Synchronizing subscriptions

Question

Synchronizing subscriptions

Currently, I am engaged in a project for my organization and am strictly upholding the Non-Disclosure Agreement (NDA) that I have signed. In adherence to this confidentiality agreement, I present the following code snippet devoid of any sensitive details:

toggleLoadingAnimation()
Subscription1()
Subscription2()
…
Subscription10()

toggleLoadingAnimation()

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.10/angular.min.js"></script>

The issue at hand pertains to all the Subscription methods being asynchronous, each one resembling the following structure:

this.randomFieldSubscription = this.randomService.randomEntityList.value$.subscribe(entityList => {this.entityList = entityList})

Upon execution of .subscribe, a request is also sent to the server within the randomService.

I am grappling with how to ensure that the second toggleLoadingAnimation() is triggered only after completion of all preceding Subscriptions and once responses from the server are fully received.

javascript angular typescript http asynchronous

Answer 1

Answer №1

If you want to learn about the forkJoin method in RxJS, you can use it like this:

Start by converting your Observable into a Promise using firstValueFrom

toggleLoadingAnimationPromise() {
    return firstValueFrom(this.randomService.randomEntityList());
  }

Subscription1Promise() {
    return firstValueFrom(this.randomService.Subscription1());
  }

forkJoin({
      toggleLoadingAnimation: this.toggleLoadingAnimationPromise(),
      Subscription1: this.Subscription1Promise(),
      Subscription2: this.Subscription2Promise(),
    }).subscribe(({ toggleLoadingAnimation, Subscription1, Subscription2 }) => {
      //your code logic here
      //...
      //your call
      toggleLoadingAnimationPromise().then((data)=>{
       //your code logic
      })
    })
  }

Answer 2

If you want to learn about the forkJoin method in RxJS, you can use it like this:

Start by converting your Observable into a Promise using firstValueFrom

toggleLoadingAnimationPromise() {
    return firstValueFrom(this.randomService.randomEntityList());
  }

Subscription1Promise() {
    return firstValueFrom(this.randomService.Subscription1());
  }

forkJoin({
      toggleLoadingAnimation: this.toggleLoadingAnimationPromise(),
      Subscription1: this.Subscription1Promise(),
      Subscription2: this.Subscription2Promise(),
    }).subscribe(({ toggleLoadingAnimation, Subscription1, Subscription2 }) => {
      //your code logic here
      //...
      //your call
      toggleLoadingAnimationPromise().then((data)=>{
       //your code logic
      })
    })
  }

Synchronizing subscriptions

Answer №1

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