1 /* 2 * $Header: /home/cvs/jakarta-commons/httpclient/src/test/org/apache/commons/httpclient/server/BidiStreamProxy.java,v 1.1.2.1 2003/12/05 21:02:52 oglueck Exp $ 3 * $Revision: 1.1.2.1 $ 4 * $Date: 2003/12/05 21:02:52 $ 5 * 6 * ==================================================================== 7 * 8 * The Apache Software License, Version 1.1 9 * 10 * Copyright (c) 1999-2003 The Apache Software Foundation. All rights 11 * reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in 22 * the documentation and/or other materials provided with the 23 * distribution. 24 * 25 * 3. The end-user documentation included with the redistribution, if 26 * any, must include the following acknowlegement: 27 * "This product includes software developed by the 28 * Apache Software Foundation (http://www.apache.org/)." 29 * Alternately, this acknowlegement may appear in the software itself, 30 * if and wherever such third-party acknowlegements normally appear. 31 * 32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software 33 * Foundation" must not be used to endorse or promote products derived 34 * from this software without prior written permission. For written 35 * permission, please contact apache@apache.org. 36 * 37 * 5. Products derived from this software may not be called "Apache" 38 * nor may "Apache" appear in their names without prior written 39 * permission of the Apache Group. 40 * 41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 * ==================================================================== 54 * 55 * This software consists of voluntary contributions made by many 56 * individuals on behalf of the Apache Software Foundation. For more 57 * information on the Apache Software Foundation, please see 58 * <http://www.apache.org/>. 59 * 60 * [Additional notices, if required by prior licensing conditions] 61 * 62 */ 63 64 package org.apache.commons.httpclient.server; 65 66 import java.io.InputStream; 67 import java.io.OutputStream; 68 69 /*** 70 * Pumps data between a pair of input / output streams. Used to 71 * connect the two ends (left and right) of a bidirectional communication channel. 72 * Instances of this class are thread safe. 73 * 74 * @author Ortwin Glueck 75 */ 76 class BidiStreamProxy { 77 private StreamProxy leftToRight, rightToLeft; 78 private int state = 0; 79 80 /*** 81 * Sets up a new connection between two peers (left and right) 82 * @param leftIn input channel of the left peer 83 * @param leftOut output channel of the left peer 84 * @param rightIn input channel of the right peer 85 * @param rightOut output channel of the right peer 86 */ 87 public BidiStreamProxy(InputStream leftIn, OutputStream leftOut, InputStream rightIn, OutputStream rightOut) { 88 leftToRight = new StreamProxy(leftIn, rightOut); 89 rightToLeft = new StreamProxy(rightIn, leftOut); 90 } 91 92 /*** 93 * Starts pumping the information from left to right and vice versa. 94 * This is performed asynchronously so this method returns immediately. 95 */ 96 public synchronized void start() { 97 if (state != 0) throw new IllegalStateException("Can not start twice"); 98 leftToRight.start(); 99 rightToLeft.start(); 100 state = 1; 101 } 102 103 /*** 104 * Aborts the communication between the peers and releases all resources. 105 * Note: The method does not wait for the pump threads to terminate. 106 */ 107 public synchronized void abort() { 108 if (leftToRight != null) leftToRight.abort(); 109 if (rightToLeft != null) rightToLeft.abort(); 110 leftToRight = null; 111 rightToLeft = null; 112 } 113 114 /*** 115 * Blocks until all data has been copied. Basically calls the 116 * join method on the pump thread. 117 * @throws InterruptedException 118 */ 119 public void block() throws InterruptedException { 120 if (state != 1) throw new IllegalStateException("Can not block before started"); 121 leftToRight.block(); 122 rightToLeft.block(); 123 } 124 }

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