code: def block_until_shutdown(self):
      callBigDlFunc(
          self.bigdl_type, "flServerBlockUntilShutdown", self.value
      )
  
file_path: BigDL/python/ppml/src/bigdl/ppml/fl/fl_server.py
imports: from bigdl.ppml.fl import *
label_desc: Use image node_id 7 for calling the FLServer obj's underlying member method code with example usage: obj.block_until_shutdown() without return types