Spring AOP 是如何实现的？

阳光穿透心脏的1/2处 2023-01-15 03:52 127阅读 0赞

首先，Spring AOP 有一些特性：

1.  纯 Java 实现，无编译时特殊处理、不修改和控制 ClassLoader
2.  仅支持方法级别的 Joint Points
3.  非完整的 AOP 框架
4.  与 IoC 进行了整合
5.  与 AspectJ 的注解进行了整合

使用层面，有三种编程模型：

1.  <aop: 开头的 xml 配置。
    
    • 激活 AspectJ 自动代理：<aop:aspectj-autoproxy/>
    
    • 配置：<aop:config/>
    
    • Aspect： <aop:aspect/>
    
    • Pointcut：<aop:pointcut/>
    
    • Advice：<aop:around/>、<aop:before/>、<aop:after-returning/>、<aop:after-throwing/> 和 <aop:after/>
    
    • Introduction：<aop:declare-parents/>
    
    • 代理 Scope：<aop:scoped-proxy/>
2.  注解驱动
    
    • 激活 AspectJ 自动代理：@EnableAspectJAutoProxy
    
    • Aspect：@Aspect
    
    • Pointcut：@Pointcut
    
    • Advice：@Before、@AfterReturning、@AfterThrowing、@After、@Around
    
    • Introduction：@DeclareParents
3.  JDK 动态代理、CGLIB 以及 AspectJ 实现的 API
    
    • 代理：AopProxy
    
    • 配置：ProxyConfig
    
    • Join Point：JoinPoint
    
    • Pointcut：Pointcut
    
    • Advice：Advice、BeforeAdvice、AfterAdvice、AfterReturningAdvice、 ThrowsAdvice

核心实现类：

*  AOP 代理对象：AopProxy、JdkDynamicAopProxy、CglibAopProxy
 *  AOP 代理对象工厂：AopProxyFactory、DefaultAopProxyFactory
 *  AOP 代理配置：ProxyConfig
 *  Advisor：PointcutAdvisor、IntroductionAdvisor
 *  Advice：Interceptor、BeforeAdvice、AfterAdvice及子类
 *  Pointcut：StaticMethodMatcher
 *  JoinPoint：Invocation
 *  Advisor 适配器：AdvisorAdapter、AdvisorAdapterRegistry
 *  AdvisorChainFactory
 *  AbstractAutoProxyCreator：BeanNameAutoProxyCreator、DefaultAdvisorAutoProxyCreator、AnnotationAwareAspectAutoProxyCreator
 *  IntroductionInfo
 *  代理目标对象来源：TargetSource

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