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authorPinapelz <yukais@pinapelz.com>2025-06-29 11:49:28 -0700
committerPinapelz <yukais@pinapelz.com>2025-06-29 11:49:28 -0700
commitd55b767039605256c736166a942a9138e3eacfd7 (patch)
tree947063b634c50d438a794325f13275e134aa5993 /node_modules/rxjs/src/internal/operators/refCount.ts
parent864ce67d89c77d8ef9c3361f80d619853abcf91c (diff)
remove dev node_modules (oops)
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-import { ConnectableObservable } from '../observable/ConnectableObservable';
-import { Subscription } from '../Subscription';
-import { MonoTypeOperatorFunction } from '../types';
-import { operate } from '../util/lift';
-import { createOperatorSubscriber } from './OperatorSubscriber';
-
-/**
- * Make a {@link ConnectableObservable} behave like a ordinary observable and automates the way
- * you can connect to it.
- *
- * Internally it counts the subscriptions to the observable and subscribes (only once) to the source if
- * the number of subscriptions is larger than 0. If the number of subscriptions is smaller than 1, it
- * unsubscribes from the source. This way you can make sure that everything before the *published*
- * refCount has only a single subscription independently of the number of subscribers to the target
- * observable.
- *
- * Note that using the {@link share} operator is exactly the same as using the `multicast(() => new Subject())` operator
- * (making the observable hot) and the *refCount* operator in a sequence.
- *
- * ![](refCount.png)
- *
- * ## Example
- *
- * In the following example there are two intervals turned into connectable observables
- * by using the *publish* operator. The first one uses the *refCount* operator, the
- * second one does not use it. You will notice that a connectable observable does nothing
- * until you call its connect function.
- *
- * ```ts
- * import { interval, tap, publish, refCount } from 'rxjs';
- *
- * // Turn the interval observable into a ConnectableObservable (hot)
- * const refCountInterval = interval(400).pipe(
- * tap(num => console.log(`refCount ${ num }`)),
- * publish(),
- * refCount()
- * );
- *
- * const publishedInterval = interval(400).pipe(
- * tap(num => console.log(`publish ${ num }`)),
- * publish()
- * );
- *
- * refCountInterval.subscribe();
- * refCountInterval.subscribe();
- * // 'refCount 0' -----> 'refCount 1' -----> etc
- * // All subscriptions will receive the same value and the tap (and
- * // every other operator) before the `publish` operator will be executed
- * // only once per event independently of the number of subscriptions.
- *
- * publishedInterval.subscribe();
- * // Nothing happens until you call .connect() on the observable.
- * ```
- *
- * @return A function that returns an Observable that automates the connection
- * to ConnectableObservable.
- * @see {@link ConnectableObservable}
- * @see {@link share}
- * @see {@link publish}
- * @deprecated Replaced with the {@link share} operator. How `share` is used
- * will depend on the connectable observable you created just prior to the
- * `refCount` operator.
- * Details: https://rxjs.dev/deprecations/multicasting
- */
-export function refCount<T>(): MonoTypeOperatorFunction<T> {
- return operate((source, subscriber) => {
- let connection: Subscription | null = null;
-
- (source as any)._refCount++;
-
- const refCounter = createOperatorSubscriber(subscriber, undefined, undefined, undefined, () => {
- if (!source || (source as any)._refCount <= 0 || 0 < --(source as any)._refCount) {
- connection = null;
- return;
- }
-
- ///
- // Compare the local RefCountSubscriber's connection Subscription to the
- // connection Subscription on the shared ConnectableObservable. In cases
- // where the ConnectableObservable source synchronously emits values, and
- // the RefCountSubscriber's downstream Observers synchronously unsubscribe,
- // execution continues to here before the RefCountOperator has a chance to
- // supply the RefCountSubscriber with the shared connection Subscription.
- // For example:
- // ```
- // range(0, 10).pipe(
- // publish(),
- // refCount(),
- // take(5),
- // )
- // .subscribe();
- // ```
- // In order to account for this case, RefCountSubscriber should only dispose
- // the ConnectableObservable's shared connection Subscription if the
- // connection Subscription exists, *and* either:
- // a. RefCountSubscriber doesn't have a reference to the shared connection
- // Subscription yet, or,
- // b. RefCountSubscriber's connection Subscription reference is identical
- // to the shared connection Subscription
- ///
-
- const sharedConnection = (source as any)._connection;
- const conn = connection;
- connection = null;
-
- if (sharedConnection && (!conn || sharedConnection === conn)) {
- sharedConnection.unsubscribe();
- }
-
- subscriber.unsubscribe();
- });
-
- source.subscribe(refCounter);
-
- if (!refCounter.closed) {
- connection = (source as ConnectableObservable<T>).connect();
- }
- });
-}
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