Merge pull request #5634 from OrchardCMS/feature/auto-enable-dependencies

Auto enable dependencies

Fixes #3132

src/Orchard.Tests/Environment/DefaultOrchardHostTests.cs

@@ -25,7 +25,6 @@ using Orchard.Tests.Stubs;
 using Orchard.Tests.Utility;
 using Orchard.WebApi.Routes;
 using IModelBinderProvider = Orchard.Mvc.ModelBinders.IModelBinderProvider;
-using Orchard.Tasks;
 
 namespace Orchard.Tests.Environment {
     [TestFixture]
@@ -139,8 +138,6 @@ namespace Orchard.Tests.Environment {
             }
         }
 
-
-
         [Test, Ignore("containers are disposed when calling BeginRequest, maybe by the StubVirtualPathMonitor")]
         public void NormalDependenciesShouldBeUniquePerRequestContainer() {
             var host = _lifetime.Resolve<IOrchardHost>();

src/Orchard.Tests/Environment/Extensions/ExtensionLoaderCoordinatorTests.cs

@@ -206,7 +206,7 @@ Features:
         Category: Content types
     AnotherWiki Editor:
         Description: A rich editor for wiki contents.
-        Dependencies: TinyMCE, AnotherWiki
+        Dependencies: TinyMce, AnotherWiki
         Category: Input methods
     AnotherWiki DistributionList:
         Description: Sends e-mail alerts when wiki contents gets published.
@@ -241,7 +241,7 @@ Features:
                         Assert.That(featureDescriptor.Description, Is.EqualTo("A rich editor for wiki contents."));
                         Assert.That(featureDescriptor.Category, Is.EqualTo("Input methods"));
                         Assert.That(featureDescriptor.Dependencies.Count(), Is.EqualTo(2));
-                        Assert.That(featureDescriptor.Dependencies.Contains("TinyMCE"));
+                        Assert.That(featureDescriptor.Dependencies.Contains("TinyMce"));
                         Assert.That(featureDescriptor.Dependencies.Contains("AnotherWiki"));
                         break;
                     case "AnotherWiki DistributionList":
@@ -287,7 +287,7 @@ Category: Content types
 Features:
     AnotherWiki Editor:
         Description: A rich editor for wiki contents.
-        Dependencies: TinyMCE, AnotherWiki
+        Dependencies: TinyMce, AnotherWiki
         Category: Input methods
     AnotherWiki DistributionList:
         Description: Sends e-mail alerts when wiki contents gets published.
@@ -323,7 +323,7 @@ Features:
                         Assert.That(featureDescriptor.Description, Is.EqualTo("A rich editor for wiki contents."));
                         Assert.That(featureDescriptor.Category, Is.EqualTo("Input methods"));
                         Assert.That(featureDescriptor.Dependencies.Count(), Is.EqualTo(2));
-                        Assert.That(featureDescriptor.Dependencies.Contains("TinyMCE"));
+                        Assert.That(featureDescriptor.Dependencies.Contains("TinyMce"));
                         Assert.That(featureDescriptor.Dependencies.Contains("AnotherWiki"));
                         break;
                     case "AnotherWiki DistributionList":

src/Orchard.Tests/Environment/Extensions/ExtensionManagerTests.cs

@@ -207,7 +207,7 @@ Features:
         Category: Content types
     AnotherWiki Editor:
         Description: A rich editor for wiki contents.
-        Dependencies: TinyMCE, AnotherWiki
+        Dependencies: TinyMce, AnotherWiki
         Category: Input methods
     AnotherWiki DistributionList:
         Description: Sends e-mail alerts when wiki contents gets published.
@@ -243,7 +243,7 @@ Features:
                         Assert.That(featureDescriptor.Description, Is.EqualTo("A rich editor for wiki contents."));
                         Assert.That(featureDescriptor.Category, Is.EqualTo("Input methods"));
                         Assert.That(featureDescriptor.Dependencies.Count(), Is.EqualTo(2));
-                        Assert.That(featureDescriptor.Dependencies.Contains("TinyMCE"));
+                        Assert.That(featureDescriptor.Dependencies.Contains("TinyMce"));
                         Assert.That(featureDescriptor.Dependencies.Contains("AnotherWiki"));
                         break;
                     case "AnotherWiki DistributionList":

src/Orchard.Tests/Environment/ShellBuilders/CompositionStrategyTests.cs

@@ -0,0 +1,118 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Autofac;
+using Moq;
+using NUnit.Framework;
+using Orchard.Environment.Configuration;
+using Orchard.Environment.Descriptor.Models;
+using Orchard.Environment.Extensions;
+using Orchard.Environment.Extensions.Models;
+using Orchard.Environment.ShellBuilders;
+using Orchard.Tests.Environment.TestDependencies;
+using Orchard.Utility.Extensions;
+
+namespace Orchard.Tests.Environment.ShellBuilders {
+    [TestFixture]
+    public class CompositionStrategyTests : ContainerTestBase {
+        private CompositionStrategy _compositionStrategy;
+        private Mock<IExtensionManager> _extensionManager;
+
+        protected override void Register(ContainerBuilder builder) {
+            _extensionManager = new Mock<IExtensionManager>(MockBehavior.Loose);
+
+            builder.RegisterType<CompositionStrategy>().AsSelf();
+            builder.RegisterInstance(_extensionManager.Object);
+        }
+
+        protected override void Resolve(ILifetimeScope container) {
+            _compositionStrategy = container.Resolve<CompositionStrategy>();
+
+            var alphaExtension = new ExtensionDescriptor {
+                Id = "Alpha",
+                Name = "Alpha",
+                ExtensionType = "Module"
+            };
+
+            var alphaFeatureDescriptor = new FeatureDescriptor {
+                Id = "Alpha",
+                Name = "Alpha",
+                Extension = alphaExtension
+            };
+
+            var betaFeatureDescriptor = new FeatureDescriptor {
+                Id = "Beta",
+                Name = "Beta",
+                Extension = alphaExtension,
+                Dependencies = new List<string> {
+                    "Alpha"
+                }
+            };
+
+            alphaExtension.Features = new List<FeatureDescriptor> {
+                alphaFeatureDescriptor,
+                betaFeatureDescriptor
+            };
+
+            var features = new List<Feature> {
+                new Feature {
+                    Descriptor = alphaFeatureDescriptor,
+                    ExportedTypes = new List<Type> {
+                        typeof(AlphaDependency)
+                    }
+                },
+                new Feature {
+                    Descriptor = betaFeatureDescriptor,
+                    ExportedTypes = new List<Type> {
+                        typeof(BetaDependency)
+                    }
+                }
+            };
+
+            _extensionManager.Setup(x => x.AvailableExtensions()).Returns(new List<ExtensionDescriptor> {
+                alphaExtension
+            });
+
+            _extensionManager.Setup(x => x.AvailableFeatures()).Returns(
+                _extensionManager.Object.AvailableExtensions()
+                .SelectMany(ext => ext.Features)
+                .ToReadOnlyCollection());
+
+            _extensionManager.Setup(x => x.LoadFeatures(It.IsAny<IEnumerable<FeatureDescriptor>>())).Returns(features);
+        }
+
+        [Test]
+        public void ComposeReturnsBlueprintWithExpectedDependencies() {
+            var shellSettings = CreateShell();
+            var shellDescriptor = CreateShellDescriptor("Alpha", "Beta");
+            var shellBlueprint = _compositionStrategy.Compose(shellSettings, shellDescriptor);
+
+            Assert.That(shellBlueprint.Dependencies.Count(x => x.Type == typeof (AlphaDependency)), Is.EqualTo(1));
+            Assert.That(shellBlueprint.Dependencies.Count(x => x.Type == typeof(BetaDependency)), Is.EqualTo(1));
+        }
+
+        [Test]
+        public void ComposeReturnsBlueprintWithAutoEnabledDependencyFeatures() {
+            var shellSettings = CreateShell();
+            var shellDescriptor = CreateShellDescriptor("Beta"); // Beta has a dependency on Alpha, but is not enabled initially.
+            var shellBlueprint = _compositionStrategy.Compose(shellSettings, shellDescriptor);
+
+            Assert.That(shellBlueprint.Dependencies.Count(x => x.Type == typeof(AlphaDependency)), Is.EqualTo(1));
+            Assert.That(shellDescriptor.Features.Count(x => x.Name == "Alpha"), Is.EqualTo(1));
+        }
+
+        private ShellSettings CreateShell() {
+            return new ShellSettings();
+        }
+
+        private ShellDescriptor CreateShellDescriptor(params string[] enabledFeatures) {
+            var shellDescriptor = new ShellDescriptor {
+                Features = enabledFeatures.Select(x => new ShellFeature {
+                    Name = x
+                })
+            };
+
+            return shellDescriptor;
+        }
+    }
+}

src/Orchard.Tests/Environment/TestDependencies/AlphaDependency.cs

@@ -0,0 +1,8 @@
+namespace Orchard.Tests.Environment.TestDependencies {
+
+    public interface IAlphaDependency : IDependency {
+    }
+
+    public class AlphaDependency : IAlphaDependency {
+    }
+}

src/Orchard.Tests/Environment/TestDependencies/BetaDependency.cs

@@ -0,0 +1,13 @@
+namespace Orchard.Tests.Environment.TestDependencies {
+
+    public interface IBetaDependency : IDependency {
+    }
+
+    public class BetaDependency : IBetaDependency {
+        public IAlphaDependency Alpha { get; set; }
+
+        public BetaDependency(IAlphaDependency alpha) {
+            Alpha = alpha;
+        }
+    }
+}

src/Orchard.Tests/Orchard.Framework.Tests.csproj

@@ -245,9 +245,12 @@
     <Compile Include="Environment\Extensions\ExtensionLoaderCoordinatorTests.cs" />
     <Compile Include="Environment\Features\FeatureManagerTests.cs" />
     <Compile Include="Environment\Loaders\DynamicExtensionLoaderTests.cs" />
+    <Compile Include="Environment\ShellBuilders\CompositionStrategyTests.cs" />
     <Compile Include="Environment\State\DefaultProcessingEngineTests.cs" />
     <Compile Include="Environment\RunningShellTableTests.cs" />
     <Compile Include="Environment\StubHostEnvironment.cs" />
+    <Compile Include="Environment\TestDependencies\AlphaDependency.cs" />
+    <Compile Include="Environment\TestDependencies\BetaDependency.cs" />
     <Compile Include="Environment\Utility\Build.cs" />
     <Compile Include="Environment\Warmup\WarmupUtilityTests.cs" />
     <Compile Include="FileSystems\AppData\AppDataFolderTests.cs" />

src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Scripts/Lib/jquery.fileupload-process.min.js

@@ -1 +0,0 @@
-!function(e){"use strict";"function"==typeof define&&define.amd?define(["jquery","./jquery.fileupload"],e):e(window.jQuery)}(function(e){"use strict";var s=e.blueimp.fileupload.prototype.options.add;e.widget("blueimp.fileupload",e.blueimp.fileupload,{options:{processQueue:[],add:function(r,i){var o=e(this);i.process(function(){return o.fileupload("process",i)}),s.call(this,r,i)}},processActions:{},_processFile:function(s,r){var i=this,o=e.Deferred().resolveWith(i,[s]),t=o.promise();return this._trigger("process",null,s),e.each(s.processQueue,function(s,o){var n=function(s){return r.errorThrown?e.Deferred().rejectWith(i,[r]).promise():i.processActions[o.action].call(i,s,o)};t=t.pipe(n,o.always&&n)}),t.done(function(){i._trigger("processdone",null,s),i._trigger("processalways",null,s)}).fail(function(){i._trigger("processfail",null,s),i._trigger("processalways",null,s)}),t},_transformProcessQueue:function(s){var r=[];e.each(s.processQueue,function(){var i={},o=this.action,t=this.prefix===!0?o:this.prefix;e.each(this,function(r,o){i[r]="string"===e.type(o)&&"@"===o.charAt(0)?s[o.slice(1)||(t?t+r.charAt(0).toUpperCase()+r.slice(1):r)]:o}),r.push(i)}),s.processQueue=r},processing:function(){return this._processing},process:function(s){var r=this,i=e.extend({},this.options,s);return i.processQueue&&i.processQueue.length&&(this._transformProcessQueue(i),0===this._processing&&this._trigger("processstart"),e.each(s.files,function(o){var t=o?e.extend({},i):i,n=function(){return s.errorThrown?e.Deferred().rejectWith(r,[s]).promise():r._processFile(t,s)};t.index=o,r._processing+=1,r._processingQueue=r._processingQueue.pipe(n,n).always(function(){r._processing-=1,0===r._processing&&r._trigger("processstop")})})),this._processingQueue},_create:function(){this._super(),this._processing=0,this._processingQueue=e.Deferred().resolveWith(this).promise()}})});

src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Scripts/Lib/jquery.fileupload-validate.min.js

@@ -1 +0,0 @@
-!function(e){"use strict";"function"==typeof define&&define.amd?define(["jquery","./jquery.fileupload-process"],e):e(window.jQuery)}(function(e){"use strict";e.blueimp.fileupload.prototype.options.processQueue.push({action:"validate",always:!0,acceptFileTypes:"@",maxFileSize:"@",minFileSize:"@",maxNumberOfFiles:"@",disabled:"@disableValidation"}),e.widget("blueimp.fileupload",e.blueimp.fileupload,{options:{getNumberOfFiles:e.noop,messages:{maxNumberOfFiles:"Maximum number of files exceeded",acceptFileTypes:"File type not allowed",maxFileSize:"File is too large",minFileSize:"File is too small"}},processActions:{validate:function(i,l){if(l.disabled)return i;var r,s=e.Deferred(),t=this.options,o=i.files[i.index];return(l.minFileSize||l.maxFileSize)&&(r=o.size),"number"===e.type(l.maxNumberOfFiles)&&(t.getNumberOfFiles()||0)+i.files.length>l.maxNumberOfFiles?o.error=t.i18n("maxNumberOfFiles"):!l.acceptFileTypes||l.acceptFileTypes.test(o.type)||l.acceptFileTypes.test(o.name)?r>l.maxFileSize?o.error=t.i18n("maxFileSize"):"number"===e.type(r)&&r<l.minFileSize?o.error=t.i18n("minFileSize"):delete o.error:o.error=t.i18n("acceptFileTypes"),o.error||i.files.error?(i.files.error=!0,s.rejectWith(this,[i])):s.resolveWith(this,[i]),s.promise()}}})});

src/Orchard/Commands/CommandBackgroundService.cs.rej

@@ -1,11 +0,0 @@
---- CommandBackgroundService.cs
-+++ CommandBackgroundService.cs
-@@ -1,7 +1,7 @@
- using Orchard.Tasks;
- 
- namespace Orchard.Commands {
--    public class CommandBackgroundService : IBackgroundService {
-+    class CommandBackgroundService : IBackgroundService {
-         public void Sweep() {
-             // Don't run any background service in command line
-         }

src/Orchard/Environment/DefaultOrchardHost.cs

@@ -15,7 +15,7 @@ using Orchard.Logging;
 using Orchard.Utility.Extensions;
 
 namespace Orchard.Environment {
-    // All the event handlers that DefaultOrchardHost implements have to be declared in OrchardStarter
+    // All the event handlers that DefaultOrchardHost implements have to be declared in OrchardStarter.
     public class DefaultOrchardHost : IOrchardHost, IShellSettingsManagerEventHandler, IShellDescriptorManagerEventHandler {
         private readonly IHostLocalRestart _hostLocalRestart;
         private readonly IShellSettingsManager _shellSettingsManager;

src/Orchard/Environment/DefaultOrchardShell.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Threading.Tasks;
 using Autofac.Features.OwnedInstances;
 using Microsoft.Owin.Builder;
 using Orchard.Environment.Configuration;
@@ -12,7 +11,6 @@ using Orchard.Owin;
 using Orchard.Tasks;
 using Orchard.UI;
 using Orchard.WebApi.Routes;
-using Owin;
 using IModelBinderProvider = Orchard.Mvc.ModelBinders.IModelBinderProvider;
 
 namespace Orchard.Environment {
@@ -37,6 +35,7 @@ namespace Orchard.Environment {
             ISweepGenerator sweepGenerator,
             IEnumerable<IOwinMiddlewareProvider> owinMiddlewareProviders,
             ShellSettings shellSettings) {
+
             _eventsFactory = eventsFactory;
             _routeProviders = routeProviders;
             _httpRouteProviders = httpRouteProviders;
@@ -53,7 +52,7 @@ namespace Orchard.Environment {
         public ILogger Logger { get; set; }
 
         public void Activate() {
-            IAppBuilder appBuilder = new AppBuilder();
+            var appBuilder = new AppBuilder();
             appBuilder.Properties["host.AppName"] = _shellSettings.Name;
 
             var orderedMiddlewares = _owinMiddlewareProviders
@@ -64,11 +63,10 @@ namespace Orchard.Environment {
                 middleware.Configure(appBuilder);
             }
 
-            // register the Orchard middleware after all others
+            // Register the Orchard middleware after all others.
             appBuilder.UseOrchard();
 
-            Func<IDictionary<string, object>, Task> pipeline = appBuilder.Build();
-
+            var pipeline = appBuilder.Build();
             var allRoutes = new List<RouteDescriptor>();
             allRoutes.AddRange(_routeProviders.SelectMany(provider => provider.GetRoutes()));
             allRoutes.AddRange(_httpRouteProviders.SelectMany(provider => provider.GetRoutes()));
@@ -79,16 +77,17 @@ namespace Orchard.Environment {
             using (var events = _eventsFactory()) {
                 events.Value.Activated();
             }
-
+            
             _sweepGenerator.Activate();
         }
 
         public void Terminate() {
             SafelyTerminate(() => {
-                       using (var events = _eventsFactory()) {
-                           SafelyTerminate(() => events.Value.Terminating());
-                       }
-                   });
+                using (var events = _eventsFactory()) {
+                    var localEvents = events;
+                    SafelyTerminate(() => localEvents.Value.Terminating());
+                }
+            });
 
             SafelyTerminate(() => _sweepGenerator.Terminate());
         }

src/Orchard/Environment/Descriptor/IShellDescriptorManager.cs

@@ -16,7 +16,7 @@ namespace Orchard.Environment.Descriptor {
 
         /// <summary>
         /// Alters databased information to match information passed as arguments.
-        /// Prior SerialNumber used for optomistic concurrency, and an exception
+        /// Prior SerialNumber used for optimistic concurrency, and an exception
         /// should be thrown if the number in storage doesn't match what's provided.
         /// </summary>
         void UpdateShellDescriptor(

src/Orchard/Environment/Extensions/Helpers/ExtensionManagerExtensions.cs

@@ -1,16 +0,0 @@
-using System.Collections.Generic;
-using System.Linq;
-using Orchard.Environment.Descriptor.Models;
-using Orchard.Environment.Extensions.Models;
-
-namespace Orchard.Environment.Extensions.Helpers {
-    public static class ExtensionManagerExtensions {
-        public static IEnumerable<FeatureDescriptor> EnabledFeatures(this IExtensionManager extensionManager, ShellDescriptor descriptor) {
-            return extensionManager.AvailableFeatures().Where(fd => descriptor.Features.Any(sf => sf.Name == fd.Id));
-        }
-
-        public static IEnumerable<FeatureDescriptor> DisabledFeatures(this IExtensionManager extensionManager, ShellDescriptor descriptor) {
-            return extensionManager.AvailableFeatures().Where(fd => descriptor.Features.All(sf => sf.Name != fd.Id));
-        }
-    }
-}

src/Orchard/Environment/Extensions/IExtensionManager.cs

@@ -1,4 +1,6 @@
 using System.Collections.Generic;
+using System.Linq;
+using Orchard.Environment.Descriptor.Models;
 using Orchard.Environment.Extensions.Models;
 
 namespace Orchard.Environment.Extensions {
@@ -10,4 +12,18 @@ namespace Orchard.Environment.Extensions {
 
         IEnumerable<Feature> LoadFeatures(IEnumerable<FeatureDescriptor> featureDescriptors);
     }
+
+    public static class ExtensionManagerExtensions {
+        public static IEnumerable<FeatureDescriptor> EnabledFeatures(this IExtensionManager extensionManager, ShellDescriptor descriptor) {
+            return EnabledFeatures(extensionManager, descriptor.Features);
+        }
+
+        public static IEnumerable<FeatureDescriptor> EnabledFeatures(this IExtensionManager extensionManager, IEnumerable<ShellFeature> features) {
+            return extensionManager.AvailableFeatures().Where(fd => features.Any(sf => sf.Name == fd.Id));
+        }
+
+        public static IEnumerable<FeatureDescriptor> DisabledFeatures(this IExtensionManager extensionManager, ShellDescriptor descriptor) {
+            return extensionManager.AvailableFeatures().Where(fd => descriptor.Features.All(sf => sf.Name != fd.Id));
+        }
+    }
 }

src/Orchard/Environment/ShellBuilders/CompositionStrategy.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Reflection;
 using System.Web.Http.Controllers;
 using System.Web.Mvc;
 using Autofac.Core;
@@ -16,17 +15,6 @@ using Orchard.Environment.ShellBuilders.Models;
 using Orchard.Logging;
 
 namespace Orchard.Environment.ShellBuilders {
-    /// <summary>
-    /// Service at the host level to transform the cachable descriptor into the loadable blueprint.
-    /// </summary>
-    public interface ICompositionStrategy {
-        /// <summary>
-        /// Using information from the IExtensionManager, transforms and populates all of the
-        /// blueprint model the shell builders will need to correctly initialize a tenant IoC container.
-        /// </summary>
-        ShellBlueprint Compose(ShellSettings settings, ShellDescriptor descriptor);
-    }
-
     public class CompositionStrategy : ICompositionStrategy {
         private readonly IExtensionManager _extensionManager;
 
@@ -41,14 +29,19 @@ namespace Orchard.Environment.ShellBuilders {
         public ShellBlueprint Compose(ShellSettings settings, ShellDescriptor descriptor) {
             Logger.Debug("Composing blueprint");
 
-            var enabledFeatures = _extensionManager.EnabledFeatures(descriptor);
-            var features = _extensionManager.LoadFeatures(enabledFeatures);
+            var builtinFeatures = BuiltinFeatures().ToList();
+            var builtinFeatureDescriptors = builtinFeatures.Select(x => x.Descriptor).ToList();
+            var availableFeatures = _extensionManager.AvailableFeatures().Concat(builtinFeatureDescriptors).ToDictionary(x => x.Id);
+            var enabledFeatures = _extensionManager.EnabledFeatures(descriptor).Select(x => x.Id).ToList();
+            var expandedFeatures = ExpandDependencies(availableFeatures, descriptor.Features.Select(x => x.Name)).ToList();
+            var autoEnabledDependencyFeatures = expandedFeatures.Except(enabledFeatures).Except(builtinFeatureDescriptors.Select(x => x.Id)).ToList();
+            var featureDescriptors = _extensionManager.EnabledFeatures(expandedFeatures.Select(x => new ShellFeature { Name = x})).ToList();
+            var features = _extensionManager.LoadFeatures(featureDescriptors);
 
             if (descriptor.Features.Any(feature => feature.Name == "Orchard.Framework"))
-                features = BuiltinFeatures().Concat(features);
+                features = builtinFeatures.Concat(features);
 
             var excludedTypes = GetExcludedTypes(features);
-
             var modules = BuildBlueprint(features, IsModule, BuildModule, excludedTypes);
             var dependencies = BuildBlueprint(features, IsDependency, (t, f) => BuildDependency(t, f, descriptor), excludedTypes);
             var controllers = BuildBlueprint(features, IsController, BuildController, excludedTypes);
@@ -64,16 +57,41 @@ namespace Orchard.Environment.ShellBuilders {
                 Records = records,
             };
 
-            Logger.Debug("Done composing blueprint");
+            Logger.Debug("Done composing blueprint.");
+
+            if (autoEnabledDependencyFeatures.Any()) {
+                // Add any dependencies previously not enabled to the shell descriptor.
+                descriptor.Features = descriptor.Features.Concat(autoEnabledDependencyFeatures.Select(x => new ShellFeature { Name = x })).ToList();
+                Logger.Information("Automatically enabled the following dependency features: {0}.", String.Join(", ", autoEnabledDependencyFeatures));
+            }
+
             return result;
         }
 
+        private IEnumerable<string> ExpandDependencies(IDictionary<string, FeatureDescriptor> availableFeatures, IEnumerable<string> features) {
+            return ExpandDependenciesInternal(availableFeatures, features).Distinct();
+        }
+
+        private IEnumerable<string> ExpandDependenciesInternal(IDictionary<string, FeatureDescriptor> availableFeatures, IEnumerable<string> features) {
+            foreach (var shellFeature in features) {
+                var feature = availableFeatures[shellFeature];
+                
+                foreach (var childDependency in ExpandDependenciesInternal(availableFeatures, feature.Dependencies))
+                    yield return childDependency;
+
+                foreach (var dependency in feature.Dependencies)
+                    yield return dependency;
+
+                yield return shellFeature;
+            }
+        }
+
         private static IEnumerable<string> GetExcludedTypes(IEnumerable<Feature> features) {
             var excludedTypes = new HashSet<string>();
 
-            // Identify replaced types
-            foreach (Feature feature in features) {
-                foreach (Type type in feature.ExportedTypes) {
+            // Identify replaced types.
+            foreach (var feature in features) {
+                foreach (var type in feature.ExportedTypes) {
                     foreach (OrchardSuppressDependencyAttribute replacedType in type.GetCustomAttributes(typeof(OrchardSuppressDependencyAttribute), false)) {
                         excludedTypes.Add(replacedType.FullName);
                     }
@@ -160,7 +178,7 @@ namespace Orchard.Environment.ShellBuilders {
         private static bool IsRecord(Type type) {
             return ((type.Namespace ?? "").EndsWith(".Models") || (type.Namespace ?? "").EndsWith(".Records")) &&
                    type.GetProperty("Id") != null &&
-                   (type.GetProperty("Id").GetAccessors() ?? Enumerable.Empty<MethodInfo>()).All(x => x.IsVirtual) &&
+                   (type.GetProperty("Id").GetAccessors()).All(x => x.IsVirtual) &&
                    !type.IsSealed &&
                    !type.IsAbstract &&
                    (!typeof(IContent).IsAssignableFrom(type) || typeof(ContentPartRecord).IsAssignableFrom(type));

src/Orchard/Environment/ShellBuilders/ICompositionStrategy.cs

@@ -0,0 +1,16 @@
+using Orchard.Environment.Configuration;
+using Orchard.Environment.Descriptor.Models;
+using Orchard.Environment.ShellBuilders.Models;
+
+namespace Orchard.Environment.ShellBuilders {
+    /// <summary>
+    /// Service at the host level to transform the cachable descriptor into the loadable blueprint.
+    /// </summary>
+    public interface ICompositionStrategy {
+        /// <summary>
+        /// Using information from the IExtensionManager, transforms and populates all of the
+        /// blueprint model the shell builders will need to correctly initialize a tenant IoC container.
+        /// </summary>
+        ShellBlueprint Compose(ShellSettings settings, ShellDescriptor descriptor);
+    }
+}

src/Orchard/Environment/ViewsBackgroundCompilation.cs

@@ -119,7 +119,7 @@ namespace Orchard.Environment {
         }
 
         private void CompileDirectory(CompilationContext context, string viewDirectory) {
-            // Prevent processing of the same directories multiple times (sligh performance optimization,
+            // Prevent processing of the same directories multiple times (slight performance optimization,
             // as the build manager second call to compile a view is essentially a "no-op".
             if (context.ProcessedDirectories.Contains(viewDirectory))
                 return;

src/Orchard/Orchard.Framework.csproj

@@ -151,8 +151,8 @@
   <ItemGroup>
     <Compile Include="Data\Migration\Schema\AddUniqueConstraintCommand.cs" />
     <Compile Include="Data\Migration\Schema\DropUniqueConstraintCommand.cs" />
-    <Compile Include="Environment\Extensions\Helpers\ExtensionManagerExtensions.cs" />
     <Compile Include="Environment\Extensions\Models\LifecycleStatus.cs" />
+    <Compile Include="Environment\ShellBuilders\ICompositionStrategy.cs" />
     <Compile Include="Mvc\Updater.cs" />
     <Compile Include="Recipes\Models\ConfigurationContext.cs" />
     <Compile Include="Recipes\Models\RecipeBuilderStepConfigurationContext.cs" />