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25 
26 package jdk.jfr.api.event;
27 
28 import java.time.Duration;
29 import java.util.List;
30 
31 import jdk.jfr.Event;
32 import jdk.jfr.Recording;
33 import jdk.jfr.consumer.RecordedEvent;
34 import jdk.test.lib.jfr.Events;
35 
36 /**
37  * @test
38  * @summary Enable an event from a static function in the event.
39  * @key jfr
40  * @requires vm.hasJFR
41  * @library /test/lib
42  * @run main/othervm jdk.jfr.api.event.TestStaticEnable
43  */
44 public class TestStaticEnable {
45 
main(String[] args)46     public static void main(String[] args) throws Exception {
47         Recording r = new Recording();
48         MyEvent.enable(r, true);
49         r.start();
50         MyEvent.create("Hello", 1);
51         r.stop();
52 
53         List<RecordedEvent> events = Events.fromRecording(r);
54         Events.hasEvents(events);
55         for (RecordedEvent event : events) {
56             System.out.println("Event:" + event);
57             Events.assertField(event, "msg").equal("Hello");
58             Events.assertField(event, "id").equal(1L);
59         }
60         r.close();
61     }
62 
63 
64     public static class MyEvent extends Event {
65         public String msg;
66         long id;
67 
enable(Recording r, boolean isEnabled)68         public static void enable(Recording r, boolean isEnabled) {
69             if (isEnabled) {
70                 r.enable(MyEvent.class).withThreshold(Duration.ofMillis(0)).withoutStackTrace();
71             } else {
72                 r.disable(MyEvent.class);
73             }
74         }
75 
create(String msg, long id)76         public static void create(String msg, long id) {
77             MyEvent event = new MyEvent();
78             event.msg = msg;
79             event.id = id;
80             event.begin();
81             event.end();
82             event.commit();
83         }
84     }
85 
86 }
87