core/app/Handlers/Handler.php

<?php
namespace App\Handlers;

use App\Handlers\Contracts\AppHandler;
use App\Models\User;

/**
 * Class Handler
 *
 * Handler is a class which handles module-specific behaviour which cannot be done by module itself, resp. cannot be
 * done by some abstract magic.
 *
 * @package App\Handlers
 */
abstract class Handler implements AppHandler
{
    public static function getHistoryHandler()
    {
        return History::class;
    }

    /**
     * Register admin menu (or multiple ones)
     *
     * This cannot be in ServiceProvider because Session is started at middleware. And ServiceProvider is called before
     * starting any middleware..
     *
     * @param User $user model of logged user
     */
    public static function registerAdminMenu(User $user)
    {
        // core menu is registered in AdminMenuServiceProvider
    }
}