From: Richard <RichardDummyMailbox58407@...>
Date: 2006-12-02T13:20:10+09:00
Subject: Re: Is there a simply way to get every method log itself before running?

Hi Bill,

Thanks for responding.

> Since you mentioned Rails, I'll assume you're using it.
You're right on :-)

> ActionController::Filters::ClassMethods ... after_filter
I've used the before_filter,  but I never noticed the after_filter,  so
it's nice to learn about it.

Hope, as a Rails newbie,  I'd like to trace through every method
invoked in a simple Rails app and display "interesting" things, e.g.
the arguments it received and the the value it returned.  But I want to
make that happen in an automated way, e.g.  inject my debug routines at
the entry and exit points,  which is what Aspect-Oriented Program is to
make easy to accomplish.

I've had some help in getting set_trace_func working,  but I haven't
figured out yet whether that will do what I want.  And I've looked at
Needle but haven't gotten Dependency Injection even coded yet.

The holy grail for me is automated temporary transform of my Rails app.
 Is there a way that an after_filter could be specified at the top
level of a Rails app and have it operate on all the subordinate
methods?

Regards,
Richard




bill walton wrote:
> Hi Richard,
>
> Richard wrote:
> > I'd like to write a trace function and have every method
> > execute that trace when the method's invoked.  In that
> > trace function,  I'd like to be able, e.g. to write the
> > invoked method's name, perhaps more.
> >
> > Is there an easy way to do that?
> >
> > BTW,  I posted this question on the Ruby/Rails Newsgroup
> > before Irealized it's more appropriate here.
>
> Since you mentioned Rails, I'll assume you're using it.  If not, this
> won't apply.
>
> Check out the Class documentation ( http://api.rubyonrails.org , left
> panel, middle section) for ActionController::Filters::ClassMethods.
> You're probably looking for an after_filter given that you may want to
> store some stuff you 'compute' in the method.
> 
> hth,
> Bill