Writing a Discard Server
2
DiscardServerHandler extends SimpleChannelHandler, which is an implementation
of ChannelHandler. SimpleChannelHandler provides various event handler methods that
you can override. For now, it is just enough to extend SimpleChannelHandler rather than to
implement the handler interfaces by yourself.
We override the messageReceived event handler method here. This method is called with a
MessageEvent, which contains the received data, whenever new data is received from a client. In
this example, we ignore the received data by doing nothing to implement the DISCARD protocol.
exceptionCaught event handler method is called with an ExceptionEvent when an exception
was raised by Netty due to I/O error or by a handler implementation due to the exception thrown while
processing events. In most cases, the caught exception should be logged and its associated channel
should be closed here, although the implementation of this method can be different depending on what
you want to do to deal with an exceptional situation. For example, you might want to send a response
message with an error code before closing the connection.
So far so good. We have implemented the first half of the DISCARD server. What's left now is to write the
main method which starts the server with the DiscardServerHandler.
package org.jboss.netty.example.discard;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;
public class DiscardServer {
public static void main(String[] args) throws Exception {
ChannelFactory factory =
new NioServerSocketChannelFactory (
Executors.newCachedThreadPool(),
Executors.newCachedThreadPool());
ServerBootstrap bootstrap = new ServerBootstrap (factory);
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() {
return Channels.pipeline(new DiscardServerHandler());
}
});
bootstrap.setOption("child.tcpNoDelay", true);
bootstrap.setOption("child.keepAlive", true);
bootstrap.bind(new InetSocketAddress(8080));
}
}
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