def connect(self): 
        try:
            self.connection = pymongo.Connection(self.host, self.port)
            self.db = self.connection[self.name]
        except AutoReconnect:
            raise DatabaseException("It's not possible connect to the database")
def __init__(self, duration_secs):
    self._start_time_secs = time.time()
    self._duration_secs = duration_secs