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 |
1.19 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
jsr166 |
1.10 |
* 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 |
1.21 |
import java.util.Arrays; |
10 |
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import java.util.concurrent.atomic.AtomicLongArray; |
11 |
dl |
1.1 |
|
12 |
jsr166 |
1.28 |
import junit.framework.Test; |
13 |
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import junit.framework.TestSuite; |
14 |
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15 |
dl |
1.3 |
public class AtomicLongArrayTest extends JSR166TestCase { |
16 |
jsr166 |
1.16 |
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(AtomicLongArrayTest.class); |
21 |
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} |
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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 |
jsr166 |
1.12 |
public void testConstructor() { |
27 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
28 |
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for (int i = 0; i < SIZE; i++) |
29 |
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assertEquals(0, aa.get(i)); |
30 |
dl |
1.1 |
} |
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() { |
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try { |
37 |
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long[] a = null; |
38 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(a); |
39 |
jsr166 |
1.13 |
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 |
jsr166 |
1.22 |
long[] a = { 17L, 3L, -42L, 99L, -7L }; |
48 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(a); |
49 |
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assertEquals(a.length, aa.length()); |
50 |
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for (int i = 0; i < a.length; i++) |
51 |
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assertEquals(a[i], aa.get(i)); |
52 |
dl |
1.7 |
} |
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 |
1.12 |
public void testIndexing() { |
58 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
59 |
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for (int index : new int[] { -1, SIZE }) { |
60 |
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try { |
61 |
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aa.get(index); |
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shouldThrow(); |
63 |
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} catch (IndexOutOfBoundsException success) {} |
64 |
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try { |
65 |
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aa.set(index, 1); |
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shouldThrow(); |
67 |
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} catch (IndexOutOfBoundsException success) {} |
68 |
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try { |
69 |
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aa.lazySet(index, 1); |
70 |
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shouldThrow(); |
71 |
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} catch (IndexOutOfBoundsException success) {} |
72 |
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try { |
73 |
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aa.compareAndSet(index, 1, 2); |
74 |
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shouldThrow(); |
75 |
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} catch (IndexOutOfBoundsException success) {} |
76 |
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try { |
77 |
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aa.weakCompareAndSet(index, 1, 2); |
78 |
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shouldThrow(); |
79 |
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} catch (IndexOutOfBoundsException success) {} |
80 |
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try { |
81 |
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aa.getAndAdd(index, 1); |
82 |
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shouldThrow(); |
83 |
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} catch (IndexOutOfBoundsException success) {} |
84 |
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try { |
85 |
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aa.addAndGet(index, 1); |
86 |
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shouldThrow(); |
87 |
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} catch (IndexOutOfBoundsException success) {} |
88 |
dl |
1.5 |
} |
89 |
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} |
90 |
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/** |
92 |
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* get returns the last value set at index |
93 |
dl |
1.4 |
*/ |
94 |
jsr166 |
1.12 |
public void testGetSet() { |
95 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
96 |
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for (int i = 0; i < SIZE; i++) { |
97 |
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aa.set(i, 1); |
98 |
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assertEquals(1, aa.get(i)); |
99 |
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aa.set(i, 2); |
100 |
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assertEquals(2, aa.get(i)); |
101 |
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aa.set(i, -3); |
102 |
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assertEquals(-3, aa.get(i)); |
103 |
dl |
1.1 |
} |
104 |
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} |
105 |
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106 |
dl |
1.4 |
/** |
107 |
dl |
1.9 |
* get returns the last value lazySet at index by same thread |
108 |
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*/ |
109 |
jsr166 |
1.12 |
public void testGetLazySet() { |
110 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
111 |
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for (int i = 0; i < SIZE; i++) { |
112 |
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aa.lazySet(i, 1); |
113 |
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assertEquals(1, aa.get(i)); |
114 |
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aa.lazySet(i, 2); |
115 |
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assertEquals(2, aa.get(i)); |
116 |
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aa.lazySet(i, -3); |
117 |
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assertEquals(-3, aa.get(i)); |
118 |
dl |
1.9 |
} |
119 |
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} |
120 |
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121 |
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/** |
122 |
dl |
1.5 |
* compareAndSet succeeds in changing value if equal to expected else fails |
123 |
dl |
1.4 |
*/ |
124 |
jsr166 |
1.12 |
public void testCompareAndSet() { |
125 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
126 |
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for (int i = 0; i < SIZE; i++) { |
127 |
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aa.set(i, 1); |
128 |
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assertTrue(aa.compareAndSet(i, 1, 2)); |
129 |
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assertTrue(aa.compareAndSet(i, 2, -4)); |
130 |
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assertEquals(-4, aa.get(i)); |
131 |
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assertFalse(aa.compareAndSet(i, -5, 7)); |
132 |
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assertEquals(-4, aa.get(i)); |
133 |
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assertTrue(aa.compareAndSet(i, -4, 7)); |
134 |
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assertEquals(7, aa.get(i)); |
135 |
dl |
1.1 |
} |
136 |
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} |
137 |
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138 |
dl |
1.4 |
/** |
139 |
dl |
1.5 |
* compareAndSet in one thread enables another waiting for value |
140 |
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* to succeed |
141 |
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*/ |
142 |
jsr166 |
1.13 |
public void testCompareAndSetInMultipleThreads() throws InterruptedException { |
143 |
dl |
1.5 |
final AtomicLongArray a = new AtomicLongArray(1); |
144 |
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a.set(0, 1); |
145 |
jsr166 |
1.14 |
Thread t = new Thread(new CheckedRunnable() { |
146 |
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public void realRun() { |
147 |
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while (!a.compareAndSet(0, 2, 3)) |
148 |
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Thread.yield(); |
149 |
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}}); |
150 |
jsr166 |
1.13 |
|
151 |
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t.start(); |
152 |
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assertTrue(a.compareAndSet(0, 1, 2)); |
153 |
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t.join(LONG_DELAY_MS); |
154 |
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assertFalse(t.isAlive()); |
155 |
jsr166 |
1.24 |
assertEquals(3, a.get(0)); |
156 |
dl |
1.5 |
} |
157 |
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158 |
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/** |
159 |
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* repeated weakCompareAndSet succeeds in changing value when equal |
160 |
jsr166 |
1.10 |
* to expected |
161 |
dl |
1.4 |
*/ |
162 |
jsr166 |
1.12 |
public void testWeakCompareAndSet() { |
163 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
164 |
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for (int i = 0; i < SIZE; i++) { |
165 |
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aa.set(i, 1); |
166 |
jsr166 |
1.29 |
do {} while (!aa.weakCompareAndSet(i, 1, 2)); |
167 |
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do {} while (!aa.weakCompareAndSet(i, 2, -4)); |
168 |
jsr166 |
1.25 |
assertEquals(-4, aa.get(i)); |
169 |
jsr166 |
1.29 |
do {} while (!aa.weakCompareAndSet(i, -4, 7)); |
170 |
jsr166 |
1.25 |
assertEquals(7, aa.get(i)); |
171 |
dl |
1.1 |
} |
172 |
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} |
173 |
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|
174 |
dl |
1.4 |
/** |
175 |
jsr166 |
1.18 |
* getAndSet returns previous value and sets to given value at given index |
176 |
dl |
1.4 |
*/ |
177 |
jsr166 |
1.12 |
public void testGetAndSet() { |
178 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
179 |
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for (int i = 0; i < SIZE; i++) { |
180 |
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aa.set(i, 1); |
181 |
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assertEquals(1, aa.getAndSet(i, 0)); |
182 |
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assertEquals(0, aa.getAndSet(i, -10)); |
183 |
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assertEquals(-10, aa.getAndSet(i, 1)); |
184 |
dl |
1.1 |
} |
185 |
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} |
186 |
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187 |
dl |
1.4 |
/** |
188 |
jsr166 |
1.18 |
* getAndAdd returns previous value and adds given value |
189 |
dl |
1.4 |
*/ |
190 |
jsr166 |
1.12 |
public void testGetAndAdd() { |
191 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
192 |
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for (int i = 0; i < SIZE; i++) { |
193 |
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aa.set(i, 1); |
194 |
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assertEquals(1, aa.getAndAdd(i, 2)); |
195 |
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assertEquals(3, aa.get(i)); |
196 |
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assertEquals(3, aa.getAndAdd(i, -4)); |
197 |
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assertEquals(-1, aa.get(i)); |
198 |
dl |
1.1 |
} |
199 |
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} |
200 |
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|
201 |
dl |
1.4 |
/** |
202 |
dl |
1.5 |
* getAndDecrement returns previous value and decrements |
203 |
dl |
1.4 |
*/ |
204 |
jsr166 |
1.12 |
public void testGetAndDecrement() { |
205 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
206 |
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for (int i = 0; i < SIZE; i++) { |
207 |
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aa.set(i, 1); |
208 |
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assertEquals(1, aa.getAndDecrement(i)); |
209 |
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assertEquals(0, aa.getAndDecrement(i)); |
210 |
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assertEquals(-1, aa.getAndDecrement(i)); |
211 |
dl |
1.1 |
} |
212 |
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} |
213 |
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|
214 |
dl |
1.4 |
/** |
215 |
dl |
1.5 |
* getAndIncrement returns previous value and increments |
216 |
dl |
1.4 |
*/ |
217 |
jsr166 |
1.12 |
public void testGetAndIncrement() { |
218 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
219 |
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for (int i = 0; i < SIZE; i++) { |
220 |
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aa.set(i, 1); |
221 |
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assertEquals(1, aa.getAndIncrement(i)); |
222 |
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assertEquals(2, aa.get(i)); |
223 |
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aa.set(i, -2); |
224 |
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assertEquals(-2, aa.getAndIncrement(i)); |
225 |
|
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assertEquals(-1, aa.getAndIncrement(i)); |
226 |
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assertEquals(0, aa.getAndIncrement(i)); |
227 |
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assertEquals(1, aa.get(i)); |
228 |
dl |
1.1 |
} |
229 |
|
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} |
230 |
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|
231 |
dl |
1.4 |
/** |
232 |
jsr166 |
1.18 |
* addAndGet adds given value to current, and returns current value |
233 |
dl |
1.4 |
*/ |
234 |
dl |
1.1 |
public void testAddAndGet() { |
235 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
236 |
|
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for (int i = 0; i < SIZE; i++) { |
237 |
|
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aa.set(i, 1); |
238 |
|
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assertEquals(3, aa.addAndGet(i, 2)); |
239 |
|
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assertEquals(3, aa.get(i)); |
240 |
|
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assertEquals(-1, aa.addAndGet(i, -4)); |
241 |
|
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assertEquals(-1, aa.get(i)); |
242 |
dl |
1.1 |
} |
243 |
|
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} |
244 |
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|
245 |
dl |
1.4 |
/** |
246 |
dl |
1.5 |
* decrementAndGet decrements and returns current value |
247 |
dl |
1.4 |
*/ |
248 |
jsr166 |
1.12 |
public void testDecrementAndGet() { |
249 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
250 |
|
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for (int i = 0; i < SIZE; i++) { |
251 |
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aa.set(i, 1); |
252 |
|
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assertEquals(0, aa.decrementAndGet(i)); |
253 |
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assertEquals(-1, aa.decrementAndGet(i)); |
254 |
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assertEquals(-2, aa.decrementAndGet(i)); |
255 |
|
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assertEquals(-2, aa.get(i)); |
256 |
dl |
1.1 |
} |
257 |
|
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} |
258 |
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|
259 |
dl |
1.4 |
/** |
260 |
dl |
1.5 |
* incrementAndGet increments and returns current value |
261 |
dl |
1.4 |
*/ |
262 |
dl |
1.1 |
public void testIncrementAndGet() { |
263 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(SIZE); |
264 |
|
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for (int i = 0; i < SIZE; i++) { |
265 |
|
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aa.set(i, 1); |
266 |
|
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assertEquals(2, aa.incrementAndGet(i)); |
267 |
|
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assertEquals(2, aa.get(i)); |
268 |
|
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aa.set(i, -2); |
269 |
|
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assertEquals(-1, aa.incrementAndGet(i)); |
270 |
|
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assertEquals(0, aa.incrementAndGet(i)); |
271 |
|
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assertEquals(1, aa.incrementAndGet(i)); |
272 |
|
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assertEquals(1, aa.get(i)); |
273 |
dl |
1.1 |
} |
274 |
|
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} |
275 |
dl |
1.2 |
|
276 |
jsr166 |
1.17 |
class Counter extends CheckedRunnable { |
277 |
jsr166 |
1.25 |
final AtomicLongArray aa; |
278 |
dl |
1.3 |
volatile long counts; |
279 |
jsr166 |
1.25 |
Counter(AtomicLongArray a) { aa = a; } |
280 |
jsr166 |
1.17 |
public void realRun() { |
281 |
dl |
1.3 |
for (;;) { |
282 |
|
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boolean done = true; |
283 |
jsr166 |
1.25 |
for (int i = 0; i < aa.length(); i++) { |
284 |
|
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long v = aa.get(i); |
285 |
jsr166 |
1.17 |
assertTrue(v >= 0); |
286 |
dl |
1.3 |
if (v != 0) { |
287 |
|
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done = false; |
288 |
jsr166 |
1.25 |
if (aa.compareAndSet(i, v, v-1)) |
289 |
dl |
1.3 |
++counts; |
290 |
|
|
} |
291 |
|
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} |
292 |
|
|
if (done) |
293 |
|
|
break; |
294 |
|
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} |
295 |
|
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} |
296 |
|
|
} |
297 |
|
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|
298 |
dl |
1.4 |
/** |
299 |
dl |
1.5 |
* Multiple threads using same array of counters successfully |
300 |
|
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* update a number of times equal to total count |
301 |
dl |
1.4 |
*/ |
302 |
jsr166 |
1.13 |
public void testCountingInMultipleThreads() throws InterruptedException { |
303 |
jsr166 |
1.25 |
final AtomicLongArray aa = new AtomicLongArray(SIZE); |
304 |
jsr166 |
1.27 |
long countdown = 10000; |
305 |
jsr166 |
1.25 |
for (int i = 0; i < SIZE; i++) |
306 |
jsr166 |
1.27 |
aa.set(i, countdown); |
307 |
jsr166 |
1.25 |
Counter c1 = new Counter(aa); |
308 |
|
|
Counter c2 = new Counter(aa); |
309 |
jsr166 |
1.13 |
Thread t1 = new Thread(c1); |
310 |
|
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Thread t2 = new Thread(c2); |
311 |
|
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t1.start(); |
312 |
|
|
t2.start(); |
313 |
|
|
t1.join(); |
314 |
|
|
t2.join(); |
315 |
jsr166 |
1.27 |
assertEquals(c1.counts+c2.counts, SIZE * countdown); |
316 |
dl |
1.3 |
} |
317 |
|
|
|
318 |
dl |
1.4 |
/** |
319 |
dl |
1.5 |
* a deserialized serialized array holds same values |
320 |
dl |
1.4 |
*/ |
321 |
jsr166 |
1.13 |
public void testSerialization() throws Exception { |
322 |
jsr166 |
1.21 |
AtomicLongArray x = new AtomicLongArray(SIZE); |
323 |
jsr166 |
1.25 |
for (int i = 0; i < SIZE; i++) |
324 |
jsr166 |
1.21 |
x.set(i, -i); |
325 |
|
|
AtomicLongArray y = serialClone(x); |
326 |
jsr166 |
1.26 |
assertNotSame(x, y); |
327 |
jsr166 |
1.21 |
assertEquals(x.length(), y.length()); |
328 |
jsr166 |
1.25 |
for (int i = 0; i < SIZE; i++) { |
329 |
jsr166 |
1.21 |
assertEquals(x.get(i), y.get(i)); |
330 |
dl |
1.2 |
} |
331 |
dl |
1.8 |
} |
332 |
|
|
|
333 |
|
|
/** |
334 |
|
|
* toString returns current value. |
335 |
jsr166 |
1.10 |
*/ |
336 |
dl |
1.8 |
public void testToString() { |
337 |
jsr166 |
1.22 |
long[] a = { 17, 3, -42, 99, -7 }; |
338 |
jsr166 |
1.25 |
AtomicLongArray aa = new AtomicLongArray(a); |
339 |
|
|
assertEquals(Arrays.toString(a), aa.toString()); |
340 |
dl |
1.2 |
} |
341 |
|
|
|
342 |
dl |
1.1 |
} |