jdk8-mips64-public/hotspot: test/testlibrary_tests/whitebox/vm

     1 /*

     2  * Copyright (c) 2014, 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  */

    24 import java.util.Objects;

    25 import java.util.function.BiConsumer;

    26 import java.util.function.Function;

    27 import sun.hotspot.WhiteBox;

    28 import sun.management.*;

    29 import com.sun.management.*;

    30 import com.oracle.java.testlibrary.*;

    32 public final class VmFlagTest<T> {

    33     public static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();

    35     private static final String NONEXISTENT_FLAG = "NonexistentFlag";

    36     private final String flagName;

    37     private final BiConsumer<T, T> test;

    38     private final BiConsumer<String, T> set;

    39     private final Function<String, T> get;

    41     protected VmFlagTest(String flagName, BiConsumer<String, T> set,

    42             Function<String, T> get, boolean isPositive) {

    43         this.flagName = flagName;

    44         this.set = set;

    45         this.get = get;

    46         if (isPositive) {

    47             test = this::testPositive;

    48         } else {

    49             test = this::testNegative;

    50         }

    51     }

    53     private void setNewValue(T value) {

    54         set.accept(flagName, value);

    55     }

    57     private T getValue() {

    58         return get.apply(flagName);

    59     }

    61     protected static <T> void runTest(String existentFlag, T[] tests,

    62             BiConsumer<String, T> set, Function<String, T> get) {

    63         runTest(existentFlag, tests, tests, set, get);

    64     }

    66     protected static <T> void runTest(String existentFlag, T[] tests,

    67             T[] results, BiConsumer<String, T> set, Function<String, T> get) {

    68         if (existentFlag != null) {

    69             new VmFlagTest(existentFlag, set, get, true).test(tests, results);

    70         }

    71         new VmFlagTest(NONEXISTENT_FLAG, set, get, false).test(tests, results);

    72     }

    74     public final void test(T[] tests, T[] results) {

    75         Asserts.assertEQ(tests.length, results.length, "[TESTBUG] tests.length != results.length");

    76         for (int i = 0, n = tests.length ; i < n; ++i) {

    77             test.accept(tests[i], results[i]);

    78         }

    79     }

    81     protected String getVMOptionAsString() {

    82         HotSpotDiagnosticMXBean diagnostic

    83                 = ManagementFactoryHelper.getDiagnosticMXBean();

    84         VMOption tmp;

    85         try {

    86             tmp = diagnostic.getVMOption(flagName);

    87         } catch (IllegalArgumentException e) {

    88             tmp = null;

    89         }

    90         return tmp == null ? null : tmp.getValue();

    91     }

    93     private void testPositive(T value, T expected) {

    94         Asserts.assertEQ(getVMOptionAsString(), asString(getValue()));

    95         setNewValue(value);

    96         String newValue = getVMOptionAsString();

    97         Asserts.assertEQ(newValue, asString(expected));

    98         Asserts.assertEQ(getVMOptionAsString(), asString(getValue()));

    99     }

   101     private void testNegative(T value, T expected) {

   102         String oldValue = getVMOptionAsString();

   103         Asserts.assertEQ(oldValue, asString(getValue()));

   104         setNewValue(value);

   105         String newValue = getVMOptionAsString();

   106         Asserts.assertEQ(oldValue, newValue);

   107     }

   109     private String asString(Object value) {

   110         return value == null ? null : "" + value;

   111     }

   112 }

test/testlibrary_tests/whitebox/vm_flags/VmFlagTest.java@8c95980d0b66