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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_PLUGGER_H
#define BU_PLUGGER_H
#ifndef WIN32 //yeah, this one is going to take some work...
#include "bu/hash.h"
#include "bu/list.h"
#include <dlfcn.h>
#include "bu/exceptionbase.h"
#include "bu/string.h"
#include <stddef.h>
namespace Bu
{
subExceptionDecl( PluginException );
typedef struct PluginInfo
{
const char *sID;
const char *sAuthor;
unsigned short nVersion;
unsigned short nRevision;
void *(*createPlugin)();
void (*destroyPlugin)( void * );
} PluginInfo;
typedef struct PluginReg
{
bool bBuiltin;
void *dlHandle;
PluginInfo *pInfo;
} PluginReg;
#define PluginInterface( classname, baseclass, name, ver, rev ) \
extern "C" { \
baseclass *create ##classname() \
{ \
return new classname(); \
} \
void destroy ##classname( baseclass *pCls ) \
{ \
delete pCls; \
} \
Bu::PluginInfo classname = { \
#classname, name, ver, rev, \
create ##classname, destroy ##classname }; \
}
#define PluginInterface2( pluginname, classname, baseclass, name, ver, rev ) \
extern "C" { \
baseclass *create ##classname() \
{ \
return new classname(); \
} \
void destroy ##classname( baseclass *pCls ) \
{ \
delete pCls; \
} \
Bu::PluginInfo pluginname = { \
#pluginname, name, ver, rev, \
(void *(*)())(create ##classname), \
(void (*)( void * ))(destroy ##classname) }; \
}
#define PluginInterface3( structname, pluginname, classname, baseclass, name, ver, rev ) \
extern "C" { \
baseclass *create ##classname() \
{ \
return new classname(); \
} \
void destroy ##classname( baseclass *pCls ) \
{ \
delete pCls; \
} \
Bu::PluginInfo structname = { \
#pluginname, name, ver, rev, \
(void *(*)())(create ##classname), \
(void (*)( void * ))(destroy ##classname) }; \
}
template<class T>
class Plugger
{
public:
typedef Bu::Hash<Bu::String, PluginReg *> PluginHash;
typedef Bu::Hash<ptrdiff_t, void *> InstHash;
public:
Plugger()
{
}
virtual ~Plugger()
{
for( InstHash::iterator i = hObj.begin(); i != hObj.end(); i++ )
{
T *pPlug = (T *)i.getKey();
PluginReg *pReg = (PluginReg *)*i;
pReg->pInfo->destroyPlugin( pPlug );
}
for( PluginHash::iterator i = hPlugin.begin();
i != hPlugin.end(); i++ )
{
if( (*i)->bBuiltin == false )
{
dlclose( (*i)->dlHandle );
}
delete (*i);
}
}
void registerBuiltinPlugin( PluginInfo *pInfo )
{
PluginReg *pReg = new PluginReg;
pReg->bBuiltin = true;
pReg->pInfo = pInfo;
hPlugin.insert( pInfo->sID, pReg );
}
void registerExternalPlugin( const Bu::String &sFName,
const Bu::String &sPluginName )
{
PluginReg *pReg;
try {
pReg = (PluginReg *)hPlugin[sPluginName];
hPlugin.erase( sPluginName );
dlclose( pReg->dlHandle );
delete pReg;
pReg = NULL;
} catch( Bu::HashException &e )
{
}
pReg = new PluginReg;
pReg->bBuiltin = false;
pReg->dlHandle = dlopen( sFName.getStr(), RTLD_NOW );
if( pReg->dlHandle == NULL )
{
throw PluginException( 1, "Error on %s: %s", sFName.getStr(),
dlerror() );
}
pReg->pInfo = (PluginInfo *)dlsym( pReg->dlHandle,
sPluginName.getStr() );
if( pReg->pInfo == NULL )
{
throw PluginException( 2, "Error on %s: %s", sFName.getStr(),
dlerror() );
}
hPlugin.insert( pReg->pInfo->sID, pReg );
}
T *instantiate( const Bu::String &lpName )
{
PluginReg *pReg = (PluginReg *)hPlugin[lpName];
if( pReg == NULL )
return NULL;
T *p = (T *)pReg->pInfo->createPlugin();
hObj.insert( (ptrdiff_t)p, pReg );
//printf("pReg: %08X, pPlug: %08X\n", pReg, p );
return p;
}
bool hasPlugin( const Bu::String &lpName )
{
return hPlugin.has( lpName );
}
void destroy( T *pPlug )
{
PluginReg *pReg = (PluginReg *)hObj.get((int)pPlug);
//printf("pReg: %08X, pPlug: %08X\n", pReg, pPlug );
if( pReg == NULL )
return;
pReg->pInfo->destroyPlugin( pPlug );
hObj.erase( (ptrdiff_t)pPlug );
}
void unloadAll()
{
for( PluginHash::iterator i = hPlugin.begin();
i != hPlugin.end(); i++ )
{
if( (*i)->bBuiltin == false )
{
dlclose( (*i)->dlHandle );
}
delete (*i);
}
hPlugin.clear();
}
Bu::List<Bu::String> getPluginList()
{
return hPlugin.getKeys();
}
private:
PluginHash hPlugin;
InstHash hObj;
};
}
#endif //#ifndef WIN32 //yeah, this one is going to take some work...
#endif
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