Re: Create a new log file at every start of the programm

[log4cxx]

I know it's not exactly what you are looking for, but perhaps you can adapt a 
method that we use in our projects. We have many instances running of the same 
program, and for historical purposes, always named log files with the Process 
ID in them to keep them separate. To do this in log4cxx, before initializing, I 
add an environment variable:

#ifdef _MSC_VER
        long processId = _getpid();
        char logpid[20];
        sprintf_s(logpid, "LOGPID=%ld", processId);
        _putenv(logpid);
#else
        long processId = getpid();
        char logpid[20];
        sprintf(logpid, "LOGPID=%ld", processId);
        putenv(logpid);
#endif //_MSC_VER

Then in my configuration file I do:
  <appender name="RFA" class="org.apache.log4j.rolling.RollingFileAppender">
    <rollingPolicy class="org.apache.log4j.rolling.FixedWindowRollingPolicy">
      <param name="activeFileName" value="MyApp_${LOGPID}.log"/>
      <param name="fileNamePattern" value="MyApp_${LOGPID}.log.%i"/>
      <param name="minIndex" value="0"/>
      <param name="maxIndex" value="5"/>
    </rollingPolicy>
    <triggeringPolicy 
class="org.apache.log4j.rolling.SizeBasedTriggeringPolicy">
      <param name="MaxFileSize" value="30MB"/>
    </triggeringPolicy>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%d{MM/dd HH:mm:ss.SSS} %c - %m%n"/>
    </layout>
    <param name="file" value="MyApp_${LOGPID}.log"/>
    <param name="append" value="false"/>
  </appender>

I'm not sure who handles it (log4cxx or the system), but somehow the variable 
gets properly substituted.

Hope this helps.

-Andy


You wrote:

    Hi Anand,

    thanks for your reply. But I think it should be a normal function for a
    logging library to create logfiles for each start of an application. The
    renaming was only an example. Of course it would also be okay using the
    rollOver Function of log4cxx.

    But logging seems either size or time related.

    Hm, if there's no alternative I've got to do it my own.

    Best regards,
    Alex


Hi Alex,

Did you find solution to your problem? Can you please share it?

Regards,
Anand.