void assertFutureTimesOut(Future<?> future) {
    assertFutureTimesOut(future, timeoutMillis());
  }

  /** Checks that future.get times out, with the given millisecond timeout. */
  void assertFutureTimesOut(Future<?> future, long timeoutMillis) {
    long startTime = System.nanoTime();
    try {
      future.get(timeoutMillis, MILLISECONDS);

    /**
     * Interrupts the thread and waits for it to terminate.
     *
     * @param timeoutMillis
     *            The time to wait (in milliseconds)
     * @return <code>true</code> if the thread has terminated
     * @throws InterruptedException
     *             If interrupted while waiting
     */
    public boolean stop(final long timeoutMillis) throws InterruptedException {
        final Thread t = this.thread;

     * @param timeoutMillis timeout before attempting to close open circuit
     */
    public SimpleCircuitBreaker(String name, int failureThreshold, int successThreshold, long timeoutMillis) {
        this.name = name;
        this.failureThreshold = failureThreshold;
        this.successThreshold = successThreshold;
        this.timeoutMillis = timeoutMillis;

        if (failureThreshold < 1) {

    private final TimeoutTarget timeoutTarget;

    private final long timeoutMillis;

    private final boolean permanent;

    private long startTime;

    private int status = ACTIVE;

    TimeoutTask(final TimeoutTarget timeoutTarget, final int timeout, final boolean permanent) {
        this.timeoutTarget = timeoutTarget;
        this.timeoutMillis = timeout * 1000L;
        this.permanent = permanent;

 * @author Justin T. Sampson
 */
@NullUnmarked
public final class TestThread<L> extends Thread implements TearDown {

  private static final long DUE_DILIGENCE_MILLIS = 100;
  private static final long TIMEOUT_MILLIS = 5000;

  private final L lockLikeObject;

  private final SynchronousQueue<Request> requestQueue = new SynchronousQueue<>();
  private final SynchronousQueue<Response> responseQueue = new SynchronousQueue<>();

 * @author Justin T. Sampson
 */
@NullUnmarked
public final class TestThread<L> extends Thread implements TearDown {

  private static final long DUE_DILIGENCE_MILLIS = 100;
  private static final long TIMEOUT_MILLIS = 5000;

  private final L lockLikeObject;

  private final SynchronousQueue<Request> requestQueue = new SynchronousQueue<>();
  private final SynchronousQueue<Response> responseQueue = new SynchronousQueue<>();