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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* Copyright (c) 2016, 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 8022640
* @summary Test verifies whether ServiceProvider API's of
* ServiceRegistry are safe for concurrent access.
* @run main ServiceRegistrySyncTest
*/
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Locale;
import javax.imageio.spi.ImageInputStreamSpi;
import javax.imageio.spi.ServiceRegistry;
import javax.imageio.stream.ImageInputStream;
public class ServiceRegistrySyncTest {
public static void main(String[] args) throws InterruptedException {
final ArrayList<Class<?>> services = new ArrayList<Class<?>>();
services.add(ImageInputStreamSpi.class);
final ServiceRegistry reg = new ServiceRegistry(services.iterator());
//create new thread for Registerer and Consumer Class
Thread registerer = new Thread(new Registerer(reg));
Thread consumer = new Thread(new Consumer(reg));
//run both registerer and consumer thread parallely
registerer.start();
consumer.start();
}
static class Consumer implements Runnable {
private final ServiceRegistry reg;
boolean go = true;
int duration;
long start, end;
public Consumer(ServiceRegistry r) {
reg = r;
//set 5000ms duration to run the test
duration = 5000;
}
@Override
public void run() {
start = System.currentTimeMillis();
end = start + duration;
while (start < end) {
//access the ServiceProvider API
reg.getServiceProviders(ImageInputStreamSpi.class, true);
start = System.currentTimeMillis();
}
}
}
static class Registerer implements Runnable {
private final ServiceRegistry reg;
boolean go = true;
int duration;
long start, end;
public Registerer(ServiceRegistry r) {
reg = r;
//set 5000ms duration to run the test
duration = 5000;
}
@Override
public void run() {
final int N = 20;
MyService[] services = new MyService[N];
for (int i = 0; i < N; i++) {
services[i] = new MyService();
}
start = System.currentTimeMillis();
end = start + duration;
while (start < end) {
//access the ServiceProvider API's
for (int i = 0; i < N; i++) {
reg.registerServiceProvider(services[i]);
}
for (int i = 0; i < N; i++) {
reg.deregisterServiceProvider(services[i]);
}
start = System.currentTimeMillis();
}
}
}
}
class MyService extends ImageInputStreamSpi {
public MyService() {
}
@Override
public String getDescription(Locale locale) {
return null;
}
@Override
public ImageInputStream createInputStreamInstance
(Object input, boolean useCache, File cacheDir) throws IOException {
return null;
}
}
|
