AlgContextAuditor.cpp

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* (c) Copyright 1998-2025 CERN for the benefit of the LHCb and ATLAS collaborations *
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* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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#include <Gaudi/Auditor.h>
#include <GaudiKernel/EventContext.h>
#include <GaudiKernel/IAlgContextSvc.h>
#include <GaudiKernel/IAlgManager.h>
#include <GaudiKernel/IAlgorithm.h>
 
class IAlgContextSvc;

class AlgContextAuditor : public Gaudi::Auditor {
public:
  // IAuditor implementation
  void before( std::string const&, std::string const&, EventContext const& ) override;
  void after( std::string const&, std::string const&, EventContext const&, StatusCode const& ) override;
 
public:
  using Auditor::Auditor;
  StatusCode initialize() override;
  StatusCode finalize() override;
 
private:
  AlgContextAuditor()                                      = delete;
  AlgContextAuditor( const AlgContextAuditor& )            = delete;
  AlgContextAuditor& operator=( const AlgContextAuditor& ) = delete;
 
private:
  SmartIF<IAlgContextSvc> m_svc;
  SmartIF<IAlgManager> m_algMgr;
};
 
// mandatory auditor factory, needed for instantiation
DECLARE_COMPONENT( AlgContextAuditor )
 
StatusCode AlgContextAuditor::initialize() {
  return Auditor::initialize().andThen( [&] {
    m_svc = service( "AlgContextSvc", true );
    if ( !m_svc ) {
      error() << "Invalid pointer to IAlgContextSvc" << endmsg;
      return StatusCode::FAILURE; // RETURN
    }
    m_algMgr = serviceLocator();
    if ( !m_algMgr ) {
      error() << "Invalid pointer to IAlgManager" << endmsg;
      return StatusCode::FAILURE; // RETURN
    }
    return StatusCode::SUCCESS;
  } );
}
 
StatusCode AlgContextAuditor::finalize() {
  m_svc.reset();
  m_algMgr.reset();
  return Auditor::finalize();
}
 
void AlgContextAuditor::before( std::string const& event, std::string const& caller, EventContext const& context ) {
  if ( m_svc && ( event == Gaudi::IAuditor::Initialize || event == Gaudi::IAuditor::Execute ||
                  event == Gaudi::IAuditor::Finalize ) ) {
    SmartIF<IAlgorithm>& alg = m_algMgr->algorithm( caller, false );
    if ( alg ) m_svc->setCurrentAlg( alg, context ).ignore();
  }
}
 
void AlgContextAuditor::after( std::string const& event, std::string const& caller, EventContext const& context,
                               StatusCode const& ) {
  if ( m_svc && ( event == Gaudi::IAuditor::Initialize || event == Gaudi::IAuditor::Execute ||
                  event == Gaudi::IAuditor::Finalize ) ) {
    SmartIF<IAlgorithm>& alg = m_algMgr->algorithm( caller, false );
    if ( alg ) m_svc->unSetCurrentAlg( alg, context ).ignore();
  }
}