Enter another file with log4cxx

Question

I want to enter different files in my code.

How can I do this in Log4cxx with xml configuration or programmatically in code ...

• Suppose I have components 1.k, k + 1, .. n.
• They run in one application.
• I want the k log component to write Logger-k, k + 1 to Logger-k + 1 at the same time

Update:

Logger.addAppender () approach:

log4cxx::helpers::Pool p; 

std::string paramAppender = "appxNormalAppender";
std::string paramFileName = "\\Logs\\MyLog.txt";

LOG4CXX_DECODE_CHAR(logAppender, paramAppender );
LOG4CXX_DECODE_CHAR(logFileName, paramFileName );


FileAppenderPtr fileAppender = 
logger->getLoggerRepository()->getRootLogger()->getAppender(logAppender);

if(fileAppender!= NULL)
{


    fileAppender->setFile(logFileName);

    fileAppender->activateOptions(p);

}

This does not work because

Suppose I set the name FileName for Logger-k for the k-component, it is written to the Logger-k log, then I set the file name Logger-k + 1 for the linker k + 1, then both components k and k + 1 register the same loggerk + 1 file. It seems the last file name overrides or affects everyone else ...

AND

All componeent compenent 1, ... compoeent k, componentk + 1, .... component n are in the same application ...

Answer 1

, FileAppender, , Logger.addAppender().

Answer 2

. afile1 afile2. : my.logger1 my.logger2. my.logger1, mylog1. my.logger2, mylog2 .

log.properties:

log4cplus.appender.afile1.layout=log4cplus::PatternLayout
log4cplus.appender.afile1.layout.ConversionPattern=%d [ %c{1} ] [ %-5p ] %m%n
log4cplus.appender.afile1=log4cplus::RollingFileAppender
log4cplus.appender.afile1.File=mylog1.log
log4cplus.appender.afile1.MaxFileSize=5MB
log4cplus.appender.afile1.MaxBackupIndex=2

log4cplus.appender.afile2.layout=log4cplus::PatternLayout
log4cplus.appender.afile2.layout.ConversionPattern=%d [ %c{1} ] [ %-5p ] %m%n
log4cplus.appender.afile2=log4cplus::RollingFileAppender
log4cplus.appender.afile2.File=mylog2.log
log4cplus.appender.afile2.MaxFileSize=5MB
log4cplus.appender.afile2.MaxBackupIndex=2

log4cplus.logger.my.logger1=INHERIT, afile1
log4cplus.additivity.my.logger1=false
log4cplus.logger.my.logger2=INHERIT, afile2
log4cplus.additivity.my.logger2=false 

:
example.cpp:

#include <iostream>
#include <log4cplus/logger.h>
#include <log4cplus/loglevel.h>
#include <log4cplus/configurator.h>
#include <log4cplus/fileappender.h>

#define MYLOG1_INFO(logEvent) LOG4CPLUS_INFO (log4cplus::Logger::getInstance("my.logger1"), logEvent)
#define MYLOG2_INFO(logEvent) LOG4CPLUS_INFO (log4cplus::Logger::getInstance("my.logger2"), logEvent)

int main(int argc, char**argv)
{
    try
    {
        log4cplus::PropertyConfigurator::doConfigure("log.properties");
    }
    catch( ... )
    {
    std::cerr<<"Exception occured while opening log.properties\n";
    return -1;
    }
    MYLOG1_INFO("hello world!");
    MYLOG2_INFO("hello world!");
    return 0;
}

Makefile ( , log4cplus ):

CXXFLAGS+=-I$(abspath ../log4cplus-1.0.4/include)
all: example.o
    $(CXX) $^ $(abspath ../log4cplus-1.0.4/src/.libs/liblog4cplus.a) -lpthread -o test

, , appenders

Log4cplus log4j. log4j. , log4cplus.sourceforge.net

. log4cplus doxygen.
, %
:

...
log4cplus.appender.afile2.layout.ConversionPattern=[%i] %m%n
...

Answer 3

:

#include <boost/foreach.hpp>
#include <boost/thread.hpp>
#include <boost/bind.hpp>
#include <boost/lexical_cast.hpp>

#include <log4cxx/Logger.h>
#include <log4cxx/LogManager.h>
#include <log4cxx/xml/domconfigurator.h>
#include <log4cxx/FileAppender.h>
#include <log4cxx/SimpleLayout.h>
#include <log4cxx/helpers/transcoder.h>


void func(int k) {
    std::string strName = "Log." + boost::lexical_cast<std::string>(k);
    log4cxx::LoggerPtr log = log4cxx::Logger::getLogger(strName);
    LOG4CXX_DECODE_CHAR(fileName, strName + ".log");
    log4cxx::FileAppenderPtr appender(new log4cxx::FileAppender(new log4cxx::SimpleLayout, fileName, false));
    log->addAppender(appender);

    LOG4CXX_INFO(log, strName);

    log->removeAppender(appender);
}

int main(int argc, char * argv[]) {
    log4cxx::xml::DOMConfigurator::configure("trace.xml");
    if(log4cxx::Logger::getLogger("Log")->getAllAppenders().empty()) {
        std::cout << "failed to config log4cxx" << std::endl;
        return 1;
    }
    log4cxx::LoggerPtr log = log4cxx::Logger::getLogger("Log");

    boost::thread_group threadGroup;
    for(int k = 0; k != 3; ++k) {
        threadGroup.create_thread(boost::bind(func, k));
    }
    threadGroup.join_all();
    return 0;
}

trace.xml

<?xml version="1.0" encoding="UTF-8" ?>
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="ConsoleAppender" class="org.apache.log4j.ConsoleAppender"> 
        <param name="Target" value="System.out"/> 
        <layout class="org.apache.log4j.SimpleLayout"/> 
    </appender>

    <root>
        <level value="all"/>
    </root> 

    <category name="Log">
        <level value="INFO"/>
        <appender-ref ref="ConsoleAppender"/>
    </category>
</log4j:configuration>