Monday, April 27, 2009

GUI-server communication -- HFT (Piroz)

Mostly based on a veteran's input...

Most GUI clients I have seen use some sort of messaging and you want that to be as asynchronous as possible.  There is no reason to keep the user waiting.  User clicks on something, the client sends a message to the server and the client is now waiting for a response.  When a response comes in (on a separate thread), the GUI takes it and displays whatever it needs.  Some people stick a unique request id in the message so when the response comes they can figure out to which request it belongs.

You also have subscription cases where you subscribe to prices for a security and the server will tell you listen to this channel for all updates.  That should be encapsulated in some sort of handshake.
RV, 29West and JMS are good choices.

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