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 package gc.concurrent_phase_control;

    25 

    26 /*

    27  * Utility class that provides verification of expected behavior of

    28  * the Concurrent GC Phase Control WB API when the current GC does not

    29  * support phase control.  The invoking test must provide WhiteBox access.

    30  */

    31 

    32 import sun.hotspot.WhiteBox;

    33 

    34 public class CheckUnsupported {

    35 

    36     private static final WhiteBox WB = WhiteBox.getWhiteBox();

    37 

    38     public static void check(String gcName) throws Exception {

    39         // Verify unsupported.

    40         if (WB.supportsConcurrentGCPhaseControl()) {

    41             throw new RuntimeException(

    42                 gcName + " unexpectedly supports phase control");

    43         }

    44 

    45         // Verify phase sequence is empty.

    46         String[] phases = WB.getConcurrentGCPhases();

    47         if (phases.length > 0) {

    48             throw new RuntimeException(

    49                 gcName + " unexpectedly has non-empty phases");

    50         }

    51 

    52         // Verify IllegalStateException thrown by request attempt.

    53         boolean illegalStateThrown = false;

    54         try {

    55             WB.requestConcurrentGCPhase("UNKNOWN PHASE");

    56         } catch (IllegalStateException e) {

    57             // Expected.

    58             illegalStateThrown = true;

    59         } catch (Exception e) {

    60             throw new RuntimeException(

    61                 gcName + ": Unexpected exception when requesting phase: "

    62                 + e.toString());

    63         }

    64         if (!illegalStateThrown) {

    65             throw new RuntimeException(

    66                 gcName + ": No exception when requesting phase");

    67         }

    68     }

    69 }

    70