import {isNumeric} from '../util/isNumeric';
import {Scheduler} from '../Scheduler';
import {Observable} from '../Observable';
import {asap} from '../scheduler/asap';
import {isScheduler} from '../util/isScheduler';
import {isDate} from '../util/isDate';
export class TimerObservable<T> extends Observable<T> {
static create(IdueTime: number | Date = 0, period?: number | Scheduler, scheduler?: Scheduler): Observable<number> {
return new TimerObservable(dueTime, period, scheduler);
}
static dispatch(state) {
const { index, period, subscriber } = state;
const action = (<any> this);
subscriber.next(index);
if (typeof period === 'undefined') {
subscriber.complete();
return;
} else if (subscriber.isUnsubscribed) {
return;
}
if (typeof action.delay === 'undefined') {
action.add(action.scheduler.schedule(TimerObservable.dispatch, period, {
index: index + 1, period, subscriber
}));
} else {
state.index = index + 1;
action.schedule(state, period);
}
}
_period: number;
private dueTime: number = 0;
constructor(IdueTime: number | Date = 0,
private period?: number | Scheduler,
private scheduler?: Scheduler) {
super();
if (isNumeric(period)) {
this._period = Number(period) < 1 && 1 || Number(period);
} else if (isScheduler(period)) {
scheduler = <Scheduler> period;
}
if (!isScheduler(scheduler)) {
scheduler = asap;
}
this.scheduler = scheduler;
const absoluteDueTime = isDate(dueTime);
this.dueTime = absoluteDueTime ? (+dueTime - this.scheduler.now()) : <number>dueTime;
}
_subscribe(subscriber) {
const index = 0;
const period = this._period;
const dueTime = this.dueTime;
const scheduler = this.scheduler;
subscriber.add(scheduler.schedule(TimerObservable.dispatch, dueTime, { index, period, subscriber }));
}
}
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