/*

 * Copyright (c) 2001, 2017, 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 6253145

 * @summary Test FileChannel.transferTo with file positions up to 8GB

 * @run testng/timeout=300 TransferTo6GBFile

 */

import java.io.File;

import java.io.IOException;

import java.io.PrintStream;

import java.io.RandomAccessFile;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

import java.nio.channels.ServerSocketChannel;

import java.nio.channels.SocketChannel;

import java.util.concurrent.TimeUnit;

import org.testng.annotations.Test;

public class TransferTo6GBFile {

    private static PrintStream err = System.err;

    private static PrintStream out = System.out;

    // Test transferTo with file positions larger than 2 and 4GB

    @Test

    public void xferTest08() throws Exception { // for bug 6253145

        final long G = 1024L * 1024L * 1024L;

        // Create 6GB file

        File file = File.createTempFile("source", null);

        file.deleteOnExit();

        RandomAccessFile raf = new RandomAccessFile(file, "rw");

        FileChannel fc = raf.getChannel();

        out.println("  Writing large file...");

        long t0 = System.nanoTime();

        try {

            fc.write(ByteBuffer.wrap("0123456789012345".getBytes("UTF-8")), 6*G);

            long t1 = System.nanoTime();

            out.printf("  Wrote large file in %d ns (%d ms) %n",

            t1 - t0, TimeUnit.NANOSECONDS.toMillis(t1 - t0));

        } catch (IOException x) {

            err.println("  Unable to create test file:" + x);

            fc.close();

            return;

        }

        // Setup looback connection and echo server

        ServerSocketChannel ssc = ServerSocketChannel.open();

        ssc.socket().bind(new InetSocketAddress(0));

        InetAddress lh = InetAddress.getLocalHost();

        InetSocketAddress isa = new InetSocketAddress(lh, ssc.socket().getLocalPort());

        SocketChannel source = SocketChannel.open(isa);

        SocketChannel sink = ssc.accept();

        Thread thr = new Thread(new EchoServer(sink));

        thr.start();

        // Test data is array of positions and counts

        long testdata[][] = {

            { 2*G-1,    1 },

            { 2*G-1,    10 },       // across 2GB boundary

            { 2*G,      1 },

            { 2*G,      10 },

            { 2*G+1,    1 },

            { 4*G-1,    1 },

            { 4*G-1,    10 },       // across 4GB boundary

            { 4*G,      1 },

            { 4*G,      10 },

            { 4*G+1,    1 },

            { 5*G-1,    1 },

            { 5*G-1,    10 },

            { 5*G,      1 },

            { 5*G,      10 },

            { 5*G+1,    1 },

            { 6*G,      1 },

        };

        ByteBuffer sendbuf = ByteBuffer.allocateDirect(100);

        ByteBuffer readbuf = ByteBuffer.allocateDirect(100);

        try {

            byte value = 0;

            for (int i=0; i<testdata.length; i++) {

                long position = testdata[(int)i][0];

                long count = testdata[(int)i][1];

                // generate bytes

                for (long j=0; j<count; j++) {

                    sendbuf.put(++value);

                }

                sendbuf.flip();

                // write to file and transfer to echo server

                fc.write(sendbuf, position);

                t0 = System.nanoTime();

                fc.transferTo(position, count, source);

                out.printf("  transferTo(%d, %2d, source): %d ns%n",

                    position, count, System.nanoTime() - t0);

                // read from echo server

                long nread = 0;

                while (nread < count) {

                    int n = source.read(readbuf);

                    if (n < 0)

                        throw new RuntimeException("Premature EOF!");

                    nread += n;

                }

                // check reply from echo server

                readbuf.flip();

                sendbuf.flip();

                if (!readbuf.equals(sendbuf))

                    throw new RuntimeException("Echoed bytes do not match!");

                readbuf.clear();

                sendbuf.clear();

            }

        } finally {

            source.close();

            ssc.close();

            fc.close();

            file.delete();

        }

    }

    /**

     * Simple in-process server to echo bytes read by a given socket channel

     */

    static class EchoServer implements Runnable {

        private SocketChannel sc;

        public EchoServer(SocketChannel sc) {

            this.sc = sc;

        }

        public void run() {

            ByteBuffer bb = ByteBuffer.allocateDirect(1024);

            try {

                for (;;) {

                    int n = sc.read(bb);

                    if (n < 0)

                        break;

                    bb.flip();

                    while (bb.remaining() > 0) {

                        sc.write(bb);

                    }

                    bb.clear();

                }

            } catch (IOException x) {

                x.printStackTrace();

            } finally {

                try {

                    sc.close();

                } catch (IOException ignore) { }

            }

        }

    }

}