Re: [aspectj-users] Capturing multiple return values from recursive cal

[Dinkar Rao <dinkar.d91411118@xxxxxxxxx>]

Hi Jean-Louis,

With an execution pointcut, the output is the same as for a call pointcut.

Still, I don't follow the significance. Execution or call, I need to
be able to (somehow) expose return values from the top 2 recursive
calls on the stack, in the invocation of some advice.

Thanks,
Dinkar


On Wed, Sep 2, 2009 at 1:55 AM, <jeanlouis.pasturel@xxxxxxxxxxxxxxxxxx> wrote:
>
> What happens with an execution pointcut instead of a call pointcut ?
>
>
> Jean-Louis Pasturel
>
> -----Message d'origine-----
> De : aspectj-users-bounces@xxxxxxxxxxx
> [mailto:aspectj-users-bounces@xxxxxxxxxxx] De la part de Dinkar Rao
> Envoyé : mercredi 2 septembre 2009 10:21
> À : aspectj-users@xxxxxxxxxxx
> Objet : [aspectj-users] Capturing multiple return values from recursive
> calls
>
>
> Hi Folks,
>
> Need some help with AspectJ. How can I capture return values from recursive
> calls ? I want not only the returned value from the top level method call in
> the stack, but also link the values from the intermediate method calls. For
> example, given this simple method:
>
>    public int fact(int val) {
>        if (val > 0) {
>            return val * fact(val - 1);
>        }
>        else {
>            return 1;
>        }
>    }
>
> I can write an aspect that gets me the returned values from each call.
>
>    public pointcut FactCall() :
>        call(public int fact(int));
>
>    after() returning(int f) :
>        FactCall() {
>            System.out.println("returned = " + f);
>        }
>
>  So for fact(4), I get the returned values from the top-level call as 1, 1,
> 2, 6, 24.
>
> But what I really want to do is to capture the return values from the top 2
> (or top n) recursive method calls, i.e. something that links
>
> 1 => 1
> 1 => 2
> 2 => 6
> 6 => 24
>
> Any suggestions on how to do this ?
>
> Thanks,
> Dinkar
>
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> tp25253444p25253444.html
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