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import operator
import unittest
import warnings
from cachetools import LRUCache, cachedmethod, typedkey
class Cached(object):
def __init__(self, cache, count=0):
self.cache = cache
self.count = count
@cachedmethod(operator.attrgetter('cache'))
def get(self, value):
count = self.count
self.count += 1
return count
@cachedmethod(operator.attrgetter('cache'), key=typedkey)
def get_typed(self, value):
count = self.count
self.count += 1
return count
class Locked(object):
def __init__(self, cache):
self.cache = cache
self.count = 0
@cachedmethod(operator.attrgetter('cache'), lock=lambda self: self)
def get(self, value):
return self.count
def __enter__(self):
self.count += 1
def __exit__(self, *exc):
pass
class CachedMethodTest(unittest.TestCase):
def test_dict(self):
cached = Cached({})
self.assertEqual(cached.cache, cached.get.cache(cached))
self.assertEqual(cached.get(0), 0)
self.assertEqual(cached.get(1), 1)
self.assertEqual(cached.get(1), 1)
self.assertEqual(cached.get(1.0), 1)
self.assertEqual(cached.get(1.0), 1)
cached.cache.clear()
self.assertEqual(cached.get(1), 2)
def test_typed_dict(self):
cached = Cached(LRUCache(maxsize=2))
self.assertEqual(cached.cache, cached.get_typed.cache(cached))
self.assertEqual(cached.get_typed(0), 0)
self.assertEqual(cached.get_typed(1), 1)
self.assertEqual(cached.get_typed(1), 1)
self.assertEqual(cached.get_typed(1.0), 2)
self.assertEqual(cached.get_typed(1.0), 2)
self.assertEqual(cached.get_typed(0.0), 3)
self.assertEqual(cached.get_typed(0), 4)
def test_lru(self):
cached = Cached(LRUCache(maxsize=2))
self.assertEqual(cached.cache, cached.get.cache(cached))
self.assertEqual(cached.get(0), 0)
self.assertEqual(cached.get(1), 1)
self.assertEqual(cached.get(1), 1)
self.assertEqual(cached.get(1.0), 1)
self.assertEqual(cached.get(1.0), 1)
cached.cache.clear()
self.assertEqual(cached.get(1), 2)
def test_typed_lru(self):
cached = Cached(LRUCache(maxsize=2))
self.assertEqual(cached.cache, cached.get_typed.cache(cached))
self.assertEqual(cached.get_typed(0), 0)
self.assertEqual(cached.get_typed(1), 1)
self.assertEqual(cached.get_typed(1), 1)
self.assertEqual(cached.get_typed(1.0), 2)
self.assertEqual(cached.get_typed(1.0), 2)
self.assertEqual(cached.get_typed(0.0), 3)
self.assertEqual(cached.get_typed(0), 4)
def test_nospace(self):
cached = Cached(LRUCache(maxsize=0))
self.assertEqual(cached.cache, cached.get.cache(cached))
self.assertEqual(cached.get(0), 0)
self.assertEqual(cached.get(1), 1)
self.assertEqual(cached.get(1), 2)
self.assertEqual(cached.get(1.0), 3)
self.assertEqual(cached.get(1.0), 4)
def test_nocache(self):
cached = Cached(None)
self.assertEqual(None, cached.get.cache(cached))
self.assertEqual(cached.get(0), 0)
self.assertEqual(cached.get(1), 1)
self.assertEqual(cached.get(1), 2)
self.assertEqual(cached.get(1.0), 3)
self.assertEqual(cached.get(1.0), 4)
def test_weakref(self):
import weakref
import fractions
# in Python 3.4, `int` does not support weak references even
# when subclassed, but Fraction apparently does...
class Int(fractions.Fraction):
def __add__(self, other):
return Int(fractions.Fraction.__add__(self, other))
cached = Cached(weakref.WeakValueDictionary(), count=Int(0))
self.assertEqual(cached.cache, cached.get.cache(cached))
self.assertEqual(cached.get(0), 0)
self.assertEqual(cached.get(0), 1)
ref = cached.get(1)
self.assertEqual(ref, 2)
self.assertEqual(cached.get(1), 2)
self.assertEqual(cached.get(1.0), 2)
ref = cached.get_typed(1)
self.assertEqual(ref, 3)
self.assertEqual(cached.get_typed(1), 3)
self.assertEqual(cached.get_typed(1.0), 4)
cached.cache.clear()
self.assertEqual(cached.get(1), 5)
def test_locked_dict(self):
cached = Locked({})
self.assertEqual(cached.cache, cached.get.cache(cached))
self.assertEqual(cached.get(0), 1)
self.assertEqual(cached.get(1), 3)
self.assertEqual(cached.get(1), 3)
self.assertEqual(cached.get(1.0), 3)
self.assertEqual(cached.get(2.0), 7)
def test_locked_nocache(self):
cached = Locked(None)
self.assertEqual(None, cached.get.cache(cached))
self.assertEqual(cached.get(0), 0)
self.assertEqual(cached.get(1), 0)
self.assertEqual(cached.get(1), 0)
self.assertEqual(cached.get(1.0), 0)
self.assertEqual(cached.get(1.0), 0)
def test_locked_nospace(self):
cached = Locked(LRUCache(maxsize=0))
self.assertEqual(cached.cache, cached.get.cache(cached))
self.assertEqual(cached.get(0), 1)
self.assertEqual(cached.get(1), 3)
self.assertEqual(cached.get(1), 5)
self.assertEqual(cached.get(1.0), 7)
self.assertEqual(cached.get(1.0), 9)
def test_typed_deprecated(self):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter("always")
cachedmethod(lambda self: None, None)(lambda self: None)
self.assertIs(w[-1].category, DeprecationWarning)
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter("always")
cachedmethod(lambda self: None, False)(lambda self: None)
self.assertIs(w[-1].category, DeprecationWarning)
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter("always")
cachedmethod(lambda self: None, True)(lambda self: None)
self.assertIs(w[-1].category, DeprecationWarning)
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter("always")
cachedmethod(lambda self: None, typed=None)(lambda self: None)
self.assertIs(w[-1].category, DeprecationWarning)
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