268 lines
9.8 KiB
Java
268 lines
9.8 KiB
Java
/*
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* Copyright (c) 2017, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @bug 8164900
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* @summary Test read method of FileChannel with DirectIO
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* (use -Dseed=X to set PRNG seed)
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* @library .. /test/lib
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* @build jdk.test.lib.RandomFactory
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* DirectIOTest
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* @run main/othervm ReadDirect
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* @key randomness
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*/
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import java.io.*;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.channels.*;
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import java.nio.file.Files;
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import java.nio.file.FileStore;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.StandardOpenOption;
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import java.util.Random;
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import com.sun.nio.file.ExtendedOpenOption;
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import jdk.test.lib.RandomFactory;
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public class ReadDirect {
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private static PrintStream err = System.err;
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private static Random generator = RandomFactory.getRandom();
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private static int charsPerGroup = -1;
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private static int alignment = -1;
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private static boolean initTests() throws Exception {
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Path p = DirectIOTest.createTempFile();
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try {
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FileStore fs = Files.getFileStore(p);
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alignment = (int)fs.getBlockSize();
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charsPerGroup = alignment;
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} finally {
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Files.delete(p);
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}
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return true;
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}
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private static void testWithSingleBuffer() throws Exception {
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StringBuffer sb = new StringBuffer();
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sb.setLength(2);
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Path p = DirectIOTest.createTempFile();
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initTestFile(p);
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try (FileChannel fc = FileChannel.open(p,
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StandardOpenOption.READ, StandardOpenOption.DELETE_ON_CLOSE,
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ExtendedOpenOption.DIRECT)) {
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ByteBuffer block = ByteBuffer.allocateDirect(charsPerGroup
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+ alignment - 1).alignedSlice(alignment);
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for (int x = 0; x < 100; x++) {
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block.clear();
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long offset = x * charsPerGroup;
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long expectedResult = offset / charsPerGroup;
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fc.read(block);
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for (int i = 0; i < 2; i++) {
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byte aByte = block.get(i);
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sb.setCharAt(i, (char)aByte);
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}
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int result = Integer.parseInt(sb.toString());
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if (result != expectedResult) {
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err.println("I expected " + expectedResult);
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err.println("I got " + result);
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throw new Exception("Read test failed");
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}
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}
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}
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}
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private static void testWithNotAlignedBufferSize() throws Exception {
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int bufferSize = charsPerGroup - 1;
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Path p = DirectIOTest.createTempFile();
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try (OutputStream fos = Files.newOutputStream(p)) {
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fos.write(new byte[bufferSize]);
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}
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try (FileChannel fc = FileChannel.open(p,
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StandardOpenOption.READ, StandardOpenOption.DELETE_ON_CLOSE,
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ExtendedOpenOption.DIRECT)) {
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ByteBuffer block = ByteBuffer.allocate(bufferSize);
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try {
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fc.read(block);
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throw new RuntimeException("Expected exception not thrown");
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} catch (IOException e) {
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if (!e.getMessage().contains("Number of remaining bytes ("
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+ bufferSize + ") is not a multiple of the block size ("
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+ alignment + ")"))
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throw new Exception("Read test failed");
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}
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}
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}
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private static void testWithNotAlignedBufferOffset() throws Exception {
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int bufferSize = charsPerGroup * 2;
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int pos = alignment - 1;
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Path p = DirectIOTest.createTempFile();
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try (OutputStream fos = Files.newOutputStream(p)) {
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fos.write(new byte[bufferSize]);
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}
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try (FileChannel fc = FileChannel.open(p,
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StandardOpenOption.READ, StandardOpenOption.DELETE_ON_CLOSE,
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ExtendedOpenOption.DIRECT)) {
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ByteBuffer block = ByteBuffer.allocateDirect(bufferSize);
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block.position(pos);
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block.limit(bufferSize - 1);
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try {
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fc.read(block);
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throw new RuntimeException("Expected exception not thrown");
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} catch (IOException e) {
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if (!e.getMessage().contains("Current position of the bytebuffer "
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+ "(" + pos + ") is not a multiple of the block size ("
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+ alignment + ")"))
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throw new Exception("Read test failed");
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}
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}
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}
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private static void testWithArrayOfBuffer() throws Exception {
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StringBuffer sb = new StringBuffer();
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sb.setLength(2);
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ByteBuffer[] dests = new ByteBuffer[4];
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Path p = DirectIOTest.createTempFile();
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initTestFile(p);
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try (FileChannel fc = FileChannel.open(p,
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StandardOpenOption.READ, StandardOpenOption.DELETE_ON_CLOSE,
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ExtendedOpenOption.DIRECT)) {
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int randomNumber = -1;
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for (int i = 0; i < 4; i++) {
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dests[i] = ByteBuffer.allocateDirect
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(charsPerGroup + alignment - 1).alignedSlice(alignment);
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for (int j = 0; j < charsPerGroup; j++) {
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dests[i].put(j, (byte)'a');
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}
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}
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// The size of the test FileChannel is 100*charsPerGroup.
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// As the channel bytes will be scattered into two buffers
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// each of size charsPerGroup, the offset cannot be greater
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// than 98*charsPerGroup, so the value of randomNumber must
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// be in the range [0,98], i.e., 0 <= randomNumber < 99.
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randomNumber = generator.nextInt(99);
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long offset = randomNumber * charsPerGroup;
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fc.position(offset);
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fc.read(dests, 1, 2);
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for (int i = 0; i < 4; i++) {
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if (i == 1 || i == 2) {
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for (int j = 0; j < 2; j++) {
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byte aByte = dests[i].get(j);
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sb.setCharAt(j, (char)aByte);
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}
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int result = Integer.parseInt(sb.toString());
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int expectedResult = randomNumber + i - 1;
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if (result != expectedResult) {
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err.println("I expected " + expectedResult);
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err.println("I got " + result);
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throw new Exception("Read test failed");
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}
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} else {
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for (int k = 0; k < charsPerGroup; k++) {
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if (dests[i].get(k) != (byte)'a')
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throw new RuntimeException("Read test failed");
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}
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}
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}
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}
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}
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public static void testOnEOF() throws Exception {
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int bufferSize = charsPerGroup / 2;
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Path p = DirectIOTest.createTempFile();
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try (OutputStream fos = Files.newOutputStream(p)) {
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byte[] writeBlock = new byte[bufferSize];
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for (int i = 0; i < bufferSize; i++) {
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writeBlock[i] = ((byte)'a');
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}
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fos.write(writeBlock);
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}
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try (FileChannel fc = FileChannel.open(p,
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StandardOpenOption.READ, StandardOpenOption.DELETE_ON_CLOSE,
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ExtendedOpenOption.DIRECT)) {
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ByteBuffer block = ByteBuffer.allocateDirect(
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(bufferSize / alignment + 1) * alignment + alignment - 1)
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.alignedSlice(alignment);
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int result = fc.read(block);
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if (result != bufferSize) {
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err.println("Number of bytes to read " + bufferSize);
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err.println("I read " + result);
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throw new Exception("Read test failed");
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}
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for (int j = 0; j < bufferSize; j++) {
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if (block.get(j) != (byte)'a')
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throw new RuntimeException("Read test failed");
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}
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}
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}
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public static void main(String[] args) throws Exception {
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if (initTests()) {
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testWithSingleBuffer();
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testWithNotAlignedBufferSize();
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testWithNotAlignedBufferOffset();
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testWithArrayOfBuffer();
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testOnEOF();
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}
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}
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private static void initTestFile(Path p)
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throws Exception {
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try (OutputStream fos = Files.newOutputStream(p)) {
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try (BufferedWriter awriter
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= new BufferedWriter(new OutputStreamWriter(fos, "8859_1"))) {
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for (int i = 0; i < 100; i++) {
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String number = new Integer(i).toString();
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for (int h = 0; h < 2 - number.length(); h++)
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awriter.write("0");
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awriter.write("" + i);
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for (int j = 0; j < (charsPerGroup - 2); j++)
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awriter.write("0");
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}
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awriter.flush();
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}
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}
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}
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}
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