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VMCSeederService.cxx
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53 lines (48 loc) · 2.05 KB
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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license 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 "DetectorsBase/VMCSeederService.h"
#include "TVirtualMC.h"
#include <fairlogger/Logger.h> // for FairLogger
#include <CommonUtils/ConfigurationMacroHelper.h> // for ROOT JIT helpers
using namespace o2::base;
void VMCSeederService::initSeederFunction(TVirtualMC const* vmc)
{
if (strcmp(vmc->GetName(), "TGeant3TGeo") == 0) {
// Geant3 doesn't need anything special in our context
mSeederFcn = []() {};
} else if (strcmp(vmc->GetName(), "TGeant4") == 0) {
// dynamically get access to the Geant4_VMC seeding function (without this function linking against Geant4)
std::string G4func("std::function<void()> G4func() { gSystem->Load(\"libgeant4vmc\"); return [](){ ((TGeant4*)TVirtualMC::GetMC())->SetRandomSeed(); };}");
mSeederFcn = o2::conf::JITAndEvalFunction<SeederFcn>(G4func, "G4func()", "std::function<void()>", "VMCSEEDERFUNC123");
} else {
LOG(warn) << "Unknown VMC engine or unimplemented VMC seeding function";
mSeederFcn = []() {};
}
}
// constructor
VMCSeederService::VMCSeederService()
{
auto vmc = TVirtualMC::GetMC();
if (vmc) {
LOG(info) << "Seeder initializing for " << vmc->GetName();
initSeederFunction(vmc);
} else {
LOG(fatal) << " Seeder could not be initialized (no VMC instance found)";
}
}
void VMCSeederService::setSeed() const
{
// Make sure gRandom is sufficiently well initialized
// by calling Rndm() once.
// This is ok since in any case gRandom->SetSeed(seed); gRandom->GetSeed() != seed;
gRandom->Rndm();
mSeederFcn();
}