1 |
/* |
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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; |
10 |
|
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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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import java.util.concurrent.ThreadLocalRandom; |
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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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ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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int initialCapacity = rnd.nextInt(1, SIZE); |
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return new PriorityBlockingQueue(initialCapacity); |
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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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main(suite(), args); |
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} |
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|
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public static Test suite() { |
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class Implementation implements CollectionImplementation { |
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public Class<?> klazz() { return PriorityBlockingQueue.class; } |
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public Collection emptyCollection() { |
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return new PriorityBlockingQueue(); |
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} |
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public Object makeElement(int i) { return JSR166TestCase.itemFor(i); } |
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public boolean isConcurrent() { return true; } |
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public boolean permitsNulls() { return false; } |
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} |
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class ComparatorImplementation implements CollectionImplementation { |
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public Class<?> klazz() { return PriorityBlockingQueue.class; } |
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@SuppressWarnings("unchecked") |
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public Collection emptyCollection() { |
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ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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int initialCapacity = rnd.nextInt(1, 10); |
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return new PriorityBlockingQueue( |
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initialCapacity, new MyReverseComparator()); |
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} |
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public Object makeElement(int i) { return JSR166TestCase.itemFor(i); } |
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public boolean isConcurrent() { return true; } |
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public boolean permitsNulls() { return false; } |
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} |
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return newTestSuite( |
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PriorityBlockingQueueTest.class, |
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new Generic().testSuite(), |
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new InitialCapacity().testSuite(), |
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CollectionTest.testSuite(new Implementation()), |
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CollectionTest.testSuite(new ComparatorImplementation())); |
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} |
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|
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/** Sample Comparator */ |
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static class MyReverseComparator implements Comparator, java.io.Serializable { |
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@SuppressWarnings("unchecked") |
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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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* Items 0 ... n - 1. |
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*/ |
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private static PriorityBlockingQueue<Item> populatedQueue(int n) { |
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PriorityBlockingQueue<Item> q = |
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new PriorityBlockingQueue<Item>(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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mustOffer(q, i); |
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for (int i = (n & 1); i < n; i += 2) |
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mustOffer(q, i); |
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assertFalse(q.isEmpty()); |
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mustEqual(Integer.MAX_VALUE, q.remainingCapacity()); |
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mustEqual(n, q.size()); |
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mustEqual(0, q.peek()); |
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return q; |
103 |
} |
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|
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/** |
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* A new queue has unbounded capacity |
107 |
*/ |
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public void testConstructor1() { |
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mustEqual(Integer.MAX_VALUE, |
110 |
new PriorityBlockingQueue<Item>(SIZE).remainingCapacity()); |
111 |
} |
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|
113 |
/** |
114 |
* Constructor throws IllegalArgumentException if capacity argument nonpositive |
115 |
*/ |
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public void testConstructor2() { |
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try { |
118 |
new PriorityBlockingQueue<Item>(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 |
125 |
*/ |
126 |
public void testConstructor3() { |
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try { |
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new PriorityBlockingQueue<Item>(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 |
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*/ |
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public void testConstructor4() { |
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Collection<Item> elements = Arrays.asList(new Item[SIZE]); |
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try { |
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new PriorityBlockingQueue<Item>(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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Item[] items = new Item[2]; items[0] = zero; |
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Collection<Item> elements = Arrays.asList(items); |
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try { |
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new PriorityBlockingQueue<Item>(elements); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
154 |
} |
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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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Item[] items = defaultItems; |
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<Item>(Arrays.asList(items)); |
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for (int i = 0; i < SIZE; ++i) |
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mustEqual(items[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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@SuppressWarnings("unchecked") |
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<Item>(SIZE, cmp); |
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mustEqual(cmp, q.comparator()); |
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Item[] items = defaultItems; |
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q.addAll(Arrays.asList(items)); |
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for (int i = SIZE - 1; i >= 0; --i) |
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mustEqual(items[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<Item> q = new PriorityBlockingQueue<Item>(2); |
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assertTrue(q.isEmpty()); |
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mustEqual(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<Item> q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(Integer.MAX_VALUE, q.remainingCapacity()); |
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mustEqual(SIZE - i, q.size()); |
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mustEqual(i, q.remove()); |
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} |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(Integer.MAX_VALUE, q.remainingCapacity()); |
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mustEqual(i, q.size()); |
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mustAdd(q, 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<Item> q = new PriorityBlockingQueue<Item>(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<Object> q = new PriorityBlockingQueue<Object>(1); |
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try { |
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q.offer(new Object()); |
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shouldThrow(); |
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} catch (ClassCastException success) { |
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assertTrue(q.isEmpty()); |
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mustEqual(0, q.size()); |
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assertNull(q.poll()); |
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} |
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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<Item> q = new PriorityBlockingQueue<Item>(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(i, q.size()); |
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mustAdd(q, i); |
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} |
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} |
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|
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/** |
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* addAll(this) throws IllegalArgumentException |
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*/ |
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public void testAddAllSelf() { |
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PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
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try { |
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q.addAll(q); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
256 |
} |
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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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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<Item>(SIZE); |
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Item[] items = new Item[2]; |
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items[0] = zero; |
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try { |
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q.addAll(Arrays.asList(items)); |
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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 |
274 |
*/ |
275 |
public void testAddAll5() { |
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Item[] empty = new Item[0]; |
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Item[] items = defaultItems; |
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<Item>(SIZE); |
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assertFalse(q.addAll(Arrays.asList(empty))); |
280 |
assertTrue(q.addAll(Arrays.asList(items))); |
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for (int i = 0; i < SIZE; ++i) |
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mustEqual(items[i], q.poll()); |
283 |
} |
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|
285 |
/** |
286 |
* all elements successfully put are contained |
287 |
*/ |
288 |
public void testPut() { |
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<Item>(SIZE); |
290 |
for (int i = 0; i < SIZE; ++i) { |
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Item x = itemFor(i); |
292 |
q.put(x); |
293 |
mustContain(q, x); |
294 |
} |
295 |
mustEqual(SIZE, q.size()); |
296 |
} |
297 |
|
298 |
/** |
299 |
* put doesn't block waiting for take |
300 |
*/ |
301 |
public void testPutWithTake() throws InterruptedException { |
302 |
final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<Item>(2); |
303 |
final int size = 4; |
304 |
Thread t = newStartedThread(new CheckedRunnable() { |
305 |
public void realRun() { |
306 |
for (int i = 0; i < size; i++) |
307 |
q.put(zero); |
308 |
}}); |
309 |
|
310 |
awaitTermination(t); |
311 |
mustEqual(size, q.size()); |
312 |
q.take(); |
313 |
} |
314 |
|
315 |
/** |
316 |
* Queue is unbounded, so timed offer never times out |
317 |
*/ |
318 |
public void testTimedOffer() { |
319 |
final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<Item>(2); |
320 |
Thread t = newStartedThread(new CheckedRunnable() { |
321 |
public void realRun() { |
322 |
q.put(one); |
323 |
q.put(two); |
324 |
assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS)); |
325 |
assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); |
326 |
}}); |
327 |
|
328 |
awaitTermination(t); |
329 |
} |
330 |
|
331 |
/** |
332 |
* take retrieves elements in priority order |
333 |
*/ |
334 |
public void testTake() throws InterruptedException { |
335 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
336 |
for (int i = 0; i < SIZE; ++i) { |
337 |
mustEqual(i, q.take()); |
338 |
} |
339 |
} |
340 |
|
341 |
/** |
342 |
* Take removes existing elements until empty, then blocks interruptibly |
343 |
*/ |
344 |
public void testBlockingTake() throws InterruptedException { |
345 |
final PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
346 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
347 |
Thread t = newStartedThread(new CheckedRunnable() { |
348 |
public void realRun() throws InterruptedException { |
349 |
for (int i = 0; i < SIZE; i++) mustEqual(i, q.take()); |
350 |
|
351 |
Thread.currentThread().interrupt(); |
352 |
try { |
353 |
q.take(); |
354 |
shouldThrow(); |
355 |
} catch (InterruptedException success) {} |
356 |
assertFalse(Thread.interrupted()); |
357 |
|
358 |
pleaseInterrupt.countDown(); |
359 |
try { |
360 |
q.take(); |
361 |
shouldThrow(); |
362 |
} catch (InterruptedException success) {} |
363 |
assertFalse(Thread.interrupted()); |
364 |
}}); |
365 |
|
366 |
await(pleaseInterrupt); |
367 |
if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING); |
368 |
t.interrupt(); |
369 |
awaitTermination(t); |
370 |
} |
371 |
|
372 |
/** |
373 |
* poll succeeds unless empty |
374 |
*/ |
375 |
public void testPoll() { |
376 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
377 |
for (int i = 0; i < SIZE; ++i) { |
378 |
mustEqual(i, q.poll()); |
379 |
} |
380 |
assertNull(q.poll()); |
381 |
} |
382 |
|
383 |
/** |
384 |
* timed poll with zero timeout succeeds when non-empty, else times out |
385 |
*/ |
386 |
public void testTimedPoll0() throws InterruptedException { |
387 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
388 |
for (int i = 0; i < SIZE; ++i) { |
389 |
mustEqual(i, q.poll(0, MILLISECONDS)); |
390 |
} |
391 |
assertNull(q.poll(0, MILLISECONDS)); |
392 |
} |
393 |
|
394 |
/** |
395 |
* timed poll with nonzero timeout succeeds when non-empty, else times out |
396 |
*/ |
397 |
public void testTimedPoll() throws InterruptedException { |
398 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
399 |
for (int i = 0; i < SIZE; ++i) { |
400 |
long startTime = System.nanoTime(); |
401 |
mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
402 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
403 |
} |
404 |
long startTime = System.nanoTime(); |
405 |
assertNull(q.poll(timeoutMillis(), MILLISECONDS)); |
406 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
407 |
checkEmpty(q); |
408 |
} |
409 |
|
410 |
/** |
411 |
* Interrupted timed poll throws InterruptedException instead of |
412 |
* returning timeout status |
413 |
*/ |
414 |
public void testInterruptedTimedPoll() throws InterruptedException { |
415 |
final BlockingQueue<Item> q = populatedQueue(SIZE); |
416 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
417 |
Thread t = newStartedThread(new CheckedRunnable() { |
418 |
public void realRun() throws InterruptedException { |
419 |
for (int i = 0; i < SIZE; i++) |
420 |
mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
421 |
|
422 |
Thread.currentThread().interrupt(); |
423 |
try { |
424 |
q.poll(randomTimeout(), randomTimeUnit()); |
425 |
shouldThrow(); |
426 |
} catch (InterruptedException success) {} |
427 |
assertFalse(Thread.interrupted()); |
428 |
|
429 |
pleaseInterrupt.countDown(); |
430 |
try { |
431 |
q.poll(LONGER_DELAY_MS, MILLISECONDS); |
432 |
shouldThrow(); |
433 |
} catch (InterruptedException success) {} |
434 |
assertFalse(Thread.interrupted()); |
435 |
}}); |
436 |
|
437 |
await(pleaseInterrupt); |
438 |
if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING); |
439 |
t.interrupt(); |
440 |
awaitTermination(t); |
441 |
} |
442 |
|
443 |
/** |
444 |
* peek returns next element, or null if empty |
445 |
*/ |
446 |
public void testPeek() { |
447 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
448 |
for (int i = 0; i < SIZE; ++i) { |
449 |
mustEqual(i, q.peek()); |
450 |
mustEqual(i, q.poll()); |
451 |
assertTrue(q.peek() == null || |
452 |
!q.peek().equals(i)); |
453 |
} |
454 |
assertNull(q.peek()); |
455 |
} |
456 |
|
457 |
/** |
458 |
* element returns next element, or throws NSEE if empty |
459 |
*/ |
460 |
public void testElement() { |
461 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
462 |
for (int i = 0; i < SIZE; ++i) { |
463 |
mustEqual(i, q.element()); |
464 |
mustEqual(i, q.poll()); |
465 |
} |
466 |
try { |
467 |
q.element(); |
468 |
shouldThrow(); |
469 |
} catch (NoSuchElementException success) {} |
470 |
} |
471 |
|
472 |
/** |
473 |
* remove removes next element, or throws NSEE if empty |
474 |
*/ |
475 |
public void testRemove() { |
476 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
477 |
for (int i = 0; i < SIZE; ++i) { |
478 |
mustEqual(i, q.remove()); |
479 |
} |
480 |
try { |
481 |
q.remove(); |
482 |
shouldThrow(); |
483 |
} catch (NoSuchElementException success) {} |
484 |
} |
485 |
|
486 |
/** |
487 |
* contains(x) reports true when elements added but not yet removed |
488 |
*/ |
489 |
public void testContains() { |
490 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
491 |
for (int i = 0; i < SIZE; ++i) { |
492 |
mustContain(q, i); |
493 |
q.poll(); |
494 |
mustNotContain(q, i); |
495 |
} |
496 |
} |
497 |
|
498 |
/** |
499 |
* clear removes all elements |
500 |
*/ |
501 |
public void testClear() { |
502 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
503 |
q.clear(); |
504 |
assertTrue(q.isEmpty()); |
505 |
mustEqual(0, q.size()); |
506 |
q.add(one); |
507 |
assertFalse(q.isEmpty()); |
508 |
mustContain(q, one); |
509 |
q.clear(); |
510 |
assertTrue(q.isEmpty()); |
511 |
} |
512 |
|
513 |
/** |
514 |
* containsAll(c) is true when c contains a subset of elements |
515 |
*/ |
516 |
public void testContainsAll() { |
517 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
518 |
PriorityBlockingQueue<Item> p = new PriorityBlockingQueue<Item>(SIZE); |
519 |
for (int i = 0; i < SIZE; ++i) { |
520 |
assertTrue(q.containsAll(p)); |
521 |
assertFalse(p.containsAll(q)); |
522 |
mustAdd(p, i); |
523 |
} |
524 |
assertTrue(p.containsAll(q)); |
525 |
} |
526 |
|
527 |
/** |
528 |
* retainAll(c) retains only those elements of c and reports true if changed |
529 |
*/ |
530 |
public void testRetainAll() { |
531 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
532 |
PriorityBlockingQueue<Item> p = populatedQueue(SIZE); |
533 |
for (int i = 0; i < SIZE; ++i) { |
534 |
boolean changed = q.retainAll(p); |
535 |
if (i == 0) |
536 |
assertFalse(changed); |
537 |
else |
538 |
assertTrue(changed); |
539 |
|
540 |
assertTrue(q.containsAll(p)); |
541 |
mustEqual(SIZE - i, q.size()); |
542 |
p.remove(); |
543 |
} |
544 |
} |
545 |
|
546 |
/** |
547 |
* removeAll(c) removes only those elements of c and reports true if changed |
548 |
*/ |
549 |
public void testRemoveAll() { |
550 |
for (int i = 1; i < SIZE; ++i) { |
551 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
552 |
PriorityBlockingQueue<Item> p = populatedQueue(i); |
553 |
assertTrue(q.removeAll(p)); |
554 |
mustEqual(SIZE - i, q.size()); |
555 |
for (int j = 0; j < i; ++j) { |
556 |
Item x = p.remove(); |
557 |
mustNotContain(q, x); |
558 |
} |
559 |
} |
560 |
} |
561 |
|
562 |
/** |
563 |
* toArray contains all elements |
564 |
*/ |
565 |
public void testToArray() throws InterruptedException { |
566 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
567 |
Object[] a = q.toArray(); |
568 |
assertSame(Object[].class, a.getClass()); |
569 |
Arrays.sort(a); |
570 |
for (Object o : a) |
571 |
assertSame(o, q.take()); |
572 |
assertTrue(q.isEmpty()); |
573 |
} |
574 |
|
575 |
/** |
576 |
* toArray(a) contains all elements |
577 |
*/ |
578 |
public void testToArray2() throws InterruptedException { |
579 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
580 |
Item[] items = new Item[SIZE]; |
581 |
Item[] array = q.toArray(items); |
582 |
assertSame(items, array); |
583 |
Arrays.sort(items); |
584 |
for (Item o : items) |
585 |
assertSame(o, q.take()); |
586 |
assertTrue(q.isEmpty()); |
587 |
} |
588 |
|
589 |
/** |
590 |
* toArray(incompatible array type) throws ArrayStoreException |
591 |
*/ |
592 |
public void testToArray1_BadArg() { |
593 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
594 |
try { |
595 |
q.toArray(new String[10]); |
596 |
shouldThrow(); |
597 |
} catch (ArrayStoreException success) {} |
598 |
} |
599 |
|
600 |
/** |
601 |
* iterator iterates through all elements |
602 |
*/ |
603 |
public void testIterator() { |
604 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
605 |
Iterator<? extends Item> it = q.iterator(); |
606 |
int i; |
607 |
for (i = 0; it.hasNext(); i++) |
608 |
mustContain(q, it.next()); |
609 |
mustEqual(i, SIZE); |
610 |
assertIteratorExhausted(it); |
611 |
} |
612 |
|
613 |
/** |
614 |
* iterator of empty collection has no elements |
615 |
*/ |
616 |
public void testEmptyIterator() { |
617 |
assertIteratorExhausted(new PriorityBlockingQueue<Item>().iterator()); |
618 |
} |
619 |
|
620 |
/** |
621 |
* iterator.remove removes current element |
622 |
*/ |
623 |
public void testIteratorRemove() { |
624 |
final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<Item>(3); |
625 |
q.add(two); |
626 |
q.add(one); |
627 |
q.add(three); |
628 |
|
629 |
Iterator<? extends Item> it = q.iterator(); |
630 |
it.next(); |
631 |
it.remove(); |
632 |
|
633 |
it = q.iterator(); |
634 |
mustEqual(it.next(), two); |
635 |
mustEqual(it.next(), three); |
636 |
assertFalse(it.hasNext()); |
637 |
} |
638 |
|
639 |
/** |
640 |
* toString contains toStrings of elements |
641 |
*/ |
642 |
public void testToString() { |
643 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
644 |
String s = q.toString(); |
645 |
for (int i = 0; i < SIZE; ++i) { |
646 |
assertTrue(s.contains(String.valueOf(i))); |
647 |
} |
648 |
} |
649 |
|
650 |
/** |
651 |
* timed poll transfers elements across Executor tasks |
652 |
*/ |
653 |
public void testPollInExecutor() { |
654 |
final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<Item>(2); |
655 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
656 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
657 |
try (PoolCleaner cleaner = cleaner(executor)) { |
658 |
executor.execute(new CheckedRunnable() { |
659 |
public void realRun() throws InterruptedException { |
660 |
assertNull(q.poll()); |
661 |
threadsStarted.await(); |
662 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
663 |
checkEmpty(q); |
664 |
}}); |
665 |
|
666 |
executor.execute(new CheckedRunnable() { |
667 |
public void realRun() throws InterruptedException { |
668 |
threadsStarted.await(); |
669 |
q.put(one); |
670 |
}}); |
671 |
} |
672 |
} |
673 |
|
674 |
/** |
675 |
* A deserialized/reserialized queue has same elements |
676 |
*/ |
677 |
public void testSerialization() throws Exception { |
678 |
Queue<Item> x = populatedQueue(SIZE); |
679 |
Queue<Item> y = serialClone(x); |
680 |
|
681 |
assertNotSame(x, y); |
682 |
mustEqual(x.size(), y.size()); |
683 |
while (!x.isEmpty()) { |
684 |
assertFalse(y.isEmpty()); |
685 |
mustEqual(x.remove(), y.remove()); |
686 |
} |
687 |
assertTrue(y.isEmpty()); |
688 |
} |
689 |
|
690 |
/** |
691 |
* drainTo(c) empties queue into another collection c |
692 |
*/ |
693 |
public void testDrainTo() { |
694 |
PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
695 |
ArrayList<Item> l = new ArrayList<Item>(); |
696 |
q.drainTo(l); |
697 |
mustEqual(0, q.size()); |
698 |
mustEqual(SIZE, l.size()); |
699 |
for (int i = 0; i < SIZE; ++i) |
700 |
mustEqual(l.get(i), i); |
701 |
q.add(zero); |
702 |
q.add(one); |
703 |
assertFalse(q.isEmpty()); |
704 |
mustContain(q, one); |
705 |
l.clear(); |
706 |
q.drainTo(l); |
707 |
mustEqual(0, q.size()); |
708 |
mustEqual(2, l.size()); |
709 |
for (int i = 0; i < 2; ++i) |
710 |
mustEqual(l.get(i), i); |
711 |
} |
712 |
|
713 |
/** |
714 |
* drainTo empties queue |
715 |
*/ |
716 |
public void testDrainToWithActivePut() throws InterruptedException { |
717 |
final PriorityBlockingQueue<Item> q = populatedQueue(SIZE); |
718 |
Thread t = new Thread(new CheckedRunnable() { |
719 |
public void realRun() { |
720 |
q.put(new Item(SIZE + 1)); |
721 |
}}); |
722 |
|
723 |
t.start(); |
724 |
ArrayList<Item> l = new ArrayList<Item>(); |
725 |
q.drainTo(l); |
726 |
assertTrue(l.size() >= SIZE); |
727 |
for (int i = 0; i < SIZE; ++i) |
728 |
mustEqual(l.get(i), i); |
729 |
t.join(); |
730 |
assertTrue(q.size() + l.size() >= SIZE); |
731 |
} |
732 |
|
733 |
/** |
734 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
735 |
*/ |
736 |
public void testDrainToN() { |
737 |
PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<Item>(SIZE * 2); |
738 |
for (int i = 0; i < SIZE + 2; ++i) { |
739 |
for (int j = 0; j < SIZE; j++) |
740 |
mustOffer(q, j); |
741 |
ArrayList<Item> l = new ArrayList<Item>(); |
742 |
q.drainTo(l, i); |
743 |
int k = (i < SIZE) ? i : SIZE; |
744 |
mustEqual(k, l.size()); |
745 |
mustEqual(SIZE - k, q.size()); |
746 |
for (int j = 0; j < k; ++j) |
747 |
mustEqual(l.get(j), j); |
748 |
do {} while (q.poll() != null); |
749 |
} |
750 |
} |
751 |
|
752 |
/** |
753 |
* remove(null), contains(null) always return false |
754 |
*/ |
755 |
public void testNeverContainsNull() { |
756 |
Collection<?>[] qs = { |
757 |
new PriorityBlockingQueue<Object>(), |
758 |
populatedQueue(2), |
759 |
}; |
760 |
|
761 |
for (Collection<?> q : qs) { |
762 |
assertFalse(q.contains(null)); |
763 |
assertFalse(q.remove(null)); |
764 |
} |
765 |
} |
766 |
|
767 |
} |