this.actorContext = Preconditions.checkNotNull(actorContext, "actorContext should not be null");
this.client = null;
this.identifier = Preconditions.checkNotNull(identifier);
this.actorContext = Preconditions.checkNotNull(actorContext, "actorContext should not be null");
this.client = null;
this.identifier = Preconditions.checkNotNull(identifier);