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 static java.util.concurrent.TimeUnit.MILLISECONDS; |
| 12 | |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 13 | import java.util.concurrent.CountDownLatch; |
| 14 | |
| 15 | import junit.framework.Test; |
| 16 | import junit.framework.TestSuite; |
| 17 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 18 | public class CountDownLatchTest extends JSR166TestCase { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 19 | // android-note: Removed because the CTS runner does a bad job of |
| 20 | // retrying tests that have suite() declarations. |
| 21 | // |
| 22 | // public static void main(String[] args) { |
| 23 | // main(suite(), args); |
| 24 | // } |
| 25 | // public static Test suite() { |
| 26 | // return new TestSuite(...); |
| 27 | // } |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 28 | |
| 29 | /** |
| 30 | * negative constructor argument throws IAE |
| 31 | */ |
| 32 | public void testConstructor() { |
| 33 | try { |
| 34 | new CountDownLatch(-1); |
| 35 | shouldThrow(); |
| 36 | } catch (IllegalArgumentException success) {} |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * getCount returns initial count and decreases after countDown |
| 41 | */ |
| 42 | public void testGetCount() { |
| 43 | final CountDownLatch l = new CountDownLatch(2); |
| 44 | assertEquals(2, l.getCount()); |
| 45 | l.countDown(); |
| 46 | assertEquals(1, l.getCount()); |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * countDown decrements count when positive and has no effect when zero |
| 51 | */ |
| 52 | public void testCountDown() { |
| 53 | final CountDownLatch l = new CountDownLatch(1); |
| 54 | assertEquals(1, l.getCount()); |
| 55 | l.countDown(); |
| 56 | assertEquals(0, l.getCount()); |
| 57 | l.countDown(); |
| 58 | assertEquals(0, l.getCount()); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * await returns after countDown to zero, but not before |
| 63 | */ |
| 64 | public void testAwait() { |
| 65 | final CountDownLatch l = new CountDownLatch(2); |
| 66 | final CountDownLatch pleaseCountDown = new CountDownLatch(1); |
| 67 | |
| 68 | Thread t = newStartedThread(new CheckedRunnable() { |
| 69 | public void realRun() throws InterruptedException { |
| 70 | assertEquals(2, l.getCount()); |
| 71 | pleaseCountDown.countDown(); |
| 72 | l.await(); |
| 73 | assertEquals(0, l.getCount()); |
| 74 | }}); |
| 75 | |
| 76 | await(pleaseCountDown); |
| 77 | assertEquals(2, l.getCount()); |
| 78 | l.countDown(); |
| 79 | assertEquals(1, l.getCount()); |
| 80 | assertThreadStaysAlive(t); |
| 81 | l.countDown(); |
| 82 | assertEquals(0, l.getCount()); |
| 83 | awaitTermination(t); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * timed await returns after countDown to zero |
| 88 | */ |
| 89 | public void testTimedAwait() { |
| 90 | final CountDownLatch l = new CountDownLatch(2); |
| 91 | final CountDownLatch pleaseCountDown = new CountDownLatch(1); |
| 92 | |
| 93 | Thread t = newStartedThread(new CheckedRunnable() { |
| 94 | public void realRun() throws InterruptedException { |
| 95 | assertEquals(2, l.getCount()); |
| 96 | pleaseCountDown.countDown(); |
| 97 | assertTrue(l.await(LONG_DELAY_MS, MILLISECONDS)); |
| 98 | assertEquals(0, l.getCount()); |
| 99 | }}); |
| 100 | |
| 101 | await(pleaseCountDown); |
| 102 | assertEquals(2, l.getCount()); |
| 103 | l.countDown(); |
| 104 | assertEquals(1, l.getCount()); |
| 105 | assertThreadStaysAlive(t); |
| 106 | l.countDown(); |
| 107 | assertEquals(0, l.getCount()); |
| 108 | awaitTermination(t); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * await throws IE if interrupted before counted down |
| 113 | */ |
| 114 | public void testAwait_Interruptible() { |
| 115 | final CountDownLatch l = new CountDownLatch(1); |
| 116 | final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| 117 | Thread t = newStartedThread(new CheckedRunnable() { |
| 118 | public void realRun() throws InterruptedException { |
| 119 | Thread.currentThread().interrupt(); |
| 120 | try { |
| 121 | l.await(); |
| 122 | shouldThrow(); |
| 123 | } catch (InterruptedException success) {} |
| 124 | assertFalse(Thread.interrupted()); |
| 125 | |
| 126 | pleaseInterrupt.countDown(); |
| 127 | try { |
| 128 | l.await(); |
| 129 | shouldThrow(); |
| 130 | } catch (InterruptedException success) {} |
| 131 | assertFalse(Thread.interrupted()); |
| 132 | |
| 133 | assertEquals(1, l.getCount()); |
| 134 | }}); |
| 135 | |
| 136 | await(pleaseInterrupt); |
| 137 | assertThreadStaysAlive(t); |
| 138 | t.interrupt(); |
| 139 | awaitTermination(t); |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * timed await throws IE if interrupted before counted down |
| 144 | */ |
| 145 | public void testTimedAwait_Interruptible() { |
| 146 | final CountDownLatch l = new CountDownLatch(1); |
| 147 | final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| 148 | Thread t = newStartedThread(new CheckedRunnable() { |
| 149 | public void realRun() throws InterruptedException { |
| 150 | Thread.currentThread().interrupt(); |
| 151 | try { |
| 152 | l.await(LONG_DELAY_MS, MILLISECONDS); |
| 153 | shouldThrow(); |
| 154 | } catch (InterruptedException success) {} |
| 155 | assertFalse(Thread.interrupted()); |
| 156 | |
| 157 | pleaseInterrupt.countDown(); |
| 158 | try { |
| 159 | l.await(LONG_DELAY_MS, MILLISECONDS); |
| 160 | shouldThrow(); |
| 161 | } catch (InterruptedException success) {} |
| 162 | assertFalse(Thread.interrupted()); |
| 163 | |
| 164 | assertEquals(1, l.getCount()); |
| 165 | }}); |
| 166 | |
| 167 | await(pleaseInterrupt); |
| 168 | assertThreadStaysAlive(t); |
| 169 | t.interrupt(); |
| 170 | awaitTermination(t); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * timed await times out if not counted down before timeout |
| 175 | */ |
| 176 | public void testAwaitTimeout() throws InterruptedException { |
| 177 | final CountDownLatch l = new CountDownLatch(1); |
| 178 | Thread t = newStartedThread(new CheckedRunnable() { |
| 179 | public void realRun() throws InterruptedException { |
| 180 | assertEquals(1, l.getCount()); |
| 181 | assertFalse(l.await(timeoutMillis(), MILLISECONDS)); |
| 182 | assertEquals(1, l.getCount()); |
| 183 | }}); |
| 184 | |
| 185 | awaitTermination(t); |
| 186 | assertEquals(1, l.getCount()); |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * toString indicates current count |
| 191 | */ |
| 192 | public void testToString() { |
| 193 | CountDownLatch s = new CountDownLatch(2); |
| 194 | assertTrue(s.toString().contains("Count = 2")); |
| 195 | s.countDown(); |
| 196 | assertTrue(s.toString().contains("Count = 1")); |
| 197 | s.countDown(); |
| 198 | assertTrue(s.toString().contains("Count = 0")); |
| 199 | } |
| 200 | |
| 201 | } |