/*

 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

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

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * 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

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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package jdk.jfr.event.oldobject;

import java.util.ArrayList;

import java.util.List;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedClass;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.consumer.RecordedObject;

import jdk.jfr.internal.test.WhiteBox;

import jdk.test.lib.jfr.EventNames;

import jdk.test.lib.jfr.Events;

 * @test

 * @key jfr

 * @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.TestArrayInformation

 */

public class TestArrayInformation {

    private static class ArrayLeak {

    }

    private static final int CHAIN_DEPTH = 50;

    private static final int ARRAY_SIZE = 52;

    private static final int ARRAY_INDEX = 26;

    public static List<Object> leak = new ArrayList<>(25);

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

        WhiteBox.setWriteAllObjectSamples(true);

        try (Recording recording = new Recording()) {

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

            recording.start();

            for(int i = 0; i < 25; i++) {

              leak.add( buildNestedArray(CHAIN_DEPTH));

            }

            recording.stop();

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

            Events.hasEvents(events);

            verifyObjectArray(events);

        }

    }

    private static void verifyObjectArray(List<RecordedEvent> events) throws Exception {

        for (RecordedEvent e : events) {

            RecordedObject object = e.getValue("object");

            RecordedClass objectType = object.getValue("type");

            RecordedObject referrer = object.getValue("referrer");

            System.out.println(objectType.getName());

            if (objectType.getName().equals(ArrayLeak[].class.getName())) {

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

                    object = referrer.getValue("object");

                    if (object == null) {

                        throw new Exception("Expected referrer object");

                    }

                    objectType = object.getValue("type");

                    if (!objectType.getName().equals(Object[].class.getName())) {

                        throw new Exception("Expect array class to be named " + Object[].class + " but found " + objectType.getName());

                    }

                    RecordedObject field = referrer.getValue("field");

                    if (field != null) {

                        throw new Exception("Didn't expect to find field");

                    }

                    RecordedObject array = referrer.getValue("array");

                    if (array == null) {

                        throw new Exception("Expected array object, but got null");

                    }

                    int index = referrer.getValue("array.index");

                    if (index != ARRAY_INDEX) {

                        throw new Exception("Expected array index: " + ARRAY_INDEX + ", but got " + index);

                    }

                    int size = referrer.getValue("array.size");

                    if (size != ARRAY_SIZE) {

                        throw new Exception("Expected array size: " + ARRAY_SIZE + ", but got " + size);

                    }

                    referrer = object.getValue("referrer");

                }

                return;

            }

        }

        throw new Exception("Could not find event with " + ArrayLeak[].class + " as (leak) object");

    }

    private static Object buildNestedArray(int depth) {

        if (depth > 0) {

            Object[] array = new Object[ARRAY_SIZE];

            array[ARRAY_INDEX] = buildNestedArray(depth - 1);

            return array;

        } else {

            return new ArrayLeak[OldObjects.MIN_SIZE];

        }

    }

}