I have a scenario where I have to restart a child Actor from within a
parent actor. The restart should happen with the following rules:
1. The start should happen only after stop has been completed
2. Both the stop and start should happen asynchronously
I now have the following scenario:
In my parent Actor, I have a Monix Observable which is pushing events as
below:
class ParentActor extends Actor {
...
override def preStart(): Unit = {
super.preStart()
// Observable to stream events regarding PowerPlant's
val powerPlantEventObservable =
// For every config.database.refreshInterval in seconds
Observable.interval(config.database.refreshInterval)
// We ask the actor for the latest messages
.map(_ => (dbServiceActor ?
DBServiceActor.PowerPlantEvents).mapTo[PowerPlantEventsSeq])
.concatMap(Observable.fromFuture(_))
.concatMap(Observable.fromIterable(_))
// Subscriber that pipes the messages to this Actor
cancelable := powerPlantEventObservable.subscribe { update =>
(self ? update).map(_ => Continue)
}
}
}
So what happens above is that, I'm asking another Actor called
DBServiceActor for a List of events and when these events are available,
I'm piping it to the ParentActor (self ? update). The receive method of the
ParentActor looks like this and this is where I want to restart my child
actor . asynchronously:
override def receive: Receive = {
case PowerPlantUpdateEvent(id, powerPlantCfg) =>
log.info(s"Re-starting PowerPlant actor with id = $id and type
${powerPlantCfg.powerPlantType}")
// I want to stop the actor first by finding it from the actor system
// If it exists, do a context.stop on the Actor instance
// Once it is stopped, I want to start it again by creating a new
instance of this Actor
// Once this new Actor instance is created, I want to signal my Monix
Observer to send me the next event
}
Any suggestions?
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