/*

 * Copyright (c) 2014 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

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 */

package org.openjdk.bench.java.net;

import java.io.IOException;

import java.net.StandardProtocolFamily;

import java.nio.channels.UnixDomainSocketAddress;

import java.nio.ByteBuffer;

import java.nio.channels.ClosedChannelException;

import java.nio.channels.ServerSocketChannel;

import java.nio.channels.SocketChannel;

import java.nio.file.*;

import java.util.concurrent.TimeUnit;

import java.util.concurrent.atomic.AtomicInteger;

import org.openjdk.jmh.annotations.*;

/**

 * Tests the overheads of I/O API.

 * This test is known to depend heavily on network conditions and paltform.

 */

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.MILLISECONDS)

@State(Scope.Thread)

public class UnixSocketChannelReadWrite {

    private ServerSocketChannel ssc;

    private SocketChannel s1, s2;

    private ReadThread rt;

    private ByteBuffer bb = ByteBuffer.allocate(1);

    private static volatile String tempDir;

    private static final AtomicInteger count = new AtomicInteger(0);

    private volatile Path socket;

    static {

        try {

            Path p = Files.createTempDirectory("readWriteTest");

            tempDir = p.toString();

        } catch (IOException e) {

            tempDir = null;

        }

    }

    private ServerSocketChannel getServerSocketChannel() throws IOException {

        int next = count.incrementAndGet();

        socket = Paths.get(tempDir, Integer.toString(next));

        UnixDomainSocketAddress addr = new UnixDomainSocketAddress(socket);

        ServerSocketChannel c = ServerSocketChannel.open(StandardProtocolFamily.UNIX);

        c.bind(addr);

        return c;

    }

    @Setup(Level.Trial)

    public void beforeRun() throws IOException {

        ssc = getServerSocketChannel();

        s1 = SocketChannel.open(ssc.getLocalAddress());

        s2 = ssc.accept();

        rt = new ReadThread(s2);

        rt.start();

        bb.put((byte) 47);

        bb.flip();

    }

    @TearDown(Level.Trial)

    public void afterRun() throws IOException, InterruptedException {

        s1.close();

        s2.close();

        ssc.close();

        Files.delete(socket);

        Files.delete(Path.of(tempDir));

        rt.join();

    }

    @Benchmark

    public void test() throws IOException {

        s1.write(bb);

        bb.flip();

    }

    static class ReadThread extends Thread {

        private SocketChannel sc;

        public ReadThread(SocketChannel s2) {

            this.sc = s2;

        }

        public void run() {

            try {

                ByteBuffer bb = ByteBuffer.allocate(1);

                while (sc.read(bb) > 0) {

                    bb.flip();

                }

            } catch (ClosedChannelException ex) {

                // shutdown time

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

    }

}