TPC: Fix digitizer workflow to load GEM params from CCDB before creating Polya file

Author: tubagundem

Steer/DigitizerWorkflow/src/SimpleDigitizerWorkflow.cxx

@@ -286,7 +286,7 @@ int getNumTPCLanes(std::vector<int> const& sectors, ConfigContext const& configc
 
 // ------------------------------------------------------------------
 
-void initTPC()
+void initTPC(long timestamp)
 {
   // We only want to do this for the DPL master
   // I am not aware of an easy way to query if "I am DPL master" so
@@ -308,6 +308,12 @@ void initTPC()
 
   auto& cdb = o2::tpc::CDBInterface::instance();
   cdb.setUseDefaults();
+
+  // IMPORTANT: load ParameterGEM from CCDB
+  auto& ccdbManager = o2::ccdb::BasicCCDBManager::instance();
+  ccdbManager.getSpecific<o2::tpc::ParameterGEM>(o2::tpc::CDBTypeMap.at(o2::tpc::CDBType::ParGEM), timestamp);
+  LOGP(info, "initTPC: TPC GEM param updated for time {}", timestamp);
+  o2::tpc::ParameterGEM::Instance().printKeyValues(true, true);
   // by invoking this constructor we make sure that a common file will be created
   // in future we should take this from OCDB and just forward per message
   const static auto& ampl = o2::tpc::GEMAmplification::instance();
@@ -592,7 +598,7 @@ WorkflowSpec defineDataProcessing(ConfigContext const& configcontext)
 
   if (isEnabled(o2::detectors::DetID::TPC)) {
     if (!helpasked && ismaster) {
-      initTPC();
+      initTPC(hbfu.startTime);
     }
 
     tpcsectors = o2::RangeTokenizer::tokenize<int>(configcontext.options().get<std::string>("tpc-sectors"));