private async Task HandleUnsuccessfulDelivery(ParallelOptions options, T message, ParallelLoopState state)
{
if (RetryPolicy == null)
{
HandleUndeliverable(message);
return;
}
var hash = HashMessage(message);
var attempts = IncrementAttempts(hash);
var decision = RetryPolicy.DecideOn(message, attempts);
switch (decision)
{
case RetryDecision.RetryImmediately:
await ProductionCycle(options, message, state);
break;
case RetryDecision.Requeue:
if (!_buffer.IsAddingCompleted && RetryPolicy?.RequeueInterval != null)
{
Produce(Observable.Return(message).Delay(RetryPolicy.RequeueInterval(attempts)));
}
else
{
Produce(message);
}
break;
case RetryDecision.Backlog:
HandleBacklog(message);
break;
case RetryDecision.Undeliverable:
HandleUndeliverable(message);
break;
case RetryDecision.Destroy:
break;
default:
throw new ArgumentOutOfRangeException();
}
}