code: def inspect(self, inspect_logic):
          
          op = Operator(
              _generate_uuid(),
              OpType.Inspect,
              "Inspect",
              inspect_logic,
              num_instances=self.env.config.parallelism)
          return self.__register(op)
docs: Inspects the content of the stream.
  
          Attributes:
               inspect_logic (function): The user-defined inspect function.