인프런 커뮤니티 질문&답변

안녕하세요.! 

원래 강의대로라면 

memberRepository 인스턴스는 모두 같은 인스턴스가 공유되어 사용되기때문에

 아래 테스트 코드가 오류가 나지 않아야하는데, 아래와 같이 인스턴스가 스프링빈에 의해서 공유되지 않고, 하나하나 각각 따로 인스턴스가 설정된 것으로 보입니다.

왜이러는걸까요,,??

 

-> 오류내용 

 

ConfigurationSingleTonTest.java코드

package hello.core.singleton;
import hello.core.AppConfig;
import hello.core.member.MemberRepository;
import hello.core.member.MemberServiceImpl;
import hello.core.order.OrderServiceImpl;
import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import static org.assertj.core.api.Assertions.*;
public class ConfigurationSingletonTest {
    @Test
    void configurationTest() {
        ApplicationContext ac = new
                AnnotationConfigApplicationContext(AppConfig.class);
        MemberServiceImpl memberService = ac.getBean("memberService",
                MemberServiceImpl.class);
        OrderServiceImpl orderService = ac.getBean("orderService",
                OrderServiceImpl.class);
        MemberRepository memberRepository = ac.getBean("memberRepository",
                MemberRepository.class);
        //모두 같은 인스턴스를 참고하고 있다.
        System.out.println("memberService -> memberRepository = " +
                memberService.getMemberRepository());
        System.out.println("orderService -> memberRepository = " +
                orderService.getMemberRepository());
        System.out.println("memberRepository = " + memberRepository);
        //모두 같은 인스턴스를 참고하고 있다.
        assertThat(memberService.getMemberRepository()).isSameAs(memberRepository);

        assertThat(orderService.getMemberRepository()).isSameAs(memberRepository);

    }
}

 

 

 

OrderServiceImple내용

package hello.core.order;

import hello.core.discount.DiscountPolicy;
import hello.core.discount.FixDiscountPolicy;
import hello.core.member.Member;
import hello.core.member.MemberRepository;
import hello.core.member.MemoryMemberRepository;

public class OrderServiceImpl implements OrderService{

    private final MemberRepository memberRepository ;
    private final DiscountPolicy discountPolicy;

    public OrderServiceImpl(MemberRepository memberRepository, DiscountPolicy discountPolicy) {
        this.memberRepository = memberRepository;
        this.discountPolicy = discountPolicy;
    }

    @Override
    //주문을 만드는 class
    public Order createOrder(Long memberId, String itemName, int itemPrice) {
        //맴버를 찾고
        Member member = memberRepository.findById(memberId);
        //맴버를 넘기고 (discount얼마나 해야하는지)
        //단일 체계 원칙을 잘 지킨것이다.
        //할인쪽은 order에서 관여하지 않고 , 걍 discount class를 이용하여 할인값을 반환만 받음
        //할인쪽에 문제가 생기면 할인쪽만 고치며 돼서 유지보수 쉽다. (주문까지 고칠 필요는 없다)
        int discountPrice = discountPolicy.discount(member,itemPrice);


        // public Order(Long memberId, String itemName, int itemPrice, int discountPrice)
        return new Order(memberId, itemName, itemPrice, discountPrice);
    }

    //테스트용도
    public MemberRepository getMemberRepository() {
        return memberRepository;
    }
}



MemberServiceImpl내용 

package hello.core.member;

//memberService의 구현체이다.
public class MemberServiceImpl implements MemberService{

    //추상화에만 의존한다
    private final MemberRepository memberRepository ;

    //생성자를 통해서, Repository객체 주입
    public MemberServiceImpl(MemberRepository memberRepository) {
        this.memberRepository = memberRepository;
    }



    @Override
    public void join(Member member) {
        memberRepository.save(member);
    }

    @Override
    public Member findMember(Long memberId) {
        return memberRepository.findById(memberId);

    }

    //테스트 용도

    public MemberRepository getMemberRepository() {
        return memberRepository;
    }
}


App.config내용 

package hello.core;
import hello.core.discount.DiscountPolicy;
import hello.core.discount.FixDiscountPolicy;
import hello.core.discount.RateDiscountPolicy;
import hello.core.member.MemberRepository;
import hello.core.member.MemberService;
import hello.core.member.MemberServiceImpl;
import hello.core.member.MemoryMemberRepository;
import hello.core.order.OrderService;
import hello.core.order.OrderServiceImpl;
import org.springframework.context.annotation.Bean;

public class AppConfig {

    //단축키 : ctrl + alt + m : 중복제거

    @Bean
    public MemberService memberService() {
        return new MemberServiceImpl(memberRepository());
    }

    @Bean
    public OrderService orderService() {
        return new OrderServiceImpl(
                memberRepository(),
                discountPolicy());

    }
    @Bean
    public MemberRepository memberRepository() {
        return new MemoryMemberRepository();
    }

    @Bean
    public DiscountPolicy discountPolicy() {
            //여기만 바꾸면 객체들 가다 갈아끼울 수 있다.
            //단축키 ctrl + R : 이전에 실행했던거 실행해준다.
        return new RateDiscountPolicy();
    }
}



이해가 가지않습니다..ㅠㅠ