MixingEventSelector.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#include "CxxUtils/checker_macros.h"
ATLAS_NO_CHECK_FILE_THREAD_SAFETY;  // non-MT EventSelector
 
#include "MixingEventSelector.h"
#include "AthenaKernel/IAtRndmGenSvc.h"
#include "EventInfo/MergedEventInfo.h"
#include "EventInfo/EventInfo.h"
#include "EventInfo/EventID.h"
#include "EventInfo/EventType.h"
#include "EventInfo/TriggerInfo.h"
#include "AthenaKernel/ClassID_traits.h"
#include "AthenaKernel/StorableConversions.h"
#include "StoreGate/StoreGateSvc.h"
#include "SGTools/DataProxy.h"
#include "AthenaKernel/getMessageSvc.h"
 
#include "GaudiKernel/GaudiException.h"
#include "GaudiKernel/TypeNameString.h"
#include "GaudiKernel/MsgStream.h"
#include "GaudiKernel/GenericAddress.h"
#include "CLHEP/Random/RandFlat.h"
#include "CxxUtils/StringUtils.h"
#include <charconv>
#include <algorithm>
#include <cassert>
#include <functional>
#include <iostream>
#include <fstream>
#include <stdexcept>
#include <sstream>
#include <string>
 
using namespace std;
using SG::DataProxy;
 
#ifdef DEBUG_OUTPUT_STATUS
ofstream outfile2("status.txt");
#endif
 
MixingEventSelector::MixingEventSelector(const string& name, ISvcLocator* svc) :
  base_class(name,svc),
  m_pCurrentTrigger(m_trigList.end()),
  m_pEventStore( "StoreGateSvc", name )
{
}
 
MixingEventSelector::~MixingEventSelector() { 
}
 
StatusCode
MixingEventSelector::initialize() {
  ATH_MSG_INFO ("Initializing " << name());
 
// defer this (it triggers a init loop via PPS 
//   if (!m_pEventStore.retrieve().isSuccess()) 
//     return StatusCode::FAILURE;
 
  //setup random stream
  CLHEP::HepRandomEngine* collEng(m_atRndmSvc->GetEngine(m_randomStreamName.value()));
  if(nullptr == collEng ) {
    ATH_MSG_ERROR ("can not get random stream " << m_randomStreamName.value());
    return StatusCode::FAILURE;
  }
  //flat distribution in [0,1] range
  m_chooseRangeRand = std::make_unique<CLHEP::RandFlat>(*(collEng), 0.0, 1.0);
 
  ATH_CHECK( m_helperTools.retrieve() );
  for (ToolHandle<IAthenaSelectorTool>& tool : m_helperTools) {
    ATH_CHECK( tool->postInitialize() );
  }
 
  return StatusCode::SUCCESS;
}
 
StatusCode
MixingEventSelector::finalize() {
  ATH_MSG_DEBUG ("Finalizing " << name());
 
  for (ToolHandle<IAthenaSelectorTool>& tool : m_helperTools) {
    tool->preFinalize().ignore();
  }
 
  const std::string& fname(m_statusFileName.value());
  ofstream outfile(fname.c_str());
  if ( outfile ) {
    TriggerList::const_iterator i(m_trigList.begin());
    TriggerList::const_iterator iEnd(m_trigList.end());
    while (i != iEnd) outfile << (*i++).toString();
  }  else if (!fname.empty()) {
    ATH_MSG_WARNING("unable to open trigger list status file " << fname);
  }
 
  return StatusCode::SUCCESS;
}
 
 
void
MixingEventSelector::setUpTriggerList(Gaudi::Details::PropertyBase&) {
  using std::placeholders::_1;
  m_trigList = TriggerList();
  for_each(m_triggerListProp.value().begin(), m_triggerListProp.value().end(),  
       bind(&MixingEventSelector::decodeTrigger, this, _1));
  setCurrentTrigger();
}
 
void 
MixingEventSelector::decodeTrigger(const std::string & triggDescr) {
  //all this would be much more readable without error reporting...
  const auto tokens = CxxUtils::tokenize(triggDescr, " :");
  //we need exactly three tokens: selector name, first and last event 2 B read
  if (tokens.size() == 3) {
    auto iToken = tokens.begin();
      Gaudi::Utils::TypeNameString selTN(*iToken++);
      //get selector
      SmartIF<IEvtSelector> pSelector(serviceLocator()->service(selTN));
      if (pSelector) {
        //FIXME   if (!pSelector.done()) {
        //try to add to trig list
        unsigned int firstEvt{};
        unsigned int lastEvt{};
        auto string1 = *iToken++;
        auto string2 = *iToken;
        auto [ptr1, ec1] = std::from_chars(string1.data(), string1.data() + string1.size(), firstEvt);
        auto [ptr2, ec2] = std::from_chars(string2.data(), string2.data() + string2.size(), lastEvt);
        if ( ec1 != std::errc() || ec2 != std::errc() ) {
          ATH_MSG_ERROR("decodeTrigger: Can't cast ["<< string1 << " " << string2  << "] to double(frequency). SKIPPING");
        } else {
        if (m_trigList.add(Trigger(pSelector, firstEvt, lastEvt))) {
          if (msgLvl(MSG::DEBUG)) {
            SmartIF<INamedInterface> pNamed(pSelector);
            if (pNamed) {
              msg() << "decodeTrigger: added selector " << pNamed->name()
                    << " first event to be read " << firstEvt
                    << " last event to be read " << lastEvt << endmsg;
            }
          }
        } else {
          ATH_MSG_ERROR
            ("decodeTrigger: Selector ["
             << selTN.type() << '/' << selTN.name()
             << "] not added");
        } //can add to range
        }
      } else {
        ATH_MSG_ERROR 
          ("decodeTrigger: Selector ["
           << selTN.type() << '/' << selTN.name()
           << "] can not be found or created");
      } //selector available
  } else {
    ATH_MSG_ERROR
      ("decodeTrigger: Badly formatted descriptor [" 
       << triggDescr << "]. SKIPPING");
  } //can parse property string
}
 
#ifndef NDEBUG
#define FORWARD___DEBUG( METHOD )\
  { ATH_MSG_VERBOSE ("forwarding " << #METHOD << " to service "\
  << (validTrigger() ? currentTrigger()->name() : "NONE")); }
#else
#define FORWARD___DEBUG( METHOD )
#endif
 
StatusCode MixingEventSelector::createContext(IEvtSelector::Context*& pctxt) const {
  pctxt=nullptr;
  if (!validTrigger()) return StatusCode::FAILURE;
  TriggerList::iterator iTr(m_trigList.begin());
  StatusCode sc(StatusCode::FAILURE);
  while (iTr != m_trigList.end() && (sc=(iTr++)->createContext(pctxt)).isSuccess()) ;
  return sc;
}
 
StatusCode
MixingEventSelector::next(IEvtSelector::Context& /*c*/) const {
  StatusCode sc(StatusCode::FAILURE);
  do {
#ifdef DEBUG_OUTPUT_STATUS
    TriggerList::const_iterator i(m_trigList.begin()); 
    TriggerList::const_iterator iEnd(m_trigList.end());
    while (i != iEnd) outfile2 << (*i++).toString();  //output status
#endif
    setCurrentTrigger();
    sc = currentTrigger()->next();
    if (sc.isFailure()){
      m_trigList.remove(m_pCurrentTrigger);
      continue;  // we have to add  "continue;" after "m_trigList.remove(m_pCurrentTrigger);
    }
  } while ((sc.isFailure() || currentTrigger()->done()) &&  !m_trigList.empty() );
  // use !m_trigList.empty() to replace validTrigger(), which is not working well
 
  std::vector<ToolHandle<IAthenaSelectorTool> >::const_iterator 
    i(m_helperTools.begin()), iE(m_helperTools.end());
  while (i != iE) ((*i++)->preNext()).ignore();
 
  ++m_eventPos;
  FORWARD___DEBUG( next );  
 
  i=m_helperTools.begin(); iE=m_helperTools.end();
  while (sc.isSuccess() && (i != iE)) {
    sc =(*i)->postNext();
    if (sc.isRecoverable()) 
      ATH_MSG_INFO("Request skipping event from: " << (*i)->name());
    else if (sc.isFailure()) 
      ATH_MSG_WARNING((*i)->name() << ":postNext failed");
    ++i;
  }
  return sc;
}
 
 
StatusCode
MixingEventSelector::createAddress(const IEvtSelector::Context& /*c*/, 
                   IOpaqueAddress*& pAddr) const { 
  pAddr=nullptr;
  if (!validTrigger()) return StatusCode::FAILURE;
 
  FORWARD___DEBUG( createAddress )
  return (currentTrigger()->createAddress(pAddr).isSuccess() &&
          pAddr != nullptr) ? StatusCode::SUCCESS : StatusCode::FAILURE;
}
 
StatusCode
MixingEventSelector::preLoadAddresses(StoreID::type /*storeID*/,
                                     IAddressProvider::tadList& /*tads*/  ) {
    return StatusCode::SUCCESS;
}
 
StatusCode
MixingEventSelector::loadAddresses(StoreID::type  storeID,
                                   IAddressProvider::tadList& /*tads*/  )
{
  if (storeID != StoreID::EVENT_STORE && storeID != StoreID::PILEUP_STORE)
    return StatusCode::SUCCESS;
 
  CLID mclid = ClassID_traits<MergedEventInfo>::ID();
  if (!m_pEventStore->contains (mclid, m_mergedEventInfoKey)) {
    // We create the DataProxy here rather than relying on ProxyProvideSvc
    // to do it because we want to set a non-default dataloader on the proxy.
    SG::TransientAddress tad (mclid,
                              m_mergedEventInfoKey,
                              new GenericAddress (0, mclid),
                              false);
    auto dp = std::make_unique<SG::DataProxy> (std::move(tad),
                                               this,
                                               true);
    ATH_CHECK( m_pEventStore->addToStore (mclid, dp.release()) );
  }
  return StatusCode::SUCCESS;
}
 
StatusCode
MixingEventSelector::updateAddress(StoreID::type,SG::TransientAddress*,
                                   const EventContext&) {
  return StatusCode::FAILURE;
}
 
#undef FORWARD___DEBUG
 
unsigned long MixingEventSelector::getEventNo() const {
  return ( (m_eventNumbers.value().size() > m_eventPos) ?
       m_eventNumbers.value()[m_eventPos] :
       m_eventPos );      
}
 
//remember that m_pCurrentTrigger and m_trigList are mutable
MixingEventSelector::TriggerList::iterator 
MixingEventSelector::setCurrentTrigger() const { 
  //we look for the first trigger which is not done
  do {
    //if called before initialize, choose the last trigger in list
    unsigned int iTrig = (nullptr != m_chooseRangeRand) ?
      (unsigned int)(m_chooseRangeRand->fire() * double(m_trigList.todo())) :
      m_trigList.todo();
    m_pCurrentTrigger = m_trigList.elementInRange(iTrig);
  } while (validTrigger() && m_pCurrentTrigger->done() && 
       m_trigList.remove(m_pCurrentTrigger)); //remove a done trigger
 
  //printouts
  if (!validTrigger()) {
    ATH_MSG_INFO ("setCurrentTrigger: end of input");
  } else {
    ATH_MSG_DEBUG ("setCurrentTrigger: now using selector " 
           << currentTrigger()->name());
  }
 
  return m_pCurrentTrigger;
}
 
MixingEventSelector::TriggerList::iterator 
MixingEventSelector::currentTrigger() const { 
  return ( validTrigger() ? m_pCurrentTrigger : setCurrentTrigger() ); 
}
 
bool
MixingEventSelector::TriggerList::add(const Trigger& trig) {
  bool newElem(end() == find(begin(), end() , trig));
  if (newElem) {
    m_todo += trig.todo();
    m_trigs.push_back(trig);
    m_rangeEnd.push_back(m_todo);
#ifndef NDEBUG
    MsgStream log(Athena::getMessageSvc(), "MixingEventSelector::TriggerList");
    if (log.level() <= MSG::DEBUG) {
      log << MSG::DEBUG << "add: trigger " 
      << trig.name() << ". New trigger table: \n" << toString() <<endmsg;
    }
#endif
  }
  return newElem;
}
 
bool
MixingEventSelector::TriggerList::remove(iterator iTrig) {
  bool removed(false);
  unsigned int nElem(m_trigs.size());
  if (nElem) {
    unsigned int trigTodo(iTrig->todo());
    unsigned int trigIndex(iTrig - begin());
#ifndef NDEBUG
    string trigName(iTrig->name());
#endif
    m_trigs.erase(iTrig);
    removed = nElem > m_trigs.size();
    if (removed) {
      //this means we erased iTrig. Remove its todo count from total 
      m_todo -= trigTodo;
      //and from each of the subsequent ranges
      for (unsigned int i=trigIndex+1; i<m_rangeEnd.size(); ++i) 
    m_rangeEnd[i] -= trigTodo;
      //finally erase the corresponding rangeEnd element
      m_rangeEnd.erase(m_rangeEnd.begin()+trigIndex);
#ifndef NDEBUG
      MsgStream log(Athena::getMessageSvc(), "MixingEventSelector::TriggerList"); //FIXME
      if (log.level() <= MSG::DEBUG) {
    log << MSG::DEBUG << "remove: trigger " 
        << trigName
        << ". New trigger table: \n" << toString() <<endmsg;
      }
#endif
    }      
  }
  return removed;
}
 
string
MixingEventSelector::TriggerList::toString() const {
  ostringstream os;
  for (unsigned int i=0; i<m_trigs.size(); ++i) {
    //cant do    os << m_trigs[i].toString();
    os << m_trigs[i].name() << ", already read=" << m_trigs[i].read()
       << ", to do=" << m_trigs[i].todo() 
       << (m_trigs[i].done() ? " done " : " ") 
       << " -  endRange: " << m_rangeEnd[i] << '\n';
  }
  os << endl;
  return string(os.str()); 
}
 
MixingEventSelector::TriggerList::iterator 
MixingEventSelector::TriggerList::elementInRange(unsigned int i) {
  iterator iTrig(m_trigs.begin()), eTrig(m_trigs.end());
  std::vector<unsigned int>::const_iterator iRange(m_rangeEnd.begin());
  std::vector<unsigned int>::const_iterator eRange(m_rangeEnd.end());
  while (eRange != iRange && eTrig != iTrig && i > *iRange){
    ++iRange; ++iTrig;
  }
#ifndef NDEBUG
  MsgStream log(Athena::getMessageSvc(), "MixingEventSelector::TriggerList"); 
  if (log.level() <= MSG::VERBOSE) {
    if (eRange != iRange) log << MSG::VERBOSE 
                  << "elementInRange: rangeEnd=" << *iRange 
                  << " matches i=" << i << endmsg;
  }
#endif
  return iTrig;
}
 
MixingEventSelector::Trigger::Trigger(IEvtSelector* pSel,
                                      unsigned int firstEvt,
                                      unsigned int lastEvt): 
  m_pSelector(pSel), m_firstEvent(firstEvt), 
  m_toRead(lastEvt+1), m_todo(m_toRead-firstEvt), m_reads(0),
  m_current(nullptr)
  {   }
 
IEvtSelector::Context& MixingEventSelector::Trigger::currentContext() const {
  //make sure we have a context!
  if (nullptr == m_current) {
    IEvtSelector::Context* pTmp(nullptr);
    if ((createContext(pTmp)).isFailure()) 
      throw GaudiException("MixingEventSelector::Trigger::currentContext(): can't create context",
               name(),StatusCode::FAILURE);
  }
  // cppcheck-suppress nullPointerRedundantCheck; createContext() sets m_current
  return *m_current;
}
 
std::string
MixingEventSelector::Trigger::toString() const { 
  ostringstream os;
  os << name() << ", already read=" << m_reads 
     << ", to do=" << todo() << endl;
  return string(os.str()); 
}
 
StatusCode
MixingEventSelector::Trigger::next() const{
  StatusCode sc(StatusCode::FAILURE);
  if (!done()) {
    sc= selector().next(currentContext());
    while (sc.isSuccess() && (++m_reads < m_firstEvent))  
      sc = selector().next(currentContext());// m_reads, m_current are mutable
  }
  //  cout << "calling next on Trigger " << this << " " << dynamic_cast<IService&>(selector()).name() << endl;
  return sc;
}
 
StatusCode
MixingEventSelector::Trigger::previous() const{
  return selector().previous(currentContext());
}
 
StatusCode
MixingEventSelector::Trigger::createAddress(IOpaqueAddress*& pIOA) const {
  return (done() ? 
      StatusCode::FAILURE :
      selector().createAddress(currentContext(), pIOA) ); 
}
 
StatusCode
MixingEventSelector::Trigger::createContext(IEvtSelector::Context*& pCtxt) const{
  StatusCode sc(StatusCode::FAILURE);
  if (!done()) {
    sc = selector().createContext(pCtxt);
    m_current = pCtxt;
  }
  return sc;
}
 
bool 
MixingEventSelector::Trigger::done() const { 
  //  cout << "calling done on Trigger " << this << " " << dynamic_cast<IService&>(selector()).name() << endl;
  //  cout << refCtxt << " " << selector().end() << endl;
  //  cout << toRead() << " " << m_reads << endl;
  //  cout << "done returns " << ((m_current && (currentContext() == *selector().end())) || (toRead() <= m_reads)) << endl; 
  return  (toRead() <= m_reads);
}
 
 
StatusCode MixingEventSelector::last(IEvtSelector::Context&) const {
  return StatusCode::FAILURE;
}
StatusCode MixingEventSelector::next(IEvtSelector::Context&, int) const {
  return StatusCode::FAILURE;
}
StatusCode MixingEventSelector::previous(IEvtSelector::Context&) const {
  return StatusCode::FAILURE;
}
StatusCode MixingEventSelector::previous(IEvtSelector::Context&,int) const {
  return StatusCode::FAILURE;
}
StatusCode MixingEventSelector::rewind(IEvtSelector::Context&) const {
  return StatusCode::FAILURE;
}
StatusCode MixingEventSelector::releaseContext(IEvtSelector::Context*&) const {
  return  StatusCode::FAILURE;
}
StatusCode MixingEventSelector::resetCriteria(const std::string&,
                          IEvtSelector::Context&)const {
  return StatusCode::FAILURE;
}
 
 
// IConverter implementation.
const CLID& MixingEventSelector::objType() const
{
  static const CLID cid = ClassID_traits<EventInfo>::ID();  return cid;
}
long MixingEventSelector::repSvcType() const
{
  return 0;
}
 

StatusCode MixingEventSelector::createObj(IOpaqueAddress* /*pAddress*/,
                                          DataObject*& refpObject)
{
  const EventInfo* pEInfo(nullptr);
  if (!(m_pEventStore->retrieve(pEInfo)).isSuccess()) {
    ATH_MSG_ERROR 
      ("addMergedEventInfo: event store does not contain "\
       "an EventInfo object!");
    return StatusCode::RECOVERABLE;
  }
 
  // copy the original event to a new MergedEventInfo
  auto mei = std::make_unique<MergedEventInfo> (*pEInfo,
                                                m_outputRunNumber,
                                                getEventNo());
  refpObject = SG::asStorable (std::move (mei));
 
 
  //finally slam a new EventID in place of the old! HACK!!!  FIXME!!
  (const_cast<EventInfo*>(pEInfo))->setEventID(
                     new EventID(m_outputRunNumber, getEventNo()));
 
  return StatusCode::SUCCESS;
}
 
 
// IConverter dummies.
StatusCode MixingEventSelector::setDataProvider(IDataProviderSvc* /*pService*/)
{
  std::abort();
}
SmartIF<IDataProviderSvc>& MixingEventSelector::dataProvider() const
{
  std::abort();
}
StatusCode MixingEventSelector::setConversionSvc(IConversionSvc* /*pService*/)
{
  std::abort();
}
SmartIF<IConversionSvc>& MixingEventSelector::conversionSvc()    const
{
  std::abort();
}
StatusCode MixingEventSelector::setAddressCreator(IAddressCreator* /*creator*/)
{
  std::abort();
}
SmartIF<IAddressCreator>& MixingEventSelector::addressCreator()    const
{
  std::abort();
}
StatusCode MixingEventSelector::fillObjRefs(IOpaqueAddress* /*pAddress*/, DataObject* /*pObject*/)
{
  std::abort();
}
StatusCode MixingEventSelector::updateObj(IOpaqueAddress* /*pAddress*/, DataObject* /*refpObject*/)
{
  std::abort();
}
StatusCode MixingEventSelector::updateObjRefs(IOpaqueAddress* /*pAddress*/, DataObject* /*pObject*/)
{
  std::abort();
}
StatusCode MixingEventSelector::createRep(DataObject* /*pObject*/, IOpaqueAddress*& /*refpAddress*/)
{
  std::abort();
}
StatusCode MixingEventSelector::fillRepRefs(IOpaqueAddress* /*pAddress*/, DataObject* /*pObject*/)
{
  std::abort();
}
StatusCode MixingEventSelector::updateRep(IOpaqueAddress* /*pAddress*/, DataObject* /*pObject*/) 
{
  std::abort();
}
StatusCode MixingEventSelector::updateRepRefs(IOpaqueAddress* /*pAddress*/, DataObject* /*pObject*/)
{
  std::abort();
}