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The ActiveMQ Message Broker implementation
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/**
 * 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 org.apache.activemq.network.jms;

import javax.jms.Connection;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueSender;
import javax.jms.QueueSession;
import javax.jms.Session;

/**
 * A Destination bridge is used to bridge Queues between to different JMS systems
 */
class QueueBridge extends DestinationBridge {
    protected Queue consumerQueue;
    protected Queue producerQueue;
    protected QueueSession consumerSession;
    protected QueueSession producerSession;

    protected String selector;
    protected QueueSender producer;
    protected QueueConnection consumerConnection;
    protected QueueConnection producerConnection;

    public void stop() throws Exception {
        super.stop();
        if (consumerSession != null) {
            consumerSession.close();
        }
        if (producerSession != null) {
            producerSession.close();
        }
    }

    protected MessageConsumer createConsumer() throws JMSException {
        // set up the consumer
        if (consumerConnection == null) return null;
        consumerSession = consumerConnection.createQueueSession(false, Session.CLIENT_ACKNOWLEDGE);
        MessageConsumer consumer = null;

        if (selector != null && selector.length() > 0) {
            consumer = consumerSession.createReceiver(consumerQueue, selector);
        } else {
            consumer = consumerSession.createReceiver(consumerQueue);
        }

        consumer.setMessageListener(this);

        return consumer;
    }

    protected synchronized MessageProducer createProducer() throws JMSException {
        if (producerConnection == null) return null;
        producerSession = producerConnection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
        producer = producerSession.createSender(null);
        return producer;
    }

    protected synchronized void sendMessage(Message message) throws JMSException {
        if (producer == null && createProducer() == null) {
            throw new JMSException("Producer for remote queue not available.");
        }
        try {
            producer.send(producerQueue, message);
        } catch (JMSException e) {
            producer = null;
            throw e;
        }
    }

    /**
     * @return Returns the consumerConnection.
     */
    public QueueConnection getConsumerConnection() {
        return consumerConnection;
    }

    /**
     * @param consumerConnection The consumerConnection to set.
     */
    public void setConsumerConnection(QueueConnection consumerConnection) {
        this.consumerConnection = consumerConnection;
        if (started.get()) {
            try {
                createConsumer();
            } catch(Exception e) {
                jmsConnector.handleConnectionFailure(getConnnectionForConsumer());
            }
        }
    }

    /**
     * @return Returns the consumerQueue.
     */
    public Queue getConsumerQueue() {
        return consumerQueue;
    }

    /**
     * @param consumerQueue The consumerQueue to set.
     */
    public void setConsumerQueue(Queue consumerQueue) {
        this.consumerQueue = consumerQueue;
    }

    /**
     * @return Returns the producerConnection.
     */
    public QueueConnection getProducerConnection() {
        return producerConnection;
    }

    /**
     * @param producerConnection The producerConnection to set.
     */
    public void setProducerConnection(QueueConnection producerConnection) {
        this.producerConnection = producerConnection;
    }

    /**
     * @return Returns the producerQueue.
     */
    public Queue getProducerQueue() {
        return producerQueue;
    }

    /**
     * @param producerQueue The producerQueue to set.
     */
    public void setProducerQueue(Queue producerQueue) {
        this.producerQueue = producerQueue;
    }

    /**
     * @return Returns the selector.
     */
    public String getSelector() {
        return selector;
    }

    /**
     * @param selector The selector to set.
     */
    public void setSelector(String selector) {
        this.selector = selector;
    }

    protected Connection getConnnectionForConsumer() {
        return getConsumerConnection();
    }

    protected Connection getConnectionForProducer() {
        return getProducerConnection();
    }
}