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/*
* The Mana World Server
* Copyright 2004 The Mana World Development Team
*
* This file is part of The Mana World.
*
* The Mana World 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 any later version.
*
* The Mana World 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 The Mana World; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id$
*/
#ifndef _TMWSERV_LOGGER_H_
#define _TMWSERV_LOGGER_H_
#include <iosfwd>
#include <fstream>
#include <sstream>
#include "singleton.h"
namespace utils
{
/**
* A very simple logger that writes messages to a log file.
* If the log file is not set, the messages are routed to the standard output
* or the standard error depending on the level of the message.
* By default, the messages will be timestamped but the logger can be
* configured to not prefix the messages with a timestamp.
*
* Limitations:
* - not thread-safe.
*
* Notes:
* - this class implements the Meyer's singleton design pattern.
*
* Example of use:
*
* <pre>
* \#include "logger.h"
*
* int main(void)
* {
* using namespace utils;
*
* Logger& logger = Logger::instance();
* logger.setLogFile("/path/to/logfile");
*
* // log messages using helper macros.
* LOG("hello world")
* LOG_DEBUG("level: " << 3)
* LOG_INFO("init sound")
* LOG_WARN("not implemented")
* LOG_ERROR("resource not found")
* LOG_FATAL("unable to init graphics")
*
* // log messages using APIs.
* logger.log("hello world");
*
* std::ostringstream os;
* os << "level: " << 3;
* logger.debug(os.str());
*
* logger.info("init sound");
* logger.warn("not implemented");
* logger.error("resource not found");
* logger.fatal("unable to init graphics");
*
* return 0;
* }
* </pre>
*/
class Logger: public Singleton<Logger>
{
// friend so that Singleton can call the constructor.
friend class Singleton<Logger>;
public:
/**
* Set the log file.
*
* This method will open the log file for writing, the former file
* contents are removed.
*
* @param logFile the log file name (may include path).
*
* @exception std::ios::failure if the log file could not be opened.
*/
void
setLogFile(const std::string& logFile);
/**
* Add/remove the timestamp.
*
* @param flag if true, a log message will always be timestamped
* (default = true).
*/
void
setTimestamp(bool flag = true)
throw();
/**
* Set tee mode.
*
* @param flag if true, write messages to both the standard (or error)
* output and the log file (if set) (default = true).
*/
void
setTeeMode(bool flag = true)
throw();
/**
* Set the verbosity level of the logger.
*
* @param verbosity is the level of verbosity.
* 0 = Standard infos
* 1 = + Infos on loading/unloading/reloading resources
* 2 = + Packets names and messages sent.
*/
void
setVerbosity(unsigned short verbosity = 0) { mVerbosity = verbosity; }
/**
* Set tee mode.
*
* @param flag if true, write messages to both the standard (or error)
* output and the log file (if set) (default = true).
*/
unsigned short
getVerbosity() { return mVerbosity; }
/**
* Log a generic message.
*
* @param msg the message to log.
*
* @param atVerbosity the minimum verbosity level
* to log this
*
* @exception std::ios::failure.
*/
void
log(const std::string &msg, unsigned short atVerbosity = 0);
/**
* Log a debug message.
*
* @param msg the message to log.
*
* @param atVerbosity the minimum verbosity level
* to log this
*
* @exception std::ios::failure.
*/
void
debug(const std::string &msg, unsigned short atVerbosity = 0);
/**
* Log an info message.
*
* @param msg the message to log.
*
* @param atVerbosity the minimum verbosity level
* to log this
*
* @exception std::ios::failure.
*/
void
info(const std::string &msg, unsigned short atVerbosity = 0);
/**
* Log a warn message.
*
* @param msg the message to log.
*
* @param atVerbosity the minimum verbosity level
* to log this
*
* @exception std::ios::failure.
*/
void
warn(const std::string &msg, unsigned short atVerbosity = 0);
/**
* Log an error message.
*
* @param msg the message to log.
*
* @param atVerbosity the minimum verbosity level
* to log this
*
* @exception std::ios::failure.
*/
void
error(const std::string &msg, unsigned short atVerbosity = 0);
/**
* Log a fatal error message.
*
* @param msg the message to log.
*
* @param atVerbosity the minimum verbosity level
* to log this
*
* @exception std::ios::failure.
*/
void
fatal(const std::string &msg, unsigned short atVerbosity = 0);
private:
/**
* Default constructor.
*/
Logger(void)
throw();
/**
* Destructor.
*/
~Logger(void)
throw();
/**
* Copy constructor.
*/
Logger(const Logger& rhs);
/**
* Assignment operator.
*/
Logger&
operator=(const Logger& rhs);
/**
* Log a generic message.
*
* @param os the output stream.
* @param msg the message to log.
* @param prefix the message prefix (default = "").
*
* @exception std::ios::failure.
*/
void
log(std::ostream& os,
const std::string& msg,
const std::string& prefix = "");
/**
* Get the current time.
*
* @return the current time as string.
*/
std::string
getCurrentTime(void);
std::ofstream mLogFile; /**< the log file */
bool mHasTimestamp; /**< the timestamp flag */
bool mTeeMode; /**< the tee mode flag */
unsigned short mVerbosity; /**< keeps the verbosity level */
};
} // namespace utils
// HELPER MACROS
#define LOG(msg, atVerbosity) \
do { \
std::ostringstream os; \
os << msg; \
::utils::Logger::instance().log(os.str(), atVerbosity); \
} while(0)
#define LOG_DEBUG(msg, atVerbosity) \
do { \
std::ostringstream os; \
os << msg; \
::utils::Logger::instance().debug(os.str(), atVerbosity); \
} while (0)
#define LOG_INFO(msg, atVerbosity) \
do { \
std::ostringstream os; \
os << msg; \
::utils::Logger::instance().info(os.str(), atVerbosity); \
} while (0)
#define LOG_WARN(msg, atVerbosity) \
do { \
std::ostringstream os; \
os << msg; \
::utils::Logger::instance().warn(os.str(), atVerbosity); \
} while (0)
#define LOG_ERROR(msg, atVerbosity) \
do { \
std::ostringstream os; \
os << msg; \
::utils::Logger::instance().error(os.str(), atVerbosity); \
} while (0)
#define LOG_FATAL(msg, atVerbosity) \
do { \
std::ostringstream os; \
os << msg; \
::utils::Logger::instance().fatal(os.str(), atVerbosity); \
} while (0)
#endif // _TMWSERV_LOGGER_H_
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