class ActionController::Caching::Sweeper

def action_path_for(options)
  Actions::ActionCachePath.new(controller, options).path
end

def after(controller)
  self.controller = controller
  callback(:after) if controller.perform_caching
  # Clean up, so that the controller can be collected after this request
  self.controller = nil
end

def assigns(key)
  controller.instance_variable_get("@#{key}")
end

def before(controller)
  self.controller = controller
  callback(:before) if controller.perform_caching
  true # before method from sweeper should always return true
end

def callback(timing)
  controller_callback_method_name = "#{timing}_#{controller.controller_name.underscore}"
  action_callback_method_name     = "#{controller_callback_method_name}_#{controller.action_name}"
  __send__(controller_callback_method_name) if respond_to?(controller_callback_method_name, true)
  __send__(action_callback_method_name)     if respond_to?(action_callback_method_name, true)
end

def method_missing(method, *arguments, &block)
  return unless @controller
  @controller.__send__(method, *arguments, &block)
end