/*

 * Copyright (c) 2007, 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.

 *

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package vm.gc.compact;

import java.util.*;

import java.util.concurrent.atomic.AtomicInteger;

import nsk.share.test.*;

import nsk.share.gc.*;

import nsk.share.gc.gp.*;

/**

 * Test garbage collector compaction.

 *

 * The test starts several threads which create objects using

 * given garbage producer until OOM. The references are kept

 * in an array. The references to even elements are cleared

 * and objects of larger size are created until OOM. The garbage

 * collector will have to compact free space to free memory for

 * new objects.

 *

 * The size of the second half of created objects could be set explictly.

 *

 * This process is repeated.

 */

public class Compact extends ThreadedGCTest implements GarbageProducerAware, GarbageProducer1Aware, MemoryStrategyAware {

    private GarbageProducer garbageProducer;

    private GarbageProducer garbageProducer1;

    private MemoryStrategy memoryStrategy;

    private long size;

    private long size2;

    private static long customSize = 0;

    static AtomicInteger allocations = new AtomicInteger();

    private class Worker implements Runnable {

        private List<Object> bricks;

        private ExecutionController stresser;

        public void run() {

            if (stresser == null) {

                stresser = getExecutionController();

            }

            try {

                bricks = new ArrayList<Object>();

                while (stresser.continueExecution()) {

                    bricks.add(garbageProducer.create(size));

                }

            } catch (OutOfMemoryError e) {

            }

            if (bricks == null) {

                return;

            }

            int count = bricks.size();

            for (int i = 0; stresser.continueExecution() && i < count; i += 2) {

                bricks.set(i, null);

            }

            try {

                for (int i = 0; stresser.continueExecution() && i < count; i += 2) {

                    bricks.set(i, garbageProducer1.create(size2));

                    allocations.incrementAndGet();

                }

            } catch (OutOfMemoryError e) {

            }

            bricks = null;

        }

    }

    public Runnable createRunnable(int i) {

        return new Worker();

    }

    public void run() {

        size = memoryStrategy.getSize(runParams.getTestMemory());

        size2 = customSize == 0

                ? size2 = size * 2

                : customSize;

        super.run();

    }

    public final void setGarbageProducer(GarbageProducer garbageProducer) {

        this.garbageProducer = garbageProducer;

    }

    public final void setGarbageProducer1(GarbageProducer garbageProducer1) {

        this.garbageProducer1 = garbageProducer1;

    }

    public final void setMemoryStrategy(MemoryStrategy memoryStrategy) {

        this.memoryStrategy = memoryStrategy;

    }

    static void setHumongousSizeFromParams(String[] args) {

        for (int i = 0; i < args.length; ++i) {

            if (args[i].equals("-size2")) {

                customSize = Long.parseLong(args[i + 1]);

                return;

            }

        }

    }

    public static void main(String[] args) {

        setHumongousSizeFromParams(args);

        GC.runTest(new Compact(), args);

    }

}