88 lines
2.8 KiB
Python
88 lines
2.8 KiB
Python
# Copyright 2013 IBM Corp.
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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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#
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# Copyright (c) 2018 Wind River Systems, Inc.
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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from oslo_versionedobjects import base as object_base
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from oslo_versionedobjects import fields as object_fields
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class FmObject(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 = 'fm_object'
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OBJ_PROJECT_NAMESPACE = 'fm'
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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 __getitem__(self, name):
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return getattr(self, name)
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def __setitem__(self, name, value):
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setattr(self, name, value)
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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.FmObject.
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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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@classmethod
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def from_db_object(cls, db_obj):
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return cls._from_db_object(cls(), db_obj)
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class FmObjectSerializer(object_base.VersionedObjectSerializer):
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# Base class to use for object hydration
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OBJ_BASE_CLASS = FmObject
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