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New generator GeneratorTParticle
The generator `GeneratorTParticle` will read in particles from a `TChain` containing a branch with a `TClonesArray` of `TParticle` objects. The generator can operate in two modes - Data is read from a file(s) - Data is read from a file being generated by a child program The first mode is selected by -g tparticle --configKeyValues "TParticle.fileNames=foo.root,bar.root" The second mode is selected by -g tparticle --configKeyValues "TParticle.progCmd=<program and options>" For this latter mode, see also recent commit to `GeneratorHepMC` Above `<program and options>` specifiy a program to spawn in the background which will write to a specified file (temporary file). Suppose the program is called `eg`, then the following _must_ be possible eg -n NEVENTS -o OUTPUT_FILENAME That is, `eg` _must_ accept the option `-n` to set the number of events to produce, and the option `-o` to set the output file name (a ROOT file). The name of the `TTree` object in the file(s) can be set with --configKeyValues "TParticle.treeName=<name>" (defaults to `T`), and similar for the branch that contains the `TClonesArray` of `TParticle` --configKeyValues "TParticle.branchName=<name>" (defaults to `Particles`). The generator `GeneratorTParticle` _does not_ import any header information into the simulation event record. Some proper convention could be decided upon, e.g., one that tracks the HepMC event record format.
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‎Generators/CMakeLists.txt‎

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@@ -38,6 +38,8 @@ o2_add_library(Generators
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src/GenCosmicsParam.cxx
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src/GeneratorFactory.cxx
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src/GeneratorGeantinos.cxx
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src/GeneratorTParticle.cxx
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src/GeneratorTParticleParam.cxx
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$<$<BOOL:${pythia6_FOUND}>:src/GeneratorPythia6.cxx>
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$<$<BOOL:${pythia6_FOUND}>:src/GeneratorPythia6Param.cxx>
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$<$<BOOL:${pythia_FOUND}>:src/GeneratorPythia8.cxx>
@@ -79,6 +81,8 @@ set(headers
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include/Generators/QEDGenParam.h
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include/Generators/GenCosmicsParam.h
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include/Generators/GeneratorGeantinos.h
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include/Generators/GeneratorTParticle.h
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include/Generators/GeneratorTParticleParam.h
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)
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if (pythia6_FOUND)

‎Generators/include/Generators/GeneratorTParticle.h‎

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// -*- C++ -*-
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// Copyright 2023 CERN and copyright holders of ALICE O2.
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//
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// See https://alice-o2.web.cern.ch/copyright for details of the
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// copyright holders. All rights not expressly granted are reserved.
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//
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// This software is distributed under the terms of the GNU General
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// Public License v3 (GPL Version 3), copied verbatim in the file
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// "COPYING".
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//
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// In applying this license CERN does not waive the privileges and
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// immunities granted to it by virtue of its status as an
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// Intergovernmental Organization or submit itself to any
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// jurisdiction.
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//
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/// @author: Christian Holm Christensen <cholm@nbi.dk>
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#ifndef ALICEO2_GENERATORTPARTICLE_H_
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#define ALICEO2_GENERATORTPARTICLE_H_
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#include <FairGenerator.h>
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#include <Generators/Generator.h>
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#include <list>
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// Forward decls
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class TChain;
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class TParticle;
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class TClonesArray;
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namespace o2
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{
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namespace eventgen
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{
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/// A class that reads in particles of class @c TParticle from a
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/// branch in a @c TChain.
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///
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/// Optionally, a program that generates such a @c TTree can be
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/// spawn, and the @c TParticles written to a file from which this
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/// object reads them in. This is done with
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///
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/// --configKeyValues "TParticle.progCmd=<eg program and options>"
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///
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/// which will execute the specified EG program with the given
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/// options. The EG program _must_ support the command line options
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///
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/// -n NUMBER Number of events to generate
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/// -o FILENAME Name of file to write to
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///
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/// The tree name and particle branch names can be configured.
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///
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/// --configKeyValues "TParticle.treeName=T,TParticle.branchName=P"
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///
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/// File(s) to read are also configurable
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///
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/// --configKeyValues "TParticle.fileNames=foo.root,bar.root"
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///
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class GeneratorTParticle : public Generator
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{
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public:
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/** CTOR */
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GeneratorTParticle() = default;
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/** CTOR */
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GeneratorTParticle(const std::string& name)
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: Generator(name.c_str(),"ALICEo2 TParticle Generator")
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{}
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/** DTOR */
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virtual ~GeneratorTParticle();
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/** Initialize this generator. This will set up the chain.
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Optionally, if a command line was specified by @c
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TParticle.progCmd then that command line is executed in the
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background and events are read from the output file of that
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program */
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Bool_t Init() override;
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/** Read in the next entry from the chain. Returns false in
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case of errors or no more entries to read. */
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Bool_t generateEvent() override;
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/** Import the read-in particles into the steer particle
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stack */
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Bool_t importParticles() override;
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/** Set the names of files to read, separated by commas */
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void setFileNames(const std::string& val);
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/** Set the name of the tree in the files. The tree _must_
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reside in the top-level directory of the files. */
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void setTreeName(const std::string& val) { mTreeName = val; }
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/** Set the branch name of the branch that holds a @c
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TClonesArray of @c TParticle objects */
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void setBranchName(const std::string& val) { mBranchName = val; }
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/** Set child program command line to (optionally) execute */
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void setProgCmd(const std::string& val) { mProgCmd = val; }
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/** Set the number of events to generate. */
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void setNEvents(unsigned int nev) { mNEvents = nev; }
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protected:
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std::string mTreeName = "T";
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std::string mBranchName = "Particles";
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std::string mProgCmd = "";
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std::list<std::string> mFileNames;
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unsigned int mNEvents = 0;
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unsigned int mEntry = 0;
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TChain* mChain;
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TClonesArray* mTParticles;
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void waitForData();
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ClassDefOverride(GeneratorTParticle,1);
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};
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}
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}
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#endif
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//
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// EOF
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//
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‎Generators/include/Generators/GeneratorTParticleParam.h‎

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
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//
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// See https://alice-o2.web.cern.ch/copyright for details of the
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// copyright holders. All rights not expressly granted are reserved.
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//
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// This software is distributed under the terms of the GNU General
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// Public License v3 (GPL Version 3), copied verbatim in the file
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// "COPYING".
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//
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// In applying this license CERN does not waive the privileges and
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// immunities granted to it by virtue of its status as an
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// Intergovernmental Organization or submit itself to any
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// jurisdiction.
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//
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// @author: Christian Holm Christensen <cholm@nbi.dk>
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#ifndef ALICEO2_EVENTGEN_GENERATORTPARTICLEPARAM_H_
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#define ALICEO2_EVENTGEN_GENERATORTPARTICLEPARAM_H_
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#include "CommonUtils/ConfigurableParam.h"
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#include "CommonUtils/ConfigurableParamHelper.h"
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#include <string>
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namespace o2
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{
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namespace eventgen
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{
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/**
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a parameter class/struct to keep the settings of the TGenerator
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event generator and allow the user to modify them */
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struct GeneratorTParticleParam :
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public o2::conf::ConfigurableParamHelper<GeneratorTParticleParam>
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{
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std::string treeName = "T";
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std::string branchName = "Particles";
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std::string fileNames = "tparticle.root";
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std::string progCmd = "";
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O2ParamDef(GeneratorTParticleParam, "TParticle");
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};
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} // end namespace eventgen
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} // end namespace o2
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#endif // ALICEO2_EVENTGEN_GENERATORHEPMCPARAM_H_

‎Generators/src/GeneratorFactory.cxx‎

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#include <fairlogger/Logger.h>
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#include <SimConfig/SimConfig.h>
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#include <Generators/GeneratorFromFile.h>
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#include <Generators/GeneratorTParticle.h>
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#include <Generators/GeneratorTParticleParam.h>
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#ifdef GENERATORS_WITH_PYTHIA6
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#include <Generators/GeneratorPythia6.h>
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#include <Generators/GeneratorPythia6Param.h>
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o2::O2DatabasePDG::addALICEParticles(TDatabasePDG::Instance());
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auto genconfig = conf.getGenerator();
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LOG(info) << "** Generator to use: '" << genconfig << "'";
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if (genconfig.compare("boxgen") == 0) {
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// a simple "box" generator configurable via BoxGunparam
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auto& boxparam = BoxGunParam::Instance();
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if (o2PrimGen) {
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o2PrimGen->setApplyVertex(false);
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}
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}
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LOG(info) << "using external O2 kinematics";
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} LOG(info) << "using external O2 kinematics";
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} else if (genconfig.compare("tparticle") == 0) {
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// External ROOT file(s) with tree of TParticle in clones array,
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// or external program generating such a file
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auto& param = GeneratorTParticleParam::Instance();
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LOG(info) << "Init 'GeneratorTParticle' with the following parameters";
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LOG(info) << param;
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auto tgen = new o2::eventgen::GeneratorTParticle();
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tgen->setFileNames(param.fileNames);
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tgen->setProgCmd(param.progCmd);
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tgen->setTreeName(param.treeName);
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tgen->setBranchName(param.branchName);
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tgen->setNEvents(conf.getNEvents());
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primGen->AddGenerator(tgen);
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#ifdef GENERATORS_WITH_HEPMC3
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} else if (genconfig.compare("hepmc") == 0) {
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// external HepMC file
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// external HepMC file, or external program writing HepMC event
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// records to standard output.
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auto& param = GeneratorHepMCParam::Instance();
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LOG(info) << "Init \'GeneratorHepMC\' with following parameters";
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LOG(info) << param;
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auto hepmcGen = new o2::eventgen::GeneratorHepMC();
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hepmcGen->setFileName(param.fileName);
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hepmcGen->setProgCmd(param.progCmd);
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hepmcGen->setVersion(param.version);
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hepmcGen->setEventsToSkip(param.eventsToSkip);
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hepmcGen->setNEvents(conf.getNEvents());
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primGen->AddGenerator(hepmcGen);
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#endif
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#ifdef GENERATORS_WITH_PYTHIA6

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