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# 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.
from oslo_service import service
from neutron.callbacks import events
from neutron.callbacks import registry
from neutron.callbacks import resources
class NeutronWorker(service.ServiceBase):
"""Partial implementation of the ServiceBase ABC
Subclasses will still need to add the other abstract methods defined in
service.ServiceBase. See oslo_service for more details.
If a plugin needs to handle synchronization with the Neutron database and
do this only once instead of in every API worker, for instance, it would
define a NeutronWorker class and the plugin would have get_workers return
an array of NeutronWorker instances. For example:
class MyPlugin(...):
def get_workers(self):
return [MyPluginWorker()]
class MyPluginWorker(NeutronWorker):
def start(self):
super(MyPluginWorker, self).start()
do_sync()
"""
def start(self):
registry.notify(resources.PROCESS, events.AFTER_CREATE, self.start)
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