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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
* Other contributors include Andrew Wright, Jeffrey Hayes,
* Pat Fisher, Mike Judd.
*/
package jsr166;
import java.util.Arrays;
import java.util.concurrent.atomic.AtomicReferenceArray;
import junit.framework.Test;
import junit.framework.TestSuite;
public class AtomicReferenceArrayTest extends JSR166TestCase {
// android-note: Removed because the CTS runner does a bad job of
// retrying tests that have suite() declarations.
//
// public static void main(String[] args) {
// main(suite(), args);
// }
// public static Test suite() {
// return new TestSuite(...);
// }
/**
* constructor creates array of given size with all elements null
*/
public void testConstructor() {
AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(SIZE);
for (int i = 0; i < SIZE; i++) {
assertNull(aa.get(i));
}
}
/**
* constructor with null array throws NPE
*/
public void testConstructor2NPE() {
try {
Integer[] a = null;
new AtomicReferenceArray<Integer>(a);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* constructor with array is of same size and has all elements
*/
public void testConstructor2() {
Integer[] a = { two, one, three, four, seven };
AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(a);
assertEquals(a.length, aa.length());
for (int i = 0; i < a.length; i++)
assertEquals(a[i], aa.get(i));
}
/**
* Initialize AtomicReferenceArray<Class> with SubClass[]
*/
public void testConstructorSubClassArray() {
Integer[] a = { two, one, three, four, seven };
AtomicReferenceArray<Number> aa = new AtomicReferenceArray<Number>(a);
assertEquals(a.length, aa.length());
for (int i = 0; i < a.length; i++) {
assertSame(a[i], aa.get(i));
Long x = Long.valueOf(i);
aa.set(i, x);
assertSame(x, aa.get(i));
}
}
/**
* get and set for out of bound indices throw IndexOutOfBoundsException
*/
public void testIndexing() {
AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(SIZE);
for (int index : new int[] { -1, SIZE }) {
try {
aa.get(index);
shouldThrow();
} catch (IndexOutOfBoundsException success) {}
try {
aa.set(index, null);
shouldThrow();
} catch (IndexOutOfBoundsException success) {}
try {
aa.lazySet(index, null);
shouldThrow();
} catch (IndexOutOfBoundsException success) {}
try {
aa.compareAndSet(index, null, null);
shouldThrow();
} catch (IndexOutOfBoundsException success) {}
try {
aa.weakCompareAndSet(index, null, null);
shouldThrow();
} catch (IndexOutOfBoundsException success) {}
}
}
/**
* get returns the last value set at index
*/
public void testGetSet() {
AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
for (int i = 0; i < SIZE; i++) {
aa.set(i, one);
assertSame(one, aa.get(i));
aa.set(i, two);
assertSame(two, aa.get(i));
aa.set(i, m3);
assertSame(m3, aa.get(i));
}
}
/**
* get returns the last value lazySet at index by same thread
*/
public void testGetLazySet() {
AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
for (int i = 0; i < SIZE; i++) {
aa.lazySet(i, one);
assertSame(one, aa.get(i));
aa.lazySet(i, two);
assertSame(two, aa.get(i));
aa.lazySet(i, m3);
assertSame(m3, aa.get(i));
}
}
/**
* compareAndSet succeeds in changing value if equal to expected else fails
*/
public void testCompareAndSet() {
AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
for (int i = 0; i < SIZE; i++) {
aa.set(i, one);
assertTrue(aa.compareAndSet(i, one, two));
assertTrue(aa.compareAndSet(i, two, m4));
assertSame(m4, aa.get(i));
assertFalse(aa.compareAndSet(i, m5, seven));
assertSame(m4, aa.get(i));
assertTrue(aa.compareAndSet(i, m4, seven));
assertSame(seven, aa.get(i));
}
}
/**
* compareAndSet in one thread enables another waiting for value
* to succeed
*/
public void testCompareAndSetInMultipleThreads() throws InterruptedException {
final AtomicReferenceArray a = new AtomicReferenceArray(1);
a.set(0, one);
Thread t = new Thread(new CheckedRunnable() {
public void realRun() {
while (!a.compareAndSet(0, two, three))
Thread.yield();
}});
t.start();
assertTrue(a.compareAndSet(0, one, two));
t.join(LONG_DELAY_MS);
assertFalse(t.isAlive());
assertSame(three, a.get(0));
}
/**
* repeated weakCompareAndSet succeeds in changing value when equal
* to expected
*/
public void testWeakCompareAndSet() {
AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
for (int i = 0; i < SIZE; i++) {
aa.set(i, one);
do {} while (!aa.weakCompareAndSet(i, one, two));
do {} while (!aa.weakCompareAndSet(i, two, m4));
assertSame(m4, aa.get(i));
do {} while (!aa.weakCompareAndSet(i, m4, seven));
assertSame(seven, aa.get(i));
}
}
/**
* getAndSet returns previous value and sets to given value at given index
*/
public void testGetAndSet() {
AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
for (int i = 0; i < SIZE; i++) {
aa.set(i, one);
assertSame(one, aa.getAndSet(i, zero));
assertSame(zero, aa.getAndSet(i, m10));
assertSame(m10, aa.getAndSet(i, one));
}
}
/**
* a deserialized serialized array holds same values
*/
public void testSerialization() throws Exception {
AtomicReferenceArray x = new AtomicReferenceArray(SIZE);
for (int i = 0; i < SIZE; i++) {
x.set(i, new Integer(-i));
}
AtomicReferenceArray y = serialClone(x);
assertNotSame(x, y);
assertEquals(x.length(), y.length());
for (int i = 0; i < SIZE; i++) {
assertEquals(x.get(i), y.get(i));
}
}
/**
* toString returns current value.
*/
public void testToString() {
Integer[] a = { two, one, three, four, seven };
AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(a);
assertEquals(Arrays.toString(a), aa.toString());
}
}
|
