| 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 junit.framework.*; |
| 10 |
import java.util.concurrent.atomic.*; |
| 11 |
import java.io.*; |
| 12 |
|
| 13 |
public class AtomicIntegerTest extends JSR166TestCase { |
| 14 |
public static void main(String[] args) { |
| 15 |
junit.textui.TestRunner.run(suite()); |
| 16 |
} |
| 17 |
public static Test suite() { |
| 18 |
return new TestSuite(AtomicIntegerTest.class); |
| 19 |
} |
| 20 |
|
| 21 |
final int[] VALUES = { |
| 22 |
Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE, |
| 23 |
}; |
| 24 |
|
| 25 |
/** |
| 26 |
* constructor initializes to given value |
| 27 |
*/ |
| 28 |
public void testConstructor() { |
| 29 |
AtomicInteger ai = new AtomicInteger(1); |
| 30 |
assertEquals(1,ai.get()); |
| 31 |
} |
| 32 |
|
| 33 |
/** |
| 34 |
* default constructed initializes to zero |
| 35 |
*/ |
| 36 |
public void testConstructor2() { |
| 37 |
AtomicInteger ai = new AtomicInteger(); |
| 38 |
assertEquals(0,ai.get()); |
| 39 |
} |
| 40 |
|
| 41 |
/** |
| 42 |
* get returns the last value set |
| 43 |
*/ |
| 44 |
public void testGetSet() { |
| 45 |
AtomicInteger ai = new AtomicInteger(1); |
| 46 |
assertEquals(1,ai.get()); |
| 47 |
ai.set(2); |
| 48 |
assertEquals(2,ai.get()); |
| 49 |
ai.set(-3); |
| 50 |
assertEquals(-3,ai.get()); |
| 51 |
} |
| 52 |
|
| 53 |
/** |
| 54 |
* get returns the last value lazySet in same thread |
| 55 |
*/ |
| 56 |
public void testGetLazySet() { |
| 57 |
AtomicInteger ai = new AtomicInteger(1); |
| 58 |
assertEquals(1,ai.get()); |
| 59 |
ai.lazySet(2); |
| 60 |
assertEquals(2,ai.get()); |
| 61 |
ai.lazySet(-3); |
| 62 |
assertEquals(-3,ai.get()); |
| 63 |
} |
| 64 |
|
| 65 |
/** |
| 66 |
* compareAndSet succeeds in changing value if equal to expected else fails |
| 67 |
*/ |
| 68 |
public void testCompareAndSet() { |
| 69 |
AtomicInteger ai = new AtomicInteger(1); |
| 70 |
assertTrue(ai.compareAndSet(1,2)); |
| 71 |
assertTrue(ai.compareAndSet(2,-4)); |
| 72 |
assertEquals(-4,ai.get()); |
| 73 |
assertFalse(ai.compareAndSet(-5,7)); |
| 74 |
assertEquals(-4,ai.get()); |
| 75 |
assertTrue(ai.compareAndSet(-4,7)); |
| 76 |
assertEquals(7,ai.get()); |
| 77 |
} |
| 78 |
|
| 79 |
/** |
| 80 |
* compareAndSet in one thread enables another waiting for value |
| 81 |
* to succeed |
| 82 |
*/ |
| 83 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
| 84 |
final AtomicInteger ai = new AtomicInteger(1); |
| 85 |
Thread t = new Thread(new CheckedRunnable() { |
| 86 |
public void realRun() { |
| 87 |
while (!ai.compareAndSet(2, 3)) |
| 88 |
Thread.yield(); |
| 89 |
}}); |
| 90 |
|
| 91 |
t.start(); |
| 92 |
assertTrue(ai.compareAndSet(1, 2)); |
| 93 |
t.join(LONG_DELAY_MS); |
| 94 |
assertFalse(t.isAlive()); |
| 95 |
assertEquals(ai.get(), 3); |
| 96 |
} |
| 97 |
|
| 98 |
/** |
| 99 |
* repeated weakCompareAndSet succeeds in changing value when equal |
| 100 |
* to expected |
| 101 |
*/ |
| 102 |
public void testWeakCompareAndSet() { |
| 103 |
AtomicInteger ai = new AtomicInteger(1); |
| 104 |
while (!ai.weakCompareAndSet(1,2)); |
| 105 |
while (!ai.weakCompareAndSet(2,-4)); |
| 106 |
assertEquals(-4,ai.get()); |
| 107 |
while (!ai.weakCompareAndSet(-4,7)); |
| 108 |
assertEquals(7,ai.get()); |
| 109 |
} |
| 110 |
|
| 111 |
/** |
| 112 |
* getAndSet returns previous value and sets to given value |
| 113 |
*/ |
| 114 |
public void testGetAndSet() { |
| 115 |
AtomicInteger ai = new AtomicInteger(1); |
| 116 |
assertEquals(1,ai.getAndSet(0)); |
| 117 |
assertEquals(0,ai.getAndSet(-10)); |
| 118 |
assertEquals(-10,ai.getAndSet(1)); |
| 119 |
} |
| 120 |
|
| 121 |
/** |
| 122 |
* getAndAdd returns previous value and adds given value |
| 123 |
*/ |
| 124 |
public void testGetAndAdd() { |
| 125 |
AtomicInteger ai = new AtomicInteger(1); |
| 126 |
assertEquals(1,ai.getAndAdd(2)); |
| 127 |
assertEquals(3,ai.get()); |
| 128 |
assertEquals(3,ai.getAndAdd(-4)); |
| 129 |
assertEquals(-1,ai.get()); |
| 130 |
} |
| 131 |
|
| 132 |
/** |
| 133 |
* getAndDecrement returns previous value and decrements |
| 134 |
*/ |
| 135 |
public void testGetAndDecrement() { |
| 136 |
AtomicInteger ai = new AtomicInteger(1); |
| 137 |
assertEquals(1,ai.getAndDecrement()); |
| 138 |
assertEquals(0,ai.getAndDecrement()); |
| 139 |
assertEquals(-1,ai.getAndDecrement()); |
| 140 |
} |
| 141 |
|
| 142 |
/** |
| 143 |
* getAndIncrement returns previous value and increments |
| 144 |
*/ |
| 145 |
public void testGetAndIncrement() { |
| 146 |
AtomicInteger ai = new AtomicInteger(1); |
| 147 |
assertEquals(1,ai.getAndIncrement()); |
| 148 |
assertEquals(2,ai.get()); |
| 149 |
ai.set(-2); |
| 150 |
assertEquals(-2,ai.getAndIncrement()); |
| 151 |
assertEquals(-1,ai.getAndIncrement()); |
| 152 |
assertEquals(0,ai.getAndIncrement()); |
| 153 |
assertEquals(1,ai.get()); |
| 154 |
} |
| 155 |
|
| 156 |
/** |
| 157 |
* addAndGet adds given value to current, and returns current value |
| 158 |
*/ |
| 159 |
public void testAddAndGet() { |
| 160 |
AtomicInteger ai = new AtomicInteger(1); |
| 161 |
assertEquals(3,ai.addAndGet(2)); |
| 162 |
assertEquals(3,ai.get()); |
| 163 |
assertEquals(-1,ai.addAndGet(-4)); |
| 164 |
assertEquals(-1,ai.get()); |
| 165 |
} |
| 166 |
|
| 167 |
/** |
| 168 |
* decrementAndGet decrements and returns current value |
| 169 |
*/ |
| 170 |
public void testDecrementAndGet() { |
| 171 |
AtomicInteger ai = new AtomicInteger(1); |
| 172 |
assertEquals(0,ai.decrementAndGet()); |
| 173 |
assertEquals(-1,ai.decrementAndGet()); |
| 174 |
assertEquals(-2,ai.decrementAndGet()); |
| 175 |
assertEquals(-2,ai.get()); |
| 176 |
} |
| 177 |
|
| 178 |
/** |
| 179 |
* incrementAndGet increments and returns current value |
| 180 |
*/ |
| 181 |
public void testIncrementAndGet() { |
| 182 |
AtomicInteger ai = new AtomicInteger(1); |
| 183 |
assertEquals(2,ai.incrementAndGet()); |
| 184 |
assertEquals(2,ai.get()); |
| 185 |
ai.set(-2); |
| 186 |
assertEquals(-1,ai.incrementAndGet()); |
| 187 |
assertEquals(0,ai.incrementAndGet()); |
| 188 |
assertEquals(1,ai.incrementAndGet()); |
| 189 |
assertEquals(1,ai.get()); |
| 190 |
} |
| 191 |
|
| 192 |
/** |
| 193 |
* a deserialized serialized atomic holds same value |
| 194 |
*/ |
| 195 |
public void testSerialization() throws Exception { |
| 196 |
AtomicInteger l = new AtomicInteger(); |
| 197 |
|
| 198 |
l.set(22); |
| 199 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
| 200 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
| 201 |
out.writeObject(l); |
| 202 |
out.close(); |
| 203 |
|
| 204 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
| 205 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
| 206 |
AtomicInteger r = (AtomicInteger) in.readObject(); |
| 207 |
assertEquals(l.get(), r.get()); |
| 208 |
} |
| 209 |
|
| 210 |
/** |
| 211 |
* toString returns current value. |
| 212 |
*/ |
| 213 |
public void testToString() { |
| 214 |
AtomicInteger ai = new AtomicInteger(); |
| 215 |
assertEquals("0", ai.toString()); |
| 216 |
for (int x : VALUES) { |
| 217 |
ai.set(x); |
| 218 |
assertEquals(ai.toString(), Integer.toString(x)); |
| 219 |
} |
| 220 |
} |
| 221 |
|
| 222 |
/** |
| 223 |
* intValue returns current value. |
| 224 |
*/ |
| 225 |
public void testIntValue() { |
| 226 |
AtomicInteger ai = new AtomicInteger(); |
| 227 |
assertEquals(0, ai.intValue()); |
| 228 |
for (int x : VALUES) { |
| 229 |
ai.set(x); |
| 230 |
assertEquals(x, ai.intValue()); |
| 231 |
} |
| 232 |
} |
| 233 |
|
| 234 |
/** |
| 235 |
* longValue returns current value. |
| 236 |
*/ |
| 237 |
public void testLongValue() { |
| 238 |
AtomicInteger ai = new AtomicInteger(); |
| 239 |
assertEquals(0L, ai.longValue()); |
| 240 |
for (int x : VALUES) { |
| 241 |
ai.set(x); |
| 242 |
assertEquals((long)x, ai.longValue()); |
| 243 |
} |
| 244 |
} |
| 245 |
|
| 246 |
/** |
| 247 |
* floatValue returns current value. |
| 248 |
*/ |
| 249 |
public void testFloatValue() { |
| 250 |
AtomicInteger ai = new AtomicInteger(); |
| 251 |
assertEquals(0.0f, ai.floatValue()); |
| 252 |
for (int 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 |
AtomicInteger ai = new AtomicInteger(); |
| 263 |
assertEquals(0.0d, ai.doubleValue()); |
| 264 |
for (int x : VALUES) { |
| 265 |
ai.set(x); |
| 266 |
assertEquals((double)x, ai.doubleValue()); |
| 267 |
} |
| 268 |
} |
| 269 |
|
| 270 |
} |
