1 files changed, 108 insertions, 0 deletions
diff --git a/MediaBrowser.Common/ScheduledTasks/TaskManager.cs b/MediaBrowser.Common/ScheduledTasks/TaskManager.cs
new file mode 100644
index 000000000..4e6407e7c
--- /dev/null
+++ b/MediaBrowser.Common/ScheduledTasks/TaskManager.cs
@@ -0,0 +1,108 @@
+using MediaBrowser.Common.Kernel;
+using MediaBrowser.Model.Tasks;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MediaBrowser.Common.ScheduledTasks
+{
+    /// <summary>
+    /// Class TaskManager
+    /// </summary>
+    public class TaskManager : BaseManager<IKernel>
+    {
+        /// <summary>
+        /// The _task queue
+        /// </summary>
+        private readonly List<Type> _taskQueue = new List<Type>();
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="TaskManager" /> class.
+        /// </summary>
+        /// <param name="kernel">The kernel.</param>
+        public TaskManager(IKernel kernel)
+            : base(kernel)
+        {
+
+        }
+
+        /// <summary>
+        /// Cancels if running and queue.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        public void CancelIfRunningAndQueue<T>()
+                 where T : IScheduledTask
+        {
+            Kernel.ScheduledTasks.OfType<T>().First().CancelIfRunning();
+            QueueScheduledTask<T>();
+        }
+
+        /// <summary>
+        /// Queues the scheduled task.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        public void QueueScheduledTask<T>()
+            where T : IScheduledTask
+        {
+            var scheduledTask = Kernel.ScheduledTasks.OfType<T>().First();
+
+            QueueScheduledTask(scheduledTask);
+        }
+
+        /// <summary>
+        /// Queues the scheduled task.
+        /// </summary>
+        /// <param name="task">The task.</param>
+        public void QueueScheduledTask(IScheduledTask task)
+        {
+            var type = task.GetType();
+
+            var scheduledTask = Kernel.ScheduledTasks.First(t => t.GetType() == type);
+
+            lock (_taskQueue)
+            {
+                // If it's idle just execute immediately
+                if (scheduledTask.State == TaskState.Idle)
+                {
+                    scheduledTask.Execute();
+                    return;
+                }
+
+                if (!_taskQueue.Contains(type))
+                {
+                    Logger.Info("Queueing task {0}", type.Name);
+                    _taskQueue.Add(type);
+                }
+                else
+                {
+                    Logger.Info("Task already queued: {0}", type.Name);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Called when [task completed].
+        /// </summary>
+        /// <param name="task">The task.</param>
+        internal void OnTaskCompleted(IScheduledTask task)
+        {
+            // Execute queued tasks
+            lock (_taskQueue)
+            {
+                var copy = _taskQueue.ToList();
+
+                foreach (var type in copy)
+                {
+                    var scheduledTask = Kernel.ScheduledTasks.First(t => t.GetType() == type);
+
+                    if (scheduledTask.State == TaskState.Idle)
+                    {
+                        scheduledTask.Execute();
+
+                        _taskQueue.Remove(type);
+                    }
+                }
+            }
+        }
+    }
+}