1 /*

     2  * Copyright 2003 Sun Microsystems, Inc.  All Rights Reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /* @test

    25  * @bug 4802340

    26  * @summary Testing force(), load() isLoaded() of zero len MBB

    27  */

    28 

    29 import java.io.*;

    30 import java.nio.*;

    31 import java.util.*;

    32 import java.nio.channels.*;

    33 

    34 public class ZeroMap {

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

    36         Random random = new Random();

    37         long filesize = random.nextInt(1024*1024);

    38         int cut = random.nextInt((int)filesize);

    39         File file = new File("Blah");

    40         RandomAccessFile raf = new RandomAccessFile(file, "rw");

    41         raf.setLength(filesize);

    42         FileChannel fc = raf.getChannel();

    43         MappedByteBuffer buf1 = fc.map(

    44                         FileChannel.MapMode.READ_WRITE, cut, 0);

    45         buf1.force();

    46         buf1.load();

    47         buf1.isLoaded();

    48         fc.close();

    49         raf.close();

    50     }

    51 }