| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.bookkeeper.net; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.base.Preconditions.checkState; |
| |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.net.UnknownHostException; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Network Utilities. |
| */ |
| public class NetUtils { |
| private static final Logger logger = LoggerFactory.getLogger(NetUtils.class); |
| |
| /** |
| * Given a string representation of a host, return its ip address |
| * in textual presentation. |
| * |
| * @param name a string representation of a host: |
| * either a textual representation its IP address or its host name |
| * @return its IP address in the string format |
| */ |
| public static String normalizeHostName(String name) { |
| try { |
| return InetAddress.getByName(name).getHostAddress(); |
| } catch (UnknownHostException e) { |
| return name; |
| } |
| } |
| |
| /** |
| * Given a collection of string representation of hosts, return a list of |
| * corresponding IP addresses in the textual representation. |
| * |
| * @param names a collection of string representations of hosts |
| * @return a list of corresponding IP addresses in the string format |
| * @see #normalizeHostName(String) |
| */ |
| public static List<String> normalizeHostNames(Collection<String> names) { |
| List<String> hostNames = new ArrayList<String>(names.size()); |
| for (String name : names) { |
| hostNames.add(normalizeHostName(name)); |
| } |
| return hostNames; |
| } |
| |
| public static String resolveNetworkLocation(DNSToSwitchMapping dnsResolver, InetSocketAddress addr) { |
| List<String> names = new ArrayList<String>(1); |
| |
| if (dnsResolver.useHostName()) { |
| names.add(addr.getHostName()); |
| } else { |
| names.add(addr.getAddress().getHostAddress()); |
| } |
| |
| // resolve network addresses |
| List<String> rNames = dnsResolver.resolve(names); |
| checkNotNull(rNames, "DNS Resolver should not return null response."); |
| checkState(rNames.size() == 1, "Expected exactly one element"); |
| |
| return rNames.get(0); |
| } |
| |
| } |