DotNetWorkQueue.Transport.Redis.Basic.RedisQueueReceiveMessages.ReceiveMessageAsync C# (CSharp) Method

        public async Task<IReceivedMessageInternal> ReceiveMessageAsync(IMessageContext context)
        {
            context.Commit += ContextOnCommit;
            context.Rollback += ContextOnRollback;
            context.Cleanup += context_Cleanup;

            TimeSpan? timeout = null;
            IMessageId messageId = null;
            var rpc = context.Get(_headers.StandardHeaders.RpcContext);
            if (rpc?.Timeout != null)
            {
                timeout = rpc.Timeout;
            }
            if (rpc?.MessageId != null)
            {
                messageId = rpc.MessageId;
            }

            using (
                var workSub = rpc?.MessageId != null && rpc.MessageId.HasValue
                    ? _workSubFactory.Create(rpc.MessageId)
                    : _workSubFactory.Create())
            {
                while (true)
                {
                    if (_cancelWork.Tokens.Any(m => m.IsCancellationRequested))
                    {
                        return null;
                    }

                    var message = await GetMessageAsync(context, messageId).ConfigureAwait(false);
                    if (message != null && !message.Expired)
                    {
                        return message.Message;
                    }

                    if (_cancelWork.Tokens.Any(m => m.IsCancellationRequested))
                    {
                        return null;
                    }

                    workSub.Reset();
                    message = GetMessage(context, messageId);
                    if (message != null && !message.Expired)
                    {
                        return message.Message;
                    }
                    if (message != null && message.Expired)
                    {
                        continue;
                    }
                    if (workSub.Wait(timeout))
                    {
                        continue;
                    }

                    return null;
                }
            }
        }