private async Task <ISet <PubSubSubscriptionState> > RegisterProducer() { var tup = await providerRuntime.BindExtension <SimpleMessageStreamProducerExtension, IStreamProducerExtension>( () => new SimpleMessageStreamProducerExtension(providerRuntime, fireAndForgetDelivery)); myExtension = tup.Item1; myGrainReference = tup.Item2; myExtension.AddStream(stream.StreamId); // Notify streamRendezvous about new stream streamProducer. Retreave the list of RemoteSubscribers. return(await pubSub.RegisterProducer(stream.StreamId, streamProviderName, myGrainReference)); }