refact

src/backend/playlist-server/src/main/java/com/sgwannabe/playlistserver/playlist/service/AsyncDatabaseService.java

@@ -0,0 +1,26 @@
+package com.sgwannabe.playlistserver.playlist.service;
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import lombok.RequiredArgsConstructor;
+
+@Service
+@RequiredArgsConstructor
+public class AsyncDatabaseService {
+
+    private final PlaylistRepository playlistRepository;
+
+    @Async
+    @Transactional
+    public CompletableFuture<Playlist> savePlaylistAsync(Playlist playlist) {
+        Playlist savedPlaylist = playlistRepository.save(playlist);
+        return CompletableFuture.completedFuture(savedPlaylist);
+    }
+
+    @Async
+    @Transactional
+    public CompletableFuture<Void> deletePlaylistAsync(String id) {
+        playlistRepository.deleteById(id);
+        return CompletableFuture.completedFuture(null);
+    }
+}

src/backend/playlist-server/src/main/java/com/sgwannabe/playlistserver/playlist/service/CacheService.java

@@ -0,0 +1,23 @@
+package com.sgwannabe.playlistserver.playlist.service;
+
+@Service
+@RequiredArgsConstructor
+public class CacheService {
+    private final RedisTemplate<String, Playlist> redisTemplate;
+
+    public void cachePlaylist(Playlist playlist) {
+        String key = KeyGenerator.playlistKeyGenerate(playlist.getId());
+        redisTemplate.opsForValue().set(key, playlist, Duration.ofMinutes(10));
+    }
+
+    public Optional<PlaylistResponseDto> getCachedPlaylist(String id) {
+        String key = KeyGenerator.playlistKeyGenerate(id);
+        Playlist cachedPlaylist = redisTemplate.opsForValue().get(key);
+        return Optional.ofNullable(cachedPlaylist).map(converter::convert);
+    }
+
+    public void evictPlaylist(String id) {
+        String key = KeyGenerator.playlistKeyGenerate(id);
+        redisTemplate.delete(key);
+    }
+}

src/backend/playlist-server/src/main/java/com/sgwannabe/playlistserver/playlist/service/MusicService.java

@@ -0,0 +1,45 @@
+package com.sgwannabe.playlistserver.playlist.service;
+
+@Service
+@RequiredArgsConstructor
+public class MusicService {
+    private final FeignMusicClient musicClient;
+
+    public List<Music> getMusicsFromIds(List<Long> musicIds) {
+        BaseResponse<List<MusicDTO>> response = musicClient.getMusicFromIds(new MusicRetrieveRequestDTO(musicIds));
+        return response.getData().stream()
+                .map(this::convertToMusic)
+                .toList();
+    }
+
+    public Music createMusic(MusicRequestDto dto) {
+        return Music.builder()
+                .title(dto.getTitle())
+                .artistId(dto.getArtistId())
+                .artist(dto.getArtist())
+                .albumId(dto.getAlbumId())
+                .album(dto.getAlbum())
+                .thumbnail(dto.getThumbnail())
+                .playtime(dto.getPlaytime())
+                .build();
+    }
+
+    private Music convertToMusic(MusicDTO dto) {
+        return Music.builder()
+                .id(dto.getId())
+                .title(dto.getTitle())
+                .artistId(dto.getArtist().getId())
+                .artist(dto.getArtist().getName())
+                .albumId(dto.getAlbum().getId())
+                .album(dto.getAlbum().getTitle())
+                .thumbnail(dto.getAlbum().getCoverUrl())
+                .playtime(formatPlayTime(dto.getPlayTime()))
+                .build();
+    }
+
+    private String formatPlayTime(Short playTime) {
+        int min = playTime / 60;
+        int sec = playTime % 60;
+        return String.format("%02d:%02d", min, sec);
+    }
+}

src/backend/playlist-server/src/main/java/com/sgwannabe/playlistserver/playlist/service/PlaylistEventPublisher.java

@@ -0,0 +1,23 @@
+package com.sgwannabe.playlistserver.playlist.service;
+
+@Service
+@RequiredArgsConstructor
+public class PlaylistEventPublisher {
+    private final KafkaTemplate<String, PlaylistEvent> kafkaTemplate;
+
+    public void publishPlaylistCreated(Playlist playlist) {
+        PlaylistEvent event = new PlaylistEvent("CREATED", playlist.getId());
+        kafkaTemplate.send("playlist-events", event);
+    }
+
+    public void publishPlaylistDeleted(String playlistId) {
+        PlaylistEvent event = new PlaylistEvent("DELETED", playlistId);
+        kafkaTemplate.send("playlist-events", event);
+    }
+}
+
+public class PlaylistEvent {
+    private String eventType;
+    private String playlistId;
+
+}