Re: [aspectj-users] Fwd: trigger all calls/sets from an annotated parame

[Andy Clement <andrew.clement@xxxxxxxxx>]

Hi,

I'm afraid you can't do that (easily) - we don't know/preserve enough
about local variables.  The slightly messy way to do it would be:

At the execution joinpoint for the method, remember which parameter
objects are annotated, some kind of sequence of these (for different
arg positions):
before(B b): execution(* *(@MyAnno (*),..)) && args(b) // arg in first
position
before(B b): execution(* *(*,@MyAnno (*),..)) && args(b) // arg in
second position
remember 'b'

Then, when call/set is made within that code, look at the object upon
which the method is being called (target) and check if it was an
annotated one.
before(B b):  (call(* *(..)) || set(* *)) && target(b) {
  if (b is in my list) {
    System.out.println("triggered");
  }
}

Using some kind of stack to push (on entry)/pop (on exit) the
contextual information you are keeping about the method.

cheers,
Andy

On 21 May 2012 08:50, Frederick Egli <frederick.egli@xxxxxxxxx> wrote:
> Hi all,
>
> I'm trying to trigger all calls/sets from an annotated parameter within a
> method. Consider the following example:
>
> public class A {
>
>     public void foo(@MyAnno B b1, B b2){
>         b1.bar();         //this should trigger
>         b1.field = 42;  //this should trigger
>
>         b2.bar();         //should not trigger
>         b2.field = 42;  //should not trigger
>     }
> }
>
> public class B {
>     public int field;
>     public void bar() {    }
> }
>
> @Retention(RetentionPolicy.RUNTIME)
> @Target(ElementType.PARAMETER)
> public @interface MyAnno {
> }
>
>
> So far I have the following aspect. But of course this triggers all calls
> and sets from all method parameters.
>
> @Aspect
> public class MyAspect {
>     @Before("cflowbelow(execution(* *.*(..,@MyAnno (*),..))) && (call(*
> *(..)) || set(* *)) && !within(MyAspect)")
>     public void belowAdvice() {
>         System.out.println("triggered");
>     }
> }
>
> Is there any way to only trigger the calls and sets from the annotated (in
> my case b1) parameter within a method (foo())?
>
>
> Thanks in advance!
>
> Fred
>
>
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