This is not fully on topic (see my other email in this thread which
was more to the point), still... there's one cool feature that I've
discussed with somebody offline some time ago. Often you need to work
offline and then synchronize the data saved offline back to the server
when the client goes online, and pull the changes made by other
clients back to your client. Not unlike the way git or other DSCM
operate, to give an analogy.
Cayenne object graph change tracking "protocol" is basically ready for
such scenario, as each individual object change is recorded
internally, and can be replayed later. The challenge is to implement
the actual flow, data merging and conflict resolution algorithms. I've
made some back-of-the-napkin design for that, but didn't have time to
write the code as a side project, and didn't have any ongoing paying
projects which would require this feature and could've covered the
implementation costs.
So mentioning this here just in case someone in the community would
like to step in. IMO this could become a killer feature of the ROP.
Andrus
On Aug 8, 2009, at 9:51 PM, Aristedes Maniatis wrote:
On 6/08/09 7:49 AM, Michael Alderton-Smith wrote:
The problem I see, is that any references to classes in my code are
to
the client classes generated by Cayenne for the server objects, but
would need to be the actual full server classes to work with the
derby
database, so I see no way of making all my code generic.
There has been some talk of merging the client and server classes,
however it is considerable work and I would not count on it any time
soon.
Any help would really be appreciated. I haven't been working with
Cayenne for long, but it's been good enough for me to give up on
hibernate, jpa and all the other alternatives due to it's remoting
capability.
Yes, it is very good for that. But unfortunately I don't see a quick
solution for your needs, even though I'd love to implement the same
thing myself in one on my applications.
Ari Maniatis
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Aristedes Maniatis
GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A
