Supporting transient states using Akka FSM

[Christopher Hunt]

Hey there,

I've recently come across a situation with transient FSM states that I'd like to model in Akka FSM. I'm wondering if there's a better way than below in terms of expressing transient states:

onTransition {
 case A -> B
   goto(C)
}

when(B) {
  case _ =>
    log.error("we should never have got here")
}

i.e. I need the when(B) in order to register the state. However, it is a state that we quickly pass through and serves to support the onTransition logic.

Is there a better way while retaining the B state?

Cheers,

-C

[Heiko Seeberger]

Hmm … ain’t is possible to goto(C) when in state A? Instead of going to the transient B.

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Heiko Seeberger

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[Christopher Hunt]

You may not always want to go to C. My example didn’t highlight that, so apologies. 

It turns out that you can’t goto within anything other than a when handler anyhow (which makes sense to me).

What I did subsequently was send a message to self during B’s onTransition and capture it within B’s when. The code looks decent and correct in accordance with my state machine diagram. 

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