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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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 *
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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 8765432
 * @summary Basic test for Unsafe::deallocate
 * @modules jdk.unsupported
 * @run testng DeallocateBuffer
 */

import java.lang.reflect.Field;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.Path;
import java.nio.file.Paths;
import sun.misc.Unsafe;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
import org.testng.annotations.DataProvider;
import static java.nio.file.StandardOpenOption.CREATE;
import static java.nio.file.StandardOpenOption.WRITE;

public class DeallocateBuffer {

    static Unsafe UNSAFE;

    @BeforeClass
    static void init() throws Exception {
        UNSAFE = getUnsafe();
    }

    @DataProvider(name = "non-direct")
    static Object[][] nonDirectBuffers() {
        return new Object[][] {
                { ByteBuffer.allocate(10) },
                { ByteBuffer.allocate(10).duplicate() },
                { ByteBuffer.allocate(10).slice() }
        };
    }

    @Test(dataProvider="non-direct",
          expectedExceptions = IllegalArgumentException.class)
    public void nonDirect(ByteBuffer buffer) throws Exception {
        UNSAFE.deallocate(buffer);
    }

    @DataProvider(name = "direct")
    static Object[][] directBuffers() throws Exception {
        byte[] srcData = new byte[20];
        for (int i=0; i<20; i++)
            srcData[i] = (byte)i;
        Path bob = Paths.get("bob");
        try (FileChannel fc = FileChannel.open(Paths.get("bob"), CREATE, WRITE)) {
            fc.write(ByteBuffer.wrap(srcData));
        }
        FileChannel fc = FileChannel.open(bob);
        MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0, 10);
        mbb.load();

        return new Object[][] {
                { ByteBuffer.allocateDirect(10) },
                { ByteBuffer.allocateDirect(10).duplicate() },
                { ByteBuffer.allocateDirect(10).slice() },
                { mbb },
                { mbb.duplicate() },
                { mbb.slice() },
                { fc.map(FileChannel.MapMode.READ_ONLY, 1, 11) }
        };
    }

    @Test(dataProvider="direct")
    public void direct(ByteBuffer buffer) throws Exception {
        UNSAFE.deallocate(buffer);
    }

    @Test(expectedExceptions = NullPointerException.class)
    public void npe() throws Exception {
        UNSAFE.deallocate(null);
    }

    static Unsafe getUnsafe() throws ReflectiveOperationException {
        Field f = Unsafe.class.getDeclaredField("theUnsafe");
        f.setAccessible(true);
        return (Unsafe)f.get(null);
    }
}