| /* |
| * Copyright (c) 2010, 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 6913877 |
| * @summary Stress AsynchronousFileChannel.write |
| * @key randomness |
| */ |
| |
| import java.io.*; |
| import java.nio.ByteBuffer; |
| import static java.nio.file.StandardOpenOption.*; |
| import java.nio.channels.*; |
| import java.util.Random; |
| import java.util.concurrent.CountDownLatch; |
| |
| public class LotsOfWrites { |
| static final Random rand = new Random(); |
| |
| /** |
| * Asynchronously writes a known pattern to a file up to a given size, |
| * counting down a latch to release waiters when done. |
| */ |
| static class Writer implements CompletionHandler<Integer,ByteBuffer> { |
| private final File file; |
| private final long size; |
| private final CountDownLatch latch; |
| private final AsynchronousFileChannel channel; |
| |
| private volatile long position; |
| private volatile byte nextByte; |
| |
| private long updatePosition(long nwrote) { |
| position += nwrote; |
| return position; |
| } |
| |
| private ByteBuffer genNextBuffer() { |
| int n = Math.min(8192 + rand.nextInt(8192), (int)(size - position)); |
| ByteBuffer buf = ByteBuffer.allocate(n); |
| for (int i=0; i<n; i++) { |
| buf.put(nextByte++); |
| } |
| buf.flip(); |
| return buf; |
| } |
| |
| // close channel and release any waiters |
| private void done() { |
| try { |
| channel.close(); |
| } catch (IOException ignore) { } |
| latch.countDown(); |
| } |
| |
| Writer(File file, long size, CountDownLatch latch) throws IOException { |
| this.file = file; |
| this.size = size; |
| this.latch = latch; |
| this.channel = AsynchronousFileChannel.open(file.toPath(), WRITE); |
| } |
| |
| File file() { |
| return file; |
| } |
| |
| long size() { |
| return size; |
| } |
| |
| // initiate first write |
| void start() { |
| ByteBuffer buf = genNextBuffer(); |
| channel.write(buf, 0L, buf, this); |
| } |
| |
| @Override |
| public void completed(Integer nwrote, ByteBuffer buf) { |
| long pos = updatePosition(nwrote); |
| if (!buf.hasRemaining()) { |
| // buffer has been completely written; decide if we need to |
| // write more |
| if (position >= size) { |
| done(); |
| return; |
| } |
| buf = genNextBuffer(); |
| } |
| channel.write(buf, pos, buf, this); |
| } |
| |
| @Override |
| public void failed(Throwable exc, ByteBuffer buf) { |
| exc.printStackTrace(); |
| done(); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| // random number of writers |
| int count = 20 + rand.nextInt(16); |
| Writer[] writers = new Writer[count]; |
| CountDownLatch latch = new CountDownLatch(count); |
| |
| // initiate writing to each file |
| for (int i=0; i<count; i++) { |
| long size = 512*1024 + rand.nextInt(512*1024); |
| File blah = File.createTempFile("blah", null); |
| blah.deleteOnExit(); |
| Writer writer = new Writer(blah, size, latch); |
| writers[i] = writer; |
| writer.start(); |
| } |
| |
| // wait for writing to complete |
| latch.await(); |
| |
| // verify content of each file |
| boolean failed = false; |
| byte[] buf = new byte[8192]; |
| for (int i=0; i<count ;i++) { |
| Writer writer = writers[i]; |
| FileInputStream in = new FileInputStream(writer.file()); |
| try { |
| long size = 0L; |
| byte expected = 0; |
| int nread = in.read(buf); |
| while (nread > 0) { |
| for (int j=0; j<nread; j++) { |
| if (buf[j] != expected) { |
| System.err.println("Unexpected contents"); |
| failed = true; |
| break; |
| } |
| expected++; |
| } |
| if (failed) |
| break; |
| size += nread; |
| nread = in.read(buf); |
| } |
| if (!failed && size != writer.size()) { |
| System.err.println("Unexpected size"); |
| failed = true; |
| } |
| if (failed) |
| break; |
| } finally { |
| in.close(); |
| } |
| } |
| |
| // clean-up |
| for (int i=0; i<count; i++) { |
| writers[i].file().delete(); |
| } |
| |
| if (failed) |
| throw new RuntimeException("Test failed"); |
| } |
| } |