public void registerCatalogUpdateCallback(@NotNull Runnable callback) {
    if (myCatalog instanceof HttpVirtualFile) {
      RemoteFileInfo info = ((HttpVirtualFile)myCatalog).getFileInfo();
      if (info != null) {
        FileDownloadingAdapter adapter = new FileDownloadingAdapter() {
          @Override
          public void fileDownloaded(@NotNull VirtualFile localFile) {
            callback.run();
          }
        };
        myDownloadingAdapters.put(callback, adapter);
        info.addDownloadingListener(adapter);
      }
    }
  }
public void registerCatalogUpdateCallback(@NotNull Runnable callback)