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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.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.LinkedBlockingQueue; |
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|
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import junit.framework.Test; |
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|
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public class LinkedBlockingQueueTest extends JSR166TestCase { |
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|
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public static class Unbounded extends BlockingQueueTest { |
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protected BlockingQueue emptyCollection() { |
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return new LinkedBlockingQueue(); |
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} |
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} |
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|
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public static class Bounded extends BlockingQueueTest { |
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protected BlockingQueue emptyCollection() { |
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return new LinkedBlockingQueue(SIZE); |
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} |
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} |
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|
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public static void main(String[] args) { |
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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 LinkedBlockingQueue.class; } |
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public Collection emptyCollection() { return new LinkedBlockingQueue(); } |
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public Object makeElement(int i) { return JSR166TestCase.itemFor(i); } |
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public boolean isConcurrent() { return true; } |
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public boolean permitsNulls() { return false; } |
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} |
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return newTestSuite(LinkedBlockingQueueTest.class, |
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new Unbounded().testSuite(), |
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new Bounded().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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* Items 0 ... n - 1. |
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*/ |
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private static LinkedBlockingQueue<Item> populatedQueue(int n) { |
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LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(n); |
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assertTrue(q.isEmpty()); |
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for (int i = 0; i < n; i++) |
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mustOffer(q, i); |
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assertFalse(q.isEmpty()); |
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mustEqual(0, q.remainingCapacity()); |
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mustEqual(n, q.size()); |
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mustEqual(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, or Integer.MAX_VALUE if |
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* none given |
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*/ |
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public void testConstructor1() { |
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mustEqual(SIZE, new LinkedBlockingQueue<Item>(SIZE).remainingCapacity()); |
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mustEqual(Integer.MAX_VALUE, new LinkedBlockingQueue<Item>().remainingCapacity()); |
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} |
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|
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/** |
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* Constructor throws IllegalArgumentException 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 LinkedBlockingQueue<Item>(0); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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} |
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|
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/** |
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* Initializing from null Collection throws NullPointerException |
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*/ |
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public void testConstructor3() { |
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try { |
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new LinkedBlockingQueue<Item>(null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* Initializing from Collection of null elements throws NullPointerException |
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*/ |
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public void testConstructor4() { |
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Collection<Item> elements = Arrays.asList(new Item[SIZE]); |
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try { |
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new LinkedBlockingQueue<Item>(elements); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* Initializing from Collection with some null elements throws |
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* NullPointerException |
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*/ |
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public void testConstructor5() { |
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Item[] items = new Item[2]; |
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items[0] = zero; |
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Collection<Item> elements = Arrays.asList(items); |
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try { |
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new LinkedBlockingQueue<Item>(elements); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* Queue contains all elements of collection used to initialize |
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*/ |
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public void testConstructor6() { |
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Item[] items = defaultItems; |
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LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(Arrays.asList(items)); |
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for (int i = 0; i < SIZE; ++i) |
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mustEqual(items[i], q.poll()); |
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} |
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|
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/** |
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* Queue transitions from empty to full when elements added |
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*/ |
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public void testEmptyFull() { |
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LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2); |
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assertTrue(q.isEmpty()); |
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mustEqual(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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mustEqual(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<Item> q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(i, q.remainingCapacity()); |
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mustEqual(SIZE, q.size() + q.remainingCapacity()); |
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mustEqual(i, q.remove()); |
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} |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(SIZE - i, q.remainingCapacity()); |
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mustEqual(SIZE, q.size() + q.remainingCapacity()); |
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mustAdd(q, i); |
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} |
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} |
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|
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/** |
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* Offer succeeds if not full; fails if full |
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*/ |
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public void testOffer() { |
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LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(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 IllegalStateException if full |
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*/ |
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public void testAdd() { |
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LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE); |
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for (int i = 0; i < SIZE; ++i) |
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mustAdd(q, i); |
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mustEqual(0, q.remainingCapacity()); |
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try { |
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q.add(new Item(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 IllegalArgumentException |
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*/ |
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public void testAddAllSelf() { |
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LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
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try { |
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q.addAll(q); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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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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LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE); |
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Item[] items = new Item[2]; items[0] = zero; |
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Collection<Item> elements = Arrays.asList(items); |
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try { |
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q.addAll(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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* addAll throws IllegalStateException if not enough room |
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*/ |
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public void testAddAll4() { |
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LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE - 1); |
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Item[] items = defaultItems; |
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Collection<Item> elements = Arrays.asList(items); |
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try { |
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q.addAll(elements); |
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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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* Queue contains all elements, in traversal order, of successful addAll |
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*/ |
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public void testAddAll5() { |
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Item[] empty = new Item[0]; |
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Item[] items = defaultItems; |
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LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE); |
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assertFalse(q.addAll(Arrays.asList(empty))); |
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assertTrue(q.addAll(Arrays.asList(items))); |
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for (int i = 0; i < SIZE; ++i) |
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mustEqual(items[i], q.poll()); |
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} |
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|
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/** |
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* all elements successfully put are contained |
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*/ |
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public void testPut() throws InterruptedException { |
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LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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Item x = itemFor(i); |
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q.put(x); |
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mustContain(q, x); |
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} |
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mustEqual(0, q.remainingCapacity()); |
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} |
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|
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/** |
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* put blocks interruptibly if full |
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*/ |
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public void testBlockingPut() throws InterruptedException { |
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final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE); |
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final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
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Thread t = newStartedThread(new CheckedRunnable() { |
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public void realRun() throws InterruptedException { |
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for (int i = 0; i < SIZE; ++i) |
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q.put(itemFor(i)); |
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mustEqual(SIZE, q.size()); |
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mustEqual(0, q.remainingCapacity()); |
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|
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Thread.currentThread().interrupt(); |
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try { |
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q.put(ninetynine); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
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assertFalse(Thread.interrupted()); |
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|
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pleaseInterrupt.countDown(); |
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try { |
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q.put(ninetynine); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
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assertFalse(Thread.interrupted()); |
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}}); |
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|
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await(pleaseInterrupt); |
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if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING); |
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t.interrupt(); |
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awaitTermination(t); |
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mustEqual(SIZE, q.size()); |
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mustEqual(0, q.remainingCapacity()); |
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} |
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|
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/** |
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* put blocks interruptibly waiting for take when full |
294 |
*/ |
295 |
public void testPutWithTake() throws InterruptedException { |
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final int capacity = 2; |
297 |
final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2); |
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final CountDownLatch pleaseTake = new CountDownLatch(1); |
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final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
300 |
Thread t = newStartedThread(new CheckedRunnable() { |
301 |
public void realRun() throws InterruptedException { |
302 |
for (int i = 0; i < capacity; i++) |
303 |
q.put(itemFor(i)); |
304 |
pleaseTake.countDown(); |
305 |
q.put(eightysix); |
306 |
|
307 |
Thread.currentThread().interrupt(); |
308 |
try { |
309 |
q.put(ninetynine); |
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shouldThrow(); |
311 |
} catch (InterruptedException success) {} |
312 |
assertFalse(Thread.interrupted()); |
313 |
|
314 |
pleaseInterrupt.countDown(); |
315 |
try { |
316 |
q.put(ninetynine); |
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shouldThrow(); |
318 |
} catch (InterruptedException success) {} |
319 |
assertFalse(Thread.interrupted()); |
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}}); |
321 |
|
322 |
await(pleaseTake); |
323 |
mustEqual(0, q.remainingCapacity()); |
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mustEqual(0, q.take()); |
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|
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await(pleaseInterrupt); |
327 |
if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING); |
328 |
t.interrupt(); |
329 |
awaitTermination(t); |
330 |
mustEqual(0, q.remainingCapacity()); |
331 |
} |
332 |
|
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/** |
334 |
* timed offer times out if full and elements not taken |
335 |
*/ |
336 |
public void testTimedOffer() { |
337 |
final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2); |
338 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
339 |
Thread t = newStartedThread(new CheckedRunnable() { |
340 |
public void realRun() throws InterruptedException { |
341 |
q.put(zero); |
342 |
q.put(one); |
343 |
long startTime = System.nanoTime(); |
344 |
|
345 |
assertFalse(q.offer(two, timeoutMillis(), MILLISECONDS)); |
346 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
347 |
|
348 |
Thread.currentThread().interrupt(); |
349 |
try { |
350 |
q.offer(three, randomTimeout(), randomTimeUnit()); |
351 |
shouldThrow(); |
352 |
} catch (InterruptedException success) {} |
353 |
assertFalse(Thread.interrupted()); |
354 |
|
355 |
pleaseInterrupt.countDown(); |
356 |
try { |
357 |
q.offer(two, LONGER_DELAY_MS, MILLISECONDS); |
358 |
shouldThrow(); |
359 |
} catch (InterruptedException success) {} |
360 |
assertFalse(Thread.interrupted()); |
361 |
}}); |
362 |
|
363 |
await(pleaseInterrupt); |
364 |
if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING); |
365 |
t.interrupt(); |
366 |
awaitTermination(t); |
367 |
} |
368 |
|
369 |
/** |
370 |
* take retrieves elements in FIFO order |
371 |
*/ |
372 |
public void testTake() throws InterruptedException { |
373 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
374 |
for (int i = 0; i < SIZE; ++i) { |
375 |
mustEqual(i, q.take()); |
376 |
} |
377 |
} |
378 |
|
379 |
/** |
380 |
* Take removes existing elements until empty, then blocks interruptibly |
381 |
*/ |
382 |
public void testBlockingTake() throws InterruptedException { |
383 |
final BlockingQueue<Item> q = populatedQueue(SIZE); |
384 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
385 |
Thread t = newStartedThread(new CheckedRunnable() { |
386 |
public void realRun() throws InterruptedException { |
387 |
for (int i = 0; i < SIZE; i++) mustEqual(i, q.take()); |
388 |
|
389 |
Thread.currentThread().interrupt(); |
390 |
try { |
391 |
q.take(); |
392 |
shouldThrow(); |
393 |
} catch (InterruptedException success) {} |
394 |
assertFalse(Thread.interrupted()); |
395 |
|
396 |
pleaseInterrupt.countDown(); |
397 |
try { |
398 |
q.take(); |
399 |
shouldThrow(); |
400 |
} catch (InterruptedException success) {} |
401 |
assertFalse(Thread.interrupted()); |
402 |
}}); |
403 |
|
404 |
await(pleaseInterrupt); |
405 |
if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING); |
406 |
t.interrupt(); |
407 |
awaitTermination(t); |
408 |
} |
409 |
|
410 |
/** |
411 |
* poll succeeds unless empty |
412 |
*/ |
413 |
public void testPoll() { |
414 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
415 |
for (int i = 0; i < SIZE; ++i) { |
416 |
mustEqual(i, q.poll()); |
417 |
} |
418 |
assertNull(q.poll()); |
419 |
} |
420 |
|
421 |
/** |
422 |
* timed poll with zero timeout succeeds when non-empty, else times out |
423 |
*/ |
424 |
public void testTimedPoll0() throws InterruptedException { |
425 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
426 |
for (int i = 0; i < SIZE; ++i) { |
427 |
mustEqual(i, q.poll(0, MILLISECONDS)); |
428 |
} |
429 |
assertNull(q.poll(0, MILLISECONDS)); |
430 |
} |
431 |
|
432 |
/** |
433 |
* timed poll with nonzero timeout succeeds when non-empty, else times out |
434 |
*/ |
435 |
public void testTimedPoll() throws InterruptedException { |
436 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
437 |
for (int i = 0; i < SIZE; ++i) { |
438 |
long startTime = System.nanoTime(); |
439 |
mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
440 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
441 |
} |
442 |
long startTime = System.nanoTime(); |
443 |
assertNull(q.poll(timeoutMillis(), MILLISECONDS)); |
444 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
445 |
checkEmpty(q); |
446 |
} |
447 |
|
448 |
/** |
449 |
* Interrupted timed poll throws InterruptedException instead of |
450 |
* returning timeout status |
451 |
*/ |
452 |
public void testInterruptedTimedPoll() throws InterruptedException { |
453 |
final BlockingQueue<Item> q = populatedQueue(SIZE); |
454 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
455 |
Thread t = newStartedThread(new CheckedRunnable() { |
456 |
public void realRun() throws InterruptedException { |
457 |
for (int i = 0; i < SIZE; i++) |
458 |
mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
459 |
|
460 |
Thread.currentThread().interrupt(); |
461 |
try { |
462 |
q.poll(randomTimeout(), randomTimeUnit()); |
463 |
shouldThrow(); |
464 |
} catch (InterruptedException success) {} |
465 |
assertFalse(Thread.interrupted()); |
466 |
|
467 |
pleaseInterrupt.countDown(); |
468 |
try { |
469 |
q.poll(LONGER_DELAY_MS, MILLISECONDS); |
470 |
shouldThrow(); |
471 |
} catch (InterruptedException success) {} |
472 |
assertFalse(Thread.interrupted()); |
473 |
}}); |
474 |
|
475 |
await(pleaseInterrupt); |
476 |
if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING); |
477 |
t.interrupt(); |
478 |
awaitTermination(t); |
479 |
checkEmpty(q); |
480 |
} |
481 |
|
482 |
/** |
483 |
* peek returns next element, or null if empty |
484 |
*/ |
485 |
public void testPeek() { |
486 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
487 |
for (int i = 0; i < SIZE; ++i) { |
488 |
mustEqual(i, q.peek()); |
489 |
mustEqual(i, q.poll()); |
490 |
assertTrue(q.peek() == null || |
491 |
!q.peek().equals(i)); |
492 |
} |
493 |
assertNull(q.peek()); |
494 |
} |
495 |
|
496 |
/** |
497 |
* element returns next element, or throws NSEE if empty |
498 |
*/ |
499 |
public void testElement() { |
500 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
501 |
for (int i = 0; i < SIZE; ++i) { |
502 |
mustEqual(i, q.element()); |
503 |
mustEqual(i, q.poll()); |
504 |
} |
505 |
try { |
506 |
q.element(); |
507 |
shouldThrow(); |
508 |
} catch (NoSuchElementException success) {} |
509 |
} |
510 |
|
511 |
/** |
512 |
* remove removes next element, or throws NSEE if empty |
513 |
*/ |
514 |
public void testRemove() { |
515 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
516 |
for (int i = 0; i < SIZE; ++i) { |
517 |
mustEqual(i, q.remove()); |
518 |
} |
519 |
try { |
520 |
q.remove(); |
521 |
shouldThrow(); |
522 |
} catch (NoSuchElementException success) {} |
523 |
} |
524 |
|
525 |
/** |
526 |
* An add following remove(x) succeeds |
527 |
*/ |
528 |
public void testRemoveElementAndAdd() throws InterruptedException { |
529 |
LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(); |
530 |
assertTrue(q.add(one)); |
531 |
assertTrue(q.add(two)); |
532 |
mustRemove(q, one); |
533 |
mustRemove(q, two); |
534 |
mustAdd(q, three); |
535 |
assertNotNull(q.take()); |
536 |
} |
537 |
|
538 |
/** |
539 |
* contains(x) reports true when elements added but not yet removed |
540 |
*/ |
541 |
public void testContains() { |
542 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
543 |
for (int i = 0; i < SIZE; ++i) { |
544 |
mustContain(q, i); |
545 |
q.poll(); |
546 |
mustNotContain(q, i); |
547 |
} |
548 |
} |
549 |
|
550 |
/** |
551 |
* clear removes all elements |
552 |
*/ |
553 |
public void testClear() { |
554 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
555 |
q.clear(); |
556 |
assertTrue(q.isEmpty()); |
557 |
mustEqual(0, q.size()); |
558 |
mustEqual(SIZE, q.remainingCapacity()); |
559 |
q.add(one); |
560 |
assertFalse(q.isEmpty()); |
561 |
assertTrue(q.contains(one)); |
562 |
q.clear(); |
563 |
assertTrue(q.isEmpty()); |
564 |
} |
565 |
|
566 |
/** |
567 |
* containsAll(c) is true when c contains a subset of elements |
568 |
*/ |
569 |
public void testContainsAll() { |
570 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
571 |
LinkedBlockingQueue<Item> p = new LinkedBlockingQueue<>(SIZE); |
572 |
for (int i = 0; i < SIZE; ++i) { |
573 |
assertTrue(q.containsAll(p)); |
574 |
assertFalse(p.containsAll(q)); |
575 |
mustAdd(p, i); |
576 |
} |
577 |
assertTrue(p.containsAll(q)); |
578 |
} |
579 |
|
580 |
/** |
581 |
* retainAll(c) retains only those elements of c and reports true if changed |
582 |
*/ |
583 |
public void testRetainAll() { |
584 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
585 |
LinkedBlockingQueue<Item> p = populatedQueue(SIZE); |
586 |
for (int i = 0; i < SIZE; ++i) { |
587 |
boolean changed = q.retainAll(p); |
588 |
if (i == 0) |
589 |
assertFalse(changed); |
590 |
else |
591 |
assertTrue(changed); |
592 |
|
593 |
assertTrue(q.containsAll(p)); |
594 |
mustEqual(SIZE - i, q.size()); |
595 |
p.remove(); |
596 |
} |
597 |
} |
598 |
|
599 |
/** |
600 |
* removeAll(c) removes only those elements of c and reports true if changed |
601 |
*/ |
602 |
public void testRemoveAll() { |
603 |
for (int i = 1; i < SIZE; ++i) { |
604 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
605 |
LinkedBlockingQueue<Item> p = populatedQueue(i); |
606 |
assertTrue(q.removeAll(p)); |
607 |
mustEqual(SIZE - i, q.size()); |
608 |
for (int j = 0; j < i; ++j) { |
609 |
mustNotContain(q, p.remove()); |
610 |
} |
611 |
} |
612 |
} |
613 |
|
614 |
/** |
615 |
* toArray contains all elements in FIFO order |
616 |
*/ |
617 |
public void testToArray() { |
618 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
619 |
Object[] a = q.toArray(); |
620 |
assertSame(Object[].class, a.getClass()); |
621 |
for (Object o : a) |
622 |
assertSame(o, q.poll()); |
623 |
assertTrue(q.isEmpty()); |
624 |
} |
625 |
|
626 |
/** |
627 |
* toArray(a) contains all elements in FIFO order |
628 |
*/ |
629 |
public void testToArray2() throws InterruptedException { |
630 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
631 |
Item[] items = new Item[SIZE]; |
632 |
Item[] array = q.toArray(items); |
633 |
assertSame(items, array); |
634 |
for (Item o : items) |
635 |
assertSame(o, q.poll()); |
636 |
assertTrue(q.isEmpty()); |
637 |
} |
638 |
|
639 |
/** |
640 |
* toArray(incompatible array type) throws ArrayStoreException |
641 |
*/ |
642 |
@SuppressWarnings("CollectionToArraySafeParameter") |
643 |
public void testToArray_incompatibleArrayType() { |
644 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
645 |
try { |
646 |
q.toArray(new String[10]); |
647 |
shouldThrow(); |
648 |
} catch (ArrayStoreException success) {} |
649 |
} |
650 |
|
651 |
/** |
652 |
* iterator iterates through all elements |
653 |
*/ |
654 |
public void testIterator() throws InterruptedException { |
655 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
656 |
Iterator<? extends Item> it = q.iterator(); |
657 |
int i; |
658 |
for (i = 0; it.hasNext(); i++) |
659 |
mustContain(q, it.next()); |
660 |
mustEqual(i, SIZE); |
661 |
assertIteratorExhausted(it); |
662 |
|
663 |
it = q.iterator(); |
664 |
for (i = 0; it.hasNext(); i++) |
665 |
mustEqual(it.next(), q.take()); |
666 |
mustEqual(i, SIZE); |
667 |
assertIteratorExhausted(it); |
668 |
} |
669 |
|
670 |
/** |
671 |
* iterator of empty collection has no elements |
672 |
*/ |
673 |
public void testEmptyIterator() { |
674 |
assertIteratorExhausted(new LinkedBlockingQueue<Item>().iterator()); |
675 |
} |
676 |
|
677 |
/** |
678 |
* iterator.remove removes current element |
679 |
*/ |
680 |
public void testIteratorRemove() { |
681 |
final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(3); |
682 |
q.add(two); |
683 |
q.add(one); |
684 |
q.add(three); |
685 |
|
686 |
Iterator<? extends Item> it = q.iterator(); |
687 |
it.next(); |
688 |
it.remove(); |
689 |
|
690 |
it = q.iterator(); |
691 |
assertSame(it.next(), one); |
692 |
assertSame(it.next(), three); |
693 |
assertFalse(it.hasNext()); |
694 |
} |
695 |
|
696 |
/** |
697 |
* iterator ordering is FIFO |
698 |
*/ |
699 |
public void testIteratorOrdering() { |
700 |
final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(3); |
701 |
q.add(one); |
702 |
q.add(two); |
703 |
q.add(three); |
704 |
mustEqual(0, q.remainingCapacity()); |
705 |
int k = 0; |
706 |
for (Iterator<? extends Item> it = q.iterator(); it.hasNext();) { |
707 |
mustEqual(++k, it.next()); |
708 |
} |
709 |
mustEqual(3, k); |
710 |
} |
711 |
|
712 |
/** |
713 |
* Modifications do not cause iterators to fail |
714 |
*/ |
715 |
public void testWeaklyConsistentIteration() { |
716 |
final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(3); |
717 |
q.add(one); |
718 |
q.add(two); |
719 |
q.add(three); |
720 |
for (Iterator<? extends Item> it = q.iterator(); it.hasNext();) { |
721 |
q.remove(); |
722 |
it.next(); |
723 |
} |
724 |
mustEqual(0, q.size()); |
725 |
} |
726 |
|
727 |
/** |
728 |
* toString contains toStrings of elements |
729 |
*/ |
730 |
public void testToString() { |
731 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
732 |
String s = q.toString(); |
733 |
for (int i = 0; i < SIZE; ++i) { |
734 |
assertTrue(s.contains(String.valueOf(i))); |
735 |
} |
736 |
} |
737 |
|
738 |
/** |
739 |
* offer transfers elements across Executor tasks |
740 |
*/ |
741 |
public void testOfferInExecutor() { |
742 |
final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2); |
743 |
q.add(one); |
744 |
q.add(two); |
745 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
746 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
747 |
try (PoolCleaner cleaner = cleaner(executor)) { |
748 |
executor.execute(new CheckedRunnable() { |
749 |
public void realRun() throws InterruptedException { |
750 |
assertFalse(q.offer(three)); |
751 |
threadsStarted.await(); |
752 |
assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS)); |
753 |
mustEqual(0, q.remainingCapacity()); |
754 |
}}); |
755 |
|
756 |
executor.execute(new CheckedRunnable() { |
757 |
public void realRun() throws InterruptedException { |
758 |
threadsStarted.await(); |
759 |
assertSame(one, q.take()); |
760 |
}}); |
761 |
} |
762 |
} |
763 |
|
764 |
/** |
765 |
* timed poll retrieves elements across Executor threads |
766 |
*/ |
767 |
public void testPollInExecutor() { |
768 |
final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2); |
769 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
770 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
771 |
try (PoolCleaner cleaner = cleaner(executor)) { |
772 |
executor.execute(new CheckedRunnable() { |
773 |
public void realRun() throws InterruptedException { |
774 |
assertNull(q.poll()); |
775 |
threadsStarted.await(); |
776 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
777 |
checkEmpty(q); |
778 |
}}); |
779 |
|
780 |
executor.execute(new CheckedRunnable() { |
781 |
public void realRun() throws InterruptedException { |
782 |
threadsStarted.await(); |
783 |
q.put(one); |
784 |
}}); |
785 |
} |
786 |
} |
787 |
|
788 |
/** |
789 |
* A deserialized/reserialized queue has same elements in same order |
790 |
*/ |
791 |
public void testSerialization() throws Exception { |
792 |
Queue<Item> x = populatedQueue(SIZE); |
793 |
Queue<Item> y = serialClone(x); |
794 |
|
795 |
assertNotSame(x, y); |
796 |
mustEqual(x.size(), y.size()); |
797 |
mustEqual(x.toString(), y.toString()); |
798 |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
799 |
while (!x.isEmpty()) { |
800 |
assertFalse(y.isEmpty()); |
801 |
mustEqual(x.remove(), y.remove()); |
802 |
} |
803 |
assertTrue(y.isEmpty()); |
804 |
} |
805 |
|
806 |
/** |
807 |
* drainTo(c) empties queue into another collection c |
808 |
*/ |
809 |
public void testDrainTo() { |
810 |
LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
811 |
ArrayList<Item> l = new ArrayList<>(); |
812 |
q.drainTo(l); |
813 |
mustEqual(0, q.size()); |
814 |
mustEqual(SIZE, l.size()); |
815 |
for (int i = 0; i < SIZE; ++i) |
816 |
mustEqual(l.get(i), i); |
817 |
q.add(zero); |
818 |
q.add(one); |
819 |
assertFalse(q.isEmpty()); |
820 |
mustContain(q, zero); |
821 |
mustContain(q, one); |
822 |
l.clear(); |
823 |
q.drainTo(l); |
824 |
mustEqual(0, q.size()); |
825 |
mustEqual(2, l.size()); |
826 |
for (int i = 0; i < 2; ++i) |
827 |
mustEqual(l.get(i), i); |
828 |
} |
829 |
|
830 |
/** |
831 |
* drainTo empties full queue, unblocking a waiting put. |
832 |
*/ |
833 |
public void testDrainToWithActivePut() throws InterruptedException { |
834 |
final LinkedBlockingQueue<Item> q = populatedQueue(SIZE); |
835 |
Thread t = new Thread(new CheckedRunnable() { |
836 |
public void realRun() throws InterruptedException { |
837 |
q.put(new Item(SIZE + 1)); |
838 |
}}); |
839 |
|
840 |
t.start(); |
841 |
ArrayList<Item> l = new ArrayList<>(); |
842 |
q.drainTo(l); |
843 |
assertTrue(l.size() >= SIZE); |
844 |
for (int i = 0; i < SIZE; ++i) |
845 |
mustEqual(l.get(i), i); |
846 |
t.join(); |
847 |
assertTrue(q.size() + l.size() >= SIZE); |
848 |
} |
849 |
|
850 |
/** |
851 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
852 |
*/ |
853 |
public void testDrainToN() { |
854 |
LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(); |
855 |
for (int i = 0; i < SIZE + 2; ++i) { |
856 |
for (int j = 0; j < SIZE; j++) |
857 |
mustOffer(q, j); |
858 |
ArrayList<Item> l = new ArrayList<>(); |
859 |
q.drainTo(l, i); |
860 |
int k = (i < SIZE) ? i : SIZE; |
861 |
mustEqual(k, l.size()); |
862 |
mustEqual(SIZE - k, q.size()); |
863 |
for (int j = 0; j < k; ++j) |
864 |
mustEqual(l.get(j), j); |
865 |
do {} while (q.poll() != null); |
866 |
} |
867 |
} |
868 |
|
869 |
/** |
870 |
* remove(null), contains(null) always return false |
871 |
*/ |
872 |
public void testNeverContainsNull() { |
873 |
Collection<?>[] qs = { |
874 |
new LinkedBlockingQueue<>(), |
875 |
populatedQueue(2), |
876 |
}; |
877 |
|
878 |
for (Collection<?> q : qs) { |
879 |
assertFalse(q.contains(null)); |
880 |
assertFalse(q.remove(null)); |
881 |
} |
882 |
} |
883 |
|
884 |
} |