Method ProcessRequest

Common/ExecutionModel/vtkDemandDrivenPipeline.cxx:133–267

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//------------------------------------------------------------------------------
vtkTypeBool vtkDemandDrivenPipeline::ProcessRequest(
  vtkInformation* request, vtkInformationVector** inInfoVec, vtkInformationVector* outInfoVec)
{
  // The algorithm should not invoke anything on the executive.
  if (!this->CheckAlgorithm("ProcessRequest", request))
  {
    return 0;
  }

  if (this->Algorithm && request->Has(REQUEST_DATA_OBJECT()))
  {
    // if we are up to date then short circuit
    if (this->PipelineMTime < this->DataObjectTime.GetMTime())
    {
      return 1;
    }
    // Update inputs first if they are out of date
    if (!this->ForwardUpstream(request))
    {
      return 0;
    }

    // Make sure our output data type is up-to-date.
    int result = 1;
    if (this->PipelineMTime > this->DataObjectTime.GetMTime())
    {
      // Request data type from the algorithm.
      vtkLogF(TRACE, "%s execute-data-object", vtkLogIdentifier(this->Algorithm));
      result = this->ExecuteDataObject(request, inInfoVec, outInfoVec);

      // Make sure the data object exists for all output ports.
      for (int i = 0; result && i < outInfoVec->GetNumberOfInformationObjects(); ++i)
      {
        vtkInformation* info = outInfoVec->GetInformationObject(i);
        if (!info->Get(vtkDataObject::DATA_OBJECT()))
        {
          result = 0;
        }
      }

      if (result)
      {
        // Data object is now up to date.
        this->DataObjectTime.Modified();
      }
    }

    return result;
  }

  if (this->Algorithm && request->Has(REQUEST_INFORMATION()))
  {
    // if we are up to date then short circuit
    if (this->PipelineMTime < this->InformationTime.GetMTime())
    {
      return 1;
    }
    // Update inputs first.