Spring AOP-未调用点剪切

Question

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Track {

}

我没有错过我的包的@Configuration类中的@EnableAspectJAutoProxy。

我在下面的方面中定义了一个切入点和一个建议：

@Aspect
@Component
public class MyAspect {

@Pointcut("execution(@Track * *.*(..))")
void annotatedMethod() {
    // No Implementation required
}

@Around("annotatedMethod() && @annotation(methodLevelTrack)")
public void adviseAnnotatedMethods(ProceedingJoinPoint proceedingJoinPoint,
        Track methodLevelTrack) throws Throwable {

     // do some task
    proceedingJoinPoint.proceed();
    // do some task after the method is executed.
  }
}

我的意图是：对于任何包中的任何方法（用@track注释）、任何访问修饰符、任何数量的输入参数和任何返回类型，都要遵循方面的@around建议。

public class Engine {
  // bunch of other autowired objects

 public void processTask() {
   <autowired_object_A>.someMethod() // this method has been annotated with @Track
   <autowired_object_B>.someMethod() // this method has also been annotated with @ Track
   .... // bunch of other methods in other autowired objects that have been annotated with @ Track

   someMethodOfEngineClass(); // Now this has been defined in the Engine class as below, but pointcut doesn't recognize this method!

 }

 @Track
 private void someMethodOfEngineClass() {
  // do something
 }
}

Answer 1

当您定义aop时，spring会在类周围创建proxy，所以当调用方法时，实际上call会委托给proxy，类似于

your.package.Engine$$FastClassBySpringCGLIB$$c82923b4.someMethodOfEngineClass()

但这仅在从类外部调用方法时有效，如果从同一个类调用class method，则实际上是通过this.SomeMethodoFengineClass()调用它

在这里->http://www.nurkiewicz.com/2011/10/spring-pitfalls-proxying.html您可以找到更多关于代理的信息