| import { isNumeric } from '../util/isNumeric'; |
| import { Observable } from '../Observable'; |
| import { async } from '../scheduler/async'; |
| /** |
| * We need this JSDoc comment for affecting ESDoc. |
| * @extends {Ignored} |
| * @hide true |
| */ |
| export class IntervalObservable extends Observable { |
| constructor(period = 0, scheduler = async) { |
| super(); |
| this.period = period; |
| this.scheduler = scheduler; |
| if (!isNumeric(period) || period < 0) { |
| this.period = 0; |
| } |
| if (!scheduler || typeof scheduler.schedule !== 'function') { |
| this.scheduler = async; |
| } |
| } |
| /** |
| * Creates an Observable that emits sequential numbers every specified |
| * interval of time, on a specified IScheduler. |
| * |
| * <span class="informal">Emits incremental numbers periodically in time. |
| * </span> |
| * |
| * <img src="./img/interval.png" width="100%"> |
| * |
| * `interval` returns an Observable that emits an infinite sequence of |
| * ascending integers, with a constant interval of time of your choosing |
| * between those emissions. The first emission is not sent immediately, but |
| * only after the first period has passed. By default, this operator uses the |
| * `async` IScheduler to provide a notion of time, but you may pass any |
| * IScheduler to it. |
| * |
| * @example <caption>Emits ascending numbers, one every second (1000ms)</caption> |
| * var numbers = Rx.Observable.interval(1000); |
| * numbers.subscribe(x => console.log(x)); |
| * |
| * @see {@link timer} |
| * @see {@link delay} |
| * |
| * @param {number} [period=0] The interval size in milliseconds (by default) |
| * or the time unit determined by the scheduler's clock. |
| * @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 sequential number each time |
| * interval. |
| * @static true |
| * @name interval |
| * @owner Observable |
| */ |
| static create(period = 0, scheduler = async) { |
| return new IntervalObservable(period, scheduler); |
| } |
| static dispatch(state) { |
| const { index, subscriber, period } = state; |
| subscriber.next(index); |
| if (subscriber.closed) { |
| return; |
| } |
| state.index += 1; |
| this.schedule(state, period); |
| } |
| _subscribe(subscriber) { |
| const index = 0; |
| const period = this.period; |
| const scheduler = this.scheduler; |
| subscriber.add(scheduler.schedule(IntervalObservable.dispatch, period, { |
| index, subscriber, period |
| })); |
| } |
| } |
| //# sourceMappingURL=IntervalObservable.js.map |