[Zodb-checkins] SVN: ZODB/branches/tseaver-python_picklecache/src/persistent/ Snapshot.
Tres Seaver
tseaver at palladion.com
Thu Mar 19 11:36:43 EDT 2009
Log message for revision 98274:
Snapshot.
Changed:
U ZODB/branches/tseaver-python_picklecache/src/persistent/__init__.py
U ZODB/branches/tseaver-python_picklecache/src/persistent/interfaces.py
A ZODB/branches/tseaver-python_picklecache/src/persistent/picklecache.py
A ZODB/branches/tseaver-python_picklecache/src/persistent/tests/test_picklecache.py
-=-
Modified: ZODB/branches/tseaver-python_picklecache/src/persistent/__init__.py
===================================================================
--- ZODB/branches/tseaver-python_picklecache/src/persistent/__init__.py 2009-03-19 15:34:54 UTC (rev 98273)
+++ ZODB/branches/tseaver-python_picklecache/src/persistent/__init__.py 2009-03-19 15:36:43 UTC (rev 98274)
@@ -15,20 +15,37 @@
$Id$
"""
+try:
+ from cPersistence import Persistent
+ from cPersistence import GHOST
+ from cPersistence import UPTODATE
+ from cPersistence import CHANGED
+ from cPersistence import STICKY
+ from cPersistence import simple_new
+except ImportError: # XXX need pure-Python fallback
+ _HAVE_CPERSISTECE = False
+ from pyPersistence import Persistent
+ from pyPersistence import GHOST
+ from pyPersistence import UPTODATE
+ from pyPersistence import CHANGED
+ from pyPersistence import STICKY
+else:
+ _HAVE_CPERSISTECE = True
+ import copy_reg
+ copy_reg.constructor(simple_new)
-from cPersistence import Persistent, GHOST, UPTODATE, CHANGED, STICKY
-from cPickleCache import PickleCache
-
-from cPersistence import simple_new
-import copy_reg
-copy_reg.constructor(simple_new)
-
-# Make an interface declaration for Persistent,
-# if zope.interface is available.
try:
- from zope.interface import classImplements
+ from cPickleCache import PickleCache
except ImportError:
- pass
-else:
- from persistent.interfaces import IPersistent
- classImplements(Persistent, IPersistent)
+ from picklecache import PickleCache
+
+if _HAVE_CPERSISTECE:
+ # Make an interface declaration for Persistent, if zope.interface
+ # is available. XXX that the pyPersistent version already does this?
+ try:
+ from zope.interface import classImplements
+ except ImportError:
+ pass
+ else:
+ from persistent.interfaces import IPersistent
+ classImplements(Persistent, IPersistent)
Modified: ZODB/branches/tseaver-python_picklecache/src/persistent/interfaces.py
===================================================================
--- ZODB/branches/tseaver-python_picklecache/src/persistent/interfaces.py 2009-03-19 15:34:54 UTC (rev 98273)
+++ ZODB/branches/tseaver-python_picklecache/src/persistent/interfaces.py 2009-03-19 15:36:43 UTC (rev 98274)
@@ -19,6 +19,11 @@
from zope.interface import Interface
from zope.interface import Attribute
+try:
+ from cPersistence import GHOST, UPTODATE, CHANGED, STICKY
+except ImportError:
+ GHOST, UPTODATE, CHANGED, STICKY = range(4)
+
class IPersistent(Interface):
"""Python persistent interface
@@ -306,3 +311,138 @@
## is returned. If non-None, the return value is the kind of
## timestamp supplied by Python's time.time().
## """
+
+
+class IPickleCache(Interface):
+ """ API of the cache for a ZODB connection.
+ """
+ def __getitem__(oid):
+ """ -> the persistent object for OID.
+
+ o Raise KeyError if not found.
+ """
+
+ def __setitem__(oid, value):
+ """ Save the persistent object under OID.
+
+ o 'oid' must be a string, else raise ValueError.
+
+ o Raise KeyError on duplicate
+ """
+
+ def __delitem__(oid):
+ """ Remove the persistent object for OID.
+
+ o 'oid' must be a string, else raise ValueError.
+
+ o Raise KeyError if not found.
+ """
+
+ def get(oid, default=None):
+ """ -> the persistent object for OID.
+
+ o Return 'default' if not found.
+ """
+
+ def mru(oid):
+ """ Move the element corresonding to 'oid' to the head.
+
+ o Raise KeyError if no element is found.
+ """
+
+ def __len__():
+ """ -> the number of OIDs in the cache.
+ """
+
+ def items():
+ """-> a sequence of tuples (oid, value) for cached objects.
+
+ o Only includes items in 'data' (no p-classes).
+ """
+
+ def ringlen():
+ """ -> the number of persistent objects in the ring.
+
+ o Only includes items in the ring (no ghosts or p-classes).
+ """
+
+ def lru_items():
+ """ -> a sequence of tuples (oid, value) for cached objects.
+
+ o Tuples will be in LRU order.
+
+ o Only includes items in the ring (no ghosts or p-classes).
+ """
+
+ def klass_items():
+ """-> a sequence of tuples (oid, value) for cached p-classes.
+
+ o Only includes persistent classes.
+ """
+
+ def incrgc():
+ """ Perform an incremental garbage collection sweep.
+
+ o Reduce number of non-ghosts to 'cache_size', if possible.
+
+ o Ghostify in LRU order.
+
+ o Skip dirty or sticky objects.
+
+ o Quit once we get down to 'cache_size'.
+ """
+
+ def full_sweep():
+ """ Perform a full garbage collection sweep.
+
+ o Reduce number of non-ghosts to 0, if possible.
+
+ o Ghostify all non-sticky / non-changed objecs.
+ """
+
+ def minimize():
+ """ Alias for 'full_sweep'.
+
+ o XXX?
+ """
+
+ def reify(to_reify):
+ """ Reify the indicated objects.
+
+ o If 'to_reify' is a string, treat it as an OID.
+
+ o Otherwise, iterate over it as a sequence of OIDs.
+
+ o For each OID, if present in 'data' and in GHOST state:
+
+ o Call '_p_unghostify' on the object.
+
+ o Add it to the ring.
+
+ o If any OID is present but not in GHOST state, skip it.
+
+ o Raise KeyErrory if any OID is not present.
+ """
+
+ def invalidate(to_invalidate):
+ """ Invalidate the indicated objects.
+
+ o If 'to_invalidate' is a string, treat it as an OID.
+
+ o Otherwise, iterate over it as a sequence of OIDs.
+
+ o Any OID corresponding to a p-class will cause the corresponding
+ p-class to be removed from the cache.
+
+ o For all other OIDs, ghostify the corrsponding object and
+ remove it from the ring.
+ """
+
+ cache_size = Attribute(u'Target size of the cache')
+ cache_drain_resistance = Attribute(u'Factor for draining cache below '
+ u'target size')
+ cache_non_ghost_count = Attribute(u'Number of non-ghosts in the cache '
+ u'(XXX how is it different from '
+ u'ringlen?')
+ cache_data = Attribute(u"Property: copy of our 'data' dict")
+ cache_klass_count = Attribute(u"Property: len of 'persistent_classes'")
Added: ZODB/branches/tseaver-python_picklecache/src/persistent/picklecache.py
===================================================================
--- ZODB/branches/tseaver-python_picklecache/src/persistent/picklecache.py (rev 0)
+++ ZODB/branches/tseaver-python_picklecache/src/persistent/picklecache.py 2009-03-19 15:36:43 UTC (rev 98274)
@@ -0,0 +1,225 @@
+##############################################################################
+#
+# Copyright (c) 2009 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+import weakref
+
+from zope.interface import implements
+
+from persistent.interfaces import CHANGED
+from persistent.interfaces import GHOST
+from persistent.interfaces import IPickleCache
+from persistent.interfaces import STICKY
+
+class RingNode(object):
+ # 32 byte fixed size wrapper.
+ __slots__ = ('object', 'next', 'prev')
+ def __init__(self, object, next=None, prev=None):
+ self.object = object
+ self.next = next
+ self.prev = prev
+
+class PickleCache(object):
+ implements(IPickleCache)
+
+ def __init__(self, jar, target_size):
+ self.jar = jar
+ self.target_size = target_size
+ self.drain_resistance = 0
+ self.non_ghost_count = 0
+ self.persistent_classes = {}
+ self.data = weakref.WeakValueDictionary()
+ self.ring = RingNode(None)
+ self.ring.next = self.ring.prev = self.ring
+
+ # IPickleCache API
+ def __len__(self):
+ """ See IPickleCache.
+ """
+ return (len(self.persistent_classes) +
+ len(self.data))
+
+ def __getitem__(self, oid):
+ """ See IPickleCache.
+ """
+ value = self.data.get(oid)
+ if value is not None:
+ return value
+ return self.persistent_classes[oid]
+
+ def __setitem__(self, oid, value):
+ """ See IPickleCache.
+ """
+ if not isinstance(oid, str):
+ raise ValueError('OID must be string: %s' % oid)
+ # XXX
+ if oid in self.persistent_classes or oid in self.data:
+ raise KeyError('Duplicate OID: %s' % oid)
+ if type(value) is type:
+ self.persistent_classes[oid] = value
+ else:
+ self.data[oid] = value
+ if value._p_state != GHOST:
+ self.non_ghost_count += 1
+ mru = self.ring.prev
+ self.ring.prev = node = RingNode(value, self.ring, mru)
+ mru.next = node
+
+ def __delitem__(self, oid):
+ """ See IPickleCache.
+ """
+ if not isinstance(oid, str):
+ raise ValueError('OID must be string: %s' % oid)
+ if oid in self.persistent_classes:
+ del self.persistent_classes[oid]
+ else:
+ value = self.data.pop(oid)
+ node = self.ring.next
+ if node is None:
+ return
+ while node is not self.ring:
+ if node.object is value:
+ node.prev.next, node.next.prev = node.next, node.prev
+ self.non_ghost_count -= 1
+ break
+ node = node.next
+
+ def get(self, oid, default=None):
+ """ See IPickleCache.
+ """
+ value = self.data.get(oid, self)
+ if value is not self:
+ return value
+ return self.persistent_classes.get(oid, default)
+
+ def mru(self, oid):
+ """ See IPickleCache.
+ """
+ node = self.ring.next
+ while node is not self.ring and node.object._p_oid != oid:
+ node = node.next
+ if node is self.ring:
+ raise KeyError('Unknown OID: %s' % oid)
+ # remove from old location
+ node.prev.next, node.next.prev = node.next, node.prev
+ # splice into new
+ self.ring.prev.next, node.prev = node, self.ring.prev
+ self.ring.prev, node.next = node, self.ring
+
+ def ringlen(self):
+ """ See IPickleCache.
+ """
+ result = 0
+ node = self.ring.next
+ while node is not self.ring:
+ result += 1
+ node = node.next
+ return result
+
+ def items(self):
+ """ See IPickleCache.
+ """
+ return self.data.items()
+
+ def lru_items(self):
+ """ See IPickleCache.
+ """
+ result = []
+ node = self.ring.next
+ while node is not self.ring:
+ result.append((node.object._p_oid, node.object))
+ node = node.next
+ return result
+
+ def klass_items(self):
+ """ See IPickleCache.
+ """
+ return self.persistent_classes.items()
+
+ def incrgc(self, ignored=None):
+ """ See IPickleCache.
+ """
+ target = self.target_size
+ if self.drain_resistance >= 1:
+ size = self.non_ghost_count
+ target2 = size - 1 - (size / self.drain_resistance)
+ if target2 < target:
+ target = target2
+ self._sweep(target)
+
+ def full_sweep(self, target=None):
+ """ See IPickleCache.
+ """
+ self._sweep(0)
+
+ minimize = full_sweep
+
+ def reify(self, oid):
+ """ See IPickleCache.
+ """
+ pass
+
+ def invalidate(self, to_invalidate):
+ """ See IPickleCache.
+ """
+ if isintance(to_invalidate, str):
+ self._invalidate(to_invalidate)
+ else:
+ for oid in to_invalidate:
+ self._invalidate(oid)
+
+ def debug_info(self):
+ """ See IPickleCache.
+ """
+ result = []
+ for oid, klass in self.persistent_classes.items():
+ result.append((oid,
+ len(gc.getreferents(value)),
+ type(value).__name__,
+ value._p_state,
+ ))
+ for oid, value in self.data.items():
+ result.append((oid,
+ len(gc.getreferents(value)),
+ type(value).__name__,
+ ))
+
+ cache_size = property(lambda self: self.target_size)
+ cache_drain_resistance = property(lambda self: self.drain_resistance)
+ cache_non_ghost_count = property(lambda self: self.non_ghost_count)
+ cache_data = property(lambda self: dict(self.data.items()))
+ cache_klass_count = property(lambda self: len(self.persistent_classes))
+
+ # Helpers
+ def _sweep(self, target):
+ # lock
+ node = self.ring.next
+ while node is not self.ring and self.non_ghost_count > target:
+ if node.object._p_state not in (STICKY, CHANGED):
+ node.prev.next, node.next.prev = node.next, node.prev
+ node.object = None
+ self.non_ghost_count -= 1
+ node = node.next
+
+ def _invalidate(self, oid):
+ value = self.data.get(oid)
+ if value is not None and value._p_state != GHOST:
+ # value._p_invalidate() # NOOOO, we'll do it ourselves.
+ value._p_ghostify() # TBD
+ node = self.ring.next
+ while node is not self.ring:
+ if node.object is value:
+ node.prev.next, node.next.prev = node.next, node.prev
+ break
+ elif oid in self.persistent_classes:
+ del self.persistent_classes[oid]
+
Added: ZODB/branches/tseaver-python_picklecache/src/persistent/tests/test_picklecache.py
===================================================================
--- ZODB/branches/tseaver-python_picklecache/src/persistent/tests/test_picklecache.py (rev 0)
+++ ZODB/branches/tseaver-python_picklecache/src/persistent/tests/test_picklecache.py 2009-03-19 15:36:43 UTC (rev 98274)
@@ -0,0 +1,287 @@
+##############################################################################
+#
+# Copyright (c) 2009 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+import unittest
+
+class PickleCacheTests(unittest.TestCase):
+
+ def _getTargetClass(self):
+ from persistent.picklecache import PickleCache
+ return PickleCache
+
+ def _makeOne(self, jar=None, target_size=10):
+ if jar is None:
+ jar = DummyConnection()
+ return self._getTargetClass()(jar, target_size)
+
+ def _makePersist(self, state=None, oid='foo', jar=None):
+ if state is None:
+ from persistent.interfaces import GHOST
+ state = GHOST
+ if jar is None:
+ jar = DummyConnection()
+ persist = DummyPersistent()
+ persist._p_state = state
+ persist._p_oid = oid
+ persist._p_jar = jar
+ return persist
+
+ def test_class_conforms_to_IPickleCache(self):
+ from zope.interface.verify import verifyClass
+ from persistent.interfaces import IPickleCache
+ verifyClass(IPickleCache, self._getTargetClass())
+
+ def test_instance_conforms_to_IPickleCache(self):
+ from zope.interface.verify import verifyObject
+ from persistent.interfaces import IPickleCache
+ verifyObject(IPickleCache, self._makeOne())
+
+ def test_empty(self):
+ cache = self._makeOne()
+
+ self.assertEqual(len(cache), 0)
+ self.assertEqual(len(cache.items()), 0)
+ self.assertEqual(len(cache.klass_items()), 0)
+ self.assertEqual(cache.ringlen(), 0)
+ self.assertEqual(len(cache.lru_items()), 0)
+ self.assertEqual(cache.cache_size, 10)
+ self.assertEqual(cache.cache_drain_resistance, 0)
+ self.assertEqual(cache.cache_non_ghost_count, 0)
+ self.assertEqual(dict(cache.cache_data), {})
+ self.assertEqual(cache.cache_klass_count, 0)
+
+ def test___getitem___nonesuch_raises_KeyError(self):
+ cache = self._makeOne()
+
+ self.assertRaises(KeyError, lambda: cache['nonesuch'])
+
+ def test_get_nonesuch_no_default(self):
+ cache = self._makeOne()
+
+ self.assertEqual(cache.get('nonesuch'), None)
+
+ def test_get_nonesuch_w_default(self):
+ cache = self._makeOne()
+ default = object
+
+ self.failUnless(cache.get('nonesuch', default) is default)
+
+ def test___setitem___non_string_oid_raises_ValueError(self):
+ cache = self._makeOne()
+
+ try:
+ cache[object()] = self._makePersist()
+ except ValueError:
+ pass
+ else:
+ self.fail("Didn't raise ValueError with non-string OID.")
+
+ def test___setitem___duplicate_oid_raises_KeyError(self):
+ cache = self._makeOne()
+ original = self._makePersist()
+ cache['original'] = original
+ duplicate = self._makePersist()
+
+ try:
+ cache['original'] = duplicate
+ except KeyError:
+ pass
+ else:
+ self.fail("Didn't raise KeyError with duplicate OID.")
+
+ def test___setitem___ghost(self):
+ from persistent.interfaces import GHOST
+ cache = self._makeOne()
+ ghost = self._makePersist(state=GHOST)
+
+ cache['ghost'] = ghost
+
+ self.assertEqual(len(cache), 1)
+ self.assertEqual(len(cache.items()), 1)
+ self.assertEqual(len(cache.klass_items()), 0)
+ self.assertEqual(cache.items()[0][0], 'ghost')
+ self.assertEqual(cache.ringlen(), 0)
+ self.failUnless(cache.items()[0][1] is ghost)
+ self.failUnless(cache['ghost'] is ghost)
+
+ def test___setitem___non_ghost(self):
+ from persistent.interfaces import UPTODATE
+ cache = self._makeOne()
+ uptodate = self._makePersist(state=UPTODATE)
+
+ cache['uptodate'] = uptodate
+
+ self.assertEqual(len(cache), 1)
+ self.assertEqual(len(cache.items()), 1)
+ self.assertEqual(len(cache.klass_items()), 0)
+ self.assertEqual(cache.items()[0][0], 'uptodate')
+ self.assertEqual(cache.ringlen(), 1)
+ self.failUnless(cache.items()[0][1] is uptodate)
+ self.failUnless(cache['uptodate'] is uptodate)
+ self.failUnless(cache.get('uptodate') is uptodate)
+
+ def test___setitem___persistent_class(self):
+ class pclass(object):
+ pass
+ cache = self._makeOne()
+
+ cache['pclass'] = pclass
+
+ self.assertEqual(len(cache), 1)
+ self.assertEqual(len(cache.items()), 0)
+ self.assertEqual(len(cache.klass_items()), 1)
+ self.assertEqual(cache.klass_items()[0][0], 'pclass')
+ self.failUnless(cache.klass_items()[0][1] is pclass)
+ self.failUnless(cache['pclass'] is pclass)
+ self.failUnless(cache.get('pclass') is pclass)
+
+ def test___delitem___non_string_oid_raises_ValueError(self):
+ cache = self._makeOne()
+
+ try:
+ del cache[object()]
+ except ValueError:
+ pass
+ else:
+ self.fail("Didn't raise ValueError with non-string OID.")
+
+ def test___delitem___nonesuch_raises_KeyError(self):
+ cache = self._makeOne()
+ original = self._makePersist()
+
+ try:
+ del cache['nonesuch']
+ except KeyError:
+ pass
+ else:
+ self.fail("Didn't raise KeyError with nonesuch OID.")
+
+ def test_lruitems(self):
+ from persistent.interfaces import UPTODATE
+ cache = self._makeOne()
+ cache['one'] = self._makePersist(oid='one', state=UPTODATE)
+ cache['two'] = self._makePersist(oid='two', state=UPTODATE)
+ cache['three'] = self._makePersist(oid='three', state=UPTODATE)
+
+ items = cache.lru_items()
+ self.assertEqual(len(items), 3)
+ self.assertEqual(items[0][0], 'one')
+ self.assertEqual(items[1][0], 'two')
+ self.assertEqual(items[2][0], 'three')
+
+ def test_mru_nonesuch_raises_KeyError(self):
+ cache = self._makeOne()
+
+ try:
+ cache.mru('nonesuch')
+ except KeyError:
+ pass
+ else:
+ self.fail("Didn't raise KeyError with nonesuch OID.")
+
+ def test_mru_normal(self):
+ from persistent.interfaces import UPTODATE
+ cache = self._makeOne()
+ cache['one'] = self._makePersist(oid='one', state=UPTODATE)
+ cache['two'] = self._makePersist(oid='two', state=UPTODATE)
+ cache['three'] = self._makePersist(oid='three', state=UPTODATE)
+
+ cache.mru('two')
+
+ self.assertEqual(cache.ringlen(), 3)
+ items = cache.lru_items()
+ self.assertEqual(len(items), 3)
+ self.assertEqual(items[0][0], 'one')
+ self.assertEqual(items[1][0], 'three')
+ self.assertEqual(items[2][0], 'two')
+
+ def test_mru_first(self):
+ from persistent.interfaces import UPTODATE
+ cache = self._makeOne()
+ cache['one'] = self._makePersist(oid='one', state=UPTODATE)
+ cache['two'] = self._makePersist(oid='two', state=UPTODATE)
+ cache['three'] = self._makePersist(oid='three', state=UPTODATE)
+
+ cache.mru('one')
+
+ self.assertEqual(cache.ringlen(), 3)
+ items = cache.lru_items()
+ self.assertEqual(len(items), 3)
+ self.assertEqual(items[0][0], 'two')
+ self.assertEqual(items[1][0], 'three')
+ self.assertEqual(items[2][0], 'one')
+
+ def test_mru_last(self):
+ from persistent.interfaces import UPTODATE
+ cache = self._makeOne()
+ cache['one'] = self._makePersist(oid='one', state=UPTODATE)
+ cache['two'] = self._makePersist(oid='two', state=UPTODATE)
+ cache['three'] = self._makePersist(oid='three', state=UPTODATE)
+
+ cache.mru('three')
+
+ self.assertEqual(cache.ringlen(), 3)
+ items = cache.lru_items()
+ self.assertEqual(len(items), 3)
+ self.assertEqual(items[0][0], 'one')
+ self.assertEqual(items[1][0], 'two')
+ self.assertEqual(items[2][0], 'three')
+
+ def test_incrgc_simple(self):
+ from persistent.interfaces import UPTODATE
+ cache = self._makeOne()
+ oids = []
+ for i in range(100):
+ oid = 'oid_%04d' % i
+ oids.append(oid)
+ cache[oid] = self._makePersist(oid=oid, state=UPTODATE)
+ self.assertEqual(cache.cache_non_ghost_count, 100)
+
+ cache.incrgc()
+
+ self.assertEqual(cache.cache_non_ghost_count, 10)
+ items = cache.lru_items()
+ self.assertEqual(len(items), 10)
+ self.assertEqual(items[0][0], 'oid_0090')
+ self.assertEqual(items[1][0], 'oid_0091')
+ self.assertEqual(items[2][0], 'oid_0092')
+ self.assertEqual(items[3][0], 'oid_0093')
+ self.assertEqual(items[4][0], 'oid_0094')
+ self.assertEqual(items[5][0], 'oid_0095')
+ self.assertEqual(items[6][0], 'oid_0096')
+ self.assertEqual(items[7][0], 'oid_0097')
+ self.assertEqual(items[8][0], 'oid_0098')
+ self.assertEqual(items[9][0], 'oid_0099')
+
+ for oid in oids[:90]:
+ self.failUnless(cache.get(oid) is None)
+
+ for oid in oids[90:]:
+ self.failIf(cache.get(oid) is None)
+
+
+class DummyPersistent(object):
+ pass
+
+class DummyConnection:
+
+ def setklassstate(self, obj):
+ """Method used by PickleCache."""
+
+def test_suite():
+ return unittest.TestSuite((
+ DocTestSuite(),
+ ))
+
+if __name__ == '__main__':
+ unittest.main()
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