message: handle the Ctrl+C signal
diff: @@ -73,6 +73,9 @@ int initialize(int argc, char *argv[])
  ss << "grpc server port ";
  ss << port;
  Util::formatPrint(ss.str());
  + //handle the Ctrl+C signal
  + signal(SIGINT, sig_handler);
  +
  wait_group.wait();
  server.stop();
  google::protobuf::ShutdownProtobufLibrary();
  