drupal-events

To subscribe to KernelEvents in Drupal, create a class implementing EventSubscriberInterface, define getSubscribedEvents to map event constants to methods, and register it in services.yml using the event_subscriber tag.

Use event subscribers instead of hooks when building responsive module logic across the HTTP lifecycle, as PSR-14 subscribers offer object-oriented event handling that integrates cleanly with Symfony events in Drupal 11.

Enforce execution order for event subscribers by configuring priority values within getSubscribedEvents, ensuring correct sequencing when multiple subscribers listen to the same KernelEvents in Drupal.

Yes, you can handle custom events using PSR-14 in Drupal 11 by defining the event object, dispatching it through the event dispatcher, and creating a subscriber class tagged in services.yml to respond to it.

The minimal setup to log a request using KernelEvents involves creating a basic module with a subscriber class listening to KernelEvents::REQUEST, then registering the service in services.yml to execute your logging logic.

Yes, you need services.yml to register a Drupal event subscriber because the file applies the required event_subscriber tag that allows the service container to recognize and activate your PSR-14 listener.