//-----------------------------------------------------------------------------
//
// File and Version Information:
// 	$Id: BdbConfigCache.hh,v 1.1 1998/01/15 08:32:50 yury Exp $
//
// Description:
//	Class BdbConfigCache: caches a configuration database 
//      object for repeated access. This is a pure virtual class.
//
// Environment:
//	Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author List:
//	David R. Quarrie		Original Author (BdbCache)
//      Dave Brown, LBL                 Move database,class,key to constructor,
//                                      clean up the fetch interface
//      Yury Kolomensky, Caltech        clone
// Copyright Information:
//	Copyright (C) 1994, 1995	Lawrence Berkeley Laboratory
//
//-----------------------------------------------------------------------------
#ifndef BDBCONFIGCACHE_HH
#define BDBCONFIGCACHE_HH

//-----------------------
// Base Class Headers --
//-----------------------

//-------------------------------
// Collaborating Class Headers --
//-------------------------------
#include "BdbConfig/BdbConfigObject.hh"
#include "BdbUtil/BdbIfdHandle.hh"

#include "rw/cstring.h"

//------------------------------------
// Collaborating Class Declarations --
//------------------------------------
class BdbConfigKey;

//		---------------------
// 		-- Class Interface --
//		---------------------
class BdbConfigCache {
public:
  // Constructor
  BdbConfigCache(const char* theClassName);

  // Destructor
  virtual ~BdbConfigCache( );

  // method to test the cache
  virtual bool isCacheValid(const BdbConfigKey& theKey )=0;

  // this method is type-safe
  BdbIfdHandle<BdbConfigObject>& ifdFetch( const BdbConfigKey& theKey );

  //  Access the relevant strings
  const RWCString& className() const { return _className; }

protected:
  // Fetch the object, given the ConfigKey.  
  virtual BdbHandle(BdbConfigObject) fetch( const BdbConfigKey& theKey )=0;

  // Data members
  RWCString            _className;            // class name
  BdbIfdHandle<BdbConfigObject> _object;      // pointer to handle to object

};

#endif