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#!/usr/bin/env python
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
'''The BlackBox class has cases of ownership transference between C++ and Python.'''
import gc
import os
import sys
import unittest
from pathlib import Path
sys.path.append(os.fspath(Path(__file__).resolve().parents[1]))
from shiboken_paths import init_paths
init_paths()
from sample import ObjectType, BlackBox
class BlackBoxTest(unittest.TestCase):
'''The BlackBox class has cases of ownership transference between C++ and Python.'''
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testOwnershipTransference(self):
'''Ownership transference from Python to C++ and back again.'''
o1 = ObjectType()
o1.setObjectName('object1')
o1_refcnt = sys.getrefcount(o1)
o2 = ObjectType()
o2.setObjectName('object2')
o2_refcnt = sys.getrefcount(o2)
bb = BlackBox()
o1_ticket = bb.keepObjectType(o1) # noqa: F841
o2_ticket = bb.keepObjectType(o2)
self.assertEqual(set(bb.objects()), set([o1, o2]))
self.assertEqual(str(o1.objectName()), 'object1')
self.assertEqual(str(o2.objectName()), 'object2')
# PySide give +1 ref to object with c++ ownership
self.assertEqual(sys.getrefcount(o1), o1_refcnt + 1)
self.assertEqual(sys.getrefcount(o2), o2_refcnt + 1)
o2 = bb.retrieveObjectType(o2_ticket)
self.assertEqual(sys.getrefcount(o2), o2_refcnt)
del bb
# PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
gc.collect()
self.assertRaises(RuntimeError, o1.objectName)
self.assertEqual(str(o2.objectName()), 'object2')
self.assertEqual(sys.getrefcount(o2), o2_refcnt)
def testBlackBoxReleasingUnknownObjectType(self):
'''Asks BlackBox to release an unknown ObjectType.'''
o1 = ObjectType()
o2 = ObjectType() # noqa: F841
bb = BlackBox()
o1_ticket = bb.keepObjectType(o1) # noqa: F841
o3 = bb.retrieveObjectType(-5)
self.assertEqual(o3, None)
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testOwnershipTransferenceCppCreated(self):
'''Ownership transference using a C++ created object.'''
o1 = ObjectType.create()
o1.setObjectName('object1')
o1_refcnt = sys.getrefcount(o1) # noqa: F841
bb = BlackBox()
o1_ticket = bb.keepObjectType(o1) # noqa: F841
self.assertRaises(RuntimeError, o1.objectName)
if __name__ == '__main__':
unittest.main()
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