[Domain/Repository] 간단한 회원 관리 예제

• 도메인: 비즈니스 도메인 객체
• 리포지토리: 데이터베이스 접근, 도메인 객체를 DB에 저장하고 관리
• 서비스: 비지니스 로직 구현

 

Domain

package hello.hellospring.domain;

import jakarta.persistence.*;

@Entity
public class Member {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    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

인터페이스 만든 후, 이를 구현하는 형식으로 작성 (여러가지 DB 접근 방법 사용하기 위해서)

package hello.hellospring.repository;

import hello.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();

}

 

package hello.hellospring.repository;

import hello.hellospring.domain.Member;
import org.springframework.stereotype.Repository;

import java.util.*;

@Repository
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();
    }
}

 

package hello.hellospring.repository;

import hello.hellospring.domain.Member;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;

import java.util.List;

import static org.assertj.core.api.AssertionsForClassTypes.assertThat;

class MemoryMemberRepositoryTest {
    MemoryMemberRepository repository = new MemoryMemberRepository();

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

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

        repository.save(member);
        repository.findById(member.getId());

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

    @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();

        assertThat(result).isEqualTo(member1);
    }

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

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

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

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

 

테스트 코드는 순서에 의존적으로 작성하면 안됨!

테스트 코드 시 작성하는 Assertions? https://dogandbird.tistory.com/81

 

 

출처: 스프링 입문(김영한)