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Message-ID: <3E1CADE1.5090904@apache.org>
Date: Wed, 08 Jan 2003 15:01:53 -0800
From: Stefano Mazzocchi <stefano@apache.org>
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To: cocoon-dev@xml.apache.org
Subject: Re: [Flow]: Modularizing flow scripts
References: <Pine.LNX.4.44.0301081737180.30604-100000@lapgp>
 <3E1C5AF9.2060808@cbim.it>
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Ugo Cei wrote:
> Giacomo Pati wrote:
> 
>> On Wed, 8 Jan 2003, Ugo Cei wrote:
>>
>>> My flowscript is getting big, and I've coded just a fraction of the
>>> functionality of my app.
>>
>> What is big for you in terms of lines?
>>
> 
> The one I'm currently working on is about 300 lines and I'm starting to 
> feel unconfortable about it. The problem is that this script contains 
> just some minimal user management functions and now I'd like to start 
> adding some application-specific functions. I'd rather not keep them 
> together, considering also the fact that I might wnat to reuse the 
> user-management functions in another app.
> 
>  > I thought a flowscript would be small and logic is modularized into Java
>  > classes.
> 
> Mostly it is, but each function has (typically) to:
> 
> - check some preconditions (is the user logged in, is she authorized?)
> - initialize or retrieve some domain objects
> - invoke a view (typically a form)
> - retrieve data from the posted form
> - validate them
> - store the domain object
> - maybe do the same for one or more other forms in a sequence
> - handle exceptions
> - etc.
> 
> So, even putting most of the code in Java classes, we're still talking 
> of a screenful of lines per function. And in some applications, you 
> might have tens, if not hundreds of them.

Just FYI, JavaScript has the ability to pass a function as a parameter 
of another function. That makes a pretty light and cheapo 
aspect-orientation way.


-- 
Stefano Mazzocchi                               <stefano@apache.org>
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