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

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package jdk.jfr.api.consumer;

import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.jfr.consumer.RecordedThread;
import jdk.test.lib.Asserts;
import jdk.test.lib.jfr.Events;
import jdk.test.lib.jfr.SimpleEvent;

/**
 * @test
 * @summary Tests that chunks are read in order and constant pools from multiple chunks can be read
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib
 * @run main/othervm jdk.jfr.api.consumer.TestRecordingInternals
 */
public class TestRecordingInternals {

    public static void main(String[] args) throws Throwable {
        try (Recording continuous = new Recording()) {
            continuous.start();
            for (int i = 0; i < 3; i++) {
                // Each new recording will create a new chunk
                // with a new set of constant pools, i.e.
                // constant pools for threads and thread groups
                createProfilingRecording(i);
            }
            continuous.stop();
            int i = 0;
            for (RecordedEvent e : Events.fromRecording(continuous)) {
                Integer id = e.getValue("id");
                RecordedThread rt = e.getThread();
                Asserts.assertEquals(id.toString(), rt.getJavaName(), "Thread name should match id");
                Asserts.assertEquals(id.toString(), rt.getThreadGroup().getName(), "Thread group name should match id");
                Asserts.assertEquals(id, Integer.valueOf(i), "Chunks out of order");
                i++;
                System.out.println(i + " OK ");
            }
        }
    }

    private static void createProfilingRecording(int id) throws InterruptedException {
        try (Recording r = new Recording()) {
            r.start();
            ThreadGroup tg = new ThreadGroup(String.valueOf(id));
            Thread t = new Thread(tg, () -> {
                SimpleEvent event = new SimpleEvent();
                event.id = id;
                event.commit();
            }, String.valueOf(id));
            t.start();
            t.join();
            r.stop();
        }
    }
}