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node_modules/rxjs/src/operators/finalize.ts
38 строк
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EvgeniyBudaev
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17 фев 2020, 09:02
17 фев 2020, 09:02
bb6f06f
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import { Operator } from '../Operator'; import { Subscriber } from '../Subscriber'; import { Subscription, TeardownLogic } from '../Subscription'; import { Observable } from '../Observable'; import { MonoTypeOperatorFunction } from '../interfaces'; /** * Returns an Observable that mirrors the source Observable, but will call a specified function when * the source terminates on complete or error. * @param {function} callback Function to be called when source terminates. * @return {Observable} An Observable that mirrors the source, but will call the specified function on termination. * @method finally * @owner Observable */ export function finalize<T>(callback: () => void): MonoTypeOperatorFunction<T> { return (source: Observable<T>) => source.lift(new FinallyOperator(callback)); } class FinallyOperator<T> implements Operator<T, T> { constructor(private callback: () => void) { } call(subscriber: Subscriber<T>, source: any): TeardownLogic { return source.subscribe(new FinallySubscriber(subscriber, this.callback)); } } /** * We need this JSDoc comment for affecting ESDoc. * @ignore * @extends {Ignored} */ class FinallySubscriber<T> extends Subscriber<T> { constructor(destination: Subscriber<T>, callback: () => void) { super(destination); this.add(new Subscription(callback)); } }