Re: [aspectj-dev] perJoinPoint

[Ramnivas Laddad <ramnivas@xxxxxxxxxxxxxxx>]

I too have come across the same need. In my case, I wanted to store 
profile information per-join point (static part).
While using hashmaps works, it is inefficient in many situations.

A form of per-association will work (and JBoss AOP has such aspect 
association)
Actually, there may be need for two kinds of associations: 
perJoinPointStaticPart and perJoinPoint.
While these new  aspect associations might work, I have a simpler 
proposal to address the need.
I will like to add the following APIs:

   void JoinPoint.StaticPart.setUserObject(Object)
   Object JoinPoint.StaticPart.getUserObject()

And, for symmetry,

   void JoinPoint.setUserObject(Object)
   Object JoinPoint.getUserObject()

Then I will be able to store profile information as follows:

Object around() : profiled() {
   long startTime = getTime();
   Object ret = proceed();
   long endTime = getTime();

   ProfileInfo jpStats = 
(ProfileInfo)thisJoinPointStaticPart.getUserObject();
   if(jpStats == null) {
       thisJoinPointStaticPart.setUserObject(new ProfileInfo());
   }
   jpStats.record(endTime-startTime);
}

Just submitted an enhancement request:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=89009

-Ramnivas

Eric Bodden wrote:

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> No, this is not easily possible at the moment (see the perobjects
> discussion we had earlier). One workaround would be to store the
> joinpoint-specifc state in a hashmap. I think you can even use an
> identity hashmap, since joinpoints are pooled IIRC.
>
> Of course for large problems you might accumulate quite a lot of
> state over the runtime. But this is more a general problem rather
> than specific to AspectJ.
>
> Eric
>
> - --
> Eric Bodden
> Chair I2 for Programming Languages and Program Analysis
> RWTH Aachen University
>
>
>
> ________________________________
>
> From: aspectj-dev-admin@xxxxxxxxxxx
> [mailto:aspectj-dev-admin@xxxxxxxxxxx] On Behalf Of Tavoda Pavel
> Sent: Donnerstag, 24. März 2005 11:58
> To: aspectj-dev@xxxxxxxxxxx
> Subject: [aspectj-dev] perJoinPoint
>
>
> Is it possible to achieve something like perJoinPoint aspect?
> I would like to calculate some statistics for method execution.
>
> TNX
>
> Pavel
>
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