* ExecutorService#shutdownNow()} and returns.
   *
   * <p>For a version of this method that waits <i>indefinitely</i>, use {@link
   * ExecutorService#close}.
   *
   * @param service the {@code ExecutorService} to shut down
   * @param timeout the maximum time to wait for the {@code ExecutorService} to terminate

  }

  public void testListenInPoolThreadUsesGivenExecutor() throws Exception {
    ExecutorService executorService =
        newCachedThreadPool(new ThreadFactoryBuilder().setDaemon(true).build());
    NonListenableSettableFuture<String> abstractFuture = NonListenableSettableFuture.create();
    ExecutorSpy spy = new ExecutorSpy(executorService);
    ListenableFuture<String> listenableFuture = listenInPoolThread(abstractFuture, spy);

     * test the forwarded methods
     */
  }

  @AndroidIncompatible // Mocking ExecutorService is forbidden there. TODO(b/218700094): Don't mock.
  public void testListeningDecorator_noWrapExecuteTask() {
    ExecutorService delegate = mock(ExecutorService.class);
    ListeningExecutorService service = listeningDecorator(delegate);
    Runnable task = () -> {};
    service.execute(task);

     * test the forwarded methods
     */
  }

  @AndroidIncompatible // Mocking ExecutorService is forbidden there. TODO(b/218700094): Don't mock.
  public void testListeningDecorator_noWrapExecuteTask() {
    ExecutorService delegate = mock(ExecutorService.class);
    ListeningExecutorService service = listeningDecorator(delegate);
    Runnable task = () -> {};
    service.execute(task);

   */
  @get:Synchronized
  @set:Synchronized
  var idleCallback: Runnable? = null

  private var executorServiceOrNull: ExecutorService? = null

  @get:JvmName("executorService")
  @get:Synchronized
  val executorService: ExecutorService
    get() {
      if (executorServiceOrNull == null) {
        executorServiceOrNull =
          ThreadPoolExecutor(
            0,

  }

  public void testListenInPoolThreadUsesGivenExecutor() throws Exception {
    ExecutorService executorService =
        newCachedThreadPool(new ThreadFactoryBuilder().setDaemon(true).build());
    NonListenableSettableFuture<String> abstractFuture = NonListenableSettableFuture.create();
    ExecutorSpy spy = new ExecutorSpy(executorService);
    ListenableFuture<String> listenableFuture = listenInPoolThread(abstractFuture, spy);

            ThumbnailManager mockThumbnailManager = new ThumbnailManager() {
                private int callCount = 0;

                @Override
                public int generate(ExecutorService executorService, boolean cleanup) {
                    // Return 0 to exit the loop
                    if (callCount++ == 0) {
                        return 1;
                    }
                    return 0;

import static org.junit.jupiter.api.Assertions.fail;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.lucene.search.TotalHits.Relation;

        int count = 1;
        final ExecutorService executorService = Executors.newFixedThreadPool(options.numOfThreads);
        try {
            while (count != 0) {
                count = ComponentUtil.getThumbnailManager().generate(executorService, options.cleanup);
                totalCount += count;
            }
            executorService.shutdown();
            executorService.awaitTermination(60, TimeUnit.SECONDS);