private static List <Chapter> DownloadChaptersWork(String bookID, List <String> fileUrlsToDownload)
{
// If chapters are not downloaded yet or expired, download them again
List <Chapter> chapterList = null;
if (!BooksOnServerAccessor.HasChapters(bookID) || CurrentBook.Status == Book.BookStatus.UPDATING)
{
chapterList = eBriefingService.StartDownloadChapters(bookID);
if (chapterList != null)
{
BooksOnServerAccessor.SaveChapters(bookID, chapterList);
}
}
else
{
// Or get them from the cache
chapterList = BooksOnServerAccessor.GetChapters(bookID);
}
// Queue up cover images for the chapter only if the image version is different
if (chapterList != null)
{
foreach (Chapter serverCh in chapterList)
{
// Remove cover image if this is an update
bool download = false;
if (CurrentBook.Status == Book.BookStatus.UPDATING)
{
Chapter deviceCh = BooksOnDeviceAccessor.GetChapter(CurrentBook.ID, serverCh.ID);
if (deviceCh == null)
{
download = true;
}
else if (serverCh.ImageVersion != deviceCh.ImageVersion)
{
DownloadedFilesCache.RemoveFile(deviceCh.LargeImageURL);
DownloadedFilesCache.RemoveFile(deviceCh.SmallImageURL);
download = true;
}
}
else
{
download = true;
}
if (download)
{
fileUrlsToDownload.Add(serverCh.LargeImageURL);
fileUrlsToDownload.Add(serverCh.SmallImageURL);
}
}
}
return(chapterList);
}
async private void RetrieveChapters()
{
// Update cover image
UpdateImage();
List <Chapter> chapterList = await eBriefingService.Run(() => eBriefingService.StartDownloadChapters(book.ID));
if (chapterList != null)
{
// Save in the cache
BooksOnServerAccessor.SaveChapters(book.ID, chapterList);
// Update UI
UpdateUI();
// Enable segmentedControl
segmentedControl.Enabled = true;
spinner2.StopAnimating();
}
}