ember-concurrency__001

controllers.application.js

import Ember from 'ember';
import { task, timeout } from 'ember-concurrency';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  status: "Waiting to start",

  parentTask: task(function * () {
    this.set('status', "1. Parent: one moment...");
    yield timeout(1000);
    let value = yield this.get('childTask').perform();
    this.set('status', `5. Parent: child says "${value}"`);
    yield timeout(1000);
    this.set('status', "6. Done!");
  }).restartable(),

  childTask: task(function * () {
    this.set('status', "2. Child: one moment...");
    yield timeout(1000);
    let value = yield this.get('grandchildTask').perform();
    this.set('status', `4. Child: grandchild says "${value}"`);
    yield timeout(1000);
    return "What's up";
  }),

  grandchildTask: task(function * () {
    this.set('status', "3. Grandchild: one moment...");
    yield timeout(1000);
    return "Hello";
  }),
  
  actions: {
    cancel(task) {
     task.cancel(); 
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
  <h5>{{status}}</h5>

  <ul>
    <li>Parent Task:     {{parentTask.state}}</li>
    <li>Child Task:      {{childTask.state}} <button {{action "cancel" childTask}}>Cancel</button></li>
    <li>Grandchild Task: {{grandchildTask.state}}</li>
  </ul>

  <button onclick={{perform parentTask}}>
    {{#if parentTask.isRunning}}
      Restart Parent Task
    {{else}}
      Perform Parent Task
    {{/if}}
  </button>
<br>
<br>

twiddle.json

{
  "version": "0.8.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.0",
    "ember-data": "2.5.1",
    "ember-template-compiler": "2.5.0",
    "babel-polyfill":"https://cdn.rawgit.com/nicksrandall/babel-polyfill/master/browser-polyfill.js"
  },
  "addons": {
    "ember-concurrency": "0.6.0"
  }
}