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package jdk.jfr.api.consumer;

import java.nio.file.Path;

import java.util.LinkedList;

import java.util.List;

import jdk.jfr.Event;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.consumer.RecordingFile;

import jdk.test.lib.Asserts;

import jdk.test.lib.Utils;

/**

 * @test

 * @summary Reads the recorded file two times and verifies that both reads are the same

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib

 * @run main/othervm jdk.jfr.api.consumer.TestReadTwice

 */

public class TestReadTwice {

    private static class MyEvent extends Event {

    }

    public static void main(String[] args) throws Throwable {

        Recording r = new Recording();

        r.enable(MyEvent.class).withoutStackTrace();

        r.start();

        // Commit a single event to the recording

        MyEvent event = new MyEvent();

        event.commit();

        r.stop();

        // Dump the recording to a file

        Path path = Utils.createTempFile("read-twice", ".jfr");

        System.out.println("Dumping to " + path);

        r.dump(path);

        r.close();

        // Read all events from the file in one go

        List<RecordedEvent> events = RecordingFile.readAllEvents(path);

        // Read again the same events one by one

        RecordingFile rfile = new RecordingFile(path);

        List<RecordedEvent> events2 = new LinkedList<>();

        while (rfile.hasMoreEvents()) {

            events2.add(rfile.readEvent());

        }

        // Compare sizes

        Asserts.assertEquals(events.size(), events2.size());

        rfile.close();

    }

}