ActorRef, sending messages to it will emit them on the stream.
ActorRef, sending messages to it will emit them on the stream. The actor contain a buffer but since communication is one way, there is no back pressure. Handling overflow is done by either dropping elements or failing the stream, the strategy is chosen by the user.
emits when there is demand and there are messages in the buffer or a message is sent to the actorref
completes when the
ActorRef is sent