97 lines
3.5 KiB
Python
97 lines
3.5 KiB
Python
# Copyright 2016 Huawei Technologies Co.,LTD.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Nimble common internal object model"""
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from oslo_utils import versionutils
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from oslo_versionedobjects import base as object_base
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from nimble import objects
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from nimble.objects import fields as object_fields
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class NimbleObjectRegistry(object_base.VersionedObjectRegistry):
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def registration_hook(self, cls, index):
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# NOTE(jroll): blatantly stolen from nova
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# NOTE(danms): This is called when an object is registered,
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# and is responsible for maintaining nimble.objects.$OBJECT
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# as the highest-versioned implementation of a given object.
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version = versionutils.convert_version_to_tuple(cls.VERSION)
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if not hasattr(objects, cls.obj_name()):
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setattr(objects, cls.obj_name(), cls)
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else:
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cur_version = versionutils.convert_version_to_tuple(
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getattr(objects, cls.obj_name()).VERSION)
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if version >= cur_version:
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setattr(objects, cls.obj_name(), cls)
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class NimbleObject(object_base.VersionedObject):
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"""Base class and object factory.
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This forms the base of all objects that can be remoted or instantiated
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via RPC. Simply defining a class that inherits from this base class
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will make it remotely instantiatable. Objects should implement the
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necessary "get" classmethod routines as well as "save" object methods
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as appropriate.
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"""
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OBJ_SERIAL_NAMESPACE = 'nimble_object'
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OBJ_PROJECT_NAMESPACE = 'nimble'
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# TODO(lintan) Refactor these fields and create PersistentObject and
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# TimeStampObject like Nova when it is necessary.
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fields = {
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'created_at': object_fields.DateTimeField(nullable=True),
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'updated_at': object_fields.DateTimeField(nullable=True),
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}
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def as_dict(self):
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return dict((k, getattr(self, k))
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for k in self.fields
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if hasattr(self, k))
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def obj_refresh(self, loaded_object):
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"""Applies updates for objects that inherit from base.NimbleObject.
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Checks for updated attributes in an object. Updates are applied from
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the loaded object column by column in comparison with the current
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object.
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"""
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for field in self.fields:
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if (self.obj_attr_is_set(field) and
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self[field] != loaded_object[field]):
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self[field] = loaded_object[field]
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@staticmethod
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def _from_db_object(obj, db_object):
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"""Converts a database entity to a formal object.
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:param obj: An object of the class.
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:param db_object: A DB model of the object
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:return: The object of the class with the database entity added
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"""
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for field in obj.fields:
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obj[field] = db_object[field]
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obj.obj_reset_changes()
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return obj
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class NimbleObjectSerializer(object_base.VersionedObjectSerializer):
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# Base class to use for object hydration
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OBJ_BASE_CLASS = NimbleObject
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