회원 관리 예제

Hello_Spring_Boot/src/main/java/Spring_Boot_Study/Hello_Spring_Boot/domain/Member.java

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+package Spring_Boot_Study.Hello_Spring_Boot.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;
+    }
+}

Hello_Spring_Boot/src/main/java/Spring_Boot_Study/Hello_Spring_Boot/repository/MemberRepository.java

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+package Spring_Boot_Study.Hello_Spring_Boot.repository;
+
+import Spring_Boot_Study.Hello_Spring_Boot.domain.Member;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface MemberRepository {
+    Member save(Member member);  // 회원 정보 저장
+    Optional<Member> findById(Long id);
+    Optional<Member> findByName(String name);
+    List<Member> findAll();
+}

Hello_Spring_Boot/src/main/java/Spring_Boot_Study/Hello_Spring_Boot/repository/MemoryMemberRepository.java

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+package Spring_Boot_Study.Hello_Spring_Boot.repository;
+
+import Spring_Boot_Study.Hello_Spring_Boot.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) {
+        // null이 리턴될 가능성이 있을땐 Optional사용. 이렇게하면 null 대신 optional이 감싸짐.
+        return Optional.ofNullable(store.get(id));
+    }
+
+    @Override
+    public Optional<Member> findByName(String name) {
+        return store.values().stream()
+                .filter(member -> member.getName().equals(name))
+                .findAny();
+        // 자바 람다식
+        // findAny(): 하나라도 찾는 것
+    }
+
+    @Override
+    public List<Member> findAll() {
+        return new ArrayList<>(store.values());
+    }
+
+    // repository 비워줌(테스트 할 때 사용)
+    public void clearStore(){
+        store.clear();
+    }
+}

Hello_Spring_Boot/src/main/java/Spring_Boot_Study/Hello_Spring_Boot/service/MemberService.java

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+package Spring_Boot_Study.Hello_Spring_Boot.service;
+
+import Spring_Boot_Study.Hello_Spring_Boot.domain.Member;
+import Spring_Boot_Study.Hello_Spring_Boot.repository.MemberRepository;
+import Spring_Boot_Study.Hello_Spring_Boot.repository.MemoryMemberRepository;
+
+import java.util.List;
+import java.util.Optional;
+
+public class MemberService {
+    // 기존의 new 로 새 객체를 생성하는 대신 constructor로 외부에서 넣어주도록 변경
+    // DI(Dependency Injection) - 외부에서 넣어줌
+    private final MemberRepository memberRepository;
+
+    public MemberService(MemberRepository memberRepository) {
+        this.memberRepository = memberRepository;
+    }
+
+    /**
+     * 회원가입
+     */
+    public Long join(Member member) {
+        validateDuplicateMember(member); //중복 회원 검증
+        memberRepository.save(member);
+        return member.getId();
+    }
+    private void validateDuplicateMember(Member member) {
+        // 여기서는 중복 이름 안되게 설정
+
+        // "memberRepository.findByName((member.getName()));" 까지만 쓰고
+        // ctrl + alt + v 하면 자동으로 할당 받는 변수 생성해줌.
+//        Optional<Member> result = memberRepository.findByName((member.getName()));
+//        result.ifPresent(m -> {
+//            throw new IllegalStateException("이미 존재하는 회원입니다.");
+//        });
+
+        // 위 표현 대신 아래처럼 하느게 이쁨.
+//        memberRepository.findByName(member.getName())
+//                .ifPresent(m -> {
+//                    throw new IllegalStateException("이미 존재하는 회원입니다.");
+//                });
+
+        // 위의 것을 메소드로 지정
+        validateDuiplicateMember(member);
+    }
+
+    private void validateDuiplicateMember(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);
+    }
+}

Hello_Spring_Boot/src/test/java/Spring_Boot_Study/Hello_Spring_Boot/repository/MemoryMemberRepositoryTest.java

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+package Spring_Boot_Study.Hello_Spring_Boot.repository;
+
+import Spring_Boot_Study.Hello_Spring_Boot.domain.Member;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.*;
+
+class MemoryMemberRepositoryTest {
+
+    MemoryMemberRepository repository = new MemoryMemberRepository();
+
+    // 콜백 메소드
+    @AfterEach
+    public void afterEach() {
+        // 테스트 하나 끝나면 repository 지워줌
+        repository.clearStore();
+    }
+
+    //실행 단축키: ctrl + shift + F10
+    @Test
+    public void save() {
+        //given
+        Member member = new Member();
+        member.setName("spring");
+        //when
+        repository.save(member);
+        //then
+        // optional에서 값을 꺼낼 땐 get()이용(사실 get이 좋은 방법은 아닌데 테스트이므로)
+        Member result = repository.findById(member.getId()).get();
+
+        // 검증
+
+        // 위에 new 만든 값이랑 메모리에 저장한 값이 같은지 확인
+        //성공하면 파란불. 아니면 빨간 메세지
+        //Assertions.assertEquals(member, result);
+
+        // 요즘 많이 쓰는 방법
+        assertThat(member).isEqualTo(result);
+        //Assertions.assertThat(member).isEqualTo(result);
+        // alt+enter -> static import하면 'Assertions' 숨기고 앞으로는 assertThat만 써도 됨
+    }
+
+    @Test
+    public void findByName() {
+        //given
+        Member member1 = new Member();
+        member1.setName("spring1");
+        repository.save(member1);
+
+        // 팁: 위에 member1 세팅 세줄 복붙하고 shift+f6 누르고 이름을 "member2"로 바꾸면
+        // 나머지도 member로 따라 같이 바뀜.
+        Member member2 = new Member();
+        member2.setName("spring2");
+        repository.save(member2);
+        //when
+        Member result = repository.findByName("spring1").get();
+        // get() 맨뒤에 쓰면 optional 꺼내서 줌.
+
+        //then
+        assertThat(result).isEqualTo(member1);
+    }
+
+    @Test
+    public void findAll() {
+        //given
+        Member member1 = new Member();
+        member1.setName("spring1");
+        repository.save(member1);
+        Member member2 = new Member();
+        member2.setName("spring2");
+        repository.save(member2);
+        //when
+        List<Member> result = repository.findAll();
+        //then
+        assertThat(result.size()).isEqualTo(2);
+    }
+}

Hello_Spring_Boot/src/test/java/Spring_Boot_Study/Hello_Spring_Boot/service/MemberServiceTest.java

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+package Spring_Boot_Study.Hello_Spring_Boot.service;
+
+import Spring_Boot_Study.Hello_Spring_Boot.domain.Member;
+import Spring_Boot_Study.Hello_Spring_Boot.repository.MemoryMemberRepository;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+import static org.junit.jupiter.api.Assertions.*;
+
+class MemberServiceTest {
+
+    //MemberService memberService = new MemberService();
+    //MemoryMemberRepository memberRepository = new MemoryMemberRepository();
+
+    // 위 방식은 각자 다른 객체를 생성하므로 좋지 않음.
+    // 현재는 store가 static 방식이므로 문제될 건 없지만 아래처럼 하는게 좋음.
+    MemberService memberService;
+    MemoryMemberRepository memberRepository;
+
+    // 각 테스트 실행 전에 이거 먼저 실행
+    @BeforeEach
+    public void beforeEach() {
+        // 테스트 실행할 때마다 각각 생성
+        memberRepository = new MemoryMemberRepository();
+        memberService = new MemberService(memberRepository);
+    }
+
+    // 콜백 메소드
+    @AfterEach
+    public void afterEach() {
+        // 테스트 하나 끝나면 memberRepository 지워줌
+        memberRepository.clearStore();
+    }
+
+    @Test
+    void 회원가입() {
+        //Given
+        Member member = new Member();
+        member.setName("hello");
+
+        //When
+        Long saveId = memberService.join(member);
+
+        //Then
+
+        Member findMember = memberService.findOne(saveId).get();
+        Assertions.assertThat(member.getName()).isEqualTo(findMember.getName());
+
+        //assertEquals(member.getName(), findMember.getName());
+    }
+
+    @Test
+    public void 중복_회원_예외(){
+        //Given
+        // member1과 member2 이름이 같음.
+        Member member1 = new Member();
+        member1.setName("spring");
+        Member member2 = new Member();
+        member2.setName("spring");
+
+        //When
+        memberService.join(member1);
+
+        // 예외가 제대로 발생하는지 확인
+
+//        try {
+//            memberService.join(member2);
+//            fail();
+//        } catch(IllegalStateException e){
+//            assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");
+//        }
+
+        // 위 방법 대신 아래 방법 사용
+        assertThrows(IllegalStateException.class, () -> memberService.join(member2));
+
+        // 메시지 검증할 때
+        IllegalStateException e = assertThrows(IllegalStateException.class,
+                () -> memberService.join(member2));//예외가 발생해야 한다.
+        assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");
+    }
+
+
+    @Test
+    void findMembers() {
+    }
+
+    @Test
+    void findOne() {
+    }
+}