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// --- BEGIN COPYRIGHT BLOCK ---
// 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; version 2 of the License.
//
// 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.cms.servlet.base;
import com.netscape.cms.servlet.common.*;
import java.util.*;
import java.io.*;
import java.security.cert.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.netscape.certsrv.apps.*;
import com.netscape.certsrv.authentication.*;
import com.netscape.certsrv.base.*;
import com.netscape.certsrv.profile.*;
import com.netscape.certsrv.property.*;
import com.netscape.certsrv.template.*;
import com.netscape.certsrv.request.*;
/**
* Displays detailed information about java VM internals, including
* current JVM memory usage, and detailed information about each
* thread.
* <p>
* Also allows user to trigger a new garbage collection
*
* @version $Revision$, $Date$
*/
public class SystemInfoServlet extends HttpServlet {
public SystemInfoServlet() {
}
public void init(ServletConfig sc) throws ServletException {
super.init(sc);
}
/**
* service the request, returning HTML to the client.
* This method has different behaviour depending on the
* value of the 'op' HTTP parameter.
* <UL>
* <LI>op = <i>undefined</i> - display a menu with links to the other functionality of this servlet
* <li>op = gc - tell the JVM that we want to do a garbage collection and to run finalizers
* (@see java.lang.Runtime.getRuntime#gc() )
* <li>op = general - display information about memory, and other JVM informatino
* <li>op = thread - display details about each thread.
* </UL>
* @see javax.servlet.http.HttpServlet#service(HttpServletRequest, HttpServletResponse)
*/
public void service(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
boolean collect = false;
String op = request.getParameter("op");
response.setContentType("text/html");
if (op == null) {
mainMenu(request, response);
} else if (op.equals("gc")) {
gc(request, response);
} else if (op.equals("general")) {
general(request, response);
} else if (op.equals("thread")) {
thread(request, response);
}
}
private void mainMenu(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.getWriter().println("<HTML>");
response.getWriter().println("<H1>");
response.getWriter().println("<a href=" + request.getServletPath() + ">");
response.getWriter().println("Main");
response.getWriter().println("</a>");
response.getWriter().println("</H1>");
response.getWriter().println("<p>");
response.getWriter().println("<table>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("<li>");
response.getWriter().println("<a href=" + request.getServletPath() + "?op=general>");
response.getWriter().println("General");
response.getWriter().println("</a>");
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("<li>");
response.getWriter().println("<a href=" + request.getServletPath() + "?op=gc>");
response.getWriter().println("Garbage Collection");
response.getWriter().println("</a>");
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("<li>");
response.getWriter().println("<a href=" + request.getServletPath() + "?op=thread>");
response.getWriter().println("Thread Listing");
response.getWriter().println("</a>");
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("</table>");
response.getWriter().println("</HTML>");
}
private void gc(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
java.lang.Runtime.getRuntime().gc();
java.lang.Runtime.getRuntime().runFinalization();
response.getWriter().println("<HTML>");
response.getWriter().println("<H1>");
response.getWriter().println("<a href=" + request.getServletPath() + ">");
response.getWriter().println("Main");
response.getWriter().println("</a>");
response.getWriter().println(" : ");
response.getWriter().println("Garbage Collection");
response.getWriter().println("</H1>");
response.getWriter().println("<p>");
response.getWriter().println("The garbage collector has been executed.");
response.getWriter().println("</HTML>");
}
private void general(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.getWriter().println("<HTML>");
response.getWriter().println("<H1>");
response.getWriter().println("<a href=" + request.getServletPath() + ">");
response.getWriter().println("Main");
response.getWriter().println("</a>");
response.getWriter().println(" : ");
response.getWriter().println("General");
response.getWriter().println("</H1>");
response.getWriter().println("<p>");
response.getWriter().println("<table>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("Server Started Time:");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println(new Date(CMS.getStartupTime()));
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("Current Time:");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println(new Date());
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("Available Processors:");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println(Runtime.getRuntime().availableProcessors());
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("Active Threads:");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println(Thread.activeCount());
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("Max Memory (in Bytes):");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println(Runtime.getRuntime().maxMemory());
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("Total Memory (in Bytes):");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println(Runtime.getRuntime().totalMemory());
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("Free Memory (in Bytes):");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println(Runtime.getRuntime().freeMemory());
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("Free Memory / Total Memory:");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println((Runtime.getRuntime().freeMemory() * 100) / Runtime.getRuntime().totalMemory() + "%");
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
response.getWriter().println("</table>");
response.getWriter().println("</HTML>");
}
private void thread(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.getWriter().println("</table>");
response.getWriter().println("<HTML>");
response.getWriter().println("<H1>");
response.getWriter().println("<a href=" + request.getServletPath() + ">");
response.getWriter().println("Main");
response.getWriter().println("</a>");
response.getWriter().println(" : ");
response.getWriter().println("Thread Listing");
response.getWriter().println("</H1>");
response.getWriter().println("<p>");
response.getWriter().println("<table width=100% border=1>");
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println("<b>");
response.getWriter().println("#");
response.getWriter().println("</b>");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println("<b>");
response.getWriter().println("Name");
response.getWriter().println("</b>");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println("<b>");
response.getWriter().println("Priority");
response.getWriter().println("</b>");
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println("<b>");
response.getWriter().println("isDaemon");
response.getWriter().println("</b>");
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
int active = Thread.activeCount();
Thread threads[] = new Thread[active];
int c = Thread.enumerate(threads);
for (int i = 0; i < c; i++) {
response.getWriter().println("<tr>");
response.getWriter().println("<td>");
response.getWriter().println(i);
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println(threads[i].getName());
response.getWriter().println("</td>");
response.getWriter().println("<td>");
response.getWriter().println(threads[i].getPriority());
response.getWriter().println("</td>");
response.getWriter().println("<td>");
if (threads[i].isDaemon()) {
response.getWriter().println("true");
} else {
response.getWriter().println("false");
}
response.getWriter().println("</td>");
response.getWriter().println("</tr>");
}
response.getWriter().println("</table>");
response.getWriter().println("</HTML>");
}
}
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