真正的sinatra(ruby/rack)after_filter的最快方法是什么？

class AfterFilterMiddleware
  def initialize(app)
    @app = app
  end

  def call(env)
    status, headers, body = @app.call(env)
    after_filter(env, status, headers, body)
    [status, headers, body]
  end

  def after_filter(env, status, headers, body)
    # 在这里实现after_filter的代码
  end
end

use AfterFilterMiddleware

after do
  # 在这里实现after_filter的代码
end

module AfterFilterExtension
  def after_filter(&block)
    @after_filter = block
  end

  def call(env)
    status, headers, body = @app.call(env)
    @after_filter.call(env, status, headers, body)
    [status, headers, body]
  end
end

Sinatra.register AfterFilterExtension

after_filter do |env, status, headers, body|
  # 在这里实现after_filter的代码
end