/*

 * Copyright (c) 2018, 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 8195160

 * @summary Test RdmaSelector with RdmaServerSocketChannels

 * @requires (os.family == "linux")

 * @library .. /test/lib /test/jdk/java/nio/channels 

 * @build RsocketTest

 * @run main/othervm BasicAccept

 */

import java.io.IOException;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.net.StandardProtocolFamily;

import java.nio.ByteBuffer;

import java.nio.channels.SelectionKey;

import java.nio.channels.Selector;

import java.nio.channels.ServerSocketChannel;

import java.nio.channels.SocketChannel;

import java.nio.channels.spi.SelectorProvider;

import java.util.Iterator;

import java.util.Set;

import jdk.net.RdmaSockets;

import jtreg.SkippedException;

public class BasicAccept {

    static void server(ServerSocketChannel ssc) throws Exception {

        Selector acceptSelector = RdmaSockets.openSelector();

        try {

            ssc.configureBlocking(false);

            SelectionKey acceptKey

                = ssc.register(acceptSelector, SelectionKey.OP_ACCEPT);

            for (;;) {

                int n = acceptSelector.select();

                if (Thread.interrupted())

                    break;

                if (n == 0)

                    continue;

                Set<SelectionKey> readyKeys = acceptSelector.selectedKeys();

                Iterator<SelectionKey> i = readyKeys.iterator();

                while (i.hasNext()) {

                    SelectionKey sk = i.next();

                    i.remove();

                    ServerSocketChannel nextReady

                        = (ServerSocketChannel)sk.channel();

                    SocketChannel sc = nextReady.accept();

                    ByteBuffer bb = ByteBuffer.wrap(new byte[] { 42 });

                    sc.write(bb);

                    sc.close();

                }

            }

        } finally {

            acceptSelector.close();

        }

    }

    private static class Server extends TestThread {

        final ServerSocketChannel ssc;

        Server() throws IOException {

            super("Server", System.err);

            this.ssc = RdmaSockets.openServerSocketChannel(

                StandardProtocolFamily.INET)

                .bind(new InetSocketAddress(InetAddress.getLocalHost(), 0));

        }

        int port() {

            return ssc.socket().getLocalPort();

        }

        void go() throws Exception {

            try {

                server(ssc);

            } finally {

                ssc.close();

            }

        }

    }

    static void client(int port) throws Exception {

        // Get a connection from the server

        InetAddress lh = InetAddress.getLocalHost();

        InetSocketAddress isa

            = new InetSocketAddress(lh, port);

        int connectFailures = 0;

        boolean result = false;

        SocketChannel sc = RdmaSockets.openSocketChannel(

            StandardProtocolFamily.INET);

        for (;;) {

            try {

                result = sc.connect(isa);

                break;

            } catch (java.net.ConnectException e) {

                connectFailures++;

                if (connectFailures > 30)

                    throw new RuntimeException("Cannot connect");

                Thread.currentThread().sleep(100);

                sc = RdmaSockets.openSocketChannel(StandardProtocolFamily.INET);

            }

        }

        if (result) {

            System.err.println("Connected");

        } else {

            // Only happens when server and client are on separate machines

            System.err.println("Connection pending...");

            connectFailures = 0;

            while (!result) {

                try {

                    result = sc.finishConnect();

                    if (!result)

                        System.err.println("Not finished");

                    Thread.sleep(50);

                } catch (java.net.ConnectException e) {

                    Thread.sleep(100);

                    connectFailures++;

                    if (connectFailures > 30)

                        throw new RuntimeException("Cannot finish connecting");

                }

            }

            System.err.println("Finished connecting");

        }

        ByteBuffer bb = ByteBuffer.allocateDirect(1024);

        if (sc.read(bb) < 0)

            throw new RuntimeException("Failed to read from server");

        if (bb.get(0) != 42)

            throw new RuntimeException("Read wrong byte from server");

        System.err.println("Read from server");

        sc.close();

    }

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

        if (!RsocketTest.isRsocketAvailable())

            throw new SkippedException("rsocket is not available");

        Server server = new Server();

        server.start();

        try {

            client(server.port());

        } finally {

            server.interrupt();

            server.finish(2000);

        }

    }

}