working on U4-5927 - this extends the base event class to have EventMessages which event consumers can add to, the trick is that there is a factory for these EventMessages, in a web context, the factory is a request based factory so that during a request all instances of the EventMessages are the same instance. All services then accept an instance of IEventMessagesFactory which they can then use when raising events. We'll then use this to send messages to the UI. Not sure if i should make this a resolver yet or not. Still a WIP!!

src/Umbraco.Web/WebBootManager.cs

@@ -38,6 +38,10 @@ using Umbraco.Web.Scheduling;
 using Umbraco.Web.UI.JavaScript;
 using Umbraco.Web.WebApi;
 using umbraco.BusinessLogic;
+using Umbraco.Core.Persistence;
+using Umbraco.Core.Persistence.UnitOfWork;
+using Umbraco.Core.Publishing;
+using Umbraco.Core.Services;
 using GlobalSettings = Umbraco.Core.Configuration.GlobalSettings;
 using ProfilingViewEngine = Umbraco.Core.Profiling.ProfilingViewEngine;
 
@@ -71,6 +75,25 @@ namespace Umbraco.Web
             _isForTesting = isForTesting;
         }
 
+        /// <summary>
+        /// Creates and returns the service context for the app
+        /// </summary>
+        /// <param name="dbContext"></param>
+        /// <param name="dbFactory"></param>
+        /// <returns></returns>
+        protected override ServiceContext CreateServiceContext(DatabaseContext dbContext, IDatabaseFactory dbFactory)
+        {
+            return new ServiceContext(
+                new RepositoryFactory(ApplicationCache, ProfilingLogger.Logger, dbContext.SqlSyntax, UmbracoConfig.For.UmbracoSettings()),
+                new PetaPocoUnitOfWorkProvider(dbFactory),
+                new FileUnitOfWorkProvider(),
+                new PublishingStrategy(),
+                ApplicationCache,
+                ProfilingLogger.Logger,
+                //use a request based messaging factory
+                new RequestLifespanMessagesFactory(new SingletonUmbracoContextAccessor()));
+        }
+
         /// <summary>
         /// Initialize objects before anything during the boot cycle happens
         /// </summary>
@@ -157,15 +180,7 @@ namespace Umbraco.Web
             //Set the profiler to be the web profiler
             ProfilerResolver.Current.SetProfiler(new WebProfiler());
         }
-
-        /// <summary>
-        /// Adds custom types to the ApplicationEventsResolver
-        /// </summary>
-        protected override void InitializeApplicationEventsResolver()
-        {
-            base.InitializeApplicationEventsResolver();
-        }
-
+        
         /// <summary>
         /// Ensure that the OnApplicationStarted methods of the IApplicationEvents are called
         /// </summary>
@@ -285,7 +300,6 @@ namespace Umbraco.Web
             }
         }
 
-
         private void RouteLocalApiController(Type controller, string umbracoPath)
         {
             var meta = PluginController.GetMetadata(controller);
@@ -307,6 +321,7 @@ namespace Umbraco.Web
             }
             route.DataTokens.Add("umbraco", "api"); //ensure the umbraco token is set
         }
+
         private void RouteLocalSurfaceController(Type controller, string umbracoPath)
         {
             var meta = PluginController.GetMetadata(controller);
@@ -473,7 +488,6 @@ namespace Umbraco.Web
                 new DefaultCultureDictionaryFactory());
         }
 
-
         private void OnInstanceOnBuildingEmptyIndexOnStartup(object sender, BuildingEmptyIndexOnStartupEventArgs args)
         {
             //store the indexer that needs rebuilding because it's empty for when the boot process