Python 中使用类修饰器修饰类方法如何处理 self？

class PostCache:
    def __init__(self, func):
        self.func = func
        self.redis = redis.StrictRedis()

    def __call__(self, url_list):
        url_not_cached = []
        for url in url_list:
            if self.redis.get(url):
                self.redis.expire(url, 600)
            else:
                url_not_cached.append(url)
                self.redis.set(url, '1')
                self.redis.expire(url, 600)

        return self.func(url_not_cached)

@rediscache.PostCache
    def __get_content_list(self, url_list):
        content_list = []

        for url in url_list:
            content_list.append(self.get_content(url))

            time.sleep(config_intervaltime())

        return content_list

File "crawler.py", line 28, in get_posts
    post_content_list = self.__get_content_list(url_list)
TypeError: __call__() missing 1 required positional argument: 'url_list'