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(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."
Hope
this helps
Elizabeth
Hello,
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.
Regards,
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