1 /*
2 * Copyright (c) 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /* @test
25 * @bug 8164900
26 * @summary Test positional write method of FileChannel with DirectIO
27 * (use -Dseed=X to set PRNG seed)
28 * @library .. /test/lib
29 * @build jdk.test.lib.RandomFactory
30 * @run main PwriteDirect
31 * @key randomness
32 */
33
34 import java.io.*;
35 import java.nio.ByteBuffer;
36 import java.nio.CharBuffer;
37 import java.nio.channels.*;
38 import java.nio.channels.FileChannel;
39 import java.util.Random;
40 import java.nio.file.Paths;
41 import java.nio.file.Path;
42 import java.nio.file.Files;
43 import java.nio.file.FileStore;
44 import java.nio.file.StandardOpenOption;
45 import com.sun.nio.file.ExtendedOpenOption;
46
47 import jdk.test.lib.RandomFactory;
48
49 /**
50 * Testing FileChannel's positional write method.
51 */
52 public class PwriteDirect {
53
54 private static Random generator = RandomFactory.getRandom();
55
56 public static void main(String[] args) throws Exception {
57 genericTest();
58 testUnwritableChannel();
59 }
60
61 private static void testUnwritableChannel() throws Exception {
62 Path p = Files.createTempFile(Paths.get(
63 System.getProperty("test.dir", ".")), "test", null);
64 OutputStream fos = Files.newOutputStream(p);
65 fos.write(new byte[4096]);
66 fos.close();
67
68 FileChannel fc = FileChannel.open(p, ExtendedOpenOption.DIRECT);
69
70 try {
71 fc.write(ByteBuffer.allocate(4096),0);
72 throw new RuntimeException("Expected exception not thrown");
73 } catch(NonWritableChannelException e) {
74 // Correct result
75 } finally {
76 fc.close();
77 Files.delete(p);
78 }
79 }
80
81 private static void genericTest() throws Exception {
82 Path p = Files.createTempFile(Paths.get(
83 System.getProperty("test.dir", ".")), "test", null);
84 initTestFile(p);
85
86 FileChannel c = FileChannel.open(p, StandardOpenOption.WRITE,
87 StandardOpenOption.READ, ExtendedOpenOption.DIRECT);
88 FileStore fs = Files.getFileStore(p);
89 int alignment = (int)fs.getBlockSize();
90
91 for (int x=0; x<100; x++) {
92 long offset = generator.nextInt(100) * 4096;
93 ByteBuffer block = ByteBuffer.allocateDirect(4096 + alignment - 1)
94 .alignedSlice(alignment);
95
96 // Write known sequence out
97 for (byte i=0; i<4; i++) {
98 block.put(i);
99 }
100 block.position(0);
101 long originalPosition = c.position();
102 int totalWritten = 0;
103 while (totalWritten < 4096) {
104 int written = c.write(block, offset);
105 if (written < 0)
106 throw new Exception("Write failed");
107 totalWritten += written;
108 }
109
110 long newPosition = c.position();
111
112 // Ensure that file pointer position has not changed
113 if (originalPosition != newPosition)
114 throw new Exception("File position modified");
115
116 // Attempt to read sequence back in
117 block = ByteBuffer.allocateDirect(4096 + alignment - 1)
118 .alignedSlice(alignment);
119 originalPosition = c.position();
120 int totalRead = 0;
121 while (totalRead < 4096) {
122 int read = c.read(block, offset);
123 if (read < 0)
124 throw new Exception("Read failed");
125 totalRead += read;
126 }
127 newPosition = c.position();
128
129 // Ensure that file pointer position has not changed
130 if (originalPosition != newPosition)
131 throw new Exception("File position modified");
132
133 for (byte i=0; i<4; i++) {
134 if (block.get(i) != i)
135 throw new Exception("Write test failed");
136 }
137 }
138 c.close();
139 Files.delete(p);
140 }
141
142 private static void initTestFile(Path p) throws Exception {
143 OutputStream fos = Files.newOutputStream(p);
144 BufferedWriter awriter
145 = new BufferedWriter(new OutputStreamWriter(fos, "8859_1"));
146
147 for(int i=0; i<100; i++) {
148 String number = new Integer(i).toString();
149 for (int h=0; h<4-number.length(); h++)
150 awriter.write("0");
151 awriter.write(""+i);
152 for (int j=0; j < 4092; j++)
153 awriter.write("0");
154 }
155 awriter.flush();
156 awriter.close();
157 }
158 }