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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