ConfigChangeTopicMDB.java

//
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * Agfa Healthcare.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
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 * See @authors listed below
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package org.dcm4chee.conf.notif;

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

import javax.annotation.Resource;
import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.inject.Inject;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.ObjectMessage;

/**
 * Receives JMS messages carrying config change events and distributes 
 * them locally using CDI events.
 * 
 * @author Alexander Hoermandinger <alexander.hoermandinger@agfa.com>
 */
@MessageDriven(name = "ConfigChangeTopicMDB", activationConfig = {
        @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Topic"),
        @ActivationConfigProperty(propertyName = "destination", propertyValue = ConfigChangeTopicMDB.CONFIG_CHANGE_JMS_TOPIC),
        @ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge")})
public class ConfigChangeTopicMDB implements MessageListener {
    private final static Logger LOGGER = LoggerFactory.getLogger(ConfigChangeTopicMDB.class);

    private final static String JBOSS_NODE_NAME_SYSTEM_PROP = "jboss.node.name";
    
    static final String CONFIG_CHANGE_JMS_TOPIC = "topic/DicomConfigurationChangeTopic";
    static final String QUALIFIED_CONFIG_CHANGE_JMS_TOPIC = "java:/" + CONFIG_CHANGE_JMS_TOPIC;
    static final String SENDING_NODE_MSG_PROP = "SENDING_NODE";
    
    @Inject
    private ConfigNotificationService notifService;

    @Resource(lookup="java:app/AppName")
    private String appName;
    
    @Override
    public void onMessage(Message rcvMessage) {
        ObjectMessage msg = null;
        try {
            if (rcvMessage instanceof ObjectMessage) {
                msg = (ObjectMessage) rcvMessage;
                
                String nodeName = getNodeName();
                String sendingNode = msg.getStringProperty(SENDING_NODE_MSG_PROP);
                
                ConfigChangeEvent event = (ConfigChangeEvent)msg.getObject();
                LOGGER.info("Node '{}', deployment '{}' received config changed event from sending node {}: {}", nodeName, appName, sendingNode, event);
                
                notifService.sendLocalScopedConfigChangeNotification(event);
            } else {
                LOGGER.warn("JMS message event has wrong type: " + rcvMessage.getClass().getName());
            }
        } catch (Exception e) {
            throw new RuntimeException("Error while receiving / forwarding config change JMS message", e);
        }
    }
    
    public static String getNodeName() {
        return System.getProperty(JBOSS_NODE_NAME_SYSTEM_PROP);
    }
}