private val network: Network? = null,
) : AsyncDns {
  @RequiresApi(Build.VERSION_CODES.Q)
  internal val resolver = DnsResolver.getInstance()
  private val executor = Executors.newSingleThreadExecutor()

  override fun query(
    hostname: String,
    callback: AsyncDns.Callback,
  ) {
    try {
      resolver.query(
        network,
        hostname,
        dnsClass.type,

  }

  private class FakeService extends AbstractExecutionThreadService implements TearDown {

    private final ExecutorService executor = Executors.newSingleThreadExecutor();

    FakeService() {
      tearDownStack.addTearDown(this);
    }

    volatile int startupCalled = 0;
    volatile int shutdownCalled = 0;
    volatile int runCalled = 0;

  private val outFrames: MutableList<OutFrame> = ArrayList()
  private val inFrames: BlockingQueue<InFrame> = LinkedBlockingQueue()
  private var port = 0
  private val executor = Executors.newSingleThreadExecutor(threadFactory("MockHttp2Peer"))
  private var serverSocket: ServerSocket? = null
  private var socket: Socket? = null

  fun setClient(client: Boolean) {
    if (this.client == client) return

    class MyError extends Error {}
    final CyclicBarrier barrier = new CyclicBarrier(2);
    // we need to make sure the error gets thrown on a different thread.
    ExecutorService service = Executors.newSingleThreadExecutor();
    try {
      final SequentialExecutor executor = new SequentialExecutor(service);
      Runnable errorTask =
          new Runnable() {
            @Override
            public void run() {

  }

  private class FakeService extends AbstractExecutionThreadService implements TearDown {

    private final ExecutorService executor = Executors.newSingleThreadExecutor();

    FakeService() {
      tearDownStack.addTearDown(this);
    }

    volatile int startupCalled = 0;
    volatile int shutdownCalled = 0;
    volatile int runCalled = 0;

    class MyError extends Error {}
    final CyclicBarrier barrier = new CyclicBarrier(2);
    // we need to make sure the error gets thrown on a different thread.
    ExecutorService service = Executors.newSingleThreadExecutor();
    try {
      final SequentialExecutor executor = new SequentialExecutor(service);
      Runnable errorTask =
          new Runnable() {
            @Override
            public void run() {

  private static final long HALF_SECOND_NANOS = NANOSECONDS.convert(1L, SECONDS) / 2;

  public void testShutdownAndAwaitTermination_immediateShutdown() throws Exception {
    ExecutorService service = Executors.newSingleThreadExecutor();
    assertTrue(shutdownAndAwaitTermination(service, 1L, SECONDS));
    assertTrue(service.isTerminated());
  }

        Path dirToDelete = fs.getPath("dir/b/i");
        Path changingFile = dirToDelete.resolve("j/l");
        Path symlinkTarget = fs.getPath("/dontdelete");

        ExecutorService executor = Executors.newSingleThreadExecutor();
        startDirectorySymlinkSwitching(changingFile, symlinkTarget, executor);

        try {
          for (int i = 0; i < iterations; i++) {
            try {

        Path dirToDelete = fs.getPath("dir/b/i");
        Path changingFile = dirToDelete.resolve("j/l");
        Path symlinkTarget = fs.getPath("/dontdelete");

        ExecutorService executor = Executors.newSingleThreadExecutor();
        startDirectorySymlinkSwitching(changingFile, symlinkTarget, executor);

        try {
          for (int i = 0; i < iterations; i++) {
            try {

  private static final long HALF_SECOND_NANOS = NANOSECONDS.convert(1L, SECONDS) / 2;

  public void testShutdownAndAwaitTermination_immediateShutdown() throws Exception {
    ExecutorService service = Executors.newSingleThreadExecutor();
    assertTrue(shutdownAndAwaitTermination(service, 1L, SECONDS));
    assertTrue(service.isTerminated());
  }