public TryDownloadResult TryDownload(FormatObject lastDownloadedFormat = default(FormatObject))
{
FileInfo lastDestinationFile = default(FileInfo);
DateTimeOffset lastAttemptedDateTime = DateTimeOffset.MinValue;
FormatObject lastAttemptedFormatObject = default(FormatObject);
foreach (var formatObject in FormatIterator.GetNextCandidates(lastDownloadedFormat))
{
lastAttemptedDateTime = Source.GetUpperBoundExclusive(formatObject);
lastAttemptedFormatObject = formatObject;
if ((string.IsNullOrWhiteSpace(Source.UriFormat)) || (string.IsNullOrWhiteSpace(Source.FilenameFormat)))
{
continue;
}
Uri uri = new Uri(Source.UriFormat.FormatWith(formatObject));
FileInfo destinationFile = new FileInfo(Path.Combine(
DownloadLocation.FullName,
string.Format("{0}_{1}", Source.SourceName, Source.FilenameFormat.FormatWith(formatObject))));
try
{
var response = WebClient.DownloadFile(uri, destinationFile.FullName);
if (Source.IsValidFile(response))
{
lastDestinationFile = destinationFile;
return(new TryDownloadResult()
{
IsSuccess = true,
FormatObject = formatObject,
DestinationFile = lastDestinationFile,
UpperBoundExclusive = lastAttemptedDateTime,
});
}
}
catch (System.Net.WebException)
{
// Do nothing - try the next candidate until one is available
}
}
return(new TryDownloadResult()
{
IsSuccess = false,
FormatObject = lastAttemptedFormatObject,
DestinationFile = default(FileInfo),
UpperBoundExclusive = lastAttemptedDateTime,
});
}
public DownloadAggregatorResult DownloadNext(FormatObject lastDownloadedFormat)
{
var aggregateResult = new DownloadAggregatorResult()
{
IsSuccess = false,
CurrentPosition = lastDownloadedFormat,
};
foreach (var formatObject in FormatIterator.GetNextCandidates(lastDownloadedFormat))
{
aggregateResult.CurrentPosition = formatObject;
var result = Downloader.TryDownload(formatObject);
if (result.IsSuccess)
{
aggregateResult.CurrentPosition = formatObject;
if (!(CurrentAggregatedFiles.Any(x => x.Item2 == result.DestinationFile)))
{
CurrentAggregatedFiles.Enqueue(Tuple.Create(formatObject, result.DestinationFile));
if (CurrentAggregatedFiles.Count > NumberOfFilesToAggregate)
{
CurrentAggregatedFiles.Dequeue();
}
if (CurrentAggregatedFiles.Count == NumberOfFilesToAggregate)
{
aggregateResult.IsSuccess = true;
aggregateResult.DestinationFiles = CurrentAggregatedFiles.Select(x => x.Item2).ToArray();
CurrentAggregatedFiles.Dequeue();
break;
}
}
}
}
return(aggregateResult);
}
