Java example source code file (ReuseDefaultPort.java)

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Java - Java tags/keywords

ioexception, net, network, port, registry, remote, reusedefaultport, rmi, rmisocketfactory, serversocket

The ReuseDefaultPort.java Java example source code

/*
 * Copyright (c) 2005, 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 6269166
 * @summary After a remote object has been exported on an anonymous
 * port, it should be possible to export another remote object on an
 * explicit port (and with the same socket factories, if any) with the
 * same value as the actual port to which the first export got bound.
 * While the fact that this works (instead of failing with a
 * BindException) might seem odd and not to be expected, it has
 * historically worked with the J2SE RMI implementation, so it should
 * continue to work because existing applications might depend on it.
 * @author Peter Jones
 *
 * @library ../../testlibrary
 * @build TestLibrary
 * @run main/othervm ReuseDefaultPort
 */

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.rmi.Remote;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.RMISocketFactory;
import java.rmi.server.UnicastRemoteObject;

public class ReuseDefaultPort implements Remote {

    private static final int PORT = TestLibrary.getUnusedRandomPort();

    private ReuseDefaultPort() { }

    public static void main(String[] args) throws Exception {
        System.err.println("\nRegression test for bug 6269166\n");
        RMISocketFactory.setSocketFactory(new SF());
        Remote impl = new ReuseDefaultPort();
        Remote stub = UnicastRemoteObject.exportObject(impl, 0);
        System.err.println("- exported object: " + stub);
        try {
            Registry registry = LocateRegistry.createRegistry(PORT);
            System.err.println("- exported registry: " + registry);
            System.err.println("TEST PASSED");
        } finally {
            UnicastRemoteObject.unexportObject(impl, true);
        }
    }

    private static class SF extends RMISocketFactory {
        private static RMISocketFactory defaultFactory =
            RMISocketFactory.getDefaultSocketFactory();
        SF() { }
        public Socket createSocket(String host, int port) throws IOException {
            return defaultFactory.createSocket(host, port);
        }
        public ServerSocket createServerSocket(int port) throws IOException {
            if (port == 0) {
                port = PORT;
            }
            return defaultFactory.createServerSocket(port);
        }
    }
}