스프링 핵심 원리 이해1 - 회원,주문,할인 도메인

회원등급

package hrd.core.member;

public enum Grade {
    Basic,
   Vip

}

회원

package hrd.core.member;

public class Member {

    private Long id;
    private String name;
    private Grade grade;


    public Member(Long id, String name, Grade grade) {
        this.id = id;
        this.name = name;
        this.grade = grade;
    }

    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;
    }

    public Grade getGrade() {
        return grade;
    }

    public void setGrade(Grade grade) {
        this.grade = grade;
    }
}

인터페이스 -repository, service

package hrd.core.member;

public interface MemberRepository {

    void save(Member member);
    Member findById(Long MemberId);
}

 

package hrd.core.member;

public interface MemberService {

    void join(Member member);
    Member findMember(Long memberId);
}

구현체 - repository 구현체,serviceImp

 

package hrd.core.member;

import java.util.HashMap;
import java.util.Map;

public class MemoryMemberRepository implements MemberRepository{

    private static Map<Long,Member> store = new HashMap<>();

    @Override
    public void save(Member member) {

        store.put(member.getId(),member);

    }

    @Override
    public Member findById(Long memberId) {

        return store.get(memberId);
    }
}

package hrd.core.member;

public class MemberServiceImpl implements MemberService{

    private final MemberRepository memberRepository = new MemoryMemberRepository();
    @Override
    public void join(Member member) {
        memberRepository.save(member);
    }

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

잘 실행되는지 확인 _ memberApp

package hrd.core;

import hrd.core.member.Grade;
import hrd.core.member.Member;
import hrd.core.member.MemberService;
import hrd.core.member.MemberServiceImpl;

public class MemberApp {
    public static void main(String[] args) {

        MemberService memberService = new MemberServiceImpl();
        Member member = new Member(1L,"memberA", Grade.Vip);
        memberService.join(member);


        Member findMember = memberService.findMember(1L);
        System.out.println("new member = " + member.getName());
        System.out.println("find Member = " + findMember.getName());

    }
}

join 메서드 테스트 _ J unit 테스트

package hrd.core.member;

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

public class MemberServiceTest {

    MemberService memberService = new MemberServiceImpl();

    @Test

    void join(){
        //given 주어졌을 때
        Member member = new Member(1L,"memberA",Grade.Vip);
        //when 이렇게 하면
        memberService.join(member);
        Member findMember = memberService.findMember(1L);
        //then(검증) 이렇게 된다.
        Assertions.assertThat(member).isEqualTo(findMember);
    }

}

Order

주문이 끝나면 만들어지는 객체

package hrd.core.order;

public class Order {

    private Long memberId;
    private String itemName;
    private int itemPrice;
    private int discountPrice;

    public Order(Long memberId, String itemName, int itemPrice, int discountPrice) {
        this.memberId = memberId;
        this.itemName = itemName;
        this.itemPrice = itemPrice;
        this.discountPrice = discountPrice;
    }

    int calculatePrice(){

        return itemPrice-discountPrice;
    }

    public Long getMemberId() {
        return memberId;
    }

    public void setMemberId(Long memberId) {
        this.memberId = memberId;
    }

    public String getItemName() {
        return itemName;
    }

    public void setItemName(String itemName) {
        this.itemName = itemName;
    }

    public int getItemPrice() {
        return itemPrice;
    }

    public void setItemPrice(int itemPrice) {
        this.itemPrice = itemPrice;
    }

    public int getDiscountPrice() {
        return discountPrice;
    }

    public void setDiscountPrice(int discountPrice) {
        this.discountPrice = discountPrice;
    }

    @Override
    public String toString() { // 데이터 편하게 보려고
        return "Order{" +
                "memberId=" + memberId +
                ", itemName='" + itemName + '\'' +
                ", itemPrice=" + itemPrice +
                ", discountPrice=" + discountPrice +
                '}';
    }
}

package hrd.core.order;

public interface OrderService {

    Order createOrder(Long memberId, String itemName, int itemPrice);
}

package hrd.core.order;

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

public class OrderServiceImpl implements OrderService{

    private final MemberRepository memberRepository = new MemoryMemberRepository();
    private final DiscountPolicy discountPolicy = new FixDiscountPolicy();
    @Override
    public Order createOrder(Long memberId, String itemName, int itemPrice) {

        Member member = memberRepository.findById(memberId);//저장소에서 아이디를 찾아서 담고
        int discountPrice = discountPolicy.discount(member,itemPrice);// 그멤버와 가격을 보내서 할인되고

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

package hrd.core.order;

import hrd.core.member.Grade;
import hrd.core.member.Member;
import hrd.core.member.MemberService;
import hrd.core.member.MemberServiceImpl;

public class OrderApp {
    public static void main(String[] args) {
        MemberService memberService = new MemberServiceImpl();
        OrderService orderService = new OrderServiceImpl();

        Long memberId = 1L;
        Member member = new Member(memberId,"memberA", Grade.Vip);
        memberService.join(member);

        Order order = orderService.createOrder(memberId,"itemA",10000);

        System.out.println("order = " + order);
        System.out.println("order.calculatePrice = " + order.calculatePrice());
    }
}

할인정책 (인터페이스,구현체)

package hrd.core.discount;

import hrd.core.member.Member;

public interface DiscountPolicy {

    /**
     *
     * @param member
     * @param price
     * @return 할인대상금액
     */
    int discount(Member member,int price);
}

package hrd.core.discount;

import hrd.core.member.Grade;
import hrd.core.member.Member;

public class FixDiscountPolicy implements DiscountPolicy{

    private int discountFixAmount = 1000; // 1000원 할인
    @Override
    public int discount(Member member, int price) {
        if (member.getGrade()== Grade.Vip) // enum은 ==이 가능하다.
            return discountFixAmount;
        else
            return 0;

    }
}