# vim: tabstop=4 shiftwidth=4 softtabstop=4 # Copyright (c) 2010 Openstack, LLC. # Copyright 2010 United States Government as represented by the # Administrator of the National Aeronautics and Space Administration. # 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. """ Chance (Random) Scheduler implementation """ import random from nova.scheduler import driver class ChanceScheduler(driver.Scheduler): """Implements Scheduler as a random node selector.""" def schedule(self, context, topic, *_args, **_kwargs): """Picks a host that is up at random.""" hosts = self.hosts_up(context, topic) if not hosts: raise driver.NoValidHost(_("No hosts found")) return hosts[int(random.random() * len(hosts))]