org.jboss.netty.util

类 VirtualExecutorService

java.lang.Object

java.util.concurrent.AbstractExecutorService

org.jboss.netty.util.VirtualExecutorService

所有已实现的接口:

java.util.concurrent.Executor, java.util.concurrent.ExecutorService

public class VirtualExecutorService
extends java.util.concurrent.AbstractExecutorService

A delegating ExecutorService with its own termination management.

VirtualExecutorService is used when you want to inject an ExecutorService but you do not want to allow the explicit termination of threads on shutdown request. It is particularly useful when the ExecutorService to inject is shared by different components and the life cycle of the components depend on the termination of the injected ExecutorService.

 ExecutorService globalExecutor = ...;
 ExecutorService virtualExecutor = new VirtualExecutorService(globalExecutor);

 ChannelFactory factory =
         new NioServerSocketChannelFactory(virtualExecutor, virtualExecutor);
 ...

 // ChannelFactory.releaseExternalResources() shuts down the executor and
 // interrupts the I/O threads to terminate all I/O tasks and to release all
 // resources acquired by ChannelFactory.
 factory.releaseExternalResources();

 // Note that globalExecutor is not shut down because VirtualExecutorService
 // implements its own termination management. All threads which were acquired
 // by ChannelFactory via VirtualExecutorService are returned to the pool.
 assert !globalExecutor.isShutdown();
 

The differences from an ordinary ExecutorService

A shutdown request (shutdown() or shutdownNow()) does not shut down its parent Executor but simply sets its internal flag to reject further execution request.

shutdownNow() interrupts only the thread which is executing the task executed via VirtualExecutorService.

awaitTermination(long, TimeUnit) does not wait for real thread termination but wait until VirtualExecutorService is shut down and its active tasks are finished and the threads are returned to the parent Executor.

构造器概要

构造器

构造器和说明
VirtualExecutorService(java.util.concurrent.Executor parent) Creates a new instance with the specified parent Executor.

方法概要

方法

限定符和类型	方法和说明
boolean	awaitTermination(long timeout, java.util.concurrent.TimeUnit unit)
void	execute(java.lang.Runnable command)
boolean	isShutdown()
boolean	isTerminated()
void	shutdown()
java.util.List<java.lang.Runnable>	shutdownNow()

从类继承的方法 java.util.concurrent.AbstractExecutorService

invokeAll, invokeAll, invokeAny, invokeAny, newTaskFor, newTaskFor, submit, submit, submit

从类继承的方法 java.lang.Object

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

构造器详细资料

VirtualExecutorService

public VirtualExecutorService(java.util.concurrent.Executor parent)

Creates a new instance with the specified parent Executor.

方法详细资料

isShutdown

public boolean isShutdown()

isTerminated

public boolean isTerminated()

shutdown

public void shutdown()

shutdownNow

public java.util.List<java.lang.Runnable> shutdownNow()

awaitTermination

public boolean awaitTermination(long timeout,
                       java.util.concurrent.TimeUnit unit)
                         throws java.lang.InterruptedException

抛出:

java.lang.InterruptedException

execute

public void execute(java.lang.Runnable command)