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from typing import Callable, List, Optional, TypeVar
from reactivex import Observable, abc
_T = TypeVar("_T")
def take_last_buffer_(count: int) -> Callable[[Observable[_T]], Observable[List[_T]]]:
def take_last_buffer(source: Observable[_T]) -> Observable[List[_T]]:
"""Returns an array with the specified number of contiguous
elements from the end of an observable sequence.
Example:
>>> res = take_last(source)
This operator accumulates a buffer with a length enough to
store elements count elements. Upon completion of the source
sequence, this buffer is drained on the result sequence. This
causes the elements to be delayed.
Args:
source: Source observable to take elements from.
Returns:
An observable sequence containing a single list with the
specified number of elements from the end of the source
sequence.
"""
def subscribe(
observer: abc.ObserverBase[List[_T]],
scheduler: Optional[abc.SchedulerBase] = None,
) -> abc.DisposableBase:
q: List[_T] = []
def on_next(x: _T) -> None:
with source.lock:
q.append(x)
if len(q) > count:
q.pop(0)
def on_completed() -> None:
observer.on_next(q)
observer.on_completed()
return source.subscribe(
on_next, observer.on_error, on_completed, scheduler=scheduler
)
return Observable(subscribe)
return take_last_buffer
__all__ = ["take_last_buffer_"]
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