java.util.concurrent.AbstractExecutorService
2014-03-17 05:32
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java.util.concurrent
java.lang.Object
java.util.concurrent.AbstractExecutorService
All Implemented Interfaces:Executor, ExecutorService
Direct Known Subclasses:ForkJoinPool, ThreadPoolExecutor
Provides default implementations of
methods. This class implements the submit, invokeAny and invokeAll methods using a
by newTaskFor, which defaults to the
provided in this package. For example, the implementation of submit(Runnable) creates an associated RunnableFuture that is executed and returned. Subclasses may override the newTaskFor methods
to return RunnableFuture implementations other than FutureTask.
Extension example. Here is a sketch of a class that customizes
use a CustomTask class instead of the default FutureTask:
Since:1.5
Constructors
Methods
Returns a RunnableFuture for the given runnable and default value.
Parameters:
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:1.6
Returns a RunnableFuture for the given callable task.
Parameters:
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:1.6
Description copied from interface:
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:
interface
Parameters:
Returns:a Future representing pending completion of the task
Throws:
if the task cannot be scheduled for execution
if the task is null
Description copied from interface:
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:
interface
Parameters:
Returns:a Future representing pending completion of the task
Throws:
if the task cannot be scheduled for execution
if the task is null
Description copied from interface:
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
includes a set of methods that can convert some other common closure-like objects, for example,
so they can be submitted.
Specified by:
interface
Parameters:
Returns:a Future representing pending completion of the task
Throws:
if the task cannot be scheduled for execution
if the task is null
Description copied from interface:
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:
interface
Parameters:
Returns:the result returned by one of the tasks
Throws:
if interrupted while waiting
if no task successfully completes
Description copied from interface:
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:
interface
Parameters:
Returns:the result returned by one of the tasks.
Throws:
if interrupted while waiting
if no task successfully completes
if the given timeout elapses before any task successfully completes
Description copied from interface:
Executes the given tasks, returning a list of Futures holding their status and results when all complete.
each element of the returned list. 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:
interface
Parameters:
Returns:A list of Futures representing the tasks, in the same sequential order as produced by the iterator for the given task list, each of which has completed.
Throws:
if interrupted while waiting, in which case unfinished tasks are cancelled.
Description copied from interface:
Executes the given tasks, returning a list of Futures holding their status and results when all complete or the timeout expires, whichever happens first.
each element of the returned list. 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:
interface
Parameters:
Returns:a list of Futures representing the tasks, in the same sequential order as produced by the iterator for the given task list. If the operation did not time out, each task will have completed. If it did time out, some of these
tasks will not have completed.
Throws:
if interrupted while waiting, in which case unfinished tasks are cancelled
Class AbstractExecutorService
java.lang.Objectjava.util.concurrent.AbstractExecutorService
All Implemented Interfaces:Executor, ExecutorService
Direct Known Subclasses:ForkJoinPool, ThreadPoolExecutor
public abstract class AbstractExecutorService extends Object implements ExecutorService
Provides default implementations of
ExecutorServiceexecution
methods. This class implements the submit, invokeAny and invokeAll methods using a
RunnableFuturereturned
by newTaskFor, which defaults to the
FutureTaskclass
provided in this package. For example, the implementation of submit(Runnable) creates an associated RunnableFuture that is executed and returned. Subclasses may override the newTaskFor methods
to return RunnableFuture implementations other than FutureTask.
Extension example. Here is a sketch of a class that customizes
ThreadPoolExecutorto
use a CustomTask class instead of the default FutureTask:
[code]public class CustomThreadPoolExecutor extends ThreadPoolExecutor { static class CustomTask<V> implements RunnableFuture<V> {...} protected <V> RunnableFuture<V> newTaskFor(Callable<V> c) { return new CustomTask<V>(c); } protected <V> RunnableFuture<V> newTaskFor(Runnable r, V v) { return new CustomTask<V>(r, v); } // ... add constructors, etc. }
Since:1.5
Constructor Summary
Constructor and Description |
---|
AbstractExecutorService() |
Method Summary
Modifier and Type | Method and Description |
---|---|
<T> List<Future<T>> | invokeAll(Collection<? extends Callable<T>> tasks) Executes the given tasks, returning a list of Futures holding their status and results when all complete. |
<T> List<Future<T>> | invokeAll(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit) Executes the given tasks, returning a list of Futures holding their status and results when all complete or the timeout expires, whichever happens first. |
<T> T | invokeAny(Collection<? extends Callable<T>> tasks) Executes the given tasks, returning the result of one that has completed successfully (i.e., without throwing an exception), if any do. |
<T> T | invokeAny(Collection<? extends Callable<T>> 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. |
protected <T> RunnableFuture<T> | newTaskFor(Callable<T> callable) Returns a RunnableFuture for the given callable task. |
protected <T> RunnableFuture<T> | newTaskFor(Runnable runnable, T value) Returns a RunnableFuture for the given runnable and default value. |
<T> Future<T> | submit(Callable<T> 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. |
<T> Future<T> | submit(Runnable task, T result) Submits a Runnable task for execution and returns a Future representing that task. |
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
newTaskFor
protected <T> RunnableFuture<T> newTaskFor(Runnable runnable, T value)
Returns a RunnableFuture for the given runnable and default 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:1.6
newTaskFor
protected <T> RunnableFuture<T> newTaskFor(Callable<T> callable)
Returns a RunnableFuture for the given callable task.
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:1.6
submit
public Future<?> submit(Runnable task)
Description copied from interface:
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:
submitin
interface
ExecutorService
Parameters:
task- the task to submit
Returns:a Future representing pending completion of the task
Throws:
RejectedExecutionException-
if the task cannot be scheduled for execution
NullPointerException-
if the task is null
submit
public <T> Future<T> submit(Runnable task, T result)
Description copied from interface:
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:
submitin
interface
ExecutorService
Parameters:
task- the task to submit
result- the result to return
Returns:a Future representing pending completion of the task
Throws:
RejectedExecutionException-
if the task cannot be scheduled for execution
NullPointerException-
if the task is null
submit
public <T> Future<T> submit(Callable<T> task)
Description copied from interface:
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
Executorsclass
includes a set of methods that can convert some other common closure-like objects, for example,
PrivilegedActionto
Callableform
so they can be submitted.
Specified by:
submitin
interface
ExecutorService
Parameters:
task- the task to submit
Returns:a Future representing pending completion of the task
Throws:
RejectedExecutionException-
if the task cannot be scheduled for execution
NullPointerException-
if the task is null
invokeAny
public <T> T invokeAny(Collection<? extends Callable<T>> tasks) throws InterruptedException, ExecutionException
Description copied from interface:
ExecutorService
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:
invokeAnyin
interface
ExecutorService
Parameters:
tasks- the collection of tasks
Returns:the result returned by one of the tasks
Throws:
InterruptedException-
if interrupted while waiting
ExecutionException-
if no task successfully completes
invokeAny
public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
Description copied from interface:
ExecutorService
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:
invokeAnyin
interface
ExecutorService
Parameters:
tasks- the collection of tasks
timeout- the maximum time to wait
unit- the time unit of the timeout argument
Returns:the result returned by one of the tasks.
Throws:
InterruptedException-
if interrupted while waiting
ExecutionException-
if no task successfully completes
TimeoutException-
if the given timeout elapses before any task successfully completes
invokeAll
public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks) throws InterruptedException
Description copied from interface:
ExecutorService
Executes the given tasks, returning a list of Futures holding their status and results when all complete.
Future.isDone()is true for
each element of the returned list. 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:
invokeAllin
interface
ExecutorService
Parameters:
tasks- the collection of tasks
Returns:A list of Futures representing the tasks, in the same sequential order as produced by the iterator for the given task list, each of which has completed.
Throws:
InterruptedException-
if interrupted while waiting, in which case unfinished tasks are cancelled.
invokeAll
public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit) throws InterruptedException
Description copied from interface:
ExecutorService
Executes the given tasks, returning a list of Futures holding their status and results when all complete or the timeout expires, whichever happens first.
Future.isDone()is true for
each element of the returned list. 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:
invokeAllin
interface
ExecutorService
Parameters:
tasks- the collection of tasks
timeout- the maximum time to wait
unit- the time unit of the timeout argument
Returns:a list of Futures representing the tasks, in the same sequential order as produced by the iterator for the given task list. If the operation did not time out, each task will have completed. If it did time out, some of these
tasks will not have completed.
Throws:
InterruptedException-
if interrupted while waiting, in which case unfinished tasks are cancelled
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