Set random tmp folder for TrackTuner download.

Author: Mattia Faggin

Common/TableProducer/trackPropagation.cxx

@@ -14,8 +14,11 @@
 //
 
 #include "TableHelper.h"
+
 #include "Common/Tools/TrackTuner.h"
 
+#include "TRandom.h"
+
 // The Run 3 AO2D stores the tracks at the point of innermost update. For a track with ITS this is the innermost (or second innermost)
 // ITS layer. For a track without ITS, this is the TPC inner wall or for loopers in the TPC even a radius beyond that.
 // In order to use the track parameters, the tracks have to be propagated to the collision vertex which is done by this task.
@@ -133,7 +136,13 @@ struct TrackPropagation {
           break;
       }
 
-      trackTunerObj.getDcaGraphs();
+      // define the tmp directory to be used in case of download of the file from CCDB
+      // random number extracted, to avoid file writing in the same tmp directory
+      gRandom->SetSeed(0);
+      unsigned int n = gRandom->Integer(100000);
+      std::string tmpDirName = std::string("./") + std::to_string(n);
+      LOG(info) << " --> rnd number extracted: " << n;
+      trackTunerObj.getDcaGraphs(tmpDirName);
       trackTunedTracks->SetTitle(outputStringParams.c_str());
       trackTunedTracks->GetXaxis()->SetBinLabel(1, "all tracks");
     }

Common/Tools/TrackTuner.h

@@ -447,7 +447,7 @@ struct TrackTuner : o2::framework::ConfigurableGroup {
     return outputString;
   }
 
-  void getDcaGraphs()
+  void getDcaGraphs(std::string tmpDir = ".")
   {
     std::string fullNameInputFile = "";
     std::string fullNameFileQoverPt = "";
@@ -456,7 +456,6 @@ struct TrackTuner : o2::framework::ConfigurableGroup {
       /// use input correction file from CCDB
 
       // properly init the ccdb
-      std::string tmpDir = ".";
       ccdbApi.init("http://alice-ccdb.cern.ch");
 
       // get the DCA correction file from CCDB