// LogManager.h:
//
#include " ace/log_msg.h "
#include " ace/Object_Manager.h "
#include " aceSingleton.h "

#include < fstream >
using std::ofstream;

#pragma once

#define ACE_NDEBUG0
#define ACE_NTRACE0


class LogManager
... {
public :
LogManager();
~ LogManager();

void redirectToDaemon
( const ACE_TCHAR * prog_name = ACE_TEXT( "" ));
void redirectToSyslog
( const ACE_TCHAR * prog_name = ACE_TEXT( "" ));

void redirectToOStream(ACE_OSTREAM_TYPE * output);
void redirectToFile( const char * filename);
void redirectToStderr( void );
ACE_Log_Msg_Callback * redirectToCallback
(ACE_Log_Msg_Callback * callback);

private :

std::ofstream * log_stream_;
ACE_OSTREAM_TYPE * output_stream_;
} ;

typedefACE_Singleton < LogManager,ACE_Null_Mutex >
LogManagerSingleton;
#define Log_MANAGERLogManagerSingleton::instance();

LogManager::LogManager():log_stream_( 0 ),output_stream_( 0 )
... {

}

LogManager:: ~ LogManager()
... {
if (log_stream_)
log_stream_ -> close();

deletelog_stream_;
}

void LogManager::redirectToSyslog( const ACE_TCHAR * prog_name)
... {
ACE_LOG_MSG -> open(prog_name,ACE_Log_Msg::SYSLOG,prog_name);
}

void LogManager::redirectToDaemon( const ACE_TCHAR * prog_name)
... {
ACE_LOG_MSG -> open(prog_name,ACE_Log_Msg::LOGGER,
ACE_DEFAULT_LOGGER_KEY);
}

void LogManager::redirectToOStream(ACE_OSTREAM_TYPE * output)
... {
output_stream_ = output;
ACE_LOG_MSG -> msg_ostream( this -> output_stream_);
ACE_LOG_MSG -> clr_flags(
ACE_Log_Msg::STDERR | ACE_Log_Msg::LOGGER);
ACE_LOG_MSG -> set_flags(ACE_Log_Msg::OSTREAM);
}

void LogManager::redirectToFile( const char * filename)
... {
log_stream_ = new std::ofstream();
log_stream_ -> open(filename,ios:: out | ios::app);
this -> redirectToOStream(log_stream_);
}

void LogManager::redirectToStderr( void )
... {
ACE_LOG_MSG -> clr_flags(
ACE_Log_Msg::OSTREAM | ACE_Log_Msg::LOGGER);
ACE_LOG_MSG -> set_flags(ACE_Log_Msg::STDERR);
}

ACE_Log_Msg_Callback *
LogManager::redirectToCallback(ACE_Log_Msg_Callback * callback)
... {
ACE_Log_Msg_Callback * previous =
ACE_LOG_MSG -> msg_callback(callback);
if (callback == 0 )
... {
ACE_LOG_MSG -> clr_flags(ACE_Log_Msg::MSG_CALLBACK);
}
else
... {
ACE_LOG_MSG -> set_flags(ACE_Log_Msg::MSG_CALLBACK);
}

return previous;
}

/**/ /*
LogManager類的主要局限是，它假定輸出每次只去往一個地方。對于我們一些小的例子而言足夠，但對于足夠復雜的工程則遠遠不夠，如何克服這個局限其實也不難，下次將做進一步的改進。
*/