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test_caches.py
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from cachebox import (
BaseCacheImpl,
Cache,
FIFOCache,
RRCache,
TTLCache,
LRUCache,
LFUCache,
VTTLCache,
cache_iterator,
fifocache_iterator,
ttlcache_iterator,
lrucache_iterator,
lfucache_iterator,
)
import pytest
import time
from .mixin import _TestMixin
def test___new__():
with pytest.raises(NotImplementedError):
BaseCacheImpl()
def test_subclass():
class _TestSubclass(BaseCacheImpl):
def __init__(self) -> None:
self.a = 1
def inc(self, x: int):
self.a += x
t = _TestSubclass()
t.inc(10)
assert t.a == 11
class TestCache(_TestMixin):
CACHE = Cache
NO_POLICY = True
ITERATOR_CLASS = cache_iterator
def test_pickle(self):
self._test_pickle(lambda c1, c2: None)
class TestFIFOCache(_TestMixin):
CACHE = FIFOCache
ITERATOR_CLASS = fifocache_iterator
def test_policy(self):
cache = FIFOCache(5)
cache[0] = 0
cache[1] = 1
cache[2] = 2
assert cache[0] == 0
assert cache[1] == 1
assert cache.popitem() == (0, 0)
cache[3] = 3
assert cache.popitem() == (1, 1)
assert cache.popitem() == (2, 2)
assert cache.popitem() == (3, 3)
with pytest.raises(KeyError):
cache.popitem()
for i in range(5):
cache[i] = i
for i in range(5):
assert i in cache
cache[10] = 10
assert 0 not in cache
assert 10 in cache
assert cache.popitem() == (1, 1)
del cache[2]
del cache[3]
del cache[4]
assert cache.popitem() == (10, 10)
def test_ordered_iterators(self):
obj = self.CACHE(100, **self.KWARGS, capacity=100)
for i in range(6):
obj[i] = i * 2
k = list(range(6))
v = list(i * 2 for i in range(6))
assert k == list(obj.keys())
assert v == list(obj.values())
assert list(zip(k, v)) == list(obj.items())
def test_pickle(self):
def inner(c1, c2):
assert list(c1.items()) == list(c2.items())
self._test_pickle(inner)
def test_first_last(self):
obj = self.CACHE(5, **self.KWARGS, capacity=5)
for i in range(5):
obj[i] = i * 2
assert obj.first() == 0
assert obj.last() == 4
obj[10] = 20
assert obj.first() == 1
assert obj.last() == 10
class TestRRCache(_TestMixin):
CACHE = RRCache
ITERATOR_CLASS = cache_iterator
def test_pickle(self):
self._test_pickle(lambda c1, c2: None)
class TestTTLCache(_TestMixin):
CACHE = TTLCache
KWARGS = {"ttl": 10}
ITERATOR_CLASS = ttlcache_iterator
def test_policy(self):
obj = self.CACHE(2, 0.5)
assert obj.ttl == 0.5
obj.insert(0, 1)
time.sleep(0.8)
with pytest.raises(KeyError):
obj[0]
obj = self.CACHE(2, 20)
obj.insert(0, 0)
obj.insert(1, 1)
obj.insert(2, 2)
assert 0 not in obj
assert (1, 1) == obj.popitem()
def test_update_with_ttl(self):
obj = self.CACHE(2, 0.5)
# obj.update({1: 1, 2: 2, 3: 3})
obj.update((i + 1, i + 1) for i in range(3))
with pytest.raises(KeyError):
obj[1]
time.sleep(0.8)
with pytest.raises(KeyError):
obj[2]
with pytest.raises(KeyError):
obj[3]
def test_policy_ttl_no_care(self):
cache = TTLCache(5, 10)
cache[0] = 0
cache[1] = 1
cache[2] = 2
assert cache[0] == 0
assert cache[1] == 1
assert cache.popitem() == (0, 0)
cache[3] = 3
assert cache.popitem() == (1, 1)
assert cache.popitem() == (2, 2)
assert cache.popitem() == (3, 3)
with pytest.raises(KeyError):
cache.popitem()
for i in range(5):
cache[i] = i
for i in range(5):
assert i in cache
cache[10] = 10
assert 0 not in cache
assert 10 in cache
assert cache.popitem() == (1, 1)
del cache[2]
del cache[3]
del cache[4]
assert cache.popitem() == (10, 10)
def test_pickle(self):
def inner(c1, c2):
assert list(c1.items()) == list(c2.items())
self._test_pickle(inner)
def test_first_last(self):
obj = self.CACHE(5, **self.KWARGS, capacity=5)
for i in range(5):
obj[i] = i * 2
assert obj.first() == 0
assert obj.last() == 4
obj[10] = 20
assert obj.first() == 1
assert obj.last() == 10
def test_get_with_expire(self):
obj = TTLCache(2, 10)
obj.insert(1, 1)
time.sleep(0.1)
value, dur = obj.get_with_expire(1)
assert 1 == value
assert 10 > dur > 9, "10 > dur > 9 failed [dur: %f]" % dur
value, dur = obj.get_with_expire("no-exists")
assert value is None
assert 0 == dur
value, dur = obj.get_with_expire("no-exists", "value")
assert "value" == value
assert 0 == dur
def test_pop_with_expire(self):
obj = TTLCache(2, 10)
obj.insert(1, 1)
time.sleep(0.1)
value, dur = obj.pop_with_expire(1)
assert 1 == value
assert 10 > dur > 9, "10 > dur > 9 failed [dur: %f]" % dur
value, dur = obj.pop_with_expire("no-exists")
assert value is None
assert 0 == dur
value, dur = obj.pop_with_expire("no-exists", "value")
assert "value" == value
assert 0 == dur
def test_popitem_with_expire(self):
obj = TTLCache(2, 10)
obj.insert(1, 1)
obj.insert(2, 2)
time.sleep(0.1)
key, value, dur = obj.popitem_with_expire()
assert (1, 1) == (key, value)
assert 10 > dur > 9, "10 > dur > 9 failed [dur: %f]" % dur
key, value, dur = obj.popitem_with_expire()
assert (2, 2) == (key, value)
assert 10 > dur > 9, "10 > dur > 9 failed [dur: %f]" % dur
with pytest.raises(KeyError):
obj.popitem_with_expire()
class TestLRUCache(_TestMixin):
CACHE = LRUCache
ITERATOR_CLASS = lrucache_iterator
def test_policy(self):
obj = self.CACHE(3)
obj[1] = 1
obj[2] = 2
obj[3] = 3
assert (1, 1) == obj.popitem()
obj[1] = 1
obj[2]
assert (3, 3) == obj.popitem()
obj[4] = 4
assert 1 == obj.get(1)
obj[5] = 5
assert 2 not in obj
def test_ordered_iterators(self):
obj = self.CACHE(20, **self.KWARGS, capacity=20)
for i in range(6):
obj[i] = i * 2
obj[1]
obj[5]
obj[3] = 7
k = [0, 2, 4, 1, 5, 3]
v = [0, 4, 8, 2, 10, 7]
assert k == list(obj.keys())
assert v == list(obj.values())
assert list(zip(k, v)) == list(obj.items())
def test_recently_used_funcs(self):
obj = LRUCache(10)
for i in range(6):
obj[i] = i * 2
obj[1]
obj[5]
obj[3] = 7
obj.peek(4)
assert obj.most_recently_used() == 3
assert obj.least_recently_used() == 0
assert obj.least_recently_used(1) == 2
assert obj.least_recently_used(5) == 3
assert obj.least_recently_used(6) is None
def test_pickle(self):
def inner(c1, c2):
assert list(c1.items()) == list(c2.items())
self._test_pickle(inner)
class TestLFUCache(_TestMixin):
CACHE = LFUCache
ITERATOR_CLASS = lfucache_iterator
def test_policy(self):
obj = self.CACHE(5, {i: i for i in range(5)})
for i in range(5):
obj[i] = i
for i in range(10):
assert 0 == obj[0]
for i in range(7):
assert 1 == obj[1]
for i in range(3):
assert 2 == obj[2]
for i in range(4):
assert 3 == obj[3]
for i in range(6):
assert 4 == obj[4]
assert (2, 2) == obj.popitem()
assert (3, 3) == obj.popitem()
for i in range(10):
assert 4 == obj.get(4)
assert (1, 1) == obj.popitem()
assert 2 == len(obj)
obj.clear()
for i in range(5):
obj[i] = i
assert [0, 1, 2, 3, 4] == list(obj.keys())
for i in range(10):
obj[0] += 1
for i in range(7):
obj[1] += 1
for i in range(3):
obj[2] += 1
for i in range(4):
obj[3] += 1
for i in range(6):
obj[4] += 1
obj[5] = 4
assert [5, 3, 4, 1, 0] == list(obj.keys())
def test_least_frequently_used(self):
obj = LFUCache(10)
for i in range(5):
obj[i] = i * 2
for i in range(10):
obj[0] += 1
for i in range(7):
obj[1] += 1
for i in range(3):
obj[2] += 1
for i in range(4):
obj[3] += 1
for i in range(6):
obj[4] += 1
assert obj.least_frequently_used() == 2
assert obj.least_frequently_used(1) == 3
assert obj.least_frequently_used(4) == 0
assert obj.least_frequently_used(5) is None
def test_pickle(self):
def inner(c1, c2):
assert list(c1.items()) == list(c2.items())
self._test_pickle(inner)
class TestVTTLCache(_TestMixin):
CACHE = VTTLCache
def test_policy(self):
obj = VTTLCache(2)
obj.insert(0, 1, 0.5)
time.sleep(0.501)
with pytest.raises(KeyError):
obj[0]
obj.insert("name", "nick", 0.3)
obj.insert("age", 18, None)
time.sleep(0.301)
with pytest.raises(KeyError):
obj["name"]
del obj["age"]
obj.insert(0, 0, 70)
obj.insert(1, 1, 60)
obj.insert(2, 2, 90)
assert 1 not in obj
assert (0, 0) == obj.popitem()
def test_update_with_ttl(self):
obj = VTTLCache(3)
obj.update({1: 1, 2: 2, 3: 3}, 0.5)
time.sleep(0.501)
with pytest.raises(KeyError):
obj[1]
with pytest.raises(KeyError):
obj[2]
with pytest.raises(KeyError):
obj[3]
def test_get_with_expire(self):
obj = VTTLCache(2)
obj.insert(1, 1, 10)
time.sleep(0.1)
value, dur = obj.get_with_expire(1)
assert 1 == value
assert 10 > dur > 9, "10 > dur > 9 failed [dur: %f]" % dur
value, dur = obj.get_with_expire("no-exists")
assert value is None
assert 0 == dur
value, dur = obj.get_with_expire("no-exists", "value")
assert "value" == value
assert 0 == dur
def test_pop_with_expire(self):
obj = VTTLCache(2)
obj.insert(1, 1, 10)
time.sleep(0.1)
value, dur = obj.pop_with_expire(1)
assert 1 == value
assert 10 > dur > 9, "10 > dur > 9 failed [dur: %f]" % dur
value, dur = obj.pop_with_expire("no-exists")
assert value is None
assert 0 == dur
value, dur = obj.pop_with_expire("no-exists", "value")
assert "value" == value
assert 0 == dur
def test_popitem_with_expire(self):
obj = VTTLCache(2)
obj.insert(1, 1, 10)
obj.insert(2, 2, 6)
time.sleep(0.1)
key, value, dur = obj.popitem_with_expire()
assert (2, 2) == (key, value)
assert 6 > dur > 5, "6 > dur > 5 failed [dur: %f]" % dur
key, value, dur = obj.popitem_with_expire()
assert (1, 1) == (key, value)
assert 10 > dur > 9, "10 > dur > 9 failed [dur: %f]" % dur
with pytest.raises(KeyError):
obj.popitem_with_expire()
def test_pickle(self):
def inner(c1, c2):
assert list(c1.items()) == list(c2.items())
import pickle
import tempfile
c1 = self.CACHE(maxsize=0, **self.KWARGS)
c2 = pickle.loads(pickle.dumps(c1))
assert c1 == c2
assert c1.capacity() == c2.capacity()
c1 = self.CACHE(maxsize=100, **self.KWARGS)
for i in range(10):
c1.insert(i, i * 2, i + 2)
c2 = pickle.loads(pickle.dumps(c1))
assert c1 == c2
assert c1.capacity() == c2.capacity()
inner(c1, c2)
with tempfile.TemporaryFile("w+b") as fd:
c1 = self.CACHE(maxsize=100, **self.KWARGS)
c1.update({i: i for i in range(10)})
for i in range(10):
c1.insert(i, i * 2, i + 2)
pickle.dump(c1, fd)
fd.seek(0)
c2 = pickle.load(fd)
assert c1 == c2
assert c1.capacity() == c2.capacity()
inner(c1, c2)
c1 = self.CACHE(maxsize=100, **self.KWARGS)
for i in range(10):
c1.insert(i, i * 2, i + 0.5)
time.sleep(0.51)
c2 = pickle.loads(pickle.dumps(c1))
assert len(c2) == len(c1)
assert c1.capacity() == c2.capacity()
inner(c1, c2)