diff -r 8d7c2fd2ac66 -r 541659c39f6a hooks/security.py
--- a/hooks/security.py	Sat Oct 09 00:05:49 2010 +0200
+++ b/hooks/security.py	Sat Oct 09 00:05:50 2010 +0200
@@ -45,23 +45,20 @@
             rdef.check_perm(session, 'update', eid=eid)
 
 
-class _CheckEntityPermissionOp(hook.LateOperation):
+class CheckEntityPermissionOp(hook.DataOperationMixIn, hook.LateOperation):
     def precommit_event(self):
-        #print 'CheckEntityPermissionOp', self.session.user, self.entity, self.action
         session = self.session
-        for values in session.transaction_data.pop('check_entity_perm_op'):
-            eid, action, edited = values
+        for eid, action, edited in self.get_data():
             entity = session.entity_from_eid(eid)
             entity.cw_check_perm(action)
             check_entity_attributes(session, entity, edited,
-                                    creation=self.creation)
+                                    creation=(action == 'add'))
 
 
-class _CheckRelationPermissionOp(hook.LateOperation):
+class CheckRelationPermissionOp(hook.DataOperationMixIn, hook.LateOperation):
     def precommit_event(self):
         session = self.session
-        for args in session.transaction_data.pop('check_relation_perm_op'):
-            action, rschema, eidfrom, eidto = args
+        for action, rschema, eidfrom, eidto in self.get_data():
             rdef = rschema.rdef(session.describe(eidfrom)[0],
                                 session.describe(eidto)[0])
             rdef.check_perm(session, action, fromeid=eidfrom, toeid=eidto)
@@ -85,9 +82,8 @@
     events = ('after_add_entity',)
 
     def __call__(self):
-        hook.set_operation(self._cw, 'check_entity_perm_op',
-                           (self.entity.eid, 'add', self.entity.cw_edited),
-                           _CheckEntityPermissionOp, creation=True)
+        CheckEntityPermissionOp.get_instance(self._cw).add_data(
+            (self.entity.eid, 'add', self.entity.cw_edited) )
 
 
 class AfterUpdateEntitySecurityHook(SecurityHook):
@@ -104,9 +100,8 @@
             # save back editedattrs in case the entity is reedited later in the
             # same transaction, which will lead to cw_edited being
             # overwritten
-            hook.set_operation(self._cw, 'check_entity_perm_op',
-                               (self.entity.eid, 'update', self.entity.cw_edited),
-                               _CheckEntityPermissionOp, creation=False)
+            CheckEntityPermissionOp.get_instance(self._cw).add_data(
+                (self.entity.eid, 'update', self.entity.cw_edited) )
 
 
 class BeforeDelEntitySecurityHook(SecurityHook):
@@ -143,9 +138,8 @@
                 return
             rschema = self._cw.repo.schema[self.rtype]
             if self.rtype in ON_COMMIT_ADD_RELATIONS:
-                hook.set_operation(self._cw, 'check_relation_perm_op',
-                                   ('add', rschema, self.eidfrom, self.eidto),
-                                   _CheckRelationPermissionOp)
+                CheckRelationPermissionOp.get_instance(self._cw).add_data(
+                    ('add', rschema, self.eidfrom, self.eidto) )
             else:
                 rdef = rschema.rdef(self._cw.describe(self.eidfrom)[0],
                                     self._cw.describe(self.eidto)[0])