Create common interface for SyncPlay requests

MediaBrowser.Controller/SyncPlay/PlaybackRequests/AbstractPlaybackRequest.cs

@@ -0,0 +1,29 @@
+using System.Threading;
+using MediaBrowser.Controller.Session;
+using MediaBrowser.Model.SyncPlay;
+
+namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
+{
+    /// <summary>
+    /// Class AbstractPlaybackRequest.
+    /// </summary>
+    public abstract class AbstractPlaybackRequest : IGroupPlaybackRequest
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AbstractPlaybackRequest"/> class.
+        /// </summary>
+        protected AbstractPlaybackRequest()
+        {
+            // Do nothing.
+        }
+
+        /// <inheritdoc />
+        public RequestType Type { get; } = RequestType.Playback;
+
+        /// <inheritdoc />
+        public abstract PlaybackRequestType Action { get; }
+
+        /// <inheritdoc />
+        public abstract void Apply(IGroupStateContext context, IGroupState state, SessionInfo session, CancellationToken cancellationToken);
+    }
+}