private static void EnqueueCoverRequest(AudioAlbum target)
{
lock (_syncRoot)
{
if (_requestQueue.ContainsKey(target.Id))
{
if (_requestQueue[target.Id].All(t => t != target))
_requestQueue[target.Id].Add(target);
}
else
{
_requestQueue.Add(target.Id, new List<AudioAlbum>() { target });
}
}
if (!_isQueueWorking)
Task.Run(() => StartQueueProcessing()); //вся обработка очереди производится в 1 потоке
}
private async Task LoadSelectedArtist()
{
if (SelectedArtist == null)
return;
OnTaskStarted("artists");
try
{
if (Albums.IsNullOrEmpty())
await LoadAlbums();
var albums = await ServiceLocator.LocalMusicService.GetArtistAlbums(SelectedArtist.Id);
if (!albums.IsNullOrEmpty())
{
foreach (var album in albums)
{
var tracks = await ServiceLocator.LocalMusicService.GetAlbumTracks(album.Id);
if (!tracks.IsNullOrEmpty())
album.Tracks = tracks.Cast<Audio>().ToList();
}
}
else
{
albums = new List<AudioAlbum>();
}
if (SelectedArtist == null)
return;
var unsortedTracks = await ServiceLocator.LocalMusicService.GetArtistUnsortedTracks(SelectedArtist.Id);
if (!unsortedTracks.IsNullOrEmpty())
{
var unsortedAlbum = new AudioAlbum() { Tracks = unsortedTracks.OfType<Audio>().ToList() };
albums.Insert(0, unsortedAlbum);
}
SelectedArtistAlbums = albums;
SelectedArtistTracks = albums.SelectMany(a => a.Tracks).Cast<LocalAudio>().ToList();
}
catch (Exception ex)
{
OnTaskError("artists", ErrorResources.LoadArtistsErrorCommon);
LoggingService.Log(ex);
}
OnTaskFinished("artists");
}
/// <summary>
/// Ставит трек в очередь на получение обложки. Когда очередь подойдет, треку будет присвоена обложка.
/// </summary>
/// <param name="target"></param>
public static void RequestCover(AudioAlbum target)
{
//ставим трек в очередь и сразу возвращаем null
EnqueueCoverRequest(target);
}
/// <summary>
/// Получить обложку
/// </summary>
/// <param name="target"></param>
public static Task<ImageSource> GetCover(AudioAlbum target)
{
return GetImage(target.CoverPath);
}
private bool UpdateAlbum(AudioAlbum cachedAlbum, AudioAlbum updatedAlbum)
{
bool changed = false;
if (cachedAlbum.Title != updatedAlbum.Title)
{
cachedAlbum.Title = updatedAlbum.Title;
changed = true;
}
if (cachedAlbum.Artist != updatedAlbum.Artist)
{
cachedAlbum.Artist = updatedAlbum.Artist;
changed = true;
}
if (cachedAlbum.ArtistId != updatedAlbum.ArtistId)
{
cachedAlbum.ArtistId = updatedAlbum.ArtistId;
changed = true;
}
if (cachedAlbum.CoverPath != updatedAlbum.CoverPath)
{
cachedAlbum.CoverPath = updatedAlbum.CoverPath;
changed = true;
}
if (cachedAlbum.Year != updatedAlbum.Year)
{
cachedAlbum.Year = updatedAlbum.Year;
changed = true;
}
return changed;
}