update model project targeting

MediaBrowser.Server.Implementations/Threading/PeriodicTimer.cs

@@ -0,0 +1,72 @@
+using System;
+using System.Threading;
+using Microsoft.Win32;
+
+namespace MediaBrowser.Server.Implementations.Threading
+{
+    public class PeriodicTimer : IDisposable
+    {
+        public Action<object> Callback { get; set; }
+        private Timer _timer;
+        private readonly object _state;
+        private readonly object _timerLock = new object();
+        private readonly TimeSpan _period;
+
+        public PeriodicTimer(Action<object> callback, object state, TimeSpan dueTime, TimeSpan period)
+        {
+            if (callback == null)
+            {
+                throw new ArgumentNullException("callback");
+            }
+
+            Callback = callback;
+            _period = period;
+            _state = state;
+
+            StartTimer(dueTime);
+        }
+
+        void SystemEvents_PowerModeChanged(object sender, PowerModeChangedEventArgs e)
+        {
+            if (e.Mode == PowerModes.Resume)
+            {
+                DisposeTimer();
+                StartTimer(Timeout.InfiniteTimeSpan);
+            }
+        }
+
+        private void TimerCallback(object state)
+        {
+            Callback(state);
+        }
+
+        private void StartTimer(TimeSpan dueTime)
+        {
+            lock (_timerLock)
+            {
+                _timer = new Timer(TimerCallback, _state, dueTime, _period);
+
+                SystemEvents.PowerModeChanged += SystemEvents_PowerModeChanged;
+            }
+        }
+
+        private void DisposeTimer()
+        {
+            SystemEvents.PowerModeChanged -= SystemEvents_PowerModeChanged;
+            
+            lock (_timerLock)
+            {
+                if (_timer != null)
+                {
+                    _timer.Dispose();
+                    _timer = null;
+                }
+            }
+        }
+
+        public void Dispose()
+        {
+            DisposeTimer();
+        }
+    }
+}