Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 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 | package jsr166; |
| 10 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 11 | import java.util.concurrent.atomic.AtomicIntegerFieldUpdater; |
| 12 | |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 13 | import junit.framework.Test; |
| 14 | import junit.framework.TestSuite; |
| 15 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 16 | public class AtomicIntegerFieldUpdaterTest extends JSR166TestCase { |
| 17 | volatile int x = 0; |
| 18 | int w; |
| 19 | long z; |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 20 | // android-note: Removed because the CTS runner does a bad job of |
| 21 | // retrying tests that have suite() declarations. |
| 22 | // |
| 23 | // public static void main(String[] args) { |
| 24 | // main(suite(), args); |
| 25 | // } |
| 26 | // public static Test suite() { |
| 27 | // return new TestSuite(...); |
| 28 | // } |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 29 | |
| 30 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> updaterFor(String fieldName) { |
| 31 | return AtomicIntegerFieldUpdater.newUpdater |
| 32 | (AtomicIntegerFieldUpdaterTest.class, fieldName); |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * Construction with non-existent field throws RuntimeException |
| 37 | */ |
| 38 | public void testConstructor() { |
| 39 | try { |
| 40 | updaterFor("y"); |
| 41 | shouldThrow(); |
| 42 | } catch (RuntimeException success) { |
| 43 | assertNotNull(success.getCause()); |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * construction with field not of given type throws IllegalArgumentException |
| 49 | */ |
| 50 | public void testConstructor2() { |
| 51 | try { |
| 52 | updaterFor("z"); |
| 53 | shouldThrow(); |
| 54 | } catch (IllegalArgumentException success) {} |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * construction with non-volatile field throws IllegalArgumentException |
| 59 | */ |
| 60 | public void testConstructor3() { |
| 61 | try { |
| 62 | updaterFor("w"); |
| 63 | shouldThrow(); |
| 64 | } catch (IllegalArgumentException success) {} |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * get returns the last value set or assigned |
| 69 | */ |
| 70 | public void testGetSet() { |
| 71 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 72 | a = updaterFor("x"); |
| 73 | x = 1; |
| 74 | assertEquals(1, a.get(this)); |
| 75 | a.set(this, 2); |
| 76 | assertEquals(2, a.get(this)); |
| 77 | a.set(this, -3); |
| 78 | assertEquals(-3, a.get(this)); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * get returns the last value lazySet by same thread |
| 83 | */ |
| 84 | public void testGetLazySet() { |
| 85 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 86 | a = updaterFor("x"); |
| 87 | x = 1; |
| 88 | assertEquals(1, a.get(this)); |
| 89 | a.lazySet(this, 2); |
| 90 | assertEquals(2, a.get(this)); |
| 91 | a.lazySet(this, -3); |
| 92 | assertEquals(-3, a.get(this)); |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * compareAndSet succeeds in changing value if equal to expected else fails |
| 97 | */ |
| 98 | public void testCompareAndSet() { |
| 99 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 100 | a = updaterFor("x"); |
| 101 | x = 1; |
| 102 | assertTrue(a.compareAndSet(this, 1, 2)); |
| 103 | assertTrue(a.compareAndSet(this, 2, -4)); |
| 104 | assertEquals(-4, a.get(this)); |
| 105 | assertFalse(a.compareAndSet(this, -5, 7)); |
| 106 | assertEquals(-4, a.get(this)); |
| 107 | assertTrue(a.compareAndSet(this, -4, 7)); |
| 108 | assertEquals(7, a.get(this)); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * compareAndSet in one thread enables another waiting for value |
| 113 | * to succeed |
| 114 | */ |
| 115 | public void testCompareAndSetInMultipleThreads() throws Exception { |
| 116 | x = 1; |
| 117 | final AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 118 | a = updaterFor("x"); |
| 119 | |
| 120 | Thread t = new Thread(new CheckedRunnable() { |
| 121 | public void realRun() { |
| 122 | while (!a.compareAndSet(AtomicIntegerFieldUpdaterTest.this, 2, 3)) |
| 123 | Thread.yield(); |
| 124 | }}); |
| 125 | |
| 126 | t.start(); |
| 127 | assertTrue(a.compareAndSet(this, 1, 2)); |
| 128 | t.join(LONG_DELAY_MS); |
| 129 | assertFalse(t.isAlive()); |
| 130 | assertEquals(3, a.get(this)); |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * repeated weakCompareAndSet succeeds in changing value when equal |
| 135 | * to expected |
| 136 | */ |
| 137 | public void testWeakCompareAndSet() { |
| 138 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 139 | a = updaterFor("x"); |
| 140 | x = 1; |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 141 | do {} while (!a.weakCompareAndSet(this, 1, 2)); |
| 142 | do {} while (!a.weakCompareAndSet(this, 2, -4)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 143 | assertEquals(-4, a.get(this)); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 144 | do {} while (!a.weakCompareAndSet(this, -4, 7)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 145 | assertEquals(7, a.get(this)); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * getAndSet returns previous value and sets to given value |
| 150 | */ |
| 151 | public void testGetAndSet() { |
| 152 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 153 | a = updaterFor("x"); |
| 154 | x = 1; |
| 155 | assertEquals(1, a.getAndSet(this, 0)); |
| 156 | assertEquals(0, a.getAndSet(this, -10)); |
| 157 | assertEquals(-10, a.getAndSet(this, 1)); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * getAndAdd returns previous value and adds given value |
| 162 | */ |
| 163 | public void testGetAndAdd() { |
| 164 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 165 | a = updaterFor("x"); |
| 166 | x = 1; |
| 167 | assertEquals(1, a.getAndAdd(this, 2)); |
| 168 | assertEquals(3, a.get(this)); |
| 169 | assertEquals(3, a.getAndAdd(this, -4)); |
| 170 | assertEquals(-1, a.get(this)); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * getAndDecrement returns previous value and decrements |
| 175 | */ |
| 176 | public void testGetAndDecrement() { |
| 177 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 178 | a = updaterFor("x"); |
| 179 | x = 1; |
| 180 | assertEquals(1, a.getAndDecrement(this)); |
| 181 | assertEquals(0, a.getAndDecrement(this)); |
| 182 | assertEquals(-1, a.getAndDecrement(this)); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * getAndIncrement returns previous value and increments |
| 187 | */ |
| 188 | public void testGetAndIncrement() { |
| 189 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 190 | a = updaterFor("x"); |
| 191 | x = 1; |
| 192 | assertEquals(1, a.getAndIncrement(this)); |
| 193 | assertEquals(2, a.get(this)); |
| 194 | a.set(this, -2); |
| 195 | assertEquals(-2, a.getAndIncrement(this)); |
| 196 | assertEquals(-1, a.getAndIncrement(this)); |
| 197 | assertEquals(0, a.getAndIncrement(this)); |
| 198 | assertEquals(1, a.get(this)); |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * addAndGet adds given value to current, and returns current value |
| 203 | */ |
| 204 | public void testAddAndGet() { |
| 205 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 206 | a = updaterFor("x"); |
| 207 | x = 1; |
| 208 | assertEquals(3, a.addAndGet(this, 2)); |
| 209 | assertEquals(3, a.get(this)); |
| 210 | assertEquals(-1, a.addAndGet(this, -4)); |
| 211 | assertEquals(-1, a.get(this)); |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * decrementAndGet decrements and returns current value |
| 216 | */ |
| 217 | public void testDecrementAndGet() { |
| 218 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 219 | a = updaterFor("x"); |
| 220 | x = 1; |
| 221 | assertEquals(0, a.decrementAndGet(this)); |
| 222 | assertEquals(-1, a.decrementAndGet(this)); |
| 223 | assertEquals(-2, a.decrementAndGet(this)); |
| 224 | assertEquals(-2, a.get(this)); |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * incrementAndGet increments and returns current value |
| 229 | */ |
| 230 | public void testIncrementAndGet() { |
| 231 | AtomicIntegerFieldUpdater<AtomicIntegerFieldUpdaterTest> a; |
| 232 | a = updaterFor("x"); |
| 233 | x = 1; |
| 234 | assertEquals(2, a.incrementAndGet(this)); |
| 235 | assertEquals(2, a.get(this)); |
| 236 | a.set(this, -2); |
| 237 | assertEquals(-1, a.incrementAndGet(this)); |
| 238 | assertEquals(0, a.incrementAndGet(this)); |
| 239 | assertEquals(1, a.incrementAndGet(this)); |
| 240 | assertEquals(1, a.get(this)); |
| 241 | } |
| 242 | |
| 243 | } |