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Last change
on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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File size:
898 bytes
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| 1 | import { Observable } from '../Observable';
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| 2 | import { from } from './from';
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| 3 | import { EMPTY } from './empty';
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| 4 | export function using(resourceFactory, observableFactory) {
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| 5 | return new Observable(subscriber => {
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| 6 | let resource;
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| 7 | try {
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| 8 | resource = resourceFactory();
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| 9 | }
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| 10 | catch (err) {
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| 11 | subscriber.error(err);
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| 12 | return undefined;
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| 13 | }
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| 14 | let result;
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| 15 | try {
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| 16 | result = observableFactory(resource);
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| 17 | }
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| 18 | catch (err) {
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| 19 | subscriber.error(err);
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| 20 | return undefined;
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| 21 | }
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| 22 | const source = result ? from(result) : EMPTY;
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| 23 | const subscription = source.subscribe(subscriber);
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| 24 | return () => {
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| 25 | subscription.unsubscribe();
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| 26 | if (resource) {
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| 27 | resource.unsubscribe();
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| 28 | }
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| 29 | };
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| 30 | });
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| 31 | }
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| 32 | //# sourceMappingURL=using.js.map |
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