- java.lang.Object
-
- java.util.concurrent.AbstractExecutorService
-
- All Implemented Interfaces:
Executor,ExecutorService
- Direct Known Subclasses:
ForkJoinPool,ThreadPoolExecutor
public abstract class AbstractExecutorService extends Object implements ExecutorService
Provides default implementations ofExecutorServiceexecution methods. This class implements thesubmit,invokeAnyandinvokeAllmethods using aRunnableFuturereturned bynewTaskFor, which defaults to theFutureTaskclass provided in this package. For example, the implementation ofsubmit(Runnable)creates an associatedRunnableFuturethat is executed and returned. Subclasses may override thenewTaskFormethods to returnRunnableFutureimplementations other thanFutureTask.Extension example. Here is a sketch of a class that customizes
ThreadPoolExecutorto use aCustomTaskclass instead of the defaultFutureTask: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
Constructors Constructor Description AbstractExecutorService()
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected <T> RunnableFuture<T>newTaskFor(Runnable runnable, T value)Returns aRunnableFuturefor the given runnable and default value.protected <T> RunnableFuture<T>newTaskFor(Callable<T> callable)Returns aRunnableFuturefor the given callable 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.<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.-
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
-
Methods declared in interface java.util.concurrent.ExecutorService
awaitTermination, invokeAll, invokeAll, invokeAny, invokeAny, isShutdown, isTerminated, shutdown, shutdownNow
-
-
-
-
Method Detail
-
newTaskFor
protected <T> RunnableFuture<T> newTaskFor(Runnable runnable, T value)
Returns aRunnableFuturefor the given runnable and default value.- Type Parameters:
T- the type of the given value- Parameters:
runnable- the runnable task being wrappedvalue- the default value for the returned future- Returns:
- a
RunnableFuturewhich, when run, will run the underlying runnable and which, as aFuture, 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 aRunnableFuturefor the given callable task.- Type Parameters:
T- the type of the callable's result- Parameters:
callable- the callable task being wrapped- Returns:
- a
RunnableFuturewhich, when run, will call the underlying callable and which, as aFuture, 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:ExecutorServiceSubmits a Runnable task for execution and returns a Future representing that task. The Future'sgetmethod will returnnullupon successful completion.- Specified by:
submitin interfaceExecutorService- Parameters:
task- the task to submit- Returns:
- a Future representing pending completion of the task
- Throws:
RejectedExecutionException- if the task cannot be scheduled for executionNullPointerException- if the task is null
-
submit
public <T> Future<T> submit(Runnable task, T result)
Description copied from interface:ExecutorServiceSubmits a Runnable task for execution and returns a Future representing that task. The Future'sgetmethod will return the given result upon successful completion.- Specified by:
submitin interfaceExecutorService- Type Parameters:
T- the type of the result- Parameters:
task- the task to submitresult- the result to return- Returns:
- a Future representing pending completion of the task
- Throws:
RejectedExecutionException- if the task cannot be scheduled for executionNullPointerException- if the task is null
-
submit
public <T> Future<T> submit(Callable<T> task)
Description copied from interface:ExecutorServiceSubmits a value-returning task for execution and returns a Future representing the pending results of the task. The Future'sgetmethod 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,PrivilegedActiontoCallableform so they can be submitted.- Specified by:
submitin interfaceExecutorService- 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
- Throws:
RejectedExecutionException- if the task cannot be scheduled for executionNullPointerException- if the task is null
-
-