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From Glen Ezkovich <g...@hard-bop.com>
Subject Re: servicemanager and jxtg (was: WishFull thinking JX and SessionContext Authentication)
Date Mon, 24 Jan 2005 19:44:26 GMT

On Jan 24, 2005, at 11:15 AM, Stefano Mazzocchi wrote:

> BURGHARD √Čric wrote:
>
>> Injecting data is the point, but for me "looking up data from a 
>> database" is
>> quite like "injecting data".
>
> Not for me. Read why below.
>
>> Just it's not from session but who cares.
>> Passing through flow for something that has nothing to do with logic, 
>> and
>> because it's not in session, just let me think that there should 
>> certainly
>> exist a better way.
>
> The problem is to separate concerns. We aim to have a template 
> language that we can give to graphic designers and therefore they will 
> be given the page and the variables that contain the dynamic data they 
> need to present. No other information is required for them to 
> accomplish their task.

So we should just pass strings!! Just kidding, at least from a 
practical point of view.

>
> This is IoC at the template level and all the information on "how to 
> populate the context" is somewhere else (at the 'controller' level).
>
> By placing even a single <sql:query>select * from users</sql:query> in 
> the template you are breaking this isolation because now template 
> designers need to know the structure of the database (and they 
> don't!), so this resorts in having two people having to maintain the 
> same page.
>
> So, normally, this ends up having a pipeline, one person manages the 
> generator the other manages the transformer, but at this point, the 
> contract between the two gets bigger than a simple template context.

Well put. I couldn't agree more.

>
> -- 
> Stefano.
>
>

Glen Ezkovich
HardBop Consulting
glen at hard-bop.com
http://www.hard-bop.com



A Proverb for Paranoids:
"If they can get you asking the wrong questions, they don't have to 
worry about answers."
- Thomas Pynchon Gravity's Rainbow


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