/*

 * Copyright (c) 2001, 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 4526754

 * @summary Test Pipe scattering reads

 * @key randomness

 */

import java.nio.channels.*;

import java.nio.*;

import java.util.Random;

public class ScatteringRead {

    private static Random generator = new Random();

    public static void main(String[] args) throws Exception {

        scScatter();

    }

    private static void scScatter() throws Exception {

        Pipe p = Pipe.open();

        Pipe.SinkChannel sink = p.sink();

        Pipe.SourceChannel source = p.source();

        sink.configureBlocking(false);

        ByteBuffer outgoingdata = ByteBuffer.allocateDirect(30);

        byte[] someBytes = new byte[30];

        generator.nextBytes(someBytes);

        outgoingdata.put(someBytes);

        outgoingdata.flip();

        int totalWritten = 0;

        while (totalWritten < 30) {

            int written = sink.write(outgoingdata);

            if (written < 0)

                throw new Exception("Write failed");

            totalWritten += written;

        }

        ByteBuffer[] bufs = new ByteBuffer[3];

        for(int i=0; i<3; i++)

            bufs[i] = ByteBuffer.allocateDirect(10);

        long numBytesRead = source.read(bufs);

        if (numBytesRead < 30)

            throw new Exception("Pipe test failed");

        sink.close();

        source.close();

    }

}