1 /*
2 * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 package jdk.test.lib.process;
25
26 import java.io.BufferedInputStream;
27 import java.io.ByteArrayOutputStream;
28 import java.io.OutputStream;
29 import java.io.InputStream;
30 import java.io.IOException;
31 import java.util.HashSet;
32 import java.util.Set;
33 import java.util.concurrent.Future;
34 import java.util.concurrent.FutureTask;
35 import java.util.concurrent.atomic.AtomicBoolean;
36
37 public final class StreamPumper implements Runnable {
38
39 private static final int BUF_SIZE = 256;
40
41 /**
42 * Pump will be called by the StreamPumper to process the incoming data
43 */
44 abstract public static class Pump {
45 abstract void register(StreamPumper d);
46 }
47
48 /**
49 * OutputStream -> Pump adapter
50 */
51 final public static class StreamPump extends Pump {
52 private final OutputStream out;
53 public StreamPump(OutputStream out) {
54 this.out = out;
55 }
56
57 @Override
58 void register(StreamPumper sp) {
59 sp.addOutputStream(out);
60 }
61 }
62
63 /**
64 * Used to process the incoming data line-by-line
65 */
66 abstract public static class LinePump extends Pump {
67 @Override
68 final void register(StreamPumper sp) {
69 sp.addLineProcessor(this);
70 }
71
72 abstract protected void processLine(String line);
73 }
74
75 private final InputStream in;
76 private final Set<OutputStream> outStreams = new HashSet<>();
77 private final Set<LinePump> linePumps = new HashSet<>();
78
79 private final AtomicBoolean processing = new AtomicBoolean(false);
80 private final FutureTask<Void> processingTask = new FutureTask<>(this, null);
81
82 public StreamPumper(InputStream in) {
83 this.in = in;
84 }
85
86 /**
87 * Create a StreamPumper that reads from in and writes to out.
88 *
89 * @param in The stream to read from.
90 * @param out The stream to write to.
91 */
92 public StreamPumper(InputStream in, OutputStream out) {
93 this(in);
94 this.addOutputStream(out);
95 }
96
97 /**
98 * Implements Thread.run(). Continuously read from {@code in} and write to
99 * {@code out} until {@code in} has reached end of stream. Abort on
100 * interruption. Abort on IOExceptions.
101 */
102 @Override
103 public void run() {
104 try (BufferedInputStream is = new BufferedInputStream(in)) {
105 ByteArrayOutputStream lineBos = new ByteArrayOutputStream();
106 byte[] buf = new byte[BUF_SIZE];
107 int len = 0;
108 int linelen = 0;
109
110 while ((len = is.read(buf)) > 0 && !Thread.interrupted()) {
111 for(OutputStream out : outStreams) {
112 out.write(buf, 0, len);
113 }
114 if (!linePumps.isEmpty()) {
115 int i = 0;
116 int lastcrlf = -1;
117 while (i < len) {
118 if (buf[i] == '\n' || buf[i] == '\r') {
119 int bufLinelen = i - lastcrlf - 1;
120 if (bufLinelen > 0) {
121 lineBos.write(buf, lastcrlf + 1, bufLinelen);
122 }
123 linelen += bufLinelen;
124
125 if (linelen > 0) {
126 lineBos.flush();
127 final String line = lineBos.toString();
128 linePumps.stream().forEach((lp) -> {
129 lp.processLine(line);
130 });
131 lineBos.reset();
132 linelen = 0;
133 }
134 lastcrlf = i;
135 }
136
137 i++;
138 }
139 if (lastcrlf == -1) {
140 lineBos.write(buf, 0, len);
141 linelen += len;
142 } else if (lastcrlf < len - 1) {
143 lineBos.write(buf, lastcrlf + 1, len - lastcrlf - 1);
144 linelen += len - lastcrlf - 1;
145 }
146 }
147 }
148
149 } catch (IOException e) {
150 e.printStackTrace();
151 } finally {
152 for(OutputStream out : outStreams) {
153 try {
154 out.flush();
155 } catch (IOException e) {}
156 }
157 try {
158 in.close();
159 } catch (IOException e) {}
160 }
161 }
162
163 final void addOutputStream(OutputStream out) {
164 outStreams.add(out);
165 }
166
167 final void addLineProcessor(LinePump lp) {
168 linePumps.add(lp);
169 }
170
171 final public StreamPumper addPump(Pump ... pump) {
172 if (processing.get()) {
173 throw new IllegalStateException("Can not modify pumper while " +
174 "processing is in progress");
175 }
176 for(Pump p : pump) {
177 p.register(this);
178 }
179 return this;
180 }
181
182 final public Future<Void> process() {
183 if (!processing.compareAndSet(false, true)) {
184 throw new IllegalStateException("Can not re-run the processing");
185 }
186 Thread t = new Thread(new Runnable() {
187 @Override
188 public void run() {
189 processingTask.run();
190 }
191 });
192 t.setDaemon(true);
193 t.start();
194
195 return processingTask;
196 }
197 }