private void register() {
   if (session != null && session.isConnected()) {
     onlineUsers.clear();
     // get the current list
     Message msg = session.sendMessage("", "list", "");
     System.out.println("LIST: " + msg.getBody());
     StringTokenizer st = new StringTokenizer(msg.getBody(), "\n");
     while (st.hasMoreTokens()) {
       onlineUsers.addElement(new HostItem(st.nextToken()));
     }
     session.postMessage("", "register", "");
   }
 }
 public void receiveMsg(Message msg) {
   // System.out.println(msg.getSubject() + " : " + msg.getBody());
   String subject = msg.getSubject();
   if (subject != null) {
     if (subject.equals("online")) {
       onlineUsers.addElement(new HostItem(msg.getBody()));
       displayMessage(msg.getBody() + " : Online", onlineClientAttrSet);
     } else if (subject.equals("offline")) {
       onlineUsers.removeElement(new HostItem(msg.getBody()));
       displayMessage(msg.getBody() + " : Offline", offlineClientAttrSet);
     } else if (subject.equals("eavesdrop enabled")) {
       Object[] values = jListOnlineUsers.getSelectedValues();
       if (values == null) return;
       for (int i = 0; i < values.length; i++) {
         ((HostItem) values[i]).eavesDroppingEnabled = true;
       }
       jListOnlineUsers.updateUI();
     } else if (subject.equals("eavesdrop disabled")) {
       Object[] values = jListOnlineUsers.getSelectedValues();
       if (values == null) return;
       for (int i = 0; i < values.length; i++) {
         ((HostItem) values[i]).eavesDroppingEnabled = false;
       }
       jListOnlineUsers.updateUI();
     } else if (subject.equals("globaleavesdrop enabled")) {
       displayMessage("Global Eavesdropping Enabled", onlineClientAttrSet);
     } else if (subject.equals("globaleavesdrop disabled")) {
       displayMessage("Global Eavesdropping Disabled", offlineClientAttrSet);
     } else {
       String to = msg.getTo();
       String from = msg.getFrom() == null ? "server" : msg.getFrom();
       String body = msg.getBody() != null ? msg.getBody() : "";
       if (jTextFieldUser.getText().equals(to)) { // this message is sent to us
         displayMessage(subject, from, body, incomingMsgAttrSet);
       } else { // this is an eavesdrop message
         displayMessage(subject, to, from, body, eavesdropAttrSet);
       }
     }
   } else {
     subject = "";
     String to = msg.getTo();
     String from = msg.getFrom() == null ? "server" : msg.getFrom();
     String body = msg.getBody() != null ? msg.getBody() : "";
     if (jTextFieldUser.getText().equals(to)) { // this message is sent to us
       displayMessage(subject, from, body, incomingMsgAttrSet);
     } else { // this is an eavesdrop message
       displayMessage(subject, to, from, body, eavesdropAttrSet);
     }
   }
 }
  public static void main(String[] args) {
    if (args.length > 0) {
      try {
        if (args[0].equals("-stress")) {
          String userName = args[1];
          String server = args[2];
          String targetUser = args[3];
          int rate = Integer.parseInt(args[4]);
          Session session = new Session();
          if (session.connect(server, userName)) {
            long msgCount = 0;
            while (true) {
              for (int i = 0; i < rate; i++) {
                msgCount++;
                session.postMessage(
                    targetUser, ("subject " + String.valueOf(msgCount)), Util.randomString(1000));
              }
              Thread.currentThread().sleep(2000);
            }
          }
        } else if (args[0].equals("-stress2")) {
          String userName = args[1];
          String server = args[2];
          String targetUser = args[3];
          int rate = Integer.parseInt(args[4]);
          Session session = new Session();
          long msgCount = 0;
          while (true) {
            if (session.connect(server, userName)) {
              for (int i = 0; i < rate; i++) {
                msgCount++;
                session.postMessage(
                    targetUser, ("subject " + String.valueOf(msgCount)), Util.randomString(1000));
              }
              session.disconnect();
            }
            Thread.currentThread().sleep(2000);
          }

        } else if (args[0].equals("-stress3")) {
          String userName = args[1];
          String server = args[2];
          String targetUser = args[3];
          int rate = Integer.parseInt(args[4]);
          Session session = new Session();
          long msgCount = 0;
          while (true) {
            if (session.connect(server, userName)) {
              for (int i = 0; i < rate; i++) {
                msgCount++;
                session.postMessage(
                    targetUser, ("subject " + String.valueOf(msgCount)), Util.randomString(1000));
              }
              session.dropConnection();
            }
            Thread.currentThread().sleep(2000);
          }
        } else if (args[0].equals("-stress4")) {
          String userName = args[1];
          String server = args[2];
          String targetUser = args[3];
          int rate = Integer.parseInt(args[4]);
          Session session = new Session();
          long msgCount = 0;
          while (true) {
            if (session.connect(server, userName)) {
              for (int i = 0; i < rate; i++) {
                msgCount++;
                session.postMessage(
                    targetUser, ("subject " + String.valueOf(msgCount)), Util.fixedString(300000));
              }
              session.dropConnection();
            }
            Thread.currentThread().sleep(5000);
          }

        } else if (args[0].equals("-stress5")) {
          String userName = args[1];
          String server = args[2];
          String targetUser = args[3];
          int rate = Integer.parseInt(args[4]);
          Session session = new Session();
          if (session.connect(server, userName)) {
            long msgCount = 0;
            while (true) {
              for (int i = 0; i < rate; i++) {
                msgCount++;
                session.postMessage(
                    targetUser, ("subject " + String.valueOf(msgCount)), Util.randomString(10));
              }
              Thread.currentThread().sleep(2000);
            }
          }
        } else if (args[0].equals("-monitor")) {
          String userName = args[1];
          String server = args[2];
          long interval = Long.parseLong(args[3]);
          Session session = new Session();
          long msgCount = 0;
          if (session.connect(server, userName)) {
            while (true) {
              Message msg = session.sendMessage("", "get send queue stats", "");
              System.out.println("SEND QUEUE STATS");
              System.out.println(msg.getBody());
              Thread.currentThread().sleep(interval);
            }
          }
        } else if (args[0].equals("-responder")) {
          String userName = args[1];
          String server = args[2];
          long interval = Long.parseLong(args[3]);
          final Session session = new Session();
          if (session.connect(server, userName)) {
            session.addListener(
                new AsyncMessageReceiverListener() {
                  public void receiveMsg(Message msg) {
                    session.postMessage(
                        msg.getFrom(), "RE: " + msg.getFrom(), msg.getThread(), msg.getBody());
                  }

                  public void messageReceiverClosed(MessageReceiver mr) {}
                });
            while (true) {
              Thread.currentThread().sleep(interval);
            }
          }
        } else if (args[0].equals("-threaded-sender")) {
          String userName = args[1];
          String server = args[2];
          String targetUser = args[3];
          int rate = Integer.parseInt(args[4]);
          Session session = new Session();
          long msgCount = 0;
          if (session.connect(server, userName)) {
            while (true) {
              for (int i = 0; i < rate; i++) {
                msgCount++;
                Message reply =
                    session.sendMessage(
                        targetUser, ("subject " + String.valueOf(msgCount)), "body", 10000);
                if (reply == null) {
                  System.out.println("reply not received");
                }
              }
              Thread.currentThread().sleep(5000);
            }
          }
        }
      } catch (Exception e) {
        System.out.println(
            "Unable to start stress test.  Format: -stress <user name> <server> <target user> <msg rate>");
      }
    } else {
      Client client = new Client();
      client.setSize(800, 420);
      center(client);
      client.show();
    }
  }