[Servlet] 회원 관리 웹 애플리케이션 요구사항

1. 회원 정보

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• 이름: username
• 나이: age

 

 

2. 기능 요구사항

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• 회원 저장
• 회원 목록 조회

 

 

 

3. Member

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@Getter
@Setter
public class Member {

    private Long id;
    private String username;
    private int age;

    public Member() {
    }

    public Member(String username, int age) {
        this.username = username;
        this.age = age;
    }
}

 

 

 

 

4. MemberRepository

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/**
 * 실무에서는 동시성 문제 고려해야함.
 * ConcurrentHashMap, AtomicLong 사용 고려
 */
public class MemberRepository {

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

    private static final MemberRepository instance = new MemberRepository();

    public static MemberRepository getInstance(){
        return instance;
    }

    //생성자 틀어막기 ㅋㅋ
    private MemberRepository() {
    }

    public Member save(Member member){
        member.setId(++sequence);
        store.put(member.getId(), member);
        return member;
    }

    public Member findById(Long id){
        return store.get(id);
    }

    public List<Member> findAll(){
        return new ArrayList<>(store.values());
    }

    public void clearStore(){
        store.clear();
    }
}

 

 

 

5. Test

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class MemberRepositoryTest {

    MemberRepository memberRepository = MemberRepository.getInstance();

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

    @Test
    void save(){
        //given
        Member member = new Member("hello", 20);

        //when
        Member savedMember = memberRepository.save(member);

        //then
        Member findMember = memberRepository.findById(member.getId());
        assertThat(findMember).isEqualTo(member);

    }

    @Test
    void findAll(){
        //given
        Member member1 = new Member("member1", 20);
        Member member2 = new Member("member2", 30);

        memberRepository.save(member1);
        memberRepository.save(member2);

        //when
        List<Member> result = memberRepository.findAll();

        //then
        assertThat(result.size()).isEqualTo(2);
        assertThat(result).contains(member1, member2);

    }
}

 

 

6. GitHub : 210909 Requirement

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GitHub - bsh6463/MVC1