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import operator
import unittest
from cachetools import LRUCache, cachedmethod, keys
class Cached:
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=keys.typedkey)
def get_typed(self, value):
count = self.count
self.count += 1
return count
# https://github.com/tkem/cachetools/issues/107
def __hash__(self):
raise TypeError("unhashable type")
class Locked:
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.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.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.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.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.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(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
import gc
# 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.get(0), 0)
gc.collect()
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.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(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.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)
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