RFIOFile.h

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#ifndef RFIO_ADAPTOR_RFIO_FILE_H
#define RFIO_ADAPTOR_RFIO_FILE_H

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

class RFIOFile : public Storage
{
public:
  RFIOFile (void);
  RFIOFile (IOFD fd);
  RFIOFile (const char *name, int flags = IOFlags::OpenRead, int perms = 0666);
  RFIOFile (const std::string &name, int flags = IOFlags::OpenRead, int perms = 0666);
  ~RFIOFile (void);

  virtual void      create (const char *name,
                bool exclusive = false,
                int perms = 0666);
  virtual void      create (const std::string &name,
                bool exclusive = false,
                int perms = 0666);
  virtual void      open (const char *name,
                  int flags = IOFlags::OpenRead,
                  int perms = 0666);
  virtual void      open (const std::string &name,
                  int flags = IOFlags::OpenRead,
                  int perms = 0666);

  using Storage::read;
  using Storage::readv;
  using Storage::write;
  using Storage::position;

  virtual IOSize    read (void *into, IOSize n);
  virtual IOSize    readv (IOPosBuffer *into, IOSize buffers);
  virtual IOSize    write (const void *from, IOSize n);
  virtual IOOffset  position (IOOffset offset, Relative whence = SET);
  virtual void      resize (IOOffset size);
  virtual void      close (void);
  virtual void      abort (void);

/*
 * Note: we used to implement prefetch for RFIOFile, but it never got used in
 * production due to memory leaks in the underlying library.  This was removed
 * in CMSSW 6 so we could default to storage-only if available.
 */

private:
  ssize_t       retryRead (void *into, IOSize n, int maxRetry = 10);
  void          reopen();

  IOFD          m_fd;
  bool          m_close;
  std::string       m_name;
  int           m_flags;
  int           m_perms;
  IOOffset              m_curpos;
};

#endif // RFIO_ADAPTOR_RFIO_FILE_H