vendor/illuminate/database/Eloquent/Concerns/HasEvents.php

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<?php

namespace Illuminate\Database\Eloquent\Concerns;

use Illuminate\Support\Arr;
use InvalidArgumentException;
use Illuminate\Contracts\Events\Dispatcher;

trait HasEvents
{
    /**
     * The event map for the model.
     *
     * Allows for object-based events for native Eloquent events.
     *
     * @var array
     */
    protected $dispatchesEvents = [];

    /**
     * User exposed observable events.
     *
     * These are extra user-defined events observers may subscribe to.
     *
     * @var array
     */
    protected $observables = [];

    /**
     * Register observers with the model.
     *
     * @param  object|array|string  $classes
     * @return void
     *
     * @throws \RuntimeException
     */
    public static function observe($classes)
    {
        $instance = new static;

        foreach (Arr::wrap($classes) as $class) {
            $instance->registerObserver($class);
        }
    }

    /**
     * Register a single observer with the model.
     *
     * @param  object|string $class
     * @return void
     *
     * @throws \RuntimeException
     */
    protected function registerObserver($class)
    {
        $className = $this->resolveObserverClassName($class);

        // When registering a model observer, we will spin through the possible events
        // and determine if this observer has that method. If it does, we will hook
        // it into the model's event system, making it convenient to watch these.