Managing numerous subscriptions to private subjects that are revealed by utilizing the asObservable() method

I'm using a familiar approach where an Angular service has a private Subject that provides a public Observable like this:

private exampleSubject = new Subject<number>();
example$ = this.exampleSubject.asObservable();

In my particular situation, it is logical to keep the subject private, but how can I allow multiple subscribers?

In simpler terms, subjects are multicasts while observers are single casts. Is there a way to have a multicast observable without allowing external components to use .next on the subject?

angulartypescriptrxjs

Answer №1

This might not directly address your query, but I believe implementing a shareReplay(1) could assist you in creating a multicast observable.

You could try something along these lines:

import { shareReplay } from 'rxjs/operators';
....
private mySubject = new Subject<number>();
myObservable$ = this.mySubject.asObservable().pipe(shareReplay(1));

Ideally, your myObservable$ stream is more intricate than the example provided. The purpose of using shareReplay is to avoid redundant processing for multiple subscribers, thereby enhancing performance.

Upon subscribing to myObservable$, it will replay an observable (making it hot), which may lead to unintended effects. Remember to always unsubscribe upon destruction to prevent any such consequences.

You can achieve this by utilizing the takeUntil operator.

this.someOther$ = this.myObservable$.pipe(
  takeUntil(this.shutdownSubject),
);

To learn more about the shareReplay operator, visit this resource

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