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https://issues.apache.org/cayenne/browse/CAY-915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12593
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Ari Maniatis commented on CAY-915:
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I'm not seeing the "compelling reason to keep two hierarchies separate". Would 
it not be always better to have a common superclass for both client and server? 
I know it would make a huge amount of my code much much easier to deal with 
(for example, we implement validation on both client and server side since we 
want real time validation without a trip to the server).

I know this common superclass approach is lots of work, but shouldn't that be 
the goal?

> Add ability to generate a common interface for client and server classes
> ------------------------------------------------------------------------
>
>                 Key: CAY-915
>                 URL: https://issues.apache.org/cayenne/browse/CAY-915
>             Project: Cayenne
>          Issue Type: New Feature
>          Components: CayenneModeler GUI
>    Affects Versions: 3.0
>            Reporter: Kevin Menard
>            Assignee: Kevin Menard
>             Fix For: 3.0
>
>
> Currently there is a divide between ROP client and server classes.  
> Ultimately, it'd be nice to see some unification of the two.  In some 
> applications, however, there is compelling reason to keep two hierarchies 
> separate.  In that case, it may still be beneficial to have a common 
> interface that other code can use to interact with both client and server 
> classes.
> Off hand, I'm thinking of two new fields to the class generation panel in the 
> modeler:
> 1) Check box for indicating that the interfaces should be generated
> 2) A text field for specifying the package to use
> This also implies modifications to both the client and server superclass 
> velocity templates.

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