20249
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 import java.util.Objects;
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25 import java.util.function.BiConsumer;
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26 import java.util.function.Function;
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27 import sun.hotspot.WhiteBox;
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28 import sun.management.*;
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29 import com.sun.management.*;
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30 import com.oracle.java.testlibrary.*;
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31
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32 public final class VmFlagTest<T> {
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33 public static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
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34
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35 private static final String NONEXISTENT_FLAG = "NonexistentFlag";
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36 private final String flagName;
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37 private final BiConsumer<T, T> test;
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38 private final BiConsumer<String, T> set;
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39 private final Function<String, T> get;
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40
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41 protected VmFlagTest(String flagName, BiConsumer<String, T> set,
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42 Function<String, T> get, boolean isPositive) {
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43 this.flagName = flagName;
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44 this.set = set;
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45 this.get = get;
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46 if (isPositive) {
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47 test = this::testPositive;
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48 } else {
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49 test = this::testNegative;
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50 }
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51 }
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52
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53 private void setNewValue(T value) {
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54 set.accept(flagName, value);
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55 }
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56
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57 private T getValue() {
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58 T t = get.apply(flagName);
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59 System.out.println("T = " + t);
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60 return t;
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61 }
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62
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63 protected static <T> void runTest(String existentFlag, T[] tests,
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64 BiConsumer<String, T> set, Function<String, T> get) {
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65 runTest(existentFlag, tests, tests, set, get);
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66 }
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67
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68 protected static <T> void runTest(String existentFlag, T[] tests,
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69 T[] results, BiConsumer<String, T> set, Function<String, T> get) {
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70 if (existentFlag != null) {
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71 new VmFlagTest(existentFlag, set, get, true).test(tests, results);
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72 }
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73 new VmFlagTest(NONEXISTENT_FLAG, set, get, false).test(tests, results);
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74 }
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75
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76 public final void test(T[] tests, T[] results) {
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77 Asserts.assertEQ(tests.length, results.length, "[TESTBUG] tests.length != results.length");
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78 for (int i = 0, n = tests.length ; i < n; ++i) {
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79 test.accept(tests[i], results[i]);
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80 }
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81 }
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82
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83 protected String getVMOptionAsString() {
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84 HotSpotDiagnosticMXBean diagnostic
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85 = ManagementFactoryHelper.getDiagnosticMXBean();
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86 VMOption tmp;
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87 try {
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88 tmp = diagnostic.getVMOption(flagName);
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89 } catch (IllegalArgumentException e) {
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90 tmp = null;
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91 }
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92 return tmp == null ? null : tmp.getValue();
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93 }
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94
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95 private void testPositive(T value, T expected) {
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96 Asserts.assertEQ(getVMOptionAsString(), asString(getValue()));
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97 setNewValue(value);
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98 String newValue = getVMOptionAsString();
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99 Asserts.assertEQ(newValue, asString(expected));
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100 Asserts.assertEQ(getVMOptionAsString(), asString(getValue()));
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101 }
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102
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103 private void testNegative(T value, T expected) {
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104 String oldValue = getVMOptionAsString();
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105 Asserts.assertEQ(oldValue, asString(getValue()));
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106 setNewValue(value);
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107 String newValue = getVMOptionAsString();
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108 Asserts.assertEQ(oldValue, newValue);
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109 }
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110
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111 private String asString(Object value) {
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112 return value == null ? null : "" + value;
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113 }
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114 }
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115
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