test/jdk/jdk/jfr/api/consumer/filestream/TestMultipleChunk.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * accompanied this code).
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package jdk.jfr.api.consumer.filestream;

import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.atomic.AtomicLong;

import jdk.jfr.Event;
import jdk.jfr.Recording;
import jdk.jfr.consumer.EventStream;

/**
 * @test
 * @summary Verifies that it is possible to stream contents from a multichunked file
 * @key jfr
 * @requires vm.hasJFR
 * @library /test/lib
 * @run main/othervm jdk.jfr.api.consumer.filestream.TestMultipleChunk
 */
public class TestMultipleChunk {

    static class SnakeEvent extends Event {
        int id;
    }

    public static void main(String... args) throws Exception {
        Path path = Paths.get("./using-file.jfr");
        try (Recording r1 = new Recording()) {
            r1.start();
            emitSnakeEvent(1);
            emitSnakeEvent(2);
            emitSnakeEvent(3);
            // Force a chunk rotation
            try (Recording r2 = new Recording()) {
                r2.start();
                emitSnakeEvent(4);
                emitSnakeEvent(5);
                emitSnakeEvent(6);
                r2.stop();
            }
            r1.stop();
            r1.dump(path);
            AtomicLong counter = new AtomicLong();
            try (EventStream es = EventStream.openFile(path)) {
                es.onEvent(e -> {
                    counter.incrementAndGet();
                });
                es.start();
                if (counter.get() != 6) {
                    throw new Exception("Expected 6 event, but got " + counter.get());
                }
            }
        }
    }

    static void emitSnakeEvent(int id) {
        SnakeEvent e = new SnakeEvent();
        e.id = id;
        e.commit();
    }

}