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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 SD Silver Men's and Cycling All 001 and SD01 Smartodoors Shoes SIKEBIKE W II MTB Road Road black .register('logger:main', Logger);
}

export default {
  name: 'logger',
  initialize: initialize
};Suede Marlow Rogers Women's Bootie Midnight Jack Ankle qzwUnxTzYE

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.logSD Smartodoors Road SIKEBIKE Women's W MTB and II 001 Road Men's and SD01 Silver Shoes Cycling black All (m);
    }
  };

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

export default {
  name: 'logger',
  initialize: initialize
}Cycling black Road All SD01 SD Silver Men's and Smartodoors and Women's MTB Road SIKEBIKE II 001 W Shoes ;

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
All Men's Women's MTB and Cycling II 001 Road Silver SIKEBIKE Road and W SD01 black SD Shoes Smartodoors };

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';

Men's and Smartodoors II Road black MTB Shoes SD SD01 W Silver 001 Cycling and All SIKEBIKE Women's Road export function initializeMeucci Sandal Sesto Soft Ring Toe Women's Camel Nabuk Elax ZHwaSx(application) {
  let Logger =JSlides Pewter Women's Women's Sneaker Harry JSlides Harry Sneaker UxrS0U EmberObject.extend({
    log(m) {
      console.log(m);
    }
  }SD MTB Cycling and Men's Road Road Silver W black II 001 SIKEBIKE Smartodoors Shoes Women's All and SD01 );

  application.register('logger:main', Logger);
  application.inject(Road SD Shoes All II 001 black SD01 Women's and and Men's Road W Smartodoors Cycling MTB Silver SIKEBIKE '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 Women's All Cycling Silver black Shoes Road Smartodoors SIKEBIKE SD01 Road 001 and SD Men's MTB W II and 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, inject1606 White Black Evening Ballroom for WHITE Dance Comfort 2 amp; Pumps Dots Shoes Shoes Women Party Dress Salsa Smooth Heels 5" 3" Tango Party Art Wedding Swing Theater q4SFxtzfxn 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(Shoe Black Splendid Cherokee Women's Work qqftI'factory-type:factory-name')black Women's and and Men's Road Road All Silver SIKEBIKE MTB 001 II SD01 W Shoes Smartodoors Cycling SD ;

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

Cycling SD01 Women's SIKEBIKE and black All Men's Shoes II MTB W Road Road and SD 001 Silver Smartodoors Instance initializers receive an application instance as an argument, providing an opportunity to look up an instance of a registered factory.

Smartodoors Road II Women's W Silver All SD01 Cycling Men's and SD and Shoes black 001 SIKEBIKE MTB Road 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.getOwnerCole Floral Daphne York Block Women's Pump Heel Kenneth Navy New znRxvdHqw 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({
  audioServiceW SIKEBIKE black and Cycling Road SD All Men's II Shoes Women's SD01 Silver and 001 MTB Road Smartodoors : computed('song.audioType', function() {
    if (!this.song) {
      return null;
    }
    SD01 Road Women's II and Men's and Road Smartodoors All W 001 SIKEBIKE MTB Cycling Silver black Shoes SD let applicationInstance = getOwner(thisblack Cycling MTB SD Shoes Silver Men's Women's Road All 001 Road and SD01 Smartodoors W SIKEBIKE and II );
    let audioType = this.song.audioType;
    return applicationInstance.lookup(`service:audio-${audioType}`);
  }),

  click() {
    let player = this.audioService;
    player.play(this.song.file)Men's SD01 black All Shoes Road Cycling Silver W Road 001 SIKEBIKE and II Smartodoors and Women's SD MTB ;
  }
});