1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/*
* Copyright (c) 2002, 2020, 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @bug 4625907 8246729
* @summary Testing force()
* @library /test/lib
* @build jdk.test.lib.RandomFactory
* @run main/othervm Force
* @key randomness
*/
import java.io.File;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import static java.nio.file.StandardOpenOption.*;
import java.util.Random;
import jdk.test.lib.RandomFactory;
public class Force {
public static void main(String[] args) throws Exception {
test1();
test2();
}
private static void test1() throws Exception {
Random random = RandomFactory.getRandom();
long filesize = random.nextInt(3*1024*1024);
int cut = random.nextInt((int)filesize);
File file = File.createTempFile("Blah", null);
file.deleteOnExit();
try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
raf.setLength(filesize);
FileChannel fc = raf.getChannel();
MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_WRITE, cut, filesize-cut);
mbb.force();
}
// improve chance that mapped buffer will be unmapped
System.gc();
Thread.sleep(500);
}
private static void test2() throws Exception {
var path = Files.createTempFile("test", "map");
var channel = FileChannel.open(path, READ, WRITE);
MappedByteBuffer buffer =
channel.map(FileChannel.MapMode.READ_WRITE, 0, 1000);
buffer.putInt(1234);
buffer.limit(4);
buffer.force();
}
}
|
