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# Copyright (C) 2011, 2016 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import threading
from bzrlib import (
cethread,
tests,
)
class TestCatchingExceptionThread(tests.TestCase):
def test_start_and_join_smoke_test(self):
def do_nothing():
pass
tt = cethread.CatchingExceptionThread(target=do_nothing)
tt.start()
tt.join()
def test_exception_is_re_raised(self):
class MyException(Exception):
pass
def raise_my_exception():
raise MyException()
tt = cethread.CatchingExceptionThread(target=raise_my_exception)
tt.start()
self.assertRaises(MyException, tt.join)
def test_join_around_exception(self):
resume = threading.Event()
class MyException(Exception):
pass
def raise_my_exception():
# Wait for the test to tell us to resume
resume.wait()
# Now we can raise
raise MyException()
tt = cethread.CatchingExceptionThread(target=raise_my_exception)
tt.start()
tt.join(timeout=0)
self.assertIs(None, tt.exception)
resume.set()
self.assertRaises(MyException, tt.join)
def test_sync_event(self):
control = threading.Event()
in_thread = threading.Event()
class MyException(Exception):
pass
def raise_my_exception():
# Wait for the test to tell us to resume
control.wait()
# Now we can raise
raise MyException()
tt = cethread.CatchingExceptionThread(target=raise_my_exception,
sync_event=in_thread)
tt.start()
tt.join(timeout=0)
self.assertIs(None, tt.exception)
self.assertIs(in_thread, tt.sync_event)
control.set()
self.assertRaises(MyException, tt.join)
self.assertEqual(True, tt.sync_event.isSet())
def test_switch_and_set(self):
"""Caller can precisely control a thread."""
control1 = threading.Event()
control2 = threading.Event()
control3 = threading.Event()
class TestThread(cethread.CatchingExceptionThread):
def __init__(self):
super(TestThread, self).__init__(target=self.step_by_step)
self.current_step = 'starting'
self.step1 = threading.Event()
self.set_sync_event(self.step1)
self.step2 = threading.Event()
self.final = threading.Event()
def step_by_step(self):
control1.wait()
self.current_step = 'step1'
self.switch_and_set(self.step2)
control2.wait()
self.current_step = 'step2'
self.switch_and_set(self.final)
control3.wait()
self.current_step = 'done'
tt = TestThread()
tt.start()
self.assertEqual('starting', tt.current_step)
control1.set()
tt.step1.wait()
self.assertEqual('step1', tt.current_step)
control2.set()
tt.step2.wait()
self.assertEqual('step2', tt.current_step)
control3.set()
# We don't wait on tt.final
tt.join()
self.assertEqual('done', tt.current_step)
def test_exception_while_switch_and_set(self):
control1 = threading.Event()
class MyException(Exception):
pass
class TestThread(cethread.CatchingExceptionThread):
def __init__(self, *args, **kwargs):
self.step1 = threading.Event()
self.step2 = threading.Event()
super(TestThread, self).__init__(target=self.step_by_step,
sync_event=self.step1)
self.current_step = 'starting'
self.set_sync_event(self.step1)
def step_by_step(self):
control1.wait()
self.current_step = 'step1'
self.switch_and_set(self.step2)
def set_sync_event(self, event):
# We force an exception while trying to set step2
if event is self.step2:
raise MyException()
super(TestThread, self).set_sync_event(event)
tt = TestThread()
tt.start()
self.assertEqual('starting', tt.current_step)
control1.set()
# We now wait on step1 which will be set when catching the exception
tt.step1.wait()
self.assertRaises(MyException, tt.pending_exception)
self.assertIs(tt.step1, tt.sync_event)
self.assertTrue(tt.step1.isSet())
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