WhateverController.php

<?php

use App\Cache\Cache;

class WhateverController {

    /** @var \App\Cache\Cache $cache */
    private $cache;

    public function __construct(Cache $cache) {
        $this->cache = $cache;
    }

    public function index() {
        if($this->isInMaintenanceMode()) {
            return Response::view('mainteance', [], 503);
        }
    }
    
    private function isInMaintenanceMode() {
        return $this->cache->getSetting()->mainteance_mode === 1;   
    }
    
}