/*
 * 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.servicemix.components.jms;

import javax.jbi.JBIException;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.Session;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.jms.core.JmsTemplate;

/**
 * A component which uses a {@link JmsTemplate} to consume messages from a
 * destination.
 *
 * @version $Revision: 2153 $
 */
public class JmsReceiverComponent extends JmsInBinding implements InitializingBean {
    private JmsTemplate template;
    private String selector;
    private MessageConsumer consumer;
    private ConnectionFactory connectionFactory;
    private Connection connection;
    private Session session;

    public void afterPropertiesSet() throws Exception {
        if (template == null) {
            throw new IllegalArgumentException("Must have a template set");
        }
    }
    
    public void start() throws JBIException {
        // Start receiving messages only when the component has actually been started.
        super.start();
        try {
            connectionFactory = template.getConnectionFactory();
            /*
             * Component code did not work for JMS 1.02 compliant provider because uses APIs
             * that did not exist in JMS 1.02 : ConnectionFactory.createConnection,
             * Connection.createSession
             */
            if (template instanceof org.springframework.jms.core.JmsTemplate102) {
                //Note1 - would've preferred to call JmsTemplate102 methods but they are protected.
                if (template.isPubSubDomain()) {
                    javax.jms.TopicConnection tc;
                    connection = tc = ((javax.jms.TopicConnectionFactory)connectionFactory).createTopicConnection();
                    session = tc.createTopicSession(template.isSessionTransacted(), template.getSessionAcknowledgeMode());
                }
                else {
                    javax.jms.QueueConnection qc;
                    connection = qc = ((javax.jms.QueueConnectionFactory)connectionFactory).createQueueConnection();
                    session = qc.createQueueSession(template.isSessionTransacted(), template.getSessionAcknowledgeMode());
                }
            } else { // JMS 1.1 style
                connection = connectionFactory.createConnection();
                session = connection.createSession(template.isSessionTransacted(), template.getSessionAcknowledgeMode());
            }

            Destination defaultDestination = template.getDefaultDestination();
            if (defaultDestination == null) {
                defaultDestination = template.getDestinationResolver().resolveDestinationName(session, template.getDefaultDestinationName(),
                        template.isPubSubDomain());
            }

            /*
             * Component code did not work for JMS 1.02 compliant provider because uses APIs
             * that did not exist in JMS 1.02: Session.createConsumer
             */
            if (template instanceof org.springframework.jms.core.JmsTemplate102) {
                //Note1 - would've preferred to call JmsTemplate102.createConsumer but it is protected. Code below is same.
                //Note2 - assert that defaultDestination is correct type according to isPubSubDomain()
                if (template.isPubSubDomain()) {
                    consumer = ((javax.jms.TopicSession)session).createSubscriber((javax.jms.Topic)defaultDestination, selector, template.isPubSubNoLocal());
                } else {
                    consumer = ((javax.jms.QueueSession)session).createReceiver((javax.jms.Queue)defaultDestination, selector);
                }
            } else { // JMS 1.1 style
                consumer = session.createConsumer(defaultDestination, selector);
            }
            connection.start();
            consumer.setMessageListener(this);
        } catch (JMSException e) {
            throw new JBIException("Unable to start jms component", e);
        }
    }

    public void stop() throws JBIException {
        try {
            if (consumer != null) {
                consumer.close();
            }
            if (session != null) {
                session.close();
            }
            if (connection != null) {
                connection.close();
            }
        } catch (JMSException e) {
            throw new JBIException("Unable to stop jms component", e);
        } finally {
            connection = null;
            session = null;
            consumer = null;
        }
    }

    public JmsTemplate getTemplate() {
        return template;
    }

    public void setTemplate(JmsTemplate template) {
        this.template = template;
    }

    public String getSelector() {
        return selector;
    }

    public void setSelector(String selector) {
        this.selector = selector;
    }

}

