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 |
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* http://creativecommons.org/licenses/publicdomain |
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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 |
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public static void main (String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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} |
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public static Test suite() { |
20 |
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return new TestSuite(AtomicIntegerArrayTest.class); |
21 |
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} |
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23 |
dl |
1.3 |
|
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 |
dl |
1.3 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
29 |
jsr166 |
1.11 |
for (int i = 0; i < SIZE; ++i) |
30 |
dl |
1.1 |
assertEquals(0,ai.get(i)); |
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} |
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 |
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AtomicIntegerArray ai = 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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*/ |
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public void testConstructor2() { |
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int[] a = { 17, 3, -42, 99, -7}; |
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AtomicIntegerArray ai = new AtomicIntegerArray(a); |
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assertEquals(a.length, ai.length()); |
51 |
jsr166 |
1.11 |
for (int i = 0; i < a.length; ++i) |
52 |
dl |
1.7 |
assertEquals(a[i], ai.get(i)); |
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} |
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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 |
dl |
1.5 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
60 |
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try { |
61 |
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ai.get(SIZE); |
62 |
jsr166 |
1.14 |
shouldThrow(); |
63 |
jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
64 |
dl |
1.5 |
} |
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try { |
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ai.get(-1); |
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jsr166 |
1.14 |
shouldThrow(); |
68 |
jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
69 |
dl |
1.5 |
} |
70 |
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try { |
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ai.set(SIZE, 0); |
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jsr166 |
1.14 |
shouldThrow(); |
73 |
jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
74 |
dl |
1.5 |
} |
75 |
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try { |
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ai.set(-1, 0); |
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jsr166 |
1.14 |
shouldThrow(); |
78 |
jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
79 |
dl |
1.5 |
} |
80 |
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} |
81 |
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/** |
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* get returns the last value set at index |
84 |
dl |
1.4 |
*/ |
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public void testGetSet() { |
86 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
87 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
88 |
dl |
1.1 |
ai.set(i, 1); |
89 |
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assertEquals(1,ai.get(i)); |
90 |
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ai.set(i, 2); |
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assertEquals(2,ai.get(i)); |
92 |
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ai.set(i, -3); |
93 |
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assertEquals(-3,ai.get(i)); |
94 |
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} |
95 |
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} |
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97 |
dl |
1.4 |
/** |
98 |
dl |
1.10 |
* get returns the last value lazySet at index by same thread |
99 |
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*/ |
100 |
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public void testGetLazySet() { |
101 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
102 |
dl |
1.10 |
for (int i = 0; i < SIZE; ++i) { |
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ai.lazySet(i, 1); |
104 |
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assertEquals(1,ai.get(i)); |
105 |
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ai.lazySet(i, 2); |
106 |
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assertEquals(2,ai.get(i)); |
107 |
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ai.lazySet(i, -3); |
108 |
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assertEquals(-3,ai.get(i)); |
109 |
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} |
110 |
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} |
111 |
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112 |
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/** |
113 |
dl |
1.5 |
* compareAndSet succeeds in changing value if equal to expected else fails |
114 |
dl |
1.4 |
*/ |
115 |
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public void testCompareAndSet() { |
116 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
117 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
118 |
dl |
1.1 |
ai.set(i, 1); |
119 |
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assertTrue(ai.compareAndSet(i, 1,2)); |
120 |
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assertTrue(ai.compareAndSet(i, 2,-4)); |
121 |
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assertEquals(-4,ai.get(i)); |
122 |
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assertFalse(ai.compareAndSet(i, -5,7)); |
123 |
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assertFalse((7 == ai.get(i))); |
124 |
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assertTrue(ai.compareAndSet(i, -4,7)); |
125 |
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assertEquals(7,ai.get(i)); |
126 |
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} |
127 |
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} |
128 |
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129 |
dl |
1.4 |
/** |
130 |
dl |
1.5 |
* compareAndSet in one thread enables another waiting for value |
131 |
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* to succeed |
132 |
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*/ |
133 |
jsr166 |
1.14 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
134 |
dl |
1.5 |
final AtomicIntegerArray a = new AtomicIntegerArray(1); |
135 |
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a.set(0, 1); |
136 |
jsr166 |
1.15 |
Thread t = new Thread(new CheckedRunnable() { |
137 |
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public void realRun() { |
138 |
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while (!a.compareAndSet(0, 2, 3)) |
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Thread.yield(); |
140 |
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}}); |
141 |
jsr166 |
1.14 |
|
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t.start(); |
143 |
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assertTrue(a.compareAndSet(0, 1, 2)); |
144 |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
146 |
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assertEquals(a.get(0), 3); |
147 |
dl |
1.5 |
} |
148 |
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149 |
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/** |
150 |
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* repeated weakCompareAndSet succeeds in changing value when equal |
151 |
jsr166 |
1.11 |
* to expected |
152 |
dl |
1.4 |
*/ |
153 |
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public void testWeakCompareAndSet() { |
154 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
155 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
156 |
dl |
1.1 |
ai.set(i, 1); |
157 |
jsr166 |
1.12 |
while (!ai.weakCompareAndSet(i, 1,2)); |
158 |
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while (!ai.weakCompareAndSet(i, 2,-4)); |
159 |
dl |
1.1 |
assertEquals(-4,ai.get(i)); |
160 |
jsr166 |
1.12 |
while (!ai.weakCompareAndSet(i, -4,7)); |
161 |
dl |
1.1 |
assertEquals(7,ai.get(i)); |
162 |
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} |
163 |
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} |
164 |
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|
165 |
dl |
1.4 |
/** |
166 |
dl |
1.5 |
* getAndSet returns previous value and sets to given value at given index |
167 |
dl |
1.4 |
*/ |
168 |
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public void testGetAndSet() { |
169 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
170 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
171 |
dl |
1.1 |
ai.set(i, 1); |
172 |
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assertEquals(1,ai.getAndSet(i,0)); |
173 |
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assertEquals(0,ai.getAndSet(i,-10)); |
174 |
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assertEquals(-10,ai.getAndSet(i,1)); |
175 |
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} |
176 |
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} |
177 |
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178 |
dl |
1.4 |
/** |
179 |
dl |
1.5 |
* getAndAdd returns previous value and adds given value |
180 |
dl |
1.4 |
*/ |
181 |
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public void testGetAndAdd() { |
182 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
183 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
184 |
dl |
1.1 |
ai.set(i, 1); |
185 |
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assertEquals(1,ai.getAndAdd(i,2)); |
186 |
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assertEquals(3,ai.get(i)); |
187 |
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assertEquals(3,ai.getAndAdd(i,-4)); |
188 |
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assertEquals(-1,ai.get(i)); |
189 |
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} |
190 |
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} |
191 |
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|
192 |
dl |
1.4 |
/** |
193 |
dl |
1.5 |
* getAndDecrement returns previous value and decrements |
194 |
dl |
1.4 |
*/ |
195 |
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public void testGetAndDecrement() { |
196 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
197 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
198 |
dl |
1.1 |
ai.set(i, 1); |
199 |
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assertEquals(1,ai.getAndDecrement(i)); |
200 |
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assertEquals(0,ai.getAndDecrement(i)); |
201 |
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assertEquals(-1,ai.getAndDecrement(i)); |
202 |
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} |
203 |
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} |
204 |
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205 |
dl |
1.4 |
/** |
206 |
dl |
1.5 |
* getAndIncrement returns previous value and increments |
207 |
dl |
1.4 |
*/ |
208 |
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public void testGetAndIncrement() { |
209 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
210 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
211 |
dl |
1.1 |
ai.set(i, 1); |
212 |
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assertEquals(1,ai.getAndIncrement(i)); |
213 |
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assertEquals(2,ai.get(i)); |
214 |
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ai.set(i,-2); |
215 |
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assertEquals(-2,ai.getAndIncrement(i)); |
216 |
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assertEquals(-1,ai.getAndIncrement(i)); |
217 |
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assertEquals(0,ai.getAndIncrement(i)); |
218 |
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assertEquals(1,ai.get(i)); |
219 |
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} |
220 |
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} |
221 |
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|
222 |
dl |
1.4 |
/** |
223 |
dl |
1.5 |
* addAndGet adds given value to current, and returns current value |
224 |
dl |
1.4 |
*/ |
225 |
dl |
1.1 |
public void testAddAndGet() { |
226 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
227 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
228 |
dl |
1.1 |
ai.set(i, 1); |
229 |
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assertEquals(3,ai.addAndGet(i,2)); |
230 |
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assertEquals(3,ai.get(i)); |
231 |
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assertEquals(-1,ai.addAndGet(i,-4)); |
232 |
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assertEquals(-1,ai.get(i)); |
233 |
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} |
234 |
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} |
235 |
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|
236 |
dl |
1.4 |
/** |
237 |
dl |
1.5 |
* decrementAndGet decrements and returns current value |
238 |
dl |
1.4 |
*/ |
239 |
|
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public void testDecrementAndGet() { |
240 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
241 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
242 |
dl |
1.1 |
ai.set(i, 1); |
243 |
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assertEquals(0,ai.decrementAndGet(i)); |
244 |
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assertEquals(-1,ai.decrementAndGet(i)); |
245 |
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assertEquals(-2,ai.decrementAndGet(i)); |
246 |
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assertEquals(-2,ai.get(i)); |
247 |
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} |
248 |
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} |
249 |
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|
250 |
dl |
1.4 |
/** |
251 |
dl |
1.5 |
* incrementAndGet increments and returns current value |
252 |
dl |
1.4 |
*/ |
253 |
dl |
1.1 |
public void testIncrementAndGet() { |
254 |
jsr166 |
1.11 |
AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
255 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
256 |
dl |
1.1 |
ai.set(i, 1); |
257 |
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assertEquals(2,ai.incrementAndGet(i)); |
258 |
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assertEquals(2,ai.get(i)); |
259 |
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ai.set(i, -2); |
260 |
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assertEquals(-1,ai.incrementAndGet(i)); |
261 |
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assertEquals(0,ai.incrementAndGet(i)); |
262 |
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assertEquals(1,ai.incrementAndGet(i)); |
263 |
|
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assertEquals(1,ai.get(i)); |
264 |
dl |
1.2 |
} |
265 |
|
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} |
266 |
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|
267 |
dl |
1.3 |
static final int COUNTDOWN = 100000; |
268 |
jsr166 |
1.11 |
|
269 |
dl |
1.3 |
class Counter implements Runnable { |
270 |
|
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final AtomicIntegerArray ai; |
271 |
|
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volatile int counts; |
272 |
|
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Counter(AtomicIntegerArray a) { ai = a; } |
273 |
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public void run() { |
274 |
|
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for (;;) { |
275 |
|
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boolean done = true; |
276 |
|
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for (int i = 0; i < ai.length(); ++i) { |
277 |
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int v = ai.get(i); |
278 |
|
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threadAssertTrue(v >= 0); |
279 |
|
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if (v != 0) { |
280 |
|
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done = false; |
281 |
|
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if (ai.compareAndSet(i, v, v-1)) |
282 |
|
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++counts; |
283 |
|
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} |
284 |
|
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} |
285 |
|
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if (done) |
286 |
|
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break; |
287 |
|
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} |
288 |
|
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} |
289 |
|
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} |
290 |
|
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|
291 |
dl |
1.4 |
/** |
292 |
dl |
1.5 |
* Multiple threads using same array of counters successfully |
293 |
|
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* update a number of times equal to total count |
294 |
dl |
1.4 |
*/ |
295 |
jsr166 |
1.14 |
public void testCountingInMultipleThreads() throws InterruptedException { |
296 |
|
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final AtomicIntegerArray ai = new AtomicIntegerArray(SIZE); |
297 |
|
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for (int i = 0; i < SIZE; ++i) |
298 |
|
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ai.set(i, COUNTDOWN); |
299 |
|
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Counter c1 = new Counter(ai); |
300 |
|
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Counter c2 = new Counter(ai); |
301 |
|
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Thread t1 = new Thread(c1); |
302 |
|
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Thread t2 = new Thread(c2); |
303 |
|
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t1.start(); |
304 |
|
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t2.start(); |
305 |
|
|
t1.join(); |
306 |
|
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t2.join(); |
307 |
|
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assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN); |
308 |
dl |
1.3 |
} |
309 |
|
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|
310 |
|
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|
311 |
dl |
1.4 |
/** |
312 |
dl |
1.5 |
* a deserialized serialized array holds same values |
313 |
dl |
1.4 |
*/ |
314 |
jsr166 |
1.14 |
public void testSerialization() throws Exception { |
315 |
jsr166 |
1.11 |
AtomicIntegerArray l = new AtomicIntegerArray(SIZE); |
316 |
|
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for (int i = 0; i < SIZE; ++i) |
317 |
dl |
1.2 |
l.set(i, -i); |
318 |
|
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|
319 |
jsr166 |
1.14 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
320 |
|
|
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
321 |
|
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out.writeObject(l); |
322 |
|
|
out.close(); |
323 |
|
|
|
324 |
|
|
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
325 |
|
|
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
326 |
|
|
AtomicIntegerArray r = (AtomicIntegerArray) in.readObject(); |
327 |
|
|
for (int i = 0; i < SIZE; ++i) { |
328 |
|
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assertEquals(l.get(i), r.get(i)); |
329 |
dl |
1.1 |
} |
330 |
|
|
} |
331 |
|
|
|
332 |
dl |
1.8 |
|
333 |
dl |
1.9 |
/** |
334 |
|
|
* toString returns current value. |
335 |
jsr166 |
1.11 |
*/ |
336 |
dl |
1.9 |
public void testToString() { |
337 |
|
|
int[] a = { 17, 3, -42, 99, -7}; |
338 |
|
|
AtomicIntegerArray ai = new AtomicIntegerArray(a); |
339 |
|
|
assertEquals(Arrays.toString(a), ai.toString()); |
340 |
|
|
} |
341 |
dl |
1.8 |
|
342 |
dl |
1.1 |
} |