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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 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.
import datetime
from eventlet import greenthread
import mox
from openstack.common import loopingcall
from openstack.common import timeutils
from tests import utils
class LoopingCallTestCase(utils.BaseTestCase):
def setUp(self):
super(LoopingCallTestCase, self).setUp()
self.num_runs = 0
def test_return_true(self):
def _raise_it():
raise loopingcall.LoopingCallDone(True)
timer = loopingcall.FixedIntervalLoopingCall(_raise_it)
self.assertTrue(timer.start(interval=0.5).wait())
def test_return_false(self):
def _raise_it():
raise loopingcall.LoopingCallDone(False)
timer = loopingcall.FixedIntervalLoopingCall(_raise_it)
self.assertFalse(timer.start(interval=0.5).wait())
def _wait_for_zero(self):
"""Called at an interval until num_runs == 0."""
if self.num_runs == 0:
raise loopingcall.LoopingCallDone(False)
else:
self.num_runs = self.num_runs - 1
def test_repeat(self):
self.num_runs = 2
timer = loopingcall.FixedIntervalLoopingCall(self._wait_for_zero)
self.assertFalse(timer.start(interval=0.5).wait())
def test_interval_adjustment(self):
"""Ensure the interval is adjusted to account for task duration."""
self.num_runs = 3
now = datetime.datetime.utcnow()
second = datetime.timedelta(seconds=1)
smidgen = datetime.timedelta(microseconds=10000)
timeoverrides = [now, now + second - smidgen,
now, now + second + second,
now, now + second + smidgen]
m = mox.Mox()
m.StubOutWithMock(greenthread, 'sleep')
greenthread.sleep(mox.IsAlmost(0.02))
greenthread.sleep(mox.IsAlmost(0.0))
greenthread.sleep(mox.IsAlmost(0.0))
m.ReplayAll()
try:
timeutils.set_time_override(timeoverrides)
timer = loopingcall.FixedIntervalLoopingCall(self._wait_for_zero)
timer.start(interval=1.01).wait()
finally:
timeutils.clear_time_override()
m.UnsetStubs()
m.VerifyAll()
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