public class VirtualExecutorService extends AbstractExecutorService
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 = newVirtualExecutorService
(globalExecutor);ChannelFactory
factory = newNioServerSocketChannelFactory
(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();
ExecutorService
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
.
Constructor and Description |
---|
VirtualExecutorService(Executor parent)
Creates a new instance with the specified parent
Executor . |
Modifier and Type | Method and Description |
---|---|
boolean |
awaitTermination(long timeout,
TimeUnit unit) |
void |
execute(Runnable command) |
boolean |
isShutdown() |
boolean |
isTerminated() |
void |
shutdown() |
List<Runnable> |
shutdownNow() |
invokeAll, invokeAll, invokeAny, invokeAny, newTaskFor, newTaskFor, submit, submit, submit
public boolean isShutdown()
public boolean isTerminated()
public void shutdown()
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException
InterruptedException
public void execute(Runnable command)
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