Software Architecture in Java: Design & Development/

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Develop the Business Service Tier

Develop the Business Service Tier

Let's see how the business service can be developed for a one-to-many unidirectional relationship scenario.

We'll cover the following...

We will now jump to the business service tier.

Find all records operation

First, examine the test for the “fetch all records” operation.

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@RunWith( SpringJUnit4ClassRunner.class )
@ContextConfiguration( locations = { "classpath:context.xml" } )
@TransactionConfiguration( defaultRollback = true )
@Transactional
public class PersonServiceImplTest {
	@Autowired
	private PersonService service;
	@Test
	public void testFindAll(){
		Assert.assertEquals(0L, service.findAll().size());
	}
}

Then, look at how to program the equivalent method in the business service.

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@Service
@Transactional
public class PersonServiceImpl implements PersonService{
	@Autowired
	private PersonDao dao;
	@Autowired
	private PersonMapper mapper;
	@Override
	public List<PersonDto> findAll() {
		List<Person> persons = dao.getAll();
		List<PersonDto> personDtos = new ArrayList<PersonDto>();
		if(null !=persons){
			for(Person person : persons){personDtos.add(mapper.mapEntityToDto(person));}
		}
		return personDtos;
	}
}

Mappers

As shown previously, we have a mapper for converting data access objects into entities and vice-versa. This has two operations displayed in the following code. Note that the Phone identifier is generated every ...