update power management

Emby.Server.Implementations/EntryPoints/KeepServerAwake.cs

@@ -0,0 +1,65 @@
+using MediaBrowser.Controller;
+using MediaBrowser.Controller.Plugins;
+using MediaBrowser.Controller.Session;
+using MediaBrowser.Model.Logging;
+using System;
+using System.Linq;
+using MediaBrowser.Model.System;
+using MediaBrowser.Model.Threading;
+
+namespace Emby.Server.Implementations.EntryPoints
+{
+    public class KeepServerAwake : IServerEntryPoint
+    {
+        private readonly ISessionManager _sessionManager;
+        private readonly ILogger _logger;
+        private ITimer _timer;
+        private readonly IServerApplicationHost _appHost;
+        private readonly ITimerFactory _timerFactory;
+        private readonly IPowerManagement _powerManagement;
+
+        public KeepServerAwake(ISessionManager sessionManager, ILogger logger, IServerApplicationHost appHost, ITimerFactory timerFactory, IPowerManagement powerManagement)
+        {
+            _sessionManager = sessionManager;
+            _logger = logger;
+            _appHost = appHost;
+            _timerFactory = timerFactory;
+            _powerManagement = powerManagement;
+        }
+
+        public void Run()
+        {
+            _timer = _timerFactory.Create(OnTimerCallback, null, TimeSpan.FromMinutes(5), TimeSpan.FromMinutes(5));
+        }
+
+        private void OnTimerCallback(object state)
+        {
+            var now = DateTime.UtcNow;
+
+            try
+            {
+                if (_sessionManager.Sessions.Any(i => (now - i.LastActivityDate).TotalMinutes < 15))
+                {
+                    _powerManagement.PreventSystemStandby();
+                }
+                else
+                {
+                    _powerManagement.AllowSystemStandby();
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.ErrorException("Error resetting system standby timer", ex);
+            }
+        }
+
+        public void Dispose()
+        {
+            if (_timer != null)
+            {
+                _timer.Dispose();
+                _timer = null;
+            }
+        }
+    }
+}