/*

 * Copyright (c) 2012, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8003833

 * @summary Spurious NPE from Socket.getIn/OutputStream

 */

import java.io.IOException;

import java.lang.reflect.Constructor;

import java.net.ServerSocket;

import java.net.Socket;

import java.util.concurrent.Phaser;

// Racey test, will not always fail, but if it does then there is a problem.

public class Streams {

    static final int NUM_THREADS = 100;

    static volatile boolean failed;

    static final Phaser startingGate = new Phaser(NUM_THREADS + 1);

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

        try (ServerSocket ss = new ServerSocket(0)) {

            runTest(OutputStreamGetter.class, ss);

            runTest(InputStreamGetter.class, ss);

        }

        if (failed)

            throw new RuntimeException("Failed, check output");

    }

    static void runTest(Class<? extends StreamGetter> klass, ServerSocket ss)

        throws Exception

    {

        final int port = ss.getLocalPort();

        Socket[] sockets = new Socket[NUM_THREADS];

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

            sockets[i] = new Socket("localhost", port);

            try (Socket socket = ss.accept()) {}

        }

        Constructor<? extends StreamGetter> ctr = klass.getConstructor(Socket.class);

        Thread[] threads = new Thread[NUM_THREADS];

        for (int i=0; i<NUM_THREADS; i++)

            threads[i] = ctr.newInstance(sockets[i]);

        for (int i=0; i<NUM_THREADS; i++)

            threads[i].start();

        startingGate.arriveAndAwaitAdvance();

        for (int i=0; i<NUM_THREADS; i++)

            sockets[i].close();

        for (int i=0; i<NUM_THREADS; i++)

            threads[i].join();

    }

    static abstract class StreamGetter extends Thread {

        final Socket socket;

        StreamGetter(Socket s) { socket = s; }

        @Override

        public void run() {

            try {

                startingGate.arriveAndAwaitAdvance();

                getStream();

            } catch (IOException x) {

                // OK, socket may be closed

            } catch (NullPointerException x) {

                x.printStackTrace();

                failed = true;

            }

        }

        abstract void getStream() throws IOException;

    }

    static class InputStreamGetter extends StreamGetter {

        public InputStreamGetter(Socket s) { super(s); }

        void getStream() throws IOException {

            socket.getInputStream();

        }

    }

    static class OutputStreamGetter extends StreamGetter {

        public OutputStreamGetter(Socket s) { super(s); }

        void getStream() throws IOException {

            socket.getOutputStream();

        }

    }

}