configurationservlet.java

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    /* CRMS, customer relationship management system
    Copyright (C) 2003  Service To Youth Council

    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    For further information contact the SYC ICT department on [e-mail]
    98 Kermode Street
    North Adelaide
    South Australia
    SA 5006 
    [phone]
    */
/*
 * ============================================================================
 *                   The Apache Software License, Version 1.1
 * ============================================================================
 *
 *    Copyright (C) 1999 The Apache Software Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of  source code must  retain the above copyright  notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include  the following  acknowledgment:  "This product includes  software
 *    developed  by the  Apache Software Foundation  (http://www.apache.org/)."
 *    Alternately, this  acknowledgment may  appear in the software itself,  if
 *    and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "log4j" and  "Apache Software Foundation"  must not be used to
 *    endorse  or promote  products derived  from this  software without  prior
 *    written permission. For written permission, please contact
 *    [e-mail].
 *
 * 5. Products  derived from this software may not  be called "Apache", nor may
 *    "Apache" appear  in their name,  without prior written permission  of the
 *    Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS  FOR A PARTICULAR  PURPOSE ARE  DISCLAIMED.  IN NO  EVENT SHALL  THE
 * APACHE SOFTWARE  FOUNDATION  OR ITS CONTRIBUTORS  BE LIABLE FOR  ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLU-
 * DING, BUT NOT LIMITED TO, PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR  PROFITS; OR BUSINESS  INTERRUPTION)  HOWEVER CAUSED AND ON
 * ANY  THEORY OF LIABILITY,  WHETHER  IN CONTRACT,  STRICT LIABILITY,  OR TORT
 * (INCLUDING  NEGLIGENCE OR  OTHERWISE) ARISING IN  ANY WAY OUT OF THE  USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software  consists of voluntary contributions made  by many individuals
 * on  behalf of the Apache Software  Foundation.  For more  information on the
 * Apache Software Foundation, please see <http://www.apache.org/>.
 *
 */

package crms.servlet;

import org.apache.log4j.Level;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

import java.io.IOException;
import java.io.PrintWriter;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.SingleThreadModel;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * A servlet used to dynamically adjust package logging levels
 * while an application is running.  NOTE: This servlet is
 * only aware of pre-configured packages and packages that contain objects
 * that have logged at least one message since application startup.
 *
 * @author <a href="mailto:[e-mail]">Luther E. Birdzell</a>
 * @since 1.3
 */
public class ConfigurationServlet extends HttpServlet
  implements SingleThreadModel {
  /**
   * The response content type: text/html
   */
  public static final String CONTENT_TYPE = "text/html";

  /**
   * The root appender.
   */
  public static final String ROOT = "Root";

  /**
   * The name of the class / package.
   */
  public static final String CLASS = "CLASS";

  /**
   * The logging level.
   */
  public static final String PRIORITY = "PRIORITY";

  /**
   * Print the status of all current <code>Logger</code>s and
   * an option to change their respective logging levels.
   *
   * @param request a <code>HttpServletRequest</code> value
   * @param response a <code>HttpServletResponse</code> value
   * @exception ServletException if an error occurs
   * @exception IOException if an error occurs
   */
  public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    response.setContentType(CONTENT_TYPE);

    PrintWriter out = response.getWriter();
    List loggers = getSortedLoggers();
    Logger logger = null;
    String loggerName = null;
    int loggerNum = 0;

    // print title and header
    out.println(
      "<html><head><title>Log4J Control Console</title></head>"
      + "<body><H3>Log4J Control Console</H3>");
    out.println("<A href=\"" + request.getRequestURI() + "\">Refresh</A><HR>");
    out.println("<table width=\"50%\" border=\"1\">");
    out.println("<tr BGCOLOR=\"#5991A6\">");
    out.println(
      "<td><FONT  COLOR=\"BLACK\" FACE=\"Helvetica\"><B>Class</B></FONT></td>");
    out.print(
      "<td><FONT  COLOR=\"BLACK\" FACE=\"Helvetica\"><B>Priority</B></FONT>");
    out.println("</td>");
    out.println("</tr>");

    // print the root Logger
    displayLogger(out, Logger.getRootLogger(), loggerNum++, request);

    // print the rest of the loggers
    Iterator ii = loggers.iterator();

    while (ii.hasNext()) {
      displayLogger(out, (Logger) ii.next(), loggerNum++, request);
    }

    out.println("</table>");
    out.println(
      "<FONT SIZE=\"-3\" COLOR=\"BLACK\" FACE=\"Helvetica\">* "
      + "Inherits Priority From Parent.</FONT><BR>");
    out.println("<A href=\"" + request.getRequestURI() + "\">Refresh</A><HR>");

    // print set options
    out.println(
      "<FORM action=\"" + request.getRequestURI() + "\" method=\"post\">");
    out.println(
      "<FONT  SIZE=\"+2\" COLOR=\"BLACK\" FACE=\"Helvetica\"><U>"
      + "Set Log4J Option</U><BR><BR></FONT>");
    out.println("<FONT COLOR=\"BLACK\" FACE=\"Helvetica\">");
    out.println("<table width=\"50%\" border=\"1\">");
    out.println("<tr BGCOLOR=\"#5991A6\">");
    out.println(
      "<td><FONT COLOR=\"BLACK\" "
      + "FACE=\"Helvetica\"><B>Class Name:</B></FONT></td>");
    out.println("<td><SELECT name=\"CLASS\">");
    out.println("<OPTION VALUE=\"" + ROOT + "\">" + ROOT + "</OPTION>");

    ii = loggers.iterator();

    while (ii.hasNext()) {
      logger = (Logger) ii.next();
      loggerName = (logger.getName().equals("") ? "Root" : logger.getName());
      out.println(
        "<OPTION VALUE=\"" + loggerName + "\">" + loggerName + "</OPTION>");
    }

    out.println("</SELECT><BR></td></tr>");

    // print logging levels
    out.println(
      "<tr BGCOLOR=\"#5991A6\"><td><FONT COLOR=\"BLACK\" "
      + "FACE=\"Helvetica\"><B>Priority:</B></FONT></td>");
    out.println("<td><SELECT name=\"PRIORITY\">");
    out.println(
      "<OPTION VALUE=\"" + Level.OFF + "\">" + Level.OFF + "</OPTION>");
    out.println(
      "<OPTION VALUE=\"" + Level.FATAL + "\">" + Level.FATAL + "</OPTION>");
    out.println(
      "<OPTION VALUE=\"" + Level.ERROR + "\">" + Level.ERROR + "</OPTION>");
    out.println(
      "<OPTION VALUE=\"" + Level.WARN + "\">" + Level.WARN + "</OPTION>");
    out.println(
      "<OPTION VALUE=\"" + Level.INFO + "\">" + Level.INFO + "</OPTION>");
    out.println(
      "<OPTION VALUE=\"" + Level.DEBUG + "\">" + Level.DEBUG + "</OPTION>");
    out.println(
      "<OPTION VALUE=\"" + Level.ALL + "\">" + Level.ALL + "</OPTION>");
    out.println("</SELECT><BR></td></tr>");
    out.println("</table></FONT>");
    out.println(
      "<input type=\"submit\" name=\"Submit\" value=\"Set Option\"></FONT>");
    out.println("</FORM>");
    out.println("</body></html>");

    out.flush();
    out.close();
  }

  /**
   * Change a <code>Logger</code>'s level, then call <code>doGet</code>
   * to refresh the page.
   *
   * @param request a <code>HttpServletRequest</code> value
   * @param response a <code>HttpServletResponse</code> value
   * @exception ServletException if an error occurs
   * @exception IOException if an error occurs
   */
  public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    String className = (String) request.getParameter(CLASS);
    String priority = (String) request.getParameter(PRIORITY);

    if (className != null) {
      setClass(className, priority);
    }

    doGet(request, response);
  }

  /**
    Print a Logger and its current level.

    @param out the output writer.
    @param logger the logger to output.
    @param row the row number in the table this logger will appear in.
    @param request the servlet request. */
  private void displayLogger(
    PrintWriter out, Logger logger, int row, HttpServletRequest request) {
    String color = null;
    String loggerName =
      (logger.getName().equals("") ? ROOT : logger.getName());

    color = ((row % 2) == 1) ? "#E1E1E1" : "#FBFBFB";

    out.println("<tr BGCOLOR=\"" + color + "\">");
    out.println(
      "<td><FONT SIZE=\"-2\" COLOR=\"BLACK\" FACE=\"Helvetica\">" + loggerName
      + "</FONT></td>");
    out.println(
      "<td><FONT SIZE=\"-2\" COLOR=\"BLACK\" FACE=\"Helvetica\">"
      + ((logger.getLevel() == null)
      ? (logger.getEffectiveLevel().toString() + "*")
      : logger.getLevel().toString()) + "</FONT></td>");
    out.println("</tr>");
  }

  /**
    Set a logger's level.

    @param className class name of the logger to set.
    @param level the level to set the logger to.
    @return String return message for display. */
  private synchronized String setClass(String className, String level) {
    Logger logger = null;
    String message = null;

    try {
      logger =
        (className.equals(ROOT)) ? logger.getRootLogger()
                                 : logger.getLogger(className);

      logger.setLevel(Level.toLevel(level));
    } catch (Exception e) {
      System.out.println("ERROR Setting LOG4J Logger:" + e);
    }

    return "Message Set For "
    + (logger.getName().equals("") ? ROOT : logger.getName());
  }

  /**
    Get a sorted list of all current loggers.

    @return List the list of sorted loggers. */
  private List getSortedLoggers() {
    Logger logger = null;
    Enumeration enum = LogManager.getCurrentLoggers();
    Comparator comp = new LoggerComparator();
    ArrayList list = new ArrayList();

    // Add all current loggers to the list
    while (enum.hasMoreElements()) {
      list.add(enum.nextElement());
    }

    // sort the loggers
    Collections.sort(list, comp);

    return list;
  }

  /**
   * Compare the names of two <code>Logger</code>s.  Used
   * for sorting.
   */
  private class LoggerComparator implements Comparator {
    /**
     * Compare the names of two <code>Logger</code>s.
     *
     * @param o1 an <code>Object</code> value
     * @param o2 an <code>Object</code> value
     * @return an <code>int</code> value
     */
    public int compare(Object o1, Object o2) {
      Logger logger1 = (Logger) o1;
      Logger logger2 = (Logger) o2;
      ;

      String logger1Name = null;
      String logger2Name = null;

      if (logger1 != null) {
        logger1Name = (logger1.getName().equals("") ? ROOT : logger1.getName());
      }

      if (logger2 != null) {
        logger2Name = (logger2.getName().equals("") ? ROOT : logger2.getName());
      }

      return logger1Name.compareTo(logger2Name);
    }

    /**
     * Return <code>true</code> if the <code>Object</code> is a
     * <code>LoggerComparator</code> instance.
     *
     *
     * @param o an <code>Object</code> value
     * @return a <code>boolean</code> value
     */
    public boolean equals(Object o) {
      return (o instanceof LoggerComparator);
    }
  }
}


//EOF