protected function doLoadAcl(ObjectIdentityInterface $objectIdentity)
    {
        $acl = null;
        try {
            $acl = $this->getAclProvider()->createAcl($objectIdentity);
        } catch (AclAlreadyExistsException $ex) {
            $acl = $this->getAclProvider()->findAcl($objectIdentity);
        }

        return $acl;
    }