Initialize a StageActorRef which can be used to interact with from the outside world "as-if" an actor. The messages are looped through the GetAsyncCallbackT(ActionT) mechanism of GraphStageTShape so they are safe to modify internal state of this stage. This method must (the earliest) be called after the GraphStageLogic constructor has finished running, for example from the PreStart callback the graph stage logic provides. Created StageActorRef to get messages and watch other actors in synchronous way. The StageActorRef's lifecycle is bound to the Stage, in other words when the Stage is finished, the Actor will be terminated as well. The entity backing the StageActorRef is not a real Actor, but the GraphStageLogic itself, therefore it does not react to PoisonPill.

protected StageActorRef GetStageActorRef(
	StageActorRefReceive receive
)

member GetStageActorRef : 
        receive : StageActorRefReceive -> StageActorRef