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package jdk.jfr.api.consumer.recordingstream;

import java.util.concurrent.CountDownLatch;

import jdk.jfr.Event;

import jdk.jfr.consumer.RecordingStream;

/**

 * @test

 * @summary Tests RecordingStream::startAsync()

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib

 * @run main/othervm jdk.jfr.api.consumer.recordingstream.TestStartAsync

 */

public class TestStartAsync {

    static class StartEvent extends Event {

    }

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

        testStart();

        testStartTwice();

        testStartClosed();

    }

    private static void testStartTwice() throws Exception {

        try (RecordingStream rs = new RecordingStream()) {

            rs.startAsync();

            try {

                rs.startAsync();

                throw new AssertionError("Expected IllegalStateException if started twice");

            } catch (IllegalStateException ise) {

                // OK, as expected

            }

        }

    }

    static void testStart() throws Exception {

        CountDownLatch started = new CountDownLatch(1);

        try (RecordingStream rs = new RecordingStream()) {

            rs.onEvent(e -> {

                started.countDown();

            });

            rs.startAsync();

            StartEvent e = new StartEvent();

            e.commit();

            started.await();

        }

    }

    static void testStartClosed() {

        RecordingStream rs = new RecordingStream();

        rs.close();

        try {

            rs.startAsync();

            throw new AssertionError("Expected IllegalStateException");

        } catch (IllegalStateException ise) {

            // OK, as expected.

        }

    }

}