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Message-ID: <3C17A27F.6060601@apache.org>
Date: Wed, 12 Dec 2001 13:31:27 -0500
From: Berin Loritsch <bloritsch@apache.org>
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To: cocoon-dev@xml.apache.org
Subject: Re: [WARNING] Version migrations are a headache!
References: <3C179D4A.8000703@apache.org>
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Berin Loritsch wrote:

Does ANYONE remember what the value was for:

Constants.SESSION_STATE_ATTRIBUTE?

Or what it was replaced with?

> The problem comes with changing dependencies and classnames.  For 
> example the
> SessionStateSelectorFactory has been renamed the SessionAttributeSelector.
> While the second is arguably a better name, please use deprecation so that
> users can be warned before the class is eliminated!
> 
> Avalon Excalibur has a few classes which follow the following approach:
> 
> /**
>  * @deprecated Use ExcaliburComponentManager instead!
>  */
> class DefaultComponentManager extends ExcaliburComponentManager{}
> 
> This way the functionality is the same, but the user is pointed to the
> correct version gracefully.
> 
> It is a number of issues like this, the constant rearranging of the core
> components, etc. that make moving between Cocoon versions a headache.
> 
> I honestly think we have a few too many different types of core components,
> and it would be better if they were rearranged a bit.
> 
> This is especially true since people have portions of the cocoon.xconf
> file that are specialized to their site!
> 
> DANGER, WILL ROBINSON!
> *Any* time you add a new abstract method to an abstract class, or change
> an abstract method on an abstract class--that change is NOT BACKWARDS
> COMPATIBLE!
> 
> I have some specialized actions that extend 
> AbstractComplimentaryConfigurableAction
> that are now broken because of this very thing.  Now I have to figure out
> what changed!
> 


-- 

"They that give up essential liberty to obtain a little temporary safety
  deserve neither liberty nor safety."
                 - Benjamin Franklin


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