|
1029 |
|
|
static final class ThenRunnable<T> extends Completion { |
1030 |
jsr166 |
1.2 |
final CompletableFuture<? extends T> src; |
1031 |
|
|
final Runnable fn; |
1032 |
|
|
final CompletableFuture<Void> dst; |
1033 |
dl |
1.1 |
final Executor executor; |
1034 |
|
|
ThenRunnable(CompletableFuture<? extends T> src, |
1035 |
|
|
Runnable fn, |
1036 |
|
|
CompletableFuture<Void> dst, |
1037 |
|
|
Executor executor) { |
1038 |
|
|
this.src = src; this.fn = fn; this.dst = dst; |
1039 |
|
|
this.executor = executor; |
1040 |
|
|
} |
1041 |
jsr166 |
1.2 |
public void run() { |
1042 |
dl |
1.1 |
CompletableFuture<? extends T> a; |
1043 |
|
|
Runnable fn; |
1044 |
|
|
CompletableFuture<Void> dst; |
1045 |
jsr166 |
1.2 |
Object r; Throwable ex; |
1046 |
|
|
if ((dst = this.dst) != null && |
1047 |
dl |
1.1 |
(fn = this.fn) != null && |
1048 |
|
|
(a = this.src) != null && |
1049 |
|
|
(r = a.result) != null && |
1050 |
|
|
compareAndSet(0, 1)) { |
1051 |
jsr166 |
1.2 |
if (r instanceof AltResult) { |
1052 |
dl |
1.1 |
if ((ex = ((AltResult)r).ex) != null) { |
1053 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1054 |
|
|
return; |
1055 |
|
|
} |
1056 |
|
|
} |
1057 |
|
|
try { |
1058 |
|
|
if (executor != null) |
1059 |
|
|
executor.execute(new AsyncRunnable(fn, dst)); |
1060 |
|
|
else { |
1061 |
|
|
fn.run(); |
1062 |
|
|
dst.complete(null); |
1063 |
|
|
} |
1064 |
|
|
} catch (Throwable rex) { |
1065 |
|
|
dst.completeExceptionally(rex); |
1066 |
|
|
} |
1067 |
|
|
} |
1068 |
|
|
} |
1069 |
|
|
} |
1070 |
|
|
|
1071 |
|
|
static final class AndFunction<T,U,V> extends Completion { |
1072 |
jsr166 |
1.2 |
final CompletableFuture<? extends T> src; |
1073 |
|
|
final CompletableFuture<? extends U> snd; |
1074 |
|
|
final BiFunction<? super T,? super U,? extends V> fn; |
1075 |
|
|
final CompletableFuture<V> dst; |
1076 |
dl |
1.1 |
final Executor executor; |
1077 |
|
|
AndFunction(CompletableFuture<? extends T> src, |
1078 |
|
|
CompletableFuture<? extends U> snd, |
1079 |
|
|
BiFunction<? super T,? super U,? extends V> fn, |
1080 |
|
|
CompletableFuture<V> dst, Executor executor) { |
1081 |
|
|
this.src = src; this.snd = snd; |
1082 |
|
|
this.fn = fn; this.dst = dst; |
1083 |
|
|
this.executor = executor; |
1084 |
|
|
} |
1085 |
jsr166 |
1.2 |
public void run() { |
1086 |
|
|
Object r, s; T t; U u; Throwable ex; |
1087 |
dl |
1.1 |
CompletableFuture<? extends T> a; |
1088 |
|
|
CompletableFuture<? extends U> b; |
1089 |
|
|
BiFunction<? super T,? super U,? extends V> fn; |
1090 |
|
|
CompletableFuture<V> dst; |
1091 |
jsr166 |
1.2 |
if ((dst = this.dst) != null && |
1092 |
dl |
1.1 |
(fn = this.fn) != null && |
1093 |
|
|
(a = this.src) != null && |
1094 |
|
|
(r = a.result) != null && |
1095 |
|
|
(b = this.snd) != null && |
1096 |
|
|
(s = b.result) != null && |
1097 |
|
|
compareAndSet(0, 1)) { |
1098 |
jsr166 |
1.2 |
if (r instanceof AltResult) { |
1099 |
dl |
1.1 |
if ((ex = ((AltResult)r).ex) != null) { |
1100 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1101 |
|
|
return; |
1102 |
|
|
} |
1103 |
jsr166 |
1.2 |
t = null; |
1104 |
|
|
} |
1105 |
|
|
else |
1106 |
|
|
t = (T) r; |
1107 |
|
|
if (s instanceof AltResult) { |
1108 |
dl |
1.1 |
if ((ex = ((AltResult)s).ex) != null) { |
1109 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1110 |
|
|
return; |
1111 |
|
|
} |
1112 |
jsr166 |
1.2 |
u = null; |
1113 |
|
|
} |
1114 |
|
|
else |
1115 |
|
|
u = (U) s; |
1116 |
dl |
1.1 |
try { |
1117 |
|
|
if (executor != null) |
1118 |
|
|
executor.execute(new AsyncBiFunction<T,U,V>(t, u, fn, dst)); |
1119 |
|
|
else |
1120 |
|
|
dst.complete(fn.apply(t, u)); |
1121 |
|
|
} catch (Throwable rex) { |
1122 |
|
|
dst.completeExceptionally(rex); |
1123 |
|
|
} |
1124 |
jsr166 |
1.2 |
} |
1125 |
|
|
} |
1126 |
dl |
1.1 |
} |
1127 |
|
|
|
1128 |
|
|
static final class AndRunnable<T> extends Completion { |
1129 |
jsr166 |
1.2 |
final CompletableFuture<? extends T> src; |
1130 |
|
|
final CompletableFuture<?> snd; |
1131 |
|
|
final Runnable fn; |
1132 |
|
|
final CompletableFuture<Void> dst; |
1133 |
dl |
1.1 |
final Executor executor; |
1134 |
|
|
AndRunnable(CompletableFuture<? extends T> src, |
1135 |
|
|
CompletableFuture<?> snd, |
1136 |
|
|
Runnable fn, |
1137 |
|
|
CompletableFuture<Void> dst, Executor executor) { |
1138 |
|
|
this.src = src; this.snd = snd; |
1139 |
|
|
this.fn = fn; this.dst = dst; |
1140 |
|
|
this.executor = executor; |
1141 |
|
|
} |
1142 |
jsr166 |
1.2 |
public void run() { |
1143 |
|
|
Object r, s; Throwable ex; |
1144 |
dl |
1.1 |
final CompletableFuture<? extends T> a; |
1145 |
|
|
final CompletableFuture<?> b; |
1146 |
|
|
final Runnable fn; |
1147 |
|
|
final CompletableFuture<Void> dst; |
1148 |
jsr166 |
1.2 |
if ((dst = this.dst) != null && |
1149 |
dl |
1.1 |
(fn = this.fn) != null && |
1150 |
|
|
(a = this.src) != null && |
1151 |
|
|
(r = a.result) != null && |
1152 |
|
|
(b = this.snd) != null && |
1153 |
|
|
(s = b.result) != null && |
1154 |
|
|
compareAndSet(0, 1)) { |
1155 |
jsr166 |
1.2 |
if (r instanceof AltResult) { |
1156 |
dl |
1.1 |
if ((ex = ((AltResult)r).ex) != null) { |
1157 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1158 |
|
|
return; |
1159 |
|
|
} |
1160 |
jsr166 |
1.2 |
} |
1161 |
|
|
if (s instanceof AltResult) { |
1162 |
dl |
1.1 |
if ((ex = ((AltResult)s).ex) != null) { |
1163 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1164 |
|
|
return; |
1165 |
|
|
} |
1166 |
jsr166 |
1.2 |
} |
1167 |
dl |
1.1 |
try { |
1168 |
|
|
if (executor != null) |
1169 |
|
|
executor.execute(new AsyncRunnable(fn, dst)); |
1170 |
|
|
else { |
1171 |
|
|
fn.run(); |
1172 |
|
|
dst.complete(null); |
1173 |
|
|
} |
1174 |
|
|
} catch (Throwable rex) { |
1175 |
|
|
dst.completeExceptionally(rex); |
1176 |
|
|
} |
1177 |
jsr166 |
1.2 |
} |
1178 |
|
|
} |
1179 |
dl |
1.1 |
} |
1180 |
|
|
|
1181 |
|
|
static final class OrFunction<T,U> extends Completion { |
1182 |
jsr166 |
1.2 |
final CompletableFuture<? extends T> src; |
1183 |
|
|
final CompletableFuture<? extends T> snd; |
1184 |
|
|
final Function<? super T,? extends U> fn; |
1185 |
|
|
final CompletableFuture<U> dst; |
1186 |
dl |
1.1 |
final Executor executor; |
1187 |
|
|
OrFunction(CompletableFuture<? extends T> src, |
1188 |
|
|
CompletableFuture<? extends T> snd, |
1189 |
|
|
Function<? super T,? extends U> fn, |
1190 |
|
|
CompletableFuture<U> dst, Executor executor) { |
1191 |
|
|
this.src = src; this.snd = snd; |
1192 |
|
|
this.fn = fn; this.dst = dst; |
1193 |
|
|
this.executor = executor; |
1194 |
|
|
} |
1195 |
jsr166 |
1.2 |
public void run() { |
1196 |
|
|
Object r; T t; Throwable ex; |
1197 |
dl |
1.1 |
CompletableFuture<? extends T> a; |
1198 |
|
|
CompletableFuture<? extends T> b; |
1199 |
|
|
Function<? super T,? extends U> fn; |
1200 |
|
|
CompletableFuture<U> dst; |
1201 |
jsr166 |
1.2 |
if ((dst = this.dst) != null && |
1202 |
dl |
1.1 |
(fn = this.fn) != null && |
1203 |
|
|
(((a = this.src) != null && (r = a.result) != null) || |
1204 |
|
|
((b = this.snd) != null && (r = b.result) != null)) && |
1205 |
|
|
compareAndSet(0, 1)) { |
1206 |
jsr166 |
1.2 |
if (r instanceof AltResult) { |
1207 |
dl |
1.1 |
if ((ex = ((AltResult)r).ex) != null) { |
1208 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1209 |
|
|
return; |
1210 |
|
|
} |
1211 |
jsr166 |
1.2 |
t = null; |
1212 |
|
|
} |
1213 |
|
|
else |
1214 |
|
|
t = (T) r; |
1215 |
dl |
1.1 |
try { |
1216 |
|
|
if (executor != null) |
1217 |
|
|
executor.execute(new AsyncFunction(t, fn, dst)); |
1218 |
|
|
else |
1219 |
|
|
dst.complete(fn.apply(t)); |
1220 |
|
|
} catch (Throwable rex) { |
1221 |
|
|
dst.completeExceptionally(rex); |
1222 |
|
|
} |
1223 |
jsr166 |
1.2 |
} |
1224 |
|
|
} |
1225 |
dl |
1.1 |
} |
1226 |
|
|
|
1227 |
|
|
static final class OrRunnable<T> extends Completion { |
1228 |
jsr166 |
1.2 |
final CompletableFuture<? extends T> src; |
1229 |
|
|
final CompletableFuture<?> snd; |
1230 |
|
|
final Runnable fn; |
1231 |
|
|
final CompletableFuture<Void> dst; |
1232 |
dl |
1.1 |
final Executor executor; |
1233 |
|
|
OrRunnable(CompletableFuture<? extends T> src, |
1234 |
|
|
CompletableFuture<?> snd, |
1235 |
|
|
Runnable fn, |
1236 |
|
|
CompletableFuture<Void> dst, Executor executor) { |
1237 |
|
|
this.src = src; this.snd = snd; |
1238 |
|
|
this.fn = fn; this.dst = dst; |
1239 |
|
|
this.executor = executor; |
1240 |
|
|
} |
1241 |
jsr166 |
1.2 |
public void run() { |
1242 |
|
|
Object r; Throwable ex; |
1243 |
dl |
1.1 |
CompletableFuture<? extends T> a; |
1244 |
|
|
final CompletableFuture<?> b; |
1245 |
|
|
final Runnable fn; |
1246 |
|
|
final CompletableFuture<Void> dst; |
1247 |
jsr166 |
1.2 |
if ((dst = this.dst) != null && |
1248 |
dl |
1.1 |
(fn = this.fn) != null && |
1249 |
|
|
(((a = this.src) != null && (r = a.result) != null) || |
1250 |
|
|
((b = this.snd) != null && (r = b.result) != null)) && |
1251 |
|
|
compareAndSet(0, 1)) { |
1252 |
jsr166 |
1.2 |
if ((r instanceof AltResult) && |
1253 |
dl |
1.1 |
(ex = ((AltResult)r).ex) != null) { |
1254 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1255 |
|
|
} |
1256 |
jsr166 |
1.2 |
else { |
1257 |
dl |
1.1 |
try { |
1258 |
|
|
if (executor != null) |
1259 |
|
|
executor.execute(new AsyncRunnable(fn, dst)); |
1260 |
|
|
else { |
1261 |
|
|
fn.run(); |
1262 |
|
|
dst.complete(null); |
1263 |
|
|
} |
1264 |
|
|
} catch (Throwable rex) { |
1265 |
|
|
dst.completeExceptionally(rex); |
1266 |
|
|
} |
1267 |
|
|
} |
1268 |
jsr166 |
1.2 |
} |
1269 |
|
|
} |
1270 |
dl |
1.1 |
} |
1271 |
|
|
|
1272 |
|
|
static final class ExceptionAction<T> extends Completion { |
1273 |
jsr166 |
1.2 |
final CompletableFuture<? extends T> src; |
1274 |
|
|
final Block<? super Throwable> fn; |
1275 |
|
|
final CompletableFuture<Void> dst; |
1276 |
dl |
1.1 |
ExceptionAction(CompletableFuture<? extends T> src, |
1277 |
|
|
Block<? super Throwable> fn, |
1278 |
|
|
CompletableFuture<Void> dst) { |
1279 |
|
|
this.src = src; this.fn = fn; this.dst = dst; |
1280 |
|
|
} |
1281 |
jsr166 |
1.2 |
public void run() { |
1282 |
dl |
1.1 |
CompletableFuture<? extends T> a; |
1283 |
|
|
Block<? super Throwable> fn; |
1284 |
|
|
CompletableFuture<Void> dst; |
1285 |
jsr166 |
1.2 |
Object r; Throwable ex; |
1286 |
|
|
if ((dst = this.dst) != null && |
1287 |
dl |
1.1 |
(fn = this.fn) != null && |
1288 |
|
|
(a = this.src) != null && |
1289 |
|
|
(r = a.result) != null && |
1290 |
|
|
compareAndSet(0, 1)) { |
1291 |
|
|
if ((r instanceof AltResult) && |
1292 |
|
|
(ex = ((AltResult)r).ex) != null) { |
1293 |
|
|
try { |
1294 |
|
|
fn.accept(ex); |
1295 |
|
|
dst.complete(null); |
1296 |
|
|
} catch (Throwable rex) { |
1297 |
|
|
dst.completeExceptionally(rex); |
1298 |
|
|
} |
1299 |
|
|
} |
1300 |
|
|
} |
1301 |
|
|
} |
1302 |
|
|
} |
1303 |
|
|
|
1304 |
|
|
/* ------------- then/and/or implementations -------------- */ |
1305 |
|
|
|
1306 |
|
|
private <U> CompletableFuture<U> thenFunction(Function<? super T,? extends U> fn, |
1307 |
|
|
Executor executor) { |
1308 |
|
|
|
1309 |
|
|
if (fn == null) throw new NullPointerException(); |
1310 |
|
|
CompletableFuture<U> dst = new CompletableFuture<U>(); |
1311 |
|
|
ThenFunction<T,U> d = null; |
1312 |
jsr166 |
1.2 |
Object r; |
1313 |
|
|
if ((r = result) == null) { |
1314 |
dl |
1.1 |
CompletionNode p = new CompletionNode |
1315 |
|
|
(d = new ThenFunction<T,U>(this, fn, dst, executor)); |
1316 |
|
|
while ((r = result) == null) { |
1317 |
|
|
if (UNSAFE.compareAndSwapObject |
1318 |
|
|
(this, COMPLETIONS, p.next = completions, p)) |
1319 |
|
|
break; |
1320 |
|
|
} |
1321 |
|
|
} |
1322 |
jsr166 |
1.2 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1323 |
|
|
T t; Throwable ex = null; |
1324 |
|
|
if (r instanceof AltResult) { |
1325 |
dl |
1.1 |
if ((ex = ((AltResult)r).ex) != null) |
1326 |
jsr166 |
1.2 |
dst.completeExceptionally(new RuntimeException(ex)); |
1327 |
|
|
t = null; |
1328 |
dl |
1.1 |
} |
1329 |
|
|
else |
1330 |
jsr166 |
1.2 |
t = (T) r; |
1331 |
|
|
if (ex == null) { |
1332 |
dl |
1.1 |
try { |
1333 |
|
|
if (executor != null) |
1334 |
|
|
executor.execute(new AsyncFunction(t, fn, dst)); |
1335 |
|
|
else |
1336 |
|
|
dst.complete(fn.apply(t)); |
1337 |
|
|
} catch (Throwable rex) { |
1338 |
|
|
dst.completeExceptionally(rex); |
1339 |
|
|
} |
1340 |
|
|
} |
1341 |
jsr166 |
1.2 |
postComplete(); |
1342 |
|
|
} |
1343 |
dl |
1.1 |
return dst; |
1344 |
|
|
} |
1345 |
|
|
|
1346 |
jsr166 |
1.2 |
private CompletableFuture<Void> thenRunnable(Runnable action, |
1347 |
dl |
1.1 |
Executor executor) { |
1348 |
|
|
if (action == null) throw new NullPointerException(); |
1349 |
|
|
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1350 |
|
|
ThenRunnable<T> d = null; |
1351 |
jsr166 |
1.2 |
Object r; |
1352 |
|
|
if ((r = result) == null) { |
1353 |
dl |
1.1 |
CompletionNode p = new CompletionNode |
1354 |
|
|
(d = new ThenRunnable<T>(this, action, dst, executor)); |
1355 |
|
|
while ((r = result) == null) { |
1356 |
|
|
if (UNSAFE.compareAndSwapObject |
1357 |
|
|
(this, COMPLETIONS, p.next = completions, p)) |
1358 |
|
|
break; |
1359 |
|
|
} |
1360 |
|
|
} |
1361 |
jsr166 |
1.2 |
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1362 |
dl |
1.1 |
Throwable ex = null; |
1363 |
jsr166 |
1.2 |
if (r instanceof AltResult) { |
1364 |
dl |
1.1 |
if ((ex = ((AltResult)r).ex) != null) |
1365 |
jsr166 |
1.2 |
dst.completeExceptionally(new RuntimeException(ex)); |
1366 |
dl |
1.1 |
} |
1367 |
jsr166 |
1.2 |
if (ex == null) { |
1368 |
dl |
1.1 |
try { |
1369 |
|
|
if (executor != null) |
1370 |
|
|
executor.execute(new AsyncRunnable(action, dst)); |
1371 |
|
|
else { |
1372 |
|
|
action.run(); |
1373 |
|
|
dst.complete(null); |
1374 |
|
|
} |
1375 |
|
|
} catch (Throwable rex) { |
1376 |
|
|
dst.completeExceptionally(rex); |
1377 |
|
|
} |
1378 |
|
|
} |
1379 |
jsr166 |
1.2 |
postComplete(); |
1380 |
|
|
} |
1381 |
dl |
1.1 |
return dst; |
1382 |
|
|
} |
1383 |
|
|
|
1384 |
|
|
private <U,V> CompletableFuture<V> andFunction(CompletableFuture<? extends U> other, |
1385 |
|
|
BiFunction<? super T,? super U,? extends V> fn, |
1386 |
|
|
Executor executor) { |
1387 |
|
|
if (other == null || fn == null) throw new NullPointerException(); |
1388 |
jsr166 |
1.2 |
CompletableFuture<V> dst = new CompletableFuture<V>(); |
1389 |
|
|
AndFunction<T,U,V> d = null; |
1390 |
|
|
Object r, s = null; |
1391 |
|
|
if ((r = result) == null || (s = other.result) == null) { |
1392 |
dl |
1.1 |
d = new AndFunction<T,U,V>(this, other, fn, dst, executor); |
1393 |
|
|
CompletionNode q = null, p = new CompletionNode(d); |
1394 |
|
|
while ((r == null && (r = result) == null) || |
1395 |
|
|
(s == null && (s = other.result) == null)) { |
1396 |
|
|
if (q != null) { |
1397 |
|
|
if (s != null || |
1398 |
|
|
UNSAFE.compareAndSwapObject |
1399 |
|
|
(other, COMPLETIONS, q.next = other.completions, q)) |
1400 |
|
|
break; |
1401 |
|
|
} |
1402 |
|
|
else if (r != null || |
1403 |
|
|
UNSAFE.compareAndSwapObject |
1404 |
|
|
(this, COMPLETIONS, p.next = completions, p)) { |
1405 |
|
|
if (s != null) |
1406 |
|
|
break; |
1407 |
|
|
q = new CompletionNode(d); |
1408 |
|
|
} |
1409 |
|
|
} |
1410 |
|
|
} |
1411 |
jsr166 |
1.2 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
1412 |
|
|
T t; U u; Throwable ex = null; |
1413 |
|
|
if (r instanceof AltResult) { |
1414 |
dl |
1.1 |
if ((ex = ((AltResult)r).ex) != null) |
1415 |
jsr166 |
1.2 |
dst.completeExceptionally(new RuntimeException(ex)); |
1416 |
|
|
t = null; |
1417 |
dl |
1.1 |
} |
1418 |
|
|
else |
1419 |
jsr166 |
1.2 |
t = (T) r; |
1420 |
dl |
1.1 |
if (ex != null) |
1421 |
|
|
u = null; |
1422 |
|
|
else if (s instanceof AltResult) { |
1423 |
|
|
if ((ex = ((AltResult)s).ex) != null) |
1424 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1425 |
|
|
u = null; |
1426 |
|
|
} |
1427 |
|
|
else |
1428 |
jsr166 |
1.2 |
u = (U) s; |
1429 |
|
|
if (ex == null) { |
1430 |
dl |
1.1 |
try { |
1431 |
|
|
if (executor != null) |
1432 |
|
|
executor.execute(new AsyncBiFunction<T,U,V>(t, u, fn, dst)); |
1433 |
|
|
else |
1434 |
|
|
dst.complete(fn.apply(t, u)); |
1435 |
|
|
} catch (Throwable rex) { |
1436 |
|
|
dst.completeExceptionally(rex); |
1437 |
|
|
} |
1438 |
|
|
} |
1439 |
jsr166 |
1.2 |
} |
1440 |
dl |
1.1 |
if (r != null) |
1441 |
|
|
postComplete(); |
1442 |
|
|
if (s != null) |
1443 |
|
|
other.postComplete(); |
1444 |
jsr166 |
1.2 |
return dst; |
1445 |
dl |
1.1 |
} |
1446 |
|
|
|
1447 |
|
|
private CompletableFuture<Void> andRunnable(CompletableFuture<?> other, |
1448 |
|
|
Runnable action, |
1449 |
|
|
Executor executor) { |
1450 |
|
|
if (other == null || action == null) throw new NullPointerException(); |
1451 |
jsr166 |
1.2 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1452 |
|
|
AndRunnable<T> d = null; |
1453 |
|
|
Object r, s = null; |
1454 |
|
|
if ((r = result) == null || (s = other.result) == null) { |
1455 |
dl |
1.1 |
d = new AndRunnable<T>(this, other, action, dst, executor); |
1456 |
|
|
CompletionNode q = null, p = new CompletionNode(d); |
1457 |
|
|
while ((r == null && (r = result) == null) || |
1458 |
|
|
(s == null && (s = other.result) == null)) { |
1459 |
|
|
if (q != null) { |
1460 |
|
|
if (s != null || |
1461 |
|
|
UNSAFE.compareAndSwapObject |
1462 |
|
|
(other, COMPLETIONS, q.next = other.completions, q)) |
1463 |
|
|
break; |
1464 |
|
|
} |
1465 |
|
|
else if (r != null || |
1466 |
|
|
UNSAFE.compareAndSwapObject |
1467 |
|
|
(this, COMPLETIONS, p.next = completions, p)) { |
1468 |
|
|
if (s != null) |
1469 |
|
|
break; |
1470 |
|
|
q = new CompletionNode(d); |
1471 |
|
|
} |
1472 |
|
|
} |
1473 |
|
|
} |
1474 |
jsr166 |
1.2 |
if (r != null && s != null && (d == null || d.compareAndSet(0, 1))) { |
1475 |
|
|
Throwable ex = null; |
1476 |
|
|
if ((r instanceof AltResult) && |
1477 |
dl |
1.1 |
(ex = ((AltResult)r).ex) != null) |
1478 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1479 |
|
|
else if ((s instanceof AltResult) && |
1480 |
|
|
(ex = ((AltResult)s).ex) != null) |
1481 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1482 |
jsr166 |
1.2 |
else { |
1483 |
dl |
1.1 |
try { |
1484 |
|
|
if (executor != null) |
1485 |
|
|
executor.execute(new AsyncRunnable(action, dst)); |
1486 |
|
|
else { |
1487 |
|
|
action.run(); |
1488 |
|
|
dst.complete(null); |
1489 |
|
|
} |
1490 |
|
|
} catch (Throwable rex) { |
1491 |
|
|
dst.completeExceptionally(rex); |
1492 |
|
|
} |
1493 |
|
|
} |
1494 |
jsr166 |
1.2 |
} |
1495 |
dl |
1.1 |
if (r != null) |
1496 |
|
|
postComplete(); |
1497 |
|
|
if (s != null) |
1498 |
|
|
other.postComplete(); |
1499 |
jsr166 |
1.2 |
return dst; |
1500 |
dl |
1.1 |
} |
1501 |
|
|
|
1502 |
|
|
private <U> CompletableFuture<U> orFunction(CompletableFuture<? extends T> other, |
1503 |
|
|
Function<? super T, U> fn, |
1504 |
|
|
Executor executor) { |
1505 |
|
|
if (other == null || fn == null) throw new NullPointerException(); |
1506 |
jsr166 |
1.2 |
CompletableFuture<U> dst = new CompletableFuture<U>(); |
1507 |
|
|
OrFunction<T,U> d = null; |
1508 |
|
|
Object r; |
1509 |
|
|
if ((r = result) == null && (r = other.result) == null) { |
1510 |
dl |
1.1 |
d = new OrFunction<T,U>(this, other, fn, dst, executor); |
1511 |
|
|
CompletionNode q = null, p = new CompletionNode(d); |
1512 |
|
|
while ((r = result) == null && (r = other.result) == null) { |
1513 |
|
|
if (q != null) { |
1514 |
|
|
if (UNSAFE.compareAndSwapObject |
1515 |
|
|
(other, COMPLETIONS, q.next = other.completions, q)) |
1516 |
|
|
break; |
1517 |
|
|
} |
1518 |
|
|
else if (UNSAFE.compareAndSwapObject |
1519 |
|
|
(this, COMPLETIONS, p.next = completions, p)) |
1520 |
|
|
q = new CompletionNode(d); |
1521 |
|
|
} |
1522 |
jsr166 |
1.2 |
} |
1523 |
|
|
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1524 |
|
|
T t; Throwable ex = null; |
1525 |
|
|
if (r instanceof AltResult) { |
1526 |
dl |
1.1 |
if ((ex = ((AltResult)r).ex) != null) |
1527 |
jsr166 |
1.2 |
dst.completeExceptionally(new RuntimeException(ex)); |
1528 |
|
|
t = null; |
1529 |
dl |
1.1 |
} |
1530 |
|
|
else |
1531 |
jsr166 |
1.2 |
t = (T) r; |
1532 |
|
|
if (ex == null) { |
1533 |
dl |
1.1 |
try { |
1534 |
|
|
if (executor != null) |
1535 |
|
|
executor.execute(new AsyncFunction(t, fn, dst)); |
1536 |
|
|
else |
1537 |
|
|
dst.complete(fn.apply(t)); |
1538 |
|
|
} catch (Throwable rex) { |
1539 |
|
|
dst.completeExceptionally(rex); |
1540 |
|
|
} |
1541 |
|
|
} |
1542 |
jsr166 |
1.2 |
} |
1543 |
dl |
1.1 |
if (r != null) { |
1544 |
|
|
if (result != null) |
1545 |
|
|
postComplete(); |
1546 |
|
|
if (other.result != null) |
1547 |
|
|
other.postComplete(); |
1548 |
|
|
} |
1549 |
jsr166 |
1.2 |
return dst; |
1550 |
dl |
1.1 |
} |
1551 |
|
|
|
1552 |
|
|
private CompletableFuture<Void> orRunnable(CompletableFuture<?> other, |
1553 |
|
|
Runnable action, |
1554 |
|
|
Executor executor) { |
1555 |
|
|
if (other == null || action == null) throw new NullPointerException(); |
1556 |
jsr166 |
1.2 |
CompletableFuture<Void> dst = new CompletableFuture<Void>(); |
1557 |
|
|
OrRunnable<T> d = null; |
1558 |
|
|
Object r; |
1559 |
|
|
if ((r = result) == null && (r = other.result) == null) { |
1560 |
dl |
1.1 |
d = new OrRunnable<T>(this, other, action, dst, executor); |
1561 |
|
|
CompletionNode q = null, p = new CompletionNode(d); |
1562 |
|
|
while ((r = result) == null && (r = other.result) == null) { |
1563 |
|
|
if (q != null) { |
1564 |
|
|
if (UNSAFE.compareAndSwapObject |
1565 |
|
|
(other, COMPLETIONS, q.next = other.completions, q)) |
1566 |
|
|
break; |
1567 |
|
|
} |
1568 |
|
|
else if (UNSAFE.compareAndSwapObject |
1569 |
|
|
(this, COMPLETIONS, p.next = completions, p)) |
1570 |
|
|
q = new CompletionNode(d); |
1571 |
|
|
} |
1572 |
jsr166 |
1.2 |
} |
1573 |
|
|
if (r != null && (d == null || d.compareAndSet(0, 1))) { |
1574 |
|
|
Throwable ex = null; |
1575 |
|
|
if ((r instanceof AltResult) && |
1576 |
dl |
1.1 |
(ex = ((AltResult)r).ex) != null) |
1577 |
|
|
dst.completeExceptionally(new RuntimeException(ex)); |
1578 |
|
|
else { |
1579 |
|
|
try { |
1580 |
|
|
if (executor != null) |
1581 |
|
|
executor.execute(new AsyncRunnable(action, dst)); |
1582 |
|
|
else { |
1583 |
|
|
action.run(); |
1584 |
|
|
dst.complete(null); |
1585 |
|
|
} |
1586 |
|
|
} catch (Throwable rex) { |
1587 |
|
|
dst.completeExceptionally(rex); |
1588 |
|
|
} |
1589 |
|
|
} |
1590 |
jsr166 |
1.2 |
} |
1591 |
dl |
1.1 |
if (r != null) { |
1592 |
|
|
if (result != null) |
1593 |
|
|
postComplete(); |
1594 |
|
|
if (other.result != null) |
1595 |
|
|
other.postComplete(); |
1596 |
|
|
} |
1597 |
jsr166 |
1.2 |
return dst; |
1598 |
dl |
1.1 |
} |
1599 |
|
|
|
1600 |
|
|
/* ------------- misc -------------- */ |
1601 |
|
|
|
1602 |
|
|
/** |
1603 |
|
|
* A version of "sneaky throw" to relay exceptions |
1604 |
|
|
*/ |
1605 |
|
|
static void rethrow(final Throwable ex) { |
1606 |
|
|
if (ex != null) { |
1607 |
|
|
if (ex instanceof Error) |
1608 |
|
|
throw (Error)ex; |
1609 |
|
|
if (ex instanceof RuntimeException) |
1610 |
|
|
throw (RuntimeException)ex; |
1611 |
|
|
throw uncheckedThrowable(ex, RuntimeException.class); |
1612 |
|
|
} |
1613 |
|
|
} |
1614 |
|
|
|
1615 |
|
|
/** |
1616 |
|
|
* The sneaky part of sneaky throw, relying on generics |
1617 |
|
|
* limitations to evade compiler complaints about rethrowing |
1618 |
|
|
* unchecked exceptions |
1619 |
|
|
*/ |
1620 |
|
|
@SuppressWarnings("unchecked") static <T extends Throwable> |
1621 |
|
|
T uncheckedThrowable(final Throwable t, final Class<T> c) { |
1622 |
|
|
return (T)t; // rely on vacuous cast |
1623 |
|
|
} |
1624 |
|
|
|
1625 |
|
|
// Unsafe mechanics |
1626 |
|
|
private static final sun.misc.Unsafe UNSAFE; |
1627 |
|
|
private static final long RESULT; |
1628 |
|
|
private static final long WAITERS; |
1629 |
|
|
private static final long COMPLETIONS; |
1630 |
|
|
static { |
1631 |
|
|
try { |
1632 |
|
|
UNSAFE = sun.misc.Unsafe.getUnsafe(); |
1633 |
|
|
Class<?> k = CompletableFuture.class; |
1634 |
|
|
RESULT = UNSAFE.objectFieldOffset |
1635 |
|
|
(k.getDeclaredField("result")); |
1636 |
|
|
WAITERS = UNSAFE.objectFieldOffset |
1637 |
|
|
(k.getDeclaredField("waiters")); |
1638 |
|
|
COMPLETIONS = UNSAFE.objectFieldOffset |
1639 |
|
|
(k.getDeclaredField("completions")); |
1640 |
|
|
} catch (Exception e) { |
1641 |
|
|
throw new Error(e); |
1642 |
|
|
} |
1643 |
|
|
} |
1644 |
|
|
|
1645 |
|
|
} |