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from typing import Any, List, Optional, Tuple, cast
from reactivex import Observable, abc
from reactivex.disposable import CompositeDisposable, SingleAssignmentDisposable
def fork_join_(*sources: Observable[Any]) -> Observable[Tuple[Any, ...]]:
"""Wait for observables to complete and then combine last values
they emitted into a tuple. Whenever any of that observables completes
without emitting any value, result sequence will complete at that moment as well.
Examples:
>>> obs = reactivex.fork_join(obs1, obs2, obs3)
Returns:
An observable sequence containing the result of combining last element from
each source in given sequence.
"""
parent = sources[0]
def subscribe(
observer: abc.ObserverBase[Tuple[Any, ...]],
scheduler: Optional[abc.SchedulerBase] = None,
) -> abc.DisposableBase:
n = len(sources)
values = [None] * n
is_done = [False] * n
has_value = [False] * n
def done(i: int) -> None:
is_done[i] = True
if not has_value[i]:
observer.on_completed()
return
if all(is_done):
if all(has_value):
observer.on_next(tuple(values))
observer.on_completed()
else:
observer.on_completed()
subscriptions: List[SingleAssignmentDisposable] = [
cast(SingleAssignmentDisposable, None)
] * n
def _subscribe(i: int) -> None:
subscriptions[i] = SingleAssignmentDisposable()
def on_next(value: Any) -> None:
with parent.lock:
values[i] = value
has_value[i] = True
def on_completed() -> None:
with parent.lock:
done(i)
subscriptions[i].disposable = sources[i].subscribe(
on_next, observer.on_error, on_completed, scheduler=scheduler
)
for i in range(n):
_subscribe(i)
return CompositeDisposable(subscriptions)
return Observable(subscribe)
__all__ = ["fork_join_"]
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