feat: 멀티스레드 종료 시 자원 반납 대기 시간 추가

server/src/main/java/haengdong/event/config/S3Config.java

@@ -3,6 +3,7 @@
 import jakarta.annotation.PreDestroy;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import software.amazon.awssdk.regions.Region;
@@ -12,6 +13,7 @@
 public class S3Config {
 
     private static final int THREAD_POOL_SIZE = 10;
+    private static final int LIFE_CYCLE_SHUTDOWN_TIME_SEC = 10;
 
     private final ExecutorService executorService = Executors.newFixedThreadPool(THREAD_POOL_SIZE);
 
@@ -30,5 +32,13 @@ public ExecutorService executorService() {
     @PreDestroy
     public void shutdown() {
         executorService.shutdown();
+        try {
+            if (!executorService.awaitTermination(LIFE_CYCLE_SHUTDOWN_TIME_SEC, TimeUnit.SECONDS)) {
+                executorService.shutdownNow();
+            }
+        } catch (InterruptedException e) {
+            executorService.shutdownNow();
+            Thread.currentThread().interrupt();
+        }
     }
 }