1 | import { async } from '../scheduler/async';
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2 | import { isDate } from '../util/isDate';
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3 | import { Subscriber } from '../Subscriber';
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4 | import { Notification } from '../Notification';
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5 | export function delay(delay, scheduler = async) {
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6 | const absoluteDelay = isDate(delay);
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7 | const delayFor = absoluteDelay ? (+delay - scheduler.now()) : Math.abs(delay);
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8 | return (source) => source.lift(new DelayOperator(delayFor, scheduler));
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9 | }
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10 | class DelayOperator {
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11 | constructor(delay, scheduler) {
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12 | this.delay = delay;
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13 | this.scheduler = scheduler;
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14 | }
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15 | call(subscriber, source) {
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16 | return source.subscribe(new DelaySubscriber(subscriber, this.delay, this.scheduler));
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17 | }
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18 | }
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19 | class DelaySubscriber extends Subscriber {
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20 | constructor(destination, delay, scheduler) {
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21 | super(destination);
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22 | this.delay = delay;
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23 | this.scheduler = scheduler;
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24 | this.queue = [];
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25 | this.active = false;
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26 | this.errored = false;
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27 | }
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28 | static dispatch(state) {
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29 | const source = state.source;
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30 | const queue = source.queue;
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31 | const scheduler = state.scheduler;
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32 | const destination = state.destination;
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33 | while (queue.length > 0 && (queue[0].time - scheduler.now()) <= 0) {
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34 | queue.shift().notification.observe(destination);
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35 | }
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36 | if (queue.length > 0) {
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37 | const delay = Math.max(0, queue[0].time - scheduler.now());
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38 | this.schedule(state, delay);
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39 | }
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40 | else {
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41 | this.unsubscribe();
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42 | source.active = false;
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43 | }
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44 | }
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45 | _schedule(scheduler) {
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46 | this.active = true;
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47 | const destination = this.destination;
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48 | destination.add(scheduler.schedule(DelaySubscriber.dispatch, this.delay, {
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49 | source: this, destination: this.destination, scheduler: scheduler
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50 | }));
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51 | }
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52 | scheduleNotification(notification) {
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53 | if (this.errored === true) {
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54 | return;
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55 | }
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56 | const scheduler = this.scheduler;
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57 | const message = new DelayMessage(scheduler.now() + this.delay, notification);
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58 | this.queue.push(message);
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59 | if (this.active === false) {
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60 | this._schedule(scheduler);
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61 | }
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62 | }
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63 | _next(value) {
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64 | this.scheduleNotification(Notification.createNext(value));
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65 | }
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66 | _error(err) {
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67 | this.errored = true;
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68 | this.queue = [];
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69 | this.destination.error(err);
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70 | this.unsubscribe();
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71 | }
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72 | _complete() {
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73 | this.scheduleNotification(Notification.createComplete());
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74 | this.unsubscribe();
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75 | }
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76 | }
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77 | class DelayMessage {
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78 | constructor(time, notification) {
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79 | this.time = time;
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80 | this.notification = notification;
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81 | }
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82 | }
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83 | //# sourceMappingURL=delay.js.map |
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