Microsoft.AspNetCore.SignalR.Messaging.ScaleoutStream.Close C# (CSharp) Method

        public void Close()
        {
            Task task = TaskAsyncHelper.Empty;

            lock (_lockObj)
            {
                if (ChangeState(StreamState.Closed))
                {
                    _perfCounters.ScaleoutStreamCountOpen.RawValue = 0;
                    _perfCounters.ScaleoutStreamCountBuffering.RawValue = 0;

                    if (UsingTaskQueue)
                    {
                        // Ensure the queue is started
                        EnsureQueueStarted();

                        // Drain the queue to stop all sends
                        task = Drain(_queue, _logger);
                    }
                }
            }

            if (UsingTaskQueue)
            {
                // Block until the queue is drained so no new work can be done
                task.Wait();
            }
        }