Thanks
Ron, I can ask for no higher praise! (although maybe a free copy of Ramnivas'
next book for all the marketing I have been doing)
Elizabeth
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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