def future(self) -> Future:
fut = Future()
def set_future(data: Any) -> None:
"""Schedules a callback to set the exception or result
in the Future."""
if isinstance(data, Exception):
fut.set_exception(data)
else:
fut.set_result(data)
self._on_completed(set_future)
# Prevent this object ref from being released.
fut.object_ref = self
return fut
