1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. 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 import java.lang.management.GarbageCollectorMXBean;
  25 import java.lang.management.ManagementFactory;
  26 
  27 /*
  28  * @test TestEnabled
  29  * @key gc
  30  *
  31  * @run main/othervm -Dexpected=false -Xmx64m                                                       TestEnabled
  32  * @run main/othervm -Dexpected=true  -Xmx64m -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC TestEnabled
  33  */
  34 
  35 public class TestEnabled {
  36 
  37     public static void main(String... args) {
  38         boolean expected = Boolean.getBoolean("expected");
  39         boolean actual = isEnabled();
  40         if (expected != actual) {
  41             throw new IllegalStateException("Error: expected = " + expected + ", actual = " + actual);
  42         }
  43     }
  44 
  45     public static boolean isEnabled() {
  46         for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
  47             if (bean.getName().contains("Shenandoah")) {
  48                 return true;
  49             }
  50         }
  51         return false;
  52     }
  53 
  54 }