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/Messaging/Commands/Command.cs

@@ -1,20 +1,9 @@
 using System;
-using FluentMigrator.Runner;
-using NzbDrone.Common.Messaging;
-using NzbDrone.Core.Datastore;
-using NzbDrone.Core.Messaging.Commands.Tracking;
 
 namespace NzbDrone.Core.Messaging.Commands
 {
-    public abstract class Command : ModelBase, IMessage
+    public abstract class Command
     {
-        private static readonly object Mutex = new object();
-        private static int _idCounter;
-        private readonly StopWatch _stopWatch;
-
-        public CommandStatus State { get; private set; }
-        public DateTime StateChangeTime { get; private set; }
-
         public virtual Boolean SendUpdatesToClient
         {
             get
@@ -23,63 +12,21 @@ namespace NzbDrone.Core.Messaging.Commands
             }
         }
 
-        public TimeSpan Runtime
+        public virtual string CompletionMessage
         {
             get
             {
-                return _stopWatch.ElapsedTime();
+                return "Completed";
             }
         }
 
-        public Boolean Manual { get; set; }
-        public Exception Exception { get; private set; }
-        public String Message { get; private set; }
-
         public String Name { get; private set; }
         public DateTime? LastExecutionTime { get; set; }
+        public CommandTrigger Trigger { get; set; }
 
-        protected Command()
+        public Command()
         {
             Name = GetType().Name.Replace("Command", "");
-            StateChangeTime = DateTime.UtcNow;
-            State = CommandStatus.Pending;
-            _stopWatch = new StopWatch();
-            Manual = false;
-
-            lock (Mutex)
-            {
-                Id = ++_idCounter;
-            }
-        }
-
-        public void Start()
-        {
-            _stopWatch.Start();
-            StateChangeTime = DateTime.UtcNow;
-            State = CommandStatus.Running;
-            SetMessage("Starting");
-        }
-
-        public void Failed(Exception exception, string message = "Failed")
-        {
-            _stopWatch.Stop();
-            StateChangeTime = DateTime.UtcNow;
-            State = CommandStatus.Failed;
-            Exception = exception;
-            SetMessage(message);
-        }
-
-        public void Completed(string message = "Completed")
-        {
-            _stopWatch.Stop();
-            StateChangeTime = DateTime.UtcNow;
-            State = CommandStatus.Completed;
-            SetMessage(message);
-        }
-
-        public void SetMessage(string message)
-        {
-            Message = message;
         }
     }
-}
+}