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import logging
from typing import Callable, List, Optional, TypeVar
from reactivex import Observable, abc
from reactivex.disposable import RefCountDisposable, SingleAssignmentDisposable
from reactivex.internal import ArgumentOutOfRangeException, add_ref
from reactivex.subject import Subject
log = logging.getLogger("Rx")
_T = TypeVar("_T")
def window_with_count_(
count: int, skip: Optional[int] = None
) -> Callable[[Observable[_T]], Observable[Observable[_T]]]:
"""Projects each element of an observable sequence into zero or more
windows which are produced based on element count information.
Examples:
>>> window_with_count(10)
>>> window_with_count(10, 1)
Args:
count: Length of each window.
skip: [Optional] Number of elements to skip between creation of
consecutive windows. If not specified, defaults to the
count.
Returns:
An observable sequence of windows.
"""
if count <= 0:
raise ArgumentOutOfRangeException()
skip_ = skip if skip is not None else count
if skip_ <= 0:
raise ArgumentOutOfRangeException()
def window_with_count(source: Observable[_T]) -> Observable[Observable[_T]]:
def subscribe(
observer: abc.ObserverBase[Observable[_T]],
scheduler: Optional[abc.SchedulerBase] = None,
):
m = SingleAssignmentDisposable()
refCountDisposable = RefCountDisposable(m)
n = [0]
q: List[Subject[_T]] = []
def create_window():
s: Subject[_T] = Subject()
q.append(s)
observer.on_next(add_ref(s, refCountDisposable))
create_window()
def on_next(x: _T) -> None:
for item in q:
item.on_next(x)
c = n[0] - count + 1
if c >= 0 and c % skip_ == 0:
s = q.pop(0)
s.on_completed()
n[0] += 1
if (n[0] % skip_) == 0:
create_window()
def on_error(exception: Exception) -> None:
while q:
q.pop(0).on_error(exception)
observer.on_error(exception)
def on_completed() -> None:
while q:
q.pop(0).on_completed()
observer.on_completed()
m.disposable = source.subscribe(
on_next, on_error, on_completed, scheduler=scheduler
)
return refCountDisposable
return Observable(subscribe)
return window_with_count
__all__ = ["window_with_count_"]
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