Package com.google.common.util.concurrent

Class AbstractListeningExecutorService

java.lang.Object

java.util.concurrent.AbstractExecutorService

com.google.common.util.concurrent.AbstractListeningExecutorService

All Implemented Interfaces:

ListeningExecutorService, Executor, ExecutorService

@Beta
@CanIgnoreReturnValue
@GwtIncompatible
public abstract class AbstractListeningExecutorService
extends AbstractExecutorService
implements ListeningExecutorService

Abstract ListeningExecutorService implementation that creates ListenableFuture instances for each Runnable and Callable submitted to it. These tasks are run with the abstract execute(Runnable) method.

In addition to Executor.execute(java.lang.Runnable), subclasses must implement all methods related to shutdown and termination.

Since:

14.0

Author:

Chris Povirk

Constructor Summary

Constructors

Constructor	Description
AbstractListeningExecutorService()

Method Summary

Modifier and Type	Method	Description
protected <T extends @Nullable Object> RunnableFuture<T>	newTaskFor(Runnable runnable, T value)	Returns a RunnableFuture for the given runnable and default value.
protected <T extends @Nullable Object> RunnableFuture<T>	newTaskFor(Callable<T> callable)	Returns a RunnableFuture for the given callable task.
ListenableFuture<?>	submit(Runnable task)	Submits a Runnable task for execution and returns a Future representing that task.
<T extends @Nullable Object> ListenableFuture<T>	submit(Runnable task, T result)	Submits a Runnable task for execution and returns a Future representing that task.
<T extends @Nullable Object> ListenableFuture<T>	submit(Callable<T> task)	Submits a value-returning task for execution and returns a Future representing the pending results of the task.

Methods inherited from class java.util.concurrent.AbstractExecutorService

invokeAll, invokeAll, invokeAny, invokeAny

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.concurrent.Executor

execute

Methods inherited from interface java.util.concurrent.ExecutorService

awaitTermination, invokeAny, invokeAny, isShutdown, isTerminated, shutdown, shutdownNow

Methods inherited from interface com.google.common.util.concurrent.ListeningExecutorService

invokeAll, invokeAll

Constructor Detail

AbstractListeningExecutorService

public AbstractListeningExecutorService()

Method Detail

newTaskFor

protected final <T extends @Nullable Object> RunnableFuture<T> newTaskFor(Runnable runnable,
                                                                          T value)

Description copied from class: java.util.concurrent.AbstractExecutorService

Returns a RunnableFuture for the given runnable and default value.

Overrides:

newTaskFor in class AbstractExecutorService

Type Parameters:

T - the type of the given value

Parameters:

runnable - the runnable task being wrapped

value - the default value for the returned future

Returns:

a RunnableFuture which, when run, will run the underlying runnable and which, as a Future, will yield the given value as its result and provide for cancellation of the underlying task

Since:

19.0 (present with return type ListenableFutureTask since 14.0)

newTaskFor

protected final <T extends @Nullable Object> RunnableFuture<T> newTaskFor(Callable<T> callable)

Description copied from class: java.util.concurrent.AbstractExecutorService

Returns a RunnableFuture for the given callable task.

Overrides:

newTaskFor in class AbstractExecutorService

Type Parameters:

T - the type of the callable's result

Parameters:

callable - the callable task being wrapped

Returns:

a RunnableFuture which, when run, will call the underlying callable and which, as a Future, will yield the callable's result as its result and provide for cancellation of the underlying task

Since:

19.0 (present with return type ListenableFutureTask since 14.0)

submit

public ListenableFuture<?> submit(Runnable task)

Description copied from interface: java.util.concurrent.ExecutorService

Submits a Runnable task for execution and returns a Future representing that task. The Future's get method will return null upon successful completion.

Specified by:

submit in interface ExecutorService

Specified by:

submit in interface ListeningExecutorService

Overrides:

submit in class AbstractExecutorService

Parameters:

task - the task to submit

Returns:

a Future representing pending completion of the task

submit

public <T extends @Nullable Object> ListenableFuture<T> submit(Runnable task,
                                                               T result)

Description copied from interface: java.util.concurrent.ExecutorService

Submits a Runnable task for execution and returns a Future representing that task. The Future's get method will return the given result upon successful completion.

Specified by:

submit in interface ExecutorService

Specified by:

submit in interface ListeningExecutorService

Overrides:

submit in class AbstractExecutorService

Type Parameters:

T - the type of the result

Parameters:

task - the task to submit

result - the result to return

Returns:

a Future representing pending completion of the task

submit

public <T extends @Nullable Object> ListenableFuture<T> submit(Callable<T> task)

Description copied from interface: java.util.concurrent.ExecutorService

Submits a value-returning task for execution and returns a Future representing the pending results of the task. The Future's get method will return the task's result upon successful completion.

If you would like to immediately block waiting for a task, you can use constructions of the form result = exec.submit(aCallable).get();

Note: The Executors class includes a set of methods that can convert some other common closure-like objects, for example, PrivilegedAction to Callable form so they can be submitted.

Specified by:

submit in interface ExecutorService

Specified by:

submit in interface ListeningExecutorService

Overrides:

submit in class AbstractExecutorService

Type Parameters:

T - the type of the task's result

Parameters:

task - the task to submit

Returns:

a Future representing pending completion of the task