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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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package java.util.concurrent; |
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import java.util.function.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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1.5 |
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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1.1 |
import java.util.concurrent.locks.LockSupport; |
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/** |
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* A {@link Future} that may be explicitly completed (setting its |
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* value and status), and may be used as a {@link CompletionStage}, |
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* supporting dependent functions and actions that trigger upon its |
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* completion. |
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* |
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* <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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* 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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1.104 |
*/ |
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1.113 |
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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final boolean internalComplete(Object r) { // CAS from null to r |
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return UNSAFE.compareAndSwapObject(this, RESULT, null, r); |
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} |
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final boolean casStack(Completion cmp, Completion val) { |
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return UNSAFE.compareAndSwapObject(this, STACK, cmp, val); |
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} |
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/* ------------- Encoding and decoding outcomes -------------- */ |
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static final class AltResult { // See above |
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final Throwable ex; // null only for NIL |
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AltResult(Throwable x) { this.ex = x; } |
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1.1 |
} |
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static final AltResult NIL = new AltResult(null); |
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/** |
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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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* 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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static Object encodeOutcome(Object v, Throwable x) { |
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return (x == null) ? (v == null) ? NIL : v : encodeThrowable(x); |
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1.20 |
} |
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/** |
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1.115 |
* Returns the encoding of a copied outcome; if exceptional, |
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* rewraps as a CompletionException, else returns argument. |
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1.1 |
*/ |
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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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1.1 |
} |
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/** |
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1.108 |
* 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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1.28 |
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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1.28 |
} |
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1.113 |
@SuppressWarnings("unchecked") T t = (T) r; |
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return t; |
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dl |
1.1 |
} |
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1.113 |
/** |
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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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/* ------------- Async task preliminaries -------------- */ |
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|
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1.1 |
/** |
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jsr166 |
1.56 |
* A marker interface identifying asynchronous tasks produced by |
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1.28 |
* {@code async} methods. This may be useful for monitoring, |
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* debugging, and tracking asynchronous activities. |
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jsr166 |
1.57 |
* |
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* @since 1.8 |
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1.1 |
*/ |
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1.28 |
public static interface AsynchronousCompletionTask { |
288 |
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1.1 |
} |
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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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static final Executor asyncPool = |
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(ForkJoinPool.getCommonPoolParallelism() > 1) ? |
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ForkJoinPool.commonPool() : new ThreadPerTaskExecutor(); |
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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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* 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 (e == null) throw new NullPointerException(); |
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return (e == ForkJoinPool.commonPool()) ? asyncPool : e; |
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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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@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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1.113 |
* 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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1.113 |
abstract CompletableFuture<?> tryFire(int mode); |
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jsr166 |
1.116 |
/** Returns true if possibly still triggerable. Used by cleanStack. */ |
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1.113 |
abstract boolean isLive(); |
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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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1.96 |
} |
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/** |
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1.113 |
* Pops and tries to trigger all reachable dependents. Call only |
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* when known to be done. |
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1.104 |
*/ |
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final void postComplete() { |
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/* |
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1.113 |
* On each step, variable f holds current dependents to pop |
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1.104 |
* and run. It is extended along only one path at a time, |
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1.113 |
* pushing others to avoid unbounded recursion. |
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1.104 |
*/ |
351 |
dl |
1.110 |
CompletableFuture<?> f = this; Completion h; |
352 |
dl |
1.113 |
while ((h = f.stack) != null || |
353 |
|
|
(f != this && (h = (f = this).stack) != null)) { |
354 |
dl |
1.110 |
CompletableFuture<?> d; Completion t; |
355 |
dl |
1.113 |
if (f.casStack(h, t = h.next)) { |
356 |
dl |
1.104 |
if (t != null) { |
357 |
|
|
if (f != this) { // push |
358 |
dl |
1.113 |
do {} while (!casStack(h.next = stack, h)); |
359 |
dl |
1.104 |
continue; |
360 |
|
|
} |
361 |
|
|
h.next = null; // detach |
362 |
dl |
1.28 |
} |
363 |
dl |
1.113 |
f = (d = h.tryFire(NESTED)) == null ? this : d; |
364 |
dl |
1.19 |
} |
365 |
|
|
} |
366 |
|
|
} |
367 |
|
|
|
368 |
dl |
1.113 |
/** Traverses stack and unlinks dead Completions. */ |
369 |
|
|
final void cleanStack() { |
370 |
|
|
for (Completion p = null, q = stack; q != null;) { |
371 |
|
|
Completion s = q.next; |
372 |
|
|
if (q.isLive()) { |
373 |
|
|
p = q; |
374 |
|
|
q = s; |
375 |
|
|
} |
376 |
|
|
else if (p == null) { |
377 |
|
|
casStack(q, s); |
378 |
|
|
q = stack; |
379 |
|
|
} |
380 |
|
|
else { |
381 |
|
|
p.next = s; |
382 |
|
|
if (p.isLive()) |
383 |
|
|
q = s; |
384 |
|
|
else { |
385 |
|
|
p = null; // restart |
386 |
|
|
q = stack; |
387 |
|
|
} |
388 |
|
|
} |
389 |
|
|
} |
390 |
|
|
} |
391 |
|
|
|
392 |
|
|
/* ------------- One-input Completions -------------- */ |
393 |
dl |
1.104 |
|
394 |
dl |
1.113 |
/** A Completion with a source, dependent, and executor. */ |
395 |
|
|
@SuppressWarnings("serial") |
396 |
dl |
1.110 |
abstract static class UniCompletion<T> extends Completion { |
397 |
dl |
1.113 |
Executor executor; // executor to use (null if none) |
398 |
dl |
1.104 |
CompletableFuture<T> dep; // the dependent to complete |
399 |
dl |
1.113 |
CompletableFuture<?> src; // source for action |
400 |
dl |
1.104 |
|
401 |
dl |
1.113 |
UniCompletion(Executor executor, CompletableFuture<T> dep, |
402 |
dl |
1.104 |
CompletableFuture<?> src) { |
403 |
dl |
1.113 |
this.executor = executor; this.dep = dep; this.src = src; |
404 |
dl |
1.104 |
} |
405 |
|
|
|
406 |
dl |
1.113 |
/** |
407 |
|
|
* Returns true if action can be run. Call only when known to |
408 |
|
|
* be triggerable. Uses FJ tag bit to ensure that only one |
409 |
|
|
* thread claims ownership. If async, starts as task -- a |
410 |
|
|
* later call to tryFire will run action. |
411 |
|
|
*/ |
412 |
|
|
final boolean claim() { |
413 |
|
|
Executor e = executor; |
414 |
|
|
if (compareAndSetForkJoinTaskTag((short)0, (short)1)) { |
415 |
|
|
if (e == null) |
416 |
|
|
return true; |
417 |
|
|
executor = null; // disable |
418 |
|
|
e.execute(this); |
419 |
|
|
} |
420 |
|
|
return false; |
421 |
dl |
1.104 |
} |
422 |
|
|
|
423 |
dl |
1.113 |
final boolean isLive() { return dep != null; } |
424 |
dl |
1.1 |
} |
425 |
|
|
|
426 |
dl |
1.113 |
/** Pushes the given completion (if it exists) unless done. */ |
427 |
|
|
final void push(UniCompletion<?> c) { |
428 |
dl |
1.104 |
if (c != null) { |
429 |
dl |
1.113 |
while (result == null && !casStack(c.next = stack, c)) |
430 |
|
|
c.next = null; // clear on failure |
431 |
dl |
1.104 |
} |
432 |
|
|
} |
433 |
|
|
|
434 |
dl |
1.113 |
/** |
435 |
|
|
* Post-processing by dependent after successful UniCompletion |
436 |
|
|
* tryFire. Tries to clean stack of source a, and then either runs |
437 |
|
|
* postComplete or returns this to caller, depending on mode. |
438 |
|
|
*/ |
439 |
|
|
final CompletableFuture<T> postFire(CompletableFuture<?> a, int mode) { |
440 |
|
|
if (a != null && a.stack != null) { |
441 |
|
|
if (mode < 0 || a.result == null) |
442 |
|
|
a.cleanStack(); |
443 |
dl |
1.104 |
else |
444 |
dl |
1.113 |
a.postComplete(); |
445 |
dl |
1.1 |
} |
446 |
dl |
1.113 |
if (result != null && stack != null) { |
447 |
|
|
if (mode < 0) |
448 |
|
|
return this; |
449 |
|
|
else |
450 |
|
|
postComplete(); |
451 |
dl |
1.1 |
} |
452 |
dl |
1.113 |
return null; |
453 |
dl |
1.1 |
} |
454 |
|
|
|
455 |
dl |
1.113 |
@SuppressWarnings("serial") |
456 |
|
|
static final class UniApply<T,U> extends UniCompletion<U> { |
457 |
dl |
1.104 |
Function<? super T,? extends U> fn; |
458 |
dl |
1.113 |
UniApply(Executor executor, CompletableFuture<U> dep, |
459 |
|
|
CompletableFuture<?> src, Function<? super T,? extends U> fn) { |
460 |
|
|
super(executor, dep, src); this.fn = fn; |
461 |
|
|
} |
462 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
463 |
|
|
CompletableFuture<U> d; CompletableFuture<?> a; |
464 |
|
|
if ((d = dep) == null || |
465 |
|
|
!d.uniApply(a = src, fn, mode > 0 ? null : this)) |
466 |
|
|
return null; |
467 |
|
|
dep = null; src = null; fn = null; |
468 |
|
|
return d.postFire(a, mode); |
469 |
dl |
1.7 |
} |
470 |
|
|
} |
471 |
|
|
|
472 |
dl |
1.113 |
final <S> boolean uniApply(CompletableFuture<?> a, |
473 |
|
|
Function<? super S,? extends T> f, |
474 |
|
|
UniApply<S,T> c) { |
475 |
|
|
Object r; T u; Throwable x; |
476 |
|
|
if (a == null || (r = a.result) == null || f == null) |
477 |
|
|
return false; |
478 |
|
|
if (result == null) { |
479 |
|
|
try { |
480 |
|
|
if (r instanceof AltResult) { |
481 |
|
|
x = ((AltResult)r).ex; |
482 |
|
|
r = null; |
483 |
|
|
} |
484 |
|
|
else |
485 |
|
|
x = null; |
486 |
|
|
if (x != null) |
487 |
|
|
u = null; |
488 |
|
|
else if (c != null && !c.claim()) |
489 |
|
|
return false; |
490 |
|
|
else { |
491 |
|
|
@SuppressWarnings("unchecked") S t = (S) r; |
492 |
|
|
u = f.apply(t); |
493 |
dl |
1.21 |
} |
494 |
dl |
1.113 |
} catch (Throwable ex) { |
495 |
|
|
x = ex; |
496 |
|
|
u = null; |
497 |
dl |
1.7 |
} |
498 |
dl |
1.113 |
internalComplete(encodeOutcome(u, x)); |
499 |
dl |
1.7 |
} |
500 |
dl |
1.113 |
return true; |
501 |
dl |
1.7 |
} |
502 |
|
|
|
503 |
dl |
1.113 |
private <U> CompletableFuture<U> uniApplyStage( |
504 |
|
|
Executor e, Function<? super T,? extends U> f) { |
505 |
|
|
if (f == null) throw new NullPointerException(); |
506 |
|
|
CompletableFuture<U> d = new CompletableFuture<U>(); |
507 |
|
|
if (e != null || !d.uniApply(this, f, null)) { |
508 |
|
|
UniApply<T,U> c = new UniApply<T,U>(e, d, this, f); |
509 |
|
|
push(c); |
510 |
|
|
c.tryFire(SYNC); |
511 |
dl |
1.37 |
} |
512 |
dl |
1.113 |
return d; |
513 |
dl |
1.37 |
} |
514 |
|
|
|
515 |
dl |
1.113 |
@SuppressWarnings("serial") |
516 |
|
|
static final class UniAccept<T> extends UniCompletion<Void> { |
517 |
dl |
1.104 |
Consumer<? super T> fn; |
518 |
dl |
1.113 |
UniAccept(Executor executor, CompletableFuture<Void> dep, |
519 |
|
|
CompletableFuture<?> src, Consumer<? super T> fn) { |
520 |
|
|
super(executor, dep, src); this.fn = fn; |
521 |
|
|
} |
522 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
523 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a; |
524 |
|
|
if ((d = dep) == null || |
525 |
|
|
!d.uniAccept(a = src, fn, mode > 0 ? null : this)) |
526 |
|
|
return null; |
527 |
|
|
dep = null; src = null; fn = null; |
528 |
|
|
return d.postFire(a, mode); |
529 |
dl |
1.91 |
} |
530 |
|
|
} |
531 |
|
|
|
532 |
dl |
1.113 |
final <S> boolean uniAccept(CompletableFuture<?> a, |
533 |
|
|
Consumer<? super S> f, UniAccept<S> c) { |
534 |
|
|
Object r; Throwable x; |
535 |
|
|
if (a == null || (r = a.result) == null || f == null) |
536 |
|
|
return false; |
537 |
|
|
if (result == null) { |
538 |
|
|
try { |
539 |
|
|
if (r instanceof AltResult) { |
540 |
|
|
x = ((AltResult)r).ex; |
541 |
|
|
r = null; |
542 |
|
|
} |
543 |
|
|
else |
544 |
|
|
x = null; |
545 |
|
|
if (x == null) { |
546 |
|
|
if (c != null && !c.claim()) |
547 |
|
|
return false; |
548 |
|
|
else { |
549 |
|
|
@SuppressWarnings("unchecked") S t = (S) r; |
550 |
|
|
f.accept(t); |
551 |
dl |
1.17 |
} |
552 |
|
|
} |
553 |
dl |
1.113 |
} catch (Throwable ex) { |
554 |
|
|
x = ex; |
555 |
dl |
1.1 |
} |
556 |
dl |
1.113 |
internalComplete(encodeOutcome(null, x)); |
557 |
dl |
1.1 |
} |
558 |
dl |
1.113 |
return true; |
559 |
dl |
1.1 |
} |
560 |
|
|
|
561 |
dl |
1.113 |
private CompletableFuture<Void> uniAcceptStage(Executor e, |
562 |
|
|
Consumer<? super T> f) { |
563 |
|
|
if (f == null) throw new NullPointerException(); |
564 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
565 |
|
|
if (e != null || !d.uniAccept(this, f, null)) { |
566 |
|
|
UniAccept<T> c = new UniAccept<T>(e, d, this, f); |
567 |
|
|
push(c); |
568 |
|
|
c.tryFire(SYNC); |
569 |
dl |
1.7 |
} |
570 |
dl |
1.113 |
return d; |
571 |
dl |
1.7 |
} |
572 |
|
|
|
573 |
dl |
1.113 |
@SuppressWarnings("serial") |
574 |
|
|
static final class UniRun extends UniCompletion<Void> { |
575 |
jsr166 |
1.105 |
Runnable fn; |
576 |
dl |
1.113 |
UniRun(Executor executor, CompletableFuture<Void> dep, |
577 |
|
|
CompletableFuture<?> src, Runnable fn) { |
578 |
|
|
super(executor, dep, src); this.fn = fn; |
579 |
|
|
} |
580 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
581 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a; |
582 |
|
|
if ((d = dep) == null || |
583 |
|
|
!d.uniRun(a = src, fn, mode > 0 ? null : this)) |
584 |
|
|
return null; |
585 |
|
|
dep = null; src = null; fn = null; |
586 |
|
|
return d.postFire(a, mode); |
587 |
dl |
1.1 |
} |
588 |
|
|
} |
589 |
|
|
|
590 |
dl |
1.113 |
final boolean uniRun(CompletableFuture<?> a, Runnable f, UniRun c) { |
591 |
|
|
Object r; Throwable x; |
592 |
|
|
if (a == null || (r = a.result) == null || f == null) |
593 |
|
|
return false; |
594 |
|
|
if (result == null) { |
595 |
dl |
1.104 |
try { |
596 |
dl |
1.113 |
if (r instanceof AltResult) |
597 |
|
|
x = ((AltResult)r).ex; |
598 |
|
|
else |
599 |
|
|
x = null; |
600 |
|
|
if (x == null) { |
601 |
|
|
if (c != null && !c.claim()) |
602 |
|
|
return false; |
603 |
|
|
else |
604 |
|
|
f.run(); |
605 |
|
|
} |
606 |
dl |
1.104 |
} catch (Throwable ex) { |
607 |
|
|
x = ex; |
608 |
jsr166 |
1.2 |
} |
609 |
dl |
1.113 |
internalComplete(encodeOutcome(null, x)); |
610 |
jsr166 |
1.2 |
} |
611 |
dl |
1.113 |
return true; |
612 |
dl |
1.1 |
} |
613 |
|
|
|
614 |
dl |
1.113 |
private CompletableFuture<Void> uniRunStage(Executor e, Runnable f) { |
615 |
|
|
if (f == null) throw new NullPointerException(); |
616 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
617 |
|
|
if (e != null || !d.uniRun(this, f, null)) { |
618 |
|
|
UniRun c = new UniRun(e, d, this, f); |
619 |
|
|
push(c); |
620 |
|
|
c.tryFire(SYNC); |
621 |
dl |
1.7 |
} |
622 |
dl |
1.113 |
return d; |
623 |
dl |
1.7 |
} |
624 |
|
|
|
625 |
dl |
1.113 |
@SuppressWarnings("serial") |
626 |
|
|
static final class UniWhenComplete<T> extends UniCompletion<T> { |
627 |
|
|
BiConsumer<? super T, ? super Throwable> fn; |
628 |
|
|
UniWhenComplete(Executor executor, CompletableFuture<T> dep, |
629 |
|
|
CompletableFuture<?> src, |
630 |
|
|
BiConsumer<? super T, ? super Throwable> fn) { |
631 |
|
|
super(executor, dep, src); this.fn = fn; |
632 |
|
|
} |
633 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
634 |
|
|
CompletableFuture<T> d; CompletableFuture<?> a; |
635 |
|
|
if ((d = dep) == null || |
636 |
|
|
!d.uniWhenComplete(a = src, fn, mode > 0 ? null : this)) |
637 |
|
|
return null; |
638 |
|
|
dep = null; src = null; fn = null; |
639 |
|
|
return d.postFire(a, mode); |
640 |
|
|
} |
641 |
|
|
} |
642 |
dl |
1.104 |
|
643 |
dl |
1.113 |
final boolean uniWhenComplete(CompletableFuture<?> a, |
644 |
|
|
BiConsumer<? super T,? super Throwable> f, |
645 |
|
|
UniWhenComplete<T> c) { |
646 |
|
|
Object r; |
647 |
|
|
if (a == null || (r = a.result) == null || f == null) |
648 |
|
|
return false; |
649 |
|
|
if (result == null) { |
650 |
|
|
Throwable x = null, y = null; |
651 |
dl |
1.104 |
try { |
652 |
dl |
1.113 |
if (r instanceof AltResult) { |
653 |
|
|
x = ((AltResult)r).ex; |
654 |
|
|
r = null; |
655 |
|
|
} |
656 |
|
|
if (c != null && !c.claim()) |
657 |
|
|
return false; |
658 |
|
|
else { |
659 |
|
|
@SuppressWarnings("unchecked") T t = (T) r; |
660 |
|
|
f.accept(t, x); |
661 |
jsr166 |
1.2 |
} |
662 |
dl |
1.104 |
} catch (Throwable ex) { |
663 |
dl |
1.113 |
y = ex; |
664 |
jsr166 |
1.2 |
} |
665 |
dl |
1.113 |
internalComplete(encodeOutcome(r, x != null ? x : y)); |
666 |
jsr166 |
1.2 |
} |
667 |
dl |
1.113 |
return true; |
668 |
dl |
1.1 |
} |
669 |
|
|
|
670 |
dl |
1.113 |
private CompletableFuture<T> uniWhenCompleteStage( |
671 |
|
|
Executor e, BiConsumer<? super T, ? super Throwable> f) { |
672 |
|
|
if (f == null) throw new NullPointerException(); |
673 |
|
|
CompletableFuture<T> d = new CompletableFuture<T>(); |
674 |
|
|
if (e != null || !d.uniWhenComplete(this, f, null)) { |
675 |
|
|
UniWhenComplete<T> c = new UniWhenComplete<T>(e, d, this, f); |
676 |
|
|
push(c); |
677 |
|
|
c.tryFire(SYNC); |
678 |
dl |
1.35 |
} |
679 |
dl |
1.113 |
return d; |
680 |
dl |
1.35 |
} |
681 |
|
|
|
682 |
dl |
1.113 |
@SuppressWarnings("serial") |
683 |
|
|
static final class UniHandle<T,U> extends UniCompletion<U> { |
684 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn; |
685 |
|
|
UniHandle(Executor executor, CompletableFuture<U> dep, |
686 |
|
|
CompletableFuture<?> src, |
687 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn) { |
688 |
|
|
super(executor, dep, src); this.fn = fn; |
689 |
|
|
} |
690 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
691 |
|
|
CompletableFuture<U> d; CompletableFuture<?> a; |
692 |
|
|
if ((d = dep) == null || |
693 |
|
|
!d.uniHandle(a = src, fn, mode > 0 ? null : this)) |
694 |
|
|
return null; |
695 |
|
|
dep = null; src = null; fn = null; |
696 |
|
|
return d.postFire(a, mode); |
697 |
jsr166 |
1.2 |
} |
698 |
dl |
1.1 |
} |
699 |
|
|
|
700 |
dl |
1.113 |
final <S> boolean uniHandle(CompletableFuture<?> a, |
701 |
|
|
BiFunction<? super S, Throwable, ? extends T> f, |
702 |
|
|
UniHandle<S,T> c) { |
703 |
|
|
Object r; T u; Throwable x, y; |
704 |
|
|
if (a == null || (r = a.result) == null || f == null) |
705 |
|
|
return false; |
706 |
|
|
if (result == null) { |
707 |
dl |
1.104 |
try { |
708 |
dl |
1.113 |
if (r instanceof AltResult) { |
709 |
|
|
x = ((AltResult)r).ex; |
710 |
|
|
r = null; |
711 |
|
|
} |
712 |
|
|
else |
713 |
|
|
x = null; |
714 |
|
|
if (c != null && !c.claim()) |
715 |
|
|
return false; |
716 |
|
|
else { |
717 |
|
|
@SuppressWarnings("unchecked") S t = (S) r; |
718 |
|
|
u = f.apply(t, x); |
719 |
|
|
y = null; |
720 |
dl |
1.1 |
} |
721 |
dl |
1.104 |
} catch (Throwable ex) { |
722 |
dl |
1.113 |
y = ex; |
723 |
dl |
1.104 |
u = null; |
724 |
jsr166 |
1.2 |
} |
725 |
dl |
1.113 |
internalComplete(encodeOutcome(u, y)); |
726 |
jsr166 |
1.2 |
} |
727 |
dl |
1.113 |
return true; |
728 |
dl |
1.1 |
} |
729 |
|
|
|
730 |
dl |
1.113 |
private <U> CompletableFuture<U> uniHandleStage( |
731 |
|
|
Executor e, BiFunction<? super T, Throwable, ? extends U> f) { |
732 |
|
|
if (f == null) throw new NullPointerException(); |
733 |
|
|
CompletableFuture<U> d = new CompletableFuture<U>(); |
734 |
|
|
if (e != null || !d.uniHandle(this, f, null)) { |
735 |
|
|
UniHandle<T,U> c = new UniHandle<T,U>(e, d, this, f); |
736 |
|
|
push(c); |
737 |
|
|
c.tryFire(SYNC); |
738 |
dl |
1.35 |
} |
739 |
dl |
1.104 |
return d; |
740 |
dl |
1.1 |
} |
741 |
|
|
|
742 |
dl |
1.113 |
@SuppressWarnings("serial") |
743 |
|
|
static final class UniExceptionally<T> extends UniCompletion<T> { |
744 |
dl |
1.104 |
Function<? super Throwable, ? extends T> fn; |
745 |
dl |
1.113 |
UniExceptionally(CompletableFuture<T> dep, CompletableFuture<?> src, |
746 |
|
|
Function<? super Throwable, ? extends T> fn) { |
747 |
dl |
1.104 |
super(null, dep, src); this.fn = fn; |
748 |
|
|
} |
749 |
dl |
1.113 |
final CompletableFuture<?> tryFire(int mode) { // never ASYNC |
750 |
|
|
CompletableFuture<T> d; CompletableFuture<?> a; |
751 |
|
|
if ((d = dep) == null || !d.uniExceptionally(a = src, fn, this)) |
752 |
|
|
return null; |
753 |
|
|
dep = null; src = null; fn = null; |
754 |
|
|
return d.postFire(a, mode); |
755 |
dl |
1.17 |
} |
756 |
|
|
} |
757 |
|
|
|
758 |
dl |
1.113 |
final boolean uniExceptionally(CompletableFuture<?> a, |
759 |
|
|
Function<? super Throwable, ? extends T> f, |
760 |
|
|
UniExceptionally<T> c) { |
761 |
|
|
Object r; T t; Throwable x, y; |
762 |
|
|
if (a == null || (r = a.result) == null || f == null) |
763 |
|
|
return false; |
764 |
|
|
if (r instanceof AltResult) |
765 |
|
|
x = ((AltResult)r).ex; |
766 |
dl |
1.104 |
else |
767 |
dl |
1.113 |
x = null; |
768 |
|
|
if (result == null) { |
769 |
|
|
try { |
770 |
|
|
if (c != null && !c.claim()) |
771 |
|
|
return false; |
772 |
|
|
else if (x == null) { |
773 |
|
|
@SuppressWarnings("unchecked") T tr = (T) r; |
774 |
|
|
t = tr; |
775 |
|
|
y = null; |
776 |
|
|
} |
777 |
|
|
else { |
778 |
|
|
t = f.apply(x); |
779 |
|
|
y = null; |
780 |
|
|
} |
781 |
|
|
} catch (Throwable ex) { |
782 |
|
|
y = ex; |
783 |
|
|
t = null; |
784 |
|
|
} |
785 |
|
|
internalComplete(encodeOutcome(t, y)); |
786 |
|
|
} |
787 |
|
|
return true; |
788 |
dl |
1.75 |
} |
789 |
|
|
|
790 |
dl |
1.113 |
private CompletableFuture<T> uniExceptionallyStage( |
791 |
|
|
Function<Throwable, ? extends T> f) { |
792 |
|
|
if (f == null) throw new NullPointerException(); |
793 |
|
|
CompletableFuture<T> d = new CompletableFuture<T>(); |
794 |
|
|
if (!d.uniExceptionally(this, f, null)) { |
795 |
|
|
UniExceptionally<T> c = new UniExceptionally<T>(d, this, f); |
796 |
|
|
push(c); |
797 |
|
|
c.tryFire(SYNC); |
798 |
dl |
1.17 |
} |
799 |
dl |
1.113 |
return d; |
800 |
dl |
1.17 |
} |
801 |
|
|
|
802 |
dl |
1.113 |
@SuppressWarnings("serial") |
803 |
|
|
static final class UniRelay<T> extends UniCompletion<T> { // for Compose |
804 |
|
|
UniRelay(CompletableFuture<T> dep, CompletableFuture<?> src) { |
805 |
dl |
1.104 |
super(null, dep, src); |
806 |
|
|
} |
807 |
dl |
1.113 |
final CompletableFuture<?> tryFire(int mode) { |
808 |
|
|
CompletableFuture<T> d; CompletableFuture<?> a; |
809 |
|
|
if ((d = dep) == null || !d.uniRelay(a = src)) |
810 |
|
|
return null; |
811 |
|
|
src = null; dep = null; |
812 |
|
|
return d.postFire(a, mode); |
813 |
dl |
1.28 |
} |
814 |
|
|
} |
815 |
|
|
|
816 |
dl |
1.113 |
final boolean uniRelay(CompletableFuture<?> a) { |
817 |
|
|
Object r; |
818 |
|
|
if (a == null || (r = a.result) == null) |
819 |
|
|
return false; |
820 |
|
|
Object s = encodeRelay(r); |
821 |
|
|
if (result == null) // no need to claim |
822 |
|
|
internalComplete(s); |
823 |
|
|
return true; |
824 |
|
|
} |
825 |
dl |
1.28 |
|
826 |
dl |
1.113 |
@SuppressWarnings("serial") |
827 |
|
|
static final class UniCompose<T,U> extends UniCompletion<U> { |
828 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn; |
829 |
|
|
UniCompose(Executor executor, CompletableFuture<U> dep, |
830 |
|
|
CompletableFuture<?> src, |
831 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn) { |
832 |
|
|
super(executor, dep, src); this.fn = fn; |
833 |
|
|
} |
834 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
835 |
|
|
CompletableFuture<U> d; CompletableFuture<?> 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<?> 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 |
|
|
try { |
853 |
|
|
if (r instanceof AltResult) { |
854 |
|
|
x = ((AltResult)r).ex; |
855 |
|
|
r = null; |
856 |
|
|
} |
857 |
|
|
else |
858 |
|
|
x = null; |
859 |
|
|
if (x == null) { |
860 |
|
|
if (c != null && !c.claim()) |
861 |
|
|
return false; |
862 |
dl |
1.104 |
else { |
863 |
dl |
1.113 |
@SuppressWarnings("unchecked") S t = (S) r; |
864 |
|
|
CompletableFuture<T> g = |
865 |
dl |
1.104 |
f.apply(t).toCompletableFuture(); |
866 |
dl |
1.113 |
if (g.result == null || !uniRelay(g)) { |
867 |
|
|
UniRelay<T> copy = new UniRelay<T>(this, g); |
868 |
|
|
g.push(copy); |
869 |
|
|
copy.tryFire(SYNC); |
870 |
|
|
if (result == null) |
871 |
|
|
return false; |
872 |
|
|
} |
873 |
dl |
1.104 |
} |
874 |
dl |
1.88 |
} |
875 |
dl |
1.113 |
} catch (Throwable ex) { |
876 |
|
|
x = ex; |
877 |
dl |
1.88 |
} |
878 |
dl |
1.113 |
if (x != null) |
879 |
|
|
internalComplete(encodeOutcome(null, x)); |
880 |
dl |
1.88 |
} |
881 |
dl |
1.113 |
return true; |
882 |
dl |
1.28 |
} |
883 |
|
|
|
884 |
dl |
1.113 |
private <U> CompletableFuture<U> uniComposeStage( |
885 |
|
|
Executor e, Function<? super T, ? extends CompletionStage<U>> f) { |
886 |
|
|
if (f == null) throw new NullPointerException(); |
887 |
|
|
Object r; Throwable x; |
888 |
|
|
if (e == null && (r = result) != null) { |
889 |
|
|
try { // try to return function result |
890 |
|
|
if (r instanceof AltResult) { |
891 |
|
|
x = ((AltResult)r).ex; |
892 |
|
|
r = null; |
893 |
|
|
} |
894 |
|
|
else |
895 |
|
|
x = null; |
896 |
|
|
if (x == null) { |
897 |
|
|
@SuppressWarnings("unchecked") T t = (T) r; |
898 |
|
|
return f.apply(t).toCompletableFuture(); |
899 |
|
|
} |
900 |
|
|
} catch (Throwable ex) { |
901 |
|
|
x = ex; |
902 |
dl |
1.104 |
} |
903 |
|
|
} |
904 |
dl |
1.113 |
else |
905 |
|
|
x = null; |
906 |
|
|
CompletableFuture<U> d = new CompletableFuture<U>(); |
907 |
|
|
if (x == null) { |
908 |
|
|
UniCompose<T,U> c = new UniCompose<T,U>(e, d, this, f); |
909 |
|
|
push(c); |
910 |
|
|
c.tryFire(SYNC); |
911 |
dl |
1.88 |
} |
912 |
dl |
1.113 |
else |
913 |
dl |
1.104 |
d.result = encodeOutcome(null, x); |
914 |
dl |
1.113 |
return d; |
915 |
dl |
1.28 |
} |
916 |
|
|
|
917 |
dl |
1.113 |
/* ------------- Two-input Completions -------------- */ |
918 |
dl |
1.104 |
|
919 |
dl |
1.113 |
/** A Completion for an action with two sources */ |
920 |
|
|
@SuppressWarnings("serial") |
921 |
jsr166 |
1.106 |
abstract static class BiCompletion<T> extends UniCompletion<T> { |
922 |
dl |
1.113 |
CompletableFuture<?> snd; // second source for action |
923 |
|
|
BiCompletion(Executor executor, CompletableFuture<T> dep, |
924 |
dl |
1.104 |
CompletableFuture<?> src, CompletableFuture<?> snd) { |
925 |
dl |
1.113 |
super(executor, dep, src); this.snd = snd; |
926 |
dl |
1.104 |
} |
927 |
|
|
} |
928 |
|
|
|
929 |
dl |
1.113 |
/** A Completion delegating to a BiCompletion */ |
930 |
|
|
@SuppressWarnings("serial") |
931 |
dl |
1.110 |
static final class CoCompletion extends Completion { |
932 |
dl |
1.113 |
BiCompletion<?> base; |
933 |
|
|
CoCompletion(BiCompletion<?> base) { this.base = base; } |
934 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
935 |
|
|
BiCompletion<?> c; CompletableFuture<?> d; |
936 |
|
|
if ((c = base) == null || (d = c.tryFire(mode)) == null) |
937 |
dl |
1.110 |
return null; |
938 |
dl |
1.113 |
base = null; // detach |
939 |
dl |
1.110 |
return d; |
940 |
dl |
1.88 |
} |
941 |
dl |
1.113 |
final boolean isLive() { |
942 |
|
|
BiCompletion<?> c; |
943 |
|
|
return (c = base) != null && c.dep != null; |
944 |
|
|
} |
945 |
dl |
1.88 |
} |
946 |
|
|
|
947 |
dl |
1.113 |
/** Pushes completion to this and b unless both done. */ |
948 |
|
|
final void bipush(CompletableFuture<?> b, BiCompletion<?> c) { |
949 |
|
|
if (c != null) { |
950 |
|
|
Object r; |
951 |
|
|
while ((r = result) == null && !casStack(c.next = stack, c)) |
952 |
dl |
1.104 |
c.next = null; |
953 |
dl |
1.113 |
if (b != null && b != this && b.result == null) { |
954 |
dl |
1.110 |
Completion q = (r != null) ? c : new CoCompletion(c); |
955 |
dl |
1.113 |
while (b.result == null && !b.casStack(q.next = b.stack, q)) |
956 |
dl |
1.104 |
q.next = null; |
957 |
dl |
1.88 |
} |
958 |
|
|
} |
959 |
dl |
1.104 |
} |
960 |
|
|
|
961 |
dl |
1.113 |
/** Post-processing after successful BiCompletion tryFire. */ |
962 |
|
|
final CompletableFuture<T> postFire(CompletableFuture<?> a, |
963 |
|
|
CompletableFuture<?> b, int mode) { |
964 |
|
|
if (b != null && b.stack != null) { // clean second source |
965 |
|
|
if (mode < 0 || b.result == null) |
966 |
|
|
b.cleanStack(); |
967 |
dl |
1.104 |
else |
968 |
dl |
1.113 |
b.postComplete(); |
969 |
dl |
1.88 |
} |
970 |
dl |
1.113 |
return postFire(a, mode); |
971 |
dl |
1.88 |
} |
972 |
|
|
|
973 |
dl |
1.113 |
@SuppressWarnings("serial") |
974 |
|
|
static final class BiApply<T,U,V> extends BiCompletion<V> { |
975 |
|
|
BiFunction<? super T,? super U,? extends V> fn; |
976 |
|
|
BiApply(Executor executor, CompletableFuture<V> dep, |
977 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, |
978 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
979 |
|
|
super(executor, dep, src, snd); this.fn = fn; |
980 |
|
|
} |
981 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
982 |
|
|
CompletableFuture<V> d; CompletableFuture<?> a, b; |
983 |
|
|
if ((d = dep) == null || |
984 |
|
|
!d.biApply(a = src, b = snd, fn, mode > 0 ? null : this)) |
985 |
|
|
return null; |
986 |
|
|
dep = null; snd = src = null; fn = null; |
987 |
|
|
return d.postFire(a, b, mode); |
988 |
dl |
1.104 |
} |
989 |
|
|
} |
990 |
|
|
|
991 |
dl |
1.113 |
final <R,S> boolean biApply(CompletableFuture<?> a, CompletableFuture<?> b, |
992 |
|
|
BiFunction<? super R,? super S,? extends T> f, |
993 |
|
|
BiApply<R,S,T> c) { |
994 |
|
|
Object r, s; T v; Throwable x; |
995 |
|
|
if (a == null || (r = a.result) == null || |
996 |
|
|
b == null || (s = b.result) == null || f == null) |
997 |
|
|
return false; |
998 |
|
|
if (result == null) { |
999 |
|
|
try { |
1000 |
|
|
if (r instanceof AltResult) { |
1001 |
|
|
x = ((AltResult)r).ex; |
1002 |
|
|
r = null; |
1003 |
|
|
} |
1004 |
|
|
else |
1005 |
|
|
x = null; |
1006 |
|
|
if (x == null && (s instanceof AltResult)) { |
1007 |
|
|
x = ((AltResult)s).ex; |
1008 |
|
|
s = null; |
1009 |
|
|
} |
1010 |
|
|
if (x != null) |
1011 |
|
|
v = null; |
1012 |
|
|
else if (c != null && !c.claim()) |
1013 |
|
|
return false; |
1014 |
|
|
else { |
1015 |
|
|
@SuppressWarnings("unchecked") R t = (R) r; |
1016 |
|
|
@SuppressWarnings("unchecked") S u = (S) s; |
1017 |
|
|
v = f.apply(t, u); |
1018 |
|
|
} |
1019 |
|
|
} catch (Throwable ex) { |
1020 |
|
|
x = ex; |
1021 |
|
|
v = null; |
1022 |
dl |
1.88 |
} |
1023 |
dl |
1.113 |
internalComplete(encodeOutcome(v, x)); |
1024 |
dl |
1.88 |
} |
1025 |
dl |
1.113 |
return true; |
1026 |
dl |
1.104 |
} |
1027 |
|
|
|
1028 |
dl |
1.113 |
private <U,V> CompletableFuture<V> biApplyStage( |
1029 |
|
|
Executor e, CompletionStage<? extends U> o, |
1030 |
|
|
BiFunction<? super T,? super U,? extends V> f) { |
1031 |
|
|
CompletableFuture<?> b; |
1032 |
|
|
if (f == null || (b = o.toCompletableFuture()) == null) |
1033 |
|
|
throw new NullPointerException(); |
1034 |
dl |
1.104 |
CompletableFuture<V> d = new CompletableFuture<V>(); |
1035 |
dl |
1.113 |
if (e != null || !d.biApply(this, b, f, null)) { |
1036 |
|
|
BiApply<T,U,V> c = new BiApply<T,U,V>(e, d, this, b, f); |
1037 |
|
|
bipush(b, c); |
1038 |
|
|
c.tryFire(SYNC); |
1039 |
|
|
} |
1040 |
dl |
1.104 |
return d; |
1041 |
|
|
} |
1042 |
|
|
|
1043 |
dl |
1.113 |
@SuppressWarnings("serial") |
1044 |
|
|
static final class BiAccept<T,U> extends BiCompletion<Void> { |
1045 |
|
|
BiConsumer<? super T,? super U> fn; |
1046 |
|
|
BiAccept(Executor executor, CompletableFuture<Void> dep, |
1047 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, |
1048 |
|
|
BiConsumer<? super T,? super U> fn) { |
1049 |
|
|
super(executor, dep, src, snd); this.fn = fn; |
1050 |
|
|
} |
1051 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
1052 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a, b; |
1053 |
|
|
if ((d = dep) == null || |
1054 |
|
|
!d.biAccept(a = src, b = snd, fn, mode > 0 ? null : this)) |
1055 |
|
|
return null; |
1056 |
|
|
dep = null; snd = src = null; fn = null; |
1057 |
|
|
return d.postFire(a, b, mode); |
1058 |
|
|
} |
1059 |
|
|
} |
1060 |
dl |
1.104 |
|
1061 |
dl |
1.113 |
final <R,S> boolean biAccept(CompletableFuture<?> a, CompletableFuture<?> b, |
1062 |
|
|
BiConsumer<? super R,? super S> f, |
1063 |
|
|
BiAccept<R,S> c) { |
1064 |
|
|
Object r, s; Throwable x; |
1065 |
|
|
if (a == null || (r = a.result) == null || |
1066 |
|
|
b == null || (s = b.result) == null || f == null) |
1067 |
|
|
return false; |
1068 |
|
|
if (result == null) { |
1069 |
|
|
try { |
1070 |
|
|
if (r instanceof AltResult) { |
1071 |
|
|
x = ((AltResult)r).ex; |
1072 |
|
|
r = null; |
1073 |
|
|
} |
1074 |
|
|
else |
1075 |
|
|
x = null; |
1076 |
|
|
if (x == null && (s instanceof AltResult)) { |
1077 |
|
|
x = ((AltResult)s).ex; |
1078 |
|
|
s = null; |
1079 |
|
|
} |
1080 |
|
|
if (x == null) { |
1081 |
|
|
if (c != null && !c.claim()) |
1082 |
|
|
return false; |
1083 |
|
|
else { |
1084 |
|
|
@SuppressWarnings("unchecked") R t = (R) r; |
1085 |
|
|
@SuppressWarnings("unchecked") S u = (S) s; |
1086 |
|
|
f.accept(t, u); |
1087 |
dl |
1.104 |
} |
1088 |
dl |
1.88 |
} |
1089 |
dl |
1.113 |
} catch (Throwable ex) { |
1090 |
|
|
x = ex; |
1091 |
dl |
1.88 |
} |
1092 |
dl |
1.113 |
internalComplete(encodeOutcome(null, x)); |
1093 |
dl |
1.104 |
} |
1094 |
dl |
1.113 |
return true; |
1095 |
dl |
1.104 |
} |
1096 |
|
|
|
1097 |
dl |
1.113 |
private <U> CompletableFuture<Void> biAcceptStage( |
1098 |
|
|
Executor e, CompletionStage<? extends U> o, |
1099 |
|
|
BiConsumer<? super T,? super U> f) { |
1100 |
|
|
CompletableFuture<?> b; |
1101 |
|
|
if (f == null || (b = o.toCompletableFuture()) == null) |
1102 |
|
|
throw new NullPointerException(); |
1103 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1104 |
|
|
if (e != null || !d.biAccept(this, b, f, null)) { |
1105 |
|
|
BiAccept<T,U> c = new BiAccept<T,U>(e, d, this, b, f); |
1106 |
|
|
bipush(b, c); |
1107 |
|
|
c.tryFire(SYNC); |
1108 |
dl |
1.104 |
} |
1109 |
dl |
1.113 |
return d; |
1110 |
dl |
1.104 |
} |
1111 |
|
|
|
1112 |
dl |
1.113 |
@SuppressWarnings("serial") |
1113 |
|
|
static final class BiRun extends BiCompletion<Void> { |
1114 |
|
|
Runnable fn; |
1115 |
|
|
BiRun(Executor executor, CompletableFuture<Void> dep, |
1116 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, |
1117 |
|
|
Runnable fn) { |
1118 |
|
|
super(executor, dep, src, snd); this.fn = fn; |
1119 |
|
|
} |
1120 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
1121 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a, b; |
1122 |
|
|
if ((d = dep) == null || |
1123 |
|
|
!d.biRun(a = src, b = snd, fn, mode > 0 ? null : this)) |
1124 |
|
|
return null; |
1125 |
|
|
dep = null; snd = src = null; fn = null; |
1126 |
|
|
return d.postFire(a, b, mode); |
1127 |
dl |
1.88 |
} |
1128 |
|
|
} |
1129 |
|
|
|
1130 |
dl |
1.113 |
final boolean biRun(CompletableFuture<?> a, CompletableFuture<?> b, |
1131 |
|
|
Runnable f, BiRun c) { |
1132 |
|
|
Object r, s; Throwable x; |
1133 |
|
|
if (a == null || (r = a.result) == null || |
1134 |
|
|
b == null || (s = b.result) == null || f == null) |
1135 |
|
|
return false; |
1136 |
|
|
if (result == null) { |
1137 |
|
|
try { |
1138 |
|
|
if (r instanceof AltResult) |
1139 |
|
|
x = ((AltResult)r).ex; |
1140 |
|
|
else |
1141 |
|
|
x = null; |
1142 |
|
|
if (x == null && (s instanceof AltResult)) |
1143 |
|
|
x = ((AltResult)s).ex; |
1144 |
|
|
if (x == null) { |
1145 |
|
|
if (c != null && !c.claim()) |
1146 |
|
|
return false; |
1147 |
|
|
else |
1148 |
|
|
f.run(); |
1149 |
|
|
} |
1150 |
|
|
} catch (Throwable ex) { |
1151 |
|
|
x = ex; |
1152 |
dl |
1.88 |
} |
1153 |
dl |
1.113 |
internalComplete(encodeOutcome(null, x)); |
1154 |
dl |
1.88 |
} |
1155 |
dl |
1.113 |
return true; |
1156 |
dl |
1.104 |
} |
1157 |
|
|
|
1158 |
dl |
1.113 |
private CompletableFuture<Void> biRunStage(Executor e, CompletionStage<?> o, |
1159 |
|
|
Runnable f) { |
1160 |
|
|
CompletableFuture<?> b; |
1161 |
|
|
if (f == null || (b = o.toCompletableFuture()) == null) |
1162 |
|
|
throw new NullPointerException(); |
1163 |
dl |
1.104 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1164 |
dl |
1.113 |
if (e != null || !d.biRun(this, b, f, null)) { |
1165 |
|
|
BiRun c = new BiRun(e, d, this, b, f); |
1166 |
|
|
bipush(b, c); |
1167 |
|
|
c.tryFire(SYNC); |
1168 |
dl |
1.104 |
} |
1169 |
|
|
return d; |
1170 |
|
|
} |
1171 |
|
|
|
1172 |
dl |
1.113 |
@SuppressWarnings("serial") |
1173 |
|
|
static final class BiRelay extends BiCompletion<Void> { // for And |
1174 |
|
|
BiRelay(CompletableFuture<Void> dep, CompletableFuture<?> src, |
1175 |
|
|
CompletableFuture<?> snd) { |
1176 |
|
|
super(null, dep, src, snd); |
1177 |
|
|
} |
1178 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
1179 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a, b; |
1180 |
|
|
if ((d = dep) == null || !d.biRelay(a = src, b = snd)) |
1181 |
|
|
return null; |
1182 |
|
|
snd = src = null; dep = null; |
1183 |
|
|
return d.postFire(a, b, mode); |
1184 |
|
|
} |
1185 |
|
|
} |
1186 |
dl |
1.104 |
|
1187 |
dl |
1.113 |
private boolean biRelay(CompletableFuture<?> a, CompletableFuture<?> b) { |
1188 |
|
|
Object r, s; Throwable x; |
1189 |
|
|
if (a == null || (r = a.result) == null || |
1190 |
|
|
b == null || (s = b.result) == null) |
1191 |
|
|
return false; |
1192 |
|
|
if (result == null) { |
1193 |
|
|
if (r instanceof AltResult) |
1194 |
|
|
x = ((AltResult)r).ex; |
1195 |
|
|
else |
1196 |
|
|
x = null; |
1197 |
dl |
1.104 |
if (x == null && (s instanceof AltResult)) |
1198 |
|
|
x = ((AltResult)s).ex; |
1199 |
dl |
1.113 |
internalComplete(encodeOutcome(null, x)); |
1200 |
dl |
1.88 |
} |
1201 |
dl |
1.113 |
return true; |
1202 |
dl |
1.104 |
} |
1203 |
|
|
|
1204 |
jsr166 |
1.117 |
/** Recursively constructs a tree of completions. */ |
1205 |
dl |
1.113 |
static CompletableFuture<Void> andTree(CompletableFuture<?>[] cfs, |
1206 |
|
|
int lo, int hi) { |
1207 |
dl |
1.104 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1208 |
|
|
if (lo > hi) // empty |
1209 |
|
|
d.result = NIL; |
1210 |
dl |
1.101 |
else { |
1211 |
dl |
1.113 |
CompletableFuture<?> a, b; |
1212 |
dl |
1.104 |
int mid = (lo + hi) >>> 1; |
1213 |
dl |
1.113 |
if ((a = (lo == mid ? cfs[lo] : |
1214 |
|
|
andTree(cfs, lo, mid))) == null || |
1215 |
|
|
(b = (lo == hi ? a : (hi == mid+1) ? cfs[hi] : |
1216 |
|
|
andTree(cfs, mid+1, hi))) == null) |
1217 |
|
|
throw new NullPointerException(); |
1218 |
|
|
if (!d.biRelay(a, b)) { |
1219 |
|
|
BiRelay c = new BiRelay(d, a, b); |
1220 |
|
|
a.bipush(b, c); |
1221 |
|
|
c.tryFire(SYNC); |
1222 |
dl |
1.88 |
} |
1223 |
|
|
} |
1224 |
dl |
1.104 |
return d; |
1225 |
dl |
1.88 |
} |
1226 |
|
|
|
1227 |
dl |
1.113 |
/* ------------- Projected (Ored) BiCompletions -------------- */ |
1228 |
dl |
1.104 |
|
1229 |
dl |
1.113 |
/** Pushes completion to this and b unless either done. */ |
1230 |
|
|
final void orpush(CompletableFuture<?> b, BiCompletion<?> c) { |
1231 |
|
|
if (c != null) { |
1232 |
|
|
while ((b == null || b.result == null) && result == null) { |
1233 |
|
|
if (casStack(c.next = stack, c)) { |
1234 |
|
|
if (b != null && b != this && b.result == null) { |
1235 |
|
|
Completion q = new CoCompletion(c); |
1236 |
|
|
while (result == null && b.result == null && |
1237 |
|
|
!b.casStack(q.next = b.stack, q)) |
1238 |
|
|
q.next = null; |
1239 |
|
|
} |
1240 |
dl |
1.104 |
break; |
1241 |
dl |
1.88 |
} |
1242 |
dl |
1.104 |
c.next = null; |
1243 |
dl |
1.88 |
} |
1244 |
|
|
} |
1245 |
dl |
1.104 |
} |
1246 |
|
|
|
1247 |
dl |
1.113 |
@SuppressWarnings("serial") |
1248 |
|
|
static final class OrApply<T,U> extends BiCompletion<U> { |
1249 |
|
|
Function<? super T,? extends U> fn; |
1250 |
|
|
OrApply(Executor executor, CompletableFuture<U> dep, |
1251 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, |
1252 |
|
|
Function<? super T,? extends U> fn) { |
1253 |
|
|
super(executor, dep, src, snd); this.fn = fn; |
1254 |
|
|
} |
1255 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
1256 |
|
|
CompletableFuture<U> d; CompletableFuture<?> a, b; |
1257 |
|
|
if ((d = dep) == null || |
1258 |
|
|
!d.orApply(a = src, b = snd, fn, mode > 0 ? null : this)) |
1259 |
|
|
return null; |
1260 |
|
|
dep = null; snd = src = null; fn = null; |
1261 |
|
|
return d.postFire(a, b, mode); |
1262 |
|
|
} |
1263 |
|
|
} |
1264 |
dl |
1.104 |
|
1265 |
dl |
1.113 |
final <S> boolean orApply(CompletableFuture<?> a, CompletableFuture<?> b, |
1266 |
|
|
Function<? super S, ? extends T> f, |
1267 |
|
|
OrApply<S,T> c) { |
1268 |
|
|
Object r; T u; Throwable x; |
1269 |
|
|
if (a == null || b == null || |
1270 |
|
|
((r = a.result) == null && (r = b.result) == null) || f == null) |
1271 |
|
|
return false; |
1272 |
|
|
if (result == null) { |
1273 |
|
|
try { |
1274 |
|
|
if (r instanceof AltResult) { |
1275 |
|
|
x = ((AltResult)r).ex; |
1276 |
|
|
r = null; |
1277 |
|
|
} |
1278 |
|
|
else |
1279 |
|
|
x = null; |
1280 |
|
|
if (x != null) |
1281 |
|
|
u = null; |
1282 |
|
|
else if (c != null && !c.claim()) |
1283 |
|
|
return false; |
1284 |
|
|
else { |
1285 |
|
|
@SuppressWarnings("unchecked") S t = (S) r; |
1286 |
|
|
u = f.apply(t); |
1287 |
|
|
} |
1288 |
|
|
} catch (Throwable ex) { |
1289 |
|
|
x = ex; |
1290 |
|
|
u = null; |
1291 |
dl |
1.88 |
} |
1292 |
dl |
1.113 |
internalComplete(encodeOutcome(u, x)); |
1293 |
dl |
1.88 |
} |
1294 |
dl |
1.113 |
return true; |
1295 |
dl |
1.88 |
} |
1296 |
|
|
|
1297 |
dl |
1.113 |
private <T,U> CompletableFuture<U> orApplyStage( |
1298 |
|
|
Executor e, CompletionStage<? extends T> o, Function<? super T, U> f) { |
1299 |
|
|
CompletableFuture<?> b; |
1300 |
|
|
if (f == null || (b = o.toCompletableFuture()) == null) |
1301 |
|
|
throw new NullPointerException(); |
1302 |
dl |
1.104 |
CompletableFuture<U> d = new CompletableFuture<U>(); |
1303 |
dl |
1.113 |
if (e != null || !d.orApply(this, b, f, null)) { |
1304 |
|
|
OrApply<T,U> c = new OrApply<T,U>(e, d, this, b, f); |
1305 |
|
|
orpush(b, c); |
1306 |
|
|
c.tryFire(SYNC); |
1307 |
|
|
} |
1308 |
|
|
return d; |
1309 |
|
|
} |
1310 |
|
|
|
1311 |
|
|
@SuppressWarnings("serial") |
1312 |
|
|
static final class OrAccept<T> extends BiCompletion<Void> { |
1313 |
|
|
Consumer<? super T> fn; |
1314 |
|
|
OrAccept(Executor executor, CompletableFuture<Void> dep, |
1315 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, |
1316 |
|
|
Consumer<? super T> fn) { |
1317 |
|
|
super(executor, dep, src, snd); this.fn = fn; |
1318 |
|
|
} |
1319 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
1320 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a, b; |
1321 |
|
|
if ((d = dep) == null || |
1322 |
|
|
!d.orAccept(a = src, b = snd, fn, mode > 0 ? null : this)) |
1323 |
|
|
return null; |
1324 |
|
|
dep = null; snd = src = null; fn = null; |
1325 |
|
|
return d.postFire(a, b, mode); |
1326 |
|
|
} |
1327 |
|
|
} |
1328 |
|
|
|
1329 |
|
|
final <S> boolean orAccept(CompletableFuture<?> a, |
1330 |
|
|
CompletableFuture<?> b, |
1331 |
|
|
Consumer<? super S> f, OrAccept<S> c) { |
1332 |
|
|
Object r; Throwable x; |
1333 |
|
|
if (a == null || b == null || |
1334 |
|
|
((r = a.result) == null && (r = b.result) == null) || f == null) |
1335 |
|
|
return false; |
1336 |
|
|
if (result == null) { |
1337 |
|
|
try { |
1338 |
|
|
if (r instanceof AltResult) { |
1339 |
|
|
x = ((AltResult)r).ex; |
1340 |
|
|
r = null; |
1341 |
|
|
} |
1342 |
|
|
else |
1343 |
|
|
x = null; |
1344 |
|
|
if (x == null) { |
1345 |
|
|
if (c != null && !c.claim()) |
1346 |
|
|
return false; |
1347 |
|
|
else { |
1348 |
|
|
@SuppressWarnings("unchecked") S t = (S) r; |
1349 |
|
|
f.accept(t); |
1350 |
|
|
} |
1351 |
|
|
} |
1352 |
|
|
} catch (Throwable ex) { |
1353 |
|
|
x = ex; |
1354 |
|
|
} |
1355 |
|
|
internalComplete(encodeOutcome(null, x)); |
1356 |
|
|
} |
1357 |
|
|
return true; |
1358 |
|
|
} |
1359 |
|
|
|
1360 |
|
|
private CompletableFuture<Void> orAcceptStage( |
1361 |
|
|
Executor e, CompletionStage<? extends T> o, Consumer<? super T> f) { |
1362 |
|
|
CompletableFuture<?> b; |
1363 |
|
|
if (f == null || (b = o.toCompletableFuture()) == null) |
1364 |
|
|
throw new NullPointerException(); |
1365 |
|
|
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1366 |
|
|
if (e != null || !d.orAccept(this, b, f, null)) { |
1367 |
|
|
OrAccept<T> c = new OrAccept<T>(e, d, this, b, f); |
1368 |
|
|
orpush(b, c); |
1369 |
|
|
c.tryFire(SYNC); |
1370 |
|
|
} |
1371 |
dl |
1.104 |
return d; |
1372 |
|
|
} |
1373 |
|
|
|
1374 |
dl |
1.113 |
@SuppressWarnings("serial") |
1375 |
|
|
static final class OrRun extends BiCompletion<Void> { |
1376 |
|
|
Runnable fn; |
1377 |
|
|
OrRun(Executor executor, CompletableFuture<Void> dep, |
1378 |
|
|
CompletableFuture<?> src, CompletableFuture<?> snd, Runnable fn) { |
1379 |
|
|
super(executor, dep, src, snd); this.fn = fn; |
1380 |
|
|
} |
1381 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
1382 |
|
|
CompletableFuture<Void> d; CompletableFuture<?> a, b; |
1383 |
|
|
if ((d = dep) == null || |
1384 |
|
|
!d.orRun(a = src, b = snd, fn, mode > 0 ? null : this)) |
1385 |
|
|
return null; |
1386 |
|
|
dep = null; snd = src = null; fn = null; |
1387 |
|
|
return d.postFire(a, b, mode); |
1388 |
|
|
} |
1389 |
|
|
} |
1390 |
dl |
1.104 |
|
1391 |
dl |
1.113 |
final boolean orRun(CompletableFuture<?> a, CompletableFuture<?> b, |
1392 |
|
|
Runnable f, OrRun c) { |
1393 |
|
|
Object r; Throwable x; |
1394 |
|
|
if (a == null || b == null || |
1395 |
|
|
((r = a.result) == null && (r = b.result) == null) || f == null) |
1396 |
|
|
return false; |
1397 |
|
|
if (result == null) { |
1398 |
|
|
try { |
1399 |
|
|
if (r instanceof AltResult) |
1400 |
|
|
x = ((AltResult)r).ex; |
1401 |
|
|
else |
1402 |
|
|
x = null; |
1403 |
|
|
if (x == null) { |
1404 |
|
|
if (c != null && !c.claim()) |
1405 |
|
|
return false; |
1406 |
|
|
else |
1407 |
|
|
f.run(); |
1408 |
|
|
} |
1409 |
|
|
} catch (Throwable ex) { |
1410 |
|
|
x = ex; |
1411 |
dl |
1.88 |
} |
1412 |
dl |
1.113 |
internalComplete(encodeOutcome(null, x)); |
1413 |
dl |
1.88 |
} |
1414 |
dl |
1.113 |
return true; |
1415 |
dl |
1.104 |
} |
1416 |
|
|
|
1417 |
dl |
1.113 |
private CompletableFuture<Void> orRunStage(Executor e, CompletionStage<?> o, |
1418 |
|
|
Runnable f) { |
1419 |
|
|
CompletableFuture<?> b; |
1420 |
|
|
if (f == null || (b = o.toCompletableFuture()) == null) |
1421 |
|
|
throw new NullPointerException(); |
1422 |
dl |
1.104 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1423 |
dl |
1.113 |
if (e != null || !d.orRun(this, b, f, null)) { |
1424 |
|
|
OrRun c = new OrRun(e, d, this, b, f); |
1425 |
|
|
orpush(b, c); |
1426 |
|
|
c.tryFire(SYNC); |
1427 |
|
|
} |
1428 |
|
|
return d; |
1429 |
|
|
} |
1430 |
|
|
|
1431 |
|
|
@SuppressWarnings("serial") |
1432 |
|
|
static final class OrRelay extends BiCompletion<Object> { // for Or |
1433 |
|
|
OrRelay(CompletableFuture<Object> dep, CompletableFuture<?> src, |
1434 |
|
|
CompletableFuture<?> snd) { |
1435 |
|
|
super(null, dep, src, snd); |
1436 |
|
|
} |
1437 |
|
|
final CompletableFuture<?> tryFire(int mode) { |
1438 |
|
|
CompletableFuture<Object> d; CompletableFuture<?> a, b; |
1439 |
|
|
if ((d = dep) == null || !d.orRelay(a = src, b = snd)) |
1440 |
|
|
return null; |
1441 |
|
|
snd = src = null; dep = null; |
1442 |
|
|
return d.postFire(a, b, mode); |
1443 |
|
|
} |
1444 |
|
|
} |
1445 |
|
|
|
1446 |
|
|
final boolean orRelay(CompletableFuture<?> a, CompletableFuture<?> b) { |
1447 |
|
|
Object r; |
1448 |
|
|
if (a == null || b == null || |
1449 |
|
|
((r = a.result) == null && (r = b.result) == null)) |
1450 |
|
|
return false; |
1451 |
|
|
Object s = encodeRelay(r); |
1452 |
|
|
if (result == null) |
1453 |
|
|
internalComplete(s); |
1454 |
|
|
return true; |
1455 |
|
|
} |
1456 |
|
|
|
1457 |
jsr166 |
1.118 |
/** Recursively constructs a tree of completions. */ |
1458 |
dl |
1.113 |
static CompletableFuture<Object> orTree(CompletableFuture<?>[] cfs, |
1459 |
|
|
int lo, int hi) { |
1460 |
|
|
CompletableFuture<Object> d = new CompletableFuture<Object>(); |
1461 |
|
|
if (lo <= hi) { |
1462 |
|
|
CompletableFuture<?> a, b; |
1463 |
|
|
int mid = (lo + hi) >>> 1; |
1464 |
|
|
if ((a = (lo == mid ? cfs[lo] : |
1465 |
|
|
orTree(cfs, lo, mid))) == null || |
1466 |
|
|
(b = (lo == hi ? a : (hi == mid+1) ? cfs[hi] : |
1467 |
|
|
orTree(cfs, mid+1, hi))) == null) |
1468 |
|
|
throw new NullPointerException(); |
1469 |
|
|
if (!d.orRelay(a, b)) { |
1470 |
|
|
OrRelay c = new OrRelay(d, a, b); |
1471 |
|
|
a.orpush(b, c); |
1472 |
|
|
c.tryFire(SYNC); |
1473 |
|
|
} |
1474 |
|
|
} |
1475 |
dl |
1.104 |
return d; |
1476 |
|
|
} |
1477 |
|
|
|
1478 |
dl |
1.113 |
/* ------------- Zero-input Async forms -------------- */ |
1479 |
dl |
1.104 |
|
1480 |
dl |
1.113 |
@SuppressWarnings("serial") |
1481 |
|
|
static final class AsyncSupply<T> extends Completion { |
1482 |
|
|
CompletableFuture<T> dep; Supplier<T> fn; |
1483 |
|
|
AsyncSupply(CompletableFuture<T> dep, Supplier<T> fn) { |
1484 |
|
|
this.dep = dep; this.fn = fn; |
1485 |
|
|
} |
1486 |
|
|
|
1487 |
|
|
final CompletableFuture<?> tryFire(int alwaysAsync) { |
1488 |
|
|
CompletableFuture<T> d; Supplier<T> f; |
1489 |
|
|
if ((d = dep) != null && (f = fn) != null) { |
1490 |
|
|
dep = null; fn = null; |
1491 |
|
|
if (d.result == null) { |
1492 |
|
|
T t; Throwable x; |
1493 |
|
|
try { |
1494 |
|
|
t = f.get(); |
1495 |
|
|
x = null; |
1496 |
|
|
} catch (Throwable ex) { |
1497 |
|
|
x = ex; |
1498 |
|
|
t = null; |
1499 |
|
|
} |
1500 |
|
|
d.internalComplete(encodeOutcome(t, x)); |
1501 |
|
|
} |
1502 |
|
|
d.postComplete(); |
1503 |
|
|
} |
1504 |
|
|
return d; |
1505 |
|
|
} |
1506 |
|
|
final boolean isLive() { return dep != null; } |
1507 |
|
|
} |
1508 |
|
|
|
1509 |
|
|
static <U> CompletableFuture<U> asyncSupplyStage(Executor e, |
1510 |
|
|
Supplier<U> f) { |
1511 |
|
|
if (f == null) throw new NullPointerException(); |
1512 |
|
|
CompletableFuture<U> d = new CompletableFuture<U>(); |
1513 |
|
|
e.execute(new AsyncSupply<U>(d, f)); |
1514 |
|
|
return d; |
1515 |
|
|
} |
1516 |
|
|
|
1517 |
|
|
@SuppressWarnings("serial") |
1518 |
|
|
static final class AsyncRun extends Completion { |
1519 |
|
|
CompletableFuture<Void> dep; Runnable fn; |
1520 |
|
|
AsyncRun(CompletableFuture<Void> dep, Runnable fn) { |
1521 |
|
|
this.dep = dep; this.fn = fn; |
1522 |
|
|
} |
1523 |
|
|
|
1524 |
|
|
final CompletableFuture<?> tryFire(int alwaysAsync) { |
1525 |
|
|
CompletableFuture<Void> d; Runnable f; |
1526 |
|
|
if ((d = dep) != null && (f = fn) != null) { |
1527 |
|
|
dep = null; fn = null; |
1528 |
|
|
if (d.result == null) { |
1529 |
|
|
Throwable x; |
1530 |
|
|
try { |
1531 |
|
|
f.run(); |
1532 |
|
|
x = null; |
1533 |
|
|
} catch (Throwable ex) { |
1534 |
|
|
x = ex; |
1535 |
|
|
} |
1536 |
|
|
d.internalComplete(encodeOutcome(null, x)); |
1537 |
|
|
} |
1538 |
|
|
d.postComplete(); |
1539 |
dl |
1.88 |
} |
1540 |
dl |
1.113 |
return d; |
1541 |
dl |
1.88 |
} |
1542 |
dl |
1.113 |
final boolean isLive() { return dep != null; } |
1543 |
dl |
1.88 |
} |
1544 |
|
|
|
1545 |
dl |
1.113 |
static CompletableFuture<Void> asyncRunStage(Executor e, Runnable f) { |
1546 |
|
|
if (f == null) throw new NullPointerException(); |
1547 |
dl |
1.104 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1548 |
dl |
1.113 |
e.execute(new AsyncRun(d, f)); |
1549 |
dl |
1.104 |
return d; |
1550 |
|
|
} |
1551 |
|
|
|
1552 |
|
|
/* ------------- Signallers -------------- */ |
1553 |
|
|
|
1554 |
|
|
/** |
1555 |
dl |
1.113 |
* Completion for recording and releasing a waiting thread. This |
1556 |
|
|
* class implements ManagedBlocker to avoid starvation when |
1557 |
|
|
* blocking actions pile up in ForkJoinPools. |
1558 |
dl |
1.104 |
*/ |
1559 |
dl |
1.113 |
@SuppressWarnings("serial") |
1560 |
dl |
1.110 |
static final class Signaller extends Completion |
1561 |
dl |
1.104 |
implements ForkJoinPool.ManagedBlocker { |
1562 |
dl |
1.113 |
long nanos; // wait time if timed |
1563 |
|
|
final long deadline; // non-zero if timed |
1564 |
dl |
1.104 |
volatile int interruptControl; // > 0: interruptible, < 0: interrupted |
1565 |
|
|
volatile Thread thread; |
1566 |
dl |
1.113 |
|
1567 |
dl |
1.104 |
Signaller(boolean interruptible, long nanos, long deadline) { |
1568 |
|
|
this.thread = Thread.currentThread(); |
1569 |
|
|
this.interruptControl = interruptible ? 1 : 0; |
1570 |
|
|
this.nanos = nanos; |
1571 |
|
|
this.deadline = deadline; |
1572 |
|
|
} |
1573 |
dl |
1.113 |
final CompletableFuture<?> tryFire(int ignore) { |
1574 |
|
|
Thread w; // no need to atomically claim |
1575 |
|
|
if ((w = thread) != null) { |
1576 |
|
|
thread = null; |
1577 |
dl |
1.104 |
LockSupport.unpark(w); |
1578 |
dl |
1.88 |
} |
1579 |
dl |
1.104 |
return null; |
1580 |
dl |
1.88 |
} |
1581 |
dl |
1.104 |
public boolean isReleasable() { |
1582 |
|
|
if (thread == null) |
1583 |
|
|
return true; |
1584 |
|
|
if (Thread.interrupted()) { |
1585 |
|
|
int i = interruptControl; |
1586 |
|
|
interruptControl = -1; |
1587 |
|
|
if (i > 0) |
1588 |
|
|
return true; |
1589 |
dl |
1.88 |
} |
1590 |
dl |
1.104 |
if (deadline != 0L && |
1591 |
|
|
(nanos <= 0L || (nanos = deadline - System.nanoTime()) <= 0L)) { |
1592 |
|
|
thread = null; |
1593 |
|
|
return true; |
1594 |
dl |
1.88 |
} |
1595 |
dl |
1.104 |
return false; |
1596 |
|
|
} |
1597 |
|
|
public boolean block() { |
1598 |
|
|
if (isReleasable()) |
1599 |
|
|
return true; |
1600 |
|
|
else if (deadline == 0L) |
1601 |
|
|
LockSupport.park(this); |
1602 |
|
|
else if (nanos > 0L) |
1603 |
|
|
LockSupport.parkNanos(this, nanos); |
1604 |
|
|
return isReleasable(); |
1605 |
dl |
1.88 |
} |
1606 |
dl |
1.113 |
final boolean isLive() { return thread != null; } |
1607 |
dl |
1.88 |
} |
1608 |
|
|
|
1609 |
dl |
1.104 |
/** |
1610 |
|
|
* Returns raw result after waiting, or null if interruptible and |
1611 |
|
|
* interrupted. |
1612 |
|
|
*/ |
1613 |
|
|
private Object waitingGet(boolean interruptible) { |
1614 |
|
|
Signaller q = null; |
1615 |
|
|
boolean queued = false; |
1616 |
dl |
1.113 |
int spins = -1; |
1617 |
dl |
1.88 |
Object r; |
1618 |
dl |
1.104 |
while ((r = result) == null) { |
1619 |
dl |
1.113 |
if (spins < 0) |
1620 |
|
|
spins = (Runtime.getRuntime().availableProcessors() > 1) ? |
1621 |
|
|
1 << 8 : 0; // Use brief spin-wait on multiprocessors |
1622 |
|
|
else if (spins > 0) { |
1623 |
dl |
1.104 |
if (ThreadLocalRandom.nextSecondarySeed() >= 0) |
1624 |
|
|
--spins; |
1625 |
dl |
1.88 |
} |
1626 |
dl |
1.104 |
else if (q == null) |
1627 |
|
|
q = new Signaller(interruptible, 0L, 0L); |
1628 |
|
|
else if (!queued) |
1629 |
dl |
1.113 |
queued = casStack(q.next = stack, q); |
1630 |
dl |
1.104 |
else if (interruptible && q.interruptControl < 0) { |
1631 |
|
|
q.thread = null; |
1632 |
dl |
1.113 |
cleanStack(); |
1633 |
dl |
1.104 |
return null; |
1634 |
dl |
1.88 |
} |
1635 |
dl |
1.104 |
else if (q.thread != null && result == null) { |
1636 |
|
|
try { |
1637 |
|
|
ForkJoinPool.managedBlock(q); |
1638 |
|
|
} catch (InterruptedException ie) { |
1639 |
|
|
q.interruptControl = -1; |
1640 |
|
|
} |
1641 |
dl |
1.88 |
} |
1642 |
dl |
1.104 |
} |
1643 |
|
|
if (q != null) { |
1644 |
|
|
q.thread = null; |
1645 |
|
|
if (q.interruptControl < 0) { |
1646 |
|
|
if (interruptible) |
1647 |
|
|
r = null; // report interruption |
1648 |
dl |
1.88 |
else |
1649 |
dl |
1.104 |
Thread.currentThread().interrupt(); |
1650 |
dl |
1.88 |
} |
1651 |
|
|
} |
1652 |
dl |
1.104 |
postComplete(); |
1653 |
|
|
return r; |
1654 |
dl |
1.88 |
} |
1655 |
|
|
|
1656 |
dl |
1.104 |
/** |
1657 |
|
|
* Returns raw result after waiting, or null if interrupted, or |
1658 |
|
|
* throws TimeoutException on timeout. |
1659 |
|
|
*/ |
1660 |
|
|
private Object timedGet(long nanos) throws TimeoutException { |
1661 |
|
|
if (Thread.interrupted()) |
1662 |
|
|
return null; |
1663 |
|
|
if (nanos <= 0L) |
1664 |
|
|
throw new TimeoutException(); |
1665 |
|
|
long d = System.nanoTime() + nanos; |
1666 |
|
|
Signaller q = new Signaller(true, nanos, d == 0L ? 1L : d); // avoid 0 |
1667 |
|
|
boolean queued = false; |
1668 |
dl |
1.88 |
Object r; |
1669 |
dl |
1.104 |
while ((r = result) == null) { |
1670 |
|
|
if (!queued) |
1671 |
dl |
1.113 |
queued = casStack(q.next = stack, q); |
1672 |
dl |
1.104 |
else if (q.interruptControl < 0 || q.nanos <= 0L) { |
1673 |
|
|
q.thread = null; |
1674 |
dl |
1.113 |
cleanStack(); |
1675 |
dl |
1.104 |
if (q.interruptControl < 0) |
1676 |
|
|
return null; |
1677 |
|
|
throw new TimeoutException(); |
1678 |
|
|
} |
1679 |
|
|
else if (q.thread != null && result == null) { |
1680 |
|
|
try { |
1681 |
|
|
ForkJoinPool.managedBlock(q); |
1682 |
|
|
} catch (InterruptedException ie) { |
1683 |
|
|
q.interruptControl = -1; |
1684 |
|
|
} |
1685 |
dl |
1.88 |
} |
1686 |
|
|
} |
1687 |
dl |
1.113 |
if (q.interruptControl < 0) |
1688 |
|
|
r = null; |
1689 |
dl |
1.104 |
q.thread = null; |
1690 |
|
|
postComplete(); |
1691 |
dl |
1.113 |
return r; |
1692 |
dl |
1.88 |
} |
1693 |
|
|
|
1694 |
dl |
1.104 |
/* ------------- public methods -------------- */ |
1695 |
dl |
1.88 |
|
1696 |
|
|
/** |
1697 |
|
|
* Creates a new incomplete CompletableFuture. |
1698 |
|
|
*/ |
1699 |
|
|
public CompletableFuture() { |
1700 |
|
|
} |
1701 |
|
|
|
1702 |
|
|
/** |
1703 |
|
|
* Returns a new CompletableFuture that is asynchronously completed |
1704 |
|
|
* by a task running in the {@link ForkJoinPool#commonPool()} with |
1705 |
|
|
* the value obtained by calling the given Supplier. |
1706 |
|
|
* |
1707 |
|
|
* @param supplier a function returning the value to be used |
1708 |
|
|
* to complete the returned CompletableFuture |
1709 |
jsr166 |
1.95 |
* @param <U> the function's return type |
1710 |
dl |
1.88 |
* @return the new CompletableFuture |
1711 |
|
|
*/ |
1712 |
|
|
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier) { |
1713 |
dl |
1.113 |
return asyncSupplyStage(asyncPool, supplier); |
1714 |
dl |
1.88 |
} |
1715 |
|
|
|
1716 |
|
|
/** |
1717 |
|
|
* Returns a new CompletableFuture that is asynchronously completed |
1718 |
|
|
* by a task running in the given executor with the value obtained |
1719 |
|
|
* by calling the given Supplier. |
1720 |
|
|
* |
1721 |
|
|
* @param supplier a function returning the value to be used |
1722 |
|
|
* to complete the returned CompletableFuture |
1723 |
|
|
* @param executor the executor to use for asynchronous execution |
1724 |
jsr166 |
1.95 |
* @param <U> the function's return type |
1725 |
dl |
1.88 |
* @return the new CompletableFuture |
1726 |
|
|
*/ |
1727 |
|
|
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier, |
1728 |
|
|
Executor executor) { |
1729 |
dl |
1.113 |
return asyncSupplyStage(screenExecutor(executor), supplier); |
1730 |
dl |
1.28 |
} |
1731 |
|
|
|
1732 |
|
|
/** |
1733 |
jsr166 |
1.66 |
* Returns a new CompletableFuture that is asynchronously completed |
1734 |
|
|
* by a task running in the {@link ForkJoinPool#commonPool()} after |
1735 |
|
|
* it runs the given action. |
1736 |
dl |
1.28 |
* |
1737 |
|
|
* @param runnable the action to run before completing the |
1738 |
|
|
* returned CompletableFuture |
1739 |
jsr166 |
1.58 |
* @return the new CompletableFuture |
1740 |
dl |
1.28 |
*/ |
1741 |
|
|
public static CompletableFuture<Void> runAsync(Runnable runnable) { |
1742 |
dl |
1.113 |
return asyncRunStage(asyncPool, runnable); |
1743 |
dl |
1.28 |
} |
1744 |
|
|
|
1745 |
|
|
/** |
1746 |
jsr166 |
1.66 |
* Returns a new CompletableFuture that is asynchronously completed |
1747 |
|
|
* by a task running in the given executor after it runs the given |
1748 |
|
|
* action. |
1749 |
dl |
1.28 |
* |
1750 |
|
|
* @param runnable the action to run before completing the |
1751 |
|
|
* returned CompletableFuture |
1752 |
|
|
* @param executor the executor to use for asynchronous execution |
1753 |
jsr166 |
1.58 |
* @return the new CompletableFuture |
1754 |
dl |
1.28 |
*/ |
1755 |
|
|
public static CompletableFuture<Void> runAsync(Runnable runnable, |
1756 |
|
|
Executor executor) { |
1757 |
dl |
1.113 |
return asyncRunStage(screenExecutor(executor), runnable); |
1758 |
dl |
1.28 |
} |
1759 |
|
|
|
1760 |
|
|
/** |
1761 |
dl |
1.77 |
* Returns a new CompletableFuture that is already completed with |
1762 |
|
|
* the given value. |
1763 |
|
|
* |
1764 |
|
|
* @param value the value |
1765 |
jsr166 |
1.95 |
* @param <U> the type of the value |
1766 |
dl |
1.77 |
* @return the completed CompletableFuture |
1767 |
|
|
*/ |
1768 |
|
|
public static <U> CompletableFuture<U> completedFuture(U value) { |
1769 |
dl |
1.104 |
CompletableFuture<U> d = new CompletableFuture<U>(); |
1770 |
|
|
d.result = (value == null) ? NIL : value; |
1771 |
|
|
return d; |
1772 |
dl |
1.77 |
} |
1773 |
|
|
|
1774 |
|
|
/** |
1775 |
dl |
1.28 |
* Returns {@code true} if completed in any fashion: normally, |
1776 |
|
|
* exceptionally, or via cancellation. |
1777 |
|
|
* |
1778 |
|
|
* @return {@code true} if completed |
1779 |
|
|
*/ |
1780 |
|
|
public boolean isDone() { |
1781 |
|
|
return result != null; |
1782 |
|
|
} |
1783 |
|
|
|
1784 |
|
|
/** |
1785 |
dl |
1.49 |
* Waits if necessary for this future to complete, and then |
1786 |
dl |
1.48 |
* returns its result. |
1787 |
dl |
1.28 |
* |
1788 |
dl |
1.48 |
* @return the result value |
1789 |
|
|
* @throws CancellationException if this future was cancelled |
1790 |
|
|
* @throws ExecutionException if this future completed exceptionally |
1791 |
dl |
1.28 |
* @throws InterruptedException if the current thread was interrupted |
1792 |
|
|
* while waiting |
1793 |
|
|
*/ |
1794 |
|
|
public T get() throws InterruptedException, ExecutionException { |
1795 |
jsr166 |
1.105 |
Object r; |
1796 |
jsr166 |
1.121 |
return reportGet((r = result) == null ? waitingGet(true) : r); |
1797 |
dl |
1.28 |
} |
1798 |
|
|
|
1799 |
|
|
/** |
1800 |
dl |
1.49 |
* Waits if necessary for at most the given time for this future |
1801 |
|
|
* to complete, and then returns its result, if available. |
1802 |
dl |
1.28 |
* |
1803 |
|
|
* @param timeout the maximum time to wait |
1804 |
|
|
* @param unit the time unit of the timeout argument |
1805 |
dl |
1.48 |
* @return the result value |
1806 |
|
|
* @throws CancellationException if this future was cancelled |
1807 |
|
|
* @throws ExecutionException if this future completed exceptionally |
1808 |
dl |
1.28 |
* @throws InterruptedException if the current thread was interrupted |
1809 |
|
|
* while waiting |
1810 |
|
|
* @throws TimeoutException if the wait timed out |
1811 |
|
|
*/ |
1812 |
|
|
public T get(long timeout, TimeUnit unit) |
1813 |
|
|
throws InterruptedException, ExecutionException, TimeoutException { |
1814 |
jsr166 |
1.105 |
Object r; |
1815 |
dl |
1.28 |
long nanos = unit.toNanos(timeout); |
1816 |
jsr166 |
1.121 |
return reportGet((r = result) == null ? timedGet(nanos) : r); |
1817 |
dl |
1.28 |
} |
1818 |
|
|
|
1819 |
|
|
/** |
1820 |
|
|
* Returns the result value when complete, or throws an |
1821 |
|
|
* (unchecked) exception if completed exceptionally. To better |
1822 |
|
|
* conform with the use of common functional forms, if a |
1823 |
|
|
* computation involved in the completion of this |
1824 |
|
|
* CompletableFuture threw an exception, this method throws an |
1825 |
|
|
* (unchecked) {@link CompletionException} with the underlying |
1826 |
|
|
* exception as its cause. |
1827 |
|
|
* |
1828 |
|
|
* @return the result value |
1829 |
|
|
* @throws CancellationException if the computation was cancelled |
1830 |
jsr166 |
1.55 |
* @throws CompletionException if this future completed |
1831 |
|
|
* exceptionally or a completion computation threw an exception |
1832 |
dl |
1.28 |
*/ |
1833 |
|
|
public T join() { |
1834 |
dl |
1.104 |
Object r; |
1835 |
jsr166 |
1.105 |
return reportJoin((r = result) == null ? waitingGet(false) : r); |
1836 |
dl |
1.28 |
} |
1837 |
|
|
|
1838 |
|
|
/** |
1839 |
|
|
* Returns the result value (or throws any encountered exception) |
1840 |
|
|
* if completed, else returns the given valueIfAbsent. |
1841 |
|
|
* |
1842 |
|
|
* @param valueIfAbsent the value to return if not completed |
1843 |
|
|
* @return the result value, if completed, else the given valueIfAbsent |
1844 |
|
|
* @throws CancellationException if the computation was cancelled |
1845 |
jsr166 |
1.55 |
* @throws CompletionException if this future completed |
1846 |
|
|
* exceptionally or a completion computation threw an exception |
1847 |
dl |
1.28 |
*/ |
1848 |
|
|
public T getNow(T valueIfAbsent) { |
1849 |
dl |
1.104 |
Object r; |
1850 |
jsr166 |
1.106 |
return ((r = result) == null) ? valueIfAbsent : reportJoin(r); |
1851 |
dl |
1.28 |
} |
1852 |
|
|
|
1853 |
|
|
/** |
1854 |
|
|
* If not already completed, sets the value returned by {@link |
1855 |
|
|
* #get()} and related methods to the given value. |
1856 |
|
|
* |
1857 |
|
|
* @param value the result value |
1858 |
|
|
* @return {@code true} if this invocation caused this CompletableFuture |
1859 |
|
|
* to transition to a completed state, else {@code false} |
1860 |
|
|
*/ |
1861 |
|
|
public boolean complete(T value) { |
1862 |
dl |
1.104 |
boolean triggered = internalComplete(value == null ? NIL : value); |
1863 |
|
|
postComplete(); |
1864 |
dl |
1.28 |
return triggered; |
1865 |
|
|
} |
1866 |
|
|
|
1867 |
|
|
/** |
1868 |
|
|
* If not already completed, causes invocations of {@link #get()} |
1869 |
|
|
* and related methods to throw the given exception. |
1870 |
|
|
* |
1871 |
|
|
* @param ex the exception |
1872 |
|
|
* @return {@code true} if this invocation caused this CompletableFuture |
1873 |
|
|
* to transition to a completed state, else {@code false} |
1874 |
|
|
*/ |
1875 |
|
|
public boolean completeExceptionally(Throwable ex) { |
1876 |
|
|
if (ex == null) throw new NullPointerException(); |
1877 |
dl |
1.104 |
boolean triggered = internalComplete(new AltResult(ex)); |
1878 |
|
|
postComplete(); |
1879 |
dl |
1.28 |
return triggered; |
1880 |
|
|
} |
1881 |
|
|
|
1882 |
dl |
1.104 |
public <U> CompletableFuture<U> thenApply( |
1883 |
|
|
Function<? super T,? extends U> fn) { |
1884 |
dl |
1.113 |
return uniApplyStage(null, fn); |
1885 |
dl |
1.28 |
} |
1886 |
|
|
|
1887 |
dl |
1.104 |
public <U> CompletableFuture<U> thenApplyAsync( |
1888 |
|
|
Function<? super T,? extends U> fn) { |
1889 |
dl |
1.113 |
return uniApplyStage(asyncPool, fn); |
1890 |
dl |
1.17 |
} |
1891 |
|
|
|
1892 |
dl |
1.104 |
public <U> CompletableFuture<U> thenApplyAsync( |
1893 |
|
|
Function<? super T,? extends U> fn, Executor executor) { |
1894 |
dl |
1.113 |
return uniApplyStage(screenExecutor(executor), fn); |
1895 |
dl |
1.28 |
} |
1896 |
dl |
1.1 |
|
1897 |
dl |
1.104 |
public CompletableFuture<Void> thenAccept(Consumer<? super T> action) { |
1898 |
dl |
1.113 |
return uniAcceptStage(null, action); |
1899 |
dl |
1.28 |
} |
1900 |
|
|
|
1901 |
dl |
1.104 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> action) { |
1902 |
dl |
1.113 |
return uniAcceptStage(asyncPool, action); |
1903 |
dl |
1.28 |
} |
1904 |
|
|
|
1905 |
dl |
1.113 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> action, |
1906 |
|
|
Executor executor) { |
1907 |
|
|
return uniAcceptStage(screenExecutor(executor), action); |
1908 |
dl |
1.7 |
} |
1909 |
|
|
|
1910 |
dl |
1.104 |
public CompletableFuture<Void> thenRun(Runnable action) { |
1911 |
dl |
1.113 |
return uniRunStage(null, action); |
1912 |
dl |
1.28 |
} |
1913 |
|
|
|
1914 |
dl |
1.104 |
public CompletableFuture<Void> thenRunAsync(Runnable action) { |
1915 |
dl |
1.113 |
return uniRunStage(asyncPool, action); |
1916 |
dl |
1.28 |
} |
1917 |
|
|
|
1918 |
dl |
1.113 |
public CompletableFuture<Void> thenRunAsync(Runnable action, |
1919 |
|
|
Executor executor) { |
1920 |
|
|
return uniRunStage(screenExecutor(executor), action); |
1921 |
dl |
1.28 |
} |
1922 |
|
|
|
1923 |
dl |
1.104 |
public <U,V> CompletableFuture<V> thenCombine( |
1924 |
|
|
CompletionStage<? extends U> other, |
1925 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
1926 |
dl |
1.113 |
return biApplyStage(null, other, fn); |
1927 |
dl |
1.28 |
} |
1928 |
|
|
|
1929 |
dl |
1.104 |
public <U,V> CompletableFuture<V> thenCombineAsync( |
1930 |
|
|
CompletionStage<? extends U> other, |
1931 |
|
|
BiFunction<? super T,? super U,? extends V> fn) { |
1932 |
dl |
1.113 |
return biApplyStage(asyncPool, other, fn); |
1933 |
dl |
1.28 |
} |
1934 |
|
|
|
1935 |
dl |
1.104 |
public <U,V> CompletableFuture<V> thenCombineAsync( |
1936 |
|
|
CompletionStage<? extends U> other, |
1937 |
dl |
1.113 |
BiFunction<? super T,? super U,? extends V> fn, Executor executor) { |
1938 |
|
|
return biApplyStage(screenExecutor(executor), other, fn); |
1939 |
dl |
1.1 |
} |
1940 |
|
|
|
1941 |
dl |
1.104 |
public <U> CompletableFuture<Void> thenAcceptBoth( |
1942 |
|
|
CompletionStage<? extends U> other, |
1943 |
|
|
BiConsumer<? super T, ? super U> action) { |
1944 |
dl |
1.113 |
return biAcceptStage(null, other, action); |
1945 |
dl |
1.28 |
} |
1946 |
|
|
|
1947 |
dl |
1.104 |
public <U> CompletableFuture<Void> thenAcceptBothAsync( |
1948 |
|
|
CompletionStage<? extends U> other, |
1949 |
|
|
BiConsumer<? super T, ? super U> action) { |
1950 |
dl |
1.113 |
return biAcceptStage(asyncPool, other, action); |
1951 |
dl |
1.28 |
} |
1952 |
|
|
|
1953 |
dl |
1.104 |
public <U> CompletableFuture<Void> thenAcceptBothAsync( |
1954 |
|
|
CompletionStage<? extends U> other, |
1955 |
dl |
1.113 |
BiConsumer<? super T, ? super U> action, Executor executor) { |
1956 |
|
|
return biAcceptStage(screenExecutor(executor), other, action); |
1957 |
dl |
1.28 |
} |
1958 |
|
|
|
1959 |
dl |
1.113 |
public CompletableFuture<Void> runAfterBoth(CompletionStage<?> other, |
1960 |
|
|
Runnable action) { |
1961 |
|
|
return biRunStage(null, other, action); |
1962 |
dl |
1.7 |
} |
1963 |
|
|
|
1964 |
dl |
1.113 |
public CompletableFuture<Void> runAfterBothAsync(CompletionStage<?> other, |
1965 |
|
|
Runnable action) { |
1966 |
|
|
return biRunStage(asyncPool, other, action); |
1967 |
dl |
1.28 |
} |
1968 |
|
|
|
1969 |
dl |
1.113 |
public CompletableFuture<Void> runAfterBothAsync(CompletionStage<?> other, |
1970 |
|
|
Runnable action, |
1971 |
|
|
Executor executor) { |
1972 |
|
|
return biRunStage(screenExecutor(executor), other, action); |
1973 |
dl |
1.28 |
} |
1974 |
|
|
|
1975 |
dl |
1.104 |
public <U> CompletableFuture<U> applyToEither( |
1976 |
|
|
CompletionStage<? extends T> other, Function<? super T, U> fn) { |
1977 |
dl |
1.113 |
return orApplyStage(null, other, fn); |
1978 |
dl |
1.28 |
} |
1979 |
|
|
|
1980 |
dl |
1.104 |
public <U> CompletableFuture<U> applyToEitherAsync( |
1981 |
|
|
CompletionStage<? extends T> other, Function<? super T, U> fn) { |
1982 |
dl |
1.113 |
return orApplyStage(asyncPool, other, fn); |
1983 |
dl |
1.28 |
} |
1984 |
|
|
|
1985 |
dl |
1.113 |
public <U> CompletableFuture<U> applyToEitherAsync( |
1986 |
|
|
CompletionStage<? extends T> other, Function<? super T, U> fn, |
1987 |
|
|
Executor executor) { |
1988 |
|
|
return orApplyStage(screenExecutor(executor), other, fn); |
1989 |
dl |
1.1 |
} |
1990 |
|
|
|
1991 |
dl |
1.104 |
public CompletableFuture<Void> acceptEither( |
1992 |
|
|
CompletionStage<? extends T> other, Consumer<? super T> action) { |
1993 |
dl |
1.113 |
return orAcceptStage(null, other, action); |
1994 |
dl |
1.28 |
} |
1995 |
|
|
|
1996 |
dl |
1.113 |
public CompletableFuture<Void> acceptEitherAsync( |
1997 |
|
|
CompletionStage<? extends T> other, Consumer<? super T> action) { |
1998 |
|
|
return orAcceptStage(asyncPool, other, action); |
1999 |
dl |
1.28 |
} |
2000 |
|
|
|
2001 |
dl |
1.104 |
public CompletableFuture<Void> acceptEitherAsync( |
2002 |
|
|
CompletionStage<? extends T> other, Consumer<? super T> action, |
2003 |
|
|
Executor executor) { |
2004 |
dl |
1.113 |
return orAcceptStage(screenExecutor(executor), other, action); |
2005 |
dl |
1.7 |
} |
2006 |
|
|
|
2007 |
dl |
1.113 |
public CompletableFuture<Void> runAfterEither(CompletionStage<?> other, |
2008 |
|
|
Runnable action) { |
2009 |
|
|
return orRunStage(null, other, action); |
2010 |
dl |
1.28 |
} |
2011 |
|
|
|
2012 |
dl |
1.113 |
public CompletableFuture<Void> runAfterEitherAsync(CompletionStage<?> other, |
2013 |
|
|
Runnable action) { |
2014 |
|
|
return orRunStage(asyncPool, other, action); |
2015 |
dl |
1.28 |
} |
2016 |
|
|
|
2017 |
dl |
1.113 |
public CompletableFuture<Void> runAfterEitherAsync(CompletionStage<?> other, |
2018 |
|
|
Runnable action, |
2019 |
|
|
Executor executor) { |
2020 |
|
|
return orRunStage(screenExecutor(executor), other, action); |
2021 |
dl |
1.1 |
} |
2022 |
|
|
|
2023 |
dl |
1.113 |
public <U> CompletableFuture<U> thenCompose( |
2024 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn) { |
2025 |
|
|
return uniComposeStage(null, fn); |
2026 |
dl |
1.37 |
} |
2027 |
|
|
|
2028 |
dl |
1.104 |
public <U> CompletableFuture<U> thenComposeAsync( |
2029 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn) { |
2030 |
dl |
1.113 |
return uniComposeStage(asyncPool, fn); |
2031 |
dl |
1.37 |
} |
2032 |
|
|
|
2033 |
dl |
1.104 |
public <U> CompletableFuture<U> thenComposeAsync( |
2034 |
|
|
Function<? super T, ? extends CompletionStage<U>> fn, |
2035 |
|
|
Executor executor) { |
2036 |
dl |
1.113 |
return uniComposeStage(screenExecutor(executor), fn); |
2037 |
dl |
1.37 |
} |
2038 |
|
|
|
2039 |
dl |
1.104 |
public CompletableFuture<T> whenComplete( |
2040 |
|
|
BiConsumer<? super T, ? super Throwable> action) { |
2041 |
dl |
1.113 |
return uniWhenCompleteStage(null, action); |
2042 |
dl |
1.88 |
} |
2043 |
|
|
|
2044 |
dl |
1.104 |
public CompletableFuture<T> whenCompleteAsync( |
2045 |
|
|
BiConsumer<? super T, ? super Throwable> action) { |
2046 |
dl |
1.113 |
return uniWhenCompleteStage(asyncPool, action); |
2047 |
dl |
1.88 |
} |
2048 |
|
|
|
2049 |
dl |
1.104 |
public CompletableFuture<T> whenCompleteAsync( |
2050 |
|
|
BiConsumer<? super T, ? super Throwable> action, Executor executor) { |
2051 |
dl |
1.113 |
return uniWhenCompleteStage(screenExecutor(executor), action); |
2052 |
dl |
1.88 |
} |
2053 |
|
|
|
2054 |
dl |
1.104 |
public <U> CompletableFuture<U> handle( |
2055 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn) { |
2056 |
dl |
1.113 |
return uniHandleStage(null, fn); |
2057 |
dl |
1.88 |
} |
2058 |
|
|
|
2059 |
dl |
1.104 |
public <U> CompletableFuture<U> handleAsync( |
2060 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn) { |
2061 |
dl |
1.113 |
return uniHandleStage(asyncPool, fn); |
2062 |
dl |
1.88 |
} |
2063 |
|
|
|
2064 |
dl |
1.104 |
public <U> CompletableFuture<U> handleAsync( |
2065 |
|
|
BiFunction<? super T, Throwable, ? extends U> fn, Executor executor) { |
2066 |
dl |
1.113 |
return uniHandleStage(screenExecutor(executor), fn); |
2067 |
dl |
1.88 |
} |
2068 |
|
|
|
2069 |
|
|
/** |
2070 |
jsr166 |
1.108 |
* Returns this CompletableFuture. |
2071 |
dl |
1.88 |
* |
2072 |
|
|
* @return this CompletableFuture |
2073 |
|
|
*/ |
2074 |
|
|
public CompletableFuture<T> toCompletableFuture() { |
2075 |
|
|
return this; |
2076 |
dl |
1.28 |
} |
2077 |
|
|
|
2078 |
dl |
1.88 |
// not in interface CompletionStage |
2079 |
|
|
|
2080 |
dl |
1.28 |
/** |
2081 |
jsr166 |
1.66 |
* Returns a new CompletableFuture that is completed when this |
2082 |
|
|
* CompletableFuture completes, with the result of the given |
2083 |
|
|
* function of the exception triggering this CompletableFuture's |
2084 |
|
|
* completion when it completes exceptionally; otherwise, if this |
2085 |
|
|
* CompletableFuture completes normally, then the returned |
2086 |
|
|
* CompletableFuture also completes normally with the same value. |
2087 |
dl |
1.88 |
* Note: More flexible versions of this functionality are |
2088 |
|
|
* available using methods {@code whenComplete} and {@code handle}. |
2089 |
dl |
1.28 |
* |
2090 |
|
|
* @param fn the function to use to compute the value of the |
2091 |
|
|
* returned CompletableFuture if this CompletableFuture completed |
2092 |
|
|
* exceptionally |
2093 |
|
|
* @return the new CompletableFuture |
2094 |
|
|
*/ |
2095 |
dl |
1.104 |
public CompletableFuture<T> exceptionally( |
2096 |
|
|
Function<Throwable, ? extends T> fn) { |
2097 |
dl |
1.113 |
return uniExceptionallyStage(fn); |
2098 |
dl |
1.28 |
} |
2099 |
|
|
|
2100 |
dl |
1.35 |
/* ------------- Arbitrary-arity constructions -------------- */ |
2101 |
|
|
|
2102 |
|
|
/** |
2103 |
|
|
* Returns a new CompletableFuture that is completed when all of |
2104 |
jsr166 |
1.66 |
* the given CompletableFutures complete. If any of the given |
2105 |
jsr166 |
1.69 |
* CompletableFutures complete exceptionally, then the returned |
2106 |
|
|
* CompletableFuture also does so, with a CompletionException |
2107 |
|
|
* holding this exception as its cause. Otherwise, the results, |
2108 |
|
|
* if any, of the given CompletableFutures are not reflected in |
2109 |
|
|
* the returned CompletableFuture, but may be obtained by |
2110 |
|
|
* inspecting them individually. If no CompletableFutures are |
2111 |
|
|
* provided, returns a CompletableFuture completed with the value |
2112 |
|
|
* {@code null}. |
2113 |
dl |
1.35 |
* |
2114 |
|
|
* <p>Among the applications of this method is to await completion |
2115 |
|
|
* of a set of independent CompletableFutures before continuing a |
2116 |
|
|
* program, as in: {@code CompletableFuture.allOf(c1, c2, |
2117 |
|
|
* c3).join();}. |
2118 |
|
|
* |
2119 |
|
|
* @param cfs the CompletableFutures |
2120 |
jsr166 |
1.59 |
* @return a new CompletableFuture that is completed when all of the |
2121 |
dl |
1.35 |
* given CompletableFutures complete |
2122 |
|
|
* @throws NullPointerException if the array or any of its elements are |
2123 |
|
|
* {@code null} |
2124 |
|
|
*/ |
2125 |
|
|
public static CompletableFuture<Void> allOf(CompletableFuture<?>... cfs) { |
2126 |
dl |
1.113 |
return andTree(cfs, 0, cfs.length - 1); |
2127 |
dl |
1.35 |
} |
2128 |
|
|
|
2129 |
|
|
/** |
2130 |
dl |
1.76 |
* Returns a new CompletableFuture that is completed when any of |
2131 |
jsr166 |
1.79 |
* the given CompletableFutures complete, with the same result. |
2132 |
|
|
* Otherwise, if it completed exceptionally, the returned |
2133 |
dl |
1.77 |
* CompletableFuture also does so, with a CompletionException |
2134 |
|
|
* holding this exception as its cause. If no CompletableFutures |
2135 |
|
|
* are provided, returns an incomplete CompletableFuture. |
2136 |
dl |
1.35 |
* |
2137 |
|
|
* @param cfs the CompletableFutures |
2138 |
dl |
1.77 |
* @return a new CompletableFuture that is completed with the |
2139 |
|
|
* result or exception of any of the given CompletableFutures when |
2140 |
|
|
* one completes |
2141 |
dl |
1.35 |
* @throws NullPointerException if the array or any of its elements are |
2142 |
|
|
* {@code null} |
2143 |
|
|
*/ |
2144 |
dl |
1.77 |
public static CompletableFuture<Object> anyOf(CompletableFuture<?>... cfs) { |
2145 |
dl |
1.113 |
return orTree(cfs, 0, cfs.length - 1); |
2146 |
dl |
1.35 |
} |
2147 |
|
|
|
2148 |
|
|
/* ------------- Control and status methods -------------- */ |
2149 |
|
|
|
2150 |
dl |
1.28 |
/** |
2151 |
dl |
1.37 |
* If not already completed, completes this CompletableFuture with |
2152 |
|
|
* a {@link CancellationException}. Dependent CompletableFutures |
2153 |
|
|
* that have not already completed will also complete |
2154 |
|
|
* exceptionally, with a {@link CompletionException} caused by |
2155 |
|
|
* this {@code CancellationException}. |
2156 |
dl |
1.28 |
* |
2157 |
|
|
* @param mayInterruptIfRunning this value has no effect in this |
2158 |
|
|
* implementation because interrupts are not used to control |
2159 |
|
|
* processing. |
2160 |
|
|
* |
2161 |
|
|
* @return {@code true} if this task is now cancelled |
2162 |
|
|
*/ |
2163 |
|
|
public boolean cancel(boolean mayInterruptIfRunning) { |
2164 |
dl |
1.46 |
boolean cancelled = (result == null) && |
2165 |
dl |
1.104 |
internalComplete(new AltResult(new CancellationException())); |
2166 |
|
|
postComplete(); |
2167 |
dl |
1.48 |
return cancelled || isCancelled(); |
2168 |
dl |
1.28 |
} |
2169 |
|
|
|
2170 |
|
|
/** |
2171 |
|
|
* Returns {@code true} if this CompletableFuture was cancelled |
2172 |
|
|
* before it completed normally. |
2173 |
|
|
* |
2174 |
|
|
* @return {@code true} if this CompletableFuture was cancelled |
2175 |
|
|
* before it completed normally |
2176 |
|
|
*/ |
2177 |
|
|
public boolean isCancelled() { |
2178 |
|
|
Object r; |
2179 |
jsr166 |
1.43 |
return ((r = result) instanceof AltResult) && |
2180 |
|
|
(((AltResult)r).ex instanceof CancellationException); |
2181 |
dl |
1.28 |
} |
2182 |
|
|
|
2183 |
|
|
/** |
2184 |
dl |
1.88 |
* Returns {@code true} if this CompletableFuture completed |
2185 |
dl |
1.91 |
* exceptionally, in any way. Possible causes include |
2186 |
|
|
* cancellation, explicit invocation of {@code |
2187 |
|
|
* completeExceptionally}, and abrupt termination of a |
2188 |
|
|
* CompletionStage action. |
2189 |
dl |
1.88 |
* |
2190 |
|
|
* @return {@code true} if this CompletableFuture completed |
2191 |
|
|
* exceptionally |
2192 |
|
|
*/ |
2193 |
|
|
public boolean isCompletedExceptionally() { |
2194 |
dl |
1.91 |
Object r; |
2195 |
|
|
return ((r = result) instanceof AltResult) && r != NIL; |
2196 |
dl |
1.88 |
} |
2197 |
|
|
|
2198 |
|
|
/** |
2199 |
dl |
1.28 |
* Forcibly sets or resets the value subsequently returned by |
2200 |
jsr166 |
1.42 |
* method {@link #get()} and related methods, whether or not |
2201 |
|
|
* already completed. This method is designed for use only in |
2202 |
|
|
* error recovery actions, and even in such situations may result |
2203 |
|
|
* in ongoing dependent completions using established versus |
2204 |
dl |
1.30 |
* overwritten outcomes. |
2205 |
dl |
1.28 |
* |
2206 |
|
|
* @param value the completion value |
2207 |
|
|
*/ |
2208 |
|
|
public void obtrudeValue(T value) { |
2209 |
|
|
result = (value == null) ? NIL : value; |
2210 |
dl |
1.104 |
postComplete(); |
2211 |
dl |
1.28 |
} |
2212 |
|
|
|
2213 |
dl |
1.30 |
/** |
2214 |
jsr166 |
1.41 |
* Forcibly causes subsequent invocations of method {@link #get()} |
2215 |
|
|
* and related methods to throw the given exception, whether or |
2216 |
|
|
* not already completed. This method is designed for use only in |
2217 |
jsr166 |
1.119 |
* error recovery actions, and even in such situations may result |
2218 |
|
|
* in ongoing dependent completions using established versus |
2219 |
dl |
1.30 |
* overwritten outcomes. |
2220 |
|
|
* |
2221 |
|
|
* @param ex the exception |
2222 |
jsr166 |
1.120 |
* @throws NullPointerException if the exception is null |
2223 |
dl |
1.30 |
*/ |
2224 |
|
|
public void obtrudeException(Throwable ex) { |
2225 |
|
|
if (ex == null) throw new NullPointerException(); |
2226 |
|
|
result = new AltResult(ex); |
2227 |
dl |
1.104 |
postComplete(); |
2228 |
dl |
1.30 |
} |
2229 |
|
|
|
2230 |
dl |
1.35 |
/** |
2231 |
|
|
* Returns the estimated number of CompletableFutures whose |
2232 |
|
|
* completions are awaiting completion of this CompletableFuture. |
2233 |
|
|
* This method is designed for use in monitoring system state, not |
2234 |
|
|
* for synchronization control. |
2235 |
|
|
* |
2236 |
|
|
* @return the number of dependent CompletableFutures |
2237 |
|
|
*/ |
2238 |
|
|
public int getNumberOfDependents() { |
2239 |
|
|
int count = 0; |
2240 |
dl |
1.113 |
for (Completion p = stack; p != null; p = p.next) |
2241 |
dl |
1.35 |
++count; |
2242 |
|
|
return count; |
2243 |
|
|
} |
2244 |
|
|
|
2245 |
|
|
/** |
2246 |
|
|
* Returns a string identifying this CompletableFuture, as well as |
2247 |
jsr166 |
1.40 |
* its completion state. The state, in brackets, contains the |
2248 |
dl |
1.35 |
* String {@code "Completed Normally"} or the String {@code |
2249 |
|
|
* "Completed Exceptionally"}, or the String {@code "Not |
2250 |
|
|
* completed"} followed by the number of CompletableFutures |
2251 |
|
|
* dependent upon its completion, if any. |
2252 |
|
|
* |
2253 |
|
|
* @return a string identifying this CompletableFuture, as well as its state |
2254 |
|
|
*/ |
2255 |
|
|
public String toString() { |
2256 |
|
|
Object r = result; |
2257 |
jsr166 |
1.40 |
int count; |
2258 |
|
|
return super.toString() + |
2259 |
|
|
((r == null) ? |
2260 |
|
|
(((count = getNumberOfDependents()) == 0) ? |
2261 |
|
|
"[Not completed]" : |
2262 |
|
|
"[Not completed, " + count + " dependents]") : |
2263 |
|
|
(((r instanceof AltResult) && ((AltResult)r).ex != null) ? |
2264 |
|
|
"[Completed exceptionally]" : |
2265 |
|
|
"[Completed normally]")); |
2266 |
dl |
1.35 |
} |
2267 |
|
|
|
2268 |
dl |
1.1 |
// Unsafe mechanics |
2269 |
|
|
private static final sun.misc.Unsafe UNSAFE; |
2270 |
|
|
private static final long RESULT; |
2271 |
dl |
1.113 |
private static final long STACK; |
2272 |
dl |
1.1 |
static { |
2273 |
|
|
try { |
2274 |
|
|
UNSAFE = sun.misc.Unsafe.getUnsafe(); |
2275 |
|
|
Class<?> k = CompletableFuture.class; |
2276 |
|
|
RESULT = UNSAFE.objectFieldOffset |
2277 |
|
|
(k.getDeclaredField("result")); |
2278 |
dl |
1.113 |
STACK = UNSAFE.objectFieldOffset |
2279 |
|
|
(k.getDeclaredField("stack")); |
2280 |
dl |
1.104 |
} catch (Exception x) { |
2281 |
|
|
throw new Error(x); |
2282 |
dl |
1.1 |
} |
2283 |
|
|
} |
2284 |
|
|
} |