firestar5683
93 lines
3.0 KiB
Python
93 lines
3.0 KiB
Python
from asyncio import Future
|
|
from typing import Callable, List, Optional, TypeVar, Union
|
|
|
|
from reactivex import Observable, abc, from_future
|
|
from reactivex.disposable import CompositeDisposable, SingleAssignmentDisposable
|
|
|
|
_T = TypeVar("_T")
|
|
|
|
|
|
def amb_(
|
|
right_source: Union[Observable[_T], "Future[_T]"]
|
|
) -> Callable[[Observable[_T]], Observable[_T]]:
|
|
|
|
if isinstance(right_source, Future):
|
|
obs: Observable[_T] = from_future(right_source)
|
|
else:
|
|
obs = right_source
|
|
|
|
def amb(left_source: Observable[_T]) -> Observable[_T]:
|
|
def subscribe(
|
|
observer: abc.ObserverBase[_T],
|
|
scheduler: Optional[abc.SchedulerBase] = None,
|
|
) -> abc.DisposableBase:
|
|
choice: List[Optional[str]] = [None]
|
|
left_choice = "L"
|
|
right_choice = "R"
|
|
left_subscription = SingleAssignmentDisposable()
|
|
right_subscription = SingleAssignmentDisposable()
|
|
|
|
def choice_left():
|
|
if not choice[0]:
|
|
choice[0] = left_choice
|
|
right_subscription.dispose()
|
|
|
|
def choice_right():
|
|
if not choice[0]:
|
|
choice[0] = right_choice
|
|
left_subscription.dispose()
|
|
|
|
def on_next_left(value: _T) -> None:
|
|
with left_source.lock:
|
|
choice_left()
|
|
if choice[0] == left_choice:
|
|
observer.on_next(value)
|
|
|
|
def on_error_left(err: Exception) -> None:
|
|
with left_source.lock:
|
|
choice_left()
|
|
if choice[0] == left_choice:
|
|
observer.on_error(err)
|
|
|
|
def on_completed_left() -> None:
|
|
with left_source.lock:
|
|
choice_left()
|
|
if choice[0] == left_choice:
|
|
observer.on_completed()
|
|
|
|
left_d = left_source.subscribe(
|
|
on_next_left, on_error_left, on_completed_left, scheduler=scheduler
|
|
)
|
|
left_subscription.disposable = left_d
|
|
|
|
def send_right(value: _T) -> None:
|
|
with left_source.lock:
|
|
choice_right()
|
|
if choice[0] == right_choice:
|
|
observer.on_next(value)
|
|
|
|
def on_error_right(err: Exception) -> None:
|
|
with left_source.lock:
|
|
choice_right()
|
|
if choice[0] == right_choice:
|
|
observer.on_error(err)
|
|
|
|
def on_completed_right() -> None:
|
|
with left_source.lock:
|
|
choice_right()
|
|
if choice[0] == right_choice:
|
|
observer.on_completed()
|
|
|
|
right_d = obs.subscribe(
|
|
send_right, on_error_right, on_completed_right, scheduler=scheduler
|
|
)
|
|
right_subscription.disposable = right_d
|
|
return CompositeDisposable(left_subscription, right_subscription)
|
|
|
|
return Observable(subscribe)
|
|
|
|
return amb
|
|
|
|
|
|
__all__ = ["amb_"]
|