manager.py 文件源码

def __init__(self, scheduler_driver=None, *args, **kwargs):
        if not scheduler_driver:
            scheduler_driver = CONF.scheduler_driver
        try:
            self.driver = driver.DriverManager(
                    "nova.scheduler.driver",
                    scheduler_driver,
                    invoke_on_load=True).driver
        # TODO(Yingxin): Change to catch stevedore.exceptions.NoMatches after
        # stevedore v1.9.0
        except RuntimeError:
            # NOTE(Yingxin): Loading full class path is deprecated and should
            # be removed in the N release.
            try:
                self.driver = importutils.import_object(scheduler_driver)
                LOG.warning(_LW("DEPRECATED: scheduler_driver uses "
                                "classloader to load %(path)s. This legacy "
                                "loading style will be removed in the "
                                "N release."),
                            {'path': scheduler_driver})
            except (ImportError, ValueError):
                raise RuntimeError(
                        _("Cannot load scheduler driver from configuration "
                          "%(conf)s."),
                        {'conf': scheduler_driver})
        super(SchedulerManager, self).__init__(service_name='scheduler',
                                               *args, **kwargs)