public async Task <AuxiliaryFileResult <PopularityTransferData> > ReadLatestIndexedAsync( IAccessCondition accessCondition, StringCache stringCache) { var stopwatch = Stopwatch.StartNew(); var blobName = GetLatestIndexedBlobName(); var blobReference = Container.GetBlobReference(blobName); _logger.LogInformation("Reading the latest indexed popularity transfers from {BlobName}.", blobName); bool modified; var data = new PopularityTransferData(); AuxiliaryFileMetadata metadata; try { using (var stream = await blobReference.OpenReadAsync(accessCondition)) { ReadStream(stream, (from, to) => data.AddTransfer(stringCache.Dedupe(from), stringCache.Dedupe(to))); modified = true; metadata = new AuxiliaryFileMetadata( lastModified: new DateTimeOffset(blobReference.LastModifiedUtc, TimeSpan.Zero), loadDuration: stopwatch.Elapsed, fileSize: blobReference.Properties.Length, etag: blobReference.ETag); } } catch (StorageException ex) when(ex.RequestInformation.HttpStatusCode == (int)HttpStatusCode.NotModified) { _logger.LogInformation("The blob {BlobName} has not changed.", blobName); modified = false; data = null; metadata = null; } stopwatch.Stop(); _telemetryService.TrackReadLatestIndexedPopularityTransfers(data?.Count, modified, stopwatch.Elapsed); return(new AuxiliaryFileResult <PopularityTransferData>( modified, data, metadata)); }