mirror of
https://github.com/biobulkbende/biobulkbende.org.git
synced 2024-12-27 05:15:25 +00:00
54 lines
2.9 KiB
JavaScript
54 lines
2.9 KiB
JavaScript
import { async } from '../scheduler/async';
|
|
import { timeoutWith as higherOrder } from '../operators/timeoutWith';
|
|
/* tslint:enable:max-line-length */
|
|
/**
|
|
*
|
|
* Errors if Observable does not emit a value in given time span, in case of which
|
|
* subscribes to the second Observable.
|
|
*
|
|
* <span class="informal">It's a version of `timeout` operator that let's you specify fallback Observable.</span>
|
|
*
|
|
* <img src="./img/timeoutWith.png" width="100%">
|
|
*
|
|
* `timeoutWith` is a variation of `timeout` operator. It behaves exactly the same,
|
|
* still accepting as a first argument either a number or a Date, which control - respectively -
|
|
* when values of source Observable should be emitted or when it should complete.
|
|
*
|
|
* The only difference is that it accepts a second, required parameter. This parameter
|
|
* should be an Observable which will be subscribed when source Observable fails any timeout check.
|
|
* So whenever regular `timeout` would emit an error, `timeoutWith` will instead start re-emitting
|
|
* values from second Observable. Note that this fallback Observable is not checked for timeouts
|
|
* itself, so it can emit values and complete at arbitrary points in time. From the moment of a second
|
|
* subscription, Observable returned from `timeoutWith` simply mirrors fallback stream. When that
|
|
* stream completes, it completes as well.
|
|
*
|
|
* Scheduler, which in case of `timeout` is provided as as second argument, can be still provided
|
|
* here - as a third, optional parameter. It still is used to schedule timeout checks and -
|
|
* as a consequence - when second Observable will be subscribed, since subscription happens
|
|
* immediately after failing check.
|
|
*
|
|
* @example <caption>Add fallback observable</caption>
|
|
* const seconds = Rx.Observable.interval(1000);
|
|
* const minutes = Rx.Observable.interval(60 * 1000);
|
|
*
|
|
* seconds.timeoutWith(900, minutes)
|
|
* .subscribe(
|
|
* value => console.log(value), // After 900ms, will start emitting `minutes`,
|
|
* // since first value of `seconds` will not arrive fast enough.
|
|
* err => console.log(err) // Would be called after 900ms in case of `timeout`,
|
|
* // but here will never be called.
|
|
* );
|
|
*
|
|
* @param {number|Date} due Number specifying period within which Observable must emit values
|
|
* or Date specifying before when Observable should complete
|
|
* @param {Observable<T>} withObservable Observable which will be subscribed if source fails timeout check.
|
|
* @param {Scheduler} [scheduler] Scheduler controlling when timeout checks occur.
|
|
* @return {Observable<T>} Observable that mirrors behaviour of source or, when timeout check fails, of an Observable
|
|
* passed as a second parameter.
|
|
* @method timeoutWith
|
|
* @owner Observable
|
|
*/
|
|
export function timeoutWith(due, withObservable, scheduler = async) {
|
|
return higherOrder(due, withObservable, scheduler)(this);
|
|
}
|
|
//# sourceMappingURL=timeoutWith.js.map
|