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