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 read 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 PreadDirect
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 com.sun.nio.file.ExtendedOpenOption;
45
46 import jdk.test.lib.RandomFactory;
47
48 /**
49 * Testing FileChannel's positional read method.
50 */
51
52 public class PreadDirect {
53
54 private static PrintStream err = System.err;
55
56 private static Random generator = RandomFactory.getRandom();
57
58 private static int CHARS_PER_GROUP = 4096;
59
60 public static void main(String[] args) throws Exception {
61 genericTest1();
62 genericTest2();
63 testNegativePosition();
64 }
65
66 private static void testNegativePosition() throws Exception {
67 Path p = Files.createTempFile(Paths.get(
68 System.getProperty("test.dir", ".")), "test", null);
69 OutputStream fos = Files.newOutputStream(p);
70 fos.write(new byte[4096]);
71 fos.close();
72
73 FileChannel fc = FileChannel.open(p, ExtendedOpenOption.DIRECT);
74
75 try {
76 fc.read(ByteBuffer.allocate(4096), -1L);
77 throw new RuntimeException("Expected exception not thrown");
78 } catch(IllegalArgumentException e) {
79 // Correct result
80 } finally {
81 fc.close();
82 Files.delete(p);
83 }
84 }
85
86 private static void genericTest2() throws Exception {
87 Path p = Files.createTempFile(Paths.get(
88 System.getProperty("test.dir", ".")), "test", null);
89 OutputStream fos = Files.newOutputStream(p);
90 fos.write(new byte[4096]);
91 fos.close();
92
93 FileChannel fc = FileChannel.open(p, ExtendedOpenOption.DIRECT);
94 try {
95 fc.read(ByteBuffer.allocate(4096), 4000);
96 throw new RuntimeException("Expected exception not thrown");
97 } catch(IOException e) {
98 if (!e.getMessage().contains("Channel position is not "
99 + "a multiple of the block size"))
100 throw new RuntimeException("Read test failed");
101 } finally {
102 fc.close();
103 Files.delete(p);
104 }
105 }
106
107 private static void genericTest1() throws Exception {
108 StringBuffer sb = new StringBuffer();
109 sb.setLength(2);
110
111 Path p = Files.createTempFile(Paths.get(
112 System.getProperty("test.dir", ".")), "test", null);
113 initTestFile(p);
114
115 FileChannel c = FileChannel.open(p, ExtendedOpenOption.DIRECT);
116 FileStore fs = Files.getFileStore(p);
117 int alignment = (int)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)
124 .alignedSlice(alignment);
125
126 long originalPosition = c.position();
127
128 int totalRead = 0;
129 while (totalRead < 4096) {
130 int read = c.read(block, offset);
131 if (read < 0)
132 throw new Exception("Read failed");
133 totalRead += read;
134 }
135
136 long newPosition = c.position();
137
138 for (int i=0; i<2; i++) {
139 byte aByte = block.get(i);
140 sb.setCharAt(i, (char)aByte);
141 }
142 int result = Integer.parseInt(sb.toString());
143 if (result != expectedResult) {
144 err.println("I expected "+ expectedResult);
145 err.println("I got "+ result);
146 throw new Exception("Read test failed");
147 }
148
149 // Ensure that file pointer position has not changed
150 if (originalPosition != newPosition)
151 throw new Exception("File position modified");
152 }
153
154 c.close();
155 Files.delete(p);
156 }
157
158 private static void initTestFile(Path p) throws Exception {
159 OutputStream fos = Files.newOutputStream(p);
160 BufferedWriter awriter
161 = new BufferedWriter(new OutputStreamWriter(fos, "8859_1"));
162
163 for(int i=0; i<100; i++) {
164 String number = new Integer(i).toString();
165 for (int h=0; h<2-number.length(); h++)
166 awriter.write("0");
167 awriter.write(""+i);
168 for (int j=0; j < 4094; j++)
169 awriter.write("0");
170 }
171 awriter.flush();
172 awriter.close();
173 }
174 }