/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.jms.resource;
import com.caucho.config.Config;
import com.caucho.config.ConfigException;
import com.caucho.config.program.ContainerProgram;
import com.caucho.jms.queue.AbstractDestination;
import com.caucho.jms.JmsConnectionFactory;
import com.caucho.util.L10N;
import javax.annotation.*;
import javax.ejb.Startup;
import javax.inject.Singleton;
import javax.jms.*;
import java.util.logging.Logger;
/**
* Configures application listeners, avoiding JCA.
*/
@Singleton
@Startup
public class ListenerResource {
private static L10N L = new L10N(ListenerResource.class);
protected static Logger log
= Logger.getLogger(ListenerResource.class.getName());
private ConnectionFactory _connFactory;
private Connection _conn;
private Destination _destination;
private int _listenerMax = 5;
private ListenerConfig _listenerConfig;
public ListenerResource()
{
}
/**
* Sets the JMS connection factory.
*
* @param factory
*/
public void setConnectionFactory(ConnectionFactory factory)
{
_connFactory = factory;
}
/**
* Sets the JMS Destination (Queue or Topic)
*
* @param destination
*/
public void setDestination(Destination destination)
{
_destination = destination;
}
/**
* Sets the listener constructor.
*/
public void setListener(ListenerConfig config)
{
_listenerConfig = config;
}
/**
* Sets the listener-max
*/
public void setListenerMax(int listenerMax)
{
_listenerMax = listenerMax;
}
@PostConstruct
public void init() throws ConfigException, JMSException
{
if (_destination == null)
throw new ConfigException(L.l("'destination' is required for ListenerResource."));
if (_listenerConfig == null)
throw new ConfigException(L.l("'listener' is required for ListenerResource."));
if (_connFactory == null && _destination instanceof AbstractDestination)
_connFactory = new JmsConnectionFactory();
if (_connFactory == null)
throw new ConfigException(L.l("connection-factory is required for ListenerResource."));
_conn = _connFactory.createConnection();
if (_destination instanceof Topic)
_listenerMax = 1;
start();
}
private void start()
{
try {
for (int i = 0; i < _listenerMax; i++) {
MessageListener listener = _listenerConfig.newInstance();
Session session = _conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageConsumer consumer = session.createConsumer(_destination);
consumer.setMessageListener(listener);
}
_conn.start();
} catch (Throwable e) {
throw new RuntimeException(e);
}
log.fine("ListenerResource[" + _destination + "] started");
}
@PreDestroy
public void stop() throws JMSException
{
_conn.stop();
log.fine("ListenerResource[" + _destination + "] stopped");
}
public static class ListenerConfig {
private Class _type;
private ContainerProgram _init;
/**
* Sets the listener's type.
*
* @param type implementation class of MessageListener
*
* @throws ConfigException
*/
public void setType(Class type) throws ConfigException
{
Config.validate(type, MessageListener.class);
_type = type;
}
/**
* Sets the init program.
*/
public void setInit(ContainerProgram init)
{
_init = init;
}
@PostConstruct
public void init() throws ConfigException
{
if (_type == null)
throw new ConfigException(L.l("'type' is required for listener."));
}
/**
* Creates a new MessageListener
*
* @return the listener
* @throws Throwable
* @throws InstantiationException
*/
public MessageListener newInstance() throws Throwable, InstantiationException
{
MessageListener listener = (MessageListener) _type.newInstance();
if (_init != null)
_init.configure(listener);
return listener;
}
}
}