core/src/main/java/flex/messaging/services/messaging/adapters/JMSQueueConsumer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 flex.messaging.services.messaging.adapters;

import javax.jms.JMSException;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSession;
import javax.naming.NamingException;

import flex.messaging.MessageException;

/**
 * A <code>JMSConsumer</code> subclass specifically for JMS Queue receivers.
 */
public class JMSQueueConsumer extends JMSConsumer
{
    //--------------------------------------------------------------------------
    //
    // Initialize, validate, start, and stop methods.
    //
    //--------------------------------------------------------------------------

    /**
     * Starts the <code>JMSQueueConsumer</code>.
     *
     * @throws NamingException The thrown naming exception.
     * @throws JMSException The thrown JMS exception.
     */
    public void start() throws NamingException, JMSException
    {
        super.start();

        // Establish queue
        Queue queue = null;
        try
        {
            queue = (Queue)destination;
        }
        catch (ClassCastException cce)
        {
            // JMS queue proxy for JMS destination ''{0}'' has a destination type of ''{1}'' which is not Queue.
            MessageException me = new MessageException();
            me.setMessage(JMSConfigConstants.NON_QUEUE_DESTINATION, new Object[] {destinationJndiName, destination.getClass().getName()});
            throw me;
        }

        // Create connection
        try
        {
            QueueConnectionFactory queueFactory = (QueueConnectionFactory)connectionFactory;
            if (connectionCredentials != null)
                connection = queueFactory.createQueueConnection(connectionCredentials.getUsername(), connectionCredentials.getPassword());
            else
                connection = queueFactory.createQueueConnection();
        }
        catch (ClassCastException cce)
        {
            // JMS queue proxy for JMS destination ''{0}'' has a connection factory type of ''{1}'' which is not QueueConnectionFactory.
            MessageException me = new MessageException();
            me.setMessage(JMSConfigConstants.NON_QUEUE_FACTORY, new Object[] {destinationJndiName, connectionFactory.getClass().getName()});
            throw me;
        }

        QueueConnection queueConnection = (QueueConnection)connection;

        // Create queue session on the connection
        session = queueConnection.createQueueSession(false, getAcknowledgeMode());

        // Create receiver on the queue session
        QueueSession queueSession = (QueueSession) session;

        // Handle message selectors
        if (selectorExpression != null)
            consumer = queueSession.createReceiver(queue, selectorExpression);
        else
            consumer = queueSession.createReceiver(queue);

        startMessageReceiver();
    }
}