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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
import os
import shutil
import tempfile
import threading
import unittest
from traits.api import HasTraits, on_trait_change, Bool, Float, List
from traits import trait_notifiers
from traits.util.event_tracer import (
ChangeEventRecorder,
MultiThreadChangeEventRecorder,
MultiThreadRecordContainer,
RecordContainer,
record_events,
)
class ExampleObject(HasTraits):
number = Float(2.0)
list_of_numbers = List(Float())
flag = Bool
@on_trait_change("number")
def _add_number_to_list(self, value):
self.list_of_numbers.append(value)
def add_to_number(self, value):
self.number += value
class TestRecordEvents(unittest.TestCase):
def setUp(self):
self.directory = tempfile.mkdtemp()
def tearDown(self):
shutil.rmtree(self.directory)
def test_change_event_recorder(self):
test_object = ExampleObject()
container = RecordContainer()
recorder = ChangeEventRecorder(container=container)
trait_notifiers.set_change_event_tracers(
pre_tracer=recorder.pre_tracer, post_tracer=recorder.post_tracer
)
try:
test_object.number = 5.0
finally:
trait_notifiers.clear_change_event_tracers()
filename = os.path.join(self.directory, "MainThread.trace")
container.save_to_file(filename)
with open(filename, "r", encoding="utf-8") as handle:
lines = handle.readlines()
self.assertEqual(len(lines), 4)
# very basic checking
self.assertTrue(
"-> 'number' changed from 2.0 to 5.0 in 'ExampleObject'\n"
in lines[0]
)
self.assertTrue("CALLING" in lines[1])
self.assertTrue("EXIT" in lines[2])
def test_multi_thread_change_event_recorder(self):
test_object = ExampleObject()
container = MultiThreadRecordContainer()
recorder = MultiThreadChangeEventRecorder(container=container)
trait_notifiers.set_change_event_tracers(
pre_tracer=recorder.pre_tracer, post_tracer=recorder.post_tracer
)
try:
test_object.number = 5.0
thread = threading.Thread(
target=test_object.add_to_number, args=(5,)
)
thread.start()
thread.join()
finally:
trait_notifiers.clear_change_event_tracers()
self.assertEqual(len(container._record_containers), 2)
# save records
container.save_to_directory(self.directory)
for name in container._record_containers:
filename = os.path.join(self.directory, "{0}.trace".format(name))
with open(filename, "r", encoding="utf-8") as handle:
lines = handle.readlines()
self.assertEqual(len(lines), 4)
# very basic checking
if "MainThread.trace" in filename:
self.assertTrue(
"-> 'number' changed from 2.0 to 5.0 in 'ExampleObject'\n"
in lines[0]
)
else:
self.assertTrue(
"-> 'number' changed from 5.0 to 10.0 in 'ExampleObject'\n"
in lines[0]
)
self.assertTrue("CALLING" in lines[1])
self.assertTrue("EXIT" in lines[2])
def test_record_events(self):
test_object = ExampleObject()
with record_events() as container:
test_object.number = 5.0
thread = threading.Thread(
target=test_object.add_to_number, args=(3,)
)
thread.start()
thread.join()
# save records
container.save_to_directory(self.directory)
for name in container._record_containers:
filename = os.path.join(self.directory, "{0}.trace".format(name))
with open(filename, "r", encoding="utf-8") as handle:
lines = handle.readlines()
self.assertEqual(len(lines), 4)
# very basic checking
if "MainThread.trace" in filename:
self.assertTrue(
"-> 'number' changed from 2.0 to 5.0 in 'ExampleObject'\n"
in lines[0]
)
else:
self.assertTrue(
"-> 'number' changed from 5.0 to 8.0 in 'ExampleObject'\n"
in lines[0]
)
self.assertTrue("CALLING" in lines[1])
self.assertTrue("EXIT" in lines[2])
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