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Software Architecture in Java: Design & Development

Develop the Business Service Tier

Explore how to develop the business service tier handling one-to-many bi-directional relationships in Java using Spring. Understand how to implement and test methods for fetching, creating, editing, and removing records, ensuring smooth data management and integration with the data access layer.

We'll cover the following...

We will now go to the business service tier.

Find all records operation

First, we will look at the test for the “fetch all records” operation.

Java
@RunWith( SpringJUnit4ClassRunner.class )

@ContextConfiguration( locations = { "classpath:context.xml" } )

@TransactionConfiguration( defaultRollback = true )

@Transactional

public class ItemServiceImplTest {

	@Autowired

	private ItemService service;

	@Test

	public void testFindAll(){

		Assert.assertEquals(0L, service.findAll().size());

	}

}

Let’s see how to program the corresponding method in the business service.

Java
@Service

@Transactional

public class ItemServiceImpl implements ItemService{

	@Autowired

	private ItemDao dao;

	@Autowired

	private ItemMapper mapper;

	@Override

	public List<ItemDto> findAll() {

		List<Item> items = dao.getAll();

		List<ItemDto> itemDtos = new ArrayList<ItemDto>();

		if(null !=items){

			for (Item item : items) {

				itemDtos.add(mapper.mapEntityToDto(item));

			}

		}

		return itemDtos;

	}

}

Mappers

As shown earlier, we have a mapper for translating data access objects into entities and vice-versa. It usually has two operations displayed underneath. One thing to note ...