/*

 * Copyright (c) 2002, 2013, 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 4503092 8024883

 * @summary Tests that Windows Selector can use more than 63 channels

 * @run main LotsOfChannels

 * @run main/othervm -Dsun.nio.ch.maxUpdateArraySize=64 LotsOfChannels

 * @author kladko

 */

import java.net.*;

import java.io.*;

import java.nio.*;

import java.nio.channels.*;

public class LotsOfChannels {

    private final static int PIPES_COUNT = 256;

    private final static int BUF_SIZE = 8192;

    private final static int LOOPS = 10;

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

        Pipe[] pipes = new Pipe[PIPES_COUNT];

        Pipe pipe = Pipe.open();

        Pipe.SinkChannel sink = pipe.sink();

        Pipe.SourceChannel source = pipe.source();

        Selector sel = Selector.open();

        source.configureBlocking(false);

        source.register(sel, SelectionKey.OP_READ);

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

            pipes[i]= Pipe.open();

            Pipe.SourceChannel sc = pipes[i].source();

            sc.configureBlocking(false);

            sc.register(sel, SelectionKey.OP_READ);

            Pipe.SinkChannel sc2 = pipes[i].sink();

            sc2.configureBlocking(false);

            sc2.register(sel, SelectionKey.OP_WRITE);

        }

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

            sink.write(ByteBuffer.allocate(BUF_SIZE));

            int x = sel.selectNow();

            sel.selectedKeys().clear();

            source.read(ByteBuffer.allocate(BUF_SIZE));

        }

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

            pipes[i].sink().close();

            pipes[i].source().close();

        }

        pipe.sink().close();

        pipe.source().close();

        sel.close();

    }

}