test/jdk/jdk/jfr/api/consumer/TestRecordedMethodDescriptor.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package jdk.jfr.api.consumer;

import static jdk.test.lib.Asserts.assertEquals;
import static jdk.test.lib.Asserts.assertFalse;
import static jdk.test.lib.Asserts.assertNotNull;
import static jdk.test.lib.Asserts.assertTrue;

import java.util.List;

import jdk.jfr.Event;
import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.jfr.consumer.RecordedMethod;
import jdk.jfr.consumer.RecordedFrame;
import jdk.jfr.consumer.RecordedStackTrace;
import jdk.test.lib.jfr.Events;


/*
 * @test
 * @key jfr
 * @library /test/lib
 * @run main/othervm jdk.jfr.api.consumer.TestRecordedMethodDescriptor
 */
public final class TestRecordedMethodDescriptor {

    private static boolean isMainMethodDescriptorRecorded;
    private static final String MAIN_METHOD_DESCRIPTOR = "([Ljava/lang/String;)V";
    private static final String MAIN_METHOD_NAME = "main";

    public static void main(String[] args) throws Throwable {
        Recording recording = new Recording();
        recording.enable(MyEvent.class).withStackTrace();
        recording.start();

        MyEvent event = new MyEvent();
        event.begin();
        event.end();
        event.commit();
        recording.stop();

        List<RecordedEvent> recordedEvents = Events.fromRecording(recording);
        assertEquals(1, recordedEvents.size(), "Expected one event");
        RecordedEvent recordedEvent = recordedEvents.get(0);

        RecordedStackTrace stacktrace = recordedEvent.getStackTrace();
        List<RecordedFrame> frames = stacktrace.getFrames();
        assertFalse(frames.isEmpty(), "Stacktrace frames was empty");
        for (RecordedFrame frame : frames) {
            analyzeRecordedMethodDescriptor(frame.getMethod());
        }

        assertTrue(isMainMethodDescriptorRecorded, "main() method descriptor has never been recorded");
    }

    private static void analyzeRecordedMethodDescriptor(RecordedMethod method) {

        String descr = method.getDescriptor();
        assertNotNull(descr, "Method descriptor is null");
        String name = method.getName();
        assertNotNull(name, "Method name is null");

        if (name.equals(MAIN_METHOD_NAME) && descr.equals(MAIN_METHOD_DESCRIPTOR)) {
            assertFalse(isMainMethodDescriptorRecorded, "main() method descriptor already recorded");
            isMainMethodDescriptorRecorded = true;
        }
    }

    public static class MyEvent extends Event {
    }

}