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 * published by the Free Software Foundation.

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 * 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

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 * 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,

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/* @test

 * @bug 4777504

 * @summary Ensure that a Selector can return at least 100 selected keys

 * @author Mark Reinhold

 * @library ..

 * @build SelectorLimit

 * @run main/othervm SelectorLimit

 */

import java.io.*;

import java.net.*;

import java.nio.*;

import java.nio.channels.*;

import java.util.*;

public class SelectorLimit {

    static PrintStream log = System.err;

    static class Listener

        extends TestThread

    {

        volatile int count = 0;

        private ServerSocketChannel ssc;

        Listener(ServerSocketChannel ssc) {

            super("Listener");

            this.ssc = ssc;

        }

        void go() throws IOException {

            for (;;) {

                ssc.accept();

                count++;

            }

        }

    }

    static final int N_KEYS = 500;

    static final int MIN_KEYS = 100;

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

        // win9X can't handle many connections at once

        String osName = System.getProperty("os.name");

        if (osName.toLowerCase().startsWith("win")) {

            if (!(osName.equals("Windows NT")

                  || osName.equals("Windows 2000")

                  || osName.equals("Windows XP")))

                return;

        }

        ServerSocketChannel ssc = ServerSocketChannel.open();

        TestUtil.bind(ssc);

        Listener lth = new Listener(ssc);

        lth.start();

        Selector sel = Selector.open();

        SocketChannel[] sca = new SocketChannel[N_KEYS];

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

            SocketChannel sc = SocketChannel.open();

            sc.configureBlocking(false);

            sc.register(sel, SelectionKey.OP_CONNECT | SelectionKey.OP_WRITE);

            sc.connect(ssc.socket().getLocalSocketAddress());

        }

        for (int i = 0; i < 10; i++) {

            if (lth.count >= MIN_KEYS)

                break;

            Thread.sleep(1000);

        }

        log.println(lth.count + " connections accepted");

        Thread.sleep(500);

        int n = sel.select();

        log.println(n + " keys selected");

        if (n < MIN_KEYS)

            throw new Exception("Only selected " + n + " keys");

    }

}