From c74b22c304998e3f077058c79a1294bc030503de Mon Sep 17 00:00:00 2001
From: selango <sakthivel.elango@linkedin.com>
Date: Thu, 13 Feb 2020 11:44:42 +0530
Subject: [PATCH] Resolve #7874 - stop too many fetch calls to
 docmanager-extension on first load

---
 packages/docmanager-extension/src/index.ts | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/packages/docmanager-extension/src/index.ts b/packages/docmanager-extension/src/index.ts
index 45cfbe76d48b..7e38d074994b 100644
--- a/packages/docmanager-extension/src/index.ts
+++ b/packages/docmanager-extension/src/index.ts
@@ -241,9 +241,23 @@ ${fileTypes}`;
         return { ...plugin, schema };
       }
     });
+
+    //callback to registry change that ensures not to invoke reload method when there is already a promise that is pending
+    let reloadSettingsRegistry = () => {
+      let promisePending = false;
+
+      return async () => {
+          if(!promisePending) {
+            promisePending = true;
+            await settingRegistry.reload(pluginId);
+            promisePending = false;
+          }
+      };
+    };
+
     // If the document registry gains or loses a factory or file type,
     // regenerate the settings description with the available options.
-    registry.changed.connect(() => settingRegistry.reload(pluginId));
+    registry.changed.connect(reloadSettingsRegistry());
 
     return docManager;
   }