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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/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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|
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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.Comparator; |
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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.PriorityBlockingQueue; |
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|
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import junit.framework.Test; |
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|
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public class PriorityBlockingQueueTest extends JSR166TestCase { |
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|
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public static class Generic extends BlockingQueueTest { |
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protected BlockingQueue emptyCollection() { |
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return new PriorityBlockingQueue(); |
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} |
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} |
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|
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public static class InitialCapacity extends BlockingQueueTest { |
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protected BlockingQueue emptyCollection() { |
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return new PriorityBlockingQueue(SIZE); |
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} |
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} |
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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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} |
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|
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public static Test suite() { |
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return newTestSuite(PriorityBlockingQueueTest.class, |
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new Generic().testSuite(), |
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new InitialCapacity().testSuite()); |
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} |
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|
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/** Sample Comparator */ |
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static class MyReverseComparator implements Comparator { |
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public int compare(Object x, Object y) { |
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return ((Comparable)y).compareTo(x); |
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} |
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} |
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|
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/** |
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* Returns a new queue of given size containing consecutive |
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* Integers 0 ... n. |
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*/ |
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private PriorityBlockingQueue<Integer> populatedQueue(int n) { |
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PriorityBlockingQueue<Integer> q = |
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new PriorityBlockingQueue<Integer>(n); |
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assertTrue(q.isEmpty()); |
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for (int i = n-1; i >= 0; i -= 2) |
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assertTrue(q.offer(new Integer(i))); |
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for (int i = (n & 1); i < n; i += 2) |
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assertTrue(q.offer(new Integer(i))); |
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assertFalse(q.isEmpty()); |
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assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
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assertEquals(n, q.size()); |
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return q; |
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} |
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|
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/** |
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* A new queue has unbounded capacity |
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*/ |
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public void testConstructor1() { |
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assertEquals(Integer.MAX_VALUE, |
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new PriorityBlockingQueue(SIZE).remainingCapacity()); |
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} |
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|
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/** |
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* Constructor throws IAE if capacity argument nonpositive |
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*/ |
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public void testConstructor2() { |
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try { |
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new PriorityBlockingQueue(0); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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} |
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|
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/** |
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* Initializing from null Collection throws NPE |
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*/ |
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public void testConstructor3() { |
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try { |
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new PriorityBlockingQueue(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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* Initializing from Collection of null elements throws NPE |
105 |
*/ |
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public void testConstructor4() { |
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Collection<Integer> elements = Arrays.asList(new Integer[SIZE]); |
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try { |
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new PriorityBlockingQueue(elements); |
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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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* Initializing from Collection with some null elements throws NPE |
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*/ |
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public void testConstructor5() { |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE-1; ++i) |
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ints[i] = i; |
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Collection<Integer> elements = Arrays.asList(ints); |
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try { |
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new PriorityBlockingQueue(elements); |
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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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* Queue contains all elements of collection used to initialize |
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*/ |
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public void testConstructor6() { |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE; ++i) |
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ints[i] = i; |
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PriorityBlockingQueue q = new PriorityBlockingQueue(Arrays.asList(ints)); |
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for (int i = 0; i < SIZE; ++i) |
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assertEquals(ints[i], q.poll()); |
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} |
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|
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/** |
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* The comparator used in constructor is used |
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*/ |
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public void testConstructor7() { |
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MyReverseComparator cmp = new MyReverseComparator(); |
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PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE, cmp); |
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assertEquals(cmp, q.comparator()); |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE; ++i) |
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ints[i] = new Integer(i); |
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q.addAll(Arrays.asList(ints)); |
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for (int i = SIZE-1; i >= 0; --i) |
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assertEquals(ints[i], q.poll()); |
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} |
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|
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/** |
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* isEmpty is true before add, false after |
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*/ |
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public void testEmpty() { |
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PriorityBlockingQueue q = new PriorityBlockingQueue(2); |
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assertTrue(q.isEmpty()); |
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assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
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q.add(one); |
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assertFalse(q.isEmpty()); |
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q.add(two); |
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q.remove(); |
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q.remove(); |
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assertTrue(q.isEmpty()); |
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} |
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|
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/** |
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* remainingCapacity() always returns Integer.MAX_VALUE |
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*/ |
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public void testRemainingCapacity() { |
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BlockingQueue q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
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assertEquals(SIZE - i, q.size()); |
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assertEquals(i, q.remove()); |
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} |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
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assertEquals(i, q.size()); |
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assertTrue(q.add(i)); |
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} |
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} |
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|
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/** |
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* Offer of comparable element succeeds |
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*/ |
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public void testOffer() { |
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PriorityBlockingQueue q = new PriorityBlockingQueue(1); |
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assertTrue(q.offer(zero)); |
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assertTrue(q.offer(one)); |
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} |
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|
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/** |
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* Offer of non-Comparable throws CCE |
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*/ |
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public void testOfferNonComparable() { |
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PriorityBlockingQueue q = new PriorityBlockingQueue(1); |
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try { |
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q.offer(new Object()); |
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q.offer(new Object()); |
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shouldThrow(); |
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} catch (ClassCastException success) {} |
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} |
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|
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/** |
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* add of comparable succeeds |
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*/ |
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public void testAdd() { |
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PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.size()); |
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assertTrue(q.add(new Integer(i))); |
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} |
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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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PriorityBlockingQueue q = populatedQueue(SIZE); |
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q.addAll(q); |
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shouldThrow(); |
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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 any null elements throws NPE after |
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* possibly adding some elements |
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*/ |
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public void testAddAll3() { |
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try { |
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PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE); |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE-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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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* Queue contains all elements of successful addAll |
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*/ |
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public void testAddAll5() { |
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Integer[] empty = new Integer[0]; |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = SIZE-1; i >= 0; --i) |
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ints[i] = new Integer(i); |
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PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE); |
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assertFalse(q.addAll(Arrays.asList(empty))); |
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assertTrue(q.addAll(Arrays.asList(ints))); |
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for (int i = 0; i < SIZE; ++i) |
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assertEquals(ints[i], q.poll()); |
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} |
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|
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/** |
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* all elements successfully put are contained |
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*/ |
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public void testPut() { |
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PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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Integer x = new Integer(i); |
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q.put(x); |
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assertTrue(q.contains(x)); |
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} |
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assertEquals(SIZE, q.size()); |
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} |
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|
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/** |
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* put doesn't block waiting for take |
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*/ |
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public void testPutWithTake() throws InterruptedException { |
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final PriorityBlockingQueue q = new PriorityBlockingQueue(2); |
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final int size = 4; |
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Thread t = newStartedThread(new CheckedRunnable() { |
280 |
public void realRun() { |
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for (int i = 0; i < size; i++) |
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q.put(new Integer(0)); |
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}}); |
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|
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awaitTermination(t); |
286 |
assertEquals(size, q.size()); |
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q.take(); |
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} |
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|
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/** |
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* timed offer does not time out |
292 |
*/ |
293 |
public void testTimedOffer() throws InterruptedException { |
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final PriorityBlockingQueue q = new PriorityBlockingQueue(2); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() { |
297 |
q.put(new Integer(0)); |
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q.put(new Integer(0)); |
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assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, MILLISECONDS)); |
300 |
assertTrue(q.offer(new Integer(0), LONG_DELAY_MS, MILLISECONDS)); |
301 |
}}); |
302 |
|
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awaitTermination(t); |
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} |
305 |
|
306 |
/** |
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* take retrieves elements in priority order |
308 |
*/ |
309 |
public void testTake() throws InterruptedException { |
310 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
311 |
for (int i = 0; i < SIZE; ++i) { |
312 |
assertEquals(i, q.take()); |
313 |
} |
314 |
} |
315 |
|
316 |
/** |
317 |
* Take removes existing elements until empty, then blocks interruptibly |
318 |
*/ |
319 |
public void testBlockingTake() throws InterruptedException { |
320 |
final PriorityBlockingQueue q = populatedQueue(SIZE); |
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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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for (int i = 0; i < SIZE; ++i) { |
325 |
assertEquals(i, q.take()); |
326 |
} |
327 |
|
328 |
Thread.currentThread().interrupt(); |
329 |
try { |
330 |
q.take(); |
331 |
shouldThrow(); |
332 |
} catch (InterruptedException success) {} |
333 |
assertFalse(Thread.interrupted()); |
334 |
|
335 |
pleaseInterrupt.countDown(); |
336 |
try { |
337 |
q.take(); |
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shouldThrow(); |
339 |
} catch (InterruptedException success) {} |
340 |
assertFalse(Thread.interrupted()); |
341 |
}}); |
342 |
|
343 |
await(pleaseInterrupt); |
344 |
assertThreadStaysAlive(t); |
345 |
t.interrupt(); |
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awaitTermination(t); |
347 |
} |
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|
349 |
/** |
350 |
* poll succeeds unless empty |
351 |
*/ |
352 |
public void testPoll() { |
353 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
354 |
for (int i = 0; i < SIZE; ++i) { |
355 |
assertEquals(i, q.poll()); |
356 |
} |
357 |
assertNull(q.poll()); |
358 |
} |
359 |
|
360 |
/** |
361 |
* timed poll with zero timeout succeeds when non-empty, else times out |
362 |
*/ |
363 |
public void testTimedPoll0() throws InterruptedException { |
364 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
365 |
for (int i = 0; i < SIZE; ++i) { |
366 |
assertEquals(i, q.poll(0, MILLISECONDS)); |
367 |
} |
368 |
assertNull(q.poll(0, MILLISECONDS)); |
369 |
} |
370 |
|
371 |
/** |
372 |
* timed poll with nonzero timeout succeeds when non-empty, else times out |
373 |
*/ |
374 |
public void testTimedPoll() throws InterruptedException { |
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PriorityBlockingQueue<Integer> q = populatedQueue(SIZE); |
376 |
for (int i = 0; i < SIZE; ++i) { |
377 |
long startTime = System.nanoTime(); |
378 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
379 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
380 |
} |
381 |
long startTime = System.nanoTime(); |
382 |
assertNull(q.poll(timeoutMillis(), MILLISECONDS)); |
383 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
384 |
checkEmpty(q); |
385 |
} |
386 |
|
387 |
/** |
388 |
* Interrupted timed poll throws InterruptedException instead of |
389 |
* returning timeout status |
390 |
*/ |
391 |
public void testInterruptedTimedPoll() throws InterruptedException { |
392 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
393 |
final CountDownLatch aboutToWait = new CountDownLatch(1); |
394 |
Thread t = newStartedThread(new CheckedRunnable() { |
395 |
public void realRun() throws InterruptedException { |
396 |
for (int i = 0; i < SIZE; ++i) { |
397 |
long t0 = System.nanoTime(); |
398 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
399 |
assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS); |
400 |
} |
401 |
long t0 = System.nanoTime(); |
402 |
aboutToWait.countDown(); |
403 |
try { |
404 |
q.poll(LONG_DELAY_MS, MILLISECONDS); |
405 |
shouldThrow(); |
406 |
} catch (InterruptedException success) { |
407 |
assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS); |
408 |
} |
409 |
}}); |
410 |
|
411 |
aboutToWait.await(); |
412 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
413 |
t.interrupt(); |
414 |
awaitTermination(t, MEDIUM_DELAY_MS); |
415 |
} |
416 |
|
417 |
/** |
418 |
* peek returns next element, or null if empty |
419 |
*/ |
420 |
public void testPeek() { |
421 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
422 |
for (int i = 0; i < SIZE; ++i) { |
423 |
assertEquals(i, q.peek()); |
424 |
assertEquals(i, q.poll()); |
425 |
assertTrue(q.peek() == null || |
426 |
!q.peek().equals(i)); |
427 |
} |
428 |
assertNull(q.peek()); |
429 |
} |
430 |
|
431 |
/** |
432 |
* element returns next element, or throws NSEE if empty |
433 |
*/ |
434 |
public void testElement() { |
435 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
436 |
for (int i = 0; i < SIZE; ++i) { |
437 |
assertEquals(i, q.element()); |
438 |
assertEquals(i, q.poll()); |
439 |
} |
440 |
try { |
441 |
q.element(); |
442 |
shouldThrow(); |
443 |
} catch (NoSuchElementException success) {} |
444 |
} |
445 |
|
446 |
/** |
447 |
* remove removes next element, or throws NSEE if empty |
448 |
*/ |
449 |
public void testRemove() { |
450 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
451 |
for (int i = 0; i < SIZE; ++i) { |
452 |
assertEquals(i, q.remove()); |
453 |
} |
454 |
try { |
455 |
q.remove(); |
456 |
shouldThrow(); |
457 |
} catch (NoSuchElementException success) {} |
458 |
} |
459 |
|
460 |
/** |
461 |
* contains(x) reports true when elements added but not yet removed |
462 |
*/ |
463 |
public void testContains() { |
464 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
465 |
for (int i = 0; i < SIZE; ++i) { |
466 |
assertTrue(q.contains(new Integer(i))); |
467 |
q.poll(); |
468 |
assertFalse(q.contains(new Integer(i))); |
469 |
} |
470 |
} |
471 |
|
472 |
/** |
473 |
* clear removes all elements |
474 |
*/ |
475 |
public void testClear() { |
476 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
477 |
q.clear(); |
478 |
assertTrue(q.isEmpty()); |
479 |
assertEquals(0, q.size()); |
480 |
q.add(one); |
481 |
assertFalse(q.isEmpty()); |
482 |
assertTrue(q.contains(one)); |
483 |
q.clear(); |
484 |
assertTrue(q.isEmpty()); |
485 |
} |
486 |
|
487 |
/** |
488 |
* containsAll(c) is true when c contains a subset of elements |
489 |
*/ |
490 |
public void testContainsAll() { |
491 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
492 |
PriorityBlockingQueue p = new PriorityBlockingQueue(SIZE); |
493 |
for (int i = 0; i < SIZE; ++i) { |
494 |
assertTrue(q.containsAll(p)); |
495 |
assertFalse(p.containsAll(q)); |
496 |
p.add(new Integer(i)); |
497 |
} |
498 |
assertTrue(p.containsAll(q)); |
499 |
} |
500 |
|
501 |
/** |
502 |
* retainAll(c) retains only those elements of c and reports true if changed |
503 |
*/ |
504 |
public void testRetainAll() { |
505 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
506 |
PriorityBlockingQueue p = populatedQueue(SIZE); |
507 |
for (int i = 0; i < SIZE; ++i) { |
508 |
boolean changed = q.retainAll(p); |
509 |
if (i == 0) |
510 |
assertFalse(changed); |
511 |
else |
512 |
assertTrue(changed); |
513 |
|
514 |
assertTrue(q.containsAll(p)); |
515 |
assertEquals(SIZE-i, q.size()); |
516 |
p.remove(); |
517 |
} |
518 |
} |
519 |
|
520 |
/** |
521 |
* removeAll(c) removes only those elements of c and reports true if changed |
522 |
*/ |
523 |
public void testRemoveAll() { |
524 |
for (int i = 1; i < SIZE; ++i) { |
525 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
526 |
PriorityBlockingQueue p = populatedQueue(i); |
527 |
assertTrue(q.removeAll(p)); |
528 |
assertEquals(SIZE-i, q.size()); |
529 |
for (int j = 0; j < i; ++j) { |
530 |
Integer x = (Integer)(p.remove()); |
531 |
assertFalse(q.contains(x)); |
532 |
} |
533 |
} |
534 |
} |
535 |
|
536 |
/** |
537 |
* toArray contains all elements |
538 |
*/ |
539 |
public void testToArray() throws InterruptedException { |
540 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
541 |
Object[] o = q.toArray(); |
542 |
Arrays.sort(o); |
543 |
for (int i = 0; i < o.length; i++) |
544 |
assertSame(o[i], q.take()); |
545 |
} |
546 |
|
547 |
/** |
548 |
* toArray(a) contains all elements |
549 |
*/ |
550 |
public void testToArray2() throws InterruptedException { |
551 |
PriorityBlockingQueue<Integer> q = populatedQueue(SIZE); |
552 |
Integer[] ints = new Integer[SIZE]; |
553 |
Integer[] array = q.toArray(ints); |
554 |
assertSame(ints, array); |
555 |
Arrays.sort(ints); |
556 |
for (int i = 0; i < ints.length; i++) |
557 |
assertSame(ints[i], q.take()); |
558 |
} |
559 |
|
560 |
/** |
561 |
* toArray(incompatible array type) throws ArrayStoreException |
562 |
*/ |
563 |
public void testToArray1_BadArg() { |
564 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
565 |
try { |
566 |
q.toArray(new String[10]); |
567 |
shouldThrow(); |
568 |
} catch (ArrayStoreException success) {} |
569 |
} |
570 |
|
571 |
/** |
572 |
* iterator iterates through all elements |
573 |
*/ |
574 |
public void testIterator() { |
575 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
576 |
Iterator it = q.iterator(); |
577 |
int i; |
578 |
for (i = 0; it.hasNext(); i++) |
579 |
assertTrue(q.contains(it.next())); |
580 |
assertEquals(i, SIZE); |
581 |
assertIteratorExhausted(it); |
582 |
} |
583 |
|
584 |
/** |
585 |
* iterator of empty collection has no elements |
586 |
*/ |
587 |
public void testEmptyIterator() { |
588 |
assertIteratorExhausted(new PriorityBlockingQueue().iterator()); |
589 |
} |
590 |
|
591 |
/** |
592 |
* iterator.remove removes current element |
593 |
*/ |
594 |
public void testIteratorRemove() { |
595 |
final PriorityBlockingQueue q = new PriorityBlockingQueue(3); |
596 |
q.add(new Integer(2)); |
597 |
q.add(new Integer(1)); |
598 |
q.add(new Integer(3)); |
599 |
|
600 |
Iterator it = q.iterator(); |
601 |
it.next(); |
602 |
it.remove(); |
603 |
|
604 |
it = q.iterator(); |
605 |
assertEquals(it.next(), new Integer(2)); |
606 |
assertEquals(it.next(), new Integer(3)); |
607 |
assertFalse(it.hasNext()); |
608 |
} |
609 |
|
610 |
/** |
611 |
* toString contains toStrings of elements |
612 |
*/ |
613 |
public void testToString() { |
614 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
615 |
String s = q.toString(); |
616 |
for (int i = 0; i < SIZE; ++i) { |
617 |
assertTrue(s.contains(String.valueOf(i))); |
618 |
} |
619 |
} |
620 |
|
621 |
/** |
622 |
* timed poll transfers elements across Executor tasks |
623 |
*/ |
624 |
public void testPollInExecutor() { |
625 |
final PriorityBlockingQueue q = new PriorityBlockingQueue(2); |
626 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
627 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
628 |
executor.execute(new CheckedRunnable() { |
629 |
public void realRun() throws InterruptedException { |
630 |
assertNull(q.poll()); |
631 |
threadsStarted.await(); |
632 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
633 |
checkEmpty(q); |
634 |
}}); |
635 |
|
636 |
executor.execute(new CheckedRunnable() { |
637 |
public void realRun() throws InterruptedException { |
638 |
threadsStarted.await(); |
639 |
q.put(one); |
640 |
}}); |
641 |
|
642 |
joinPool(executor); |
643 |
} |
644 |
|
645 |
/** |
646 |
* A deserialized serialized queue has same elements |
647 |
*/ |
648 |
public void testSerialization() throws Exception { |
649 |
Queue x = populatedQueue(SIZE); |
650 |
Queue y = serialClone(x); |
651 |
|
652 |
assertNotSame(x, y); |
653 |
assertEquals(x.size(), y.size()); |
654 |
while (!x.isEmpty()) { |
655 |
assertFalse(y.isEmpty()); |
656 |
assertEquals(x.remove(), y.remove()); |
657 |
} |
658 |
assertTrue(y.isEmpty()); |
659 |
} |
660 |
|
661 |
/** |
662 |
* drainTo(c) empties queue into another collection c |
663 |
*/ |
664 |
public void testDrainTo() { |
665 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
666 |
ArrayList l = new ArrayList(); |
667 |
q.drainTo(l); |
668 |
assertEquals(0, q.size()); |
669 |
assertEquals(SIZE, l.size()); |
670 |
for (int i = 0; i < SIZE; ++i) |
671 |
assertEquals(l.get(i), new Integer(i)); |
672 |
q.add(zero); |
673 |
q.add(one); |
674 |
assertFalse(q.isEmpty()); |
675 |
assertTrue(q.contains(zero)); |
676 |
assertTrue(q.contains(one)); |
677 |
l.clear(); |
678 |
q.drainTo(l); |
679 |
assertEquals(0, q.size()); |
680 |
assertEquals(2, l.size()); |
681 |
for (int i = 0; i < 2; ++i) |
682 |
assertEquals(l.get(i), new Integer(i)); |
683 |
} |
684 |
|
685 |
/** |
686 |
* drainTo empties queue |
687 |
*/ |
688 |
public void testDrainToWithActivePut() throws InterruptedException { |
689 |
final PriorityBlockingQueue q = populatedQueue(SIZE); |
690 |
Thread t = new Thread(new CheckedRunnable() { |
691 |
public void realRun() { |
692 |
q.put(new Integer(SIZE+1)); |
693 |
}}); |
694 |
|
695 |
t.start(); |
696 |
ArrayList l = new ArrayList(); |
697 |
q.drainTo(l); |
698 |
assertTrue(l.size() >= SIZE); |
699 |
for (int i = 0; i < SIZE; ++i) |
700 |
assertEquals(l.get(i), new Integer(i)); |
701 |
t.join(); |
702 |
assertTrue(q.size() + l.size() >= SIZE); |
703 |
} |
704 |
|
705 |
/** |
706 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
707 |
*/ |
708 |
public void testDrainToN() { |
709 |
PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE*2); |
710 |
for (int i = 0; i < SIZE + 2; ++i) { |
711 |
for (int j = 0; j < SIZE; j++) |
712 |
assertTrue(q.offer(new Integer(j))); |
713 |
ArrayList l = new ArrayList(); |
714 |
q.drainTo(l, i); |
715 |
int k = (i < SIZE) ? i : SIZE; |
716 |
assertEquals(k, l.size()); |
717 |
assertEquals(SIZE-k, q.size()); |
718 |
for (int j = 0; j < k; ++j) |
719 |
assertEquals(l.get(j), new Integer(j)); |
720 |
do {} while (q.poll() != null); |
721 |
} |
722 |
} |
723 |
|
724 |
/** |
725 |
* remove(null), contains(null) always return false |
726 |
*/ |
727 |
public void testNeverContainsNull() { |
728 |
Collection<?>[] qs = { |
729 |
new PriorityBlockingQueue<Object>(), |
730 |
populatedQueue(2), |
731 |
}; |
732 |
|
733 |
for (Collection<?> q : qs) { |
734 |
assertFalse(q.contains(null)); |
735 |
assertFalse(q.remove(null)); |
736 |
} |
737 |
} |
738 |
|
739 |
} |