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#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include "bu/cache.h"
#include "bu/file.h"
#include "bu/fstring.h"
#include "bu/cachecalc.h"
class Bob
{
public:
Bob()
{
TRACE();
}
Bob( int i ) :
iInt( i )
{
TRACE( i );
}
virtual ~Bob()
{
TRACE();
}
void setInt( int i )
{
TRACE( i );
iInt = i;
}
int getInt()
{
return iInt;
}
int iInt;
};
namespace Bu {
template<>
void __tracer_format<Bob*>( Bob* const &c )
{
printf("%08X=%d", (uint32_t)c, c->getInt() );
}
}
class BobStore : public Bu::CacheStore<Bob, long>
{
public:
BobStore() :
cLastId( 0 )
{
TRACE();
if( access( "bobcache/last", R_OK|W_OK ) )
{
mkdir("bobcache", 0755 );
Bu::File f("bobcache/last", Bu::File::Write|Bu::File::Create );
f.write("0", 1);
printf("Initializing cache: %s\n", strerror( errno ) );
}
else
{
cLastId = readNum("bobcache/last");
}
}
~BobStore()
{
TRACE();
writeNum("bobcache/last", cLastId );
}
long readNum( const Bu::FString &sFile )
{
TRACE( sFile );
Bu::File f( sFile, Bu::File::Read );
char buf[80];
buf[f.read( buf, 80 )] = '\0';
return strtol( buf, NULL, 0 );
}
void writeNum( const Bu::FString &sFile, long num )
{
TRACE( sFile, num );
Bu::File f( sFile,
Bu::File::Write|Bu::File::Create|Bu::File::Truncate
);
Bu::FString s;
s.format("%d", num );
f.write( s );
}
virtual Bob *load( const long &key )
{
TRACE( key );
Bu::FString sDest;
sDest.format("bobcache/%d", key );
return new Bob( readNum( sDest ) );
}
virtual void unload( Bob *pObj, const long &key )
{
TRACE( pObj, key );
Bu::FString sDest;
sDest.format("bobcache/%d", key );
writeNum( sDest, pObj->getInt() );
delete pObj;
}
virtual long create( Bob *rSrc )
{
TRACE( rSrc );
long id = ++cLastId;
Bu::FString sDest;
sDest.format("bobcache/%d", id );
writeNum( sDest, rSrc->getInt() );
return id;
}
virtual void destroy( Bob *pObj, const long &key )
{
TRACE( pObj, key );
Bu::FString sDest;
sDest.format("bobcache/%d", key );
if( !access( sDest.getStr(), F_OK ) )
unlink( sDest.getStr() );
delete pObj;
}
private:
long cLastId;
};
class BobCalc : public Bu::CacheCalc<Bob, long>
{
public:
BobCalc()
{
}
virtual ~BobCalc()
{
}
virtual void onLoad( Bob *, const long & )
{
}
virtual void onUnload( Bob *, const long & )
{
}
private:
};
int main( int argc, char *argv[] )
{
TRACE( argc, argv );
typedef Bu::Cache<Bob, long> BobCache;
typedef BobCache::Ptr BobPtr;
if( argc < 3 )
{
printf("Try: %s [crud] [<id/value>]\n\n", argv[0] );
return 0;
}
BobCache cBob( new BobCalc(), new BobStore() );
switch( argv[1][0] )
{
case 'c':
{
BobCache::Ptr pBob = cBob.insert(
new Bob( strtol( argv[2], NULL, 0 ) )
);
printf("Key = %ld\n", pBob.getKey() );
}
return 0;
case 'r':
{
BobCache::Ptr pBob = cBob.get( strtol( argv[2], NULL, 0 ) );
printf("Value = %d\n", pBob->getInt() );
}
return 0;
case 'u':
{
BobCache::Ptr pBob = cBob.get( strtol( argv[2], NULL, 0 ) );
pBob->setInt( strtol( argv[3], NULL, 0 ) );
}
return 0;
case 'd':
{
cBob.erase( strtol( argv[2], NULL, 0 ) );
}
return 0;
}
}
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