so#43512119

components.progress-displayer-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  isLongJobRunning: Ember.computed('result', function(){
    return this.get('result') === null;
  }),
  isLongJobNeverStarted: Ember.computed('result', function(){
    return this.get('result') === undefined;
  }),
  isLongJobFinished: Ember.computed('result', function(){
    return Ember.isPresent(this.get('result'));
  }),
  mockRemoteCallService: Ember.inject.service(),
  actions: {
    startLongJob() {
    	this.set('result', null); this.get('mockRemoteCallService').doLongJob().then((result)=>this.set('result', result));
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',

});

services.mock-remote-call-service.js

import Ember from 'ember';

export default Ember.Service.extend({
  updateProgress(percentage) {
    this.set('percentage', `${100*percentage}%`);
  },
  
  doLongJob() {
  	this.updateProgress(0);
    let that = this;
      
    return new Ember.RSVP.Promise(
      function (resolve, reject) {
        function progress(count){
          that.updateProgress(count/10);
        }
        
        let count = 0;
        
        function timeout() {
          window.setTimeout(function() {
            count++;
            if (count < 11) {
							progress(count); 
              timeout();
            } else {
              resolve(`Data returned ${Math.random()}`);
            }
          }, 200);
        }
        
        timeout();
      });
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}

{{progress-displayer-component}}
<br>
<br>

templates.components.progress-displayer-component.hbs

{{yield}}
{{#if isLongJobRunning}}
	The progress is at:{{mockRemoteCallService.percentage}}
{{/if}}
<br>
{{#unless isLongJobRunning}}
  <button onclick={{action 'startLongJob'}}>Start New Long Job</button>
{{/unless}}
<br>
{{#if isLongJobFinished}}
	Remote call result is: {{result}}
{{/if}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}