messagebean.java

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/*
 * Copyright (c) 2003 Sun Microsystems, Inc.  All rights reserved.  U.S.
 * Government Rights - Commercial software.  Government users are subject
 * to the Sun Microsystems, Inc. standard license agreement and
 * applicable provisions of the FAR and its supplements.  Use is subject
 * to license terms.
 *
 * This distribution may include materials developed by third parties.
 * Sun, Sun Microsystems, the Sun logo, Java and J2EE are trademarks
 * or registered trademarks of Sun Microsystems, Inc. in the U.S. and
 * other countries.
 *
 * Copyright (c) 2003 Sun Microsystems, Inc. Tous droits reserves.
 *
 * Droits du gouvernement americain, utilisateurs gouvernementaux - logiciel
 * commercial. Les utilisateurs gouvernementaux sont soumis au contrat de
 * licence standard de Sun Microsystems, Inc., ainsi qu'aux dispositions
 * en vigueur de la FAR (Federal Acquisition Regulations) et des
 * supplements a celles-ci.  Distribue par des licences qui en
 * restreignent l'utilisation.
 *
 * Cette distribution peut comprendre des composants developpes par des
 * tierces parties. Sun, Sun Microsystems, le logo Sun, Java et J2EE
 * sont des marques de fabrique ou des marques deposees de Sun
 * Microsystems, Inc. aux Etats-Unis et dans d'autres pays.
 */
import javax.ejb.*;
import javax.naming.*;
import javax.jms.*;

/**
 * The MessageBean class is a message-driven bean.  It implements
 * the javax.ejb.MessageDrivenBean and javax.jms.MessageListener 
 * interfaces. It is defined as public (but not final or 
 * abstract).  It defines a constructor and the methods
 * setMessageDrivenContext, ejbCreate, onMessage, and 
 * ejbRemove.
 */
public class MessageBean implements MessageDrivenBean, 
        MessageListener {

    private transient MessageDrivenContext mdc = null;
    private Context context;
    
    /**
     * Constructor, which is public and takes no arguments.
     */
    public MessageBean() {
        System.out.println("In MessageBean.MessageBean()");
    }

    /**
     * setMessageDrivenContext method, declared as public (but 
     * not final or static), with a return type of void, and 
     * with one argument of type javax.ejb.MessageDrivenContext.
     *
     * @param mdc    the context to set
     */
    public void setMessageDrivenContext(MessageDrivenContext mdc)
    {
        System.out.println("In " +
            "MessageBean.setMessageDrivenContext()");
        this.mdc = mdc;
    }

    /**
     * ejbCreate method, declared as public (but not final or 
     * static), with a return type of void, and with no 
     * arguments.
     */
    public void ejbCreate() {
        System.out.println("In MessageBean.ejbCreate()");
    }

    /**
     * onMessage method, declared as public (but not final or 
     * static), with a return type of void, and with one argument
     * of type javax.jms.Message.
     *
     * Casts the incoming Message to a TextMessage and displays 
     * the text.
     *
     * @param inMessage    the incoming message
     */
    public void onMessage(Message inMessage) {
        TextMessage msg = null;

        try {
            if (inMessage instanceof TextMessage) {
                msg = (TextMessage) inMessage;
                System.out.println("MESSAGE BEAN: Message " +
                    "received: " + msg.getText());
            } else {
                System.out.println("Message of wrong type: " +
                    inMessage.getClass().getName());
            }
        } catch (JMSException e) {
            System.err.println("MessageBean.onMessage: " +
                "JMSException: " + e.toString());
            mdc.setRollbackOnly();
        } catch (Throwable te) {
            System.err.println("MessageBean.onMessage: " +
                "Exception: " + te.toString());
        }
    }
    
    /**
     * ejbRemove method, declared as public (but not final or 
     * static), with a return type of void, and with no 
     * arguments.
     */
    public void ejbRemove() {
        System.out.println("In MessageBean.remove()");
    }
}