def test_cache_size(self):
cache = lru_cache.LRUCache(max_cache=10)
self.assertEqual(10, cache.cache_size())
cache = lru_cache.LRUCache(max_cache=256)
self.assertEqual(256, cache.cache_size())
cache.resize(512)
self.assertEqual(512, cache.cache_size())
def test_len(self):
cache = lru_cache.LRUCache(max_cache=10, after_cleanup_count=10)
cache[1] = 10
cache[2] = 20
cache[3] = 30
cache[4] = 40
self.assertEqual(4, len(cache))
cache[5] = 50
cache[6] = 60
cache[7] = 70
cache[8] = 80
self.assertEqual(8, len(cache))
cache[1] = 15 # replacement
self.assertEqual(8, len(cache))
cache[9] = 90
cache[10] = 100
cache[11] = 110
# We hit the max
self.assertEqual(10, len(cache))
self.assertEqual([11, 10, 9, 1, 8, 7, 6, 5, 4, 3],
[n.key for n in cache._walk_lru()])
def test_missing(self):
cache = lru_cache.LRUCache(max_cache=10)
self.assertFalse('foo' in cache)
self.assertRaises(KeyError, cache.__getitem__, 'foo')
cache['foo'] = 'bar'
self.assertEqual('bar', cache['foo'])
self.assertTrue('foo' in cache)
self.assertFalse('bar' in cache)
def test_keys(self):
cache = lru_cache.LRUCache(max_cache=5, after_cleanup_count=5)
cache[1] = 2
cache[2] = 3
cache[3] = 4
self.assertEqual([1, 2, 3], sorted(cache.keys()))
cache[4] = 5
cache[5] = 6
cache[6] = 7
self.assertEqual([2, 3, 4, 5, 6], sorted(cache.keys()))
def test_get(self):
cache = lru_cache.LRUCache(max_cache=5)
cache.add(1, 10)
cache.add(2, 20)
self.assertEqual(20, cache.get(2))
self.assertEqual(None, cache.get(3))
obj = object()
self.assertTrue(obj is cache.get(3, obj))
self.assertEqual([2, 1], [n.key for n in cache._walk_lru()])
self.assertEqual(10, cache.get(1))
self.assertEqual([1, 2], [n.key for n in cache._walk_lru()])
def test_overflow(self):
"""Adding extra entries will pop out old ones."""
cache = lru_cache.LRUCache(max_cache=1, after_cleanup_count=1)
cache['foo'] = 'bar'
# With a max cache of 1, adding 'baz' should pop out 'foo'
cache['baz'] = 'biz'
self.assertFalse('foo' in cache)
self.assertTrue('baz' in cache)
self.assertEqual('biz', cache['baz'])
def test_by_usage(self):
"""Accessing entries bumps them up in priority."""
cache = lru_cache.LRUCache(max_cache=2)
cache['baz'] = 'biz'
cache['foo'] = 'bar'
self.assertEqual('biz', cache['baz'])
# This must kick out 'foo' because it was the last accessed
cache['nub'] = 'in'
self.assertFalse('foo' in cache)
def test_cleanup_2(self):
cache = lru_cache.LRUCache(max_cache=5, after_cleanup_count=2)
# Add these in order
cache.add(1, 10)
cache.add(2, 20)
cache.add(3, 25)
cache.add(4, 30)
cache.add(5, 35)
self.assertEqual(5, len(cache))
# Force a compaction
cache.cleanup()
self.assertEqual(2, len(cache))
def test_cleanup_shrinks_to_after_clean_count(self):
cache = lru_cache.LRUCache(max_cache=5, after_cleanup_count=3)
cache.add(1, 10)
cache.add(2, 20)
cache.add(3, 25)
cache.add(4, 30)
cache.add(5, 35)
self.assertEqual(5, len(cache))
# This will bump us over the max, which causes us to shrink down to
# after_cleanup_cache size
cache.add(6, 40)
self.assertEqual(3, len(cache))
def test_map_None(self):
# Make sure that we can properly map None as a key.
cache = lru_cache.LRUCache(max_cache=10)
self.assertFalse(None in cache)
cache[None] = 1
self.assertEqual(1, cache[None])
cache[None] = 2
self.assertEqual(2, cache[None])
# Test the various code paths of __getitem__, to make sure that we can
# handle when None is the key for the LRU and the MRU
cache[1] = 3
cache[None] = 1
cache[None]
cache[1]
cache[None]
self.assertEqual([None, 1], [n.key for n in cache._walk_lru()])
def test_preserve_last_access_order(self):
cache = lru_cache.LRUCache(max_cache=5)
# Add these in order
cache.add(1, 10)
cache.add(2, 20)
cache.add(3, 25)
cache.add(4, 30)
cache.add(5, 35)
self.assertEqual([5, 4, 3, 2, 1], [n.key for n in cache._walk_lru()])
# Now access some randomly
cache[2]
cache[5]
cache[3]
cache[2]
self.assertEqual([2, 3, 5, 4, 1], [n.key for n in cache._walk_lru()])
def test_resize_smaller(self):
cache = lru_cache.LRUCache(max_cache=5, after_cleanup_count=4)
cache[1] = 2
cache[2] = 3
cache[3] = 4
cache[4] = 5
cache[5] = 6
self.assertEqual([1, 2, 3, 4, 5], sorted(cache.keys()))
cache[6] = 7
self.assertEqual([3, 4, 5, 6], sorted(cache.keys()))
# Now resize to something smaller, which triggers a cleanup
cache.resize(max_cache=3, after_cleanup_count=2)
self.assertEqual([5, 6], sorted(cache.keys()))
# Adding something will use the new size
cache[7] = 8
self.assertEqual([5, 6, 7], sorted(cache.keys()))
cache[8] = 9
self.assertEqual([7, 8], sorted(cache.keys()))
def test_cleanup_on_replace(self):
"""Replacing an object should cleanup the old value."""
cleanup_called = []
def cleanup_func(key, val):
cleanup_called.append((key, val))
cache = lru_cache.LRUCache(max_cache=2)
cache.add(1, 10, cleanup=cleanup_func)
cache.add(2, 20, cleanup=cleanup_func)
cache.add(2, 25, cleanup=cleanup_func)
self.assertEqual([(2, 20)], cleanup_called)
self.assertEqual(25, cache[2])
# Even __setitem__ should make sure cleanup() is called
cache[2] = 26
self.assertEqual([(2, 20), (2, 25)], cleanup_called)
def test_resize_larger(self):
cache = lru_cache.LRUCache(max_cache=5, after_cleanup_count=4)
cache[1] = 2
cache[2] = 3
cache[3] = 4
cache[4] = 5
cache[5] = 6
self.assertEqual([1, 2, 3, 4, 5], sorted(cache.keys()))
cache[6] = 7
self.assertEqual([3, 4, 5, 6], sorted(cache.keys()))
cache.resize(max_cache=8, after_cleanup_count=6)
self.assertEqual([3, 4, 5, 6], sorted(cache.keys()))
cache[7] = 8
cache[8] = 9
cache[9] = 10
cache[10] = 11
self.assertEqual([3, 4, 5, 6, 7, 8, 9, 10], sorted(cache.keys()))
cache[11] = 12 # triggers cleanup back to new after_cleanup_count
self.assertEqual([6, 7, 8, 9, 10, 11], sorted(cache.keys()))
def test_cleanup(self):
"""Test that we can use a cleanup function."""
cleanup_called = []
def cleanup_func(key, val):
cleanup_called.append((key, val))
cache = lru_cache.LRUCache(max_cache=2, after_cleanup_count=2)
cache.add('baz', '1', cleanup=cleanup_func)
cache.add('foo', '2', cleanup=cleanup_func)
cache.add('biz', '3', cleanup=cleanup_func)
self.assertEqual([('baz', '1')], cleanup_called)
# 'foo' is now most recent, so final cleanup will call it last
cache['foo']
cache.clear()
self.assertEqual([('baz', '1'), ('biz', '3'), ('foo', '2')],
cleanup_called)
def test_after_cleanup_larger_than_max(self):
cache = lru_cache.LRUCache(max_cache=5, after_cleanup_count=10)
self.assertEqual(5, cache._after_cleanup_count)
def test_after_cleanup_none(self):
cache = lru_cache.LRUCache(max_cache=5, after_cleanup_count=None)
# By default _after_cleanup_size is 80% of the normal size
self.assertEqual(4, cache._after_cleanup_count)
def test_add__null_key(self):
cache = lru_cache.LRUCache(max_cache=10)
self.assertRaises(ValueError, cache.add, lru_cache._null_key, 1)