/*
* JORAM: Java(TM) Open Reliable Asynchronous Messaging
* Copyright (C) 2001 - 2010 ScalAgent Distributed Technologies
* Copyright (C) 1996 - 2000 Dyade
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA.
*
* Initial developer(s): Jose Carlos Waeny
* Contributor(s): ScalAgent Distributed Technologies
*/
package chat;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import javax.naming.InitialContext;
/**
* Launching Simple Chat:
* connecting to JORAM server, creating chat agents, creating topic
*
* @author JC Waeny
* @email jc@waeny.2y.net
* @version 1.0
*/
public class SimpleChat implements javax.jms.MessageListener {
private ConnectionFactory conFactory;
private Session pubSession;
private Session subSession;
private MessageProducer publisher;
private MessageConsumer subscriber;
private Connection connection;
private String userName;
/* Constructor. Establish JMS publisher and subscriber */
public SimpleChat(String topicName, String username) throws Exception {
InitialContext jndi = null;
jndi = new InitialContext();
// Look up a JMS connection factory
conFactory = (ConnectionFactory)jndi.lookup("factoryChat");
// Look up a JMS topic
Topic chatTopic = (Topic)jndi.lookup(topicName);
// Create a JMS connection
connection = conFactory.createConnection();
// Create two JMS session objects
pubSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
subSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Create a JMS publisher and subscriber
publisher = pubSession.createProducer(chatTopic);
subscriber = subSession.createConsumer(chatTopic);
// Set a JMS message listener
subscriber.setMessageListener(this);
// Start the JMS connection; allows messages to be delivered
userName = username;
connection.start( );
}
/* Receive message from topic subscriber */
public void onMessage(Message message) {
try {
TextMessage textMessage = (TextMessage) message;
String text = textMessage.getText( );
System.out.println(textMessage.getStringProperty("User") + ": " + text);
} catch (JMSException jmse) {
jmse.printStackTrace( );
}
}
/* Create and send message using topic publisher */
protected void writeMessage(String text) throws JMSException {
TextMessage message = pubSession.createTextMessage( );
message.setText(text);
message.setStringProperty("User", userName);
publisher.send(message);
}
/* Close the JMS connection */
public void close( ) throws JMSException {
connection.close( );
}
/* Run the Chat client */
public static void main(String [] args){
SimpleChat chat = null;
String user = null;
try {
user = args[0];
} catch(Exception e) {
user = "NoName";
}
try {
chat = new SimpleChat("topicChat", user);
// Read from command line
BufferedReader commandLine = new BufferedReader(new InputStreamReader(System.in));
// Loop until the word "exit" is typed
System.out.println("User: " + user + " connected !");
System.out.println("Type your phrases and press 'ENTER' ...");
System.out.println("Type 'exit' or 'quit' to abandon the chat.");
while(true) {
String s = commandLine.readLine( );
if ( s.equalsIgnoreCase("exit") || s.equalsIgnoreCase("quit") ) {
chat.close( ); // close down connection
System.exit(0);// exit program
} else
chat.writeMessage(s);
}
} catch(Exception e) {
System.out.println( e.toString());
}
}
}