Elizabeth,
You should ask Tra to share 50% of the
credit he gets on this assignment… at least it sure sounds like he’s a student
trying to use the mailing list to do his homework. You get an A for the answer
though ;-)
From:
aspectj-users-bounces@xxxxxxxxxxx [mailto:aspectj-users-bounces@xxxxxxxxxxx] On Behalf Of Echlin Harmer, Elizabeth
Sent: Monday, December 12, 2005
9:37 AM
To: 'Tra My'; 'aspectj-users@xxxxxxxxxxx'
Subject: RE: [aspectj-users] the
use of inter-type declaration for extending a class
(I am quoting Ramnivas Laddad, if you
don't have a copy of AspectJ in Action, run out and get one!)
"A crosscutting concern often needs
to affect a set of classes or interfaces that share a common base type".
(Graphics objects like pointers and menus in Swing come to mind). We can't go
and change the class definition for Menu to inherit from mySpecialComponent
instead of inheriting from Component. Even if you are working with a set of
classes that you control, the whole point of the aspect is to separate
concerns, not to hard-code them into your classes. So you create
mySpecialComponent extends Component, and then define an aspect to insert the
cross-cutting concern into the appropriate children of Component. "The
result of such an arrangement is the decoupling of the aspect from the
application-specific class, thus making the aspect more re-usable."
-----Original Message-----
From: aspectj-users-bounces@xxxxxxxxxxx
[mailto:aspectj-users-bounces@xxxxxxxxxxx]On
Behalf Of Tra My
Sent: December 7, 2005 10:55 AM
To: aspectj-users@xxxxxxxxxxx
Subject: [aspectj-users] the use
of inter-type declaration for extending a class
As I know, in AspectJ there's a declaration like below, with
A and B are classes
declare parents: A extends B;
My question is: is there any real use of this kind of
declaration? I think to change A's parent, we have an easier choice: change
directly in class A's definition. Is there any reason why we should use this
AspectJ declaration ? I hope the AspectJ authors have a reason to think of this
declaration.
A small example would be very good.
I desperately need the answer for this question, any help
would be greatly appreciated.
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