docs: private ExecutionCallback<Boolean> loadingFinishedCallback() {
          return new ExecutionCallback<Boolean>() {
              @Override
              public void onResponse(Boolean loadingFinished) {
                  if (loadingFinished) {
                      updateLocalKeyLoadStatus(null);
                  }
              }
  
              @Override
              public void onFailure(Throwable t) {
                  updateLocalKeyLoadStatus(t);
              }
          };
      }