/*

 * Copyright (c) 2008, 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.

 *

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 */

/* @test

 * @bug 4607272 6842687

 * @summary Unit test for AsynchronousServerSocketChannel

 * @modules jdk.net

 * @run main/timeout=180 Basic

 */

import java.nio.channels.*;

import java.net.*;

import static java.net.StandardSocketOptions.*;

import java.io.IOException;

import java.util.List;

import java.util.Set;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.Future;

import java.util.concurrent.atomic.AtomicReference;

import static jdk.net.ExtendedSocketOptions.TCP_KEEPCOUNT;

import static jdk.net.ExtendedSocketOptions.TCP_KEEPIDLE;

import static jdk.net.ExtendedSocketOptions.TCP_KEEPINTERVAL;

public class Basic {

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

        testBind();

        testAccept();

        testSocketOptions();

    }

    static void testBind() throws Exception {

        System.out.println("-- bind --");

        AsynchronousServerSocketChannel ch = AsynchronousServerSocketChannel.open();

        if (ch.getLocalAddress() != null)

            throw new RuntimeException("Local address should be 'null'");

        ch.bind(new InetSocketAddress(0), 20);

        // check local address after binding

        InetSocketAddress local = (InetSocketAddress)ch.getLocalAddress();

        if (local.getPort() == 0)

            throw new RuntimeException("Unexpected port");

        if (!local.getAddress().isAnyLocalAddress())

            throw new RuntimeException("Not bound to a wildcard address");

        // try to re-bind

        try {

            ch.bind(new InetSocketAddress(0));

            throw new RuntimeException("AlreadyBoundException expected");

        } catch (AlreadyBoundException x) {

        }

        ch.close();

        // check ClosedChannelException

        ch = AsynchronousServerSocketChannel.open();

        ch.close();

        try {

            ch.bind(new InetSocketAddress(0));

            throw new RuntimeException("ClosedChannelException  expected");

        } catch (ClosedChannelException  x) {

        }

    }

    static void testAccept() throws Exception {

        System.out.println("-- accept --");

        final AsynchronousServerSocketChannel listener =

            AsynchronousServerSocketChannel.open().bind(new InetSocketAddress(0));

        InetAddress lh = InetAddress.getLocalHost();

        int port = ((InetSocketAddress)(listener.getLocalAddress())).getPort();

        final InetSocketAddress isa = new InetSocketAddress(lh, port);

        // establish a few loopback connections

        for (int i=0; i<100; i++) {

            SocketChannel sc = SocketChannel.open(isa);

            AsynchronousSocketChannel ch = listener.accept().get();

            sc.close();

            ch.close();

        }

       final AtomicReference<Throwable> exception = new AtomicReference<Throwable>();

        // start accepting

        listener.accept((Void)null, new CompletionHandler<AsynchronousSocketChannel,Void>() {

            public void completed(AsynchronousSocketChannel ch, Void att) {

                try {

                    ch.close();

                } catch (IOException ignore) { }

            }

            public void failed(Throwable exc, Void att) {

                exception.set(exc);

            }

        });

        // check AcceptPendingException

        try {

            listener.accept();

            throw new RuntimeException("AcceptPendingException expected");

        } catch (AcceptPendingException x) {

        }

        // asynchronous close

        listener.close();

        while (exception.get() == null)

            Thread.sleep(100);

        if (!(exception.get() instanceof AsynchronousCloseException))

            throw new RuntimeException("AsynchronousCloseException expected");

        // once closed when a further attemt should throw ClosedChannelException

        try {

            listener.accept().get();

            throw new RuntimeException("ExecutionException expected");

        } catch (ExecutionException x) {

            if (!(x.getCause() instanceof ClosedChannelException))

                throw new RuntimeException("Cause of ClosedChannelException expected");

        } catch (InterruptedException x) {

        }

    }

    static void testSocketOptions() throws Exception {

        System.out.println("-- socket options --");

        AsynchronousServerSocketChannel ch = AsynchronousServerSocketChannel.open();

        try {

            // check supported options

            Set<SocketOption<?>> options = ch.supportedOptions();

            boolean reuseport = options.contains(SO_REUSEPORT);

            if (!options.contains(SO_REUSEADDR))

                throw new RuntimeException("SO_REUSEADDR should be supported");

            if (!options.contains(SO_REUSEPORT) && reuseport)

                throw new RuntimeException("SO_REUSEPORT should be supported");

            if (!options.contains(SO_RCVBUF))

                throw new RuntimeException("SO_RCVBUF should be supported");

            // allowed to change when not bound

            ch.setOption(SO_RCVBUF, 256*1024);     // can't check

            int before = ch.getOption(SO_RCVBUF);

            int after = ch.setOption(SO_RCVBUF, Integer.MAX_VALUE).getOption(SO_RCVBUF);

            if (after < before)

                 throw new RuntimeException("setOption caused SO_RCVBUF to decrease");

            ch.setOption(SO_REUSEADDR, true);

            checkOption(ch, SO_REUSEADDR, true);

            ch.setOption(SO_REUSEADDR, false);

            checkOption(ch, SO_REUSEADDR, false);

            if (reuseport) {

                ch.setOption(SO_REUSEPORT, true);

                checkOption(ch, SO_REUSEPORT, true);

                ch.setOption(SO_REUSEPORT, false);

                checkOption(ch, SO_REUSEPORT, false);

            }

            List<? extends SocketOption> extOptions = List.of(TCP_KEEPCOUNT,

                    TCP_KEEPIDLE, TCP_KEEPINTERVAL);

            if (options.containsAll(extOptions)) {

                ch.setOption(TCP_KEEPIDLE, 1234);

                checkOption(ch, TCP_KEEPIDLE, 1234);

                ch.setOption(TCP_KEEPINTERVAL, 123);

                checkOption(ch, TCP_KEEPINTERVAL, 123);

                ch.setOption(TCP_KEEPCOUNT, 7);

                checkOption(ch, TCP_KEEPCOUNT, 7);

            }

        } finally {

            ch.close();

        }

    }

    static void checkOption(AsynchronousServerSocketChannel ch,

                            SocketOption name, Object expectedValue)

        throws IOException

    {

        Object value = ch.getOption(name);

        if (!value.equals(expectedValue))

            throw new RuntimeException("value not as expected");

    }

}