[Java] OOP 회원과 주문 관리 설계 - (2) 주문 관리 기능

[Java] OOP 회원과 주문 관리 설계 - (2) 주문 관리 기능

 

 

 

1. Order

package member.order;

public class Order {
	
	private Long memberId;
	private String itemName;
	private int itemPrice;
	private int discountPrice;
	
	
	// 생성자
	public Order(Long memberId, String itemName, int itemPrice, int discountPrice) {
		super();
		this.memberId = memberId;
		this.itemName = itemName;
		this.itemPrice = itemPrice;
		this.discountPrice = discountPrice;
	}
	
	
	// 상품 금액의 할인된 가격 금액을 출력하는 기능
	public int calculateDiscount() {
		return itemPrice - discountPrice;
	}

	
}

 

 

2. DiscountPolicy

package member.order;

import member.Member;

public interface DiscountPolicy {
	
	int discount(Member member, int price);

}

 

 

3. FixDiscountPolicy

package member.order;

import member.Grade;
import member.Member;

public class FixDiscountPolicy implements DiscountPolicy {

	private int discountFixAmount = 1500;
	
	@Override
	public int discount(Member member, int price) {
		// VIP 회원만 할인 금액 적용된다.
		if(member.getGrade() == Grade.VIP) {
			return discountFixAmount;
		}
		return 0;
	}

}

 

 

4. PercentDiscountPolicy

package member.order;

import member.Grade;
import member.Member;

public class PercentDiscountPolicyImpl implements DiscountPolicy{

	private double discountDouble = 10.0;
	
	@Override
	public int discount(Member member, int price) {
		if(member.getGrade() == Grade.VIP) {
			return (int)(price * (discountDouble/100));
		}
		return 0;
	}

}

 

 

5. OrderService

package member.service;

import member.order.Order;

public interface OrderService {
	Order createOrder(Long memberId, String itemName, int itemPrice);

}

 

 

6. OrderServiceImpl

package member.service;

import member.Member;
import member.order.DiscountPolicy;
import member.order.Order;
import member.repository.MemberRepsitory;

public class OrderServiceImpl implements OrderService{

	private final MemberRepsitory memberRepsitory;
	private final DiscountPolicy discountPolicy;
	
	public OrderServiceImpl(MemberRepsitory memberRepsitory, DiscountPolicy discountPolicy) {
		this.memberRepsitory = memberRepsitory;
		this.discountPolicy = discountPolicy;
	}
	
	@Override
	public Order createOrder(Long memberId, String itemName, int itemPrice) {
		
		Member member = memberRepsitory.findById(memberId);
		int discountPrice = discountPolicy.discount(member, itemPrice);
		
		return new Order(memberId, itemName, itemPrice, discountPrice);
	}

}

 

 

7. OrderServiceTest

package order;

import member.Grade;
import member.Member;
import member.repository.MemberRepsitory;
import member.repository.MemoryMemberRepositoryImpl;

public class OrderServiceTest {
	
	
	public static void main(String[] args) {
		
		MemberRepsitory memberRepsitory = MemoryMemberRepositoryImpl.getInstance();
		
		Member member = new Member(1L, "길동이", Grade.VIP);
		
		// 고정 할인 정책 테스트
		DiscountPolicy fixDiscountPolicy = new FixDiscountPolicy();
		DiscountPolicy percentDiscountPolicy = new PercentDiscountPolicyImpl();
		
		OrderService orderService1 = new OrderServiceImpl(memberRepsitory,percentDiscountPolicy);
		Order order1 = orderService1.createOrder(1L, "맥북", 10000);
		System.out.println(order1);
		System.out.println(order1.calculateDiscount());
		
	}

}

 

-객체지향적인 관점을 통해 코드를 설계하면, 보다 적은 코드 수정으로 효율적인 관리가 가능하다!!

 

8. MainApp

package config;

import member.Grade;
import member.Member;
import member.service.MemberService;
import order.Order;
import order.OrderService;

public class MainApp {
	
	public static void main(String[] args) {
		
		AppConfig appConfig = new AppConfig();
		
		// 클라이언트 입장에서 코딩
		
		// 회원 가입 기능이 필요함
		MemberService memberService = appConfig.getMemberService();
		Member member = new Member (200L, "도시락", Grade.VIP);
		memberService.signUp(member); // 회원 가입
		
		// 사용자 주문 요청
		OrderService orderService1 = appConfig.getorderService();
		Order order1 = orderService1.createOrder(member.getId(), "아이폰16", 3_000);
		System.out.println(order1);
		System.out.println(order1.calculateDiscount());
	}

}

---

*AppConfig

package config;

import member.repository.MemberRepsitory;
import member.repository.MemoryMemberRepositoryImpl;
import member.service.MemberService;
import member.service.MemberServiceImpl;
import order.DiscountPolicy;
import order.FixDiscountPolicy;
import order.OrderService;
import order.OrderServiceImpl;

public class AppConfig {
	
	public MemberRepsitory getMemberRepository() {
		return MemoryMemberRepositoryImpl.getInstance();
	}
	
	public MemberService getMemberService() {
		return new MemberServiceImpl(getMemberRepository());
	}
	
	public DiscountPolicy getDiscountPolicy() {
		return new FixDiscountPolicy();
	}
	
	public OrderService getorderService() {
		return new OrderServiceImpl(getMemberRepository(), getDiscountPolicy());
	}

}