1 /*
   2  * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
   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     8061616
  27  * @summary Basic Test for HotSpotDiagnosticMXBean.getVMOption() and double values
  28  * @author  Jaroslav Bachorik
  29  *
  30  * @modules jdk.management
  31  * @run main/othervm -XX:CompileThresholdScaling=0.14 GetDoubleVMOption
  32  */
  33 
  34 import com.sun.management.HotSpotDiagnosticMXBean;
  35 import com.sun.management.VMOption;
  36 import java.lang.management.ManagementFactory;
  37 import java.util.List;
  38 import javax.management.MBeanServer;
  39 
  40 public class GetDoubleVMOption {
  41     private static final String COMPILE_THRESHOLD_SCALING = "CompileThresholdScaling";
  42     private static final String EXPECTED_VALUE = "0.14";
  43     private static final String HOTSPOT_DIAGNOSTIC_MXBEAN_NAME =
  44         "com.sun.management:type=HotSpotDiagnostic";
  45 
  46     public static void main(String[] args) throws Exception {
  47         List<HotSpotDiagnosticMXBean> list =
  48             ManagementFactory.getPlatformMXBeans(HotSpotDiagnosticMXBean.class);
  49         HotSpotDiagnosticMXBean mbean = list.get(0);
  50         checkVMOption(mbean);
  51 
  52         MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
  53         mbean = ManagementFactory.newPlatformMXBeanProxy(mbs,
  54                     HOTSPOT_DIAGNOSTIC_MXBEAN_NAME,
  55                     HotSpotDiagnosticMXBean.class);
  56         checkVMOption(mbean);
  57     }
  58 
  59     private static void checkVMOption(HotSpotDiagnosticMXBean mbean) {
  60         VMOption option = mbean.getVMOption(COMPILE_THRESHOLD_SCALING);
  61         if (!option.getValue().equalsIgnoreCase(EXPECTED_VALUE)) {
  62             throw new RuntimeException("Unexpected value: " +
  63                 option.getValue() + " expected: " + EXPECTED_VALUE);
  64         }
  65     }
  66 }