142 lines
5.0 KiB
Python
142 lines
5.0 KiB
Python
# Copyright 2013-2016 DataStax, 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 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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try:
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import unittest2 as unittest
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except ImportError:
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import unittest # noqa
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import time
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class TimerCallback(object):
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invoked = False
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created_time = 0
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invoked_time = 0
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expected_wait = 0
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def __init__(self, expected_wait):
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self.invoked = False
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self.created_time = time.time()
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self.expected_wait = expected_wait
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def invoke(self):
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self.invoked_time = time.time()
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self.invoked = True
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def was_invoked(self):
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return self.invoked
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def get_wait_time(self):
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elapsed_time = self.invoked_time - self.created_time
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return elapsed_time
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def wait_match_excepted(self):
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if self.expected_wait - .01 <= self.get_wait_time() <= self.expected_wait + .01:
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return True
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return False
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def get_timeout(gross_time, start, end, precision, split_range):
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"""
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A way to generate varying timeouts based on ranges
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:param gross_time: Some integer between start and end
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:param start: the start value of the range
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:param end: the end value of the range
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:param precision: the precision to use to generate the timeout.
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:param split_range: generate values from both ends
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:return: a timeout value to use
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"""
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if split_range:
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top_num = float(end) / precision
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bottom_num = float(start) / precision
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if gross_time % 2 == 0:
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timeout = top_num - float(gross_time) / precision
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else:
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timeout = bottom_num + float(gross_time) / precision
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else:
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timeout = float(gross_time) / precision
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return timeout
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def submit_and_wait_for_completion(unit_test, connection, start, end, increment, precision, split_range=False):
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"""
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This will submit a number of timers to the provided connection. It will then ensure that the corresponding
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callback is invoked in the appropriate amount of time.
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:param unit_test: Invoking unit tests
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:param connection: Connection to create the timer on.
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:param start: Lower bound of range.
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:param end: Upper bound of the time range
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:param increment: +1, or -1
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:param precision: 100 for centisecond, 1000 for milliseconds
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:param split_range: True to split the range between incrementing and decrementing.
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"""
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# Various lists for tracking callback as completed or pending
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pending_callbacks = []
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completed_callbacks = []
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# submit timers with various timeouts
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for gross_time in range(start, end, increment):
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timeout = get_timeout(gross_time, start, end, precision, split_range)
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callback = TimerCallback(timeout)
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connection.create_timer(timeout, callback.invoke)
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pending_callbacks.append(callback)
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# wait for all the callbacks associated with the timers to be invoked
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while len(pending_callbacks) is not 0:
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for callback in pending_callbacks:
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if callback.was_invoked():
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pending_callbacks.remove(callback)
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completed_callbacks.append(callback)
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time.sleep(.1)
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# ensure they are all called back in a timely fashion
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for callback in completed_callbacks:
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unit_test.assertAlmostEqual(callback.expected_wait, callback.get_wait_time(), delta=.15)
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class TimerConnectionTests(object):
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def test_multi_timer_validation(self):
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"""
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Verify that timer timeouts are honored appropriately
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"""
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# Tests timers submitted in order at various timeouts
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submit_and_wait_for_completion(self, self.connection_class, 0, 100, 1, 100)
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# Tests timers submitted in reverse order at various timeouts
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submit_and_wait_for_completion(self, self.connection_class, 100, 0, -1, 100)
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# Tests timers submitted in varying order at various timeouts
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submit_and_wait_for_completion(self, self.connection_class, 0, 100, 1, 100, True),
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def test_timer_cancellation(self):
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"""
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Verify that timer cancellation is honored
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"""
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# Various lists for tracking callback stage
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timeout = .1
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callback = TimerCallback(timeout)
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timer = self.connection_class.create_timer(timeout, callback.invoke)
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timer.cancel()
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# Release context allow for timer thread to run.
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time.sleep(.2)
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timer_manager = self.connection_class._timers
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# Assert that the cancellation was honored
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self.assertFalse(timer_manager._queue)
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self.assertFalse(timer_manager._new_timers)
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self.assertFalse(callback.was_invoked())
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