work.suroh.tk/node_modules/rxjs/operators/onErrorResumeNext.js

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2019-12-02 12:22:45 +00:00
"use strict";
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var FromObservable_1 = require('../observable/FromObservable');
var isArray_1 = require('../util/isArray');
var OuterSubscriber_1 = require('../OuterSubscriber');
var subscribeToResult_1 = require('../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
*/
function onErrorResumeNext() {
var nextSources = [];
for (var _i = 0; _i < arguments.length; _i++) {
nextSources[_i - 0] = arguments[_i];
}
if (nextSources.length === 1 && isArray_1.isArray(nextSources[0])) {
nextSources = nextSources[0];
}
return function (source) { return source.lift(new OnErrorResumeNextOperator(nextSources)); };
}
exports.onErrorResumeNext = onErrorResumeNext;
/* tslint:enable:max-line-length */
function onErrorResumeNextStatic() {
var nextSources = [];
for (var _i = 0; _i < arguments.length; _i++) {
nextSources[_i - 0] = arguments[_i];
}
var source = null;
if (nextSources.length === 1 && isArray_1.isArray(nextSources[0])) {
nextSources = nextSources[0];
}
source = nextSources.shift();
return new FromObservable_1.FromObservable(source, null).lift(new OnErrorResumeNextOperator(nextSources));
}
exports.onErrorResumeNextStatic = onErrorResumeNextStatic;
var OnErrorResumeNextOperator = (function () {
function OnErrorResumeNextOperator(nextSources) {
this.nextSources = nextSources;
}
OnErrorResumeNextOperator.prototype.call = function (subscriber, source) {
return source.subscribe(new OnErrorResumeNextSubscriber(subscriber, this.nextSources));
};
return OnErrorResumeNextOperator;
}());
var OnErrorResumeNextSubscriber = (function (_super) {
__extends(OnErrorResumeNextSubscriber, _super);
function OnErrorResumeNextSubscriber(destination, nextSources) {
_super.call(this, destination);
this.destination = destination;
this.nextSources = nextSources;
}
OnErrorResumeNextSubscriber.prototype.notifyError = function (error, innerSub) {
this.subscribeToNextSource();
};
OnErrorResumeNextSubscriber.prototype.notifyComplete = function (innerSub) {
this.subscribeToNextSource();
};
OnErrorResumeNextSubscriber.prototype._error = function (err) {
this.subscribeToNextSource();
};
OnErrorResumeNextSubscriber.prototype._complete = function () {
this.subscribeToNextSource();
};
OnErrorResumeNextSubscriber.prototype.subscribeToNextSource = function () {
var next = this.nextSources.shift();
if (next) {
this.add(subscribeToResult_1.subscribeToResult(this, next));
}
else {
this.destination.complete();
}
};
return OnErrorResumeNextSubscriber;
}(OuterSubscriber_1.OuterSubscriber));
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