Command queue

New: Adding multiple series will queue them instead of running all at once
New: Slower scheduled tasks won't be block others from running

src/NzbDrone.Core/Jobs/ScheduledTaskRepository.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Linq;
+using NzbDrone.Core.Datastore;
+using NzbDrone.Core.Messaging.Events;
+
+
+namespace NzbDrone.Core.Jobs
+{
+    public interface IScheduledTaskRepository : IBasicRepository<ScheduledTask>
+    {
+        ScheduledTask GetDefinition(Type type);
+        void SetLastExecutionTime(int id, DateTime executionTime);
+    }
+
+    public class ScheduledTaskRepository : BasicRepository<ScheduledTask>, IScheduledTaskRepository
+    {
+
+        public ScheduledTaskRepository(IDatabase database, IEventAggregator eventAggregator)
+            : base(database, eventAggregator)
+        {
+        }
+
+        public ScheduledTask GetDefinition(Type type)
+        {
+            return Query.Where(c => c.TypeName == type.FullName).Single();
+        }
+
+        public void SetLastExecutionTime(int id, DateTime executionTime)
+        {
+            var task = new ScheduledTask
+                {
+                    Id = id,
+                    LastExecution = executionTime
+                };
+
+            SetFields(task, scheduledTask => scheduledTask.LastExecution);
+        }
+    }
+}