近，二狗子入职了新公司，新入职的那几天确实有点飘。不过慢慢的，他发现他身边的人各个身怀绝技啊，有Spring源码的贡献者，有Dubbo源码的贡献者，有MyBatis源码的贡献者，还有研究AI的大佬，个个都是大神级别的人物。二狗子有点慌，想起自己虽然入职了，但是比起其他人确实差点远啊。怎么办呢？先从基础补起呗，他发现自己对于Spring的理解还不算太深。于是乎，他让我给他讲讲Spring的@EnableAspectJAutoProxy注解。
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@EnableAspectJAutoProxy注解 在配置类上添加@EnableAspectJAutoProxy注解，能够开启注解版的AOP功能。也就是说，AOP中如果要使注解版的AOP功能起作用，就需要在配置类上添加@EnableAspectJAutoProxy注解。 我们先来看下@EnableAspectJAutoProxy注解的源码，如下所示。
package org.springframework.context.annotation; import java.lang.annotation.Documented; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Import(AspectJAutoProxyRegistrar.class) public @interface EnableAspectJAutoProxy { boolean proxyTargetClass() default false; boolean exposeProxy() default false; } 从源码可以看出，@EnableAspectJAutoProxy使用@Import注解引入了AspectJAutoProxyRegister.class对象 。那么，AspectJAutoProxyRegistrar又是什么呢？我们继续点击到AspectJAutoProxyRegistrar类的源码中，如下所示。
package org.springframework.context.annotation; import org.springframework.aop.config.AopConfigUtils; import org.springframework.beans.factory.support.BeanDefinitionRegistry; import org.springframework.core.annotation.AnnotationAttributes; import org.springframework.core.type.AnnotationMetadata; class AspectJAutoProxyRegistrar implements ImportBeanDefinitionRegistrar { @Override public void registerBeanDefinitions( AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
AopConfigUtils.registerAspectJAnnotationAutoProxyCreatorIfNecessary(registry); AnnotationAttributes enableAspectJAutoProxy = AnnotationConfigUtils.attributesFor(importingClassMetadata, EnableAspectJAutoProxy.class); if (enableAspectJAutoProxy != null) { if (enableAspectJAutoProxy.getBoolean("proxyTargetClass")) { AopConfigUtils.forceAutoProxyCreatorToUseClassProxying(registry); } if (enableAspectJAutoProxy.getBoolean("exposeProxy")) { AopConfigUtils.forceAutoProxyCreatorToExposeProxy(registry); } } }} 可以看到AspectJAutoProxyRegistrar类实现了ImportBeanDefinitionRegistrar接口。看下ImportBeanDefinitionRegistrar接口的定义，如下所示。
package org.springframework.context.annotation;
import org.springframework.beans.factory.support.BeanDefinitionRegistry; import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor; import org.springframework.beans.factory.support.BeanNameGenerator; import org.springframework.core.type.AnnotationMetadata; public interface ImportBeanDefinitionRegistrar {
default void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry, BeanNameGenerator importBeanNameGenerator) { registerBeanDefinitions(importingClassMetadata, registry); } default void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) { }看到ImportBeanDefinitionRegistrar接口，小伙伴们是不是觉得很熟悉呢。没错，我们在【Spring注解驱动开发】专题前面的文章中介绍过。可以通过ImportBeanDefinitionRegistrar接口实现将自定义的组件添加到IOC容器中。
也就说，@EnableAspectJAutoProxy注解使用AspectJAutoProxyRegistrar对象自定义组件，并将相应的组件添加到IOC容器中。
调试Spring源码 我们在AspectJAutoProxyRegistrar类的registerBeanDefinitions()方法中设置断点，如下所示。
接下来，我们以debug的方法来运行AopTest类的testAop01()方法。运行后程序进入到断点位置，如下所示。
可以看到，程序已经暂停在断点位置，而且在IDEA的左下角显示了方法的调用栈。
在AspectJAutoProxyRegistrar类的registerBeanDefinitions()方法，首先调用AopConfigUtils类的registerAspectJAnnotationAutoProxyCreatorIfNecessary()方法来注册registry。单看registerAspectJAnnotationAutoProxyCreatorIfNecessary()方法也不难理解，字面含义就是：如果需要的话注册一个AspectJAnnotationAutoProxyCreator。
接下来，我们进入到AopConfigUtils类的registerAspectJAnnotationAutoProxyCreatorIfNecessary()方法中，如下所示。
在AopConfigUtils类的registerAspectJAnnotationAutoProxyCreatorIfNecessary()方法中，直接调用了重载的registerAspectJAnnotationAutoProxyCreatorIfNecessary()方法，我们继续跟代码，如下所示。
可以看到在重载的registerAspectJAnnotationAutoProxyCreatorIfNecessary()方法中直接调用了registerOrEscalateApcAsRequired()方法。在registerOrEscalateApcAsRequired()方法中，传入了AnnotationAwareAspectJAutoProxyCreator.class对象。
我们继续跟进代码，如下所示。
我们可以看到，在registerOrEscalateApcAsRequired()方法中，接收到的Class对象的类型为：org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator。
在registerOrEscalateApcAsRequired()方法中方法中，首先判断registry是否包含org.springframework.aop.config.internalAutoProxyCreator类型的bean。如下所示。
如果registry中包含org.springframework.aop.config.internalAutoProxyCreator类型的bean，则进行相应的处理，从Spring的源码来看，就是将org.springframework.aop.config.internalAutoProxyCreator类型的bean从registry中取出，并且判断cls对象的name值和apcDefinition的beanClassName值是否相等，如果不相等。则获取apcDefinition和cls的优先级，如果apcDefinition的优先级小于cls的优先级，则将apcDefinition的beanClassName设置为cls的name值。相对来说，理解起来还是比较简单的。
我们这里是第一次运行程序，不会进入到 if 条件中，我们继续看代码，如下所示。
这里，使用RootBeanDefinition来创建一个beanDefinition，并且将org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator的Class对象作为参数传递进来。
我们继续往下看代码，最终AopConfigUtils类的registerOrEscalateApcAsRequired()方法中，会通过registry调用registerBeanDefinition()方法注册组件，如下所示。
并且注册的bean的名称为org.springframework.aop.config.internalAutoProxyCreator。
接下来，我们继续看AspectJAutoProxyRegistrar类的registerBeanDefinitions()源码，如下所示。
通过AnnotationConfigUtils类的attributesFor方法来获取@EnableAspectJAutoProxy注解的信息。接下来，就是判断proxyTargetClass属性的值是否为true，如果为true则调用AopConfigUtils类的forceAutoProxyCreatorToUseClassProxying()方法；继续判断exposeProxy属性的值是否为true，如果为true则调用AopConfigUtils类的forceAutoProxyCreatorToExposeProxy()方法。
综上，向Spring的配置类上添加@EnableAspectJAutoProxy注解后，会向IOC容器中注册AnnotationAwareAspectJAutoProxyCreator。
接下来，我们来看下AnnotationAwareAspectJAutoProxyCreator类的结构图。 http://bbs.quyouji.com/topic.asp?id=1090 http://bbs.quyouji.com/topic.asp?id=1091 http://bbs.quyouji.com/topic.asp?id=1092 http://bbs.quyouji.com/topic.asp?id=1093 http://bbs.quyouji.com/topic.asp?id=1094 http://bbs.quyouji.com/topic.asp?id=1095 http://bbs.quyouji.com/topic.asp?id=1096 http://bbs.quyouji.com/topic.asp?id=1097 http://bbs.quyouji.com/topic.asp?id=1098 http://bbs.quyouji.com/topic.asp?id=1099 http://bbs.quyouji.com/topic.asp?id=1100 http://bbs.quyouji.com/topic.asp?id=1101 http://bbs.quyouji.com/topic.asp?id=1102 http://bbs.quyouji.com/topic.asp?id=1103 http://bbs.quyouji.com/topic.asp?id=1104 http://bbs.quyouji.com/topic.asp?id=1105 http://bbs.quyouji.com/topic.asp?id=1106 http://bbs.quyouji.com/topic.asp?id=1107 http://bbs.quyouji.com/topic.asp?id=1108 http://bbs.quyouji.com/topic.asp?id=1109 http://bbs.quyouji.com/topic.asp?id=1110 http://bbs.quyouji.com/topic.asp?id=1111 http://bbs.quyouji.com/topic.asp?id=1112 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我们简单梳理下AnnotationAwareAspectJAutoProxyCreato类的核心继承关系，如下所示。
AnnotationAwareAspectJAutoProxyCreator –AspectJAwareAdvisorAutoProxyCreator –AbstractAdvisorAutoProxyCreator –AbstractAutoProxyCreator – ProxyProcessorSupport， SmartInstantiationAwareBeanPostProcessor 查看继承关系可以发现，此类实现了Aware与BeanPostProcessor接口，这两个接口都和Spring bean的初始化有关，由此推测此类主要处理方法都来自这两个接口的实现方法。同时该类也实现了order方法。
好了，二狗子说：有关AnnotationAwareAspectJAutoProxyCreator类的详细代码和执行流程我们后面再讲，他有点消化不了了。
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