jsimlogger.java

一个用于排队系统仿真的开源软件,有非常形象的图象仿真过程!

/**    
  * Copyright (C) 2006, Laboratorio di Valutazione delle Prestazioni - Politecnico di Milano

  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.

  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.

  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
  
package jmt.engine.log;


import org.apache.log4j.PropertyConfigurator;

import java.io.*;
import java.net.URL;
import java.util.Properties;



public class JSimLogger implements Serializable {


    public static final String STD_LOGGER = "jmt.engine";
    public static final String LOG4J_CONF = "log4j.conf";

    private transient org.apache.log4j.Logger logger;

    private static final boolean DEBUG = true;

    static {
        URL props;
        String logProperties = null;

        props = JSimLogger.class.getResource(LOG4J_CONF);
        logProperties = props.toString();

        try {

            if (logProperties!=null){
                File logPropertiesFile = new File(logProperties);
                if (!logPropertiesFile.exists()){
                    logProperties=null;
                }
                else {
                    PropertyConfigurator.configure(logPropertiesFile.toURL());
                    if (DEBUG) {
                        System.out.println("JSimLogger initialized from " + logPropertiesFile.toURL());
                    }
                }
            }
        } catch (IOException ioex) {
            ioex.printStackTrace();
        }


        if (logProperties==null){
            System.out.println("Cannot find logProperties, using defaults");
            //set stdout defaults
            Properties p = new Properties();
            p.setProperty("log4j.rootLogger","DEBUG, stdout");
            //p.setProperty("log4j.rootLogger","ALL, stdout");
            p.setProperty("log4j.appender.stdout","org.apache.log4j.ConsoleAppender");
            p.setProperty("log4j.appender.stdout.layout","org.apache.log4j.PatternLayout");
            p.setProperty("log4j.appender.stdout.layout.ConversionPattern","%-5p [%t]- %m (%F:%L)%n");
            PropertyConfigurator.configure(p);
        }


    }


    private JSimLogger() {
        logger = org.apache.log4j.Logger.getRootLogger();
    }

    private JSimLogger(String loggerName) {
        logger = org.apache.log4j.Logger.getLogger(loggerName);
    }

    public static JSimLogger getRootLogger() {
        JSimLogger mylogger = new JSimLogger();
        return mylogger;
    }

    public static JSimLogger getLogger() {
        return getLogger(JSimLogger.STD_LOGGER);
    }

    public static JSimLogger getLogger(Object caller) {
        JSimLogger mylogger = null;
        if (caller != null) {
            mylogger = JSimLogger.getLogger(caller.getClass());
        } else {
            mylogger = JSimLogger.getLogger();
        }
        return mylogger;
    }

    public static JSimLogger getLogger(Class callerClass) {
        JSimLogger mylogger = new JSimLogger(callerClass.getName());
        return mylogger;
    }

    public static JSimLogger getLogger(String loggerName) {
        JSimLogger mylogger = new JSimLogger(loggerName);
        return mylogger;
    }

    // printing methods:
    public void debug(Object message) {
        logger.debug(message);
    }

    public void info(Object message) {
        logger.info(message);
    }

    public void warn(Object message) {
        logger.warn(message);
    }

    public void error(Object message) {
        logger.error(message);
    }

    public void error(Throwable th) {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        th.printStackTrace(pw);
        String buffer = sw.toString();
        logger.error(buffer);
    }

    public void fatal(Object message) {
        logger.fatal(message);
    }


    public boolean isDebugEnabled() {
        return logger.isDebugEnabled();

    }

 }