def __init__(self):
assert ApplicationClient is not None
self._app_client = ApplicationClient.from_current()
self._nodes = defaultdict(set)
self._supervisor_watch_task = None
self._role_to_events = defaultdict(list)
def app_client(self):
if not hasattr(self, '_app_client'):
self._app_client = ApplicationClient.from_current()
return self._app_client