TimerSessionEJB.java

package com.sun.s1asdev.ejb.timer.restore;

import java.util.Iterator;
import java.util.Collection;
import java.util.Date;

import javax.ejb.TimedObject;
import javax.ejb.Timer;
import javax.ejb.TimerHandle;
import javax.ejb.TimerService;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.ejb.EJBContext;
import javax.ejb.EJBException;
import javax.jms.Session;
import java.rmi.RemoteException;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueConnection;
import javax.jms.Queue;
import javax.jms.QueueSender;
import javax.jms.QueueSession;
import javax.jms.JMSException;
import javax.jms.TextMessage;
import javax.naming.*;

import com.sun.ejb.containers.TimerBean;

public class TimerSessionEJB implements TimedObject, SessionBean 
{
    private SessionContext context;
    private QueueConnection connection;
    private QueueSession session;
    private Queue queue;
    private QueueSender sender;
    
    public void ejbCreate() throws RemoteException {}
    
    public void ejbRemove() throws RemoteException {}
    
    public void setSessionContext(SessionContext sc) {
        context = sc;
    }
    
    
    // business method to create a timer
    public TimerHandle createTimer(long initialDelay, long interval,
                                   String msg) {
        
        try {
            System.out.println("Calling getMessageContext");
            context.getMessageContext();
        } catch(IllegalStateException ise) {
            System.out.println("getMessageContext() successfully threw illegalStateException");
        }
        
        
        TimerService timerService = context.getTimerService();
        Timer timer;
        if( interval == 0 ) {
            timer = timerService.createTimer(initialDelay, msg);
        } else {
            timer = timerService.createTimer(initialDelay, interval,
                                             msg);
        }
        return timer.getHandle();
    }
    
    public void createTimerInOtherServer(String owner, String timerId, 
                                         long initialExpiration,
                                         long intervalDuration, String info) {

        try {
            Date now = new Date();
            TimerBean.testCreate(timerId, context, owner, 
                             new Date(now.getTime() + initialExpiration), 
                                 intervalDuration,
                             info);
        } catch(Exception e) {
            e.printStackTrace();
            throw new EJBException(e);
        }

    }

    public void migrateTimersFrom(String owner) {
        
        TimerBean.testMigrate(owner);

    }

    public void deleteTimers() {

        java.util.Collection timers = context.getTimerService().getTimers();
        for(Iterator iter = timers.iterator(); iter.hasNext();) {
            Timer t = (Timer) iter.next();
            System.out.println("Cancelling timer " + t);
            t.cancel();
        }

    }

    // timer callback method
    public void ejbTimeout(Timer timer) {
        
        String info = (String) timer.getInfo();
        System.out.println("Got ejbTimeout for timer " + info);
        
        try {
            System.out.println("Calling getMessageContext");
            context.getMessageContext();
        } catch(IllegalStateException ise) {
            System.out.println("getMessageContext() successfully threw illegalStateException");
        }
        
        
        // add message to queue
        try {
            
            
            InitialContext ic = new InitialContext();
            QueueConnectionFactory qcFactory = (QueueConnectionFactory)
                ic.lookup("java:comp/env/jms/MyQueueConnectionFactory");
            Queue queue = (Queue) ic.lookup("java:comp/env/jms/MyQueue");
            connection = qcFactory.createQueueConnection();
            
            QueueSession session = connection.createQueueSession(true, Session.AUTO_ACKNOWLEDGE);
            sender  = session.createSender(queue);
            
            TextMessage message = session.createTextMessage();
            message.setText(info);
            System.out.println("Sending time out message");
            sender.send(message);
            System.out.println("Time out message sent");
        } catch(NamingException e) {
            e.printStackTrace();
        } catch(JMSException e) {
            e.printStackTrace();
        }
        finally {
            try {
                if(connection != null) {
                    connection.close();
                    connection = null;
                }
            } catch(Exception e) {
                e.printStackTrace();
            }
        }
    }
    
    public void ejbActivate() {}
    public void ejbPassivate() {}

}