org.jboss.netty.channel.socket.oio

Class OioClientSocketChannelFactory

java.lang.Object

org.jboss.netty.channel.socket.oio.OioClientSocketChannelFactory

All Implemented Interfaces:

ChannelFactory, ClientSocketChannelFactory, ExternalResourceReleasable

public class OioClientSocketChannelFactory
extends Object
implements ClientSocketChannelFactory

A ClientSocketChannelFactory which creates a client-side blocking I/O based SocketChannel. It utilizes the good old blocking I/O API which is known to yield better throughput and latency when there are relatively small number of connections to serve.

How threads work

There is only one type of threads in OioClientSocketChannelFactory; worker threads.

Worker threads

Each connected Channel has a dedicated worker thread, just like a traditional blocking I/O thread model.

Life cycle of threads and graceful shutdown

Worker threads are acquired from the Executor which was specified when a OioClientSocketChannelFactory was created (i.e. workerExecutor.) Therefore, you should make sure the specified Executor is able to lend the sufficient number of threads.

Worker threads are acquired lazily, and then released when there's nothing left to process. All the related resources are also released when the worker threads are released. Therefore, to shut down a service gracefully, you should do the following:

1. close all channels created by the factory usually using ChannelGroup.close(), and
2. call releaseExternalResources().

Please make sure not to shut down the executor until all channels are closed. Otherwise, you will end up with a RejectedExecutionException and the related resources might not be released properly.

Limitation

A SocketChannel created by this factory does not support asynchronous operations. Any I/O requests such as "connect" and "write" will be performed in a blocking manner.

Constructor Summary

Constructors

Constructor and Description
OioClientSocketChannelFactory() Creates a new instance with a Executors.newCachedThreadPool() as worker executor.
OioClientSocketChannelFactory(Executor workerExecutor) Creates a new instance.

Method Summary

Methods

Modifier and Type	Method and Description
SocketChannel	newChannel(ChannelPipeline pipeline) Creates and opens a new Channel and attaches the specified ChannelPipeline to the new Channel.
void	releaseExternalResources() Releases the external resources that this factory depends on to function.

Methods inherited from class java.lang.Object

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

Constructor Detail

OioClientSocketChannelFactory

public OioClientSocketChannelFactory()

Creates a new instance with a Executors.newCachedThreadPool() as worker executor. See OioClientSocketChannelFactory(Executor)

OioClientSocketChannelFactory

public OioClientSocketChannelFactory(Executor workerExecutor)

Creates a new instance.

Parameters:

workerExecutor - the Executor which will execute the I/O worker threads

Method Detail

newChannel

public SocketChannel newChannel(ChannelPipeline pipeline)

Description copied from interface: ChannelFactory

Creates and opens a new Channel and attaches the specified ChannelPipeline to the new Channel.

Specified by:

newChannel in interface ChannelFactory

Specified by:

newChannel in interface ClientSocketChannelFactory

Parameters:

pipeline - the ChannelPipeline which is going to be attached to the new Channel

Returns:

the newly open channel

releaseExternalResources

public void releaseExternalResources()

Description copied from interface: ChannelFactory

Releases the external resources that this factory depends on to function. An external resource is a resource that this factory didn't create by itself. For example, Executors that you specified in the factory constructor are external resources. You can call this method to release all external resources conveniently when the resources are not used by this factory or any other part of your application. An unexpected behavior will be resulted in if the resources are released when there's an open channel which is managed by this factory.

Specified by:

releaseExternalResources in interface ChannelFactory

Specified by:

releaseExternalResources in interface ExternalResourceReleasable