fix(live-room): 최근 종료 라이브 조회와 캐시 무효화를 최적화한다

docs/20260227_최근종료라이브최적화.md

@@ -0,0 +1,17 @@
+# 최근 종료 라이브(getLatestFinishedLive) 최적화
+
+- [x] `getLatestFinishedLive` 조회를 DB 단계에서 차단 관계(`left join`)로 필터링하도록 변경
+- [x] 조회 결과를 `GetLatestFinishedLiveResponse`로 QueryProjection 하여 서비스 단 추가 `map` 제거
+- [x] 회원 차단(`memberBlock`) / 차단해제(`memberUnBlock`) 시 최근 종료 라이브 캐시 무효화 적용
+- [x] 정적 진단 및 테스트/빌드 검증 수행
+- [x] 검증 기록 작성
+
+## 검증 기록
+
+### 1차 구현
+- 무엇을: `getLatestFinishedLive`를 서비스 후처리(`filter`/`map`)에서 제거하고, `LiveRoomRepository`에서 `leftJoin(blockMember)` + `blockMember.id.isNull` 조건으로 차단 관계를 DB 단계에서 제외하도록 변경했다. 또한 `GetLatestFinishedLiveResponse`에 `@QueryProjection` 생성자를 추가해 쿼리 결과를 응답 DTO로 바로 생성했다. 마지막으로 `memberBlock`/`memberUnBlock`에서 `getLatestFinishedLive:{memberId}` 캐시를 즉시 evict 하도록 반영했다.
+- 왜: 기존 로직은 조회 후 애플리케이션 레벨에서 차단 여부를 반복 조회하고 별도 `map`을 수행해 비용이 컸고, 차단/차단해제 직후 최근 종료 라이브 캐시가 TTL 만료 전까지 stale 상태가 될 수 있어 DB 레벨 필터링 및 이벤트성 캐시 무효화가 필요했다.
+- 어떻게:
+  - `lsp_diagnostics` (대상: `GetLatestFinishedLiveResponse.kt`, `LiveRoomRepository.kt`, `LiveRoomService.kt`, `MemberService.kt`) 실행 결과: **환경상 Kotlin LSP 미구성으로 진단 불가**
+  - `./gradlew test && ./gradlew build` 실행 결과: **성공 (BUILD SUCCESSFUL)**
+  - `./gradlew tasks --all` 실행 결과: **성공 (BUILD SUCCESSFUL)**

src/main/kotlin/kr/co/vividnext/sodalive/live/room/GetLatestFinishedLiveResponse.kt

@@ -6,13 +6,6 @@ import kr.co.vividnext.sodalive.extensions.getTimeAgoString
 import java.time.LocalDateTime
 import java.time.ZoneId
 
-data class GetLatestFinishedLiveQueryResponse @QueryProjection constructor(
-    val memberId: Long,
-    val nickname: String,
-    val profileImageUrl: String,
-    val updatedAt: LocalDateTime
-)
-
 data class GetLatestFinishedLiveResponse(
     @JsonProperty("memberId") val memberId: Long,
     @JsonProperty("nickname") val nickname: String,
@@ -20,12 +13,18 @@ data class GetLatestFinishedLiveResponse(
     @JsonProperty("timeAgo") val timeAgo: String,
     @JsonProperty("dateUtc") val dateUtc: String
 ) {
-    constructor(response: GetLatestFinishedLiveQueryResponse) : this(
-        response.memberId,
-        response.nickname,
-        response.profileImageUrl,
-        response.updatedAt.getTimeAgoString(),
-        response.updatedAt
+    @QueryProjection
+    constructor(
+        memberId: Long,
+        nickname: String,
+        profileImageUrl: String,
+        updatedAt: LocalDateTime
+    ) : this(
+        memberId,
+        nickname,
+        profileImageUrl,
+        updatedAt.getTimeAgoString(),
+        updatedAt
             .atZone(ZoneId.of("UTC"))
             .toInstant()
             .toString()

src/main/kotlin/kr/co/vividnext/sodalive/live/room/LiveRoomRepository.kt

@@ -66,7 +66,7 @@ interface LiveRoomQueryRepository {
     fun getTotalHeartCount(roomId: Long): Int?
     fun getLiveRoomCreatorId(roomId: Long): Long?
     fun getHeartList(roomId: Long): List<GetLiveRoomHeartListItem>
-    fun getLatestFinishedLive(): List<GetLatestFinishedLiveQueryResponse>
+    fun getLatestFinishedLive(memberId: Long?): List<GetLatestFinishedLiveResponse>
 }
 
 class LiveRoomQueryRepositoryImpl(
@@ -486,10 +486,16 @@ class LiveRoomQueryRepositoryImpl(
             .fetch()
     }
 
-    override fun getLatestFinishedLive(): List<GetLatestFinishedLiveQueryResponse> {
-        return queryFactory
+    override fun getLatestFinishedLive(memberId: Long?): List<GetLatestFinishedLiveResponse> {
+        var where = liveRoom.isActive.isFalse
+            .and(liveRoom.channelName.isNotNull)
+            .and(liveRoom.updatedAt.goe(LocalDateTime.now().minusWeeks(1)))
+            .and(member.isActive.isTrue)
+            .and(member.role.eq(MemberRole.CREATOR))
+
+        var select = queryFactory
             .select(
-                QGetLatestFinishedLiveQueryResponse(
+                QGetLatestFinishedLiveResponse(
                     member.id,
                     member.nickname,
                     member.profileImage.prepend("/").prepend(cloudFrontHost),
@@ -498,13 +504,24 @@ class LiveRoomQueryRepositoryImpl(
             )
             .from(liveRoom)
             .innerJoin(liveRoom.member, member)
-            .where(
-                liveRoom.isActive.isFalse
-                    .and(liveRoom.channelName.isNotNull)
-                    .and(liveRoom.updatedAt.goe(LocalDateTime.now().minusWeeks(1)))
-                    .and(member.isActive.isTrue)
-                    .and(member.role.eq(MemberRole.CREATOR))
+
+        if (memberId != null) {
+            val blockMemberCondition = blockMember.isActive.isTrue
+                .and(
+                    blockMember.member.id.eq(member.id)
+                        .and(blockMember.blockedMember.id.eq(memberId))
+                        .or(
+                            blockMember.member.id.eq(memberId)
+                                .and(blockMember.blockedMember.id.eq(member.id))
                         )
+                )
+
+            select = select.leftJoin(blockMember).on(blockMemberCondition)
+            where = where.and(blockMember.id.isNull)
+        }
+
+        return select
+            .where(where)
             .groupBy(member.id)
             .orderBy(liveRoom.updatedAt.max().desc())
             .limit(20)

src/main/kotlin/kr/co/vividnext/sodalive/live/room/LiveRoomService.kt

@@ -1444,20 +1444,9 @@ class LiveRoomService(
     @Transactional(readOnly = true)
     @Cacheable(
         cacheNames = ["cache_ttl_10_minutes"],
-        key = "'getLatestFinishedLive:' + (#member ?: 'guest')"
+        key = "'getLatestFinishedLive:' + (#member?.id ?: 'guest')"
     )
     fun getLatestFinishedLive(member: Member?): List<GetLatestFinishedLiveResponse> {
-        return repository.getLatestFinishedLive()
-            .filter {
-                if (member?.id != null) {
-                    !blockMemberRepository.isBlocked(blockedMemberId = member.id!!, memberId = it.memberId) &&
-                        !blockMemberRepository.isBlocked(blockedMemberId = it.memberId, memberId = member.id!!)
-                } else {
-                    true
-                }
-            }
-            .map {
-                GetLatestFinishedLiveResponse(response = it)
-            }
+        return repository.getLatestFinishedLive(memberId = member?.id)
     }
 }

src/main/kotlin/kr/co/vividnext/sodalive/member/MemberService.kt

@@ -120,6 +120,7 @@ class MemberService(
     private val tokenLocks: MutableMap<Long, ReentrantReadWriteLock> = mutableMapOf()
 
     private val recommendLiveCacheKeyPrefix = "getRecommendLive:"
+    private val latestFinishedLiveCacheKeyPrefix = "getLatestFinishedLive:"
 
     @Transactional
     fun signUpV2(request: SignUpRequestV2): SignUpResponse {
@@ -564,7 +565,11 @@ class MemberService(
         }
 
         evictRecommendLiveCache(memberId)
-        blockTargetMemberIds.forEach { evictRecommendLiveCache(it) }
+        evictLatestFinishedLiveCache(memberId)
+        blockTargetMemberIds.forEach {
+            evictRecommendLiveCache(it)
+            evictLatestFinishedLiveCache(it)
+        }
     }
 
     @Transactional
@@ -580,6 +585,8 @@ class MemberService(
 
         evictRecommendLiveCache(memberId)
         evictRecommendLiveCache(request.blockMemberId)
+        evictLatestFinishedLiveCache(memberId)
+        evictLatestFinishedLiveCache(request.blockMemberId)
     }
 
     fun isBlocked(blockedMemberId: Long, memberId: Long) = blockMemberRepository.isBlocked(blockedMemberId, memberId)
@@ -843,6 +850,10 @@ class MemberService(
         cacheManager.getCache("cache_ttl_3_hours")?.evict(recommendLiveCacheKeyPrefix + memberId)
     }
 
+    private fun evictLatestFinishedLiveCache(memberId: Long) {
+        cacheManager.getCache("cache_ttl_10_minutes")?.evict(latestFinishedLiveCacheKeyPrefix + memberId)
+    }
+
     @Transactional
     fun updateMarketingInfo(memberId: Long, adid: String, pid: String): String? {
         val member = repository.findByIdOrNull(id = memberId)