FactoryPreloadModule.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/

 
 
//
// includes
//
 
#include <EventLoop/FactoryPreloadModule.h>
 
#include <AsgTools/MessageCheckAsgTools.h>
#include <TInterpreter.h>
#include <TSystem.h>
#include <ranges>
 
//
// method implementations
//
 
namespace EL
{
  namespace Detail
  {
    StatusCode FactoryPreloadModule::onInitialize (ModuleData& /*data*/)
    {
      std::vector<std::string> preloaderList;
      for (auto&& part : std::views::split(preloader.value(), ',')) preloaderList.emplace_back(part.begin(), part.end());
 
      if (preloaderList.size() % 2 != 0)
      {
        ANA_MSG_ERROR ("Invalid preloader list");
        return StatusCode::FAILURE;
      }
 
      for (std::size_t iter = 0; iter < preloaderList.size(); iter += 2)
      {
        const std::string& libName = preloaderList[iter];
        const std::string& funcName = preloaderList[iter + 1];
 
        // TSystem::Load returns 1 when the library is already loaded (e.g.
        // pulled in via dictionary auto-loading), which is not an error;
        // only a negative return value indicates an actual failure.
        if (gSystem->Load(libName.c_str()) < 0)
        {
          ANA_MSG_ERROR ("Failed to load library " << libName);
          return StatusCode::FAILURE;
        }
        if (gInterpreter->Calc((funcName + "()").c_str()) != 1)
        {
          ANA_MSG_ERROR ("Failed to call function " << funcName << " from library " << libName);
          return StatusCode::FAILURE;
        }
      }
 
      return StatusCode::SUCCESS;
    }
  }
}