ANALYSIS/AliAnalysisSelector.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  17 // Author: Andrei Gheata, 31/05/2006
  18
  19 //==============================================================================
  20 //   AliAnalysisSelector - A transparent selector to be created by
  21 // AliAnalysisManager to handle analysis.
  22 //==============================================================================
  23
  24 #include "Riostream.h"
  25
  26 #include "AliAnalysisManager.h"
  27 #include "AliAnalysisTask.h"
  28 #include "AliAnalysisDataContainer.h"
  29 #include "AliAnalysisSelector.h"
  30
  31 ClassImp(AliAnalysisSelector)
  32
  33 //______________________________________________________________________________
  34 AliAnalysisSelector::AliAnalysisSelector(AliAnalysisManager *mgr)
  35                     :TSelector(),
  36                      fInitialized(kFALSE),
  37                      fAnalysis(mgr)
  38 {
  39 // Constructor. Called by AliAnalysisManager which registers itself on the
  40 // selector running on the master.
  41 }
  42
  43 //______________________________________________________________________________
  44 AliAnalysisSelector::~AliAnalysisSelector()
  45 {
  46 // Dtor. The analysis manager object is sent in the input list and duplicated
  47 // on the workers - it needs to be deleted (?)
  48 //   if (fAnalysis) delete fAnalysis;
  49 }
  50
  51 //______________________________________________________________________________
  52 void AliAnalysisSelector::Init(TTree *tree)
  53 {
  54 // Called after Begin/SlaveBegin, assumes that fAnalysis is already initialized.
  55 // Is Init called on workers in case of PROOF.
  56    if (!fAnalysis) {
  57       Error("Init", "Analysis manager NULL !");
  58       return;
  59    }
  60    if (!tree) {
  61       Error("Init", "Input tree is NULL !");
  62       return;
  63    }
  64    fAnalysis->Init(tree);
  65    fInitialized = kTRUE;
  66 }
  67
  68 //______________________________________________________________________________
  69 void AliAnalysisSelector::Begin(TTree *)
  70 {
  71 // Assembly the input list.
  72    RestoreAnalysisManager();
  73 }
  74
  75 //______________________________________________________________________________
  76 void AliAnalysisSelector::SlaveBegin(TTree *tree)
  77 {
  78 // Called on each worker. We "unpack" analysis manager here and call InitAnalysis.
  79    RestoreAnalysisManager();
  80    if (fAnalysis) fAnalysis->SlaveBegin(tree);
  81 }
  82
  83 //______________________________________________________________________________
  84 Bool_t AliAnalysisSelector::Process(Long64_t entry)
  85 {
  86 // Event loop.
  87    if (fAnalysis->GetDebugLevel() >1 ) {
  88       printf("AliAnalysisSelector::Process()\n");
  89    }
  90    fAnalysis->GetEntry(entry); // Not needed anymore in version 2
  91    fAnalysis->ExecAnalysis();
  92    return kTRUE;
  93 }
  94
  95 //______________________________________________________________________________
  96 void AliAnalysisSelector::RestoreAnalysisManager()
  97 {
  98 // Restores analysis manager from the input list.
  99    if (!fAnalysis) {
 100       TIter next(fInput);
 101       TObject *obj;
 102       while ((obj=next())) {
 103          if (obj->IsA() == AliAnalysisManager::Class()) {
 104             fAnalysis = (AliAnalysisManager*)obj;
 105             break;
 106          }
 107       }
 108       if (!fAnalysis) {
 109          Error("SlaveBegin", "Analysis manager not found in the input list");
 110          return;
 111       }
 112    }
 113 }
 114
 115 //______________________________________________________________________________
 116 void AliAnalysisSelector::SlaveTerminate()
 117 {
 118   // The SlaveTerminate() function is called after all entries or objects
 119   // have been processed. When running with PROOF SlaveTerminate() is called
 120   // on each slave server.
 121    if (fAnalysis->GetDebugLevel() >1 ) {
 122       printf("AliAnalysisSelector::SlaveTerminate()\n");
 123    }
 124    fAnalysis->PackOutput(fOutput);
 125 }
 126
 127 //______________________________________________________________________________
 128 void AliAnalysisSelector::Terminate()
 129 {
 130   // The Terminate() function is the last function to be called during
 131   // a query. It always runs on the client, it can be used to present
 132   // the results graphically or save the results to file.
 133    if (!fAnalysis) {
 134       Error("Terminate","AliAnalysisSelector::Terminate: No analysisManager!!!");
 135       return;
 136    }
 137    if (fAnalysis->GetDebugLevel() >1 ) {
 138       printf("AliAnalysisSelector::Terminate()\n");
 139    }
 140    fAnalysis->UnpackOutput(fOutput);
 141    fAnalysis->Terminate();
 142 }