TriggerEDMSerialiserTool.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#include "TriggerEDMSerialiserTool.h"
#include "TriggerEDMCLIDs.h"
 
#include "Gaudi/Interfaces/IOptionsSvc.h"
#include "GaudiKernel/System.h"
#include "AthenaKernel/BaseInfo.h"
#include "AthenaKernel/StorableConversions.h"
#include "AthContainersInterfaces/IAuxStoreIO.h"
#include "AthContainers/AuxTypeRegistry.h"
#include "AthContainers/tools/copyAuxStoreThinned.h"
#include "AthContainers/debug.h"
#include "CxxUtils/StringUtilsTemplates.h"
#include "TrigSerializeResult/StringSerializer.h"
#include "TrigCompositeUtils/HLTIdentifier.h"
#include "xAODCore/AuxContainerBase.h"
#include "xAODTrigger/TrigCompositeAuxContainer.h"
 
#include <ranges>
#include <string>
#include <numeric>
 
namespace {
  // Special module ID used internally to store total result size limit in the truncation threshold map
  constexpr uint16_t fullResultTruncationID = std::numeric_limits<uint16_t>::max();
}
 
TriggerEDMSerialiserTool::TriggerEDMSerialiserTool( const std::string& type,
                            const std::string& name,
                            const IInterface* parent )
  : base_class( type, name, parent ),
    m_dynAuxAddress(AuxIdTypeMap_t::Updater_t()) {}
 
StatusCode TriggerEDMSerialiserTool::initialize() {
  // Initialise tools and services
  ATH_CHECK( m_serializerSvc.retrieve() );
  ATH_CHECK( m_clidSvc.retrieve() );
  ATH_CHECK( m_debugInfoWHKey.initialize() );
  ATH_CHECK( m_debugNavigationSummaryRHKey.initialize() );
  if (!m_monTool.empty()) ATH_CHECK(m_monTool.retrieve());
  // Parse the list of collections to serialise
  for ( const std::string& typeKeyAuxIDs : m_collectionsToSerialize.value() ) {
    ATH_CHECK(addCollectionToSerialise(typeKeyAuxIDs, m_toSerialise));
  }
 
  // Retrieve the total result size limit from DataFlowConfig which is a special object
  // used online to hold DF properties passed from TDAQ to HLT as run parameters
  auto jobOptionsSvc = service<Gaudi::Interfaces::IOptionsSvc>("JobOptionsSvc", /*createIf=*/ false);
  if (!jobOptionsSvc.isValid()) {
    ATH_MSG_WARNING("Could not retrieve JobOptionsSvc, will not update the EventSizeHardLimitMB property");
  }
  else {
    if (jobOptionsSvc->has("DataFlowConfig.DF_MaxEventSizeMB")) {
      if (m_eventSizeHardLimitMB.fromString(jobOptionsSvc->get("DataFlowConfig.DF_MaxEventSizeMB")).isSuccess()) {
        ATH_MSG_DEBUG("Updated EventSizeHardLimitMB to " << m_eventSizeHardLimitMB.value()
                      << " from DataFlowConfig.DF_MaxEventSizeMB");
      }
      else {
        ATH_MSG_ERROR("Could not convert DataFlowConfig.DF_MaxEventSizeMB to integer. Leaving EventSizeHardLimitMB="
                      << m_eventSizeHardLimitMB.value());
      }
    }
    else {
      ATH_MSG_DEBUG("Could not retrieve DataFlowConfig.DF_MaxEventSizeMB from JobOptionsSvc. This is fine if running "
                    << "offline, but should not happen online. Leaving EventSizeHardLimitMB="
                    << m_eventSizeHardLimitMB.value());
    }
  }
 
  // Add the total result size limit to truncation threshold map
  if (m_eventSizeHardLimitMB >= 0) {
    if (m_fullResultTruncationFrac > 1.0) {
      ATH_MSG_ERROR("Fraction cannot be > 1.0, but FullResultTruncationFrac is set to " << m_fullResultTruncationFrac);
      return StatusCode::FAILURE;
    }
    float totalResultSizeLimitBytes = m_fullResultTruncationFrac * m_eventSizeHardLimitMB * 1024. * 1024.;
    m_truncationThresholds[fullResultTruncationID] = static_cast<uint32_t>(totalResultSizeLimitBytes);
  }
  else {
    m_truncationThresholds[fullResultTruncationID] = std::numeric_limits<uint32_t>::max();
  }
 
  return StatusCode::SUCCESS;
}
 
StatusCode TriggerEDMSerialiserTool::addCollectionToSerialise(const std::string& typeKeyAuxIDs, std::vector<Address>& addressVec) const {
  ATH_MSG_DEBUG("Parsing " << typeKeyAuxIDs);
 
  // Syntax: 'collectionKeyType;module1,module2,...[;allowTruncation]'
  std::vector<std::string_view> def = CxxUtils::tokenize<std::string_view, char>(typeKeyAuxIDs, ';');
 
  if ( def.size() < 2 ) {
    ATH_MSG_ERROR("Invalid EDM collection specification: " << typeKeyAuxIDs);
    return StatusCode::FAILURE;
  }
 
  const std::string_view typeKeyAux = def[0];
  const std::string_view configuredType = typeKeyAux.substr( 0, typeKeyAux.find('#') );
  const std::string_view key = typeKeyAux.substr( typeKeyAux.find('#')+1, typeKeyAux.find('.')-typeKeyAux.find('#') );
 
  Address::Truncation truncationMode{Address::Truncation::Error};
 
  const size_t pos = configuredType.find('_');
  const std::string transientType{ pos==std::string::npos ? configuredType : configuredType.substr(0, pos) };
 
  CLID clid{0};
  std::string persistentType;
  if ( m_clidSvc->getIDOfTypeName(transientType, clid).isFailure() )  {
    ATH_MSG_ERROR( "Can not find CLID for " << transientType << " that is needed for serialisation " << key );
    return StatusCode::FAILURE;
  }
  ATH_MSG_VERBOSE("Decoded transient type: " << transientType << " with the CLID " << clid );
 
  if ( transientType == configuredType ) {
    std::string realTypeName;
    if( m_clidSvc->getTypeInfoNameOfID( clid, realTypeName ).isFailure() ) {
      ATH_MSG_ERROR( "Can not find real type name for " << transientType << " that is needed for serialisation " << key );
      return StatusCode::FAILURE;
    }
    persistentType = transientType + version( realTypeName );
    ATH_MSG_VERBOSE(transientType << " = "<< configuredType << " thus obtained real type name from clid svc " << realTypeName << " forming persistent type name "<< persistentType );
  } else {
    persistentType = configuredType;
  }
 
  ATH_MSG_DEBUG( "Persistent type: " << persistentType );
 
  RootType classDesc = RootType::ByNameNoQuiet( persistentType );
  if ( ! classDesc.IsComplete() ) {
    ATH_MSG_ERROR( "The type " << persistentType <<  " is not known to ROOT serialiser" );
    return StatusCode::FAILURE;
  }
 
  // Set truncation mode
  if ( def.size() > 2 && def[2].contains("allowTruncation") ) {
    ATH_MSG_DEBUG("Truncation allowed for " << configuredType << "#" << key);
    truncationMode = Address::Truncation::Allowed;
  }
 
  std::vector<uint16_t> moduleIdVec = CxxUtils::tokenize<uint16_t, char>(def[1], ',');
  std::sort(moduleIdVec.begin(), moduleIdVec.end());
 
  if (moduleIdVec.empty()) {
    ATH_MSG_ERROR( "No HLT result module IDs given for " << typeKeyAux );
    return StatusCode::FAILURE;
  }
 
  ATH_MSG_DEBUG( "Transient type " << transientType << " persistent type " << persistentType << " will be written to " << moduleIdVec.size() << " result ROBFragments with IDs: "
      << moduleIdVec << "" );
 
  if ( persistentType.starts_with("xAOD") ) { // xAOD - either interface of Aux
    xAOD::AuxSelection sel;
    if ( typeKeyAux.contains('.') ) { // Aux, possibly with selection of variables
      ATH_MSG_DEBUG( "with aux content: "  );
      const std::string allVars = std::string(typeKeyAux.substr( typeKeyAux.find('.')+1 ));
      if (!allVars.empty()) {
        const auto variableNames = allVars | std::views::split('.') | std::ranges::to<std::set<std::string>>();
        if (msgLvl(MSG::DEBUG)) {
          for ( const auto& el: variableNames ) {
            ATH_MSG_DEBUG( " \"" << el << "\""  );
          }
        }
        sel.selectAux( variableNames );
      }
      addressVec.push_back( {transientType, std::move(persistentType), std::move(classDesc), clid, 
       std::string(key), std::move(moduleIdVec), Address::Category::xAODAux, truncationMode, std::move(sel)} );
    } else {
      addressVec.push_back( {transientType, std::move(persistentType), std::move(classDesc), clid, 
       std::string(key), std::move(moduleIdVec), Address::Category::xAODInterface, truncationMode} );
    }
  } else { // an old T/P type
    addressVec.push_back( {transientType, std::move(persistentType), std::move(classDesc), clid, 
     std::string(key), std::move(moduleIdVec), Address::Category::OldTP, truncationMode} );
  }
  return StatusCode::SUCCESS;
}
 
StatusCode TriggerEDMSerialiserTool::makeHeader(const Address& address, std::vector<uint32_t>& buffer  ) {
  buffer.push_back(0); // fragment size placeholder
  buffer.push_back( address.clid ); // type info via CLID
 
  std::vector<uint32_t> serializedLabel;
  StringSerializer ss;
  std::vector<std::string> descr({address.persType, address.key});
  ss.serialize( descr, serializedLabel );
  buffer.push_back( serializedLabel.size() );
  buffer.insert( buffer.end(), serializedLabel.begin(), serializedLabel.end() ); // plain SG key
  return StatusCode::SUCCESS;
}
 
StatusCode TriggerEDMSerialiserTool::fillPayload( const void* data, size_t sz, std::vector<uint32_t>& buffer ) const {
  ATH_CHECK( sz != 0 );
  ATH_CHECK( data != nullptr );
 
  buffer.push_back( sz ); // size in bytes
  const size_t neededSize = std::ceil( double(sz)/sizeof(uint32_t) );
  const size_t existingSize = buffer.size();
  buffer.resize(existingSize + neededSize);
  std::memcpy(buffer.data() + existingSize, data, sz);
  return StatusCode::SUCCESS;
}
 
 
 
StatusCode TriggerEDMSerialiserTool::serialiseDynAux( DataObject* dObj, const Address& address, std::vector<uint32_t>& buffer, size_t& nDynWritten ) const {
  ATH_MSG_DEBUG( "About to start streaming aux data of " << address.key );
  DataBucketBase* dObjAux = dynamic_cast<DataBucketBase*>(dObj);
  ATH_CHECK( dObjAux != nullptr );
  //coverity[FORWARD_NULL:FALSE]
  const SG::IAuxStoreIO* auxStoreIO = dObjAux->template cast<SG::IAuxStoreIO> (nullptr, true);
  if ( auxStoreIO == nullptr ) {
    ATH_MSG_DEBUG( "Can't obtain AuxContainerBase of " << address.key <<  " no dynamic variables presumably" );
    return StatusCode::SUCCESS;
  }
 
  const SG::auxid_set_t& selected = address.sel.getSelectedAuxIDs( auxStoreIO->getDynamicAuxIDs() );
 
  if ( selected.empty() ) {
    ATH_MSG_VERBOSE( "Empty set of dynamic variables to store, do nothing" );
    return StatusCode::SUCCESS;
  }
  ATH_MSG_DEBUG("Ready for serialisation of " << selected.size() << " dynamic variables");
 
  for (SG::auxid_t auxVarID : selected ) {
 
    const Address* auxAddress{};
 
    // Find type information for dynamic variable
    const auto itr = m_dynAuxAddress.find(auxVarID);
    if ( itr != m_dynAuxAddress.end() ) {
      auxAddress = &(itr->second);
    }
    // Or create and cache it on first encounter. We cannot do this during addCollectionToSerialise
    // because variables with AuxDataOptions set (e.g. PackedContainer) don't report their actual
    // type through the AuxTypeRegistry (see ATR-32953).
    else {
      const std::string decorationName = SG::AuxTypeRegistry::instance().getName(auxVarID);
      const std::string typeName = SG::AuxTypeRegistry::instance().getVecTypeName(auxVarID);
      const std::type_info* tinfo = auxStoreIO->getIOType (auxVarID);
 
      ATH_CHECK( tinfo != nullptr );
      TClass* cls = TClass::GetClass (*tinfo);
      ATH_CHECK( cls != nullptr );
 
      CLID clid{0};
      if ( m_clidSvc->getIDOfTypeName(typeName, clid).isFailure() ) { // First try
        const std::string fullTypeName = System::typeinfoName( *tinfo );
        if ( m_clidSvc->getIDOfTypeInfoName(fullTypeName, clid).isFailure() ) { // Second try
          ATH_MSG_ERROR("Unable to obtain CLID for either typeName:" << typeName << " or fullTypeName:" << fullTypeName);
          ATH_MSG_ERROR("Please check if this is something which should obtain a CLID via TriggerEDMCLIDs.h");
          return StatusCode::FAILURE;
        }
      }
 
      // Create the type information for the dynamic variable
      Address addr { typeName, cls->GetName(), RootType(cls), clid,
                     decorationName, address.moduleIdVec, Address::Category::xAODDecoration };
 
      // Store type and get pointer to it
      const auto& [itr, inserted] = m_dynAuxAddress.emplace( auxVarID, std::move(addr) );
      auxAddress = &(itr->second);
    }
 
    ATH_MSG_DEBUG( "Streaming '" << auxAddress->key << "' of type '" << auxAddress->transType <<
                   "', aux ID " << auxVarID << ", class '" << auxAddress->classDesc.Class()->GetName() <<
                   "'" << ", CLID " << auxAddress->clid );
 
    const void* rawptr = auxStoreIO->getIOData( auxVarID );
    ATH_CHECK( rawptr != nullptr );
 
    size_t sz=0;
    void* mem = m_serializerSvc->serialize( rawptr, auxAddress->classDesc, sz );
 
    if ( mem == nullptr or sz == 0 ) {
      ATH_MSG_ERROR( "Serialisation of " << address.persTypeName() << "."<< auxAddress->key << " unsuccessful" );
      return StatusCode::FAILURE;
    }
    ATH_MSG_DEBUG( "Serialised " << address.persTypeName() << "."<< auxAddress->key  << " memory size " << sz );
 
    std::vector<uint32_t> fragment;
    ATH_CHECK( makeHeader( *auxAddress, fragment ) );
    ATH_CHECK( fillPayload( mem, sz, fragment ) );
    fragment[0] = fragment.size();
 
    delete [] static_cast<const char*>( mem );
 
    buffer.insert( buffer.end(), fragment.begin(), fragment.end() );
    ++nDynWritten;
  }
  return StatusCode::SUCCESS;
}
 
 
StatusCode TriggerEDMSerialiserTool::serialiseContainer( void* data, const Address& address, std::vector<uint32_t>& buffer ) const {
 
  size_t sz=0;
  void* mem = m_serializerSvc->serialize( data, address.classDesc, sz );
 
  ATH_MSG_DEBUG( "Streamed to buffer at address " << mem << " of " << sz << " bytes" );
 
  if ( mem == nullptr or sz == 0 ) {
    ATH_MSG_ERROR( "Serialisation of " << address.persType << " " << address.key << " unsuccessful" );
    return StatusCode::FAILURE;
  }
 
  // prepare fragment
  std::vector<uint32_t> fragment;
  ATH_CHECK( makeHeader( address, fragment ) );
  ATH_CHECK( fillPayload( mem, sz, fragment ) );
  if ( mem != nullptr ) delete [] static_cast<const char*>( mem );
 
 
  ATH_MSG_DEBUG( address.transType << "#" << address.key << " Fragment size: " << fragment.size()*sizeof(uint32_t) << " bytes");
  fragment[0] = fragment.size();
  buffer.insert( buffer.end(), fragment.begin(), fragment.end() );
 
  return StatusCode::SUCCESS;
}
 
StatusCode TriggerEDMSerialiserTool::serialisexAODAuxContainer(
  void* data,
  const Address& address,
  std::vector<uint32_t>& buffer,
  SGImplSvc* evtStore) const
{
  ATH_MSG_DEBUG("xAOD Aux Container");
 
  void* copy = data;
  //Get the Base Info given clid.
  const SG::BaseInfoBase* bib = SG::BaseInfoBase::find (address.clid);
  //cast data to xAOD::AuxContainerBase
  void* data_interface = bib->cast (data, ClassID_traits<xAOD::AuxContainerBase>::ID());
  if (data_interface != nullptr) {
    const xAOD::AuxContainerBase* store = reinterpret_cast<const xAOD::AuxContainerBase*> (data_interface);
    copy = address.classDesc.Construct();
    //cast copy to xAOD::AuxContainerBase
    void* copy_interface = bib->cast (copy, ClassID_traits<xAOD::AuxContainerBase>::ID());
    xAOD::AuxContainerBase* copy_store = reinterpret_cast<xAOD::AuxContainerBase*> (copy_interface);
    SG::copyAuxStoreThinned (*store,
                             *copy_store,
                             nullptr);
  }
 
  ATH_CHECK( serialiseContainer( copy, address, buffer ) );
 
  if (copy != data) {
    address.classDesc.Destruct (copy);
  }
 
  size_t baseSize = buffer.size();
  if ( not m_saveDynamic )
    return StatusCode::SUCCESS;
 
  DataObject* dObj = evtStore->accessData( address.clid, address.key );
  ATH_CHECK( dObj != nullptr );
  size_t nDynWritten = 0;
  ATH_CHECK( serialiseDynAux( dObj, address, buffer, nDynWritten ) );
  if ( nDynWritten > 0 ) {
    ATH_MSG_DEBUG( "   Fragment size including " <<  (buffer.size() - baseSize)*sizeof(uint32_t)  << " bytes from "
           << nDynWritten << "x DynAux : " << buffer.size()*sizeof(uint32_t) );
  }
  return StatusCode::SUCCESS;
}
 
StatusCode TriggerEDMSerialiserTool::serialiseTPContainer( void* data, const Address& address, std::vector<uint32_t>& buffer ) const {
 
  ATH_MSG_DEBUG("TP Container, converting from: " <<  address.transType << " to " << address.persType  );
  std::string converterPersistentType;
  void * persistent = m_tpTool->convertTP( address.transType,  data, converterPersistentType );
  ATH_CHECK( persistent != nullptr );
  ATH_CHECK ( converterPersistentType == address.persType );
  ATH_CHECK( serialiseContainer( persistent, address, buffer ) );
 
  address.classDesc.Destruct( persistent );
 
  return StatusCode::SUCCESS;
}
 
StatusCode TriggerEDMSerialiserTool::serialise( const Address& address, std::vector<uint32_t>& buffer, SGImplSvc* evtStore ) const {
  DataObject* dObj = evtStore->accessData( address.clid, address.key );
  if ( dObj == nullptr ) {
    ATH_MSG_DEBUG("Data Object with the CLID " << address.clid << " and the key " << address.key << " is missing");
    return StatusCode::SUCCESS;
  }
 
  void* rawptr = SG::fromStorable( dObj, address.clid, nullptr, msgLvl(MSG::DEBUG) );
  if ( rawptr == nullptr ) {
    ATH_MSG_DEBUG( "Data Object with key " << address.key << " can not be converted to void* for streaming" );
    return StatusCode::SUCCESS;
  }
  ATH_MSG_DEBUG("Obtained raw pointer " << rawptr );
 
  if ( address.category == Address::Category::xAODInterface ) {
    return serialiseContainer( rawptr, address, buffer );
  }
  if ( address.category == Address::Category::xAODAux ) {
    return serialisexAODAuxContainer( rawptr, address, buffer, evtStore );
  } 
  if ( address.category == Address::Category::OldTP ) {
    return serialiseTPContainer( rawptr, address, buffer );
  } 
  ATH_MSG_ERROR("Unknown Address category - neither of xAODInterface, xAODAux, OldTP");
  return StatusCode::FAILURE;
}
 
StatusCode TriggerEDMSerialiserTool::fill( HLT::HLTResultMT& resultToFill, const EventContext& ctx ) const {
 
  // Leave this check until there is a justified case for appending data to an existing result
  if (not resultToFill.getSerialisedData().empty()) {
    ATH_MSG_ERROR("Trying to fill a result which is not empty! Likely misconfiguration, returning a FAILURE");
    return StatusCode::FAILURE;
  }
 
  SGImplSvc* evtStore = dynamic_cast<SGImplSvc*>(Atlas::getExtendedEventContext(ctx).proxy());
  ATH_CHECK( evtStore != nullptr );
 
  // Map storing information to be written out in case of truncation for each module
  TruncationInfoMap truncationInfoMap;
 
  // Record debug info container to be filled in case of truncation
  auto debugInfo = SG::makeHandle(m_debugInfoWHKey, ctx);
  auto debugInfoData = std::make_unique<xAOD::TrigCompositeContainer>();
  auto debugInfoAux  = std::make_unique<xAOD::TrigCompositeAuxContainer>();
  debugInfoData->setStore(debugInfoAux.get());
  ATH_CHECK(debugInfo.record(std::move(debugInfoData), std::move(debugInfoAux)));
 
  // Find a list of active moduleIDs in this event to skip inactive ones
  std::set<uint16_t> activeModules = activeModuleIDs(resultToFill);
  if (activeModules.empty()) {
    ATH_MSG_DEBUG("No active module IDs in this event. This is normal for events accepted "
                  << "only to calibration streams. Skip all EDM serialisation.");
    return StatusCode::SUCCESS;
  }
 
  // Create buffer for serialised data
  std::vector<uint32_t> buffer;
  buffer.reserve(1000);
 
  std::unordered_map<uint16_t, std::vector<uint32_t>> deferredInterfaceBuffer;
  for ( const Address& address: m_toSerialise ) {
    // Check if we need to serialise this object for this event
    std::vector<uint16_t> addressActiveModuleIds;
    std::set_intersection(address.moduleIdVec.begin(), address.moduleIdVec.end(),
                          activeModules.begin(), activeModules.end(),
                          std::back_inserter(addressActiveModuleIds));
    if (addressActiveModuleIds.empty()) {
      ATH_MSG_DEBUG("Streaming of " << address.persTypeName() << " is skipped "
                    << "because its module IDs are not active in this event");
      continue;
    }
 
    buffer.clear();
    ATH_MSG_DEBUG( "Streaming " << address.persTypeName() );
    //coverity[FORWARD_NULL:FALSE]
    ATH_CHECK( serialise(address, buffer, evtStore) );
    if (buffer.empty()) {
      ATH_MSG_DEBUG("Streaming of " << address.persTypeName() << " is skipped");
      continue;
    }
   
    const size_t thisFragmentSize = buffer.size()*sizeof(uint32_t);
    ATH_MSG_DEBUG( "Serialised size of " << address.persTypeName() << " is " << thisFragmentSize << " bytes" );
    for (const uint16_t id : addressActiveModuleIds) {
      // If result not yet truncated, try adding the serialised data
      if (resultToFill.getTruncatedModuleIds().count(id)==0) {
        // for truncation allowed collections, save the interface for a deferred addition
        if (address.truncationMode==Address::Truncation::Allowed &&
           address.category == Address::Category::xAODInterface){
            deferredInterfaceBuffer[id]=buffer;
            continue;
        } 
        else {
          ATH_CHECK(tryAddData(resultToFill, id, buffer, address.truncationMode, deferredInterfaceBuffer));
          // clean up the deferred interface buffer, if used          
           deferredInterfaceBuffer.erase(id);
        }
      }
      // Check for truncation after adding data
      if (resultToFill.getTruncatedModuleIds().count(id)==0) {
        ATH_MSG_DEBUG("Module " << id << " payload after inserting " << address.persTypeName() << " has "
                      << resultToFill.getSerialisedData().at(id).size()*sizeof(uint32_t) << " bytes");
        truncationInfoMap[id].push_back({&address, thisFragmentSize, true});
      }
      else {
        ATH_MSG_WARNING("HLTResult with module ID " << id <<
                        " truncated - could not add " << address.persTypeName() <<
                        (address.truncationMode==Address::Truncation::Allowed ? " (truncation allowed)" : ""));
        truncationInfoMap[id].push_back({&address, thisFragmentSize, false});
      }
    }
  }
 
  // Handle truncation
  ATH_CHECK(fillDebugInfo(truncationInfoMap, *debugInfo, resultToFill, evtStore));
 
  return StatusCode::SUCCESS;
}
 
StatusCode TriggerEDMSerialiserTool::tryAddData(HLT::HLTResultMT& hltResult,
                                                const uint16_t id,
                                                const std::vector<uint32_t>& data,
                                                Address::Truncation truncationMode, 
                                                const std::unordered_map<uint16_t, std::vector<uint32_t>> & deferredInterfaceBuffer) const {
  if (m_truncationThresholds.value().count(id)==0) {
    ATH_MSG_ERROR("Module ID " << id << " missing from TruncationThresholds map. Cannot determine if result needs truncation");
    return StatusCode::FAILURE;
  }
 
  // Size in this module
  const uint32_t currentSizeBytes = hltResult.getSerialisedData().count(id)==0
                                    ? 0 : hltResult.getSerialisedData().at(id).size()*sizeof(uint32_t);
  // Total size
  size_t currentTotalSizeWords = 0;
  for (const auto& [i, d] : hltResult.getSerialisedData()) currentTotalSizeWords += d.size();
  const uint32_t currentTotalSizeBytes = currentTotalSizeWords*sizeof(uint32_t);
  // Size to be added
  const uint32_t extraSizeBytes = data.size()*sizeof(uint32_t);
 
  bool severeTruncation = truncationMode==Address::Truncation::Error;
  if (currentTotalSizeBytes+extraSizeBytes > m_truncationThresholds.value().at(fullResultTruncationID)) {
    // The data doesn't fit, flag the full result as truncated
    ATH_MSG_DEBUG("Skipping adding data to result with module ID " << id << " because of full-result truncation");
    hltResult.addTruncatedModuleId(fullResultTruncationID, severeTruncation);
    hltResult.addTruncatedModuleId(id, severeTruncation);
  }
  else if (currentSizeBytes+extraSizeBytes > m_truncationThresholds.value().at(id)) {
    // The data doesn't fit, flag this module's result as truncated
    ATH_MSG_DEBUG("Skipping adding data to truncated result with module ID " << id);
    hltResult.addTruncatedModuleId(id, severeTruncation);
  }
  else {
    // for truncation allowed collections, add first the interface, only if the Aux is can be stored
    if (truncationMode==Address::Truncation::Allowed){
      hltResult.addSerialisedData(id, deferredInterfaceBuffer.at(id));
    }
    // The data fits, so add it to the result
    ATH_MSG_DEBUG("Adding data to result with module ID " << id);
    hltResult.addSerialisedData(id, data);
  }
  return StatusCode::SUCCESS;
}
 
StatusCode TriggerEDMSerialiserTool::fillDebugInfo(const TruncationInfoMap& truncationInfoMap,
                                                   xAOD::TrigCompositeContainer& debugInfoCont,
                                                   HLT::HLTResultMT& resultToFill,
                                                   SGImplSvc* evtStore) const {
  // If full result truncation happened, flag all results as truncated to produce debug info for all
  if (resultToFill.getTruncatedModuleIds().count(fullResultTruncationID)>0) {
    ATH_MSG_ERROR("HLT result truncation on total size! Limit of "
                  << m_truncationThresholds.value().at(fullResultTruncationID)/1024./1024.
                  << " MB exceeded. Flagging all module IDs as truncated.");
    for (const auto& [id, data] : resultToFill.getSerialisedData()) {
      resultToFill.addTruncatedModuleId(id);
    }
  }
  // Loop over truncation info and fill histograms and debug info objects
  for (const auto& [id, truncationInfoVec] : truncationInfoMap) {
    if (resultToFill.getTruncatedModuleIds().count(id)>0) {
      // Create and fill a debug info object
      xAOD::TrigComposite* debugInfoThisModule = new xAOD::TrigComposite;
      debugInfoCont.push_back(debugInfoThisModule); // the container in event store takes ownership of debugInfoThisModule
      xAOD::TrigComposite::Accessor<uint16_t> moduleId("moduleId");
      xAOD::TrigComposite::Accessor<uint32_t> totalSize("totalSize");
      xAOD::TrigComposite::Accessor<std::vector<std::string>> typeNameVec("typeName");
      xAOD::TrigComposite::Accessor<std::vector<uint32_t>> sizeVec("size");
      xAOD::TrigComposite::Accessor<std::vector<char>> isRecordedVec("isRecorded");
      std::pair<std::string, size_t> largestRecorded{"None", 0};
      std::pair<std::string, size_t> largestDropped{"None", 0};
      std::pair<std::string, size_t> firstDropped{"None", 0};
      moduleId(*debugInfoThisModule) = id;
      uint32_t sizeSum = 0;
      bool severeTruncation = false;
      bool truncated = false;
      for (const TruncationInfo& truncationInfo : truncationInfoVec) {
        // Store typeName and size information
        sizeSum += truncationInfo.size;
        typeNameVec(*debugInfoThisModule).push_back(truncationInfo.addrPtr->persTypeName());
        sizeVec(*debugInfoThisModule).push_back(truncationInfo.size);
        isRecordedVec(*debugInfoThisModule).push_back(static_cast<char>(truncationInfo.recorded));
        if (truncationInfo.recorded && truncationInfo.size > largestRecorded.second) {
          largestRecorded = {truncationInfo.addrPtr->persTypeName(), truncationInfo.size};
        }
        if (!truncationInfo.recorded && truncationInfo.size > largestDropped.second) {
          largestDropped = {truncationInfo.addrPtr->persTypeName(), truncationInfo.size};
        }
        if (!truncationInfo.recorded && !truncated) {
          firstDropped = {truncationInfo.addrPtr->persTypeName(), truncationInfo.size};
          truncated = true;
        }
        // Decide if this was a severe truncation (event goes to debug stream)
        if (!truncationInfo.recorded) {
          severeTruncation |= (truncationInfo.addrPtr->truncationMode==Address::Truncation::Error);
        }
      }
      totalSize(*debugInfoThisModule) = sizeSum;
      msg(severeTruncation ? MSG::ERROR : MSG::WARNING)
        << "HLT result truncation" << (severeTruncation ? "." : " in low priority collections.")
        << " Module ID: " << id << ", limit: "
        << m_truncationThresholds.value().at(id)/1024. << " kB, total size: "
        << sizeSum/1024. << " kB, largest recorded collection: " << largestRecorded.first
        << " (" << largestRecorded.second/1024. << " kB), largest dropped collection: "
        << largestDropped.first << " (" << largestDropped.second/1024. << " kB), "
        << " first dropped collection: " <<firstDropped.first << " (" << firstDropped.second/1024. << " kB)"
        << endmsg;
      // Give more information on the chains which accepted this event
      using namespace TrigCompositeUtils;
      SG::ReadHandle<DecisionContainer> navigation(m_debugNavigationSummaryRHKey); // Implicit ctx lookup - OK, rare code path 
      const Decision* terminus = getTerminusNode(navigation);
      if (terminus) {
        std::stringstream ss;
        ss << "Passing chains in this event: ";
        for (const DecisionID chainID : decisionIDs(terminus)) {
          ss << HLT::Identifier(chainID).name() << ", ";
          addDecisionID(chainID, debugInfoThisModule); // Save this list also into the output, it is then accessible offline too
        }
        ATH_MSG_WARNING(ss.str());
      }
      // Monitoring
      const std::string prefix = severeTruncation ? "" : "Allowed";
      auto monModuleId = Monitored::Scalar<int>(prefix+"Truncation_ModuleId", id);
      auto monTotalSize = Monitored::Scalar<float>(prefix+"Truncation_TotalSize", sizeSum/1024.);
      auto monLargestName = Monitored::Scalar<std::string>(
        prefix+"Truncation_LargestName",
        largestRecorded.second > largestDropped.second ? largestRecorded.first : largestDropped.first);
      auto monLargestSize = Monitored::Scalar<float>(
        prefix+"Truncation_LargestSize",
        largestRecorded.second > largestDropped.second ? largestRecorded.second/1024. : largestDropped.second/1024.);
      auto mon = Monitored::Group(m_monTool, monModuleId, monTotalSize, monLargestName, monLargestSize);
    }
  }
  // Serialise and write the debug info only in case of truncation
  if (!debugInfoCont.empty()) {
    std::vector<Address> debugInfoAddressVec;
    const std::string debugInfoID = std::string("xAOD::TrigCompositeContainer#")+m_debugInfoWHKey.key()+";0";
    const std::string debugInfoAuxID = std::string("xAOD::TrigCompositeAuxContainer#")+m_debugInfoWHKey.key()+"Aux.;0";
    ATH_CHECK(addCollectionToSerialise(debugInfoID, debugInfoAddressVec));
    ATH_CHECK(addCollectionToSerialise(debugInfoAuxID, debugInfoAddressVec));
    std::vector<uint32_t> buffer;
    for (const Address& address : debugInfoAddressVec) {
      buffer.clear();
      ATH_CHECK( serialise(address, buffer, evtStore) );
      resultToFill.addSerialisedData(0, buffer); // 0 is the main result ID
      // It would be better to avoid hard-coding main result ID but it should not be configurable either
    }
  }
  return StatusCode::SUCCESS;
}
 
std::string TriggerEDMSerialiserTool::version( const std::string& name ) {
  if ( name.contains("DataVector") ) {
    const size_t start = name.find('_');
    return name.substr( start, name.find('>') - start );
  }
  const size_t pos = name.find('_');
  return (pos == std::string::npos ? std::string{} : name.substr( pos ));
}
 
std::set<uint16_t> TriggerEDMSerialiserTool::activeModuleIDs(const HLT::HLTResultMT& result) {
  std::set<uint16_t> activeIDs;
  for (const eformat::helper::StreamTag& st : result.getStreamTags()) {
    if (st.robs.empty() && st.dets.empty()) { // Full Event Building stream
      activeIDs.insert(0); // 0 is the main result ID
      continue;
    }
    for (const uint32_t robid : st.robs) {
      eformat::helper::SourceIdentifier sid(robid);
      if (sid.subdetector_id() != eformat::SubDetector::TDAQ_HLT) {
        continue;
      }
      activeIDs.insert(sid.module_id());
    }
  }
  return activeIDs;
}