| /* |
| * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/conn/MultihomePlainSocketFactory.java $ |
| * $Revision: 653041 $ |
| * $Date: 2008-05-03 03:39:28 -0700 (Sat, 03 May 2008) $ |
| * |
| * ==================================================================== |
| * 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.http.conn; |
| |
| import java.io.IOException; |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.net.Socket; |
| import java.net.SocketTimeoutException; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Arrays; |
| |
| import org.apache.http.conn.scheme.PlainSocketFactory; |
| import org.apache.http.conn.scheme.SocketFactory; |
| import org.apache.http.params.HttpConnectionParams; |
| import org.apache.http.params.HttpParams; |
| |
| /** |
| * Socket factory that implements a simple multi-home fail-over on connect failure, |
| * provided the same hostname resolves to multiple {@link InetAddress}es. Please note |
| * the {@link #connectSocket(Socket, String, int, InetAddress, int, HttpParams)} |
| * method cannot be reliably interrupted by closing the socket returned by the |
| * {@link #createSocket()} method. |
| */ |
| public final class MultihomePlainSocketFactory implements SocketFactory { |
| |
| /** |
| * The factory singleton. |
| */ |
| private static final |
| MultihomePlainSocketFactory DEFAULT_FACTORY = new MultihomePlainSocketFactory(); |
| |
| /** |
| * Gets the singleton instance of this class. |
| * @return the one and only plain socket factory |
| */ |
| public static MultihomePlainSocketFactory getSocketFactory() { |
| return DEFAULT_FACTORY; |
| } |
| |
| /** |
| * Restricted default constructor. |
| */ |
| private MultihomePlainSocketFactory() { |
| super(); |
| } |
| |
| |
| // non-javadoc, see interface org.apache.http.conn.SocketFactory |
| public Socket createSocket() { |
| return new Socket(); |
| } |
| |
| /** |
| * Attempts to connects the socket to any of the {@link InetAddress}es the |
| * given host name resolves to. If connection to all addresses fail, the |
| * last I/O exception is propagated to the caller. |
| * |
| * @param sock socket to connect to any of the given addresses |
| * @param host Host name to connect to |
| * @param port the port to connect to |
| * @param localAddress local address |
| * @param localPort local port |
| * @param params HTTP parameters |
| * |
| * @throws IOException if an error occurs during the connection |
| * @throws SocketTimeoutException if timeout expires before connecting |
| */ |
| public Socket connectSocket(Socket sock, String host, int port, |
| InetAddress localAddress, int localPort, |
| HttpParams params) |
| throws IOException { |
| |
| if (host == null) { |
| throw new IllegalArgumentException("Target host may not be null."); |
| } |
| if (params == null) { |
| throw new IllegalArgumentException("Parameters may not be null."); |
| } |
| |
| if (sock == null) |
| sock = createSocket(); |
| |
| if ((localAddress != null) || (localPort > 0)) { |
| |
| // we need to bind explicitly |
| if (localPort < 0) |
| localPort = 0; // indicates "any" |
| |
| InetSocketAddress isa = |
| new InetSocketAddress(localAddress, localPort); |
| sock.bind(isa); |
| } |
| |
| int timeout = HttpConnectionParams.getConnectionTimeout(params); |
| |
| InetAddress[] inetadrs = InetAddress.getAllByName(host); |
| List<InetAddress> addresses = new ArrayList<InetAddress>(inetadrs.length); |
| addresses.addAll(Arrays.asList(inetadrs)); |
| Collections.shuffle(addresses); |
| |
| IOException lastEx = null; |
| for (InetAddress address: addresses) { |
| try { |
| sock.connect(new InetSocketAddress(address, port), timeout); |
| break; |
| } catch (SocketTimeoutException ex) { |
| throw ex; |
| } catch (IOException ex) { |
| // create new socket |
| sock = new Socket(); |
| // keep the last exception and retry |
| lastEx = ex; |
| } |
| } |
| if (lastEx != null) { |
| throw lastEx; |
| } |
| return sock; |
| } // connectSocket |
| |
| |
| /** |
| * Checks whether a socket connection is secure. |
| * This factory creates plain socket connections |
| * which are not considered secure. |
| * |
| * @param sock the connected socket |
| * |
| * @return <code>false</code> |
| * |
| * @throws IllegalArgumentException if the argument is invalid |
| */ |
| public final boolean isSecure(Socket sock) |
| throws IllegalArgumentException { |
| |
| if (sock == null) { |
| throw new IllegalArgumentException("Socket may not be null."); |
| } |
| // This class check assumes that createSocket() calls the constructor |
| // directly. If it was using javax.net.SocketFactory, we couldn't make |
| // an assumption about the socket class here. |
| if (sock.getClass() != Socket.class) { |
| throw new IllegalArgumentException |
| ("Socket not created by this factory."); |
| } |
| // This check is performed last since it calls a method implemented |
| // by the argument object. getClass() is final in java.lang.Object. |
| if (sock.isClosed()) { |
| throw new IllegalArgumentException("Socket is closed."); |
| } |
| |
| return false; |
| |
| } // isSecure |
| |
| |
| /** |
| * Compares this factory with an object. |
| * There is only one instance of this class. |
| * |
| * @param obj the object to compare with |
| * |
| * @return iff the argument is this object |
| */ |
| @Override |
| public boolean equals(Object obj) { |
| return (obj == this); |
| } |
| |
| /** |
| * Obtains a hash code for this object. |
| * All instances of this class have the same hash code. |
| * There is only one instance of this class. |
| */ |
| @Override |
| public int hashCode() { |
| return PlainSocketFactory.class.hashCode(); |
| } |
| |
| } |