1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @bug 8005281
* @summary Test that the Properties storeToXML and loadFromXML methods are
* thread safe
* @key randomness
*/
import java.io.*;
import java.util.Properties;
import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
public class ConcurrentLoadAndStoreXML {
static final Random RAND = new Random();
static volatile boolean done;
/**
* Simple task that bashes on storeToXML and loadFromXML until the "done"
* flag is set.
*/
static class Basher implements Callable<Void> {
final Properties props;
Basher(Properties props) {
this.props = props;
}
public Void call() throws IOException {
while (!done) {
// store as XML format
ByteArrayOutputStream out = new ByteArrayOutputStream();
props.storeToXML(out, null, "UTF-8");
// load from XML format
Properties p = new Properties();
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
p.loadFromXML(in);
// check that the properties are as expected
if (!p.equals(props))
throw new RuntimeException("Properties not equal");
}
return null;
}
}
public static void main(String[] args) throws Exception {
final int NTASKS = 4 + RAND.nextInt(4);
// create Bashers with Properties of random keys and values
Basher[] basher = new Basher[NTASKS];
for (int i=0; i<NTASKS; i++) {
Properties props = new Properties();
for (int j=0; j<RAND.nextInt(100); j++) {
String key = "k" + RAND.nextInt(1000);
String value = "v" + RAND.nextInt(1000);
props.put(key, value);
}
basher[i] = new Basher(props);
}
ExecutorService pool = Executors.newFixedThreadPool(NTASKS);
try {
// kick off the bashers
Future<Void>[] task = new Future[NTASKS];
for (int i=0; i<NTASKS; i++) {
task[i] = pool.submit(basher[i]);
}
// give them time to interfere with each each
Thread.sleep(2000);
done = true;
// check the result
for (int i=0; i<NTASKS; i++) {
task[i].get();
}
} finally {
done = true;
pool.shutdown();
}
}
}
|
