Hi,

last week at our Face2Face we had a discussion about sync, moving forward on the client (will be a different thread) and on the server.

For the server-side we had a few different approaches:

1) AeroGear Sync-Server: Dan and Luke worked on the sync-server ([1]) as a 'long term' solution

The project contains two server implementations:

- RestServer implementation that uses a simple approach of rejecting conflicts and delegating the responsibility to resolve conflicts to the client.

- DiffServer Based on Google's Differential Synchonrization by Neil Fraser. This server is WebSocket based.

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 ?

- Client library will have helper methods for managing data

- Use push to send notifications that data changed?

- JAX-RS Annotation to send notifications?

I'd like to follow up on that, to see where things stand

Greetings,

Matthias