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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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|
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package java.util.concurrent; |
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import java.util.function.Supplier; |
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import java.util.function.Consumer; |
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import java.util.function.BiConsumer; |
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import java.util.function.Function; |
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import java.util.function.BiFunction; |
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import java.util.concurrent.Future; |
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import java.util.concurrent.TimeUnit; |
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import java.util.concurrent.ForkJoinPool; |
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import java.util.concurrent.ForkJoinTask; |
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import java.util.concurrent.Executor; |
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import java.util.concurrent.ThreadLocalRandom; |
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import java.util.concurrent.ExecutionException; |
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import java.util.concurrent.TimeoutException; |
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import java.util.concurrent.CancellationException; |
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import java.util.concurrent.CompletionException; |
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import java.util.concurrent.CompletionStage; |
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import java.util.concurrent.locks.LockSupport; |
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|
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/** |
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* A {@link Future} that may be explicitly completed (setting its |
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* value and status), and may 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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* <p>When two or more threads attempt to |
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* {@link #complete complete}, |
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* {@link #completeExceptionally completeExceptionally}, or |
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* {@link #cancel cancel} |
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* a CompletableFuture, only one of them succeeds. |
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* |
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* <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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* |
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* <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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* |
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* <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 created to run each task). To simplify |
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* monitoring, debugging, and tracking, all generated asynchronous |
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* tasks are instances of the marker interface {@link |
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* AsynchronousCompletionTask}. </li> |
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* |
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* <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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* <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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* control over the computation that causes it to be completed, |
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* 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 to the sprawl of trapping and associating exceptions |
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* with targets. Minor simplifications rely on (static) NIL (to |
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* box null results) being the only AltResult with a null |
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* exception field, so we don't usually need explicit comparisons. |
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* Even though some of the generics casts are unchecked (see |
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* SuppressWarnings annotations), they are placed to be |
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* appropriate even if checked. |
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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 "stack". There are Completion |
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* classes for each kind of action, grouped into single-input |
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* (UniCompletion), two-input (BiCompletion), projected |
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* (BiCompletions using either (not both) of two inputs), shared |
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* (CoCompletion, used by the second of two sources), zero-input |
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* source actions, and Signallers that unblock waiters. Class |
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* Completion extends ForkJoinTask to enable async execution |
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* (adding no space overhead because we exploit its "tag" methods |
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* to maintain claims). It is also declared as Runnable to allow |
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* usage with arbitrary executors. |
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* |
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* Support for each kind of CompletionStage relies on a separate |
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* class, along with two CompletableFuture methods: |
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* |
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* * A Completion class with name X corresponding to function, |
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* prefaced with "Uni", "Bi", or "Or". Each class contains |
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* fields for source(s), actions, and dependent. They are |
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* boringly similar, differing from others only with respect to |
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* underlying functional forms. We do this so that users don't |
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* encounter layers of adaptors in common usages. We also |
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* include "Relay" classes/methods that don't correspond to user |
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* methods; they copy results from one stage to another. |
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* |
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* * Boolean CompletableFuture method x(...) (for example |
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* uniApply) takes all of the arguments needed to check that an |
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* action is triggerable, and then either runs the action or |
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* arranges its async execution by executing its Completion |
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* argument, if present. The method returns true if known to be |
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* complete. |
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* |
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* * Completion method tryFire(int mode) invokes the associated x |
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* method with its held arguments, and on success cleans up. |
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* The mode argument allows exec to be called twice (SYNC, then |
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* ASYNC); the first to screen and trap exceptions while |
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* arranging to execute, and the second when called from a |
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* task. (A few classes are not used async so take slightly |
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* different forms.) The claim() callback suppresses function |
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* invocation if already claimed by another thread. |
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* |
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* * CompletableFuture method xStage(...) is called from a public |
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* stage method of CompletableFuture x. It screens user |
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* arguments and invokes and/or creates the stage object. If |
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* not async and x is already complete, the action is run |
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* immediately. Otherwise a Completion c is created, pushed to |
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* x's stack (unless done), and started or triggered via |
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* c.tryFire. This also covers races possible if x completes |
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* while pushing. Classes with two inputs (for example BiApply) |
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* deal with races across both while pushing actions. The |
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* second completion is a CoCompletion pointing to the first, |
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* shared so that at most one performs the action. The |
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* multiple-arity methods allOf and anyOf do this pairwise to |
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* form trees of completions. |
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* |
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* Note that the generic type parameters of methods vary according |
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* to whether "this" is a source, dependent, or completion. |
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* |
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* Method postComplete is called upon completion unless the target |
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* is guaranteed not to be observable (i.e., not yet returned or |
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* linked). Multiple threads can call postComplete, which |
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* atomically pops each dependent action, and tries to trigger it |
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* via method exec. Triggering can propagate recursively, so exec |
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* in NESTED mode returns its completed dependent (if one exists) |
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* for further processing by its caller (see method postFire). |
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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 null out fields as soon as |
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* possible (see especially method Completion.detach). The |
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* screening checks needed anyway harmlessly ignore null arguments |
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* that may have been obtained during races with threads nulling |
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* out fields. We also try to unlink fired Completions from |
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* stacks that might never be popped (see method postFire). |
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* Completion fields need not be declared as final or volatile |
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* because they are only visible to other threads upon safe |
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* publication. |
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*/ |
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|
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volatile Object result; // Either the result or boxed AltResult |
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volatile Completion stack; // Top of Treiber stack of dependent actions |
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|
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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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|
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final boolean completeValue(T t) { |
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return UNSAFE.compareAndSwapObject(this, RESULT, null, |
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(t == null) ? NIL : t); |
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} |
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|
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final boolean completeNil() { |
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return UNSAFE.compareAndSwapObject(this, RESULT, null, NIL); |
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} |
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|
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final boolean completeThrowable(Throwable x) { |
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return UNSAFE.compareAndSwapObject(this, RESULT, null, |
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encodeThrowable(x)); |
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} |
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|
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final boolean completeRelay(Object r) { |
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return UNSAFE.compareAndSwapObject(this, RESULT, null, encodeRelay(r)); |
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} |
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|
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final boolean casStack(Completion cmp, Completion val) { |
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return UNSAFE.compareAndSwapObject(this, STACK, cmp, val); |
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} |
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|
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/* ------------- Encoding and decoding outcomes -------------- */ |
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|
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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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} |
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|
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static final AltResult NIL = new AltResult(null); |
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|
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/** |
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* 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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*/ |
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static AltResult encodeThrowable(Throwable x) { |
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return new AltResult((x instanceof CompletionException) ? x : |
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new CompletionException(x)); |
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} |
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|
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/** |
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* Returns the encoding of the given arguments: if the exception |
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* is non-null, encodes as AltResult. Otherwise uses the given |
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* value, boxed as NIL if null. |
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*/ |
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Object encodeOutcome(T t, Throwable x) { |
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return (x == null) ? (t == null) ? NIL : t : encodeThrowable(x); |
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} |
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|
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/** |
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* Returns the encoding of a copied outcome; if exceptional, |
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* rewraps as a CompletionException, else returns argument. |
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*/ |
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static Object encodeRelay(Object r) { |
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Throwable x; |
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return (((r instanceof AltResult) && |
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(x = ((AltResult)r).ex) != null && |
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!(x instanceof CompletionException)) ? |
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new AltResult(new CompletionException(x)) : r); |
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} |
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|
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/** |
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* Reports result using Future.get conventions. |
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*/ |
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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) |
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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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(cause = x.getCause()) != null) |
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x = cause; |
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throw new ExecutionException(x); |
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} |
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@SuppressWarnings("unchecked") T t = (T) r; |
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return t; |
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} |
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|
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/** |
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* Decodes outcome to return result or throw unchecked exception. |
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*/ |
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private static <T> T reportJoin(Object r) { |
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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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} |
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@SuppressWarnings("unchecked") T t = (T) r; |
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return t; |
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} |
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|
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/* ------------- Async task preliminaries -------------- */ |
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|
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/** |
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* A marker interface identifying asynchronous tasks produced by |
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* {@code async} methods. This may be useful for monitoring, |
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* debugging, and tracking asynchronous activities. |
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* |
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* @since 1.8 |
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*/ |
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public static interface AsynchronousCompletionTask { |
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} |
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|
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private static final boolean useCommonPool = |
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(ForkJoinPool.getCommonPoolParallelism() > 1); |
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|
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/** |
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* Default executor -- ForkJoinPool.commonPool() unless it cannot |
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* support parallelism. |
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*/ |
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private static final Executor asyncPool = useCommonPool ? |
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ForkJoinPool.commonPool() : new ThreadPerTaskExecutor(); |
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|
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/** 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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} |
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|
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/** |
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* Null-checks user executor argument, and translates uses of |
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* commonPool to asyncPool in case parallelism disabled. |
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*/ |
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static Executor screenExecutor(Executor e) { |
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if (!useCommonPool && e == ForkJoinPool.commonPool()) |
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return asyncPool; |
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if (e == null) throw new NullPointerException(); |
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return e; |
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} |
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|
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// Modes for Completion.exec. Signedness matters. |
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static final int SYNC = 0; |
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static final int ASYNC = 1; |
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static final int NESTED = -1; |
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|
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/* ------------- Base Completion classes and operations -------------- */ |
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|
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@SuppressWarnings("serial") |
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abstract static class Completion extends ForkJoinTask<Void> |
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implements Runnable, AsynchronousCompletionTask { |
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volatile Completion next; // Treiber stack link |
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|
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/** |
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* Performs completion action if triggered, returning a |
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* dependent that may need propagation, if one exists. |
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* |
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* @param mode SYNC, ASYNC, or NESTED |
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*/ |
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abstract CompletableFuture<?> tryFire(int mode); |
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|
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/** Returns true if possibly still triggerable. Used by cleanStack. */ |
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abstract boolean isLive(); |
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|
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public final void run() { tryFire(ASYNC); } |
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public final boolean exec() { tryFire(ASYNC); return true; } |
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public final Void getRawResult() { return null; } |
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public final void setRawResult(Void v) {} |
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} |
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|
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/** |
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* Pops and tries to trigger all reachable dependents. Call only |
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* when known to be done. |
366 |
*/ |
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final void postComplete() { |
368 |
/* |
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* On each step, variable f holds current dependents to pop |
370 |
* and run. It is extended along only one path at a time, |
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* pushing others to avoid unbounded recursion. |
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*/ |
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CompletableFuture<?> f = this; Completion h; |
374 |
while ((h = f.stack) != null || |
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(f != this && (h = (f = this).stack) != null)) { |
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CompletableFuture<?> d; Completion t; |
377 |
if (f.casStack(h, t = h.next)) { |
378 |
if (t != null) { |
379 |
if (f != this) { // push |
380 |
do {} while (!casStack(h.next = stack, h)); |
381 |
continue; |
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} |
383 |
h.next = null; // detach |
384 |
} |
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f = (d = h.tryFire(NESTED)) == null ? this : d; |
386 |
} |
387 |
} |
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} |
389 |
|
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/** Traverses stack and unlinks dead Completions. */ |
391 |
final void cleanStack() { |
392 |
for (Completion p = null, q = stack; q != null;) { |
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Completion s = q.next; |
394 |
if (q.isLive()) { |
395 |
p = q; |
396 |
q = s; |
397 |
} |
398 |
else if (p == null) { |
399 |
casStack(q, s); |
400 |
q = stack; |
401 |
} |
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else { |
403 |
p.next = s; |
404 |
if (p.isLive()) |
405 |
q = s; |
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else { |
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p = null; // restart |
408 |
q = stack; |
409 |
} |
410 |
} |
411 |
} |
412 |
} |
413 |
|
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/* ------------- One-input Completions -------------- */ |
415 |
|
416 |
/** A Completion with a source, dependent, and executor. */ |
417 |
@SuppressWarnings("serial") |
418 |
abstract static class UniCompletion<T,V> extends Completion { |
419 |
Executor executor; // executor to use (null if none) |
420 |
CompletableFuture<V> dep; // the dependent to complete |
421 |
CompletableFuture<T> src; // source for action |
422 |
|
423 |
UniCompletion(Executor executor, CompletableFuture<V> dep, |
424 |
CompletableFuture<T> src) { |
425 |
this.executor = executor; this.dep = dep; this.src = src; |
426 |
} |
427 |
|
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/** |
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* Returns true if action can be run. Call only when known to |
430 |
* be triggerable. Uses FJ tag bit to ensure that only one |
431 |
* thread claims ownership. If async, starts as task -- a |
432 |
* later call to tryFire will run action. |
433 |
*/ |
434 |
final boolean claim() { |
435 |
Executor e = executor; |
436 |
if (compareAndSetForkJoinTaskTag((short)0, (short)1)) { |
437 |
if (e == null) |
438 |
return true; |
439 |
executor = null; // disable |
440 |
e.execute(this); |
441 |
} |
442 |
return false; |
443 |
} |
444 |
|
445 |
final boolean isLive() { return dep != null; } |
446 |
} |
447 |
|
448 |
/** Pushes the given completion (if it exists) unless done. */ |
449 |
final void push(UniCompletion<?,?> c) { |
450 |
if (c != null) { |
451 |
while (result == null && !casStack(c.next = stack, c)) |
452 |
c.next = null; // clear on failure |
453 |
} |
454 |
} |
455 |
|
456 |
/** |
457 |
* Post-processing by dependent after successful UniCompletion |
458 |
* tryFire. Tries to clean stack of source a, and then either runs |
459 |
* postComplete or returns this to caller, depending on mode. |
460 |
*/ |
461 |
final CompletableFuture<T> postFire(CompletableFuture<?> a, int mode) { |
462 |
if (a != null && a.stack != null) { |
463 |
if (mode < 0 || a.result == null) |
464 |
a.cleanStack(); |
465 |
else |
466 |
a.postComplete(); |
467 |
} |
468 |
if (result != null && stack != null) { |
469 |
if (mode < 0) |
470 |
return this; |
471 |
else |
472 |
postComplete(); |
473 |
} |
474 |
return null; |
475 |
} |
476 |
|
477 |
@SuppressWarnings("serial") |
478 |
static final class UniApply<T,V> extends UniCompletion<T,V> { |
479 |
Function<? super T,? extends V> fn; |
480 |
UniApply(Executor executor, CompletableFuture<V> dep, |
481 |
CompletableFuture<T> src, |
482 |
Function<? super T,? extends V> fn) { |
483 |
super(executor, dep, src); this.fn = fn; |
484 |
} |
485 |
final CompletableFuture<V> tryFire(int mode) { |
486 |
CompletableFuture<V> d; CompletableFuture<T> a; |
487 |
if ((d = dep) == null || |
488 |
!d.uniApply(a = src, fn, mode > 0 ? null : this)) |
489 |
return null; |
490 |
dep = null; src = null; fn = null; |
491 |
return d.postFire(a, mode); |
492 |
} |
493 |
} |
494 |
|
495 |
final <S> boolean uniApply(CompletableFuture<S> a, |
496 |
Function<? super S,? extends T> f, |
497 |
UniApply<S,T> c) { |
498 |
Object r; Throwable x; |
499 |
if (a == null || (r = a.result) == null || f == null) |
500 |
return false; |
501 |
if (result == null) { |
502 |
exceptionalCompletion: try { |
503 |
if (r instanceof AltResult) |
504 |
if ((x = ((AltResult)r).ex) != null) |
505 |
break exceptionalCompletion; |
506 |
else |
507 |
r = null; |
508 |
if (c != null && !c.claim()) |
509 |
return false; |
510 |
@SuppressWarnings("unchecked") S s = (S) r; |
511 |
completeValue(f.apply(s)); |
512 |
return true; |
513 |
} catch (Throwable ex) { |
514 |
x = ex; |
515 |
} |
516 |
completeThrowable(x); |
517 |
} |
518 |
return true; |
519 |
} |
520 |
|
521 |
private <V> CompletableFuture<V> uniApplyStage( |
522 |
Executor e, Function<? super T,? extends V> f) { |
523 |
if (f == null) throw new NullPointerException(); |
524 |
CompletableFuture<V> d = new CompletableFuture<V>(); |
525 |
if (e != null || !d.uniApply(this, f, null)) { |
526 |
UniApply<T,V> c = new UniApply<T,V>(e, d, this, f); |
527 |
push(c); |
528 |
c.tryFire(SYNC); |
529 |
} |
530 |
return d; |
531 |
} |
532 |
|
533 |
@SuppressWarnings("serial") |
534 |
static final class UniAccept<T> extends UniCompletion<T,Void> { |
535 |
Consumer<? super T> fn; |
536 |
UniAccept(Executor executor, CompletableFuture<Void> dep, |
537 |
CompletableFuture<T> src, Consumer<? super T> fn) { |
538 |
super(executor, dep, src); this.fn = fn; |
539 |
} |
540 |
final CompletableFuture<Void> tryFire(int mode) { |
541 |
CompletableFuture<Void> d; CompletableFuture<T> a; |
542 |
if ((d = dep) == null || |
543 |
!d.uniAccept(a = src, fn, mode > 0 ? null : this)) |
544 |
return null; |
545 |
dep = null; src = null; fn = null; |
546 |
return d.postFire(a, mode); |
547 |
} |
548 |
} |
549 |
|
550 |
final <S> boolean uniAccept(CompletableFuture<S> a, |
551 |
Consumer<? super S> f, UniAccept<S> c) { |
552 |
Object r; Throwable x; |
553 |
if (a == null || (r = a.result) == null || f == null) |
554 |
return false; |
555 |
if (result == null) { |
556 |
exceptionalCompletion: try { |
557 |
if (r instanceof AltResult) |
558 |
if ((x = ((AltResult)r).ex) != null) |
559 |
break exceptionalCompletion; |
560 |
else |
561 |
r = null; |
562 |
if (c != null && !c.claim()) |
563 |
return false; |
564 |
@SuppressWarnings("unchecked") S s = (S) r; |
565 |
f.accept(s); |
566 |
completeNil(); |
567 |
return true; |
568 |
} catch (Throwable ex) { |
569 |
x = ex; |
570 |
} |
571 |
completeThrowable(x); |
572 |
} |
573 |
return true; |
574 |
} |
575 |
|
576 |
private CompletableFuture<Void> uniAcceptStage(Executor e, |
577 |
Consumer<? super T> f) { |
578 |
if (f == null) throw new NullPointerException(); |
579 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
580 |
if (e != null || !d.uniAccept(this, f, null)) { |
581 |
UniAccept<T> c = new UniAccept<T>(e, d, this, f); |
582 |
push(c); |
583 |
c.tryFire(SYNC); |
584 |
} |
585 |
return d; |
586 |
} |
587 |
|
588 |
@SuppressWarnings("serial") |
589 |
static final class UniRun<T> extends UniCompletion<T,Void> { |
590 |
Runnable fn; |
591 |
UniRun(Executor executor, CompletableFuture<Void> dep, |
592 |
CompletableFuture<T> src, Runnable fn) { |
593 |
super(executor, dep, src); this.fn = fn; |
594 |
} |
595 |
final CompletableFuture<Void> tryFire(int mode) { |
596 |
CompletableFuture<Void> d; CompletableFuture<T> a; |
597 |
if ((d = dep) == null || |
598 |
!d.uniRun(a = src, fn, mode > 0 ? null : this)) |
599 |
return null; |
600 |
dep = null; src = null; fn = null; |
601 |
return d.postFire(a, mode); |
602 |
} |
603 |
} |
604 |
|
605 |
final boolean uniRun(CompletableFuture<?> a, Runnable f, UniRun<?> c) { |
606 |
Object r; Throwable x; |
607 |
if (a == null || (r = a.result) == null || f == null) |
608 |
return false; |
609 |
if (result == null) { |
610 |
exceptionalCompletion: try { |
611 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) |
612 |
break exceptionalCompletion; |
613 |
if (c != null && !c.claim()) |
614 |
return false; |
615 |
f.run(); |
616 |
completeNil(); |
617 |
return true; |
618 |
} catch (Throwable ex) { |
619 |
x = ex; |
620 |
} |
621 |
completeThrowable(x); |
622 |
} |
623 |
return true; |
624 |
} |
625 |
|
626 |
private CompletableFuture<Void> uniRunStage(Executor e, Runnable f) { |
627 |
if (f == null) throw new NullPointerException(); |
628 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
629 |
if (e != null || !d.uniRun(this, f, null)) { |
630 |
UniRun<T> c = new UniRun<T>(e, d, this, f); |
631 |
push(c); |
632 |
c.tryFire(SYNC); |
633 |
} |
634 |
return d; |
635 |
} |
636 |
|
637 |
@SuppressWarnings("serial") |
638 |
static final class UniWhenComplete<T> extends UniCompletion<T,T> { |
639 |
BiConsumer<? super T, ? super Throwable> fn; |
640 |
UniWhenComplete(Executor executor, CompletableFuture<T> dep, |
641 |
CompletableFuture<T> src, |
642 |
BiConsumer<? super T, ? super Throwable> fn) { |
643 |
super(executor, dep, src); this.fn = fn; |
644 |
} |
645 |
final CompletableFuture<T> tryFire(int mode) { |
646 |
CompletableFuture<T> d; CompletableFuture<T> a; |
647 |
if ((d = dep) == null || |
648 |
!d.uniWhenComplete(a = src, fn, mode > 0 ? null : this)) |
649 |
return null; |
650 |
dep = null; src = null; fn = null; |
651 |
return d.postFire(a, mode); |
652 |
} |
653 |
} |
654 |
|
655 |
final boolean uniWhenComplete(CompletableFuture<T> a, |
656 |
BiConsumer<? super T,? super Throwable> f, |
657 |
UniWhenComplete<T> c) { |
658 |
Object r; T t; Throwable x = null; |
659 |
if (a == null || (r = a.result) == null || f == null) |
660 |
return false; |
661 |
if (result == null) { |
662 |
try { |
663 |
if (c != null && !c.claim()) |
664 |
return false; |
665 |
if (r instanceof AltResult) { |
666 |
x = ((AltResult)r).ex; |
667 |
t = null; |
668 |
} else { |
669 |
@SuppressWarnings("unchecked") T tr = (T) r; |
670 |
t = tr; |
671 |
} |
672 |
f.accept(t, x); |
673 |
if (x == null) { |
674 |
internalComplete(r); |
675 |
return true; |
676 |
} |
677 |
} catch (Throwable ex) { |
678 |
if (x == null) |
679 |
x = ex; |
680 |
} |
681 |
completeThrowable(x); |
682 |
} |
683 |
return true; |
684 |
} |
685 |
|
686 |
private CompletableFuture<T> uniWhenCompleteStage( |
687 |
Executor e, BiConsumer<? super T, ? super Throwable> f) { |
688 |
if (f == null) throw new NullPointerException(); |
689 |
CompletableFuture<T> d = new CompletableFuture<T>(); |
690 |
if (e != null || !d.uniWhenComplete(this, f, null)) { |
691 |
UniWhenComplete<T> c = new UniWhenComplete<T>(e, d, this, f); |
692 |
push(c); |
693 |
c.tryFire(SYNC); |
694 |
} |
695 |
return d; |
696 |
} |
697 |
|
698 |
@SuppressWarnings("serial") |
699 |
static final class UniHandle<T,V> extends UniCompletion<T,V> { |
700 |
BiFunction<? super T, Throwable, ? extends V> fn; |
701 |
UniHandle(Executor executor, CompletableFuture<V> dep, |
702 |
CompletableFuture<T> src, |
703 |
BiFunction<? super T, Throwable, ? extends V> fn) { |
704 |
super(executor, dep, src); this.fn = fn; |
705 |
} |
706 |
final CompletableFuture<V> tryFire(int mode) { |
707 |
CompletableFuture<V> d; CompletableFuture<T> a; |
708 |
if ((d = dep) == null || |
709 |
!d.uniHandle(a = src, fn, mode > 0 ? null : this)) |
710 |
return null; |
711 |
dep = null; src = null; fn = null; |
712 |
return d.postFire(a, mode); |
713 |
} |
714 |
} |
715 |
|
716 |
final <S> boolean uniHandle(CompletableFuture<S> a, |
717 |
BiFunction<? super S, Throwable, ? extends T> f, |
718 |
UniHandle<S,T> c) { |
719 |
Object r; S s; Throwable x; |
720 |
if (a == null || (r = a.result) == null || f == null) |
721 |
return false; |
722 |
if (result == null) { |
723 |
try { |
724 |
if (c != null && !c.claim()) |
725 |
return false; |
726 |
if (r instanceof AltResult) { |
727 |
x = ((AltResult)r).ex; |
728 |
s = null; |
729 |
} else { |
730 |
x = null; |
731 |
@SuppressWarnings("unchecked") S ss = (S) r; |
732 |
s = ss; |
733 |
} |
734 |
completeValue(f.apply(s, x)); |
735 |
} catch (Throwable ex) { |
736 |
completeThrowable(ex); |
737 |
} |
738 |
} |
739 |
return true; |
740 |
} |
741 |
|
742 |
private <V> CompletableFuture<V> uniHandleStage( |
743 |
Executor e, BiFunction<? super T, Throwable, ? extends V> f) { |
744 |
if (f == null) throw new NullPointerException(); |
745 |
CompletableFuture<V> d = new CompletableFuture<V>(); |
746 |
if (e != null || !d.uniHandle(this, f, null)) { |
747 |
UniHandle<T,V> c = new UniHandle<T,V>(e, d, this, f); |
748 |
push(c); |
749 |
c.tryFire(SYNC); |
750 |
} |
751 |
return d; |
752 |
} |
753 |
|
754 |
@SuppressWarnings("serial") |
755 |
static final class UniExceptionally<T> extends UniCompletion<T,T> { |
756 |
Function<? super Throwable, ? extends T> fn; |
757 |
UniExceptionally(CompletableFuture<T> dep, CompletableFuture<T> src, |
758 |
Function<? super Throwable, ? extends T> fn) { |
759 |
super(null, dep, src); this.fn = fn; |
760 |
} |
761 |
final CompletableFuture<T> tryFire(int mode) { // never ASYNC |
762 |
CompletableFuture<T> d; CompletableFuture<T> a; |
763 |
if ((d = dep) == null || !d.uniExceptionally(a = src, fn, this)) |
764 |
return null; |
765 |
dep = null; src = null; fn = null; |
766 |
return d.postFire(a, mode); |
767 |
} |
768 |
} |
769 |
|
770 |
final boolean uniExceptionally(CompletableFuture<T> a, |
771 |
Function<? super Throwable, ? extends T> f, |
772 |
UniExceptionally<T> c) { |
773 |
Object r; Throwable x; |
774 |
if (a == null || (r = a.result) == null || f == null) |
775 |
return false; |
776 |
if (result == null) { |
777 |
try { |
778 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) { |
779 |
if (c != null && !c.claim()) |
780 |
return false; |
781 |
completeValue(f.apply(x)); |
782 |
} else |
783 |
internalComplete(r); |
784 |
} catch (Throwable ex) { |
785 |
completeThrowable(ex); |
786 |
} |
787 |
} |
788 |
return true; |
789 |
} |
790 |
|
791 |
private CompletableFuture<T> uniExceptionallyStage( |
792 |
Function<Throwable, ? extends T> f) { |
793 |
if (f == null) throw new NullPointerException(); |
794 |
CompletableFuture<T> d = new CompletableFuture<T>(); |
795 |
if (!d.uniExceptionally(this, f, null)) { |
796 |
UniExceptionally<T> c = new UniExceptionally<T>(d, this, f); |
797 |
push(c); |
798 |
c.tryFire(SYNC); |
799 |
} |
800 |
return d; |
801 |
} |
802 |
|
803 |
@SuppressWarnings("serial") |
804 |
static final class UniRelay<T> extends UniCompletion<T,T> { // for Compose |
805 |
UniRelay(CompletableFuture<T> dep, CompletableFuture<T> src) { |
806 |
super(null, dep, src); |
807 |
} |
808 |
final CompletableFuture<T> tryFire(int mode) { |
809 |
CompletableFuture<T> d; CompletableFuture<T> a; |
810 |
if ((d = dep) == null || !d.uniRelay(a = src)) |
811 |
return null; |
812 |
src = null; dep = null; |
813 |
return d.postFire(a, mode); |
814 |
} |
815 |
} |
816 |
|
817 |
final boolean uniRelay(CompletableFuture<T> a) { |
818 |
Object r; |
819 |
if (a == null || (r = a.result) == null) |
820 |
return false; |
821 |
if (result == null) // no need to claim |
822 |
completeRelay(r); |
823 |
return true; |
824 |
} |
825 |
|
826 |
@SuppressWarnings("serial") |
827 |
static final class UniCompose<T,V> extends UniCompletion<T,V> { |
828 |
Function<? super T, ? extends CompletionStage<V>> fn; |
829 |
UniCompose(Executor executor, CompletableFuture<V> dep, |
830 |
CompletableFuture<T> src, |
831 |
Function<? super T, ? extends CompletionStage<V>> fn) { |
832 |
super(executor, dep, src); this.fn = fn; |
833 |
} |
834 |
final CompletableFuture<V> tryFire(int mode) { |
835 |
CompletableFuture<V> d; CompletableFuture<T> a; |
836 |
if ((d = dep) == null || |
837 |
!d.uniCompose(a = src, fn, mode > 0 ? null : this)) |
838 |
return null; |
839 |
dep = null; src = null; fn = null; |
840 |
return d.postFire(a, mode); |
841 |
} |
842 |
} |
843 |
|
844 |
final <S> boolean uniCompose( |
845 |
CompletableFuture<S> a, |
846 |
Function<? super S, ? extends CompletionStage<T>> f, |
847 |
UniCompose<S,T> c) { |
848 |
Object r; Throwable x; |
849 |
if (a == null || (r = a.result) == null || f == null) |
850 |
return false; |
851 |
if (result == null) { |
852 |
exceptionalCompletion: try { |
853 |
if (r instanceof AltResult) |
854 |
if ((x = ((AltResult)r).ex) != null) |
855 |
break exceptionalCompletion; |
856 |
else |
857 |
r = null; |
858 |
if (c != null && !c.claim()) |
859 |
return false; |
860 |
@SuppressWarnings("unchecked") S s = (S) r; |
861 |
CompletableFuture<T> g = f.apply(s).toCompletableFuture(); |
862 |
if (g.result == null || !uniRelay(g)) { |
863 |
UniRelay<T> copy = new UniRelay<T>(this, g); |
864 |
g.push(copy); |
865 |
copy.tryFire(SYNC); |
866 |
if (result == null) |
867 |
return false; |
868 |
} |
869 |
return true; |
870 |
} catch (Throwable ex) { |
871 |
x = ex; |
872 |
} |
873 |
completeThrowable(x); |
874 |
} |
875 |
return true; |
876 |
} |
877 |
|
878 |
private <V> CompletableFuture<V> uniComposeStage( |
879 |
Executor e, Function<? super T, ? extends CompletionStage<V>> f) { |
880 |
if (f == null) throw new NullPointerException(); |
881 |
Object r; Throwable x; |
882 |
if (e != null || (r = result) == null) |
883 |
x = null; |
884 |
else { // try to return function result directly |
885 |
exceptionalCompletion: try { |
886 |
if (r instanceof AltResult) |
887 |
if ((x = ((AltResult)r).ex) != null) |
888 |
break exceptionalCompletion; |
889 |
else |
890 |
r = null; |
891 |
@SuppressWarnings("unchecked") T t = (T) r; |
892 |
return f.apply(t).toCompletableFuture(); |
893 |
} catch (Throwable ex) { |
894 |
x = ex; |
895 |
} |
896 |
} |
897 |
CompletableFuture<V> d = new CompletableFuture<V>(); |
898 |
if (x != null) { |
899 |
d.result = encodeThrowable(x); |
900 |
} else { |
901 |
UniCompose<T,V> c = new UniCompose<T,V>(e, d, this, f); |
902 |
push(c); |
903 |
c.tryFire(SYNC); |
904 |
} |
905 |
return d; |
906 |
} |
907 |
|
908 |
/* ------------- Two-input Completions -------------- */ |
909 |
|
910 |
/** A Completion for an action with two sources */ |
911 |
@SuppressWarnings("serial") |
912 |
abstract static class BiCompletion<T,U,V> extends UniCompletion<T,V> { |
913 |
CompletableFuture<U> snd; // second source for action |
914 |
BiCompletion(Executor executor, CompletableFuture<V> dep, |
915 |
CompletableFuture<T> src, CompletableFuture<U> snd) { |
916 |
super(executor, dep, src); this.snd = snd; |
917 |
} |
918 |
} |
919 |
|
920 |
/** A Completion delegating to a BiCompletion */ |
921 |
@SuppressWarnings("serial") |
922 |
static final class CoCompletion extends Completion { |
923 |
BiCompletion<?,?,?> base; |
924 |
CoCompletion(BiCompletion<?,?,?> base) { this.base = base; } |
925 |
final CompletableFuture<?> tryFire(int mode) { |
926 |
BiCompletion<?,?,?> c; CompletableFuture<?> d; |
927 |
if ((c = base) == null || (d = c.tryFire(mode)) == null) |
928 |
return null; |
929 |
base = null; // detach |
930 |
return d; |
931 |
} |
932 |
final boolean isLive() { |
933 |
BiCompletion<?,?,?> c; |
934 |
return (c = base) != null && c.dep != null; |
935 |
} |
936 |
} |
937 |
|
938 |
/** Pushes completion to this and b unless both done. */ |
939 |
final void bipush(CompletableFuture<?> b, BiCompletion<?,?,?> c) { |
940 |
if (c != null) { |
941 |
Object r; |
942 |
while ((r = result) == null && !casStack(c.next = stack, c)) |
943 |
c.next = null; |
944 |
if (b != null && b != this && b.result == null) { |
945 |
Completion q = (r != null) ? c : new CoCompletion(c); |
946 |
while (b.result == null && !b.casStack(q.next = b.stack, q)) |
947 |
q.next = null; |
948 |
} |
949 |
} |
950 |
} |
951 |
|
952 |
/** Post-processing after successful BiCompletion tryFire. */ |
953 |
final CompletableFuture<T> postFire(CompletableFuture<?> a, |
954 |
CompletableFuture<?> b, int mode) { |
955 |
if (b != null && b.stack != null) { // clean second source |
956 |
if (mode < 0 || b.result == null) |
957 |
b.cleanStack(); |
958 |
else |
959 |
b.postComplete(); |
960 |
} |
961 |
return postFire(a, mode); |
962 |
} |
963 |
|
964 |
@SuppressWarnings("serial") |
965 |
static final class BiApply<T,U,V> extends BiCompletion<T,U,V> { |
966 |
BiFunction<? super T,? super U,? extends V> fn; |
967 |
BiApply(Executor executor, CompletableFuture<V> dep, |
968 |
CompletableFuture<T> src, CompletableFuture<U> snd, |
969 |
BiFunction<? super T,? super U,? extends V> fn) { |
970 |
super(executor, dep, src, snd); this.fn = fn; |
971 |
} |
972 |
final CompletableFuture<V> tryFire(int mode) { |
973 |
CompletableFuture<V> d; |
974 |
CompletableFuture<T> a; |
975 |
CompletableFuture<U> b; |
976 |
if ((d = dep) == null || |
977 |
!d.biApply(a = src, b = snd, fn, mode > 0 ? null : this)) |
978 |
return null; |
979 |
dep = null; src = null; snd = null; fn = null; |
980 |
return d.postFire(a, b, mode); |
981 |
} |
982 |
} |
983 |
|
984 |
final <R,S> boolean biApply(CompletableFuture<R> a, |
985 |
CompletableFuture<S> b, |
986 |
BiFunction<? super R,? super S,? extends T> f, |
987 |
BiApply<R,S,T> c) { |
988 |
Object r, s; Throwable x; |
989 |
if (a == null || (r = a.result) == null || |
990 |
b == null || (s = b.result) == null || f == null) |
991 |
return false; |
992 |
if (result == null) { |
993 |
exceptionalCompletion: try { |
994 |
if (r instanceof AltResult) |
995 |
if ((x = ((AltResult)r).ex) != null) |
996 |
break exceptionalCompletion; |
997 |
else |
998 |
r = null; |
999 |
if (s instanceof AltResult) |
1000 |
if ((x = ((AltResult)s).ex) != null) |
1001 |
break exceptionalCompletion; |
1002 |
else |
1003 |
s = null; |
1004 |
if (c != null && !c.claim()) |
1005 |
return false; |
1006 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1007 |
@SuppressWarnings("unchecked") S ss = (S) s; |
1008 |
completeValue(f.apply(rr, ss)); |
1009 |
return true; |
1010 |
} catch (Throwable ex) { |
1011 |
x = ex; |
1012 |
} |
1013 |
completeThrowable(x); |
1014 |
} |
1015 |
return true; |
1016 |
} |
1017 |
|
1018 |
private <U,V> CompletableFuture<V> biApplyStage( |
1019 |
Executor e, CompletionStage<U> o, |
1020 |
BiFunction<? super T,? super U,? extends V> f) { |
1021 |
CompletableFuture<U> b; |
1022 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1023 |
throw new NullPointerException(); |
1024 |
CompletableFuture<V> d = new CompletableFuture<V>(); |
1025 |
if (e != null || !d.biApply(this, b, f, null)) { |
1026 |
BiApply<T,U,V> c = new BiApply<T,U,V>(e, d, this, b, f); |
1027 |
bipush(b, c); |
1028 |
c.tryFire(SYNC); |
1029 |
} |
1030 |
return d; |
1031 |
} |
1032 |
|
1033 |
@SuppressWarnings("serial") |
1034 |
static final class BiAccept<T,U> extends BiCompletion<T,U,Void> { |
1035 |
BiConsumer<? super T,? super U> fn; |
1036 |
BiAccept(Executor executor, CompletableFuture<Void> dep, |
1037 |
CompletableFuture<T> src, CompletableFuture<U> snd, |
1038 |
BiConsumer<? super T,? super U> fn) { |
1039 |
super(executor, dep, src, snd); this.fn = fn; |
1040 |
} |
1041 |
final CompletableFuture<Void> tryFire(int mode) { |
1042 |
CompletableFuture<Void> d; |
1043 |
CompletableFuture<T> a; |
1044 |
CompletableFuture<U> b; |
1045 |
if ((d = dep) == null || |
1046 |
!d.biAccept(a = src, b = snd, fn, mode > 0 ? null : this)) |
1047 |
return null; |
1048 |
dep = null; src = null; snd = null; fn = null; |
1049 |
return d.postFire(a, b, mode); |
1050 |
} |
1051 |
} |
1052 |
|
1053 |
final <R,S> boolean biAccept(CompletableFuture<R> a, |
1054 |
CompletableFuture<S> b, |
1055 |
BiConsumer<? super R,? super S> f, |
1056 |
BiAccept<R,S> c) { |
1057 |
Object r, s; Throwable x; |
1058 |
if (a == null || (r = a.result) == null || |
1059 |
b == null || (s = b.result) == null || f == null) |
1060 |
return false; |
1061 |
if (result == null) { |
1062 |
exceptionalCompletion: try { |
1063 |
if (r instanceof AltResult) |
1064 |
if ((x = ((AltResult)r).ex) != null) |
1065 |
break exceptionalCompletion; |
1066 |
else |
1067 |
r = null; |
1068 |
if (s instanceof AltResult) |
1069 |
if ((x = ((AltResult)s).ex) != null) |
1070 |
break exceptionalCompletion; |
1071 |
else |
1072 |
s = null; |
1073 |
if (c != null && !c.claim()) |
1074 |
return false; |
1075 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1076 |
@SuppressWarnings("unchecked") S ss = (S) s; |
1077 |
f.accept(rr, ss); |
1078 |
completeNil(); |
1079 |
return true; |
1080 |
} catch (Throwable ex) { |
1081 |
x = ex; |
1082 |
} |
1083 |
completeThrowable(x); |
1084 |
} |
1085 |
return true; |
1086 |
} |
1087 |
|
1088 |
private <U> CompletableFuture<Void> biAcceptStage( |
1089 |
Executor e, CompletionStage<U> o, |
1090 |
BiConsumer<? super T,? super U> f) { |
1091 |
CompletableFuture<U> b; |
1092 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1093 |
throw new NullPointerException(); |
1094 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1095 |
if (e != null || !d.biAccept(this, b, f, null)) { |
1096 |
BiAccept<T,U> c = new BiAccept<T,U>(e, d, this, b, f); |
1097 |
bipush(b, c); |
1098 |
c.tryFire(SYNC); |
1099 |
} |
1100 |
return d; |
1101 |
} |
1102 |
|
1103 |
@SuppressWarnings("serial") |
1104 |
static final class BiRun<T,U> extends BiCompletion<T,U,Void> { |
1105 |
Runnable fn; |
1106 |
BiRun(Executor executor, CompletableFuture<Void> dep, |
1107 |
CompletableFuture<T> src, |
1108 |
CompletableFuture<U> snd, |
1109 |
Runnable fn) { |
1110 |
super(executor, dep, src, snd); this.fn = fn; |
1111 |
} |
1112 |
final CompletableFuture<Void> tryFire(int mode) { |
1113 |
CompletableFuture<Void> d; |
1114 |
CompletableFuture<T> a; |
1115 |
CompletableFuture<U> b; |
1116 |
if ((d = dep) == null || |
1117 |
!d.biRun(a = src, b = snd, fn, mode > 0 ? null : this)) |
1118 |
return null; |
1119 |
dep = null; src = null; snd = null; fn = null; |
1120 |
return d.postFire(a, b, mode); |
1121 |
} |
1122 |
} |
1123 |
|
1124 |
final boolean biRun(CompletableFuture<?> a, CompletableFuture<?> b, |
1125 |
Runnable f, BiRun<?,?> c) { |
1126 |
Object r, s; Throwable x; |
1127 |
if (a == null || (r = a.result) == null || |
1128 |
b == null || (s = b.result) == null || f == null) |
1129 |
return false; |
1130 |
if (result == null) { |
1131 |
exceptionalCompletion: try { |
1132 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null || |
1133 |
s instanceof AltResult && (x = ((AltResult)s).ex) != null) |
1134 |
break exceptionalCompletion; |
1135 |
if (c != null && !c.claim()) |
1136 |
return false; |
1137 |
f.run(); |
1138 |
completeNil(); |
1139 |
return true; |
1140 |
} catch (Throwable ex) { |
1141 |
x = ex; |
1142 |
} |
1143 |
completeThrowable(x); |
1144 |
} |
1145 |
return true; |
1146 |
} |
1147 |
|
1148 |
private CompletableFuture<Void> biRunStage(Executor e, CompletionStage<?> o, |
1149 |
Runnable f) { |
1150 |
CompletableFuture<?> b; |
1151 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1152 |
throw new NullPointerException(); |
1153 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1154 |
if (e != null || !d.biRun(this, b, f, null)) { |
1155 |
BiRun<T,?> c = new BiRun<>(e, d, this, b, f); |
1156 |
bipush(b, c); |
1157 |
c.tryFire(SYNC); |
1158 |
} |
1159 |
return d; |
1160 |
} |
1161 |
|
1162 |
@SuppressWarnings("serial") |
1163 |
static final class BiRelay<T,U> extends BiCompletion<T,U,Void> { // for And |
1164 |
BiRelay(CompletableFuture<Void> dep, |
1165 |
CompletableFuture<T> src, |
1166 |
CompletableFuture<U> snd) { |
1167 |
super(null, dep, src, snd); |
1168 |
} |
1169 |
final CompletableFuture<Void> tryFire(int mode) { |
1170 |
CompletableFuture<Void> d; |
1171 |
CompletableFuture<T> a; |
1172 |
CompletableFuture<U> b; |
1173 |
if ((d = dep) == null || !d.biRelay(a = src, b = snd)) |
1174 |
return null; |
1175 |
src = null; snd = null; dep = null; |
1176 |
return d.postFire(a, b, mode); |
1177 |
} |
1178 |
} |
1179 |
|
1180 |
boolean biRelay(CompletableFuture<?> a, CompletableFuture<?> b) { |
1181 |
Object r, s; Throwable x; |
1182 |
if (a == null || (r = a.result) == null || |
1183 |
b == null || (s = b.result) == null) |
1184 |
return false; |
1185 |
if (result == null) { |
1186 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null || |
1187 |
s instanceof AltResult && (x = ((AltResult)s).ex) != null) |
1188 |
completeThrowable(x); |
1189 |
else |
1190 |
completeNil(); |
1191 |
} |
1192 |
return true; |
1193 |
} |
1194 |
|
1195 |
/** Recursively constructs a tree of completions. */ |
1196 |
static CompletableFuture<Void> andTree(CompletableFuture<?>[] cfs, |
1197 |
int lo, int hi) { |
1198 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1199 |
if (lo > hi) // empty |
1200 |
d.result = NIL; |
1201 |
else { |
1202 |
CompletableFuture<?> a, b; |
1203 |
int mid = (lo + hi) >>> 1; |
1204 |
if ((a = (lo == mid ? cfs[lo] : |
1205 |
andTree(cfs, lo, mid))) == null || |
1206 |
(b = (lo == hi ? a : (hi == mid+1) ? cfs[hi] : |
1207 |
andTree(cfs, mid+1, hi))) == null) |
1208 |
throw new NullPointerException(); |
1209 |
if (!d.biRelay(a, b)) { |
1210 |
BiRelay<?,?> c = new BiRelay<>(d, a, b); |
1211 |
a.bipush(b, c); |
1212 |
c.tryFire(SYNC); |
1213 |
} |
1214 |
} |
1215 |
return d; |
1216 |
} |
1217 |
|
1218 |
/* ------------- Projected (Ored) BiCompletions -------------- */ |
1219 |
|
1220 |
/** Pushes completion to this and b unless either done. */ |
1221 |
final void orpush(CompletableFuture<?> b, BiCompletion<?,?,?> c) { |
1222 |
if (c != null) { |
1223 |
while ((b == null || b.result == null) && result == null) { |
1224 |
if (casStack(c.next = stack, c)) { |
1225 |
if (b != null && b != this && b.result == null) { |
1226 |
Completion q = new CoCompletion(c); |
1227 |
while (result == null && b.result == null && |
1228 |
!b.casStack(q.next = b.stack, q)) |
1229 |
q.next = null; |
1230 |
} |
1231 |
break; |
1232 |
} |
1233 |
c.next = null; |
1234 |
} |
1235 |
} |
1236 |
} |
1237 |
|
1238 |
@SuppressWarnings("serial") |
1239 |
static final class OrApply<T,U extends T,V> extends BiCompletion<T,U,V> { |
1240 |
Function<? super T,? extends V> fn; |
1241 |
OrApply(Executor executor, CompletableFuture<V> dep, |
1242 |
CompletableFuture<T> src, |
1243 |
CompletableFuture<U> snd, |
1244 |
Function<? super T,? extends V> fn) { |
1245 |
super(executor, dep, src, snd); this.fn = fn; |
1246 |
} |
1247 |
final CompletableFuture<V> tryFire(int mode) { |
1248 |
CompletableFuture<V> d; |
1249 |
CompletableFuture<T> a; |
1250 |
CompletableFuture<U> b; |
1251 |
if ((d = dep) == null || |
1252 |
!d.orApply(a = src, b = snd, fn, mode > 0 ? null : this)) |
1253 |
return null; |
1254 |
dep = null; src = null; snd = null; fn = null; |
1255 |
return d.postFire(a, b, mode); |
1256 |
} |
1257 |
} |
1258 |
|
1259 |
final <R,S extends R> boolean orApply(CompletableFuture<R> a, |
1260 |
CompletableFuture<S> b, |
1261 |
Function<? super R, ? extends T> f, |
1262 |
OrApply<R,S,T> c) { |
1263 |
Object r; Throwable x; |
1264 |
if (a == null || b == null || |
1265 |
((r = a.result) == null && (r = b.result) == null) || f == null) |
1266 |
return false; |
1267 |
if (result == null) { |
1268 |
exceptionalCompletion: try { |
1269 |
if (c != null && !c.claim()) |
1270 |
return false; |
1271 |
if (r instanceof AltResult) |
1272 |
if ((x = ((AltResult)r).ex) != null) |
1273 |
break exceptionalCompletion; |
1274 |
else |
1275 |
r = null; |
1276 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1277 |
completeValue(f.apply(rr)); |
1278 |
return true; |
1279 |
} catch (Throwable ex) { |
1280 |
x = ex; |
1281 |
} |
1282 |
completeThrowable(x); |
1283 |
} |
1284 |
return true; |
1285 |
} |
1286 |
|
1287 |
private <U extends T,V> CompletableFuture<V> orApplyStage( |
1288 |
Executor e, CompletionStage<U> o, |
1289 |
Function<? super T, ? extends V> f) { |
1290 |
CompletableFuture<U> b; |
1291 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1292 |
throw new NullPointerException(); |
1293 |
CompletableFuture<V> d = new CompletableFuture<V>(); |
1294 |
if (e != null || !d.orApply(this, b, f, null)) { |
1295 |
OrApply<T,U,V> c = new OrApply<T,U,V>(e, d, this, b, f); |
1296 |
orpush(b, c); |
1297 |
c.tryFire(SYNC); |
1298 |
} |
1299 |
return d; |
1300 |
} |
1301 |
|
1302 |
@SuppressWarnings("serial") |
1303 |
static final class OrAccept<T,U extends T> extends BiCompletion<T,U,Void> { |
1304 |
Consumer<? super T> fn; |
1305 |
OrAccept(Executor executor, CompletableFuture<Void> dep, |
1306 |
CompletableFuture<T> src, |
1307 |
CompletableFuture<U> snd, |
1308 |
Consumer<? super T> fn) { |
1309 |
super(executor, dep, src, snd); this.fn = fn; |
1310 |
} |
1311 |
final CompletableFuture<Void> tryFire(int mode) { |
1312 |
CompletableFuture<Void> d; |
1313 |
CompletableFuture<T> a; |
1314 |
CompletableFuture<U> b; |
1315 |
if ((d = dep) == null || |
1316 |
!d.orAccept(a = src, b = snd, fn, mode > 0 ? null : this)) |
1317 |
return null; |
1318 |
dep = null; src = null; snd = null; fn = null; |
1319 |
return d.postFire(a, b, mode); |
1320 |
} |
1321 |
} |
1322 |
|
1323 |
final <R,S extends R> boolean orAccept(CompletableFuture<R> a, |
1324 |
CompletableFuture<S> b, |
1325 |
Consumer<? super R> f, |
1326 |
OrAccept<R,S> c) { |
1327 |
Object r; Throwable x; |
1328 |
if (a == null || b == null || |
1329 |
((r = a.result) == null && (r = b.result) == null) || f == null) |
1330 |
return false; |
1331 |
if (result == null) { |
1332 |
exceptionalCompletion: try { |
1333 |
if (c != null && !c.claim()) |
1334 |
return false; |
1335 |
if (r instanceof AltResult) |
1336 |
if ((x = ((AltResult)r).ex) != null) |
1337 |
break exceptionalCompletion; |
1338 |
else |
1339 |
r = null; |
1340 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1341 |
f.accept(rr); |
1342 |
completeNil(); |
1343 |
return true; |
1344 |
} catch (Throwable ex) { |
1345 |
x = ex; |
1346 |
} |
1347 |
completeThrowable(x); |
1348 |
} |
1349 |
return true; |
1350 |
} |
1351 |
|
1352 |
private <U extends T> CompletableFuture<Void> orAcceptStage( |
1353 |
Executor e, CompletionStage<U> o, Consumer<? super T> f) { |
1354 |
CompletableFuture<U> b; |
1355 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1356 |
throw new NullPointerException(); |
1357 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1358 |
if (e != null || !d.orAccept(this, b, f, null)) { |
1359 |
OrAccept<T,U> c = new OrAccept<T,U>(e, d, this, b, f); |
1360 |
orpush(b, c); |
1361 |
c.tryFire(SYNC); |
1362 |
} |
1363 |
return d; |
1364 |
} |
1365 |
|
1366 |
@SuppressWarnings("serial") |
1367 |
static final class OrRun<T,U> extends BiCompletion<T,U,Void> { |
1368 |
Runnable fn; |
1369 |
OrRun(Executor executor, CompletableFuture<Void> dep, |
1370 |
CompletableFuture<T> src, |
1371 |
CompletableFuture<U> snd, |
1372 |
Runnable fn) { |
1373 |
super(executor, dep, src, snd); this.fn = fn; |
1374 |
} |
1375 |
final CompletableFuture<Void> tryFire(int mode) { |
1376 |
CompletableFuture<Void> d; |
1377 |
CompletableFuture<T> a; |
1378 |
CompletableFuture<U> b; |
1379 |
if ((d = dep) == null || |
1380 |
!d.orRun(a = src, b = snd, fn, mode > 0 ? null : this)) |
1381 |
return null; |
1382 |
dep = null; src = null; snd = null; fn = null; |
1383 |
return d.postFire(a, b, mode); |
1384 |
} |
1385 |
} |
1386 |
|
1387 |
final boolean orRun(CompletableFuture<?> a, CompletableFuture<?> b, |
1388 |
Runnable f, OrRun<?,?> c) { |
1389 |
Object r; Throwable x; |
1390 |
if (a == null || b == null || |
1391 |
((r = a.result) == null && (r = b.result) == null) || f == null) |
1392 |
return false; |
1393 |
if (result == null) { |
1394 |
exceptionalCompletion: try { |
1395 |
if (c != null && !c.claim()) |
1396 |
return false; |
1397 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) |
1398 |
break exceptionalCompletion; |
1399 |
f.run(); |
1400 |
completeNil(); |
1401 |
return true; |
1402 |
} catch (Throwable ex) { |
1403 |
x = ex; |
1404 |
} |
1405 |
completeThrowable(x); |
1406 |
} |
1407 |
return true; |
1408 |
} |
1409 |
|
1410 |
private CompletableFuture<Void> orRunStage(Executor e, CompletionStage<?> o, |
1411 |
Runnable f) { |
1412 |
CompletableFuture<?> b; |
1413 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1414 |
throw new NullPointerException(); |
1415 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1416 |
if (e != null || !d.orRun(this, b, f, null)) { |
1417 |
OrRun<T,?> c = new OrRun<>(e, d, this, b, f); |
1418 |
orpush(b, c); |
1419 |
c.tryFire(SYNC); |
1420 |
} |
1421 |
return d; |
1422 |
} |
1423 |
|
1424 |
@SuppressWarnings("serial") |
1425 |
static final class OrRelay<T,U> extends BiCompletion<T,U,Object> { // for Or |
1426 |
OrRelay(CompletableFuture<Object> dep, CompletableFuture<T> src, |
1427 |
CompletableFuture<U> snd) { |
1428 |
super(null, dep, src, snd); |
1429 |
} |
1430 |
final CompletableFuture<Object> tryFire(int mode) { |
1431 |
CompletableFuture<Object> d; |
1432 |
CompletableFuture<T> a; |
1433 |
CompletableFuture<U> b; |
1434 |
if ((d = dep) == null || !d.orRelay(a = src, b = snd)) |
1435 |
return null; |
1436 |
src = null; snd = null; dep = null; |
1437 |
return d.postFire(a, b, mode); |
1438 |
} |
1439 |
} |
1440 |
|
1441 |
final boolean orRelay(CompletableFuture<?> a, CompletableFuture<?> b) { |
1442 |
Object r; |
1443 |
if (a == null || b == null || |
1444 |
((r = a.result) == null && (r = b.result) == null)) |
1445 |
return false; |
1446 |
if (result == null) |
1447 |
completeRelay(r); |
1448 |
return true; |
1449 |
} |
1450 |
|
1451 |
/** Recursively constructs a tree of completions. */ |
1452 |
static CompletableFuture<Object> orTree(CompletableFuture<?>[] cfs, |
1453 |
int lo, int hi) { |
1454 |
CompletableFuture<Object> d = new CompletableFuture<Object>(); |
1455 |
if (lo <= hi) { |
1456 |
CompletableFuture<?> a, b; |
1457 |
int mid = (lo + hi) >>> 1; |
1458 |
if ((a = (lo == mid ? cfs[lo] : |
1459 |
orTree(cfs, lo, mid))) == null || |
1460 |
(b = (lo == hi ? a : (hi == mid+1) ? cfs[hi] : |
1461 |
orTree(cfs, mid+1, hi))) == null) |
1462 |
throw new NullPointerException(); |
1463 |
if (!d.orRelay(a, b)) { |
1464 |
OrRelay<?,?> c = new OrRelay<>(d, a, b); |
1465 |
a.orpush(b, c); |
1466 |
c.tryFire(SYNC); |
1467 |
} |
1468 |
} |
1469 |
return d; |
1470 |
} |
1471 |
|
1472 |
/* ------------- Zero-input Async forms -------------- */ |
1473 |
|
1474 |
@SuppressWarnings("serial") |
1475 |
static final class AsyncSupply<T> extends Completion { |
1476 |
CompletableFuture<T> dep; Supplier<T> fn; |
1477 |
AsyncSupply(CompletableFuture<T> dep, Supplier<T> fn) { |
1478 |
this.dep = dep; this.fn = fn; |
1479 |
} |
1480 |
|
1481 |
final CompletableFuture<T> tryFire(int alwaysAsync) { |
1482 |
CompletableFuture<T> d; Supplier<T> f; |
1483 |
if ((d = dep) != null && (f = fn) != null) { |
1484 |
dep = null; fn = null; |
1485 |
if (d.result == null) { |
1486 |
try { |
1487 |
d.completeValue(f.get()); |
1488 |
} catch (Throwable ex) { |
1489 |
d.completeThrowable(ex); |
1490 |
} |
1491 |
} |
1492 |
d.postComplete(); |
1493 |
} |
1494 |
return d; |
1495 |
} |
1496 |
final boolean isLive() { return dep != null; } |
1497 |
} |
1498 |
|
1499 |
static <U> CompletableFuture<U> asyncSupplyStage(Executor e, |
1500 |
Supplier<U> f) { |
1501 |
if (f == null) throw new NullPointerException(); |
1502 |
CompletableFuture<U> d = new CompletableFuture<U>(); |
1503 |
e.execute(new AsyncSupply<U>(d, f)); |
1504 |
return d; |
1505 |
} |
1506 |
|
1507 |
@SuppressWarnings("serial") |
1508 |
static final class AsyncRun extends Completion { |
1509 |
CompletableFuture<Void> dep; Runnable fn; |
1510 |
AsyncRun(CompletableFuture<Void> dep, Runnable fn) { |
1511 |
this.dep = dep; this.fn = fn; |
1512 |
} |
1513 |
|
1514 |
final CompletableFuture<Void> tryFire(int alwaysAsync) { |
1515 |
CompletableFuture<Void> d; Runnable f; |
1516 |
if ((d = dep) != null && (f = fn) != null) { |
1517 |
dep = null; fn = null; |
1518 |
if (d.result == null) { |
1519 |
try { |
1520 |
f.run(); |
1521 |
d.completeNil(); |
1522 |
} catch (Throwable ex) { |
1523 |
d.completeThrowable(ex); |
1524 |
} |
1525 |
} |
1526 |
d.postComplete(); |
1527 |
} |
1528 |
return d; |
1529 |
} |
1530 |
final boolean isLive() { return dep != null; } |
1531 |
} |
1532 |
|
1533 |
static CompletableFuture<Void> asyncRunStage(Executor e, Runnable f) { |
1534 |
if (f == null) throw new NullPointerException(); |
1535 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1536 |
e.execute(new AsyncRun(d, f)); |
1537 |
return d; |
1538 |
} |
1539 |
|
1540 |
/* ------------- Signallers -------------- */ |
1541 |
|
1542 |
/** |
1543 |
* Completion for recording and releasing a waiting thread. This |
1544 |
* class implements ManagedBlocker to avoid starvation when |
1545 |
* blocking actions pile up in ForkJoinPools. |
1546 |
*/ |
1547 |
@SuppressWarnings("serial") |
1548 |
static final class Signaller extends Completion |
1549 |
implements ForkJoinPool.ManagedBlocker { |
1550 |
long nanos; // wait time if timed |
1551 |
final long deadline; // non-zero if timed |
1552 |
volatile int interruptControl; // > 0: interruptible, < 0: interrupted |
1553 |
volatile Thread thread; |
1554 |
|
1555 |
Signaller(boolean interruptible, long nanos, long deadline) { |
1556 |
this.thread = Thread.currentThread(); |
1557 |
this.interruptControl = interruptible ? 1 : 0; |
1558 |
this.nanos = nanos; |
1559 |
this.deadline = deadline; |
1560 |
} |
1561 |
final CompletableFuture<?> tryFire(int ignore) { |
1562 |
Thread w; // no need to atomically claim |
1563 |
if ((w = thread) != null) { |
1564 |
thread = null; |
1565 |
LockSupport.unpark(w); |
1566 |
} |
1567 |
return null; |
1568 |
} |
1569 |
public boolean isReleasable() { |
1570 |
if (thread == null) |
1571 |
return true; |
1572 |
if (Thread.interrupted()) { |
1573 |
int i = interruptControl; |
1574 |
interruptControl = -1; |
1575 |
if (i > 0) |
1576 |
return true; |
1577 |
} |
1578 |
if (deadline != 0L && |
1579 |
(nanos <= 0L || (nanos = deadline - System.nanoTime()) <= 0L)) { |
1580 |
thread = null; |
1581 |
return true; |
1582 |
} |
1583 |
return false; |
1584 |
} |
1585 |
public boolean block() { |
1586 |
if (isReleasable()) |
1587 |
return true; |
1588 |
else if (deadline == 0L) |
1589 |
LockSupport.park(this); |
1590 |
else if (nanos > 0L) |
1591 |
LockSupport.parkNanos(this, nanos); |
1592 |
return isReleasable(); |
1593 |
} |
1594 |
final boolean isLive() { return thread != null; } |
1595 |
} |
1596 |
|
1597 |
/** |
1598 |
* Returns raw result after waiting, or null if interruptible and |
1599 |
* interrupted. |
1600 |
*/ |
1601 |
private Object waitingGet(boolean interruptible) { |
1602 |
Signaller q = null; |
1603 |
boolean queued = false; |
1604 |
int spins = -1; |
1605 |
Object r; |
1606 |
while ((r = result) == null) { |
1607 |
if (spins < 0) |
1608 |
spins = (Runtime.getRuntime().availableProcessors() > 1) ? |
1609 |
1 << 8 : 0; // Use brief spin-wait on multiprocessors |
1610 |
else if (spins > 0) { |
1611 |
if (ThreadLocalRandom.nextSecondarySeed() >= 0) |
1612 |
--spins; |
1613 |
} |
1614 |
else if (q == null) |
1615 |
q = new Signaller(interruptible, 0L, 0L); |
1616 |
else if (!queued) |
1617 |
queued = casStack(q.next = stack, q); |
1618 |
else if (interruptible && q.interruptControl < 0) { |
1619 |
q.thread = null; |
1620 |
cleanStack(); |
1621 |
return null; |
1622 |
} |
1623 |
else if (q.thread != null && result == null) { |
1624 |
try { |
1625 |
ForkJoinPool.managedBlock(q); |
1626 |
} catch (InterruptedException ie) { |
1627 |
q.interruptControl = -1; |
1628 |
} |
1629 |
} |
1630 |
} |
1631 |
if (q != null) { |
1632 |
q.thread = null; |
1633 |
if (q.interruptControl < 0) { |
1634 |
if (interruptible) |
1635 |
r = null; // report interruption |
1636 |
else |
1637 |
Thread.currentThread().interrupt(); |
1638 |
} |
1639 |
} |
1640 |
postComplete(); |
1641 |
return r; |
1642 |
} |
1643 |
|
1644 |
/** |
1645 |
* Returns raw result after waiting, or null if interrupted, or |
1646 |
* throws TimeoutException on timeout. |
1647 |
*/ |
1648 |
private Object timedGet(long nanos) throws TimeoutException { |
1649 |
if (Thread.interrupted()) |
1650 |
return null; |
1651 |
if (nanos <= 0L) |
1652 |
throw new TimeoutException(); |
1653 |
long d = System.nanoTime() + nanos; |
1654 |
Signaller q = new Signaller(true, nanos, d == 0L ? 1L : d); // avoid 0 |
1655 |
boolean queued = false; |
1656 |
Object r; |
1657 |
while ((r = result) == null) { |
1658 |
if (!queued) |
1659 |
queued = casStack(q.next = stack, q); |
1660 |
else if (q.interruptControl < 0 || q.nanos <= 0L) { |
1661 |
q.thread = null; |
1662 |
cleanStack(); |
1663 |
if (q.interruptControl < 0) |
1664 |
return null; |
1665 |
throw new TimeoutException(); |
1666 |
} |
1667 |
else if (q.thread != null && result == null) { |
1668 |
try { |
1669 |
ForkJoinPool.managedBlock(q); |
1670 |
} catch (InterruptedException ie) { |
1671 |
q.interruptControl = -1; |
1672 |
} |
1673 |
} |
1674 |
} |
1675 |
if (q.interruptControl < 0) |
1676 |
r = null; |
1677 |
q.thread = null; |
1678 |
postComplete(); |
1679 |
return r; |
1680 |
} |
1681 |
|
1682 |
/* ------------- public methods -------------- */ |
1683 |
|
1684 |
/** |
1685 |
* Creates a new incomplete CompletableFuture. |
1686 |
*/ |
1687 |
public CompletableFuture() { |
1688 |
} |
1689 |
|
1690 |
/** |
1691 |
* Returns a new CompletableFuture that is asynchronously completed |
1692 |
* by a task running in the {@link ForkJoinPool#commonPool()} with |
1693 |
* the value obtained by calling the given Supplier. |
1694 |
* |
1695 |
* @param supplier a function returning the value to be used |
1696 |
* to complete the returned CompletableFuture |
1697 |
* @param <U> the function's return type |
1698 |
* @return the new CompletableFuture |
1699 |
*/ |
1700 |
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier) { |
1701 |
return asyncSupplyStage(asyncPool, supplier); |
1702 |
} |
1703 |
|
1704 |
/** |
1705 |
* Returns a new CompletableFuture that is asynchronously completed |
1706 |
* by a task running in the given executor with the value obtained |
1707 |
* by calling the given Supplier. |
1708 |
* |
1709 |
* @param supplier a function returning the value to be used |
1710 |
* to complete the returned CompletableFuture |
1711 |
* @param executor the executor to use for asynchronous execution |
1712 |
* @param <U> the function's return type |
1713 |
* @return the new CompletableFuture |
1714 |
*/ |
1715 |
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier, |
1716 |
Executor executor) { |
1717 |
return asyncSupplyStage(screenExecutor(executor), supplier); |
1718 |
} |
1719 |
|
1720 |
/** |
1721 |
* Returns a new CompletableFuture that is asynchronously completed |
1722 |
* by a task running in the {@link ForkJoinPool#commonPool()} after |
1723 |
* it runs the given action. |
1724 |
* |
1725 |
* @param runnable the action to run before completing the |
1726 |
* returned CompletableFuture |
1727 |
* @return the new CompletableFuture |
1728 |
*/ |
1729 |
public static CompletableFuture<Void> runAsync(Runnable runnable) { |
1730 |
return asyncRunStage(asyncPool, runnable); |
1731 |
} |
1732 |
|
1733 |
/** |
1734 |
* Returns a new CompletableFuture that is asynchronously completed |
1735 |
* by a task running in the given executor after it runs the given |
1736 |
* action. |
1737 |
* |
1738 |
* @param runnable the action to run before completing the |
1739 |
* returned CompletableFuture |
1740 |
* @param executor the executor to use for asynchronous execution |
1741 |
* @return the new CompletableFuture |
1742 |
*/ |
1743 |
public static CompletableFuture<Void> runAsync(Runnable runnable, |
1744 |
Executor executor) { |
1745 |
return asyncRunStage(screenExecutor(executor), runnable); |
1746 |
} |
1747 |
|
1748 |
/** |
1749 |
* Returns a new CompletableFuture that is already completed with |
1750 |
* the given value. |
1751 |
* |
1752 |
* @param value the value |
1753 |
* @param <U> the type of the value |
1754 |
* @return the completed CompletableFuture |
1755 |
*/ |
1756 |
public static <U> CompletableFuture<U> completedFuture(U value) { |
1757 |
CompletableFuture<U> d = new CompletableFuture<U>(); |
1758 |
d.result = (value == null) ? NIL : value; |
1759 |
return d; |
1760 |
} |
1761 |
|
1762 |
/** |
1763 |
* Returns {@code true} if completed in any fashion: normally, |
1764 |
* exceptionally, or via cancellation. |
1765 |
* |
1766 |
* @return {@code true} if completed |
1767 |
*/ |
1768 |
public boolean isDone() { |
1769 |
return result != null; |
1770 |
} |
1771 |
|
1772 |
/** |
1773 |
* Waits if necessary for this future to complete, and then |
1774 |
* returns its result. |
1775 |
* |
1776 |
* @return the result value |
1777 |
* @throws CancellationException if this future was cancelled |
1778 |
* @throws ExecutionException if this future completed exceptionally |
1779 |
* @throws InterruptedException if the current thread was interrupted |
1780 |
* while waiting |
1781 |
*/ |
1782 |
public T get() throws InterruptedException, ExecutionException { |
1783 |
Object r; |
1784 |
return reportGet((r = result) == null ? waitingGet(true) : r); |
1785 |
} |
1786 |
|
1787 |
/** |
1788 |
* Waits if necessary for at most the given time for this future |
1789 |
* to complete, and then returns its result, if available. |
1790 |
* |
1791 |
* @param timeout the maximum time to wait |
1792 |
* @param unit the time unit of the timeout argument |
1793 |
* @return the result value |
1794 |
* @throws CancellationException if this future was cancelled |
1795 |
* @throws ExecutionException if this future completed exceptionally |
1796 |
* @throws InterruptedException if the current thread was interrupted |
1797 |
* while waiting |
1798 |
* @throws TimeoutException if the wait timed out |
1799 |
*/ |
1800 |
public T get(long timeout, TimeUnit unit) |
1801 |
throws InterruptedException, ExecutionException, TimeoutException { |
1802 |
Object r; |
1803 |
long nanos = unit.toNanos(timeout); |
1804 |
return reportGet((r = result) == null ? timedGet(nanos) : r); |
1805 |
} |
1806 |
|
1807 |
/** |
1808 |
* Returns the result value when complete, or throws an |
1809 |
* (unchecked) exception if completed exceptionally. To better |
1810 |
* conform with the use of common functional forms, if a |
1811 |
* computation involved in the completion of this |
1812 |
* CompletableFuture threw an exception, this method throws an |
1813 |
* (unchecked) {@link CompletionException} with the underlying |
1814 |
* exception as its cause. |
1815 |
* |
1816 |
* @return the result value |
1817 |
* @throws CancellationException if the computation was cancelled |
1818 |
* @throws CompletionException if this future completed |
1819 |
* exceptionally or a completion computation threw an exception |
1820 |
*/ |
1821 |
public T join() { |
1822 |
Object r; |
1823 |
return reportJoin((r = result) == null ? waitingGet(false) : r); |
1824 |
} |
1825 |
|
1826 |
/** |
1827 |
* Returns the result value (or throws any encountered exception) |
1828 |
* if completed, else returns the given valueIfAbsent. |
1829 |
* |
1830 |
* @param valueIfAbsent the value to return if not completed |
1831 |
* @return the result value, if completed, else the given valueIfAbsent |
1832 |
* @throws CancellationException if the computation was cancelled |
1833 |
* @throws CompletionException if this future completed |
1834 |
* exceptionally or a completion computation threw an exception |
1835 |
*/ |
1836 |
public T getNow(T valueIfAbsent) { |
1837 |
Object r; |
1838 |
return ((r = result) == null) ? valueIfAbsent : reportJoin(r); |
1839 |
} |
1840 |
|
1841 |
/** |
1842 |
* If not already completed, sets the value returned by {@link |
1843 |
* #get()} and related methods to the given value. |
1844 |
* |
1845 |
* @param value the result value |
1846 |
* @return {@code true} if this invocation caused this CompletableFuture |
1847 |
* to transition to a completed state, else {@code false} |
1848 |
*/ |
1849 |
public boolean complete(T value) { |
1850 |
boolean triggered = completeValue(value); |
1851 |
postComplete(); |
1852 |
return triggered; |
1853 |
} |
1854 |
|
1855 |
/** |
1856 |
* If not already completed, causes invocations of {@link #get()} |
1857 |
* and related methods to throw the given exception. |
1858 |
* |
1859 |
* @param ex the exception |
1860 |
* @return {@code true} if this invocation caused this CompletableFuture |
1861 |
* to transition to a completed state, else {@code false} |
1862 |
*/ |
1863 |
public boolean completeExceptionally(Throwable ex) { |
1864 |
if (ex == null) throw new NullPointerException(); |
1865 |
boolean triggered = internalComplete(new AltResult(ex)); |
1866 |
postComplete(); |
1867 |
return triggered; |
1868 |
} |
1869 |
|
1870 |
public <U> CompletableFuture<U> thenApply( |
1871 |
Function<? super T,? extends U> fn) { |
1872 |
return uniApplyStage(null, fn); |
1873 |
} |
1874 |
|
1875 |
public <U> CompletableFuture<U> thenApplyAsync( |
1876 |
Function<? super T,? extends U> fn) { |
1877 |
return uniApplyStage(asyncPool, fn); |
1878 |
} |
1879 |
|
1880 |
public <U> CompletableFuture<U> thenApplyAsync( |
1881 |
Function<? super T,? extends U> fn, Executor executor) { |
1882 |
return uniApplyStage(screenExecutor(executor), fn); |
1883 |
} |
1884 |
|
1885 |
public CompletableFuture<Void> thenAccept(Consumer<? super T> action) { |
1886 |
return uniAcceptStage(null, action); |
1887 |
} |
1888 |
|
1889 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> action) { |
1890 |
return uniAcceptStage(asyncPool, action); |
1891 |
} |
1892 |
|
1893 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> action, |
1894 |
Executor executor) { |
1895 |
return uniAcceptStage(screenExecutor(executor), action); |
1896 |
} |
1897 |
|
1898 |
public CompletableFuture<Void> thenRun(Runnable action) { |
1899 |
return uniRunStage(null, action); |
1900 |
} |
1901 |
|
1902 |
public CompletableFuture<Void> thenRunAsync(Runnable action) { |
1903 |
return uniRunStage(asyncPool, action); |
1904 |
} |
1905 |
|
1906 |
public CompletableFuture<Void> thenRunAsync(Runnable action, |
1907 |
Executor executor) { |
1908 |
return uniRunStage(screenExecutor(executor), action); |
1909 |
} |
1910 |
|
1911 |
public <U,V> CompletableFuture<V> thenCombine( |
1912 |
CompletionStage<? extends U> other, |
1913 |
BiFunction<? super T,? super U,? extends V> fn) { |
1914 |
return biApplyStage(null, other, fn); |
1915 |
} |
1916 |
|
1917 |
public <U,V> CompletableFuture<V> thenCombineAsync( |
1918 |
CompletionStage<? extends U> other, |
1919 |
BiFunction<? super T,? super U,? extends V> fn) { |
1920 |
return biApplyStage(asyncPool, other, fn); |
1921 |
} |
1922 |
|
1923 |
public <U,V> CompletableFuture<V> thenCombineAsync( |
1924 |
CompletionStage<? extends U> other, |
1925 |
BiFunction<? super T,? super U,? extends V> fn, Executor executor) { |
1926 |
return biApplyStage(screenExecutor(executor), other, fn); |
1927 |
} |
1928 |
|
1929 |
public <U> CompletableFuture<Void> thenAcceptBoth( |
1930 |
CompletionStage<? extends U> other, |
1931 |
BiConsumer<? super T, ? super U> action) { |
1932 |
return biAcceptStage(null, other, action); |
1933 |
} |
1934 |
|
1935 |
public <U> CompletableFuture<Void> thenAcceptBothAsync( |
1936 |
CompletionStage<? extends U> other, |
1937 |
BiConsumer<? super T, ? super U> action) { |
1938 |
return biAcceptStage(asyncPool, other, action); |
1939 |
} |
1940 |
|
1941 |
public <U> CompletableFuture<Void> thenAcceptBothAsync( |
1942 |
CompletionStage<? extends U> other, |
1943 |
BiConsumer<? super T, ? super U> action, Executor executor) { |
1944 |
return biAcceptStage(screenExecutor(executor), other, action); |
1945 |
} |
1946 |
|
1947 |
public CompletableFuture<Void> runAfterBoth(CompletionStage<?> other, |
1948 |
Runnable action) { |
1949 |
return biRunStage(null, other, action); |
1950 |
} |
1951 |
|
1952 |
public CompletableFuture<Void> runAfterBothAsync(CompletionStage<?> other, |
1953 |
Runnable action) { |
1954 |
return biRunStage(asyncPool, other, action); |
1955 |
} |
1956 |
|
1957 |
public CompletableFuture<Void> runAfterBothAsync(CompletionStage<?> other, |
1958 |
Runnable action, |
1959 |
Executor executor) { |
1960 |
return biRunStage(screenExecutor(executor), other, action); |
1961 |
} |
1962 |
|
1963 |
public <U> CompletableFuture<U> applyToEither( |
1964 |
CompletionStage<? extends T> other, Function<? super T, U> fn) { |
1965 |
return orApplyStage(null, other, fn); |
1966 |
} |
1967 |
|
1968 |
public <U> CompletableFuture<U> applyToEitherAsync( |
1969 |
CompletionStage<? extends T> other, Function<? super T, U> fn) { |
1970 |
return orApplyStage(asyncPool, other, fn); |
1971 |
} |
1972 |
|
1973 |
public <U> CompletableFuture<U> applyToEitherAsync( |
1974 |
CompletionStage<? extends T> other, Function<? super T, U> fn, |
1975 |
Executor executor) { |
1976 |
return orApplyStage(screenExecutor(executor), other, fn); |
1977 |
} |
1978 |
|
1979 |
public CompletableFuture<Void> acceptEither( |
1980 |
CompletionStage<? extends T> other, Consumer<? super T> action) { |
1981 |
return orAcceptStage(null, other, action); |
1982 |
} |
1983 |
|
1984 |
public CompletableFuture<Void> acceptEitherAsync( |
1985 |
CompletionStage<? extends T> other, Consumer<? super T> action) { |
1986 |
return orAcceptStage(asyncPool, other, action); |
1987 |
} |
1988 |
|
1989 |
public CompletableFuture<Void> acceptEitherAsync( |
1990 |
CompletionStage<? extends T> other, Consumer<? super T> action, |
1991 |
Executor executor) { |
1992 |
return orAcceptStage(screenExecutor(executor), other, action); |
1993 |
} |
1994 |
|
1995 |
public CompletableFuture<Void> runAfterEither(CompletionStage<?> other, |
1996 |
Runnable action) { |
1997 |
return orRunStage(null, other, action); |
1998 |
} |
1999 |
|
2000 |
public CompletableFuture<Void> runAfterEitherAsync(CompletionStage<?> other, |
2001 |
Runnable action) { |
2002 |
return orRunStage(asyncPool, other, action); |
2003 |
} |
2004 |
|
2005 |
public CompletableFuture<Void> runAfterEitherAsync(CompletionStage<?> other, |
2006 |
Runnable action, |
2007 |
Executor executor) { |
2008 |
return orRunStage(screenExecutor(executor), other, action); |
2009 |
} |
2010 |
|
2011 |
public <U> CompletableFuture<U> thenCompose( |
2012 |
Function<? super T, ? extends CompletionStage<U>> fn) { |
2013 |
return uniComposeStage(null, fn); |
2014 |
} |
2015 |
|
2016 |
public <U> CompletableFuture<U> thenComposeAsync( |
2017 |
Function<? super T, ? extends CompletionStage<U>> fn) { |
2018 |
return uniComposeStage(asyncPool, fn); |
2019 |
} |
2020 |
|
2021 |
public <U> CompletableFuture<U> thenComposeAsync( |
2022 |
Function<? super T, ? extends CompletionStage<U>> fn, |
2023 |
Executor executor) { |
2024 |
return uniComposeStage(screenExecutor(executor), fn); |
2025 |
} |
2026 |
|
2027 |
public CompletableFuture<T> whenComplete( |
2028 |
BiConsumer<? super T, ? super Throwable> action) { |
2029 |
return uniWhenCompleteStage(null, action); |
2030 |
} |
2031 |
|
2032 |
public CompletableFuture<T> whenCompleteAsync( |
2033 |
BiConsumer<? super T, ? super Throwable> action) { |
2034 |
return uniWhenCompleteStage(asyncPool, action); |
2035 |
} |
2036 |
|
2037 |
public CompletableFuture<T> whenCompleteAsync( |
2038 |
BiConsumer<? super T, ? super Throwable> action, Executor executor) { |
2039 |
return uniWhenCompleteStage(screenExecutor(executor), action); |
2040 |
} |
2041 |
|
2042 |
public <U> CompletableFuture<U> handle( |
2043 |
BiFunction<? super T, Throwable, ? extends U> fn) { |
2044 |
return uniHandleStage(null, fn); |
2045 |
} |
2046 |
|
2047 |
public <U> CompletableFuture<U> handleAsync( |
2048 |
BiFunction<? super T, Throwable, ? extends U> fn) { |
2049 |
return uniHandleStage(asyncPool, fn); |
2050 |
} |
2051 |
|
2052 |
public <U> CompletableFuture<U> handleAsync( |
2053 |
BiFunction<? super T, Throwable, ? extends U> fn, Executor executor) { |
2054 |
return uniHandleStage(screenExecutor(executor), fn); |
2055 |
} |
2056 |
|
2057 |
/** |
2058 |
* Returns this CompletableFuture. |
2059 |
* |
2060 |
* @return this CompletableFuture |
2061 |
*/ |
2062 |
public CompletableFuture<T> toCompletableFuture() { |
2063 |
return this; |
2064 |
} |
2065 |
|
2066 |
// not in interface CompletionStage |
2067 |
|
2068 |
/** |
2069 |
* Returns a new CompletableFuture that is completed when this |
2070 |
* CompletableFuture completes, with the result of the given |
2071 |
* function of the exception triggering this CompletableFuture's |
2072 |
* completion when it completes exceptionally; otherwise, if this |
2073 |
* CompletableFuture completes normally, then the returned |
2074 |
* CompletableFuture also completes normally with the same value. |
2075 |
* Note: More flexible versions of this functionality are |
2076 |
* available using methods {@code whenComplete} and {@code handle}. |
2077 |
* |
2078 |
* @param fn the function to use to compute the value of the |
2079 |
* returned CompletableFuture if this CompletableFuture completed |
2080 |
* exceptionally |
2081 |
* @return the new CompletableFuture |
2082 |
*/ |
2083 |
public CompletableFuture<T> exceptionally( |
2084 |
Function<Throwable, ? extends T> fn) { |
2085 |
return uniExceptionallyStage(fn); |
2086 |
} |
2087 |
|
2088 |
/* ------------- Arbitrary-arity constructions -------------- */ |
2089 |
|
2090 |
/** |
2091 |
* Returns a new CompletableFuture that is completed when all of |
2092 |
* the given CompletableFutures complete. If any of the given |
2093 |
* CompletableFutures complete exceptionally, then the returned |
2094 |
* CompletableFuture also does so, with a CompletionException |
2095 |
* holding this exception as its cause. Otherwise, the results, |
2096 |
* if any, of the given CompletableFutures are not reflected in |
2097 |
* the returned CompletableFuture, but may be obtained by |
2098 |
* inspecting them individually. If no CompletableFutures are |
2099 |
* provided, returns a CompletableFuture completed with the value |
2100 |
* {@code null}. |
2101 |
* |
2102 |
* <p>Among the applications of this method is to await completion |
2103 |
* of a set of independent CompletableFutures before continuing a |
2104 |
* program, as in: {@code CompletableFuture.allOf(c1, c2, |
2105 |
* c3).join();}. |
2106 |
* |
2107 |
* @param cfs the CompletableFutures |
2108 |
* @return a new CompletableFuture that is completed when all of the |
2109 |
* given CompletableFutures complete |
2110 |
* @throws NullPointerException if the array or any of its elements are |
2111 |
* {@code null} |
2112 |
*/ |
2113 |
public static CompletableFuture<Void> allOf(CompletableFuture<?>... cfs) { |
2114 |
return andTree(cfs, 0, cfs.length - 1); |
2115 |
} |
2116 |
|
2117 |
/** |
2118 |
* Returns a new CompletableFuture that is completed when any of |
2119 |
* the given CompletableFutures complete, with the same result. |
2120 |
* Otherwise, if it completed exceptionally, the returned |
2121 |
* CompletableFuture also does so, with a CompletionException |
2122 |
* holding this exception as its cause. If no CompletableFutures |
2123 |
* are provided, returns an incomplete CompletableFuture. |
2124 |
* |
2125 |
* @param cfs the CompletableFutures |
2126 |
* @return a new CompletableFuture that is completed with the |
2127 |
* result or exception of any of the given CompletableFutures when |
2128 |
* one completes |
2129 |
* @throws NullPointerException if the array or any of its elements are |
2130 |
* {@code null} |
2131 |
*/ |
2132 |
public static CompletableFuture<Object> anyOf(CompletableFuture<?>... cfs) { |
2133 |
return orTree(cfs, 0, cfs.length - 1); |
2134 |
} |
2135 |
|
2136 |
/* ------------- Control and status methods -------------- */ |
2137 |
|
2138 |
/** |
2139 |
* If not already completed, completes this CompletableFuture with |
2140 |
* a {@link CancellationException}. Dependent CompletableFutures |
2141 |
* that have not already completed will also complete |
2142 |
* exceptionally, with a {@link CompletionException} caused by |
2143 |
* this {@code CancellationException}. |
2144 |
* |
2145 |
* @param mayInterruptIfRunning this value has no effect in this |
2146 |
* implementation because interrupts are not used to control |
2147 |
* processing. |
2148 |
* |
2149 |
* @return {@code true} if this task is now cancelled |
2150 |
*/ |
2151 |
public boolean cancel(boolean mayInterruptIfRunning) { |
2152 |
boolean cancelled = (result == null) && |
2153 |
internalComplete(new AltResult(new CancellationException())); |
2154 |
postComplete(); |
2155 |
return cancelled || isCancelled(); |
2156 |
} |
2157 |
|
2158 |
/** |
2159 |
* Returns {@code true} if this CompletableFuture was cancelled |
2160 |
* before it completed normally. |
2161 |
* |
2162 |
* @return {@code true} if this CompletableFuture was cancelled |
2163 |
* before it completed normally |
2164 |
*/ |
2165 |
public boolean isCancelled() { |
2166 |
Object r; |
2167 |
return ((r = result) instanceof AltResult) && |
2168 |
(((AltResult)r).ex instanceof CancellationException); |
2169 |
} |
2170 |
|
2171 |
/** |
2172 |
* Returns {@code true} if this CompletableFuture completed |
2173 |
* exceptionally, in any way. Possible causes include |
2174 |
* cancellation, explicit invocation of {@code |
2175 |
* completeExceptionally}, and abrupt termination of a |
2176 |
* CompletionStage action. |
2177 |
* |
2178 |
* @return {@code true} if this CompletableFuture completed |
2179 |
* exceptionally |
2180 |
*/ |
2181 |
public boolean isCompletedExceptionally() { |
2182 |
Object r; |
2183 |
return ((r = result) instanceof AltResult) && r != NIL; |
2184 |
} |
2185 |
|
2186 |
/** |
2187 |
* Forcibly sets or resets the value subsequently returned by |
2188 |
* method {@link #get()} and related methods, whether or not |
2189 |
* already completed. This method is designed for use only in |
2190 |
* error recovery actions, and even in such situations may result |
2191 |
* in ongoing dependent completions using established versus |
2192 |
* overwritten outcomes. |
2193 |
* |
2194 |
* @param value the completion value |
2195 |
*/ |
2196 |
public void obtrudeValue(T value) { |
2197 |
result = (value == null) ? NIL : value; |
2198 |
postComplete(); |
2199 |
} |
2200 |
|
2201 |
/** |
2202 |
* Forcibly causes subsequent invocations of method {@link #get()} |
2203 |
* and related methods to throw the given exception, whether or |
2204 |
* not already completed. This method is designed for use only in |
2205 |
* error recovery actions, and even in such situations may result |
2206 |
* in ongoing dependent completions using established versus |
2207 |
* overwritten outcomes. |
2208 |
* |
2209 |
* @param ex the exception |
2210 |
* @throws NullPointerException if the exception is null |
2211 |
*/ |
2212 |
public void obtrudeException(Throwable ex) { |
2213 |
if (ex == null) throw new NullPointerException(); |
2214 |
result = new AltResult(ex); |
2215 |
postComplete(); |
2216 |
} |
2217 |
|
2218 |
/** |
2219 |
* Returns the estimated number of CompletableFutures whose |
2220 |
* completions are awaiting completion of this CompletableFuture. |
2221 |
* This method is designed for use in monitoring system state, not |
2222 |
* for synchronization control. |
2223 |
* |
2224 |
* @return the number of dependent CompletableFutures |
2225 |
*/ |
2226 |
public int getNumberOfDependents() { |
2227 |
int count = 0; |
2228 |
for (Completion p = stack; p != null; p = p.next) |
2229 |
++count; |
2230 |
return count; |
2231 |
} |
2232 |
|
2233 |
/** |
2234 |
* Returns a string identifying this CompletableFuture, as well as |
2235 |
* its completion state. The state, in brackets, contains the |
2236 |
* String {@code "Completed Normally"} or the String {@code |
2237 |
* "Completed Exceptionally"}, or the String {@code "Not |
2238 |
* completed"} followed by the number of CompletableFutures |
2239 |
* dependent upon its completion, if any. |
2240 |
* |
2241 |
* @return a string identifying this CompletableFuture, as well as its state |
2242 |
*/ |
2243 |
public String toString() { |
2244 |
Object r = result; |
2245 |
int count; |
2246 |
return super.toString() + |
2247 |
((r == null) ? |
2248 |
(((count = getNumberOfDependents()) == 0) ? |
2249 |
"[Not completed]" : |
2250 |
"[Not completed, " + count + " dependents]") : |
2251 |
(((r instanceof AltResult) && ((AltResult)r).ex != null) ? |
2252 |
"[Completed exceptionally]" : |
2253 |
"[Completed normally]")); |
2254 |
} |
2255 |
|
2256 |
// Unsafe mechanics |
2257 |
private static final sun.misc.Unsafe UNSAFE; |
2258 |
private static final long RESULT; |
2259 |
private static final long STACK; |
2260 |
static { |
2261 |
try { |
2262 |
UNSAFE = sun.misc.Unsafe.getUnsafe(); |
2263 |
Class<?> k = CompletableFuture.class; |
2264 |
RESULT = UNSAFE.objectFieldOffset |
2265 |
(k.getDeclaredField("result")); |
2266 |
STACK = UNSAFE.objectFieldOffset |
2267 |
(k.getDeclaredField("stack")); |
2268 |
} catch (Exception x) { |
2269 |
throw new Error(x); |
2270 |
} |
2271 |
} |
2272 |
} |