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/*
* Copyright (C) 2007-2023 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_OBJECT_H
#define BU_CACHE_OBJECT_H
#ifndef NULL
#define NULL 0
#endif
namespace Bu
{
template<typename keytype, typename obtype> class CacheBase;
template<typename keytype, typename obtype> class CacheEntry;
template<typename keytype, typename obtype>
class CacheObject
{
friend class CacheBase<keytype, obtype>;
//friend class CacheObject<keytype, obtype>::Initializer;
public:
CacheObject() :
pCache( NULL ),
pEntry( NULL ),
bChanged( false )
{
}
virtual ~CacheObject()
{
}
typedef CacheObject<keytype, obtype> MyType;
typedef CacheBase<keytype, obtype> CacheType;
typedef CacheEntry<keytype, obtype> EntryType;
virtual keytype getKey() const=0;
virtual int getPersistenceScore() const { return 0; }
void lock() const
{
if( pEntry )
pEntry->lock();
}
void unlock() const
{
if( pEntry )
pEntry->unlock();
}
int getRefCount() const
{
if( pEntry )
return pEntry->getRefCount();
return -1;
}
bool hasChanged() const
{
return bChanged;
}
class Locker
{
public:
Locker( const MyType *pObj ) :
pObj( pObj ),
bLocked( true )
{
pObj->lock();
}
~Locker()
{
unlock();
}
void unlock()
{
if( !bLocked )
return;
pObj->unlock();
bLocked = false;
}
void lock()
{
if( bLocked )
return;
pObj->lock();
bLocked = true;
}
private:
const MyType *pObj;
bool bLocked;
};
protected:
void changed( bool bChanged=true )
{
if( this->bChanged == false && bChanged == true && pCache &&
pEntry && !pEntry->isDeleted() )
pCache->objectChanged( getKey() );
this->bChanged = bChanged;
}
void changed( bool bChanged=true ) const // not really!
{
if( bChanged == true )
return;
this->bChanged = bChanged;
}
CacheType *getCache()
{
return pCache;
}
CacheType *getCache() const
{
return pCache;
}
public:
class Initializer
{
friend class CacheBase<keytype,obtype>;
private:
Initializer( CacheBase<keytype,obtype> *pCache ) :
pCache( pCache )
{
}
public:
template<typename subtype>
subtype *operator()( subtype *pNewObj )
{
pNewObj->setCache( pCache );
return pNewObj;
}
private:
CacheBase<keytype,obtype> *pCache;
};
private:
void setCache( CacheType *pCache )
{
this->pCache = pCache;
}
void setCacheEntry( EntryType *pEntry )
{
this->pEntry = pEntry;
}
private:
CacheType *pCache;
EntryType *pEntry;
mutable bool bChanged;
};
}
#endif
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