public Task AddAsync(CachedAlbumArt cache)
{
return(this.Connection.InsertAsync(cache));
}
public async Task <string> GetCachedImageAsync(Uri url, uint size)
{
await this.InitializeCacheFolderAsync();
CachedAlbumArt cache = await this.cachedAlbumArtsRepository.FindAsync(url, size);
if (cache == null && this.stateService.IsOffline())
{
return(null);
}
if (cache == null)
{
await this.semaphoreSlim.WaitAsync().ConfigureAwait(continueOnCapturedContext: false);
try
{
var cachedKey = new CachedKey(url, size);
cache = await this.downloadTasks.GetOrAdd(
cachedKey,
uri => Task.Run(
async() =>
{
CachedAlbumArt downloadedCache = await this.cachedAlbumArtsRepository.FindAsync(url, size);
if (downloadedCache == null)
{
string fileName = Guid.NewGuid().ToString();
string subFolderName = fileName.Substring(0, 1);
var folder = await this.cacheFolder.CreateFolderAsync(subFolderName, CreationCollisionOption.OpenIfExists);
var file = await folder.CreateFileAsync(fileName);
using (var imageStream = await this.httpClient.GetStreamAsync(url.ChangeSize(size)))
{
using (var targetStream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
using (Stream fileStream = targetStream.AsStreamForWrite())
{
await imageStream.CopyToAsync(fileStream);
await fileStream.FlushAsync();
}
}
}
downloadedCache = new CachedAlbumArt()
{
AlbumArtUrl = url, Size = size, FileName = fileName
};
await this.cachedAlbumArtsRepository.AddAsync(downloadedCache);
}
return(downloadedCache);
}));
Task <CachedAlbumArt> task;
this.downloadTasks.TryRemove(cachedKey, out task);
}
finally
{
this.semaphoreSlim.Release(1);
}
}
return(Path.Combine(AlbumArtCacheFolder, cache.FileName.Substring(0, 1), cache.FileName));
}
