1 |
dl |
1.1 |
/* |
2 |
dl |
1.6 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
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* Expert Group and released to the public domain, as explained at |
4 |
jsr166 |
1.20 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
jsr166 |
1.11 |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
6 |
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* Pat Fisher, Mike Judd. |
7 |
dl |
1.1 |
*/ |
8 |
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9 |
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import junit.framework.*; |
10 |
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import java.util.concurrent.atomic.*; |
11 |
dl |
1.2 |
import java.io.*; |
12 |
dl |
1.9 |
import java.util.*; |
13 |
dl |
1.1 |
|
14 |
dl |
1.3 |
public class AtomicIntegerArrayTest extends JSR166TestCase { |
15 |
dl |
1.1 |
|
16 |
jsr166 |
1.17 |
public static void main(String[] args) { |
17 |
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junit.textui.TestRunner.run(suite()); |
18 |
dl |
1.1 |
} |
19 |
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public static Test suite() { |
20 |
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return new TestSuite(AtomicIntegerArrayTest.class); |
21 |
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} |
22 |
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23 |
dl |
1.4 |
/** |
24 |
dl |
1.5 |
* constructor creates array of given size with all elements zero |
25 |
dl |
1.4 |
*/ |
26 |
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public void testConstructor() { |
27 |
dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
28 |
jsr166 |
1.11 |
for (int i = 0; i < SIZE; ++i) |
29 |
dl |
1.1 |
assertEquals(0,ai.get(i)); |
30 |
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} |
31 |
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32 |
dl |
1.4 |
/** |
33 |
dl |
1.7 |
* constructor with null array throws NPE |
34 |
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*/ |
35 |
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public void testConstructor2NPE() { |
36 |
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try { |
37 |
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int[] a = null; |
38 |
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AtomicIntegerArray ai = new AtomicIntegerArray(a); |
39 |
jsr166 |
1.14 |
shouldThrow(); |
40 |
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} catch (NullPointerException success) {} |
41 |
dl |
1.7 |
} |
42 |
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43 |
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/** |
44 |
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* constructor with array is of same size and has all elements |
45 |
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*/ |
46 |
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public void testConstructor2() { |
47 |
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int[] a = { 17, 3, -42, 99, -7}; |
48 |
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AtomicIntegerArray ai = new AtomicIntegerArray(a); |
49 |
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assertEquals(a.length, ai.length()); |
50 |
jsr166 |
1.11 |
for (int i = 0; i < a.length; ++i) |
51 |
dl |
1.7 |
assertEquals(a[i], ai.get(i)); |
52 |
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} |
53 |
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54 |
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/** |
55 |
dl |
1.5 |
* get and set for out of bound indices throw IndexOutOfBoundsException |
56 |
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*/ |
57 |
jsr166 |
1.13 |
public void testIndexing() { |
58 |
dl |
1.5 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
59 |
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try { |
60 |
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ai.get(SIZE); |
61 |
jsr166 |
1.14 |
shouldThrow(); |
62 |
jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
63 |
dl |
1.5 |
} |
64 |
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try { |
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ai.get(-1); |
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jsr166 |
1.14 |
shouldThrow(); |
67 |
jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
68 |
dl |
1.5 |
} |
69 |
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try { |
70 |
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ai.set(SIZE, 0); |
71 |
jsr166 |
1.14 |
shouldThrow(); |
72 |
jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
73 |
dl |
1.5 |
} |
74 |
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try { |
75 |
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ai.set(-1, 0); |
76 |
jsr166 |
1.14 |
shouldThrow(); |
77 |
jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
78 |
dl |
1.5 |
} |
79 |
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} |
80 |
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81 |
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/** |
82 |
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* get returns the last value set at index |
83 |
dl |
1.4 |
*/ |
84 |
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public void testGetSet() { |
85 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
86 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
87 |
dl |
1.1 |
ai.set(i, 1); |
88 |
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assertEquals(1,ai.get(i)); |
89 |
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ai.set(i, 2); |
90 |
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assertEquals(2,ai.get(i)); |
91 |
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ai.set(i, -3); |
92 |
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assertEquals(-3,ai.get(i)); |
93 |
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} |
94 |
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} |
95 |
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96 |
dl |
1.4 |
/** |
97 |
dl |
1.10 |
* get returns the last value lazySet at index by same thread |
98 |
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*/ |
99 |
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public void testGetLazySet() { |
100 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
101 |
dl |
1.10 |
for (int i = 0; i < SIZE; ++i) { |
102 |
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ai.lazySet(i, 1); |
103 |
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assertEquals(1,ai.get(i)); |
104 |
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ai.lazySet(i, 2); |
105 |
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assertEquals(2,ai.get(i)); |
106 |
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ai.lazySet(i, -3); |
107 |
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assertEquals(-3,ai.get(i)); |
108 |
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} |
109 |
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} |
110 |
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111 |
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/** |
112 |
dl |
1.5 |
* compareAndSet succeeds in changing value if equal to expected else fails |
113 |
dl |
1.4 |
*/ |
114 |
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public void testCompareAndSet() { |
115 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
116 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
117 |
dl |
1.1 |
ai.set(i, 1); |
118 |
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assertTrue(ai.compareAndSet(i, 1,2)); |
119 |
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assertTrue(ai.compareAndSet(i, 2,-4)); |
120 |
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assertEquals(-4,ai.get(i)); |
121 |
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assertFalse(ai.compareAndSet(i, -5,7)); |
122 |
jsr166 |
1.16 |
assertEquals(-4,ai.get(i)); |
123 |
dl |
1.1 |
assertTrue(ai.compareAndSet(i, -4,7)); |
124 |
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assertEquals(7,ai.get(i)); |
125 |
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} |
126 |
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} |
127 |
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128 |
dl |
1.4 |
/** |
129 |
dl |
1.5 |
* compareAndSet in one thread enables another waiting for value |
130 |
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* to succeed |
131 |
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*/ |
132 |
jsr166 |
1.14 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
133 |
dl |
1.5 |
final AtomicIntegerArray a = new AtomicIntegerArray(1); |
134 |
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a.set(0, 1); |
135 |
jsr166 |
1.15 |
Thread t = new Thread(new CheckedRunnable() { |
136 |
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public void realRun() { |
137 |
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while (!a.compareAndSet(0, 2, 3)) |
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Thread.yield(); |
139 |
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}}); |
140 |
jsr166 |
1.14 |
|
141 |
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t.start(); |
142 |
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assertTrue(a.compareAndSet(0, 1, 2)); |
143 |
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t.join(LONG_DELAY_MS); |
144 |
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assertFalse(t.isAlive()); |
145 |
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assertEquals(a.get(0), 3); |
146 |
dl |
1.5 |
} |
147 |
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148 |
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/** |
149 |
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* repeated weakCompareAndSet succeeds in changing value when equal |
150 |
jsr166 |
1.11 |
* to expected |
151 |
dl |
1.4 |
*/ |
152 |
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public void testWeakCompareAndSet() { |
153 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
154 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
155 |
dl |
1.1 |
ai.set(i, 1); |
156 |
jsr166 |
1.12 |
while (!ai.weakCompareAndSet(i, 1,2)); |
157 |
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while (!ai.weakCompareAndSet(i, 2,-4)); |
158 |
dl |
1.1 |
assertEquals(-4,ai.get(i)); |
159 |
jsr166 |
1.12 |
while (!ai.weakCompareAndSet(i, -4,7)); |
160 |
dl |
1.1 |
assertEquals(7,ai.get(i)); |
161 |
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} |
162 |
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} |
163 |
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|
164 |
dl |
1.4 |
/** |
165 |
jsr166 |
1.19 |
* getAndSet returns previous value and sets to given value at given index |
166 |
dl |
1.4 |
*/ |
167 |
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public void testGetAndSet() { |
168 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
169 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
170 |
dl |
1.1 |
ai.set(i, 1); |
171 |
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assertEquals(1,ai.getAndSet(i,0)); |
172 |
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assertEquals(0,ai.getAndSet(i,-10)); |
173 |
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assertEquals(-10,ai.getAndSet(i,1)); |
174 |
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} |
175 |
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} |
176 |
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177 |
dl |
1.4 |
/** |
178 |
jsr166 |
1.19 |
* getAndAdd returns previous value and adds given value |
179 |
dl |
1.4 |
*/ |
180 |
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public void testGetAndAdd() { |
181 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
182 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
183 |
dl |
1.1 |
ai.set(i, 1); |
184 |
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assertEquals(1,ai.getAndAdd(i,2)); |
185 |
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assertEquals(3,ai.get(i)); |
186 |
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assertEquals(3,ai.getAndAdd(i,-4)); |
187 |
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assertEquals(-1,ai.get(i)); |
188 |
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} |
189 |
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} |
190 |
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191 |
dl |
1.4 |
/** |
192 |
dl |
1.5 |
* getAndDecrement returns previous value and decrements |
193 |
dl |
1.4 |
*/ |
194 |
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public void testGetAndDecrement() { |
195 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
196 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
197 |
dl |
1.1 |
ai.set(i, 1); |
198 |
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assertEquals(1,ai.getAndDecrement(i)); |
199 |
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assertEquals(0,ai.getAndDecrement(i)); |
200 |
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assertEquals(-1,ai.getAndDecrement(i)); |
201 |
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} |
202 |
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} |
203 |
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|
204 |
dl |
1.4 |
/** |
205 |
dl |
1.5 |
* getAndIncrement returns previous value and increments |
206 |
dl |
1.4 |
*/ |
207 |
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public void testGetAndIncrement() { |
208 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
209 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
210 |
dl |
1.1 |
ai.set(i, 1); |
211 |
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assertEquals(1,ai.getAndIncrement(i)); |
212 |
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assertEquals(2,ai.get(i)); |
213 |
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ai.set(i,-2); |
214 |
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assertEquals(-2,ai.getAndIncrement(i)); |
215 |
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assertEquals(-1,ai.getAndIncrement(i)); |
216 |
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assertEquals(0,ai.getAndIncrement(i)); |
217 |
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assertEquals(1,ai.get(i)); |
218 |
|
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} |
219 |
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} |
220 |
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|
221 |
dl |
1.4 |
/** |
222 |
jsr166 |
1.19 |
* addAndGet adds given value to current, and returns current value |
223 |
dl |
1.4 |
*/ |
224 |
dl |
1.1 |
public void testAddAndGet() { |
225 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
226 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
227 |
dl |
1.1 |
ai.set(i, 1); |
228 |
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assertEquals(3,ai.addAndGet(i,2)); |
229 |
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assertEquals(3,ai.get(i)); |
230 |
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assertEquals(-1,ai.addAndGet(i,-4)); |
231 |
|
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assertEquals(-1,ai.get(i)); |
232 |
|
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} |
233 |
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} |
234 |
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|
235 |
dl |
1.4 |
/** |
236 |
dl |
1.5 |
* decrementAndGet decrements and returns current value |
237 |
dl |
1.4 |
*/ |
238 |
|
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public void testDecrementAndGet() { |
239 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
240 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
241 |
dl |
1.1 |
ai.set(i, 1); |
242 |
|
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assertEquals(0,ai.decrementAndGet(i)); |
243 |
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assertEquals(-1,ai.decrementAndGet(i)); |
244 |
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assertEquals(-2,ai.decrementAndGet(i)); |
245 |
|
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assertEquals(-2,ai.get(i)); |
246 |
|
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} |
247 |
|
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} |
248 |
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|
249 |
dl |
1.4 |
/** |
250 |
jsr166 |
1.19 |
* incrementAndGet increments and returns current value |
251 |
dl |
1.4 |
*/ |
252 |
dl |
1.1 |
public void testIncrementAndGet() { |
253 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
254 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
255 |
dl |
1.1 |
ai.set(i, 1); |
256 |
|
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assertEquals(2,ai.incrementAndGet(i)); |
257 |
|
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assertEquals(2,ai.get(i)); |
258 |
|
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ai.set(i, -2); |
259 |
|
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assertEquals(-1,ai.incrementAndGet(i)); |
260 |
|
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assertEquals(0,ai.incrementAndGet(i)); |
261 |
|
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assertEquals(1,ai.incrementAndGet(i)); |
262 |
|
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assertEquals(1,ai.get(i)); |
263 |
dl |
1.2 |
} |
264 |
|
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} |
265 |
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|
266 |
dl |
1.3 |
static final int COUNTDOWN = 100000; |
267 |
jsr166 |
1.11 |
|
268 |
jsr166 |
1.18 |
class Counter extends CheckedRunnable { |
269 |
dl |
1.3 |
final AtomicIntegerArray ai; |
270 |
|
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volatile int counts; |
271 |
|
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Counter(AtomicIntegerArray a) { ai = a; } |
272 |
jsr166 |
1.18 |
public void realRun() { |
273 |
dl |
1.3 |
for (;;) { |
274 |
|
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boolean done = true; |
275 |
|
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for (int i = 0; i < ai.length(); ++i) { |
276 |
|
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int v = ai.get(i); |
277 |
jsr166 |
1.18 |
assertTrue(v >= 0); |
278 |
dl |
1.3 |
if (v != 0) { |
279 |
|
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done = false; |
280 |
|
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if (ai.compareAndSet(i, v, v-1)) |
281 |
|
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++counts; |
282 |
|
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} |
283 |
|
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} |
284 |
|
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if (done) |
285 |
|
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break; |
286 |
|
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} |
287 |
|
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} |
288 |
|
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} |
289 |
|
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|
290 |
dl |
1.4 |
/** |
291 |
dl |
1.5 |
* Multiple threads using same array of counters successfully |
292 |
|
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* update a number of times equal to total count |
293 |
dl |
1.4 |
*/ |
294 |
jsr166 |
1.14 |
public void testCountingInMultipleThreads() throws InterruptedException { |
295 |
|
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final AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
296 |
|
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for (int i = 0; i < SIZE; ++i) |
297 |
|
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ai.set(i, COUNTDOWN); |
298 |
|
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Counter c1 = new Counter(ai); |
299 |
|
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Counter c2 = new Counter(ai); |
300 |
|
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Thread t1 = new Thread(c1); |
301 |
|
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Thread t2 = new Thread(c2); |
302 |
|
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t1.start(); |
303 |
|
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t2.start(); |
304 |
|
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t1.join(); |
305 |
|
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t2.join(); |
306 |
|
|
assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN); |
307 |
dl |
1.3 |
} |
308 |
|
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|
309 |
dl |
1.4 |
/** |
310 |
dl |
1.5 |
* a deserialized serialized array holds same values |
311 |
dl |
1.4 |
*/ |
312 |
jsr166 |
1.14 |
public void testSerialization() throws Exception { |
313 |
jsr166 |
1.11 |
AtomicIntegerArray l = new AtomicIntegerArray(SIZE); |
314 |
|
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for (int i = 0; i < SIZE; ++i) |
315 |
dl |
1.2 |
l.set(i, -i); |
316 |
|
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|
317 |
jsr166 |
1.14 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
318 |
|
|
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
319 |
|
|
out.writeObject(l); |
320 |
|
|
out.close(); |
321 |
|
|
|
322 |
|
|
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
323 |
|
|
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
324 |
|
|
AtomicIntegerArray r = (AtomicIntegerArray) in.readObject(); |
325 |
|
|
for (int i = 0; i < SIZE; ++i) { |
326 |
|
|
assertEquals(l.get(i), r.get(i)); |
327 |
dl |
1.1 |
} |
328 |
|
|
} |
329 |
|
|
|
330 |
dl |
1.9 |
/** |
331 |
|
|
* toString returns current value. |
332 |
jsr166 |
1.11 |
*/ |
333 |
dl |
1.9 |
public void testToString() { |
334 |
|
|
int[] a = { 17, 3, -42, 99, -7}; |
335 |
|
|
AtomicIntegerArray ai = new AtomicIntegerArray(a); |
336 |
|
|
assertEquals(Arrays.toString(a), ai.toString()); |
337 |
|
|
} |
338 |
dl |
1.8 |
|
339 |
dl |
1.1 |
} |