스프링 기본편 정리1

김영한 님의 강의를 보면서 배운것들을 복습하기 위해 쓴다.

 

//멤버 등급
public enum Grade {
    VIP, BASIC
}


//멤버 객체
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;
    }
}

//오더 객체
public class Order {
    Long memberId;
    String name;
    int price;

    public Order(Long memberId, String name, int price) {
        this.memberId = memberId;
        this.name = name;
        this.price = price;
    }

    public Long getMemberId() {
        return memberId;
    }

    public String getName() {
        return name;
    }

    public int getPrice() {
        return price;
    }

    @Override
    public String toString() {
        return "Order{" +
                "memberId=" + memberId +
                ", name='" + name + '\'' +
                ", price=" + price +
                '}';
    }
}

 

//멤버 저장소

public interface MemberRepository {
    public void save(Member member);

    public Member findById(Long memberId);

}


public class MemoryMemberRepository implements MemberRepository {

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

    @Override
    public void save(Member member) {
        this.memberRepository.put(member.getId(), member);
    }

    @Override
    public Member findById(Long memberId) {
        Member member = memberRepository.get(memberId);
        return member;
    }
}

 

//멤버 서비스

public interface MemberService {

    public void join(Member member);

    public Member findMember(Long memberId);


}

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) {
        Member member = memberRepository.findById(memberId);
        return member;
    }
}

//주문

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

}


public class OrderServiceImpl implements OrderService {

    private final MemberService memberService;
    private final DiscountPolicy discountPolicy;
    public OrderServiceImpl(MemberService memberService, DiscountPolicy discountPolicy) {
        this.memberService = memberService;
        this.discountPolicy = discountPolicy;
    }

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

        Member member = memberService.findMember(memberId);
        itemPrice = discountPolicy.discount(member, itemPrice);
        Order order = new Order(memberId, itemName, itemPrice);

        return order;
    }
}

//영수증 역할

public interface Menu {
    public String getItemName();
    public int getCost();
}

public class ShinRamen implements Menu{
    private final String itemName;

    public ShinRamen() {
        itemName = "신라면";
    }
    @Override
    public String getItemName() {
        return itemName;
    }

    @Override
    public int getCost() {
        return 1500;
    }
}

public class RamenDecorator implements Menu{

    private final Menu menu;

    public RamenDecorator(Menu menu) {
        this.menu = menu;
    }

    @Override
    public String getItemName() {
        return menu.getItemName();
    }

    @Override
    public int getCost() {
        return menu.getCost();
    }
}

public class Egg extends RamenDecorator{

    private final String itemName = ", 계란";
    private final int cost = 500;

    public Egg(Menu menu) {
        super(menu);
    }

    public String getItemName() {
        return super.getItemName() + this.itemName;
    }

    public int getCost() {
        return super.getCost() + this.cost;
    }

}

public class MemberApp {

    public static void main(String[] args) {
        MemberRepository memberRepository = new MemoryMemberRepository();
        DiscountPolicy discountPolicy = new RateDiscountPolicy();
        MemberService memberService = new MemberServiceImpl(memberRepository);
        OrderService orderService = new OrderServiceImpl(memberService, discountPolicy);


        Member vipMember = new Member(1L, "memberA", Grade.VIP);
        memberService.join(vipMember);
        Member findMember = memberService.findMember(1L);
        System.out.println("new member = " + vipMember.getName());
        System.out.println("find Member = " + findMember.getName());

        Member basicMember = new Member(2L, "memberB", Grade.BASIC);
        memberService.join(basicMember);
        findMember = memberService.findMember(2L);
        System.out.println("new member = " + basicMember.getName());
        System.out.println("find Member = " + findMember.getName());

        Menu ramen = new ShinRamen();
        ramen = new Egg(ramen);
        ramen = new Egg(ramen);

        System.out.println("Items : " + ramen.getItemName());
        System.out.println("Cost : " + ramen.getCost());

        findMember = memberService.findMember(1L);
        Order vipOrder1 = orderService.createOrder(findMember.getId(), ramen.getItemName(), ramen.getCost());
        System.out.println("order = " + vipOrder1);

        findMember = memberService.findMember(2L);
        Order basicOrder2 = orderService.createOrder(findMember.getId(), ramen.getItemName(), ramen.getCost());
        System.out.println("order = " + basicOrder2);
    }

}