OpenStack Networking (Neutron)
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neutron/neutron/tests/unit/notifiers/test_batch_notifier.py

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# Copyright (c) 2014 OpenStack Foundation.
# 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.
import eventlet
import mock
from neutron.common import utils
from neutron.notifiers import batch_notifier
from neutron.tests import base
class TestBatchNotifier(base.BaseTestCase):
def setUp(self):
super(TestBatchNotifier, self).setUp()
self._received_events = eventlet.Queue()
self.notifier = batch_notifier.BatchNotifier(2, self._queue_events)
self.spawn_n_p = mock.patch.object(eventlet, 'spawn_n')
def _queue_events(self, events):
for event in events:
self._received_events.put(event)
def test_queue_event_no_event(self):
spawn_n = self.spawn_n_p.start()
self.notifier.queue_event(None)
self.assertEqual(0, len(self.notifier._pending_events.queue))
self.assertEqual(0, spawn_n.call_count)
def test_queue_event_first_event(self):
spawn_n = self.spawn_n_p.start()
self.notifier.queue_event(mock.Mock())
self.assertEqual(1, len(self.notifier._pending_events.queue))
self.assertEqual(1, spawn_n.call_count)
def test_queue_event_multiple_events_notify_method(self):
def _batch_notifier_dequeue():
while not self.notifier._pending_events.empty():
self.notifier._pending_events.get()
c_mock = mock.patch.object(self.notifier, '_notify',
side_effect=_batch_notifier_dequeue).start()
events = 20
for i in range(events):
self.notifier.queue_event('Event %s' % i)
eventlet.sleep(0) # yield to let coro execute
utils.wait_until_true(self.notifier._pending_events.empty,
timeout=5)
# Called twice: when the first thread calls "synced_send" and then,
# in the same loop, when self._pending_events is not empty(). All
# self.notifier.queue_event calls are done in just one
# "batch_interval" (2 secs).
self.assertEqual(2, c_mock.call_count)
def test_queue_event_multiple_events_callback_method(self):
events = 20
for i in range(events):
self.notifier.queue_event('Event %s' % i)
eventlet.sleep(0) # yield to let coro execute
utils.wait_until_true(self.notifier._pending_events.empty,
timeout=5)
expected = ['Event %s' % i for i in range(events)]
# Check the events have been handled in the same input order.
self.assertEqual(expected, list(self._received_events.queue))