[Service] 간단한 회원 관리 예제

Service

package hello.hellospring.service;

import hello.hellospring.domain.Member;
import hello.hellospring.repository.MemberRepository;
import hello.hellospring.repository.MemoryMemberRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Optional;

/*
* Repository 같은 경우는 조금더 데이터베이스에 가까운 이름
* Service 같은 경우는 비지니스에 가까운 이름
*/

// @Service를 통해 스프링 컨테이너에 등록
@Service
public class MemberService {
    private final MemberRepository memberRepository;

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

    /*
    * 회원 가입
    */
    @Transactional
    public Long join(Member member) {
        // 같은 이름이 있는 중복 회원 X 가정
        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.");
                });
    }

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

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


}

 

Optional? https://dogandbird.tistory.com/105

 

package hello.hellospring.service;

import hello.hellospring.domain.Member;
import hello.hellospring.repository.MemoryMemberRepository;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.*;

// 단위 테스트: 스프링 통합 테스트보다 좋은 테스트일 확률이 높음
// 불가피하게 스프링을 올려야 될 경우라면 개발이 잘못된거 일수도..

class MemberServiceTest {

    MemberService memberService;
    MemoryMemberRepository memberRepository;

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

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

    @Test
    void 회원가입() {
        // given: 상황이 주어짐
        Member member = new Member();
        member.setName("hello");

        // when: 이걸 실행했을때
        Long saveId = memberService.join(member);

        // then: 결과가 이렇게 나와야 돼
        Member findMember = memberService.findOne(saveId).get();
        assertThat(member.getName()).isEqualTo(findMember.getName());
    }

    @Test
    public void 중복_회원_예외(){
        // given
        Member member1 = new Member();
        member1.setName("spring");

        Member member2 = new Member();
        member2.setName("spring");

        // when
        memberService.join(member1);

/*
        try {
            memberService.join(member2);
            fail();
        } catch (Exception e) {
            assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");
        }
*/

        // then
        assertThrows(IllegalStateException.class, () -> memberService.join(member2));
    }

    @Test
    void findMembers() {
    }

    @Test
    void findOne() {
    }
}