BaseDPLDigitizer.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 <DetectorsBase/BaseDPLDigitizer.h>
#include <SimConfig/DigiParams.h>
#include <DetectorsBase/GeometryManager.h>
#include <DataFormatsParameters/GRPObject.h>
#include <DetectorsBase/Propagator.h>
#include <fairlogger/Logger.h>
#include <TGeoGlobalMagField.h>
#include <TRandom.h>
 
using namespace o2::base;
 
BaseDPLDigitizer::BaseDPLDigitizer(InitServices::Type servicecode)
{
  mNeedGeom = servicecode & InitServices::GEOM;
  mNeedField = servicecode & InitServices::FIELD;
}
 
void BaseDPLDigitizer::init(o2::framework::InitContext& ic)
{
  // init basic stuff when this was asked for
  if (mNeedGeom) {
    LOG(info) << "Initializing geometry service";
    if (!gGeoManager) {
      o2::base::GeometryManager::loadGeometry(o2::conf::DigiParams::Instance().digitizationgeometry_prefix, true, true /* read from existing aligned file */);
    }
  }
 
  if (mNeedField) {
    if (TGeoGlobalMagField::Instance()->GetField() == nullptr) {
      LOG(info) << "Initializing field service";
      // load from GRP
      auto inputGRP = o2::conf::DigiParams::Instance().grpfile;
      if (inputGRP.empty()) {
        LOG(error) << "GRP filename not initialized in DigiParams";
      }
      auto grp = o2::parameters::GRPObject::loadFrom(inputGRP);
      if (!grp) {
        LOG(error) << "This workflow needs a valid GRP file to start";
      }
      // init magnetic field
      o2::base::Propagator::initFieldFromGRP(grp);
    } else {
      LOG(info) << "Field exists; Not reinitializing";
    }
  }
 
  // initialize the global ROOT random number generator (needed or not)
  LOG(info) << "Initializing ROOT digitizer random with seed " << o2::conf::DigiParams::Instance().seed;
  gRandom->SetSeed(o2::conf::DigiParams::Instance().seed);
 
  // finally call specific init
  this->initDigitizerTask(ic);
}