1 /*
2 * Copyright (c) 2000, 2010, 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 4862382
26 * @summary Test positional read method of FileChannel with DirectIO
27 * @key randomness
28 */
29
30 import java.io.*;
31 import java.nio.ByteBuffer;
32 import java.nio.CharBuffer;
33 import java.nio.channels.*;
34 import java.nio.channels.FileChannel;
35 import java.util.Random;
36 import java.nio.file.Paths;
37 import java.nio.file.Path;
38 import java.nio.file.Files;
39 import java.nio.file.FileStore;
40 import com.sun.nio.file.ExtendedOpenOption;
41
42 /**
43 * Testing FileChannel's positional read method.
44 */
45
46 public class PreadDirect {
47
48 private static PrintStream err = System.err;
49
50 private static Random generator = new Random();
51
52 private static int CHARS_PER_GROUP = 4096;
53
54 public static void main(String[] args) throws Exception {
55 genericTest1();
56 genericTest2();
57 testNegativePosition(); // This test for bug 4862382
58 }
59
60 // This test for bug 4862382
61 private static void testNegativePosition() throws Exception {
62 File blah = File.createTempFile("blah1", null);
63 blah.deleteOnExit();
64 FileOutputStream fos = new FileOutputStream(blah);
65 fos.write(new byte[4096]);
66 fos.close();
67
68 String path = blah.getAbsolutePath();
69 Path p = Paths.get(path);
70 FileChannel fc = FileChannel.open(p, ExtendedOpenOption.DIRECT);
71
72 try {
73 fc.read(ByteBuffer.allocate(4096), -1L);
74 throw new RuntimeException("Expected exception not thrown");
75 } catch(IllegalArgumentException e) {
76 // Correct result
77 } finally {
78 fc.close();
79 blah.delete();
80 }
81 }
82
83 private static void genericTest2() throws Exception {
84 File blah = File.createTempFile("blah2", null);
85 blah.deleteOnExit();
86 FileOutputStream fos = new FileOutputStream(blah);
87 fos.write(new byte[4096]);
88 fos.close();
89
90 String path = blah.getAbsolutePath();
91 Path p = Paths.get(path);
92 FileChannel fc = FileChannel.open(p, ExtendedOpenOption.DIRECT);
93 try {
94 fc.read(ByteBuffer.allocate(4096), 4000);
95 throw new RuntimeException("Expected exception not thrown");
96 } catch(IllegalArgumentException e) {
97 if (!e.getMessage().contains("IO size or position is not aligned"))
98 throw new RuntimeException("Read test failed");
99 } finally {
100 fc.close();
101 blah.delete();
102 }
103 }
104
105 private static void genericTest1() throws Exception {
106 StringBuffer sb = new StringBuffer();
107 sb.setLength(2);
108
109 File blah = File.createTempFile("blah3", null);
110 blah.deleteOnExit();
111 initTestFile(blah);
112
113 String path = blah.getAbsolutePath();
114 Path p = Paths.get(path);
115 FileChannel c = FileChannel.open(p, ExtendedOpenOption.DIRECT);
116 FileStore fs = Files.getFileStore(p);
117 int alignment = fs.getBlockSize();
118
119 for (int x=0; x<100; x++) {
120 long offset = generator.nextInt(100) * 4096;
121 long expectedResult = offset / CHARS_PER_GROUP;
122 offset = expectedResult * CHARS_PER_GROUP;
123 ByteBuffer block = ByteBuffer.allocateDirect(4096 + alignment - 1).alignedSlice(alignment);
124
125 long originalPosition = c.position();
126
127 int totalRead = 0;
128 while (totalRead < 4096) {
129 int read = c.read(block, offset);
130 if (read < 0)
131 throw new Exception("Read failed");
132 totalRead += read;
133 }
134
135 long newPosition = c.position();
136
137 for (int i=0; i<2; i++) {
138 byte aByte = block.get(i);
139 sb.setCharAt(i, (char)aByte);
140 }
141 int result = Integer.parseInt(sb.toString());
142 if (result != expectedResult) {
143 err.println("I expected "+ expectedResult);
144 err.println("I got "+ result);
145 throw new Exception("Read test failed");
146 }
147
148 // Ensure that file pointer position has not changed
149 if (originalPosition != newPosition)
150 throw new Exception("File position modified");
151 }
152
153 c.close();
154 blah.delete();
155 }
156
157 /**
158 * Creates file blah:
159 */
160 private static void initTestFile(File blah) throws Exception {
161 FileOutputStream fos = new FileOutputStream(blah);
162 BufferedWriter awriter
163 = new BufferedWriter(new OutputStreamWriter(fos, "8859_1"));
164
165 for(int i=0; i<100; i++) {
166 String number = new Integer(i).toString();
167 for (int h=0; h<2-number.length(); h++)
168 awriter.write("0");
169 awriter.write(""+i);
170 for (int j=0; j < 4094; j++)
171 awriter.write("0");
172 }
173 awriter.flush();
174 awriter.close();
175 }
176 }