library: libCore #include "TFilePrefetch.h" |
TFilePrefetch
class description - source file - inheritance tree (.pdf)
protected:
TFilePrefetch(const TFilePrefetch&)
TFilePrefetch& operator=(const TFilePrefetch&)
public:
TFilePrefetch()
TFilePrefetch(TFile* file, Int_t buffersize)
virtual ~TFilePrefetch()
static TClass* Class()
virtual TClass* IsA() const
virtual void Prefetch(Long64_t pos, Int_t len)
virtual void Print(Option_t* option = "") const
virtual Bool_t ReadBuffer(char* buf, Long64_t pos, Int_t len)
virtual void SetFile(TFile* file)
virtual void ShowMembers(TMemberInspector& insp, char* parent)
virtual void Sort()
virtual void Streamer(TBuffer& b)
void StreamerNVirtual(TBuffer& b)
protected:
Int_t fBufferSize Allocated size of fBuffer
Int_t fBufferLen Current buffer length (<= fBufferSize)
Int_t fNseek Number of blocks to be prefetched
Int_t fNtot Total size of prefetched blocks
Int_t fNb Number of long buffers
Int_t fSeekSize Allocated size of fSeek
Long64_t* fSeek [fNseek] Position on file of buffers to be prefetched
Long64_t* fSeekIndex [fNseek] sorted index table of fSeek
Long64_t* fSeekSort [fNseek] Position on file of buffers to be prefetched (sorted)
Long64_t* fPos [fNb] start of long buffers
Int_t* fSeekLen [fNseek] Length of buffers to be prefetched
Int_t* fSeekSortLen [fNseek] Length of buffers to be prefetched (sorted)
Int_t* fSeekPos [fNseek] Position of sorted blocks in fBuffer
Int_t* fLen [fNb] Length of long buffers
TFile* fFile Pointer to file
char* fBuffer [fBufferSize] buffer of contiguous prefetched blocks
Bool_t fIsSorted True if fSeek array is sorted
TFilePrefetch() : TObject()
Default Constructor.
TFilePrefetch(TFile *file, Int_t buffersize)
: TObject()
Creates a TFilePrefetch data structure.
TFilePrefetch(const TFilePrefetch &pf) : TObject(pf)
Copy Constructor.
~TFilePrefetch()
Destructor.
void Prefetch(Long64_t pos, Int_t len)
Add block of length len at position pos in the list of blocks to
be prefetched. If pos <= 0 the current blocks (if any) are reset.
void Print(Option_t *option) const
Print class internal structure.
Bool_t ReadBuffer(char *buf, Long64_t pos, Int_t len)
Read buffer at position pos.
If pos is in the list of prefetched blocks read from fBuffer,
otherwise normal read from file. Returns kTRUE in case of failure.
void SetFile(TFile *file)
set the file using this cache
void Sort()
Sort buffers to be prefetched in increasing order of positions.
Merge consecutive blocks if necessary.
Inline Functions
TFilePrefetch& operator=(const TFilePrefetch&)
TClass* Class()
TClass* IsA() const
void ShowMembers(TMemberInspector& insp, char* parent)
void Streamer(TBuffer& b)
void StreamerNVirtual(TBuffer& b)
Author: Rene Brun 18/05/2006
Last update: root/base:$Name: $:$Id: TFilePrefetch.cxx,v 1.5 2006/06/09 11:53:20 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
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