coder-client/src/com/coder/client/CoderClient.java

package com.coder.client;

import java.util.logging.Level;
import java.util.logging.Logger;

import javax.swing.JOptionPane;

import com.coder.client.LoginDialog.LoginDialogAction;
import com.coder.server.CoderServer;

import zutil.log.LogUtil;

public class CoderClient extends Thread{
	public static final Logger logger = LogUtil.getLogger();
	
	private String url;
	private int port;
	private Session session;
	private ClientWindow window;
	private LoginDialog loginDialog;
	
	public CoderClient(String url, int port) {
		this.url = url;
		this.port = port;
		
		this.window = new ClientWindow("CoderClient");
		
		
		super.start();
	}
	
	public void run(){
		//save the previously typed user name
		String username = "";
		while(true){
			//close previou session if applicable
			closeCurrentSession();
			
			//setup a new session
			this.session = Session.setupConnection(url, port);
			if(session == null){
				logger.info("Could not setup a connection to " + url + ":" + port);
				continue;
			}
			
			//ask for username and passwor din a dialog window
			LoginDialog loginDialog = new LoginDialog(username, null);
			loginDialog.setVisible(true);	//blocking
			loginDialog.dispose();
			if(loginDialog.getAction() == LoginDialogAction.CANCEL){
				logger.info("Login dialog closed or canceled by the user. terminating.");
				break;
			}
			
			//authenticate the user
			username = loginDialog.getUsername();
			String password = new String(loginDialog.getPassword());
			boolean authenticated = session.authenticate(username, password);
			if(!authenticated){
				JOptionPane.showMessageDialog(null, "Wrong username or password", "Authentication Failed", JOptionPane.INFORMATION_MESSAGE);
				System.out.println("Authentication failed");
				continue;
			}
			
			//start receiving traffic from the server
			session.start();
			
			//show the user the main GUI
			this.window.setVisible(true);
			try {Thread.sleep(1000);} catch (InterruptedException e) {}
			
			//wait here until the session is closed for some reason
			while(session.isConnected()){
				Thread.yield();
			}
			
			//hide the main GUI
			logger.info("The socket was closed. terminating.");
			this.window.setVisible(false);
			Thread.yield();
		}
		closeCurrentSession();
		this.window.dispose();
		System.exit(0);
	}
	
	private void closeCurrentSession(){
		if(this.session != null){
			session.close();
			session = null;
		}
	}
	
	public static void main(String[] args){
		int port = CoderServer.SERVER_PORT;
		new CoderClient("127.0.0.1", port);
	}

}