Bluz\Cache\Adapter\FileBase::__construct PHP Method

    public function __construct($settings = [])
    {
        if (!isset($settings['cacheDir'])) {
            throw new ConfigurationException("FileBase adapters is required 'cacheDir' option");
        }
        $cacheDir = $settings['cacheDir'];
        if (!is_dir($cacheDir)) {
            throw new ConfigurationException("'{$cacheDir}' is not directory");
        }
        if (!is_writable($cacheDir)) {
            throw new ConfigurationException("Directory '{$cacheDir}' is not writable");
        }
        // get rid of trailing slash
        $this->cacheDir = realpath($cacheDir);
        parent::__construct($settings);
    }