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 | |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 11 | import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| 12 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 13 | import java.util.concurrent.CountDownLatch; |
| 14 | import java.util.concurrent.Exchanger; |
| 15 | import java.util.concurrent.TimeoutException; |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 16 | |
| 17 | import junit.framework.Test; |
| 18 | import junit.framework.TestSuite; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 19 | |
| 20 | public class ExchangerTest extends JSR166TestCase { |
| 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 | /** |
| 33 | * exchange exchanges objects across two threads |
| 34 | */ |
| 35 | public void testExchange() { |
| 36 | final Exchanger e = new Exchanger(); |
| 37 | Thread t1 = newStartedThread(new CheckedRunnable() { |
| 38 | public void realRun() throws InterruptedException { |
| 39 | assertSame(one, e.exchange(two)); |
| 40 | assertSame(two, e.exchange(one)); |
| 41 | }}); |
| 42 | Thread t2 = newStartedThread(new CheckedRunnable() { |
| 43 | public void realRun() throws InterruptedException { |
| 44 | assertSame(two, e.exchange(one)); |
| 45 | assertSame(one, e.exchange(two)); |
| 46 | }}); |
| 47 | |
| 48 | awaitTermination(t1); |
| 49 | awaitTermination(t2); |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * timed exchange exchanges objects across two threads |
| 54 | */ |
| 55 | public void testTimedExchange() { |
| 56 | final Exchanger e = new Exchanger(); |
| 57 | Thread t1 = newStartedThread(new CheckedRunnable() { |
| 58 | public void realRun() throws Exception { |
| 59 | assertSame(one, e.exchange(two, LONG_DELAY_MS, MILLISECONDS)); |
| 60 | assertSame(two, e.exchange(one, LONG_DELAY_MS, MILLISECONDS)); |
| 61 | }}); |
| 62 | Thread t2 = newStartedThread(new CheckedRunnable() { |
| 63 | public void realRun() throws Exception { |
| 64 | assertSame(two, e.exchange(one, LONG_DELAY_MS, MILLISECONDS)); |
| 65 | assertSame(one, e.exchange(two, LONG_DELAY_MS, MILLISECONDS)); |
| 66 | }}); |
| 67 | |
| 68 | awaitTermination(t1); |
| 69 | awaitTermination(t2); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * interrupt during wait for exchange throws IE |
| 74 | */ |
| 75 | public void testExchange_InterruptedException() { |
| 76 | final Exchanger e = new Exchanger(); |
| 77 | final CountDownLatch threadStarted = new CountDownLatch(1); |
| 78 | Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
| 79 | public void realRun() throws InterruptedException { |
| 80 | threadStarted.countDown(); |
| 81 | e.exchange(one); |
| 82 | }}); |
| 83 | |
| 84 | await(threadStarted); |
| 85 | t.interrupt(); |
| 86 | awaitTermination(t); |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * interrupt during wait for timed exchange throws IE |
| 91 | */ |
| 92 | public void testTimedExchange_InterruptedException() { |
| 93 | final Exchanger e = new Exchanger(); |
| 94 | final CountDownLatch threadStarted = new CountDownLatch(1); |
| 95 | Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
| 96 | public void realRun() throws Exception { |
| 97 | threadStarted.countDown(); |
| 98 | e.exchange(null, LONG_DELAY_MS, MILLISECONDS); |
| 99 | }}); |
| 100 | |
| 101 | await(threadStarted); |
| 102 | t.interrupt(); |
| 103 | awaitTermination(t); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * timeout during wait for timed exchange throws TimeoutException |
| 108 | */ |
| 109 | public void testExchange_TimeoutException() { |
| 110 | final Exchanger e = new Exchanger(); |
| 111 | Thread t = newStartedThread(new CheckedRunnable() { |
| 112 | public void realRun() throws Exception { |
| 113 | long startTime = System.nanoTime(); |
| 114 | try { |
| 115 | e.exchange(null, timeoutMillis(), MILLISECONDS); |
| 116 | shouldThrow(); |
| 117 | } catch (TimeoutException success) {} |
| 118 | assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
| 119 | }}); |
| 120 | |
| 121 | awaitTermination(t); |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * If one exchanging thread is interrupted, another succeeds. |
| 126 | */ |
| 127 | public void testReplacementAfterExchange() { |
| 128 | final Exchanger e = new Exchanger(); |
| 129 | final CountDownLatch exchanged = new CountDownLatch(2); |
| 130 | final CountDownLatch interrupted = new CountDownLatch(1); |
| 131 | Thread t1 = newStartedThread(new CheckedInterruptedRunnable() { |
| 132 | public void realRun() throws InterruptedException { |
| 133 | assertSame(two, e.exchange(one)); |
| 134 | exchanged.countDown(); |
| 135 | e.exchange(two); |
| 136 | }}); |
| 137 | Thread t2 = newStartedThread(new CheckedRunnable() { |
| 138 | public void realRun() throws InterruptedException { |
| 139 | assertSame(one, e.exchange(two)); |
| 140 | exchanged.countDown(); |
| 141 | interrupted.await(); |
| 142 | assertSame(three, e.exchange(one)); |
| 143 | }}); |
| 144 | Thread t3 = newStartedThread(new CheckedRunnable() { |
| 145 | public void realRun() throws InterruptedException { |
| 146 | interrupted.await(); |
| 147 | assertSame(one, e.exchange(three)); |
| 148 | }}); |
| 149 | |
| 150 | await(exchanged); |
| 151 | t1.interrupt(); |
| 152 | awaitTermination(t1); |
| 153 | interrupted.countDown(); |
| 154 | awaitTermination(t2); |
| 155 | awaitTermination(t3); |
| 156 | } |
| 157 | |
| 158 | } |