rework scheduled tasks in preparation of common project going portable

MediaBrowser.Model/Tasks/IScheduledTask.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Model.Tasks
+{
+    /// <summary>
+    /// Interface IScheduledTaskWorker
+    /// </summary>
+    public interface IScheduledTask
+    {
+        /// <summary>
+        /// Gets the name of the task
+        /// </summary>
+        /// <value>The name.</value>
+        string Name { get; }
+
+        string Key { get; }
+
+        /// <summary>
+        /// Gets the description.
+        /// </summary>
+        /// <value>The description.</value>
+        string Description { get; }
+
+        /// <summary>
+        /// Gets the category.
+        /// </summary>
+        /// <value>The category.</value>
+        string Category { get; }
+
+        /// <summary>
+        /// Executes the task
+        /// </summary>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <param name="progress">The progress.</param>
+        /// <returns>Task.</returns>
+        Task Execute(CancellationToken cancellationToken, IProgress<double> progress);
+
+        /// <summary>
+        /// Gets the default triggers.
+        /// </summary>
+        /// <returns>IEnumerable{BaseTaskTrigger}.</returns>
+        IEnumerable<TaskTriggerInfo> GetDefaultTriggers();
+    }
+}