[Artist] Redis 도입 및 SpotifyService 리팩토링

src/main/java/com/back/web7_9_codecrete_be/domain/artists/dto/response/SpotifyArtistDetailCache.java

@@ -0,0 +1,21 @@
+package com.back.web7_9_codecrete_be.domain.artists.dto.response;
+
+import java.util.List;
+
+// Spotify 아티스트 상세 정보 캐시용 DTO - Redis에 저장하기 위한 데이터 구조
+
+public record SpotifyArtistDetailCache(
+        // 아티스트 기본 정보
+        String artistName,
+        String profileImageUrl,
+        double popularity,
+
+        // Top Tracks (상위 10개)
+        List<TopTrackResponse> topTracks,
+
+        // 앨범 목록 (최대 20개)
+        List<AlbumResponse> albums,
+        int totalAlbums
+) {
+}
+

src/main/java/com/back/web7_9_codecrete_be/domain/artists/repository/ArtistRepository.java

@@ -5,6 +5,7 @@
 import org.springframework.data.domain.Slice;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
 
 import java.util.List;
@@ -14,6 +15,15 @@ public interface ArtistRepository extends JpaRepository<Artist, Long> {
     boolean existsBySpotifyArtistId(String spotifyArtistId);
     java.util.Optional<Artist> findBySpotifyArtistId(String spotifyArtistId);
 
+    // 아티스트 상세 조회용 - artistGenres와 genre를 fetch join하여 N+1 문제 방지
+    @Query("""
+        SELECT DISTINCT a FROM Artist a
+        LEFT JOIN FETCH a.artistGenres ag
+        LEFT JOIN FETCH ag.genre
+        WHERE a.id = :id
+    """)
+    java.util.Optional<Artist> findByIdWithArtistGenres(@Param("id") Long id);
+
     @Query("SELECT a FROM Artist a WHERE a.nameKo IS NULL ORDER BY a.id ASC")
     List<Artist> findByNameKoIsNullOrderByIdAsc(Pageable pageable);
 

src/main/java/com/back/web7_9_codecrete_be/domain/artists/service/ArtistService.java

@@ -7,7 +7,6 @@
 import com.back.web7_9_codecrete_be.domain.artists.repository.ArtistRepository;
 import com.back.web7_9_codecrete_be.domain.artists.repository.ArtistLikeRepository;
 import com.back.web7_9_codecrete_be.domain.artists.repository.ConcertArtistRepository;
-import com.back.web7_9_codecrete_be.domain.artists.service.spotifyService.SpotifyService;
 import com.back.web7_9_codecrete_be.domain.concerts.entity.Concert;
 import com.back.web7_9_codecrete_be.domain.concerts.repository.ConcertRepository;
 import com.back.web7_9_codecrete_be.domain.concerts.service.ConcertService;
@@ -46,7 +45,7 @@ public Artist findArtist(Long artistId) {
 
     @Transactional
     public int setArtist() {
-        return spotifyService.seedKoreanArtists300();
+        return spotifyService.seedKoreanArtists();
     }
 
     @Transactional
@@ -97,7 +96,7 @@ public Slice<ArtistListResponse> listArtist(Pageable pageable, User user, Artist
 
     @Transactional(readOnly = true)
     public ArtistDetailResponse getArtistDetail(Long artistId) {
-        Artist artist = artistRepository.findById(artistId)
+        Artist artist = artistRepository.findByIdWithArtistGenres(artistId)
                 .orElseThrow(() -> new BusinessException(ArtistErrorCode.ARTIST_NOT_FOUND));
 
         if (artist.getSpotifyArtistId() == null) {