Fix: 서비스 관련 Conflict 해결

src/main/java/com/gdsc_knu/official_homepage/service/post/PostService.java

@@ -1,16 +1,8 @@
 package com.gdsc_knu.official_homepage.service.post;
 
 import com.gdsc_knu.official_homepage.dto.post.PostResponse;
-import com.gdsc_knu.official_homepage.entity.post.Post;
+import com.gdsc_knu.official_homepage.dto.post.PostRequest;
 import com.gdsc_knu.official_homepage.entity.post.enumeration.Category;
-import com.gdsc_knu.official_homepage.repository.PostRepository;
-import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
-import org.springframework.cache.annotation.CacheEvict;
-import org.springframework.cache.annotation.Cacheable;
-import org.springframework.scheduling.annotation.Scheduled;
-import org.springframework.stereotype.Service;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
 

src/main/java/com/gdsc_knu/official_homepage/service/post/PostServiceImpl.java

@@ -11,12 +11,17 @@
 import com.gdsc_knu.official_homepage.repository.MemberRepository;
 import com.gdsc_knu.official_homepage.repository.PostRepository;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.cache.annotation.CacheEvict;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
 
 @Service
+@Slf4j
 @RequiredArgsConstructor
 public class PostServiceImpl implements PostService {
     private final PostRepository postRepository;
@@ -112,4 +117,22 @@ public void deletePost(Long memberId, Long postId) {
         }
         postRepository.delete(post);
     }
+
+    @Override
+    @Transactional(readOnly = true)
+    @Cacheable(value = "trending-post", key = "'Is '+#category", unless="#result.size()<5")
+    public List<PostResponse.Main> getTrendingPosts(Category category, int size) {
+        List<Post> posts = postRepository.findTop5ByCategory(category, size);
+        return posts.stream().map(PostResponse.Main::from).toList();
+    }
+
+    @Scheduled(cron = "0 0 0 * * ?")
+    public void invokeClearPost() {
+        clearTrendingPosts();
+    }
+
+    @CacheEvict(value = "trending-post", allEntries = true, beforeInvocation = true)
+    public void clearTrendingPosts() {
+        log.info("trending post 초기화");
+    }
 }