java.util.concurrent
Class AbstractExecutorService

java.lang.Object
  java.util.concurrent.AbstractExecutorService

All Implemented Interfaces:

Executor, ExecutorService

Direct Known Subclasses:

ThreadPoolExecutor

public abstract class AbstractExecutorService
extends Object
implements ExecutorService

Provides default implementation of ExecutorService execution methods. This class implements the submit, invokeAny and invokeAll methods using the default FutureTask class provided in this package. For example, the implementation of submit(Runnable) creates an associated FutureTask that is executed and returned. Subclasses overriding these methods to use different Future implementations should do so consistently for each of these methods.

Constructor Summary

AbstractExecutorService()

Method Summary

List	invokeAll(Collection tasks) Executes the given tasks, returning their results when all complete.
List	invokeAll(Collection tasks, long timeout, TimeUnit unit) Executes the given tasks, returning their results when all complete or the timeout expires, whichever happens first.
Object	invokeAny(Collection tasks) Executes the given tasks, returning the result of one that has completed successfully (i.e., without throwing an exception), if any do.
Object	invokeAny(Collection tasks, long timeout, TimeUnit unit) Executes the given tasks, returning the result of one that has completed successfully (i.e., without throwing an exception), if any do before the given timeout elapses.
Future	submit(Callable task) Submits a value-returning task for execution and returns a Future representing the pending results of the task.
Future	submit(Runnable task) Submits a Runnable task for execution and returns a Future representing that task.
Future	submit(Runnable task, Object result) Submits a Runnable task for execution and returns a Future representing that task that will upon completion return the given result.

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.ExecutorService

awaitTermination, isShutdown, isTerminated, shutdown, shutdownNow

Methods inherited from interface java.util.concurrent.Executor

execute

Constructor Detail

AbstractExecutorService

public AbstractExecutorService()

Method Detail

submit

public Future submit(Runnable task)

Submits a Runnable task for execution and returns a Future representing that task.

Specified by:

submit in interface ExecutorService

submit

public Future submit(Runnable task,
                     Object result)

Submits a Runnable task for execution and returns a Future representing that task that will upon completion return the given result.

Specified by:

submit in interface ExecutorService

submit

public Future submit(Callable task)

Submits a value-returning task for execution and returns a Future representing the pending results of the task.

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

invokeAny

public Object invokeAny(Collection tasks)
                 throws InterruptedException,
                        ExecutionException

Executes the given tasks, returning the result of one that has completed successfully (i.e., without throwing an exception), if any do. Upon normal or exceptional return, tasks that have not completed are cancelled. The results of this method are undefined if the given collection is modified while this operation is in progress.

Specified by:

invokeAny in interface ExecutorService

Throws:

InterruptedException

ExecutionException

invokeAny

public Object invokeAny(Collection tasks,
                        long timeout,
                        TimeUnit unit)
                 throws InterruptedException,
                        ExecutionException,
                        TimeoutException

Executes the given tasks, returning the result of one that has completed successfully (i.e., without throwing an exception), if any do before the given timeout elapses. Upon normal or exceptional return, tasks that have not completed are cancelled. The results of this method are undefined if the given collection is modified while this operation is in progress.

Specified by:

invokeAny in interface ExecutorService

Throws:

InterruptedException

ExecutionException

TimeoutException

invokeAll

public List invokeAll(Collection tasks)
               throws InterruptedException

Executes the given tasks, returning their results when all complete. Note that a completed task could have terminated either normally or by throwing an exception. The results of this method are undefined if the given collection is modified while this operation is in progress.

Specified by:

invokeAll in interface ExecutorService

Throws:

InterruptedException

invokeAll

public List invokeAll(Collection tasks,
                      long timeout,
                      TimeUnit unit)
               throws InterruptedException

Executes the given tasks, returning their results when all complete or the timeout expires, whichever happens first. Upon return, tasks that have not completed are cancelled. Note that a completed task could have terminated either normally or by throwing an exception. The results of this method are undefined if the given collection is modified while this operation is in progress.

Specified by:

invokeAll in interface ExecutorService

Throws:

InterruptedException