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1.1 |
/* |
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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.Supplier; |
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1.34 |
import java.util.function.Consumer; |
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import java.util.function.BiConsumer; |
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1.1 |
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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1.5 |
import java.util.concurrent.ThreadLocalRandom; |
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1.1 |
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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1.88 |
import java.util.concurrent.CompletionException; |
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import java.util.concurrent.CompletionStage; |
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1.1 |
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 be used as a {@link CompletionStage}, |
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* supporting dependent functions and actions that trigger upon its |
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* completion. |
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* |
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1.50 |
* <p>When two or more threads attempt to |
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* {@link #complete complete}, |
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1.52 |
* {@link #completeExceptionally completeExceptionally}, or |
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1.50 |
* {@link #cancel cancel} |
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* a CompletableFuture, only one of them succeeds. |
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1.19 |
* |
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1.91 |
* <p>In addition to these and related methods for directly |
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* manipulating status and results, CompletableFuture implements |
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* interface {@link CompletionStage} with the following policies: <ul> |
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1.35 |
* |
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1.88 |
* <li>Actions supplied for dependent completions of |
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* <em>non-async</em> methods may be performed by the thread that |
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* completes the current CompletableFuture, or by any other caller of |
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* a completion method.</li> |
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1.65 |
* |
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1.88 |
* <li>All <em>async</em> methods without an explicit Executor |
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* argument are performed using the {@link ForkJoinPool#commonPool()} |
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* (unless it does not support a parallelism level of at least two, in |
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* which case, a new Thread is used). To simplify monitoring, |
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* debugging, and tracking, all generated asynchronous tasks are |
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* instances of the marker interface {@link |
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* AsynchronousCompletionTask}. </li> |
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1.35 |
* |
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1.88 |
* <li>All CompletionStage methods are implemented independently of |
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* other public methods, so the behavior of one method is not impacted |
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* by overrides of others in subclasses. </li> </ul> |
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* |
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1.91 |
* <p>CompletableFuture also implements {@link Future} with the following |
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* policies: <ul> |
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* |
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* <li>Since (unlike {@link FutureTask}) this class has no direct |
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1.55 |
* control over the computation that causes it to be completed, |
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1.88 |
* cancellation is treated as just another form of exceptional |
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* completion. Method {@link #cancel cancel} has the same effect as |
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* {@code completeExceptionally(new CancellationException())}. Method |
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* {@link #isCompletedExceptionally} can be used to determine if a |
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* CompletableFuture completed in any exceptional fashion.</li> |
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* |
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* <li>In case of exceptional completion with a CompletionException, |
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* methods {@link #get()} and {@link #get(long, TimeUnit)} throw an |
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* {@link ExecutionException} with the same cause as held in the |
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* corresponding CompletionException. To simplify usage in most |
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* contexts, this class also defines methods {@link #join()} and |
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* {@link #getNow} that instead throw the CompletionException directly |
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* in these cases.</li> </ul> |
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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>, CompletionStage<T> { |
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|
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/* |
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* Overview: |
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* |
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* A CompletableFuture may have dependent completion actions, |
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* collected in a linked stack. It atomically completes by CASing |
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* a result field, and then pops off and runs those actions. This |
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* applies across normal vs exceptional outcomes, sync vs async |
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* actions, binary triggers, and various forms of completions. |
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* |
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* Non-nullness of field result (set via CAS) indicates done. An |
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* AltResult is used to box null as a result, as well as to hold |
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* exceptions. Using a single field makes completion simple to |
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* detect and trigger. Encoding and decoding is straightforward |
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* but adds vertical sprawl. One minor simplification relies on |
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* the (static) NIL (to box null results) being the only AltResult |
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* with a null exception field, so we don't usually need explicit |
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* comparisons with NIL. Exception propagation mechanics |
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* surrounding decoding rely on unchecked casts of decoded results |
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* really being unchecked, and user type errors being caught at |
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* point of use, as is currently the case in Java. These are |
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* highlighted by using SuppressWarnings annotated temporaries. |
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* |
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* Dependent actions are represented by Completion objects linked |
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* as Treiber stacks headed by field completions. There are four |
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* kinds of Completions: single-source (UniCompletion), two-source |
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* (BiCompletion), shared (CoBiCompletion, used by the second |
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* source of a BiCompletion), and Signallers that unblock waiters. |
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* |
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* The same patterns of methods and classes are used for each form |
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* of Completion (apply, combine, etc), and are written in a |
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* similar style. For each form X there is, when applicable: |
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* |
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* * Method nowX (for example nowApply) that immediately executes |
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* a supplied function and sets result |
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* * Class AsyncX class (for example AsyncApply) that calls nowX |
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* from another task, |
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* * Class DelayedX (for example DelayedApply) that holds |
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* arguments and calls Xnow when ready. |
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* |
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* For each public CompletionStage method M* (for example |
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* thenApply{Async}), there is a method doM (for example |
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* doThenApply) that creates and/or invokes the appropriate form. |
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* Each deals with three cases that can arise when adding a |
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* dependent completion to CompletableFuture f: |
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* |
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* * f is already complete, so the dependent action is run |
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* immediately, via a "now" method, which, if async, |
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* starts the action in a new task. |
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* * f is not complete, so a Completion action is created and |
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* pushed to f's completions. It is triggered via |
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* f.postComplete when f completes. |
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* * f is not complete, but completes while adding the completion |
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* action, so we try to trigger it upon adding (see method |
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* unipush and derivatives) to cover races. |
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* |
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* Methods with two sources (for example thenCombine) must deal |
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* with races across both while pushing actions. The second |
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* completion is an CoBiCompletion pointing to the first, shared |
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* to ensure that at most one claims and performs the action. The |
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* multiple-arity method allOf does this pairwise to form a tree |
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* of completions. (Method anyOf just uses a depth-one Or tree.) |
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* |
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* Upon setting results, method postComplete is called unless |
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* the target is guaranteed not to be observable (i.e., not yet |
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* returned or linked). Multiple threads can call postComplete, |
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* which atomically pops each dependent action, and tries to |
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* trigger it via method tryAct. Any such action must be performed |
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* only once, even if called from several threads, so Completions |
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* maintain status via CAS, and on success run one of the "now" |
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* methods. Triggering can propagate recursively, so tryAct |
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* returns a completed dependent (if one exists) for further |
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* processing by its caller. |
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* |
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* Blocking methods get() and join() rely on Signaller Completions |
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* that wake up waiting threads. The mechanics are similar to |
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* Treiber stack wait-nodes used in FutureTask, Phaser, and |
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* SynchronousQueue. See their internal documentation for |
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* algorithmic details. |
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* |
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* Without precautions, CompletableFutures would be prone to |
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* garbage accumulation as chains of completions build up, each |
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* pointing back to its sources. So we detach (null out) most |
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* Completion fields as soon as possible. To support this, |
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* internal methods check for and harmlessly ignore null arguments |
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* that may have been obtained during races with threads nulling |
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* out fields. (Some of these checked cases cannot currently |
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* happen.) Fields of Async classes can be but currently are not |
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* fully detached, because they do not in general form cycles. |
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*/ |
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volatile Object result; // Either the result or boxed AltResult |
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volatile Completion<?> completions; // Treiber stack of dependent actions |
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final boolean internalComplete(Object r) { // CAS from null to r |
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return UNSAFE.compareAndSwapObject(this, RESULT, null, r); |
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} |
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final boolean casCompletions(Completion<?> cmp, Completion<?> val) { |
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return UNSAFE.compareAndSwapObject(this, COMPLETIONS, cmp, val); |
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} |
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/* ------------- Encoding and decoding outcomes -------------- */ |
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static final class AltResult { // See above |
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final Throwable ex; // null only for NIL |
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AltResult(Throwable x) { this.ex = x; } |
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1.1 |
} |
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static final AltResult NIL = new AltResult(null); |
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1.20 |
/** |
194 |
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1.104 |
* Returns the encoding of the given (non-null) exception as a |
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* wrapped CompletionException unless it is one already. |
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1.99 |
*/ |
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1.104 |
static AltResult altThrowable(Throwable x) { |
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return new AltResult((x instanceof CompletionException) ? x : |
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new CompletionException(x)); |
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dl |
1.99 |
} |
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/** |
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1.104 |
* Returns the encoding of the given arguments: if the exception |
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* is non-null, encodes as altThrowable. Otherwise uses the given |
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* value, boxed as NIL if null. |
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1.99 |
*/ |
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1.104 |
static Object encodeOutcome(Object v, Throwable x) { |
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return (x != null) ? altThrowable(x) : (v == null) ? NIL : v; |
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1.20 |
} |
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1.1 |
/** |
212 |
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1.104 |
* Decodes outcome to return result or throw unchecked exception |
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1.1 |
*/ |
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1.104 |
private static <T> T reportJoin(Object r) { |
215 |
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if (r instanceof AltResult) { |
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Throwable x; |
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if ((x = ((AltResult)r).ex) == null) |
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return null; |
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if (x instanceof CancellationException) |
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throw (CancellationException)x; |
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if (x instanceof CompletionException) |
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throw (CompletionException)x; |
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throw new CompletionException(x); |
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1.28 |
} |
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1.104 |
@SuppressWarnings("unchecked") T tr = (T) r; |
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return tr; |
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1.1 |
} |
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/** |
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1.104 |
* Reports result using Future.get conventions |
231 |
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1.1 |
*/ |
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1.104 |
private static <T> T reportGet(Object r) |
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throws InterruptedException, ExecutionException { |
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if (r == null) // by convention below, null means interrupted |
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throw new InterruptedException(); |
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if (r instanceof AltResult) { |
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Throwable x, cause; |
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if ((x = ((AltResult)r).ex) == null) |
239 |
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1.28 |
return null; |
240 |
dl |
1.104 |
if (x instanceof CancellationException) |
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throw (CancellationException)x; |
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if ((x instanceof CompletionException) && |
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(cause = x.getCause()) != null) |
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x = cause; |
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throw new ExecutionException(x); |
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dl |
1.28 |
} |
247 |
dl |
1.104 |
@SuppressWarnings("unchecked") T tr = (T) r; |
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return tr; |
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dl |
1.1 |
} |
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251 |
dl |
1.104 |
/* ------------- Async Tasks -------------- */ |
252 |
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dl |
1.1 |
/** |
254 |
dl |
1.104 |
* Default executor -- ForkJoinPool.commonPool() unless it cannot |
255 |
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* support parallelism. |
256 |
dl |
1.1 |
*/ |
257 |
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1.104 |
static final Executor asyncPool = |
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(ForkJoinPool.getCommonPoolParallelism() > 1) ? |
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ForkJoinPool.commonPool() : new ThreadPerTaskExecutor(); |
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1.1 |
|
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1.104 |
/** Fallback if ForkJoinPool.commonPool() cannot support parallelism */ |
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static final class ThreadPerTaskExecutor implements Executor { |
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public void execute(Runnable r) { new Thread(r).start(); } |
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dl |
1.1 |
} |
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266 |
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/** |
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jsr166 |
1.56 |
* A marker interface identifying asynchronous tasks produced by |
268 |
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1.28 |
* {@code async} methods. This may be useful for monitoring, |
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* debugging, and tracking asynchronous activities. |
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jsr166 |
1.57 |
* |
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* @since 1.8 |
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1.1 |
*/ |
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1.28 |
public static interface AsynchronousCompletionTask { |
274 |
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1.1 |
} |
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dl |
1.104 |
/** |
277 |
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* Base class for tasks that can act as either FJ or plain |
278 |
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* Runnables. Abstract method compute calls an associated "now" |
279 |
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* method. Method exec calls compute if its CompletableFuture is |
280 |
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* not already done, and runs completions if done. Fields are not |
281 |
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* in general final and can be nulled out after use (but most |
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* currently are not). Classes include serialVersionUIDs even |
283 |
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* though they are currently never serialized. |
284 |
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*/ |
285 |
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abstract static class Async<T> extends ForkJoinTask<Void> |
286 |
dl |
1.28 |
implements Runnable, AsynchronousCompletionTask { |
287 |
dl |
1.104 |
CompletableFuture<T> dep; // the CompletableFuture to trigger |
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Async(CompletableFuture<T> dep) { this.dep = dep; } |
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jsr166 |
1.105 |
abstract void compute(); // call the associated "now" method |
291 |
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1.104 |
|
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jsr166 |
1.105 |
public final boolean exec() { |
293 |
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1.104 |
CompletableFuture<T> d; |
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if ((d = dep) != null) { |
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if (d.result == null) // suppress if cancelled |
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compute(); |
297 |
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if (d.result != null) |
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d.postComplete(); |
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dep = null; // detach |
300 |
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} |
301 |
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return true; |
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} |
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dl |
1.28 |
public final Void getRawResult() { return null; } |
304 |
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public final void setRawResult(Void v) { } |
305 |
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public final void run() { exec(); } |
306 |
dl |
1.104 |
private static final long serialVersionUID = 5232453952276885070L; |
307 |
jsr166 |
1.26 |
} |
308 |
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|
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dl |
1.104 |
/* ------------- Completions -------------- */ |
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|
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jsr166 |
1.106 |
abstract static class Completion<T> { // See above |
312 |
dl |
1.104 |
volatile Completion<?> next; // Treiber stack link |
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/** |
315 |
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* Performs completion action if enabled, returning a |
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jsr166 |
1.107 |
* completed dependent CompletableFuture, if one exists. |
317 |
dl |
1.104 |
*/ |
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abstract CompletableFuture<?> tryAct(); |
319 |
dl |
1.96 |
} |
320 |
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321 |
dl |
1.104 |
/** |
322 |
jsr166 |
1.107 |
* Triggers all reachable enabled dependents. Call only when |
323 |
dl |
1.104 |
* known to be done. |
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*/ |
325 |
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final void postComplete() { |
326 |
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/* |
327 |
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* On each step, variable f holds current completions to pop |
328 |
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* and run. It is extended along only one path at a time, |
329 |
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* pushing others to avoid StackOverflowErrors on recursion. |
330 |
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*/ |
331 |
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CompletableFuture<?> f = this; Completion<?> h; |
332 |
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while ((h = f.completions) != null || |
333 |
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(f != this && (h = (f = this).completions) != null)) { |
334 |
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CompletableFuture<?> d; Completion<?> t; |
335 |
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if (f.casCompletions(h, t = h.next)) { |
336 |
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if (t != null) { |
337 |
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if (f != this) { // push |
338 |
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do {} while (!casCompletions(h.next = completions, h)); |
339 |
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continue; |
340 |
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} |
341 |
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h.next = null; // detach |
342 |
dl |
1.28 |
} |
343 |
dl |
1.104 |
f = (d = h.tryAct()) == null ? this : d; |
344 |
dl |
1.19 |
} |
345 |
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} |
346 |
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} |
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348 |
dl |
1.104 |
/* ------------- One-source Completions -------------- */ |
349 |
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350 |
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/** |
351 |
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* A Completion with a source and dependent. The "dep" field acts |
352 |
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* as a claim, nulled out to disable further attempts to |
353 |
|
|
* trigger. Fields can only be observed by other threads upon |
354 |
|
|
* successful push; and should be nulled out after claim. |
355 |
|
|
*/ |
356 |
jsr166 |
1.106 |
abstract static class UniCompletion<T> extends Completion<T> { |
357 |
dl |
1.104 |
Executor async; // executor to use (null if none) |
358 |
|
|
CompletableFuture<T> dep; // the dependent to complete |
359 |
|
|
CompletableFuture<?> src; // source of value for tryAct |
360 |
|
|
|
361 |
|
|
UniCompletion(Executor async, CompletableFuture<T> dep, |
362 |
|
|
CompletableFuture<?> src) { |
363 |
|
|
this.async = async; this.dep = dep; this.src = src; |
364 |
|
|
} |
365 |
|
|
|
366 |
|
|
/** Tries to claim completion action by CASing dep to null */ |
367 |
|
|
final boolean claim(CompletableFuture<T> d) { |
368 |
|
|
return UNSAFE.compareAndSwapObject(this, DEP, d, null); |
369 |
|
|
} |
370 |
|
|
|
371 |
|
|
private static final sun.misc.Unsafe UNSAFE; |
372 |
|
|
private static final long DEP; |
373 |
|
|
static { |
374 |
|
|
try { |
375 |
|
|
UNSAFE = sun.misc.Unsafe.getUnsafe(); |
376 |
|
|
Class<?> k = UniCompletion.class; |
377 |
|
|
DEP = UNSAFE.objectFieldOffset |
378 |
|
|
(k.getDeclaredField("dep")); |
379 |
|
|
} catch (Exception x) { |
380 |
|
|
throw new Error(x); |
381 |
dl |
1.1 |
} |
382 |
|
|
} |
383 |
|
|
} |
384 |
|
|
|
385 |
dl |
1.104 |
/** Pushes c on to completions, and triggers c if done. */ |
386 |
|
|
private void unipush(UniCompletion<?> c) { |
387 |
|
|
if (c != null) { |
388 |
|
|
CompletableFuture<?> d; |
389 |
|
|
while (result == null && !casCompletions(c.next = completions, c)) |
390 |
|
|
c.next = null; // clear on CAS failure |
391 |
|
|
if ((d = c.tryAct()) != null) // cover races |
392 |
|
|
d.postComplete(); |
393 |
|
|
if (result != null) // clean stack |
394 |
|
|
postComplete(); |
395 |
|
|
} |
396 |
|
|
} |
397 |
|
|
|
398 |
|
|
// Immediate, async, delayed, and routing support for Function/apply |
399 |
|
|
|
400 |
|
|
static <T,U> void nowApply(Executor e, CompletableFuture<U> d, Object r, |
401 |
|
|
Function<? super T,? extends U> f) { |
402 |
|
|
if (d != null && f != null) { |
403 |
|
|
T t; U u; Throwable x; |
404 |
|
|
if (r instanceof AltResult) { |
405 |
|
|
t = null; |
406 |
|
|
x = ((AltResult)r).ex; |
407 |
|
|
} |
408 |
|
|
else { |
409 |
|
|
@SuppressWarnings("unchecked") T tr = (T) r; t = tr; |
410 |
|
|
x = null; |
411 |
|
|
} |
412 |
|
|
if (x == null) { |
413 |
dl |
1.21 |
try { |
414 |
dl |
1.104 |
if (e != null) { |
415 |
|
|
e.execute(new AsyncApply<T,U>(d, t, f)); |
416 |
|
|
return; |
417 |
|
|
} |
418 |
|
|
u = f.apply(t); |
419 |
|
|
} catch (Throwable ex) { |
420 |
|
|
x = ex; |
421 |
dl |
1.21 |
u = null; |
422 |
|
|
} |
423 |
dl |
1.1 |
} |
424 |
dl |
1.104 |
else |
425 |
|
|
u = null; |
426 |
|
|
d.internalComplete(encodeOutcome(u, x)); |
427 |
dl |
1.1 |
} |
428 |
|
|
} |
429 |
|
|
|
430 |
dl |
1.104 |
static final class AsyncApply<T,U> extends Async<U> { |
431 |
jsr166 |
1.105 |
T arg; Function<? super T,? extends U> fn; |
432 |
dl |
1.104 |
AsyncApply(CompletableFuture<U> dep, T arg, |
433 |
|
|
Function<? super T,? extends U> fn) { |
434 |
|
|
super(dep); this.arg = arg; this.fn = fn; |
435 |
dl |
1.1 |
} |
436 |
jsr166 |
1.105 |
final void compute() { nowApply(null, dep, arg, fn); } |
437 |
dl |
1.1 |
private static final long serialVersionUID = 5232453952276885070L; |
438 |
|
|
} |
439 |
|
|
|
440 |
dl |
1.104 |
static final class DelayedApply<T,U> extends UniCompletion<U> { |
441 |
|
|
Function<? super T,? extends U> fn; |
442 |
|
|
DelayedApply(Executor async, CompletableFuture<U> dep, |
443 |
|
|
CompletableFuture<?> src, |
444 |
|
|
Function<? super T,? extends U> fn) { |
445 |
|
|
super(async, dep, src); this.fn = fn; |
446 |
|
|
} |
447 |
|
|
final CompletableFuture<?> tryAct() { |
448 |
|
|
CompletableFuture<U> d; CompletableFuture<?> a; Object r; |
449 |
|
|
if ((d = dep) != null && (a = src) != null && |
450 |
|
|
(r = a.result) != null && claim(d)) { |
451 |
|
|
nowApply(async, d, r, fn); |
452 |
|
|
src = null; fn = null; |
453 |
|
|
if (d.result != null) return d; |
454 |
dl |
1.7 |
} |
455 |
dl |
1.104 |
return null; |
456 |
dl |
1.7 |
} |
457 |
|
|
} |
458 |
|
|
|
459 |
dl |
1.104 |
private <U> CompletableFuture<U> doThenApply( |
460 |
|
|
Function<? super T,? extends U> fn, Executor e) { |
461 |
|
|
if (fn == null) throw new NullPointerException(); |
462 |
|
|
CompletableFuture<U> d = new CompletableFuture<U>(); |
463 |
|
|
Object r = result; |
464 |
|
|
if (r == null) |
465 |
|
|
unipush(new DelayedApply<T,U>(e, d, this, fn)); |
466 |
|
|
else |
467 |
|
|
nowApply(e, d, r, fn); |
468 |
|
|
return d; |
469 |
|
|
} |
470 |
|
|
|
471 |
|
|
// Consumer/accept |
472 |
|
|
|
473 |
|
|
static <T,U> void nowAccept(Executor e, CompletableFuture<U> d, |
474 |
|
|
Object r, Consumer<? super T> f) { |
475 |
|
|
if (d != null && f != null) { |
476 |
|
|
T t; Throwable x; |
477 |
|
|
if (r instanceof AltResult) { |
478 |
|
|
t = null; |
479 |
|
|
x = ((AltResult)r).ex; |
480 |
|
|
} |
481 |
|
|
else { |
482 |
|
|
@SuppressWarnings("unchecked") T tr = (T) r; t = tr; |
483 |
|
|
x = null; |
484 |
|
|
} |
485 |
|
|
if (x == null) { |
486 |
dl |
1.21 |
try { |
487 |
dl |
1.104 |
if (e != null) { |
488 |
|
|
e.execute(new AsyncAccept<T,U>(d, t, f)); |
489 |
|
|
return; |
490 |
|
|
} |
491 |
|
|
f.accept(t); |
492 |
|
|
} catch (Throwable ex) { |
493 |
|
|
x = ex; |
494 |
dl |
1.21 |
} |
495 |
dl |
1.7 |
} |
496 |
dl |
1.104 |
d.internalComplete(encodeOutcome(null, x)); |
497 |
dl |
1.7 |
} |
498 |
|
|
} |
499 |
|
|
|
500 |
dl |
1.104 |
static final class AsyncAccept<T,U> extends Async<U> { |
501 |
jsr166 |
1.105 |
T arg; Consumer<? super T> fn; |
502 |
dl |
1.104 |
AsyncAccept(CompletableFuture<U> dep, T arg, |
503 |
|
|
Consumer<? super T> fn) { |
504 |
|
|
super(dep); this.arg = arg; this.fn = fn; |
505 |
dl |
1.37 |
} |
506 |
jsr166 |
1.105 |
final void compute() { nowAccept(null, dep, arg, fn); } |
507 |
dl |
1.37 |
private static final long serialVersionUID = 5232453952276885070L; |
508 |
|
|
} |
509 |
|
|
|
510 |
dl |
1.104 |
static final class DelayedAccept<T> extends UniCompletion<Void> { |
511 |
|
|
Consumer<? super T> fn; |
512 |
|
|
DelayedAccept(Executor async, CompletableFuture<Void> dep, |
513 |
|
|
CompletableFuture<?> src, Consumer<? super T> fn) { |
514 |
|
|
super(async, dep, src); this.fn = fn; |
515 |
dl |
1.91 |
} |
516 |
dl |
1.104 |
final CompletableFuture<?> tryAct() { |
517 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a; Object r; |
518 |
|
|
if ((d = dep) != null && (a = src) != null && |
519 |
|
|
(r = a.result) != null && claim(d)) { |
520 |
|
|
nowAccept(async, d, r, fn); |
521 |
|
|
src = null; fn = null; |
522 |
|
|
if (d.result != null) return d; |
523 |
dl |
1.91 |
} |
524 |
dl |
1.104 |
return null; |
525 |
dl |
1.91 |
} |
526 |
|
|
} |
527 |
|
|
|
528 |
dl |
1.104 |
private CompletableFuture<Void> doThenAccept(Consumer<? super T> fn, |
529 |
|
|
Executor e) { |
530 |
|
|
if (fn == null) throw new NullPointerException(); |
531 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
532 |
|
|
Object r = result; |
533 |
|
|
if (r == null) |
534 |
|
|
unipush(new DelayedAccept<T>(e, d, this, fn)); |
535 |
|
|
else |
536 |
|
|
nowAccept(e, d, r, fn); |
537 |
|
|
return d; |
538 |
dl |
1.28 |
} |
539 |
|
|
|
540 |
dl |
1.104 |
// Runnable/run |
541 |
dl |
1.1 |
|
542 |
dl |
1.104 |
static <T> void nowRun(Executor e, CompletableFuture<T> d, Object r, |
543 |
|
|
Runnable f) { |
544 |
|
|
if (d != null && f != null) { |
545 |
|
|
Throwable x = (r instanceof AltResult) ? ((AltResult)r).ex : null; |
546 |
|
|
if (x == null) { |
547 |
|
|
try { |
548 |
|
|
if (e != null) { |
549 |
|
|
e.execute(new AsyncRun<T>(d, f)); |
550 |
|
|
return; |
551 |
dl |
1.17 |
} |
552 |
dl |
1.104 |
f.run(); |
553 |
|
|
} catch (Throwable ex) { |
554 |
|
|
x = ex; |
555 |
dl |
1.17 |
} |
556 |
dl |
1.1 |
} |
557 |
dl |
1.104 |
d.internalComplete(encodeOutcome(null, x)); |
558 |
dl |
1.1 |
} |
559 |
|
|
} |
560 |
|
|
|
561 |
dl |
1.104 |
static final class AsyncRun<T> extends Async<T> { |
562 |
jsr166 |
1.105 |
Runnable fn; |
563 |
dl |
1.104 |
AsyncRun(CompletableFuture<T> dep, Runnable fn) { |
564 |
|
|
super(dep); this.fn = fn; |
565 |
dl |
1.7 |
} |
566 |
jsr166 |
1.105 |
final void compute() { nowRun(null, dep, null, fn); } |
567 |
dl |
1.20 |
private static final long serialVersionUID = 5232453952276885070L; |
568 |
dl |
1.7 |
} |
569 |
|
|
|
570 |
dl |
1.104 |
static final class DelayedRun extends UniCompletion<Void> { |
571 |
jsr166 |
1.105 |
Runnable fn; |
572 |
dl |
1.104 |
DelayedRun(Executor async, CompletableFuture<Void> dep, |
573 |
|
|
CompletableFuture<?> src, Runnable fn) { |
574 |
|
|
super(async, dep, src); this.fn = fn; |
575 |
|
|
} |
576 |
|
|
final CompletableFuture<?> tryAct() { |
577 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a; Object r; |
578 |
|
|
if ((d = dep) != null && (a = src) != null && |
579 |
|
|
(r = a.result) != null && claim(d)) { |
580 |
|
|
nowRun(async, d, r, fn); |
581 |
|
|
src = null; fn = null; // clear refs |
582 |
|
|
if (d.result != null) return d; |
583 |
dl |
1.1 |
} |
584 |
dl |
1.104 |
return null; |
585 |
dl |
1.1 |
} |
586 |
|
|
} |
587 |
|
|
|
588 |
dl |
1.104 |
private CompletableFuture<Void> doThenRun(Runnable fn, Executor e) { |
589 |
|
|
if (fn == null) throw new NullPointerException(); |
590 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
591 |
|
|
Object r = result; |
592 |
|
|
if (r == null) |
593 |
|
|
unipush(new DelayedRun(e, d, this, fn)); |
594 |
|
|
else |
595 |
|
|
nowRun(e, d, r, fn); |
596 |
|
|
return d; |
597 |
|
|
} |
598 |
|
|
|
599 |
|
|
// Supplier/get |
600 |
|
|
|
601 |
|
|
static <T> void nowSupply(CompletableFuture<T> d, Supplier<T> f) { |
602 |
|
|
if (d != null && f != null) { |
603 |
|
|
T t; Throwable x; |
604 |
|
|
try { |
605 |
|
|
t = f.get(); |
606 |
|
|
x = null; |
607 |
|
|
} catch (Throwable ex) { |
608 |
|
|
x = ex; |
609 |
|
|
t = null; |
610 |
jsr166 |
1.2 |
} |
611 |
dl |
1.104 |
d.internalComplete(encodeOutcome(t, x)); |
612 |
jsr166 |
1.2 |
} |
613 |
dl |
1.1 |
} |
614 |
|
|
|
615 |
dl |
1.104 |
static final class AsyncSupply<T> extends Async<T> { |
616 |
jsr166 |
1.105 |
Supplier<T> fn; |
617 |
dl |
1.104 |
AsyncSupply(CompletableFuture<T> dep, Supplier<T> fn) { |
618 |
|
|
super(dep); this.fn = fn; |
619 |
dl |
1.7 |
} |
620 |
jsr166 |
1.105 |
final void compute() { nowSupply(dep, fn); } |
621 |
dl |
1.20 |
private static final long serialVersionUID = 5232453952276885070L; |
622 |
dl |
1.7 |
} |
623 |
|
|
|
624 |
dl |
1.104 |
// WhenComplete |
625 |
|
|
|
626 |
|
|
static <T> void nowWhen(Executor e, CompletableFuture<T> d, Object r, |
627 |
|
|
BiConsumer<? super T,? super Throwable> f) { |
628 |
|
|
if (d != null && f != null) { |
629 |
|
|
T t; Throwable x, dx; |
630 |
|
|
if (r instanceof AltResult) { |
631 |
|
|
t = null; |
632 |
|
|
x = ((AltResult)r).ex; |
633 |
|
|
} |
634 |
|
|
else { |
635 |
|
|
@SuppressWarnings("unchecked") T tr = (T) r; t = tr; |
636 |
|
|
x = null; |
637 |
|
|
} |
638 |
|
|
try { |
639 |
|
|
if (e != null) { |
640 |
|
|
e.execute(new AsyncWhen<T>(d, r, f)); |
641 |
|
|
return; |
642 |
jsr166 |
1.2 |
} |
643 |
dl |
1.104 |
f.accept(t, x); |
644 |
|
|
dx = null; |
645 |
|
|
} catch (Throwable ex) { |
646 |
|
|
dx = ex; |
647 |
jsr166 |
1.2 |
} |
648 |
dl |
1.104 |
d.internalComplete(encodeOutcome(t, x != null ? x : dx)); |
649 |
jsr166 |
1.2 |
} |
650 |
dl |
1.1 |
} |
651 |
|
|
|
652 |
dl |
1.104 |
static final class AsyncWhen<T> extends Async<T> { |
653 |
jsr166 |
1.105 |
Object arg; BiConsumer<? super T,? super Throwable> fn; |
654 |
dl |
1.104 |
AsyncWhen(CompletableFuture<T> dep, Object arg, |
655 |
|
|
BiConsumer<? super T,? super Throwable> fn) { |
656 |
|
|
super(dep); this.arg = arg; this.fn = fn; |
657 |
dl |
1.35 |
} |
658 |
jsr166 |
1.105 |
final void compute() { nowWhen(null, dep, arg, fn); } |
659 |
dl |
1.35 |
private static final long serialVersionUID = 5232453952276885070L; |
660 |
|
|
} |
661 |
|
|
|
662 |
dl |
1.104 |
static final class DelayedWhen<T> extends UniCompletion<T> { |
663 |
|
|
BiConsumer<? super T, ? super Throwable> fn; |
664 |
|
|
DelayedWhen(Executor async, CompletableFuture<T> dep, |
665 |
|
|
CompletableFuture<?> src, |
666 |
|
|
BiConsumer<? super T, ? super Throwable> fn) { |
667 |
|
|
super(async, dep, src); this.fn = fn; |
668 |
|
|
} |
669 |
|
|
final CompletableFuture<?> tryAct() { |
670 |
|
|
CompletableFuture<T> d; CompletableFuture<?> a; Object r; |
671 |
|
|
if ((d = dep) != null && (a = src) != null && |
672 |
|
|
(r = a.result) != null && claim(d)) { |
673 |
|
|
nowWhen(async, d, r, fn); |
674 |
|
|
src = null; fn = null; |
675 |
|
|
if (d.result != null) return d; |
676 |
jsr166 |
1.2 |
} |
677 |
dl |
1.104 |
return null; |
678 |
jsr166 |
1.2 |
} |
679 |
dl |
1.1 |
} |
680 |
|
|
|
681 |
dl |
1.104 |
private CompletableFuture<T> doWhenComplete( |
682 |
|
|
BiConsumer<? super T, ? super Throwable> fn, Executor e) { |
683 |
|
|
if (fn == null) throw new NullPointerException(); |
684 |
|
|
CompletableFuture<T> d = new CompletableFuture<T>(); |
685 |
|
|
Object r = result; |
686 |
|
|
if (r == null) |
687 |
|
|
unipush(new DelayedWhen<T>(e, d, this, fn)); |
688 |
|
|
else |
689 |
|
|
nowWhen(e, d, r, fn); |
690 |
|
|
return d; |
691 |
dl |
1.7 |
} |
692 |
|
|
|
693 |
dl |
1.104 |
// Handle |
694 |
|
|
|
695 |
|
|
static <T,U> void nowHandle(Executor e, CompletableFuture<U> d, Object r, |
696 |
|
|
BiFunction<? super T, Throwable, ? extends U> f) { |
697 |
|
|
if (d != null && f != null) { |
698 |
|
|
T t; U u; Throwable x, dx; |
699 |
|
|
if (r instanceof AltResult) { |
700 |
|
|
t = null; |
701 |
|
|
x = ((AltResult)r).ex; |
702 |
|
|
} |
703 |
|
|
else { |
704 |
|
|
@SuppressWarnings("unchecked") T tr = (T) r; t = tr; |
705 |
|
|
x = null; |
706 |
|
|
} |
707 |
|
|
try { |
708 |
|
|
if (e != null) { |
709 |
|
|
e.execute(new AsyncCombine<T,Throwable,U>(d, t, x, f)); |
710 |
|
|
return; |
711 |
dl |
1.1 |
} |
712 |
dl |
1.104 |
u = f.apply(t, x); |
713 |
|
|
dx = null; |
714 |
|
|
} catch (Throwable ex) { |
715 |
|
|
dx = ex; |
716 |
|
|
u = null; |
717 |
jsr166 |
1.2 |
} |
718 |
dl |
1.104 |
d.internalComplete(encodeOutcome(u, dx)); |
719 |
jsr166 |
1.2 |
} |
720 |
dl |
1.1 |
} |
721 |
|
|
|
722 |
dl |
1.104 |
static final class DelayedHandle<T,U> extends UniCompletion<U> { |
723 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn; |
724 |
|
|
DelayedHandle(Executor async, CompletableFuture<U> dep, |
725 |
|
|
CompletableFuture<?> src, |
726 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn) { |
727 |
|
|
super(async, dep, src); this.fn = fn; |
728 |
|
|
} |
729 |
|
|
final CompletableFuture<?> tryAct() { |
730 |
|
|
CompletableFuture<U> d; CompletableFuture<?> a; Object r; |
731 |
|
|
if ((d = dep) != null && (a = src) != null && |
732 |
|
|
(r = a.result) != null && claim(d)) { |
733 |
|
|
nowHandle(async, d, r, fn); |
734 |
|
|
src = null; fn = null; |
735 |
|
|
if (d.result != null) return d; |
736 |
dl |
1.35 |
} |
737 |
dl |
1.104 |
return null; |
738 |
dl |
1.35 |
} |
739 |
|
|
} |
740 |
|
|
|
741 |
dl |
1.104 |
private <U> CompletableFuture<U> doHandle( |
742 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn, |
743 |
|
|
Executor e) { |
744 |
|
|
if (fn == null) throw new NullPointerException(); |
745 |
|
|
CompletableFuture<U> d = new CompletableFuture<U>(); |
746 |
|
|
Object r = result; |
747 |
|
|
if (r == null) |
748 |
|
|
unipush(new DelayedHandle<T,U>(e, d, this, fn)); |
749 |
|
|
else |
750 |
|
|
nowHandle(e, d, r, fn); |
751 |
|
|
return d; |
752 |
dl |
1.1 |
} |
753 |
|
|
|
754 |
dl |
1.104 |
// Exceptionally |
755 |
|
|
|
756 |
|
|
static <T> void nowExceptionally(CompletableFuture<T> d, Object r, |
757 |
|
|
Function<? super Throwable, ? extends T> f) { |
758 |
|
|
if (d != null && f != null) { |
759 |
|
|
T t; Throwable x, dx; |
760 |
|
|
if ((r instanceof AltResult) && (x = ((AltResult)r).ex) != null) { |
761 |
|
|
try { |
762 |
|
|
t = f.apply(x); |
763 |
|
|
dx = null; |
764 |
|
|
} catch (Throwable ex) { |
765 |
|
|
dx = ex; |
766 |
dl |
1.88 |
t = null; |
767 |
|
|
} |
768 |
|
|
} |
769 |
dl |
1.104 |
else { |
770 |
|
|
@SuppressWarnings("unchecked") T tr = (T) r; t = tr; |
771 |
|
|
dx = null; |
772 |
|
|
} |
773 |
|
|
d.internalComplete(encodeOutcome(t, dx)); |
774 |
dl |
1.88 |
} |
775 |
|
|
} |
776 |
|
|
|
777 |
dl |
1.104 |
static final class DelayedExceptionally<T> extends UniCompletion<T> { |
778 |
|
|
Function<? super Throwable, ? extends T> fn; |
779 |
|
|
DelayedExceptionally(CompletableFuture<T> dep, CompletableFuture<?> src, |
780 |
|
|
Function<? super Throwable, ? extends T> fn) { |
781 |
|
|
super(null, dep, src); this.fn = fn; |
782 |
|
|
} |
783 |
|
|
final CompletableFuture<?> tryAct() { |
784 |
|
|
CompletableFuture<T> d; CompletableFuture<?> a; Object r; |
785 |
|
|
if ((d = dep) != null && (a = src) != null && |
786 |
|
|
(r = a.result) != null && claim(d)) { |
787 |
|
|
nowExceptionally(d, r, fn); |
788 |
|
|
src = null; fn = null; |
789 |
|
|
if (d.result != null) return d; |
790 |
dl |
1.17 |
} |
791 |
dl |
1.104 |
return null; |
792 |
dl |
1.17 |
} |
793 |
|
|
} |
794 |
|
|
|
795 |
dl |
1.104 |
private CompletableFuture<T> doExceptionally( |
796 |
|
|
Function<Throwable, ? extends T> fn) { |
797 |
|
|
if (fn == null) throw new NullPointerException(); |
798 |
|
|
CompletableFuture<T> d = new CompletableFuture<T>(); |
799 |
|
|
Object r = result; |
800 |
|
|
if (r == null) |
801 |
|
|
unipush(new DelayedExceptionally<T>(d, this, fn)); |
802 |
|
|
else |
803 |
|
|
nowExceptionally(d, r, fn); |
804 |
|
|
return d; |
805 |
dl |
1.75 |
} |
806 |
|
|
|
807 |
dl |
1.104 |
// Identity function used by nowCompose and anyOf |
808 |
|
|
|
809 |
|
|
static <T> void nowCopy(CompletableFuture<T> d, Object r) { |
810 |
|
|
if (d != null && d.result == null) { |
811 |
|
|
Throwable x; |
812 |
|
|
d.internalComplete(((r instanceof AltResult) && |
813 |
|
|
(x = ((AltResult)r).ex) != null && |
814 |
|
|
!(x instanceof CompletionException)) ? |
815 |
|
|
new AltResult(new CompletionException(x)): r); |
816 |
dl |
1.17 |
} |
817 |
|
|
} |
818 |
|
|
|
819 |
dl |
1.104 |
static final class DelayedCopy<T> extends UniCompletion<T> { |
820 |
|
|
DelayedCopy(CompletableFuture<T> dep, CompletableFuture<?> src) { |
821 |
|
|
super(null, dep, src); |
822 |
|
|
} |
823 |
|
|
final CompletableFuture<?> tryAct() { |
824 |
|
|
CompletableFuture<T> d; CompletableFuture<?> a; Object r; |
825 |
|
|
if ((d = dep) != null && (a = src) != null && |
826 |
|
|
(r = a.result) != null && claim(d)) { |
827 |
|
|
nowCopy(d, r); |
828 |
|
|
src = null; |
829 |
|
|
if (d.result != null) return d; |
830 |
dl |
1.28 |
} |
831 |
dl |
1.104 |
return null; |
832 |
dl |
1.28 |
} |
833 |
|
|
} |
834 |
|
|
|
835 |
dl |
1.104 |
// Compose |
836 |
dl |
1.28 |
|
837 |
dl |
1.104 |
static <T,U> void nowCompose(Executor e, CompletableFuture<U> d, Object r, |
838 |
|
|
Function<? super T, ? extends CompletionStage<U>> f) { |
839 |
|
|
if (d != null && f != null) { |
840 |
|
|
T t; Throwable x; |
841 |
dl |
1.88 |
if (r instanceof AltResult) { |
842 |
|
|
t = null; |
843 |
dl |
1.104 |
x = ((AltResult)r).ex; |
844 |
dl |
1.88 |
} |
845 |
|
|
else { |
846 |
dl |
1.104 |
@SuppressWarnings("unchecked") T tr = (T) r; t = tr; |
847 |
|
|
x = null; |
848 |
dl |
1.88 |
} |
849 |
dl |
1.104 |
if (x == null) { |
850 |
dl |
1.88 |
try { |
851 |
|
|
if (e != null) |
852 |
dl |
1.104 |
e.execute(new AsyncCompose<T,U>(d, t, f)); |
853 |
|
|
else { |
854 |
|
|
CompletableFuture<U> c = |
855 |
|
|
f.apply(t).toCompletableFuture(); |
856 |
|
|
Object s = c.result; |
857 |
|
|
if (s == null) |
858 |
|
|
c.unipush(new DelayedCopy<U>(d, c)); |
859 |
|
|
else |
860 |
|
|
nowCopy(d, s); |
861 |
|
|
} |
862 |
|
|
return; |
863 |
|
|
} catch (Throwable ex) { |
864 |
|
|
x = ex; |
865 |
dl |
1.88 |
} |
866 |
|
|
} |
867 |
dl |
1.104 |
d.internalComplete(encodeOutcome(null, x)); |
868 |
dl |
1.88 |
} |
869 |
dl |
1.28 |
} |
870 |
|
|
|
871 |
dl |
1.104 |
static final class AsyncCompose<T,U> extends Async<U> { |
872 |
jsr166 |
1.105 |
T arg; Function<? super T, ? extends CompletionStage<U>> fn; |
873 |
dl |
1.104 |
AsyncCompose(CompletableFuture<U> dep, T arg, |
874 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn) { |
875 |
|
|
super(dep); this.arg = arg; this.fn = fn; |
876 |
|
|
} |
877 |
jsr166 |
1.105 |
final void compute() { nowCompose(null, dep, arg, fn); } |
878 |
dl |
1.104 |
private static final long serialVersionUID = 5232453952276885070L; |
879 |
|
|
} |
880 |
|
|
|
881 |
|
|
static final class DelayedCompose<T,U> extends UniCompletion<U> { |
882 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn; |
883 |
|
|
DelayedCompose(Executor async, CompletableFuture<U> dep, |
884 |
|
|
CompletableFuture<?> src, |
885 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn) { |
886 |
|
|
super(async, dep, src); this.fn = fn; |
887 |
|
|
} |
888 |
|
|
final CompletableFuture<?> tryAct() { |
889 |
|
|
CompletableFuture<U> d; CompletableFuture<?> a; Object r; |
890 |
|
|
if ((d = dep) != null && (a = src) != null && |
891 |
|
|
(r = a.result) != null && claim(d)) { |
892 |
|
|
nowCompose(async, d, r, fn); |
893 |
|
|
src = null; fn = null; |
894 |
|
|
if (d.result != null) return d; |
895 |
|
|
} |
896 |
|
|
return null; |
897 |
|
|
} |
898 |
|
|
} |
899 |
|
|
|
900 |
|
|
private <U> CompletableFuture<U> doThenCompose( |
901 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn, Executor e) { |
902 |
dl |
1.88 |
if (fn == null) throw new NullPointerException(); |
903 |
dl |
1.104 |
Object r = result; |
904 |
|
|
if (r == null || e != null) { |
905 |
|
|
CompletableFuture<U> d = new CompletableFuture<U>(); |
906 |
|
|
if (r == null) |
907 |
|
|
unipush(new DelayedCompose<T,U>(e, d, this, fn)); |
908 |
|
|
else |
909 |
|
|
nowCompose(e, d, r, fn); |
910 |
|
|
return d; |
911 |
dl |
1.88 |
} |
912 |
dl |
1.104 |
else { // try to return function result |
913 |
|
|
T t; Throwable x; |
914 |
dl |
1.88 |
if (r instanceof AltResult) { |
915 |
|
|
t = null; |
916 |
dl |
1.104 |
x = ((AltResult)r).ex; |
917 |
dl |
1.88 |
} |
918 |
|
|
else { |
919 |
dl |
1.104 |
@SuppressWarnings("unchecked") T tr = (T) r; t = tr; |
920 |
|
|
x = null; |
921 |
dl |
1.88 |
} |
922 |
dl |
1.104 |
if (x == null) { |
923 |
dl |
1.88 |
try { |
924 |
dl |
1.104 |
return fn.apply(t).toCompletableFuture(); |
925 |
|
|
} catch (Throwable ex) { |
926 |
|
|
x = ex; |
927 |
dl |
1.88 |
} |
928 |
|
|
} |
929 |
dl |
1.104 |
CompletableFuture<U> d = new CompletableFuture<U>(); |
930 |
|
|
d.result = encodeOutcome(null, x); |
931 |
|
|
return d; |
932 |
dl |
1.88 |
} |
933 |
dl |
1.28 |
} |
934 |
|
|
|
935 |
dl |
1.104 |
/* ------------- Two-source Completions -------------- */ |
936 |
|
|
|
937 |
|
|
/** A Completion with two sources */ |
938 |
jsr166 |
1.106 |
abstract static class BiCompletion<T> extends UniCompletion<T> { |
939 |
dl |
1.104 |
CompletableFuture<?> snd; // second source for tryAct |
940 |
|
|
BiCompletion(Executor async, CompletableFuture<T> dep, |
941 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd) { |
942 |
|
|
super(async, dep, src); this.snd = snd; |
943 |
|
|
} |
944 |
|
|
} |
945 |
|
|
|
946 |
|
|
/** A Completion delegating to a shared BiCompletion */ |
947 |
|
|
static final class CoBiCompletion<T> extends Completion<T> { |
948 |
|
|
BiCompletion<T> completion; |
949 |
|
|
CoBiCompletion(BiCompletion<T> completion) { |
950 |
|
|
this.completion = completion; |
951 |
dl |
1.88 |
} |
952 |
dl |
1.104 |
final CompletableFuture<?> tryAct() { |
953 |
|
|
BiCompletion<T> c; |
954 |
|
|
return (c = completion) == null ? null : c.tryAct(); |
955 |
dl |
1.88 |
} |
956 |
|
|
} |
957 |
|
|
|
958 |
dl |
1.104 |
/* ------------- Two-source Anded -------------- */ |
959 |
|
|
|
960 |
|
|
/* Pushes c on to completions and o's completions unless both done. */ |
961 |
|
|
private <U> void bipushAnded(CompletableFuture<?> o, BiCompletion<U> c) { |
962 |
|
|
if (c != null && o != null) { |
963 |
|
|
Object r; CompletableFuture<?> d; |
964 |
|
|
while ((r = result) == null && |
965 |
|
|
!casCompletions(c.next = completions, c)) |
966 |
|
|
c.next = null; |
967 |
|
|
if (o.result == null) { |
968 |
|
|
Completion<U> q = (r != null) ? c : new CoBiCompletion<U>(c); |
969 |
|
|
while (o.result == null && |
970 |
|
|
!o.casCompletions(q.next = o.completions, q)) |
971 |
|
|
q.next = null; |
972 |
dl |
1.88 |
} |
973 |
dl |
1.104 |
if ((d = c.tryAct()) != null) |
974 |
|
|
d.postComplete(); |
975 |
|
|
if (o.result != null) |
976 |
|
|
o.postComplete(); |
977 |
|
|
if (result != null) |
978 |
|
|
postComplete(); |
979 |
dl |
1.88 |
} |
980 |
dl |
1.104 |
} |
981 |
|
|
|
982 |
|
|
// BiFunction/combine |
983 |
|
|
|
984 |
|
|
static <T,U,V> void nowCombine(Executor e, CompletableFuture<V> d, |
985 |
|
|
Object r, Object s, |
986 |
|
|
BiFunction<? super T,? super U,? extends V> f) { |
987 |
|
|
if (d != null && f != null) { |
988 |
|
|
T t; U u; V v; Throwable x; |
989 |
dl |
1.88 |
if (r instanceof AltResult) { |
990 |
|
|
t = null; |
991 |
dl |
1.104 |
x = ((AltResult)r).ex; |
992 |
dl |
1.88 |
} |
993 |
|
|
else { |
994 |
dl |
1.104 |
@SuppressWarnings("unchecked") T tr = (T) r; t = tr; |
995 |
|
|
x = null; |
996 |
dl |
1.88 |
} |
997 |
dl |
1.104 |
if (x != null) |
998 |
dl |
1.88 |
u = null; |
999 |
|
|
else if (s instanceof AltResult) { |
1000 |
dl |
1.104 |
x = ((AltResult)s).ex; |
1001 |
dl |
1.88 |
u = null; |
1002 |
|
|
} |
1003 |
|
|
else { |
1004 |
dl |
1.104 |
@SuppressWarnings("unchecked") U us = (U) s; u = us; |
1005 |
dl |
1.88 |
} |
1006 |
dl |
1.104 |
if (x == null) { |
1007 |
dl |
1.88 |
try { |
1008 |
dl |
1.104 |
if (e != null) { |
1009 |
|
|
e.execute(new AsyncCombine<T,U,V>(d, t, u, f)); |
1010 |
|
|
return; |
1011 |
|
|
} |
1012 |
|
|
v = f.apply(t, u); |
1013 |
|
|
} catch (Throwable ex) { |
1014 |
|
|
x = ex; |
1015 |
|
|
v = null; |
1016 |
dl |
1.88 |
} |
1017 |
|
|
} |
1018 |
dl |
1.104 |
else |
1019 |
|
|
v = null; |
1020 |
|
|
d.internalComplete(encodeOutcome(v, x)); |
1021 |
dl |
1.88 |
} |
1022 |
|
|
} |
1023 |
|
|
|
1024 |
dl |
1.104 |
static final class AsyncCombine<T,U,V> extends Async<V> { |
1025 |
jsr166 |
1.105 |
T arg1; U arg2; BiFunction<? super T,? super U,? extends V> fn; |
1026 |
dl |
1.104 |
AsyncCombine(CompletableFuture<V> dep, T arg1, U arg2, |
1027 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
1028 |
|
|
super(dep); this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; |
1029 |
|
|
} |
1030 |
jsr166 |
1.105 |
final void compute() { nowCombine(null, dep, arg1, arg2, fn); } |
1031 |
dl |
1.104 |
private static final long serialVersionUID = 5232453952276885070L; |
1032 |
|
|
} |
1033 |
|
|
|
1034 |
|
|
static final class DelayedCombine<T,U,V> extends BiCompletion<V> { |
1035 |
|
|
BiFunction<? super T,? super U,? extends V> fn; |
1036 |
|
|
DelayedCombine(Executor async, CompletableFuture<V> dep, |
1037 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, |
1038 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
1039 |
|
|
super(async, dep, src, snd); this.fn = fn; |
1040 |
|
|
} |
1041 |
|
|
final CompletableFuture<?> tryAct() { |
1042 |
|
|
CompletableFuture<V> d; CompletableFuture<?> a, b; Object r, s; |
1043 |
|
|
if ((d = dep) != null && (a = src) != null && (b = snd) != null && |
1044 |
|
|
(r = a.result) != null && (s = b.result) != null && claim(d)) { |
1045 |
|
|
nowCombine(async, d, r, s, fn); |
1046 |
|
|
src = null; snd = null; fn = null; |
1047 |
|
|
if (d.result != null) return d; |
1048 |
dl |
1.88 |
} |
1049 |
dl |
1.104 |
return null; |
1050 |
dl |
1.88 |
} |
1051 |
dl |
1.104 |
} |
1052 |
|
|
|
1053 |
|
|
private <U,V> CompletableFuture<V> doThenCombine( |
1054 |
|
|
CompletableFuture<? extends U> o, |
1055 |
|
|
BiFunction<? super T,? super U,? extends V> fn, |
1056 |
|
|
Executor e) { |
1057 |
|
|
if (o == null || fn == null) throw new NullPointerException(); |
1058 |
|
|
CompletableFuture<V> d = new CompletableFuture<V>(); |
1059 |
|
|
Object r = result, s = o.result; |
1060 |
|
|
if (r == null || s == null) |
1061 |
|
|
bipushAnded(o, new DelayedCombine<T,U,V>(e, d, this, o, fn)); |
1062 |
|
|
else |
1063 |
|
|
nowCombine(e, d, r, s, fn); |
1064 |
|
|
return d; |
1065 |
|
|
} |
1066 |
|
|
|
1067 |
|
|
// BiConsumer/AcceptBoth |
1068 |
|
|
|
1069 |
|
|
static <T,U,V> void nowAcceptBoth(Executor e, CompletableFuture<V> d, |
1070 |
|
|
Object r, Object s, |
1071 |
|
|
BiConsumer<? super T,? super U> f) { |
1072 |
|
|
if (d != null && f != null) { |
1073 |
|
|
T t; U u; Throwable x; |
1074 |
dl |
1.88 |
if (r instanceof AltResult) { |
1075 |
|
|
t = null; |
1076 |
dl |
1.104 |
x = ((AltResult)r).ex; |
1077 |
dl |
1.88 |
} |
1078 |
|
|
else { |
1079 |
dl |
1.104 |
@SuppressWarnings("unchecked") T tr = (T) r; t = tr; |
1080 |
|
|
x = null; |
1081 |
dl |
1.88 |
} |
1082 |
dl |
1.104 |
if (x != null) |
1083 |
dl |
1.88 |
u = null; |
1084 |
|
|
else if (s instanceof AltResult) { |
1085 |
dl |
1.104 |
x = ((AltResult)s).ex; |
1086 |
dl |
1.88 |
u = null; |
1087 |
|
|
} |
1088 |
|
|
else { |
1089 |
dl |
1.104 |
@SuppressWarnings("unchecked") U us = (U) s; u = us; |
1090 |
dl |
1.88 |
} |
1091 |
dl |
1.104 |
if (x == null) { |
1092 |
dl |
1.88 |
try { |
1093 |
dl |
1.104 |
if (e != null) { |
1094 |
|
|
e.execute(new AsyncAcceptBoth<T,U,V>(d, t, u, f)); |
1095 |
|
|
return; |
1096 |
|
|
} |
1097 |
|
|
f.accept(t, u); |
1098 |
|
|
} catch (Throwable ex) { |
1099 |
|
|
x = ex; |
1100 |
dl |
1.88 |
} |
1101 |
|
|
} |
1102 |
dl |
1.104 |
d.internalComplete(encodeOutcome(null, x)); |
1103 |
|
|
} |
1104 |
|
|
} |
1105 |
|
|
|
1106 |
|
|
static final class AsyncAcceptBoth<T,U,V> extends Async<V> { |
1107 |
jsr166 |
1.105 |
T arg1; U arg2; BiConsumer<? super T,? super U> fn; |
1108 |
dl |
1.104 |
AsyncAcceptBoth(CompletableFuture<V> dep, T arg1, U arg2, |
1109 |
|
|
BiConsumer<? super T,? super U> fn) { |
1110 |
|
|
super(dep); this.arg1 = arg1; this.arg2 = arg2; this.fn = fn; |
1111 |
|
|
} |
1112 |
jsr166 |
1.105 |
final void compute() { nowAcceptBoth(null, dep, arg1, arg2, fn); } |
1113 |
dl |
1.104 |
private static final long serialVersionUID = 5232453952276885070L; |
1114 |
|
|
} |
1115 |
|
|
|
1116 |
|
|
static final class DelayedAcceptBoth<T,U> extends BiCompletion<Void> { |
1117 |
|
|
BiConsumer<? super T,? super U> fn; |
1118 |
|
|
DelayedAcceptBoth(Executor async, CompletableFuture<Void> dep, |
1119 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, |
1120 |
|
|
BiConsumer<? super T,? super U> fn) { |
1121 |
|
|
super(async, dep, src, snd); this.fn = fn; |
1122 |
|
|
} |
1123 |
|
|
final CompletableFuture<?> tryAct() { |
1124 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a, b; Object r, s; |
1125 |
|
|
if ((d = dep) != null && (a = src) != null && (b = snd) != null && |
1126 |
|
|
(r = a.result) != null && (s = b.result) != null && claim(d)) { |
1127 |
|
|
nowAcceptBoth(async, d, r, s, fn); |
1128 |
|
|
src = null; snd = null; fn = null; |
1129 |
|
|
if (d.result != null) return d; |
1130 |
|
|
} |
1131 |
|
|
return null; |
1132 |
dl |
1.88 |
} |
1133 |
|
|
} |
1134 |
|
|
|
1135 |
dl |
1.104 |
private <U> CompletableFuture<Void> doThenAcceptBoth( |
1136 |
|
|
CompletableFuture<? extends U> o, |
1137 |
|
|
BiConsumer<? super T, ? super U> fn, |
1138 |
|
|
Executor e) { |
1139 |
|
|
if (o == null || fn == null) throw new NullPointerException(); |
1140 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1141 |
|
|
Object r = result, s = o.result; |
1142 |
|
|
if (r == null || s == null) |
1143 |
|
|
bipushAnded(o, new DelayedAcceptBoth<T,U>(e, d, this, o, fn)); |
1144 |
|
|
else |
1145 |
|
|
nowAcceptBoth(e, d, r, s, fn); |
1146 |
|
|
return d; |
1147 |
|
|
} |
1148 |
|
|
|
1149 |
|
|
// Runnable/both |
1150 |
|
|
|
1151 |
|
|
static final class DelayedRunAfterBoth extends BiCompletion<Void> { |
1152 |
|
|
Runnable fn; |
1153 |
|
|
DelayedRunAfterBoth(Executor async, CompletableFuture<Void> dep, |
1154 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, |
1155 |
|
|
Runnable fn) { |
1156 |
|
|
super(async, dep, src, snd); this.fn = fn; |
1157 |
|
|
} |
1158 |
|
|
final CompletableFuture<?> tryAct() { |
1159 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a, b; Object r, s; |
1160 |
|
|
if ((d = dep) != null && (a = src) != null && (b = snd) != null && |
1161 |
|
|
(r = a.result) != null && (s = b.result) != null && claim(d)) { |
1162 |
|
|
Throwable x = (r instanceof AltResult) ? |
1163 |
|
|
((AltResult)r).ex : null; |
1164 |
|
|
nowRun(async, d, (x == null) ? s : r, fn); |
1165 |
|
|
src = null; snd = null; fn = null; |
1166 |
|
|
if (d.result != null) return d; |
1167 |
dl |
1.88 |
} |
1168 |
dl |
1.104 |
return null; |
1169 |
dl |
1.88 |
} |
1170 |
dl |
1.104 |
} |
1171 |
|
|
|
1172 |
|
|
private CompletableFuture<Void> doRunAfterBoth( |
1173 |
|
|
CompletableFuture<?> o, Runnable fn, Executor e) { |
1174 |
|
|
if (o == null || fn == null) throw new NullPointerException(); |
1175 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1176 |
|
|
Object r = result, s = o.result; |
1177 |
|
|
if (r == null || s == null) |
1178 |
|
|
bipushAnded(o, new DelayedRunAfterBoth(e, d, this, o, fn)); |
1179 |
dl |
1.101 |
else { |
1180 |
dl |
1.104 |
Throwable x = (r instanceof AltResult) ? ((AltResult)r).ex : null; |
1181 |
|
|
nowRun(e, d, (x == null) ? s : r, fn); |
1182 |
|
|
} |
1183 |
|
|
return d; |
1184 |
|
|
} |
1185 |
|
|
|
1186 |
|
|
// allOf |
1187 |
|
|
|
1188 |
|
|
static <T> void nowAnd(CompletableFuture<T> d, Object r, Object s) { |
1189 |
|
|
if (d != null) { |
1190 |
|
|
Throwable x = (r instanceof AltResult) ? ((AltResult)r).ex : null; |
1191 |
|
|
if (x == null && (s instanceof AltResult)) |
1192 |
|
|
x = ((AltResult)s).ex; |
1193 |
|
|
d.internalComplete(encodeOutcome(null, x)); |
1194 |
dl |
1.88 |
} |
1195 |
|
|
} |
1196 |
|
|
|
1197 |
dl |
1.104 |
static final class DelayedAnd extends BiCompletion<Void> { |
1198 |
|
|
DelayedAnd(CompletableFuture<Void> dep, |
1199 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd) { |
1200 |
|
|
super(null, dep, src, snd); |
1201 |
|
|
} |
1202 |
|
|
final CompletableFuture<?> tryAct() { |
1203 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a, b; Object r, s; |
1204 |
|
|
if ((d = dep) != null && (a = src) != null && (b = snd) != null && |
1205 |
|
|
(r = a.result) != null && (s = b.result) != null && claim(d)) { |
1206 |
|
|
nowAnd(d, r, s); |
1207 |
|
|
src = null; snd = null; |
1208 |
|
|
if (d.result != null) return d; |
1209 |
dl |
1.88 |
} |
1210 |
dl |
1.104 |
return null; |
1211 |
dl |
1.88 |
} |
1212 |
dl |
1.104 |
} |
1213 |
|
|
|
1214 |
|
|
/** Recursively constructs a tree of And completions */ |
1215 |
|
|
private static CompletableFuture<Void> doAllOf(CompletableFuture<?>[] cfs, |
1216 |
|
|
int lo, int hi) { |
1217 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1218 |
|
|
if (lo > hi) // empty |
1219 |
|
|
d.result = NIL; |
1220 |
dl |
1.101 |
else { |
1221 |
dl |
1.104 |
int mid = (lo + hi) >>> 1; |
1222 |
|
|
CompletableFuture<?> fst = (lo == mid ? cfs[lo] : |
1223 |
|
|
doAllOf(cfs, lo, mid)); |
1224 |
|
|
CompletableFuture<?> snd = (lo == hi ? fst : // and fst with self |
1225 |
|
|
(hi == mid+1) ? cfs[hi] : |
1226 |
|
|
doAllOf(cfs, mid+1, hi)); |
1227 |
|
|
Object r = fst.result, s = snd.result; // throw NPE if null elements |
1228 |
|
|
if (r == null || s == null) { |
1229 |
|
|
DelayedAnd a = new DelayedAnd(d, fst, snd); |
1230 |
|
|
if (fst == snd) |
1231 |
|
|
fst.unipush(a); |
1232 |
|
|
else |
1233 |
|
|
fst.bipushAnded(snd, a); |
1234 |
dl |
1.88 |
} |
1235 |
dl |
1.104 |
else |
1236 |
|
|
nowAnd(d, r, s); |
1237 |
dl |
1.88 |
} |
1238 |
dl |
1.104 |
return d; |
1239 |
dl |
1.88 |
} |
1240 |
|
|
|
1241 |
dl |
1.104 |
/* ------------- Two-source Ored -------------- */ |
1242 |
|
|
|
1243 |
|
|
/* Pushes c on to completions and o's completions unless either done. */ |
1244 |
|
|
private <U> void bipushOred(CompletableFuture<?> o, BiCompletion<U> c) { |
1245 |
|
|
if (c != null && o != null) { |
1246 |
|
|
CompletableFuture<?> d; |
1247 |
|
|
while (o.result == null && result == null) { |
1248 |
|
|
if (casCompletions(c.next = completions, c)) { |
1249 |
|
|
CoBiCompletion<U> q = new CoBiCompletion<U>(c); |
1250 |
|
|
while (result == null && o.result == null && |
1251 |
|
|
!o.casCompletions(q.next = o.completions, q)) |
1252 |
|
|
q.next = null; |
1253 |
|
|
break; |
1254 |
dl |
1.88 |
} |
1255 |
dl |
1.104 |
c.next = null; |
1256 |
dl |
1.88 |
} |
1257 |
dl |
1.104 |
if ((d = c.tryAct()) != null) |
1258 |
|
|
d.postComplete(); |
1259 |
|
|
if (o.result != null) |
1260 |
|
|
o.postComplete(); |
1261 |
|
|
if (result != null) |
1262 |
|
|
postComplete(); |
1263 |
dl |
1.88 |
} |
1264 |
dl |
1.104 |
} |
1265 |
|
|
|
1266 |
|
|
// Function/applyEither |
1267 |
|
|
|
1268 |
|
|
static final class DelayedApplyToEither<T,U> extends BiCompletion<U> { |
1269 |
|
|
Function<? super T,? extends U> fn; |
1270 |
|
|
DelayedApplyToEither(Executor async, CompletableFuture<U> dep, |
1271 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, |
1272 |
|
|
Function<? super T,? extends U> fn) { |
1273 |
|
|
super(async, dep, src, snd); this.fn = fn; |
1274 |
|
|
} |
1275 |
|
|
final CompletableFuture<?> tryAct() { |
1276 |
|
|
CompletableFuture<U> d; CompletableFuture<?> a, b; Object r; |
1277 |
|
|
if ((d = dep) != null && (a = src) != null && (b = snd) != null && |
1278 |
|
|
((r = a.result) != null || (r = b.result) != null) && |
1279 |
|
|
claim(d)) { |
1280 |
|
|
nowApply(async, d, r, fn); |
1281 |
|
|
src = null; snd = null; fn = null; |
1282 |
|
|
if (d.result != null) return d; |
1283 |
dl |
1.88 |
} |
1284 |
dl |
1.104 |
return null; |
1285 |
dl |
1.88 |
} |
1286 |
|
|
} |
1287 |
|
|
|
1288 |
dl |
1.104 |
private <U> CompletableFuture<U> doApplyToEither( |
1289 |
|
|
CompletableFuture<? extends T> o, |
1290 |
|
|
Function<? super T, U> fn, Executor e) { |
1291 |
|
|
if (o == null || fn == null) throw new NullPointerException(); |
1292 |
|
|
CompletableFuture<U> d = new CompletableFuture<U>(); |
1293 |
|
|
Object r = result; |
1294 |
|
|
if (r == null && (r = o.result) == null) |
1295 |
|
|
bipushOred(o, new DelayedApplyToEither<T,U>(e, d, this, o, fn)); |
1296 |
|
|
else |
1297 |
|
|
nowApply(e, d, r, fn); |
1298 |
|
|
return d; |
1299 |
|
|
} |
1300 |
|
|
|
1301 |
|
|
// Consumer/acceptEither |
1302 |
|
|
|
1303 |
|
|
static final class DelayedAcceptEither<T> extends BiCompletion<Void> { |
1304 |
|
|
Consumer<? super T> fn; |
1305 |
|
|
DelayedAcceptEither(Executor async, CompletableFuture<Void> dep, |
1306 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, |
1307 |
|
|
Consumer<? super T> fn) { |
1308 |
|
|
super(async, dep, src, snd); this.fn = fn; |
1309 |
|
|
} |
1310 |
|
|
final CompletableFuture<?> tryAct() { |
1311 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a, b; Object r; |
1312 |
|
|
if ((d = dep) != null && (a = src) != null && (b = snd) != null && |
1313 |
|
|
((r = a.result) != null || (r = b.result) != null) && |
1314 |
|
|
claim(d)) { |
1315 |
|
|
nowAccept(async, d, r, fn); |
1316 |
|
|
src = null; snd = null; fn = null; |
1317 |
|
|
if (d.result != null) return d; |
1318 |
dl |
1.88 |
} |
1319 |
dl |
1.104 |
return null; |
1320 |
dl |
1.88 |
} |
1321 |
dl |
1.104 |
} |
1322 |
|
|
|
1323 |
|
|
private CompletableFuture<Void> doAcceptEither( |
1324 |
|
|
CompletableFuture<? extends T> o, |
1325 |
|
|
Consumer<? super T> fn, Executor e) { |
1326 |
|
|
if (o == null || fn == null) throw new NullPointerException(); |
1327 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1328 |
|
|
Object r = result; |
1329 |
|
|
if (r == null && (r = o.result) == null) |
1330 |
|
|
bipushOred(o, new DelayedAcceptEither<T>(e, d, this, o, fn)); |
1331 |
|
|
else |
1332 |
|
|
nowAccept(e, d, r, fn); |
1333 |
|
|
return d; |
1334 |
|
|
} |
1335 |
|
|
|
1336 |
|
|
// Runnable/runEither |
1337 |
|
|
|
1338 |
|
|
static final class DelayedRunAfterEither extends BiCompletion<Void> { |
1339 |
|
|
Runnable fn; |
1340 |
|
|
DelayedRunAfterEither(Executor async, CompletableFuture<Void> dep, |
1341 |
|
|
CompletableFuture<?> src, |
1342 |
|
|
CompletableFuture<?> snd, Runnable fn) { |
1343 |
|
|
super(async, dep, src, snd); this.fn = fn; |
1344 |
|
|
} |
1345 |
|
|
final CompletableFuture<?> tryAct() { |
1346 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a, b; Object r; |
1347 |
|
|
if ((d = dep) != null && (a = src) != null && (b = snd) != null && |
1348 |
|
|
((r = a.result) != null || (r = b.result) != null) && |
1349 |
|
|
claim(d)) { |
1350 |
|
|
nowRun(async, d, r, fn); |
1351 |
|
|
src = null; snd = null; fn = null; |
1352 |
|
|
if (d.result != null) return d; |
1353 |
dl |
1.88 |
} |
1354 |
dl |
1.104 |
return null; |
1355 |
dl |
1.88 |
} |
1356 |
|
|
} |
1357 |
|
|
|
1358 |
dl |
1.104 |
private CompletableFuture<Void> doRunAfterEither( |
1359 |
|
|
CompletableFuture<?> o, Runnable fn, Executor e) { |
1360 |
|
|
if (o == null || fn == null) throw new NullPointerException(); |
1361 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1362 |
|
|
Object r = result; |
1363 |
|
|
if (r == null && (r = o.result) == null) |
1364 |
|
|
bipushOred(o, new DelayedRunAfterEither(e, d, this, o, fn)); |
1365 |
|
|
else |
1366 |
|
|
nowRun(e, d, r, fn); |
1367 |
|
|
return d; |
1368 |
|
|
} |
1369 |
|
|
|
1370 |
|
|
/* ------------- Signallers -------------- */ |
1371 |
|
|
|
1372 |
|
|
/** |
1373 |
|
|
* Heuristic spin value for waitingGet() before blocking on |
1374 |
|
|
* multiprocessors |
1375 |
|
|
*/ |
1376 |
|
|
static final int SPINS = (Runtime.getRuntime().availableProcessors() > 1 ? |
1377 |
|
|
1 << 8 : 0); |
1378 |
|
|
|
1379 |
|
|
/** |
1380 |
|
|
* Completion for recording and releasing a waiting thread. See |
1381 |
|
|
* other classes such as Phaser and SynchronousQueue for more |
1382 |
|
|
* detailed explanation. This class implements ManagedBlocker to |
1383 |
|
|
* avoid starvation when blocking actions pile up in |
1384 |
|
|
* ForkJoinPools. |
1385 |
|
|
*/ |
1386 |
|
|
static final class Signaller extends Completion<Void> |
1387 |
|
|
implements ForkJoinPool.ManagedBlocker { |
1388 |
|
|
long nanos; // wait time if timed |
1389 |
|
|
final long deadline; // non-zero if timed |
1390 |
|
|
volatile int interruptControl; // > 0: interruptible, < 0: interrupted |
1391 |
|
|
volatile Thread thread; |
1392 |
|
|
Signaller(boolean interruptible, long nanos, long deadline) { |
1393 |
|
|
this.thread = Thread.currentThread(); |
1394 |
|
|
this.interruptControl = interruptible ? 1 : 0; |
1395 |
|
|
this.nanos = nanos; |
1396 |
|
|
this.deadline = deadline; |
1397 |
|
|
} |
1398 |
|
|
final CompletableFuture<?> tryAct() { |
1399 |
|
|
Thread w = thread; |
1400 |
|
|
if (w != null) { |
1401 |
|
|
thread = null; // no need to CAS |
1402 |
|
|
LockSupport.unpark(w); |
1403 |
dl |
1.88 |
} |
1404 |
dl |
1.104 |
return null; |
1405 |
dl |
1.88 |
} |
1406 |
dl |
1.104 |
public boolean isReleasable() { |
1407 |
|
|
if (thread == null) |
1408 |
|
|
return true; |
1409 |
|
|
if (Thread.interrupted()) { |
1410 |
|
|
int i = interruptControl; |
1411 |
|
|
interruptControl = -1; |
1412 |
|
|
if (i > 0) |
1413 |
|
|
return true; |
1414 |
dl |
1.88 |
} |
1415 |
dl |
1.104 |
if (deadline != 0L && |
1416 |
|
|
(nanos <= 0L || (nanos = deadline - System.nanoTime()) <= 0L)) { |
1417 |
|
|
thread = null; |
1418 |
|
|
return true; |
1419 |
dl |
1.88 |
} |
1420 |
dl |
1.104 |
return false; |
1421 |
|
|
} |
1422 |
|
|
public boolean block() { |
1423 |
|
|
if (isReleasable()) |
1424 |
|
|
return true; |
1425 |
|
|
else if (deadline == 0L) |
1426 |
|
|
LockSupport.park(this); |
1427 |
|
|
else if (nanos > 0L) |
1428 |
|
|
LockSupport.parkNanos(this, nanos); |
1429 |
|
|
return isReleasable(); |
1430 |
dl |
1.88 |
} |
1431 |
|
|
} |
1432 |
|
|
|
1433 |
dl |
1.104 |
/** |
1434 |
|
|
* Returns raw result after waiting, or null if interruptible and |
1435 |
|
|
* interrupted. |
1436 |
|
|
*/ |
1437 |
|
|
private Object waitingGet(boolean interruptible) { |
1438 |
|
|
Signaller q = null; |
1439 |
|
|
boolean queued = false; |
1440 |
|
|
int spins = SPINS; |
1441 |
dl |
1.88 |
Object r; |
1442 |
dl |
1.104 |
while ((r = result) == null) { |
1443 |
|
|
if (spins > 0) { |
1444 |
|
|
if (ThreadLocalRandom.nextSecondarySeed() >= 0) |
1445 |
|
|
--spins; |
1446 |
dl |
1.88 |
} |
1447 |
dl |
1.104 |
else if (q == null) |
1448 |
|
|
q = new Signaller(interruptible, 0L, 0L); |
1449 |
|
|
else if (!queued) |
1450 |
|
|
queued = casCompletions(q.next = completions, q); |
1451 |
|
|
else if (interruptible && q.interruptControl < 0) { |
1452 |
|
|
q.thread = null; |
1453 |
|
|
removeCancelledSignallers(); |
1454 |
|
|
return null; |
1455 |
dl |
1.88 |
} |
1456 |
dl |
1.104 |
else if (q.thread != null && result == null) { |
1457 |
|
|
try { |
1458 |
|
|
ForkJoinPool.managedBlock(q); |
1459 |
|
|
} catch (InterruptedException ie) { |
1460 |
|
|
q.interruptControl = -1; |
1461 |
|
|
} |
1462 |
dl |
1.88 |
} |
1463 |
dl |
1.104 |
} |
1464 |
|
|
if (q != null) { |
1465 |
|
|
q.thread = null; |
1466 |
|
|
if (q.interruptControl < 0) { |
1467 |
|
|
if (interruptible) |
1468 |
|
|
r = null; // report interruption |
1469 |
dl |
1.88 |
else |
1470 |
dl |
1.104 |
Thread.currentThread().interrupt(); |
1471 |
dl |
1.88 |
} |
1472 |
|
|
} |
1473 |
dl |
1.104 |
postComplete(); |
1474 |
|
|
return r; |
1475 |
dl |
1.88 |
} |
1476 |
|
|
|
1477 |
dl |
1.104 |
/** |
1478 |
|
|
* Returns raw result after waiting, or null if interrupted, or |
1479 |
|
|
* throws TimeoutException on timeout. |
1480 |
|
|
*/ |
1481 |
|
|
private Object timedGet(long nanos) throws TimeoutException { |
1482 |
|
|
if (Thread.interrupted()) |
1483 |
|
|
return null; |
1484 |
|
|
if (nanos <= 0L) |
1485 |
|
|
throw new TimeoutException(); |
1486 |
|
|
long d = System.nanoTime() + nanos; |
1487 |
|
|
Signaller q = new Signaller(true, nanos, d == 0L ? 1L : d); // avoid 0 |
1488 |
|
|
boolean queued = false; |
1489 |
dl |
1.88 |
Object r; |
1490 |
dl |
1.104 |
while ((r = result) == null) { |
1491 |
|
|
if (!queued) |
1492 |
|
|
queued = casCompletions(q.next = completions, q); |
1493 |
|
|
else if (q.interruptControl < 0 || q.nanos <= 0L) { |
1494 |
|
|
q.thread = null; |
1495 |
|
|
removeCancelledSignallers(); |
1496 |
|
|
if (q.interruptControl < 0) |
1497 |
|
|
return null; |
1498 |
|
|
throw new TimeoutException(); |
1499 |
|
|
} |
1500 |
|
|
else if (q.thread != null && result == null) { |
1501 |
|
|
try { |
1502 |
|
|
ForkJoinPool.managedBlock(q); |
1503 |
|
|
} catch (InterruptedException ie) { |
1504 |
|
|
q.interruptControl = -1; |
1505 |
|
|
} |
1506 |
dl |
1.88 |
} |
1507 |
|
|
} |
1508 |
dl |
1.104 |
q.thread = null; |
1509 |
|
|
postComplete(); |
1510 |
|
|
return (q.interruptControl < 0) ? null : r; |
1511 |
|
|
} |
1512 |
|
|
|
1513 |
|
|
/** |
1514 |
|
|
* Unlinks cancelled Signallers to avoid accumulating garbage. |
1515 |
|
|
* Internal nodes are simply unspliced without CAS since it is |
1516 |
|
|
* harmless if they are traversed anyway. To avoid effects of |
1517 |
|
|
* unsplicing from already removed nodes, the list is retraversed |
1518 |
|
|
* in case of an apparent race. |
1519 |
|
|
*/ |
1520 |
|
|
private void removeCancelledSignallers() { |
1521 |
|
|
for (Completion<?> p = null, q = completions; q != null;) { |
1522 |
|
|
Completion<?> s = q.next; |
1523 |
|
|
if ((q instanceof Signaller) && ((Signaller)q).thread == null) { |
1524 |
|
|
if (p != null) { |
1525 |
|
|
p.next = s; |
1526 |
|
|
if (!(p instanceof Signaller) || |
1527 |
|
|
((Signaller)p).thread != null) |
1528 |
|
|
break; |
1529 |
|
|
} |
1530 |
|
|
else if (casCompletions(q, s)) |
1531 |
|
|
break; |
1532 |
|
|
p = null; // restart |
1533 |
|
|
q = completions; |
1534 |
dl |
1.88 |
} |
1535 |
|
|
else { |
1536 |
dl |
1.104 |
p = q; |
1537 |
|
|
q = s; |
1538 |
dl |
1.88 |
} |
1539 |
|
|
} |
1540 |
|
|
} |
1541 |
|
|
|
1542 |
dl |
1.104 |
/* ------------- public methods -------------- */ |
1543 |
dl |
1.88 |
|
1544 |
|
|
/** |
1545 |
|
|
* Creates a new incomplete CompletableFuture. |
1546 |
|
|
*/ |
1547 |
|
|
public CompletableFuture() { |
1548 |
|
|
} |
1549 |
|
|
|
1550 |
|
|
/** |
1551 |
|
|
* Returns a new CompletableFuture that is asynchronously completed |
1552 |
|
|
* by a task running in the {@link ForkJoinPool#commonPool()} with |
1553 |
|
|
* the value obtained by calling the given Supplier. |
1554 |
|
|
* |
1555 |
|
|
* @param supplier a function returning the value to be used |
1556 |
|
|
* to complete the returned CompletableFuture |
1557 |
jsr166 |
1.95 |
* @param <U> the function's return type |
1558 |
dl |
1.88 |
* @return the new CompletableFuture |
1559 |
|
|
*/ |
1560 |
|
|
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier) { |
1561 |
|
|
if (supplier == null) throw new NullPointerException(); |
1562 |
dl |
1.104 |
CompletableFuture<U> d = new CompletableFuture<U>(); |
1563 |
|
|
asyncPool.execute(new AsyncSupply<U>(d, supplier)); |
1564 |
|
|
return d; |
1565 |
dl |
1.88 |
} |
1566 |
|
|
|
1567 |
|
|
/** |
1568 |
|
|
* Returns a new CompletableFuture that is asynchronously completed |
1569 |
|
|
* by a task running in the given executor with the value obtained |
1570 |
|
|
* by calling the given Supplier. |
1571 |
|
|
* |
1572 |
|
|
* @param supplier a function returning the value to be used |
1573 |
|
|
* to complete the returned CompletableFuture |
1574 |
|
|
* @param executor the executor to use for asynchronous execution |
1575 |
jsr166 |
1.95 |
* @param <U> the function's return type |
1576 |
dl |
1.88 |
* @return the new CompletableFuture |
1577 |
|
|
*/ |
1578 |
|
|
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier, |
1579 |
|
|
Executor executor) { |
1580 |
|
|
if (executor == null || supplier == null) |
1581 |
|
|
throw new NullPointerException(); |
1582 |
dl |
1.104 |
CompletableFuture<U> d = new CompletableFuture<U>(); |
1583 |
|
|
executor.execute(new AsyncSupply<U>(d, supplier)); |
1584 |
|
|
return d; |
1585 |
dl |
1.28 |
} |
1586 |
|
|
|
1587 |
|
|
/** |
1588 |
jsr166 |
1.66 |
* Returns a new CompletableFuture that is asynchronously completed |
1589 |
|
|
* by a task running in the {@link ForkJoinPool#commonPool()} after |
1590 |
|
|
* it runs the given action. |
1591 |
dl |
1.28 |
* |
1592 |
|
|
* @param runnable the action to run before completing the |
1593 |
|
|
* returned CompletableFuture |
1594 |
jsr166 |
1.58 |
* @return the new CompletableFuture |
1595 |
dl |
1.28 |
*/ |
1596 |
|
|
public static CompletableFuture<Void> runAsync(Runnable runnable) { |
1597 |
|
|
if (runnable == null) throw new NullPointerException(); |
1598 |
dl |
1.104 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1599 |
|
|
asyncPool.execute(new AsyncRun<Void>(d, runnable)); |
1600 |
|
|
return d; |
1601 |
dl |
1.28 |
} |
1602 |
|
|
|
1603 |
|
|
/** |
1604 |
jsr166 |
1.66 |
* Returns a new CompletableFuture that is asynchronously completed |
1605 |
|
|
* by a task running in the given executor after it runs the given |
1606 |
|
|
* action. |
1607 |
dl |
1.28 |
* |
1608 |
|
|
* @param runnable the action to run before completing the |
1609 |
|
|
* returned CompletableFuture |
1610 |
|
|
* @param executor the executor to use for asynchronous execution |
1611 |
jsr166 |
1.58 |
* @return the new CompletableFuture |
1612 |
dl |
1.28 |
*/ |
1613 |
|
|
public static CompletableFuture<Void> runAsync(Runnable runnable, |
1614 |
|
|
Executor executor) { |
1615 |
|
|
if (executor == null || runnable == null) |
1616 |
|
|
throw new NullPointerException(); |
1617 |
dl |
1.104 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1618 |
|
|
executor.execute(new AsyncRun<Void>(d, runnable)); |
1619 |
|
|
return d; |
1620 |
dl |
1.28 |
} |
1621 |
|
|
|
1622 |
|
|
/** |
1623 |
dl |
1.77 |
* Returns a new CompletableFuture that is already completed with |
1624 |
|
|
* the given value. |
1625 |
|
|
* |
1626 |
|
|
* @param value the value |
1627 |
jsr166 |
1.95 |
* @param <U> the type of the value |
1628 |
dl |
1.77 |
* @return the completed CompletableFuture |
1629 |
|
|
*/ |
1630 |
|
|
public static <U> CompletableFuture<U> completedFuture(U value) { |
1631 |
dl |
1.104 |
CompletableFuture<U> d = new CompletableFuture<U>(); |
1632 |
|
|
d.result = (value == null) ? NIL : value; |
1633 |
|
|
return d; |
1634 |
dl |
1.77 |
} |
1635 |
|
|
|
1636 |
|
|
/** |
1637 |
dl |
1.28 |
* Returns {@code true} if completed in any fashion: normally, |
1638 |
|
|
* exceptionally, or via cancellation. |
1639 |
|
|
* |
1640 |
|
|
* @return {@code true} if completed |
1641 |
|
|
*/ |
1642 |
|
|
public boolean isDone() { |
1643 |
|
|
return result != null; |
1644 |
|
|
} |
1645 |
|
|
|
1646 |
|
|
/** |
1647 |
dl |
1.49 |
* Waits if necessary for this future to complete, and then |
1648 |
dl |
1.48 |
* returns its result. |
1649 |
dl |
1.28 |
* |
1650 |
dl |
1.48 |
* @return the result value |
1651 |
|
|
* @throws CancellationException if this future was cancelled |
1652 |
|
|
* @throws ExecutionException if this future completed exceptionally |
1653 |
dl |
1.28 |
* @throws InterruptedException if the current thread was interrupted |
1654 |
|
|
* while waiting |
1655 |
|
|
*/ |
1656 |
|
|
public T get() throws InterruptedException, ExecutionException { |
1657 |
jsr166 |
1.105 |
Object r; |
1658 |
dl |
1.104 |
return reportGet((r = result) == null ? waitingGet(true) : r); |
1659 |
dl |
1.28 |
} |
1660 |
|
|
|
1661 |
|
|
/** |
1662 |
dl |
1.49 |
* Waits if necessary for at most the given time for this future |
1663 |
|
|
* to complete, and then returns its result, if available. |
1664 |
dl |
1.28 |
* |
1665 |
|
|
* @param timeout the maximum time to wait |
1666 |
|
|
* @param unit the time unit of the timeout argument |
1667 |
dl |
1.48 |
* @return the result value |
1668 |
|
|
* @throws CancellationException if this future was cancelled |
1669 |
|
|
* @throws ExecutionException if this future completed exceptionally |
1670 |
dl |
1.28 |
* @throws InterruptedException if the current thread was interrupted |
1671 |
|
|
* while waiting |
1672 |
|
|
* @throws TimeoutException if the wait timed out |
1673 |
|
|
*/ |
1674 |
|
|
public T get(long timeout, TimeUnit unit) |
1675 |
|
|
throws InterruptedException, ExecutionException, TimeoutException { |
1676 |
jsr166 |
1.105 |
Object r; |
1677 |
dl |
1.28 |
long nanos = unit.toNanos(timeout); |
1678 |
dl |
1.104 |
return reportGet((r = result) == null ? timedGet(nanos) : r); |
1679 |
dl |
1.28 |
} |
1680 |
|
|
|
1681 |
|
|
/** |
1682 |
|
|
* Returns the result value when complete, or throws an |
1683 |
|
|
* (unchecked) exception if completed exceptionally. To better |
1684 |
|
|
* conform with the use of common functional forms, if a |
1685 |
|
|
* computation involved in the completion of this |
1686 |
|
|
* CompletableFuture threw an exception, this method throws an |
1687 |
|
|
* (unchecked) {@link CompletionException} with the underlying |
1688 |
|
|
* exception as its cause. |
1689 |
|
|
* |
1690 |
|
|
* @return the result value |
1691 |
|
|
* @throws CancellationException if the computation was cancelled |
1692 |
jsr166 |
1.55 |
* @throws CompletionException if this future completed |
1693 |
|
|
* exceptionally or a completion computation threw an exception |
1694 |
dl |
1.28 |
*/ |
1695 |
|
|
public T join() { |
1696 |
dl |
1.104 |
Object r; |
1697 |
jsr166 |
1.105 |
return reportJoin((r = result) == null ? waitingGet(false) : r); |
1698 |
dl |
1.28 |
} |
1699 |
|
|
|
1700 |
|
|
/** |
1701 |
|
|
* Returns the result value (or throws any encountered exception) |
1702 |
|
|
* if completed, else returns the given valueIfAbsent. |
1703 |
|
|
* |
1704 |
|
|
* @param valueIfAbsent the value to return if not completed |
1705 |
|
|
* @return the result value, if completed, else the given valueIfAbsent |
1706 |
|
|
* @throws CancellationException if the computation was cancelled |
1707 |
jsr166 |
1.55 |
* @throws CompletionException if this future completed |
1708 |
|
|
* exceptionally or a completion computation threw an exception |
1709 |
dl |
1.28 |
*/ |
1710 |
|
|
public T getNow(T valueIfAbsent) { |
1711 |
dl |
1.104 |
Object r; |
1712 |
jsr166 |
1.106 |
return ((r = result) == null) ? valueIfAbsent : reportJoin(r); |
1713 |
dl |
1.28 |
} |
1714 |
|
|
|
1715 |
|
|
/** |
1716 |
|
|
* If not already completed, sets the value returned by {@link |
1717 |
|
|
* #get()} and related methods to the given value. |
1718 |
|
|
* |
1719 |
|
|
* @param value the result value |
1720 |
|
|
* @return {@code true} if this invocation caused this CompletableFuture |
1721 |
|
|
* to transition to a completed state, else {@code false} |
1722 |
|
|
*/ |
1723 |
|
|
public boolean complete(T value) { |
1724 |
dl |
1.104 |
boolean triggered = internalComplete(value == null ? NIL : value); |
1725 |
|
|
postComplete(); |
1726 |
dl |
1.28 |
return triggered; |
1727 |
|
|
} |
1728 |
|
|
|
1729 |
|
|
/** |
1730 |
|
|
* If not already completed, causes invocations of {@link #get()} |
1731 |
|
|
* and related methods to throw the given exception. |
1732 |
|
|
* |
1733 |
|
|
* @param ex the exception |
1734 |
|
|
* @return {@code true} if this invocation caused this CompletableFuture |
1735 |
|
|
* to transition to a completed state, else {@code false} |
1736 |
|
|
*/ |
1737 |
|
|
public boolean completeExceptionally(Throwable ex) { |
1738 |
|
|
if (ex == null) throw new NullPointerException(); |
1739 |
dl |
1.104 |
boolean triggered = internalComplete(new AltResult(ex)); |
1740 |
|
|
postComplete(); |
1741 |
dl |
1.28 |
return triggered; |
1742 |
|
|
} |
1743 |
|
|
|
1744 |
dl |
1.104 |
public <U> CompletableFuture<U> thenApply( |
1745 |
|
|
Function<? super T,? extends U> fn) { |
1746 |
dl |
1.28 |
return doThenApply(fn, null); |
1747 |
|
|
} |
1748 |
|
|
|
1749 |
dl |
1.104 |
public <U> CompletableFuture<U> thenApplyAsync( |
1750 |
|
|
Function<? super T,? extends U> fn) { |
1751 |
|
|
return doThenApply(fn, asyncPool); |
1752 |
dl |
1.17 |
} |
1753 |
|
|
|
1754 |
dl |
1.104 |
public <U> CompletableFuture<U> thenApplyAsync( |
1755 |
|
|
Function<? super T,? extends U> fn, Executor executor) { |
1756 |
dl |
1.28 |
if (executor == null) throw new NullPointerException(); |
1757 |
|
|
return doThenApply(fn, executor); |
1758 |
|
|
} |
1759 |
dl |
1.1 |
|
1760 |
dl |
1.104 |
public CompletableFuture<Void> thenAccept(Consumer<? super T> action) { |
1761 |
dl |
1.88 |
return doThenAccept(action, null); |
1762 |
dl |
1.28 |
} |
1763 |
|
|
|
1764 |
dl |
1.104 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> action) { |
1765 |
|
|
return doThenAccept(action, asyncPool); |
1766 |
dl |
1.28 |
} |
1767 |
|
|
|
1768 |
dl |
1.104 |
public CompletableFuture<Void> thenAcceptAsync( |
1769 |
|
|
Consumer<? super T> action, Executor executor) { |
1770 |
dl |
1.28 |
if (executor == null) throw new NullPointerException(); |
1771 |
dl |
1.88 |
return doThenAccept(action, executor); |
1772 |
dl |
1.7 |
} |
1773 |
|
|
|
1774 |
dl |
1.104 |
public CompletableFuture<Void> thenRun(Runnable action) { |
1775 |
dl |
1.28 |
return doThenRun(action, null); |
1776 |
|
|
} |
1777 |
|
|
|
1778 |
dl |
1.104 |
public CompletableFuture<Void> thenRunAsync(Runnable action) { |
1779 |
|
|
return doThenRun(action, asyncPool); |
1780 |
dl |
1.28 |
} |
1781 |
|
|
|
1782 |
dl |
1.104 |
public CompletableFuture<Void> thenRunAsync( |
1783 |
|
|
Runnable action, Executor executor) { |
1784 |
dl |
1.28 |
if (executor == null) throw new NullPointerException(); |
1785 |
|
|
return doThenRun(action, executor); |
1786 |
|
|
} |
1787 |
|
|
|
1788 |
dl |
1.104 |
public <U,V> CompletableFuture<V> thenCombine( |
1789 |
|
|
CompletionStage<? extends U> other, |
1790 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
1791 |
dl |
1.88 |
return doThenCombine(other.toCompletableFuture(), fn, null); |
1792 |
dl |
1.28 |
} |
1793 |
|
|
|
1794 |
dl |
1.104 |
public <U,V> CompletableFuture<V> thenCombineAsync( |
1795 |
|
|
CompletionStage<? extends U> other, |
1796 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
1797 |
|
|
return doThenCombine(other.toCompletableFuture(), fn, asyncPool); |
1798 |
dl |
1.28 |
} |
1799 |
|
|
|
1800 |
dl |
1.104 |
public <U,V> CompletableFuture<V> thenCombineAsync( |
1801 |
|
|
CompletionStage<? extends U> other, |
1802 |
|
|
BiFunction<? super T,? super U,? extends V> fn, |
1803 |
|
|
Executor executor) { |
1804 |
dl |
1.28 |
if (executor == null) throw new NullPointerException(); |
1805 |
dl |
1.88 |
return doThenCombine(other.toCompletableFuture(), fn, executor); |
1806 |
dl |
1.1 |
} |
1807 |
|
|
|
1808 |
dl |
1.104 |
public <U> CompletableFuture<Void> thenAcceptBoth( |
1809 |
|
|
CompletionStage<? extends U> other, |
1810 |
|
|
BiConsumer<? super T, ? super U> action) { |
1811 |
dl |
1.88 |
return doThenAcceptBoth(other.toCompletableFuture(), action, null); |
1812 |
dl |
1.28 |
} |
1813 |
|
|
|
1814 |
dl |
1.104 |
public <U> CompletableFuture<Void> thenAcceptBothAsync( |
1815 |
|
|
CompletionStage<? extends U> other, |
1816 |
|
|
BiConsumer<? super T, ? super U> action) { |
1817 |
|
|
return doThenAcceptBoth(other.toCompletableFuture(), action, asyncPool); |
1818 |
dl |
1.28 |
} |
1819 |
|
|
|
1820 |
dl |
1.104 |
public <U> CompletableFuture<Void> thenAcceptBothAsync( |
1821 |
|
|
CompletionStage<? extends U> other, |
1822 |
|
|
BiConsumer<? super T, ? super U> action, |
1823 |
|
|
Executor executor) { |
1824 |
dl |
1.28 |
if (executor == null) throw new NullPointerException(); |
1825 |
dl |
1.88 |
return doThenAcceptBoth(other.toCompletableFuture(), action, executor); |
1826 |
dl |
1.28 |
} |
1827 |
|
|
|
1828 |
dl |
1.104 |
public CompletableFuture<Void> runAfterBoth( |
1829 |
|
|
CompletionStage<?> other, Runnable action) { |
1830 |
dl |
1.88 |
return doRunAfterBoth(other.toCompletableFuture(), action, null); |
1831 |
dl |
1.7 |
} |
1832 |
|
|
|
1833 |
dl |
1.104 |
public CompletableFuture<Void> runAfterBothAsync( |
1834 |
|
|
CompletionStage<?> other, Runnable action) { |
1835 |
|
|
return doRunAfterBoth(other.toCompletableFuture(), action, asyncPool); |
1836 |
dl |
1.28 |
} |
1837 |
|
|
|
1838 |
dl |
1.104 |
public CompletableFuture<Void> runAfterBothAsync( |
1839 |
|
|
CompletionStage<?> other, Runnable action, Executor executor) { |
1840 |
dl |
1.28 |
if (executor == null) throw new NullPointerException(); |
1841 |
dl |
1.88 |
return doRunAfterBoth(other.toCompletableFuture(), action, executor); |
1842 |
dl |
1.28 |
} |
1843 |
|
|
|
1844 |
dl |
1.104 |
public <U> CompletableFuture<U> applyToEither( |
1845 |
|
|
CompletionStage<? extends T> other, Function<? super T, U> fn) { |
1846 |
dl |
1.88 |
return doApplyToEither(other.toCompletableFuture(), fn, null); |
1847 |
dl |
1.28 |
} |
1848 |
|
|
|
1849 |
dl |
1.104 |
public <U> CompletableFuture<U> applyToEitherAsync( |
1850 |
|
|
CompletionStage<? extends T> other, Function<? super T, U> fn) { |
1851 |
|
|
return doApplyToEither(other.toCompletableFuture(), fn, asyncPool); |
1852 |
dl |
1.28 |
} |
1853 |
|
|
|
1854 |
dl |
1.48 |
public <U> CompletableFuture<U> applyToEitherAsync |
1855 |
dl |
1.104 |
(CompletionStage<? extends T> other, Function<? super T, U> fn, |
1856 |
dl |
1.48 |
Executor executor) { |
1857 |
dl |
1.28 |
if (executor == null) throw new NullPointerException(); |
1858 |
dl |
1.88 |
return doApplyToEither(other.toCompletableFuture(), fn, executor); |
1859 |
dl |
1.1 |
} |
1860 |
|
|
|
1861 |
dl |
1.104 |
public CompletableFuture<Void> acceptEither( |
1862 |
|
|
CompletionStage<? extends T> other, Consumer<? super T> action) { |
1863 |
dl |
1.88 |
return doAcceptEither(other.toCompletableFuture(), action, null); |
1864 |
dl |
1.28 |
} |
1865 |
|
|
|
1866 |
dl |
1.48 |
public CompletableFuture<Void> acceptEitherAsync |
1867 |
dl |
1.104 |
(CompletionStage<? extends T> other, Consumer<? super T> action) { |
1868 |
|
|
return doAcceptEither(other.toCompletableFuture(), action, asyncPool); |
1869 |
dl |
1.28 |
} |
1870 |
|
|
|
1871 |
dl |
1.104 |
public CompletableFuture<Void> acceptEitherAsync( |
1872 |
|
|
CompletionStage<? extends T> other, Consumer<? super T> action, |
1873 |
|
|
Executor executor) { |
1874 |
dl |
1.28 |
if (executor == null) throw new NullPointerException(); |
1875 |
dl |
1.88 |
return doAcceptEither(other.toCompletableFuture(), action, executor); |
1876 |
dl |
1.7 |
} |
1877 |
|
|
|
1878 |
dl |
1.104 |
public CompletableFuture<Void> runAfterEither( |
1879 |
|
|
CompletionStage<?> other, Runnable action) { |
1880 |
dl |
1.88 |
return doRunAfterEither(other.toCompletableFuture(), action, null); |
1881 |
dl |
1.28 |
} |
1882 |
|
|
|
1883 |
dl |
1.104 |
public CompletableFuture<Void> runAfterEitherAsync( |
1884 |
|
|
CompletionStage<?> other, Runnable action) { |
1885 |
|
|
return doRunAfterEither(other.toCompletableFuture(), action, asyncPool); |
1886 |
dl |
1.28 |
} |
1887 |
|
|
|
1888 |
dl |
1.104 |
public CompletableFuture<Void> runAfterEitherAsync( |
1889 |
|
|
CompletionStage<?> other, Runnable action, Executor executor) { |
1890 |
dl |
1.28 |
if (executor == null) throw new NullPointerException(); |
1891 |
dl |
1.88 |
return doRunAfterEither(other.toCompletableFuture(), action, executor); |
1892 |
dl |
1.1 |
} |
1893 |
|
|
|
1894 |
dl |
1.48 |
public <U> CompletableFuture<U> thenCompose |
1895 |
dl |
1.88 |
(Function<? super T, ? extends CompletionStage<U>> fn) { |
1896 |
jsr166 |
1.81 |
return doThenCompose(fn, null); |
1897 |
dl |
1.37 |
} |
1898 |
|
|
|
1899 |
dl |
1.104 |
public <U> CompletableFuture<U> thenComposeAsync( |
1900 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn) { |
1901 |
|
|
return doThenCompose(fn, asyncPool); |
1902 |
dl |
1.37 |
} |
1903 |
|
|
|
1904 |
dl |
1.104 |
public <U> CompletableFuture<U> thenComposeAsync( |
1905 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn, |
1906 |
|
|
Executor executor) { |
1907 |
dl |
1.37 |
if (executor == null) throw new NullPointerException(); |
1908 |
jsr166 |
1.81 |
return doThenCompose(fn, executor); |
1909 |
dl |
1.37 |
} |
1910 |
|
|
|
1911 |
dl |
1.104 |
public CompletableFuture<T> whenComplete( |
1912 |
|
|
BiConsumer<? super T, ? super Throwable> action) { |
1913 |
dl |
1.88 |
return doWhenComplete(action, null); |
1914 |
|
|
} |
1915 |
|
|
|
1916 |
dl |
1.104 |
public CompletableFuture<T> whenCompleteAsync( |
1917 |
|
|
BiConsumer<? super T, ? super Throwable> action) { |
1918 |
|
|
return doWhenComplete(action, asyncPool); |
1919 |
dl |
1.88 |
} |
1920 |
|
|
|
1921 |
dl |
1.104 |
public CompletableFuture<T> whenCompleteAsync( |
1922 |
|
|
BiConsumer<? super T, ? super Throwable> action, Executor executor) { |
1923 |
dl |
1.88 |
if (executor == null) throw new NullPointerException(); |
1924 |
|
|
return doWhenComplete(action, executor); |
1925 |
|
|
} |
1926 |
|
|
|
1927 |
dl |
1.104 |
public <U> CompletableFuture<U> handle( |
1928 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn) { |
1929 |
dl |
1.88 |
return doHandle(fn, null); |
1930 |
|
|
} |
1931 |
|
|
|
1932 |
dl |
1.104 |
public <U> CompletableFuture<U> handleAsync( |
1933 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn) { |
1934 |
|
|
return doHandle(fn, asyncPool); |
1935 |
dl |
1.88 |
} |
1936 |
|
|
|
1937 |
dl |
1.104 |
public <U> CompletableFuture<U> handleAsync( |
1938 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn, Executor executor) { |
1939 |
dl |
1.88 |
if (executor == null) throw new NullPointerException(); |
1940 |
|
|
return doHandle(fn, executor); |
1941 |
|
|
} |
1942 |
|
|
|
1943 |
|
|
/** |
1944 |
|
|
* Returns this CompletableFuture |
1945 |
|
|
* |
1946 |
|
|
* @return this CompletableFuture |
1947 |
|
|
*/ |
1948 |
|
|
public CompletableFuture<T> toCompletableFuture() { |
1949 |
|
|
return this; |
1950 |
dl |
1.28 |
} |
1951 |
|
|
|
1952 |
dl |
1.88 |
// not in interface CompletionStage |
1953 |
|
|
|
1954 |
dl |
1.28 |
/** |
1955 |
jsr166 |
1.66 |
* Returns a new CompletableFuture that is completed when this |
1956 |
|
|
* CompletableFuture completes, with the result of the given |
1957 |
|
|
* function of the exception triggering this CompletableFuture's |
1958 |
|
|
* completion when it completes exceptionally; otherwise, if this |
1959 |
|
|
* CompletableFuture completes normally, then the returned |
1960 |
|
|
* CompletableFuture also completes normally with the same value. |
1961 |
dl |
1.88 |
* Note: More flexible versions of this functionality are |
1962 |
|
|
* available using methods {@code whenComplete} and {@code handle}. |
1963 |
dl |
1.28 |
* |
1964 |
|
|
* @param fn the function to use to compute the value of the |
1965 |
|
|
* returned CompletableFuture if this CompletableFuture completed |
1966 |
|
|
* exceptionally |
1967 |
|
|
* @return the new CompletableFuture |
1968 |
|
|
*/ |
1969 |
dl |
1.104 |
public CompletableFuture<T> exceptionally( |
1970 |
|
|
Function<Throwable, ? extends T> fn) { |
1971 |
|
|
return doExceptionally(fn); |
1972 |
dl |
1.28 |
} |
1973 |
|
|
|
1974 |
dl |
1.35 |
/* ------------- Arbitrary-arity constructions -------------- */ |
1975 |
|
|
|
1976 |
|
|
/** |
1977 |
|
|
* Returns a new CompletableFuture that is completed when all of |
1978 |
jsr166 |
1.66 |
* the given CompletableFutures complete. If any of the given |
1979 |
jsr166 |
1.69 |
* CompletableFutures complete exceptionally, then the returned |
1980 |
|
|
* CompletableFuture also does so, with a CompletionException |
1981 |
|
|
* holding this exception as its cause. Otherwise, the results, |
1982 |
|
|
* if any, of the given CompletableFutures are not reflected in |
1983 |
|
|
* the returned CompletableFuture, but may be obtained by |
1984 |
|
|
* inspecting them individually. If no CompletableFutures are |
1985 |
|
|
* provided, returns a CompletableFuture completed with the value |
1986 |
|
|
* {@code null}. |
1987 |
dl |
1.35 |
* |
1988 |
|
|
* <p>Among the applications of this method is to await completion |
1989 |
|
|
* of a set of independent CompletableFutures before continuing a |
1990 |
|
|
* program, as in: {@code CompletableFuture.allOf(c1, c2, |
1991 |
|
|
* c3).join();}. |
1992 |
|
|
* |
1993 |
|
|
* @param cfs the CompletableFutures |
1994 |
jsr166 |
1.59 |
* @return a new CompletableFuture that is completed when all of the |
1995 |
dl |
1.35 |
* given CompletableFutures complete |
1996 |
|
|
* @throws NullPointerException if the array or any of its elements are |
1997 |
|
|
* {@code null} |
1998 |
|
|
*/ |
1999 |
|
|
public static CompletableFuture<Void> allOf(CompletableFuture<?>... cfs) { |
2000 |
dl |
1.104 |
return doAllOf(cfs, 0, cfs.length - 1); |
2001 |
dl |
1.35 |
} |
2002 |
|
|
|
2003 |
|
|
/** |
2004 |
dl |
1.76 |
* Returns a new CompletableFuture that is completed when any of |
2005 |
jsr166 |
1.79 |
* the given CompletableFutures complete, with the same result. |
2006 |
|
|
* Otherwise, if it completed exceptionally, the returned |
2007 |
dl |
1.77 |
* CompletableFuture also does so, with a CompletionException |
2008 |
|
|
* holding this exception as its cause. If no CompletableFutures |
2009 |
|
|
* are provided, returns an incomplete CompletableFuture. |
2010 |
dl |
1.35 |
* |
2011 |
|
|
* @param cfs the CompletableFutures |
2012 |
dl |
1.77 |
* @return a new CompletableFuture that is completed with the |
2013 |
|
|
* result or exception of any of the given CompletableFutures when |
2014 |
|
|
* one completes |
2015 |
dl |
1.35 |
* @throws NullPointerException if the array or any of its elements are |
2016 |
|
|
* {@code null} |
2017 |
|
|
*/ |
2018 |
dl |
1.77 |
public static CompletableFuture<Object> anyOf(CompletableFuture<?>... cfs) { |
2019 |
dl |
1.104 |
CompletableFuture<Object> d = new CompletableFuture<Object>(); |
2020 |
|
|
for (int i = 0; i < cfs.length; ++i) { |
2021 |
|
|
CompletableFuture<?> c = cfs[i]; |
2022 |
|
|
Object r = c.result; // throw NPE if null element |
2023 |
|
|
if (d.result == null) { |
2024 |
|
|
if (r == null) |
2025 |
|
|
c.unipush(new DelayedCopy<Object>(d, c)); |
2026 |
|
|
else |
2027 |
|
|
nowCopy(d, r); |
2028 |
dl |
1.77 |
} |
2029 |
dl |
1.35 |
} |
2030 |
dl |
1.104 |
return d; |
2031 |
dl |
1.35 |
} |
2032 |
|
|
|
2033 |
|
|
/* ------------- Control and status methods -------------- */ |
2034 |
|
|
|
2035 |
dl |
1.28 |
/** |
2036 |
dl |
1.37 |
* If not already completed, completes this CompletableFuture with |
2037 |
|
|
* a {@link CancellationException}. Dependent CompletableFutures |
2038 |
|
|
* that have not already completed will also complete |
2039 |
|
|
* exceptionally, with a {@link CompletionException} caused by |
2040 |
|
|
* this {@code CancellationException}. |
2041 |
dl |
1.28 |
* |
2042 |
|
|
* @param mayInterruptIfRunning this value has no effect in this |
2043 |
|
|
* implementation because interrupts are not used to control |
2044 |
|
|
* processing. |
2045 |
|
|
* |
2046 |
|
|
* @return {@code true} if this task is now cancelled |
2047 |
|
|
*/ |
2048 |
|
|
public boolean cancel(boolean mayInterruptIfRunning) { |
2049 |
dl |
1.46 |
boolean cancelled = (result == null) && |
2050 |
dl |
1.104 |
internalComplete(new AltResult(new CancellationException())); |
2051 |
|
|
postComplete(); |
2052 |
dl |
1.48 |
return cancelled || isCancelled(); |
2053 |
dl |
1.28 |
} |
2054 |
|
|
|
2055 |
|
|
/** |
2056 |
|
|
* Returns {@code true} if this CompletableFuture was cancelled |
2057 |
|
|
* before it completed normally. |
2058 |
|
|
* |
2059 |
|
|
* @return {@code true} if this CompletableFuture was cancelled |
2060 |
|
|
* before it completed normally |
2061 |
|
|
*/ |
2062 |
|
|
public boolean isCancelled() { |
2063 |
|
|
Object r; |
2064 |
jsr166 |
1.43 |
return ((r = result) instanceof AltResult) && |
2065 |
|
|
(((AltResult)r).ex instanceof CancellationException); |
2066 |
dl |
1.28 |
} |
2067 |
|
|
|
2068 |
|
|
/** |
2069 |
dl |
1.88 |
* Returns {@code true} if this CompletableFuture completed |
2070 |
dl |
1.91 |
* exceptionally, in any way. Possible causes include |
2071 |
|
|
* cancellation, explicit invocation of {@code |
2072 |
|
|
* completeExceptionally}, and abrupt termination of a |
2073 |
|
|
* CompletionStage action. |
2074 |
dl |
1.88 |
* |
2075 |
|
|
* @return {@code true} if this CompletableFuture completed |
2076 |
|
|
* exceptionally |
2077 |
|
|
*/ |
2078 |
|
|
public boolean isCompletedExceptionally() { |
2079 |
dl |
1.91 |
Object r; |
2080 |
|
|
return ((r = result) instanceof AltResult) && r != NIL; |
2081 |
dl |
1.88 |
} |
2082 |
|
|
|
2083 |
|
|
/** |
2084 |
dl |
1.28 |
* Forcibly sets or resets the value subsequently returned by |
2085 |
jsr166 |
1.42 |
* method {@link #get()} and related methods, whether or not |
2086 |
|
|
* already completed. This method is designed for use only in |
2087 |
|
|
* error recovery actions, and even in such situations may result |
2088 |
|
|
* in ongoing dependent completions using established versus |
2089 |
dl |
1.30 |
* overwritten outcomes. |
2090 |
dl |
1.28 |
* |
2091 |
|
|
* @param value the completion value |
2092 |
|
|
*/ |
2093 |
|
|
public void obtrudeValue(T value) { |
2094 |
|
|
result = (value == null) ? NIL : value; |
2095 |
dl |
1.104 |
postComplete(); |
2096 |
dl |
1.28 |
} |
2097 |
|
|
|
2098 |
dl |
1.30 |
/** |
2099 |
jsr166 |
1.41 |
* Forcibly causes subsequent invocations of method {@link #get()} |
2100 |
|
|
* and related methods to throw the given exception, whether or |
2101 |
|
|
* not already completed. This method is designed for use only in |
2102 |
dl |
1.30 |
* recovery actions, and even in such situations may result in |
2103 |
|
|
* ongoing dependent completions using established versus |
2104 |
|
|
* overwritten outcomes. |
2105 |
|
|
* |
2106 |
|
|
* @param ex the exception |
2107 |
|
|
*/ |
2108 |
|
|
public void obtrudeException(Throwable ex) { |
2109 |
|
|
if (ex == null) throw new NullPointerException(); |
2110 |
|
|
result = new AltResult(ex); |
2111 |
dl |
1.104 |
postComplete(); |
2112 |
dl |
1.30 |
} |
2113 |
|
|
|
2114 |
dl |
1.35 |
/** |
2115 |
|
|
* Returns the estimated number of CompletableFutures whose |
2116 |
|
|
* completions are awaiting completion of this CompletableFuture. |
2117 |
|
|
* This method is designed for use in monitoring system state, not |
2118 |
|
|
* for synchronization control. |
2119 |
|
|
* |
2120 |
|
|
* @return the number of dependent CompletableFutures |
2121 |
|
|
*/ |
2122 |
|
|
public int getNumberOfDependents() { |
2123 |
|
|
int count = 0; |
2124 |
dl |
1.104 |
for (Completion<?> p = completions; p != null; p = p.next) |
2125 |
dl |
1.35 |
++count; |
2126 |
|
|
return count; |
2127 |
|
|
} |
2128 |
|
|
|
2129 |
|
|
/** |
2130 |
|
|
* Returns a string identifying this CompletableFuture, as well as |
2131 |
jsr166 |
1.40 |
* its completion state. The state, in brackets, contains the |
2132 |
dl |
1.35 |
* String {@code "Completed Normally"} or the String {@code |
2133 |
|
|
* "Completed Exceptionally"}, or the String {@code "Not |
2134 |
|
|
* completed"} followed by the number of CompletableFutures |
2135 |
|
|
* dependent upon its completion, if any. |
2136 |
|
|
* |
2137 |
|
|
* @return a string identifying this CompletableFuture, as well as its state |
2138 |
|
|
*/ |
2139 |
|
|
public String toString() { |
2140 |
|
|
Object r = result; |
2141 |
jsr166 |
1.40 |
int count; |
2142 |
|
|
return super.toString() + |
2143 |
|
|
((r == null) ? |
2144 |
|
|
(((count = getNumberOfDependents()) == 0) ? |
2145 |
|
|
"[Not completed]" : |
2146 |
|
|
"[Not completed, " + count + " dependents]") : |
2147 |
|
|
(((r instanceof AltResult) && ((AltResult)r).ex != null) ? |
2148 |
|
|
"[Completed exceptionally]" : |
2149 |
|
|
"[Completed normally]")); |
2150 |
dl |
1.35 |
} |
2151 |
|
|
|
2152 |
dl |
1.1 |
// Unsafe mechanics |
2153 |
|
|
private static final sun.misc.Unsafe UNSAFE; |
2154 |
|
|
private static final long RESULT; |
2155 |
|
|
private static final long COMPLETIONS; |
2156 |
|
|
static { |
2157 |
|
|
try { |
2158 |
|
|
UNSAFE = sun.misc.Unsafe.getUnsafe(); |
2159 |
|
|
Class<?> k = CompletableFuture.class; |
2160 |
|
|
RESULT = UNSAFE.objectFieldOffset |
2161 |
|
|
(k.getDeclaredField("result")); |
2162 |
|
|
COMPLETIONS = UNSAFE.objectFieldOffset |
2163 |
|
|
(k.getDeclaredField("completions")); |
2164 |
dl |
1.104 |
} catch (Exception x) { |
2165 |
|
|
throw new Error(x); |
2166 |
dl |
1.1 |
} |
2167 |
|
|
} |
2168 |
|
|
} |