class PromiseSupport<T> implements Future<T> {

  private static final Logger LOGGER = LoggerFactory.getLogger(PromiseSupport.class);

  private static final int RUNNING = 1;
  private static final int FAILED = 2;
  private static final int COMPLETED = 3;

  private final Object lock;

  private volatile int state = RUNNING;
  private T value;
  private Exception exception;

  PromiseSupport() {
    this.lock = new Object();
  }

  void fulfill(T value) {
    this.value = value;
    this.state = COMPLETED;
    synchronized (lock) {
      lock.notifyAll();
    }
  }

  void fulfillExceptionally(Exception exception) {
    this.exception = exception;
    this.state = FAILED;
    synchronized (lock) {
      lock.notifyAll();
    }
  }

  @Override
  public boolean cancel(boolean mayInterruptIfRunning) {
    return false;
  }

  @Override
  public boolean isCancelled() {
    return false;
  }

  @Override
  public boolean isDone() {
    return state > RUNNING;
  }

  @Override
  public T get() throws InterruptedException, ExecutionException {
    synchronized (lock) {
      while (state == RUNNING) {
        lock.wait();
      }
    }
    if (state == COMPLETED) {
      return value;
    }
    throw new ExecutionException(exception);
  }

  @Override
  public T get(long timeout, TimeUnit unit) throws ExecutionException {<FILL_FUNCTION_BODY>}
}

    synchronized (lock) {
      while (state == RUNNING) {
        try {
          lock.wait(unit.toMillis(timeout));
        } catch (InterruptedException e) {
          LOGGER.warn("Interrupted!", e);
          Thread.currentThread().interrupt();
        }
      }
    }

    if (state == COMPLETED) {
      return value;
    }
    throw new ExecutionException(exception);
  
<no_super_class>