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

 *

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

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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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 * 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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 */

/* @test

 * @bug 8171377

 * @summary Basic test for Unsafe::invokeCleaner

 * @modules jdk.unsupported

 * @run testng/othervm InvokeCleaner

 */

import java.io.Closeable;

import java.lang.reflect.Field;

import java.nio.ByteBuffer;

import java.nio.MappedByteBuffer;

import java.nio.channels.FileChannel;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.ArrayList;

import java.util.List;

import sun.misc.Unsafe;

import org.testng.annotations.AfterClass;

import org.testng.annotations.BeforeClass;

import org.testng.annotations.Test;

import org.testng.annotations.DataProvider;

public class InvokeCleaner {

    static Unsafe UNSAFE;

    static Path bob = Paths.get("bob");

    static List<Closeable> closeables = new ArrayList<>();

    @BeforeClass

    static void init() throws Exception {

        UNSAFE = getUnsafe();

        byte[] srcData = new byte[20];

        for (int i=0; i<20; i++)

            srcData[i] = (byte)i;

        Files.write(bob, srcData);

    }

    @DataProvider(name = "badBuffers")

    static Object[][] createBadBuffers() throws Exception {

        FileChannel fc = FileChannel.open(bob);

        closeables.add(fc);

        MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0, 10);

        return new Object[][] {

                { ByteBuffer.allocate(0) },

                { ByteBuffer.allocate(10) },

                { ByteBuffer.allocate(10).duplicate() },

                { ByteBuffer.allocate(10).slice() },

                { ByteBuffer.allocateDirect(10).duplicate() },

                { ByteBuffer.allocateDirect(10).slice() },

                { ByteBuffer.allocateDirect(0).duplicate() },

                { ByteBuffer.allocateDirect(0).slice() },

                { mbb.duplicate() },

                { mbb.slice() }

        };

    }

    @Test(dataProvider="badBuffers",

          expectedExceptions = IllegalArgumentException.class)

    public void badBuffers(ByteBuffer buffer) throws Exception {

        UNSAFE.invokeCleaner(buffer);

    }

    @DataProvider(name = "goodBuffers")

    static Object[][] createGoodBuffers() throws Exception {

        FileChannel fc = FileChannel.open(bob);

        closeables.add(fc);

        MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0, 10);

        mbb.load();

        return new Object[][] {

                { ByteBuffer.allocateDirect(0) },

                { ByteBuffer.allocateDirect(10) },

                { mbb },

                { fc.map(FileChannel.MapMode.READ_ONLY, 1, 11) }

        };

    }

    @Test(dataProvider="goodBuffers")

    public void goodBuffers(ByteBuffer buffer) throws Exception {

        UNSAFE.invokeCleaner(buffer);

    }

    @Test(expectedExceptions = NullPointerException.class)

    public void npe() throws Exception {

        UNSAFE.invokeCleaner(null);

    }

    static Unsafe getUnsafe() throws ReflectiveOperationException {

        Field f = Unsafe.class.getDeclaredField("theUnsafe");

        f.setAccessible(true);

        return (Unsafe)f.get(null);

    }

    @AfterClass

    public void cleanup() throws Exception {

        for(Closeable fc : closeables)

            fc.close();

    }

}