StorageRepository.java

 //  manually sets the storage to storageUI
    private List<UIStorage> createStorageUIList(List<Storage> storageUnits, Executor executor)
    {
        List<UIStorage> UIStorageList = new ArrayList<>();

            for (Storage storage : storageUnits)
            {
                 executor.execute(() ->
                 {
                UIStorageList.add(createUIStorage(storage));
                 });
            }
        return UIStorageList;
    }

    //  returns one storage unit
    public UIStorage getUIStorageUnit(long id)
    {
        return createUIStorage(getDao().getStorageUnit(id));
    }

    //  returns uiStorage from storage
    private UIStorage createUIStorage(Storage storage)
    {
        UIStorage uiStorage = new UIStorage(storage.id, storage.getName(), storage.getLocation(), storage.getImgPath());
        uiStorage.setAmountOfRacks(getDao().getAmountOfRacks(storage.id));
        uiStorage.setAmountOfComponents(getDao().getAmountOfComponents(storage.id));
        return uiStorage;
    }