스프링 회원 관리 예제

비즈니스 요구사항 정리

• 데이터: 회원 ID, 이름
• 기능: 회원 등록, 조회

컨트롤러: 웹 MVC의 컨트롤러 역할
서비스: 핵심 비즈니스 로직 구현
리포지토리: 데이터베이스에 접근, 도메인 객체를 DB에 저장하고 관리
도메인: 비즈니스 도메인 객체

• 가벼운 메모리 기반의 데이터 저장소 사용

domain

Member.java

package com.example.hellospring.domain;

public class Member {

    private Long id;
    private String name;
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }



    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }


}

repository

MemberRepository.java -> interface

package com.example.hellospring.repository;

import com.example.hellospring.domain.Member;

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

public interface MemberRepository {
    Member save(Member member);
    Optional<Member> findById(Long id);
    Optional<Member> findByName(String name);
    List<Member> findAll();
}

MemoryMemberRepository.java

package com.example.hellospring.repository;
import com.example.hellospring.domain.Member;
import java.util.*;
public class MemoryMemberRepository implements MemberRepository{

    private static Map<Long, Member> store = new HashMap<>();
    private static long sequence = 0L;

    @Override
    public Member save(Member member) {
        member.setId(++sequence);
        store.put(member.getId(),member);
        return member;
    }
    @Override
    public Optional<Member> findById(Long id) {
        return Optional.ofNullable(store.get(id));
    }
    @Override
    public Optional<Member> findByName(String name) {
        return store.values().stream()
                .filter(member -> member.getName().equals(name))
                .findAny();
    }
    @Override
    public List<Member> findAll() {
        return new ArrayList<>(store.values());
    }
    public void clearStore() {
        store.clear(); // store 전부 삭제
    }
}

service

MemberService.java

package com.example.hellospring.service;

import com.example.hellospring.domain.Member;
import com.example.hellospring.repository.MemberRepository;
import com.example.hellospring.repository.MemoryMemberRepository;

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


// test 전체 코드 만들기
// cmd + shift + t

public class MemberService {

    private final MemberRepository memberRepository;

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


    public Long join(Member member) {
        // 같은 이름이 있는 중복 회원 X
        //cmd + opt + v  optional
        //ctrl + t -> method 뽑아내기
        validateDuplicateMember(member); // 중복 회원 검증
        memberRepository.save(member);
        return member.getId();

    }

    private void validateDuplicateMember(Member member) {
        memberRepository.findByName(member.getName())
                        .ifPresent(m -> { // result에 값이 있으면
            throw new IllegalStateException("이미 존재하는 회원입니다.");
        });
    }
    public List<Member> findMembers() {
        return memberRepository.findAll();
    }

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

test

• test는 순서와 상관없이 설계해야함 모든 테스트가 병렬적으로 동시에 실행되기 때문
• @AfterEach 이용해서 test method가 끝날때마다 repository 비워줌

MemoryMemberRepositoryTest.java

package com.example.hellospring.repository;

import com.example.hellospring.domain.Member;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;
import org.assertj.core.api.Assertions;

import java.util.List;

class MemoryMemberRepositoryTest {

    MemoryMemberRepository  repository = new MemoryMemberRepository();


    // test는 순서와 상관없이 설계해야함 모든 테스트가 병렬적으로 동시에 실행됨
    @AfterEach // test method가 끝날때마다 실행됨 순서와 상관 없어짐
    public void afterEach() {
        repository.clearStore();
    }

    @Test
    public void save() {
        Member member = new Member();
        member.setName("spring");

        repository.save(member);

        Member result = repository.findById(member.getId()).get();

        //jupyter
        //Assertions.assertEquals(member, result);
        Assertions.assertThat(result).isEqualTo(member);



        //org assert junit

    }
    @Test
    public void findByName() {
        Member member1 = new Member();
        member1.setName("spring1");
        repository.save(member1);

        Member member2 = new Member();
        member2.setName("spring2");
        repository.save(member2);

        Member result = repository.findByName("spring1").get();

        Assertions.assertThat(result).isEqualTo(member1);
    }
    @Test
    public void findAll() {
        Member member1 = new Member();
        member1.setName("spring");
        repository.save(member1);

        Member member2 = new Member();
        member2.setName("spring2");
        repository.save(member1);

        List<Member> result = repository.findAll();

        Assertions.assertThat(result.size()).isEqualTo(2);

    }


}

단축키

cmd + opt + v : 앞쪽에 변수 만들어줌
cmd + shift + t : 해당 클래스의 모든 test method 만들어줌
cmd + shift + enter : ; 자동완성