public bool TryFilterNewPayload(T payload)
 {
     if (PayloadQueue.Contains(payload))
     {
         return(false);
     }
     else if (PayloadQueue.Count < MaxQueueItems)
     {
         PayloadQueue.Enqueue(payload);
         return(true);
     }
     else
     {
         PayloadQueue.TryDequeue(out _);
         PayloadQueue.Enqueue(payload);
         return(true);
     }
 }
        public async Task <bool> TryFilterNewPayload(T payload, Func <T, string> keyExpression)
        {
            var payloadKey = $"{typeof(T).Name}:{keyExpression(payload)}";

            using (await _payloadLock.WaitAsync(payloadKey))
            {
                if (PayloadQueue.Contains(payload))
                {
                    return(false);
                }
                else if (PayloadQueue.Count < MaxQueueItems)
                {
                    PayloadQueue.Enqueue(payload);
                    return(true);
                }
                else
                {
                    PayloadQueue.TryDequeue(out _);
                    PayloadQueue.Enqueue(payload);
                    return(true);
                }
            }
        }