Ensures entire nucache linked list is not rebuild on schema changes when disabled

src/Umbraco.Core/Models/PublishedContent/ILivePublishedModelFactory.cs

@@ -9,6 +9,11 @@
         /// Tells the factory that it should build a new generation of models
         /// </summary>
         void Reset();
+
+        /// <summary>
+        /// If the live model factory 
+        /// </summary>
+        bool Enabled { get; }
     }
 
     /// <summary>

src/Umbraco.Core/PublishedModelFactoryExtensions.cs

@@ -17,6 +17,20 @@ namespace Umbraco.Core
         /// <returns></returns>
         public static bool IsLiveFactory(this IPublishedModelFactory factory) => factory is ILivePublishedModelFactory;
 
+        /// <summary>
+        /// Returns true if the current <see cref="IPublishedModelFactory"/> is an implementation of <see cref="ILivePublishedModelFactory2"/> and is enabled
+        /// </summary>
+        /// <param name="factory"></param>
+        /// <returns></returns>
+        public static bool IsLiveFactoryEnabled(this IPublishedModelFactory factory)
+        {
+            if (factory is ILivePublishedModelFactory2 liveFactory2)
+                return liveFactory2.Enabled;
+
+            // if it's not ILivePublishedModelFactory2 we can't determine if it's enabled or not so return true
+            return factory is ILivePublishedModelFactory;
+        }
+
         [Obsolete("This method is no longer used or necessary and will be removed from future")]
         [EditorBrowsable(EditorBrowsableState.Never)]
         public static void WithSafeLiveFactory(this IPublishedModelFactory factory, Action action)
@@ -61,7 +75,6 @@ namespace Umbraco.Core
                         if (resetMethod != null)
                             resetMethod.Invoke(liveFactory, null);
                     }
-
                     action();
                 }
             }

src/Umbraco.ModelsBuilder.Embedded/PureLiveModelFactory.cs

@@ -134,6 +134,9 @@ namespace Umbraco.ModelsBuilder.Embedded
             return ctor();
         }
 
+        /// <inheritdoc />
+        public bool Enabled => _config.Enable;
+
         /// <inheritdoc />
         public void Reset()
         {

src/Umbraco.Web/PublishedCache/NuCache/PublishedSnapshotService.cs

@@ -859,9 +859,7 @@ namespace Umbraco.Web.PublishedCache.NuCache
             Notify<IContentType>(_contentStore, payloads, RefreshContentTypesLocked);
             Notify<IMediaType>(_mediaStore, payloads, RefreshMediaTypesLocked);
 
-            OnNotified(new NotifiedEventArgs<ContentTypeCacheRefresher.JsonPayload>(payloads));
-
-            if (_publishedModelFactory.IsLiveFactory())
+            if (_publishedModelFactory.IsLiveFactoryEnabled())
             {
                 //In the case of Pure Live - we actually need to refresh all of the content and the media
                 //see https://github.com/umbraco/Umbraco-CMS/issues/5671

src/Umbraco.Web/PublishedCache/PublishedSnapshotServiceBase.cs

@@ -49,8 +49,5 @@ namespace Umbraco.Web.PublishedCache
 
         public virtual void Dispose()
         { }
-
-        protected void OnNotified(NotifiedEventArgs<ContentTypeCacheRefresher.JsonPayload> args) => Notified?.Invoke(this, args);
-        public event EventHandler<NotifiedEventArgs<ContentTypeCacheRefresher.JsonPayload>> Notified;
     }
 }