MatchedMCHMIDReaderSpec.cxx

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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 <vector>
#include "TFile.h"
#include "TTree.h"
#include "Framework/Task.h"
#include "ReconstructionDataFormats/TrackMCHMID.h"
#include "SimulationDataFormat/MCCompLabel.h"
#include "Framework/ConfigParamRegistry.h"
#include "Framework/ControlService.h"
#include "GlobalTrackingWorkflowReaders/MatchedMCHMIDReaderSpec.h"
#include "DataFormatsParameters/GRPObject.h"
#include "Framework/SerializationMethods.h"
#include "CommonUtils/NameConf.h"
#include <fairlogger/Logger.h>
 
using namespace o2::framework;
using namespace o2::globaltracking;
 
namespace o2
{
namespace globaltracking
{
 
class MatchMCHMIDReader : public Task
{
 public:
  MatchMCHMIDReader(bool useMC) : mUseMC(useMC) {}
  ~MatchMCHMIDReader() override = default;
  void init(InitContext& ic) final;
  void run(ProcessingContext& pc) final;
 
 private:
  void connectTree(const std::string& filename);
  bool mUseMC = true;
  std::unique_ptr<TFile> mFile;
  std::unique_ptr<TTree> mTree;
  std::string mFileName = "";
  std::vector<o2::dataformats::TrackMCHMID> mTracks, *mTracksPtr = &mTracks;
  std::vector<o2::MCCompLabel> mLabels, *mLabelsPtr = &mLabels;
};
 
void MatchMCHMIDReader::init(InitContext& ic)
{
  mFileName = o2::utils::Str::concat_string(o2::utils::Str::rectifyDirectory(ic.options().get<std::string>("input-dir")),
                                            ic.options().get<std::string>("matchmchmid-track-infile"));
  connectTree(mFileName);
}
 
void MatchMCHMIDReader::run(ProcessingContext& pc)
{
  auto ent = mTree->GetReadEntry() + 1;
  // A timeframe holds no collision at all whenever the interaction rate is low enough, and
  // the tree then has no entry to read. Publish empty containers instead of reading past the
  // end and pushing branch addresses that GetEntry has not filled, so that the consumers
  // downstream still see the timeframe. (This used to be an assert, which is compiled out of
  // every production build since ENABLE_CASSERT defaults to OFF.)
  const bool noEntry = ent >= mTree->GetEntries();
  if (noEntry) {
    LOG(info) << "no entry to read, publishing empty output";
  } else {
    mTree->GetEntry(ent);
  }
  LOG(info) << "Pushing " << mTracks.size() << " MCHMID matches at entry " << ent;
 
  pc.outputs().snapshot(OutputRef{"muontracks"}, mTracks);
  if (mUseMC) {
    pc.outputs().snapshot(OutputRef{"muontracklabels"}, mLabels);
  }
 
  if (noEntry || mTree->GetReadEntry() + 1 >= mTree->GetEntries()) {
    pc.services().get<ControlService>().endOfStream();
    pc.services().get<ControlService>().readyToQuit(QuitRequest::Me);
  }
}
 
void MatchMCHMIDReader::connectTree(const std::string& filename)
{
  mTree.reset(nullptr); // in case it was already loaded
  mFile.reset(TFile::Open(filename.c_str()));
  assert(mFile && !mFile->IsZombie());
  mTree.reset((TTree*)mFile->Get("o2sim"));
  assert(mTree);
  mTree->SetBranchAddress("tracks", &mTracksPtr);
  if (mUseMC) {
    mTree->SetBranchAddress("tracklabels", &mLabelsPtr);
  }
  LOG(info) << "Loaded tree from " << filename << " with " << mTree->GetEntries() << " entries";
}
 
DataProcessorSpec getMCHMIDMatchedReaderSpec(bool useMC)
{
  std::vector<OutputSpec> outputs;
  outputs.emplace_back(OutputSpec{{"muontracks"}, "GLO", "MTC_MCHMID", 0, Lifetime::Timeframe});
  if (useMC) {
    outputs.emplace_back(OutputSpec{{"muontracklabels"}, "GLO", "MCMTC_MCHMID", 0, Lifetime::Timeframe});
  }
 
  return DataProcessorSpec{
    "mchmid-matches-reader",
    Inputs{},
    outputs,
    AlgorithmSpec{adaptFromTask<MatchMCHMIDReader>(useMC)},
    Options{
      {"matchmchmid-track-infile", VariantType::String, "muontracks.root", {"Name of the input file"}},
      {"input-dir", VariantType::String, "none", {"Input directory"}}}};
}
 
} // namespace globaltracking
} // namespace o2