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LibFactory.cpp

/********************** LibFactory.cpp *******************/

/*
 * Implementation of LibFactory.h
 */

#include "LibFactory.h"

using namespace libfactory;
using namespace std;

bool LibFactory::Register(string const & LibID, string const & Library,
                          string const & Constructor, string const & Destructor){

   IdPairToLib pairAux(LibID, libtriple::make_triple(Library,Constructor,Destructor));
   
   return libassociations_.insert(pairAux).second;
}

bool LibFactory::Unregister(string const & LibID){
  return libassociations_.erase(LibID) == 1;
}

vector<string> LibFactory::List() const {
   vector<string> result;

   for (IdToLib::const_iterator it = libassociations_.begin();
         it != libassociations_.end(); ++it){
      result.push_back(it->first);
   }

   return result;
}

void* LibFactory::LibCreate(string const & LibID, LcgInfo::create_Querier** Creator,
                            LcgInfo::destroy_Querier** Destructor){
   void *Lib_handle;
        IdToLib::iterator it=libassociations_.find(LibID);
        if (it == libassociations_.end()) {
           cerr << "Library with given ID: " << LibID << "not found."<<endl;
           return NULL;
        }
        Lib_handle = dlopen (it->second.first.c_str(), RTLD_NOW|RTLD_GLOBAL);
        if (Lib_handle == NULL) {
           cerr << "Cannot load dynamically loadable library" << it->second.first << endl;
           cerr << "dlerror returns: " << dlerror() << endl;
           return NULL;
        }
        LcgInfo::create_Querier* create_dm = 
                (LcgInfo::create_Querier*) dlsym(Lib_handle,it->second.second.c_str());
        LcgInfo::destroy_Querier* destroy_dm = 
                (LcgInfo::destroy_Querier*) dlsym(Lib_handle,it->second.third.c_str());

   if (!create_dm || !destroy_dm) {
            cerr << "Cannot load library constructor/distructor symbols" << endl;
            cerr << "dlerror returns: " << dlerror() << endl;
            return NULL;
   }

   *Creator =  create_dm;
   *Destructor = destroy_dm;

   return Lib_handle;
}//end of LibCreate

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