Implements Drupal\Core\Queue\QueueInterface::createItem().
Overrides QueueInterface::createItem
public function createItem($data) {
$item = new stdClass();
$item->item_id = $this->idSequence++;
$item->data = $data;
$item->created = time();
$item->expire = 0;
$this->queue[$item->item_id] = $item;
return $item->item_id;
}