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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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|
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package java.util.concurrent; |
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|
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import java.util.concurrent.locks.LockSupport; |
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import java.util.function.BiConsumer; |
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import java.util.function.BiFunction; |
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import java.util.function.Consumer; |
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import java.util.function.Function; |
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import java.util.function.Supplier; |
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|
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/** |
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* A {@link Future} that may be explicitly completed (setting its |
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* value and status), and may be used as a {@link CompletionStage}, |
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* supporting dependent functions and actions that trigger upon its |
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* completion. |
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* |
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* <p>When two or more threads attempt to |
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* {@link #complete complete}, |
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* {@link #completeExceptionally completeExceptionally}, or |
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* {@link #cancel cancel} |
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* a CompletableFuture, only one of them succeeds. |
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* |
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* <p>In addition to these and related methods for directly |
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* manipulating status and results, CompletableFuture implements |
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* interface {@link CompletionStage} with the following policies: <ul> |
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* |
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* <li>Actions supplied for dependent completions of |
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* <em>non-async</em> methods may be performed by the thread that |
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* completes the current CompletableFuture, or by any other caller of |
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* a completion method. |
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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). This may be |
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* overridden for non-static methods in subclasses by defining method |
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* {@link #defaultExecutor()}. To simplify monitoring, debugging, |
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* and tracking, all generated asynchronous tasks are instances of the |
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* marker interface {@link AsynchronousCompletionTask}. Operations |
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* with time-delays can use adapter methods defined in this class, for |
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* example: {@code supplyAsync(supplier, delayedExecutor(timeout, |
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* timeUnit))}. To support methods with delays and timeouts, this |
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* class maintains at most one daemon thread for triggering and |
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* cancelling actions, not for running them. |
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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. |
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* |
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* <li>All CompletionStage methods return CompletableFutures. To |
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* restrict usages to only those methods defined in interface |
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* CompletionStage, use method {@link #minimalCompletionStage}. Or to |
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* ensure only that clients do not themselves modify a future, use |
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* method {@link #copy}. |
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* </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. |
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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. |
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* </ul> |
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* |
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* <p>Arguments used to pass a completion result (that is, for |
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* parameters of type {@code T}) for methods accepting them may be |
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* null, but passing a null value for any other parameter will result |
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* in a {@link NullPointerException} being thrown. |
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* |
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* <p>Subclasses of this class should normally override the "virtual |
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* constructor" method {@link #newIncompleteFuture}, which establishes |
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* the concrete type returned by CompletionStage methods. For example, |
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* here is a class that substitutes a different default Executor and |
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* disables the {@code obtrude} methods: |
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* |
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* <pre> {@code |
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* class MyCompletableFuture<T> extends CompletableFuture<T> { |
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* static final Executor myExecutor = ...; |
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* public MyCompletableFuture() { } |
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* public <U> CompletableFuture<U> newIncompleteFuture() { |
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* return new MyCompletableFuture<U>(); } |
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* public Executor defaultExecutor() { |
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* return myExecutor; } |
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* public void obtrudeValue(T value) { |
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* throw new UnsupportedOperationException(); } |
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* public void obtrudeException(Throwable ex) { |
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* throw new UnsupportedOperationException(); } |
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* }}</pre> |
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* |
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* @author Doug Lea |
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* @since 1.8 |
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* @param <T> The result type returned by this future's {@code join} |
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* and {@code get} methods |
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*/ |
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public class CompletableFuture<T> implements Future<T>, CompletionStage<T> { |
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|
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/* |
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* Overview: |
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* |
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* A CompletableFuture may have dependent completion actions, |
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* collected in a linked stack. It atomically completes by CASing |
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* a result field, and then pops off and runs those actions. This |
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* applies across normal vs exceptional outcomes, sync vs async |
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* actions, binary triggers, and various forms of completions. |
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* |
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* Non-nullness of field result (set via CAS) indicates done. An |
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* AltResult is used to box null as a result, as well as to hold |
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* exceptions. Using a single field makes completion simple to |
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* detect and trigger. Encoding and decoding is straightforward |
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* but adds to the sprawl of trapping and associating exceptions |
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* with targets. Minor simplifications rely on (static) NIL (to |
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* box null results) being the only AltResult with a null |
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* exception field, so we don't usually need explicit comparisons. |
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* Even though some of the generics casts are unchecked (see |
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* SuppressWarnings annotations), they are placed to be |
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* appropriate even if checked. |
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* |
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* Dependent actions are represented by Completion objects linked |
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* as Treiber stacks headed by field "stack". There are Completion |
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* classes for each kind of action, grouped into single-input |
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* (UniCompletion), two-input (BiCompletion), projected |
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* (BiCompletions using either (not both) of two inputs), shared |
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* (CoCompletion, used by the second of two sources), zero-input |
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* source actions, and Signallers that unblock waiters. Class |
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* Completion extends ForkJoinTask to enable async execution |
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* (adding no space overhead because we exploit its "tag" methods |
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* to maintain claims). It is also declared as Runnable to allow |
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* usage with arbitrary executors. |
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* |
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* Support for each kind of CompletionStage relies on a separate |
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* class, along with two CompletableFuture methods: |
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* |
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* * A Completion class with name X corresponding to function, |
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* prefaced with "Uni", "Bi", or "Or". Each class contains |
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* fields for source(s), actions, and dependent. They are |
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* boringly similar, differing from others only with respect to |
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* underlying functional forms. We do this so that users don't |
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* encounter layers of adapters in common usages. |
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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 tryFire to be called twice (SYNC, |
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* then 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 tryFire, in NESTED mode. Triggering can propagate |
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* recursively, so NESTED mode returns its completed dependent (if |
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* one exists) for further processing by its caller (see method |
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* 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. The screening checks needed anyway harmlessly ignore |
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* null arguments that may have been obtained during races with |
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* threads nulling out fields. We also try to unlink fired |
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* Completions from stacks that might never be popped (see method |
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* postFire). Completion fields need not be declared as final or |
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* volatile because they are only visible to other threads upon |
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* safe publication. |
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*/ |
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|
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volatile Object result; // Either the result or boxed AltResult |
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volatile Completion stack; // Top of Treiber stack of dependent actions |
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|
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final boolean internalComplete(Object r) { // CAS from null to r |
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return U.compareAndSwapObject(this, RESULT, null, r); |
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} |
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|
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final boolean casStack(Completion cmp, Completion val) { |
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return U.compareAndSwapObject(this, STACK, cmp, val); |
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} |
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|
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/** Returns true if successfully pushed c onto stack. */ |
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final boolean tryPushStack(Completion c) { |
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Completion h = stack; |
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lazySetNext(c, h); |
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return U.compareAndSwapObject(this, STACK, h, c); |
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} |
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|
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/** Unconditionally pushes c onto stack, retrying if necessary. */ |
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final void pushStack(Completion c) { |
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do {} while (!tryPushStack(c)); |
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} |
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|
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/* ------------- Encoding and decoding outcomes -------------- */ |
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|
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static final class AltResult { // See above |
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final Throwable ex; // null only for NIL |
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AltResult(Throwable x) { this.ex = x; } |
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} |
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|
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/** The encoding of the null value. */ |
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static final AltResult NIL = new AltResult(null); |
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|
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/** Completes with the null value, unless already completed. */ |
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final boolean completeNull() { |
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return U.compareAndSwapObject(this, RESULT, null, |
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NIL); |
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} |
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|
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/** Returns the encoding of the given non-exceptional value. */ |
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final Object encodeValue(T t) { |
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return (t == null) ? NIL : t; |
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} |
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|
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/** Completes with a non-exceptional result, unless already completed. */ |
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final boolean completeValue(T t) { |
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return U.compareAndSwapObject(this, RESULT, null, |
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(t == null) ? NIL : t); |
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} |
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|
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/** |
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* Returns the encoding of the given (non-null) exception as a |
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* wrapped CompletionException unless it is one already. |
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*/ |
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static AltResult encodeThrowable(Throwable x) { |
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return new AltResult((x instanceof CompletionException) ? x : |
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new CompletionException(x)); |
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} |
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|
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/** Completes with an exceptional result, unless already completed. */ |
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final boolean completeThrowable(Throwable x) { |
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return U.compareAndSwapObject(this, RESULT, null, |
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encodeThrowable(x)); |
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} |
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|
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/** |
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* Returns the encoding of the given (non-null) exception as a |
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* wrapped CompletionException unless it is one already. May |
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* return the given Object r (which must have been the result of a |
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* source future) if it is equivalent, i.e. if this is a simple |
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* relay of an existing CompletionException. |
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*/ |
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static Object encodeThrowable(Throwable x, Object r) { |
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if (!(x instanceof CompletionException)) |
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x = new CompletionException(x); |
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else if (r instanceof AltResult && x == ((AltResult)r).ex) |
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return r; |
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return new AltResult(x); |
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} |
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|
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/** |
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* Completes with the given (non-null) exceptional result as a |
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* wrapped CompletionException unless it is one already, unless |
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* already completed. May complete with the given Object r |
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* (which must have been the result of a source future) if it is |
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* equivalent, i.e. if this is a simple propagation of an |
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* existing CompletionException. |
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*/ |
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final boolean completeThrowable(Throwable x, Object r) { |
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return U.compareAndSwapObject(this, RESULT, null, |
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encodeThrowable(x, r)); |
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} |
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|
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/** |
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* Returns the encoding of the given arguments: if the exception |
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* is non-null, encodes as AltResult. Otherwise uses the given |
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* value, boxed as NIL if null. |
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*/ |
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Object encodeOutcome(T t, Throwable x) { |
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return (x == null) ? (t == null) ? NIL : t : encodeThrowable(x); |
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} |
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|
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/** |
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* Returns the encoding of a copied outcome; if exceptional, |
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* rewraps as a CompletionException, else returns argument. |
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*/ |
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static Object encodeRelay(Object r) { |
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Throwable x; |
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return (((r instanceof AltResult) && |
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(x = ((AltResult)r).ex) != null && |
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!(x instanceof CompletionException)) ? |
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new AltResult(new CompletionException(x)) : r); |
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} |
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|
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/** |
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* Completes with r or a copy of r, unless already completed. |
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* If exceptional, r is first coerced to a CompletionException. |
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*/ |
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final boolean completeRelay(Object r) { |
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return U.compareAndSwapObject(this, RESULT, null, |
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encodeRelay(r)); |
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} |
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|
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/** |
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* Reports result using Future.get conventions. |
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*/ |
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private static <T> T reportGet(Object r) |
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throws InterruptedException, ExecutionException { |
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if (r == null) // by convention below, null means interrupted |
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throw new InterruptedException(); |
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if (r instanceof AltResult) { |
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Throwable x, cause; |
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if ((x = ((AltResult)r).ex) == null) |
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return null; |
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if (x instanceof CancellationException) |
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throw (CancellationException)x; |
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if ((x instanceof CompletionException) && |
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(cause = x.getCause()) != null) |
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x = cause; |
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throw new ExecutionException(x); |
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} |
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@SuppressWarnings("unchecked") T t = (T) r; |
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return t; |
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} |
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|
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/** |
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* Decodes outcome to return result or throw unchecked exception. |
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*/ |
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private static <T> T reportJoin(Object r) { |
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if (r instanceof AltResult) { |
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Throwable x; |
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if ((x = ((AltResult)r).ex) == null) |
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return null; |
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if (x instanceof CancellationException) |
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throw (CancellationException)x; |
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if (x instanceof CompletionException) |
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throw (CompletionException)x; |
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throw new CompletionException(x); |
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} |
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@SuppressWarnings("unchecked") T t = (T) r; |
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return t; |
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} |
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|
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/* ------------- Async task preliminaries -------------- */ |
381 |
|
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/** |
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* A marker interface identifying asynchronous tasks produced by |
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* {@code async} methods. This may be useful for monitoring, |
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* debugging, and tracking asynchronous activities. |
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* |
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* @since 1.8 |
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*/ |
389 |
public static interface AsynchronousCompletionTask { |
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} |
391 |
|
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private static final boolean USE_COMMON_POOL = |
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(ForkJoinPool.getCommonPoolParallelism() > 1); |
394 |
|
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/** |
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* Default executor -- ForkJoinPool.commonPool() unless it cannot |
397 |
* support parallelism. |
398 |
*/ |
399 |
private static final Executor ASYNC_POOL = USE_COMMON_POOL ? |
400 |
ForkJoinPool.commonPool() : new ThreadPerTaskExecutor(); |
401 |
|
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/** Fallback if ForkJoinPool.commonPool() cannot support parallelism */ |
403 |
static final class ThreadPerTaskExecutor implements Executor { |
404 |
public void execute(Runnable r) { new Thread(r).start(); } |
405 |
} |
406 |
|
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/** |
408 |
* Null-checks user executor argument, and translates uses of |
409 |
* commonPool to ASYNC_POOL in case parallelism disabled. |
410 |
*/ |
411 |
static Executor screenExecutor(Executor e) { |
412 |
if (!USE_COMMON_POOL && e == ForkJoinPool.commonPool()) |
413 |
return ASYNC_POOL; |
414 |
if (e == null) throw new NullPointerException(); |
415 |
return e; |
416 |
} |
417 |
|
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// Modes for Completion.tryFire. Signedness matters. |
419 |
static final int SYNC = 0; |
420 |
static final int ASYNC = 1; |
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static final int NESTED = -1; |
422 |
|
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/* ------------- Base Completion classes and operations -------------- */ |
424 |
|
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@SuppressWarnings("serial") |
426 |
abstract static class Completion extends ForkJoinTask<Void> |
427 |
implements Runnable, AsynchronousCompletionTask { |
428 |
volatile Completion next; // Treiber stack link |
429 |
|
430 |
/** |
431 |
* Performs completion action if triggered, returning a |
432 |
* dependent that may need propagation, if one exists. |
433 |
* |
434 |
* @param mode SYNC, ASYNC, or NESTED |
435 |
*/ |
436 |
abstract CompletableFuture<?> tryFire(int mode); |
437 |
|
438 |
/** Returns true if possibly still triggerable. Used by cleanStack. */ |
439 |
abstract boolean isLive(); |
440 |
|
441 |
public final void run() { tryFire(ASYNC); } |
442 |
public final boolean exec() { tryFire(ASYNC); return false; } |
443 |
public final Void getRawResult() { return null; } |
444 |
public final void setRawResult(Void v) {} |
445 |
} |
446 |
|
447 |
static void lazySetNext(Completion c, Completion next) { |
448 |
U.putOrderedObject(c, NEXT, next); |
449 |
} |
450 |
|
451 |
/** |
452 |
* Pops and tries to trigger all reachable dependents. Call only |
453 |
* when known to be done. |
454 |
*/ |
455 |
final void postComplete() { |
456 |
/* |
457 |
* On each step, variable f holds current dependents to pop |
458 |
* and run. It is extended along only one path at a time, |
459 |
* pushing others to avoid unbounded recursion. |
460 |
*/ |
461 |
CompletableFuture<?> f = this; Completion h; |
462 |
while ((h = f.stack) != null || |
463 |
(f != this && (h = (f = this).stack) != null)) { |
464 |
CompletableFuture<?> d; Completion t; |
465 |
if (f.casStack(h, t = h.next)) { |
466 |
if (t != null) { |
467 |
if (f != this) { |
468 |
pushStack(h); |
469 |
continue; |
470 |
} |
471 |
h.next = null; // detach |
472 |
} |
473 |
f = (d = h.tryFire(NESTED)) == null ? this : d; |
474 |
} |
475 |
} |
476 |
} |
477 |
|
478 |
/** Traverses stack and unlinks dead Completions. */ |
479 |
final void cleanStack() { |
480 |
for (Completion p = null, q = stack; q != null;) { |
481 |
Completion s = q.next; |
482 |
if (q.isLive()) { |
483 |
p = q; |
484 |
q = s; |
485 |
} |
486 |
else if (p == null) { |
487 |
casStack(q, s); |
488 |
q = stack; |
489 |
} |
490 |
else { |
491 |
p.next = s; |
492 |
if (p.isLive()) |
493 |
q = s; |
494 |
else { |
495 |
p = null; // restart |
496 |
q = stack; |
497 |
} |
498 |
} |
499 |
} |
500 |
} |
501 |
|
502 |
/* ------------- One-input Completions -------------- */ |
503 |
|
504 |
/** A Completion with a source, dependent, and executor. */ |
505 |
@SuppressWarnings("serial") |
506 |
abstract static class UniCompletion<T,V> extends Completion { |
507 |
Executor executor; // executor to use (null if none) |
508 |
CompletableFuture<V> dep; // the dependent to complete |
509 |
CompletableFuture<T> src; // source for action |
510 |
|
511 |
UniCompletion(Executor executor, CompletableFuture<V> dep, |
512 |
CompletableFuture<T> src) { |
513 |
this.executor = executor; this.dep = dep; this.src = src; |
514 |
} |
515 |
|
516 |
/** |
517 |
* Returns true if action can be run. Call only when known to |
518 |
* be triggerable. Uses FJ tag bit to ensure that only one |
519 |
* thread claims ownership. If async, starts as task -- a |
520 |
* later call to tryFire will run action. |
521 |
*/ |
522 |
final boolean claim() { |
523 |
Executor e = executor; |
524 |
if (compareAndSetForkJoinTaskTag((short)0, (short)1)) { |
525 |
if (e == null) |
526 |
return true; |
527 |
executor = null; // disable |
528 |
e.execute(this); |
529 |
} |
530 |
return false; |
531 |
} |
532 |
|
533 |
final boolean isLive() { return dep != null; } |
534 |
} |
535 |
|
536 |
/** Pushes the given completion (if it exists) unless done. */ |
537 |
final void push(UniCompletion<?,?> c) { |
538 |
if (c != null) { |
539 |
while (result == null && !tryPushStack(c)) |
540 |
lazySetNext(c, null); // clear on failure |
541 |
} |
542 |
} |
543 |
|
544 |
/** |
545 |
* Post-processing by dependent after successful UniCompletion |
546 |
* tryFire. Tries to clean stack of source a, and then either runs |
547 |
* postComplete or returns this to caller, depending on mode. |
548 |
*/ |
549 |
final CompletableFuture<T> postFire(CompletableFuture<?> a, int mode) { |
550 |
if (a != null && a.stack != null) { |
551 |
if (a.result == null) |
552 |
a.cleanStack(); |
553 |
else if (mode >= 0) |
554 |
a.postComplete(); |
555 |
} |
556 |
if (result != null && stack != null) { |
557 |
if (mode < 0) |
558 |
return this; |
559 |
else |
560 |
postComplete(); |
561 |
} |
562 |
return null; |
563 |
} |
564 |
|
565 |
@SuppressWarnings("serial") |
566 |
static final class UniApply<T,V> extends UniCompletion<T,V> { |
567 |
Function<? super T,? extends V> fn; |
568 |
UniApply(Executor executor, CompletableFuture<V> dep, |
569 |
CompletableFuture<T> src, |
570 |
Function<? super T,? extends V> fn) { |
571 |
super(executor, dep, src); this.fn = fn; |
572 |
} |
573 |
final CompletableFuture<V> tryFire(int mode) { |
574 |
CompletableFuture<V> d; CompletableFuture<T> a; |
575 |
if ((d = dep) == null || |
576 |
!d.uniApply(a = src, fn, mode > 0 ? null : this)) |
577 |
return null; |
578 |
dep = null; src = null; fn = null; |
579 |
return d.postFire(a, mode); |
580 |
} |
581 |
} |
582 |
|
583 |
final <S> boolean uniApply(CompletableFuture<S> a, |
584 |
Function<? super S,? extends T> f, |
585 |
UniApply<S,T> c) { |
586 |
Object r; Throwable x; |
587 |
if (a == null || (r = a.result) == null || f == null) |
588 |
return false; |
589 |
tryComplete: if (result == null) { |
590 |
if (r instanceof AltResult) { |
591 |
if ((x = ((AltResult)r).ex) != null) { |
592 |
completeThrowable(x, r); |
593 |
break tryComplete; |
594 |
} |
595 |
r = null; |
596 |
} |
597 |
try { |
598 |
if (c != null && !c.claim()) |
599 |
return false; |
600 |
@SuppressWarnings("unchecked") S s = (S) r; |
601 |
completeValue(f.apply(s)); |
602 |
} catch (Throwable ex) { |
603 |
completeThrowable(ex); |
604 |
} |
605 |
} |
606 |
return true; |
607 |
} |
608 |
|
609 |
private <V> CompletableFuture<V> uniApplyStage( |
610 |
Executor e, Function<? super T,? extends V> f) { |
611 |
if (f == null) throw new NullPointerException(); |
612 |
CompletableFuture<V> d = newIncompleteFuture(); |
613 |
if (e != null || !d.uniApply(this, f, null)) { |
614 |
UniApply<T,V> c = new UniApply<T,V>(e, d, this, f); |
615 |
if (e != null && result != null) { |
616 |
try { |
617 |
e.execute(c); |
618 |
} catch (Throwable ex) { |
619 |
d.completeThrowable(ex); |
620 |
} |
621 |
} |
622 |
else { |
623 |
push(c); |
624 |
c.tryFire(SYNC); |
625 |
} |
626 |
} |
627 |
return d; |
628 |
} |
629 |
|
630 |
@SuppressWarnings("serial") |
631 |
static final class UniAccept<T> extends UniCompletion<T,Void> { |
632 |
Consumer<? super T> fn; |
633 |
UniAccept(Executor executor, CompletableFuture<Void> dep, |
634 |
CompletableFuture<T> src, Consumer<? super T> fn) { |
635 |
super(executor, dep, src); this.fn = fn; |
636 |
} |
637 |
final CompletableFuture<Void> tryFire(int mode) { |
638 |
CompletableFuture<Void> d; CompletableFuture<T> a; |
639 |
if ((d = dep) == null || |
640 |
!d.uniAccept(a = src, fn, mode > 0 ? null : this)) |
641 |
return null; |
642 |
dep = null; src = null; fn = null; |
643 |
return d.postFire(a, mode); |
644 |
} |
645 |
} |
646 |
|
647 |
final <S> boolean uniAccept(CompletableFuture<S> a, |
648 |
Consumer<? super S> f, UniAccept<S> c) { |
649 |
Object r; Throwable x; |
650 |
if (a == null || (r = a.result) == null || f == null) |
651 |
return false; |
652 |
tryComplete: if (result == null) { |
653 |
if (r instanceof AltResult) { |
654 |
if ((x = ((AltResult)r).ex) != null) { |
655 |
completeThrowable(x, r); |
656 |
break tryComplete; |
657 |
} |
658 |
r = null; |
659 |
} |
660 |
try { |
661 |
if (c != null && !c.claim()) |
662 |
return false; |
663 |
@SuppressWarnings("unchecked") S s = (S) r; |
664 |
f.accept(s); |
665 |
completeNull(); |
666 |
} catch (Throwable ex) { |
667 |
completeThrowable(ex); |
668 |
} |
669 |
} |
670 |
return true; |
671 |
} |
672 |
|
673 |
private CompletableFuture<Void> uniAcceptStage(Executor e, |
674 |
Consumer<? super T> f) { |
675 |
if (f == null) throw new NullPointerException(); |
676 |
CompletableFuture<Void> d = newIncompleteFuture(); |
677 |
if (e != null || !d.uniAccept(this, f, null)) { |
678 |
UniAccept<T> c = new UniAccept<T>(e, d, this, f); |
679 |
if (e != null && result != null) { |
680 |
try { |
681 |
e.execute(c); |
682 |
} catch (Throwable ex) { |
683 |
d.completeThrowable(ex); |
684 |
} |
685 |
} |
686 |
else { |
687 |
push(c); |
688 |
c.tryFire(SYNC); |
689 |
} |
690 |
} |
691 |
return d; |
692 |
} |
693 |
|
694 |
@SuppressWarnings("serial") |
695 |
static final class UniRun<T> extends UniCompletion<T,Void> { |
696 |
Runnable fn; |
697 |
UniRun(Executor executor, CompletableFuture<Void> dep, |
698 |
CompletableFuture<T> src, Runnable fn) { |
699 |
super(executor, dep, src); this.fn = fn; |
700 |
} |
701 |
final CompletableFuture<Void> tryFire(int mode) { |
702 |
CompletableFuture<Void> d; CompletableFuture<T> a; |
703 |
if ((d = dep) == null || |
704 |
!d.uniRun(a = src, fn, mode > 0 ? null : this)) |
705 |
return null; |
706 |
dep = null; src = null; fn = null; |
707 |
return d.postFire(a, mode); |
708 |
} |
709 |
} |
710 |
|
711 |
final boolean uniRun(CompletableFuture<?> a, Runnable f, UniRun<?> c) { |
712 |
Object r; Throwable x; |
713 |
if (a == null || (r = a.result) == null || f == null) |
714 |
return false; |
715 |
if (result == null) { |
716 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) |
717 |
completeThrowable(x, r); |
718 |
else |
719 |
try { |
720 |
if (c != null && !c.claim()) |
721 |
return false; |
722 |
f.run(); |
723 |
completeNull(); |
724 |
} catch (Throwable ex) { |
725 |
completeThrowable(ex); |
726 |
} |
727 |
} |
728 |
return true; |
729 |
} |
730 |
|
731 |
private CompletableFuture<Void> uniRunStage(Executor e, Runnable f) { |
732 |
if (f == null) throw new NullPointerException(); |
733 |
CompletableFuture<Void> d = newIncompleteFuture(); |
734 |
if (e != null || !d.uniRun(this, f, null)) { |
735 |
UniRun<T> c = new UniRun<T>(e, d, this, f); |
736 |
if (e != null && result != null) { |
737 |
try { |
738 |
e.execute(c); |
739 |
} catch (Throwable ex) { |
740 |
d.completeThrowable(ex); |
741 |
} |
742 |
} |
743 |
else { |
744 |
push(c); |
745 |
c.tryFire(SYNC); |
746 |
} |
747 |
} |
748 |
return d; |
749 |
} |
750 |
|
751 |
@SuppressWarnings("serial") |
752 |
static final class UniWhenComplete<T> extends UniCompletion<T,T> { |
753 |
BiConsumer<? super T, ? super Throwable> fn; |
754 |
UniWhenComplete(Executor executor, CompletableFuture<T> dep, |
755 |
CompletableFuture<T> src, |
756 |
BiConsumer<? super T, ? super Throwable> fn) { |
757 |
super(executor, dep, src); this.fn = fn; |
758 |
} |
759 |
final CompletableFuture<T> tryFire(int mode) { |
760 |
CompletableFuture<T> d; CompletableFuture<T> a; |
761 |
if ((d = dep) == null || |
762 |
!d.uniWhenComplete(a = src, fn, mode > 0 ? null : this)) |
763 |
return null; |
764 |
dep = null; src = null; fn = null; |
765 |
return d.postFire(a, mode); |
766 |
} |
767 |
} |
768 |
|
769 |
final boolean uniWhenComplete(CompletableFuture<T> a, |
770 |
BiConsumer<? super T,? super Throwable> f, |
771 |
UniWhenComplete<T> c) { |
772 |
Object r; T t; Throwable x = null; |
773 |
if (a == null || (r = a.result) == null || f == null) |
774 |
return false; |
775 |
if (result == null) { |
776 |
try { |
777 |
if (c != null && !c.claim()) |
778 |
return false; |
779 |
if (r instanceof AltResult) { |
780 |
x = ((AltResult)r).ex; |
781 |
t = null; |
782 |
} else { |
783 |
@SuppressWarnings("unchecked") T tr = (T) r; |
784 |
t = tr; |
785 |
} |
786 |
f.accept(t, x); |
787 |
if (x == null) { |
788 |
internalComplete(r); |
789 |
return true; |
790 |
} |
791 |
} catch (Throwable ex) { |
792 |
if (x == null) |
793 |
x = ex; |
794 |
else if (x != ex) |
795 |
x.addSuppressed(ex); |
796 |
} |
797 |
completeThrowable(x, r); |
798 |
} |
799 |
return true; |
800 |
} |
801 |
|
802 |
private CompletableFuture<T> uniWhenCompleteStage( |
803 |
Executor e, BiConsumer<? super T, ? super Throwable> f) { |
804 |
if (f == null) throw new NullPointerException(); |
805 |
CompletableFuture<T> d = newIncompleteFuture(); |
806 |
if (e != null || !d.uniWhenComplete(this, f, null)) { |
807 |
UniWhenComplete<T> c = new UniWhenComplete<T>(e, d, this, f); |
808 |
if (e != null && result != null) { |
809 |
try { |
810 |
e.execute(c); |
811 |
} catch (Throwable ex) { |
812 |
d.completeThrowable(ex); |
813 |
} |
814 |
} |
815 |
else { |
816 |
push(c); |
817 |
c.tryFire(SYNC); |
818 |
} |
819 |
} |
820 |
return d; |
821 |
} |
822 |
|
823 |
@SuppressWarnings("serial") |
824 |
static final class UniHandle<T,V> extends UniCompletion<T,V> { |
825 |
BiFunction<? super T, Throwable, ? extends V> fn; |
826 |
UniHandle(Executor executor, CompletableFuture<V> dep, |
827 |
CompletableFuture<T> src, |
828 |
BiFunction<? super T, Throwable, ? extends V> fn) { |
829 |
super(executor, dep, src); this.fn = fn; |
830 |
} |
831 |
final CompletableFuture<V> tryFire(int mode) { |
832 |
CompletableFuture<V> d; CompletableFuture<T> a; |
833 |
if ((d = dep) == null || |
834 |
!d.uniHandle(a = src, fn, mode > 0 ? null : this)) |
835 |
return null; |
836 |
dep = null; src = null; fn = null; |
837 |
return d.postFire(a, mode); |
838 |
} |
839 |
} |
840 |
|
841 |
final <S> boolean uniHandle(CompletableFuture<S> a, |
842 |
BiFunction<? super S, Throwable, ? extends T> f, |
843 |
UniHandle<S,T> c) { |
844 |
Object r; S s; Throwable x; |
845 |
if (a == null || (r = a.result) == null || f == null) |
846 |
return false; |
847 |
if (result == null) { |
848 |
try { |
849 |
if (c != null && !c.claim()) |
850 |
return false; |
851 |
if (r instanceof AltResult) { |
852 |
x = ((AltResult)r).ex; |
853 |
s = null; |
854 |
} else { |
855 |
x = null; |
856 |
@SuppressWarnings("unchecked") S ss = (S) r; |
857 |
s = ss; |
858 |
} |
859 |
completeValue(f.apply(s, x)); |
860 |
} catch (Throwable ex) { |
861 |
completeThrowable(ex); |
862 |
} |
863 |
} |
864 |
return true; |
865 |
} |
866 |
|
867 |
private <V> CompletableFuture<V> uniHandleStage( |
868 |
Executor e, BiFunction<? super T, Throwable, ? extends V> f) { |
869 |
if (f == null) throw new NullPointerException(); |
870 |
CompletableFuture<V> d = newIncompleteFuture(); |
871 |
if (e != null || !d.uniHandle(this, f, null)) { |
872 |
UniHandle<T,V> c = new UniHandle<T,V>(e, d, this, f); |
873 |
if (e != null && result != null) { |
874 |
try { |
875 |
e.execute(c); |
876 |
} catch (Throwable ex) { |
877 |
d.completeThrowable(ex); |
878 |
} |
879 |
} |
880 |
else { |
881 |
push(c); |
882 |
c.tryFire(SYNC); |
883 |
} |
884 |
} |
885 |
return d; |
886 |
} |
887 |
|
888 |
@SuppressWarnings("serial") |
889 |
static final class UniExceptionally<T> extends UniCompletion<T,T> { |
890 |
Function<? super Throwable, ? extends T> fn; |
891 |
UniExceptionally(CompletableFuture<T> dep, CompletableFuture<T> src, |
892 |
Function<? super Throwable, ? extends T> fn) { |
893 |
super(null, dep, src); this.fn = fn; |
894 |
} |
895 |
final CompletableFuture<T> tryFire(int mode) { // never ASYNC |
896 |
// assert mode != ASYNC; |
897 |
CompletableFuture<T> d; CompletableFuture<T> a; |
898 |
if ((d = dep) == null || !d.uniExceptionally(a = src, fn, this)) |
899 |
return null; |
900 |
dep = null; src = null; fn = null; |
901 |
return d.postFire(a, mode); |
902 |
} |
903 |
} |
904 |
|
905 |
final boolean uniExceptionally(CompletableFuture<T> a, |
906 |
Function<? super Throwable, ? extends T> f, |
907 |
UniExceptionally<T> c) { |
908 |
Object r; Throwable x; |
909 |
if (a == null || (r = a.result) == null || f == null) |
910 |
return false; |
911 |
if (result == null) { |
912 |
try { |
913 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) { |
914 |
if (c != null && !c.claim()) |
915 |
return false; |
916 |
completeValue(f.apply(x)); |
917 |
} else |
918 |
internalComplete(r); |
919 |
} catch (Throwable ex) { |
920 |
completeThrowable(ex); |
921 |
} |
922 |
} |
923 |
return true; |
924 |
} |
925 |
|
926 |
private CompletableFuture<T> uniExceptionallyStage( |
927 |
Function<Throwable, ? extends T> f) { |
928 |
if (f == null) throw new NullPointerException(); |
929 |
CompletableFuture<T> d = newIncompleteFuture(); |
930 |
if (!d.uniExceptionally(this, f, null)) { |
931 |
UniExceptionally<T> c = new UniExceptionally<T>(d, this, f); |
932 |
push(c); |
933 |
c.tryFire(SYNC); |
934 |
} |
935 |
return d; |
936 |
} |
937 |
|
938 |
@SuppressWarnings("serial") |
939 |
static final class UniRelay<T> extends UniCompletion<T,T> { // for Compose |
940 |
UniRelay(CompletableFuture<T> dep, CompletableFuture<T> src) { |
941 |
super(null, dep, src); |
942 |
} |
943 |
final CompletableFuture<T> tryFire(int mode) { |
944 |
CompletableFuture<T> d; CompletableFuture<T> a; |
945 |
if ((d = dep) == null || !d.uniRelay(a = src)) |
946 |
return null; |
947 |
src = null; dep = null; |
948 |
return d.postFire(a, mode); |
949 |
} |
950 |
} |
951 |
|
952 |
final boolean uniRelay(CompletableFuture<T> a) { |
953 |
Object r; |
954 |
if (a == null || (r = a.result) == null) |
955 |
return false; |
956 |
if (result == null) // no need to claim |
957 |
completeRelay(r); |
958 |
return true; |
959 |
} |
960 |
|
961 |
private CompletableFuture<T> uniCopyStage() { |
962 |
Object r; |
963 |
CompletableFuture<T> d = newIncompleteFuture(); |
964 |
if ((r = result) != null) |
965 |
d.completeRelay(r); |
966 |
else { |
967 |
UniRelay<T> c = new UniRelay<T>(d, this); |
968 |
push(c); |
969 |
c.tryFire(SYNC); |
970 |
} |
971 |
return d; |
972 |
} |
973 |
|
974 |
private MinimalStage<T> uniAsMinimalStage() { |
975 |
Object r; |
976 |
if ((r = result) != null) |
977 |
return new MinimalStage<T>(encodeRelay(r)); |
978 |
MinimalStage<T> d = new MinimalStage<T>(); |
979 |
UniRelay<T> c = new UniRelay<T>(d, this); |
980 |
push(c); |
981 |
c.tryFire(SYNC); |
982 |
return d; |
983 |
} |
984 |
|
985 |
@SuppressWarnings("serial") |
986 |
static final class UniCompose<T,V> extends UniCompletion<T,V> { |
987 |
Function<? super T, ? extends CompletionStage<V>> fn; |
988 |
UniCompose(Executor executor, CompletableFuture<V> dep, |
989 |
CompletableFuture<T> src, |
990 |
Function<? super T, ? extends CompletionStage<V>> fn) { |
991 |
super(executor, dep, src); this.fn = fn; |
992 |
} |
993 |
final CompletableFuture<V> tryFire(int mode) { |
994 |
CompletableFuture<V> d; CompletableFuture<T> a; |
995 |
if ((d = dep) == null || |
996 |
!d.uniCompose(a = src, fn, mode > 0 ? null : this)) |
997 |
return null; |
998 |
dep = null; src = null; fn = null; |
999 |
return d.postFire(a, mode); |
1000 |
} |
1001 |
} |
1002 |
|
1003 |
final <S> boolean uniCompose( |
1004 |
CompletableFuture<S> a, |
1005 |
Function<? super S, ? extends CompletionStage<T>> f, |
1006 |
UniCompose<S,T> c) { |
1007 |
Object r; Throwable x; |
1008 |
if (a == null || (r = a.result) == null || f == null) |
1009 |
return false; |
1010 |
tryComplete: if (result == null) { |
1011 |
if (r instanceof AltResult) { |
1012 |
if ((x = ((AltResult)r).ex) != null) { |
1013 |
completeThrowable(x, r); |
1014 |
break tryComplete; |
1015 |
} |
1016 |
r = null; |
1017 |
} |
1018 |
try { |
1019 |
if (c != null && !c.claim()) |
1020 |
return false; |
1021 |
@SuppressWarnings("unchecked") S s = (S) r; |
1022 |
CompletableFuture<T> g = f.apply(s).toCompletableFuture(); |
1023 |
if (g.result == null || !uniRelay(g)) { |
1024 |
UniRelay<T> copy = new UniRelay<T>(this, g); |
1025 |
g.push(copy); |
1026 |
copy.tryFire(SYNC); |
1027 |
if (result == null) |
1028 |
return false; |
1029 |
} |
1030 |
} catch (Throwable ex) { |
1031 |
completeThrowable(ex); |
1032 |
} |
1033 |
} |
1034 |
return true; |
1035 |
} |
1036 |
|
1037 |
private <V> CompletableFuture<V> uniComposeStage( |
1038 |
Executor e, Function<? super T, ? extends CompletionStage<V>> f) { |
1039 |
if (f == null) throw new NullPointerException(); |
1040 |
Object r, s; Throwable x; |
1041 |
CompletableFuture<V> d = newIncompleteFuture(); |
1042 |
if ((r = result) != null && e == null) { |
1043 |
if (r instanceof AltResult) { |
1044 |
if ((x = ((AltResult)r).ex) != null) { |
1045 |
d.result = encodeThrowable(x, r); |
1046 |
return d; |
1047 |
} |
1048 |
r = null; |
1049 |
} |
1050 |
try { |
1051 |
@SuppressWarnings("unchecked") T t = (T) r; |
1052 |
CompletableFuture<V> g = f.apply(t).toCompletableFuture(); |
1053 |
if ((s = g.result) != null) |
1054 |
d.completeRelay(s); |
1055 |
else { |
1056 |
UniRelay<V> c = new UniRelay<V>(d, g); |
1057 |
g.push(c); |
1058 |
c.tryFire(SYNC); |
1059 |
} |
1060 |
return d; |
1061 |
} catch (Throwable ex) { |
1062 |
d.result = encodeThrowable(ex); |
1063 |
return d; |
1064 |
} |
1065 |
} |
1066 |
UniCompose<T,V> c = new UniCompose<T,V>(e, d, this, f); |
1067 |
if (r != null && e != null) { |
1068 |
try { |
1069 |
e.execute(new UniCompose<T,V>(null, d, this, f)); |
1070 |
} catch (Throwable ex) { |
1071 |
d.completeThrowable(ex); |
1072 |
} |
1073 |
} |
1074 |
else { |
1075 |
push(c); |
1076 |
c.tryFire(SYNC); |
1077 |
} |
1078 |
return d; |
1079 |
} |
1080 |
|
1081 |
/* ------------- Two-input Completions -------------- */ |
1082 |
|
1083 |
/** A Completion for an action with two sources */ |
1084 |
@SuppressWarnings("serial") |
1085 |
abstract static class BiCompletion<T,U,V> extends UniCompletion<T,V> { |
1086 |
CompletableFuture<U> snd; // second source for action |
1087 |
BiCompletion(Executor executor, CompletableFuture<V> dep, |
1088 |
CompletableFuture<T> src, CompletableFuture<U> snd) { |
1089 |
super(executor, dep, src); this.snd = snd; |
1090 |
} |
1091 |
} |
1092 |
|
1093 |
/** A Completion delegating to a BiCompletion */ |
1094 |
@SuppressWarnings("serial") |
1095 |
static final class CoCompletion extends Completion { |
1096 |
BiCompletion<?,?,?> base; |
1097 |
CoCompletion(BiCompletion<?,?,?> base) { this.base = base; } |
1098 |
final CompletableFuture<?> tryFire(int mode) { |
1099 |
BiCompletion<?,?,?> c; CompletableFuture<?> d; |
1100 |
if ((c = base) == null || (d = c.tryFire(mode)) == null) |
1101 |
return null; |
1102 |
base = null; // detach |
1103 |
return d; |
1104 |
} |
1105 |
final boolean isLive() { |
1106 |
BiCompletion<?,?,?> c; |
1107 |
return (c = base) != null && c.dep != null; |
1108 |
} |
1109 |
} |
1110 |
|
1111 |
/** Pushes completion to this and b unless both done. */ |
1112 |
final void bipush(CompletableFuture<?> b, BiCompletion<?,?,?> c) { |
1113 |
if (c != null) { |
1114 |
Object r; |
1115 |
while ((r = result) == null && !tryPushStack(c)) |
1116 |
lazySetNext(c, null); // clear on failure |
1117 |
if (b != null && b != this && b.result == null) { |
1118 |
Completion q = (r != null) ? c : new CoCompletion(c); |
1119 |
while (b.result == null && !b.tryPushStack(q)) |
1120 |
lazySetNext(q, null); // clear on failure |
1121 |
} |
1122 |
} |
1123 |
} |
1124 |
|
1125 |
/** Post-processing after successful BiCompletion tryFire. */ |
1126 |
final CompletableFuture<T> postFire(CompletableFuture<?> a, |
1127 |
CompletableFuture<?> b, int mode) { |
1128 |
if (b != null && b.stack != null) { // clean second source |
1129 |
if (b.result == null) |
1130 |
b.cleanStack(); |
1131 |
else if (mode >= 0) |
1132 |
b.postComplete(); |
1133 |
} |
1134 |
return postFire(a, mode); |
1135 |
} |
1136 |
|
1137 |
@SuppressWarnings("serial") |
1138 |
static final class BiApply<T,U,V> extends BiCompletion<T,U,V> { |
1139 |
BiFunction<? super T,? super U,? extends V> fn; |
1140 |
BiApply(Executor executor, CompletableFuture<V> dep, |
1141 |
CompletableFuture<T> src, CompletableFuture<U> snd, |
1142 |
BiFunction<? super T,? super U,? extends V> fn) { |
1143 |
super(executor, dep, src, snd); this.fn = fn; |
1144 |
} |
1145 |
final CompletableFuture<V> tryFire(int mode) { |
1146 |
CompletableFuture<V> d; |
1147 |
CompletableFuture<T> a; |
1148 |
CompletableFuture<U> b; |
1149 |
if ((d = dep) == null || |
1150 |
!d.biApply(a = src, b = snd, fn, mode > 0 ? null : this)) |
1151 |
return null; |
1152 |
dep = null; src = null; snd = null; fn = null; |
1153 |
return d.postFire(a, b, mode); |
1154 |
} |
1155 |
} |
1156 |
|
1157 |
final <R,S> boolean biApply(CompletableFuture<R> a, |
1158 |
CompletableFuture<S> b, |
1159 |
BiFunction<? super R,? super S,? extends T> f, |
1160 |
BiApply<R,S,T> c) { |
1161 |
Object r, s; Throwable x; |
1162 |
if (a == null || (r = a.result) == null || |
1163 |
b == null || (s = b.result) == null || f == null) |
1164 |
return false; |
1165 |
tryComplete: if (result == null) { |
1166 |
if (r instanceof AltResult) { |
1167 |
if ((x = ((AltResult)r).ex) != null) { |
1168 |
completeThrowable(x, r); |
1169 |
break tryComplete; |
1170 |
} |
1171 |
r = null; |
1172 |
} |
1173 |
if (s instanceof AltResult) { |
1174 |
if ((x = ((AltResult)s).ex) != null) { |
1175 |
completeThrowable(x, s); |
1176 |
break tryComplete; |
1177 |
} |
1178 |
s = null; |
1179 |
} |
1180 |
try { |
1181 |
if (c != null && !c.claim()) |
1182 |
return false; |
1183 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1184 |
@SuppressWarnings("unchecked") S ss = (S) s; |
1185 |
completeValue(f.apply(rr, ss)); |
1186 |
} catch (Throwable ex) { |
1187 |
completeThrowable(ex); |
1188 |
} |
1189 |
} |
1190 |
return true; |
1191 |
} |
1192 |
|
1193 |
private <U,V> CompletableFuture<V> biApplyStage( |
1194 |
Executor e, CompletionStage<U> o, |
1195 |
BiFunction<? super T,? super U,? extends V> f) { |
1196 |
CompletableFuture<U> b; |
1197 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1198 |
throw new NullPointerException(); |
1199 |
CompletableFuture<V> d = newIncompleteFuture(); |
1200 |
if (e != null || !d.biApply(this, b, f, null)) { |
1201 |
BiApply<T,U,V> c = new BiApply<T,U,V>(e, d, this, b, f); |
1202 |
if (e != null && result != null && b.result != null) { |
1203 |
try { |
1204 |
e.execute(c); |
1205 |
} catch (Throwable ex) { |
1206 |
d.completeThrowable(ex); |
1207 |
} |
1208 |
} |
1209 |
else { |
1210 |
bipush(b, c); |
1211 |
c.tryFire(SYNC); |
1212 |
} |
1213 |
} |
1214 |
return d; |
1215 |
} |
1216 |
|
1217 |
@SuppressWarnings("serial") |
1218 |
static final class BiAccept<T,U> extends BiCompletion<T,U,Void> { |
1219 |
BiConsumer<? super T,? super U> fn; |
1220 |
BiAccept(Executor executor, CompletableFuture<Void> dep, |
1221 |
CompletableFuture<T> src, CompletableFuture<U> snd, |
1222 |
BiConsumer<? super T,? super U> fn) { |
1223 |
super(executor, dep, src, snd); this.fn = fn; |
1224 |
} |
1225 |
final CompletableFuture<Void> tryFire(int mode) { |
1226 |
CompletableFuture<Void> d; |
1227 |
CompletableFuture<T> a; |
1228 |
CompletableFuture<U> b; |
1229 |
if ((d = dep) == null || |
1230 |
!d.biAccept(a = src, b = snd, fn, mode > 0 ? null : this)) |
1231 |
return null; |
1232 |
dep = null; src = null; snd = null; fn = null; |
1233 |
return d.postFire(a, b, mode); |
1234 |
} |
1235 |
} |
1236 |
|
1237 |
final <R,S> boolean biAccept(CompletableFuture<R> a, |
1238 |
CompletableFuture<S> b, |
1239 |
BiConsumer<? super R,? super S> f, |
1240 |
BiAccept<R,S> c) { |
1241 |
Object r, s; Throwable x; |
1242 |
if (a == null || (r = a.result) == null || |
1243 |
b == null || (s = b.result) == null || f == null) |
1244 |
return false; |
1245 |
tryComplete: if (result == null) { |
1246 |
if (r instanceof AltResult) { |
1247 |
if ((x = ((AltResult)r).ex) != null) { |
1248 |
completeThrowable(x, r); |
1249 |
break tryComplete; |
1250 |
} |
1251 |
r = null; |
1252 |
} |
1253 |
if (s instanceof AltResult) { |
1254 |
if ((x = ((AltResult)s).ex) != null) { |
1255 |
completeThrowable(x, s); |
1256 |
break tryComplete; |
1257 |
} |
1258 |
s = null; |
1259 |
} |
1260 |
try { |
1261 |
if (c != null && !c.claim()) |
1262 |
return false; |
1263 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1264 |
@SuppressWarnings("unchecked") S ss = (S) s; |
1265 |
f.accept(rr, ss); |
1266 |
completeNull(); |
1267 |
} catch (Throwable ex) { |
1268 |
completeThrowable(ex); |
1269 |
} |
1270 |
} |
1271 |
return true; |
1272 |
} |
1273 |
|
1274 |
private <U> CompletableFuture<Void> biAcceptStage( |
1275 |
Executor e, CompletionStage<U> o, |
1276 |
BiConsumer<? super T,? super U> f) { |
1277 |
CompletableFuture<U> b; |
1278 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1279 |
throw new NullPointerException(); |
1280 |
CompletableFuture<Void> d = newIncompleteFuture(); |
1281 |
if (e != null || !d.biAccept(this, b, f, null)) { |
1282 |
BiAccept<T,U> c = new BiAccept<T,U>(e, d, this, b, f); |
1283 |
if (e != null && result != null && b.result != null) { |
1284 |
try { |
1285 |
e.execute(c); |
1286 |
} catch (Throwable ex) { |
1287 |
d.completeThrowable(ex); |
1288 |
} |
1289 |
} |
1290 |
else { |
1291 |
bipush(b, c); |
1292 |
c.tryFire(SYNC); |
1293 |
} |
1294 |
} |
1295 |
return d; |
1296 |
} |
1297 |
|
1298 |
@SuppressWarnings("serial") |
1299 |
static final class BiRun<T,U> extends BiCompletion<T,U,Void> { |
1300 |
Runnable fn; |
1301 |
BiRun(Executor executor, CompletableFuture<Void> dep, |
1302 |
CompletableFuture<T> src, |
1303 |
CompletableFuture<U> snd, |
1304 |
Runnable fn) { |
1305 |
super(executor, dep, src, snd); this.fn = fn; |
1306 |
} |
1307 |
final CompletableFuture<Void> tryFire(int mode) { |
1308 |
CompletableFuture<Void> d; |
1309 |
CompletableFuture<T> a; |
1310 |
CompletableFuture<U> b; |
1311 |
if ((d = dep) == null || |
1312 |
!d.biRun(a = src, b = snd, fn, mode > 0 ? null : this)) |
1313 |
return null; |
1314 |
dep = null; src = null; snd = null; fn = null; |
1315 |
return d.postFire(a, b, mode); |
1316 |
} |
1317 |
} |
1318 |
|
1319 |
final boolean biRun(CompletableFuture<?> a, CompletableFuture<?> b, |
1320 |
Runnable f, BiRun<?,?> c) { |
1321 |
Object r, s; Throwable x; |
1322 |
if (a == null || (r = a.result) == null || |
1323 |
b == null || (s = b.result) == null || f == null) |
1324 |
return false; |
1325 |
if (result == null) { |
1326 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) |
1327 |
completeThrowable(x, r); |
1328 |
else if (s instanceof AltResult && (x = ((AltResult)s).ex) != null) |
1329 |
completeThrowable(x, s); |
1330 |
else |
1331 |
try { |
1332 |
if (c != null && !c.claim()) |
1333 |
return false; |
1334 |
f.run(); |
1335 |
completeNull(); |
1336 |
} catch (Throwable ex) { |
1337 |
completeThrowable(ex); |
1338 |
} |
1339 |
} |
1340 |
return true; |
1341 |
} |
1342 |
|
1343 |
private CompletableFuture<Void> biRunStage(Executor e, CompletionStage<?> o, |
1344 |
Runnable f) { |
1345 |
CompletableFuture<?> b; |
1346 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1347 |
throw new NullPointerException(); |
1348 |
CompletableFuture<Void> d = newIncompleteFuture(); |
1349 |
if (e != null || !d.biRun(this, b, f, null)) { |
1350 |
BiRun<T,?> c = new BiRun<>(e, d, this, b, f); |
1351 |
if (e != null && result != null && b.result != null) { |
1352 |
try { |
1353 |
e.execute(c); |
1354 |
} catch (Throwable ex) { |
1355 |
d.completeThrowable(ex); |
1356 |
} |
1357 |
} |
1358 |
else { |
1359 |
bipush(b, c); |
1360 |
c.tryFire(SYNC); |
1361 |
} |
1362 |
} |
1363 |
return d; |
1364 |
} |
1365 |
|
1366 |
@SuppressWarnings("serial") |
1367 |
static final class BiRelay<T,U> extends BiCompletion<T,U,Void> { // for And |
1368 |
BiRelay(CompletableFuture<Void> dep, |
1369 |
CompletableFuture<T> src, |
1370 |
CompletableFuture<U> snd) { |
1371 |
super(null, dep, src, snd); |
1372 |
} |
1373 |
final CompletableFuture<Void> tryFire(int mode) { |
1374 |
CompletableFuture<Void> d; |
1375 |
CompletableFuture<T> a; |
1376 |
CompletableFuture<U> b; |
1377 |
if ((d = dep) == null || !d.biRelay(a = src, b = snd)) |
1378 |
return null; |
1379 |
src = null; snd = null; dep = null; |
1380 |
return d.postFire(a, b, mode); |
1381 |
} |
1382 |
} |
1383 |
|
1384 |
boolean biRelay(CompletableFuture<?> a, CompletableFuture<?> b) { |
1385 |
Object r, s; Throwable x; |
1386 |
if (a == null || (r = a.result) == null || |
1387 |
b == null || (s = b.result) == null) |
1388 |
return false; |
1389 |
if (result == null) { |
1390 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) |
1391 |
completeThrowable(x, r); |
1392 |
else if (s instanceof AltResult && (x = ((AltResult)s).ex) != null) |
1393 |
completeThrowable(x, s); |
1394 |
else |
1395 |
completeNull(); |
1396 |
} |
1397 |
return true; |
1398 |
} |
1399 |
|
1400 |
/** Recursively constructs a tree of completions. */ |
1401 |
static CompletableFuture<Void> andTree(CompletableFuture<?>[] cfs, |
1402 |
int lo, int hi) { |
1403 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1404 |
if (lo > hi) // empty |
1405 |
d.result = NIL; |
1406 |
else { |
1407 |
CompletableFuture<?> a, b; |
1408 |
int mid = (lo + hi) >>> 1; |
1409 |
if ((a = (lo == mid ? cfs[lo] : |
1410 |
andTree(cfs, lo, mid))) == null || |
1411 |
(b = (lo == hi ? a : (hi == mid+1) ? cfs[hi] : |
1412 |
andTree(cfs, mid+1, hi))) == null) |
1413 |
throw new NullPointerException(); |
1414 |
if (!d.biRelay(a, b)) { |
1415 |
BiRelay<?,?> c = new BiRelay<>(d, a, b); |
1416 |
a.bipush(b, c); |
1417 |
c.tryFire(SYNC); |
1418 |
} |
1419 |
} |
1420 |
return d; |
1421 |
} |
1422 |
|
1423 |
/* ------------- Projected (Ored) BiCompletions -------------- */ |
1424 |
|
1425 |
/** Pushes completion to this and b unless either done. */ |
1426 |
final void orpush(CompletableFuture<?> b, BiCompletion<?,?,?> c) { |
1427 |
if (c != null) { |
1428 |
while ((b == null || b.result == null) && result == null) { |
1429 |
if (tryPushStack(c)) { |
1430 |
if (b != null && b != this && b.result == null) { |
1431 |
Completion q = new CoCompletion(c); |
1432 |
while (result == null && b.result == null && |
1433 |
!b.tryPushStack(q)) |
1434 |
lazySetNext(q, null); // clear on failure |
1435 |
} |
1436 |
break; |
1437 |
} |
1438 |
lazySetNext(c, null); // clear on failure |
1439 |
} |
1440 |
} |
1441 |
} |
1442 |
|
1443 |
@SuppressWarnings("serial") |
1444 |
static final class OrApply<T,U extends T,V> extends BiCompletion<T,U,V> { |
1445 |
Function<? super T,? extends V> fn; |
1446 |
OrApply(Executor executor, CompletableFuture<V> dep, |
1447 |
CompletableFuture<T> src, |
1448 |
CompletableFuture<U> snd, |
1449 |
Function<? super T,? extends V> fn) { |
1450 |
super(executor, dep, src, snd); this.fn = fn; |
1451 |
} |
1452 |
final CompletableFuture<V> tryFire(int mode) { |
1453 |
CompletableFuture<V> d; |
1454 |
CompletableFuture<T> a; |
1455 |
CompletableFuture<U> b; |
1456 |
if ((d = dep) == null || |
1457 |
!d.orApply(a = src, b = snd, fn, mode > 0 ? null : this)) |
1458 |
return null; |
1459 |
dep = null; src = null; snd = null; fn = null; |
1460 |
return d.postFire(a, b, mode); |
1461 |
} |
1462 |
} |
1463 |
|
1464 |
final <R,S extends R> boolean orApply(CompletableFuture<R> a, |
1465 |
CompletableFuture<S> b, |
1466 |
Function<? super R, ? extends T> f, |
1467 |
OrApply<R,S,T> c) { |
1468 |
Object r; Throwable x; |
1469 |
if (a == null || b == null || |
1470 |
((r = a.result) == null && (r = b.result) == null) || f == null) |
1471 |
return false; |
1472 |
tryComplete: if (result == null) { |
1473 |
try { |
1474 |
if (c != null && !c.claim()) |
1475 |
return false; |
1476 |
if (r instanceof AltResult) { |
1477 |
if ((x = ((AltResult)r).ex) != null) { |
1478 |
completeThrowable(x, r); |
1479 |
break tryComplete; |
1480 |
} |
1481 |
r = null; |
1482 |
} |
1483 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1484 |
completeValue(f.apply(rr)); |
1485 |
} catch (Throwable ex) { |
1486 |
completeThrowable(ex); |
1487 |
} |
1488 |
} |
1489 |
return true; |
1490 |
} |
1491 |
|
1492 |
private <U extends T,V> CompletableFuture<V> orApplyStage( |
1493 |
Executor e, CompletionStage<U> o, |
1494 |
Function<? super T, ? extends V> f) { |
1495 |
CompletableFuture<U> b; |
1496 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1497 |
throw new NullPointerException(); |
1498 |
CompletableFuture<V> d = newIncompleteFuture(); |
1499 |
if (e != null || !d.orApply(this, b, f, null)) { |
1500 |
OrApply<T,U,V> c = new OrApply<T,U,V>(e, d, this, b, f); |
1501 |
if (e != null && (result != null || b.result != null)) { |
1502 |
try { |
1503 |
e.execute(c); |
1504 |
} catch (Throwable ex) { |
1505 |
d.completeThrowable(ex); |
1506 |
} |
1507 |
} |
1508 |
else { |
1509 |
orpush(b, c); |
1510 |
c.tryFire(SYNC); |
1511 |
} |
1512 |
} |
1513 |
return d; |
1514 |
} |
1515 |
|
1516 |
@SuppressWarnings("serial") |
1517 |
static final class OrAccept<T,U extends T> extends BiCompletion<T,U,Void> { |
1518 |
Consumer<? super T> fn; |
1519 |
OrAccept(Executor executor, CompletableFuture<Void> dep, |
1520 |
CompletableFuture<T> src, |
1521 |
CompletableFuture<U> snd, |
1522 |
Consumer<? super T> fn) { |
1523 |
super(executor, dep, src, snd); this.fn = fn; |
1524 |
} |
1525 |
final CompletableFuture<Void> tryFire(int mode) { |
1526 |
CompletableFuture<Void> d; |
1527 |
CompletableFuture<T> a; |
1528 |
CompletableFuture<U> b; |
1529 |
if ((d = dep) == null || |
1530 |
!d.orAccept(a = src, b = snd, fn, mode > 0 ? null : this)) |
1531 |
return null; |
1532 |
dep = null; src = null; snd = null; fn = null; |
1533 |
return d.postFire(a, b, mode); |
1534 |
} |
1535 |
} |
1536 |
|
1537 |
final <R,S extends R> boolean orAccept(CompletableFuture<R> a, |
1538 |
CompletableFuture<S> b, |
1539 |
Consumer<? super R> f, |
1540 |
OrAccept<R,S> c) { |
1541 |
Object r; Throwable x; |
1542 |
if (a == null || b == null || |
1543 |
((r = a.result) == null && (r = b.result) == null) || f == null) |
1544 |
return false; |
1545 |
tryComplete: if (result == null) { |
1546 |
try { |
1547 |
if (c != null && !c.claim()) |
1548 |
return false; |
1549 |
if (r instanceof AltResult) { |
1550 |
if ((x = ((AltResult)r).ex) != null) { |
1551 |
completeThrowable(x, r); |
1552 |
break tryComplete; |
1553 |
} |
1554 |
r = null; |
1555 |
} |
1556 |
@SuppressWarnings("unchecked") R rr = (R) r; |
1557 |
f.accept(rr); |
1558 |
completeNull(); |
1559 |
} catch (Throwable ex) { |
1560 |
completeThrowable(ex); |
1561 |
} |
1562 |
} |
1563 |
return true; |
1564 |
} |
1565 |
|
1566 |
private <U extends T> CompletableFuture<Void> orAcceptStage( |
1567 |
Executor e, CompletionStage<U> o, Consumer<? super T> f) { |
1568 |
CompletableFuture<U> b; |
1569 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1570 |
throw new NullPointerException(); |
1571 |
CompletableFuture<Void> d = newIncompleteFuture(); |
1572 |
if (e != null || !d.orAccept(this, b, f, null)) { |
1573 |
OrAccept<T,U> c = new OrAccept<T,U>(e, d, this, b, f); |
1574 |
if (e != null && (result != null || b.result != null)) { |
1575 |
try { |
1576 |
e.execute(c); |
1577 |
} catch (Throwable ex) { |
1578 |
d.completeThrowable(ex); |
1579 |
} |
1580 |
} |
1581 |
else { |
1582 |
orpush(b, c); |
1583 |
c.tryFire(SYNC); |
1584 |
} |
1585 |
} |
1586 |
return d; |
1587 |
} |
1588 |
|
1589 |
@SuppressWarnings("serial") |
1590 |
static final class OrRun<T,U> extends BiCompletion<T,U,Void> { |
1591 |
Runnable fn; |
1592 |
OrRun(Executor executor, CompletableFuture<Void> dep, |
1593 |
CompletableFuture<T> src, |
1594 |
CompletableFuture<U> snd, |
1595 |
Runnable fn) { |
1596 |
super(executor, dep, src, snd); this.fn = fn; |
1597 |
} |
1598 |
final CompletableFuture<Void> tryFire(int mode) { |
1599 |
CompletableFuture<Void> d; |
1600 |
CompletableFuture<T> a; |
1601 |
CompletableFuture<U> b; |
1602 |
if ((d = dep) == null || |
1603 |
!d.orRun(a = src, b = snd, fn, mode > 0 ? null : this)) |
1604 |
return null; |
1605 |
dep = null; src = null; snd = null; fn = null; |
1606 |
return d.postFire(a, b, mode); |
1607 |
} |
1608 |
} |
1609 |
|
1610 |
final boolean orRun(CompletableFuture<?> a, CompletableFuture<?> b, |
1611 |
Runnable f, OrRun<?,?> c) { |
1612 |
Object r; Throwable x; |
1613 |
if (a == null || b == null || |
1614 |
((r = a.result) == null && (r = b.result) == null) || f == null) |
1615 |
return false; |
1616 |
if (result == null) { |
1617 |
try { |
1618 |
if (c != null && !c.claim()) |
1619 |
return false; |
1620 |
if (r instanceof AltResult && (x = ((AltResult)r).ex) != null) |
1621 |
completeThrowable(x, r); |
1622 |
else { |
1623 |
f.run(); |
1624 |
completeNull(); |
1625 |
} |
1626 |
} catch (Throwable ex) { |
1627 |
completeThrowable(ex); |
1628 |
} |
1629 |
} |
1630 |
return true; |
1631 |
} |
1632 |
|
1633 |
private CompletableFuture<Void> orRunStage(Executor e, CompletionStage<?> o, |
1634 |
Runnable f) { |
1635 |
CompletableFuture<?> b; |
1636 |
if (f == null || (b = o.toCompletableFuture()) == null) |
1637 |
throw new NullPointerException(); |
1638 |
CompletableFuture<Void> d = newIncompleteFuture(); |
1639 |
if (e != null || !d.orRun(this, b, f, null)) { |
1640 |
OrRun<T,?> c = new OrRun<>(e, d, this, b, f); |
1641 |
if (e != null && (result != null || b.result != null)) { |
1642 |
try { |
1643 |
e.execute(c); |
1644 |
} catch (Throwable ex) { |
1645 |
d.completeThrowable(ex); |
1646 |
} |
1647 |
} |
1648 |
else { |
1649 |
orpush(b, c); |
1650 |
c.tryFire(SYNC); |
1651 |
} |
1652 |
} |
1653 |
return d; |
1654 |
} |
1655 |
|
1656 |
@SuppressWarnings("serial") |
1657 |
static final class OrRelay<T,U> extends BiCompletion<T,U,Object> { // for Or |
1658 |
OrRelay(CompletableFuture<Object> dep, CompletableFuture<T> src, |
1659 |
CompletableFuture<U> snd) { |
1660 |
super(null, dep, src, snd); |
1661 |
} |
1662 |
final CompletableFuture<Object> tryFire(int mode) { |
1663 |
CompletableFuture<Object> d; |
1664 |
CompletableFuture<T> a; |
1665 |
CompletableFuture<U> b; |
1666 |
if ((d = dep) == null || !d.orRelay(a = src, b = snd)) |
1667 |
return null; |
1668 |
src = null; snd = null; dep = null; |
1669 |
return d.postFire(a, b, mode); |
1670 |
} |
1671 |
} |
1672 |
|
1673 |
final boolean orRelay(CompletableFuture<?> a, CompletableFuture<?> b) { |
1674 |
Object r; |
1675 |
if (a == null || b == null || |
1676 |
((r = a.result) == null && (r = b.result) == null)) |
1677 |
return false; |
1678 |
if (result == null) |
1679 |
completeRelay(r); |
1680 |
return true; |
1681 |
} |
1682 |
|
1683 |
/** Recursively constructs a tree of completions. */ |
1684 |
static CompletableFuture<Object> orTree(CompletableFuture<?>[] cfs, |
1685 |
int lo, int hi) { |
1686 |
CompletableFuture<Object> d = new CompletableFuture<Object>(); |
1687 |
if (lo <= hi) { |
1688 |
CompletableFuture<?> a, b; |
1689 |
int mid = (lo + hi) >>> 1; |
1690 |
if ((a = (lo == mid ? cfs[lo] : |
1691 |
orTree(cfs, lo, mid))) == null || |
1692 |
(b = (lo == hi ? a : (hi == mid+1) ? cfs[hi] : |
1693 |
orTree(cfs, mid+1, hi))) == null) |
1694 |
throw new NullPointerException(); |
1695 |
if (!d.orRelay(a, b)) { |
1696 |
OrRelay<?,?> c = new OrRelay<>(d, a, b); |
1697 |
a.orpush(b, c); |
1698 |
c.tryFire(SYNC); |
1699 |
} |
1700 |
} |
1701 |
return d; |
1702 |
} |
1703 |
|
1704 |
/* ------------- Zero-input Async forms -------------- */ |
1705 |
|
1706 |
@SuppressWarnings("serial") |
1707 |
static final class AsyncSupply<T> extends ForkJoinTask<Void> |
1708 |
implements Runnable, AsynchronousCompletionTask { |
1709 |
CompletableFuture<T> dep; Supplier<? extends T> fn; |
1710 |
AsyncSupply(CompletableFuture<T> dep, Supplier<? extends T> fn) { |
1711 |
this.dep = dep; this.fn = fn; |
1712 |
} |
1713 |
|
1714 |
public final Void getRawResult() { return null; } |
1715 |
public final void setRawResult(Void v) {} |
1716 |
public final boolean exec() { run(); return true; } |
1717 |
|
1718 |
public void run() { |
1719 |
CompletableFuture<T> d; Supplier<? extends T> f; |
1720 |
if ((d = dep) != null && (f = fn) != null) { |
1721 |
dep = null; fn = null; |
1722 |
if (d.result == null) { |
1723 |
try { |
1724 |
d.completeValue(f.get()); |
1725 |
} catch (Throwable ex) { |
1726 |
d.completeThrowable(ex); |
1727 |
} |
1728 |
} |
1729 |
d.postComplete(); |
1730 |
} |
1731 |
} |
1732 |
} |
1733 |
|
1734 |
static <U> CompletableFuture<U> asyncSupplyStage(Executor e, |
1735 |
Supplier<U> f) { |
1736 |
if (f == null) throw new NullPointerException(); |
1737 |
CompletableFuture<U> d = new CompletableFuture<U>(); |
1738 |
e.execute(new AsyncSupply<U>(d, f)); |
1739 |
return d; |
1740 |
} |
1741 |
|
1742 |
@SuppressWarnings("serial") |
1743 |
static final class AsyncRun extends ForkJoinTask<Void> |
1744 |
implements Runnable, AsynchronousCompletionTask { |
1745 |
CompletableFuture<Void> dep; Runnable fn; |
1746 |
AsyncRun(CompletableFuture<Void> dep, Runnable fn) { |
1747 |
this.dep = dep; this.fn = fn; |
1748 |
} |
1749 |
|
1750 |
public final Void getRawResult() { return null; } |
1751 |
public final void setRawResult(Void v) {} |
1752 |
public final boolean exec() { run(); return true; } |
1753 |
|
1754 |
public void run() { |
1755 |
CompletableFuture<Void> d; Runnable f; |
1756 |
if ((d = dep) != null && (f = fn) != null) { |
1757 |
dep = null; fn = null; |
1758 |
if (d.result == null) { |
1759 |
try { |
1760 |
f.run(); |
1761 |
d.completeNull(); |
1762 |
} catch (Throwable ex) { |
1763 |
d.completeThrowable(ex); |
1764 |
} |
1765 |
} |
1766 |
d.postComplete(); |
1767 |
} |
1768 |
} |
1769 |
} |
1770 |
|
1771 |
static CompletableFuture<Void> asyncRunStage(Executor e, Runnable f) { |
1772 |
if (f == null) throw new NullPointerException(); |
1773 |
CompletableFuture<Void> d = new CompletableFuture<Void>(); |
1774 |
e.execute(new AsyncRun(d, f)); |
1775 |
return d; |
1776 |
} |
1777 |
|
1778 |
/* ------------- Signallers -------------- */ |
1779 |
|
1780 |
/** |
1781 |
* Completion for recording and releasing a waiting thread. This |
1782 |
* class implements ManagedBlocker to avoid starvation when |
1783 |
* blocking actions pile up in ForkJoinPools. |
1784 |
*/ |
1785 |
@SuppressWarnings("serial") |
1786 |
static final class Signaller extends Completion |
1787 |
implements ForkJoinPool.ManagedBlocker { |
1788 |
long nanos; // remaining wait time if timed |
1789 |
final long deadline; // non-zero if timed |
1790 |
final boolean interruptible; |
1791 |
boolean interrupted; |
1792 |
volatile Thread thread; |
1793 |
|
1794 |
Signaller(boolean interruptible, long nanos, long deadline) { |
1795 |
this.thread = Thread.currentThread(); |
1796 |
this.interruptible = interruptible; |
1797 |
this.nanos = nanos; |
1798 |
this.deadline = deadline; |
1799 |
} |
1800 |
final CompletableFuture<?> tryFire(int ignore) { |
1801 |
Thread w; // no need to atomically claim |
1802 |
if ((w = thread) != null) { |
1803 |
thread = null; |
1804 |
LockSupport.unpark(w); |
1805 |
} |
1806 |
return null; |
1807 |
} |
1808 |
public boolean isReleasable() { |
1809 |
if (Thread.interrupted()) |
1810 |
interrupted = true; |
1811 |
return ((interrupted && interruptible) || |
1812 |
(deadline != 0L && |
1813 |
(nanos <= 0L || |
1814 |
(nanos = deadline - System.nanoTime()) <= 0L)) || |
1815 |
thread == null); |
1816 |
} |
1817 |
public boolean block() { |
1818 |
while (!isReleasable()) { |
1819 |
if (deadline == 0L) |
1820 |
LockSupport.park(this); |
1821 |
else |
1822 |
LockSupport.parkNanos(this, nanos); |
1823 |
} |
1824 |
return true; |
1825 |
} |
1826 |
final boolean isLive() { return thread != null; } |
1827 |
} |
1828 |
|
1829 |
/** |
1830 |
* Returns raw result after waiting, or null if interruptible and |
1831 |
* interrupted. |
1832 |
*/ |
1833 |
private Object waitingGet(boolean interruptible) { |
1834 |
Signaller q = null; |
1835 |
boolean queued = false; |
1836 |
Object r; |
1837 |
while ((r = result) == null) { |
1838 |
if (q == null) { |
1839 |
q = new Signaller(interruptible, 0L, 0L); |
1840 |
ForkJoinPool.helpAsyncBlocker(defaultExecutor(), q); |
1841 |
} |
1842 |
else if (!queued) |
1843 |
queued = tryPushStack(q); |
1844 |
else { |
1845 |
try { |
1846 |
ForkJoinPool.managedBlock(q); |
1847 |
} catch (InterruptedException ie) { // currently cannot happen |
1848 |
q.interrupted = true; |
1849 |
} |
1850 |
if (q.interrupted && interruptible) |
1851 |
break; |
1852 |
} |
1853 |
} |
1854 |
if (q != null) { |
1855 |
q.thread = null; |
1856 |
if (q.interrupted) { |
1857 |
if (interruptible) |
1858 |
cleanStack(); |
1859 |
else |
1860 |
Thread.currentThread().interrupt(); |
1861 |
} |
1862 |
} |
1863 |
if (r != null) |
1864 |
postComplete(); |
1865 |
return r; |
1866 |
} |
1867 |
|
1868 |
/** |
1869 |
* Returns raw result after waiting, or null if interrupted, or |
1870 |
* throws TimeoutException on timeout. |
1871 |
*/ |
1872 |
private Object timedGet(long nanos) throws TimeoutException { |
1873 |
if (Thread.interrupted()) |
1874 |
return null; |
1875 |
if (nanos > 0L) { |
1876 |
long d = System.nanoTime() + nanos; |
1877 |
long deadline = (d == 0L) ? 1L : d; // avoid 0 |
1878 |
Signaller q = null; |
1879 |
boolean queued = false; |
1880 |
Object r; |
1881 |
while ((r = result) == null) { // similar to untimed |
1882 |
if (q == null) { |
1883 |
q = new Signaller(true, nanos, deadline); |
1884 |
ForkJoinPool.helpAsyncBlocker(defaultExecutor(), q); |
1885 |
} |
1886 |
else if (!queued) |
1887 |
queued = tryPushStack(q); |
1888 |
else if (q.nanos <= 0L) |
1889 |
break; |
1890 |
else { |
1891 |
try { |
1892 |
ForkJoinPool.managedBlock(q); |
1893 |
} catch (InterruptedException ie) { |
1894 |
q.interrupted = true; |
1895 |
} |
1896 |
if (q.interrupted) |
1897 |
break; |
1898 |
} |
1899 |
} |
1900 |
if (q != null) |
1901 |
q.thread = null; |
1902 |
if (r != null) |
1903 |
postComplete(); |
1904 |
else |
1905 |
cleanStack(); |
1906 |
if (r != null || (q != null && q.interrupted)) |
1907 |
return r; |
1908 |
} |
1909 |
throw new TimeoutException(); |
1910 |
} |
1911 |
|
1912 |
/* ------------- public methods -------------- */ |
1913 |
|
1914 |
/** |
1915 |
* Creates a new incomplete CompletableFuture. |
1916 |
*/ |
1917 |
public CompletableFuture() { |
1918 |
} |
1919 |
|
1920 |
/** |
1921 |
* Creates a new complete CompletableFuture with given encoded result. |
1922 |
*/ |
1923 |
CompletableFuture(Object r) { |
1924 |
this.result = r; |
1925 |
} |
1926 |
|
1927 |
/** |
1928 |
* Returns a new CompletableFuture that is asynchronously completed |
1929 |
* by a task running in the {@link ForkJoinPool#commonPool()} with |
1930 |
* the value obtained by calling the given Supplier. |
1931 |
* |
1932 |
* @param supplier a function returning the value to be used |
1933 |
* to complete the returned CompletableFuture |
1934 |
* @param <U> the function's return type |
1935 |
* @return the new CompletableFuture |
1936 |
*/ |
1937 |
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier) { |
1938 |
return asyncSupplyStage(ASYNC_POOL, supplier); |
1939 |
} |
1940 |
|
1941 |
/** |
1942 |
* Returns a new CompletableFuture that is asynchronously completed |
1943 |
* by a task running in the given executor with the value obtained |
1944 |
* by calling the given Supplier. |
1945 |
* |
1946 |
* @param supplier a function returning the value to be used |
1947 |
* to complete the returned CompletableFuture |
1948 |
* @param executor the executor to use for asynchronous execution |
1949 |
* @param <U> the function's return type |
1950 |
* @return the new CompletableFuture |
1951 |
*/ |
1952 |
public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier, |
1953 |
Executor executor) { |
1954 |
return asyncSupplyStage(screenExecutor(executor), supplier); |
1955 |
} |
1956 |
|
1957 |
/** |
1958 |
* Returns a new CompletableFuture that is asynchronously completed |
1959 |
* by a task running in the {@link ForkJoinPool#commonPool()} after |
1960 |
* it runs the given action. |
1961 |
* |
1962 |
* @param runnable the action to run before completing the |
1963 |
* returned CompletableFuture |
1964 |
* @return the new CompletableFuture |
1965 |
*/ |
1966 |
public static CompletableFuture<Void> runAsync(Runnable runnable) { |
1967 |
return asyncRunStage(ASYNC_POOL, runnable); |
1968 |
} |
1969 |
|
1970 |
/** |
1971 |
* Returns a new CompletableFuture that is asynchronously completed |
1972 |
* by a task running in the given executor after it runs the given |
1973 |
* action. |
1974 |
* |
1975 |
* @param runnable the action to run before completing the |
1976 |
* returned CompletableFuture |
1977 |
* @param executor the executor to use for asynchronous execution |
1978 |
* @return the new CompletableFuture |
1979 |
*/ |
1980 |
public static CompletableFuture<Void> runAsync(Runnable runnable, |
1981 |
Executor executor) { |
1982 |
return asyncRunStage(screenExecutor(executor), runnable); |
1983 |
} |
1984 |
|
1985 |
/** |
1986 |
* Returns a new CompletableFuture that is already completed with |
1987 |
* the given value. |
1988 |
* |
1989 |
* @param value the value |
1990 |
* @param <U> the type of the value |
1991 |
* @return the completed CompletableFuture |
1992 |
*/ |
1993 |
public static <U> CompletableFuture<U> completedFuture(U value) { |
1994 |
return new CompletableFuture<U>((value == null) ? NIL : value); |
1995 |
} |
1996 |
|
1997 |
/** |
1998 |
* Returns {@code true} if completed in any fashion: normally, |
1999 |
* exceptionally, or via cancellation. |
2000 |
* |
2001 |
* @return {@code true} if completed |
2002 |
*/ |
2003 |
public boolean isDone() { |
2004 |
return result != null; |
2005 |
} |
2006 |
|
2007 |
/** |
2008 |
* Waits if necessary for this future to complete, and then |
2009 |
* returns its result. |
2010 |
* |
2011 |
* @return the result value |
2012 |
* @throws CancellationException if this future was cancelled |
2013 |
* @throws ExecutionException if this future completed exceptionally |
2014 |
* @throws InterruptedException if the current thread was interrupted |
2015 |
* while waiting |
2016 |
*/ |
2017 |
public T get() throws InterruptedException, ExecutionException { |
2018 |
Object r; |
2019 |
return reportGet((r = result) == null ? waitingGet(true) : r); |
2020 |
} |
2021 |
|
2022 |
/** |
2023 |
* Waits if necessary for at most the given time for this future |
2024 |
* to complete, and then returns its result, if available. |
2025 |
* |
2026 |
* @param timeout the maximum time to wait |
2027 |
* @param unit the time unit of the timeout argument |
2028 |
* @return the result value |
2029 |
* @throws CancellationException if this future was cancelled |
2030 |
* @throws ExecutionException if this future completed exceptionally |
2031 |
* @throws InterruptedException if the current thread was interrupted |
2032 |
* while waiting |
2033 |
* @throws TimeoutException if the wait timed out |
2034 |
*/ |
2035 |
public T get(long timeout, TimeUnit unit) |
2036 |
throws InterruptedException, ExecutionException, TimeoutException { |
2037 |
Object r; |
2038 |
long nanos = unit.toNanos(timeout); |
2039 |
return reportGet((r = result) == null ? timedGet(nanos) : r); |
2040 |
} |
2041 |
|
2042 |
/** |
2043 |
* Returns the result value when complete, or throws an |
2044 |
* (unchecked) exception if completed exceptionally. To better |
2045 |
* conform with the use of common functional forms, if a |
2046 |
* computation involved in the completion of this |
2047 |
* CompletableFuture threw an exception, this method throws an |
2048 |
* (unchecked) {@link CompletionException} with the underlying |
2049 |
* exception as its cause. |
2050 |
* |
2051 |
* @return the result value |
2052 |
* @throws CancellationException if the computation was cancelled |
2053 |
* @throws CompletionException if this future completed |
2054 |
* exceptionally or a completion computation threw an exception |
2055 |
*/ |
2056 |
public T join() { |
2057 |
Object r; |
2058 |
return reportJoin((r = result) == null ? waitingGet(false) : r); |
2059 |
} |
2060 |
|
2061 |
/** |
2062 |
* Returns the result value (or throws any encountered exception) |
2063 |
* if completed, else returns the given valueIfAbsent. |
2064 |
* |
2065 |
* @param valueIfAbsent the value to return if not completed |
2066 |
* @return the result value, if completed, else the given valueIfAbsent |
2067 |
* @throws CancellationException if the computation was cancelled |
2068 |
* @throws CompletionException if this future completed |
2069 |
* exceptionally or a completion computation threw an exception |
2070 |
*/ |
2071 |
public T getNow(T valueIfAbsent) { |
2072 |
Object r; |
2073 |
return ((r = result) == null) ? valueIfAbsent : reportJoin(r); |
2074 |
} |
2075 |
|
2076 |
/** |
2077 |
* If not already completed, sets the value returned by {@link |
2078 |
* #get()} and related methods to the given value. |
2079 |
* |
2080 |
* @param value the result value |
2081 |
* @return {@code true} if this invocation caused this CompletableFuture |
2082 |
* to transition to a completed state, else {@code false} |
2083 |
*/ |
2084 |
public boolean complete(T value) { |
2085 |
boolean triggered = completeValue(value); |
2086 |
postComplete(); |
2087 |
return triggered; |
2088 |
} |
2089 |
|
2090 |
/** |
2091 |
* If not already completed, causes invocations of {@link #get()} |
2092 |
* and related methods to throw the given exception. |
2093 |
* |
2094 |
* @param ex the exception |
2095 |
* @return {@code true} if this invocation caused this CompletableFuture |
2096 |
* to transition to a completed state, else {@code false} |
2097 |
*/ |
2098 |
public boolean completeExceptionally(Throwable ex) { |
2099 |
if (ex == null) throw new NullPointerException(); |
2100 |
boolean triggered = internalComplete(new AltResult(ex)); |
2101 |
postComplete(); |
2102 |
return triggered; |
2103 |
} |
2104 |
|
2105 |
public <U> CompletableFuture<U> thenApply( |
2106 |
Function<? super T,? extends U> fn) { |
2107 |
return uniApplyStage(null, fn); |
2108 |
} |
2109 |
|
2110 |
public <U> CompletableFuture<U> thenApplyAsync( |
2111 |
Function<? super T,? extends U> fn) { |
2112 |
return uniApplyStage(defaultExecutor(), fn); |
2113 |
} |
2114 |
|
2115 |
public <U> CompletableFuture<U> thenApplyAsync( |
2116 |
Function<? super T,? extends U> fn, Executor executor) { |
2117 |
return uniApplyStage(screenExecutor(executor), fn); |
2118 |
} |
2119 |
|
2120 |
public CompletableFuture<Void> thenAccept(Consumer<? super T> action) { |
2121 |
return uniAcceptStage(null, action); |
2122 |
} |
2123 |
|
2124 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> action) { |
2125 |
return uniAcceptStage(defaultExecutor(), action); |
2126 |
} |
2127 |
|
2128 |
public CompletableFuture<Void> thenAcceptAsync(Consumer<? super T> action, |
2129 |
Executor executor) { |
2130 |
return uniAcceptStage(screenExecutor(executor), action); |
2131 |
} |
2132 |
|
2133 |
public CompletableFuture<Void> thenRun(Runnable action) { |
2134 |
return uniRunStage(null, action); |
2135 |
} |
2136 |
|
2137 |
public CompletableFuture<Void> thenRunAsync(Runnable action) { |
2138 |
return uniRunStage(defaultExecutor(), action); |
2139 |
} |
2140 |
|
2141 |
public CompletableFuture<Void> thenRunAsync(Runnable action, |
2142 |
Executor executor) { |
2143 |
return uniRunStage(screenExecutor(executor), action); |
2144 |
} |
2145 |
|
2146 |
public <U,V> CompletableFuture<V> thenCombine( |
2147 |
CompletionStage<? extends U> other, |
2148 |
BiFunction<? super T,? super U,? extends V> fn) { |
2149 |
return biApplyStage(null, other, fn); |
2150 |
} |
2151 |
|
2152 |
public <U,V> CompletableFuture<V> thenCombineAsync( |
2153 |
CompletionStage<? extends U> other, |
2154 |
BiFunction<? super T,? super U,? extends V> fn) { |
2155 |
return biApplyStage(defaultExecutor(), other, fn); |
2156 |
} |
2157 |
|
2158 |
public <U,V> CompletableFuture<V> thenCombineAsync( |
2159 |
CompletionStage<? extends U> other, |
2160 |
BiFunction<? super T,? super U,? extends V> fn, Executor executor) { |
2161 |
return biApplyStage(screenExecutor(executor), other, fn); |
2162 |
} |
2163 |
|
2164 |
public <U> CompletableFuture<Void> thenAcceptBoth( |
2165 |
CompletionStage<? extends U> other, |
2166 |
BiConsumer<? super T, ? super U> action) { |
2167 |
return biAcceptStage(null, other, action); |
2168 |
} |
2169 |
|
2170 |
public <U> CompletableFuture<Void> thenAcceptBothAsync( |
2171 |
CompletionStage<? extends U> other, |
2172 |
BiConsumer<? super T, ? super U> action) { |
2173 |
return biAcceptStage(defaultExecutor(), other, action); |
2174 |
} |
2175 |
|
2176 |
public <U> CompletableFuture<Void> thenAcceptBothAsync( |
2177 |
CompletionStage<? extends U> other, |
2178 |
BiConsumer<? super T, ? super U> action, Executor executor) { |
2179 |
return biAcceptStage(screenExecutor(executor), other, action); |
2180 |
} |
2181 |
|
2182 |
public CompletableFuture<Void> runAfterBoth(CompletionStage<?> other, |
2183 |
Runnable action) { |
2184 |
return biRunStage(null, other, action); |
2185 |
} |
2186 |
|
2187 |
public CompletableFuture<Void> runAfterBothAsync(CompletionStage<?> other, |
2188 |
Runnable action) { |
2189 |
return biRunStage(defaultExecutor(), other, action); |
2190 |
} |
2191 |
|
2192 |
public CompletableFuture<Void> runAfterBothAsync(CompletionStage<?> other, |
2193 |
Runnable action, |
2194 |
Executor executor) { |
2195 |
return biRunStage(screenExecutor(executor), other, action); |
2196 |
} |
2197 |
|
2198 |
public <U> CompletableFuture<U> applyToEither( |
2199 |
CompletionStage<? extends T> other, Function<? super T, U> fn) { |
2200 |
return orApplyStage(null, other, fn); |
2201 |
} |
2202 |
|
2203 |
public <U> CompletableFuture<U> applyToEitherAsync( |
2204 |
CompletionStage<? extends T> other, Function<? super T, U> fn) { |
2205 |
return orApplyStage(defaultExecutor(), other, fn); |
2206 |
} |
2207 |
|
2208 |
public <U> CompletableFuture<U> applyToEitherAsync( |
2209 |
CompletionStage<? extends T> other, Function<? super T, U> fn, |
2210 |
Executor executor) { |
2211 |
return orApplyStage(screenExecutor(executor), other, fn); |
2212 |
} |
2213 |
|
2214 |
public CompletableFuture<Void> acceptEither( |
2215 |
CompletionStage<? extends T> other, Consumer<? super T> action) { |
2216 |
return orAcceptStage(null, other, action); |
2217 |
} |
2218 |
|
2219 |
public CompletableFuture<Void> acceptEitherAsync( |
2220 |
CompletionStage<? extends T> other, Consumer<? super T> action) { |
2221 |
return orAcceptStage(defaultExecutor(), other, action); |
2222 |
} |
2223 |
|
2224 |
public CompletableFuture<Void> acceptEitherAsync( |
2225 |
CompletionStage<? extends T> other, Consumer<? super T> action, |
2226 |
Executor executor) { |
2227 |
return orAcceptStage(screenExecutor(executor), other, action); |
2228 |
} |
2229 |
|
2230 |
public CompletableFuture<Void> runAfterEither(CompletionStage<?> other, |
2231 |
Runnable action) { |
2232 |
return orRunStage(null, other, action); |
2233 |
} |
2234 |
|
2235 |
public CompletableFuture<Void> runAfterEitherAsync(CompletionStage<?> other, |
2236 |
Runnable action) { |
2237 |
return orRunStage(defaultExecutor(), other, action); |
2238 |
} |
2239 |
|
2240 |
public CompletableFuture<Void> runAfterEitherAsync(CompletionStage<?> other, |
2241 |
Runnable action, |
2242 |
Executor executor) { |
2243 |
return orRunStage(screenExecutor(executor), other, action); |
2244 |
} |
2245 |
|
2246 |
public <U> CompletableFuture<U> thenCompose( |
2247 |
Function<? super T, ? extends CompletionStage<U>> fn) { |
2248 |
return uniComposeStage(null, fn); |
2249 |
} |
2250 |
|
2251 |
public <U> CompletableFuture<U> thenComposeAsync( |
2252 |
Function<? super T, ? extends CompletionStage<U>> fn) { |
2253 |
return uniComposeStage(defaultExecutor(), fn); |
2254 |
} |
2255 |
|
2256 |
public <U> CompletableFuture<U> thenComposeAsync( |
2257 |
Function<? super T, ? extends CompletionStage<U>> fn, |
2258 |
Executor executor) { |
2259 |
return uniComposeStage(screenExecutor(executor), fn); |
2260 |
} |
2261 |
|
2262 |
public CompletableFuture<T> whenComplete( |
2263 |
BiConsumer<? super T, ? super Throwable> action) { |
2264 |
return uniWhenCompleteStage(null, action); |
2265 |
} |
2266 |
|
2267 |
public CompletableFuture<T> whenCompleteAsync( |
2268 |
BiConsumer<? super T, ? super Throwable> action) { |
2269 |
return uniWhenCompleteStage(defaultExecutor(), action); |
2270 |
} |
2271 |
|
2272 |
public CompletableFuture<T> whenCompleteAsync( |
2273 |
BiConsumer<? super T, ? super Throwable> action, Executor executor) { |
2274 |
return uniWhenCompleteStage(screenExecutor(executor), action); |
2275 |
} |
2276 |
|
2277 |
public <U> CompletableFuture<U> handle( |
2278 |
BiFunction<? super T, Throwable, ? extends U> fn) { |
2279 |
return uniHandleStage(null, fn); |
2280 |
} |
2281 |
|
2282 |
public <U> CompletableFuture<U> handleAsync( |
2283 |
BiFunction<? super T, Throwable, ? extends U> fn) { |
2284 |
return uniHandleStage(defaultExecutor(), fn); |
2285 |
} |
2286 |
|
2287 |
public <U> CompletableFuture<U> handleAsync( |
2288 |
BiFunction<? super T, Throwable, ? extends U> fn, Executor executor) { |
2289 |
return uniHandleStage(screenExecutor(executor), fn); |
2290 |
} |
2291 |
|
2292 |
/** |
2293 |
* Returns this CompletableFuture. |
2294 |
* |
2295 |
* @return this CompletableFuture |
2296 |
*/ |
2297 |
public CompletableFuture<T> toCompletableFuture() { |
2298 |
return this; |
2299 |
} |
2300 |
|
2301 |
// not in interface CompletionStage |
2302 |
|
2303 |
/** |
2304 |
* Returns a new CompletableFuture that is completed when this |
2305 |
* CompletableFuture completes, with the result of the given |
2306 |
* function of the exception triggering this CompletableFuture's |
2307 |
* completion when it completes exceptionally; otherwise, if this |
2308 |
* CompletableFuture completes normally, then the returned |
2309 |
* CompletableFuture also completes normally with the same value. |
2310 |
* Note: More flexible versions of this functionality are |
2311 |
* available using methods {@code whenComplete} and {@code handle}. |
2312 |
* |
2313 |
* @param fn the function to use to compute the value of the |
2314 |
* returned CompletableFuture if this CompletableFuture completed |
2315 |
* exceptionally |
2316 |
* @return the new CompletableFuture |
2317 |
*/ |
2318 |
public CompletableFuture<T> exceptionally( |
2319 |
Function<Throwable, ? extends T> fn) { |
2320 |
return uniExceptionallyStage(fn); |
2321 |
} |
2322 |
|
2323 |
|
2324 |
/* ------------- Arbitrary-arity constructions -------------- */ |
2325 |
|
2326 |
/** |
2327 |
* Returns a new CompletableFuture that is completed when all of |
2328 |
* the given CompletableFutures complete. If any of the given |
2329 |
* CompletableFutures complete exceptionally, then the returned |
2330 |
* CompletableFuture also does so, with a CompletionException |
2331 |
* holding this exception as its cause. Otherwise, the results, |
2332 |
* if any, of the given CompletableFutures are not reflected in |
2333 |
* the returned CompletableFuture, but may be obtained by |
2334 |
* inspecting them individually. If no CompletableFutures are |
2335 |
* provided, returns a CompletableFuture completed with the value |
2336 |
* {@code null}. |
2337 |
* |
2338 |
* <p>Among the applications of this method is to await completion |
2339 |
* of a set of independent CompletableFutures before continuing a |
2340 |
* program, as in: {@code CompletableFuture.allOf(c1, c2, |
2341 |
* c3).join();}. |
2342 |
* |
2343 |
* @param cfs the CompletableFutures |
2344 |
* @return a new CompletableFuture that is completed when all of the |
2345 |
* given CompletableFutures complete |
2346 |
* @throws NullPointerException if the array or any of its elements are |
2347 |
* {@code null} |
2348 |
*/ |
2349 |
public static CompletableFuture<Void> allOf(CompletableFuture<?>... cfs) { |
2350 |
return andTree(cfs, 0, cfs.length - 1); |
2351 |
} |
2352 |
|
2353 |
/** |
2354 |
* Returns a new CompletableFuture that is completed when any of |
2355 |
* the given CompletableFutures complete, with the same result. |
2356 |
* Otherwise, if it completed exceptionally, the returned |
2357 |
* CompletableFuture also does so, with a CompletionException |
2358 |
* holding this exception as its cause. If no CompletableFutures |
2359 |
* are provided, returns an incomplete CompletableFuture. |
2360 |
* |
2361 |
* @param cfs the CompletableFutures |
2362 |
* @return a new CompletableFuture that is completed with the |
2363 |
* result or exception of any of the given CompletableFutures when |
2364 |
* one completes |
2365 |
* @throws NullPointerException if the array or any of its elements are |
2366 |
* {@code null} |
2367 |
*/ |
2368 |
public static CompletableFuture<Object> anyOf(CompletableFuture<?>... cfs) { |
2369 |
return orTree(cfs, 0, cfs.length - 1); |
2370 |
} |
2371 |
|
2372 |
/* ------------- Control and status methods -------------- */ |
2373 |
|
2374 |
/** |
2375 |
* If not already completed, completes this CompletableFuture with |
2376 |
* a {@link CancellationException}. Dependent CompletableFutures |
2377 |
* that have not already completed will also complete |
2378 |
* exceptionally, with a {@link CompletionException} caused by |
2379 |
* this {@code CancellationException}. |
2380 |
* |
2381 |
* @param mayInterruptIfRunning this value has no effect in this |
2382 |
* implementation because interrupts are not used to control |
2383 |
* processing. |
2384 |
* |
2385 |
* @return {@code true} if this task is now cancelled |
2386 |
*/ |
2387 |
public boolean cancel(boolean mayInterruptIfRunning) { |
2388 |
boolean cancelled = (result == null) && |
2389 |
internalComplete(new AltResult(new CancellationException())); |
2390 |
postComplete(); |
2391 |
return cancelled || isCancelled(); |
2392 |
} |
2393 |
|
2394 |
/** |
2395 |
* Returns {@code true} if this CompletableFuture was cancelled |
2396 |
* before it completed normally. |
2397 |
* |
2398 |
* @return {@code true} if this CompletableFuture was cancelled |
2399 |
* before it completed normally |
2400 |
*/ |
2401 |
public boolean isCancelled() { |
2402 |
Object r; |
2403 |
return ((r = result) instanceof AltResult) && |
2404 |
(((AltResult)r).ex instanceof CancellationException); |
2405 |
} |
2406 |
|
2407 |
/** |
2408 |
* Returns {@code true} if this CompletableFuture completed |
2409 |
* exceptionally, in any way. Possible causes include |
2410 |
* cancellation, explicit invocation of {@code |
2411 |
* completeExceptionally}, and abrupt termination of a |
2412 |
* CompletionStage action. |
2413 |
* |
2414 |
* @return {@code true} if this CompletableFuture completed |
2415 |
* exceptionally |
2416 |
*/ |
2417 |
public boolean isCompletedExceptionally() { |
2418 |
Object r; |
2419 |
return ((r = result) instanceof AltResult) && r != NIL; |
2420 |
} |
2421 |
|
2422 |
/** |
2423 |
* Forcibly sets or resets the value subsequently returned by |
2424 |
* method {@link #get()} and related methods, whether or not |
2425 |
* already completed. This method is designed for use only in |
2426 |
* error recovery actions, and even in such situations may result |
2427 |
* in ongoing dependent completions using established versus |
2428 |
* overwritten outcomes. |
2429 |
* |
2430 |
* @param value the completion value |
2431 |
*/ |
2432 |
public void obtrudeValue(T value) { |
2433 |
result = (value == null) ? NIL : value; |
2434 |
postComplete(); |
2435 |
} |
2436 |
|
2437 |
/** |
2438 |
* Forcibly causes subsequent invocations of method {@link #get()} |
2439 |
* and related methods to throw the given exception, whether or |
2440 |
* not already completed. This method is designed for use only in |
2441 |
* error recovery actions, and even in such situations may result |
2442 |
* in ongoing dependent completions using established versus |
2443 |
* overwritten outcomes. |
2444 |
* |
2445 |
* @param ex the exception |
2446 |
* @throws NullPointerException if the exception is null |
2447 |
*/ |
2448 |
public void obtrudeException(Throwable ex) { |
2449 |
if (ex == null) throw new NullPointerException(); |
2450 |
result = new AltResult(ex); |
2451 |
postComplete(); |
2452 |
} |
2453 |
|
2454 |
/** |
2455 |
* Returns the estimated number of CompletableFutures whose |
2456 |
* completions are awaiting completion of this CompletableFuture. |
2457 |
* This method is designed for use in monitoring system state, not |
2458 |
* for synchronization control. |
2459 |
* |
2460 |
* @return the number of dependent CompletableFutures |
2461 |
*/ |
2462 |
public int getNumberOfDependents() { |
2463 |
int count = 0; |
2464 |
for (Completion p = stack; p != null; p = p.next) |
2465 |
++count; |
2466 |
return count; |
2467 |
} |
2468 |
|
2469 |
/** |
2470 |
* Returns a string identifying this CompletableFuture, as well as |
2471 |
* its completion state. The state, in brackets, contains the |
2472 |
* String {@code "Completed Normally"} or the String {@code |
2473 |
* "Completed Exceptionally"}, or the String {@code "Not |
2474 |
* completed"} followed by the number of CompletableFutures |
2475 |
* dependent upon its completion, if any. |
2476 |
* |
2477 |
* @return a string identifying this CompletableFuture, as well as its state |
2478 |
*/ |
2479 |
public String toString() { |
2480 |
Object r = result; |
2481 |
int count = 0; // avoid call to getNumberOfDependents in case disabled |
2482 |
for (Completion p = stack; p != null; p = p.next) |
2483 |
++count; |
2484 |
return super.toString() + |
2485 |
((r == null) ? |
2486 |
((count == 0) ? |
2487 |
"[Not completed]" : |
2488 |
"[Not completed, " + count + " dependents]") : |
2489 |
(((r instanceof AltResult) && ((AltResult)r).ex != null) ? |
2490 |
"[Completed exceptionally]" : |
2491 |
"[Completed normally]")); |
2492 |
} |
2493 |
|
2494 |
// jdk9 additions |
2495 |
|
2496 |
/** |
2497 |
* Returns a new incomplete CompletableFuture of the type to be |
2498 |
* returned by a CompletionStage method. Subclasses should |
2499 |
* normally override this method to return an instance of the same |
2500 |
* class as this CompletableFuture. The default implementation |
2501 |
* returns an instance of class CompletableFuture. |
2502 |
* |
2503 |
* @param <U> the type of the value |
2504 |
* @return a new CompletableFuture |
2505 |
* @since 9 |
2506 |
*/ |
2507 |
public <U> CompletableFuture<U> newIncompleteFuture() { |
2508 |
return new CompletableFuture<U>(); |
2509 |
} |
2510 |
|
2511 |
/** |
2512 |
* Returns the default Executor used for async methods that do not |
2513 |
* specify an Executor. This class uses the {@link |
2514 |
* ForkJoinPool#commonPool()} if it supports more than one |
2515 |
* parallel thread, or else an Executor using one thread per async |
2516 |
* task. This method may be overridden in subclasses to return |
2517 |
* an Executor that provides at least one independent thread. |
2518 |
* |
2519 |
* @return the executor |
2520 |
* @since 9 |
2521 |
*/ |
2522 |
public Executor defaultExecutor() { |
2523 |
return ASYNC_POOL; |
2524 |
} |
2525 |
|
2526 |
/** |
2527 |
* Returns a new CompletableFuture that is completed normally with |
2528 |
* the same value as this CompletableFuture when it completes |
2529 |
* normally. If this CompletableFuture completes exceptionally, |
2530 |
* then the returned CompletableFuture completes exceptionally |
2531 |
* with a CompletionException with this exception as cause. The |
2532 |
* behavior is equivalent to {@code thenApply(x -> x)}. This |
2533 |
* method may be useful as a form of "defensive copying", to |
2534 |
* prevent clients from completing, while still being able to |
2535 |
* arrange dependent actions. |
2536 |
* |
2537 |
* @return the new CompletableFuture |
2538 |
* @since 9 |
2539 |
*/ |
2540 |
public CompletableFuture<T> copy() { |
2541 |
return uniCopyStage(); |
2542 |
} |
2543 |
|
2544 |
/** |
2545 |
* Returns a new CompletionStage that is completed normally with |
2546 |
* the same value as this CompletableFuture when it completes |
2547 |
* normally, and cannot be independently completed or otherwise |
2548 |
* used in ways not defined by the methods of interface {@link |
2549 |
* CompletionStage}. If this CompletableFuture completes |
2550 |
* exceptionally, then the returned CompletionStage completes |
2551 |
* exceptionally with a CompletionException with this exception as |
2552 |
* cause. |
2553 |
* |
2554 |
* @return the new CompletionStage |
2555 |
* @since 9 |
2556 |
*/ |
2557 |
public CompletionStage<T> minimalCompletionStage() { |
2558 |
return uniAsMinimalStage(); |
2559 |
} |
2560 |
|
2561 |
/** |
2562 |
* Completes this CompletableFuture with the result of |
2563 |
* the given Supplier function invoked from an asynchronous |
2564 |
* task using the given executor. |
2565 |
* |
2566 |
* @param supplier a function returning the value to be used |
2567 |
* to complete this CompletableFuture |
2568 |
* @param executor the executor to use for asynchronous execution |
2569 |
* @return this CompletableFuture |
2570 |
* @since 9 |
2571 |
*/ |
2572 |
public CompletableFuture<T> completeAsync(Supplier<? extends T> supplier, |
2573 |
Executor executor) { |
2574 |
if (supplier == null || executor == null) |
2575 |
throw new NullPointerException(); |
2576 |
executor.execute(new AsyncSupply<T>(this, supplier)); |
2577 |
return this; |
2578 |
} |
2579 |
|
2580 |
/** |
2581 |
* Completes this CompletableFuture with the result of the given |
2582 |
* Supplier function invoked from an asynchronous task using the |
2583 |
* default executor. |
2584 |
* |
2585 |
* @param supplier a function returning the value to be used |
2586 |
* to complete this CompletableFuture |
2587 |
* @return this CompletableFuture |
2588 |
* @since 9 |
2589 |
*/ |
2590 |
public CompletableFuture<T> completeAsync(Supplier<? extends T> supplier) { |
2591 |
return completeAsync(supplier, defaultExecutor()); |
2592 |
} |
2593 |
|
2594 |
/** |
2595 |
* Exceptionally completes this CompletableFuture with |
2596 |
* a {@link TimeoutException} if not otherwise completed |
2597 |
* before the given timeout. |
2598 |
* |
2599 |
* @param timeout how long to wait before completing exceptionally |
2600 |
* with a TimeoutException, in units of {@code unit} |
2601 |
* @param unit a {@code TimeUnit} determining how to interpret the |
2602 |
* {@code timeout} parameter |
2603 |
* @return this CompletableFuture |
2604 |
* @since 9 |
2605 |
*/ |
2606 |
public CompletableFuture<T> orTimeout(long timeout, TimeUnit unit) { |
2607 |
if (unit == null) |
2608 |
throw new NullPointerException(); |
2609 |
if (result == null) |
2610 |
whenComplete(new Canceller(Delayer.delay(new Timeout(this), |
2611 |
timeout, unit))); |
2612 |
return this; |
2613 |
} |
2614 |
|
2615 |
/** |
2616 |
* Completes this CompletableFuture with the given value if not |
2617 |
* otherwise completed before the given timeout. |
2618 |
* |
2619 |
* @param value the value to use upon timeout |
2620 |
* @param timeout how long to wait before completing normally |
2621 |
* with the given value, in units of {@code unit} |
2622 |
* @param unit a {@code TimeUnit} determining how to interpret the |
2623 |
* {@code timeout} parameter |
2624 |
* @return this CompletableFuture |
2625 |
* @since 9 |
2626 |
*/ |
2627 |
public CompletableFuture<T> completeOnTimeout(T value, long timeout, |
2628 |
TimeUnit unit) { |
2629 |
if (unit == null) |
2630 |
throw new NullPointerException(); |
2631 |
if (result == null) |
2632 |
whenComplete(new Canceller(Delayer.delay( |
2633 |
new DelayedCompleter<T>(this, value), |
2634 |
timeout, unit))); |
2635 |
return this; |
2636 |
} |
2637 |
|
2638 |
/** |
2639 |
* Returns a new Executor that submits a task to the given base |
2640 |
* executor after the given delay (or no delay if non-positive). |
2641 |
* Each delay commences upon invocation of the returned executor's |
2642 |
* {@code execute} method. |
2643 |
* |
2644 |
* @param delay how long to delay, in units of {@code unit} |
2645 |
* @param unit a {@code TimeUnit} determining how to interpret the |
2646 |
* {@code delay} parameter |
2647 |
* @param executor the base executor |
2648 |
* @return the new delayed executor |
2649 |
* @since 9 |
2650 |
*/ |
2651 |
public static Executor delayedExecutor(long delay, TimeUnit unit, |
2652 |
Executor executor) { |
2653 |
if (unit == null || executor == null) |
2654 |
throw new NullPointerException(); |
2655 |
return new DelayedExecutor(delay, unit, executor); |
2656 |
} |
2657 |
|
2658 |
/** |
2659 |
* Returns a new Executor that submits a task to the default |
2660 |
* executor after the given delay (or no delay if non-positive). |
2661 |
* Each delay commences upon invocation of the returned executor's |
2662 |
* {@code execute} method. |
2663 |
* |
2664 |
* @param delay how long to delay, in units of {@code unit} |
2665 |
* @param unit a {@code TimeUnit} determining how to interpret the |
2666 |
* {@code delay} parameter |
2667 |
* @return the new delayed executor |
2668 |
* @since 9 |
2669 |
*/ |
2670 |
public static Executor delayedExecutor(long delay, TimeUnit unit) { |
2671 |
if (unit == null) |
2672 |
throw new NullPointerException(); |
2673 |
return new DelayedExecutor(delay, unit, ASYNC_POOL); |
2674 |
} |
2675 |
|
2676 |
/** |
2677 |
* Returns a new CompletionStage that is already completed with |
2678 |
* the given value and supports only those methods in |
2679 |
* interface {@link CompletionStage}. |
2680 |
* |
2681 |
* @param value the value |
2682 |
* @param <U> the type of the value |
2683 |
* @return the completed CompletionStage |
2684 |
* @since 9 |
2685 |
*/ |
2686 |
public static <U> CompletionStage<U> completedStage(U value) { |
2687 |
return new MinimalStage<U>((value == null) ? NIL : value); |
2688 |
} |
2689 |
|
2690 |
/** |
2691 |
* Returns a new CompletableFuture that is already completed |
2692 |
* exceptionally with the given exception. |
2693 |
* |
2694 |
* @param ex the exception |
2695 |
* @param <U> the type of the value |
2696 |
* @return the exceptionally completed CompletableFuture |
2697 |
* @since 9 |
2698 |
*/ |
2699 |
public static <U> CompletableFuture<U> failedFuture(Throwable ex) { |
2700 |
if (ex == null) throw new NullPointerException(); |
2701 |
return new CompletableFuture<U>(new AltResult(ex)); |
2702 |
} |
2703 |
|
2704 |
/** |
2705 |
* Returns a new CompletionStage that is already completed |
2706 |
* exceptionally with the given exception and supports only those |
2707 |
* methods in interface {@link CompletionStage}. |
2708 |
* |
2709 |
* @param ex the exception |
2710 |
* @param <U> the type of the value |
2711 |
* @return the exceptionally completed CompletionStage |
2712 |
* @since 9 |
2713 |
*/ |
2714 |
public static <U> CompletionStage<U> failedStage(Throwable ex) { |
2715 |
if (ex == null) throw new NullPointerException(); |
2716 |
return new MinimalStage<U>(new AltResult(ex)); |
2717 |
} |
2718 |
|
2719 |
/** |
2720 |
* Singleton delay scheduler, used only for starting and |
2721 |
* cancelling tasks. |
2722 |
*/ |
2723 |
static final class Delayer { |
2724 |
static ScheduledFuture<?> delay(Runnable command, long delay, |
2725 |
TimeUnit unit) { |
2726 |
return delayer.schedule(command, delay, unit); |
2727 |
} |
2728 |
|
2729 |
static final class DaemonThreadFactory implements ThreadFactory { |
2730 |
public Thread newThread(Runnable r) { |
2731 |
Thread t = new Thread(r); |
2732 |
t.setDaemon(true); |
2733 |
t.setName("CompletableFutureDelayScheduler"); |
2734 |
return t; |
2735 |
} |
2736 |
} |
2737 |
|
2738 |
static final ScheduledThreadPoolExecutor delayer; |
2739 |
static { |
2740 |
(delayer = new ScheduledThreadPoolExecutor( |
2741 |
1, new DaemonThreadFactory())). |
2742 |
setRemoveOnCancelPolicy(true); |
2743 |
} |
2744 |
} |
2745 |
|
2746 |
// Little class-ified lambdas to better support monitoring |
2747 |
|
2748 |
static final class DelayedExecutor implements Executor { |
2749 |
final long delay; |
2750 |
final TimeUnit unit; |
2751 |
final Executor executor; |
2752 |
DelayedExecutor(long delay, TimeUnit unit, Executor executor) { |
2753 |
this.delay = delay; this.unit = unit; this.executor = executor; |
2754 |
} |
2755 |
public void execute(Runnable r) { |
2756 |
Delayer.delay(new TaskSubmitter(executor, r), delay, unit); |
2757 |
} |
2758 |
} |
2759 |
|
2760 |
/** Action to submit user task */ |
2761 |
static final class TaskSubmitter implements Runnable { |
2762 |
final Executor executor; |
2763 |
final Runnable action; |
2764 |
TaskSubmitter(Executor executor, Runnable action) { |
2765 |
this.executor = executor; |
2766 |
this.action = action; |
2767 |
} |
2768 |
public void run() { executor.execute(action); } |
2769 |
} |
2770 |
|
2771 |
/** Action to completeExceptionally on timeout */ |
2772 |
static final class Timeout implements Runnable { |
2773 |
final CompletableFuture<?> f; |
2774 |
Timeout(CompletableFuture<?> f) { this.f = f; } |
2775 |
public void run() { |
2776 |
if (f != null && !f.isDone()) |
2777 |
f.completeExceptionally(new TimeoutException()); |
2778 |
} |
2779 |
} |
2780 |
|
2781 |
/** Action to complete on timeout */ |
2782 |
static final class DelayedCompleter<U> implements Runnable { |
2783 |
final CompletableFuture<U> f; |
2784 |
final U u; |
2785 |
DelayedCompleter(CompletableFuture<U> f, U u) { this.f = f; this.u = u; } |
2786 |
public void run() { |
2787 |
if (f != null) |
2788 |
f.complete(u); |
2789 |
} |
2790 |
} |
2791 |
|
2792 |
/** Action to cancel unneeded timeouts */ |
2793 |
static final class Canceller implements BiConsumer<Object, Throwable> { |
2794 |
final Future<?> f; |
2795 |
Canceller(Future<?> f) { this.f = f; } |
2796 |
public void accept(Object ignore, Throwable ex) { |
2797 |
if (ex == null && f != null && !f.isDone()) |
2798 |
f.cancel(false); |
2799 |
} |
2800 |
} |
2801 |
|
2802 |
/** |
2803 |
* A subclass that just throws UOE for most non-CompletionStage methods. |
2804 |
*/ |
2805 |
static final class MinimalStage<T> extends CompletableFuture<T> { |
2806 |
MinimalStage() { } |
2807 |
MinimalStage(Object r) { super(r); } |
2808 |
@Override public <U> CompletableFuture<U> newIncompleteFuture() { |
2809 |
return new MinimalStage<U>(); } |
2810 |
@Override public T get() { |
2811 |
throw new UnsupportedOperationException(); } |
2812 |
@Override public T get(long timeout, TimeUnit unit) { |
2813 |
throw new UnsupportedOperationException(); } |
2814 |
@Override public T getNow(T valueIfAbsent) { |
2815 |
throw new UnsupportedOperationException(); } |
2816 |
@Override public T join() { |
2817 |
throw new UnsupportedOperationException(); } |
2818 |
@Override public boolean complete(T value) { |
2819 |
throw new UnsupportedOperationException(); } |
2820 |
@Override public boolean completeExceptionally(Throwable ex) { |
2821 |
throw new UnsupportedOperationException(); } |
2822 |
@Override public boolean cancel(boolean mayInterruptIfRunning) { |
2823 |
throw new UnsupportedOperationException(); } |
2824 |
@Override public void obtrudeValue(T value) { |
2825 |
throw new UnsupportedOperationException(); } |
2826 |
@Override public void obtrudeException(Throwable ex) { |
2827 |
throw new UnsupportedOperationException(); } |
2828 |
@Override public boolean isDone() { |
2829 |
throw new UnsupportedOperationException(); } |
2830 |
@Override public boolean isCancelled() { |
2831 |
throw new UnsupportedOperationException(); } |
2832 |
@Override public boolean isCompletedExceptionally() { |
2833 |
throw new UnsupportedOperationException(); } |
2834 |
@Override public int getNumberOfDependents() { |
2835 |
throw new UnsupportedOperationException(); } |
2836 |
@Override public CompletableFuture<T> completeAsync |
2837 |
(Supplier<? extends T> supplier, Executor executor) { |
2838 |
throw new UnsupportedOperationException(); } |
2839 |
@Override public CompletableFuture<T> completeAsync |
2840 |
(Supplier<? extends T> supplier) { |
2841 |
throw new UnsupportedOperationException(); } |
2842 |
@Override public CompletableFuture<T> orTimeout |
2843 |
(long timeout, TimeUnit unit) { |
2844 |
throw new UnsupportedOperationException(); } |
2845 |
@Override public CompletableFuture<T> completeOnTimeout |
2846 |
(T value, long timeout, TimeUnit unit) { |
2847 |
throw new UnsupportedOperationException(); } |
2848 |
} |
2849 |
|
2850 |
// Unsafe mechanics |
2851 |
private static final sun.misc.Unsafe U = sun.misc.Unsafe.getUnsafe(); |
2852 |
private static final long RESULT; |
2853 |
private static final long STACK; |
2854 |
private static final long NEXT; |
2855 |
static { |
2856 |
try { |
2857 |
RESULT = U.objectFieldOffset |
2858 |
(CompletableFuture.class.getDeclaredField("result")); |
2859 |
STACK = U.objectFieldOffset |
2860 |
(CompletableFuture.class.getDeclaredField("stack")); |
2861 |
NEXT = U.objectFieldOffset |
2862 |
(Completion.class.getDeclaredField("next")); |
2863 |
} catch (ReflectiveOperationException e) { |
2864 |
throw new Error(e); |
2865 |
} |
2866 |
|
2867 |
// Reduce the risk of rare disastrous classloading in first call to |
2868 |
// LockSupport.park: https://bugs.openjdk.java.net/browse/JDK-8074773 |
2869 |
Class<?> ensureLoaded = LockSupport.class; |
2870 |
} |
2871 |
} |