Tomcat example source code file (StatusTransformer.java)

This example Tomcat source code file (StatusTransformer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Tomcat tags/keywords

exception, integer, integer, io, iterator, long, long, management, max, mbeanserver, object, objectname, objectname, request, response, servlet, set, string, string, util

The Tomcat StatusTransformer.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.apache.catalina.manager;

import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.Method;
import java.text.MessageFormat;
import java.util.Date;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Set;
import java.util.Vector;

import javax.management.MBeanServer;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;

import org.apache.catalina.util.RequestUtil;

/**
 * This is a refactoring of the servlet to externalize
 * the output into a simple class. Although we could
 * use XSLT, that is unnecessarily complex.
 *
 * @author Peter Lin
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 */

public class StatusTransformer {


    // --------------------------------------------------------- Public Methods


    public static void setContentType(HttpServletResponse response, 
                                      int mode) {
        if (mode == 0){
            response.setContentType("text/html;charset="+Constants.CHARSET);
        } else if (mode == 1){
            response.setContentType("text/xml;charset="+Constants.CHARSET);
        }
    }


    /**
     * Process a GET request for the specified resource.
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are creating
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet-specified error occurs
     */
    public static void writeHeader(PrintWriter writer, int mode) {
        if (mode == 0){
            // HTML Header Section
            writer.print(Constants.HTML_HEADER_SECTION);
        } else if (mode == 1){
            writer.write(Constants.XML_DECLARATION);
            writer.write
                (Constants.XML_STYLE);
            writer.write("<status>");
        }
    }


    /**
     * Write the header body. XML output doesn't bother
     * to output this stuff, since it's just title.
     * 
     * @param writer The output writer
     * @param args What to write
     * @param mode 0 means write 
     */
    public static void writeBody(PrintWriter writer, Object[] args, int mode) {
        if (mode == 0){
            writer.print(MessageFormat.format
                         (Constants.BODY_HEADER_SECTION, args));
        }
    }


    /**
     * Write the manager webapp information.
     * 
     * @param writer The output writer
     * @param args What to write
     * @param mode 0 means write
     */
    public static void writeManager(PrintWriter writer, Object[] args, 
                                    int mode) {
        if (mode == 0){
            writer.print(MessageFormat.format(Constants.MANAGER_SECTION, args));
        }
    }


    public static void writePageHeading(PrintWriter writer, Object[] args, 
                                        int mode) {
        if (mode == 0){
            writer.print(MessageFormat.format
                         (Constants.SERVER_HEADER_SECTION, args));
        }
    }


    public static void writeServerInfo(PrintWriter writer, Object[] args, 
                                       int mode){
        if (mode == 0){
            writer.print(MessageFormat.format(Constants.SERVER_ROW_SECTION, args));
        }
    }


    /**
     * 
     */
    public static void writeFooter(PrintWriter writer, int mode) {
        if (mode == 0){
            // HTML Tail Section
            writer.print(Constants.HTML_TAIL_SECTION);
        } else if (mode == 1){
            writer.write("</status>");
        }
    }


    /**
     * Write the OS state. Mode 0 will generate HTML.
     * Mode 1 will generate XML.
     */
    public static void writeOSState(PrintWriter writer, int mode) {
        long[] result = new long[16];
        boolean ok = false;
        try {
            String methodName = "info";
            Class paramTypes[] = new Class[1];
            paramTypes[0] = result.getClass();
            Object paramValues[] = new Object[1];
            paramValues[0] = result;
            Method method = Class.forName("org.apache.tomcat.jni.OS")
                .getMethod(methodName, paramTypes);
            method.invoke(null, paramValues);
            ok = true;
        } catch (Throwable t) {
            // Ignore
        }
        
        if (ok) {
            if (mode == 0){
                writer.print("<h1>OS");

                writer.print("<p>");
                writer.print(" Physical memory: ");
                writer.print(formatSize(new Long(result[0]), true));
                writer.print(" Available memory: ");
                writer.print(formatSize(new Long(result[1]), true));
                writer.print(" Total page file: ");
                writer.print(formatSize(new Long(result[2]), true));
                writer.print(" Free page file: ");
                writer.print(formatSize(new Long(result[3]), true));
                writer.print(" Memory load: ");
                writer.print(new Long(result[6]));
                writer.print("<br>");
                writer.print(" Process kernel time: ");
                writer.print(formatTime(new Long(result[11] / 1000), true));
                writer.print(" Process user time: ");
                writer.print(formatTime(new Long(result[12] / 1000), true));
                writer.print("</p>");
            } else if (mode == 1){
            }
        }
        
    }
    
    
    /**
     * Write the VM state. Mode 0 will generate HTML.
     * Mode 1 will generate XML.
     */
    public static void writeVMState(PrintWriter writer, int mode)
        throws Exception {

        if (mode == 0){
            writer.print("<h1>JVM");

            writer.print("<p>");
            writer.print(" Free memory: ");
            writer.print(formatSize
                         (new Long(Runtime.getRuntime().freeMemory()), true));
            writer.print(" Total memory: ");
            writer.print(formatSize
                         (new Long(Runtime.getRuntime().totalMemory()), true));
            writer.print(" Max memory: ");
            writer.print(formatSize
                         (new Long(Runtime.getRuntime().maxMemory()), true));
            writer.print("</p>");
        } else if (mode == 1){
            writer.write("<jvm>");

            writer.write("<memory");
            writer.write(" free='" + Runtime.getRuntime().freeMemory() + "'");
            writer.write(" total='" + Runtime.getRuntime().totalMemory() + "'");
            writer.write(" max='" + Runtime.getRuntime().maxMemory() + "'/>");

            writer.write("</jvm>");
        }

    }


    /**
     * Write connector state.
     */
    public static void writeConnectorState(PrintWriter writer, 
                                           ObjectName tpName, String name,
                                           MBeanServer mBeanServer,
                                           Vector globalRequestProcessors,
                                           Vector requestProcessors,
                                           int mode)
        throws Exception {

        if (mode == 0) {
            writer.print("<h1>");
            writer.print(name);
            writer.print("</h1>");

            writer.print("<p>");
            writer.print(" Max threads: ");
            writer.print(mBeanServer.getAttribute(tpName, "maxThreads"));
            writer.print(" Current thread count: ");
            writer.print(mBeanServer.getAttribute(tpName, "currentThreadCount"));
            writer.print(" Current thread busy: ");
            writer.print(mBeanServer.getAttribute(tpName, "currentThreadsBusy"));
            try {
                Object value = mBeanServer.getAttribute(tpName, "keepAliveCount");
                writer.print(" Keeped alive sockets count: ");
                writer.print(value);
            } catch (Exception e) {
                // Ignore
            }
            
            writer.print("<br>");

            ObjectName grpName = null;

            Enumeration enumeration = globalRequestProcessors.elements();
            while (enumeration.hasMoreElements()) {
                ObjectName objectName = (ObjectName) enumeration.nextElement();
                if (name.equals(objectName.getKeyProperty("name"))) {
                    grpName = objectName;
                }
            }

            if (grpName == null) {
                return;
            }

            writer.print(" Max processing time: ");
            writer.print(formatTime(mBeanServer.getAttribute
                                    (grpName, "maxTime"), false));
            writer.print(" Processing time: ");
            writer.print(formatTime(mBeanServer.getAttribute
                                    (grpName, "processingTime"), true));
            writer.print(" Request count: ");
            writer.print(mBeanServer.getAttribute(grpName, "requestCount"));
            writer.print(" Error count: ");
            writer.print(mBeanServer.getAttribute(grpName, "errorCount"));
            writer.print(" Bytes received: ");
            writer.print(formatSize(mBeanServer.getAttribute
                                    (grpName, "bytesReceived"), true));
            writer.print(" Bytes sent: ");
            writer.print(formatSize(mBeanServer.getAttribute
                                    (grpName, "bytesSent"), true));
            writer.print("</p>");

            writer.print("<table border=\"0\">