08a60f7483
With python 3.x, classes can use the metaclass= logic to not require usage of the six library. One step in removing all of six usage from neutron. Change-Id: I2f815e412d9a96eb5faf2b3bb3a1e393a9db9309
42 lines
1.8 KiB
Python
42 lines
1.8 KiB
Python
# Copyright (c) 2015 OpenStack Foundation.
|
|
# All Rights Reserved.
|
|
#
|
|
# 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.
|
|
|
|
import abc
|
|
|
|
from neutron_lib.db import api as db_api
|
|
|
|
|
|
class BaseResourceFilter(object, metaclass=abc.ABCMeta):
|
|
"""Encapsulate logic that is specific to the resource type."""
|
|
@abc.abstractmethod
|
|
def filter_agents(self, plugin, context, resource):
|
|
"""Return the agents that can host the resource."""
|
|
|
|
def bind(self, context, agents, resource_id, force_scheduling=False):
|
|
"""Bind the resource to the agents."""
|
|
with db_api.CONTEXT_WRITER.using(context):
|
|
for agent in agents:
|
|
# Load is being incremented here to reflect latest agent load
|
|
# even within the agent report interval. This will be very
|
|
# much necessary when bulk resource creation happens within a
|
|
# agent report interval time.
|
|
# NOTE: The resource being bound might or might not be of the
|
|
# same type which is accounted for the load. It isn't a
|
|
# problem because "+ 1" here does not meant to predict
|
|
# precisely what the load of the agent will be. The value will
|
|
# be corrected by the agent on the next report interval.
|
|
agent.load += 1
|
|
agent.update()
|