| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.felix.mosgi.jmx.agent.mx4j.server.interceptor; |
| |
| import javax.management.ListenerNotFoundException; |
| import javax.management.Notification; |
| import javax.management.NotificationFilter; |
| import javax.management.NotificationListener; |
| import javax.management.ObjectName; |
| |
| import org.apache.felix.mosgi.jmx.agent.mx4j.server.MBeanMetaData; |
| |
| /** |
| * Interceptor that takes care of replacing the source of Notifications to the |
| * ObjectName of the NotificationBroadcaster that emitted it. |
| * |
| * @author <a href="mailto:biorn_steedom@users.sourceforge.net">Simone Bordet</a> |
| * @version $Revision: 1.1.1.1 $ |
| */ |
| public class NotificationListenerMBeanServerInterceptor extends DefaultMBeanServerInterceptor |
| { |
| private static class ListenerWrapper implements NotificationListener |
| { |
| private final NotificationListener listener; |
| private final ObjectName objectName; |
| |
| private ListenerWrapper(NotificationListener listener, ObjectName name) |
| { |
| this.listener = listener; |
| this.objectName = name; |
| } |
| |
| public void handleNotification(Notification notification, Object handback) |
| { |
| // The JMX spec does not specify how to change the source to be the ObjectName |
| // of the broadcaster. If we serialize the calls to the listeners, then it's |
| // possible to change the source and restore it back to the old value before |
| // calling the next listener; but if we want to support concurrent calls |
| // to the listeners, this is not possible. Here I chose to support concurrent |
| // calls so I change the value once and I never restore it. |
| Object src = notification.getSource(); |
| if (!(src instanceof ObjectName)) |
| { |
| // Change the source to be the ObjectName of the notification broadcaster |
| // if we are not already an ObjectName (compliant with RI behaviour) |
| notification.setSource(objectName); |
| } |
| |
| // Notify the real listener |
| NotificationListener listener = getTargetListener(); |
| listener.handleNotification(notification, handback); |
| } |
| |
| private NotificationListener getTargetListener() |
| { |
| return listener; |
| } |
| |
| public int hashCode() |
| { |
| return getTargetListener().hashCode(); |
| } |
| |
| public boolean equals(Object obj) |
| { |
| if (obj == null) return false; |
| if (obj == this) return true; |
| |
| try |
| { |
| ListenerWrapper other = (ListenerWrapper)obj; |
| return getTargetListener().equals(other.getTargetListener()); |
| } |
| catch (ClassCastException ignored) |
| { |
| } |
| return false; |
| } |
| |
| public String toString() |
| { |
| return getTargetListener().toString(); |
| } |
| } |
| |
| public String getType() |
| { |
| return "notificationlistener"; |
| } |
| |
| public void addNotificationListener(MBeanMetaData metadata, NotificationListener listener, NotificationFilter filter, Object handback) |
| { |
| if (isEnabled()) |
| { |
| ListenerWrapper wrapper = new ListenerWrapper(listener, metadata.name); |
| super.addNotificationListener(metadata, wrapper, filter, handback); |
| } |
| else |
| { |
| super.addNotificationListener(metadata, listener, filter, handback); |
| } |
| } |
| |
| public void removeNotificationListener(MBeanMetaData metadata, NotificationListener listener) throws ListenerNotFoundException |
| { |
| if (isEnabled()) |
| { |
| ListenerWrapper wrapper = new ListenerWrapper(listener, metadata.name); |
| super.removeNotificationListener(metadata, wrapper); |
| } |
| else |
| { |
| super.removeNotificationListener(metadata, listener); |
| } |
| } |
| |
| public void removeNotificationListener(MBeanMetaData metadata, NotificationListener listener, NotificationFilter filter, Object handback) throws ListenerNotFoundException |
| { |
| if (isEnabled()) |
| { |
| ListenerWrapper wrapper = new ListenerWrapper(listener, metadata.name); |
| super.removeNotificationListener(metadata, wrapper, filter, handback); |
| } |
| else |
| { |
| super.removeNotificationListener(metadata, listener, filter, handback); |
| } |
| } |
| } |