/*
* Copyright 2004-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.cindy.example.chat;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import net.sf.cindy.Session;
import net.sf.cindy.SessionHandlerAdapter;
/**
* Chat handler.
*
* @author <a href="chenrui@gmail.com">Roger Chen</a>
* @version $id$
*/
public class ChatHandler extends SessionHandlerAdapter {
private static final Set sessions = Collections
.synchronizedSet(new HashSet());
private static final Object USER_ID_ATTR = "userId";
private static int counter = 0; // should use AtomicInteger instead
public void sessionStarted(Session session) throws Exception {
sessions.add(session);
int id = ++counter;
session.setAttribute(USER_ID_ATTR, new Integer(id));
// send to current user
session.send("Welcome, User " + id + "!");
// send to other user
send(session, "User " + id + " log in");
}
public void sessionTimeout(Session session) throws Exception {
session.close();
}
public void sessionClosed(Session session) throws Exception {
sessions.remove(session);
send(session, "User " + session.getAttribute(USER_ID_ATTR) + " log out");
}
public void objectReceived(Session session, Object obj) throws Exception {
String senderId = session.getAttribute(USER_ID_ATTR).toString();
String msg = (String) obj;
send(session, "User " + senderId + " say: " + msg);
}
private void send(Session srcSession, String message) {
// send message to other user
synchronized (sessions) {
for (Iterator iter = sessions.iterator(); iter.hasNext();) {
Session session = (Session) iter.next();
if (session != srcSession) {
session.send(message);
}
}
}
}
}