1 |
/* |
2 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
* 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. |
7 |
*/ |
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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.Collections; |
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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.ArrayBlockingQueue; |
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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.ThreadLocalRandom; |
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|
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import junit.framework.Test; |
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|
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public class ArrayBlockingQueueTest extends JSR166TestCase { |
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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 ArrayBlockingQueue.class; } |
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public Collection emptyCollection() { |
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boolean fair = ThreadLocalRandom.current().nextBoolean(); |
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return populatedQueue(0, SIZE, 2 * SIZE, fair); |
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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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|
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return newTestSuite( |
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ArrayBlockingQueueTest.class, |
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new Fair().testSuite(), |
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new NonFair().testSuite(), |
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CollectionTest.testSuite(new Implementation())); |
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} |
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|
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public static class Fair extends BlockingQueueTest { |
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protected BlockingQueue emptyCollection() { |
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return populatedQueue(0, SIZE, 2 * SIZE, true); |
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} |
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} |
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|
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public static class NonFair extends BlockingQueueTest { |
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protected BlockingQueue emptyCollection() { |
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return populatedQueue(0, SIZE, 2 * SIZE, false); |
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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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static ArrayBlockingQueue<Integer> populatedQueue(int n) { |
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return populatedQueue(n, n, n, false); |
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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, with given capacity range and fairness. |
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*/ |
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static ArrayBlockingQueue<Integer> populatedQueue( |
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int size, int minCapacity, int maxCapacity, boolean fair) { |
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ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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int capacity = rnd.nextInt(minCapacity, maxCapacity + 1); |
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ArrayBlockingQueue<Integer> q = new ArrayBlockingQueue<>(capacity); |
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assertTrue(q.isEmpty()); |
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// shuffle circular array elements so they wrap |
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{ |
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int n = rnd.nextInt(capacity); |
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for (int i = 0; i < n; i++) q.add(42); |
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for (int i = 0; i < n; i++) q.remove(); |
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} |
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for (int i = 0; i < size; i++) |
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assertTrue(q.offer((Integer) i)); |
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assertEquals(size == 0, q.isEmpty()); |
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assertEquals(capacity - size, q.remainingCapacity()); |
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assertEquals(size, q.size()); |
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if (size > 0) |
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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 the indicated capacity |
100 |
*/ |
101 |
public void testConstructor1() { |
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assertEquals(SIZE, new ArrayBlockingQueue(SIZE).remainingCapacity()); |
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} |
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|
105 |
/** |
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* Constructor throws IAE if capacity argument nonpositive |
107 |
*/ |
108 |
public void testConstructor_nonPositiveCapacity() { |
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for (int i : new int[] { 0, -1, Integer.MIN_VALUE }) { |
110 |
try { |
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new ArrayBlockingQueue(i); |
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shouldThrow(); |
113 |
} catch (IllegalArgumentException success) {} |
114 |
for (boolean fair : new boolean[] { true, false }) { |
115 |
try { |
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new ArrayBlockingQueue(i, fair); |
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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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|
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/** |
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* Initializing from null Collection throws NPE |
125 |
*/ |
126 |
public void testConstructor_nullCollection() { |
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try { |
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new ArrayBlockingQueue(1, true, 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 |
135 |
*/ |
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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 ArrayBlockingQueue(SIZE, false, 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 ArrayBlockingQueue(SIZE, false, 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 too large collection throws IAE |
160 |
*/ |
161 |
public void testConstructor_collectionTooLarge() { |
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// just barely fits - succeeds |
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new ArrayBlockingQueue(SIZE, false, |
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Collections.nCopies(SIZE, "")); |
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try { |
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new ArrayBlockingQueue(SIZE - 1, false, |
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Collections.nCopies(SIZE, "")); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
170 |
} |
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|
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/** |
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* Queue contains all elements of collection used to initialize |
174 |
*/ |
175 |
public void testConstructor7() { |
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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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Collection<Integer> elements = Arrays.asList(ints); |
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ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE, true, elements); |
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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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* Queue transitions from empty to full when elements added |
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*/ |
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public void testEmptyFull() { |
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BlockingQueue q = populatedQueue(0, 2, 2, false); |
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assertTrue(q.isEmpty()); |
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assertEquals(2, q.remainingCapacity()); |
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q.add(one); |
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assertFalse(q.isEmpty()); |
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assertTrue(q.offer(two)); |
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assertFalse(q.isEmpty()); |
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assertEquals(0, q.remainingCapacity()); |
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assertFalse(q.offer(three)); |
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} |
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|
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/** |
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* remainingCapacity decreases on add, increases on remove |
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*/ |
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public void testRemainingCapacity() { |
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int size = ThreadLocalRandom.current().nextInt(1, SIZE); |
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BlockingQueue q = populatedQueue(size, size, 2 * size, false); |
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int spare = q.remainingCapacity(); |
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int capacity = spare + size; |
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for (int i = 0; i < size; i++) { |
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assertEquals(spare + i, q.remainingCapacity()); |
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assertEquals(capacity, q.size() + q.remainingCapacity()); |
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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(capacity - i, q.remainingCapacity()); |
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assertEquals(capacity, q.size() + q.remainingCapacity()); |
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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 succeeds if not full; fails if full |
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*/ |
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public void testOffer() { |
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ArrayBlockingQueue q = new ArrayBlockingQueue(1); |
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assertTrue(q.offer(zero)); |
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assertFalse(q.offer(one)); |
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} |
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|
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/** |
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* add succeeds if not full; throws ISE if full |
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*/ |
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public void testAdd() { |
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ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
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for (int i = 0; i < SIZE; i++) assertTrue(q.add((Integer) i)); |
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assertEquals(0, q.remainingCapacity()); |
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try { |
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q.add((Integer) SIZE); |
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shouldThrow(); |
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} catch (IllegalStateException success) {} |
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} |
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|
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/** |
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* addAll(this) throws IAE |
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*/ |
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public void testAddAllSelf() { |
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ArrayBlockingQueue q = populatedQueue(SIZE); |
247 |
try { |
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q.addAll(q); |
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shouldThrow(); |
250 |
} 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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ArrayBlockingQueue q = new ArrayBlockingQueue(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); |
262 |
try { |
263 |
q.addAll(Arrays.asList(ints)); |
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shouldThrow(); |
265 |
} catch (NullPointerException success) {} |
266 |
} |
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|
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/** |
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* addAll throws ISE if not enough room |
270 |
*/ |
271 |
public void testAddAll_insufficientSpace() { |
272 |
int size = ThreadLocalRandom.current().nextInt(SIZE); |
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ArrayBlockingQueue q = populatedQueue(0, size, size, false); |
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// Just fits: |
275 |
q.addAll(populatedQueue(size, size, 2 * size, false)); |
276 |
assertEquals(0, q.remainingCapacity()); |
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assertEquals(size, q.size()); |
278 |
assertEquals(0, q.peek()); |
279 |
try { |
280 |
q = populatedQueue(0, size, size, false); |
281 |
q.addAll(Collections.nCopies(size + 1, 42)); |
282 |
shouldThrow(); |
283 |
} catch (IllegalStateException success) {} |
284 |
} |
285 |
|
286 |
/** |
287 |
* Queue contains all elements, in traversal order, of successful addAll |
288 |
*/ |
289 |
public void testAddAll5() { |
290 |
Integer[] empty = new Integer[0]; |
291 |
Integer[] ints = new Integer[SIZE]; |
292 |
for (int i = 0; i < SIZE; ++i) |
293 |
ints[i] = new Integer(i); |
294 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
295 |
assertFalse(q.addAll(Arrays.asList(empty))); |
296 |
assertTrue(q.addAll(Arrays.asList(ints))); |
297 |
for (int i = 0; i < SIZE; ++i) |
298 |
assertEquals(ints[i], q.poll()); |
299 |
} |
300 |
|
301 |
/** |
302 |
* all elements successfully put are contained |
303 |
*/ |
304 |
public void testPut() throws InterruptedException { |
305 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
306 |
for (int i = 0; i < SIZE; ++i) { |
307 |
Integer x = new Integer(i); |
308 |
q.put(x); |
309 |
assertTrue(q.contains(x)); |
310 |
} |
311 |
assertEquals(0, q.remainingCapacity()); |
312 |
} |
313 |
|
314 |
/** |
315 |
* put blocks interruptibly if full |
316 |
*/ |
317 |
public void testBlockingPut() throws InterruptedException { |
318 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
319 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
320 |
Thread t = newStartedThread(new CheckedRunnable() { |
321 |
public void realRun() throws InterruptedException { |
322 |
for (int i = 0; i < SIZE; ++i) |
323 |
q.put(i); |
324 |
assertEquals(SIZE, q.size()); |
325 |
assertEquals(0, q.remainingCapacity()); |
326 |
|
327 |
Thread.currentThread().interrupt(); |
328 |
try { |
329 |
q.put(99); |
330 |
shouldThrow(); |
331 |
} catch (InterruptedException success) {} |
332 |
assertFalse(Thread.interrupted()); |
333 |
|
334 |
pleaseInterrupt.countDown(); |
335 |
try { |
336 |
q.put(99); |
337 |
shouldThrow(); |
338 |
} catch (InterruptedException success) {} |
339 |
assertFalse(Thread.interrupted()); |
340 |
}}); |
341 |
|
342 |
await(pleaseInterrupt); |
343 |
assertThreadStaysAlive(t); |
344 |
t.interrupt(); |
345 |
awaitTermination(t); |
346 |
assertEquals(SIZE, q.size()); |
347 |
assertEquals(0, q.remainingCapacity()); |
348 |
} |
349 |
|
350 |
/** |
351 |
* put blocks interruptibly waiting for take when full |
352 |
*/ |
353 |
public void testPutWithTake() throws InterruptedException { |
354 |
final int capacity = 2; |
355 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(capacity); |
356 |
final CountDownLatch pleaseTake = new CountDownLatch(1); |
357 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
358 |
Thread t = newStartedThread(new CheckedRunnable() { |
359 |
public void realRun() throws InterruptedException { |
360 |
for (int i = 0; i < capacity; i++) |
361 |
q.put(i); |
362 |
pleaseTake.countDown(); |
363 |
q.put(86); |
364 |
|
365 |
pleaseInterrupt.countDown(); |
366 |
try { |
367 |
q.put(99); |
368 |
shouldThrow(); |
369 |
} catch (InterruptedException success) {} |
370 |
assertFalse(Thread.interrupted()); |
371 |
}}); |
372 |
|
373 |
await(pleaseTake); |
374 |
assertEquals(0, q.remainingCapacity()); |
375 |
assertEquals(0, q.take()); |
376 |
|
377 |
await(pleaseInterrupt); |
378 |
assertThreadStaysAlive(t); |
379 |
t.interrupt(); |
380 |
awaitTermination(t); |
381 |
assertEquals(0, q.remainingCapacity()); |
382 |
} |
383 |
|
384 |
/** |
385 |
* timed offer times out if full and elements not taken |
386 |
*/ |
387 |
public void testTimedOffer() throws InterruptedException { |
388 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
389 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
390 |
Thread t = newStartedThread(new CheckedRunnable() { |
391 |
public void realRun() throws InterruptedException { |
392 |
q.put(new Object()); |
393 |
q.put(new Object()); |
394 |
long startTime = System.nanoTime(); |
395 |
assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS)); |
396 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
397 |
pleaseInterrupt.countDown(); |
398 |
try { |
399 |
q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS); |
400 |
shouldThrow(); |
401 |
} catch (InterruptedException success) {} |
402 |
}}); |
403 |
|
404 |
await(pleaseInterrupt); |
405 |
assertThreadStaysAlive(t); |
406 |
t.interrupt(); |
407 |
awaitTermination(t); |
408 |
} |
409 |
|
410 |
/** |
411 |
* take retrieves elements in FIFO order |
412 |
*/ |
413 |
public void testTake() throws InterruptedException { |
414 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
415 |
for (int i = 0; i < SIZE; ++i) { |
416 |
assertEquals(i, q.take()); |
417 |
} |
418 |
} |
419 |
|
420 |
/** |
421 |
* Take removes existing elements until empty, then blocks interruptibly |
422 |
*/ |
423 |
public void testBlockingTake() throws InterruptedException { |
424 |
final ArrayBlockingQueue q = populatedQueue(SIZE); |
425 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
426 |
Thread t = newStartedThread(new CheckedRunnable() { |
427 |
public void realRun() throws InterruptedException { |
428 |
for (int i = 0; i < SIZE; ++i) { |
429 |
assertEquals(i, q.take()); |
430 |
} |
431 |
|
432 |
Thread.currentThread().interrupt(); |
433 |
try { |
434 |
q.take(); |
435 |
shouldThrow(); |
436 |
} catch (InterruptedException success) {} |
437 |
assertFalse(Thread.interrupted()); |
438 |
|
439 |
pleaseInterrupt.countDown(); |
440 |
try { |
441 |
q.take(); |
442 |
shouldThrow(); |
443 |
} catch (InterruptedException success) {} |
444 |
assertFalse(Thread.interrupted()); |
445 |
}}); |
446 |
|
447 |
await(pleaseInterrupt); |
448 |
assertThreadStaysAlive(t); |
449 |
t.interrupt(); |
450 |
awaitTermination(t); |
451 |
} |
452 |
|
453 |
/** |
454 |
* poll succeeds unless empty |
455 |
*/ |
456 |
public void testPoll() { |
457 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
458 |
for (int i = 0; i < SIZE; ++i) { |
459 |
assertEquals(i, q.poll()); |
460 |
} |
461 |
assertNull(q.poll()); |
462 |
} |
463 |
|
464 |
/** |
465 |
* timed poll with zero timeout succeeds when non-empty, else times out |
466 |
*/ |
467 |
public void testTimedPoll0() throws InterruptedException { |
468 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
469 |
for (int i = 0; i < SIZE; ++i) { |
470 |
assertEquals(i, q.poll(0, MILLISECONDS)); |
471 |
} |
472 |
assertNull(q.poll(0, MILLISECONDS)); |
473 |
checkEmpty(q); |
474 |
} |
475 |
|
476 |
/** |
477 |
* timed poll with nonzero timeout succeeds when non-empty, else times out |
478 |
*/ |
479 |
public void testTimedPoll() throws InterruptedException { |
480 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
481 |
for (int i = 0; i < SIZE; ++i) { |
482 |
long startTime = System.nanoTime(); |
483 |
assertEquals(i, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
484 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
485 |
} |
486 |
long startTime = System.nanoTime(); |
487 |
assertNull(q.poll(timeoutMillis(), MILLISECONDS)); |
488 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
489 |
checkEmpty(q); |
490 |
} |
491 |
|
492 |
/** |
493 |
* Interrupted timed poll throws InterruptedException instead of |
494 |
* returning timeout status |
495 |
*/ |
496 |
public void testInterruptedTimedPoll() throws InterruptedException { |
497 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
498 |
final CountDownLatch aboutToWait = new CountDownLatch(1); |
499 |
Thread t = newStartedThread(new CheckedRunnable() { |
500 |
public void realRun() throws InterruptedException { |
501 |
long startTime = System.nanoTime(); |
502 |
for (int i = 0; i < SIZE; ++i) { |
503 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
504 |
} |
505 |
aboutToWait.countDown(); |
506 |
try { |
507 |
q.poll(LONG_DELAY_MS, MILLISECONDS); |
508 |
shouldThrow(); |
509 |
} catch (InterruptedException success) { |
510 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
511 |
} |
512 |
}}); |
513 |
|
514 |
await(aboutToWait); |
515 |
waitForThreadToEnterWaitState(t); |
516 |
t.interrupt(); |
517 |
awaitTermination(t); |
518 |
checkEmpty(q); |
519 |
} |
520 |
|
521 |
/** |
522 |
* peek returns next element, or null if empty |
523 |
*/ |
524 |
public void testPeek() { |
525 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
526 |
for (int i = 0; i < SIZE; ++i) { |
527 |
assertEquals(i, q.peek()); |
528 |
assertEquals(i, q.poll()); |
529 |
assertTrue(q.peek() == null || |
530 |
!q.peek().equals(i)); |
531 |
} |
532 |
assertNull(q.peek()); |
533 |
} |
534 |
|
535 |
/** |
536 |
* element returns next element, or throws NSEE if empty |
537 |
*/ |
538 |
public void testElement() { |
539 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
540 |
for (int i = 0; i < SIZE; ++i) { |
541 |
assertEquals(i, q.element()); |
542 |
assertEquals(i, q.poll()); |
543 |
} |
544 |
try { |
545 |
q.element(); |
546 |
shouldThrow(); |
547 |
} catch (NoSuchElementException success) {} |
548 |
} |
549 |
|
550 |
/** |
551 |
* remove removes next element, or throws NSEE if empty |
552 |
*/ |
553 |
public void testRemove() { |
554 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
555 |
for (int i = 0; i < SIZE; ++i) { |
556 |
assertEquals(i, q.remove()); |
557 |
} |
558 |
try { |
559 |
q.remove(); |
560 |
shouldThrow(); |
561 |
} catch (NoSuchElementException success) {} |
562 |
} |
563 |
|
564 |
/** |
565 |
* contains(x) reports true when elements added but not yet removed |
566 |
*/ |
567 |
public void testContains() { |
568 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
569 |
for (int i = 0; i < SIZE; ++i) { |
570 |
assertTrue(q.contains(new Integer(i))); |
571 |
assertEquals(i, q.poll()); |
572 |
assertFalse(q.contains(new Integer(i))); |
573 |
} |
574 |
} |
575 |
|
576 |
/** |
577 |
* clear removes all elements |
578 |
*/ |
579 |
public void testClear() { |
580 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
581 |
q.clear(); |
582 |
assertTrue(q.isEmpty()); |
583 |
assertEquals(0, q.size()); |
584 |
assertEquals(SIZE, q.remainingCapacity()); |
585 |
q.add(one); |
586 |
assertFalse(q.isEmpty()); |
587 |
assertTrue(q.contains(one)); |
588 |
q.clear(); |
589 |
assertTrue(q.isEmpty()); |
590 |
} |
591 |
|
592 |
/** |
593 |
* containsAll(c) is true when c contains a subset of elements |
594 |
*/ |
595 |
public void testContainsAll() { |
596 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
597 |
ArrayBlockingQueue p = new ArrayBlockingQueue(SIZE); |
598 |
for (int i = 0; i < SIZE; ++i) { |
599 |
assertTrue(q.containsAll(p)); |
600 |
assertFalse(p.containsAll(q)); |
601 |
p.add(new Integer(i)); |
602 |
} |
603 |
assertTrue(p.containsAll(q)); |
604 |
} |
605 |
|
606 |
/** |
607 |
* retainAll(c) retains only those elements of c and reports true if changed |
608 |
*/ |
609 |
public void testRetainAll() { |
610 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
611 |
ArrayBlockingQueue p = populatedQueue(SIZE); |
612 |
for (int i = 0; i < SIZE; ++i) { |
613 |
boolean changed = q.retainAll(p); |
614 |
if (i == 0) |
615 |
assertFalse(changed); |
616 |
else |
617 |
assertTrue(changed); |
618 |
|
619 |
assertTrue(q.containsAll(p)); |
620 |
assertEquals(SIZE - i, q.size()); |
621 |
p.remove(); |
622 |
} |
623 |
} |
624 |
|
625 |
/** |
626 |
* removeAll(c) removes only those elements of c and reports true if changed |
627 |
*/ |
628 |
public void testRemoveAll() { |
629 |
for (int i = 1; i < SIZE; ++i) { |
630 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
631 |
ArrayBlockingQueue p = populatedQueue(i); |
632 |
assertTrue(q.removeAll(p)); |
633 |
assertEquals(SIZE - i, q.size()); |
634 |
for (int j = 0; j < i; ++j) { |
635 |
Integer x = (Integer)(p.remove()); |
636 |
assertFalse(q.contains(x)); |
637 |
} |
638 |
} |
639 |
} |
640 |
|
641 |
void checkToArray(ArrayBlockingQueue<Integer> q) { |
642 |
int size = q.size(); |
643 |
Object[] a1 = q.toArray(); |
644 |
assertEquals(size, a1.length); |
645 |
Integer[] a2 = q.toArray(new Integer[0]); |
646 |
assertEquals(size, a2.length); |
647 |
Integer[] a3 = q.toArray(new Integer[Math.max(0, size - 1)]); |
648 |
assertEquals(size, a3.length); |
649 |
Integer[] a4 = new Integer[size]; |
650 |
assertSame(a4, q.toArray(a4)); |
651 |
Integer[] a5 = new Integer[size + 1]; |
652 |
Arrays.fill(a5, 42); |
653 |
assertSame(a5, q.toArray(a5)); |
654 |
Integer[] a6 = new Integer[size + 2]; |
655 |
Arrays.fill(a6, 42); |
656 |
assertSame(a6, q.toArray(a6)); |
657 |
Object[][] as = { a1, a2, a3, a4, a5, a6 }; |
658 |
for (Object[] a : as) { |
659 |
if (a.length > size) assertNull(a[size]); |
660 |
if (a.length > size + 1) assertEquals(42, a[size + 1]); |
661 |
} |
662 |
Iterator it = q.iterator(); |
663 |
Integer s = q.peek(); |
664 |
for (int i = 0; i < size; i++) { |
665 |
Integer x = (Integer) it.next(); |
666 |
assertEquals(s + i, (int) x); |
667 |
for (Object[] a : as) |
668 |
assertSame(a1[i], x); |
669 |
} |
670 |
} |
671 |
|
672 |
/** |
673 |
* toArray() and toArray(a) contain all elements in FIFO order |
674 |
*/ |
675 |
public void testToArray() { |
676 |
final ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
677 |
final int size = rnd.nextInt(6); |
678 |
final int capacity = Math.max(1, size + rnd.nextInt(size + 1)); |
679 |
ArrayBlockingQueue<Integer> q = new ArrayBlockingQueue<>(capacity); |
680 |
for (int i = 0; i < size; i++) { |
681 |
checkToArray(q); |
682 |
q.add(i); |
683 |
} |
684 |
// Provoke wraparound |
685 |
int added = size * 2; |
686 |
for (int i = 0; i < added; i++) { |
687 |
checkToArray(q); |
688 |
assertEquals((Integer) i, q.poll()); |
689 |
q.add(size + i); |
690 |
} |
691 |
for (int i = 0; i < size; i++) { |
692 |
checkToArray(q); |
693 |
assertEquals((Integer) (added + i), q.poll()); |
694 |
} |
695 |
} |
696 |
|
697 |
/** |
698 |
* toArray(incompatible array type) throws ArrayStoreException |
699 |
*/ |
700 |
public void testToArray_incompatibleArrayType() { |
701 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
702 |
try { |
703 |
q.toArray(new String[10]); |
704 |
shouldThrow(); |
705 |
} catch (ArrayStoreException success) {} |
706 |
try { |
707 |
q.toArray(new String[0]); |
708 |
shouldThrow(); |
709 |
} catch (ArrayStoreException success) {} |
710 |
} |
711 |
|
712 |
/** |
713 |
* iterator iterates through all elements |
714 |
*/ |
715 |
public void testIterator() throws InterruptedException { |
716 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
717 |
Iterator it = q.iterator(); |
718 |
int i; |
719 |
for (i = 0; it.hasNext(); i++) |
720 |
assertTrue(q.contains(it.next())); |
721 |
assertEquals(i, SIZE); |
722 |
assertIteratorExhausted(it); |
723 |
|
724 |
it = q.iterator(); |
725 |
for (i = 0; it.hasNext(); i++) |
726 |
assertEquals(it.next(), q.take()); |
727 |
assertEquals(i, SIZE); |
728 |
assertIteratorExhausted(it); |
729 |
} |
730 |
|
731 |
/** |
732 |
* iterator of empty collection has no elements |
733 |
*/ |
734 |
public void testEmptyIterator() { |
735 |
assertIteratorExhausted(new ArrayBlockingQueue(SIZE).iterator()); |
736 |
} |
737 |
|
738 |
/** |
739 |
* iterator.remove removes current element |
740 |
*/ |
741 |
public void testIteratorRemove() { |
742 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(3); |
743 |
q.add(two); |
744 |
q.add(one); |
745 |
q.add(three); |
746 |
|
747 |
Iterator it = q.iterator(); |
748 |
it.next(); |
749 |
it.remove(); |
750 |
|
751 |
it = q.iterator(); |
752 |
assertSame(it.next(), one); |
753 |
assertSame(it.next(), three); |
754 |
assertFalse(it.hasNext()); |
755 |
} |
756 |
|
757 |
/** |
758 |
* iterator ordering is FIFO |
759 |
*/ |
760 |
public void testIteratorOrdering() { |
761 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(3); |
762 |
q.add(one); |
763 |
q.add(two); |
764 |
q.add(three); |
765 |
|
766 |
assertEquals("queue should be full", 0, q.remainingCapacity()); |
767 |
|
768 |
int k = 0; |
769 |
for (Iterator it = q.iterator(); it.hasNext();) { |
770 |
assertEquals(++k, it.next()); |
771 |
} |
772 |
assertEquals(3, k); |
773 |
} |
774 |
|
775 |
/** |
776 |
* Modifications do not cause iterators to fail |
777 |
*/ |
778 |
public void testWeaklyConsistentIteration() { |
779 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(3); |
780 |
q.add(one); |
781 |
q.add(two); |
782 |
q.add(three); |
783 |
for (Iterator it = q.iterator(); it.hasNext();) { |
784 |
q.remove(); |
785 |
it.next(); |
786 |
} |
787 |
assertEquals(0, q.size()); |
788 |
} |
789 |
|
790 |
/** |
791 |
* toString contains toStrings of elements |
792 |
*/ |
793 |
public void testToString() { |
794 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
795 |
String s = q.toString(); |
796 |
for (int i = 0; i < SIZE; ++i) { |
797 |
assertTrue(s.contains(String.valueOf(i))); |
798 |
} |
799 |
} |
800 |
|
801 |
/** |
802 |
* offer transfers elements across Executor tasks |
803 |
*/ |
804 |
public void testOfferInExecutor() { |
805 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
806 |
q.add(one); |
807 |
q.add(two); |
808 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
809 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
810 |
try (PoolCleaner cleaner = cleaner(executor)) { |
811 |
executor.execute(new CheckedRunnable() { |
812 |
public void realRun() throws InterruptedException { |
813 |
assertFalse(q.offer(three)); |
814 |
threadsStarted.await(); |
815 |
assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS)); |
816 |
assertEquals(0, q.remainingCapacity()); |
817 |
}}); |
818 |
|
819 |
executor.execute(new CheckedRunnable() { |
820 |
public void realRun() throws InterruptedException { |
821 |
threadsStarted.await(); |
822 |
assertEquals(0, q.remainingCapacity()); |
823 |
assertSame(one, q.take()); |
824 |
}}); |
825 |
} |
826 |
} |
827 |
|
828 |
/** |
829 |
* timed poll retrieves elements across Executor threads |
830 |
*/ |
831 |
public void testPollInExecutor() { |
832 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
833 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
834 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
835 |
try (PoolCleaner cleaner = cleaner(executor)) { |
836 |
executor.execute(new CheckedRunnable() { |
837 |
public void realRun() throws InterruptedException { |
838 |
assertNull(q.poll()); |
839 |
threadsStarted.await(); |
840 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
841 |
checkEmpty(q); |
842 |
}}); |
843 |
|
844 |
executor.execute(new CheckedRunnable() { |
845 |
public void realRun() throws InterruptedException { |
846 |
threadsStarted.await(); |
847 |
q.put(one); |
848 |
}}); |
849 |
} |
850 |
} |
851 |
|
852 |
/** |
853 |
* A deserialized serialized queue has same elements in same order |
854 |
*/ |
855 |
public void testSerialization() throws Exception { |
856 |
Queue x = populatedQueue(SIZE); |
857 |
Queue y = serialClone(x); |
858 |
|
859 |
assertNotSame(x, y); |
860 |
assertEquals(x.size(), y.size()); |
861 |
assertEquals(x.toString(), y.toString()); |
862 |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
863 |
while (!x.isEmpty()) { |
864 |
assertFalse(y.isEmpty()); |
865 |
assertEquals(x.remove(), y.remove()); |
866 |
} |
867 |
assertTrue(y.isEmpty()); |
868 |
} |
869 |
|
870 |
/** |
871 |
* drainTo(c) empties queue into another collection c |
872 |
*/ |
873 |
public void testDrainTo() { |
874 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
875 |
ArrayList l = new ArrayList(); |
876 |
q.drainTo(l); |
877 |
assertEquals(0, q.size()); |
878 |
assertEquals(SIZE, l.size()); |
879 |
for (int i = 0; i < SIZE; ++i) |
880 |
assertEquals(l.get(i), new Integer(i)); |
881 |
q.add(zero); |
882 |
q.add(one); |
883 |
assertFalse(q.isEmpty()); |
884 |
assertTrue(q.contains(zero)); |
885 |
assertTrue(q.contains(one)); |
886 |
l.clear(); |
887 |
q.drainTo(l); |
888 |
assertEquals(0, q.size()); |
889 |
assertEquals(2, l.size()); |
890 |
for (int i = 0; i < 2; ++i) |
891 |
assertEquals(l.get(i), new Integer(i)); |
892 |
} |
893 |
|
894 |
/** |
895 |
* drainTo empties full queue, unblocking a waiting put. |
896 |
*/ |
897 |
public void testDrainToWithActivePut() throws InterruptedException { |
898 |
final ArrayBlockingQueue q = populatedQueue(SIZE); |
899 |
Thread t = new Thread(new CheckedRunnable() { |
900 |
public void realRun() throws InterruptedException { |
901 |
q.put(new Integer(SIZE + 1)); |
902 |
}}); |
903 |
|
904 |
t.start(); |
905 |
ArrayList l = new ArrayList(); |
906 |
q.drainTo(l); |
907 |
assertTrue(l.size() >= SIZE); |
908 |
for (int i = 0; i < SIZE; ++i) |
909 |
assertEquals(l.get(i), new Integer(i)); |
910 |
t.join(); |
911 |
assertTrue(q.size() + l.size() >= SIZE); |
912 |
} |
913 |
|
914 |
/** |
915 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
916 |
*/ |
917 |
public void testDrainToN() { |
918 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE * 2); |
919 |
for (int i = 0; i < SIZE + 2; ++i) { |
920 |
for (int j = 0; j < SIZE; j++) |
921 |
assertTrue(q.offer(new Integer(j))); |
922 |
ArrayList l = new ArrayList(); |
923 |
q.drainTo(l, i); |
924 |
int k = (i < SIZE) ? i : SIZE; |
925 |
assertEquals(k, l.size()); |
926 |
assertEquals(SIZE - k, q.size()); |
927 |
for (int j = 0; j < k; ++j) |
928 |
assertEquals(l.get(j), new Integer(j)); |
929 |
do {} while (q.poll() != null); |
930 |
} |
931 |
} |
932 |
|
933 |
/** |
934 |
* remove(null), contains(null) always return false |
935 |
*/ |
936 |
public void testNeverContainsNull() { |
937 |
Collection<?>[] qs = { |
938 |
new ArrayBlockingQueue<Object>(10), |
939 |
populatedQueue(2), |
940 |
}; |
941 |
|
942 |
for (Collection<?> q : qs) { |
943 |
assertFalse(q.contains(null)); |
944 |
assertFalse(q.remove(null)); |
945 |
} |
946 |
} |
947 |
} |