question about simple MINA client and server - apache-mina

Question

I am just trying to create a simple MINA server and client to evaluate. Here is my code.
public class Server {
private static final int PORT = 8080;
static class ServerHandler extends IoHandlerAdapter {
#Override
public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
cause.printStackTrace();
}
#Override
public void sessionCreated(IoSession session) {
System.out.println("session is created");
session.write("Thank you");
}
#Override
public void sessionClosed(IoSession session) throws Exception {
System.out.println("session is closed.");
}
#Override
public void messageReceived(IoSession session, Object message) {
System.out.println("message=" + message);
session.write("Reply="+message);
}
}
/**
* #param args
*/
public static void main(String[] args) throws Exception {
SocketAcceptor acceptor = new NioSocketAcceptor();
acceptor.getFilterChain().addLast( "logger", new LoggingFilter() );
acceptor.getFilterChain().addLast( "codec", new ProtocolCodecFilter( new TextLineCodecFactory( Charset.forName( "UTF-8" ))));
acceptor.setHandler(new Server.ServerHandler());
acceptor.getSessionConfig().setReadBufferSize( 2048 );
acceptor.getSessionConfig().setIdleTime( IdleStatus.BOTH_IDLE, 10 );
acceptor.bind(new InetSocketAddress(PORT));
System.out.println("Listening on port " + PORT);
for (;;) {
Thread.sleep(3000);
}
}
}
public class Client {
private static final int PORT = 8080;
private IoSession session;
private ClientHandler handler;
public Client() {
super();
}
public void initialize() throws Exception {
handler = new ClientHandler();
NioSocketConnector connector = new NioSocketConnector();
connector.getFilterChain().addLast( "codec", new ProtocolCodecFilter( new TextLineCodecFactory( Charset.forName( "UTF-8" ))));
connector.getFilterChain().addLast("logger", new LoggingFilter());
connector.setHandler(handler);
for (;;) {
try {
ConnectFuture future = connector.connect(new InetSocketAddress(PORT));
future.awaitUninterruptibly();
session = future.getSession();
break;
} catch (RuntimeIoException e) {
System.err.println("Failed to connect.");
e.printStackTrace();
Thread.sleep(5000);
}
}
if (session == null) {
throw new Exception("Unable to get session");
}
Sender sender = new Sender();
sender.start();
session.getCloseFuture().awaitUninterruptibly();
connector.dispose();
System.out.println("client is done.");
}
/**
* #param args
*/
public static void main(String[] args) throws Exception {
Client client = new Client();
client.initialize();
}
class Sender extends Thread {
#Override
public void run() {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
handler.messageSent(session, "message");
}
}
class ClientHandler extends IoHandlerAdapter {
#Override
public void sessionOpened(IoSession session) {
}
#Override
public void messageSent(IoSession session, Object message) {
System.out.println("message sending=" + message);
session.write(message);
}
#Override
public void messageReceived(IoSession session, Object message) {
System.out.println("message receiving "+ message);
}
#Override
public void exceptionCaught(IoSession session, Throwable cause) {
cause.printStackTrace();
}
}
}
When I execute this code, the Client seems to keep sending a message instead of stopping after it sends. It looks to me that there is a recursive call in underlying MINA code. I know that I am doing something wrong.
Can somebody tell me how to fix this?
Thanks.

Answer 1

Try to initialize and start your sender and use the session within sessionOpened (ClientHandler)