12 #ifndef ROOT_TTreeCache 13 #define ROOT_TTreeCache 24 #ifndef ROOT_TFileCacheRead 27 #ifndef ROOT_TObjArray Long64_t fEntryMax
! last entry in the cache
Bool_t IsAutoCreated() const
Int_t fNReadOk
Number of blocks read and found in the cache.
const TObjArray * GetCachedBranches() const
TObjArray * fBranches
! List of branches to be stored in the cache
A cache when reading files over the network.
Bool_t fOneTime
! used in the learning phase
virtual void SetLearnPrefill(EPrefillType type=kNoPrefill)
Set whether the learning period is started with a prefilling of the cache and which type of prefillin...
A specialized TFileCacheRead object for a TTree.
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format...
Long64_t fEntryMin
! first entry in the cache
virtual void StopLearningPhase()
This is the counterpart of StartLearningPhase() and can be used to stop the learning phase...
virtual void LearnPrefill()
Perform an initial prefetch, attempting to read as much of the learning phase baskets for all branche...
void SetAutoCreated(Bool_t val)
void StartLearningPhase()
The name should be enough to explain the method.
virtual Int_t AddBranch(TBranch *b, Bool_t subgbranches=kFALSE)
Add a branch to the list of branches to be stored in the cache this function is called by TBranch::Ge...
Bool_t fAutoCreated
! true if cache was automatically created
virtual void Print(Option_t *option="") const
Print cache statistics.
virtual Int_t ReadBufferNormal(char *buf, Long64_t pos, Int_t len)
Old method ReadBuffer before the addition of the prefetch mechanism.
#define ClassDef(name, id)
virtual EPrefillType GetLearnPrefill() const
virtual Bool_t IsEnabled() const
EPrefillType GetConfiguredPrefillType() const
Return the desired prefill type from the environment or resource variable.
virtual Bool_t IsLearning() const
virtual Int_t ReadBuffer(char *buf, Long64_t pos, Int_t len)
Read buffer at position pos if the request is in the list of prefetched blocks read from fBuffer...
virtual void ResetCache()
This will simply clear the cache.
Bool_t fEnabled
! cache enabled for cached reading
TTree * fTree
! pointer to the current Tree
Double_t GetEfficiency() const
Give the total efficiency of the cache...
virtual void SetEntryRange(Long64_t emin, Long64_t emax)
Set the minimum and maximum entry number to be processed this information helps to optimize the numbe...
virtual Int_t DropBranch(TBranch *b, Bool_t subbranches=kFALSE)
Remove a branch to the list of branches to be stored in the cache this function is called by TBranch:...
virtual Int_t ReadBufferPrefetch(char *buf, Long64_t pos, Int_t len)
Used to read a chunk from a block previously fetched.
virtual ~TTreeCache()
Destructor. (in general called by the TFile destructor)
Bool_t fReadDirectionSet
! read direction established
TTreeCache & operator=(const TTreeCache &)
Int_t fNReadMiss
Number of blocks read and not found in the cache.
static void SetLearnEntries(Int_t n=10)
Static function to set the number of entries to be used in learning mode The default value for n is 1...
virtual Bool_t FillBuffer()
Fill the cache buffer with the branches in the cache.
Int_t fNReadPref
Number of blocks that were prefetched.
Bool_t fReverseRead
! reading in reverse mode
Bool_t fFirstTime
! save the fact that we processes the first entry
Long64_t fEntryCurrent
! current lowest entry number in the cache
TTreeCache()
Default Constructor.
Bool_t fIsLearning
! true if cache is in learning mode
virtual void SetFile(TFile *file, TFile::ECacheAction action=TFile::kDisconnect)
Overload to make sure that the object specific.
EPrefillType fPrefillType
Whether a pre-filling is enabled (and if applicable which type)
Int_t fFillTimes
! how many times we can fill the current buffer
virtual Int_t GetEntryMin() const
virtual Int_t SetBufferSize(Int_t buffersize)
Change the underlying buffer size of the cache.
Int_t fNbranches
! Number of branches in the cache
Long64_t fFirstEntry
! save the value of the first entry
TList * fBrNames
! list of branch names in the cache
you should not use this method at all Int_t Int_t Double_t Double_t Double_t Int_t Double_t Double_t Double_t Double_t b
Bool_t fFirstBuffer
! true if first buffer is used for prefetching
static Int_t fgLearnEntries
number of entries used for learning mode
A TTree object has a header with a name and a title.
Bool_t fIsManual
! true if cache is StopLearningPhase was used
A TTree is a list of TBranches.
Long64_t fEntryNext
! next entry number where cache must be filled
Double_t GetEfficiencyRel() const
This will indicate a sort of relative efficiency...
virtual void UpdateBranches(TTree *tree)
Update pointer to current Tree and recompute pointers to the branches in the cache.
virtual Int_t GetEntryMax() const
static Int_t GetLearnEntries()
Static function returning the number of entries used to train the cache see SetLearnEntries.
ECacheAction
TTreeCache flushing semantics.