code: def dump(self, dump_file_name=None):
          
          config_dump = {}
  
          for _, _, category, _, _ in list(self.types_creations.values()):
              try:
                  objs = [jsonify_r(i) for i in getattr(self, category)]
              except (TypeError, AttributeError):  # pragma: no cover, simple protection
                  logger.warning("Dumping configuration, '%s' not present in the configuration",
                                 category)
                  continue
  
              container = getattr(self, category)
              if category == "services":
                  objs = sorted(objs,
                                key=lambda o: "%s/%s" % (o["host_name"], o["service_description"]))
              elif hasattr(container, "name_property"):
                  name_prop = container.name_property
                  objs = sorted(objs, key=lambda o, prop=name_prop: getattr(o, prop, ''))
              config_dump[category] = objs
  
          if not dump_file_name:
              dump_file_name = os.path.join(tempfile.gettempdir(),
                                            'alignak-%s-cfg-dump-%d.json'
                                            % (self.name, int(time.time())))
          try:
              logger.info('Dumping configuration to: %s', dump_file_name)
              fd = open(dump_file_name, "w")
              fd.write(json.dumps(config_dump, indent=4, separators=(',', ': '), sort_keys=True))
              fd.close()
              logger.info('Dumped')
          except (OSError, IndexError) as exp:  # pragma: no cover, should never happen...
              logger.critical("Error when dumping configuration to %s: %s", dump_file_name, str(exp))
docs: Dump configuration to a file in a JSON format
  
          :param dump_file_name: the file to dump configuration to
          :type dump_file_name: str
          :return: None