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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.event.oldobject;

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

 * @key jfr

 * @requires vm.hasJFR

 * @requires vm.gc == "null"

 * @library /test/lib /test/jdk

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

 * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestReferenceChainLimit

 */

public class TestReferenceChainLimit {

    private final static int TEST_CHAIN_LENGTH_FACTOR = 10; // scaling factor for the how long chain to be used in the test

    final static class ChainNode {

        final ChainNode next;

        byte[] leak;

        public ChainNode(ChainNode node) {

            next = node;

            leak = new byte[10_000];

        }

    }

    private static ChainNode createChain() {

        ChainNode node = null;

        final int testChainLength = OldObjects.MAX_CHAIN_LENGTH * TEST_CHAIN_LENGTH_FACTOR;

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

            node = new ChainNode(node);

        }

        return node;

    }

    public static ChainNode leak;

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

        WhiteBox.setWriteAllObjectSamples(true);

        try (Recording r = new Recording()) {

            r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");

            r.start();

            leak = createChain();

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

            if (OldObjects.countMatchingEvents(events, byte[].class, null, null, -1, "createChain") == 0) {

                throw new Exception("Could not find ChainNode");

            }

            for (RecordedEvent e : events) {

                OldObjects.validateReferenceChainLimit(e, OldObjects.MAX_CHAIN_LENGTH);

            }

        }

    }

}