logger.hpp

/*
  ANCH Framework: ANother C++ Hack is a C++ framework based on C++11 standard
  Copyright (C) 2012 Vincent Lachenal

  This file is part of ANCH Framework.

  ANCH Framework is free software: you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  ANCH Framework 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 Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with ANCH Framework.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _ANCH_LOGGER_LOGGER_H_
#define _ANCH_LOGGER_LOGGER_H_

#include <iostream>
#include <sstream>
#include <vector>

#include "logger/levels.hpp"
#include "logger/writer.hpp"

namespace anch {
  namespace logger {

    class Logger {
    private:
      std::string _name;

      anch::logger::Level _level;

      std::vector<anch::logger::Writer*> _writers;

    public:
      Logger(const std::string& name,
             const anch::logger::Level level,
             const std::vector<anch::logger::Writer*>& writers);

      virtual ~Logger();

    public:
      template<typename T, typename... Q>
      void trace(const T& value, const Q&... values) const noexcept {
        log(Level::TRACE, value, values...);
      }

      template<typename T, typename... Q>
      void debug(const T& value, const Q&... values) const noexcept {
        log(Level::DEBUG, value, values...);
      }

      template<typename T, typename... Q>
      void info(const T& value, const Q&... values) const noexcept {
        log(Level::INFO, value, values...);
      }

      template<typename T, typename... Q>
      void warn(const T& value, const Q&... values) const noexcept {
        log(Level::WARN, value, values...);
      }

      template<typename T, typename... Q>
      void error(const T& value, const Q&... values) const noexcept {
        log(Level::ERROR, value, values...);
      }

      template<typename T, typename... Q>
      void fatal(const T& value, const Q&... values) const noexcept {
        log(Level::FATAL, value, values...);
      }

    private:
      template<typename T>
      void log(const Level& level,
               std::ostringstream& out,
               const T& value) const noexcept {
        out << value;
        const std::string& message = out.str();
        for(size_t i = 0 ; i < _writers.size() ; i++) {
          _writers[i]->write(_name, level, message);
        }
      }

      template<typename T, typename... Q>
      void log(const Level& level,
               const T& value,
               const Q&... values) const noexcept {
        if(level >= _level && !_writers.empty()) {
          std::ostringstream out;
          log(level, out, value, values...);
        }
      }

      template<typename T, typename... Q>
      void log(const Level& level,
               std::ostringstream& out,
               const T& value,
               const Q&... values) const noexcept {
        out << value;
        log(level, out, values...);
      }

    };

  }
}

#endif // _ANCH_LOGGER_LOGGER_H_