ObjCache.h

/* 
   EyeDB Object Database Management System
   Copyright (C) 1994-2008 SYSRA
   
   EyeDB 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 2.1 of the License, or (at your option) any later version.
   
   EyeDB 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 library; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA 
*/

/*
   Author: Eric Viara <viara@sysra.com>
*/


#ifndef _EYEDB_OBJ_CACHE_H
#define _EYEDB_OBJ_CACHE_H

namespace eyedb {

  struct ObjCacheLink;

  class ObjCache {

  public:
    ObjCache(unsigned int n = 8);

    Bool insertObject(const Oid &oid, void *o, unsigned int refcnt = 0);

    Bool deleteObject(const Oid &oid, bool force = false);

    void *getObject(const Oid &oid, bool incr = false);

    ObjectList *getObjects();

    void empty();

    unsigned int getObjectCount() {return obj_cnt;}

    ~ObjCache();

  private:
    unsigned int key;
    unsigned int links_cnt;
    unsigned int obj_cnt;
    ObjCacheLink **links;
    unsigned int getIndex(const Oid&);
    unsigned int tstamp;
    bool rescaling;
    void rescale();
  };

}

#endif

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