ian@0: //  Copyright 2011, Ian Hobson.
ian@0: //
ian@0: //  This file is part of gpsynth.
ian@0: //
ian@0: //  gpsynth is free software: you can redistribute it and/or modify
ian@0: //  it under the terms of the GNU General Public License as published by
ian@0: //  the Free Software Foundation, either version 3 of the License, or
ian@0: //  (at your option) any later version.
ian@0: //
ian@0: //  gpsynth is distributed in the hope that it will be useful,
ian@0: //  but WITHOUT ANY WARRANTY; without even the implied warranty of
ian@0: //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
ian@0: //  GNU General Public License for more details.
ian@0: //
ian@0: //  You should have received a copy of the GNU General Public License
ian@0: //  along with gpsynth in the file COPYING. 
ian@0: //  If not, see http://www.gnu.org/licenses/.
ian@0: 
ian@0: // Simple threadsafe logger class
ian@0: 
ian@0: #pragma once
ian@0: 
ian@0: #include "boost/shared_ptr.hpp"
ian@0: #include "boost/thread.hpp"
ian@0: 
ian@0: #include <iostream>
ian@0: #include <queue>
ian@0: #include <string>
ian@0: 
ian@0: namespace logger {
ian@0: 
ian@0: class Logger {
ian@0:   std::ostream& output_stream_;
ian@0:   std::queue<std::string> log_queue_;
ian@0:   boost::mutex queue_mutex_;
ian@0:   boost::shared_ptr<boost::thread> logging_thread_;
ian@0:   boost::condition_variable queue_condition_;
ian@0:   bool quit_thread_;
ian@0:   
ian@0: public:
ian@0:   Logger();
ian@0:   ~Logger();
ian@0:   void LogMessage(const std::string& message);
ian@0:   void Flush();
ian@0:   
ian@0:   static Logger& Singleton() {
ian@0:     static Logger singleton;
ian@0:     return singleton;
ian@0:   }
ian@0: 
ian@0: private:
ian@0:   void WorkerThread();
ian@0: };
ian@0: 
ian@0: inline void Log(const std::string& message) {
ian@0:   Logger::Singleton().LogMessage(message);
ian@0: }
ian@0: 
ian@0: inline void Flush() {
ian@0:   Logger::Singleton().Flush();
ian@0: }
ian@0: 
ian@0: } // logger namespace