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 */ 017 package org.apache.commons.monitoring.aop; 018 019 import org.apache.commons.monitoring.configuration.Configuration; 020 import org.apache.commons.monitoring.util.ClassLoaders; 021 import org.apache.commons.proxy.Invoker; 022 import org.apache.commons.proxy.ProxyFactory; 023 024 import java.lang.reflect.InvocationTargetException; 025 import java.lang.reflect.Method; 026 027 public final class MonitoringProxyFactory { 028 private static final ProxyFactory PROXY_FACTORY = Configuration.newInstance(ProxyFactory.class); 029 030 public static <T> T monitor(final Class<T> clazz, final Object instance) { 031 return clazz.cast(PROXY_FACTORY.createInvokerProxy(ClassLoaders.current(), new MonitoringHandler(instance), new Class<?>[]{clazz})); 032 } 033 034 private MonitoringProxyFactory() { 035 // no-op 036 } 037 038 private static class MonitoringHandler extends AbstractPerformanceInterceptor<Invocation> implements Invoker { 039 private final Object instance; 040 041 public MonitoringHandler(final Object instance) { 042 this.instance = instance; 043 } 044 045 @Override 046 public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable { 047 return doInvoke(new Invocation(instance, method, args)); 048 } 049 050 @Override 051 protected Object proceed(final Invocation invocation) throws Throwable { 052 try { 053 return invocation.method.invoke(invocation.target, invocation.args); 054 } catch (final InvocationTargetException ite) { 055 throw ite.getCause(); 056 } 057 } 058 059 @Override 060 protected String getCounterName(final Invocation invocation) { 061 return getCounterName(invocation.target, invocation.method); 062 } 063 } 064 065 private static class Invocation { 066 private final Object target; 067 private final Method method; 068 private final Object[] args; 069 070 private Invocation(final Object target, final Method method, final Object[] args) { 071 this.target = target; 072 this.method = method; 073 this.args = args; 074 } 075 } 076 }