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25 
26 package jdk.jfr.event.runtime;
27 
28 import static jdk.test.lib.Asserts.assertTrue;
29 
30 import java.nio.file.Paths;
31 import java.time.Duration;
32 import java.util.concurrent.CountDownLatch;
33 
34 import jdk.jfr.Recording;
35 import jdk.jfr.consumer.RecordedEvent;
36 import jdk.test.lib.jfr.EventNames;
37 import jdk.test.lib.jfr.Events;
38 import jdk.test.lib.thread.TestThread;
39 import jdk.test.lib.thread.XRun;
40 
41 /**
42  * @test TestJavaMonitorInflateEvent
43  * @key jfr
44  *
45  * @library /lib /
46  * @run main/othervm jdk.jfr.event.runtime.TestJavaMonitorInflateEvent
47  */
48 public class TestJavaMonitorInflateEvent {
49 
50     private static final String FIELD_KLASS_NAME = "monitorClass.name";
51     private static final String FIELD_ADDRESS    = "address";
52     private static final String FIELD_CAUSE      = "cause";
53 
54     private static final String EVENT_NAME = EventNames.JavaMonitorInflate;
55     private static final long WAIT_TIME = 123456;
56 
57     static class Lock {
58     }
59 
main(String[] args)60     public static void main(String[] args) throws Exception {
61         Recording recording = new Recording();
62         recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0));
63         final Lock lock = new Lock();
64         final CountDownLatch latch = new CountDownLatch(1);
65         // create a thread that waits
66         TestThread waitThread = new TestThread(new XRun() {
67             @Override
68             public void xrun() throws Throwable {
69                 synchronized (lock) {
70                     latch.countDown();
71                     lock.wait(WAIT_TIME);
72                 }
73             }
74         });
75         try {
76             recording.start();
77             waitThread.start();
78             latch.await();
79             synchronized (lock) {
80                 lock.notifyAll();
81             }
82         } finally {
83             waitThread.join();
84             recording.stop();
85         }
86         final String thisThreadName = Thread.currentThread().getName();
87         final String waitThreadName = waitThread.getName();
88         final String lockClassName = lock.getClass().getName().replace('.', '/');
89         boolean isAnyFound = false;
90         try {
91             // Find at least one event with the correct monitor class and check the other fields
92             for (RecordedEvent event : Events.fromRecording(recording)) {
93                 assertTrue(EVENT_NAME.equals(event.getEventType().getName()), "mismatched event types?");
94                 // Check recorded inflation event is associated with the Lock class used in the test
95                 final String recordedMonitorClassName = Events.assertField(event, FIELD_KLASS_NAME).getValue();
96                 if (!lockClassName.equals(recordedMonitorClassName)) {
97                     continue;
98                 }
99                 // Check recorded thread matches one of the threads in the test
100                 final String recordedThreadName = event.getThread().getJavaName();
101                 if (!(recordedThreadName.equals(waitThreadName) || recordedThreadName.equals(thisThreadName))) {
102                     continue;
103                 }
104                 Events.assertField(event, FIELD_ADDRESS).notEqual(0L);
105                 isAnyFound = true;
106                 break;
107             }
108             assertTrue(isAnyFound, "Expected an inflation event from test");
109         } catch (Throwable e) {
110             recording.dump(Paths.get("failed.jfr"));
111             throw e;
112         } finally {
113             recording.close();
114         }
115     }
116 }
117