docs: @Override
    public void close() {
      synchronized (cacheManagers) {
        for (Map.Entry<ClassLoader, ConcurrentMap<URI, Eh107CacheManager>> entry : cacheManagers.entrySet()) {
          for (Eh107CacheManager cacheManager : entry.getValue().values()) {
            cacheManager.close();
          }
        }
        cacheManagers.clear();
      }
    }