회원 관리 예제 - 회원 서비스

회원 서비스 개발

package hello.hellospring.service;

import hello.hellospring.domain.Member;
import hello.hellospring.repository.MemberRepository;
import hello.hellospring.repository.MemoryMemberRepository;

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

public class MemberService {

    private final MemberRepository memberRepository = new MemoryMemberRepository();

    public Long join(Member member) {
        Optional<Member> result = memberRepository.findByName(member.getName());        
        //Ctrl + alt + Enter => 자동완성

        result.ifPresent(m -> {     
        //Optional로 감쌌기 때문에 가능. Optional이 아니면 if null을 사용
            throw new IllegalStateException("이미 존재하는 회원입니다.");
        });
        memberRepository.save(member);
        return member.getId();
    }

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

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

package hello.hellospring.service;

import hello.hellospring.domain.Member;
import hello.hellospring.repository.MemberRepository;
import hello.hellospring.repository.MemoryMemberRepository;

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

public class MemberService {

    private final MemberRepository memberRepository = new MemoryMemberRepository();

    public Long join(Member member) {
        
        //중복 회원 검증
        validateDuplicateMember(member);        //Ctrl + alt + shift + T 메소드 만들기
        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);
    }
}

회원 서비스 테스트 케이스

클래스에서 Ctrl + shift + T 하면 바로 테스트 케이스 틀이 만들어진다.

package hello.hellospring.service;

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

import hello.hellospring.domain.Member;

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

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

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

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

        //then
        Member findMember = memberService.findOne(saveId).get();

        assertThat(member.getName()).isEqualTo(findMember.getName());
    }

    @Test
    public void 중복_회원_예외() {
        //given
        Member member1 = new Member();
        //ctrl + space , ctrl + shift + enter
        member1.setName("spring");

        Member member2 = new Member();
        //shift + F6
        member2.setName("spring");

        //when
        memberService.join(member1);
        IllegalStateException e = assertThrows(IllegalStateException.class, 
        								() -> memberService.join(member2));
        //ctrl alt V
        assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");

        //then
    }
    @Test
    void findMembers() {
    }

    @Test
    void findOne() {
    }
}

중복_회원_예외 //when 방법 2

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