/*
 * SystemBackendProc.h
 *
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MAD_MODULES_SYSTEMBACKENDPROC_H_
#define MAD_MODULES_SYSTEMBACKENDPROC_H_

#include <Common/SystemBackend.h>

#include <fstream>

namespace Mad {
namespace Modules {

class SystemBackendProc : private Common::SystemBackend {
  private:
    static SystemBackendProc *backend;

    std::ifstream uptimeFile;
    std::ifstream meminfoFile;
    std::ifstream loadFile;

    SystemBackendProc() : uptimeFile("/proc/uptime"), meminfoFile("/proc/meminfo"), loadFile("/proc/loadavg") {}

  protected:
    virtual bool getUptimeInfo(const boost::function2<void, unsigned long, unsigned long> &callback);
    virtual bool getMemoryInfo(const boost::function4<void, unsigned long, unsigned long, unsigned long, unsigned long> &callback);
    virtual bool getLoadInfo(const boost::function5<void, unsigned long, unsigned long, float, float, float> &callback);

  public:
    static void registerBackend() {
      if(backend)
        return;

      backend = new SystemBackendProc();
      Common::SystemManager::get()->registerBackend(backend);
    }

    static void unregisterBackend() {
      if(!backend)
        return;

      Common::SystemManager::get()->unregisterBackend(backend);
      delete backend;
      backend = 0;
    }
};

}
}

#endif /* MAD_MODULES_SYSTEMBACKENDPROC_H_ */