spring AbstractAdvisingBeanPostProcessor 源码

  • 2022-08-08
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spring AbstractAdvisingBeanPostProcessor 代码


 * Copyright 2002-2021 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
 *      https://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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.springframework.aop.framework;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.springframework.aop.Advisor;
import org.springframework.aop.support.AopUtils;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.core.SmartClassLoader;
import org.springframework.lang.Nullable;

 * Base class for {@link BeanPostProcessor} implementations that apply a
 * Spring AOP {@link Advisor} to specific beans.
 * @author Juergen Hoeller
 * @since 3.2
public abstract class AbstractAdvisingBeanPostProcessor extends ProxyProcessorSupport implements BeanPostProcessor {

	protected Advisor advisor;

	protected boolean beforeExistingAdvisors = false;

	private final Map<Class<?>, Boolean> eligibleBeans = new ConcurrentHashMap<>(256);

	 * Set whether this post-processor's advisor is supposed to apply before
	 * existing advisors when encountering a pre-advised object.
	 * <p>Default is "false", applying the advisor after existing advisors, i.e.
	 * as close as possible to the target method. Switch this to "true" in order
	 * for this post-processor's advisor to wrap existing advisors as well.
	 * <p>Note: Check the concrete post-processor's javadoc whether it possibly
	 * changes this flag by default, depending on the nature of its advisor.
	public void setBeforeExistingAdvisors(boolean beforeExistingAdvisors) {
		this.beforeExistingAdvisors = beforeExistingAdvisors;

	public Object postProcessBeforeInitialization(Object bean, String beanName) {
		return bean;

	public Object postProcessAfterInitialization(Object bean, String beanName) {
		if (this.advisor == null || bean instanceof AopInfrastructureBean) {
			// Ignore AOP infrastructure such as scoped proxies.
			return bean;

		if (bean instanceof Advised advised) {
			if (!advised.isFrozen() && isEligible(AopUtils.getTargetClass(bean))) {
				// Add our local Advisor to the existing proxy's Advisor chain...
				if (this.beforeExistingAdvisors) {
					advised.addAdvisor(0, this.advisor);
				else {
				return bean;

		if (isEligible(bean, beanName)) {
			ProxyFactory proxyFactory = prepareProxyFactory(bean, beanName);
			if (!proxyFactory.isProxyTargetClass()) {
				evaluateProxyInterfaces(bean.getClass(), proxyFactory);

			// Use original ClassLoader if bean class not locally loaded in overriding class loader
			ClassLoader classLoader = getProxyClassLoader();
			if (classLoader instanceof SmartClassLoader && classLoader != bean.getClass().getClassLoader()) {
				classLoader = ((SmartClassLoader) classLoader).getOriginalClassLoader();
			return proxyFactory.getProxy(classLoader);

		// No proxy needed.
		return bean;

	 * Check whether the given bean is eligible for advising with this
	 * post-processor's {@link Advisor}.
	 * <p>Delegates to {@link #isEligible(Class)} for target class checking.
	 * Can be overridden e.g. to specifically exclude certain beans by name.
	 * <p>Note: Only called for regular bean instances but not for existing
	 * proxy instances which implement {@link Advised} and allow for adding
	 * the local {@link Advisor} to the existing proxy's {@link Advisor} chain.
	 * For the latter, {@link #isEligible(Class)} is being called directly,
	 * with the actual target class behind the existing proxy (as determined
	 * by {@link AopUtils#getTargetClass(Object)}).
	 * @param bean the bean instance
	 * @param beanName the name of the bean
	 * @see #isEligible(Class)
	protected boolean isEligible(Object bean, String beanName) {
		return isEligible(bean.getClass());

	 * Check whether the given class is eligible for advising with this
	 * post-processor's {@link Advisor}.
	 * <p>Implements caching of {@code canApply} results per bean target class.
	 * @param targetClass the class to check against
	 * @see AopUtils#canApply(Advisor, Class)
	protected boolean isEligible(Class<?> targetClass) {
		Boolean eligible = this.eligibleBeans.get(targetClass);
		if (eligible != null) {
			return eligible;
		if (this.advisor == null) {
			return false;
		eligible = AopUtils.canApply(this.advisor, targetClass);
		this.eligibleBeans.put(targetClass, eligible);
		return eligible;

	 * Prepare a {@link ProxyFactory} for the given bean.
	 * <p>Subclasses may customize the handling of the target instance and in
	 * particular the exposure of the target class. The default introspection
	 * of interfaces for non-target-class proxies and the configured advisor
	 * will be applied afterwards; {@link #customizeProxyFactory} allows for
	 * late customizations of those parts right before proxy creation.
	 * @param bean the bean instance to create a proxy for
	 * @param beanName the corresponding bean name
	 * @return the ProxyFactory, initialized with this processor's
	 * {@link ProxyConfig} settings and the specified bean
	 * @since 4.2.3
	 * @see #customizeProxyFactory
	protected ProxyFactory prepareProxyFactory(Object bean, String beanName) {
		ProxyFactory proxyFactory = new ProxyFactory();
		return proxyFactory;

	 * Subclasses may choose to implement this: for example,
	 * to change the interfaces exposed.
	 * <p>The default implementation is empty.
	 * @param proxyFactory the ProxyFactory that is already configured with
	 * target, advisor and interfaces and will be used to create the proxy
	 * immediately after this method returns
	 * @since 4.2.3
	 * @see #prepareProxyFactory
	protected void customizeProxyFactory(ProxyFactory proxyFactory) {



spring 源码目录


spring AbstractSingletonProxyFactoryBean 源码

spring Advised 源码

spring AdvisedSupport 源码

spring AdvisedSupportListener 源码

spring AdvisorChainFactory 源码

spring AopConfigException 源码

spring AopContext 源码

spring AopInfrastructureBean 源码

spring AopProxy 源码

spring AopProxyFactory 源码

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