1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug     4858522
  27  * @summary Basic unit test of HotspotClassLoadingMBean.getInitializedClassCount()
  28  * @author  Steve Bohne
  29  * @modules java.management/sun.management
  30  * @run main/othervm -XX:+UsePerfData GetInitializedClassCount
  31  */
  32 
  33 /*
  34  * This test is just a sanity check and does not check for the correct value.
  35  */
  36 
  37 import sun.management.*;
  38 
  39 public class GetInitializedClassCount {
  40 
  41     private static HotspotClassLoadingMBean mbean =
  42         (HotspotClassLoadingMBean)ManagementFactoryHelper.getHotspotClassLoadingMBean();
  43 
  44     // Careful with these values.
  45     private static final long MIN_VALUE_FOR_PASS = 1;
  46     private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE;
  47 
  48     private static boolean trace = false;
  49 
  50     public static void main(String args[]) throws Exception {
  51         if (args.length > 0 && args[0].equals("trace")) {
  52             trace = true;
  53         }
  54 
  55         long value = mbean.getInitializedClassCount();
  56 
  57         if (trace) {
  58             System.out.println("Initialized class count: " + value);
  59         }
  60 
  61         if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) {
  62             throw new RuntimeException("Initialized class count " +
  63                                        "illegal value: " + value + " " +
  64                                        "(MIN = " + MIN_VALUE_FOR_PASS + "; " +
  65                                        "MAX = " + MAX_VALUE_FOR_PASS + ")");
  66         }
  67 
  68         // Initialize a class
  69         Class.forName("ClassToInitialize0");
  70 
  71         long value2 = mbean.getInitializedClassCount();
  72 
  73         if (trace) {
  74             System.out.println("Initialized class count2: " + value2);
  75         }
  76 
  77         // If new count does not reflect that at least one class has
  78         // been initialized, throw an exception.  We don't check that
  79         // _exactly_ one class has been initialized because another
  80         // thread may (rarely) have also done some class initialization.
  81         if (value2 < value + 1) {
  82             throw new RuntimeException("Initialized class count " +
  83                                        "did not increase " +
  84                                        "(value = " + value + "; " +
  85                                        "value2 = " + value2 + ")");
  86         }
  87 
  88         System.out.println("Test passed.");
  89     }
  90 }
  91 
  92 class ClassToInitialize0 {
  93     static int i = 0;
  94     static {
  95         i = 1;
  96     }
  97 }