.build()
            .newThread(monitoredRunnable)
            .getUncaughtExceptionHandler());
  }

  public void testBuildMutateBuild() {
    ThreadFactory factory1 = builder.setPriority(1).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

    ThreadFactory factory2 = builder.setPriority(2).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

            .build()
            .newThread(monitoredRunnable)
            .getUncaughtExceptionHandler());
  }

  public void testBuildMutateBuild() {
    ThreadFactory factory1 = builder.setPriority(1).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

    ThreadFactory factory2 = builder.setPriority(2).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

    AtomicLong count = (nameFormat != null) ? new AtomicLong(0) : null;
    return new ThreadFactory() {
      @Override
      public Thread newThread(Runnable runnable) {
        Thread thread = backingThreadFactory.newThread(runnable);
        // TODO(b/139735208): Figure out what to do when the factory returns null.
        requireNonNull(thread);
        if (nameFormat != null) {

 */
public class BuildThreadFactory implements ThreadFactory {
    private final AtomicInteger id = new AtomicInteger();

    private static final String PREFIX = "BuilderThread";

    @Override
    public Thread newThread(Runnable r) {
        return new Thread(r, String.format("%s-%d", PREFIX, id.getAndIncrement()));
    }

   * Executor#execute(Runnable) execute()} method is called when this service is started and
   * stopped, and should return promptly.
   */
  protected Executor executor() {
    return command -> MoreExecutors.newThread(threadNameSupplier.get(), command).start();
  }

  @Override
  public String toString() {
    return serviceName() + " [" + state() + "]";
  }

  @Override
  public final boolean isRunning() {

    block(suppressed.toList())
  }

  @JvmStatic
  fun threadFactory(name: String): ThreadFactory {
    return object : ThreadFactory {
      private var nextId = 1

      override fun newThread(runnable: Runnable): Thread {
        return Thread(runnable, "$name-${nextId++}")
      }
    }
  }
}

fun getEnv(name: String) = System.getenv(name)

val SYSTEM_FILE_SYSTEM = FileSystem.SYSTEM

   * to the string returned by {@link #serviceName}
   */
  protected Executor executor() {
    return command -> MoreExecutors.newThread(serviceName(), command).start();
  }

  @Override
  public String toString() {
    return serviceName() + " [" + state() + "]";
  }

  @Override
  public final boolean isRunning() {