|
Spring Framework example source code file (ExposeBeanNameAdvisors.java)
The Spring Framework ExposeBeanNameAdvisors.java source code/* * Copyright 2002-2007 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.interceptor; import org.aopalliance.intercept.MethodInterceptor; import org.aopalliance.intercept.MethodInvocation; import org.springframework.aop.Advisor; import org.springframework.aop.ProxyMethodInvocation; import org.springframework.aop.support.DefaultIntroductionAdvisor; import org.springframework.aop.support.DefaultPointcutAdvisor; import org.springframework.aop.support.DelegatingIntroductionInterceptor; import org.springframework.beans.factory.NamedBean; /** * Convenient methods for creating advisors that may be used when autoproxying beans * created with the Spring IoC container, binding the bean name to the current * invocation. May support a <code>bean() pointcut designator with AspectJ. * * <p>Typically used in Spring auto-proxying, where the bean name is known * at proxy creation time. * * @author Rod Johnson * @author Juergen Hoeller * @since 2.0 * @see org.springframework.beans.factory.NamedBean */ public abstract class ExposeBeanNameAdvisors { /** * Binding for the bean name of the bean which is currently being invoked * in the ReflectiveMethodInvocation userAttributes Map. */ private static final String BEAN_NAME_ATTRIBUTE = ExposeBeanNameAdvisors.class.getName() + ".beanName"; /** * Find the bean name for the current invocation. Assumes that an ExposeBeanNameAdvisor * has been included in the interceptor chain, and that the invocation is exposed * with ExposeInvocationInterceptor. * @return the bean name (never <code>null) * @throws IllegalStateException if the bean name has not been exposed */ public static String getBeanName() throws IllegalStateException { return getBeanName(ExposeInvocationInterceptor.currentInvocation()); } /** * Find the bean name for the given invocation. Assumes that an ExposeBeanNameAdvisor * has been included in the interceptor chain. * @param mi MethodInvocation that should contain the bean name as an attribute * @return the bean name (never <code>null) * @throws IllegalStateException if the bean name has not been exposed */ public static String getBeanName(MethodInvocation mi) throws IllegalStateException { if (!(mi instanceof ProxyMethodInvocation)) { throw new IllegalArgumentException("MethodInvocation is not a Spring ProxyMethodInvocation: " + mi); } ProxyMethodInvocation pmi = (ProxyMethodInvocation) mi; String beanName = (String) pmi.getUserAttribute(BEAN_NAME_ATTRIBUTE); if (beanName == null) { throw new IllegalStateException("Cannot get bean name; not set on MethodInvocation: " + mi); } return beanName; } /** * Create a new advisor that will expose the given bean name, * with no introduction * @param beanName bean name to expose */ public static Advisor createAdvisorWithoutIntroduction(String beanName) { return new DefaultPointcutAdvisor(new ExposeBeanNameInterceptor(beanName)); } /** * Create a new advisor that will expose the given bean name, introducing * the NamedBean interface to make the bean name accessible without forcing * the target object to be aware of this Spring IoC concept. * @param beanName the bean name to expose */ public static Advisor createAdvisorIntroducingNamedBean(String beanName) { return new DefaultIntroductionAdvisor(new ExposeBeanNameIntroduction(beanName)); } /** * Interceptor that exposes the specified bean name as invocation attribute. */ private static class ExposeBeanNameInterceptor implements MethodInterceptor { private final String beanName; public ExposeBeanNameInterceptor(String beanName) { this.beanName = beanName; } public Object invoke(MethodInvocation mi) throws Throwable { if (!(mi instanceof ProxyMethodInvocation)) { throw new IllegalStateException("MethodInvocation is not a Spring ProxyMethodInvocation: " + mi); } ProxyMethodInvocation pmi = (ProxyMethodInvocation) mi; pmi.setUserAttribute(BEAN_NAME_ATTRIBUTE, beanName); return mi.proceed(); } } /** * Introduction that exposes the specified bean name as invocation attribute. */ private static class ExposeBeanNameIntroduction extends DelegatingIntroductionInterceptor implements NamedBean { private final String beanName; public ExposeBeanNameIntroduction(String beanName) { this.beanName = beanName; } public Object invoke(MethodInvocation mi) throws Throwable { if (!(mi instanceof ProxyMethodInvocation)) { throw new IllegalStateException("MethodInvocation is not a Spring ProxyMethodInvocation: " + mi); } ProxyMethodInvocation pmi = (ProxyMethodInvocation) mi; pmi.setUserAttribute(BEAN_NAME_ATTRIBUTE, beanName); return super.invoke(mi); } public String getBeanName() { return this.beanName; } } } Other Spring Framework examples (source code examples)Here is a short list of links related to this Spring Framework ExposeBeanNameAdvisors.java source code file: |
... this post is sponsored by my books ... | |
#1 New Release! |
FP Best Seller |
Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.