AlgTool.cpp

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/***********************************************************************************\
* (c) Copyright 1998-2025 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#include <Gaudi/Algorithm.h>
#include <Gaudi/Auditor.h>
#include <GaudiKernel/AlgTool.h>
#include <GaudiKernel/DataHandleHolderVisitor.h>
#include <GaudiKernel/GaudiException.h>
#include <GaudiKernel/Guards.h>
#include <GaudiKernel/IDataManagerSvc.h>
#include <GaudiKernel/IMessageSvc.h>
#include <GaudiKernel/ISvcLocator.h>
#include <GaudiKernel/Service.h>
#include <GaudiKernel/ServiceLocatorHelper.h>
#include <GaudiKernel/System.h>
#include <GaudiKernel/ToolHandle.h>
 
namespace {
  template <typename FUN>
  StatusCode attempt( AlgTool& tool, const char* label, FUN&& fun ) {
    try {
      return fun();
    } catch ( const GaudiException& Exception ) {
      MsgStream log( tool.msgSvc(), tool.name() + "." + label );
      log << MSG::FATAL << " Exception with tag=" << Exception.tag() << " is caught" << endmsg;
      log << MSG::ERROR << Exception << endmsg;
    } catch ( const std::exception& Exception ) {
      MsgStream log( tool.msgSvc(), tool.name() + "." + label );
      log << MSG::FATAL << " Standard std::exception is caught" << endmsg;
      log << MSG::ERROR << Exception.what() << endmsg;
    } catch ( ... ) {
      MsgStream log( tool.msgSvc(), tool.name() + "." + label );
      log << MSG::FATAL << "UNKNOWN Exception is caught" << endmsg;
    }
    return StatusCode::FAILURE;
  }
} // namespace
 
StatusCode AlgTool::queryInterface( const InterfaceID& riid, void** ppvi ) {
  if ( !ppvi ) { return StatusCode::FAILURE; }
  StatusCode sc = base_class::queryInterface( riid, ppvi );
  if ( sc.isSuccess() ) return sc;
  auto i = std::find_if( std::begin( m_interfaceList ), std::end( m_interfaceList ),
                         [&]( const std::pair<InterfaceID, void*>& item ) { return item.first.versionMatch( riid ); } );
  if ( i == std::end( m_interfaceList ) ) {
    *ppvi = nullptr;
    return Status::NO_INTERFACE;
  }
  *ppvi = i->second;
  addRef();
  return StatusCode::SUCCESS;
}
 
void const* AlgTool::i_cast( const InterfaceID& riid ) const {
  if ( auto output = base_class::i_cast( riid ) ) { return output; }
  if ( auto i =
           std::find_if( std::begin( m_interfaceList ), std::end( m_interfaceList ),
                         [&]( const std::pair<InterfaceID, void*>& item ) { return item.first.versionMatch( riid ); } );
       i != std::end( m_interfaceList ) ) {
    return i->second;
  }
  return nullptr;
}
 
const std::string& AlgTool::name() const { return m_name; }
 
const std::string& AlgTool::type() const { return m_type; }
 
const IInterface* AlgTool::parent() const { return m_parent; }
 
SmartIF<ISvcLocator>& AlgTool::serviceLocator() const { return m_svcLocator; }
 
IDataProviderSvc* AlgTool::evtSvc() const {
  if ( !m_evtSvc ) {
    m_evtSvc = service( "EventDataSvc", true );
    if ( !m_evtSvc ) { throw GaudiException( "Service [EventDataSvc] not found", name(), StatusCode::FAILURE ); }
  }
  return m_evtSvc.get();
}
IToolSvc* AlgTool::toolSvc() const {
  if ( !m_ptoolSvc ) {
    m_ptoolSvc = service( "ToolSvc", true );
    if ( !m_ptoolSvc ) { throw GaudiException( "Service [ToolSvc] not found", name(), StatusCode::FAILURE ); }
  }
  return m_ptoolSvc.get();
}
 
AlgTool::AlgTool( std::string type, std::string name, const IInterface* parent )
    : m_type( std::move( type ) ), m_name( std::move( name ) ), m_parent( parent ) {
  addRef(); // Initial count set to 1
 
  IInterface* _p = const_cast<IInterface*>( parent );
 
  if ( Gaudi::Algorithm* _alg = dynamic_cast<Gaudi::Algorithm*>( _p ) ) {
    m_svcLocator = _alg->serviceLocator();
  } else if ( Service* _svc = dynamic_cast<Service*>( _p ) ) {
    m_svcLocator = _svc->serviceLocator();
  } else if ( AlgTool* _too = dynamic_cast<AlgTool*>( _p ) ) {
    m_svcLocator = _too->serviceLocator();
  } else if ( Gaudi::Auditor* _aud = dynamic_cast<Gaudi::Auditor*>( _p ) ) {
    m_svcLocator = _aud->serviceLocator();
  } else {
    throw GaudiException( "Failure to create tool '" + m_type + "/" + m_name + "': illegal parent type '" +
                              System::typeinfoName( typeid( *_p ) ) + "'",
                          "AlgTool", StatusCode::FAILURE );
  }
 
  // inherit output level from parent
  // get the "OutputLevel" property from parent
  if ( SmartIF<IProperty> pprop( _p ); pprop && pprop->hasProperty( "OutputLevel" ) ) {
    m_outputLevel.assign( pprop->getProperty( "OutputLevel" ) );
  }
 
  // Auditor monitoring properties
  // Initialize the default value from ApplicationMgr AuditAlgorithms
  Gaudi::Property<bool> audit( "AuditTools", false );
  // note that here we need that the service locator is already defined
  if ( auto appMgr = serviceLocator()->service<IProperty>( "ApplicationMgr" ) ) {
    appMgr->getProperty( &audit ).ignore();
  }
 
  m_auditorInitialize   = audit;
  m_auditorStart        = audit;
  m_auditorStop         = audit;
  m_auditorFinalize     = audit;
  m_auditorReinitialize = audit;
  m_auditorRestart      = audit;
}
 
StatusCode AlgTool::sysInitialize() {
  return attempt( *this, "sysInitialize", [&]() {
    m_targetState = Gaudi::StateMachine::ChangeState( Gaudi::StateMachine::INITIALIZE, m_state );
    Gaudi::Guards::AuditorGuard guard( name(),
                                       // check if we want to audit the initialize
                                       m_auditorInitialize ? auditorSvc() : nullptr, Gaudi::IAuditor::Initialize );
    StatusCode                  sc = initialize();
    if ( !sc ) return sc;
 
    m_state = m_targetState;
    if ( m_updateDataHandles ) acceptDHVisitor( m_updateDataHandles.get() );
 
    // check for explicit circular data dependencies in declared handles
    DataObjIDColl out;
    for ( auto& h : outputHandles() ) {
      if ( !h->objKey().empty() ) out.emplace( h->fullKey() );
    }
    for ( auto& h : inputHandles() ) {
      if ( !h->objKey().empty() && out.find( h->fullKey() ) != out.end() ) {
        error() << "Explicit circular data dependency found for id " << h->fullKey() << endmsg;
        sc = StatusCode::FAILURE;
      }
    }
 
    if ( !sc ) return sc;
 
    // visit all sub-tools, build full set
    DHHVisitor avis( m_inputDataObjs, m_outputDataObjs );
    acceptDHVisitor( &avis );
 
    // initialize handles
    initDataHandleHolder(); // this should 'freeze' the handle configuration.
 
    return sc;
  } );
}
StatusCode AlgTool::initialize() {
  // For the time being there is nothing to be done here.
  // Setting the properties is done by the ToolSvc calling setProperties()
  // explicitly.
  return StatusCode::SUCCESS;
}
 
StatusCode AlgTool::sysStart() {
  return attempt( *this, "sysStart", [&]() {
    m_targetState = Gaudi::StateMachine::ChangeState( Gaudi::StateMachine::START, m_state );
    Gaudi::Guards::AuditorGuard guard( name(),
                                       // check if we want to audit the initialize
                                       m_auditorStart ? auditorSvc() : nullptr, Gaudi::IAuditor::Start );
    StatusCode                  sc = start();
    if ( sc.isSuccess() ) m_state = m_targetState;
    return sc;
  } );
}
 
StatusCode AlgTool::start() {
  // For the time being there is nothing to be done here.
  return StatusCode::SUCCESS;
}
 
StatusCode AlgTool::sysStop() {
  return attempt( *this, "sysStop", [&]() {
    m_targetState = Gaudi::StateMachine::ChangeState( Gaudi::StateMachine::STOP, m_state );
    Gaudi::Guards::AuditorGuard guard( name(),
                                       // check if we want to audit the initialize
                                       m_auditorStop ? auditorSvc() : nullptr, Gaudi::IAuditor::Stop );
    StatusCode                  sc = stop();
    if ( sc.isSuccess() ) m_state = m_targetState;
    return sc;
  } );
}
 
StatusCode AlgTool::stop() {
  // For the time being there is nothing to be done here.
  return StatusCode::SUCCESS;
}
 
StatusCode AlgTool::sysFinalize() {
  return attempt( *this, "sysFinalize", [&]() {
    m_targetState = Gaudi::StateMachine::ChangeState( Gaudi::StateMachine::FINALIZE, m_state );
    Gaudi::Guards::AuditorGuard guard( name(),
                                       // check if we want to audit the initialize
                                       m_auditorFinalize ? auditorSvc() : nullptr, Gaudi::IAuditor::Finalize );
    StatusCode                  sc = finalize();
    if ( sc.isSuccess() ) m_state = m_targetState;
    return sc;
  } );
}
StatusCode AlgTool::finalize() {
  // For the time being there is nothing to be done here.
  return StatusCode::SUCCESS;
}
 
StatusCode AlgTool::sysReinitialize() {
 
  // Check that the current status is the correct one.
  if ( Gaudi::StateMachine::INITIALIZED != FSMState() ) {
    error() << "sysReinitialize(): cannot reinitialize tool not initialized" << endmsg;
    return StatusCode::FAILURE;
  }
 
  return attempt( *this, "SysReinitialize()", [&]() {
    Gaudi::Guards::AuditorGuard guard( name(),
                                       // check if we want to audit the initialize
                                       m_auditorReinitialize ? auditorSvc() : nullptr, Gaudi::IAuditor::ReInitialize );
    return reinitialize();
  } );
}
 
StatusCode AlgTool::reinitialize() {
  /* @TODO
   * MCl 2008-10-23: the implementation of reinitialize as finalize+initialize
   *                 is causing too many problems
   *
  // Default implementation is finalize+initialize
  StatusCode sc = finalize();
  if (sc.isFailure()) {
    error() << "reinitialize(): cannot be finalized" << endmsg;
    return sc;
  }
  sc = initialize();
  if (sc.isFailure()) {
    error() << "reinitialize(): cannot be initialized" << endmsg;
    return sc;
  }
  */
  return StatusCode::SUCCESS;
}
 
StatusCode AlgTool::sysRestart() {
 
  // Check that the current status is the correct one.
  if ( Gaudi::StateMachine::RUNNING != FSMState() ) {
    error() << "sysRestart(): cannot reinitialize tool not started" << endmsg;
    return StatusCode::FAILURE;
  }
 
  return attempt( *this, "sysRestart", [&]() {
    m_targetState = Gaudi::StateMachine::ChangeState( Gaudi::StateMachine::START, m_state );
    Gaudi::Guards::AuditorGuard guard( name(),
                                       // check if we want to audit the initialize
                                       m_auditorRestart ? auditorSvc() : nullptr, Gaudi::IAuditor::ReStart );
    return restart();
  } );
}
 
StatusCode AlgTool::restart() {
  // Default implementation is stop+start
  StatusCode sc = stop();
  if ( sc.isFailure() ) {
    error() << "restart(): cannot be stopped" << endmsg;
    return sc;
  }
  sc = start();
  if ( sc.isFailure() ) {
    error() << "restart(): cannot be started" << endmsg;
    return sc;
  }
  return StatusCode::SUCCESS;
}
 
AlgTool::~AlgTool() {
  if ( m_pMonitorSvc ) { m_pMonitorSvc->undeclareAll( this ); }
}
 
void AlgTool::initToolHandles() const {
  auto init_one = [&]( BaseToolHandle* th ) {
    if ( !th->isEnabled() ) {
      if ( msgLevel( MSG::DEBUG ) && !th->typeAndName().empty() )
        debug() << "ToolHandle " << th->typeAndName() << " not used" << endmsg;
      return;
    }
    if ( !th->get() ) {
      auto sc = th->retrieve();
      if ( sc.isFailure() ) {
        throw GaudiException( "Failed to retrieve tool " + th->typeAndName(), this->name(), StatusCode::FAILURE );
      }
    }
    auto* tool = th->get();
    if ( msgLevel( MSG::DEBUG ) )
      debug() << "Adding " << ( th->isPublic() ? "public" : "private" ) << " ToolHandle tool " << tool->name() << " ("
              << tool->type() << ")" << endmsg;
    m_tools.push_back( tool );
  };
 
  for ( auto thArr : m_toolHandleArrays ) {
    if ( msgLevel( MSG::DEBUG ) )
      debug() << "Registering all Tools in ToolHandleArray " << thArr->propertyName() << endmsg;
    // Iterate over its tools:
    for ( auto toolHandle : thArr->getBaseArray() ) {
      // Try to cast it into a BaseToolHandle pointer:
      BaseToolHandle* bth = dynamic_cast<BaseToolHandle*>( toolHandle );
      if ( bth ) {
        init_one( bth );
      } else {
        error() << "Error retrieving Tool " << toolHandle->typeAndName() << " in ToolHandleArray "
                << thArr->propertyName() << ". Not registered" << endmsg;
      }
    }
  }
 
  for ( BaseToolHandle* th : m_toolHandles ) init_one( th );
 
  m_toolHandlesInit = true;
}
 
const std::vector<IAlgTool*>& AlgTool::tools() const {
  if ( !m_toolHandlesInit ) initToolHandles();
 
  return m_tools;
}
 
std::vector<IAlgTool*>& AlgTool::tools() {
  if ( !m_toolHandlesInit ) initToolHandles();
 
  return m_tools;
}
 
SmartIF<IService> AlgTool::service( std::string_view name, const bool createIf, const bool quiet ) const {
  const ServiceLocatorHelper helper( *serviceLocator(), *this );
  return helper.service( name, quiet, createIf );
}
 
IAuditorSvc* AlgTool::auditorSvc() const {
  if ( !m_pAuditorSvc ) {
    m_pAuditorSvc = service( "AuditorSvc", true );
    if ( !m_pAuditorSvc ) { throw GaudiException( "Service [AuditorSvc] not found", name(), StatusCode::FAILURE ); }
  }
  return m_pAuditorSvc.get();
}
 
void AlgTool::acceptDHVisitor( IDataHandleVisitor* vis ) const {
  vis->visit( this );
 
  for ( auto tool : tools() ) vis->visit( dynamic_cast<AlgTool*>( tool ) );
}