org.apache.stratos.adc.topology.mgt.subscriber.TopologySubscriber.java Source code

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Here is the source code for org.apache.stratos.adc.topology.mgt.subscriber.TopologySubscriber.java

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/*
 *  Copyright (c) 2009, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 *  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.stratos.adc.topology.mgt.subscriber;

import java.util.Properties;

import javax.jms.*;
import javax.naming.InitialContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.stratos.adc.topology.mgt.util.TopologyConstants;

public class TopologySubscriber {

    private static final Log log = LogFactory.getLog(TopologySubscriber.class);

    public static void subscribe(String topicName) {
        Properties initialContextProperties = new Properties();
        TopicSubscriber topicSubscriber = null;
        TopicSession topicSession = null;
        TopicConnection topicConnection = null;
        InitialContext initialContext = null;

        initialContextProperties.put("java.naming.factory.initial",
                "org.wso2.andes.jndi.PropertiesFileInitialContextFactory");

        String mbServerIp = System.getProperty(TopologyConstants.MB_SERVER_IP) == null
                ? TopologyConstants.DEFAULT_MB_SERVER_IP
                : System.getProperty(TopologyConstants.MB_SERVER_IP);

        String connectionString = "amqp://admin:admin@clientID/carbon?brokerlist='tcp://" + mbServerIp
                + "'&reconnect='true'";
        initialContextProperties.put("connectionfactory.qpidConnectionfactory", connectionString);

        try {
            initialContext = new InitialContext(initialContextProperties);
            TopicConnectionFactory topicConnectionFactory = (TopicConnectionFactory) initialContext
                    .lookup("qpidConnectionfactory");
            topicConnection = topicConnectionFactory.createTopicConnection();
            topicConnection.start();
            topicSession = topicConnection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);

            Topic topic = topicSession.createTopic(topicName);
            topicSubscriber = topicSession.createSubscriber(topic);

            topicSubscriber.setMessageListener(new TopologyListener());

        } catch (Exception e) {
            log.error(e.getMessage(), e);

            try {
                if (topicSubscriber != null) {
                    topicSubscriber.close();
                }

                if (topicSession != null) {
                    topicSession.close();
                }

                if (topicConnection != null) {
                    topicConnection.close();
                }
            } catch (JMSException e1) {
                // ignore
            }

        } finally {
            // start the health checker
            Thread healthChecker = new Thread(new TopicHealthChecker(topicName, topicSubscriber));
            healthChecker.start();
        }
    }

}