| /* |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| * Other contributors include Andrew Wright, Jeffrey Hayes, |
| * Pat Fisher, Mike Judd. |
| */ |
| |
| package jsr166; |
| |
| import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| |
| import java.util.concurrent.CountDownLatch; |
| |
| import junit.framework.Test; |
| import junit.framework.TestSuite; |
| |
| public class CountDownLatchTest extends JSR166TestCase { |
| // android-note: Removed because the CTS runner does a bad job of |
| // retrying tests that have suite() declarations. |
| // |
| // public static void main(String[] args) { |
| // main(suite(), args); |
| // } |
| // public static Test suite() { |
| // return new TestSuite(CountDownLatchTest.class); |
| // } |
| |
| /** |
| * negative constructor argument throws IAE |
| */ |
| public void testConstructor() { |
| try { |
| new CountDownLatch(-1); |
| shouldThrow(); |
| } catch (IllegalArgumentException success) {} |
| } |
| |
| /** |
| * getCount returns initial count and decreases after countDown |
| */ |
| public void testGetCount() { |
| final CountDownLatch l = new CountDownLatch(2); |
| assertEquals(2, l.getCount()); |
| l.countDown(); |
| assertEquals(1, l.getCount()); |
| } |
| |
| /** |
| * countDown decrements count when positive and has no effect when zero |
| */ |
| public void testCountDown() { |
| final CountDownLatch l = new CountDownLatch(1); |
| assertEquals(1, l.getCount()); |
| l.countDown(); |
| assertEquals(0, l.getCount()); |
| l.countDown(); |
| assertEquals(0, l.getCount()); |
| } |
| |
| /** |
| * await returns after countDown to zero, but not before |
| */ |
| public void testAwait() { |
| final CountDownLatch l = new CountDownLatch(2); |
| final CountDownLatch pleaseCountDown = new CountDownLatch(1); |
| |
| Thread t = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| assertEquals(2, l.getCount()); |
| pleaseCountDown.countDown(); |
| l.await(); |
| assertEquals(0, l.getCount()); |
| }}); |
| |
| await(pleaseCountDown); |
| assertEquals(2, l.getCount()); |
| l.countDown(); |
| assertEquals(1, l.getCount()); |
| assertThreadStaysAlive(t); |
| l.countDown(); |
| assertEquals(0, l.getCount()); |
| awaitTermination(t); |
| } |
| |
| /** |
| * timed await returns after countDown to zero |
| */ |
| public void testTimedAwait() { |
| final CountDownLatch l = new CountDownLatch(2); |
| final CountDownLatch pleaseCountDown = new CountDownLatch(1); |
| |
| Thread t = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| assertEquals(2, l.getCount()); |
| pleaseCountDown.countDown(); |
| assertTrue(l.await(LONG_DELAY_MS, MILLISECONDS)); |
| assertEquals(0, l.getCount()); |
| }}); |
| |
| await(pleaseCountDown); |
| assertEquals(2, l.getCount()); |
| l.countDown(); |
| assertEquals(1, l.getCount()); |
| assertThreadStaysAlive(t); |
| l.countDown(); |
| assertEquals(0, l.getCount()); |
| awaitTermination(t); |
| } |
| |
| /** |
| * await throws IE if interrupted before counted down |
| */ |
| public void testAwait_Interruptible() { |
| final CountDownLatch l = new CountDownLatch(1); |
| final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| Thread t = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| Thread.currentThread().interrupt(); |
| try { |
| l.await(); |
| shouldThrow(); |
| } catch (InterruptedException success) {} |
| assertFalse(Thread.interrupted()); |
| |
| pleaseInterrupt.countDown(); |
| try { |
| l.await(); |
| shouldThrow(); |
| } catch (InterruptedException success) {} |
| assertFalse(Thread.interrupted()); |
| |
| assertEquals(1, l.getCount()); |
| }}); |
| |
| await(pleaseInterrupt); |
| assertThreadStaysAlive(t); |
| t.interrupt(); |
| awaitTermination(t); |
| } |
| |
| /** |
| * timed await throws IE if interrupted before counted down |
| */ |
| public void testTimedAwait_Interruptible() { |
| final CountDownLatch l = new CountDownLatch(1); |
| final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| Thread t = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| Thread.currentThread().interrupt(); |
| try { |
| l.await(LONG_DELAY_MS, MILLISECONDS); |
| shouldThrow(); |
| } catch (InterruptedException success) {} |
| assertFalse(Thread.interrupted()); |
| |
| pleaseInterrupt.countDown(); |
| try { |
| l.await(LONG_DELAY_MS, MILLISECONDS); |
| shouldThrow(); |
| } catch (InterruptedException success) {} |
| assertFalse(Thread.interrupted()); |
| |
| assertEquals(1, l.getCount()); |
| }}); |
| |
| await(pleaseInterrupt); |
| assertThreadStaysAlive(t); |
| t.interrupt(); |
| awaitTermination(t); |
| } |
| |
| /** |
| * timed await times out if not counted down before timeout |
| */ |
| public void testAwaitTimeout() throws InterruptedException { |
| final CountDownLatch l = new CountDownLatch(1); |
| Thread t = newStartedThread(new CheckedRunnable() { |
| public void realRun() throws InterruptedException { |
| assertEquals(1, l.getCount()); |
| assertFalse(l.await(timeoutMillis(), MILLISECONDS)); |
| assertEquals(1, l.getCount()); |
| }}); |
| |
| awaitTermination(t); |
| assertEquals(1, l.getCount()); |
| } |
| |
| /** |
| * toString indicates current count |
| */ |
| public void testToString() { |
| CountDownLatch s = new CountDownLatch(2); |
| assertTrue(s.toString().contains("Count = 2")); |
| s.countDown(); |
| assertTrue(s.toString().contains("Count = 1")); |
| s.countDown(); |
| assertTrue(s.toString().contains("Count = 0")); |
| } |
| |
| } |