On 4 Jul,2014, at 9:28 , Matthias Wessendorf <matzew@apache.org> wrote:

2) Initial quick and simple solution based on JAX-RS and JPA:

- We have versioning in JPA (optimistic locking) - Use it (send 409 on server and send right data)

-- Use JAX-RS ExceptionMapper for exceptions around the optimistic locking ?

Added handling of OptimisticLockException to forge https://github.com/forge/core/pull/481 this will give clients a 409 so that they could show to the user that their copy was out of date. Now the client still need to react to this.

- Client library will have helper methods for managing data

POC of client handeling this https://github.com/edewit/aerogear-push-quickstarts/tree/conflict/client/cordova/angular/www this will just show the client version and the server version and the user can choose which version to take

- Use push to send notifications that data changed?
- JAX-RS Annotation to send notifications?