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// --------------------------------------------------------------------------
//
// File
// Name: RaidFileWrite.h
// Purpose: Writing RAID like files
// Created: 2003/07/10
//
// --------------------------------------------------------------------------
#ifndef RAIDFILEWRITE__H
#define RAIDFILEWRITE__H
#include <string>
#include "IOStream.h"
class RaidFileDiscSet;
// --------------------------------------------------------------------------
//
// Class
// Name: RaidFileWrite
// Purpose: Writing RAID like files
// Created: 2003/07/10
//
// --------------------------------------------------------------------------
class RaidFileWrite : public IOStream
{
public:
// TODO FIXME we should remove this constructor, and ensure that
// anyone who writes to a RaidFile knows what the reference count
// is before doing so. That requires supporting regenerating the
// reference count database in BackupStoreCheck, and using a real
// database instead of an in-memory array in HousekeepStoreAccount,
// and supporting multiple databases at a time (old and new) in
// BackupStoreRefCountDatabase, and I don't have time to make those
// changes right now. We may even absolutely need to have a full
// reference database, not just reference counts, to implement
// snapshots.
RaidFileWrite(int SetNumber, const std::string &Filename);
RaidFileWrite(int SetNumber, const std::string &Filename, int refcount);
~RaidFileWrite();
private:
RaidFileWrite(const RaidFileWrite &rToCopy);
public:
// IOStream interface
virtual int Read(void *pBuffer, int NBytes, int Timeout = IOStream::TimeOutInfinite); // will exception
virtual void Write(const void *pBuffer, int NBytes,
int Timeout = IOStream::TimeOutInfinite);
virtual pos_type GetPosition() const;
virtual void Seek(pos_type Offset, int SeekType);
virtual void Close(); // will discard the file! Use commit instead.
virtual bool StreamDataLeft();
virtual bool StreamClosed();
// Extra bits
void Open(bool AllowOverwrite = false);
void Commit(bool ConvertToRaidNow = false);
void Discard();
void TransformToRaidStorage();
void Delete();
pos_type GetFileSize();
pos_type GetDiscUsageInBlocks();
static void CreateDirectory(int SetNumber, const std::string &rDirName, bool Recursive = false, int mode = 0777);
static void CreateDirectory(const RaidFileDiscSet &rSet, const std::string &rDirName, bool Recursive = false, int mode = 0777);
private:
int mSetNumber;
std::string mFilename, mTempFilename;
int mOSFileHandle;
int mRefCount;
};
#endif // RAIDFILEWRITE__H
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