Merge pull request #7840 from umbraco/netcore/feature/booting-netcore-db

Netcore - Runtime booting and shutting down (and more)

.gitignore

@@ -166,3 +166,4 @@ build/temp/
 /src/ApiDocs/api/*
 /src/Umbraco.Web.UI.NetCore/wwwroot/Media/*
 /src/Umbraco.Web.UI.NetCore/wwwroot/is-cache/*
+/src/Umbraco.Tests.Integration/App_Data/*

src/Umbraco.Core/Composing/Composition.cs

@@ -33,13 +33,13 @@ namespace Umbraco.Core.Composing
         /// <param name="ioHelper">An IOHelper</param>
         public Composition(IRegister register,  TypeLoader typeLoader, IProfilingLogger logger, IRuntimeState runtimeState, Configs configs, IIOHelper ioHelper, AppCaches appCaches)
         {
-            _register = register;
-            TypeLoader = typeLoader;
-            Logger = logger;
-            RuntimeState = runtimeState;
-            Configs = configs;
-            IOHelper = ioHelper;
-            AppCaches = appCaches;
+            _register = register ?? throw new ArgumentNullException(nameof(register));
+            TypeLoader = typeLoader ?? throw new ArgumentNullException(nameof(typeLoader));
+            Logger = logger ?? throw new ArgumentNullException(nameof(logger));
+            RuntimeState = runtimeState ?? throw new ArgumentNullException(nameof(runtimeState));
+            Configs = configs ?? throw new ArgumentNullException(nameof(configs));
+            IOHelper = ioHelper ?? throw new ArgumentNullException(nameof(ioHelper));
+            AppCaches = appCaches ?? throw new ArgumentNullException(nameof(appCaches));
         }
 
         #region Services

src/Umbraco.Core/Composing/DefaultUmbracoAssemblyProvider.cs

@@ -18,6 +18,7 @@ namespace Umbraco.Core.Composing
             {
                 "Umbraco.Core",
                 "Umbraco.Web",
+                "Umbraco.Web.BackOffice",
                 "Umbraco.Infrastructure",
                 "Umbraco.PublishedCache.NuCache",
                 "Umbraco.ModelsBuilder.Embedded",

src/Umbraco.Core/Hosting/IApplicationShutdownRegistry.cs

@@ -0,0 +1,8 @@
+namespace Umbraco.Core.Hosting
+{
+    public interface IApplicationShutdownRegistry
+    {
+        void RegisterObject(IRegisteredObject registeredObject);
+        void UnregisterObject(IRegisteredObject registeredObject);
+    }
+}

src/Umbraco.Core/Hosting/IHostingEnvironment.cs

@@ -19,8 +19,5 @@ namespace Umbraco.Core.Hosting
         Version IISVersion { get; }
         string MapPath(string path);
         string ToAbsolute(string virtualPath, string root);
-
-        void RegisterObject(IRegisteredObject registeredObject);
-        void UnregisterObject(IRegisteredObject registeredObject);
     }
 }

src/Umbraco.Core/Net/IUmbracoApplicationLifetime.cs

@@ -1,5 +1,6 @@
 namespace Umbraco.Net
 {
+    // TODO: This shouldn't be in this namespace?
     public interface IUmbracoApplicationLifetime
     {
         /// <summary>

src/Umbraco.Core/Runtime/IMainDom.cs

@@ -1,4 +1,5 @@
 using System;
+using Umbraco.Core.Hosting;
 
 // TODO: Can't change namespace due to breaking changes, change in netcore
 namespace Umbraco.Core
@@ -16,10 +17,17 @@ namespace Umbraco.Core
         /// Gets a value indicating whether the current domain is the main domain.
         /// </summary>
         /// <remarks>
-        /// When the first call is made to this there will generally be some logic executed to acquire a distributed lock lease.
+        /// Acquire must be called first else this will always return false
         /// </remarks>
         bool IsMainDom { get; }
 
+        /// <summary>
+        /// Tries to acquire the MainDom, returns true if successful else false
+        /// </summary>
+        /// <param name="hostingEnvironment"></param>
+        /// <returns></returns>
+        bool Acquire(IApplicationShutdownRegistry hostingEnvironment);
+
         /// <summary>
         /// Registers a resource that requires the current AppDomain to be the main domain to function.
         /// </summary>

src/Umbraco.Core/Runtime/MainDom.cs

@@ -21,7 +21,7 @@ namespace Umbraco.Core.Runtime
         #region Vars
 
         private readonly ILogger _logger;
-        private readonly IHostingEnvironment _hostingEnvironment;
+        private IApplicationShutdownRegistry _hostingEnvironment;
         private readonly IMainDomLock _mainDomLock;
 
         // our own lock for local consistency
@@ -42,17 +42,25 @@ namespace Umbraco.Core.Runtime
         #region Ctor
 
         // initializes a new instance of MainDom
-        public MainDom(ILogger logger, IHostingEnvironment hostingEnvironment, IMainDomLock systemLock)
+        public MainDom(ILogger logger, IMainDomLock systemLock)
         {
-            hostingEnvironment.RegisterObject(this);
-
             _logger = logger;
-            _hostingEnvironment = hostingEnvironment;
             _mainDomLock = systemLock;
         }
 
         #endregion
 
+        public bool Acquire(IApplicationShutdownRegistry hostingEnvironment)
+        {
+            _hostingEnvironment = hostingEnvironment ?? throw new ArgumentNullException(nameof(hostingEnvironment));
+
+            return LazyInitializer.EnsureInitialized(ref _isMainDom, ref _isInitialized, ref _locko, () =>
+            {
+                hostingEnvironment.RegisterObject(this);
+                return Acquire();
+            });
+        }
+
         /// <summary>
         /// Registers a resource that requires the current AppDomain to be the main domain to function.
         /// </summary>
@@ -180,10 +188,9 @@ namespace Umbraco.Core.Runtime
         /// Gets a value indicating whether the current domain is the main domain.
         /// </summary>
         /// <remarks>
-        /// The lazy initializer call will only call the Acquire callback when it's not been initialized, else it will just return
-        /// the value from _isMainDom which means when we set _isMainDom to false again after being signaled, this will return false;
+        /// Acquire must be called first else this will always return false
         /// </remarks>
-        public bool IsMainDom => LazyInitializer.EnsureInitialized(ref _isMainDom, ref _isInitialized, ref _locko, () => Acquire());
+        public bool IsMainDom => _isMainDom;
 
         // IRegisteredObject
         void IRegisteredObject.Stop(bool immediate)
@@ -193,7 +200,7 @@ namespace Umbraco.Core.Runtime
             // The web app is stopping, need to wind down
             Dispose(true);
 
-            _hostingEnvironment.UnregisterObject(this);
+            _hostingEnvironment?.UnregisterObject(this);
         }
 
         #region IDisposable Support

src/Umbraco.Core/Scheduling/KeepAlive.cs

@@ -11,18 +11,22 @@ namespace Umbraco.Web.Scheduling
 {
     public class KeepAlive : RecurringTaskBase
     {
-        private readonly IRuntimeState _runtime;
+        private readonly IRuntimeState _runtimeState;
+        private readonly IMainDom _mainDom;
         private readonly IKeepAliveSettings _keepAliveSettings;
         private readonly IProfilingLogger _logger;
+        private readonly IServerRegistrar _serverRegistrar;
         private static HttpClient _httpClient;
 
         public KeepAlive(IBackgroundTaskRunner<RecurringTaskBase> runner, int delayMilliseconds, int periodMilliseconds,
-            IRuntimeState runtime, IKeepAliveSettings keepAliveSettings, IProfilingLogger logger)
+            IRuntimeState runtimeState, IMainDom mainDom, IKeepAliveSettings keepAliveSettings, IProfilingLogger logger, IServerRegistrar serverRegistrar)
             : base(runner, delayMilliseconds, periodMilliseconds)
         {
-            _runtime = runtime;
+            _runtimeState = runtimeState;
+            _mainDom = mainDom;
             _keepAliveSettings = keepAliveSettings;
             _logger = logger;
+            _serverRegistrar = serverRegistrar;
             if (_httpClient == null)
                 _httpClient = new HttpClient();
         }
@@ -30,7 +34,7 @@ namespace Umbraco.Web.Scheduling
         public override async Task<bool> PerformRunAsync(CancellationToken token)
         {
             // not on replicas nor unknown role servers
-            switch (_runtime.ServerRole)
+            switch (_serverRegistrar.GetCurrentServerRole())
             {
                 case ServerRole.Replica:
                     _logger.Debug<KeepAlive>("Does not run on replica servers.");
@@ -41,7 +45,7 @@ namespace Umbraco.Web.Scheduling
             }
 
             // ensure we do not run if not main domain, but do NOT lock it
-            if (_runtime.IsMainDom == false)
+            if (_mainDom.IsMainDom == false)
             {
                 _logger.Debug<KeepAlive>("Does not run if not MainDom.");
                 return false; // do NOT repeat, going down
@@ -54,7 +58,7 @@ namespace Umbraco.Web.Scheduling
                 {
                     if (keepAlivePingUrl.Contains("{umbracoApplicationUrl}"))
                     {
-                        var umbracoAppUrl = _runtime.ApplicationUrl.ToString();
+                        var umbracoAppUrl = _runtimeState.ApplicationUrl.ToString();
                         if (umbracoAppUrl.IsNullOrWhiteSpace())
                         {
                             _logger.Warn<KeepAlive>("No umbracoApplicationUrl for service (yet), skip.");

src/Umbraco.Core/Scheduling/TempFileCleanup.cs

@@ -14,26 +14,26 @@ namespace Umbraco.Web.Scheduling
     {
         private readonly DirectoryInfo[] _tempFolders;
         private readonly TimeSpan _age;
-        private readonly IRuntimeState _runtime;
+        private readonly IMainDom _mainDom;
         private readonly IProfilingLogger _logger;
 
         public TempFileCleanup(IBackgroundTaskRunner<RecurringTaskBase> runner, int delayMilliseconds, int periodMilliseconds,
             IEnumerable<DirectoryInfo> tempFolders, TimeSpan age,
-            IRuntimeState runtime, IProfilingLogger logger)
+            IMainDom mainDom, IProfilingLogger logger)
             : base(runner, delayMilliseconds, periodMilliseconds)
         {
             //SystemDirectories.TempFileUploads
 
             _tempFolders = tempFolders.ToArray();
             _age = age;
-            _runtime = runtime;
+            _mainDom = mainDom;
             _logger = logger;
         }
 
         public override bool PerformRun()
         {
             // ensure we do not run if not main domain
-            if (_runtime.IsMainDom == false)
+            if (_mainDom.IsMainDom == false)
             {
                 _logger.Debug<TempFileCleanup>("Does not run if not MainDom.");
                 return false; // do NOT repeat, going down

src/Umbraco.Core/Services/IRuntime.cs

@@ -13,13 +13,15 @@ namespace Umbraco.Core
         /// </summary>
         /// <param name="register">The application register.</param>
         /// <returns>The application factory.</returns>
-        IFactory Boot(IRegister register);
+        IFactory Configure(IRegister register);
 
         /// <summary>
         /// Gets the runtime state.
         /// </summary>
         IRuntimeState State { get; }
 
+        void Start();
+
         /// <summary>
         /// Terminates the runtime.
         /// </summary>

src/Umbraco.Core/Services/IRuntimeState.cs

@@ -25,33 +25,12 @@ namespace Umbraco.Core
         /// </summary>
         SemVersion SemanticVersion { get; }
 
-        /// <summary>
-        /// Gets a value indicating whether the application is running in debug mode.
-        /// </summary>
-        bool Debug { get; }
-
-        /// <summary>
-        /// Gets a value indicating whether the runtime is the current main domain.
-        /// </summary>
-        bool IsMainDom { get; }
-
-        /// <summary>
-        /// Get the server's current role.
-        /// </summary>
-        ServerRole ServerRole { get; }
-
         /// <summary>
         /// Gets the Umbraco application url.
         /// </summary>
         /// <remarks>This is eg "http://www.example.com".</remarks>
         Uri ApplicationUrl { get; }
 
-        /// <summary>
-        /// Gets the Umbraco application virtual path.
-        /// </summary>
-        /// <remarks>This is either "/" or eg "/virtual".</remarks>
-        string ApplicationVirtualPath { get; }
-
         /// <summary>
         /// Gets the runtime level of execution.
         /// </summary>
@@ -77,6 +56,5 @@ namespace Umbraco.Core
         /// </summary>
         BootFailedException BootFailedException { get; }
 
-        IMainDom MainDom { get; }
     }
 }

src/Umbraco.Core/SimpleMainDom.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Umbraco.Core.Hosting;
 
 namespace Umbraco.Core
 {
@@ -16,6 +17,9 @@ namespace Umbraco.Core
         /// <inheritdoc />
         public bool IsMainDom { get; private set; } = true;
 
+        // always acquire
+        public bool Acquire(IApplicationShutdownRegistry hostingEnvironment) => true;
+
         /// <inheritdoc />
         public bool Register(Action release, int weight = 100)
             => Register(null, release, weight);

src/Umbraco.Infrastructure/BatchedDatabaseServerMessenger.cs

@@ -28,17 +28,18 @@ namespace Umbraco.Web
         private readonly IRequestAccessor _requestAccessor;
 
         public BatchedDatabaseServerMessenger(
-            IRuntimeState runtime,
+            IMainDom mainDom,
             IUmbracoDatabaseFactory databaseFactory,
             IScopeProvider scopeProvider,
             ISqlContext sqlContext,
             IProfilingLogger proflog,
+            IServerRegistrar serverRegistrar,
             DatabaseServerMessengerOptions options,
             IHostingEnvironment hostingEnvironment,
             CacheRefresherCollection cacheRefreshers,
             IRequestCache requestCache,
             IRequestAccessor requestAccessor)
-            : base(runtime, scopeProvider, sqlContext, proflog, true, options, hostingEnvironment, cacheRefreshers)
+            : base(mainDom, scopeProvider, sqlContext, proflog, serverRegistrar, true, options, hostingEnvironment, cacheRefreshers)
         {
             _databaseFactory = databaseFactory;
             _requestCache = requestCache;

src/Umbraco.Infrastructure/Compose/DatabaseServerRegistrarAndMessengerComponent.cs

@@ -91,7 +91,6 @@ namespace Umbraco.Web.Compose
         private readonly BackgroundTaskRunner<IBackgroundTask> _processTaskRunner;
         private bool _started;
         private IBackgroundTask[] _tasks;
-        private IndexRebuilder _indexRebuilder;
         private readonly IRequestAccessor _requestAccessor;
 
         public DatabaseServerRegistrarAndMessengerComponent(
@@ -100,14 +99,12 @@ namespace Umbraco.Web.Compose
             IServerMessenger serverMessenger,
             IServerRegistrationService registrationService,
             ILogger logger,
-            IHostingEnvironment hostingEnvironment,
-            IndexRebuilder indexRebuilder,
+            IApplicationShutdownRegistry hostingEnvironment,
             IRequestAccessor requestAccessor)
         {
             _runtime = runtime;
             _logger = logger;
             _registrationService = registrationService;
-            _indexRebuilder = indexRebuilder;
             _requestAccessor = requestAccessor;
 
             // create task runner for DatabaseServerRegistrar

src/Umbraco.Infrastructure/Compose/ManifestWatcherComponent.cs

@@ -10,7 +10,7 @@ namespace Umbraco.Core.Compose
 {
     public sealed class ManifestWatcherComponent : IComponent
     {
-        private readonly IRuntimeState _runtimeState;
+        private readonly IHostingEnvironment _hosting;
         private readonly ILogger _logger;
         private readonly IIOHelper _ioHelper;
         private readonly IUmbracoApplicationLifetime _umbracoApplicationLifetime;
@@ -19,9 +19,9 @@ namespace Umbraco.Core.Compose
         // package.manifest chances and restarts the application on any change
         private ManifestWatcher _mw;
 
-        public ManifestWatcherComponent(IRuntimeState runtimeState, ILogger logger, IIOHelper ioHelper, IUmbracoApplicationLifetime umbracoApplicationLifetime)
+        public ManifestWatcherComponent(IHostingEnvironment hosting, ILogger logger, IIOHelper ioHelper, IUmbracoApplicationLifetime umbracoApplicationLifetime)
         {
-            _runtimeState = runtimeState;
+            _hosting = hosting;
             _logger = logger;
             _ioHelper = ioHelper;
             _umbracoApplicationLifetime = umbracoApplicationLifetime;
@@ -29,7 +29,7 @@ namespace Umbraco.Core.Compose
 
         public void Initialize()
         {
-            if (_runtimeState.Debug == false) return;
+            if (_hosting.IsDebugMode == false) return;
 
             //if (ApplicationContext.Current.IsConfigured == false || GlobalSettings.DebugMode == false)
             //    return;

src/Umbraco.Infrastructure/Composing/HostBuilderExtensions.cs

@@ -13,8 +13,9 @@ namespace Umbraco.Core.Composing
         /// <param name="builder"></param>
         /// <returns></returns>
         public static IHostBuilder UseUmbraco(this IHostBuilder builder)
-        {
-            return builder.UseServiceProviderFactory(new UmbracoServiceProviderFactory());
-        }
+            => builder.UseUmbraco(new UmbracoServiceProviderFactory());
+
+        public static IHostBuilder UseUmbraco(this IHostBuilder builder, UmbracoServiceProviderFactory umbracoServiceProviderFactory)
+            => builder.UseServiceProviderFactory(umbracoServiceProviderFactory);
     }
 }

src/Umbraco.Infrastructure/CompositionExtensions_Essentials.cs

@@ -1,6 +1,7 @@
 using Umbraco.Core.Cache;
 using Umbraco.Core.Composing;
 using Umbraco.Core.Configuration;
+using Umbraco.Core.Hosting;
 using Umbraco.Core.IO;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Persistence;
@@ -15,6 +16,9 @@ namespace Umbraco.Core
         /// <summary>
         /// Registers essential services.
         /// </summary>
+        /// <remarks>
+        /// These services are all either created by the runtime or used to construct the runtime
+        /// </remarks>
         public static void RegisterEssentials(this Composition composition,
             ILogger logger, IProfiler profiler, IProfilingLogger profilingLogger,
             IMainDom mainDom,
@@ -25,8 +29,10 @@ namespace Umbraco.Core
             ITypeFinder typeFinder,
             IIOHelper ioHelper,
             IUmbracoVersion umbracoVersion,
-            IDbProviderFactoryCreator dbProviderFactoryCreator)
-        {
+            IDbProviderFactoryCreator dbProviderFactoryCreator,
+            IHostingEnvironment hostingEnvironment,
+            IBackOfficeInfo backOfficeInfo)
+        {            
             composition.RegisterUnique(logger);
             composition.RegisterUnique(profiler);
             composition.RegisterUnique(profilingLogger);
@@ -42,6 +48,8 @@ namespace Umbraco.Core
             composition.RegisterUnique(umbracoVersion);
             composition.RegisterUnique(dbProviderFactoryCreator);
             composition.RegisterUnique(factory => factory.GetInstance<IUmbracoDatabaseFactory>().BulkSqlInsertProvider);
+            composition.RegisterUnique(hostingEnvironment);
+            composition.RegisterUnique(backOfficeInfo);
         }
     }
 }

src/Umbraco.Infrastructure/Intall/InstallHelper.cs

@@ -9,10 +9,10 @@ using Umbraco.Core.Cookie;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Migrations.Install;
 using Umbraco.Core.Models;
+using Umbraco.Net;
 using Umbraco.Core.Persistence;
 using Umbraco.Core.Serialization;
 using Umbraco.Core.Services;
-using Umbraco.Net;
 using Umbraco.Web.Install.Models;
 
 namespace Umbraco.Web.Install

src/Umbraco.Infrastructure/Intall/InstallSteps/StarterKitInstallStep.cs

@@ -2,8 +2,8 @@
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
-using Umbraco.Core.Services;
 using Umbraco.Net;
+using Umbraco.Core.Services;
 using Umbraco.Web.Install.Models;
 
 namespace Umbraco.Web.Install.InstallSteps

src/Umbraco.Infrastructure/Migrations/Install/DatabaseBuilder.cs

@@ -46,7 +46,7 @@ namespace Umbraco.Core.Migrations.Install
             IIOHelper ioHelper,
             IUmbracoVersion umbracoVersion,
             IDbProviderFactoryCreator dbProviderFactoryCreator,
-             IConfigManipulator configManipulator)
+            IConfigManipulator configManipulator)
         {
             _scopeProvider = scopeProvider;
             _globalSettings = globalSettings;

src/Umbraco.Infrastructure/Runtime/CoreInitialComposer.cs

@@ -44,7 +44,7 @@ namespace Umbraco.Core.Runtime
         public override void Compose(Composition composition)
         {
             base.Compose(composition);
-
+            
             // composers
             composition
                 .ComposeRepositories()
@@ -120,10 +120,11 @@ namespace Umbraco.Core.Runtime
             // project
             composition.RegisterUnique<IServerMessenger>(factory
                 => new DatabaseServerMessenger(
-                    factory.GetInstance<IRuntimeState>(),
+                    factory.GetInstance<IMainDom>(),
                     factory.GetInstance<IScopeProvider>(),
                     factory.GetInstance<ISqlContext>(),
                     factory.GetInstance<IProfilingLogger>(),
+                    factory.GetInstance<IServerRegistrar>(),
                     true, new DatabaseServerMessengerOptions(),
                     factory.GetInstance<IHostingEnvironment>(),
                     factory.GetInstance<CacheRefresherCollection>()
@@ -176,6 +177,8 @@ namespace Umbraco.Core.Runtime
             // Grid config is not a real config file as we know them
             composition.RegisterUnique<IGridConfig, GridConfig>();
 
+            // Config manipulator
+            composition.RegisterUnique<IConfigManipulator, JsonConfigManipulator>();
         }
     }
 }

src/Umbraco.Infrastructure/Runtime/CoreRuntime.cs

@@ -2,7 +2,6 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
-using System.Reflection;
 using Umbraco.Core.Cache;
 using Umbraco.Core.Composing;
 using Umbraco.Core.Configuration;
@@ -12,7 +11,6 @@ using Umbraco.Core.IO;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Persistence;
 using Umbraco.Core.Persistence.Mappers;
-using Umbraco.Core.Sync;
 
 namespace Umbraco.Core.Runtime
 {
@@ -25,12 +23,11 @@ namespace Umbraco.Core.Runtime
     {
         private ComponentCollection _components;
         private IFactory _factory;
-        private RuntimeState _state;
+        private readonly RuntimeState _state;
         private readonly IUmbracoBootPermissionChecker _umbracoBootPermissionChecker;
         private readonly IGlobalSettings _globalSettings;
         private readonly IConnectionStrings _connectionStrings;
 
-
         public CoreRuntime(
             Configs configs,
             IUmbracoVersion umbracoVersion,
@@ -65,11 +62,7 @@ namespace Umbraco.Core.Runtime
             // runtime state
             // beware! must use '() => _factory.GetInstance<T>()' and NOT '_factory.GetInstance<T>'
             // as the second one captures the current value (null) and therefore fails
-           _state = new RuntimeState(Logger,
-                Configs.Global(),
-                new Lazy<IMainDom>(() => mainDom),
-                new Lazy<IServerRegistrar>(() => _factory.GetInstance<IServerRegistrar>()),
-                UmbracoVersion,HostingEnvironment, BackOfficeInfo)
+           _state = new RuntimeState(Logger, Configs.Global(), UmbracoVersion, BackOfficeInfo)
             {
                 Level = RuntimeLevel.Boot
             };
@@ -81,13 +74,13 @@ namespace Umbraco.Core.Runtime
         protected ILogger Logger { get; }
 
         protected IBackOfficeInfo BackOfficeInfo { get; }
+
         public IDbProviderFactoryCreator DbProviderFactoryCreator { get; }
-        //public IBulkSqlInsertProvider BulkSqlInsertProvider { get; }
 
         /// <summary>
         /// Gets the profiler.
         /// </summary>
-        protected IProfiler Profiler { get; set; }
+        protected IProfiler Profiler { get; }
 
         /// <summary>
         /// Gets the profiling logger.
@@ -110,11 +103,13 @@ namespace Umbraco.Core.Runtime
         /// <inheritdoc />
         public IRuntimeState State => _state;
 
-        public IMainDom MainDom { get; private set; }
+        public IMainDom MainDom { get; }
 
         /// <inheritdoc/>
-        public virtual IFactory Boot(IRegister register)
+        public virtual IFactory Configure(IRegister register)
         {
+            if (register is null) throw new ArgumentNullException(nameof(register));
+
             // create and register the essential services
             // ie the bare minimum required to boot
 
@@ -139,25 +134,24 @@ namespace Umbraco.Core.Runtime
 
                 // application environment
                 ConfigureUnhandledException();
-                ConfigureApplicationRootPath();
-
-                Boot(register, timer);
+                return _factory = Configure(register, timer);
             }
-
-            return _factory;
         }
 
         /// <summary>
-        /// Boots the runtime within a timer.
+        /// Configure the runtime within a timer.
         /// </summary>
-        protected virtual IFactory Boot(IRegister register, DisposableTimer timer)
+        private IFactory Configure(IRegister register, DisposableTimer timer)
         {
+            if (register is null) throw new ArgumentNullException(nameof(register));
+            if (timer is null) throw new ArgumentNullException(nameof(timer));
+
             Composition composition = null;
+            IFactory factory = null;
 
             try
             {
-                // throws if not full-trust
-                _umbracoBootPermissionChecker.ThrowIfNotPermissions();
+                
 
                 // run handlers
                 RuntimeOptions.DoRuntimeBoot(ProfilingLogger);
@@ -171,31 +165,12 @@ namespace Umbraco.Core.Runtime
                 // type finder/loader
                 var typeLoader = new TypeLoader(IOHelper, TypeFinder, appCaches.RuntimeCache, new DirectoryInfo(HostingEnvironment.LocalTempPath), ProfilingLogger);
 
-                // runtime state
-                // beware! must use '() => _factory.GetInstance<T>()' and NOT '_factory.GetInstance<T>'
-                // as the second one captures the current value (null) and therefore fails
-                _state = new RuntimeState(Logger,
-                    Configs.Global(),
-                    new Lazy<IMainDom>(() => _factory.GetInstance<IMainDom>()),
-                    new Lazy<IServerRegistrar>(() => _factory.GetInstance<IServerRegistrar>()),
-                    UmbracoVersion, HostingEnvironment, BackOfficeInfo)
-                {
-                    Level = RuntimeLevel.Boot
-                };
-
                 // create the composition
                 composition = new Composition(register, typeLoader, ProfilingLogger, _state, Configs, IOHelper, appCaches);
-                composition.RegisterEssentials(Logger, Profiler, ProfilingLogger, MainDom, appCaches, databaseFactory, typeLoader, _state, TypeFinder, IOHelper, UmbracoVersion, DbProviderFactoryCreator);
+                composition.RegisterEssentials(Logger, Profiler, ProfilingLogger, MainDom, appCaches, databaseFactory, typeLoader, _state, TypeFinder, IOHelper, UmbracoVersion, DbProviderFactoryCreator, HostingEnvironment, BackOfficeInfo);
 
-                // run handlers
-                RuntimeOptions.DoRuntimeEssentials(composition, appCaches, typeLoader, databaseFactory);
-
-                // register runtime-level services
-                // there should be none, really - this is here "just in case"
-                Compose(composition);
-
-                // acquire the main domain - if this fails then anything that should be registered with MainDom will not operate
-                AcquireMainDom(MainDom);
+                // register ourselves (TODO: Should we put this in RegisterEssentials?)
+                composition.Register<IRuntime>(_ => this, Lifetime.Singleton);
 
                 // determine our runtime level
                 DetermineRuntimeLevel(databaseFactory, ProfilingLogger);
@@ -213,13 +188,7 @@ namespace Umbraco.Core.Runtime
                 composers.Compose();
 
                 // create the factory
-                _factory = composition.CreateFactory();
-
-                // create & initialize the components
-                _components = _factory.GetInstance<ComponentCollection>();
-                _components.Initialize();
-
-
+                factory = composition.CreateFactory();
             }
             catch (Exception e)
             {
@@ -236,11 +205,11 @@ namespace Umbraco.Core.Runtime
                 // if something goes wrong above, we may end up with no factory
                 // meaning nothing can get the runtime state, etc - so let's try
                 // to make sure we have a factory
-                if (_factory == null)
+                if (factory == null)
                 {
                     try
                     {
-                        _factory = composition?.CreateFactory();
+                        factory = composition?.CreateFactory();
                     }
                     catch { /* yea */ }
                 }
@@ -254,7 +223,29 @@ namespace Umbraco.Core.Runtime
                 // throw a BootFailedException for every requests.
             }
 
-            return _factory;
+            return factory;
+        }
+
+        public void Start()
+        {
+            // throws if not full-trust
+            _umbracoBootPermissionChecker.ThrowIfNotPermissions();
+
+            ConfigureApplicationRootPath();
+
+            // run handlers
+            RuntimeOptions.DoRuntimeEssentials(_factory);
+
+            var hostingEnvironmentLifetime = _factory.TryGetInstance<IApplicationShutdownRegistry>();
+            if (hostingEnvironmentLifetime == null)
+                throw new InvalidOperationException($"An instance of {typeof(IApplicationShutdownRegistry)} could not be resolved from the container, ensure that one if registered in your runtime before calling {nameof(IRuntime)}.{nameof(Start)}");
+
+            // acquire the main domain - if this fails then anything that should be registered with MainDom will not operate
+            AcquireMainDom(MainDom, _factory.GetInstance<IApplicationShutdownRegistry>());
+
+            // create & initialize the components
+            _components = _factory.GetInstance<ComponentCollection>();
+            _components.Initialize();
         }
 
         protected virtual void ConfigureUnhandledException()
@@ -281,13 +272,13 @@ namespace Umbraco.Core.Runtime
                 IOHelper.SetRootDirectory(path);
         }
 
-        private bool AcquireMainDom(IMainDom mainDom)
+        private bool AcquireMainDom(IMainDom mainDom, IApplicationShutdownRegistry applicationShutdownRegistry)
         {
             using (var timer = ProfilingLogger.DebugDuration<CoreRuntime>("Acquiring MainDom.", "Acquired."))
             {
                 try
                 {
-                    return mainDom.IsMainDom;
+                    return mainDom.Acquire(applicationShutdownRegistry);
                 }
                 catch
                 {
@@ -346,12 +337,6 @@ namespace Umbraco.Core.Runtime
             _components?.Terminate();
         }
 
-        /// <summary>
-        /// Composes the runtime.
-        /// </summary>
-        public virtual void Compose(Composition composition)
-        {
-        }
 
         #region Getters
 
@@ -392,5 +377,6 @@ namespace Umbraco.Core.Runtime
 
 
         #endregion
+
     }
 }

src/Umbraco.Infrastructure/Runtime/WebRuntime.cs

@@ -40,7 +40,7 @@ namespace Umbraco.Web.Runtime
         }
 
         /// <inheritdoc/>
-        public override IFactory Boot(IRegister register)
+        public override IFactory Configure(IRegister register)
         {
 
             var profilingLogger =  new ProfilingLogger(Logger, Profiler);
@@ -57,7 +57,7 @@ namespace Umbraco.Web.Runtime
                     NetworkHelper.MachineName);
                 Logger.Debug<CoreRuntime>("Runtime: {Runtime}", GetType().FullName);
 
-                var factory =  base.Boot(register);
+                var factory =  base.Configure(register);
 
                 // now (and only now) is the time to switch over to perWebRequest scopes.
                 // up until that point we may not have a request, and scoped services would

src/Umbraco.Infrastructure/RuntimeOptions.cs

@@ -16,7 +16,7 @@ namespace Umbraco.Core
     public static class RuntimeOptions
     {
         private static List<Action<IProfilingLogger>> _onBoot;
-        private static List<Action<Composition, AppCaches, TypeLoader, IUmbracoDatabaseFactory>> _onEssentials;
+        private static List<Action<IFactory>> _onEssentials;
 
         /// <summary>
         /// Executes the RuntimeBoot handlers.
@@ -33,13 +33,13 @@ namespace Umbraco.Core
         /// <summary>
         /// Executes the RuntimeEssentials handlers.
         /// </summary>
-        internal static void DoRuntimeEssentials(Composition composition, AppCaches appCaches, TypeLoader typeLoader, IUmbracoDatabaseFactory databaseFactory)
+        internal static void DoRuntimeEssentials(IFactory factory)
         {
             if (_onEssentials== null)
                 return;
 
             foreach (var action in _onEssentials)
-                action(composition, appCaches, typeLoader, databaseFactory);
+                action(factory);
         }
 
         /// <summary>
@@ -64,10 +64,10 @@ namespace Umbraco.Core
         /// essential things (AppCaches, a TypeLoader, and a database factory) but
         /// before anything else.</para>
         /// </remarks>
-        public static void OnRuntimeEssentials(Action<Composition, AppCaches, TypeLoader, IUmbracoDatabaseFactory> action)
+        public static void OnRuntimeEssentials(Action<IFactory> action)
         {
             if (_onEssentials == null)
-                _onEssentials = new List<Action<Composition, AppCaches, TypeLoader, IUmbracoDatabaseFactory>>();
+                _onEssentials = new List<Action<IFactory>>();
             _onEssentials.Add(action);
         }
     }

src/Umbraco.Infrastructure/RuntimeState.cs

@@ -22,46 +22,22 @@ namespace Umbraco.Core
         private readonly ILogger _logger;
         private readonly IGlobalSettings _globalSettings;
         private readonly ConcurrentHashSet<string> _applicationUrls = new ConcurrentHashSet<string>();
-        private readonly Lazy<IMainDom> _mainDom;
-        private readonly Lazy<IServerRegistrar> _serverRegistrar;
         private readonly IUmbracoVersion _umbracoVersion;
-        private readonly IHostingEnvironment _hostingEnvironment;
         private readonly IBackOfficeInfo _backOfficeInfo;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="RuntimeState"/> class.
         /// </summary>
         public RuntimeState(ILogger logger, IGlobalSettings globalSettings,
-            Lazy<IMainDom> mainDom, Lazy<IServerRegistrar> serverRegistrar, IUmbracoVersion umbracoVersion,
-            IHostingEnvironment hostingEnvironment,
+            IUmbracoVersion umbracoVersion,
             IBackOfficeInfo backOfficeInfo)
         {
             _logger = logger;
             _globalSettings = globalSettings;
-            _mainDom = mainDom;
-            _serverRegistrar = serverRegistrar;
             _umbracoVersion = umbracoVersion;
-            _hostingEnvironment = hostingEnvironment;
             _backOfficeInfo = backOfficeInfo;
-
-            ApplicationVirtualPath = _hostingEnvironment.ApplicationVirtualPath;
         }
 
-        /// <summary>
-        /// Gets the server registrar.
-        /// </summary>
-        /// <remarks>
-        /// <para>This is NOT exposed in the interface.</para>
-        /// </remarks>
-        private IServerRegistrar ServerRegistrar => _serverRegistrar.Value;
-
-        /// <summary>
-        /// Gets the application MainDom.
-        /// </summary>
-        /// <remarks>
-        /// <para>This is NOT exposed in the interface as MainDom is internal.</para>
-        /// </remarks>
-        public IMainDom MainDom => _mainDom.Value;
 
         /// <inheritdoc />
         public Version Version => _umbracoVersion.Current;
@@ -72,26 +48,14 @@ namespace Umbraco.Core
         /// <inheritdoc />
         public SemVersion SemanticVersion => _umbracoVersion.SemanticVersion;
 
-        /// <inheritdoc />
-        public bool Debug => _hostingEnvironment.IsDebugMode;
-
-        /// <inheritdoc />
-        public bool IsMainDom => MainDom.IsMainDom;
-
-        /// <inheritdoc />
-        public ServerRole ServerRole => ServerRegistrar.GetCurrentServerRole();
-
         /// <inheritdoc />
         public Uri ApplicationUrl { get; private set; }
 
         /// <inheritdoc />
-        public string ApplicationVirtualPath { get; }
+        public string CurrentMigrationState { get; private set; }
 
         /// <inheritdoc />
-        public string CurrentMigrationState { get; internal set; }
-
-        /// <inheritdoc />
-        public string FinalMigrationState { get; internal set; }
+        public string FinalMigrationState { get; private set; }
 
         /// <inheritdoc />
         public RuntimeLevel Level { get; internal set; } = RuntimeLevel.Unknown;
@@ -253,7 +217,7 @@ namespace Umbraco.Core
             Reason = RuntimeLevelReason.UpgradeMigrations;
         }
 
-        protected virtual bool EnsureUmbracoUpgradeState(IUmbracoDatabaseFactory databaseFactory, ILogger logger)
+        private bool EnsureUmbracoUpgradeState(IUmbracoDatabaseFactory databaseFactory, ILogger logger)
         {
             var upgrader = new Upgrader(new UmbracoPlan(_umbracoVersion, _globalSettings));
             var stateValueKey = upgrader.StateValueKey;

src/Umbraco.Infrastructure/Scheduling/BackgroundTaskRunner.cs

@@ -81,7 +81,7 @@ namespace Umbraco.Web.Scheduling
         private readonly string _logPrefix;
         private readonly BackgroundTaskRunnerOptions _options;
         private readonly ILogger _logger;
-        private readonly IHostingEnvironment _hostingEnvironment;
+        private readonly IApplicationShutdownRegistry _hostingEnvironment;
         private readonly object _locker = new object();
 
         private readonly BufferBlock<T> _tasks = new BufferBlock<T>(new DataflowBlockOptions());
@@ -105,7 +105,7 @@ namespace Umbraco.Web.Scheduling
         /// <param name="logger">A logger.</param>
         /// <param name="hostingEnvironment">The hosting environment</param>
         /// <param name="hook">An optional main domain hook.</param>
-        public BackgroundTaskRunner(ILogger logger, IHostingEnvironment hostingEnvironment, MainDomHook hook = null)
+        public BackgroundTaskRunner(ILogger logger, IApplicationShutdownRegistry hostingEnvironment, MainDomHook hook = null)
             : this(typeof(T).FullName, new BackgroundTaskRunnerOptions(), logger, hostingEnvironment, hook)
         { }
 
@@ -116,7 +116,7 @@ namespace Umbraco.Web.Scheduling
         /// <param name="logger">A logger.</param>
         /// <param name="hostingEnvironment">The hosting environment</param>
         /// <param name="hook">An optional main domain hook.</param>
-        public BackgroundTaskRunner(string name, ILogger logger, IHostingEnvironment hostingEnvironment, MainDomHook hook = null)
+        public BackgroundTaskRunner(string name, ILogger logger, IApplicationShutdownRegistry hostingEnvironment, MainDomHook hook = null)
             : this(name, new BackgroundTaskRunnerOptions(), logger, hostingEnvironment, hook)
         { }
 
@@ -127,7 +127,7 @@ namespace Umbraco.Web.Scheduling
         /// <param name="logger">A logger.</param>
         /// <param name="hostingEnvironment">The hosting environment</param>
         /// <param name="hook">An optional main domain hook.</param>
-        public BackgroundTaskRunner(BackgroundTaskRunnerOptions options, ILogger logger, IHostingEnvironment hostingEnvironment, MainDomHook hook = null)
+        public BackgroundTaskRunner(BackgroundTaskRunnerOptions options, ILogger logger, IApplicationShutdownRegistry hostingEnvironment, MainDomHook hook = null)
             : this(typeof(T).FullName, options, logger, hostingEnvironment, hook)
         { }
 
@@ -139,7 +139,7 @@ namespace Umbraco.Web.Scheduling
         /// <param name="logger">A logger.</param>
         /// <param name="hostingEnvironment">The hosting environment</param>
         /// <param name="hook">An optional main domain hook.</param>
-        public BackgroundTaskRunner(string name, BackgroundTaskRunnerOptions options, ILogger logger, IHostingEnvironment hostingEnvironment, MainDomHook hook = null)
+        public BackgroundTaskRunner(string name, BackgroundTaskRunnerOptions options, ILogger logger, IApplicationShutdownRegistry hostingEnvironment, MainDomHook hook = null)
         {
             _options = options ?? throw new ArgumentNullException(nameof(options));
             _logger = logger ?? throw new ArgumentNullException(nameof(logger));

src/Umbraco.Infrastructure/Scheduling/HealthCheckNotifier.cs

@@ -11,22 +11,27 @@ namespace Umbraco.Web.Scheduling
 {
     public class HealthCheckNotifier : RecurringTaskBase
     {
-        private readonly IRuntimeState _runtimeState;
+        private readonly IMainDom _mainDom;
         private readonly HealthCheckCollection _healthChecks;
         private readonly HealthCheckNotificationMethodCollection _notifications;
         private readonly IProfilingLogger _logger;
         private readonly IHealthChecksSettings _healthChecksSettingsConfig;
+        private readonly IServerRegistrar _serverRegistrar;
+        private readonly IRuntimeState _runtimeState;
 
         public HealthCheckNotifier(IBackgroundTaskRunner<RecurringTaskBase> runner, int delayMilliseconds, int periodMilliseconds,
             HealthCheckCollection healthChecks, HealthCheckNotificationMethodCollection notifications,
-            IRuntimeState runtimeState, IProfilingLogger logger, IHealthChecksSettings healthChecksSettingsConfig)
+            IMainDom mainDom, IProfilingLogger logger, IHealthChecksSettings healthChecksSettingsConfig, IServerRegistrar serverRegistrar,
+            IRuntimeState runtimeState)
             : base(runner, delayMilliseconds, periodMilliseconds)
         {
             _healthChecks = healthChecks;
             _notifications = notifications;
-            _runtimeState = runtimeState;
+            _mainDom = mainDom;
             _logger = logger;
             _healthChecksSettingsConfig = healthChecksSettingsConfig;
+            _serverRegistrar = serverRegistrar;
+            _runtimeState = runtimeState;
         }
 
         public override async Task<bool> PerformRunAsync(CancellationToken token)
@@ -34,7 +39,7 @@ namespace Umbraco.Web.Scheduling
             if (_runtimeState.Level != RuntimeLevel.Run)
                 return true; // repeat...
 
-            switch (_runtimeState.ServerRole)
+            switch (_serverRegistrar.GetCurrentServerRole())
             {
                 case ServerRole.Replica:
                     _logger.Debug<HealthCheckNotifier>("Does not run on replica servers.");
@@ -45,7 +50,7 @@ namespace Umbraco.Web.Scheduling
             }
 
             // ensure we do not run if not main domain, but do NOT lock it
-            if (_runtimeState.IsMainDom == false)
+            if (_mainDom.IsMainDom == false)
             {
                 _logger.Debug<HealthCheckNotifier>("Does not run if not MainDom.");
                 return false; // do NOT repeat, going down

src/Umbraco.Infrastructure/Scheduling/LogScrubber.cs

@@ -11,17 +11,19 @@ namespace Umbraco.Web.Scheduling
 
     public class LogScrubber : RecurringTaskBase
     {
-        private readonly IRuntimeState _runtime;
+        private readonly IMainDom _mainDom;
+        private readonly IServerRegistrar _serverRegistrar;
         private readonly IAuditService _auditService;
         private readonly ILoggingSettings _settings;
         private readonly IProfilingLogger _logger;
         private readonly IScopeProvider _scopeProvider;
 
         public LogScrubber(IBackgroundTaskRunner<RecurringTaskBase> runner, int delayMilliseconds, int periodMilliseconds,
-            IRuntimeState runtime, IAuditService auditService, ILoggingSettings settings, IScopeProvider scopeProvider, IProfilingLogger logger)
+            IMainDom mainDom, IServerRegistrar serverRegistrar, IAuditService auditService, ILoggingSettings settings, IScopeProvider scopeProvider, IProfilingLogger logger)
             : base(runner, delayMilliseconds, periodMilliseconds)
         {
-            _runtime = runtime;
+            _mainDom = mainDom;
+            _serverRegistrar = serverRegistrar;
             _auditService = auditService;
             _settings = settings;
             _scopeProvider = scopeProvider;
@@ -53,7 +55,7 @@ namespace Umbraco.Web.Scheduling
 
         public override bool PerformRun()
         {
-            switch (_runtime.ServerRole)
+            switch (_serverRegistrar.GetCurrentServerRole())
             {
                 case ServerRole.Replica:
                     _logger.Debug<LogScrubber>("Does not run on replica servers.");
@@ -64,7 +66,7 @@ namespace Umbraco.Web.Scheduling
             }
 
             // ensure we do not run if not main domain, but do NOT lock it
-            if (_runtime.IsMainDom == false)
+            if (_mainDom.IsMainDom == false)
             {
                 _logger.Debug<LogScrubber>("Does not run if not MainDom.");
                 return false; // do NOT repeat, going down

src/Umbraco.Infrastructure/Scheduling/ScheduledPublishing.cs

@@ -10,16 +10,20 @@ namespace Umbraco.Web.Scheduling
     public class ScheduledPublishing : RecurringTaskBase
     {
         private readonly IRuntimeState _runtime;
+        private readonly IMainDom _mainDom;
+        private readonly IServerRegistrar _serverRegistrar;
         private readonly IContentService _contentService;
         private readonly IUmbracoContextFactory _umbracoContextFactory;
         private readonly ILogger _logger;
         private readonly IServerMessenger _serverMessenger;
 
         public ScheduledPublishing(IBackgroundTaskRunner<RecurringTaskBase> runner, int delayMilliseconds, int periodMilliseconds,
-            IRuntimeState runtime, IContentService contentService, IUmbracoContextFactory umbracoContextFactory, ILogger logger, IServerMessenger serverMessenger)
+            IRuntimeState runtime, IMainDom mainDom, IServerRegistrar serverRegistrar, IContentService contentService, IUmbracoContextFactory umbracoContextFactory, ILogger logger, IServerMessenger serverMessenger)
             : base(runner, delayMilliseconds, periodMilliseconds)
         {
             _runtime = runtime;
+            _mainDom = mainDom;
+            _serverRegistrar = serverRegistrar;
             _contentService = contentService;
             _umbracoContextFactory = umbracoContextFactory;
             _logger = logger;
@@ -31,7 +35,7 @@ namespace Umbraco.Web.Scheduling
             if (Suspendable.ScheduledPublishing.CanRun == false)
                 return true; // repeat, later
 
-            switch (_runtime.ServerRole)
+            switch (_serverRegistrar.GetCurrentServerRole())
             {
                 case ServerRole.Replica:
                     _logger.Debug<ScheduledPublishing>("Does not run on replica servers.");
@@ -42,7 +46,7 @@ namespace Umbraco.Web.Scheduling
             }
 
             // ensure we do not run if not main domain, but do NOT lock it
-            if (_runtime.IsMainDom == false)
+            if (_mainDom.IsMainDom == false)
             {
                 _logger.Debug<ScheduledPublishing>("Does not run if not MainDom.");
                 return false; // do NOT repeat, going down

src/Umbraco.Infrastructure/Scheduling/SchedulerComponent.cs

@@ -26,10 +26,12 @@ namespace Umbraco.Web.Scheduling
         private const int OneHourMilliseconds = 3600000;
 
         private readonly IRuntimeState _runtime;
+        private readonly IMainDom _mainDom;
+        private readonly IServerRegistrar _serverRegistrar;
         private readonly IContentService _contentService;
         private readonly IAuditService _auditService;
         private readonly IProfilingLogger _logger;
-        private readonly IHostingEnvironment _hostingEnvironment;
+        private readonly IApplicationShutdownRegistry _hostingEnvironment;
         private readonly IScopeProvider _scopeProvider;
         private readonly HealthCheckCollection _healthChecks;
         private readonly HealthCheckNotificationMethodCollection _notifications;
@@ -43,7 +45,6 @@ namespace Umbraco.Web.Scheduling
 
         private BackgroundTaskRunner<IBackgroundTask> _keepAliveRunner;
         private BackgroundTaskRunner<IBackgroundTask> _publishingRunner;
-        private BackgroundTaskRunner<IBackgroundTask> _tasksRunner;
         private BackgroundTaskRunner<IBackgroundTask> _scrubberRunner;
         private BackgroundTaskRunner<IBackgroundTask> _fileCleanupRunner;
         private BackgroundTaskRunner<IBackgroundTask> _healthCheckRunner;
@@ -52,15 +53,17 @@ namespace Umbraco.Web.Scheduling
         private object _locker = new object();
         private IBackgroundTask[] _tasks;
 
-        public SchedulerComponent(IRuntimeState runtime,
+        public SchedulerComponent(IRuntimeState runtime, IMainDom mainDom, IServerRegistrar serverRegistrar,
             IContentService contentService, IAuditService auditService,
             HealthCheckCollection healthChecks, HealthCheckNotificationMethodCollection notifications,
             IScopeProvider scopeProvider, IUmbracoContextFactory umbracoContextFactory, IProfilingLogger logger,
-            IHostingEnvironment hostingEnvironment, IHealthChecksSettings healthChecksSettingsConfig,
+            IApplicationShutdownRegistry hostingEnvironment, IHealthChecksSettings healthChecksSettingsConfig,
             IIOHelper ioHelper, IServerMessenger serverMessenger, IRequestAccessor requestAccessor,
             ILoggingSettings loggingSettings, IKeepAliveSettings keepAliveSettings)
         {
             _runtime = runtime;
+            _mainDom = mainDom;
+            _serverRegistrar = serverRegistrar;
             _contentService = contentService;
             _auditService = auditService;
             _scopeProvider = scopeProvider;
@@ -83,7 +86,6 @@ namespace Umbraco.Web.Scheduling
             // backgrounds runners are web aware, if the app domain dies, these tasks will wind down correctly
             _keepAliveRunner = new BackgroundTaskRunner<IBackgroundTask>("KeepAlive", _logger, _hostingEnvironment);
             _publishingRunner = new BackgroundTaskRunner<IBackgroundTask>("ScheduledPublishing", _logger, _hostingEnvironment);
-            _tasksRunner = new BackgroundTaskRunner<IBackgroundTask>("ScheduledTasks", _logger, _hostingEnvironment);
             _scrubberRunner = new BackgroundTaskRunner<IBackgroundTask>("LogScrubber", _logger, _hostingEnvironment);
             _fileCleanupRunner = new BackgroundTaskRunner<IBackgroundTask>("TempFileCleanup", _logger, _hostingEnvironment);
             _healthCheckRunner = new BackgroundTaskRunner<IBackgroundTask>("HealthCheckNotifier", _logger, _hostingEnvironment);
@@ -138,7 +140,7 @@ namespace Umbraco.Web.Scheduling
         {
             // ping/keepalive
             // on all servers
-            var task = new KeepAlive(_keepAliveRunner, DefaultDelayMilliseconds, FiveMinuteMilliseconds, _runtime, keepAliveSettings, _logger);
+            var task = new KeepAlive(_keepAliveRunner, DefaultDelayMilliseconds, FiveMinuteMilliseconds, _runtime, _mainDom, keepAliveSettings, _logger, _serverRegistrar);
             _keepAliveRunner.TryAdd(task);
             return task;
         }
@@ -147,7 +149,7 @@ namespace Umbraco.Web.Scheduling
         {
             // scheduled publishing/unpublishing
             // install on all, will only run on non-replica servers
-            var task = new ScheduledPublishing(_publishingRunner, DefaultDelayMilliseconds, OneMinuteMilliseconds, _runtime, _contentService, _umbracoContextFactory, _logger, _serverMessenger);
+            var task = new ScheduledPublishing(_publishingRunner, DefaultDelayMilliseconds, OneMinuteMilliseconds, _runtime, _mainDom, _serverRegistrar, _contentService, _umbracoContextFactory, _logger, _serverMessenger);
             _publishingRunner.TryAdd(task);
             return task;
         }
@@ -173,7 +175,7 @@ namespace Umbraco.Web.Scheduling
             }
 
             var periodInMilliseconds = healthCheckSettingsConfig.NotificationSettings.PeriodInHours * 60 * 60 * 1000;
-            var task = new HealthCheckNotifier(_healthCheckRunner, delayInMilliseconds, periodInMilliseconds, healthChecks, notifications, _runtime, logger, _healthChecksSettingsConfig);
+            var task = new HealthCheckNotifier(_healthCheckRunner, delayInMilliseconds, periodInMilliseconds, healthChecks, notifications, _mainDom, logger, _healthChecksSettingsConfig, _serverRegistrar, _runtime);
             _healthCheckRunner.TryAdd(task);
             return task;
         }
@@ -182,7 +184,7 @@ namespace Umbraco.Web.Scheduling
         {
             // log scrubbing
             // install on all, will only run on non-replica servers
-            var task = new LogScrubber(_scrubberRunner, DefaultDelayMilliseconds, LogScrubber.GetLogScrubbingInterval(), _runtime, _auditService, settings, _scopeProvider, _logger);
+            var task = new LogScrubber(_scrubberRunner, DefaultDelayMilliseconds, LogScrubber.GetLogScrubbingInterval(), _mainDom, _serverRegistrar, _auditService, settings, _scopeProvider, _logger);
             _scrubberRunner.TryAdd(task);
             return task;
         }
@@ -194,7 +196,7 @@ namespace Umbraco.Web.Scheduling
             var task = new TempFileCleanup(_fileCleanupRunner, DefaultDelayMilliseconds, OneHourMilliseconds,
                 new[] { new DirectoryInfo(_ioHelper.MapPath(Constants.SystemDirectories.TempFileUploads)) },
                 TimeSpan.FromDays(1), //files that are over a day old
-                _runtime, _logger);
+                _mainDom, _logger);
             _scrubberRunner.TryAdd(task);
             return task;
         }

src/Umbraco.Infrastructure/Search/BackgroundIndexRebuilder.cs

@@ -18,10 +18,10 @@ namespace Umbraco.Web.Search
         private readonly IndexRebuilder _indexRebuilder;
         private readonly IMainDom _mainDom;
         private readonly IProfilingLogger _logger;
-        private readonly IHostingEnvironment _hostingEnvironment;
+        private readonly IApplicationShutdownRegistry _hostingEnvironment;
         private static BackgroundTaskRunner<IBackgroundTask> _rebuildOnStartupRunner;
 
-        public BackgroundIndexRebuilder(IMainDom mainDom, IProfilingLogger logger, IHostingEnvironment hostingEnvironment, IndexRebuilder indexRebuilder)
+        public BackgroundIndexRebuilder(IMainDom mainDom, IProfilingLogger logger, IApplicationShutdownRegistry hostingEnvironment, IndexRebuilder indexRebuilder)
         {
             _mainDom = mainDom;
             _logger = logger;
@@ -32,8 +32,6 @@ namespace Umbraco.Web.Search
         /// <summary>
         /// Called to rebuild empty indexes on startup
         /// </summary>
-        /// <param name="indexRebuilder"></param>
-        /// <param name="logger"></param>
         /// <param name="onlyEmptyIndexes"></param>
         /// <param name="waitMilliseconds"></param>
         public void RebuildIndexes(bool onlyEmptyIndexes, int waitMilliseconds = 0)

src/Umbraco.Infrastructure/Sync/DatabaseServerMessenger.cs

@@ -28,10 +28,11 @@ namespace Umbraco.Core.Sync
     //
     public class DatabaseServerMessenger : ServerMessengerBase, IDatabaseServerMessenger
     {
-        private readonly IRuntimeState _runtime;
+        private readonly IMainDom _mainDom;
         private readonly ManualResetEvent _syncIdle;
         private readonly object _locko = new object();
         private readonly IProfilingLogger _profilingLogger;
+        private readonly IServerRegistrar _serverRegistrar;
         private readonly IHostingEnvironment _hostingEnvironment;
         private readonly CacheRefresherCollection _cacheRefreshers;
         private readonly ISqlContext _sqlContext;
@@ -46,14 +47,15 @@ namespace Umbraco.Core.Sync
         public DatabaseServerMessengerOptions Options { get; }
 
         public DatabaseServerMessenger(
-            IRuntimeState runtime, IScopeProvider scopeProvider, ISqlContext sqlContext, IProfilingLogger proflog,
+            IMainDom mainDom, IScopeProvider scopeProvider, ISqlContext sqlContext, IProfilingLogger proflog, IServerRegistrar serverRegistrar,
             bool distributedEnabled, DatabaseServerMessengerOptions options,  IHostingEnvironment hostingEnvironment, CacheRefresherCollection cacheRefreshers)
             : base(distributedEnabled)
         {
             ScopeProvider = scopeProvider ?? throw new ArgumentNullException(nameof(scopeProvider));
             _sqlContext = sqlContext;
-            _runtime = runtime;
+            _mainDom = mainDom;
             _profilingLogger = proflog ?? throw new ArgumentNullException(nameof(proflog));
+            _serverRegistrar = serverRegistrar;
             _hostingEnvironment = hostingEnvironment;
             _cacheRefreshers = cacheRefreshers;
             Logger = proflog;
@@ -126,7 +128,7 @@ namespace Umbraco.Core.Sync
             const int weight = 10;
 
 
-            var registered = _runtime.MainDom.Register(
+            var registered = _mainDom.Register(
                 () =>
                 {
                     lock (_locko)
@@ -262,7 +264,7 @@ namespace Umbraco.Core.Sync
 
                     _lastPruned = _lastSync;
 
-                    switch (_runtime.ServerRole)
+                    switch (_serverRegistrar.GetCurrentServerRole())
                     {
                         case ServerRole.Single:
                         case ServerRole.Master:

src/Umbraco.ModelsBuilder.Embedded/PureLiveModelFactory.cs

@@ -42,7 +42,7 @@ namespace Umbraco.ModelsBuilder.Embedded
         private static readonly string[] OurFiles = { "models.hash", "models.generated.cs", "all.generated.cs", "all.dll.path", "models.err" };
 
         private readonly IModelsBuilderConfig _config;
-        private readonly IHostingEnvironment _hostingEnvironment;
+        private readonly IApplicationShutdownRegistry _hostingLifetime;
         private readonly IIOHelper _ioHelper;
         private readonly ModelsGenerationError _errors;
 
@@ -51,12 +51,13 @@ namespace Umbraco.ModelsBuilder.Embedded
             IProfilingLogger logger,
             IModelsBuilderConfig config,
             IHostingEnvironment hostingEnvironment,
+            IApplicationShutdownRegistry hostingLifetime,
             IIOHelper ioHelper)
         {
             _umbracoServices = umbracoServices;
             _logger = logger;
             _config = config;
-            _hostingEnvironment = hostingEnvironment;
+            _hostingLifetime = hostingLifetime;
             _ioHelper = ioHelper;
             _errors = new ModelsGenerationError(config, ioHelper);
             _ver = 1; // zero is for when we had no version
@@ -64,7 +65,7 @@ namespace Umbraco.ModelsBuilder.Embedded
 
             RazorBuildProvider.CodeGenerationStarted += RazorBuildProvider_CodeGenerationStarted;
 
-            if (!_hostingEnvironment.IsHosted) return;
+            if (!hostingEnvironment.IsHosted) return;
 
             var modelsDirectory = _config.ModelsDirectoryAbsolute(_ioHelper);
             if (!Directory.Exists(modelsDirectory))
@@ -73,7 +74,7 @@ namespace Umbraco.ModelsBuilder.Embedded
             // BEWARE! if the watcher is not properly released then for some reason the
             // BuildManager will start confusing types - using a 'registered object' here
             // though we should probably plug into Umbraco's MainDom - which is internal
-            _hostingEnvironment.RegisterObject(this);
+            _hostingLifetime.RegisterObject(this);
             _watcher = new FileSystemWatcher(modelsDirectory);
             _watcher.Changed += WatcherOnChanged;
             _watcher.EnableRaisingEvents = true;
@@ -677,7 +678,7 @@ namespace Umbraco.ModelsBuilder.Embedded
         {
             _watcher.EnableRaisingEvents = false;
             _watcher.Dispose();
-            _hostingEnvironment.UnregisterObject(this);
+            _hostingLifetime.UnregisterObject(this);
         }
 
         #endregion

src/Umbraco.Tests.Common/TestHelperBase.cs

@@ -12,11 +12,11 @@ using Umbraco.Core.Hosting;
 using Umbraco.Core.IO;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Models.PublishedContent;
+using Umbraco.Net;
 using Umbraco.Core.Persistence;
 using Umbraco.Core.Serialization;
 using Umbraco.Core.Strings;
 using Umbraco.Core.Sync;
-using Umbraco.Net;
 using Umbraco.Web;
 using Umbraco.Web.Routing;
 
@@ -31,7 +31,7 @@ namespace Umbraco.Tests.Common
         private UriUtility _uriUtility;
         private IIOHelper _ioHelper;
 
-        public TestHelperBase(Assembly entryAssembly)
+        protected TestHelperBase(Assembly entryAssembly)
         {
             SettingsForTests = new SettingsForTests();            
             MainDom = new SimpleMainDom();
@@ -52,12 +52,8 @@ namespace Umbraco.Tests.Common
             return new RuntimeState(
                 Mock.Of<ILogger>(),
                 Mock.Of<IGlobalSettings>(),
-                new Lazy<IMainDom>(),
-                new Lazy<IServerRegistrar>(),
                 GetUmbracoVersion(),
-                GetHostingEnvironment(),
-                GetBackOfficeInfo()
-                );
+                GetBackOfficeInfo());
         }
 
         public abstract IBackOfficeInfo GetBackOfficeInfo();
@@ -132,6 +128,7 @@ namespace Umbraco.Tests.Common
         }
 
         public abstract IHostingEnvironment GetHostingEnvironment();
+        public abstract IApplicationShutdownRegistry GetHostingEnvironmentLifetime();
 
         public abstract IIpResolver GetIpResolver();
 

src/Umbraco.Tests.Integration/ContainerTests.cs

@@ -1,4 +1,5 @@
-using LightInject;
+using System.Threading.Tasks;
+using LightInject;
 using LightInject.Microsoft.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
@@ -37,7 +38,7 @@ namespace Umbraco.Tests.Integration
             var testHelper = new TestHelper();           
             var runtimeState = Mock.Of<IRuntimeState>();
             var umbracoDatabaseFactory = Mock.Of<IUmbracoDatabaseFactory>();
-            var dbProviderFactoryCreator = Mock.Of<IDbProviderFactoryCreator>();
+            var dbProviderFactoryCreator = Mock.Of<IDbProviderFactoryCreator>();            
             var typeLoader = testHelper.GetMockedTypeLoader();
 
             // Register in the container
@@ -45,7 +46,8 @@ namespace Umbraco.Tests.Integration
                 testHelper.Logger, runtimeState, testHelper.GetConfigs(), testHelper.IOHelper, testHelper.AppCaches);
             composition.RegisterEssentials(testHelper.Logger, testHelper.Profiler, testHelper.Logger, testHelper.MainDom,
                 testHelper.AppCaches, umbracoDatabaseFactory, typeLoader, runtimeState, testHelper.GetTypeFinder(),
-                testHelper.IOHelper, testHelper.GetUmbracoVersion(), dbProviderFactoryCreator);
+                testHelper.IOHelper, testHelper.GetUmbracoVersion(), dbProviderFactoryCreator,
+                testHelper.GetHostingEnvironment(), testHelper.GetBackOfficeInfo());
 
             // Cross wire - this would be called by the Host Builder at the very end of ConfigureServices
             var lightInjectServiceProvider = serviceProviderFactory.CreateServiceProvider(umbracoContainer.Container);
@@ -67,6 +69,46 @@ namespace Umbraco.Tests.Integration
             Assertions.AssertContainer(umbracoContainer.Container);
         }
 
+        [Explicit("This test just shows that resolving services from the container before the host is done resolves 2 different instances")]
+        [Test]
+        public async Task BuildServiceProvider_Before_Host_Is_Configured()
+        {
+            // This is a test to show an anti-pattern used in netcore. This should be avoided in all cases if possible.
+            // There's a thread about this here: https://github.com/dotnet/aspnetcore/issues/14587
+            // For some reason we are not being warned about this with our code analysis since we are using it
+            // in a couple of places but we should really try to see if we can avoid it.
+            // The test below shows how it could be possible to resolve an instance and then re-register it as a factory
+            // so that only one singleton instance is every created, but it's hacky and like Fowler says in that article
+            // it means the container won't be disposed, and maybe other services? not sure.
+            // In cases where we use it can we use IConfigureOptions? https://andrewlock.net/access-services-inside-options-and-startup-using-configureoptions/
+
+            var umbracoContainer = RuntimeTests.GetUmbracoContainer(out var serviceProviderFactory);
+
+            IHostApplicationLifetime lifetime1 = null;
+
+            var hostBuilder = new HostBuilder()
+                .UseUmbraco(serviceProviderFactory)
+                .ConfigureServices((hostContext, services) =>
+                {
+                    // Resolve a service from the netcore container before the host has finished the ConfigureServices sequence
+                    lifetime1 = services.BuildServiceProvider().GetRequiredService<IHostApplicationLifetime>();
+
+                    // Re-add as a callback, ensures its the same instance all the way through (hack)
+                    services.AddSingleton<IHostApplicationLifetime>(x => lifetime1);
+                });
+
+            var host = await hostBuilder.StartAsync();
+
+            var lifetime2 = host.Services.GetRequiredService<IHostApplicationLifetime>();
+            var lifetime3 = umbracoContainer.GetInstance<IHostApplicationLifetime>();
+
+            lifetime1.StopApplication();
+            Assert.IsTrue(lifetime1.ApplicationStopping.IsCancellationRequested);
+            Assert.AreEqual(lifetime1.ApplicationStopping.IsCancellationRequested, lifetime2.ApplicationStopping.IsCancellationRequested);
+            Assert.AreEqual(lifetime1.ApplicationStopping.IsCancellationRequested, lifetime3.ApplicationStopping.IsCancellationRequested);
+
+        }
+
         private class Foo
         {
             public Foo()

src/Umbraco.Tests.Integration/Implementations/HostBuilderExtensions.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+using System.Data.SqlClient;
+using System.IO;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using Umbraco.Core;
+using Umbraco.Tests.Integration.Testing;
+
+namespace Umbraco.Tests.Integration.Implementations
+{
+    public static class HostBuilderExtensions
+    {
+        
+        public static IHostBuilder UseLocalDb(this IHostBuilder hostBuilder, string dbFilePath)
+        {
+            // Need to register SqlClient manually
+            // TODO: Move this to someplace central
+            DbProviderFactories.RegisterFactory(Constants.DbProviderNames.SqlServer, SqlClientFactory.Instance);
+
+            hostBuilder.ConfigureAppConfiguration(x =>
+            {
+                if (!Directory.Exists(dbFilePath))
+                    Directory.CreateDirectory(dbFilePath);
+
+                var dbName = Guid.NewGuid().ToString("N");
+                var instance = TestLocalDb.EnsureLocalDbInstanceAndDatabase(dbName, dbFilePath);
+
+                x.AddInMemoryCollection(new[]
+                {
+                    new KeyValuePair<string, string>($"ConnectionStrings:{Constants.System.UmbracoConnectionName}", instance.GetConnectionString(dbName))
+                });
+            });
+            return hostBuilder;
+        }
+
+        
+    }
+
+
+}

src/Umbraco.Tests.Integration/Implementations/TestDbProviderFactoryCreator.cs

@@ -1,34 +0,0 @@
-using System.Data.Common;
-using Umbraco.Core.Persistence;
-using Umbraco.Core.Persistence.SqlSyntax;
-
-namespace Umbraco.Tests.Integration.Implementations
-{
-    public class TestDbProviderFactoryCreator : IDbProviderFactoryCreator
-    {
-        public IBulkSqlInsertProvider CreateBulkSqlInsertProvider(string providerName)
-        {
-            throw new System.NotImplementedException();
-        }
-
-        public void CreateDatabase()
-        {
-            throw new System.NotImplementedException();
-        }
-
-        public DbProviderFactory CreateFactory()
-        {
-            throw new System.NotImplementedException();
-        }
-
-        public DbProviderFactory CreateFactory(string providerName)
-        {
-            throw new System.NotImplementedException();
-        }
-
-        public ISqlSyntaxProvider GetSqlSyntaxProvider(string providerName)
-        {
-            throw new System.NotImplementedException();
-        }
-    }
-}

src/Umbraco.Tests.Integration/Implementations/TestHelper.cs

@@ -3,14 +3,16 @@ using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Hosting;
 using Moq;
+using System.Data.Common;
 using System.Net;
 using Umbraco.Core;
 using Umbraco.Core.Cache;
 using Umbraco.Core.Diagnostics;
+using Umbraco.Core.Hosting;
 using Umbraco.Core.Logging;
+using Umbraco.Net;
 using Umbraco.Core.Persistence;
 using Umbraco.Core.Runtime;
-using Umbraco.Net;
 using Umbraco.Tests.Common;
 using Umbraco.Web.BackOffice;
 using Umbraco.Web.BackOffice.AspNetCore;
@@ -18,11 +20,11 @@ using IHostingEnvironment = Umbraco.Core.Hosting.IHostingEnvironment;
 
 namespace Umbraco.Tests.Integration.Implementations
 {
-
     public class TestHelper : TestHelperBase
     {
         private IBackOfficeInfo _backOfficeInfo;
         private readonly IHostingEnvironment _hostingEnvironment;
+        private readonly IApplicationShutdownRegistry _hostingLifetime;
         private readonly IIpResolver _ipResolver;
         private readonly IWebHostEnvironment _hostEnvironment;
         private readonly IHttpContextAccessor _httpContextAccessor;
@@ -39,11 +41,12 @@ namespace Umbraco.Tests.Integration.Implementations
                 && x.ContentRootPath == CurrentAssemblyDirectory
                 && x.WebRootPath == CurrentAssemblyDirectory); // same folder for now?
 
-            _hostingEnvironment = new AspNetCoreHostingEnvironment(
+            _hostingEnvironment = new TestHostingEnvironment(
                 SettingsForTests.GetDefaultHostingSettings(),
                 _hostEnvironment,
-                _httpContextAccessor,
-                Mock.Of<IHostApplicationLifetime>());
+                _httpContextAccessor);
+
+            _hostingLifetime = new AspNetCoreApplicationShutdownRegistry(Mock.Of<IHostApplicationLifetime>());
 
             Logger = new ProfilingLogger(new ConsoleLogger(new MessageTemplates()), Profiler);
         }
@@ -60,7 +63,7 @@ namespace Umbraco.Tests.Integration.Implementations
 
         public IWebHostEnvironment GetWebHostEnvironment() => _hostEnvironment;
 
-        public override IDbProviderFactoryCreator DbProviderFactoryCreator => new TestDbProviderFactoryCreator();
+        public override IDbProviderFactoryCreator DbProviderFactoryCreator => new SqlServerDbProviderFactoryCreator(Constants.DbProviderNames.SqlServer, DbProviderFactories.GetFactory);
 
         public override IBulkSqlInsertProvider BulkSqlInsertProvider => new SqlServerBulkSqlInsertProvider();
 
@@ -74,7 +77,9 @@ namespace Umbraco.Tests.Integration.Implementations
         }
 
         public override IHostingEnvironment GetHostingEnvironment() => _hostingEnvironment;
+        public override IApplicationShutdownRegistry GetHostingEnvironmentLifetime() => _hostingLifetime;
 
         public override IIpResolver GetIpResolver() => _ipResolver;
+
     }
 }

src/Umbraco.Tests.Integration/Implementations/TestHostingEnvironment.cs

@@ -0,0 +1,23 @@
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Umbraco.Core.Configuration;
+using Umbraco.Web.BackOffice.AspNetCore;
+
+namespace Umbraco.Tests.Integration.Implementations
+{
+    
+    public class TestHostingEnvironment : AspNetCoreHostingEnvironment, Umbraco.Core.Hosting.IHostingEnvironment
+    {
+        public TestHostingEnvironment(IHostingSettings hostingSettings, IWebHostEnvironment webHostEnvironment, IHttpContextAccessor httpContextAccessor) : base(hostingSettings, webHostEnvironment, httpContextAccessor)
+        {
+        }
+
+        /// <summary>
+        /// Override for tests since we are not hosted
+        /// </summary>
+        /// <remarks>
+        /// This is specifically used by IOHelper and we want this to return false so that the root path is manually calcualted which is what we want for tests.
+        /// </remarks>
+        bool Umbraco.Core.Hosting.IHostingEnvironment.IsHosted { get; } = false;
+    }
+}

src/Umbraco.Tests.Integration/Implementations/TestLifetime.cs

@@ -0,0 +1,18 @@
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Hosting;
+
+namespace Umbraco.Tests.Integration.Implementations
+{
+    /// <summary>
+    /// Ensures the host lifetime ends as soon as code execution is done
+    /// </summary>
+    public class TestLifetime : IHostLifetime
+    {
+        public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
+
+        public Task WaitForStartAsync(CancellationToken cancellationToken) => Task.CompletedTask;
+    }
+
+   
+}

src/Umbraco.Tests.Integration/RuntimeTests.cs

@@ -7,41 +7,76 @@ using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using Moq;
 using NUnit.Framework;
+using System.Collections.Generic;
+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
 using Umbraco.Core;
 using Umbraco.Core.Composing;
+using Umbraco.Core.Composing.LightInject;
 using Umbraco.Core.Logging;
+using Umbraco.Core.Migrations.Install;
+using Umbraco.Core.Persistence;
 using Umbraco.Core.Runtime;
 using Umbraco.Tests.Common;
 using Umbraco.Tests.Integration.Implementations;
+using Umbraco.Tests.Integration.Testing;
 using Umbraco.Web.BackOffice.AspNetCore;
+using static Umbraco.Core.Migrations.Install.DatabaseBuilder;
 
 namespace Umbraco.Tests.Integration
 {
+
     [TestFixture]
     public class RuntimeTests
     {
+        [TearDown]
+        public void TearDown()
+        {
+            MyComponent.Reset();
+            MyComposer.Reset();
+        }
+
+        [OneTimeTearDown]
+        public void FixtureTearDown()
+        {
+            TestLocalDb.Cleanup();
+        }
+
+        /// <summary>
+        /// Manually configure the containers/dependencies and call Boot on Core runtime
+        /// </summary>
         [Test]
-        public void BootCoreRuntime()
+        public void Boot_Core_Runtime()
         {
             // LightInject / Umbraco
             var container = UmbracoServiceProviderFactory.CreateServiceContainer();
             var serviceProviderFactory = new UmbracoServiceProviderFactory(container);
             var umbracoContainer = serviceProviderFactory.GetContainer();            
 
-            // Create the core runtime
+            // Special case since we are not using the Generic Host, we need to manually add an AspNetCore service to the container
+            umbracoContainer.Register(x => Mock.Of<IHostApplicationLifetime>());
+            
             var testHelper = new TestHelper();
+
+            // Create the core runtime
             var coreRuntime = new CoreRuntime(testHelper.GetConfigs(), testHelper.GetUmbracoVersion(),
                 testHelper.IOHelper, testHelper.Logger, testHelper.Profiler, testHelper.UmbracoBootPermissionChecker,
                 testHelper.GetHostingEnvironment(), testHelper.GetBackOfficeInfo(), testHelper.DbProviderFactoryCreator,
                 testHelper.MainDom, testHelper.GetTypeFinder());
 
-            // boot it!
-            var factory = coreRuntime.Boot(umbracoContainer);
+                // boot it!
+            var factory = coreRuntime.Configure(umbracoContainer);
 
             Assert.IsTrue(coreRuntime.MainDom.IsMainDom);
             Assert.IsNull(coreRuntime.State.BootFailedException);
             Assert.AreEqual(RuntimeLevel.Install, coreRuntime.State.Level);            
             Assert.IsTrue(MyComposer.IsComposed);
+            Assert.IsFalse(MyComponent.IsInit);
+            Assert.IsFalse(MyComponent.IsTerminated);
+
+            coreRuntime.Start();
+
             Assert.IsTrue(MyComponent.IsInit);
             Assert.IsFalse(MyComponent.IsTerminated);
 
@@ -52,40 +87,150 @@ namespace Umbraco.Tests.Integration
             Assert.IsTrue(MyComponent.IsTerminated);
         }
 
+        /// <summary>
+        /// Calling AddUmbracoCore to configure the container 
+        /// </summary>
         [Test]
-        public void AddUmbracoCore()
+        public async Task AddUmbracoCore()
         {
+            var umbracoContainer = GetUmbracoContainer(out var serviceProviderFactory);
             var testHelper = new TestHelper();
 
-            // MSDI
-            var services = new ServiceCollection();
-            // These services are required
-            services.AddSingleton<IHttpContextAccessor>(x => testHelper.GetHttpContextAccessor());
-            services.AddSingleton<IWebHostEnvironment>(x => testHelper.GetWebHostEnvironment());
-            services.AddSingleton<IHostApplicationLifetime>(x => Mock.Of<IHostApplicationLifetime>());
+            var hostBuilder = new HostBuilder()
+                .UseUmbraco(serviceProviderFactory)
+                .ConfigureServices((hostContext, services) =>
+                {
+                    var webHostEnvironment = testHelper.GetWebHostEnvironment();
+                    AddRequiredNetCoreServices(services, testHelper, webHostEnvironment);
 
-            // LightInject / Umbraco
-            var container = UmbracoServiceProviderFactory.CreateServiceContainer();
-            var serviceProviderFactory = new UmbracoServiceProviderFactory(container);
-            var umbracoContainer = serviceProviderFactory.GetContainer();
+                    // Add it!
+                    services.AddUmbracoConfiguration(hostContext.Configuration);
+                    services.AddUmbracoCore(webHostEnvironment, umbracoContainer, GetType().Assembly);
+                });
 
-            // Some IConfiguration must exist in the container first
-            var configurationBuilder = new ConfigurationBuilder();
-            configurationBuilder.AddEnvironmentVariables();
-            services.AddSingleton<IConfiguration>(x => configurationBuilder.Build());
-
-            // Add it!
-            services.AddUmbracoConfiguration();
-            services.AddUmbracoCore(umbracoContainer, GetType().Assembly);
+            var host = await hostBuilder.StartAsync();
+            var app = new ApplicationBuilder(host.Services);
 
             // assert results
-            var runtimeState = umbracoContainer.GetInstance<IRuntimeState>();
-            var mainDom = umbracoContainer.GetInstance<IMainDom>();
+            var runtimeState = app.ApplicationServices.GetRequiredService<IRuntimeState>();
+            var mainDom = app.ApplicationServices.GetRequiredService<IMainDom>();
+
+            Assert.IsFalse(mainDom.IsMainDom); // We haven't "Started" the runtime yet
+            Assert.IsNull(runtimeState.BootFailedException);
+            Assert.AreEqual(RuntimeLevel.Install, runtimeState.Level);
+            Assert.IsFalse(MyComponent.IsInit); // We haven't "Started" the runtime yet
+
+            await host.StopAsync();
+
+            Assert.IsFalse(MyComponent.IsTerminated); // we didn't "Start" the runtime so nothing was registered for shutdown
+        }
+
+        /// <summary>
+        /// Calling AddUmbracoCore to configure the container and UseUmbracoCore to start the runtime
+        /// </summary>
+        /// <returns></returns>
+        [Test]
+        public async Task UseUmbracoCore()
+        {
+            var umbracoContainer = GetUmbracoContainer(out var serviceProviderFactory);
+            var testHelper = new TestHelper();
+
+            var hostBuilder = new HostBuilder()
+                .UseUmbraco(serviceProviderFactory)
+                .ConfigureServices((hostContext, services) =>
+                {
+                    var webHostEnvironment = testHelper.GetWebHostEnvironment();
+                    AddRequiredNetCoreServices(services, testHelper, webHostEnvironment);
+
+                    // Add it!
+                    services.AddUmbracoConfiguration(hostContext.Configuration);
+                    services.AddUmbracoCore(webHostEnvironment, umbracoContainer, GetType().Assembly);
+                });
+
+            var host = await hostBuilder.StartAsync();
+            var app = new ApplicationBuilder(host.Services);
+
+            app.UseUmbracoCore();
+
+
+            // assert results
+            var runtimeState = app.ApplicationServices.GetRequiredService<IRuntimeState>();
+            var mainDom = app.ApplicationServices.GetRequiredService<IMainDom>();
 
             Assert.IsTrue(mainDom.IsMainDom);
             Assert.IsNull(runtimeState.BootFailedException);
             Assert.AreEqual(RuntimeLevel.Install, runtimeState.Level);
-            Assert.IsTrue(MyComposer.IsComposed);
+            Assert.IsTrue(MyComponent.IsInit);
+
+            await host.StopAsync();
+
+            Assert.IsTrue(MyComponent.IsTerminated);
+        }
+
+        [Test]
+        public async Task Install_Database()
+        {
+            var umbracoContainer = GetUmbracoContainer(out var serviceProviderFactory);
+            var testHelper = new TestHelper();
+
+            var hostBuilder = new HostBuilder()
+                //TODO: Need to have a configured umb version for the runtime state
+                .UseLocalDb(Path.Combine(testHelper.CurrentAssemblyDirectory, "LocalDb"))
+                .UseUmbraco(serviceProviderFactory)
+                .ConfigureServices((hostContext, services) =>
+                {
+                    var webHostEnvironment = testHelper.GetWebHostEnvironment();
+                    AddRequiredNetCoreServices(services, testHelper, webHostEnvironment);
+
+                    // Add it!
+                    services.AddUmbracoConfiguration(hostContext.Configuration);
+                    services.AddUmbracoCore(webHostEnvironment, umbracoContainer, GetType().Assembly);
+                });
+
+            var host = await hostBuilder.StartAsync();
+            var app = new ApplicationBuilder(host.Services);
+
+            app.UseUmbracoCore();
+
+
+            var runtimeState = (RuntimeState)app.ApplicationServices.GetRequiredService<IRuntimeState>();
+            Assert.AreEqual(RuntimeLevel.Install, runtimeState.Level);
+
+            var dbBuilder = app.ApplicationServices.GetRequiredService<DatabaseBuilder>();
+            Assert.IsNotNull(dbBuilder);
+
+            var canConnect = dbBuilder.CanConnectToDatabase;
+            Assert.IsTrue(canConnect);
+
+            var dbResult = dbBuilder.CreateSchemaAndData();
+            Assert.IsTrue(dbResult.Success);
+
+            // TODO: Get this to work ... but to do that we need to mock or pass in a current umbraco version
+            //var dbFactory = app.ApplicationServices.GetRequiredService<IUmbracoDatabaseFactory>();
+            //var profilingLogger = app.ApplicationServices.GetRequiredService<IProfilingLogger>();
+            //runtimeState.DetermineRuntimeLevel(dbFactory, profilingLogger);
+            //Assert.AreEqual(RuntimeLevel.Run, runtimeState.Level);
+        }
+
+        internal static LightInjectContainer GetUmbracoContainer(out UmbracoServiceProviderFactory serviceProviderFactory)
+        {
+            var container = UmbracoServiceProviderFactory.CreateServiceContainer();
+            serviceProviderFactory = new UmbracoServiceProviderFactory(container);
+            var umbracoContainer = serviceProviderFactory.GetContainer();
+            return umbracoContainer;
+        }
+
+        /// <summary>
+        /// These services need to be manually added because they do not get added by the generic host
+        /// </summary>
+        /// <param name="services"></param>
+        /// <param name="testHelper"></param>
+        /// <param name="webHostEnvironment"></param>
+        private void AddRequiredNetCoreServices(IServiceCollection services, TestHelper testHelper, IWebHostEnvironment webHostEnvironment)
+        {
+            services.AddSingleton<IHttpContextAccessor>(x => testHelper.GetHttpContextAccessor());
+            // the generic host does add IHostEnvironment but not this one because we are not actually in a web context
+            services.AddSingleton<IWebHostEnvironment>(x => webHostEnvironment);
         }
 
         [RuntimeLevel(MinLevel = RuntimeLevel.Install)]
@@ -97,6 +242,11 @@ namespace Umbraco.Tests.Integration
                 IsComposed = true;
             }
 
+            public static void Reset()
+            {
+                IsComposed = false;
+            }
+
             public static bool IsComposed { get; private set; }
         }
 
@@ -121,6 +271,12 @@ namespace Umbraco.Tests.Integration
             {
                 IsTerminated = true;
             }
+
+            public static void Reset()
+            {
+                IsTerminated = false;
+                IsInit = false;
+            }
         }
     }
 

src/Umbraco.Tests.Integration/Testing/TestLocalDb.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Umbraco.Core.Persistence;
+
+namespace Umbraco.Tests.Integration.Testing
+{
+    public static class TestLocalDb
+    {
+        private const string LocalDbInstanceName = "UmbTests";
+
+        private static LocalDb LocalDb { get; } = new LocalDb();
+
+        // TODO: We need to borrow logic from this old branch, this is the latest commit at the old branch where we had LocalDb
+        // working for tests. There's a lot of hoops to jump through to make it work 'fast'. Turns out it didn't actually run as
+        // fast as SqlCe due to the dropping/creating of DB instances since that is faster in SqlCe but this code was all heavily
+        // optimized to go as fast as possible.
+        // see https://github.com/umbraco/Umbraco-CMS/blob/3a8716ac7b1c48b51258724337086cd0712625a1/src/Umbraco.Tests/TestHelpers/LocalDbTestDatabase.cs
+        internal static LocalDb.Instance EnsureLocalDbInstanceAndDatabase(string dbName, string dbFilePath)
+        {
+            if (!LocalDb.InstanceExists(LocalDbInstanceName) && !LocalDb.CreateInstance(LocalDbInstanceName))
+            {
+                throw new InvalidOperationException(
+                    $"Failed to create LocalDb instance {LocalDbInstanceName}, assuming LocalDb is not really available.");
+            }
+
+            var instance = LocalDb.GetInstance(LocalDbInstanceName);
+
+            if (instance == null)
+            {
+                throw new InvalidOperationException(
+                    $"Failed to get LocalDb instance {LocalDbInstanceName}, assuming LocalDb is not really available.");
+            }
+
+            instance.CreateDatabase(dbName, dbFilePath);
+
+            return instance;
+        }
+
+        public static void Cleanup()
+        {
+            var instance = LocalDb.GetInstance(LocalDbInstanceName);
+            if (instance != null)
+            {
+                instance.DropDatabases();
+            }
+        }
+    }
+}

src/Umbraco.Tests.Integration/Umbraco.Tests.Integration.csproj

@@ -15,6 +15,7 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
+        <PackageReference Include="System.Data.SqlClient" Version="4.8.1" />
     </ItemGroup>
 
     <ItemGroup>

src/Umbraco.Tests/LegacyXmlPublishedCache/XmlPublishedSnapshotService.cs

@@ -41,6 +41,7 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
         private readonly IEntityXmlSerializer _entitySerializer;
         private readonly IVariationContextAccessor _variationContextAccessor;
         private readonly IUmbracoContextAccessor _umbracoContextAccessor;
+        private readonly IApplicationShutdownRegistry _hostingLifetime;
         private readonly IHostingEnvironment _hostingEnvironment;
 
         #region Constructors
@@ -57,6 +58,7 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
             ILogger logger,
             IGlobalSettings globalSettings,
             IHostingEnvironment hostingEnvironment,
+            IApplicationShutdownRegistry hostingLifetime,
             IShortStringHelper shortStringHelper,
             ISiteDomainHelper siteDomainHelper,
             IEntityXmlSerializer entitySerializer,
@@ -67,7 +69,7 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
                 publishedSnapshotAccessor, variationContextAccessor, umbracoContextAccessor,
                 documentRepository, mediaRepository, memberRepository,
                 defaultCultureAccessor,
-                logger, globalSettings, hostingEnvironment, shortStringHelper, siteDomainHelper, entitySerializer, null, mainDom, testing, enableRepositoryEvents)
+                logger, globalSettings, hostingEnvironment, hostingLifetime, shortStringHelper, siteDomainHelper, entitySerializer, null, mainDom, testing, enableRepositoryEvents)
         {
             _umbracoContextAccessor = umbracoContextAccessor;
         }
@@ -84,6 +86,7 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
             ILogger logger,
             IGlobalSettings globalSettings,
             IHostingEnvironment hostingEnvironment,
+            IApplicationShutdownRegistry hostingLifetime,
             IShortStringHelper shortStringHelper,
             ISiteDomainHelper siteDomainHelper,
             IEntityXmlSerializer entitySerializer,
@@ -99,7 +102,7 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
 
             _xmlStore = new XmlStore(serviceContext.ContentTypeService, serviceContext.ContentService, scopeProvider, _routesCache,
                 _contentTypeCache, publishedSnapshotAccessor, mainDom, testing, enableRepositoryEvents,
-                documentRepository, mediaRepository, memberRepository, globalSettings, entitySerializer, hostingEnvironment, shortStringHelper);
+                documentRepository, mediaRepository, memberRepository, entitySerializer, hostingEnvironment, hostingLifetime, shortStringHelper);
 
             _domainService = serviceContext.DomainService;
             _memberService = serviceContext.MemberService;
@@ -113,6 +116,7 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
             _siteDomainHelper = siteDomainHelper;
             _entitySerializer = entitySerializer;
             _hostingEnvironment = hostingEnvironment;
+            _hostingLifetime = hostingLifetime;
         }
 
         public override void Dispose()

src/Umbraco.Tests/LegacyXmlPublishedCache/XmlStore.cs

@@ -45,9 +45,8 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
         private readonly IDocumentRepository _documentRepository;
         private readonly IMediaRepository _mediaRepository;
         private readonly IMemberRepository _memberRepository;
-        private readonly IGlobalSettings _globalSettings;
         private readonly IEntityXmlSerializer _entitySerializer;
-        private readonly IHostingEnvironment _hostingEnvironment;
+        private readonly IApplicationShutdownRegistry _hostingLifetime;
         private readonly IShortStringHelper _shortStringHelper;
         private readonly IPublishedSnapshotAccessor _publishedSnapshotAccessor;
         private readonly PublishedContentTypeCache _contentTypeCache;
@@ -58,7 +57,6 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
 
         private XmlStoreFilePersister _persisterTask;
         private volatile bool _released;
-        private bool _withRepositoryEvents;
 
         #region Constructors
 
@@ -67,8 +65,8 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
         /// </summary>
         /// <remarks>The default constructor will boot the cache, load data from file or database, /// wire events in order to manage changes, etc.</remarks>
         public XmlStore(IContentTypeService contentTypeService, IContentService contentService, IScopeProvider scopeProvider, RoutesCache routesCache, PublishedContentTypeCache contentTypeCache,
-            IPublishedSnapshotAccessor publishedSnapshotAccessor, MainDom mainDom, IDocumentRepository documentRepository, IMediaRepository mediaRepository, IMemberRepository memberRepository, IGlobalSettings globalSettings, IEntityXmlSerializer entitySerializer, IHostingEnvironment hostingEnvironment, IShortStringHelper shortStringHelper)
-            : this(contentTypeService, contentService, scopeProvider, routesCache, contentTypeCache, publishedSnapshotAccessor, mainDom, false, false, documentRepository, mediaRepository, memberRepository, globalSettings, entitySerializer, hostingEnvironment, shortStringHelper)
+            IPublishedSnapshotAccessor publishedSnapshotAccessor, MainDom mainDom, IDocumentRepository documentRepository, IMediaRepository mediaRepository, IMemberRepository memberRepository, IEntityXmlSerializer entitySerializer, IHostingEnvironment hostingEnvironment, IApplicationShutdownRegistry hostingLifetime, IShortStringHelper shortStringHelper)
+            : this(contentTypeService, contentService, scopeProvider, routesCache, contentTypeCache, publishedSnapshotAccessor, mainDom, false, false, documentRepository, mediaRepository, memberRepository, entitySerializer, hostingEnvironment, hostingLifetime, shortStringHelper)
         { }
 
         // internal for unit tests
@@ -76,7 +74,7 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
         // TODO: er, we DO have a DB?
         internal XmlStore(IContentTypeService contentTypeService, IContentService contentService, IScopeProvider scopeProvider, RoutesCache routesCache, PublishedContentTypeCache contentTypeCache,
             IPublishedSnapshotAccessor publishedSnapshotAccessor, MainDom mainDom,
-            bool testing, bool enableRepositoryEvents, IDocumentRepository documentRepository, IMediaRepository mediaRepository, IMemberRepository memberRepository, IGlobalSettings globalSettings, IEntityXmlSerializer entitySerializer, IHostingEnvironment hostingEnvironment, IShortStringHelper shortStringHelper)
+            bool testing, bool enableRepositoryEvents, IDocumentRepository documentRepository, IMediaRepository mediaRepository, IMemberRepository memberRepository, IEntityXmlSerializer entitySerializer, IHostingEnvironment hostingEnvironment, IApplicationShutdownRegistry hostingLifetime, IShortStringHelper shortStringHelper)
         {
             if (testing == false)
                 EnsureConfigurationIsValid();
@@ -90,12 +88,11 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
             _documentRepository = documentRepository;
             _mediaRepository = mediaRepository;
             _memberRepository = memberRepository;
-            _globalSettings = globalSettings;
             _entitySerializer = entitySerializer;
-            _hostingEnvironment = hostingEnvironment;
+            _hostingLifetime = hostingLifetime;
             _shortStringHelper = shortStringHelper;
 
-            _xmlFileName = TestHelper.IOHelper.MapPath(SystemFiles.GetContentCacheXml(_hostingEnvironment));
+            _xmlFileName = TestHelper.IOHelper.MapPath(SystemFiles.GetContentCacheXml(hostingEnvironment));
 
             if (testing)
             {
@@ -150,7 +147,7 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
                 LongRunning = true,
                 KeepAlive = true,
                 Hosted = false // main domain will take care of stopping the runner (see below)
-            }, logger, _hostingEnvironment);
+            }, logger, _hostingLifetime);
 
             // create (and add to runner)
             _persisterTask = new XmlStoreFilePersister(runner, this, logger);
@@ -207,7 +204,6 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
             MediaTypeService.ScopedRefreshedEntity += OnMediaTypeRefreshedEntity;
             MemberTypeService.ScopedRefreshedEntity += OnMemberTypeRefreshedEntity;
 
-            _withRepositoryEvents = true;
         }
 
         private void ClearEvents()
@@ -226,7 +222,6 @@ namespace Umbraco.Tests.LegacyXmlPublishedCache
             MediaTypeService.ScopedRefreshedEntity -= OnMediaTypeRefreshedEntity;
             MemberTypeService.ScopedRefreshedEntity -= OnMemberTypeRefreshedEntity;
 
-            _withRepositoryEvents = false;
         }
 
         private void LazyInitializeContent()

src/Umbraco.Tests/Routing/UmbracoModuleTests.cs

@@ -32,8 +32,7 @@ namespace Umbraco.Tests.Routing
             //create the module
             var logger = Mock.Of<ILogger>();
             var globalSettings = TestObjects.GetGlobalSettings();
-            var runtime = new RuntimeState(logger,  globalSettings,
-                new Lazy<IMainDom>(), new Lazy<IServerRegistrar>(), UmbracoVersion, HostingEnvironment, BackOfficeInfo);
+            var runtime = new RuntimeState(logger,  globalSettings, UmbracoVersion, BackOfficeInfo);
 
             _module = new UmbracoInjectedModule
             (

src/Umbraco.Tests/Runtimes/CoreRuntimeTests.cs

@@ -104,11 +104,6 @@ namespace Umbraco.Tests.Runtimes
                 return configs;
             }
 
-            private static IProfiler GetProfiler()
-            {
-                return new TestProfiler();
-            }
-
             public IRuntime Runtime { get; private set; }
 
             protected override IRuntime GetRuntime(Configs configs, IUmbracoVersion umbracoVersion, IIOHelper ioHelper, ILogger logger, IProfiler profiler, IHostingEnvironment hostingEnvironment, IBackOfficeInfo backOfficeInfo)
@@ -136,50 +131,14 @@ namespace Umbraco.Tests.Runtimes
                 return mock.Object;
             }
 
-            // FIXME: so how the f* should we do it now?
-            /*
-            // pretend we have the proper migration
-            // else BootFailedException because our mock IUmbracoDatabaseFactory does not provide databases
-            protected override bool EnsureUmbracoUpgradeState(IUmbracoDatabaseFactory databaseFactory)
+            public override IFactory Configure(IRegister container)
             {
-                return true;
-            }
-            */
+                container.Register<IApplicationShutdownRegistry, AspNetApplicationShutdownRegistry>(Lifetime.Singleton);
 
-            // because we don't even have the core runtime component,
-            // there are a few required stuff that we need to compose
-            public override void Compose(Composition composition)
-            {
-                base.Compose(composition);
-
-                var scopeProvider = Mock.Of<IScopeProvider>();
-                Mock.Get(scopeProvider)
-                    .Setup(x => x.CreateScope(
-                        It.IsAny<IsolationLevel>(),
-                        It.IsAny<RepositoryCacheMode>(),
-                        It.IsAny<IEventDispatcher>(),
-                        It.IsAny<bool?>(),
-                        It.IsAny<bool>(),
-                        It.IsAny<bool>()))
-                    .Returns(Mock.Of<IScope>());
-
-                composition.RegisterUnique(scopeProvider);
-            }
-
-            private IMainDom _mainDom;
-
-            public override IFactory Boot(IRegister container)
-            {
-                var factory = base.Boot(container);
-                _mainDom = factory.GetInstance<IMainDom>();
+                var factory = base.Configure(container);
                 return factory;
             }
 
-            public override void Terminate()
-            {
-                base.Terminate();
-            }
-
             // runs with only one single component
             // UmbracoCoreComponent will be force-added too
             // and that's it

src/Umbraco.Tests/Runtimes/StandaloneTests.cs

@@ -72,7 +72,7 @@ namespace Umbraco.Tests.Runtimes
             var mainDom = new SimpleMainDom();
             var umbracoVersion = TestHelper.GetUmbracoVersion();
             var backOfficeInfo = TestHelper.GetBackOfficeInfo();
-            var runtimeState = new RuntimeState(logger, null, new Lazy<IMainDom>(() => mainDom), new Lazy<IServerRegistrar>(() => factory.GetInstance<IServerRegistrar>()), umbracoVersion, hostingEnvironment, backOfficeInfo);
+            var runtimeState = new RuntimeState(logger, null, umbracoVersion, backOfficeInfo);
             var configs = TestHelper.GetConfigs();
             var variationContextAccessor = TestHelper.VariationContextAccessor;
             
@@ -80,11 +80,10 @@ namespace Umbraco.Tests.Runtimes
             // create the register and the composition
             var register = TestHelper.GetRegister();
             var composition = new Composition(register, typeLoader, profilingLogger, runtimeState, configs, ioHelper, appCaches);
-            composition.RegisterEssentials(logger, profiler, profilingLogger, mainDom, appCaches, databaseFactory, typeLoader, runtimeState, typeFinder, ioHelper, umbracoVersion, TestHelper.DbProviderFactoryCreator);
+            composition.RegisterEssentials(logger, profiler, profilingLogger, mainDom, appCaches, databaseFactory, typeLoader, runtimeState, typeFinder, ioHelper, umbracoVersion, TestHelper.DbProviderFactoryCreator, hostingEnvironment, backOfficeInfo);
 
             // create the core runtime and have it compose itself
             var coreRuntime = new CoreRuntime(configs, umbracoVersion, ioHelper, logger, profiler, new AspNetUmbracoBootPermissionChecker(), hostingEnvironment, backOfficeInfo, TestHelper.DbProviderFactoryCreator, TestHelper.MainDom, typeFinder);
-            coreRuntime.Compose(composition);
 
             // determine actual runtime level
             runtimeState.DetermineRuntimeLevel(databaseFactory, logger);
@@ -275,11 +274,10 @@ namespace Umbraco.Tests.Runtimes
             var register = TestHelper.GetRegister();
             var composition = new Composition(register, typeLoader, profilingLogger, runtimeState, configs, ioHelper, appCaches);
             var umbracoVersion = TestHelper.GetUmbracoVersion();
-            composition.RegisterEssentials(logger, profiler, profilingLogger, mainDom, appCaches, databaseFactory, typeLoader, runtimeState, typeFinder, ioHelper, umbracoVersion, TestHelper.DbProviderFactoryCreator);
+            composition.RegisterEssentials(logger, profiler, profilingLogger, mainDom, appCaches, databaseFactory, typeLoader, runtimeState, typeFinder, ioHelper, umbracoVersion, TestHelper.DbProviderFactoryCreator, hostingEnvironment, backOfficeInfo);
 
             // create the core runtime and have it compose itself
             var coreRuntime = new CoreRuntime(configs, umbracoVersion, ioHelper, logger, profiler, new AspNetUmbracoBootPermissionChecker(), hostingEnvironment, backOfficeInfo, TestHelper.DbProviderFactoryCreator, TestHelper.MainDom, typeFinder);
-            coreRuntime.Compose(composition);
 
             // get the components
             // all of them?

src/Umbraco.Tests/Scheduling/BackgroundTaskRunnerTests.cs

@@ -19,13 +19,13 @@ namespace Umbraco.Tests.Scheduling
     public class BackgroundTaskRunnerTests
     {
         private ILogger _logger;
-        private IHostingEnvironment _hostingEnvironment;
+        private IApplicationShutdownRegistry _hostingEnvironment;
 
         [OneTimeSetUp]
         public void InitializeFixture()
         {
             _logger = new ConsoleLogger(new MessageTemplates());
-            _hostingEnvironment = TestHelper.GetHostingEnvironment();
+            _hostingEnvironment = TestHelper.GetHostingEnvironmentLifetime();
         }
 
         [Test]
@@ -934,7 +934,7 @@ namespace Umbraco.Tests.Scheduling
         [Test]
         public void SourceTaskTest()
         {
-            var runner = new BackgroundTaskRunner<IBackgroundTask>(new BackgroundTaskRunnerOptions { KeepAlive = true, LongRunning = true }, _logger, TestHelper.GetHostingEnvironment());
+            var runner = new BackgroundTaskRunner<IBackgroundTask>(new BackgroundTaskRunnerOptions { KeepAlive = true, LongRunning = true }, _logger, TestHelper.GetHostingEnvironmentLifetime());
 
             var task = new SourceTask();
             runner.Add(task);

src/Umbraco.Tests/Scheduling/BackgroundTaskRunnerTests2.cs

@@ -22,7 +22,7 @@ namespace Umbraco.Tests.Scheduling
         public async Task ThreadResumeIssue()
         {
             var logger = new DebugDiagnosticsLogger(new MessageTemplates());
-            var runner = new BackgroundTaskRunner<IBackgroundTask>(new BackgroundTaskRunnerOptions { KeepAlive = true, LongRunning = true }, logger, TestHelper.GetHostingEnvironment());
+            var runner = new BackgroundTaskRunner<IBackgroundTask>(new BackgroundTaskRunnerOptions { KeepAlive = true, LongRunning = true }, logger, TestHelper.GetHostingEnvironmentLifetime());
             var work = new ThreadResumeIssueWorkItem();
             runner.Add(work);
 
@@ -77,7 +77,7 @@ namespace Umbraco.Tests.Scheduling
         public async Task DebuggerInterferenceIssue()
         {
             var logger = new DebugDiagnosticsLogger(new MessageTemplates());
-            var runner = new BackgroundTaskRunner<IBackgroundTask>(new BackgroundTaskRunnerOptions { KeepAlive = true, LongRunning = true }, logger, TestHelper.GetHostingEnvironment());
+            var runner = new BackgroundTaskRunner<IBackgroundTask>(new BackgroundTaskRunnerOptions { KeepAlive = true, LongRunning = true }, logger, TestHelper.GetHostingEnvironmentLifetime());
             var taskCompleted = false;
             runner.TaskCompleted += (sender, args) =>
             {

src/Umbraco.Tests/TestHelpers/TestHelper.cs

@@ -21,12 +21,12 @@ using Umbraco.Core.Logging;
 using Umbraco.Core.Models;
 using Umbraco.Core.Models.Entities;
 using Umbraco.Core.Models.PublishedContent;
+using Umbraco.Net;
 using Umbraco.Core.Persistence;
 using Umbraco.Core.PropertyEditors;
 using Umbraco.Core.Serialization;
 using Umbraco.Core.Services;
 using Umbraco.Core.Strings;
-using Umbraco.Net;
 using Umbraco.Tests.Common;
 using Umbraco.Web;
 using Umbraco.Web.Hosting;
@@ -40,7 +40,7 @@ namespace Umbraco.Tests.TestHelpers
     /// </summary>
     public static class TestHelper
     {
-        private static TestHelperInternal _testHelperInternal = new TestHelperInternal();
+        private static readonly TestHelperInternal _testHelperInternal = new TestHelperInternal();
         private class TestHelperInternal : TestHelperBase
         {
             public TestHelperInternal() : base(typeof(TestHelperInternal).Assembly)
@@ -62,6 +62,9 @@ namespace Umbraco.Tests.TestHelpers
             public override IHostingEnvironment GetHostingEnvironment()
                 => new AspNetHostingEnvironment(SettingsForTests.GetDefaultHostingSettings());
 
+            public override IApplicationShutdownRegistry GetHostingEnvironmentLifetime()
+                => new AspNetApplicationShutdownRegistry();
+
             public override IIpResolver GetIpResolver()
                 => new AspNetIpResolver();
         }
@@ -320,6 +323,8 @@ namespace Umbraco.Tests.TestHelpers
 
         public static IHostingEnvironment GetHostingEnvironment() => _testHelperInternal.GetHostingEnvironment();
 
+        public static IApplicationShutdownRegistry GetHostingEnvironmentLifetime() => _testHelperInternal.GetHostingEnvironmentLifetime();
+
         public static IIpResolver GetIpResolver() => _testHelperInternal.GetIpResolver();
 
         public static IRequestCache GetRequestCache() => _testHelperInternal.GetRequestCache();

src/Umbraco.Tests/TestHelpers/TestWithDatabaseBase.cs

@@ -265,6 +265,7 @@ namespace Umbraco.Tests.TestHelpers
                 Logger,
                 Factory.GetInstance<IGlobalSettings>(),
                 HostingEnvironment,
+                HostingLifetime,
                 ShortStringHelper,
                 new SiteDomainHelper(),
                 Factory.GetInstance<IEntityXmlSerializer>(),

src/Umbraco.Tests/Testing/UmbracoTestBase.cs

@@ -51,10 +51,10 @@ using Umbraco.Web.Templates;
 using Umbraco.Web.PropertyEditors;
 using Umbraco.Core.Dictionary;
 using Umbraco.Core.Models;
+using Umbraco.Net;
 using Umbraco.Core.Request;
 using Umbraco.Core.Security;
 using Umbraco.Core.Services;
-using Umbraco.Net;
 using Umbraco.Tests.LegacyXmlPublishedCache;
 using Umbraco.Web.AspNet;
 using Umbraco.Web.Install;
@@ -140,6 +140,7 @@ namespace Umbraco.Tests.Testing
         protected virtual IProfilingLogger ProfilingLogger => Factory.GetInstance<IProfilingLogger>();
 
         protected IHostingEnvironment HostingEnvironment { get; } = new AspNetHostingEnvironment(TestHelpers.SettingsForTests.GetDefaultHostingSettings());
+        protected IApplicationShutdownRegistry HostingLifetime { get; } = new AspNetApplicationShutdownRegistry();
         protected IIpResolver IpResolver => Factory.GetInstance<IIpResolver>();
         protected IBackOfficeInfo BackOfficeInfo => Factory.GetInstance<IBackOfficeInfo>();
         protected AppCaches AppCaches => Factory.GetInstance<AppCaches>();

src/Umbraco.Tests/Web/Mvc/UmbracoViewPageTests.cs

@@ -423,6 +423,7 @@ namespace Umbraco.Tests.Web.Mvc
                 new TestDefaultCultureAccessor(),
                 Current.Logger, TestObjects.GetGlobalSettings(),
                 TestHelper.GetHostingEnvironment(),
+                TestHelper.GetHostingEnvironmentLifetime(),
                 ShortStringHelper,
                 new SiteDomainHelper(),
                 Factory.GetInstance<IEntityXmlSerializer>(),

src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreApplicationShutdownRegistry.cs

@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Concurrent;
+using System.Threading;
+using Microsoft.Extensions.Hosting;
+using Umbraco.Core;
+using Umbraco.Core.Hosting;
+
+namespace Umbraco.Web.BackOffice.AspNetCore
+{
+    public class AspNetCoreApplicationShutdownRegistry : IApplicationShutdownRegistry
+    {
+        private readonly IHostApplicationLifetime _hostApplicationLifetime;
+        private readonly ConcurrentDictionary<IRegisteredObject, RegisteredObjectWrapper> _registeredObjects =
+            new ConcurrentDictionary<IRegisteredObject, RegisteredObjectWrapper>();
+
+        public AspNetCoreApplicationShutdownRegistry(IHostApplicationLifetime hostApplicationLifetime)
+        {
+            _hostApplicationLifetime = hostApplicationLifetime;
+        }
+
+        public void RegisterObject(IRegisteredObject registeredObject)
+        {
+            var wrapped = new RegisteredObjectWrapper(registeredObject);
+            if (!_registeredObjects.TryAdd(registeredObject, wrapped))
+            {
+                throw new InvalidOperationException("Could not register object");
+            }
+
+            var cancellationTokenRegistration = _hostApplicationLifetime.ApplicationStopping.Register(() => wrapped.Stop(true));
+            wrapped.CancellationTokenRegistration = cancellationTokenRegistration;
+        }
+
+        public void UnregisterObject(IRegisteredObject registeredObject)
+        {
+            if (_registeredObjects.TryGetValue(registeredObject, out var wrapped))
+            {
+                wrapped.CancellationTokenRegistration.Unregister();
+            }
+        }
+
+
+        private class RegisteredObjectWrapper
+        {
+            private readonly IRegisteredObject _inner;
+
+            public RegisteredObjectWrapper(IRegisteredObject inner)
+            {
+                _inner = inner;
+            }
+
+            public CancellationTokenRegistration CancellationTokenRegistration { get; set; }
+
+            public void Stop(bool immediate)
+            {
+                _inner.Stop(immediate);
+            }
+        }
+    }
+}

src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreComposer.cs

@@ -0,0 +1,27 @@
+using Microsoft.AspNetCore.Http;
+using Umbraco.Core;
+using Umbraco.Core.Composing;
+using Umbraco.Core.Hosting;
+using Umbraco.Net;
+using Umbraco.Core.Runtime;
+
+namespace Umbraco.Web.BackOffice.AspNetCore
+{
+    /// <summary>
+    /// Adds/replaces AspNetCore specific services
+    /// </summary>
+    [ComposeBefore(typeof(ICoreComposer))]
+    [ComposeAfter(typeof(CoreInitialComposer))]
+    public class AspNetCoreComposer : IComposer
+    {
+        public void Compose(Composition composition)
+        {
+            // AspNetCore specific services
+            composition.RegisterUnique<IHttpContextAccessor, HttpContextAccessor>();
+
+            // Our own netcore implementations
+            composition.RegisterUnique<IUmbracoApplicationLifetime, AspNetCoreUmbracoApplicationLifetime>();
+            composition.RegisterUnique<IApplicationShutdownRegistry, AspNetCoreApplicationShutdownRegistry>();
+        }
+    }
+}

src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreHostingEnvironment.cs

@@ -1,11 +1,8 @@
 using System;
-using System.Collections.Concurrent;
-using System.Diagnostics;
+using System.Globalization;
 using System.IO;
-using System.Threading;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
-using Microsoft.Extensions.Hosting;
 using Umbraco.Core;
 using Umbraco.Core.Configuration;
 
@@ -13,30 +10,29 @@ namespace Umbraco.Web.BackOffice.AspNetCore
 {
     public class AspNetCoreHostingEnvironment : Umbraco.Core.Hosting.IHostingEnvironment
     {
-        private readonly ConcurrentDictionary<IRegisteredObject, RegisteredObjectWrapper> _registeredObjects =
-            new ConcurrentDictionary<IRegisteredObject, RegisteredObjectWrapper>();
+        
 
         private readonly IHostingSettings _hostingSettings;
         private readonly IWebHostEnvironment _webHostEnvironment;
         private readonly IHttpContextAccessor _httpContextAccessor;
-        private readonly IHostApplicationLifetime _hostApplicationLifetime;
+        
         private string _localTempPath;
 
-        public AspNetCoreHostingEnvironment(IHostingSettings hostingSettings, IWebHostEnvironment webHostEnvironment, IHttpContextAccessor httpContextAccessor, IHostApplicationLifetime hostHostApplicationLifetime)
+        public AspNetCoreHostingEnvironment(IHostingSettings hostingSettings, IWebHostEnvironment webHostEnvironment, IHttpContextAccessor httpContextAccessor)
         {
             _hostingSettings = hostingSettings ?? throw new ArgumentNullException(nameof(hostingSettings));
             _webHostEnvironment = webHostEnvironment;
             _httpContextAccessor = httpContextAccessor;
-            _hostApplicationLifetime = hostHostApplicationLifetime;
 
             SiteName = webHostEnvironment.ApplicationName;
             ApplicationId = AppDomain.CurrentDomain.Id.ToString();
             ApplicationPhysicalPath = webHostEnvironment.ContentRootPath;
 
             ApplicationVirtualPath = "/"; //TODO how to find this, This is a server thing, not application thing.
-             IISVersion = new Version(0, 0); // TODO not necessary IIS
+            IISVersion = new Version(0, 0); // TODO not necessary IIS
             IsDebugMode =  _hostingSettings.DebugMode;
         }
+
         public bool IsHosted { get; } = true;
         public string SiteName { get; }
         public string ApplicationId { get; }
@@ -56,7 +52,10 @@ namespace Umbraco.Web.BackOffice.AspNetCore
                 switch (_hostingSettings.LocalTempStorageLocation)
                 {
                     case LocalTempStorage.AspNetTemp:
-                         return _localTempPath = System.IO.Path.Combine(Path.GetTempPath(),ApplicationId,  "UmbracoData");
+
+                        // TODO: I don't think this is correct? but also we probably can remove AspNetTemp as an option entirely
+                        // since this is legacy and we shouldn't use it
+                         return _localTempPath = System.IO.Path.Combine(Path.GetTempPath(), ApplicationId, "UmbracoData");
 
                     case LocalTempStorage.EnvironmentTemp:
 
@@ -84,8 +83,11 @@ namespace Umbraco.Web.BackOffice.AspNetCore
             }
         }
 
-        // TODO: This may need to take into account ~/ paths which means the ApplicationVirtualPath and is this the content root or web root?
-        public string MapPath(string path) => Path.Combine(_webHostEnvironment.WebRootPath, path);
+        public string MapPath(string path)
+        {
+            var newPath = path.TrimStart('~', '/').Replace('/', Path.DirectorySeparatorChar);
+            return Path.Combine(_webHostEnvironment.WebRootPath, newPath);
+        }
 
         // TODO: Need to take into account 'root' here
         public string ToAbsolute(string virtualPath, string root)
@@ -101,43 +103,7 @@ namespace Umbraco.Web.BackOffice.AspNetCore
             return applicationPath.Add(segment).Value;
         }
 
-        public void RegisterObject(IRegisteredObject registeredObject)
-        {
-            var wrapped = new RegisteredObjectWrapper(registeredObject);
-            if (!_registeredObjects.TryAdd(registeredObject, wrapped))
-            {
-                throw new InvalidOperationException("Could not register object");
-            }
-
-            var cancellationTokenRegistration = _hostApplicationLifetime.ApplicationStopping.Register(() => wrapped.Stop(true));
-            wrapped.CancellationTokenRegistration = cancellationTokenRegistration;
-        }
-
-        public void UnregisterObject(IRegisteredObject registeredObject)
-        {
-            if (_registeredObjects.TryGetValue(registeredObject, out var wrapped))
-            {
-                wrapped.CancellationTokenRegistration.Unregister();
-            }
-        }
-
-
-        private class RegisteredObjectWrapper
-        {
-            private readonly IRegisteredObject _inner;
-
-            public RegisteredObjectWrapper(IRegisteredObject inner)
-            {
-                _inner = inner;
-            }
-
-            public CancellationTokenRegistration CancellationTokenRegistration { get; set; }
-
-            public void Stop(bool immediate)
-            {
-                _inner.Stop(immediate);
-            }
-        }
+        
     }
 
 

src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreMarchal.cs

@@ -2,7 +2,7 @@ using System;
 using System.Runtime.InteropServices;
 using Umbraco.Core.Diagnostics;
 
-namespace Umbraco.Web.BackOffice
+namespace Umbraco.Web.BackOffice.AspNetCore
 {
 
     public class AspNetCoreMarchal : IMarchal

src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreUmbracoApplicationLifetime.cs

@@ -3,7 +3,7 @@ using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Hosting;
 using Umbraco.Net;
 
-namespace Umbraco.Web.AspNet
+namespace Umbraco.Web.BackOffice.AspNetCore
 {
     public class AspNetCoreUmbracoApplicationLifetime : IUmbracoApplicationLifetime
     {

src/Umbraco.Web.BackOffice/AspNetCore/UmbracoBackOfficeApplicationBuilderExtensions.cs

@@ -1,5 +1,10 @@
 using System;
 using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Umbraco.Core;
+using Umbraco.Core.Composing;
+using Umbraco.Core.Hosting;
 
 namespace Umbraco.Web.BackOffice.AspNetCore
 {
@@ -7,12 +12,57 @@ namespace Umbraco.Web.BackOffice.AspNetCore
     {
         public static IApplicationBuilder UseUmbracoBackOffice(this IApplicationBuilder app)
         {
-            if (app == null)
-            {
-                throw new ArgumentNullException(nameof(app));
-            }
+            if (app == null) throw new ArgumentNullException(nameof(app));
 
             return app;
         }
+
+        /// <summary>
+        /// Start Umbraco
+        /// </summary>
+        /// <param name="app"></param>
+        /// <returns></returns>
+        public static IApplicationBuilder UseUmbracoCore(this IApplicationBuilder app)
+        {
+            if (app == null) throw new ArgumentNullException(nameof(app));
+
+            // Register a listener for application shutdown in order to terminate the runtime
+            var hostLifetime = app.ApplicationServices.GetRequiredService<IApplicationShutdownRegistry>();
+            var runtime = app.ApplicationServices.GetRequiredService<IRuntime>();
+            var runtimeShutdown = new CoreRuntimeShutdown(runtime, hostLifetime);
+            hostLifetime.RegisterObject(runtimeShutdown);
+
+            // Start the runtime!
+            runtime.Start();
+
+            return app;
+        }
+
+        /// <summary>
+        /// Ensures the runtime is shutdown when the application is shutting down
+        /// </summary>
+        private class CoreRuntimeShutdown : IRegisteredObject
+        {
+            public CoreRuntimeShutdown(IRuntime runtime, IApplicationShutdownRegistry hostLifetime)
+            {
+                _runtime = runtime;
+                _hostLifetime = hostLifetime;
+            }
+
+            private bool _completed = false;
+            private readonly IRuntime _runtime;
+            private readonly IApplicationShutdownRegistry _hostLifetime;
+
+            public void Stop(bool immediate)
+            {
+                if (!_completed)
+                {
+                    _completed = true;
+                    _runtime.Terminate();
+                    _hostLifetime.UnregisterObject(this);
+                }
+
+            }
+        }
     }
 }

src/Umbraco.Web.BackOffice/AspNetCore/UmbracoCoreServiceCollectionExtensions.cs

@@ -6,13 +6,11 @@ using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
-using Umbraco.Composing;
 using Umbraco.Configuration;
 using Umbraco.Core;
 using Umbraco.Core.Cache;
 using Umbraco.Core.Composing;
 using Umbraco.Core.Configuration;
-using Umbraco.Core.Configuration.UmbracoSettings;
 using Umbraco.Core.IO;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Logging.Serilog;
@@ -21,17 +19,18 @@ using Umbraco.Core.Runtime;
 
 namespace Umbraco.Web.BackOffice.AspNetCore
 {
-
-
-    public static class UmbracoBackOfficeServiceCollectionExtensions
+    // TODO: Move to Umbraco.Web.Common
+    public static class UmbracoCoreServiceCollectionExtensions
     {
-
-        public static IServiceCollection AddUmbracoConfiguration(this IServiceCollection services)
+        /// <summary>
+        /// Adds the Umbraco Configuration requirements
+        /// </summary>
+        /// <param name="services"></param>
+        /// <param name="configuration"></param>
+        /// <returns></returns>
+        public static IServiceCollection AddUmbracoConfiguration(this IServiceCollection services, IConfiguration configuration)
         {
-            var serviceProvider = services.BuildServiceProvider();
-            var configuration = serviceProvider.GetService<IConfiguration>();
-            if (configuration == null)
-                throw new InvalidOperationException($"Could not resolve {typeof(IConfiguration)} from the container");
+            if (configuration == null) throw new ArgumentNullException(nameof(configuration));
 
             var configsFactory = new AspNetCoreConfigsFactory(configuration);
 
@@ -44,48 +43,59 @@ namespace Umbraco.Web.BackOffice.AspNetCore
 
 
         /// <summary>
-        ///  Adds the Umbraco Back Core requirements
+        /// Adds the Umbraco Back Core requirements
         /// </summary>
         /// <param name="services"></param>
+        /// <param name="webHostEnvironment"></param>
         /// <returns></returns>
-        /// <remarks>
-        /// Must be called after all services are added to the application because we are cross-wiring the container (currently)
-        /// </remarks>
-        public static IServiceCollection AddUmbracoCore(this IServiceCollection services)
+        public static IServiceCollection AddUmbracoCore(this IServiceCollection services, IWebHostEnvironment webHostEnvironment)
         {
             if (!UmbracoServiceProviderFactory.IsActive)
                 throw new InvalidOperationException("Ensure to add UseUmbraco() in your Program.cs after ConfigureWebHostDefaults to enable Umbraco's service provider factory");
 
             var umbContainer = UmbracoServiceProviderFactory.UmbracoContainer;
 
-            return services.AddUmbracoCore(umbContainer, Assembly.GetEntryAssembly());
+            return services.AddUmbracoCore(webHostEnvironment, umbContainer, Assembly.GetEntryAssembly());
         }
 
-        public static IServiceCollection AddUmbracoCore(this IServiceCollection services, IRegister umbContainer, Assembly entryAssembly)
+        /// <summary>
+        /// Adds the Umbraco Back Core requirements
+        /// </summary>
+        /// <param name="services"></param>
+        /// <param name="webHostEnvironment"></param>
+        /// <param name="umbContainer"></param>
+        /// <param name="entryAssembly"></param>
+        /// <returns></returns>
+        public static IServiceCollection AddUmbracoCore(this IServiceCollection services, IWebHostEnvironment webHostEnvironment, IRegister umbContainer, Assembly entryAssembly)
         {
+            if (services is null) throw new ArgumentNullException(nameof(services));
+            if (umbContainer is null) throw new ArgumentNullException(nameof(umbContainer));
+            if (entryAssembly is null) throw new ArgumentNullException(nameof(entryAssembly));
+
+            // Special case! The generic host adds a few default services but we need to manually add this one here NOW because
+            // we resolve it before the host finishes configuring in the call to CreateCompositionRoot
             services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
 
-            CreateCompositionRoot(services);
+            CreateCompositionRoot(services, webHostEnvironment, out var logger, out var configs, out var ioHelper, out var hostingEnvironment, out var backOfficeInfo, out var profiler);
 
-            // TODO: Get rid of this 'Current' requirement
-            var globalSettings = Current.Configs.Global();
+            var globalSettings = configs.Global();
             var umbracoVersion = new UmbracoVersion(globalSettings);
 
             // TODO: Currently we are not passing in any TypeFinderConfig (with ITypeFinderSettings) which we should do, however
             // this is not critical right now and would require loading in some config before boot time so just leaving this as-is for now.
-            var typeFinder = new TypeFinder(Current.Logger, new DefaultUmbracoAssemblyProvider(entryAssembly));
+            var typeFinder = new TypeFinder(logger, new DefaultUmbracoAssemblyProvider(entryAssembly));
 
             var coreRuntime = GetCoreRuntime(
-                Current.Configs,
+                configs,
                 umbracoVersion,
-                Current.IOHelper,
-                Current.Logger,
-                Current.Profiler,
-                Current.HostingEnvironment,
-                Current.BackOfficeInfo,
+                ioHelper,
+                logger,
+                profiler,
+                hostingEnvironment,
+                backOfficeInfo,
                 typeFinder);
 
-            var factory = coreRuntime.Boot(umbContainer);
+            var factory = coreRuntime.Configure(umbContainer);
 
             return services;
         }
@@ -107,7 +117,7 @@ namespace Umbraco.Web.BackOffice.AspNetCore
                 ? (IMainDomLock)new SqlMainDomLock(logger, globalSettings, connStrings, dbProviderFactoryCreator)
                 : new MainDomSemaphoreLock(logger, hostingEnvironment);
 
-            var mainDom = new MainDom(logger, hostingEnvironment, mainDomLock);
+            var mainDom = new MainDom(logger, mainDomLock);
 
             var coreRuntime = new CoreRuntime(configs, umbracoVersion, ioHelper, logger, profiler, new AspNetCoreBootPermissionsChecker(),
                 hostingEnvironment, backOfficeInfo, dbProviderFactoryCreator, mainDom, typeFinder);
@@ -115,17 +125,16 @@ namespace Umbraco.Web.BackOffice.AspNetCore
             return coreRuntime;
         }
 
-        private static void CreateCompositionRoot(IServiceCollection services)
+        private static void CreateCompositionRoot(IServiceCollection services, IWebHostEnvironment webHostEnvironment,
+            out ILogger logger, out Configs configs, out IIOHelper ioHelper, out Core.Hosting.IHostingEnvironment hostingEnvironment,
+            out IBackOfficeInfo backOfficeInfo, out IProfiler profiler)
         {
-            // TODO: This isn't the best to have to resolve the services now but to avoid this will
-            // require quite a lot of re-work. 
+            // TODO: We need to avoid this, surely there's a way? See ContainerTests.BuildServiceProvider_Before_Host_Is_Configured
             var serviceProvider = services.BuildServiceProvider();
 
             var httpContextAccessor = serviceProvider.GetRequiredService<IHttpContextAccessor>();
-            var webHostEnvironment = serviceProvider.GetRequiredService<IWebHostEnvironment>();
-            var hostApplicationLifetime = serviceProvider.GetRequiredService<IHostApplicationLifetime>();
 
-            var configs = serviceProvider.GetService<Configs>();
+            configs = serviceProvider.GetService<Configs>();
             if (configs == null)
                 throw new InvalidOperationException($"Could not resolve type {typeof(Configs)} from the container, ensure {nameof(AddUmbracoConfiguration)} is called before calling {nameof(AddUmbracoCore)}");
 
@@ -133,18 +142,16 @@ namespace Umbraco.Web.BackOffice.AspNetCore
             var coreDebug = configs.CoreDebug();
             var globalSettings = configs.Global();
 
-            var hostingEnvironment = new AspNetCoreHostingEnvironment(hostingSettings, webHostEnvironment, httpContextAccessor, hostApplicationLifetime);
-            var ioHelper = new IOHelper(hostingEnvironment, globalSettings);
-            var logger = SerilogLogger.CreateWithDefaultConfiguration(hostingEnvironment,
+            hostingEnvironment = new AspNetCoreHostingEnvironment(hostingSettings, webHostEnvironment, httpContextAccessor);
+            ioHelper = new IOHelper(hostingEnvironment, globalSettings);
+            logger = SerilogLogger.CreateWithDefaultConfiguration(hostingEnvironment,
                 new AspNetCoreSessionIdResolver(httpContextAccessor),
-                // need to build a new service provider since the one already resolved above doesn't have the IRequestCache yet
+                // TODO: We need to avoid this, surely there's a way? See ContainerTests.BuildServiceProvider_Before_Host_Is_Configured
                 () => services.BuildServiceProvider().GetService<IRequestCache>(), coreDebug, ioHelper,
                 new AspNetCoreMarchal());
 
-            var backOfficeInfo = new AspNetCoreBackOfficeInfo(globalSettings);
-            var profiler = new LogProfiler(logger);
-
-            Current.Initialize(logger, configs, ioHelper, hostingEnvironment, backOfficeInfo, profiler);
+            backOfficeInfo = new AspNetCoreBackOfficeInfo(globalSettings);
+            profiler = new LogProfiler(logger);
         }
 
         private class AspNetCoreBootPermissionsChecker : IUmbracoBootPermissionChecker
@@ -154,5 +161,7 @@ namespace Umbraco.Web.BackOffice.AspNetCore
                 // nothing to check
             }
         }
+
+        
     }
 }

src/Umbraco.Web.UI.NetCore/Startup.cs

@@ -16,13 +16,29 @@ namespace Umbraco.Web.UI.BackOffice
 {
     public class Startup
     {
+        private readonly IWebHostEnvironment _webHostEnvironment;
+        private readonly IConfiguration _config;
+
+        /// <summary>
+        /// Constructor
+        /// </summary>
+        /// <param name="webHostEnvironment"></param>
+        /// <param name="config"></param>
+        /// <remarks>
+        /// Only a few services are possible to be injected here https://github.com/dotnet/aspnetcore/issues/9337
+        /// </remarks>
+        public Startup(IWebHostEnvironment webHostEnvironment, IConfiguration config)
+        {
+            _webHostEnvironment = webHostEnvironment ?? throw new ArgumentNullException(nameof(webHostEnvironment));
+            _config = config ?? throw new ArgumentNullException(nameof(config));
+        }
 
         // This method gets called by the runtime. Use this method to add services to the container.
         // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
         public void ConfigureServices(IServiceCollection services)
         {
-            services.AddUmbracoConfiguration();
-            services.AddUmbracoCore();
+            services.AddUmbracoConfiguration(_config);
+            services.AddUmbracoCore(_webHostEnvironment);
             services.AddUmbracoWebsite();
         }
 

src/Umbraco.Web.Website/AspNetCore/UmbracoWebsiteServiceCollectionExtensions.cs

@@ -19,6 +19,7 @@ namespace Umbraco.Web.Website.AspNetCore
     {
         public static IServiceCollection AddUmbracoWebsite(this IServiceCollection services)
         {
+            // TODO: We need to avoid this, surely there's a way? See ContainerTests.BuildServiceProvider_Before_Host_Is_Configured
             var serviceProvider = services.BuildServiceProvider();
             var configs = serviceProvider.GetService<Configs>();
             var imagingSettings = configs.Imaging();

src/Umbraco.Web/AspNet/AspNetApplicationShutdownRegistry.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Concurrent;
+using System.Web.Hosting;
+using Umbraco.Core.Hosting;
+using IRegisteredObject = Umbraco.Core.IRegisteredObject;
+
+namespace Umbraco.Web.Hosting
+{
+    public class AspNetApplicationShutdownRegistry : IApplicationShutdownRegistry
+    {
+        private readonly ConcurrentDictionary<IRegisteredObject, RegisteredObjectWrapper> _registeredObjects =
+            new ConcurrentDictionary<IRegisteredObject, RegisteredObjectWrapper>();
+
+        public void RegisterObject(IRegisteredObject registeredObject)
+        {
+            var wrapped = new RegisteredObjectWrapper(registeredObject);
+            if (!_registeredObjects.TryAdd(registeredObject, wrapped))
+            {
+                throw new InvalidOperationException("Could not register object");
+            }
+            HostingEnvironment.RegisterObject(wrapped);
+        }
+
+        public void UnregisterObject(IRegisteredObject registeredObject)
+        {
+            if (_registeredObjects.TryGetValue(registeredObject, out var wrapped))
+            {
+                HostingEnvironment.UnregisterObject(wrapped);
+            }
+        }
+
+        private class RegisteredObjectWrapper : System.Web.Hosting.IRegisteredObject
+        {
+            private readonly IRegisteredObject _inner;
+
+            public RegisteredObjectWrapper(IRegisteredObject inner)
+            {
+                _inner = inner;
+            }
+
+            public void Stop(bool immediate)
+            {
+                _inner.Stop(immediate);
+            }
+        }
+    }
+}

src/Umbraco.Web/AspNet/AspNetHostingEnvironment.cs

@@ -1,21 +1,15 @@
 using System;
-using System.Collections;
-using System.Collections.Concurrent;
-using System.Collections.Generic;
 using System.Web;
 using System.Web.Hosting;
 using Umbraco.Core;
 using Umbraco.Core.Configuration;
 using Umbraco.Core.Hosting;
-using Umbraco.Core.IO;
-using IRegisteredObject = Umbraco.Core.IRegisteredObject;
 
 namespace Umbraco.Web.Hosting
 {
     public class AspNetHostingEnvironment : IHostingEnvironment
     {
-        private readonly ConcurrentDictionary<IRegisteredObject, RegisteredObjectWrapper> _registeredObjects =
-            new ConcurrentDictionary<IRegisteredObject, RegisteredObjectWrapper>();
+        
         private readonly IHostingSettings _hostingSettings;
         private string _localTempPath;
 
@@ -46,23 +40,7 @@ namespace Umbraco.Web.Hosting
         }
 
         public string ToAbsolute(string virtualPath, string root) => VirtualPathUtility.ToAbsolute(virtualPath, root);
-        public void RegisterObject(IRegisteredObject registeredObject)
-        {
-            var wrapped = new RegisteredObjectWrapper(registeredObject);
-            if (!_registeredObjects.TryAdd(registeredObject, wrapped))
-            {
-                throw new InvalidOperationException("Could not register object");
-            }
-            HostingEnvironment.RegisterObject(wrapped);
-        }
-
-        public void UnregisterObject(IRegisteredObject registeredObject)
-        {
-            if (_registeredObjects.TryGetValue(registeredObject, out var wrapped))
-            {
-                HostingEnvironment.UnregisterObject(wrapped);
-            }
-        }
+        
 
         public string LocalTempPath
         {
@@ -101,20 +79,7 @@ namespace Umbraco.Web.Hosting
                 }
             }
         }
-        private class RegisteredObjectWrapper : System.Web.Hosting.IRegisteredObject
-        {
-            private readonly IRegisteredObject _inner;
-
-            public RegisteredObjectWrapper(IRegisteredObject inner)
-            {
-                _inner = inner;
-            }
-
-            public void Stop(bool immediate)
-            {
-                _inner.Stop(immediate);
-            }
-        }
+       
     }
 
 

src/Umbraco.Web/AspNet/AspNetSessionManager.cs

@@ -1,6 +1,6 @@
 using System.Web;
-using Umbraco.Core.Session;
 using Umbraco.Net;
+using Umbraco.Core.Session;
 
 namespace Umbraco.Web.AspNet
 {

src/Umbraco.Web/Compose/AuditEventsComponent.cs

@@ -7,10 +7,10 @@ using Umbraco.Core.Configuration;
 using Umbraco.Core.Events;
 using Umbraco.Core.Models;
 using Umbraco.Core.Models.Membership;
+using Umbraco.Net;
 using Umbraco.Core.Security;
 using Umbraco.Core.Services;
 using Umbraco.Core.Services.Implement;
-using Umbraco.Net;
 using Umbraco.Web.Security;
 
 namespace Umbraco.Core.Compose

src/Umbraco.Web/Composing/Current.cs

@@ -11,6 +11,7 @@ using Umbraco.Core.Composing;
 using Umbraco.Core.Configuration;
 using Umbraco.Core.Hosting;
 using Umbraco.Core.Mapping;
+using Umbraco.Net;
 using Umbraco.Core.PackageActions;
 using Umbraco.Core.Packaging;
 using Umbraco.Core.PropertyEditors;
@@ -18,7 +19,6 @@ using Umbraco.Core.Scoping;
 using Umbraco.Core.Services;
 using Umbraco.Core.Strings;
 using Umbraco.Core.Sync;
-using Umbraco.Net;
 using Umbraco.Web.Actions;
 using Umbraco.Web.Cache;
 using Umbraco.Web.Editors;

src/Umbraco.Web/Editors/PackageInstallController.cs

@@ -14,11 +14,11 @@ using Umbraco.Core.Logging;
 using Umbraco.Core.Mapping;
 using Umbraco.Core.Models.Editors;
 using Umbraco.Core.Models.Packaging;
+using Umbraco.Net;
 using Umbraco.Core.Packaging;
 using Umbraco.Core.Persistence;
 using Umbraco.Core.Services;
 using Umbraco.Core.Strings;
-using Umbraco.Net;
 using Umbraco.Web.JavaScript;
 using Umbraco.Web.Models;
 using Umbraco.Web.Models.ContentEditing;

src/Umbraco.Web/Profiling/WebProfilingController.cs

@@ -1,6 +1,7 @@
 using Umbraco.Core;
 using Umbraco.Core.Cache;
 using Umbraco.Core.Configuration;
+using Umbraco.Core.Hosting;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Mapping;
 using Umbraco.Core.Persistence;
@@ -18,7 +19,7 @@ namespace Umbraco.Web.Profiling
     [UmbracoApplicationAuthorize(Core.Constants.Applications.Settings)]
     public class WebProfilingController : UmbracoAuthorizedJsonController
     {
-        private readonly IRuntimeState _runtimeState;
+        private readonly IHostingEnvironment _hosting;
 
         public WebProfilingController(
             IGlobalSettings globalSettings,
@@ -30,17 +31,18 @@ namespace Umbraco.Web.Profiling
             IRuntimeState runtimeState,
             IShortStringHelper shortStringHelper,
             UmbracoMapper umbracoMapper,
-            IPublishedUrlProvider publishedUrlProvider)
+            IPublishedUrlProvider publishedUrlProvider,
+            IHostingEnvironment hosting)
             : base(globalSettings, umbracoContextAccessor, sqlContext, services, appCaches, logger, runtimeState, shortStringHelper, umbracoMapper, publishedUrlProvider)
         {
-            _runtimeState = runtimeState;
+            _hosting = hosting;
         }
 
         public object GetStatus()
         {
             return new
             {
-                Enabled = _runtimeState.Debug
+                Enabled = _hosting.IsDebugMode
             };
         }
     }}

src/Umbraco.Web/Runtime/WebInitialComposer.cs

@@ -18,7 +18,6 @@ using Umbraco.Core.Runtime;
 using Umbraco.Core.Security;
 using Umbraco.Core.Services;
 using Umbraco.Core.Sync;
-using Umbraco.Net;
 using Umbraco.Web.Actions;
 using Umbraco.Web.Cache;
 using Umbraco.Web.Composing.CompositionExtensions;
@@ -46,6 +45,7 @@ using Umbraco.Web.WebApi;
 using Umbraco.Web.PropertyEditors;
 using Umbraco.Examine;
 using Umbraco.Core.Models;
+using Umbraco.Net;
 using Umbraco.Core.Request;
 using Umbraco.Core.Session;
 using Umbraco.Web.AspNet;
@@ -72,8 +72,6 @@ namespace Umbraco.Web.Runtime
 
             composition.Register<IRequestAccessor, AspNetRequestAccessor>(Lifetime.Singleton);
 
-            composition.Register<IHostingEnvironment, AspNetHostingEnvironment>();
-            composition.Register<IBackOfficeInfo, AspNetBackOfficeInfo>();
             composition.Register<IUmbracoApplicationLifetime, AspNetUmbracoApplicationLifetime>(Lifetime.Singleton);
             composition.Register<IPasswordHasher, AspNetPasswordHasher>();
             composition.Register<IFilePermissionHelper, FilePermissionHelper>(Lifetime.Singleton);

src/Umbraco.Web/Security/AppBuilderExtensions.cs

@@ -17,9 +17,9 @@ using Umbraco.Core.Configuration.UmbracoSettings;
 using Umbraco.Core.IO;
 using Umbraco.Core.Mapping;
 using Umbraco.Core.Models.Identity;
+using Umbraco.Net;
 using Umbraco.Core.Security;
 using Umbraco.Core.Services;
-using Umbraco.Net;
 using Umbraco.Web.Composing;
 using Umbraco.Web.Models.Identity;
 using Constants = Umbraco.Core.Constants;

src/Umbraco.Web/Security/BackOfficeUserManager.cs

@@ -9,9 +9,9 @@ using Umbraco.Core.Configuration;
 using Umbraco.Core.Configuration.UmbracoSettings;
 using Umbraco.Core.Mapping;
 using Umbraco.Core.Models.Identity;
+using Umbraco.Net;
 using Umbraco.Core.Security;
 using Umbraco.Core.Services;
-using Umbraco.Net;
 using Umbraco.Web.Models.Identity;
 using IPasswordHasher = Microsoft.AspNet.Identity.IPasswordHasher;
 

src/Umbraco.Web/Security/Providers/UmbracoMembershipProvider.cs

@@ -10,10 +10,10 @@ using Umbraco.Core.Configuration;
 using Umbraco.Core.Hosting;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Models.Membership;
+using Umbraco.Net;
 using Umbraco.Core.Persistence.Querying;
 using Umbraco.Core.Security;
 using Umbraco.Core.Services;
-using Umbraco.Net;
 using Umbraco.Web.Composing;
 
 namespace Umbraco.Web.Security.Providers

src/Umbraco.Web/Umbraco.Web.csproj

@@ -134,6 +134,7 @@
     <Compile Include="AppBuilderExtensions.cs" />
     <Compile Include="AreaRegistrationContextExtensions.cs" />
     <Compile Include="AspNet\AspNetHostingEnvironment.cs" />
+    <Compile Include="AspNet\AspNetApplicationShutdownRegistry.cs" />
     <Compile Include="AspNet\AspNetRequestAccessor.cs" />
     <Compile Include="AspNet\AspNetSessionManager.cs" />
     <Compile Include="AspNet\AspNetUserAgentProvider.cs" />
@@ -585,4 +586,4 @@
     </None>
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
-</Project>
+</Project>

src/Umbraco.Web/UmbracoApplication.cs

@@ -32,7 +32,7 @@ namespace Umbraco.Web
                 ? (IMainDomLock)new SqlMainDomLock(logger, globalSettings, connectionStrings, dbProviderFactoryCreator)
                 : new MainDomSemaphoreLock(logger, hostingEnvironment);
 
-            var mainDom = new MainDom(logger, hostingEnvironment, mainDomLock);
+            var mainDom = new MainDom(logger, mainDomLock);
 
             var requestCache = new HttpRequestAppCache(() => HttpContext.Current?.Items);
             var umbracoBootPermissionChecker = new AspNetUmbracoBootPermissionChecker();

src/Umbraco.Web/UmbracoApplicationBase.cs

@@ -152,7 +152,9 @@ namespace Umbraco.Web
                 Umbraco.Composing.Current.Profiler,
                 Umbraco.Composing.Current.HostingEnvironment,
                 Umbraco.Composing.Current.BackOfficeInfo);
-            _factory = Current.Factory = _runtime.Boot(register);
+            _factory = Current.Factory = _runtime.Configure(register);
+
+            _runtime.Start();
         }
 
         // called by ASP.NET (auto event wireup) once per app domain

src/Umbraco.Web/UmbracoContext.cs

@@ -150,7 +150,7 @@ namespace Umbraco.Web
             {
                 var request = GetRequestFromContext();
                 //NOTE: the request can be null during app startup!
-                return Current.RuntimeState.Debug
+                return Current.HostingEnvironment.IsDebugMode
                        && request != null
                        && (string.IsNullOrEmpty(request["umbdebugshowtrace"]) == false
                            || string.IsNullOrEmpty(request["umbdebug"]) == false

src/Umbraco.Web/UmbracoDefaultOwinStartup.cs

@@ -7,8 +7,8 @@ using Umbraco.Core.Configuration;
 using Umbraco.Core.Configuration.UmbracoSettings;
 using Umbraco.Core.IO;
 using Umbraco.Core.Mapping;
-using Umbraco.Core.Services;
 using Umbraco.Net;
+using Umbraco.Core.Services;
 using Umbraco.Web;
 using Umbraco.Web.Composing;
 using Umbraco.Web.Security;

src/Umbraco.Web/UrlHelperExtensions.cs

@@ -143,12 +143,12 @@ namespace Umbraco.Web
             //in case the user bypasses the installer and just bumps the web.config or client dependency config
 
             //if in debug mode, always burst the cache
-            if (Current.RuntimeState.Debug)
+            if (Current.HostingEnvironment.IsDebugMode)
             {
                 return DateTime.Now.Ticks.ToString(CultureInfo.InvariantCulture).GenerateHash();
             }
 
-            var version = Current.RuntimeState.SemanticVersion.ToSemanticString();
+            var version = Current.UmbracoVersion.SemanticVersion.ToSemanticString();
             return $"{version}.{ClientDependencySettings.Instance.Version}".GenerateHash();
         }
     }