TrigSerTPTool.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
// ROOT include(s):
#include <TClass.h>
 
// Gaudi/Athena include(s):
#include "GaudiKernel/System.h"
#include "AthenaKernel/IDictLoaderSvc.h"
#include "AthenaKernel/ITPCnvBase.h"
#include "AthenaKernel/errorcheck.h"
 
// Local include(s):
#include "TrigSerializeTP/TrigSerTPTool.h"
 
 
TrigSerTPTool::TrigSerTPTool( const std::string& type,
                              const std::string& name,
                              const IInterface* parent) :
   AthAlgTool( type, name, parent ),
   m_dictSvc( "AthDictLoaderSvc", name ),
   m_useAthDictLoader( true ),
   m_tpcnvsvc( "AthTPCnvSvc", name ) {
 
   declareInterface< TrigSerTPTool >( this );
 
   declareProperty( "TPMap", m_TPmap, "map of T->P classes" );
   declareProperty( "useAthDictLoader", m_useAthDictLoader,
                    "use AthDictLoaderSvc instead of plain ROOT" );
}
 
StatusCode TrigSerTPTool::initialize(){
 
   // Greet the user:
   ATH_MSG_INFO( "Initializing" );
 
   // Retrieve the used services:
   ATH_CHECK( m_dictSvc.retrieve() );
   ATH_CHECK( m_tpcnvsvc.retrieve() );
 
   /* When a P<->T conversion is requested, this tool makes a call to TClass::GetClass.
    * The way it's done here can cause performance issues in some circumstances.
    * For example, reading data16 RAW files trigger a P->T conversion from
    * DataVector<xAOD::TauJet_v2> to DataVector<xAOD::TauJet_v3> in RAWtoALL/22.0.62.
    * The problem is that the converter returns the full class name through
    * ITPCnvBase::transientTInfo(), which in this case resolves into
    * DataVector<xAOD::TauJet_v3,DataVector<xAOD::IParticle,DataModel_detail::NoBase> >
    * Passing this directly to TClass::GetClass causes AutoLoading/HeaderParsing
    * which notoriously allocates memory and never releases it. Here, we work
    * around this problem by stripping the base class information from the name
    * that's passed to TClass::GetClass, in this case simply DataVector<xAOD::TauJet_v3>
    */
   m_clNameRules.add("DataVector<$T, $B>", "DataVector<$T>");
 
   return StatusCode::SUCCESS;
}
 
ITPCnvBase* TrigSerTPTool::getConverter( const std::string& persistent ) const
{
   std::lock_guard<std::mutex> lock(m_convertersCacheMutex);
   ITPCnvBase* cnvtr = m_convertesCache[persistent];
   if ( cnvtr ) [[likely]]
      return cnvtr;
 
   // no converter, we need to find it, first the trigger specific one
   cnvtr = m_tpcnvsvc->p2t_cnv( persistent, Athena::TPCnvType::Trigger );
   if( ! cnvtr ) {
      // If there is no such thing, try a generic one:
      cnvtr = m_tpcnvsvc->p2t_cnv( persistent );
   }
   m_convertesCache[persistent] = cnvtr;
   return cnvtr;
}
 
void* TrigSerTPTool::convertTP( const std::string &clname, void *ptr,
                                std::string &persName ) const
{
   ATH_MSG_DEBUG( "TrigSerTPTool::convertTP" );
 
   //pers and persName set only after successful conversion
   persName = "";
   void *pers( 0 );
 
   // Start by trying to find the correct persistent class from the TP map
   // Otherwise, use the internal logic of the TPCnvSvc
   const auto tpItr = m_TPmap.find( clname );
   if( tpItr == m_TPmap.end() ) {
      REPORT_MESSAGE( MSG::ERROR )
         << "Transient class " << clname 
         << " is not in the T/P Converter map";
      return 0;
   }
   persName = tpItr->second;
 
   ITPCnvBase* cnvtr = getConverter( persName );
   if( ! cnvtr ) {
      ATH_MSG_ERROR( "T/P Converter for transient class " << tpItr->first
                     << " persistent class " << persName << " could not be retrieved");
      return nullptr;
   }
 
   // Create a persistent object:
   const std::string persname =
      m_clNameRules.apply( System::typeinfoName( cnvtr->persistentTInfo() ) );
   TClass *persObjCl = getClass( persname );
   void *persptr( 0 );
   if( persObjCl ) {
      persptr = persObjCl->New();
      ATH_MSG_DEBUG( "created object of " << persptr << " at " << persptr  );
   } else {
      REPORT_MESSAGE( MSG::ERROR )
         << "Couldn't find dictionary for type " << persname;
      return 0;
   }
 
   // Do the conversion:
   ATH_MSG_DEBUG( "invoking TP for " << clname  << " at " << ptr );
   try {
      cnvtr->transToPersUntyped( ptr, persptr, msg() );
      persName = std::move(persname);
      pers = persptr;
      ATH_MSG_DEBUG( "succeeded at " << persptr  );
   }
   catch( const std::runtime_error& e ){
 
      //delete persObjCl->New();
      const std::string issue = e.what();
      if( issue.find( "is deprecated" ) != std::string::npos ) {
         ATH_MSG_INFO( "An exception " << e.what() );
      } else {
         pers = 0;
         REPORT_MESSAGE( MSG::ERROR ) << "An exception occurred: " << e.what();
      }
   }
 
   // Return the converted object:
   return pers;
}
 
void* TrigSerTPTool::convertPT( const std::string &persName, void *pers,
                                std::string& transName ) const
{
   // First look for a trigger specific converter:
   ITPCnvBase* cnvtr =
      m_tpcnvsvc->p2t_cnv( persName, Athena::TPCnvType::Trigger );
   if( ! cnvtr ) {
      // If there is no such thing, try a generic one:
      cnvtr = m_tpcnvsvc->p2t_cnv( persName );
   }
   if( ! cnvtr ) {
      REPORT_MESSAGE( MSG::ERROR )
         << "T/P Converter for persistent class "
         << persName << " could not be retrieved";
      return 0;
   }
 
   // Get the name of the transient class:
   transName = m_clNameRules.apply( System::typeinfoName( cnvtr->transientTInfo() ) );
 
   // Create the transient object:
   TClass *transCl = getClass( transName );
   void *trans( 0 );
   if( transCl ){
      trans = transCl->New();
      ATH_MSG_DEBUG( "trans  " << trans );
   }
 
   // Do the conversion:
   ATH_MSG_DEBUG( "invoking PT for " << transName );
   try {
      cnvtr->persToTransWithKeyUntyped( pers, trans, "", msg() );
      ATH_MSG_DEBUG( " succeeded at " << trans );
   }
   catch (const std::runtime_error& e){
      REPORT_MESSAGE( MSG::ERROR ) << "An exception occurred: " << e.what();
      //it should destruct trans here (is it in a good state?)
      trans = 0;
   }
 
   // Return the converted object:
   return trans;
}
 
const std::string&
TrigSerTPTool::persClassName( const std::string& transClassName ) const {
 
   // Try to extract from the TP map
   const auto tpItr = m_TPmap.find( transClassName );
   if( tpItr == m_TPmap.end() ) {
      REPORT_MESSAGE( MSG::ERROR )
         << "Transient class " << transClassName
         << " is not in the T/P Converter map";
      static const std::string dummy( "" );
      return dummy;
   }
 
   // Return the persistent class name:
   return tpItr->second;
}
 
TClass *TrigSerTPTool::getClass( const std::string &cname ) const {
 
   TClass *cl( 0 );
   if( m_useAthDictLoader && m_dictSvc ){
      m_dictSvc->load_type( cname );
   }
   cl = TClass::GetClass( cname.c_str() );
   return cl;
}