An clean way to implement finite-state machines is Akka FSM [1]. I recently wrote a blog post about it: http://news.ycombinator.com/item?id=3976558 http://news.

An clean way to implement finite-state machines is Akka FSM [1]. I recently wrote a blog post about it: http://news.ycombinator.com/item?id=3976558 http://news.ycombinator.com/item?id=3976558 [1] http://doc.akka.io/docs/akka/snapshot/scala/fsm.html http://doc.akka.io/docs/akka/snapshot/scala/fsm.html