1 |
/* |
2 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
* Expert Group and released to the public domain, as explained at |
4 |
* http://creativecommons.org/licenses/publicdomain |
5 |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
6 |
* Pat Fisher, Mike Judd. |
7 |
*/ |
8 |
|
9 |
import java.util.concurrent.atomic.*; |
10 |
import junit.framework.*; |
11 |
import java.util.*; |
12 |
|
13 |
public class AtomicLongFieldUpdaterTest extends JSR166TestCase { |
14 |
volatile long x = 0; |
15 |
int z; |
16 |
long w; |
17 |
|
18 |
public static void main(String[] args) { |
19 |
junit.textui.TestRunner.run(suite()); |
20 |
} |
21 |
public static Test suite() { |
22 |
return new TestSuite(AtomicLongFieldUpdaterTest.class); |
23 |
} |
24 |
|
25 |
/** |
26 |
* Construction with non-existent field throws RuntimeException |
27 |
*/ |
28 |
public void testConstructor() { |
29 |
try { |
30 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
31 |
a = AtomicLongFieldUpdater.newUpdater |
32 |
(AtomicLongFieldUpdaterTest.class, "y"); |
33 |
shouldThrow(); |
34 |
} catch (RuntimeException success) {} |
35 |
} |
36 |
|
37 |
/** |
38 |
* construction with field not of given type throws RuntimeException |
39 |
*/ |
40 |
public void testConstructor2() { |
41 |
try { |
42 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
43 |
a = AtomicLongFieldUpdater.newUpdater |
44 |
(AtomicLongFieldUpdaterTest.class, "z"); |
45 |
shouldThrow(); |
46 |
} catch (RuntimeException success) {} |
47 |
} |
48 |
|
49 |
/** |
50 |
* construction with non-volatile field throws RuntimeException |
51 |
*/ |
52 |
public void testConstructor3() { |
53 |
try { |
54 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
55 |
a = AtomicLongFieldUpdater.newUpdater |
56 |
(AtomicLongFieldUpdaterTest.class, "w"); |
57 |
shouldThrow(); |
58 |
} catch (RuntimeException success) {} |
59 |
} |
60 |
|
61 |
/** |
62 |
* get returns the last value set or assigned |
63 |
*/ |
64 |
public void testGetSet() { |
65 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
66 |
try { |
67 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
68 |
} catch (RuntimeException ok) { |
69 |
return; |
70 |
} |
71 |
x = 1; |
72 |
assertEquals(1,a.get(this)); |
73 |
a.set(this,2); |
74 |
assertEquals(2,a.get(this)); |
75 |
a.set(this,-3); |
76 |
assertEquals(-3,a.get(this)); |
77 |
} |
78 |
|
79 |
/** |
80 |
* get returns the last value lazySet by same thread |
81 |
*/ |
82 |
public void testGetLazySet() { |
83 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
84 |
try { |
85 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
86 |
} catch (RuntimeException ok) { |
87 |
return; |
88 |
} |
89 |
x = 1; |
90 |
assertEquals(1,a.get(this)); |
91 |
a.lazySet(this,2); |
92 |
assertEquals(2,a.get(this)); |
93 |
a.lazySet(this,-3); |
94 |
assertEquals(-3,a.get(this)); |
95 |
} |
96 |
|
97 |
|
98 |
/** |
99 |
* compareAndSet succeeds in changing value if equal to expected else fails |
100 |
*/ |
101 |
public void testCompareAndSet() { |
102 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
103 |
try { |
104 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
105 |
} catch (RuntimeException ok) { |
106 |
return; |
107 |
} |
108 |
x = 1; |
109 |
assertTrue(a.compareAndSet(this,1,2)); |
110 |
assertTrue(a.compareAndSet(this,2,-4)); |
111 |
assertEquals(-4,a.get(this)); |
112 |
assertFalse(a.compareAndSet(this,-5,7)); |
113 |
assertFalse((7 == a.get(this))); |
114 |
assertTrue(a.compareAndSet(this,-4,7)); |
115 |
assertEquals(7,a.get(this)); |
116 |
} |
117 |
|
118 |
|
119 |
/** |
120 |
* compareAndSet in one thread enables another waiting for value |
121 |
* to succeed |
122 |
*/ |
123 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
124 |
x = 1; |
125 |
final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>a; |
126 |
try { |
127 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
128 |
} catch (RuntimeException ok) { |
129 |
return; |
130 |
} |
131 |
|
132 |
Thread t = new Thread(new CheckedRunnable() { |
133 |
public void realRun() { |
134 |
while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) |
135 |
Thread.yield(); |
136 |
}}); |
137 |
|
138 |
t.start(); |
139 |
assertTrue(a.compareAndSet(this, 1, 2)); |
140 |
t.join(LONG_DELAY_MS); |
141 |
assertFalse(t.isAlive()); |
142 |
assertEquals(a.get(this), 3); |
143 |
} |
144 |
|
145 |
/** |
146 |
* repeated weakCompareAndSet succeeds in changing value when equal |
147 |
* to expected |
148 |
*/ |
149 |
public void testWeakCompareAndSet() { |
150 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
151 |
try { |
152 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
153 |
} catch (RuntimeException ok) { |
154 |
return; |
155 |
} |
156 |
x = 1; |
157 |
while (!a.weakCompareAndSet(this,1,2)); |
158 |
while (!a.weakCompareAndSet(this,2,-4)); |
159 |
assertEquals(-4,a.get(this)); |
160 |
while (!a.weakCompareAndSet(this,-4,7)); |
161 |
assertEquals(7,a.get(this)); |
162 |
} |
163 |
|
164 |
/** |
165 |
* getAndSet returns previous value and sets to given value |
166 |
*/ |
167 |
public void testGetAndSet() { |
168 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
169 |
try { |
170 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
171 |
} catch (RuntimeException ok) { |
172 |
return; |
173 |
} |
174 |
x = 1; |
175 |
assertEquals(1,a.getAndSet(this, 0)); |
176 |
assertEquals(0,a.getAndSet(this,-10)); |
177 |
assertEquals(-10,a.getAndSet(this,1)); |
178 |
} |
179 |
|
180 |
/** |
181 |
* getAndAdd returns previous value and adds given value |
182 |
*/ |
183 |
public void testGetAndAdd() { |
184 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
185 |
try { |
186 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
187 |
} catch (RuntimeException ok) { |
188 |
return; |
189 |
} |
190 |
x = 1; |
191 |
assertEquals(1,a.getAndAdd(this,2)); |
192 |
assertEquals(3,a.get(this)); |
193 |
assertEquals(3,a.getAndAdd(this,-4)); |
194 |
assertEquals(-1,a.get(this)); |
195 |
} |
196 |
|
197 |
/** |
198 |
* getAndDecrement returns previous value and decrements |
199 |
*/ |
200 |
public void testGetAndDecrement() { |
201 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
202 |
try { |
203 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
204 |
} catch (RuntimeException ok) { |
205 |
return; |
206 |
} |
207 |
x = 1; |
208 |
assertEquals(1,a.getAndDecrement(this)); |
209 |
assertEquals(0,a.getAndDecrement(this)); |
210 |
assertEquals(-1,a.getAndDecrement(this)); |
211 |
} |
212 |
|
213 |
/** |
214 |
* getAndIncrement returns previous value and increments |
215 |
*/ |
216 |
public void testGetAndIncrement() { |
217 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
218 |
try { |
219 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
220 |
} catch (RuntimeException ok) { |
221 |
return; |
222 |
} |
223 |
x = 1; |
224 |
assertEquals(1,a.getAndIncrement(this)); |
225 |
assertEquals(2,a.get(this)); |
226 |
a.set(this,-2); |
227 |
assertEquals(-2,a.getAndIncrement(this)); |
228 |
assertEquals(-1,a.getAndIncrement(this)); |
229 |
assertEquals(0,a.getAndIncrement(this)); |
230 |
assertEquals(1,a.get(this)); |
231 |
} |
232 |
|
233 |
/** |
234 |
* addAndGet adds given value to current, and returns current value |
235 |
*/ |
236 |
public void testAddAndGet() { |
237 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
238 |
try { |
239 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
240 |
} catch (RuntimeException ok) { |
241 |
return; |
242 |
} |
243 |
x = 1; |
244 |
assertEquals(3,a.addAndGet(this,2)); |
245 |
assertEquals(3,a.get(this)); |
246 |
assertEquals(-1,a.addAndGet(this,-4)); |
247 |
assertEquals(-1,a.get(this)); |
248 |
} |
249 |
|
250 |
/** |
251 |
* decrementAndGet decrements and returns current value |
252 |
*/ |
253 |
public void testDecrementAndGet() { |
254 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
255 |
try { |
256 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
257 |
} catch (RuntimeException ok) { |
258 |
return; |
259 |
} |
260 |
x = 1; |
261 |
assertEquals(0,a.decrementAndGet(this)); |
262 |
assertEquals(-1,a.decrementAndGet(this)); |
263 |
assertEquals(-2,a.decrementAndGet(this)); |
264 |
assertEquals(-2,a.get(this)); |
265 |
} |
266 |
|
267 |
/** |
268 |
* incrementAndGet increments and returns current value |
269 |
*/ |
270 |
public void testIncrementAndGet() { |
271 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
272 |
try { |
273 |
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
274 |
} catch (RuntimeException ok) { |
275 |
return; |
276 |
} |
277 |
x = 1; |
278 |
assertEquals(2,a.incrementAndGet(this)); |
279 |
assertEquals(2,a.get(this)); |
280 |
a.set(this,-2); |
281 |
assertEquals(-1,a.incrementAndGet(this)); |
282 |
assertEquals(0,a.incrementAndGet(this)); |
283 |
assertEquals(1,a.incrementAndGet(this)); |
284 |
assertEquals(1,a.get(this)); |
285 |
} |
286 |
|
287 |
} |