diff options
Diffstat (limited to 'lib/sqlalchemy/event/attr.py')
| -rw-r--r-- | lib/sqlalchemy/event/attr.py | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/lib/sqlalchemy/event/attr.py b/lib/sqlalchemy/event/attr.py index 7641b595a..dba1063cf 100644 --- a/lib/sqlalchemy/event/attr.py +++ b/lib/sqlalchemy/event/attr.py @@ -37,6 +37,7 @@ from . import registry from . import legacy from itertools import chain import weakref +import collections class RefCollection(object): @@ -96,8 +97,8 @@ class _DispatchDescriptor(RefCollection): self.update_subclass(cls) else: if cls not in self._clslevel: - self._clslevel[cls] = [] - self._clslevel[cls].insert(0, event_key._listen_fn) + self._clslevel[cls] = collections.deque() + self._clslevel[cls].appendleft(event_key._listen_fn) registry._stored_in_collection(event_key, self) def append(self, event_key, propagate): @@ -113,13 +114,13 @@ class _DispatchDescriptor(RefCollection): self.update_subclass(cls) else: if cls not in self._clslevel: - self._clslevel[cls] = [] + self._clslevel[cls] = collections.deque() self._clslevel[cls].append(event_key._listen_fn) registry._stored_in_collection(event_key, self) def update_subclass(self, target): if target not in self._clslevel: - self._clslevel[target] = [] + self._clslevel[target] = collections.deque() clslevel = self._clslevel[target] for cls in target.__mro__[1:]: if cls in self._clslevel: @@ -145,7 +146,7 @@ class _DispatchDescriptor(RefCollection): to_clear = set() for dispatcher in self._clslevel.values(): to_clear.update(dispatcher) - dispatcher[:] = [] + dispatcher.clear() registry._clear(self, to_clear) def for_modify(self, obj): @@ -287,7 +288,7 @@ class _ListenerCollection(RefCollection, _CompoundListener): self.parent_listeners = parent._clslevel[target_cls] self.parent = parent self.name = parent.__name__ - self.listeners = [] + self.listeners = collections.deque() self.propagate = set() def for_modify(self, obj): @@ -337,7 +338,7 @@ class _ListenerCollection(RefCollection, _CompoundListener): def clear(self): registry._clear(self, self.listeners) self.propagate.clear() - self.listeners[:] = [] + self.listeners.clear() class _JoinedDispatchDescriptor(object): |