콘텐츠 테마 번역 N+1 제거

- 온라인 경로에서 콘텐츠 테마 번역을 배치 조회/번역/저장으로 처리.
- 기존 번역은 IN 조회, 미번역만 한 번의 번역 요청 후 저장.
- 결과 순서 보전, 번역 누락/실패 시 원문으로 폴백.
- 공개 API 변경 없음.

src/main/kotlin/kr/co/vividnext/sodalive/content/theme/AudioContentThemeQueryRepository.kt

@@ -15,6 +15,10 @@ class AudioContentThemeQueryRepository(
     @Value("\${cloud.aws.cloud-front.host}")
     private val cloudFrontHost: String
 ) {
+    data class ThemeIdAndName(
+        val id: Long,
+        val theme: String
+    )
     fun getActiveThemes(): List<GetAudioContentThemeResponse> {
         return queryFactory
             .select(
@@ -88,6 +92,69 @@ class AudioContentThemeQueryRepository(
         return query.fetch()
     }
 
+    fun getActiveThemeWithIdsOfContent(
+        isAdult: Boolean = false,
+        isFree: Boolean = false,
+        isPointAvailableOnly: Boolean = false,
+        contentType: ContentType
+    ): List<ThemeIdAndName> {
+        var where = audioContent.isActive.isTrue
+            .and(audioContentTheme.isActive.isTrue)
+
+        if (!isAdult) {
+            where = where.and(audioContent.isAdult.isFalse)
+        } else {
+            if (contentType != ContentType.ALL) {
+                where = where.and(
+                    audioContent.member.isNull.or(
+                        audioContent.member.auth.gender.eq(
+                            if (contentType == ContentType.MALE) {
+                                0
+                            } else {
+                                1
+                            }
+                        )
+                    )
+                )
+            }
+        }
+
+        if (isFree) {
+            where = where.and(audioContent.price.loe(0))
+        }
+
+        if (isPointAvailableOnly) {
+            where = where.and(audioContent.isPointAvailable.isTrue)
+        }
+
+        val query = queryFactory
+            .select(audioContentTheme.id, audioContentTheme.theme)
+            .from(audioContent)
+            .innerJoin(audioContent.member, member)
+            .innerJoin(audioContent.theme, audioContentTheme)
+            .where(where)
+            .groupBy(audioContentTheme.id)
+
+        if (isFree) {
+            query.orderBy(
+                CaseBuilder()
+                    .`when`(audioContentTheme.theme.eq("자기소개")).then(0)
+                    .otherwise(1)
+                    .asc(),
+                audioContentTheme.orders.asc()
+            )
+        } else {
+            query.orderBy(audioContentTheme.orders.asc())
+        }
+
+        return query.fetch().map { tuple ->
+            ThemeIdAndName(
+                id = tuple.get(audioContentTheme.id)!!,
+                theme = tuple.get(audioContentTheme.theme)!!
+            )
+        }
+    }
+
     fun findThemeByIdAndActive(id: Long): AudioContentTheme? {
         return queryFactory
             .selectFrom(audioContentTheme)

src/main/kotlin/kr/co/vividnext/sodalive/content/theme/AudioContentThemeService.kt

@@ -5,6 +5,12 @@ import kr.co.vividnext.sodalive.content.AudioContentRepository
 import kr.co.vividnext.sodalive.content.ContentType
 import kr.co.vividnext.sodalive.content.SortType
 import kr.co.vividnext.sodalive.content.theme.content.GetContentByThemeResponse
+import kr.co.vividnext.sodalive.content.theme.translation.ContentThemeTranslation
+import kr.co.vividnext.sodalive.content.theme.translation.ContentThemeTranslationRepository
+import kr.co.vividnext.sodalive.i18n.Lang
+import kr.co.vividnext.sodalive.i18n.LangContext
+import kr.co.vividnext.sodalive.i18n.translation.PapagoTranslationService
+import kr.co.vividnext.sodalive.i18n.translation.TranslateRequest
 import kr.co.vividnext.sodalive.member.Member
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
@@ -12,26 +18,94 @@ import org.springframework.transaction.annotation.Transactional
 @Service
 class AudioContentThemeService(
     private val queryRepository: AudioContentThemeQueryRepository,
-    private val contentRepository: AudioContentRepository
+    private val contentRepository: AudioContentRepository,
+    private val contentThemeTranslationRepository: ContentThemeTranslationRepository,
+
+    private val papagoTranslationService: PapagoTranslationService,
+    private val langContext: LangContext
 ) {
     @Transactional(readOnly = true)
     fun getThemes(): List<GetAudioContentThemeResponse> {
         return queryRepository.getActiveThemes()
     }
 
-    @Transactional(readOnly = true)
+    @Transactional
     fun getActiveThemeOfContent(
         isAdult: Boolean = false,
         isFree: Boolean = false,
         isPointAvailableOnly: Boolean = false,
         contentType: ContentType
     ): List<String> {
-        return queryRepository.getActiveThemeOfContent(
+        val themesWithIds = queryRepository.getActiveThemeWithIdsOfContent(
             isAdult = isAdult,
             isFree = isFree,
             isPointAvailableOnly = isPointAvailableOnly,
             contentType = contentType
         )
+
+        /**
+         * langContext.lang == Lang.EN || Lang.JA 일 때 번역된 콘텐츠 테마 반환
+         * 번역이 없으면 번역 API 호출 후 저장하고 반환
+         */
+        val currentLang = langContext.lang
+        if (currentLang == Lang.EN || currentLang == Lang.JA) {
+            val targetLocale = currentLang.code
+            // 1) 기존 번역을 한 번에 조회
+            val ids = themesWithIds.map { it.id }
+            val existingTranslations = if (ids.isNotEmpty()) {
+                contentThemeTranslationRepository.findByContentThemeIdInAndLocale(ids, targetLocale)
+            } else {
+                emptyList()
+            }
+
+            val existingMap = existingTranslations.associateBy { it.contentThemeId }
+
+            // 2) 미번역 항목만 수집하여 한 번에 번역 요청
+            val untranslatedPairs = themesWithIds.filter { existingMap[it.id] == null }
+
+            if (untranslatedPairs.isNotEmpty()) {
+                val texts = untranslatedPairs.map { it.theme }
+
+                val response = papagoTranslationService.translate(
+                    request = TranslateRequest(
+                        texts = texts,
+                        sourceLanguage = "ko",
+                        targetLanguage = targetLocale
+                    )
+                )
+
+                val translatedTexts = response.translatedText
+                val entitiesToSave = mutableListOf<ContentThemeTranslation>()
+
+                // translatedTexts 크기가 다르면 안전하게 원문으로 대체
+                untranslatedPairs.forEachIndexed { index, pair ->
+                    val translated = translatedTexts.getOrNull(index) ?: pair.theme
+                    entitiesToSave.add(
+                        ContentThemeTranslation(
+                            contentThemeId = pair.id,
+                            locale = targetLocale,
+                            theme = translated
+                        )
+                    )
+                }
+
+                if (entitiesToSave.isNotEmpty()) {
+                    contentThemeTranslationRepository.saveAll(entitiesToSave)
+                }
+
+                // 저장 후 맵을 갱신
+                entitiesToSave.forEach { entity ->
+                    (existingMap as MutableMap)[entity.contentThemeId] = entity
+                }
+            }
+
+            // 3) 원래 순서대로 결과 조립 (번역 없으면 원문 fallback)
+            return themesWithIds.map { pair ->
+                existingMap[pair.id]?.theme ?: pair.theme
+            }
+        }
+
+        return themesWithIds.map { it.theme }
     }
 
     @Transactional(readOnly = true)

src/main/kotlin/kr/co/vividnext/sodalive/content/theme/translation/ContentThemeTranslationRepository.kt

@@ -4,4 +4,6 @@ import org.springframework.data.jpa.repository.JpaRepository
 
 interface ContentThemeTranslationRepository : JpaRepository<ContentThemeTranslation, Long> {
     fun findByContentThemeIdAndLocale(contentThemeId: Long, locale: String): ContentThemeTranslation?
+
+    fun findByContentThemeIdInAndLocale(contentThemeIds: Collection<Long>, locale: String): List<ContentThemeTranslation>
 }