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 38 import org.apache.http.params.HttpParams; 39 40 41 /** 42 * {@link Socket} bound session input buffer. 43 * 44 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> 45 * 46 * @version $Revision: 560358 $ 47 * 48 * @since 4.0 49 */ 50 public class SocketInputBuffer extends AbstractSessionInputBuffer { 51 52 static private final Class SOCKET_TIMEOUT_CLASS = SocketTimeoutExceptionClass(); 53 54 /** 55 * Returns <code>SocketTimeoutExceptionClass<code> or <code>null</code> if the class 56 * does not exist. 57 * 58 * @return <code>SocketTimeoutExceptionClass<code>, or <code>null</code> if unavailable. 59 */ SocketTimeoutExceptionClass()60 static private Class SocketTimeoutExceptionClass() { 61 try { 62 return Class.forName("java.net.SocketTimeoutException"); 63 } catch (ClassNotFoundException e) { 64 return null; 65 } 66 } 67 isSocketTimeoutException(final InterruptedIOException e)68 private static boolean isSocketTimeoutException(final InterruptedIOException e) { 69 if (SOCKET_TIMEOUT_CLASS != null) { 70 return SOCKET_TIMEOUT_CLASS.isInstance(e); 71 } else { 72 return true; 73 } 74 } 75 76 private final Socket socket; 77 SocketInputBuffer( final Socket socket, int buffersize, final HttpParams params)78 public SocketInputBuffer( 79 final Socket socket, 80 int buffersize, 81 final HttpParams params) throws IOException { 82 super(); 83 if (socket == null) { 84 throw new IllegalArgumentException("Socket may not be null"); 85 } 86 this.socket = socket; 87 if (buffersize < 0) { 88 buffersize = socket.getReceiveBufferSize(); 89 } 90 if (buffersize < 1024) { 91 buffersize = 1024; 92 } 93 init(socket.getInputStream(), buffersize, params); 94 } 95 isDataAvailable(int timeout)96 public boolean isDataAvailable(int timeout) throws IOException { 97 boolean result = hasBufferedData(); 98 if (!result) { 99 int oldtimeout = this.socket.getSoTimeout(); 100 try { 101 this.socket.setSoTimeout(timeout); 102 fillBuffer(); 103 result = hasBufferedData(); 104 } catch (InterruptedIOException e) { 105 if (!isSocketTimeoutException(e)) { 106 throw e; 107 } 108 } finally { 109 socket.setSoTimeout(oldtimeout); 110 } 111 } 112 return result; 113 } 114 115 } 116