TCache

class TCache : public TObject

    private:

               Int_t FlushList(TList* list)
               Int_t FlushNew()
               Int_t Free(ULong_t upto)
      TCache::TPage* ReadPage(Seek_t offset)
                void SetPageSize(Int_t size)
               Int_t WritePage(TCache::TPage* page)

    public:

                      TCache(const TCache&)
                      TCache(Int_t maxCacheSize, TFile* file, Int_t pageSize = kDfltPageSize)
              virtual ~TCache()
       static TClass* Class()
                Int_t Flush()
                Int_t GetActiveCacheSize() const
                Int_t GetLowLevel() const
                Int_t GetMaxCacheSize() const
                Int_t GetPageSize() const
      virtual TClass* IsA() const
                Int_t ReadBuffer(Seek_t offset, char* buf, Int_t len)
                Int_t Resize(Int_t maxCacheSize)
                 void SetLowLevel(Int_t percentOfHigh)
         virtual void ShowMembers(TMemberInspector& insp, char* parent)
         virtual void Streamer(TBuffer& b)
                 void StreamerNVirtual(TBuffer& b)
                Int_t WriteBuffer(Seek_t offset, const char* buf, Int_t len)

Data Members

    private:

      TCache::TCacheList* fCache      hash list containing cached pages
             TSortedList* fNew        list constaining new pages that have to be written to disk
                   TList* fFree       list containing unused pages
                   TFile* fFile       file for which pages are being cached
                   Seek_t fEOF        end of file
                  ULong_t fHighWater  high water mark (i.e. maximum cache size in bytes)
                  ULong_t fLowWater   low water mark (free pages till low water mark is reached)
                    Int_t fPageSize   size of cached pages
                    Int_t fLowLevel   low water mark is at low level percent of high
                    Int_t fDiv        page size divider
                   Bool_t fRecursive  true to prevent recusively calling ReadBuffer()

    public:

      static const enum TCache:: kDfltPageSize  
      static const enum TCache:: kDfltLowLevel  

Class Description