Re: [aspectj-users] perthis Question

[Ramnivas Laddad <ramnivas@xxxxxxxxx>]

Neil,

For logging creation of new instances, you do not need 
perthis aspect. You need it only to associate the 
aspect's state with associated objects.

In your case, you do not need (although it will work) 
inner aspect either (although other design consideration 
may favor use of an inner aspect).

-Ramnivas

--- neil loughran <n.loughran@xxxxxxxxxxxxxxx> wrote:
> Thanks again Ramnivas,
> 
> I'm not sure thats exacly what I need as I think it gives an aspect
> instance for each C.new call..
> 
> I suddenly had a flash of inspiration and remembered the Inner Aspect
> 
>  static aspect Inner {
>  
>  after() : call (C.new())
>   {
>   System.out.println("new C ");
>   }
>   }
> 
> And this appears to work as I'd like. :-)
> 
> Cheers
> Neil
> 
> 
> ----- Original Message ----- 
> From: "Ramnivas Laddad" <ramnivas@xxxxxxxxx>
> To: <aspectj-users@xxxxxxxxxxx>
> Sent: Monday, September 08, 2003 3:51 PM
> Subject: Re: [aspectj-users] perthis Question
> 
> 
> > Change your aspect declaration as follows:
> > 
> > aspect MyAspect perthis (execution(Foo.new()) ||
> execution(C.new(..))
> > 
> > -Ramnivas
> > 
> > --- neil loughran <n.loughran@xxxxxxxxxxxxxxx> wrote:
> > > Thanks Ramnivas,
> > > 
> > > Can I somehow extend the perthis aspect to also capture the C.new
> > > instances
> > > made inside the aspect or am I completely off track here?
> > > 
> > > Cheers
> > > Neil
> > > ----- Original Message ----- 
> > > From: "Ramnivas Laddad" <ramnivas@xxxxxxxxx>
> > > To: <aspectj-users@xxxxxxxxxxx>
> > > Sent: Monday, September 08, 2003 3:15 PM
> > > Subject: Re: [aspectj-users] perthis Question
> > > 
> > > 
> > > > This has to do with "implicit limiting of join points"
> > > > for per- aspects. In case of perthis()  aspect, the adivce
> > > > in the aspect will limit the join points captured to where
> > > > 'this' matches the one specified in perthis() association
> > > > specification.
> > > >
> > > > In you example, it means it will match only join points
> > > > where 'this instanceof Foo' is true.
> > > >
> > > > -Ramnivas
> > > >
> > > > --- neil loughran <n.loughran@xxxxxxxxxxxxxxx> wrote:
> > > > > Hello,
> > > > >
> > > > > I'm having problems using the perthis construct.
> > > > >
> > > > > The code below shows how an aspect "MyAspect" can be
> associated
> > > with
> > > > > each Foo object.
> > > > >
> > > > > However, the after advice relating to calls of C.new don't
> appear
> > > to
> > > > > work.
> > > > >
> > > > > Yet remove the perthis construct and it works correctly..
> > > > >
> > > > > Can anyone tell me what the reason is behind this behaviour?
> > > > >
> > > > > Thanks
> > > > > Neil
> > > > >
> > > > >
> > > > >
> > > > > class A
> > > > >  {
> > > > >
> > > > >  public static void main(String args[])
> > > > >  {
> > > > >   Foo a=new Foo();
> > > > >   Foo b=new Foo();
> > > > >   }
> > > > >  }
> > > > >
> > > > >
> > > > >
> > > > > class Foo
> > > > >  {
> > > > >  public Foo()
> > > > >   {
> > > > >   new Bar("Hello");
> > > > >   }
> > > > >  }
> > > > >
> > > > >
> > > > > class Bar
> > > > >  {
> > > > >  public Bar(String s)
> > > > >   {
> > > > >   System.out.println(s);
> > > > >   }
> > > > >  }
> > > > >
> > > > >
> > > > > aspect MyAspect perthis (execution(Foo.new()))
> > > > >  {
> > > > >  private int count = 0;
> > > > >  after(String s) : args(s) && call(Bar.new(String))
> > > > >   {
> > > > >   System.out.println("new Bar "+count);
> > > > >   count++;
> > > > >   new C();
> > > > >   }
> > > > >
> > > > >  after() : call (C.new())
> > > > >   {
> > > > >   System.out.println("new C ");
> > > > >   }
> > > > >  }
> > > > >
> > > > > class C
> > > > >  {
> > > > >  public void methodC()
> > > > >   {
> > > > >   System.out.println("C");
> > > > >   }
> > > > >  }
> > > >
> > > >
> > > > =====
> > > > Ramnivas Laddad
> > > > Author, AspectJ in Action
> > > > http://www.manning.com/laddad
> > > > http://www.amazon.com/exec/obidos/ASIN/1930110936
> > > >
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