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The relative\n * time intervals between the values are preserved.\n *\n * If the delay argument is a Date, this operator time shifts the start of the\n * Observable execution until the given date occurs.\n *\n * @example <caption>Delay each click by one second</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var delayedClicks = clicks.delay(1000); // each click emitted after 1 second\n * delayedClicks.subscribe(x => console.log(x));\n *\n * @example <caption>Delay all clicks until a future date happens</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var date = new Date('March 15, 2050 12:00:00'); // in the future\n * var delayedClicks = clicks.delay(date); // click emitted only after that date\n * delayedClicks.subscribe(x => console.log(x));\n *\n * @see {@link debounceTime}\n * @see {@link delayWhen}\n *\n * @param {number|Date} delay The delay duration in milliseconds (a `number`) or\n * a `Date` until which the emission of the source items is delayed.\n * @param {Scheduler} [scheduler=async] The IScheduler to use for\n * managing the timers that handle the time-shift for each item.\n * @return {Observable} An Observable that delays the emissions of the source\n * Observable by the specified timeout or Date.\n * @method delay\n * @owner Observable\n */\nexport function delay<T>(delay: number|Date,\n scheduler: IScheduler = async): MonoTypeOperatorFunction<T> {\n const absoluteDelay = isDate(delay);\n const delayFor = absoluteDelay ? (+delay - scheduler.now()) : Math.abs(<number>delay);\n return (source: Observable<T>) => source.lift(new DelayOperator(delayFor, scheduler));\n}\n\nclass DelayOperator<T> implements Operator<T, T> {\n constructor(private delay: number,\n private scheduler: IScheduler) {\n }\n\n call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n return source.subscribe(new DelaySubscriber(subscriber, this.delay, this.scheduler));\n }\n}\n\ninterface DelayState<T> {\n source: DelaySubscriber<T>;\n destination: PartialObserver<T>;\n scheduler: IScheduler;\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass DelaySubscriber<T> extends Subscriber<T> {\n private queue: Array<DelayMessage<T>> = [];\n private active: boolean = false;\n private errored: boolean = false;\n\n private static dispatch<T>(this: Action<DelayState<T>>, state: DelayState<T>): void {\n const source = state.source;\n const queue = source.queue;\n const scheduler = state.scheduler;\n const destination = state.destination;\n\n while (queue.length > 0 && (queue[0].time - scheduler.now()) <= 0) {\n queue.shift().notification.observe(destination);\n }\n\n if (queue.length > 0) {\n const delay = Math.max(0, queue[0].time - scheduler.now());\n this.schedule(state, delay);\n } else {\n this.unsubscribe();\n source.active = false;\n }\n }\n\n constructor(destination: Subscriber<T>,\n private delay: number,\n private scheduler: IScheduler) {\n super(destination);\n }\n\n private _schedule(scheduler: IScheduler): void {\n this.active = true;\n this.add(scheduler.schedule<DelayState<T>>(DelaySubscriber.dispatch, this.delay, {\n source: this, destination: this.destination, scheduler: scheduler\n }));\n }\n\n private scheduleNotification(notification: Notification<T>): void {\n if (this.errored === true) {\n return;\n }\n\n const scheduler = this.scheduler;\n const message = new DelayMessage(scheduler.now() + this.delay, notification);\n this.queue.push(message);\n\n if (this.active === false) {\n this._schedule(scheduler);\n }\n }\n\n protected _next(value: T) {\n this.scheduleNotification(Notification.createNext(value));\n }\n\n protected _error(err: any) {\n this.errored = true;\n this.queue = [];\n this.destination.error(err);\n }\n\n protected _complete() {\n this.scheduleNotification(Notification.createComplete());\n }\n}\n\nclass DelayMessage<T> {\n constructor(public readonly time: number,\n public readonly notification: Notification<T>) {\n }\n}\n"]}
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