00001 // @(#)root/tree:$Id: TTreeCache.h 34935 2010-08-23 09:13:37Z brun $ 00002 // Author: Rene Brun 04/06/2006 00003 00004 /************************************************************************* 00005 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. * 00006 * All rights reserved. * 00007 * * 00008 * For the licensing terms see $ROOTSYS/LICENSE. * 00009 * For the list of contributors see $ROOTSYS/README/CREDITS. * 00010 *************************************************************************/ 00011 00012 #ifndef ROOT_TTreeCache 00013 #define ROOT_TTreeCache 00014 00015 00016 ////////////////////////////////////////////////////////////////////////// 00017 // // 00018 // TTreeCache // 00019 // // 00020 // Specialization of TFileCacheRead for a TTree // 00021 // // 00022 ////////////////////////////////////////////////////////////////////////// 00023 00024 #ifndef ROOT_TFileCacheRead 00025 #include "TFileCacheRead.h" 00026 #endif 00027 #ifndef ROOT_TObjArray 00028 #include "TObjArray.h" 00029 #endif 00030 00031 class TTree; 00032 class TBranch; 00033 00034 class TTreeCache : public TFileCacheRead { 00035 00036 protected: 00037 Long64_t fEntryMin; //! first entry in the cache 00038 Long64_t fEntryMax; //! last entry in the cache 00039 Long64_t fEntryCurrent;//! current lowest entry number in the cache 00040 Long64_t fEntryNext; //! next entry number where cache must be filled 00041 Long64_t fZipBytes; //! Total compressed size of branches in cache 00042 Int_t fNbranches; //! Number of branches in the cache 00043 Int_t fNReadOk; //Number of blocks read and found in the cache 00044 Int_t fNReadMiss; //Number of blocks read and not found in the chache 00045 Int_t fNReadPref; //Number of blocks that were prefetched 00046 TObjArray *fBranches; //! List of branches to be stored in the cache 00047 TList *fBrNames; //! list of branch names in the cache 00048 TTree *fOwner; //! pointer to the owner Tree/chain 00049 TTree *fTree; //! pointer to the current Tree 00050 Bool_t fIsLearning; //! true if cache is in learning mode 00051 Bool_t fIsManual; //! true if cache is StopLearningPhase was used 00052 static Int_t fgLearnEntries; //Number of entries used for learning mode 00053 00054 private: 00055 TTreeCache(const TTreeCache &); //this class cannot be copied 00056 TTreeCache& operator=(const TTreeCache &); 00057 00058 public: 00059 TTreeCache(); 00060 TTreeCache(TTree *tree, Int_t buffersize=0); 00061 virtual ~TTreeCache(); 00062 virtual void AddBranch(TBranch *b, Bool_t subbranches = kFALSE); 00063 virtual void AddBranch(const char *branch, Bool_t subbranches = kFALSE); 00064 Double_t GetEfficiency() const; 00065 Double_t GetEfficiencyRel() const; 00066 static Int_t GetLearnEntries(); 00067 00068 virtual Bool_t FillBuffer(); 00069 TTree *GetOwner() const; 00070 TTree *GetTree() const; 00071 virtual Bool_t IsLearning() const {return fIsLearning;} 00072 virtual void Print(Option_t *option="") const; 00073 virtual Int_t ReadBuffer(char *buf, Long64_t pos, Int_t len); 00074 virtual void ResetCache(); 00075 virtual void SetEntryRange(Long64_t emin, Long64_t emax); 00076 static void SetLearnEntries(Int_t n = 10); 00077 void StartLearningPhase(); 00078 virtual void StopLearningPhase(); 00079 virtual void UpdateBranches(TTree *tree, Bool_t owner = kFALSE); 00080 00081 ClassDef(TTreeCache,2) //Specialization of TFileCacheRead for a TTree 00082 }; 00083 00084 #endif
1.5.1