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/*
Copyright (C) 2000 Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include "extensionloader.h"
#include "startupmanager.h"
#include "mcoputils.h"
#include "debug.h"
#include <unistd.h>
#include <assert.h>
using namespace std;
using namespace Arts;
ExtensionLoader::ExtensionLoader(const string& filename) :handle(0)
{
string dlfilename;
assert(filename.size());
if(filename[0] == '/')
dlfilename = filename;
else
{
const vector<string> *path = MCOPUtils::extensionPath();
vector<string>::const_iterator pi;
for(pi = path->begin(); pi != path->end(); pi++)
{
dlfilename = *pi + "/" + filename;
if(access(dlfilename.c_str(),F_OK) == 0)
break;
}
}
/* this will catch all startup classes here */
StartupManager::setExtensionLoader(this);
lt_dlinit();
handle = lt_dlopen(dlfilename.c_str());
StartupManager::setExtensionLoader(0);
if(handle)
{
/* now process all startup classes of the loaded extension */
list<StartupClass *>::iterator i;
for(i = startupClasses.begin(); i != startupClasses.end(); i++)
(*i)->startup();
needShutdown = true;
}
else
{
arts_warning("loading extension from '%s' failed: %s",
dlfilename.c_str(), lt_dlerror());
}
}
bool ExtensionLoader::success()
{
return (handle != 0);
}
void ExtensionLoader::shutdown()
{
if(handle && needShutdown)
{
/* shutdown the loaded extension properly */
list<StartupClass *>::iterator i;
for(i = startupClasses.begin(); i != startupClasses.end(); i++)
(*i)->shutdown();
needShutdown = false;
}
}
ExtensionLoader::~ExtensionLoader()
{
if(handle)
{
shutdown();
lt_dlclose(handle);
/*
* lt_dlexit & lt_dlinit have a counter, so there is no harm in
* calling one lt_dlinit in the constructor and one lt_dlexit here
*/
lt_dlexit();
}
}
void ExtensionLoader::addStartupClass(class StartupClass *sc)
{
startupClasses.push_back(sc);
}
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