Extract fail_unimplemented_klass!

ee/app/services/geo/base_file_service.rb

@@ -24,6 +24,14 @@ module Geo
 
     private
 
+    def fail_unimplemented_klass!(type:)
+      error_message = "Cannot find a handler for Gitlab::Geo #{type} for object_type = '#{object_type}'"
+
+      log_error(error_message)
+
+      raise NotImplementedError, error_message
+    end
+
     def user_upload?
       Gitlab::Geo::Replication.object_type_from_user_uploads?(object_type)
     end

ee/app/services/geo/file_download_service.rb

@@ -37,10 +37,7 @@ module Geo
       return Gitlab::Geo::Replication::JobArtifactDownloader if job_artifact?
       return Gitlab::Geo::Replication::LfsDownloader if lfs?
 
-      error_message = "Cannot find a Gitlab::Geo Downloader for object_type = '#{object_type}'"
-
-      log_error(error_message)
-      raise NotImplementedError, error_message
+      fail_unimplemented_klass!(type: 'Downloader')
     end
 
     def log_file_download(mark_as_synced, download_result, start_time)

ee/app/services/geo/file_upload_service.rb

@@ -41,10 +41,7 @@ module Geo
       return Gitlab::Geo::Replication::JobArtifactRetriever if job_artifact?
       return Gitlab::Geo::Replication::LfsRetriever if lfs?
 
-      error_message = "Cannot find a Gitlab::Geo Uploader for object_type = '#{object_type}'"
-
-      log_error(error_message)
-      raise NotImplementedError, error_message
+      fail_unimplemented_klass!(type: 'Retriever')
     end
   end
 end

ee/lib/gitlab/geo/replication/base_retriever.rb

@@ -5,6 +5,7 @@ module Gitlab
     module Replication
       class BaseRetriever
         include LogHelpers
+        include Gitlab::Utils::StrongMemoize
 
         attr_reader :object_db_id, :message