Re: [aspectj-users] AspectJ and complex system

["Eric Bodden" <eric.bodden@xxxxxxxxxxxxxx>]

Right, what Dehua proposed allows you to instantiate an aspect per
executing, called, ... etc. object. If you need more flexibility, you
might want to consider instead using Relational Aspects, as
implemented in the AspectBench Compiler (http://tinyurl.com/33p7dm) or
CaesarJ (http://caesarj.org/). Both allow for a more flexible
instantiation model.

With a relational aspect, you could for example write:

MyAspect.associate(myEntity, myComponent1);
MyAspect.associate(myEntity, myComponent2);

This would then declare that both, myComponent1 and myComponent2 are a
subcomponent of myEntity. You aspect could then look at follows:

relational aspect MyAspect(Entity e, Component c) {
    String perRelationship;
    relational after(): call(* *(..)) && target(c) {
        System.out.println(c+" is part of entity "+e);
    }
}

In this aspect, the relational advice is only executed if a method is
called on a component that has been associated with the aspect, i.e.
if anything is called on myComponent1 or myComponent2. In the advice
body, you further have direct access to any enclosing entity, i.e. e
will here be bound to myEntity. Further, the field "perRelationship"
exists *for each* entity/component pair and hence allows you to store
per-relationship state (those semantics hold for any non-static field
in a relational aspect).

If you are interested in this technology, please drop me a line and I
can email you our latest version.

Eric

On 03/11/2007, Dehua Zhang <dehua.zhang@xxxxxxxxxxxxxx> wrote:
>
> have a look at
> http://www.eclipse.org/aspectj/doc/released/progguide/quick-aspectAssociations.html
>
> --
> Dehua (Andy) Zhang
> Sable Research Group, McGill University
> Montréal, Québec, Canada
> http://www.cs.mcgill.ca/~dzhang25
>
>
>
>
>
> -----Original Message-----
> From: aspectj-users-bounces@xxxxxxxxxxx on behalf of Mahamadou BELEM
> Sent: Sat 11/3/2007 05:53
> To: aspectj-users@xxxxxxxxxxx
> Subject: [aspectj-users] AspectJ and complex system
>
> Dear alll
>
> I am new in Aspect Technology and I need ome help.
>
> I plan to use AspectJ for a complex system development. I want to be sure
> that AspectJ
> allows solving my problem.
> There is my problem:
> I have a system composed of some entities. Let call them Entity.
>
> Each Entity is a compound object composed of a second type of components.
> Let
> call them Component. Each component instance is closed to an Entity
> instance.
>
> I want to implement some Aspects that will control the behaviour of my
> components.  Let call them Aspect.
>
> But I want that each instance of Entity instantiates the Aspect class. The
> components of this entity behaviour will be controlled only by this Aspect
> instance.  Then, the components of an entity can share the same instance of
> Aspect but two entities cannot share a same instance of aspect.
>
> does AspectJ allow this specification?
>
> Please I need your help.
>
> Best regards
>
> _______________________________________________
> aspectj-users mailing list
> aspectj-users@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/aspectj-users
>


-- 
Eric Bodden
Sable Research Group
McGill University, Montréal, Canada