//
|
// Window.swift
|
// RxSwift
|
//
|
// Created by Junior B. on 29/10/15.
|
// Copyright © 2015 Krunoslav Zaher. All rights reserved.
|
//
|
|
import Foundation
|
|
extension ObservableType {
|
|
/**
|
Projects each element of an observable sequence into a window that is completed when either it’s full or a given amount of time has elapsed.
|
|
- seealso: [window operator on reactivex.io](http://reactivex.io/documentation/operators/window.html)
|
|
- parameter timeSpan: Maximum time length of a window.
|
- parameter count: Maximum element count of a window.
|
- parameter scheduler: Scheduler to run windowing timers on.
|
- returns: An observable sequence of windows (instances of `Observable`).
|
*/
|
public func window(timeSpan: RxTimeInterval, count: Int, scheduler: SchedulerType)
|
-> Observable<Observable<Element>> {
|
return WindowTimeCount(source: self.asObservable(), timeSpan: timeSpan, count: count, scheduler: scheduler)
|
}
|
}
|
|
final private class WindowTimeCountSink<Element, Observer: ObserverType>
|
: Sink<Observer>
|
, ObserverType
|
, LockOwnerType
|
, SynchronizedOnType where Observer.Element == Observable<Element> {
|
typealias Parent = WindowTimeCount<Element>
|
|
private let parent: Parent
|
|
let lock = RecursiveLock()
|
|
private var subject = PublishSubject<Element>()
|
private var count = 0
|
private var windowId = 0
|
|
private let timerD = SerialDisposable()
|
private let refCountDisposable: RefCountDisposable
|
private let groupDisposable = CompositeDisposable()
|
|
init(parent: Parent, observer: Observer, cancel: Cancelable) {
|
self.parent = parent
|
|
_ = self.groupDisposable.insert(self.timerD)
|
|
self.refCountDisposable = RefCountDisposable(disposable: self.groupDisposable)
|
super.init(observer: observer, cancel: cancel)
|
}
|
|
func run() -> Disposable {
|
|
self.forwardOn(.next(AddRef(source: self.subject, refCount: self.refCountDisposable).asObservable()))
|
self.createTimer(self.windowId)
|
|
_ = self.groupDisposable.insert(self.parent.source.subscribe(self))
|
return self.refCountDisposable
|
}
|
|
func startNewWindowAndCompleteCurrentOne() {
|
self.subject.on(.completed)
|
self.subject = PublishSubject<Element>()
|
|
self.forwardOn(.next(AddRef(source: self.subject, refCount: self.refCountDisposable).asObservable()))
|
}
|
|
func on(_ event: Event<Element>) {
|
self.synchronizedOn(event)
|
}
|
|
func synchronized_on(_ event: Event<Element>) {
|
var newWindow = false
|
var newId = 0
|
|
switch event {
|
case .next(let element):
|
self.subject.on(.next(element))
|
|
do {
|
_ = try incrementChecked(&self.count)
|
} catch let e {
|
self.subject.on(.error(e as Swift.Error))
|
self.dispose()
|
}
|
|
if self.count == self.parent.count {
|
newWindow = true
|
self.count = 0
|
self.windowId += 1
|
newId = self.windowId
|
self.startNewWindowAndCompleteCurrentOne()
|
}
|
|
case .error(let error):
|
self.subject.on(.error(error))
|
self.forwardOn(.error(error))
|
self.dispose()
|
case .completed:
|
self.subject.on(.completed)
|
self.forwardOn(.completed)
|
self.dispose()
|
}
|
|
if newWindow {
|
self.createTimer(newId)
|
}
|
}
|
|
func createTimer(_ windowId: Int) {
|
if self.timerD.isDisposed {
|
return
|
}
|
|
if self.windowId != windowId {
|
return
|
}
|
|
let nextTimer = SingleAssignmentDisposable()
|
|
self.timerD.disposable = nextTimer
|
|
let scheduledRelative = self.parent.scheduler.scheduleRelative(windowId, dueTime: self.parent.timeSpan) { previousWindowId in
|
|
var newId = 0
|
|
self.lock.performLocked {
|
if previousWindowId != self.windowId {
|
return
|
}
|
|
self.count = 0
|
self.windowId = self.windowId &+ 1
|
newId = self.windowId
|
self.startNewWindowAndCompleteCurrentOne()
|
}
|
|
self.createTimer(newId)
|
|
return Disposables.create()
|
}
|
|
nextTimer.setDisposable(scheduledRelative)
|
}
|
}
|
|
final private class WindowTimeCount<Element>: Producer<Observable<Element>> {
|
fileprivate let timeSpan: RxTimeInterval
|
fileprivate let count: Int
|
fileprivate let scheduler: SchedulerType
|
fileprivate let source: Observable<Element>
|
|
init(source: Observable<Element>, timeSpan: RxTimeInterval, count: Int, scheduler: SchedulerType) {
|
self.source = source
|
self.timeSpan = timeSpan
|
self.count = count
|
self.scheduler = scheduler
|
}
|
|
override func run<Observer: ObserverType>(_ observer: Observer, cancel: Cancelable) -> (sink: Disposable, subscription: Disposable) where Observer.Element == Observable<Element> {
|
let sink = WindowTimeCountSink(parent: self, observer: observer, cancel: cancel)
|
let subscription = sink.run()
|
return (sink: sink, subscription: subscription)
|
}
|
}
|
