public async Task <PullResult> Pull(ChannelClient client, TmqMessage request)
{
QueueMessage message = _queue.FindNextMessage();
if (message == null)
{
await client.Client.SendAsync(MessageBuilder.ResponseStatus(request, KnownContentTypes.NotFound));
return(PullResult.Empty);
}
ProcessingMessage = message;
message.Decision = await _queue.DeliveryHandler.BeginSend(_queue, message);
if (!await _queue.ApplyDecision(message.Decision, message))
{
return(PullResult.Success);
}
//call before send and check decision
message.Decision = await _queue.DeliveryHandler.CanConsumerReceive(_queue, message, client.Client);
if (!await _queue.ApplyDecision(message.Decision, message))
{
return(PullResult.Success);
}
//create delivery object
MessageDelivery delivery = new MessageDelivery(message, client);
//change to response message, send, change back to channel message
message.Message.SetMessageId(request.MessageId);
bool sent = client.Client.Send(message.Message);
if (sent)
{
delivery.MarkAsSent();
//do after send operations for per message
_queue.Info.AddDelivery();
message.Decision = await _queue.DeliveryHandler.ConsumerReceived(_queue, delivery, client.Client);
//after all sending operations completed, calls implementation send completed method and complete the operation
_queue.Info.AddMessageSend();
if (!await _queue.ApplyDecision(message.Decision, message))
{
return(PullResult.Success);
}
}
else
{
message.Decision = await _queue.DeliveryHandler.ConsumerReceiveFailed(_queue, delivery, client.Client);
if (!await _queue.ApplyDecision(message.Decision, message))
{
return(PullResult.Success);
}
}
message.Decision = await _queue.DeliveryHandler.EndSend(_queue, message);
await _queue.ApplyDecision(message.Decision, message);
return(PullResult.Success);
}