3

我正在尝试有效地调用 tasklet 和 subtasklet：

@ndb.tasklet
def getBeds(bed_key):
    bed = yield bed_key.get_asyn()
    bed_info = {}
    ......
    raise ndb.Return(bed_info)

@ndb.tasklet
def getRoom(room_key):
    room = yield room_key.get_async()
    room_info = {}
    ..........
    beds_in_room = map(getBeds,room.beds)
    room_info["beds"] = beds_in_room
    raise ndb.Return(room_info)

@ndb.tasklet
def getBuilding(build_key):
    build = yield build_key.get_async()
    build_info = {}
    ...........
    rooms_in_build = map(getRoom,build.rooms)
    build_info["rooms"] = rooms_in_build

@ndb.toplevel
def getHotel(hotel_obj)
    hotel_inf = {}
    .........
    buildings_in_hotel = map(getBuilding,hotel_obj.buildings)
    hotel_inf["buildings"] = buildings_in_hotel
    return hotel_inf

出于某种原因，我虽然 @ndb.toplevel 会暂停 getHotel 直到一切完成。不幸的是，buildings_in_hotel 正在返回一个期货列表......

我如何让它完成？

4

1 回答 1

3

你屈服了！

当调用一个 tasklet 时，你总是得到一个 future，然后 yield 得到结果。还有并行 yield，您可以在其中产生一个元组或 tasklet 列表（有时称为屏障）。

beds_in_room = yield map(getBeds,room.beds)

和

rooms_in_build = yield map(getRoom,build.rooms)

和

buildings_in_hotel = yield map(getBuilding,hotel_obj.buildings)
于 2013-01-25T21:12:44.707 回答