スプリング基本3ビジネスニーズと設計による開発例の作成
ビジネスニーズと設計/開発の第1段階
(1)会員
1.会員登録と照会ができます.
2.会員には普通とvipの2つの等級があります.
3.会員データは独自のDBを作成でき、外部システムと連動可能(未確定)
package springbasic.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;
}
}
package springbasic.core.member;
public enum Grade {
BASIC,
VIP
}
package springbasic.core.member;
public interface MemberRepository {
void save(Member member);
Member findById(Long memberId);
}
package springbasic.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 springbasic.core.member;
import org.springframework.stereotype.Service;
public interface MemberService {
void join(Member member);
Member findMember(Long memberId);
}
package springbasic.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);
}
}
package springbasic.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
Member member = new Member(1L,"memberA",Grade.VIP);
//when
memberService.join(member);
Member findMember = memberService.findMember(1L);
//then
Assertions.assertThat(member).isEqualTo(findMember);
}
}
(2)注文と割引政策
1.会員は商品を注文することができます.
2.会員等級によって優遇政策を実施することができる.
3.優遇政策はすべてのvipに1000元の固定金額割引を要求する(後で変更する可能性がある)
4.優遇政策は変更される可能性が高い.会社の基本的な割引政策はまだ確定していないので、開業前に延期したいという悩み.最悪の場合割引は適用されない場合があります(未定)
package springbasic.core.discount;
import springbasic.core.member.Member;
public interface DiscountPolicy {
/**
* @return
* */
int discount(Member member, int price);
}
package springbasic.core.discount;
import springbasic.core.member.Grade;
import springbasic.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) {
return disCountFixAmount;
} else {
return 0;
}
}
}
package springbasic.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 +
'}';
}
}
package springbasic.core.order;
public interface OrderService {
Order createOrder(Long memberId, String itemName, int itemPrice);
}
package springbasic.core.order;
import springbasic.core.discount.DiscountPolicy;
import springbasic.core.discount.FixDiscountPolicy;
import springbasic.core.member.Member;
import springbasic.core.member.MemberRepository;
import springbasic.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);
}
}
package springbasic.core.order;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.Test;
import springbasic.core.member.Grade;
import springbasic.core.member.Member;
import springbasic.core.member.MemberService;
import springbasic.core.member.MemberServiceImpl;
public class OrderServiceTest {
MemberService memberService = new MemberServiceImpl();
OrderService orderService = new OrderServiceImpl();
@Test
void createOrder(){
//given
Long memberId = 1L;
Member member = new Member(memberId,"memverA", Grade.VIP);
memberService.join(member);
//when
Order order = orderService.createOrder(memberId,"itemA",10000);
//then
Assertions.assertThat(order.getDisCountPrice()).isEqualTo(1000);
}
}
->設計に基づいて開発を完了!
-->Butは本当に良いオブジェクト向けデザインの5つの原則を守っていますか?
----->ソースコードが変更された場合、オープン-クローズOCPの原則を遵守しますか?
Reference
この問題について(スプリング基本3ビジネスニーズと設計による開発例の作成), 我々は、より多くの情報をここで見つけました https://velog.io/@hadoyaji/스프링-강의-속성-정리3テキストは自由に共有またはコピーできます。ただし、このドキュメントのURLは参考URLとして残しておいてください。
Collection and Share based on the CC Protocol