Logger.cpp

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D 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 2 of the License, or
//    (at your option) any later version.
//
//    Scorched3D 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 Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#include <common/Defines.h>
#include <common/Logger.h>
#include <common/LoggerI.h>
#include <SDL/SDL.h>
#include <SDL/SDL_thread.h>
#include <time.h>
#include <stdio.h>
#include <stdarg.h>
#include <algorithm>

// ************************************************
// NOTE: This logger is and needs to be thread safe
// ************************************************

static SDL_mutex *logMutex_ = 0;
static Uint32 threadId = (Uint32) -1;
Logger * Logger::instance_ = 0;

Logger * Logger::instance()
{
        if (!instance_)
        {
                instance_ = new Logger;
        }
        return instance_;
}

Logger::Logger()
{
        if (!logMutex_) logMutex_ = SDL_CreateMutex();
}

Logger::~Logger()
{
}

void Logger::addLogger(LoggerI *logger)
{
        Logger::instance();
        SDL_LockMutex(logMutex_);
        Logger::instance()->loggers_.push_back(logger);
        SDL_UnlockMutex(logMutex_);
}

void Logger::remLogger(LoggerI *logger)
{
        Logger::instance();
        std::list<LoggerI *>::iterator itor;
        SDL_LockMutex(logMutex_);
        itor = Logger::instance()->loggers_.begin();
        while(itor != Logger::instance()->loggers_.end()) {
                if (*itor == logger) {
                        Logger::instance()->loggers_.erase(itor);
                        break;
                }
                itor++;
        }
        SDL_UnlockMutex(logMutex_);
}

void Logger::log(const std::string &text)
{
        log(text.c_str());
}

void Logger::log(const char *text)
{
        if (!text) return;

        Logger::instance();

        SDL_LockMutex(logMutex_);
        
        LoggerInfo info;
        info.setMessage(text);
        addLog(info);

        SDL_UnlockMutex(logMutex_);

        if (SDL_ThreadID() == threadId)
        {
                processLogEntries();
        }
}

void Logger::log(const LoggerInfo &info)
{
        Logger::instance();

        SDL_LockMutex(logMutex_);
        addLog((LoggerInfo &) info);
        SDL_UnlockMutex(logMutex_);
}

void Logger::addLog(LoggerInfo &info)
{
        // Add the time to the beginning of the log message
        info.setTime();

        // Add single or multiple lines
        char *found = (char *) strchr(info.getMessage(), '\n');
        char *start = (char *) info.getMessage();
        if (found)
        {
                while (found)
                {
                        *found = '\0';
                        LoggerInfo *newInfo = new LoggerInfo(info);
                        newInfo->setMessage(start);
                        instance_->entries_.push_back(newInfo);
                        start = found;
                        start++;

                        found = strchr(start, '\n');

                        /*if (SDL_ThreadID() == threadId)
                        {
                                processLogEntries();
                        }*/
                }
                if (start[0] != '\0')
                {
                        LoggerInfo *newInfo = new LoggerInfo(info);
                        newInfo->setMessage(start);
                        instance_->entries_.push_back(newInfo);
                }
        }
        else
        {
                instance_->entries_.push_back(
                        new LoggerInfo(info));
        }
}

void Logger::processLogEntries()
{
        if (threadId == (Uint32) -1)
        {
                threadId = SDL_ThreadID();
        }

        Logger::instance();

        SDL_LockMutex(logMutex_);
        std::list<LoggerInfo *> &entries = Logger::instance()->entries_;
        while (!entries.empty())
        {
                LoggerInfo *firstEntry = entries.front();

                std::list<LoggerI *> &loggers = Logger::instance()->loggers_;
                std::list<LoggerI *>::iterator logItor;
                for (logItor = loggers.begin();
                        logItor != loggers.end();
                        logItor++)
                {
                        LoggerI *log = (*logItor);
                        log->logMessage(*firstEntry);
                }

                entries.pop_front();
                delete firstEntry;
        }
        SDL_UnlockMutex(logMutex_);
}

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