private async Task <PushResult> ProcessMessage(QueueMessage message) { //if we need acknowledge from receiver, it has a deadline. DateTime?ackDeadline = null; if (_queue.Options.RequestAcknowledge) { ackDeadline = DateTime.UtcNow.Add(_queue.Options.AcknowledgeTimeout); } //if there are not receivers, complete send operation List <ChannelClient> clients = _queue.Channel.ClientsClone; if (clients.Count == 0) { _queue.AddMessage(message, false); return(PushResult.NoConsumers); } //if to process next message is requires previous message acknowledge, wait here if (_queue.Options.RequestAcknowledge && _queue.Options.WaitForAcknowledge) { await _queue.WaitForAcknowledge(message); } message.Decision = await _queue.DeliveryHandler.BeginSend(_queue, message); if (!await _queue.ApplyDecision(message.Decision, message)) { return(PushResult.Success); } //create prepared message data byte[] messageData = await _writer.Create(message.Message); Decision final = new Decision(false, false, false, DeliveryAcknowledgeDecision.None); bool messageIsSent = false; //to all receivers foreach (ChannelClient client in clients) { //to only online receivers if (!client.Client.IsConnected) { continue; } //somehow if code comes here (it should not cuz of last "break" in this foreach, break if (!message.Message.FirstAcquirer && _queue.Options.SendOnlyFirstAcquirer) { break; } //call before send and check decision Decision ccrd = await _queue.DeliveryHandler.CanConsumerReceive(_queue, message, client.Client); final = ChannelQueue.CreateFinalDecision(final, ccrd); if (!ccrd.Allow) { continue; } //create delivery object MessageDelivery delivery = new MessageDelivery(message, client, ackDeadline); delivery.FirstAcquirer = message.Message.FirstAcquirer; //send the message bool sent = client.Client.Send(messageData); if (sent) { messageIsSent = true; //adds the delivery to time keeper to check timing up _queue.TimeKeeper.AddAcknowledgeCheck(delivery); //set as sent, if message is sent to it's first acquirer, //set message first acquirer false and re-create byte array data of the message bool firstAcquirer = message.Message.FirstAcquirer; //mark message is sent delivery.MarkAsSent(); //do after send operations for per message _queue.Info.AddDelivery(); Decision d = await _queue.DeliveryHandler.ConsumerReceived(_queue, delivery, client.Client); final = ChannelQueue.CreateFinalDecision(final, d); //if we are sending to only first acquirer, break if (_queue.Options.SendOnlyFirstAcquirer && firstAcquirer) { break; } if (firstAcquirer && clients.Count > 1) { messageData = await _writer.Create(message.Message); } } else { Decision d = await _queue.DeliveryHandler.ConsumerReceiveFailed(_queue, delivery, client.Client); final = ChannelQueue.CreateFinalDecision(final, d); } } message.Decision = final; if (!await _queue.ApplyDecision(final, message)) { return(PushResult.Success); } //after all sending operations completed, calls implementation send completed method and complete the operation if (messageIsSent) { _queue.Info.AddMessageSend(); } message.Decision = await _queue.DeliveryHandler.EndSend(_queue, message); await _queue.ApplyDecision(message.Decision, message); if (message.Decision.Allow && !message.Decision.KeepMessage) { _queue.Info.AddMessageRemove(); _ = _queue.DeliveryHandler.MessageRemoved(_queue, message); } return(PushResult.Success); }