Spring---AspectJ与Spring

/**
     *  【代理对象创建】
     *
     *      实现思路：BeanPostProcessor#postProcessAfterInitialization
     *
     *      org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#initializeBean
     *
     *      ->
     *
     *      org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#applyBeanPostProcessorsAfterInitialization
     *
     *      ->
     *
     *      org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator#postProcessAfterInitialization{
     *
     *          public Object postProcessAfterInitialization(@Nullable Object bean, String beanName) {
     *              ...
     *              return wrapIfNecessary(bean, beanName, cacheKey);
     *              ...
     *          }
     *
     *          protected Object wrapIfNecessary(Object bean, String beanName, Object cacheKey) {
     *              ...
     *              Object proxy = createProxy(bean.getClass(), beanName, specificInterceptors, new SingletonTargetSource(bean));
     *              ...
     *          }
     *
     *          protected Object createProxy(Class<?> beanClass, @Nullable String beanName, @Nullable Object[] specificInterceptors, TargetSource targetSource) {
     *              ...
     *              ProxyFactory proxyFactory = new ProxyFactory();
     *              ...
     *              return proxyFactory.getProxy(getProxyClassLoader());
     *          }
     *      }
     *
     *
     *      BeanPostProcessor : org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator
     *
     *
     *
     */

》》》》》》执行链路《《《《《《

代理Bean方法调用 -> advice被执行 -> 目标Bean方法调用 -> 增强结束

@Controller
@ResponseBody
public class MyController{
   @Autowired
    private AspectJServiceImpl aspectJService;

    @GetMapping(value = "testAspectJ/{s}")
    public void testAspectJ(@PathVariable(value = "s") String s){
        aspectJService.testAspectJ(new User());
    }    
}


@Service
public class AspectJServiceImpl{
  public void testAspectJ(User s) {

        String name = this.getClass().getName();

    }
}


@Component
@Aspect
public class MyAspect {
    @Around("execution(public void com.an.service.impl.AspectJServiceImpl.testAspectJ(com.an.entity.User))")
    public Object testAspectJ(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {

        Object[] args = proceedingJoinPoint.getArgs();

        return proceedingJoinPoint.proceed(args);
    }
}

生成的class

public class AspectJServiceImpl$$EnhancerBySpringCGLIB$$26f80466 extends AspectJServiceImpl implements SpringProxy, Advised, Factory {
  private boolean CGLIB$BOUND;

    private MethodInterceptor CGLIB$CALLBACK_0;
    private MethodInterceptor CGLIB$CALLBACK_1;
    private NoOp CGLIB$CALLBACK_2;
    private Dispatcher CGLIB$CALLBACK_3;
    private Dispatcher CGLIB$CALLBACK_4;
    private MethodInterceptor CGLIB$CALLBACK_5;
    private MethodInterceptor CGLIB$CALLBACK_6;
    ...
    
    public final void testAspectJ(User var1) {
        MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
        if (var10000 == null) {
            CGLIB$BIND_CALLBACKS(this);
            var10000 = this.CGLIB$CALLBACK_0;
        }

        if (var10000 != null) {
            var10000.intercept(this, CGLIB$testAspectJ$1$Method, new Object[]{var1}, CGLIB$testAspectJ$1$Proxy);
        } else {
            super.testAspectJ(var1);
        }
    }

    ...
}

Controller中从容器中取到的Bean为代理Bean

当执行Controller的aspectJService.testAspectJ，实际调用的是代理Bean的testAspectJ；

代理Bean的this.CGLIB$CALLBACK_0 是 org.springframework.aop.framework.CglibAopProxy的内部类org.springframework.aop.framework.CglibAopProxy.DynamicAdvisedInterceptor；

然后调用DynamicAdvisedInterceptor的intercept方法；

获取所有的advice，封装到CglibAopProxy内部类org.springframework.aop.framework.CglibAopProxy.CglibMethodInvocation；

然后调用CglibMethodInvocation的proceed方法；

CglibMethodInvocation的proceed方法调用父类org.springframework.aop.framework.ReflectiveMethodInvocation的proceed方法

获取第一个advice org.springframework.aop.interceptor.ExposeInvocationInterceptor

然后调用org.springframework.aop.interceptor.ExposeInvocationInterceptor的invoke方法

org.springframework.aop.interceptor.ExposeInvocationInterceptor的invoke方法回调了org.springframework.aop.framework.CglibAopProxy.CglibMethodInvocation的proceed方法