OpenStack Networking (Neutron)
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neutron/neutron/scheduler/base_resource_filter.py

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# 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
from oslo_db import exception as db_exc
import six
from neutron.common import utils as n_utils
@six.add_metaclass(abc.ABCMeta)
class BaseResourceFilter(object):
"""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."""
@n_utils.skip_exceptions(db_exc.DBError)
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()