| /* |
| * 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.zest.library.jmx; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import javax.management.*; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * TODO |
| */ |
| public class MBeanTracker |
| { |
| private boolean started = false; |
| private ObjectName pattern; |
| private MBeanServer server; |
| private List<TrackerCallback> callbacks = new ArrayList<TrackerCallback>(); |
| private List<ObjectName> tracked = Collections.synchronizedList( new ArrayList<ObjectName>() ); |
| private RegistrationListener registrationListener; |
| |
| public MBeanTracker(ObjectName pattern, MBeanServer server) |
| { |
| this.pattern = pattern; |
| this.server = server; |
| } |
| |
| public MBeanTracker registerCallback(TrackerCallback callback) |
| { |
| List<TrackerCallback> newList = new ArrayList<TrackerCallback>(callbacks); |
| newList.add(callback); |
| callbacks = newList; |
| return this; |
| } |
| |
| public MBeanTracker unregisterCallback(TrackerCallback callback) |
| { |
| List<TrackerCallback> newList = new ArrayList<TrackerCallback>(callbacks); |
| newList.remove(callback); |
| callbacks = newList; |
| return this; |
| } |
| |
| public Iterable<ObjectName> getTracked() |
| { |
| return tracked; |
| } |
| |
| public void start() |
| { |
| if (!started) |
| { |
| try |
| { |
| registrationListener = new RegistrationListener(); |
| server.addNotificationListener(new ObjectName("JMImplementation:type=MBeanServerDelegate"), registrationListener, null, null); |
| |
| for (ObjectName objectName : server.queryNames(pattern, null)) |
| { |
| for (TrackerCallback callback : callbacks) |
| { |
| try |
| { |
| tracked.add(objectName); |
| callback.addedMBean(objectName, server); |
| } catch (Throwable throwable) |
| { |
| LoggerFactory.getLogger( MBeanTracker.class ).error("Tracker callback threw exception", throwable); |
| } |
| } |
| } |
| |
| started = true; |
| } catch (Exception e) |
| { |
| // Could not start |
| } |
| } |
| } |
| |
| public void stop() |
| { |
| if (started) |
| { |
| try |
| { |
| server.removeNotificationListener(new ObjectName("JMImplementation:type=MBeanServerDelegate"), registrationListener); |
| |
| for (ObjectName objectName : server.queryNames(pattern, null)) |
| { |
| for (TrackerCallback callback : callbacks) |
| { |
| try |
| { |
| callback.removedMBean(objectName, server); |
| tracked.remove(objectName); |
| } catch (Throwable throwable) |
| { |
| LoggerFactory.getLogger(MBeanTracker.class).error("Tracker callback threw exception", throwable); |
| } |
| } |
| } |
| |
| started = false; |
| } catch (Exception e) |
| { |
| // Could not start |
| } |
| } |
| } |
| |
| /** |
| * Callback that is used to notify when MBeans matching the given pattern becomes |
| * added or removed. |
| */ |
| public interface TrackerCallback |
| { |
| void addedMBean(ObjectName newMBean, MBeanServer server) |
| throws Throwable; |
| |
| void removedMBean(ObjectName removedMBean, MBeanServer server) |
| throws Throwable; |
| } |
| |
| /** |
| * Registers the given NotificationListener+NotificationFilter on tracked MBeans. |
| */ |
| public static class NotificationTracker |
| implements TrackerCallback |
| { |
| private NotificationListener listener; |
| private NotificationFilter filter; |
| |
| public NotificationTracker( NotificationListener listener, NotificationFilter filter ) |
| { |
| this.listener = listener; |
| this.filter = filter; |
| } |
| |
| @Override |
| public void addedMBean( ObjectName newMBean, MBeanServer server ) throws Throwable |
| { |
| server.addNotificationListener( newMBean, listener, filter, null); |
| } |
| |
| @Override |
| public void removedMBean( ObjectName removedMBean, MBeanServer server ) throws Throwable |
| { |
| server.removeNotificationListener( removedMBean, listener ); |
| } |
| } |
| |
| private class RegistrationListener |
| implements NotificationListener |
| { |
| @Override |
| public void handleNotification(Notification notification, Object o) |
| { |
| if (notification instanceof MBeanServerNotification ) |
| { |
| MBeanServerNotification serverNotification = (MBeanServerNotification) notification; |
| if (pattern.apply(serverNotification.getMBeanName())) |
| { |
| if (serverNotification.getType().equals(MBeanServerNotification.REGISTRATION_NOTIFICATION)) |
| { |
| for (TrackerCallback callback : callbacks) |
| { |
| try |
| { |
| tracked.add(serverNotification.getMBeanName()); |
| callback.addedMBean(serverNotification.getMBeanName(), server); |
| } catch (Throwable throwable) |
| { |
| LoggerFactory.getLogger(MBeanTracker.class).error("Tracker callback threw exception", throwable); |
| } |
| } |
| } else if (serverNotification.getType().equals(MBeanServerNotification.UNREGISTRATION_NOTIFICATION)) |
| { |
| for (TrackerCallback callback : callbacks) |
| { |
| try |
| { |
| callback.removedMBean(serverNotification.getMBeanName(), server); |
| tracked.remove(serverNotification.getMBeanName()); |
| } catch (Throwable throwable) |
| { |
| LoggerFactory.getLogger(MBeanTracker.class).error("Tracker callback threw exception", throwable); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |