001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.camel.management;
018
019import java.util.EventObject;
020import java.util.concurrent.atomic.AtomicLong;
021import javax.management.Notification;
022import javax.management.NotificationBroadcasterSupport;
023
024import org.apache.camel.api.management.JmxNotificationBroadcasterAware;
025import org.apache.camel.spi.EventNotifier;
026import org.apache.camel.support.EventNotifierSupport;
027import org.slf4j.Logger;
028import org.slf4j.LoggerFactory;
029
030/**
031 * A JMX based {@link EventNotifier} which broadcasts JMX {@link Notification}s.
032 *
033 * @version 
034 */
035public class JmxNotificationEventNotifier extends EventNotifierSupport implements JmxNotificationBroadcasterAware {
036    private static final Logger LOG = LoggerFactory.getLogger(JmxNotificationEventNotifier.class);
037    private final AtomicLong counter = new AtomicLong();
038    private NotificationBroadcasterSupport notificationBroadcaster;
039    private String source = "Camel";
040
041    public void setNotificationBroadcaster(NotificationBroadcasterSupport broadcaster) {
042        notificationBroadcaster = broadcaster;
043    }
044
045    public void notify(EventObject event) throws Exception {
046        if (notificationBroadcaster != null) {
047            // its recommended to send light weight events and we don't want to have the entire Exchange/CamelContext etc
048            // serialized as these are the typical source of the EventObject. So we use our own source which is just
049            // a human readable name, which can be configured.
050            String type = event.getClass().getSimpleName();
051            String message = event.toString();
052            Notification notification = new Notification(type, source, counter.getAndIncrement(), message);
053
054            LOG.trace("Broadcasting JMX notification: {}", notification);
055            notificationBroadcaster.sendNotification(notification);
056        }
057    }
058
059    public boolean isEnabled(EventObject event) {
060        return true;
061    }
062
063    protected void doStart() throws Exception {
064        counter.set(0);
065    }
066
067    protected void doStop() throws Exception {
068        // noop
069    }
070
071    public String getSource() {
072        return source;
073    }
074
075    /**
076     * Sets the source to be used when broadcasting events.
077     * The source is just a readable identifier which helps the receiver see where the event is coming from.
078     * You can assign a value such a server or application name etc.
079     * <p/>
080     * By default <tt>Camel</tt> will be used as source.
081     *
082     * @param source  the source
083     */
084    public void setSource(String source) {
085        this.source = source;
086    }
087}