TPC: Use CTP as fallback if no IDCs are available

[matthias-kleiner]

This PR adds a fallback to CTP scaling in case the IDCs are missing. When IDCs are missing, the default IDC object is used, which is =-1. In that case a wrong scaling is applied.
Local test with few TFs looks good so far:

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[shahor02]

@matthias-kleiner thanks, looks fine, but as far as I can see, once fall-back is triggered, it will persist even if the IDC scaler was recovered. Perhaps we should add to the loader a backup value mLumiScaleTypeBackup of the original mLumiScaleType and in the beginning of every TF do

if (mIDC2CTPFallbackActive) {
  mIDC2CTPFallbackActive = false;
  mLumiScaleType = mLumiScaleTypeBackup;
}

?

[matthias-kleiner]

Hi @shahor02 ,
the lumi scale type should be already recovered since I do:

if (getLumiScaleType() == 2 || mIDC2CTPFallbackActive) {
...
      if (mIDC2CTPFallbackActive) {
        // reset back to normal operation
        LOGP(info, "Valid TPC scaler value {} received, switching back to IDC-based scaling", tpcScaler);
        mIDC2CTPFallbackActive = false;
        setMeanLumi(mCorrMap->getIDC(), false);
        setMeanLumiRef(mCorrMapRef->getIDC());
        setLumiScaleType(2);
      }

You can also see it in the attached log that it goes back to Valid TPC scaler value 2.8228905 received, switching back to IDC-based scaling
reco.log

But I think I dont need to call setUpdatedMap(); and setUpdatedMapRef();as I update only the lumi or?

[shahor02]

Sorry, missed this. You indeed don't need to call setUpdatedMap() and setUpdatedMapRef(): the setInstLumi() internally triggers setUpdatedLumi(); state change.