Slow response + data proxy

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Randomly Slow Route Demo with bypassing setupController'
});

controllers.slow-route.js

import Ember from 'ember';

export default Ember.Controller.extend({
});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('slow-route', {path: '/'});
});

export default Router;

routes.slow-route.js

import Ember from 'ember';

const API = [
  {
    data: [1, 2, 3],
    responseTime: 100
  }, {
    data: [100, 200, 300],
    responseTime: 1000
  }, {
    data: [1000, 2000, 3000],
    responseTime: 500
  }];

const jobListDataTemplate =  Ember.Object.extend({
  jobs: null,
  totalJobCount: 0,
  currentPage: 1,
  isLoading: true,
  orderBy: [{field: 'timestamp', order: 'desc'}],
  lastLoadRequest: 0,

  totalPages: Ember.computed('totalJobCount', function () {
    return Math.ceil(this.get('totalJobCount') / RECORDS_PER_PAGE);
  }).readOnly()
});

export default Ember.Route.extend({
  dataVersion: 0,
  
  jobListData: Ember.computed(function () { return jobListDataTemplate.create(); }),

  
  _fetchData: function () {
    let controller = this.controllerFor('slow-route');
    let dataVersion = this.get('dataVersion');
    console.log('REFRESH DATA WITH VERSION', dataVersion, ' (IT WILL TAKE', API[dataVersion].responseTime, 'ms)');

    Ember.run.later(function () {
      let data = API[dataVersion].data;
      console.log('DATA VERSION', dataVersion, 'RETRIEVED: ', data);
      controller.set('model', data);
    }, API[dataVersion].responseTime);
  },
  
  _loadPage(page, requestedOrderField, requestedOrderDirection) {
    const jobListData = this.get('jobListData'),
          // increment the request when the request is made.  Only the most recent request will be honored.
          requestNumber = this.incrementProperty('jobListData.lastLoadRequest');

    const queryParams = {
      orderBy: requestedOrderField,
      order: requestedOrderDirection,
      offset: (page - 1) * RECORDS_PER_PAGE,
      limit: RECORDS_PER_PAGE
    };

    this.store.query('jobs/job', queryParams).then((jobs) => {
      // if the load numbers don't match, we shouldn't use this request because another was made.
      if (requestNumber === this.get('jobListData.lastLoadRequest')) {
        const meta = jobs.get('meta');
        jobListData.setProperties({
          jobs: jobs,
          totalJobCount: meta.total,
          currentPage: page,
          orderBy: [{field: requestedOrderField, order: requestedOrderDirection}],
          isLoading: false
        });

        if (!Ember.testing) {
          this.backgroundReload(page, requestedOrderField, requestedOrderDirection);
        }
      }
    }, (err) => {
      console.log('Request failed');
      jobListData.set('isLoading', false);
    });
  },
  
  backgroundReload: function (page, field, order) {
    this.set('lastTimer', Ember.run.later(this, '_loadPage', page, field, order, POLLING_FREQUENCY_MS));
  },
  
  cancelBackgroundReload: function () {
    let timer = this.get('lastTimer');
    if (timer) {
      Ember.run.cancel(timer);
      this.set('lastTimer', null);
    }
  },

  model() {
    const jobListData = this.get('jobListData');

    jobListData.setProperties({
      jobs: null,
      totalJobCount: 0,
      currentPage: 1
    });
    
    jobListData.set('isLoading', true);
    
    this._loadPage(1, orderByValue.field, orderByValue.order);
    
    return jobListData;
  },

  setupController(controller, model) {
    console.log('SETUP CONTROLLER WITH DATA', model);
    this._super(controller, model);
  },

  actions: {
    refresh() {
      this.set('dataVersion', 1);
      this.refresh();
      Ember.run.later(() => {
        this.set('dataVersion', 2);
        this.refresh();
      }, 100);
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<div>This demo shows how Ember handles (properly) data retrieval concurrency. Here's what you can do:</div>
<ul>
  <li>Load the page - you should see items 1, 2, 3</li>
  <li>Open browser console (in developer tools) to see debugging messages</li>
  <li>Click the Refresh button - you should see items 1000, 2000, 3000 even though obsolete items 100, 200, 300 are retrieved later</li>
  <li>Check the console - you should see that after obsolete data retrieval setupController is not called (which is correct)</li>
</ul>
<br>
{{outlet}}
<br>
<br>

templates.slow-route.hbs

<button class="refresher" {{action "refresh"}}>Refresh</button>
<hr>
<div>
  <span>Items:</span>
  <ul>
    {{#each content as |item i|}}
      <li class="item-{{i}}">{{item}}</li>
    {{/each}}
  </ul>
</div>

tests.acceptance.slow-route-test.js

import { test } from 'qunit';
import moduleForAcceptance from '../../tests/helpers/module-for-acceptance';

moduleForAcceptance('TODO: put something here');

test('visiting /', function(assert) {
  visit('/');

  andThen(function() {
    assert.equal(currentURL(), '/');
  });
  
  click('.refresher');
  
  andThen(function () {
    assert.equal(find('.item-0').text(), '1000', 'First element has correct value');
  });
});

tests.helpers.destroy-app.js

import Ember from 'ember';

export default function destroyApp(application) {
  Ember.run(application, 'destroy');
}

tests.helpers.module-for-acceptance.js

import { module } from 'qunit';
import Ember from 'ember';
import startApp from '../helpers/start-app';
import destroyApp from '../helpers/destroy-app';

const { RSVP: { Promise } } = Ember;

export default function(name, options = {}) {
  module(name, {
    beforeEach() {
      this.application = startApp();

      if (options.beforeEach) {
        return options.beforeEach.apply(this, arguments);
      }
    },

    afterEach() {
      let afterEach = options.afterEach && options.afterEach.apply(this, arguments);
      return Promise.resolve(afterEach).then(() => destroyApp(this.application));
    }
  });
}

tests.helpers.resolver.js

import Resolver from '../../resolver';
import config from '../../config/environment';

const resolver = Resolver.create();

resolver.namespace = {
  modulePrefix: config.modulePrefix,
  podModulePrefix: config.podModulePrefix
};

export default resolver;

tests.helpers.start-app.js

import Ember from 'ember';
import Application from '../../app';
import config from '../../config/environment';

const { run } = Ember;
const assign = Ember.assign || Ember.merge;

export default function startApp(attrs) {
  let application;

  let attributes = assign({rootElement: "#test-root"}, config.APP);
  attributes = assign(attributes, attrs); // use defaults, but you can override;

  run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

tests.test-helper.js

import resolver from './helpers/resolver';
import {
  setResolver
} from 'ember-qunit';

setResolver(resolver);

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "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"
  }
}