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#include <bu/archive.h>
#include <bu/hash.h>
#include <bu/uuid.h>
#include <bu/myriad.h>
#include <bu/myriadstream.h>
#include <bu/file.h>
#include <bu/streamstack.h>
//
// New Cache Implementation
//
template<typename keytype, typename obtype> class CacheBase;
template<typename keytype, typename obtype>
class CacheObject
{
friend class CacheBase<keytype, obtype>;
public:
CacheObject() :
pCache( NULL ),
bChanged( false )
{
}
virtual ~CacheObject()
{
}
typedef CacheBase<keytype, obtype> CacheType;
virtual const keytype getKey() const=0;
virtual const int getPersistenceScore() const { return 0; }
void changed( bool bChanged=true )
{
if( this->bChanged == false && bChanged == true )
pCache->objectChanged( getKey() );
this->bChanged = bChanged;
}
private:
void setCache( CacheType *pCache )
{
this->pCache = pCache;
}
private:
CacheType *pCache;
bool bChanged;
};
template<typename keytype, typename obtype, typename basetype=obtype>
class CachePtr
{
friend class CacheBase<keytype, basetype>;
public:
CachePtr()
{
}
virtual ~CachePtr()
{
}
};
template<typename keytype, typename obtype>
class CacheBase
{
public:
CacheBase()
{
}
virtual ~CacheBase()
{
}
protected:
virtual void _create( obtype *o )=0;
virtual void _erase( const keytype &k )=0;
virtual obtype *_load( const keytype &k )=0;
virtual void _save( obtype *o )=0;
};
template<typename keytype, typename obtype>
class MyriadCache : public CacheBase<keytype, obtype>
{
public:
MyriadCache( Bu::Stream &sStore, int iBlockSize=512, int iPreallocate=8 ) :
sStore( sStore ),
mStore( sStore, iBlockSize, iPreallocate )
{
try
{
Bu::MyriadStream ms = mStore.openStream( 1 );
Bu::Archive ar( ms, Bu::Archive::load );
ar >> hIndex;
}
catch(...)
{
if( mStore.createStreamWithId( 1 ) != 1 )
throw Bu::ExceptionBase("Error creating index stream.");
Bu::MyriadStream ms = mStore.openStream( 1 );
Bu::Archive ar( ms, Bu::Archive::save );
ar << hIndex;
}
}
virtual ~MyriadCache()
{
}
protected:
virtual void _create( obtype *o )
{
hIndex.insert( o->getKey(), mStore.createStream() );
_save( o );
}
virtual void _erase( const keytype &k )
{
mStore.deleteStream( hIndex.get( k ) );
hIndex.erase( k );
}
virtual obtype *_load( const keytype &k )
{
Bu::MyriadStream ms = mStore.openStream( hIndex.get( k ) );
Bu::Archive ar( ms, Bu::Archive::load );
obtype *ret = new obtype();
ar >> *ret;
return ret;
}
virtual void _save( obtype *o )
{
Bu::MyriadStream ms = mStore.openStream( hIndex.get( o->getKey() ) );
{
Bu::Archive ar( ms, Bu::Archive::save );
ar << *o;
}
ms.setSize( ms.tell() );
}
private:
Bu::Stream &sStore;
Bu::Myriad mStore;
Bu::Hash<keytype, int> hIndex;
};
//
// Test
//
class Something : public CacheObject<Bu::Uuid, Something>
{
friend Bu::ArchiveBase &operator>>( Bu::ArchiveBase &ar, Something &s );
friend Bu::ArchiveBase &operator<<( Bu::ArchiveBase &ar, const Something &s );
public:
Something()
{
}
Something( const Bu::String &sName ) :
uId( Bu::Uuid::generate() ),
sName( sName )
{
}
virtual ~Something()
{
}
virtual const Bu::Uuid getKey() const
{
return uId;
}
private:
Bu::Uuid uId;
Bu::String sName;
};
Bu::ArchiveBase &operator>>( Bu::ArchiveBase &ar, Something &s )
{
return ar >> s.uId >> s.sName;
}
Bu::ArchiveBase &operator<<( Bu::ArchiveBase &ar, const Something &s )
{
return ar << s.uId << s.sName;
}
int main()
{
Bu::File fStore("test.myr", Bu::File::Create|Bu::File::ReadWrite);
MyriadCache<Bu::Uuid, Something> c( fStore );
return 0;
}
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