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

Comparing jsr166/src/test/tck/LinkedBlockingQueueTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.60 by jsr166, Sat May 23 00:53:08 2015 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	>	return newTestSuite(LinkedBlockingQueueTest.class,
45	>	new Unbounded().testSuite(),
46	>	new Bounded().testSuite());
47		}
48
23	–
49		/**
50	<	* Create a queue of given size containing consecutive
50	>	* Returns a new queue of given size containing consecutive
51		* Integers 0 ... n.
52		*/
53	<	private LinkedBlockingQueue populatedQueue(int n) {
54	<	LinkedBlockingQueue q = new LinkedBlockingQueue(n);
53	>	private LinkedBlockingQueue<Integer> populatedQueue(int n) {
54	>	LinkedBlockingQueue<Integer> q =
55	>	new LinkedBlockingQueue<Integer>(n);
56		assertTrue(q.isEmpty());
57	<	for(int i = 0; i < n; i++)
58	<	assertTrue(q.offer(new Integer(i)));
57	>	for (int i = 0; i < n; i++)
58	>	assertTrue(q.offer(new Integer(i)));
59		assertFalse(q.isEmpty());
60		assertEquals(0, q.remainingCapacity());
61	<	assertEquals(n, q.size());
61	>	assertEquals(n, q.size());
62		return q;
63		}
64	<
65	<	public void testConstructor1(){
64	>
65	>	/**
66	>	* A new queue has the indicated capacity, or Integer.MAX_VALUE if
67	>	* none given
68	>	*/
69	>	public void testConstructor1() {
70		assertEquals(SIZE, new LinkedBlockingQueue(SIZE).remainingCapacity());
71	+	assertEquals(Integer.MAX_VALUE, new LinkedBlockingQueue().remainingCapacity());
72		}
73
74	<	public void testConstructor2(){
74	>	/**
75	>	* Constructor throws IllegalArgumentException if capacity argument nonpositive
76	>	*/
77	>	public void testConstructor2() {
78		try {
79	<	LinkedBlockingQueue q = new LinkedBlockingQueue(0);
80	<	fail("Cannot make zero-sized");
81	<	}
48	<	catch (IllegalArgumentException success) {}
79	>	new LinkedBlockingQueue(0);
80	>	shouldThrow();
81	>	} catch (IllegalArgumentException success) {}
82		}
83
84	<	public void testConstructor3(){
85	<
84	>	/**
85	>	* Initializing from null Collection throws NullPointerException
86	>	*/
87	>	public void testConstructor3() {
88		try {
89	<	LinkedBlockingQueue q = new LinkedBlockingQueue(null);
90	<	fail("Cannot make from null collection");
91	<	}
57	<	catch (NullPointerException success) {}
89	>	new LinkedBlockingQueue(null);
90	>	shouldThrow();
91	>	} catch (NullPointerException success) {}
92		}
93
94	<	public void testConstructor4(){
94	>	/**
95	>	* Initializing from Collection of null elements throws NullPointerException
96	>	*/
97	>	public void testConstructor4() {
98	>	Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
99		try {
100	<	Integer[] ints = new Integer[SIZE];
101	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
102	<	fail("Cannot make with null elements");
65	<	}
66	<	catch (NullPointerException success) {}
100	>	new LinkedBlockingQueue(elements);
101	>	shouldThrow();
102	>	} catch (NullPointerException success) {}
103		}
104
105	<	public void testConstructor5(){
106	<	try {
107	<	Integer[] ints = new Integer[SIZE];
108	<	for (int i = 0; i < SIZE-1; ++i)
109	<	ints[i] = new Integer(i);
110	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
111	<	fail("Cannot make with null elements");
112	<	}
113	<	catch (NullPointerException success) {}
105	>	/**
106	>	* Initializing from Collection with some null elements throws
107	>	* NullPointerException
108	>	*/
109	>	public void testConstructor5() {
110	>	Integer[] ints = new Integer[SIZE];
111	>	for (int i = 0; i < SIZE - 1; ++i)
112	>	ints[i] = new Integer(i);
113	>	Collection<Integer> elements = Arrays.asList(ints);
114	>	try {
115	>	new LinkedBlockingQueue(elements);
116	>	shouldThrow();
117	>	} catch (NullPointerException success) {}
118		}
119
120	<	public void testConstructor6(){
121	<	try {
122	<	Integer[] ints = new Integer[SIZE];
123	<	for (int i = 0; i < SIZE; ++i)
124	<	ints[i] = new Integer(i);
125	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
126	<	for (int i = 0; i < SIZE; ++i)
127	<	assertEquals(ints[i], q.poll());
128	<	}
129	<	finally {}
120	>	/**
121	>	* Queue contains all elements of collection used to initialize
122	>	*/
123	>	public void testConstructor6() {
124	>	Integer[] ints = new Integer[SIZE];
125	>	for (int i = 0; i < SIZE; ++i)
126	>	ints[i] = new Integer(i);
127	>	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
128	>	for (int i = 0; i < SIZE; ++i)
129	>	assertEquals(ints[i], q.poll());
130		}
131
132	+	/**
133	+	* Queue transitions from empty to full when elements added
134	+	*/
135		public void testEmptyFull() {
136		LinkedBlockingQueue q = new LinkedBlockingQueue(2);
137		assertTrue(q.isEmpty());
#	Line 97 | Line 140 | public class LinkedBlockingQueueTest ext
140		assertFalse(q.isEmpty());
141		q.add(two);
142		assertFalse(q.isEmpty());
143	<	assertEquals("queue should be full", 0, q.remainingCapacity());
144	<	assertFalse("offer should be rejected", q.offer(three));
143	>	assertEquals(0, q.remainingCapacity());
144	>	assertFalse(q.offer(three));
145		}
146
147	<	public void testRemainingCapacity(){
148	<	LinkedBlockingQueue q = populatedQueue(SIZE);
147	>	/**
148	>	* remainingCapacity decreases on add, increases on remove
149	>	*/
150	>	public void testRemainingCapacity() {
151	>	BlockingQueue q = populatedQueue(SIZE);
152		for (int i = 0; i < SIZE; ++i) {
153		assertEquals(i, q.remainingCapacity());
154	<	assertEquals(SIZE-i, q.size());
155	<	q.remove();
154	>	assertEquals(SIZE, q.size() + q.remainingCapacity());
155	>	assertEquals(i, q.remove());
156		}
157		for (int i = 0; i < SIZE; ++i) {
158	<	assertEquals(SIZE-i, q.remainingCapacity());
159	<	assertEquals(i, q.size());
160	<	q.add(new Integer(i));
158	>	assertEquals(SIZE - i, q.remainingCapacity());
159	>	assertEquals(SIZE, q.size() + q.remainingCapacity());
160	>	assertTrue(q.add(i));
161		}
162		}
163
164	<	public void testOfferNull(){
165	<	try {
166	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
167	<	q.offer(null);
122	<	fail("should throw NPE");
123	<	} catch (NullPointerException success) { }
124	<	}
125	<
126	<	public void testOffer(){
164	>	/**
165	>	* Offer succeeds if not full; fails if full
166	>	*/
167	>	public void testOffer() {
168		LinkedBlockingQueue q = new LinkedBlockingQueue(1);
169		assertTrue(q.offer(zero));
170		assertFalse(q.offer(one));
171		}
172
173	<	public void testAdd(){
174	<	try {
175	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
176	<	for (int i = 0; i < SIZE; ++i) {
177	<	assertTrue(q.add(new Integer(i)));
178	<	}
179	<	assertEquals(0, q.remainingCapacity());
173	>	/**
174	>	* add succeeds if not full; throws IllegalStateException if full
175	>	*/
176	>	public void testAdd() {
177	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
178	>	for (int i = 0; i < SIZE; ++i)
179	>	assertTrue(q.add(new Integer(i)));
180	>	assertEquals(0, q.remainingCapacity());
181	>	try {
182		q.add(new Integer(SIZE));
183	<	} catch (IllegalStateException success){
184	<	}
183	>	shouldThrow();
184	>	} catch (IllegalStateException success) {}
185		}
186
187	<	public void testAddAll1(){
187	>	/**
188	>	* addAll(this) throws IllegalArgumentException
189	>	*/
190	>	public void testAddAllSelf() {
191	>	LinkedBlockingQueue q = populatedQueue(SIZE);
192		try {
193	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
194	<	q.addAll(null);
195	<	fail("Cannot add null collection");
149	<	}
150	<	catch (NullPointerException success) {}
151	<	}
152	<	public void testAddAll2(){
153	<	try {
154	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
155	<	Integer[] ints = new Integer[SIZE];
156	<	q.addAll(Arrays.asList(ints));
157	<	fail("Cannot add null elements");
158	<	}
159	<	catch (NullPointerException success) {}
160	<	}
161	<	public void testAddAll3(){
162	<	try {
163	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
164	<	Integer[] ints = new Integer[SIZE];
165	<	for (int i = 0; i < SIZE-1; ++i)
166	<	ints[i] = new Integer(i);
167	<	q.addAll(Arrays.asList(ints));
168	<	fail("Cannot add null elements");
169	<	}
170	<	catch (NullPointerException success) {}
171	<	}
172	<	public void testAddAll4(){
173	<	try {
174	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
175	<	Integer[] ints = new Integer[SIZE];
176	<	for (int i = 0; i < SIZE; ++i)
177	<	ints[i] = new Integer(i);
178	<	q.addAll(Arrays.asList(ints));
179	<	fail("Cannot add with insufficient capacity");
180	<	}
181	<	catch (IllegalStateException success) {}
182	<	}
183	<	public void testAddAll5(){
184	<	try {
185	<	Integer[] empty = new Integer[0];
186	<	Integer[] ints = new Integer[SIZE];
187	<	for (int i = 0; i < SIZE; ++i)
188	<	ints[i] = new Integer(i);
189	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
190	<	assertFalse(q.addAll(Arrays.asList(empty)));
191	<	assertTrue(q.addAll(Arrays.asList(ints)));
192	<	for (int i = 0; i < SIZE; ++i)
193	<	assertEquals(ints[i], q.poll());
194	<	}
195	<	finally {}
196	<	}
197	<
198	<	public void testPutNull() {
199	<	try {
200	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
201	<	q.put(null);
202	<	fail("put should throw NPE");
203	<	}
204	<	catch (NullPointerException success){
205	<	}
206	<	catch (InterruptedException ie) {
207	<	fail("Unexpected exception");
208	<	}
209	<	}
210	<
211	<	public void testPut() {
212	<	try {
213	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
214	<	for (int i = 0; i < SIZE; ++i) {
215	<	Integer I = new Integer(i);
216	<	q.put(I);
217	<	assertTrue(q.contains(I));
218	<	}
219	<	assertEquals(0, q.remainingCapacity());
220	<	}
221	<	catch (InterruptedException ie) {
222	<	fail("Unexpected exception");
223	<	}
224	<	}
225	<
226	<	public void testBlockingPut(){
227	<	Thread t = new Thread(new Runnable() {
228	<	public void run() {
229	<	int added = 0;
230	<	try {
231	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
232	<	for (int i = 0; i < SIZE; ++i) {
233	<	q.put(new Integer(i));
234	<	++added;
235	<	}
236	<	q.put(new Integer(SIZE));
237	<	threadFail("put should block");
238	<	} catch (InterruptedException ie){
239	<	threadAssertEquals(added, SIZE);
240	<	}
241	<	}});
242	<	t.start();
243	<	try {
244	<	Thread.sleep(SHORT_DELAY_MS);
245	<	t.interrupt();
246	<	t.join();
247	<	}
248	<	catch (InterruptedException ie) {
249	<	fail("Unexpected exception");
250	<	}
193	>	q.addAll(q);
194	>	shouldThrow();
195	>	} catch (IllegalArgumentException success) {}
196		}
197
198	<	public void testPutWithTake() {
199	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
200	<	Thread t = new Thread(new Runnable() {
201	<	public void run(){
202	<	int added = 0;
203	<	try {
204	<	q.put(new Object());
205	<	++added;
206	<	q.put(new Object());
207	<	++added;
208	<	q.put(new Object());
209	<	++added;
210	<	q.put(new Object());
211	<	++added;
267	<	threadFail("Should block");
268	<	} catch (InterruptedException e){
269	<	threadAssertTrue(added >= 2);
270	<	}
271	<	}
272	<	});
273	<	try {
274	<	t.start();
275	<	Thread.sleep(SHORT_DELAY_MS);
276	<	q.take();
277	<	t.interrupt();
278	<	t.join();
279	<	} catch (Exception e){
280	<	fail("Unexpected exception");
281	<	}
198	>	/**
199	>	* addAll of a collection with any null elements throws NPE after
200	>	* possibly adding some elements
201	>	*/
202	>	public void testAddAll3() {
203	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
204	>	Integer[] ints = new Integer[SIZE];
205	>	for (int i = 0; i < SIZE - 1; ++i)
206	>	ints[i] = new Integer(i);
207	>	Collection<Integer> elements = Arrays.asList(ints);
208	>	try {
209	>	q.addAll(elements);
210	>	shouldThrow();
211	>	} catch (NullPointerException success) {}
212		}
213
214	<	public void testTimedOffer() {
215	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
216	<	Thread t = new Thread(new Runnable() {
217	<	public void run(){
218	<	try {
219	<	q.put(new Object());
220	<	q.put(new Object());
221	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
222	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
223	<	threadFail("Should block");
224	<	} catch (InterruptedException success){}
225	<	}
226	<	});
297	<
298	<	try {
299	<	t.start();
300	<	Thread.sleep(SMALL_DELAY_MS);
301	<	t.interrupt();
302	<	t.join();
303	<	} catch (Exception e){
304	<	fail("Unexpected exception");
305	<	}
214	>	/**
215	>	* addAll throws IllegalStateException if not enough room
216	>	*/
217	>	public void testAddAll4() {
218	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE - 1);
219	>	Integer[] ints = new Integer[SIZE];
220	>	for (int i = 0; i < SIZE; ++i)
221	>	ints[i] = new Integer(i);
222	>	Collection<Integer> elements = Arrays.asList(ints);
223	>	try {
224	>	q.addAll(elements);
225	>	shouldThrow();
226	>	} catch (IllegalStateException success) {}
227		}
228
229	<	public void testTake(){
230	<	try {
231	<	LinkedBlockingQueue q = populatedQueue(SIZE);
232	<	for (int i = 0; i < SIZE; ++i) {
233	<	assertEquals(i, ((Integer)q.take()).intValue());
234	<	}
235	<	} catch (InterruptedException e){
236	<	fail("Unexpected exception");
237	<	}
229	>	/**
230	>	* Queue contains all elements, in traversal order, of successful addAll
231	>	*/
232	>	public void testAddAll5() {
233	>	Integer[] empty = new Integer[0];
234	>	Integer[] ints = new Integer[SIZE];
235	>	for (int i = 0; i < SIZE; ++i)
236	>	ints[i] = new Integer(i);
237	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
238	>	assertFalse(q.addAll(Arrays.asList(empty)));
239	>	assertTrue(q.addAll(Arrays.asList(ints)));
240	>	for (int i = 0; i < SIZE; ++i)
241	>	assertEquals(ints[i], q.poll());
242		}
243
244	<	public void testTakeFromEmpty() {
245	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
246	<	Thread t = new Thread(new Runnable() {
247	<	public void run(){
248	<	try {
249	<	q.take();
250	<	threadFail("Should block");
251	<	} catch (InterruptedException success){ }
252	<	}
328	<	});
329	<	try {
330	<	t.start();
331	<	Thread.sleep(SHORT_DELAY_MS);
332	<	t.interrupt();
333	<	t.join();
334	<	} catch (Exception e){
335	<	fail("Unexpected exception");
244	>	/**
245	>	* all elements successfully put are contained
246	>	*/
247	>	public void testPut() throws InterruptedException {
248	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
249	>	for (int i = 0; i < SIZE; ++i) {
250	>	Integer x = new Integer(i);
251	>	q.put(x);
252	>	assertTrue(q.contains(x));
253		}
254	+	assertEquals(0, q.remainingCapacity());
255		}
256
257	<	public void testBlockingTake(){
258	<	Thread t = new Thread(new Runnable() {
259	<	public void run() {
260	<	try {
261	<	LinkedBlockingQueue q = populatedQueue(SIZE);
262	<	for (int i = 0; i < SIZE; ++i) {
263	<	assertEquals(i, ((Integer)q.take()).intValue());
264	<	}
265	<	q.take();
266	<	threadFail("take should block");
267	<	} catch (InterruptedException success){
268	<	}
269	<	}});
270	<	t.start();
271	<	try {
272	<	Thread.sleep(SHORT_DELAY_MS);
273	<	t.interrupt();
274	<	t.join();
275	<	}
276	<	catch (InterruptedException ie) {
277	<	fail("Unexpected exception");
278	<	}
257	>	/**
258	>	* put blocks interruptibly if full
259	>	*/
260	>	public void testBlockingPut() throws InterruptedException {
261	>	final LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
262	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
263	>	Thread t = newStartedThread(new CheckedRunnable() {
264	>	public void realRun() throws InterruptedException {
265	>	for (int i = 0; i < SIZE; ++i)
266	>	q.put(i);
267	>	assertEquals(SIZE, q.size());
268	>	assertEquals(0, q.remainingCapacity());
269	>
270	>	Thread.currentThread().interrupt();
271	>	try {
272	>	q.put(99);
273	>	shouldThrow();
274	>	} catch (InterruptedException success) {}
275	>	assertFalse(Thread.interrupted());
276	>
277	>	pleaseInterrupt.countDown();
278	>	try {
279	>	q.put(99);
280	>	shouldThrow();
281	>	} catch (InterruptedException success) {}
282	>	assertFalse(Thread.interrupted());
283	>	}});
284	>
285	>	await(pleaseInterrupt);
286	>	assertThreadStaysAlive(t);
287	>	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	<	public void testPoll(){
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, ((Integer)q.poll()).intValue());
359	>	assertEquals(i, q.take());
360		}
369	–	assertNull(q.poll());
361		}
362
363	<	public void testTimedPoll0() {
364	<	try {
365	<	LinkedBlockingQueue q = populatedQueue(SIZE);
366	<	for (int i = 0; i < SIZE; ++i) {
367	<	assertEquals(i, ((Integer)q.poll(0, TimeUnit.MILLISECONDS)).intValue());
368	<	}
369	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
370	<	} catch (InterruptedException e){
371	<	fail("Unexpected exception");
372	<	}
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	<	public void testTimedPoll() {
397	<	try {
398	<	LinkedBlockingQueue q = populatedQueue(SIZE);
399	<	for (int i = 0; i < SIZE; ++i) {
400	<	assertEquals(i, ((Integer)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)).intValue());
401	<	}
402	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
391	<	} catch (InterruptedException e){
392	<	fail("Unexpected exception");
393	<	}
394	<	}
395	<
396	<	public void testInterruptedTimedPoll(){
397	<	Thread t = new Thread(new Runnable() {
398	<	public void run() {
399	<	try {
400	<	LinkedBlockingQueue q = populatedQueue(SIZE);
401	<	for (int i = 0; i < SIZE; ++i) {
402	<	threadAssertEquals(i, ((Integer)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)).intValue());
403	<	}
404	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
405	<	} catch (InterruptedException success){
406	<	}
407	<	}});
408	<	t.start();
409	<	try {
410	<	Thread.sleep(SHORT_DELAY_MS);
411	<	t.interrupt();
412	<	t.join();
413	<	}
414	<	catch (InterruptedException ie) {
415	<	fail("Unexpected exception");
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	<	public void testTimedPollWithOffer(){
408	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
409	<	Thread t = new Thread(new Runnable() {
410	<	public void run(){
411	<	try {
412	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
413	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
426	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
427	<	threadFail("Should block");
428	<	} catch (InterruptedException success) { }
429	<	}
430	<	});
431	<	try {
432	<	t.start();
433	<	Thread.sleep(SMALL_DELAY_MS);
434	<	assertTrue(q.offer(zero, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
435	<	t.interrupt();
436	<	t.join();
437	<	} catch (Exception e){
438	<	fail("Unexpected exception");
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	<	}
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	+	for (int i = 0; i < SIZE; ++i) {
444	+	long t0 = System.nanoTime();
445	+	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
446	+	assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS);
447	+	}
448	+	long t0 = System.nanoTime();
449	+	aboutToWait.countDown();
450	+	try {
451	+	q.poll(MEDIUM_DELAY_MS, MILLISECONDS);
452	+	shouldThrow();
453	+	} catch (InterruptedException success) {
454	+	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
455	+	}
456	+	}});
457	+
458	+	aboutToWait.await();
459	+	waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
460	+	t.interrupt();
461	+	awaitTermination(t, MEDIUM_DELAY_MS);
462	+	checkEmpty(q);
463	+	}
464
465	<	public void testPeek(){
465	>	/**
466	>	* peek returns next element, or null if empty
467	>	*/
468	>	public void testPeek() {
469		LinkedBlockingQueue q = populatedQueue(SIZE);
470		for (int i = 0; i < SIZE; ++i) {
471	<	assertEquals(i, ((Integer)q.peek()).intValue());
472	<	q.poll();
471	>	assertEquals(i, q.peek());
472	>	assertEquals(i, q.poll());
473		assertTrue(q.peek() == null ||
474	<	i != ((Integer)q.peek()).intValue());
474	>	!q.peek().equals(i));
475		}
476	<	assertNull(q.peek());
476	>	assertNull(q.peek());
477		}
478
479	<	public void testElement(){
479	>	/**
480	>	* element returns next element, or throws NSEE if empty
481	>	*/
482	>	public void testElement() {
483		LinkedBlockingQueue q = populatedQueue(SIZE);
484		for (int i = 0; i < SIZE; ++i) {
485	<	assertEquals(i, ((Integer)q.element()).intValue());
486	<	q.poll();
485	>	assertEquals(i, q.element());
486	>	assertEquals(i, q.poll());
487		}
488		try {
489		q.element();
490	<	fail("no such element");
491	<	}
464	<	catch (NoSuchElementException success) {}
490	>	shouldThrow();
491	>	} catch (NoSuchElementException success) {}
492		}
493
494	<	public void testRemove(){
494	>	/**
495	>	* remove removes next element, or throws NSEE if empty
496	>	*/
497	>	public void testRemove() {
498		LinkedBlockingQueue q = populatedQueue(SIZE);
499		for (int i = 0; i < SIZE; ++i) {
500	<	assertEquals(i, ((Integer)q.remove()).intValue());
500	>	assertEquals(i, q.remove());
501		}
502		try {
503		q.remove();
504	<	fail("remove should throw");
505	<	} catch (NoSuchElementException success){
476	<	}
504	>	shouldThrow();
505	>	} catch (NoSuchElementException success) {}
506		}
507
508	<	public void testRemoveElement(){
509	<	LinkedBlockingQueue q = populatedQueue(SIZE);
510	<	for (int i = 1; i < SIZE; i+=2) {
511	<	assertTrue(q.remove(new Integer(i)));
512	<	}
513	<	for (int i = 0; i < SIZE; i+=2) {
514	<	assertTrue(q.remove(new Integer(i)));
515	<	assertFalse(q.remove(new Integer(i+1)));
516	<	}
517	<	assertTrue(q.isEmpty());
508	>	/**
509	>	* An add following remove(x) succeeds
510	>	*/
511	>	public void testRemoveElementAndAdd() throws InterruptedException {
512	>	LinkedBlockingQueue q = new LinkedBlockingQueue();
513	>	assertTrue(q.add(new Integer(1)));
514	>	assertTrue(q.add(new Integer(2)));
515	>	assertTrue(q.remove(new Integer(1)));
516	>	assertTrue(q.remove(new Integer(2)));
517	>	assertTrue(q.add(new Integer(3)));
518	>	assertNotNull(q.take());
519		}
520	<
521	<	public void testContains(){
520	>
521	>	/**
522	>	* contains(x) reports true when elements added but not yet removed
523	>	*/
524	>	public void testContains() {
525		LinkedBlockingQueue q = populatedQueue(SIZE);
526		for (int i = 0; i < SIZE; ++i) {
527		assertTrue(q.contains(new Integer(i)));
#	Line 497 | Line 530 | public class LinkedBlockingQueueTest ext
530		}
531		}
532
533	<	public void testClear(){
533	>	/**
534	>	* clear removes all elements
535	>	*/
536	>	public void testClear() {
537		LinkedBlockingQueue q = populatedQueue(SIZE);
538		q.clear();
539		assertTrue(q.isEmpty());
#	Line 505 | Line 541 | public class LinkedBlockingQueueTest ext
541		assertEquals(SIZE, q.remainingCapacity());
542		q.add(one);
543		assertFalse(q.isEmpty());
544	+	assertTrue(q.contains(one));
545		q.clear();
546		assertTrue(q.isEmpty());
547		}
548
549	<	public void testContainsAll(){
549	>	/**
550	>	* containsAll(c) is true when c contains a subset of elements
551	>	*/
552	>	public void testContainsAll() {
553		LinkedBlockingQueue q = populatedQueue(SIZE);
554		LinkedBlockingQueue p = new LinkedBlockingQueue(SIZE);
555		for (int i = 0; i < SIZE; ++i) {
#	Line 520 | Line 560 | public class LinkedBlockingQueueTest ext
560		assertTrue(p.containsAll(q));
561		}
562
563	<	public void testRetainAll(){
563	>	/**
564	>	* retainAll(c) retains only those elements of c and reports true if changed
565	>	*/
566	>	public void testRetainAll() {
567		LinkedBlockingQueue q = populatedQueue(SIZE);
568		LinkedBlockingQueue p = populatedQueue(SIZE);
569		for (int i = 0; i < SIZE; ++i) {
#	Line 531 | Line 574 | public class LinkedBlockingQueueTest ext
574		assertTrue(changed);
575
576		assertTrue(q.containsAll(p));
577	<	assertEquals(SIZE-i, q.size());
577	>	assertEquals(SIZE - i, q.size());
578		p.remove();
579		}
580		}
581
582	<	public void testRemoveAll(){
582	>	/**
583	>	* removeAll(c) removes only those elements of c and reports true if changed
584	>	*/
585	>	public void testRemoveAll() {
586		for (int i = 1; i < SIZE; ++i) {
587		LinkedBlockingQueue q = populatedQueue(SIZE);
588		LinkedBlockingQueue p = populatedQueue(i);
589		assertTrue(q.removeAll(p));
590	<	assertEquals(SIZE-i, q.size());
590	>	assertEquals(SIZE - i, q.size());
591		for (int j = 0; j < i; ++j) {
592	<	Integer I = (Integer)(p.remove());
593	<	assertFalse(q.contains(I));
592	>	Integer x = (Integer)(p.remove());
593	>	assertFalse(q.contains(x));
594		}
595		}
596		}
597
598	+	/**
599	+	* toArray contains all elements in FIFO order
600	+	*/
601	+	public void testToArray() {
602	+	LinkedBlockingQueue q = populatedQueue(SIZE);
603	+	Object[] o = q.toArray();
604	+	for (int i = 0; i < o.length; i++)
605	+	assertSame(o[i], q.poll());
606	+	}
607
608	<	public void testToArray(){
608	>	/**
609	>	* toArray(a) contains all elements in FIFO order
610	>	*/
611	>	public void testToArray2() throws InterruptedException {
612	>	LinkedBlockingQueue<Integer> q = populatedQueue(SIZE);
613	>	Integer[] ints = new Integer[SIZE];
614	>	Integer[] array = q.toArray(ints);
615	>	assertSame(ints, array);
616	>	for (int i = 0; i < ints.length; i++)
617	>	assertSame(ints[i], q.poll());
618	>	}
619	>
620	>	/**
621	>	* toArray(incompatible array type) throws ArrayStoreException
622	>	*/
623	>	public void testToArray1_BadArg() {
624		LinkedBlockingQueue q = populatedQueue(SIZE);
625	<	Object[] o = q.toArray();
626	<	try {
627	<	for(int i = 0; i < o.length; i++)
628	<	assertEquals(o[i], q.take());
559	<	} catch (InterruptedException e){
560	<	fail("Unexpected exception");
561	<	}
562	<	}
563	<
564	<	public void testToArray2(){
565	<	LinkedBlockingQueue q = populatedQueue(SIZE);
566	<	Integer[] ints = new Integer[SIZE];
567	<	ints = (Integer[])q.toArray(ints);
568	<	try {
569	<	for(int i = 0; i < ints.length; i++)
570	<	assertEquals(ints[i], q.take());
571	<	} catch (InterruptedException e){
572	<	fail("Unexpected exception");
573	<	}
574	<	}
575	<
576	<	public void testIterator(){
577	<	LinkedBlockingQueue q = populatedQueue(SIZE);
578	<	Iterator it = q.iterator();
579	<	try {
580	<	while(it.hasNext()){
581	<	assertEquals(it.next(), q.take());
582	<	}
583	<	} catch (InterruptedException e){
584	<	fail("Unexpected exception");
585	<	}
625	>	try {
626	>	q.toArray(new String[10]);
627	>	shouldThrow();
628	>	} catch (ArrayStoreException success) {}
629		}
630
631	<	public void testIteratorOrdering() {
631	>	/**
632	>	* iterator iterates through all elements
633	>	*/
634	>	public void testIterator() throws InterruptedException {
635	>	LinkedBlockingQueue q = populatedQueue(SIZE);
636	>	Iterator it = q.iterator();
637	>	int i;
638	>	for (i = 0; it.hasNext(); i++)
639	>	assertTrue(q.contains(it.next()));
640	>	assertEquals(i, SIZE);
641	>	assertIteratorExhausted(it);
642	>
643	>	it = q.iterator();
644	>	for (i = 0; it.hasNext(); i++)
645	>	assertEquals(it.next(), q.take());
646	>	assertEquals(i, SIZE);
647	>	assertIteratorExhausted(it);
648	>	}
649
650	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
650	>	/**
651	>	* iterator of empty collection has no elements
652	>	*/
653	>	public void testEmptyIterator() {
654	>	assertIteratorExhausted(new LinkedBlockingQueue().iterator());
655	>	}
656
657	<	q.add(one);
657	>	/**
658	>	* iterator.remove removes current element
659	>	*/
660	>	public void testIteratorRemove() {
661	>	final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
662		q.add(two);
663	+	q.add(one);
664		q.add(three);
665
666	<	assertEquals("queue should be full", 0, q.remainingCapacity());
666	>	Iterator it = q.iterator();
667	>	it.next();
668	>	it.remove();
669	>
670	>	it = q.iterator();
671	>	assertSame(it.next(), one);
672	>	assertSame(it.next(), three);
673	>	assertFalse(it.hasNext());
674	>	}
675
676	+	/**
677	+	* iterator ordering is FIFO
678	+	*/
679	+	public void testIteratorOrdering() {
680	+	final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
681	+	q.add(one);
682	+	q.add(two);
683	+	q.add(three);
684	+	assertEquals(0, q.remainingCapacity());
685		int k = 0;
686		for (Iterator it = q.iterator(); it.hasNext();) {
687	<	int i = ((Integer)(it.next())).intValue();
601	<	assertEquals("items should come out in order", ++k, i);
687	>	assertEquals(++k, it.next());
688		}
689	<
604	<	assertEquals("should go through 3 elements", 3, k);
689	>	assertEquals(3, k);
690		}
691
692	<	public void testWeaklyConsistentIteration () {
693	<
692	>	/**
693	>	* Modifications do not cause iterators to fail
694	>	*/
695	>	public void testWeaklyConsistentIteration() {
696		final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
610	–
697		q.add(one);
698		q.add(two);
699		q.add(three);
700	<
701	<	try {
702	<	for (Iterator it = q.iterator(); it.hasNext();) {
617	<	q.remove();
618	<	it.next();
619	<	}
620	<	}
621	<	catch (ConcurrentModificationException e) {
622	<	fail("weakly consistent iterator; should not get CME");
700	>	for (Iterator it = q.iterator(); it.hasNext();) {
701	>	q.remove();
702	>	it.next();
703		}
704	<
625	<	assertEquals("queue should be empty again", 0, q.size());
704	>	assertEquals(0, q.size());
705		}
706
707	<
708	<	public void testToString(){
707	>	/**
708	>	* toString contains toStrings of elements
709	>	*/
710	>	public void testToString() {
711		LinkedBlockingQueue q = populatedQueue(SIZE);
712		String s = q.toString();
713		for (int i = 0; i < SIZE; ++i) {
714	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
714	>	assertTrue(s.contains(String.valueOf(i)));
715		}
716	<	}
636	<
716	>	}
717
718	+	/**
719	+	* offer transfers elements across Executor tasks
720	+	*/
721		public void testOfferInExecutor() {
639	–
722		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
641	–
723		q.add(one);
724		q.add(two);
644	–
725		ExecutorService executor = Executors.newFixedThreadPool(2);
726	+	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
727	+	executor.execute(new CheckedRunnable() {
728	+	public void realRun() throws InterruptedException {
729	+	assertFalse(q.offer(three));
730	+	threadsStarted.await();
731	+	assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS));
732	+	assertEquals(0, q.remainingCapacity());
733	+	}});
734	+
735	+	executor.execute(new CheckedRunnable() {
736	+	public void realRun() throws InterruptedException {
737	+	threadsStarted.await();
738	+	assertSame(one, q.take());
739	+	}});
740
647	–	executor.execute(new Runnable() {
648	–	public void run() {
649	–	threadAssertFalse(q.offer(three));
650	–	try {
651	–	threadAssertTrue(q.offer(three, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
652	–	threadAssertEquals(0, q.remainingCapacity());
653	–	}
654	–	catch (InterruptedException e) {
655	–	threadFail("should not be interrupted");
656	–	}
657	–	}
658	–	});
659	–
660	–	executor.execute(new Runnable() {
661	–	public void run() {
662	–	try {
663	–	Thread.sleep(SMALL_DELAY_MS);
664	–	threadAssertEquals(one, q.take());
665	–	}
666	–	catch (InterruptedException e) {
667	–	threadFail("should not be interrupted");
668	–	}
669	–	}
670	–	});
671	–
741		joinPool(executor);
673	–
742		}
743
744	+	/**
745	+	* timed poll retrieves elements across Executor threads
746	+	*/
747		public void testPollInExecutor() {
677	–
748		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
749	<
749	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
750		ExecutorService executor = Executors.newFixedThreadPool(2);
751	+	executor.execute(new CheckedRunnable() {
752	+	public void realRun() throws InterruptedException {
753	+	assertNull(q.poll());
754	+	threadsStarted.await();
755	+	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
756	+	checkEmpty(q);
757	+	}});
758	+
759	+	executor.execute(new CheckedRunnable() {
760	+	public void realRun() throws InterruptedException {
761	+	threadsStarted.await();
762	+	q.put(one);
763	+	}});
764
682	–	executor.execute(new Runnable() {
683	–	public void run() {
684	–	threadAssertNull(q.poll());
685	–	try {
686	–	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
687	–	threadAssertTrue(q.isEmpty());
688	–	}
689	–	catch (InterruptedException e) {
690	–	threadFail("should not be interrupted");
691	–	}
692	–	}
693	–	});
694	–
695	–	executor.execute(new Runnable() {
696	–	public void run() {
697	–	try {
698	–	Thread.sleep(SMALL_DELAY_MS);
699	–	q.put(one);
700	–	}
701	–	catch (InterruptedException e) {
702	–	threadFail("should not be interrupted");
703	–	}
704	–	}
705	–	});
706	–
765		joinPool(executor);
766		}
767
768	<	public void testSerialization() {
768	>	/**
769	>	* A deserialized serialized queue has same elements in same order
770	>	*/
771	>	public void testSerialization() throws Exception {
772	>	Queue x = populatedQueue(SIZE);
773	>	Queue y = serialClone(x);
774	>
775	>	assertNotSame(x, y);
776	>	assertEquals(x.size(), y.size());
777	>	assertEquals(x.toString(), y.toString());
778	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
779	>	while (!x.isEmpty()) {
780	>	assertFalse(y.isEmpty());
781	>	assertEquals(x.remove(), y.remove());
782	>	}
783	>	assertTrue(y.isEmpty());
784	>	}
785	>
786	>	/**
787	>	* drainTo(c) empties queue into another collection c
788	>	*/
789	>	public void testDrainTo() {
790		LinkedBlockingQueue q = populatedQueue(SIZE);
791	+	ArrayList l = new ArrayList();
792	+	q.drainTo(l);
793	+	assertEquals(0, q.size());
794	+	assertEquals(SIZE, l.size());
795	+	for (int i = 0; i < SIZE; ++i)
796	+	assertEquals(l.get(i), new Integer(i));
797	+	q.add(zero);
798	+	q.add(one);
799	+	assertFalse(q.isEmpty());
800	+	assertTrue(q.contains(zero));
801	+	assertTrue(q.contains(one));
802	+	l.clear();
803	+	q.drainTo(l);
804	+	assertEquals(0, q.size());
805	+	assertEquals(2, l.size());
806	+	for (int i = 0; i < 2; ++i)
807	+	assertEquals(l.get(i), new Integer(i));
808	+	}
809
810	<	try {
811	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
812	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
813	<	out.writeObject(q);
814	<	out.close();
815	<
816	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
817	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
818	<	LinkedBlockingQueue r = (LinkedBlockingQueue)in.readObject();
819	<	assertEquals(q.size(), r.size());
820	<	while (!q.isEmpty())
821	<	assertEquals(q.remove(), r.remove());
822	<	} catch(Exception e){
823	<	e.printStackTrace();
824	<	fail("unexpected exception");
810	>	/**
811	>	* drainTo empties full queue, unblocking a waiting put.
812	>	*/
813	>	public void testDrainToWithActivePut() throws InterruptedException {
814	>	final LinkedBlockingQueue q = populatedQueue(SIZE);
815	>	Thread t = new Thread(new CheckedRunnable() {
816	>	public void realRun() throws InterruptedException {
817	>	q.put(new Integer(SIZE + 1));
818	>	}});
819	>
820	>	t.start();
821	>	ArrayList l = new ArrayList();
822	>	q.drainTo(l);
823	>	assertTrue(l.size() >= SIZE);
824	>	for (int i = 0; i < SIZE; ++i)
825	>	assertEquals(l.get(i), new Integer(i));
826	>	t.join();
827	>	assertTrue(q.size() + l.size() >= SIZE);
828	>	}
829	>
830	>	/**
831	>	* drainTo(c, n) empties first min(n, size) elements of queue into c
832	>	*/
833	>	public void testDrainToN() {
834	>	LinkedBlockingQueue q = new LinkedBlockingQueue();
835	>	for (int i = 0; i < SIZE + 2; ++i) {
836	>	for (int j = 0; j < SIZE; j++)
837	>	assertTrue(q.offer(new Integer(j)));
838	>	ArrayList l = new ArrayList();
839	>	q.drainTo(l, i);
840	>	int k = (i < SIZE) ? i : SIZE;
841	>	assertEquals(k, l.size());
842	>	assertEquals(SIZE - k, q.size());
843	>	for (int j = 0; j < k; ++j)
844	>	assertEquals(l.get(j), new Integer(j));
845	>	do {} while (q.poll() != null);
846	>	}
847	>	}
848	>
849	>	/**
850	>	* remove(null), contains(null) always return false
851	>	*/
852	>	public void testNeverContainsNull() {
853	>	Collection<?>[] qs = {
854	>	new LinkedBlockingQueue<Object>(),
855	>	populatedQueue(2),
856	>	};
857	>
858	>	for (Collection<?> q : qs) {
859	>	assertFalse(q.contains(null));
860	>	assertFalse(q.remove(null));
861		}
862		}
863

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