The following code:
Welcome to Scala 2.12.0 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_112).
Type in expressions for evaluation. Or try :help.
scala> import akka.actor._; import scala.concurrent._; import duration._
import akka.actor._
import scala.concurrent._
import duration._
scala> :paste
// Entering paste mode (ctrl-D to finish)
val s = ActorSystem("test")
def onTerm = {
println("Waiting...")
Await.result(s.whenTerminated, Duration.Inf)
println("Fin!")
}
s.registerOnTermination(onTerm)
// Exiting paste mode, now interpreting.
s: akka.actor.ActorSystem = akka://test
onTerm: Unit
scala> s.terminate
res1: scala.concurrent.Future[akka.actor.Terminated] = Future(<not
completed>)
scala> Waiting...
At this point the future doesn't terminate. Looking at the documentation of
*whenTerminated*; "Returns a Future which will be completed after the
ActorSystem has been terminated and termination hooks have been executed".
It's probably a good idea to indicate on the *registerOnTermination* method
that it's dangerous to wait on the whenTerminated future from the callback.
Chris
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