angular - JhiEventManager 多个订阅

Question

JhiEventManager 是否允许多个订阅，还是我应该为每个事件专门订阅？ JhiEventManager 的 destroy() 方法也会处理多个订阅吗？

export class SomeComponent implements OnInit, OnDestroy {
  eventSubscriber?: Subscription;
 
  constructor(protected eventManager: JhiEventManager) {
  }

  ngOnInit(): void {
    this.registerChanges();
  }

  registerChanges(): void {
    this.eventSubscriber = this.eventManager.subscribe('first EntityListModification', () => this.someaction());
    // ??? chain this to the same eventSubscriber ???
    this.eventManager.subscribe('secondEntityListModification', () => this.someaction());
  }

  ngOnDestroy(): void {
    if (this.eventSubscriber) {
      this.eventManager.destroy(this.eventSubscriber);
    }
  }

提前非常感谢

Answer 1

基于current implementation of JhiEventManager可以在一个订阅中处理一些事情:

export class SomeComponent implements OnInit, OnDestroy {
  subscription?: Subscription;

  constructor(protected eventManager: JhiEventManager) {}

  ngOnInit(): void {
    this.registerAllEvents();
  }

  registerAllEvents(): void {
    this.subscription = this.eventManager.subscribe('event1', () => this.loadAll());
    this.subscription.add(this.eventManager.subscribe('event2', () => this.loadAll()));
    this.subscription.add(this.eventManager.subscribe('event3', () => this.loadAll()));
    ...
    this.subscription.add(this.eventManager.subscribe('eventN', () => this.loadAll()));
  }

  ngOnDestroy(): void {
    if (this.subscription) {
      this.eventManager.destroy(this.subscription);
    }
  }

请引用https://rxjs-dev.firebaseapp.com/guide/subscription详细说明:

call to an unsubscribe() of one Subscription may unsubscribe multiple Subscriptions. You can do this by "adding" one subscription into another: