1 /* 2 * Copyright (c) 2013, 2019, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.jfr.event.runtime; 27 28 import static jdk.test.lib.Asserts.assertEquals; 29 import static jdk.test.lib.Asserts.assertTrue; 30 31 import java.lang.management.ManagementFactory; 32 33 import com.sun.management.HotSpotDiagnosticMXBean; 34 35 import jdk.jfr.Recording; 36 import jdk.jfr.consumer.RecordedEvent; 37 import jdk.test.lib.jfr.EventNames; 38 import jdk.test.lib.jfr.Events; 39 40 /** 41 * @test TestVmFlagChangedEvent 42 * @key jfr 43 * @requires vm.hasJFR 44 * @library /test/lib 45 * @modules jdk.jfr 46 * jdk.management 47 * 48 * @run main/othervm jdk.jfr.event.runtime.TestVmFlagChangedEvent 49 */ 50 public final class TestVmFlagChangedEvent { 51 main(String[] args)52 public static void main(String[] args) throws Throwable { 53 EventFlag[] eventFlags = { 54 new EventFlag(EventNames.StringFlagChanged, "HeapDumpPath", "/a/sample/path"), 55 new EventFlag(EventNames.BooleanFlagChanged, "HeapDumpOnOutOfMemoryError", "true") 56 }; 57 58 Recording recording = new Recording(); 59 for (EventFlag eventFlag : eventFlags) { 60 recording.enable(eventFlag.eventName); 61 } 62 63 recording.start(); 64 HotSpotDiagnosticMXBean mbean = ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class); 65 for (EventFlag eventFlag : eventFlags) { 66 eventFlag.update(mbean); 67 } 68 recording.stop(); 69 70 for (RecordedEvent event : Events.fromRecording(recording)) { 71 final String flagName = Events.assertField(event, "name").getValue(); 72 System.out.println("flag name=" + flagName); 73 for (EventFlag eventFlag : eventFlags) { 74 if (flagName.equals(eventFlag.eventLabel)) { 75 System.out.println("Event:" + event); 76 Object newValue = Events.assertField(event, "newValue").getValue(); 77 Object oldValue = Events.assertField(event, "oldValue").getValue(); 78 System.out.println("newValue:" + asText(newValue)); 79 System.out.println("oldValue:" + asText(oldValue)); 80 assertEquals(eventFlag.newValue, asText(newValue), "Wrong new value: expected" + eventFlag.newValue); 81 assertEquals(eventFlag.oldValue, asText(oldValue), "Wrong old value: expected" + eventFlag.oldValue); 82 Events.assertField(event, "origin").equal("Management"); 83 eventFlag.isFound = true; 84 break; 85 } 86 } 87 } 88 for (EventFlag eventFlag : eventFlags) { 89 assertTrue(eventFlag.isFound, "Missing flag change for: " + eventFlag.eventLabel); 90 } 91 } 92 asText(Object value)93 private static String asText(Object value) { 94 if (value == null) { 95 return ""; // HotSpotDiagnosticMXBean interface return "" for unset values 96 } 97 return String.valueOf(value); 98 } 99 100 private static class EventFlag { 101 final String eventName; 102 final String eventLabel; 103 String newValue; 104 String oldValue; 105 boolean isFound = false; 106 EventFlag(String eventName, String eventLabel, String newValue)107 EventFlag(String eventName, String eventLabel, String newValue) { 108 this.eventName = eventName; 109 this.eventLabel = eventLabel; 110 this.newValue = newValue; 111 } 112 update(HotSpotDiagnosticMXBean mbean)113 void update(HotSpotDiagnosticMXBean mbean) { 114 this.oldValue = mbean.getVMOption(eventLabel).getValue(); 115 mbean.setVMOption(eventLabel, newValue); 116 } 117 } 118 } 119