| import { FromObservable } from '../observable/FromObservable'; |
| import { isArray } from '../util/isArray'; |
| import { OuterSubscriber } from '../OuterSubscriber'; |
| import { subscribeToResult } from '../util/subscribeToResult'; |
| /* tslint:enable:max-line-length */ |
| /** |
| * When any of the provided Observable emits an complete or error notification, it immediately subscribes to the next one |
| * that was passed. |
| * |
| * <span class="informal">Execute series of Observables no matter what, even if it means swallowing errors.</span> |
| * |
| * <img src="./img/onErrorResumeNext.png" width="100%"> |
| * |
| * `onErrorResumeNext` is an operator that accepts a series of Observables, provided either directly as |
| * arguments or as an array. If no single Observable is provided, returned Observable will simply behave the same |
| * as the source. |
| * |
| * `onErrorResumeNext` returns an Observable that starts by subscribing and re-emitting values from the source Observable. |
| * When its stream of values ends - no matter if Observable completed or emitted an error - `onErrorResumeNext` |
| * will subscribe to the first Observable that was passed as an argument to the method. It will start re-emitting |
| * its values as well and - again - when that stream ends, `onErrorResumeNext` will proceed to subscribing yet another |
| * Observable in provided series, no matter if previous Observable completed or ended with an error. This will |
| * be happening until there is no more Observables left in the series, at which point returned Observable will |
| * complete - even if the last subscribed stream ended with an error. |
| * |
| * `onErrorResumeNext` can be therefore thought of as version of {@link concat} operator, which is more permissive |
| * when it comes to the errors emitted by its input Observables. While `concat` subscribes to the next Observable |
| * in series only if previous one successfully completed, `onErrorResumeNext` subscribes even if it ended with |
| * an error. |
| * |
| * Note that you do not get any access to errors emitted by the Observables. In particular do not |
| * expect these errors to appear in error callback passed to {@link subscribe}. If you want to take |
| * specific actions based on what error was emitted by an Observable, you should try out {@link catch} instead. |
| * |
| * |
| * @example <caption>Subscribe to the next Observable after map fails</caption> |
| * Rx.Observable.of(1, 2, 3, 0) |
| * .map(x => { |
| * if (x === 0) { throw Error(); } |
| return 10 / x; |
| * }) |
| * .onErrorResumeNext(Rx.Observable.of(1, 2, 3)) |
| * .subscribe( |
| * val => console.log(val), |
| * err => console.log(err), // Will never be called. |
| * () => console.log('that\'s it!') |
| * ); |
| * |
| * // Logs: |
| * // 10 |
| * // 5 |
| * // 3.3333333333333335 |
| * // 1 |
| * // 2 |
| * // 3 |
| * // "that's it!" |
| * |
| * @see {@link concat} |
| * @see {@link catch} |
| * |
| * @param {...ObservableInput} observables Observables passed either directly or as an array. |
| * @return {Observable} An Observable that emits values from source Observable, but - if it errors - subscribes |
| * to the next passed Observable and so on, until it completes or runs out of Observables. |
| * @method onErrorResumeNext |
| * @owner Observable |
| */ |
| export function onErrorResumeNext(...nextSources) { |
| if (nextSources.length === 1 && isArray(nextSources[0])) { |
| nextSources = nextSources[0]; |
| } |
| return (source) => source.lift(new OnErrorResumeNextOperator(nextSources)); |
| } |
| /* tslint:enable:max-line-length */ |
| export function onErrorResumeNextStatic(...nextSources) { |
| let source = null; |
| if (nextSources.length === 1 && isArray(nextSources[0])) { |
| nextSources = nextSources[0]; |
| } |
| source = nextSources.shift(); |
| return new FromObservable(source, null).lift(new OnErrorResumeNextOperator(nextSources)); |
| } |
| class OnErrorResumeNextOperator { |
| constructor(nextSources) { |
| this.nextSources = nextSources; |
| } |
| call(subscriber, source) { |
| return source.subscribe(new OnErrorResumeNextSubscriber(subscriber, this.nextSources)); |
| } |
| } |
| class OnErrorResumeNextSubscriber extends OuterSubscriber { |
| constructor(destination, nextSources) { |
| super(destination); |
| this.destination = destination; |
| this.nextSources = nextSources; |
| } |
| notifyError(error, innerSub) { |
| this.subscribeToNextSource(); |
| } |
| notifyComplete(innerSub) { |
| this.subscribeToNextSource(); |
| } |
| _error(err) { |
| this.subscribeToNextSource(); |
| } |
| _complete() { |
| this.subscribeToNextSource(); |
| } |
| subscribeToNextSource() { |
| const next = this.nextSources.shift(); |
| if (next) { |
| this.add(subscribeToResult(this, next)); |
| } |
| else { |
| this.destination.complete(); |
| } |
| } |
| } |
| //# sourceMappingURL=onErrorResumeNext.js.map |