/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/Utilities/StorageFactory/interface/LocalCacheFile.h

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#ifndef STORAGE_FACTORY_LOCAL_CACHE_FILE_H
# define STORAGE_FACTORY_LOCAL_CACHE_FILE_H

# include "Utilities/StorageFactory/interface/Storage.h"
# include "Utilities/StorageFactory/interface/File.h"
# include <vector>
# include <string>

class LocalCacheFile : public Storage
{
public:
  LocalCacheFile (Storage *base, const std::string &tmpdir = "");
  ~LocalCacheFile (void);

  using Storage::read;
  using Storage::write;

  virtual bool          prefetch (const IOPosBuffer *what, IOSize n);
  virtual IOSize        read (void *into, IOSize n);
  virtual IOSize        read (void *into, IOSize n, IOOffset pos);
  virtual IOSize        readv (IOBuffer *into, IOSize n);
  virtual IOSize        readv (IOPosBuffer *into, IOSize n);
  virtual IOSize        write (const void *from, IOSize n);
  virtual IOSize        write (const void *from, IOSize n, IOOffset pos);
  virtual IOSize        writev (const IOBuffer *from, IOSize n);
  virtual IOSize        writev (const IOPosBuffer *from, IOSize n);

  virtual IOOffset      position (IOOffset offset, Relative whence = SET);
  virtual void          resize (IOOffset size);
  virtual void          flush (void);
  virtual void          close (void);

private:
  void                  cache (IOOffset start, IOOffset end);

  IOOffset              image_;
  std::vector<char>     present_;
  File                  *file_;
  Storage               *storage_;
  bool                  closedFile_;
  unsigned int          cacheCount_;
  unsigned int          cacheTotal_;
};

#endif // STORAGE_FACTORY_LOCAL_CACHE_FILE_H