Java example source code file (Accept.java)

This example Java source code file (Accept.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

acceptserver, alreadyconnectedexception, asynchronouscloseexception, closedbyinterruptexception, closedchannelexception, countdownlatch, inetsocketaddress, ioexception, net, network, notyetboundexception, object, sctpchannel, test, testsocketaddress, threading, threads, throwable

The Accept.java Java example source code

/*
 * 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.concurrent.CountDownLatch;
import java.nio.channels.AlreadyConnectedException;
import java.nio.channels.AsynchronousCloseException;
import java.nio.channels.NotYetBoundException;
import java.nio.channels.ClosedByInterruptException;
import java.nio.channels.ClosedChannelException;
import com.sun.nio.sctp.SctpChannel;
import com.sun.nio.sctp.SctpServerChannel;
import static java.lang.System.out;
import static java.lang.System.err;

public class Accept {
    static CountDownLatch acceptLatch = new CountDownLatch(1);
    static CountDownLatch closeByIntLatch = new CountDownLatch(1);
    static CountDownLatch asyncCloseLatch = new CountDownLatch(1);
    AcceptServer server = null;

    void test(String[] args) {
        SocketAddress address = 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 AcceptServer();
                server.start();
                address = server.address();
                debug("Server started and listening on " + address);
            } catch (IOException ioe) {
                ioe.printStackTrace();
                return;
            }
        }

        doClient(address);
    }

    void doClient(SocketAddress peerAddress) {
        SctpChannel channel = null;

        try {
            channel = SctpChannel.open(peerAddress, 0, 0);
            acceptLatch.await();

            /* for test 4 */
            closeByIntLatch.await();
            sleep(500);
            server.thread().interrupt();

            /* for test 5 */
            asyncCloseLatch.await();
            sleep(500);
            server.channel().close();

            /* wait for the server thread to finish */
            join(server.thread(), 10000);
        } catch (IOException ioe) {
            unexpected(ioe);
        } catch (InterruptedException ie) {
            unexpected(ie);
        } finally {
            try { if (channel != null) channel.close(); }
            catch (IOException e) { unexpected(e);}
        }
    }

    class AcceptServer implements Runnable
    {
        final InetSocketAddress serverAddr;
        private SctpServerChannel ssc;
        private Thread serverThread;

        public AcceptServer() throws IOException {
            ssc = SctpServerChannel.open();

            /* TEST 1: NotYetBoundException */
            debug("TEST 1: NotYetBoundException");
            try {
                ssc.accept();
                fail();
            } catch (NotYetBoundException nybe) {
                debug("  caught NotYetBoundException");
                pass();
            } catch (IOException ioe) {
                unexpected(ioe);
            }

            ssc.bind(null);
            java.util.Set<SocketAddress> addrs = ssc.getAllLocalAddresses();
            if (addrs.isEmpty())
                debug("addrs should not be empty");

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

            /* TEST 2: null if this channel is in non-blocking mode and no
             *         association is available to be accepted  */
            ssc.configureBlocking(false);
            debug("TEST 2: non-blocking mode null");
            try {
                SctpChannel sc = ssc.accept();
                check(sc == null, "non-blocking mode should return null");
            } catch (IOException ioe) {
                unexpected(ioe);
            } finally {
                ssc.configureBlocking(true);
            }
        }

        void start() {
            serverThread = new Thread(this, "AcceptServer-"  +
                                              serverAddr.getPort());
            serverThread.start();
        }

        InetSocketAddress address() {
            return serverAddr;
        }

        SctpServerChannel channel() {
            return ssc;
        }

        Thread thread() {
            return serverThread;
        }

        @Override
        public void run() {
            SctpChannel sc = null;
            try {
                /* TEST 3: accepted channel */
                debug("TEST 3: accepted channel");
                sc = ssc.accept();

                checkAcceptedChannel(sc);
                acceptLatch.countDown();

                /* TEST 4: ClosedByInterruptException */
                debug("TEST 4: ClosedByInterruptException");
                try {
                    closeByIntLatch.countDown();
                    ssc.accept();
                    fail();
                } catch (ClosedByInterruptException unused) {
                    debug("  caught ClosedByInterruptException");
                    pass();
                }

                /* TEST 5: AsynchronousCloseException */
                debug("TEST 5: AsynchronousCloseException");
                /* reset thread interrupt status */
                Thread.currentThread().interrupted();

                ssc = SctpServerChannel.open().bind(null);
                try {
                    asyncCloseLatch.countDown();
                    ssc.accept();
                    fail();
                } catch (AsynchronousCloseException unused) {
                    debug("  caught AsynchronousCloseException");
                    pass();
                }

                /* TEST 6: ClosedChannelException */
                debug("TEST 6: ClosedChannelException");
                try {
                    ssc.accept();
                    fail();
                } catch (ClosedChannelException unused) {
                    debug("  caught ClosedChannelException");
                    pass();
                }
                ssc = null;
            } catch (IOException ioe) {
                ioe.printStackTrace();
            } finally {
                try { if (ssc != null) ssc.close(); }
                catch (IOException  ioe) { unexpected(ioe); }
                try { if (sc != null) sc.close(); }
                catch (IOException  ioe) { unexpected(ioe); }
            }
        }
    }

    void checkAcceptedChannel(SctpChannel sc) {
        try {
            debug("Checking accepted SctpChannel");
            check(sc.association() != null,
                  "accepted channel should have an association");
            check(!(sc.getRemoteAddresses().isEmpty()),
                  "accepted channel should be connected");
            check(!(sc.isConnectionPending()),
                  "accepted channel should not have a connection pending");
            check(sc.isBlocking(),
                  "accepted channel should be blocking");
            try { sc.connect(new TestSocketAddress()); fail(); }
            catch (AlreadyConnectedException unused) { pass(); }
            try { sc.bind(new TestSocketAddress()); fail(); }
            catch (AlreadyConnectedException unused) { pass(); }
        } catch (IOException unused) { fail(); }
    }

    static class TestSocketAddress extends SocketAddress {}

        //--------------------- Infrastructure ---------------------------
    boolean debug = true;
    volatile int passed = 0, failed = 0;
    void pass() {passed++;}
    void fail() {failed++; Thread.dumpStack();}
    void fail(String msg) {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) { out.println(message); }  }
    void sleep(long millis) { try { Thread.currentThread().sleep(millis); }
                          catch(InterruptedException ie) { unexpected(ie); }}
    void join(Thread thread, long millis) { try { thread.join(millis); }
                          catch(InterruptedException ie) { unexpected(ie); }}
    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);}
        out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
        if (failed > 0) throw new AssertionError("Some tests failed");}

}