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55 lines
2.2 KiB
55 lines
2.2 KiB
4 years ago
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import { MonoTypeOperatorFunction, SchedulerLike } from '../types';
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export interface ShareReplayConfig {
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bufferSize?: number;
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windowTime?: number;
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refCount: boolean;
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scheduler?: SchedulerLike;
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}
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/**
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* Share source and replay specified number of emissions on subscription.
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*
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* This operator is a specialization of `replay` that connects to a source observable
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* and multicasts through a `ReplaySubject` constructed with the specified arguments.
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* A successfully completed source will stay cached in the `shareReplayed observable` forever,
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* but an errored source can be retried.
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*
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* ## Why use shareReplay?
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* You generally want to use `shareReplay` when you have side-effects or taxing computations
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* that you do not wish to be executed amongst multiple subscribers.
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* It may also be valuable in situations where you know you will have late subscribers to
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* a stream that need access to previously emitted values.
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* This ability to replay values on subscription is what differentiates {@link share} and `shareReplay`.
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*
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* 
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*
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* ## Example
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* ```ts
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* import { interval } from 'rxjs';
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* import { shareReplay, take } from 'rxjs/operators';
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*
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* const obs$ = interval(1000);
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* const shared$ = obs$.pipe(
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* take(4),
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* shareReplay(3)
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* );
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* shared$.subscribe(x => console.log('source A: ', x));
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* shared$.subscribe(y => console.log('source B: ', y));
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*
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* ```
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*
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* @see {@link publish}
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* @see {@link share}
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* @see {@link publishReplay}
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*
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* @param {Number} [bufferSize=Number.POSITIVE_INFINITY] Maximum element count of the replay buffer.
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* @param {Number} [windowTime=Number.POSITIVE_INFINITY] Maximum time length of the replay buffer in milliseconds.
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* @param {Scheduler} [scheduler] Scheduler where connected observers within the selector function
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* will be invoked on.
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* @return {Observable} An observable sequence that contains the elements of a sequence produced
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* by multicasting the source sequence within a selector function.
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* @method shareReplay
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* @owner Observable
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*/
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export declare function shareReplay<T>(config: ShareReplayConfig): MonoTypeOperatorFunction<T>;
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export declare function shareReplay<T>(bufferSize?: number, windowTime?: number, scheduler?: SchedulerLike): MonoTypeOperatorFunction<T>;
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