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1 /* |
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2 * Copyright (c) 2013, 2018, 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package jdk.jfr.event.runtime; |
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27 |
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28 import java.util.List; |
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29 |
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30 import jdk.jfr.Recording; |
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31 import jdk.jfr.consumer.RecordedEvent; |
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32 import jdk.test.lib.Asserts; |
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33 import jdk.test.lib.jfr.EventNames; |
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34 import jdk.test.lib.jfr.Events; |
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35 import jdk.test.lib.jfr.TestClassLoader; |
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36 |
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37 /* |
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38 * @test |
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39 * @key jfr |
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40 * @library /test/lib /test/jdk |
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41 * @build jdk.jfr.event.runtime.TestClasses |
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42 * @run main/othervm jdk.jfr.event.runtime.TestClassLoadingStatisticsEvent |
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43 */ |
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44 /** |
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45 * This test will load a number of classes. After each load step we verify that |
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46 * the loadedClassCount and unloadedClassCount attributes are correct. |
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47 * |
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48 * System.gc() will trigger class unloading if -XX:+ExplicitGCInvokesConcurrent |
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49 * is NOT set. If this flag is set G1 will never unload classes on System.gc() |
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50 * and CMS will not guarantee that all semantically dead classes will be |
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51 * unloaded. As far as the "jfr" key guarantees no VM flags are set from the |
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52 * outside it should be enough with System.gc(). |
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53 */ |
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54 public class TestClassLoadingStatisticsEvent { |
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55 |
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56 private final static String EVENT_PATH = EventNames.ClassLoadingStatistics; |
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57 private final static String TESTCLASS_PUBLIC_STATIC = |
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58 "jdk.jfr.event.runtime.TestClasses$TestClassPublicStatic"; |
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59 private final static String TESTCLASS_PUBLIC_STATIC_INNER = |
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60 "jdk.jfr.event.runtime.TestClasses$TestClassPublicStatic$TestClassPublicStaticInner"; |
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61 |
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62 // Declare unloadableClassLoader as "public static" |
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63 // to prevent the compiler to optimize away all unread writes |
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64 public static TestClassLoader unloadableClassLoader; |
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65 |
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66 public static void main(String[] args) throws Throwable { |
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67 // Load twice to get more stable result. |
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68 RecordedEvent event = getCurrentEvent(); |
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69 event = getCurrentEvent(); |
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70 |
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71 // Declare class ClassLoadingStatisticsHelper. |
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72 TestClasses[] helpers = new TestClasses[10]; |
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73 event = verifyCountDelta(event, 1, 0); |
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74 |
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75 // Should load classes TestClassPrivate and TestClassPrivateStatic. |
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76 for (int c = 0; c < helpers.length; c++) { |
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77 helpers[c] = new TestClasses(); |
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78 } |
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79 event = verifyCountDelta(event, 2, 0); |
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80 |
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81 // Load classes TestClassProtected and B2. |
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82 helpers[0].new TestClassProtected(); |
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83 helpers[1].new TestClassProtected(); // This class is already loaded. |
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84 new TestClasses.TestClassProtectedStatic(); |
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85 event = verifyCountDelta(event, 2, 0); |
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86 |
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87 // Load classes TestClassProtected1 and TestClassProtectedStatic1. |
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88 for (int c = 0; c < helpers.length; c++) { |
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89 helpers[c].loadClasses(); |
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90 } |
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91 event = verifyCountDelta(event, 2, 0); |
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92 |
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93 // Load the classes with separate class loader. Will be unloaded later. |
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94 unloadableClassLoader = new TestClassLoader(); |
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95 |
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96 unloadableClassLoader.loadClass(TESTCLASS_PUBLIC_STATIC_INNER); |
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97 event = verifyCountDelta(event, 1, 0); |
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98 |
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99 unloadableClassLoader.loadClass(TESTCLASS_PUBLIC_STATIC); |
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100 event = verifyCountDelta(event, 1, 0); |
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101 |
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102 // This System.gc() should not unload classes, since the |
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103 // unloadableClassLoader object is still active. |
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104 System.gc(); |
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105 event = verifyCountDelta(event, 0, 0); |
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106 |
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107 // make classes are unloaded. |
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108 unloadableClassLoader = null; |
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109 System.gc(); |
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110 event = verifyCountDelta(event, 0, 2); |
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111 } |
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112 |
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113 private static RecordedEvent getCurrentEvent() throws Throwable { |
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114 Recording recording = new Recording(); |
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115 recording.enable(EVENT_PATH); |
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116 recording.start(); |
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117 recording.stop(); |
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118 List<RecordedEvent> events = Events.fromRecording(recording); |
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119 Asserts.assertFalse(events.isEmpty(), "No events in recording"); |
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120 RecordedEvent event = events.get(0); |
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121 return event; |
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122 } |
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123 |
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124 private static RecordedEvent verifyCountDelta( |
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125 RecordedEvent prevEvent, int loadDelta, int unloadDelta) throws Throwable { |
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126 RecordedEvent currEvent = null; |
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127 try { |
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128 long prevLoad = Events.assertField(prevEvent, "loadedClassCount").getValue(); |
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129 long prevUnload = Events.assertField(prevEvent, "unloadedClassCount").getValue(); |
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130 |
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131 currEvent = getCurrentEvent(); |
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132 Events.assertField(currEvent, "loadedClassCount").atLeast(prevLoad + loadDelta); |
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133 Events.assertField(currEvent, "unloadedClassCount").atLeast(prevUnload + unloadDelta); |
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134 return currEvent; |
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135 } catch (Throwable t) { |
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136 System.out.println("verifyCountDelta failed. prevEvent=" + prevEvent + ", currEvent=" + currEvent); |
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137 throw t; |
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138 } |
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139 } |
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140 |
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141 } |