[cgiapp] RE: :App, CGI::Session and CGI::Simple

[Ron Savage <suppressed>]

On Tue, 27 Apr 2004 07:54:50 -0400, Kinyon, Rob wrote:

Hi Rob

> 1) You will want to do that kind of checking when you are handed the
> object in your constructor. So, you'll have to compile a list of
> methods
> the object will need to handle. Now, this is a good thing, from a
> documentation standpoint, but it's not what you suggested.

Yep. Cees suggested CGI provide a list of methods. I emailed Lincoln 
Stein about this yesterday, but so far no response.

> 2) My CGI::Application children have a param() method (inherited
> from
> C::A). Now, if I provide a cookie() method (say, to handle my
> site-specific cookies), I now pass your interface requirements.
> But, I'm
> positive I won't be doing what you want.

There is, I hope, a mis-understanding here. Here's the situation:

#!/usr/bin/perl
use CGI::Simple;
use DBIx::Admin::Application;
DBIx::Admin::Application -> new(QUERY => CGI::Simple -> new() ) -> 
run();

DBIx::Admin::Application is of course a CGI::Application-type class.

The ugly-named QUERY parameter is taking an object we hope can() 
cookie and param.

I can't imagine why you would be passing an object of type 
DBIx::Admin::Application to itself or to another object of the same 
type, so the fact that objects of type DBIx::Admin::Application can() 
cookie and param is just not relevant.

If some arbitrary class offers cookie and param, then yes, it is a 
candidate for QUERY, but some logical errors are left as exercises for 
the programmer to avoid :-).

> The -real- solution is not available until Perl6 when Roles are
> introduced into the language. At that point, you will be able to
> ask "if
> ($class does CGI)" and be done with it.

Sure, but I'd like a solution today, not in N years time, for some 
hopefully small value of N :-).
-- 
Ron Savage, suppressed on 28/04/2004. Room EF 312
Deakin University, 221 Burwood Highway, Burwood, VIC 3125, Australia
Phone: +61-3-9251 7067, Fax: +61-3-9251 7604
http://www.deakin.edu.au/~rsav



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