使用Aspectj剖析所选方法 [英] Use aspectj to profile selected methods

问题描述

我想用AspectJ来描述一个库.我的计划是用注释标记需要剖析的方法:

I'd like to use aspectj to profile a library. My plan was to mark methods that require profiling with an annotation:

@Profiled("logicalUnitOfWork")

然后有一个方面可以在使用logicalUnitOfWork突出显示配置文件内容的方法之前和之后触发.

And then have an aspect that would fire before and after methods that would use the logicalUnitOfWork to highlight the profiled content.

所以，我的切入点看起来像这样.请注意，我这里没有注释的参数.这是我不确定如何做的事情之一:

So, my pointcut to start with looks like this. Note that I don't have the argument for the annotation here; that's one of the things I'm not sure how to do:

pointcut profiled() : execution(@Profiled * *());

before() : profiled () {
    // : the profiled logical name is in this variable:
String logicalEventType;
Profiler.startEvent (logicalEventType);
}

after() returning : profiled() {
    // : the profiled logical name is in this variable:
String logicalEventType;
    Profiler.endEvent (logicalEventType);
}

正在分析的方法将这样定义:

The methods being profiled would be defined like this:

@Profiled("someAction")
public void doAction (args...) {}

简而言之，如何将@Profiled批注的值添加到方面中?我不需要根据值来限制进行哪个概要分析，我只需要对建议可见即可.另外，是否需要将注释的保留时间设置为运行时才能起作用，还是可以将类级别的保留时间改为?

In short, how can I get the value of the @Profiled annotation into the aspect? I don't need to restrict which profiling occurs based on the value, I just need it to be visible to the advice. Also, do I need to have the annotation's retention set to runtime for this to work, or can I have class-level retention instead?

推荐答案

我不确定这是否是最好的方法，但是您可以尝试以下方法:

I am not sure if this is the best way to do it, but you could try something like:

   pointcut profiledOperation(Profiled p) : 
      execution(@Profiled * *()) && @annotation(p);

   before(Profiled p): profiledOperation(p)
   {
      System.out.println("Before " + p.value());
   }

   after(Profiled p): profiledOperation(p)
   {
      System.out.println("After " + p.value());
   }

由于您需要在运行时访问批注值，因此必须将@Retention设置为RUNTIME.

Since you need to access the annotation value at runtime you will have to set the @Retention to RUNTIME.

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