Re: [aspectj-users] problem retreiving from chain

[Andy Clement <andrew.clement@xxxxxxxxx>]

that is a brain bender...

Can you supply a test driver and the shape of Context, and I'll apply
some more thinking.  I do wonder if there is a simpler way to achieve
what you want.

Andy

2009/5/20 maverick_blr <naveenkumarmv@xxxxxxxxx>:
>
>
> I am trying to solve the following problem with aspectj and have run into a
> problem. Any help in fixing this will be highly appreciated.
>
> I have call stack in which one or more objects in the call chain implement
> an interface called IEnhancer
>
> public interface IEnhancer
> {
>        public Context getFromCallStack();
>        public Context getContext();
> }
>
> I need advice(s) to overwrite the getFromCallStack to fetch the context from
> the previous IEnhancer in the call stack.
>
> the getContext method is meant to retreive the Context from getFromCallStack
> and enhance it.
>
> for Example
>
> public Class MyEnhancer implements IEnhancer
> {
>        public Context getFromCallStack()
>        {
>                return null;
>                //will be overwritten by advice.
>        }
>
>        public Context getContext()
>        {
>                Context context = getFromCallStack();
>                context.enhance(value);
>        }
> }
>
> I want the around advice to retreive context from the previous enhancer and
> NOT the same object.
>
>
> I have written the following code.
>
> pointcut contextWormHoleEnhancerPointCut(IEnhancer enhancer)
> :execution(* IEnhancer+.*(..)) && this(enhancer);
>
> pointcut contextWormHoleEnhancerReadPointCut(IEnhancer enhancer)
> :execution(public * IEnhancer +.getFromCallStack(..))
>         && this(enhancer);
>
>
> pointcut ContextEnhancerToEnhancer(IEnhancer interim, IEnhancer reader)
> :if(interim != reader)&& cflow(contextWormHoleEnhancerPointCut(interim))&&
> contextWormHoleEnhancerReadPointCut(reader);
>
>
> Context around(IEnhancer interim,IEnhancer reader):IEnhancer(interim,
> reader){
>                return interim.getContext();
> };
>
> with the if pointcut in the ContextEnhancerToEnhancer point the around
> advice is not getting kicked in. If i exclude it the getFromCallStack is
> being invoked on this and it returns null.
>
>
> --
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>
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