def add_done_callback(self, fn):
"""Add a callback to be executed when the operation is complete.
If the operation is not already complete, this will start a helper
thread to poll for the status of the operation in the background.
Args:
fn (Callable[Future]): The callback to execute when the operation
is complete.
"""
if self._result_set:
_helpers.safe_invoke_callback(fn, self)
return
self._done_callbacks.append(fn)
if self._polling_thread is None:
# The polling thread will exit on its own as soon as the operation
# is done.
self._polling_thread = _helpers.start_daemon_thread(
target=self._blocking_poll)
def add_done_callback(self, fn):
"""Add a callback to be executed when the operation is complete.
If the operation is not already complete, this will start a helper
thread to poll for the status of the operation in the background.
Args:
fn (Callable[Future]): The callback to execute when the operation
is complete.
"""
if self._result_set:
_helpers.safe_invoke_callback(fn, self)
return
self._done_callbacks.append(fn)
if self._polling_thread is None:
# The polling thread will exit on its own as soon as the operation
# is done.
self._polling_thread = _helpers.start_daemon_thread(
target=self._blocking_poll)
def test_start_deamon_thread(unused_thread):
deamon_thread = _helpers.start_daemon_thread(target=mock.sentinel.target)
assert deamon_thread.daemon is True
def test_start_deamon_thread(unused_thread):
deamon_thread = _helpers.start_daemon_thread(target=mock.sentinel.target)
assert deamon_thread.daemon is True