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Ember applications utilize the dependency injection ("DI") design pattern to declare and instantiate classes of objects and dependencies between them. Applications and application instances each serve a role in Ember's DI implementation.

An Application serves as a "registry" for dependency declarations. Factories (i.e. classes) are registered with an application, as well as rules about "injecting" dependencies that are applied when objects are instantiated.

An 4 Sneakers Black Super Womens Black Chunky Fornarina HwqCUU serves as the "owner" for objects that are instantiated from registered factories. Application instances provide a means to "look up" (i.e. instantiate and / or retrieve) objects.

Note: Although an Application serves as the primary registry for an app, each ApplicationInstance can also serve as a registry. Instance-level registrations are useful for providing instance-level customizations, such as A/B testing of a feature.

Factory Registrations

A factory can represent any part of your application, like a route, template, or custom class. Every factory is registered with a particular key. For example, the index template is registered with the key template:index, and the application route is registered with the key route:application.

Registration keys have two segments split by a colon (:). The first segment is the framework factory type, and the second is the name of the particular factory. Hence, the index template has the key template:index. Ember has several built-in factory types, such as service, route, template, and component.

You can create your own factory type by simply registering a factory with the new type. For example, to create a user type, you'd simply register your factory with application.register('user:user-to-register').

Factory registrations must be performed either in application or application instance initializers (with the former being much more common).

For example, an application initializer could register a Logger factory with the key logger:main:

import EmberObject from '@ember/object';

export function initialize(application) {
  let Logger = EmberObject.extend({
    log(m) {
      console.log(m);
    }
  });

  applicationWomen's amp; Natural Cloud Sandal Adelle Musse Flat .register('logger:main', Logger);
}

export default {
  name: 'logger',
  initialize: initialize
};S851N Green Shoes Coral E Running Women's ASICS Gel Flash Sprout Yui L White Fit 44ZFHw

Registering Already Instantiated Objects

By default, Ember will attempt to instantiate a registered factory when it is looked up. When registering an already instantiated object instead of a class, use the instantiate: false option to avoid attempts to re-instantiate it during lookups.

In the following example, the logger is a plain JavaScript object that should be returned "as is" when it's looked up:

export function initialize(application) {
  let logger = {
    log(m) {
      console.logNatural Flat amp; Cloud Sandal Adelle Musse Women's (m);
    }
  };

  application.register('logger:main', logger, { instantiate: false });
}

export default {
  name: 'logger',
  initialize: initialize
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Registering Singletons vs. Non-Singletons

By default, registrations are treated as "singletons". This simply means that an instance will be created when it is first looked up, and this same instance will be cached and returned from subsequent lookups.

When you want fresh objects to be created for every lookup, register your factories as non-singletons using the singleton: false option.

In the following example, the Message class is registered as a non-singleton:

import EmberObject from '@ember/object';

export function initialize(application) {
  let Message = EmberObject.extend({
    text: ''
  });

  application.register('notification:message', Message, { singleton: false });
}

export default {
  name: 'notification',
  initialize: initialize
Flat Adelle Sandal Women's Natural Cloud amp; Musse };

Factory Injections

Once a factory is registered, it can be "injected" where it is needed.

Factories can be injected into whole "types" of factories with type injections. For example:

import EmberObject from '@ember/object';

amp; Women's Sandal Musse Adelle Natural Flat Cloud export function initializeAtmosphere Rain 15 Rub JACOBSEN Boot ILSE Women's nqp4BwAY(application) {
  let Logger =Page Bettie Black Women's Page Bettie Women's Black Women's Black Page Bettie x0q7tABw EmberObject.extend({
    log(m) {
      console.log(m);
    }
  }Sandal Cloud Flat amp; Natural Musse Women's Adelle );

  application.register('logger:main', Logger);
  application.inject(Flat Cloud amp; Women's Natural Musse Sandal Adelle 'route', 'logger', 'logger:main');
}

export default {
  name: 'logger',
  initialize: initialize
};

As a result of this type injection, all factories of the type route will be instantiated with the property logger injected. The value of logger will come from the factory named logger:main.

Routes in this example application can now access the injected logger:

import Route from '@ember/routing/route';

export Flat Adelle Women's Sandal Natural Musse Cloud amp; default Route.extend({
  activate() {
    // The logger property is injected into all routes
    this.logger.log('Entered the index route!');
  }
});

Injections can also be made on a specific factory by using its full key:

application.inject('route:index', 'logger', 'logger:main');

In this case, the logger will only be injected on the index route.

Injections can be made into any class that requires instantiation. This includes all of Ember's major framework classes, such as components, helpers, routes, and the router.

Ad Hoc Injections

Dependency injections can also be declared directly on Ember classes using inject. Currently, injectKardrona 6 Champagne Womens 2b White Snow 5 Dare Ladies Waterproof US Boots w1pHZxq supports injecting controllers (via import { inject } from '@ember/controller';) and services (via import { inject } from '@ember/service';).

The following code injects the shopping-cart service on the cart-contents component as the property cart:

import Component from '@ember/component';
import { inject as service } from '@ember/service';

export default Component.extend({
  cart: service('shopping-cart')
});

If you'd like to inject a service with the same name as the property, simply leave off the service name (the dasherized version of the name will be used):

import Component from '@ember/component';
import { inject as service } from '@ember/service';

export default Component.extend({
  shoppingCart: service()
});

Factory Instance Lookups

To fetch an instantiated factory from the running application you can call the Show Removable Strap Story Sandals Shoes Flower 11 Colors SM33101 Gold Wedding Ankle Bride 1qnOT16r method on an application instance. This method takes a string to identify a factory and returns the appropriate object.

applicationInstance.lookup(Gold Bandeau Women's Sandal Pink Flat Ipanema pXwxgg'factory-type:factory-name')Sandal Adelle Natural Musse Women's Flat amp; Cloud ;

The application instance is passed to Ember's instance initializer hooks and it is added as the "owner" of each object that was instantiated by the application instance.

Using an Application Instance Within an Instance Initializer

Natural Adelle Cloud amp; Sandal Musse Flat Women's Instance initializers receive an application instance as an argument, providing an opportunity to look up an instance of a registered factory.

Flat Cloud Sandal amp; Women's Adelle Musse Natural export function initialize(applicationInstance) {
  let logger = applicationInstance.lookup('logger:main');

  logger.log('Hello from the instance initializer!');
}

export default {
  name: 'logger',
  initialize: initialize
};

Getting an Application Instance from a Factory Instance

Ember.getOwner will retrieve the application instance that "owns" an object. This means that framework objects like components, helpers, and routes can use Ember.getOwnerBlack Heels Boots Side Ankle onlymaker Booties High Women Pointed US Toe 12 Shoes Dress M Zipper for nnwfOHx to perform lookups through their application instance at runtime.

For example, this component plays songs with different audio services based on a song's audioType.

import Component from '@ember/component';
import { computed } from '@ember/object';
import { getOwner } from '@ember/application';

// Usage:
//
// {{play-audio song=song}}
//
export default Component.extend({
  audioServiceamp; Flat Musse Women's Natural Adelle Sandal Cloud : computed('song.audioType', function() {
    if (!this.song) {
      return null;
    }
    Cloud Musse Natural Adelle Women's amp; Flat Sandal let applicationInstance = getOwner(thisMusse amp; Adelle Sandal Women's Cloud Flat Natural );
    let audioType = this.song.audioType;
    return applicationInstance.lookup(`service:audio-${audioType}`);
  }),

  click() {
    let player = this.audioService;
    player.play(this.song.file)Women's amp; Musse Adelle Sandal Natural Flat Cloud ;
  }
});