상품 도메인 개발

도메인 분석 설계

구현 기능

• 상품 등록
• 상품 목록 조회
• 상품 수정

상품 엔티티 

@Entity
@Getter @Setter
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
// 싱글 테이블 전략
@DiscriminatorColumn(name = "dtype")
public abstract class Item {

    @Id
    @GeneratedValue
    @Column(name = "item_id")
    private Long id;

    private String name;
    private int price;
    private int stockQuantity;

    @ManyToMany(mappedBy = "items")
    private List<Category> categories = new ArrayList<>();

    // == 비즈니스 로직 ==
    // 재고수량 증가
    public void addStock(int quantity){
        this.stockQuantity += quantity;
    }

    // 재고수량 감소
    public void removeStock(int quantity){
        int restStock = this.stockQuantity - quantity;
        if(restStock < 0){
            throw new NotEnoughStockException("need more stock");
        }
        this.stockQuantity = restStock;
    }
}

 

상품 리포지토리 

@Repository
@RequiredArgsConstructor
public class ItemRepository {

    private final EntityManager em;

    public void save(Item item){
        if(item.getId() == null){
            em.persist(item);
        }
        else{
            em.merge(item);
        }
    }

    public Item findOne(Long id){
        return em.find(Item.class , id);
    }

    public List<Item> findAll(){
        return em.createQuery("select i from Item i" , Item.class)
                .getResultList();
    }
}

 

상품 서비스

@Service
@Transactional(readOnly = true)
@RequiredArgsConstructor
public class ItemService {

    private final ItemRepository itemRepository;

    @Transactional
    public void saveItem(Item item){
        itemRepository.save(item);
    }

    public List<Item> findItems(){
        return itemRepository.findAll();
    }

    public Item findOne(Long id){
        return itemRepository.findOne(id);
    }
}

 

상품 예외

public class NotEnoughStockException extends RuntimeException{

    public NotEnoughStockException() {
        super();
    }

    public NotEnoughStockException(String message) {
        super(message);
    }

    public NotEnoughStockException(String message, Throwable cause) {
        super(message, cause);
    }

    public NotEnoughStockException(Throwable cause) {
        super(cause);
    }
}

 

 

 

실전! 스프링 부트와 JPA 활용1 - 웹 애플리케이션 개발 - 인프런