DigitReaderSpec.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 <TTree.h>
#include "Framework/ConfigParamRegistry.h"
#include "Framework/ControlService.h"
#include "Framework/Logger.h"
#include "FT0Workflow/DigitReaderSpec.h"
#include "DataFormatsFT0/Digit.h"
#include "DataFormatsFT0/ChannelData.h"
#include "DataFormatsFT0/MCLabel.h"
#include "SimulationDataFormat/MCTruthContainer.h"
#include "CommonUtils/NameConf.h"
 
using namespace o2::framework;
 
namespace o2
{
namespace ft0
{
 
void DigitReader::init(InitContext& ic)
{
  auto filename = o2::utils::Str::concat_string(o2::utils::Str::rectifyDirectory(ic.options().get<std::string>("input-dir")),
                                                ic.options().get<std::string>("ft0-digit-infile"));
  mFile.reset(TFile::Open(filename.c_str()));
  if (!mFile->IsOpen()) {
    LOG(error) << "Cannot open the " << filename.c_str() << " file !";
    throw std::runtime_error("cannot open input digits file");
  }
  mTree.reset((TTree*)mFile->Get("o2sim"));
  if (!mTree) {
    LOG(error) << "Did not find o2sim tree in " << filename.c_str();
    throw std::runtime_error("Did not fine o2sim file in FT0 digits tree");
  }
}
 
void DigitReader::run(ProcessingContext& pc)
{
  std::vector<o2::ft0::Digit> digits, *pdigits = &digits;
  std::vector<o2::ft0::DetTrigInput> trgInput, *ptrTrgInput = &trgInput;
  std::vector<o2::ft0::ChannelData> channels, *pchannels = &channels;
  mTree->SetBranchAddress("FT0DIGITSBC", &pdigits);
  mTree->SetBranchAddress("FT0DIGITSCH", &pchannels);
  if (mUseTrgInput) {
    mTree->SetBranchAddress("TRIGGERINPUT", &ptrTrgInput);
  }
  o2::dataformats::MCTruthContainer<o2::ft0::MCLabel> labels, *plabels = &labels;
  if (mUseMC) {
    mTree->SetBranchAddress("FT0DIGITSMCTR", &plabels);
  }
  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(debug) << "FT0DigitReader pushed " << channels.size() << " channels in " << digits.size() << " digits";
  pc.outputs().snapshot(Output{"FT0", "DIGITSBC", 0}, digits);
  pc.outputs().snapshot(Output{"FT0", "DIGITSCH", 0}, channels);
  if (mUseMC) {
    pc.outputs().snapshot(Output{"FT0", "DIGITSMCTR", 0}, labels);
  }
  if (mUseTrgInput) {
    pc.outputs().snapshot(Output{"FT0", "TRIGGERINPUT", 0}, trgInput);
  }
  if (noEntry || mTree->GetReadEntry() + 1 >= mTree->GetEntries()) {
    pc.services().get<ControlService>().endOfStream();
    pc.services().get<ControlService>().readyToQuit(QuitRequest::Me);
  }
}
 
DataProcessorSpec getDigitReaderSpec(bool useMC, bool useTrgInput)
{
  std::vector<OutputSpec> outputs;
  outputs.emplace_back("FT0", "DIGITSBC", 0, Lifetime::Timeframe);
  outputs.emplace_back("FT0", "DIGITSCH", 0, Lifetime::Timeframe);
  if (useMC) {
    outputs.emplace_back("FT0", "DIGITSMCTR", 0, Lifetime::Timeframe);
  }
  if (useTrgInput) {
    outputs.emplace_back("FT0", "TRIGGERINPUT", 0, Lifetime::Timeframe);
  }
  return DataProcessorSpec{
    "ft0-digit-reader",
    Inputs{},
    outputs,
    AlgorithmSpec{adaptFromTask<DigitReader>(useMC, useTrgInput)},
    Options{
      {"ft0-digit-infile", VariantType::String, "ft0digits.root", {"Name of the input file"}},
      {"input-dir", VariantType::String, "none", {"Input directory"}}}};
}
 
} // namespace ft0
} // namespace o2