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Software Architecture in Java: Design & Development

Develop the Business Service Tier

Explore how to develop the business service tier to handle many-to-many self-referencing relationships. Learn to implement and test operations like finding all records, creating, removing, and checking link presence between member entities using Java Spring and Hibernate frameworks.

We'll cover the following...

We will review the business service tier.

“Find all records” operation

First, we will review how to perform the “find all records” operation.

Java
@RunWith( SpringJUnit4ClassRunner.class )

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

@TransactionConfiguration( defaultRollback = true )

@Transactional

public class MemberMemberServiceImplTest {



	@Autowired

	private MemberService memberService;

	

	@Autowired

	private MemberMemberService memberMemberService;

	

	@Test

	public void testFindAll() {

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

	}

}

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

Java
@Service

@Transactional

public class MemberMemberServiceImpl implements MemberMemberService {



	@Autowired

	private MemberDao memberDao;

	

	@Autowired

	private MemberMapper memberMapper;

	

	@Autowired

	private MemberMemberDao memberMemberDao;	

	

	@Override

	public List<MemberMemberDto> findAll() {

		List<MemberMemberDto> memberMemberDtos = new ArrayList<MemberMemberDto>();

		List<Member> memberList = memberMemberDao.getAll();

		for(Member member : memberList) {			

			MemberDto memberDto = memberMapper.mapEntityToDto(member);			

			Set<Member> members1 = member.getMembers1();

			for(Member member2 : members1) {

				MemberMemberDto memberMemberDto = new MemberMemberDto();

				memberMemberDto.setMemberId1(memberDto);

				MemberDto memberDto2 = memberMapper.mapEntityToDto(member2);

				memberMemberDto.setMemberId2(memberDto2);

				memberMemberDtos.add(memberMemberDto);

			}			

		}

		return memberMemberDtos;

	}

}
...