public function findByIds(array $ids)
    {
        $entities = [];

        for ($i = 0; $i < count($this->registries); $i++) {
            /** @var RegistryInterface $registry */
            $registry = $this->registries[ $i ];
            $found = $registry->findByKeys($ids);
            $entities = array_merge($entities, $found);

            $this->updateRegistries($found, $i - 1);

            if (count($entities) === count($ids)) {
                break;
            }
        }

        return $entities;
    }