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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_MYRIAD_H
#define BU_CACHE_STORE_MYRIAD_H
#include "bu/string.h"
#include "bu/stream.h"
#include "bu/myriad.h"
#include "bu/cachestore.h"
#include "bu/myriadstream.h"
#include "bu/archive.h"
namespace Bu
{
template<class keytype, class obtype>
keytype __cacheGetKey( const obtype *pObj );
template<class keytype, class obtype>
obtype *__cacheStoreMyriadAlloc( const keytype &key )
{
return new obtype();
}
template<class keytype, class obtype>
void __cacheStoreMyriadStore( Bu::Stream &s, obtype &rObj,
const keytype & )
{
Bu::Archive ar( s, Bu::Archive::save );
ar << rObj;
}
template<class keytype, class obtype>
obtype *__cacheStoreMyriadLoad( Bu::Stream &s, const keytype &key )
{
obtype *pObj = __cacheStoreMyriadAlloc<keytype, obtype>( key );
Bu::Archive ar( s, Bu::Archive::load );
ar >> (*pObj);
return pObj;
}
template<class keytype, class obtype>
class CacheStoreMyriad : public CacheStore<keytype, obtype>
{
public:
CacheStoreMyriad( Bu::Stream &sArch,
int iBlockSize=512, int iPreAllocate=8 ) :
mStore( sArch, iBlockSize, iPreAllocate )
{
try
{
MyriadStream ns = mStore.openStream( 1 );
Bu::Archive ar( ns, Bu::Archive::load );
ar >> hId;
}
catch( Bu::MyriadException &e )
{
int iStream = mStore.createStream();
if( iStream != 1 )
throw Bu::ExceptionBase("That's...horrible...id = %d.\n\n",
iStream );
MyriadStream ns = mStore.openStream( 1 );
Bu::Archive ar( ns, Bu::Archive::save );
ar << hId;
}
}
virtual ~CacheStoreMyriad()
{
MyriadStream ns = mStore.openStream( 1 );
Bu::Archive ar( ns, Bu::Archive::save );
ar << hId;
}
virtual obtype *load( const keytype &key )
{
int iStream = hId.get( key );
MyriadStream ns = mStore.openStream( iStream );
obtype *pOb = __cacheStoreMyriadLoad<keytype, obtype>( ns, key );
return pOb;
}
virtual void unload( obtype *pObj, const keytype & )
{
delete pObj;
}
virtual keytype create( obtype *pSrc )
{
keytype key = __cacheGetKey<keytype, obtype>( pSrc );
int iStream = mStore.createStream();
hId.insert( key, iStream );
MyriadStream ns = mStore.openStream( iStream );
__cacheStoreMyriadStore<keytype, obtype>( ns, *pSrc, key );
ns.setSize( ns.tell() );
return key;
}
virtual void sync()
{
MyriadStream ns = mStore.openStream( 1 );
Bu::Archive ar( ns, Bu::Archive::save );
ar << hId;
ns.setSize( ns.tell() );
mStore.sync();
}
virtual void sync( obtype *pSrc, const keytype &key )
{
int iStream = hId.get( key );
MyriadStream ns = mStore.openStream( iStream );
__cacheStoreMyriadStore<keytype, obtype>( ns, *pSrc, key );
ns.setSize( ns.tell() );
}
virtual void destroy( obtype *pObj, const keytype &key )
{
int iStream = hId.get( key );
mStore.deleteStream( iStream );
hId.erase( key );
delete pObj;
}
virtual void destroy( const keytype &key )
{
int iStream = hId.get( key );
mStore.deleteStream( iStream );
hId.erase( key );
}
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:
Myriad mStore;
typedef Bu::Hash<keytype, long> StreamHash;
StreamHash hId;
};
};
#endif
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