All Downloads are FREE. Search and download functionalities are using the official Maven repository.

com.facebook.presto.jdbc.internal.okhttp3.Dns Maven / Gradle / Ivy

There is a newer version: 0.289
Show newest version
/*
 * Copyright (C) 2012 Square, Inc.
 *
 * Licensed 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 com.facebook.presto.jdbc.internal.okhttp3;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.List;

/**
 * A domain name service that resolves IP addresses for host names. Most applications will use the
 * {@linkplain #SYSTEM system DNS service}, which is the default. Some applications may provide
 * their own implementation to use a different DNS server, to prefer IPv6 addresses, to prefer IPv4
 * addresses, or to force a specific known IP address.
 *
 * 

Implementations of this interface must be safe for concurrent use. */ public interface Dns { /** * A DNS that uses {@link InetAddress#getAllByName} to ask the underlying operating system to * lookup IP addresses. Most custom {@link Dns} implementations should delegate to this instance. */ Dns SYSTEM = new Dns() { @Override public List lookup(String hostname) throws UnknownHostException { if (hostname == null) throw new UnknownHostException("hostname == null"); return Arrays.asList(InetAddress.getAllByName(hostname)); } }; /** * Returns the IP addresses of {@code hostname}, in the order they will be attempted by OkHttp. If * a connection to an address fails, OkHttp will retry the connection with the next address until * either a connection is made, the set of IP addresses is exhausted, or a limit is exceeded. */ List lookup(String hostname) throws UnknownHostException; }





© 2015 - 2024 Weber Informatics LLC | Privacy Policy