}

  final void clearSeenExceptions() {
    seenExceptionsField = null;
  }

  @VisibleForTesting
  static String atomicHelperTypeForTest() {
    return ATOMIC_HELPER.atomicHelperTypeForTest();
  }

  private abstract static class AtomicHelper {
    /** Performs an atomic compare-and-set of {@link AggregateFutureState#seenExceptionsField}. */

  // blocking. This value is what AbstractQueuedSynchronizer uses.
  private static final long SPIN_THRESHOLD_NANOS = 1000L;

  @VisibleForTesting
  static String atomicHelperTypeForTest() {
    return ATOMIC_HELPER.atomicHelperTypeForTest();
  }

  private abstract static class AtomicHelper {
    /** Non-volatile write of the thread to the {@link Waiter#thread} field. */

    Class<?> abstractFutureStateClass = classLoader.loadClass(AbstractFutureState.class.getName());
    Method helperMethod = abstractFutureStateClass.getDeclaredMethod("atomicHelperTypeForTest");
    helperMethod.setAccessible(true);
    assertThat(helperMethod.invoke(null)).isEqualTo(expectedHelperClassName);
  }

  private static ClassLoader getClassLoader(Set<String> disallowedClassNames) {

    Class<?> abstractFutureStateClass = classLoader.loadClass(AbstractFutureState.class.getName());
    Method helperMethod = abstractFutureStateClass.getDeclaredMethod("atomicHelperTypeForTest");
    helperMethod.setAccessible(true);
    assertThat(helperMethod.invoke(null)).isEqualTo(expectedHelperClassName);
  }

  private static ClassLoader getClassLoader(Set<String> disallowedClassNames) {

  public void testUsingExpectedAtomicHelper() throws Exception {
    if (isAndroid()) {
      assertThat(AbstractFutureState.atomicHelperTypeForTest()).isEqualTo("UnsafeAtomicHelper");
    } else {
      assertThat(AbstractFutureState.atomicHelperTypeForTest())
          .isEqualTo("AtomicReferenceFieldUpdaterAtomicHelper");
    }
  }

  private static boolean isJava8() {

@NullUnmarked
@GwtIncompatible
@J2ktIncompatible
public class AggregateFutureStateDefaultAtomicHelperTest extends TestCase {
  public void testUsingExpectedAtomicHelper() throws Exception {
    assertThat(AggregateFutureState.atomicHelperTypeForTest()).isEqualTo("SafeAtomicHelper");
  }

  public void testUsingExpectedAtomicHelper() throws Exception {
    if (isJava8() || isAndroid()) {
      assertThat(AbstractFutureState.atomicHelperTypeForTest()).isEqualTo("UnsafeAtomicHelper");
    } else {
      assertThat(AbstractFutureState.atomicHelperTypeForTest()).isEqualTo("VarHandleAtomicHelper");
    }
  }

  private static boolean isJava8() {
    return JAVA_SPECIFICATION_VERSION.value().equals("1.8");
  }

@NullUnmarked
@GwtIncompatible
@J2ktIncompatible
public class AggregateFutureStateDefaultAtomicHelperTest extends TestCase {
  public void testUsingExpectedAtomicHelper() throws Exception {
    assertThat(AggregateFutureState.atomicHelperTypeForTest()).isEqualTo("SafeAtomicHelper");
  }