java.lang.Object | |
↳ | java.util.concurrent.AbstractExecutorService |
Known Direct Subclasses |
Known Indirect Subclasses |
Provides default implementations of ExecutorService
execution methods. This class implements the submit
,
invokeAny
and invokeAll
methods using a
RunnableFuture
returned by newTaskFor
, which defaults
to the FutureTask
class 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 ThreadPoolExecutor
to use
a CustomTask
class instead of the default FutureTask
:
public class CustomThreadPoolExecutor extends ThreadPoolExecutor { static class CustomTask
protectedimplements RunnableFuture {... RunnableFuture newTaskFor(Callable c) { return new CustomTask (c); } protected RunnableFuture newTaskFor(Runnable r, V v) { return new CustomTask (r, v); } // ... add constructors, etc. }}
Public Constructors | |||||||||||
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Public Methods | |||||||||||
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Executes the given tasks, returning a list of Futures holding
their status and results when all complete.
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Executes the given tasks, returning a list of Futures holding
their status and results
when all complete or the timeout expires, whichever happens first.
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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.
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Executes the given tasks, returning the result
of one that has completed successfully (i.e., without throwing
an exception), if any do.
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Submits a Runnable task for execution and returns a Future
representing that task.
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Submits a value-returning task for execution and returns a
Future representing the pending results of the task.
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Submits a Runnable task for execution and returns a Future
representing that task.
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Protected Methods | |||||||||||
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Returns a
RunnableFuture for the given callable task. | |||||||||||
Returns a
RunnableFuture for the given runnable and default
value. |
[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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From interface
java.util.concurrent.Executor
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From interface
java.util.concurrent.ExecutorService
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Executes the given tasks, returning a list of Futures holding
their status and results when all complete.
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.
tasks | the collection of tasks |
---|
InterruptedException |
---|
Executes the given tasks, returning a list of Futures holding
their status and results
when all complete or the timeout expires, whichever happens first.
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.
tasks | the collection of tasks |
---|---|
timeout | the maximum time to wait |
unit | the time unit of the timeout argument |
InterruptedException |
---|
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.
tasks | the collection of tasks |
---|---|
timeout | the maximum time to wait |
unit | the time unit of the timeout argument |
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.
tasks | the collection of tasks |
---|
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.
task | the task to submit |
---|---|
result | the result to return |
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.
task | the task to submit |
---|
Submits a Runnable task for execution and returns a Future
representing that task. The Future's get
method will
return null
upon successful completion.
task | the task to submit |
---|
Returns a RunnableFuture
for the given callable task.
callable | the callable task being wrapped |
---|
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 taskReturns a RunnableFuture
for the given runnable and default
value.
runnable | the runnable task being wrapped |
---|---|
value | the default value for the returned future |
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