return object diff to client in ROP after commit
------------------------------------------------
Key: CAY-789
URL: https://issues.apache.org/cayenne/browse/CAY-789
Project: Cayenne
Issue Type: Improvement
Components: Cayenne Core Library
Affects Versions: 3.0
Reporter: Ari Maniatis
Assigned To: Andrus Adamchik
Currently, when an object is committed in three tier environment from the
client, the PK is returned to the client. However with the possibility of other
changes being made to that object in Lifecycle callbacks, the client will be
left with a stale copy of the object. I see three solutions, from simplest to
most complicated:
1. after every commit on the client, mark the object as HOLLOW. Although this
will generate a little more traffic sometimes, it is probably not significant
in most workflows.
2. return a flag from the server if the object was touched in a lifecycle
event. This then sets HOLLOW on the client.
3. return the diff of changes to the object to the client
Although at first glance (3) looks like it might be most efficient, it actually
may not be. In many cases the developer discards a context immediately after
committing the data in it, in which case the diff was returned unnecessarily.
This is our situation since our list views use a shared context (read only) and
each edit view creates a new specific editing context which is discarded upon
save and closing the window.
Others might have different workflows.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
