Esempio n. 1
0
        private async Task FetchAndProcess(TimeSpan startupDelay, CancellationToken cancellationToken)
        {
            var numberRetrievedInLastBatch = 0;

            if (startupDelay > TimeSpan.Zero)
            {
                await Task.Delay(startupDelay).ConfigureAwait(false);
            }

            while (!cancellationToken.IsCancellationRequested)
            {
                try
                {
                    var messages = await messageSource
                                   .WaitForNextMessageBatch(
                        batchSizeProvider.CalculateNewRecommendedBatchSize(numberRetrievedInLastBatch),
                        cancellationToken)
                                   .ConfigureAwait(false);

                    numberRetrievedInLastBatch = messages?.Count ?? 0;

                    await pipeline
                    .Process(messages, cancellationToken)
                    .ConfigureAwait(false);
                }
                catch (TaskCanceledException)
                {
                    break;
                }
                catch (Exception exception)
                {
                    // Cannot stop the loop as a subscriber would silently just fail.  Need to log and try again.
                    logger.LogError(exception, "Unhandled exception when checking for messages.");
                }
            }
        }