Re: data received from a running servlet

1. Start your long running request (from client), running on a separate thread in the server, and return a unique id for that process.
2. On the server, persist the state of that request using some Id. (do this every X seconds).
3. On the client, make a request to poll (2) every X seconds for the status of the process (use the Id from (1)).
   
4. Update something on your UI to show the % completion from (3).
5. Once polling has shown that the long running process is complete, make a final request to get the result (payload).

Sounds like a lot, but that's how we've been doing it for a while. Of course there are many technologies you can use to do it from XHR, to WebSockets, to Comet/Channels/Errai.

Sincerely,

Joseph

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