1069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project/* 2069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/impl/io/SocketInputBuffer.java $ 3069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * $Revision: 560358 $ 4069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * $Date: 2007-07-27 12:30:42 -0700 (Fri, 27 Jul 2007) $ 5069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 6069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * ==================================================================== 7069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * Licensed to the Apache Software Foundation (ASF) under one 8069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * or more contributor license agreements. See the NOTICE file 9069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * distributed with this work for additional information 10069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * regarding copyright ownership. The ASF licenses this file 11069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * to you under the Apache License, Version 2.0 (the 12069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * "License"); you may not use this file except in compliance 13069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * with the License. You may obtain a copy of the License at 14069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 15069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 16069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 17069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * Unless required by applicable law or agreed to in writing, 18069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * software distributed under the License is distributed on an 19069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 20069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * KIND, either express or implied. See the License for the 21069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * specific language governing permissions and limitations 22069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * under the License. 23069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * ==================================================================== 24069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 25069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * This software consists of voluntary contributions made by many 26069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * individuals on behalf of the Apache Software Foundation. For more 27069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * information on the Apache Software Foundation, please see 28069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * <http://www.apache.org/>. 29069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 30069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project */ 31069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 32069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectpackage org.apache.http.impl.io; 33069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 34069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectimport java.io.IOException; 35069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectimport java.io.InterruptedIOException; 36069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectimport java.net.Socket; 37e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughesimport java.net.SocketTimeoutException; 38069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 39091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilsonimport java.net.SocketTimeoutException; 40069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectimport org.apache.http.params.HttpParams; 41069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 42069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 43069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project/** 44069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * {@link Socket} bound session input buffer. 45069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 46069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> 47069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 48069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * @version $Revision: 560358 $ 49e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes * 50069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * @since 4.0 51069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project */ 52069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectpublic class SocketInputBuffer extends AbstractSessionInputBuffer { 53069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 54069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project private final Socket socket; 55e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes 56069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project public SocketInputBuffer( 57e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes final Socket socket, 58e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes int buffersize, 59069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project final HttpParams params) throws IOException { 60069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project super(); 61069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project if (socket == null) { 62069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project throw new IllegalArgumentException("Socket may not be null"); 63069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } 64069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project this.socket = socket; 65e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes // BEGIN android-changed 66e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes // Workaround for http://b/3514259. We take 'buffersize' as a hint in 67e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes // the weakest sense, and always use an 8KiB heap buffer and leave the 68e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes // kernel buffer size alone, trusting the system to have set a 69e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes // network-appropriate default. 70e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes init(socket.getInputStream(), 8192, params); 71e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes // END android-changed 72069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } 73e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes 74069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project public boolean isDataAvailable(int timeout) throws IOException { 75069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project boolean result = hasBufferedData(); 76069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project if (!result) { 77069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project int oldtimeout = this.socket.getSoTimeout(); 78069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project try { 79069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project this.socket.setSoTimeout(timeout); 80069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project fillBuffer(); 81069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project result = hasBufferedData(); 82069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } catch (InterruptedIOException e) { 83e30b5b55806b31d1a61e2885b854dd7b8da1a07aElliott Hughes if (!(e instanceof SocketTimeoutException)) { 84069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project throw e; 85069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } 86069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } finally { 87069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project socket.setSoTimeout(oldtimeout); 88069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } 89069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } 90069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project return result; 91069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } 92069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 93091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson // BEGIN android-added 94091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson /** 95091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson * Returns true if the connection is probably functional. It's insufficient 96091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson * to rely on isDataAvailable() returning normally; that approach cannot 97091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson * distinguish between an exhausted stream and a stream with zero bytes 98091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson * buffered. 99091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson * 100091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson * @hide 101091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson */ 102091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson public boolean isStale() throws IOException { 103091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson if (hasBufferedData()) { 104091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson return false; 105091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson } 106091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson int oldTimeout = this.socket.getSoTimeout(); 107091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson try { 108091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson this.socket.setSoTimeout(1); 109091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson return fillBuffer() == -1; 110091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson } catch (SocketTimeoutException e) { 111091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson return false; // the connection is not stale; hooray 112091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson } catch (IOException e) { 113091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson return true; // the connection is stale, the read or soTimeout failed. 114091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson } finally { 115091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson this.socket.setSoTimeout(oldTimeout); 116091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson } 117091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson } 118091f7ca4958c6f41c79808913c84ceea56d73b12Jesse Wilson // END android-added 119069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project} 120