간단한 회원관리 서블릿 만들기

package hello.servlet.domain.member;


import lombok.Getter;
import lombok.Setter;

@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;
    }
}

여기까지는 간단히 롬복으로 만든 VO

 

package hello.servlet.domain.member;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/*
* 동시성 문제가 고려되어 있지 않음, 실무에서는 ConcurrentHashMap, AtomicLong 사용 고려
* */

public class MemberRepository {

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

    private static final MemberRepository instance = new MemberRepository();

    public static MemberRepository getInstance(){
        return instance;
    }

    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();
    }
}

DB 대용으로 사용할 레파지토리

package hello.servlet.domain.member;

import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;

import java.util.List;

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

class MemberRepositoryTest {

    MemberRepository memberRepository = MemberRepository.getInstance();


    //1개의 테스트가 끝나면 자동으로 지움
    @AfterEach
    void afterEach() {
        memberRepository.clearStore();
    }

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

        //when
        Member saveMember = memberRepository.save(member);
        //then
        Member findMember = memberRepository.findById(saveMember.getId());
        assertThat(findMember).isEqualTo(saveMember);
        //assertj꺼 사용
        //findMember와 saveMember가 같아야한다다
    }

    @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);
    }
}

간단히 테스트 코드 작성..

 

Assertion 은 단축키 alt enter로 간단히 static으로 바꿀수있다

 

변수 만들기는 ctrl alt v (유용하네)