/*

 * Copyright (c) 2001, 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

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 */

/* @test

 * @bug 4513011

 * @summary Registering and cancelling same fd many times

 * @library .. /test/lib

 * @build jdk.test.lib.Utils TestServers

 * @run main Alias

 */

import java.net.*;

import java.nio.*;

import java.nio.channels.*;

import java.nio.channels.spi.SelectorProvider;

import java.util.*;

public class Alias {

    static int success = 0;

    static int LIMIT = 20; // Hangs after just 1 if problem is present

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

        try (TestServers.DayTimeServer daytimeServer

                = TestServers.DayTimeServer.startNewServer(100)) {

            test1(daytimeServer);

        }

    }

    static void test1(TestServers.DayTimeServer daytimeServer) throws Exception {

        Selector selector = SelectorProvider.provider().openSelector();

        InetAddress myAddress = daytimeServer.getAddress();

        InetSocketAddress isa

            = new InetSocketAddress(myAddress,

                                    daytimeServer.getPort());

        for (int j=0; j<LIMIT; j++) {

            SocketChannel sc = SocketChannel.open();

            sc.configureBlocking(false);

            boolean result = sc.connect(isa);

            // On some platforms - given that we're using a local server,

            // we may not enter into the if () { } statement below...

            if (!result) {

                SelectionKey key = sc.register(selector,

                                               SelectionKey.OP_CONNECT);

                while (!result) {

                    int keysAdded = selector.select(100);

                    if (keysAdded > 0) {

                        Set readyKeys = selector.selectedKeys();

                        Iterator i = readyKeys.iterator();

                        while (i.hasNext()) {

                            SelectionKey sk = (SelectionKey)i.next();

                            SocketChannel nextReady =

                                (SocketChannel)sk.channel();

                            result = nextReady.finishConnect();

                        }

                    }

                }

                key.cancel();

            }

            read(sc);

        }

        selector.close();

    }

    static void read(SocketChannel sc) throws Exception {

        ByteBuffer bb = ByteBuffer.allocateDirect(100);

        int n = 0;

        while (n == 0) // Note this is not a rigorous check for done reading

            n = sc.read(bb);

        //bb.position(bb.position() - 2);

        //bb.flip();

        //CharBuffer cb = Charset.forName("US-ASCII").newDecoder().decode(bb);

        //System.out.println("Received: \"" + cb + "\"");

        sc.close();

        success++;

    }

}