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/*
* Copyright (C) 2007-2010 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_CACHE_STORE_NIDS_H
#define BU_CACHE_STORE_NIDS_H
#include "bu/fstring.h"
#include "bu/stream.h"
#include "bu/nids.h"
#include "bu/nidsstream.h"
#include "bu/cachestore.h"
#include "bu/file.h"
#include "bu/archive.h"
namespace Bu
{
template<class keytype, class obtype>
keytype __cacheGetKey( const obtype *pObj );
template<class keytype, class obtype>
obtype *__cacheStoreNidsAlloc( const keytype &key )
{
return new obtype();
}
template<class keytype, class obtype>
void __cacheStoreNidsStore( Bu::Stream &s, obtype &rObj,
const keytype & )
{
Bu::Archive ar( s, Bu::Archive::save );
ar << rObj;
}
template<class keytype, class obtype>
obtype *__cacheStoreNidsLoad( Bu::Stream &s, const keytype &key )
{
obtype *pObj = __cacheStoreNidsAlloc<keytype, obtype>( key );
Bu::Archive ar( s, Bu::Archive::load );
ar >> (*pObj);
return pObj;
}
template<class keytype, class obtype>
class CacheStoreNids : public CacheStore<keytype, obtype>
{
public:
CacheStoreNids( Bu::Stream &sArch,
int iBlockSize=1024, int iPreAllocate=1 ) :
nStore( sArch )
{
try
{
nStore.initialize();
NidsStream ns = nStore.openStream( 0 );
Bu::Archive ar( ns, Bu::Archive::load );
ar >> hId;
}
catch( Bu::NidsException &e )
{
nStore.initialize( iBlockSize, iPreAllocate );
int iStream = nStore.createStream();
if( iStream != 0 )
throw Bu::ExceptionBase("That's...horrible...id = %d.\n\n", iStream );
NidsStream ns = nStore.openStream( 0 );
Bu::Archive ar( ns, Bu::Archive::save );
ar << hId;
}
}
virtual ~CacheStoreNids()
{
NidsStream ns = nStore.openStream( 0 );
Bu::Archive ar( ns, Bu::Archive::save );
ar << hId;
}
virtual obtype *load( const keytype &key )
{
int iStream = hId.get( key );
NidsStream ns = nStore.openStream( iStream );
obtype *pOb = __cacheStoreNidsLoad<keytype, obtype>( ns, key );
return pOb;
}
virtual void unload( obtype *pObj, const keytype &key )
{
delete pObj;
}
virtual keytype create( obtype *pSrc )
{
keytype key = __cacheGetKey<keytype, obtype>( pSrc );
int iStream = nStore.createStream();
hId.insert( key, iStream );
NidsStream ns = nStore.openStream( iStream );
__cacheStoreNidsStore<keytype, obtype>( ns, *pSrc, key );
return key;
}
virtual void sync()
{
NidsStream ns = nStore.openStream( 0 );
Bu::Archive ar( ns, Bu::Archive::save );
ar << hId;
}
virtual void sync( obtype *pSrc, const keytype &key )
{
int iStream = hId.get( key );
NidsStream ns = nStore.openStream( iStream );
__cacheStoreNidsStore<keytype, obtype>( ns, *pSrc, key );
}
virtual void destroy( obtype *pObj, const keytype &key )
{
int iStream = hId.get( key );
nStore.deleteStream( iStream );
hId.erase( key );
delete pObj;
sync();
}
virtual void destroy( const keytype &key )
{
int iStream = hId.get( key );
nStore.deleteStream( iStream );
hId.erase( key );
sync();
}
virtual bool has( const keytype &key )
{
return hId.has( key );
}
virtual Bu::List<keytype> getKeys()
{
return hId.getKeys();
}
virtual int getSize()
{
return hId.getSize();
}
private:
Nids nStore;
typedef Bu::Hash<keytype, long> NidHash;
NidHash hId;
};
};
#endif
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