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/*
* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @bug 8164900
* @summary Test positional write method of FileChannel with DirectIO
* (use -Dseed=X to set PRNG seed)
* @library .. /test/lib
* @build jdk.test.lib.RandomFactory
* DirectIOTest
* @run main/othervm PwriteDirect
* @key randomness
*/
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.*;
import java.nio.file.Files;
import java.nio.file.FileStore;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.Random;
import com.sun.nio.file.ExtendedOpenOption;
import jdk.test.lib.RandomFactory;
/**
* Testing FileChannel's positional write method.
*/
public class PwriteDirect {
private static Random generator = RandomFactory.getRandom();
private static int charsPerGroup = -1;
private static int alignment = -1;
private static boolean initTests() throws Exception {
Path p = DirectIOTest.createTempFile();
if (!DirectIOTest.isDirectIOSupportedByFS(p)) {
Files.delete(p);
return false;
}
try {
FileStore fs = Files.getFileStore(p);
alignment = (int)fs.getBlockSize();
charsPerGroup = alignment;
} finally {
Files.delete(p);
}
return true;
}
public static void main(String[] args) throws Exception {
if (initTests()) {
genericTest();
TestWithNotAlignedChannelPosition();
testUnwritableChannel();
}
}
private static void testUnwritableChannel() throws Exception {
Path p = DirectIOTest.createTempFile();
try (FileChannel fc = FileChannel.open(p,
StandardOpenOption.DELETE_ON_CLOSE, ExtendedOpenOption.DIRECT)) {
try {
fc.write(ByteBuffer.allocate(charsPerGroup), 0);
throw new RuntimeException("Expected exception not thrown");
} catch(NonWritableChannelException e) {
// Correct result
}
}
}
private static void TestWithNotAlignedChannelPosition() throws Exception {
Path p = DirectIOTest.createTempFile();
try (FileChannel fc = FileChannel.open(p,
StandardOpenOption.WRITE, StandardOpenOption.DELETE_ON_CLOSE, ExtendedOpenOption.DIRECT)) {
int bufferSize = charsPerGroup;
long position = charsPerGroup - 1;
try {
fc.write(ByteBuffer.allocate(bufferSize), position);
throw new RuntimeException("Expected exception not thrown");
} catch(IOException e) {
if (!e.getMessage().contains("Channel position (" + position + ")"
+ " is not a multiple of the block size (" + alignment + ")"))
throw new RuntimeException("Write test failed");
}
}
}
private static void genericTest() throws Exception {
Path p = DirectIOTest.createTempFile();
initTestFile(p);
try (FileChannel fc = FileChannel.open(p,
StandardOpenOption.READ, StandardOpenOption.WRITE,
StandardOpenOption.DELETE_ON_CLOSE, ExtendedOpenOption.DIRECT)) {
ByteBuffer block =
ByteBuffer.allocateDirect(charsPerGroup + alignment - 1)
.alignedSlice(alignment);
for (int x = 0; x < 100; x++) {
block.clear();
long offset = generator.nextInt(100) * charsPerGroup;
// Write known sequence out
for (int i = 0; i < charsPerGroup; i++) {
block.put(i, (byte)'a');
}
long originalPosition = fc.position();
int written = fc.write(block, offset);
if (written < 0)
throw new Exception("Write failed");
long newPosition = fc.position();
// Ensure that file pointer position has not changed
if (originalPosition != newPosition)
throw new Exception("File position modified");
// Attempt to read sequence back in
originalPosition = fc.position();
block.rewind();
int read = fc.read(block, offset);
if (read != charsPerGroup)
throw new Exception("Read failed");
newPosition = fc.position();
// Ensure that file pointer position has not changed
if (originalPosition != newPosition)
throw new Exception("File position modified");
for (int j = 0; j < charsPerGroup; j++) {
if (block.get(j) != (byte)'a')
throw new Exception("Write test failed");
}
}
}
}
private static void initTestFile(Path p) throws Exception {
try (OutputStream fos = Files.newOutputStream(p)) {
try (BufferedWriter awriter
= new BufferedWriter(new OutputStreamWriter(fos, "8859_1"))) {
for (int i = 0; i < 100; i++) {
String number = new Integer(i).toString();
for (int h = 0; h < 4 - number.length(); h++)
awriter.write("0");
awriter.write("" + i);
for (int j = 0; j < 4092; j++)
awriter.write("0");
}
awriter.flush();
}
}
}
}
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