is it safe to close over the actor context in akka scheduler

Question

I know that it's not safe to close over the sender method call or the internal state of the actor in a Future or a scheduler, but what about the actor context? what are in an ActorContext? Is it safe to close over the actor context in a scheduler or a future callback, like this? :

def receive: Receive = {
  case Msg => 
    system.scheduler.scheduleOnce(1 second) {
       context.actorOf[ChildActor]
    }
}

Answer 1

No, it is not safe to close over an actor context. From akka source:

/**
   * Stores the context for this actor, including self, and sender.
   * It is implicit to support operations such as `forward`.
   *
   * WARNING: Only valid within the Actor itself, so do not close over it and
   * publish it to other threads!
   *
   * [[akka.actor.ActorContext]] is the Scala API. `getContext` returns a
   * [[akka.actor.UntypedActorContext]], which is the Java API of the actor
   * context.
   */
implicit val context: ActorContext = { ...