StandardSocketFactory.java
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上传日期:2018-01-08
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文件大小:4k
- /**
- * 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.hadoop.net;
- import java.io.IOException;
- import java.net.InetAddress;
- import java.net.InetSocketAddress;
- import java.net.Socket;
- import java.net.UnknownHostException;
- import java.nio.channels.SocketChannel;
- import javax.net.SocketFactory;
- /**
- * Specialized SocketFactory to create sockets with a SOCKS proxy
- */
- public class StandardSocketFactory extends SocketFactory {
- /**
- * Default empty constructor (for use with the reflection API).
- */
- public StandardSocketFactory() {
- }
- /* @inheritDoc */
- @Override
- public Socket createSocket() throws IOException {
- /*
- * NOTE: This returns an NIO socket so that it has an associated
- * SocketChannel. As of now, this unfortunately makes streams returned
- * by Socket.getInputStream() and Socket.getOutputStream() unusable
- * (because a blocking read on input stream blocks write on output stream
- * and vice versa).
- *
- * So users of these socket factories should use
- * NetUtils.getInputStream(socket) and
- * NetUtils.getOutputStream(socket) instead.
- *
- * A solution for hiding from this from user is to write a
- * 'FilterSocket' on the lines of FilterInputStream and extend it by
- * overriding getInputStream() and getOutputStream().
- */
- return SocketChannel.open().socket();
- }
- /* @inheritDoc */
- @Override
- public Socket createSocket(InetAddress addr, int port) throws IOException {
- Socket socket = createSocket();
- socket.connect(new InetSocketAddress(addr, port));
- return socket;
- }
- /* @inheritDoc */
- @Override
- public Socket createSocket(InetAddress addr, int port,
- InetAddress localHostAddr, int localPort) throws IOException {
- Socket socket = createSocket();
- socket.bind(new InetSocketAddress(localHostAddr, localPort));
- socket.connect(new InetSocketAddress(addr, port));
- return socket;
- }
- /* @inheritDoc */
- @Override
- public Socket createSocket(String host, int port) throws IOException,
- UnknownHostException {
- Socket socket = createSocket();
- socket.connect(new InetSocketAddress(host, port));
- return socket;
- }
- /* @inheritDoc */
- @Override
- public Socket createSocket(String host, int port,
- InetAddress localHostAddr, int localPort) throws IOException,
- UnknownHostException {
- Socket socket = createSocket();
- socket.bind(new InetSocketAddress(localHostAddr, localPort));
- socket.connect(new InetSocketAddress(host, port));
- return socket;
- }
- /* @inheritDoc */
- @Override
- public boolean equals(Object obj) {
- if (this == obj)
- return true;
- if (obj == null)
- return false;
- if (!(obj instanceof StandardSocketFactory))
- return false;
- return true;
- }
- /* @inheritDoc */
- @Override
- public int hashCode() {
- // Dummy hash code (to make find bugs happy)
- return 47;
- }
-
- }