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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_FILES_H
#define BU_CACHE_STORE_FILES_H
#include "bu/fstring.h"
#include "bu/file.h"
#include "bu/cachestore.h"
#include "bu/archive.h"
#include "bu/membuf.h"
#include "bu/formatter.h"
#include "bu/sio.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
namespace Bu
{
template<class keytype, class obtype>
keytype __cacheGetKey( const obtype *pObj );
template<class keytype, class obtype>
obtype *__cacheStoreFilesAlloc( const keytype &key )
{
return new obtype();
}
template<class keytype, class obtype>
void __cacheStoreFilesStore( Bu::Stream &s, obtype &rObj,
const keytype & )
{
Bu::Archive ar( s, Bu::Archive::save );
ar << rObj;
}
template<class keytype, class obtype>
obtype *__cacheStoreFilesLoad( Bu::Stream &s, const keytype &key )
{
obtype *pObj = __cacheStoreFilesAlloc<keytype, obtype>( key );
Bu::Archive ar( s, Bu::Archive::load );
ar >> (*pObj);
return pObj;
}
template<class keytype, class obtype>
class CacheStoreFiles : public CacheStore<keytype, obtype>
{
public:
CacheStoreFiles( const Bu::FString &sPrefix ) :
sPrefix( sPrefix )
{
if( access( sPrefix.getStr(), W_OK|R_OK|X_OK ) )
{
mkdir( sPrefix.getStr(), 0755 );
}
}
virtual ~CacheStoreFiles()
{
}
virtual obtype *load( const keytype &key )
{
try
{
Bu::MemBuf mb;
Bu::Formatter f( mb );
f << sPrefix << "/" << key;
Bu::File fIn( mb.getString(), Bu::File::Read );
obtype *pOb = __cacheStoreFilesLoad<keytype, obtype>( fIn, key );
return pOb;
}
catch(...)
{
throw Bu::HashException("File-key not found.");
}
}
virtual void unload( obtype *pObj, const keytype &key )
{
delete pObj;
}
virtual keytype create( obtype *pSrc )
{
keytype key = __cacheGetKey<keytype, obtype>( pSrc );
Bu::MemBuf mb;
Bu::Formatter f( mb );
f << sPrefix << "/" << key;
Bu::File fTouch( mb.getString(), Bu::File::WriteNew );
return key;
}
virtual void sync()
{
}
virtual void sync( obtype *pSrc, const keytype &key )
{
Bu::MemBuf mb;
Bu::Formatter f( mb );
f << sPrefix << "/" << key;
Bu::File fOut( mb.getString(), Bu::File::WriteNew );
__cacheStoreFilesStore<keytype, obtype>( fOut, *pSrc, key );
}
virtual void destroy( obtype *pObj, const keytype &key )
{
Bu::MemBuf mb;
Bu::Formatter f( mb );
f << sPrefix << "/" << key;
unlink( mb.getString().getStr() );
delete pObj;
}
virtual void destroy( const keytype &key )
{
Bu::MemBuf mb;
Bu::Formatter f( mb );
f << sPrefix << "/" << key;
unlink( mb.getString().getStr() );
}
virtual bool has( const keytype &key )
{
Bu::MemBuf mb;
Bu::Formatter f( mb );
f << sPrefix << "/" << key;
return access( mb.getString().getStr(), F_OK ) == 0;
}
virtual Bu::List<keytype> getKeys()
{
DIR *dir = opendir( sPrefix.getStr() );
struct dirent *de;
Bu::List<keytype> lKeys;
while( (de = readdir( dir ) ) )
{
if( de->d_type != DT_REG )
continue;
keytype tmp;
Bu::MemBuf mb( de->d_name );
Bu::Formatter f( mb );
try
{
f >> tmp;
}
catch( Bu::ExceptionBase &e )
{
Bu::sio << "Parse error in dir-scan: " << e.what()
<< Bu::sio.nl;
}
lKeys.append( tmp );
}
closedir( dir );
return lKeys;
}
virtual int getSize()
{
DIR *dir = opendir( sPrefix.getStr() );
struct dirent *de;
int iCount = 0;
while( (de = readdir( dir ) ) )
{
if( de->d_type != DT_REG )
continue;
iCount++;
}
closedir( dir );
return iCount;
}
private:
Bu::FString sPrefix;
};
};
#endif
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