스프링 핵심 원리/스프링 핵심 원리 이해
주문과 할인 도메인 개발 및 테스트
jeongdalma
2020. 12. 24. 22:25
비즈니스 요구사항과 설계
인터페이스를 만들고 구현체를 얼마든지 갈아끼울 수 있도록 설계한다. 지금은 스프링없는 순수한 자바로만 개발을 진행한다. 회원 회원을 가입하고 조회할 수 있다. 회원은 일반과 VIP 두 가지
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DiscountPolicy
package hello.core.discount;
import hello.core.member.Member;
public interface DiscountPolicy {
/**
* @return 할인 대상 금액
*/
int discount(Member member , int price);
}
FixDiscountPolicy
package hello.core.discount;
import hello.core.member.Grade;
import hello.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){ // enum타입은 == 을 쓰는게 맞다.
return discountFixAmount;
}
else{
return 0;
}
}
}
Order
package hello.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;
}
public 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() {
return "order{" +
"memberId=" + memberId +
", itemName='" + itemName + '\'' +
", itemPrice=" + itemPrice +
", discountPrice=" + discountPrice +
'}';
}
}
OrderService
package hello.core.order;
public interface OrderService {
Order createOrder(Long memberId , String itemName , int itemPrice);
}
OrderServiceImpl
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 = new MemoryMemberRepository();
private final DiscountPolicy discountPolicy = new FixDiscountPolicy();
@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);
}
}
OrderApp (순수 자바 코드로 테스트)
package hello.core;
import hello.core.member.Grade;
import hello.core.member.Member;
import hello.core.member.MemberService;
import hello.core.member.MemberServiceImpl;
import hello.core.order.Order;
import hello.core.order.OrderService;
import hello.core.order.OrderServiceImpl;
public class OrderApp {
public static void main(String[] args) {
MemberService memberService = new MemberServiceImpl();
OrderService orderService = new OrderServiceImpl();
Long memberId = 1L;
Member member = new Member(1L , "memberA" , Grade.VIP);
memberService.join(member);
Order itemA = orderService.createOrder(memberId, "itemA", 10000);
System.out.println("Order =" + itemA.toString());
System.out.println("Order =" + itemA.calculatePrice());
}
}
OrderServiceTest
package hello.core.order;
import hello.core.member.Grade;
import hello.core.member.Member;
import hello.core.member.MemberService;
import hello.core.member.MemberServiceImpl;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.Test;
public class OrderServiceTest {
MemberService memberService = new MemberServiceImpl();
OrderService orderService = new OrderServiceImpl();
@Test
void 주문_생성(){
Long memberId = 1L;
Member member = new Member(memberId , "memberA" , Grade.VIP);
memberService.join(member);
Order order = orderService.createOrder(memberId , "itemA" , 10000);
Assertions.assertThat(order.getDiscountPrice()).isEqualTo(1000);
}
}
스프링 핵심 원리 - 기본편 - 인프런
스프링 입문자가 예제를 만들어가면서 스프링의 핵심 원리를 이해하고, 스프링 기본기를 확실히 다질 수 있습니다. 초급 프레임워크 및 라이브러리 웹 개발 서버 개발 Back-End Spring 객체지향 온
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