<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def rooms_info(self, room_id=None, room_name=None):
 """Retrieves the information about the room."""

        if room_id is not None:
            return self.__call_api_get('rooms.info', roomId=room_id)
        elif room_name is not None:
            return self.__call_api_get('rooms.info', roomName=room_name)
        else:
            raise RocketMissingParamException('roomId or roomName required')