events

To decouple application layers in Laravel, dispatch plain data event objects from triggering actions and attach isolated listeners to handle side effects. This approach separates what happened from how the system reacts, reducing tight coupling and maintenance risks.

The observer pattern in PHP reduces tight coupling by using events as lightweight, serializable payloads that describe what happened. Independent listeners react to these events asynchronously, enabling scalable and testable workflows without embedding business logic in the event objects.

You set up asynchronous event listeners by implementing the optional ShouldQueue method on your listener classes. This allows events dispatched from triggering actions to be queued, enabling independent listeners to process side effects like audit trails and notifications reliably.

Yes, decoupled events are ideal for microservice integrations and multi-step processes. They convey changes as plain data objects, allowing independent listeners across services to react to a single action with isolated side effects like notifications and audit trails.

The conventions for event and listener classes in Laravel-style apps require placing Event classes in the app/Events directory and Listener classes in app/Listeners. Listeners can implement optional ShouldQueue and failed() methods to ensure processing reliability.

Event listeners in decoupled architectures can fail due to asynchronous processing errors or service timeouts. You handle these failures by implementing the optional failed() method in your listener classes, which provides a reliability mechanism for queued event processing.