def testCancelPostEnd(self):
"""
Check that canceller is not called if cancelled after end
"""
self.cancelled = 0
future = CancellableFuture()
future.task_canceller = self.cancel_task
self.assertEqual(self.cancelled, 0)
# "start" the task
future.set_running_or_notify_cancel()
# "end" the task
future.set_result("boo")
self.assertEqual(future.result(), "boo")
# try to cancel after end
self.assertFalse(future.cancel())
self.assertFalse(future.cancelled())
# The result shouldn't change
self.assertEqual(future.result(), "boo")
self.assertEqual(self.cancelled, 0)
def testCancelPostEnd(self):
"""
Check that canceller is not called if cancelled after end
"""
self.cancelled = 0
future = CancellableFuture()
future.task_canceller = self.cancel_task
self.assertEqual(self.cancelled, 0)
# "start" the task
future.set_running_or_notify_cancel()
# "end" the task
future.set_result("boo")
self.assertEqual(future.result(), "boo")
# try to cancel after end
self.assertFalse(future.cancel())
self.assertFalse(future.cancelled())
# The result shouldn't change
self.assertEqual(future.result(), "boo")
self.assertEqual(self.cancelled, 0)
def test_multiple_parallel(self):
"""
Try to cancel multiple running futures in parallel
"""
random.seed(0)
self.executor = ParallelThreadPoolExecutor()
# Put several task with random sets
fs = []
self.called = 0
for i in range(10):
f = CancellableFuture()
f.task_canceller = self._canceller
f._must_stop = threading.Event()
r_letter1, r_letter2 = random.choice('abcxyz'), random.choice(
'abcxyz')
f = self.executor.submitf(set([r_letter1, r_letter2]), f,
self._cancellable_task, f, 2)
f.add_done_callback(self._on_end_task)
fs.append(f)
time.sleep(
10 * 2 + 1
) # in the worst case, there is a dependency between every task, so 2*10
self.assertEqual(self.called, 10)
for f in fs:
self.assertIsInstance(f.result(), int)
self.assertTrue(f.done())
def test_multiple_parallel_cancelled(self):
"""
Try to cancel multiple running futures in parallel
"""
random.seed(0)
self.executor = ParallelThreadPoolExecutor()
# Put several task with random sets
fs = []
self.called = 0
for i in range(10):
f = CancellableFuture()
f.task_canceller = self._canceller
f._must_stop = threading.Event()
r_letter1, r_letter2 = random.choice('abcxyz'), random.choice('abcxyz')
f = self.executor.submitf(set([r_letter1, r_letter2]), f, self._cancellable_task, f, 2)
f.add_done_callback(self._on_end_task)
fs.append(f)
time.sleep(0.1)
# Cancel half of the tasks
for f in fs[1::2]:
f.cancel()
time.sleep(10 * 2 + 1) # in the worst case, there is a dependency between every task, so 2*10
self.assertEqual(self.called, 10) # done callback is called for all futures
for f in fs[1::2]:
self.assertTrue(f.cancelled())
self.assertRaises(CancelledError, f.result)
for f in fs[0::2]:
self.assertIsInstance(f.result(), int)
self.assertTrue(f.done())
