Angular单个组件中的多个订阅

Question

使用ng-busy时遇到问题。我的组件中有4或5个订阅。当我运行一个时，它们可以正常工作，但是当我同时运行所有时，订阅会彼此等待退订。简而言之，当所有方法结束其请求时，将显示加载组件。

NgBusyModule配置如下：

NgBusyModule.forRoot(
  new BusyConfig({
    message: 'Please wait...',
    backdrop: true,
    template: BusyComponent,
    delay: 0,
    minDuration: 0,
    wrapperClass: 'eng-busy'
  })
)

组件如下所示：

 ngOnInit() {
    this.getWorkPlaces();
    this.getPension();
 }

  getWorkPlaces() {
    this.workPlaceSubscription = this.cabinetService.getContracts().subscribe(
      workPlaces=> {
        this.workPlaces = workPlaces;
      }
    )
  }

  getPension() {
    this.pensionSubscription = this.cabinetService.getPension().subscribe(
      pension=> {
        this.pension = pension;
      }
    )
  }

HTML：

<div class="cabinet-data">
  <div [ngBusy]="workPlaceSubscription">
      workPlaces data
  </div>
  <div [ngBusy]="pensionSubscription">
      pension data
  </div>
</div>

如何将订阅配置为互不依赖？