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# Copyright (C) 2009 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Tests for the StaticTupleInterned type."""
import sys
from bzrlib import (
# _static_tuple_py,
errors,
osutils,
tests,
)
from bzrlib.tests import (
test__static_tuple,
)
try:
from bzrlib import _static_tuple_interned_pyx as _module
except ImportError:
_module = None
try:
from bzrlib._static_tuple_c import StaticTuple
except ImportError:
pass
# Even though this is an extension, we don't permute the tests for a python
# version. As the plain python version is just a dict.
class _CompiledStaticTupleInterned(tests.Feature):
def _probe(self):
if _module is None:
return False
return True
def feature_name(self):
return 'bzrlib._static_tuple_interned_pyx'
CompiledStaticTupleInterned = _CompiledStaticTupleInterned()
class TestStaticTupleInterned(tests.TestCase):
_test_needs_features = [CompiledStaticTupleInterned,
test__static_tuple.CompiledStaticTuple]
def assertIn(self, obj, container):
self.assertTrue(obj in container,
'%s not found in %s' % (obj, container))
def assertNotIn(self, obj, container):
self.assertTrue(obj not in container,
'We found %s in %s' % (obj, container))
def assertFillState(self, used, fill, mask, obj):
self.assertEqual((used, fill, mask), (obj.used, obj.fill, obj.mask))
def assertRefcount(self, count, obj):
"""Assert that the refcount for obj is what we expect.
Note that this automatically adjusts for the fact that calling
assertRefcount actually creates a new pointer, as does calling
sys.getrefcount. So pass the expected value *before* the call.
"""
# I don't understand why it is count+3 here, but it seems to be
# correct. If I check in the calling function, with:
# self.assertEqual(count+1, sys.getrefcount(obj))
# Then it works fine. Something about passing it to assertRefcount is
# actually double-incrementing (and decrementing) the refcount
self.assertEqual(count+3, sys.getrefcount(obj))
def test_initial(self):
obj = _module.StaticTupleInterner()
self.assertEqual(0, len(obj))
st = StaticTuple('foo', 'bar')
self.assertFillState(0, 0, 0x3ff, obj)
def test__lookup(self):
# The tuple hash function is rather good at entropy. For all integers
# 0=>1023, hash((i,)) & 1023 maps to a unique output, and hash((i,j))
# maps to all 1024 fields evenly.
# However, hash((c,d))& 1023 for characters has an uneven distribution
# of collisions, for example:
# ('a', 'a'), ('f', '4'), ('p', 'r'), ('q', '1'), ('F', 'T'),
# ('Q', 'Q'), ('V', 'd'), ('7', 'C')
# all collide @ 643
obj = _module.StaticTupleInterner()
offset, val = obj._test_lookup(StaticTuple('a', 'a'))
self.assertEqual(643, offset)
self.assertEqual('<null>', val)
offset, val = obj._test_lookup(StaticTuple('f', '4'))
self.assertEqual(643, offset)
self.assertEqual('<null>', val)
offset, val = obj._test_lookup(StaticTuple('p', 'r'))
self.assertEqual(643, offset)
self.assertEqual('<null>', val)
def test_get_set_del_with_collisions(self):
obj = _module.StaticTupleInterner()
k1 = StaticTuple('a', 'a')
k2 = StaticTuple('f', '4') # collides
k3 = StaticTuple('p', 'r')
k4 = StaticTuple('q', '1')
self.assertEqual((643, '<null>'), obj._test_lookup(k1))
self.assertEqual((643, '<null>'), obj._test_lookup(k2))
self.assertEqual((643, '<null>'), obj._test_lookup(k3))
self.assertEqual((643, '<null>'), obj._test_lookup(k4))
obj.add(k1)
self.assertIn(k1, obj)
self.assertNotIn(k2, obj)
self.assertNotIn(k3, obj)
self.assertNotIn(k4, obj)
self.assertEqual((643, k1), obj._test_lookup(k1))
self.assertEqual((787, '<null>'), obj._test_lookup(k2))
self.assertEqual((787, '<null>'), obj._test_lookup(k3))
self.assertEqual((787, '<null>'), obj._test_lookup(k4))
self.assertIs(k1, obj[k1])
obj.add(k2)
self.assertIs(k2, obj[k2])
self.assertEqual((643, k1), obj._test_lookup(k1))
self.assertEqual((787, k2), obj._test_lookup(k2))
self.assertEqual((660, '<null>'), obj._test_lookup(k3))
# Even though k4 collides for the first couple of iterations, the hash
# perturbation uses the full width hash (not just the masked value), so
# it now diverges
self.assertEqual((180, '<null>'), obj._test_lookup(k4))
self.assertEqual((643, k1), obj._test_lookup(('a', 'a')))
self.assertEqual((787, k2), obj._test_lookup(('f', '4')))
self.assertEqual((660, '<null>'), obj._test_lookup(('p', 'r')))
self.assertEqual((180, '<null>'), obj._test_lookup(('q', '1')))
obj.add(k3)
self.assertIs(k3, obj[k3])
self.assertIn(k1, obj)
self.assertIn(k2, obj)
self.assertIn(k3, obj)
self.assertNotIn(k4, obj)
del obj[k1]
self.assertEqual((643, '<dummy>'), obj._test_lookup(k1))
self.assertEqual((787, k2), obj._test_lookup(k2))
self.assertEqual((660, k3), obj._test_lookup(k3))
self.assertEqual((643, '<dummy>'), obj._test_lookup(k4))
self.assertNotIn(k1, obj)
self.assertIn(k2, obj)
self.assertIn(k3, obj)
self.assertNotIn(k4, obj)
def test_add(self):
obj = _module.StaticTupleInterner()
self.assertFillState(0, 0, 0x3ff, obj)
k1 = StaticTuple('foo')
self.assertRefcount(1, k1)
self.assertIs(k1, obj.add(k1))
self.assertFillState(1, 1, 0x3ff, obj)
self.assertRefcount(2, k1)
ktest = obj[k1]
self.assertRefcount(3, k1)
self.assertIs(k1, ktest)
del ktest
self.assertRefcount(2, k1)
k2 = StaticTuple('foo')
self.assertRefcount(1, k2)
self.assertIsNot(k1, k2)
# doesn't add anything, so the counters shouldn't be adjusted
self.assertIs(k1, obj.add(k2))
self.assertFillState(1, 1, 0x3ff, obj)
self.assertRefcount(2, k1) # not changed
self.assertRefcount(1, k2) # not incremented
self.assertIs(k1, obj[k1])
self.assertIs(k1, obj[k2])
self.assertRefcount(2, k1)
self.assertRefcount(1, k2)
# Deleting an entry should remove the fill, but not the used
del obj[k1]
self.assertFillState(0, 1, 0x3ff, obj)
self.assertRefcount(1, k1)
k3 = StaticTuple('bar')
self.assertRefcount(1, k3)
self.assertIs(k3, obj.add(k3))
self.assertFillState(1, 2, 0x3ff, obj)
self.assertRefcount(2, k3)
self.assertIs(k2, obj.add(k2))
self.assertFillState(2, 2, 0x3ff, obj)
self.assertRefcount(1, k1)
self.assertRefcount(2, k2)
self.assertRefcount(2, k3)
def test_discard(self):
obj = _module.StaticTupleInterner()
k1 = StaticTuple('foo')
k2 = StaticTuple('foo')
k3 = StaticTuple('bar')
self.assertRefcount(1, k1)
self.assertRefcount(1, k2)
self.assertRefcount(1, k3)
obj.add(k1)
self.assertRefcount(2, k1)
self.assertEqual(0, obj.discard(k3))
self.assertRefcount(1, k3)
obj.add(k3)
self.assertRefcount(2, k3)
self.assertEqual(1, obj.discard(k3))
self.assertRefcount(1, k3)
def test__delitem__(self):
obj = _module.StaticTupleInterner()
k1 = StaticTuple('foo')
k2 = StaticTuple('foo')
k3 = StaticTuple('bar')
self.assertRefcount(1, k1)
self.assertRefcount(1, k2)
self.assertRefcount(1, k3)
obj.add(k1)
self.assertRefcount(2, k1)
self.assertRaises(KeyError, obj.__delitem__, k3)
self.assertRefcount(1, k3)
obj.add(k3)
self.assertRefcount(2, k3)
del obj[k3]
self.assertRefcount(1, k3)
def test__resize(self):
obj = _module.StaticTupleInterner()
k1 = StaticTuple('foo')
k2 = StaticTuple('bar')
k3 = StaticTuple('baz')
obj.add(k1)
obj.add(k2)
obj.add(k3)
del obj[k2]
self.assertFillState(2, 3, 0x3ff, obj)
self.assertEqual(1024, obj._resize(500))
self.assertFillState(2, 3, 0x3ff, obj)
self.assertEqual(4096, obj._resize(4095))
self.assertFillState(2, 2, 0xfff, obj)
self.assertIn(k1, obj)
self.assertNotIn(k2, obj)
self.assertIn(k3, obj)
obj.add(k2)
self.assertIn(k2, obj)
del obj[k2]
self.assertEqual((591, '<dummy>'), obj._test_lookup(k2))
self.assertFillState(2, 3, 0xfff, obj)
self.assertEqual(2048, obj._resize(1024))
self.assertFillState(2, 2, 0x7ff, obj)
self.assertEqual((591, '<null>'), obj._test_lookup(k2))
def test_add_lots_of_items(self):
obj = _module.StaticTupleInterner()
chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890'
for i in chars:
for j in chars:
k = StaticTuple(i, j)
obj.add(k)
num = len(chars)*len(chars)
self.assertFillState(num, num, 0x1fff, obj)
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