DTTTrigOffsetCalibration.cc

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/*
 *  See header file for a description of this class.
 *
 *  \author A. Vilela Pereira
 */

#include "DTTTrigOffsetCalibration.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include "Geometry/DTGeometry/interface/DTGeometry.h"
#include "Geometry/Records/interface/MuonGeometryRecord.h"

#include "DataFormats/DTRecHit/interface/DTRecSegment4DCollection.h"
#include "CondFormats/DTObjects/interface/DTTtrig.h"
#include "CondFormats/DataRecord/interface/DTTtrigRcd.h"
#include "CondFormats/DataRecord/interface/DTStatusFlagRcd.h"
#include "CondFormats/DTObjects/interface/DTStatusFlag.h"

#include "CalibMuon/DTCalibration/interface/DTCalibDBUtils.h"
#include "CalibMuon/DTCalibration/interface/DTSegmentSelector.h"

#include <string>
#include <sstream>
#include "TFile.h"
#include "TH1F.h"

using namespace std;
using namespace edm;

DTTTrigOffsetCalibration::DTTTrigOffsetCalibration(const ParameterSet& pset):
  select_(pset),
  theRecHits4DLabel_(pset.getParameter<InputTag>("recHits4DLabel")),
  doTTrigCorrection_(pset.getUntrackedParameter<bool>("doT0SegCorrection", false)),
  theCalibChamber_(pset.getUntrackedParameter<string>("calibChamber", "All")),
  dbLabel_(pset.getUntrackedParameter<string>("dbLabel", "")) {

  LogVerbatim("Calibration") << "[DTTTrigOffsetCalibration] Constructor called!";

  // the root file which will contain the histos
  string rootFileName = pset.getUntrackedParameter<string>("rootFileName","DTT0SegHistos.root");
  rootFile_ = new TFile(rootFileName.c_str(), "RECREATE");
  rootFile_->cd();
}

void DTTTrigOffsetCalibration::beginRun(const edm::Run& run, const edm::EventSetup& setup) {
  if(doTTrigCorrection_){
    ESHandle<DTTtrig> tTrig;
    setup.get<DTTtrigRcd>().get(dbLabel_,tTrig);
    tTrigMap_ = &*tTrig;
    LogVerbatim("Calibration") << "[DTTTrigOffsetCalibration]: TTrig version: " << tTrig->version() << endl; 
  }
}

DTTTrigOffsetCalibration::~DTTTrigOffsetCalibration(){
  rootFile_->Close();
  LogVerbatim("Calibration") << "[DTTTrigOffsetCalibration] Destructor called!";
}

void DTTTrigOffsetCalibration::analyze(const Event & event, const EventSetup& eventSetup) {
  rootFile_->cd();
  DTChamberId chosenChamberId;

  if(theCalibChamber_ != "All") {
    stringstream linestr;
    int selWheel, selStation, selSector;
    linestr << theCalibChamber_;
    linestr >> selWheel >> selStation >> selSector;
    chosenChamberId = DTChamberId(selWheel, selStation, selSector);
    LogVerbatim("Calibration") << " chosen chamber " << chosenChamberId << endl;
  }

  // Get the DT Geometry
  ESHandle<DTGeometry> dtGeom;
  eventSetup.get<MuonGeometryRecord>().get(dtGeom);

  // Get the rechit collection from the event
  Handle<DTRecSegment4DCollection> all4DSegments;
  event.getByLabel(theRecHits4DLabel_, all4DSegments); 

  // Loop over segments by chamber
  DTRecSegment4DCollection::id_iterator chamberIdIt;
  for(chamberIdIt = all4DSegments->id_begin(); chamberIdIt != all4DSegments->id_end(); ++chamberIdIt){

    // Get the chamber from the setup
    const DTChamber* chamber = dtGeom->chamber(*chamberIdIt);
    LogTrace("Calibration") << "Chamber Id: " << *chamberIdIt;

    // Book histos
    if(theT0SegHistoMap_.find(*chamberIdIt) == theT0SegHistoMap_.end()){
      bookHistos(*chamberIdIt);
    }
   
    // Calibrate just the chosen chamber/s    
    if((theCalibChamber_ != "All") && ((*chamberIdIt) != chosenChamberId)) continue;

    // Get the range for the corresponding ChamberId
    DTRecSegment4DCollection::range range = all4DSegments->get((*chamberIdIt));

    // Loop over the rechits of this DetUnit
    for(DTRecSegment4DCollection::const_iterator segment  = range.first;
                                                 segment != range.second; ++segment){

      LogTrace("Calibration") << "Segment local pos (in chamber RF): " << (*segment).localPosition()
                              << "\nSegment global pos: " << chamber->toGlobal((*segment).localPosition());
      
      if( !select_(*segment, event, eventSetup) ) continue;

      // Fill t0-seg values
      if( (*segment).hasPhi() ) {
        //if( segment->phiSegment()->ist0Valid() ){ 
    if( (segment->phiSegment()->t0()) != 0.00 ){
      (theT0SegHistoMap_[*chamberIdIt])[0]->Fill(segment->phiSegment()->t0());
    }
      }
      if( (*segment).hasZed() ){
        //if( segment->zSegment()->ist0Valid() ){ 
        if( (segment->zSegment()->t0()) != 0.00 ){
      (theT0SegHistoMap_[*chamberIdIt])[1]->Fill(segment->zSegment()->t0());
    }
      }
    } // DTRecSegment4DCollection::const_iterator segment
  } // DTRecSegment4DCollection::id_iterator chamberIdIt
} // DTTTrigOffsetCalibration::analyze

void DTTTrigOffsetCalibration::endJob() {
  rootFile_->cd();
  
  LogVerbatim("Calibration") << "[DTTTrigOffsetCalibration] Writing histos to file!" << endl;

  for(ChamberHistosMap::const_iterator itChHistos = theT0SegHistoMap_.begin(); itChHistos != theT0SegHistoMap_.end(); ++itChHistos){
    for(vector<TH1F*>::const_iterator itHist = (*itChHistos).second.begin();
                                      itHist != (*itChHistos).second.end(); ++itHist) (*itHist)->Write();
  }

  if(doTTrigCorrection_){
    // Create the object to be written to DB
    DTTtrig* tTrig = new DTTtrig();

    for(ChamberHistosMap::const_iterator itChHistos = theT0SegHistoMap_.begin(); itChHistos != theT0SegHistoMap_.end(); ++itChHistos){
      DTChamberId chId = itChHistos->first;
      // Get SuperLayerId's for each ChamberId
      vector<DTSuperLayerId> slIds;
      slIds.push_back(DTSuperLayerId(chId,1));
      slIds.push_back(DTSuperLayerId(chId,3));
      if(chId.station() != 4) slIds.push_back(DTSuperLayerId(chId,2));

      for(vector<DTSuperLayerId>::const_iterator itSl = slIds.begin(); itSl != slIds.end(); ++itSl){      
        // Get old values from DB
        float ttrigMean = 0;
        float ttrigSigma = 0;
    float kFactor = 0;
        tTrigMap_->get(*itSl,ttrigMean,ttrigSigma,kFactor,DTTimeUnits::ns);
        //FIXME: verify if values make sense
        // Set new values
        float ttrigMeanNew = ttrigMean;
        float ttrigSigmaNew = ttrigSigma;
    float t0SegMean = (itSl->superLayer() != 2)?itChHistos->second[0]->GetMean():itChHistos->second[1]->GetMean();

    float kFactorNew = (kFactor*ttrigSigma+t0SegMean)/ttrigSigma;

        tTrig->set(*itSl,ttrigMeanNew,ttrigSigmaNew,kFactorNew,DTTimeUnits::ns);
      }
    }
    LogVerbatim("Calibration")<< "[DTTTrigOffsetCalibration] Writing ttrig object to DB!" << endl;
    // Write the object to DB
    string tTrigRecord = "DTTtrigRcd";
    DTCalibDBUtils::writeToDB(tTrigRecord, tTrig);
  } 
}

// Book a set of histograms for a given Chamber
void DTTTrigOffsetCalibration::bookHistos(DTChamberId chId) {

  LogTrace("Calibration") << "   Booking histos for Chamber: " << chId;

  // Compose the chamber name
  std::string wheel = std::to_string(chId.wheel());
  std::string station = std::to_string(chId.station());
  std::string sector = std::to_string(chId.sector());

  string chHistoName =
    "_W" + wheel +
    "_St" + station +
    "_Sec" +  sector;

  vector<TH1F*> histos;
  // Note the order matters
  histos.push_back(new TH1F(("hRPhiSegT0"+chHistoName).c_str(), "t0 from Phi segments", 500, -60., 60.));
  if(chId.station() != 4) histos.push_back(new TH1F(("hRZSegT0"+chHistoName).c_str(), "t0 from Z segments", 500, -60., 60.));

  theT0SegHistoMap_[chId] = histos;
}