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/* xblock.h
Xbase project source code
This file conatains a header file for the xbLock virtual objects which
is used for controlling file and record locking. Record and file
locking has been rewritten in version 3.
Copyright (C) 1997,2003 Gary A Kunkel
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact:
Email:
xdb-devel@lists.sourceforge.net
xdb-users@lists.sourceforge.net
Regular Mail:
XBase Support
149C South Main St
Keller Texas, 76248
USA
*/
/*! \file xblock.h
*/
#ifndef __XB_XBLOCK_H__
#define __XB_XBLOCK_H__
#ifdef __GNU LesserG__
#pragma interface
#endif
#ifdef XB_LOCKING_ON
//! xbLock class
/*!
*/
class XBDLLEXPORT xbLock
{
public:
xbLock( xbDbf * dbf );
virtual ~xbLock();
virtual xbShort LockTableHeader( xbShort LockType ) = 0;
virtual xbShort LockTable( xbShort LockType ) = 0;
virtual xbShort LockRecord( xbShort LockType, xbULong RecNo, xbOffT len ) = 0;
virtual xbShort LockMemo( xbShort LockType ) = 0;
virtual xbShort LockIndex( xbShort LockType ) = 0;
virtual xbShort UnlockAll() = 0;
virtual xbShort LockInit() { return XB_NO_ERROR; }
protected:
xbDbf *dbf;
xbShort HdrLockCnt;
xbShort TableLockCnt;
xbShort MemoLockCnt;
xbShort IndexLockCnt;
xbShort LockFile( int fn, xbShort LockType, xbOffT lockLen );
};
class XBDLLEXPORT xbaseLock : xbLock
{
public:
xbaseLock( xbDbf * pdbf );
virtual ~xbaseLock() {}
virtual xbShort LockTableHeader( xbShort LockType );
virtual xbShort LockTable( xbShort LockType );
virtual xbShort LockRecord( xbShort LockType, xbULong RecNo, xbOffT len );
virtual xbShort LockMemo( xbShort LockType );
virtual xbShort LockIndex( xbShort LockType );
virtual xbShort UnlockAll();
virtual xbShort LockInit();
private:
FILE *lfh; /* lock file handle */
};
class XBDLLEXPORT dbaseLock : xbLock
{
public:
dbaseLock( xbDbf * pdbf );
virtual ~dbaseLock() {}
virtual xbShort LockTableHeader( xbShort LockType );
virtual xbShort LockTable( xbShort LockType );
virtual xbShort LockRecord( xbShort LockType, xbULong RecNo, xbOffT len );
virtual xbShort LockMemo( xbShort LockType );
virtual xbShort LockIndex( xbShort LockType );
virtual xbShort UnlockAll();
};
class XBDLLEXPORT clipperLock : xbLock
{
public:
clipperLock( xbDbf * pdbf );
virtual ~clipperLock() {}
virtual xbShort LockTableHeader( xbShort LockType );
virtual xbShort LockTable( xbShort LockType );
virtual xbShort LockRecord( xbShort LockType, xbULong RecNo, xbOffT len );
virtual xbShort LockMemo( xbShort LockType );
virtual xbShort LockIndex( xbShort LockType );
virtual xbShort UnlockAll();
};
class XBDLLEXPORT foxproLock : xbLock
{
public:
foxproLock( xbDbf * pdbf );
virtual ~foxproLock() {}
virtual xbShort LockTableHeader( xbShort LockType );
virtual xbShort LockTable( xbShort LockType );
virtual xbShort LockRecord( xbShort LockType, xbULong RecNo, xbOffT len );
virtual xbShort LockMemo( xbShort LockType );
virtual xbShort LockIndex( xbShort LockType );
virtual xbShort UnlockAll();
};
class XBDLLEXPORT noLock : xbLock
{
public:
noLock( xbDbf * pdbf ) : xbLock( pdbf ) {};
virtual ~noLock() {}
virtual xbShort LockTableHeader( xbShort LockType )
{ return XB_NO_ERROR; }
virtual xbShort LockTable( xbShort LockType )
{ return XB_NO_ERROR; }
virtual xbShort LockRecord( xbShort LockType, xbULong RecNo )
{ return XB_NO_ERROR; }
virtual xbShort LockMemo( xbShort LockType )
{ return XB_NO_ERROR; }
virtual xbShort LockIndex( xbShort LockType )
{ return XB_NO_ERROR; }
virtual xbShort UnlockAll()
{ return XB_NO_ERROR; }
};
#endif // XB_LOCKING_ON
#endif // __XB_XBLOCK_H__
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