AtDSFMTGenSvc.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "GaudiKernel/ISvcLocator.h"
#include "GaudiKernel/IIncidentSvc.h"
#include "GaudiKernel/Incident.h"
#include "GaudiKernel/DataIncident.h"
#include "GaudiKernel/ServiceHandle.h"
 
#include "interpretSeeds.h"
#include "AtDSFMTGenSvc.h"
#include "crc_combine.h"
 
#include "AtlasCLHEP_RandomGenerators/dSFMTEngine.h"
#include "CLHEP/Random/RandGauss.h"
 
#include <cassert>
#include <iostream>
 
/*FIXME temporarily needed for old seeding scheme*/
#include "StoreGate/tools/hash_functions.h" 
 
using namespace std;
 
AtDSFMTGenSvc::AtDSFMTGenSvc(const std::string& name,ISvcLocator* svc)
  : base_class(name,svc),
    m_reseedingOffsets(),
    m_engines(), m_engines_copy() {
    // Set Default values
    m_default_seed1               =        3591;
    m_default_seed2               =        2309736;
    m_PYTHIA_default_seed1        =        93453591;
    m_PYTHIA_default_seed2        =        73436;
    m_HERWIG_default_seed1        =        355391;
    m_HERWIG_default_seed2        =        97336;
}
 
 
AtDSFMTGenSvc::~AtDSFMTGenSvc()  
{
  engineIter i(m_engines.begin()), e(m_engines.end());
  while (i != e) delete (i++)->second;
}
 
StatusCode AtDSFMTGenSvc::initialize()
{
  ATH_MSG_INFO
    ("Initializing " << name() << "\n INITIALISING RANDOM NUMBER STREAMS. ");
 
  ServiceHandle<IIncidentSvc> pIncSvc("IncidentSvc", name());
 
  // set up the incident service:
  ATH_CHECK( pIncSvc.retrieve() );
 
  //start listening to "EndEvent"
  static const int PRIORITY = 100;
  pIncSvc->addListener(this, "EndEvent", PRIORITY);
  pIncSvc->addListener(this, "AfterReseedIncident", PRIORITY);
 
  //and to BeginEvent if we are reseeding
  if (m_eventReseed) {
      ATH_MSG_INFO ("will be reseeded for every event");
      pIncSvc->addListener(this, "BeginEvent", PRIORITY);
      pIncSvc->addListener(this, "ReseedIncident", PRIORITY);
  }
  pIncSvc.release().ignore();
 
  if (m_read_from_file) {
    // Read from a file
    ifstream infile( m_file_to_read.value().c_str() );
    if ( !infile ) {
      ATH_MSG_ERROR (" Unable to open: " << m_file_to_read.value());
      return StatusCode::FAILURE;
    } else {
      std::string buffer;
      while (std::getline(infile, buffer)) {
        string stream; 
        std::vector<uint32_t> seeds;
        //split the space-separated string in 3 words:
        if (interpretSeeds(buffer, stream, seeds)) {
          msg (MSG::DEBUG) 
            << " INITIALISING " << stream << " stream with seeds ";
          for (std::vector<uint32_t>::const_iterator i = seeds.begin(); i != seeds.end(); ++i){
            // The state returned is a set of 32-bit numbers.
            // On 64-bit platforms, though, the vector holds 64-bit ints.
            // For the first word, one gets garbage in the high 32 bits.
            // (This is because the crc32 routine used in clhep
            // to hash the engine names doesn't mask down to 32 bits.)
            // So mask off the garbage so that we get consistent results
            // across platforms.
            msg() << ((*i) & 0xffffffffu) << " ";
          }
          msg() << " read from file " << m_file_to_read.value() << endmsg;
          if (CreateStream(seeds, stream)) {
            msg(MSG::DEBUG)
              << stream << " stream initialized succesfully" <<endmsg;
          } else {
            msg(MSG::ERROR)
              << stream << " stream FAILED to initialize" <<endmsg;
            return StatusCode::FAILURE;
          }
        } else {                
          msg(MSG::ERROR)
            << "bad line\n" << buffer 
            << "\n in input file " << m_file_to_read.value() << endmsg;
          return StatusCode::FAILURE;
        }                
      }
      
    }
  }
  // Create the various streams according to user's request
  for (const auto& i : m_streams_seeds.value()) {
    string stream; 
    uint32_t seed1, seed2, offset(0);
    //parse the stream property string
    if (interpretSeeds(i, stream, seed1, seed2, offset)) {
      ATH_MSG_VERBOSE("Seeds property: stream " << stream 
                      << " seeds " << seed1 << ' ' << seed2 
                      << ", reseeding offset " << offset);
    } else {
      ATH_MSG_ERROR("bad Seeds property\n" << i);
      return StatusCode::FAILURE;
    }                
            
    // Check if stream already generated (e.g. from reading a file)
    bool not_found(true);
    if ( number_of_streams() != 0 ) {
      engineConstIter sf(begin());
      while (sf != end() && (not_found=((*sf).first != stream))) ++sf;
    }
        
    if (not_found) {
      ATH_MSG_DEBUG
        (" INITIALISING " << stream << " stream with seeds "
         << seed1 << "  " << seed2);
      CreateStream(seed1, seed2, stream);
      if (m_eventReseed) {
        m_reseedingOffsets.insert(std::make_pair(stream, offset));
        // apply the offset we just inserted
        ATH_MSG_DEBUG("Applying reseeding  offset " << offset << 
                      " to stream " << stream);
        this->setOnDefinedSeeds(seed1, seed2, stream);
      }
    }
    
  }
  return StatusCode::SUCCESS;
}
 
void AtDSFMTGenSvc::handle(const Incident &inc) {
  ATH_MSG_DEBUG (" Handle EndEvent ");
 
  if ( inc.type() == "EndEvent" ||
       inc.type() == "AfterReseedIncident" ) 
  {
    m_engines_copy.clear();
    engineConstIter iE(begin()), eE(end());
    while(iE != eE) {
      CLHEP::HepRandomEngine* engine = GetEngine(iE->first);
      std::vector<unsigned long> v = engine->put();
      std::vector<uint32_t> tseeds(v.size());
      for (size_t i=0; i<v.size(); ++i) {
        // The state returned is a set of 32-bit numbers.
        // On 64-bit platforms, though, the vector holds 64-bit ints.
        // For the first word, one gets garbage in the high 32 bits.
        // (This is because the crc32 routine used in clhep
        // to hash the engine names doesn't mask down to 32 bits.)
        // Mask off the garbage to get consistent results
        // across platforms.
        tseeds[i] = (v[i] & 0xffffffffu);
      }
      m_engines_copy.insert(std::make_pair(iE->first, tseeds));
      ++iE;
    }
    
    print();    
  } else if (inc.type() == "BeginEvent") {
    ATH_MSG_DEBUG (" Handle BeginEvent ");
    EventContext context = inc.context();
    const EventIDBase& ei = context.eventID();
    //clear static RandGauss cache (generates two numbers per call to shoot()
    CLHEP::RandGauss::setFlag(false);
    //loop over generator streams, combining the stream name to the hash
    vector<string>::const_iterator i(m_reseedStreamNames.begin());
    vector<string>::const_iterator e(m_reseedStreamNames.end());
    //by default (when no streams are specified in streamNames, seed all
    //streams
    if (i == e) {
      if (!(this->setAllOnDefinedSeeds(ei.event_number(), 
                                       ei.run_number())))
        throw GaudiException("can not reseed all streams ", name(), StatusCode::FAILURE);
    } else {
      while (i != e) {
        const string& strName(*i++);
        if (0 == this->setOnDefinedSeeds(ei.event_number(), 
                                         ei.run_number(),
                                         strName)) { 
          throw GaudiException(string("can not reseed stream ") + strName,  
                               name(), StatusCode::FAILURE);
        } else {
          msg() << MSG::VERBOSE << "Reseeded stream " << strName 
                << " for random service " << endmsg;
        }
      }
    }
  }
  else if (inc.type() == "ReseedIncident") {
    typedef ContextIncident<std::pair<unsigned,unsigned> > Ctxt;
    const Ctxt* incident = dynamic_cast<const Ctxt*>(&inc);
    if (!incident) {
      throw GaudiException(string("can not cast to ContextIncident "),
                           name(), StatusCode::FAILURE);
    }
    const std::pair<unsigned,unsigned>& data = incident->tag();
    //clear static RandGauss cache (generates two numbers per call to shoot()
    CLHEP::RandGauss::setFlag(false);
    //loop over generator streams, combining the stream name to the hash
    vector<string>::const_iterator i(m_reseedStreamNames.begin());
    vector<string>::const_iterator e(m_reseedStreamNames.end());
    //by default (when no streams are specified in streamNames, seed all
    //streams
    if (i == e) {
      if (!(this->setAllOnDefinedSeeds(data.first,
                       data.second)))
    throw GaudiException("can not reseed all streams ", name(), StatusCode::FAILURE);
    } else {
      while (i != e) {
    const string& strName(*i++);
    if (0 == this->setOnDefinedSeeds(data.first,
                     data.second,
                     strName)) {
      throw GaudiException(string("can not reseed stream ") + strName,
                   name(), StatusCode::FAILURE);
    } else {
      msg() << MSG::VERBOSE << "Reseeded stream " << strName
        << " for random service " << endmsg;
    }
      }
    }
  }
}
 
StatusCode AtDSFMTGenSvc::finalize()
{
  ATH_MSG_INFO (" FINALISING ");
 
  if (m_save_to_file) {
    // Write the status of the Service to file
    std::ofstream outfile( m_file_to_write.value().c_str() );
    if ( !outfile ) {
      ATH_MSG_ERROR ("error: unable to open: " << m_file_to_write.value());
    } else {
      for (std::map<std::string, std::vector<uint32_t> >::const_iterator i = m_engines_copy.begin();
           i != m_engines_copy.end();
           ++i) {
        outfile << (*i).first << " ";
        for (std::vector<uint32_t>::const_iterator j = (*i).second.begin(); j !=(*i).second.end(); ++j){
          outfile << (*j) << " ";
        }
        outfile << endl;
      }
      ATH_MSG_DEBUG (" wrote seeds to " << m_file_to_write.value() );
    }
  }
  return StatusCode::SUCCESS;
}
 
CLHEP::HepRandomEngine* AtDSFMTGenSvc::GetEngine        ( const std::string& streamName )
{
    engineConstIter citer = m_engines.find(streamName);
    if ( citer == m_engines.end() )
    {
        m_engines.insert( engineValType( streamName, new CLHEP::dSFMTEngine() ) );
        SetStreamSeeds( streamName );
    }
    
    engineIter iter = m_engines.find(streamName);
    return (CLHEP::HepRandomEngine*)(*iter).second;
}
 
void AtDSFMTGenSvc::CreateStream(uint32_t seed1, uint32_t seed2, const std::string& streamName )
{
    long seeds[3] = { (long)seed1, (long)seed2, 0 };
    const long* s = seeds;
    engineConstIter citer = m_engines.find(streamName);
    if ( citer == m_engines.end() ) 
      m_engines.insert(engineValType(streamName, new CLHEP::dSFMTEngine(s)));
    engineIter iter = m_engines.find(streamName);
    ((*iter).second)->setSeeds(s, 0);
}
 
bool AtDSFMTGenSvc::CreateStream(const std::vector<uint32_t>& seeds, const std::string& streamName)
{
    engineConstIter citer = m_engines.find(streamName);
    if ( citer == m_engines.end() ) m_engines.insert(engineValType(streamName, new CLHEP::dSFMTEngine() ) );
    engineIter iter = m_engines.find(streamName);
    std::vector<unsigned long> longSeeds(seeds.size());
    for (size_t i=0; i<seeds.size(); ++i) longSeeds[i]=seeds[i];
    return (((*iter).second)->getState( longSeeds ));
}
 
void AtDSFMTGenSvc::SetStreamSeeds( const std::string& StreamName )
{
    uint32_t seed1;
    uint32_t seed2;
    if (StreamName == "PYTHIA")
    {
        seed1 = m_PYTHIA_default_seed1;
        seed2 = m_PYTHIA_default_seed2;
    }
    else if (StreamName == "HERWIG")
    {
        seed1 = m_HERWIG_default_seed1;
        seed2 = m_HERWIG_default_seed2;
    }
    else
    {
        seed1 = m_default_seed1;
        seed2 = m_default_seed2;
    }
    ATH_MSG_WARNING
      (" INITIALISING " << StreamName << " stream with DEFAULT seeds "
       << seed1 << "  " << seed2);
    
    long seeds[3] = { (long)seed1, (long)seed2, 0 };
    const long* s = seeds;
    engineIter iter = m_engines.find(StreamName);
    ((*iter).second)->setSeeds(s,0);
}
 
void AtDSFMTGenSvc::print(const std::string& StreamName )
{
    engineConstIter citer = m_engines.find(StreamName);
    if ( citer == m_engines.end() ) {
      ATH_MSG_WARNING (" Stream =  " << StreamName << " NOT FOUND");
    } else {
      std::vector<unsigned long> v = ((*citer).second)->put();
      msg(MSG::DEBUG) << " Stream =  " << StreamName << " ";
      for (std::vector<unsigned long>::const_iterator i = v.begin(); i != v.end(); ++i){
        // The state returned is a set of 32-bit numbers.
        // On 64-bit platforms, though, the vector holds 64-bit ints.
        // For the first word, one gets garbage in the high 32 bits.
        // (This is because the crc32 routine used in clhep
        // to hash the engine names doesn't mask down to 32 bits.)
        // So mask off the garbage so that we get consistent results
        // across platforms.
        msg() << ((*i) & 0xffffffffu) << " ";
      }
      msg() << endmsg;
    }
}
 
void AtDSFMTGenSvc::print        ( void )
{
    for (engineConstIter i = m_engines.begin(); i != m_engines.end(); ++i)
        print( (*i).first );
}
 
CLHEP::HepRandomEngine* AtDSFMTGenSvc::setOnDefinedSeeds(uint32_t eventNumber, uint32_t runNumber,
                                                  const std::string& streamName)
{
  uint32_t theHash(eventNumber);
  map<string, uint32_t>::const_iterator citer(m_reseedingOffsets.find(streamName));
  bool hasOffset(citer != m_reseedingOffsets.end() && 0 != citer->second);
  if (hasOffset) theHash=crc_combine(theHash, citer->second);
 
  theHash=crc_combine(theHash, runNumber);
  ATH_MSG_VERBOSE( "Reseeding stream " << streamName 
                   << " with eventNumber " << eventNumber 
                   << " runNumber " << runNumber);
  if (hasOffset) ATH_MSG_VERBOSE("Applied offset " <<  citer->second);
  return this->setOnDefinedSeeds(theHash, streamName);
}
 
CLHEP::HepRandomEngine* AtDSFMTGenSvc::setOnDefinedSeeds(uint32_t theSeed, 
                                                  const std::string& streamName){
  engineConstIter citer = m_engines.find(streamName);
  if ( citer == m_engines.end() ) 
    m_engines.insert(engineValType(streamName, new CLHEP::dSFMTEngine() ) );
 
  engineIter iter = m_engines.find(streamName);
  theSeed=crc_combine(theSeed, streamName);
  ATH_MSG_DEBUG("Reseeding stream " << streamName << " with " << theSeed);
  CLHEP::HepRandomEngine* eng = (*iter).second;
  eng->setSeed( theSeed, 0 );
  return eng;
}
 
bool
AtDSFMTGenSvc::setAllOnDefinedSeeds(uint32_t eventNumber, uint32_t runNumber)
{
  bool allOK(true);
  engineIter i(m_engines.begin()), e(m_engines.end());
  while (i!=e && 
         (allOK=(0 != this->setOnDefinedSeeds(eventNumber,
                                              runNumber,
                                              (*i++).first)))) {
    /*empty*/
  }
    
  return allOK;
}
 
bool
AtDSFMTGenSvc::setAllOnDefinedSeeds(uint32_t theSeed){
  bool allOK(true);
  engineIter i(m_engines.begin()), e(m_engines.end());
  while (i!=e && 
         (allOK=(0 != this->setOnDefinedSeeds(theSeed, (*i++).first)))) {
    /*empty*/
  }
  return allOK;
}