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25 package jdk.jfr.api.consumer;
26 
27 import static jdk.test.lib.Asserts.assertEquals;
28 import static jdk.test.lib.Asserts.assertFalse;
29 import static jdk.test.lib.Asserts.assertNotNull;
30 import static jdk.test.lib.Asserts.assertTrue;
31 
32 import java.util.List;
33 
34 import jdk.jfr.Event;
35 import jdk.jfr.Recording;
36 import jdk.jfr.consumer.RecordedEvent;
37 import jdk.jfr.consumer.RecordedFrame;
38 import jdk.jfr.consumer.RecordedMethod;
39 import jdk.jfr.consumer.RecordedStackTrace;
40 import jdk.test.lib.jfr.Events;
41 
42 
43 /**
44  * @test
45  * @summary Verifies that the method descriptor is correct
46  * @key jfr
47  * @requires vm.hasJFR
48  * @library /test/lib
49  * @run main/othervm jdk.jfr.api.consumer.TestRecordedMethodDescriptor
50  */
51 public final class TestRecordedMethodDescriptor {
52 
53     public static class MyEvent extends Event {
54     }
55 
56     private static final String MAIN_METHOD_DESCRIPTOR = "([Ljava/lang/String;)V";
57     private static final String MAIN_METHOD_NAME = "main";
58 
main(String[] args)59     public static void main(String[] args) throws Exception  {
60         try (Recording recording = new Recording()) {
61             recording.enable(MyEvent.class);
62             recording.start();
63 
64             MyEvent event = new MyEvent();
65             event.commit();
66             recording.stop();
67 
68             List<RecordedEvent> recordedEvents = Events.fromRecording(recording);
69             assertEquals(1, recordedEvents.size(), "Expected one event");
70             RecordedEvent recordedEvent = recordedEvents.get(0);
71 
72             RecordedStackTrace stacktrace = recordedEvent.getStackTrace();
73             List<RecordedFrame> frames = stacktrace.getFrames();
74             assertFalse(frames.isEmpty(), "Stacktrace frames was empty");
75 
76             boolean foundMainMethod = false;
77             for (RecordedFrame frame : frames) {
78                 RecordedMethod method = frame.getMethod();
79                 String descr = method.getDescriptor();
80                 assertNotNull(descr, "Method descriptor is null");
81                 String name = method.getName();
82                 assertNotNull(name, "Method name is null");
83                 if (name.equals(MAIN_METHOD_NAME) && descr.equals(MAIN_METHOD_DESCRIPTOR)) {
84                     assertFalse(foundMainMethod, "main() method descriptor already recorded");
85                     foundMainMethod = true;
86                 }
87             }
88             assertTrue(foundMainMethod, "main() method descriptor has never been recorded");
89         }
90     }
91 }
92