Plugins.hpp

Go to the documentation of this file.

#ifndef CAFE_PLUGINS_HPP__
#define CAFE_PLUGINS_HPP__

#include "TPluginManager.h"
#include "TROOT.h"

#include <stdexcept>

namespace cafe {

    class Plugins {
    public:
        static Plugins *instance();

        // Look up and load plugin with 'url', pass it 'arg'
        // as 'const char *' argument.
        template<class T>
        T *load(const std::string& type, const std::string& url, const std::string& arg);
    private:
        Plugins();
        ~Plugins();
        static Plugins *s_instance;
    };


    // Implementation
    template<class T>
    T *Plugins::load(const std::string& type, const std::string& url, const std::string& arg)
    {
        TPluginManager *mgr = gROOT->GetPluginManager();
        if(TPluginHandler *handler = mgr->FindHandler(type.c_str(), url.c_str())) {
            if(handler->LoadPlugin() == 0) {
                return reinterpret_cast<T*>(handler->ExecPlugin(1, arg.c_str()));
            } else {
                throw std::runtime_error("Plugin not found: " + type);
            }
        }
        return 0;
    }
}

#endif // CAFE_PLUGINS_HPP__

---