/*

 * Copyright 2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/* @test

 * @bug 4617165

 * @summary Ensure that socket hangups are handled correctly

 * @library ..

 * @build TestUtil

 * @run main Hangup

 */

import java.io.*;

import java.net.*;

import java.nio.*;

import java.nio.channels.*;

import java.util.*;

public class Hangup {

    static PrintStream log = System.err;

    static int failures = 0;

    private static class Failure

        extends RuntimeException

    {

        Failure(String s) {

            super(s);

        }

    }

    static void doSelect(Selector sel, SelectionKey sk, int count)

        throws IOException

    {

        int n = sel.select();

        if (n != 1)

            throw new Failure("Select returned zero");

        Set sks = sel.selectedKeys();

        if (sks.size() != 1)

            throw new Failure("Wrong size for selected-key set: "

                              + sks.size());

        if (!sks.remove(sk))

            throw new Failure("Key not in selected-key set");

        log.println("S: Socket selected #" + count);

    }

    static void dally() {

        try {

            Thread.sleep(100);

        } catch (InterruptedException x) { }

    }

    static void test(boolean writeFromClient, boolean readAfterClose)

        throws IOException

    {

        ServerSocketChannel ssc = null;

        SocketChannel cl = null;        // client end

        SocketChannel sv = null;        // server end

        Selector sel = null;

        log.println();

        log.println("Test: writeFromClient = " + writeFromClient

                    + ", readAfterClose = " + readAfterClose);

        try {

            int ns = 0;                 // Number of selection operations done

            // Set up server socket

            ssc = ServerSocketChannel.open();

            SocketAddress sa = TestUtil.bindToRandomPort(ssc);

            log.println("S: Listening on port "

                        + ssc.socket().getLocalPort());

            // Connect client

            cl = SocketChannel.open(sa);

            log.println("C: Connected via port "

                        + cl.socket().getLocalPort());

            // Accept client connection

            sv = ssc.accept();

            log.println("S: Client connection accepted");

            // Create selector and register server side

            sel = Selector.open();

            sv.configureBlocking(false);

            SelectionKey sk = sv.register(sel, SelectionKey.OP_READ);

            ByteBuffer stuff = ByteBuffer.allocate(10);

            int n;

            if (writeFromClient) {

                // Write from client, read from server

                stuff.clear();

                if (cl.write(stuff) != stuff.capacity())

                    throw new Failure("Incorrect number of bytes written");

                log.println("C: Wrote stuff");

                dally();

                doSelect(sel, sk, ++ns);

                stuff.clear();

                if (sv.read(stuff) != stuff.capacity())

                    throw new Failure("Wrong number of bytes read");

                log.println("S: Read stuff");

            }

            // Close client side

            cl.close();

            log.println("C: Socket closed");

            dally();

            // Select again

            doSelect(sel, sk, ++ns);

            if (readAfterClose) {

                // Read from client after client has disconnected

                stuff.clear();

                if (sv.read(stuff) != -1)

                    throw new Failure("Wrong number of bytes read");

                log.println("S: Read EOF");

            }

            // Select a couple more times just to make sure we're doing

            // the right thing

            doSelect(sel, sk, ++ns);

            doSelect(sel, sk, ++ns);

        } finally {

            if (ssc != null)

                ssc.close();

            if (cl != null)

                cl.close();

            if (sv != null)

                sv.close();

            if (sel != null)

                sel.close();

        }

    }

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

        for (boolean writeFromClient = false;; writeFromClient = true) {

            for (boolean readAfterClose = false;; readAfterClose = true) {

                try {

                    test(writeFromClient, readAfterClose);

                } catch (Failure x) {

                    x.printStackTrace(log);

                    failures++;

                }

                if (readAfterClose)

                    break;

            }

            if (writeFromClient)

                break;

        }

        if (failures > 0) {

            log.println();

            throw new RuntimeException("Some tests failed");

        }

    }

}