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Re: [aspectj-users] One target for intertype declarations

Hi Matthew,

No. A reference to the aspect is held in the target object (introduced by
the compiler rather like an ITD) so the aspect will automatically be
garbage collected at the same time as the object.

That's interesting. So, is there any actual difference between using an ITD instead of pertarget? Is the reference put into all objects matching the pertarget pointcut, or just into objects for which an aspect is created?


Cheers,

Dave

Matthew Webster
AOSD Project
Java Technology Centre, MP146
IBM Hursley Park, Winchester,  SO21 2JN, England
Telephone: +44 196 2816139 (external) 246139 (internal)
Email: Matthew Webster/UK/IBM @ IBMGB, matthew_webster@xxxxxxxxxx
http://w3.hursley.ibm.com/~websterm/

David Pearce <david.pearce@xxxxxxxxxxxxx>@eclipse.org on 11/11/2004
03:51:06

Please respond to aspectj-users@xxxxxxxxxxx

Sent by:    aspectj-users-admin@xxxxxxxxxxx


To: aspectj-users@xxxxxxxxxxx cc: Subject: [aspectj-users] One target for intertype declarations


Hi all,

I would just like to confirm something regarding the elimination of
"multi-intertype declarations".  Basically, I want to add a field to
every object instance.  So, perviously, I could have just used something
like:

aspect A {
         public int *.theField = 0;
}

But, since AspectJ 1.1 this syntax is no more.  So, now my question.  Is
the pertarget specifier supposed to be used instead of the above now?  I
realise that the README-11.html indicates pertype should be used for
static field member introduction (if it existed, that is), so I figure
the reasoning is the same.

Also, how is pertarget actually implemented?  Does it involve some kind
of hashmap lookup or not?  If not, then what?

Any help would be appreciated!

David J. Pearce
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