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From "Kathey Marsden (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-289) Enable code sharing between Derby client and engine
Date Wed, 17 Aug 2005 16:37:54 GMT
    [ http://issues.apache.org/jira/browse/DERBY-289?page=comments#action_12319057 ] 

Kathey Marsden commented on DERBY-289:
--------------------------------------

The biggest concern for me is upgrade in server configurations where both the client  and
server are in the classpath. See the upgrade scenario  in the previous comment.    

I think taking away the ability to mix versions and requiring  users  to judiciously use 
ClassLoaders in order to upgrade is not reasonable, especially when the reason for the change
cannot be explained in terms of any functionality improvement.

I think 

- We need to allow mixing of client and server versions, both on a protocol level and in the
same classpath.
- We should keep jar file growth commensurate with functionality improvement.
- We should try to avoid asking every user in the world to change their classpath.

For code sharing now, I think constants would be a great place to start since they get compiled
out.

For other code, it seems to me that we will need either some stable internal API (hard to
manage) or some build trick to create a client jar with a separate package namespace for the
common code (weird because the classes in the stack traces  would be a little different than
the actual code).  That's all I have in the way of ideas, but know I really don't want to
see us loose the ability to mix client and server versions.



> Enable code sharing between Derby client and engine
> ---------------------------------------------------
>
>          Key: DERBY-289
>          URL: http://issues.apache.org/jira/browse/DERBY-289
>      Project: Derby
>         Type: Improvement
>   Components: Network Client
>     Versions: 10.0.2.1, 10.0.2.0, 10.0.2.2, 10.1.1.0
>  Environment: N/A
>     Reporter: David Van Couvering
>     Priority: Minor
>      Fix For: 10.2.0.0

>
> Right now, there is no way for the Derby network client to share code with the Derby
engine.  We should have a separate jar file, e.g. derby_common.jar, that contains shared code
and is used by both the client and the engine.  

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