Java tutorial
/* * Copyright 2017 The Netty Project * * The Netty Project 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 io.netty.resolver.dns; import io.netty.util.internal.UnstableApi; /** * Provides an opportunity to override which {@link DnsServerAddressStream} is used to resolve a specific hostname. * <p> * For example this can be used to represent <a href="https://linux.die.net/man/5/resolver">/etc/resolv.conf</a> and * <a href="https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man5/resolver.5.html"> * /etc/resolver</a>. */ @UnstableApi public interface DnsServerAddressStreamProvider { /** * Ask this provider for the name servers to query for {@code hostname}. * @param hostname The hostname for which to lookup the DNS server addressed to use. * If this is the final {@link DnsServerAddressStreamProvider} to be queried then generally empty * string or {@code '.'} correspond to the default {@link DnsServerAddressStream}. * @return The {@link DnsServerAddressStream} which should be used to resolve {@code hostname}. */ DnsServerAddressStream nameServerAddressStream(String hostname); }