def _setstate(self, obj):
# Helper for setstate(), which provides logging of failures.
# The control flow is complicated here to avoid loading an
# object revision that we are sure we aren't going to use. As
# a result, invalidation tests occur before and after the
# load. We can only be sure about invalidations after the
# load.
# If an object has been invalidated, there are several cases
# to consider:
# 1. Check _p_independent()
# 2. Try MVCC
# 3. Raise ConflictError.
# Does anything actually use _p_independent()? It would simplify
# the code if we could drop support for it.
# (BTrees.Length does.)
# There is a harmless data race with self._invalidated. A
# dict update could go on in another thread, but we don't care
# because we have to check again after the load anyway.
if self._invalidatedCache:
raise ReadConflictError()
if (obj._p_oid in self._invalidated
and not myhasattr(obj, "_p_independent")):
# If the object has _p_independent(), we will handle it below.
self._load_before_or_conflict(obj)
return
p, serial = self._storage.load(obj._p_oid, self._version)
self._load_count += 1
self._inv_lock.acquire()
try:
invalid = obj._p_oid in self._invalidated
finally:
self._inv_lock.release()
if invalid:
if myhasattr(obj, "_p_independent"):
# This call will raise a ReadConflictError if something
# goes wrong
self._handle_independent(obj)
else:
self._load_before_or_conflict(obj)
return
self._reader.setGhostState(obj, p)
obj._p_serial = serial
self._cache.update_object_size_estimation(obj._p_oid, len(p))
obj._p_estimated_size = len(p)
# Blob support
if isinstance(obj, Blob):
obj._p_blob_uncommitted = None
obj._p_blob_committed = self._storage.loadBlob(obj._p_oid, serial)
def _setstate(self, obj):
# Helper for setstate(), which provides logging of failures.
# The control flow is complicated here to avoid loading an
# object revision that we are sure we aren't going to use. As
# a result, invalidation tests occur before and after the
# load. We can only be sure about invalidations after the
# load.
# If an object has been invalidated, there are several cases
# to consider:
# 1. Check _p_independent()
# 2. Try MVCC
# 3. Raise ConflictError.
# Does anything actually use _p_independent()? It would simplify
# the code if we could drop support for it.
# There is a harmless data race with self._invalidated. A
# dict update could go on in another thread, but we don't care
# because we have to check again after the load anyway.
if (obj._p_oid in self._invalidated and
not myhasattr(obj, "_p_independent")):
# If the object has _p_independent(), we will handle it below.
self._load_before_or_conflict(obj)
return
p, serial = self._storage.load(obj._p_oid, self._version)
self._load_count += 1
self._inv_lock.acquire()
try:
invalid = obj._p_oid in self._invalidated
finally:
self._inv_lock.release()
if invalid:
if myhasattr(obj, "_p_independent"):
# This call will raise a ReadConflictError if something
# goes wrong
self._handle_independent(obj)
else:
self._load_before_or_conflict(obj)
return
self._reader.setGhostState(obj, p)
obj._p_serial = serial
def test_myhasattr(self):
class OldStyle:
bar = "bar"
def __getattr__(self, name):
if name == "error":
raise ValueError("whee!")
else:
raise AttributeError(name)
class NewStyle(object):
bar = "bar"
def _raise(self):
raise ValueError("whee!")
error = property(_raise)
self.assertRaises(ValueError, serialize.myhasattr, OldStyle(), "error")
self.assertRaises(ValueError, serialize.myhasattr, NewStyle(), "error")
self.assertTrue(serialize.myhasattr(OldStyle(), "bar"))
self.assertTrue(serialize.myhasattr(NewStyle(), "bar"))
self.assertTrue(not serialize.myhasattr(OldStyle(), "rat"))
self.assertTrue(not serialize.myhasattr(NewStyle(), "rat"))
def test_myhasattr(self):
class OldStyle(object):
bar = "bar"
def __getattr__(self, name):
if name == "error":
raise ValueError("whee!")
else:
raise AttributeError(name)
class NewStyle(object):
bar = "bar"
def _raise(self):
raise ValueError("whee!")
error = property(_raise)
self.assertRaises(ValueError,
serialize.myhasattr, OldStyle(), "error")
self.assertRaises(ValueError,
serialize.myhasattr, NewStyle(), "error")
self.assertTrue(serialize.myhasattr(OldStyle(), "bar"))
self.assertTrue(serialize.myhasattr(NewStyle(), "bar"))
self.assertTrue(not serialize.myhasattr(OldStyle(), "rat"))
self.assertTrue(not serialize.myhasattr(NewStyle(), "rat"))
