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#ifndef __MODULELOADER_H
#define __MODULELOADER_H
#include <vector>
#include <map>
#include <string>
#include <stdexcept>
#include <typeinfo>
#include <sstream>
#include <cstdlib>
#ifndef _WIN32
#include <dlfcn.h>
#else
#define WIN32_MEAN_AND_LEAN
#include <windows.h>
#include "win32/errormsg.hpp"
#endif
#include "ModuleRegistry.hpp"
#include "TypeList.hpp"
#include "TypeInfo.hpp"
#ifndef _WIN32
typedef void * ModuleHandle;
#else
typedef HMODULE ModuleHandle;
#endif
template< typename Interface, typename CtorParams = NullType >
struct Module {
ModuleHandle handle;
void *user_data;
ModuleRegistry< Interface, CtorParams > *registry;
Module( ) : handle( 0 ), user_data( 0 ), registry( 0 ) {}
Module( const Module &m ) : handle( m.handle ), user_data( m.user_data ),
registry( m.registry ) {}
Module &operator=( Module m ) {
handle = m.handle;
user_data = m.user_data;
registry = m.registry;
}
};
static size_t nofDeferredModules = 0;
static size_t sizeofDeferredModules = 0;
static ModuleHandle* deferredModules = 0;
const int CLOSE_ON_DTOR = 0;
const int CLOSE_DEFERRED = 1;
const int DEFAULT_FLAGS = CLOSE_ON_DTOR;
static void deferredClose( void )
{
for( size_t i = 0; i < nofDeferredModules; i++ ) {
if( deferredModules[i] ) {
#ifndef _WIN32
dlclose( deferredModules[i] );
#else
(void)FreeLibrary( deferredModules[i] );
#endif
deferredModules[i] = 0;
}
}
free( deferredModules );
}
template< typename Interface, typename CtorParams = NullType >
class BaseModuleLoader {
public:
typedef typename std::map<std::string, Module< Interface, CtorParams > > mapType;
protected:
mapType m_modules;
int m_flags;
public:
BaseModuleLoader( const std::vector<std::string> files, int flags = DEFAULT_FLAGS, void *user_data = 0 )
: m_flags( flags )
{
for( std::vector<std::string>::const_iterator it = files.begin( ); it != files.end( ); it++ ) {
Module< Interface, CtorParams> m;
#ifndef _WIN32
m.handle = dlopen( it->c_str( ), RTLD_NOW | RTLD_LOCAL );
#else
m.handle = LoadLibrary( it->c_str( ) );
#endif
if( !m.handle ) {
std::ostringstream ss;
#ifndef _WIN32
ss << "Module '" << *it << "' loading error: " << dlerror( );
#else
ss << "Module '" << *it << "' loading error: " << getLastError( );
#endif
throw std::runtime_error( ss.str( ) );
}
std::string registryName = "registry_" + demangle( typeid( Interface ) );
#ifndef _WIN32
m.registry = static_cast< ModuleRegistry< Interface, CtorParams > *>( dlsym( m.handle, registryName.c_str( ) ) );
#else
m.registry = ( ModuleRegistry< Interface, CtorParams > *)( GetProcAddress( m.handle, registryName.c_str( ) ) );
#endif
if( !m.registry ) {
#ifndef _WIN32
dlclose( m.handle );
#else
(void)FreeLibrary( m.handle );
#endif
throw std::runtime_error( "missing module registry" );
}
if( m.registry->initModule != 0 ) {
m.registry->initModule( user_data );
}
m.user_data = user_data;
m_modules.insert( std::make_pair( std::string( m.registry->name ), m ) );
}
}
virtual ~BaseModuleLoader< Interface, CtorParams >( )
{
// KLUDGE: we (ab)use the list of modules to remember the destructors
// of derived classes to be called, This should be changed..
// So we inspect only the being of the module list here.
typename mapType::iterator it = m_modules.begin( );
if( it == m_modules.end( ) ) return;
if( (*it).second.registry ) {
if( (*it).second.registry->destroyModule != 0 ) {
(*it).second.registry->destroyModule( (*it).second.user_data );
}
}
if( (*it).second.handle ) {
if( m_flags & CLOSE_DEFERRED ) {
if( nofDeferredModules == 0 ) {
atexit( &deferredClose );
}
if( nofDeferredModules + 1 >= sizeofDeferredModules ) {
sizeofDeferredModules = ( sizeofDeferredModules + 1 ) * 2;
deferredModules = (ModuleHandle *)realloc( deferredModules, sizeofDeferredModules * sizeof( ModuleHandle * ) );
deferredModules[nofDeferredModules++] = (*it).second.handle;
}
} else {
#ifndef _WIN32
dlclose( (*it).second.handle );
#else
(void)FreeLibrary( (*it).second.handle );
#endif
}
}
}
void destroy( Interface *obj )
{
std::string clazz = demangle( typeid( *obj ) );
typename mapType::const_iterator it = m_modules.find( clazz );
if( it == m_modules.end( ) ) {
throw std::runtime_error( "calling unknown destructor" );
}
(*it).second.registry->destroy( obj );
}
};
// TODO: later: variadic template, too soon to be supported everywhere..
template< typename Interface, typename CtorParams = NullType >
class ModuleLoader;
// no param
template< typename Interface >
class ModuleLoader< Interface, NullType > : public BaseModuleLoader< Interface, NullType >
{
public:
ModuleLoader< Interface >( const std::vector<std::string> files, int flags = DEFAULT_FLAGS, void *user_data = 0 )
: BaseModuleLoader< Interface >( files, flags, user_data ) { }
Interface *create( std::string subclass )
{
typename BaseModuleLoader< Interface >::mapType::const_iterator it = BaseModuleLoader< Interface >::m_modules.find( subclass );
if( it == BaseModuleLoader< Interface >::m_modules.end( ) ) {
std::ostringstream ss;
ss << "calling unknown constructor for class '" << subclass << "'";
throw std::runtime_error( ss.str( ) );
}
Interface *obj = (*it).second.registry->create( );
std::string clazz = demangle( typeid( *obj ) );
BaseModuleLoader< Interface >::m_modules.insert( std::make_pair( clazz, (*it).second ) );
return obj;
}
};
// one param
template< typename Interface, typename T1 >
class ModuleLoader< Interface, TYPELIST_1( T1 ) > : public BaseModuleLoader< Interface, TYPELIST_1( T1 ) >
{
public:
ModuleLoader< Interface, TYPELIST_1( T1 ) >( const std::vector<std::string> files, int flags = DEFAULT_FLAGS, void *user_data = 0 )
: BaseModuleLoader< Interface, TYPELIST_1( T1 ) >( files, flags, user_data ) { }
Interface *create( std::string subclass, T1 t1 )
{
typename BaseModuleLoader< Interface, TYPELIST_1( T1 ) >::mapType::const_iterator it = BaseModuleLoader< Interface, TYPELIST_1( T1 ) >::m_modules.find( subclass );
if( it == BaseModuleLoader< Interface, TYPELIST_1( T1 ) >::m_modules.end( ) ) {
std::ostringstream ss;
ss << "calling unknown constructor for class '" << subclass << "'";
throw std::runtime_error( ss.str( ) );
}
Interface *obj = (*it).second.registry->create( t1 );
std::string clazz = demangle( typeid( *obj ) );
(void)BaseModuleLoader< Interface, TYPELIST_1( T1 ) >::m_modules.insert( std::make_pair( clazz, (*it).second ) );
return obj;
}
};
// two params
template< typename Interface, typename T1, typename T2 >
class ModuleLoader< Interface, TYPELIST_2( T1, T2 ) > : public BaseModuleLoader< Interface, TYPELIST_2( T1, T2 ) >
{
public:
ModuleLoader< Interface, TYPELIST_2( T1, T2 ) >( const std::vector<std::string> files, int flags = DEFAULT_FLAGS, void *user_data = 0 )
: BaseModuleLoader< Interface, TYPELIST_2( T1, T2 ) >( files, flags, user_data ) { }
Interface *create( std::string subclass, T1 t1, T2 t2 )
{
typename BaseModuleLoader< Interface, TYPELIST_2( T1, T2 ) >::mapType::const_iterator it = BaseModuleLoader< Interface, TYPELIST_2( T1, T2 ) >::m_modules.find( subclass );
if( it == BaseModuleLoader< Interface, TYPELIST_2( T1, T2 ) >::m_modules.end( ) ) {
std::ostringstream ss;
ss << "calling unknown constructor for class '" << subclass << "'";
throw std::runtime_error( ss.str( ) );
}
Interface *obj = (*it).second.registry->create( t1, t2 );
std::string clazz = demangle( typeid( *obj ) );
(void)BaseModuleLoader< Interface, TYPELIST_2( T1, T2 ) >::m_modules.insert( std::make_pair( clazz, (*it).second ) );
return obj;
}
};
// three params
template< typename Interface, typename T1, typename T2, typename T3 >
class ModuleLoader< Interface, TYPELIST_3( T1, T2, T3 ) > : public BaseModuleLoader< Interface, TYPELIST_3( T1, T2, T3 ) >
{
public:
ModuleLoader< Interface, TYPELIST_3( T1, T2, T3 ) >( const std::vector<std::string> files, int flags = DEFAULT_FLAGS, void *user_data = 0 )
: BaseModuleLoader< Interface, TYPELIST_3( T1, T2, T3 ) >( files, flags, user_data ) { }
Interface *create( std::string subclass, T1 t1, T2 t2, T3 t3 )
{
typename BaseModuleLoader< Interface, TYPELIST_3( T1, T2, T3 ) >::mapType::const_iterator it = BaseModuleLoader< Interface, TYPELIST_3( T1, T2, T3 ) >::m_modules.find( subclass );
if( it == BaseModuleLoader< Interface, TYPELIST_3( T1, T2, T3 ) >::m_modules.end( ) ) {
std::ostringstream ss;
ss << "calling unknown constructor for class '" << subclass << "'";
throw std::runtime_error( ss.str( ) );
}
Interface *obj = (*it).second.registry->create( t1, t2, t3 );
std::string clazz = demangle( typeid( *obj ) );
(void)BaseModuleLoader< Interface, TYPELIST_3( T1, T2, T3 ) >::m_modules.insert( std::make_pair( clazz, (*it).second ) );
return obj;
}
};
// four params
template< typename Interface, typename T1, typename T2, typename T3, typename T4 >
class ModuleLoader< Interface, TYPELIST_4( T1, T2, T3, T4 ) > : public BaseModuleLoader< Interface, TYPELIST_4( T1, T2, T3, T4 ) >
{
public:
ModuleLoader< Interface, TYPELIST_4( T1, T2, T3, T4 ) >( const std::vector<std::string> files, int flags = DEFAULT_FLAGS, void *user_data = 0 )
: BaseModuleLoader< Interface, TYPELIST_4( T1, T2, T3, T4 ) >( files, flags, user_data ) { }
Interface *create( std::string subclass, T1 t1, T2 t2, T3 t3, T4 t4 )
{
typename BaseModuleLoader< Interface, TYPELIST_4( T1, T2, T3, T4 ) >::mapType::const_iterator it = BaseModuleLoader< Interface, TYPELIST_4( T1, T2, T3, T4 ) >::m_modules.find( subclass );
if( it == BaseModuleLoader< Interface, TYPELIST_4( T1, T2, T3, T4 ) >::m_modules.end( ) ) {
std::ostringstream ss;
ss << "calling unknown constructor for class '" << subclass << "'";
throw std::runtime_error( ss.str( ) );
}
Interface *obj = (*it).second.registry->create( t1, t2, t3, t4 );
std::string clazz = demangle( typeid( *obj ) );
(void)BaseModuleLoader< Interface, TYPELIST_4( T1, T2, T3, T4 ) >::m_modules.insert( std::make_pair( clazz, (*it).second ) );
return obj;
}
};
#endif
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