from rx import Observable, AnonymousObservable
from rx.concurrency import timeout_scheduler
from rx.internal import extensionmethod
@extensionmethod(Observable)
def skip_last_with_time(self, duration, scheduler):
"""Skips elements for the specified duration from the end of the
observable source sequence, using the specified scheduler to run timers.
1 - res = source.skip_last_with_time(5000)
2 - res = source.skip_last_with_time(5000, scheduler)
Description:
This operator accumulates a queue with a length enough to store elements
received during the initial duration window. As more elements are
received, elements older than the specified duration are taken from the
queue and produced on the result sequence. This causes elements to be
delayed with duration.
Keyword arguments:
duration -- {Number} Duration for skipping elements from the end of the
sequence.
scheduler -- {Scheduler} [Optional] Scheduler to run the timer on. If
not specified, defaults to Rx.Scheduler.timeout
Returns an observable {Observable} sequence with the elements skipped
during the specified duration from the end of the source sequence.
"""
scheduler = scheduler or timeout_scheduler
duration = scheduler.to_timedelta(duration)
source = self
def subscribe(observer):
q = []
def on_next(x):
now = scheduler.now
q.append({"interval": now, "value": x})
while len(q) and now - q[0]["interval"] >= duration:
observer.on_next(q.pop(0)["value"])
def on_completed():
now = scheduler.now
while len(q) and now - q[0]["interval"] >= duration:
observer.on_next(q.pop(0)["value"])
observer.on_completed()
return source.subscribe(on_next, observer.on_error, on_completed)
return AnonymousObservable(subscribe)