refactor: redis List자료구조에 ttl 설정하기

- 한 게임당 최대 300초가 넘지 않는다고 판단하여 300으로 설정 -> 추후 논의 필요

- 한 문제가 지날 때마다 List key를 삭제

src/main/kotlin/yjh/cstar/engine/application/GameEngineService.kt

@@ -12,6 +12,7 @@ import yjh.cstar.game.presentation.request.RankingCreateRequest
 import yjh.cstar.game.presentation.response.QuizInfoResponse
 import yjh.cstar.game.presentation.response.RankingResponse
 import yjh.cstar.quiz.domain.Quiz
+import yjh.cstar.util.RedisUtil
 import yjh.cstar.websocket.application.BroadCastService
 import java.time.LocalDateTime
 
@@ -25,6 +26,7 @@ class GameEngineService(
     private val answerValidationService: AnswerValidationService,
     private val broadCastService: BroadCastService,
     private val redisRankingService: RedisRankingService,
+    private val redisUtil: RedisUtil,
 ) {
 
     companion object {
@@ -58,6 +60,8 @@ class GameEngineService(
                 QuizInfoResponse(quiz.id, quiz.question)
             )
 
+            redisUtil.delete("roomId : " + roomId + ", " + "quizId : " + quiz.id)
+
             val startTime = System.currentTimeMillis()
             var notExistWinner = true
             while (checkTimeIn(startTime) && notExistWinner) {

src/main/kotlin/yjh/cstar/util/RedisUtil.kt

@@ -9,8 +9,12 @@ class RedisUtil(
     private val redisTemplate: RedisTemplate<String, String>,
 ) {
 
-    fun rpush(key: String, value: String): Long? {
-        return redisTemplate.opsForList().rightPush(key, value)
+    fun rpush(key: String, value: String, ttl: Long? = 9999): Long? {
+        val listSize = redisTemplate.opsForList().rightPush(key, value)
+        ttl?.let {
+            redisTemplate.expire(key, ttl, TimeUnit.SECONDS)
+        }
+        return listSize
     }
 
     fun lpop(key: String, timeout: Long = 60, timeUnit: TimeUnit = TimeUnit.SECONDS): String? {

src/main/kotlin/yjh/cstar/websocket/infrastructure/GameAnswerPushRepositoryAdapter.kt

@@ -19,6 +19,7 @@ class GameAnswerPushRepositoryAdapter(
         val key = "roomId : " + roomId.toString() + ", " + "quizId : " + quizId.toString()
         val answerResultEntity = AnswerResultEntity.from(answerResult)
         val value = objectMapper.writeValueAsString(answerResultEntity)
-        redisUtil.rpush(key, value)
+        val ttl = 300L
+        redisUtil.rpush(key, value, ttl)
     }
 }