70 lines
1.8 KiB
GDScript3
70 lines
1.8 KiB
GDScript3
|
static func switch_latest_() -> Callable:
|
||
|
|
var switch_latest = func(source : Observable) -> Observable:
|
||
|
|
# """Partially applied switch_latest operator.
|
||
|
|
#
|
||
|
|
# Transforms an observable sequence of observable sequences into
|
||
|
|
# an observable sequence producing values only from the most
|
||
|
|
# recent observable sequence.
|
||
|
|
#
|
||
|
|
# Returns:
|
||
|
|
# An observable sequence that at any point in time produces
|
||
|
|
# the elements of the most recent inner observable sequence
|
||
|
|
# that has been received.
|
||
|
|
# """
|
||
|
|
var subscribe = func(
|
||
|
|
observer : ObserverBase,
|
||
|
|
scheduler : SchedulerBase = null
|
||
|
|
) -> DisposableBase:
|
||
|
|
var inner_subscription = SerialDisposable.new()
|
||
|
|
var has_latest = [false]
|
||
|
|
var is_stopped = [false]
|
||
|
|
var latest = [0]
|
||
|
|
|
||
|
|
var on_next = func(inner_source : Observable):
|
||
|
|
var d = SingleAssignmentDisposable.new()
|
||
|
|
var _id
|
||
|
|
if true:
|
||
|
|
var __ = LockGuard.new(source.lock)
|
||
|
|
latest[0] += 1
|
||
|
|
_id = latest[0]
|
||
|
|
has_latest[0] = true
|
||
|
|
inner_subscription.disposable = d
|
||
|
|
|
||
|
|
var obs = inner_source
|
||
|
|
|
||
|
|
var on_next = func(x):
|
||
|
|
if latest[0] == _id:
|
||
|
|
observer.on_next(x)
|
||
|
|
|
||
|
|
var on_error = func(e):
|
||
|
|
if latest[0] == _id:
|
||
|
|
observer.on_error(e)
|
||
|
|
|
||
|
|
var on_completed = func():
|
||
|
|
if latest[0] == _id:
|
||
|
|
has_latest[0] = false
|
||
|
|
if is_stopped[0]:
|
||
|
|
observer.on_completed()
|
||
|
|
|
||
|
|
d.disposable = obs.subscribe(
|
||
|
|
on_next, on_error, on_completed,
|
||
|
|
scheduler
|
||
|
|
)
|
||
|
|
|
||
|
|
var on_completed = func():
|
||
|
|
is_stopped[0] = true
|
||
|
|
if not has_latest[0]:
|
||
|
|
observer.on_completed()
|
||
|
|
|
||
|
|
var subscription = source.subscribe(
|
||
|
|
on_next, observer.on_error, on_completed,
|
||
|
|
scheduler
|
||
|
|
)
|
||
|
|
return CompositeDisposable.new([
|
||
|
|
subscription, inner_subscription
|
||
|
|
])
|
||
|
|
|
||
|
|
return Observable.new(subscribe)
|
||
|
|
|
||
|
|
return switch_latest
|