LoggerFactory.java

package de.tud.kom.socom.web.server.util;

import org.apache.log4j.xml.DOMConfigurator;

/*
 * Provides the "service" to return a correctly named Logger instance for the
 * caller class
 * @author Johannes Konert
 */
public class LoggerFactory
{
	
	private static final String PATH_TO_LOG4J_CONFIGFILE = "../../config/log4j.xml";
	private static boolean initialized = false;

    private LoggerFactory()
    {
        throw new UnsupportedOperationException();
        // intentionally no instances
    }


    // call this at least once per runtime to have the LoggerFactory read and
    // watch the XML-based config file for Log4J
    public static void initializeLoggerFactory(String cfgFilePath)
    {
        DOMConfigurator.configureAndWatch(cfgFilePath);
        initialized = true;
    }


    /**
     * Returns a new or existing Logger for caller class
     * 
     * @return returns a Logger instance of a wrapper to Log4J Logger named exactly as the
     *         caller class-path e.g. de.tud.kom.socom.util.LoggerFactory
     */
    public static Logger getLogger()
    {
    	if(!initialized){
//    		if(!GWT.isProdMode() && !GWT.isClient())
//    			initializeLoggerFactory("../../SocomAPI/config/log4j.xml");
//    		else
    			initializeLoggerFactory(PATH_TO_LOG4J_CONFIGFILE);
    	}
        Throwable t = new Throwable();
        StackTraceElement[] stack = t.getStackTrace();
        String loggerName = (stack.length > 1) ? stack[1].getClassName()
                : stack[0].getClassName();
        return new Logger(org.apache.log4j.Logger.getLogger(loggerName));
    }

}