keep an applied invalidation from inducing a write that publishes back

MediaBrowser.Common/Configuration/ConfigurationInvalidationBusExtensions.cs

@@ -0,0 +1,30 @@
+namespace MediaBrowser.Common.Configuration
+{
+    /// <summary>
+    /// Extensions for <see cref="IConfigurationInvalidationBus"/>.
+    /// </summary>
+    public static class ConfigurationInvalidationBusExtensions
+    {
+        /// <summary>
+        /// Announces a write this instance originated, and stays silent for a write induced by an
+        /// invalidation another instance published.
+        /// </summary>
+        /// <remarks>
+        /// This is the backstop for the write path: a consumer reacting to an applied invalidation by
+        /// writing - including a plugin that knows nothing about the bus - cannot turn that write into a
+        /// notice of its own.
+        /// </remarks>
+        /// <param name="bus">The bus.</param>
+        /// <param name="scope">The cache that was written.</param>
+        /// <param name="target">The configuration key or library path that was written, if any.</param>
+        public static void PublishLocalWrite(this IConfigurationInvalidationBus bus, ConfigurationInvalidationScope scope, string? target)
+        {
+            if (ConfigurationInvalidationContext.IsApplyingRemoteInvalidation)
+            {
+                return;
+            }
+
+            bus.Publish(scope, target);
+        }
+    }
+}