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#!/usr/bin/env python
import vtk
class TerminationCrashTestCase:
"""This test case should produce a crash on termination if we aren't
careful in DECREFing a Python callback via vtkPythonCommand.
The problem occurs only when you have an uncollectable reference
cycle with an observer callback. This should cause a crash upon
termination (trying to delete python object after interpreter
shutdown), or an assertion error if the observed event is
'DeleteEvent' or 'AnyEvent' (trying to invoke python method after
interpreter shutdown). The test case basically consists of a python
class which contains a vtk object which is being observed by that
same class. There is no error if the event handler is a member of a
different class, even if the instance of that class is contained by
the same python object which contains the vtk object. There is also
no error if a vtk object is subclassed in python and that subclass
has an event handler for itself (self.AddObserver(Event,
self.Handler)). Finally, the problem disappears if the container
class has a cyclic reference to itself (self.CyclicReference =
self). """
def __init__(self) :
self.Object = vtk.vtkObject()
self.Object.AddObserver('StartEvent', self.Handler)
def Handler(self, obj, evt) :
print('event received')
test = TerminationCrashTestCase()
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