class PrivateTempStoreFactory

class PrivateTempStoreFactory {
    
    /**
     * The storage factory creating the backend to store the data.
     *
     * @var \Drupal\Core\KeyValueStore\KeyValueExpirableFactoryInterface
     */
    protected $storageFactory;
    
    /**
     * The lock object used for this data.
     *
     * @var \Drupal\Core\Lock\LockBackendInterface
     */
    protected $lockBackend;
    
    /**
     * The current user.
     *
     * @var \Drupal\Core\Session\AccountProxyInterface
     */
    protected $currentUser;
    
    /**
     * The request stack.
     *
     * @var \Symfony\Component\HttpFoundation\RequestStack
     */
    protected $requestStack;
    
    /**
     * The time to live for items in seconds.
     *
     * @var int
     */
    protected $expire;
    
    /**
     * Constructs a Drupal\Core\TempStore\PrivateTempStoreFactory object.
     *
     * @param \Drupal\Core\KeyValueStore\KeyValueExpirableFactoryInterface $storage_factory
     *   The key/value store factory.
     * @param \Drupal\Core\Lock\LockBackendInterface $lock_backend
     *   The lock object used for this data.
     * @param \Drupal\Core\Session\AccountProxyInterface $current_user
     *   The current account.
     * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
     *   The request stack.
     * @param int $expire
     *   The time to live for items, in seconds.
     */
    public function __construct(KeyValueExpirableFactoryInterface $storage_factory, LockBackendInterface $lock_backend, AccountProxyInterface $current_user, RequestStack $request_stack, $expire = 604800) {
        $this->storageFactory = $storage_factory;
        $this->lockBackend = $lock_backend;
        $this->currentUser = $current_user;
        $this->requestStack = $request_stack;
        $this->expire = $expire;
    }
    
    /**
     * Creates a PrivateTempStore.
     *
     * @param string $collection
     *   The collection name to use for this key/value store. This is typically
     *   a shared namespace or module name, e.g. 'views', 'entity', etc.
     *
     * @return \Drupal\Core\TempStore\PrivateTempStore
     *   An instance of the key/value store.
     */
    public function get($collection) {
        // Store the data for this collection in the database.
        $storage = $this->storageFactory
            ->get("tempstore.private.{$collection}");
        return new PrivateTempStore($storage, $this->lockBackend, $this->currentUser, $this->requestStack, $this->expire);
    }

}