[TPC-QC] Add functionality to query the PV position from CCDB.

Author: Maximilian Korwieser

Modules/TPC/include/TPC/Tracks.h

@@ -50,6 +50,7 @@ class Tracks final : public TaskInterface
 
  private:
   o2::tpc::qc::Tracks mQCTracks{}; ///< TPC QC class from o2
+  bool usePVfromCCDB = false;
 };
 
 } // namespace o2::quality_control_modules::tpc

Modules/TPC/run/tpcQCTracks_sampled.json

@@ -29,22 +29,28 @@
         "detectorName": "TPC",
         "cycleDurationSeconds": "10",
         "dataSource_comment": "The other type of dataSource is \"direct\", see basic-no-sampling.json.",
-        "dataSource": {
-          "type": "dataSamplingPolicy",
-          "name": "tpc-tracks"
-        },
+        "dataSources": [
+          { "type": "dataSamplingPolicy", "name": "tpc-tracks" },
+          {
+            "type": "direct",
+            "query": "meanvertex:CTP/MEANVERTEX/0?lifetime=condition&ccdb-path=CTP/Calib/MeanVertex"
+          }
+        ],
         "taskParameters": {
-          "cutAbsEta": "1.",  "cutMinNCluster": "60", "cutMindEdxTot": "20."
+          "cutAbsEta": "1.",
+          "cutMinNCluster": "60",
+          "cutMindEdxTot": "20.",
+          "usePVfromCCDB": "true"
         },
-	"grpGeomRequest" : {
+        "grpGeomRequest": {
           "geomRequest": "None",
           "askGRPECS": "false",
           "askGRPLHCIF": "false",
           "askGRPMagField": "true",
           "askMatLUT": "true",
           "askTime": "false",
           "askOnceAllButField": "true",
-          "needPropagatorD":  "false"
+          "needPropagatorD": "false"
         },
         "location": "remote"
       }
@@ -56,11 +62,13 @@
         "moduleName": "QcSkeleton",
         "policy": "OnAny",
         "detectorName": "TPC",
-        "dataSource": [{
-          "type": "Task",
-          "name": "Tracks",
-          "MOs": ["example"]
-        }]
+        "dataSource": [
+          {
+            "type": "Task",
+            "name": "Tracks",
+            "MOs": ["example"]
+          }
+        ]
       }
     }
   },

Modules/TPC/src/Tracks.cxx

@@ -22,6 +22,7 @@
 // O2 includes
 #include "Framework/ProcessingContext.h"
 #include "DataFormatsTPC/TrackTPC.h"
+#include "DataFormatsCalibration/MeanVertexObject.h"
 #include "TPCQC/Helpers.h"
 #include <Framework/InputRecord.h>
 
@@ -46,6 +47,8 @@ void Tracks::initialize(o2::framework::InitContext& /*ctx*/)
   const float cutMaxAbsDCAr = o2::quality_control_modules::common::getFromConfig<float>(mCustomParameters, "cutMaxAbsDCAr", 0.1);
   const bool useCutMaxAbsDCArOnHistos = o2::quality_control_modules::common::getFromConfig<bool>(mCustomParameters, "useCutMaxAbsDCArOnHistos");
 
+  usePVfromCCDB = o2::quality_control_modules::common::getFromConfig<bool>(mCustomParameters, "usePVfromCCDB");
+
   // set track cuts defaults are (AbsEta = 1.0, nCluster = 60, MindEdxTot  = 20)
   mQCTracks.setTrackCuts(cutAbsEta, cutMinNCluster, cutMindEdxTot, cutPtForDCAr, samplingFractionDCAr, runAsyncAndTurnOffSomeHistos, cutMaxAbsDCAr, useCutMaxAbsDCArOnHistos);
 
@@ -70,6 +73,16 @@ void Tracks::startOfCycle()
 
 void Tracks::monitorData(o2::framework::ProcessingContext& ctx)
 {
+  // set the coordinates of the PV (extracted from CCDB)
+  if (usePVfromCCDB) {
+    auto coordinatesOfPV = ctx.inputs().get<o2::dataformats::MeanVertexObject*>("CTP/Calib/MeanVertex");
+    if (!coordinatesOfPV) {
+      LOGP(error, "Failed to retrieve MeanVertexObject, using default (0,0,0) instead!");
+    } else {
+      mQCTracks.setPVposition(coordinatesOfPV->getPos());
+    }
+  }
+
   using TrackType = std::vector<o2::tpc::TrackTPC>;
   auto tracks = ctx.inputs().get<TrackType>("inputTracks");