Events

Events

• Introduction
• Registering Events & Listeners
  • Generating Events & Listeners
  • Manually Registering Events
• Defining Events
• Defining Listeners
• Queued Event Listeners
  • Manually Accessing The Queue
• Firing Events
• Event Subscribers
  • Writing Event Subscribers
  • Registering Event Subscribers

Introduction

Laravel's events provides a simple observer implementation, allowing you to subscribe and listen for various events that occur in your application. Event classes are typically stored in the app/Events directory, while their listeners are stored in app/Listeners. Don't worry if you don't see these directories in your application, since they will be created for you as you generate events and listeners using Artisan console commands.

Events serve as a great way to decouple various aspects of your application, since a single event can have multiple listeners that do not depend on each other. For example, you may wish to send a Slack notification to your user each time an order has shipped. Instead of coupling your order processing code to your Slack notification code, you can simply raise an OrderShipped event, which a listener can receive and transform into a Slack notification.

Registering Events & Listeners

The EventServiceProvider included with your Laravel application provides a convenient place to register all of your application's event listeners. The listen property contains an array of all events (keys) and their listeners (values). Of course, you may add as many events to this array as your application requires. For example, let's add a OrderShipped event:

/**
 * The event listener mappings for the application.
 *
 * @var array
 */
protected $listen = [
    'App\Events\OrderShipped' => [
        'App\Listeners\SendShipmentNotification',
    ],
];