19
19
from bzrlib import (
27
"""Test helper to walk the LRU list and assert its consistency"""
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node = lru._most_recently_used
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if node.prev is not None:
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raise AssertionError('the _most_recently_used entry is not'
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' supposed to have a previous entry'
34
while node is not None:
35
if node.next_key is lru_cache._null_key:
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if node is not lru._least_recently_used:
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raise AssertionError('only the last node should have'
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' no next value: %s' % (node,))
41
node_next = lru._cache[node.next_key]
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if node_next.prev is not node:
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raise AssertionError('inconsistency found, node.next.prev'
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' != node: %s' % (node,))
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if node is not lru._most_recently_used:
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raise AssertionError('only the _most_recently_used should'
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' not have a previous node: %s'
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if node.prev.next_key != node.key:
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raise AssertionError('inconsistency found, node.prev.next'
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' != node: %s' % (node,))
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58
class TestLRUCache(tests.TestCase):
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"""Test that LRU cache properly keeps track of entries."""
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self.assertFalse('foo' in cache)
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def test_cleanup(self):
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"""Test that we can use a cleanup function."""
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def cleanup_func(key, val):
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cleanup_called.append((key, val))
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cache = lru_cache.LRUCache(max_cache=2)
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cache.add('baz', '1', cleanup=cleanup_func)
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cache.add('foo', '2', cleanup=cleanup_func)
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cache.add('biz', '3', cleanup=cleanup_func)
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self.assertEqual([('baz', '1')], cleanup_called)
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# 'foo' is now most recent, so final cleanup will call it last
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self.assertEqual([('baz', '1'), ('biz', '3'), ('foo', '2')],
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def test_cleanup_on_replace(self):
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"""Replacing an object should cleanup the old value."""
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def cleanup_func(key, val):
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cleanup_called.append((key, val))
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cache = lru_cache.LRUCache(max_cache=2)
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cache.add(1, 10, cleanup=cleanup_func)
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cache.add(2, 20, cleanup=cleanup_func)
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cache.add(2, 25, cleanup=cleanup_func)
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self.assertEqual([(2, 20)], cleanup_called)
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self.assertEqual(25, cache[2])
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# Even __setitem__ should make sure cleanup() is called
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self.assertEqual([(2, 20), (2, 25)], cleanup_called)
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def test_cleanup_error_maintains_linked_list(self):
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def cleanup_func(key, val):
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cleanup_called.append((key, val))
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raise ValueError('failure during cleanup')
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cache = lru_cache.LRUCache(max_cache=10)
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cache.add(i, i, cleanup=cleanup_func)
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for i in xrange(10, 20):
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self.assertRaises(ValueError,
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cache.add, i, i, cleanup=cleanup_func)
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self.assertEqual([(i, i) for i in xrange(10)], cleanup_called)
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self.assertEqual(range(19, 9, -1), [n.key for n in cache._walk_lru()])
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def test_cleanup_during_replace_still_replaces(self):
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def cleanup_func(key, val):
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cleanup_called.append((key, val))
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raise ValueError('failure during cleanup')
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cache = lru_cache.LRUCache(max_cache=10)
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cache.add(i, i, cleanup=cleanup_func)
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self.assertRaises(ValueError,
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cache.add, 1, 20, cleanup=cleanup_func)
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# We also still update the recent access to this node
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self.assertEqual([1, 9, 8, 7, 6, 5, 4, 3, 2, 0],
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[n.key for n in cache._walk_lru()])
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self.assertEqual(20, cache[1])
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self.assertEqual([(1, 1)], cleanup_called)
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self.assertEqual([1, 9, 8, 7, 6, 5, 4, 3, 2, 0],
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[n.key for n in cache._walk_lru()])
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def test_cleanup_function_deprecated(self):
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"""Test that per-node cleanup functions are no longer allowed"""
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cache = lru_cache.LRUCache()
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self.assertRaises(ValueError, self.applyDeprecated,
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symbol_versioning.deprecated_in((2, 5, 0)),
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cache.add, "key", 1, cleanup=lambda: None)
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def test_len(self):
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cache = lru_cache.LRUCache(max_cache=10, after_cleanup_count=10)
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self.assertEqual(10, len(cache))
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self.assertEqual([11, 10, 9, 1, 8, 7, 6, 5, 4, 3],
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[n.key for n in cache._walk_lru()])
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[n.key for n in walk_lru(cache)])
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def test_cleanup_shrinks_to_after_clean_count(self):
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cache = lru_cache.LRUCache(max_cache=5, after_cleanup_count=3)
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self.assertEqual(5, len(cache))
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# This will bump us over the max, which causes us to shrink down to
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# after_cleanup_cache size
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self.assertEqual(3, len(cache))
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def test_after_cleanup_larger_than_max(self):
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cache = lru_cache.LRUCache(max_cache=5)
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# Add these in order
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self.assertEqual([5, 4, 3, 2, 1], [n.key for n in cache._walk_lru()])
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self.assertEqual([5, 4, 3, 2, 1], [n.key for n in walk_lru(cache)])
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# Now access some randomly
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self.assertEqual([2, 3, 5, 4, 1], [n.key for n in cache._walk_lru()])
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self.assertEqual([2, 3, 5, 4, 1], [n.key for n in walk_lru(cache)])
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def test_get(self):
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cache = lru_cache.LRUCache(max_cache=5)
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self.assertEqual(20, cache.get(2))
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self.assertIs(None, cache.get(3))
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self.assertIs(obj, cache.get(3, obj))
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self.assertEqual([2, 1], [n.key for n in cache._walk_lru()])
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self.assertEqual([2, 1], [n.key for n in walk_lru(cache)])
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self.assertEqual(10, cache.get(1))
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self.assertEqual([1, 2], [n.key for n in cache._walk_lru()])
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self.assertEqual([1, 2], [n.key for n in walk_lru(cache)])
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def test_keys(self):
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cache = lru_cache.LRUCache(max_cache=5, after_cleanup_count=5)
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def test_add__null_key(self):
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cache = lru_cache.LRUSizeCache()
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self.assertRaises(ValueError, cache.add, lru_cache._null_key, 1)
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self.assertRaises(ValueError,
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cache.__setitem__, lru_cache._null_key, 1)
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def test_add_tracks_size(self):
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cache = lru_cache.LRUSizeCache()
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self.assertEqual(0, cache._value_size)
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cache.add('my key', 'my value text')
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cache['my key'] = 'my value text'
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self.assertEqual(13, cache._value_size)
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def test_remove_tracks_size(self):
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cache = lru_cache.LRUSizeCache()
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self.assertEqual(0, cache._value_size)
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cache.add('my key', 'my value text')
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cache['my key'] = 'my value text'
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self.assertEqual(13, cache._value_size)
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node = cache._cache['my key']
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cache._remove_node(node)
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"""Adding a large value may not be cached at all."""
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cache = lru_cache.LRUSizeCache(max_size=10, after_cleanup_size=5)
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self.assertEqual(0, cache._value_size)
356
self.assertEqual({}, cache.items())
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cache.add('test', 'key')
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self.assertEqual(3, cache._value_size)
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self.assertEqual({'test': 'key'}, cache.items())
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cache.add('test2', 'key that is too big')
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self.assertEqual(3, cache._value_size)
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self.assertEqual({'test':'key'}, cache.items())
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self.assertEqual({}, cache.as_dict())
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cache['test'] = 'key'
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self.assertEqual(3, cache._value_size)
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self.assertEqual({'test': 'key'}, cache.as_dict())
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cache['test2'] = 'key that is too big'
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self.assertEqual(3, cache._value_size)
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self.assertEqual({'test':'key'}, cache.as_dict())
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# If we would add a key, only to cleanup and remove all cached entries,
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# then obviously that value should not be stored
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cache.add('test3', 'bigkey')
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self.assertEqual(3, cache._value_size)
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self.assertEqual({'test':'key'}, cache.items())
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cache.add('test4', 'bikey')
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self.assertEqual(3, cache._value_size)
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self.assertEqual({'test':'key'}, cache.items())
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def test_no_add_over_size_cleanup(self):
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"""If a large value is not cached, we will call cleanup right away."""
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def cleanup(key, value):
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cleanup_calls.append((key, value))
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cache = lru_cache.LRUSizeCache(max_size=10, after_cleanup_size=5)
380
self.assertEqual(0, cache._value_size)
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self.assertEqual({}, cache.items())
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cache.add('test', 'key that is too big', cleanup=cleanup)
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self.assertEqual(0, cache._value_size)
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self.assertEqual({}, cache.items())
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# and cleanup was called
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self.assertEqual([('test', 'key that is too big')], cleanup_calls)
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cache['test3'] = 'bigkey'
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self.assertEqual(3, cache._value_size)
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self.assertEqual({'test':'key'}, cache.as_dict())
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cache['test4'] = 'bikey'
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self.assertEqual(3, cache._value_size)
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self.assertEqual({'test':'key'}, cache.as_dict())
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def test_adding_clears_cache_based_on_size(self):
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"""The cache is cleared in LRU order until small enough"""
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cache = lru_cache.LRUSizeCache(max_size=20)
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cache.add('key1', 'value') # 5 chars
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cache.add('key2', 'value2') # 6 chars
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cache.add('key3', 'value23') # 7 chars
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cache['key1'] = 'value' # 5 chars
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cache['key2'] = 'value2' # 6 chars
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cache['key3'] = 'value23' # 7 chars
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self.assertEqual(5+6+7, cache._value_size)
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cache['key2'] # reference key2 so it gets a newer reference time
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cache.add('key4', 'value234') # 8 chars, over limit
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cache['key4'] = 'value234' # 8 chars, over limit
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# We have to remove 2 keys to get back under limit
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self.assertEqual(6+8, cache._value_size)
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self.assertEqual({'key2':'value2', 'key4':'value234'},
403
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def test_adding_clears_to_after_cleanup_size(self):
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cache = lru_cache.LRUSizeCache(max_size=20, after_cleanup_size=10)
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cache.add('key1', 'value') # 5 chars
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cache.add('key2', 'value2') # 6 chars
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cache.add('key3', 'value23') # 7 chars
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cache['key1'] = 'value' # 5 chars
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cache['key2'] = 'value2' # 6 chars
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cache['key3'] = 'value23' # 7 chars
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self.assertEqual(5+6+7, cache._value_size)
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cache['key2'] # reference key2 so it gets a newer reference time
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cache.add('key4', 'value234') # 8 chars, over limit
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cache['key4'] = 'value234' # 8 chars, over limit
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# We have to remove 3 keys to get back under limit
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363
self.assertEqual(8, cache._value_size)
413
self.assertEqual({'key4':'value234'}, cache.items())
364
self.assertEqual({'key4':'value234'}, cache.as_dict())
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366
def test_custom_sizes(self):
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def size_of_list(lst):
418
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cache = lru_cache.LRUSizeCache(max_size=20, after_cleanup_size=10,
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370
compute_size=size_of_list)
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cache.add('key1', ['val', 'ue']) # 5 chars
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cache.add('key2', ['val', 'ue2']) # 6 chars
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cache.add('key3', ['val', 'ue23']) # 7 chars
372
cache['key1'] = ['val', 'ue'] # 5 chars
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cache['key2'] = ['val', 'ue2'] # 6 chars
374
cache['key3'] = ['val', 'ue23'] # 7 chars
424
375
self.assertEqual(5+6+7, cache._value_size)
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cache['key2'] # reference key2 so it gets a newer reference time
426
cache.add('key4', ['value', '234']) # 8 chars, over limit
377
cache['key4'] = ['value', '234'] # 8 chars, over limit
427
378
# We have to remove 3 keys to get back under limit
428
379
self.assertEqual(8, cache._value_size)
429
self.assertEqual({'key4':['value', '234']}, cache.items())
380
self.assertEqual({'key4':['value', '234']}, cache.as_dict())
431
382
def test_cleanup(self):
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383
cache = lru_cache.LRUSizeCache(max_size=20, after_cleanup_size=10)
434
385
# Add these in order
435
cache.add('key1', 'value') # 5 chars
436
cache.add('key2', 'value2') # 6 chars
437
cache.add('key3', 'value23') # 7 chars
386
cache['key1'] = 'value' # 5 chars
387
cache['key2'] = 'value2' # 6 chars
388
cache['key3'] = 'value23' # 7 chars
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389
self.assertEqual(5+6+7, cache._value_size)
added
removed
bzrlib/tests/test_lru_cache.py
