private void ProcessMarketDataMessage(MarketDataMessage message) { var securityId = message.SecurityId; var subscribersCount = _subscribers .SafeAdd(message.DataType) .ChangeSubscribers(securityId, message.IsSubscribe); if (subscribersCount > 1) { var msg = new MarketDataMessage { DataType = message.DataType, IsSubscribe = message.IsSubscribe, SecurityId = securityId, }; message.CopyTo(msg); RaiseNewOutMessage(msg); } else { base.SendInMessage(message); } }