46 lines
2.0 KiB
Python
46 lines
2.0 KiB
Python
# Copyright (c) 2015 OpenStack Foundation.
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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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import abc
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from neutron_lib.db import api as db_api
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from oslo_db import exception as db_exc
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from neutron.common import utils as n_utils
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class BaseResourceFilter(object, metaclass=abc.ABCMeta):
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"""Encapsulate logic that is specific to the resource type."""
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@abc.abstractmethod
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def filter_agents(self, plugin, context, resource):
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"""Return the agents that can host the resource."""
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@n_utils.skip_exceptions(db_exc.DBError)
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def bind(self, context, agents, resource_id, force_scheduling=False):
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"""Bind the resource to the agents."""
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with db_api.CONTEXT_WRITER.using(context):
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for agent in agents:
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# Load is being incremented here to reflect latest agent load
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# even within the agent report interval. This will be very
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# much necessary when bulk resource creation happens within a
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# agent report interval time.
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# NOTE: The resource being bound might or might not be of the
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# same type which is accounted for the load. It isn't a
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# problem because "+ 1" here does not meant to predict
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# precisely what the load of the agent will be. The value will
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# be corrected by the agent on the next report interval.
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agent.load += 1
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agent.update()
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