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 |
jsr166 |
1.22 |
import java.util.Arrays; |
10 |
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import java.util.concurrent.atomic.AtomicIntegerArray; |
11 |
dl |
1.1 |
|
12 |
jsr166 |
1.29 |
import junit.framework.Test; |
13 |
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import junit.framework.TestSuite; |
14 |
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15 |
dl |
1.3 |
public class AtomicIntegerArrayTest extends JSR166TestCase { |
16 |
dl |
1.1 |
|
17 |
jsr166 |
1.17 |
public static void main(String[] args) { |
18 |
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junit.textui.TestRunner.run(suite()); |
19 |
dl |
1.1 |
} |
20 |
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public static Test suite() { |
21 |
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return new TestSuite(AtomicIntegerArrayTest.class); |
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} |
23 |
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24 |
dl |
1.4 |
/** |
25 |
dl |
1.5 |
* constructor creates array of given size with all elements zero |
26 |
dl |
1.4 |
*/ |
27 |
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public void testConstructor() { |
28 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
29 |
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for (int i = 0; i < SIZE; i++) |
30 |
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assertEquals(0, aa.get(i)); |
31 |
dl |
1.1 |
} |
32 |
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33 |
dl |
1.4 |
/** |
34 |
dl |
1.7 |
* constructor with null array throws NPE |
35 |
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*/ |
36 |
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public void testConstructor2NPE() { |
37 |
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try { |
38 |
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int[] a = null; |
39 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(a); |
40 |
jsr166 |
1.14 |
shouldThrow(); |
41 |
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} catch (NullPointerException success) {} |
42 |
dl |
1.7 |
} |
43 |
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44 |
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/** |
45 |
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* constructor with array is of same size and has all elements |
46 |
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*/ |
47 |
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public void testConstructor2() { |
48 |
jsr166 |
1.23 |
int[] a = { 17, 3, -42, 99, -7 }; |
49 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(a); |
50 |
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assertEquals(a.length, aa.length()); |
51 |
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for (int i = 0; i < a.length; i++) |
52 |
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assertEquals(a[i], aa.get(i)); |
53 |
dl |
1.7 |
} |
54 |
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55 |
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/** |
56 |
dl |
1.5 |
* get and set for out of bound indices throw IndexOutOfBoundsException |
57 |
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*/ |
58 |
jsr166 |
1.13 |
public void testIndexing() { |
59 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
60 |
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for (int index : new int[] { -1, SIZE }) { |
61 |
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try { |
62 |
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aa.get(index); |
63 |
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shouldThrow(); |
64 |
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} catch (IndexOutOfBoundsException success) {} |
65 |
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try { |
66 |
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aa.set(index, 1); |
67 |
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shouldThrow(); |
68 |
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} catch (IndexOutOfBoundsException success) {} |
69 |
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try { |
70 |
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aa.lazySet(index, 1); |
71 |
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shouldThrow(); |
72 |
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} catch (IndexOutOfBoundsException success) {} |
73 |
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try { |
74 |
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aa.compareAndSet(index, 1, 2); |
75 |
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shouldThrow(); |
76 |
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} catch (IndexOutOfBoundsException success) {} |
77 |
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try { |
78 |
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aa.weakCompareAndSet(index, 1, 2); |
79 |
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shouldThrow(); |
80 |
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} catch (IndexOutOfBoundsException success) {} |
81 |
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try { |
82 |
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aa.getAndAdd(index, 1); |
83 |
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shouldThrow(); |
84 |
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} catch (IndexOutOfBoundsException success) {} |
85 |
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try { |
86 |
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aa.addAndGet(index, 1); |
87 |
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shouldThrow(); |
88 |
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} catch (IndexOutOfBoundsException success) {} |
89 |
dl |
1.5 |
} |
90 |
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} |
91 |
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92 |
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/** |
93 |
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* get returns the last value set at index |
94 |
dl |
1.4 |
*/ |
95 |
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public void testGetSet() { |
96 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
97 |
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for (int i = 0; i < SIZE; i++) { |
98 |
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aa.set(i, 1); |
99 |
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assertEquals(1, aa.get(i)); |
100 |
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aa.set(i, 2); |
101 |
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assertEquals(2, aa.get(i)); |
102 |
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aa.set(i, -3); |
103 |
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assertEquals(-3, aa.get(i)); |
104 |
dl |
1.1 |
} |
105 |
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} |
106 |
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107 |
dl |
1.4 |
/** |
108 |
dl |
1.10 |
* get returns the last value lazySet at index by same thread |
109 |
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*/ |
110 |
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public void testGetLazySet() { |
111 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
112 |
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for (int i = 0; i < SIZE; i++) { |
113 |
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aa.lazySet(i, 1); |
114 |
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assertEquals(1, aa.get(i)); |
115 |
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aa.lazySet(i, 2); |
116 |
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assertEquals(2, aa.get(i)); |
117 |
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aa.lazySet(i, -3); |
118 |
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assertEquals(-3, aa.get(i)); |
119 |
dl |
1.10 |
} |
120 |
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} |
121 |
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122 |
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/** |
123 |
dl |
1.5 |
* compareAndSet succeeds in changing value if equal to expected else fails |
124 |
dl |
1.4 |
*/ |
125 |
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public void testCompareAndSet() { |
126 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
127 |
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for (int i = 0; i < SIZE; i++) { |
128 |
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aa.set(i, 1); |
129 |
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assertTrue(aa.compareAndSet(i, 1, 2)); |
130 |
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assertTrue(aa.compareAndSet(i, 2, -4)); |
131 |
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assertEquals(-4, aa.get(i)); |
132 |
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assertFalse(aa.compareAndSet(i, -5, 7)); |
133 |
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assertEquals(-4, aa.get(i)); |
134 |
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assertTrue(aa.compareAndSet(i, -4, 7)); |
135 |
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assertEquals(7, aa.get(i)); |
136 |
dl |
1.1 |
} |
137 |
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} |
138 |
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|
139 |
dl |
1.4 |
/** |
140 |
dl |
1.5 |
* compareAndSet in one thread enables another waiting for value |
141 |
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* to succeed |
142 |
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*/ |
143 |
jsr166 |
1.14 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
144 |
dl |
1.5 |
final AtomicIntegerArray a = new AtomicIntegerArray(1); |
145 |
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a.set(0, 1); |
146 |
jsr166 |
1.15 |
Thread t = new Thread(new CheckedRunnable() { |
147 |
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public void realRun() { |
148 |
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while (!a.compareAndSet(0, 2, 3)) |
149 |
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Thread.yield(); |
150 |
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}}); |
151 |
jsr166 |
1.14 |
|
152 |
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t.start(); |
153 |
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assertTrue(a.compareAndSet(0, 1, 2)); |
154 |
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t.join(LONG_DELAY_MS); |
155 |
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assertFalse(t.isAlive()); |
156 |
jsr166 |
1.25 |
assertEquals(3, a.get(0)); |
157 |
dl |
1.5 |
} |
158 |
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|
159 |
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/** |
160 |
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* repeated weakCompareAndSet succeeds in changing value when equal |
161 |
jsr166 |
1.11 |
* to expected |
162 |
dl |
1.4 |
*/ |
163 |
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public void testWeakCompareAndSet() { |
164 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
165 |
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for (int i = 0; i < SIZE; i++) { |
166 |
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aa.set(i, 1); |
167 |
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while (!aa.weakCompareAndSet(i, 1, 2)); |
168 |
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while (!aa.weakCompareAndSet(i, 2, -4)); |
169 |
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assertEquals(-4, aa.get(i)); |
170 |
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while (!aa.weakCompareAndSet(i, -4, 7)); |
171 |
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assertEquals(7, aa.get(i)); |
172 |
dl |
1.1 |
} |
173 |
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} |
174 |
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|
175 |
dl |
1.4 |
/** |
176 |
jsr166 |
1.19 |
* getAndSet returns previous value and sets to given value at given index |
177 |
dl |
1.4 |
*/ |
178 |
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public void testGetAndSet() { |
179 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
180 |
|
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for (int i = 0; i < SIZE; i++) { |
181 |
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aa.set(i, 1); |
182 |
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assertEquals(1, aa.getAndSet(i, 0)); |
183 |
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assertEquals(0, aa.getAndSet(i, -10)); |
184 |
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assertEquals(-10, aa.getAndSet(i, 1)); |
185 |
dl |
1.1 |
} |
186 |
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} |
187 |
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|
188 |
dl |
1.4 |
/** |
189 |
jsr166 |
1.19 |
* getAndAdd returns previous value and adds given value |
190 |
dl |
1.4 |
*/ |
191 |
|
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public void testGetAndAdd() { |
192 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
193 |
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for (int i = 0; i < SIZE; i++) { |
194 |
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aa.set(i, 1); |
195 |
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assertEquals(1, aa.getAndAdd(i, 2)); |
196 |
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assertEquals(3, aa.get(i)); |
197 |
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assertEquals(3, aa.getAndAdd(i, -4)); |
198 |
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assertEquals(-1, aa.get(i)); |
199 |
dl |
1.1 |
} |
200 |
|
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} |
201 |
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|
202 |
dl |
1.4 |
/** |
203 |
dl |
1.5 |
* getAndDecrement returns previous value and decrements |
204 |
dl |
1.4 |
*/ |
205 |
|
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public void testGetAndDecrement() { |
206 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
207 |
|
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for (int i = 0; i < SIZE; i++) { |
208 |
|
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aa.set(i, 1); |
209 |
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assertEquals(1, aa.getAndDecrement(i)); |
210 |
|
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assertEquals(0, aa.getAndDecrement(i)); |
211 |
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assertEquals(-1, aa.getAndDecrement(i)); |
212 |
dl |
1.1 |
} |
213 |
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} |
214 |
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|
215 |
dl |
1.4 |
/** |
216 |
dl |
1.5 |
* getAndIncrement returns previous value and increments |
217 |
dl |
1.4 |
*/ |
218 |
|
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public void testGetAndIncrement() { |
219 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
220 |
|
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for (int i = 0; i < SIZE; i++) { |
221 |
|
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aa.set(i, 1); |
222 |
|
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assertEquals(1, aa.getAndIncrement(i)); |
223 |
|
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assertEquals(2, aa.get(i)); |
224 |
|
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aa.set(i, -2); |
225 |
|
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assertEquals(-2, aa.getAndIncrement(i)); |
226 |
|
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assertEquals(-1, aa.getAndIncrement(i)); |
227 |
|
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assertEquals(0, aa.getAndIncrement(i)); |
228 |
|
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assertEquals(1, aa.get(i)); |
229 |
dl |
1.1 |
} |
230 |
|
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} |
231 |
|
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|
232 |
dl |
1.4 |
/** |
233 |
jsr166 |
1.19 |
* addAndGet adds given value to current, and returns current value |
234 |
dl |
1.4 |
*/ |
235 |
dl |
1.1 |
public void testAddAndGet() { |
236 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
237 |
|
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for (int i = 0; i < SIZE; i++) { |
238 |
|
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aa.set(i, 1); |
239 |
|
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assertEquals(3, aa.addAndGet(i, 2)); |
240 |
|
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assertEquals(3, aa.get(i)); |
241 |
|
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assertEquals(-1, aa.addAndGet(i, -4)); |
242 |
|
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assertEquals(-1, aa.get(i)); |
243 |
dl |
1.1 |
} |
244 |
|
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} |
245 |
|
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|
246 |
dl |
1.4 |
/** |
247 |
dl |
1.5 |
* decrementAndGet decrements and returns current value |
248 |
dl |
1.4 |
*/ |
249 |
|
|
public void testDecrementAndGet() { |
250 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
251 |
|
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for (int i = 0; i < SIZE; i++) { |
252 |
|
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aa.set(i, 1); |
253 |
|
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assertEquals(0, aa.decrementAndGet(i)); |
254 |
|
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assertEquals(-1, aa.decrementAndGet(i)); |
255 |
|
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assertEquals(-2, aa.decrementAndGet(i)); |
256 |
|
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assertEquals(-2, aa.get(i)); |
257 |
dl |
1.1 |
} |
258 |
|
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} |
259 |
|
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|
260 |
dl |
1.4 |
/** |
261 |
jsr166 |
1.19 |
* incrementAndGet increments and returns current value |
262 |
dl |
1.4 |
*/ |
263 |
dl |
1.1 |
public void testIncrementAndGet() { |
264 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
265 |
|
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for (int i = 0; i < SIZE; i++) { |
266 |
|
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aa.set(i, 1); |
267 |
|
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assertEquals(2, aa.incrementAndGet(i)); |
268 |
|
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assertEquals(2, aa.get(i)); |
269 |
|
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aa.set(i, -2); |
270 |
|
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assertEquals(-1, aa.incrementAndGet(i)); |
271 |
|
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assertEquals(0, aa.incrementAndGet(i)); |
272 |
|
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assertEquals(1, aa.incrementAndGet(i)); |
273 |
|
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assertEquals(1, aa.get(i)); |
274 |
dl |
1.2 |
} |
275 |
|
|
} |
276 |
|
|
|
277 |
jsr166 |
1.18 |
class Counter extends CheckedRunnable { |
278 |
jsr166 |
1.26 |
final AtomicIntegerArray aa; |
279 |
dl |
1.3 |
volatile int counts; |
280 |
jsr166 |
1.26 |
Counter(AtomicIntegerArray a) { aa = a; } |
281 |
jsr166 |
1.18 |
public void realRun() { |
282 |
dl |
1.3 |
for (;;) { |
283 |
|
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boolean done = true; |
284 |
jsr166 |
1.26 |
for (int i = 0; i < aa.length(); i++) { |
285 |
|
|
int v = aa.get(i); |
286 |
jsr166 |
1.18 |
assertTrue(v >= 0); |
287 |
dl |
1.3 |
if (v != 0) { |
288 |
|
|
done = false; |
289 |
jsr166 |
1.26 |
if (aa.compareAndSet(i, v, v-1)) |
290 |
dl |
1.3 |
++counts; |
291 |
|
|
} |
292 |
|
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} |
293 |
|
|
if (done) |
294 |
|
|
break; |
295 |
|
|
} |
296 |
|
|
} |
297 |
|
|
} |
298 |
|
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|
299 |
dl |
1.4 |
/** |
300 |
dl |
1.5 |
* Multiple threads using same array of counters successfully |
301 |
|
|
* update a number of times equal to total count |
302 |
dl |
1.4 |
*/ |
303 |
jsr166 |
1.14 |
public void testCountingInMultipleThreads() throws InterruptedException { |
304 |
jsr166 |
1.26 |
final AtomicIntegerArray aa = new AtomicIntegerArray(SIZE); |
305 |
jsr166 |
1.28 |
int countdown = 10000; |
306 |
jsr166 |
1.26 |
for (int i = 0; i < SIZE; i++) |
307 |
jsr166 |
1.28 |
aa.set(i, countdown); |
308 |
jsr166 |
1.26 |
Counter c1 = new Counter(aa); |
309 |
|
|
Counter c2 = new Counter(aa); |
310 |
jsr166 |
1.14 |
Thread t1 = new Thread(c1); |
311 |
|
|
Thread t2 = new Thread(c2); |
312 |
|
|
t1.start(); |
313 |
|
|
t2.start(); |
314 |
|
|
t1.join(); |
315 |
|
|
t2.join(); |
316 |
jsr166 |
1.28 |
assertEquals(c1.counts+c2.counts, SIZE * countdown); |
317 |
dl |
1.3 |
} |
318 |
|
|
|
319 |
dl |
1.4 |
/** |
320 |
dl |
1.5 |
* a deserialized serialized array holds same values |
321 |
dl |
1.4 |
*/ |
322 |
jsr166 |
1.14 |
public void testSerialization() throws Exception { |
323 |
jsr166 |
1.22 |
AtomicIntegerArray x = new AtomicIntegerArray(SIZE); |
324 |
|
|
for (int i = 0; i < SIZE; i++) |
325 |
|
|
x.set(i, -i); |
326 |
|
|
AtomicIntegerArray y = serialClone(x); |
327 |
jsr166 |
1.27 |
assertNotSame(x, y); |
328 |
jsr166 |
1.22 |
assertEquals(x.length(), y.length()); |
329 |
|
|
for (int i = 0; i < SIZE; i++) { |
330 |
|
|
assertEquals(x.get(i), y.get(i)); |
331 |
dl |
1.1 |
} |
332 |
|
|
} |
333 |
|
|
|
334 |
dl |
1.9 |
/** |
335 |
|
|
* toString returns current value. |
336 |
jsr166 |
1.11 |
*/ |
337 |
dl |
1.9 |
public void testToString() { |
338 |
jsr166 |
1.23 |
int[] a = { 17, 3, -42, 99, -7 }; |
339 |
jsr166 |
1.26 |
AtomicIntegerArray aa = new AtomicIntegerArray(a); |
340 |
|
|
assertEquals(Arrays.toString(a), aa.toString()); |
341 |
dl |
1.9 |
} |
342 |
dl |
1.8 |
|
343 |
dl |
1.1 |
} |