52 lines
1.9 KiB
Python
52 lines
1.9 KiB
Python
# Copyright 2011 OpenStack Foundation.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import fixtures
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from monasca.openstack.common import lockutils
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class LockFixture(fixtures.Fixture):
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"""External locking fixture.
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This fixture is basically an alternative to the synchronized decorator with
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the external flag so that tearDowns and addCleanups will be included in
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the lock context for locking between tests. The fixture is recommended to
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be the first line in a test method, like so::
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def test_method(self):
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self.useFixture(LockFixture)
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...
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or the first line in setUp if all the test methods in the class are
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required to be serialized. Something like::
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class TestCase(testtools.testcase):
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def setUp(self):
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self.useFixture(LockFixture)
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super(TestCase, self).setUp()
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...
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This is because addCleanups are put on a LIFO queue that gets run after the
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test method exits. (either by completing or raising an exception)
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"""
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def __init__(self, name, lock_file_prefix=None):
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self.mgr = lockutils.lock(name, lock_file_prefix, True)
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def setUp(self):
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super(LockFixture, self).setUp()
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self.addCleanup(self.mgr.__exit__, None, None, None)
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self.lock = self.mgr.__enter__()
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