J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001-2003 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 4452020 4629048 4638365 4869859 |
| 26 | * @summary Test FileChannel scattering reads |
| 27 | */ |
| 28 | |
| 29 | import java.nio.channels.*; |
| 30 | import java.nio.*; |
| 31 | import java.io.*; |
| 32 | |
| 33 | public class ScatteringRead { |
| 34 | |
| 35 | private static final int NUM_BUFFERS = 3; |
| 36 | |
| 37 | private static final int BUFFER_CAP = 3; |
| 38 | |
| 39 | private static final int BIG_BUFFER_CAP = Integer.MAX_VALUE / 3 + 10; |
| 40 | |
| 41 | public static void main(String[] args) throws Exception { |
| 42 | test1(); // for bug 4452020 |
| 43 | test2(); // for bug 4629048 |
| 44 | System.gc(); |
| 45 | |
| 46 | // Test 3 proves that the system is capable of reading |
| 47 | // more than MAX_INT bytes in one shot. But it is unsuitable |
| 48 | // for automated testing because oftentimes less bytes are |
| 49 | // read for various reasons, and this is allowed by the spec. |
| 50 | // test3(); // for bug 4638365 |
| 51 | } |
| 52 | |
| 53 | private static void test1() throws Exception { |
| 54 | ByteBuffer dstBuffers[] = new ByteBuffer[NUM_BUFFERS]; |
| 55 | for (int i=0; i<NUM_BUFFERS; i++) |
| 56 | dstBuffers[i] = ByteBuffer.allocateDirect(BUFFER_CAP); |
| 57 | File blah = File.createTempFile("blah1", null); |
| 58 | blah.deleteOnExit(); |
| 59 | createTestFile(blah); |
| 60 | |
| 61 | FileInputStream fis = new FileInputStream(blah); |
| 62 | FileChannel fc = fis.getChannel(); |
| 63 | |
| 64 | byte expectedResult = -128; |
| 65 | for (int k=0; k<20; k++) { |
| 66 | long bytesRead = fc.read(dstBuffers); |
| 67 | for (int i=0; i<NUM_BUFFERS; i++) { |
| 68 | for (int j=0; j<BUFFER_CAP; j++) { |
| 69 | byte b = dstBuffers[i].get(j); |
| 70 | if (b != expectedResult++) |
| 71 | throw new RuntimeException("Test failed"); |
| 72 | } |
| 73 | dstBuffers[i].flip(); |
| 74 | } |
| 75 | } |
| 76 | fis.close(); |
| 77 | } |
| 78 | |
| 79 | private static void createTestFile(File blah) throws Exception { |
| 80 | FileOutputStream fos = new FileOutputStream(blah); |
| 81 | for(int i=-128; i<128; i++) |
| 82 | fos.write((byte)i); |
| 83 | fos.flush(); |
| 84 | fos.close(); |
| 85 | } |
| 86 | |
| 87 | private static void test2() throws Exception { |
| 88 | ByteBuffer dstBuffers[] = new ByteBuffer[2]; |
| 89 | for (int i=0; i<2; i++) |
| 90 | dstBuffers[i] = ByteBuffer.allocateDirect(10); |
| 91 | File blah = File.createTempFile("blah2", null); |
| 92 | blah.deleteOnExit(); |
| 93 | FileOutputStream fos = new FileOutputStream(blah); |
| 94 | for(int i=0; i<15; i++) |
| 95 | fos.write((byte)92); |
| 96 | fos.flush(); |
| 97 | fos.close(); |
| 98 | |
| 99 | FileInputStream fis = new FileInputStream(blah); |
| 100 | FileChannel fc = fis.getChannel(); |
| 101 | |
| 102 | long bytesRead = fc.read(dstBuffers); |
| 103 | if (dstBuffers[1].limit() != 10) |
| 104 | throw new Exception("Scattering read changed buf limit."); |
| 105 | fis.close(); |
| 106 | } |
| 107 | |
| 108 | private static void test3() throws Exception { |
| 109 | // Only works on 64 bit Solaris |
| 110 | String osName = System.getProperty("os.name"); |
| 111 | if (!osName.startsWith("SunOS")) |
| 112 | return; |
| 113 | String dataModel = System.getProperty("sun.arch.data.model"); |
| 114 | if (!dataModel.startsWith("64")) |
| 115 | return; |
| 116 | |
| 117 | ByteBuffer dstBuffers[] = new ByteBuffer[NUM_BUFFERS]; |
| 118 | File f = File.createTempFile("test3", null); |
| 119 | f.deleteOnExit(); |
| 120 | prepTest3File(f, (long)BIG_BUFFER_CAP); |
| 121 | RandomAccessFile raf = new RandomAccessFile(f, "rw"); |
| 122 | FileChannel fc = raf.getChannel(); |
| 123 | MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_WRITE, 0, |
| 124 | BIG_BUFFER_CAP); |
| 125 | for (int i=0; i<NUM_BUFFERS; i++) { |
| 126 | dstBuffers[i] = mbb; |
| 127 | } |
| 128 | fc.close(); |
| 129 | raf.close(); |
| 130 | |
| 131 | // Source must be large |
| 132 | FileInputStream fis = new FileInputStream("/dev/zero"); |
| 133 | fc = fis.getChannel(); |
| 134 | |
| 135 | long bytesRead = fc.read(dstBuffers); |
| 136 | if (bytesRead <= Integer.MAX_VALUE) |
| 137 | throw new RuntimeException("Test 3 failed "+bytesRead+" < "+Integer.MAX_VALUE); |
| 138 | |
| 139 | fc.close(); |
| 140 | fis.close(); |
| 141 | } |
| 142 | |
| 143 | static void prepTest3File(File blah, long testSize) throws Exception { |
| 144 | RandomAccessFile raf = new RandomAccessFile(blah, "rw"); |
| 145 | FileChannel fc = raf.getChannel(); |
| 146 | fc.write(ByteBuffer.wrap("Use the source!".getBytes()), testSize - 40); |
| 147 | fc.close(); |
| 148 | raf.close(); |
| 149 | } |
| 150 | |
| 151 | } |