1 /*
   2  * Copyright (c) 2017, 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 TestConcurrentPhaseControlBasics
  26  * @bug 8169517
  27  * @summary Basic tests of WhiteBox concurrent GC phase control.
  28  * @key gc
  29  * @modules java.base
  30  * @library /test/lib
  31  * @build sun.hotspot.WhiteBox
  32  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  33  * @run main/othervm
  34  *   -Xbootclasspath/a:.
  35  *   -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
  36  *   TestConcurrentPhaseControlBasics
  37  */
  38 
  39 import sun.hotspot.WhiteBox;
  40 
  41 public class TestConcurrentPhaseControlBasics {
  42 
  43     private static final WhiteBox WB = WhiteBox.getWhiteBox();
  44 
  45     private static boolean request() throws Exception {
  46         WB.requestConcurrentGCPhase("UNKNOWN PHASE");
  47         return false;
  48     }
  49 
  50     private static boolean checkUnknownPhase() throws Exception {
  51         System.out.println("Expecting IllegalArgumentException");
  52         try {
  53             return request();
  54         } catch (IllegalArgumentException e) {
  55             return true;
  56         }
  57     }
  58 
  59     private static boolean checkUnsupported() throws Exception {
  60         System.out.println("Expecting IllegalStateException");
  61         try {
  62             return request();
  63         } catch (IllegalStateException e) {
  64             return true;
  65         }
  66     }
  67 
  68     private static boolean check() throws Exception {
  69         if (WB.supportsConcurrentGCPhaseControl()) {
  70             return checkUnknownPhase();
  71         } else {
  72             return checkUnsupported();
  73         }
  74     }
  75 
  76     public static void main(String[] args) throws Exception {
  77         if (check()) {
  78             System.out.println("Got expected exception");
  79         } else {
  80             throw new RuntimeException("No exception thrown");
  81         }
  82     }
  83 }