SUPPORT-9518: init executor service in postconstruct

src/main/java/ru/micord/ervu/av/service/FileUploadService.java

@@ -13,9 +13,12 @@ import java.util.Map;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
 
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
+import jakarta.annotation.PostConstruct;
+import jakarta.annotation.PreDestroy;
 import org.apache.kafka.clients.admin.NewTopic;
 import org.apache.kafka.clients.consumer.ConsumerRecord;
 import org.apache.kafka.clients.consumer.ConsumerRecords;
@@ -61,6 +64,7 @@ public class FileUploadService {
   private final FileManager fIleManager;
   private final ReceiveScanReportRetryable receiveScanReportRetryable;
   private final S3Service s3Service;
+  private ExecutorService executorService;
 
   @Autowired
   public FileUploadService(
@@ -75,23 +79,21 @@ public class FileUploadService {
     this.fIleManager = fIleManager;
   }
 
+  @PostConstruct
+  public void init() {
+    executorService = Executors.newFixedThreadPool(threadCount);
+  }
+
   @KafkaListener(id = "${spring.kafka.consumer.group.id}", topics = "${kafka.in.topic.name}",
       batch = "true", containerFactory = "inputKafkaListenerContainerFactory")
   public void listenKafkaIn(ConsumerRecords<String, String> records) {
-    ExecutorService executorService = Executors.newFixedThreadPool(threadCount);
-
-    try {
-      List<CompletableFuture<Void>> futures = new ArrayList<>();
-      records.forEach(record -> {
-        CompletableFuture<Void> future = CompletableFuture.runAsync(() -> handleRecord(record),
-            executorService);
-        futures.add(future);
-      });
-      CompletableFuture.allOf(futures.toArray(new CompletableFuture[0])).join();
-    }
-    finally {
-      executorService.shutdown();
-    }
+    List<CompletableFuture<Void>> futures = new ArrayList<>();
+    records.forEach(record -> {
+      CompletableFuture<Void> future = CompletableFuture.runAsync(() -> handleRecord(record),
+          executorService);
+      futures.add(future);
+    });
+    CompletableFuture.allOf(futures.toArray(new CompletableFuture[0])).join();
   }
 
   private void handleRecord(ConsumerRecord<String, String> record) {
@@ -243,4 +245,18 @@ public class FileUploadService {
           });
     });
   }
+
+  @PreDestroy
+  public void destroy() {
+    if (executorService != null && !executorService.isShutdown()) {
+      executorService.shutdown();
+
+      try {
+        executorService.awaitTermination(1, TimeUnit.SECONDS);
+      }
+      catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+      }
+    }
+  }
 }