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/*
* Copyright (c) 2007-2009, 2011, 2012 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.internal.jms;
import org.eclipse.net4j.internal.jms.bundle.OM;
import org.eclipse.net4j.internal.jms.messages.Messages;
import org.eclipse.net4j.util.lifecycle.Lifecycle;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
public class MessageConsumerImpl extends Lifecycle implements MessageConsumer
{
private static final long DO_NOT_WAIT = -1L;
private SessionImpl session;
private long consumerID;
private DestinationImpl destination;
private String messageSelector;
private MessageListener messageListener;
/**
* Incoming messages
*/
private BlockingQueue<MessageImpl> messages = new LinkedBlockingQueue<MessageImpl>();
public MessageConsumerImpl(SessionImpl session, long consumerID, DestinationImpl destination, String messageSelector)
{
this.session = session;
this.consumerID = consumerID;
this.destination = destination;
this.messageSelector = messageSelector;
}
public SessionImpl getSession()
{
return session;
}
public long getConsumerID()
{
return consumerID;
}
public DestinationImpl getDestination()
{
return destination;
}
public String getMessageSelector()
{
return messageSelector;
}
public MessageListener getMessageListener()
{
return messageListener;
}
public void setMessageListener(MessageListener listener)
{
messageListener = listener;
if (messageListener != null)
{
session.addWork(this);
}
}
public Message receive() throws JMSException
{
return receive(Long.MAX_VALUE);
}
public Message receive(long timeout) throws JMSException
{
if (messageListener != null)
{
throw new JMSException(Messages.getString("MessageConsumerImpl.0")); //$NON-NLS-1$
}
if (timeout == DO_NOT_WAIT)
{
return messages.poll();
}
try
{
return messages.poll(timeout, TimeUnit.MILLISECONDS);
}
catch (InterruptedException ex)
{
throw new JMSException(ex.getMessage());
}
}
public Message receiveNoWait() throws JMSException
{
return receive(DO_NOT_WAIT);
}
public void close()
{
throw new NotYetImplementedException();
}
public void handleServerMessage(MessageImpl message)
{
messages.add(message);
if (messageListener != null)
{
session.addWork(this);
}
}
public void dispatchMessage()
{
MessageListener listener = messageListener;
if (listener != null)
{
MessageImpl message = messages.poll();
if (message == null)
{
OM.LOG.warn(Messages.getString("MessageConsumerImpl.1")); //$NON-NLS-1$
return;
}
try
{
listener.onMessage(message);
if (!session.getTransacted() && session.getAcknowledgeMode() != Session.CLIENT_ACKNOWLEDGE)
{
session.acknowledgeMessages(this);
}
}
catch (RuntimeException ex)
{
OM.LOG.warn(ex);
}
}
}
}
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