Java example source code file (Providers.java)

This example Java source code file (Providers.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

exception, net, network, providers, runtimeexception, string, stringtokenizer, test, util

The Providers.java Java example source code

/*
 * Copyright (c) 2007, 2011, 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 4762344
 * @summary 2nd nameservice provider is non functional
 * @compile -XDignore.symbol.file=true SimpleNameService.java
 *                                     Simple1NameServiceDescriptor.java
 *                                     Simple2NameServiceDescriptor.java
 * @run main/othervm -Dsun.net.spi.nameservice.provider.1=simple1,sun -Dsun.net.spi.nameservice.provider.2=simple2,sun Providers
 */

import java.net.*;
import java.util.*;


public class Providers {
    private static String[][] hostnames = new String[][] {
            // both providers know this host, but with different address
            new String[] {"blade", "10.0.0.1"},
            // provider1 knwos this host
            new String[] {"blade.domain1", "10.0.0.2"},
            // provider2 knows this host
            new String[] {"blade.domain2", "20.0.0.2"}
        };
    private static String[][] hostaddrs = new String[][] {
            new String[] {"10.0.0.1", "blade"},
            new String[] {"10.0.0.2", "blade.domain1"},
            new String[] {"20.0.0.2", "blade.domain2"}
        };

    public static void main(String[] args) throws Exception {
        for (int i = 0; i < hostnames.length; i++) {
            doLookup(hostnames[i][0], hostnames[i][1]);
        }
        for (int i = 0; i < hostaddrs.length; i++) {
            doReverseLookup(hostaddrs[i][0], hostaddrs[i][1]);
        }
    }

    private static void doLookup(String host, String addr) throws Exception {
        String res = InetAddress.getByName(host).getHostAddress();
        if (!res.equals(addr)) {
            throw new RuntimeException("Test failed: wrong address for host " + host);
        }
    }

    private static void doReverseLookup(String addr, String host) throws Exception {
        StringTokenizer tokenizer = new StringTokenizer(addr, ".");
        byte addrs[] = new byte[4];
        for (int i = 0; i < 4; i++) {
            addrs[i] = (byte)Integer.parseInt(tokenizer.nextToken());
        }
        String res = InetAddress.getByAddress(addrs).getHostName();
        if (!res.equals(host)) {
            throw new RuntimeException("Test failed: wrong host name for address " + addr);
        }
    }
}