code: def SaveResourceUsage(self, status):
      
      user_cpu = status.cpu_time_used.user_cpu_time
      system_cpu = status.cpu_time_used.system_cpu_time
      self.rdf_flow.cpu_time_used.user_cpu_time += user_cpu
      self.rdf_flow.cpu_time_used.system_cpu_time += system_cpu
  
      self.rdf_flow.network_bytes_sent += status.network_bytes_sent
  
      if self.rdf_flow.cpu_limit:
        user_cpu_total = self.rdf_flow.cpu_time_used.user_cpu_time
        system_cpu_total = self.rdf_flow.cpu_time_used.system_cpu_time
        if self.rdf_flow.cpu_limit < (user_cpu_total + system_cpu_total):
          # We have exceeded our limit, stop this flow.
          raise flow.FlowError("CPU limit exceeded for {} {}.".format(
              self.rdf_flow.flow_class_name, self.rdf_flow.flow_id))
  
      if (self.rdf_flow.network_bytes_limit and
          self.rdf_flow.network_bytes_limit < self.rdf_flow.network_bytes_sent):
        # We have exceeded our byte limit, stop this flow.
        raise flow.FlowError("Network bytes limit exceeded {} {}.".format(
            self.rdf_flow.flow_class_name, self.rdf_flow.flow_id))
docs: Method to tally resources.