| import { isNumeric } from '../util/isNumeric'; |
| import { Observable } from '../Observable'; |
| import { async } from '../scheduler/async'; |
| import { isScheduler } from '../util/isScheduler'; |
| import { isDate } from '../util/isDate'; |
| /** |
| * We need this JSDoc comment for affecting ESDoc. |
| * @extends {Ignored} |
| * @hide true |
| */ |
| export class TimerObservable extends Observable { |
| constructor(dueTime = 0, period, scheduler) { |
| super(); |
| this.period = -1; |
| this.dueTime = 0; |
| if (isNumeric(period)) { |
| this.period = Number(period) < 1 && 1 || Number(period); |
| } |
| else if (isScheduler(period)) { |
| scheduler = period; |
| } |
| if (!isScheduler(scheduler)) { |
| scheduler = async; |
| } |
| this.scheduler = scheduler; |
| this.dueTime = isDate(dueTime) ? |
| (+dueTime - this.scheduler.now()) : |
| dueTime; |
| } |
| /** |
| * Creates an Observable that starts emitting after an `initialDelay` and |
| * emits ever increasing numbers after each `period` of time thereafter. |
| * |
| * <span class="informal">Its like {@link interval}, but you can specify when |
| * should the emissions start.</span> |
| * |
| * <img src="./img/timer.png" width="100%"> |
| * |
| * `timer` returns an Observable that emits an infinite sequence of ascending |
| * integers, with a constant interval of time, `period` of your choosing |
| * between those emissions. The first emission happens after the specified |
| * `initialDelay`. The initial delay may be a {@link Date}. By default, this |
| * operator uses the `async` IScheduler to provide a notion of time, but you |
| * may pass any IScheduler to it. If `period` is not specified, the output |
| * Observable emits only one value, `0`. Otherwise, it emits an infinite |
| * sequence. |
| * |
| * @example <caption>Emits ascending numbers, one every second (1000ms), starting after 3 seconds</caption> |
| * var numbers = Rx.Observable.timer(3000, 1000); |
| * numbers.subscribe(x => console.log(x)); |
| * |
| * @example <caption>Emits one number after five seconds</caption> |
| * var numbers = Rx.Observable.timer(5000); |
| * numbers.subscribe(x => console.log(x)); |
| * |
| * @see {@link interval} |
| * @see {@link delay} |
| * |
| * @param {number|Date} initialDelay The initial delay time to wait before |
| * emitting the first value of `0`. |
| * @param {number} [period] The period of time between emissions of the |
| * subsequent numbers. |
| * @param {Scheduler} [scheduler=async] The IScheduler to use for scheduling |
| * the emission of values, and providing a notion of "time". |
| * @return {Observable} An Observable that emits a `0` after the |
| * `initialDelay` and ever increasing numbers after each `period` of time |
| * thereafter. |
| * @static true |
| * @name timer |
| * @owner Observable |
| */ |
| static create(initialDelay = 0, period, scheduler) { |
| return new TimerObservable(initialDelay, period, scheduler); |
| } |
| static dispatch(state) { |
| const { index, period, subscriber } = state; |
| const action = this; |
| subscriber.next(index); |
| if (subscriber.closed) { |
| return; |
| } |
| else if (period === -1) { |
| return subscriber.complete(); |
| } |
| state.index = index + 1; |
| action.schedule(state, period); |
| } |
| _subscribe(subscriber) { |
| const index = 0; |
| const { period, dueTime, scheduler } = this; |
| return scheduler.schedule(TimerObservable.dispatch, dueTime, { |
| index, period, subscriber |
| }); |
| } |
| } |
| //# sourceMappingURL=TimerObservable.js.map |