683206d237
This patch follows the rules about import in HACKING.rst https://github.com/openstack/marconi/blob/master/HACKING.rst#imports * reorder imports * Add missing blank lines before code Change-Id: I4abcfb3a2640499c5df34cbf75b5eaecb3d19823
35 lines
1.1 KiB
Python
35 lines
1.1 KiB
Python
# Copyright (c) 2013 Rackspace Hosting, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""round_robin: Implements round-robin selection for partition hosts."""
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import itertools
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class Selector(object):
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def __init__(self):
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self._index = {}
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def next(self, name, hosts):
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"""Round robin selection of hosts
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:param name: text - name to associate this list with
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:param hosts: [a] - list of things to round robin. In the context
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of Marconi, this is a list of URLs.
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"""
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if name not in self._index:
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self._index[name] = itertools.cycle(hosts)
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return next(self._index[name])
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