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OpenStack Study: event.py**** CubicPower OpenStack Study ****
# Copyright 2013 Red Hat, Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. """ Asynchronous event notifications from virtualization drivers. This module defines a set of classes representing data for various asynchronous events that can occur in a virtualization driver. """ import time EVENT_LIFECYCLE_STARTED = 0 EVENT_LIFECYCLE_STOPPED = 1 EVENT_LIFECYCLE_PAUSED = 2 EVENT_LIFECYCLE_RESUMED = 3
**** CubicPower OpenStack Study **** class Event(object): """Base class for all events emitted by a hypervisor. All events emitted by a virtualization driver are subclasses of this base object. The only generic information recorded in the base class is a timestamp indicating when the event first occurred. The timestamp is recorded as fractional seconds since the UNIX epoch. """
**** CubicPower OpenStack Study **** def __init__(self, timestamp=None): if timestamp is None: self.timestamp = time.time() else: self.timestamp = timestamp
**** CubicPower OpenStack Study **** def get_timestamp(self): return self.timestamp
**** CubicPower OpenStack Study **** class InstanceEvent(Event): """Base class for all instance events. All events emitted by a virtualization driver which are associated with a virtual domain instance are subclasses of this base object. This object records the UUID associated with the instance. """
**** CubicPower OpenStack Study **** def __init__(self, uuid, timestamp=None): super(InstanceEvent, self).__init__(timestamp) self.uuid = uuid
**** CubicPower OpenStack Study **** def get_instance_uuid(self): return self.uuid
**** CubicPower OpenStack Study **** class LifecycleEvent(InstanceEvent): """Class for instance lifecycle state change events. When a virtual domain instance lifecycle state changes, events of this class are emitted. The EVENT_LIFECYCLE_XX constants
**** CubicPower OpenStack Study **** def __init__(self, uuid, transition, timestamp=None): super(LifecycleEvent, self).__init__(uuid, timestamp) self.transition = transition
**** CubicPower OpenStack Study **** def get_transition(self): return self.transition
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