EchoServer.java

// This file contains material supporting section 3.7 of the textbook:
// "Object Oriented Software Engineering" and is issued under the open-source
// license found at www.lloseng.com 

import java.io.*;
import ocsf.server.*;

/**
 * This class overrides some of the methods in the abstract 
 * superclass in order to give more functionality to the server.
 *
 * @author Dr Timothy C. Lethbridge
 * @author Dr Robert Laganière
 * @author François Bélanger
 * @author Paul Holden
 * @version July 2000
 */
public class EchoServer extends AbstractServer 
{
	ServerConsole servCon;
	boolean alreadyLoggedIn = false;
  //Class variables *************************************************
  
  /**
   * The default port to listen on.
   */
  final public static int DEFAULT_PORT = 5555;
  //Constructors ****************************************************
  
  /**
   * Constructs an instance of the echo server.
   *
   * @param port The port number to connect on.
   */
  public EchoServer(int port) 
  {
    super(port);
  }

  
  //Instance methods ************************************************
  
  /**
   * This method handles any messages received from the client.
   *
   * @param msg The message received from the client.
   * @param client The connection from which the message originated.
   */
  public void handleMessageFromClient(Object msg, ConnectionToClient client){
	  String[] message = msg.toString().split(" ");
	  if(alreadyLoggedIn == true && message[0].equals("#login")){
		  System.out.println("You have already logged in!");
	  }
	  
	  if(message[0].equals("#login")) {
		client.setInfo("loginId", message[1]);
		alreadyLoggedIn = true;
		return;
	  }
	  
    System.out.println("Message received: " + msg + " from " + client.getInfo("loginId") + " : " + client + " ");
    this.sendToAllClients(client.getInfo("loginId") + " : " + msg);
  }
  
  // méthode qui prend le message de la console d'un serveur
  public void handleMessageFromServerUI(String message, ServerConsole serverCon)
  {
	serverCon.display(message);
  	super.sendToAllClients(message);
  }

    
  /**
   * This method overrides the one in the superclass.  Called
   * when the server starts listening for connections.
   */
  protected void serverStarted()
  {
    System.out.println("Server listening for connections on port " + getPort());
  }
  
  /**
   * This method overrides the one in the superclass.  Called
   * when the server stops listening for connections.
   */
  protected void serverStopped()
  {
    System.out.println("Server has stopped listening for connections.");
  }
  
  
  /* 
	  trois méthodes suivantes sont nécéssaires pour afficher
	  un message sur le EchoServer console qu'un client s'est
	  déconnecté ou connecté 
  */
  protected void clientConnected(ConnectionToClient client){
	  System.out.println("Client has connected");
  }
  
  synchronized protected void clientDisconnected(ConnectionToClient client){
	  System.out.println("Client has disconnected");
  }
  
  synchronized protected void clientException(ConnectionToClient client, 
		  									  Throwable exception) {
	  clientDisconnected(client);
  }
  
  public void quit(){
	    try{ close(); }
	    catch(IOException e) {}
	    System.exit(0);
  }
  
  //Class methods ***************************************************
  /**
   * This method is responsible for the creation of 
   * the server instance (there is no UI in this phase).
   *
   * @param args[0] The port number to listen on.  Defaults to 5555 
   *          if no argument is entered.
   */
  public static void main(String[] args) 
  {  
    int port = 0; //Port to listen on

    try
    {
      port = Integer.parseInt(args[0]); //Get port from command line
    }
    catch(Throwable t)
    {
      port = DEFAULT_PORT; //Set port to 5555
    }
	
    EchoServer sv = new EchoServer(port);
    ServerConsole serverCon = new ServerConsole(port);
    
    try
    {
 		serverCon.accept();
    } 
    catch (Exception ex)
    {
      System.out.println("ERROR - Could not listen for clients!");
    }

    
  }
}
//End of EchoServer class