Method ForwardUpstream

Common/ExecutionModel/vtkExecutive.cxx:567–614

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
int vtkExecutive::ForwardUpstream(vtkInformation* request)
{
  // Do not forward upstream if the input is shared with another
  // executive.
  if (this->SharedInputInformation)
  {
    return 1;
  }

  if (!this->Algorithm->ModifyRequest(request, BeforeForward))
  {
    return 0;
  }

  // Forward the request upstream through all input connections.
  int result = 1;
  for (int i = 0; i < this->GetNumberOfInputPorts(); ++i)
  {
    int nic = this->Algorithm->GetNumberOfInputConnections(i);
    vtkInformationVector* inVector = this->GetInputInformation()[i];
    for (int j = 0; j < nic; ++j)
    {
      vtkInformation* info = inVector->GetInformationObject(j);
      // Get the executive producing this input.  If there is none, then
      // it is a nullptr input.
      vtkExecutive* e;
      int producerPort;
      vtkExecutive::PRODUCER()->Get(info, e, producerPort);
      if (e)
      {
        int port = request->Get(FROM_OUTPUT_PORT());
        request->Set(FROM_OUTPUT_PORT(), producerPort);
        if (!e->ProcessRequest(request, e->GetInputInformation(), e->GetOutputInformation()))
        {
          result = 0;
        }
        request->Set(FROM_OUTPUT_PORT(), port);
      }
    }
  }

  if (!this->Algorithm->ModifyRequest(request, AfterForward))
  {
    return 0;
  }

  return result;
}

//------------------------------------------------------------------------------
void vtkExecutive::CopyDefaultInformation(vtkInformation* request, int direction,