Trying RxJS cache operator

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

/* Styles go here */

### Angular2 Starter Plunker - Typescript - RC.0

A simple plunker demonstrating Angular2 usage:
- Uses SystemJS + TypeScript to compile on the fly
- Includes binding, directives, http, pipes, and DI usage.

For opening

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    
    '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',
    
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.0.2/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, NgModule} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {Observer} from 'rxjs/Observer';
import {Observable} from 'rxjs/Observable';
import {Subscription} from 'rxjs/Subscription';
import 'rxjs/add/observable/fromEvent';
import 'rxjs/add/observable/of';
import 'rxjs/add/operator/share';
import 'rxjs/add/operator/race';
import 'rxjs/add/operator/finally';
import 'rxjs/add/operator/cache';
import 'rxjs/add/operator/publishReplay';

@Component({
  selector: 'my-app',
  template: `
    XXXX
    <button (click)="update()">update!</button>
    <button (click)="close()">close!</button>
    <div>
      {{value1}},
      {{value2}},
      {{value3}},
      {{value4}}
    </div>
  `
})
export class App {
  obs$: Observable<any>;
  observer: Observer;

  ngOnInit() {
    this.obs$ = Observable.create(observer => {
      console.log(1110); // XXX
      observer.next('mario');
    })
    .cache(undefined, 2000);
    // .publishReplay().refCount();

    let sub1 = this.obs$.subscribe(v => {
      this.value1 = v;
    });

    let sub2 = this.obs$.subscribe(v => {
      this.value2 = v;
    });
    
    let sub3, sub4;
    
    window.setTimeout(() => {
      sub1.unsubscribe();
      sub3 = this.obs$.subscribe(v => {
        this.value3 = v;
      });
      console.log(1111, 'unsub 1');
    }, 1000);
    
    window.setTimeout(() => {
      sub2.unsubscribe();
      console.log(1112, 'unsub 2');
    }, 2000);
    
    window.setTimeout(() => {
      sub3.unsubscribe();
      console.log(1113, 'unsub 3');
    }, 3000);
    
    window.setTimeout(() => {
      sub4 = this.obs$.subscribe(v => {
        this.value4 = v;
      });
      console.log(1114, 'unsub 4');
    }, 4000);
  }
  
  update() {
    // this.observer.next((new Date()).toString());
  }
  
  close() {
    this.observer.complete();
  }
}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App ],
  bootstrap: [ App ]
})
export class AppModule {}