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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.util;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinService;
import com.vaadin.server.VaadinSession;
import com.vaadin.ui.UI;
import org.easymock.EasyMock;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import java.lang.ref.WeakReference;
import java.lang.reflect.Field;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import static org.junit.Assert.assertNull;
public class CurrentInstanceTest {
@Before
public void clearExistingThreadLocals() {
// Ensure no previous test left some thread locals hanging
CurrentInstance.clearAll();
}
@Test
public void testInitiallyCleared() throws Exception {
assertCleared();
}
@Test
public void testClearedAfterRemove() throws Exception {
CurrentInstance.set(CurrentInstanceTest.class, this);
Assert.assertEquals(this,
CurrentInstance.get(CurrentInstanceTest.class));
CurrentInstance.set(CurrentInstanceTest.class, null);
assertCleared();
}
@Test
public void testClearedWithClearAll() throws Exception {
CurrentInstance.set(CurrentInstanceTest.class, this);
Assert.assertEquals(this,
CurrentInstance.get(CurrentInstanceTest.class));
CurrentInstance.clearAll();
assertCleared();
}
private void assertCleared() throws SecurityException, NoSuchFieldException,
IllegalAccessException {
Assert.assertNull(getInternalCurrentInstanceVariable().get());
}
private ThreadLocal<Map<Class<?>, CurrentInstance>> getInternalCurrentInstanceVariable()
throws SecurityException, NoSuchFieldException,
IllegalAccessException {
Field f = CurrentInstance.class.getDeclaredField("instances");
f.setAccessible(true);
return (ThreadLocal<Map<Class<?>, CurrentInstance>>) f
.get(null);
}
public void testInheritedClearedAfterRemove() {
}
private static class UIStoredInCurrentInstance extends UI {
@Override
protected void init(VaadinRequest request) {
}
}
private static class SessionStoredInCurrentInstance extends VaadinSession {
public SessionStoredInCurrentInstance(VaadinService service) {
super(service);
}
}
@Test
public void testRestoringNullUIWorks() throws Exception {
// First make sure current instance is empty
CurrentInstance.clearAll();
// Then store a new UI in there
Map<Class<?>, CurrentInstance> old = CurrentInstance
.setCurrent(new UIStoredInCurrentInstance());
// Restore the old values and assert that the UI is null again
CurrentInstance.restoreInstances(old);
assertNull(CurrentInstance.get(UI.class));
}
@Test
public void testRestoringNullSessionWorks() throws Exception {
// First make sure current instance is empty
CurrentInstance.clearAll();
// Then store a new session in there
Map<Class<?>, CurrentInstance> old = CurrentInstance
.setCurrent(new SessionStoredInCurrentInstance(
EasyMock.createNiceMock(VaadinService.class)));
// Restore the old values and assert that the session is null again
CurrentInstance.restoreInstances(old);
assertNull(CurrentInstance.get(VaadinSession.class));
assertNull(CurrentInstance.get(VaadinService.class));
}
@Test
public void testRestoreWithGarbageCollectedValue()
throws InterruptedException {
VaadinSession session1 = new VaadinSession(null) {
@Override
public String toString() {
return "First session";
}
};
VaadinSession session2 = new VaadinSession(null) {
@Override
public String toString() {
return "Second session";
}
};
VaadinSession.setCurrent(session1);
Map<Class<?>, CurrentInstance> previous = CurrentInstance
.setCurrent(session2);
// Use weak ref to verify object is collected
WeakReference<VaadinSession> ref = new WeakReference<>(
session1);
session1 = null;
waitUntilGarbageCollected(ref);
CurrentInstance.restoreInstances(previous);
Assert.assertNull(VaadinSession.getCurrent());
}
private static void waitUntilGarbageCollected(WeakReference<?> ref)
throws InterruptedException {
for (int i = 0; i < 50; i++) {
System.gc();
if (ref.get() == null) {
return;
}
Thread.sleep(100);
}
Assert.fail("Value was not garbage collected.");
}
@Test
public void nonInheritableThreadLocals()
throws InterruptedException, ExecutionException {
CurrentInstance.clearAll();
CurrentInstance.set(CurrentInstanceTest.class, this);
Assert.assertNotNull(CurrentInstance.get(CurrentInstanceTest.class));
Callable<Void> runnable = () -> {
Assert.assertNull(CurrentInstance.get(CurrentInstanceTest.class));
return null;
};
ExecutorService service = Executors.newSingleThreadExecutor();
Future<Void> future = service.submit(runnable);
future.get();
}
}
|
