[boost] Re: recommend logging library?

From: Daniel Frey (daniel.frey_at_[hidden])
Date: 2004-03-19 06:13:47

John Torjo wrote:
> Daniel Frey wrote:
> 
>> John Torjo wrote:
>>> if (activity_log()) activity_log() << ...;
>>
>> Hm, too verbose for my taste. With the macro, you get it for free.
>>
> True. I can also add a macro, something like:
> 
> log(activity) << ...;

OK, although there is more to keep in mind. In our logging system, we 
also added a try/catch macro around the expression that is to be logged. 
The reason is, that we never want a log-message to abort the program. I 
attached our actual implementation ('attached' to prevent reformatting), 
obviously I can't show the complete system :)

Regards, Daniel

-- 
Daniel Frey
aixigo AG - financial solutions & technology
Schloß-Rahe-Straße 15, 52072 Aachen, Germany
fon: [phone], fax: [phone]
eMail: daniel.frey_at_[hidden], web: http://www.aixigo.de

/// The basic underlying LOG-macro (implementing the guard if requested)
#ifdef AIXIGO_NO_LOG_GUARD
#define AIXIGO_LOG( level, errorLevel, message )                         \
do {                                                                     \
   if( ::Base::Log::hasLoggers( level ) ) {                              \
      ::Base::Log::log( level, __FILE__, __LINE__, message );            \
   }                                                                     \
} while( false )
#else
#define AIXIGO_LOG( level, errorLevel, message )                                        \
do {                                                                                    \
   try {                                                                                \
      if( ::Base::Log::hasLoggers( level ) ) {                                          \
         ::Base::Log::log( level, __FILE__, __LINE__, message );                        \
      }                                                                                 \
   } catch( ... ) {                                                                     \
      ::Base::Log::log( errorLevel, __FILE__, __LINE__,                                 \
                        "Failed to process " #level " log message \"" #message "\"" );  \
   }                                                                                    \
} while( false )
#endif

#define LOG_TRACE( message )    AIXIGO_LOG( ::Base::Log::TRACE, ::Base::Log::ERROR, message )
#define LOG_DEBUG( message )    AIXIGO_LOG( ::Base::Log::DEBUG, ::Base::Log::ERROR, message )
#define LOG_INFO( message )     AIXIGO_LOG( ::Base::Log::INFO, ::Base::Log::ERROR, message )
#define LOG_WARN( message )     AIXIGO_LOG( ::Base::Log::WARN, ::Base::Log::ERROR, message )
#define LOG_ERROR( message )    AIXIGO_LOG( ::Base::Log::ERROR, ::Base::Log::ERROR, message )
#define LOG_FATAL( message )    AIXIGO_LOG( ::Base::Log::FATAL, ::Base::Log::FATAL, message )