//
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// DelaySubscription.swift
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// RxSwift
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//
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// Created by Krunoslav Zaher on 6/14/15.
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// Copyright © 2015 Krunoslav Zaher. All rights reserved.
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//
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import Foundation
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extension ObservableType {
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/**
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Time shifts the observable sequence by delaying the subscription with the specified relative time duration, using the specified scheduler to run timers.
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- seealso: [delay operator on reactivex.io](http://reactivex.io/documentation/operators/delay.html)
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- parameter dueTime: Relative time shift of the subscription.
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- parameter scheduler: Scheduler to run the subscription delay timer on.
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- returns: Time-shifted sequence.
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*/
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public func delaySubscription(_ dueTime: RxTimeInterval, scheduler: SchedulerType)
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-> Observable<Element> {
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DelaySubscription(source: self.asObservable(), dueTime: dueTime, scheduler: scheduler)
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}
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}
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final private class DelaySubscriptionSink<Observer: ObserverType>
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: Sink<Observer>, ObserverType {
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typealias Element = Observer.Element
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func on(_ event: Event<Element>) {
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self.forwardOn(event)
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if event.isStopEvent {
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self.dispose()
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}
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}
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}
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final private class DelaySubscription<Element>: Producer<Element> {
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private let source: Observable<Element>
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private let dueTime: RxTimeInterval
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private let scheduler: SchedulerType
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init(source: Observable<Element>, dueTime: RxTimeInterval, scheduler: SchedulerType) {
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self.source = source
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self.dueTime = dueTime
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self.scheduler = scheduler
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}
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override func run<Observer: ObserverType>(_ observer: Observer, cancel: Cancelable) -> (sink: Disposable, subscription: Disposable) where Observer.Element == Element {
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let sink = DelaySubscriptionSink(observer: observer, cancel: cancel)
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let subscription = self.scheduler.scheduleRelative((), dueTime: self.dueTime) { _ in
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return self.source.subscribe(sink)
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}
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return (sink: sink, subscription: subscription)
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}
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}
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