package jdk.jfr.api.consumer.streaming;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.time.Duration;

import java.time.Instant;

import java.util.concurrent.CountDownLatch;

import jdk.jfr.Event;

import jdk.jfr.Recording;

import jdk.jfr.consumer.EventStream;

import jdk.jfr.jcmd.JcmdHelper;

/**

 * @test

 * @summary Verifies that is possible to stream from a repository that is being

 *          moved.

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib /test/jdk

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

 */

public class TestRepositoryMigration {

    static class MigrationEvent extends Event {

        int id;

    }

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

        Path newRepository = Paths.get("new-repository");

        CountDownLatch events = new CountDownLatch(2);

        try (EventStream es = EventStream.openRepository()) {

            es.setStartTime(Instant.EPOCH);

            es.onEvent(e -> {

                System.out.println(e);

                if (e.getInt("id") == 1) {

                    events.countDown();

                }

                if (e.getInt("id") == 2) {

                    events.countDown();

                }

            });

            es.startAsync();

            try (Recording r = new Recording()) {

                r.setFlushInterval(Duration.ofSeconds(1));

                r.start();

                // Chunk in default repository

                MigrationEvent e1 = new MigrationEvent();

                e1.id = 1;

                e1.commit();

               JcmdHelper.jcmd("JFR.configure", "repositorypath=" + newRepository.toAbsolutePath());

                // Chunk in new repository

                MigrationEvent e2 = new MigrationEvent();

                e2.id = 2;

                e2.commit();

                r.stop();

                events.await();

                // Verify that it happened in new repository

                if (!Files.exists(newRepository)) {

                    throw new AssertionError("Could not find repository " + newRepository);

                }

                System.out.println("Listing contents in new repository:");

                boolean empty= true;

                for (Path p: Files.newDirectoryStream(newRepository)) {

                    System.out.println(p.toAbsolutePath());

                    empty = false;

                }

                System.out.println();

                if (empty) {

                    throw new AssertionError("Could not find contents in new repository location " + newRepository);

                }

            }

        }

    }

}