feat(audio-recommendation): 추천 snapshot 스케줄러를 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/v2/audio/recommendation/adapter/out/scheduler/AudioRecommendationSnapshotScheduler.kt

@@ -0,0 +1,32 @@
+package kr.co.vividnext.sodalive.v2.audio.recommendation.adapter.out.scheduler
+
+import kr.co.vividnext.sodalive.v2.audio.recommendation.application.AudioRecommendationSnapshotRefreshService
+import org.redisson.api.RedissonClient
+import org.springframework.scheduling.annotation.Scheduled
+import org.springframework.stereotype.Component
+import java.util.concurrent.TimeUnit
+
+@Component
+class AudioRecommendationSnapshotScheduler(
+    private val refreshService: AudioRecommendationSnapshotRefreshService,
+    private val redissonClient: RedissonClient
+) {
+    @Scheduled(cron = "0 0 0 * * *", zone = "Asia/Seoul")
+    fun refreshDailySnapshots() {
+        val lock = redissonClient.getLock(LOCK_KEY)
+
+        try {
+            if (lock.tryLock(0, -1, TimeUnit.SECONDS)) {
+                refreshService.refreshDailySnapshots()
+            }
+        } finally {
+            if (lock.isHeldByCurrentThread) {
+                lock.unlock()
+            }
+        }
+    }
+
+    companion object {
+        const val LOCK_KEY = "lock:audio-recommendation-snapshot-refresh"
+    }
+}

src/test/kotlin/kr/co/vividnext/sodalive/v2/audio/recommendation/adapter/out/scheduler/AudioRecommendationSnapshotSchedulerTest.kt

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+package kr.co.vividnext.sodalive.v2.audio.recommendation.adapter.out.scheduler
+
+import kr.co.vividnext.sodalive.v2.audio.recommendation.application.AudioRecommendationSnapshotRefreshService
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import org.mockito.Mockito
+import org.redisson.api.RLock
+import org.redisson.api.RedissonClient
+import org.springframework.scheduling.annotation.Scheduled
+import java.util.concurrent.TimeUnit
+
+class AudioRecommendationSnapshotSchedulerTest {
+    private val refreshService = Mockito.mock(AudioRecommendationSnapshotRefreshService::class.java)
+    private val redissonClient = Mockito.mock(RedissonClient::class.java)
+    private val lock = Mockito.mock(RLock::class.java)
+    private val scheduler = AudioRecommendationSnapshotScheduler(refreshService, redissonClient)
+
+    @Test
+    @DisplayName("스케줄러는 매일 00:00 KST cron을 사용한다")
+    fun shouldUseMidnightKstCron() {
+        val annotation = AudioRecommendationSnapshotScheduler::class.java
+            .getDeclaredMethod("refreshDailySnapshots")
+            .getAnnotation(Scheduled::class.java)
+
+        assertEquals("0 0 0 * * *", annotation.cron)
+        assertEquals("Asia/Seoul", annotation.zone)
+    }
+
+    @Test
+    @DisplayName("락 획득 성공 시에만 refresh를 호출하고 보유 중이면 unlock한다")
+    fun shouldRefreshOnlyWhenLockAcquired() {
+        Mockito.doReturn(lock).`when`(redissonClient).getLock(AudioRecommendationSnapshotScheduler.LOCK_KEY)
+        Mockito.doReturn(true).`when`(lock).tryLock(0, -1, TimeUnit.SECONDS)
+        Mockito.doReturn(true).`when`(lock).isHeldByCurrentThread
+
+        scheduler.refreshDailySnapshots()
+
+        Mockito.verify(refreshService).refreshDailySnapshots()
+        Mockito.verify(lock).unlock()
+    }
+
+    @Test
+    @DisplayName("락 획득 실패 시 refresh와 unlock을 호출하지 않는다")
+    fun shouldSkipWhenLockNotAcquired() {
+        Mockito.doReturn(lock).`when`(redissonClient).getLock(AudioRecommendationSnapshotScheduler.LOCK_KEY)
+        Mockito.doReturn(false).`when`(lock).tryLock(0, -1, TimeUnit.SECONDS)
+        Mockito.doReturn(false).`when`(lock).isHeldByCurrentThread
+
+        scheduler.refreshDailySnapshots()
+
+        Mockito.verify(refreshService, Mockito.never()).refreshDailySnapshots()
+        Mockito.verify(lock, Mockito.never()).unlock()
+    }
+}