스프링 입문 - 5 회원 서비스 개발

service/MemberService

public class MemberService {

    private final MemberRepository memberRepository;

    public MemberService(MemberRepository memberRepository) {
        this.memberRepository = memberRepository;
    }

    /*
    회원가입
     */
    public Long join(Member member) {
        //같은 이름이 있는 중복 회원X
        validateDuplicateMember(member); //중복 회원 검증
        memberRepository.save(member);
        return member.getId();
    }

    private void validateDuplicateMember(Member member) {
      memberRepository.findByName(member.getName())
                .ifPresent(m -> {
                    throw new IllegalStateException("이미 존재하는 회원입니다.");
                });
    }

    /*
    회원 전체 조회
     */
    public List<Member> findMembers() {
        return memberRepository.findAll();
    }

    public Optional<Member> findOne(Long memberId) {
        return memberRepository.findById(memberId);
    }

}

함수 추출 단축키 ctrl+alt+tap+T

src/java/service/MemberServiceTest

class MemberServiceTest {
    MemberService memberService;
    MemoryMemberRepository memberRepository;
?
    @BeforeEach
    public void beforeEach() {
        memberRepository = new MemoryMemberRepository();
        memberService = new MemberService(memberRepository);
    }

    @AfterEach
    public void afterEach() {
        memberRepository.clearStore();
    }

    @Test
    public void 회원가입() throws Exception {
        //Given
        Member member = new Member();
        member.setName("hello");
        //When
        Long saveId = memberService.join(member);
        //Then
        Member findMember = memberRepository.findById(saveId).get();
        assertEquals(member.getName(), findMember.getName());
    }

    @Test
    public void 중복_회원_예외() throws Exception {
        //Given
        Member member1 = new Member();
        member1.setName("spring");
        Member member2 = new Member();
        member2.setName("spring"); //When
        memberService.join(member1);
        IllegalStateException e = assertThrows(IllegalStateException.class, () -> memberService.join(member2));//예외가 발생해야 한다.
        assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");
    }
}

new memberRepository를 선언하면 memberService 안의 리포지토리와 다르기 때문에 memberService에 생성자 함수를 만들어주고 주입해준다

Service/MemberService

 private final MemberRepository memberRepository;

    public MemberService(MemberRepository memberRepository) {
        this.memberRepository = memberRepository;
    }

로 바꿔준다