Method RequestData

IO/ParallelXML/vtkXMLPartitionedDataSetWriter.cxx:44–139

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//----------------------------------------------------------------------------
int vtkXMLPartitionedDataSetWriter::RequestData(
  vtkInformation*, vtkInformationVector** inputVector, vtkInformationVector*)
{
  vtkLogScopeF(TRACE, "RequestData ('%s')", this->FileName);
  this->SetErrorCode(vtkErrorCode::UnknownError);

  if (this->WriteToOutputString)
  {
    vtkErrorMacro("This writer does not support writing to string yet.");
    return 0;
  }

  if (!this->FileName || this->FileName[0] == '\0')
  {
    this->SetErrorCode(vtkErrorCode::NoFileNameError);
    vtkErrorMacro("Filename cannot be empty!");
    return 0;
  }

  auto controller = this->GetController();

  auto inputPDS = vtkPartitionedDataSet::GetData(inputVector[0], 0);
  assert(inputPDS != nullptr);

  this->UpdateProgress(0.0);

  std::string path, filename, artifactsDir;
  std::tie(path, filename, artifactsDir) = vtkXMLWriter2::SplitFileName(this->FileName);
  vtkLogF(TRACE, "Filename components(path='%s', filename='%s', artifactsDir='%s')", path.c_str(),
    filename.c_str(), artifactsDir.c_str());
  if (!this->MakeDirectory(path))
  {
    this->SetErrorCode(vtkErrorCode::OutOfDiskSpaceError);
    vtkErrorMacro("Failed to create directory '" << path << "'.");
    return 0;
  }

  // we intentionally don't add path as an artifact to cleanup if write fails.
  // this->AddArtifact(path, true);

  const auto absoluteArtifactsDir = path + "/" + artifactsDir;
  if (!this->MakeDirectory(absoluteArtifactsDir))
  {
    this->SetErrorCode(vtkErrorCode::OutOfDiskSpaceError);
    vtkErrorMacro("Failed to create directory '" << absoluteArtifactsDir << "'.");
    return 0;
  }
  this->AddRootArtifact(absoluteArtifactsDir, /*isDir*/ true);

  // note: localDataSets may have nullptrs.
  auto localDataSets =
    vtkCompositeDataSet::GetDataSets<vtkDataObject>(inputPDS, /*preserveNull=*/true);
  const int localOffset =
    vtkXMLWriter2::ExclusiveScanSum(controller, static_cast<int>(localDataSets.size()));

  // note: localFilenames may have empty strings.
  std::vector<std::string> localFilenames;