// field.
    void setNext(@CheckForNull Waiter next) {
      ATOMIC_HELPER.putNext(this, next);
    }

    void unpark() {
      // This is racy with removeWaiter. The consequence of the race is that we may spuriously call
      // unpark even though the thread has already removed itself from the list. But even if we did

                final int httpStatusCode = response.getHttpStatusCode();
                if (httpStatusCode == 200) {
                    logger.info("ConfigSync is ready.");
                    return;
                }
                final String message = "Configsync is not available. HTTP Status is " + httpStatusCode;
                if (response.getContentException() != null) {

  // way in such a visibility issue would surface is most likely as a failure of cancel() to
  // propagate to the input. Cancellation propagation is fundamentally racy so this is fine.
  //
  // Future versions of the JMM may revise safe construction semantics in such a way that we can
  // safely publish these objects and we won't need this whole discussion.