Working with Events and Listeners

Events let different parts of a Laravel application react to something happening without tightly coupling the code that triggers it to the code that responds to it.

Why Decouple With Events

Without events, a controller might directly call code to send an email, log an entry, and update a cache all in one place. With events, the controller simply announces "this happened" and any number of listeners can react independently.

The Pieces Involved

Registering the Mapping

protected $listen = [
    OrderShipped::class => [
        SendShipmentNotification::class,
    ],
];

Laravel can also auto-discover listeners without manual registration if event discovery is enabled.

Understanding this relationship sets up the next, more hands-on step: actually writing and firing a custom event.