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/* |
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* Written by members of JCP JSR-166 Expert Group and released to the |
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* public domain. Use, modify, and redistribute this code in any way |
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* without acknowledgement. Other contributors include Andrew Wright, |
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* Jeffrey Hayes, Pat Fischer, Mike Judd. |
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*/ |
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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 java.io.*; |
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|
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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()); |
17 |
} |
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|
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public static Test suite() { |
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return new TestSuite(SynchronousQueueTest.class); |
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} |
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|
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/** |
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* A SynchronousQueue is both empty and full |
25 |
*/ |
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public void testEmptyFull() { |
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SynchronousQueue q = new SynchronousQueue(); |
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assertTrue(q.isEmpty()); |
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assertEquals(0, q.size()); |
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assertEquals(0, q.remainingCapacity()); |
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assertFalse(q.offer(zero)); |
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} |
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|
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/** |
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* offer(null) throws NPE |
36 |
*/ |
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public void testOfferNull() { |
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try { |
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SynchronousQueue q = new SynchronousQueue(); |
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q.offer(null); |
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shouldThrow(); |
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} catch (NullPointerException success) { } |
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} |
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|
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/** |
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* add(null) throws NPE |
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*/ |
48 |
public void testAddNull() { |
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try { |
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SynchronousQueue q = new SynchronousQueue(); |
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q.add(null); |
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shouldThrow(); |
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} catch (NullPointerException success) { } |
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} |
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|
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/** |
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* offer fails if no active taker |
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*/ |
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public void testOffer() { |
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SynchronousQueue q = new SynchronousQueue(); |
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assertFalse(q.offer(one)); |
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} |
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|
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/** |
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* add throws ISE if no active taker |
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*/ |
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public void testAdd() { |
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try { |
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SynchronousQueue q = new SynchronousQueue(); |
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assertEquals(0, q.remainingCapacity()); |
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q.add(one); |
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shouldThrow(); |
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} catch (IllegalStateException success){ |
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} |
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} |
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|
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/** |
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* addAll(null) throws NPE |
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*/ |
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public void testAddAll1() { |
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try { |
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SynchronousQueue q = new SynchronousQueue(); |
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q.addAll(null); |
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shouldThrow(); |
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} |
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catch (NullPointerException success) {} |
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} |
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|
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/** |
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* addAll(this) throws IAE |
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*/ |
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public void testAddAllSelf() { |
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try { |
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SynchronousQueue q = new SynchronousQueue(); |
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q.addAll(q); |
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shouldThrow(); |
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} |
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catch (IllegalArgumentException success) {} |
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} |
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|
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/** |
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* addAll of a collection with null elements throws NPE |
103 |
*/ |
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public void testAddAll2() { |
105 |
try { |
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SynchronousQueue q = new SynchronousQueue(); |
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Integer[] ints = new Integer[1]; |
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q.addAll(Arrays.asList(ints)); |
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shouldThrow(); |
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} |
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catch (NullPointerException success) {} |
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} |
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/** |
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* addAll throws ISE if no active taker |
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*/ |
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public void testAddAll4() { |
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try { |
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SynchronousQueue q = new SynchronousQueue(); |
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Integer[] ints = new Integer[1]; |
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for (int i = 0; i < 1; ++i) |
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ints[i] = new Integer(i); |
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q.addAll(Arrays.asList(ints)); |
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shouldThrow(); |
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} |
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catch (IllegalStateException success) {} |
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} |
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|
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/** |
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* put(null) throws NPE |
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*/ |
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public void testPutNull() { |
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try { |
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SynchronousQueue q = new SynchronousQueue(); |
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q.put(null); |
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shouldThrow(); |
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} |
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catch (NullPointerException success){ |
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} |
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catch (InterruptedException ie) { |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* put blocks interruptibly if no active taker |
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*/ |
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public void testBlockingPut() { |
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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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SynchronousQueue q = new SynchronousQueue(); |
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q.put(zero); |
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threadShouldThrow(); |
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} catch (InterruptedException ie){ |
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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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t.interrupt(); |
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t.join(); |
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} |
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catch (InterruptedException ie) { |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* put blocks waiting for take |
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*/ |
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public void testPutWithTake() { |
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final SynchronousQueue q = new SynchronousQueue(); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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int added = 0; |
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try { |
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q.put(new Object()); |
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++added; |
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q.put(new Object()); |
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++added; |
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q.put(new Object()); |
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++added; |
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q.put(new Object()); |
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++added; |
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threadShouldThrow(); |
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} catch (InterruptedException e){ |
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assertTrue(added >= 1); |
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} |
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} |
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}); |
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try { |
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t.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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q.take(); |
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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t.join(); |
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} catch (Exception e){ |
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unexpectedException(); |
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} |
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} |
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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() { |
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final SynchronousQueue q = new SynchronousQueue(); |
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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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|
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threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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q.offer(new Object(), LONG_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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|
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try { |
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t.start(); |
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Thread.sleep(SMALL_DELAY_MS); |
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t.interrupt(); |
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t.join(); |
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} catch (Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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|
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/** |
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* take blocks interruptibly when empty |
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*/ |
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public void testTakeFromEmpty() { |
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final SynchronousQueue q = new SynchronousQueue(); |
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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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q.take(); |
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threadShouldThrow(); |
240 |
} catch (InterruptedException success){ } |
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} |
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}); |
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try { |
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t.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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t.join(); |
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} catch (Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* poll fails unless active taker |
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*/ |
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public void testPoll() { |
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SynchronousQueue q = new SynchronousQueue(); |
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assertNull(q.poll()); |
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} |
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|
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/** |
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* timed pool with zero timeout times out if no active taker |
263 |
*/ |
264 |
public void testTimedPoll0() { |
265 |
try { |
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SynchronousQueue q = new SynchronousQueue(); |
267 |
assertNull(q.poll(0, TimeUnit.MILLISECONDS)); |
268 |
} catch (InterruptedException e){ |
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unexpectedException(); |
270 |
} |
271 |
} |
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|
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/** |
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* timed pool with nonzero timeout times out if no active taker |
275 |
*/ |
276 |
public void testTimedPoll() { |
277 |
try { |
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SynchronousQueue q = new SynchronousQueue(); |
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assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
280 |
} catch (InterruptedException e){ |
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unexpectedException(); |
282 |
} |
283 |
} |
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|
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/** |
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* Interrupted timed poll throws InterruptedException instead of |
287 |
* returning timeout status |
288 |
*/ |
289 |
public void testInterruptedTimedPoll() { |
290 |
Thread t = new Thread(new Runnable() { |
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public void run() { |
292 |
try { |
293 |
SynchronousQueue q = new SynchronousQueue(); |
294 |
assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
295 |
} catch (InterruptedException success){ |
296 |
} |
297 |
}}); |
298 |
t.start(); |
299 |
try { |
300 |
Thread.sleep(SHORT_DELAY_MS); |
301 |
t.interrupt(); |
302 |
t.join(); |
303 |
} |
304 |
catch (InterruptedException ie) { |
305 |
unexpectedException(); |
306 |
} |
307 |
} |
308 |
|
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/** |
310 |
* timed poll before a delayed offer fails; after offer succeeds; |
311 |
* on interruption throws |
312 |
*/ |
313 |
public void testTimedPollWithOffer() { |
314 |
final SynchronousQueue q = new SynchronousQueue(); |
315 |
Thread t = new Thread(new Runnable() { |
316 |
public void run() { |
317 |
try { |
318 |
threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
319 |
q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS); |
320 |
q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS); |
321 |
threadShouldThrow(); |
322 |
} catch (InterruptedException success) { } |
323 |
} |
324 |
}); |
325 |
try { |
326 |
t.start(); |
327 |
Thread.sleep(SMALL_DELAY_MS); |
328 |
assertTrue(q.offer(zero, SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
329 |
t.interrupt(); |
330 |
t.join(); |
331 |
} catch (Exception e){ |
332 |
unexpectedException(); |
333 |
} |
334 |
} |
335 |
|
336 |
|
337 |
/** |
338 |
* peek returns null |
339 |
*/ |
340 |
public void testPeek() { |
341 |
SynchronousQueue q = new SynchronousQueue(); |
342 |
assertNull(q.peek()); |
343 |
} |
344 |
|
345 |
/** |
346 |
* element throws NSEE |
347 |
*/ |
348 |
public void testElement() { |
349 |
SynchronousQueue q = new SynchronousQueue(); |
350 |
try { |
351 |
q.element(); |
352 |
shouldThrow(); |
353 |
} |
354 |
catch (NoSuchElementException success) {} |
355 |
} |
356 |
|
357 |
/** |
358 |
* remove throws NSEE if no active taker |
359 |
*/ |
360 |
public void testRemove() { |
361 |
SynchronousQueue q = new SynchronousQueue(); |
362 |
try { |
363 |
q.remove(); |
364 |
shouldThrow(); |
365 |
} catch (NoSuchElementException success){ |
366 |
} |
367 |
} |
368 |
|
369 |
/** |
370 |
* remove(x) returns false |
371 |
*/ |
372 |
public void testRemoveElement() { |
373 |
SynchronousQueue q = new SynchronousQueue(); |
374 |
assertFalse(q.remove(zero)); |
375 |
assertTrue(q.isEmpty()); |
376 |
} |
377 |
|
378 |
/** |
379 |
* contains returns false |
380 |
*/ |
381 |
public void testContains() { |
382 |
SynchronousQueue q = new SynchronousQueue(); |
383 |
assertFalse(q.contains(zero)); |
384 |
} |
385 |
|
386 |
/** |
387 |
* clear ensures isEmpty |
388 |
*/ |
389 |
public void testClear() { |
390 |
SynchronousQueue q = new SynchronousQueue(); |
391 |
q.clear(); |
392 |
assertTrue(q.isEmpty()); |
393 |
} |
394 |
|
395 |
/** |
396 |
* containsAll returns false unless empty |
397 |
*/ |
398 |
public void testContainsAll() { |
399 |
SynchronousQueue q = new SynchronousQueue(); |
400 |
Integer[] empty = new Integer[0]; |
401 |
assertTrue(q.containsAll(Arrays.asList(empty))); |
402 |
Integer[] ints = new Integer[1]; ints[0] = zero; |
403 |
assertFalse(q.containsAll(Arrays.asList(ints))); |
404 |
} |
405 |
|
406 |
/** |
407 |
* retainAll returns false |
408 |
*/ |
409 |
public void testRetainAll() { |
410 |
SynchronousQueue q = new SynchronousQueue(); |
411 |
Integer[] empty = new Integer[0]; |
412 |
assertFalse(q.retainAll(Arrays.asList(empty))); |
413 |
Integer[] ints = new Integer[1]; ints[0] = zero; |
414 |
assertFalse(q.retainAll(Arrays.asList(ints))); |
415 |
} |
416 |
|
417 |
/** |
418 |
* removeAll returns false |
419 |
*/ |
420 |
public void testRemoveAll() { |
421 |
SynchronousQueue q = new SynchronousQueue(); |
422 |
Integer[] empty = new Integer[0]; |
423 |
assertFalse(q.removeAll(Arrays.asList(empty))); |
424 |
Integer[] ints = new Integer[1]; ints[0] = zero; |
425 |
assertFalse(q.containsAll(Arrays.asList(ints))); |
426 |
} |
427 |
|
428 |
|
429 |
/** |
430 |
* toArray is empty |
431 |
*/ |
432 |
public void testToArray() { |
433 |
SynchronousQueue q = new SynchronousQueue(); |
434 |
Object[] o = q.toArray(); |
435 |
assertEquals(o.length, 0); |
436 |
} |
437 |
|
438 |
/** |
439 |
* toArray(a) is nulled at position 0 |
440 |
*/ |
441 |
public void testToArray2() { |
442 |
SynchronousQueue q = new SynchronousQueue(); |
443 |
Integer[] ints = new Integer[1]; |
444 |
assertNull(ints[0]); |
445 |
} |
446 |
|
447 |
/** |
448 |
* toArray(null) throws NPE |
449 |
*/ |
450 |
public void testToArray_BadArg() { |
451 |
try { |
452 |
SynchronousQueue q = new SynchronousQueue(); |
453 |
Object o[] = q.toArray(null); |
454 |
shouldThrow(); |
455 |
} catch(NullPointerException success){} |
456 |
} |
457 |
|
458 |
|
459 |
/** |
460 |
* iterator does not traverse any elements |
461 |
*/ |
462 |
public void testIterator() { |
463 |
SynchronousQueue q = new SynchronousQueue(); |
464 |
Iterator it = q.iterator(); |
465 |
assertFalse(it.hasNext()); |
466 |
try { |
467 |
Object x = it.next(); |
468 |
shouldThrow(); |
469 |
} |
470 |
catch (NoSuchElementException success) {} |
471 |
} |
472 |
|
473 |
/** |
474 |
* iterator remove throws ISE |
475 |
*/ |
476 |
public void testIteratorRemove() { |
477 |
SynchronousQueue q = new SynchronousQueue(); |
478 |
Iterator it = q.iterator(); |
479 |
try { |
480 |
it.remove(); |
481 |
shouldThrow(); |
482 |
} |
483 |
catch (IllegalStateException success) {} |
484 |
} |
485 |
|
486 |
/** |
487 |
* toString returns a non-null string |
488 |
*/ |
489 |
public void testToString() { |
490 |
SynchronousQueue q = new SynchronousQueue(); |
491 |
String s = q.toString(); |
492 |
assertNotNull(s); |
493 |
} |
494 |
|
495 |
|
496 |
/** |
497 |
* offer transfers elements across Executor tasks |
498 |
*/ |
499 |
public void testOfferInExecutor() { |
500 |
final SynchronousQueue q = new SynchronousQueue(); |
501 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
502 |
final Integer one = new Integer(1); |
503 |
|
504 |
executor.execute(new Runnable() { |
505 |
public void run() { |
506 |
threadAssertFalse(q.offer(one)); |
507 |
try { |
508 |
threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS)); |
509 |
threadAssertEquals(0, q.remainingCapacity()); |
510 |
} |
511 |
catch (InterruptedException e) { |
512 |
threadUnexpectedException(); |
513 |
} |
514 |
} |
515 |
}); |
516 |
|
517 |
executor.execute(new Runnable() { |
518 |
public void run() { |
519 |
try { |
520 |
Thread.sleep(SMALL_DELAY_MS); |
521 |
threadAssertEquals(one, q.take()); |
522 |
} |
523 |
catch (InterruptedException e) { |
524 |
threadUnexpectedException(); |
525 |
} |
526 |
} |
527 |
}); |
528 |
|
529 |
joinPool(executor); |
530 |
|
531 |
} |
532 |
|
533 |
/** |
534 |
* poll retrieves elements across Executor threads |
535 |
*/ |
536 |
public void testPollInExecutor() { |
537 |
final SynchronousQueue q = new SynchronousQueue(); |
538 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
539 |
executor.execute(new Runnable() { |
540 |
public void run() { |
541 |
threadAssertNull(q.poll()); |
542 |
try { |
543 |
threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS)); |
544 |
threadAssertTrue(q.isEmpty()); |
545 |
} |
546 |
catch (InterruptedException e) { |
547 |
threadUnexpectedException(); |
548 |
} |
549 |
} |
550 |
}); |
551 |
|
552 |
executor.execute(new Runnable() { |
553 |
public void run() { |
554 |
try { |
555 |
Thread.sleep(SMALL_DELAY_MS); |
556 |
q.put(new Integer(1)); |
557 |
} |
558 |
catch (InterruptedException e) { |
559 |
threadUnexpectedException(); |
560 |
} |
561 |
} |
562 |
}); |
563 |
|
564 |
joinPool(executor); |
565 |
} |
566 |
|
567 |
/** |
568 |
* a deserialized serialized queue is usable |
569 |
*/ |
570 |
public void testSerialization() { |
571 |
SynchronousQueue q = new SynchronousQueue(); |
572 |
try { |
573 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
574 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
575 |
out.writeObject(q); |
576 |
out.close(); |
577 |
|
578 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
579 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
580 |
SynchronousQueue r = (SynchronousQueue)in.readObject(); |
581 |
assertEquals(q.size(), r.size()); |
582 |
while (!q.isEmpty()) |
583 |
assertEquals(q.remove(), r.remove()); |
584 |
} catch(Exception e){ |
585 |
unexpectedException(); |
586 |
} |
587 |
} |
588 |
|
589 |
/** |
590 |
* drainTo(null) throws NPE |
591 |
*/ |
592 |
public void testDrainToNull() { |
593 |
SynchronousQueue q = new SynchronousQueue(); |
594 |
try { |
595 |
q.drainTo(null); |
596 |
shouldThrow(); |
597 |
} catch(NullPointerException success) { |
598 |
} |
599 |
} |
600 |
|
601 |
/** |
602 |
* drainTo(this) throws IAE |
603 |
*/ |
604 |
public void testDrainToSelf() { |
605 |
SynchronousQueue q = new SynchronousQueue(); |
606 |
try { |
607 |
q.drainTo(q); |
608 |
shouldThrow(); |
609 |
} catch(IllegalArgumentException success) { |
610 |
} |
611 |
} |
612 |
|
613 |
/** |
614 |
* drainTo(c) of empty queue doesn't transfer elements |
615 |
*/ |
616 |
public void testDrainTo() { |
617 |
SynchronousQueue q = new SynchronousQueue(); |
618 |
ArrayList l = new ArrayList(); |
619 |
q.drainTo(l); |
620 |
assertEquals(q.size(), 0); |
621 |
assertEquals(l.size(), 0); |
622 |
} |
623 |
|
624 |
/** |
625 |
* drainTo empties queue, unblocking a waiting put. |
626 |
*/ |
627 |
public void testDrainToWithActivePut() { |
628 |
final SynchronousQueue q = new SynchronousQueue(); |
629 |
Thread t = new Thread(new Runnable() { |
630 |
public void run() { |
631 |
try { |
632 |
q.put(new Integer(1)); |
633 |
} catch (InterruptedException ie){ |
634 |
threadUnexpectedException(); |
635 |
} |
636 |
} |
637 |
}); |
638 |
try { |
639 |
t.start(); |
640 |
ArrayList l = new ArrayList(); |
641 |
Thread.sleep(SHORT_DELAY_MS); |
642 |
q.drainTo(l); |
643 |
assertTrue(l.size() <= 1); |
644 |
if (l.size() > 0) |
645 |
assertEquals(l.get(0), new Integer(1)); |
646 |
t.join(); |
647 |
assertTrue(l.size() <= 1); |
648 |
} catch(Exception e){ |
649 |
unexpectedException(); |
650 |
} |
651 |
} |
652 |
|
653 |
/** |
654 |
* drainTo(null, n) throws NPE |
655 |
*/ |
656 |
public void testDrainToNullN() { |
657 |
SynchronousQueue q = new SynchronousQueue(); |
658 |
try { |
659 |
q.drainTo(null, 0); |
660 |
shouldThrow(); |
661 |
} catch(NullPointerException success) { |
662 |
} |
663 |
} |
664 |
|
665 |
/** |
666 |
* drainTo(this, n) throws IAE |
667 |
*/ |
668 |
public void testDrainToSelfN() { |
669 |
SynchronousQueue q = new SynchronousQueue(); |
670 |
try { |
671 |
q.drainTo(q, 0); |
672 |
shouldThrow(); |
673 |
} catch(IllegalArgumentException success) { |
674 |
} |
675 |
} |
676 |
|
677 |
/** |
678 |
* drainTo(c, n) empties up to n elements of queue into c |
679 |
*/ |
680 |
public void testDrainToN() { |
681 |
final SynchronousQueue q = new SynchronousQueue(); |
682 |
Thread t1 = new Thread(new Runnable() { |
683 |
public void run() { |
684 |
try { |
685 |
q.put(one); |
686 |
} catch (InterruptedException ie){ |
687 |
threadUnexpectedException(); |
688 |
} |
689 |
} |
690 |
}); |
691 |
Thread t2 = new Thread(new Runnable() { |
692 |
public void run() { |
693 |
try { |
694 |
q.put(two); |
695 |
} catch (InterruptedException ie){ |
696 |
threadUnexpectedException(); |
697 |
} |
698 |
} |
699 |
}); |
700 |
|
701 |
try { |
702 |
t1.start(); |
703 |
t2.start(); |
704 |
ArrayList l = new ArrayList(); |
705 |
Thread.sleep(SHORT_DELAY_MS); |
706 |
q.drainTo(l, 1); |
707 |
assertTrue(l.size() == 1); |
708 |
q.drainTo(l, 1); |
709 |
assertTrue(l.size() == 2); |
710 |
assertTrue(l.contains(one)); |
711 |
assertTrue(l.contains(two)); |
712 |
t1.join(); |
713 |
t2.join(); |
714 |
} catch(Exception e){ |
715 |
unexpectedException(); |
716 |
} |
717 |
} |
718 |
|
719 |
|
720 |
} |