I ended up implementing this in JavaScript using Rx, but the core concept is the same: Incoming requests: --a-------------> Requests to server:

I ended up implementing this in JavaScript using Rx, but the core concept is the same: Incoming requests: --a-------------> Requests to server: ---b------------> Responses from server: -----------d----> Updates to app state: ---c--------e---> a - User "sends message" to chat room b - Handler for that action queues a request c - Handler for that action also queues a local update d - Server responds with the sent message e - Handler for that response queues a local update