def __init__(self):
super(ReadOnlyTransaction, self).__init__()
self.map = IdentityMap()
self._clean_objects = set()
self._clean_queue = []
self._limit = -1
self._precious_objects = set()
def __init__(self):
super(ReadOnlyTransaction, self).__init__()
self.map = IdentityMap()
self._clean_objects = set()
self._clean_queue = []
self._limit = -1
self._precious_objects = set()
class ReadOnlyTransaction(object):
"""A read only unit of work for data objects."""
def finish(self):
"""Clean up this transaction."""
def __init__(self):
super(ReadOnlyTransaction, self).__init__()
self.map = IdentityMap()
self._clean_objects = set()
self._clean_queue = []
self._limit = -1
self._precious_objects = set()
def is_clean(self, an_object):
"""Return True if an_object is clean."""
return (an_object in self._clean_objects)
def register_clean(self, an_object, precious=False):
"""Register an_object as being clean.
If the precious hint is True, the object will not
be ejected from the object identity map ever.
"""
self._clean_objects.add(an_object)
self._clean_queue.append(an_object)
if precious:
self._precious_objects.add(an_object)
self._trim()
def register_dirty(self, an_object):
"""Register an_object as being dirty."""
raise errors.ReadOnlyObjectDirtiedError(an_object)
def set_cache_size(self, size):
"""Set a new cache size."""
if size < -1:
raise ValueError(size)
self._limit = size
self._trim()
def _trim(self):
"""Trim the cache back if needed."""
if self._limit < 0 or self._limit - len(self._clean_objects) > 0:
return
needed = len(self._clean_objects) - self._limit
offset = 0
while needed and offset < len(self._clean_objects):
# references we know of:
# temp passed to getrefcount in our frame
# temp in getrefcount's frame
# the map forward
# the map backwards
# _clean_objects
# _clean_queue
# 1 missing ?
if (sys.getrefcount(self._clean_queue[offset]) <= 7 and
not self._clean_queue[offset] in self._precious_objects):
removed = self._clean_queue[offset]
self._clean_objects.remove(removed)
del self._clean_queue[offset]
self.map.remove_object(removed)
mutter('removed object %r', removed)
needed -= 1
else:
offset += 1
def writeable(self):
"""Read only transactions do not allow writes."""
class ReadOnlyTransaction(object):
"""A read only unit of work for data objects."""
def finish(self):
"""Clean up this transaction."""
def __init__(self):
super(ReadOnlyTransaction, self).__init__()
self.map = IdentityMap()
self._clean_objects = set()
self._clean_queue = []
self._limit = -1
self._precious_objects = set()
def is_clean(self, an_object):
"""Return True if an_object is clean."""
return an_object in self._clean_objects
def register_clean(self, an_object, precious=False):
"""Register an_object as being clean.
If the precious hint is True, the object will not
be ejected from the object identity map ever.
"""
self._clean_objects.add(an_object)
self._clean_queue.append(an_object)
if precious:
self._precious_objects.add(an_object)
self._trim()
def register_dirty(self, an_object):
"""Register an_object as being dirty."""
raise errors.ReadOnlyObjectDirtiedError(an_object)
def set_cache_size(self, size):
"""Set a new cache size."""
if size < -1:
raise ValueError(size)
self._limit = size
self._trim()
def _trim(self):
"""Trim the cache back if needed."""
if self._limit < 0 or self._limit - len(self._clean_objects) > 0:
return
needed = len(self._clean_objects) - self._limit
offset = 0
while needed and offset < len(self._clean_objects):
# references we know of:
# temp passed to getrefcount in our frame
# temp in getrefcount's frame
# the map forward
# the map backwards
# _clean_objects
# _clean_queue
# 1 missing ?
if (
sys.getrefcount(self._clean_queue[offset]) <= 7
and not self._clean_queue[offset] in self._precious_objects
):
removed = self._clean_queue[offset]
self._clean_objects.remove(removed)
del self._clean_queue[offset]
self.map.remove_object(removed)
mutter("removed object %r", removed)
needed -= 1
else:
offset += 1
def writeable(self):
"""Read only transactions do not allow writes."""
