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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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import junit.framework.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import java.util.concurrent.CountDownLatch; |
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|
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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public class CountDownLatchTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(CountDownLatchTest.class); |
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return new TestSuite(CountDownLatchTest.class); |
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} |
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/** |
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* negative constructor argument throws IAE |
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* negative constructor argument throws IllegalArgumentException |
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*/ |
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public void testConstructor() { |
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try { |
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new CountDownLatch(-1); |
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shouldThrow(); |
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} catch(IllegalArgumentException success){} |
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} catch (IllegalArgumentException success) {} |
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} |
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|
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/** |
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* getCount returns initial count and decreases after countDown |
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*/ |
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public void testGetCount() { |
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final CountDownLatch l = new CountDownLatch(2); |
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assertEquals(2, l.getCount()); |
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l.countDown(); |
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assertEquals(1, l.getCount()); |
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final CountDownLatch l = new CountDownLatch(2); |
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assertEquals(2, l.getCount()); |
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l.countDown(); |
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assertEquals(1, l.getCount()); |
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} |
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|
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/** |
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* countDown decrements count when positive and has no effect when zero |
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*/ |
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public void testCountDown() { |
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final CountDownLatch l = new CountDownLatch(1); |
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assertEquals(1, l.getCount()); |
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l.countDown(); |
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assertEquals(0, l.getCount()); |
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l.countDown(); |
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assertEquals(0, l.getCount()); |
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final CountDownLatch l = new CountDownLatch(1); |
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assertEquals(1, l.getCount()); |
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l.countDown(); |
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assertEquals(0, l.getCount()); |
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l.countDown(); |
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assertEquals(0, l.getCount()); |
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} |
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|
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/** |
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* await returns after countDown to zero, but not before |
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*/ |
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public void testAwait() { |
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final CountDownLatch l = new CountDownLatch(2); |
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final CountDownLatch l = new CountDownLatch(2); |
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final CountDownLatch pleaseCountDown = new CountDownLatch(1); |
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|
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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try { |
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threadAssertTrue(l.getCount() > 0); |
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l.await(); |
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threadAssertTrue(l.getCount() == 0); |
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} catch(InterruptedException e){ |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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t.start(); |
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try { |
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assertEquals(l.getCount(), 2); |
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Thread.sleep(SHORT_DELAY_MS); |
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l.countDown(); |
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assertEquals(l.getCount(), 1); |
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l.countDown(); |
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assertEquals(l.getCount(), 0); |
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t.join(); |
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} catch (InterruptedException e){ |
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unexpectedException(); |
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} |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws InterruptedException { |
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assertEquals(2, l.getCount()); |
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pleaseCountDown.countDown(); |
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l.await(); |
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assertEquals(0, l.getCount()); |
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}}); |
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|
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await(pleaseCountDown); |
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assertEquals(2, l.getCount()); |
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l.countDown(); |
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assertEquals(1, l.getCount()); |
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assertThreadBlocks(t, Thread.State.WAITING); |
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l.countDown(); |
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assertEquals(0, l.getCount()); |
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awaitTermination(t); |
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} |
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– |
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/** |
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* timed await returns after countDown to zero |
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*/ |
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public void testTimedAwait() { |
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final CountDownLatch l = new CountDownLatch(2); |
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final CountDownLatch l = new CountDownLatch(2); |
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final CountDownLatch pleaseCountDown = new CountDownLatch(1); |
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|
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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try { |
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threadAssertTrue(l.getCount() > 0); |
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threadAssertTrue(l.await(SMALL_DELAY_MS, TimeUnit.MILLISECONDS)); |
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} catch(InterruptedException e){ |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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t.start(); |
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try { |
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assertEquals(l.getCount(), 2); |
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Thread.sleep(SHORT_DELAY_MS); |
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l.countDown(); |
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assertEquals(l.getCount(), 1); |
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l.countDown(); |
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assertEquals(l.getCount(), 0); |
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t.join(); |
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} catch (InterruptedException e){ |
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unexpectedException(); |
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} |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws InterruptedException { |
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assertEquals(2, l.getCount()); |
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pleaseCountDown.countDown(); |
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assertTrue(l.await(LONG_DELAY_MS, MILLISECONDS)); |
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assertEquals(0, l.getCount()); |
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}}); |
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|
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await(pleaseCountDown); |
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assertEquals(2, l.getCount()); |
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l.countDown(); |
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assertEquals(1, l.getCount()); |
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assertThreadBlocks(t, Thread.State.TIMED_WAITING); |
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l.countDown(); |
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assertEquals(0, l.getCount()); |
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awaitTermination(t); |
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} |
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|
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|
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/** |
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* await throws IE if interrupted before counted down |
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* await throws InterruptedException if interrupted before counted down |
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*/ |
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public void testAwait_InterruptedException() { |
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public void testAwait_Interruptible() { |
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final CountDownLatch l = new CountDownLatch(1); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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try { |
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threadAssertTrue(l.getCount() > 0); |
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l.await(); |
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threadShouldThrow(); |
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} catch(InterruptedException success){} |
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} |
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}); |
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t.start(); |
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try { |
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assertEquals(l.getCount(), 1); |
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t.interrupt(); |
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t.join(); |
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} catch (InterruptedException e){ |
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unexpectedException(); |
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} |
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final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws InterruptedException { |
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Thread.currentThread().interrupt(); |
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try { |
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l.await(); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
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assertFalse(Thread.interrupted()); |
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|
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pleaseInterrupt.countDown(); |
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try { |
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l.await(); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
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assertFalse(Thread.interrupted()); |
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|
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assertEquals(1, l.getCount()); |
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}}); |
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|
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await(pleaseInterrupt); |
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assertThreadBlocks(t, Thread.State.WAITING); |
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t.interrupt(); |
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awaitTermination(t); |
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} |
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/** |
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* timed await throws IE if interrupted before counted down |
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* timed await throws InterruptedException if interrupted before counted down |
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*/ |
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public void testTimedAwait_InterruptedException() { |
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public void testTimedAwait_Interruptible() { |
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final CountDownLatch l = new CountDownLatch(1); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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try { |
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threadAssertTrue(l.getCount() > 0); |
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l.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS); |
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threadShouldThrow(); |
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} catch(InterruptedException success){} |
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} |
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}); |
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t.start(); |
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try { |
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Thread.sleep(SHORT_DELAY_MS); |
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assertEquals(l.getCount(), 1); |
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t.interrupt(); |
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t.join(); |
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} catch (InterruptedException e){ |
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unexpectedException(); |
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} |
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final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws InterruptedException { |
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Thread.currentThread().interrupt(); |
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try { |
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l.await(LONG_DELAY_MS, MILLISECONDS); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
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assertFalse(Thread.interrupted()); |
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|
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pleaseInterrupt.countDown(); |
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try { |
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l.await(LONG_DELAY_MS, MILLISECONDS); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
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assertFalse(Thread.interrupted()); |
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|
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assertEquals(1, l.getCount()); |
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}}); |
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|
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await(pleaseInterrupt); |
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assertThreadBlocks(t, Thread.State.TIMED_WAITING); |
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t.interrupt(); |
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awaitTermination(t); |
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} |
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|
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/** |
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* timed await times out if not counted down before timeout |
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*/ |
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public void testAwaitTimeout() { |
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public void testAwaitTimeout() throws InterruptedException { |
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final CountDownLatch l = new CountDownLatch(1); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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try { |
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threadAssertTrue(l.getCount() > 0); |
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threadAssertFalse(l.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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threadAssertTrue(l.getCount() > 0); |
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} catch(InterruptedException ie){ |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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t.start(); |
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try { |
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assertEquals(l.getCount(), 1); |
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t.join(); |
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} catch (InterruptedException e){ |
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unexpectedException(); |
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} |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws InterruptedException { |
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assertEquals(1, l.getCount()); |
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assertFalse(l.await(timeoutMillis(), MILLISECONDS)); |
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assertEquals(1, l.getCount()); |
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}}); |
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|
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awaitTermination(t); |
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assertEquals(1, l.getCount()); |
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} |
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|
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/** |
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*/ |
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public void testToString() { |
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CountDownLatch s = new CountDownLatch(2); |
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String us = s.toString(); |
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assertTrue(us.indexOf("Count = 2") >= 0); |
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assertTrue(s.toString().contains("Count = 2")); |
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s.countDown(); |
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String s1 = s.toString(); |
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assertTrue(s1.indexOf("Count = 1") >= 0); |
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assertTrue(s.toString().contains("Count = 1")); |
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s.countDown(); |
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String s2 = s.toString(); |
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assertTrue(s2.indexOf("Count = 0") >= 0); |
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assertTrue(s.toString().contains("Count = 0")); |
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} |
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|
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} |
