Rails - Nov 2006 - Using Aspect Oriented Programming in Ruby to simplify tracing

Is their a simple way to automatically insert a trace function
invocation at the start or every method of a rails app?  I want to use
SimpleTrace to an IO stream or logger.debug to the log file to output
each invoked method''s name and the arguments it''s called with,
at a
minimum.

I understand that''s an easy thing to do with Aspect.  I see that
there''s a patch to Ruby 1.8.2 that introduces a Cut that implements AOP
for Ruby.

Has anybody used it?  And I wonder whether it would do what I want to
do.  (I only skimmed it''s description.)

Is there some other implementation "out there?"

Regards,
Richard


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Hi,

(Note:  This was originally submitted to Ruby-Talk on Google Groups,  but it 
failed to get posted.  Hence this was submitted to 
gmane.comp.lang.ruby.rails using Outlook Express.  Hopefully it will have a 
better fate.)

Is there a simple way to automatically insert a trace function invocation at 
the start or every method of a rails app?  I want to use SimpleTrace to an 
IO stream or logger.debug to the log file to output each invoked
method''s
name and the arguments it''s called with, at a minimum.



I understand that''s an easy thing to do with Aspect.  I see that
there''s a
patch to Ruby 1.8.2 that introduces a Cut that implements AOP for Ruby.



Has anybody used it?  And I wonder whether it would do what I want to do. 
(I only skimmed it''s description.)



Is there some other implementation "out there?"



Regards,

Richard






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An alternative idea:  Is it possible to put some kind of "before:
ShowFilename" and define the ShowFilename method in top-level code that
will be inherited by all other code in the app (with ShowFilename
writing something like _FILENAME_ evaluated in the context of the
lower-level code)?

I''ve seen some neat Ruby metaprogramming examples,  but I''m
too new to
Ruby to implement my idea.


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An alternative idea:  Is it possible to put some kind of
":before ShowFilename",
with the ShowFilename method defined in top-level code that
will be inherited by all other code in the app ... with ShowFilename
writing something like _FILENAME_ evaluated in the context of the
lower-level code?

I''ve seen some neat Ruby metaprogramming examples,  but I''m
too new to
Ruby to implement my idea without some guidance.


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I got a couple of good answers at
http://groups.google.com/group/microsoft.public.office.misc/tree/browse_frm/thread/93649aab3f5e4eec/6e4ae772e7dc0e42?rnum=1&_done=%2Fgroup%2Fmicrosoft.public.office.misc%2Fbrowse_frm%2Fthread%2F93649aab3f5e4eec%3F#doc_6e4ae772e7dc0e42

As far as I''m concerned, this thread is dead.


Richard Lionheart wrote:
> Hi,
>
> (Note:  This was originally submitted to Ruby-Talk on Google Groups,  but
it
> failed to get posted.  Hence this was submitted to
> gmane.comp.lang.ruby.rails using Outlook Express.  Hopefully it will have a
> better fate.)
>
> Is there a simple way to automatically insert a trace function invocation
at
> the start or every method of a rails app?  I want to use SimpleTrace to an
> IO stream or logger.debug to the log file to output each invoked
method''s
> name and the arguments it''s called with, at a minimum.
>
>
>
> I understand that''s an easy thing to do with Aspect.  I see that
there''s a
> patch to Ruby 1.8.2 that introduces a Cut that implements AOP for Ruby.
>
>
>
> Has anybody used it?  And I wonder whether it would do what I want to do.
> (I only skimmed it''s description.)
>
>
>
> Is there some other implementation "out there?"
> 
> 
> 
> Regards,
> 
> Richard

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