RNTupleAuxDynStore.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "AthContainers/AuxTypeRegistry.h"
#include "AthContainers/tools/error.h"
#include "AthContainers/exceptions.h"
#include "AthContainersInterfaces/AuxDataOption.h"
 
#include "RNTupleAuxDynStore.h"
#include "RNTupleAuxDynReader.h"
 
#include "ROOT/RNTupleReader.hxx"
 
using namespace RootAuxDynIO;
 
RNTupleAuxDynStore::RNTupleAuxDynStore( RNTupleAuxDynReader& aux_reader,
                                        long long entry, bool standalone,
                                        std::recursive_mutex* iomtx )
   : RootAuxDynStore( aux_reader, entry, standalone, iomtx ),
     m_reader( aux_reader )
{
}
 
 
bool RNTupleAuxDynStore::readData(SG::auxid_t auxid)
{
   try {
      auto& fieldInfo = m_reader.getFieldInfo(auxid, *this);
      if( fieldInfo.status == RNTupleAuxDynReader::FieldInfo::NotFound ) return false; 
 
      // Make a 1-element vector in the underlying AuxStore for the given auxid
      SG::AuxStoreInternal::getDataInternal(auxid, 1, 1, true);
      if( fieldInfo.isPackedContainer ) {
         setOption (auxid, SG::AuxDataOption ("nbits", 32));
      }
  
      // get memory location where to write data from the branch entry
      // const_cast because Field::CaptureValue() requires void*
      [[maybe_unused]] void* data ATLAS_THREAD_SAFE = const_cast<void*>(SG::AuxStoreInternal::getIOData(auxid));
      
      // if have mutex, lock to prevent potential concurrent I/O from elsewhere
      auto io_lock = m_iomutex? std::unique_lock<std::recursive_mutex>(*m_iomutex)
         : std::unique_lock<std::recursive_mutex>();
 
      fieldInfo.view->BindRawPtr(data);
      (*fieldInfo.view)(m_entry);
 
      int  nbytes = 1;   // MN: TODO how to get this?
      if( nbytes <= 0 ) {
         throw std::string("Error reading field ") + fieldInfo.fieldName;
      }
      // read OK
      m_reader.addBytes(nbytes);
   }
   catch(const std::string& e_str) {
      ATHCONTAINERS_ERROR("RNTupleAuxDynStore::getData", e_str);
      return false;
   }
 
   SG::AuxStoreInternal::toTransient (m_ctx, auxid);
   SG::AuxTypeRegistry& r = SG::AuxTypeRegistry::instance();
   SG::auxid_t linked_auxid = r.linkedVariable (auxid);
   if (linked_auxid != SG::null_auxid) {
     return readData (linked_auxid);
   }
 
   return true;
}