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OpenStack Study: service.py**** CubicPower OpenStack Study ****
# Copyright 2010 United States Government as represented by the # Administrator of the National Aeronautics and Space Administration. # All Rights Reserved. # Copyright 2011 Red Hat, Inc. # # 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 neutron.openstack.common import log as logging from neutron.openstack.common import rpc from neutron.openstack.common.rpc import dispatcher as rpc_dispatcher from neutron.openstack.common import service LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class Service(service.Service): """Service object for binaries running on hosts. A service enables rpc by listening to queues based on topic and host. """
**** CubicPower OpenStack Study **** def __init__(self, host, topic, manager=None, serializer=None): super(Service, self).__init__() self.host = host self.topic = topic self.serializer = serializer if manager is None: self.manager = self else: self.manager = manager
**** CubicPower OpenStack Study **** def start(self): super(Service, self).start() self.conn = rpc.create_connection(new=True) LOG.debug("Creating Consumer connection for Service %s" % self.topic) dispatcher = rpc_dispatcher.RpcDispatcher([self.manager], self.serializer) # Share this same connection for these Consumers self.conn.create_consumer(self.topic, dispatcher, fanout=False) node_topic = '%s.%s' % (self.topic, self.host) self.conn.create_consumer(node_topic, dispatcher, fanout=False) self.conn.create_consumer(self.topic, dispatcher, fanout=True) # Hook to allow the manager to do other initializations after # the rpc connection is created. if callable(getattr(self.manager, 'initialize_service_hook', None)): self.manager.initialize_service_hook(self) # Consume from all consumers in a thread self.conn.consume_in_thread()
**** CubicPower OpenStack Study **** def stop(self): # Try to shut the connection down, but if we get any sort of # errors, go ahead and ignore them.. as we're shutting down anyway try: self.conn.close() except Exception: pass super(Service, self).stop()
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