/**
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided
* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
* statements and notices. Redistributions must also contain a
* copy of this document.
*
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. The name "Exolab" must not be used to endorse or promote
* products derived from this Software without prior written
* permission of Exoffice Technologies. For written permission,
* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Exoffice Technologies. Exolab is a registered
* trademark of Exoffice Technologies.
*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 2000-2005 (C) Exoffice Technologies Inc. All Rights Reserved.
*
* $Id: JmsConnectionConsumer.java,v 1.2 2005/03/18 03:36:37 tanderson Exp $
*/
package org.exolab.jms.client;
import javax.jms.Connection;
import javax.jms.ConnectionConsumer;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.ServerSession;
import javax.jms.ServerSessionPool;
import javax.jms.Session;
import javax.jms.Topic;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Implementation of the <code>javax.jms.ConnectionConsumer</code> interface.
*
* @author <a href="mailto:jima@comware.com.au">Jim Alateras</a>
* @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
* @version $Revision: 1.2 $ $Date: 2005/03/18 03:36:37 $
*/
class JmsConnectionConsumer
implements ConnectionConsumer, MessageListener {
/**
* The session to receive messages via.
*/
private Session _session;
/**
* The consumer of messages.
*/
private MessageConsumer _consumer;
/**
* The server session pool.
*/
private ServerSessionPool _pool;
/**
* The logger
*/
private static final Log _log =
LogFactory.getLog(JmsConnectionConsumer.class);
/**
* Construct a new <code>JmsConnectionConsumer</code>.
*
* @param connection the connection which created this
* @param destination the destination to access
* @param pool the server session pool
* @param selector the message selector. May be <code>null</code>
* @param maxMessages the maximum number of messages that can be
* assigned to a server session at one time
* @throws JMSException if the consumer cannot be constructed
*/
public JmsConnectionConsumer(Connection connection, Destination destination,
ServerSessionPool pool, String selector,
int maxMessages)
throws JMSException {
this(connection, destination, null, pool, selector, maxMessages);
}
/**
* Construct a new <code>JmsConnectionConsumer</code>.
*
* @param connection the connection which created this
* @param destination the destination to access
* @param subscriptionName the durable subscription name. May be
* <code>null</code>
* @param pool the server session pool
* @param selector the message selector. May be <code>null</code>
* @param maxMessages the maximum number of messages that can be
* assigned to a server session at one time
* @throws JMSException if the consumer cannot be constructed
*/
public JmsConnectionConsumer(Connection connection, Destination destination,
String subscriptionName,
ServerSessionPool pool, String selector,
int maxMessages)
throws JMSException {
if (connection == null) {
throw new IllegalArgumentException("Argument 'connection' is null");
}
if (destination == null) {
throw new IllegalArgumentException(
"Argument 'destination' is null");
}
if (pool == null) {
throw new IllegalArgumentException("Argument 'pool' is null");
}
if (maxMessages <= 0) {
throw new IllegalArgumentException(
"Argument 'maxMessages' must be > 0");
}
_pool = pool;
_session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
if (subscriptionName == null) {
_consumer = _session.createConsumer(destination, selector, false);
} else {
_consumer = _session.createDurableSubscriber((Topic) destination,
subscriptionName,
selector, false);
}
_consumer.setMessageListener(this);
}
/**
* Returns the server session pool associated with this connection consumer.
*
* @return the server session pool used by this connection consumer
*/
public ServerSessionPool getServerSessionPool() {
return _pool;
}
/**
* Close the connection consumer, freeing any allocated resources.
*
* @throws JMSException if the consumer cannot be closed
*/
public void close() throws JMSException {
try {
_consumer.close();
_session.close();
} finally {
_pool = null;
_consumer = null;
_session = null;
}
}
/**
* Impmentation of MessageListener.onMessage, to receive messages
* from the server. In this most simple case, it loads each message into a
* server session and calls the start method.
*
* @param message the message
*/
public void onMessage(Message message) {
try {
// not very sophisticated at this point. Simply get a session
// from the pool, put the message in it, and start it.
ServerSession serverSession = _pool.getServerSession();
JmsSession session = (JmsSession) serverSession.getSession();
message.acknowledge();
session.addMessage(message);
serverSession.start();
} catch (Exception exception) {
_log.error(exception, exception);
}
}
}