1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   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 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 checkHasPhases(boolean supported) {
  46         System.out.println("Expecting " + (supported ? "non-" : "") + "empty phase list");
  47         String[] phases = WB.getConcurrentGCPhases();
  48         return phases.length != 0;
  49     }
  50 
  51     private static boolean request() throws Exception {
  52         WB.requestConcurrentGCPhase("UNKNOWN PHASE");
  53         return false;
  54     }
  55 
  56     private static boolean checkUnknownPhase() throws Exception {
  57         System.out.println("Expecting IllegalArgumentException");
  58         try {
  59             return request();
  60         } catch (IllegalArgumentException e) {
  61             return true;
  62         }
  63     }
  64 
  65     private static boolean checkSupported() throws Exception {
  66         return checkHasPhases(true) && checkUnknownPhase();
  67     }
  68 
  69     private static boolean checkUnsupportedRequest() throws Exception {
  70         System.out.println("Expecting IllegalStateException");
  71         try {
  72             return request();
  73         } catch (IllegalStateException e) {
  74             return true;
  75         }
  76     }
  77 
  78     private static boolean checkUnsupported() throws Exception {
  79         return !checkHasPhases(false) && checkUnsupportedRequest();
  80     }
  81 
  82     private static boolean check() throws Exception {
  83         if (WB.supportsConcurrentGCPhaseControl()) {
  84             return checkSupported();
  85         } else {
  86             return checkUnsupported();
  87         }
  88     }
  89 
  90     public static void main(String[] args) throws Exception {
  91         if (!check()) {
  92             throw new RuntimeException("Test failed");
  93         }
  94     }
  95 }