How to use the tempora.schedule.CallbackScheduler function in tempora

def _expired(self, last, now):
        return now - last > self.warn_every

    def warn(self, nick, connection):
        if pmxbot.config.get('privacy warning') == 'suppress':
            return
        if not self.needs_warning(nick):
            return
        logged_channels_string = ', '.join(pmxbot.config.log_channels)
        msg = self.warn_message.format(**locals())
        for line in msg.splitlines():
            connection.notice(nick, line)


class Scheduler(tempora.schedule.CallbackScheduler, irc.schedule.DefaultScheduler):
    pass


class LoggingCommandBot(core.Bot, irc.bot.SingleServerIRCBot):
    def __init__(self, server, port, nickname, channels, password=None):
        ErrorReportingBuffer.install()
        server_list = [(server, port, password)]
        super().__init__(server_list, nickname, nickname)
        self.reactor.scheduler = Scheduler(dispatch=self.handle_scheduled)
        self.nickname = nickname
        self._channels = channels
        self._nickname = nickname
        self.warn_history = WarnHistory()

    def connect(self, *args, **kwargs):
        factory = irc.connection.Factory(wrapper=self._get_wrapper())

def __init__(self, server, port, nickname, channels, password=None):
        token = pmxbot.config['slack token']
        sc = importlib.import_module('slackclient')
        self.slack = sc.SlackClient(token)
        sr = importlib.import_module('slacker')
        self.slacker = sr.Slacker(token)

        self.scheduler = schedule.CallbackScheduler(self.handle_scheduled)