How to implement Repositoryselector to get different logs in the same webapplication

[sivamma <sk...@yahoo.co.in>]

Hi I would like to get different logs in the same application , based on the
classes.
Our application will be used as a library in another applications.We would
like to have our logs separately from applications using our library.

The applications using our library also have log4j support and at present we
r getting even their logs also into our log file.In thier application,
WEB-INF  contains both the log4j config files.
We r initiating the log4j config through source code.

I have already posted a query regarding the problem what we are facing now.
As i understood ,the problem will get resolve through repository selectors.I
openned another session 
Heri told me the code what i am using for repositoryselectors is useless.Can
you please help me how can i implement respository selectors to solve this
problem.I have very less time.If i could not solve this means i need to move
to our own logging methods,like writing to the files  and send mail using
Java Mail.
But I would like to use Log4j as i am sure there will be some possibility to
solve this kind of problem.

Please find repository selector what i have implemented already and not
useful to solve this problem.

============================================================== 
 package com.CK; 
 import java.io.InputStream; 
 import java.util.HashMap; 
 import java.util.Map; 
 import javax.servlet.ServletConfig; 
 import javax.servlet.ServletException; 
 import javax.xml.parsers.DocumentBuilderFactory; 
 import org.apache.log4j.Hierarchy; 
 import org.apache.log4j.Level; 
 import org.apache.log4j.LogManager; 
 import org.apache.log4j.spi.LoggerRepository; 
 import org.apache.log4j.spi.RepositorySelector; 
 import org.apache.log4j.spi.RootCategory; 
 import java.io.File; 
 import org.apache.log4j.Logger; 
 import org.apache.log4j.Level; 
 import org.apache.log4j.PropertyConfigurator; 
 /** 
  * This RepositorySelector is for use with web applications.   
  * It assumes that your log4j.xml file is in the WEB-INF directory. 
  * @author  Stan Silvert 
  */ 
 public class Log4jSetup implements RepositorySelector 
 { 
    private static boolean initialized = false; 
    // This object is used for the guard because it doesn't get 
    // recycled when the application is redeployed. 
    private static Object guard = LogManager.getRootLogger(); 
     
    private static Map repositories = new HashMap(); 
    private static LoggerRepository defaultRepository; 
    /** 
     * Register your web-app with this repository selector. 
     */ 
  public static String rPath = null; 
  public Log4jSetup(String realPath) 
  { 
   rPath = realPath; 
   //ServletConfig config; 
   init(); 
  } 
    public static synchronized void init() 
    { 
    //String realPath = 
 getServletConfig().getServletContext().getRealPath("/"); 
    //rPath = realPath; 
       if( !initialized ) // set the global RepositorySelector 
       { 
          defaultRepository = LogManager.getLoggerRepository(); 
          RepositorySelector theSelector = new Log4jSetup(); 
          LogManager.setRepositorySelector(theSelector, guard); 
          initialized = true; 
       } 
       
       Hierarchy hierarchy = new Hierarchy(new 
                                 RootCategory(Level.DEBUG)); 
       loadLog4JConfig(hierarchy); 
       ClassLoader loader = 
            Thread.currentThread().getContextClassLoader(); 
       repositories.put(loader, hierarchy); 
    } 
    // load config.properties from WEB-INF 
    private static void loadLog4JConfig(Hierarchy hierarchy) 
    { 
     try 
     { 
    String filePath = 
 rPath+File.separator+"WEB-INF"+File.separator+"config.properties"; 
    String logfilePath = 
 rPath+File.separator+"WEB-INF"+File.separator+"logs"+File.separator; 
    if( !(new File(filePath)).isFile()) 
    { 
     System.err.println("ERROR:Log4jSetUp::Cannot read the Log4J 
 configuration file. " + 
     "Please check the path of the config init param in web.xml"); 
    } 
    System.setProperty("ck.base",logfilePath); 
    PropertyConfigurator.configure(filePath); 
     } 
     catch (Exception e) 
     { 
             System.err.println("Throws Exception::"+e.getMessage()); 
        } 
     } 
    private Log4jSetup() { 
    } 
    public LoggerRepository getLoggerRepository() { 
       ClassLoader loader = 
              Thread.currentThread().getContextClassLoader(); 
       LoggerRepository repository = 
             (LoggerRepository)repositories.get(loader); 
       
       if (repository == null) { 
           return defaultRepository; 
       } else { 
           return repository; 
       } 
    } 
 } 
 ========================================================= 
My Log4j config file

============================================================
log4j.rootCategory=debug, R,mail 

log4j.appender.R=org.apache.log4j.RollingFileAppender 
log4j.appender.R.File=${ck.base}ck_logs.log 
log4j.appender.R.MaxBackupIndex=10 
log4j.appender.R.MaxFileSize=100KB 
log4j.appender.R.layout=org.apache.log4j.PatternLayout 
log4j.appender.R.layout.ConversionPattern=%d{yyyy MMM dd HH\:mm\:ss} -- %p
-- %m%n 

log4j.appender.mail=org.apache.log4j.net.SMTPAppender 
log4j.appender.mail.SMTPPassword=xxxxxx 
log4j.appender.mail.BufferSize=512 
log4j.appender.mail.From=skempili@abc.com 
log4j.appender.mail.SMTPUsername=siva 
log4j.appender.mail.To=skempili@abc.com 
log4j.appender.mail.Subject=\=[SMTPAppender] Application message 
log4j.appender.mail.SMTPHost=mail.abc.com 
log4j.appender.mail.Threshold=WARN 
log4j.appender.mail.evaluatorClass=com.CK.Evaluator 
log4j.appender.mail.layout=org.apache.log4j.PatternLayout 
log4j.appender.mail.layout.ConversionPattern=%d{yyyy MMM dd HH\:mm\:ss} --
%p -- %m%n 
=============================================================================

Thanks & Regards,
Sivamma.


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