fetch efficiency map for iotof from ccdb

Author: GiorgioAlbertoLucia

Detectors/Upgrades/ALICE3/IOTOF/simulation/include/IOTOFSimulation/DPLDigitizerParam.h

@@ -32,6 +32,8 @@ struct DPLDigitizerParam : public o2::conf::ConfigurableParamHelper<DPLDigitizer
   float efficiency = 0.98f;               ///< detection efficiency
   std::string efficiencyFilePath{};       ///< optional efficiency map file path.
                                           ///< The efficiency map is currently available at /alice/cern.ch/user/g/glucia/ALICE3/IOTOF/pixelEfficiency/PixelEfficiencyMap_TH2.root. FIXME to be removed once switch to CCDBFetcher
+  std::string efficiencyCcdbPath{};       ///< optional efficiency map CCDB path.
+                                          ///< The efficiency map is currently available at Users/g/glucia/tmp/ALICE3/IOTOF/pixelEfficiency
   int chargeThreshold = 100;              ///< charge threshold in Nelectrons
   int minChargeToAccount = 7;             ///< minimum charge contribution to account
   int nSimSteps = 10;                     ///< number of steps in response simulation

Detectors/Upgrades/ALICE3/IOTOF/simulation/include/IOTOFSimulation/Digitizer.h

@@ -93,6 +93,7 @@ class Digitizer : public TObject
 
   /// Load the efficiency map from a file
   void loadEfficiencyMap(const std::string& filePath);
+  void loadEfficiencyMapFromCCDB(const std::string& ccdbPath);
 
   /// Check if the hit passes efficiency cut
   /// \param x Detector local coordinate x in cm with respect to the center of the sensitive volume.

Detectors/Upgrades/ALICE3/IOTOF/simulation/src/Digitizer.cxx

@@ -16,6 +16,7 @@
 /// \since 2026-03-17
 ///
 
+#include <CCDB/BasicCCDBManager.h>
 #include "IOTOFSimulation/Digitizer.h"
 #include "IOTOFSimulation/DPLDigitizerParam.h"
 #include "DetectorsRaw/HBFUtils.h"
@@ -54,17 +55,24 @@ void Digitizer::init()
     ///   mChips[i].setDeadChanMap(mDeadChanMap);
     /// }
   }
-
+  
   const auto& digitizerParams = o2::iotof::DPLDigitizerParam::Instance();
-  if (!digitizerParams.efficiencyFilePath.empty()) {
-    loadEfficiencyMap(digitizerParams.efficiencyFilePath);
-  }
 
   LOG(info) << "Initializing IOTOF digitizer";
   LOG(info) << "  Time resolution: " << digitizerParams.timeResolution * 1e3 << " ps";
   LOG(info) << "  Charge threshold: " << digitizerParams.chargeThreshold << " electrons";
-  LOG(info) << "  Detection efficiency: " << digitizerParams.efficiency * 100 << " %";
   LOG(info) << "  Continuous mode: " << (mContinuous ? "ON" : "OFF");
+  
+  if (!digitizerParams.efficiencyCcdbPath.empty()) {
+    LOG(info) << "Loading efficiency map from CCDB path: " << digitizerParams.efficiencyCcdbPath;
+    loadEfficiencyMapFromCCDB(digitizerParams.efficiencyCcdbPath);
+  } else if (!digitizerParams.efficiencyFilePath.empty()) {
+    LOG(info) << "Loading efficiency map from file: " << digitizerParams.efficiencyFilePath;
+    loadEfficiencyMap(digitizerParams.efficiencyFilePath);
+  } else {
+    LOG(info) << "No efficiency map provided, using uniform efficiency: " << digitizerParams.efficiency * 100 << " %";
+  }
+
   sSegmentation = o2::iotof::Segmentation::Instance();
 }
 
@@ -387,6 +395,25 @@ void Digitizer::loadEfficiencyMap(const std::string& filePath)
   file->Close();
 }
 
+//_______________________________________________________________________
+void Digitizer::loadEfficiencyMapFromCCDB(const std::string& ccdbPath)  
+{
+  // Load the efficiency map from CCDB
+  auto rawMap = o2::ccdb::BasicCCDBManager::instance().get<TH2D>(ccdbPath);
+  if (!rawMap) {
+    LOG(error) << "Failed to retrieve efficiency map from CCDB path: " << ccdbPath;
+    return;
+  } else {
+    LOG(info) << "Successfully retrieved efficiency map from CCDB path: " << ccdbPath;
+    LOG(info) << "Efficiency map dimensions: " << rawMap->GetNbinsX() << " x " << rawMap->GetNbinsY();
+  }
+  
+  mEfficiencyMap = dynamic_cast<TH2D*>(rawMap->Clone("mEfficiencyMap"));
+  mEfficiencyMap->SetDirectory(nullptr); // Detach from file to avoid deletion when file is closed
+
+  LOG(info) << "Successfully loaded efficiency map from CCDB path: " << ccdbPath;
+}
+
 //_______________________________________________________________________
 bool Digitizer::isEfficient(const float x, const float z) const
 {