Log different categories to different logfile

[Niko Schweitzer <Sc...@nue.et-inf.uni-siegen.de>]

Hi,

I would like to log diefferent log categories to different logfiles but I 
dont see
a way how to do this. I have included a short test-class that should 
describe my problem.

I want to use three Log-categories LOG, LOGTime and LOGMem.
The output of each categoty should go to a separate logfile, eg.
deflog.log, timelog.log and memlog.log.

Any idea how to do this?

Kind regards,

Niko Schweitzer



-------------------------------------------------------

import org.apache.log4j.Category;
import org.apache.log4j.PropertyConfigurator;

public class TempTestClass {

  // <log4j> _________________________________________________________//
  private static String         sDirWork       = 
System.getProperty("user.dir");
  private static String         sDirLog4jConf  = "log4jconfig";
  private static String         sDirLogfiles   = "log4jlogfiles";
  private static String         sFS            = File.separator;
  private final static String   sClassName     = 
TempTestClass.class.getName();
  private static String         sLog4jConfFile = sDirWork + sFS + 
sDirLog4jConf + sFS
                                                   + 
"log4jTimingConfig.lcf";
  private static String         sLog4jLogFile  = sDirWork + sFS + 
sDirLogfiles + sFS
                                                   + "defaultLogFile.log";
  private final static Category LOG            = 
Category.getInstance(sClassName);
  private final static Category LOGTime        = 
Category.getInstance(sClassName + ".time");
  private final static Category LOGMem        = 
Category.getInstance(sClassName + ".mem");
  // </log4j> _________________________________________________________//
  /** **********************************************************
   * Method main
   *
   *
   * @param args
   */
  public static void main(String[] args) {
  System.out.println(" hallo");
  LOG.debug(" -> to default logfile");
  LOGTime.debug(" -> to timing logfile");
  LOGMem.debug(" -> to memory logfile");
  }
  /** **********************************************************
   * Method initLog4j
   *
   */
  private static void initLog4j() {

    // 
/--------------------------------------------------------------------------
-//
    // modify categories Priorities to change output level
    // for instance if Priority is set to INFO no debug-logs will be output
    LOG.setPriority(org.apache.log4j.Priority.DEBUG);
    // test if log4j was already initializes
    // Skip default initialization if the system property
    // log4j.defaultInitOverride is set to any value other than "false" or 
"null".
    // equivalent to
    // the DEFAULT_INIT_OVERRIDE_KEY indicates if Log4j has been initialized
    // if this proerty is not set
    if (System.getProperty(Category.DEFAULT_INIT_OVERRIDE_KEY) == null) {
      System.setProperty(Category.DEFAULT_INIT_OVERRIDE_KEY, "false");
    }
    if (System.getProperty(Category.DEFAULT_CONFIGURATION_KEY) == null) {
      System.setProperty(Category.DEFAULT_CONFIGURATION_KEY, 
sLog4jConfFile);
    }
    // 
---------------------------------------------------------------------------
//
    // do initialization if DEFAULT_INIT_OVERRIDE_KEY == "false"
    boolean bLogFileDeleted = false;
    if 
(System.getProperty(Category.DEFAULT_INIT_OVERRIDE_KEY).equalsIgnoreCase("f
alse")) {
      // delete old logfile
      try {
        File file = new File(sLog4jLogFile);
        if (file.exists()) {
          // System.out.println( sLog4jLogFile +"-file.exists() = true");
          bLogFileDeleted = file.delete();
        }
      } catch (Exception ex) {}
      // Configure Log4j
 
PropertyConfigurator.configure(System.getProperty(Category.DEFAULT_CONFIGUR
ATION_KEY));
      // set System.property to initialized
      System.setProperty(Category.DEFAULT_INIT_OVERRIDE_KEY, "true");
      LOG.debug("<METHOD name=initLog4j()> with "
                + System.getProperty(Category.DEFAULT_CONFIGURATION_KEY)
                + ", old logfile deleted = " + bLogFileDeleted + 
"</METHOD>");
    }
    // 
---------------------------------------------------------------------------
//
    else    // already initialized, skip initialization
    {
      LOG.debug("<METHOD name=initLog4j()>  log4j already inititalized 
</METHOD>");
    }
  }

  static{
    initLog4j();

  }


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