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# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
#
# 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.
from synapse.util import async, logcontext
from tests import unittest
from twisted.internet import defer
from synapse.util.async import Linearizer
class LinearizerTestCase(unittest.TestCase):
@defer.inlineCallbacks
def test_linearizer(self):
linearizer = Linearizer()
key = object()
d1 = linearizer.queue(key)
cm1 = yield d1
d2 = linearizer.queue(key)
self.assertFalse(d2.called)
with cm1:
self.assertFalse(d2.called)
with (yield d2):
pass
def test_lots_of_queued_things(self):
# we have one slow thing, and lots of fast things queued up behind it.
# it should *not* explode the stack.
linearizer = Linearizer()
@defer.inlineCallbacks
def func(i, sleep=False):
with logcontext.LoggingContext("func(%s)" % i) as lc:
with (yield linearizer.queue("")):
self.assertEqual(
logcontext.LoggingContext.current_context(), lc)
if sleep:
yield async.sleep(0)
self.assertEqual(
logcontext.LoggingContext.current_context(), lc)
func(0, sleep=True)
for i in xrange(1, 100):
func(i)
return func(1000)
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