'constructor'

def __init__(self, fetcher, parser, saver, url_filter=None, monitor_sleep_time=5):

    ThreadPool.__init__(self, fetcher, parser, saver, url_filter=url_filter, monitor_sleep_time=monitor_sleep_time)
    self._redis_client = None
    self._key_wait = None
    self._key_all = None
    self.update_number_dict(TPEnum.URL_NOT_FETCH, (-1))
    return
