1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.exec;
19
20 import java.io.InputStream;
21 import java.io.OutputStream;
22
23 import org.apache.commons.exec.util.DebugUtils;
24
25 /**
26 * Copies all data from an System.input stream to an output stream of the executed process.
27 */
28 public class InputStreamPumper implements Runnable {
29
30 /**
31 * Sleep time in milliseconds.
32 */
33 public static final int SLEEPING_TIME = 100;
34
35 /** The input stream to pump from. */
36 private final InputStream is;
37
38 /** The output stream to pmp into. */
39 private final OutputStream os;
40
41 /** Flag to stop the stream pumping. */
42 private volatile boolean stop;
43
44 /**
45 * Create a new stream pumper.
46 *
47 * @param is input stream to read data from.
48 * @param os output stream to write data to.
49 */
50 public InputStreamPumper(final InputStream is, final OutputStream os) {
51 this.is = is;
52 this.os = os;
53 this.stop = false;
54 }
55
56 /**
57 * Copies data from the input stream to the output stream. Terminates as soon as the input stream is closed or an error occurs.
58 */
59 @Override
60 public void run() {
61 try {
62 while (!stop) {
63 while (is.available() > 0 && !stop) {
64 os.write(is.read());
65 }
66 os.flush();
67 Thread.sleep(SLEEPING_TIME);
68 }
69 } catch (final Exception e) {
70 final String msg = "Got exception while reading/writing the stream";
71 DebugUtils.handleException(msg, e);
72 }
73 }
74
75 /**
76 * Requests processing to stop.
77 */
78 public void stopProcessing() {
79 stop = true;
80 }
81
82 }