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root/jsr166/jsr166/src/test/tck/LinkedBlockingQueueTest.java

Comparing jsr166/src/test/tck/LinkedBlockingQueueTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:08 2003 UTC vs.
Revision 1.78 by jsr166, Mon May 28 21:19:50 2018 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
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/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
10	<	import java.util.*;
11	<	import java.util.concurrent.*;
12	<	import java.io.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	>
11	>	import java.util.ArrayList;
12	>	import java.util.Arrays;
13	>	import java.util.Collection;
14	>	import java.util.Iterator;
15	>	import java.util.NoSuchElementException;
16	>	import java.util.Queue;
17	>	import java.util.concurrent.BlockingQueue;
18	>	import java.util.concurrent.CountDownLatch;
19	>	import java.util.concurrent.Executors;
20	>	import java.util.concurrent.ExecutorService;
21	>	import java.util.concurrent.LinkedBlockingQueue;
22	>
23	>	import junit.framework.Test;
24
25		public class LinkedBlockingQueueTest extends JSR166TestCase {
26
27	+	public static class Unbounded extends BlockingQueueTest {
28	+	protected BlockingQueue emptyCollection() {
29	+	return new LinkedBlockingQueue();
30	+	}
31	+	}
32	+
33	+	public static class Bounded extends BlockingQueueTest {
34	+	protected BlockingQueue emptyCollection() {
35	+	return new LinkedBlockingQueue(SIZE);
36	+	}
37	+	}
38	+
39		public static void main(String[] args) {
40	<	junit.textui.TestRunner.run (suite());
40	>	main(suite(), args);
41		}
42
43		public static Test suite() {
44	<	return new TestSuite(LinkedBlockingQueueTest.class);
44	>	class Implementation implements CollectionImplementation {
45	>	public Class<?> klazz() { return LinkedBlockingQueue.class; }
46	>	public Collection emptyCollection() { return new LinkedBlockingQueue(); }
47	>	public Object makeElement(int i) { return i; }
48	>	public boolean isConcurrent() { return true; }
49	>	public boolean permitsNulls() { return false; }
50	>	}
51	>	return newTestSuite(LinkedBlockingQueueTest.class,
52	>	new Unbounded().testSuite(),
53	>	new Bounded().testSuite(),
54	>	CollectionTest.testSuite(new Implementation()));
55		}
56
23	–
57		/**
58	<	* Create a queue of given size containing consecutive
59	<	* Integers 0 ... n.
58	>	* Returns a new queue of given size containing consecutive
59	>	* Integers 0 ... n - 1.
60		*/
61	<	private LinkedBlockingQueue populatedQueue(int n) {
62	<	LinkedBlockingQueue q = new LinkedBlockingQueue(n);
61	>	private static LinkedBlockingQueue<Integer> populatedQueue(int n) {
62	>	LinkedBlockingQueue<Integer> q = new LinkedBlockingQueue<>(n);
63		assertTrue(q.isEmpty());
64	<	for(int i = 0; i < n; i++)
65	<	assertTrue(q.offer(new Integer(i)));
64	>	for (int i = 0; i < n; i++)
65	>	assertTrue(q.offer(new Integer(i)));
66		assertFalse(q.isEmpty());
67		assertEquals(0, q.remainingCapacity());
68	<	assertEquals(n, q.size());
68	>	assertEquals(n, q.size());
69	>	assertEquals((Integer) 0, q.peek());
70		return q;
71		}
72	<
72	>
73		/**
74	<	*
74	>	* A new queue has the indicated capacity, or Integer.MAX_VALUE if
75	>	* none given
76		*/
77		public void testConstructor1() {
78		assertEquals(SIZE, new LinkedBlockingQueue(SIZE).remainingCapacity());
79	+	assertEquals(Integer.MAX_VALUE, new LinkedBlockingQueue().remainingCapacity());
80		}
81
82		/**
83	<	*
83	>	* Constructor throws IllegalArgumentException if capacity argument nonpositive
84		*/
85		public void testConstructor2() {
86		try {
87	<	LinkedBlockingQueue q = new LinkedBlockingQueue(0);
87	>	new LinkedBlockingQueue(0);
88		shouldThrow();
89	<	}
54	<	catch (IllegalArgumentException success) {}
89	>	} catch (IllegalArgumentException success) {}
90		}
91
92		/**
93	<	*
93	>	* Initializing from null Collection throws NullPointerException
94		*/
95		public void testConstructor3() {
61	–
96		try {
97	<	LinkedBlockingQueue q = new LinkedBlockingQueue(null);
97	>	new LinkedBlockingQueue(null);
98		shouldThrow();
99	<	}
66	<	catch (NullPointerException success) {}
99	>	} catch (NullPointerException success) {}
100		}
101
102		/**
103	<	*
103	>	* Initializing from Collection of null elements throws NullPointerException
104		*/
105		public void testConstructor4() {
106	+	Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
107		try {
108	<	Integer[] ints = new Integer[SIZE];
75	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
108	>	new LinkedBlockingQueue(elements);
109		shouldThrow();
110	<	}
78	<	catch (NullPointerException success) {}
110	>	} catch (NullPointerException success) {}
111		}
112
113		/**
114	<	*
114	>	* Initializing from Collection with some null elements throws
115	>	* NullPointerException
116		*/
117		public void testConstructor5() {
118	+	Integer[] ints = new Integer[SIZE];
119	+	for (int i = 0; i < SIZE - 1; ++i)
120	+	ints[i] = new Integer(i);
121	+	Collection<Integer> elements = Arrays.asList(ints);
122		try {
123	<	Integer[] ints = new Integer[SIZE];
87	<	for (int i = 0; i < SIZE-1; ++i)
88	<	ints[i] = new Integer(i);
89	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
123	>	new LinkedBlockingQueue(elements);
124		shouldThrow();
125	<	}
92	<	catch (NullPointerException success) {}
125	>	} catch (NullPointerException success) {}
126		}
127
128		/**
129	<	*
129	>	* Queue contains all elements of collection used to initialize
130		*/
131		public void testConstructor6() {
132	<	try {
133	<	Integer[] ints = new Integer[SIZE];
134	<	for (int i = 0; i < SIZE; ++i)
135	<	ints[i] = new Integer(i);
136	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
137	<	for (int i = 0; i < SIZE; ++i)
105	<	assertEquals(ints[i], q.poll());
106	<	}
107	<	finally {}
132	>	Integer[] ints = new Integer[SIZE];
133	>	for (int i = 0; i < SIZE; ++i)
134	>	ints[i] = new Integer(i);
135	>	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
136	>	for (int i = 0; i < SIZE; ++i)
137	>	assertEquals(ints[i], q.poll());
138		}
139
140		/**
141	<	*
141	>	* Queue transitions from empty to full when elements added
142		*/
143		public void testEmptyFull() {
144		LinkedBlockingQueue q = new LinkedBlockingQueue(2);
#	Line 123 | Line 153 | public class LinkedBlockingQueueTest ext
153		}
154
155		/**
156	<	*
156	>	* remainingCapacity decreases on add, increases on remove
157		*/
158		public void testRemainingCapacity() {
159	<	LinkedBlockingQueue q = populatedQueue(SIZE);
159	>	BlockingQueue q = populatedQueue(SIZE);
160		for (int i = 0; i < SIZE; ++i) {
161		assertEquals(i, q.remainingCapacity());
162	<	assertEquals(SIZE-i, q.size());
163	<	q.remove();
162	>	assertEquals(SIZE, q.size() + q.remainingCapacity());
163	>	assertEquals(i, q.remove());
164		}
165		for (int i = 0; i < SIZE; ++i) {
166	<	assertEquals(SIZE-i, q.remainingCapacity());
167	<	assertEquals(i, q.size());
168	<	q.add(new Integer(i));
166	>	assertEquals(SIZE - i, q.remainingCapacity());
167	>	assertEquals(SIZE, q.size() + q.remainingCapacity());
168	>	assertTrue(q.add(i));
169		}
170		}
171
172		/**
173	<	*
144	<	*/
145	<	public void testOfferNull() {
146	<	try {
147	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
148	<	q.offer(null);
149	<	shouldThrow();
150	<	} catch (NullPointerException success) { }
151	<	}
152	<
153	<	/**
154	<	*
173	>	* Offer succeeds if not full; fails if full
174		*/
175		public void testOffer() {
176		LinkedBlockingQueue q = new LinkedBlockingQueue(1);
#	Line 160 | Line 179 | public class LinkedBlockingQueueTest ext
179		}
180
181		/**
182	<	*
182	>	* add succeeds if not full; throws IllegalStateException if full
183		*/
184		public void testAdd() {
185	<	try {
186	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
187	<	for (int i = 0; i < SIZE; ++i) {
188	<	assertTrue(q.add(new Integer(i)));
170	<	}
171	<	assertEquals(0, q.remainingCapacity());
172	<	q.add(new Integer(SIZE));
173	<	} catch (IllegalStateException success){
174	<	}
175	<	}
176	<
177	<	/**
178	<	*
179	<	*/
180	<	public void testAddAll1() {
185	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
186	>	for (int i = 0; i < SIZE; ++i)
187	>	assertTrue(q.add(new Integer(i)));
188	>	assertEquals(0, q.remainingCapacity());
189		try {
190	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
183	<	q.addAll(null);
190	>	q.add(new Integer(SIZE));
191		shouldThrow();
192	<	}
186	<	catch (NullPointerException success) {}
192	>	} catch (IllegalStateException success) {}
193		}
194	+
195		/**
196	<	*
196	>	* addAll(this) throws IllegalArgumentException
197		*/
198	<	public void testAddAll2() {
198	>	public void testAddAllSelf() {
199	>	LinkedBlockingQueue q = populatedQueue(SIZE);
200		try {
201	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
194	<	Integer[] ints = new Integer[SIZE];
195	<	q.addAll(Arrays.asList(ints));
201	>	q.addAll(q);
202		shouldThrow();
203	<	}
198	<	catch (NullPointerException success) {}
203	>	} catch (IllegalArgumentException success) {}
204		}
205	+
206		/**
207	<	*
207	>	* addAll of a collection with any null elements throws NPE after
208	>	* possibly adding some elements
209		*/
210		public void testAddAll3() {
211	+	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
212	+	Integer[] ints = new Integer[SIZE];
213	+	for (int i = 0; i < SIZE - 1; ++i)
214	+	ints[i] = new Integer(i);
215	+	Collection<Integer> elements = Arrays.asList(ints);
216		try {
217	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
206	<	Integer[] ints = new Integer[SIZE];
207	<	for (int i = 0; i < SIZE-1; ++i)
208	<	ints[i] = new Integer(i);
209	<	q.addAll(Arrays.asList(ints));
217	>	q.addAll(elements);
218		shouldThrow();
219	<	}
212	<	catch (NullPointerException success) {}
219	>	} catch (NullPointerException success) {}
220		}
221	+
222		/**
223	<	*
223	>	* addAll throws IllegalStateException if not enough room
224		*/
225		public void testAddAll4() {
226	+	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE - 1);
227	+	Integer[] ints = new Integer[SIZE];
228	+	for (int i = 0; i < SIZE; ++i)
229	+	ints[i] = new Integer(i);
230	+	Collection<Integer> elements = Arrays.asList(ints);
231		try {
232	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
220	<	Integer[] ints = new Integer[SIZE];
221	<	for (int i = 0; i < SIZE; ++i)
222	<	ints[i] = new Integer(i);
223	<	q.addAll(Arrays.asList(ints));
232	>	q.addAll(elements);
233		shouldThrow();
234	<	}
226	<	catch (IllegalStateException success) {}
234	>	} catch (IllegalStateException success) {}
235		}
236	+
237		/**
238	<	*
238	>	* Queue contains all elements, in traversal order, of successful addAll
239		*/
240		public void testAddAll5() {
241	<	try {
242	<	Integer[] empty = new Integer[0];
243	<	Integer[] ints = new Integer[SIZE];
244	<	for (int i = 0; i < SIZE; ++i)
245	<	ints[i] = new Integer(i);
246	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
247	<	assertFalse(q.addAll(Arrays.asList(empty)));
248	<	assertTrue(q.addAll(Arrays.asList(ints)));
249	<	for (int i = 0; i < SIZE; ++i)
241	<	assertEquals(ints[i], q.poll());
242	<	}
243	<	finally {}
244	<	}
245	<
246	<	/**
247	<	*
248	<	*/
249	<	public void testPutNull() {
250	<	try {
251	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
252	<	q.put(null);
253	<	shouldThrow();
254	<	}
255	<	catch (NullPointerException success){
256	<	}
257	<	catch (InterruptedException ie) {
258	<	unexpectedException();
259	<	}
260	<	}
261	<
262	<	/**
263	<	*
264	<	*/
265	<	public void testPut() {
266	<	try {
267	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
268	<	for (int i = 0; i < SIZE; ++i) {
269	<	Integer I = new Integer(i);
270	<	q.put(I);
271	<	assertTrue(q.contains(I));
272	<	}
273	<	assertEquals(0, q.remainingCapacity());
274	<	}
275	<	catch (InterruptedException ie) {
276	<	unexpectedException();
277	<	}
278	<	}
279	<
280	<	/**
281	<	*
282	<	*/
283	<	public void testBlockingPut() {
284	<	Thread t = new Thread(new Runnable() {
285	<	public void run() {
286	<	int added = 0;
287	<	try {
288	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
289	<	for (int i = 0; i < SIZE; ++i) {
290	<	q.put(new Integer(i));
291	<	++added;
292	<	}
293	<	q.put(new Integer(SIZE));
294	<	threadShouldThrow();
295	<	} catch (InterruptedException ie){
296	<	threadAssertEquals(added, SIZE);
297	<	}
298	<	}});
299	<	t.start();
300	<	try {
301	<	Thread.sleep(SHORT_DELAY_MS);
302	<	t.interrupt();
303	<	t.join();
304	<	}
305	<	catch (InterruptedException ie) {
306	<	unexpectedException();
307	<	}
241	>	Integer[] empty = new Integer[0];
242	>	Integer[] ints = new Integer[SIZE];
243	>	for (int i = 0; i < SIZE; ++i)
244	>	ints[i] = new Integer(i);
245	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
246	>	assertFalse(q.addAll(Arrays.asList(empty)));
247	>	assertTrue(q.addAll(Arrays.asList(ints)));
248	>	for (int i = 0; i < SIZE; ++i)
249	>	assertEquals(ints[i], q.poll());
250		}
251
252		/**
253	<	*
253	>	* all elements successfully put are contained
254		*/
255	<	public void testPutWithTake() {
256	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
257	<	Thread t = new Thread(new Runnable() {
258	<	public void run() {
259	<	int added = 0;
260	<	try {
319	<	q.put(new Object());
320	<	++added;
321	<	q.put(new Object());
322	<	++added;
323	<	q.put(new Object());
324	<	++added;
325	<	q.put(new Object());
326	<	++added;
327	<	threadShouldThrow();
328	<	} catch (InterruptedException e){
329	<	threadAssertTrue(added >= 2);
330	<	}
331	<	}
332	<	});
333	<	try {
334	<	t.start();
335	<	Thread.sleep(SHORT_DELAY_MS);
336	<	q.take();
337	<	t.interrupt();
338	<	t.join();
339	<	} catch (Exception e){
340	<	unexpectedException();
255	>	public void testPut() throws InterruptedException {
256	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
257	>	for (int i = 0; i < SIZE; ++i) {
258	>	Integer x = new Integer(i);
259	>	q.put(x);
260	>	assertTrue(q.contains(x));
261		}
262	+	assertEquals(0, q.remainingCapacity());
263		}
264
265		/**
266	<	*
266	>	* put blocks interruptibly if full
267		*/
268	<	public void testTimedOffer() {
269	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
270	<	Thread t = new Thread(new Runnable() {
271	<	public void run() {
272	<	try {
273	<	q.put(new Object());
274	<	q.put(new Object());
275	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
276	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
277	<	threadShouldThrow();
278	<	} catch (InterruptedException success){}
279	<	}
280	<	});
281	<
282	<	try {
283	<	t.start();
284	<	Thread.sleep(SMALL_DELAY_MS);
285	<	t.interrupt();
286	<	t.join();
287	<	} catch (Exception e){
288	<	unexpectedException();
289	<	}
268	>	public void testBlockingPut() throws InterruptedException {
269	>	final LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
270	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
271	>	Thread t = newStartedThread(new CheckedRunnable() {
272	>	public void realRun() throws InterruptedException {
273	>	for (int i = 0; i < SIZE; ++i)
274	>	q.put(i);
275	>	assertEquals(SIZE, q.size());
276	>	assertEquals(0, q.remainingCapacity());
277	>
278	>	Thread.currentThread().interrupt();
279	>	try {
280	>	q.put(99);
281	>	shouldThrow();
282	>	} catch (InterruptedException success) {}
283	>	assertFalse(Thread.interrupted());
284	>
285	>	pleaseInterrupt.countDown();
286	>	try {
287	>	q.put(99);
288	>	shouldThrow();
289	>	} catch (InterruptedException success) {}
290	>	assertFalse(Thread.interrupted());
291	>	}});
292	>
293	>	await(pleaseInterrupt);
294	>	assertThreadBlocks(t, Thread.State.WAITING);
295	>	t.interrupt();
296	>	awaitTermination(t);
297	>	assertEquals(SIZE, q.size());
298	>	assertEquals(0, q.remainingCapacity());
299		}
300
301		/**
302	<	*
302	>	* put blocks interruptibly waiting for take when full
303		*/
304	<	public void testTake() {
305	<	try {
306	<	LinkedBlockingQueue q = populatedQueue(SIZE);
307	<	for (int i = 0; i < SIZE; ++i) {
308	<	assertEquals(i, ((Integer)q.take()).intValue());
309	<	}
310	<	} catch (InterruptedException e){
311	<	unexpectedException();
312	<	}
304	>	public void testPutWithTake() throws InterruptedException {
305	>	final int capacity = 2;
306	>	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
307	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
308	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
309	>	Thread t = newStartedThread(new CheckedRunnable() {
310	>	public void realRun() throws InterruptedException {
311	>	for (int i = 0; i < capacity; i++)
312	>	q.put(i);
313	>	pleaseTake.countDown();
314	>	q.put(86);
315	>
316	>	Thread.currentThread().interrupt();
317	>	try {
318	>	q.put(99);
319	>	shouldThrow();
320	>	} catch (InterruptedException success) {}
321	>	assertFalse(Thread.interrupted());
322	>
323	>	pleaseInterrupt.countDown();
324	>	try {
325	>	q.put(99);
326	>	shouldThrow();
327	>	} catch (InterruptedException success) {}
328	>	assertFalse(Thread.interrupted());
329	>	}});
330	>
331	>	await(pleaseTake);
332	>	assertEquals(0, q.remainingCapacity());
333	>	assertEquals(0, q.take());
334	>
335	>	await(pleaseInterrupt);
336	>	assertThreadBlocks(t, Thread.State.WAITING);
337	>	t.interrupt();
338	>	awaitTermination(t);
339	>	assertEquals(0, q.remainingCapacity());
340		}
341
342		/**
343	<	*
343	>	* timed offer times out if full and elements not taken
344		*/
345	<	public void testTakeFromEmpty() {
345	>	public void testTimedOffer() {
346		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
347	<	Thread t = new Thread(new Runnable() {
348	<	public void run() {
349	<	try {
350	<	q.take();
351	<	threadShouldThrow();
352	<	} catch (InterruptedException success){ }
353	<	}
354	<	});
355	<	try {
356	<	t.start();
357	<	Thread.sleep(SHORT_DELAY_MS);
358	<	t.interrupt();
359	<	t.join();
360	<	} catch (Exception e){
361	<	unexpectedException();
362	<	}
347	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
348	>	Thread t = newStartedThread(new CheckedRunnable() {
349	>	public void realRun() throws InterruptedException {
350	>	q.put(new Object());
351	>	q.put(new Object());
352	>
353	>	long startTime = System.nanoTime();
354	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
355	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
356	>
357	>	Thread.currentThread().interrupt();
358	>	try {
359	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
360	>	shouldThrow();
361	>	} catch (InterruptedException success) {}
362	>	assertFalse(Thread.interrupted());
363	>
364	>	pleaseInterrupt.countDown();
365	>	try {
366	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
367	>	shouldThrow();
368	>	} catch (InterruptedException success) {}
369	>	assertFalse(Thread.interrupted());
370	>	}});
371	>
372	>	await(pleaseInterrupt);
373	>	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
374	>	t.interrupt();
375	>	awaitTermination(t);
376		}
377
378		/**
379	<	*
380	<	*/
381	<	public void testBlockingTake() {
382	<	Thread t = new Thread(new Runnable() {
383	<	public void run() {
384	<	try {
415	<	LinkedBlockingQueue q = populatedQueue(SIZE);
416	<	for (int i = 0; i < SIZE; ++i) {
417	<	assertEquals(i, ((Integer)q.take()).intValue());
418	<	}
419	<	q.take();
420	<	threadShouldThrow();
421	<	} catch (InterruptedException success){
422	<	}
423	<	}});
424	<	t.start();
425	<	try {
426	<	Thread.sleep(SHORT_DELAY_MS);
427	<	t.interrupt();
428	<	t.join();
429	<	}
430	<	catch (InterruptedException ie) {
431	<	unexpectedException();
379	>	* take retrieves elements in FIFO order
380	>	*/
381	>	public void testTake() throws InterruptedException {
382	>	LinkedBlockingQueue q = populatedQueue(SIZE);
383	>	for (int i = 0; i < SIZE; ++i) {
384	>	assertEquals(i, q.take());
385		}
386		}
387
388	+	/**
389	+	* Take removes existing elements until empty, then blocks interruptibly
390	+	*/
391	+	public void testBlockingTake() throws InterruptedException {
392	+	final BlockingQueue q = populatedQueue(SIZE);
393	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
394	+	Thread t = newStartedThread(new CheckedRunnable() {
395	+	public void realRun() throws InterruptedException {
396	+	for (int i = 0; i < SIZE; i++) assertEquals(i, q.take());
397	+
398	+	Thread.currentThread().interrupt();
399	+	try {
400	+	q.take();
401	+	shouldThrow();
402	+	} catch (InterruptedException success) {}
403	+	assertFalse(Thread.interrupted());
404	+
405	+	pleaseInterrupt.countDown();
406	+	try {
407	+	q.take();
408	+	shouldThrow();
409	+	} catch (InterruptedException success) {}
410	+	assertFalse(Thread.interrupted());
411	+	}});
412	+
413	+	await(pleaseInterrupt);
414	+	assertThreadBlocks(t, Thread.State.WAITING);
415	+	t.interrupt();
416	+	awaitTermination(t);
417	+	}
418
419		/**
420	<	*
420	>	* poll succeeds unless empty
421		*/
422		public void testPoll() {
423		LinkedBlockingQueue q = populatedQueue(SIZE);
424		for (int i = 0; i < SIZE; ++i) {
425	<	assertEquals(i, ((Integer)q.poll()).intValue());
425	>	assertEquals(i, q.poll());
426		}
427	<	assertNull(q.poll());
427	>	assertNull(q.poll());
428		}
429
430		/**
431	<	*
431	>	* timed poll with zero timeout succeeds when non-empty, else times out
432		*/
433	<	public void testTimedPoll0() {
434	<	try {
435	<	LinkedBlockingQueue q = populatedQueue(SIZE);
436	<	for (int i = 0; i < SIZE; ++i) {
437	<	assertEquals(i, ((Integer)q.poll(0, TimeUnit.MILLISECONDS)).intValue());
438	<	}
456	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
457	<	} catch (InterruptedException e){
458	<	unexpectedException();
459	<	}
433	>	public void testTimedPoll0() throws InterruptedException {
434	>	LinkedBlockingQueue q = populatedQueue(SIZE);
435	>	for (int i = 0; i < SIZE; ++i) {
436	>	assertEquals(i, q.poll(0, MILLISECONDS));
437	>	}
438	>	assertNull(q.poll(0, MILLISECONDS));
439		}
440
441		/**
442	<	*
442	>	* timed poll with nonzero timeout succeeds when non-empty, else times out
443		*/
444	<	public void testTimedPoll() {
445	<	try {
446	<	LinkedBlockingQueue q = populatedQueue(SIZE);
447	<	for (int i = 0; i < SIZE; ++i) {
448	<	assertEquals(i, ((Integer)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)).intValue());
449	<	}
450	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
451	<	} catch (InterruptedException e){
452	<	unexpectedException();
453	<	}
444	>	public void testTimedPoll() throws InterruptedException {
445	>	LinkedBlockingQueue<Integer> q = populatedQueue(SIZE);
446	>	for (int i = 0; i < SIZE; ++i) {
447	>	long startTime = System.nanoTime();
448	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
449	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
450	>	}
451	>	long startTime = System.nanoTime();
452	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
453	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
454	>	checkEmpty(q);
455		}
456
457		/**
458	<	*
459	<	*/
460	<	public void testInterruptedTimedPoll() {
461	<	Thread t = new Thread(new Runnable() {
462	<	public void run() {
463	<	try {
464	<	LinkedBlockingQueue q = populatedQueue(SIZE);
465	<	for (int i = 0; i < SIZE; ++i) {
466	<	threadAssertEquals(i, ((Integer)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)).intValue());
467	<	}
468	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
489	<	} catch (InterruptedException success){
490	<	}
491	<	}});
492	<	t.start();
493	<	try {
494	<	Thread.sleep(SHORT_DELAY_MS);
495	<	t.interrupt();
496	<	t.join();
497	<	}
498	<	catch (InterruptedException ie) {
499	<	unexpectedException();
500	<	}
501	<	}
458	>	* Interrupted timed poll throws InterruptedException instead of
459	>	* returning timeout status
460	>	*/
461	>	public void testInterruptedTimedPoll() throws InterruptedException {
462	>	final BlockingQueue<Integer> q = populatedQueue(SIZE);
463	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
464	>	Thread t = newStartedThread(new CheckedRunnable() {
465	>	public void realRun() throws InterruptedException {
466	>	long startTime = System.nanoTime();
467	>	for (int i = 0; i < SIZE; i++)
468	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
469
470	<	/**
471	<	*
472	<	*/
473	<	public void testTimedPollWithOffer() {
474	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
475	<	Thread t = new Thread(new Runnable() {
476	<	public void run() {
477	<	try {
478	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
479	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
480	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
481	<	threadShouldThrow();
482	<	} catch (InterruptedException success) { }
516	<	}
517	<	});
518	<	try {
519	<	t.start();
520	<	Thread.sleep(SMALL_DELAY_MS);
521	<	assertTrue(q.offer(zero, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
522	<	t.interrupt();
523	<	t.join();
524	<	} catch (Exception e){
525	<	unexpectedException();
526	<	}
527	<	}
470	>	Thread.currentThread().interrupt();
471	>	try {
472	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
473	>	shouldThrow();
474	>	} catch (InterruptedException success) {}
475	>	assertFalse(Thread.interrupted());
476	>
477	>	pleaseInterrupt.countDown();
478	>	try {
479	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
480	>	shouldThrow();
481	>	} catch (InterruptedException success) {}
482	>	assertFalse(Thread.interrupted());
483
484	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
485	+	}});
486	+
487	+	await(pleaseInterrupt);
488	+	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
489	+	t.interrupt();
490	+	awaitTermination(t);
491	+	checkEmpty(q);
492	+	}
493
494		/**
495	<	*
495	>	* peek returns next element, or null if empty
496		*/
497		public void testPeek() {
498		LinkedBlockingQueue q = populatedQueue(SIZE);
499		for (int i = 0; i < SIZE; ++i) {
500	<	assertEquals(i, ((Integer)q.peek()).intValue());
501	<	q.poll();
500	>	assertEquals(i, q.peek());
501	>	assertEquals(i, q.poll());
502		assertTrue(q.peek() == null ||
503	<	i != ((Integer)q.peek()).intValue());
503	>	!q.peek().equals(i));
504		}
505	<	assertNull(q.peek());
505	>	assertNull(q.peek());
506		}
507
508		/**
509	<	*
509	>	* element returns next element, or throws NSEE if empty
510		*/
511		public void testElement() {
512		LinkedBlockingQueue q = populatedQueue(SIZE);
513		for (int i = 0; i < SIZE; ++i) {
514	<	assertEquals(i, ((Integer)q.element()).intValue());
515	<	q.poll();
514	>	assertEquals(i, q.element());
515	>	assertEquals(i, q.poll());
516		}
517		try {
518		q.element();
519		shouldThrow();
520	<	}
557	<	catch (NoSuchElementException success) {}
520	>	} catch (NoSuchElementException success) {}
521		}
522
523		/**
524	<	*
524	>	* remove removes next element, or throws NSEE if empty
525		*/
526		public void testRemove() {
527		LinkedBlockingQueue q = populatedQueue(SIZE);
528		for (int i = 0; i < SIZE; ++i) {
529	<	assertEquals(i, ((Integer)q.remove()).intValue());
529	>	assertEquals(i, q.remove());
530		}
531		try {
532		q.remove();
533		shouldThrow();
534	<	} catch (NoSuchElementException success){
572	<	}
534	>	} catch (NoSuchElementException success) {}
535		}
536
537		/**
538	<	*
538	>	* An add following remove(x) succeeds
539		*/
540	<	public void testRemoveElement() {
541	<	LinkedBlockingQueue q = populatedQueue(SIZE);
542	<	for (int i = 1; i < SIZE; i+=2) {
543	<	assertTrue(q.remove(new Integer(i)));
544	<	}
545	<	for (int i = 0; i < SIZE; i+=2) {
546	<	assertTrue(q.remove(new Integer(i)));
547	<	assertFalse(q.remove(new Integer(i+1)));
586	<	}
587	<	assertTrue(q.isEmpty());
540	>	public void testRemoveElementAndAdd() throws InterruptedException {
541	>	LinkedBlockingQueue q = new LinkedBlockingQueue();
542	>	assertTrue(q.add(new Integer(1)));
543	>	assertTrue(q.add(new Integer(2)));
544	>	assertTrue(q.remove(new Integer(1)));
545	>	assertTrue(q.remove(new Integer(2)));
546	>	assertTrue(q.add(new Integer(3)));
547	>	assertNotNull(q.take());
548		}
549	<
549	>
550		/**
551	<	*
551	>	* contains(x) reports true when elements added but not yet removed
552		*/
553		public void testContains() {
554		LinkedBlockingQueue q = populatedQueue(SIZE);
#	Line 600 | Line 560 | public class LinkedBlockingQueueTest ext
560		}
561
562		/**
563	<	*
563	>	* clear removes all elements
564		*/
565		public void testClear() {
566		LinkedBlockingQueue q = populatedQueue(SIZE);
#	Line 610 | Line 570 | public class LinkedBlockingQueueTest ext
570		assertEquals(SIZE, q.remainingCapacity());
571		q.add(one);
572		assertFalse(q.isEmpty());
573	+	assertTrue(q.contains(one));
574		q.clear();
575		assertTrue(q.isEmpty());
576		}
577
578		/**
579	<	*
579	>	* containsAll(c) is true when c contains a subset of elements
580		*/
581		public void testContainsAll() {
582		LinkedBlockingQueue q = populatedQueue(SIZE);
#	Line 629 | Line 590 | public class LinkedBlockingQueueTest ext
590		}
591
592		/**
593	<	*
593	>	* retainAll(c) retains only those elements of c and reports true if changed
594		*/
595		public void testRetainAll() {
596		LinkedBlockingQueue q = populatedQueue(SIZE);
#	Line 642 | Line 603 | public class LinkedBlockingQueueTest ext
603		assertTrue(changed);
604
605		assertTrue(q.containsAll(p));
606	<	assertEquals(SIZE-i, q.size());
606	>	assertEquals(SIZE - i, q.size());
607		p.remove();
608		}
609		}
610
611		/**
612	<	*
612	>	* removeAll(c) removes only those elements of c and reports true if changed
613		*/
614		public void testRemoveAll() {
615		for (int i = 1; i < SIZE; ++i) {
616		LinkedBlockingQueue q = populatedQueue(SIZE);
617		LinkedBlockingQueue p = populatedQueue(i);
618		assertTrue(q.removeAll(p));
619	<	assertEquals(SIZE-i, q.size());
619	>	assertEquals(SIZE - i, q.size());
620		for (int j = 0; j < i; ++j) {
621	<	Integer I = (Integer)(p.remove());
622	<	assertFalse(q.contains(I));
621	>	Integer x = (Integer)(p.remove());
622	>	assertFalse(q.contains(x));
623		}
624		}
625		}
626
666	–
627		/**
628	<	*
628	>	* toArray contains all elements in FIFO order
629		*/
630		public void testToArray() {
631		LinkedBlockingQueue q = populatedQueue(SIZE);
632	<	Object[] o = q.toArray();
633	<	try {
634	<	for(int i = 0; i < o.length; i++)
635	<	assertEquals(o[i], q.take());
636	<	} catch (InterruptedException e){
677	<	unexpectedException();
678	<	}
632	>	Object[] a = q.toArray();
633	>	assertSame(Object[].class, a.getClass());
634	>	for (Object o : a)
635	>	assertSame(o, q.poll());
636	>	assertTrue(q.isEmpty());
637		}
638
639		/**
640	<	*
640	>	* toArray(a) contains all elements in FIFO order
641		*/
642	<	public void testToArray2() {
642	>	public void testToArray2() throws InterruptedException {
643	>	LinkedBlockingQueue<Integer> q = populatedQueue(SIZE);
644	>	Integer[] ints = new Integer[SIZE];
645	>	Integer[] array = q.toArray(ints);
646	>	assertSame(ints, array);
647	>	for (Integer o : ints)
648	>	assertSame(o, q.poll());
649	>	assertTrue(q.isEmpty());
650	>	}
651	>
652	>	/**
653	>	* toArray(incompatible array type) throws ArrayStoreException
654	>	*/
655	>	public void testToArray1_BadArg() {
656		LinkedBlockingQueue q = populatedQueue(SIZE);
657	<	Integer[] ints = new Integer[SIZE];
658	<	ints = (Integer[])q.toArray(ints);
659	<	try {
660	<	for(int i = 0; i < ints.length; i++)
690	<	assertEquals(ints[i], q.take());
691	<	} catch (InterruptedException e){
692	<	unexpectedException();
693	<	}
657	>	try {
658	>	q.toArray(new String[10]);
659	>	shouldThrow();
660	>	} catch (ArrayStoreException success) {}
661		}
662	<
662	>
663		/**
664	<	*
664	>	* iterator iterates through all elements
665		*/
666	<	public void testIterator() {
666	>	public void testIterator() throws InterruptedException {
667		LinkedBlockingQueue q = populatedQueue(SIZE);
668	<	Iterator it = q.iterator();
669	<	try {
670	<	while(it.hasNext()){
671	<	assertEquals(it.next(), q.take());
672	<	}
673	<	} catch (InterruptedException e){
674	<	unexpectedException();
675	<	}
668	>	Iterator it = q.iterator();
669	>	int i;
670	>	for (i = 0; it.hasNext(); i++)
671	>	assertTrue(q.contains(it.next()));
672	>	assertEquals(i, SIZE);
673	>	assertIteratorExhausted(it);
674	>
675	>	it = q.iterator();
676	>	for (i = 0; it.hasNext(); i++)
677	>	assertEquals(it.next(), q.take());
678	>	assertEquals(i, SIZE);
679	>	assertIteratorExhausted(it);
680		}
681
682		/**
683	<	*
683	>	* iterator of empty collection has no elements
684		*/
685	<	public void testIteratorOrdering() {
685	>	public void testEmptyIterator() {
686	>	assertIteratorExhausted(new LinkedBlockingQueue().iterator());
687	>	}
688
689	+	/**
690	+	* iterator.remove removes current element
691	+	*/
692	+	public void testIteratorRemove() {
693		final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
694	+	q.add(two);
695	+	q.add(one);
696	+	q.add(three);
697	+
698	+	Iterator it = q.iterator();
699	+	it.next();
700	+	it.remove();
701
702	+	it = q.iterator();
703	+	assertSame(it.next(), one);
704	+	assertSame(it.next(), three);
705	+	assertFalse(it.hasNext());
706	+	}
707	+
708	+	/**
709	+	* iterator ordering is FIFO
710	+	*/
711	+	public void testIteratorOrdering() {
712	+	final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
713		q.add(one);
714		q.add(two);
715		q.add(three);
721	–
716		assertEquals(0, q.remainingCapacity());
723	–
717		int k = 0;
718		for (Iterator it = q.iterator(); it.hasNext();) {
719	<	int i = ((Integer)(it.next())).intValue();
727	<	assertEquals(++k, i);
719	>	assertEquals(++k, it.next());
720		}
729	–
721		assertEquals(3, k);
722		}
723
724		/**
725	<	*
725	>	* Modifications do not cause iterators to fail
726		*/
727	<	public void testWeaklyConsistentIteration () {
737	<
727	>	public void testWeaklyConsistentIteration() {
728		final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
739	–
729		q.add(one);
730		q.add(two);
731		q.add(three);
732	<
733	<	try {
734	<	for (Iterator it = q.iterator(); it.hasNext();) {
746	<	q.remove();
747	<	it.next();
748	<	}
749	<	}
750	<	catch (ConcurrentModificationException e) {
751	<	unexpectedException();
732	>	for (Iterator it = q.iterator(); it.hasNext();) {
733	>	q.remove();
734	>	it.next();
735		}
753	–
736		assertEquals(0, q.size());
737		}
738
757	–
739		/**
740	<	*
740	>	* toString contains toStrings of elements
741		*/
742		public void testToString() {
743		LinkedBlockingQueue q = populatedQueue(SIZE);
744		String s = q.toString();
745		for (int i = 0; i < SIZE; ++i) {
746	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
746	>	assertTrue(s.contains(String.valueOf(i)));
747		}
748	<	}
768	<
748	>	}
749
750		/**
751	<	*
751	>	* offer transfers elements across Executor tasks
752		*/
753		public void testOfferInExecutor() {
774	–
754		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
776	–
755		q.add(one);
756		q.add(two);
757	+	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
758	+	final ExecutorService executor = Executors.newFixedThreadPool(2);
759	+	try (PoolCleaner cleaner = cleaner(executor)) {
760	+	executor.execute(new CheckedRunnable() {
761	+	public void realRun() throws InterruptedException {
762	+	assertFalse(q.offer(three));
763	+	threadsStarted.await();
764	+	assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS));
765	+	assertEquals(0, q.remainingCapacity());
766	+	}});
767
768	<	ExecutorService executor = Executors.newFixedThreadPool(2);
769	<
770	<	executor.execute(new Runnable() {
771	<	public void run() {
772	<	threadAssertFalse(q.offer(three));
773	<	try {
786	<	threadAssertTrue(q.offer(three, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
787	<	threadAssertEquals(0, q.remainingCapacity());
788	<	}
789	<	catch (InterruptedException e) {
790	<	threadUnexpectedException();
791	<	}
792	<	}
793	<	});
794	<
795	<	executor.execute(new Runnable() {
796	<	public void run() {
797	<	try {
798	<	Thread.sleep(SMALL_DELAY_MS);
799	<	threadAssertEquals(one, q.take());
800	<	}
801	<	catch (InterruptedException e) {
802	<	threadUnexpectedException();
803	<	}
804	<	}
805	<	});
806	<
807	<	joinPool(executor);
808	<
768	>	executor.execute(new CheckedRunnable() {
769	>	public void realRun() throws InterruptedException {
770	>	threadsStarted.await();
771	>	assertSame(one, q.take());
772	>	}});
773	>	}
774		}
775
776		/**
777	<	*
777	>	* timed poll retrieves elements across Executor threads
778		*/
779		public void testPollInExecutor() {
815	–
780		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
781	+	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
782	+	final ExecutorService executor = Executors.newFixedThreadPool(2);
783	+	try (PoolCleaner cleaner = cleaner(executor)) {
784	+	executor.execute(new CheckedRunnable() {
785	+	public void realRun() throws InterruptedException {
786	+	assertNull(q.poll());
787	+	threadsStarted.await();
788	+	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
789	+	checkEmpty(q);
790	+	}});
791
792	<	ExecutorService executor = Executors.newFixedThreadPool(2);
792	>	executor.execute(new CheckedRunnable() {
793	>	public void realRun() throws InterruptedException {
794	>	threadsStarted.await();
795	>	q.put(one);
796	>	}});
797	>	}
798	>	}
799
800	<	executor.execute(new Runnable() {
801	<	public void run() {
802	<	threadAssertNull(q.poll());
803	<	try {
804	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
805	<	threadAssertTrue(q.isEmpty());
826	<	}
827	<	catch (InterruptedException e) {
828	<	threadUnexpectedException();
829	<	}
830	<	}
831	<	});
800	>	/**
801	>	* A deserialized/reserialized queue has same elements in same order
802	>	*/
803	>	public void testSerialization() throws Exception {
804	>	Queue x = populatedQueue(SIZE);
805	>	Queue y = serialClone(x);
806
807	<	executor.execute(new Runnable() {
808	<	public void run() {
809	<	try {
810	<	Thread.sleep(SMALL_DELAY_MS);
811	<	q.put(one);
812	<	}
813	<	catch (InterruptedException e) {
814	<	threadUnexpectedException();
815	<	}
842	<	}
843	<	});
844	<
845	<	joinPool(executor);
807	>	assertNotSame(x, y);
808	>	assertEquals(x.size(), y.size());
809	>	assertEquals(x.toString(), y.toString());
810	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
811	>	while (!x.isEmpty()) {
812	>	assertFalse(y.isEmpty());
813	>	assertEquals(x.remove(), y.remove());
814	>	}
815	>	assertTrue(y.isEmpty());
816		}
817
818		/**
819	<	*
819	>	* drainTo(c) empties queue into another collection c
820		*/
821	<	public void testSerialization() {
821	>	public void testDrainTo() {
822		LinkedBlockingQueue q = populatedQueue(SIZE);
823	+	ArrayList l = new ArrayList();
824	+	q.drainTo(l);
825	+	assertEquals(0, q.size());
826	+	assertEquals(SIZE, l.size());
827	+	for (int i = 0; i < SIZE; ++i)
828	+	assertEquals(l.get(i), new Integer(i));
829	+	q.add(zero);
830	+	q.add(one);
831	+	assertFalse(q.isEmpty());
832	+	assertTrue(q.contains(zero));
833	+	assertTrue(q.contains(one));
834	+	l.clear();
835	+	q.drainTo(l);
836	+	assertEquals(0, q.size());
837	+	assertEquals(2, l.size());
838	+	for (int i = 0; i < 2; ++i)
839	+	assertEquals(l.get(i), new Integer(i));
840	+	}
841
842	<	try {
843	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
844	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
845	<	out.writeObject(q);
846	<	out.close();
842	>	/**
843	>	* drainTo empties full queue, unblocking a waiting put.
844	>	*/
845	>	public void testDrainToWithActivePut() throws InterruptedException {
846	>	final LinkedBlockingQueue q = populatedQueue(SIZE);
847	>	Thread t = new Thread(new CheckedRunnable() {
848	>	public void realRun() throws InterruptedException {
849	>	q.put(new Integer(SIZE + 1));
850	>	}});
851	>
852	>	t.start();
853	>	ArrayList l = new ArrayList();
854	>	q.drainTo(l);
855	>	assertTrue(l.size() >= SIZE);
856	>	for (int i = 0; i < SIZE; ++i)
857	>	assertEquals(l.get(i), new Integer(i));
858	>	t.join();
859	>	assertTrue(q.size() + l.size() >= SIZE);
860	>	}
861	>
862	>	/**
863	>	* drainTo(c, n) empties first min(n, size) elements of queue into c
864	>	*/
865	>	public void testDrainToN() {
866	>	LinkedBlockingQueue q = new LinkedBlockingQueue();
867	>	for (int i = 0; i < SIZE + 2; ++i) {
868	>	for (int j = 0; j < SIZE; j++)
869	>	assertTrue(q.offer(new Integer(j)));
870	>	ArrayList l = new ArrayList();
871	>	q.drainTo(l, i);
872	>	int k = (i < SIZE) ? i : SIZE;
873	>	assertEquals(k, l.size());
874	>	assertEquals(SIZE - k, q.size());
875	>	for (int j = 0; j < k; ++j)
876	>	assertEquals(l.get(j), new Integer(j));
877	>	do {} while (q.poll() != null);
878	>	}
879	>	}
880
881	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
882	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
883	<	LinkedBlockingQueue r = (LinkedBlockingQueue)in.readObject();
884	<	assertEquals(q.size(), r.size());
885	<	while (!q.isEmpty())
886	<	assertEquals(q.remove(), r.remove());
887	<	} catch(Exception e){
888	<	unexpectedException();
881	>	/**
882	>	* remove(null), contains(null) always return false
883	>	*/
884	>	public void testNeverContainsNull() {
885	>	Collection<?>[] qs = {
886	>	new LinkedBlockingQueue<Object>(),
887	>	populatedQueue(2),
888	>	};
889	>
890	>	for (Collection<?> q : qs) {
891	>	assertFalse(q.contains(null));
892	>	assertFalse(q.remove(null));
893		}
894		}
895

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