OpenStack Study: chance.py

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# Copyright (C) 2013 Hewlett-Packard Development Company, L.P.

#

# 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 Weigher. Assign random weights to hosts.

Used to spread volumes randomly across a list of equally suitable hosts.

"""

import random

from cinder.openstack.common.scheduler import weights

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class ChanceWeigher(weights.BaseHostWeigher):

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    def _weigh_object(self, host_state, weight_properties):

        return random.random()