more task reduction

MediaBrowser.Controller/Providers/BaseItemXmlParser.cs

@@ -54,7 +54,6 @@ namespace MediaBrowser.Controller.Providers
                 CheckCharacters = false,
                 IgnoreProcessingInstructions = true,
                 IgnoreComments = true,
-                IgnoreWhitespace = true,
                 ValidationType = ValidationType.None
             };
 

MediaBrowser.Controller/Providers/BaseMetadataProvider.cs

@@ -31,6 +31,12 @@ namespace MediaBrowser.Controller.Providers
         /// </summary>
         protected readonly Guid Id;
 
+        /// <summary>
+        /// The true task result
+        /// </summary>
+        protected static readonly Task<bool> TrueTaskResult = Task.FromResult(true);
+        protected static readonly Task<bool> FalseTaskResult = Task.FromResult(false);
+
         protected static readonly SemaphoreSlim XmlParsingResourcePool = new SemaphoreSlim(5, 5);
         
         /// <summary>
@@ -207,7 +213,7 @@ namespace MediaBrowser.Controller.Providers
                 return true;
             }
 
-            if (RefreshOnVersionChange && !string.Equals(ProviderVersion, providerInfo.ProviderVersion))
+            if (RefreshOnVersionChange && !String.Equals(ProviderVersion, providerInfo.ProviderVersion))
             {
                 return true;
             }
@@ -223,7 +229,7 @@ namespace MediaBrowser.Controller.Providers
         /// <returns><c>true</c> if [has file system stamp changed] [the specified item]; otherwise, <c>false</c>.</returns>
         protected bool HasFileSystemStampChanged(BaseItem item, BaseProviderInfo providerInfo)
         {
-            return !string.Equals(GetCurrentFileSystemStamp(item), providerInfo.FileSystemStamp);
+            return !String.Equals(GetCurrentFileSystemStamp(item), providerInfo.FileSystemStamp);
         }
 
         /// <summary>

MediaBrowser.Controller/Providers/ImageFromMediaLocationProvider.cs

@@ -52,11 +52,6 @@ namespace MediaBrowser.Controller.Providers
             }
         }
 
-        /// <summary>
-        /// The true task result
-        /// </summary>
-        protected static readonly Task<bool> TrueTaskResult = Task.FromResult(true);
-
         /// <summary>
         /// Fetches metadata and returns true or false indicating if any work that requires persistence was done
         /// </summary>

MediaBrowser.Controller/Providers/Movies/MovieProviderFromJson.cs

@@ -80,9 +80,6 @@ namespace MediaBrowser.Controller.Providers.Movies
         /// <param name="cancellationToken">The cancellation token.</param>
         /// <returns>Task{System.Boolean}.</returns>
         public override Task<bool> FetchAsync(BaseItem item, bool force, CancellationToken cancellationToken)
-        {
-            // Since we don't have anything truly async, and since deserializing can be expensive, create a task to force parallelism
-            return Task.Run(() =>
         {
             cancellationToken.ThrowIfCancellationRequested();
 
@@ -97,10 +94,9 @@ namespace MediaBrowser.Controller.Providers.Movies
                 ProcessMainInfo(item, movieData);
 
                 SetLastRefreshed(item, DateTime.UtcNow);
-                    return true;
+                return TrueTaskResult;
             }
-                return false;
+            return FalseTaskResult;
-            });
         }
     }
 }

MediaBrowser.Controller/Providers/Movies/PersonProviderFromJson.cs

@@ -91,8 +91,6 @@ namespace MediaBrowser.Controller.Providers.Movies
         /// <param name="cancellationToken">The cancellation token.</param>
         /// <returns>Task{System.Boolean}.</returns>
         public override Task<bool> FetchAsync(BaseItem item, bool force, CancellationToken cancellationToken)
-        {
-            return Task.Run(() =>
         {
             cancellationToken.ThrowIfCancellationRequested();
 
@@ -105,15 +103,13 @@ namespace MediaBrowser.Controller.Providers.Movies
                 ProcessInfo((Person)item, personInfo);
 
                 SetLastRefreshed(item, DateTime.UtcNow);
-                    return true;
+                return TrueTaskResult;
             }
             catch (FileNotFoundException)
             {
                 // This is okay - just means we force refreshed and there isn't a json file
-                    return false;
+                return FalseTaskResult;
             }
-
-            });
         }
     }
 }

MediaBrowser.Controller/Providers/Music/MusicArtistProviderFromJson.cs

@@ -31,8 +31,6 @@ namespace MediaBrowser.Controller.Providers.Music
         }
 
         public override Task<bool> FetchAsync(BaseItem item, bool force, CancellationToken cancellationToken)
-        {
-            return Task.Run(() =>
         {
             cancellationToken.ThrowIfCancellationRequested();
 
@@ -49,10 +47,9 @@ namespace MediaBrowser.Controller.Providers.Music
                 item.SetProviderId(MetadataProviders.Musicbrainz, data.mbid);
 
                 SetLastRefreshed(item, DateTime.UtcNow);
-                    return true;
+                return TrueTaskResult;
             }
-                return false;
+            return FalseTaskResult;
-            });
         }
 
         public override MetadataProviderPriority Priority

MediaBrowser.Server.Implementations/ScheduledTasks/VideoImagesTask.cs

@@ -3,6 +3,7 @@ using MediaBrowser.Common.MediaInfo;
 using MediaBrowser.Common.ScheduledTasks;
 using MediaBrowser.Controller;
 using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Entities.Movies;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.Providers.MediaInfo;
 using MediaBrowser.Model.Entities;
@@ -95,9 +96,17 @@ namespace MediaBrowser.Server.Implementations.ScheduledTasks
         /// <returns>Task.</returns>
         public async Task Execute(CancellationToken cancellationToken, IProgress<double> progress)
         {
-            var items = _libraryManager.RootFolder.RecursiveChildren
+            var allItems = _libraryManager.RootFolder.RecursiveChildren.ToList();
-                .OfType<Video>()
+
-                .Where(i =>
+            var localTrailers = allItems.SelectMany(i => i.LocalTrailers);
+
+            var videos = allItems.OfType<Video>().ToList();
+
+            var items = videos;
+            items.AddRange(localTrailers);
+            items.AddRange(videos.OfType<Movie>().SelectMany(i => i.SpecialFeatures).ToList());
+
+            items = items.Where(i =>
             {
                 if (!string.IsNullOrEmpty(i.PrimaryImagePath))
                 {
@@ -120,8 +129,7 @@ namespace MediaBrowser.Server.Implementations.ScheduledTasks
                 }
 
                 return i.MediaStreams != null && i.MediaStreams.Any(m => m.Type == MediaStreamType.Video);
-                    })
+            }).ToList();
-                .ToList();
 
             progress.Report(0);
 

MediaBrowser.Server.Implementations/Sqlite/SQLiteDisplayPreferencesRepository.cs

@@ -86,7 +86,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
         {
             var dbFile = Path.Combine(_appPaths.DataPath, "displaypreferences.db");
 
-            await ConnectToDB(dbFile).ConfigureAwait(false);
+            await ConnectToDb(dbFile).ConfigureAwait(false);
 
             string[] queries = {
 

MediaBrowser.Server.Implementations/Sqlite/SQLiteItemRepository.cs

@@ -82,7 +82,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
         {
             var dbFile = Path.Combine(_appPaths.DataPath, "library.db");
 
-            await ConnectToDB(dbFile).ConfigureAwait(false);
+            await ConnectToDb(dbFile).ConfigureAwait(false);
 
             string[] queries = {
 

MediaBrowser.Server.Implementations/Sqlite/SQLiteRepository.cs

@@ -76,7 +76,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
         /// <param name="dbPath">The db path.</param>
         /// <returns>Task{System.Boolean}.</returns>
         /// <exception cref="System.ArgumentNullException">dbPath</exception>
-        protected async Task ConnectToDB(string dbPath)
+        protected async Task ConnectToDb(string dbPath)
         {
             if (string.IsNullOrEmpty(dbPath))
             {

MediaBrowser.Server.Implementations/Sqlite/SQLiteUserDataRepository.cs

@@ -86,7 +86,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
         {
             var dbFile = Path.Combine(_appPaths.DataPath, "userdata.db");
 
-            await ConnectToDB(dbFile).ConfigureAwait(false);
+            await ConnectToDb(dbFile).ConfigureAwait(false);
 
             string[] queries = {
 

MediaBrowser.Server.Implementations/Sqlite/SQLiteUserRepository.cs

@@ -88,7 +88,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
         {
             var dbFile = Path.Combine(_appPaths.DataPath, "users.db");
 
-            await ConnectToDB(dbFile).ConfigureAwait(false);
+            await ConnectToDb(dbFile).ConfigureAwait(false);
 
             string[] queries = {