Move routes_reloader to a class: RoutesReloader

railties/lib/rails/application.rb

 require 'active_support/core_ext/hash/reverse_merge'
 require 'active_support/file_update_checker'
 require 'fileutils'
+require 'rails/routes_reloader'
 require 'rails/plugin'
 require 'rails/engine'
 
@@ -81,28 +82,7 @@ def eager_load! #:nodoc:
     end
 
     def routes_reloader
-      @routes_reloader ||= ActiveSupport::FileUpdateChecker.new([]){ reload_routes! }
-    end
-
-    def reload_routes!
-      routes_to_reload.each do |_routes, draw_block|
-        _routes = self.routes
-        _routes.disable_clear_and_finalize = true
-        _routes.clear!
-        _routes.draw(&draw_block) if draw_block
-      end
-      routes_reloader.paths.each { |path| load(path) }
-      routes_to_reload.each do |_routes, draw_block|
-        ActiveSupport.on_load(:action_controller) { _routes.finalize! }
-      end
-    ensure
-      routes_to_reload.each do |_routes, draw_block|
-        _routes.disable_clear_and_finalize = false
-      end
-    end
-
-    def routes_to_reload
-      @routes_to_reload ||= {}
+      @routes_reloader ||= Rails::RoutesReloader.new
     end
 
     def initialize!

railties/lib/rails/engine.rb

@@ -449,7 +449,7 @@ def load_seed
     end
 
     initializer :add_routing_paths do |app|
-      app.routes_to_reload[self.routes] = routes_draw_block
+      app.routes_reloader.blocks[routes] = routes_draw_block
       paths.config.routes.to_a.each do |route|
         app.routes_reloader.paths.unshift(route) if File.exists?(route)
       end

railties/lib/rails/routes_reloader.rb

+module Rails
+  class RoutesReloader < ::ActiveSupport::FileUpdateChecker
+    def initialize
+      super([]) { reload! }
+    end
+
+    def blocks
+      @blocks ||= {}
+    end
+  private
+    def reload!
+      clear!
+      load_blocks
+      load_paths
+      finalize!
+    ensure
+      revert
+    end
+
+    def clear!
+      routers.each do |routes|
+        routes.disable_clear_and_finalize = true
+        routes.clear!
+      end
+    end
+
+    def load_blocks
+      blocks.each do |routes, block|
+        routes.draw(&block) if block
+      end
+    end
+
+    def load_paths
+        paths.each { |path| load(path) }
+    end
+
+    def finalize!
+      routers.each do |routes|
+        ActiveSupport.on_load(:action_controller) { routes.finalize! }
+      end
+    end
+
+    def revert
+      routers.each do |routes|
+        routes.disable_clear_and_finalize = false
+      end
+    end
+
+    def routers
+      blocks.keys
+    end
+  end
+end
+