116 lines
2.8 KiB
Python
Executable File
116 lines
2.8 KiB
Python
Executable File
# -*- coding: utf-8 -*-
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"""
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test_threaded_cache_property.py
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----------------------------------
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Tests for `cached-property` module, threaded_cache_property.
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"""
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from time import sleep
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from threading import Thread, Lock
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import unittest
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from cached_property import threaded_cached_property
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class TestCachedProperty(unittest.TestCase):
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def test_cached_property(self):
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class Check(object):
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def __init__(self):
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self.total1 = 0
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self.total2 = 0
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@property
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def add_control(self):
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self.total1 += 1
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return self.total1
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@threaded_cached_property
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def add_cached(self):
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self.total2 += 1
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return self.total2
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c = Check()
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# The control shows that we can continue to add 1.
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self.assertEqual(c.add_control, 1)
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self.assertEqual(c.add_control, 2)
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# The cached version demonstrates how nothing new is added
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self.assertEqual(c.add_cached, 1)
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self.assertEqual(c.add_cached, 1)
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def test_reset_cached_property(self):
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class Check(object):
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def __init__(self):
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self.total = 0
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@threaded_cached_property
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def add_cached(self):
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self.total += 1
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return self.total
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c = Check()
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# Run standard cache assertion
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self.assertEqual(c.add_cached, 1)
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self.assertEqual(c.add_cached, 1)
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# Reset the cache.
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del c.add_cached
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self.assertEqual(c.add_cached, 2)
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self.assertEqual(c.add_cached, 2)
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def test_none_cached_property(self):
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class Check(object):
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def __init__(self):
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self.total = None
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@threaded_cached_property
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def add_cached(self):
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return self.total
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c = Check()
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# Run standard cache assertion
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self.assertEqual(c.add_cached, None)
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class TestThreadingIssues(unittest.TestCase):
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def test_threads(self):
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""" How well does this implementation work with threads?"""
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class Check(object):
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def __init__(self):
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self.total = 0
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self.lock = Lock()
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@threaded_cached_property
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def add_cached(self):
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sleep(1)
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# Need to guard this since += isn't atomic.
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with self.lock:
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self.total += 1
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return self.total
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c = Check()
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threads = []
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for x in range(10):
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thread = Thread(target=lambda: c.add_cached)
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thread.start()
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threads.append(thread)
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for thread in threads:
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thread.join()
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self.assertEqual(c.add_cached, 1)
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