Updated Container to handle Singleton Implementations instead of Singleton Interfaces.

src/NzbDrone.App.Test/ContainerFixture.cs

@@ -14,6 +14,7 @@ using FluentAssertions;
 using System.Linq;
 using NzbDrone.Common.Composition;
 using NzbDrone.Core.Datastore;
+using NzbDrone.Core.Download.TrackedDownloads;
 
 namespace NzbDrone.App.Test
 {
@@ -64,7 +65,6 @@ namespace NzbDrone.App.Test
         }
 
         [Test]
-        [Ignore("need to fix this at some point")]
         public void should_return_same_instance_of_singletons()
         {
             var first = _container.ResolveAll<IHandle<ApplicationShutdownRequested>>().OfType<Scheduler>().Single();
@@ -72,5 +72,23 @@ namespace NzbDrone.App.Test
 
             first.Should().BeSameAs(second);
         }
+
+        [Test]
+        public void should_return_same_instance_of_singletons_by_different_same_interface()
+        {
+            var first = _container.ResolveAll<IHandle<EpisodeGrabbedEvent>>().OfType<DownloadMonitoringService>().Single();
+            var second = _container.ResolveAll<IHandle<EpisodeGrabbedEvent>>().OfType<DownloadMonitoringService>().Single();
+
+            first.Should().BeSameAs(second);
+        }
+
+        [Test]
+        public void should_return_same_instance_of_singletons_by_different_interfaces()
+        {
+            var first = _container.ResolveAll<IHandle<EpisodeGrabbedEvent>>().OfType<DownloadMonitoringService>().Single();
+            var second = (DownloadMonitoringService)_container.Resolve<IExecute<CheckForFinishedDownloadCommand>>();
+
+            first.Should().BeSameAs(second);
+        }
     }
 }

src/NzbDrone.Common/Composition/Container.cs

@@ -51,7 +51,9 @@ namespace NzbDrone.Common.Composition
 
         public void RegisterSingleton(Type service, Type implementation)
         {
-            _container.Register(service, implementation).AsSingleton();
+            var factory = CreateSingletonImplementationFactory(implementation);
+
+            _container.Register(service, factory);
         }
 
         public IEnumerable<T> ResolveAll<T>() where T : class
@@ -59,9 +61,23 @@ namespace NzbDrone.Common.Composition
             return _container.ResolveAll<T>();
         }
 
-        public void RegisterAllAsSingleton(Type registrationType, IEnumerable<Type> implementationList)
+        public void RegisterAllAsSingleton(Type service, IEnumerable<Type> implementationList)
+        {
+            foreach (var implementation in implementationList)
             {
-            _container.RegisterMultiple(registrationType, implementationList).AsSingleton();
+                var factory = CreateSingletonImplementationFactory(implementation);
+
+                _container.Register(service, factory, implementation.FullName);
+            }
+        }
+
+        private Func<TinyIoCContainer, NamedParameterOverloads, object> CreateSingletonImplementationFactory(Type implementation)
+        {
+            const string singleImplPrefix = "singleImpl_";
+
+            _container.Register(implementation, implementation, singleImplPrefix + implementation.FullName).AsSingleton();
+
+            return (c, p) => _container.Resolve(implementation, singleImplPrefix + implementation.FullName);
         }
 
         public bool IsTypeRegistered(Type type)