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.AtomicReferenceFieldUpdater; |
| 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 AtomicReferenceFieldUpdaterTest extends JSR166TestCase { |
| 17 | volatile Integer x = null; |
| 18 | Object z; |
| 19 | Integer w; |
| 20 | volatile int i; |
| 21 | |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 22 | // android-note: Removed because the CTS runner does a bad job of |
| 23 | // retrying tests that have suite() declarations. |
| 24 | // |
| 25 | // public static void main(String[] args) { |
| 26 | // main(suite(), args); |
| 27 | // } |
| 28 | // public static Test suite() { |
| 29 | // return new TestSuite(...); |
| 30 | // } |
| 31 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 32 | AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) { |
| 33 | return AtomicReferenceFieldUpdater.newUpdater |
| 34 | (AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName); |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Construction with non-existent field throws RuntimeException |
| 39 | */ |
| 40 | public void testConstructor() { |
| 41 | try { |
| 42 | updaterFor("y"); |
| 43 | shouldThrow(); |
| 44 | } catch (RuntimeException success) { |
| 45 | assertNotNull(success.getCause()); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * construction with field not of given type throws ClassCastException |
| 51 | */ |
| 52 | public void testConstructor2() { |
| 53 | try { |
| 54 | updaterFor("z"); |
| 55 | shouldThrow(); |
| 56 | } catch (ClassCastException success) {} |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Constructor with non-volatile field throws IllegalArgumentException |
| 61 | */ |
| 62 | public void testConstructor3() { |
| 63 | try { |
| 64 | updaterFor("w"); |
| 65 | shouldThrow(); |
| 66 | } catch (IllegalArgumentException success) {} |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Constructor with non-reference field throws ClassCastException |
| 71 | */ |
| 72 | public void testConstructor4() { |
| 73 | try { |
| 74 | updaterFor("i"); |
| 75 | shouldThrow(); |
| 76 | } catch (ClassCastException success) {} |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * get returns the last value set or assigned |
| 81 | */ |
| 82 | public void testGetSet() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 83 | AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 84 | a = updaterFor("x"); |
| 85 | x = one; |
| 86 | assertSame(one, a.get(this)); |
| 87 | a.set(this, two); |
| 88 | assertSame(two, a.get(this)); |
| 89 | a.set(this, m3); |
| 90 | assertSame(m3, a.get(this)); |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * get returns the last value lazySet by same thread |
| 95 | */ |
| 96 | public void testGetLazySet() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 97 | AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 98 | a = updaterFor("x"); |
| 99 | x = one; |
| 100 | assertSame(one, a.get(this)); |
| 101 | a.lazySet(this, two); |
| 102 | assertSame(two, a.get(this)); |
| 103 | a.lazySet(this, m3); |
| 104 | assertSame(m3, a.get(this)); |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * compareAndSet succeeds in changing value if equal to expected else fails |
| 109 | */ |
| 110 | public void testCompareAndSet() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 111 | AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 112 | a = updaterFor("x"); |
| 113 | x = one; |
| 114 | assertTrue(a.compareAndSet(this, one, two)); |
| 115 | assertTrue(a.compareAndSet(this, two, m4)); |
| 116 | assertSame(m4, a.get(this)); |
| 117 | assertFalse(a.compareAndSet(this, m5, seven)); |
| 118 | assertFalse(seven == a.get(this)); |
| 119 | assertTrue(a.compareAndSet(this, m4, seven)); |
| 120 | assertSame(seven, a.get(this)); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * compareAndSet in one thread enables another waiting for value |
| 125 | * to succeed |
| 126 | */ |
| 127 | public void testCompareAndSetInMultipleThreads() throws Exception { |
| 128 | x = one; |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 129 | final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 130 | a = updaterFor("x"); |
| 131 | |
| 132 | Thread t = new Thread(new CheckedRunnable() { |
| 133 | public void realRun() { |
| 134 | while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three)) |
| 135 | Thread.yield(); |
| 136 | }}); |
| 137 | |
| 138 | t.start(); |
| 139 | assertTrue(a.compareAndSet(this, one, two)); |
| 140 | t.join(LONG_DELAY_MS); |
| 141 | assertFalse(t.isAlive()); |
| 142 | assertSame(three, a.get(this)); |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * repeated weakCompareAndSet succeeds in changing value when equal |
| 147 | * to expected |
| 148 | */ |
| 149 | public void testWeakCompareAndSet() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 150 | AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 151 | a = updaterFor("x"); |
| 152 | x = one; |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 153 | do {} while (!a.weakCompareAndSet(this, one, two)); |
| 154 | do {} while (!a.weakCompareAndSet(this, two, m4)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 155 | assertSame(m4, a.get(this)); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 156 | do {} while (!a.weakCompareAndSet(this, m4, seven)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 157 | assertSame(seven, a.get(this)); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * getAndSet returns previous value and sets to given value |
| 162 | */ |
| 163 | public void testGetAndSet() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 164 | AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> a; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 165 | a = updaterFor("x"); |
| 166 | x = one; |
| 167 | assertSame(one, a.getAndSet(this, zero)); |
| 168 | assertSame(zero, a.getAndSet(this, m10)); |
| 169 | assertSame(m10, a.getAndSet(this, 1)); |
| 170 | } |
| 171 | |
| 172 | } |