Jonathan/appeals 24987

app/models/end_product_establishment.rb

@@ -211,27 +211,31 @@ def cancel_unused_end_product!
   end
 
   def sync!
-    # There is no need to sync end_product_status if the status
-    # is already inactive since an EP can never leave that state
-    return true unless status_active?
-
-    fail EstablishedEndProductNotFound, id unless result
-
-    # load contentions now, in case "source" needs them.
-    # this VBMS call is slow and will cause the transaction below
-    # to timeout in some cases.
-    contentions unless result.status_type_code == EndProduct::STATUSES.key("Canceled")
+    RedisMutex.with_lock("EndProductEstablishment:#{id}", block: 60, expire: 100) do    # key => "EndProductEstablishment:id"
+      # There is no need to sync end_product_status if the status
+      # is already inactive since an EP can never leave that state
+      return true unless status_active?
+
+      fail EstablishedEndProductNotFound, id unless result
+
+      # load contentions now, in case "source" needs them.
+      # this VBMS call is slow and will cause the transaction below
+      # to timeout in some cases.
+      contentions unless result.status_type_code == EndProduct::STATUSES.key("Canceled")
+
+      transaction do
+        update!(
+          synced_status: result.status_type_code,
+          last_synced_at: Time.zone.now
+        )
+        status_cancelled? ? handle_cancelled_ep! : sync_source!
+        close_request_issues_with_no_decision!
+      end
 
-    transaction do
-      update!(
-        synced_status: result.status_type_code,
-        last_synced_at: Time.zone.now
-      )
-      status_cancelled? ? handle_cancelled_ep! : sync_source!
-      close_request_issues_with_no_decision!
+      save_updated_end_product_code!
     end
-
-    save_updated_end_product_code!
+  rescue RedisMutex::LockError
+    Rails.logger.error('failed to acquire lock! EPE sync is being called by another process. Please try again later.')
   rescue EstablishedEndProductNotFound, AppealRepository::AppealNotValidToReopen => error
     raise error
   rescue StandardError => error