DbLockTable.H

/* DbLockTable.H */
/* $Id: DbLockTable.H,v 1.4 2004/09/01 11:53:58 ibadm Exp $ */
#ifndef __DbLockTable_H
#define __DbLockTable_H

#include <mix/Lock.H>
#include <mix/FileLock.H>
#include <ldb/DbTable.H>
#include <ldb/DbName.H>
#include <ldb/dblocks.h>


class DbLTName :
  public DbName /* file name of lock's table is derived from dbname */
{
public:

  DbLTName (const dbNameStruct& dbns);
  DbLTName (const char* szFileName);

  const char*   exclock_fname () const;

  const char*   shalock_fname () const;


  const char*   exclock_fpath (const char* project = NULL);

  const char*   shalock_fpath (const char* project = NULL);

protected:

  virtual void  rebuild_fname ();

private:

  char  shared_fname[DB_FILE_NAME_LEN + sizeof(DB_LOCK_SHARED_FNAME_EXT) + 1];

  char  *shared_fpath;

  char  exclus_fname[DB_FILE_NAME_LEN + sizeof(DB_LOCK_EXCL_FNAME_EXT) + 1];

  char  *exclus_fpath;

};


class DbLockTable :
  public DbLTName,  /* name of the table objects */
  public FileLock,  /* lock lock's table exclusively */
  public DbTable    /* read it as a data base table */
{
public:

  DbLockTable (const char* project, const dbNameStruct& dbns);
  DbLockTable (const char* project, const char* szDbFileName);

  virtual ~DbLockTable ();

  ErrCode   add_lock (LockId& glid, DbAccess dbac);

  ErrCode   delete_lock (LockId glid);

  DbIndex   find_lock (LockId glid);

  DbIndex   find_lock ();

  static const char*    dbac2symb (DbAccess dbac);

  static DbAccess   symb2dbac (const char* s);

private:

  int       sha_fd;

  void      load_table ();

  void      save_table ();

};


#endif /* DbLockTable.H */