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/* |
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* Written by members of JCP JSR-166 Expert Group and released to the |
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* public domain. Use, modify, and redistribute this code in any way |
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* without acknowledgement. Other contributors include Andrew Wright, |
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* Jeffrey Hayes, Pat Fischer, Mike Judd. |
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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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import junit.framework.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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import java.io.*; |
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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.ConcurrentLinkedQueue; |
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|
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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public class ConcurrentLinkedQueueTest extends JSR166TestCase { |
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|
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public static void main(String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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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 new TestSuite(ConcurrentLinkedQueueTest.class); |
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return new TestSuite(ConcurrentLinkedQueueTest.class); |
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} |
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|
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/** |
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* Create a queue of given size containing consecutive |
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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 ConcurrentLinkedQueue populatedQueue(int n) { |
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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
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private ConcurrentLinkedQueue<Integer> populatedQueue(int n) { |
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ConcurrentLinkedQueue<Integer> q = new ConcurrentLinkedQueue<Integer>(); |
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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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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(n, q.size()); |
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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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* |
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* new queue is empty |
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*/ |
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public void testConstructor1() { |
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assertEquals(0, new ConcurrentLinkedQueue().size()); |
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} |
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|
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/** |
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* |
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* Initializing from null Collection throws NPE |
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*/ |
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public void testConstructor3() { |
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try { |
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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue((Collection)null); |
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new ConcurrentLinkedQueue((Collection)null); |
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shouldThrow(); |
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} |
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catch (NullPointerException success) {} |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* |
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* Initializing from Collection of null elements throws NPE |
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*/ |
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public void testConstructor4() { |
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try { |
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Integer[] ints = new Integer[SIZE]; |
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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints)); |
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new ConcurrentLinkedQueue(Arrays.asList(ints)); |
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shouldThrow(); |
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} |
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catch (NullPointerException success) {} |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* |
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* Initializing from Collection with some null elements throws NPE |
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*/ |
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public void testConstructor5() { |
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try { |
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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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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints)); |
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new ConcurrentLinkedQueue(Arrays.asList(ints)); |
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shouldThrow(); |
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} |
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catch (NullPointerException success) {} |
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} catch (NullPointerException success) {} |
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} |
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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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try { |
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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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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(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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finally {} |
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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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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(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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* |
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* isEmpty is true before add, false after |
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*/ |
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public void testEmpty() { |
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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
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} |
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|
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/** |
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* |
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> |
* size changes when elements added and removed |
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*/ |
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public void testSize() { |
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ConcurrentLinkedQueue q = populatedQueue(SIZE); |
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} |
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|
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/** |
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< |
* |
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> |
* offer(null) throws NPE |
127 |
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*/ |
128 |
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public void testOfferNull() { |
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try { |
129 |
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try { |
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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
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q.offer(null); |
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shouldThrow(); |
133 |
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} catch (NullPointerException success) { } |
133 |
> |
} catch (NullPointerException success) {} |
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> |
} |
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|
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/** |
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> |
* add(null) throws NPE |
138 |
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*/ |
139 |
> |
public void testAddNull() { |
140 |
> |
try { |
141 |
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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
142 |
> |
q.add(null); |
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shouldThrow(); |
144 |
> |
} catch (NullPointerException success) {} |
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} |
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|
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/** |
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< |
* |
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> |
* Offer returns true |
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*/ |
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public void testOffer() { |
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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
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} |
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|
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/** |
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* |
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> |
* add returns true |
158 |
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*/ |
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public void testAdd() { |
160 |
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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
165 |
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} |
166 |
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|
167 |
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/** |
168 |
< |
* |
168 |
> |
* addAll(null) throws NPE |
169 |
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*/ |
170 |
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public void testAddAll1() { |
171 |
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try { |
172 |
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ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
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q.addAll(null); |
174 |
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shouldThrow(); |
175 |
< |
} |
165 |
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catch (NullPointerException success) {} |
175 |
> |
} catch (NullPointerException success) {} |
176 |
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} |
177 |
+ |
|
178 |
+ |
/** |
179 |
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* addAll(this) throws IAE |
180 |
+ |
*/ |
181 |
+ |
public void testAddAllSelf() { |
182 |
+ |
try { |
183 |
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ConcurrentLinkedQueue q = populatedQueue(SIZE); |
184 |
+ |
q.addAll(q); |
185 |
+ |
shouldThrow(); |
186 |
+ |
} catch (IllegalArgumentException success) {} |
187 |
+ |
} |
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+ |
|
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/** |
190 |
< |
* |
190 |
> |
* addAll of a collection with null elements throws NPE |
191 |
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*/ |
192 |
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public void testAddAll2() { |
193 |
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try { |
195 |
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Integer[] ints = new Integer[SIZE]; |
196 |
|
q.addAll(Arrays.asList(ints)); |
197 |
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shouldThrow(); |
198 |
< |
} |
177 |
< |
catch (NullPointerException success) {} |
198 |
> |
} catch (NullPointerException success) {} |
199 |
|
} |
200 |
+ |
|
201 |
|
/** |
202 |
< |
* |
202 |
> |
* addAll of a collection with any null elements throws NPE after |
203 |
> |
* possibly adding some elements |
204 |
|
*/ |
205 |
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public void testAddAll3() { |
206 |
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try { |
210 |
|
ints[i] = new Integer(i); |
211 |
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q.addAll(Arrays.asList(ints)); |
212 |
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shouldThrow(); |
213 |
< |
} |
191 |
< |
catch (NullPointerException success) {} |
213 |
> |
} catch (NullPointerException success) {} |
214 |
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} |
215 |
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|
216 |
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/** |
217 |
< |
* |
217 |
> |
* Queue contains all elements, in traversal order, of successful addAll |
218 |
|
*/ |
219 |
|
public void testAddAll5() { |
220 |
< |
try { |
221 |
< |
Integer[] empty = new Integer[0]; |
222 |
< |
Integer[] ints = new Integer[SIZE]; |
223 |
< |
for (int i = 0; i < SIZE; ++i) |
224 |
< |
ints[i] = new Integer(i); |
225 |
< |
ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
226 |
< |
assertFalse(q.addAll(Arrays.asList(empty))); |
227 |
< |
assertTrue(q.addAll(Arrays.asList(ints))); |
228 |
< |
for (int i = 0; i < SIZE; ++i) |
207 |
< |
assertEquals(ints[i], q.poll()); |
208 |
< |
} |
209 |
< |
finally {} |
220 |
> |
Integer[] empty = new Integer[0]; |
221 |
> |
Integer[] ints = new Integer[SIZE]; |
222 |
> |
for (int i = 0; i < SIZE; ++i) |
223 |
> |
ints[i] = new Integer(i); |
224 |
> |
ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
225 |
> |
assertFalse(q.addAll(Arrays.asList(empty))); |
226 |
> |
assertTrue(q.addAll(Arrays.asList(ints))); |
227 |
> |
for (int i = 0; i < SIZE; ++i) |
228 |
> |
assertEquals(ints[i], q.poll()); |
229 |
|
} |
230 |
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|
231 |
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/** |
232 |
< |
* |
232 |
> |
* poll succeeds unless empty |
233 |
|
*/ |
234 |
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public void testPoll() { |
235 |
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ConcurrentLinkedQueue q = populatedQueue(SIZE); |
236 |
|
for (int i = 0; i < SIZE; ++i) { |
237 |
< |
assertEquals(i, ((Integer)q.poll()).intValue()); |
237 |
> |
assertEquals(i, q.poll()); |
238 |
|
} |
239 |
< |
assertNull(q.poll()); |
239 |
> |
assertNull(q.poll()); |
240 |
|
} |
241 |
|
|
242 |
|
/** |
243 |
< |
* |
243 |
> |
* peek returns next element, or null if empty |
244 |
|
*/ |
245 |
|
public void testPeek() { |
246 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
247 |
|
for (int i = 0; i < SIZE; ++i) { |
248 |
< |
assertEquals(i, ((Integer)q.peek()).intValue()); |
249 |
< |
q.poll(); |
248 |
> |
assertEquals(i, q.peek()); |
249 |
> |
assertEquals(i, q.poll()); |
250 |
|
assertTrue(q.peek() == null || |
251 |
< |
i != ((Integer)q.peek()).intValue()); |
251 |
> |
!q.peek().equals(i)); |
252 |
|
} |
253 |
< |
assertNull(q.peek()); |
253 |
> |
assertNull(q.peek()); |
254 |
|
} |
255 |
|
|
256 |
|
/** |
257 |
< |
* |
257 |
> |
* element returns next element, or throws NSEE if empty |
258 |
|
*/ |
259 |
|
public void testElement() { |
260 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
261 |
|
for (int i = 0; i < SIZE; ++i) { |
262 |
< |
assertEquals(i, ((Integer)q.element()).intValue()); |
263 |
< |
q.poll(); |
262 |
> |
assertEquals(i, q.element()); |
263 |
> |
assertEquals(i, q.poll()); |
264 |
|
} |
265 |
|
try { |
266 |
|
q.element(); |
267 |
|
shouldThrow(); |
268 |
< |
} |
250 |
< |
catch (NoSuchElementException success) {} |
268 |
> |
} catch (NoSuchElementException success) {} |
269 |
|
} |
270 |
|
|
271 |
|
/** |
272 |
< |
* |
272 |
> |
* remove removes next element, or throws NSEE if empty |
273 |
|
*/ |
274 |
|
public void testRemove() { |
275 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
276 |
|
for (int i = 0; i < SIZE; ++i) { |
277 |
< |
assertEquals(i, ((Integer)q.remove()).intValue()); |
277 |
> |
assertEquals(i, q.remove()); |
278 |
|
} |
279 |
|
try { |
280 |
|
q.remove(); |
281 |
|
shouldThrow(); |
282 |
< |
} catch (NoSuchElementException success){ |
265 |
< |
} |
282 |
> |
} catch (NoSuchElementException success) {} |
283 |
|
} |
284 |
|
|
285 |
|
/** |
286 |
< |
* |
286 |
> |
* remove(x) removes x and returns true if present |
287 |
|
*/ |
288 |
|
public void testRemoveElement() { |
289 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
290 |
< |
for (int i = 1; i < SIZE; i+=2) { |
291 |
< |
assertTrue(q.remove(new Integer(i))); |
292 |
< |
} |
293 |
< |
for (int i = 0; i < SIZE; i+=2) { |
294 |
< |
assertTrue(q.remove(new Integer(i))); |
295 |
< |
assertFalse(q.remove(new Integer(i+1))); |
290 |
> |
for (int i = 1; i < SIZE; i += 2) { |
291 |
> |
assertTrue(q.contains(i)); |
292 |
> |
assertTrue(q.remove(i)); |
293 |
> |
assertFalse(q.contains(i)); |
294 |
> |
assertTrue(q.contains(i-1)); |
295 |
> |
} |
296 |
> |
for (int i = 0; i < SIZE; i += 2) { |
297 |
> |
assertTrue(q.contains(i)); |
298 |
> |
assertTrue(q.remove(i)); |
299 |
> |
assertFalse(q.contains(i)); |
300 |
> |
assertFalse(q.remove(i+1)); |
301 |
> |
assertFalse(q.contains(i+1)); |
302 |
|
} |
303 |
|
assertTrue(q.isEmpty()); |
304 |
|
} |
305 |
< |
|
305 |
> |
|
306 |
|
/** |
307 |
< |
* |
307 |
> |
* contains(x) reports true when elements added but not yet removed |
308 |
|
*/ |
309 |
|
public void testContains() { |
310 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
316 |
|
} |
317 |
|
|
318 |
|
/** |
319 |
< |
* |
319 |
> |
* clear removes all elements |
320 |
|
*/ |
321 |
|
public void testClear() { |
322 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
330 |
|
} |
331 |
|
|
332 |
|
/** |
333 |
< |
* |
333 |
> |
* containsAll(c) is true when c contains a subset of elements |
334 |
|
*/ |
335 |
|
public void testContainsAll() { |
336 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
344 |
|
} |
345 |
|
|
346 |
|
/** |
347 |
< |
* |
347 |
> |
* retainAll(c) retains only those elements of c and reports true if change |
348 |
|
*/ |
349 |
|
public void testRetainAll() { |
350 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
363 |
|
} |
364 |
|
|
365 |
|
/** |
366 |
< |
* |
366 |
> |
* removeAll(c) removes only those elements of c and reports true if changed |
367 |
|
*/ |
368 |
|
public void testRemoveAll() { |
369 |
|
for (int i = 1; i < SIZE; ++i) { |
372 |
|
assertTrue(q.removeAll(p)); |
373 |
|
assertEquals(SIZE-i, q.size()); |
374 |
|
for (int j = 0; j < i; ++j) { |
375 |
< |
Integer I = (Integer)(p.remove()); |
376 |
< |
assertFalse(q.contains(I)); |
375 |
> |
Integer x = (Integer)(p.remove()); |
376 |
> |
assertFalse(q.contains(x)); |
377 |
|
} |
378 |
|
} |
379 |
|
} |
380 |
|
|
381 |
|
/** |
382 |
< |
* |
382 |
> |
* toArray contains all elements in FIFO order |
383 |
|
*/ |
384 |
|
public void testToArray() { |
385 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
386 |
< |
Object[] o = q.toArray(); |
387 |
< |
Arrays.sort(o); |
388 |
< |
for(int i = 0; i < o.length; i++) |
366 |
< |
assertEquals(o[i], q.poll()); |
386 |
> |
Object[] o = q.toArray(); |
387 |
> |
for (int i = 0; i < o.length; i++) |
388 |
> |
assertSame(o[i], q.poll()); |
389 |
|
} |
390 |
|
|
391 |
|
/** |
392 |
< |
* |
392 |
> |
* toArray(a) contains all elements in FIFO order |
393 |
|
*/ |
394 |
|
public void testToArray2() { |
395 |
+ |
ConcurrentLinkedQueue<Integer> q = populatedQueue(SIZE); |
396 |
+ |
Integer[] ints = new Integer[SIZE]; |
397 |
+ |
Integer[] array = q.toArray(ints); |
398 |
+ |
assertSame(ints, array); |
399 |
+ |
for (int i = 0; i < ints.length; i++) |
400 |
+ |
assertSame(ints[i], q.poll()); |
401 |
+ |
} |
402 |
+ |
|
403 |
+ |
/** |
404 |
+ |
* toArray(null) throws NullPointerException |
405 |
+ |
*/ |
406 |
+ |
public void testToArray_NullArg() { |
407 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
408 |
< |
Integer[] ints = new Integer[SIZE]; |
409 |
< |
ints = (Integer[])q.toArray(ints); |
410 |
< |
Arrays.sort(ints); |
411 |
< |
for(int i = 0; i < ints.length; i++) |
378 |
< |
assertEquals(ints[i], q.poll()); |
408 |
> |
try { |
409 |
> |
q.toArray(null); |
410 |
> |
shouldThrow(); |
411 |
> |
} catch (NullPointerException success) {} |
412 |
|
} |
413 |
< |
|
413 |
> |
|
414 |
> |
/** |
415 |
> |
* toArray(incompatible array type) throws ArrayStoreException |
416 |
> |
*/ |
417 |
> |
public void testToArray1_BadArg() { |
418 |
> |
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
419 |
> |
try { |
420 |
> |
q.toArray(new String[10]); |
421 |
> |
shouldThrow(); |
422 |
> |
} catch (ArrayStoreException success) {} |
423 |
> |
} |
424 |
> |
|
425 |
|
/** |
426 |
< |
* |
426 |
> |
* iterator iterates through all elements |
427 |
|
*/ |
428 |
|
public void testIterator() { |
429 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
430 |
< |
int i = 0; |
431 |
< |
Iterator it = q.iterator(); |
432 |
< |
while(it.hasNext()) { |
430 |
> |
Iterator it = q.iterator(); |
431 |
> |
int i; |
432 |
> |
for (i = 0; it.hasNext(); i++) |
433 |
|
assertTrue(q.contains(it.next())); |
390 |
– |
++i; |
391 |
– |
} |
434 |
|
assertEquals(i, SIZE); |
435 |
+ |
assertIteratorExhausted(it); |
436 |
|
} |
437 |
|
|
438 |
|
/** |
439 |
< |
* |
439 |
> |
* iterator of empty collection has no elements |
440 |
> |
*/ |
441 |
> |
public void testEmptyIterator() { |
442 |
> |
assertIteratorExhausted(new ConcurrentLinkedQueue().iterator()); |
443 |
> |
} |
444 |
> |
|
445 |
> |
/** |
446 |
> |
* iterator ordering is FIFO |
447 |
|
*/ |
448 |
|
public void testIteratorOrdering() { |
449 |
|
final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
453 |
|
|
454 |
|
int k = 0; |
455 |
|
for (Iterator it = q.iterator(); it.hasNext();) { |
456 |
< |
int i = ((Integer)(it.next())).intValue(); |
407 |
< |
assertEquals(++k, i); |
456 |
> |
assertEquals(++k, it.next()); |
457 |
|
} |
458 |
|
|
459 |
|
assertEquals(3, k); |
460 |
|
} |
461 |
|
|
462 |
|
/** |
463 |
< |
* |
463 |
> |
* Modifications do not cause iterators to fail |
464 |
|
*/ |
465 |
< |
public void testWeaklyConsistentIteration () { |
465 |
> |
public void testWeaklyConsistentIteration() { |
466 |
|
final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
467 |
|
q.add(one); |
468 |
|
q.add(two); |
469 |
|
q.add(three); |
470 |
|
|
471 |
< |
try { |
472 |
< |
for (Iterator it = q.iterator(); it.hasNext();) { |
473 |
< |
q.remove(); |
425 |
< |
it.next(); |
426 |
< |
} |
427 |
< |
} |
428 |
< |
catch (ConcurrentModificationException e) { |
429 |
< |
shouldThrow(); |
471 |
> |
for (Iterator it = q.iterator(); it.hasNext();) { |
472 |
> |
q.remove(); |
473 |
> |
it.next(); |
474 |
|
} |
475 |
|
|
476 |
|
assertEquals("queue should be empty again", 0, q.size()); |
477 |
|
} |
478 |
|
|
479 |
|
/** |
480 |
< |
* |
480 |
> |
* iterator.remove removes current element |
481 |
|
*/ |
482 |
< |
public void testIteratorRemove () { |
482 |
> |
public void testIteratorRemove() { |
483 |
|
final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(); |
484 |
|
q.add(one); |
485 |
|
q.add(two); |
488 |
|
it.next(); |
489 |
|
it.remove(); |
490 |
|
it = q.iterator(); |
491 |
< |
assertEquals(it.next(), two); |
492 |
< |
assertEquals(it.next(), three); |
491 |
> |
assertSame(it.next(), two); |
492 |
> |
assertSame(it.next(), three); |
493 |
|
assertFalse(it.hasNext()); |
494 |
|
} |
495 |
|
|
452 |
– |
|
496 |
|
/** |
497 |
< |
* |
497 |
> |
* toString contains toStrings of elements |
498 |
|
*/ |
499 |
|
public void testToString() { |
500 |
|
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
501 |
|
String s = q.toString(); |
502 |
|
for (int i = 0; i < SIZE; ++i) { |
503 |
< |
assertTrue(s.indexOf(String.valueOf(i)) >= 0); |
503 |
> |
assertTrue(s.contains(String.valueOf(i))); |
504 |
|
} |
505 |
< |
} |
505 |
> |
} |
506 |
|
|
507 |
|
/** |
508 |
< |
* |
508 |
> |
* A deserialized serialized queue has same elements in same order |
509 |
|
*/ |
510 |
< |
public void testSerialization() { |
511 |
< |
ConcurrentLinkedQueue q = populatedQueue(SIZE); |
512 |
< |
try { |
470 |
< |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
471 |
< |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
472 |
< |
out.writeObject(q); |
473 |
< |
out.close(); |
510 |
> |
public void testSerialization() throws Exception { |
511 |
> |
Queue x = populatedQueue(SIZE); |
512 |
> |
Queue y = serialClone(x); |
513 |
|
|
514 |
< |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
515 |
< |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
516 |
< |
ConcurrentLinkedQueue r = (ConcurrentLinkedQueue)in.readObject(); |
517 |
< |
assertEquals(q.size(), r.size()); |
518 |
< |
while (!q.isEmpty()) |
519 |
< |
assertEquals(q.remove(), r.remove()); |
520 |
< |
} catch(Exception e){ |
482 |
< |
unexpectedException(); |
514 |
> |
assertNotSame(x, y); |
515 |
> |
assertEquals(x.size(), y.size()); |
516 |
> |
assertEquals(x.toString(), y.toString()); |
517 |
> |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
518 |
> |
while (!x.isEmpty()) { |
519 |
> |
assertFalse(y.isEmpty()); |
520 |
> |
assertEquals(x.remove(), y.remove()); |
521 |
|
} |
522 |
+ |
assertTrue(y.isEmpty()); |
523 |
|
} |
524 |
|
|
525 |
+ |
/** |
526 |
+ |
* remove(null), contains(null) always return false |
527 |
+ |
*/ |
528 |
+ |
public void testNeverContainsNull() { |
529 |
+ |
Collection<?>[] qs = { |
530 |
+ |
new ConcurrentLinkedQueue<Object>(), |
531 |
+ |
populatedQueue(2), |
532 |
+ |
}; |
533 |
+ |
|
534 |
+ |
for (Collection<?> q : qs) { |
535 |
+ |
assertFalse(q.contains(null)); |
536 |
+ |
assertFalse(q.remove(null)); |
537 |
+ |
} |
538 |
+ |
} |
539 |
|
} |