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jMonit is a monitoring toolkit for java application. It provides a simple API to instrument the application, and an extensible infrastructure to gather monitored datas and build monitoring reports. On JEE applications, it provides a web UI out of the box for monitoring and tweaking the application.

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/*
 ~ Copyright 2006-2007 Nicolas De Loof.
 ~
 ~ 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.jmonit.events;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * A synchronous implementation of the MonitoringEventBus.
 * 
 * "Synchronous" means the event is dispatched to and consumed by all listeners
 * before the emitter can resume processing.
 * 
 * @author Nicolas De Loof
 */
public class DefaultMonitoringEventBus
    implements MonitoringEventBus
{
    /**
     * Registered listeners
     */
    private List listeners =
        new CopyOnWriteArrayList();

    /**
     * {@inheritDoc}
     * 
     * @see org.jmonit.events.MonitoringEventBus#addListener(org.jmonit.events.MonitoringEventListener)
     */
    public void addListener( final MonitoringEventListener listener )
    {
        if ( listener != null )
        {
            listeners.add( listener );
        }
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.jmonit.events.MonitoringEventBus#removeListener(MonitoringEventListener)
     */
    public void removeListener( final MonitoringEventListener listener )
    {
        listeners.remove( listener );
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.jmonit.events.MonitoringEventBus#hasListener(MonitoringEventListener)
     */
    public boolean hasListener( final MonitoringEventListener listener )
    {
        return listeners.contains( listener );
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.jmonit.events.MonitoringEventBus#fireMonitoringEvent(org.jmonit.events.MonitoringEvent)
     */
    public void fireMonitoringEvent( final MonitoringEvent event )
    {
        for ( MonitoringEventListener listener : listeners )
        {
            listener.onMonitoringEvent( event );
        }
    }
}