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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).

 *

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package jdk.jfr.startupargs;

import java.util.ArrayList;

import java.util.List;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.internal.test.WhiteBox;

import jdk.test.lib.jfr.EventNames;

import jdk.test.lib.jfr.Events;

/**

 * @test

 * @summary Test -XX:FlightRecorderOptions=old-object-queue-size

 * @requires vm.hasJFR

 * @modules jdk.jfr/jdk.jfr.internal.test

 * @library /test/lib

 * @key jfr

 *

 */

public class TestOldObjectQueueSize {

    private static final int OBJECT_COUNT = 10_000;

    private static final int DEFAULT_OLD_OBJECT_QUEUE_SIZE = 256;

    public final static List<Object> leak = new ArrayList<>(OBJECT_COUNT);

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

        WhiteBox.setWriteAllObjectSamples(true);

        System.out.println("TESTING: " + args[0]);

        String amount = args[0];

        try (Recording recording = new Recording()) {

            recording.enable(EventNames.OldObjectSample).withoutStackTrace().with("cutoff", "infinity");

            recording.start();

            // It's hard to get a larger number of samples without running into OOM

            // since the TLAB size increases when there is more allocation.

            // Allocate 200 MB, which should give at least 400 samples if the TLAB

            // size manages to stay below 512kb, which logging with -Xlog:gc+tlab=trace indicates.

            for (int i = 0; i < OBJECT_COUNT; i++) {

                leak.add(new byte[20_000]);

            }

            recording.stop();

            List<RecordedEvent> events = Events.fromRecording(recording);

            System.out.println("Found samples: " + events.size());

            if (amount.equals("off")) {

                if (!events.isEmpty()) {

                    throw new Exception("No objects shuld be emitted when queue size 0");

                }

            }

            if (amount.equals("many")) {

                // Sanity check that we at least have managed to set a value above the default

                if (events.size() <= DEFAULT_OLD_OBJECT_QUEUE_SIZE) {

                    throw new Exception("Should be at least be " + DEFAULT_OLD_OBJECT_QUEUE_SIZE + ", but found " + events.size());

                }

            }

        }

    }

}