JetRecAlg.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
// JetRecAlg.cxx
 
#include <memory>
#include "JetRec/JetRecAlg.h"
#include "JetInterface/IJetExecuteTool.h"
#include "xAODJet/JetAuxContainer.h"
 
#include "AsgDataHandles/WriteDecorHandle.h"
 
#if !defined (GENERATIONBASE) && !defined (XAOD_ANALYSIS)
#include "AthenaMonitoringKernel/Monitored.h"
#include "GaudiKernel/SystemOfUnits.h"
#endif
 
using std::string;
 
//**********************************************************************
 
StatusCode JetRecAlg::initialize() {
 
  ATH_CHECK(m_output.initialize());
 
  if(!m_parentKey.empty()) m_parentKey = m_output.key() + "." + m_parentKey.key();
  ATH_CHECK(m_parentKey.initialize(!m_parentKey.empty()));
 
  ATH_CHECK(m_jetprovider.retrieve());
  // Some providers (e.g. copy) need the output WriteHandle
  // to be provided during initialisation
  ATH_CHECK(m_jetprovider->initWithOutput(m_output));
 
  ATH_MSG_INFO("Initialized IJetProvider : "<< m_jetprovider->name());
 
  ATH_MSG_DEBUG("Initialize .... List of modifiers: ");
  ATH_CHECK(m_modifiers.retrieve());
  for(const ToolHandle<IJetModifier>& t : m_modifiers){
    ATH_MSG_DEBUG("    --> : "<< t->name());
  }
 
  ATH_CHECK(m_output.initialize());
 
#if !defined (GENERATIONBASE) && !defined (XAOD_ANALYSIS)
  if (!m_monTool.empty()) ATH_CHECK(m_monTool.retrieve());
#endif
 
  return StatusCode::SUCCESS;
}
 
//**********************************************************************
 
#if !defined (GENERATIONBASE) && !defined (XAOD_ANALYSIS)
#define DOMONITORING
#endif
 
StatusCode JetRecAlg::execute(const EventContext& ctx) const {
  // Get JetContainer by running fastjet, grooming or copying existing jets...
  // Pass in the WriteHandle so that the provider can do the record, and we
  // needn't know the type of the jet aux container
  // We can subsequently access the jets from the handle and don't have to
  // worry about memory management.
 
#ifdef DOMONITORING
  auto t_total = Monitored::Timer<std::chrono::milliseconds>( "TIME_jetreco" );
  auto t_jpv = Monitored::Timer<std::chrono::milliseconds>( "TIME_jetprovider" );
  auto t_mod = Monitored::Timer<std::chrono::milliseconds>( "TIME_jetmod" );
#endif
 
  SG::WriteHandle<xAOD::JetContainer> jetContHandle(m_output,ctx);
  static const SG::AuxElement::ConstAccessor<ElementLink<xAOD::JetContainer> > parentELacc("Parent_TEMP");
 
  // Define a scope to ease monitoring of the JetProvider action
  {
#ifdef DOMONITORING
    Monitored::ScopedTimer time_provider(t_jpv);
#endif
    ATH_CHECK( m_jetprovider->getAndRecordJets(jetContHandle) );
    ATH_MSG_DEBUG("Created jet container of size "<< (*jetContHandle).size() << "  | writing to "<< m_output.key() );
 
    if(!m_parentKey.empty()){
      SG::WriteDecorHandle<xAOD::JetContainer, ElementLink<xAOD::JetContainer>> parentDecorHandle(m_parentKey,ctx);
      for (xAOD::Jet* jet : *jetContHandle)
    parentDecorHandle(*jet) = parentELacc(*jet);
    }
  }
 
  // Define a scope to ease monitoring of the JetModifier action
  {
#ifdef DOMONITORING
    Monitored::ScopedTimer time_modifiers(t_mod);
#endif
    ATH_MSG_DEBUG("Applying jet modifiers to " << m_output.key());
    // Calculate moments, calibrate, sort, filter...  -----------
    for(const ToolHandle<IJetModifier>& t : m_modifiers){
    ATH_MSG_DEBUG("Running " << t.name());
      ATH_CHECK(t->modify(*jetContHandle));
    }
  }
 
#ifdef DOMONITORING
  // monitor jet multiplicity and basic jet kinematics
  auto njets = Monitored::Scalar<int>("JET_n");
  njets      = jetContHandle->size();
  constexpr float invGeV = 1./Gaudi::Units::GeV;
  auto pt    = Monitored::Collection("JET_pt",  *jetContHandle, [c=invGeV]( const xAOD::Jet* jet ) { return jet->pt()*c; });
  auto et    = Monitored::Collection("JET_et",  *jetContHandle, [c=invGeV]( const xAOD::Jet* jet ) { return jet->p4().Et()*c; });
  auto mass  = Monitored::Collection("JET_m",   *jetContHandle, [c=invGeV]( const xAOD::Jet* jet ) { return jet->m()*c; });
  auto eta   = Monitored::Collection("JET_eta", *jetContHandle, []( const xAOD::Jet* jet ) { return jet->eta(); });
  auto phi   = Monitored::Collection("JET_phi", *jetContHandle, []( const xAOD::Jet* jet ) { return jet->phi(); });
 
  auto mon   = Monitored::Group(m_monTool,t_total,t_jpv,t_mod,njets,pt,et,mass,eta,phi);
#endif
 
 
  return StatusCode::SUCCESS;
 
}
 
//**********************************************************************