Turn an object_id into a Future object.

        Args:
            object_id: A Ray's object_id.
            check_ready (bool): If true, check if the object_id is ready.

        Returns:
            PlasmaObjectFuture: A future object that waits the object_id.

def as_future(self, object_id, check_ready=True):
        """Turn an object_id into a Future object.

        Args:
            object_id: A Ray's object_id.
            check_ready (bool): If true, check if the object_id is ready.

        Returns:
            PlasmaObjectFuture: A future object that waits the object_id.
        """
        if not isinstance(object_id, ray.ObjectID):
            raise TypeError("Input should be an ObjectID.")

        plain_object_id = plasma.ObjectID(object_id.binary())
        fut = PlasmaObjectFuture(loop=self._loop, object_id=plain_object_id)

        if check_ready:
            ready, _ = ray.wait([object_id], timeout=0)
            if ready:
                if self._loop.get_debug():
                    logger.debug("%s has been ready.", plain_object_id)
                self._complete_future(fut)
                return fut

        if plain_object_id not in self._waiting_dict:
            linked_list = PlasmaObjectLinkedList(self._loop, plain_object_id)
            linked_list.add_done_callback(self._unregister_callback)
            self._waiting_dict[plain_object_id] = linked_list
        self._waiting_dict[plain_object_id].append(fut)
        if self._loop.get_debug():
            logger.debug("%s added to the waiting list.", fut)

        return fut