[aosd-discuss] excluding a joinpoint shadow

[Eric Bodden]

Hi, Peter.

There is currently no way to do this in AspectJ. People have been
thinking about annotations which one could put on statements or
blocks. This might become a Java Specification Request at some point,
who knows...

But there is another potential solution for your problem, called
tracematches. A tracematch allows you to match on sequences of events
and hence to express things like "only match the n-th method call".

An efficient implementation of tracematches is available in the abc
compiler. You find an introductory paper at:

http://abc.comlab.ox.ac.uk/techreports#abc-2005-1

Hope that helps,
Eric

P.S. Such kinds of questions should rather go to the aspectj-users
list. aosd-discuss is more for general discussion on AOSD.


On 2/26/07, Peter Kim <chpkim at gmail.com> wrote:
> Hi,
>
> What is the best way to go about allowing a particular joinpoint
> shadow (e.g. AST node) to be excluded from being advised?  For
> example, if I have an aspect that advises call(* *.bar()), to exclude
> calls to bar() within operation, I would modify the pointcut to "&&
> !withincode(operation())".  However, I would like to allow the user to
> exclude only the first call to bar() through some comment-annotation
> mechanism as follows:
>
> void operation()
> {
>    foo();
>    bar();
>    //@exclude
>    bar();
> }
>
> I understand that this probably requires some modification to AspectJ
> infastructure, but I'm not very familiar with the infrastructure and I
> would like to know the fastest way to achieve this (though not too
> dirty)...thank you so much!
>
>
> --
> Peter Kim
> Ph.D. Candidate
> Generative Programming Lab
> Department of Electrical and Computer Engineering
> University of Waterloo, Canada
>
> http://swen.uwaterloo.ca/~chpkim
> Tel: +1-519-635-2468
> Office: DC2544
>
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-- 
Eric Bodden
Sable Research Group
McGill University, Montréal, Canada