public boolean isSet(_Fields field) {
      if (field == null) {
        throw new IllegalArgumentException();
      }

      switch (field) {
      case SUCCESS:
        return isSetSuccess();
      }
      throw new IllegalStateException();
    }
Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise
agent-module/plugins-it/thrift-it/thrift-0-14-it/src/test/java/com/navercorp/pinpoint/it/plugin/thrift/dto/EchoService.java