/*
* JBoss, Home of Professional Open Source.
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* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This 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 (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.test.cts.ejb;
import javax.ejb.MessageDrivenBean;
import javax.ejb.MessageDrivenContext;
import javax.ejb.EJBException;
import javax.jms.MessageListener;
import javax.jms.QueueConnection;
import javax.jms.QueueSession;
import javax.jms.QueueSender;
import javax.jms.QueueConnectionFactory;
import javax.jms.Queue;
import javax.jms.Message;
import javax.jms.TextMessage;
import javax.jms.JMSException;
import javax.naming.InitialContext;
import org.jboss.logging.Logger;
/** An MDB that validates that no more than maxActiveCount MDB instances
are active in the onMessage method.
@author Scott.Stark@jboss.org
@version $Revision: 104442 $
*/
public class StrictlyPooledMDB implements MessageDrivenBean, MessageListener
{
private static Logger log = Logger.getLogger(StrictlyPooledMDB.class);
/** The class wide max count of instances allows */
private static int maxActiveCount = 5;
/** The class wide count of instances active in business code */
private static int activeCount;
private MessageDrivenContext ctx = null;
private QueueConnection queConn;
private QueueSession session;
private QueueSender sender;
private static synchronized int incActiveCount()
{
return activeCount ++;
}
private static synchronized int decActiveCount()
{
return activeCount --;
}
public void setMessageDrivenContext(MessageDrivenContext ctx)
throws EJBException
{
this.ctx = ctx;
try
{
InitialContext iniCtx = new InitialContext();
Integer i = (Integer) iniCtx.lookup("java:comp/env/maxActiveCount");
maxActiveCount = i.intValue();
QueueConnectionFactory factory = (QueueConnectionFactory) iniCtx.lookup("java:/ConnectionFactory");
queConn = factory.createQueueConnection();
session = queConn.createQueueSession(false, QueueSession.AUTO_ACKNOWLEDGE);
Queue queue = (Queue) iniCtx.lookup("queue/B");
sender = session.createSender(queue);
}
catch(Exception e)
{
log.error("Setup failure", e);
throw new EJBException("Setup failure", e);
}
}
public void ejbCreate()
{
}
public void ejbRemove()
{
try
{
if( sender != null )
sender.close();
if( session != null )
session.close();
if( queConn != null )
queConn.close();
}
catch(Exception e)
{
log.error("Failed to close JMS resources", e);
}
}
public void onMessage(Message message)
{
int count = incActiveCount();
log.debug("Begin onMessage, activeCount="+count+", ctx="+ctx);
try
{
Message reply = null;
if( count > maxActiveCount )
{
String msg = "IllegalState, activeCount > maxActiveCount, "
+ count + " > " + maxActiveCount;
// Send an exception
Exception e = new IllegalStateException(msg);
reply = session.createObjectMessage(e);
}
else
{
TextMessage tm = (TextMessage) message;
// Send an ack
reply = session.createTextMessage("Recevied msg="+tm.getText());
}
Thread.currentThread().sleep(1000);
sender.send(reply);
}
catch(JMSException e)
{
log.error("Failed to send error message", e);
}
catch(InterruptedException e)
{
}
finally
{
count = decActiveCount();
log.debug("End onMessage, activeCount="+count+", ctx="+ctx);
}
}
}