| /* |
| * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/impl/io/SocketInputBuffer.java $ |
| * $Revision: 560358 $ |
| * $Date: 2007-07-27 12:30:42 -0700 (Fri, 27 Jul 2007) $ |
| * |
| * ==================================================================== |
| * 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.impl.io; |
| |
| import java.io.IOException; |
| import java.io.InterruptedIOException; |
| import java.net.Socket; |
| import java.net.SocketTimeoutException; |
| |
| import java.net.SocketTimeoutException; |
| import org.apache.http.params.HttpParams; |
| |
| |
| /** |
| * {@link Socket} bound session input buffer. |
| * |
| * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> |
| * |
| * @version $Revision: 560358 $ |
| * |
| * @since 4.0 |
| */ |
| public class SocketInputBuffer extends AbstractSessionInputBuffer { |
| |
| private final Socket socket; |
| |
| public SocketInputBuffer( |
| final Socket socket, |
| int buffersize, |
| final HttpParams params) throws IOException { |
| super(); |
| if (socket == null) { |
| throw new IllegalArgumentException("Socket may not be null"); |
| } |
| this.socket = socket; |
| // BEGIN android-changed |
| // Workaround for http://b/3514259. We take 'buffersize' as a hint in |
| // the weakest sense, and always use an 8KiB heap buffer and leave the |
| // kernel buffer size alone, trusting the system to have set a |
| // network-appropriate default. |
| init(socket.getInputStream(), 8192, params); |
| // END android-changed |
| } |
| |
| public boolean isDataAvailable(int timeout) throws IOException { |
| boolean result = hasBufferedData(); |
| if (!result) { |
| int oldtimeout = this.socket.getSoTimeout(); |
| try { |
| this.socket.setSoTimeout(timeout); |
| fillBuffer(); |
| result = hasBufferedData(); |
| } catch (InterruptedIOException e) { |
| if (!(e instanceof SocketTimeoutException)) { |
| throw e; |
| } |
| } finally { |
| socket.setSoTimeout(oldtimeout); |
| } |
| } |
| return result; |
| } |
| |
| // BEGIN android-added |
| /** |
| * Returns true if the connection is probably functional. It's insufficient |
| * to rely on isDataAvailable() returning normally; that approach cannot |
| * distinguish between an exhausted stream and a stream with zero bytes |
| * buffered. |
| * |
| * @hide |
| */ |
| public boolean isStale() throws IOException { |
| if (hasBufferedData()) { |
| return false; |
| } |
| int oldTimeout = this.socket.getSoTimeout(); |
| try { |
| this.socket.setSoTimeout(1); |
| return fillBuffer() == -1; |
| } catch (SocketTimeoutException e) { |
| return false; // the connection is not stale; hooray |
| } catch (IOException e) { |
| return true; // the connection is stale, the read or soTimeout failed. |
| } finally { |
| this.socket.setSoTimeout(oldTimeout); |
| } |
| } |
| // END android-added |
| } |