Bugs item #3016673, was opened at 2010-06-15 15:17
Message generated for change (Tracker Item Submitted) made by gendrop
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Category: WebKit
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Patrick Gendron (gendrop)
Assigned to: Nobody/Anonymous (nobody)
Summary: Class cache fails using servlet inheritance
Initial Comment:
The following code will fail:
Root.py:
from WebKit.Page import Page
class Root (Page):
def writeHTML (self):
Page.writeHTML (self)
A.py:
from Root import Root
class A (Root):
def writeHTML (self):
#assert (isinstance(self,Root))
Root.writeHTML (self)
B.py:
from A import A
class B (A):
def writeHTML (self):
A.writeHTML (self)
when successively calling servlets B -> Root -> A -> B after a fresh AppServer
restart:
TypeError: unbound method writeHTML() must be called with Root instance as
first argument (got B instance instead)
This seems to be caused by parents of B not being inserted into the cache on
the first call to this servlet. Inspection of objects reveal that servlet A
exists under two different ids during these calls. Indeed, on the second call
to B, isinstance(self, Root) returns False in the writeHTML of class A.
Turning off the class cache bypasses this problem.
Can the cache mechanism be fixed to account for this particular situation?
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