인프런 커뮤니티 질문&답변

Spring Boot 3.0.1버전을 사용하고 있습니다.

분명히 다른건 없어 보이는데, 제가 실수한게 있는지 여쭤보고 싶습니다.

// AppConfig
package com.example.demo;

import com.example.demo.discount.DiscountPolicy;
import com.example.demo.discount.FixDiscountPolicy;
import com.example.demo.discount.RateDiscountPolicy;
import com.example.demo.member.MemberRepository;
import com.example.demo.member.MemberService;
import com.example.demo.member.MemberServiceImpl;
import com.example.demo.member.MemoryMemberRepository;
import com.example.demo.order.OrderService;
import com.example.demo.order.OrderServiceImpl;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

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

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

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

    @Bean
    public DiscountPolicy discountPolicy() {
        return new RateDiscountPolicy();
    }

}

// OrderServiceImpl
package com.example.demo.order;

import com.example.demo.discount.DiscountPolicy;
import com.example.demo.member.Member;
import com.example.demo.member.MemberRepository;

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
    public Order createOrder(Long memberId, String itemName, int itemPrice) {
        Member member = memberRepository.findById(memberId);
        int discountPrice = discountPolicy.discount(member, itemPrice);

        return new Order(memberId, itemName, itemPrice, discountPrice);
    }

    public MemberRepository getMemberRepository() {
        return memberRepository;
    }
}

// MemberServiceImpl
package com.example.demo.member;

public class MemberServiceImpl implements MemberService{

    private final MemberRepository memberRepository;

    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);
    }

    public MemberRepository getMemberRepository() {
        return memberRepository;
    }
}

// ConfigurationSingletonTest
package singleton;

import com.example.demo.AppConfig;
import com.example.demo.member.MemberRepository;
import com.example.demo.member.MemberServiceImpl;
import com.example.demo.order.OrderServiceImpl;
import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

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);
        MemberRepository memberRepository1 = memberService.getMemberRepository();
        MemberRepository memberRepository2 = orderService.getMemberRepository();

        System.out.println("memberRepository1 = " + memberRepository1);
        System.out.println("memberRepository2 = " + memberRepository2);
        System.out.println("memberRepository3 = " + memberRepository);

    }
}

// 결과
memberRepository1 = com.example.demo.member.MemoryMemberRepository@346939bf
memberRepository2 = com.example.demo.member.MemoryMemberRepository@4bf3798b
memberRepository3 = com.example.demo.member.MemoryMemberRepository@58670130