Re: [aspectj-users] perthis Question

["neil loughran" <n.loughran@xxxxxxxxxxxxxxx>]

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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