1 |
dl |
1.1 |
/* |
2 |
dl |
1.6 |
* 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 |
jsr166 |
1.19 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
jsr166 |
1.10 |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
6 |
|
|
* Pat Fisher, Mike Judd. |
7 |
dl |
1.1 |
*/ |
8 |
|
|
|
9 |
jsr166 |
1.21 |
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater; |
10 |
dl |
1.1 |
|
11 |
jsr166 |
1.27 |
import junit.framework.Test; |
12 |
|
|
import junit.framework.TestSuite; |
13 |
|
|
|
14 |
dl |
1.2 |
public class AtomicIntegerFieldUpdaterTest extends JSR166TestCase { |
15 |
dl |
1.1 |
volatile int x = 0; |
16 |
dl |
1.30 |
protected volatile int protectedField; |
17 |
|
|
private volatile int privateField; |
18 |
dl |
1.4 |
int w; |
19 |
dl |
1.30 |
float z; |
20 |
jsr166 |
1.12 |
public static void main(String[] args) { |
21 |
jsr166 |
1.29 |
main(suite(), args); |
22 |
dl |
1.1 |
} |
23 |
|
|
public static Test suite() { |
24 |
|
|
return new TestSuite(AtomicIntegerFieldUpdaterTest.class); |
25 |
|
|
} |
26 |
|
|
|
27 |
dl |
1.30 |
// for testing subclass access |
28 |
|
|
static class AtomicIntegerFieldUpdaterTestSubclass extends AtomicIntegerFieldUpdaterTest { |
29 |
|
|
public void checkPrivateAccess() { |
30 |
|
|
try { |
31 |
|
|
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = |
32 |
|
|
AtomicIntegerFieldUpdater.newUpdater |
33 |
|
|
(AtomicIntegerFieldUpdaterTest.class, "privateField"); |
34 |
|
|
shouldThrow(); |
35 |
|
|
} catch (RuntimeException success) { |
36 |
|
|
assertNotNull(success.getCause()); |
37 |
|
|
} |
38 |
|
|
} |
39 |
|
|
|
40 |
|
|
public void checkCompareAndSetProtectedSub() { |
41 |
jsr166 |
1.31 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = |
42 |
|
|
AtomicIntegerFieldUpdater.newUpdater |
43 |
|
|
(AtomicIntegerFieldUpdaterTest.class, "protectedField"); |
44 |
|
|
this.protectedField = 1; |
45 |
dl |
1.30 |
assertTrue(a.compareAndSet(this, 1, 2)); |
46 |
|
|
assertTrue(a.compareAndSet(this, 2, -4)); |
47 |
|
|
assertEquals(-4, a.get(this)); |
48 |
|
|
assertFalse(a.compareAndSet(this, -5, 7)); |
49 |
|
|
assertEquals(-4, a.get(this)); |
50 |
|
|
assertTrue(a.compareAndSet(this, -4, 7)); |
51 |
|
|
assertEquals(7, a.get(this)); |
52 |
|
|
} |
53 |
|
|
} |
54 |
|
|
|
55 |
|
|
static class UnrelatedClass { |
56 |
jsr166 |
1.31 |
public void checkPackageAccess(AtomicIntegerFieldUpdaterTest obj) { |
57 |
|
|
obj.x = 72; |
58 |
|
|
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = |
59 |
|
|
AtomicIntegerFieldUpdater.newUpdater |
60 |
|
|
(AtomicIntegerFieldUpdaterTest.class, "x"); |
61 |
|
|
assertEquals(72, a.get(obj)); |
62 |
|
|
assertTrue(a.compareAndSet(obj, 72, 73)); |
63 |
|
|
assertEquals(73, a.get(obj)); |
64 |
|
|
} |
65 |
|
|
|
66 |
|
|
public void checkPrivateAccess(AtomicIntegerFieldUpdaterTest obj) { |
67 |
dl |
1.30 |
try { |
68 |
|
|
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a = |
69 |
|
|
AtomicIntegerFieldUpdater.newUpdater |
70 |
jsr166 |
1.31 |
(AtomicIntegerFieldUpdaterTest.class, "privateField"); |
71 |
|
|
throw new AssertionError("should throw"); |
72 |
|
|
} catch (RuntimeException success) { |
73 |
|
|
assertNotNull(success.getCause()); |
74 |
dl |
1.30 |
} |
75 |
|
|
} |
76 |
|
|
} |
77 |
|
|
|
78 |
jsr166 |
1.24 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> updaterFor(String fieldName) { |
79 |
|
|
return AtomicIntegerFieldUpdater.newUpdater |
80 |
|
|
(AtomicIntegerFieldUpdaterTest.class, fieldName); |
81 |
|
|
} |
82 |
|
|
|
83 |
dl |
1.3 |
/** |
84 |
dl |
1.7 |
* Construction with non-existent field throws RuntimeException |
85 |
dl |
1.3 |
*/ |
86 |
|
|
public void testConstructor() { |
87 |
jsr166 |
1.11 |
try { |
88 |
jsr166 |
1.24 |
updaterFor("y"); |
89 |
dl |
1.3 |
shouldThrow(); |
90 |
jsr166 |
1.25 |
} catch (RuntimeException success) { |
91 |
jsr166 |
1.26 |
assertNotNull(success.getCause()); |
92 |
jsr166 |
1.25 |
} |
93 |
dl |
1.2 |
} |
94 |
|
|
|
95 |
dl |
1.3 |
/** |
96 |
jsr166 |
1.25 |
* construction with field not of given type throws IllegalArgumentException |
97 |
dl |
1.3 |
*/ |
98 |
|
|
public void testConstructor2() { |
99 |
jsr166 |
1.11 |
try { |
100 |
jsr166 |
1.24 |
updaterFor("z"); |
101 |
dl |
1.3 |
shouldThrow(); |
102 |
jsr166 |
1.25 |
} catch (IllegalArgumentException success) {} |
103 |
dl |
1.1 |
} |
104 |
|
|
|
105 |
dl |
1.3 |
/** |
106 |
jsr166 |
1.25 |
* construction with non-volatile field throws IllegalArgumentException |
107 |
dl |
1.4 |
*/ |
108 |
|
|
public void testConstructor3() { |
109 |
jsr166 |
1.11 |
try { |
110 |
jsr166 |
1.24 |
updaterFor("w"); |
111 |
dl |
1.4 |
shouldThrow(); |
112 |
jsr166 |
1.25 |
} catch (IllegalArgumentException success) {} |
113 |
dl |
1.4 |
} |
114 |
|
|
|
115 |
|
|
/** |
116 |
dl |
1.30 |
* construction using private field from subclass throws RuntimeException |
117 |
|
|
*/ |
118 |
|
|
public void testPrivateFieldInSubclass() { |
119 |
|
|
AtomicIntegerFieldUpdaterTestSubclass s = |
120 |
|
|
new AtomicIntegerFieldUpdaterTestSubclass(); |
121 |
|
|
s.checkPrivateAccess(); |
122 |
|
|
} |
123 |
|
|
|
124 |
|
|
/** |
125 |
jsr166 |
1.31 |
* construction from unrelated class; package access is allowed, |
126 |
|
|
* private access is not |
127 |
dl |
1.30 |
*/ |
128 |
|
|
public void testUnrelatedClassAccess() { |
129 |
jsr166 |
1.31 |
new UnrelatedClass().checkPackageAccess(this); |
130 |
|
|
new UnrelatedClass().checkPrivateAccess(this); |
131 |
dl |
1.30 |
} |
132 |
|
|
|
133 |
|
|
/** |
134 |
jsr166 |
1.18 |
* get returns the last value set or assigned |
135 |
dl |
1.3 |
*/ |
136 |
|
|
public void testGetSet() { |
137 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
138 |
jsr166 |
1.24 |
a = updaterFor("x"); |
139 |
dl |
1.1 |
x = 1; |
140 |
jsr166 |
1.22 |
assertEquals(1, a.get(this)); |
141 |
|
|
a.set(this, 2); |
142 |
|
|
assertEquals(2, a.get(this)); |
143 |
|
|
a.set(this, -3); |
144 |
|
|
assertEquals(-3, a.get(this)); |
145 |
dl |
1.1 |
} |
146 |
dl |
1.9 |
|
147 |
|
|
/** |
148 |
jsr166 |
1.18 |
* get returns the last value lazySet by same thread |
149 |
dl |
1.9 |
*/ |
150 |
|
|
public void testGetLazySet() { |
151 |
|
|
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
152 |
jsr166 |
1.24 |
a = updaterFor("x"); |
153 |
dl |
1.9 |
x = 1; |
154 |
jsr166 |
1.22 |
assertEquals(1, a.get(this)); |
155 |
|
|
a.lazySet(this, 2); |
156 |
|
|
assertEquals(2, a.get(this)); |
157 |
|
|
a.lazySet(this, -3); |
158 |
|
|
assertEquals(-3, a.get(this)); |
159 |
dl |
1.9 |
} |
160 |
|
|
|
161 |
dl |
1.3 |
/** |
162 |
dl |
1.4 |
* compareAndSet succeeds in changing value if equal to expected else fails |
163 |
dl |
1.3 |
*/ |
164 |
|
|
public void testCompareAndSet() { |
165 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
166 |
jsr166 |
1.24 |
a = updaterFor("x"); |
167 |
dl |
1.1 |
x = 1; |
168 |
jsr166 |
1.22 |
assertTrue(a.compareAndSet(this, 1, 2)); |
169 |
|
|
assertTrue(a.compareAndSet(this, 2, -4)); |
170 |
|
|
assertEquals(-4, a.get(this)); |
171 |
|
|
assertFalse(a.compareAndSet(this, -5, 7)); |
172 |
|
|
assertEquals(-4, a.get(this)); |
173 |
|
|
assertTrue(a.compareAndSet(this, -4, 7)); |
174 |
|
|
assertEquals(7, a.get(this)); |
175 |
dl |
1.1 |
} |
176 |
|
|
|
177 |
dl |
1.4 |
/** |
178 |
dl |
1.30 |
* compareAndSet succeeds in changing protected field value if |
179 |
|
|
* equal to expected else fails |
180 |
|
|
*/ |
181 |
|
|
public void testCompareAndSetProtected() { |
182 |
|
|
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
183 |
|
|
a = updaterFor("protectedField"); |
184 |
|
|
protectedField = 1; |
185 |
|
|
assertTrue(a.compareAndSet(this, 1, 2)); |
186 |
|
|
assertTrue(a.compareAndSet(this, 2, -4)); |
187 |
|
|
assertEquals(-4, a.get(this)); |
188 |
|
|
assertFalse(a.compareAndSet(this, -5, 7)); |
189 |
|
|
assertEquals(-4, a.get(this)); |
190 |
|
|
assertTrue(a.compareAndSet(this, -4, 7)); |
191 |
|
|
assertEquals(7, a.get(this)); |
192 |
|
|
} |
193 |
|
|
|
194 |
|
|
/** |
195 |
|
|
* compareAndSet succeeds in changing protected field value if |
196 |
|
|
* equal to expected else fails |
197 |
|
|
*/ |
198 |
|
|
public void testCompareAndSetProtectedInSubclass() { |
199 |
|
|
AtomicIntegerFieldUpdaterTestSubclass s = |
200 |
|
|
new AtomicIntegerFieldUpdaterTestSubclass(); |
201 |
|
|
s.checkCompareAndSetProtectedSub(); |
202 |
|
|
} |
203 |
|
|
|
204 |
|
|
/** |
205 |
dl |
1.4 |
* compareAndSet in one thread enables another waiting for value |
206 |
|
|
* to succeed |
207 |
|
|
*/ |
208 |
jsr166 |
1.13 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
209 |
dl |
1.4 |
x = 1; |
210 |
jsr166 |
1.24 |
final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
211 |
|
|
a = updaterFor("x"); |
212 |
dl |
1.4 |
|
213 |
jsr166 |
1.14 |
Thread t = new Thread(new CheckedRunnable() { |
214 |
|
|
public void realRun() { |
215 |
|
|
while (!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3)) |
216 |
|
|
Thread.yield(); |
217 |
|
|
}}); |
218 |
jsr166 |
1.13 |
|
219 |
|
|
t.start(); |
220 |
|
|
assertTrue(a.compareAndSet(this, 1, 2)); |
221 |
|
|
t.join(LONG_DELAY_MS); |
222 |
|
|
assertFalse(t.isAlive()); |
223 |
jsr166 |
1.23 |
assertEquals(3, a.get(this)); |
224 |
dl |
1.4 |
} |
225 |
|
|
|
226 |
dl |
1.3 |
/** |
227 |
dl |
1.4 |
* repeated weakCompareAndSet succeeds in changing value when equal |
228 |
jsr166 |
1.10 |
* to expected |
229 |
dl |
1.3 |
*/ |
230 |
|
|
public void testWeakCompareAndSet() { |
231 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
232 |
jsr166 |
1.24 |
a = updaterFor("x"); |
233 |
dl |
1.1 |
x = 1; |
234 |
jsr166 |
1.28 |
do {} while (!a.weakCompareAndSet(this, 1, 2)); |
235 |
|
|
do {} while (!a.weakCompareAndSet(this, 2, -4)); |
236 |
jsr166 |
1.22 |
assertEquals(-4, a.get(this)); |
237 |
jsr166 |
1.28 |
do {} while (!a.weakCompareAndSet(this, -4, 7)); |
238 |
jsr166 |
1.22 |
assertEquals(7, a.get(this)); |
239 |
dl |
1.1 |
} |
240 |
|
|
|
241 |
dl |
1.3 |
/** |
242 |
jsr166 |
1.18 |
* getAndSet returns previous value and sets to given value |
243 |
dl |
1.3 |
*/ |
244 |
|
|
public void testGetAndSet() { |
245 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
246 |
jsr166 |
1.24 |
a = updaterFor("x"); |
247 |
dl |
1.1 |
x = 1; |
248 |
jsr166 |
1.22 |
assertEquals(1, a.getAndSet(this, 0)); |
249 |
|
|
assertEquals(0, a.getAndSet(this, -10)); |
250 |
|
|
assertEquals(-10, a.getAndSet(this, 1)); |
251 |
dl |
1.1 |
} |
252 |
|
|
|
253 |
dl |
1.3 |
/** |
254 |
dl |
1.4 |
* getAndAdd returns previous value and adds given value |
255 |
dl |
1.3 |
*/ |
256 |
|
|
public void testGetAndAdd() { |
257 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
258 |
jsr166 |
1.24 |
a = updaterFor("x"); |
259 |
dl |
1.1 |
x = 1; |
260 |
jsr166 |
1.22 |
assertEquals(1, a.getAndAdd(this, 2)); |
261 |
|
|
assertEquals(3, a.get(this)); |
262 |
|
|
assertEquals(3, a.getAndAdd(this, -4)); |
263 |
|
|
assertEquals(-1, a.get(this)); |
264 |
dl |
1.1 |
} |
265 |
|
|
|
266 |
dl |
1.3 |
/** |
267 |
dl |
1.4 |
* getAndDecrement returns previous value and decrements |
268 |
dl |
1.3 |
*/ |
269 |
|
|
public void testGetAndDecrement() { |
270 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
271 |
jsr166 |
1.24 |
a = updaterFor("x"); |
272 |
dl |
1.1 |
x = 1; |
273 |
jsr166 |
1.22 |
assertEquals(1, a.getAndDecrement(this)); |
274 |
|
|
assertEquals(0, a.getAndDecrement(this)); |
275 |
|
|
assertEquals(-1, a.getAndDecrement(this)); |
276 |
dl |
1.1 |
} |
277 |
|
|
|
278 |
dl |
1.3 |
/** |
279 |
dl |
1.4 |
* getAndIncrement returns previous value and increments |
280 |
dl |
1.3 |
*/ |
281 |
|
|
public void testGetAndIncrement() { |
282 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
283 |
jsr166 |
1.24 |
a = updaterFor("x"); |
284 |
dl |
1.1 |
x = 1; |
285 |
jsr166 |
1.22 |
assertEquals(1, a.getAndIncrement(this)); |
286 |
|
|
assertEquals(2, a.get(this)); |
287 |
|
|
a.set(this, -2); |
288 |
|
|
assertEquals(-2, a.getAndIncrement(this)); |
289 |
|
|
assertEquals(-1, a.getAndIncrement(this)); |
290 |
|
|
assertEquals(0, a.getAndIncrement(this)); |
291 |
|
|
assertEquals(1, a.get(this)); |
292 |
dl |
1.1 |
} |
293 |
|
|
|
294 |
dl |
1.3 |
/** |
295 |
dl |
1.4 |
* addAndGet adds given value to current, and returns current value |
296 |
dl |
1.3 |
*/ |
297 |
|
|
public void testAddAndGet() { |
298 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
299 |
jsr166 |
1.24 |
a = updaterFor("x"); |
300 |
dl |
1.1 |
x = 1; |
301 |
jsr166 |
1.22 |
assertEquals(3, a.addAndGet(this, 2)); |
302 |
|
|
assertEquals(3, a.get(this)); |
303 |
|
|
assertEquals(-1, a.addAndGet(this, -4)); |
304 |
|
|
assertEquals(-1, a.get(this)); |
305 |
dl |
1.1 |
} |
306 |
|
|
|
307 |
dl |
1.3 |
/** |
308 |
dl |
1.4 |
* decrementAndGet decrements and returns current value |
309 |
dl |
1.3 |
*/ |
310 |
|
|
public void testDecrementAndGet() { |
311 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
312 |
jsr166 |
1.24 |
a = updaterFor("x"); |
313 |
dl |
1.1 |
x = 1; |
314 |
jsr166 |
1.22 |
assertEquals(0, a.decrementAndGet(this)); |
315 |
|
|
assertEquals(-1, a.decrementAndGet(this)); |
316 |
|
|
assertEquals(-2, a.decrementAndGet(this)); |
317 |
|
|
assertEquals(-2, a.get(this)); |
318 |
dl |
1.1 |
} |
319 |
|
|
|
320 |
dl |
1.3 |
/** |
321 |
dl |
1.4 |
* incrementAndGet increments and returns current value |
322 |
dl |
1.3 |
*/ |
323 |
|
|
public void testIncrementAndGet() { |
324 |
dl |
1.8 |
AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
325 |
jsr166 |
1.24 |
a = updaterFor("x"); |
326 |
dl |
1.1 |
x = 1; |
327 |
jsr166 |
1.22 |
assertEquals(2, a.incrementAndGet(this)); |
328 |
|
|
assertEquals(2, a.get(this)); |
329 |
|
|
a.set(this, -2); |
330 |
|
|
assertEquals(-1, a.incrementAndGet(this)); |
331 |
|
|
assertEquals(0, a.incrementAndGet(this)); |
332 |
|
|
assertEquals(1, a.incrementAndGet(this)); |
333 |
|
|
assertEquals(1, a.get(this)); |
334 |
dl |
1.1 |
} |
335 |
|
|
|
336 |
|
|
} |