Hi Joe,
Watching the child actor before stopping it will give you a Terminated message
which will let you know that the child terminated, so that you can start a
new one. If the id and powerPlantCfg is needed when starting anew you can
put that in the actor state, as a map for keyed by the child ActorRef for
example, so that you can look it up when the Terminated message arrives.
--
Johan
Akka Team
On Mon, Aug 7, 2017 at 9:28 PM, Joe San <codeintheo...@gmail.com> wrote:
> 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?
>
> --
> >>>>>>>>>> Read the docs: http://akka.io/docs/
> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/
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--
>>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
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