/usr/share/pyshared/ZODB/tests/dangle.py is in python-zodb 1:3.9.7-2.
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#
# Copyright (c) 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
#
##############################################################################
"""Functional test to produce a dangling reference."""
import time
import transaction
from ZODB.FileStorage import FileStorage
from ZODB import DB
from persistent import Persistent
class P(Persistent):
pass
def create_dangling_ref(db):
rt = db.open().root()
rt[1] = o1 = P()
transaction.get().note("create o1")
transaction.commit()
rt[2] = o2 = P()
transaction.get().note("create o2")
transaction.commit()
c = o1.child = P()
transaction.get().note("set child on o1")
transaction.commit()
o1.child = P()
transaction.get().note("replace child on o1")
transaction.commit()
time.sleep(2)
# The pack should remove the reference to c, because it is no
# longer referenced from o1. But the object still exists and has
# an oid, so a new commit of it won't create a new object.
db.pack()
print repr(c._p_oid)
o2.child = c
transaction.get().note("set child on o2")
transaction.commit()
def main():
fs = FileStorage("dangle.fs")
db = DB(fs)
create_dangling_ref(db)
db.close()
if __name__ == "__main__":
main()
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