if (cache instanceof LocalLoadingCache) {
      return ((LocalLoadingCache<K, V>) cache).localCache;
    }
    throw new IllegalArgumentException(
        "Cache of type " + cache.getClass() + " doesn't have a LocalCache.");
  }

  /**
   * Determines whether the given cache can be converted to a LocalCache by {@link #toLocalCache}
   * without throwing an exception.
   */

    if (cache instanceof LocalLoadingCache) {
      return ((LocalLoadingCache<K, V>) cache).localCache;
    }
    throw new IllegalArgumentException(
        "Cache of type " + cache.getClass() + " doesn't have a LocalCache.");
  }

  /**
   * Determines whether the given cache can be converted to a LocalCache by {@link #toLocalCache}
   * without throwing an exception.
   */