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25 package jdk.jfr.event.gc.detailed;
26 
27 import java.nio.file.Paths;
28 import java.util.List;
29 
30 import jdk.jfr.EventType;
31 import jdk.jfr.FlightRecorder;
32 import jdk.jfr.Recording;
33 import jdk.jfr.consumer.RecordedEvent;
34 import jdk.test.lib.Asserts;
35 import jdk.test.lib.jfr.EventNames;
36 import jdk.test.lib.jfr.Events;
37 import jdk.test.lib.jfr.GCHelper;
38 
39 public class TestG1HeapRegionInformationEvent {
40     private final static String EVENT_NAME = EventNames.G1HeapRegionInformation;
main(String[] args)41     public static void main(String[] args) throws Exception {
42         Recording recording = null;
43         try {
44             recording = new Recording();
45             // activate the event we are interested in and start recording
46             for (EventType t : FlightRecorder.getFlightRecorder().getEventTypes()) {
47                 System.out.println(t.getName());
48             }
49             recording.enable(EVENT_NAME);
50             recording.start();
51             recording.stop();
52 
53             // Verify recording
54             List<RecordedEvent> events = Events.fromRecording(recording);
55             Events.hasEvents(events);
56 
57             for (RecordedEvent event : events) {
58                 Events.assertField(event, "index").notEqual(-1);
59                 Asserts.assertTrue(GCHelper.isValidG1HeapRegionType(Events.assertField(event, "type").getValue()));
60                 Events.assertField(event, "used").atMost(1L*1024*1024);
61             }
62 
63         } catch (Throwable t) {
64             if (recording != null) {
65                 recording.dump(Paths.get("TestG1HeapRegionInformationEvent.jfr"));
66             }
67             throw t;
68         } finally {
69             if (recording != null) {
70                 recording.close();
71             }
72         }
73     }
74 }
75