Major refactoring of django.dispatch with an eye towards speed. The net result is that signals are up to 90% faster.

Though some attempts and backwards-compatibility were made, speed trumped compatibility. Thus, as usual, check BackwardsIncompatibleChanges for the complete list of backwards-incompatible changes.

Thanks to Jeremy Dunck and Keith Busell for the bulk of the work; some ideas from Brian Herring's previous work (refs #4561) were incorporated.

Documentation is, sigh, still forthcoming.

Fixes #6814 and #3951 (with the new dispatch_uid argument to connect).


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8223 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/query.py

@@ -7,7 +7,6 @@ from django.db import connection, transaction, IntegrityError
 from django.db.models.fields import DateField
 from django.db.models.query_utils import Q, select_related_descend
 from django.db.models import signals, sql
-from django.dispatch import dispatcher
 from django.utils.datastructures import SortedDict
 
 
@@ -810,8 +809,7 @@ def delete_objects(seen_objs):
 
         # Pre-notify all instances to be deleted.
         for pk_val, instance in items:
-            dispatcher.send(signal=signals.pre_delete, sender=cls,
-                    instance=instance)
+            signals.pre_delete.send(sender=cls, instance=instance)
 
         pk_list = [pk for pk,instance in items]
         del_query = sql.DeleteQuery(cls, connection)
@@ -845,8 +843,7 @@ def delete_objects(seen_objs):
                 if field.rel and field.null and field.rel.to in seen_objs:
                     setattr(instance, field.attname, None)
 
-            dispatcher.send(signal=signals.post_delete, sender=cls,
-                    instance=instance)
+            signals.post_delete.send(sender=cls, instance=instance)
             setattr(instance, cls._meta.pk.attname, None)
 
     transaction.commit_unless_managed()