1 /*
2  * Copyright (c) 1998, 2012, 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 import java.io.InputStream;
25 import java.io.InterruptedIOException;
26 import java.io.IOException;
27 import java.io.OutputStream;
28 
29 /**
30  * Pipe output of one stream into input of another.
31  */
32 public class StreamPipe extends Thread {
33 
34     private InputStream in;
35     private OutputStream out;
36 
37     private static Object countLock = new Object();
38     private static int count = 0;
39 
40     /**
41      * StreamPipe constructor : should only be called by plugTogether() method.
42      */
StreamPipe(InputStream in, OutputStream out, String name)43     private StreamPipe(InputStream in, OutputStream out, String name) {
44         super(name);
45         this.in  = in;
46         this.out = out;
47     }
48 
49     /**
50      * Creates a StreamPipe thread that copies in to out and returns
51      * the created instance.
52      */
plugTogether(InputStream in, OutputStream out)53     public static StreamPipe plugTogether(InputStream in, OutputStream out) {
54         String name;
55 
56         synchronized (countLock) {
57             name = "java.rmi.testlibrary.StreamPipe-" + (count++);
58         }
59 
60         StreamPipe pipe = new StreamPipe(in, out, name);
61         pipe.setDaemon(true);
62         pipe.start();
63         return pipe;
64     }
65 
66     // Starts redirection of streams.
run()67     public void run() {
68         try {
69             byte[] buf = new byte[1024];
70 
71             while (true) {
72                 int nr = in.read(buf);
73                 if (nr == -1)
74                     break;
75                 out.write(buf, 0, nr);
76             }
77         } catch (InterruptedIOException iioe) {
78             // Thread interrupted during IO operation. Terminate StreamPipe.
79             return;
80         } catch (IOException e) {
81             System.err.println("*** IOException in StreamPipe.run:");
82             e.printStackTrace();
83         }
84     }
85 }
86