《AspectJ Cookbook》读书笔记六: 捕获通知上的连接点

一. 捕获何时执行通知
        使用adviceexecution()切入点。adviceexecution()切入点的语法如下：
        pointcut <pointcut name>() : adviceexecution();

package  com.aspectj;

public  aspect AdviceExecutionRecipe 
{
   /**//*
       Specifies calling advice whenever advice is executed
   */
   pointcut adviceExecutionPointcut() : adviceexecution();

   // Advice declaration
   before() : adviceExecutionPointcut()
   {
      System.out.println(
         "------------------- Aspect Advice Logic --------------------");
      System.out.println("In the advice picked by ExecutionRecipe");
      System.out.println(
         "Signature: "
            + thisJoinPoint.getStaticPart().getSignature());
      System.out.println(
         "Source Line: "
            + thisJoinPoint.getStaticPart().getSourceLocation());
      System.out.println(
         "------------------------------------------------------------");
   }
}

二. 排出作为通知执行结果的连接点
三. 在发出通知时展示原始连接点
        添加JoinPoint标识符到切入点定义中。

package  com.aspectj;

import  org.aspectj.lang.JoinPoint;

public  aspect AdviceExecutionRecipe 
{
   /**//*
       Specifies calling advice whenever advice is executed
   */
   pointcut adviceExecutionPointcut(JoinPoint originalJoinPoint) : adviceexecution() && args(originalJoinPoint) && !within(AdviceExecutionRecipe);

   // Advice declaration
   before(JoinPoint originalJoinPoint) : adviceExecutionPointcut(originalJoinPoint)
   {
      System.out.println(
         "------------------- Aspect Advice Logic --------------------");
      System.out.println("In the advice picked by AdviceExecutionRecipe");
      System.out.println(
         "Signature: "
            + thisJoinPoint.getStaticPart().getSignature());
      System.out.println(
         "Source Line: "
            + thisJoinPoint.getStaticPart().getSourceLocation());
      
      System.out.println(
            "Advised Advice's Join Point Signature: "
               + originalJoinPoint.getSignature());
      
      System.out.println(
         "------------------------------------------------------------");
   }
}