[jira] Commented: (TORQUE-50) Supporting local and add-on Generator "Override" jars

["Thomas Fischer (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/TORQUE-50?page=comments#action_12437801 ] 
            
Thomas Fischer commented on TORQUE-50:
--------------------------------------

Reorganized contribution as outlined above and committed it., excluding the part about how to submit patches. I will try to include TORQUE-54 as a contribution and then make a suggestion how I think contributions should be handled.

> Supporting local and add-on Generator "Override" jars
> -----------------------------------------------------
>
>                 Key: TORQUE-50
>                 URL: http://issues.apache.org/jira/browse/TORQUE-50
>             Project: Torque
>          Issue Type: Improvement
>          Components: Documentation, Generator, Maven-Plugin
>    Affects Versions: 3.2.1
>            Reporter: CG Monroe
>            Priority: Minor
>             Fix For: 3.2.1
>
>         Attachments: Generator Override Support.zip
>
>
> <From an e-mail proposal talked about on the torque-dev list>
> I've been looking at how to package, document, contribute
> my betwixt map/dtd generation code.  As Thomas pointed out, 
> it's not truely mainstream Torque but might be a useful 
> addon. Anyway, this got me thinking about how to best 
> support template and/or generator local modifications or 
> add-on. 
>  
> If the generator build scripts supplied by the Torque 
> distro had classpaths that first tried to add any 
> *-override.jar files before the distro files, then 
> Templates and generator classes could easily be locally 
> overriden.  This is trivial to do with the Ant 
> torque-build.xml.  I assume that it would be easy in Maven?  
>  
> If no *override.jar files exist, it's a standard install.  
> But if you've got local changes to implement or want to 
> use a supplied add-on, just add *override.jar files to the
> correct directory(s) and use the standard generation
> processes.
>  
> IMHO, this seems cleaner than trying to maintain a full
> customized template or generator distros.  If a new 
> version comes out, just grab the standard, check for
> any gottcha's between it and your modified code, add back
> in your override jars.  All the benefits of a new version
> with your local mods included.
>  
> In a lot of cases, like changes to sql generation 
> templates (e.g. MySQL Table options ) or new db 
> adaptor support (like Informix/MSSQL7), this will be 
> very easy.  These areas don't change a lot or are
> mostly new templates. 
>  
> It also allows for easier add-on contributions.  An add-on
> could be supplied as a set of jars that are simply put in
> the correct directories using common How-To instructions.
> The add-in supplier just needs to document any additional
> settings.
>  
> It's not perfect since add-on's can override each other 
> and break... but it's better than it was.

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