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PATH: usr / local / lib / node_modules / ghost-cli / node_modules / rxjs / src / internal / operators

import { Operator } from '../Operator';
import { Observable } from '../Observable';
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
import { ObservableInput, OperatorFunction, TeardownLogic } from '../types';

export function exhaust<T>(): OperatorFunction<ObservableInput<T>, T>;
export function exhaust<R>(): OperatorFunction<any, R>;

/**
 * Converts a higher-order Observable into a first-order Observable by dropping
 * inner Observables while the previous inner Observable has not yet completed.
 *
 * <span class="informal">Flattens an Observable-of-Observables by dropping the
 * next inner Observables while the current inner is still executing.</span>
 *
 * ![](exhaust.png)
 *
 * `exhaust` subscribes to an Observable that emits Observables, also known as a
 * higher-order Observable. Each time it observes one of these emitted inner
 * Observables, the output Observable begins emitting the items emitted by that
 * inner Observable. So far, it behaves like {@link mergeAll}. However,
 * `exhaust` ignores every new inner Observable if the previous Observable has
 * not yet completed. Once that one completes, it will accept and flatten the
 * next inner Observable and repeat this process.
 *
 * ## Example
 * Run a finite timer for each click, only if there is no currently active timer
 * ```ts
 * import { fromEvent, interval } from 'rxjs';
 * import { exhaust, map, take } from 'rxjs/operators';
 *
 * const clicks = fromEvent(document, 'click');
 * const higherOrder = clicks.pipe(
 *   map((ev) => interval(1000).pipe(take(5))),
 * );
 * const result = higherOrder.pipe(exhaust());
 * result.subscribe(x => console.log(x));
 * ```
 *
 * @see {@link combineAll}
 * @see {@link concatAll}
 * @see {@link switchAll}
 * @see {@link switchMap}
 * @see {@link mergeAll}
 * @see {@link exhaustMap}
 * @see {@link zipAll}
 *
 * @return {Observable} An Observable that takes a source of Observables and propagates the first observable
 * exclusively until it completes before subscribing to the next.
 * @method exhaust
 * @owner Observable
 */
export function exhaust<T>(): OperatorFunction<any, T> {
  return (source: Observable<T>) => source.lift(new SwitchFirstOperator<T>());
}

class SwitchFirstOperator<T> implements Operator<T, T> {
  call(subscriber: Subscriber<T>, source: any): TeardownLogic {
    return source.subscribe(new SwitchFirstSubscriber(subscriber));
  }
}

/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class SwitchFirstSubscriber<T> extends OuterSubscriber<T, T> {
  private hasCompleted: boolean = false;
  private hasSubscription: boolean = false;

constructor(destination: Subscriber<T>) {
    super(destination);
  }

protected _next(value: T): void {
    if (!this.hasSubscription) {
      this.hasSubscription = true;
      this.add(subscribeToResult(this, value));
    }
  }

protected _complete(): void {
    this.hasCompleted = true;
    if (!this.hasSubscription) {
      this.destination.complete();
    }
  }

notifyComplete(innerSub: Subscription): void {
    this.remove(innerSub);
    this.hasSubscription = false;
    if (this.hasCompleted) {
      this.destination.complete();
    }
  }
}

[-] toArray.ts [edit]
[-] window.ts [edit]
[-] retry.ts [edit]
[-] mergeAll.ts [edit]
[-] windowWhen.ts [edit]
[-] every.ts [edit]
[-] timeout.ts [edit]
[-] debounceTime.ts [edit]
[-] index.ts [edit]
[-] takeWhile.ts [edit]
[-] audit.ts [edit]
[-] reduce.ts [edit]
[-] mapTo.ts [edit]
[-] count.ts [edit]
[-] debounce.ts [edit]
[-] throwIfEmpty.ts [edit]
[-] auditTime.ts [edit]
[-] scan.ts [edit]
[-] switchAll.ts [edit]
[-] map.ts [edit]
[-] bufferCount.ts [edit]
[-] mergeScan.ts [edit]
[-] publish.ts [edit]
[-] min.ts [edit]
[+] ..
[-] publishReplay.ts [edit]
[-] bufferTime.ts [edit]
[-] share.ts [edit]
[-] repeat.ts [edit]
[-] distinct.ts [edit]
[-] concatMapTo.ts [edit]
[-] buffer.ts [edit]
[-] concatMap.ts [edit]
[-] max.ts [edit]
[-] partition.ts [edit]
[-] observeOn.ts [edit]
[-] bufferWhen.ts [edit]
[-] dematerialize.ts [edit]
[-] throttle.ts [edit]
[-] groupBy.ts [edit]
[-] withLatestFrom.ts [edit]
[-] exhaust.ts [edit]
[-] exhaustMap.ts [edit]
[-] retryWhen.ts [edit]
[-] zipAll.ts [edit]
[-] find.ts [edit]
[-] mergeMap.ts [edit]
[-] single.ts [edit]
[-] last.ts [edit]
[-] combineLatest.ts [edit]
[-] publishLast.ts [edit]
[-] pluck.ts [edit]
[-] pairwise.ts [edit]
[-] distinctUntilChanged.ts [edit]
[-] timeInterval.ts [edit]
[-] shareReplay.ts [edit]
[-] skipUntil.ts [edit]
[-] findIndex.ts [edit]
[-] windowToggle.ts [edit]
[-] startWith.ts [edit]
[-] timeoutWith.ts [edit]
[-] concat.ts [edit]
[-] materialize.ts [edit]
[-] timestamp.ts [edit]
[-] onErrorResumeNext.ts [edit]
[-] subscribeOn.ts [edit]
[-] takeUntil.ts [edit]
[-] skipLast.ts [edit]
[-] throttleTime.ts [edit]
[-] mergeMapTo.ts [edit]
[-] multicast.ts [edit]
[-] merge.ts [edit]
[-] takeLast.ts [edit]
[-] delayWhen.ts [edit]
[-] sampleTime.ts [edit]
[-] tap.ts [edit]
[-] take.ts [edit]
[-] sample.ts [edit]
[-] filter.ts [edit]
[-] skip.ts [edit]
[-] expand.ts [edit]
[-] publishBehavior.ts [edit]
[-] sequenceEqual.ts [edit]
[-] ignoreElements.ts [edit]
[-] catchError.ts [edit]
[-] endWith.ts [edit]
[-] refCount.ts [edit]
[-] windowCount.ts [edit]
[-] defaultIfEmpty.ts [edit]
[-] windowTime.ts [edit]
[-] switchMapTo.ts [edit]
[-] switchMap.ts [edit]
[-] delay.ts [edit]
[-] bufferToggle.ts [edit]
[-] repeatWhen.ts [edit]
[-] concatAll.ts [edit]
[-] first.ts [edit]
[-] zip.ts [edit]
[-] elementAt.ts [edit]
[-] skipWhile.ts [edit]
[-] race.ts [edit]
[-] finalize.ts [edit]
[-] combineAll.ts [edit]
[-] distinctUntilKeyChanged.ts [edit]
[-] isEmpty.ts [edit]