rework scheduled tasks in preparation of common project going portable

MediaBrowser.Common.Implementations/ScheduledTasks/SystemEventTrigger.cs

@@ -0,0 +1,84 @@
+using MediaBrowser.Model.Events;
+using MediaBrowser.Model.Tasks;
+using Microsoft.Win32;
+using System;
+using System.Threading.Tasks;
+using MediaBrowser.Model.Logging;
+
+namespace MediaBrowser.Common.ScheduledTasks
+{
+    /// <summary>
+    /// Class SystemEventTrigger
+    /// </summary>
+    public class SystemEventTrigger : ITaskTrigger
+    {
+        /// <summary>
+        /// Gets or sets the system event.
+        /// </summary>
+        /// <value>The system event.</value>
+        public SystemEvent SystemEvent { get; set; }
+
+        /// <summary>
+        /// Gets the execution properties of this task.
+        /// </summary>
+        /// <value>
+        /// The execution properties of this task.
+        /// </value>
+        public TaskExecutionOptions TaskOptions { get; set; }
+
+        /// <summary>
+        /// Stars waiting for the trigger action
+        /// </summary>
+        /// <param name="lastResult">The last result.</param>
+        /// <param name="isApplicationStartup">if set to <c>true</c> [is application startup].</param>
+        public void Start(TaskResult lastResult, ILogger logger, string taskName, bool isApplicationStartup)
+        {
+            switch (SystemEvent)
+            {
+                case SystemEvent.WakeFromSleep:
+                    SystemEvents.PowerModeChanged += SystemEvents_PowerModeChanged;
+                    break;
+            }
+        }
+
+        /// <summary>
+        /// Stops waiting for the trigger action
+        /// </summary>
+        public void Stop()
+        {
+            SystemEvents.PowerModeChanged -= SystemEvents_PowerModeChanged;
+        }
+
+        /// <summary>
+        /// Handles the PowerModeChanged event of the SystemEvents control.
+        /// </summary>
+        /// <param name="sender">The source of the event.</param>
+        /// <param name="e">The <see cref="PowerModeChangedEventArgs" /> instance containing the event data.</param>
+        async void SystemEvents_PowerModeChanged(object sender, PowerModeChangedEventArgs e)
+        {
+            if (e.Mode == PowerModes.Resume && SystemEvent == SystemEvent.WakeFromSleep)
+            {
+                // This value is a bit arbitrary, but add a delay to help ensure network connections have been restored before running the task
+                await Task.Delay(10000).ConfigureAwait(false);
+
+                OnTriggered();
+            }
+        }
+
+        /// <summary>
+        /// Occurs when [triggered].
+        /// </summary>
+        public event EventHandler<GenericEventArgs<TaskExecutionOptions>> Triggered;
+
+        /// <summary>
+        /// Called when [triggered].
+        /// </summary>
+        private void OnTriggered()
+        {
+            if (Triggered != null)
+            {
+                Triggered(this, new GenericEventArgs<TaskExecutionOptions>(TaskOptions));
+            }
+        }
+    }
+}