85 lines
2.8 KiB
Java
85 lines
2.8 KiB
Java
/*
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* Copyright (c) 2008, 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 6448457
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* @summary Test Channels.newOutputStream returns OutputStream that handles
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* short writes from the underlying channel
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* @key randomness
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*/
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import java.io.OutputStream;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.channels.*;
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import java.util.Random;
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public class ShortWrite {
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static Random rand = new Random();
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static int bytesWritten = 0;
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public static void main(String[] args) throws IOException {
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WritableByteChannel wbc = new WritableByteChannel() {
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public int write(ByteBuffer src) {
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int rem = src.remaining();
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if (rem > 0) {
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// short write
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int n = rand.nextInt(rem) + 1;
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src.position(src.position() + n);
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bytesWritten += n;
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return n;
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} else {
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return 0;
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}
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}
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public void close() throws IOException {
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throw new RuntimeException("not implemented");
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}
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public boolean isOpen() {
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throw new RuntimeException("not implemented");
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}
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};
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// wrap Channel with OutputStream
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OutputStream out = Channels.newOutputStream(wbc);
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// write 100, 99, 98, ... 1
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// and check that the expected number of bytes is written
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int expected = 0;
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byte[] buf = new byte[100];
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for (int i=0; i<buf.length; i++) {
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int len = buf.length-i;
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out.write(buf, i, len);
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expected += len;
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}
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System.out.format("Bytes written: %d, expected: %d\n", bytesWritten,
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expected);
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if (bytesWritten != expected)
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throw new RuntimeException("incorrect number of bytes written");
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}
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}
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