VertexReaderSpec.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 "Framework/ControlService.h"
#include "Framework/ConfigParamRegistry.h"
#include "Framework/Logger.h"
#include "ITSWorkflow/VertexReaderSpec.h"
#include "CommonUtils/NameConf.h"
 
using namespace o2::framework;
using namespace o2::its;
 
namespace o2
{
namespace its
{
 
void VertexReader::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>("its-vertex-infile"));
  connectTree(mFileName);
}
 
void VertexReader::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 " << mVerticesPtr->size() << " vertices in " << mVerticesROFRecPtr->size()
            << " ROFs at entry " << ent;
  pc.outputs().snapshot(Output{"ITS", "VERTICES", 0}, mVertices);
  pc.outputs().snapshot(Output{"ITS", "VERTICESROF", 0}, mVerticesROFRec);
 
  if (noEntry || mTree->GetReadEntry() + 1 >= mTree->GetEntries()) {
    pc.services().get<ControlService>().endOfStream();
    pc.services().get<ControlService>().readyToQuit(QuitRequest::Me);
  }
}
 
void VertexReader::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(mVertexTreeName.c_str()));
  assert(mTree);
  assert(mTree->GetBranch(mVertexBranchName.c_str()));
  assert(mTree->GetBranch(mVertexROFBranchName.c_str()));
  mTree->SetBranchAddress(mVertexBranchName.c_str(), &mVerticesPtr);
  mTree->SetBranchAddress(mVertexROFBranchName.c_str(), &mVerticesROFRecPtr);
  LOG(info) << "Loaded tree from " << filename << " with " << mTree->GetEntries() << " entries";
}
 
DataProcessorSpec getITSVertexReaderSpec()
{
  std::vector<OutputSpec> outputSpec;
  outputSpec.emplace_back("ITS", "VERTICES", 0, Lifetime::Timeframe);
  outputSpec.emplace_back("ITS", "VERTICESROF", 0, Lifetime::Timeframe);
 
  return DataProcessorSpec{
    "its-vertex-reader",
    Inputs{},
    outputSpec,
    AlgorithmSpec{adaptFromTask<VertexReader>()},
    Options{
      {"its-vertex-infile", VariantType::String, "o2trac_its.root", {"Name of the input ITS vertex file"}},
      {"input-dir", VariantType::String, "none", {"Input directory"}}}};
}
 
} // namespace its
} // namespace o2