1 /* 2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/impl/io/SocketInputBuffer.java $ 3 * $Revision: 560358 $ 4 * $Date: 2007-07-27 12:30:42 -0700 (Fri, 27 Jul 2007) $ 5 * 6 * ==================================================================== 7 * Licensed to the Apache Software Foundation (ASF) under one 8 * or more contributor license agreements. See the NOTICE file 9 * distributed with this work for additional information 10 * regarding copyright ownership. The ASF licenses this file 11 * to you under the Apache License, Version 2.0 (the 12 * "License"); you may not use this file except in compliance 13 * with the License. You may obtain a copy of the License at 14 * 15 * http://www.apache.org/licenses/LICENSE-2.0 16 * 17 * Unless required by applicable law or agreed to in writing, 18 * software distributed under the License is distributed on an 19 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 20 * KIND, either express or implied. See the License for the 21 * specific language governing permissions and limitations 22 * under the License. 23 * ==================================================================== 24 * 25 * This software consists of voluntary contributions made by many 26 * individuals on behalf of the Apache Software Foundation. For more 27 * information on the Apache Software Foundation, please see 28 * <http://www.apache.org/>. 29 * 30 */ 31 32 package org.apache.http.impl.io; 33 34 import java.io.IOException; 35 import java.io.InterruptedIOException; 36 import java.net.Socket; 37 import java.net.SocketTimeoutException; 38 39 import java.net.SocketTimeoutException; 40 import org.apache.http.params.HttpParams; 41 42 43 /** 44 * {@link Socket} bound session input buffer. 45 * 46 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> 47 * 48 * @version $Revision: 560358 $ 49 * 50 * @since 4.0 51 * 52 * @deprecated Please use {@link java.net.URL#openConnection} instead. 53 * Please visit <a href="http://android-developers.blogspot.com/2011/09/androids-http-clients.html">this webpage</a> 54 * for further details. 55 */ 56 @Deprecated 57 public class SocketInputBuffer extends AbstractSessionInputBuffer { 58 59 private final Socket socket; 60 SocketInputBuffer( final Socket socket, int buffersize, final HttpParams params)61 public SocketInputBuffer( 62 final Socket socket, 63 int buffersize, 64 final HttpParams params) throws IOException { 65 super(); 66 if (socket == null) { 67 throw new IllegalArgumentException("Socket may not be null"); 68 } 69 this.socket = socket; 70 // BEGIN android-changed 71 // Workaround for http://b/3514259. We take 'buffersize' as a hint in 72 // the weakest sense, and always use an 8KiB heap buffer and leave the 73 // kernel buffer size alone, trusting the system to have set a 74 // network-appropriate default. 75 init(socket.getInputStream(), 8192, params); 76 // END android-changed 77 } 78 isDataAvailable(int timeout)79 public boolean isDataAvailable(int timeout) throws IOException { 80 boolean result = hasBufferedData(); 81 if (!result) { 82 int oldtimeout = this.socket.getSoTimeout(); 83 try { 84 this.socket.setSoTimeout(timeout); 85 fillBuffer(); 86 result = hasBufferedData(); 87 } catch (InterruptedIOException e) { 88 if (!(e instanceof SocketTimeoutException)) { 89 throw e; 90 } 91 } finally { 92 socket.setSoTimeout(oldtimeout); 93 } 94 } 95 return result; 96 } 97 98 // BEGIN android-added 99 /** 100 * Returns true if the connection is probably functional. It's insufficient 101 * to rely on isDataAvailable() returning normally; that approach cannot 102 * distinguish between an exhausted stream and a stream with zero bytes 103 * buffered. 104 */ isStale()105 public boolean isStale() throws IOException { 106 if (hasBufferedData()) { 107 return false; 108 } 109 int oldTimeout = this.socket.getSoTimeout(); 110 try { 111 this.socket.setSoTimeout(1); 112 return fillBuffer() == -1; 113 } catch (SocketTimeoutException e) { 114 return false; // the connection is not stale; hooray 115 } catch (IOException e) { 116 return true; // the connection is stale, the read or soTimeout failed. 117 } finally { 118 this.socket.setSoTimeout(oldTimeout); 119 } 120 } 121 // END android-added 122 } 123