diff options
Diffstat (limited to 'nova/manager.py')
| -rw-r--r-- | nova/manager.py | 34 |
1 files changed, 22 insertions, 12 deletions
diff --git a/nova/manager.py b/nova/manager.py index 804a50479..34338ac04 100644 --- a/nova/manager.py +++ b/nova/manager.py @@ -16,7 +16,8 @@ # License for the specific language governing permissions and limitations # under the License. -""" +"""Base Manager class. + Managers are responsible for a certain aspect of the sytem. It is a logical grouping of code relating to a portion of the system. In general other components should be using the manager to make changes to the components that @@ -49,16 +50,19 @@ Managers will often provide methods for initial setup of a host or periodic tasksto a wrapping service. This module provides Manager, a base class for managers. + """ -from nova import utils from nova import flags from nova import log as logging +from nova import utils from nova.db import base from nova.scheduler import api + FLAGS = flags.FLAGS + LOG = logging.getLogger('nova.manager') @@ -70,23 +74,29 @@ class Manager(base.Base): super(Manager, self).__init__(db_driver) def periodic_tasks(self, context=None): - """Tasks to be run at a periodic interval""" + """Tasks to be run at a periodic interval.""" pass def init_host(self): - """Do any initialization that needs to be run if this is a standalone - service. Child classes should override this method.""" + """Handle initialization if this is a standalone service. + + Child classes should override this method. + + """ pass class SchedulerDependentManager(Manager): """Periodically send capability updates to the Scheduler services. - Services that need to update the Scheduler of their capabilities - should derive from this class. Otherwise they can derive from - manager.Manager directly. Updates are only sent after - update_service_capabilities is called with non-None values.""" - def __init__(self, host=None, db_driver=None, service_name="undefined"): + Services that need to update the Scheduler of their capabilities + should derive from this class. Otherwise they can derive from + manager.Manager directly. Updates are only sent after + update_service_capabilities is called with non-None values. + + """ + + def __init__(self, host=None, db_driver=None, service_name='undefined'): self.last_capabilities = None self.service_name = service_name super(SchedulerDependentManager, self).__init__(host, db_driver) @@ -96,9 +106,9 @@ class SchedulerDependentManager(Manager): self.last_capabilities = capabilities def periodic_tasks(self, context=None): - """Pass data back to the scheduler at a periodic interval""" + """Pass data back to the scheduler at a periodic interval.""" if self.last_capabilities: - LOG.debug(_("Notifying Schedulers of capabilities ...")) + LOG.debug(_('Notifying Schedulers of capabilities ...')) api.update_service_capabilities(context, self.service_name, self.host, self.last_capabilities) |