MessageReceiver.java

/*
 * MessageReceiver.java
 *
 * Version 1.0  Sep 14, 2008
 *
 * Copyright notice
 *
 * Brief description
 *
 * (c) 2008 by dbreuer
 */
package de.fhkoeln.cosima.messaging;

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.TextMessage;

/**
 * Implementation of message receiving functionality based on the
 * {@link MessageFeatures} class and by implementing the {@link MessageListener}
 * interface.
 * 
 * @author Dirk Breuer
 * @version 1.0 Sep 14, 2008
 */
public class MessageReceiver extends MessageFeatures implements MessageListener {

  public MessageReceiver(String topicName) {
    super(topicName);
  }

  /*
   * (non-Javadoc)
   * @see de.fhkoeln.cosima.messaging.MessageFeatures#executeFeature()
   */
  protected void executeFeature() {

    try {
      // create a MessageConsumer from the Session
      MessageConsumer consumer = getSession().createConsumer(getDestination());
      System.out.println("> Receiving messages from destination '"
          + getDestination() + "' ...");
      // consumer.setMessageListener(this);
      Message message = consumer.receive();
      onMessage(message);
      consumer.close();
    } catch (JMSException e) {
      System.err.println("JMS Error occured while receiving a message.");
      e.printStackTrace();
    }

  }

  /*
   * (non-Javadoc)
   * @see javax.jms.MessageListener#onMessage(javax.jms.Message)
   */
  public void onMessage(Message message) {
    try {
      if (message instanceof TextMessage) {
        TextMessage textMessage = (TextMessage) message;
        setMessageContent(textMessage.getText());
        System.err.println(">> Current Message: " + textMessage.getText());
      } else {
        setMessageContent(message.toString());
      }
    } catch (JMSException e) {
      System.err.println("JMS Error occured while processing a message.");
      e.printStackTrace();
    }
  }

}