models/classes/ExtendedStateService.php
public function getStorageService()
    {
        if (!$this->storageService) {
            $this->storageService = $this->getServiceLocator()->get(StorageManager::SERVICE_ID);
        }
        return $this->storageService;
    }
public function getStorageService()
    {
        if (!$this->storageService) {
            $this->storageService = $this->getServiceLocator()->get(StorageManager::SERVICE_ID);
        }
        return $this->storageService;
    }
Gets the StateStorage service
@return StorageManager