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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
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
from sample import ObjectView
from sample import ObjectModel
class ObjTest(unittest.TestCase):
def test_cyclic_dependency_withParent(self):
"""Create 2 objects with a cyclic dependency, so that they can
only be removed by the garbage collector, and then invoke the
garbage collector in a different thread.
"""
class CyclicChildObject(ObjectType):
def __init__(self, parent):
super(CyclicChildObject, self).__init__(parent)
self._parent = parent
class CyclicObject(ObjectType):
def __init__(self):
super(CyclicObject, self).__init__()
CyclicChildObject(self)
# turn off automatic garbage collection, to be able to trigger it
# at the 'right' time
gc.disable()
alive = lambda: sum(isinstance(o, CyclicObject) for o in gc.get_objects()) # noqa: E731
#
# first proof that the wizard is only destructed by the garbage
# collector
#
cycle = CyclicObject()
self.assertTrue(alive())
del cycle
if not hasattr(sys, "pypy_version_info"):
# PYSIDE-535: the semantics of gc.enable/gc.disable is different for PyPy
self.assertTrue(alive())
gc.collect()
self.assertFalse(alive())
def test_cyclic_dependency_withKeepRef(self):
"""Create 2 objects with a cyclic dependency, so that they can
only be removed by the garbage collector, and then invoke the
garbage collector in a different thread.
"""
class CyclicChildObject(ObjectView):
def __init__(self, model):
super(CyclicChildObject, self).__init__(None)
self.setModel(model)
class CyclicObject(ObjectModel):
def __init__(self):
super(CyclicObject, self).__init__()
self._view = CyclicChildObject(self)
# turn off automatic garbage collection, to be able to trigger it
# at the 'right' time
gc.disable()
alive = lambda: sum(isinstance(o, CyclicObject) for o in gc.get_objects()) # noqa: E731
#
# first proof that the wizard is only destructed by the garbage
# collector
#
cycle = CyclicObject()
self.assertTrue(alive())
del cycle
if not hasattr(sys, "pypy_version_info"):
# PYSIDE-535: the semantics of gc.enable/gc.disable is different for PyPy
self.assertTrue(alive())
gc.collect()
self.assertFalse(alive())
if __name__ == '__main__':
unittest.main()
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