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.activemq.broker.jmx; 018 019import java.util.concurrent.Callable; 020import java.util.concurrent.ExecutionException; 021import java.util.concurrent.ExecutorService; 022import java.util.concurrent.Future; 023import java.util.concurrent.TimeUnit; 024 025import javax.management.MBeanException; 026import javax.management.NotCompliantMBeanException; 027import javax.management.ObjectName; 028import javax.management.ReflectionException; 029 030/** 031 * MBean that invokes the requested operation using an async operation and waits for the result 032 * if the operation times out then an exception is thrown. 033 */ 034public class AsyncAnnotatedMBean extends AnnotatedMBean { 035 036 private ExecutorService executor; 037 private long timeout = 0; 038 039 public <T> AsyncAnnotatedMBean(ExecutorService executor, long timeout, T impl, Class<T> mbeanInterface) throws NotCompliantMBeanException { 040 super(impl, mbeanInterface); 041 042 this.executor = executor; 043 this.timeout = timeout; 044 } 045 046 protected AsyncAnnotatedMBean(Class<?> mbeanInterface) throws NotCompliantMBeanException { 047 super(mbeanInterface); 048 } 049 050 protected Object asyncInvole(String s, Object[] objects, String[] strings) throws MBeanException, ReflectionException { 051 return super.invoke(s, objects, strings); 052 } 053 054 @SuppressWarnings({ "unchecked", "rawtypes" }) 055 public static void registerMBean(ExecutorService executor, long timeout, ManagementContext context, Object object, ObjectName objectName) throws Exception { 056 057 if (timeout < 0 && executor != null) { 058 throw new IllegalArgumentException("async timeout cannot be negative."); 059 } 060 061 if (timeout > 0 && executor == null) { 062 throw new NullPointerException("timeout given but no ExecutorService instance given."); 063 } 064 065 String mbeanName = object.getClass().getName() + "MBean"; 066 067 for (Class c : object.getClass().getInterfaces()) { 068 if (mbeanName.equals(c.getName())) { 069 if (timeout == 0) { 070 context.registerMBean(new AnnotatedMBean(object, c), objectName); 071 } else { 072 context.registerMBean(new AsyncAnnotatedMBean(executor, timeout, object, c), objectName); 073 } 074 return; 075 } 076 } 077 078 context.registerMBean(object, objectName); 079 } 080 081 @Override 082 public Object invoke(String s, Object[] objects, String[] strings) throws MBeanException, ReflectionException { 083 084 final String action = s; 085 final Object[] params = objects; 086 final String[] signature = strings; 087 088 Future<Object> task = executor.submit(new Callable<Object>() { 089 090 @Override 091 public Object call() throws Exception { 092 return asyncInvole(action, params, signature); 093 } 094 }); 095 096 try { 097 return task.get(timeout, TimeUnit.MILLISECONDS); 098 } catch (ExecutionException e) { 099 if (e.getCause() instanceof MBeanException) { 100 throw (MBeanException) e.getCause(); 101 } 102 103 throw new MBeanException(e); 104 } catch (Exception e) { 105 throw new MBeanException(e); 106 } finally { 107 if (!task.isDone()) { 108 task.cancel(true); 109 } 110 } 111 } 112}