docs: @Override
    public void resync() {
      lock.writeLock().lock();
      try {
        if (this.knownObjects == null) {
          return;
        }
  
        List<String> keys = this.knownObjects.listKeys();
        for (String key : keys) {
          syncKeyLocked(key);
        }
      } finally {
        lock.writeLock().unlock();
      }
    }