On Thu, Apr 30, 2009 at 10:35 AM, Rickard Öberg <[email protected]>wrote:
> Guus Bloemsma wrote: > >> What I want to do is to just move GUI code plus one or more entities to >> the browser. This way simple businesslogic (that doesn't need backends like >> DB's) can be executed right there. >> > > On GUI's, I'd like to share what's going on in the StreamFlow project. We > started with a Swing WebStart client that executed the domain model on the > client, using a REST EntityStore to get the data. > > For various reasons we have now changed so the distributed part of the > domain model runs on the server, and all interaction is done using the > CommandQuerySeparation pattern, implemented using REST. What this means is > that the UI first queries the server for data, which is returned as > ValueComposites. The endpoint is served through REST, so the ValueComposite > gets serialized to JSON and then deserialized on the client. The UI then > views this, allows the user to make decisions, and then constructs > ValueComposites representing commands which are POSTed or PUT back to the > server, where they are consumed by an application service that executes the > command in a local UnitOfWork. > > This means that the client ONLY sees ValueComposites. No Entities of shared > data is on the client. I have a client side part of the domain though, which > is executed and stored on the client machine. Do you mean that you have some kind of proxy of the entity on the client? If not, how do you avoid recoding domain logic that is already in the entity? > There are many advantages with doing this, including security, minimizing > data transfer size, and concurrency management. One interesting sideeffect, > since we are implementing the state transfer using JSON + HTTP, is that we > can now easily create alternative clients for the application, including a > simple feed reader for Atom variants of the data. > > When the REST part for the client+server has stabilized in my code it will > be contributed back to Qi4j. I also have LOTS of Swing UI helper code that > will be shuffled back into Qi4j when it has stabilized. I'm very interested in that. I did some googling but there's nothing public yet, correct? cheers, Guus
_______________________________________________ qi4j-dev mailing list [email protected] http://lists.ops4j.org/mailman/listinfo/qi4j-dev
