Extract routes reloading responsibilities from application and load them just upon a request.

1 files changed, 46 insertions, 0 deletions

diff --git a/railties/lib/rails/application/routes_reloader.rb b/railties/lib/rails/application/routes_reloader.rb
new file mode 100644
index 0000000000..621bb1ccbd
--- /dev/null
+++ b/railties/lib/rails/application/routes_reloader.rb
@@ -0,0 +1,46 @@
+module Rails
+  class Application
+    class RoutesReloader
+      attr_reader :config
+
+      def initialize(config)
+        @config, @last_change_at = config, nil
+      end
+
+      def changed_at
+        routes_changed_at = nil
+
+        config.action_dispatch.route_files.each do |config|
+          config_changed_at = File.stat(config).mtime
+
+          if routes_changed_at.nil? || config_changed_at > routes_changed_at
+            routes_changed_at = config_changed_at
+          end
+        end
+
+        routes_changed_at
+      end
+
+      def reload!
+        routes = Rails::Application.routes
+        routes.disable_clear_and_finalize = true
+
+        routes.clear!
+        config.action_dispatch.route_files.each { |config| load(config) }
+        routes.finalize!
+
+        nil
+      ensure
+        routes.disable_clear_and_finalize = false
+      end
+
+      def reload_if_changed
+        current_change_at = changed_at
+        if @last_change_at != current_change_at
+          @last_change_at = current_change_at
+          reload!
+        end
+      end
+    end
+  end
+end
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