diff options
| -rw-r--r-- | nova/quota.py | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/nova/quota.py b/nova/quota.py index 2bd36b2a6..d8353bbc2 100644 --- a/nova/quota.py +++ b/nova/quota.py @@ -789,15 +789,20 @@ class QuotaEngine(object): def __init__(self, quota_driver_class=None): """Initialize a Quota object.""" - - if not quota_driver_class: - quota_driver_class = CONF.quota_driver - - if isinstance(quota_driver_class, basestring): - quota_driver_class = importutils.import_object(quota_driver_class) - self._resources = {} - self._driver = quota_driver_class + self._driver_cls = quota_driver_class + self.__driver = None + + @property + def _driver(self): + if self.__driver: + return self.__driver + if not self._driver_cls: + self._driver_cls = CONF.quota_driver + if isinstance(self._driver_cls, basestring): + self._driver_cls = importutils.import_object(self._driver_cls) + self.__driver = self._driver_cls + return self.__driver def __contains__(self, resource): return resource in self._resources |