CTPPSPixelLocalTrackProducer.cc

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#include "FWCore/Framework/interface/MakerMacros.h"

#include "DataFormats/Common/interface/DetSetVector.h"
#include "DataFormats/Common/interface/DetSet.h"
#include "FWCore/Framework/interface/stream/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"

#include "FWCore/Framework/interface/ESWatcher.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/Utilities/interface/ESGetToken.h"

#include "Geometry/Records/interface/VeryForwardRealGeometryRecord.h"

#include "DataFormats/CTPPSReco/interface/CTPPSPixelRecHit.h"
#include "DataFormats/CTPPSReco/interface/CTPPSPixelLocalTrack.h"
#include "DataFormats/DetId/interface/DetId.h"

#include "RecoPPS/Local/interface/RPixDetPatternFinder.h"
#include "RecoPPS/Local/interface/RPixDetTrackFinder.h"

#include <memory>

#include <string>
#include <vector>

#include "FWCore/Framework/interface/Frameworkfwd.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "DataFormats/CTPPSDetId/interface/CTPPSPixelDetId.h"

#include "RecoPPS/Local/interface/RPixRoadFinder.h"
#include "RecoPPS/Local/interface/RPixPlaneCombinatoryTracking.h"

class CTPPSPixelLocalTrackProducer : public edm::stream::EDProducer<> {
public:
  explicit CTPPSPixelLocalTrackProducer(const edm::ParameterSet &parameterSet);

  ~CTPPSPixelLocalTrackProducer() override;

  void produce(edm::Event &, const edm::EventSetup &) override;
  static void fillDescriptions(edm::ConfigurationDescriptions &descriptions);

private:
  int verbosity_;
  int maxHitPerPlane_;
  int maxHitPerRomanPot_;
  int maxTrackPerRomanPot_;
  int maxTrackPerPattern_;

  edm::InputTag inputTag_;
  edm::EDGetTokenT<edm::DetSetVector<CTPPSPixelRecHit>> tokenCTPPSPixelRecHit_;
  edm::ESGetToken<CTPPSGeometry, VeryForwardRealGeometryRecord> tokenCTPPSGeometry_;
  edm::ESWatcher<VeryForwardRealGeometryRecord> geometryWatcher_;
  uint32_t numberOfPlanesPerPot_;
  std::vector<uint32_t> listOfAllPlanes_;

  std::unique_ptr<RPixDetPatternFinder> patternFinder_;
  std::unique_ptr<RPixDetTrackFinder> trackFinder_;

  void run(const edm::DetSetVector<CTPPSPixelRecHit> &input, edm::DetSetVector<CTPPSPixelLocalTrack> &output);
};

//------------------------------------------------------------------------------------------------//

CTPPSPixelLocalTrackProducer::CTPPSPixelLocalTrackProducer(const edm::ParameterSet &parameterSet) {
  inputTag_ = parameterSet.getParameter<edm::InputTag>("tag");
  verbosity_ = parameterSet.getUntrackedParameter<int>("verbosity");
  maxHitPerRomanPot_ = parameterSet.getParameter<int>("maxHitPerRomanPot");
  maxHitPerPlane_ = parameterSet.getParameter<int>("maxHitPerPlane");
  maxTrackPerRomanPot_ = parameterSet.getParameter<int>("maxTrackPerRomanPot");
  maxTrackPerPattern_ = parameterSet.getParameter<int>("maxTrackPerPattern");
  numberOfPlanesPerPot_ = parameterSet.getParameter<int>("numberOfPlanesPerPot");

  std::string patternFinderAlgorithm = parameterSet.getParameter<std::string>("patternFinderAlgorithm");
  std::string trackFitterAlgorithm = parameterSet.getParameter<std::string>("trackFinderAlgorithm");

  // pattern algorithm selector
  if (patternFinderAlgorithm == "RPixRoadFinder") {
    patternFinder_ = std::make_unique<RPixRoadFinder>(parameterSet);
  } else {
    throw cms::Exception("CTPPSPixelLocalTrackProducer")
        << "Pattern finder algorithm" << patternFinderAlgorithm << " does not exist";
  }

  listOfAllPlanes_.reserve(6);
  for (uint32_t i = 0; i < numberOfPlanesPerPot_; ++i) {
    listOfAllPlanes_.push_back(i);
  }

  //tracking algorithm selector
  if (trackFitterAlgorithm == "RPixPlaneCombinatoryTracking") {
    trackFinder_ = std::make_unique<RPixPlaneCombinatoryTracking>(parameterSet);
  } else {
    throw cms::Exception("CTPPSPixelLocalTrackProducer")
        << "Tracking fitter algorithm" << trackFitterAlgorithm << " does not exist";
  }
  trackFinder_->setListOfPlanes(listOfAllPlanes_);
  trackFinder_->initialize();

  tokenCTPPSPixelRecHit_ = consumes<edm::DetSetVector<CTPPSPixelRecHit>>(inputTag_);
  tokenCTPPSGeometry_ = esConsumes<CTPPSGeometry, VeryForwardRealGeometryRecord>();

  produces<edm::DetSetVector<CTPPSPixelLocalTrack>>();
}

//------------------------------------------------------------------------------------------------//

CTPPSPixelLocalTrackProducer::~CTPPSPixelLocalTrackProducer() {}

//------------------------------------------------------------------------------------------------//

void CTPPSPixelLocalTrackProducer::fillDescriptions(edm::ConfigurationDescriptions &descriptions) {
  edm::ParameterSetDescription desc;

  desc.add<edm::InputTag>("tag", edm::InputTag("ctppsPixelRecHits"))
      ->setComment("inputTag of the RecHits input for the tracking algorithm");
  desc.add<std::string>("patternFinderAlgorithm", "RPixRoadFinder")->setComment("algorithm type for pattern finder");
  desc.add<std::string>("trackFinderAlgorithm", "RPixPlaneCombinatoryTracking")
      ->setComment("algorithm type for track finder");
  desc.add<uint>("trackMinNumberOfPoints", 3)->setComment("minimum number of planes to produce a track");
  desc.addUntracked<int>("verbosity", 0)->setComment("verbosity for track producer");
  desc.add<double>("maximumChi2OverNDF", 5.)->setComment("maximum Chi2OverNDF for accepting the track");
  desc.add<double>("maximumXLocalDistanceFromTrack", 0.2)
      ->setComment("maximum x distance in mm to associate a point not used for fit to the track");
  desc.add<double>("maximumYLocalDistanceFromTrack", 0.3)
      ->setComment("maximum y distance in mm to associate a point not used for fit to the track");
  desc.add<int>("maxHitPerPlane", 20)
      ->setComment("maximum hits per plane, events with higher number will not be fitted");
  desc.add<int>("maxHitPerRomanPot", 60)
      ->setComment("maximum hits per roman pot, events with higher number will not be fitted");
  desc.add<int>("maxTrackPerRomanPot", 10)
      ->setComment("maximum tracks per roman pot, events with higher track will not be saved");
  desc.add<int>("maxTrackPerPattern", 5)
      ->setComment("maximum tracks per pattern, events with higher track will not be saved");
  desc.add<int>("numberOfPlanesPerPot", 6)->setComment("number of planes per pot");
  desc.add<double>("roadRadius", 1.0)->setComment("radius of pattern search window");
  desc.add<int>("minRoadSize", 3)->setComment("minimum number of points in a pattern");
  desc.add<int>("maxRoadSize", 20)->setComment("maximum number of points in a pattern");

  descriptions.add("ctppsPixelLocalTracks", desc);
}

//------------------------------------------------------------------------------------------------//

void CTPPSPixelLocalTrackProducer::produce(edm::Event &iEvent, const edm::EventSetup &iSetup) {
  // Step A: get inputs

  edm::Handle<edm::DetSetVector<CTPPSPixelRecHit>> recHits;
  iEvent.getByToken(tokenCTPPSPixelRecHit_, recHits);
  edm::DetSetVector<CTPPSPixelRecHit> recHitVector(*recHits);

  // get geometry
  edm::ESHandle<CTPPSGeometry> geometryHandler = iSetup.getHandle(tokenCTPPSGeometry_);
  const CTPPSGeometry &geometry = *geometryHandler;
  geometryWatcher_.check(iSetup);

  std::vector<CTPPSPixelDetId> listOfPotWithHighOccupancyPlanes;
  std::map<CTPPSPixelDetId, uint32_t> mapHitPerPot;

  for (const auto &recHitSet : recHitVector) {
    if (verbosity_ > 2)
      edm::LogInfo("CTPPSPixelLocalTrackProducer")
          << "Hits found in plane = " << recHitSet.detId() << " number = " << recHitSet.size();
    CTPPSPixelDetId tmpRomanPotId = CTPPSPixelDetId(recHitSet.detId()).rpId();
    uint32_t hitOnPlane = recHitSet.size();

    //Get the number of hits per pot
    if (mapHitPerPot.find(tmpRomanPotId) == mapHitPerPot.end()) {
      mapHitPerPot[tmpRomanPotId] = hitOnPlane;
    } else
      mapHitPerPot[tmpRomanPotId] += hitOnPlane;

    //check is the plane occupancy is too high and save the corresponding pot
    if (maxHitPerPlane_ >= 0 && hitOnPlane > (uint32_t)maxHitPerPlane_) {
      if (verbosity_ > 2)
        edm::LogInfo("CTPPSPixelLocalTrackProducer")
            << " ---> To many hits in the plane, pot will be excluded from tracking cleared";
      listOfPotWithHighOccupancyPlanes.push_back(tmpRomanPotId);
    }
  }

  //remove rechit for pot with too many hits or containing planes with too many hits
  for (const auto &recHitSet : recHitVector) {
    const auto tmpDetectorId = CTPPSPixelDetId(recHitSet.detId());
    const auto tmpRomanPotId = tmpDetectorId.rpId();

    if ((maxHitPerRomanPot_ >= 0 && mapHitPerPot[tmpRomanPotId] > (uint32_t)maxHitPerRomanPot_) ||
        find(listOfPotWithHighOccupancyPlanes.begin(), listOfPotWithHighOccupancyPlanes.end(), tmpRomanPotId) !=
            listOfPotWithHighOccupancyPlanes.end()) {
      edm::DetSet<CTPPSPixelRecHit> &tmpDetSet = recHitVector[tmpDetectorId];
      tmpDetSet.clear();
    }
  }

  edm::DetSetVector<CTPPSPixelLocalTrack> foundTracks;

  // Pattern finder

  patternFinder_->clear();
  patternFinder_->setHits(&recHitVector);
  patternFinder_->setGeometry(&geometry);
  patternFinder_->findPattern();
  std::vector<RPixDetPatternFinder::Road> patternVector = patternFinder_->getPatterns();

  //loop on all the patterns
  int numberOfTracks = 0;

  for (const auto &pattern : patternVector) {
    CTPPSPixelDetId firstHitDetId = CTPPSPixelDetId(pattern.at(0).detId);
    CTPPSPixelDetId romanPotId = firstHitDetId.rpId();

    std::map<CTPPSPixelDetId, std::vector<RPixDetPatternFinder::PointInPlane>>
        hitOnPlaneMap;  //hit of the pattern organized by plane

    //loop on all the hits of the pattern
    for (const auto &hit : pattern) {
      CTPPSPixelDetId hitDetId = CTPPSPixelDetId(hit.detId);
      CTPPSPixelDetId tmpRomanPotId = hitDetId.rpId();

      if (tmpRomanPotId != romanPotId) {  //check that the hits belong to the same tracking station
        throw cms::Exception("CTPPSPixelLocalTrackProducer")
            << "Hits in the pattern must belong to the same tracking station";
      }

      if (hitOnPlaneMap.find(hitDetId) ==
          hitOnPlaneMap.end()) {  //add the plane key in case it is the first hit of that plane
        std::vector<RPixDetPatternFinder::PointInPlane> hitOnPlane;
        hitOnPlane.push_back(hit);
        hitOnPlaneMap[hitDetId] = hitOnPlane;
      } else
        hitOnPlaneMap[hitDetId].push_back(hit);  //add the hit to an existing plane key
    }

    trackFinder_->clear();
    trackFinder_->setRomanPotId(romanPotId);
    trackFinder_->setHits(&hitOnPlaneMap);
    trackFinder_->setGeometry(&geometry);
    trackFinder_->setZ0(geometry.rpTranslation(romanPotId).z());
    trackFinder_->findTracks(iEvent.getRun().id().run());
    std::vector<CTPPSPixelLocalTrack> tmpTracksVector = trackFinder_->getLocalTracks();

    if (verbosity_ > 2)
      edm::LogInfo("CTPPSPixelLocalTrackProducer") << "tmpTracksVector = " << tmpTracksVector.size();
    if (maxTrackPerPattern_ >= 0 && tmpTracksVector.size() > (uint32_t)maxTrackPerPattern_) {
      if (verbosity_ > 2)
        edm::LogInfo("CTPPSPixelLocalTrackProducer") << " ---> To many tracks in the pattern, cleared";
      continue;
    }

    for (const auto &track : tmpTracksVector) {
      ++numberOfTracks;
      edm::DetSet<CTPPSPixelLocalTrack> &tmpDetSet = foundTracks.find_or_insert(romanPotId);
      tmpDetSet.push_back(track);
    }
  }

  if (verbosity_ > 1)
    edm::LogInfo("CTPPSPixelLocalTrackProducer") << "Number of tracks will be saved = " << numberOfTracks;

  for (const auto &track : foundTracks) {
    if (verbosity_ > 1)
      edm::LogInfo("CTPPSPixelLocalTrackProducer")
          << "Track found in detId = " << track.detId() << " number = " << track.size();
    if (maxTrackPerRomanPot_ >= 0 && track.size() > (uint32_t)maxTrackPerRomanPot_) {
      if (verbosity_ > 1)
        edm::LogInfo("CTPPSPixelLocalTrackProducer") << " ---> Too many tracks in the pot, cleared";
      CTPPSPixelDetId tmpRomanPotId = CTPPSPixelDetId(track.detId());
      edm::DetSet<CTPPSPixelLocalTrack> &tmpDetSet = foundTracks[tmpRomanPotId];
      tmpDetSet.clear();
    }
  }

  iEvent.put(std::make_unique<edm::DetSetVector<CTPPSPixelLocalTrack>>(foundTracks));

  return;
}

DEFINE_FWK_MODULE(CTPPSPixelLocalTrackProducer);