| /* |
| * Copyright (c) 2008, 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 6448457 |
| * @summary Test Channels.newOutputStream returns OutputStream that handles |
| * short writes from the underlying channel |
| * @key randomness |
| */ |
| |
| 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"); |
| |
| } |
| } |