@classmethod
def add_region(cls, name, expires, redis_expiration=60 * 60 * 24 * 7):
    """Add a cache region to the current configuration

        :param name: The name of the cache region
        :type name: string
        :param expires: The expiration in seconds.
        :type expires: integer
        :param redis_expiration: How long the Redis key expiration is
                                 set for. Defaults to 1 week.
        :type redis_expiration: integer

        """
    cls.regions[name] = dict(expires=expires, redis_expiration=redis_expiration
        )
