def _clear_stats(self):
        """
        Initializes broker statistics data structures
        """
        for stat in (STAT_BYTES_RECEIVED,
                     STAT_BYTES_SENT,
                     STAT_MSG_RECEIVED,
                     STAT_MSG_SENT,
                     STAT_CLIENTS_MAXIMUM,
                     STAT_CLIENTS_CONNECTED,
                     STAT_CLIENTS_DISCONNECTED,
                     STAT_PUBLISH_RECEIVED,
                     STAT_PUBLISH_SENT):
            self._stats[stat] = 0
Initializes broker statistics data structures