[hotfix/#60] postgre 특성 고려한 트랜잭션 처리 추가

src/main/java/com/goormthon/backend/firstsori/domain/message/application/usecase/MessageUseCaseImpl.java

@@ -32,7 +32,6 @@
 @Slf4j
 @Service
 @RequiredArgsConstructor
-@Transactional
 public class MessageUseCaseImpl implements MessageUseCase {
 
     private final GetMessageService getMessageService;
@@ -42,6 +41,7 @@ public class MessageUseCaseImpl implements MessageUseCase {
     private final SaveMusicService saveMusicService;
     private final RedisTemplate<String, String> redisTemplate; // RedisTemplate 주입
 
+    @Transactional(readOnly = true)
     @Override
     public MessageResponse getMessage(UUID messageId) {
 
@@ -62,6 +62,7 @@ public PageResponse<MessageListResponse> getMessages(UUID userId, Pageable pagea
     }
 
     @Override
+    @Transactional
     public void createMessage(SaveMessageRequest request) {
 
         Board board = getBoardService.getBoardBySharedId(request.shareUri());

src/main/java/com/goormthon/backend/firstsori/domain/music/domain/service/SaveMusicService.java

@@ -8,20 +8,26 @@
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Propagation;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.transaction.support.TransactionSynchronizationAdapter;
 import org.springframework.transaction.support.TransactionSynchronizationManager;
 
 @Slf4j
 @Service
 @RequiredArgsConstructor
-@Transactional
 public class SaveMusicService {
 
     private final MusicRepository musicRepository;
     private final MusicEventProducer musicEventProducer;
     private final MusicAsyncService musicAsyncService;
 
+    /**
+     * music 저장 전용 트랜잭션
+     * - 중복 시 DB 유니크 제약에 의해 실패
+     * - 실패해도 상위 트랜잭션(message)은 영향받지 않도록 REQUIRES_NEW
+     */
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
     public Music saveMusic(Music music) {
         Music targetMusic;