public async Task <MediaThumbnail?> GetThumbnailAsync(
Album album,
ThumbnailSizeName size,
CancellationToken cancellationToken)
{
Guid?mediaId;
if (album.CoverMediaId.HasValue)
{
mediaId = album.CoverMediaId.Value;
}
else
{
mediaId = (await GetMediaIdsAsync(album, cancellationToken))
.FirstOrDefault();
}
if (mediaId.HasValue)
{
IReadOnlyDictionary <Guid, MediaThumbnail>?thumbs = await _mediaStore
.GetThumbnailsByMediaIdsAsync(
new[] { mediaId.Value },
size,
cancellationToken);
return(thumbs.Values.FirstOrDefault());
}
return(null);
}
protected async override Task <IReadOnlyDictionary <Tuple <Guid, ThumbnailSizeName>, MediaThumbnail> > LoadBatchAsync(
IReadOnlyList <Tuple <Guid, ThumbnailSizeName> > keys,
CancellationToken cancellationToken)
{
ThumbnailSizeName size = keys.First().Item2;
IReadOnlyDictionary <Guid, MediaThumbnail> thumbs = await _mediaStore
.GetThumbnailsByMediaIdsAsync(
keys.Select(x => x.Item1),
size,
cancellationToken);
return(thumbs.ToDictionary(k => new Tuple <Guid, ThumbnailSizeName>(k.Key, size), v => v.Value));
}
