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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