1 /*
   2  * Copyright (c) 2004, 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
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  23 
  24 /*
  25  * @test
  26  * @bug 5011189 8004928
  27  * @summary Unit test for java.lang.management.CompilationMXBean
  28  *
  29  * @modules java.management
  30  * @run main/othervm -Xcomp -Xbatch Basic
  31  */
  32 import java.lang.management.*;
  33 
  34 public class Basic {
  35 
  36     public static void main(String args[]) {
  37         CompilationMXBean mb = ManagementFactory.getCompilationMXBean();
  38         if (mb == null) {
  39             System.out.println("The virtual machine doesn't have a compilation system");
  40             return;
  41         }
  42 
  43         // Exercise getName() method
  44         System.out.println(mb.getName());
  45 
  46         // If compilation time monitoring isn't supported then we are done
  47         if (!mb.isCompilationTimeMonitoringSupported()) {
  48             System.out.println("Compilation time monitoring not supported.");
  49             return;
  50         }
  51 
  52         // Exercise getTotalCompilationTime();
  53         long time;
  54 
  55         // If the compiler has already done some work then we are done
  56         time = mb.getTotalCompilationTime();
  57         if (time > 0) {
  58             printCompilationTime(time);
  59             return;
  60         }
  61 
  62         // Now the hard bit - we do random work on the assumption
  63         // that the compiler will be used.
  64 
  65         System.out.println("Doing random work...");
  66 
  67         java.util.Locale.getAvailableLocales();
  68         java.security.Security.getProviders();
  69         java.nio.channels.spi.SelectorProvider.provider();
  70 
  71         time = mb.getTotalCompilationTime();
  72         if (time > 0) {
  73             printCompilationTime(time);
  74         } else {
  75             throw new RuntimeException("getTimeCompilionTime returns 0");
  76         }
  77     }
  78 
  79     static void printCompilationTime(long time) {
  80         System.out.println("Total compilation time: " + time + " ms");
  81     }
  82 }