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feat(product): 상품 도메인 모델 구현 및 재고/정렬 기능 추가
- Product 엔티티 구현 (재고, 좋아요 수 포함) - decreaseStock, increaseLikeCount 등 도메인 로직 추가 - ProductRepository 인터페이스 정의 - Product 단위/통합 테스트 작성
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‎apps/commerce-api/src/main/java/com/loopers/application/product/ProductDetailInfo.java‎

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package com.loopers.application.product;
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import com.loopers.domain.product.ProductDetail;
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/**
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* packageName : com.loopers.application.product
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* fileName : ProductDetail
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* author : byeonsungmun
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* date : 2025. 11. 13.
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* description :
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* ===========================================
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* DATE AUTHOR NOTE
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* -------------------------------------------
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* 2025. 11. 13. byeonsungmun 최초 생성
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*/
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public record ProductDetailInfo(
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Long id,
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String name,
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String brandName,
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Long price,
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Long likeCount
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) {
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public static ProductDetailInfo from(ProductDetail productDetail) {
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return new ProductDetailInfo(
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productDetail.getId(),
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productDetail.getName(),
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productDetail.getBrandName(),
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productDetail.getPrice(),
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productDetail.getLikeCount()
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);
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}
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}

‎apps/commerce-api/src/main/java/com/loopers/application/product/ProductFacade.java‎

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package com.loopers.application.product;
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import com.loopers.domain.brand.Brand;
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import com.loopers.domain.brand.BrandService;
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import com.loopers.domain.like.LikeService;
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import com.loopers.domain.product.ProductDetail;
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import com.loopers.domain.product.ProductDomainService;
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import com.loopers.domain.product.ProductService;
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import lombok.RequiredArgsConstructor;
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import org.springframework.data.domain.Page;
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import org.springframework.data.domain.Pageable;
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import org.springframework.stereotype.Component;
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/**
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* packageName : com.loopers.application.product
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* fileName : ProdcutFacade
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* author : byeonsungmun
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* date : 2025. 11. 10.
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* description :
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* ===========================================
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* DATE AUTHOR NOTE
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* -------------------------------------------
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* 2025. 11. 10. byeonsungmun 최초 생성
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*/
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@Component
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@RequiredArgsConstructor
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public class ProductFacade {
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private final ProductService productService;
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private final BrandService brandService;
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private final LikeService likeService;
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private final ProductDomainService productDomainService;
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public Page<ProductInfo> getProducts(Pageable pageable) {
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return productService.getProducts(pageable)
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.map(product -> {
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Brand brand = brandService.getBrand(product.getId());
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long likeCount = likeService.countByProductId(product.getId());
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return ProductInfo.of(product, brand, likeCount);
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});
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}
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public ProductDetailInfo getProduct(Long id) {
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ProductDetail productDetail = productDomainService.getProductDetail(id);
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return ProductDetailInfo.from(productDetail);
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}
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}

‎apps/commerce-api/src/main/java/com/loopers/application/product/ProductInfo.java‎

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package com.loopers.application.product;
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import com.loopers.domain.brand.Brand;
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import com.loopers.domain.product.Product;
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/**
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* packageName : com.loopers.application.product
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* fileName : ProductInfo
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* author : byeonsungmun
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* date : 2025. 11. 10.
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* description :
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* ===========================================
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* DATE AUTHOR NOTE
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* -------------------------------------------
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* 2025. 11. 10. byeonsungmun 최초 생성
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*/
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public record ProductInfo(
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Long id,
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String name,
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String brandName,
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Long price,
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Long likeCount
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) {
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public static ProductInfo of(Product product, Brand brand, Long likeCount) {
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return new ProductInfo(
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product.getId(),
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product.getName(),
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brand.getName(),
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product.getPrice(),
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likeCount
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);
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}
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}

‎apps/commerce-api/src/main/java/com/loopers/domain/product/Product.java‎

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package com.loopers.domain.product;
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import com.loopers.support.error.CoreException;
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import com.loopers.support.error.ErrorType;
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import jakarta.persistence.*;
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import lombok.Getter;
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/**
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* packageName : com.loopers.domain.product
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* fileName : Product
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* author : byeonsungmun
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* date : 2025. 11. 10.
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* description :
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* ===========================================
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* DATE AUTHOR NOTE
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* -------------------------------------------
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* 2025. 11. 10. byeonsungmun 최초 생성
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*/
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@Entity
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@Table(name = "product")
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@Getter
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public class Product {
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY)
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private Long id;
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@Column(name = "ref_brand_id", nullable = false)
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private Long brandId;
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@Column(nullable = false)
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private String name;
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@Column(nullable = false)
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private Long price;
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@Column
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private Long likeCount;
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@Column(nullable = false)
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private Long stock;
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protected Product() {}
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private Product(Long brandId, String name, Long price, Long likeCount, Long stock) {
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this.brandId = requireValidBrandId(brandId);
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this.name = requireValidName(name);
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this.price = requireValidPrice(price);
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this.likeCount = requireValidLikeCount(likeCount);
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this.stock = requireValidStock(stock);
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}
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public static Product create(Long brandId, String name, Long price, Long stock) {
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return new Product(
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brandId,
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name,
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price,
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0L,
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stock
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);
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}
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private Long requireValidBrandId(Long brandId) {
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if (brandId == null || brandId <= 0) {
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throw new CoreException(ErrorType.BAD_REQUEST, "브랜드 ID는 필수입니다.");
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}
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return brandId;
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}
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private String requireValidName(String name) {
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if (name == null || name.isEmpty()) {
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throw new CoreException(ErrorType.BAD_REQUEST, "상품명은 필수입니다.");
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}
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return name;
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}
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private Long requireValidPrice(Long price) {
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if (price == null || price < 0) {
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throw new CoreException(ErrorType.BAD_REQUEST, "상품 가격은 0원 이상이어야 합니다.");
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}
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return price;
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}
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public Long requireValidLikeCount(Long likeCount) {
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if (likeCount == null || likeCount < 0) {
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throw new CoreException(ErrorType.BAD_REQUEST, "좋아요 개수는 0개 미만으로 설정할 수 없습니다.");
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}
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return likeCount;
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}
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private Long requireValidStock(Long stock) {
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if (stock < 0) {
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throw new CoreException(ErrorType.BAD_REQUEST, "상품 재고는 0 미만으로 설정할 수 없습니다.");
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}
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return stock;
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}
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public void increaseLikeCount() {
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this.likeCount++;
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}
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public void decreaseLikeCount() {
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if (this.likeCount > 0) this.likeCount--;
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}
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public void decreaseStock(Long quantity) {
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if (quantity <= 0) {
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throw new CoreException(ErrorType.BAD_REQUEST, "차감 수량은 0보다 커야 합니다.");
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}
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if (this.stock - quantity < 0) {
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throw new CoreException(ErrorType.BAD_REQUEST, "재고가 부족합니다.");
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}
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this.stock -= quantity;
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}
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}

‎apps/commerce-api/src/main/java/com/loopers/domain/product/ProductDetail.java‎

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package com.loopers.domain.product;
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import com.loopers.domain.brand.Brand;
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import lombok.Getter;
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/**
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* packageName : com.loopers.domain.product
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* fileName : ProductDetail
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* author : byeonsungmun
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* date : 2025. 11. 13.
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* description :
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* ===========================================
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* DATE AUTHOR NOTE
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* -------------------------------------------
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* 2025. 11. 13. byeonsungmun 최초 생성
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*/
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@Getter
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public class ProductDetail {
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private Long id;
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private String name;
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private String brandName;
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private Long price;
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private Long likeCount;
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protected ProductDetail() {}
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private ProductDetail(Long id, String name, String brandName, Long price, Long likeCount) {
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this.id = id;
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this.name = name;
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this.brandName = brandName;
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this.price = price;
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this.likeCount = likeCount;
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}
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public static ProductDetail of(Product product, Brand brand, Long likeCount) {
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return new ProductDetail(
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product.getId(),
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product.getName(),
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brand.getName(),
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product.getPrice(),
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likeCount
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);
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}
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}

‎apps/commerce-api/src/main/java/com/loopers/domain/product/ProductDomainService.java‎

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package com.loopers.domain.product;
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import com.loopers.domain.brand.Brand;
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import com.loopers.domain.brand.BrandRepository;
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import com.loopers.domain.like.LikeRepository;
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import com.loopers.support.error.CoreException;
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import com.loopers.support.error.ErrorType;
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import lombok.RequiredArgsConstructor;
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import org.springframework.stereotype.Component;
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/**
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* packageName : com.loopers.domain.product
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* fileName : ProductDetailService
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* author : byeonsungmun
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* date : 2025. 11. 13.
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* description :
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* ===========================================
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* DATE AUTHOR NOTE
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* -------------------------------------------
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* 2025. 11. 13. byeonsungmun 최초 생성
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*/
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@Component
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@RequiredArgsConstructor
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public class ProductDomainService {
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private final ProductRepository productRepository;
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private final BrandRepository brandRepository;
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private final LikeRepository likeRepository;
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public ProductDetail getProductDetail(Long id) {
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Product product = productRepository.findById(id)
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.orElseThrow(() -> new CoreException(ErrorType.NOT_FOUND, "상품을 찾을 수 없습니다."));
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Brand brand = brandRepository.findById(product.getBrandId())
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.orElseThrow(() -> new CoreException(ErrorType.NOT_FOUND, "브랜드를 찾을 수 없습니다"));
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long likeCount = likeRepository.countByProductId(id);
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return ProductDetail.of(product, brand, likeCount);
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}
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}

‎apps/commerce-api/src/main/java/com/loopers/domain/product/ProductRepository.java‎

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package com.loopers.domain.product;
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import org.springframework.data.domain.Page;
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import org.springframework.data.domain.Pageable;
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import java.util.Optional;
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/**
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* packageName : com.loopers.domain.product
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* fileName : ProductRepositroy
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* author : byeonsungmun
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* date : 2025. 11. 12.
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* description :
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* ===========================================
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* DATE AUTHOR NOTE
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* -------------------------------------------
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* 2025. 11. 12. byeonsungmun 최초 생성
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*/
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public interface ProductRepository {
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Page<Product> findAll(Pageable pageable);
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Optional<Product> findById(Long id);
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void incrementLikeCount(Long productId);
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void decrementLikeCount(Long productId);
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Product save(Product product);
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}

‎apps/commerce-api/src/main/java/com/loopers/domain/product/ProductService.java‎

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package com.loopers.domain.product;
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import com.loopers.support.error.CoreException;
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import com.loopers.support.error.ErrorType;
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import lombok.RequiredArgsConstructor;
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import org.springframework.data.domain.Page;
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import org.springframework.data.domain.Pageable;
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import org.springframework.stereotype.Component;
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import org.springframework.transaction.annotation.Transactional;
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/**
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* packageName : com.loopers.domain.product
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* fileName : ProductService
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* author : byeonsungmun
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* date : 2025. 11. 12.
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* description :
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* ===========================================
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* DATE AUTHOR NOTE
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* -------------------------------------------
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* 2025. 11. 12. byeonsungmun 최초 생성
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*/
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@Component
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@RequiredArgsConstructor
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public class ProductService {
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private final ProductRepository productRepository;
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@Transactional(readOnly = true)
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public Page<Product> getProducts(Pageable pageable) {
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return productRepository.findAll(pageable);
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}
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public Product getProduct(Long productId) {
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return productRepository.findById(productId)
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.orElseThrow(() -> new CoreException(ErrorType.NOT_FOUND, "해당 상품이 없습니다"));
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}
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}
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