ConfigChangeTopicBroker.java

//
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 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
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 * The Initial Developer of the Original Code is
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package org.dcm4chee.conf.notif;

import javax.annotation.Resource;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.ObjectMessage;
import javax.jms.Session;
import javax.jms.Topic;

import org.dcm4che3.conf.core.api.ConfigChangeEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Forwards configuration change events to all cluster nodes via JMS.
 *
 * @author Alexander Hoermandinger <alexander.hoermandinger@agfa.com>
 */
public class ConfigChangeTopicBroker {
    private static final Logger LOGGER = LoggerFactory.getLogger(ConfigChangeTopicBroker.class);

    @Resource(mappedName = "java:/ConnectionFactory")
    private ConnectionFactory connectionFactory;

    @Resource(mappedName = ConfigChangeTopicMDB.QUALIFIED_CONFIG_CHANGE_JMS_TOPIC)
    private Topic topic;

    public void forwardToClusterNodes(ConfigChangeEvent event) {
        try {
            Connection connection = null;
            try {
                connection = connectionFactory.createConnection();
                Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
                MessageProducer messageProducer = session.createProducer(topic);
                connection.start();

                ObjectMessage msg = session.createObjectMessage(event);

                // attach name of sending node -> allows to filter on receiver side
                msg.setStringProperty(ConfigChangeTopicMDB.SENDING_NODE_MSG_PROP,
                        ConfigChangeTopicMDB.getNodeName());

                LOGGER.info("Sending cluster-wide config change notification (changed paths " + event.getChangedPaths() + ")");

                messageProducer.send(msg);
            } finally {
                connection.close();
            }
        } catch (JMSException e) {
            LOGGER.error("Error while sending JMS message", e);
        }
    }

}