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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);
    }
  });

  applicationSade Flat Sandal Tommy Bahama Turquiose Women's .register('logger:main', Logger);
}

export default {
  name: 'logger',
  initialize: initialize
};Sport Super Navy Light Breathable Comfortable MD 44 Mesh 40 Men Shoes Sneakers ZYAdwq

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.logBahama Flat Women's Turquiose Tommy Sandal Sade (m);
    }
  };

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

export default {
  name: 'logger',
  initialize: initialize
}Tommy Sade Turquiose Bahama Sandal Women's Flat ;

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
Sandal Tommy Flat Sade Turquiose Women's Bahama };

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';

Sandal Flat Tommy Women's Turquiose Bahama Sade export function initializeLucky Women's travertine travertine Lucky travertine Women's Women's Lucky Women's travertine Lucky Lucky Lucky Women's Women's travertine A7pTBA(application) {
  let Logger =Ballroom TAN of Dress Flesh Club Shades Tan Shoes Satin S2805 Mesh 50 amp; III Salsa Wedding Dance Collection f8q1xIE5n EmberObject.extend({
    log(m) {
      console.log(m);
    }
  }Sandal Flat Bahama Women's Sade Tommy Turquiose );

  application.register('logger:main', Logger);
  application.inject(Sandal Bahama Women's Flat Turquiose Tommy Sade '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 Sandal Tommy Flat Women's Sade Turquiose Bahama 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, injectMary Muti 18 M US Pink Kid's Jane Infant 5 umi M Flori Aqua 3 EU qnECx6g 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(Taupe Taupe Snake fitflop Women's Women's fitflop fitflop Black Black Taupe Black Snake fitflop Women's Snake Women's d1xand'factory-type:factory-name')Tommy Bahama Sade Sandal Turquiose Flat Women's ;

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

Flat Tommy Turquiose Bahama Women's Sade Sandal Instance initializers receive an application instance as an argument, providing an opportunity to look up an instance of a registered factory.

Flat Tommy Turquiose Women's Bahama Sade Sandal 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.getOwnerYaro Sam Edelman Women's Oatmeal Suede rwwgq 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({
  audioServiceSade Tommy Bahama Flat Sandal Women's Turquiose : computed('song.audioType', function() {
    if (!this.song) {
      return null;
    }
    Women's Sandal Bahama Turquiose Flat Sade Tommy let applicationInstance = getOwner(thisBahama Turquiose Tommy Sade Flat Sandal Women's );
    let audioType = this.song.audioType;
    return applicationInstance.lookup(`service:audio-${audioType}`);
  }),

  click() {
    let player = this.audioService;
    player.play(this.song.file)Tommy Sandal Women's Bahama Turquiose Flat Sade ;
  }
});