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package jdk.jfr.api.consumer.streaming;

import java.util.Random;

import jdk.jfr.Event;

import jdk.jfr.consumer.RecordingStream;

/**

 * @test

 * @summary Test that it is possible to iterate over chunk with normal events

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib

 * @run main/othervm jdk.jfr.api.consumer.streaming.TestFilledChunks

 */

public class TestFilledChunks {

    static class FillEvent extends Event {

        String message;

        int value;

        int id;

    }

    static class EndEvent extends Event {

    }

    // Will generate about 100 MB of data, or 8-9 chunks

    private static final int EVENT_COUNT = 5_000_000;

    public static void main(String... args) throws Exception {

        try (RecordingStream rs = new RecordingStream()) {

            rs.onEvent(FillEvent.class.getName(), e -> {

                int id = e.getInt("id");

                // Some events may get lost due to

                // buffer being full.

                if (id > EVENT_COUNT / 2) {

                    rs.close();

                }

            });

            rs.startAsync();

            long seed = System.currentTimeMillis();

            System.out.println("Random seed: " + seed);

            Random r = new Random(seed);

            for (int i = 1; i < EVENT_COUNT; i++) {

                FillEvent f = new FillEvent();

                f.message = i % 2 == 0 ? "hello, hello, hello, hello, hello!" : "hi!";

                f.value = r.nextInt(10000);

                f.id = i;

                f.commit();

                if (i % 1_000_000 == 0) {

                    System.out.println("Emitted " + i + " events");

                }

            }

            rs.awaitTermination();

        }

    }

}