New provider system. Only for people right now

MediaBrowser.Providers/BaseXmlProvider.cs

@@ -0,0 +1,28 @@
+using MediaBrowser.Common.IO;
+using MediaBrowser.Controller.Providers;
+using System;
+using System.Threading;
+
+namespace MediaBrowser.Providers
+{
+    public abstract class BaseXmlProvider: IHasChangeMonitor
+    {
+        protected static readonly SemaphoreSlim XmlParsingResourcePool = new SemaphoreSlim(4, 4);
+
+        protected IFileSystem FileSystem;
+
+        protected BaseXmlProvider(IFileSystem fileSystem)
+        {
+            FileSystem = fileSystem;
+        }
+
+        protected abstract string GetXmlPath(string path);
+
+        public bool HasChanged(IHasMetadata item, DateTime date)
+        {
+            var path = GetXmlPath(item.Path);
+
+            return FileSystem.GetLastWriteTimeUtc(path) > date;
+        }
+    }
+}