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