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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
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package jdk.jfr.api.consumer;

import java.nio.file.Files;
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;


/*
 * @test
 * @summary Reads the recorded file two times and verifies that both reads are the same
 * @key jfr
 * @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 = Files.createTempFile("recording", ".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();
    }
}