c580cfee80
Reviewed-by: khazra, chegar
137 lines
4.4 KiB
Java
137 lines
4.4 KiB
Java
/*
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* Copyright (c) 2012, 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 7176630
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* @summary Check for short writes on SocketChannels configured in blocking mode
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*/
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import java.net.*;
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import java.nio.ByteBuffer;
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import java.nio.channels.*;
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import java.util.concurrent.*;
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import java.util.Random;
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import java.util.zip.CRC32;
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public class ShortWrite {
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static final Random rand = new Random();
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/**
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* Returns a checksum on the remaining bytes in the given buffer.
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*/
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static long computeChecksum(ByteBuffer bb) {
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CRC32 crc32 = new CRC32();
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crc32.update(bb);
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return crc32.getValue();
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}
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/**
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* A task that reads the expected number of bytes and returns the CRC32
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* of those bytes.
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*/
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static class Reader implements Callable<Long> {
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final SocketChannel sc;
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final ByteBuffer buf;
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Reader(SocketChannel sc, int expectedSize) {
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this.sc = sc;
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this.buf = ByteBuffer.allocate(expectedSize);
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}
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public Long call() throws Exception {
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while (buf.hasRemaining()) {
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int n = sc.read(buf);
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if (n == -1)
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throw new RuntimeException("Premature EOF encountered");
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}
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buf.flip();
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return computeChecksum(buf);
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}
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}
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/**
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* Run test with a write of the given number of bytes.
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*/
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static void test(ExecutorService pool,
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SocketChannel source,
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SocketChannel sink,
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int size)
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throws Exception
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{
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System.out.println(size);
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// random bytes in the buffer
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ByteBuffer buf = ByteBuffer.allocate(size);
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rand.nextBytes(buf.array());
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// submit task to read the bytes
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Future<Long> result = pool.submit(new Reader(sink, size));
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// write the bytes
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int n = source.write(buf);
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if (n != size)
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throw new RuntimeException("Short write detected");
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// check the bytes that were received match
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buf.rewind();
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long expected = computeChecksum(buf);
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long actual = result.get();
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if (actual != expected)
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throw new RuntimeException("Checksum did not match");
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}
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public static void main(String[] args) throws Exception {
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ExecutorService pool = Executors.newSingleThreadExecutor();
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try {
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try (ServerSocketChannel ssc = ServerSocketChannel.open()) {
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ssc.bind(new InetSocketAddress(0));
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InetAddress lh = InetAddress.getLocalHost();
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int port = ssc.socket().getLocalPort();
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SocketAddress sa = new InetSocketAddress(lh, port);
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try (SocketChannel source = SocketChannel.open(sa);
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SocketChannel sink = ssc.accept())
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{
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// run tests on sizes around 128k as that is the problem
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// area on Windows.
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int BOUNDARY = 128 * 1024;
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for (int size=(BOUNDARY-2); size<=(BOUNDARY+2); size++) {
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test(pool, source, sink, size);
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}
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// run tests on random sizes
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for (int i=0; i<20; i++) {
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int size = rand.nextInt(1024*1024);
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test(pool, source, sink, size);
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}
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}
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}
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} finally {
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pool.shutdown();
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}
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}
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}
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