Java example source code file (UnderscoreHost.java)

This example Java source code file (UnderscoreHost.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

hostname, hostverifyingsocketfactory, ioexception, malformedurlexception, net, network, parsing, registry, remoteexception, rmi, rmisocketfactory, runtimeexception, serversocket, string, underscorehost, unicastremoteobject

The UnderscoreHost.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 5083594
  * @summary Ensure that Naming.java correctly parses host names with '_' in
  * them.
  * @author Vinod Johnson
  *
  * @library ../testlibrary
  * @build TestLibrary UnderscoreHost_Stub
  * @run main/othervm UnderscoreHost
 */

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

public class UnderscoreHost extends UnicastRemoteObject implements Remote {
    private static final String HOSTNAME = "foo_bar";
    private static final String NAME = "name";
    /*
     * The socket factory captures the host name of the parsed URL, and
     * then connects to the local host.
     */
    private static class HostVerifyingSocketFactory extends RMISocketFactory {
        String host;

        public synchronized Socket createSocket(String host, int port)
            throws IOException  {
            if (this.host == null) {
                // Only set it the first time, subsequent DGC dirty calls
                // will be local host
                this.host = host;
            }
            return new Socket("localhost", port);
        }
        public ServerSocket createServerSocket(int port) throws IOException {
            return new ServerSocket(port);
        }
    }

    public UnderscoreHost() throws RemoteException {};

    public static void main(String args[]) {
        UnderscoreHost t = null;
        try {
            HostVerifyingSocketFactory hvf = new HostVerifyingSocketFactory();
            RMISocketFactory.setSocketFactory(hvf);
            Registry r = TestLibrary.createRegistryOnUnusedPort();
            int port = TestLibrary.getRegistryPort(r);
            t = new UnderscoreHost();
            r.rebind(NAME, t);
            Naming.lookup("rmi://" + HOSTNAME +
                          ":" + port + "/" + NAME);
            /*
             * This test is coded to pass whether java.net.URI obeys
             * RFC 2396 or RFC 3986 (see 5085902, 6394131, etc.).
             *
             * If java.net.URI obeys RFC 3986, so host names may
             * contain underscores, then the Naming.lookup invocation
             * should succeed-- but the host actually connected to
             * must equal HOSTNAME.
             */
            if (!hvf.host.equals(HOSTNAME)) {
                throw new RuntimeException(
                    "java.rmi.Naming Parsing error:" +
                    hvf.host + ":" + HOSTNAME);
            }
        } catch (MalformedURLException e) {
            /*
             * If java.net.URI obeys RFC 2396, so host names must not
             * contain underscores, then the Naming.lookup invocation
             * should throw MalformedURLException-- so this is OK.
             */
        } catch (IOException ioe) {
            TestLibrary.bomb(ioe);
        } catch (java.rmi.NotBoundException nbe) {
            TestLibrary.bomb(nbe);
        } finally {
            TestLibrary.unexport(t);
        }

    }
}