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 |
4 |
* 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 |
|
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import java.util.ArrayList; |
12 |
import java.util.Arrays; |
13 |
import java.util.Collection; |
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import java.util.Iterator; |
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import java.util.NoSuchElementException; |
16 |
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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return newTestSuite(LinkedBlockingQueueTest.class, |
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new Unbounded().testSuite(), |
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new Bounded().testSuite()); |
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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. |
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*/ |
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private LinkedBlockingQueue<Integer> populatedQueue(int n) { |
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LinkedBlockingQueue<Integer> q = |
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new LinkedBlockingQueue<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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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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assertEquals(SIZE, new LinkedBlockingQueue(SIZE).remainingCapacity()); |
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assertEquals(Integer.MAX_VALUE, new LinkedBlockingQueue().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(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(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<Integer> elements = Arrays.asList(new Integer[SIZE]); |
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try { |
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new LinkedBlockingQueue(elements); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
103 |
} |
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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 |
108 |
*/ |
109 |
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] = new Integer(i); |
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Collection<Integer> elements = Arrays.asList(ints); |
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try { |
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new LinkedBlockingQueue(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 |
122 |
*/ |
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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] = new Integer(i); |
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LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints)); |
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for (int i = 0; i < SIZE; ++i) |
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assertEquals(ints[i], q.poll()); |
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} |
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|
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/** |
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* 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 q = new LinkedBlockingQueue(2); |
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assertTrue(q.isEmpty()); |
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assertEquals("should have room for 2", 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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*/ |
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public void testOffer() { |
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LinkedBlockingQueue 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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*/ |
176 |
public void testAdd() { |
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LinkedBlockingQueue q = new LinkedBlockingQueue(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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assertEquals(0, q.remainingCapacity()); |
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try { |
182 |
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 IllegalArgumentException |
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*/ |
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public void testAddAllSelf() { |
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LinkedBlockingQueue 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 q = new LinkedBlockingQueue(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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Collection<Integer> elements = Arrays.asList(ints); |
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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 q = new LinkedBlockingQueue(SIZE - 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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Collection<Integer> elements = Arrays.asList(ints); |
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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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Integer[] empty = new Integer[0]; |
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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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LinkedBlockingQueue q = new LinkedBlockingQueue(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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|
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/** |
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* all elements successfully put are contained |
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*/ |
247 |
public void testPut() throws InterruptedException { |
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LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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Integer x = new Integer(i); |
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q.put(x); |
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assertTrue(q.contains(x)); |
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} |
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assertEquals(0, q.remainingCapacity()); |
255 |
} |
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|
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/** |
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* put blocks interruptibly if full |
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*/ |
260 |
public void testBlockingPut() throws InterruptedException { |
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final LinkedBlockingQueue 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(i); |
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assertEquals(SIZE, q.size()); |
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assertEquals(0, q.remainingCapacity()); |
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|
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Thread.currentThread().interrupt(); |
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try { |
272 |
q.put(99); |
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shouldThrow(); |
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} catch (InterruptedException success) {} |
275 |
assertFalse(Thread.interrupted()); |
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|
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pleaseInterrupt.countDown(); |
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try { |
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q.put(99); |
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shouldThrow(); |
281 |
} catch (InterruptedException success) {} |
282 |
assertFalse(Thread.interrupted()); |
283 |
}}); |
284 |
|
285 |
await(pleaseInterrupt); |
286 |
assertThreadStaysAlive(t); |
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t.interrupt(); |
288 |
awaitTermination(t); |
289 |
assertEquals(SIZE, q.size()); |
290 |
assertEquals(0, q.remainingCapacity()); |
291 |
} |
292 |
|
293 |
/** |
294 |
* put blocks interruptibly waiting for take when full |
295 |
*/ |
296 |
public void testPutWithTake() throws InterruptedException { |
297 |
final int capacity = 2; |
298 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(2); |
299 |
final CountDownLatch pleaseTake = new CountDownLatch(1); |
300 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
301 |
Thread t = newStartedThread(new CheckedRunnable() { |
302 |
public void realRun() throws InterruptedException { |
303 |
for (int i = 0; i < capacity; i++) |
304 |
q.put(i); |
305 |
pleaseTake.countDown(); |
306 |
q.put(86); |
307 |
|
308 |
pleaseInterrupt.countDown(); |
309 |
try { |
310 |
q.put(99); |
311 |
shouldThrow(); |
312 |
} catch (InterruptedException success) {} |
313 |
assertFalse(Thread.interrupted()); |
314 |
}}); |
315 |
|
316 |
await(pleaseTake); |
317 |
assertEquals(0, q.remainingCapacity()); |
318 |
assertEquals(0, q.take()); |
319 |
|
320 |
await(pleaseInterrupt); |
321 |
assertThreadStaysAlive(t); |
322 |
t.interrupt(); |
323 |
awaitTermination(t); |
324 |
assertEquals(0, q.remainingCapacity()); |
325 |
} |
326 |
|
327 |
/** |
328 |
* timed offer times out if full and elements not taken |
329 |
*/ |
330 |
public void testTimedOffer() { |
331 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(2); |
332 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
333 |
Thread t = newStartedThread(new CheckedRunnable() { |
334 |
public void realRun() throws InterruptedException { |
335 |
q.put(new Object()); |
336 |
q.put(new Object()); |
337 |
long startTime = System.nanoTime(); |
338 |
assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS)); |
339 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
340 |
pleaseInterrupt.countDown(); |
341 |
try { |
342 |
q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS); |
343 |
shouldThrow(); |
344 |
} catch (InterruptedException success) {} |
345 |
}}); |
346 |
|
347 |
await(pleaseInterrupt); |
348 |
assertThreadStaysAlive(t); |
349 |
t.interrupt(); |
350 |
awaitTermination(t); |
351 |
} |
352 |
|
353 |
/** |
354 |
* take retrieves elements in FIFO order |
355 |
*/ |
356 |
public void testTake() throws InterruptedException { |
357 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
358 |
for (int i = 0; i < SIZE; ++i) { |
359 |
assertEquals(i, q.take()); |
360 |
} |
361 |
} |
362 |
|
363 |
/** |
364 |
* Take removes existing elements until empty, then blocks interruptibly |
365 |
*/ |
366 |
public void testBlockingTake() throws InterruptedException { |
367 |
final BlockingQueue q = populatedQueue(SIZE); |
368 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
369 |
Thread t = newStartedThread(new CheckedRunnable() { |
370 |
public void realRun() throws InterruptedException { |
371 |
for (int i = 0; i < SIZE; ++i) { |
372 |
assertEquals(i, q.take()); |
373 |
} |
374 |
|
375 |
Thread.currentThread().interrupt(); |
376 |
try { |
377 |
q.take(); |
378 |
shouldThrow(); |
379 |
} catch (InterruptedException success) {} |
380 |
assertFalse(Thread.interrupted()); |
381 |
|
382 |
pleaseInterrupt.countDown(); |
383 |
try { |
384 |
q.take(); |
385 |
shouldThrow(); |
386 |
} catch (InterruptedException success) {} |
387 |
assertFalse(Thread.interrupted()); |
388 |
}}); |
389 |
|
390 |
await(pleaseInterrupt); |
391 |
assertThreadStaysAlive(t); |
392 |
t.interrupt(); |
393 |
awaitTermination(t); |
394 |
} |
395 |
|
396 |
/** |
397 |
* poll succeeds unless empty |
398 |
*/ |
399 |
public void testPoll() { |
400 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
401 |
for (int i = 0; i < SIZE; ++i) { |
402 |
assertEquals(i, q.poll()); |
403 |
} |
404 |
assertNull(q.poll()); |
405 |
} |
406 |
|
407 |
/** |
408 |
* timed poll with zero timeout succeeds when non-empty, else times out |
409 |
*/ |
410 |
public void testTimedPoll0() throws InterruptedException { |
411 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
412 |
for (int i = 0; i < SIZE; ++i) { |
413 |
assertEquals(i, q.poll(0, MILLISECONDS)); |
414 |
} |
415 |
assertNull(q.poll(0, MILLISECONDS)); |
416 |
} |
417 |
|
418 |
/** |
419 |
* timed poll with nonzero timeout succeeds when non-empty, else times out |
420 |
*/ |
421 |
public void testTimedPoll() throws InterruptedException { |
422 |
LinkedBlockingQueue<Integer> q = populatedQueue(SIZE); |
423 |
for (int i = 0; i < SIZE; ++i) { |
424 |
long startTime = System.nanoTime(); |
425 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
426 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
427 |
} |
428 |
long startTime = System.nanoTime(); |
429 |
assertNull(q.poll(timeoutMillis(), MILLISECONDS)); |
430 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
431 |
checkEmpty(q); |
432 |
} |
433 |
|
434 |
/** |
435 |
* Interrupted timed poll throws InterruptedException instead of |
436 |
* returning timeout status |
437 |
*/ |
438 |
public void testInterruptedTimedPoll() throws InterruptedException { |
439 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
440 |
final CountDownLatch aboutToWait = new CountDownLatch(1); |
441 |
Thread t = newStartedThread(new CheckedRunnable() { |
442 |
public void realRun() throws InterruptedException { |
443 |
long startTime = System.nanoTime(); |
444 |
for (int i = 0; i < SIZE; ++i) { |
445 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
446 |
} |
447 |
aboutToWait.countDown(); |
448 |
try { |
449 |
q.poll(LONG_DELAY_MS, MILLISECONDS); |
450 |
shouldThrow(); |
451 |
} catch (InterruptedException success) { |
452 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
453 |
} |
454 |
}}); |
455 |
|
456 |
await(aboutToWait); |
457 |
waitForThreadToEnterWaitState(t); |
458 |
t.interrupt(); |
459 |
awaitTermination(t); |
460 |
checkEmpty(q); |
461 |
} |
462 |
|
463 |
/** |
464 |
* peek returns next element, or null if empty |
465 |
*/ |
466 |
public void testPeek() { |
467 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
468 |
for (int i = 0; i < SIZE; ++i) { |
469 |
assertEquals(i, q.peek()); |
470 |
assertEquals(i, q.poll()); |
471 |
assertTrue(q.peek() == null || |
472 |
!q.peek().equals(i)); |
473 |
} |
474 |
assertNull(q.peek()); |
475 |
} |
476 |
|
477 |
/** |
478 |
* element returns next element, or throws NSEE if empty |
479 |
*/ |
480 |
public void testElement() { |
481 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
482 |
for (int i = 0; i < SIZE; ++i) { |
483 |
assertEquals(i, q.element()); |
484 |
assertEquals(i, q.poll()); |
485 |
} |
486 |
try { |
487 |
q.element(); |
488 |
shouldThrow(); |
489 |
} catch (NoSuchElementException success) {} |
490 |
} |
491 |
|
492 |
/** |
493 |
* remove removes next element, or throws NSEE if empty |
494 |
*/ |
495 |
public void testRemove() { |
496 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
497 |
for (int i = 0; i < SIZE; ++i) { |
498 |
assertEquals(i, q.remove()); |
499 |
} |
500 |
try { |
501 |
q.remove(); |
502 |
shouldThrow(); |
503 |
} catch (NoSuchElementException success) {} |
504 |
} |
505 |
|
506 |
/** |
507 |
* An add following remove(x) succeeds |
508 |
*/ |
509 |
public void testRemoveElementAndAdd() throws InterruptedException { |
510 |
LinkedBlockingQueue q = new LinkedBlockingQueue(); |
511 |
assertTrue(q.add(new Integer(1))); |
512 |
assertTrue(q.add(new Integer(2))); |
513 |
assertTrue(q.remove(new Integer(1))); |
514 |
assertTrue(q.remove(new Integer(2))); |
515 |
assertTrue(q.add(new Integer(3))); |
516 |
assertNotNull(q.take()); |
517 |
} |
518 |
|
519 |
/** |
520 |
* contains(x) reports true when elements added but not yet removed |
521 |
*/ |
522 |
public void testContains() { |
523 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
524 |
for (int i = 0; i < SIZE; ++i) { |
525 |
assertTrue(q.contains(new Integer(i))); |
526 |
q.poll(); |
527 |
assertFalse(q.contains(new Integer(i))); |
528 |
} |
529 |
} |
530 |
|
531 |
/** |
532 |
* clear removes all elements |
533 |
*/ |
534 |
public void testClear() { |
535 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
536 |
q.clear(); |
537 |
assertTrue(q.isEmpty()); |
538 |
assertEquals(0, q.size()); |
539 |
assertEquals(SIZE, q.remainingCapacity()); |
540 |
q.add(one); |
541 |
assertFalse(q.isEmpty()); |
542 |
assertTrue(q.contains(one)); |
543 |
q.clear(); |
544 |
assertTrue(q.isEmpty()); |
545 |
} |
546 |
|
547 |
/** |
548 |
* containsAll(c) is true when c contains a subset of elements |
549 |
*/ |
550 |
public void testContainsAll() { |
551 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
552 |
LinkedBlockingQueue p = new LinkedBlockingQueue(SIZE); |
553 |
for (int i = 0; i < SIZE; ++i) { |
554 |
assertTrue(q.containsAll(p)); |
555 |
assertFalse(p.containsAll(q)); |
556 |
p.add(new Integer(i)); |
557 |
} |
558 |
assertTrue(p.containsAll(q)); |
559 |
} |
560 |
|
561 |
/** |
562 |
* retainAll(c) retains only those elements of c and reports true if changed |
563 |
*/ |
564 |
public void testRetainAll() { |
565 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
566 |
LinkedBlockingQueue p = populatedQueue(SIZE); |
567 |
for (int i = 0; i < SIZE; ++i) { |
568 |
boolean changed = q.retainAll(p); |
569 |
if (i == 0) |
570 |
assertFalse(changed); |
571 |
else |
572 |
assertTrue(changed); |
573 |
|
574 |
assertTrue(q.containsAll(p)); |
575 |
assertEquals(SIZE - i, q.size()); |
576 |
p.remove(); |
577 |
} |
578 |
} |
579 |
|
580 |
/** |
581 |
* removeAll(c) removes only those elements of c and reports true if changed |
582 |
*/ |
583 |
public void testRemoveAll() { |
584 |
for (int i = 1; i < SIZE; ++i) { |
585 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
586 |
LinkedBlockingQueue p = populatedQueue(i); |
587 |
assertTrue(q.removeAll(p)); |
588 |
assertEquals(SIZE - i, q.size()); |
589 |
for (int j = 0; j < i; ++j) { |
590 |
Integer x = (Integer)(p.remove()); |
591 |
assertFalse(q.contains(x)); |
592 |
} |
593 |
} |
594 |
} |
595 |
|
596 |
/** |
597 |
* toArray contains all elements in FIFO order |
598 |
*/ |
599 |
public void testToArray() { |
600 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
601 |
Object[] o = q.toArray(); |
602 |
for (int i = 0; i < o.length; i++) |
603 |
assertSame(o[i], q.poll()); |
604 |
} |
605 |
|
606 |
/** |
607 |
* toArray(a) contains all elements in FIFO order |
608 |
*/ |
609 |
public void testToArray2() throws InterruptedException { |
610 |
LinkedBlockingQueue<Integer> q = populatedQueue(SIZE); |
611 |
Integer[] ints = new Integer[SIZE]; |
612 |
Integer[] array = q.toArray(ints); |
613 |
assertSame(ints, array); |
614 |
for (int i = 0; i < ints.length; i++) |
615 |
assertSame(ints[i], q.poll()); |
616 |
} |
617 |
|
618 |
/** |
619 |
* toArray(incompatible array type) throws ArrayStoreException |
620 |
*/ |
621 |
public void testToArray1_BadArg() { |
622 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
623 |
try { |
624 |
q.toArray(new String[10]); |
625 |
shouldThrow(); |
626 |
} catch (ArrayStoreException success) {} |
627 |
} |
628 |
|
629 |
/** |
630 |
* iterator iterates through all elements |
631 |
*/ |
632 |
public void testIterator() throws InterruptedException { |
633 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
634 |
Iterator it = q.iterator(); |
635 |
int i; |
636 |
for (i = 0; it.hasNext(); i++) |
637 |
assertTrue(q.contains(it.next())); |
638 |
assertEquals(i, SIZE); |
639 |
assertIteratorExhausted(it); |
640 |
|
641 |
it = q.iterator(); |
642 |
for (i = 0; it.hasNext(); i++) |
643 |
assertEquals(it.next(), q.take()); |
644 |
assertEquals(i, SIZE); |
645 |
assertIteratorExhausted(it); |
646 |
} |
647 |
|
648 |
/** |
649 |
* iterator of empty collection has no elements |
650 |
*/ |
651 |
public void testEmptyIterator() { |
652 |
assertIteratorExhausted(new LinkedBlockingQueue().iterator()); |
653 |
} |
654 |
|
655 |
/** |
656 |
* iterator.remove removes current element |
657 |
*/ |
658 |
public void testIteratorRemove() { |
659 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(3); |
660 |
q.add(two); |
661 |
q.add(one); |
662 |
q.add(three); |
663 |
|
664 |
Iterator it = q.iterator(); |
665 |
it.next(); |
666 |
it.remove(); |
667 |
|
668 |
it = q.iterator(); |
669 |
assertSame(it.next(), one); |
670 |
assertSame(it.next(), three); |
671 |
assertFalse(it.hasNext()); |
672 |
} |
673 |
|
674 |
/** |
675 |
* iterator ordering is FIFO |
676 |
*/ |
677 |
public void testIteratorOrdering() { |
678 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(3); |
679 |
q.add(one); |
680 |
q.add(two); |
681 |
q.add(three); |
682 |
assertEquals(0, q.remainingCapacity()); |
683 |
int k = 0; |
684 |
for (Iterator it = q.iterator(); it.hasNext();) { |
685 |
assertEquals(++k, it.next()); |
686 |
} |
687 |
assertEquals(3, k); |
688 |
} |
689 |
|
690 |
/** |
691 |
* Modifications do not cause iterators to fail |
692 |
*/ |
693 |
public void testWeaklyConsistentIteration() { |
694 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(3); |
695 |
q.add(one); |
696 |
q.add(two); |
697 |
q.add(three); |
698 |
for (Iterator it = q.iterator(); it.hasNext();) { |
699 |
q.remove(); |
700 |
it.next(); |
701 |
} |
702 |
assertEquals(0, q.size()); |
703 |
} |
704 |
|
705 |
/** |
706 |
* toString contains toStrings of elements |
707 |
*/ |
708 |
public void testToString() { |
709 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
710 |
String s = q.toString(); |
711 |
for (int i = 0; i < SIZE; ++i) { |
712 |
assertTrue(s.contains(String.valueOf(i))); |
713 |
} |
714 |
} |
715 |
|
716 |
/** |
717 |
* offer transfers elements across Executor tasks |
718 |
*/ |
719 |
public void testOfferInExecutor() { |
720 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(2); |
721 |
q.add(one); |
722 |
q.add(two); |
723 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
724 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
725 |
try (PoolCleaner cleaner = cleaner(executor)) { |
726 |
executor.execute(new CheckedRunnable() { |
727 |
public void realRun() throws InterruptedException { |
728 |
assertFalse(q.offer(three)); |
729 |
threadsStarted.await(); |
730 |
assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS)); |
731 |
assertEquals(0, q.remainingCapacity()); |
732 |
}}); |
733 |
|
734 |
executor.execute(new CheckedRunnable() { |
735 |
public void realRun() throws InterruptedException { |
736 |
threadsStarted.await(); |
737 |
assertSame(one, q.take()); |
738 |
}}); |
739 |
} |
740 |
} |
741 |
|
742 |
/** |
743 |
* timed poll retrieves elements across Executor threads |
744 |
*/ |
745 |
public void testPollInExecutor() { |
746 |
final LinkedBlockingQueue q = new LinkedBlockingQueue(2); |
747 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
748 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
749 |
try (PoolCleaner cleaner = cleaner(executor)) { |
750 |
executor.execute(new CheckedRunnable() { |
751 |
public void realRun() throws InterruptedException { |
752 |
assertNull(q.poll()); |
753 |
threadsStarted.await(); |
754 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
755 |
checkEmpty(q); |
756 |
}}); |
757 |
|
758 |
executor.execute(new CheckedRunnable() { |
759 |
public void realRun() throws InterruptedException { |
760 |
threadsStarted.await(); |
761 |
q.put(one); |
762 |
}}); |
763 |
} |
764 |
} |
765 |
|
766 |
/** |
767 |
* A deserialized serialized queue has same elements in same order |
768 |
*/ |
769 |
public void testSerialization() throws Exception { |
770 |
Queue x = populatedQueue(SIZE); |
771 |
Queue y = serialClone(x); |
772 |
|
773 |
assertNotSame(x, y); |
774 |
assertEquals(x.size(), y.size()); |
775 |
assertEquals(x.toString(), y.toString()); |
776 |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
777 |
while (!x.isEmpty()) { |
778 |
assertFalse(y.isEmpty()); |
779 |
assertEquals(x.remove(), y.remove()); |
780 |
} |
781 |
assertTrue(y.isEmpty()); |
782 |
} |
783 |
|
784 |
/** |
785 |
* drainTo(c) empties queue into another collection c |
786 |
*/ |
787 |
public void testDrainTo() { |
788 |
LinkedBlockingQueue q = populatedQueue(SIZE); |
789 |
ArrayList l = new ArrayList(); |
790 |
q.drainTo(l); |
791 |
assertEquals(0, q.size()); |
792 |
assertEquals(SIZE, l.size()); |
793 |
for (int i = 0; i < SIZE; ++i) |
794 |
assertEquals(l.get(i), new Integer(i)); |
795 |
q.add(zero); |
796 |
q.add(one); |
797 |
assertFalse(q.isEmpty()); |
798 |
assertTrue(q.contains(zero)); |
799 |
assertTrue(q.contains(one)); |
800 |
l.clear(); |
801 |
q.drainTo(l); |
802 |
assertEquals(0, q.size()); |
803 |
assertEquals(2, l.size()); |
804 |
for (int i = 0; i < 2; ++i) |
805 |
assertEquals(l.get(i), new Integer(i)); |
806 |
} |
807 |
|
808 |
/** |
809 |
* drainTo empties full queue, unblocking a waiting put. |
810 |
*/ |
811 |
public void testDrainToWithActivePut() throws InterruptedException { |
812 |
final LinkedBlockingQueue q = populatedQueue(SIZE); |
813 |
Thread t = new Thread(new CheckedRunnable() { |
814 |
public void realRun() throws InterruptedException { |
815 |
q.put(new Integer(SIZE + 1)); |
816 |
}}); |
817 |
|
818 |
t.start(); |
819 |
ArrayList l = new ArrayList(); |
820 |
q.drainTo(l); |
821 |
assertTrue(l.size() >= SIZE); |
822 |
for (int i = 0; i < SIZE; ++i) |
823 |
assertEquals(l.get(i), new Integer(i)); |
824 |
t.join(); |
825 |
assertTrue(q.size() + l.size() >= SIZE); |
826 |
} |
827 |
|
828 |
/** |
829 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
830 |
*/ |
831 |
public void testDrainToN() { |
832 |
LinkedBlockingQueue q = new LinkedBlockingQueue(); |
833 |
for (int i = 0; i < SIZE + 2; ++i) { |
834 |
for (int j = 0; j < SIZE; j++) |
835 |
assertTrue(q.offer(new Integer(j))); |
836 |
ArrayList l = new ArrayList(); |
837 |
q.drainTo(l, i); |
838 |
int k = (i < SIZE) ? i : SIZE; |
839 |
assertEquals(k, l.size()); |
840 |
assertEquals(SIZE - k, q.size()); |
841 |
for (int j = 0; j < k; ++j) |
842 |
assertEquals(l.get(j), new Integer(j)); |
843 |
do {} while (q.poll() != null); |
844 |
} |
845 |
} |
846 |
|
847 |
/** |
848 |
* remove(null), contains(null) always return false |
849 |
*/ |
850 |
public void testNeverContainsNull() { |
851 |
Collection<?>[] qs = { |
852 |
new LinkedBlockingQueue<Object>(), |
853 |
populatedQueue(2), |
854 |
}; |
855 |
|
856 |
for (Collection<?> q : qs) { |
857 |
assertFalse(q.contains(null)); |
858 |
assertFalse(q.remove(null)); |
859 |
} |
860 |
} |
861 |
|
862 |
} |