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 public abstract static class Pump {
45 abstract void register(StreamPumper d);
46 }
47
48 /**
49 * OutputStream -> Pump adapter
50 */
51 public final 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 public abstract static class LinePump extends Pump {
67 @Override
68 final void register(StreamPumper sp) {
69 sp.addLineProcessor(this);
70 }
71
72 protected abstract 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
81 public StreamPumper(InputStream in) {
82 this.in = in;
83 }
84
85 /**
86 * Create a StreamPumper that reads from in and writes to out.
87 *
88 * @param in The stream to read from.
89 * @param out The stream to write to.
90 */
91 public StreamPumper(InputStream in, OutputStream out) {
92 this(in);
93 this.addOutputStream(out);
94 }
95
96 /**
97 * Implements Thread.run(). Continuously read from {@code in} and write to
98 * {@code out} until {@code in} has reached end of stream. Abort on
99 * interruption. Abort on IOExceptions.
100 */
101 @Override
102 public void run() {
103 try (BufferedInputStream is = new BufferedInputStream(in)) {
104 ByteArrayOutputStream lineBos = new ByteArrayOutputStream();
105 byte[] buf = new byte[BUF_SIZE];
106 int len = 0;
107 int linelen = 0;
108
109 while ((len = is.read(buf)) > 0 && !Thread.interrupted()) {
110 for (OutputStream out : outStreams) {
111 out.write(buf, 0, len);
112 }
113 if (!linePumps.isEmpty()) {
114 int i = 0;
115 int lastcrlf = -1;
116 while (i < len) {
117 if (buf[i] == '\n' || buf[i] == '\r') {
118 int bufLinelen = i - lastcrlf - 1;
119 if (bufLinelen > 0) {
120 lineBos.write(buf, lastcrlf + 1, bufLinelen);
121 }
122 linelen += bufLinelen;
123
124 if (linelen > 0) {
125 lineBos.flush();
126 final String line = lineBos.toString();
127 linePumps.forEach((lp) -> lp.processLine(line));
128 lineBos.reset();
129 linelen = 0;
130 }
131 lastcrlf = i;
132 }
133
134 i++;
135 }
136 if (lastcrlf == -1) {
137 lineBos.write(buf, 0, len);
138 linelen += len;
139 } else if (lastcrlf < len - 1) {
140 lineBos.write(buf, lastcrlf + 1, len - lastcrlf - 1);
141 linelen += len - lastcrlf - 1;
142 }
143 }
144 }
145
146 } catch (IOException e) {
147 e.printStackTrace();
148 } finally {
149 for (OutputStream out : outStreams) {
150 try {
151 out.flush();
152 } catch (IOException e) {}
153 }
154 try {
155 in.close();
156 } catch (IOException e) {}
157 }
158 }
159
160 final void addOutputStream(OutputStream out) {
161 outStreams.add(out);
162 }
163
164 final void addLineProcessor(LinePump lp) {
165 linePumps.add(lp);
166 }
167
168 public final StreamPumper addPump(Pump ... pump) {
169 if (processing.get()) {
170 throw new IllegalStateException("Can not modify pumper while " +
171 "processing is in progress");
172 }
173 for (Pump p : pump) {
174 p.register(this);
175 }
176 return this;
177 }
178
179 public final Future<Void> process() {
180 if (!processing.compareAndSet(false, true)) {
181 throw new IllegalStateException("Can not re-run the processing");
182 }
183 FutureTask<Void> result = new FutureTask<>(this, null);
184 Thread t = new Thread(result);
185 t.setDaemon(true);
186 t.start();
187
188 return result;
189 }
190 }