/*

 * Copyright (c) 2009, 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 4927640

 * @summary Tests the SCTP protocol implementation

 * @author chegar

 */

import java.net.InetSocketAddress;

import java.net.SocketAddress;

import java.io.IOException;

import java.util.Set;

import java.util.Iterator;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.TimeUnit;

import java.nio.ByteBuffer;

import com.sun.nio.sctp.AbstractNotificationHandler;

import com.sun.nio.sctp.Association;

import com.sun.nio.sctp.AssociationChangeNotification;

import com.sun.nio.sctp.AssociationChangeNotification.AssocChangeEvent;

import com.sun.nio.sctp.HandlerResult;

import com.sun.nio.sctp.InvalidStreamException;

import com.sun.nio.sctp.MessageInfo;

import com.sun.nio.sctp.SctpChannel;

import com.sun.nio.sctp.SctpMultiChannel;

import com.sun.nio.sctp.ShutdownNotification;

import static java.lang.System.out;

import static java.lang.System.err;

public class Branch {

    /* Latches used to synchronize between the client and server so that

     * connections without any IO may not be closed without being accepted */

    final CountDownLatch clientFinishedLatch = new CountDownLatch(1);

    final CountDownLatch serverFinishedLatch = new CountDownLatch(1);

    void test(String[] args) {

        SocketAddress address = null;

        Server server = null;

        if (!Util.isSCTPSupported()) {

            out.println("SCTP protocol is not supported");

            out.println("Test cannot be run");

            return;

        }

        if (args.length == 2) {

            /* requested to connecct to a specific address */

            try {

                int port = Integer.valueOf(args[1]);

                address = new InetSocketAddress(args[0], port);

            } catch (NumberFormatException nfe) {

                err.println(nfe);

            }

        } else {

            /* start server on local machine, default */

            try {

                server = new Server();

                server.start();

                address = server.address();

                debug("Server started and listening on " + address);

            } catch (IOException ioe) {

                ioe.printStackTrace();

                return;

            }

        }

        doTest(address);

    }

    void doTest(SocketAddress peerAddress) {

        SctpMultiChannel channel = null;

        ByteBuffer buffer = ByteBuffer.allocate(Util.LARGE_BUFFER);

        MessageInfo info = MessageInfo.createOutgoing(null, 0);

        try {

            channel = SctpMultiChannel.open();

            /* setup an association implicitly by sending a small message */

            int streamNumber = 0;

            debug("sending to " + peerAddress + " on stream number: " + streamNumber);

            info = MessageInfo.createOutgoing(peerAddress, streamNumber);

            buffer.put(Util.SMALL_MESSAGE.getBytes("ISO-8859-1"));

            buffer.flip();

            int position = buffer.position();

            int remaining = buffer.remaining();

            debug("sending small message: " + buffer);

            int sent = channel.send(buffer, info);

            check(sent == remaining, "sent should be equal to remaining");

            check(buffer.position() == (position + sent),

                    "buffers position should have been incremented by sent");

            /* Receive the COMM_UP */

            buffer.clear();

            BranchNotificationHandler handler = new BranchNotificationHandler();

            info = channel.receive(buffer, null, handler);

            check(handler.receivedCommUp(), "COMM_UP no received");

            Set<Association> associations = channel.associations();

            check(!associations.isEmpty(),"There should be some associations");

            Association bassoc = associations.iterator().next();

            /* TEST 1: branch */

            SctpChannel bchannel = channel.branch(bassoc);

            check(!bchannel.getAllLocalAddresses().isEmpty(),

                                   "branched channel should be bound");

            check(!bchannel.getRemoteAddresses().isEmpty(),

                                   "branched channel should be connected");

            check(channel.associations().isEmpty(),

                  "there should be no associations since the only one was branched off");

            buffer.clear();

            info = bchannel.receive(buffer, null, null);

            buffer.flip();

            check(info != null, "info is null");

            check(info.streamNumber() == streamNumber,

                    "message not sent on the correct stream");

            check(info.bytes() == Util.SMALL_MESSAGE.getBytes("ISO-8859-1").

                  length, "bytes received not equal to message length");

            check(info.bytes() == buffer.remaining(), "bytes != remaining");

            check(Util.compare(buffer, Util.SMALL_MESSAGE),

              "received message not the same as sent message");

        } catch (IOException ioe) {

            unexpected(ioe);

        } finally {

            clientFinishedLatch.countDown();

            try { serverFinishedLatch.await(10L, TimeUnit.SECONDS); }

            catch (InterruptedException ie) { unexpected(ie); }

            if (channel != null) {

                try { channel.close(); }

                catch (IOException e) { unexpected (e);}

            }

        }

    }

    class Server implements Runnable

    {

        final InetSocketAddress serverAddr;

        private SctpMultiChannel serverChannel;

        public Server() throws IOException {

            serverChannel = SctpMultiChannel.open().bind(null);

            java.util.Set<SocketAddress> addrs = serverChannel.getAllLocalAddresses();

            if (addrs.isEmpty())

                debug("addrs should not be empty");

            serverAddr = (InetSocketAddress) addrs.iterator().next();

        }

        public void start() {

            (new Thread(this, "Server-"  + serverAddr.getPort())).start();

        }

        public InetSocketAddress address() {

            return serverAddr;

        }

        @Override

        public void run() {

            ByteBuffer buffer = ByteBuffer.allocateDirect(Util.LARGE_BUFFER);

            try {

                MessageInfo info;

                /* receive a small message */

                do {

                    info = serverChannel.receive(buffer, null, null);

                    if (info == null) {

                        fail("Server: unexpected null from receive");

                            return;

                    }

                } while (!info.isComplete());

                buffer.flip();

                check(info != null, "info is null");

                check(info.streamNumber() == 0,

                        "message not sent on the correct stream");

                check(info.bytes() == Util.SMALL_MESSAGE.getBytes("ISO-8859-1").

                      length, "bytes received not equal to message length");

                check(info.bytes() == buffer.remaining(), "bytes != remaining");

                check(Util.compare(buffer, Util.SMALL_MESSAGE),

                  "received message not the same as sent message");

                check(info != null, "info is null");

                Set<Association> assocs = serverChannel.associations();

                check(assocs.size() == 1, "there should be only one association");

                /* echo the message */

                debug("Server: echoing first message");

                buffer.flip();

                debug("Server: sent " + bytes + "bytes");

                clientFinishedLatch.await(10L, TimeUnit.SECONDS);

                serverFinishedLatch.countDown();

            } catch (IOException ioe) {

                unexpected(ioe);

            } catch (InterruptedException ie) {

                unexpected(ie);

            } finally {

                try { if (serverChannel != null) serverChannel.close(); }

                catch (IOException  unused) {}

            }

        }

    }

    class BranchNotificationHandler extends AbstractNotificationHandler<Object>

    {

        boolean receivedCommUp;  // false

        boolean receivedCommUp() {

            return receivedCommUp;

        }

        @Override

        public HandlerResult handleNotification(

                AssociationChangeNotification notification, Object attachment) {

            AssocChangeEvent event = notification.event();

            debug("AssociationChangeNotification");

            debug("  Association: " + notification.association());

            debug("  Event: " + event);

            if (event.equals(AssocChangeEvent.COMM_UP))

                receivedCommUp = true;

            return HandlerResult.RETURN;

        }

        /* A ShutdownNotification handler is provided to ensure that no

         * shutdown notification are being handled since we don't expect

         * to receive them. This is not part of branch testing, it just

         * fits here to test another bug. */

        @Override

        public HandlerResult handleNotification(

                ShutdownNotification notification, Object attachment) {

            debug("ShutdownNotification");

            debug("  Association: " + notification.association());

            fail("Shutdown should not be received");

            return HandlerResult.RETURN;

        }

    }

        //--------------------- Infrastructure ---------------------------

    boolean debug = true;

    volatile int passed = 0, failed = 0;

    void pass() {passed++;}

    void fail() {failed++; Thread.dumpStack();}

    void fail(String msg) {System.err.println(msg); fail();}

    void unexpected(Throwable t) {failed++; t.printStackTrace();}

    void check(boolean cond) {if (cond) pass(); else fail();}

    void check(boolean cond, String failMessage) {if (cond) pass(); else fail(failMessage);}

    void debug(String message) {if(debug) { System.out.println(message); }  }

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

        Class<?> k = new Object(){}.getClass().getEnclosingClass();

        try {k.getMethod("instanceMain",String[].class)

                .invoke( k.newInstance(), (Object) args);}

        catch (Throwable e) {throw e.getCause();}}

    public void instanceMain(String[] args) throws Throwable {

        try {test(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}