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import operator
import unittest
from cachetools import LRUCache, cachedmethod
class Cached(object):
count = 0
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'), typed=True)
def get_typed(self, value):
count = self.count
self.count += 1
return count
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(), 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)
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