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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.Arrays; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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|
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.Iterator; |
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import java.util.NoSuchElementException; |
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import java.util.Queue; |
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import java.util.concurrent.BlockingQueue; |
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import java.util.concurrent.CountDownLatch; |
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import java.util.concurrent.Executors; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.SynchronousQueue; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import java.util.concurrent.ThreadLocalRandom; |
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|
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import junit.framework.Test; |
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public class SynchronousQueueTest extends JSR166TestCase { |
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} |
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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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}}); |
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await(pleaseInterrupt); |
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assertThreadStaysAlive(t); |
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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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assertEquals(0, q.remainingCapacity()); |
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}}); |
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await(pleaseTake); |
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assertEquals(q.remainingCapacity(), 0); |
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assertEquals(0, q.remainingCapacity()); |
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try { assertSame(one, q.take()); } |
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catch (InterruptedException e) { threadUnexpectedException(e); } |
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await(pleaseInterrupt); |
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assertThreadStaysAlive(t); |
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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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assertEquals(q.remainingCapacity(), 0); |
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assertEquals(0, q.remainingCapacity()); |
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} |
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/** |
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* timed offer times out if elements not taken |
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*/ |
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public void testTimedOffer() { testTimedOffer(false); } |
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public void testTimedOffer_fair() { testTimedOffer(true); } |
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public void testTimedOffer(boolean fair) { |
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public void testTimedOffer() { |
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final boolean fair = ThreadLocalRandom.current().nextBoolean(); |
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final SynchronousQueue q = new SynchronousQueue(fair); |
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final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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q.offer(new Object(), 2 * 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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|
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await(pleaseInterrupt); |
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assertThreadStaysAlive(t); |
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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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* timed poll with nonzero timeout times out if no active putter |
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*/ |
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public void testTimedPoll() { testTimedPoll(false); } |
233 |
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public void testTimedPoll_fair() { testTimedPoll(true); } |
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public void testTimedPoll(boolean fair) { |
232 |
> |
public void testTimedPoll() { |
233 |
> |
final boolean fair = ThreadLocalRandom.current().nextBoolean(); |
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final SynchronousQueue q = new SynchronousQueue(fair); |
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long startTime = System.nanoTime(); |
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final long startTime = System.nanoTime(); |
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try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); } |
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catch (InterruptedException e) { threadUnexpectedException(e); } |
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assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
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* timed poll before a delayed offer times out, returning null; |
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* after offer succeeds; on interruption throws |
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*/ |
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public void testTimedPollWithOffer() { testTimedPollWithOffer(false); } |
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public void testTimedPollWithOffer_fair() { testTimedPollWithOffer(true); } |
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public void testTimedPollWithOffer(boolean fair) { |
245 |
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public void testTimedPollWithOffer() { |
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> |
final boolean fair = ThreadLocalRandom.current().nextBoolean(); |
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final SynchronousQueue q = new SynchronousQueue(fair); |
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final CountDownLatch pleaseOffer = new CountDownLatch(1); |
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final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
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pleaseOffer.countDown(); |
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startTime = System.nanoTime(); |
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assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
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assertTrue(millisElapsedSince(startTime) < MEDIUM_DELAY_MS); |
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Thread.currentThread().interrupt(); |
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try { |
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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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assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
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}}); |
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|
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await(pleaseOffer); |
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long startTime = System.nanoTime(); |
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try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); } |
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catch (InterruptedException e) { threadUnexpectedException(e); } |
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assertTrue(millisElapsedSince(startTime) < MEDIUM_DELAY_MS); |
281 |
> |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
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|
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await(pleaseInterrupt); |
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assertThreadStaysAlive(t); |
284 |
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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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public void testToArray(boolean fair) { |
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final SynchronousQueue q = new SynchronousQueue(fair); |
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Object[] o = q.toArray(); |
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assertEquals(o.length, 0); |
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assertEquals(0, o.length); |
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} |
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|
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/** |
397 |
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* toArray(a) is nulled at position 0 |
397 |
> |
* toArray(Integer array) returns its argument with the first |
398 |
> |
* element (if present) nulled out |
399 |
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*/ |
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public void testToArray2() { testToArray2(false); } |
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public void testToArray2_fair() { testToArray2(true); } |
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public void testToArray2(boolean fair) { |
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< |
final SynchronousQueue q = new SynchronousQueue(fair); |
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Integer[] ints = new Integer[1]; |
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< |
assertNull(ints[0]); |
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> |
final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair); |
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> |
Integer[] a; |
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|
406 |
> |
a = new Integer[0]; |
407 |
> |
assertSame(a, q.toArray(a)); |
408 |
> |
|
409 |
> |
a = new Integer[3]; |
410 |
> |
Arrays.fill(a, 42); |
411 |
> |
assertSame(a, q.toArray(a)); |
412 |
> |
assertNull(a[0]); |
413 |
> |
for (int i = 1; i < a.length; i++) |
414 |
> |
assertEquals(42, (int) a[i]); |
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} |
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|
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/** |
422 |
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public void testToArray_null(boolean fair) { |
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final SynchronousQueue q = new SynchronousQueue(fair); |
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try { |
425 |
< |
Object o[] = q.toArray(null); |
425 |
> |
Object[] o = q.toArray(null); |
426 |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
428 |
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} |
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public void testIterator() { testIterator(false); } |
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public void testIterator_fair() { testIterator(true); } |
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public void testIterator(boolean fair) { |
436 |
< |
final SynchronousQueue q = new SynchronousQueue(fair); |
426 |
< |
Iterator it = q.iterator(); |
427 |
< |
assertFalse(it.hasNext()); |
428 |
< |
try { |
429 |
< |
Object x = it.next(); |
430 |
< |
shouldThrow(); |
431 |
< |
} catch (NoSuchElementException success) {} |
436 |
> |
assertIteratorExhausted(new SynchronousQueue(fair).iterator()); |
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} |
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|
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/** |
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public void testOfferInExecutor_fair() { testOfferInExecutor(true); } |
469 |
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public void testOfferInExecutor(boolean fair) { |
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final SynchronousQueue q = new SynchronousQueue(fair); |
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– |
ExecutorService executor = Executors.newFixedThreadPool(2); |
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final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
472 |
+ |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
473 |
+ |
try (PoolCleaner cleaner = cleaner(executor)) { |
474 |
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|
475 |
< |
executor.execute(new CheckedRunnable() { |
476 |
< |
public void realRun() throws InterruptedException { |
477 |
< |
assertFalse(q.offer(one)); |
478 |
< |
threadsStarted.await(); |
479 |
< |
assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS)); |
480 |
< |
assertEquals(0, q.remainingCapacity()); |
481 |
< |
}}); |
482 |
< |
|
483 |
< |
executor.execute(new CheckedRunnable() { |
484 |
< |
public void realRun() throws InterruptedException { |
485 |
< |
threadsStarted.await(); |
486 |
< |
assertSame(one, q.take()); |
487 |
< |
}}); |
488 |
< |
|
483 |
< |
joinPool(executor); |
475 |
> |
executor.execute(new CheckedRunnable() { |
476 |
> |
public void realRun() throws InterruptedException { |
477 |
> |
assertFalse(q.offer(one)); |
478 |
> |
threadsStarted.await(); |
479 |
> |
assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS)); |
480 |
> |
assertEquals(0, q.remainingCapacity()); |
481 |
> |
}}); |
482 |
> |
|
483 |
> |
executor.execute(new CheckedRunnable() { |
484 |
> |
public void realRun() throws InterruptedException { |
485 |
> |
threadsStarted.await(); |
486 |
> |
assertSame(one, q.take()); |
487 |
> |
}}); |
488 |
> |
} |
489 |
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} |
490 |
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|
491 |
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/** |
496 |
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public void testPollInExecutor(boolean fair) { |
497 |
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final SynchronousQueue q = new SynchronousQueue(fair); |
498 |
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final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
499 |
< |
ExecutorService executor = Executors.newFixedThreadPool(2); |
500 |
< |
executor.execute(new CheckedRunnable() { |
501 |
< |
public void realRun() throws InterruptedException { |
502 |
< |
assertNull(q.poll()); |
503 |
< |
threadsStarted.await(); |
504 |
< |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
505 |
< |
assertTrue(q.isEmpty()); |
506 |
< |
}}); |
507 |
< |
|
508 |
< |
executor.execute(new CheckedRunnable() { |
509 |
< |
public void realRun() throws InterruptedException { |
510 |
< |
threadsStarted.await(); |
511 |
< |
q.put(one); |
512 |
< |
}}); |
513 |
< |
|
514 |
< |
joinPool(executor); |
499 |
> |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
500 |
> |
try (PoolCleaner cleaner = cleaner(executor)) { |
501 |
> |
executor.execute(new CheckedRunnable() { |
502 |
> |
public void realRun() throws InterruptedException { |
503 |
> |
assertNull(q.poll()); |
504 |
> |
threadsStarted.await(); |
505 |
> |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
506 |
> |
assertTrue(q.isEmpty()); |
507 |
> |
}}); |
508 |
> |
|
509 |
> |
executor.execute(new CheckedRunnable() { |
510 |
> |
public void realRun() throws InterruptedException { |
511 |
> |
threadsStarted.await(); |
512 |
> |
q.put(one); |
513 |
> |
}}); |
514 |
> |
} |
515 |
|
} |
516 |
|
|
517 |
|
/** |
518 |
|
* a deserialized serialized queue is usable |
519 |
|
*/ |
520 |
< |
public void testSerialization() { testSerialization(false); } |
521 |
< |
public void testSerialization_fair() { testSerialization(true); } |
522 |
< |
public void testSerialization(boolean fair) { |
523 |
< |
final SynchronousQueue x = new SynchronousQueue(fair); |
524 |
< |
final SynchronousQueue y = serialClone(x); |
525 |
< |
assertTrue(x != y); |
526 |
< |
assertTrue(x.isEmpty()); |
527 |
< |
assertTrue(y.isEmpty()); |
520 |
> |
public void testSerialization() { |
521 |
> |
final SynchronousQueue x = new SynchronousQueue(); |
522 |
> |
final SynchronousQueue y = new SynchronousQueue(false); |
523 |
> |
final SynchronousQueue z = new SynchronousQueue(true); |
524 |
> |
assertSerialEquals(x, y); |
525 |
> |
assertNotSerialEquals(x, z); |
526 |
> |
SynchronousQueue[] qs = { x, y, z }; |
527 |
> |
for (SynchronousQueue q : qs) { |
528 |
> |
SynchronousQueue clone = serialClone(q); |
529 |
> |
assertNotSame(q, clone); |
530 |
> |
assertSerialEquals(q, clone); |
531 |
> |
assertTrue(clone.isEmpty()); |
532 |
> |
assertEquals(0, clone.size()); |
533 |
> |
assertEquals(0, clone.remainingCapacity()); |
534 |
> |
assertFalse(clone.offer(zero)); |
535 |
> |
} |
536 |
|
} |
537 |
|
|
538 |
|
/** |
544 |
|
final SynchronousQueue q = new SynchronousQueue(fair); |
545 |
|
ArrayList l = new ArrayList(); |
546 |
|
q.drainTo(l); |
547 |
< |
assertEquals(q.size(), 0); |
548 |
< |
assertEquals(l.size(), 0); |
547 |
> |
assertEquals(0, q.size()); |
548 |
> |
assertEquals(0, l.size()); |
549 |
|
} |
550 |
|
|
551 |
|
/** |
568 |
|
fail("timed out"); |
569 |
|
Thread.yield(); |
570 |
|
} |
571 |
< |
assertTrue(l.size() == 1); |
571 |
> |
assertEquals(1, l.size()); |
572 |
|
assertSame(one, l.get(0)); |
573 |
|
awaitTermination(t); |
574 |
|
} |
589 |
|
}}); |
590 |
|
|
591 |
|
ArrayList l = new ArrayList(); |
592 |
< |
delay(SHORT_DELAY_MS); |
593 |
< |
q.drainTo(l, 1); |
592 |
> |
int drained; |
593 |
> |
while ((drained = q.drainTo(l, 1)) == 0) Thread.yield(); |
594 |
> |
assertEquals(1, drained); |
595 |
|
assertEquals(1, l.size()); |
596 |
< |
q.drainTo(l, 1); |
596 |
> |
while ((drained = q.drainTo(l, 1)) == 0) Thread.yield(); |
597 |
> |
assertEquals(1, drained); |
598 |
|
assertEquals(2, l.size()); |
599 |
|
assertTrue(l.contains(one)); |
600 |
|
assertTrue(l.contains(two)); |
602 |
|
awaitTermination(t2); |
603 |
|
} |
604 |
|
|
605 |
+ |
/** |
606 |
+ |
* remove(null), contains(null) always return false |
607 |
+ |
*/ |
608 |
+ |
public void testNeverContainsNull() { |
609 |
+ |
Collection<?> q = new SynchronousQueue(); |
610 |
+ |
assertFalse(q.contains(null)); |
611 |
+ |
assertFalse(q.remove(null)); |
612 |
+ |
} |
613 |
+ |
|
614 |
|
} |