feature: 상품 상세 정보에 랭킹 데이터 추가

- `RankingService` 메서드 `getProductRank` 구현으로 Redis 기반 상품 랭킹 조회 지원
- 상품 상세 조회 시 현재 랭킹 정보를 포함하도록 `ProductInfo` 및 `ProductFacade` 수정
- 기존 `RankingService` 패키지 위치를 `infrastructure`로 변경하여 관리 개선

Author: yeonjiyeon

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

@@ -3,6 +3,7 @@
 import com.loopers.domain.brand.BrandService;
 import com.loopers.domain.product.Product;
 import com.loopers.domain.product.ProductService;
+import com.loopers.infrastructure.rank.RankingService;
 import com.loopers.event.ProductViewEvent;
 import lombok.RequiredArgsConstructor;
 import org.springframework.context.ApplicationEventPublisher;
@@ -16,14 +17,15 @@ public class ProductFacade {
 
   private final ProductService productService;
   private final BrandService brandService;
+  private final RankingService rankingService;
   private final ApplicationEventPublisher eventPublisher;
 
   public Page<ProductInfo> getProductsInfo(Pageable pageable) {
     Page<Product> products = productService.getProducts(pageable);
     return products.map(product -> {
       String brandName = brandService.getBrand(product.getBrandId())
           .getName();
-      return ProductInfo.from(product, brandName);
+      return ProductInfo.from(product, brandName, null);
     });
   }
 
@@ -32,9 +34,11 @@ public ProductInfo getProductInfo(long id) {
     String brandName = brandService.getBrand(product.getBrandId())
         .getName();
 
+    Integer currentRank = rankingService.getProductRank(id);
+
     eventPublisher.publishEvent(ProductViewEvent.from(id));
 
-    return ProductInfo.from(product, brandName);
+    return ProductInfo.from(product, brandName, currentRank);
   }
 
 }

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

@@ -8,25 +8,28 @@ public record ProductInfo(
     String name,
     Money price,
     String brandName,
-    int likeCount
+    int likeCount,
+    Integer currentRank
 ) {
   public static ProductInfo from(Product product) {
     return new ProductInfo(
         product.getId(),
         product.getName(),
         product.getPrice(),
         null,
-        product.getLikeCount()
+        product.getLikeCount(),
+        null
     );
   }
 
-  public static ProductInfo from(Product product, String brandName) {
+  public static ProductInfo from(Product product, String brandName, Integer currentRank) {
     return new ProductInfo(
         product.getId(),
         product.getName(),
         product.getPrice(),
         brandName,
-        product.getLikeCount()
+        product.getLikeCount(),
+        currentRank
     );
   }
 }

apps/commerce-api/src/main/java/com/loopers/application/rank/RankingFacade.java

@@ -2,7 +2,7 @@
 
 import com.loopers.domain.product.Product;
 import com.loopers.domain.product.ProductService;
-import com.loopers.domain.rank.RankingService;
+import com.loopers.infrastructure.rank.RankingService;
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;

…/loopers/domain/rank/RankingService.java …/infrastructure/rank/RankingService.javaapps/commerce-api/src/main/java/com/loopers/domain/rank/RankingService.java renamed to apps/commerce-api/src/main/java/com/loopers/infrastructure/rank/RankingService.java apps/commerce-api/src/main/java/com/loopers/domain/rank/RankingService.java renamed to apps/commerce-api/src/main/java/com/loopers/infrastructure/rank/RankingService.java

@@ -1,5 +1,7 @@
-package com.loopers.domain.rank;
+package com.loopers.infrastructure.rank;
 
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 import java.util.List;
 import java.util.Set;
 import lombok.RequiredArgsConstructor;
@@ -27,4 +29,13 @@ public List<Long> getTopRankingIds(String date, int page, int size) {
         .map(Long::valueOf)
         .toList();
   }
+
+  public Integer getProductRank(Long productId) {
+    String today = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMdd"));
+    String key = "ranking:all:" + today;
+
+    Long rank = redisTemplate.opsForZSet().reverseRank(key, String.valueOf(productId));
+
+    return (rank != null) ? rank.intValue() + 1 : null;
+  }
 }