| 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/publicdomain/zero/1.0/ |
| 5 |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
| 6 |
* Pat Fisher, Mike Judd. |
| 7 |
*/ |
| 8 |
|
| 9 |
import java.util.concurrent.atomic.AtomicLong; |
| 10 |
|
| 11 |
import junit.framework.Test; |
| 12 |
import junit.framework.TestSuite; |
| 13 |
|
| 14 |
public class AtomicLongTest extends JSR166TestCase { |
| 15 |
public static void main(String[] args) { |
| 16 |
main(suite(), args); |
| 17 |
} |
| 18 |
public static Test suite() { |
| 19 |
return new TestSuite(AtomicLongTest.class); |
| 20 |
} |
| 21 |
|
| 22 |
final long[] VALUES = { |
| 23 |
Long.MIN_VALUE, |
| 24 |
Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE, |
| 25 |
Long.MAX_VALUE, |
| 26 |
}; |
| 27 |
|
| 28 |
/** |
| 29 |
* constructor initializes to given value |
| 30 |
*/ |
| 31 |
public void testConstructor() { |
| 32 |
AtomicLong ai = new AtomicLong(1); |
| 33 |
assertEquals(1, ai.get()); |
| 34 |
} |
| 35 |
|
| 36 |
/** |
| 37 |
* default constructed initializes to zero |
| 38 |
*/ |
| 39 |
public void testConstructor2() { |
| 40 |
AtomicLong ai = new AtomicLong(); |
| 41 |
assertEquals(0, ai.get()); |
| 42 |
} |
| 43 |
|
| 44 |
/** |
| 45 |
* get returns the last value set |
| 46 |
*/ |
| 47 |
public void testGetSet() { |
| 48 |
AtomicLong ai = new AtomicLong(1); |
| 49 |
assertEquals(1, ai.get()); |
| 50 |
ai.set(2); |
| 51 |
assertEquals(2, ai.get()); |
| 52 |
ai.set(-3); |
| 53 |
assertEquals(-3, ai.get()); |
| 54 |
} |
| 55 |
|
| 56 |
/** |
| 57 |
* get returns the last value lazySet in same thread |
| 58 |
*/ |
| 59 |
public void testGetLazySet() { |
| 60 |
AtomicLong ai = new AtomicLong(1); |
| 61 |
assertEquals(1, ai.get()); |
| 62 |
ai.lazySet(2); |
| 63 |
assertEquals(2, ai.get()); |
| 64 |
ai.lazySet(-3); |
| 65 |
assertEquals(-3, ai.get()); |
| 66 |
} |
| 67 |
|
| 68 |
/** |
| 69 |
* compareAndSet succeeds in changing value if equal to expected else fails |
| 70 |
*/ |
| 71 |
public void testCompareAndSet() { |
| 72 |
AtomicLong ai = new AtomicLong(1); |
| 73 |
assertTrue(ai.compareAndSet(1, 2)); |
| 74 |
assertTrue(ai.compareAndSet(2, -4)); |
| 75 |
assertEquals(-4, ai.get()); |
| 76 |
assertFalse(ai.compareAndSet(-5, 7)); |
| 77 |
assertEquals(-4, ai.get()); |
| 78 |
assertTrue(ai.compareAndSet(-4, 7)); |
| 79 |
assertEquals(7, ai.get()); |
| 80 |
} |
| 81 |
|
| 82 |
/** |
| 83 |
* compareAndSet in one thread enables another waiting for value |
| 84 |
* to succeed |
| 85 |
*/ |
| 86 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
| 87 |
final AtomicLong ai = new AtomicLong(1); |
| 88 |
Thread t = new Thread(new CheckedRunnable() { |
| 89 |
public void realRun() { |
| 90 |
while (!ai.compareAndSet(2, 3)) |
| 91 |
Thread.yield(); |
| 92 |
}}); |
| 93 |
|
| 94 |
t.start(); |
| 95 |
assertTrue(ai.compareAndSet(1, 2)); |
| 96 |
t.join(LONG_DELAY_MS); |
| 97 |
assertFalse(t.isAlive()); |
| 98 |
assertEquals(3, ai.get()); |
| 99 |
} |
| 100 |
|
| 101 |
/** |
| 102 |
* repeated weakCompareAndSet succeeds in changing value when equal |
| 103 |
* to expected |
| 104 |
*/ |
| 105 |
public void testWeakCompareAndSet() { |
| 106 |
AtomicLong ai = new AtomicLong(1); |
| 107 |
do {} while (!ai.weakCompareAndSet(1, 2)); |
| 108 |
do {} while (!ai.weakCompareAndSet(2, -4)); |
| 109 |
assertEquals(-4, ai.get()); |
| 110 |
do {} while (!ai.weakCompareAndSet(-4, 7)); |
| 111 |
assertEquals(7, ai.get()); |
| 112 |
} |
| 113 |
|
| 114 |
/** |
| 115 |
* getAndSet returns previous value and sets to given value |
| 116 |
*/ |
| 117 |
public void testGetAndSet() { |
| 118 |
AtomicLong ai = new AtomicLong(1); |
| 119 |
assertEquals(1, ai.getAndSet(0)); |
| 120 |
assertEquals(0, ai.getAndSet(-10)); |
| 121 |
assertEquals(-10, ai.getAndSet(1)); |
| 122 |
} |
| 123 |
|
| 124 |
/** |
| 125 |
* getAndAdd returns previous value and adds given value |
| 126 |
*/ |
| 127 |
public void testGetAndAdd() { |
| 128 |
AtomicLong ai = new AtomicLong(1); |
| 129 |
assertEquals(1, ai.getAndAdd(2)); |
| 130 |
assertEquals(3, ai.get()); |
| 131 |
assertEquals(3, ai.getAndAdd(-4)); |
| 132 |
assertEquals(-1, ai.get()); |
| 133 |
} |
| 134 |
|
| 135 |
/** |
| 136 |
* getAndDecrement returns previous value and decrements |
| 137 |
*/ |
| 138 |
public void testGetAndDecrement() { |
| 139 |
AtomicLong ai = new AtomicLong(1); |
| 140 |
assertEquals(1, ai.getAndDecrement()); |
| 141 |
assertEquals(0, ai.getAndDecrement()); |
| 142 |
assertEquals(-1, ai.getAndDecrement()); |
| 143 |
} |
| 144 |
|
| 145 |
/** |
| 146 |
* getAndIncrement returns previous value and increments |
| 147 |
*/ |
| 148 |
public void testGetAndIncrement() { |
| 149 |
AtomicLong ai = new AtomicLong(1); |
| 150 |
assertEquals(1, ai.getAndIncrement()); |
| 151 |
assertEquals(2, ai.get()); |
| 152 |
ai.set(-2); |
| 153 |
assertEquals(-2, ai.getAndIncrement()); |
| 154 |
assertEquals(-1, ai.getAndIncrement()); |
| 155 |
assertEquals(0, ai.getAndIncrement()); |
| 156 |
assertEquals(1, ai.get()); |
| 157 |
} |
| 158 |
|
| 159 |
/** |
| 160 |
* addAndGet adds given value to current, and returns current value |
| 161 |
*/ |
| 162 |
public void testAddAndGet() { |
| 163 |
AtomicLong ai = new AtomicLong(1); |
| 164 |
assertEquals(3, ai.addAndGet(2)); |
| 165 |
assertEquals(3, ai.get()); |
| 166 |
assertEquals(-1, ai.addAndGet(-4)); |
| 167 |
assertEquals(-1, ai.get()); |
| 168 |
} |
| 169 |
|
| 170 |
/** |
| 171 |
* decrementAndGet decrements and returns current value |
| 172 |
*/ |
| 173 |
public void testDecrementAndGet() { |
| 174 |
AtomicLong ai = new AtomicLong(1); |
| 175 |
assertEquals(0, ai.decrementAndGet()); |
| 176 |
assertEquals(-1, ai.decrementAndGet()); |
| 177 |
assertEquals(-2, ai.decrementAndGet()); |
| 178 |
assertEquals(-2, ai.get()); |
| 179 |
} |
| 180 |
|
| 181 |
/** |
| 182 |
* incrementAndGet increments and returns current value |
| 183 |
*/ |
| 184 |
public void testIncrementAndGet() { |
| 185 |
AtomicLong ai = new AtomicLong(1); |
| 186 |
assertEquals(2, ai.incrementAndGet()); |
| 187 |
assertEquals(2, ai.get()); |
| 188 |
ai.set(-2); |
| 189 |
assertEquals(-1, ai.incrementAndGet()); |
| 190 |
assertEquals(0, ai.incrementAndGet()); |
| 191 |
assertEquals(1, ai.incrementAndGet()); |
| 192 |
assertEquals(1, ai.get()); |
| 193 |
} |
| 194 |
|
| 195 |
/** |
| 196 |
* a deserialized serialized atomic holds same value |
| 197 |
*/ |
| 198 |
public void testSerialization() throws Exception { |
| 199 |
AtomicLong x = new AtomicLong(); |
| 200 |
AtomicLong y = serialClone(x); |
| 201 |
assertNotSame(x, y); |
| 202 |
x.set(-22); |
| 203 |
AtomicLong z = serialClone(x); |
| 204 |
assertNotSame(y, z); |
| 205 |
assertEquals(-22, x.get()); |
| 206 |
assertEquals(0, y.get()); |
| 207 |
assertEquals(-22, z.get()); |
| 208 |
} |
| 209 |
|
| 210 |
/** |
| 211 |
* toString returns current value. |
| 212 |
*/ |
| 213 |
public void testToString() { |
| 214 |
AtomicLong ai = new AtomicLong(); |
| 215 |
assertEquals("0", ai.toString()); |
| 216 |
for (long x : VALUES) { |
| 217 |
ai.set(x); |
| 218 |
assertEquals(Long.toString(x), ai.toString()); |
| 219 |
} |
| 220 |
} |
| 221 |
|
| 222 |
/** |
| 223 |
* intValue returns current value. |
| 224 |
*/ |
| 225 |
public void testIntValue() { |
| 226 |
AtomicLong ai = new AtomicLong(); |
| 227 |
assertEquals(0, ai.intValue()); |
| 228 |
for (long x : VALUES) { |
| 229 |
ai.set(x); |
| 230 |
assertEquals((int)x, ai.intValue()); |
| 231 |
} |
| 232 |
} |
| 233 |
|
| 234 |
/** |
| 235 |
* longValue returns current value. |
| 236 |
*/ |
| 237 |
public void testLongValue() { |
| 238 |
AtomicLong ai = new AtomicLong(); |
| 239 |
assertEquals(0L, ai.longValue()); |
| 240 |
for (long x : VALUES) { |
| 241 |
ai.set(x); |
| 242 |
assertEquals(x, ai.longValue()); |
| 243 |
} |
| 244 |
} |
| 245 |
|
| 246 |
/** |
| 247 |
* floatValue returns current value. |
| 248 |
*/ |
| 249 |
public void testFloatValue() { |
| 250 |
AtomicLong ai = new AtomicLong(); |
| 251 |
assertEquals(0.0f, ai.floatValue()); |
| 252 |
for (long x : VALUES) { |
| 253 |
ai.set(x); |
| 254 |
assertEquals((float)x, ai.floatValue()); |
| 255 |
} |
| 256 |
} |
| 257 |
|
| 258 |
/** |
| 259 |
* doubleValue returns current value. |
| 260 |
*/ |
| 261 |
public void testDoubleValue() { |
| 262 |
AtomicLong ai = new AtomicLong(); |
| 263 |
assertEquals(0.0d, ai.doubleValue()); |
| 264 |
for (long x : VALUES) { |
| 265 |
ai.set(x); |
| 266 |
assertEquals((double)x, ai.doubleValue()); |
| 267 |
} |
| 268 |
} |
| 269 |
|
| 270 |
// jdk9 |
| 271 |
|
| 272 |
/** |
| 273 |
* getPlain returns the last value set |
| 274 |
*/ |
| 275 |
public void testGetPlainSet() { |
| 276 |
AtomicLong ai = new AtomicLong(1); |
| 277 |
assertEquals(1, ai.getPlain()); |
| 278 |
ai.set(2); |
| 279 |
assertEquals(2, ai.getPlain()); |
| 280 |
ai.set(-3); |
| 281 |
assertEquals(-3, ai.getPlain()); |
| 282 |
} |
| 283 |
|
| 284 |
/** |
| 285 |
* getOpaque returns the last value set |
| 286 |
*/ |
| 287 |
public void testGetOpaqueSet() { |
| 288 |
AtomicLong ai = new AtomicLong(1); |
| 289 |
assertEquals(1, ai.getOpaque()); |
| 290 |
ai.set(2); |
| 291 |
assertEquals(2, ai.getOpaque()); |
| 292 |
ai.set(-3); |
| 293 |
assertEquals(-3, ai.getOpaque()); |
| 294 |
} |
| 295 |
|
| 296 |
/** |
| 297 |
* getAcquire returns the last value set |
| 298 |
*/ |
| 299 |
public void testGetAcquireSet() { |
| 300 |
AtomicLong ai = new AtomicLong(1); |
| 301 |
assertEquals(1, ai.getAcquire()); |
| 302 |
ai.set(2); |
| 303 |
assertEquals(2, ai.getAcquire()); |
| 304 |
ai.set(-3); |
| 305 |
assertEquals(-3, ai.getAcquire()); |
| 306 |
} |
| 307 |
|
| 308 |
/** |
| 309 |
* get returns the last value setPlain |
| 310 |
*/ |
| 311 |
public void testGetSetPlain() { |
| 312 |
AtomicLong ai = new AtomicLong(1); |
| 313 |
assertEquals(1, ai.get()); |
| 314 |
ai.setPlain(2); |
| 315 |
assertEquals(2, ai.get()); |
| 316 |
ai.setPlain(-3); |
| 317 |
assertEquals(-3, ai.get()); |
| 318 |
} |
| 319 |
|
| 320 |
/** |
| 321 |
* get returns the last value setOpaque |
| 322 |
*/ |
| 323 |
public void testGetSetOpaque() { |
| 324 |
AtomicLong ai = new AtomicLong(1); |
| 325 |
assertEquals(1, ai.get()); |
| 326 |
ai.setOpaque(2); |
| 327 |
assertEquals(2, ai.get()); |
| 328 |
ai.setOpaque(-3); |
| 329 |
assertEquals(-3, ai.get()); |
| 330 |
} |
| 331 |
|
| 332 |
/** |
| 333 |
* get returns the last value setRelease |
| 334 |
*/ |
| 335 |
public void testGetSetRelease() { |
| 336 |
AtomicLong ai = new AtomicLong(1); |
| 337 |
assertEquals(1, ai.get()); |
| 338 |
ai.setRelease(2); |
| 339 |
assertEquals(2, ai.get()); |
| 340 |
ai.setRelease(-3); |
| 341 |
assertEquals(-3, ai.get()); |
| 342 |
} |
| 343 |
|
| 344 |
/** |
| 345 |
* compareAndExchange succeeds in changing value if equal to |
| 346 |
* expected else fails |
| 347 |
*/ |
| 348 |
public void testCompareAndExchange() { |
| 349 |
AtomicLong ai = new AtomicLong(1); |
| 350 |
assertEquals(1, ai.compareAndExchange(1, 2)); |
| 351 |
assertEquals(2, ai.compareAndExchange(2, -4)); |
| 352 |
assertEquals(-4, ai.get()); |
| 353 |
assertEquals(-4, ai.compareAndExchange(-5, 7)); |
| 354 |
assertEquals(-4, ai.get()); |
| 355 |
assertEquals(-4, ai.compareAndExchange(-4, 7)); |
| 356 |
assertEquals(7, ai.get()); |
| 357 |
} |
| 358 |
|
| 359 |
/** |
| 360 |
* compareAndExchangeAcquire succeeds in changing value if equal to |
| 361 |
* expected else fails |
| 362 |
*/ |
| 363 |
public void testCompareAndExchangeAcquire() { |
| 364 |
AtomicLong ai = new AtomicLong(1); |
| 365 |
assertEquals(1, ai.compareAndExchangeAcquire(1, 2)); |
| 366 |
assertEquals(2, ai.compareAndExchangeAcquire(2, -4)); |
| 367 |
assertEquals(-4, ai.get()); |
| 368 |
assertEquals(-4, ai.compareAndExchangeAcquire(-5, 7)); |
| 369 |
assertEquals(-4, ai.get()); |
| 370 |
assertEquals(-4, ai.compareAndExchangeAcquire(-4, 7)); |
| 371 |
assertEquals(7, ai.get()); |
| 372 |
} |
| 373 |
|
| 374 |
/** |
| 375 |
* compareAndExchangeRelease succeeds in changing value if equal to |
| 376 |
* expected else fails |
| 377 |
*/ |
| 378 |
public void testCompareAndExchangeRelease() { |
| 379 |
AtomicLong ai = new AtomicLong(1); |
| 380 |
assertEquals(1, ai.compareAndExchangeRelease(1, 2)); |
| 381 |
assertEquals(2, ai.compareAndExchangeRelease(2, -4)); |
| 382 |
assertEquals(-4, ai.get()); |
| 383 |
assertEquals(-4, ai.compareAndExchangeRelease(-5, 7)); |
| 384 |
assertEquals(-4, ai.get()); |
| 385 |
assertEquals(-4, ai.compareAndExchangeRelease(-4, 7)); |
| 386 |
assertEquals(7, ai.get()); |
| 387 |
} |
| 388 |
|
| 389 |
/** |
| 390 |
* repeated weakCompareAndSetVolatile succeeds in changing value when equal |
| 391 |
* to expected |
| 392 |
*/ |
| 393 |
public void testWeakCompareAndSetVolatile() { |
| 394 |
AtomicLong ai = new AtomicLong(1); |
| 395 |
do {} while (!ai.weakCompareAndSetVolatile(1, 2)); |
| 396 |
do {} while (!ai.weakCompareAndSetVolatile(2, -4)); |
| 397 |
assertEquals(-4, ai.get()); |
| 398 |
do {} while (!ai.weakCompareAndSetVolatile(-4, 7)); |
| 399 |
assertEquals(7, ai.get()); |
| 400 |
} |
| 401 |
|
| 402 |
/** |
| 403 |
* repeated weakCompareAndSetAcquire succeeds in changing value when equal |
| 404 |
* to expected |
| 405 |
*/ |
| 406 |
public void testWeakCompareAndSetAcquire() { |
| 407 |
AtomicLong ai = new AtomicLong(1); |
| 408 |
do {} while (!ai.weakCompareAndSetAcquire(1, 2)); |
| 409 |
do {} while (!ai.weakCompareAndSetAcquire(2, -4)); |
| 410 |
assertEquals(-4, ai.get()); |
| 411 |
do {} while (!ai.weakCompareAndSetAcquire(-4, 7)); |
| 412 |
assertEquals(7, ai.get()); |
| 413 |
} |
| 414 |
|
| 415 |
/** |
| 416 |
* repeated weakCompareAndSetRelease succeeds in changing value when equal |
| 417 |
* to expected |
| 418 |
*/ |
| 419 |
public void testWeakCompareAndSetRelease() { |
| 420 |
AtomicLong ai = new AtomicLong(1); |
| 421 |
do {} while (!ai.weakCompareAndSetRelease(1, 2)); |
| 422 |
do {} while (!ai.weakCompareAndSetRelease(2, -4)); |
| 423 |
assertEquals(-4, ai.get()); |
| 424 |
do {} while (!ai.weakCompareAndSetRelease(-4, 7)); |
| 425 |
assertEquals(7, ai.get()); |
| 426 |
} |
| 427 |
|
| 428 |
} |
