Setting manually magnetic field in AnalysisMuonSelection if not available in ccdb

Author: lucamicheletti

PWGDQ/Tasks/dqEfficiency_withAssoc.cxx

@@ -768,6 +768,7 @@ struct AnalysisMuonSelection {
   Configurable<std::string> fConfigCcdbUrl{"ccdb-url", "http://alice-ccdb.cern.ch", "url of the ccdb repository"};
   Configurable<std::string> grpmagPath{"grpmagPath", "GLO/Config/GRPMagField", "CCDB path of the GRPMagField object"};
   Configurable<int64_t> fConfigNoLaterThan{"ccdb-no-later-than", std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count(), "latest acceptable timestamp of creation for the object"};
+  Configurable<float> fConfigMagField{"cfgMagField", 5.0f, "Manually set magnetic field"};
   Configurable<std::string> fConfigGeoPath{"geoPath", "GLO/Config/GeometryAligned", "Path of the geometry file"};
 
   Configurable<std::string> fConfigMCSignals{"cfgMuonMCSignals", "", "Comma separated list of MC signals"};
@@ -879,14 +880,15 @@ struct AnalysisMuonSelection {
   void runMuonSelection(ReducedMuonsAssoc const& assocs, TEvents const& events, TMuons const& muons, ReducedMCEvents const& /*eventsMC*/, ReducedMCTracks const& muonsMC)
   {
     if (events.size() > 0 && fCurrentRun != events.begin().runNumber()) {
-      /*o2::parameters::GRPMagField* grpmag = fCCDB->getForTimeStamp<o2::parameters::GRPMagField>(grpmagPath, events.begin().timestamp());
+      o2::parameters::GRPMagField* grpmag = fCCDB->getForTimeStamp<o2::parameters::GRPMagField>(grpmagPath, events.begin().timestamp());
       if (grpmag != nullptr) {
         o2::base::Propagator::initFieldFromGRP(grpmag);
         VarManager::SetMagneticField(grpmag->getNominalL3Field());
       } else {
-        LOGF(fatal, "GRP object is not available in CCDB at timestamp=%llu", events.begin().timestamp());
-      }*/
-      VarManager::SetMagneticField(5.0);
+        //LOGF(fatal, "GRP object is not available in CCDB at timestamp=%llu", events.begin().timestamp());
+        // If the magnetic field is not found it is configured by had by the user
+        VarManager::SetMagneticField(fConfigMagField.value);
+      }
       fCurrentRun = events.begin().runNumber();
     }