Lib.test.test_finalizers.py Maven / Gradle / Ivy
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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
'''
Created on 06.08.2014
'''
import unittest
import types
import time
try:
from java.lang import System
except:
pass
class GCDetector():
gcIndex = 0
def __del__(self):
GCDetector.gcIndex += 1
maxGCRun = 10
def runGCIfJython():
try:
currentIndex = GCDetector.gcIndex
gcCount = 0
detector = GCDetector()
detector = None
while currentIndex == GCDetector.gcIndex and gcCount < maxGCRun:
System.gc()
gcCount += 1
time.sleep(0.1)
except:
pass
finalizeMsgList = []
verbose = False
resurrectedObject_I = None
resurrectedObject_J = None
resurrectedObject_K = None
resurrectedObject_L = None
resurrectedObject_M = None
resurrectedObject_N = None
class ResurrectableDummyClass():
def __init__(self, name):
self.name = name
self.doResurrection = True
def __str__(self):
return self.name
class ResurrectableDummyClassNew(object):
def __init__(self, name):
self.name = name
self.doResurrection = True
def __str__(self):
return self.name
def __del__I(self):
global resurrectedObject_I
finalizeMsgList.append(str(self)+" finalized (ResurrectableDummyClass)")
if verbose:
print str(self)+" finalized (ResurrectableDummyClass)"
if self.doResurrection:
resurrectedObject_I = self
def __del__J(self):
global resurrectedObject_J
finalizeMsgList.append(str(self)+" finalized (ResurrectableDummyClass)")
if verbose:
print str(self)+" finalized (ResurrectableDummyClass)"
if self.doResurrection:
resurrectedObject_J = self
def __del__K(self):
global resurrectedObject_K
finalizeMsgList.append(str(self)+" finalized (ResurrectableDummyClass)")
if verbose:
print str(self)+" finalized (ResurrectableDummyClass)"
if self.doResurrection:
resurrectedObject_K = self
def __del__L(self):
global resurrectedObject_L
finalizeMsgList.append(str(self)+" finalized (ResurrectableDummyClass)")
if verbose:
print str(self)+" finalized (ResurrectableDummyClass)"
if self.doResurrection:
resurrectedObject_L = self
def __del__M(self):
global resurrectedObject_M
finalizeMsgList.append(str(self)+" finalized (ResurrectableDummyClass)")
if verbose:
print str(self)+" finalized (ResurrectableDummyClass)"
if self.doResurrection:
resurrectedObject_M = self
def __del__N(self):
global resurrectedObject_N
finalizeMsgList.append(str(self)+" finalized (ResurrectableDummyClass)")
if verbose:
print str(self)+" finalized (ResurrectableDummyClass)"
if self.doResurrection:
resurrectedObject_N = self
delI = __del__I
delJ = __del__J
delK = __del__K
delL = __del__L
delM = __del__M
delN = __del__N
class DummyClass():
def __init__(self, name):
self.name = name
def __str__(self):
return self.name
class DummyClassDel():
def __init__(self, name):
self.name = name
def __str__(self):
return self.name
def __del__(self):
finalizeMsgList.append(str(self)+" finalized (DummyClassDel)")
if verbose:
print str(self)+" finalized (DummyClassDel)"
class DummyClassNew(object):
def __init__(self, name):
self.name = name
def __str__(self):
return self.name
class DummyClassDelNew(object):
def __init__(self, name):
self.name = name
def __str__(self):
return self.name
def __del__(self):
finalizeMsgList.append(str(self)+" finalized (DummyClassDelNew)")
if verbose:
print str(self)+" finalized (DummyClassDelNew)"
class DummyFileClassNew(file):
def __init__(self, name):
self.name0 = name
def __str__(self):
return self.name0
def __del__(self):
finalizeMsgList.append(str(self)+" finalized (DummyFileClassNew)")
if verbose:
print str(self)+" finalized (DummyFileClassNew)"
def __del__class(self):
finalizeMsgList.append(str(self)+" finalized (acquired by class)")
if verbose:
print str(self)+" finalized (acquired by class)"
def __del__object(self):
finalizeMsgList.append(str(self)+" finalized (acquired by object)")
if verbose:
print str(self)+" finalized (acquired by object)"
def __del__object0():
finalizeMsgList.append("_ finalized (acquired by object)")
if verbose:
print "_ finalized (acquired by object)"
delClass = __del__class
delObject = __del__object
delObject0 = __del__object0
class TestFinalizers(unittest.TestCase):
def test_finalizer_builtin_oldStyleClass(self):
A = DummyClassDel("A")
A = None
runGCIfJython()
self.assertIn("A finalized (DummyClassDel)", finalizeMsgList)
def test_classAcquiresFinalizer_beforeInstanciation_oldStyleClass(self):
DummyClass.__del__ = delClass
B = DummyClass("B")
B = None
runGCIfJython()
self.assertIn("B finalized (acquired by class)", finalizeMsgList)
del DummyClass.__del__
def test_classAcquiresFinalizer_afterInstanciation_oldStyleClass(self):
#okay to fail in Jython without the manual __ensure_finalizer__ call
C = DummyClass("C")
DummyClass.__del__ = delClass
try:
C.__ensure_finalizer__()
except:
pass
C = None
runGCIfJython()
self.assertIn("C finalized (acquired by class)", finalizeMsgList)
del DummyClass.__del__
def test_instanceAcquiresFinalizer_bound_oldStyleClass(self):
D = DummyClassDel("D")
dl = types.MethodType(delObject, D.name)
D.__del__ = dl
D = None
runGCIfJython()
self.assertNotIn("D finalized (DummyClassDel)", finalizeMsgList)
self.assertIn("D finalized (acquired by object)", finalizeMsgList)
def test_finalizer_builtin_newStyleClass(self):
E = DummyClassDelNew("E")
E = None
runGCIfJython()
self.assertIn("E finalized (DummyClassDelNew)", finalizeMsgList)
def test_classAcquiresFinalizer_beforeInstanciation_newStyleClass(self):
DummyClassNew.__del__ = delClass
F = DummyClassNew("F")
F = None
runGCIfJython()
self.assertIn("F finalized (acquired by class)", finalizeMsgList)
del DummyClassNew.__del__
def test_classAcquiresFinalizer_afterInstanciation_newStyleClass(self):
#okay to fail in Jython without the manual __ensure_finalizer__ call
G = DummyClassNew("G")
DummyClassNew.__del__ = delClass
try:
G.__ensure_finalizer__()
except:
pass
G = None
runGCIfJython()
self.assertIn("G finalized (acquired by class)", finalizeMsgList)
del DummyClassNew.__del__
def test_instanceAcquiresFinalizer_bound_newStyleClass(self):
"""
It seems, CPython prohibits new style instances from acquiring a finalizer.
"""
H = DummyClassDelNew("H")
H.__del__ = types.MethodType(delObject, H.name)
H = None
runGCIfJython()
self.assertIn("H finalized (DummyClassDelNew)", finalizeMsgList)
self.assertNotIn("H finalized (acquired by object)", finalizeMsgList)
def test_instanceAcquiresFinalizer_bound_newStyleClass2(self):
"""
In CPython, new style instances can't acquire a finalizer.
If one calls the instance-acquired __del__ manually, it works, but the gc
will still call the old one.
"""
H = DummyClassDelNew("H2")
H.__del__ = types.MethodType(delObject, H.name)
H.__del__()
H = None
runGCIfJython()
self.assertIn("H2 finalized (DummyClassDelNew)", finalizeMsgList)
self.assertIn("H2 finalized (acquired by object)", finalizeMsgList)
def test_objectResurrection_oldStyleClass(self):
ResurrectableDummyClass.__del__ = delI
I = ResurrectableDummyClass("I")
I = None
runGCIfJython()
self.assertIn("I finalized (ResurrectableDummyClass)", finalizeMsgList)
self.assertEqual(str(resurrectedObject_I), "I")
def test_objectDoubleResurrection_oldStyleClass(self):
#okay to fail in Jython without the manual ensureFinalizer calls
ResurrectableDummyClass.__del__ = delJ
J = ResurrectableDummyClass("J")
J = None
runGCIfJython()
self.assertIn("J finalized (ResurrectableDummyClass)", finalizeMsgList)
global resurrectedObject_J
self.assertEqual(str(resurrectedObject_J), "J")
J = resurrectedObject_J
resurrectedObject_J = None
self.assertIsNone(resurrectedObject_J)
try:
#For Jython one can restore the finalizer manually.
#This is offered as an easy fix if the CPython behavior
#in this test should be needed for some reason.
J.__ensure_finalizer__()
except:
pass
J = None
runGCIfJython()
self.assertEqual(str(resurrectedObject_J), "J")
resurrectedObject_J.doResurrection = False
try:
#again...
resurrectedObject_J.__ensure_finalizer__()
except:
pass
resurrectedObject_J = None
runGCIfJython()
self.assertIsNone(resurrectedObject_J)
def test_objectDoubleResurrectionAndFinalize_oldStyleClass(self):
#okay to fail in Jython without the manual __ensure_finalizer__ calls
ResurrectableDummyClass.__del__ = delK
K = ResurrectableDummyClass("K")
K = None
runGCIfJython()
self.assertIn("K finalized (ResurrectableDummyClass)", finalizeMsgList)
finalizeMsgList.remove("K finalized (ResurrectableDummyClass)")
self.assertNotIn("K finalized (ResurrectableDummyClass)", finalizeMsgList)
global resurrectedObject_K
self.assertEqual(str(resurrectedObject_K), "K")
K = resurrectedObject_K
resurrectedObject_K = None
self.assertIsNone(resurrectedObject_K)
try:
K.__ensure_finalizer__()
except:
pass
K = None
runGCIfJython()
self.assertIn("K finalized (ResurrectableDummyClass)", finalizeMsgList)
self.assertEqual(str(resurrectedObject_K), "K")
def test_objectResurrection_newStyleClass(self):
ResurrectableDummyClassNew.__del__ = delL
L = ResurrectableDummyClassNew("L")
L = None
runGCIfJython()
self.assertIn("L finalized (ResurrectableDummyClass)", finalizeMsgList)
self.assertEqual(str(resurrectedObject_L), "L")
def test_objectDoubleResurrection_newStyleClass(self):
#okay to fail in Jython without the manual __ensure_finalizer__ calls
ResurrectableDummyClassNew.__del__ = delM
M = ResurrectableDummyClassNew("M")
M = None
runGCIfJython()
self.assertIn("M finalized (ResurrectableDummyClass)", finalizeMsgList)
global resurrectedObject_M
self.assertEqual(str(resurrectedObject_M), "M")
M = resurrectedObject_M
resurrectedObject_M = None
self.assertIsNone(resurrectedObject_M, None)
try:
M.__ensure_finalizer__()
except:
pass
M = None
runGCIfJython()
self.assertEqual(str(resurrectedObject_M), "M")
def test_objectDoubleResurrectionAndFinalize_newStyleClass(self):
#okay to fail in Jython without the manual __ensure_finalizer__ calls
ResurrectableDummyClassNew.__del__ = delN
N = ResurrectableDummyClassNew("N")
N = None
runGCIfJython()
self.assertIn("N finalized (ResurrectableDummyClass)", finalizeMsgList)
finalizeMsgList.remove("N finalized (ResurrectableDummyClass)")
self.assertNotIn("N finalized (ResurrectableDummyClass)", finalizeMsgList)
global resurrectedObject_N
self.assertEqual(str(resurrectedObject_N), "N")
N = resurrectedObject_N
resurrectedObject_N = None
self.assertIsNone(resurrectedObject_N)
try:
N.__ensure_finalizer__()
except:
pass
N = None
runGCIfJython()
self.assertIn("N finalized (ResurrectableDummyClass)", finalizeMsgList)
self.assertEqual(str(resurrectedObject_N), "N")
def test_file_overwrite_del(self):
O = DummyFileClassNew("O")
O = None
runGCIfJython()
self.assertIn("O finalized (DummyFileClassNew)", finalizeMsgList)
if __name__ == '__main__':
unittest.main()