def _start_dispatch(self):
"""Start a thread to dispatch requests queued up by callbacks.
.. note::
This assumes, but does not check, that ``_dispatch_thread``
is :data:`None`.
Spawns a thread to run :meth:`dispatch_callback` and sets the
"dispatch thread" member on the current policy.
"""
_LOGGER.debug('Starting callback requests worker.')
dispatch_worker = _helper_threads.QueueCallbackWorker(
self._request_queue,
self.dispatch_callback,
)
# Create and start the helper thread.
thread = threading.Thread(
name=_CALLBACK_WORKER_NAME,
target=dispatch_worker,
)
thread.daemon = True
thread.start()
_LOGGER.debug('Started helper thread %s', thread.name)
self._dispatch_thread = thread
def test_queue_callback_worker_exception():
queue_ = queue.Queue()
callback = mock.Mock(spec=(), side_effect=(Exception, ))
qct = _helper_threads.QueueCallbackWorker(queue_, callback)
# Set up an appropriate mock for the queue, and call the queue callback
# thread.
with mock.patch.object(queue.Queue, 'get') as get:
item1 = ('action', mock.sentinel.A)
get.side_effect = (item1, _helper_threads.STOP)
qct()
# Assert that we got the expected calls.
assert get.call_count == 2
callback.assert_called_once_with('action', mock.sentinel.A)
def test_queue_callback_worker():
queue_ = queue.Queue()
callback = mock.Mock(spec=())
qct = _helper_threads.QueueCallbackWorker(queue_, callback)
# Set up an appropriate mock for the queue, and call the queue callback
# thread.
with mock.patch.object(queue.Queue, 'get') as get:
get.side_effect = (
mock.sentinel.A,
_helper_threads.STOP,
queue.Empty())
qct()
# Assert that we got the expected calls.
assert get.call_count == 3
callback.assert_called_once_with([mock.sentinel.A])