some initial work on cloud sync

MediaBrowser.Controller/Sync/IServerSyncProvider.cs

@@ -0,0 +1,52 @@
+using MediaBrowser.Model.Sync;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Controller.Sync
+{
+    public interface IServerSyncProvider : ISyncProvider
+    {
+        /// <summary>
+        /// Gets the server item ids.
+        /// </summary>
+        /// <param name="serverId">The server identifier.</param>
+        /// <param name="target">The target.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task&lt;List&lt;System.String&gt;&gt;.</returns>
+        Task<List<string>> GetServerItemIds(string serverId, SyncTarget target, CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Removes the item.
+        /// </summary>
+        /// <param name="serverId">The server identifier.</param>
+        /// <param name="itemId">The item identifier.</param>
+        /// <param name="target">The target.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        Task DeleteItem(string serverId, string itemId, SyncTarget target, CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Transfers the file.
+        /// </summary>
+        /// <param name="serverId">The server identifier.</param>
+        /// <param name="itemId">The item identifier.</param>
+        /// <param name="path">The path.</param>
+        /// <param name="target">The target.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        Task TransferItemFile(string serverId, string itemId, string path, SyncTarget target, CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Transfers the related file.
+        /// </summary>
+        /// <param name="serverId">The server identifier.</param>
+        /// <param name="itemId">The item identifier.</param>
+        /// <param name="path">The path.</param>
+        /// <param name="type">The type.</param>
+        /// <param name="target">The target.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        Task TransferRelatedFile(string serverId, string itemId, string path, ItemFileType type, SyncTarget target, CancellationToken cancellationToken);
+    }
+}