RNtupleTreeMakerAlg.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
// Local include(s):
#include "AsgAnalysisAlgorithms/RNtupleTreeMakerAlg.h"
 
// ROOT include(s):
#include <TFile.h>
 
// Gaudi/EventLoop include(s):
#ifdef XAOD_STANDALONE
#include "EventLoop/Worker.h"
#endif
 
namespace CP {
 
   StatusCode RNtupleTreeMakerAlg::initialize() {
      if( m_branches.empty() ) {
         ATH_MSG_ERROR( "No branches set up for writing" );
         return StatusCode::FAILURE;
      }
      ATH_CHECK( m_systematicsService.retrieve() );
      m_isInitialized = false;
      return StatusCode::SUCCESS;
   }
 
   StatusCode RNtupleTreeMakerAlg::execute(const EventContext& /*ctx*/) {
      if( ! m_isInitialized ) {
         m_model = ROOT::RNTupleModel::Create();
         if ( !m_model ) {
             ATH_MSG_ERROR( "Failed to create RNTupleModel" );
             return StatusCode::FAILURE;
         }
 
         ATH_CHECK( setupTree() );
 
         TFile* outputFile = nullptr;
#ifdef XAOD_STANDALONE
         if( wk() ) {
            outputFile = wk()->getOutputFile( m_outputStreamName.value() );
         } else {
             ATH_MSG_ERROR( "Worker not available in standalone mode" );
             return StatusCode::FAILURE;
         }
#else
        // naive implementation for AthAnalysis, I don't see any Ath Svc offer getting the output stream easily
         m_outputFile.reset( TFile::Open( m_outputStreamName.value().c_str(), "UPDATE" ) );
         if (m_outputFile && m_outputFile->IsZombie()) m_outputFile.reset();
         outputFile = m_outputFile.get();
#endif
 
         if( !outputFile ) {
             ATH_MSG_ERROR( "Could not retrieve file for stream: " << m_outputStreamName.value() );
             return StatusCode::FAILURE;
         }
 
         try {
             m_writer = ROOT::RNTupleWriter::Append( std::move(m_model), m_modelName.value(), *outputFile );
         } catch( const std::exception& e ) {
             ATH_MSG_ERROR( "Failed to create RNTupleWriter: " << e.what() );
             return StatusCode::FAILURE;
         }
 
         m_isInitialized = true;
      }
 
      ATH_CHECK( m_processorList.process( *(evtStore()) ) );
 
      if ( m_writer ) {
          m_writer->Fill();
      }
 
      return StatusCode::SUCCESS;
   }
 
   StatusCode RNtupleTreeMakerAlg::finalize() {
       m_writer.reset();
#ifndef XAOD_STANDALONE
       if (m_outputFile) {
         m_outputFile->Close();
         m_outputFile.reset();
       }
#endif
       return StatusCode::SUCCESS;
   }
 
   StatusCode RNtupleTreeMakerAlg::setupTree() {
       std::unordered_set<std::string> nonContainerSet( m_nonContainers.begin(), m_nonContainers.end() );
       ATH_CHECK( m_processorList.setupTree( m_branches, std::move(nonContainerSet), *m_systematicsService, *m_model ) );
       return StatusCode::SUCCESS;
   }
 
 
 
   // Removed old ContainerProcessor/ElementProcessor implementations as they are now in FieldHelpers
} // namespace CP