public async Task QueueMessageBatchAsync <T>( Guid streamGuid, string streamNamespace, IEnumerable <T> events, StreamSequenceToken token, Dictionary <string, object> requestContext) { if (token != null) { throw new ArgumentException( "ServiceBus stream provider does not support non-null StreamSequenceToken.", nameof(token)); } var queueId = _streamQueueMapper.GetQueueForStream(streamGuid, streamNamespace); if (!Queues.TryGetValue(queueId, out var queue)) { if (!IsConnected) { await ConnectAsync(); } var tmpQueue = new ServiceBusAdapterSender(_loggerFactory, _serializationManager, Client !, QueueOptions, _streamQueueMapper.QueueIdToQueueName(queueId)); await tmpQueue.InitializeAsync(); queue = Queues.GetOrAdd(queueId, tmpQueue); } await queue.SendAsync(streamGuid, streamNamespace, events, requestContext); }