public void initialize() throws IOException {
 
	// Create an Acceptor
	NioDatagramAcceptor acceptor = new NioDatagramAcceptor();
 
	// Add Handler
	acceptor.setHandler(new ServerHandler());
 
	acceptor.getFilterChain().addLast("logging",
				new LoggingFilter());
	acceptor.getFilterChain().addLast("codec",
				new ProtocolCodecFilter(new SNMPCodecFactory()));
 
	// Create Session Configuration
	DatagramSessionConfig dcfg = acceptor.getSessionConfig();
        dcfg.setReuseAddress(true);
        logger.debug("Starting Server......");
        // Bind and be ready to listen
        acceptor.bind(new InetSocketAddress(DEFAULT_PORT));
        logger.debug("Server listening on "+DEFAULT_PORT);
}

NOTE: The latest MINA releases doesn’t have the package specific to Spring, like its earlier versions. The package is now named Integration Beans, to make the implementation work for all DI frameworks.

Lets see the Spring xml file. Please see that I have removed generic part from xml and have put only the specific things needed to pull up the implementation. This example has been derived from Chat example shipped with MINA release.

Now lets pull things together

1. Lets set the IO Handler


2. Lets create the Filter chain



Here, we create instance of our IoFilter. See that for the ProtocolCodec factory, we have used Constructor injection. Logging Filter creation is straight forward. Once we have defined the beans for the filters to be used, we now create the Filter Chain to be used for the implementation. We define a bean with id “FilterChainBuidler” and add the defined filters to it. We are almost ready, and we just need to create the Socket and call bind

3. Lets complete the last part of creating the Socket and completing the chain

Now we create our ioAcceptor, set IO handler and Filter Chain. Now we have to write a function to read this file using Spring and start our application. Here’s the code

public void initializeViaSpring() throws Exception {
	new ClassPathXmlApplicationContext("trapReceiverContext.xml");
}

We just call this method from main, and this shall initialize our MINA application. Will try to write a post using some other DI framework like Google Guice.

Reference:

• Chat Server