BaseModelMBean.java 文件源码

/**
 * Add a notification event listener to this MBean.
 *
 * @param listener Listener that will receive event notifications
 * @param filter Filter object used to filter event notifications
 *  actually delivered, or <code>null</code> for no filtering
 * @param handback Handback object to be sent along with event
 *  notifications
 *
 * @exception IllegalArgumentException if the listener parameter is null
 */
@Override
public void addNotificationListener(NotificationListener listener,
                                    NotificationFilter filter,
                                    Object handback)
    throws IllegalArgumentException {

    if (listener == null)
        throw new IllegalArgumentException("Listener is null");

    if( log.isDebugEnabled() ) log.debug("addNotificationListener " + listener);

    if (generalBroadcaster == null)
        generalBroadcaster = new BaseNotificationBroadcaster();
    generalBroadcaster.addNotificationListener
        (listener, filter, handback);

    // We'll send the attribute change notifications to all listeners ( who care )
    // The normal filtering can be used.
    // The problem is that there is no other way to add attribute change listeners
    // to a model mbean ( AFAIK ). I suppose the spec should be fixed.
    if (attributeBroadcaster == null)
        attributeBroadcaster = new BaseNotificationBroadcaster();

    if( log.isDebugEnabled() )
        log.debug("addAttributeNotificationListener " + listener);

    attributeBroadcaster.addNotificationListener
            (listener, filter, handback);
}