}

  /**
   * Peeks into the cache's internals to verify that its expiration queue is consistent. Verifies
   * that the next/prev links in the expiration queue are correct, and that the queue is ordered by
   * expiration time.
   */
  static void checkExpiration(Cache<?, ?> cache) {
    if (hasLocalCache(cache)) {
      checkExpiration(toLocalCache(cache));
    }
  }

  }

  /**
   * Peeks into the cache's internals to verify that its expiration queue is consistent. Verifies
   * that the next/prev links in the expiration queue are correct, and that the queue is ordered by
   * expiration time.
   */
  static void checkExpiration(Cache<?, ?> cache) {
    if (hasLocalCache(cache)) {
      checkExpiration(toLocalCache(cache));
    }
  }