protected function getAllKeyValues() {
    $keys = [];
    // add temporary permission to allow to read entitys
    $this->isLoadingKeys = true;
    $permissionManager = ObjectFactory::getInstance('permissionManager');
    $tmpPerm = $permissionManager->addTempPermission($this->entityType, '', PersistenceAction::READ);
    $persistenceFacade = ObjectFactory::getInstance('persistenceFacade');
    $objects = $persistenceFacade->loadObjects($this->entityType, BuildDepth::SINGLE);
    $permissionManager->removeTempPermission($tmpPerm);
    $this->isLoadingKeys = false;
    foreach ($objects as $object) {
      $key = ActionKey::createKey(
              $object->getValue($this->valueMap['resource']),
              $object->getValue($this->valueMap['context']),
              $object->getValue($this->valueMap['action'])
            );
      $keys[$key] = $object->getValue($this->valueMap['value']);
    }
    return $keys;
  }