/* * Copyright 2002-2010 the original author or authors. * * Licensed 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.springframework.aop.target; import java.util.Collections; import java.util.HashSet; import java.util.Set; import org.springframework.aop.IntroductionAdvisor; import org.springframework.aop.support.DefaultIntroductionAdvisor; import org.springframework.aop.support.DelegatingIntroductionInterceptor; import org.springframework.beans.BeansException; import org.springframework.beans.factory.DisposableBean; import org.springframework.core.NamedThreadLocal; /** * Alternative to an object pool. This TargetSource uses a threading model in which * every thread has its own copy of the target. There's no contention for targets. * Target object creation is kept to a minimum on the running server. * *
Application code is written as to a normal pool; callers can't assume they * will be dealing with the same instance in invocations in different threads. * However, state can be relied on during the operations of a single thread: * for example, if one caller makes repeated calls on the AOP proxy. * *
Cleanup of thread-bound objects is performed on BeanFactory destruction,
* calling their DisposableBean.destroy()
method if available.
* Be aware that many thread-bound objects can be around until the application
* actually shuts down.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Rob Harrop
* @see ThreadLocalTargetSourceStats
* @see org.springframework.beans.factory.DisposableBean#destroy()
*/
public class ThreadLocalTargetSource extends AbstractPrototypeBasedTargetSource
implements ThreadLocalTargetSourceStats, DisposableBean {
/**
* ThreadLocal holding the target associated with the current
* thread. Unlike most ThreadLocals, which are static, this variable
* is meant to be per thread per instance of the ThreadLocalTargetSource class.
*/
private final ThreadLocal