// Service (backend logic)
public interface ProductService {
	ProductModel findByCode(String code);
}

@Service
public class DefaultProductService implements ProductService {

	private final FlexibleSearchService flexibleSearchService;

	public DefaultProductService(final FlexibleSearchService flexibleSearchService) {
		this.flexibleSearchService = flexibleSearchService;
	}

	@Override
	public ProductModel findByCode(final String code) {
		// ...
		return null;
	}
}

// Facade (frontend API)
public interface ProductFacade {
	ProductData getProduct(String code);
}

@Service
public class DefaultProductFacade implements ProductFacade {

	private final ProductService productService;
	private final Converter<ProductModel, ProductData> converter;

	public DefaultProductFacade(final ProductService productService,
			final Converter<ProductModel, ProductData> converter) {
		this.productService = productService;
		this.converter = converter;
	}

	@Override
	public ProductData getProduct(final String code) {
		return converter.convert(productService.findByCode(code));
	}
}

Create -> InitDefaults -> Prepare -> Validate -> Save
Load   -> LoadInterceptor
Delete -> RemoveInterceptor

core -> facades -> storefront
     -> backoffice
     -> occ (REST API)

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