Class JdkFutureAdapters.ListenableFutureAdapter<V>
- All Implemented Interfaces:
ListenableFuture<V>
,Future<V>
- Enclosing class:
JdkFutureAdapters
Future
into a ListenableFuture
. This will wait on the
future to finish, and when it completes, run the listeners. This implementation will wait on
the source future indefinitely, so if the source future never completes, the adapter will never
complete either.
If the delegate future is interrupted or throws an unexpected unchecked exception, the listeners will not be invoked.
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Nested Class Summary
Nested classes/interfaces inherited from class com.google.common.util.concurrent.ForwardingFuture
ForwardingFuture.SimpleForwardingFuture<V>
Nested classes/interfaces inherited from interface java.util.concurrent.Future
Future.State
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final Executor
private static final Executor
private final ExecutionList
private final AtomicBoolean
private static final ThreadFactory
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Constructor Summary
ConstructorsConstructorDescriptionListenableFutureAdapter
(Future<V> delegate) ListenableFutureAdapter
(Future<V> delegate, Executor adapterExecutor) -
Method Summary
Methods inherited from class com.google.common.util.concurrent.ForwardingFuture
cancel, get, get, isCancelled, isDone
Methods inherited from class com.google.common.collect.ForwardingObject
toString
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface java.util.concurrent.Future
cancel, exceptionNow, get, get, isCancelled, isDone, resultNow, state
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Field Details
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threadFactory
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defaultAdapterExecutor
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adapterExecutor
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executionList
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hasListeners
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delegate
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Constructor Details
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ListenableFutureAdapter
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ListenableFutureAdapter
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Method Details
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delegate
Description copied from class:ForwardingObject
Returns the backing delegate instance that methods are forwarded to. Abstract subclasses generally override this method with an abstract method that has a more specific return type, such asForwardingSet.delegate()
. Concrete subclasses override this method to supply the instance being decorated.- Specified by:
delegate
in classForwardingFuture<V>
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addListener
Description copied from interface:ListenableFuture
Registers a listener to be run on the given executor. The listener will run when theFuture
's computation is complete or, if the computation is already complete, immediately.There is no guaranteed ordering of execution of listeners, but any listener added through this method is guaranteed to be called once the computation is complete.
Exceptions thrown by a listener will be propagated up to the executor. Any exception thrown during
Executor.execute
(e.g., aRejectedExecutionException
or an exception thrown by direct execution) will be caught and logged.Note: If your listener is lightweight -- and will not cause stack overflow by completing more futures or adding more
directExecutor()
listeners inline -- considerMoreExecutors.directExecutor()
. Otherwise, avoid it: See the warnings on the docs fordirectExecutor
.This is the most general listener interface. For common operations performed using listeners, see
Futures
. For a simplified but general listener interface, seeaddCallback()
.Memory consistency effects: Actions in a thread prior to adding a listener happen-before its execution begins, perhaps in another thread.
Guava implementations of
ListenableFuture
promptly release references to listeners after executing them.- Specified by:
addListener
in interfaceListenableFuture<V>
- Parameters:
listener
- the listener to run when the computation is completeexec
- the executor to run the listener in
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