def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('config_file')
    parser.add_argument('--debug', action='store_true')
    parser.add_argument('--logfile')
    parser.add_argument('--purge', action='store_true')
    parser.add_argument('--loadgen', action='store_true')
    parser.add_argument('--sessionid')
    parser.add_argument('--httpserver', action='store_true')
    args = parser.parse_args()

    if args.logfile:
        fh = FileHandler(args.logfile)
        formatter = logging.Formatter(FORMAT)
        fh.setFormatter(formatter)
        logger.addHandler(fh)

    if args.debug:
        logger.setLevel(logging.DEBUG)

    config = yaml.load(open(args.config_file))
    sessionmaker = config_to_db_session(config, Base)

    stomp_endpoint = config['stomp_endpoint']
    stomp_login = config['stomp_login']
    stomp_password = config['stomp_password']

    stomp_config = StompConfig(stomp_endpoint, login=stomp_login, passcode=stomp_password)

    if args.purge:
        purge_completed_jobs(sessionmaker())
        return
    elif args.loadgen:
        if not args.sessionid:
            raise ValueError('parameter sessionid is required for load generator')
        jm = StompSync(stomp_config)
        jm.connect()
        generate_load(jm, args.sessionid)
        jm.disconnect()
        return
    elif args.httpserver:
        from jobmanager.www import app
        app.config['DB'] = sessionmaker
        app.config['params'] = config
        app.run()
        return

    jm = JobManager(sessionmaker, config=stomp_config)
    jm.run()

    l = task.LoopingCall(jm.run_periodic_checks)
    l.start(PERIODIC_CHECK_INTERVAL)

    reactor.run()