]> git.uio.no Git - u/mrichter/AliRoot.git/blobdiff - TRD/AliTRDReconstructor.cxx
ALIROOT-5488 Remove build/include from the include directories
[u/mrichter/AliRoot.git] / TRD / AliTRDReconstructor.cxx
index 7e8315c96bfbb06952786b60139fea7e9722fad1..ce3c1c3fe317a8bcbae60cf1f87d3198fc363f8c 100644 (file)
 /**************************************************************************
- * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
- *                                                                        *
- * Author: The ALICE Off-line Project.                                    *
- * Contributors are mentioned in the code where appropriate.              *
- *                                                                        *
- * Permission to use, copy, modify and distribute this software and its   *
- * documentation strictly for non-commercial purposes is hereby granted   *
- * without fee, provided that the above copyright notice appears in all   *
- * copies and that both the copyright notice and this permission notice   *
- * appear in the supporting documentation. The authors make no claims     *
- * about the suitability of this software for any purpose. It is          *
- * provided "as is" without express or implied warranty.                  *
- **************************************************************************/
+* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+*                                                                        *
+* Author: The ALICE Off-line Project.                                    *
+* Contributors are mentioned in the code where appropriate.              *
+*                                                                        *
+* Permission to use, copy, modify and distribute this software and its   *
+* documentation strictly for non-commercial purposes is hereby granted   *
+* without fee, provided that the above copyright notice appears in all   *
+* copies and that both the copyright notice and this permission notice   *
+* appear in the supporting documentation. The authors make no claims     *
+* about the suitability of this software for any purpose. It is          *
+* provided "as is" without express or implied warranty.                  *
+**************************************************************************/
 
 /* $Id$ */
 
 ///////////////////////////////////////////////////////////////////////////////
 //                                                                           //
 // Class for TRD reconstruction                                              //
+//                                                                           //   
+// For the special options which can be used during reconstruction and their //
+//  default values pls. see function SetOption().                            //
 //                                                                           //
 ///////////////////////////////////////////////////////////////////////////////
 
-#include <TFile.h>
+#include <TObjString.h>
+#include <TObjArray.h>
+#include <TTreeStream.h>
+#include <TDirectory.h>
+#include <TRef.h>
 
-#include "AliRunLoader.h"
 #include "AliRawReader.h"
 #include "AliLog.h"
-#include "AliESDTrdTrack.h"
-#include "AliESDEvent.h"
 
 #include "AliTRDReconstructor.h"
-#include "AliTRDclusterizerV1.h"
-#include "AliTRDclusterizerV2.h"
-#include "AliTRDtracker.h"
-#include "AliTRDpidESD.h"
-#include "AliTRDgtuTrack.h"
+#include "AliTRDclusterizer.h"
 #include "AliTRDrawData.h"
+#include "AliTRDrawStream.h"
 #include "AliTRDdigitsManager.h"
+#include "AliTRDtrackerV1.h"
+#include "AliESDEvent.h"
+#include "AliESDTrdTrack.h"
+#include "AliESDTrdTracklet.h"
+#include "AliESDTrdTrigger.h"
+#include "AliTRDtrackletWord.h"
+#include "AliTRDtrackletMCM.h"
+#include "AliTRDonlineTrackMatching.h"
+
+#define SETFLG(n,f) ((n) |= f)
+#define CLRFLG(n,f) ((n) &= ~f)
 
 ClassImp(AliTRDReconstructor)
 
-Bool_t AliTRDReconstructor::fgkSeedingOn  = kFALSE;
-Int_t  AliTRDReconstructor::fgStreamLevel = 0;      // Stream (debug) level
+Int_t    AliTRDReconstructor::fgStreamLevel     = 1;        // stream (debug) level
+
+
+AliESDTrdTrigger AliTRDReconstructor::fgTriggerFlags;
+AliTRDonlineTrackMatching AliTRDReconstructor::fgOnlineTrackMatcher;
+TClonesArray *AliTRDReconstructor::fgClusters = NULL;
+TClonesArray *AliTRDReconstructor::fgTracklets = NULL;
+TClonesArray *AliTRDReconstructor::fgTracks = NULL;
+Char_t const * AliTRDReconstructor::fgSteerNames[kNsteer] = {
+  "DigitsConversion       "
+ ,"Write Clusters         "
+ ,"Write Online Tracklets "
+ ,"Stand Alone Tracking   "
+ ,"HLT Mode              "
+ ,"Process Online Trklts  "
+ ,"Debug Streaming       "
+ ,"Cl. Radial Correction  "
+};
+Char_t const * AliTRDReconstructor::fgSteerFlags[kNsteer] = {
+  "dc"// digits conversion [false]
+ ,"cw"// write clusters [true]
+ ,"tw"// write online tracklets [false]
+ ,"sa"// track seeding (stand alone tracking) [true]
+ ,"hlt"// HLT reconstruction [false]
+ ,"tp"// also use online tracklets for reconstruction [false]
+ ,"deb"// Write debug stream [false]
+ ,"cc" // Cluster radial correction during reconstruction [false]
+};
+Char_t const * AliTRDReconstructor::fgTaskNames[AliTRDrecoParam::kTRDreconstructionTasks] = {
+  "Clusterizer"
+ ,"Tracker"
+ ,"PID"
+};
+Char_t const * AliTRDReconstructor::fgTaskFlags[AliTRDrecoParam::kTRDreconstructionTasks] = {
+  "cl"
+ ,"tr"
+ ,"pd"
+};
+Int_t AliTRDReconstructor::fgNTimeBins = -1;
+const  Float_t  AliTRDReconstructor::fgkMinClustersInTrack =  0.5;  //
+const  Float_t  AliTRDReconstructor::fgkLabelFraction      =  0.8;  //
+const  Double_t AliTRDReconstructor::fgkMaxChi2            = 12.0;  //
+const  Double_t AliTRDReconstructor::fgkMaxSnp             =  0.95; // Maximum local sine of the azimuthal angle
+const  Double_t AliTRDReconstructor::fgkMaxStep            =  2.0;  // Maximal step size in propagation
+const Double_t  AliTRDReconstructor::fgkEpsilon            = 1.e-5;                  // Precision of radial coordinate
 
 //_____________________________________________________________________________
-void AliTRDReconstructor::ConvertDigits(AliRawReader *rawReader
-                                     , TTree *digitsTree) const
+AliTRDReconstructor::AliTRDReconstructor()
+  :AliReconstructor()
+  ,fSteerParam(0)
+  ,fClusterizer(NULL)
+{
+  // setting default "ON" steering parameters
+  // owner of debug streamers 
+  SETFLG(fSteerParam, kOwner);
+  // write clusters [cw]
+  SETFLG(fSteerParam, kWriteClusters);
+  // track seeding (stand alone tracking) [sa]
+  //SETFLG(fSteerParam, kSeeding);
+  // Cluster radial correction during reconstruction [cc]
+  //SETFLG(fSteerParam, kClRadialCorr);
+  memset(fDebugStream, 0, sizeof(TTreeSRedirector *) * AliTRDrecoParam::kTRDreconstructionTasks);
+}
+
+//_____________________________________________________________________________
+AliTRDReconstructor::~AliTRDReconstructor()
 {
   //
-  // Convert raw data digits into digit objects in a root tree
+  // Destructor
   //
 
-  AliInfo("Convert raw data digits into digit objects [RawReader -> Digit TTree]");
+  if(fClusterizer){
+    delete fClusterizer;
+    fClusterizer = NULL;
+  }
+  if(fgClusters) {
+    fgClusters->Delete();
+    delete fgClusters;
+    fgClusters = NULL;
+  }
+  if(fgTracklets) {
+    fgTracklets->Delete();
+    delete fgTracklets;
+    fgTracklets = NULL;
+  }
+  if(fgTracks) {
+    fgTracks->Delete();
+    delete fgTracks;
+    fgTracks = NULL;
+  }
+  if((fSteerParam&kOwner)||  AliTRDReconstructor::GetStreamLevel()>0){
+    for(Int_t itask = 0; itask < AliTRDrecoParam::kTRDreconstructionTasks; itask++)
+      if(fDebugStream[itask]) delete fDebugStream[itask];
+  }
+}
 
-  AliTRDrawData rawData;
-  rawReader->Reset();
-  rawReader->Select("TRD");
-  AliTRDdigitsManager *manager = rawData.Raw2Digits(rawReader);
-  manager->MakeBranch(digitsTree);
-  manager->WriteDigits();
-  delete manager;
 
+//_____________________________________________________________________________
+void AliTRDReconstructor::Init(){
+  //
+  // Init Options
+  //
+  SetOption(GetOption());
+  Options(fSteerParam);
+
+  if(!fClusterizer){
+    fClusterizer = new AliTRDclusterizer(fgTaskNames[AliTRDrecoParam::kClusterizer], fgTaskNames[AliTRDrecoParam::kClusterizer]);
+    fClusterizer->SetReconstructor(this);
+    AliInfo(Form("Build TRD clusterizer[%p]", (void*)fClusterizer));
+  }
+  
+  // Make Debug Streams when Debug Streaming
+  if(IsDebugStreaming()){
+    for(Int_t task = 0; task < AliTRDrecoParam::kTRDreconstructionTasks; task++){
+      TDirectory *savedir = gDirectory;
+      fDebugStream[task] = new TTreeSRedirector(Form("TRD.Debug%s.root", fgTaskNames[task]),"recreate");
+      savedir->cd();
+      SETFLG(fSteerParam, kOwner);
+    }
+  }
 }
 
 //_____________________________________________________________________________
-void AliTRDReconstructor::Reconstruct(AliRunLoader *runLoader
-                                    , AliRawReader *rawReader) const
+void AliTRDReconstructor::ConvertDigits(AliRawReader *rawReader
+              , TTree *digitsTree) const
 {
   //
-  // Reconstruct clusters
+  // Convert raw data digits into digit objects in a root tree
   //
 
-  AliInfo("Reconstruct TRD clusters from RAW data [RunLoader, RawReader]");
-
-  AliLoader *loader = runLoader->GetLoader("TRDLoader");
-  loader->LoadRecPoints("recreate");
-
-  runLoader->CdGAFile();
-  Int_t nEvents = runLoader->GetNumberOfEvents();
+  AliDebug(1, "Convert raw data digits into digit objects [RawReader -> Digit TTree]");
+  AliDebug(2, Form("clusters[%p] tracklets[%p] tracks[%p]", (void*)fgClusters, (void*)fgTracklets, (void*)fgTracks));
 
   rawReader->Reset();
   rawReader->Select("TRD");
+  ResetContainers();
 
-  for (Int_t iEvent = 0; iEvent < nEvents; iEvent++) {
-
-    if (!rawReader->NextEvent()) break;
-
-    // Old (slow) cluster finder
-    //AliTRDclusterizerV1 clusterer("clusterer","TRD clusterizer");
-    //clusterer.Open(runLoader->GetFileName(),iEvent);
-    //clusterer.ReadDigits(rawReader);
-    //clusterer.MakeClusters();
-
-    // New (fast) cluster finder
-    AliTRDclusterizerV2 clusterer("clusterer","TRD clusterizer");
-    clusterer.Open(runLoader->GetFileName(),iEvent);
-    clusterer.Raw2ClustersChamber(rawReader);
-
-    clusterer.WriteClusters(-1);
-
-  }
+  AliTRDrawData rawData;
 
-  loader->UnloadRecPoints();
+  AliTRDdigitsManager *manager = rawData.Raw2Digits(rawReader);
+  manager->MakeBranch(digitsTree);
+  manager->WriteDigits();
+  delete manager;
 
+  for (Int_t iSector = 0; iSector < 18; iSector++) fgTriggerFlags.SetFlags(iSector, rawData.GetTriggerFlags(iSector));
 }
 
 //_____________________________________________________________________________
@@ -113,22 +207,22 @@ void AliTRDReconstructor::Reconstruct(AliRawReader *rawReader
   // Reconstruct clusters
   //
 
-  AliInfo("Reconstruct TRD clusters from RAW data [RawReader -> Cluster TTree]");
-
+  AliDebug(1, "Reconstruct TRD clusters from RAW data [RawReader -> Cluster TTree]");
+  AliDebug(2, Form("clusters[%p] tracklets[%p] tracks[%p]", (void*)fgClusters, (void*)fgTracklets, (void*)fgTracks));
+  if(!fClusterizer){
+    AliFatal("Clusterizer not available!");
+    return;
+  }
   rawReader->Reset();
   rawReader->Select("TRD");
-
-  // Old (slow) cluster finder
-  //AliTRDclusterizerV1 clusterer("clusterer","TRD clusterizer");
-  //clusterer.OpenOutput(clusterTree);
-  //clusterer.ReadDigits(rawReader);
-  //clusterer.MakeClusters();
-
-  // New (fast) cluster finder
-  AliTRDclusterizerV2 clusterer("clusterer","TRD clusterizer");
-  clusterer.OpenOutput(clusterTree);
-  clusterer.SetAddLabels(kFALSE);
-  clusterer.Raw2ClustersChamber(rawReader);
+  ResetContainers();
+  fClusterizer->OpenOutput(clusterTree);
+  fClusterizer->SetUseLabels(kFALSE);
+  fClusterizer->SetStoreRawSignals(kTRUE);
+  fClusterizer->ResetRecPoints();
+  fClusterizer->Raw2ClustersChamber(rawReader);
+  fgNTimeBins = fClusterizer->GetNTimeBins();
+  for (Int_t iSector = 0; iSector < 18; iSector++) fgTriggerFlags.SetFlags(iSector, fClusterizer->GetTriggerFlags(iSector));
 }
 
 //_____________________________________________________________________________
@@ -138,106 +232,213 @@ void AliTRDReconstructor::Reconstruct(TTree *digitsTree
   //
   // Reconstruct clusters
   //
-  AliInfo("Reconstruct TRD clusters from Digits [Digit TTree -> Cluster TTree]");
 
-  //AliTRDclusterizerV1 clusterer("clusterer","TRD clusterizer");
-  AliTRDclusterizerV2 clusterer("clusterer","TRD clusterizer");
-  clusterer.OpenOutput(clusterTree);
-  clusterer.ReadDigits(digitsTree);
-  clusterer.MakeClusters();
+  AliDebug(1, "Reconstruct TRD clusters from Digits [Digit TTree -> Cluster TTree]");
+  AliDebug(2, Form("Start :: clusters[%p] tracklets[%p] tracks[%p]", (void*)fgClusters, (void*)fgTracklets, (void*)fgTracks));
+  if(!fClusterizer){
+    AliFatal("Clusterizer not available!");
+    return;
+  }
+
+  ResetContainers();
+  AliTRDclusterizer clusterizer(fgTaskNames[AliTRDrecoParam::kClusterizer], fgTaskNames[AliTRDrecoParam::kClusterizer]);
+  clusterizer.SetReconstructor(this);
+  clusterizer.SetUseLabels(kTRUE);
+  clusterizer.SetStoreRawSignals(kTRUE);
+  clusterizer.OpenOutput(clusterTree);
+  clusterizer.ReadDigits(digitsTree);
+  clusterizer.ReadTracklets();
+  clusterizer.ReadTracks();
+  clusterizer.MakeClusters();
+  fgNTimeBins = clusterizer.GetNTimeBins();
 }
 
 //_____________________________________________________________________________
-void AliTRDReconstructor::Reconstruct(AliRunLoader *runLoader) const
+AliTracker *AliTRDReconstructor::CreateTracker() const
 {
   //
-  // Reconstruct clusters
+  // Create a TRD tracker
   //
 
-  AliInfo("Reconstruct TRD clusters [AliRunLoader]");
-  AliLoader *loader = runLoader->GetLoader("TRDLoader");
-  loader->LoadRecPoints("recreate");
-
-  runLoader->CdGAFile();
-  Int_t nEvents = runLoader->GetNumberOfEvents();
-
-  for (Int_t iEvent = 0; iEvent < nEvents; iEvent++) {
-    AliTRDclusterizerV1 clusterer("clusterer","TRD clusterizer");
-    //AliTRDclusterizerV2 clusterer("clusterer","TRD clusterizer");
-    clusterer.Open(runLoader->GetFileName(),iEvent);
-    clusterer.ReadDigits();
-    clusterer.MakeClusters();
-    clusterer.WriteClusters(-1);
-  }
-
-  loader->UnloadRecPoints();
+  //return new AliTRDtracker(NULL);
+  AliTRDtrackerV1 *tracker = new AliTRDtrackerV1();
+  tracker->SetReconstructor(this);
+  AliInfo(Form("Build TRD tracker[%p]", (void*)tracker));
+  return tracker;
 
 }
 
 //_____________________________________________________________________________
-AliTracker *AliTRDReconstructor::CreateTracker(AliRunLoader *runLoader) const
+void AliTRDReconstructor::FillESD(TTree* /*digitsTree*/
+        , TTree* /*clusterTree*/
+        , AliESDEvent* esd) const
 {
   //
-  // Create a TRD tracker
+  // Fill ESD
   //
 
-  runLoader->CdGAFile();
+  // ----- filling tracklets -----
+  AliDebug(1, Form("Loading onl.tracklets(%i) to ESD", fgTracklets ? fgTracklets->GetEntriesFast() : 0));
+  Int_t trackletIndex[1080] = { 0 };
+  TList trklList;
+  AliTRDrawStream::SortTracklets(fgTracklets, trklList, trackletIndex);
+  TIter trackletIter(&trklList);
+  while (AliTRDtrackletBase* tracklet = (AliTRDtrackletBase*) trackletIter()) {
+    Int_t label = -2; // mark raw tracklets with label -2
+    if (AliTRDtrackletMCM *trklMCM = dynamic_cast<AliTRDtrackletMCM*> (tracklet)) label = trklMCM->GetLabel();
+    esd->AddTrdTracklet(tracklet->GetTrackletWord(), tracklet->GetHCId(), label);
+  }
 
-  return new AliTRDtracker(gFile);
+  // ----- filling GTU tracks -----
+  AliDebug(1, Form("Loading gtu.tracks(%i) to ESD", fgTracks ? fgTracks->GetEntriesFast() : 0));
+  if (fgTracks) {
+    for (Int_t iTrack = 0; iTrack < fgTracks->GetEntriesFast(); iTrack++) {
+      AliESDTrdTrack *trdTrack = (AliESDTrdTrack*) ((*fgTracks)[iTrack]);
+
+      UInt_t stack = trdTrack->GetStack();
+
+      Int_t refIndex[6];
+      AliTRDrawStream::AssignTracklets(trdTrack, trackletIndex, refIndex);
+
+      for (Int_t iLayer = 0; iLayer < 6; ++iLayer) {
+        Int_t det = trdTrack->GetSector()*30 + stack*6 + iLayer;
+        AliESDTrdTracklet *trkl = refIndex[iLayer] > -1 ? esd->GetTrdTracklet(refIndex[iLayer]) : 0x0;
+        if (trkl) {
+          AliDebug(5, Form("adding tracklet with index %i: 0x%08x",
+              refIndex[iLayer], trkl->GetTrackletWord()));
+          if (trkl->GetDetector() != det)
+            AliError(Form("inconsistent assignment of tracklet 0x%08x in det %i to track in %i",
+              trkl->GetTrackletWord(), trkl->GetDetector(), det));
+          trdTrack->AddTrackletReference(trkl, iLayer);
+        }
+      }
+      // only add the track when it's complete (including tracklet references)
+      esd->AddTrdTrack(trdTrack);
+    }
+  }
+  esd->SetTrdTrigger(&fgTriggerFlags);
 
+  // ----- matching GTU tracks to global tracks -----
+  AliDebug(1, Form("TRD track matching with %i ESD, %i TRD tracks",
+                  esd->GetNumberOfTracks(), esd->GetNumberOfTrdTracks()));
+  fgOnlineTrackMatcher.ProcessEvent(esd);
 }
 
 //_____________________________________________________________________________
-void AliTRDReconstructor::FillESD(AliRunLoader* /*runLoader*/
-                               , AliRawReader* /*rawReader*/
-                               , AliESDEvent* /*esd*/) const
+void AliTRDReconstructor::SetOption(Option_t *opt)
 {
   //
-  // Make PID
+  // Read option string into the steer param.
   //
-
-  //AliTRDpidESD trdPID;
-  //trdPID.MakePID(esd);
-
+  // The following string options are available during reconstruction.
+  // In square brackets the default values are given.
+  //   "dc"  : digits conversion [false]
+  //   "cw"  : write clusters [true]
+  //   "tw"  : write online tracklets [false]
+  //   "sa"  : track seeding (stand alone tracking) [true]
+  //   "hlt" : HLT reconstruction [false]
+  //   "tp"  : also use online tracklets for reconstruction [false]
+  //   "deb" : Write debug stream [false]
+  //   "cc"  : Cluster radial correction during reconstruction [false]
+  //
+  // To check the actual options used during reconstruction include the following line in your rec.C script
+  // AliLog::SetClassDebugLevel("AliTRDReconstructor", 1);
+
+  AliReconstructor::SetOption(opt);
+
+  TString s(opt);
+  TObjArray *opar = s.Tokenize(",");
+  for(Int_t ipar=0; ipar<opar->GetEntriesFast(); ipar++){
+    Bool_t processed = kFALSE;
+    TString sopt(((TObjString*)(*opar)[ipar])->String());
+    for(Int_t iopt=0; iopt<kNsteer; iopt++){
+      if(!sopt.Contains(fgSteerFlags[iopt])) continue;
+      SETFLG(fSteerParam, BIT(iopt));
+      if(sopt.Contains("!")) CLRFLG(fSteerParam, BIT(iopt));
+      processed = kTRUE;
+      break;   
+    }
+    if(processed) continue;
+
+    AliWarning(Form("Unknown option flag %s.", sopt.Data()));
+  }
+  opar->Delete();
+  delete opar;
 }
 
 //_____________________________________________________________________________
-void AliTRDReconstructor::FillESD(AliRawReader* /*rawReader*/
-                               , TTree* /*clusterTree*/
-                               , AliESDEvent* /*esd*/) const
+void AliTRDReconstructor::Options(UInt_t steer)
 {
   //
-  // Make PID
+  // Print the options
   //
 
-  //AliTRDpidESD trdPID;
-  //trdPID.MakePID(esd);
-
+  for(Int_t iopt=0; iopt<kNsteer; iopt++){
+    AliDebugGeneral("AliTRDReconstructor", 1, Form(" %s[%s]%s", fgSteerNames[iopt], fgSteerFlags[iopt], steer ?(((steer>>iopt)&1)?" : ON":" : OFF"):""));
+  }
 }
 
+
 //_____________________________________________________________________________
-void AliTRDReconstructor::FillESD(TTree* /*digitsTree*/
-                               , TTree* /*clusterTree*/
-                               , AliESDEvent* /*esd*/) const
+TClonesArray* AliTRDReconstructor::GetClusters()
 {
-  //
-  // Make PID
-  //
-
-  //AliTRDpidESD trdPID;
-  //trdPID.MakePID(esd);
+// Build/ Retrieve cluster array
+  if(!fgClusters){
+    fgClusters = new TClonesArray("AliTRDcluster", Int_t(GetRecoParam()->GetNClusters()));
+    fgClusters->SetOwner();
+    AliInfoGeneral("AliTRDReconstructor", Form("Allocate cluster array @ %p", (void*)fgClusters));
+  }
+  return fgClusters;
+}
 
+//_____________________________________________________________________________
+TClonesArray* AliTRDReconstructor::GetTracklets(const char *trkltype)
+{
+// Build/ Retrieve online tracklets array
+
+  if (trkltype && strlen(trkltype) > 0) {
+    if(fgTracklets && (TClass::GetClass(trkltype) != fgTracklets->GetClass())){
+      fgTracklets->Delete();
+      delete fgTracklets;
+    }
+    if (!fgTracklets) {
+      fgTracklets = new TClonesArray(trkltype, 200);
+      fgTracklets->SetOwner(kTRUE);
+      AliInfoGeneral("AliTRDReconstructor", Form("Allocate online tracklets[%s] array @ %p", trkltype, (void*)fgTracklets));
+    }
+  }
+  return fgTracklets;
 }
 
 //_____________________________________________________________________________
-void AliTRDReconstructor::FillESD(AliRunLoader* /*runLoader*/
-                               , AliESDEvent* /*esd*/) const
+TClonesArray* AliTRDReconstructor::GetTracks()
 {
-  //
-  // Make PID
-  //
+// Build/ Retrieve cluster array
+  if(!fgTracks){
+    fgTracks = new TClonesArray("AliESDTrdTrack", 100);
+    fgTracks->SetOwner();
+    AliInfoGeneral("AliTRDReconstructor", Form("Allocate online tracks array @ %p", (void*)fgTracks));
+  }
+  return fgTracks;
+}
 
-  //AliTRDpidESD trdPID;
-  //trdPID.MakePID(esd);
+//_____________________________________________________________________________
+void AliTRDReconstructor::ResetContainers() const
+{
+// prepare data containers for a new event
 
+  if(fgClusters){
+    AliDebug(1, Form("Removing %5d clusters @ %p", fgClusters->GetEntriesFast(), (void*)fgClusters));
+    fgClusters->Clear();
+  }
+  if(fgTracklets){
+    AliDebug(1, Form("Removing %3d online tracklets @ %p", fgTracklets->GetEntriesFast(), (void*)fgTracklets));
+    fgTracklets->Clear();
+  }
+  if(fgTracks){
+    AliDebug(1, Form("Removing %3d online tracks @ %p", fgTracks->GetEntriesFast(), (void*)fgTracks));
+    fgTracks->Clear();
+  }
+  for (Int_t iSector = 0; iSector < 18; iSector++)
+    fgTriggerFlags.SetFlags(iSector, 0);
 }