AccessCheck.php

<?php

namespace Drupal\menu_test\Access;

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Routing\Access\AccessInterface;

/**
 * Checks access based on the 'menu_test' key in session.
 */
class AccessCheck implements AccessInterface {
    
    /**
     * Check to see if user accessed this page.
     *
     * @return \Drupal\Core\Access\AccessResultInterface
     *   The access result.
     */
    public function access() {
        if (!isset($_SESSION['menu_test'])) {
            $result = AccessResult::allowed();
        }
        else {
            $result = AccessResult::allowedIf($_SESSION['menu_test'] < 2);
        }
        return $result->setCacheMaxAge(0);
    }
    
    /**
     * @return \Drupal\Core\Access\AccessResultForbidden
     */
    public function menuLocalAction7() {
        return AccessResult::forbidden()->addCacheTags([
            'menu_local_action7',
        ])
            ->addCacheContexts([
            'url.query_args:menu_local_action7',
        ]);
    }
    
    /**
     * @return \Drupal\Core\Access\AccessResultAllowed
     */
    public function menuLocalAction8() {
        return AccessResult::allowed()->addCacheTags([
            'menu_local_action8',
        ])
            ->addCacheContexts([
            'url.query_args:menu_local_action8',
        ]);
    }

}