SIOVPmtGainProvider.cxx

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#ifndef SIOVPMTGAINPROVIDER_CXX
#define SIOVPMTGAINPROVIDER_CXX

#include "SIOVPmtGainProvider.h"
#include "WebError.h"

// art/LArSoft libraries
#include "cetlib_except/exception.h"
#include "larcore/Geometry/Geometry.h"
#include "messagefacility/MessageLogger/MessageLogger.h"

#include <fstream>

namespace lariov {

  //constructor      
  SIOVPmtGainProvider::SIOVPmtGainProvider(fhicl::ParameterSet const& p) :
    DatabaseRetrievalAlg(p.get<fhicl::ParameterSet>("DatabaseRetrievalAlg")),
    fEventTimeStamp(0),
    fCurrentTimeStamp(0) {
    
    this->Reconfigure(p);
  }
      
  void SIOVPmtGainProvider::Reconfigure(fhicl::ParameterSet const& p) {
    
    this->DatabaseRetrievalAlg::Reconfigure(p.get<fhicl::ParameterSet>("DatabaseRetrievalAlg"));
    fData.Clear();
    IOVTimeStamp tmp = IOVTimeStamp::MaxTimeStamp();
    tmp.SetStamp(tmp.Stamp()-1, tmp.SubStamp());
    fData.SetIoV(tmp, IOVTimeStamp::MaxTimeStamp());

    bool UseDB      = p.get<bool>("UseDB", false);
    bool UseFile    = p.get<bool>("UseFile", false);
    std::string fileName = p.get<std::string>("FileName", "");

    //priority:  (1) use db, (2) use table, (3) use defaults
    //If none are specified, use defaults
    if ( UseDB )      fDataSource = DataSource::Database;
    else if (UseFile) fDataSource = DataSource::File;
    else              fDataSource = DataSource::Default;

    if (fDataSource == DataSource::Default) {
      float default_gain     = p.get<float>("DefaultGain");
      float default_gain_err = p.get<float>("DefaultGainErr");

      PmtGain defaultGain(0);

      defaultGain.SetGain(default_gain);
      defaultGain.SetGainErr(default_gain_err);
      defaultGain.SetExtraInfo(CalibrationExtraInfo("PmtGain"));
      
      art::ServiceHandle<geo::Geometry> geo;
      for (unsigned int od=0; od!=geo->NOpDets(); ++od) {
        if (geo->IsValidOpChannel(od)) {
          defaultGain.SetChannel(od);
          fData.AddOrReplaceRow(defaultGain);
        }
      }
      
    }
    else if (fDataSource == DataSource::File) {
      cet::search_path sp("FW_SEARCH_PATH");
      std::string abs_fp = sp.find_file(fileName);
      std::cout << "Using pmt gains from local file: "<<abs_fp<<"\n";
      std::ifstream file(abs_fp);
      if (!file) {
        throw cet::exception("SIOVPmtGainProvider")
          << "File "<<abs_fp<<" is not found.";
      }

      std::string line;
      PmtGain dp(0);
      while (std::getline(file, line)) {
        if (line[0] == '#') continue;
        size_t current_comma = line.find(',');
        DBChannelID_t ch = (DBChannelID_t)std::stoi(line.substr(0, current_comma));   
        float gain     = std::stof( line.substr(current_comma+1, line.find(',',current_comma+1)-(current_comma+1)) );
        
        current_comma = line.find(',',current_comma+1);
        float gain_err = std::stof( line.substr(current_comma+1) );

        CalibrationExtraInfo info("PmtGain");

        dp.SetChannel(ch);
        dp.SetGain(gain);
        dp.SetGainErr(gain_err);
        dp.SetExtraInfo(info);
        
        fData.AddOrReplaceRow(dp);
      }
    }
    else {
      std::cout << "Using pmt gains from conditions database"<<std::endl;
    }
  }

  // This method saves the time stamp of the latest event.

  void SIOVPmtGainProvider::UpdateTimeStamp(DBTimeStamp_t ts) {
    mf::LogInfo("SIOVPmtGainProvider") << "SIOVPmtGainProvider::UpdateTimeStamp called.";
    fEventTimeStamp = ts;
  }

  // Maybe update method cached data (public non-const version).

  bool SIOVPmtGainProvider::Update(DBTimeStamp_t ts) {
    
    fEventTimeStamp = ts;
    return DBUpdate(ts);
  }

  // Maybe update method cached data (private const version using current event time).

  bool SIOVPmtGainProvider::DBUpdate() const {
    return DBUpdate(fEventTimeStamp);
  }

  // Maybe update method cached data (private const version).
  // This is the function that does the actual work of updating data from database.

  bool SIOVPmtGainProvider::DBUpdate(DBTimeStamp_t ts) const {

    bool result = false;
    if (fDataSource == DataSource::Database && ts != fCurrentTimeStamp) {
      
      mf::LogInfo("SIOVPmtGainProvider") << "SIOVPmtGainProvider::DBUpdate called with new timestamp.";

      fCurrentTimeStamp = ts;     

      // Call non-const base class method.

      result = const_cast<SIOVPmtGainProvider*>(this)->UpdateFolder(ts);
      if(result) {
        //DBFolder was updated, so now update the Snapshot
        fData.Clear();
        fData.SetIoV(this->Begin(), this->End());

        std::vector<DBChannelID_t> channels;
        fFolder->GetChannelList(channels);
        for (auto it = channels.begin(); it != channels.end(); ++it) {

          double gain, gain_err;
          fFolder->GetNamedChannelData(*it, "gain",     gain);
          fFolder->GetNamedChannelData(*it, "gain_sigma", gain_err); 

          PmtGain pg(*it);
          pg.SetGain( (float)gain );
          pg.SetGainErr( (float)gain_err );
          pg.SetExtraInfo(CalibrationExtraInfo("PmtGain"));

          fData.AddOrReplaceRow(pg);
        }
      }
    }

    return result;
  }
  
  const PmtGain& SIOVPmtGainProvider::PmtGainObject(DBChannelID_t ch) const { 
    DBUpdate();
    return fData.GetRow(ch);
  }
      
  float SIOVPmtGainProvider::Gain(DBChannelID_t ch) const {
    return this->PmtGainObject(ch).Gain();
  }
  
  float SIOVPmtGainProvider::GainErr(DBChannelID_t ch) const {
    return this->PmtGainObject(ch).GainErr();
  }
  
  CalibrationExtraInfo const& SIOVPmtGainProvider::ExtraInfo(DBChannelID_t ch) const {
    return this->PmtGainObject(ch).ExtraInfo();
  }


}//end namespace lariov
        
#endif