1 /*
2 * $Header: /home/cvs/jakarta-commons/httpclient/src/test/org/apache/commons/httpclient/server/StreamProxy.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.IOException;
67 import java.io.InputStream;
68 import java.io.OutputStream;
69
70 /***
71 * Pipes all data of an input stream through to an output stream asynchronously.
72 * Instances of this class are thread safe.
73 *
74 * @author Ortwin Glueck
75 */
76 class StreamProxy {
77 private InputStream in;
78 private OutputStream out;
79 private Pump pump = new Pump();
80 private Thread pumpThread = new Thread(pump, "Stream copier");
81 private int state = 0;
82
83 public StreamProxy(InputStream in, OutputStream out) {
84 this.in = in;
85 this.out = out;
86 }
87
88 public synchronized void start() {
89 if (state != 0) throw new IllegalStateException("Can not start again.");
90 state = 1;
91 pumpThread.start();
92 }
93
94 /***
95 * Returns immediately. The object must not be used again.
96 */
97 public void abort() {
98 if (state != 1) return;
99 state = 2;
100 pumpThread.interrupt();
101 dispose();
102 }
103
104 /***
105 * Blocks until all data has been copied. Basically calls the
106 * join method on the pump thread.
107 * @throws InterruptedException
108 */
109 public void block() throws InterruptedException {
110 if (state != 1) throw new IllegalStateException("Can not block before started");
111 pumpThread.join();
112 }
113
114 private void dispose() {
115 pumpThread = null;
116 pump = null;
117 in = null;
118 out = null;
119 }
120
121 private class Pump implements Runnable {
122
123 public void run() {
124 byte[] buffer = new byte[10000];
125 try {
126 while (!Thread.interrupted()) {
127 int len;
128 while ((len = in.read(buffer)) != -1) {
129 out.write(buffer, 0, len);
130 out.flush();
131 }
132 }
133 } catch(IOException e) {
134 /* expected if parties close connection */
135 e.printStackTrace();
136 } finally {
137 dispose();
138 }
139 }
140
141 }
142 }
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