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from typing import Any, Callable, List, Optional, TypeVar, cast
from reactivex import Observable, abc, typing
from reactivex.disposable import (
CompositeDisposable,
SerialDisposable,
SingleAssignmentDisposable,
)
from reactivex.scheduler import TimeoutScheduler
_T = TypeVar("_T")
def debounce_(
duetime: typing.RelativeTime, scheduler: Optional[abc.SchedulerBase]
) -> Callable[[Observable[_T]], Observable[_T]]:
def debounce(source: Observable[_T]) -> Observable[_T]:
"""Ignores values from an observable sequence which are followed by
another value before duetime.
Example:
>>> res = debounce(source)
Args:
source: Source observable to debounce.
Returns:
An operator function that takes the source observable and
returns the debounced observable sequence.
"""
def subscribe(
observer: abc.ObserverBase[_T],
scheduler_: Optional[abc.SchedulerBase] = None,
) -> abc.DisposableBase:
_scheduler = scheduler or scheduler_ or TimeoutScheduler.singleton()
cancelable = SerialDisposable()
has_value = [False]
value: List[_T] = [cast(_T, None)]
_id: List[int] = [0]
def on_next(x: _T) -> None:
has_value[0] = True
value[0] = x
_id[0] += 1
current_id = _id[0]
d = SingleAssignmentDisposable()
cancelable.disposable = d
def action(scheduler: abc.SchedulerBase, state: Any = None) -> None:
if has_value[0] and _id[0] == current_id:
observer.on_next(value[0])
has_value[0] = False
d.disposable = _scheduler.schedule_relative(duetime, action)
def on_error(exception: Exception) -> None:
cancelable.dispose()
observer.on_error(exception)
has_value[0] = False
_id[0] += 1
def on_completed() -> None:
cancelable.dispose()
if has_value[0]:
observer.on_next(value[0])
observer.on_completed()
has_value[0] = False
_id[0] += 1
subscription = source.subscribe(
on_next, on_error, on_completed, scheduler=scheduler_
)
return CompositeDisposable(subscription, cancelable)
return Observable(subscribe)
return debounce
def throttle_with_mapper_(
throttle_duration_mapper: Callable[[Any], Observable[Any]]
) -> Callable[[Observable[_T]], Observable[_T]]:
def throttle_with_mapper(source: Observable[_T]) -> Observable[_T]:
"""Partially applied throttle_with_mapper operator.
Ignores values from an observable sequence which are followed by
another value within a computed throttle duration.
Example:
>>> obs = throttle_with_mapper(source)
Args:
source: The observable source to throttle.
Returns:
The throttled observable sequence.
"""
def subscribe(
observer: abc.ObserverBase[_T],
scheduler: Optional[abc.SchedulerBase] = None,
) -> abc.DisposableBase:
cancelable = SerialDisposable()
has_value: bool = False
value: _T = cast(_T, None)
_id = [0]
def on_next(x: _T) -> None:
nonlocal value, has_value
throttle = None
try:
throttle = throttle_duration_mapper(x)
except Exception as e: # pylint: disable=broad-except
observer.on_error(e)
return
has_value = True
value = x
_id[0] += 1
current_id = _id[0]
d = SingleAssignmentDisposable()
cancelable.disposable = d
def on_next(x: Any) -> None:
nonlocal has_value
if has_value and _id[0] == current_id:
observer.on_next(value)
has_value = False
d.dispose()
def on_completed() -> None:
nonlocal has_value
if has_value and _id[0] == current_id:
observer.on_next(value)
has_value = False
d.dispose()
d.disposable = throttle.subscribe(
on_next, observer.on_error, on_completed, scheduler=scheduler
)
def on_error(e: Exception) -> None:
nonlocal has_value
cancelable.dispose()
observer.on_error(e)
has_value = False
_id[0] += 1
def on_completed() -> None:
nonlocal has_value
cancelable.dispose()
if has_value:
observer.on_next(value)
observer.on_completed()
has_value = False
_id[0] += 1
subscription = source.subscribe(
on_next, on_error, on_completed, scheduler=scheduler
)
return CompositeDisposable(subscription, cancelable)
return Observable(subscribe)
return throttle_with_mapper
__all__ = ["debounce_", "throttle_with_mapper_"]
|
