/* 
 * Copyright 1999-2004 The Apache Software Foundation
 * Licensed  under the  Apache License,  Version 2.0  (the "License");
 * you may not use  this file  except in  compliance with the License.
 * You may obtain a copy of the License at 
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed  under the  License is distributed on an "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
 * implied.
 * 
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.log.output.jms;

import javax.jms.Message;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSender;
import javax.jms.QueueSession;
import javax.jms.Session;
import org.apache.log.ErrorHandler;

/**
 * A target that writes to a JMS Queue.
 *
 * @author <a href="mailto:mirceatoma@home.com">Mircea Toma</a>
 */
public class JMSQueueTarget
    extends AbstractJMSTarget
{
    ///ConnectionFactory to use
    private QueueConnectionFactory m_factory;

    ///Queue we will send messages to
    private Queue m_queue;

    ///Session associated with queue
    private QueueSession m_session;

    ///Sender for queue
    private QueueSender m_sender;

    ///JMS queue Connection
    private QueueConnection m_connection;

    public JMSQueueTarget( final MessageBuilder builder,
                           final QueueConnectionFactory factory,
                           final Queue queue )
    {
        super( builder );
        m_factory = factory;
        m_queue = queue;
        open();
    }

    public JMSQueueTarget( final MessageBuilder builder,
                           final QueueConnectionFactory factory,
                           final Queue queue,
                           final ErrorHandler handler )
    {
        super( builder, handler );
        m_factory = factory;
        m_queue = queue;
        open();
    }

    protected void send( final Message message )
    {
        try
        {
            m_sender.send( message );
        }
        catch( final Exception e )
        {
            getErrorHandler().error( "Error publishing message", e, null );
        }
    }

    protected Session getSession()
    {
        return m_session;
    }

    protected synchronized void openConnection()
    {
        try
        {
            m_connection = m_factory.createQueueConnection();
            m_connection.start();

            m_session =
                m_connection.createQueueSession( false, Session.AUTO_ACKNOWLEDGE );

            m_sender = m_session.createSender( m_queue );
        }
        catch( final Exception e )
        {
            getErrorHandler().error( "Error starting connection", e, null );
        }
    }

    protected synchronized void closeConnection()
    {
        try
        {
            if( null != m_sender ) m_sender.close();
            if( null != m_session ) m_session.close();
            if( null != m_connection ) m_connection.close();
        }
        catch( Exception e )
        {
            getErrorHandler().error( "Error closing connection", e, null );
        }

        m_sender = null;
        m_session = null;
        m_connection = null;
    }
}