| /* |
| * ==================================================================== |
| * 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| package org.apache.hc.client5.http.impl; |
| |
| import java.net.InetAddress; |
| import java.net.UnknownHostException; |
| import java.util.Arrays; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.hc.client5.http.DnsResolver; |
| import org.apache.hc.core5.annotation.Contract; |
| import org.apache.hc.core5.annotation.ThreadingBehavior; |
| import org.apache.hc.core5.util.Args; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * In-memory {@link DnsResolver} implementation. |
| * |
| * @since 4.2 |
| */ |
| @Contract(threading = ThreadingBehavior.STATELESS) |
| public class InMemoryDnsResolver implements DnsResolver { |
| |
| /** Logger associated to this class. */ |
| private static final Logger LOG = LoggerFactory.getLogger(InMemoryDnsResolver.class); |
| |
| /** |
| * In-memory collection that will hold the associations between a host name |
| * and an array of InetAddress instances. |
| */ |
| private final Map<String, InetAddress[]> dnsMap; |
| |
| /** |
| * Builds a DNS resolver that will resolve the host names against a |
| * collection held in-memory. |
| */ |
| public InMemoryDnsResolver() { |
| dnsMap = new ConcurrentHashMap<>(); |
| } |
| |
| /** |
| * Associates the given array of IP addresses to the given host in this DNS overrider. |
| * The IP addresses are assumed to be already resolved. |
| * |
| * @param host |
| * The host name to be associated with the given IP. |
| * @param ips |
| * array of IP addresses to be resolved by this DNS overrider to the given |
| * host name. |
| */ |
| public void add(final String host, final InetAddress... ips) { |
| Args.notNull(host, "Host name"); |
| Args.notNull(ips, "Array of IP addresses"); |
| dnsMap.put(host, ips); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public InetAddress[] resolve(final String host) throws UnknownHostException { |
| final InetAddress[] resolvedAddresses = dnsMap.get(host); |
| if (LOG.isInfoEnabled()) { |
| LOG.info("Resolving {} to {}", host, Arrays.deepToString(resolvedAddresses)); |
| } |
| if(resolvedAddresses == null){ |
| throw new UnknownHostException(host + " cannot be resolved"); |
| } |
| return resolvedAddresses; |
| } |
| |
| @Override |
| public String resolveCanonicalHostname(final String host) throws UnknownHostException { |
| final InetAddress[] resolvedAddresses = resolve(host); |
| if (resolvedAddresses.length > 0) { |
| return resolvedAddresses[0].getCanonicalHostName(); |
| } |
| return host; |
| } |
| } |