Added a display preferences manager

1 files changed, 93 insertions, 0 deletions

diff --git a/MediaBrowser.Server.Implementations/Library/DisplayPreferencesManager.cs b/MediaBrowser.Server.Implementations/Library/DisplayPreferencesManager.cs
new file mode 100644
index 000000000..a8e51a75b
--- /dev/null
+++ b/MediaBrowser.Server.Implementations/Library/DisplayPreferencesManager.cs
@@ -0,0 +1,93 @@
+using MediaBrowser.Controller;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.Logging;
+using System;
+using System.Collections.Concurrent;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Server.Implementations.Library
+{
+    /// <summary>
+    /// Class DisplayPreferencesManager
+    /// </summary>
+    public class DisplayPreferencesManager : IDisplayPreferencesManager
+    {
+        /// <summary>
+        /// The _logger
+        /// </summary>
+        private readonly ILogger _logger;
+
+        /// <summary>
+        /// The _display preferences
+        /// </summary>
+        private readonly ConcurrentDictionary<Guid, Task<DisplayPreferences>> _displayPreferences = new ConcurrentDictionary<Guid, Task<DisplayPreferences>>();
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DisplayPreferencesManager"/> class.
+        /// </summary>
+        /// <param name="logger">The logger.</param>
+        public DisplayPreferencesManager(ILogger logger)
+        {
+            _logger = logger;
+        }
+
+        /// <summary>
+        /// Gets the display preferences.
+        /// </summary>
+        /// <param name="displayPreferencesId">The display preferences id.</param>
+        /// <returns>DisplayPreferences.</returns>
+        public Task<DisplayPreferences> GetDisplayPreferences(Guid displayPreferencesId)
+        {
+            return _displayPreferences.GetOrAdd(displayPreferencesId, keyName => RetrieveDisplayPreferences(displayPreferencesId));
+        }
+
+        /// <summary>
+        /// Retrieves the display preferences.
+        /// </summary>
+        /// <param name="displayPreferencesId">The display preferences id.</param>
+        /// <returns>DisplayPreferences.</returns>
+        private async Task<DisplayPreferences> RetrieveDisplayPreferences(Guid displayPreferencesId)
+        {
+            var displayPreferences = await Kernel.Instance.DisplayPreferencesRepository.GetDisplayPreferences(displayPreferencesId).ConfigureAwait(false);
+
+            return displayPreferences ?? new DisplayPreferences { Id = displayPreferencesId };
+        }
+
+        /// <summary>
+        /// Saves display preferences for an item
+        /// </summary>
+        /// <param name="displayPreferences">The display preferences.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        public async Task SaveDisplayPreferences(DisplayPreferences displayPreferences, CancellationToken cancellationToken)
+        {
+            if (displayPreferences == null)
+            {
+                throw new ArgumentNullException("displayPreferences");
+            }
+            if (displayPreferences.Id == Guid.Empty)
+            {
+                throw new ArgumentNullException("displayPreferences.Id");
+            }
+
+            try
+            {
+                await Kernel.Instance.DisplayPreferencesRepository.SaveDisplayPreferences(displayPreferences,
+                                                                                        cancellationToken).ConfigureAwait(false);
+
+                var newValue = Task.FromResult(displayPreferences);
+
+                // Once it succeeds, put it into the dictionary to make it available to everyone else
+                _displayPreferences.AddOrUpdate(displayPreferences.Id, newValue, delegate { return newValue; });
+            }
+            catch (Exception ex)
+            {
+                _logger.ErrorException("Error saving display preferences", ex);
+
+                throw;
+            }
+        }
+    }
+}