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from typing import Callable, Optional, TypeVar, Union
from reactivex import ConnectableObservable, Observable, abc, compose
from reactivex import operators as ops
from reactivex.subject import Subject
from reactivex.typing import Mapper
_TSource = TypeVar("_TSource")
_TResult = TypeVar("_TResult")
def publish_(
mapper: Optional[Mapper[Observable[_TSource], Observable[_TResult]]] = None,
) -> Callable[
[Observable[_TSource]], Union[Observable[_TResult], ConnectableObservable[_TSource]]
]:
"""Returns an observable sequence that is the result of invoking the
mapper on a connectable observable sequence that shares a single
subscription to the underlying sequence. This operator is a
specialization of Multicast using a regular Subject.
Example:
>>> res = publish()
>>> res = publish(lambda x: x)
mapper: [Optional] Selector function which can use the
multicasted source sequence as many times as needed, without causing
multiple subscriptions to the source sequence. Subscribers to the
given source will receive all notifications of the source from the
time of the subscription on.
Returns:
An observable sequence that contains the elements of a sequence
produced by multicasting the source sequence within a mapper
function.
"""
if mapper:
def factory(scheduler: Optional[abc.SchedulerBase] = None) -> Subject[_TSource]:
return Subject()
return ops.multicast(subject_factory=factory, mapper=mapper)
subject: Subject[_TSource] = Subject()
return ops.multicast(subject=subject)
def share_() -> Callable[[Observable[_TSource]], Observable[_TSource]]:
"""Share a single subscription among multple observers.
Returns a new Observable that multicasts (shares) the original
Observable. As long as there is at least one Subscriber this
Observable will be subscribed and emitting data. When all
subscribers have unsubscribed it will unsubscribe from the source
Observable.
This is an alias for a composed publish() and ref_count().
"""
return compose(
ops.publish(),
ops.ref_count(),
)
__all__ = ["publish_", "share_"]
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