public IDownload DownloadFile(string url, string assetFilename = null)
{
Tuple <IDisposable, IDownload> currentDownload;
if (CurrentDownloadDictionary.TryGetValue(url, out currentDownload))
{
return(currentDownload.Item2);
}
if (assetFilename != null)
{
var duplicateFile = DownloadQueue.FirstOrDefault(x => x.FileIdentifier == assetFilename);
if (duplicateFile != null)
{
return(duplicateFile);
}
}
Download download = new Download(url, assetFilename ?? Guid.NewGuid().ToString());
download.Status = DownloadStatus.Queued;
Debug.WriteLine($"Enqueue: {download.FileIdentifier}");
DownloadQueue.Enqueue(download);
_downloadUpdateSubject.OnNext(download);
StartQueue();
return(download);
}
public void CancelDownload(string url)
{
Tuple <IDisposable, IDownload> currentDownload;
if (CurrentDownloadDictionary.TryGetValue(url, out currentDownload))
{
currentDownload.Item1.Dispose();
}
var downloads = _downloads.Where(x => x.Url == url).ToList();
foreach (var download in downloads)
{
((Download)download).Status = DownloadStatus.Cancelled;
_downloads.Remove(download);
}
}
public void ProcessQueue()
{
if (_downloads.Count >= NumberOfConcurrentDownloads)
{
return;
}
IDownload outDownload;
if (!DownloadQueue.TryDequeue(out outDownload))
{
return;
}
Debug.WriteLine($"Deque: {outDownload.FileIdentifier}");
// If the download has been cancelled we skip it
if (outDownload.Status == DownloadStatus.Cancelled)
{
return;
}
var download = (Download)outDownload;
_downloads.Add(outDownload);
download.Status = DownloadStatus.InProgress;
Debug.WriteLine($"Download Start: {download.FileIdentifier}");
TaskCompletionSource <bool> taskCompletionSource = new TaskCompletionSource <bool>();
IObservable <double> downloadFileObservable = HttpService.DownloadFileAsync(download.Url, download.FileIdentifier, _storage.GetOutputStream(download.FileIdentifier));
IDisposable disposable = downloadFileObservable.Subscribe(d => {
download.ProgressSubject.OnNext(d);
}, exception => {
Debug.WriteLine($"Download Error: {download.FileIdentifier}");
download.ErrorCount++;
if (download.ErrorCount >= 3)
{
Debug.WriteLine($"Download Error Remove: {download.FileIdentifier}");
download.Status = DownloadStatus.Failed;
_downloadUpdateSubject.OnNext(download);
download.ProgressSubject.OnError(exception);
_progressSubject.OnNext(DownloadQueue.Count + CurrentDownloadDictionary.Count);
}
else
{
Debug.WriteLine($"Download Error Qeueu: {download.FileIdentifier}");
// Download failed so we add it to queue again
download.Status = DownloadStatus.Queued;
_downloadUpdateSubject.OnNext(download);
DownloadQueue.Enqueue(download);
}
Tuple <IDisposable, IDownload> compeltedDownload;
CurrentDownloadDictionary.TryRemove(download.Url, out compeltedDownload);
_downloads.Remove(download);
StartQueue();
}, () => {
Debug.WriteLine($"Download Complete: {download.FileIdentifier}");
_downloads.Remove(download);
download.Status = DownloadStatus.Complete;
_downloadUpdateSubject.OnNext(download);
taskCompletionSource.TrySetResult(true);
download.ProgressSubject.OnCompleted();
Tuple <IDisposable, IDownload> compeltedDownload;
CurrentDownloadDictionary.TryRemove(download.Url, out compeltedDownload);
_progressSubject.OnNext(DownloadQueue.Count + CurrentDownloadDictionary.Count);
StartQueue();
});
if (!CurrentDownloadDictionary.TryAdd(download.Url, new Tuple <IDisposable, IDownload>(disposable, download)))
{
throw new Exception("Could not add download to dictionary");
}
//while (Downloads.Count(x => x.Status == DownloadStatus.InProgress) >= NumberOfConcurrentDownloads) {
// Debug.WriteLine("Start wait");
// await taskCompletionSource.Task;
// Debug.WriteLine("End wait");
//}
StartQueue();
}
