# File lib/yapra/legacy_plugin/advance_mode_registry.rb, line 32
    def get module_name
      plugin = legacy_plugins[module_name]
      unless plugin
        plugin_paths.each do |folder|
          file = File.join(folder, (module_name.gsub('::', '/') + '.rb'))
          if File.file?(file)
            plugin = Yapra::LegacyPlugin::Base.new(pipeline, file)
            legacy_plugins[ module_name ] = plugin
            logger.debug "#{module_name} is loaded from #{file}"
            break
          end
        end
      end
      raise "#{module_name} is not registered." unless plugin
      plugin
    end