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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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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 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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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 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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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 - 1. |
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*/ |
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private static 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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assertEquals((Integer) 0, q.peek()); |
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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 IllegalArgumentException if capacity argument nonpositive |
113 |
*/ |
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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 |
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*/ |
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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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shouldThrow(); |
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} catch (ClassCastException success) { |
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assertTrue(q.isEmpty()); |
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assertEquals(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 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 IllegalArgumentException |
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*/ |
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public void testAddAllSelf() { |
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PriorityBlockingQueue 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) {} |
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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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*/ |
265 |
public void testAddAll3() { |
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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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try { |
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q.addAll(Arrays.asList(ints)); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
274 |
} |
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|
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/** |
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* Queue contains all elements of successful addAll |
278 |
*/ |
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public void testAddAll5() { |
280 |
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); |
285 |
assertFalse(q.addAll(Arrays.asList(empty))); |
286 |
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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/** |
292 |
* all elements successfully put are contained |
293 |
*/ |
294 |
public void testPut() { |
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PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
297 |
Integer x = new Integer(i); |
298 |
q.put(x); |
299 |
assertTrue(q.contains(x)); |
300 |
} |
301 |
assertEquals(SIZE, q.size()); |
302 |
} |
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|
304 |
/** |
305 |
* put doesn't block waiting for take |
306 |
*/ |
307 |
public void testPutWithTake() throws InterruptedException { |
308 |
final PriorityBlockingQueue q = new PriorityBlockingQueue(2); |
309 |
final int size = 4; |
310 |
Thread t = newStartedThread(new CheckedRunnable() { |
311 |
public void realRun() { |
312 |
for (int i = 0; i < size; i++) |
313 |
q.put(new Integer(0)); |
314 |
}}); |
315 |
|
316 |
awaitTermination(t); |
317 |
assertEquals(size, q.size()); |
318 |
q.take(); |
319 |
} |
320 |
|
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/** |
322 |
* timed offer does not time out |
323 |
*/ |
324 |
public void testTimedOffer() { |
325 |
final PriorityBlockingQueue q = new PriorityBlockingQueue(2); |
326 |
Thread t = newStartedThread(new CheckedRunnable() { |
327 |
public void realRun() { |
328 |
q.put(new Integer(0)); |
329 |
q.put(new Integer(0)); |
330 |
assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, MILLISECONDS)); |
331 |
assertTrue(q.offer(new Integer(0), LONG_DELAY_MS, MILLISECONDS)); |
332 |
}}); |
333 |
|
334 |
awaitTermination(t); |
335 |
} |
336 |
|
337 |
/** |
338 |
* take retrieves elements in priority order |
339 |
*/ |
340 |
public void testTake() throws InterruptedException { |
341 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
342 |
for (int i = 0; i < SIZE; ++i) { |
343 |
assertEquals(i, q.take()); |
344 |
} |
345 |
} |
346 |
|
347 |
/** |
348 |
* Take removes existing elements until empty, then blocks interruptibly |
349 |
*/ |
350 |
public void testBlockingTake() throws InterruptedException { |
351 |
final PriorityBlockingQueue q = populatedQueue(SIZE); |
352 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
353 |
Thread t = newStartedThread(new CheckedRunnable() { |
354 |
public void realRun() throws InterruptedException { |
355 |
for (int i = 0; i < SIZE; i++) assertEquals(i, q.take()); |
356 |
|
357 |
Thread.currentThread().interrupt(); |
358 |
try { |
359 |
q.take(); |
360 |
shouldThrow(); |
361 |
} catch (InterruptedException success) {} |
362 |
assertFalse(Thread.interrupted()); |
363 |
|
364 |
pleaseInterrupt.countDown(); |
365 |
try { |
366 |
q.take(); |
367 |
shouldThrow(); |
368 |
} catch (InterruptedException success) {} |
369 |
assertFalse(Thread.interrupted()); |
370 |
}}); |
371 |
|
372 |
await(pleaseInterrupt); |
373 |
if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING); |
374 |
t.interrupt(); |
375 |
awaitTermination(t); |
376 |
} |
377 |
|
378 |
/** |
379 |
* poll succeeds unless empty |
380 |
*/ |
381 |
public void testPoll() { |
382 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
383 |
for (int i = 0; i < SIZE; ++i) { |
384 |
assertEquals(i, q.poll()); |
385 |
} |
386 |
assertNull(q.poll()); |
387 |
} |
388 |
|
389 |
/** |
390 |
* timed poll with zero timeout succeeds when non-empty, else times out |
391 |
*/ |
392 |
public void testTimedPoll0() throws InterruptedException { |
393 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
394 |
for (int i = 0; i < SIZE; ++i) { |
395 |
assertEquals(i, q.poll(0, MILLISECONDS)); |
396 |
} |
397 |
assertNull(q.poll(0, MILLISECONDS)); |
398 |
} |
399 |
|
400 |
/** |
401 |
* timed poll with nonzero timeout succeeds when non-empty, else times out |
402 |
*/ |
403 |
public void testTimedPoll() throws InterruptedException { |
404 |
PriorityBlockingQueue<Integer> q = populatedQueue(SIZE); |
405 |
for (int i = 0; i < SIZE; ++i) { |
406 |
long startTime = System.nanoTime(); |
407 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
408 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
409 |
} |
410 |
long startTime = System.nanoTime(); |
411 |
assertNull(q.poll(timeoutMillis(), MILLISECONDS)); |
412 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
413 |
checkEmpty(q); |
414 |
} |
415 |
|
416 |
/** |
417 |
* Interrupted timed poll throws InterruptedException instead of |
418 |
* returning timeout status |
419 |
*/ |
420 |
public void testInterruptedTimedPoll() throws InterruptedException { |
421 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
422 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
423 |
Thread t = newStartedThread(new CheckedRunnable() { |
424 |
public void realRun() throws InterruptedException { |
425 |
long startTime = System.nanoTime(); |
426 |
for (int i = 0; i < SIZE; i++) |
427 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
428 |
|
429 |
Thread.currentThread().interrupt(); |
430 |
try { |
431 |
q.poll(randomTimeout(), randomTimeUnit()); |
432 |
shouldThrow(); |
433 |
} catch (InterruptedException success) {} |
434 |
assertFalse(Thread.interrupted()); |
435 |
|
436 |
pleaseInterrupt.countDown(); |
437 |
try { |
438 |
q.poll(LONG_DELAY_MS, MILLISECONDS); |
439 |
shouldThrow(); |
440 |
} catch (InterruptedException success) {} |
441 |
assertFalse(Thread.interrupted()); |
442 |
|
443 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
444 |
}}); |
445 |
|
446 |
await(pleaseInterrupt); |
447 |
if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING); |
448 |
t.interrupt(); |
449 |
awaitTermination(t); |
450 |
} |
451 |
|
452 |
/** |
453 |
* peek returns next element, or null if empty |
454 |
*/ |
455 |
public void testPeek() { |
456 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
457 |
for (int i = 0; i < SIZE; ++i) { |
458 |
assertEquals(i, q.peek()); |
459 |
assertEquals(i, q.poll()); |
460 |
assertTrue(q.peek() == null || |
461 |
!q.peek().equals(i)); |
462 |
} |
463 |
assertNull(q.peek()); |
464 |
} |
465 |
|
466 |
/** |
467 |
* element returns next element, or throws NSEE if empty |
468 |
*/ |
469 |
public void testElement() { |
470 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
471 |
for (int i = 0; i < SIZE; ++i) { |
472 |
assertEquals(i, q.element()); |
473 |
assertEquals(i, q.poll()); |
474 |
} |
475 |
try { |
476 |
q.element(); |
477 |
shouldThrow(); |
478 |
} catch (NoSuchElementException success) {} |
479 |
} |
480 |
|
481 |
/** |
482 |
* remove removes next element, or throws NSEE if empty |
483 |
*/ |
484 |
public void testRemove() { |
485 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
486 |
for (int i = 0; i < SIZE; ++i) { |
487 |
assertEquals(i, q.remove()); |
488 |
} |
489 |
try { |
490 |
q.remove(); |
491 |
shouldThrow(); |
492 |
} catch (NoSuchElementException success) {} |
493 |
} |
494 |
|
495 |
/** |
496 |
* contains(x) reports true when elements added but not yet removed |
497 |
*/ |
498 |
public void testContains() { |
499 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
500 |
for (int i = 0; i < SIZE; ++i) { |
501 |
assertTrue(q.contains(new Integer(i))); |
502 |
q.poll(); |
503 |
assertFalse(q.contains(new Integer(i))); |
504 |
} |
505 |
} |
506 |
|
507 |
/** |
508 |
* clear removes all elements |
509 |
*/ |
510 |
public void testClear() { |
511 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
512 |
q.clear(); |
513 |
assertTrue(q.isEmpty()); |
514 |
assertEquals(0, q.size()); |
515 |
q.add(one); |
516 |
assertFalse(q.isEmpty()); |
517 |
assertTrue(q.contains(one)); |
518 |
q.clear(); |
519 |
assertTrue(q.isEmpty()); |
520 |
} |
521 |
|
522 |
/** |
523 |
* containsAll(c) is true when c contains a subset of elements |
524 |
*/ |
525 |
public void testContainsAll() { |
526 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
527 |
PriorityBlockingQueue p = new PriorityBlockingQueue(SIZE); |
528 |
for (int i = 0; i < SIZE; ++i) { |
529 |
assertTrue(q.containsAll(p)); |
530 |
assertFalse(p.containsAll(q)); |
531 |
p.add(new Integer(i)); |
532 |
} |
533 |
assertTrue(p.containsAll(q)); |
534 |
} |
535 |
|
536 |
/** |
537 |
* retainAll(c) retains only those elements of c and reports true if changed |
538 |
*/ |
539 |
public void testRetainAll() { |
540 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
541 |
PriorityBlockingQueue p = populatedQueue(SIZE); |
542 |
for (int i = 0; i < SIZE; ++i) { |
543 |
boolean changed = q.retainAll(p); |
544 |
if (i == 0) |
545 |
assertFalse(changed); |
546 |
else |
547 |
assertTrue(changed); |
548 |
|
549 |
assertTrue(q.containsAll(p)); |
550 |
assertEquals(SIZE - i, q.size()); |
551 |
p.remove(); |
552 |
} |
553 |
} |
554 |
|
555 |
/** |
556 |
* removeAll(c) removes only those elements of c and reports true if changed |
557 |
*/ |
558 |
public void testRemoveAll() { |
559 |
for (int i = 1; i < SIZE; ++i) { |
560 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
561 |
PriorityBlockingQueue p = populatedQueue(i); |
562 |
assertTrue(q.removeAll(p)); |
563 |
assertEquals(SIZE - i, q.size()); |
564 |
for (int j = 0; j < i; ++j) { |
565 |
Integer x = (Integer)(p.remove()); |
566 |
assertFalse(q.contains(x)); |
567 |
} |
568 |
} |
569 |
} |
570 |
|
571 |
/** |
572 |
* toArray contains all elements |
573 |
*/ |
574 |
public void testToArray() throws InterruptedException { |
575 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
576 |
Object[] a = q.toArray(); |
577 |
assertSame(Object[].class, a.getClass()); |
578 |
Arrays.sort(a); |
579 |
for (Object o : a) |
580 |
assertSame(o, q.take()); |
581 |
assertTrue(q.isEmpty()); |
582 |
} |
583 |
|
584 |
/** |
585 |
* toArray(a) contains all elements |
586 |
*/ |
587 |
public void testToArray2() throws InterruptedException { |
588 |
PriorityBlockingQueue<Integer> q = populatedQueue(SIZE); |
589 |
Integer[] ints = new Integer[SIZE]; |
590 |
Integer[] array = q.toArray(ints); |
591 |
assertSame(ints, array); |
592 |
Arrays.sort(ints); |
593 |
for (Integer o : ints) |
594 |
assertSame(o, q.take()); |
595 |
assertTrue(q.isEmpty()); |
596 |
} |
597 |
|
598 |
/** |
599 |
* toArray(incompatible array type) throws ArrayStoreException |
600 |
*/ |
601 |
public void testToArray1_BadArg() { |
602 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
603 |
try { |
604 |
q.toArray(new String[10]); |
605 |
shouldThrow(); |
606 |
} catch (ArrayStoreException success) {} |
607 |
} |
608 |
|
609 |
/** |
610 |
* iterator iterates through all elements |
611 |
*/ |
612 |
public void testIterator() { |
613 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
614 |
Iterator it = q.iterator(); |
615 |
int i; |
616 |
for (i = 0; it.hasNext(); i++) |
617 |
assertTrue(q.contains(it.next())); |
618 |
assertEquals(i, SIZE); |
619 |
assertIteratorExhausted(it); |
620 |
} |
621 |
|
622 |
/** |
623 |
* iterator of empty collection has no elements |
624 |
*/ |
625 |
public void testEmptyIterator() { |
626 |
assertIteratorExhausted(new PriorityBlockingQueue().iterator()); |
627 |
} |
628 |
|
629 |
/** |
630 |
* iterator.remove removes current element |
631 |
*/ |
632 |
public void testIteratorRemove() { |
633 |
final PriorityBlockingQueue q = new PriorityBlockingQueue(3); |
634 |
q.add(new Integer(2)); |
635 |
q.add(new Integer(1)); |
636 |
q.add(new Integer(3)); |
637 |
|
638 |
Iterator it = q.iterator(); |
639 |
it.next(); |
640 |
it.remove(); |
641 |
|
642 |
it = q.iterator(); |
643 |
assertEquals(it.next(), new Integer(2)); |
644 |
assertEquals(it.next(), new Integer(3)); |
645 |
assertFalse(it.hasNext()); |
646 |
} |
647 |
|
648 |
/** |
649 |
* toString contains toStrings of elements |
650 |
*/ |
651 |
public void testToString() { |
652 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
653 |
String s = q.toString(); |
654 |
for (int i = 0; i < SIZE; ++i) { |
655 |
assertTrue(s.contains(String.valueOf(i))); |
656 |
} |
657 |
} |
658 |
|
659 |
/** |
660 |
* timed poll transfers elements across Executor tasks |
661 |
*/ |
662 |
public void testPollInExecutor() { |
663 |
final PriorityBlockingQueue q = new PriorityBlockingQueue(2); |
664 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
665 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
666 |
try (PoolCleaner cleaner = cleaner(executor)) { |
667 |
executor.execute(new CheckedRunnable() { |
668 |
public void realRun() throws InterruptedException { |
669 |
assertNull(q.poll()); |
670 |
threadsStarted.await(); |
671 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
672 |
checkEmpty(q); |
673 |
}}); |
674 |
|
675 |
executor.execute(new CheckedRunnable() { |
676 |
public void realRun() throws InterruptedException { |
677 |
threadsStarted.await(); |
678 |
q.put(one); |
679 |
}}); |
680 |
} |
681 |
} |
682 |
|
683 |
/** |
684 |
* A deserialized/reserialized queue has same elements |
685 |
*/ |
686 |
public void testSerialization() throws Exception { |
687 |
Queue x = populatedQueue(SIZE); |
688 |
Queue y = serialClone(x); |
689 |
|
690 |
assertNotSame(x, y); |
691 |
assertEquals(x.size(), y.size()); |
692 |
while (!x.isEmpty()) { |
693 |
assertFalse(y.isEmpty()); |
694 |
assertEquals(x.remove(), y.remove()); |
695 |
} |
696 |
assertTrue(y.isEmpty()); |
697 |
} |
698 |
|
699 |
/** |
700 |
* drainTo(c) empties queue into another collection c |
701 |
*/ |
702 |
public void testDrainTo() { |
703 |
PriorityBlockingQueue q = populatedQueue(SIZE); |
704 |
ArrayList l = new ArrayList(); |
705 |
q.drainTo(l); |
706 |
assertEquals(0, q.size()); |
707 |
assertEquals(SIZE, l.size()); |
708 |
for (int i = 0; i < SIZE; ++i) |
709 |
assertEquals(l.get(i), new Integer(i)); |
710 |
q.add(zero); |
711 |
q.add(one); |
712 |
assertFalse(q.isEmpty()); |
713 |
assertTrue(q.contains(zero)); |
714 |
assertTrue(q.contains(one)); |
715 |
l.clear(); |
716 |
q.drainTo(l); |
717 |
assertEquals(0, q.size()); |
718 |
assertEquals(2, l.size()); |
719 |
for (int i = 0; i < 2; ++i) |
720 |
assertEquals(l.get(i), new Integer(i)); |
721 |
} |
722 |
|
723 |
/** |
724 |
* drainTo empties queue |
725 |
*/ |
726 |
public void testDrainToWithActivePut() throws InterruptedException { |
727 |
final PriorityBlockingQueue q = populatedQueue(SIZE); |
728 |
Thread t = new Thread(new CheckedRunnable() { |
729 |
public void realRun() { |
730 |
q.put(new Integer(SIZE + 1)); |
731 |
}}); |
732 |
|
733 |
t.start(); |
734 |
ArrayList l = new ArrayList(); |
735 |
q.drainTo(l); |
736 |
assertTrue(l.size() >= SIZE); |
737 |
for (int i = 0; i < SIZE; ++i) |
738 |
assertEquals(l.get(i), new Integer(i)); |
739 |
t.join(); |
740 |
assertTrue(q.size() + l.size() >= SIZE); |
741 |
} |
742 |
|
743 |
/** |
744 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
745 |
*/ |
746 |
public void testDrainToN() { |
747 |
PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE * 2); |
748 |
for (int i = 0; i < SIZE + 2; ++i) { |
749 |
for (int j = 0; j < SIZE; j++) |
750 |
assertTrue(q.offer(new Integer(j))); |
751 |
ArrayList l = new ArrayList(); |
752 |
q.drainTo(l, i); |
753 |
int k = (i < SIZE) ? i : SIZE; |
754 |
assertEquals(k, l.size()); |
755 |
assertEquals(SIZE - k, q.size()); |
756 |
for (int j = 0; j < k; ++j) |
757 |
assertEquals(l.get(j), new Integer(j)); |
758 |
do {} while (q.poll() != null); |
759 |
} |
760 |
} |
761 |
|
762 |
/** |
763 |
* remove(null), contains(null) always return false |
764 |
*/ |
765 |
public void testNeverContainsNull() { |
766 |
Collection<?>[] qs = { |
767 |
new PriorityBlockingQueue<Object>(), |
768 |
populatedQueue(2), |
769 |
}; |
770 |
|
771 |
for (Collection<?> q : qs) { |
772 |
assertFalse(q.contains(null)); |
773 |
assertFalse(q.remove(null)); |
774 |
} |
775 |
} |
776 |
|
777 |
} |