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, |
6 |
* Pat Fisher, Mike Judd. |
7 |
*/ |
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|
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
10 |
|
11 |
import java.util.ArrayList; |
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import java.util.Arrays; |
13 |
import java.util.Collection; |
14 |
import java.util.Iterator; |
15 |
import java.util.NoSuchElementException; |
16 |
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; |
20 |
import java.util.concurrent.Executors; |
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import java.util.concurrent.ExecutorService; |
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|
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import junit.framework.Test; |
24 |
|
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public class ArrayBlockingQueueTest extends JSR166TestCase { |
26 |
|
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public static class Fair extends BlockingQueueTest { |
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protected BlockingQueue emptyCollection() { |
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return new ArrayBlockingQueue(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 new ArrayBlockingQueue(SIZE, false); |
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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 ArrayBlockingQueue.class; } |
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public Collection emptyCollection() { return new ArrayBlockingQueue(SIZE, false); } |
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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(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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/** |
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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 ArrayBlockingQueue<Integer> populatedQueue(int n) { |
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ArrayBlockingQueue<Integer> q = new ArrayBlockingQueue<Integer>(n); |
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assertTrue(q.isEmpty()); |
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for (int i = 0; i < n; i++) |
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assertTrue(q.offer(new Integer(i))); |
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assertFalse(q.isEmpty()); |
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assertEquals(0, 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 the indicated capacity |
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*/ |
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public void testConstructor1() { |
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assertEquals(SIZE, new ArrayBlockingQueue(SIZE).remainingCapacity()); |
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} |
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|
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/** |
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* Constructor throws IAE if capacity argument nonpositive |
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*/ |
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public void testConstructor2() { |
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try { |
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new ArrayBlockingQueue(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 |
92 |
*/ |
93 |
public void testConstructor3() { |
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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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/** |
101 |
* Initializing from Collection of null elements throws NPE |
102 |
*/ |
103 |
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 |
113 |
*/ |
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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); |
119 |
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 |
127 |
*/ |
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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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Collection<Integer> elements = Arrays.asList(ints); |
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try { |
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new ArrayBlockingQueue(SIZE - 1, false, elements); |
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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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* Queue contains all elements of collection used to initialize |
141 |
*/ |
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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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ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
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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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q.add(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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BlockingQueue q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.remainingCapacity()); |
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assertEquals(SIZE, 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(SIZE - i, q.remainingCapacity()); |
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assertEquals(SIZE, 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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*/ |
187 |
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) { |
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assertTrue(q.add(new Integer(i))); |
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} |
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assertEquals(0, q.remainingCapacity()); |
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try { |
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q.add(new 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); |
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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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*/ |
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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); |
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try { |
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q.addAll(Arrays.asList(ints)); |
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shouldThrow(); |
231 |
} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* addAll throws ISE if not enough room |
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*/ |
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public void testAddAll4() { |
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ArrayBlockingQueue q = new ArrayBlockingQueue(1); |
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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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try { |
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q.addAll(Arrays.asList(ints)); |
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shouldThrow(); |
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} catch (IllegalStateException success) {} |
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} |
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|
248 |
/** |
249 |
* Queue contains all elements, in traversal order, of successful addAll |
250 |
*/ |
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public void testAddAll5() { |
252 |
Integer[] empty = new Integer[0]; |
253 |
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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ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
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assertFalse(q.addAll(Arrays.asList(empty))); |
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assertTrue(q.addAll(Arrays.asList(ints))); |
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for (int i = 0; i < SIZE; ++i) |
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assertEquals(ints[i], q.poll()); |
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} |
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|
263 |
/** |
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* all elements successfully put are contained |
265 |
*/ |
266 |
public void testPut() throws InterruptedException { |
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ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
268 |
for (int i = 0; i < SIZE; ++i) { |
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Integer x = new Integer(i); |
270 |
q.put(x); |
271 |
assertTrue(q.contains(x)); |
272 |
} |
273 |
assertEquals(0, q.remainingCapacity()); |
274 |
} |
275 |
|
276 |
/** |
277 |
* put blocks interruptibly if full |
278 |
*/ |
279 |
public void testBlockingPut() throws InterruptedException { |
280 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
281 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
282 |
Thread t = newStartedThread(new CheckedRunnable() { |
283 |
public void realRun() throws InterruptedException { |
284 |
for (int i = 0; i < SIZE; ++i) |
285 |
q.put(i); |
286 |
assertEquals(SIZE, q.size()); |
287 |
assertEquals(0, q.remainingCapacity()); |
288 |
|
289 |
Thread.currentThread().interrupt(); |
290 |
try { |
291 |
q.put(99); |
292 |
shouldThrow(); |
293 |
} catch (InterruptedException success) {} |
294 |
assertFalse(Thread.interrupted()); |
295 |
|
296 |
pleaseInterrupt.countDown(); |
297 |
try { |
298 |
q.put(99); |
299 |
shouldThrow(); |
300 |
} catch (InterruptedException success) {} |
301 |
assertFalse(Thread.interrupted()); |
302 |
}}); |
303 |
|
304 |
await(pleaseInterrupt); |
305 |
assertThreadStaysAlive(t); |
306 |
t.interrupt(); |
307 |
awaitTermination(t); |
308 |
assertEquals(SIZE, q.size()); |
309 |
assertEquals(0, q.remainingCapacity()); |
310 |
} |
311 |
|
312 |
/** |
313 |
* put blocks interruptibly waiting for take when full |
314 |
*/ |
315 |
public void testPutWithTake() throws InterruptedException { |
316 |
final int capacity = 2; |
317 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(capacity); |
318 |
final CountDownLatch pleaseTake = new CountDownLatch(1); |
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 < capacity; i++) |
323 |
q.put(i); |
324 |
pleaseTake.countDown(); |
325 |
q.put(86); |
326 |
|
327 |
pleaseInterrupt.countDown(); |
328 |
try { |
329 |
q.put(99); |
330 |
shouldThrow(); |
331 |
} catch (InterruptedException success) {} |
332 |
assertFalse(Thread.interrupted()); |
333 |
}}); |
334 |
|
335 |
await(pleaseTake); |
336 |
assertEquals(0, q.remainingCapacity()); |
337 |
assertEquals(0, q.take()); |
338 |
|
339 |
await(pleaseInterrupt); |
340 |
assertThreadStaysAlive(t); |
341 |
t.interrupt(); |
342 |
awaitTermination(t); |
343 |
assertEquals(0, q.remainingCapacity()); |
344 |
} |
345 |
|
346 |
/** |
347 |
* timed offer times out if full and elements not taken |
348 |
*/ |
349 |
public void testTimedOffer() throws InterruptedException { |
350 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
351 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
352 |
Thread t = newStartedThread(new CheckedRunnable() { |
353 |
public void realRun() throws InterruptedException { |
354 |
q.put(new Object()); |
355 |
q.put(new Object()); |
356 |
long startTime = System.nanoTime(); |
357 |
assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS)); |
358 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
359 |
pleaseInterrupt.countDown(); |
360 |
try { |
361 |
q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS); |
362 |
shouldThrow(); |
363 |
} catch (InterruptedException success) {} |
364 |
}}); |
365 |
|
366 |
await(pleaseInterrupt); |
367 |
assertThreadStaysAlive(t); |
368 |
t.interrupt(); |
369 |
awaitTermination(t); |
370 |
} |
371 |
|
372 |
/** |
373 |
* take retrieves elements in FIFO order |
374 |
*/ |
375 |
public void testTake() throws InterruptedException { |
376 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
377 |
for (int i = 0; i < SIZE; ++i) { |
378 |
assertEquals(i, q.take()); |
379 |
} |
380 |
} |
381 |
|
382 |
/** |
383 |
* Take removes existing elements until empty, then blocks interruptibly |
384 |
*/ |
385 |
public void testBlockingTake() throws InterruptedException { |
386 |
final ArrayBlockingQueue q = populatedQueue(SIZE); |
387 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
388 |
Thread t = newStartedThread(new CheckedRunnable() { |
389 |
public void realRun() throws InterruptedException { |
390 |
for (int i = 0; i < SIZE; ++i) { |
391 |
assertEquals(i, q.take()); |
392 |
} |
393 |
|
394 |
Thread.currentThread().interrupt(); |
395 |
try { |
396 |
q.take(); |
397 |
shouldThrow(); |
398 |
} catch (InterruptedException success) {} |
399 |
assertFalse(Thread.interrupted()); |
400 |
|
401 |
pleaseInterrupt.countDown(); |
402 |
try { |
403 |
q.take(); |
404 |
shouldThrow(); |
405 |
} catch (InterruptedException success) {} |
406 |
assertFalse(Thread.interrupted()); |
407 |
}}); |
408 |
|
409 |
await(pleaseInterrupt); |
410 |
assertThreadStaysAlive(t); |
411 |
t.interrupt(); |
412 |
awaitTermination(t); |
413 |
} |
414 |
|
415 |
/** |
416 |
* poll succeeds unless empty |
417 |
*/ |
418 |
public void testPoll() { |
419 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
420 |
for (int i = 0; i < SIZE; ++i) { |
421 |
assertEquals(i, q.poll()); |
422 |
} |
423 |
assertNull(q.poll()); |
424 |
} |
425 |
|
426 |
/** |
427 |
* timed poll with zero timeout succeeds when non-empty, else times out |
428 |
*/ |
429 |
public void testTimedPoll0() throws InterruptedException { |
430 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
431 |
for (int i = 0; i < SIZE; ++i) { |
432 |
assertEquals(i, q.poll(0, MILLISECONDS)); |
433 |
} |
434 |
assertNull(q.poll(0, MILLISECONDS)); |
435 |
checkEmpty(q); |
436 |
} |
437 |
|
438 |
/** |
439 |
* timed poll with nonzero timeout succeeds when non-empty, else times out |
440 |
*/ |
441 |
public void testTimedPoll() throws InterruptedException { |
442 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
443 |
for (int i = 0; i < SIZE; ++i) { |
444 |
long startTime = System.nanoTime(); |
445 |
assertEquals(i, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
446 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
447 |
} |
448 |
long startTime = System.nanoTime(); |
449 |
assertNull(q.poll(timeoutMillis(), MILLISECONDS)); |
450 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
451 |
checkEmpty(q); |
452 |
} |
453 |
|
454 |
/** |
455 |
* Interrupted timed poll throws InterruptedException instead of |
456 |
* returning timeout status |
457 |
*/ |
458 |
public void testInterruptedTimedPoll() throws InterruptedException { |
459 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
460 |
final CountDownLatch aboutToWait = new CountDownLatch(1); |
461 |
Thread t = newStartedThread(new CheckedRunnable() { |
462 |
public void realRun() throws InterruptedException { |
463 |
long startTime = System.nanoTime(); |
464 |
for (int i = 0; i < SIZE; ++i) { |
465 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
466 |
} |
467 |
aboutToWait.countDown(); |
468 |
try { |
469 |
q.poll(LONG_DELAY_MS, MILLISECONDS); |
470 |
shouldThrow(); |
471 |
} catch (InterruptedException success) { |
472 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
473 |
} |
474 |
}}); |
475 |
|
476 |
await(aboutToWait); |
477 |
waitForThreadToEnterWaitState(t); |
478 |
t.interrupt(); |
479 |
awaitTermination(t); |
480 |
checkEmpty(q); |
481 |
} |
482 |
|
483 |
/** |
484 |
* peek returns next element, or null if empty |
485 |
*/ |
486 |
public void testPeek() { |
487 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
488 |
for (int i = 0; i < SIZE; ++i) { |
489 |
assertEquals(i, q.peek()); |
490 |
assertEquals(i, q.poll()); |
491 |
assertTrue(q.peek() == null || |
492 |
!q.peek().equals(i)); |
493 |
} |
494 |
assertNull(q.peek()); |
495 |
} |
496 |
|
497 |
/** |
498 |
* element returns next element, or throws NSEE if empty |
499 |
*/ |
500 |
public void testElement() { |
501 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
502 |
for (int i = 0; i < SIZE; ++i) { |
503 |
assertEquals(i, q.element()); |
504 |
assertEquals(i, q.poll()); |
505 |
} |
506 |
try { |
507 |
q.element(); |
508 |
shouldThrow(); |
509 |
} catch (NoSuchElementException success) {} |
510 |
} |
511 |
|
512 |
/** |
513 |
* remove removes next element, or throws NSEE if empty |
514 |
*/ |
515 |
public void testRemove() { |
516 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
517 |
for (int i = 0; i < SIZE; ++i) { |
518 |
assertEquals(i, q.remove()); |
519 |
} |
520 |
try { |
521 |
q.remove(); |
522 |
shouldThrow(); |
523 |
} catch (NoSuchElementException success) {} |
524 |
} |
525 |
|
526 |
/** |
527 |
* contains(x) reports true when elements added but not yet removed |
528 |
*/ |
529 |
public void testContains() { |
530 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
531 |
for (int i = 0; i < SIZE; ++i) { |
532 |
assertTrue(q.contains(new Integer(i))); |
533 |
assertEquals(i, q.poll()); |
534 |
assertFalse(q.contains(new Integer(i))); |
535 |
} |
536 |
} |
537 |
|
538 |
/** |
539 |
* clear removes all elements |
540 |
*/ |
541 |
public void testClear() { |
542 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
543 |
q.clear(); |
544 |
assertTrue(q.isEmpty()); |
545 |
assertEquals(0, q.size()); |
546 |
assertEquals(SIZE, q.remainingCapacity()); |
547 |
q.add(one); |
548 |
assertFalse(q.isEmpty()); |
549 |
assertTrue(q.contains(one)); |
550 |
q.clear(); |
551 |
assertTrue(q.isEmpty()); |
552 |
} |
553 |
|
554 |
/** |
555 |
* containsAll(c) is true when c contains a subset of elements |
556 |
*/ |
557 |
public void testContainsAll() { |
558 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
559 |
ArrayBlockingQueue p = new ArrayBlockingQueue(SIZE); |
560 |
for (int i = 0; i < SIZE; ++i) { |
561 |
assertTrue(q.containsAll(p)); |
562 |
assertFalse(p.containsAll(q)); |
563 |
p.add(new Integer(i)); |
564 |
} |
565 |
assertTrue(p.containsAll(q)); |
566 |
} |
567 |
|
568 |
/** |
569 |
* retainAll(c) retains only those elements of c and reports true if changed |
570 |
*/ |
571 |
public void testRetainAll() { |
572 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
573 |
ArrayBlockingQueue p = populatedQueue(SIZE); |
574 |
for (int i = 0; i < SIZE; ++i) { |
575 |
boolean changed = q.retainAll(p); |
576 |
if (i == 0) |
577 |
assertFalse(changed); |
578 |
else |
579 |
assertTrue(changed); |
580 |
|
581 |
assertTrue(q.containsAll(p)); |
582 |
assertEquals(SIZE - i, q.size()); |
583 |
p.remove(); |
584 |
} |
585 |
} |
586 |
|
587 |
/** |
588 |
* removeAll(c) removes only those elements of c and reports true if changed |
589 |
*/ |
590 |
public void testRemoveAll() { |
591 |
for (int i = 1; i < SIZE; ++i) { |
592 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
593 |
ArrayBlockingQueue p = populatedQueue(i); |
594 |
assertTrue(q.removeAll(p)); |
595 |
assertEquals(SIZE - i, q.size()); |
596 |
for (int j = 0; j < i; ++j) { |
597 |
Integer x = (Integer)(p.remove()); |
598 |
assertFalse(q.contains(x)); |
599 |
} |
600 |
} |
601 |
} |
602 |
|
603 |
void checkToArray(ArrayBlockingQueue q) { |
604 |
int size = q.size(); |
605 |
Object[] o = q.toArray(); |
606 |
assertEquals(size, o.length); |
607 |
Iterator it = q.iterator(); |
608 |
for (int i = 0; i < size; i++) { |
609 |
Integer x = (Integer) it.next(); |
610 |
assertEquals((Integer)o[0] + i, (int) x); |
611 |
assertSame(o[i], x); |
612 |
} |
613 |
} |
614 |
|
615 |
/** |
616 |
* toArray() contains all elements in FIFO order |
617 |
*/ |
618 |
public void testToArray() { |
619 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
620 |
for (int i = 0; i < SIZE; i++) { |
621 |
checkToArray(q); |
622 |
q.add(i); |
623 |
} |
624 |
// Provoke wraparound |
625 |
for (int i = 0; i < SIZE; i++) { |
626 |
checkToArray(q); |
627 |
assertEquals(i, q.poll()); |
628 |
checkToArray(q); |
629 |
q.add(SIZE + i); |
630 |
} |
631 |
for (int i = 0; i < SIZE; i++) { |
632 |
checkToArray(q); |
633 |
assertEquals(SIZE + i, q.poll()); |
634 |
} |
635 |
} |
636 |
|
637 |
void checkToArray2(ArrayBlockingQueue q) { |
638 |
int size = q.size(); |
639 |
Integer[] a1 = (size == 0) ? null : new Integer[size - 1]; |
640 |
Integer[] a2 = new Integer[size]; |
641 |
Integer[] a3 = new Integer[size + 2]; |
642 |
if (size > 0) Arrays.fill(a1, 42); |
643 |
Arrays.fill(a2, 42); |
644 |
Arrays.fill(a3, 42); |
645 |
Integer[] b1 = (size == 0) ? null : (Integer[]) q.toArray(a1); |
646 |
Integer[] b2 = (Integer[]) q.toArray(a2); |
647 |
Integer[] b3 = (Integer[]) q.toArray(a3); |
648 |
assertSame(a2, b2); |
649 |
assertSame(a3, b3); |
650 |
Iterator it = q.iterator(); |
651 |
for (int i = 0; i < size; i++) { |
652 |
Integer x = (Integer) it.next(); |
653 |
assertSame(b1[i], x); |
654 |
assertEquals(b1[0] + i, (int) x); |
655 |
assertSame(b2[i], x); |
656 |
assertSame(b3[i], x); |
657 |
} |
658 |
assertNull(a3[size]); |
659 |
assertEquals(42, (int) a3[size + 1]); |
660 |
if (size > 0) { |
661 |
assertNotSame(a1, b1); |
662 |
assertEquals(size, b1.length); |
663 |
for (int i = 0; i < a1.length; i++) { |
664 |
assertEquals(42, (int) a1[i]); |
665 |
} |
666 |
} |
667 |
} |
668 |
|
669 |
/** |
670 |
* toArray(a) contains all elements in FIFO order |
671 |
*/ |
672 |
public void testToArray2() { |
673 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE); |
674 |
for (int i = 0; i < SIZE; i++) { |
675 |
checkToArray2(q); |
676 |
q.add(i); |
677 |
} |
678 |
// Provoke wraparound |
679 |
for (int i = 0; i < SIZE; i++) { |
680 |
checkToArray2(q); |
681 |
assertEquals(i, q.poll()); |
682 |
checkToArray2(q); |
683 |
q.add(SIZE + i); |
684 |
} |
685 |
for (int i = 0; i < SIZE; i++) { |
686 |
checkToArray2(q); |
687 |
assertEquals(SIZE + i, q.poll()); |
688 |
} |
689 |
} |
690 |
|
691 |
/** |
692 |
* toArray(incompatible array type) throws ArrayStoreException |
693 |
*/ |
694 |
public void testToArray1_BadArg() { |
695 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
696 |
try { |
697 |
q.toArray(new String[10]); |
698 |
shouldThrow(); |
699 |
} catch (ArrayStoreException success) {} |
700 |
} |
701 |
|
702 |
/** |
703 |
* iterator iterates through all elements |
704 |
*/ |
705 |
public void testIterator() throws InterruptedException { |
706 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
707 |
Iterator it = q.iterator(); |
708 |
int i; |
709 |
for (i = 0; it.hasNext(); i++) |
710 |
assertTrue(q.contains(it.next())); |
711 |
assertEquals(i, SIZE); |
712 |
assertIteratorExhausted(it); |
713 |
|
714 |
it = q.iterator(); |
715 |
for (i = 0; it.hasNext(); i++) |
716 |
assertEquals(it.next(), q.take()); |
717 |
assertEquals(i, SIZE); |
718 |
assertIteratorExhausted(it); |
719 |
} |
720 |
|
721 |
/** |
722 |
* iterator of empty collection has no elements |
723 |
*/ |
724 |
public void testEmptyIterator() { |
725 |
assertIteratorExhausted(new ArrayBlockingQueue(SIZE).iterator()); |
726 |
} |
727 |
|
728 |
/** |
729 |
* iterator.remove removes current element |
730 |
*/ |
731 |
public void testIteratorRemove() { |
732 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(3); |
733 |
q.add(two); |
734 |
q.add(one); |
735 |
q.add(three); |
736 |
|
737 |
Iterator it = q.iterator(); |
738 |
it.next(); |
739 |
it.remove(); |
740 |
|
741 |
it = q.iterator(); |
742 |
assertSame(it.next(), one); |
743 |
assertSame(it.next(), three); |
744 |
assertFalse(it.hasNext()); |
745 |
} |
746 |
|
747 |
/** |
748 |
* iterator ordering is FIFO |
749 |
*/ |
750 |
public void testIteratorOrdering() { |
751 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(3); |
752 |
q.add(one); |
753 |
q.add(two); |
754 |
q.add(three); |
755 |
|
756 |
assertEquals("queue should be full", 0, q.remainingCapacity()); |
757 |
|
758 |
int k = 0; |
759 |
for (Iterator it = q.iterator(); it.hasNext();) { |
760 |
assertEquals(++k, it.next()); |
761 |
} |
762 |
assertEquals(3, k); |
763 |
} |
764 |
|
765 |
/** |
766 |
* Modifications do not cause iterators to fail |
767 |
*/ |
768 |
public void testWeaklyConsistentIteration() { |
769 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(3); |
770 |
q.add(one); |
771 |
q.add(two); |
772 |
q.add(three); |
773 |
for (Iterator it = q.iterator(); it.hasNext();) { |
774 |
q.remove(); |
775 |
it.next(); |
776 |
} |
777 |
assertEquals(0, q.size()); |
778 |
} |
779 |
|
780 |
/** |
781 |
* toString contains toStrings of elements |
782 |
*/ |
783 |
public void testToString() { |
784 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
785 |
String s = q.toString(); |
786 |
for (int i = 0; i < SIZE; ++i) { |
787 |
assertTrue(s.contains(String.valueOf(i))); |
788 |
} |
789 |
} |
790 |
|
791 |
/** |
792 |
* offer transfers elements across Executor tasks |
793 |
*/ |
794 |
public void testOfferInExecutor() { |
795 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
796 |
q.add(one); |
797 |
q.add(two); |
798 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
799 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
800 |
try (PoolCleaner cleaner = cleaner(executor)) { |
801 |
executor.execute(new CheckedRunnable() { |
802 |
public void realRun() throws InterruptedException { |
803 |
assertFalse(q.offer(three)); |
804 |
threadsStarted.await(); |
805 |
assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS)); |
806 |
assertEquals(0, q.remainingCapacity()); |
807 |
}}); |
808 |
|
809 |
executor.execute(new CheckedRunnable() { |
810 |
public void realRun() throws InterruptedException { |
811 |
threadsStarted.await(); |
812 |
assertEquals(0, q.remainingCapacity()); |
813 |
assertSame(one, q.take()); |
814 |
}}); |
815 |
} |
816 |
} |
817 |
|
818 |
/** |
819 |
* timed poll retrieves elements across Executor threads |
820 |
*/ |
821 |
public void testPollInExecutor() { |
822 |
final ArrayBlockingQueue q = new ArrayBlockingQueue(2); |
823 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
824 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
825 |
try (PoolCleaner cleaner = cleaner(executor)) { |
826 |
executor.execute(new CheckedRunnable() { |
827 |
public void realRun() throws InterruptedException { |
828 |
assertNull(q.poll()); |
829 |
threadsStarted.await(); |
830 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
831 |
checkEmpty(q); |
832 |
}}); |
833 |
|
834 |
executor.execute(new CheckedRunnable() { |
835 |
public void realRun() throws InterruptedException { |
836 |
threadsStarted.await(); |
837 |
q.put(one); |
838 |
}}); |
839 |
} |
840 |
} |
841 |
|
842 |
/** |
843 |
* A deserialized serialized queue has same elements in same order |
844 |
*/ |
845 |
public void testSerialization() throws Exception { |
846 |
Queue x = populatedQueue(SIZE); |
847 |
Queue y = serialClone(x); |
848 |
|
849 |
assertNotSame(x, y); |
850 |
assertEquals(x.size(), y.size()); |
851 |
assertEquals(x.toString(), y.toString()); |
852 |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
853 |
while (!x.isEmpty()) { |
854 |
assertFalse(y.isEmpty()); |
855 |
assertEquals(x.remove(), y.remove()); |
856 |
} |
857 |
assertTrue(y.isEmpty()); |
858 |
} |
859 |
|
860 |
/** |
861 |
* drainTo(c) empties queue into another collection c |
862 |
*/ |
863 |
public void testDrainTo() { |
864 |
ArrayBlockingQueue q = populatedQueue(SIZE); |
865 |
ArrayList l = new ArrayList(); |
866 |
q.drainTo(l); |
867 |
assertEquals(0, q.size()); |
868 |
assertEquals(SIZE, l.size()); |
869 |
for (int i = 0; i < SIZE; ++i) |
870 |
assertEquals(l.get(i), new Integer(i)); |
871 |
q.add(zero); |
872 |
q.add(one); |
873 |
assertFalse(q.isEmpty()); |
874 |
assertTrue(q.contains(zero)); |
875 |
assertTrue(q.contains(one)); |
876 |
l.clear(); |
877 |
q.drainTo(l); |
878 |
assertEquals(0, q.size()); |
879 |
assertEquals(2, l.size()); |
880 |
for (int i = 0; i < 2; ++i) |
881 |
assertEquals(l.get(i), new Integer(i)); |
882 |
} |
883 |
|
884 |
/** |
885 |
* drainTo empties full queue, unblocking a waiting put. |
886 |
*/ |
887 |
public void testDrainToWithActivePut() throws InterruptedException { |
888 |
final ArrayBlockingQueue q = populatedQueue(SIZE); |
889 |
Thread t = new Thread(new CheckedRunnable() { |
890 |
public void realRun() throws InterruptedException { |
891 |
q.put(new Integer(SIZE + 1)); |
892 |
}}); |
893 |
|
894 |
t.start(); |
895 |
ArrayList l = new ArrayList(); |
896 |
q.drainTo(l); |
897 |
assertTrue(l.size() >= SIZE); |
898 |
for (int i = 0; i < SIZE; ++i) |
899 |
assertEquals(l.get(i), new Integer(i)); |
900 |
t.join(); |
901 |
assertTrue(q.size() + l.size() >= SIZE); |
902 |
} |
903 |
|
904 |
/** |
905 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
906 |
*/ |
907 |
public void testDrainToN() { |
908 |
ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE * 2); |
909 |
for (int i = 0; i < SIZE + 2; ++i) { |
910 |
for (int j = 0; j < SIZE; j++) |
911 |
assertTrue(q.offer(new Integer(j))); |
912 |
ArrayList l = new ArrayList(); |
913 |
q.drainTo(l, i); |
914 |
int k = (i < SIZE) ? i : SIZE; |
915 |
assertEquals(k, l.size()); |
916 |
assertEquals(SIZE - k, q.size()); |
917 |
for (int j = 0; j < k; ++j) |
918 |
assertEquals(l.get(j), new Integer(j)); |
919 |
do {} while (q.poll() != null); |
920 |
} |
921 |
} |
922 |
|
923 |
/** |
924 |
* remove(null), contains(null) always return false |
925 |
*/ |
926 |
public void testNeverContainsNull() { |
927 |
Collection<?>[] qs = { |
928 |
new ArrayBlockingQueue<Object>(10), |
929 |
populatedQueue(2), |
930 |
}; |
931 |
|
932 |
for (Collection<?> q : qs) { |
933 |
assertFalse(q.contains(null)); |
934 |
assertFalse(q.remove(null)); |
935 |
} |
936 |
} |
937 |
} |