private static void EnqueueCoverRequest(AudioArtist 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<AudioArtist>() { target });
}
}
if (!_isQueueWorking)
Task.Run(() => StartQueueProcessing()); //вся обработка очереди производится в 1 потоке
}
private async Task LoadArtists(CancellationToken token)
{
var audio = await DataService.GetUserTracks();
if (audio.Items == null || token.IsCancellationRequested)
{
return;
}
var tracks = audio.Items;
try
{
var artists = await DataService.GetArtistsFromTracks(tracks, token);
if (artists != null)
{
Artists = new ObservableCollection<AudioArtist>(artists);
SelectedArtist = Artists.FirstOrDefault();
}
}
catch (Exception ex)
{
LoggingService.Log(ex);
}
}
private async void SearchLocalArtists(CancellationToken token)
{
SearchResults = null;
OnTaskStarted("results");
SearchResults = null;
try
{
var artists = await ServiceLocator.LocalMusicService.SearchArtists(_query);
if (token.IsCancellationRequested)
{
Debug.WriteLine("Local artists search cancelled");
return;
}
if (artists != null && artists.Count > 0)
{
var results = new List<AudioArtist>();
foreach (var artist in artists)
{
var a = new AudioArtist(){Title = artist.Title};
var albums = await ServiceLocator.LocalMusicService.GetArtistAlbums(artist.Id);
if (token.IsCancellationRequested)
{
Debug.WriteLine("Local artists search cancelled");
return;
}
if (!albums.IsNullOrEmpty())
{
foreach (var album in albums)
{
var tracks = await ServiceLocator.LocalMusicService.GetAlbumTracks(album.Id);
if (token.IsCancellationRequested)
{
Debug.WriteLine("Local artists search cancelled");
return;
}
if (!tracks.IsNullOrEmpty())
album.Tracks = tracks.Cast<Audio>().ToList();
}
}
a.Albums = albums;
results.Add(a);
}
SearchResults = new ObservableCollection<object>(results);
}
else
{
OnTaskError("results", ErrorResources.LoadSearchErrorEmpty);
}
}
catch (Exception ex)
{
LoggingService.Log(ex);
OnTaskError("results", ErrorResources.LoadSearchErrorCommon);
}
OnTaskFinished("results");
}
private bool UpdateArtist(AudioArtist cachedArtist, AudioArtist updatedArtist)
{
bool changed = false;
if (!cachedArtist.Title.Equals(updatedArtist.Title, StringComparison.OrdinalIgnoreCase))
{
cachedArtist.Title = updatedArtist.Title;
changed = true;
}
return changed;
}
public static Task<List<AudioArtist>> GetArtistsFromTracks(IEnumerable<Audio> tracks, CancellationToken token)
{
return Task.Run(() =>
{
var artists = new Dictionary<string, AudioArtist>();
foreach (var track in tracks)
{
if (token.IsCancellationRequested)
break;
//parse artist
var artistName = track.Artist;
var artistId = Md5Helper.Md5(artistName.ToLowerInvariant()); //artistid = md5(artistName)
if (!artists.ContainsKey(artistId))
{
var artist = new AudioArtist();
artist.Id = artistId;
artist.Title = artistName;
artists.Add(artistId, artist);
}
artists[artistId].Tracks.Add(track);
}
return artists.Values.OrderBy(a => a.Title).ToList();
});
}
/// <summary>
/// Получить обложку
/// </summary>
/// <param name="target"></param>
public static Task<ImageSource> GetCover(AudioArtist target)
{
return GetImage(target.Title);
}
/// <summary>
/// Ставит трек в очередь на получение обложки. Когда очередь подойдет, треку будет присвоена обложка.
/// </summary>
/// <param name="target"></param>
public static void RequestCover(AudioArtist target)
{
//ставим трек в очередь и сразу возвращаем null
EnqueueCoverRequest(target);
}