Angular 2和RxJS 5 Observable.share（）

Question

使用Angular 2 RC4运行RxJS 5 beta 6，我很难搞清楚为什么我的observable不会在订阅者之间共享。我试着仔细按照说明无济于事。我的组件位于下方，但您可以看到它正常运行at this Plunker

模板

<div> Toggle sub 1:
   <button (click)="subOne=!subOne">{{subOne?'One is ON ':'One is OFF'}}</button>
</div>
<div> Toggle sub 2:
   <button (click)="subTwo=!subTwo">{{subTwo?'Two is ON ':'Two is OFF'}}</button>
</div>
<ul><li *ngFor="let L of log.slice(-16)">{{L}}</li></ul>

类

_subOne = false;
get subOne(){return this._subOne};
set subOne(val){
    this._subOne = val;
    //if set to true, subscribe
    if(val) this.subscriptions.one =
        this.source().subscribe(d=>this.print('One sees '+d));

    //else, unsubscribe
    else this.subscriptions.one.unsubscribe();
}

_subTwo = false;
get subTwo(){return this._subTwo};
set subTwo(val){
    this._subTwo = val;
    if(val) this.subscriptions.two =
        this.source().subscribe(d=>this.print('Two sees '+d));
    else this.subscriptions.two.unsubscribe();
}

subscriptions = {'one':null,'two':null};
source(){
    return Observable.interval(3000)
        .do(()=>this.print("*******EMITTING*******")).share();
}

print(value){this.log.push(value);}
log=[];

输出

我期望订阅者共享相同的observable，因为我使用.share()运算符。为什么不呢？

Answer 1

我认为这是因为每次调用source方法时都会创建一个observable。您需要订阅相同的可观察实例。

source:Observable = this.source(); // <-----

set subOne(val){
  this._subOne = val;
  if(val) this.subscriptions.one =
    this.source.subscribe(d=>this.print('One sees '+d)); // <-----
  else this.subscriptions.one.unsubscribe();
}