libjava/classpath/examples/gnu/classpath/examples/management/TestClassLoading.java

   1 /* TestClassLoading.java -- Tests the class loading bean.
   2    Copyright (C) 2006 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath examples.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA. */
  20
  21 package gnu.classpath.examples.management;
  22
  23 import java.lang.management.ClassLoadingMXBean;
  24 import java.lang.management.ManagementFactory;
  25
  26 import static java.lang.management.ManagementFactory.CLASS_LOADING_MXBEAN_NAME;
  27
  28 import javax.management.Attribute;
  29 import javax.management.MBeanServer;
  30 import javax.management.ObjectName;
  31
  32 public class TestClassLoading
  33 {
  34   public static void main(String[] args)
  35     throws Exception
  36   {
  37     System.out.println("Testing locally...");
  38     ClassLoadingMXBean bean = ManagementFactory.getClassLoadingMXBean();
  39     System.out.println("Bean: " + bean);
  40     System.out.println("Loaded classes: " + bean.getLoadedClassCount());
  41     System.out.println("Unloaded classes: " + bean.getUnloadedClassCount());
  42     System.out.println("Total loaded classes: " + bean.getTotalLoadedClassCount());
  43     boolean verbosity = bean.isVerbose();
  44     System.out.println("Verbose class output: " + (verbosity ? "yes" : "no"));
  45     System.out.println("Changing verbose setting...");
  46     bean.setVerbose(!verbosity);
  47     System.out.println("Verbose class output: " + (bean.isVerbose() ? "yes" : "no"));
  48     System.out.println("Testing via the server...");
  49     MBeanServer server = ManagementFactory.getPlatformMBeanServer();
  50     ObjectName classBean = new ObjectName(CLASS_LOADING_MXBEAN_NAME);
  51     System.out.println("Bean: " + classBean);
  52     System.out.println("Loaded classes: " + server.getAttribute(classBean, "LoadedClassCount"));
  53     System.out.println("Unloaded classes: " + server.getAttribute(classBean,
  54                                                                   "UnloadedClassCount"));
  55     System.out.println("Total loaded classes: " + server.getAttribute(classBean,
  56                                                                       "TotalLoadedClassCount"));
  57     verbosity = (Boolean) server.getAttribute(classBean, "Verbose");
  58     System.out.println("Verbose class output: " + (verbosity ? "yes" : "no"));
  59     System.out.println("Changing verbose setting...");
  60     server.setAttribute(classBean, new Attribute("Verbose", !verbosity));
  61     System.out.println("Verbose class output: " + ((Boolean)
  62                                                    server.getAttribute(classBean, "Verbose") ?
  63                                                    "yes" : "no"));
  64     System.out.println("Testing via the proxy...");
  65     bean = ManagementFactory.newPlatformMXBeanProxy(server, CLASS_LOADING_MXBEAN_NAME,
  66                                                     ClassLoadingMXBean.class);
  67     System.out.println("Bean: " + bean);
  68     System.out.println("Loaded classes: " + bean.getLoadedClassCount());
  69     System.out.println("Unloaded classes: " + bean.getUnloadedClassCount());
  70     System.out.println("Total loaded classes: " + bean.getTotalLoadedClassCount());
  71     verbosity = bean.isVerbose();
  72     System.out.println("Verbose class output: " + (verbosity ? "yes" : "no"));
  73     System.out.println("Changing verbose setting...");
  74     bean.setVerbose(!verbosity);
  75     System.out.println("Verbose class output: " + (bean.isVerbose() ? "yes" : "no"));
  76   }
  77 }