Method UpdateData

Common/ExecutionModel/vtkDemandDrivenPipeline.cxx:374–406

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

//------------------------------------------------------------------------------
int vtkDemandDrivenPipeline::UpdateData(int outputPort)
{
  // The algorithm should not invoke anything on the executive.
  if (!this->CheckAlgorithm("UpdateData", nullptr))
  {
    return 0;
  }

  // Range check.
  if (outputPort < -1 || outputPort >= this->Algorithm->GetNumberOfOutputPorts())
  {
    vtkErrorMacro("UpdateData given output port index " << outputPort << " on an algorithm with "
                                                        << this->Algorithm->GetNumberOfOutputPorts()
                                                        << " output ports.");
    return 0;
  }

  // Setup the request for data.
  if (!this->DataRequest)
  {
    this->DataRequest = vtkInformation::New();
    this->DataRequest->Set(REQUEST_DATA());
    // The request is forwarded upstream through the pipeline.
    this->DataRequest->Set(vtkExecutive::FORWARD_DIRECTION(), vtkExecutive::RequestUpstream);
    // Algorithms process this request after it is forwarded.
    this->DataRequest->Set(vtkExecutive::ALGORITHM_AFTER_FORWARD(), 1);
  }

  // Send the request.
  this->DataRequest->Set(FROM_OUTPUT_PORT(), outputPort);
  return this->ProcessRequest(
    this->DataRequest, this->GetInputInformation(), this->GetOutputInformation());
}

//------------------------------------------------------------------------------
int vtkDemandDrivenPipeline::ExecuteDataObject(