From: Ruby Newbie <rubynewbie@...>
Date: 2006-06-15T02:00:51+09:00
Subject: Re: Cut-based AOP

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Thanks Eric.  As I see evil.rb, and Object#become - we're basically looking
at object inheritance, which may get the job done in some cases, but
violates the separation which AOP is attempting to provide/enforce.  I'm new
to AOP as well as Ruby, but strictly from an OOP persepective, I don't want
to assume the responsibility for all methods of the parent for the purpose
at hand - behavior monitoring / modification of 1-n methods of the class.


On 6/14/06, Eric Mahurin <eric.mahurin@gmail.com> wrote:
>
> On 6/14/06, Ruby Newbie <rubynewbie@gmail.com> wrote:
> > Can you provide references to better and more-established ways of
> offering
> > such
> > extensibility?  I looked briefly at traits which you'd alluded to
> earlier,
> > but it requires changes to the core code for trait/hook insertion.  I'm
> > interested to read about other mechanisms which are more maintainable
> and
> > extensible than AOP in Ruby if you could please share them.
>
> Here is a way to get 99% of this cut-based AOP thing (that is
> overengineered as Austin says):
>
>
> http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/295923d21d6c1842/5034dcf0262ebc1e
>
> All you need is Object#become from evil.rb.  You could write a few
> wrappers to make this look prettier.
>
> I think if some AOP thing is added to ruby, it should be something
> very simple that could be extended to some elaborate AOP framework
> (rather than starting with an elaborate framework as trans suggested -
> that includes new keywords!).  Here are some of the simple things that
> could be used as a a basis for AOP:
>
> - pre and post method hooks (what matz is planning)
>
> - Object#become/Class#replace.  Can be implemented now in pure ruby (
> evil.rb)
>
> - something like Module#include except "super" (or something else) in
> the included methods refers to the previous method definition.
>
> Eric
>
>

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